Before connecting the drill pipe with threaded connection, the male and female threads need to be cleaned to ensure that the male and female threads are free of loose cinders before thread butt joint. In the butt joint process, the male and female threads need to be screwed manually to ensure that the male and female threads are free of wrong buckle, and then they can be fixed with the cooperation of the holder slip and chuck slip of the drilling rig, Use the main shaft of the drilling rig to rotate and push slowly to realize the complete connection of male and female joints. When the drill pipe is installed and the thread is initially screwed manually, the thread connection is less or the thread is misaligned. At the same time, the main shaft of the drilling rig rotates and pushes forward, resulting in high temperature of thread matching, bluing, screwing, sliding, etc.

Similarly, when disassembling the drill pipe, if there is a pause and shaking of the drill spindle during the reversal process by relying on the drill spindle, the thread will be damaged. When the drilling rig is aged and the drill pipe clamped by the main shaft of the drilling rig is not concentric with the front gripper, loading and unloading the drill pipe will also cause thread sliding buckle, so the drilling rig needs to be maintained in time.