在煤巷和半煤岩巷道掘进时,采用煤电钻打眼,煤尘和岩尘浓度达170mg/m~3。采用喷雾防尘和煤电钻侧式供水,实现湿式打眼,粉尘浓度降为20mg/m~3。近年来,我矿为推广电钻湿式打眼对电钻侧式供水装置进行了改进。从1980年起,我矿学习外单位的经验,开始推广使用电钻侧式供水湿式打眼,但一 Coal roadway and semi-coal rock roadway heading, the use of coal drilling drilling, coal dust and rock dust concentration of 170mg / m ~ 3. The use of spray dust and coal side drill water, wet drilling, dust concentration reduced to 20mg / m ~ 3. In recent years, mine mine to promote electric drilling wet eye drill on the water side of the device has been improved. Since 1980, my experience in mining outside units began to promote the use of electric drill side wet wet drilling, but one