SU1570756A1 - Centrifugal mill - Google Patents

Abstract

This invention relates to a centrifugal mill design for grinding materials. The purpose of the invention is to increase the productivity and efficiency of grinding. The material to be ground is fed into the working chamber 4. The central shaft with the disk 9 and the ring and the hollow shaft with the ring rotates in opposite directions. Under the action of centrifugal force, the material is thrown against the walls of the disk and rings, where it is entrained in rotation by the internal ribbed surfaces of the disk and rings. The existing vertical components of the centrifugal forces cause the collision of the particles of the material, and the rotational movement of the disk and the rings ensures its active grinding. In the upper part of the chamber, a preliminary crushing of the material takes place, and in the lower part, the crushing of already crushed pieces to the required size occurs. The ground material over conical surfaces tends to exit conical slots. Once on the bevels, the material is thrown out with the help of scrapers, then enters the tray and is brought out. 1 hp f-ly, 3 ill.

Description

The invention relates to devices for grinding materials, namely centrifugal mills, and can be used for grinding ores of ferrous and non-ferrous metals, as well as other materials.

The purpose of the invention is to increase the productivity and efficiency of grinding materials.

Fig. 1 shows the centrifugal mill described above, top view, in Fig. 2, section A-A in Fig. 1,% in Fig. 3, section B-B in Fig. 1

The centrifugal mill contains a composite casing, in the lower part 1 of which is on radial spherical

two-sided roller bearings 2 and thrust ball bearings 3 have a hollow shaft 4. In the lower part 1 of the housing and the hollow shaft 4, a central shaft 8 is mounted on radial spherical two-shaft roller bearings 5, 6 and a thrust spherical roller bearing 7. Pa central shaft 8 has a cup-shaped disk 9 and ring 10. On the hollow shaft 4 there is a fixed ring 11. It is possible to install several rings on the hollow shaft. A ring 13 is attached to the upper part 12 of the housing. The disk 9 and the rings 10, 11 and 13 form a working chamber 14. The internal surfaces of the disk

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The cage and ring are ribbed. The hollow shaft A is driven by the motor 15 through bevel gears 16, 17 and the spur gears 18, 19. The central shaft is driven by the motor 20 through the bevel gears 21, 22 and spur gears 23, 24 in the direction opposite to the direction of rotation of the hollow shaft 4. In this case, the bevel gears 25, 26 are removable and attached to the composite body 1 by bolts 27, 28. Between the gear wheel 19 mounted on the hollow shaft 4S and the lower part 1 of the housing 1, a thrust bearing 29 is installed, and between the gear wheel 24 mounted on the central shaft 8 and the end surface 30 of the hollow shaft 4 there is a thrust bearing 31. Seals 32 are installed between the hollow shaft 4 and the bottom 1 of the housing 33 the hollow shaft 4 is attached scrapers 34. The hollow shaft 4 is provided with discharge openings 35. Between the disk 9 and the end surface 36 of the hollow shaft 4, seals 37 are installed, and scrapers 38 are attached to the disk 9. The disk 9 and the ring 11 rotate in opposite directions over the top The cone 39 of the disk 9 and the surface 40 of the ring 11, forming between themselves a discharge ring slit 41, are made conical. The rings 10 and 11 rotate in opposite directions, with the surface 42 of the ring 10 and the surface 43 of the ring 11 forming between

discharge ring slit 44, made conical. The surface 45 of the fixed ring 13 and the surface 46 of the rotating ring 10 are made conical and form an unloading annular gap 47 between them. In this case, the conical surfaces 39, 43, 46, which are slit to the axis of rotation of the disk 9 and the rings 11, 10, are provided with annular grooves 48 - 50 and have outside bevels 51-53. Material is loaded into the mill through a funnel 54. The upper part 12 of the housing is provided with a discharge opening 55 through which the crushed material is poured into the tray 56 rigidly fixed to the casing 12.

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Centrifugal mill works as follows.

