Agitator mill and method for mounting and dismounting the grinding vessel bottom of an agitator mill

Abstract

The present invention provides a stirred mill having a grinding container and a stirring shaft rotatably supported in the grinding container and extending axially within the grinding container. The stirred mill has an additional bearing disposed outside the grinding container and tensioned to the axial end of the stirring shaft, and a connecting flange disposed at the bottom of the grinding container and extending in the direction of the additional bearing. A through-hole is provided in the bottom of the grinding container, and the through-hole and the connecting flange have an inner diameter larger than that of the additional bearing. An adapter ring is provided, which can be inserted into an annular gap formed between the connecting flange and the bearing, bridging the annular gap and connecting to the connecting flange. In the installed state, the additional bearing can be clamped to the bottom of the grinding container via the adapter ring. The invention also includes a method for installing and removing the bottom of the grinding container in such a stirred mill.

Description

Technical Field

[0001] The present invention relates to a stirred mill and a method for installing and removing a housing including an abrasive material inlet or an abrasive material outlet in the stirred mill. Background Technology

[0002] Stirred mills are used for fine and ultrafine grinding of solids in liquid or dry materials. A conventional stirred mill has a grinding container in which an agitator shaft carrying grinding elements is rotatably supported. These grinding elements can be designed as fixed discs or movable grinding media, and they pulverize the material by introducing impact, shear, and frictional forces into the material during the rotation of the agitator shaft. Stirred mills are used in various industries, such as for the fine grinding of cement components, the crushing of ores and minerals, the production of pigments, paints, and varnishes, the fine grinding of active ingredients in pharmaceutical production, and the processing of cocoa blocks, spices, or proteins, such as in food engineering. In a stirred mill, the grinding media (such as balls or cylinders) are filled with loose grinding media that move freely within the grinding container. In this case, the agitator shaft moves the grinding media, pulverizing the material through impact, friction, and shear forces.

[0003] In large stirred mills with long and heavy agitator shafts, additional bearing housings are often installed at the free shaft end outside the grinding vessel to prevent uncontrolled shaft bending. In conventional designs, another bearing is directly connected to the bottom of the grinding vessel, requiring complete bearing removal to access the interior space of the grinding vessel for purposes such as inspection or maintenance of the grinding elements. The disadvantages here are that bearing removal is time-consuming, leading to extended downtime, requiring additional lifting or special equipment for safe handling of the bearing, and posing a risk of damaging bearing components due to repeated disassembly. Summary of the Invention

[0004] Therefore, the object of the present invention is to provide a simplified possibility for accessing the internal space of a mill container.

[0005] According to the invention, this objective is achieved in each case through the subject matter of the independent claims.

[0006] According to a first aspect of the invention, a stirred mill is provided, comprising a grinding container and a stirring shaft rotatably supported within the grinding container and extending axially within the grinding container. The stirred mill includes an additional bearing disposed outside the grinding container and tensioned to the axial end of the stirring shaft, and a connecting flange disposed at the bottom of the grinding container and extending in the direction of the additional bearing. In this configuration, a through-hole is provided at the bottom of the grinding container, wherein the through-hole and the connecting flange have an inner diameter larger than that of the additional bearing, and an adapter ring is provided that can be inserted into an annular gap formed between the connecting flange and the bearing, bridging the annular gap and connecting to the connecting flange. In the installed state, the additional bearing is clamped to the bottom of the grinding container by the adapter ring.

[0007] According to a second aspect of the invention, a method is provided for disassembling the bottom of a grinding container in a stirred mill according to the invention. The method includes: loosening and removing a clamping ring; loosening and removing an adapter ring; and pulling the bottom of the grinding container past an additional bearing.

[0008] According to a third aspect of the invention, a method is provided for mounting the bottom of a grinding container in a stirred mill according to the invention. The method comprises: pushing the bottom of the grinding container past an additional bearing until a mounting position of the bottom of the grinding container on the grinding container is reached; aligning and connecting the bottom of the grinding container to the grinding container; inserting an adapter ring into an annular gap and centering the additional bearing and the stirring shaft by securing the adapter ring to a connecting flange; and placing and screwing a clamping ring onto the adapter ring and the additional bearing, particularly onto a bearing flange surrounding the additional bearing.

