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在毛主席的无产阶级革命路线指引下,在“工业学大庆”的群众运动高潮推动下,根据煤矿生产发展的需要,我们用煤矿已有的EZ—20型岩石电钻改制成适用于井下生产勘探的小型钻机。通过一年多在井下煤岩层中所打的一百多个钻孔的生产实践证明,效果良好。与过去我们一直沿用的红旗150钻机相比较,该小型钻机结构轻便,易于维修,便于操作,不
Under the guidance of Chairman Mao’s proletarian revolutionary line and under the mass climax of “Daqing Industrialization”, in light of the needs of the development of coal mines, we converted the EZ-20 rock electric drill that is already used in the coal mine into a well suitable for underground production exploration Small rig. The production of more than a hundred holes drilled in underground coal and rock formations over a year has proved effective. Compared with the Red Flag 150 drilling rig that we have been using in the past, this small drill has the advantages of light weight, easy maintenance and easy operation,