SU925388A1 - Drum mill - Google Patents

Description

(54) DRUM MILL

The invention relates to drum mills, the drum of which is loaded with material that is crushed using special elements located in the drum of the mill, and can be used in the mining, chemical, metallurgical and other sectors of the industry.

A known drum mill for grinding rocks, comprising a cylindrical body with a diameter greater than its length, which causes a self-ground material 1.

The casing of the known mill is provided with reflective rings to prevent segregation of the material in the working space of the mill.

However, their presence only leads to a significant reduction of the material of critical size when grinding, that is, too large and durable to be destroyed by the largest pieces of incoming material, and too small to produce impact destruction to the required size (smaller particles.

The presence in the working area of material of critical size leads to an increase in the degree of filling of the mill and, consequently, to a decrease in its productivity and an increase in the energy intensity of the process.

According to its technical essence, the closest to the invention is a drum mill with a cylindrical body with a discharge window and grinding mills mounted on a common axis with pressure devices 2.

A disadvantage of the known mill is that, being designed primarily for grinding highly moist materials, the size of the source material in it is limited by the level of permissible deformation of the pressing.

15

This is due to the implementation of the cylindrical body of the drum with a diameter significantly smaller than its length.

In this case, in the famous mill, the rollers are each installed in a specific position relative to a common axis.

All this in general does not allow to increase the productivity of the mill and reduce energy costs.

The aim of the invention is to increase the productivity of the mill and reduce energy consumption by selective regrinding.

The goal is achieved by the fact that in a drum mill containing a cylindrical

30, a housing with an unloading window and grinding mills mounted on a common axis with pressure devices, a part of the casing impinging on the unloading window is made conical, and the milling rollers are mounted for movement along a common axis within the conical part of the body.

Making grinding rollers elastically compressed to the classifying conical surface of the body is necessary to implement the material, which changes during processing of the particle size, which allows to process all the material coming to the grinding and thereby increase the productivity of the mill.

Fixing the grinding rollers on the longitudinal axis installed in the mill casing with the ability to move along it makes it possible to place them in the accumulations of material of critical size, to perform forced restoring of the material not capable of self-destruction, concentrated on the α-defined zone of the conical surface of the casing.

FIG. il shows a drum mill, general view, section; in fig. 2 is a section A-A in FIG. one.

The drum mill contains a korsus 1, the length of which is cylindrical, to ensure self-grinding of the material less than its diameter. In the conical part of the housing 1 there are grinding bodies in the form of cylindrical rollers 2 placed along the inner perimeter of the conical flange of the housing 1. The rollers 2 are mounted on freely sliding axles parallel to the generator spring 3. The rollers 2 are fixed on an axis mounted in the mill housing 4, the latter coincides with the central longitudinal geometric axis of the mill and is installed freely relative to its body. The rollers 2 are fixed on axis 4 with the possibility of moving along it to the places of accumulation of material of critical size. In this case, the length of the roller is selected from the conditions for ensuring that the zone overlaps with it, the accumulation of material of critical size, equal to 9-11 times the size of its maximum piece.

The mill operates as follows o6ga.

Material to be ground

fed to the cylindrical part of the mill housing 1. As the mill rotates, the material to be ground rises to a certain height and falls down. In the grinding process, pieces of material hit each other and against body 1 and are self-chopped. The passage further to the unloading window 5 of the mill was not destroyed by self-grinding.

the material segregates by size in the conic part of the casing 1. At the same time, the material is crushed between Corzus 4 and rollers 2. Rollers 2 installed at the site of material accumulation critical

size, rolling on the housing 1, crush destroy untreated material. Then, the material ground to a given size is delivered from the mill by one of the known methods,

for example, compressed air.

The use of the proposed drum mill Ensures an increase in productivity and reduction of electricity consumption for grinding, due to the possibility of regrinding of the material of critical size on the classifying surface.

The economic effect, determined on the basis of one mill, with a capacity of 50 tons per hour, will be more than 12.5 thousand rubles. in year.

Claims (2)

Invention Formula A drum mill containing a cylindrical body with a discharge window and grinding mills mounted on a common axis with pressure devices, characterized in that, in order to increase productivity and reduce energy consumption by selectively grinding, the part of the body adjacent to the discharge window is conical and the grinding Rollers installed with possibility of movement along the axis within the conical part of the housing. Sources of information taken into account in the examination: L Yashin V. A. and others. Theory and practice of self-grinding, M., "Nedra, 1978, p. 15. 2. USSR author's certificate No. 654284, cl. B 02 C 17/18, 1977.  ,