Switching on and switching off mechanism of safety valve

Abstract

The invention discloses a switching on and switching off mechanism of a safety valve.The mechanism comprises a liquid inlet connector with a liquid inlet, the mechanism further comprises a valve element assembly which can move relative to the liquid inlet connector and is used for controlling opening and closing of the liquid inlet, the valve element assembly comprises a sliding base, a thread sleeve and a valve pad, the thread sleeve is arranged in the sliding base, the valve pad is arranged in the thread sleeve, and a spherical groove is formed in the valve pad.According to the switching on and switching off mechanism of the safety valve, the movable valve element assembly is matched with the liquid inlet connector, the valve element assembly can be used for controlling on and off of an oil path from the liquid inlet to a drainage hole, large flow overflow can be realized when the valve element assembly is away from the liquid inlet connector, the flow of the safety valve is increased greatly, axial displacement of the valve element assembly can be reduced by the aid of short-time rapid overflow, axial deformation of a reset spring can be reduced by reducing the axial displacement of the valve element assembly, and finally pressure fluctuation can be reduced.

Description

technical field [0001] The invention belongs to coal mine fully mechanized mining hydraulic support, in particular, the invention relates to an opening and closing mechanism of a safety valve. Background technique [0002] With the large-scale implementation and development of coal mine fully mechanized mining hydraulic supports, fully mechanized mining work has more and more stringent requirements for hydraulic supports, so there are further requirements for the safety valve of the hydraulic cylinder of the protection support, especially for the safety valve There are further requirements for the service life and reliability of the hydraulic support. When the pressure from the top of the hydraulic support causes passive force, whether the safety valve can unload in a short time, fully and stably under the condition of high pressure directly affects the service life of the support. and support security. It will not only damage seals, pipes and hydraulic components, but also...

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

Images