The CMJ2 series hydraulic drilling rig is mainly used for underground excavation in drifts, tunnels of coal mines and other underground engineering. It is a double-boom drilling machine that can be either single-powered or dual-powered. A hydraulic rock drilling system combined with an anti-jamming device is used to work on rock at an ultra-high speed. This flexible drilling mechanism can not only perform drilling on the roofs, side walls and the faces of the drifts, but it is also a good choice for creating anchor holes.