CN114768944A - Grinding disc and grinding machine with same - Google Patents

Abstract

The invention provides a grinding disc and a grinding machine with the same, wherein the grinding disc is provided with an installation through hole and a material leakage through hole, and the central line of the installation through hole is superposed with the central line of the grinding disc; the material leaking through hole is formed in the periphery of the mounting through hole, the inner wall of the material leaking through hole is provided with a first side face and a second side face which are oppositely arranged along the circumferential direction, and the distance between the first side face and the second side face is gradually increased towards the circumferential direction from the center of the grinding disc. Adopt this technical scheme to solve the not enough problem of abrasive disc grinding among the prior art.

Description

Grinding disc and grinding machine with same

Technical Field

The invention relates to the technical field of grinding, in particular to a grinding disc and a grinding machine with the same.

Background

The existing grinding machine comprises a plurality of grinding discs which are coaxially arranged at intervals, through holes are formed in the grinding discs, the grinding discs rotate when the grinding machine works, materials to be ground fall into the space between the two grinding discs from the through holes, centrifugal motion is carried out between the two grinding discs, and the materials are ground by means of mutual friction between the two grinding discs and the materials to be ground. However, the existing grinding machine has a small centrifugal amplitude of materials during grinding, so that the contact time between the materials and a grinding disc is short, the materials are not sufficiently ground, and the expected effect cannot be achieved.

Disclosure of Invention

The invention provides a grinding disc and a grinding machine with the same, and aims to solve the problem that the grinding disc in the prior art is not fully ground.

According to one aspect of the invention, the grinding disc is provided with a mounting through hole and a material leakage through hole, and the central line of the mounting through hole is coincident with the central line of the grinding disc; the material leaking through hole is formed in the periphery of the installation through hole, a first side face and a second side face which are arranged oppositely are arranged on the inner wall of the material leaking through hole along the circumferential direction, and the distance between the first side face and the second side face is gradually increased from the center of the grinding disc to the circumferential direction.

Furthermore, the inner wall of the material leakage through hole is also provided with a connecting cambered surface, the connecting cambered surface is positioned between the first side surface and the second side surface, and the connecting cambered surface is connected with the first side surface and the second side surface.

Furthermore, the connecting cambered surface comprises a first cambered surface and a second cambered surface, the first cambered surface is arranged on one side, close to the center of the grinding disc, of the first side face and the second side face, the second cambered surface is arranged on one side, far away from the center of the grinding disc, of the first side face and the second side face, the first cambered surface is tangent to the first side face and the second side face, and the second cambered surface is tangent to the first side face and the second side face.

Furthermore, it has a plurality ofly to leak the material through-hole, and a plurality of hourglass material through-hole ring array arrange in the periphery of installation through-hole.

Furthermore, the grinding disc is provided with an upper surface and a lower surface which are oppositely arranged, a surface which passes through the intersection line of the first side surface and the upper surface of the grinding disc and is parallel to the axis of the grinding disc is a first reference surface, and an included angle is formed between the first reference surface and the first side surface; the surface which passes through the intersection line of the second side surface and the upper surface of the grinding disc and is parallel to the axis of the grinding disc is a second reference surface, and an included angle is formed between the second reference surface and the second side surface.

Furthermore, the included angle between the first reference surface and the first side surface is alpha, and the included angle is more than or equal to 50 degrees and more than or equal to 30 degrees; the included angle between the second reference surface and the second side surface is beta, and the beta is more than or equal to 50 degrees and more than or equal to 30 degrees.

Furthermore, the first side surface and the second side surface are symmetrically arranged relative to the center plane of the material leaking through hole along the axis direction, and an included angle gamma is formed between the first side surface and the second side surface, wherein gamma is more than or equal to 0 degree and less than or equal to 30 degrees.

Furthermore, the second cambered surface is an arc surface, the shortest distance between the second cambered surface and the periphery of the grinding disc is L1, the diameter of the grinding disc is R1, and the ratio of 0.25 to L1/R1 is more than or equal to 0.1.

Furthermore, the first cambered surface is an arc surface, the shortest distance between the first cambered surface and the inner wall of the mounting through hole is L2, the diameter of the grinding disc is R1, and the ratio of 0.25 to L2/R1 to 0.15 is not less than.

