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1988年中南地质勘探局下达给308大队研制多功能取心钻具的科研任务,旨在为解决在金矿复杂地层提高矿心采取率的机具技术课题。经过两年多时间的努力,通过多次修改完善、设计,试制出了HZ-308多功能取心钻具.在金矿生产试验中,平均矿心采取率达91％,在我局东城铀矿点,使用该钻具以来,矿心采取率由原来的20％左右上升达92％,深受广大钻探工人和地质,探矿技术人员的好评和赞扬.该钻具于1989年10月17日在河南通过技术鉴定.
1988 Zhongnan Geological Exploration Bureau issued to the 308 brigade to develop multi-purpose coring drill scientific research mission aimed at solving the mining complex in the gold mine to improve the rate of mining technology issues. After more than two years of hardworking, HZ-308 multi-purpose coring drill has been designed and manufactured through several modifications and improvements. In the gold production test, the average mining rate is 91%. In our bureau, Dongcheng uranium Mine point, the use of the drilling tool, the mining rate taken from the original 20% up 92%, by the majority of drilling workers and geology, prospecting technical staff praise and praise of the drill on October 17, 1989 In Henan through technical appraisal.