СПОСОБ И УСТРОЙСТВО ДЛЯ АКТИВНОГО ПОДАВЛЕНИЯ КОЛЕБАНИЙ ДАВЛЕНИЯ В ГИДРАВЛИЧЕСКОЙ СИСТЕМЕ

... 1. Способ активного подавления колебаний давления в гидравлической системе прокатного стана холодной или горячей прокатки или установке обработки полосы для железных, стальных или алюминиевых материалов, содержащий следующие этапы способа в указанной последовательности:а) определение сигнала давления посредством приемника давления путем непрерывного измерения давления в гидравлической системе;b) определение переменной составляющей сигнала давления;c) определение по меньшей мере одного изменяющегося во времени параметра регулирования в реальном времени с помощью регулятора с учетом по меньшей мере одного заданного значения и переменной составляющей;d) нагружение по меньшей мере одного исполнительного элемента параметром регулирования, причем исполнительный элемент изменяет соответствующий параметру регулирования и связанный с гидравлической системой объем, за счет чего колебания давления в гидравлической системе подавляются.2. Способ по п.1, отличающийся тем, что переменную составляющую ...

Luftleistungsverstärker für einen Antrieb eines Stellventils

Luftleistungsverstärker (10, 38) zum Anschluss an einen fluidischen, insbesondere pneumatischen, Antrieb (32) eines Stellventils (34), wobei der Luftleistungsverstärker (10, 38) einen fluidischen Steuereingang (18, 40) und einen fluidschen Antriebsanschluss (14, 47) aufweist, die über einen Bypasskanal (22) verbunden sind, wobei in dem Bypasskanal (22) ein einstellbares Drosselelement (24) angeordnet ist, das in seiner Öffnungsweite einstellbar ist, dadurch gekennzeichnet, dass das Drosselelement (24) einen Aktor (26) und einen Steuereingang (28, 46) umfasst, wobei der Aktor (26) abhängig vom Steuereingang (28, 46) betrieben wird.

Verfahren zum Ansteuern einer hydraulischen Ventilanordnung

Die Erfindung betrifft zwei Verfahren zum Verlängern des Zeitraums der wirksamen Schließbewegung eines Schaltventils (110, 120) einer Ventilanordnung (100), so dass ein Fluss eines Hydraulikfluids nicht abrupt, sondern allmählich endet. Bei einem Schaltventil (110) wird dies dadurch erreicht, dass der Schließvorgang durch erneutes Ansteuern verlängert wird. Bei zwei Schaltventilen (110, 120) wird dies durch zeitweises gleichzeitiges Öffnen erreicht, da ein gleichzeitiges Öffnen von zwei Schaltventilen in Druck- und Tankleitung in der Wirkung dem Schließen eines Schaltventils in der Druckleitung entspricht.

Fluid flow control valves

... 979,923. Valves. BRATISLAVSKE ELEKTROTECHNICKE ZAVODY, NARODNY PODNIK. April 2, 1962 [April 1, 1961], No. 12517/62. Heading F2V. A pressure relief valve comprises a piston valve member 4 having a portion 3 seating on an inlet 6 under the action of an adjustable spring loading 5. The valve is opened by fluid pressure, first acting on an area d 1 and then on area d 2 to move the valve against an adjustable stop 2. The position of the stop determines the number of passages 7, arranged on a spiral, opened by the valve member.

Ripple damper

A ripple damper 10 for an aircraft hydraulic system comprises a hollow, substantially spherical body 20 formed of first 34 and second 44 body portions, the adjoining surfaces of which are connected at a join line 52 such that the body portions define a substantially spherical fluid chamber. The body further comprises a joining portion 50 extending between first 55 and second 56 spaced apart parallel planes, the join line being intermediate to these parallel planes. The internal diameter of the fluid chamber is constant within the joining portion such that it has a locally cylindrical inner wall 54. The ripple damper is made by assembling together the body sections and attaching them via electron beam welding. The ripple damper is used in an aircraft hydraulic system, and an aircraft structure comprising such a hydraulic system. An alternate aspect of the ripple damper has the damper comprise a hollow, spherical body with a first and second end. A base 46 is disposed at one of the ends of ...

FEEDING PRESSURE MODULATOR FOR HYDRAULICALLY-OPERATED DEVICES

... 1315721 Controlling clutches G CATTANEO 30 Nov 1970 [29 Nov 1969] 56814/70 Heading F2L [Also in Division F1] To provide gradual engagement of an hydraulically actuated fuction clutch H, a pump A delivers to the engaging chamber 52 of the clutch via a throttle valve 24 and a valve bypass path formed by a circumferential groove 30 in a piston 14. Initally, an operating valve D to initiate clutch engagement, the hydraulic fluid flows rapidly through the open throttle valve 26 and the groove 30 to fill the engaging chamber 52. Further increase in pressure in the chamber to take up play in the clutch plates is effected gradually, the pressure increase acting to move piston 14 up against its spring 16 to cut-off flow through grooves 30 so that the pressure difference across valve 24 moves it against its seat 28, flow taking place through its calibrated opening 26 to complete clutch engagement. Again, Fig. 2 (not shown), the controls are duplicated for two clutches, the pair of pistons (14a), ...

Hydraulic systems

Method for semi-active reduction of pressure oscillation in hydraulic system of e.g. cold rolling train, involves subjecting actuator to variable, where actuator varies natural frequency of oscillation absorber

The method involves detecting a pressure signal (2) using a pressure sensor (1) by permanent measurement of pressure in a hydraulic system (10). An alternating component of the pressure signal is determined and subject to a band pass filter. A variable (6) that changes over time is determined in real time using a controller (4) with respect to the alternating component. An actuator (9) is subject to the variable, where the actuator varies a natural frequency of an oscillation absorber (13) connected to the hydraulic system. An independent claim is also included for a device for semi-active reduction of pressure oscillation in a hydraulic system of a cold or warm rolling train or a strip conditioning installation for iron, steel or aluminum materials.

Pressure oscillations or pressure pulsations suppressing method for use in hydraulic system of e.g. cold-or warm-roller, involves subjecting piezoelectric actuator to variable, where actuator is connected with hydraulic system

The method involves detecting a pressure signal (2) by a pressure sensor (1) in a hydraulic system. Alternating component of the pressure signal is determined, and a variable (6) that changes over time is determined by a controller (4) with respect to a nominal value and the alternating component. Piezoelectric actuator (9') is subjected to the variable such that volume of the actuator is changed corresponding to the variable, where the actuator is connected with the hydraulic system. High-or low pass filtering process is carried out by the alternating current component. An independent claim is also included for a device for actively suppressing pressure oscillations or pressure pulsations in a hydraulic system of a cold- or warm-roller or a strip conditioner for iron, steel or aluminum materials, comprising a controlling unit.

HYDRAULIC CONTROL DEVICE.

CONTROL VALVE UNIT FOR A HYDRAULIC ELEVATOR

Two-stage, rushing over automatic controllers for determining two following each other operating pressures in hydraulically propelled machines, in particular hydraulic welding presses for electrical resistance welding, working with a piston slide

High speed pneumatic servo actuator

SYSTEM FOR CONTROLLING THE OPERATION OF AN ACTUATOR MOUNTED ON A SEED PLANTING IMPLEMENT

In one aspect, a system for controlling an operation of an actuator mounted on a seed planting implement may include an actuator configured to adjust a position of a row unit of the seed planting implement relative to a toolbar of the seed planting implement. The system may also include a flow restrictor fluidly coupled to a fluid chamber of the actuator, with the flow restrictor being configured to reduce a rate at which fluid is permitted to exit the fluid chamber in a manner that provides damping to the row unit. Furthermore, the system may include a valve fluidly coupled to the flow restrictor in a parallel relationship such that the valve is configured to permit the fluid exiting the fluid chamber to flow through the flow restrictor and the fluid entering the fluid chamber to bypass the flow restrictor.

HYDRAULIC SYSTEM

HYDRAULIC SYSTEM

The invention concerns a hydraulic system (1) with a pressure source (2, 3) controllable via a load sensing signal, a pressure sink (4), at least two working sections (6, 7), each having a hydraulic consumer (8, 18) and a control valve (9, 9') with a load sensing signal connection (19, 20; 19', 20') and at least one back-pressure valve (17) arranged in a tank pipe between the control valve (9, 9'9 and the pressure sink (4). In such a system the pressure required from the pump in the neutral position must be as low as possible. On the other hand, however, oscillations should not occur, when an external force acts on another hydraulic consumer in the neutral position of a control valve. In the neutral position of the control valves (9, 9') the load sensing signal connection ( 19, 20; 19' 20') is therefore connected with the pressure sink (4) via an auxiliary tank pipe (23, 23', 23"; 29) by-passing the back-pressure valve (17).

Regelvorrichtung zum Festlegen zweier nachfolgender Drücke in hydraulisch angetriebenen Maschinen, insbesondere Maschinen für hydraulische Schweisspressung bei elektrischer Widerstandsschweissung

Hydraulische Hebeanlage, insbesondere für Fahrzeuge

Installation de traction d'un car à lingot

Control valve unit for a hydraulic elevator.

DISCHARGE PRESSURE SCALE AND LIFTING-LOWERING DEVICE HAVING A DISCHARGE PRESSURE SCALE OF THIS TYPE

Hydraulic control circuit for lifting jack, has valve releasing system exhausting liquids outside of one of chambers when distributor is closed, where sudden increasing of pressure is produced in chambers by rebound phenomenon

The circuit has an energy accumulator (6) e.g. hydropneumatic shock absorber, connected to ducts (4, 5) supplying a large chamber (10) of a dual control lifting jack (1). A valve releasing system (8) e.g. non return control valve, is used for exhausting small volume of hydraulic liquid outside of a chamber (11) when a distributor (V) is closed, where sudden increasing of pressure is produced in the chambers by rebound phenomenon after collision. The valve releasing system restores the small volume of hydraulic liquid to a reservoir (R).

Load-sensing and pressure-limiting device with accelerated tripping

METHOD FOR OPERATING A HYDRAULIC DEVICE WITH PUMP AND SERVOMOTOR, AND ASSOCIATED HYDRAULIC DEVICE

In a method for operating a hydraulic device for providing a supply to hydraulic consumers (V) on a plastics injection moulding machine, provision is made of a pump (10) with a volumetric delivery characteristic that results in cyclic pulsations and of a servomotor (11) with multiple poles that result in cyclic pulsations. The pressure at the hydraulic consumer (V) is detected and is input as an actual value into a pressure regulator (13) that readjusts the servomotor (11), on the basis of a predefined pressure profile, to a pressure setpoint value at the hydraulic consumer (V). The cyclic pressure pulsation is minimized in that, by means of a rotational angle sensor (20), the rotational angle (φ) of the pump (10) and/or of the servomotor (11) is detected and correlated with the cyclic pulsations, and in that, from this, a corrective value or a corrective function is determined and is transmitted to the pressure regulator (13) with control subordinate to the regulation of the pressure setpoint ...

Hydraulic control device

In the case of a hydraulic control device for an oscillating load moving system comprising a double-acting hydroconsumer (V), which is adapted to be selectively connected to a pressure source (P) or to a reservoir (T) via two separate main lines (9, 10) and a control valve (C), and further comprising a load supporting valve (H), which is arranged in at least one main line (10) between the control valve (C) and the hydroconsumer (V) and which is adapted to be opened from the other main line (9) via a pilot line (16), a damping device (X), which consists of a bypass line (23) and an interference throttle aperture (D2), is connected to the pilot line (16) of the load supporting valve (H). The pilot line (16) has provided therein a throttle aperture (D1) which is smaller than the interference throttle aperture (D2).

DRUCKABHÄNGIGES SPERRVENTIL UND HYDRAULIKSYSTEM MIT EINEM SOLCHEN

Ablaufdruckwaage und Hub-Senkvorrichtung mit einer solchen Ablaufdruckwaage

Ablaufdruckwaage und Hub-Senkvorrichtung mit einer solchen Ablaufdruckwaage.

UEberdruckventil fuer hydraulische Anlagen, insbesondere fuer Kraftheber an Fahrzeugen

Ventil einschließlich Ventilvorrichtung mit einem solchen Ventil

Eine Ventil mit einem Ventilgehäuse (33), das mindestens einen Nutzanschluss (A, B), einen Druckversorgungsanschluss (P) und einen Rücklaufanschluss (T) aufweist und in dem zum Ansteuern dieser einzelnen Anschlüsse längsverfahrbar ein Steuerschieber (STS) geführt ist, ist dadurch gekennzeichnet, dass der am Druckversorgungsanschluss (P) anstehende Versorgungsdruck zum Ansteuern eines an den jeweiligen Nutzanschluss (A; B) angeschlossenen Verbrauchers (10, 12) über eine Blendeneinrichtung (54) und einen Steuerkanal (50) auf zumindest eine Ansteuerseite (56) des Steuerschiebers (STS) geführt ist, die in einem Ansteuerraum (58) im Ventilgehäuse (33) verfahrbar angeordnet ist, der über eine weitere Blendeneinrichtung (59) an den Rücklaufanschluss (T) angeschlossen ist.

