SU1369789A1 - Mill for superfine grinding - Google Patents

Abstract

The mill refers to machines for ultrafine grinding of dry bulk materials. The purpose of the invention is to increase the efficiency of the grinding process. The disks 18, 19, 20 of shaft 17 have additional percussion elements in the form of beats of 21 rectangular shapes. On disks 4, 5, 6, rectangular vanes are mounted radially and at an angle in concentric rows. Such an arrangement and the shape of the blades make it possible to obtain at the output of the shredder a uniform product of improved grain composition and to increase productivity by 3 times. 1 hp f-ly. 5 il. (L

Description

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The invention relates to machines for fine grinding of dry bulk materials and can be used in the chemical, pharmaceutical, food and other industries.

The aim of the invention is to increase the efficiency of the grinding process.

The nipple nozzle 16. Thus, the mill creates a stream of air to transport material through all the chambers.

The source material through the loading nozzle 14 enters the chamber 1 and moves in a stream of intake air between partition A and

Figure 1 shows the mill, razi IQ disk 18, held in the radial naprez; . figure 2 - node I in Fig, 1; on fig.Z - section aa in figure 2; figure 4 - node II in figure 1; on fig.Z - section bb in figure 4.

The mill (Fig. 1) contains a housing consisting of separate chambers 1,2 and 3, on flat partitions 4,5, and 6 of which are reinforced by working members - lamellar swirlers 7 and 8. Chambers 1, 2 and 3 are equipped with jackets 9, 10 and 11 for cooling the product and reflective strips 12 and 13, made of a trapezoidal shape and set at an angle to the direction of movement of the material. To load the source material, to cool the water and to discharge the finished product, there are respectively nozzles 14, 15 and 16. Disks 18, 19 and 20 are fixed on the drive shaft 17, on the end planes of which there are working members 7 and 8, discs 18, 19 and 20 have a bilge 21 mounted radially on the lateral surface and made rectangular in shape.

On the reverse non-working surface of the disk 18 there are radially concentric rows in the form of rectangular plates of the blades 22, between which are placed the blades 23 located on the partition 5, the ratio of the thickness of the blades to the step between them is 0.35-0.4, on the non-working surfaces The disk 19 is reinforced with concentric rows of wedge projections 24 in which the blades 25 are located, the projections 24 and the blades 25 forming zigzag channels with the projections 26 and the blades 27 of the partition 6. The height of the working part of the wedge projection is 0.4-0.6 the length of the scapula.

The mill works as follows.

When the shaft rotates at a high angular velocity, the working bodies create a ventilation effect. The air is sucked through the nozzle 14, passes all the chambers and passes through the gilding through the rows of working bodies / 7, where it is preliminarily crushed and thrown onto the strips 12, then picked up by the beels 21 and again repeatedly crushed. When moving to the next chamber 2, the material flow is directed through a system of vanes 22 and 23, where it is preliminarily classified and through a flow-through opening.

enters chamber 2. In this grinding zone, due to the wedge protrusions, the material moves between the partition 5 and the disk 19 in both the radial and axial directions and

is again dropped onto the slats 12,; interact with bilami.

When moving into the chamber 3, the material flow passes radially between the disk 19 and the partition 6 through zigzag gaps formed by the protrusions 24 and 26 and the vanes 23. and 27. Particles with a mass below the limit value air flow are removed i the next chamber 3. Particles with a mass boundary values and more are discarded for re-crushing by blades of a fixed partition and a wedge projection, and trapped projections and blades that fall into the zone of action pass through zigzag channels and are additionally destroyed in rotating vortices vanes 25 and enter the chamber 3. Finally, the crushed material, after passing the chamber 3, vynosits air through unloading port 16.

Claims (2)

1. Mill for ultrafine grinding of bulk materials containing storing the case, divided into working chambers by vertical partitions with coaxial central holes, a horizontal shaft with disks located in the chambers, lamellar coolers fixed by radially concentric rows on the corresponding opposite surfaces of partitions and disks, punched in the form of plates mounted radially on the side disk surfaces, reflective strips mounted on the housing and located obliquely with respect to the direction of movement of the noTi material current, characterized in that In order to improve the efficiency of the grinding process, on the back side of the disk of the first chamber there are mounted radially concentric rows of blades between which are placed analogs of the 1st row of blades the current is fixed on the partition, the blades of the first chamber are made in the form of rectangular plates, the ratio of the thickness to their pitch is 0.35-0.4, the blades in the second chamber are also made in the form of rectangular plates and fixed on the reverse side of the disk and a partition using wedge lugs, the height of the working part of which is 0.4-0.6 times the length of the blade, while the wedge juts with blades are arranged in concentric rows, and the rows of blades on the disk are located between the rows of blades on the partition; disk lop heel of one row are offset relative to another row of blades on the i-half pitch between the blades, 2. Mill according to claim 1, characterized in that the reflective strips have a trapezoidal section. yy phi.1 b FIG. four /14  FIG. five 0i / S.ff