Long-distance visible high-flow pressure display and memory type safety valve

Abstract

The invention provides a long-distance visible high-flow pressure display and memory type safety valve. The safety valve comprises a valve seat integrated with a spring case and a valve head, a pressure adjusting nut is arranged at the inner upper end of the valve seat, a floating screw seat is arranged on the middle-lower portion, and a compression spring is arranged between the pressure adjusting nut and the floating screw seat. The valve head in the lower portion is internally provided and connected with a sealed guide sleeve through a guide sleeve sealing ring, the guide sleeve is internally provided with and connected with a floating valve spool through a valve spool sealing ring, and the floating valve spool with multiple drain holes is provided with an annular boss. The upper end of the floating valve spool is connected and sealed with the lower end of a balance screw seat in the floating screw seat via a balance gasket. A memory ring, a sliding sleeve and a flexible dustproof ring are arranged outside the valve seat, and the memory ring and the sliding sleeve are connected and fixed with the floating screw seat via a connecting rod and through a guide slide groove so as to realize synchronous link. The safety valve can not only meet and adapt to instantaneous high-pressure-impact quick high-flow unloading, but also display and memorize changes of working pressure of a support column at any time. Within an adequate range, hydraulic safety supporting condition can be observed at a long distance even if in the environment without sufficient light.

Description

technical field [0001] The invention relates to a coal mine fully mechanized mining hydraulic support and a spring type safety valve for the hydraulic support. Background technique [0002] At present, although there are many types of spring-type safety valves used on hydraulic supports and hydraulic props in coal mines at home and abroad, their basic principles and structures are roughly the same, that is, they use compression springs to control a valve with many overflow valves along a circular annulus. The semi-hollow sliding valve core of the hole, adjust the compression spring according to the pressure requirement to realize the opening and closing action of the safety valve. Long-term use has proved that various types of safety valves currently in use still have many deficiencies, such as: Chinese patent ZL2012 2 0532252.5 discloses a multi-purpose hydraulic prop in a "double liquid injection double seal display pressure memory type single hydraulic prop". valve, whic...

AI Technical Summary

Problems solved by technology

Long-term use has proved that various types of safety valves currently in use still have many deficiencies, such as: Chinese patent ZL2012 2 0532252.5 discloses a multi-purpose hydraulic prop in a "double liquid injection double seal display pressure memory type single hydraulic prop". valve, which is set on the safety valve in the multi-purpose valve described in [0016], adopts a pointer type display pressure gauge to realize dynamic pressure display and memory function, so that the operator can observe and understand the pressure of the pillar in time Changes and leakage, but can not meet the requirements of instant high-pressure impact rapid unloading and long-distance observation of pressure changes and leakage of a single hydraulic prop

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