头钉

SCALE-UP METHOD FOR METALLURGICAL PROCESS

A scale-up method for a metallurgical process, belonging to the field of metallurgy and chemical industry equipment research and scale up. Said method comprises: using a metallurgical macroscopic reaction kinetics research method to determine an overall rate equation and determine the most critical process step having an influence on a reaction rate, so as to obtain reaction characteristics; determining physical field characteristics of a reactor by using a physical simulation and/or numerical simulation method, and optimizing the reactor; determining a single factor of a reaction period according to the reaction characteristics and the physical field characteristics of the reactor; determining a scale-up number of the single factor according to influence relations of the metallurgical reaction process; and solving the pilot-scale test result using a hot test or simulation means, verifying the scale-up number, obtaining a scale-up plan, and industrializing same, so as to complete the scale-up ...

Jacking type airplane front wheel turning test tool

A whole jacking type airplane front wheel turning testing tool is moved to an airplane front wheel, a ball head at the lower end of an airplane front wheel shaft is right opposite to a ball groove I, and a bolt sequentially penetrates through a through hole and a fixing hole in the lower end of the airplane front wheel shaft and then is locked and fixed through a nut. And then the jacking device drives the fixed seat to move upwards, so that the rotating sleeve moves upwards, and the front wheels of the airplane are driven to move upwards until the front wheels leave the ground. When the front wheels of the airplane steer, the rotating sleeve is driven by the bolt to rotate relative to the fixed seat by utilizing the rotating mechanism, so that the turning function test of the front of the airplane is realized, the whole device is simple in structure, and compared with an existing airplane front wheel turning test tool, the airplane does not need to be moved, and only the jacking type airplane ...

Cutter initial point calculation method for multi-specification pipe cutting machine

The invention provides a multi-specification pipe cutting machine cutter starting point calculation method, which comprises a mounting disc, a driving structure, a rocker arm and a cutter, the mounting disc is respectively coupled with the rocker arm, one end of the rocker arm is connected with the driving structure, the other end of the rocker arm is connected with the cutter, and the driving structure drives the rocker arm to move so as to drive the cutter to feed or withdraw. The original point positions P0'of different pipe diameters can be rapidly obtained through calculation, the distance D1 from a cutter to the pipe surface is not changed, pipe cutting is more accurate, the initial position of cutter feeding can be obtained by inputting A1, B1, C1, A2, B2, C2, OD1 and OD2 after the calculation method is written into a program, operation is easy, the requirement of workers is lowered, and production efficiency is improved.

METHOD FOR PREPARING FERROTITANIUM ALLOY BASED ON ALUMINOTHERMIC SELF-PROPAGATING GRADIENT REDUCTION AND SLAGGING REFINING

Disclosed is a method for preparing a ferrotitanium alloy based on aluminothermic self-propagating gradient reduction and slagging refining, the method comprising: (1) carrying out aluminothermic self-propagating gradient reduction by means of a first method, wherein raw materials are divided into several batches, the first batch of materials is put into a reaction furnace and is ignited with a magnesium powder from the top of the materials so as to initiate a self-propagating reaction, and the other batches of materials are successively added until the reaction is complete; or carrying out aluminothermic self-propagating gradient reduction by means of a second method, wherein raw materials other than aluminum powder are mixed until uniform and added into a continuous mixer at a uniform flow rate, the aluminum powder is added into the continuous mixer at a flow rate decreasing at a gradient, and the uniformly mixed raw materials are simultaneously continuously introduced into the reaction ...

Interventional therapy guiding method and system based on multi-modal image fusion

The invention provides an interventional therapy guiding method and system based on multi-modal image fusion. The method comprises the steps that the minimum three-dimensional bounding box of the abdomen of a patient is detected from CT/MR three-dimensional data; sequentially extracting a skin area, a lesion area, a blood vessel area and a rib area from the minimum three-dimensional bounding box; planning a needle insertion path based on the skin area, the lesion area, the blood vessel area and the rib area; based on the needle inserting path, extracting a two-dimensional key image from the CT/MR three-dimensional data; an ultrasonic B image of the abdomen of the patient is collected and registered with the two-dimensional key image; and performing first guidance based on the registration result. According to the method, a series of preoperative planning operations are performed on the CT/MR image, and the two-dimensional ultrasonic image and the three-dimensional CT/MR image are fused, ...

Asphalt self-repairing microcapsule numerical simulation method based on dual-scale coupling

The invention discloses an asphalt self-repairing microcapsule numerical simulation method based on dual-scale coupling. The asphalt self-repairing microcapsule numerical simulation method comprises the following steps: S1, micro-morphology distribution analysis of a self-repairing asphalt mixture blended with microcapsules; s2, representative volume unit generation and pavement macro-micro coupling model construction; s3, calculating and simulating the contact breakdown of the outer wall of the microcapsule under the action of the microcracks; s4, performing characterization conversion on the wetting filling and curing repairing numerical values of the microcapsule core material; and S5, evaluating the repairing effect of the asphalt self-repairing microcapsule. The method provides important technical support and guarantee for deep analysis of mechanical response characteristics of the asphalt self-repairing microcapsule in a real pavement structure on a mesoscopic level and evaluation ...

Illumination control system based on intelligent switch application

The invention discloses an illumination control system based on intelligent switch application, and relates to the technical field of illumination control systems, the illumination control system comprises a camera and a household server, the camera is connected with the household server, a picture input module is connected with a picture processing module, a learning summary module is connected with a storage module, and the storage module is connected with a display module. The storage module is connected with a processing module, the processing module is further connected with a light recording module, the light recording module is connected with an adjusting module, and the adjusting module is connected with a lighting module. According to the illumination control system based on the intelligent switch application, by learning and summarizing living habits of family members and combining real-time light brightness, a light scheme can be accurately adapted to the living habits of each ...

METHOD FOR BAYER PROCESS RED MUD BACKFILLING

A method for Bayer process red mud backfilling, comprising the following steps: mixing red mud produced from a Bayer process for producing aluminum oxide with calcium carbide slag and water produced in a polyvinylchloride production process, after a thermally-insulated reaction and solid-liquid separation, a liquid phase is returned to a Bayer process system, and a solid phase is treated by being added with a gel, then transformed into silicate gel, and serves as a mine filler for use in backfilling. This implements the comprehensive treatment of the red mud from the Bayer process and the calcium carbide slag, and, the treated red mud directly undergoes a backfilling treatment, thus solving the problem with the storage of the red mud and calcium carbide slag of the Bayer process, providing great environmental protection and economic significance.

