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甘肃省机械工业总公司于1985年4月23日在天水组织召开了YT28型气腿式凿岩机活塞、螺旋棒、钎套、传动螺母、螺旋母五个基础件攻关成果鉴定会。参加鉴定会的有领导机关、高等院校、科研院所、矿山用户、行业厂等12个单位,36名代表。会上,天水风动工具厂参加攻关的同志详细介绍了五个基础件的材料研究、新工艺选定、寿命攻关总结及考核结果;参加工业试验的矿山代表分别介绍了五个基础件矿山试验条件和试验的情况。鉴定委员会对提交鉴定的攻关成果进行了认真的审查和讨论,并考查了生产现场。
On April 23, 1985, Gansu Provincial Machinery Industry Corporation convened the identification meeting of five basic components of YT28 type air leg rock drill piston, screw rod, drill sleeve, drive nut, and screw nut. There are 12 units and 36 representatives participating in the appraisal meeting, including leading organs, universities, research institutes, mine users and industry factories. At the meeting, the comrades involved in tackling the problems in the Tianshui Fengdongju Tool Factory introduced the materials research, new process selection, life research summary and assessment results of the five basic parts in detail; the mine representatives who participated in the industrial tests introduced five basic pieces of the mine test Conditions and test conditions. The appraisal committee conducted a careful review and discussion on the achievements of the examination submitted and examined the production site.