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甘肃省机械工业总公司于1986年11月28日在天水组织召开了YT24、YT28型气腿式凿岩机活塞、螺旋棒、转动套、钎套、螺旋母五种基础件5000米攻关成果鉴定会。参加会议的有22个单位的39名代表。会上,天水风动工具厂参加攻关的同志介绍了五种基础件的材料研究、新工艺的选定、寿命攻关总结及考核结果。参加试验的矿山代表分别介绍了五种基础件矿山试验条件和试验情况。与会代表认为:YT24、YT28型气腿式凿岩机基础件的寿命攻关,经矿山实际使用除YT28型气腿式凿
On November 28, 1986, Gansu Provincial Machinery Industry Corporation convened the appraisal meeting on the achievement of 5000 meters of the five basic components of YT24 and YT28 type air leg rock drill piston, screw rod, rotating sleeve, drill sleeve and spiral mother. 39 delegates from 22 units attended the meeting. At the meeting, Tianshui Fengdongju Tools Factory to participate in research comrades introduced the five basic parts of the material research, the selection of new technology, life research summary and assessment results. Representatives of the mine who participated in the experiment introduced the test conditions and test conditions of the five basic pieces of mines respectively. Participants said: YT24, YT28-type air leg rock drill basic life-long tackle, the mine actually used in addition to YT28 type air leg type chisel