SU1209285A1 - Centrifugal mill - Google Patents

Description

The invention relates to devices for the dry grinding of materials and can be applied in the mining, construction, fuel and chemical and chemical industries.

The purpose of the invention is to increase the efficiency of the dry grinding process, reliability and economy of operation.

The drawing shows the proposed centrifugal mill, a general view.

The mill consists of a housing 1, made of wear-resistant material, a clamping hollow truncated cone 2 with discharge openings 3, clamps 4 with a fender conical ring 5 and a branch pipe 6.

The lid 4 and the hollow truncated cone 2 are attached to the body through the gaskets 7. The collar 4 is mounted for movement along the axis of the pipe 8 with an automated drive 9 (which can be performed, for example, using a pneumodragm) and a stopper 10. Cone-shaped bowl II made of wear-resistant material, mounted on a vertical shaft 12, which is mounted in the housing 1 on the bearings 1 for rotation from the drive through a V-belt or other gear 14. Hatches 15 are provided in the lower part of the housing. Working surface hollow truncated cone 2 is inclined to the working surface of the cone-shaped bowl at an angle of 15-60 °.

The mill works as follows.

When the cone-shaped bowl 11 is rotated and the balls and material are fed through the loading tube 8, the balls are thrown by centrifugal force onto the walls of the cone-shaped bowl, are lifted up to the stop into the hollow truncated cone 2, placed in a narrowing working space, according to their size, and make planetary movement between the working surfaces : rotation about its center and running around a hollow truncated cone 2.

The grinding force is generated by the centrifugal force that occurs when the balls are rolled. Crushed material, raising the sloping wall of the cone-shaped bowl

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1I, crushed and abraded by the balls.

The unloading of the finished grinding product and the return of the coarse fraction to the final grinding in the mill is carried out with the help of a pneumatic classifier formed in a confined space between the hollow truncated cone 2 and the crush: - 4.

When air is sucked from the pipe 6, air is sucked through the loading pipe 8, passes through the working space between the hollow truncated cone 2 and the conical bowl 11, picks up the crushed material and through the discharge openings

3 passes inside the hollow truncated cone 2.

As a result, a sharp drop in speed in the closed volume of the mezkda hollow truncated cone 2 and the lid

4 and hitting the breaker ring 5 large particles fall on the inner surface of a hollow truncated cone 2. During periodic lifting

the tubes 8 are driven by a drive 9; the precipitated particles fall onto a rotating cone-shaped bowl 11 and undergo a repeated grinding cycle.

The return of the crushed particles to the chopping can be carried out continuously, for which the pipe 8 is raised above the hollow truncated cone 2 and fixed in the desired position by the stopper 10. The deposited coarse material falls through the resulting gap into the cone-shaped bowl 11 and leaves. One way or another of unloading the pneumatic classifier is selected from the conditions of expediency when constructing the installation.

The finished product is sucked through: through pipe 6 and discharged into 1 ;. in bulk. dust extraction installations consisting of cyclones, bag filters or other elements (not: shown).

Adjusting the dimensions of the mill working space and compensating for the wear of the cone-shaped bowl and the hollow truncated cone are made by changing the shims 7. Worn balls come out of the working space, are thrown into the mill body and removed through the hatch 15.

Replacing srednekhodnoy ball mill0

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faces with a ring diameter of 1000 mm

3J2092854

The proposed same size of the provision of specific consumption of balls by 307 ,, complies with an increase in productivity — the shortening of downtime for the replacement of balls of a type mill with a factor of 2.5, a decrease of a 576 hours per year.

Claims (2)

T37) 1. CENTRIFUGAL MILL, comprising a housing with a lid, a grinding chamber in the form of a cone-shaped bowl having discharge openings, in which a height-adjustable pressure truncated cone is installed, directed downward by a smaller base, the working surface of which is inclined to the working surface of the bowl by an angle of 15-60 °, and also installed with the possibility of axial movement of the vertical feed channel and grinding balls, characterized in that, in order to increase the efficiency of the dry process>. Grinding, reliability and efficiency In operation, the truncated cone is made hollow, and the discharge holes are located in its upper part above the upper edge of the bowl at a distance of not less than Q meter of the smallest ball. 2. The mill according to p. I, characterized in that it is equipped with a jack conical ring, which is located on the inner side of the lid opposite the discharge openings.