Mining method of top coal caving with oblique cutting in steeply inclined seam

Abstract

An oblique slicing section top-coal-caving coal mining method for a steeply pitching coal seam is disclosed. The method includes following steps: (1) dividing sections along the pitching direction of the coal seam; (2) respectively digging a transportation roadway and a return airway on a top plate and a base plate in each section, and communicating to form a U-shaped ventilation stope working face, with the angle alpha between the stoping working face and the horizontal plane being not more than 40 degrees; (3) arranging a fully mechanized caving support, a front scraper conveyer, a back scraper conveyer, a coal cutter, and other devices on the stoping working face; (4) allowing the coal cutter to cut coal along the stoping working face by back and forth movement, allowing the cut coal to drop into the front scraper conveyer, and conveying the cut coal out; (5) opening a coal discharging opening of the fully mechanized caving support to allow caved top coal to drop into the back scraper conveyer, and to be conveyed out; and (6) moving the fully mechanized caving support, the front scraper conveyer and the back scraper conveyer forward along with the coal cutter. The method increases the degree of mechanization and safety of mines and largely increases the yield, the work efficiency and the recovery ratio.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to a coal mining method for steeply inclined coal seams. Background technique [0002] For the mining of steeply inclined coal seams with an inclination angle of more than 40° and a thickness of 6-20 m, the coal mining method with flexible shield support is generally used in my country, but this coal mining method has the following defects: [0003] ① The ventilation is unstable, and blasting is used to drop coal, so the safety and reliability are low; [0004] ②The work efficiency is low, the labor intensity of the workers is high, and the number of workers in each shift of the mining face is 20-25; [0005] ③ The output of the mine is small, and the annual output of a single mining face can only reach 100,000 to 150,000 tons; [0006] ④ recovery rate of 40% to 50%. [0007] In view of the existence of many defects in the mining of steeply inclined coal seams by the existing...

AI Technical Summary

Problems solved by technology

[0008] The purpose of this invention is to provide a kind of coal mining method that is more than 40 ° to the coal seam inclination angle, and the thickness is 6~20m steeply inclined coal seam, to solve the problem of mining safety and mining of steeply inclined coal seam in existing flexible cover support coal mining method. Defects in methods such as efficiency, labor intensity and recovery rate

Images