HJG-B series open-air blast hole drilling rig is a combustion engine driven crawler-type hydraulic drilling rig developed by our company, adopting self-propelled hydraulic track chassis with favorable mobility and equipped with high-power hydraulic motor, heavy hydraulic drill boom and high air pressure DTH Hammer. The use of drilling rig HJG-B140 mainly covers strip mining, road construction and rock-drilling process in the field of water-power engineering. It is a down-the-hole drilling rig specially designed for open mine, stone pit and construction industry.