Grinding cutter head, grinding device and beverage brewing equipment

Abstract

The utility model discloses a grinding cutterhead, grinding device and beverage brewing equipment, the grinding cutterhead comprises a base and a grinding tooth group, the grinding tooth group comprises a plurality of outer blade parts which are distributed at intervals along the circumferential direction, a concave part is formed between every two adjacent outer blade parts, and the outer blade parts are arranged on the base. The concave part is provided with a first concave face adjacent to the front side of the outer blade part in the rotating direction and a second concave face located in front of the first concave face, and the first concave face and the second concave face are arranged at an included angle and connected through an inner chamfer structure. According to the utility model, the first concave surface and the second concave surface are connected through the inner chamfer structure, so that the first concave surface and the second concave surface are in smooth transition connection and are prevented from intersecting to form a sharp internal corner, the minimum size of the internal corner of the discharging channel is increased, the proportion of superfine powder in coffee powder is reduced, and the flavor and taste of extracted coffee liquid are improved; meanwhile, the situation that coffee powder is deposited in the sharp internal corner can be reduced, the grinding efficiency is improved, the temperature rise in the grinding process is reduced, and the quality of coffee liquid is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of coffee utensils, and in particular to a grinding knife disc, a grinding device and beverage brewing equipment. Background Art

[0002] The grinding blade directly determines the quality of a cup of coffee. The tooth shape of the blade can affect the powder extraction efficiency and the particle size of the coffee powder. It is understandable that the proportion of ultra-fine powder (i.e. particles with a particle size of less than 330 microns) in the ground coffee powder should be minimized as much as possible. This is because in the coffee extraction process, ultra-fine powder is easily over-extracted, resulting in impurities, thus affecting the taste of the extracted coffee liquid.

[0003] However, in existing beverage preparation equipment, such as coffee machines and bean grinders, a sharp inner angle is often formed at the discharge edge of the grinding disc. This is because the outer edge of the grinding disc needs to further cut and crush the crushed coffee beans in the grinding gap during the discharge process to prepare sufficiently fine coffee powder. However, the existence of this inner angle, on the one hand, causes the local size of the discharge channel to be too small, resulting in an excessively high proportion of extremely fine powder in the coffee powder. On the other hand, it also causes the coffee powder to settle in the inner angle, further reducing the discharge channel, which not only has an adverse effect on the grinding efficiency, but also causes an increase in the temperature rise during the grinding process of the coffee powder, ultimately affecting the taste of the coffee liquid.

[0004] Especially in commercial coffee machines, the grinding device is a very important working unit of the commercial coffee machine. It is an important part of whether a commercial coffee machine can extract a cup of good-tasting coffee liquid, but it is often overlooked by R&D designers. Among them, the grinding blade in the grinding device is the core component for grinding coffee beans. Utility Model Content

[0005] Therefore, the utility model aims to provide a grinding blade, a grinding device and a beverage brewing device for reducing the proportion of ultra-fine powder in coffee powder and improving the taste of coffee liquid.

[0006] In order to solve the above technical problems, the utility model provides a grinding cutter disc, comprising:

[0007] A base is arranged in an annular shape, the base having a working side and a peripheral side, the working side is arranged to face the grinding gap, and the peripheral side is arranged around the periphery of the base; and,

[0008] a grinding tooth group formed on the working side, the grinding tooth group comprising a plurality of outer blades distributed at intervals along the circumferential direction on the working side, each of the outer blades extending from the outer circumferential side to the middle of the working side, a recessed portion formed between each two adjacent outer blades, each of the recessed portions at least partially recessed relative to the outer blades to have a first concave surface adjacent to the front side of the outer blades in the rotation direction, and a second concave surface located in front of the first concave surface, the outer blades forming a partial edge of the first concave surface;

[0009] Wherein, the first concave surface and the second concave surface are arranged at an angle and are connected via an inner chamfer structure.

[0010] Optionally, the inner chamfer structure includes a single chamfered surface.

[0011] Optionally, the chamfered surface is a plane or a curved surface, and an angle between the chamfered surface and the first concave surface is greater than 90 degrees, and an angle between the chamfered surface and the second concave surface is greater than 90 degrees.

[0012] Optionally, the chamfered surface is a curved surface, and the chamfered surface is tangent to at least one of the first concave surface and the second concave surface.

