RU2647897C1 - Vortex segment mill - Google Patents

Abstract

FIELD: separating, mixing.

SUBSTANCE: invention relates to devices for grinding of materials and can find use in construction, chemical, mining, as well as other industries. Mill comprises a rotor 3 and a stator 2, which surfaces face one another, wherein in order to provide grinding of the material, at least one of the surfaces is formed from segments with recesses. Segments with recesses can form rings. Rings or segments of rings can be made of sheet material and connected by bolts 9.

EFFECT: mill allows to perform multistage grinding of materials.

4 cl, 12 dwg

Description

The invention relates to devices for grinding various materials and may find application in the construction, chemical, mining, as well as other industries.

Known vortex mill according to patent EP 0122608, publ. 1984 The vortex mill contains two rotors for coarse and fine grinding successively placed on one shaft. The coarse rotor contains cylindrical supporting elements fixed to the sleeve. Grinding elements in the form of vertically arranged plates are installed in the radial grooves of the supporting elements and secured to them with the help of discs separating the rows of supporting elements and covering them from above and below. The grinding elements of the stator are tabs fixed on the inside of the housing with a rectangular profile in cross section. The rows of tabs are divided vertically by rings partially overlapping the grooves of the grinding elements. The rotor for finer grinding contains grinding elements, which are tabs with a rectangular profile in cross section. The grinding elements of the stator are tabs with a triangular profile in cross section. The rows of grinding elements of the stator are also separated from each other by horizontal partitions, partially overlapping grooves in the grinding elements. The channels formed by the grinding elements of the rotor and stator allow for a more frequent collision of particles with grinding elements.

The disadvantages of the known mill are the complexity of the design, the inconvenience of the mill with several (exceeding two) stages of processing the material with different grinding characteristics, from coarse to thin, the need to change the grinding elements as a whole, and not just worn sections.

Closest to the invention is a vortex mill according to the patent of the Russian Federation No. 2562542, publ. 2014, which contains the rotor, stator, grinding elements mounted with the possibility of radial movement, the rotor and stator are assembled from flat rings made of sheet steel, recesses are made in the edges of a larger number of flat rings, alternating with slots. The recesses and slots in the rings form grooves on the rotor and stator surfaces facing each other. In the grooves formed by the slots, grinding elements in the form of plates are placed.

A disadvantage of the known mill is the complexity of its design due to the presence of separate grinding elements in it, which also severely limit the number of manufacturing options for vortex pockets (grooves formed from recesses in flat rings) and make it impossible to produce several different grinding stages in one mill the gap between the rotor and the stator, as well as the geometry of the vortex pockets / working surfaces of the rotor and stator.

The technical result of the invention is to simplify the design of a vortex mill, increase the manufacturability of its manufacture, providing multi-stage and having different characteristics in different stages of grinding in one device.

The technical result is achieved in a mill (hereinafter, the terms “vortex mill”, “vortex segment mill” are also used), containing a rotor and a stator, rotor and stator surfaces facing each other ensure grinding of the material in that at least one of the surfaces formed from recessed segments. The recessed segments form rings (rotor or stator rings). Rings or ring segments are made of sheet material (metal). Rings and ring segments are bolted together. The grooves formed by the recesses in the segments are axially divided by at least one ring, or by segments that form a ring that do not contain recesses. The length of the grooves formed by the recesses in the rings, or the segments forming the rings, rotor and stator, is easy to vary, since it is determined by the number of rings with recesses. The number of delay stages is determined by the number of rings, or segments that make up the rings, without recesses overlapping grooves formed by recesses in the stator and rotor rings. Milling steps are formed between the rings without recesses, which can be made with different size and shape grooves formed from the recesses, as well as with a different gap between the rotor and the stator. It is possible to produce grooves of different sizes and shapes not only in adjacent grinding stages, but also in one stage, if necessary. When using segments without recesses, it is possible to place them not in one ring, but with breaks and alternation of these breaks between adjacent delay stages.

The rotor and / or stator rings are easily manufactured using universal technologies for sheet cutting of materials, the use of segments in large-diameter mills allows saving material during cutting, without compromising the strength characteristics of the mill.

The proposed set of features characterizes a simpler and more technologically advanced design of a vortex segment mill, which reduces its cost. At the same time, it is possible to manufacture almost any geometry anywhere on the machining surfaces of the rotor and stator, as well as when they are worn out, only a small number of segments and rings will need to be replaced, which will reduce operating costs.

