A polishing disc and a polishing machine

Abstract

This application provides a grinding disc and a grinding machine, belonging to the field of grinding and mixing technology. The grinding disc has a first material passage hole, which connects the feed side and the discharge side of the grinding disc along the axial direction of the grinding disc. The wall surface of the first material passage hole includes a first surface, which is inclined relative to the axial direction of the grinding disc to prevent the grinding media from moving from the feed side to the discharge side of the grinding disc. In the grinding disc provided in this application, the first surface is inclined relative to the axial direction of the grinding disc, that is, the first surface is not parallel to the axial direction of the grinding disc, so that the first surface can prevent the grinding media from moving from the feed side to the discharge side of the grinding disc. Compared with grinding materials such as natural asphalt ore, the grinding media has a lower viscosity and is more easily hindered by the first surface. This helps to alleviate the problem of grinding media accumulating at the screen, leading to severe screen wear and clogging.

Description

Technical Field

[0001] This application relates to the field of grinding and mixing technology, and in particular to a grinding disc and a grinding machine. Background Technology

[0002] Natural bitumen ore generally needs to be ground and processed by a grinding mill before use. During operation, the screen on the discharge side of the grinding mill may experience severe wear and blockage, affecting the processing quality of the ground material and the grinding mill's efficiency. Summary of the Invention

[0003] In view of this, embodiments of this application aim to provide a grinding disc and a grinding machine to alleviate the degree of screen wear and clogging.

[0004] To achieve the above objectives, a first aspect of this application provides a grinding disc having a first feed hole that connects the feed side and the discharge side of the grinding disc along the axial direction of the grinding disc. The wall of the first feed hole includes a first surface that is inclined relative to the axial direction of the grinding disc to prevent the grinding medium from moving from the feed side of the grinding disc to the discharge side of the grinding disc.

[0005] Furthermore, the first surface is located on the side of the first feed hole opposite to the rotation direction of the grinding disc, and the first surface faces the feed side of the grinding disc. The grinding disc rotates so that the first surface pushes at least a portion of the grinding media that has moved along the feed direction back to the feed side.

[0006] Furthermore, the wall surface of the first feed hole also includes a second surface, which is located on the side of the first feed hole facing the rotation direction of the grinding disc and facing the discharge side of the grinding disc. The grinding disc rotates to move at least a portion of the grinding media along the second surface from the discharge side of the grinding disc to the feed side of the grinding disc.

[0007] Furthermore, the first surface extending direction forms a first angle with the axial direction of the grinding disc, the first angle being 15° to 45°; and / or, the second surface extending direction forms a second angle with the axial direction of the grinding disc, the second angle being 15° to 45°.

[0008] Furthermore, the first surface extends at a first angle to the axial direction of the grinding disc, and the second surface extends at a second angle to the axial direction of the grinding disc, wherein the first angle and the second angle are equal.

[0009] Furthermore, the distance between the first surface and the second surface gradually increases in the radially outward direction along the grinding disc.

[0010] Furthermore, the first feed hole extends along a preset direction, which intersects the axial direction of the grinding disc, and the cross-section of the first feed hole along the preset direction is circular, elliptical, plum blossom-shaped, or polygonal.

[0011] Furthermore, there are multiple first material passage holes, which are evenly arranged around the circumference of the grinding disc.

[0012] A second aspect of this application provides a grinding machine, comprising:

[0013] Grinding cylinder;

[0014] The rotating shaft is rotatably connected to the grinding cylinder;

[0015] A first grinding disc is located inside the grinding cylinder and is connected to the rotating shaft. The first grinding disc is any of the grinding discs described above.

[0016] The second grinding disc is located inside the grinding cylinder and is connected to the rotating shaft. The second grinding disc has a second material passage hole, and the wall surface of the second material passage hole is parallel to the axial direction of the rotating shaft.

[0017] Furthermore, when projected axially along the axis of rotation, the projected outer contour of the second grinding disk may be different from or the same as the projected outer contour of the first grinding disk.

[0018] Furthermore, along the axial direction of the second grinding disc, the projected outer contour of the second grinding disc includes three straight line segments arranged circumferentially along the second grinding disc, and the angle between the extension direction of at least one of the straight line segments and the extension directions of the two adjacent straight line segments is an acute angle.

[0019] Furthermore, the first grinding disc is circular in shape.

