Kelly bar is one of the important working parts of the drilling rig. It is an important part of the rotary drilling rig to transmit torque and pressure to the drill bucket. While the drill pipe is rotating, the cutting force of the bucket teeth is used to realize the drilling of the drill. The feed motion of the hole work; or when drilling a rock block greater than 10Mpa, the power head is driven by the pressurized oil cylinder to pressurize, and the axial force is transmitted to the drill bucket through the drill rod through the inner key of the sleeve spindle to realize the drilling rig Feed movement for drilling work.
The drill rod is a telescopic tie rod type, and the inner wall and outer wall of each drill rod are evenly distributed in the circumferential direction with three sets of inner and outer keys (the inner drill rod has only outer keys). The outer key is the same length as the drill rod, and the inner key is only distributed within a length of about one meter at the lower end of the drill rod, and its function is to transmit torque and axial pressure between each other. When drilling, it extends from outside to inside in sequence; when lifting the drill, it retracts in sequence from inside to outside to complete one cycle of drilling operations.
The lower end of the drill rod is equipped with a shock-absorbing spring, and the upper end of the outer layer is connected with the follower frame through a slewing support. The lower end of the inner drill rod is supported by the damping springs on the outer sections of the drill rod. The upper end of the innermost section of drill pipe is connected by Hairun Tinqi to the main hoisting wire rope, and the Hairun Tinqi realizes lifting and lowering.
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