SU1516631A1 - Hydraulic drive - Google Patents

Abstract

The invention allows to increase the reliability of the hydraulic drive. Each cavity 8, 9, 10, 11 of the four-way reversing distributor 4 is connected to the pressure source 3 via an appropriate control valve 16, 17. The control bodies 18,19 are installed with the possibility of interaction with the piston 2 in one of its extreme positions and with the drain 20 through the throttles 12, 13. In the distributor 4 housing there is a spool 5, control pistons 6.7 with main and additional cavities 8, 9,10,11. The spool 5 is installed with the ability to interact with the corresponding pistons 6, 7. The main cavities 8.9 are directly connected to the control valve 16, 17 and to the drain 20 through throttles 12.13, which are made at the ends of the pistons 8.9. The cavity 10 is connected to the cavity of the hydraulic cylinder 1, the cavity 11 to the source. The area of the cavity is 8.9 larger than the area of the cavity 10, 11. 1 Il.

Description

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This invention relates to general engineering.

The purpose of the invention is to increase reliability.

The drawing shows a diagram of the hydraulic drive.

The hydraulic actuator contains a hydraulic cylinder 1 with a piston 2, a power source 3, a reversible controlled distributor k with a spool 5 and control pistons 6 and 7 with cavities main 8 and 9 and additional 10 and 11, throttles 12 and 13, hydraulic lines I and 15, valves 1b and 17c with control bodies 18 and 19, drain 20.

The hydraulic actuator works as follows.

The hydraulic actuator is depicted in the worst combination of the positions of spool 5, valve 4 and piston 2 of hydraulic cylinder 1, i.e. when the spool 5 is in the middle (according to the drawing) position, and the piston 2 is in any intermediate position, when the power supply 3 is turned on, the reversing distributor will take the rightmost (according to the drawing) position, and the corresponding cavities of the hydraulic cylinder 1 are connected respectively to the power supply 3 and BOM 20, When the piston 2 of the hydraulic cylinders 1 has reached the extreme right (according to the drawing), valve 1b will operate, connecting cavity 9 with the pressure source 3. Due to the fact that the working area of cavity 9 is larger than that of cavity 10, under the effect of the resultant force from the working fluid pressure on the control pistons 6 and 7 applied to the spool 5, the latter will move to the left (according to the drawing) and connect the corresponding cavities of the hydraulic cylinder 1 with the drain and with the pressure source 3, as a result of which the piston 2 of the hydraulic cylinder 1 will reverse. The withdrawal of the piston 2 of the hydraulic cylinder 1 from the right extreme position (according to the drawing) will cause isolation by valve 1b of cavity 9 from the discharge line and a drop in the pressure of the working fluid in cavity 9 to the pressure of the fluid. The spool 5 is held in the leftmost position (according to the drawing) due to the fact that the working area of cavity 11 is larger than that of cavity 10. When the piston of the hydraulic cylinder 1 reaches the leftmost position (according to the drawing), the valve 17 will work and the cavity 8 of the distributor 4 will connect to 3 pressure source. Due to the fact that the sum

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the dimensional working area of the cavities 8 i and 10 is larger than that of the cavity 11, under the action of the resultant force from the pressure of the working fluid on the control pistons 6 and 7 applied to the spool 5, the latter moves to the right (according to the drawing) and connects the cylinder cavity and the cavity 11 with the drain line and the corresponding cavities of the hydraulic cylinder 1 with the pressure source 3, as a result of which the hydraulic cylinder will perform a reversing stroke, which will lead to the movement of the hydraulic cylinder piston to the right. The withdrawal of the piston 2 of the hydraulic cylinder 1 from the leftmost (according to the drawing) position will cause the valve 17 of the cavity 8 to isolate from the pressure source and the pressure of the working fluid in the cavity 8 to drop to the pressure of the drain.

Further movement of the spool 5 to the right extreme (according to the drawing) position and holding in it is carried out due to the effect of the source 3 of pressure in the cavity 10 on the control piston 6, after which the reverse process is repeated.

The operation of the hydraulic actuator at other combinations of the positions of the spool, the distributor and the piston of the power cylinder by the moment of power supply to the distributor occurs in a similar way, i.e. the spool is held in the extreme positions as a result of the pressure of the working fluid in the additional cavities on the control pistons and switches when the piston reaches the power cylinder of the extreme positions.

Claims (1)

Invention Formula A hydraulic actuator containing a hydraulic cylinder with a piston, two controllable valves, a reversible four-way valve with control cavities and a housing, a pressure source, a drain and a throttle, while each control cavity of the reversing distributor is connected to a pressure source through an appropriate control valve whose control element is installed with the ability to interact with the piston in one of its extreme positions and with the drain through the throttle, characterized in that, in order to increase reliability in operation, in the package Aulus emogo reversibly mounted distributor slide valve with control pistons and main do51516631 polishing cavities, with the o-ends of the pistons, one of the additional collectors installed with the possibility of reciprocal cavities of the control pistons of the sub-action with the corresponding controls to the corresponding cavity main pistons, and the main cavities of the hydraulic cylinder, and the other, directly connected to the pressure source, while To the controllable valve and to the drain, the four-area of the main cavity is larger than the chokes of the chokes, which are made over an additional cavity.