Laboratory grinding machine, grinding cup and assembly with laboratory grinding machine and grinding cup

Abstract

The utility model relates to a laboratory grinding machine, in particular a centrifugal ball mill and / or a planetary ball mill, comprising at least one grinding cup holder for at least one grinding cup (2) and at least one anti-rotation means, the at least one anti-rotation device is used for holding the grinding cup (2) in a defined and preset position relative to the grinding cup holder and / or is used as a positioning aid. According to the invention, the grinding cup holder has at least one surface relief as an anti-rotation means on an axial surface (4) facing the grinding cup bottom in the grinding mode, the at least one surface undulation can be connected in a form-fitting manner with a mating undulation on the axial surface (10) of the grinding cup bottom and complementary to the surface undulation to form an anti-rotation mechanism. In addition, a grinding cup and an assembly having a laboratory grinder and a grinding cup are provided.

Description

Technical Field

[0001] This application relates to a laboratory grinder, particularly a centrifugal ball mill and / or a planetary ball mill, comprising: at least one grinding cup holder for holding and / or receiving at least one grinding cup, and at least one anti-rotation device for holding the grinding cup in a defined, predetermined position relative to the grinding cup holder and / or for use as a positioning aid.

[0002] Furthermore, this application relates to a grinding cup for a laboratory grinder of the above type, and an assembly having a laboratory grinder and at least one grinding cup. Background Technology

[0003] In a centrifugal ball mill, the grinding cups are eccentrically arranged relative to the drive axis of the mill and thus move along a circular path about the drive axis. In this centrifugal ball mill, rotation of the grinding cups about their own axis is prevented. In contrast, in a planetary ball mill, the grinding cups additionally rotate about their own axis, thus forming a planetary transmission having a sun gear that rotates about the central axis of the mill housing and at least one planetary gear arranged thereon, carrying the grinding cups, driven, and revolving about the axis of the sun gear.

[0004] In such a grinder, the grinding cup is loaded outside the grinder before each grinding cycle begins, then sealed by means of a placed cover, and subsequently placed, for example, in the grinding cup receiving section of a grinding cup holder. Before starting the grinder by activating the drive unit, the grinding cup is secured to the grinding cup holder by means of a pre-tightening device that is installed on the grinding cup after it is placed in the grinding cup receiving section, thereby ensuring that the grinding cup is reliably secured even under significant centrifugal force without posing any danger to the operator.

[0005] A laboratory grinder of this type, resembling a planetary ball mill, is known from DE 4237055 C1. It comprises a housing with a bottom for holding and receiving the grinding cup. The housing is positioned and secured on a rotating clamping disc, which is part of a rotating sun gear. Each housing has vertical connecting plates on the side of the grinding cup, these plates having openings to receive a multi-armed, star-shaped support (spinne) that covers the grinding cup. A locking bolt engages through the star-shaped support; this locking bolt can be rotated via a handle and presses the grinding cup against the bottom of the housing. As a means of securing and positioning the inserted grinding cup, it can be specified that the bottom of the housing has a pin engaging with the bottom of the grinding cup, wherein the pin is eccentrically positioned along a receiving axis in the bottom of the housing and has a blind hole at the corresponding position on the grinding cup. The pin serves as an anti-rotation device. Thus, the grinding cup is fixed relative to the bottom of the housing in a form-fit manner, thereby resisting movement of the grinding cup.

[0006] The rotational motion during planetary ball mill operation generates significant forces, causing the anti-rotation pins, which engage with the bottom of the grinding cup, to bear substantial pressure per unit area and thus experience severe wear. Wear can lead to bending or even breakage of the anti-rotation pins, resulting in the grinding cup no longer being reliably secured relative to the bottom of the housing. Furthermore, as wear increases, precise positioning of the grinding cup when inserted into the housing becomes difficult. Summary of the Invention

[0007] The purpose of this application is to provide a laboratory grinder, a grinding cup, and an assembly of the type described in the opening paragraph, which ensure that the grinding cup is reliably and morphologically fixed to, in, and / or on the grinding cup holder with low pressure per unit area and reduced wear of at least one anti-rotation device for fixing the grinding cup, and enable precise positioning of the grinding cup relative to the grinding cup holder in a simple manner.

