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我矿使用的73－ZOO、KQ－2O0潜孔钻钻头为广200C型潜孔往齿钻头，原平均使用寿命为600m／个。据统计，1978～1993年共消耗钻头6973个，平均每年463个。近年来由于延米爆破量的提高，或孔术道减少，每年消耗钻头3O0—～33O个，每个钻头171O元，每年钻头费用为56万元。1995年我矿
The 73-ZOO, KQ-2O0 DTH drill bit used by mine is a wide 200C DTH drill bit with an average original service life of 600m / pcs. According to statistics, a total of 6973 drills were consumed between 1978 and 1993, with an average of 463 per year. In recent years, due to the improvement of the amount of blasting, or the reduction of holes and trunks, 300 to 33O drill bits are consumed each year, and 171O yuan for each drill bit. The annual drill cost is 560,000 yuan. I mine in 1995