SU1539402A1 - Control system - Google Patents

Abstract

The invention relates to mechanical engineering and can be used in hydraulic control systems of differential cylinders. The purpose of the invention is to increase the efficiency of the hydraulic system. The hydraulic control system consists of a distributor 6, a spool valve 7 controlling the hydraulic cylinder 1. The spool valve 7 includes a spring-loaded two-stage spool 8 and a movable pusher 16. Control chamber 17 is made between the pusher 16 and the end of the spool 8, connected by an axial channel 18 to another control cavity 19. The annular grooves 22 and 23 through the annular groove 10, made on the spool, connect the rod 4 and piston 5 cavity of the hydraulic cylinder 1. The use of the invention allows to provide a differential connection of the hydraulic cylinder while reducing the load on the output link and thus increasing the efficiency of the hydraulic system. 1 il.

Description

The invention relates to mechanical engineering and can be used in hydraulic control systems of differential cylinders.

The purpose of the invention is to increase the efficiency of the hydraulic system.

The drawing shows a diagram of the device.

The hydraulic control system contains a differential cylinder 1, a piston 2 with a rod 3, mounted in cylinder 1 to form rod 4 and piston 5 cavities, valve 6, a two-stage spool valve 7,

Spool valve 7 is equipped with a spring-loaded spool 8, on the cylindrical surface of which there are two grooves 9 and 10. Through

1, the cylindrical groove 10 is connected to the rod cavity 4. The end cavities 12 and 13 are connected to the distributor 6 and the piston cavity 5 through the control channels 14 and 15. A movable pusher 16 is installed in the spool valve 7 to form a pusher and the control valve 17 between the end face, through the axial channel 18 is connected to another control cavity 19 formed by the valve body at the end of a smaller spool stage. The control cavity 19 by the channel 20 is connected to the annular groove 21 and further to the distributor 6.

In addition, the housing is made of channels 22 and 23, offset one from another along the axis of the housing, kosp

oh

WITH ъ

GO

The piston 5 and the rod 4 cavities are connected to the distributor 6 through a cylindrical groove O and a spring 24 is installed in the end cavity 13.

The hydraulic control system operates as follows.

When the working fluid is injected into the rod cavity 4 of hydraulic cylinder 1, the fluid from the distributor b is through an annular groove 21, channel 20, control chamber 19, axial channel 18 is brought into the control cavity 17. Under the action of pressure in the cavity 17, the valve 8 moves to the right and in its movement separates the rod 4 and piston 5 cavities which are interconnected through the annular groove 10 of the valve 8 and the annular grooves 22 and 23.

Upon further movement of the spool 8, the working fluid opens from the annular groove 21 through the annular groove 9, channel 11 into the rod cavity 4. The working fluid from the piston cavity 5 is freely drained into the distributor 6.

When the working fluid is injected into the porsy cavity 5 of the rod cavity 4, through the annular groove 22, the annular groove 9, the annular duct 21 and the distributor 6 is connected to the drain. The pressure in the control cavity 17 through the axial channel 18, the control cavity and channel 20 is set equal to the pressure of the drain. The spool 8 returns to the leftmost position and is held there by the force of a pre-compressed spring 24. At the same time, the working fluid from the rod end 4 enters the piston cavity 5 through annular grooves 22 and 23 and the annular groove 10 of the spool 8. Working fluid through channels 14 and 15 enters the end cavities 12 and 13 of the valve control.

With increasing external load applied to the rod 3, the pressure of the working fluid increases, which leads to

- an increase in pressure and in the end cavities 12 and 13. The spool 8, overcoming the force of the spring 24, moves to the right, separates the annular races

five

0

five

0

five

0

five

0

points 23 and 22 and upon further movement connects through the annular groove 9 an annular groove 21 with an annular groove 22 and with the rod cavity 4. Pressure is released from the rod cavity, the cylinder switches to another mode of operation — movement with lower speed and greater traction .

As the external load decreases, the pressure in the cavities 12 and 13 also decreases, the spool 8 by the spring 24 moves to the left, the flow of working fluid from the rod cavity 4 to the piston 5 resumes and the speed of movement of the rod 3 increases.

Claims (1)

Invention Formula A hydraulic control system comprising a differential cylinder, a piston with a rod mounted in the cylinder to form a rod and piston cavities, a valve, a slide valve connected to the valve, the spring-loaded valve of which is made with two annular grooves, one of which is connected to the rod cavity of the cylinder via channels, The control channels are connected to the end cavities of the spool valve, one of which is connected to the distributor and the piston cavity, which, in order to efficiency of the hydraulic system, it is equipped with a movable pusher installed in the axial bore of the spool, which is two-stage, with a control cavity formed between the end of the pusher and the spool, which is connected to another control cavity formed by the valve body and the end of the lower stage through an axial channel the spool connected by channels to the annular groove and the distributor, and in the valve body there are channels that are displaced relative to each other along the axis of the housing, and The device of the second annular groove of the spool communicates with the distributor piston and rod cavity. s 21 15 3 13 8 V K 1 /./