Method for preventing residual coal during top coal caving on fully mechanized caving face

Abstract

The invention discloses a method for preventing residual coal during top coal caving on a fully mechanized caving face. The method comprises the following steps: after caving top coal in previous circulation and drawing a rear conveyor, and further entering into top coal caving in next circulation, firstly, operating a tail beam spile of a fully mechanized caving bracket for inbreak of broken waste rocks in a worked out section from a tail beam, wherein the broken waste rocks are filled in space formed by the rear conveyer moving forward; naturally forming a slope after the space is filled by the waste rocks; then, operating a tail beam jack of the fully mechanized caving bracket to swing the tail beam up and down, wherein at the moment, top coal directly flows into the rear conveyer along the slope of the tail beam and the broken waste rock slope. As the space formed by the rear conveyer which moves forward and the worked out section is filled by broken waste rocks, the top coal recovery rate is improved. The danger of coal spontaneous combustion to generate fire in the worked out section on a working face is further reduced, thereby guaranteeing safe mining of the working face.

Description

technical field [0001] The invention relates to a top-coal recovery process of a fully-mechanized mining top-coal caving face. Background technique [0002] At present, the process flow of fully-mechanized caving working face using fully-mechanized caving supports in coal mines is: cutting coal--push the front conveyor--moving the frame--caving the top coal--pull the rear conveyor--moving the end bracket--reverse Empty knife--Enter the next cycle; the working procedure of top-coal caving is: retract the support shovel plate, retract the tail beam inserting plate at the same time, and then operate the tail beam jack to make the tail beam swing up and down, forming a slope when the tail beam swings down. Coal flows into the rear conveyor along the tailboom ramp (eg figure 1 shown), stop the operation when you see gangue flowing out, and proceed to the next step of pulling the rear conveyor process. In the above process flow, each time the rear conveyor is pulled, due to the ...

AI Technical Summary

Problems solved by technology

In the above process flow, each time the rear conveyor is pulled, due to the forward movement of the rear conveyor and the goaf form a figure 2 The space shown, (the size of the space section is the height of the chute of the rear conveyor 330mm multiplied by the forward distance of 800mm each time, such as figure 2 shown); when the top coal is laid in the next cycle, the coal will fill this space first before entering the rear conveyor. The coal in this space is outside the rear conveyor and cannot enter the rear conveyor, and the coal remaining in the goaf cannot be recovered , resulting in the loss of top coal; at the same time, it aggravates the risk of spontaneous combustion of residual coal in the goaf, which brings major hidden dangers to mine safety production

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