Optima design method of hydraulic support based on beam-free end distance high-strength protection side

Abstract

The invention relates to an optimal design method of a hydraulic support based on a beam-free end distance high-strength protection side, and belongs to the technical field of coal mine production. According to the method, a telescopic beam is lengthened, a slide way upper cover plate is arranged in a slide way, an inclined strut jack connected with a protection side is arranged on the lower portion of a top beam, and meanwhile a small flow pump and a bypass pressure increasing valve are arranged at a liquid inlet of a stand column jack and a liquid inlet of a protection side jack so as to form a second independent hydraulic system. Through optimization, the upper cover plate of the slide way avoids the coal accumulation problem of the telescopic beam; the telescopic beam is lengthened, so that the empty top distance is effectively shortened; the inclined strut jack greatly enhances the horizontal supporting force of the protection side; the double hydraulic systems are adopted, so that the initial supporting force of the stand column jack and the side protection jack is greatly improved. Various properties of the hydraulic support are greatly optimized, the problems of rib caving and roof caving of the large-mining-height working face are thoroughly solved under the action of the telescopic beam, the inclined strut jack and the double hydraulic systems, and the hydraulic support is worthy of application and popularization.

Description

technical field [0001] The invention belongs to the technical field of coal mine production, and in particular relates to a large mining height hydraulic support for fully mechanized mining working faces in coal mines, in particular to an optimal design method for a hydraulic support based on beamless end-distance high-strength side protection. Background technique [0002] For coal mine fully mechanized mining face, during the mining process, when the roof lithology is dominated by mudstone and sandy mudstone, advanced fractures often occur, leading to the occurrence of side slabs and roof fall events. Especially for the working face with large mining height, due to its large mining height and large support height adjustment range, the shearer pulls the frame slowly after coal cutting, so it is difficult to support in time, and the side and roof fall are more obvious. [0003] According to research, at present, most mines in my country use the one-shot full-height coal mini...

AI Technical Summary

Problems solved by technology

[0004] ①The telescopic beam of the hydraulic support has a short telescopic amount, and the support distance is insufficient. When the coal shearer cuts coal, the support cannot be effectively supported in time, and then the space between the roof is too large, and there is a risk of roof fall;

[0005] ②When a roof fall occurs, the telescopic side protection mechanism of the bracket is released in time, but due to the limitation of the space position and the structural form, the upward support angle of the side protection jack is very small, and the upward support force is insufficient, which cannot meet the support requirements;

[0006] ③ The active support force of the support to the roof is not enough, resulting in a large force on the coal side, and the phenomenon of flaking;

[0007] ④ When the sidewall phenomenon occurs, the sidewall is punched out to support the coal wall, but the horizontal and axial support force is not enough to meet the support requirements

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