Drill bit of drilling type coal mining machine

Abstract

The invention discloses a drill bit of a drilling type coal mining machine. The drill bit comprises a drill bit body and a spiral drill rod, wherein the spiral drill rod comprises a center rod, spiral blades and a concave connector; the drill bit body comprises an end plate, scrapers, hobs, conical bits and a cross cutter; and the scrapers and the hobs are arranged on the end plate. Compared with the prior art, the drill bit body of the drill bit is uniformly stressed, so that the service life of the drill bit is prolonged, the drill bit is prevented from unbalance loading caused by the structural style, and the generation of deviation drilling is reduced; the lumpiness of broken coal rocks is larger, so that the conveying capacity of the spiral blades is improved; and the structure has strong rock breaking capacity, high cutting efficiency, high lump coal rate, good coal loading effect, and wide practicability.

Description

technical field [0001] The invention relates to a coal shearer drill bit, in particular to a drilling type coal shearer drill bit. Background technique [0002] Shearer is widely used in thin and extremely thin coal seam mining, such as figure 1 and figure 2 As shown, the drill bits used are generally helical drill bits, which are mainly composed of ribs, helical blades, hubs, end discs, picks and tooth seats. The ribs, hubs and end discs are welded together to form drill bits and tooth seats It is welded on the end plate and the rib plate, the tooth seat on the rib plate is generally arranged along the helix, and the picks are installed in the tooth seat. Due to the arrangement of the picks adopted by this kind of drill bit, the force on the drill bit is uneven during the mining process. , The occurrence of eccentric load increases the deflection of the drill pipe, which is not conducive to mining and withdrawing the pipe. In addition, because ordinary drills are comple...

AI Technical Summary

Problems solved by technology

[0002] Shearer is widely used in thin and extremely thin coal seam mining, such as figure 1 and figure 2 As shown, the drill bits used are generally helical drill bits, which are mainly composed of ribs, helical blades, hubs, end discs, picks and tooth seats. The ribs, hubs and end discs are welded together to form drill bits and tooth seats It is welded on the end plate and the rib plate, the tooth seat on the rib plate is generally arranged along the helix, and the pick is installed in the tooth seat. Due to the arrangement of the pick used by this kind of drill bit, the force on the drill bit is uneven during the mining process. , the occurrence of eccentric loads increases the deflection of the drill pipe, which is not conducive to mining and withdrawing the pipe

In addition, because ordinary drills are completely cut with pick picks, the cutting area is concentrated and the cutting size is small, which is not conducive to transportation.

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