Tunnel anchorage holes hole bottom cisoid reaming device

... 本实用新型公开了种巷道锚固孔孔底顺向扩孔装置，包括刀片安装座、移动方杆、刀片、刀片顶块、移动套、支撑连杆、连杆支撑座、扩孔钻杆和扩孔尾杆，所述刀片安装座与移动方杆焊合固连，所述刀片顶块设置在移动套的两侧，所述移动套与连杆支撑座前端固连，所述移动方杆安装在移动套内，所述刀片的尾端与刀片安装座铰接，所述刀片的前端与支撑连杆的前端铰接，所述支撑连杆的尾端与连杆支撑座铰接，所述连杆支撑座与扩孔钻杆固连，所述扩孔钻杆的后端固连有扩孔尾杆；本实用新型提高巷道锚固剂与扩孔部分围岩的剪切力，增加锚固系统抗拉拔力，对控制锚杆支护类巷道围岩变形、破坏具有重大意义。 ...

Method for laser cutting substrate and laser cutting device

The invention provides a substrate laser cutting method and a laser cutting device, and the method comprises the steps that laser emitted by a laser source is focused on a substrate, different material layers on the substrate generate different reflection spectrum signals, and the reflection spectrum signals are sent to a spectrum analysis unit; the spectrum analysis unit compares the reflection spectrum signal with a standard spectrum, calculates respective corresponding refractive indexes and extinction coefficients of different material layers of the substrate, and simulates a material distribution three-dimensional model on the substrate according to the respective corresponding refractive indexes and extinction coefficients; and selecting corresponding laser cutting parameters to cut the substrate according to the material distribution on the substrate. According to the refractive indexes and extinction coefficients corresponding to the different material layers of the substrate, the ...

LARGE VISUAL DIRECT SHEAR TEST PLATFORM FOR SOLID FILLING MATERIALS

A large visual direct shear test platform for solid filling materials, the test platform consisting of a reaction frame, a tamper (4), a loading system, a shear system, and a data monitoring system. The tamper (4) can simulate the tamping process of solid filling materials (30) after filling goaf during the process of solid filling and coal mining. The systems cooperate with one another, such that a large direct shear test can be carried out on the tamped solid filling materials (30), and a large confined compression test can also be performed; relevant data in the test process can be collected to obtain results, i.e. a shear strength parameter, stress-strain characteristics and creep characteristics, of the tamped solid filling materials (30); in addition, the movement and breaking conditions of particles of the solid filling materials (30) and the development process of a shear zone can be observed throughout the whole test process. The platform has a simple structure and various functions ...

Sand baffle structure of core setting mould

The invention relates to the technical field of casting, and discloses a core setting mould sand blocking plate structure which comprises a core setting mould, a plurality of sand blocking assemblies are arranged on the core setting mould, each sand blocking assembly comprises a mounting block and a plurality of sand blocking plates arranged on the outer side of the mounting block, and fixed connection blocks fixed to the outer sides of the mounting blocks are hinged to the bottoms of the sand blocking plates. Mounting grooves are formed in the sides, close to the sand baffles, of the mounting blocks, and a plurality of connecting springs with the other ends fixed to the adjacent sand baffles are fixed to the inner walls of the mounting grooves. The sand core can be supported and limited, the sand blocking plate can shift along with the shape of the sand core, the sand blocking plate can be flexibly regulated and controlled, the flexibility is high, and use is convenient.

Road water-stable base cracking performance prediction method based on neural network learning

The invention discloses a road water-stable base cracking performance prediction method based on neural network learning, and the method comprises the following steps: firstly, carrying out the CT scanning of a cement-based test piece, carrying out the segmentation and three-dimensional reconstruction of an image through software, and calculating the orientation distribution index and void ratio of each particle size of the test piece; secondly, the model is imported into ABAQUS for a uniaxial tension and compression numerical test, and the compression modulus and the tensile modulus of the model are obtained; thirdly, constructing a neural network model, and training by taking the orientation distribution index and void ratio of each particle size of the test piece as input data and taking the compression modulus and the tensile modulus as output data; and finally, performing core drilling and sampling on the cracked road section of the semi-rigid base, performing scanning reconstruction ...

High-speed N95 or KN95 mask sealing equipment

The invention provides high-speed N95 or KN95 mask sealing equipment. The high-speed N95 or KN95 mask sealing equipment comprises a rack, a feeding system, a welding machine, a material returning module and a control module, wherein the feeding system, the welding machine, the material returning module and the control module are all mounted on the rack; the feeding system is arranged on the plane of the machine frame and provided with a plurality of positioning dies, the welding machine is arranged above one positioning die of the feeding system, and the material returning module is arranged above the other positioning die. And the control module is electrically connected with the feeding system, the welding machine and the material returning module. According to the sealing equipment provided by the invention, rapid feeding of the to-be-sealed mask is realized through the feeding system arranged on the rack, so that the production cycle of a single product is shortened; the mask is conveyed ...

Road surface recessive disease detection method and system based on deep learning and ground penetrating radar

The invention belongs to the field of pavement detection, and provides a pavement recessive disease detection method and system based on deep learning and ground penetrating radar, and the method comprises the steps: obtaining a pavement ground penetrating radar image, and carrying out the preprocessing; based on the pre-processed road surface ground penetrating radar image, road surface recessive disease detection is carried out by using a pre-trained depth region suggestion network model; wherein the deep region suggestion network model comprises two convolution pooling layers, two convolution layers, one layer of interest, one layer of ROI pooling layer and two output layers which are connected in sequence; the convolution pooling layer is composed of a convolution layer and a pooling layer; the layer of interest is used for generating local features from feature maps generated by the convolution layer and the convolution pooling layer, and then the ROI pooling layer is used for normalizing ...

Soil matrix compaction degree measuring method and device based on air coupling ground penetrating radar

The invention discloses a soil matrix compaction degree measuring method and device based on an air coupling ground penetrating radar. The method comprises the steps that the dielectric constant of a soil matrix at the current position is calculated in real time through an air coupling ground penetrating radar system; correlating the soil-based dielectric constant with the measurement position through a GPS positioner; and the compaction degree of the soil foundation is calculated through a real-time compaction degree feedback display, and two-dimensional compaction degree distribution data of the soil foundation in the site are drawn. Compared with the prior art, the continuous, real-time and nondestructive testing of the compaction degree of the soil foundation is realized, the visual display of the compaction degree distribution is realized in the display, an operator is further guided to optimize a compaction path on site, and the device and the method have important guiding significance ...

