22及25毫米的六角钎杆,即小钎杆,是主要的凿岩工具,其消耗量约占钎钢总量的90％左右。小钎杆在凿岩过程中常被卡在炮孔中难以拔出,由此而造成的钎杆消耗在钎杆总消耗量中占较大比重。例如,梅山铁矿某次工业性试验中,钎杆折断、炸顶及堆顶而造成的钎杆消耗为2573根次,因卡钎拔不出来放炮后崩弯无法继续使用的钎杆达2322根次,卡钎占钎杆总 22 and 25 mm hexagonal drill rod, that is, small drill rod, is the main rock drilling tool, which consumes about 90% of the total amount of drill steel. Small drill in the rock drilling process often stuck in the hole is difficult to pull out, resulting in the consumption of drill rod in the total consumption of drill rod account for a large proportion. For example, in an industrial test at the Meishan Iron Mine, the amount of drill rods consumed by the breakage of the drill rods, the top of the fryers and the top of the pile was 2,573 times, and the number of drill rods up to 2322 The second time, the card brakes accounted for the total drill rod