EP3050628A1 - Agitator bead mill and grinding disc for agitator bead mills - Google Patents

Abstract

The invention relates to a stirred ball mill for processing and in particular comminution of millbase with the aid of grinding media. The agitator ball mill comprises an agitator with a rotatable axial agitator shaft, with at least one grinding disc arranged substantially vertically on the axial agitator shaft. The grinding disk has two end faces with front side planes formed essentially orthogonal to the axial stirring shaft of the agitator. According to the invention, the grinding disc comprises regions in which a first of the two end faces has first elevations and / or first depressions with respect to the first end side plane. Furthermore, the grinding disk comprises regions in which a second of the two end faces has second elevations and / or second depressions with respect to the second end side plane. Through the elevations and / or depressions on each end face in each case flow channels for a millbase and Mahlkörper comprehensive product flow are formed. The invention further relates to a grinding disk for a stirred ball mill.

Description

The present invention relates to an agitating ball mill and a grinding disk according to the features of the preambles of claims 1 and 15.

State of the art

The invention relates to a grinding disk for stirred ball mills. The agitator ball mill is a device for coarse, fine and very fine comminution or homogenization of regrind. An agitator ball mill consists of a vertically or horizontally arranged, usually approximately cylindrical grinding container, which is filled to 70% to 90% with grinding media. The grinding container is usually stored stationary in stirred ball mills. An agitator with suitable stirring elements ensures the intensive movement of the grinding media. Many conventionally known mills are filled by a central opening in one of the end walls. The filling can alternatively also be done directly on the grinding cylinder. The millbase suspension is pumped continuously through the grinding chamber. The suspended solids are crushed or dispersed by impact and shear forces between the grinding media. The discharge depends on the design and takes place, for example, through a sieve at the end of the mill.

The agitator is typically formed by an agitator shaft which serves to rotate discs or radially projecting pins, particularly to deagglomerate and disintegrate solids dispersed in liquid. The agitator shaft is usually driven by a motor. Disk stirrers with a plurality of grinding disks arranged on a stirring shaft are used as suitable stirring elements. The grinding discs are usually circular and can be provided with passage openings. In particular, the product flow is ensured via the passage opening. Slices are also known radially protruding ridges extending outwardly from the inner periphery of the disk to provide more intense activation of the media.

Smooth grinding disks known from the prior art predominantly produce layer flows of the grinding bodies in the radial and tangential direction, the grinding bodies rubbing against one another. Axial impulses (impact effects) are hardly effective.

DE 60115392 T2 describes a fine mill with improved grinding disc. At least one of the grinding discs has an axially extending pin radially outwardly offset from the shaft and radially inwardly offset from the outer edge of the grinding disc and having a distal end facing a smooth surface portion of a next adjacent grinding disc. The pin acts as an activation element positive to the grinding media movement. In particular, the pins of the grinding discs activate the grinding bodies alternately in the axial direction. This leads increasingly to contacts between the grinding media and thus more effective crushing operations.

However, the above-described prior art also has disadvantages. Eccentric discs produce, for example, an imbalance that leads to vibrations of the agitator ball mill. The so-called Trinex discs - these have a basic shape in the form of a triangle with rounded corners - can not optimally activate the grinding media or cause an insufficient power input into the material to be ground or the Mahlkörperpackung. In the in the DE 60115392 T2 grinding disks described results in a strong displacement of the grinding media in the separation area, in which the grinding media are separated from the product. In this separation area, however, the grinding media concentration should be as low as possible.

The object of the invention is to provide a stirred ball mill with grinding disks which bring about an improvement in the grinding action and / or efficiency of the stirred ball mill and which do not have the disadvantages of the prior art.

