SU1741889A1 - Centrifugal mill - Google Patents

Abstract

Use: equipment for grinding carbon-graphite materials limestone. SUMMARY OF THE INVENTION: A centrifugal mill consists of a vertically arranged cylindrical body 1 with a shaft 2. on which a bowl-shaped rotor 3 with a removable ring 4 is fixed. A removable ring 4 is coupled to the working surface of the bowl-shaped rotor 3 with an inclined wavy surface in the circumferential direction. The adjusting ring 8 from the side of the annular cavity, is made with an inclined smooth surface. Both rings 4 and 8 form in the circumferential direction a series of crushing and unloading cavities, which end in a radial direction with an unloading gap. The taper in the lower part of the removable ring coincides with the taper of the bowl-shaped rotor, and at the top - more. The surface of the adjusting ring is made in the form of a reverse cone. 1 hp f-ly. 3 il. W YO XJ 00 SO

Description

The invention relates to grinding equipment, mainly for grinding carbon-graphite materials and limestone, to produce coarse fractions.

The aim of the invention is to increase the productivity and quality of the final product by reducing overgrinding.

Fig. 1 shows a centrifugal mill, general view, section; figure 2 - section aa in figure 1; fig.Z - node in figure 1.

The centrifugal mill consists of a vertically arranged cylindrical body 1 with shaft 2 coaxially mounted in it. On which is mounted a cup-shaped rotor 3 with a removable ring 4. In the upper part of the shaft 2, a belt-drive pulley 5 is attached. The rotor shaft 2, in turn, is mounted in bearing supports: the upper 6 and lower 7. The adjusting ring 8 is mounted on three screw jacks 9, which are attached to the housing 1 by means of the brackets 10 and are installed evenly through 120 °. The upper bearing 6 is supported on the yoke 11, the lower bearing 7 on the yoke 12. In the lower part of the housing 1 there is a discharge chute 13, in the upper part there is a loading nozzle 14. The mill is driven from the electric motor via a V-belt drive (not shown). The rotor bowl 3 has the shape of an inverted hollow-truncated cone, inside which six vertical radial ribs 15 are installed uniformly.

Removable ring 4, mating with the working surface of the cup-shaped rotor 3 with an inclined wavy surface in the circumferential direction. The taper of the lower mating surface of the removable ring 4 coincides with the taper of the bowl of the rotor 3, while the taper of the upper mating surface of the removable ring 4 is greater than the taper of the lower mating surface. The adjusting ring 8 on the side of the annular cavity is made as an inverse cone. Thus, both rings, the adjustment and removable in the circumferential direction form a series of crushing cavities 16 and unloading cavities 17, which end in the radial direction with the discharge gap 18.

Centrifugal mill works as follows.

The source material is evenly fed through the loading nozzle 14. For the operation of the mill in optimal conditions

It is necessary to have a layer of material above the bowl 3 equal to 1.0–2 m. When the rotor rotates, the material accelerates the radial ribs 15 to a speed of 10–15 m / s and throws it out of the bowl 3 into the active self-grinding zone, which is above the bowl 3. Particles of material which are commensurate with the size of the calibration discharge gap, under the action of centrifugal

0, forces are ejected from the mill and fall onto the discharge chute 13. Large material particles return to the bowl 3, and the cycle repeats. Rolled material particles, which are ineffectively crushed, in the active self-grinding zone under the action of centrifugal force fall into the crushing cavities 16, which are formed between the removable ring 4 and the adjusting 8. After crushing in the cavity 16

0 material passes into the cavity 17 and under the action of centrifugal force into the calibration. discharge gap 18. The angle between the removable ring 4 and the adjustment 8 should be in the range of 15-25 °. When the angle is turned off, an effective capture of rounded pieces of material occurs and they are crushed in cavity 16 due to the wave-like surface of the ring 4. The angle value depends on the coefficient of material friction on the cavity cavities. At low friction coefficients, the lower limit of the angle of 15 ° C is assumed. At maximum friction coefficient values, the upper limit of the angle is 25 °. With increasing angle

5, the volume of the cavities 16 increases, therefore a larger number of rounded pieces of critical sizes can be destroyed.

The inclined, wavy surface of the removable ring 4 at the interface with the working surface of the bowl has an angle of 20 °, the value of which decreases and at the place of transition of the wavy surface into the calibration discharge gap 18

5 is equal to 0. In the case of a change in the size (finished product) of the crushed material, it is necessary to change (decrease or increase) the size of the calibration discharge gap 18 with the help of screw

0 jacks 9 that locate the adjustment ring 8 above the removable ring 4,

The use of the invention allows 5 to combine in one machine the process of auto-grinding with the addition of pasting particles in the annular gap, which increases productivity and improves the quality of the final product by reducing over-grinding.

Claims (2)

Claim 1. A centrifugal mill comprising a vertical housing with a coaxially mounted shaft, a bowl-shaped rotor mounted on the shaft with a removable ring on its upper part, the internal cavity of which is divided into sections by means of vertical radial partitions, an adjusting ring fixed in the housing above the rotor and forming a horizontal annular discharge slit with a removable ring, and a drive characterized in that, in order to increase the productivity and quality of the final product by reducing ereizmelche0 five R & D, the inner surface of the adjusting ring is made in the form of a reverse cone, and the removable ring is made with an internal inclined wavy in the circumferential direction surface adjacent to the working surface of the bowl-shaped rotor, and the taper in the lower part of the removable ring coincides with the taper of the bowl-shaped rotor, and the taper in the upper part is larger than the taper of the lower mating surface. 2. Mill pop-1, characterized in that the adjusting ring is adapted to move in the axial direction. but FIG. 3