[0009] A fundamental idea of ​​this invention is to avoid disassembling the additional bearings arranged at the free shaft end, particularly in large stirred mills, because the bearings are no longer directly connected to the bottom of the grinding container, but are clamped to the bottom of the grinding container via an adapter ring and a clamping ring through a connecting flange arranged thereon. Since the inner diameter of the through-hole is larger than the outer diameter of the bearing, an annular gap is created, which is closed by the adapter ring in the installed state. During the installation or removal of the bottom of the grinding container, an opening is formed through the annular gap, which has a net width larger than the diameter of the bearing, allowing the bottom of the grinding container to be guided onto the bearing and thus into the grinding chamber. Here, the annular gap is sized such that even if the bearing, no longer supported in the connecting flange, bends, the bottom of the grinding container can still be pulled out. This simplifies access to the interior of the grinding container, for example for maintenance and inspection purposes, without having to remove the additional bearings of the mill. This is particularly advantageous in large grinding units, as there is no need to use lifting devices to remove heavy bearings. Installation and removal are further simplified if the bottom of the grinding container is combined with the platform as a single unit, which is designed to be movable relative to the grinding container during installation or removal. In addition to shortening the workflow, the bearing life is extended by fixing the bearing to the shaft and avoiding repeated installation and disassembly. Furthermore, the centering effect of the adapter ring prevents misalignment that may occur during repeated installation. Because the adapter ring has a tapered centering portion, precise alignment of the agitator shaft and the additional bearing is advantageously achieved during installation. Although the advantages of the agitator mill according to the invention are primarily associated with large agitator mills with long agitator shafts (e.g., in the cement or mining industries), the agitator mill designed according to the invention can also be scaled up for other mill sizes and applications, and can be implemented as smaller mills or laboratory mills (e.g., in the food and pharmaceutical industries). The method according to the invention advantageously enables orderly and rapid installation or disassembly in several steps, wherein the bottom of the grinding vessel is simply pushed over the additional bearing that maintains the connection to the shaft.

[0010] Advantageous implementations and improvements are derived from the dependent claims that reference the independent claim and the description with reference to the accompanying drawings.

[0011] According to one embodiment, a housing disposed between the bottom of the grinding container and an additional bearing is located at the bottom of the grinding container. In this case, a through-hole extends from the bottom of the grinding container through the housing, and a connecting flange is disposed on the outer side of the housing facing the bearing, wherein, in the installed state, the additional bearing is clamped to the housing by an adapter ring. Therefore, for installation or removal, the housing does not need to be disassembled separately, but can be pulled across the bearing along with the bottom of the grinding container.

[0012] According to one embodiment, a clamping ring is provided, wherein, in the installed state, the clamping ring is screwed onto an adapter ring and an additional bearing, particularly onto a flange surrounding the bearing. By screwing the clamping ring onto the adapter ring and the bearing flange, a stable and form-fit connection is provided, ensuring reliable force transmission between the components. Furthermore, the clamping ring allows for easy disengagement of the connection between the bearing and the adapter ring, such that the annular gap opened after removing the adapter ring allows the bottom of the grinding vessel, or the bottom of the grinding vessel and its housing, to be pulled out from the bearing or the agitator shaft.

[0013] According to an improved design, the clamping ring is formed by multiple independent clamping segments. In the installed state, the clamping segments are screwed onto the adapter ring and the additional bearing, specifically onto the bearing flange surrounding the additional bearing. Because the clamping segments can be installed and removed individually, it is not necessary to push the fully enclosed clamping ring over the shaft or bearing. This allows for gradual disassembly. The clamping segments can be installed and adjusted individually, thereby advantageously achieving uniform clamping with the adapter ring and the bearing flange.

[0014] According to one embodiment, the adapter ring has a tapered centering portion that can be inserted between an additional bearing and a connecting flange, and centers the additional bearing relative to the connecting flange. The tapered centering portion allows the additional bearing to be automatically, accurately, and reproducibly aligned with the connecting flange, preventing misalignment. Furthermore, the tapered cross-section of the adapter ring facilitates axial insertion of the bearing into the mounting position because the adapter ring automatically slides or is pulled into the correct position through the tapered effect.

