Bypass-air-return top coal caving mining system of extra-large-dip medium-thickness coal seam

Abstract

The invention has the beneficial effects that, through technological connection of a roadway channel and a bypass-air-return roadway and technological connection of a lower air-inlet transport roadwayand an artificial gob-side entry retaining wall, a U-shaped ventilation system is formed; timely ventilation during coal mining is ensured; through exploitation layout of the roadways and installation of mining equipment, a large-angle fake-dip long-arm mining of an extra-large-dip medium-thickness coal seam is changed to a vertical-caving top coal mining mode, so coal between the lower air-inlettransport roadway and an upper gas roadway can be recovered effectively, and mechanical mining of the extra-large-dip medium-thickness coal seam is realized; safety problems of extra-large-dip mechanical mining are effectively solved, and mining efficiency is high; and mining equipment is stable and easy in installation.

Description

Technical field [0001] The invention belongs to the technical field of mining engineering, and in particular relates to a top coal caving mining system for a medium-thick coal seam with a bypass return air and a super large inclination angle. Background technique [0002] The occurrence conditions of mining steep coal seams have always been the focus of attention in the industry. Due to the difficulty of mechanized mining of steeply inclined coal seams, the mining of steeply inclined coal seams usually adopts blasting mining or abandoned mining, which leads to a lot of waste of resources, low production efficiency, and frequent safety accidents. Therefore, how to mine coal resources safely and effectively under the condition of steep coal seams is one of the problems to be solved in the coal industry. [0003] The evolution of domestic mining methods for steep coal seams can be summarized in the following five stages: [0004] The first stage of development: At the beginning of 195...

AI Technical Summary

Problems solved by technology

[0010] like figure 1 and figure 2 As shown, the working face of the pseudo-slanted long arm of the traditional flexible shield support is arranged as a coal seam 104, a rock formation 102, a broken rock formation 101, a bypass air return roadway 105, a support 103, and a lower air inlet transportation roadway 106, and the coal seam inclination angle is in the range of 45 to 90 degrees. , due to the large inclination angle, the anti-fall and anti-skid of fully mechanized mining equipment cannot be set, the personnel are not good at construction management, the safety hazard is great, and it is difficult to realize mechanized mining

Images