Switching mechanism of safety valve

Abstract

The invention discloses a switching mechanism of a safety valve. The switching mechanism comprises a liquid inlet connector with a liquid inlet hole, and a valve element assembly capable of moving relative to the liquid inlet connector and used for controlling the opening and closing of the liquid inlet hole, wherein the valve element assembly comprises a sliding seat, a swivel nut arranged in the sliding seat, and a valve pad arranged in the swivel nut. According to the switching mechanism of the safety valve, the movable valve element assembly is arranged to be matched with the liquid inlet connector; the valve element assembly can be used for controlling the on-off of an oil path from the liquid inlet hole to a liquid discharge hole, after the valve element assembly is far away from the liquid inlet connector, mass-flow overflow can be realized, the flow rate of the safety valve is greatly increased, quick overflow in a short time can reduce the axial displacement of the valve element assembly, the axial displacement reduction of the valve element assembly can decrease the axial deformation of a reset spring, and finally pressure surge can be lowered.

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, unloading fully and stably in a short time and in a timely manner directly affects the service life of the support And support safety. It not only damages seals, pipes and hydraulic components, but also causes vibrati...

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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