[0013] Optionally, the chamfered surface is tangent to the first concave surface and the second concave surface respectively.

[0014] Optionally, the radius R of the chamfered surface is greater than or equal to 0.05 mm and less than or equal to 0.15 mm.

[0015] Optionally, the inner chamfer structure includes a plurality of chamfered surfaces, and the plurality of chamfered surfaces intersect in sequence between the first concave surface and the second concave surface, and an angle between each two intersecting chamfered surfaces is greater than 90 degrees.

[0016] Optionally, each chamfered surface is a plane or a curved surface, and the angle between the chamfered surface intersecting with the first concave surface and the first concave surface is greater than 90 degrees, and the angle between the chamfered surface intersecting with the second concave surface and the second concave surface is greater than 90 degrees.

[0017] Optionally, each of the chamfered surfaces is a plane or an arc surface, and the chamfered surface adjacent to the first concave surface is an arc surface tangent to the first concave surface, and / or the chamfered surface adjacent to the second concave surface is an arc surface tangent to the second concave surface.

[0018] Optionally, the recessed portion passes through the outer peripheral side, and in a radial projection view of the grinding disc, the inner chamfer structure is located at the bottom of the recessed portion.

[0019] Optionally, in the radial projection view of the grinding cutter disc, the axial dimension H of the recessed portion is greater than or equal to 0.22 mm and less than or equal to 0.32 mm.

[0020] Optionally, the peripheral side includes a first peripheral side adjacent to the working side, and a second peripheral side adjacent to the end side of the first peripheral side away from the working side, the first peripheral side intersects with the working side and the second peripheral side respectively, and the angles between the first peripheral side and the working side, and between the second peripheral side and the second peripheral side are respectively greater than 90 degrees.

[0021] Optionally, an angle a between the first outer peripheral side and the axial direction is greater than or equal to 40 degrees and less than or equal to 50 degrees.

[0022] Optionally, the recessed portion passes through the first outer peripheral side.

[0023] Optionally, the grinding blade is integrally formed and made of ceramic.

[0024] In order to solve the above technical problems, the utility model provides a grinding device, comprising:

[0025] A first cutter disc and a second cutter disc, wherein the first cutter disc and the second cutter disc are coaxial and relatively rotatable, and working sides of the first cutter disc and the second cutter disc are axially opposite to each other to form a grinding gap between the first cutter disc and the second cutter disc;

[0026] Wherein, at least one of the first blade disc and the second blade disc is a grinding blade disc as described above.

[0027] In order to solve the above technical problems, the utility model provides a beverage mixing device, including the grinding device as described above.

[0028] The technical solution provided by the utility model has the following advantages:

[0029] The utility model provides a grinding blade, a grinding device and a beverage mixing device. The grinding blade comprises a base and a grinding tooth group, the base is arranged in an annular shape and has a working side and a peripheral side, the working side faces the grinding gap, the peripheral side is arranged in an annular shape on the outer periphery of the base, the grinding tooth group is formed on the working side, and comprises a plurality of outer blades distributed at intervals along the circumferential direction, a recessed portion is formed between each two adjacent outer blades, the recessed portion comprises a first concave surface adjacent to the front side of the outer blade in the rotation direction, and a second concave surface located in front of the first concave surface, the first concave surface and the second concave surface are arranged at an angle, and are connected by an inner chamfer structure.

[0030] In the embodiment provided by the utility model, the grinding blade utilizes an inner chamfer structure to connect the first concave surface and the second concave surface, so that the first concave surface and the second concave surface are connected smoothly, avoiding the direct intersection of the two to form a sharp inner angle, increasing the minimum size of the discharge channel at the inner angle, thereby reducing the proportion of extremely fine powder in the coffee powder and improving the flavor and taste of the extracted coffee liquid. At the same time, it can also reduce the deposition of coffee powder in the sharp inner angle, improve the grinding efficiency, and reduce the temperature rise of the coffee powder during the grinding process, further improving the quality of the coffee liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is a top view of a grinding cutter disc in the prior art;

[0033] Figure 2 for Figure 1 The enlarged schematic diagram of point A in the middle;

[0034] Figure 3 for Figure 2 Sectional view at AA in the middle;

[0035] Figure 4 A top view of an embodiment of a grinding cutter disc provided by the utility model;

