Disc assembly and grinding unit for a mill, use of same for comminuting a grinding stock

Abstract

The invention relates to a disc assembly for a grinding unit, containing a plurality of discs (S) or consisting of a plurality of discs (S). Each of the discs (S) has a truncated conical or double conical or double truncated conical design, and for each discs (S), the angle between the surface line thereof and the cone axis > 30 to 82.5°. The discs (S) are stacked along a central axis (MA) of the assembly (A), and the assembly (A) has a plurality of radial grooves (RN) facing the central axis (MA) of the assembly (A) and radial webs (RS) facing away from the central axis (MA). Each of the radial grooves (RN) has a rounded groove base (NG), and each of the radial webs (RS) has a rounded edge (KT). The invention additionally also relates to a grinding unit which has at least two disc assemblies according to the invention and to the use of the assembly or the grinding unit according to the invention in order to comminute grinding stock.

Description

[0001] Disc arrangement and grinding mechanism for a mill, use of the same for crushing a material to be ground

[0002] Technical area

[0003] The present invention relates to an arrangement containing a plurality of discs or consisting of a plurality of discs according to claim 1, a grinding mechanism for a mill according to claim 10 and a use of the arrangement or the grinding mechanism according to claim 14.

[0004] Background of the invention

[0005] From the prior art, for example from publication EP 1 600214 A1, comminution devices for bulk material particles are known. These devices have rollers with a zigzag profile, the radial webs and radial grooves of which are arranged axially offset from one another in such a way that they form engagement pairs. A grinding gap is formed between the rollers, which has a zigzag shape when viewed from above onto the grinding mechanism or the roller pair. Grinding mechanisms of this type are also known to the person skilled in the art, for example, from the publication: Becher, T. et al.: "Neuer Mühlentyp für verschiedenen Rohstoffe" (New type of mill for a wide variety of raw materials), Brauwelt, No. 45, 2015, pages 1344 to 1349.

[0006] However, the inventors of the present application have observed that, with a sufficiently long service life of such comminution devices, local enlargements of the grinding gap occur in the area of ​​the radial web edges or radial groove bases, which disadvantageously allow insufficiently comminuted material to pass through the grinding mechanism. As a result, an optimal grist composition cannot be achieved. Furthermore, the grinding mechanism must be replaced or serviced, which increases the downtime of the grinding mechanism and maintenance costs.

[0007] Object of the invention

[0008] It is therefore an object of the present invention to provide a disk arrangement and / or a grinding mechanism in which wear-related enlargement of the grinding gap in the region of the radial web edges or radial groove bases is reduced or even avoided. Furthermore, it is an aspect of the present invention to provide a corresponding use.

[0009] Summary of the invention

[0010] The above-mentioned object is achieved by the arrangement according to claim 1. Advantageous embodiments are the subject of the dependent claims.

[0011] Thus, an arrangement A is claimed which contains a plurality of disks S or consists of a plurality of disks S. Each of the disks S has a truncated cone or double cone or double truncated cone shape; wherein for each of the disks S the angle between a generatrix (= flank) of the disk S and a cone axis KA of the disk S is > 30 to 82.5°, preferably 40 to 75°; wherein the disks S are arranged stacked along a central axis MA of the arrangement A; wherein the disks S are arranged such that the cone axis KA of each disk S is arranged parallel or coaxially to the central axis MA of the arrangement A; wherein the arrangement A has a plurality of radial grooves RN pointing towards the central axis MA of the arrangement A; and wherein the arrangement A has a plurality of radial webs RS pointing away from the central axis MA of the arrangement A.In the arrangement A according to the invention, for each of the discs S the angle between a surface line (= flank) of the disc S and a cone axis KA of the disc S is defined in such a way that it corresponds to the smaller of the two angles between the surface line and the cone axis, in contrast to the usual angle measurement, which is always carried out counterclockwise, whereby the two angles are determined once by measuring counterclockwise and once by measuring clockwise.

[0012] The arrangement according to the invention is characterized in that the radial grooves RN each have a rounded, preferably concave, groove base NG; and the radial webs RS each have a rounded, preferably convex, edge KT. The disc arrangement according to the invention can be a component of a roller for a grinding mechanism of a mill for comminuting plant materials.

