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遵照伟大领袖毛主席“开发矿业”的指示,南京战斗机械厂,长沙矿山研究院、河北铜矿及滇中铜矿根据一机部、冶金部下达的中深孔凿岩机研制任务,组成了以老工人为主体的三结合试制小组,在厂、院、矿党委的直接领导下,发扬了“自力更生,艰苦奋斗”的革命精神,紧密依靠群众,试制出 YZ-90型外回转轨道式重型凿岩机。经过反覆试验和不断完善设计,至今年七月份,第三轮样机已在四个不同地区的金属矿山分别完成了万米以上的穿凿炮孔试验。试验结果表明,该机
In accordance with the instructions of the great leader Chairman Mao “Development of Mining”, Nanjing Combat Machinery Plant, Changsha Mine Research Institute, Hebei Copper Mine, and Bozhong Copper Mine formed an old-fashioned drilling machine for medium and deep-hole drilling machines issued by the Ministry of Metallurgy and the Ministry of Machine Building. Under the direct leadership of the factory, the hospital, and the mineral party committee, the three-initiative trial group with workers as the main body carried forward the revolutionary spirit of “self-reliance and hard work” and closely relied on the masses to prototype a YZ-90 type external rotary orbital heavy rock drill. After repeated tests and continuous improvement of design, the third round of prototypes has completed more than 10,000 meters of piercing holes in metal mines in four different regions by July this year. Test results show that the aircraft