RU1807248C - Pneumohydraulic transducer control system - Google Patents

Abstract

Usage: in clamping devices. SUMMARY OF THE INVENTION: Ensuring the efficient operation of the press hydraulic actuator by automatically turning on the high pressure stage of the pneumohydraulic converter. 1 ill.

Description

The invention relates to a hydraulic engineering drive, in particular to press drives, and can be used in clamping devices.

The purpose of the invention is to increase the efficiency of the pneumatic-hydraulic converter by automating its high-pressure stage.

The drawing shows a diagram of the proposed system.

Pneumohydro control system. of the educator comprises an actuating cylinder 1 connected to a high-pressure cavity 2 of a two-stage pneumatic-hydraulic converter 3 having a backpressure cavity 4 and a working cavity 5, which is connected to a working fluid source 6 having an air cavity 7 through a switching device connected to the source 8 compressed air and atmosphere 9.

The switching device is equipped with a spool valve 1.0 of a differential type with a stepped cylindrical spool 1.1, in which the cavity 12 formed by the end surface of the spool 11 having a larger diameter is connected by a pipeline to the air cavity 7 of the source 6 of the working fluid, and the cavity 13 formed by the end face of the spool of a smaller diameter, connected by a pipeline with a cavity 4 back pressure pneumatic-hydraulic Converter 3 through a radial hole 14 and with a source of compressed air 8 through an axial the bore, and the inter-face cavity 15 of the spool 11 is associated with the atmosphere 9.

The hydropneumatic converter also includes a piston 16 and a check valve 17 installed in the piston 17 and opened by the stop 18. And the system includes a pneumatic valve 19.

The pneumatic-hydraulic converter control system operates as follows.

When air is supplied from the source, it enters the receiver of the system and into the cavity 13 of the distributor 10, displacing the spool 11 upwards (according to the drawing) and through the hole 14 into the cavity 4 of the pneumatic transducer. The pneumatic transducer piston 16 moves all the way up. The pressure stop 18 forcibly opens the check valve 17. After the distributor 19 is turned on, compressed air enters the supply tank 6 with the working fluid, forcing it into the cavity 5, the pneumatic transducer,. where, through the check valve 17, the working fluid enters the cavity 2 and then to the Executive hydraulic cylinder 1,

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shcha rod of a hydraulic cylinder. An increase in the load on the rod of the hydraulic cylinder 1 causes an increase in the pressure of the working fluid in the cavities 2 and 5. A further increase in the load causes an increase in the pressure in the flow tank beating the cavity 5 to the switching pressure. When the switching pressure is reached in the above cavities and in the cavity 12, the spool 11 of the distributor 10, displaced, communicates the cavity A of the pneumatic-hydraulic converter 3 with the atmosphere, while the air supply from the source entering the cavity 13 is stopped. The spool 11 is held in this position at a pressure in the cavity 12 greater than the switching pressure. After the air pressure in the cavity 4 drops below the pressure in the cavity 5, the piston 16 of the pneumatic-hydraulic converter starts to move, the check valve 17 closes and the pressure in the cavity 2 increases to the maximum. The pressure drop in the cavity 5 is lower than the switching pressure, caused by a decrease in the load on the actuating hydraulic cylinder 1 or by switching the distributor 19 to its initial position, at which the air cavity of the supply tank b comes with the atmosphere, causes the spool 1.1 in the distributor 10 to return to its original position (up according to the drawing). In this case, the cavity 4 communicates with the air source. The pressure of the air source moves the piston 16 of the pneumohydroprocessing unit 3 to its original position (up to the stop according to the drawing), while the check valve 17 is opened by the pressure stop 18 in the housing cover, the working fluid from the cylinder 1 is returned to the supply tank b if the distributor 19 is switched , or continues to come from the supply tank 6 into the actuating hydraulic cylinder 1.

Thus, the proposed hydraulic engineering control system ensures the efficient operation of the press hydraulic actuator or clamping device by automatically switching on the high-pressure stage of the pneumatic-hydraulic converter. The design of the control device, made in the form of a spool valve of a differential type, included in the control circuit of the proposed method, improves the reliability of the control system.

Claims (1)

SUMMARY OF THE INVENTION A pneumatic hydraulic converter control system comprising an actuating cylinder connected to a high pressure cavity of a two-stage pneumohydraulic converter having a back pressure cavity and a working cavity that is connected to a working fluid source having an air cavity through a switching device connected to a source of compressed air and atmosphere characterized in that, in order to increase work efficiency by automating the inclusion of a high of the pressure of the pneumatic-hydraulic converter, the switching device is equipped with a differential-type spool valve with a stepped cylindrical spool, in which the cavity formed by the end surface of the spool having a larger diameter is connected by a pipeline to the air cavity of the source of the working fluid, and the cavity formed by the end of the valve of a smaller diameter is connected by a pipeline with a counter-pressure cavity of the pneumatic-hydraulic converter through a radial hole and with sources lump of compressed air through the axial hole, and the inter-end cavity of the spool is associated with the atmosphere. To Lothredy / Lell