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1984—1985年我们分别在山西乡宁煤田及北京史家营煤田，进行绳索取心新型金刚石钻头的试验，其主要目标是提高煤田钻探效率、煤心品质及防止孔斜。经过两年的研究试验，取得良好的效果。1985年平均台效提高78.76％，平均时效提高40—50％，煤心采取率达95％以上，孔斜为1.1度/百米。达到了预期的目标。一九八五年十二月通过部级技术鉴定及验收。
In 1984-1985, we carried out the test of new coring diamond bits on ropes in Xiangning Coalfield, Shanxi Province and Shijiaying Coalfield in Beijing respectively. The main objectives of this project are to improve the drilling efficiency, coal quality and prevent the hole inclination. After two years of research and experiments, achieved good results. In 1985, the average table efficiency increased by 78.76%, the average aging time increased by 40-50%, the coal heart rate was above 95%, and the hole inclination was 1.1 degrees / 100 meters. Achieved the desired goal. In December 1985 through the ministerial technical appraisal and acceptance.