rotor

Abstract

This invention provides a rotor for a stirred ball mill. The rotor has a multi-piece metal base frame, several grinding tools arranged on the base frame, and at least one, preferably several, non-metallic outer casing elements. The at least one outer casing element is preferably releasably mounted on the base frame and designed such that the surface of the base frame is substantially covered or protected by the outer casing element. Additionally, a grinding disc assembly for a rotor, an outer casing element, and a metal base frame for a rotor are also provided.

Description

Technical Field

[0001] The present invention relates to a rotor, and more particularly to a rotor for the metal-free process zone of a stirred ball mill. Background Technology

[0002] Due to the increasing demand for batteries, the production of cathode or anode active materials is becoming increasingly important. For grinding active materials such as lithium iron phosphate (LFP), nickel manganese cobalt lithium oxide (NCM), silicon (Si), or similar materials, a stirred ball mill (RWKM) with a metal-free process zone is necessary. This process zone can contain a volume exceeding 60 liters. The process zone includes a rotor and a cooled stator. The stator is mostly made of silicon carbide (SiC) due to water cooling, while the rotor, which does not require separate cooling, is more flexible in terms of material selection. If the product to be ground is water-based, a rotor made of low-cost plastic (e.g., polyurethane (PU)) is typically used. If the product is a solvent-based formulation, a rotor made of ceramic (e.g., zirconium oxide (ZrO)) is used.

[0003] However, ceramic rotors, in particular, are expensive to produce, heavy, and prone to impact during installation in stirred ball mills. Furthermore, some ceramics have different coefficients of thermal expansion than steel, making rotor design and manufacturing complex and expensive. On the other hand, rotors made entirely of plastic or metal rotors encased in plastic are not solvent-resistant and are therefore unsuitable for many products. Additionally, rotor rigidity is important to prevent component deformation during operation.

[0004] Patent documents CN205304429U, DE10064828B4, CN210279354U, CN204134699U, CN210357393U and CN204724256U relate to the prior art of this invention. Summary of the Invention

[0005] Therefore, the objective of this invention is to overcome the shortcomings of previous rotors. This objective is achieved through the following features. The invention is defined in the independent claims. The dependent claims describe preferred embodiments.

[0006] The present invention provides a rotor for a stirred ball mill. The rotor has a multi-piece metal base frame, several grinding tools arranged on the base frame, and at least one, preferably several, non-metallic outer casing elements. The at least one outer casing element is preferably releasably mounted on the base frame and is designed such that the surface of the base frame is substantially covered or protected by the outer casing element.

[0007] At least a portion of the basic framework may be formed by one or more grinding discs arranged side by side and / or spacer bushings and / or flow guide cages each arranged between two adjacent grinding discs.

[0008] During operation, the rotor should be arranged in the grinding chamber of the stirred ball mill, which is filled with the grinding objects and grinding aids, wherein the surfaces of the basic frame covered by the outer cover element are those surfaces that may come into contact with the grinding objects and grinding aids when the rotor is in use without the cover.

[0009] Preferably, the at least one outer cover element is provided with an opening for the grinding tool to pass through.

[0010] One section of the rotor is specifically formed as a cylindrical drive section, wherein a metal basic frame forms a grinding disc frame section within the drive section. The grinding disc frame section is formed by one or more spaced metal grinding discs, each of which has two side surfaces, a through hole formed in the center of the grinding disc for receiving the stirring shaft of the drive rotor, and an outer peripheral surface, wherein several grinding tools are arranged on the outer peripheral surface. The portion for covering the grinding disc is formed by two plastic half-shells, which at least surround the side surfaces and the outer peripheral surface of the grinding disc.

[0011] Additionally, another section of the rotor may form a cylindrical cage section, within which a basic metal frame forms a flow guide cage. This flow guide cage is formed by longitudinal metal supports spaced apart from each other in a circumferential direction, extending along the rotor's rotation axis, with longitudinal grooves designed between the supports. Several grinding tools may be arranged at the longitudinal supports, with portions of the outer cover elements covering the sections of the longitudinal supports between the grinding tools formed by the outer cover elements.

