This drilling rig is mainly used in the soft and broken coal seam of underground coal mine, which could effectively solve the problems of hole forming and protection;

The drilling rig is provided with an automatic drill rod loading device. In the drilling process, the casing will remain stationary while the drill rod runs (water is supplied into the center of the drill rod and the space between the drill rod and the casing); when reaching the design hole depth, the drill rod will be withdrawn while the protective casing will be remained in the hole; the casing will be withdrawn after the antipriming pipe is run into the entire hole section. The antipriming pipe is run into the entire hole section of long directional hole, which ensures the hole forming of long directional hole and improves the gas extraction rate of the hole.