[0020] Furthermore, there are multiple first grinding discs, which are arranged along the axial direction of the rotating shaft, and at least one second grinding disc is provided between two adjacent first grinding discs.

[0021] Furthermore, among the first grinding disc and the second grinding disc, the first grinding disc is closest to the discharge side of the grinder, and / or the second grinding disc is closest to the feed side of the grinder.

[0022] The grinding disc provided in this embodiment has a first surface that is inclined relative to the grinding disc's axial direction, meaning the first surface is not parallel to the grinding disc's axial direction. This allows the first surface to impede the movement of the grinding media from the feed side to the discharge side of the grinding disc. Compared to grinding materials such as natural bitumen ore, the grinding media has a lower viscosity and is more easily impeded by the first surface. This helps alleviate the problem of grinding media accumulating at the screen, leading to severe screen wear and clogging. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the grinding machine in the embodiments of this application;

[0024] Figure 2 This is a schematic diagram of the structure of the first grinding disc in an embodiment of this application;

[0025] Figure 3 This is a schematic diagram of the structure of the second grinding disc in an embodiment of this application;

[0026] Figure 4 This is a schematic diagram of the structure in which the first grinding disc and the second grinding disc are connected to the rotating shaft in an embodiment of this application.

[0027] Explanation of reference numerals in the attached drawings: Grinding cylinder 1; Rotating shaft 2; First grinding disc 3; First feed hole 31; First surface 311; Second surface 312; Transition surface 313; Rounded corner 314; Second grinding disc 4; Second feed hole 41; Grinding disc rotation direction 5. Detailed Implementation

[0028] It should be noted that, unless otherwise specified, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed descriptions in the specific implementation should be understood as explanations of the purpose of this application and should not be regarded as undue limitations on this application.

[0029] As part of the inventive concept of this application, before describing the embodiments of this application, it is necessary to analyze the reasons why screens may experience severe wear and blockage in related technologies, and obtain the technical solutions of the embodiments of this application through reasonable analysis.

[0030] In related technologies, a grinding mill includes a grinding cylinder containing grinding media. After the grinding material enters the grinding cylinder through the feed side, the grinding media and the grinding material grind each other inside the cylinder. The grinding material has a lower hardness than the grinding media, and the particle size of the grinding material decreases after grinding. The ground grinding material is discharged from the grinding cylinder through the discharge side. The grinding mill also includes a separator and a rotating shaft rotatably connected to the grinding cylinder. The separator is connected to the end of the rotating shaft facing the discharge side and has a screen. The screen is used to filter the grinding material, allowing smaller particles to be discharged from the discharge side, while larger particles continue to be ground inside the grinding cylinder. During operation, the grinding material continuously enters the grinding cylinder, and the grinding media easily flows towards the discharge side under the thrust of the feed material. The grinding media has high hardness and large particle size, easily accumulating at the screen, causing severe wear and clogging of the screen.

[0031] This application provides a grinding machine; please refer to... Figure 1 The grinding machine includes a grinding cylinder 1, a rotating shaft 2, a first grinding disc 3 and a second grinding disc 4. The rotating shaft 2 is rotatably connected to the grinding cylinder 1. The first grinding disc 3 is located inside the grinding cylinder 1 and connected to the rotating shaft 2. The second grinding disc 4 is located inside the grinding cylinder 1 and connected to the rotating shaft 2.

[0032] In one embodiment, please continue to refer to Figure 1 The rotating shaft 2 is positioned along the axis of the grinding cylinder 1. This arrangement ensures that the grinding material is ground evenly and thoroughly, guaranteeing that the ground material particles are uniform.

[0033] The first grinding disc 3 in this embodiment is any of the following types of grinding discs.

[0034] Please see Figure 2 The grinding disc provided in this embodiment has a first feed hole 31, which connects the feed side and the discharge side of the grinding disc along the axial direction. The wall of the first feed hole 31 includes a first surface 311, which is inclined relative to the axial direction of the grinding disc to prevent the grinding media from moving from the feed side to the discharge side. This arrangement, with the first surface 311 inclined relative to the axial direction of the grinding disc, effectively prevents the grinding media from moving from the feed side to the discharge side. Compared to grinding materials such as natural asphalt ore, the grinding media has a lower viscosity and is more easily hindered by the first surface 311. This helps alleviate the problem of grinding media accumulating at the screen, leading to severe screen wear and clogging.