[0012] The longitudinal supports of the cage section can each be connected to the grinding disc of the drive section adjacent to the cage section by means of tie rods / push rods.

[0013] The ends of the basic frame may be formed by annular metal end elements within the cage section, which are connected to longitudinal supports. Outer cover elements for covering the end elements may be formed by bow-shaped elements fixed to the end elements on both sides.

[0014] The outer casing element can be connected to the basic frame shape by means of a press connection, or preferably bolted to the basic frame.

[0015] The outer casing element is specifically made of thermoplastic, thermosetting, or elastomer, such as PA, PE, PU, ​​NBR, or fiber-reinforced plastic. The metal base frame may be made of stainless steel, while the grinding tools may be made of ceramic, preferably zirconium oxide or silicon carbide, or plastic.

[0016] To produce the outer casing components, cutting processes such as milling, turning, or drilling can be used, along with 3D printing or injection molding processes.

[0017] Furthermore, the present invention provides a grinding disc assembly for a rotor, particularly for the rotor described above according to the present invention. The assembly comprises a metal grinding disc having two side surfaces, a through hole formed in the center of the grinding disc for receiving a stirring shaft, and an outer peripheral surface. Additionally, several grinding tools are arranged on the outer peripheral surface, protruding radially outward from the outer peripheral surface, and two plastic half-shells for covering the grinding disc, these two plastic half-shells being fixed to the metal grinding disc at least at point 4. These two half-shells at least surround the side surfaces and the outer peripheral surface of the grinding disc.

[0018] In addition, the present invention also relates to an outer cover element configured for use with a rotor according to the present invention or a grinding disc assembly according to the present invention.

[0019] A further aspect of the invention is a basic metal frame for a rotor, particularly a rotor according to the invention. The frame comprises: a grinding disc section having several grinding discs arranged side-by-side and spacer bushings respectively arranged between two adjacent grinding discs; a flow guide cage formed by longitudinal metal struts spaced apart from each other in a circumferential direction and extending along the direction of the rotor's rotation axis, longitudinal grooves arranged between the longitudinal struts, and annular metal end elements connected to the longitudinal struts; and several stabilizing elements arranged between the grinding discs or between the grinding discs and the end elements. Attached Figure Description

[0020] Furthermore, the present invention will now be described with reference to the accompanying drawings. The drawings show:

[0021] Figure 1 This is an exemplary diagram of the basic metal frame of a rotor according to the present disclosure.

[0022] Figure 2 for Figure 1 The basic framework in the diagram includes an example of a pre-installed grinding tool.

[0023] Figure 3 This is a perspective view of a rotor having an installed outer casing element according to one embodiment.

[0024] Figure 4 This is a side sectional view of the rotor according to this disclosure.

[0025] Figure 5a and Figure 5b A view of the grinding wheel according to this disclosure.

[0026] Figure 6An exemplary diagram of a metal basic frame for a rotor with stabilizing elements. Detailed Implementation

[0027] The working principle of a stirred ball mill is known and will not be elaborated here. A stirred ball mill typically has a stator and a rotor. Depending on the structural design, grinding tools in the form of pins or cams may be installed on the rotor. Additionally, grinding tools may be mounted on the inner wall of the stator, arranged axially offset from the rotor's grinding tools to allow the rotor to rotate. Between the stator and rotor is a grinding chamber where the grinding material is dispersed or ground as the rotor rotates around its central axis (vertical axis). In this case, grinding aids are typically used, such as ceramic balls located within the grinding chamber.

[0028] A filter screen is installed at the end of the discharge side to prevent grinding aids or larger solids from entering the discharge port and contaminating the product. The rotor is at least partially mounted around the filter screen, i.e., radially outward. To ensure product flow through the filter screen, the rotor around the screen is typically shaped as a flow guide cage. This cage prevents grinding aids from accumulating at the filter screen and obstructing the discharge of grinding materials. This cage shape is usually achieved by several axially arranged rods connected by circular sections to form a permeable hollow cylinder. On the other hand, the drive side (i.e.... Figure 1 (Right side) is connected to the drive shaft.

