The rotary drilling rig is suitable for the construction machinery of pile driving in foundation engineering. The drilling diameter is 450-1600 mm, and the drilling depth is up to 20 meters. It is mainly used for drilling in sand, clay, silty clay, etc. it is widely used in cast-in-place pile, drawing wall, foundation reinforcement and other foundation projects. It can meet the construction requirements of various basic engineering projects. Generally, hydraulic crawler chassis, automatic lifting box mast, telescopic drill pipe, automatic vertical regulator, depth indicator, etc.