[0013] The inventors of the present invention have discovered that an increase in the grinding gap in the area of ​​the radial web edges or radial groove bases occurs due to wear of the disks in this area. Furthermore, they have discovered that, with the aid of the disk arrangement designed according to the invention as described above, an increase in the grinding gap and thus a disadvantageous change in the shot sorting can surprisingly be avoided or at least mitigated. Thus, instead of the conventional design of the radial webs with a tapered edge and a corresponding tapered V-groove of the radial grooves, the invention rounds off the edges of the radial webs, and replaces the tapered, V-shaped groove bases of the radial grooves with a rounded groove base.In the radial grooves RN according to the invention, a rounded groove base NG means a round groove with a predetermined radius (partial angle, depending on the opening angle OW of the radial groove RN) at the groove base.

[0014] By providing rounded edges on both the radial webs and the radial grooves, it is ensured that the material thickness in the area of ​​the radial webs is greater with a rounded or rounded edge design compared to tapered edges. This means that wear of the disc material during intended use of the arrangement in a grinder for comminuting plant material, for example, does not cause an increase in the grinding gap in the area of ​​the radial grooves, or at least the increase is less. In addition, the rounding of the edges or groove bases according to the invention allows a longer service life of the disc arrangement in a grinder. In addition, the rounding of the edges according to the invention significantly reduces the risk of injury to the fitter during installation or maintenance work compared to conventional radial webs with tapered edges.In addition, the risk of damage to the disc at its radial web during transport and / or installation is reduced, as the rounded edges of the radial webs are much less sensitive to impact or other mechanical influences.

[0015] For the purposes of the present invention, a "truncated cone, double cone, or double truncated cone shape" encompasses the corresponding ideal geometric shapes of the truncated cone, the double cone, and the double truncated cone. However, the present invention is not limited thereto, but may also encompass designs deviating from the ideal geometric shape, such as nonlinear, e.g., curved, stepped, or zigzag-shaped surface lines or flanks, which are common in the technical field of the application, namely in grinding mechanisms for mills suitable for comminuting plant solids, or are provided according to the invention (e.g., rounded edges or rounded grooves).

[0016] The discs of the arrangement according to the invention are made from materials customary for grinders, in particular from stainless steel, hardened steel or ceramic. The arrangement according to the invention is preferably rotationally symmetrical. It is preferred if the discs of the arrangement according to the invention are rotationally symmetrical at the edge or in the region of the edge. This particularly includes the case where the disc is rotationally symmetrical at the edge but has a regular or irregular profile on the outer surface. It is particularly preferred if the discs of the arrangement according to the invention are rotationally symmetrical, ie each disc of the arrangement according to the invention is rotationally symmetrical as a whole.

[0017] Advantageous embodiments of the arrangement according to the invention are the subject of the dependent claims.

[0018] Thus, the radial grooves RN can point perpendicular to the central axis MA of arrangement A. Alternatively or additionally, the radial webs RS can point perpendicularly away from the central axis MA of arrangement A.

[0019] These arrangements represent structurally simple implementations of the arrangement according to the invention. Due to the symmetrical design of the radial webs, their mechanical strength is particularly high.

[0020] In an advantageous embodiment of the arrangement according to the invention, the radius Ri of the radial grooves RN at the rounded groove base NG can be greater than the radius Ra of the radial webs RS at the rounded edge.

[0021] This ensures that when the arrangement according to the invention is used in a grinder with two parallel disc arrangements according to the invention, the radial webs RS of one arrangement and the radial grooves RN of the other, parallel arrangement (and vice versa) do not touch each other, thus avoiding damage. Furthermore, if the radius Ri of the radial grooves RN at the rounded groove base NG is larger than the radius Ra of the radial webs RS at the rounded edge, the grinding gap MS in the area of ​​the radial web edges (i.e. at the reversal points of the zigzag course of the grinding gap) is smaller than the grinding gap along the surface line or flank of the respective disc S (linear area between the reversal points). This effectively prevents excessively coarse particles or even whole grains from passing through the grinding gap in the area of ​​the rounded edges.In the arrangement according to the invention, the discs S can have a diameter of 40 to 500 mm, preferably 100 to 400 mm. Furthermore, in the arrangement according to the invention, the discs S can have a thickness of 30 to 200 mm, preferably 50 to 80 mm. This achieves high mechanical stability with comparatively low material usage.

