Single-rod inlet and outlet bi-direction equal-load hydraulic cylinder

Abstract

Disclosed is a single-rod inlet and outlet bi-direction equal-load hydraulic cylinder. The single-rod inlet and outlet bi-direction equal-load hydraulic cylinder comprises a first end cover, a second end cover, a cylinder tube, a piston, a hollow piston rod, an auxiliary pipe and a control valve. The piston is arranged in the cylinder tube. A piston rod hole is formed in the second end cover, and the inner end of the hollow piston rod passes through the piston rod hole and is fixedly connected with the piston. An auxiliary pipe hole is formed in the piston, the first end of the auxiliary pipe passes through the auxiliary pipe hole and is arranged in the hollow piston rod, and the second end of the auxiliary pipe is fixedly connected with the first end cover. A first oil opening and a second oil opening are formed in the two ends of the cylinder tube respectively, a third oil opening is formed in the first end cover, the second end of the auxiliary pipe is connected with the third oil opening, and the first oil opening, the second oil opening and the third oil opening are connected with the control valve through oil pipes. According to the single-rod inlet and outlet bi-direction equal-load hydraulic cylinder, due to the design of the auxiliary pipe and the hollow piston rod, an oil inlet channel is expanded, the contact surface of hydraulic oil in the process of forward movement is changed, and the advantages of a conventional double-acting double-rod hydraulic cylinder and a conventional double-acting single-rod hydraulic cylinder are integrated.

Description

technical field [0001] The invention relates to a hydraulic cylinder, in particular to a single-rod entry-exit bidirectional equal-load hydraulic cylinder. Background technique [0002] A hydraulic cylinder is an actuator that converts hydraulic energy into mechanical energy and drives moving parts to do reciprocating linear motion or reciprocating swing. It has simple structure, accurate positioning and stable movement, and is widely used in hydraulic systems of various mechanical equipment. [0003] A typical hydraulic cylinder structure consists of an end cover, a cylinder barrel, a piston rod, a buffer device and a sealing device. According to different modes of action, hydraulic cylinders can be divided into two categories: single-acting and double-acting. Single-acting hydraulic cylinders use pressure oil to push the piston rod to move in one direction, while the movement in the opposite direction relies on gravity or springs. [0004] Double-acting hydraulic cylind...

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Problems solved by technology

[0005] The existing double-acting double-rod hydraulic cylinder occupies a large space and is not suitable for installation in relatively narrow areas; the thrust output of the double-acting single-rod hydraulic cylinder in the positive and negative directions is not equal, which cannot meet the requirements of some hydraulic systems. Requirements for forward and reverse equal load

The reason is that the stroke of the moving part driven by the double-acting double-rod hydraulic cylinder is three times the effective stroke of the piston rod, which is greater than the stroke of the moving part driven by the general hydraulic cylinder, so this hydraulic cylinder occupies a large space

For the double-acting single-rod hydraulic cylinder, the difference in the contact area of ​​the pressure oil leads to the difference in the output thrust during forward and reverse movement.

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