The above object is achieved by an agitator ball mill and by a grinding disk comprising the features in claims 1 and 15. Further advantageous embodiments are described by the subclaims.

description

The invention relates to a stirred ball mill for processing and in particular comminution of millbase with the aid of grinding media. Such an agitator ball mill comprises an agitator with a rotatable axial agitator shaft and with at least one grinding disc arranged substantially perpendicularly on the axial agitator shaft. In particular, the grinding disk has two circular end faces with front side planes formed substantially perpendicular to the axial stirring shaft of the agitator. According to the invention, the grinding disk comprises first regions in which a first of the two end faces has first elevations and / or first depressions with respect to the first end side plane. Furthermore, the grinding disc comprises second regions in which a second of the two end faces has second elevations or second depressions with respect to the second end side plane. The elevations and / or depressions of the respective end faces each form flow channels for the product stream of ground material and grinding bodies. The product flow is directed away from the face planes of the grinding disc by the flow channels, in particular the product flow is directed into the space between two grinding discs. The flow channels formed by the elevations and / or depressions cause mutual axial impulses to the grinding media and the formation of so-called relief and compression zones. This leads to vibrations or turbulences and thus to an increased impact frequency between the grinding bodies.

The elevations and / or depressions of the end faces continue to increase the active surface of the end faces of the grinding disc, whereby the activation of the grinding media is enhanced. In particular, the elevations and / or depressions according to the invention in the radial alignment of the grinding disk cause an increase of axial impact effects.

According to a preferred embodiment, the grinding disk comprises first regions in which the first end face has elevations with respect to the first end side plane. In contrast, the grinding disc in these areas on the second opposite end side recesses relative to the second front side plane. In particular, the grinding disk has the same thickness in this first region as in adjacent regions. Alternatively or additionally, the grinding disk can comprise second regions in which the first end side has depressions with respect to the first end side plane and wherein the grinding disk has second elevations with respect to the second end side plane in these second regions on the second end side. In particular, the areas in which the first end face has first elevations correspond to the areas of the grinding disks in which the second end face has second depressions and vice versa. In particular, the second end face thus represents an inverse image of the first end face of the grinding disc.

According to a further embodiment of the invention it is provided that the grinding disc has elevations in first areas on the first end face and has elevations in second areas on the second end face. In the first regions, the second end side corresponds to the second end side plane, and in the second regions, the first end side corresponds to the first end side plane.

According to one embodiment of the invention, the elevations and / or the depressions extend radially from a central shaft opening for the agitator shaft of the agitator to an outer edge or outer periphery of the grinding disc. According to a further embodiment, the elevations and / or the depressions extend from a central shaft opening for the agitator shaft of the agitator to an outer edge or outer circumference of the grinding disc, wherein the recesses are formed at an angle not equal to 0 ° to the radii of the grinding disc. According to one embodiment of the invention, the recesses are formed at an angle between 15 ° and 75 ° to the radii of the grinding disc.

The elevations and depressions of an end face may be formed alternately, for example, in a regular pattern, that is, elevations and depressions are alternately in a uniform pattern on the respective Front side arranged. Furthermore, it can be provided that the elevations and / or depressions are in each case structured and have so-called substructures. The substructures are, for example, another profile of smaller elevations and depressions.

According to one embodiment of the invention, the grinding disk has a first thickness in the region of the central shaft opening. In contrast, the grinding disc has a second thickness in the region of its outer circumference, which is greater than the first strength. That is, in particular, the thickness of the grinding disc increases radially outward. This also leads to the formation of compression and / or relief zones. For example, indentations can be milled into such a grinding disk which thickens outwards, in order to achieve the desired alternating axial movements in the grinding stock / product flow. In particular, mutual millings are used to obtain a pattern as described above in which raised areas on one end face correspond to depressions on the other end face.

Alternatively, a conical enlargement or thickening of the grinding disk toward the outer edge can take place successively on different inner radii or circular rings of the grinding disk. In conjunction with oppositely directed milled grooves in adjacent rings, a further intensification of the radial flow can be effected, which also generates pressure differences and thus causes cavitation effects.

For example, the end faces of the grinding disk can each be subdivided into at least two circular rings, wherein alternating areas with elevations and depressions are formed within the circular rings. In particular, it is again provided that regions are formed in such a way that, for example, elevations are formed on the first end side and depressions are formed on the second end side. Furthermore, according to one embodiment it is provided that recesses in an inner annulus on one end face of the grinding disc have no or only partially abutment areas with recesses in an adjacent outer annulus of the same end face of the grinding disc. In addition, it is provided that elevations in the inner annulus on one end of the Mahlscheibe have no or only partially abutment areas with elevations in the adjacent outer annulus on the same face of the grinding disc.

