Coal blasting production method increasing lump coat rate

Abstract

A coal blasting production method increasing lump coat rate is characterized in that transverse-row punching for parallel seams is carried out on a mining face, each row includes equally spaced hole groups, each hole group includes a charging hole, an upper guide hole and a horizontal guide hole which are distributed in a congruent triangle form, a row of the hole groups is distributed on the coal seam thicker than 0.6 to 1.2m, punching is oriented at an inclination angle of 0-5 degrees and a down-pitch angle of 8-12 degrees, two rows of the hole groups are distributed on the coal seam thicker than 1.2-2m, a second row of the hole groups is arranged at a down-pitch angle of 0-5 degrees, and tangent lines of the two rows of the hole groups are superposed. Explosive is positively charged to the bottom of each charging hole, and an opening of the charging hole is sealed by mud. An opening of each guide hole is sealed by mud, and the guide holes are connected in series from bottom to top. After the explosive is initiated, the bottom of each coal seam is emptied, and fissure planes are located from bottom to top for digging. After the explosive is initiated, oxidized gases in the charging holes are peaked, the guide holes are compressed, stretched and cracked, the gases in lines and planes are ejected and shot forward to cut and separate coal, coal lumps are large and massive, the lump coal rate is more than 70%, production is safe, work efficiency is high, and benefit is fine.

Description

technical field [0001] The invention relates to a coal production method, in particular to a production method for blast mining and falling coal that increases the lump coal rate. Background technique [0002] At present, in the traditional blasting and coal-dropping method used in coal mine mining, the blast hole is arranged in a single hole, and the high-temperature and high-pressure gas generated by igniting the explosive radiates and expands to the surroundings, and the tightly compressed coal seam rubs and squeezes each other violently, resulting in a large damage range. The lump coal rate is low. Contents of the invention [0003] The purpose of the present invention is in order to overcome above-mentioned weak point, and provide a kind of blast mining coal production method that improves the lump coal rate, reduces the amount of coal. [0004] For realizing above-mentioned purpose of the invention, the concrete production method that the present invention adopts is...

AI Technical Summary

Problems solved by technology

[0002] At present, in the traditional blasting and coal-dropping method used in coal mine mining, the blast hole is arranged in a single hole, and the high-temperature and high-pressure gas generated by igniting the explosive radiates and expands to the surroundings, and the tightly compressed coal seam rubs and squeezes each other violently, resulting in a large damage range. Low lump coal rate

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