Opening/closing mechanism of safety valve

Abstract

The invention discloses an opening / closing mechanism of a safety valve. The opening / closing mechanism comprises a liquid feeding connector provided with a liquid feeding hole, and further comprises a valve element assembly which can move relative to the liquid feeding connector and is used for controlling the on / off of the liquid feeding hole, wherein the valve element assembly comprises a nut and a valve pad arranged in the nut; the valve pad is provided with a sealing surface matched with the liquid feeding connector; the valve pad has a concave structure. According to the opening / closing mechanism of the safety valve, provided by the invention, the movable valve element assembly is matched with the liquid feeding connector, and the movable valve element assembly can be used for controlling the on / off of an oil path from the liquid feeding hole to a liquid discharging hole; when the valve element assembly is far away from the liquid feeding connector, large-flow overflowing can be realized and the flow of the safety valve is greatly improved; axial displacement of the valve element assembly can be shortened by rapid overflowing within short time; the axial displacement of the valve element assembly is shortened so that axial deformation of a resetting spring can be reduced; finally, pressure fluctuation can be reduced.

Description

Technical field [0001] The invention belongs to a hydraulic support for fully mechanized coal mining. Specifically, the invention relates to an opening and closing mechanism of a safety valve. Background technique [0002] With the large-scale implementation and development of hydraulic supports for fully mechanized coal mining, the requirements for hydraulic supports for fully mechanized mining are becoming more and more stringent. This puts further requirements on the safety valves of the hydraulic cylinders of the supports, especially the safety valves. There are further requirements for the service life and reliability of the stent. When the pressure from the top of the hydraulic support causes being driven, whether the safety valve can withstand high pressure in a short time and timely and fully stable unloading directly affects the service life of the support And support safety. It not only damages seals, pipes and hydraulic components, but also causes vibration and noise;...

AI Technical Summary

Problems solved by technology

[0004] The overflow channel of the existing safety valve adopts the liquid passage hole arranged around the side wall of the valve core. The diameter of the liquid passage hole is small, resulting in small discharge flow and large flow loss. The seat bears the axial force exerted by the return spring, which leads to poor stress on the valve core and large pressure fluctuations during the working process, which leads to generally unsatisfactory closing pressure of the safety valve, and eventually leads to failure of the hydraulic components connected to the safety valve. Such as excessive loss of oil in the high-pressure cylinder, resulting in waste

The sealing effect between the spool and the valve sleeve is not ideal, and the processing accuracy of the groove on the surface of the spool for installing the seal is not easy to control

In addition, the spring cavity inside the valve housing is in an open state, and the dustproof, waterproof and rustproof effects are poor, which reduces the service life of the safety valve

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