Backpitch shattering and dust collecting drill bit

Abstract

The invention discloses a backpitch shattering and dust collecting drill bit which comprises a connecting rod and more than three backpitch cutter wings evenly arranged. Blades are arranged on the ridge portions of the backpitch cutter wings respectively, the rear ends of the backpitch cutter wings are all connected to the front end of the connecting rod, the diameter of the rear portion of the connecting rod is smaller than that of the body of the connecting rod, a connecting portion used for connecting a drill pipe is formed, and connecting threads are arranged on the circumferential surface of the connecting portion. An axial air channel penetrating through the connecting rod in a front-and-back mode is formed in the connecting rod, and horn mouths are arranged at the front end and the rear end of the axial air channel respectively. The backpitch shattering and dust collecting drill bit can achieve efficient crushing of coal rock, the coal rock is cut down from a coal wall, is further shattered to be fine pulverized coal convenient for air to convey, and is conveyed out through the air channel, the efficient air conveying of the pulverized coal is achieved, and therefore the channel is not prone to being blocked, pore-forming speed and pore-forming quality are improved, and maintenance cost, labor cost and time cost in a drilling operation are reduced.

Description

technical field [0001] The invention relates to a drill bit used in a gas drainage drilling system for soft and outburst coal seams in coal mines, in particular to a deep hole drilling system for coal dust and gas emission pollution-free deep hole drilling and slag removal in soft and outburst coal seams in coal mines. The drill used. Background technique [0002] In soft and protruding coal seams in coal mines, conventional drilling devices and methods are easy to cause hole collapse, hole blocking, injection holes, top drilling, and blockage of the filter element in the drill bit cavity during the operation process. Wind slag discharge during drilling will also cause Gas and coal dust explosion hazards in the working environment of the working face. In short, conventional operating devices (including drill bits) are prone to accidents during use, have low work efficiency and bring danger to operators. Contents of the invention [0003] The object of the present inventi...

AI Technical Summary

Problems solved by technology

[0002] In soft and protruding coal seams in coal mines, conventional drilling devices and methods are easy to cause hole collapse, hole blocking, injection holes, top drilling, and blockage of the filter element in the drill bit cavity during the operation process. Wind slag discharge during drilling will also cause Gas and Coal Dust Explosion Hazards in Working Environment of Working Face

In short, conventional operating devices (including drill bits) are prone to accidents during use, have low work efficiency and will bring danger to operators

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