[0008] According to this application, the above objective is achieved by a laboratory grinder according to this application and a grinding cup according to this application.

[0009] According to the provisions of this application: the grinding cup holder has at least one surface relief or surface topography on the axial surface facing the bottom of the grinding cup in the grinding mode as an anti-rotation device, which can be connected to the mating relief or the corresponding complementary surface topography on the axial surface of the bottom of the grinding cup in a form-position fit to prevent rotation.

[0010] Correspondingly, in the grinding cup according to this application, a surface undulation is provided on the axial surface of the grinding cup holder facing the laboratory grinder in grinding mode at the bottom of the grinding cup as an anti-rotation device. The surface undulation can be connected to a matching undulation on the axial surface of the grinding cup holder in a form-fit manner to form an anti-rotation mechanism.

[0011] According to this application, the anti-rotation mechanism of the grinding cup is thus achieved by complementary undulations or profiles on the bottom surface of the grinding cup and on the top surface of the facing grinding cup holder.

[0012] In the sense of this application, the terms "surface undulation" and "fitting undulation" should be interpreted as synonymous.

[0013] According to this application, a specific surface profile or anti-rotation geometry is provided on the axially upward-oriented surface of the grinding cup holder facing the grinding cup, and a complementary surface profile is provided on the axially downward-oriented surface of the grinding cup bottom facing the grinding cup holder, in order to prevent the grinding cup from rotating relative to its central axis in the connected state (i.e., after the surface profiles or anti-rotation geometry on the surfaces of the grinding cup holder and the grinding cup bottom facing each other are at least partially connected in a form-fit manner). When the grinding cup is arranged on the grinding cup holder or placed in the grinding cup holder, the undulating surface areas of the grinding cup bottom and the grinding cup holder at least partially engage with each other and / or abut against each other in the circumferential direction, thereby forming a form-fit in the circumferential direction to prevent the grinding cup from rotating relative to the grinding cup holder about the axial central axis of the grinding cup.

[0014] To ensure that the grinding cup does not rotate relative to the grinding cup holder, the surface undulation and the mating undulation have suitable and complementary undulation orientations in the circumferential direction of the grinding cup, that is, they work together in the sense of preventing rotation and are related to the outer edge of the undulation.

[0015] Effective anti-rotation surfaces for surface undulations or surface morphology on the grinding cup holder and grinding cup are formed by axially planar segments extending in the axial direction (i.e., along the central axis of the grinding cup) on the surfaces of the grinding cup holder and the grinding cup facing each other in grinding mode. These planar segments prevent the grinding cup from rotating relative to the grinding cup holder or achieve circumferential positioning when the grinding cup is placed in or arranged on the grinding cup holder.

[0016] In the prior art, the anti-rotation pin, which is the only anti-rotation device, suffers significant wear during the operation of a laboratory grinder due to its small anti-rotation surface. The anti-rotation surface of the pin is formed by its columnar outer surface. By using the surface undulations or surface morphology provided according to this application on the surfaces of the grinding cup holder and the grinding cup facing each other in grinding mode, the effective anti-rotation surface can be significantly increased compared to the effective anti-rotation surface or outer surface of the anti-rotation pin. This reduces the pressure per unit area and thus reduces the wear on the effective anti-rotation surface. By using the axial plane segment located on the surfaces of the grinding cup holder and the grinding cup facing each other in grinding mode, which, according to this application, works together in the circumferential direction to form a form-fit, the grinding cup is fixed relative to the bottom of the grinding cup holder in a form-fit manner for a long period of use, even under high centrifugal force, and resists the movement of the grinding cup with high reliability.

[0017] In the sense of this application, the surface undulations are preferably formed by at least one planar region that is recessed or protruding in the axial direction relative to adjacent surface regions, wherein when the grinding cup is arranged on or within the bottom of the grinding cup holder, at least one recessed or protruding planar region on the axial surface of the grinding cup bottom engages with at least one protruding or recessed planar region on the axial surface of the grinding cup holder. Here, the complementary geometry of the undulations or the complementary contour orientation of the outer edges of the undulations are selected such that the grinding cup does not rotate relative to the grinding cup holder after the recessed and protruding planar regions on the grinding cup bottom and the holding device engage with each other.

