SU915946A1 - Centrifugal ball mill - Google Patents

Description

The invention relates to centrifugal ball mills for grinding solid materials and materials of medium strength, such as cement clinker, limestone, etc., and can be used in the building materials industry, chemical and mining industries.

Known 'centrifugal ball mill, comprising a stationary body, vertically located inside a rotating conical grinding chamber with a cantilever shaft, a dome with a hole in the upper part [1].

The disadvantage of the mill is the low efficiency of the grinding process, strong wear of working surfaces.

The purpose of the invention is the intensification of grinding, increasing the durability of the structure.

This goal is achieved by the fact that in a centrifugal ball: the mill, comprising a fixed body, vertically located inside it. rotating conical grinding chamber with a cantilever shaft, a dome with a hole in the upper part, the dome is made in one piece with a conical grinding chamber, and the shaft is made

2

hollow with blades mounted in it and connected via channels ₍ to the grinding chamber, the shaft can be provided with a replaceable expanding nozzle downwards.

The drawing schematically shows the proposed mill.

The mill contains a grinding chamber _1P RU, made in the form of a conical 'θ bowl 1 with a spherical dome 2 with

hole 3, a hollow cantilever shaft 4, with blades 5, mounted on bearings b and having a pulley 7 V-belt transmission. The cavity of the shaft 4 soy15 dinene with a cavity (conical) distributor 8 of the material. The cavity of the distributor 8 is connected to the cavity of the grinding chamber through the holes 9. The mill has a fixed

20 housing 10 with a charging opening 11 and outlet nozzle 12, as well as a feeder 13 with a hopper 14. The conical bowl 1 has grinding bodies 15. The cantilever shaft 4 is made with a replaceable head 16.

Centrifugal ball mill works as follows.

From the drive through the belt drive and the pulley 7 spins the cantilever shaft 4 with the grinding chamber. Za3

915946

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to that of the hopper 14 by the feeder 13 through the feed openings 11 and 3, the source material is fed into the grinding chamber on the distributor 8 and further to the bottom of the bowl 1. The centrifugal forces of the material particles and the grinding bodies 5 are carried along the side surface of the bowl 1 upwards. Grinding of particles occurs due to abrasion. and impact grinding bodies. When the shaft 4 rotates with the help of the blades 5, located in its cavity, the air is forced into the cavity of the distributor 8 and through the holes 9 into the bowl. The resulting stream entrains small particles of material through the opening ^ 3 of the dome 2 into the space between the bowl 1 and the housing 10 and further into the nozzle 12. The product tonnage is regulated by the amount of air supplied, which in turn depends on the number of bowl revolutions, the type of nozzle, the lobes - tey, size of loading openings, etc.

Blowing air through the material allows you to continuously withdraw air conditioning! particles from the working area, ²⁵ which intensifies the grinding process. This design has no parts

subject to heavy wear, i.e. more durable.

Claims (2)

Claim 1. Centrifugal ball mill, including a fixed body, vertically located inside a rotating conical grinding chamber with a cantilever shaft, a dome with a hole in the upper part, characterized in that, in order to intensify grinding, increase durability, the dome is made in one piece with a conical grinding chamber and the shaft is made half-finished with blades mounted in it and connected by means of channels to the grinding chamber. 2. Mill according to claim 1, characterized in that the shaft is equipped with a replaceable expanding downward nozzle.