[0036] Figure 5 for Figure 4 The enlarged schematic diagram of point B in the middle;

[0037] Figure 6 for Figure 5 Sectional view at the middle BB;

[0038] Figure 7 for Figure 6 A cross-sectional schematic diagram of another embodiment of the chamfer structure;

[0039] Figure 8 for Figure 6 A cross-sectional schematic diagram of another embodiment of the middle chamfer structure;

[0040] Fig. 9 for Figure 4 Schematic diagram of the three-dimensional structure of the grinding cutter disc;

[0041] Fig.10 for Fig. 9 Enlarged schematic diagram of point C in the middle

[0042] Fig.11 for Figure 4 Side view of the middle grinding disc;

[0043] Fig.12 for Fig.11 The enlarged schematic diagram of point D in the middle;

[0044] Fig.13 It is a partial cutaway schematic diagram of an embodiment of a grinding device provided by the utility model.

[0045] Description of reference numerals:

[0046] 100-grinding disc; 1-base; 11-working side; 12-peripheral side; 121-first peripheral side; 122-second peripheral side; 20-grinding tooth group; 21-outer blade portion; 30-recessed portion; 31-first concave surface; 32-second concave surface; 40-inner chamfer structure; 41-chamfered surface; 200-grinding gap; 201-first disc; 202-second disc. DETAILED DESCRIPTION

[0047] The technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all of the embodiments. The utility model will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. It should be noted that the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

[0048] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0049] The present invention provides a grinding blade 100, a grinding device having the grinding blade 100, and a beverage preparation device. The present invention does not limit the specific type of the beverage preparation device, and it can be any product that can extract and brew the powdered material obtained by grinding a granular material to finally obtain a beverage. Specifically, the beverage preparation device can be, but is not limited to, a coffee machine, a soybean milk machine, etc. For ease of understanding, the following embodiments are all described by taking the beverage preparation device as a coffee machine as an example.

[0050] The beverage preparation device provided by the present invention includes a grinding device. It should be noted that the grinding device provided by the present invention may be a part of the beverage preparation device to grind the raw materials during the beverage preparation process. In other embodiments, the grinding device may also be used as a separate product dedicated to grinding food raw materials, such as a bean grinder. Specifically, the grinding device may include but is not limited to a container (not shown in the figure) and a grinding assembly. A grinding chamber is formed in the container. The grinding assembly is disposed in the grinding chamber and can grind granular materials such as coffee beans in the accommodating chamber to generate a powdered finished product.

[0051] See also Fig.13 The grinding assembly may include but is not limited to a transmission mechanism and a first blade disc 201 and a second blade disc 202, wherein at least one of the first blade disc 201 and the second blade disc 202 is the grinding blade disc 100 provided by the present invention. Figure 1 The first cutter disc 201 and the second cutter disc 202 are coaxial and arranged side by side in the axial direction. The first cutter disc 201 and the second cutter disc 202 respectively have a working side 11 provided with a grinding tooth group 20. The working sides 11 of the two cutter discs are arranged opposite to each other in the axial direction, and a grinding gap 200 is formed between the two. The first cutter disc 201 and the second cutter disc 202 can be relatively rotatable, specifically, can be relatively rotatable around a rotating shaft extending in the axial direction. The first cutter disc 201 and the second cutter disc 202 are respectively formed with a feed channel that passes through the grinding cutter disc 100 in the axial direction. Fig.13 The dashed arrow line indicates the feeding path of the material in the grinding device. The granular material enters the grinding gap 200 from the feed channel, and is cut, crushed and other operations by the two grinding discs 100 to form a powdered material product, which is output from between the outer peripheries of the two grinding discs 100.

[0052] The shapes and structures of the first blade disc 201 and the second blade disc 202 may be completely the same or different. Fig.13 As shown, in one embodiment, the first blade disc 201 and the second blade disc 202 are both grinding blade discs 100 provided by the utility model. The relative rotation of the two grinding blade discs 100 can be achieved as follows: in one embodiment, one of the two grinding blade discs 100 is a stationary blade disc, and the other is a moving blade disc, and a transmission mechanism is connected to the moving blade disc in a transmission manner to drive the moving blade disc to rotate relative to the stationary blade disc. In another embodiment, the two grinding blade discs 100 can be rotatably mounted on the container respectively, and the transmission mechanism is connected to the two grinding blade discs 100 in a transmission manner to drive the two blade discs to rotate relative to each other. There is no limitation on the power source of the transmission mechanism, for example, it can be manually driven or electrically driven. It should be noted that, Figure 1The first blade disc 201 rotates clockwise relative to the second blade disc 202, and the second blade disc 202 rotates counterclockwise relative to the first blade disc 201. Of course, depending on the design of the structure of the second blade disc 202, the rotation directions of the two grinding blade discs 100 can also be reversed.

