Drill rod forward and reverse rotation connecting device for underground coal mine drilling machine

Abstract

The invention discloses a drill rod forward and reverse rotation connecting device for an underground coal mine drilling machine. The drill rod forward and reverse rotation connecting device is composed of a first outer spline, a second outer spline, an inner spline sleeve and a spring straight pin. Involute outer splines (11 and 21) are arranged on the outer wall of the first outer spline (1) and the outer wall of the second outer spline (2) respectively, an involute inner spline (31) is machined in an inner cavity of the inner spline sleeve (3) in the axial direction in a full-length mode, and the involute outer splines of the first outer spline and the second outer spline are arranged inside the involute inner spline which is machined in the inner cavity of the inner spline sleeve in the axial direction in the full-length mode in a sleeved mode. One end of the first outer spline (1) is connected with a drilling rod, and the other end of the first outer spline (1) is provided with a circular cone male thread (12) which is in matched connection with a circular cone female thread (22) which is arranged on an inner cavity in one end of the second outer spline (2). The involute outer spline (11) of the first outer spline is provided with a spline axial positioning hole (13) in the radial direction, the spline axial positioning hole (13) corresponds to a spline axial positioning hole (32) formed in the inner spline sleeve in the radial direction, and the spring straight pin (4) is used for achieving fixed connection. The other end of the second outer spline is connected with the drill rod.

Description

technical field [0001] The invention relates to a forward and reverse connection device of a drill rod used for an underground drilling rig in a coal mine, and belongs to the technical field of drilling rig accessories. Background technique [0002] At present, the drill pipes used in small underground geological drilling rigs in coal mines are generally connected by female and male conical threads, and the tightening force of the threads is used to transmit the drilling torque and connect each section of the drill pipe. The outer wall of the drill pipe for drilling in the coal seam is usually provided with a positive spiral guide vane, which is forwardly screwed and discharged to the outside of the hole. Due to the connection properties of the thread, each section of the drill pipe connection can only be tightened in one direction, and the drilling rig can only be drilled in one direction. When drilling holes in gangue coal seams and softer coal seams, the phenomenon of br...

AI Technical Summary

Problems solved by technology

Once this phenomenon occurs, the drill bit or the drill pipe will be stuck, not only the drill hole cannot be drilled, but the drill pipe is also difficult to pull out from the drill hole.

If you want to reverse the drilling rig so that the drill pipe and drill bit can be buffered for processing, the female and male conical threads of the drill pipe will be withdrawn and disconnected from the connection inside the drill hole, resulting in hundreds of meters of drill pipe and drill bit. Discarding in the coal seam not only makes the drilled holes scrapped, but also loses a large amount of drill pipes and drill bits, ranging from tens of thousands of yuan to hundreds of thousands of yuan, which not only causes engineering losses and material losses, but also affects the progress of the project

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