Furthermore, the diameter of the first cambered surface is R3, the diameter of the second cambered surface is R2, and 0.6 is not less than R3/R2 is not less than 0.4.

Furthermore, the thickness of the grinding disc is L3, the diameter of the grinding disc is R1, and L3/R1 is more than or equal to 0.2 and less than or equal to 0.3.

According to another aspect of the present invention, there is provided a grinding machine, which includes a plurality of grinding drums, a connecting shaft and the above-described grinding discs, the plurality of grinding discs are arranged in the grinding drum at intervals, and the connecting shaft is inserted into the mounting through holes of the plurality of grinding discs.

By applying the technical scheme of the invention, the grinding disc is provided with the mounting through hole and the material leaking through hole, the material leaking through hole is arranged on the periphery of the mounting through hole, and the distance between the first side surface and the second side surface of the material leaking through hole is gradually increased from the center of the grinding disc to the periphery. Adopt above-mentioned structure, when the commodity circulation leaks the material through-hole, the interact power between first side and/or second side and the material can make the material flow towards the periphery of abrasive disc, makes the centrifugal degree of material in the grinder bigger like this to the distance of granule in the material with the abrasive disc contact has been increaseed, and then makes the granule more finely ground, has improved grinding efficiency. In addition, adopt above-mentioned structure, the simple structure of abrasive disc, convenient processing, raw materials cost and low in manufacturing cost.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic structural view of an abrasive disc provided according to an embodiment of the present invention;

FIG. 2 shows a partial cross-sectional view in the direction A-A of FIG. 1;

fig. 3 shows a cross-sectional view of an abrasive disc provided in accordance with an embodiment of the present invention.

Wherein the figures include the following reference numerals:

10. a grinding disk; 11. mounting a through hole; 12. a material leaking through hole; 13. an upper surface of the abrasive disk; 121. a first side surface; 122. a second side surface; 123. connecting the cambered surface; 1231. a first arc surface; 1232. a second cambered surface.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.

As shown in fig. 1 and 3, an embodiment of the present invention provides an abrasive disk, the abrasive disk 10 has a mounting through hole 11 and a leakage through hole 12, a center line of the mounting through hole 11 coincides with a center line of the abrasive disk 10; the material leaking through hole 12 is arranged at the periphery of the mounting through hole 11, the inner wall of the material leaking through hole 12 is provided with a first side surface 121 and a second side surface 122 which are oppositely arranged along the circumferential direction, and the distance between the first side surface 121 and the second side surface 122 is gradually increased from the center of the grinding disc 10 to the peripheral direction. The mounting through-hole 11 is used for connection with a connecting shaft of a grinding mill. During grinding in the mill, the material flows along the feed-through 12 towards the end of the mill. The distance between the first side surface 121 and the second side surface 122 gradually increases, and specifically, the first side surface 121 and/or the second side surface 122 may be designed as an inclined surface or an arc surface. Through the above structure, when the material flows through the material leakage through hole 12, the impact force applied to the material by the first side surface 121 and the second side surface 122 has a decomposition force toward the edge direction of the grinding disc 10, so that the centrifugal degree of the material can be increased, the material can move farther in the radial direction, and the distance of the material to be ground is increased, so that the material can be ground more sufficiently.

By applying the technical scheme of the invention, the grinding disc 10 comprises the mounting through hole 11 and the material leakage through hole 12, the material leakage through hole 12 is arranged at the periphery of the mounting through hole 11, and the distance between the first side surface 121 and the second side surface 122 of the material leakage through hole 12 is gradually increased from the center of the grinding disc 10 to the peripheral direction. With the above structure, when the material flows through the material leakage through hole 12, the interaction force between the first side surface 121 and/or the second side surface 122 and the material makes the material flow toward the periphery of the grinding disc 10, so that the centrifugal degree of the material in the grinding machine is larger, the contact distance between the particles in the material and the grinding disc 10 is increased, the particles are finer to be ground, and the grinding efficiency is improved. In addition, adopt above-mentioned structure, the simple structure of abrasive disc, convenient processing, raw materials cost and low in manufacturing cost.