[0018] Particularly preferably, the undulating surface is integrally transitioned into the adjacent surface of the grinding cup bottom or grinding cup holder, or the undulating surface is formed in the surface of the grinding cup bottom or grinding cup holder.

[0019] More preferably, the surface undulation has a flat undulation surface. The planar region forming the undulation, whether recessed or protruding, can have a constant height or depth relative to the adjacent (flat) surface region of the grinding cup holder or grinding cup over the entire undulation extension dimension, particularly wherein the height or depth can be between 1 and 5 mm, for example, 2 mm.

[0020] To provide a sufficiently large anti-rotation surface and to reduce wear at the surface undulations during grinding, the surface undulations may extend at least 30° of rotation about the central axis of the grinding cup in the circumferential direction relative to the outer edge of the undulations, preferably at least 60°, and especially 180° or greater. However, particularly preferably, the surface undulations are formed by recesses or protrusions that continuously surround or close themselves around the entire circumference of the grinding cup. However, multiple recesses or protrusions that are separated from each other may also be provided to form undulations or anti-rotation profiles on the bottom of the grinding cup and / or the grinding cup holder.

[0021] In a top view of the undulating surface, or in a cross-section transverse to the central axis of the grinding cup (relative to the arrangement of the grinding cup in the holding device during operation of the laboratory grinder), in a cross-sectional view cutting through the undulating surface, the undulating surface can have any contour orientation of its radially inward or radially outward longitudinal or outer edge, as long as the circumferential fit of the undulating surface ensures that rotation of the grinding cup is prevented when interacting with the mating undulating surface. For this purpose, in a top view of the undulating surface, the contour orientation of at least one outer edge of the undulating surface can deviate from a strictly circular shape and / or a strictly annular shape; in particular, the outer edge has at least one local curvature characteristic variation in the circumferential direction; and in particular, the outer edge forms a recessed notch to form a circumferential fit with the mating undulating surface.

[0022] In principle, the surface undulation can have any undulation geometry predetermined by the orientation of its longitudinal or outer edge in the circumferential direction. Particularly preferred is that the undulation geometry approximates a multi-tooth geometry, wherein the contour lines of the longitudinal or outer edge of the surface undulation form multiple teeth or notches. These teeth or notches can interact with complementary teeth or notches of the mating undulation to form a morphologically fitted connection acting in the circumferential direction. This design of the undulation facilitates force distribution and ensures a wider stress distribution area for the forces generated by the rotational motion of the components in the grinding mode of a laboratory grinder. A flower-shaped geometry is also possible.

[0023] When the surface undulations have a wavy orientation in the circumferential direction (preferably at least partially) on their radially inner and / or radially outer longitudinal or outer edges, they can achieve particularly advantageous wear characteristics and serve as a positioning aid when placing or arranging the grinding container in or on the bottom of the grinding cup holder.

[0024] Tests conducted in accordance with this application have shown that the particularly advantageous wear characteristics of the surface undulations can be achieved when, in a top view of the undulating surface and in terms of the orientation of the radially inward and / or radially outward longitudinal or outer edge of the surface undulations in the circumferential direction, the surface undulations are flower-shaped or star-shaped, and have a plurality of successive radial protrusions and radial recesses in the circumferential direction. In particular, at least three radial protrusions can be provided, and more particularly, between four and six radial protrusions can be provided. The protrusions and recesses form relief nocken, which enable the grinding cup to be placed in and / or arranged on the grinding cup holder only at a defined position relative to the grinding cup holder. This provides an operational advantage, particularly for the pre-tightening device (which has a star-shaped bracket that can be fixed to the grinding cup holder as a support for the spindle for pre-tightening the grinding cup to the grinding cup holder), because the star-shaped bracket can be pre-positioned in a simple and precise manner. The undulating surface of a flower-shaped or star-shaped surface with protrusions and multiple teeth is beneficial for force distribution in situations where the force is applied over a wide area.

