A hydraulic cylinder with self-locking function in retracted position

Abstract

The invention relates to a hydraulic cylinder with a retraction position self-locking function. The hydraulic cylinder comprises a cylinder barrel, an upper end cover, a piston, a piston rod, a lowerend cover, a locking block, a control valve element, a positioning valve element, a first spring and a second spring, wherein the upper end cover is fixedly installed at the upper end of the cylinderbarrel, the piston is slidably arranged in the cylinder barrel and internally provided with a first mounting hole, a second mounting hole and a third mounting hole, the lower end cover is arranged atthe lower end of the cylinder barrel, the locking block arranged in the third mounting hole, the control valve element is arranged in the first mounting hole, and the positioning valve element is arranged in the second mounting hole. According to the hydraulic cylinder with the retraction position self-locking function, self-locking and automatic unlocking at the retraction position can be achieved, the structure is simple, machining is convenient, use is reliable, and damage to an inner hole of the cylinder barrel cannot be caused.

Description

technical field [0001] The invention belongs to the technical field of hydraulic cylinders, in particular to a self-locking hydraulic cylinder. Background technique [0002] Self-locking hydraulic cylinders are widely required in the engineering field, for example, in the mechanical field of many lifting equipment such as metallurgy and coal mines, the hydraulic components are used to prevent the workpiece from being under the action of external force or self-weight (hydraulic cylinder vertical placement) when it stops working. If displacement occurs, the hydraulic cylinder needs to be locked. [0003] At present, the hydraulic cylinder mainly relies on sealing the pressure oil to lock the hydraulic cylinder, which is easy to leak, and "negative pressure effect" and "soft leg phenomenon" occur. Although there are many improved products, the above problems have not been fundamentally solved. When the hydraulic lock is kept at a certain position for a long time, due to proble...

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Problems solved by technology

When the hydraulic lock is kept at a certain position for a long time, due to problems such as pressure oil leakage, the accuracy often cannot meet the requirements, and when the oil circuit fails, the accuracy and reliability cannot be guaranteed; the hydraulic lock often requires a one-way valve , reversing valve and other auxiliary components cooperate to realize the locking circuit. The use of these components makes the whole device occupy a large space. At the same time, the increase in the oil circuit is prone to leakage, causing inconvenience in maintenance and use.

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