According to a special embodiment of a grinding disk divided into at least two circular rings, the depressions in an inner circular ring do not have any abutment areas with depressions in an adjacent outer circular ring. In addition, the elevations in the inner annulus have no abutment areas with elevations in the adjacent outer annulus. In particular, within a circle segment comprising a sub-segment of the inner annulus and a sub-segment of the outer annulus, a protrusion and a recess are arranged in alignment.

According to a further embodiment of a grinding disk which is subdivided into at least two circular rings, the depressions in an inner circular ring have no adjacent regions with depressions in an adjacent outer circular ring. On the other hand, elevations in the inner circular ring have areas of adjoining areas with elevations in the adjacent outer circular ring. In this exemplary embodiment, it can be provided, for example, that the pattern of elevations and depressions on one end face of the grinding disk is not reproduced 100% inversely on the other end face of the grinding disk.

According to a further embodiment of a grinding disk divided into at least two circular rings, the depressions are formed in an inner circular ring at a first angle not equal to 0 ° to the radii of the grinding disk. In contrast, the recesses are formed in an adjacent outer annulus at a second angle not equal to 0 ° to the radii of the grinding disc, wherein the first angle is not equal to the second angle. For example, the first angle is an acute angle and the second angle is a negative acute angle to a radius of the grinding disk. For example, the grinding discs are made of a solid material, in which the recesses are incorporated, in particular milled, in order thus to form the elevations and / or recesses with respect to a front side plane of the grinding disc. By milling the recesses in the solid material, it is possible to introduce the recesses with different angles in the grinding disc, so that the recesses are not divided radially to the disc axis.

The grinding wheel can also be made by other suitable methods from a solid material, for example by means of a forming process such as molding or the like.

According to a preferred embodiment of the invention, at least two adjacent grinding discs are arranged on a stirring shaft such that the respectively directly opposite side surfaces are each formed in mirror image. In particular, recesses of a grinding disc are directly formed axially opposite to depressions of the other grinding disc and elevations of a grinding disc are formed directly axially opposite to) increases the other grinding disc. As a result, there are widened areas between the two grinding disks in the region of the respective depressions with a greater distance between the two grinding disks. These are so-called relief zones. Furthermore, there are narrowed areas between the two grinding disks in the region of the respective elevations with a smaller distance between the two grinding disks. These are so-called compaction zones. There is a pressure difference between the relief zones and the compression zones, producing axial pulses. This leads to vibrations in the millbase-Mahlkörper- product flow and thus to an additional stress on the regrind particles. The invention further relates to a grinding disc for an agitator of a stirred ball mill for processing and in particular comminution of millbase with the aid of grinding bodies with the features described above.

figure description

• Figuren 1A bis 1 D zeigen verschiedene Ansichten einer ersten Ausführungsform einer erfindungsgemäßen Mahlscheibe.
• Figuren 2A bis 2B zeigen verschiedene Möglichkeiten von weiteren Ausführungsformen von erfindungsgemäßen Mahlscheiben.
• Figur 3 zeigt weitere Ausführungsformen der Strukturierung von erfindungsgemäßen Mahlscheiben.
• Figuren 4A bis 4D zeigen verschiedene Ansichten einer vierten Ausführungsform einer erfindungsgemäßen Mahlscheibe.
• Figur 5 zeigt das Strömungsverhalten von Mahlkörpern zwischen zwei erfindungsgemäßen Mahlscheiben gemäß den Figuren 1A bis 1 D.
• Figur 6 zeigt das Strömungsverhalten von Mahlkörpern zwischen zwei erfindungsgemäßen Mahlscheiben gemäß den Figuren 1A bis 1D, die spiegelbildlich zueinander angeordnet sind.

In the following, embodiments of the invention and their advantages with reference to the accompanying figures will be explained in more detail. The proportions of the individual elements to one another in the figures do not always correspond to the actual size ratios, since some shapes are simplified and other shapes are shown enlarged in relation to other elements for better illustration.