METHOD FOR PREPARING FERROVANADIUM ALLOY BASED ON ALUMINUM THERMAL SELF-PROPAGATION GRADIENT REDUCTION AND SLAG WASHING AND REFINING

A method for preparing a ferrovanadium alloy based on aluminum thermal self-propagation gradient reduction and slag washing and refining, comprising: (1) aluminum thermal self-propagation gradient reduction: a first scheme, raw materials are divided into several batches, a first batch of a material is fed into a reaction furnace, magnesium powder is ignited at the top of the material to induce a self-propagating reaction, and other batches of materials are added successively until completely reacted; a second scheme: raw materials other than aluminum powder are mixed evenly and added at a uniform flow rate into a continuous mixer, at the same time, aluminum powder is added at flow rates of decreasing gradient into the continuous mixer, the evenly mixed raw materials are simultaneously and continuously introduced into a reaction furnace for an aluminum thermal self-propagation reaction until all of the raw materials are completely reacted; (2) insulated smelting to produce an upper layer ...

Salvage method for underwater sealed cabin inflation floating

The salvage method comprises the steps that a diver finds and measures the damaged position of an accident ship, the size of a cabin sealing steel plate is prefabricated according to the finds and measured data, the cabin sealing steel plate outside the cabin is installed and fixed, the edge of the cabin sealing steel plate is sealed, the damaged cabin is inflated to lower the water level, and the buoyancy posture of the ship body is restored to be stable. The inflation hole and the drainage port are formed in the bottom of the damaged cabin, the inflation pipe inflates compressed air into the bottom of the repaired cabin, seawater leaking into the cabin is squeezed out till the ship body recovers buoyancy, and the ship body floats stably. According to the invention, plugging and inflatable floating of the large damaged ship are realized, floating salvage of the damaged ship is completed without support of a large floating crane engineering ship, the efficiency is high, and the cost is ...

Structure and method for increasing exhaust of water jacket sand core

The invention relates to the technical field of water jacket sand cores, in particular to a structure and method for increasing exhaust of a water jacket sand core, and provides the following scheme for solving the problems that in the prior art, an exhaust structure of the water jacket sand core is low in exhaust speed and inconvenient to use, the structure comprises a water jacket core and an exhaust mechanism, and the water jacket core is provided with a plurality of exhaust channels; large-size auxiliary core heads are fixed to air outlets of the exhaust channels, and detachable outer mold exhaust needles are installed on the multiple auxiliary core heads; the exhaust mechanism comprises a fixing pipe, a plurality of connecting pipes and a plurality of branch pipes fixed to the fixing pipe. A large-size auxiliary core head is additionally arranged on a small core head structure in the prior art, meanwhile, an exhaust channel is formed for a sand outlet hole and a thick and large structure ...

METHOD FOR PREPARING HIGH MELTING POINT METAL POWDER VIA MULTI-STAGE DEEP REDUCTION

A method for preparing a high melting point metal powder via multi-stage deep reduction, said method comprising: mixing a dried high melting point metal oxide powder with a magnesium powder, and performing a self-propagating reaction to obtain a high melting point metal Me, specifically one or more of W, Mo, Ta, Nb, V, Zr, Hf and Re; placing the intermediate product in a sealed reaction vessel, and using hydrochloric acid as a leaching solution to perform leaching to obtain a low valent oxide MeXO precursor of a low valent high melting point metal; mixing evenly with a calcium powder, pressing, placing in a vacuum reduction furnace, heating to 700-1200°C, performing deep reduction for 1-6 hours, using hydrochloric acid as a leaching solution to perform leaching on the deep reduction product, and treating to obtain a high melting point metal powder.

METHOD FOR PREPARING REDUCED TITANIUM POWDER BY MULTI-STAGE DEEP REDUCTION

Disclosed is a method for preparing a reduced titanium powder by multi-stage deep reduction, belonging to the technical field of milling. The method comprises: a dried titanium dioxide powder and a magnesium powder are uniformly mixed, and are added to a self-propagating reaction furnace to initiate a self-propagating reaction, in order to obtain an intermediate product with the low-valent titanium oxide TixO dispersed in the MgO matrix; and the intermediate product is subjected to leaching with hydrochloric acid as a leaching solution, and is then filtered, washed, and vacuum-dried to obtain a low-valent titanium oxide TixO precursor; the low-valent titanium oxide TixO precursor is uniformly mixed with a calcium powder, is pressed and placed in a vacuum reduction furnace, and is subjected to secondary deep reduction; and the deep reduction products are leached with hydrochloric acid as a leaching solution to obtain a reduced titanium powder. The method has the advantages of low raw material ...

ALUMINUM THERMAL SELF-PROPAGATION GRADIENT REDUCTION AND SLAG WASHING AND REFINING-BASED METHOD FOR PREPARING TITANIUM ALLOY

An aluminum thermal self-propagation gradient reduction and slag washing and refining-based method for preparing a titanium alloy, which relates to the technical field of titanium aluminum alloys. The method comprises: pre-treating raw materials; weighing the raw materials according to the following mass ratio: rutile or high titanium slag or titanium dioxide:aluminum powder:V2O5 powder:CaO:KClO3 ＝ 1.0:(0.60-0.24):(0.042-0.048):(0.12-0.26):(0.22-0.30); using a manner of gradient feeding to perform an aluminum thermal self-propagation reaction so as to obtain a high-temperature melt; performing gradient reduction smelting; after feeding is complete, performing thermal insulation melting; then adding CaF2-CaO-TiO2-V2O5-based refining slag into the high-temperature melt; performing slag washing and refining; and finally removing the slag to obtain a titanium alloy. The method has the advantages of having a short process, consuming little energy, being simple to operate, the contents of Al ...

Belt body abrasion resistance detection device for flame-retardant rubber conveying belt

The invention relates to the technical field of conveyor belt performance detection, and particularly provides a belt body abrasion resistance detection device for a flame-retardant rubber conveyor belt. Comprising a detection platform and a multi-mode detection device. A belt conveyor is fixed on the detection platform; the multi-mode detection device comprises an overall lifting mechanism, the overall lifting mechanism comprises a lifting plate arranged above the belt conveyor in a lifting mode, and a first detection mechanism, a second detection mechanism and a third detection mechanism are assembled at the bottom end of the lifting plate; when the device provided by the invention is used for detecting the rubber conveying belt, a detection mode of directly carrying out simple contact friction during traditional abrasion resistance detection is changed, the abrasion states of the rubber conveying belt in various conveying states can be better and truly reflected, and the overall abrasion ...