[0015] According to an improved embodiment, at least one load-bearing support device is provided, which can engage with an additional bearing. The support device can be designed as a hydraulically or pneumatically operated lifting cylinder, a support column, or a punch movable in the bearing direction and connected to or potentially connected to the bottom of the grinding vessel, the housing, or the housing base. The support device can also be integrated into the platform of the stirred mill, or, if desired, arranged below the bearing or support point. During disassembly, the support device advantageously absorbs a portion of the bending force acting on the stirring shaft, thereby reducing the mechanical load on the stirring shaft. Instead of the support device described above, suspension points, such as eyelets or hooks, can be provided on the bearing for connection to a lifting device arranged above the bearing.

[0016] According to an improved method for disassembly, a housing is provided, which can be arranged between the bottom of the grinding container and the additional bearing, and has an inlet or outlet for the grinding material. Therefore, when the bottom of the grinding container is pulled out, the bottom of the grinding container and the housing, which can be arranged thereon, can be pulled past the additional bearing. This advantageously speeds up disassembly because the housing can also be guided on the bearing. Of course, the bottom of the grinding container and the housing can also be separated from each other and guided sequentially on the bearing.

[0017] According to an improved method for disassembly, the clamping ring is formed by multiple independent clamping segments, and these segments are sequentially released and removed during the loosening and removal of the clamping ring. This segmented construction allows the clamping ring to be removed piecemeal. Because individual clamping segments are released sequentially, it is not necessary to laboriously or simultaneously lift the entire clamping ring. As a result, especially in large factories, no additional lifting devices or special tools are required. When a conventional one-piece clamping ring is released simultaneously, uneven stress is applied to the bearing and adapter ring; the risk of stress is advantageously reduced by sequential disassembly in segments.

[0018] According to an improved method for disassembly, before or after releasing and removing the clamping ring or clamping segment and adapter ring, a load-bearing support is engaged with the additional bearing. In this case, the support advantageously bears a portion of the load of the additional bearing and prevents the bearing or shaft from jamming during disassembly. Furthermore, the bending force acting on the shaft is reduced. Particularly in the case of large stirred mills with heavy-duty bearings, the support enables controlled disassembly because the bearing support prevents or reduces free extension, thereby preventing or reducing the transmission of corresponding bending forces to the shaft. Alternatively, the bearing can also be suspended from a lifting device.

[0019] According to an improved method for installation, a housing is provided, which can be arranged between the bottom of the grinding container and an additional bearing, and has an inlet or outlet for the abrasive material. Here, during the pushing process of the bottom of the grinding container, the bottom of the grinding container and the housing, on which it may be arranged, are pushed past the additional bearing until the bottom of the grinding container reaches its installation position on the grinding container. This speeds up the installation because the bottom of the grinding container and the housing, on which it may be arranged, can be guided as a single unit on the bearing. Alternatively, the bottom of the grinding container and the housing can be guided sequentially on the bearing, wherein the bearing can then clamp onto the housing.

[0020] According to an improved method for installation, the clamping ring is formed by multiple independent clamping segments. The individual clamping segments are positioned and tightened sequentially when the clamping ring is placed and screwed onto the adapter ring and additional bearing. This provides the same advantages associated with disassembly during installation.

[0021] According to an improved method for installation, the additional bearing and agitator shaft are centered relative to the grinding vessel flange via a tapered centering portion of the adapter ring. This tapered centering portion ensures that the additional bearing and agitator shaft automatically move into or are introduced into the installation position. This advantageously eliminates the need for manual adjustment. Precise centering also ensures a uniform force distribution, thereby minimizing the load on the bearing, adapter ring, and grinding vessel flange.

[0022] According to an improved method for installation, a load-bearing support is engaged with the additional bearing before the adapter ring is inserted. In this case, the support advantageously bears a portion of the load of the additional bearing, preventing the bearing or shaft from jamming during installation and providing centering. Particularly in the case of large stirred mills with heavy-duty bearings, the support enables controlled installation because the bearing support prevents or reduces free extension, thereby preventing or reducing the transmission of corresponding bending forces to the shaft. Alternatively, the bearing can also be suspended from a lifting device.

[0023] The above-described embodiments and improvements can be freely combined with each other, as long as they are meaningful. Other possible embodiments, improvements, and implementations of the invention include combinations of features of the invention not explicitly mentioned in the preceding or hereinafter described with reference to the embodiments. In particular, those skilled in the art will also add individual aspects as improvements or supplements to the corresponding basic forms of the invention. Attached Figure Description

[0024] The present invention will now be explained in more detail with reference to the accompanying drawings and embodiments. As can be seen from the drawings: Figure 1 This is a schematic diagram of a portion of a stirred mill according to an embodiment of the present invention; Figure 2 This is a cross-sectional view of a stirred mill according to an embodiment of the present invention; Figure 3 This is a cross-sectional view of a stirred mill according to an embodiment of the present invention.

