Rotary drilling rig drill pipe extends now basically delegated by hoist rope stretched out, lifting rope drill retracted. But also some of rotary drilling rig can either extend hoist can also be extended by gravity. It extended sequence: First Section, then the second section, and then the third quarter, the fourth quarter, then after V. Drilling process, it is by gravity, with a little bit extended drilling depth. Rotary drilling rig to improve in terms of versatility, but does not require complex modifications can be converted to another work unit is worth studying. Weight control sequence of each section of drill pipe. Extends: from coarse to fine. Retracted: from fine to coarse. Do not understand? Section I just drive power head drill pipe, drill pipe by following each section of drill pipe at the bottom of the drive units to drive the German deep drilling Xinghua Machinery Co., Ltd. is specialized in the production of rotary drilling drill, auger drill, mention cited the enterprise, honesty is the company's purpose endless pursuit of excellence is the goal. dedication to customer service is the company's consistent policy. Only by creating value for customers. in order to create value for themselves.