Ripple damper

Improvements in or relating to hydraulic servo-devices

... 895,497. Fluid-pressure servomotor-control systems; valves. LEDUC, R. July 27, 1960 [July 27, 1959], No. 26081/60. Class 135. [Also in Group XXXIV] A valve assembly for controlling a spring- loaded servopiston 13, Fig. 2, comprises an input member 4 movable relatively to a valve member 23 whereby to interrupt communication between a chamber 2a and an exhaust passage 10, 9 and to open communication between an inlet 11 for pressure liquid and the chamber 2a. The pressure in the chamber 2a reacts on the member 4 so that the force exerted by the servopiston 13, which is connected through an annular restriction 5 with the chamber 2a, is proportional to the effort applied to the member 4. Due to the restriction 5 the rate of flow of liquid to the servopiston is dependent upon the " error " between the instantaneous value and the required or final value of the pressure acting on the servopiston whereby the final pressure is attained in a damped and stable manner. The restriction 5 may alternatively ...

ELECTROHYDRAULICAL STROKE MODULE

PRESSURE-DEPENDENT NON-RETURN VALVE AND HYDRAULIC SYSTEM WITH SUCH

HYDRAULIC CONTROL DEVICE.

HYDRAULIC SYSTEM FOR TURNING CRANE ON TRUCK AND ARM OF EXCAVATORS AND THE ASSOCIATED METHOD

Boom-holding control device for use in heavy construction equipments

A boom-holding control device brings an excavator boom into a holding condition or a release condition. The device includes a boom-holding valve provided on a fluid pressure line for preventing boom deadweight-caused drainage of a hydraulic flow from a boom cylinder to thereby keep a boom in a holding condition, a boom release valve for releasing the boom from the holding condition in response to at least one of a boom-down pilot signal pressure supplied from a boom cylinder remote control valve and a travel signal pressure fed from a travel control operator-interface device and a solenoid-actuated changeover valve provided on a travel signal line for selectively opening and blocking off the travel signal line. The changeover valve is normally kept in a closing position and will be shifted to an opening position at the time of simultaneous activation of a travel selection switch and a boom release switch.

Controlled hydraulic device

Controlled hydraulic device

HYDRAULIC CONTROL CIRCUIT Of a HYDRAULIC JACK HAS DOUBLE EFFECT

DEVICE HAS HYDRAULIC VALVES

Dans ce dispositif (1) à vannes comportant un dispositif de raccordement d'alimentation comportant un raccord haute pression (P) et un raccord basse pression (T), un dispositif de raccordement de travail comportant deux raccords de travail (A, B) reliés à un moteur (2), une vanne de commande de direction (4) située entre les dispositifs (P, T; A, B) et une vanne de compensation (8) chargée par un ressort (22) et par la pression régnant dans une chambre (23) d'une canalisation (LS), dans un premier sens d'actionnement, et chargée par une pression présente dans la vanne de commande de direction (4), dans une seconde direction d'actionnement, la vanne de compensation (8) possède un dispositif (25) qui agit sur l'ouverture. Application notamment à la commande d'un moteur de pelle mécanique.

HYDRAULIC DAMPER

... par.

METHOD AND DEVICE FOR ACTIVELY SUPPRESSING PRESSURE OSCILLATIONS IN A HYDRAULIC SYSTEM

The invention relates to a method and a device for actively suppressing pressure oscillations or pressure pulsations in a hydraulic system of a cold- or warm-rolling train or a strip conditioning installation for iron, steel or aluminum materials. The aim of the invention is to provide a method and a device for actively suppressing pressure oscillations or pressure pulsations in a hydraulic system of a cold- or warm-rolling train or a strip conditioning installation whereby occurring pressure oscillations or pressure pulsations can be suppressed in a particularly effective manner by means of a simple and cost-effective device. This aim is achieved by a method comprising the following method steps: a) detecting a pressure signal by means of a pressure sensor through permanent pressure measurement in the hydraulic system; b) determining an alternating component of the pressure signal; c) determining in real time at least one variable which changes over time with the aid of a controller while ...

Hydraulic system for working machine

A hydraulic system for a working machine includes a hydraulic actuator having a first fluid chamber and a second fluid chamber, an accumulator, an outputting fluid tube to output an operation fluid, and a switching valve to be switched between a first position and a second position. The first position allows the first fluid chamber and the second fluid chamber to be communicated with the outputting fluid tube and thereby allowing a floating operation. The second position allows the first fluid chamber and the accumulator to be communicated with each other, allows the second fluid chamber and the outputting fluid tube to be communicated with each other, and thereby allows an anti-vibration operation.

METHOD AND DEVICE FOR THE SEMI-ACTIVE REDUCTION OF PRESSURE OSCILLATIONS IN A HYDRAULIC SYSTEM

БЛОК РАСПРЕДЕЛИТЕЛЬНЫХ КЛАПАНОВ ЛИФТА С ГИДРАВЛИЧЕСКИМ ПРИВОДОМ

Блок распределительных клапанов предназначен для управления подъемом и опусканием кабины лифта с гидравлическим приводом. Блок состоит из двух распределительных клапанов, с помощью которых регулируют поток масла для гидравлической системы, поступающий из бака в подъемный цилиндр, приводящий в действие кабину лифта, и/или из упомянутого подъемного цилиндра в упомянутый бак. При движении вверх упомянутой кабины лифта масло для гидравлической системы с помощью насоса, приводимого в действие электродвигателем, подается из упомянутого бака через упомянутый блок распределительных клапанов в упомянутый подъемный цилиндр. При движении вниз упомянутой кабины лифта упомянутое масло для гидравлической системы через упомянутый блок распределительных клапанов поступает в резервуар, насос при этом не работает. В соответствии с настоящим изобретением для управления движением вверх и вниз упомянутой кабины лифта в упомянутом блоке распределительных клапанов предусмотрен один единый управляемый распределительный ...

СПОСОБ И УСТРОЙСТВО (ВАРИАНТЫ) ДЛЯ СТАБИЛИЗАЦИИ ПОЗИЦИОНЕРА КЛАПАНА ВО ВРЕМЯ ИСПЫТАНИЙ ЭЛЕКТРОМАГНИТНОГО КЛАПАНА

FIELD: solenoid valves. SUBSTANCE: invention relates to solenoid valves, and in particular to methods and devices for stabilizing the valve positioner during tests of the solenoid valve. A typical device comprises a solenoid valve (202) and a valve positioner (106), connected with the data transmission capability and in hydraulic communication with the solenoid valve. The valve positioner must be set to the pressure control state before testing the solenoid valve. The valve positioner must detect the pressure change at the opposite ends of the solenoid valve caused by the transition of the solenoid valve from the first state to the second state, and switch from the pressure control state to the saturated state after detecting the specified pressure change. The full discharge pressure should stabilize the positioner of the valve conducting the solenoid valve test. The valve positioner must maintain a saturated state until the pressure at the opposite ends of the solenoid valve returns to a pre-determined initial value. EFFECT: proposed inventions make it possible to test a solenoid valve that controls the activation of an emergency valve by means of a positioner independently of the tests of the emergency valve. 20 cl, 11 dwg РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (51) МПК F15B 19/00 F15B 20/00 F16K 37/00 F16K 31/10 (11) (13) 2 752 213 C2 (2006.01) (2006.01) (2006.01) (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (52) СПК F15B 19/005 (2020.08); F15B 20/008 (2020.08); F16K 37/0091 (2020.08); F16K 31/10 (2020.08) (21)(22) Заявка: 2019114058, 04.10.2017 (24) Дата начала отсчета срока действия патента: (73) Патентообладатель(и): ФИШЕР КОНТРОЛЗ ИНТЕРНЕШНЕЛ ЛЛС (US) Дата регистрации: 23.07.2021 20.10.2016 US 15/298,717 (43) Дата публикации заявки: 20.11.2020 Бюл. № 32 (56) Список документов, цитированных в отчете о поиске: EP 2463562 A1, 13.06.2012. EP 2321563 A1, 18.05.2011. WO 2014197422 A1, 11.12.2014. SU 1645672 A1, 30.04.1991 ...

СПОСОБЫ И УСТРОЙСТВА СТАБИЛИЗАЦИИ ПОЗИЦИОНЕРА КЛАПАНА ВО ВРЕМЯ ИСПЫТАНИЙ ЭЛЕКТРОМАГНИТНОГО КЛАПАНА

РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2019 114 058 A (51) МПК F15B 13/04 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ЗАЯВКА НА ИЗОБРЕТЕНИЕ (21)(22) Заявка: 2019114058, 04.10.2017 (71) Заявитель(и): ФИШЕР КОНТРОЛЗ ИНТЕРНЕШНЕЛ ЛЛС (US) Приоритет(ы): (30) Конвенционный приоритет: 20.10.2016 US 15/298,717 (85) Дата начала рассмотрения заявки PCT на национальной фазе: 20.05.2019 R U (43) Дата публикации заявки: 20.11.2020 Бюл. № 32 (72) Автор(ы): ДЖАНК, Кеннет, В. (US), ДЖЕЛКЕН, Шэннон, Е. (US) (86) Заявка PCT: (87) Публикация заявки PCT: WO 2018/075241 (26.04.2018) R U (54) СПОСОБЫ И УСТРОЙСТВА СТАБИЛИЗАЦИИ ПОЗИЦИОНЕРА КЛАПАНА ВО ВРЕМЯ ИСПЫТАНИЙ ЭЛЕКТРОМАГНИТНОГО КЛАПАНА (57) Формула изобретения 1. Устройство, содержащее: электромагнитный клапан, позволяющий исполнительному механизму закрывать аварийный клапан; и позиционер клапана, имеющий гидравлическое сообщение и соединение с возможностью передачи данных с указанным электромагнитным клапаном, причем позиционер клапана: установлен в состояние управления давлением, чтобы поддерживать предварительно определенное начальное значение давления на входе электромагнитного клапана до проведения испытания электромагнитного клапана; обнаруживает изменение давления на противоположных концах электромагнитного клапана, вызванное переходом электромагнитного клапана из первого состояния во второе состояние; переходит из состояния управления давлением в насыщенное состояние, во время которого позиционер клапана подает полное давление нагнетания, стабилизирующее позиционер клапана после перехода электромагнитного клапана из первого состояния во второе состояние для проведения испытания электромагнитного клапана; и поддерживает насыщенное состояние, пока давление на противоположных концах электромагнитного клапана не вернется к предварительно определенному начальному значению. Стр.: 1 A 2 0 1 9 1 1 4 0 5 8 A Адрес для переписки: 197101, Санкт-Петербург, а/я 128, "АРСПАТЕНТ" 2 0 1 9 1 1 4 0 5 8 US 2017/055124 ( ...

Hydrauliksystem zur Bewegung eines Flugzeugruders

Die Erfindung betrifft ein Hydrauliksystem zur Bewegung eines Ruders eines Flugzeugs, umfassend ein Servoventil, einen doppelwirkenden Ruderaktuator mit zwei Aktuatorkammern, zwei vom Servoventil zu den Aktuatorkammern führende Arbeitsleitungen und ein an den Arbeitsleitungen angeordnetes Funktionsschaltventil mit einem Ventilgehäuse und einem darin beweglich angeordneten Ventilkörper, wobei das Funktionsschaltventil drei Schaltstellungen umfasst, wobei in einer ersten Schaltstellung des Funktionsschaltventils die Aktuatorkammern operativ mit dem Servoventil verbunden sind und wobei in einer zweiten und einer dritten Schaltstellung des Funktionsschaltventils die beiden Aktuatorkammern vom Servoventil getrennt und kurzgeschlossen sind. Die Erfindung betrifft ferner ein Flugzeug umfassend ein Ruder und ein derartiges Hydrauliksystem.

Vorrichtung zum Reduzieren und Vergleichmäßigen des Drucks eines viskosen Mediums

Vorrichtung zum Reduzieren und Vergleichmäßigen des Drucks eines viskosen Mediums mit einem rohrförmigen Körper (1), der an einem Ende von einem ersten Flansch (2) und an seinem anderen Ende von einem zweiten Flansch (3) abgeschlossen ist und einen in dem rohrförmigen Körper (1) fliegend gelagerten Kolben (4), der auf seiner einen Seite einen mit einem Präzisionsdruckregler (8) kommunizierenden Pneumatikraum (15) und auf seiner anderen Seite einen mit einem Einlass (12) und einem Auslass (13) kommunizierenden Medienraum (14) begrenzt, und eine in der Zuwegung zu dem Einlass (12) angeordnete, mit einem Stellantrieb (10) versehene Absperrarmatur (9), wobei der erste Flansch (2) mit einem ersten pneumatischen 2/3-Wegeventil (6) versehen ist, dessen Betätigungsstößel (7) in den Pneumatikraum (15) ragt und bei Betätigung durch den Kolben (4) ein Sperren der Absperrarmatur (9) bewirkt, und der zweite Flansch (3) mit einem zweiten pneumatischen 2/3-Wegeventil versehen ist, dessen Betätigungsstößel ...

