Working principle of rotary drilling rig

Drilling with a rotary drilling rig is a process in which the expandable drill rod and the drill bit at the bottom of the drill rod are rotated by a turntable or power head under the condition of mud protection. The cutting tools on the bottom and side openings of the drill bucket are used to cut the rock and soil, and the cut rock and soil enter the drill bucket from the opening. After the drilling bucket is filled, the drill bit is lifted up to the hole opening through the telescopic drill rod, and the bottom is automatically opened to discharge slag. Then, the drilling bucket is lowered to the bottom of the hole to continue drilling, and this process is repeated until the designed hole depth is reached.