In this embodiment, the inner wall of the skip through hole 12 further has a connection arc surface 123, the connection arc surface 123 is located between the first side surface 121 and the second side surface 122, and the connection arc surface 123 connects the first side surface 121 and the second side surface 122. The connection arc surface 123 is arranged to smooth the inside of the material leakage through hole 12, so that the resistance of the material flowing through the material leakage through hole 12 is small, and the material can be kept at a high grinding speed. In addition, the first side surface 121 and the second side surface 122 are connected by the connecting cambered surface 123, so that the processing of the leaking through hole 12 is facilitated.

Specifically, the connecting arcs 123 include a first arc 1231 and a second arc 1232, the first arc 1231 is disposed on one side of the first side 121 and the second side 122 close to the center of the abrasive disk 10, and the second arc 1232 is disposed on one side of the first side 121 and the second side 122 away from the center of the abrasive disk 10. With this arrangement, the distance between the first side surface 121 and the second side surface 122 can be increased, so that the cross-sectional area of the leakage through hole 12 is increased, and thus the material can smoothly flow from the leakage through hole 12 to the end of the grinder, and the material is prevented from stagnating between the grinding disks 10.

In this embodiment, the first cambered surface 1231 is tangent to both the first side surface 121 and the second side surface 122, and the second cambered surface 1232 is tangent to both the first side surface 121 and the second side surface 122, so as to smooth the inner wall of the leaking through hole 12, thereby reducing the flow resistance of the material when the material flows in the leaking through hole 12, and further increasing the overall grinding speed of the grinder.

In this embodiment, the plurality of material leaking through holes 12 are arranged in an annular array around the mounting through hole 11. Adopt above-mentioned structure, can make hourglass material through-hole 12 exert even power towards abrasive disc 10 periphery to the material to make the material evenly flow to abrasive disc 10's periphery, and then make the whole centrifugal degree of material increase, further strengthened the grinding effect of material like this. Alternatively, the number of the skip through holes 12 may be 4, 6, 8 or 10.

As shown in fig. 2, the polishing disc 10 has an upper surface and a lower surface which are oppositely arranged, a plane passing through an intersection line of the first side surface 121 and the upper surface 13 of the polishing disc and parallel to the axis of the polishing disc 10 is a first reference plane, and an included angle is formed between the first reference plane and the first side surface 121; the plane passing through the intersection line of the second side surface 122 and the upper surface 13 of the polishing disc and parallel to the axis of the polishing disc 10 is a second reference plane, and an included angle is formed between the second reference plane and the second side surface 122. The first reference surface and the first side surface 121 form an included angle therebetween, so that the impact force of the first side surface 121 on the material has a resolving force in a direction towards the lower surface of the grinding disc, so that the material can flow rapidly towards the lower surface of the grinding disc. Because be provided with a plurality of abrasive discs along axial interval in the grinder, the material flows to the lower surface of abrasive disc from the upper surface of every abrasive disc in proper order, consequently, adopts above-mentioned structure can make the material flow to the lower surface of abrasive disc from the upper surface of every abrasive disc fast, and then has accelerated the grinding speed of grinder. Thereby increasing the overall grinding speed of the grinder. Similarly, an included angle is formed between the first and second side surfaces 122 of the second reference surface, so that the impact force of the second side surface 122 on the material has a resolving force towards the lower surface of the grinding disc, so that the material can flow towards the lower surface of the grinding disc quickly, and the grinding speed of the grinder can be increased.

Specifically, the included angle between the first reference surface and the first side surface 121 is α, and 50 ° or more α or more is 30 ° or more; the included angle between the second reference surface and the second side surface 122 is beta, and beta is more than or equal to 50 degrees and more than or equal to 30 degrees. If alpha is less than 30 degrees, the resolving power of the impact force of the first reference surface to the material in the direction towards the lower surface of the grinding disc is smaller, so that the movement of the material towards the lower surface of the grinding disc cannot be accelerated well, and the overall grinding speed cannot be accelerated well; if the angle alpha is larger than 50 degrees, the decomposing force of the impact force of the first side surface 121 to the material towards the direction vertical to the axis is smaller, so that the decomposing force of the impact force of the first side surface 121 to the material towards the peripheral direction of the grinding disc is smaller, and further the centrifugal degree of the material is smaller; therefore, alpha is set to be more than or equal to 30 degrees at an angle of 50 degrees or more, the grinding speed can be higher, and the centrifugal degree of the materials can be higher. Similarly, the angle beta is set to be more than or equal to 50 degrees and more than or equal to 30 degrees, so that the grinding speed is high, and the centrifugal degree of the material is high. Specifically, α may be 30 °, 35 °, 40 °, 45 °, or 50 °, β may be 30 °, 35 °, 40 °, 45 °, or 50 °.