[0025] The surface undulations can have rounded edges and circumferential surfaces to facilitate a form-fit connection with the mating undulations. If the surface undulations are designed in a flower or star shape and have multiple undulation protrusions and undulation valleys arranged therebetween, the undulations can have a smoothed circumferential profile in the areas of the undulation protrusions and / or in the areas of the undulation valleys. This results in a surface with high wear resistance.

[0026] To facilitate centering the grinding cup when it is placed in or on the bottom of the grinding cup holder, at least one centering undulation may be formed on the surface of the grinding cup holder and / or on the surface of the grinding cup bottom and / or on the grinding cup bottom. When a form-fitting connection is formed between the surface undulation and the mating undulation, the centering undulation works in conjunction with the complementary centering undulation on the grinding cup bottom or the holding device to center the grinding cup relative to the holding device.

[0027] For example, a recessed planar region (centering recess) can be provided on the axial surface of the grinding cup holder facing the bottom of the grinding cup in grinding mode. When the grinding cup is placed into the bottom of the grinding cup holder or placed on it, this recessed planar region and a centrally located protruding planar region (centering protrusion) on the surface of the bottom of the grinding cup are connected in a form-fit manner. In particular, the centering recess or centering protrusion can be formed by a centrally located, especially circular, flat planar section of the axial surface.

[0028] Particularly preferably, the central, especially circular, flat planar section of the axial surface can be configured as a centered protrusion or a centered recess, the planar section being (preferably completely) defined and / or surrounded by surface undulations, particularly in a ring-like manner, wherein the surface undulations serve as an anti-rotation device in the manner described above.

[0029] In addition to the anti-rotation means achieved according to this application through complementary surface undulations on the grinding cup holder and the bottom of the grinding cup (wherein the undulations are designed to hold the grinding cup in a defined, predetermined position relative to the axis of rotation and / or are designed as positioning aids), additional anti-rotation means can be provided by at least one anti-rotation element (in particular an anti-rotation pin). Specifically, the anti-rotation element can be provided in the planar region of the surface undulations to form a form-fit connection between the grinding cup holder and the grinding cup. At least one anti-rotation pin can be provided, engaging parallel to the central axis of the grinding cup into a hole formed in the planar section of the surface undulations. If the surface undulations are designed, for example, in a flower or star shape and have multiple undulation protrusions and undulation valleys arranged therebetween, holes can be provided in the regions of the undulation protrusions to receive the retaining pin.

[0030] Although the increased effective anti-rotation surface of the surface undulations provided as an anti-rotation device according to this application improves wear resistance compared to a circular shape, the surface undulations will still wear down over time. Therefore, in a preferred embodiment of this application, the surface undulations can be formed on an undulation molded part that is detachably connected to a holding device or a grinding cup, which allows the undulation molded part to be replaced as needed according to the wear condition. Attached Figure Description

[0031] Other advantages, features, characteristics, and aspects of this application arise from the following description of preferred embodiments based on the accompanying drawings, wherein features of these embodiments can be combined with each other. In the drawings:

[0032] Figure 1 The arrangement of the grinding cups according to this application on the disc-shaped bottom of the grinding cup holder (not shown in detail) of the laboratory grinder (especially a planetary ball mill) according to this application, which is arranged and / or placed in the grinder according to this application, is shown in a perspective view from an oblique top view.

[0033] Figure 2 Shown from below Figure 1 A view of the bottom of the grinding cup;

[0034] Figure 3 It shows Figure 1 Top view of the bottom of the grinding cup holder;

[0035] Figure 4This shows a view from a slightly below angle before the grinding cup is placed on or inside the bottom. Figure 1 A perspective view of the bottom of the arrangement and the grinding cup shown;

[0036] Figure 5 This shows a view from an oblique angle before the grinding cup is placed on or inside the bottom. Figure 1 A perspective view of the bottom of the arrangement and the grinding cup shown;

[0037] Figure 6 A second embodiment of the grinding cup according to this application is shown in a perspective view viewed from an oblique downward angle; and

[0038] Figure 7 A third embodiment of the grinding cup according to this application is shown in a perspective view viewed from an oblique downward angle. Detailed Implementation

[0039] Figure 1 The image shows an arrangement of a disc-shaped bottom 1 (not shown in detail) of a grinding cup holder for at least one grinding cup 2 of a laboratory grinder (particularly a planetary ball mill). The grinding cup holder may provide a holding and / or receiving device as described in DE20 2008 008 473 U1, wherein the grinding cup 2 can be arranged on the bottom 1 and can be secured by means of a pre-tightening device comprising a star-shaped bracket that can be secured to a grinding cup receiving portion connected to the bottom 1 of the grinding cup holder and serves as a support for a spindle that presses the grinding cup 2 onto the bottom 1.