Internal -combustion engine piston ring set

... 本实用新型提供种内燃机活塞环组件。所述冶金活塞环组件包括上、下活塞环，其特征在于：所述上、下活塞环分别由两片半圆环对接而成，两活塞环上下重叠，且上、下活塞环的半圆环对接口相互错位，在重叠后的上、下活塞环内壁嵌设有弹性定位垫片，弹性定位垫片的高度大于下活塞环的厚度，在弹性定位垫片与上下活塞环内壁的接触面设有上定位凸片和下定位凸片，上定位凸片对应插入上活塞环的其中个半圆环对接口内，下定位凸片对应插入下活塞环的其中个半圆环对接口内。本活塞环安装、维修方便，密封性好，可以提高燃油发动机功率、减少油耗和降低排放污染。 ...

ALUMINUM THERMAL SELF-PROPAGATION GRADIENT REDUCTION AND SLAG WASHING AND REFINING-BASED METHOD FOR PREPARING TUNGSTEN-IRON ALLOY

Provided in the present invention is an aluminum thermal self-propagation gradient reduction and slag washing and refining-based method for preparing a tungsten-iron alloy, comprising: (1) aluminum thermal self-propagation gradient reduction: a first manner comprising raw materials being divided into several batches, and a first batch of materials being placed into a reaction furnace, magnesium powder then being ignited from a top portion of the materials so as to initiate a self-propagation reaction, while the other batches of materials are added sequentially until the reaction is complete; the second manner comprising raw materials other than aluminum powder being uniformly mixed and added into a continuous mixer at a uniform flow rate, while the aluminum powder is added into the continuous mixer at a graded decreasing flow rate, the mixed raw materials then being continuously introduced into a reaction furnace to carry out an aluminum thermal self-propagation reaction until all of the ...

Asphalt pavement rut evaluation and maintenance decision-making system based on digital twinning

The invention discloses an asphalt pavement rut evaluation and maintenance decision-making system based on digital twinning. The method comprises the following steps: S1, constructing a pavement twinning model based on road parameter data; s2, integrating vehicle characteristic data acquired in real time into a twin model; s3, establishing a twin model and finite element model data synchronous interaction interface, and simulating based on the vehicle load data updated in real time to obtain rut development process data; s4, calculating an RDI time history curve; and S5, dividing preventive maintenance time periods according to the curve and formulating a maintenance scheme. The system comprises a vehicle characteristic data acquisition module, a pavement twinborn model construction module, a track simulation module and a track maintenance scheme making module. According to the method and the system, the road parameter information, the real-time vehicle load and the rut data can be presented ...

Intrusive permanent magnet paddle motor and permanent magnet paddle

The invention provides an intrusive permanent magnet paddle motor which comprises a fixed shaft, a motor stator and a motor rotor, the motor stator is arranged on the fixed shaft and is fixed relative to the fixed shaft, a winding is arranged on the motor stator, epoxy resin is filled on the winding for packaging, and the motor rotor is arranged on the fixed shaft. The motor rotor is arranged around the motor stator and can rotate relative to the motor stator, a permanent magnet is arranged on an inner cavity of the motor stator, the motor stator is internally arranged and fixed, and the motor rotor rotates around the motor rotor, so that external rotation driven by the motor is realized, and paddles are arranged between the left motor and the right motor in a surrounding manner. The left motor and the right motor rotate to drive the blades to rotate and regularly flap swimming pool water to form waves, and meanwhile, the swimming pool water is regularly flapped to form resonance to form ...

Device and method for realizing ultrasonic imaging control and display

The invention provides a device and method for achieving ultrasonic imaging control and display, and the method comprises the steps: placing an ultrasonic probe at a corresponding part of the body of a detected person, transmitting ultrasonic waves, and receiving echo signals; the ultrasonic control and imaging unit calculates and processes the echo signal, converts the echo signal into an ultrasonic image, and transmits the ultrasonic image to the ultrasonic display screen for display; the eye movement tracking device collects eyeball movement information of the user when the user views the ultrasonic image; the eye movement tracking unit calculates the eyeball movement information to obtain a visual focus of the user, and determines a region of interest of the user in the ultrasonic image according to the visual focus; and the ultrasonic control and imaging unit is used for determining a first adjustment parameter according to the region of interest of the user, generating a first target ...

360-degree rotary cutting bridge breaking weighing device

The invention provides a 360-degree rotary cutting bridge breaking weighing device. The 360-degree rotary cutting bridge breaking weighing device comprises a rack; a stirring chamber; the stirring cavity is arranged on the rack; a feeding cavity; the feeding cavity is communicated with the stirring cavity; the bridge breaking stirring device is provided with an annular driving motor and stirring blades, the driving motor is arranged between the feeding cavity and the stirring cavity, the driving motor is provided with a shell, a stator and an annular rotor, the shell is provided with an annular inner cavity, the inner cavity is provided with a sliding groove with an opening towards the center, the stator is fixedly installed on the inner cavity, and the stirring blades are fixedly installed on the inner cavity. The stator is provided with an annular stator iron core and a winding, and the winding is arranged around the stator iron core; the annular rotor is arranged in the center of the ...

Reinforcing agent, hydraulic transmission oil and vehicle automatic transmission

The invention provides a reinforcing agent, hydraulic transmission oil and a vehicle transmission. The reinforcing agent comprises the following components in percentage by mass: 10-15% of a dispersing agent; 70-80% of an ionic liquid; and the balance of base oil. Wherein the ionic liquid comprises a structure as shown in a formula 1. The reinforcing agent disclosed by the invention is simple in composition and environment-friendly, and when the reinforcing agent is used for preparing the hydraulic transmission oil, the hydraulic transmission oil still has relatively excellent friction performance after being circulated for multiple times.

