SU850949A1 - Hydraulic drive safety apparatus - Google Patents

Description

(54) PUSHING PROTECTION DEVICE

one

The invention relates to hydraulics, in particular, to devices for protecting hydraulic units from excessive pressure build-up.

A safety device for a hydraulic actuator is known, which contains a high-pressure valve, the inlet of which is connected to a pressure head magistrate in the actuator slot, and a drain line til.,.

The known device does not provide reliable operation due to the large pressure variations of the valve actuation and due to the increased deformation of the valve seals.

The purpose of the invention is to increase the reliability of operation and processability.

This goal is achieved by the fact that the device is equipped with a low pressure valve, a compensator and a series-installed throttle and non-return valve, with this high-pressure valve outlet connected to the low-pressure valve outlet, With a compensator and through a throttle, non-return valve to the drain line of the hydraulic drive.

The drawing shows a diagram of the proposed device.

The hydraulic safety device contains a high-pressure valve 1, the inlet of which is connected to the pressure main line 2 of the actuator, and a drain line 3. The device is equipped with a low-pressure valve 4, a compensator 5 and a series-installed choke 6 and a check valve 7, the valve output

10 1 high pressure is connected to the outlet of the low pressure valve 4, with the compensator 5 and through the throttle 6, the check valve 7 to the drain line 3 of the hydraulic drive. The fuse15 filament device is connected with a hydraulic cylinder 8.

The device works as follows.

20

When pressure is applied from the hydraulic system, the working fluid from the hydraulic cylinder 8 (its working cavity) enters the drain line 3. In this case, the fluid leaks through valves 1 and 7 is collected in the compensator 5. At the end of the working stroke, the pressure in the drain line 3 drops and the compensator 5 is empty via dLrosel b

30 W check valve 7.

If an increased load is applied to the stem during the movement of the rod (not shown), then the high pressure valve 1 opens, preventing an excessive increase in pressure. This compensates the compensator 5. When it is filled, the valve 4 opens and the excess liquid is drained. After the cessation of overload, valves 1 and 4 close and compensator 5 is emptied through throttle b, and non-return valve 7.

TciKHM way, the proposed device provides complete tightness in the absence of excessive loads on the hydraulic drive during the entire operation. The absence in the device of elements that are destroyed when triggered increases its operational manufacturability.

Claims (1)

Claims of the invention Hydraulic protection device comprising a high pressure valve, the inlet of which is connected to an actuator pressure line and a drain magistra, characterized in that, in order to increase the reliability of operation and operational efficiency, the device is equipped with a low pressure valve, a compensator and successively installed throttle and return the valve, while the outlet of the high pressure valve is connected to the inlet of the low pressure valve, with a compensator and through the throttle and return valve 5 n - with a drain line of the hydraulic drive. Sources of information taken into account in the examination 1. Basta TM Gidropnezmoavtoma-tika and hydraulic actuator. M ,, Mechanical Engineering, 1972, p. 209, FIG. 156.