Based on the investigation on homemade spindle core drilling machine,designing plan was put forward to dual-use drilling tower for vertical and inclined holes,which changed the history that homemade spindle core drilling machine could not be used in inclined hole construction,further developed application range of homemade spindle core drilling machine.

Based on the drilling effects of 75 mm wire-line coring drilling by CS14 fully hydraulic driving head drill in Kangbao copper mine and polymetallic ore in Mongolia,the paper made the analysis on the advantages and disadvantages compared with spindle drilling machine and put forward the opinion that driving head drill was the trend in developing geological coring drill in China.

The present status and prospect of mineral exploration drilling market in China were summarized,and also the advantages and disadvantages and the comprehensive efficiencies of the conventional spindle drills and the fully-hydraulic top-drive head drills were discussed.

The paper introduces the improvement on chuck of spindle drill to realize the inner assembly fishing without re- gressing the drill.

The paper introduces the developing status of core drilling machine both in China and abroad.

The description covers full-hydraulic core drilling machines,portable drills,geo-thermal drills,offshore and beach sampling equipment,all-casing drilling rig,etc.

Introduction is made on the development,technical parameters,main features,version verification test,production trial and appraisal of CD-2B alternating current and frequency conversion core drill.

This paper reviews the use, structure and capability of the core drill.

Introduction is made on the development, technical parameters, main features, version verification test, production trial and appraisal of CD - 3 core drill.