A multi-stage lifting cylinder with hydraulic buffer function

Abstract

The invention relates to the technical field of lifting equipment, in particular to a multi-stage lifting cylinder with a hydraulic buffer function. The multi-stage lifting cylinder comprises a cylinder seat, an outer cylinder barrel, a first-stage cylinder, a second-stage cylinder, a third-stage cylinder, one-way valve assemblies and a knuckle bearing. The cylinder seat is fixedly connected with the outer cylinder barrel, the first-stage cylinder is arranged inside the outer cylinder barrel, the second-stage cylinder is arranged inside the first-stage cylinder, and the third-stage cylinder is arranged inside the second-stage cylinder; and the knuckle bearing is fixedly connected with the third-stage cylinder. When the second-stage cylinder shrinks to the bottom, the second-stage cylinder and the first-stage cylinder are matched to form a first throttle clearance; when the third-stage cylinder shrinks to the bottom, the third-stage cylinder is matched with the second-stage cylinder to form a second throttle clearance; and the bottom of the first-stage cylinder and the bottom of the second-stage cylinder are each provided with one one-way valve assembly. According to the multi-stage lifting cylinder provided with the hydraulic buffer function and provided in the embodiment, the second-stage cylinder and the third-stage cylinder cannot generate strong impact, stable running of the lifting cylinder is ensured, and the service life of the lifting cylinder is prolonged.

Description

technical field [0001] The invention relates to the technical field of lifting equipment, in particular to a multi-stage lifting cylinder with a hydraulic buffer function. Background technique [0002] The lifting system on large and heavy engineering equipment has the characteristics of large tonnage, long stroke, and small installation spacing. Therefore, the lifting system of large and heavy engineering equipment usually uses multi-stage lifting cylinders. The two-stage oil cylinder with the smallest rod diameter in the traditional multi-stage lift cylinder has no cushioning function when it is retracted. When the cargo in the equipment cargo box is not completely unloaded or is empty due to the lifting point, the load of the cylinder is still large, so the emergency landing cargo When the tank is used, due to the small volume of the forced landing cavity and the high linear velocity of the forced landing, the two-stage oil cylinder with the smallest rod diameter will pro...

AI Technical Summary

Problems solved by technology

[0003] The embodiment of the present invention provides a multi-stage lift cylinder with a hydraulic buffer function, which solves the problem that the two-stage oil cylinder with the smallest rod diameter among the multi-stage lift cylinders in the prior art will generate strong impact and easily damage the lift cylinder. Technical problem, realize the hydraulic buffering of the second and third cylinders in the multi-stage lifting cylinder, so that the second and third cylinders will not produce strong impact, and ensure the stable operation of the lifting cylinder

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