Nitrogen safety valve used by coalmine fully-mechanized mining hydraulic bracket

Abstract

The invention discloses a nitrogen safety valve used by a coalmine fully-mechanized mining hydraulic bracket. The nitrogen safety valve comprises a valve casing and a valve core, wherein the valve core is internally placed in a valve hole of the valve casing, unloading holes are formed in the outer walls of the valve core and the valve casing, one end of the valve casing is connected with an oil cylinder of the hydraulic bracket, the other end of the valve casing is connected with one end of a threaded sleeve, the other end of the threaded sleeve is closed, an oil inlet is formed in the valve casing, a gas storage cavity is formed in the threaded sleeve, nitrogen is stored in the gas storage cavity, the valve hole and the oil inlet are communicated with the gas storage cavity, and the valve core in the valve hole is reset under the action of the nitrogen in the gas storage cavity. Compared with the prior art, the nitrogen safety valve has the advantages that the properties of the nitrogen are fully utilized through the arrangement of the gas storage cavity storing the nitrogen on the safety valve, the safety valve is used in a wider range of pressure than a mode of adopting a spring in resetting, super-high pressure can be bore, the spring force is constant, and the size is small.

Description

technical field [0001] The invention relates to a coal mine fully mechanized mining hydraulic support, in particular to a nitrogen safety valve used for a coal mine fully mechanized mining hydraulic support. 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 that there are further requirements for the safety valve of the hydraulic cylinder of the protection support, especially for hydraulic supports The service life and reliability of the large-flow safety valve used on the road have further requirements. When the pressure from the top of the hydraulic support causes passive force, can the safety valve fully and stably unload in a short time under the condition of high pressure? The load directly affects the service life and support safety of the bracket. It will not only damage seals, pipes ...

AI Technical Summary

Problems solved by technology

The safety valve is reset by a spring, but the pressure range of the spring is small, and it cannot withstand ultra-high pressure, so the pressure range of the safety valve is small, and the use of the safety valve is limited. In addition, the spring occupies a large space, which makes the volume of the safety valve smaller. Large, the spring needs to be preloaded to achieve the required spring force, and the spring force is not constant

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