In Huanghe Xiaolangdi water conservancy engineering,pneumatic downhole hammer and double driving head drilling machine were used to solve the problems coming up against with common pneumatic downhole hammer and conventional drilling technology while drilling in slag layer of 50m thickness.

The main method and content(1) This paper investigates the adaptability of full hydraulic top drive head rigs and spindle drilling rigs in deep mine prospectingDrilling rigs are key equipments in deep mine prospecting.

This paper introduces different mechanical rod break-out modes,their structures,characteristics and operating programs of top-drive power head drill.

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.