SU848787A1 - Power hydraulic cylinder - Google Patents

Description

one

The invention relates to mechanical engineering, in particular to mechanical locks for fixing the rod of a power cylinder, and can be used for force cylinders that require fixing and damping the rod in extreme positions.

Closest to the proposed. power cylinder / containing Q rod, floating piston, forming working cavities with the cylinder body, and locking and damping devices MF

A disadvantage of the known ram is the lack of adjustment of the damping force of the rod in the extreme positions.

The purpose of the invention is to regulate the damping force of the rod in extreme positions.

This goal is achieved by the fact that an additional piston is rigidly fixed on the rod, forming, together with the internal surface 25 of the floating piston, additional cavities connected by an adjustable throttle, each of these cavities being connected through an obtatny valve to an unregulated

throttle with the opposite working cavity of the cylinder. In addition, an adjustable choke is made in the rod, and non-adjustable throttle check valves are installed in the floating piston ..

Figure 1 shows the proposed cylinder, a slit, in Figure 2 a check valve with unregulated throttles.

The power cylinder consists of a rod 1 with an additional piston 2 fixed on it, a floating piston 3, locking devices consisting of sleeves 4 fixed on the rod 1 with balls 5, and conical sleeves 6 mounted on the floating piston 3, retaining elements the form of split spring rings -7 and thrust bushings 9,. installed in the housing 8.

The damping device consists of adjustable throttles 10 connecting additional cavities 13 and 14, formed by the inner surface 15 of the floating piston 3 and the rod 1 with the additional piston 2, and the floating piston 3 is equipped with non-adjustable check valves 11 and spring-loaded balls.

12 with a small flow area connecting the additional cavity 13 with the working cavity 16 and the additional cavity 14 with the working cavity 17, i.e. connects additional cavities formed by the inner surface 15 of the floating piston 3 and the rod 1 with the additional piston 2 with opposite working cavities 16 and 17 of the power cylinder. In the upper holder 4, an annular groove 18 is formed.

The device works as follows.

When the rod 1 moves upwards (when compressed air is supplied to the working cavity 17), the floating piston 3 is in the extreme upper position, and the additional piston 2 is in the extreme lower position.

When the cam 1 approaches the upper extreme position, the floating piston 3 stops by the upper thrust sleeve 9, the rod 1 with the additional piston 2 continues to move. The check valve 11 is closed, and the rod 1 is braked by bleeding air from the additional cavity 14 into the additional cavity 13 through the adjustable throttle 10 and slightly into the working cavity 17 through the unregulated throttle 12.

When the upper end position is reached by the stem 1, the spring ring 7 falls into the annular groove 18 of the upper sleeve 4 and the locking device closes, and the additional cavity 13 is connected to the drain through the throttle 12.

When pressure is applied to the working cavity 16, the floating piston 3 travels a distance x and, unclenching the spring ring 7 through the conical sleeve b and the balls 5, releases the rod 1 and continues with it downward movement.

The use of the invention for fixing and damping the rod allows the use of hydraulic cylinders, pneumatic cylinders with such a device for driving various actuators and reducing the wear of its parts.

Claims (1)

1. A power cylinder, containing a rod, a floating piston that forms working cavities with the cylinder body, and locking and damping devices that differ in that, in order to adjust rod damping forces in the extreme positions, an additional piston is rigidly fixed on the rod, forming together with the internal surface of the floating piston additional cavities connected to each other through an adjustable choke, each of these cavities being connected through a check valve to an uncontrollable choke with the opposite working cavity of the cylinder. 2, The hydraulic cylinder according to A.1, about T, l and the fact that the adjustable throttle is made in the rod, and check valves with unregulated throttles are installed in the floating the piston. Sources of information taken into account in the examination 1. USSR author's certificate number 567856, cl. F15 B 15/26, 1973.