[0029] Figure 1 An exemplary basic frame 1 of a rotor according to this disclosure is shown. A rotor having the basic frame described herein can be used, but is not limited to, in a horizontally stirred ball mill, i.e., a grinding mill having a horizontally oriented rotating shaft. The basic frame 1 is constructed in a multi-piece configuration. In particular, the basic frame 1 can be implemented as a substantially hollow cylinder.

[0030] exist Figure 1 The flow guide cage 121 can be seen, which, as described above, is formed by several longitudinal supports 6 spaced apart from each other in the circumferential direction. The ends of these longitudinal supports are connected by annular end elements 7 or circular elements. Therefore, longitudinal grooves 61 are designed between the longitudinal supports 6, through which the grinding object or product can flow out. During operation, a filter screen (not shown) is radially built into the flow guide cage 121. Other structural configurations of the flow guide cage 121 are also possible, provided they allow the grinding object to flow through. The drive-side portion (i.e., the right side of the figure) is formed by one or more grinding discs 4 as a grinding disc frame section 111. These grinding discs are spaced apart from each other by spacer bushings 5 ​​to ensure uniform spacing between the grinding discs 4 or between the discharge-side grinding disc 4 and the flow guide cage 121. The last spacer bushing can also be designed as part of the flow guide cage 121.

[0031] The guide cage 121 and grinding disc frame section 111 (and, if necessary, spacer bushings 5) of the basic frame 1 may be made of metal, such as stainless steel. The metal basic frame 1 is the support structure for the rotor, which provides the rotor with the necessary stability and enables the efficient transmission of torque from the drive shaft, particularly to the grinding tool that can be fixed at the basic frame 1. Figure 2 It shows Figure 1 The basic frame 1 shown has mounted grinding tools 2, which are fixed in the longitudinal support 6 at the flow guide 121 and in the grinding disc section 111 at the radially upward grinding disc 4. In one embodiment, the grinding tools 2 are fixed by bolts. Alternatively, the grinding tools 2 themselves may have external threads, which allow them to be mounted in the basic frame 1, i.e., at the longitudinal support 6 of the flow guide 12 or at the grinding disc 4. These grinding tools may be made of plastic or ceramic (e.g., zirconium oxide (ZrO2) or silicon carbide (SiC)). Additionally, the grinding tools 2 themselves may have a basic structure, for example, made of metal, which may be coated, cast, or have a cover. The shape of the grinding tools 2 is... Figure 2 The grinding tool 2 is shown as a square. It agitates and moves the grinding aids, which may also be circular, trapezoidal, or mushroom-shaped, and have functional surfaces to guide the grinding aids in the desired axial or radial direction. The grinding disc 4 can be installed and replaced individually, thus ensuring a modular structure.

[0032] When processing certain materials, it is essential to ensure that no metal debris enters the product. Therefore, for example, when processing LFP (the cathode active material used in the production of batteries), the processing area should be kept metal-free. In other words, no metal debris should enter the grinding chamber. To this end, the metal surfaces of the basic frame 1 that may come into contact with the grinding object or grinding aids in the grinding chamber should be covered or protected; i.e., wear-resistant protection should be installed. This wear-resistant protection is achieved through at least one outer cover element, preferably several outer cover elements 3, such as… Figure 3 As shown.

[0033] In the simplest implementation, the basic framework can be as follows: Figure 1 The diagram shows a one-piece cylindrical outer cover element that can be pushed up above the base frame 1 to cover the surface of the base frame 1. An opening may be provided to secure the grinding tool 2 to the base frame after the outer cover element is pushed open. However, preferably, as... Figure 3As shown, several outer cover elements 3 are provided, which are adapted to the surface of the basic frame 1 and can cover or protect the surface as completely as possible. The outer cover elements 3 are not made of metal and can be loosely (or connectably) fixed to the basic frame 1. This fixing can be achieved by means of bolt connection, press connection, clamp connection or similar methods. Thus, the rotor and the basic frame 1 each have the same cage section 12 (or guide cage 121) and drive section 11 (or grinding disc frame section 111). These sections each represent axial sections along the axis of rotation.