Druckmitteleinspeisung für einen hydrostatischen Antrieb

Offenbart ist eine Druckmitteleinspeisung für einen hydrostatischen Antrieb mit einer Hydropumpe, einem davon fluidisch antreibbaren Hydromotor, und einem Speiseanschluss über den der Hydromotor zur Vermeidung von Kavitation von einem Druckspeicher mit Druckmittel versorgbar ist. Erfindungsgemäß ist ein Mehrwege-Schieberventil zur Steuerung einer Antriebsrichtung des Hydromotors vorgesehen. Weiter erfindungsgemäß ist der Druckspeicher zwischen einem von einem Druck in dem Druckspeicher schließbaren Ventil und dem Speiseanschluss angeordnet.

Hydraulikkreis für Drehkrane auf Lastkraftwagen und Ausleger von Baggern und die zugehörige Methode

Hydraulikbagger

Geschaffen wird ein Hydraulikbagger, bei dem Eindringen einer Arbeitsausrüstung in eine Soll-Oberfläche verhindert werden kann. Ein Proportional-Magnetventil zum Absenken eines Auslegers ist in einer Vorsteuer-Leitung zum Absenken des Auslegers vorhanden, die mit einem Vorsteuer-Anschluss zum Absenken des Auslegers verbunden ist. Ein erster Druck-Sensor erfasst einen in der Vorsteuer-Leitung zum Absenken des Auslegers zwischen einem Bedienhebel und dem Proportional-Magnetventil zum Absenken des Auslegers erzeugten Druck. Eine Steuereinrichtung steuert einen Öffnungsgrad des Proportional-Magnetventils zum Absenken des Auslegers auf Basis des durch den ersten Druck-Sensor erfassten Drucks. Die Steuereinrichtung erhöht einen an das Proportional-Magnetventil zum Absenken des Auslegers ausgegebenen Stromwert allmählich von Null ausgehend. What is provided is a hydraulic excavator in which the penetration of work equipment into a desired surface can be prevented. A proportional solenoid valve for lowering a boom is provided in a booster for lowering the boom, which is connected to a pilot control port for lowering the boom. A first pressure sensor detects a pressure generated in the pilot line for lowering the boom between a control lever and the proportional solenoid valve for lowering the boom. A controller controls an opening degree of the proportional solenoid valve for lowering the boom based on the pressure detected by the first pressure sensor. The controller gradually increases a current value output from the proportional solenoid valve for lowering the boom from zero.

Hydraulic damper

Influencing compensation valve opening in hydraulic valve arrangement

A hydraulic valve arrangement 1 comprising a supply connection arrangement having a high P and a low-pressure connection T, a work connection arrangement having two work connections A, B connectible to a motor 2, a directional valve 4, between the supply and the work connection arrangements and a compensation valve 8 acted upon in a first direction by a spring 22 and a pressure in a pressure chamber 23 connected to a load-sensing line LS, and in a second operation direction, opposite to the first, by a pressure at the directional valve. To reduce the tendency to oscillate the compensation valve has an opening influencing device 25 comprising a throttle 26 between the load-sensing line and the pressure chamber to slow the valve opening to a ramp-like characteristic. Rapid closure is permitted by check valve 28 connecting compensation valve outlet 9 and the throttle downstream side.

Hydraulic damper

Transmission system

HYDRAULIC CONTROL DEVICE.

HYDRAULIC CONTROL DEVICE AND TWO-WAY REGULATING VALVE

LASTERFASSUNGS- UND DRUCKBEGRENZUNGSORGAN MIT BESCHLEUNIGTER AUSLOSUNG

HYDRAULISCHES SYSTEM

HYDRAULISCHES SYSTEM

LIQUID SYSTEM AND OPERATING PROCEDURE FOR IT

HYDRAULIC CONTROL CIRCUIT FOR POWER STEERING AND MOTOR VEHICLE THEREBY

VERFAHREN UND VORRICHTUNG ZUR AKTIVEN UNTERDRÜCKUNG VON DRUCKSCHWINGUNGEN IN EINEM HYDRAULIKSYSTEM

HYDRAULIC DAMPER

A hydraulic damper is disclosed for reducing undesirable pressure differentials in a hydraulic system. the damper comprises a body assembly, including first and second inlet ports for connecting the damper to a hydrau lic system. A pair of lap assemblies are provided for equalizing pressure differentials between the inlet ports. Each lap assembly is in fluid communication with each of said inlet ports. A metered passageway is provided for fluidly connecting each of said inlet ports. A slide is movably received within the lap assembly to permit reciprocal motion. The slide alternately blocks and unblocks the metered passageway in response to a predetermined pressure across one of the respective inlet ports, in order to equalize the pressure differential between the ports.

For the motor of the vehicle with the control line of the core of the valve

Load-sensing and pressure-limiting device with accelerated tripping

HEAVE COMPENSATOR

HYDRAULIC SYSTEM

L'invention concerne un système hydraulique. Dans ce système hydraulique (1) comportant une source de pression (2, 3) commandable par un signal de détection de charge, un dispositif d'absorption de pression (4), au moins deux sections de travail (6, 7) comportant un appareil d'utilisation hydraulique (8, 18) et une soupape de commande (9, 9') pourvue d'un raccord (19, 20; 19', 20') pour le signal de détection de charge et une soupape de contre-pression (17) disposée dans une canalisation entre la soupape de commande et le dispositif (4), le raccord (19, 20; 19', 20') est connecté au dispositif (4) par une canalisation auxiliaire (23, 23', 23"; 29) contournant la soupape de contre-pression (17), lorsque la soupape de commande (9, 9') est dans sa position neutre. Application notamment aux systèmes hydrauliques comportant une pompe formant source de pression. The invention relates to a hydraulic system. In this hydraulic system (1) comprising a pressure source (2, 3) controllable by a load detection signal, a pressure absorption device (4), at least two working sections (6, 7) comprising a hydraulic operating device (8, 18) and a control valve (9, 9 ') provided with a connection (19, 20; 19', 20 ') for the load detection signal and a counter valve pressure (17) disposed in a pipe between the control valve and the device (4), the connection (19, 20; 19 ', 20') is connected to the device (4) by an auxiliary pipe (23, 23 ', 23 "; 29) bypassing the back pressure valve (17), when the control valve (9, 9 ') is in its neutral position. Application in particular to hydraulic systems comprising a pump forming a pressure source.

Patent FR1584117A

HYDRAULIC SYSTEM Of ACTUATION OF DIRECTION ASSISTEE AND MOTOR VEHICLE PROVIDED WITH THIS ONE.

L'invention concerne un circuit hydraulique d'actionnement de direction assistée pour véhicule automobile, comportant une valve (9) distributrice de fluide hydraulique, comportant des accès (91, 92) d'alimentation en fluide hydraulique reliés à une pompe (10) par des lignes (11, 12). Suivant l'invention, un moyen (20) de restriction de section de passage de fluide hydraulique de la pompe (10) vers l'accès (92) est prévu sur la ligne haute pression (11).

CYLINDER APPARATUS

HYDRAULIC SYSTEM HAVING A PRESSURE COMPENSATOR

A hydraulic system (22) having a source (24) of pressurized fluid, a fluid actuator (16) with a first chamber (50) and a second chamber (52), and a body (90). The body has a first valve (26) configured to selectively fluidly communicate the source with the first chamber and a second valve (30) configured to selectively fluidly communicate the source with the second chamber. The body also has a proportional pressure compensating valve (36) to control a pressure of fluid directed between the source and the first and second valves and a supply passageway (61) disposed between the source and the first and second valves in parallel and the proportional pressure compensating valve is disposed within the supply passageway.

DAMPENING APPARATUS

Dampening means (14, 18) for a tool (3), the dampening means (14, 18) controlling pivoting of the tool (3) with respect to a support means of a support structure (10).

Hydraulic damper

A hydraulic damper is disclosed for reducing undesirable pressure differentials in a hydraulic system. The damper comprises a body assembly, including first and second inlet ports for connecting the damper to a hydraulic system. A pair of lap assemblies are provided for equalizing pressure differentials between the inlet ports. Each lap assembly is in fluid communication with each of said inlet ports. A metered passageway is provided for fluidly connecting each of said inlet ports. A slide is movably received within the lap assembly to permit reciprocal motion. The slide alternately blocks and unblocks the metered passageway in response to a predetermined pressure across one of the respective inlet ports, in order to equalize the pressure differential between the ports.

Control method and system for using a pair of independent hydraulic metering valves to reduce boom oscillations

A hydraulic system (600) and method for reducing boom dynamics of a boom (30), while providing counter-balance valve protection, includes a hydraulic cylinder (110), first and second counter-balance valves (300, 400), and first and second control valves (700, 800). A net load (90) is supported by a first chamber (116, 118) of the hydraulic cylinder, and a second chamber (118, 116) of the hydraulic cylinder may receive fluctuating hydraulic fluid flow from the second control valve to produce a vibratory response (950) that counters environmental vibrations (960) on the boom. The first control valve may apply a holding pressure and thereby hold the first counter-balance valve closed and the second counter-balance valve open.

СПОСОБ И УСТРОЙСТВО ДЛЯ ПОЛУАКТИВНОГО УМЕНЬШЕНИЯ КОЛЕБАНИЙ ДАВЛЕНИЯ В ГИДРАВЛИЧЕСКОЙ СИСТЕМЕ

FIELD: process engineering. SUBSTANCE: set of inventions relates to semi-active suppression of pressure oscillations in hydraulic system of cold- or hot-rolling mill or strip processing unit for iron, steel or aluminium materials. Proposed process comprises detection of pressure signal by pressure transducer vi pressure measurement in hydraulic system. Variable pressure signal component is defined. At least one time-variable control effect is defined in real time with the help of controller with due allowance for variable component. Said control effect is fed to at least one actuator, the latter varying intrinsic frequency of oscillation killer connected with hydraulic system. EFFECT: decreased pressure oscillation amplitude. 12 cl, 4 dwg РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (51) МПК B21B 37/00 (13) 2 527 496 C2 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ (21)(22) Заявка: ИЗОБРЕТЕНИЯ К ПАТЕНТУ 2011127440/02, 30.11.2009 (24) Дата начала отсчета срока действия патента: 30.11.2009 (72) Автор(ы): ПИРКО,Антон (AT), КАЙНТЦЕЛЬ,Георг (AT) 05.12.2008 AT A1896/2008 (43) Дата публикации заявки: 10.01.2013 Бюл. № 1 R U (73) Патентообладатель(и): СИМЕНС ФАИ МЕТАЛЗ ТЕКНОЛОДЖИЗ ГМБХ (AT) Приоритет(ы): (30) Конвенционный приоритет: (45) Опубликовано: 10.09.2014 Бюл. № 25 A2, 15.09.2004. SU 1507467 A1, 15.09.2004. JP 03179501 A, 05.08.1991. DE 4302977 A1, 31.03.1994. EP 0370718 A2, 01.08.1990 (85) Дата начала рассмотрения заявки PCT на национальной фазе: 05.07.2011 2 5 2 7 4 9 6 (56) Список документов, цитированных в отчете о поиске: RU 2117204 C1, 10.08.1998. EP 1457274 2 5 2 7 4 9 6 R U EP 2009/066020 (30.11.2009) C 2 C 2 (86) Заявка PCT: (87) Публикация заявки PCT: WO 2010/063664 (10.06.2010) Адрес для переписки: 129090, Москва, ул. Б.Спасская, 25, стр. 3, ООО "Юридическая фирма Городисский и Партнеры", пат.пов. С.Р.Абубакирову, рег.N 931 (54) СПОСОБ И УСТРОЙСТВО ДЛЯ ПОЛУАКТИВНОГО УМЕНЬШЕНИЯ КОЛЕБАНИЙ ДАВЛЕНИЯ В ГИДРАВЛИЧЕСКОЙ СИСТЕМЕ (57) Реферат: ...

