SU1186249A1 - Centrifugal impact mill - Google Patents

Abstract

CENTRIFUGAL IMPACT MILL, containing a stepped body with reflective elements fixed on its side walls in the form of rows of projections adjacent to each other, installed in the body a stepped rotor with beams, in the form of pairs of perforated plates, the holes in which are arranged in a checkerboard shape, loading discharge nozzles, so that, in order to increase productivity and reduce the unit cost of energy, each perforated plate in the direction of rotation of the rotor you filled with a classification chamber, and stepped; the rotor has an axial cavity that communicates with the classification chambers through radial windows formed in its wall and with a discharge nipple - with the help of (Fan).

Description

The invention relates to the grinding of materials, and the material to impact mills, and can be used to obtain highly dispersed powders of various materials in the building, mining and metallurgical industries and other industries, in particular in the processing of plastics, fluoroplastic, poly vinyl chloride. The purpose of the invention is to improve performance and reduce energy costs. FIG. 1 shows the proposed centrifugal impact mill, longitudinal section; in fig. 2 - section A - L of Pas. one; in fig. 3 - bilon otrahsate.pltye. elements; on frgg. 4 section bb pa fig. 3. The centrifugal impact mill includes a housing 1 with a loading nozzle 2, a drive shaft 3 with a stepped rotor 4 carrying a 5 blades to: gassification cameras 6. The stepped rotor 4 is additionally equipped with an impeller of a fan 7 having a casing 8. On the housing 1 of the mill circumferentially mounted from1) the tensioning elements 9. Bilo 5 v. half-length of two parallel plates, each of which has holes 10 arranged in a checkerboard pattern, with the holes 10 in the adjacent plates displaced from one 0 to another by nojTOBJHiy step unscrewed stiy. Each reflective element 9 is made in the form of two adjacent rows of protrusions 11 of a trapezoidal shape. A larger base of the protrusions 11 is aligned with the housing 1, with the protrusions of one row being shifted in the axial direction relative to the projections of the other row by the thickness of the protrusion. Classification chambers 6 radial windows. 12, made in the walls of the axial cavity 13 of the rotor 4. With the help of the holes 12, through the axial cavity 13 of the pore 4, the classification chambers 6 are connected to the discharge pipe 1 at the fan casing 8. The fan impeller is mounted on the drive shaft 3 and leno on the rotor 4 by means of a disk 15. The mill housing 1 has a key b. Centrifugal impact mill works as follows. The step rotor 4, the bearing 5 and the impeller of the fan 7, is rotated by the shaft 3. The source material through the loading pipe 2 enters alternately at the beating of 5 grinding steps, starting from the first one, is crushed and accelerated due to hitting them and is thrown onto the reflective elements 9 installed in the housing 1. Upon repeated loading, the grinding is reduced. material, its fine particles formed between the perforated plates beat 5, under the action of air flow created by the blades 7 of the working wheel of the fan 7, are sucked out from the grinding zones of the first and subsequent steps of the mill to the classic chamber 6 and then through the axial cavity 13 the rotor 4 is fed to the discharge nozzle 14. Large particles of the material under the action of a centrifugal floor developed by the rotor 4 are dropped from the surfaces of the pitch 5 of each stage onto the reflective elements 9 and p dvergayuts regrinding. Thus, the fine fractions are in the grinding zone for a minimum of time and do not interfere with the processing of the coarse material. Due to the presence of 5 holes in the plates, 10 holes, and in the reflective elements, gaps between the protrusions 11, air is allowed to pass and the airbag is formed. Lastly, to the flow of particles and particles reflecting the flow of the elements, abruptly), their relative speed at the moment of impact of both the impact and the reflective elements. Therefore, the impact force of particles on the bilge and reflective elements increases, contributing to increased efficiency and grinding. The offset of the holes 12 in the adjacent plates hit 5 and the axial displacement of the rows of protrusions 11 in the reflective element 9 prevents material from slipping through the holes. Along with this, the vacuum in the grinding zones, carried out with the help of the fan 7, additionally creates favorable conditions for reducing the density of airbags on the working surfaces of the perforated plates. 5 and thus increases the shock loads on

particles of the crushed material, reduces energy consumption during rotation of the rotor 4.

The proposed mill with built-in internal classification) 1m

cameras allow to obtain a thin homogeneous product of a given particle size distribution and makes it possible to increase labor productivity and reduce the specific energy consumption for grinding.

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1186249

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Claims (1)

CENTRIFUGAL SHOCK MILL, containing a step housing with reflective elements fixed to its side walls in the form of rows of protrusions adjacent to each other, a step rotor installed in the housing with beats in the form of pairs of perforated plates, the holes in which are staggered, loading and unloading nozzles, characterized in that ·, in order to increase productivity and reduce specific energy costs, every second in a pair in the direction of rotation of the rotor perforated plate is made with a classification chamber, and a stepped’s rotor has an axial cavity communicating with the classification chambers through the radial windows formed in its wall and § with the discharge pipe — by means of a fan. SU „„ 1186249