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Connection for percussion drilling

A technology of connectors and couplings, which is applied in the direction of threaded connections, drill pipes, drill pipes, etc., and can solve problems such as not considering thread performance

Active Publication Date: 2021-01-26
SANDVIK MINING & CONSTR TOOLS AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The prior art often does not take into account the performance of the threads as they become worn

Method used

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  • Connection for percussion drilling
  • Connection for percussion drilling
  • Connection for percussion drilling

Examples

Experimental program
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Embodiment Construction

[0030] Figure 1A and Figure 1B Shown are a male coupling 1 and a female coupling 2 for a percussion drill string, each comprising wear resistant threads 1t, 2t, according to one embodiment of the present disclosure. A percussion drill string can be formed by screwing together multiple drill rods together with a percussion bit 3 at one end and a shank adapter (not shown) at the other end ( Figure 4 ). Drill pipes can be screwed together using male 1 and female 2 couplings. The drill string may be used for percussive rock drilling with a top hammer (not shown) or a down-the-hole hammer (not shown). If a down-the-hole hammer is used, the hammer may have wear resistant threads 1t, 2t each for assembly as part of a drill string.

[0031] The male coupling 1 may be attached, such as welded, to the intermediate rod body so as to form the longitudinal end of the drill rod. The female coupling 2 may be integrally formed with the hammer bit 3 . The male coupling 1 may have a tub...

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PUM

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Abstract

A connection for use in percussion drilling includes a male coupling and a female coupling. Each coupling includes a body and a respective screw thread formed on a respective inner or outer surface ofthe respective body. Each thread has a thread-form including a crest, a root, a contact flank and a non-contact flank. Each thread-form has a contact flank angle and a non-contact flank angle inclined relative to a respective baseline located at a respective minor or major diameter thereof. Each non-contact flank angle is greater than the respective contact flank angle. The crest of each thread-form is inclined from the respective contact flank to the respective non-contact flank such that an apex of the respective thread-form defining a respective minor or major diameter thereof is located adjacent to the respective non-contact flank.

Description

technical field [0001] The present disclosure generally relates to an abradable connector for use in percussion drilling. Background technique [0002] CN103015913 relates to the technical field of drill pipes, in particular to an exploration drill pipe thread structure with a super-large diameter of 12 and 3 / 4 inches. The thread structure of the exploration drill pipe includes external threads and internal threads, wherein the external threads are composed of external thread units, the internal threads are composed of internal thread units, the external thread units are composed of the first tooth base and the external thread teeth, and the internal thread units are composed of the second The bottom of the tooth and the internal thread are formed, the shapes of the external thread and the internal thread correspond to each other, and the external thread and the internal thread are abnormally asymmetrical. [0003] EP 0 009 398 / US 4,295,751 discloses a coupling thread struc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/042F16L15/06
CPCE21B17/042E21B17/0426F16L15/06E21B1/00
Inventor 约翰·哈马尔格伦安德烈亚斯·诺尔曼
Owner SANDVIK MINING & CONSTR TOOLS AB