SU880488A1 - Electromagnetic mill-mixer - Google Patents

Description

(54) ELECTROMAGNETIC MIXER-MIXER

I

The invention relates to devices for fine grinding of lump materials and may find wide application in the building materials industry, in metallurgy and other sectors of the national economy.

A device for grinding is known, which contains a stationary working chamber with ferromagnetic loading, loading and unloading pipes, solenoids, which are located around chamber 1.

A disadvantage of this device is that it is suitable only for fine grinding of the powder material. Attempting to grind solid pieces of material leads to a drastic increase in energy consumption, reducing the reliability of the equipment.

Closest to that proposed by technical dryness is an electromagnetic mill-mixer, containing a grinding drum with a grinding load of ferromagnetic bodies and electromagnets enveloping the drum, made in the form of solenoids 2.

This device is characterized by unsuitability for grinding a lumpy material, since the quality of the processed material in the chamber depends on the energy of the magnetic bodies, which is limited by the properties of the material from which the ferromagnetic particles are made. The disadvantages include the high energy consumption due to the heat of the solenoids caused by high inductive resistance with increasing number of turns to create large electromagnetic fields.

The purpose of the invention is to increase the grinding intensity of the lumpy material.

This goal is achieved by the fact that an electromagnetic mill-mixer, containing a grinding drum with grinding 5 loading of ferromagnetic bodies and electromagnets encompassing the drum; made in the form of solenoids, provided with a cylindrical pre-grinding mill located concentrically in the grinding drum, and the annular cavity between the chamber and the drum is divided into longitudinal sections by radial partitions, the walls of the preliminary grinding chamber made of magnetoelastic plates radially directed in the longitudinal planes, installed with a gap between them. FIG. 1 shows a mill, a longitudinal section; in fig. 2 is a section A-L in FIG. i; in fig. 3 - node I - fastening of magnetoelastic plates. Electromagnetic mill-mixer contains stationary solenoids I, inside of which is located the grinding drum 2, made of non-magnetic material and filled with ferromagnetic bodies 3 of magnetic-rigid material. The drum is divided by radial partitions 4. into compartments and has a transverse grid 5 installed at the outlet of the finished product of chamber 2. Inside the drum 2 there is a pre-grinding chamber 6, the walls of which are made of magneto-elastic plates 7, and filled with grinding balls 8 (steel or ceramic 50-200mm) Radial partitions 4 can be located at a distance of 100-1000 mm from each other, which is calculated depending on the diameter of the pre-grinding chamber 6 and drum 2. The distance between the radial partitions less than iOO mm leads to a decrease in the mill productivity and an increase in metal intensity, and a distance greater than 1000 mm decreases the intensity of grinding by reducing the frequency of the impact of ferromagnetic bodies. The planes of the magnetoelastic plates 7 are located in the radial direction along the generatrix (or may be offset relative to each other in the form of ledges) at a distance of 3 mm, and their ends are laid loosely in the grooves 9 of the support flange 10 and fixed by an abutment ring P. The thickness of the magnetoelastic plates 7 can be 1 - 10mm, depending on the size of the grinding balls, the larger the size of the grinding balls, those.m are greater in thickness. During the selection of the fines from the drum 2 with the help of air, the transverse grille can also be installed at the inlet, depending on the engineering solution of the inlet nozzle). The location of the pre-grinding chamber 6 inside the drum 2 allows the crushed material to be sifted between the plates throughout the volume of the chamber 6 and, without additional vehicles, be distributed directly into the drum 2 for further fine grinding. The location of the pre-grinding chamber 6 concentric with the axis of rotation of the drum 2 contributes to the uniform filling of the latter with ferromagnetic bodies and their intensive movement. Making the walls of the pre-crushing chamber 6 of magnetoelastic plasticines 7 located at a distance of no more than 3 mm from each other contributes to a better destruction of the lump material, since the grinding occurs not only due to strikes of steel balls, but also due to abrasion of the material on the protruding edges of the magnetoelastic plates. When the distance between the magnetoelastic plates of more than 3 mm is increased, the intensity of fine grinding decreases significantly, since ferromagnetic bodies are exposed to a small mass (the size of magnetic bodies is 2-10 mm) and are capable of grinding the material with pieces no larger than 3 mm most intensively. With an increase in the size of 10 mm ferromagnetic bodies, they are demagnetized. The size of the ferromagnetic bodies is selected depending on the specified grinding fineness of 2-10 mm, but not less than the size of the distance between the magnetoelastic plates. For example, to obtain a powder with a specific surface area of up to 10,000 cm / g, ferromagnetic bodies of 2–3 mm in size must be loaded. Drum separation by radial partitions allows ferromagnetic bodies to remain in their compartments during the rotation of the mill, and therefore increase the grinding intensity throughout the whole I need a drum 2. If, when grinding two or more kinds of material, it is necessary to produce a homogeneous grinding product, the radial partitions can be made perforated. Sharov Mill works as follows. Ferromagnetic bodies are loaded into the drum 2 for 1 / 2-2 / 3 of its volume, and grinding media are loaded into 1/3 of its volume into the pre-grinding chamber 6. Both cameras are driven from one drive at a speed of 20-60 rpm. Solenoids i are connected to the AC mains. under the action of which an alternating magnetic field is formed, causing oscillations of the magnetic plates and the chaotic motion of ferromagnetic bodies. Lumpy material of up to 200 mm in size is fed to the pre-grinding chamber, where it is crushed to a fineness of 1-3 mm on the edges of the magnetoelastic plates by grinding bodies moving as the chamber rotates. The crushed material passes (sieved) between the magnetoelastic plates into the drum 2, where it is crushed to the required fineness by randomly moving ferromagnetic bodies. The finished material passes through the transverse grid. 5 into the bunker of the finished product, and the ferromagnetic bodies are trapped by the same grid.

Claims (1)

Claim An electromagnetic mill mixer containing a grinding drum with a grinding charge from ferromagnetic bodies and solenoids in the form of solenoids covering the drum, characterized in that, in order to increase the grinding intensity of the lumpy material, it is equipped with a cylindrical pre-grinding chamber located concentrically in the grinding drum, and an annular cavity between the chamber and the drum is divided into ^five longitudinal compartments by radial partitions, the chamber wall prior MOD lcheniya made of radially-directed in longitudinal planes magnetoelastic plates ₁₀ GOVERNMENTAL mounted with a gap between them.