Hydraulische Lenkanlage für Nutzfahrzeuge

Hydraulikbagger

Hydraulikbagger (1), der umfasst:einen Ausleger (6);einen Löffel (8) mit einer Schneidkante (8a);ein Vorsteuer-Umschaltventil (37) für den Ausleger (6), das einen Vorsteuer-Anschluss (p2) zum Absenken des Auslegers (6) und zum Steuern des Betriebes des Auslegers (6) aufweist;eine Vorsteuer-Leitung (53) zum Absenken des Auslegers (6), die mit dem Vorsteuer-Anschluss (p2) zum Absenken des Auslegers verbunden ist;ein Proportional-Magnetventil (73) zum Absenken des Auslegers (6), das in der Vorsteuer-Leitung (53) zum Absenken des Auslegers (6) vorhanden ist;einen Bedienhebel (44), der von einer Bedienungsperson betätigt wird;einen ersten Druck-Sensor (63), der einen in der Vorsteuer-Leitung (53) zum Absenken des Auslegers (6) zwischen dem Bedienhebel (44) und dem Proportional-Magnetventil (73) zum Absenken des Auslegers (6) erzeugten Druck erfasst; undeine Steuereinrichtung (20), die auf Basis des durch den Druck-Sensor (63) erfassten Drucks einen Öffnungsgrad des Proportional-Magnetventils ...

IMPROVEMENTS IN AND RELATING TO A SYSTEM FOR CONTROLLING A TENSIONING CARRIAGE FOR A TRACTION CABLE FOR AN INGOT TRUCK

... 1,205,196. Tensioning cable of rope railways. SOC. DES FORGES ET ATELIERS DU CREUSOT. 1 April, 1969 [6 May, 1968], No. 17060/69. Heading B7L. A control system for a tensioning carriage 5, Fig. 1, for a traction cable 2 for an ingot truck 1 comprises an hydraulic ram whose cylinder 6 and piston 7 are respectively connectable to a fixed part of the installation and to the tensioning carriage 5, one of the two ram chambers 11 communicating with a pressure circuit, and the other chamber 20 communicating with a liquid tank 16 each connection being via a conduit 12, 21, containing a valve 24, 25 which opens completely to supply liquid to the corresponding chamber and closes partially to allow liquid to escape from said chamber, means being provided to limit the rate of escape of the liquid. The cable 2 passes over a drive pulley 3 and a pulley 4 mounted on the tensioning carriage 5. The piston 7 is attached to the carriage 5 by means of a pistonrod 8 and a link 9 having a number of apertures ...

Ripple damper

A ripple damper (10) for an aircraft hydraulic system is disclosed. The ripple damper (10) comprises a hollow, substantially spherical body (20) formed of first (34) and second (36) body portions the adjoining surfaces of which are connected at a join line (52) such that the body portions cooperatively define a substantially spherical fluid chamber (24). The body (20) further comprises a joining portion (50), the joining portion extending between first and second spaced apart parallel planes, the join line (52) being intermediate to said parallel planes. The internal diameter of the substantially spherical fluid chamber (24) is constant within the joining portion (52) such that the joining portion (52) has a locally cylindrical inner wall (54).

Comfort damper

Ripple damper

Hydraulic system

The hydraulic system according to the present invention is provided with a regulator for adjusting the tilt angle of a pump, and a control device for controlling the regulator so that the discharge flow rate of the pump is equal to the lesser of an operation required flow rate and a horsepower control flow rate, a first horsepower control line and a second horsepower control line lower than the first horsepower control line being stored in the control device, the control device reducing the tilt angle of the pump when a working point exceeds the first horsepower control line in a case in which an operation signal outputted from an operation device is increased and the operation required flow rate is greater than the horsepower control flow rate, the control device increasing the tilt angle of the pump when the working point falls below the second horsepower control line, and the control device maintaining the tilt angle of the pump when a working point that exceeds the first horsepower ...

HYDROMECHANICAL FILTER VALVE AND LS TAX ARRANGEMENT

LASTERFASSUNGSUND PRESSURE CONTROL ORGAN WITH ACCELERATED DRAWING

HYDRAULIC SYSTEM

LASTERFASSUNGSUND PRESSURE CONTROL ORGAN WITH ACCELERATED DRAWING

VERFAHREN UND VORRICHTUNG ZUR SEMI-AKTIVEN REDUKTION VON DRUCKSCHWINGUNGEN IN EINEM HYDRAULIKSYSTEM

Valve control unit for a hydraulic elevator

CONTROL MEANS FOR A HYDRAULIC SERVOMOTOR

Control means for a hydraulic servomotor comprise a series circuit of two magnetic valves (10, 13; 11, 12) in series. The one magnetic valve (12, 13) is normally open and is operated to the closed condition by control pulses (C12, C13) of a first train of pulses. The other magnetic valve (10, 11) is normally closed and is operated to the open condition by the control pulses (C10, C11) of a second pulse train. In this way, one obtains good resolution and certainty of operation.

ACTUATOR UNIT

This actuator unit is equipped with: two chambers delimited by a piston inside a cylinder; a supply channel capable of supplying a working fluid discharged by a pump to the two chambers; a discharge channel capable of connecting the two chambers to a tank; a direction-control for selectively making supply of the two chambers possible in relation to the pump or tank, by connecting or blocking the supply channel and the discharge channel; a control channel for branching off from the supply channel on the pump-side thereof in relation to the direction-control valve, and connecting the pump and the tank; a variable relief valve which is provided in the control channel, allows the flow of the working fluid heading to the tank from the supply channel by opening when the pressure from the supply channel reaches a valve-opening pressure, and is capable of varying the valve-opening pressure; and a center channel for connecting the tank to the interior of the cylinder.

Transmission system

传动系统(10)包括第一活塞(12)、第二活塞(14)和调节器活塞(16)。第一活塞(12)接收输入力(F IN )，第二活塞(14)传递输出力(F OUT )，并且调节器活塞(16)传递调节力(F ACT )，该调节力调节由第二活塞(14)接收的输入力(F IN )以实现震颤消除与促使和/或提供可变的运动缩放。

HYDRAULIC SYSTEM

CONTROL METHOD AND SYSTEM FOR USING A PAIR OF INDEPENDENT HYDRAULIC METERING VALVES TO REDUCE BOOM OSCILLATIONS

A hydraulic system () and method for reducing boom dynamics of a boom (), while providing counter-balance valve protection, includes a hydraulic cylinder (), first and second counter-balance valves (), and first and second control valves (). A net load () is supported by a first chamber () of the hydraulic cylinder, and a second chamber () of the hydraulic cylinder may receive fluctuating hydraulic fluid flow from the second control valve to produce a vibratory response () that counters environmental vibrations () on the boom. The first control valve may apply a holding pressure and thereby hold the first counter-balance valve closed and the second counter-balance valve open. 120.-. (canceled)21. A hydraulic system comprising:a hydraulic cylinder;a first control valve fluidly connected to the hydraulic cylinder; anda controller in communication with the first control valve, the controller being adapted to transmit move signals to the control valve that causes the hydraulic cylinder to extend and/or retract, and the controller being adapted to transmit a vibration signal to the first control valve to produce a fluctuating pressure that causes the hydraulic cylinder to produce a vibratory response.22. The hydraulic system of claim 21 , further comprising:a second control valve fluidly connected to the hydraulic cylinder, wherein the first control valve is fluidly connected to a first chamber of the hydraulic cylinder and the second control valve is fluidly connected to the second chamber of the hydraulic cylinder.23. The hydraulic system of claim 22 , wherein the first and second control valves being independently operable with respect to each other.24. The hydraulic system of claim 21 , wherein when a net load is supported by the first chamber of the hydraulic cylinder claim 21 , and wherein when vibration control is active claim 21 , a fluctuating pressure is transmitted from the second control valve to cause the hydraulic cylinder to produce a vibratory response.25 ...

Pilot control mechanism for boom bounce reduction

A hydraulic system (600) and method for reducing boom dynamics of a boom (30), while providing counter-balance valve protection, includes a hydraulic actuator (110), first and second counter-balance valves (300, 400), first and second control valves (700, 800), and first and second blocking valves (350, 450). A net load (90) is supported by a first chamber (116, 118) of the hydraulic actuator, and a second chamber (118, 116) of the hydraulic actuator may receive fluctuating hydraulic fluid flow from the second control valve to produce a vibratory response (950) that counters environmental vibrations (960) on the boom. The first blocking valve prevents the fluctuating hydraulic fluid flow from opening the first counter-balance valve. The first blocking valve may drain leakage from the first counter-balance valve.

CONTROL METHOD AND SYSTEM FOR USING A PAIR OF INDEPENDENT HYDRAULIC METERING VALVES TO REDUCE BOOM OSCILLATIONS

A hydraulic system () and method for reducing boom dynamics of a boom (), while providing counter-balance valve protection, includes a hydraulic cylinder (), first and second counter-balance valves (), and first and second control valves (). A net load () is supported by a first chamber () of the hydraulic cylinder, and a second chamber () of the hydraulic cylinder may receive fluctuating hydraulic fluid flow from the second control valve to produce a vibratory response () that counters environmental vibrations () on the boom. The first control valve may apply a holding pressure and thereby hold the first counter-balance valve closed and the second counter-balance valve open. 1600. A hydraulic system comprising:{'b': 110', '116', '118', '118', '116, 'a hydraulic cylinder including a first chamber , and a second chamber , ;'}{'b': 300', '51, 'a first counter-balance valve fluidly connected to the first chamber at a first node ;'}{'b': 400', '52, 'a second counter-balance valve fluidly connected to the second chamber at a second node ;'}{'b': 700', '406', '53, 'a first control valve fluidly connected to the first counter-balance valve and to a pilot of the second counter-balance valve at a third node ; and'}{'b': 800', '306', '54, 'a second control valve fluidly connected to the second counter-balance valve and to a pilot of the first counter-balance valve at a fourth node );'}{'b': '90', 'claim-text': a holding pressure is transmitted from the first control valve to the third node to hold the first counter-balance valve at a closed position and to hold the second counter-balance valve at an open position, the holding pressure being less than a load pressure at the first node; and', {'b': '950', 'a fluctuating pressure is transmitted from the second control valve to the fourth node and through the open second counter-balance valve to the second node, the fluctuating pressure causing the hydraulic cylinder to produce a vibratory response .'}], 'wherein when a net load ...

Hydraulic system

A hydraulic system includes: a regulator that adjusts a tilting angle of a pump; and a controller that controls the regulator such that a discharge flow rate of the pump is a lower one of an operation-requiring flow rate and a horsepower control flow rate. The controller stores a first horsepower control line and a second horsepower control line lower than the first control line. When an operating point exceeds the first horsepower control line, the controller decreases the tilting angle of the pump; when the operating point falls below the second horsepower control line, the controller increases the tilting angle of the pump. When the operating point exceeds the first control line or falls below the second control line, it is shifted and positioned between the first control line and the second horsepower control line, keeping the tilting angle of the pump as it is.

LARGE MANIPULATOR WITH DECENTRALIZED HYDRAULIC SYSTEM

A manipulator includes an articulated boom configured to be folded out. The articulated boom includes a turntable that can be rotated about a vertical axis, a plurality of boom segments, electrically-actuated proportional valves, and a remote control. The boom segments are pivotable via respective drive assemblies. The electrically-actuated proportional valves are respectively arranged directly on or in proximity to the respective drive assemblies to be controlled. The remote control includes at least one control lever configured to be displaced in a plurality of actuating directions. The manipulator further includes an electronic controller configured to actuate the drive assemblies via a travel command. The travel command indicates a desired movement of the boom tip. The travel command is generated in response to displacement of the control lever into at least one of the plurality of actuating directions. And, the travel command causes actuation of the respective electrically-actuated proportional valves. 19-. (canceled)10. A manipulator comprising: a turntable that can be rotated about a vertical axis,', 'a plurality of boom segments, the boom segments are pivotable about respective articulation axes at articulation joints relative to an adjacent boom segment or relative to the turntable via respective drive assemblies, the drive assemblies each coupled to hydraulic control lines, wherein a last of the boom segments of the plurality of boom segments includes a boom tip, and', 'electrically-actuated proportional valves respectively arranged directly on or in proximity to the respective drive assemblies to be controlled and respectively coupled to the hydraulic control lines of the respective drive assembly;, 'an articulated boom configured to be folded out and includinga remote control having at least one control lever, the control lever configured to be displaced in a plurality of actuating directions; andan electronic controller configured to actuate the drive ...

Damping device

A damping device, in particular for damping or preventing pressure surges, such as pulsations, in hydraulic supply circuits, preferably in the form of a silencer, having a damping housing (2) encompassing a damping chamber (10), wherein said damping housing (2) has at least one fluid inlet (6) and at least one fluid outlet (8) as well as a fluid receiving chamber extending between the fluid inlet (6) and the fluid outlet (8), wherein during operation of the device a fluid flow coming from the fluid inlet (6) passes through the damping chamber (10) towards the fluid outlet (8) and wherein a wall part of the fluid receiving chamber extends as a guide element (16) in at least one direction of extension transverse to the direction of the fluid flow, is characterized in that in the damping chamber (10) several guide elements (16) are provided, against which the fluid can flow and which alter the flow velocity in certain areas.

