Coal leakage prevention top coal caving hydraulic support

Abstract

The invention discloses a top coal caving hydraulic support capable of preventing coal leakage. The top coal caving hydraulic support comprises a hydraulic support body and a tail beam. The tail beam comprises a back supporting plate and side protecting plates, supporting baffles are fixed to the inner sides of the side protecting plates on the two sides, a telescopic inserting plate is installed in the tail beam, and the side protecting plates and the supporting baffles form a track for the inserting plate to move; rectangular groove bodies are formed in the two sides of the inserting plate, springs are installed at the bottoms of the groove bodies, and pop-up baffles are installed in the groove bodies in a matched mode; the upper portion width of the side, located on the rail, of each baffle is smaller than the lower portion width, an arc-shaped step is formed between the upper portion and the lower portion, and after the baffles pop up, the maximum distance of the ends, below the arc-shaped step, of the baffles on the two sides is not smaller than the width of the tail beam. And the bottom of the side protection plate is in contact fit with the arc-shaped step, so that the baffle is pressed into the groove body when the insertion plate retracts into the tail beam. The problems that loose coal is scattered to the lower portion through gaps between the inserting plates, and the rear scraper is prevented from moving forwards or even floating upwards are effectively solved, the structure is stable and reliable, and damage is not likely to happen.

Description

technical field [0001] The invention relates to the field of hydraulic supports for coal mines, in particular to an anti-leakage coal caving hydraulic support. Background technique [0002] The top-coal caving mining method is to arrange a coal mining face with a mining height of 2 to 3 m along the floor of the coal seam or the bottom of a certain thickness range of the coal seam when mining a thick coal seam. After the top coal is broken into loose bodies, it is discharged from the "coal discharge window" behind or above the support, and is transported out of the working face by a scraper conveyor. [0003] When the roof-coal caving hydraulic support is working, most of the inserts protruding from the tail beam are trapezoidal inserts. When the adjacent roof-coal caving hydraulic support inserts are opened, they cannot form a closed space at the rear, so that the caving The loose coal above the coal hydraulic support leaks down in the gap between adjacent inserting plates,...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an anti-leakage coal caving hydraulic support, by setting a baffle in the insert plate, so as to solve the problem that the coal leakage behind the top coal caving hydraulic support affects the forward movement of the rear scraper

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