A hydraulic drilling and blasting mining method for extremely thin coal seams

Abstract

The invention discloses a hydraulic drilling and bursting exploitation method for an ultra-thin coal seam. The hydraulic drilling and bursting exploitation method is characterized by comprising the following steps that a, a power pump, a scraper conveyor; a transfer conveyor, a belt conveyor, a hydraulic auger miner, a bursting device and a bastard coal washing mud-water separating system are placed in a machine tunnel; b, holes are drilled through hydraulic power, and specifically a set of hydraulic power drilled holes are formed in a coal face; c, coal discharging holes are formed in the lower ends of the hydraulic power drilled holes; d, the bursting device is placed in one hydraulic power drilled hole, and crushed coal passes through the coal discharging holes and falls onto the scraper conveyor; e, the crushed coal is transported through the scraper conveyor, the transfer conveyor and the belt conveyor; f, each coal discharging hole is sealed after the coal in the corresponding hydraulic power drilled hole is completely discharged; and g, the step c to step f are repeated in the pushing exploitation direction. According to the exploitation method, a coal worker does not need to enter the coal face, so that the safety is greatly improved, the labor intensity of the coal worker is relieved, and mechanical unmanned exploitation of the ultra-thin coal seam mining face larger than 50 degrees is achieved.

Description

technical field [0001] The invention relates to a coal mining method, in particular to a hydraulic drilling and blasting mining method of an extremely thin coal seam. Background technique [0002] In the field of coal mining, a coal seam with a thickness of less than 0.8m is called an extremely thin coal seam. The purpose of ultra-thin coal seam mining is to prevent resource loss and control gas mines for protective layer mining. Compared with thick and medium-thick coal seams, the mining of extremely thin coal seams has the following characteristics: ①The mining height is low, which is not conducive to the use of large-scale mining equipment; ②The working conditions are poor and the equipment is difficult to move; Low benefit. The mining of extremely thin coal seam is one of the effective technical approaches to realize the sustainable development of coal resources, and its mining technology research has become one of the important research directions of coal mining. [0...

AI Technical Summary

Problems solved by technology

[0003] At present, there are two kinds of mechanized mining methods applicable to extremely thin coal seams with a coal seam dip angle below 50°: one is comprehensive mechanized mining with a mining height of ≧1 m coal-rock mining and high-grade general mining with a mining height of ≧0.7 m; It is a large-diameter drilling method. This large-diameter drilling method has a low coal recovery rate and a high 10,000-ton tunneling rate, and the coal seam inclination angle is less than ≦ 30°

For the mining of extremely thin coal seams with an inclination angle of more than 50°, the relatively backward manual blast mining method is currently used, and coal mining workers need to work on the working face. This blast mining method has high labor intensity, poor safety, and poor economic benefits. and low production efficiency

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