Vibration suppression system for loading vehicle and loading vehicle

A vibration suppression system for a loading vehicle includes: a sensor configured to detect a parameter indicating acceleration along a vertical direction of a load handling apparatus or of a vehicle main body of the loading vehicle; a vibration control force generating apparatus configured to apply a vibration control force for suppressing vibration of the loading vehicle; and a controller configured to generate a feedback command to be issued to the vibration control force generating apparatus based on a detection value of the sensor.

CONTROL DEVICE FOR HYDRAULIC TRAVELING DEVICE

A travel control device is provided with hydraulic pumps of a variable capacity type that are driven by an engine; hydraulic motors that are driven by discharged oil from the hydraulic pumps; traveling devices that are rotation-driven by the hydraulic motors; a travel operation lever that is operated so as to instruct a traveling operation; a first control valve for generating a charged hydraulic pressure by adjusting the discharged oil from a charge pump and a second control valve for generating a capacity control hydraulic pressure in accordance with the operation of the travel operation lever. The first control valve is designed to pressure-adjust and generate a charged hydraulic pressure in accordance with the rotation speed of the engine, and the hydraulic pump is subjected to a variable capacity control process by a capacity control hydraulic pressure that is pressure-adjusted and generated by the second control valve. 1. A control device for a hydraulic traveling device , wherein the hydraulic traveling device comprises:a hydraulic transmission constituted by having a hydraulic pump of a variable capacity type, which is driven by an engine, and a hydraulic motor driven by discharged oil from the hydraulic pump;a traveling device that is driven by the hydraulic motor;a travel operation device that is operated so as to instruct a traveling operation by the traveling device; anda charging pressure control valve for adjusting a hydraulic pressure inside a charging oil passage for supplying oil from the charge pump to the hydraulic transmission into a charging hydraulic pressure, andwherein the control device comprises, a first control valve for adjusting the charging hydraulic pressure inside the charging oil passage in accordance with a rotation speed of the engine so as to generate an engine rotation-related control hydraulic pressure; and a second control valve for adjusting the engine rotation-related control hydraulic pressure in accordance with the ...

Pump-Controlled Hydraulic Circuits for Operating a Differential Hydraulic Actuator

Pump-controlled hydraulic circuits are more efficient than valve-controlled circuits, as they eliminate the energy losses due to flow throttling in valves and require less cooling effort. Presently existing pump-controlled solutions for single rod cylinders encounter an undesirable performance during certain operating conditions. Novel circuit designs employ use of different charge pressures on a pair of pilot-operated charging-control valves or different piston areas and/or spring constants on a shuttle-type charging control valve to shift a critical loading region in a load-force/actuator-velocity plane to a lower load force range, thereby reducing the undesired oscillations experienced in the response of the typical critical loading region. One or more specialized valves are controlled by fluid pressures to provide throttling in the circuit only within the critical loading region, thereby reducing the oscillatory amplitude while avoiding throttling-based energy losses outside the critical region over the majority of the circuit's operational overall operating area. 1. A pump-controlled hydraulic circuit for operating a differential hydraulic actuator , said circuit comprising:a reversible hydraulic pump;a first main fluid line connecting a first side of the reversible hydraulic pump to an extension side of the differential hydraulic actuator;a second main fluid line connecting a second side of the reversible hydraulic pump to a retraction side of the differential hydraulic actuator;a hydraulic charging system for supplying/releasing charging fluid to and from the first and second main fluid lines to compensate for differential flow on opposing sides of the differential hydraulic actuator;a first charging line connecting the charging circuit to the first main fluid line;a second charging line connecting the charging circuit to the second main fluid line;a set of one or more valves comprising at least one charging-control valve operably installed in the first and/ ...

PILOT CONTROL MECHANISM FOR BOOM BOUNCE REDUCTION

A hydraulic system () and method for reducing boom dynamics of a boom (), while providing counter-balance valve protection, includes a hydraulic actuator (), first and second counter-balance valves (), first and second control valves (), and first and second blocking valves (). A net load () is supported by a first chamber () of the hydraulic actuator, and a second chamber () of the hydraulic actuator may receive fluctuating hydraulic fluid flow from the second control valve to produce a vibratory response () that counters environmental vibrations () on the boom. The first blocking valve prevents the fluctuating hydraulic fluid flow from opening the first counter-balance valve. The first blocking valve may drain leakage from the first counter-balance valve. 1. A hydraulic system comprising:a hydraulic actuator including a first chamber and a second chamber;a first counter-balance valve fluidly connected to the first chamber at a first node;a second counter-balance valve fluidly connected to the second chamber at a second node;a first control valve fluidly connected to the first counter-balance valve at a third node;a second control valve fluidly connected to the second counter-balance valve at a fourth node; anda first valve fluidly connected to a pilot of the first counter-balance valve at a fifth node and fluidly connected to the second counter-balance valve and the second control valve at the fourth node.2. The hydraulic system of claim 1 , further comprising a second valve fluidly connected to a pilot of the second counter-balance valve at a sixth node and fluidly connected to the first counter-balance valve and the first control valve at the third node.3. The hydraulic system of claim 1 , wherein the first chamber is a rod chamber and the second chamber is a head chamber.4. The hydraulic system of claim 1 , wherein the first chamber is a head chamber and the second chamber is a rod chamber.5. The hydraulic system of claim 1 , wherein the first counter-balance ...

Oil vibration diagnosis apparatus and oil vibration diagnosis method

First, the pressure of oil within an oil passage in a control valve device is measured. Then, an amplitude and period of pressure fluctuations are detected on the basis of an obtained measurement result, and an oil vibration state or an oil non-vibration state is diagnosed. In this case, when the amplitude is greater than a reference amplitude value and when the period is less than a reference period value, the oil vibration state is diagnosed. Further, a duration time of the oil vibration state is determined on the basis of a diagnostic result. Then, when the oil vibration state continues for a period greater than or equal to a reference time, warning information is output. In this way, warning information is output stepwise in accordance with occurrence or continuation of oil vibration.

Actuator unit

An actuator unit includes a rod side chamber and a piston side chamber defined in the cylinder by a piston; a tank; a direction control valve configured to allow a working fluid discharged from the pump to be supplied selectively to the rod side chamber and the piston side chamber; a first control passage the rod side chamber with the tank; a second control passage the piston side chamber with the tank; a first variable relief valve provided on the first control passage, the first variable relief valve being configured to be varied a valve opening pressure; a second variable relief valve provided on the second control passage, the second variable relief valve configured to be varied a valve opening pressure; and a center passage the tank with a interior of the cylinder.

Method for determining the functionality of a fluidically driven safety valve and fluidically operated safety valve

Zum Bestimmen der Funktionsfähigkeit eines fluidisch angetriebenen Sicherheitsventils wird ein Verfahren beschrieben, das die folgenden Schritte umfasst: Ein Teilhubtest wird an dem Sicherheitsventil durchgeführt, wodurch eine Hub-Druck-Kurve erhalten wird. Die Hub-Druck-Kurve wird über den gemessenen Bereich (360) hinaus extrapoliert (330, 340), und zwar bis zur Sicherheits-Schließstellung (350). Aus der extrapolierten Hub-Druck-Kurve kann so die Schließdruck-Reserve (320) ermittelt werden. Auf diese Weise kann die Funktionsfähigkeit des Sicherheitsventils im laufenden Betrieb überprüft werden. To determine the operability of a fluidically driven safety valve, a method is described which comprises the following steps: A partial stroke test is performed on the safety valve, whereby a stroke-pressure curve is obtained. The stroke-pressure curve is extrapolated beyond the measured range (360) (330, 340) until the safety closed position (350). From the extrapolated stroke-pressure curve so the closing pressure reserve (320) can be determined. In this way, the functionality of the safety valve can be checked during operation.

Hydraulic system

Hydraulic filtering method self-adaptive to full-frequency-band working conditions

本发明涉及一种全频段工况自适应液压滤波方法，其采用C型容腔滤波器衰减液压系统高频压力脉动；利用弹性薄壁的受迫机械振动来削弱液压系统中高频压力脉动；插入式串并联H型滤波器组在中低频段对压力脉动具有较好的滤波效果；由此实现了全频谱的压力脉动滤波。滤波器的轴向长度被设计为大于压力脉动波长，且滤波器内的三种滤波结构在轴向长度范围内具有一致的压力脉动衰减效果，使滤波器具备工况自适应能力。

Hydraulic system with pressure compensator

Boom-holding control device for use in heavy construction equipments

一种吊杆锁定控制装置，用于将挖土机的吊杆设置为锁定状态或者释放状态。该装置包括：吊杆锁定阀，其设置于液压管线上，用于防止吊杆自重引起从吊杆液压缸排出液压流，从而保持吊杆为锁定状态；吊杆释放阀，用于响应由吊杆液压缸远端控制阀提供的降吊杆导引信号压和行程控制操作员界面装置发出的行程信号压中至少之一，从而将吊杆从锁定状态释放；以及螺线管致动的活页阀，其设置于行程信号管线上，用于选择性地开、闭行程信号管线。活页阀在通常情况下保持关闭位置，在行程选择开关和吊杆释放开关同时启动时将切换到打开位置。

Actuator unit

驱动器单元包括：活塞杆侧室和活塞侧室，其利用活塞在缸体内划分而成；流体箱；方向控制阀，其能够将自泵排出的工作流体选择性地供给到活塞杆侧室和活塞侧室；第一可变溢流阀，其设于连通活塞杆侧室和流体箱的第一控制通路的中途，当活塞杆侧室的压力达到开阀压力时开阀，容许工作流体的自活塞杆侧室朝向流体箱的流动，并且能够改变该开阀压力；第二可变溢流阀，其设于连通活塞侧室和流体箱的第二控制通路的中途，当活塞侧室的压力达到开阀压力时开阀，容许工作流体的自活塞侧室朝向流体箱的流动，并且能够改变该开阀压力；以及中央通路，其将流体箱连通于缸体内。

Hydraulic balancing control valve and ride control system incorporating same

A balancing valve includes four ports. While the pressures at a pair of balancing ports of a hydraulic balancing valve are equal, the valve maintains two other ports in a closed position. Upon a pressure differential between the balancing ports, fluid communication can occur between one of the balancing ports and either of the other ports based upon the direction of the pressure differential. A hydraulic ride control system utilizes the balancing valve together with other control valves to provide ride control functionality.

Hydraulic control system having swing oscillation dampening

A hydraulic control system is disclosed. The hydraulic control system may have an input device to generate a first signal indicative of a desired swing motor movement, and a control valve configured to selectively pass fluid to the swing motor and drain from the swing motor to drive the swing motor based on the first signal. The hydraulic control system may also have a pressure sensor to generate a second signal indicative of a swing motor pressure, a speed sensor configured to a third signal indicative of a swing motor speed, and a controller configured to make a comparison of at least one of the swing motor speed and the swing motor pressure with a threshold speed and a threshold pressure, and open the control valve to drain fluid from the swing motor to the tank based on the comparison when the input device is in a neutral condition.