[0035] It should be explained that the first surface 311 is inclined to the axial direction of the grinding disc, that is, the first surface 311 is not parallel to the axial direction of the grinding disc.

[0036] In one embodiment, please refer to... Figure 2 The first surface 311 is located on the side of the first feed hole 31 opposite to the rotation direction 5 of the grinding disc. The first surface 311 faces the feed side of the grinding disc. The grinding disc rotates so that the first surface 311 pushes at least a portion of the grinding media that has moved along the feed direction back to the feed side. This arrangement allows the first surface 311 to generate a pushing force towards the feed side during the rotation of the grinding disc. This helps to alleviate the accumulation of grinding media at the screen, thereby helping to alleviate the problem of screen wear and clogging caused by the grinding media.

[0037] It should be noted that, compared to grinding materials such as natural asphalt ore, grinding media have lower viscosity and are more likely to flow towards the feed side under the thrust of the first surface 311.

[0038] It should be noted that the feeding direction is from the feed side to the discharge side.

[0039] In one embodiment, please refer to... Figure 2 The wall surface of the first feed hole 31 also includes a second surface 312. The second surface 312 is located on the side of the first feed hole 31 facing the rotation direction 5 of the grinding disc, and faces the discharge side of the grinding disc. The grinding disc rotates so that at least a portion of the grinding media moves along the second surface 312 from the discharge side to the feed side of the grinding disc. This arrangement allows the rotation of the grinding disc to generate a suction force on the second surface 312 towards the feed side. Compared to grinding materials such as natural asphalt ore, the grinding media has a lower viscosity and flows more easily towards the feed side under the action of the second surface 312. This helps to alleviate the accumulation of grinding media at the screen, thereby helping to alleviate the problem of screen wear and clogging caused by the grinding media.

[0040] In one embodiment, the second surface 312 may be parallel to the axial direction of the grinding disk.

[0041] It should be noted that the shapes of the first surface 311 and the second surface 312 are not limited.

[0042] In one embodiment, the first surface 311 can be a wavy, stepped, sawtooth, arc-shaped, or planar shape.

[0043] In one embodiment, the second surface 312 can be wavy, stepped, sawtooth, arc-shaped, or planar.

[0044] In one embodiment, please continue to refer to Figure 2 Both the first surface 311 and the second surface 312 are planar.

[0045] In one embodiment, please continue to refer to Figure 2The extension direction of the first surface 311 forms a first angle with the axial direction of the grinding disc, which is 15° to 45°. This arrangement ensures that the first surface 311 strongly impedes the flow of the grinding media towards the discharge side, while also ensuring smooth flow of the grinding material within the first feed hole 31. For example, the first angle can be 22.5°, 15°, 30°, or 45°.

[0046] It should be noted that the extension direction of the first surface 311 is from the inside to the outside, the inside of the first surface 311 is the side close to the rotating shaft 2, and the outside of the first surface 311 is the side away from the rotating shaft 2.

[0047] In one embodiment, please continue to refer to Figure 2 The first surface 311 is a plane, and the angle between the first surface 311 and the axial direction of the grinding disc is the first angle.

[0048] In one embodiment, please continue to refer to Figure 2 The extension direction of the second surface 312 forms a second angle with the axial direction of the grinding disc, which is 15° to 45°. This arrangement ensures that the second surface 312 strongly impedes the flow of the grinding media towards the discharge side, while also ensuring smooth flow of the grinding material within the first feed hole 31. For example, the second angle can be 22.5°, 15°, 30°, or 45°.

[0049] It should be noted that the extension direction of the second surface 312 is from the inside of the first surface 312 to the outside. The inside of the first surface 312 is the side closer to the rotating shaft 2, and the outside of the first surface 312 is the side away from the rotating shaft 2.

[0050] In one embodiment, please continue to refer to Figure 2 The first surface 312 is a plane, and the angle between the first surface 312 and the axial direction of the grinding disc is the first angle.

[0051] It should be noted that the size of the first and second included angles is selected based on the material of the grinding media, the shape of the grinding media particles, and the particle size.

[0052] In one embodiment, the grinding media may be made of cast iron, alloy, alumina, silicon carbide, or ceramics.