[0025] In the accompanying drawings, unless otherwise specified, the same, functional, and operational elements, features, and parts have the same reference numerals in every case. Detailed Implementation

[0026] Although specific embodiments and improvements have been shown and described herein, those skilled in the art will appreciate that numerous alternative and / or similar embodiments may be substituted for the specific embodiments shown and described without departing from the scope of the invention. This application is generally intended to cover all modifications or variations of the particular embodiments described herein.

[0027] The accompanying drawings are intended to provide a further understanding of embodiments of the invention and, in conjunction with the description, to explain the principles and concepts of the invention. Other embodiments and many of the advantages mentioned will become apparent from the drawings. The drawings are to be understood as schematic only, and the elements in the drawings are not necessarily shown to scale relative to each other. Terms indicating direction, such as “up,” “down,” “left,” “right,” “above,” “below,” “horizontal,” “vertical,” “front,” “back,” etc., are for illustrative purposes only and are not intended to limit the generality to the specific design shown in the figures.

[0028] The dashed lines in the attached diagram indicate that the connections between components do not necessarily require physical contact; they can also be wirelessly coupled to each other.

[0029] Figure 1 A schematic diagram of a portion of a stirred mill 10 according to an embodiment of the present invention is shown. The stirred mill 10 includes... Figure 1 The grinding container 11 (not shown) includes a stirring shaft 12 that extends along the longitudinal axis L of the grinding container 11 and is rotatably mounted. This stirring shaft 12 protrudes longitudinally from... Figure 1 The grinding chamber 30 is not shown. The axial end 13 of the stirring shaft 12 is tensioned by an additional bearing 14 disposed outside the grinding container 11. In an embodiment, the grinding container bottom 15 (not shown) is connected to a housing 19, which surrounds the inlet or outlet of the grinding material and is axially adjacent to and connected to the grinding container bottom 15. Here, the housing 19 has a connecting flange 21 extending in the direction of the additional bearing 14. A through-hole 16 leading to the grinding chamber 30 extends between the grinding container bottom 15 and the housing 19, through which the stirring shaft is guided into the grinding chamber 30. Like the connecting flange 21, the through-hole 16 has an inner diameter 17 larger than the outer diameter 18 of the additional bearing 14. The connecting flange 21 is mounted on the outer side 20 of the housing 19 and surrounds the through-hole 16. An adapter ring 22 is inserted between the connecting flange 21 and the additional bearing 14. The adapter ring 22 is screwed onto the connecting flange 21. The adapter ring 22 is provided with a tapered centering portion 23, which rests against the inclined surface 24 of the connecting flange 21 facing the adapter ring 22. In the installed state, the in-plane circumferential surface 25 of the adapter ring 22 lies on the outer circumferential surface 26 of the bearing 14. The tapered centering portion 23 is configured to produce a self-centering effect during installation, guiding the additional bearing 14 to a precise position relative to the connecting flange 21. The tapered shape allows the bearing 14 to be automatically pulled into the correct position by the adapter ring 22 during installation, thereby avoiding misalignment. Furthermore, the tapered design facilitates the insertion of the adapter ring 22, as it is axially positioned on the bearing 14 when the screw connection is tightened, forming a uniform contact surface, and is simultaneously pulled into the connecting flange 21.

[0030] The adapter ring 22 is screwed onto the bearing flange 28 surrounding the bearing 14 via a clamping ring 27 formed by multiple independent clamping segments 27a, and onto the adapter ring 22 itself. The split clamping ring 27 secures the connection between the adapter ring 22 and the bearing flange 28, thus stably fixing the additional bearing 14 axially. An annular gap 29 is provided between the connecting flange 21 and the additional bearing 14, which is bridged by the adapter ring 22 in the installed state. The annular gap 29 is sized such that (when the adapter ring 22 is removed) its width is greater than the reduction in bearing 14 size caused by the bending of the stirring shaft 12. Therefore, even if the adapter ring 22 is removed, the bearing cannot be placed on the through hole 16. Thus, the net width of the annular gap 29 allows the housing 19 and the bottom of the grinding container 15 connected thereto to be moved axially off the bearing 14 after the adapter ring 22 is removed, i.e., moved axially, without having to remove the bearing 14 from the stirring shaft 12. When disassembling housing 19, the split clamping ring 27 is first released and removed. Then the adapter ring is removed, thereby exposing the annular gap. This allows access to the interior of the grinding container 11 without the need for laborious removal of the additional bearing 14.