Electro-pneumatic control system and position regulator thereof

本发明涉及一种用于气动驱动装置(2)的电动气动控制系统(1)以及用于这样的系统的电动气动的位置调节器(3)。为了提高气体流速在位置调节器(3)之后连接有具有旁路阀(30)的体积流量升压器(4)。为了在调整旁路阀(30)时辅助操作者(58)，以新的运行方式多次以最大气体流速在第一方向上驱驶气动驱动装置(2)。在超过预先给定的位置时将气体流速置为零，测定气动驱动装置(2)的超程值(Δx1)并且在显示器(53)上为操作者(58)输出。通过改变旁路阀(30)设定，操作者能够找出具有小超程的旁路阀(30)设定并且进行调整。利用如此找到的设定能够在没有附加耗费的情况下明显改善控制系统的过渡性能。

The vibration of ACTIVE CONTROL joint arm is with the device of pumping of concrete

一种主动控制关节臂(10)的振动的装置，关节臂(10)包括多个段(12-17)，每个段包括至少其自身的致动器(22)，致动器(22)与包括隔断阀(30)的液压驱动回路相关联。所述致动器(22)中的至少一个与振动的辅助控制回路(23)相关联，辅助控制回路(23)包括至少传感器(54)、处理单元(28)以及第二泵送工具(24)，所述传感器(54)能够检测到一个或多个段(12-17)的振动和/或位置，所述处理单元(28)处理传感器(54)的信号，所述第二泵送工具(24)由处理单元(28)控制并与所述隔断阀(30)合作。辅助控制回路(23)与液压驱动回路相关联。

Method and device for active suppression of pressure oscillations in hydraulic system

Группа изобретений относится к области подавления колебаний давления в гидравлической системе (10) прокатного стана холодной или горячей прокатки или установки обработки полосы из железных, стальных или алюминиевых материалов. Способ включает определение сигнала (2) давления посредством приемника (1) давления путем непрерывного измерения давления в гидравлической системе, определение переменной составляющей сигнала давления, определение по меньшей мере одного изменяющегося во времени параметра (6) регулирования в реальном времени с помощью регулятора (4) с учетом по меньшей мере одного заданного значения и переменной составляющей, и нагружение по меньшей мере одного исполнительного элемента (9) параметром регулирования, причем исполнительный элемент (9) изменяет соответствующий параметру (6) регулирования и связанный с гидравлической системой объем, благодаря чему колебания давления в гидравлической системе (10) подавляются. Устройство содержит приемник давления для определения сигнала давления, звено для определения переменной составляющей этого сигнала, устройство регулирования, на которое передается переменная составляющая и заданное значение параметра регулирования, и исполнительный элемент с изменяемым объемом. Обеспечивается подавление колебаний давления в гидравлической системе прокатного стана или установки обработки металлической полосы. 4 н. и 14 з.п. ф-лы. 4 ил. РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (51) МПК B21B 37/00 (13) 2 526 647 C2 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ (21)(22) Заявка: ИЗОБРЕТЕНИЯ К ПАТЕНТУ 2011127443/02, 30.11.2009 (24) Дата начала отсчета срока действия патента: 30.11.2009 (72) Автор(ы): ПИРКО,Антон (AT), КАЙНТЦЕЛЬ,Георг (AT) 05.12.2008 AT A1897/2008 (43) Дата публикации заявки: 10.01.2013 Бюл. № 1 R U (73) Патентообладатель(и): СИМЕНС ФАИ МЕТАЛЗ ТЕКНОЛОДЖИЗ ГМБХ (AT) Приоритет(ы): (30) Конвенционный приоритет: (45) Опубликовано: 27.08.2014 Бюл. № 24 А2, 15.09.2004. SU 1507467 А1, 15.09.2004. JP ...

Manipulator and damping device

The manipulator has a damping device (D) comprising a damping valve (11) i.e. 4/3-way control valve, arranged between a pressure source (P) and working pipelines (12) of a cantilever lifting cylinder (8). The damping valve is arranged parallel to a main valve (9) of the lifting cylinder. The damping valve is actuated by a controller (C) for oscillation damping in the lifting cylinder independent of the main valve. The damping valve is fitted without nozzles in flow paths in an application direction to the lifting cylinder and fitted with nozzles in a discharge direction.

Hydraulic system having a pressure compensator

A hydraulic system having a source of pressurized fluid and a fluid actuator with a first chamber and a second chamber. The hydraulic system also has a first valve configured to selectively fluidly communicate the source with the first chamber and a second valve configured to selectively fluidly communicate the source with the second chamber. The hydraulic system also has a supply passageway and a signal passageway each disposed between the first and second valves in parallel. The hydraulic system also has a proportional pressure compensating valve configured to control a pressure of a fluid directed between the source and the first and second valves. The hydraulic system further has a fluid passageway disposed between the supply and signal passageways to fluidly communicate the supply and signal passageways.

POWER STEERING HYDRAULIC POWER STEERING CIRCUIT AND MOTOR VEHICLE PROVIDED THEREWITH.

VALVE DEVICE FOR A HYDRAULIC MOTOR CAPABLE OF DRIVING A LARGE INERTIA MASS

HYDRAULIC SHOCK ABSORBER

DEVICE WITH HYDRAULIC VALVES

Pressure-dependent check valve and hydraulic system equipped therewith

The inventive sliding valve ( 8 ) comprises a slide ( 18 ), which is mounted in a manner that enables it to move transversal to the passage channel ( 11 ). This valve is provided with an asymmetrical design whereby enabling the pressure prevailing in the passage channel ( 11 ) to reach a side of the slide ( 18 ) via suitable ducts ( 25, 26 ), whereas the other side is not subjected to any pressure or only to a constant low pressure. A pressure spring ( 29 ) works counter to the pressure and holds the slide ( 18 ) in the open position. In the event the fluid pressure prevails, the slide ( 18 ) is displaced into the blocking position in which it remains until the pressure falls below the switching limit once again.

Actuator unit

An actuator unit includes a rod side chamber and a piston side chamber defined in the cylinder by a piston; a tank; a direction control valve configured to allow a working fluid discharged from the pump to be supplied selectively to the rod side chamber and the piston side chamber; a first control passage that enables fluid communication between the rod side chamber and the tank; a second control passage that enables fluid communication between the piston side chamber and the tank; a first variable relief valve provided on the first control passage and being configured to vary a first valve opening pressure; a second variable relief valve provided on the second control passage and being configured to vary a second valve opening pressure; and a center passage that enables fluid communication between the tank and an interior of the cylinder.

COOL COMPENSATOR.

Sliding regulator for determining two consecutive pressures in hydraulically controlled machines, in particular in hydraulic presses for electric resistance welding

Engineering machinery

本发明提供工程机械，即使在发动机的最小转速和最大转速之间具有在转速下降时转矩急剧降低的转速域，也难以发生共振、加载减速，而且易于在高转速域对发动机转速进行微调整。其中，作为目标转速，能够除去比发动机的最小转速高的第一转速和比第一转速高且比最大转速低的第二转速之间的区域地设定，在从指示发动机的最小转速的发动机转速指示装置的操作量移至指示第一转速的发动机转速指示装置的操作量时的目标转速的变化相对于发动机转速指示装置的操作量的变化的比例比在从指示发动机的第二转速的发动机转速指示装置的操作量移至指示最大转速的发动机转速指示装置的操作量时的目标转速的变化相对于发动机转速指示装置的操作量的变化的比例大。

Steering hydraulic drive booster and vehicle equipped therewith

FIELD: transport. SUBSTANCE: proposed device comprises one input for control command feed and one hydraulic fluid output. Said output is intended for feeding hydraulic fluid to hydraulic cylinder to drive running gear coupled with drive cylinder. Said device comprises pump, one first hydraulic fluid line and one second line, and distribution valve. The latter comprises first and second fluid feed inlets communicated with pump via first and second lines, and one extra inlet communicated with outlet. Valve has open flow area between extra inlet and first or second inlet that varies subject to input command. Said open flow area on way from pump to first inlet is restricted by appliance intended to this end. For running gear with dynamics wherein first order corresponds to first asymmetric mode of running gear with definite intrinsic frequency, said restrictor is configured to make input pressure transfer function with zero frequency at input relative to command signal, said frequency being lower than intrinsic frequency of running gear first asymmetric mode. Vehicle comprises steering wheel coupled via with steering column with toothed rack engaged with running gear. Said rack is engaged with one drive hydraulic cylinder. Vehicle incorporates aforesaid booster. Appliance is used to feed control command to hydraulic circuit input. EFFECT: reduced vibrations in steering. 10 cl, 8 dwg РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) 2 460 659 (13) C2 (51) МПК B62D 5/06 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (21)(22) Заявка: 2010102514/11, 19.05.2008 (24) Дата начала отсчета срока действия патента: 19.05.2008 (73) Патентообладатель(и): РЕНО С.А.С. (FR) R U Приоритет(ы): (30) Конвенционный приоритет: 27.06.2007 FR 0704605 (72) Автор(ы): МАРТИНЕ Дидье (FR) (43) Дата публикации заявки: 10.08.2011 Бюл. № 22 2 4 6 0 6 5 9 (45) Опубликовано: 10.09.2012 Бюл. № 25 (56) Список документов, цитированных в отчете о поиске: RU 16122 U1, 10. ...

Patent FR1578917A

Valve control unit for a hydraulic elevator

The invention relates to a valve control device (28) for a hydraulic elevator. Said valve control device comprises two control valves (5, 15) which are used to control the flow of hydraulic oil from a lifting cylinder driving the elevator car or from the lifting cylinder to the tank. During the upward journey of the elevator car, hydraulic oil is fed from the tank to the lifting cylinder via the valve control unit (28) by means of a pump which is driven by an electric motor. During the downward journey of the elevator car, the hydraulic oil flows to the tank via the valve control unit (28) without the pump being in operation. According to the invention, a respectively individual control valve (5, 15) is provided in the valve control unit in order to control the upward and downward journeys of the elevator car, whereby each valve functions as a return valve and a proportional valve. Each control valve (5, 15) is provided with a throttle element (35; 55) which can move in relation to the seat (36; 56). A readjusting spring (37; 57) and a relay valve (5v; 15v) act upon the throttle element (35; 55) and can be actuated by an electrically controllable proportional magnet (5M; 15M). The valve control unit (28) is easily constructable and can therefore be produced at low cost. One particular advantage of the invention is that adjusting elements are not required.

Hydraulic cylinder device

Anti-pendulum valve for a hydraulic rotary drive

Die Erfindung betrifft ein hydraulisches Ventil (10) mit einem Fluidströmungspfad (12), der sich zwischen einem ersten und einem zweiten Ventilanschluss (21; 22) erstreckt, wobei der Fluidströmungspfad (12) zwischen einem ersten und einem zweiten Pfadabschnitt (13; 14) teilweise von einem bezüglich einer Längsrichtung (11) beweglichen Steuerschieber (40) begrenzt wird, der in Längsrichtung (11) nacheinander eine erste, eine zweite, eine dritte, eine vierte und eine fünfte Schaltstellung (51–55) aufweist, wobei wenigstens eine Feder (15; 16) vorgesehen ist, welche so gegen den Steuerschieber (40) verspannt ist, dass dieser sich in Richtung der dritten Schaltstellung (53) bewegt, wobei der Steuerschieber (40) von einem Druck im ersten Pfadabschnitt (13) derart beaufschlagt ist, dass er sich in Richtung der ersten Schaltstellung (51) bewegt, wobei er vom einem Druck im zweiten Pfadabschnitt (14) derart beaufschlagt ist, dass er sich in Richtung der fünften Schaltstellung (55) bewegt, wobei der Steuerschieber (40) so ausgebildet ist, dass der Fluidströmungspfad (12) in der ersten und der fünften Schaltstellung (51; 55) gesperrt ist, wobei der Steuerschieber (40) so ausgebildet ist, dass er in der zweiten und der vierten Schaltstellung (52; 54) eine Engstelle in dem Fluidströmungspfad (12) begrenzt. Erfindungsgemäß ist an einer Außenumfangsfläche (41) des Steuerschiebers wenigstens eine sich in Längsrichtung erstreckende Nut (45) angeordnet, wobei der Fluidströmungspfad (12) seitens des Steuerschiebers (40) ausschließlich von der wenigstens einen Nut (45) begrenzt wird.

Hydraulic system with regeneration and both-initiated strategy

公开一种具有再生和混合启动的液压系统。该液压系统可包括流体源和具有第一通道和第二通道的致动器。液压系统还可包括泵，泵具有连接到第一通道的第一端口、连接到第二通道的第二端口和连接到流体源的第三端口。第一通道和第二通道可经由第一端口和第二端口连接到彼此，并且第一通道和流体源可经由第一端口和第三端口连接到彼此。液压系统还可包括流体连接到第一通道和第二通道的加载回路和能够选择性地允许来自泵的流体传到加载回路以抑制致动器和泵之间的压力振荡的至少一个阻尼控制阀。

Hybrid excavator having a system for reducing actuator shock

Pressure regulator for hydraulically controlled machine tools

A pressure regulator for hydraulically controlled machine tools comprises a first directly controlled three-way pressure-regulating valve with which required work pressure can be set by a machine control system. In addition to a first surface, the control spool is provided with a second surface to which hydraulic fluid under the pressure at the pressure port can be applied by means of an externally controllable valve. This results in an additional force acting upon the control spool in the direction opposite to, or in the direction of, the force exerted by the elastic element on the control spool.