[0053] In one embodiment, the grinding media may be shaped as a sphere, a frustum, a cylindrical ball, or a short round bar, or a combination of one or more of these.

[0054] In one embodiment, please continue to refer to Figure 2 The first included angle and the second included angle are of equal size. This arrangement facilitates the machining and manufacturing of the first feed hole 31.

[0055] In one embodiment, please continue to refer to Figure 2 The first feed hole 31 is a cylindrical through hole. This design allows the first feed hole 31 to be formed by die stamping. Specifically, the axial direction of the first feed hole 31 forms a third angle with the axial direction of the grinding disc, and the first, second, and third angles are equal in size.

[0056] In one embodiment, please continue to refer to Figure 2 The wall of the first feed hole 31 also includes a transition surface 313, which connects the first surface 311 and the second surface 312.

[0057] In one embodiment, please continue to refer to Figure 2 The transition surface 313 has a rounded corner 314 at the connection with the first surface 311. This arrangement helps to alleviate the possibility of abrasive materials and abrasive media accumulating at the edge of the first feed hole 31.

[0058] In one embodiment, please continue to refer to Figure 2 The transition surface 313 and the second surface 312 have a rounded corner 314 at the connection. This arrangement helps to alleviate the possibility of abrasive materials and abrasive media accumulating at the edge of the first feed hole 31.

[0059] In one embodiment, please continue to refer to Figure 2 Along the radial outward direction of the grinding disc, the distance between the first surface 311 and the second surface 312 gradually increases. This arrangement ensures that the first surface 311 and the second surface 312 both impede the grinding media and facilitate the passage of grinding materials through the first feed hole 31.

[0060] Specifically, in one embodiment, please continue to refer to... Figure 2 The plane containing the inner side of the first surface 311 and the axis of rotation of the grinding disc is called the first reference plane, and the outer side of the first surface 311 is away from the first reference plane along the direction of rotation 5 of the grinding disc. The plane containing the inner side of the second surface 312 and the axis of rotation of the grinding disc is called the second reference plane, and the outer side of the second surface 312 is away from the second reference plane along the direction of rotation 5 of the grinding disc.

[0061] In one embodiment, the first feed hole 31 extends along a preset direction, which intersects with the axial direction of the grinding disc. The cross-section of the first feed hole 31 along the preset direction is circular, elliptical, plum blossom-shaped, or polygonal.

[0062] In one embodiment, please continue to refer to Figure 2 The number of first material passage holes 31 is multiple, and these multiple first material passage holes 31 are evenly arranged along the circumference of the grinding disc. This arrangement not only allows the grinding material to flow smoothly, but also effectively reduces the accumulation of grinding media at the screen.

[0063] In one embodiment, please continue to refer to Figure 2 The number of first feed holes 31 is preferably 6 to 8. For example, the number of first feed holes 31 is 8.

[0064] In one embodiment, please refer to Figure 3 The second grinding disc 4 has a second material passage hole 41, the wall of which is parallel to the axis of the rotating shaft 2. This arrangement ensures that the second material passage hole 41 does not significantly obstruct the flow of the grinding material, thus preventing low grinding efficiency. The first grinding disc 3 and the second grinding disc 4 work together to effectively reduce the accumulation of grinding media at the screen while maintaining the grinding efficiency of the mill.

[0065] In one embodiment, please refer to Figures 2-4 Projected along the axial direction of the rotating shaft 2, the outer contour of the second grinding disc 4 differs in shape from that of the first grinding disc 3. This arrangement facilitates the formation of turbulence between the grinding material and the grinding media during flow, ensuring thorough grinding of the material.

[0066] In one embodiment, the projected outer contour of the second grinding disk 4 along the axial direction of the rotating shaft 2 may have the same shape as the projected outer contour of the first grinding disk 3.

[0067] In one embodiment, the second grinding disc 4 can be elliptical, plum blossom-shaped, or polygonal in shape.

[0068] In one embodiment, please Figure 3 and Figure 4 Along the axial direction of the second grinding disc 4, the projected outer contour of the second grinding disc 4 includes three straight line segments arranged circumferentially along the second grinding disc 4, and the angle between the extension direction of at least one straight line segment and the extension directions of two adjacent straight line segments is an acute angle. This arrangement creates a large gap between the edge of the second grinding disc 4 and the grinding cylinder 1, facilitating the smooth flow of the grinding material within the grinding cylinder 1. The combined use of the second grinding disc 4 and the first grinding disc 3 can alleviate the accumulation of grinding media at the screen and enable the grinding machine to achieve high working efficiency.