After starting the mill at a predetermined rotational speed, the source material is fed through the funnel 54 into the working chamber 14, with a size of approximately 100-300 mm. At the same time, the central shaft 8 with the disk 9 and the ring 10 and the hollow shaft 4 with the ring 11 rotate in opposite directions. The hollow shaft is driven by the motor 15 through bevel gears 16, 17 and spur gears 18, 19. The central shaft 8 is driven by the motor 20 through bevel gear wheels 21, 22 and spur gears 23, 24. in order to facilitate assembly and increase maintainability of the centrifugal mill, bevel gears 25, 26 are removable. Getting into the working chamber 14, as the chamber is filled, the material under the action of centrifugal force is thrown to the walls of the disk 9 and the rings 11 10, where it is entrained in the rotation by the internal ribbed surfaces of the disks. In this case, a protective layer in the form of a packing of material is formed on the inner ribbed surfaces of the disks, which protects the disk 9 and the rings 10, 11, 13 from wear. Under the action of the vertical components of the centrifugal forces, the particles of the material collide, and under the action of the rotational movement of the disk 9 and the rings 10, 11, which entices the loaded material in opposite directions, its active grinding takes place. In this case, in the upper part of the working chamber 14, the initial material is mainly pre-crushed, and in the lower part of the chamber, the already crushed pieces of material are basically crushed to the required value. The crushed material, having reached the required dimensions, under the action of centrifugal force and its vertical component, falls into the discharge conical slots 41, 449 47. At the same time, due to the ability of smaller grains of the crushed material to spill down between the large grains of material, highest, and the performance of the upper slit - the lowest. On

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The conical surfaces 40, 42 of the grains of the crushed material will have a different centrifugal force, which is known, in direct dependence on the diameter of the disk and the rings. Therefore, as they exit from the conical slits 41, 44, they will tend to tear off from the conical surfaces 40, 42 as quickly as possible. At the same time, the grains of the crushed material fall on the conical surfaces 39, 43, 46 of the disk 9 and the rings 11, 10. But their surfaces are made with annular grooves 48-50, in which a gasket is formed from the ground material and a natural protective layer is created, thus significantly reducing the wear of the conical slots 41, 44, 47. The grains of the crushed material under the action of the vertical component th centrifuge forces tend by conical surfaces 39, 43, 46 to the exit slots 41, 44, 47; from the crushed material along the edges of the conical surfaces 39, 43, 46, bevels 51-53 are made, as it were, extending the discharge conical slots 41, 44 47 to the exit. While the thrust bearings 29, 31 perceive the axial load arising from the grinding of the material in the working chamber 14., which can move the hollow shaft 4 and the central shaft 8 upwards. Then the crushed material, hitting the bevel

51, is thrown out, with the help of scrapers 38 and centrifugal forces is introduced through the discharge openings 35, then together with the crushed material that falls on the bevels

52.53, by means of scrapers 34, through the discharge opening 55 in the casing 12 enters the tray 56 and the ich mills are removed. In this way, seals 32 and 37 prevent the bearing assemblies from becoming contaminated.

The use in the centrifugal mill of disks and several rings rotating in opposite directions and the upper fixed disk allows pre-crushing of the starting material being crushed in the upper part of the chamber.

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both by rings, by means of CAME grinding, and in the lower part of the chamber, the already crushed pieces of material are ground to the required size, after which the ground material leaves through discharge gaps, moreover, due to the capacity of smaller JQ grains of ground material. Waking down, the bottom discharge gap has a capacity higher than the upper ones.

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Claims (2)

1. A centrifugal mill containing a body with loading and unloading openings, a cup-shaped disk and a ring located above it, made with a ribbed inner surface and mounted in the body, respectively, on rotating double sides by cent and floor rotary shafts with the formation of an annular discharge gap between them, and shaft drives, which, in order to increase the productivity and efficiency of grinding materials, it is equipped with additional rings installed with the formation of annular discharge slots, made similarly to the main ring and located above it alternately on the central and hollow shafts, with the central shaft mounted inside the hollow shaft, and the upper additional ring mounted on the housing. 2. Mill according to claim 1, about tl and h a - y and a so that the drive of each shaft is made in the form of a two-stage transmission, the first stage of which has toothed bevel gears, and the second - cylindrical gears, one of which is installed on the corresponding shaft, the cylindrical gear mounted on the hollow shaft is supported on the housing, and the cylindrical gear mounted on the central shaft is mounted on the hollow shaft with the help of thrust bearings. and. 95 / OiSl Fig