• FIGS. 1A to 1 D show different views of a first embodiment of a grinding disc according to the invention.
• FIGS. 2A to 2B show various possibilities of further embodiments of grinding discs according to the invention.
• FIG. 3 shows further embodiments of the structuring of grinding discs according to the invention.
• FIGS. 4A to 4D show different views of a fourth embodiment of a grinding disc according to the invention.
• FIG. 5 shows the flow behavior of grinding media between two grinding discs according to the invention according to the FIGS. 1A to 1 D ,
• FIG. 6 shows the flow behavior of grinding media between two grinding discs according to the invention according to the Figures 1A to 1D , which are arranged in mirror image to each other.

For identical or equivalent elements of the invention, identical reference numerals are used. Furthermore, for the sake of clarity, only reference symbols are shown in the individual figures, which are required for the description of the respective figure. The illustrated embodiments are only examples of how the device according to the invention can be designed and do not represent a final limitation.

FIGS. 1A to 1 D show different views of a first embodiment of a grinding wheel 1, 1 a according to the invention. In particular shows Figure 1A a top view of a first end face 4 of a grinding disc 1a, FIG. 1B shows a section through a grinding disc 1a along the in Figure 1A illustrated section line AA, FIG. 1C shows a side view of a grinding disc 1 a and FIG. 1 D shows a perspective view of a grinding disc 1 a. The grinding disk 1 a comprises a circular disk body 3 with a central axle opening 2 for the stirring axis of the agitator (not shown). Furthermore, the grinding disc 1 a flow openings 10 for the material to be ground and the grinding media.

The grinding disc 1 a has on both end faces 4, 5 each elevations 6, 6 *. The depressions formed between the elevations 6, 6 * are also referred to below as grooves 7, 7 *, which do not entirely correspond to the grinding disk 1 a penetrate. The elevations 6, 6 * and grooves 7,7 * may be arranged arbitrarily or even regularly. In the illustrated embodiment, the elevations 6, 6 * and grooves 7.7 * are arranged regularly spaced. In particular, it is provided that a first elevation 6 on the first end face 4 is assigned a corresponding second groove 7 * on the second end face 5. Furthermore, it is provided that a first groove 7 on the first end face 4 is assigned a corresponding second elevation 6 * on the second end face 5.

Due to the inventive design of the grinding disc 1a, it comes to axial pulses on the grinding media to form so-called relief and compression zones. That is, the elevations 6, 6 * and grooves 7, 7 * cause an outwardly directed Mahlgut- Mahlkörperstrom S, wherein the Mahlgut-Mahlkörperstrom S in particular by the grooves 7, 7 * is discharged to the outside. The elevations 6, 6 * and grooves 7, 7 * continue to cause additional vibration in the grinding media or in the Mahlgut- Mahlkörperpackung and thus lead to a high burst frequency between the grinding media or Mahlgut- Mahlkörperpackungen.

Furthermore, due to the depressions 7, 7 *, pressure differences occur on the surface of the end faces 4, 5, which can lead to cavitation effects and increase the dispersing effect.

Due to the elevations 6, 6 * and depressions 7, 7 *, the active disk surface of the end faces 4, 5 is further increased. This leads to an increased or more intense activation of the grinding media. In the illustrated embodiment, the grinding disc 1 a is provided with passage openings 10 for generating targeted product flows. According to an alternative embodiment, the grinding disk has no passage openings. However, the embodiment of a grinding disk 1 a with passage openings 10 has the advantage that the passage openings 10 increase the activation of the grinding bodies, in particular at the edges of the grinding disk 1 a additionally formed by the passage openings 10. In the case of grinding disks without passage openings, the entire grinding stock stream flows past the grinding disks.

According to an embodiment, not shown, it may be provided that further grooves extend in already existing grooves 7, 7 *, that is, the depressions 7, 7 * have a further substructure.

FIGS. 2A to 2B show various possibilities of further embodiments of grinding discs 1, 1b according to the invention. In particular, the grinding disc 1b is divided into quadrant sectors I to IV, each quadrant sector I to III representing a different embodiment of a grinding disc 1b-1, 1b-II, 1b-III, 1b-IV with different elevations 6 and depressions 7 , In this case, the elevations 6 or depressions 7 are subdivided by further structures 6U, 7U, for example, it is found according to FIG FIG. 2B in a raised area 6 a serrated profiling 6U. In particular, several rows of elevations 6U are arranged one behind the other. In this case, the elevations 6U are always offset, so that a recess 6U always follows a recess or a gap 8. The size of the elevations 6U and recesses or gaps 8 can always be the same or variable, and the arrangement of elevations 6 and recesses 7 in different sizes on a grinding disk 1 is conceivable.

