Initiative top coal caving crushing hydraulic support

Abstract

The invention relates to an initiative top coal caving crushing hydraulic support, which solves the problems that the existing top coal caving hydraulic support is poor in top coal caving crushing effect and influences the yield of top coal. The initiative top coal caving crushing hydraulic support comprises a base and a top beam, wherein an inner top beam is embedded in the middle part of the top beam, inner telescopic stand columns which are hinged with the inner top beam and the base are arranged between the inner top beam and the base, outer telescopic stand columns which are hinged with the top beam and the base are arranged between the top beam and the base at the outer side of the inner top beam, an impact vibration platform is arranged at the upper end of each inner top beam, an inner coal breaking plate is arranged at the upper end of the impact vibration platform, and outer coal breaking plates are respectively arranged on the upper end surface of the top beam at the left side and the right side of the impact vibration platform. By adopting the initiative top coal caving crushing hydraulic support, a coal caving arch structure is destroyed, and the efficiency for crushing the top coal is improved; moreover, the top coal can be crushed into loosened coal sheets and can be effectively discharged from a coal caving opening; and the lifting frequency of the inner and outer telescopic stand columns and the movement frequency of the inner top beam and the coal breaking plates are controlled by virtue of an overflow valve. The initiative top coal caving crushing hydraulic support has the advantages of simple structure, convenient operation and low cost.

Description

Technical field [0001] The invention relates to a hydraulic support for underground coal mines, in particular to a hydraulic support for active top coal crushing. Background technique [0002] With the development of top coal mining technology, the requirements for the performance of hydraulic supports have gradually increased. In the process of top coal caving mining, the top coal can only be discharged from the caving mouth only when the top, middle or tail of the support beam is completely changed into loose and broken coal. Under special conditions such as shallow depth and hard top coal, the leading support pressure of the working face is not enough to crush the top coal to a suitable size, resulting in a low top coal recovery rate. [0003] The existing hydraulic supports used in the top coal mining process cannot actively and effectively break the top coal and increase the top coal caving rate, which is not conducive to the crushing of the medium-hard top coal and affects t...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the existing top-coal caving hydraulic support has poor top-coal crushing effect and affects the top-coal recovery rate, the present invention provides a top-coal caving active crushing hydraulic support

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