[0031] Figure 2 A cross-sectional view of a stirred mill 10 according to an embodiment of the present invention is shown. The stirred mill 10 includes a stirring shaft 12 extending along a longitudinal axis L, which is rotatably supported within a grinding container 11. The stirring shaft 12 is supported in at least one additional bearing 31. Figure 2 (Not shown in the diagram). At the free axial end 13 of the stirring shaft 12 protruding from the grinding container 11, an additional bearing 14 is arranged outside the grinding container 11 to stabilize the stirring shaft 12 and prevent uncontrolled bending. The additional bearing 14 is tensioned to the stirring shaft 12 and clamped to the connecting flange 21 of the housing 19 by an adapter ring 22 and a split clamping ring 27. In this embodiment, the housing 19 is arranged on the bottom 15 of the grinding container and serves as the inlet housing for the grinding material. The housing 19 enables the controlled supply of grinding material into the grinding container 11, where the grinding material is pulverized by grinding media located in the grinding chamber 30 as the stirring shaft 12 rotates.

[0032] Such as combination Figure 1The adapter ring 22 has a tapered centering portion 23 located between the auxiliary bearing 14 and the connecting flange 21 arranged on the outer side 40 of the housing 19, with the bearing 14 centered relative to the connecting flange 21. An annular gap 29 is provided between the auxiliary bearing 14 and the connecting flange 21, the net width of which is designed to allow the housing 19 and the bottom of the grinding container 15 connected thereto to move along the longitudinal axis L on the auxiliary bearing 14 without impact. This allows the housing 19 and the bottom of the grinding container 15 to be disassembled without removing the auxiliary bearing 14, thereby enabling, for example, maintenance or inspection of the stirring element 32 inside the grinding container 11.

[0033] The stirring shaft 12 extends through the entire grinding container 11 and has an outlet housing 34 and a separation device 35 disposed within the grinding container 11 at a second end 33 opposite to the additional bearing 14. This separation device 35 is used to separate the grinding media (not shown) from the grinding material flow before the grinding material flow leaves the grinding container 11 through the outlet housing 34. The stirring shaft 12 is connected to a drive unit (…). Figure 2 (Not shown in the image), this drive unit generates the rotary motion required for the grinding process. The drive unit can be, for example, an electric motor connected to the stirring shaft 12 via a clutch or gearbox. Figure 2 In this embodiment, the unit 39 formed by the housing 19 and the bottom 15 of the grinding container is fixed on a platform 38, which is movable relative to the grinding container 11 in the longitudinal direction L. A support element 40 is also provided in the platform 38, which is designed as a punch to support the bearing 14 during installation or removal, and can be applied to or lowered from the bearing 14 in a height-adjustable manner via a crank drive 37.

[0034] Figure 3 A cross-sectional view of a stirred mill 10 according to an embodiment of the present invention is shown.

[0035] In this figure, the bottom of the grinding container 15 can be seen. The bottom of the grinding container 15 is screwed onto the grinding container 11 and seals the grinding container 11 when the stirred mill 10 is installed. The bottom of the grinding container 15 can be removed together with the housing 19 disposed thereon to allow access to the interior of the grinding container, for example, to perform maintenance or inspection work on the stirring element 32.

[0036] In the illustrated embodiment, the housing 19 serves as an inlet housing for the abrasive material. The housing 19 extends axially beyond the free axial end 13 of the stirring shaft 12 and is capable of supplying the abrasive material to the grinding container 11 in a controlled manner. The housing 19 is provided with a rectangular opening 36 for receiving the abrasive material, and through… Figure 3 The connecting flange (not shown) is connected to the bottom 15 of the grinding container.