[0022] Furthermore, the radius Ri of the radial grooves RN at the rounded groove base NG can be 0.5 to 25 mm, preferably 1 to 20 mm, in particular 2 to 10 mm. Alternatively or additionally, the radius Ra of the radial lands RS at the rounded edge KT can be determined according to the following first equation (GL1) (* = multiplication operator):

[0023] Ra = Ri - 2 * MS + RT (GL1)

[0024] Where: Ra = radius Ra of the radial lands RS at the rounded edge KT in mm; Ri = radius Ri of the radial grooves RN at the rounded groove base NG in mm; MS = grinding gap in mm; and RT = concentricity tolerance in mm. The concentricity tolerance is a correction value and is determined, for example, by the shaft, bearing, and disc dimension tolerances.

[0025] According to the invention, the grinding gap MS can have a value of 0.10 to 1.40 mm, preferably 0.10 to 0.80 mm, preferably 0.10 to 0.50 mm, preferably 0.20 to 0.60 mm, in particular 0.20 to 0.40 mm. Furthermore, the concentricity tolerance RT can have a value of 0.05 to 0.30 mm, preferably 0.10 to 0.20 mm, in particular 0.12 to 0.18 mm. According to the invention, the concentricity tolerance includes the bearing clearance resulting from wear and / or damage, deviations due to thermal expansion, the bearing tolerance, and a predetermined safety margin.

[0026] The arrangement according to the invention can be limited to individual ones of the above-mentioned or calculated value ranges of the parameters Ri, Ra, MS, and RT, or any combination thereof. Preferably, all of the above-mentioned parameters Ri, Ra, MS, and RT are limited to the above-mentioned or calculated value ranges, in particular to the respectively preferred or particularly preferred value ranges.

[0027] In a modification of this embodiment, the radius Ra of the radial webs RS at the rounded edge KT can be determined according to the following second equation (GL2) (* = multiplication operator; / = division operator):

[0028] Ra = Ri - 2 * (RT * cos(( 180 ° - OW) / 2) + RT) (GL2)

[0029] Where: Ra = radius Ra of the radial lands RS at the rounded edge in mm; Ri = radius Ri of the radial grooves RN at the rounded groove base NG in mm; OW = opening angle of the radial groove RN in °; and RT = concentricity tolerance in mm.

[0030] In this embodiment, the opening angle OW of the radial groove RN has a value of 15 to < 120°, preferably 30 to 100°, in particular 40 to 80°. The opening angle OW of the radial groove RN is fundamentally linked to the angle MWI between a surface line of the disc S and the cone axis KA of the disc S according to the following third equation (GL3):

[0031] OW = 180 ° - 2 * MWI (GL3)

[0032] Furthermore, in this embodiment, the runout tolerance RT has a value of 0.05 to 0.30 mm, preferably 0.10 to 0.20 mm, in particular 0.12 to 0.18 mm. The arrangement according to the invention can be limited to individual ones of the above-mentioned or calculated value ranges of the parameters Ri, Ra, OW, MWI and RT or any combinations thereof. Preferably, all of the above-mentioned parameters Ri, Ra, OW, MWI are limited to the above-mentioned or calculated value ranges, in particular to the respectively preferred or particularly preferred value ranges. According to the embodiments of the arrangement according to the invention described above, the radius Ra of the radial webs RS is determined according to the above first equation (GL1) or second equation (GL2).This ensures that, when the arrangement according to the invention is used in a grinding mechanism with two parallel disc arrangements according to the invention, on the one hand, the radial webs RS of one arrangement and the radial grooves RN of the other, parallel arrangement (and vice versa) do not touch each other, and, on the other hand, the predetermined grinding gap does not increase due to material wear during intended use, or does not increase as quickly as with conventional arrangements, thereby avoiding any deviation from the desired or preset degree of comminution or from the desired grist sorting even over a longer period of use. Furthermore, these embodiments ensure that the grinding gap MS in the area of ​​the radial web edges is smaller than the grinding gap along the surface line or flank of the respective disc S.This effectively prevents excessively coarse particles or even entire grains from passing through the grinding gap in the area of ​​the rounded edges. Only with the advent of modern machining techniques, particularly CNC milling technology, has it become possible to produce the disc assemblies according to the invention with rounded edges and groove bases precisely and affordably. However, this still requires additional machining effort compared to the production of conventional disc assemblies with pointed edges and groove bases.