As shown in fig. 1 and fig. 2, in the present embodiment, the first side surface 121 and the second side surface 122 are symmetrically arranged with respect to a central plane of the skip through hole 12 along the axial direction, specifically, as shown in fig. 2, an axis of the skip through hole 12 is at O in fig. 2, and the first side surface 121 and the second side surface 122 are symmetrically arranged along the axis. An included angle γ is formed between the first side surface 121 and the second side surface 122, γ is greater than or equal to 0 ° and less than or equal to 30 °, an included angle between the first side surface 121 and the second side surface 122 in the radial direction of the abrasive disk 10 is defined herein, that is, a line perpendicular to the line of intersection on the first side surface 121 is a first line, a line perpendicular to the line of intersection on the second side surface 122 is a second line, and an included angle between the first line and the second line is γ. The first side surface 121 and the second side surface 122 are symmetrically arranged relative to the central plane of the material leakage through hole 12 along the axial direction, so that the impact force of the first side surface 121 and the impact force of the second side surface 122 to the material are the same, the impact directions are symmetrical, the stress of the material is uniform, and the material centrifugation degree is larger. If gamma is larger than 30 degrees, the cross sectional area of the material leakage through hole 12 is larger, so that the cross sectional areas of the upper surface 13 and the lower surface of the grinding disc are smaller, the contact area of the grinding disc 10 and the material is smaller, the grinding effect of the material is poorer, and the structure can also reduce the structural strength of the grinding disc 10; therefore, gamma is set to be more than or equal to 0 degree and less than or equal to 30 degrees, the contact area of the grinding disc 10 and materials can be larger, the grinding effect is ensured, and the structural strength of the grinding disc 10 can be increased.

Specifically, the second arc surface 1232 is a circular arc surface, the shortest distance between the second arc surface 1232 and the periphery of the grinding disc 10 is L1, the diameter of the grinding disc 10 is R1, and 0.25 is greater than or equal to L1/R1 is greater than or equal to 0.1. If the L1/R1 is less than 0.1, the second cambered surface 1232 is closer to the periphery of the grinding disc, so that the material leakage through hole 12 is arranged close to the periphery of the grinding disc 10, the minimum thickness between the inner wall of the material leakage through hole 12 and the periphery of the grinding disc 10 is smaller, the structural strength of the part is reduced, and the service life of the grinding disc 10 is further reduced; if the L1/R1 is more than 0.25, the material leaking through hole 12 is close to the center of the grinding disc 10, so that the minimum thickness between the inner wall of the material leaking through hole 12 and the inner wall of the mounting through hole 11 is smaller, the structural strength of the position is reduced, and the service life of the grinding disc 10 is further shortened; therefore, the minimum thickness between the inner wall of the material leakage through hole 12 and the periphery of the grinding disc 10 is larger, the minimum thickness between the inner wall of the material leakage through hole 12 and the inner wall of the mounting through hole 11 is larger, and the service life of the grinding disc 10 can be prolonged by setting the L1/R1 to be larger than or equal to 0.1. Specifically, L1/R1 is 0.1, 0.15, 0.18, 0.20, 0.23, or 0.25.

