SU1711970A1 - Ball mill - Google Patents

Abstract

This invention relates to a fine grinding technique and can be used in the paint industry and other traditional household braces. The purpose of the invention is to increase productivity and improve the quality of the finished product. In a bead mill, a disk 3 is mounted on the drive shaft 2, on which a cylindrical shell 4 is fixed. It is equipped with an internal helical spiral 7 directed oppositely to the external spiral spiral 6. The internal spiral spiral is larger than the external spiral spiral, which contributes to uniform distribution of the grinding bodies 8 along the the entire volume of the camera. The grinded mass, together with the liquid component, is supplied by the pump to the choke 9 through the grid 10 and, the passage between the bodies, fills the free volume of the bead mill. 1 il.

Description

The invention relates to the technique of fine grinding and can be used in the paint industry, chemical and other sectors of the national economy.

The aim of the invention is to increase productivity and improve the quality of the finished product by enhancing the circulation movement of the grinding bodies in the mill.

The drawing shows a bead mill.

The bead mill contains a vertical cylindrical body 1, closed with a lid on top. On the drive shaft 2 inside the housing 1 there is a disk 3 on which a cylindrical shell 4 is fixed, in the upper part of which windows 5 are located, on the outer surface of the screw helix 6, and on the inside

the surface is a screw helix 7. The direction of the helical helix 7 is opposite to the direction of the helix helix 6, and the pitch is larger than that of helix 6. Inside the body 1 is filled with ball milling tors 8. In the bottom of the body 1 there is a nozzle 9 and a mesh 10 that serve for injecting a suspension of coarsely ground material. Coarse grinding to particle sizes at which they freely pass through the grid 10 is a preparatory operation before fine grinding. The means for removing the crushed product is the net 11 and the choke 12. For removing excess heat, the body 1 can be cooled.

Bead mill works as follows.

The prepared ground mass, together with the liquid component, is pumped into the nozzle 9 of the mill, through the mesh 10, the passage between the grinding bodies 8 (solid balls), fills the entire free volume of the bead mill. Shaft 2 drives a disk 3 with a cylindrical shell 4. The balls 8 together with the mixture are raised by a helical spiral 7. Under the action of centrifugal forces, the grinding bodies 8 pass through the windows 5 in the cylindrical shell 4 and enter the zone of action of the spiral 6.

With a spiral coil, the grinding balls 8 with the mixture are distilled down. The difference between the steps of the inner helix 7 and the outer helix 6 increases the uniform distribution of the grinding bodies in the housing 1. As the balls 8 under the action of their own weight are lowered, then, if the steps are equal, the spiral spirals b and 7 would have a greater concentration of balls 8 in the lower part of the housing 1 compared with its upper part. In order to increase the uniform distribution of the balls 8 throughout the chamber volume, the pitch of the helix lifting the balls up is large. than a spiral that is moving the balls down. With intensive circulation movement of the grinding bodies 8 together with the mixture, the substance is crushed by the grinding bodies 8 and by self-grinding of the particles together. Intensive circulation movement of the balls 8 with their uniform distribution over the volume of the ground mass will ensure high quality of the product at high

performance. The finished product is withdrawn through the grid 11 and the fitting 12.

The technical and economic advantages of the proposed mill as compared to the prototype consist in increasing the productivity and improving the quality of the finished product due to an increase in the circulation motion of the grinding bodies in the mill with their more uniform distribution by volume.

Claims (1)

An inventive bead mill comprising a cylindrical body with means for loading comminuted materials and the unloading of the finished product, the shell placed in it with the outer helical coil and the internal grinding elements, connected by means of a disk with the drive shaft, and the grinding load, This is due to the fact that, in order to increase production and improve the quality of the finished product, the grinding elements are made in the form of a helical spiral directed opposite to outer helix, with a pitch, large pitch outer helix.