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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ

Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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Применить Всего найдено 5. Отображено 5.
23-11-2011 дата публикации

Voltage acceleration inverse time-delay over-current protection method used for micro power grid

Номер: CN0102255294A
Автор: YONGLI LI, QIANG JIN, BOTONG LI, ZHONGZHOU LI, LI YONGLI, JIN QIANG, LI BOTONG, LI ZHONGZHOU
Принадлежит:

The invention relates to the field of distribution network relay protection of an electric power system and relates to a voltage acceleration inverse time-delay over-current protection method used for a micro power grid. According to voltage and current information acquired by a protection mounting point, after a short circuit fault occurs and is judged to be a positive directional fault, a method for calculating protection time-delay operation time comprises the step of multiplying an existing inverse time-delay over-current protection setting formula by a voltage accelerated factor to obtain an accelerated operation time, wherein the minimum value of per-unit values of three phase voltages and three line voltages at the protection mounting point is taken as the voltage accelerated factor. The voltage acceleration inverse time-delay over-current protection method used for the micro power grid has the advantages that the time for eliminating the short circuit fault at line exit is very ...

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Номер записи: 1
02-12-1998 дата публикации

Axial mold closing rolling mill

Номер: CN0002298885Y
Автор: LI ZHONGZHOU, QUAN XIAOHUI, CHENG ANPING, ZHONGZHOU LI, XIAOHUI QUAN, ANPING CHENG
Принадлежит: XI AN INST OF HEAVY MACHINERY, XI'AN INST. OF HEAVY MACHINERY, MINISTRY OF MACHINE-BUILDING INDUSTRY

The utility model relates to an axial mold closing rolling mill mainly used for producing axisymmetric forgings. The utility model comprises an upper mold and a lower mold which can rotate winding a dead axle, and a driving device which can drive the upper mold and the lower mold to rotate, wherein, the rotation axis of the upper mold is slantingly crossed with the rotation axis of the lower mold oppositely, and the upper mold is arranged on the movable cross beam of a machine frame which is provided with a pressing down mechanism used for driving the movable cross beam. Because the upper mold is rotated winding the dead axle, namely, the direction of the acting force of the upper mold to forging stocks is not changed in the whole process of the production, in the process of operation, the sloshing of the machine can not caused, and the forming force is much smaller than the conventional mold forgings.

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Номер записи: 2
31-12-2008 дата публикации

Core roller quick replacement device

Номер: CN0101332468A
Автор: SHULIAN ZHANG, ZHONGZHOU LI, DAXIANG YANG, XUEBIN DU, SHAOFAN ZHOU, ZHANG SHULIAN, LI ZHONGZHOU, YANG DAXIANG, DU XUEBIN, ZHOU SHAOFAN
Принадлежит:

The invention belongs to a core roller fast exchange device for a ring rolling mill, which particularly relates to a core roller fast exchange device which drives a double-piston rotary cylinder, a clamping head and a clamping claw to rapidly clamp and loosen the core roller of the ring rolling mill. The core roller fast exchange device is characterized in that: a rotary joint (9) is fixed at thelower end of the double-piston rotary cylinder (8), a piston rod arranged over the double-piston rotary cylinder (8) is connected with the clamping head (5), a connecting bracket (7) is fixedly connected at the upper external edge of the double-piston rotary cylinder (8), a support boss (2) and the double-piston rotary cylinder (8) are connected together; a multi-paw clamping claw (1) is connected inside the support boss, the lower end of the multi-paw clamping claw (1) is movably connected with the clamping head. The core roller fast exchange device for the ring rolling mill has simple and compact ...

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Номер записи: 3
17-11-2010 дата публикации

Aluminum alloy ring piece rolling technique and device

Номер: CN0101337256B
Автор: YANG DAXIANG, ZHANG SHULIAN, LI ZHONGZHOU, DU XUEBIN, DAXIANG YANG, SHULIAN ZHANG, ZHONGZHOU LI, XUEBIN DU
Принадлежит:

The invention relates to a method and equipment for processing metal material, particularly to a technology and equipment for rolling superlarge-diameter aluminium alloy ring pieces. The method and the equipment are characterized in that the rolling technology comprises the following steps: A. calculating parameters: calculating technical control parameters including the dimensions of a roughcast, the rolling linear speed, the radial-axial rolling force during various stages, the enlargement rate of the ring pieces, the radial-axial feed speed, the external diameter of the ring pieces, the height of the ring pieces and the wall thickness of the ring pieces according to the dimensions of a product ring; B. inputting parameters: inputting the various technical control parameters into a numerical control ring rolling mill computer according to the calculation results; C. numerically controlled rolling: fully automatic control is adopted during the rolling process. A radial rolling mechanism ...

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Номер записи: 4
07-01-2009 дата публикации

Aluminum alloy ring piece rolling technique and device

Номер: CN0101337256A
Автор: ZHANG SHULIAN, LI ZHONGZHOU, YANG DAXIANG, DU XUEBIN, SHULIAN ZHANG, ZHONGZHOU LI, DAXIANG YANG, XUEBIN DU
Принадлежит:

The invention relates to a method and equipment for processing metal material, particularly to a technology and equipment for rolling superlarge-diameter aluminium alloy ring pieces. The method and the equipment are characterized in that the rolling technology comprises the following steps: A. calculating parameters: calculating technical control parameters including the dimensions of a roughcast, the rolling linear speed, the radial-axial rolling force during various stages, the enlargement rate of the ring pieces, the radial-axial feed speed, the external diameter of the ring pieces, the height of the ring pieces and the wall thickness of the ring pieces according to the dimensions of a product ring; B. inputting parameters: inputting the various technical control parameters into a numerical control ring rolling mill computer according to the calculation results; C. numerically controlled rolling: fully automatic control is adopted during the rolling process. A radial rolling mechanism ...

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Номер записи: 5