Two-way control valve suitable for height adjustment system of short wall shearer

Abstract

The invention discloses a two-way control valve applicable to a rising system of a shortwall coal cutter. The two-way control valve applicable to the rising system of the shortwall coal cutter comprises a hydraulic lock, a one-way throttle valve, a safe relief valve and a reversing valve; the hydraulic lock which comprises a piston and two hydraulic control one-way valves can achieve two-way lock and safe relief of an oil cylinder. According to the two-way control valve applicable to the rising system of the shortwall coal cutter, the reversing valve can move to different working positions (a left position or a right position) under the effect of differential pressure of two chambers of the oil cylinder according to different swinging directions (counterclockwise upward or downward and clockwise upward or downward) of a rocker arm to control communication or disconnection of bilateral oil channels (oil inlet and oil return) and the one-way throttle valve at the same side, a balance loop which adopts the one-way throttle valve to limit speed and the hydraulic control one-way valves to lock is formed particularly when the rocker arm swings downward, the shaking problem of the two-way swinging rocker arm during decreasing in different directions is effectively solved, and operational reliability of a hydraulic system of the shortwall coal cutter is improved.

Description

technical field [0001] The invention belongs to the technical field of coal mining equipment, and relates to a height adjustment system of a shearer, in particular to a bidirectional control valve suitable for the height adjustment system of a short wall shearer. Background technique [0002] In order to meet the high-yield and high-efficiency requirements of the coal seam working face, and to adapt to a wider range of mining heights and supporting requirements, the short-wall shearer has been strengthened, updated and serialized by increasing the installed power and modifying the fuselage and rocker arm. Due to the increase in the weight of the rocker arm and drum, the working load of the oil cylinder became larger. During the height adjustment inspection of the unit, the rocker arm and the height adjustment oil pipe began to vibrate when descending. Since the height adjustment methods and principles of the short-wall and double-drum long-wall shearers are different, the co...

AI Technical Summary

Problems solved by technology

[0005] In addition, the height adjustment system of the short-wall shearer adopts a single-pump system, and its control oil pressure is provided by the back pressure of the oil return. If a balance valve is used, according to the working principle of the balance valve, the back pressure will inevitably cause the opening pressure of the balance valve to be too high. The working pressure of the pump is too high, which affects the reliability of the work

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