SU1513244A1 - Self-reversing reciprocating hydraulic gear - Google Patents

Abstract

The invention relates to mechanical engineering, in particular to reciprocating hydraulic actuators with automatic reversing. The aim of the invention is to increase the reliability of the device. This is achieved by the fact that the working cavities of the hydraulic cylinder communicate with the source of pressure and discharge through independent hydraulically controlled spools with spring-loaded working bodies. Moreover, the working cavities are in communication with spring batteries equipped with springs of different stiffness, installed with different preloads, and the control cavities of the spools are interconnected through chokes. 3 il.

Description

The invention relates to mechanical engineering, in particular to reciprocating hydraulic actuators with automatic reversing.

The aim of the invention is to increase the reliability of the self-reverse hydraulic drive.

FIG. 1 shows a diagram of a self-reversing hydraulic drive when the cylinder piston is in the middle position; FIG. 2 is a diagram of a self-reversing hydraulic drive when the piston moves to the right; FIG. 3 is a diagram of a self-reversing hydraulic drive when the piston moves the cylinder to the left.

The hydraulic actuator consists of hydraulic cylinder 1, control unit 2, pipelines 3 and 4, and a power source (not shown).

Hydraulically controlled spools 5 and 6, throttles 7 and 8 and spring accumulators 9 and 10 are located in the bores of the control unit 2.

Working bodies 11 and 12 spools 5 and 6 and pistons 13 and 14 of batteries 9 and 10 are loaded with springs 15-18. The control cavities 19 and 20 communicate with each other through the throttle 7, and the control cavities 21 and 22 through the throttle 8.

The choke 7 is made with a greater coefficient of hydraulic resistance than the choke 8. The spring 17 has a lower rigidity and is installed. Lena with less preliminary resistance compared to the spring 18.

The working cavities 23 and 24 and the spring batteries 9 and 10 are communicated by COOT01

with

1HE

14

31513

with independent outputs 25 and 26 spools 5 and 6.

The initial position of the device corresponds to figure 1. When the pressure is applied, the fluid enters the outlets 25 and 26 of spools 5 and 6. Spring 17, which creates less effort compared to spring 18, compresses, providing fluid flow through throttle valve 8, thereby moving the operating member 12 of spool 6 upwards (Fig. 2) and the cavity 24 is connected to the drain. When the piston 1 approaches the right extreme position, the flow of fluid through the throttle 8 stops, the pressure drop across the throttle 8 disappears and the working body 12 is returned to its original position by the action of the spring 16. The pressure at the outlet 26 of the core 6 increases by compressing the spring 18, thereby causing fluid flow and pressure drop across the throttle 7, the working body 11 of the valve 5 rises, together with the cavity 23 and the battery 9 with the drain. The piston of the hydraulic cylinder 1 starts to move to the left and the piston 13 returns to its initial position. After the arrival of the piston of the hydraulic cylinder 1 to the extreme left position

The device's operation cycle is repeated.

Claims (1)

Invention Formula A self-reversing reciprocating hydraulic actuator comprising a hydraulic cylinder whose working cavities communicate with a power source and drain through at least one hydraulic control valve, the control cavities of which are communicated with a pressure source through a throttle, and control elements of a spool with spring-loaded working elements, characterized by that, in order to increase reliability, the control elements of the spool are made in the form of spring-loaded batteries equipped with springs of various rigidity, each of the working cavities of the hydraulic cylinder is connected with the output of the independent hydraulic operated spool and spring accumulator, the control cavities of the hydraulic actuators of the hydraulic actuators are interconnected through the throttle, and the working elements of the hydraulic actuating spools are spring-loaded. W 7 C) ig.1 910