[0069] In one embodiment, please Figures 2-4Along the axial direction of the second grinding disc 4, the projected outer contour of the second grinding disc 4 includes three straight line segments arranged circumferentially along the second grinding disc 4, and the angle between the extension direction of at least one straight line segment and the extension directions of two adjacent straight line segments is an acute angle. The first grinding disc 3 is circular in shape. This arrangement results in a smaller gap between the edge of the first grinding disc 3 and the grinding cylinder 1, which, in conjunction with the first material passage 31, significantly hinders the flow of the grinding media towards the discharge side. Furthermore, since the second grinding disc 4 does not significantly hinder the flow of the grinding material, the cooperation between the first grinding disc 3 and the second grinding disc 4 improves both the grinding effect and the working efficiency of the grinding machine.

[0070] In one embodiment, along the axial direction of the second grinding disk 4, the projected outer contour of the second grinding disk 4 may include multiple straight line segments arranged circumferentially along the second grinding disk 4.

[0071] In one embodiment, please refer to Figure 4 The projection profile of the second grinding disc 4 along the axis of rotation 2 is located within the projection profile of the first grinding disc 3 along the axis of rotation 2. This arrangement can improve the obstruction effect of the first grinding disc 3 on the flow of grinding media to the discharge side.

[0072] In one embodiment, please continue to refer to Figure 4 The diameter of the first grinding disc 3 is the same as the diameter of the outer circle of the second grinding disc 4.

[0073] In one embodiment, please continue to refer to Figure 4 There are multiple first grinding discs 3, which are arranged axially along the rotating shaft 2. At least one second grinding disc 4 is provided between two adjacent first grinding discs 3. This arrangement allows the grinding material to flow more evenly in the grinding cylinder 1 and facilitates the formation of turbulence between the grinding material and the grinding medium during the flow process, so that the grinding material is fully ground.

[0074] In one embodiment, a plurality of first grinding discs 3 are arranged adjacent to each other.

[0075] In one embodiment, please continue to refer to Figure 4 In the first grinding disc 3 and the second grinding disc 4, the second grinding disc 4 is closest to the feed side of the grinder. This arrangement ensures that the material being ground is not significantly obstructed during its entry into the grinder, thereby guaranteeing the grinder's working efficiency.

[0076] It should be explained that unground material particles are relatively large and will encounter significant resistance during flow. If the first grinding disc 3 is closest to the feed side of the grinder in the first grinding disc 3 and the second grinding disc 4, the first grinding disc 3 will exert a stronger resistance to the material being ground.

[0077] In one embodiment, please continue to refer to Figure 4 In the first grinding disc 3 and the second grinding disc 4, the first grinding disc 3 is closest to the discharge side of the grinder. This arrangement ensures that the distance between the first grinding disc 3, which is closest to the discharge side of the grinder, is relatively small, which can effectively reduce the accumulation of grinding media at the screen.

[0078] It should be explained that less grinding media accumulates on the first grinding disc 3 near the discharge side, and the accumulation gradually increases in the feeding direction. Therefore, the smaller the distance between the first grinding disc 3, which is closest to the discharge side of the grinder, and the screen, the less grinding media accumulates at the screen.

[0079] In one embodiment, please continue to refer to Figure 4 There are three first grinding discs 3. This arrangement ensures that the grinding media passes through all three first grinding discs 3 sequentially as it flows towards the discharge side, effectively reducing the accumulation of grinding media at the screen. Furthermore, the three first grinding discs 3 do not significantly obstruct the flow of the grinding material within the grinding cylinder 1, thus guaranteeing the working efficiency of the grinder.

[0080] In one embodiment, please continue to refer to Figure 4 Two second grinding discs 4 are arranged to the left of the leftmost first grinding disc 3, two second grinding discs 4 are arranged between the middle first grinding disc 3 and the leftmost first grinding disc 3, and one second grinding disc 4 is arranged between the rightmost first grinding disc 3 and the middle first grinding disc 3. This arrangement can ensure the smooth flow of the grinding material and effectively reduce the accumulation of grinding media at the screen.

