SU677760A2 - Centrifugal mill - Google Patents

Description

(54) CENTRIFUGAL MILL

The invention relates to centrifugal mills for the grinding of various materials and may find application in the chemical industry, industrial construction materials, mining, food and other branches of the national economy.

In auth. St. No. 194534 describes a centrifugal mill for grinding various materials, containing two bowl-shaped disks arranged one against the other and fixed coaxially on horizontal shafts. Between the disks there is a fixed position; an intermediate ring is installed, equipped with a feed funnel. A rotor with beams is mounted inside the intermediate ring.

The feed material is subjected to primary grinding and biling, then is thrown into the action area of the growing cup-shaped disks. By writing, the material is again thrown into the un of the stationary ring and again struck.

A disadvantage of the known centrifugal mill is the low productivity, limited by the size of the discharge gaps, the long residence time of the comminuted material in the mill, and as a result, its overmilling, which worsens the fractional composition due to the increase in the fine fraction.

The present invention is a further improvement of the centrifugal mill according to ed. St. No. 194534 and aims to increase productivity and reduce the degree of overgrinding of the material.

This goal is achieved by the fact that the mill is equipped with a vrasyk dimis and additional fixed rings mounted on each side of the main fixed ring, each rotating ring being complete with radial plates mounted inside it at an angle to the plane of the perpendicular forming ring.

FIG. 1 shows a general view of the Mepvdian in a weed section; in fig. 2. - section A - in FIG. one; in fig. 3 is a section BB in FIG. one; in fig. 4 is a section on BB in FIG. one.

The centrifugal mill contains two rotating bowl-shaped disks 1 opposed to each other mounted on a horizontal shaft 2. The shaft rests on bearings 3. In the center of the mill between the bowl-shaped disks 1 they are coaxially mounted But a fixed intermediate ring 4 fitted with a feed funnel 5. Inside the fixed ring On the same Horizontal Shaft 2, a rotor, a torus 6 is mounted with beaters 7 & in the form of a set of separate plates 8 arranged at an angle to the plane perpendicular to the generatrix of the ring. Between cup-shaped discs 1 and. a fixed intermediate ring 4 is mounted on each side of the column 4 at least one more rotating shaft 9 and one fixed ring y.

Between the ends of the cup-shaped disks 1 and the adjacent rings 10, 9, and 4 there are gaps 11, which serve for the tgruums of the crushed Shtö {Hsh1a, adjustable by means of the adjusting rings 12. The rotating pegs 9 are provided with radial plates 13, installed inside them at an angle to the Plane, perpendicular to the forming column. These plates can be combined with the spokes connecting the rings with their hubs 14. The movable and fixed elements of the mill are enclosed in a common housing 15.

Centrifugal mill works as follows.

The material to be crushed through the feed funnel 5 enters the intermediate stationary ring 4, where it is subjected to primary grinding by the billes 7 and is dropped by centrifugal forces by the inclined plates 8 towards the rotating rings 9. The processed material subjected to the primary grinding is accelerated by the inclined plates 13 the action area of the rotation of the discs is shaped by the disks 1. The material is again thrown back into the action area of the inclined plates 13 and subjected to impact, etc. until the particle size of the crushed material reaches the target.

The crushed material is discharged through the gaps 11, the number of which provides the necessary productivity of the mill. The air flow that is sucked into the mill by inclined plates 13 of the rotating rings 9 and out of the mill through the gaps 11 together with the crushed material also contributes to the unloading of the crushed material of the grinder.

Technical and economic advantages of the proposed centrifugal mill. Compared with the known ones, the degree of overfilling of the material in it is reduced by 2O-25% due to a decrease in the residence time of the comminuted material. At the same time, the productivity of the Mill is also increased by 1.7-2 times due to the increase in the total area of unloading gaps between the rings and different discs.

Claims (1)

Invention Formula Centrifugal melnitsa on ed. St. No. 194534- characterized in that, in order to increase productivity and reduce the degree of material rebirth, the mill is equipped with rotating and additional fixed rings mounted on each side of the main fixed ring, each rotating the ring is made with radial plates mounted inside it at an angle to the plane perpendicular to the ring.