Coal mining method of lengthened front-beam fully-mechanized mining and fully-mechanized top coal carving of three-soft coal seam and equipment

Abstract

The invention discloses a coal mining method of a lengthened front-beam fully-mechanized mining and fully-mechanized top coal carving of a three-soft coal seam and an equipment. The invention is characterized in that the front end of the expansion front end of a fully-mechanized mining hydraulic bracket is provided with the lengthened front beam, a hydraulic cylinder of the expansion front beam isextended after a coal mining machine cuts coal; one part of the front end of the lengthened front beam extends into a coal wall so as to lead the lengthened front beam to support a top plate or top coal; then a scraping plate conveyor is gradually moved to be close to the coal wall behind the coal mining machine; then the hydraulic bracket is moved forward; at the time, the hydraulic cylinder ofthe expansion front beam is in retracted state again; and and top coal carving at the rear part is carried out at the place where the hydraulic bracket is moved. The invention can control the top coalor the top plate at the coal slide of the coal wall of fully-mechanized caving working face and the fully-mechanized mining working face of the three-soft unstable coal seam to lead the top coal or the top plate not to have the occurrence of leakage and roof fall and is characterized by moving the bracket fast, saving cost, having simple technique, being safer, saving working hour and having highproduction efficiency and the like.

Description

technical field [0001] The invention relates to a coal mining method and equipment, in particular to a coal mining method and equipment for three-soft coal seam lengthened front beam fully mechanized mining and fully mechanized top coal caving. Background technique [0002] "Three soft" coal seam coal mining face refers to the working face where the roof is unstable, easy to fall, the coal seam is soft, the hardness coefficient f<1.0, the compressive strength of the easy side and the bottom plate is low, and the support base is easy to sink into the bottom. In top-coal caving mining, the roof of the working face is soft coal, and the roof fall is very easy to occur before the frame. Preventing coal wall slabs and advanced roof caving is the key to mining "three soft" coal seams. The mining of the three soft coal seams has always been a difficult problem nationwide, and it is difficult to control safety, and the recovery efficiency is also very low, and no better method h...

AI Technical Summary

Problems solved by technology

The mining of the three soft coal seams has always been a difficult problem in the whole country. It is also difficult to control the safety, and the recovery efficiency is also very low. A better method has not been found yet.

The reasons are as follows: firstly, the third soft coal seam will become muddy when it encounters water, which will reduce the permeability of the borehole and hinder the infiltration and diffusion of Marisan; become one

As a result, in the process of mining, the coal wall often leads to leakage and roof fall, blocks the ventilation and pedestrian passages of the mining face, and crushes the scraper conveyor of the mining face, which brings many safety hazards and seriously restricts the safe production of the mining face. It also requires a lot of money and manpower

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