Roof brushed frame moving valve of hydraulic support for coal mine

Abstract

The invention discloses a roof brushed frame moving valve of a hydraulic support for a coal mine. The roof brushed frame moving valve comprises a valve body, a high-pressure liquid inlet, a liquid returning opening and a control liquid opening, wherein the high-pressure liquid inlet, the liquid returning opening and the control liquid opening are formed in the valve body; the valve body is internally provided with a hydraulic control one-way valve and a one-way valve; a working cavity of the hydraulic control one-way valve is communicated with the high-pressure liquid inlet; an unloading cavity of the hydraulic control one-way valve is communicated with a liquid inlet of the one-way valve; a liquid outlet of the one-way valve is communicated with the liquid returning opening; the control liquid opening is communicated with the lower end face of an ejection rod of the hydraulic control one-way valve. The roof brushed frame moving valve disclosed by the invention has the advantages that a frame can be moved under pressure when the hydraulic support works under a well, that is, a roof beam and a roof plate can contact mutually all the time when the hydraulic support is moved and the hydraulic support also has certain supporting force on the roof plate when the hydraulic support is removed, so as to prevent an unstable direct roof, a false roof or a crushed roof from caving and puking. Meanwhile, when the hydraulic support is moved, a column does not need to be descended and only pressure in a stand column of the hydraulic bracket needs to be reduced to a pre-set value to carry out frame moving operation.

Description

technical field [0001] The invention relates to a hydraulic support used in an underground fully mechanized mining face of a coal mine, in particular to a hydraulic support wiping and moving valve for a coal mine. Background technique [0002] The hydraulic support needs to move forward during the coal mining process of the fully mechanized mining face in the coal mine, and the movement cycle of the hydraulic support is carried out in the way of "column lowering-column moving-column lifting". For relatively hard roofs, there is no problem with this working cycle method, but for unstable direct roofs, false roofs or geological conditions with broken roofs, such a working cycle process has great potential safety hazards. The main reason is that : The hydraulic support must first lower the column before moving the frame. After the support lowers the column, the unstable direct roof, false roof or broken roof will sink, break, and collapse due to repeated support, resulting in r...

AI Technical Summary

Problems solved by technology

For relatively hard roofs, there is no problem with this working cycle method, but for unstable direct roofs, false roofs or geological conditions with broken roofs, such a working cycle process has great potential safety hazards. The main reason is that : The hydraulic support must first lower the column before moving the frame. After the support lowers the column, the unstable direct roof, false roof or broken roof will sink, break, and collapse due to repeated support, resulting in roof leakage or roof fall accidents. Possesses a very large safety threat to underground workers

At the same time, the support must be lowered before the column can be moved, and the operating handles of the two control valves need to be operated in sequence, which increases the labor intensity of the operator and reduces the coal mining efficiency.

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