SU522996A1 - A device for fixing pistons of hydraulic cylinders - Google Patents

Description

one

A device is known for fixing the pistons of hydraulic cylinders used in reciprocating hydraulic actuators, containing balls placed in the annular groove of the cylinder body and a spring-loaded floating splinter interacting with the balls.

A disadvantage of the known device is that the balls do not burst in the annular groove, as the floating piston departs, compressing the spring, when there is pressure of liquid overpressure on the drain, which occurs when controlling the speed of movement of the hydraulic cylinder rod by throttling the flow rate of the drain or when the hydraulic cylinder is operating. pump on a closed circuit.

The purpose of the invention is to increase the reliability of the fixing device at any pressure of the liquid overpressure on the discharge.

To do this, both cavities of the floating piston; on the side of the spring and on the side of placement of balls in the annular groove of the hydraulic cylinder are connected to each other through a choke, whereby the fluid pressure in both cavities is equalized and the floating piston forces the spring in the annular groove of the hydraulic cylinder, does not react to pressure backwater. To ensure conditions

opening, i.e., the exit of the balls from the annular groove, the cavity of the floating piston from the spring placement side is connected to the second working cavity of the hydraulic cylinder with a pipeline with a non-return valve built into it.

The drawing shows the proposed device, a longitudinal section.

In the nests Porshn 1 cylinder 2 posted

balls 3, which are unfolded by a spring-loaded floating piston 4 in an annular groove of the hydraulic cylinder body 5. The floating piston cavity on the spring placement side is connected to both working cavities of the hydrocylicer: one cavity through the throttle gap of the throttles 6, and the other through a check valve 7 Cylinder 2 has two inlets 8 and 9. The device operates as follows.

The working fluid injected into the cylinder through the opening 8 moves the piston 1 with the balls 3 to the extreme left position and closes the check valve 7. The displacement 1 displaces the fluid from the other cavity

the cylinder to drain through the opening 9. For this, the floating piston 4 is in the extreme right position, pressed by the spring force, without being displaced from the pressure of the liquid supporting fluid on the drain, because through the gap

throttle 6 fluid pressure equalizes

on both sides of the spring-loaded floating piston.

At the approach of the piston 1 to the extreme left position, the balls 3, rippled by the floating piston 4, sink into the annular groove of the cylinder body 5, thereby fixing the position of the piston.

The exit of the balls from the annular groove occurs when the flow of fluid through the hole 9.

The floating riopnieHb 4 leaves the liquid head to the left, compressing the spring and displacing the fluid through the pipeline through the check valve 7 into the drain cavity of cylinder 2. At the same time, the liquid from the pressure chamber of the cylinder will also be throttled to drain through the throttle gap of the throttle 6, therefore the gap of the throttle must be performed may be small. The cross-sectional area of the throttle slit is determined by the time required to return the spring-loaded floating gear 4 to the extreme right position.

Claims (1)

Invention Formula A device for fixing the pistons of hydraulic cylinders, which contains balls placed in the annular groove of the cylinder body and a spring-loaded floating bearing that interacts with the balls, which is the case; This is due to the fact that, in order to increase the reliability of the device, the cavity of the floating 1, its piston from the spring side is hydraulically connected to one of the working cavities of the hydraulic cylinder through the throttle, and on the other through a check valve.