Down-the-hole drilling rig drill pipe coupling

Abstract

The invention discloses a drill rod coupler for a down-the-hole drill. The drill rod coupler comprises an upper body and a lower body which are respectively provided with a vent hole, a groove is arranged at the lower end of the upper body, a bump used for extending into the groove and then transferring the torque is arranged at the upper end of the lower body, a gap is left between the groove and the bump, and a centering airtight structure is arranged between the upper body and the lower body. The gap between the groove and the bump can be used for avoiding the bending of a drill rod in disturbance and reducing the fatigue breakage probability of the drill rod; compared with the prior art, after the coupler is adopted, the cheap drill rod can achieve the obvious effect of the expensive drill rod in the prior art, thus greatly lowering the construction cost; the centering airtight structure can play a role in transferring axial thrust when the drill rod is in drilling, and a role of air sealing under any circumstance, so that the sealing property of a chip removal air channel can be ensured, and high-pressure air can be used for dredging the blocking easily only by slightly lifting up the drill rod when the channel is blocked, so that the drill rod coupler is convenient and efficient to use.

Description

technical field [0001] The invention relates to the field of engineering rock drilling machinery, in particular to a component of a drilling rig. Background technique [0002] Drilling rig is a kind of engineering machinery used for rock drilling operations. It is often used in blasting drilling operations and geological drilling operations. After the large drilling rig is mounted on the arm of the excavator, it has the advantages of flexible transfer, convenient use, and high drilling efficiency. Effectively improve the operation efficiency of engineering construction, it has gradually become the mainstream equipment of engineering drilling rigs. [0003] The drill rod of the drilling rig needs to perform rotary motion and axial feed motion at the same time during drilling. The drill rod is driven to rotate by the motor and the tooth box. The tooth box is fixed on the carriage that can move along the drilling direction. The middle part of the drill pipe is fed with high-pr...

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a drill rod coupling for down-the-hole drilling rigs. The coupling adopts a spherical centering sealing structure, which can not only adapt to the disturbed working conditions of the drill rod, but also meet the requirements of ventilation and air tightness, and can effectively Solve the technical problems of high requirements on drill pipe and poor air tightness in the existing drill pipe connection structure

Images