Method for extracting scattered element lithium from Bayer process sodium aluminate solution

The invention relates to a method for enriching and extracting dispersed element lithium from a sodium aluminate solution in an aluminum oxide factory, which is characterized in that lithium dissolved in Bayer mother liquor in the aluminum oxide factory is adsorbed and extracted by utilizing the excellent ion adsorption characteristic of layered aluminosilicate minerals according to the low solution loss of layered clay minerals in the sodium aluminate solution before seed precipitation; and then the lithium-rich layered aluminosilicate minerals are desorbed by using organic acid, the desorbed blank layered aluminosilicate minerals can be circularly adsorbed and utilized, and the lithium citrate solution can be directly used as a raw material for preparing the anode of the lithium battery. According to the method, high-efficiency, low-pollution and low-cost extraction of lithium is realized, and a feasible technical route for comprehensive utilization of resources and improvement of economic ...

Portable quick dismounting and mounting device for underground stand column

The invention relates to a portable down-hole stand column rapid dismounting and mounting device which comprises a dismounting and mounting mechanism, an auxiliary mechanism and a rapid dismounting and connecting mechanism, and the dismounting and mounting mechanism comprises a plurality of connecting blocks, a straight connecting rod, a diagonal draw bar, a jack and a ratchet wheel assembly; a reserved parallel space for installing a jack is formed between the upper diagonal draw bar and the lower diagonal draw bar, the tail of the jack is connected with the connecting block through a quick-release connecting mechanism, a jack cylinder barrel penetrates through the parallel space formed by the upper diagonal draw bar and the lower diagonal draw bar, and the free end of a jack push rod is in pin joint with the ratchet wheel assembly through a pin shaft mechanism. The four jacks are fixedly connected in sequence to form an annular telescopic structure, and the four jacks stretch out and ...

Road deformation type disease detection method and system based on single-line laser point cloud

The invention discloses a road deformation type disease detection method and system based on single-line laser point cloud.The method comprises the steps that firstly, poses of an unmanned aerial vehicle at different moments are recorded, road point cloud data in a cross section form are collected by a laser radar, and then a road surface reference cross section is fitted; fitting a road reference surface model and a road curved surface model, determining a disease point cloud position, and dividing a 10m road surface area; and finally, calculating the maximum depth and deformation volume parameters of the disease from a three-dimensional angle, drawing up an index and evaluating the deformation type disease of the road. According to the method, the depth of the deformation type diseases is calculated from the three-dimensional perspective, compared with traditional pavement deformation type disease detection, higher precision is achieved, three-dimensional evaluation indexes of the pavement ...

Sand mold structure based on 3D printing and overall combination method

The invention relates to the field of molds, and discloses a sand mold structure based on 3D printing and an overall combination method.The sand mold structure comprises a lower mold core, positioning columns are integrally formed on the two sides of the lower mold core, and core assembly bolts are connected to the positioning columns; the upper mold core is connected with the core assembly bolt, a plurality of overflow holes I are formed in the upper mold core, and overflow columns are connected to the overflow holes I; the riser groove is connected with riser cores, and a sprue core connected with the upper mold core is arranged between the two riser cores; the sprue core, the riser core and the overflow column are designed in a split mode, the sand mold covering size of the top of a casting can be effectively reduced while a high pressure head is obtained, and the sprue core, the riser core and the overflow column have the structural characteristics of being light in weight, large in ...

Intelligent airport pavement state detection method based on image recognition

The invention discloses an airport pavement state intelligent detection method based on image recognition, which comprises the following steps of: arranging photoelectric equipment, acquiring an airport pavement full-range image, preprocessing, acquiring an airport pavement image in sunny weather for airport pavement diseases, adopting a real-time video image for FOD, and adopting a pavement image in rainy, snowy and icy weather for rainy, snowy and icy conditions; and the friction coefficient adopts a pavement picture in clear weather without diseases and FOD (Foreign Object Deposition). And then designing an airport pavement state identification model to obtain specific attributes of the airport pavement state. Wherein a YOLO-Airport deep neural network recognition algorithm is adopted for airfield pavement diseases, FOD and rain, snow and ice states, and point cloud is adopted for the friction coefficient to reconstruct the three-dimensional texture of the airfield pavement. According ...

Lubricating oil additive and lubricating oil

The invention provides a lubricating oil additive and lubricating oil. The lubricating oil additive provided by the invention comprises the following components in percentage by mass: 1.5-3% of a detergent; 50-80% of a dispersant; 3.5-5% of an anti-wear agent; 2%-10% of ionic liquid; 5%-6% of an antioxidant; 1%-2% of an antirust agent; 0.1%-0.6% of a metal deactivator; and the balance of base oil. Wherein the ionic liquid comprises a structure as shown in a formula 1, and n is a positive integer selected from 4-9. The lubricating oil additive disclosed by the invention has relatively excellent wear resistance, corrosion resistance, flowability, stability and environmental friendliness at the same time.

Bituminous pavement road overall-layering-interlayer structure state evaluation method

The invention discloses an asphalt pavement road overall-layering-interlayer structure state evaluation method, and belongs to the field of road structure bearing capacity evaluation indexes. The method comprises the following steps: obtaining an actually measured modulus value of each horizon by virtue of a nondestructive testing technology, constructing various evaluation indexes of a road overall-layering-interlayer structure state, and realizing 'five-division' evaluation on the structure state of each horizon through a calculation method. According to the asphalt pavement road overall-layering-interlayer structure state evaluation method provided by the invention, mechanical response quantities selected by a structure evaluation index and a design index are unified, a road structure state evaluation index based on a new design index is constructed, and an integration concept of road structure design and evaluation is met.

Mask production equipment feeding system

The utility model provides a feeding system of mask production equipment. The feeding system of the mask production equipment comprises a fixed tray, an index plate arranged in the fixed tray, a plurality of positioning dies evenly arranged on the index plate, a pre-pressing module fixed to the production equipment and a control circuit. And the output end of the control circuit is electrically connected with the control end of the index plate and the control end of the pre-pressing module. According to the feeding system of the mask production equipment, the rotating speed of the index plate is set through the control circuit, and masks to be sealed are placed in the positioning mold one by one by workers; through rotation of the index plate, the mask is brought to the position below an ultrasonic welding machine mold of production equipment, the mask is pre-pressed through the pre-pressing module, the mask is accurately positioned, sealing operation is conducted through the ultrasonic ...

