SU789284A1 - Hydraulic press control system - Google Patents

Description

(54) SYSTEM / VIA CONTROLS HYDRAULIC.

Press release

one

The invention relates to the field of metal forming and can be used in vulcanization presses.

A hydraulic press control system is known that contains a drive for program carriers in the form of a cylinder with a piston and a rod connected to a rack, interacting with a gear wheel mounted on a camshaft connected through distributors to executive cylinders, as well as a compensator 1-J.

The disadvantage of such a system is that when the duration of a technological operation (e.g., vulcanization) changes, it is necessary to replace the gear associated with gear cutting of the program carrier, since the camshaft must rotate at the same angle each time (usually 360 ° ). In this connection, press maintenance is considerably complicated. Designing a control system with a piston stroke of a program carrier larger than that required to rotate the camshaft through 360 °, significantly increases the size of the system.

The purpose of the invention is to simplify the maintenance of the press.

This goal is achieved by the fact that in a control system of a hydraulic press containing a program carrier drive, made in the form of a cylinder with a piston and a rod connected with gear cutting interacting with a gear wheel mounted on a camshaft connected through distributors to executive cylinders, also a hydraulic compressor, the drive piston of the program carriers is equipped with a control rod connected with a plunger of one of the distributors by means of a bracket, and its rod is equipped with a spring with ovine nut; (A gear rack is installed in a groove made in the rod, while the rod and the piston are separate and installed relative to each other with a gap.

FIG. 1 shows a control system diagram; in fig. 2 - section AA

2Q in FIG. one.

Claims (1)

The control system includes a pump 1, valves 2-5 with plungers, a hydraulic compensator 6, executive cylinders 7 and 8, a drive for program carriers 9, a camshaft 10 with cams 11-13, safety (14) and check (15) valves. The compensator 6 is designed to ensure the continuity of the fluid flow in the system and has a spring-loaded piston 16. The drive of the program carriers 9 has a piston 17, which is separated from the rod 18 and does not have a rigid connection with it. The rod 18 is constantly pressed into the drive of the program carriers 9 by the spring 19. The adjusting nut 20 restricts the stroke of the rod 18 to the inside of the drive of the program carriers 9. At the end of the rod 18, the rack rail 21 is fixed. The studs 22 allow fast mixing, toothed rack, while adjusting the duration of the process time. A toothed rack 21 is engaged with a gear wheel 25, which is freely seated on the camshaft 10. At the end of the gear wheel 25, there are teeth that engage with the teeth of the coupling half 26 mounted on the key and pressed by the spring 27 to the gear 25. The bevels of the coupling half 26 and the gears 25 slip against each other. The piston 17 is rigidly connected to the rod 28, on which the bracket 29 is fixed. The plunger 2 of the distributor is rigidly connected to the rod 30, on which there are stops 31 and 32 with springs 33 and 34. The bracket 29 can interact with the distributor 2 through the stops 31 and 32, springs 33 and 34 and the rod 30. The check valve 15 is designed to maintain a predetermined pressure in the hydrolines when, for example, due to leaks, the piston of the program carrier actuator has not moved to the predetermined position. In this case, part of the liquid from the pump 1 enters the drive of the program carriers, and the camshaft 10 will switch the corresponding distributor with its cam. The safety valve 14 limits the increase in pressure in the system beyond that specified. The operation of the control system is as follows. When the pump 1 is turned on, the fluid through the distributor 5 enters the sub-piston cavity of the actuating hydraulic cylinder 8. From the sub-piston cavity of the hydraulic cylinder 8, the liquid is displaced through the distributors 5 and 2 into the sub piston cavity of the program carrier drive. When this piston 17 acts on the rod 18 and moves it up. The gear wheel 25 with the camshaft 10 rotates. After the actuating hydraulic cylinder 8 completes the working (idle) stroke, the camshaft 10 rotates at a predetermined angle and switches the distributor 4 with the cam 12. hydraulic cylinders 7 and 8 do not work, included cam 11 and valve 3, and fluid from pump 1 flows through valves 3 and 2 into the program carrier drive. Program carriers at this time do not interact with distributors. The distributor 2 is switched by the bracket 29 through the springs 34 and 33, the stops 31 and 3Z and the rod 30 in the extreme upper and lower positions of the piston 17. To change the dwell time, use the adjusting nut 20 to set the rod and the toothed rack 21 to the set positions. With an increase in the time delay, the rod 18 extends from the drive 9 of program carriers, while decreasing it moves inward. The module and the number of teeth of the gear wheel 25 are chosen such that they can provide a compact design of the control system and a fairly wide range of variation of the time delay. This becomes possible due to the fact that the rod 18 is not connected to the piston 17. If the piston of the program carrier drive has not moved to a predetermined position due to leaks, in this case, the fluid from pump 1 begins to flow through safety valves (14) and check valves (15) to the hydraulic compensator 6. The spring of the check valve 15 is set up so that a part of the liquid entering through the safety valve 14 also gets into the drive of the program carriers 9. At the same time, the piston 17 will move upwards and turn the camshaft 10 d About the position in which his cam switches the corresponding valve. The invention of the hydraulic press control system, mainly for vulcanization, contains a drive of program carriers made in the form of a cylinder with a piston and a rod connected to a rack interacting with a gear wheel mounted on a camshaft connected through distributors to executive cylinders, as well as a hydraulic compensator, characterized in that, in order to simplify the maintenance of the press, the drive cylinder of the program carriers is provided with a control rod rigidly connected to the piston, in one of the valves with a plunger bracket and a spring with an adjusting nut located on its rod; the rod and the piston are mounted relative to each other with a gap, and a groove is made in the rod for moving the toothed rack. Sources of information taken into account in the examination 1. USSR author's certificate on Application No. 2727914 / 25-27, cl. B 30 V 15/20, 1978