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芙蓉矿务局白皎煤矿4层煤处于2层煤之下,倾角5°～7°,厚度2.5～3.5m,储量占总储量的70％。自皎煤矿4层煤的采煤工艺改革,从1970年开始对原设计炮采进行机采试验。当时因采煤机功率小,产量低,机电事故多而下马。1985年改用MLS3-170型采煤机配单体液压支柱试采成功,为采煤机械化发展开辟了道路。实践证明,高档普采比炮采虽减轻了劳动强度,安全较好,单产、工效有一定提高,但回采率低(2.5～3.5m只采2.0～2.2m,损失30％),自燃发火十分严重,经常造成停产、封闭工作面事故,并未达到
The 4-layer coal of Baijiao Mine of Furong Mining Bureau is located under 2-layer coal with a dip of 5 ° -7 ° and a thickness of 2.5-3.5 m, accounting for 70% of the total reserves. Since Jiao Coal Mine 4 layers of coal mining process reform, starting from 1970 on the original design blast mining machine test. Due to shearer power is low, low output, mechanical and electrical accidents and dismount. 1985 switch to the MLS3-170 coal shearer with a single hydraulic prop test success, for the development of coal mining machinery opened the way. Practice has proved that the high-grade Cape mining artillery mining has reduced labor intensity, better safety, yield, labor efficiency has increased, but the recovery rate is low (2.5 ~ 3.5m mining only 2.0 ~ 2.2m, loss of 30%), spontaneous combustion is very Serious, often result in discontinued, closed face accidents, did not reach