Asphalt pavement structure rut deformation monitoring method based on intelligent particles

The invention discloses an asphalt pavement structure rut deformation monitoring method based on intelligent particles. The method comprises the following steps: S1, constructing an intelligent particle three-dimensional numerical model; s2, constructing an asphalt layer characteristic partition model under asphalt pavement rut deformation according to the stress-deformation state; s3, on the basis of judging the feature partitions, constructing a space-time correlation model of the intelligent particle monitoring information and the rut depth by adopting a grey correlation analysis method; and S4, an actual pavement burying scheme of the intelligent particles is determined, and actual monitoring pose evolution information under the pavement rutting behavior is obtained. The intelligent particle sensor device has the characteristics of small size, high precision, abundant monitoring data types, no damage to the original structure of the road surface, self power supply and self adaptation ...

Amphibious geological drilling platform

The invention discloses an amphibious geological drilling platform, and belongs to the field of drilling equipment, the amphibious geological drilling platform comprises an amphibious working platform, and one side of the upper surface of the amphibious working platform is fixedly connected with a coring mechanism; a storage mechanism is fixedly connected to one side of the upper surface of the amphibious working platform and located on one side of the coring mechanism. A coil winder is arranged in the middle of the upper surface of the amphibious working platform, and a drilling unit is fixedly connected to one side of the upper surface of the amphibious working platform; a measuring mechanism is arranged in the middle of the upper surface of the amphibious working platform and connected with the coil winder. By means of the technical scheme, the working intensity of workers can be reduced, the working efficiency can be improved, meanwhile, the drill rod is convenient to store after the ...

Copper tailing-slag-based geopolymer for rigid concrete pavement and preparation process of copper tailing-slag-based geopolymer

The invention discloses a copper tailing-slag-based geopolymer for a rigid concrete pavement and a preparation process of the copper tailing-slag-based geopolymer, and relates to the technical field of industrial solid waste resource utilization and environmental protection. 15 to 20 parts of a copper tailing-slag geopolymer; and 10 to 15 parts of water. The aggregate comprises the following material components in parts by mass: 56-60 parts of coarse aggregate; and 40-44 parts of fine aggregate. The copper tailing-slag geopolymer comprises the following substance components in parts by mass: 4-6 parts of copper tailings; 4-6 parts of slag; 3-4 parts of an alkali activator; and 2.8 to 3.2 parts of water. The copper tailing-slag geopolymer is used for replacing cement to serve as a gel material to be applied to a rigid concrete pavement, on the basis that the performance of the road cementing material is guaranteed, the using amount of cement in engineering is reduced, the influence of a ...

Large-area goaf spontaneous combustion multi-source information monitoring and early warning system and method

The invention discloses a large-area goaf spontaneous combustion multi-source information monitoring and early warning system and method, and belongs to the technical field of coal mine safety monitoring, and the system comprises a wireless monitoring subsystem, a wireless monitoring host substation, an intelligent analysis software subsystem and a mobile network terminal. The wireless monitoring subsystem monitors environment parameters of the large-area goaf in real time; the wireless monitoring host substation is used for connecting ground and underground industrial ring networks and establishing wireless monitoring data transmission with the intelligent analysis subsystem in real time; the intelligent analysis subsystem is responsible for analysis and arrangement of monitoring information and early warning grade division, and sends an early warning grade value to the mobile network terminal. The method overcomes the problem of data redundancy of coal spontaneous combustion monitoring ...

Automatic track deformation monitoring system and monitoring method thereof

The embodiment of the invention provides an automatic track deformation monitoring system and a monitoring method thereof, and the automatic track deformation monitoring system comprises a target, video acquisition equipment and a post-processing system. The target is used for being arranged on a steel rail of a track. And the video acquisition equipment is located outside the railway boundary, is arranged towards the target and is used for acquiring coordinate information of the target. And the post-processing system is in communication connection with the video acquisition devices, and the post-processing system is used for determining the shape of the steel rail according to the coordinate information of the targets. The target is directly arranged on the steel rail, can directly reflect basic data of rail deformation, and does not affect driving safety. According to the monitoring system, dynamic monitoring and continuous monitoring are achieved, the real change condition of the track ...

Double-station sand core combined clamp

The invention discloses a double-station sand core combined clamp, and relates to the technical field of clamps. Comprising a base; the cylinder hole core positioning assembly is located in the middle of the base; the cap core positioning assemblies are located on the front side and the rear side of the cylinder hole core positioning assembly; the side core positioning assemblies are located on the left side and the right side of the cylinder hole core positioning assembly; and the moving assembly comprises a linear guide rail and an air cylinder, the linear guide rail is installed below the cap core positioning assembly and the side core positioning assembly, and the air cylinder is used for driving the cap core positioning assembly and the side core positioning assembly to move towards the cylinder hole core positioning assembly. The clamp provided by the invention is simple in structure, convenient to operate, accurate in positioning and convenient to maintain, the core assembly clamp ...

Integrated grouting device and method for weak cementation roadway surrounding rock drilling and grouting reinforcement

The invention discloses an integrated grouting device and method for weak cementation roadway surrounding rock drilling grouting reinforcement, and relates to the technical field of roadway surrounding rock reinforcement. The integrated grouting device comprises a machine body, a supporting plate is rotationally installed on the side face of the machine body, a movable frame is slidably installed on the side face, away from the machine body, of the supporting plate, and a connecting rod is rotationally installed in a bottom plate of the movable frame; a rotating disc is rotatably mounted on the outer surface of the connecting rod, a limiting block is fixedly mounted on the lower surface of the rotating disc, and a drill rod is detachably mounted in the limiting block. The screw rod drives the moving rod to move front and back to enable the connecting rod to deflect, so that the angle of the drill rod is adjusted, and the rotating machine drives the connecting rod to rotate, so that the ...

Device and method for measuring depth of artificial texture structure by using sanding method

The invention discloses a device and method for measuring the depth of an artificial texture structure by using a sanding method, the device comprises a rectangular plate groove, the periphery of the rectangular plate groove is provided with surrounding plates, the surrounding plates comprise n adjacent fixed surrounding plates and 4-n movable surrounding plates, and n is equal to 2 and 3; the surface of the rectangular plate groove is provided with a movable groove channel allowing the movable surrounding plate to move horizontally. A plurality of sand leakage holes are further formed between the rectangular plate groove and the movable surrounding plate; the method comprises the following steps: fixing an artificial texture pavement slab in a rectangular slab groove; the volume of sand on the artificial texture pavement slab is measured through a sand paving method, and redundant sand is collected in the sand tank through the sand leaking holes; and calculating the construction depth ...

