在国外钻凿深孔时广泛地采用功率强大的支架式凿岩机和效率为60-250米/班的专门凿岩设备。由于钻具质量高,采用这类凿岩机械是可能的。钎头。根据美国期刊资料,在美国有67．5%的公司采用镶焊硬质合金的钎头,22．5%采用钢钻头,7．5%采用只用一次的钢钎头,2．5%采用镶焊炭化硼的钢钻头。根据建接方式的不同,钻具可按以下方式分类:螺纹连接55．2%,整体钎子22．9%, Widely used in the deep drilling abroad, the powerful power-supported rock drill and the efficiency of 60-250 m / class specialized rock drilling equipment. Due to the high quality of drilling tools, the use of such rock drilling machines is possible. Drill bit. According to the U.S. Journal, 67.5% of companies in the United States use brazed carbide inserts, 22.5% use steel drill bits, 7.5% use only one steel bit, 2.5% Boron carbide welding drill bits. Depending on the mode of connection, the drilling tools can be classified as follows: 55.2% screw connection, 22.9% overall brazing,