[0033] Furthermore, the arrangement A can have a first end section F1 at a first end E1. The first end section F1 has the shape of a cylinder or hollow cylinder. The first end section F1 is arranged such that its central axis MF1 is parallel or coaxial with the central axis MA of the arrangement A. The first end section F1 preferably has a length (= thickness) measured in the direction of the central axis MA of the arrangement A of 1 to 100 mm, preferably 1 to 50 mm, in particular 2 to 20 mm. The diameter of the first end section F1 preferably corresponds to the diameter of the disk SR1 of the arrangement A adjacent to the first end section F1 at the first end E1 of the arrangement A (= the diameter of the outer edge of the disk SRI adjacent to the first end section F1). The disk SRI is the outermost disk of the arrangement A arranged at the first end E1.It is preferred if the diameter of the first end section F1 is not larger than the diameter of the disc SR1 of the arrangement A adjacent to the first end section F1 at the first end E1 of the arrangement A. This achieves sufficient mechanical stability with the lowest possible material usage.

[0034] The inventors of the present invention have recognized, based on their own observations, that the ends of the disc assemblies in conventional grinding mills represent structural weak points where chipping can occur due to foreign matter in the material being ground. By reinforcing the inventive assembly at at least one end, or better yet, at both ends, with a cylindrical end section, these chippings at the respective end region of the assembly are prevented when the inventive assembly is used in a grinding mill.

[0035] In this embodiment, it is particularly advantageous if the first end section F1 is connected in a force-fitting, form-fitting, or material-fitting manner to the disc SRI of the arrangement A arranged adjacent to the first end section F1. Alternatively, the first end section F1 can be integral with the adjacently arranged disc SRI.

[0036] Furthermore, the arrangement A can have a second end section F2 at a second end E2. The second end section F2 has the shape of a cylinder or hollow cylinder. The second end section F2 is arranged such that its central axis MF2 is parallel or coaxial with the central axis MA of the arrangement A. The second end section F2 preferably has a length (= thickness) measured in the direction of the central axis MA of the arrangement A of 1 to 100 mm, preferably 1 to 50 mm, in particular 2 to 20 mm. The diameter of the second end section F2 preferably corresponds to the diameter of the disk SR2 of the arrangement A adjacent to the second end section F2 at the second end E2 of the arrangement A (= the diameter of the outer edge of the disk SR2 adjacent to the second end section F2). The disk SR2 is the outermost disk of the arrangement A arranged at the second end E2.It is preferred if the diameter of the second end section F2 is not larger than the diameter of the disc SR2 of the arrangement A adjacent to the second end section F2 at the second end E2 of the arrangement A. In this case, the advantages listed above for the first end section F1 apply analogously.

[0037] In this embodiment, it is also particularly advantageous if the second end section F2 is connected in a force-fitting, form-fitting, or material-fitting manner to the disc SR2 of the arrangement A arranged adjacent to the second end section F2. Alternatively, the second end section F2 can be integral with the adjacent disc SR2.

[0038] The same material as the disks of the assembly is preferably used for the first end section F1 and / or the second end section F2. However, a material with greater hardness can also be used. A particularly high mechanical reinforcement effect is achieved if the first end section F1 and / or the second end section F2 is / are made of solid material.

[0039] The object of the invention is further achieved by the subject matter of claim 10.

[0040] Thus, a grinding mechanism MW for a mill is claimed, which comprises at least: a first roller WA1, comprising a first shaft W1 and a first arrangement A1; and a second roller WA2, comprising a second shaft W2 and a second arrangement A2; wherein the first shaft W1 and the first arrangement A1 are connected to one another in a force-fitting, form-fitting or material-fitting manner or are integral; wherein the second shaft W2 and the second arrangement A2 are connected to one another in a force-fitting, form-fitting or material-fitting manner or are integral; wherein the first arrangement A1 comprises an arrangement A according to one of claims 1 to

[0041] 9; wherein the second arrangement A2 is an arrangement A according to one of claims 1 to 9; wherein the central axis MA1 of the first arrangement A1 is arranged parallel to the central axis MA2 of the second arrangement A2; wherein the radial webs RS1 of the first arrangement A1 engage in the radial grooves RN2 of the second arrangement A2; and wherein the radial webs RS2 of the second arrangement A2 engage in the radial grooves RN1 of the first arrangement A1.