[0034] When designing the outer cover element 3, different geometries in the cage section 12 and drive section 11 are considered by covering the longitudinal support column 6 and the annular end element 7 or grinding disc 4 with a perfectly matched outer cover element 3. Preferably, several outer cover elements 3 are provided at the grinding disc 4 and the longitudinal support column 6, or at one-piece or multi-piece circular end elements 7, which surround corresponding parts or sub-regions of the basic frame 1. For example, the shielding of the longitudinal support column 6 of the flow guide cage 121 can be achieved by several outer cover elements 3, which are bolted together or connected to the basic frame 1 itself. The annular end element 7 can be covered or protected by an arc-shaped outer cover element 3. If a press or clamp connection is used, it may be necessary to consider the different expansion conditions of the outer cover element and the underlying structure when heated to avoid plastic deformation and thus damage to the outer cover element 3.

[0035] The outer casing element 3 can be made of thermoplastic, thermosetting, or elastomer materials such as PA, PE, PU, ​​NBR, or fiber-reinforced plastics. Furthermore, depending on the selected material, the outer casing element 3 can be manufactured by machining, such as milling, turning, or drilling, by 3D printing, or as an injection molded part. Alternatively, the outer casing component can be coated, cast, or sprayed.

[0036] In this case, it should be noted that it is preferable to cover or substantially keep the larger metal surface of the basic frame 1 away from the flow of the object to be ground to prevent metal debris, i.e., wear, from occurring there. Since the bolt heads are preferably countersunk when the grinding tool 2 and / or the outer casing element 3 are bolted together, it is expected that not much metal debris will occur at this point. Alternatively, plastic or ceramic bolts can be used, or the bolts can be arranged internally. Alternatively, the grinding tool 2 can also be bonded or clamped to the basic frame 1 so that the connecting elements do not come into contact with the flow of the object to be ground.

[0037] The outer cover element 3 may have a recess or opening 31 provided for the grinding tool 2 to pass through. In addition, the outer cover element 3 may be divided into several outer cover elements that are clustered together to surround the basic frame 1 and the grinding tool 2.

[0038] Gaps may be provided between the outer casing elements 3, which allow thermal expansion during operation without plastic deformation. Additionally, these gaps allow expansion upon water absorption without plastic deformation. It is also advantageous to provide seals between the outer casing elements 3, between the outer casing elements 3 and the grinding tool 2, and / or between the outer casing elements 3 and the basic frame 1.

[0039] Figure 4 A side sectional view of the basic frame 1 is shown, which has a reference frame installed therein. Figure 3 The outer casing element 3 is as described above. Figure 4 The aforementioned axis of rotation is also shown in dashed lines, which is in... Figures 1 to 3 It is not explicitly shown in the text.

[0040] Figure 5a This is an exploded view of a grinding disc 4 having grinding tools 2 and an outer casing element 3 according to the present disclosure. The grinding disc 4 is made of metal, such as stainless steel, and has two side surfaces 41, a through hole 42 formed in the center of the grinding disc 4 for receiving a stirring shaft or drive shaft, and an outer peripheral surface 43. The grinding disc 4 may have one or more drilled holes for receiving bolts. Additionally, recesses and / or reinforcing ribs may be provided. Several grinding tools 2 are mounted on the outer peripheral surface, protruding radially outward from the outer peripheral surface 43. The outer casing element 3 at least surrounds the side surfaces 41 and the outer peripheral surface 43, except for the grinding tools 2. As can be seen from the exploded view, in this example, the grinding tools 2 and the outer casing element 3 are respectively secured to the grinding disc 4 by bolt connections.

