Self-locking drill rod capable of rotating forwards and backwards

Abstract

The invention discloses a self-locking drill rod capable of rotating forwards and backwards. The drill rod comprises a rod body, a male connector, a female connector, a mandrel and a sliding sleeve, wherein the mandrel is sleeved in the rod body and has driving force for sliding backwards in the axial direction, the sliding sleeve is slidably arranged outside the male connector in an axial sealingand sleeving mode and is in transmission fit with the male connector, meshing teeth are arranged at the front end of a sliding sleeve and the rear end of the female connector, and when a male connector of a rear drill rod is in threaded connection with a female connector of a middle drill rod, the male connector of the rear drill rod axially pushes a mandrel in the middle drill rod to axially slide forwards together with a sliding sleeve, so that the sliding sleeve of the middle drill rod is meshed with the meshing teeth of a female connector of the front drill rod. According to the self-locking drill rod capable of rotating forwards and backwards, by means of the matching relation between the adjacent drill rods, automatic locking during upward drilling and automatic unlocking during downward drilling can be achieved, forward and reverse alternate rotation and reciprocating hole sweeping can be achieved so as to enhance deslagging, jam releasing and pressure relieving, and thereforedrill jamming and drill holding are avoided; and the link of manual auxiliary disassembling and assembling is omitted, so that mechanical automatic drill rod assembling and disassembling are achieved,and the automatic construction efficiency of a drilling machine can be greatly improved.

Description

technical field [0001] The invention relates to the technical field of mining machinery, in particular to a self-locking drill pipe with forward and reverse rotation. Background technique [0002] Gas disaster is one of the main disasters that affect the safe production of coal mines. At present, the main technical means to control gas disasters is to use drilling rigs to construct gas drainage boreholes. As a supporting tool for drilling rigs, drill pipe is an important factor directly related to hole quality, construction efficiency and pumping effect. [0003] In the current drainage hole drilling operation, the conical thread connection is generally adopted between the front and rear two drill rods. Therefore, during the drilling construction process, the drill rod can only rotate in the forward direction. Affected by complex geological conditions, accidents such as drill sticking and sticking are very likely to occur in case of hole collapse and poor slag discharge. ...

AI Technical Summary

Problems solved by technology

Although the above connection method can realize the forward and reverse bidirectional rotation of the drill pipe, the loading and unloading process is cumbersome and the structure is complicated. When the drill pipe is docked, the pins need to be manually installed or removed, and it is difficult to realize the loading and unloading in an automated way, which seriously reduces the automatic construction efficiency of the drilling rig.

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