SU641995A1 - Milling arrangement - Google Patents

Description

one

The invention relates to devices for grinding solid materials and can be used in the cement, energy, mining, chemical and other industries associated with grinding materials.

A device for grinding is known, comprising rolls rotating towards one another, loading and unloading devices 1,

The crushable material flows through the loading device into the crusher from above, drawn by rotating rollers into the space between them and is crushed here. The gphi of a gap between the rolls of a few millimeters and less such a structure is considered as a roll mill. It may consist of several pairs of cylindrical rollers arranged one above the other for successive grinding of the material.

Roller cylindrical mills were not widely spread in industry due to the known complexity of operation, as well as the fact that the crushing principle does not provide for most fine grinding materials.

The closest technical solution to the invention known is the grinding device, which includes a housing, a loading and unloading chute, grinding bodies G2 |

The mill body is a hollow drum, closed with end caps, equipped with loading and unloading pins. The drum rotates around a horizontal axis. It is filled with about half a splitting medium (crushing bodies). When the drum rotates, the crushing bodies, due to friction, are entrained by it. In a 1-matched surface, they rise to a certain height, whence they roll freely, fall down, exposing the material to

shallower. Compare the low output of products per unit of volume to the remnants of the bargebane mills, which is explained by the fact that the grinding zone takes a small amount of the working volume and that it is impossible to increase the rotational speed of the drum boxes when the critical speed is reached ( the normal drum speed is 0.7-0.85% of the critical rotational speed).

The purpose of the proposed invention is to increase the intensity of grinding

This goal is achieved by the fact that the grinding device, including a hull, a loading and unloading chute, and a milling body, is provided with a group of wolves located with a gap relative to each other and rotating in the same direction from autonomous drives.

In addition, the device can be equipped with an additional group of rolls arranged symmetrically to the main group's rolls and rotating in directions opposite to the main group's rolls from additional autonomous drives, where the main and additional groups can be placed along a circular arc.

FIG. 1 is a diagram of a grinding device with one group of rolls in FIG. 2 is a diagram of a grinding device with two groups of rolls.

The grinding device includes a stationary body 1, an emergency unit 2 and an unloading unit 3 chutes, rolls 4, crushing heat 5 together with. ground material.

The rolls are fixed in the pivots, taken out of the case. Bearing drive also removed from the housing.

The rolls have a wear-resistant lining with a high coefficient of adhesion. In a number of cases it is possible to use, for example, a resilient lining.

The rolls 4 (Fig. 1) are placed with a gap relative to each other and rotate in the same direction from autonomous drives to. NA shown)

The rolls 4 (FIG. 2) can be set along a circular arc,

In the case of a device with a VAPK cop group with one set; full rotation (FIG. 1), the swath

its speed, the use of the working volume are close to the baraba} hay mill; only grinding of the material due to its friction between the rollers and the adjacent loading layers is added,

Thus, in a grinding device, grinding occurs as a result of the collision of the inward loading streams, the fall of the material and the milling bodies onto the material, the friction of the material between the rollers and the adjacent loading layers and is carried out with a large amount of working volume and at higher speeds than in drum mills, which, in comparison with them, as well as roller cylindrical mills, will result in a higher removal rate per unit volume of equipment.

The grinding process in the grinding device (Fig. 2) is as follows. The material is fed to the grinding through the loading chute 2, evenly distributed along the length of the device and falls on the rolls 4. The group of left-turning rolls lifts the grinding bodies and the material in the left half of the device, the group of right-spinning rolls similarly raises the gap in the right half. The material and grinding bodies lifted by the rolls rush two threads towards each other and down, as shown by arrows in FIG. 1, The optimal mode of the aid is selected by adjusting the speed of rotation of the rolls, the fill ratio of the device, the number and diameter of the rolls. The shredded material passes into the interstitial gaps and is discharged through the chute 3. It is also possible that the material is pneumatically discharged, especially if the material is simultaneously suspended with gases. In this case, it is advisable to direct the gases in countercurrent to the loaded material. In order to prevent the accumulation of material between the rollers 4, each subsequent roll in each group is given an increase in its speed as the material is raised.

Performing the grinding device according to the invention will significantly increase the grinding intensity.

Claims (3)

1. Grinding device, including Kopityc, boot and razg | chute, mega bodies, differing from the fact that, in order to increase the intensity of the help, it is provided with a group of rolls placed with a gap relative to each other and facing in the same direction from autonomous drives. 2. A device according to claim 1, 1 and 2 with the fact that it is provided with an additional group of rolls, installed symmetrically to the main rolls and rotating in directions opposite to the main rolls from additional independent drives. 3. The device according to PP. 1 and 2, that is, the rolls of the main and additional groups are placed along a circular arc. Sources of information taken into account in the examination. 1. Andreev C, E, and others. The fragmentation, grinding and screening of minerals, M, 1966, p. 2 About 8. 2. Il'evich A, P, Equipment for silicate production plants. Gosstroyizdat, M ,, 1959, p. 214-215.