Shell fragment seals piston ring set

... 本实用新型提供种弹片封口活塞环组件。所述弹片封口活塞环组件包括活塞环和重叠置于活塞环下方的环形封口弹片，所述环形封口弹片与活塞环适配，在环形封口弹片的外缘设有多个向外凸出的圆弧支撑片，在环形封口弹片对应活塞环开口处设有定位凸块，并在活塞环与环形封口弹片重叠后，定位凸块插入活塞环的开口中。本活塞环安装、维修方便，密封效果好，可以提高燃油发动机功率、减少油耗和降低排放污染。 ...

Bituminous pavement structure combination automatic design generation method based on BIM

The invention discloses a BIM-based bituminous pavement structure combination automatic design generation method. The method comprises the following steps: constructing a bituminous pavement structure combination design scheme rule base; automatically generating a pavement structure combination initial design scheme based on the rule base; constructing a pavement structure parameterized model based on the BIM; establishing a data interaction module of the BIM model and simulation analysis software; analyzing and calculating the current pavement structure in the simulation analysis software to obtain a response result; checking calculation of a pavement structure design scheme based on BIM; analyzing and evaluating the use performance index and the economic index based on the BIM; automatically generating a next group of schemes, and repeating iterative optimization to obtain a non-inferior solution scheme set; and selecting the most suitable scheme for modeling. The method is used for realizing ...

Highway vehicle speed early warning method under extreme rainwater weather based on digital twinborn

The invention discloses a highway speed early warning method under extreme rainwater weather based on digital twinning. The method comprises the following steps: S1, road state detection based on a vehicle-mounted three-dimensional laser road surface detection system; s2, real-time measurement and transmission of rainwater parameters based on a microwave detection technology; s3, establishing a digital information model based on multi-source data fusion; s4, establishing data interaction between the digital information model and simulation software; s5, carrying out simulation analysis on an attachment coefficient model based on multi-source data fusion; s6, maximum safe driving speed simulation deduction under different working condition combinations is carried out; and S7, vehicle speed real-time early warning based on digital twinning. According to the invention, a vehicle speed early warning system is established for vehicles running on the highway under extreme rainwater weather based ...

Asphalt pavement semi-rigid base crack monitoring method based on intelligent perception

The invention discloses an asphalt pavement semi-rigid base crack monitoring method based on intelligent perception, which is characterized in that intelligent particles integrated by a resistive sensor are buried in an asphalt pavement semi-rigid base to acquire mechanical response of a pavement structure, and monitoring of base cracks is realized. The method comprises the following steps: calibrating a conversion relationship between macro and micro parameters based on a uniaxial tension and compression simulation experiment, and establishing a cross-scale pavement model by adopting a finite element-discrete element coupling method; the method comprises the following steps of: tracking and positioning a base crack through numerical simulation of base crack evolution in combination with a fracture mechanics I-II type composite crack Westergard complex variable function method; burying intelligent particles in a pavement model base layer for information acquisition, and realizing matching ...

Airfield pavement snow thickness measuring method based on binocular stereoscopic vision

The invention discloses an airport pavement area snow thickness measuring method based on binocular stereo vision, comprising the following steps: S1, extracting image feature points, and matching the feature points; s2, a disparity map is obtained according to feature point matching, isolated point noise filtering processing is carried out on the three-dimensional point cloud, noise points are deleted, and denoised pavement point cloud coordinates are obtained; s3, calculating an overall normal vector of the detection area; and S4, calculating the coordinate difference of the point clouds Z on the front surface and the rear surface of the accumulated snow in the same grid area, and sending out a corresponding early warning signal based on the accumulated snow thickness obtained through point cloud calculation and a preset early warning level. According to the method, the snow accumulation condition of the airport pavement can be remotely monitored, manual measurement is replaced, the workload ...

Negative-pressure vibrating screen for slurry treatment

The invention discloses a negative pressure vibrating screen for slurry treatment, and relates to the field of slurry treatment, the negative pressure vibrating screen comprises a rack, a screening mechanism is connected in the rack through a buffer mechanism, a vibrating assembly is arranged above the screening mechanism, and a negative pressure mechanism is arranged at the bottom of the screening mechanism; a sealing mechanism is arranged between the negative pressure mechanism and the screening mechanism; the screening mechanism comprises a screen frame, a coarse-mesh screen is installed on the upper portion of the screen frame, a fine-mesh screen is arranged below the coarse-mesh screen, and an air injection assembly is arranged below the fine-mesh screen. The sealing mechanism is arranged between the negative pressure mechanism and the screening mechanism, the sealing performance of the connecting position of the adsorption cover and the screen frame is effectively guaranteed, and ...

Method for acquiring ultrasonic data at high speed based on PCIe interface

The invention provides a PCIe interface-based method for acquiring ultrasonic data at a high speed. The method comprises the following steps: during the initialization period of a driving unit, applying for a plurality of physically continuous data buffer areas, and descriptor structural bodies and write-back result structural bodies with the same quantity; the driving unit constructs a circular linked list containing buffer area information of the direct memory access unit and a write-back address; the driving unit maps a buffer area of the direct memory access unit of the ultrasonic data to a virtual address, and the virtual address is fed back to the upper computer through the driving unit; the field programmable gate array reads ultrasonic data collected by an ultrasonic equipment probe, obtains a buffer area address according to a descriptor of the ultrasonic data, writes the ultrasonic data, and the direct memory access unit updates the completed memory access times of the direct ...

Facial expression recognition method based on improved residual neural network

The invention belongs to the technical field of image recognition, and discloses a facial expression recognition method based on an improved residual neural network, and the method comprises the following steps: 1, carrying out the data preprocessing; 2, constructing a facial expression recognition model based on the improved residual neural network; 3, performing iterative training on the face recognition model; and step 4, obtaining a facial expression recognition result based on the trained facial expression recognition model. Two residual modules are designed based on the residual idea, and the problem of network degradation is prevented. According to the method, the Inception module is introduced, and the problem that feature extraction is not rich enough is solved. According to the method, a new Mish activation function is used for replacing a common ReLu activation function, the robustness of the model is further improved, and the precision of facial expression recognition is improved ...

