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第一机械工业部、冶金工业部、煤炭工业部于1978年11月14日至16日在承德大庙铁矿召开YGZ-70型独立回转凿岩机鉴定会。会上长沙矿山研究院和南京战斗机械厂做了关于YGZ—70型外回转凿岩机的研制和试验情况的报告。邯邢煤炭指挥部立井工程处和大庙铁矿分别介绍了该凿岩机使用情况,并组织代表们观看了现场技术表演。会议认为YGZ—70型凿岩机体积小,结构紧凑,外型美观。其结构主要特点是采用冲击和回转
First Machinery Industry Department, Ministry of Metallurgical Industry, Ministry of Coal Industry November 14, 1978 to 16 in Chengde Diantu iron ore held YGZ-70 type independent rotary rock drill identification. At the meeting, Changsha Institute of Mining and Nanjing Fighting Machinery Factory made a report on the research and test of YGZ-70 type rotary drilling machine. Handan Xing coal mine headquarters and Ongui iron ore mine were introduced the use of the rock drill, and representatives of the organization on-site technical performances. Meeting that YGZ-70 rock drill small size, compact structure, good looks. The main features of its structure is the use of impact and rotation