Non-equal support control method of advanced hydraulic support

Abstract

The invention discloses a non-equal-strength supporting control method taking the working face fore down-channel stress distribution rule and the top plate condition into consideration. The fore hydraulic supports are divided into multiple groups and controlled in a grouping mode. Different initial supporting strengths are adopted in the groups, and the initial supporting strengths are decreased from the working face to the coal wall in sequence. An adjustable reducing valve or an adjustable overflow valve is arranged between a vertical column hydraulic control one-way valve and a reversing valve of each set of fore hydraulic support, the pressure is not larger than the pressure of a pump station, and the specific value can be adjusted in real time according to the showing of fore mine pressure in the extraction process and the integrity situation of a top plate. According to the non-equal-strength supporting control method, the adaptability of the fore hydraulic supports to the space and time changing rule of the roadway top plate surrounding rock can be improved, the low-initial-supporting-force and large-working-resistance supporting mode is achieved, the damage to the top plate due to repeated supporting is reduced, and the guarantee is provided for safe and efficient mining of coal resources.

Description

technical field [0001] The invention relates to a method for determining the parameters of the roof support of an advanced trough in a fully mechanized mining face, in particular to a method for controlling the segmental unequal strength of the initial support force of an advanced hydraulic support group. Background technique [0002] Before explaining the technical background, first explain the meaning of the following four terms. [0003] Initial support force: The active support force of the column to the roof through pump pressure. A larger initial support force can make the column reach the working resistance faster, reduce the sinking of the roof, and prevent early peeling. [0004] Initial support strength: The initial support force provided by the support to the unit area is called the initial support strength. [0005] Working resistance: When the support works normally, the maximum supporting force on the top plate is called working resistance. After the column sp...

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Problems solved by technology

[0012] Technical problem: The present invention aims at the problem of roof damage and excessive disturbance caused by the use of a single initial support force in the entire support range of the current working face along the trough leading hydraulic support, and proposes the principle of non-equal strength support, and improves the hydraulic system to provide A Realization Method of Segmentation Control

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