Grinding disc and fine grinding machine with same

Abstract

The invention provides a grinding disc and a fine grinding machine with the grinding disc, and the grinding disc comprises a shaft hole, a grinding disc body and a plurality of grinding blades, and the axis of the shaft hole coincides with the axis of the grinding disc body; the first hole group comprises a plurality of first material leakage holes, the first material leakage holes are annularly formed in the periphery of the shaft hole at intervals, and included angles are formed between the axes of the first material leakage holes and the axis of the grinding disc; the second hole group comprises a plurality of second material leakage holes, the second material leakage holes are annularly formed in the periphery of the first hole group at intervals, and included angles are formed between the axes of the second material leakage holes and the axis of the grinding disc; and the flowing direction of the slurry flowing through the first hole group is opposite to the flowing direction of the slurry flowing through the second hole group. By means of the technical scheme, the problem that in the prior art, a fine grinding machine is poor in grinding efficiency can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of grinding equipment, in particular to a grinding disc and a fine grinder having the same. Background Art

[0002] Coal-water slurry is a mixture of coal, water and chemical additives in a certain proportion. It has good fluidity and stability. It can be used as a clean fuel with high efficiency and low pollution. It can also be used as a gasification raw material in the coal chemical industry. Increasing the concentration of coal-water slurry can improve the fuel combustion efficiency.

[0003] Coal-water slurry needs to be ground in a fine grinder during the preparation process. A plurality of grinding discs are arranged at intervals in the fine grinder, and a grinding structure is arranged on the surface of the grinding disc. The material to be ground enters between two adjacent grinding discs for centrifugal motion so as to grind the slurry through the grinding structure. In the prior art, when the coal-water slurry passes through the grinding discs, the flow rate efficiency of the slurry between the two grinding discs is low, resulting in poor circulation efficiency of the solid part in the slurry between the grinding discs, the grinding work takes a lot of time, and the grinding efficiency is low. Summary of the invention

[0004] The invention provides a grinding disc and a fine grinder having the same, so as to solve the problem of poor grinding efficiency of the fine grinder in the prior art.

[0005] According to one aspect of the present invention, a grinding disc is provided, which comprises: an axial hole, the axis of the axial hole coincides with the axis of the grinding disc; a first hole group, the first hole group comprises a plurality of first leakage holes, the plurality of first leakage holes are arranged at annular intervals on the outer periphery of the axial hole, and an angle is formed between the axes of the first leakage holes and the axis of the grinding disc; a second hole group, the second hole group comprises a plurality of second leakage holes, the plurality of second leakage holes are arranged at annular intervals on the outer periphery of the first hole group, and an angle is formed between the axes of the second leakage holes and the axis of the grinding disc; wherein the flow direction of the slurry when flowing through the first hole group is opposite to the flow direction when flowing through the second hole group.

[0006] Furthermore, there is a first angle α between the axis of the first leakage hole and the axis of the grinding disk, and the angle of the first angle α is between 5° and 25°. There is a second angle β between the axis of the second leakage hole and the axis of the grinding disk, and the angle of the second angle β is between 5° and 25°.

[0007] Further, the flow area of ​​the first hole group is equal to the flow area of ​​the second hole group.

[0008] Further, the flow area of ​​the first leakage holes is greater than the flow area of ​​the second leakage holes, and the number of the first leakage holes is less than the number of the second leakage holes.

[0009] Furthermore, the outer periphery of the first hole group forms a separating ring, the first hole group and the second hole group are arranged on both sides of the separating ring opposite to each other, and the grinding disc is divided into a first part and a second part by the separating ring, the first part is located on the inner side of the separating ring, and the second part is located on the outer side of the separating ring, and the weight of the first part is equal to the weight of the second part.

[0010] Further, the angle of the first angle α is equal to the angle of the second angle β.

[0011] Furthermore, the grinding disc also includes a plurality of third leakage holes, the extension direction of the axes of the third leakage holes is the same as the extension direction of the axis of the grinding disc, and the third leakage holes are arranged between two adjacent first leakage holes and / or between two adjacent second leakage holes.

[0012] Furthermore, along the radial direction of the grinding disc, each first leakage hole is correspondingly provided with at least one second leakage hole.

[0013] According to another aspect of the present invention, a fine grinder is provided, which comprises: a shell; a grinding assembly, the grinding assembly comprising a driving member, a transmission shaft and a plurality of grinding discs, the grinding discs are the above-mentioned grinding discs, the transmission shaft and the grinding discs are both arranged in the shell, the plurality of grinding discs are all sleeved on the transmission shaft through axial holes, the plurality of grinding discs are arranged at intervals along the axial direction of the transmission shaft, and one end of the transmission shaft extends out of the shell and is drivingly connected to the driving member.

