RU2553240C1 - Ball mill - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: mill comprises loading (1) and unloading (2) devices, grinding balls (9) and a shaft (3) with disks (5). A hollow drum (4) is mounted on the shaft. The disks are installed on the shaft and divide the drum into sections. The disks can be moved along the shaft axis. The diameter of the disks increases from the loading device to the unloading device. A round port (6) for material loading is provided in the end face surface of the first drum section. The last drum section is fitted by ports to unload the ready product (7). Decrease of the gap between the drum surface and the disk ends allows for section-by-section grinding of material.

EFFECT: invention has simple design and ensures grinding of high quality.

1 dwg

Description

The present invention is intended for use in the chemical industry, agriculture, the production of building materials and other industries.

Known ball mill [RF Patent No. 2320416], consisting of a loading and unloading device, a cylindrical body, lined with wear-resistant elements from the inside, an interchamber partition dividing the inner space of the mill into coarse and fine grinding cameras and rigidly fixed to the housing. Inside the cylindrical body, a device is arranged coaxially for returning the material to the fine grinding chamber.

The disadvantages of this mill include the complexity of the design, the low quality of grinding, as well as the inability to control the degree of grinding.

Closest to the proposed invention is a ball mill BM 500 [http://www.ib-eng.ru/bm500n.html], containing loading and unloading devices, grinding bodies (balls), a shaft on which a hollow drum is mounted. On the shaft there are discs dividing the drum into sections.

The disadvantages of this mill are also the complexity of the design, the low quality of grinding, as well as the inability to control the degree of grinding.

The objective of the invention is the creation of a ball mill of a relatively simple design and allows to obtain high quality grinding.

The problem is achieved in that in a ball mill containing loading and unloading devices, grinding bodies (balls), a shaft on which a hollow drum is mounted, disks are placed on the shaft that divide the drum into sections, disks are mounted for movement along the shaft axis, and their diameter increases from the loading device to the unloading device, and in the first section an annular window for loading material is made in the end surface of the drum, and in the last there are openings for unloading the finished product.

Figure 1 presents a diagram of a ball mill.

The ball mill contains loading devices 1 and unloading 2, a shaft 3, on which a hollow drum 4 is mounted. Disks 5 are mounted on the shaft, dividing the internal volume of the drum into sections. In the first section, an annular window 6 is made in the end surface of the drum, and in the last there are openings for unloading the finished product 7. The drum is driven by an electric motor 8. Balls 9 are used as grinding bodies.

Ball mill works as follows.

The material to be ground is fed from the loading device 1 through an annular window 6 to the first section of the rotating hollow drum 4. Here the initial (rough) grinding of the material takes place. The material crushed to the required size passes in the gap between the wall of the housing and the disk 5 and enters the second section. At the same time, grinding bodies and unmilled material remain in the first section. In the second zone, the next grinding stage takes place - to smaller particles. The crushed particles through the gap enter the next section, where the process is repeated. The finished product through the holes for unloading the finished product 7, located in the last section, is fed into the unloading device 3.

Due to the fact that the disks are installed with the ability to control the distance between them (moving along the shaft), it becomes possible to adjust the size and volume of the sections, which is necessary for multi-stage grinding.

The number of sections, the size of the disks and the distance between the disks depend on the required degree of grinding and physical and mechanical characteristics of the material being ground.

For the directional movement of material from the first section to the discharge device, the drum is made inclined.

Due to the fact that the diameter of the disks increases from the loading device to the unloading device, there is a decrease in the gap between the surface of the drum and the end of the disks, which allows for the gradual (sectional) grinding of the material.

The proposed ball mill has a simple design and high grinding efficiency.

Claims (1)

A ball mill containing loading and unloading devices, grinding ball bodies, a shaft on which a hollow drum is mounted, disks are arranged on the shaft to divide the drum into sections, characterized in that the disks are mounted for movement along the shaft axis, and their diameter increases from loading device to the unloading device, and in the first section, an annular window for loading material is made in the end surface of the drum, and in the last section there are openings for unloading the finished product.