BIM-based road alignment design scheme comprehensive evaluation and optimization method

The invention discloses a BIM-based road alignment design scheme comprehensive evaluation and optimization method. The method comprises the steps of S1, constructing a BIM-based road alignment design scheme parameterized model; s2, establishing a data interaction interface between the BIM-based road information model and the vehicle driving simulation module; s3, vehicle kinetic parameter analysis based on a vehicle driving simulation module; s4, vehicle dynamics parameter acquisition based on the vehicle simulation module and data integration with the road BIM model; s5, analyzing and evaluating the safety and comfort of the road alignment design scheme based on the BIM; s6, performing economic analysis on the road alignment design scheme based on the BIM; and S7, adjusting and optimizing the BIM-based road alignment design scheme. According to the method for rapidly designing and evaluating the road alignment design scheme in the BIM model, the optimal road alignment design scheme can ...

Drilling structure for amphibious exploration equipment

The invention relates to the field of exploration and drilling, in particular to a drilling structure for amphibious exploration equipment, which comprises a lifting mechanism, a drill rod and a drill bit, the drill bit comprises a first shell, a first servo motor, a first lead screw, a telescopic mechanism and a drilling component. The first servo motor is fixedly connected into the first shell, the first lead screw is fixedly connected with the first servo motor, and the bottom of the first lead screw is rotationally connected with the first shell. The telescopic mechanism comprises a telescopic block and a telescopic rod, the telescopic block is a prism which is rotationally matched with the first lead screw and extends in the vertical direction, the telescopic rod passes through the passing groove, and the two ends of the telescopic rod are rotationally connected with the telescopic block and the drilling component correspondingly; the drilling component is a fan-shaped cylinder extending ...

Motor structure and plastic particle bridge breaking stirring device

The invention provides a motor structure, which comprises a shell, an annular inner cavity is formed in the shell, a sliding groove with an opening towards the center is formed in the inner cavity, and an air inlet is formed in the shell; the stator is fixedly installed on the inner cavity, an annular stator iron core and a winding are arranged on the stator, and the winding is arranged around the stator iron core; the annular rotor is arranged in the center of the stator, the annular rotor is provided with a sliding ring extending towards the sliding groove, and the annular rotor rotates in the circumferential direction; a first air cavity is formed above the stator, a second air cavity is formed below the stator, the first air cavity is communicated with the second air cavity, an air inlet is communicated with one or two of the first air cavity and the second air cavity, and the annular rotor is installed on the inner cavity to form a first air outlet end and a second air outlet end; ...

Novel mining stock tray

... 本实用新型公开了一种新型矿用锚杆托盘，包括托盘焊合件、垫片、螺母和锚杆；所述托盘焊合件包括托盘和加强筋，且加强筋设置在托盘内表面；所述托盘设置在岩壁下端，且锚杆依次穿过托盘和岩壁；所述锚杆上开设有与螺母相匹配的螺纹，且螺母螺纹连接在锚杆上；所述托盘通过螺母与岩壁固定连接，且托盘与螺母之间设置有垫片；所述垫片的内轮廓与托盘的外轮廓结构一致；该新型矿用锚杆托盘，它采用将锚杆与托盘端面的夹角范围设计为30°～90°，通过在托盘上开设键槽，解决了对于30°左右倾角煤层支护效果不佳的问题，同时，提高巷道支护效果，巷道支护安全有了保证，实用性强，易于推广使用。 ...

Cast hole flash cleaning tool

The invention relates to the technical field of casting, and discloses a cast hole flash cleaning tool which comprises a cleaning assembly and a positioning assembly used for positioning a workpiece. The cleaning assembly comprises a fixing plate, a supporting plate, firing pins and an ejector rod, the fixing plate and the supporting plate are arranged in parallel, the firing pins are fixed to the fixing plate, the bottom ends of the firing pins slidably penetrate through the supporting plate, a hammering rod is fixed to the middle of the fixing plate, the bottom of the hammering rod slidably sleeves the ejector rod, and the other end of the ejector rod penetrates through the supporting plate. A reset spring is installed on the outer side of the ejector rod located between the supporting plate and the fixing plate. The positioning assembly is used for being connected with the supporting plate and located below the supporting plate. The device is easy to operate and efficient in cleaning ...

Rubber powder asphalt pavement performance early warning method based on rubber powder swelling-dissolving state

The invention discloses a rubber powder asphalt pavement performance early warning method based on a rubber powder swelling-dissolving state, which comprises the following steps of: preparing rubber powder modified asphalt, acquiring attribute parameters of an asphalt mortar material, acquiring rubber powder asphalt performance indexes and rubber powder particle swelling-dissolving state change parameters based on a macro-micro test, and carrying out numerical processing on the acquired parameters to obtain a rubber powder asphalt pavement performance early warning result. The method comprises the following steps: quantitatively characterizing the swelling-dissolving state of rubber powder particles, constructing a prediction model of rubber powder modified asphalt performance and the swelling-dissolving state by using a neural network algorithm, carrying out heterogeneous rubber powder modified asphalt mortar modeling and mesoscopic parameter assignment in discrete element software, and ...

Method for improving surface quality of cast-rolled plate

The invention discloses a method for improving the surface quality of a cast-rolled plate. The method comprises the following steps that S1, the distance between a spray gun and a cast-rolled roller is adjusted; s2, a spray gun is opened, the flow of combustion gas is adjusted through a flow meter arranged on a combustion gas pipeline, and the flame size is controlled; s3, a walking mechanism is started, the walking mechanism drives a spray gun to reciprocate in the length direction of the casting roller, and surface flame spraying is conducted on the surface of the casting roller; and the spray gun stays at the edge of the cast-rolled plate for 2-3 seconds. By the adoption of the method for improving the surface quality of the cast-rolled plate, the problems that an existing flame spraying carbon layer is not uniform, and roller sticking cannot be effectively solved can be solved.

Layered underwater thick plate cutting process

The invention discloses a layered underwater thick plate cutting process which comprises the following steps: firstly, using a special tubular welding rod which is made of a seamless steel tube with the diameter of 6-8 mm or 8-10 mm, and introducing 0.15-0.35 MPa of oxygen into the tube by using an electrode clamp of a cutting torch; when the electric arc heats the metal, oxygen oxidizes the metal, high temperature generated by the underwater electric arc and chemical reaction heat generated by the oxygen and cut metal elements can be used for cutting by utilizing small cutting current, and meanwhile, oxygen with certain pressure and flow is continuously supplied in the cutting process. And molten metal and slag in the kerfs are continuously blown away, so that the kerfs are formed. According to the layered underwater thick plate cutting process, the required cutting length and depth are obtained along with continuous back-and-forth movement of underwater electric arcs and continuous supply ...