[0042] Since the grinder according to the invention provides at least two arrangements according to the invention, the advantages discussed above in connection with the arrangement according to the invention apply analogously to the grinder according to the invention. Preferably, in the grinder according to the invention, the first arrangement A1 and the second arrangement A2 each have the same values ​​for the above-defined parameters Ri, Ra, MWI, OW, RT, diameter of the discs S and thickness of the discs S. Particularly preferably, in the grinder according to the invention, the first arrangement A1 and the second arrangement A2 are identical. Particularly preferably, in the grinder according to the invention, the first roller WA1 and the second roller WA2 are identical.

[0043] Particularly preferably, in the grinding mechanism according to the invention, the first roller WA1 and the second roller WA2 or the first arrangement A1 and the second arrangement A2 are arranged in opposite directions.

[0044] In the grinding mechanism according to the invention, a gap is formed between the first arrangement A1 and the second arrangement A2, which gap is referred to as grinding gap MS.

[0045] In the grinding mechanism according to the invention, the distance between the central axis MA1 of the first arrangement A1 and the central axis MA2 of the second arrangement A2 (= axial distance of the grinding mechanism) is determined based on the diameters of the discs of the first arrangement A1 and of the second arrangement A2 and the desired grinding gap MS.

[0046] In the grinding mechanism according to the invention, the grinding gap MS in the area of ​​the radial web edges, i.e., in the area where the rounding is present, or a portion of this area, is preferably smaller than the grinding gap MS along the surface line or flank of the respective disc S, i.e., the linear area between the radial web edge and the groove base of the radial groove RN arranged adjacent to this radial web RS. This effectively prevents excessively coarse particles or even entire grains from passing through the grinding gap MS in the area of ​​the rounded edges.

[0047] Advantageous embodiments of the grinder according to the invention are the subject of the dependent claims.

[0048] Thus, in one embodiment, the central axis MA1 of the first arrangement A1 can be arranged coaxially with the central axis of the first shaft W1. The central axis MA2 of the second arrangement A2 is arranged coaxially with the central axis of the second shaft W2.

[0049] This arrangement facilitates the assembly and adjustment of the grinding mechanism according to the invention, such as the roller spacing and thus the grinding gap.

[0050] In a further embodiment, the first shaft W1 and the second shaft W2 can be arranged relative to one another such that the center axis of the first shaft W1 and the center axis of the second shaft W2 are arranged parallel to one another. A gap referred to as the grinding gap MS is formed between the first arrangement A1 and the second arrangement A2.

[0051] In the grinding mechanism according to the invention, the grinding gap MS has a clear width of 0.10 to 1.40 mm, preferably 0.10 to 0.80 mm, preferably 0.10 to 0.50 mm, preferably 0.20 to 0.60 mm, in particular 0.20 to 0.40 mm, over its entire length. The object of the invention is finally achieved by the use according to claim 14.

[0052] Thus, the use of at least one arrangement A according to one of claims 1 to 9 or a grinding mechanism according to one of claims 10 to 13 for comminuting a ground material is claimed. The ground material is a plant material, preferably a protein-containing plant material, or contains it. The ground material is preferably selected from a group consisting of: malt, unmalted grain, barley, rice, corn, millet, chickpeas, soy, potatoes, and any mixture thereof. The ground material is preferably a raw material suitable for food or beverage production, preferably for beer production, or any mixture of such raw materials.

[0053] By the inventive use of the arrangement according to the invention or the grinding mechanism according to the invention for comminuting plant material, in particular the plant materials mentioned above, the disadvantages discussed at the beginning in connection with the prior art can be avoided and the comminution levels desired by the user can be achieved without disadvantageous local enlargements of the grinding gap in the region of the radial groove base occurring.

[0054] Further revelation

[0055] The following table shows the parameters discussed above in connection with the invention and exemplary, non-limiting numerical values ​​for these:

[0056] Examples of embodiments of the prior art and the arrangement according to the invention are the subject of the attached drawing. Therein:

[0057] Fig. 1 is a schematic, not to scale representation (top view) of a conventional grinder with two parallel, conventional disc arrangements, each having radial webs with a tapered edge and a corresponding tapered V-groove of the radial grooves;

[0058] Fig. 2 is an enlarged view of the engagement of the radial web RS of one conventional arrangement into the radial groove of the other conventional

[0059] Arrangement corresponding to the circular section of Fig. 1; Fig. 3 is a schematic, not-to-scale representation (top view) of a grinding mechanism according to the invention with two parallel arrangements according to the invention with a plurality of discs, wherein the radial webs are rounded at their edges and the radial grooves have rounded groove bases;

[0060] Fig. 4 is an enlarged view of the engagement of the radial web RS of one arrangement according to the invention in the radial groove of the other arrangement according to the invention, which corresponds to the circular section of Fig. 3;

[0061] Fig. 5 is a further enlarged view of the procedure shown in Fig. 4;

[0062] Fig. 6 is a schematic, not to scale, representation of an arrangement according to the invention with a plurality of discs, wherein the radial webs are rounded at their edges and the radial grooves have a rounded groove base shape; and

[0063] Fig. 7 is a schematic, not to scale, representation of an arrangement according to the invention with a plurality of discs, the arrangement having a cylindrical end portion at one end.

