目前我国大型露天矿穿孔广泛使用美国进口的45—R、60—R型牙轮钻机及国产的KY—250、KY—310型牙轮钻机。在中小露天矿许多矿山仍然使用KQ—150型潜孔钻机及钢绳穿孔机。KQ—150钻机是我国60年代的定型产品,但与200毫米孔径的潜孔钻机比较,其生产率只有后者一半。钢绳穿孔机是卅年代的老 At present, the large-scale open pit perforation widely used in the United States imported 45-R, 60-R-type cone drill and domestic KY-250, KY-310-type cone drill. Many mines in small and medium open pit mining still use KQ-150 DTH drilling rig and wire rope piercing machine. KQ-150 drilling rig is a stereotyped product of China in the 1960s, but compared with the 200mm hole diameter downhole drilling rig, its productivity is only half of the latter. Steel wire punching machine is old age