RU2560993C1 - Ball mill - Google Patents

Abstract

FIELD: agriculture.

SUBSTANCE: mill comprises a loading (1) and an unloading (2) devices. On the drive shaft (3) a working chamber is mounted in the form of coaxially arranged spirals (4). The spirals have opposite coiling. The channel for pouring the material (5) from one spiral to another in a certain section has a zone with holes (7) for selecting the crushed material. In the inner space of the spirals there are grinding balls (6). In the zone of the unloading device the side surfaces of the spirals are attached to the conical chambers (8). One of the chambers has holes (10) on the side surface and communicates through the branch pipe (11) with the loading device. For directing the material to the unloading device the inclined trays (13, 14) are mounted under the working chamber.

EFFECT: invention has a simplified structure and ensures a high degree of grinding.

2 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 2021021], containing loading and unloading devices, a hollow drum with spiral guides on the inner surface, made in the form of protrusions and depressions. The protrusions and depressions are placed on the drum so that their longitudinal generatrix is installed at an angle of 15-23 ° to the generatrix of the cylindrical surface of the drum. The protrusions and depressions have a width and depth equal to 0.6-0.7 of the average diameter of the grinding step.

The disadvantages of this mill are the complexity of the design and the low degree of grinding.

Closest to the proposed invention by design features is a mixer-seed pellet mill [AS USSR No. 1817970]. The mixer-drier contains loading and unloading devices, a drive shaft on which a working chamber is mounted, made in the form of coaxially arranged spirals having opposite windings, and a channel for transferring material from one spiral to another. Despite the fact that this mixer-dredger is not intended for grinding processes, it has structural similarities with the invention.

The disadvantage of this device is the design complexity.

The objective of the invention is the creation of a ball mill of less complex design and with a high degree of grinding.

The task is achieved in that in a ball mill containing loading and unloading devices, a drive shaft on which a working chamber is mounted made in the form of coaxially arranged spirals having opposite winding and a channel for transferring material from one spiral to another in the internal volume of the spirals grinding bodies (balls) are placed, the channel for pouring has in some area a zone with holes for the selection of crushed material, and in the area of the discharge device to the side surfaces of the spirals are attached to onic chambers, one of which has openings on the side surface and communicates through a nozzle with a loading device, and inclined trays are installed under the working chamber to direct the material to the unloading device.

Figure 1 presents a diagram of a ball mill.

Figure 2 shows a view A.

The ball mill contains loading devices 1 and unloading 2, a drive shaft 3, on which a working chamber is mounted, made in the form of coaxially arranged spirals 4 having opposite windings. Spirals communicate with each other through a channel for pouring material 5. Grinding bodies (balls) 6 are placed in the internal volume of the spirals 4 (not shown in FIG. 1 and 2). On the surface of the channel for pouring 5 holes 7 are made, which serve to select the crushed material. In the area of the loading and unloading devices, conical chambers 8 and 9 are attached to the lateral surfaces of the spirals 4, one of which has openings 10 on the lateral surface and communicates through a pipe 11 passing through the center of the spirals 4 with the conical chamber 9. For directing the material to the unloading device 2, inclined trays 13 and 14 are installed under the working chamber. The working chamber is driven from the electric motor 12.

Ball mill works as follows.

The material to be crushed is fed from the loading device 1 into the internal cavity of the conical chamber 9, from where it enters the first spiral with grinding media. During the rotation of the working chamber, the material to be ground with grinding media moves from the central part of the spiral to the lower one, while it is ground. Having reached the channel 5 connecting the entrances to the spirals, the crushed particles are sifted through the holes 7 and through the inclined tray 14 enter the unloading device, and the grinding media and the under-crushed particles are sent to the second spiral, which is wound in the opposite direction. Here the material moves in the opposite direction - from the bottom to the center, accompanied by further grinding. Having reached the conical chamber 8, the crushed product is sifted through the openings 10 and moves along the inclined tray 13 to the discharge device. Grinding bodies and large particles are sent through the pipe 11 to the conical chamber 9, where material from the loading device 1 is continuously supplied.

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

Claims (1)

A ball mill containing loading and unloading devices, a drive shaft on which a working chamber is mounted, made in the form of coaxially arranged spirals having opposite windings, and a channel for transferring material from one spiral to another, characterized in that grinding media are placed in the internal volume of the spirals body-balls, the channel for pouring over has in some area a zone with holes for the selection of crushed material, and in the zone of the discharge device conical chambers are attached to the side surfaces of the spirals, one of which has openings on the side surface and communicates via a pipe with the loading device, and for guiding the material to an apparatus for discharging working chamber mounted inclined trays.

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