Sector I shows an embodiment of a grinding disc 1b-I. Here, the grinding disc 1c-I is divided into radial sectors 11 of equal size, wherein a radial sector 11 is divided from the center of the grinding disc 1b-I to the outer edge into an inner sub sector 12a and an outer sub sector 12b. In this case, it is provided that an inner subsector 12 a, in particular elevations 6 and the radially adjacent outer subsector 12 b, on the other hand depressions 7. Furthermore, it is provided that elevations 6 and depressions 7 are arranged alternately in directly adjacent inner sub-sectors 12a and directly adjacent outer sub-sectors 12b, respectively. In particular, the subsectors 12a, 12b are arranged alternately regularly, which represent the sectors 11 each angle segments of the same size. The elevations 6 and recesses 7 each have at least approximately a trapezoidal shape.

Sector II shows an embodiment of a grinding disc 1b-II. Here, the radial sectors 11 a, 11 b each have different angular widths. Analogous to the grinding disc 1b-I, the elevations 6 in an outer annulus of a radial Sector 11 adjacent to recesses 7 of an inner annulus of the same radial sector 11 and adjacent to recesses 7 of an outer annulus of a directly adjacent radial sector eleventh

Sector III shows an embodiment of a grinding disc 1b-III. In this case, the radial sectors 11 each have different angular widths. Furthermore, elevations 6 and depressions 7 are formed irregularly. For example, it can be provided that a recess 7 projects partially into an adjacent radial sector 11.

Sector IV shows an embodiment of a grinding disc 1b-IV. In this case, the radial sectors 11 each have different angular widths. Furthermore, elevations 6 and recesses 7 are formed only in each second radial sector 11, wherein the arrangement of the elevations 6 and depressions in the inner and outer annuli of each divided radial sector 11 is the same. FIG. 3 shows further embodiments of the structuring of grinding discs 1, 1c according to the invention. In particular, the grinding disc 1 c is divided into Viertelkreissektoren I to IV, each quadrant sector I to III a different embodiment of a grinding disc 1c-1, 1c-II, 1 c-III with different configurations of elevations 6 and recesses 7 represents. Here, the elevations 6 and recesses 7 are machined out of a solid material, in particular, the recesses 7 are milled out of the solid material. This makes it easy to introduce recesses 7 with different angles in the grinding disc 1c-1, 1c-II, 1c-III, so that the recesses 7 need not be divided radially to the disc axis.

Sector I shows an embodiment of a grinding wheel 1c-1 having radial sectors 11 divided from the center of the grinding wheel 1c-1 to the outer edge into inner subsectors 12a and outer sub sectors 12b. In particular, the sectors 11 are divided into two rows. In this case, it is provided that an inner subsector 12 a, in particular elevations 6 and the radially adjacent outer subsector 12 b, on the other hand depressions 7. Furthermore, it is provided that elevations 6 and depressions 7 are arranged alternately in directly adjacent inner sub-sectors 12a and directly adjacent outer sub-sectors 12b, respectively. In particular, the subsectors 12a, 12b regularly arranged alternately, which represent the sectors 11 each angle segments of the same size. The elevations 6 and recesses 7 each have at least approximately a trapezoidal shape.

Sector II shows an embodiment of a grinding disc 1c-II, in which also a subdivision into an inner annulus 13 and an outer annulus 14 is provided. Within the circular rings 13, 14, elevations 6 are provided, which each show in the plan view the shape of an isosceles trapezium. Furthermore, recesses 7 are provided, which show the shape of a rectangle in plan view. The elevations 6 and depressions 7 are arranged regularly and alternately within a circular ring 13, 14. The recesses 7 have a width B which is smaller than the longer broad side of an increase 6 ₁₃ in the inner annulus 13 and less than the shorter broad side of an increase 6 ₁₄ in the outer annulus 14. Preferably, the rectangular recess 7 ₁₃ , 7 ₁₄ inside and outer circular ring 13, 14 each have the same width B.

