Working principle of drilling rig

The lifting ring and the lifting ring seat are connected by a pin shaft, and the lifting ring seat is welded to the hook rod as a whole. The cylinder body is connected to the hook body with a left-hand thread, and a stop block is used to prevent the thread from loosening. The hook body and cylinder body can move up and down along the hook rod. The function of the internal and external load springs is to enable the vertical root to loosen and bounce upwards during drilling.
The cylinder is filled with engine oil. The seat ring of the thrust bearing divides the oil chamber into two parts, and there are oil holes on the seat ring. Due to the damping effect of oil flow, it absorbs the impact vibration of the hook body during drilling operations, which can prevent damage to the threads of the drill pipe joints.
The upper end of the cylinder is composed of 6 small springs and a positioning plate to form a positioning device. With the help of the friction force between the positioning and the circular contact surface of the lifting ring seat, it can prevent the lifting ring from turning when lifting the empty elevator.