The down the hole drilling rig is an impact rotary drilling rig, which has the advantages of meeting the needs of drought resistant irrigation water with minimal power and cost. It is currently one of the most advanced and fast mechanized drilling equipment, and has been successfully sold both domestically and internationally, winning high praise from a large number of users Its internal structure is different from that of a general rock drill, and its air distribution and piston reciprocating mechanism are independent, namely the impactor Its front end is directly connected to the drill bit, and its rear end is connected to the drill rod This product (LQ-200 crawler drilling machine) has a maximum drilling depth of 1000m-2000m, a maximum drilling diameter of 235mm, a drill rod length of 2000mm-3000mm, a maximum power head stroke of 2800mm-3700mm, a drill rod diameter of 89mm, a lifting force of 15T, a turning torque of 5500NM, a bearing method of hydraulic crawler, a walking speed of 2500km/h, a climbing ability of 25 °, an external size of 2600mm * 1300mm * 2050mm, and a total weight of 4600kg