Segregation type centrifugal material screening and grading technology and special device thereof

Abstract

The invention relates to a segregation type centrifugal material screening and grading technology and a special device thereof. Material is fed from a feeding cylinder above the center of a sieve; the material is uniformly fed to the sieve surface through a spiral feeding device at the top of a feeding cone; after leaving the feeding cylinder, under the action of gravity, the material is uniformly distributed through the feeding cone and drop to the sieve surface; under the effect of the segregation effect, the material is firstly preliminarily layered into particles with different particle sizes (r), the small particles accumulated on the periphery of the center of the sieve surface and the larger particles more away from the center; and meanwhile, due to the fact that radiation-shaped sieve strip gaps B (sieve seams) are wider and wider from the center to the outside, and the small particle materials are firstly screened thoroughly through a narrower sieve gap which is close to the center part. According to the technology and the special device thereof, material movement and separation are promoted by virtue of centrifugal force generated by rotation, more energy is saved compared with driving material movement by simply using vibration, screening of moisture-sticking materials and light substances is more efficient, and separation of particle grades of finished product material is more flexible.

Description

technical field [0001] The invention belongs to the key technical fields of construction waste recycling, application and preparation of recycled materials, and specifically relates to a novel material screening and grading method and device thereof applied to construction waste classification and recycled material processing technology. Background technique [0002] In metallurgy, coal, building materials, chemical and food processing and other industrial sectors, screening operation is an important production link, and a large number of screening machines are required. The dry screening operation is a process in which materials are fed to a screening machine equipped with a sieve surface. After the particles are compared with the sieve holes through the projectile movement, the particles smaller than the sieve hole size pass through the sieve. The current commonly used screening method is that the material passes through the inclined screen surface (such as figure 1 ), un...

AI Technical Summary

Problems solved by technology

When the particle size d>1.5a (a is the sieve aperture), the particle is difficult to enter the sieve to participate in separation; when the particle size d<0.5a, the particle is easy to pass through the sieve; when the particle size When 0.5a<d<1.5a, this part of the particles is the key separated particles, which directly affects the output and screening efficiency of the screening machine

When sieving wet or fine materials, it is difficult to achieve the desired layering effect between materials

Factors affecting the separation effect include particle size composition, particle shape and sieve form of the material. When the particle is 0.5a<d<a, it often needs to pass through the sieve after several comparison attempts, while a<d<1.5a is easy to cause sieve failure. network jam

Not suitable for dry deep screening of wet, viscous, hard and fine materials

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