[0014] Furthermore, the spacing between each grinding disc is equal, and two adjacent grinding discs are symmetrically arranged along a plane perpendicular to the axis of the transmission shaft.

[0015] According to the technical solution of the invention, the grinding disc includes an axial hole, a first hole group and a second hole group. The axial hole is used to cooperate with the driving member to drive the grinding disc to rotate, and the solid matter in the slurry performs centrifugal motion away from the axis direction on the surface of the grinding disc, that is, flows from the first hole group to the second hole group. The first leakage hole and the second leakage hole are arranged in opposite directions, so that the flow direction of the slurry when flowing through the first hole group is opposite to the flow direction when flowing through the second hole group. When the slurry flows through the first hole group, it can flow through the first leakage hole under the action of the first hole group, and flow through the grinding disc again under the action of the second leakage hole, forcing the slurry to circulate around the grinding disc during the centrifugal motion, thereby improving the flow efficiency of the slurry, and then improving the grinding efficiency of the grinding disc, so that the water-coal slurry is ground more fully and the use effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1A schematic structural diagram of the grinding disc provided by the present invention is shown;

[0018] Figure 2 A front view of the grinding disc provided by the present invention is shown;

[0019] Figure 3 A partial cross-sectional view of the grinding disc provided by the present invention at a section of a first reference surface is shown;

[0020] Figure 4 A partial cross-sectional view of the grinding disc provided by the present invention at a section of the second reference surface is shown;

[0021] Figure 5 A front view of the grinding disc provided by the present invention when the third material leakage hole is provided;

[0022] Figure 6 A partial cross-sectional view of the fine grinding machine provided by the present invention is shown.

[0023] The above drawings include the following reference numerals:

[0024] 10. Shaft hole;

[0025] 20. The first leakage hole;

[0026] 30. The second leakage hole;

[0027] 40. The third leakage hole;

[0028] 100, housing; 200, transmission shaft; 01, separation ring. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] like Figure 1 to Figure 2As shown, an embodiment of the present invention provides a grinding disc, which includes an axial hole 10, a first hole group and a second hole group. The axis of the axial hole 10 coincides with the axis of the grinding disc, the first hole group includes a plurality of first leakage holes 20, the plurality of first leakage holes 20 are arranged at annular intervals on the periphery of the axial hole 10, and an angle is formed between the axis of the first leakage holes 20 and the axis of the grinding disc; the second hole group includes a plurality of second leakage holes 30, the plurality of second leakage holes 30 are arranged at annular intervals on the periphery of the first hole group, and an angle is formed between the axis of the second leakage holes 30 and the axis of the grinding disc. The flow direction of the slurry when flowing through the first hole group is opposite to the flow direction when flowing through the second hole group.

[0031] It should be noted that, in the radial direction of the grinding disc, the plane orthogonal to the line passing through the center of the first leakage hole 20 and the axis of the grinding disc and passing through the first leakage hole 20 is the first reference plane. In this application, "the axis of the first leakage hole 20 and the axis of the grinding disc have an angle" can be understood as that the grinding disc is at a section of the first reference plane, with reference to Figure 3 As shown, the two side walls of the first leakage hole 20 have an angle with the axis of the grinding disk, that is, the first leakage hole 20 is arranged tilted; the plane orthogonal to the line passing through the center of the second leakage hole 30 and the axis of the grinding disk and passing through the second leakage hole 30 is the second reference plane. In this application, "the axis of the second leakage hole 30 has an angle with the axis of the grinding disk" can be understood as that the grinding disk is at a section of the second reference plane, with reference to Figure 4 As shown, the two side walls of the second leakage hole 30 have an angle with the axis of the grinding disc, that is, the second leakage hole 30 is arranged obliquely. When the grinding disc rotates in the fine grinder, due to the inclined arrangement of the plurality of first leakage holes 20 of the first hole group, the side walls of the first leakage holes 20 will push the slurry in the fine grinder to flow through the first leakage holes 20. Similarly, the side walls of the second leakage holes 30 will push the slurry in the fine grinder to flow through the second leakage holes 30.