[0040] The spatial geometry of the grinding cup holder may also differ from the holding and / or receiving device shown and described in DE 20 2008 008 473 U1. Importantly, the grinding cup holder is provided and designed for holding or securing at least one grinding cup 2 of a laboratory grinder.

[0041] exist Figures 1 to 5 In the embodiment shown, the bottom 1 is designed as a disc and has a hole 3 with internal threads on the outer side for fixing vertical connecting plates (not shown) that form a grinding cup receiving portion, as shown and described in DE 20 2008 008 473 U1.

[0042] according to Figure 3 and Figure 5The bottom 1 has a flat, recessed planar region 5 on its surface 4 facing the bottom of the grinding cup 2 in grinding mode, which is recessed from the adjacent surface 4. This planar region forms a surface undulation of the bottom 1. The surface undulation is defined radially inward by an outer edge with a wavy profile 6. The axial surface 7 of the outer edge forms an anti-rotation surface. The recessed, flat planar region 5 is designed to be uninterruptedly surrounding and self-closing.

[0043] In the illustrated embodiment, the contour line 6 extends in a wavy manner with radial recesses 8 and radial protrusions 9 or contour bumps.

[0044] according to Figure 2 and Figure 4 The grinding cup 2 has a flat, planar region 11 on its bottom surface 10 facing the grinding cup holder in grinding mode, which protrudes from the adjacent surface 10. This planar region forms a surface undulation of the grinding cup bottom. The surface undulation is defined radially outward by an outer edge with a wavy profile 12 and radially inward by an outer edge with a circular profile 13. The axial surface 14 of the outer edge forms an anti-rotation surface. The protruding, flat planar region 11 is designed to be uninterruptedly surrounding and self-closing.

[0045] In the illustrated embodiment, the contour line 12 extends in a wavy manner with radial recesses 15 and radial protrusions 16 or contour bumps.

[0046] When the grinding cup is placed on the bottom 1 of the grinding cup holder, the protruding planar region 11 on the bottom of the grinding cup engages with the recessed planar region 5 of the bottom 1 in a form-fit manner, thereby achieving a form-fit connection between the grinding cup 2 and the bottom 1 in the circumferential direction or along the outer surface of the grinding cup 2. This connection prevents the grinding cup 2 from rotating about its central axis Z. Here, the axial surfaces 7 and 14 on the bottom 1 or the bottom of the grinding cup that abut each other, based on the selected complementary contour geometry of the outer edges of the surface undulations, prevent the grinding cup 2 from rotating about its central axis Z while connected to the grinding cup holder. Here, the radially outwardly extending protrusion 16 on the bottom of the grinding cup abuts with the radially inwardly extending protrusion 9 on the bottom 1 of the grinding cup holder in a form-fit manner in the circumferential direction.

[0047] As from Figure 5 As derived therefrom, the bottom 1 of the grinding cup holder may have a centrally located, recessed planar region 15 with a circular base surface. This recessed planar region is recessed relative to the adjacent planar region 16 of the bottom 1 and may have a depth of, for example, 1 to 5 mm. The adjacent planar region itself is defined by the outline 6 of the surface undulation on the bottom 1.

[0048] As from Figure 7As can be seen from this, the bottom of the grinding cup can have a centrally located, protruding planar region 17 with a circular base surface. This protruding planar region is raised relative to the adjacent planar region 11 of the bottom of the grinding cup and can have a height of, for example, 1 to 2 mm. This adjacent planar region forms the undulating surface of the surface undulation on the bottom of the grinding cup.

