Drill bit for coal mine gas drainage hole

Abstract

The invention relates to a special drill bit for gas drainage hole drilling, in particular to a coal mine gas drainage hole drill bit. The present invention is achieved in this way, a coal mine gas drainage hole drill bit, the drill bit is axially provided with a through hole, the top of the through hole is provided with a grate frame, the grate frame is provided with a grate, and the contact part between the grate frame and the grate is in the shape of a bell mouth , The grate is matched with the grate frame, the cutter head is arranged on the grate, and the periphery of the grate is fixed in the grate frame by touch beads. The invention has the advantage that by changing the structure of the parts, the coal nodules can be discharged directly during the working process without affecting the work of the workpiece.

Description

technical field [0001] The invention relates to a special drill bit for gas drainage hole drilling, in particular to a coal mine gas drainage hole drill bit. Background technique [0002] Underground gas drainage in coal mines is mainly realized by drilling. With the popularization of triangular drill pipes, the drilling is getting deeper and deeper, generally reaching about 100 meters. Such deep holes are prone to collapse, and the drill bit and drill pipe are pulled out. Finally, the collapsed hole is easy to block the gas drainage hole, so that the gas drainage pipe cannot go deep into the bottom of the gas drainage hole, and the gas cannot be effectively extracted. [0003] The application number is 200810017598.x, and the invention name is the application for the invention of the inner core detachable drill bit for drilling, which discloses a detachable drill bit. Since the drill bit is not designed for coal mine outburst prevention, the drill bit is used for coal mine ...

AI Technical Summary

Problems solved by technology

[0005] The present invention is an improvement on the basis of the application number "201120477960.9" and the name "Coal Mine Gas Drainage Hole Drill Bit", which solves the problem of pulverized coal clogging between the perimeter of the grate and the grate frame, making it difficult for the grate to come out and the grate being abnormal during the drilling process. For the problem that normal prolapse cannot be reset, a coal mine gas drainage drill bit is provided, which can effectively discharge the coal powder between the grate and the grate frame, and a coal mine gas drainage that can be automatically reset when the grate is abnormally protruded during the drilling process hole drill

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