印度丹巴德矿业学院副教授P·森著文详述了露天矿牙轮穿孔和冲击钻进技术的发展现状,其要点如下。大直径炮孔虽然现在大多数炮孔孔径介于170～254毫米之间,但有几家制造厂最新设计的钻机用于钻进更大直径的炮孔。现在已有可穿凿直径达559毫米炮孔的牙轮钻机和钻进直径达254毫米炮孔的冲击钻机 P Sen, Associate Professor, Faculty of Mines, Bhutan University, India, described in detail the current state of the development of perforation and impact drilling technology in open pit mines. The key points are as follows. Large Diameter Borehole Although most borehole diameters now range between 170 and 254 mm, several newly manufactured rigs are used to drill larger bore holes. Now there are cone-drill rigs that can drill chisels up to 559 mm in diameter and drill holes up to 254 mm in diameter