Dry cutting head or cutting roller assembly with detachable tooth holder

Abstract

The invention provides a dry cutting head or cutting roller assembly with a detachable tooth holder, and belongs to the technical field of accessories of cutting devices of coal mining machinery. Thedry cutting head or cutting roller assembly comprises a conical cutting tooth, the conical tooth holder, a connecting seat, a fixing block and a cutting head or cutting roller; the conical cutting tooth comprises a tooth handle, a tooth shoulder, a tooth rod and a conical part, the tooth handle and the tooth rod are each of a cylindrical structure, the tooth shoulder is of a circular truncated cone structure, the bottom surface of the tooth shoulder is connected with the tooth handle, and the top surface of the tooth shoulder is connected with the tooth rod through an annular transition curvedsurface; the conical part is positioned on the tooth rod, a hard alloy is brazed at the top, and a plurality of oval anti-bending beams are uniformly arranged on the circumferential surface; a mounting hole is formed in the conical tooth holder, and a quick insertion tenon is arranged at the lower part; the connecting base is welded to the cutting head or the cutting roller and provided with an inserting groove matched with the quick insertion tenon; and the fixing block is used for sealing the insertion opening of the inserting groove. According to the dry cutting head or cutting roller assembly with the detachable tooth holder, the bending resistance of the cutting tooth can be improved, and meanwhile, the tooth holder is detachably connected with the cutting head or the cutting roller.

Description

technical field [0001] The invention belongs to the technical field of coal mining machinery cutting device accessories, and specifically discloses a dry 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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