Three-wing coreless alloy drill

Abstract

The invention relates to the technical field of drill bits, in particular to a three-wing coreless alloy drill bit, which comprises a tool bit, a drill bit body and a connecting part, the tool bit isfixedly connected with one end of the drill bit body, the connecting part comprises a connecting shaft, a sleeve, an annular end cover and a long rod bolt, wherein a plurality of rings of alloy wire are wound on the outer side of the connecting shaft; the sleeve and the connecting shaft are coaxially arranged; the inner diameter of the sleeve is equal to the sum of the diameter of the connecting shaft and the thickness of the alloy wire; a limiting groove is formed in the tail part of the connecting shaft; a plurality of bolt connecting holes are formed in the limiting groove; a limiting bossand a plurality of bolt limiting holes are formed on the annular end cover; the limiting boss is positioned in the limiting groove; the number of the bolt connecting holes and the number of the bolt limiting holes is equal; the positions of bolt connecting holes correspond to the positions of the bolt limiting holes. The annular end cover and the connecting shaft are fixedly connected through a long rod bolt. The drill bit is simple in structure and reasonable in design, forming a plurality of small blocks after the connecting shaft is cracked is avoided, and the drill bit with a cracked connecting shaft is convenient to take out.

Description

technical field [0001] The invention relates to the technical field of drill bits, in particular to a three-wing coreless alloy drill bit. Background technique [0002] In the coal mining industry, the drill bit is the main part of the drilling equipment, and its main function is to break the rock and form the hole. The rotary drill bit is currently commonly used in the coal mining industry. Driven by machinery, the rotary drill bit will rotate, thereby driving the entire drill bit to produce a centripetal movement, and through cutting and grinding, the rock will be cracked and broken by oil drilling marks. The effect of drilling down. [0003] The three-wing coreless alloy drill bit is the main force of coal mining drilling equipment. However, the connection between the traditional drill bit and the drill pipe often breaks. This is because the connection between the drill bit and the drill pipe is provided with a threaded connection groove. The thickness of the outer wall...

AI Technical Summary

Problems solved by technology

[0003] The three-wing coreless alloy drill bit is the main force of coal mining drilling equipment. However, the connection between the traditional drill bit and the drill pipe often breaks. The thickness of the outer wall is relatively thinner than that of the drill bit as a whole, and it is easy to split into two or more lobes under long-term drilling and impact

Broken drill bits will remain in the drill hole and are not easy to remove, making it difficult to drill with new drill bits and shortening the service life of new drill bits

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