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在毛主席“开发矿业”的伟大指示鼓舞下,在批林整风和批林批孔运动的推动下,宣化风动机械厂、鞍钢矿山研究所、鞍钢弓长岭铁矿在有关单位的积极协作下,试制成功了我国第一台QZ—250型大孔径新型露天潜孔钻机。今年1～4月,在弓长岭铁矿进行了工业性试验,4个月共完成矿岩穿孔总量11363米,其中穿矿(f=14～18)5443米,穿岩(f=8～14)5920米,穿爆矿岩130多万吨,平均月进尺2840米,4月份台月进尺最高为4060米,比目前使用的БС—1型冲击钻机提高效率3～5倍。6月中旬在弓长岭铁矿做了样机鉴定。与会代表一致认为,QZ—250型露天潜孔钻机具有穿孔直径大(超过国内外目前所有潜孔钻机)、效率高、钻具结构简单、操作
Inspired by Chairman Mao’s great instruction of “mining development”, the active cooperation of Xuanhua Fengdong Machinery Research Institute, Ansteel Mining Research Institute and Anshan Iron & Under the successful trial of China’s first QZ-250 large aperture new open-air DTH drilling rig. From January to April this year, an industrial experiment was carried out in Gongchangling iron ore mine. In the 4 months, a total of 11,363 meters of ore perforation was completed, in which 5,443 meters of ore dressing (f = 14 to 18) ~ 14) 5920 meters, wearing explosive rock more than 130 million tons, the average monthly footage of 2840 meters, in April the maximum footage of 4060 meters in Taiwan, than the currently used БС-1 hammer drill to improve the efficiency of 3 to 5 times. In mid-June Gongdingling iron mines made a prototype identification. Participants agreed that, QZ-250 open-hole drilling machine with a large diameter perforated (more than all the current down-hole drilling rig at home and abroad), high efficiency, simple drilling structure, operation