[0032] In the present application, the inclination direction of any first leakage hole 20 on the same side of the radial tangent of the grinding disk is opposite to the inclination direction of any second leakage hole 30 along the midline perpendicular to the radial tangent, that is, the first leakage hole 20 and the second leakage hole 30 are arranged in opposite directions. In this way, the flow direction of the slurry when flowing through the first hole group is opposite to the flow direction when flowing through the second hole group.

[0033] The technical solution of the present invention is applied, and the grinding disc includes an axial hole 10, a first hole group and a second hole group. The axial hole 10 is used to cooperate with the transmission shaft 200 to drive the grinding disc to rotate, and the solid matter in the slurry performs centrifugal motion away from the axis direction on the surface of the grinding disc, that is, flows from the first hole group to the second hole group. The first leakage hole 20 and the second leakage hole 30 are arranged in opposite directions, so that the flow direction of the slurry when flowing through the first hole group is opposite to the flow direction when flowing through the second hole group. When the slurry flows through the first hole group, it can flow through the first leakage hole 20 under the action of the first hole group, and flow through the grinding disc again under the action of the second leakage hole 30, forcing the slurry to circulate around the grinding disc during the centrifugal motion, thereby improving the flow efficiency of the slurry, and then improving the grinding efficiency of the grinding disc, so that the water-coal slurry is ground more fully and the use effect is better.

[0034] Specifically in the present application, there is a first angle α between the axis of the first leakage hole 20 and the axis of the grinding disc, and the angle of the first angle α is between 5° and 25°. If α is less than 5°, the first leakage hole 20 has a poor driving effect on the slurry and cannot improve the material circulation efficiency; if α is greater than 25°, although the first leakage hole 20 has a good driving effect on the slurry and can improve the material circulation efficiency at a single grinding disc, when it cooperates with the second leakage hole 30, more slurry will be involved in the circulation, affecting the circulation of slurry between multiple grinding discs. In the present application, by setting the angle of the first angle α between 5° and 25°, it can ensure that the slurry has a good circulation effect when flowing through the first leakage hole 20 and the second leakage hole 30, while ensuring the circulation effect of the slurry between multiple grinding discs. Specifically, α can be 5°, 15°, 20° or 25°.

[0035] Furthermore, there is a second angle β between the axis of the second leakage hole 30 and the axis of the grinding disc, and the angle of the second angle β is between 5° and 25°. Similarly, the first leakage hole 20 and the second leakage hole 30 can ensure that the slurry has a good circulation effect when flowing through the first leakage hole 20 and the second leakage hole 30, and at the same time ensure the circulation effect of the slurry between multiple grinding discs. Specifically, β can be 5°, 15°, 20° or 25°.

[0036] In a specific embodiment of the present application, the angle of the first angle α is equal to the angle of the second angle β. Through the above arrangement, the flow rate of the slurry passing through the first hole group is equal to the flow rate of the slurry passing through the second hole group, so as to ensure that when the slurry flows through the grinding disc and circulates, the pressure of the slurry on both sides of the grinding disc on the grinding disc is balanced, so as to ensure that the axial force of the grinding disc is equal and prevent the grinding disc from abnormal vibration.

[0037] In a specific embodiment of the present application, the flow area of ​​the first hole group is equal to the flow area of ​​the second hole group. When the flow rates of the slurry passing through the first hole group and the second hole group do not match, when the slurry circulates between the first hole group and the second hole group, the maximum flow rate of the circulation is the smaller one of the flow rate of the first hole group and the flow rate of the second hole group, and the difference between the flow rate of the first hole group and the flow rate of the second hole group will not participate in the circulation, which will waste the area of ​​the grinding structure on the surface of the grinding disc and affect the grinding effect of the grinding disc. The flow rate of the slurry passing through the first hole group is equal to the flow rate of the slurry passing through the second hole group, so as to ensure that the flow rates of the slurry passing through the first hole group and the second hole group match, thereby improving the grinding efficiency and grinding effect of the grinding disc.

[0038] Specifically, the flow area of ​​the first leakage hole 20 is greater than the flow area of ​​the second leakage hole 30, and the number of the first leakage holes 20 is less than the number of the second leakage holes 30. The first leakage hole 20 is located in the inner circle of the second leakage hole 30. Since the radial width of the outer circle area is narrow, the opening area of ​​the second leakage hole 30 is limited. In the present application, by setting the flow area of ​​the first leakage hole 20 to be greater than the flow area of ​​the second leakage hole 30, and setting the number of the first leakage holes 20 to be less than the number of the second leakage holes 30, the areas of the first hole group and the second hole group can be balanced, so as to balance the flow of the slurry convected through the first hole group and the second hole group, and ensure the grinding efficiency of the grinding disc.

