new drill steel material, one step method quality tungsten carbide, PDC drill steels and DZ series of all hydraulic rock drilling equipment, to build China into a country powerful in rock drilling equipment" is initiated.

Application and practice of drilling equipment of Chengchao iron mine;

The development history of drilling equipment of underground mine;

The working fluid choice and pollution control for the hydraulic rock drill;

Calculation of movement journey of flow valve in hydraulic rock drill;

Improving material properties and evaluating design quality of hydraulic rock drill's piston;

On the basis of a hydraulic drill impact principle, a drive s calculating method was established that of hydraulic drill, an electro- hydraulic principle was analged that of hydraulic drill with drive system.

This paper specifies the development history of underground chisel rock equipment and its application and development trend.

Application of medium-length hole drilling equipment in non-ferrous mines in China;