Forward and reverse rotation drill rod

Abstract

The invention relates to a forward and reverse rotation drill rod, and belongs to the technical field of drilling tools. The drill rod comprises a drill rod body with a center hole, one end of the drill rod body is a male head and is sleeved with a reverse thread sleeve in sliding connection with the drill rod body, and the side, close to the male head, of the reverse thread sleeve is provided with an inner reverse thread with the rotation direction opposite to that of a male head thread and a female head thread of the drill rod. The inner reverse thread is matched with an outer reverse thread arranged at the other end of the drill rod, the reverse thread sleeve can be connected with the outer reverse thread located on the other drill rod through the inner reverse thread under the action of external force, and rotation of the reverse thread sleeve is limited through a pushing mechanism arranged on the drill rod body; and the drill rod body is further provided with a limiting sleeve for preventing the reverse thread sleeve from slipping from the male head end, and the limiting sleeve is in threaded connection with the drill rod body. By arranging the reverse thread sleeve with the thread rotating direction opposite to the rotating direction of the drill rod, drill falling during reverse rotation of the drill rod can be prevented, the connecting strength of the drill rod is improved, machining and manufacturing are easy, and the production and manufacturing cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of drilling tools and relates to a forward and reverse drill pipe. Background technique [0002] At present, the drill rods used in the coal seam drilling operation in underground coal mines are generally connected by conical threads and can only rotate in one direction. When the hole collapses and the drill occurs in the drilling construction project, frequent forward and reverse rotations are required for buffering, loosening and unclamping. However, when the drill pipes connected by ordinary threads are reversed, the drill pipe will be tripped and a drill drop accident will occur. [0003] In recent years, some drilling rods that can run forward and reverse have been developed to solve the drilling construction problems. There are mainly the following types: (1) Plug-in drill rods, which use the plug-in mating surface to transmit torque, and use key pins or screws to transmit torque. Axial positioning co...

AI Technical Summary

Problems solved by technology

[0004] The existing drill pipes mainly have the following defects: (1) the plug-in connection has a large gap and the transmission torque is small; (2) in the spline sleeve drill pipe, after the thread is screwed, it is difficult to control the spline phase accuracy of the adjacent drill pipe, Thread processing errors and wear will seriously affect the connection of the drill pipe; (3) The strength of the floating clamping element of the floating axial limit drill pipe is weak, especially the torsional strength is poor, and the flushing fluid will also seriously affect the stability of the connection

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