[0037] An additional bearing 14 is also shown, which is tensioned to the stirring shaft 12 and is axially positioned downstream of the housing 19. The stirring shaft 12 is supported in at least one additional bearing 31 associated with the grinding vessel 11. To secure the additional bearing 14, an adapter ring 22 is provided, which is screwed onto a connecting flange 21 located on the outer side 20 of the housing 19. For additional securing, a split clamping ring 27 is provided, which connects the bearing 14 to the adapter ring 22. To allow the housing 19 and the bottom 15 of the grinding vessel to be guided on the bearing 14 for disassembly, first loosen the screw connection of the clamping segment 27a of the clamping ring 27, and then remove the clamping segment 27a from the adapter ring 22 and the bearing flange 28 (see [link]). Figure 1 This allows the connection between the adapter ring 22 and the additional bearing 14 to be released. The adapter ring 22 is then removed from its clamped position on the connecting flange 21, thereby releasing the annular gap 29 between the additional bearing 14 and the connecting flange 21. After releasing the connection between the grinding container bottom 15 and the grinding container 11, the housing 19 can be pulled over the additional bearing 14 together with the grinding container bottom 15. Before removing the adapter ring 22, the support device 40, located in the platform 38 at the center below the bearing 14, can move in the direction of the bearing 14 and engage with the bearing 14 to withstand any bending loads and hold the bearing 14 in a horizontal position. In this embodiment, the support device 40 is designed as a punch that can be driven by a manual crank drive device 37 (see...). Figure 2 The grinding chamber 11 is height-adjustable and rests against bearing 14, and a manual crank drive 37 is also mounted in platform 38. The grinding chamber bottom 15 and housing 19 can also be securely connected to the platform and combined in a unit 39 movable relative to the grinding chamber 11. For removal, the unit moves on bearing 14 and makes the grinding chamber 11 accessible without having to remove bearing 14 from the stirring shaft 12.

[0038] In the foregoing detailed description, various features have been summarized in one or more examples to enhance the rigor of the representation. However, it should be clear that the above description is merely illustrative and not restrictive. It is intended to cover all alternatives, modifications, and equivalents of the various features and embodiments. Given the foregoing description, many other examples will be readily and directly understood by those skilled in the art based on their expertise.

[0039] The embodiments were chosen and described in order to best represent the principles upon which the invention is based and its potential applications in practice. Therefore, those skilled in the art can best modify and use the invention and its various embodiments with respect to their intended use. In the claims and description, the terms “comprising” and “having” are used as neutral linguistic terms corresponding to the term “including”. Furthermore, the use of the term “a” is not intended to fundamentally exclude the plurality of features and components described in this manner.

[0040] List of reference numerals

[0041] 10. Stirred Mill

[0042] 11 Grinding container

[0043] 12 stirring shafts

[0044] 13 Axial end

[0045] 14 bearings

[0046] 15. Bottom of the grinding container

[0047] 16 through holes

[0048] 17 inner diameter

[0049] 18 outer diameter

[0050] 19. Shell

[0051] 20 Outer side

[0052] 21 Connecting flange

[0053] 22 adapter rings

[0054] 23. Focusing on the Mind

[0055] 24 Area

[0056] 25 Inner circumferential surface

[0057] 26 Outer Peripheral Surface

[0058] 27 Clamping ring

[0059] 27a Clamping section

[0060] 28 Bearing Flange

[0061] 29. Annular gap

[0062] 30 Grinding Chamber

[0063] 31 Other bearings

[0064] 32 Stirring element

[0065] 33 Second End

[0066] 34. Outlet shell

[0067] 35 Separation device

[0068] 36 Opening

[0069] 37 Crank drive mechanism

[0070] 38 Platform

[0071] Unit 39

[0072] 40 Support device

[0073] L longitudinal axis

Claims

1. A stirred mill (10) having a grinding container (11) and a stirring shaft (12), the stirring shaft (12) being rotatably supported in the grinding container (11) and extending axially within the grinding container (11), the stirred mill (10) having an additional bearing (14) disposed outside the grinding container (11) and tensioned to an axial end (13) of the stirring shaft (12), the connecting flange (21) being disposed at the bottom (15) of the grinding container and extending in the direction of the additional bearing (14), wherein, A through hole (16) is provided at the bottom of the grinding container. The through hole (16) and the connecting flange (21) have an inner diameter (17) larger than that of the additional bearing (14). An adapter ring (22) is provided therein. The adapter ring (22) can be inserted into the annular gap (29) formed between the connecting flange (21) and the bearing (14), can bridge the annular gap (29) and can be connected to the connecting flange (21). In the installed state, the additional bearing (14) can be clamped to the bottom (15) of the grinding container by the adapter ring (22).

