Two-prop shielding type electro-hydraulic-control top-coal caving hydraulic support

Abstract

The invention discloses a two-prop shielding type electro-hydraulic-control top-coal caving hydraulic support. By the aid of the hydraulic support, the problems that existing four-prop hydraulic supports are stressed unevenly, damaged easily and moved slowly are solved. A top beam is in an integrated structure, two upright props which are arranged on the left and right sides are arranged between the top beam and a base, tops of two upright props are inclined forwards, an electro-hydraulic control system which is communicated with a cavity of each of the upright props is arranged inside the cavity, electro-hydraulic control systems comprise double-inlet double-return quick liquid inlet and return systems, upright props are communicated with a quick-liquid-supply hydraulically-controlled one-way valve and a hydraulically-controlled one-way valve, the quick-liquid-supply hydraulically-controlled one-way valve is communicated with an electro-hydraulic-control reversing valve, the return disconnection valve is communicated with the electro-hydraulic-control reversing valve and the hydraulically-controlled one-way valve, an automatic back-flushing filter is communicated with the quick-liquid-supply hydraulically-controlled one-way valve and the electro-hydraulic-control reversing valve, and the electro-hydraulic-control reversing valve is communicated with the hydraulically-controlled one-way valve. The hydraulic support is reasonable and reliable in structural design, the working resistance reaches 17000kN, and the automatic exploitation of fully mechanized caving units with 10-20m super high seams can be achieved.

Description

technical field [0001] The invention relates to a hydraulic support for underground coal mines, in particular to a two-column shielding type electro-hydraulic control caving hydraulic support. Background technique [0002] Thick coal seam reserves of key state-owned coal mines in my country account for 44%, and the output of thick coal seam mining accounts for more than 45%. At present, the mining methods of thick coal seams in key coal mines in my country mainly include fully-mechanized top-coal caving mining and fully-mechanized mining with large mining height. The thickness of the coal seam is 4-7m, and the hardness of the coal seam is relatively high. High mining. For the mining of many extra-thick coal seams with a thickness of 10-20m, large-scale high-level top-coal caving mining is adopted. At present, four-pillar large-scale high-level top-coal caving supports are basically used in China. [0003] The four-column support cover-type top-coal caving hydraulic support ...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of unbalanced force on the existing four-column hydraulic support, easy damage to the support and slow moving speed, the present invention provides a two-column shielding type electro-hydraulic control top coal caving hydraulic support

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