[0049] When the grinding cup 2 is placed on the bottom 1, the protruding flat area 17 on the bottom of the grinding cup engages with the recessed flat area 15 on the bottom 1, thereby centering the grinding cup 2. Therefore, complementary centering undulations are formed on the bottom of the grinding cup and on the bottom 1 of the grinding cup holder, which work together and can be connected to each other in a form-fit manner to achieve centering of the grinding cup.

[0050] As from Figure 2 , Figure 6 and Figure 7 Furthermore, it is found that a hole 18 can be provided in the planar region 11 of the surface undulation formed on the bottom of the grinding cup for receiving at least one anti-rotation pin, which is fixed to the bottom 1 and is not shown, as another anti-rotation device.

[0051] The surface undulations on the bottom of the grinding cup and the bottom 1 of the grinding cup holder have rounded edges and smoothed surfaces in the areas of the recesses 8 and 16 and the convexities 9 and 15, respectively. This results in high wear resistance of the surface. In addition, it makes it easy for the undulations to join together.

[0052] The surface undulations on the bottom 1 of the grinding cup holder can be formed on a undulation molded part, particularly a disc or annular shape, detachably connected to the bottom 1. In particular, a replaceable annular part can be provided, on which the surface undulations are formed, and this replaceable annular part can be screwed to the base 19 of the bottom 1 by screws 20. This allows for easy replacement of the annular part in the event of further wear of the surface undulations. It should be understood that, in principle, for the bottom of the grinding cup, it can also be specified that the surface undulations are formed on a undulation molded part, particularly a disc or annular shape, detachably connected to the grinding cup 2.

[0053] List of reference numerals in the attached diagram:

[0054] .

Claims

1. Laboratory mill having at least one mill cup holder for at least one mill cup (2) and having at least one anti-rotation means for holding the mill cup (2) in a defined and pre-set position relative to the mill cup holder and / or as a positioning aid, characterized in that, The grinding cup holder has at least one surface relief as an anti-rotation device on an axial surface (4) which faces the grinding cup bottom in the grinding mode, which surface relief can be connected in form-fitting manner with a mating relief on the axial surface (10) of the grinding cup bottom which is complementary to the surface relief, in order to form an anti-rotation mechanism.

2. Laboratory mill according to claim 1, characterized in that The laboratory grinding mill is a centrifugal ball mill and / or a planetary ball mill.

3. Laboratory mill according to claim 1 or 2, characterized in that The surface relief consists of at least one planar region (5) which is recessed or protruding in axial direction from the adjoining surface region of the axial surface (4) of the grinding cup holder, wherein, when the grinding cup (2) is arranged on or in the bottom (1) of the grinding cup holder, the recessed or protruding at least one planar region (11) on the axial surface (10) of the grinding cup bottom engages into the protruding or recessed at least one planar region (5) on the axial surface (4) of the grinding cup holder.

4. Laboratory mill according to claim 1 or 2, characterized in that The relief surface transitions in one piece into the adjoining surface region of the axial surface (4) of the grinding cup holder; and / or the surface relief has a flat relief surface.

5. Laboratory mill according to claim 1 or 2, characterized in that The surface relief is formed by a recess or a protrusion which is uninterrupted around the entire circumference of the grinding cup (2) or which is closed in itself.

6. Laboratory mill according to claim 1 or 2, characterized in that In a plan view of the relief surface, the contour course of at least one outer edge of the surface relief has a deviation from a strict circular shape and / or a strict annular shape.

7. Laboratory mill according to claim 6, characterized in that The outer edge has at least one local change in curvature characteristic in the circumferential direction.

8. The lab mill of claim 6, wherein, The outer edge forms a recessed cutout to form a form-fitting connection in the circumferential direction with the mating relief.

9. Laboratory mill according to claim 1 or 2, characterized in that In a plan view of the relief surface, the contour course of at least one outer edge of the surface relief is wavelike in the circumferential direction and / or the surface relief forms an inner or outer multi-tooth profile.

10. Laboratory mill according to claim 1 or 2, characterized in that In a plan view of the relief surface, the contour course of at least one outer edge of the surface relief is wavelike at least in sections in the circumferential direction and / or the surface relief forms an inner or outer multi-tooth profile.

