Wet cutting head or cutting drum assembly with detachable tooth seats

Abstract

The invention provides a wet cutting head or cutting drum assembly with detachable tooth seats, and belongs to the technical field of coal mine mining mechanical cutting device accessories. The wet cutting head or cutting drum assembly comprises conical cutting teeth, conical tooth tooth seats, dust falling connecting seats, fixing blocks and a cutting head or cutting drum, wherein each conical cutting tooth comprises a tooth shank, a tooth shoulder, a toothed rod, and a conical part; both the tooth shanks and the tooth rods are cylindrical structures; the tooth shoulders are of circular truncated cone structures, the bottom surfaces of the tooth shoulders are connected with the tooth shanks, and the top surfaces of the tooth shoulders are connected with the tooth rods through annular transition curved surfaces; the conical parts are located on the tooth rods, hard alloys are brazed to the tops of the conical parts, and a plurality of oval bending resistant beams are uniformly arrangedon the circumferential surfaces of the conical parts; mounting holes are formed in the conical tooth tooth seats, and quick inserting tenons are arranged on the lower parts of the conical tooth toothseats; inserting grooves are formed in the dust falling connecting seats, water distribution interfaces are formed in the bottom surfaces of the dust falling connecting seats, dust falling nozzles are arranged at the rear parts of the dust falling connecting seats, and internally-arranged water routes are arranged inside the dust falling connecting seats; and the fixing blocks are used for closing inserting inlets of the inserting grooves. The wet cutting head or cutting drum assembly can increase the bending resistance of the cutting teeth, and achieves the detachable connection between thetooth seats and the cutting head or the cutting drum.

Description

technical field [0001] The invention belongs to the technical field of coal mining machinery cutting device accessories, and specifically discloses a wet cutting head or a cutting drum assembly with a detachable tooth seat. Background technique [0002] The cutting head is a cutting device widely used in coal mine excavation equipment. It is mainly composed of a cutting head body with a welded structure, a tooth holder welded on the cutting head body, and a pick inserted into the mounting hole of the tooth holder. During rock excavation after coal mining, it is usually accompanied by obvious wear of picks and tooth holders. When wear occurs on the pick, the pick can be taken out from the mounting hole of the tooth seat and replaced with a new pick. Yet when tooth seat wears and teares, because tooth seat and cutting head or cutting drum body are welded as a whole, therefore can't carry out the replacement of tooth seat, this moment cutting head or cutting drum have to carry...

AI Technical Summary

Problems solved by technology

Some existing picks prolong the service life of the pick by reducing the angle of the tapered part and coating the wear-resistant material, but this method is actually to make the pick into a composite structure of two materials. The bending resistance of the gear rod is greatly weakened, which affects the actual service life of the pick

Due to the complex geological conditions of coal mines, some coals and rocks have high hardness and certain abrasiveness, when the contact force between the pick shank and the mounting hole of the tooth seat becomes larger and exceeds the critical friction between the two , the rotational freedom of the pick in the installation hole is limited, the pick cannot rotate during the process of contact with the coal mass and rock mass, and a certain area of ​​the pick tooth bar in the circumferential direction will always be in contact with the coal mass or rock mass. body contact, the metal material in this area wears out sharply, resulting in eccentric wear of the pick

The strength of the pick with eccentric wear will be further weakened, resulting in the overall bending failure of the pick

In addition, in order to reduce the resistance of the pick cutting into the coal or rock mass, the taper of the front end of the pick shank is usually small, so that the pick is easy to cut into the coal or rock mass, but the tooth shank pair with a smaller taper is installed on the top of the pick The wrapping performance of the cemented carbide deteriorates. After a certain amount of wear occurs to the metal material in the circumferential direction of the pick rack, the cemented carbide is easy to fall off, resulting in the pick not being able to effectively break the rock.

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