[0041] Figure 5b The image shows a grinding disc 4 with an outer casing element 3 and a grinding tool 2 in its assembled state. The grinding disc 4 (with or without the outer casing element 3 and / or the grinding tool 2) can be provided as a separate spare part and, as described above, can be used to modularly form the basic frame 1 of the rotor using spacer bushings 5. Furthermore, individual grinding discs 4, grinding tools 2, or outer casing elements 4 can be replaced in case of wear.

[0042] The outer cover element 3 of the shown grinding disc assembly therefore has two plastic half-shells for covering the grinding disc. Each of these two half-shells is fixed to the metal grinding disc 4, wherein the two half-shells at least surround the side surface and outer peripheral surface of the grinding disc 4. Thus, the half-shells form the outer cover element 3. However, the outer cover element 3 can also be divided in other ways and consist of more than two parts, provided that it substantially covers or protects the metal surfaces in contact with the grinding object and grinding aids without a cover.

[0043] Figure 6 It shows Figure 1 A further embodiment of the basic metal frame 1 for the rotor shown. Additionally, according to... Figure 6 The implementation includes stabilizing elements 8, which are connected to the grinding disc 4 and the guide cage 121, for example, in the form of rods. Figure 6 In the diagram, the stabilizing element 8 is shown as a circular bar, which is arranged between the grinding discs 4 and between the grinding discs 4 and the flow guide cage 121 or its end element 7.

[0044] These stabilizing elements 8 can supplement the basic frame 1.

[0045] The stabilizing element 8 can be arranged as a single short element between the grinding discs 4 or designed as continuous rods passing through the grinding discs 4, with spacing or dividing elements between the grinding discs 4 if necessary. Preferably, the stabilizing element 8 is arranged near the outer periphery of the grinding discs 4. The stabilizing element 8 can also be designed as a multi-piece and, for example, consists of tie rods and pressure sleeves. Fixing at the basic frame 1 can be achieved using bolts and nuts through corresponding threads and drilled holes.

[0046] The stabilizing element 8 functions to stabilize and reinforce the basic frame 1. This reduces rotor deformation caused by external forces such as gravity. This is also advantageous because it allows for a very small gap between the rotating cage and the stationary filter screen inside the cage. A smaller gap between the filter screen and the cage makes it easier for the filter screen to block the grinding aids. This results in a high product throughput and efficiency for the machine.

[0047] Therefore, the stabilizing element 8 can function as a pull rod or push rod, thereby resulting in high design stiffness and achieving very low drive shaft flexural stress during horizontal operation.

[0048] Therefore, this basic frame 1 with stabilizing element 8 is also an aspect of this disclosure, wherein this special design makes it possible to provide a lightweight basic frame 1, which is particularly advantageous for shielding large stirred ball mills (e.g., rotor diameter of 40 cm or more).

[0049] Additionally, this disclosure includes a housing element 3 or a housing element assembly for a rotor as described above, and / or a grinding disc 4 and / or a grinding disc assembly. Such a housing element 3 or housing element assembly can be mounted on an existing basic frame, such as the basic frame described in this disclosure, to cover a metal surface, or it can replace a worn housing element.

[0050] Additionally, this disclosure also includes the use of the outer casing element 3 or outer casing element assembly for the rotor as described above, and / or a grinding disc 4 and / or a grinding disc assembly.

[0051] Therefore, the present invention provides a modular rotor for a stirred ball mill, which can also be used in metal-free process zones. Furthermore, the outer casing elements, grinding tools, or grinding discs can be replaced individually in case of wear. The metal components, i.e., the basic frame or skeleton of the rotor, consisting of the cage, grinding disc, and, where necessary, spacer bushings and / or stabilizing elements, are not subject to wear due to the casing, thus enabling product grinding without producing metal debris.

[0052] The outer casing can be shaped to form a cylinder and create an annular grinding gap between the rotor and the grinding container. The casing can be made of wear-resistant materials such as plastic or ceramic. Alternatively, the casing can be bolted to a metal structure and thus easily replaced in case of wear. However, the casing can also be secured in a shape-locking manner using a press-fit connection.