The depressions 7 are arranged such that the central axis of a trapezoidal elevation 6 ₁₄ in the outer annulus 14 and the central axis of a rectangular recess 7 ₁₃ in the inner annulus 13 lie on a common axis and that the central axis of a rectangular recess 7 ₁₄ in the outer annulus 14 and the central axis of a trapezoidal elevation 6 ₁₃ in the inner annulus 13 also on a common axis, in particular on a radius r of the grinding disc 1c-II lie. In particular, a rectangular depression 7 _{13 of} the inner circular ring 13 adjoins a trapezoidal elevation 6 ₁₄ in the outer circular ring 14. Owing to the width B of the rectangular depressions 7 and the arrangement described above, an overlap of the elevations 6 ₁₃ , 6 ₁₄ results means in particular that the trapezoidal elevations 6 ₁₃ , 6 _{14 of} the inner and outer circular ring 13, 14 adjacent to each other in regions. Such an abutment area is shown by reference number 15.

Sector III shows an embodiment of a grinding disc 1c-III, in which recesses 7 were introduced at different angles α1, α2 in the grinding disc 1c-III, so that the recesses 7 are not divided radially to the disc axis. In particular, the depressions 7 each have approximately the shape of a Parallelogram on. The recesses 7 ₁₃ in the inner circular ring 13 are formed at a first angle α1 not equal to 0 ° to a radius r of the grinding disc 1c-III. In contrast, the recesses 7 _{14 are formed} in the adjacent outer circular ring 14 at a second angle α2 not equal to 0 ° to a radius r of the grinding disc 1c-III. These are each acute angles α1, α2 but with different signs. Alternatively, it could also be each acute angle with the same sign but different amount.

According to a further, not shown embodiment can also be provided within a circular ring 13, 14 parallelogram-like recesses 7 each having different angles to a radius r of the grinding disc 1c-III provided.

FIGS. 4A to 4D show different views of a fourth embodiment of a grinding disc 1, 1 d according to the invention. In this case, the axial impulse or the compression and / or relief zone is achieved by different depths milled. In particular, a thickness of the grinding disc 1d in the region of an inner diameter d _I and an outer diameter d _{A is} equal.

In particular, the grinding disk 1d has mutual recesses 7 or milling cuts, which lead to alternating axial movements of the material to be ground and of the grinding bodies. Due to the resulting activation surfaces, an intensification of the radial flow S is further effected. According to a further embodiment, the grinding disc 1d could be analogous to those in the FIGS. 2 and 3 described embodiments have cutouts on different inner radii or circular rings. For example, opposing millings can be provided in adjacent rings (see grinding disc 1 c-III in FIG. 3 ). The milled cuts can in this case be designed, for example, at different depths and / or arranged irregularly. In particular, the shape, the angle arrangement and / or the width of the milled slots can be chosen differently. Analogous to that in the FIGS. 1A to 1 D described first embodiment of a grinding disc 1 a cause pressure differences here also advantageous cavitation effects.

FIG. 5 shows the flow behavior of grinding bodies between two inventive first grinding discs 1 a according to the in the FIGS. 1a to 1 D illustrated first embodiment. The structuring according to the invention of the end faces 4, 5 of the grinding disks 1a, in particular by elevations 6 and grooves 7, effects an outwardly directed grinding material stream S. The ground material grinding body stream S is in particular discharged through the grooves 7 into the intermediate space Z between the grinding disks 1a. In addition, vibrations are increasingly taking place in the grinding bodies or in the grinding material / grinding body packing, which lead to an increased impact frequency between the grinding bodies or within the grinding material grinding body packings and thereby cause a more intensive stress on the grinding material particles.

