SU1711966A1 - Centrifugal ball mill - Google Patents

Description

The invention relates to a device for fine grinding bulk materials and can be used in mining, construction, chemical and other industries.

The purpose of the invention is to increase the grinding efficiency.

The drawing shows a centrifugal ball mill, General view, section.

The centrifugal ball mill comprises a housing 1 on which a loading nozzle 2 and an unloading nozzle 3 are attached. In the housing 1, a three-stage chamber 5 is mounted rotatably with a cantilever shaft 4, forming a grinding chamber 6 together with the housing 1.

The chamber 5 through channels 7 is connected with the cavity of the shaft 4. The bottom 8 of the housing 1 is made with an inclination towards the axis of rotation, and its peripheral part is provided with an annular convex chipper 9. Each stage of the chamber 5 is made in the form of truncated cones 10, oriented with their large bases upward, and the angle between the generatrix of the surface of the middle stage 11 and the vertical is greater than the same angle for the lower stage 12 of the chamber 5. Moreover, each stage, with the exception of the middle one, is provided on the inside with accelerating blades 13 oriented to the For forming the surface of the step, and in the middle step 11 there are side openings

14.

Centrifugal ball mill operates as follows.

The material to be crushed through the loading nozzle 2 falls to the bottom of the rotating chamber 5 filled with metal balls 15. From the lower stage 12, the crushed material and balls 15 captured by the accelerating blades 13, under the action of centrifugal forces, fall on the upper stage of the chamber 5, without interacting with the middle step, as it has a larger angle. At the third stage, the material and balls are further advanced to the upper peripheral part of the grinding chamber 6. Here, the primary destruction of the material occurs as a result of a collision with the upper part of the body. Then, under the action of gravity, the balls and material freely fall onto the chipper 9, while further grinding of the material occurs. Partially crushed material and balls along an inclined bottom 8 flow through holes 14 into a chamber 5, where the next grinding cycle begins. The finished pulverulent fraction is carried away through the outlet pipe 3 with the help of the air flow coming from the hollow shaft 4 through the channels 7.

The fineness of the finished product is controlled by the speed of the air flow entering the grinding chamber 6.

The proposed design of the mill allows to accelerate the circulation of the material in the grinding chamber, and the chipper located in the peripheral part of the bottom eliminates a large accumulation of material and balls at the time of destruction, which ultimately leads to an increase in the efficiency of the grinding process.

Claims (2)

Claim 1. A centrifugal ball mill containing a housing, a vertically rotating chamber inside it with a cantilever hollow shaft connected by channels to the chamber, characterized in that, in order to increase grinding efficiency, the chamber is three-stage and forms a grinding chamber together with the housing, the bottom of the body is inclined to the axis of rotation of the shaft, ι and its peripheral part is equipped with an annular] fender. 2. The mill according to claim 1, characterized in that each stage of the chamber is made in the form of truncated inverse cones, and the angle between the generatrix of the surface of the middle stage and the vertical is larger than the same angle of the lower stage of the chamber, with each stage, except the middle, provided from the inside, booster blades located along the steps forming the surface of the step, and side holes are made in the middle step.