上海工业战线的广大职工坚持“独立自主,自力更生”的方针,破除迷信,解放思想,在较短的时间里,制造成一台开发煤矿用的大型竖井钻机。经一年多钻井实践证明:大钻机的质量好、功率大,机械化程度高,操作简便,安全可靠。这样的大型钻机,在国内还不多,它的钻头的最大直径为7.4m,钻井设计深度可达500m。大钻机的制成,为我国发展矿业 The broad masses of workers in the industrial front of Shanghai adhere to the principle of “independence and self-reliance” and have eliminated superstitions and emancipated their minds to produce a large shaft drilling rig for the development of coal mines in a relatively short period of time. After more than a year of drilling proved: large drill quality, power, high degree of mechanization, easy to operate, safe and reliable. Such a large rig, not much in China, its largest drill diameter of 7.4m, drilling depth of up to 500m. Large drilling machine made for the development of mining in our country