[0053] The outer casing components bear only very low loads because the grinding tools transfer the force to the supporting structure, i.e., the basic frame. The tie rod / push rod connects the grinding disc and the cage on a larger diameter and reinforces the structure, which results in very little axial deflection, thus allowing for a very small gap between the cage and the filter screen.

[0054] Furthermore, the hybrid structure of metal, plastic, and ceramic ensures a lightweight rotor while maintaining maximum rigidity. This also results in minimal bending of the drive shaft or rotor during horizontal operation and a shorter gap between the cage and the filter screen.

[0055] Although the invention has been shown and described in detail with the aid of the accompanying drawings and related description, such showing and detailed description should be understood as illustrative and exemplary, and not as limiting the invention. It should be understood that changes and modifications can be made by those skilled in the art without departing from the scope of the following claims. In particular, the invention also includes embodiments having any combination of the features mentioned or shown above for different aspects and / or implementations.

[0056] The invention also includes various features in the accompanying drawings, even if these features are shown in conjunction with other features in the drawings and / or not mentioned above.

[0057] Furthermore, the term "comprising" and its derivatives do not exclude other elements or steps. Similarly, the indefinite articles "a" or "an" and their derivatives do not exclude plural. The function of multiple features listed in the claims can be achieved by a single unit. In particular, terms such as "substantially," "about," "probably," etc., which combine characteristics or values, precisely define the characteristics or precisely define the values. All reference numerals in the claims should not be construed as limiting the scope of the claims.

[0058] List of icon numbers

[0059] 1. Basic Framework

[0060] 11 Drive Section

[0061] 111 Grinding disc frame section

[0062] 12-cage section

[0063] 121 Flow guide cage

[0064] 2 Grinding tools

[0065] 3. Outer casing components

[0066] 4 Grinding disc

[0067] 41 Side surface

[0068] 42 Through Hole

[0069] 43 Peripheral surface

[0070] 5. Spacer bushing

[0071] 6. Longitudinal supports

[0072] 61 Longitudinal groove

[0073] 7. End components

[0074] 8. Stabilizing components.

Claims

1. A rotor for a stirred ball mill, the rotor comprising: - Multi-piece metal basic frame (1). - Several grinding tools (2), said grinding tools being arranged at the metal basic frame (1), and - At least one non-metallic outer casing element (3). The at least one non-metallic outer casing element (3) is designed such that the surface of the metal basic frame (1) is covered or protected by the non-metallic outer casing element (3). A section of the rotor forms a cylindrical drive section (11), and the basic metal frame (1) forms a grinding disc frame section (111) within the drive section (11), the grinding disc frame section being formed by one or more spaced metal grinding discs (4). Each of the metal grinding discs (4) has two side surfaces, a through hole formed in the center of the metal grinding disc for receiving a stirring shaft that drives the rotor, and an outer peripheral surface, wherein several grinding tools of the grinding tools (2) are arranged on the outer peripheral surface, wherein the portion of the non-metallic outer cover element (3) for covering the metal grinding disc (4) is formed from two plastic half-shells, the plastic half-shells at least surrounding the side surfaces and the outer peripheral surface of the metal grinding disc (4).

2. The rotor according to claim 1, wherein at least a portion of the metal basic frame (1) is formed by one or more side-by-side metal grinding discs (4) and / or spacer bushings (5) and / or flow guide cages (121) respectively arranged between two adjacent metal grinding discs (4).

3. The rotor according to claim 1 or 2, wherein the rotor is arranged in a grinding chamber filled with the grinding object and grinding aids of the stirred ball mill during operation. The surfaces of the metal basic frame (1) covered by the non-metallic outer cover element (3) are those surfaces that would come into contact with the grinding object and the grinding aid when the rotor is used without the cover.

4. The rotor according to claim 1 or 2, wherein an opening (31) for the grinding tool (2) to pass through is provided in the at least one non-metallic outer casing element (3).

