Elastic buffering hydraulic cylinder

Abstract

The invention discloses an elastic buffering hydraulic cylinder, which comprises a piston rod, a cylinder body and a piston, wherein the piston rod has a hollow structure, and a gas cavity is formed in the piston rod; an oil cavity is formed in the cylinder body; high-pressure nitrogen is filled in the gas cavity, and hydraulic oil is filled in the oil cavity; the piston is arranged in the piston rod, and the gas cavity and the oil cavity are partitioned through the piston; an O-shaped sealing ring is arranged between the piston and the inner wall of the piston rod, and a connecting device is also arranged between the piston rod and the cylinder body; a fixed cover is arranged on the outer part of the cylinder body, and a cavity is formed in the fixed cover; a movable cover is arranged on the outer part of the piston rod, the movable cover is a metallic corrugated pipe device, a groove is formed in the cavity of the fixed cover, and the movable cover is embedded into the fixed cover through the groove; and a labyrinth passage is formed between the connecting device and the inner wall of the cylinder body, and a plurality of steel balls for separating the hydraulic oil from the gas are arranged in the labyrinth passage. The protective cover is arranged outside the elastic buffering hydraulic cylinder, and an internal medium is safe and leak-free, so that effective elastic buffering is produced in a compression travel.

Description

technical field [0001] The invention relates to an elastic cushioning hydraulic oil cylinder, in particular to a hydraulic oil cylinder which uses high-pressure nitrogen to play a buffering role and has a protective device. Background technique [0002] In the single-piston hydraulic cylinder in the prior art, one end of the piston enters oil and the other end outputs oil. When conventional hydraulic cylinders are used in heavy hydraulic machinery such as weight lifters, excavators, bulldozers, forklifts, etc., there is often hydraulic oil leakage. The safety effect is poor and the buffer capacity is not enough. [0003] At the same time, because the traditional hydraulic cylinders are basically exposed during operation, most of them do not have protective covers, so the hydraulic cylinders, especially the piston rod structure, are not well protected, and dust and foreign objects in the environment are easy to collide or enter the hydraulic cylinders , thus wearing and dest...

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Problems solved by technology

[0002] In the single-piston hydraulic cylinder in the prior art, one end of the piston enters oil and the other end outputs oil. When conventional hydraulic cylinders are used in heavy hydraulic machinery such as weight lifters, excavators, bulldozers, forklifts, etc., there is often hydraulic oil leakage. Poor safety effect and insufficient buffer capacity

[0003] At the same time, because the traditional hydraulic cylinders are basically exposed during operation, most of them do not have protective covers, so the hydraulic cylinders, especially the piston rod structure, are not well protected, and dust and foreign objects in the environment are easy to collide or enter the hydraulic cylinders , so as to wear and damage the cylinder, making the leakage more serious, reducing the service life and greatly increasing the failure rate

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