A high-speed cutting longwall mining method for thin and medium-thick coal seams

Abstract

The invention discloses a high-speed cutting longwall-mining method for low coal seams and medium-thickness coal seams. The cutting resistance is reduced by reducing a web, so that a normal coal cutting speed reaches 15-40 m / min; by using a low-web bidirectional high-speed coal cutting process for left triangular coals, after triangular coals are completely cut, returning to cut the other half of triangular coals is not required, but continuing to carry out ascending (descending) coal cutting is performed; and reciprocating mining is performed in such a way. By adopting the spaced quick moving of brackets, every two circulating brackets move at a synchronized interval. Through the timing optimization of production takts, by using a space-time coordinated continuous operating method, each workday is uniformly divided into six (or eight) time intervals, a maintenance operation and a shutdown-required roadway operation are arranged in the third time interval, and coal cutting and non-shutdown-required roadway operations are arranged in the rest of time intervals. According to the invention, the low-web bidirectional high-speed coal cutting process for left triangular coals, moving brackets in a grouped, spaced and staggered mode, and the space-time coordinated continuous operating method are adopted, so that the shortcomings of slow advance speed and low mining efficiency of low coal seams and medium-thickness coal seams are made up, thereby providing a feasible mining method for the high-speed cutting of low coal seams and medium-thickness coal seams.

Description

technical field [0001] The present invention designs a coal mining method for thin and medium-thick coal seams, specifically a 0.8-3.5m thick coal seam high-speed cutting longwall mining method. Background technique [0002] Thin and medium-thick coal seams are limited by the thickness of the coal seam, resulting in a relatively narrow working space. It is impossible to arrange high-power fully mechanized mining equipment. The contradiction between equipment capacity and size is prominent. The complete set of equipment is small in size and high The contradiction of stability requirements is prominent, and it is difficult to realize the high power of shearer and scraper conveyor with short fuselage. At present, comprehensive mechanized mining of thin coal seam and medium-thick coal seam has been realized in many domestic mining areas, but it is limited by the thickness of coal seam and coal cutting. The speed has caused my country's thin and medium-thick coal seam output to fai...

AI Technical Summary

Problems solved by technology

[0004] During each coal cutting cycle, the end oblique cutting knife cutting triangular coal and the end preparation time occupy about half of the entire coal cutting cycle time, which is limited by the power of the comprehensive machine equipment, the reliability and stability of the equipment At present, the cutting speed of the shearer in the fully mechanized mining working face of the thin coal seam and medium-thick coal seam in my country is generally 4~6m / min. When the height is small, the diameter of the shearer drum is small, and the coal loading effect is poor, and the greater the cutting depth is, the worse the coal loading effect is, and the pushing scraper conveyor is not in place, and it is often necessary to run empty knives to load coal, which affects the pushing speed and speed of the working face. Productivity

[0005] The reasons for the low cutting speed of the shearer are not only the performance limitations of the shearer itself and the constraints of the mining conditions of the working face, but also the moving speed and method of the hydraulic support are also important factors. The frame-by-frame moving method lags behind a certain distance, and its moving speed is difficult to keep up with the high-speed traction of the coal shearer. The work at the end of the working face and the roadway is not synchronized and uncoordinated with the coal cutting and equipment maintenance operations on the working face, which takes up a lot of manpower and Working time is an important factor affecting the availability rate and production efficiency

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