SU418351A1 - HYDRAULIC KOMPRESS CONTROL SYSTEM - Google Patents

Description

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This invention relates to control systems for hydraulic presses.

A hydraulic press control system is known, comprising a master working cylinder connected to a slider, the piston and rod cavities of which are connected by pipelines through a distributor to a pump discharge line integrated into the pipeline connecting the distributor to the rod end of the cylinder, the locking-throttling device, and the filler installed in the pipeline connecting the distributor to the piston cavity of the cylinder and connected through the filling-drain valve to the latter, two-position spool and spool with electromagnetic control.

The disadvantages of the known system are low productivity and reliability of work.

In the proposed hydraulic press control system, these disadvantages are eliminated due to the fact that the two-position valve is connected by pipelines to the pump discharge line, to one of the end cavities of the distributor, with a filling-drain valve and two electromagnetic-controlled two-slide spools that are hydraulically connected to the pump pressure line and with the end cavities of the distributor, as well as with one of the elements of the locking and choking device.

The control system of the hydraulic press is shown in the drawing. The described control system contains it: pump 1 of the main drive (for pressure 200-320 kgf / cm) with safety valve 2 on the pressure line; main distributor 3 connected by pipelines to the nano main line of the main drive pump, drain line (it is also the main pump suction main line), piston and rod cavities of the working cylinder 4; a shut-off throttling device mounted on the rod end of the working cylinder and consisting of a check valve 5 and a two-position throttle element 6; the filler 7 connected by pipelines with the suction main of the main drive pump and through the open-drain valve 8 to the piston cavity of the working cylinder; two-way slide valve 9, connected by pipelines with a pressure line 10

pump control (not shown), with a cylinder of a drive of a filling-drain valve 8 and with a drain through an on-off valve 11 with control from an electromagnet E1, which in turn is connected by pipelines with

end cavities of the main distributor 3 and the pressure line 10 of the control pump; an on-off spool 12 with electromagnet control E2, connected by pipelines to the pressure line 10 of the control pump, the right end cavities of the two-position spool 9 and the double-throttling element 6, as well as to the drain.

The control system provides press operation in the modes of automatic reciprocating movement of the press ram and single strokes with manual control.

In both modes, the distribution of fluid into the plenum and chute cavities of the working cylinder 4 is carried out by means of the main two-distributor distributor 3, which is switched from one position to another B to the reverse of the sliding head by supplying the liquid under pressure from the end-section pump through the two-position valve 11 with electromagnet control E1.

The signal for switching on and off the electromagnet E1 at the moments of reversal with manual control can be supplied, for example, from an electric toggle switch located on the console, with automatic reciprocating transfer of the press slide - from electrical proximity sensors (BVK), or (in the case of program control) from a digital sensor associated with a press slide (BVK and position sensor are not shown in the drawing). When the electromagnet E1 is turned on, the spool 11, overcoming the spring force, occupies the lowest position, when the electromagnet is turned off, the goldfish switch by the force of the spring and occupy the extreme upper position. The switching of the spool 12 is similar.

During the movement of the press slide, the on-off spool 12 is permanently in its lowest position (electromagnet E2 is on). In this case, the pressure line 10 of the control pump communicates with the right end cavities of the spool 9 and the throttling element 6, which, under the action of fluid pressure, overcoming the force of the springs, switch and take the left extreme position (opposite to that shown in the drawing). In this case, if the two-position spool AND is in the extreme upper position (electromagnet E1 is disconnected), the main valve 3 under the action of the pressure of the fluid flowing under its left end from the pressure line 10 of the equalization pump switches to the extreme right position (opposite the end cavity of the main valve 3 communicated through the spool 11 with a drain). When the main drive pump is turned on, the press slider will move down (accelerated idling) by the pressure of the fluid entering the piston cavity of the working cylinder 4 from the main drive pump and filler 7 through the open filling drain clan 8. At this moment, the liquid through the throttling element 6 and the main distributor 3 will be discharged into the filler 7. When the pressure in the piston cavity of the working cylinder is increased within 5-6 kgf / cm (for example, at the moment of contact forging a pin) fill-drain valve 8 zakroets and cut off from fluid viewable.END_BOLD filler 7 in the piston chamber of the working cylinder. From this moment on, a working stroke will be made with the supply of fluid into the crush-cavity of the working cylinder only from the main drive pump.

If the on-off slide valve 11 is in the lowest position (electromagnet E1 is on), then the pressure of the fluid from the pressure line 10 of the pump

the control will flow into the right end face of the main distributor 3, and the opposite end of the main distributor 3 communicates with the drain; The main distributor shifts to the extreme left position, corresponding to the upward movement of the press ram. At the same time, the liquid from the main drive pump through the main distributor 3, the check valve 5 and the throttling element 6 will flow into the hydraulic rod of the working cylinder, and from the piston cavity the liquid will be drained into the filler 7 through the filling-drain valve 8, which at this moment will be open due to the pressure of the fluid entering the cylinder, the servo tube from the pressure line 10 of the control pump through the two-position valve 11.

The press slide is stopped by turning off both electromagnets E1 and E2, with all the elements of the control system

will occupy a position corresponding to their location in the drawing; the main drive pump will be discharged into the filler 7 via the main distributor 3 and the open pulling-drain valve 8, shtokov

the cavity will be closed by a check valve 5 and a throttling element 6.

Subject invention

A hydraulic press control system comprising a master working cylinder connected to a slider, the piston and rod cavities of which are connected by pipelines through a distributor to a pump discharge line integrated into the pipeline,

a connecting valve with a cylinder bore cavity, a shut-off throttling device, as well as a filler installed in the pipeline connecting the valve with the norshne cylinder cavity, and

Associated through a positively-drain clan with the latter, a two-position valve and an electromagnetic-controlled spool, characterized in that, in order to increase productivity, the two-position

the spool is connected by pipelines to the nano. highway of the pump, to one of the end cavities of the distributor, to an additional valve and to two two-way spools with electromagnetic control, hydraulically connected to the discharge line of the pump and to the end cavities of the distributor, as well as to one of the elements of the stop valve. devices.

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