11. Laboratory mill according to claim 1 or 2, characterized in that At least one centering relief is formed in the bottom (1) of the grinding cup holder, which centering relief can be connected in form-fitting manner with a complementary centering relief on the grinding cup bottom in the case of a form-fitting connection between the surface relief and the mating relief, in order to center the grinding cup (2) relative to the holding device.

12. Laboratory mill according to claim 1 or 2, characterized in that At least one bore (18) which extends in axial direction is provided in and / or on the axial surface (4) of the grinding cup holder, which bore serves as a further anti-rotation device for an anti-rotation pin.

13. Laboratory mill according to claim 12, characterized in that The bore (18) is arranged in a planar region of the relief surface.

14. Laboratory mill according to claim 1 or 2, characterized in that The surface relief is formed on a replaceable component which is detachably connected with the holding device.

15. Laboratory mill according to claim 14, characterized in that The replaceable component is disc-shaped or ring-shaped.

16. A grinding cup for a laboratory mill according to claim 1 or 2, having a surface relief as an anti-rotation means on an axial surface (10) of a grinding cup bottom, which axial surface (10) faces a grinding cup holder of the laboratory mill in the grinding mode, which surface relief can be connected in a form-fit manner with a mating relief on an axial surface (4) of the grinding cup holder, which is complementary to the surface relief, to form an anti-rotation mechanism.

17. The mill cup of claim 16, wherein, The surface relief consists of at least one planar region (11) which is recessed or protruding in the axial direction from an adjoining surface region of the axial surface (10) of the grinding cup bottom, wherein the recessed or protruding at least one planar region (11) on the axial surface (10) of the grinding cup bottom engages into the protruding or recessed at least one planar region (5) on the axial surface (4) of the grinding cup holder when the grinding cup (2) is arranged on or in the bottom (1) of the grinding cup holder.

18. The mill cup of claim 16 or 17, wherein, The relief surface transitions in one piece into an adjoining surface region of the axial surface (10) of the grinding cup bottom; and / or the surface relief has a flat relief surface.

19. The mill cup of claim 16 or 17, wherein, The surface relief is formed by a recess or a protrusion which is uninterrupted around the entire circumferential portion of the grinding cup (2) or is self-closing.

20. The mill cup of claim 16 or 17, wherein, In a top view of the relief surface, the contour course of at least one outer edge of the surface relief has a deviation from a strict circular shape and / or a strict annular shape.

21. The mill cup of claim 20, wherein, The outer edge has at least one local change in curvature characteristic in the circumferential direction.

22. The mill cup of claim 20, wherein, The outer edge forms a recessed cutout to form a form-fit connection in the circumferential direction with the mating relief.

23. The mill cup of claim 16 or 17, wherein, In a top view of the relief surface, the contour course of at least one outer edge of the surface relief is wavelike in the circumferential direction, and / or the surface relief forms an inner or outer multi-tooth profile.

24. The mill cup of any of the preceding claims 16 or 17, wherein, In a top view of the relief surface, the contour course of at least one outer edge of the surface relief is wavelike at least in sections in the circumferential direction, and / or the surface relief forms an inner or outer multi-tooth profile.

25. The mill cup of claim 16 or 17, wherein, At least one centering relief is formed in the grinding cup bottom, which centering relief can be connected in a form-fit manner with a complementary centering relief on the grinding cup holder to center the grinding cup (2) relative to the holding device in the case of a form-fit connection between the surface relief and the mating relief.

26. The mill cup of claim 16 or 17, wherein, At least one hole (18) extending in the axial direction is provided on the axial surface (10) of the grinding cup bottom, which hole serves to receive an anti-rotation pin as a further anti-rotation means.

27. The mill cup of claim 26, wherein, The hole (18) is arranged in a planar region of the relief surface.

28. The mill cup of claim 16 or 17, wherein, The surface relief is formed on a replaceable part which is detachably connected to the grinding cup (2).

29. The mill cup of claim 28, wherein, The replaceable part is disc-shaped or ring-shaped.

30. An assembly having a laboratory grinder according to any one of claims 1 to 15 and a grinding cup according to any one of claims 16 to 29.

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