Specifically, the first arc surface 1231 is a circular arc surface, the shortest distance between the first arc surface 1231 and the inner wall of the installation through hole 11 is L2, the diameter of the grinding disc 10 is R1, and 0.25 is greater than or equal to L2/R1 is greater than or equal to 0.15. If the L2/R1 is less than 0.15, the first cambered surface 1231 is close to the mounting through hole 11, namely the material leaking through hole 12 is close to the center of the grinding disc 10, so that the minimum thickness between the inner wall of the material leaking through hole 12 and the inner wall of the mounting through hole 11 is smaller, the structural strength of the part is reduced, and the service life of the grinding disc 10 is further reduced; if L2/R1 is more than 0.25, the material leakage through hole 12 is far away from the center of the grinding disc 10, namely the material leakage through hole 12 is close to the edge of the grinding disc 10, so that the minimum thickness between the inner wall of the material leakage through hole 12 and the periphery of the grinding disc 10 is smaller, the structural strength of the position is reduced, and the service life of the grinding disc 10 is further reduced; therefore, the minimum thickness between the inner wall of the material leakage through hole 12 and the periphery of the grinding disc 10 is larger, the minimum thickness between the inner wall of the material leakage through hole 12 and the inner wall of the mounting through hole 11 is larger, and the service life of the grinding disc 10 can be prolonged by setting the L2/R1 to be larger than or equal to 0.15. Specifically, L2/R1 is 0.15, 0.2, or 0.25.

Specifically, the diameter of the first cambered surface 1231 is R3, the diameter of the second cambered surface 1232 is R2, and 0.6 is greater than or equal to R3/R2 is greater than or equal to 0.4. Because the first cambered surface 1231 is tangent to both the first side surface 121 and the second side surface 122, and the second cambered surface 1232 is tangent to both the first side surface 121 and the second side surface 122, if R3/R2 is less than 0.4, the diameter difference between the first cambered surface 1231 and the second cambered surface 1232 is large, so that the included angle γ between the first side surface 121 and the second side surface 122 is large, the cross-sectional area of the material leakage through hole 12 is large, the cross-sectional areas of the upper surface 13 of the grinding disc and the lower surface of the grinding disc are reduced, the area of the grinding disc 10 for contacting with the material is reduced, the grinding effect is poor, and the strength of the grinding disc 10 can be reduced due to the structure; if R3/R2 is greater than 0.6, the difference between the diameters of the first cambered surface 1231 and the second cambered surface 1232 is small, so that the included angle γ between the first side surface 121 and the second side surface 122 is small, the resolving power of the impact force of the first side surface 121 and the second side surface 122 on the material towards the peripheral direction of the grinding disc is small, and the material centrifugation degree is small; therefore, the arrangement of 0.6 to 0.6 is not less than R3/R2 to 0.4, so that the grinding disc 10 has a larger contact area with the materials and can ensure that the materials have a larger centrifugal degree, thereby improving the grinding effect. Specifically, R3/R2 is 0.4, 0.5, or 0.6.

Specifically, the thickness of the grinding disc 10 is L3, the diameter of the grinding disc 10 is R1, and L3/R1 is more than or equal to 0.2 and less than or equal to 0.3. If L3/R1 is less than 0.2, the diameter of the polishing disc 10 is large and the thickness is thin, so that the structural strength of the polishing disc 10 is low, and the service life of the polishing disc 10 is short; if L3/R1 > 0.3, the diameter of the grinding disc is small and the thickness is thick, which makes the overall axial length of the grinder long, thus making the grinder occupy a large space and wasting raw materials of the grinding disc 10; therefore, setting 0.2L 3/R1 0.3 makes it possible to increase the life of the grinding pan 10 and to reduce the overall length of the grinding machine. Specifically, L3/R1 is 0.2, 0.25, or 0.3.

In practical work, the structural size of the leakage through hole 12 can be designed according to 0.25-L1/R1-0.1, 0.25-L2/R1-0.15, 0.6-R3/R2-0.4 and 0 degree-gamma-30 degrees, and the position of the leakage through hole 12 can be designed according to 0.25-L1/R1-0.1 and 0.25-L2/R1-0.15.

The invention also provides a grinder which comprises a grinding cylinder, a connecting shaft and the grinding discs 10, wherein the grinding discs 10 are multiple, the grinding discs 10 are arranged in the grinding cylinder at intervals, and the connecting shaft is arranged in the mounting through holes 11 of the grinding discs 10 in a penetrating manner. The material flows through each grinding disc 10 from one end of the mill and the upper surface 13 of the grinding disc and the lower surface of the grinding disc rub against the material, whereby the particles in the material are ground. With the above-described grinding disk 10, the grinding effect of the grinding machine can be made better, and the grinding speed of the grinding machine can be made faster.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it is to be understood that the directions or positional relationships indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the directions or positional relationships shown in the drawings, and are for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …", "above … …", "above … …", "above", and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (12)

1. The grinding disc is characterized in that the grinding disc (10) is provided with a mounting through hole (11) and a material leakage through hole (12), and the central line of the mounting through hole (11) is superposed with the central line of the grinding disc (10); the material leaking through hole (12) is formed in the periphery of the mounting through hole (11), a first side face (121) and a second side face (122) which are arranged oppositely are arranged on the inner wall of the material leaking through hole (12) along the circumferential direction, and the distance between the first side face (121) and the second side face (122) is gradually increased from the center of the grinding disc (10) to the circumferential direction.

