Single hydraulic prop hydraulic pressure three-purpose valve

Abstract

The invention discloses a single hydraulic prop hydraulic pressure three-purpose valve, and belongs to the technical field of single hydraulic prop control valves. The single hydraulic prop hydraulic pressure three-purpose valve comprises a left valve cylinder, a right valve cylinder, a one-way valve part and a safety valve part. The one-way valve part comprises a cone valve element, the safety valve part comprises a safety valve needle, the cone valve element and the safety valve needle are provided with evenly-distributed micron-level tiny pits or grooves, the cone valve element is of a two-stage throttling structure, a high-pressure flow guiding through hole is formed in the center of the cone valve element, the one-way valve part further comprises a one-way valve seat, the safety valve part further comprises a safety valve seat and a hexagonal guiding sleeve, the one-way valve seat, the safety valve needle, the safety valve seat and the hexagonal guiding sleeve are all made of Cr-Ni-series cast steel ZG0Cr18Ni9, and meanwhile thermal spraying processing is carried out on engineering ceramics on the surfaces of the one-way valve seat, the safety valve needle, the safety valve seat and the hexagonal guiding sleeve. According to the single hydraulic prop hydraulic pressure three-purpose valve, water can be used as media, pollution resistance and abrasion resistance are good, gas etching can be effectively eliminated, vibration and noise can be reduced, and the single hydraulic prop hydraulic pressure three-purpose valve is safe, environmentally friendly and high in adaptability.

Description

technical field [0001] The invention relates to the technical field of a single hydraulic prop control valve, in particular to a single hydraulic prop hydraulic three-purpose valve. Background technique [0002] The single hydraulic prop is a new environment-friendly support equipment. Because of its large and uniform initial support force and the advantages of constant increase in resistance and drop in distance of the prop, it has been widely used in the coal mine industry. According to incomplete statistics , my country's annual demand for single hydraulic props has exceeded 1.2 million, and it is the country that uses the most single hydraulic props in the world. [0003] The traditional hydraulic medium is mainly hydraulic oil, but due to the disadvantages of hydraulic oil, such as non-renewability, environmental pollution, and easy combustion, people are actively looking for alternative working media of hydraulic oil. The traditional coal mine single hydraulic prop thr...

AI Technical Summary

Problems solved by technology

This technical solution alleviates the problem of emulsion pollution to a certain extent, but it does not fundamentally solve the problems of wear and short service life caused by the use of emulsion; due to the addition of a recovery device, it is inconvenient to use and increases the cost

[0006] In the patent application number published in China: 201020526687.X, a mining single hydraulic prop is disclosed, which mainly includes a top cover, a three-purpose valve, a live column head, a live column barrel, a cylinder body, a piston, a base, The inner surface of the live cylinder is lined with a plastic tube, the top of the plastic tube has a processed flange, the flange is at the joint between the live cylinder and the live cylinder, the live cylinder is pressed against the flange to form a seal, and the lower end of the plastic tube is connected to the piston. The sealing groove corresponding to the circular groove on the inner wall of the living cylinder formed by expanding the diameter, this technical scheme can use water as the working medium, and has no pollution to the environment; but this technical scheme does not solve the problem of air pollution caused by using water as the medium. erosion, vibration, and noise issues

[0007] The application number of the Chinese patent application: 201220459995.4 discloses a mine-used anti-corrosion single hydraulic prop, which belongs to the field of mining machinery. It is structurally composed of: oil cylinder assembly, live column assembly, three-purpose valve, piston, and sealing ring , top cover, base, handle body, valve seat, return spring and other components, the piston and live column assembly are arranged inside the oil cylinder assembly, and the piston is installed at the lower part of the live column assembly, and the oil cylinder assembly and live column assembly pass through the handle body Assembled and fixed with the casting, the valve seat is welded on the live column assembly, a three-purpose valve is arranged inside the valve seat, a sleeve is fixed outside the live column assembly between the handle body and the top cover, and the inside of the oil cylinder assembly and the live column assembly are made of stainless steel composite alloy steel pipe; this technical solution can improve the wear resistance to a certain extent, but the surface friction of parts is inevitable, and it cannot accommodate the wear debris generated by boundary lubrication or dry friction

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