FIG. 6 shows the flow behavior of grinding bodies between two inventive first grinding discs 1 a, 1 a * according to the in the FIGS. 1A to 1 D illustrated first embodiment, wherein the grinding discs 1 a, 1 a * are arranged in mirror image to each other. Due to the mirror-image arrangement of the grinding disks 1 a, 1 a * recesses 7 of a grinding disc 1 a directly opposite recesses 7 * of the other grinding disc 1 a formed * and elevations 6 of a grinding disc 1 a are directly opposite to elevations 6 * of the other grinding disc 1 a * educated. This results in the intermediate space Z between the two grinding disks 1 a, 1 a * through the respectively outwardly directed Mahlgut- Mahlkörperstrom S particular compression zones V and relief zones E, in which the Mahlgut- Mahlkörperstrom S is exposed to different forces. The compression zones V are formed in particular in the area between the two grinding disks 1a, 1a *, which is narrowed due to the respective elevations 6, 6 * of the grinding disks 1a, 1a * and by the relative distance A1 between the two grinding disks 1a , 1a * is reduced.

The relief zones E are formed in particular in the region between the two grinding disks 1 a, 1 a *, which is widened due to the respective recesses 7, 7 * of the grinding disks 1 a, 1 a * and by the relative distance A 2 between the two grinding disks 1 a, 1a * is increased. Between the relief zones E and the compression zones V there is a pressure difference, whereby axial pulses are generated. This leads to vibrations in the millbase Mahlkörperstrom S and thus to an additional stress of MahlgutPartikel.

The invention has been described with reference to a preferred embodiment. However, it will be apparent to those skilled in the art that modifications or changes may be made to the invention without departing from the scope of the following claims.

LIST OF REFERENCE NUMBERS

1

grinding disc

2

central axle opening

3

washer body

4

first end face

5

opposite front side

6

increase

7

Recess / groove

8th

gap

10

flow-through

11

sector

12

subsector

13

inner circle

14

outer circular ring

15

abutting section

α

angle

A

relative distance

B

width

D

diameter

e

relief zone

I to IV

Quarter circle sectors

r

radius

S

Grist media product flow

V

compression zone

Z

gap

Claims (15)

