High load drill stem and raise boring machine with the same

Abstract

The invention discloses a high load drill stem which is used in a boring machine and particularly applicable to a raise boring machine. The high load drill stem comprises a hollow drill stem body. Two ends of the hollow body are respectively provided with a male joint and a female joint which are matched with each other. The male joint and the female joint are respectively in a hollow structure. An outer side wall of the male joint is provided with outer taper threads extending along the axial direction. An inner side wall of the female joint is provided with inner taper threads extending along the axial direction. A thread angle of the outer taper threads and the inner taper threads is 60 degrees and conic degree is 1:7 to 1:12. The outer taper threads are provided with a loading flank angle alpha 1 and an inner buckling flank angle beta 1. The inner taper threads are provided with a loading flank angle alpha 2 and an inner buckling flank angle beta 2 and corresponding to the outer taper threads. 10 degrees <=alpha 1=alpha 2<=20 degrees, 40 degrees <= beta 1=beta 2<=50 degrees, and alpha 1+beta 1=alpha 2+beta 2=60 degrees. The high load drill stem can bear large axial tension and torque and suitable for the large raise boring machine.

Description

Technical field [0001] The invention relates to the field of mining machinery, in particular to a high-load drill pipe. The invention also relates to a raise drilling rig. Background technique [0002] As an important construction machine in mining machinery, the raise rig is widely used in the construction of wellbore with lower transportation roadways and stable geological conditions. It is mainly driven by the motor of the drilling rig to drive the oil pump to drive the hydraulic motor, and use hydraulic power to reduce the torque It is transmitted to the drilling tool system to drive the drill pipe and the drill bit to rotate. The hob on the pilot drill bit or the reaming bit performs pure rolling or slight displacement along the rock working surface of the bottom hole under the action of the drilling pressure; at the same time, the shaft produced by the main engine cylinder The pull and pressure also act on the pilot hole drill or reaming bit through the power head and the d...

AI Technical Summary

Problems solved by technology

[0003] At present, the joint thread of the drill pipe of the raise drilling rig in the world mostly adopts the tapered joint thread connection method of the American Petroleum Institute (API) standard. This thread is a regular buckle-cone triangular thread form, and its tooth angle is 60°, and the taper is 1. :6, the thread pitch is 6.35mm. This joint thread is designed for oil drilling. Its main feature is that it is convenient to manufacture, but its torsion resistance is small. Under the condition of axial tension and torque, it often causes tooth surface deformation and overall fracture, which has become a bottleneck restricting the development of raise drilling rigs in the direction of high torque and large well depth

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