[0081] In one embodiment, please refer to Figure 4 The central axis of the first grinding disc 3 coincides with the axis of the rotating shaft 2.

[0082] With this structural design, the rotating shaft 2 can rotate smoothly during the operation of the grinding machine.

[0083] In one embodiment, please refer to Figure 4 The central axis of the second grinding disc 4 coincides with the axis of the rotating shaft 2.

[0084] With this structural design, the rotating shaft 2 can rotate smoothly during the operation of the grinding machine.

[0085] The various embodiments / implementations provided in this application can be combined with each other without creating contradictions.

[0086] The above are merely preferred embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A grinding disc, characterized in that, The grinding disc has a first feed hole, which connects the feed side and the discharge side of the grinding disc along the axial direction of the grinding disc. The wall of the first feed hole includes a first surface, which is inclined relative to the axial direction of the grinding disc to prevent the grinding medium from moving from the feed side of the grinding disc to the discharge side of the grinding disc. The first surface is located on the side of the first feed hole opposite to the rotation direction of the grinding disc, and the first surface faces the feed side of the grinding disc. The grinding disc rotates so that the first surface pushes at least a portion of the grinding media that has moved along the feed direction back to the feed side. The first surface is a plane; The wall of the first feed hole also includes a second surface, which is located on the side of the first feed hole facing the rotation direction of the grinding disc. The second surface faces the discharge side of the grinding disc. The grinding disc rotates so that at least a portion of the grinding media moves along the second surface from the discharge side of the grinding disc to the feed side of the grinding disc. The grinding media has a lower viscosity than the natural asphalt ore grinding material.

2. The grinding disc according to claim 1, characterized in that, The first surface extends at a first angle to the axial direction of the grinding disc, the first angle being 15° to 45°; and / or, the second surface extends at a second angle to the axial direction of the grinding disc, the second angle being 15° to 45°.

3. The grinding disc according to claim 1, characterized in that, The first surface extends at a first angle to the axial direction of the grinding disc, and the second surface extends at a second angle to the axial direction of the grinding disc, wherein the first angle and the second angle are equal.

4. The grinding disc according to any one of claims 1 to 3, characterized in that, The distance between the first surface and the second surface gradually increases in the radial outward direction along the grinding disc.

5. The grinding disc according to any one of claims 1 to 3, characterized in that, The first feed hole extends along a preset direction, which intersects the axial direction of the grinding disc. The cross-section of the first feed hole along the preset direction is circular, elliptical, plum blossom-shaped, or polygonal.

6. The grinding disc according to any one of claims 1 to 3, characterized in that, The number of the first material passage holes is multiple, and the multiple first material passage holes are evenly arranged along the circumference of the grinding disc.

7. A grinding mill, characterized in that, include: Grinding cylinder; The rotating shaft is rotatably connected to the grinding cylinder; A first grinding disc is located inside the grinding cylinder and is connected to the rotating shaft. The first grinding disc is the grinding disc according to any one of claims 1 to 6. as well as The second grinding disc is located inside the grinding cylinder and is connected to the rotating shaft. The second grinding disc has a second material passage hole, and the wall surface of the second material passage hole is parallel to the axial direction of the rotating shaft.

8. The grinding machine according to claim 7, characterized in that, Projecting along the axial direction of the rotating shaft, the projected outer contour of the second grinding disk may be different from or the same as the projected outer contour of the first grinding disk.

9. The grinding machine according to claim 8, characterized in that, Along the axial direction of the second grinding disk, the projected outer contour of the second grinding disk includes three straight line segments arranged circumferentially along the second grinding disk, and the angle between the extension direction of at least one of the straight line segments and the extension directions of the two adjacent straight line segments is an acute angle.

10. The grinding machine according to claim 9, characterized in that, The first grinding disc is circular in shape.

11. The grinding machine according to any one of claims 7 to 10, characterized in that, The number of the first grinding discs is multiple, and the multiple first grinding discs are arranged along the axial direction of the rotating shaft. At least one second grinding disc is provided between two adjacent first grinding discs.

12. The grinding machine according to any one of claims 7 to 10, characterized in that, Of the first grinding disc and the second grinding disc, the first grinding disc is closest to the discharge side of the grinder, and / or the second grinding disc is closest to the feed side of the grinder.

Images