Hydraulic steering system for utility vehicles

CONTROL FOR A HYDRAULIC ADJUSTMENT ENGINE

Device and method for suppressing self-excited oscillation of servo valve by adjustable nozzle-baffle distance

本发明公开一种喷嘴挡板距离的抑制伺服阀自激振荡装置，包括阀座、与所述阀座一体铸造的阀台以及与所述阀台通过螺栓固定连接的弹簧管；所述阀台内部设置有十字型通孔且所述十字型通孔的竖直通孔与所述阀座的中心滑道连通；所述十字型通孔的水平通孔设置有两个可调喷嘴，所述可调喷嘴靠近十字型通孔交叉口一端设置有喷嘴口，另一端与所述十字型通孔的水平通孔螺纹密封连接，所述可调喷嘴的喷嘴口与滑阀两端连通；所述弹簧管内设置有一柱形挡板，所述挡板上端与所述弹簧管固定连接，所述挡板与所述可调喷嘴的喷嘴口形成射流场，本发明改变可调喷嘴与挡板的距离，优化喷嘴挡板之间的流场状态，抑制喷嘴挡板伺服阀自激振荡。

Valve device for hydraulic engine for driving a large flywheel mass

The invention concerns a valve device (10) for at least a hydraulic engine driving a large flywheel mass. The device comprises two main conduits (12, 14) respectively designed to be connected to two main pipes (supply and exhaust) of the engine, and an auxiliary conduit (15), for instance connected to supercharging pipe. The device is capable of having two configurations, depending on whether the pressure is higher in one or the other of the main conduits, wherein the main conduit with high pressure is isolated, while the low pressure conduit is connected to the auxiliary conduit. Said device comprises timing means (36, 46, 38, 48) for limiting the speed of the passage between one or the other of the first and second configurations when the sign of the pressure level difference in the first and second main conduits (12, 14) changes.

Hydraulic system

The invention concerns a hydraulic system (1) with a pressure source (2, 3) controllable by way of a load sensing signal, a pressure sink (4), at least two work sections (6, 7), each having a hydraulic load (8, 18) and a control valve (9, 9') with a load sensing signal connection (19, 20; 19', 20') and at least one back-pressure valve (17) arranged in a tank conduit between the control valve (9, 9'9 and the pressure sink (4). In such a system the pressure required from the pump in the neutral position is to be as low as possible. On the other hand, however, oscillations should not occur when an external force acts on another hydraulic load in the neutral position of a control valve. In the neutral position of the control valves (9, 9') the load sensing signal connection ( 19, 20; 19' 20') is therefore connected with the pressure sink (4) by way of an auxiliary tank conduit (23, 23', 23''; 29) by-passing the back-pressure valve (17).

Valve unit for hydraulic motor driving substantial inertia weight

The valve unit (10) has two main channels (12,14) connected to two main feed or return pipes of a hydraulic motor and a connecting duct (20). The connecting duct is able to link the two channels (12,14) when the fluid pressures in them are more or less equal and separate them from one another when the pressures differ. The unit incorporates delay elements (39,41,46,48), and the connecting duct can have a calibrated restriction (21).

There is the hydraulic system of regeneration and both-initiated strategy

公开一种具有再生和混合启动的液压系统。该液压系统可包括流体源和具有第一通道和第二通道的致动器。液压系统还可包括泵，泵具有连接到第一通道的第一端口、连接到第二通道的第二端口和连接到流体源的第三端口。第一通道和第二通道可经由第一端口和第二端口连接到彼此，并且第一通道和流体源可经由第一端口和第三端口连接到彼此。液压系统还可包括流体连接到第一通道和第二通道的加载回路和能够选择性地允许来自泵的流体传到加载回路以抑制致动器和泵之间的压力振荡的至少一个阻尼控制阀。

Power-assisted steering hydraulic actuating circuit and motor vehicle provided therewith

The invention relates to a power-steering hydraulic actuating circuit for a motor vehicle, comprising a hydraulic fluid distributing valve (9) having hydraulic fluid supply ports (91, 92) connected to a pump (10) via lines (11, 12). According to the invention, a means (20) for restricting the cross section of hydraulic fluid flow from the pump (10) to the port (92) is provided on the high-pressure line (11).

System for damping mass-induced vibration in machines having hydraulically controlled booms or elongate members

A system for damping mass-induced vibrations in a machine having a long boom or elongate member, the movement of which causes mass-induced vibration in such boom or elongate member. The system comprises multiple pressure sensors operable to measure pressure fluctuations in the hydraulic fluid pressures in the non-load holding and load holding chambers of a hydraulic actuator connected to the boom or elongate member that result from mass-induced vibration, and a processing unit operable to control a first control valve spool in a pressure control mode and a second control valve spool in a flow control mode in order to adjust hydraulic fluid flow to the actuator's load holding chamber to dampen the mass-induced vibration. The system further comprises a control manifold fluidically interposed between the actuator and control valve spools that causes the first and second control valve spools to operate, respectively, in pressure and flow control modes.

High speed pneumatic servo actuator

A hydraulic damper (11) for a high speed actuator (14) is provided to bring the actuator to rest with minimum oscillation around a target position. The hydraulic damper (11) comprises a hydraulic circuit to communicate with the actuator over its entire positional range for the purpose of dampening a sudden stop of the actuator (14) about a target position.

Telescopic control system and engineering machinery

本发明涉及工程机械技术领域，特别涉及一种伸缩控制系统和工程机械。本发明的伸缩控制系统，包括：伸缩油缸，用于与伸缩臂驱动连接，伸缩油缸的第一腔进油且第二腔回油时，伸缩油缸驱动伸缩臂伸出，第二腔进油且第一腔回油时，伸缩油缸驱动伸缩臂缩回，第一腔为有杠腔和无杆腔中的一个，第二腔为有杆腔和无杆腔中的另一个；和平衡阀，第一工作口与第一腔连接，且控制端与第二腔隔离。通过使平衡阀的控制端与伸缩油缸隔离，本发明能够降低负载压力波动对平衡阀阀口开度的影响，有效改善缩臂抖动现象。

Working machine

엔진의 최소 회전수와 최대 회전수 사이에, 회전수가 떨어졌을 때에 토오크가 급감하는 회전수 영역이 있더라도, 공진이나 러그 다운이 발생하기 어렵고, 또한, 고회전수 영역에서 엔진 회전수를 미세 조정하기 쉬운 작업 기계를 제공한다. 목표 회전수로서, 엔진의 최소 회전수보다 높은 제 1 회전수와, 제 1 회전수보다 높고 최대 회전수보다 낮은 제 2 회전수와의 사이의 영역을 제외하고 설정 가능하고, 엔진의 최소 회전수를 지시하는 엔진 회전수 지시 장치의 조작량으로부터 제 1 회전수를 지시하는 엔진 회전수 지시 장치의 조작량까지 이행시켰을 때의 엔진 회전수 지시 장치의 조작량의 변화에 대한 목표 회전수의 변화의 비율이, 엔진의 제 2 회전수를 지시하는 엔진 회전수 지시 장치의 조작량으로부터 최대 회전수를 지시하는 엔진 회전수 지시 장치의 조작량까지 이행시켰을 때의 엔진 회전수 지시 장치의 조작량의 변화에 대한 목표 회전수의 변화의 비율보다 큰 것을 특징으로 한다.

Hydraulic system for working machine

A hydraulic system for a working machine includes a hydraulic actuator having a first fluid chamber and a second fluid chamber, an accumulator, an outputting fluid tube to output an operation fluid, and a switching valve to be switched between a first position and a second position. The first position allows the first fluid chamber and the second fluid chamber to be communicated with the outputting fluid tube and thereby allowing a floating operation. The second position allows the first fluid chamber and the accumulator to be communicated with each other, allows the second fluid chamber and the outputting fluid tube to be communicated with each other, and thereby allows an anti-vibration operation.

Hydraulic control device for working vehicle

System and method for executing Password Operations across different types of processing hardware

本公开涉及用于跨不同类型的处理硬件执行密码操作的系统和方法。中间装置可以根据来自客户机或服务器的消息来识别要在装置处执行的密码功能。装置可以识别要执行的用于执行密码功能的密码操作的序列。装置可以确定要在不同类型的处理硬件上执行的密码操作的子集。不同类型的处理硬件可以驻留在装置上。响应于该确定，每种类型的处理硬件可以根据密码操作的序列执行密码操作的相应子集。

Hydraulic pressure control valve - has pilot stage with proportional solenoid operating in closed loop to counter HF disturbances

A hydraulic system has a pump (2) that delivers flow to both a main (8) and pilot (6) control valves. The main valve supplies an actuator (20) which is displaced in a controlled mode. Feedback is provided by a displacement transducer (60) and a control loop causes the pilot valve proportional solenoid (48) to respond to vary the input connecting line (40). If pressure variations occur in the supply from the pump, the pilot stage responds to provide a compensating action.

Method for controlling a hydraulic system

本发明涉及控制液压系统的方法。一种液压系统可以包括电液控制阀，该电液控制阀设置成在加压流体源和液压致动器之间流体连通。液压系统可以被控制以校正目标致动器压力和从控制阀输出的当前致动器压力之间的偏移误差，而不放大控制阀和液压致动器之间的流体中的压力振荡。

Transmission system

A transmission system (10) includes a first piston (12), a second piston (14) and a modulator piston (16). The first piston (12) receives an input force (FIN), the second piston (14) transmits an output force (FOUT), and the modulator piston (16) transmits a modulating force (FACT>which modulates the input force (FIN) received by the second piston (14) to implement tremor cancellation and force and/or provide variable motion scaling.

Device for converting volume flows and hydraulic presses with such a device

Eine Vorrichtung zum Umwandeln von Volumenströmen, vorzugsweise zum Umwandeln eines nicht-konstanten, insbesondere impulsartigen, Volumenstroms, der von einem hydraulischen Verbraucher (18) stammt, in einen konstanten Volumenstrom, der in einen Vorratstank (16) strömt, ist dadurch gekennzeichnet, dass zwischen dem Verbraucher (18) und dem Vorratstank (16) in den Fluidstrom ein Niederdruckspeicher (10) als Fluid-Zwischenspeicher und zwischen diesem Zwischenspeicher und dem Tank (16) ein Stromregler (12) geschaltet ist. A device for converting volume flows, preferably for converting a non-constant, in particular pulse-like, volume flow originating from a hydraulic consumer (18) into a constant volume flow which flows into a storage tank (16), is characterized in that between between the consumer (18) and the storage tank (16), a low-pressure accumulator (10) is connected in the fluid flow as an intermediate fluid storage facility and a flow regulator (12) is connected between this intermediate storage facility and the tank (16).

Device for active control of the vibrations of an articulated arm for pumping concrete

Oil pressure system

油压系统具备调节泵的倾转角的调节器和以泵的吐出流量成为操作要求流量和马力控制流量中较小的一方的形式控制调节器的控制装置；控制装置中储存有第一马力控制线和比其低的第二马力控制线；控制装置在从操作装置输出的操作信号增加且操作要求流量大于马力控制流量的情况下，当工作点越过第一马力控制线时使泵的倾转角减少，当工作点低于第二马力控制线时使泵的倾转角增加，当越过第一马力控制线或低于第二马力控制线的工作点移动到第一马力控制线与第二马力控制线之间时维持泵的倾转角。

Electric pneumatic control system and its position control

本发明涉及一种用于气动驱动装置(2)的电动气动控制系统(1)以及用于这样的系统的电动气动的位置调节器(3)。为了提高气体流速在位置调节器(3)之后连接有具有旁路阀(30)的体积流量升压器(4)。为了在调整旁路阀(30)时辅助操作者(58)，以新的运行方式多次以最大气体流速在第一方向上驱驶气动驱动装置(2)。在超过预先给定的位置时将气体流速置为零，测定气动驱动装置(2)的超程值(Δx1)并且在显示器(53)上为操作者(58)输出。通过改变旁路阀(30)设定，操作者能够找出具有小超程的旁路阀(30)设定并且进行调整。利用如此找到的设定能够在没有附加耗费的情况下明显改善控制系统的过渡性能。

Systems and methods for executing cryptographic operations across different types of processing hardware

The present disclosure is directed towards systems and methods for executing cryptographic operations across different types of processing hardware. An intermediary device may identify a cryptographic function to be performed at the device, according to a message from a client or a server. The device may identify a sequence of cryptographic operations to be executed for performing the cryptographic function. The device may determine subsets of the cryptographic operations to be executed on across different types of processing hardware. The different types of processing hardware may reside on the device. Each of the types of processing hardware may execute, responsive to the determination, the respective subset of the cryptographic operations, according to the sequence of the cryptographic operations.

Method and device for the semi-active reduction of pressure oscillations in a hydraulic system

本发明涉及一种用于半有源降低铁材、钢材或铝材的冷轧机或热轧机或带材处理设备的液压系统内的压缩振荡的方法和装置。本发明的目的在于，提供一种方法和装置，利用该方法借助一种简单和成本低廉的装置可以有源降低出现的压缩振荡。该目的通过开头所述类型的方法得以实现，所述方法包括以所称顺序的下列方法步骤：a)通过持续测量液压系统内的压力借助压力传感器检测压力信号；b)测定压力信号的交流分量；c)在考虑到交流分量的情况下利用调节器实时测定至少一个时间上变化的调节变量；d)对至少一个促动器施加调节变量，其中，促动器改变与液压系统连接的减振器的固有频率并由此降低液压系统内压缩振荡的振幅。

An arrangement for charging an accumulator

The invention relates to an arrangement for charging an accumulator (10) with hydraulic fluid. The accumulator (10) is used in a hydraulic boom suspension system (3) for a lift arm (55) of a vehicle (50) and the arrangement comprises a first hydraulic pump (4) arranged to supply hydraulic fluid to a hydraulic cylinder system (2) of the lift arm (55), and a second hydraulic pump (5) arranged to supply hydraulic fluid to a second hydraulic system. The second hydraulic pump (5) is further arranged to supply hydraulic fluid for charging the accumulator (10).