[0064] Fig. 1 shows a conventional grinding mill HMW equipped with two rollers HWA1, HWA2. Each of the rollers HWA1, HWA2 consists of a rotatably mounted shaft HW1, HW2, on which an arrangement HA1, HA2 of discs HS1, HS2 is arranged. In this example, the conventional discs HS1, HS2 have a truncated cone or double truncated cone shape and are each stacked along the central axis HMA1, HMA2 of the arrangement HA1, HA2. The two arrangements HA1, HA2 of conventional design each have a plurality of radial webs HRS1, HRS2 and radial grooves HRN1, HRN2. The radial webs HRS1 of the first arrangement (HA1) engage in the radial grooves HRN2 of the second arrangement HA2 and vice versa. In the conventional arrangements, the radial webs HRS1, HRS2 have pointed edges HKT1, HKT2 and the radial grooves HRN1, HRN2 have tapered, V-shaped groove bases, as can be seen particularly in the enlarged engagement illustration in Fig.2. The grinding gap HMS is formed between the two conventional arrangements HA1, HA2, or more precisely, between the radial webs that are arranged adjacent to one another when the two arrangements IIA1, IIA2 are engaged. The radial grooves HRN1, HRN2 each have an opening angle OW1, OW2, which is indicated as OW1 in Fig. 1 by way of example. Each of the disks HS1, HS2 encloses an angle MWI1, MWI2 between a generator line of the disk HS1, HS2 and the respective cone axis KA1, KA2 of the disks HS1, HS2, whereby only the angle MWI1 is indicated in Fig. 1. In Fig. 1, the cone axes KA1 coincide with the central axis HMA1 of the arrangement HA1. Correspondingly, the cone axes KA2 coincide with the central axis HMA2 of the arrangement HA2.

[0065] In contrast, Fig. 3 shows a grinding mechanism MW according to the invention with a first roller WA1 and a second roller WA2. The first roller WA1 has a first shaft W1 and a first arrangement A1 according to the invention. Correspondingly, the second roller WA2 has a second shaft W2 and a second arrangement A2 according to the invention. The first roller WA1 and the second roller WA2 are rotatably mounted and can rotate in opposite directions during operation of the grinding mechanism. The grinding gap MS of the grinding mechanism MW according to the invention is formed between the first arrangement A1 and the second arrangement A2 (only shown in Fig. 5). The first arrangement A1 consists of a plurality of first discs S1, each of the first discs S1 having either a truncated cone or a double truncated cone shape.More precisely, only the first disk S1 arranged at the left end of the first arrangement A1 in Figure 3 has a conical step shape, while the remaining first disks S1 have a double truncated cone shape. The first disks S1 are arranged stacked along a first central axis MA1 of the first arrangement A1. A first conical axis KA1 of each first disk S1 is arranged coaxially to the first central axis MA1 of the first arrangement A1. The first arrangement A1 has a plurality of first radial webs RS1 pointing away from the first central axis MA1 of the first arrangement A1. Between two adjacent first radial webs RS1, a first radial groove RN1 is formed each pointing towards the first central axis MA1 of the first arrangement A1. In contrast to the prior art, the first radial grooves RN1 according to the invention each have a rounded, concave groove base NG1, which can be seen in the enlarged views of Fig.4 and 5. Furthermore, the first radial webs RS1 each have a rounded, convex first edge KT1. In the illustrated embodiment of the arrangement according to the invention, for each of the first disks S1, the angle MWI1 between a surface line of the first disk S1 and a first conical axis KA1 of the first disk S1 is approximately 81°. The opening angle OW1 of the first radial grooves RN1 is correspondingly approximately 18°.

[0066] The second arrangement A2 according to the invention is constructed identically to the first arrangement A1 described above, so a detailed description is omitted here. The second arrangement A2 according to the invention is arranged parallel to, but opposite to, the first arrangement A1 (see Fig. 3).

