Four-purpose valve for single hydraulic prop

Abstract

The invention relates to a four-purpose valve for a mine single hydraulic prop, which has the functions of fluid injection, unloading, hyperpressure drainage and pressure display, and guides the pressure of hydraulic fluid inside the single hydraulic prop to a pressure gauge through a connecting screw, a valve bush, a safety valve seal slider, an O-shaped ring and a fluid guiding pipe, and thus, the pressure gauge can constantly display the pressure inside a hydraulic cavity of the single hydraulic prop during supporting, workers can conveniently find out pressure loss phenomenon caused by the internal leakage of a sealing face of the single hydraulic prop, and the occurrence frequency of roof collapse accidents during coal mining is reduced. Meanwhile, the hyperpressure drainage part of the four-purpose valve is the sealing face of a safety valve, which is formed by a conical surface of one section of an inner bore of the valve bush, with certain angle, and a spherical surface of the safety valve sealing slider; and a hyperpressure unloading device of the four-purpose valve, composed of the valve bush, the safety valve sealing slider, a safety valve spring and the fluid guide pipe, has greater drainage capability when larger rock burst occurs and can be used for preventing the rock burst from damaging the single hydraulic prop.

Description

Technical field [0001] The patent of the present invention relates to the core component of the single hydraulic prop used in coal mine roof support - a multi-purpose valve, which is mainly used to complete the liquid injection, unloading, overload protection, and protection of the single hydraulic prop during the roof support process. Indicates the pressure in the hydraulic chamber of the strut. Background technique [0002] The single hydraulic prop is one of the main equipment for coal mine roof support. It is a constant resistance prop with constant working resistance and is suitable for different coal mining faces, different roof conditions and different mine pressures. It cooperates with the metal top beam and is suitable for any coal mining face where the inclination angle of the coal seam is below 35 degrees. The three-purpose valve is the heart of the external injection single hydraulic prop. The prop is lifted and supported by its one-way valve, recovered by its u...

AI Technical Summary

Problems solved by technology

[0003] Single hydraulic props account for a large proportion of coal mine support equipment, but there are still great safety hazards in use: ①Due to the structural characteristics of single hydraulic props, internal leakage is prone to occur when used underground As a result, the internal pressure loss of the hydraulic chamber forms a virtual roof, resulting in a coal mine roof fall accident.

②When a large impact rock pressure occurs, the pillar will shrink by about 0.5-1 mm due to the large impact rock pressure within 0.01-0.03 seconds, because the safety valve in the existing three-purpose valve cannot quickly discharge liquid , leading to the breakage of the welding position of the single hydraulic prop, which leads to the destruction of the prop and forms a certain safety hazard

Poor unloading capability due to small clearance between valve needle and safety valve seat

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