Buffered weldless pick-shaped cutter for coal mining machine

Abstract

The invention relates to a buffered weldless pick-shaped cutter for a coal mining machine. The buffered weldless pick-shaped cutter is composed of a cutter body and is characterized in that the center of the front end of the cutter body is provided with a blind hole in which a protective cover is arranged; the corresponding parts of the outer circle of the protective cover and the inner circle of the blind hole are respectively provided with an annular groove, and the annular grooves are internally provided with elastic check rings; a spring, a cushion block and a carbide bit are sequentially arranged from the inner end to the outer end of the protective cover, and the outer end of the carbide bit is approximately tapered and extends out of the outer end of the protective cover; the outer sections of a carbide bit section in the protective cover and a protective cover section corresponding to the carbide bit section are both a tapered section which is large inside and small outside; the outer side of the outer end of the protective cover is tapered, the outwards extending end of the protective cover extends out of the blind hole, and the taper of the outwards extending end of the protective cover is matched with the taper of the outwards extending end of the carbide bit. The pick-shaped cutter has the advantages that the cutter body and the carbide bit cannot fall off, and the pick-shaped cutter is long in working life. The pick-shaped cutter is suitable for the coal mining machine for a coal mine.

Description

technical field [0001] The invention relates to a coal mine machinery accessory. Specifically, it is a non-welding pick pick with buffer function on the shearer. Background technique [0002] At present, most of the pick picks used on the shearer are made of a tooth body made of common steel and a cemented carbide cutter head welded on the front end of the tooth body. The failure form of this pick pick is mainly the separation between the tooth body and the hard alloy cutter head at the front end and falling off. Among them, the main reasons for the separation and shedding phenomenon are as follows: one is caused by the poor wear resistance of the welding part; the other is caused by the difference in thermal expansion coefficient between the welding material and the tooth body and the cemented carbide cutter head material; The third is due to the low mechanical strength of the welding part, which is not enough to resist the stress of work and cause fatigue. Therefore, th...

AI Technical Summary

Problems solved by technology

Among them, the main reasons for the separation and shedding phenomenon are as follows: one is caused by the poor wear resistance of the welding part; the other is caused by the difference in thermal expansion coefficient between the welding material and the tooth body and the cemented carbide cutter head material; The third is due to the low mechanical strength of the welding part, which is not enough to resist the stress of work and cause fatigue.

Therefore, it is easy to fall off between the tooth body of the above-mentioned pick pick and the hard alloy cutter head at its front end, and the working life is short

Images