SU1701369A1 - Apparatus for fine grinding - Google Patents

Abstract

The invention relates to installations for the fine grinding of materials. The goal is to improve the quality of the finished product and the grinding efficiency. The installation includes a hopper 1 with a nozzle 16, grinding chambers 3, 6, 7, rotors 4, a separator 8, a regulator of the size of the annular gap 15 and a cyclone 10. Supply of the installation with a separation system, and the loading hopper - an air supply nozzle and performing grinding at the top chambers of the holes provides a multi-stage grinding and obtaining a material of a narrow granular composition, which improves the quality of the finished product and the efficiency of grinding. 1 il.

Description

The invention relates to the field of fine grinding of materials and substances and can be used in the metallurgical, ceramic, chemical industry, building materials industry, the agricultural industry and other sectors of the national economy.

The goal is to improve the quality of the finished product and the efficiency of grinding.

The drawing shows the installation diagram.

The installation includes a hopper 1 with a loading device 2, grinding chambers 3,4,5, rotors of a hammer 7, a separator 8, a pipeline 9, a cyclone 10, a housing of a centrifugal separator 11, a discharge pipe 12, a drive of a separator wheel 13, a separator wheel 14, the controller 15 size of the annular gap, the pipe 16, the controller 17 of the flow of air (gas).

The installation works as follows: iOM. The material i3 of the bunker 1 to be crushed by the loading device 2 is put into the front chamber 3, where it is crushed by the blows of hammers 7,

fixed by the rotating rotor 6. Through the pipe 16, through the air flow regulator 17, air enters the front chamber 3, which picks up fine particles and transports them into the middle chamber 4. 3 particles that are not picked up are fed into the middle chamber 4 by hammers 7 air flow. When entering the middle chamber 4, the solid particles are subjected to intensive interaction with particles dispersed in the middle chamber 4 by hammers. The directions of rotation of the rotors and hammers in the middle chamber 4 are opposite to the rotation in the front chamber 3. Particles from the middle chamber 4 are thrown into the tail chamber 5, experiencing intense the impact of particles moving along the inner contour of the tail chamber to the place of its conjugation with the middle chamber 4. Particles moving along with the air flow through the middle chamber also come here . Fine particles, together with the part mechanically carried away

ABOUT

WITH

of non-conforming grains from the tail chamber 5 through the opening in the upper part of the air stream is carried to the separator 8, and the bulk of coarse grains continues to remain in the volume of the tail chamber 5 until their dispersion does not correspond to the characteristics of particles carried by air flow into the separator 8.

In the separator 8, entrained substandard particles fall out of the solid-gas mixture flow, which, under the action of gravity through the openings in the upper part of the tail chamber 5, flow into its volume.

The mixture partially removed from the coarse-grained particles in the separator 8 of the solid-gas mixture enters the cyclone 10 through the nozzle 9, where the mixture is additionally cleaned of substandard particles that, falling on the conical walls of the cyclone 10, under the action of gravity through the annular gap formed the outer surface of the regulator, the size of the annular slit 15 and the inner surface of the nozzle from the cyclone 10, pass through the hole in the upper part of the middle chamber 4 and enter its volume

The solid-gas mixture from the cyclone 10 enters the casing of the centrifugal separator 11 and then into the zone of action of the separator wheel 14, which is driven into rotation by the drive 13. Under the action of centrifugal forces created by the separator wheel 14, the ground product is finally cleaned of substandard particles. The solid particles precipitated from the stream are lowered into the lower part of the cyclone 10 and further into the volume of the middle chamber 4

Narrowly classified fine particles together with air through pipe 12 enter the dust collection and dust cleaning system.

Due to the multi-stage grinding process and the classification laid down in the design, conditions are created for obtaining a fine material composed of particles, the size of which is concentrated in a relatively narrow size range,

The presence in the designs of the nozzle 16 with an air flow regulator 17, as well as openings in the upper part of the middle 4 and tail chambers 5 and the classification system for grinding products allows to implement a multi-stage grinding process with the production of fine materials concentrated in a narrow size range. In addition, the design allows the process to be carried out in advance

formed a gaseous environment and to regulate the dispersion of the resulting particles, which improves the quality of the finished product. The ineffective interaction of hammers with solids that have reached

of a given size, and therefore, reduced abrasive wear and increased mill productivity.

Claims (1)

Claims An apparatus for fine grinding of materials, comprising grinding chambers, rotors with hammers, breaker plates and a hopper, in order to improve the quality of the thin product and the efficiency of grinding. it is equipped with a system for separating solid particles, and the loading hopper is equipped with an air supply nozzle into the volume of the first chamber, with openings communicating with the separation system in the upper part of the subsequent chambers # 4 5