[0039] In the present application, the outer periphery of the first hole group forms a separation ring 01, the first hole group and the second hole group are arranged on both sides of the separation ring 01, and the grinding disc is divided into a first part and a second part by the separation ring 01, the first part is located on the inner side of the separation ring 01, and the second part is located on the outer side of the separation ring 01, and the weight of the first part is equal to the weight of the second part. Through the above arrangement, the overall structural strength of the grinding disc can be guaranteed, and the grinding disc can be guaranteed not to vibrate when subjected to the pressure of the bidirectional slurry, so as to improve the stability of the rotation of the grinding disc and ensure the grinding effect of the grinding disc.

[0040] In a specific embodiment of the present application, the grinding disc also includes a plurality of third leakage holes 40, the extension direction of the axis of the third leakage hole 40 is the same as the extension direction of the axis of the grinding disc, and the third leakage hole 40 is arranged between two adjacent first leakage holes 20. By setting the third leakage holes 40, the slurry flow of the grinding disc can be adjusted, and the flow of the first hole group and the second hole group can be balanced. The specific number of the third leakage holes 40 can be set according to the use requirements of the fine grinder, as long as the third leakage holes 40 and the first leakage holes 20 are arranged at intervals to ensure that the slurry pressure on the surface of the grinding disc in the axial direction is the same.

[0041] Optionally, in other feasible embodiments of the present application, a plurality of third leakage holes 40 may also be disposed between two adjacent second leakage holes 30 .

[0042] Optionally, in some other embodiments of the present application, referring to Figure 5 As shown, both the first hole group and the second hole group are provided with the third leakage hole 40 , that is, the third leakage hole 40 is simultaneously provided between two adjacent first leakage holes 20 and between two adjacent second leakage holes 30 .

[0043] Furthermore, along the radial direction of the grinding disc, each first leakage hole 20 is correspondingly provided with at least one second leakage hole 30. Since the first hole group and the second hole group have opposite diversion directions for the slurry fluid, the slurry can flow between the first leakage hole 20 and the second leakage hole 30. When the grinding disc rotates at a high speed, the first leakage hole 20 will circulate the slurry with the nearby second leakage hole 30. Through the above arrangement, the flow path of the slurry can be shortened, and the circulation rate of the slurry can be further improved.

[0044] In the optimal embodiment of the present application, the first leakage holes 20 in the first hole group and the second leakage holes 30 in the second hole group can be set to an odd number, such as 3, 5, 7 or 9, so as to reduce the resonance of the grinding disk caused by the symmetry when the first leakage holes 20 or the second leakage holes 30 are set to an even number, reduce the noise of the grinding work, and ensure the stable rotation of the grinding disk.

[0045] Specifically in the present application, the first leakage hole 20 and the second leakage hole 30 can be circular holes to facilitate the processing of the grinding disc.

[0046] Specifically in the present application, the projection shape of the first leakage hole 20 on the plane orthogonal to the axis of the grinding disc can have a tapered section, that is, in the tapered section, the width of the first leakage hole 20 gradually decreases in the axial direction away from the grinding disc. In this way, when the material flows through the first leakage hole 20, the centrifugal degree of the material can be increased, so that the material can move farther in the radial direction, increase the distance the material is ground, and thus the material can be ground more fully.

[0047] Similarly, the projection shape of the second leakage hole 30 on the plane orthogonal to the axis of the grinding disc can also have a tapered section, and the tapered section of the second leakage hole 30 is arranged in the opposite direction to the tapered section of the first leakage hole 20, that is, the width of the second leakage hole 30 gradually increases in the axial direction away from the grinding disc. Such an arrangement can increase the efficiency of the slurry circulation between the first hole group and the second hole group, thereby improving the grinding efficiency of the grinding disc.

[0048] like Figure 6As shown, according to an embodiment of the present application, a fine grinder is also provided, the grinder comprises a housing 100 and a grinding assembly. The grinding assembly comprises a driving member, a transmission shaft 200 and a plurality of grinding discs, the grinding discs are the above-mentioned grinding discs, the transmission shaft 200 and the grinding discs are both arranged in the housing 100, the plurality of grinding discs are sleeved on the transmission shaft 200 through the shaft hole 10, the plurality of grinding discs are arranged at intervals along the axial direction of the transmission shaft 200, one end of the transmission shaft 200 extends out of the housing 100 and is drivingly connected to the driving member.

