SU185998A1 - - Google Patents

Description

HYDRAULIC DRIVE OF OIL SWITCH

Hydraulic actuators of oil switches are known using a differential hydraulic cylinder as an actuator, the rod cavity of which, in order to quickly return the piston from any position to the initial one, is permanently connected to a pneumohydraulic accumulator or other pressure source. When the switch is turned on, the pressure from the pneumohydraulic or other accumulator (or external power source) is fed through the control device into the piston cavity of the hydraulic cylinder. Due to the difference in effective flow rates; when the piston and rod cavities of the cylinder go, the piston moves in the direction of the rod cavity, displaces the oil from it into the hydraulic accumulator.

The tolling force developed by the hydraulic cylinder with the described switching circuit is proportional to the square of the diameter of the rod.

Since the increase in the diameter of the rod is limited, it is necessary to increase the pressure in the system, or to increase the cylinder dimensions by performing a two-stage rod with a length of each step that is larger than the required piston stroke. This requires careful sealing of the stem at the point of exit of its cylinder. In addition, the constant maintenance of pressure in the rod cavity, acting on the piston and rod seals, increases the reciprocating force of the piston and leads to a rapid deterioration of the seals.

To obtain increased force on the hydraulic cylinder rod operating in a differential switching circuit, without increasing the diameter of the rod, the overall dimensions of the cylinder, or increasing the pressure in order to eliminate external leaks through the rod seal and pinch the piston when it stays under pressure in the proposed device consisting of two hydraulic cylinders - one-sided, one-sided, it is used to turn on the switch, and the additional one is differential, designed to quickly return the piston of the main g drotsilindra from any position in the original, - a differential cylinder formed by a cavity in the piston rod of the cylinder core, and its rod rigidly fixed in the housing base end.

The device eliminates external leakage of working fluid, the need to increase the dimensions of the cylinder operating in a differential circuit, or increase the pressure in the system, reduces or completely eliminates the occurrence of pinching of the piston in the cylinder due to the elimination of "suction of the piston seals and cleaving the annular gap of small section.

cylinder actuator switch; in fig. 2- intermediate position of the cylinder actuator switch during the piston stroke on.

The hydraulic cylinder consists of a main cylinder body 1 with channels 2, 3, 4, 5 and a sealing buffer 6, as well as a rod 7 of the main cylinder with a piston 8. A fixed rod 9 with a piston 10 of the differential cylinder is fixed to the bottom of the body / main cylinder. The liner of the differential cylinder is the rod 7 of the main cylinder. In the fixed rod 9 of the differential cylinder there are channels // and 12 connected to channels 2 and 5 of the main cylinder body. The upper part of the piston 10 of the differential cylinder is made conical, and in the rod 7 there is a conical seat lapped along the cone of the piston 10.

In the initial position, the fluid from the pressure source through the channels 2 w 11 enters the rod cavity of the differential cylinder and keeps it (and hence the piston with the main cylinder rod) in the lowest position. In this case, the piston S presses on the sealing buffer 6, excluding the leakage of fluid from the rod end of the differential cylinder into the piston cavity of the main cylinder, and then through channel 4 to the drain. The conical part of the piston 10 of the differential cylinder is mounted on a conical seat, made in the rod 7 of the main cylinder, which eliminates the flow of fluid from the schtokovoy cavity of the differential cylinder through the channels 12 and 3 to the drain. Channel 5 serves to communicate the rod end of the main cylinder with the atmosphere.

When the command to switch on (see Fig. 2) is transmitted, the oil from the power source through the control valve, channels 3, 12 and 4, flows simultaneously into the piston cavities of the differential and main cylinders. The piston 8 of the main cylinder moves upwards, forcing the oil out of the rod end of the differential cylinder through channels 11 and 2 into the hydraulic accumulator.

Upon completion of the inclusion of the piston cavity of the main cylinder, and therefore

and a differential cylinder, by means of a control unit, is connected with a drain, and the oil pressure in the rod end of the differential cylinder quickly returns the piston 8 of the main cylinder to its original position.

Subject invention

Claims (2)

1.Hydraulic oil switch actuator containing a main cylinder with single acting piston for switching a switch and a piston differential cylinder for returning the piston of the main cylinder from any position to the initial one, characterized in that, in order to provide the necessary working force on the piston of the main cylinder without increasing the overall dimensions and pressure of the system, the cylinder is made in the form of a cavity in the rod the piston of the main cylinder, and its rod. rigidly fixed at one end of the base of the housing. 2. The actuator according to claim 1, characterized in that, in order to prevent the piston from being pinched differential cylinder in the initial position with prolonged exposure to fluid pressure and increase the service life of the differential cylinder seals, the latter are made face. FIG. t ftJs. 2