End mechanical self-locking hydraulic cylinder with buffering function

Abstract

The invention provides an end mechanical self-locking hydraulic cylinder with a buffering function. A groove is formed in the inner wall of a cylinder barrel, a cylindrical hole is formed in a piston, a locking block is installed in the cylindrical hole, and the locking block and the groove are matched and used for self-locking and unlocking of the hydraulic cylinder. A sealing ring is arranged between the locking block and the inner wall of the cylindrical hole, the piston is provided with a hydraulic oil channel, hydraulic oil reaches a one-way valve in the middle of the piston through the channel, and the cylindrical hole is communicated with the one-way valve. The cylinder bottom is provided with a one-way throttling valve, and when the hydraulic cylinder retracts and gets close to the cylinder bottom, the buffering function of the hydraulic cylinder is achieved. By means of the hydraulic cylinder, reciprocating of a common hydraulic cylinder can be achieved, and the retraction stroke tail end self-locking and retraction stroke tail end buffering functions can also be achieved.

Description

technical field [0001] The invention belongs to the technical field of hydraulic pressure, and more specifically relates to a mechanical self-locking hydraulic cylinder at the end with buffer. Background technique [0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swing motion). When it is used to realize reciprocating motion, the deceleration device can be omitted, and there is no transmission gap, the motion is stable, and it is widely used in various hydraulic systems. [0003] According to work requirements, sometimes it is necessary for the workpiece to keep its position for a certain period of time after it moves to a certain position or after the workpiece stops working. In order to prevent the workpiece from being displaced under the action of external force, gravity and other forces, the hydraulic cylinder is required to be locked at this time. At present, the self...

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Problems solved by technology

At present, the self-locking of the hydraulic cylinder is mainly realized by blocking the pressure oil. However, the hydraulic oil in this locking method is easy to leak, and the "negative pressure effect" and "soft leg phenomenon" will occur after the hydraulic oil leaks. , made a lot of improvements, but none of them fundamentally solved the above problems

In order to realize the self-locking of the hydraulic cylinder, the hydraulic lock can also be used, but the hydraulic lock has leakage problems during the self-locking process. After the leakage, the self-locking precision is not high and the workpiece displacement phenomenon occurs. When the oil circuit failure occurs, the accuracy and reliability It is even more impossible to guarantee, so the hydraulic lock cannot realize the self-locking of the hydraulic cylinder for a long time; and the hydraulic lock often needs multiple auxiliary components such as a one-way valve and a reversing valve to work together to realize the self-locking of the hydraulic cylinder. The high cost of the lock also occupies more space when realizing self-locking. At the same time, the number of oil passages increases the possibility of leakage, which brings inconvenience to maintenance and use.

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