[0067] The enlarged view of Fig. 5 also shows the radius Ri of the radial groove RN1 at the rounded groove base NG1 and the radius Ra of the radial web RS2 at the rounded edge KT2, wherein the radius Ri of the radial groove RN1 is greater than the radius Ra of the radial web RS2 at the rounded edge KT2. Furthermore, this figure shows that in the embodiment according to the invention, the grinding gap MS in the region of the radial web edges KT2 is smaller than the grinding gap MS along the surface line or flank of the disk S. This effectively prevents excessively coarse particles or even entire grains from passing through the grinding gap in the region of the rounded edges.

[0068] The arrangement A according to the invention, which is identical to the arrangement A1 according to the invention, is shown again separately in Fig. 6.

[0069] Fig. 7 shows an arrangement according to the invention which is essentially identical to the previously described arrangements A according to Fig. 6 and A1 according to Fig. 3. Therefore, only the differences from the embodiment of Figs. 3 and 6 are described below. Thus, the arrangement A according to the invention in Fig. 7 has a first end section F1 (shown hatched) at a first end E1, which has the shape of a cylinder and is made of solid material. The central axis MF1 of the first end section F1 is arranged coaxially to the central axis MA of the arrangement A. In the example shown, the first end section F1 is materially connected to the disk SRI of the arrangement A, which is arranged adjacent to the first end section F1. However, the invention is not limited to this, but can alternatively or additionally have a second end section F2 at a second end E2 of the arrangement A (not shown in Fig. 7).The length (= thickness) of the first end section F1 measured in the direction of the central axis MA of the arrangement A is, for example, 5 mm.

[0070] The provision of the described first end section F1 and / or the second end section F2 advantageously increases the mechanical stability of the arrangement according to the invention at one or both ends of the arrangement A according to the invention.

Claims

Claims 1. An arrangement (A) comprising or consisting of a plurality of disks (S); wherein each of the disks (S) has a frustoconical or double conical or double frustoconical shape; wherein, in each of the disks (S), the angle (MWI) between a generatrix of the disk (S) and a cone axis (KA) of the disk (S) is > 30 to 82.5°, preferably 40 to 75°; wherein the disks (S) are stacked along a central axis (MA) of the arrangement (A); wherein the disks (S) are arranged such that the cone axis (KA) of each disk (S) is parallel or coaxial to the central axis (MA) of the arrangement (A); wherein the arrangement (A) has a plurality of radial grooves (RN) pointing towards the central axis (MA) of the arrangement (A); wherein the arrangement (A) has a plurality of radial webs (RS) pointing away from the central axis (MA) of the arrangement (A);characterized in that the radial grooves (RN) each have a rounded groove base (NG); and the radial webs (RS) each have a rounded edge (KT).

2. Arrangement (A) according to claim 1, wherein the radial grooves (RN) point perpendicular to the central axis (MA) of the arrangement (A); and / or wherein the radial webs (RS) point perpendicularly away from the central axis (MA) of the arrangement (A).

3. Arrangement (A) according to claim 1 or 2, wherein the radius (Ri) of the radial grooves (RN) at the rounded groove base (NG) is larger than the radius (Ra) of the radial webs (RS) at the rounded edge (KT).

4. Arrangement (A) according to any one of claims 1 to 3, wherein the disks (S) have a diameter of 50 to 500 mm, preferably 100 to 400 mm; and / or wherein the disks (S) have a thickness of 40 to 200 mm, preferably 50 to 80 mm.

5. Arrangement (A) according to any one of claims 1 to 4, wherein the radius (Ri) of the radial grooves (RN) at the rounded groove base (NG) is 0.5 to 25 mm, preferably 1 to 20 mm, in particular 2 to 10 mm; and / or wherein the radius (Ra) of the radial webs (RS) at the rounded edge (KT) is determined according to the following first equation (GL1): Ra = Ri - 2 * MS + RT (GL1) where Ra = radius (Ra) of the radial webs (RS) at the rounded edge (KT) in mm; Ri = radius (Ri) of the radial grooves (RN) at the rounded groove base (NG) in mm; MS = grinding gap in mm; and RT = runout tolerance in mm; and where the grinding gap (MS) has a value of 0.10 to 1.40 mm, preferably 0.10 to 0.80 mm, preferably 0.10 to 0.50 mm, preferably 0.20 to 0.60 mm, in particular 0.20 to 0.40 mm; and where the runout tolerance (RT) has a value of 0.05 to 0.30 mm, preferably 0.10 to 0.20 mm, in particular 0.12 to 0.18 mm.

