Direct-connection type cross-section-variable high-low tooth rope coring drill rod

Abstract

The invention provides a direct-connection type cross-section-variable high-low tooth rope coring drill rod. The drill rod comprises a drill rod body. One end of the drill rod body is provided with an external tapered screw buckle, the other end of the drill rod body is provided with an internal tapered screw buckle, and the portion, between the internal tapered screw buckle and the external tapered screw buckle, of the drill rod body is set as a smooth rod segment of the drill rod body. The internal tapered screw buckle comprises a trapezoidal thread low-tooth segment I and a trapezoidal thread high-tooth segment I. The external tapered screw buckle comprises a trapezoidal thread high-tooth segment II close to the end of the drill rod body and matched with the trapezoidal thread high-tooth segment I and a trapezoidal thread low-tooth segment II arranged at the root portion and matched with the trapezoidal thread low-tooth segment I. The tooth top of the external tapered screw buckle is tightly matched with the tooth bottom of the internal tapered screw buckle in a contact mode. The tooth bottom of the external tapered screw buckle is in clearance fit with the tooth top of the internal tapered screw buckle. The drill rod is lower in cost consumption, better in economical performance and wider in application prospect, and the bearing capacity of the drill rod can be improved greatly under the condition that raw material consumption is not changed, and the drill rod can be used for drilling deeper holes based on the original foundation.

Description

Technical field [0001] The invention relates to a geological prospecting equipment, in particular to a directly connected variable cross-section high and low rope coring drill rod. Background technique [0002] Rope core drilling technology has been in practice in my country for more than 30 years. Because of its high drilling efficiency, high core rate, and low labor intensity, it has become the main method of prospecting in my country. As a high-cost and high-consumption drilling tool, core drill pipe has always been the focus of many domestic drilling tool manufacturers and drilling construction units. A large number of accidents in the hole have proved that more than 90% of the hole bottom accidents occur at the connection part of the drill pipe male and female screw, especially the fracture of the root of the male and female screw accounts for the vast majority. The main reason is that the local weakness and Caused by stress concentration. Analyze the causes of the above ...

AI Technical Summary

Problems solved by technology

Analyzing the causes of the above accidents, due to the complex force of the drill pipe in the hole, it needs to bear the effects of tension, compression, torsion, bending stress and impact load at the same time, and the existing drilling tool manufacturing does not directly consider the inner and outer diameters of the drill pipe itself Deviation and wall thickness deviation, resulting in uneven wall thickness of the screw at the end of the drill pipe, limited usable depth, and weak parts are easy to bury hidden dangers for accidents in the hole due to stress concentration during actual use

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