2. The grinding disc according to claim 1, characterized in that the inner wall of the leakage through hole (12) further has a connecting arc surface (123), the connecting arc surface (123) is located between the first side surface (121) and the second side surface (122), and the connecting arc surface (123) connects the first side surface (121) and the second side surface (122).

3. An abrasive disc according to claim 2, characterized in that said connecting arcs (123) comprise a first arc (1231) and a second arc (1232), said first arc (1231) being arranged on the side of said first side (121) and said second side (122) close to the center of the abrasive disc (10), said second arc (1232) being arranged on the side of said first side (121) and said second side (122) remote from the center of the abrasive disc (10), said first arc (1231) being tangent to both said first side (121) and said second side (122), said second arc (1232) being tangent to both said first side (121) and said second side (122).

4. The grinding disc according to claim 1, characterized in that the leakage through hole (12) has a plurality, and the plurality of leakage through holes (12) are arranged in an annular array at the periphery of the mounting through hole (11).

5. The grinding disc according to claim 1, characterized in that the grinding disc (10) has an upper surface and a lower surface which are oppositely arranged, the first side surface (121) and the second side surface (122) are inclined surfaces, a surface which passes through an intersection line of the first side surface (121) and the upper surface (13) of the grinding disc and is parallel to the axis of the grinding disc (10) is a first reference surface, and an included angle is formed between the first reference surface and the first side surface (121); and a plane passing through the intersection line of the second side surface (122) and the upper surface (13) of the grinding disc and parallel to the axis of the grinding disc (10) is a second reference surface, and an included angle is formed between the second reference surface and the second side surface (122).

6. A grinding disc according to claim 5, characterized in that the angle between the first reference surface and the first side surface (121) is α, 50 ° ≧ α ≧ 30 °; the included angle between the second reference surface and the second side surface (122) is beta, and the included angle is more than or equal to 50 degrees and more than or equal to 30 degrees.

7. An abrasive disc according to claim 1, characterized in that said first side surface (121) and said second side surface (122) are arranged symmetrically with respect to the center plane of the through-feed holes (12) in the axial direction, and that said first side surface (121) and said second side surface (122) have an angle γ of 0 ° ≦ γ ≦ 30 °.

8. The grinding disc according to claim 3, characterized in that the second cambered surface (1232) is a circular arc surface, the shortest distance between the second cambered surface (1232) and the periphery of the grinding disc (10) is L1, the diameter of the grinding disc (10) is R1, and 0.25 ≧ L1/R1 ≥ 0.1.

9. The grinding disc as claimed in claim 3, wherein the first cambered surface (1231) is a circular arc surface, the shortest distance between the first cambered surface (1231) and the inner wall of the mounting through hole (11) is L2, the diameter of the grinding disc (10) is R1, and 0.25 is L2/R1 is 0.15.

10. A grinding disc according to claim 3, characterized in that the diameter of the first cambered surface (1231) is R3 and the diameter of the second cambered surface (1232) is R2, 0.6 ≧ R3/R2 ≥ 0.4.

11. The grinding disc according to claim 1, characterized in that the thickness of the grinding disc (10) is L3, the diameter of the grinding disc (10) is R1, 0.2 ≦ L3/R1 ≦ 0.3.

12. A grinding machine, characterized in that it comprises a grinding cylinder, a connecting shaft and a grinding disc (10) as claimed in any one of claims 1 to 11, said grinding disc (10) being in plurality, a plurality of said grinding discs (10) being arranged at intervals in said grinding cylinder, said connecting shaft being inserted in mounting through holes (11) of a plurality of said grinding discs (10).

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