[0049] Specifically, when the driving member drives the transmission shaft 200 to rotate, multiple grinding discs can be driven by the transmission shaft 200 to rotate. By applying the above-mentioned grinding discs to the fine grinder provided in the present application, the slurry can circulate around the grinding discs, thereby further improving the grinding efficiency of the fine grinder, making the slurry more fully ground and having a better use effect.

[0050] Specifically, the number of grinding discs can be selected according to the capacity and grinding efficiency of the fine grinder, such as 6 or more.

[0051] Furthermore, the spacing between each grinding disc is equal, and two adjacent grinding discs are symmetrically arranged along a plane perpendicular to the axis of the transmission shaft 200. This allows the grinding medium between the two adjacent grinding discs to generate convection, for example, the slurry can flow out from the first leakage hole 20, and flow along the radial direction of the grinding disc before flowing out from the second leakage hole 30; or, the slurry can flow out from the second leakage hole 30, and flow along the radial direction of the grinding disc before flowing out from the first leakage hole 20. In this arrangement, the slurry between the adjacent grinding discs will generate a local convection phenomenon, so as to further improve the grinding efficiency of the grinding discs.

[0052] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0053] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0054] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0055] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0056] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A grinding disc, characterized in that: The grinding disc comprises: An axial hole (10), the axis of the axial hole (10) coincides with the axis of the grinding disc; A first hole group, the first hole group comprising a plurality of first leakage holes (20), the plurality of first leakage holes (20) being arranged at annular intervals on the outer periphery of the shaft hole (10), and an angle being formed between the axis of the first leakage holes (20) and the axis of the grinding disc; A second hole group, the second hole group comprises a plurality of second leakage holes (30), the plurality of second leakage holes (30) are arranged at intervals on the periphery of the first hole group in an annular manner, and an angle is formed between the axis of the second leakage hole (30) and the axis of the grinding disc; The flow direction of the slurry when flowing through the first hole group is opposite to the flow direction when flowing through the second hole group.

2. The grinding disc according to claim 1, characterized in that There is a first angle α between the axis of the first leakage hole (20) and the axis of the grinding disk, and the angle of the first angle α is between 5° and 25°. There is a second angle β between the axis of the second leakage hole (30) and the axis of the grinding disk, and the angle of the second angle β is between 5° and 25°.

3. The grinding disc according to claim 1, characterized in that The flow area of ​​the first hole group is equal to the flow area of ​​the second hole group.

4. The grinding disc according to claim 1, characterized in that The flow area of ​​the first leakage hole (20) is greater than the flow area of ​​the second leakage hole (30), and the number of the first leakage holes (20) is less than the number of the second leakage holes (30).

5. The grinding disc according to claim 1, characterized in that The outer periphery of the first hole group forms a separation ring (01), the first hole group and the second hole group are arranged opposite to each other on both sides of the separation ring (01), the grinding disc is divided into a first part and a second part by the separation ring (01), the first part is located on the inner side of the separation ring (01), the second part is located on the outer side of the separation ring (01), and the weight of the first part is equal to the weight of the second part.

6. The grinding disc according to claim 1, characterized in that The first angle α is equal to the second angle β.

7. The grinding disc according to claim 1, characterized in that The grinding disc further comprises a plurality of third leakage holes (40), wherein the axis of the third leakage holes (40) extends in the same direction as the axis of the grinding disc, and the third leakage holes (40) are arranged between two adjacent first leakage holes (20) and / or between two adjacent second leakage holes (30).

8. The grinding disc according to claim 7, characterized in that Along the radial direction of the grinding disc, each of the first leakage holes (20) is correspondingly provided with at least one of the second leakage holes (30).

9. A fine grinding machine, characterized in that: The grinding machine comprises: Housing (100); A grinding assembly, the grinding assembly comprising a driving member, a transmission shaft (200) and a plurality of grinding discs, the grinding discs being the grinding discs described in any one of claims 1 to 8, the transmission shaft (200) and the grinding discs being both disposed in the housing (100), the plurality of grinding discs being both sleeved on the transmission shaft (200) through an axial hole (10), the plurality of grinding discs being spaced apart along the axial direction of the transmission shaft (200), one end of the transmission shaft (200) extending out of the housing (100) and being drivingly connected to the driving member.

10. The fine grinding machine according to claim 9, characterized in that The spacing between each of the grinding discs is equal, and two adjacent grinding discs are symmetrically arranged along a plane perpendicular to the axis of the transmission shaft (200).

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