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遵照毛主席关于“开发矿业”的指示,为尽快改变我国大型冶金露天矿穿孔设备落后的局面,鞍钢大孤山铁矿和鞍山黑色金属矿山设计院组成工人、干部和技术人员“三结合”的钻机攻关组。攻关组在矿党委的领导下,依据洛阳矿山机器厂早期制造的YZL-1型液压卡盘式牙轮钻机近五年的试验成果,经过三个月会战,终于在1971年5月1日将YZL-1型牙轮钻机改制成HYZ-250型滑架式牙轮钻机(图1),并投入工业试验。以后,
In accordance with Chairman Mao’s instructions on “mining development”, in order to change as soon as possible the backward situation of perforation equipment in large-scale metallurgical open-pit mines in our country, the Dagushan Iron Mine and Anshan Ferrous Metal Mining Design Institute of Ansteng formed a “triple combination” of workers, cadres and technicians Rig research group. Research team under the leadership of the mine party committee, based on Luoyang Mining Machinery Factory earlier manufactured YZL-1 type hydraulic chuck disc cone drill nearly five years of experimental results, after three months of battle, and finally in May 1, 1971 will be YZL-1 type cone drill converted into HYZ-250-type roller cone drill (Figure 1), and put into industrial tests. after,