Electrohydraulic arrangement and hydraulic axle

본 발명은 유압 차축용 전자 유압 장치에 관한 것이다. 전자 유압 장치는 부하의 구동을 위한 유압 기계를 포함한다. 유압 기계는 전기 모터를 통해 구동될 수 있고, 상기 전기 모터는 구동 제어 장치를 통해 제어될 수 있다. 추가로, 구동 제어 장치는 브레이크 밸브를 제어할 수 있고, 상기 브레이크 밸브에 의해 부하의 제동 과정들이 정확하게 제어된다. The present invention relates to an electro-hydraulic device for a hydraulic axle. The electro-hydraulic device includes a hydraulic machine for driving a load. The hydraulic machine may be driven by an electric motor, and the electric motor may be controlled by a drive control device. In addition, the drive control device can control a brake valve, by means of which braking processes of the load are accurately controlled.

Electrohydraulic device and hydraulic shaft

本发明涉及一种用于液压轴的电动液压的装置。所述装置具有用于驱动负载的液压机。所述液压机又通过电马达能够驱动，所述电马达通过驱动调节器能够控制。附加地，所述驱动调节器能够控制制动阀，利用所述制动阀能够精准地控制所述负载的制动过程。

Intelligent ride control

A hydraulic system includes a hydraulic mechanism that includes a first and a second chamber. The hydraulic system includes a control valve fluidly connected to the first chamber and a pressure sensor that is configured to measure the fluid pressure in the first chamber. The hydraulic system includes a processing unit connected to the control valve. The processing unit is configured to control a hydraulic fluid flow rate to and from the first chamber of the hydraulic mechanism via the control valve to provide a shock absorption response. The hydraulic fluid flow rate is based at least in part on a pressure measurement received from the pressure sensor. The shock absorption response is based on a simulated hydraulic accumulator.

Machine having selective ride control

A machine (10) has a first work arm (22), at least one first cylinder (26) having a lift chamber (52) configured for receiving pressurised fluid so as to lift the first work arm (26) and a first accumulator (74) associated with the lift chamber (52) of the first cylinder (26). The machine (10) further bus a second work arm (30), at least one second cylinder (33) having a lift chamber (152) configured for receiving pressurised fluid so as to lift the second work arm (30) and a second accumulator (174) associated with the lift chamber (152) of the second cylinder (33). A control arrangement (90) is provided for selectively fluidly connecting one or both of the first and second accumulators (74,174) with their associated lift chambers (52,152).

Elevating device equipped with an outflow pressure balance device and the outflow pressure balance device

Hydraulic shovel

작업기에 의한 설계면의 침식을 억제할 수 있는 유압 셔블을 제공한다. 붐 하강용 파일럿 포트에 접속되어 있는 붐 하강용 파일럿 관로에는, 붐 하강용 비례 전자 밸브가 설치되어 있다. 제1 압력 센서는, 조작 레버와 붐 하강용 비례 전자 밸브 사이의 붐 하강용 파일럿 관로에 발생하는 압력을 검출한다. 컨트롤러는, 제1 압력 센서에 의해 검출된 압력에 기초하여, 붐 하강용 비례 전자 밸브의 개방도를 제어한다. 컨트롤러는, 붐 하강용 비례 전자 밸브에 대하여 출력하는 전류값을, 영으로부터 완만하게 증가시킨다. A hydraulic excavator capable of suppressing erosion of a design surface by a working machine is provided. The proportional solenoid valve for boom descent is provided in the boom-down pilot pipe connected to the boom-down pilot port. The first pressure sensor detects the pressure generated in the pilot pipe for boom descent between the operation lever and the boom descent proportional solenoid valve. The controller controls the opening degree of the boom-down proportional solenoid valve based on the pressure detected by the first pressure sensor. The controller gradually increases the current value output from the boom-down proportional solenoid valve from zero.

Combined damper and truck positioner for landing gear

A combine hydraulic damper and truck positioner mechanism (20) for a landing gear (22) of an airplane. The landing gear being swingingly attached to the airplane for reciprocating movement of the landing gear between an extended position and a retracted position. The landing gear including an elongate main strut (24) having one end swingingly attached to the airplane and a longitudinally spaced second end (36). The landing gear futher including a truck beam assembly (26) pivotally attached to the strut second end. The truck beam assembly having at least two wheels (30) journaled thereto. The combined damper and truck positioner mechanism including a housing (60) having one end (68) adapted to be fastened to the strut. The housing having an interior bore (66) with a predetermined cross-sectional area. The combined damper and truck positioner mechanism further including a piston (64) having a first piston head end (90) and a longitudinally spaced second end (112) adapted to be fastened to the truck beam assembly. The piston head being slidably received within the bore for sliding movement of the piston in response to pivoting movement of the truck beam assembly when the piston second end is attached to the truck beam assembly. The combined damper and truck positioner mechanism also including a damping assembly (54) in fluid communication with the housing. The damping assembly maintaining a substantially constant fluid pressure withint the housing to dampen loads associated with the sliding movement of the piston when the landing gear is in the extended position.

Hydraulic drive system for work vehicle

The aim of the present invention lies in providing a hydraulic drive system for a work vehicle, in which hydraulic oil can be supplied to an accumulator when a work device is raised, and in which, when the work device is held in a raised state, except during loaded travel, lowering of the work device caused by leakage of hydraulic oil inside a bottom chamber of a hydraulic cylinder into a hydraulic oil tank through a gap in a control valve can be reliably prevented. When a work device (2) is raised, discharge oil from a main pump (13) is conducted through an accumulator valve (61) to an accumulator (40). Further, when the work device (2) is held in a raised state, except during loaded travel, leakage of hydraulic oil inside a bottom chamber (11a) of a lift arm cylinder (11) into a hydraulic oil tank (17) through a gap in a control valve (20) for the lift arm is prevented by means of a poppet (71) of a load retention valve (70).

Fluid pressure damper

Damping arrangement for damping the oscillations of valves controlled by pressure fluid

Abstract, A damping arrangment for damping the oscillations of valves controlled by pressure fluid comprises a throttle gap (28) which brings about laminar flow by reason Or the shape of the gap. The height of the gap varies oppositely to the temperature of the pressure fluid. This fully or partially compensates changes in the hydraulic resistance occasioned by the temperature. This leads to damping of oscillatons substantially independently of temperature. Fig. 4

Patent DE3733740C2

Hydraulic system

The hydraulic system according to the present invention is provided with a regulator for adjusting the tilt angle of a pump, and a control device for controlling the regulator so that the discharge flow rate of the pump is equal to the lesser of an operation required flow rate and a horsepower control flow rate, a first horsepower control line and a second horsepower control line lower than the first horsepower control line being stored in the control device, the control device reducing the tilt angle of the pump when a working point exceeds the first horsepower control line in a case in which an operation signal outputted from an operation device is increased and the operation required flow rate is greater than the horsepower control flow rate, the control device increasing the tilt angle of the pump when the working point falls below the second horsepower control line, and the control device maintaining the tilt angle of the pump when a working point that exceeds the first horsepower control line or is below the second horsepower control line is shifts to between the first horsepower control line and the second horsepower control line.

Device for controlled re-entry of a cylinder

The present invention regards a device for controlling a displacement of a load, comprising:a first conduit (20), configured so as to be able to connect a first chamber (C1) of a cylinder (C) with a distributor (D); a second conduit (30), configured so as to be able to connect a second chamber (C2) of the cylinder (C) with the distributor (D);a first valve (6), arranged along the first conduit (20), which is configured so as to be able to allow the flow of fluid from the distributor (D) to the first chamber (C1) and to prevent the flow of fluid from the first chamber (C1) towards the distributor (D);a second valve (1), arranged along the second conduit (30), which is arranged to assume a closed configuration, in which it prevents the flow of fluid along the second conduit (30), and an opening configuration, in which it allows the flow of fluid along the second conduit (30), only if piloted by a pilot pressure higher than a predetermined value;a pilot conduit (40), which connects the second valve (1) with the first conduit (20) and configured so as to allow a pilot pressure to reach said second valve (1);wherein said device further comprises a third conduit (50) which connects a portion of said pilot conduit (40) to a portion of said second conduit (30) comprised between said second valve (1) and said second chamber (C2) and by the fact that along said third conduit (50) is positioned a third valve (11), which is configured so as to allow a flow of fluid from said first conduit (20) to said second conduit (30) and to prevent the opposite flow and a first orifice (8) positioned along said third conduit (50) between said third valve (11) and said pilot conduit (40).

Actuator

【課題】 被制振対象の振動を安定的に抑制することが可能なアクチュエータを提供する。 【解決手段】 アクチュエータ１が、シリンダ２内にピストン３で区画した二つの室５，６と、ポンプ８から吐出される液体を二つの室５，６に供給可能な供給通路２４と、二つの室５，６をタンク７に連通可能な排出通路１０Ａ，１０Ｂと、供給通路２４と排出通路１０Ａ，１０Ｂを連通・遮断して各部屋５，６をポンプ８またはタンク７に選択的に供給可能な方向制御弁９Ａ，９Ｂと、供給通路２４の方向切換弁９Ａ，９Ｂよりもポンプ側から分岐してポンプ８とタンク７とを連通する制御通路２６と、制御通路２６に設けられて供給通路２４の圧力が開弁圧に達すると開弁して供給通路２４からタンク７へ向かう液体の流れを許容するとともに当該開弁圧を変更可能な可変リリーフ弁１５と、タンク７をシリンダ２内に連通するセンター通路１６とを備える。 【選択図】 図１ PROBLEM TO BE SOLVED: To provide an actuator capable of stably suppressing vibration of a vibration-controlled object. An actuator 1 includes two chambers 5 and 6 partitioned by a piston 3 in a cylinder 2, a supply passage 24 that can supply liquid discharged from a pump 8 to the two chambers 5 and 6, and two chambers The chambers 5 and 6 can be connected to the tank 7 and the discharge passages 10A and 10B, and the supply passage 24 and the discharge passages 10A and 10B can be communicated and cut off to selectively supply the chambers 5 and 6 to the pump 8 or tank 7. Directional control valves 9A and 9B, a control passage 26 which branches from the pump side of the direction switching valves 9A and 9B of the supply passage 24 and communicates the pump 8 and the tank 7, and a supply passage provided in the control passage 26 When the pressure of the valve 24 reaches the valve opening pressure, the variable relief valve 15 that opens and allows the flow of the liquid from the supply passage 24 to the tank 7 and can change the valve opening pressure, and the tank 7 in the cylinder 2 are opened. Communication center And a passage 16. [Selection] Figure 1

Hybrid excavator having a system for reducing actuator shock

하이브리드 굴삭기의 붐실린더 등의 작동 시작시에 발생되는 충격을 저감시키기 위한 하이브리드 굴삭기를 개시한다. 본 발명에 따른 하이브리드 굴삭기에 있어서, 전기모터에 연결되어 정방향 또는 역방향으로 구동되는 유압펌프-모터와, 유압펌프-모터에 연결되어 신축 구동되는 유압실린더와, 유압펌프-모터와 유압실린더사이의 제1,2유로에 각각 설치되고 외부로부터의 제어신호에 의해 절환시 제1,2유로를 단속하는 제1,2유압밸브와, 제1,2유압밸브의 상류측 제1,2유로와 제1,2유압밸브의 하류측 제1,2유로에 각각 분기접속되는 제1,2분기유로에 연결되는 연결통로에 설치되며, 절환시 유압실린더의 라지챔버 및 스몰챔버의 단면적 차이로 인해 발생되는 유량 차이를 극복하기 위하여 유량을 보상하거나 바이패스시키는 제3유압밸브와, 제3유압밸브를 절환시키도록 제1,2유로의 압력을 파일럿 신호압으로 공급하며 파일럿 챔버의 단면적이 상이하게 형성되는 제1,2파일럿 챔버로 이뤄지는 것을 특징으로 하는 하이브리드 굴삭기를 제공한다.

Apparatus and methods for the control of hydraulic actuators

Methods of controlling an actuator during operation using a hydraulic circuit, and related apparatus, are described. The circuit has a first path section along which fluid is supplied to a first chamber of the actuator using a first valve and a second path section along which fluid is extracted from a second chamber of the actuator using a second valve. Pressure data associated with a pressure of the fluid supplied to the first side of the actuator are obtained, a pilot pressure pPilot is produced based on the data and the first and second valves are configured based on the pilot pressure pPilot.