2. The stirred mill (10) according to claim 1, wherein, A housing (19) is provided at the bottom (15) of the grinding container, the housing (19) being disposed between the bottom (15) of the grinding container and the additional bearing (14), and the through hole (16) extending from the bottom (15) of the grinding container through the housing (19), and the connecting flange (21) being disposed on the outer side (20) of the housing (19) facing the bearing (14), and wherein, in the installed state, the additional bearing (14) can be clamped to the housing (19) by the adapter ring (22).

3. The stirred mill (10) according to claim 1 or 2, characterized in that, A clamping ring (27) is provided, wherein, in the installed state, the clamping ring (27) can be screwed onto the adapter ring (22) and the additional bearing (14), particularly onto the bearing flange (28) surrounding the additional bearing (14).

4. The stirred mill (10) according to claim 3, wherein, The clamping ring (27) is formed by a plurality of independent clamping segments (27a), and in the installed state, the clamping segments (27a) can be screwed onto the adapter ring (22) and the additional bearing (14), particularly onto the bearing flange (28) surrounding the additional bearing (14).

5. The stirred mill (10) according to any one of the preceding claims, characterized in that, The adapter ring (22) has a tapered centering portion (23) that can be inserted between the additional bearing (14) and the connecting flange (21) and center the additional bearing (14) relative to the connecting flange (21).

6. The stirred mill (10) according to any one of the preceding claims, characterized in that, At least one load-bearing support device (40) is provided, which can engage with the additional bearing (14).

7. A method for disassembling the bottom (15) of the grinding vessel of a stirred mill (10) according to any one of claims 1 to 6, comprising: - Loosen and remove the clamping ring (27); - Loosen and remove the adapter ring (22); and - Pull the bottom (15) of the grinding container over the additional bearing (14).

8. The method according to claim 7, wherein, A housing (19) is provided, which is disposed between the bottom of the grinding container (15) and the additional bearing (14) and has an abrasive material inlet or abrasive material outlet, and when the bottom of the grinding container (15) is pulled out, the bottom of the grinding container (15) and the housing (19) which can be disposed on the bottom of the grinding container (15) are pulled past the additional bearing (14).

9. The method according to claim 7 or 8, wherein, The clamping ring (27) is formed by multiple independent clamping segments (27a), and the clamping segments (27a) are sequentially released and removed when the clamping ring (27) is released and removed.

10. The method according to any one of claims 7 to 9, wherein, Before releasing the adapter ring (22), the load-bearing support device (40) is engaged with the additional bearing (14).

11. A method for installing the bottom (15) of the grinding container in a stirred mill (10) according to any one of claims 1 to 6, comprising: - Push the bottom (15) of the grinding container past the additional bearing (14) until the bottom (15) of the grinding container is in its mounting position on the grinding container (11). - Align and connect the bottom (15) of the grinding container with the grinding container (11). - Insert the adapter ring (22) into the annular gap (29) and center the additional bearing (14) and the stirring shaft (12) by fixing the adapter ring (22) to the connecting flange (21); and - Place the clamping ring (27) and screw the clamping ring (27) onto the adapter ring (22) and the additional bearing (14), particularly onto the bearing flange (28) surrounding the additional bearing (14).

12. The method according to claim 11, wherein, A housing (19) is provided, which is arranged between the bottom of the grinding container (15) and the additional bearing (14) and has an abrasive material inlet or abrasive material outlet. When the bottom of the grinding container (15) is pushed in, the bottom of the grinding container (15) and the housing (19) that can be arranged on the bottom of the grinding container (15) are pushed past the additional bearing (14) until the bottom of the grinding container (15) reaches the mounting position on the grinding container (11).

13. The method according to claim 11 or 12, wherein, The clamping ring (27) is formed by multiple independent clamping segments (27a), and the clamping ring (27) is placed and screwed onto the adapter ring (22) and the additional bearing (14) in sequence, and the clamping segments (27a) are placed and screwed onto the adapter ring (22) and the additional bearing (14).

14. The method according to any one of claims 11 to 13, wherein, The centering of the additional bearing (14) and the stirring shaft (12) relative to the connecting flange (21) is achieved by the tapered centering portion (23) of the adapter ring (22).

15. The method according to any one of claims 11 to 14, wherein, Before inserting the adapter ring (22), the load-bearing support device (40) is engaged with the additional bearing (14).

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