Agitator ball mill for processing and in particular comminution of ground material with the aid of grinding bodies, comprising an agitator with a rotatable axial agitator shaft, with at least one grinding disc (1) arranged substantially vertically on the axial agitator shaft, the grinding disc (1) comprising two end faces (4, 5 ) with front orthogonal to the axial stirrer shaft of the agitator formed front side planes, characterized in that the grinding disc (1) comprises regions in which a first of the two end faces (4) first elevations (6) and / or first recesses (7) relative to the has first front side plane and that the grinding disc (1) comprises regions in which a second of the two end faces (5) second elevations (6 *) and / or second recesses (7 *) opposite the second front side plane, wherein by the elevations (6 ) and / or depressions (7) on each end face each comprise flow channels for a millbase and grinding media n product stream (S) are formed. Agitator ball mill according to claim 1, wherein the grinding disc (1) comprises first regions in which the first end face (4) has elevations (6) opposite the first end plane and wherein the grinding disc (1) in these first regions on the second end face (5 ) Has recesses (7 *) opposite the second front side plane and / or wherein the grinding disc (1) comprises second regions in which the first end face (4) has recesses (7) opposite the first end plane and wherein the grinding disc (1) in has these second areas on the second end face (5) elevations (6 *) relative to the second front side plane. Agitator ball mill according to one of the preceding claims, wherein the elevations (6, 6 *) and / or the recesses (7, 7 *) relative to the end faces (4, 5) radially from a central shaft opening (2) for the agitator shaft of the agitator extend an outer edge of the grinding disc (1). Agitator ball mill according to one of claims 1 to 2, wherein the elevations (6, 6 *) and / or the recesses (7, 7 *) relative to the end faces (4, 5) of a central shaft opening (2) for the agitator shaft of the agitator extend to an outer edge of the grinding disc (1), wherein the recesses (7, 7 *) at an angle not equal to 0 ° to radii (r) of the grinding disc (1) are formed, in particular wherein the recesses (7, 7 *) in an angle between 15 ° and 75 ° to radii (r) of the grinding disc (1) are formed. Agitator ball mill according to one of the preceding claims, wherein the elevations (6, 6 *) and depressions (7, 7 *) are formed alternately in a regular pattern. Agitator ball mill according to one of the preceding claims, wherein the elevations (6, 6 *) and / or recesses (7, 7 *) are each structured and / or have a profile of elevations (6u) and depressions. Agitator ball mill according to one of the preceding claims, wherein the grinding disc (1) in the region of the central shaft opening (2) has a first thickness and wherein the grinding disc (1) in the region of its outer periphery has a second thickness, wherein the first thickness is less than the second Strength. Agitator ball mill according to one of the preceding claims, wherein the end faces (4, 5) of the grinding disc (1) are each divided into at least two circular rings (13, 14) and wherein within the circular rings (13, 14) alternating areas with elevations (6) and Recesses (7) are formed, wherein recesses (7) in an inner annulus (13) no or only a partially abutment regions (15) with recesses (7) in an adjacent outer annulus (14) and wherein elevations (6) in the interior Circular ring (13) no or only partially abutment areas (15) with elevations (6) in the adjacent outer annulus (14). Agitator ball mill according to one of claims 1 to 7, wherein the end faces (4, 5) of the grinding disc (1) are each divided into at least two circular rings (13, 14) and wherein within the circular rings (13, 14) respectively alternating areas with elevations ( 6) and recesses (7) are formed, wherein recesses (713) in an inner annulus (13) no abutment areas (15) with recesses (714) in an adjacent outer annulus (14) and wherein elevations (6) in the inner annulus (13) have no abutment areas (15) with elevations (6) in the adjacent outer annulus (14) (see embodiment 1c-I in Figure 3) or wherein recesses (713) in an inner annulus (13) no abutment areas (15) Recesses (714) in an adjacent outer annulus (14) and wherein elevations (6) in the inner annulus (13) area adjacent abutment areas (15) with elevations (6) in the adjacent outer annulus (14) , (compare embodiment 1c-II in Figure 3) Agitator ball mill according to one of claims 1 to 8, wherein the end faces (4, 5) of the grinding disc (1) are each divided into at least two circular rings (13, 14) and wherein within the circular rings (13, 14) alternating areas with elevations (6 ) and recesses (7) are formed, wherein the recesses (7) at an angle (α) not equal to 0 ° to radii (r) of the grinding disc (1) are formed, in particular wherein the recesses (7) at an angle (α) are formed between 15 ° and 75 ° to radii (r) of the grinding disc (1). Agitator ball mill according to one of claims 1 to 8, wherein the end faces (4, 5) of the grinding disc (1) in each case in at least two circular rings (13, 14) are divided and wherein within the circular rings (13, 14) respectively alternating areas with elevations ( 6) and recesses (7) are formed, wherein the recesses (7 ₁₃ ) in an inner annulus (13) at a first angle (α1) not equal to 0 ° to the radii of the grinding disc (1) are formed and wherein the recesses (7 ₁₄ ) are formed in an adjacent outer circular ring (14) at a second angle (α2) not equal to 0 ° to the radii of the grinding disc (1), wherein the first angle (α1) is not equal to the second angle (α2). Agitator ball mill according to one of the preceding claims, wherein the grinding disc (1) is made of a solid material, in which the recesses (7) incorporated, in particular milled, are. Agitator ball mill according to one of the preceding claims, wherein the grinding disc (1) by means of a forming process, for example by means of casting. Agitator ball mill according to one of the preceding claims, wherein on the agitator shaft at least two grinding discs (1 a, 1a *) are arranged such that recesses (7) of a grinding disc (1 a) axially opposite recesses (7 *) of the other grinding disc (1a *) and elevations (6) of a grinding disc (1 a) axially opposite to elevations (6) of the other grinding disc (1a *) are arranged. Grinding disc (1) for an agitator of a stirred ball mill for processing and in particular comminution of grinding stock with the aid of grinding bodies, characterized in that the grinding disc (1) comprises regions in which a first end face (4) of the grinding disc (1) has first elevations (6) or first depressions (7) with respect to a first end side plane and that the grinding disc (1) comprises areas in which a second end face (5) second elevations (6 *) or second depressions (7 *) opposite to a second end plane has, through the elevations (6) and / or depressions (7) flow channels for a millbase and Mahlkörper comprehensive product flow (S) are formed.

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