SU755300A1 - Electromagnetic mill - Google Patents

Description

The invention relates to apparatuses intended for grinding solid materials and can be applied at enterprises of color and black metallurgy and chemical industry. ti.

Known ball drum mill for fine grinding of materials, the body of which consists of. alternating rings made of magnetic and non-magnetic material, with the magnetic poles attached to the rings of the magnetic material.

In this mill, optimal grinding regimes are created in its different zones. The disadvantage of this mill, like all drum, is the low specific performance

M · 20

A electromagnetic mill is known that contains a traveling-field electromagnetic system and a grinding chamber ’, within which a rigidly fixed core is located, and the grinding chamber is made with the possibility of free rolling with eccentricity over the core. Although this mill is a productive unit, but so

2

as electromagnetic interaction occurs through the air gap, therefore the mill, like an electric machine, has a low power factor NPO of its technical essence, the closest to the invention is an electromagnetic mill, for grinding solid materials, containing a cylindrical body with end caps and windows for pole pieces of electromagnets, leading a grinding body freely placed in the housing in the form of a hollow roller of magnetic material and.

The disadvantage of this mill is the low efficiency of electromagnetic interaction between electromagnets and the grinding body - roller, because the magnetic flux closes along the way: electromagnet - nonmagnetic body (lining) - roller - air gap - nonmagnetic body (lining) - adjacent electromagnet, i.e. several sections of the magnetic circuit have significant magnetic resistance (air gap and non-magnetic body - lining). Cro3

755300

four

besides annular grooves on the outer surface of the roller increase the magnetic resistance and do not completely eliminate the losses to induction currents;

The purpose of the invention is the intensification of the grinding process by increasing the efficiency of electromagnetic interaction.

This goal is achieved by the fact that in the electromagnetic mill "θ

for grinding a solid material containing a cylindrical body with end caps and windows for pole pieces of electromagnets that drive a grinding body freely placed in the body as a hollow roller, the central part of the body located between the electromagnets is made in the form of a nonmagnetic material shell ,, And the end parts of the body, enclosed between the end covers and the central shell, are made of wear-resistant material. The end parts of the roller, located in the end parts of the body, are made of wear-resistant material.

In addition, the magnetic body of the roller is made in the form of a package of electrically insulated disks in contact with the pole tips of electromagnets.

FIG. 1 schematically shows an electromagnetic mill, and FIG. 2 is a section A-A of FIG. one.

The mill consists of a housing 1 with end caps 2, an electrical system of * ⁵ "* magnets 3 and a grinding body · - a hollow roller closed at the ends of the roller 4. In turn, housing 1 consists of cocks, tail shells 5 and a central shell 6. Shell 5 is made of a hard wear-resistant material, and the shell 6 is made of a non-magnetic material.

In the shell 6 there are windows in which the pole pieces 7 of the electromagnets 3 are tightly inserted. The housing and 45

electromagnets with coils 8 are attached to the bed 9. The roller 4 consists of rings 10 made of hard wear-resistant material and a package of electrically insulated disks 11 made of magnetic material. Rings 10 roller located inside the housing 1, and the package of disks 11 - inside the shell 6, touching the 'pole tips' 7. The device has 12 boot and 13 discharge pipes. 55

The mill operates as follows ^ - By alternately connecting the windings of electromagnets 3 to a current source inside housing 1, a magnetic field occurs, resulting in a grinding body, roller 4, with rolling rings moving around the inside surface of the housing 5 bodies 1. effective electromagnetic interaction takes place, since the disks 11 of the roller, made of magnetic material, have the ability to directly touch the pole tips, and in the package of electrically insulated disks 1 2 losses to induction currents are small.

As a result of the movement of the roller 4 in the housing due to the centrifugal force and the force of one-sided magnetic attraction, intensive grinding of the material entering the mill through the loading nozzle 12 occurs. Through the nozzle 13 the crushed material is unloaded. Grinding occurs mainly between the shells 4 and the rings 10, made of solid wear-resistant material.

During the operation of the mill, there will also be wear on the pole tips 7 · and discs 11, which will be determined by the wear of the shells and rings 10 and will not lead to a noticeable deterioration of the electromagnetic interconnection. action and intensity of grinding, as the listed parts are worn out, they are replaced.

This electromagnetic mill has a greater, compared to the known efficiency of electromagnetic interaction, (power factor is more than 2 times and approaches the performance of the electric motor), which ultimately leads to the intensification of the grinding process.

Claims (2)

Claim 1. Electromagnetic mill for grinding solid materials, containing a cylindrical body with end caps and windows for pole tips of electromagnets, which cause the grinding body freely placed in the body in the form of a hollow roller made of magnetic material, characterized in that, in order to intensify grinding by increasing the effective-. electromagnetic interaction. The central part of the housing, located between the electromagnets, is made in the form of a shell of a nonmagnetic material, and the casing parts enclosed between the end caps and the central shell are made of wear-resistant material, while the end parts of the roller, located in the end parts of the housing, are made of wear resistant material. 2. Mill pop. 1, I differ from the fact that the magnetic body of the roller is made in the form of a package of electrically insulated disks in contact with the pole tips of electromagnets. 755300