In FIG. 1 presents a General view of the claimed vortex segment mill.

In FIG. 2 shows a mill, a top view.

In FIG. 3 shows a mill in cross section.

In FIG. 4 shows an enlarged view of the rotor and stator in cross section.

In FIG. 5 shows an enlarged cross-sectional fragment of the first stage of the rotor and stator.

In FIG. 6 shows an enlarged cross-sectional fragment of the second stage of the rotor and stator.

In FIG. 7 shows an enlarged fragment of the cross section of the third stage of the rotor and stator.

In FIG. 8 shows the rotor assembly.

In FIG. Figure 9 shows the rotor segments of two sizes with different recesses.

In FIG. 10 shows a stator assembly.

In FIG. 11 shows stator segments of two sizes with different recesses.

In FIG. 12 shows the formation of vortex pockets in the recesses of the rotor and stator.

The vortex segment mill comprises a stator 2 and a rotor 3 located on the base 1, the outlet pipe 4 for grinding products and the inlet pipe 5 (Figs. 1, 3). The shaft 6 is connected through a drive belt to an electric motor 7. The rotor 3 is attached to the shaft 6 by means of bolts 8 (otherwise, studs 8) (Figs. 1, 3, 5). The surfaces of the rotor 3 and the stator 2 facing each other ensure grinding of the material in that at least one of the surfaces is formed of segments with recesses. The stator and rotor surfaces facing each other are assemblies of rings and segments assembled into rings made of sheet steel and fixed with bolts 8 and 9 (Figs. 4, 5).

In FIG. 4, sections BB, GG, DD are shown, respectively shown in FIG. 5, 6, 7. Between the segments of the stator 11 and the segments of the rotor 12 (Fig. 5, 9, 11) a gap A is formed, between the segments of the stator 13 and the rotor 14 (Fig. 6) a gap B is formed, between the segments of the stator 15 and the rotor 16 (Figs. 7, 9, 11) a gap B is formed. The possibility of manufacturing different gaps and recesses of different sizes is shown. The shape of the recesses can be any.

The grinding stages are separated by the rings of the rotor 17 (Fig. 8) and the rings of the stator 18 (Fig. 10). The length of the grooves in the steps is determined by the number of rings, or rings assembled from the segments.

The creation of a mill, according to the invention, begins with the manufacture of rings and segments for the rotor and stator on universal equipment for sheet metal cutting. The stator and rotor are assembled on the same frame. The stator is assembled from rings and segments on the bed and the rings are pulled together with bolts 9 (Fig. 4), fastening the entire stator structure. On the bed, inside the stator, install the shaft 6 on the bearing bearings (Fig. 3). At one end of the shaft, similarly to the stator, using the coupling bolts 10 (studs 10), the rotor is assembled. From the ends of the stator arrange channels 5 and 4 for supplying and discharging the processed material (Fig. 1).

During the operation of the mill, the rotor 3 (Fig. 1) is given rotation, a vacuum is created in the outlet channel, and the processed material is fed into the inlet channel. The processed material enters the gap between the rotor and the stator and forms a fluidized bed 19 with transport gas (air) (Fig. 12). The recesses in the rings, or segments, form vortex cavities 20 in the rotor and stator (Fig. 12), in which when the rotor rotates, vortices of the milled material 21 are formed. When the vortex cavities move relative to each other when the rotor rotates, the vortices 21 of the milled material hit the fluidized bed layer 19, and at certain intervals hit each other in the pressure zone, point 22 (Fig. 12). Also, when the vortices rotate, low pressure zones are formed 23. The pressure drops during the formation of vortices both in the rotor and stator are doubled compared to designs where the vortex cavities are made only in the rotor, which positively affects the efficiency of the mill. The rings of the rotor and stator without recesses form barriers separating the vortex pockets in the axial direction to increase the residence time of the material in the processing zone - the fluidized bed 19.

Claims (4)

1. A mill containing a rotor and a stator, the surfaces of which are facing each other, characterized in that at least one of the surfaces is formed from segments with recesses to ensure grinding of the material. 2. The mill according to claim 1, characterized in that the segments with recesses form rings. 3. The mill according to claim 1, characterized in that the rings or ring segments are made of sheet material. 4. The mill according to claim 1, characterized in that the rings and ring segments are connected by bolts.

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