Lifting oil cylinder with rising-end deceleration structure

Abstract

The invention relates to a lifting oil cylinder with a rising-end deceleration structure, which belongs to the technical field of hydraulic oil cylinders. The lifting oil cylinder with the rising-enddeceleration structure includes a cylinder bottom, a cylinder barrel, a plunger, a plunger rod and a cylinder cover, and the specific improvements are as follows: the plunger rod corresponding to theplunger is sleeved with a throttling sleeve through a small clearance fit; the inner end hole of the cylinder cover is a stepped hole, a throttling ring groove and an oil storage ring groove are separately formed between the stepped hole and the radial direction of the plunger rod, and the cylinder cover corresponding to the oil storage ring groove is provided with a small oil hole in the radial direction; and one end of the throttling sleeve corresponding to the cylinder cover is evenly provided with four grooves, and two axial vertical grooves are arranged on the circumference. When lifting,and when the throttling sleeve enters the inner end hole of the cylinder cover, the oil in the cylinder barrel returns from the two vertical grooves; when the throttling sleeve completely enters thethrottling ring groove, the two vertical grooves are closed, and part of the oil enters the gap between the stepped shaft and the throttling sleeve from the four grooves to return oil, and meanwhile passes through the small oil hole on the cylinder cover to return oil, so as to realize a gradual slowdown in lifting speed. The structure improvement of the lifting oil cylinder with the rising-end deceleration structure is simple and reliable, and the manufacturing process is good.

Description

technical field [0001] The invention belongs to the technical field of hydraulic oil cylinders, in particular to lifting oil cylinders for forklifts. Background technique [0002] As an important engineering vehicle, forklifts are widely used in various industries to stack goods. The lifting and lowering of the working device is realized by the telescopic lifting cylinder of the actuator. The stability of the lifting cylinder extending and retracting to the end is also required to be higher and higher. Especially for high-lifting masts, the stability and safety of fully loaded goods when stacking at high positions requires the slowing down of the lifting terminal to achieve. At present, the rising terminal of some domestic forklifts also has a deceleration structure to realize the slow rising function. There are many types of structures, but there are still some problems: 1. The deceleration effect of the lifting terminal of the forklift lifting cylinder is not ideal, and t...

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Problems solved by technology

[0003] In order to solve the problem that the deceleration effect of the existing lifting cylinder is not ideal and there is still a large impact and collision, the invention provides a lifting cylinder with a deceleration structure at the rising end

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