Integrated silicon nitride full-ceramic high-precision classifying wheel

Abstract

The invention discloses an integrated silicon nitride full-ceramic high-precision classifying wheel. The classifying wheel is of an integrated totally-closed cylindrical barrel-shaped structure and ismade of a silicon nitride ceramic material. A motor spindle hole is machined in the end face of one side of the classifying wheel, and a spindle fixing groove is machined in the motor spindle hole. Multiple movable balance holes are evenly distributed in the portion, around the motor spindle hole, of the end face of the classifying wheel annularly. A feed port is formed in the end face of the other side of the classifying wheel. 50 classifying discharge ports are evenly distributed and machined in the outer surface of the classifying wheel with the motor spindle hole as the center. The integrated silicon nitride full-ceramic high-precision classifying wheel has the beneficial effects of being high in hardness, free of reacting with powder, high in classifying fineness and the like.

Description

technical field [0001] The invention relates to the field of material processing, in particular to a ceramic classifying wheel. Background technique [0002] Superfine grinding and classification is a kind of equipment for the field of nano-material processing. It can effectively improve the particle size distribution of materials. At present, it is widely used for re-crushing and coarse-fine separation of nano-materials. In the classification area, the high-speed rotating classifying wheel generates a strong centrifugal field, and the particles are affected by the centrifugal inertial force and the centripetal force generated by the viscosity of the airflow in the centrifugal field. Its working principle is: the compressed air is sprayed into the crushing chamber through the nozzle at high speed, and the materials are repeatedly collided, rubbed, sheared and crushed at the intersection of multiple high-pressure airflows. The ascending air flow moves to the classifying area...

AI Technical Summary

Problems solved by technology

[0003] However, the classification wheel in the prior art has the disadvantages of large size and wide classification accuracy. During the classification process, large particles of materials often fall into the device, and it is not easy to clean. Dust will affect the normal use of the classifying wheel to a certain extent and reduce the efficiency of the classifying wheel; secondly, when the cantilever shaft classifying wheel in the prior art rotates at high speed, due to the unbalanced force on the front and rear impeller discs, the front and rear impellers The disk will be twisted, which will lead to the deformation of the blades of the classifying wheel, which has the disadvantages of low strength and short service life. In addition, the classifying wheel of the existing equipment uses metal, resin, and alumina as the body, and the classifying wheel needs to rotate at a high speed and is constantly subjected to Due to the repeated wear of the material, the main body is not wear-resistant and has poor impact resistance. It needs to be frequently disassembled and suspended under the upper part of the hundreds of kilograms heavy motor for replacement, which is very cumbersome and labor-intensive.

And the wear residue of the damaged classifying wheel is mixed into the powder, causing special changes in many physical and chemical properties of the powder, and the product is also discarded due to contamination, resulting in an increase in manpower and waste of products

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