5. The rotor according to claim 1 or 2, wherein a section of the rotor forms a cylindrical cage section (12), wherein the basic metal frame (1) forms a flow guide cage (121) within the range of the cage section (12), the flow guide cage being formed by metal longitudinal supports (6) spaced apart from each other in a circumferential direction, the metal longitudinal supports extending in the direction of the rotation axis of the rotor, wherein longitudinal grooves (61) are designed between the metal longitudinal supports (6), wherein several grinding tools of the grinding tools (2) are arranged at the metal longitudinal supports (6), wherein a portion of the non-metallic outer cover element (3) for covering the metal longitudinal supports (6) is formed by the non-metallic outer cover element (3) covering the section of the metal longitudinal supports between the grinding tools (2).

6. The rotor according to claim 5, wherein the metal longitudinal support (6) of the flow guide cage (121) is connected by means of a pull rod / push rod to the metal grinding disc (4) of the drive section (11) adjacent to the flow guide cage (121).

7. The rotor according to claim 5, wherein the end of the metal basic frame (1) is formed by a metal annular end element (7) within the cage section (12), the metal annular end element being connected to the metal longitudinal support (6), and the non-metallic outer cover element (3) for covering the end element is formed by an arc-shaped element, the arc-shaped element being fixed at the end element on both sides.

8. The rotor according to claim 1 or 2, wherein the metal basic frame (1) further comprises several stabilizing elements (8) arranged between or through the metal grinding discs (4).

9. The rotor according to claim 1 or 2, wherein the non-metallic outer casing element (3) is shape-locked to the metal basic frame (1) by means of a press connection.

10. The rotor according to claim 1 or 2, wherein the non-metallic outer casing element (3) is made of thermoplastic, thermosetting, or elastomer, and / or The metal basic frame (1) is made of stainless steel, and / or the grinding tool (2) is made of ceramic or plastic.

11. The rotor according to claim 1 or 2, wherein the non-metallic outer casing element (3) is produced by machining, by 3D printing or as an injection molded part.

12. The rotor according to claim 9, wherein, The non-metallic outer casing element (3) is bolted to the metal basic frame (1).

13. The rotor according to claim 10, wherein, The non-metallic outer casing element (3) is made of PA, PE, PU, ​​NBR or fiber-reinforced plastic.

14. The rotor according to claim 10, wherein, The grinding tool (2) is made of zirconium oxide or silicon carbide.

15. The rotor according to claim 11, wherein, The non-metallic outer casing element (3) is produced by milling, turning or drilling.

16. A grinding disc assembly for a rotor, the grinding disc assembly having A metal grinding disc (4), the metal grinding disc having two side surfaces, a through hole formed in the center of the metal grinding disc for accommodating a stirring shaft, and an outer peripheral surface, Several grinding tools (2) are arranged on the outer peripheral surface, the grinding tools protruding radially outward from the outer peripheral surface, and Two plastic half-shells for covering the metal grinding disc (4), the plastic half-shells being fixed to the metal grinding disc (4), wherein the plastic half-shells at least surround the side surface and the outer peripheral surface of the metal grinding disc (4).

17. The grinding disc assembly according to claim 16, wherein, The rotor is the rotor according to any one of claims 1 to 15.

18. A non-metallic housing element (3) configured for use with a rotor according to any one of claims 1 to 15 or a grinding disc assembly according to claim 16 or 17.

19. A metal base frame for a rotor, the metal base frame having The grinding wheel frame section (111) has several metal grinding wheels (4) arranged side by side and spacer bushings (5) arranged between two adjacent metal grinding wheels (4). A flow guide cage (121) is formed by longitudinal metal supports (6) spaced apart from each other in a circumferential direction and extending along the rotation axis of the rotor, wherein longitudinal grooves (61) are designed between the longitudinal metal supports (6), and annular metal end elements (7) connected to the longitudinal metal supports (6); and Several stabilizing elements (8) are arranged between the metal grinding discs (4) or between the metal grinding discs (4) and the end elements (7).

20. The metal basic frame according to claim 19, wherein, The rotor is the rotor according to any one of claims 1 to 15.

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