RU2065770C1 - Grinding mill - Google Patents

Abstract

FIELD: superfine grinding and classification of materials mainly not very hard for use in various industries. SUBSTANCE: in horizontally installed cylindrical body 1, beater plate is made in the form of multiple horizontal strips 2 mounted on inner wall of body with end face pointed towards direction of rotation. Mounted on bottom over periphery at clearance as to wall are replaceable baffles 13 of triangle shape. Rotor carries two coaxial disks with radial blades 6 forming taper-shape surfaces during rotation. Ends of blades protrude beyond disks and have knives. Lower disk has central opening. Bottom has central hole and is provided with shoulder 12 for forcing product into underneath coaxial peripheral and central bins. Central bin is provided with funnel. Hole is made in chamber inner wall together with bin and pipe connection for collecting incompletely ground material. EFFECT: high efficiency. 6 cl, 2 dwg

Description

 The invention relates to techniques for ultrafine grinding and classification of materials, mainly with low hardness and can be used in powder metallurgy, mining, enrichment, chemical, medical, food, construction industry, etc.

Closest to the proposed device is a centrifugal mill, which contains a housing, a rotor made of two coaxially mounted disks and radial blades between them, loading and unloading leaks, a casing on the rotor disks with cutouts, a baffle plate [1, prototype]
The disadvantages of a centrifugal mill are low dispersion and a wide particle size distribution of the resulting product.

 An important task is to improve the quality of the product, in particular, increase the dispersion and improve particle size distribution.

 The solution to this problem is achieved by the fact that the cylindrical body of the mill is installed horizontally, the baffle plate is made in the form of many horizontal plates with a pointed end facing the rotation of the rotor, which are mounted on the periphery with a gap on the periphery with a gap to the body wall, removable targets of a triangular shape with a sharp end towards the rotation of the rotor, the rotor contains two coaxial discs with radial blades forming conical surfaces of the peaks during rotation th up, the cones of the blades go beyond the disks and are equipped with knives above and below, scrapers are installed on the rotor disks above and below, the bottom disc is made with a central hole, the bottom has a hole in the center equipped with a border to remove the product into the peripheral coaxial and central bunkers, the last with a removable socket, as well as an opening near the inner wall of the chamber, equipped with a hopper with a pipe for collecting under-ground material. All bins are equipped with devices for the output of products and under-ground material. A metered unit, a gas inlet pipe and a filter are installed to relieve excess pressure.

 In FIG. 1 shows a mill. In FIG. 2 target of a triangular shape.

 The mill comprises a housing 1 with plates 2 mounted on a wall inside, a metering unit 3, a rotor from an upper drive disk 4, a lower disk with a central hole 5, radial blades 6, scrapers from below and above 7, ending with knives 8, coaxial peripheral 9 and a central hopper 10, the bottom of the housing 11 with a hole in the center equipped with a border 12, interchangeable targets in the form of a pointed triangle 13, an outlet pipe for underfinished material 14 with a hopper 15, a device for removing material 16, a gas inlet pipe 17, a filter p for pressure relief 18, a removable socket 19, rotation of the rotor drive 20.

 The mill operates as follows. Gas is introduced through the pipe 17 to create the necessary atmosphere. The drive 20 rotates the rotor and, using the metering device 3, feeds the material into the mill 1 (the shutters 16 are closed). The material enters the drive disk 4 and is scraped by the scrapers 7 to the cylindrical wall, where it is entrained in rotation by the gas flow created by the radial blades 6. The particles of the material collide with targets 13, knives 8 and plates 2, are crushed, creating a gas-dust “plasma” of neutral and charged particles. Under the action of vortices created by radial blades, closer to the center, small particles, mostly negatively charged, are carried away. In this case, stationary clouds are created further from the body wall, mainly from negatively charged particles, which expand towards the center against the action of centrifugal forces and fall through the hole in the center of the bottom into coaxial bins 9 and 10, while smaller ones fall into the central bunker 10, where they are discharged through gas and in contact with the surface. Plates 2 provide a uniform distribution of material in height. Replaceable bell 19 controls the "capture section" of the particles, the curb 12 on the bottom 11 prevents accidental ingress of large particles into the hopper 9 without charging and selection. The lower scrapers 7 prevent the accumulation of material in the "dead" zone. Through the filter 18, excess gas pressure is removed due to heating of the device. After stopping the supply of material, the mill is left to work for some time, then the remnants of the underfinished material are removed through the pipe 14 into the hopper 15 and the rotor is stopped. The accumulated material is removed from the bins 9, 10 and 15, and the smallest fraction is collected in the bunker 10. If necessary, an inert gas is introduced to compensate for the pressure due to the cooling of the mill.

Claims (7)

 1. The mill, containing a cylindrical body with a baffle plate on the inner surface, a rotor of two coaxial disks, one of which has a Central hole connected by radial blades, a device for input and output of material, characterized in that the mill is equipped with scrapers placed above and below rotor, the axis of the housing is vertical, the baffle plate is composed of horizontal plates, while the edges of the radial blades protrude beyond the discs with the formation of a conical surface with the top up, bottom orpusa has openings at the center and the periphery, wherein the central bore is equipped with a border, and output device are in the form of material coaxially disposed hoppers communicated with a central opening, and hopper connected with a peripheral opening for nedoizmelchennogo material.  2. The mill according to claim 1, characterized in that on the bottom from the bottom with a gap to the inner wall of the casing are mounted interchangeable targets of a triangular shape with a sharpness towards the rotation of the rotor.  3. The mill according to claim 1, characterized in that the ends of the horizontal plates are pointed towards the rotation of the rotor.  4. The mill according to claim 1, characterized in that at the ends of the blades, knives are mounted on top and bottom.  5. The mill according to claim 1, characterized in that a replaceable bell is mounted on the central hopper.  6. The mill according to claim 1, characterized in that a filter is mounted on top of the housing to relieve excess pressure.  7. The mill according to claim 1, characterized in that a filter is mounted on the hopper for the underfinished material to relieve excess pressure.

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