6. Arrangement (A) according to any one of claims 1 to 5, wherein the arrangement (A) has a first end section (F1) at a first end (El); wherein the first end section (F1) has the shape of a cylinder or hollow cylinder; wherein the first end section (F1) is arranged such that its central axis (MF1) is arranged parallel or coaxial to the central axis (MA) of the arrangement (A); and wherein the first end section (F1) preferably has a length of 1 to 100 mm, preferably of 1 to 50 mm, in particular of 2 to 20 mm, measured in the direction of the central axis (MA) of the arrangement (A).

7. Arrangement (A) according to claim 6, wherein the first end section (F1) is connected by force, form or material connection to a disk (SRI) of the arrangement (A) arranged adjacent to the first end section (F1) or is integral with it.

8. Arrangement (A) according to claim 6 or 7, wherein the arrangement (A) has a second end section (F2) at a second end (E2); wherein the second end section (F2) has the shape of a cylinder or hollow cylinder; wherein the second end section (F2) is arranged such that its central axis (MF2) is arranged parallel or coaxial to the central axis (MA) of the arrangement (A); and wherein the second end section (F2) preferably has a length of 1 to 100 mm, preferably 1 to 50 mm, and in particular 2 to 20 mm, measured in the direction of the central axis (MA) of the arrangement (A).

9. Arrangement (A) according to claim 8, wherein the second end section (F2) is connected by force, form or material connection to a disk (SR2) of the arrangement (A) arranged adjacent to the second end section (F2) or is integral with it.

10. Grinding mechanism (MW) for a mill, comprising at least: a first roller (WA1) comprising a first shaft (Wl) and a first arrangement (A1); and a second roller (WA2) comprising a second shaft (W2) and a second arrangement (A2); wherein the first shaft (Wl) and the first arrangement (A1) are connected to each other by force-fit, form-fit, or material-fit, or are integral parts; wherein the second shaft (W2) and the second arrangement (A2) are connected to each other by force-fit, form-fit, or material-fit, or are integral parts; wherein the first arrangement (A1) is an arrangement (A) according to any one of claims 1 to 9; wherein the second arrangement (A2) is an arrangement (A) according to any one of claims 1 to 9; wherein the central axis (MA1) of the first arrangement (A1) is arranged parallel to the central axis (MA2) of the second arrangement (A2); wherein the radial webs (RS1) of the first arrangement (A1) engage in the radial grooves (RN2) of the second arrangement (A2);and wherein the radial webs (RS2) of the second arrangement (A2) engage in the radial grooves (RN1) of the first arrangement (A1).

11. Grinding mill according to claim 10, wherein the central axis (MA1) of the first arrangement (A1) is arranged coaxially with the central axis of the first shaft (W1); and wherein the central axis (MA2) of the second arrangement (A2) is arranged coaxially with the central axis of the second shaft (W2).

12. Grinding mill according to claim 10 or 11, wherein the first shaft (W1) and the second shaft (W2) are arranged relative to each other such that the central axis of the first shaft (W1) and the central axis of the second shaft (W2) are parallel to each other; and; wherein a gap, designated as the grinding gap (MS), is formed between the first arrangement (A1) and the second arrangement (A2); and wherein the grinding gap (MS) has a clear width of between 0.10 and 1.40 mm, preferably 0.10 to 0.80 mm, preferably between 0.10 and 0.50 mm, preferably 0.20 to 0.60 mm, and in particular between 0.20 and 0.40 mm, over its entire length. Grinding mill according to any one of claims 10 to 12, wherein the first roller (WA1) or the first shaft (W1) is rotatably mounted; and wherein the second roller (WA2) or the second shaft (W2) is rotatably mounted; and wherein the first roller (WA1) and the second roller (WA2) are rotatable in opposite directions.Use of at least one arrangement (A) according to one of claims 1 to 9 or of a grinding mill according to one of claims 10 to 13 for grinding a material to be ground; wherein the material to be ground is or contains a plant material, preferably a protein-containing plant material; and wherein the material to be ground is preferably selected from the group consisting of: malt, unmalted grain, rice, maize, millet, chickpea, soybean, potato and any mixture thereof.

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