[0053] It should be noted that in the embodiments provided by the present invention, the description of directionality is only used for the orientation of the product when it is assembled and in normal use, and is not applicable to its orientation during production, transportation, and assembly. The axial direction is the extension direction of the rotation axis of the grinding cutter disc 100, and the circumferential and radial directions are perpendicular to the axial direction and correspond to the axial direction. The middle finger of the rotation direction is parallel to the circumferential direction, and during the rotation of the grinding cutter disc 100, the structure in front of the grinding cutter disc 100 in the circumferential direction reaches the same position before the structure in the rear.

[0054] See also Figures 4 to 12 The utility model provides a grinding cutter disc 100, comprising a base 1 and a grinding tooth group 20 arranged on the base 1, wherein the base 1 is arranged in an annular shape and has a working side 11 and a peripheral side 12, wherein the working side 11 is a side of the base 1 facing the grinding gap 200, and the peripheral side 12 is arranged in an annular shape around the periphery of the base 1, and the peripheral side 12 also surrounds the periphery of the working side 11.

[0055] The grinding teeth set 20 is formed on the working side 11, specifically, see Figure 4 , Fig. 9 and Fig.10 , the grinding tooth group 20 is formed by the concave-convex shape of the working side 11. Specifically, the grinding tooth group 20 includes a plurality of outer blades 21 distributed at intervals along the circumferential direction on the working side 11, and the outer blades 21 have a cutting edge extending approximately in the radial direction. Each of the outer blades 21 extends from the outer peripheral side 12 to the middle of the working side 11, and a recessed portion 30 is formed between each two adjacent outer blades 21. Each recessed portion 30 is at least partially recessed relative to the outer blade 21, so as to have a first concave surface 31 adjacent to the front side of the outer blade 21 in the rotation direction, and a second concave surface 32 located in front of the first concave surface 31, and the outer blade 21 constitutes a partial edge of the first concave surface 31. The first concave surface 31 and the second concave surface 32 are arranged at an angle. In this way, the recessed portion 30 can pass through to the outer peripheral side 12 of the base 1 to form a discharge channel, and the powdered material formed by grinding and rolling can be output from the discharge channel to the periphery of the grinding assembly. It can be understood that the shape and size of the discharge channel have a direct impact on the particle size distribution of the ground powdered material.

[0056] See also Figures 1 to 3In the grinding blade 100' provided in the prior art, the base 1 is also formed with outer blade portions 21' and recessed portions 30' arranged alternately in the circumferential direction, wherein the first concave surface 31' and the second concave surface 32' of the recessed portion 30' directly intersect, resulting in a sharp inner angle formed at the intersection of the two, such as Figure 2 and Figure 3 As shown, a cross section is made in the extension direction of the outer blade 21'. The angle of the inner corner is usually an acute angle, that is, the size of the discharge channel at the inner corner becomes very small, which easily leads to the production of ultra-fine powder (particles with a particle size of less than 330 microns), and the proportion of particles less than 200 microns in the ultra-fine powder is also relatively large. In this way, when extracting coffee powder, the ultra-fine powder is over-extracted, which easily leads to the appearance of foreign flavors in the coffee liquid. In addition, residual coffee powder is easily accumulated at the inner corner, resulting in reduced powder discharge efficiency and increased temperature rise, which further adversely affects the flavor of the coffee liquid.

[0057] To this end, in the embodiments provided in the present utility model, please refer to Figures 5 to 10 , the first concave surface 31 and the second concave surface 32 are connected by the inner chamfer structure 40 therebetween. In this embodiment, the inner chamfer structure 40 refers to a structure that is concave and makes the first concave surface 31 and the second concave surface 32 relatively smoother in transition connection. That is to say, the first concave surface 31 and the second concave surface 32 do not intersect directly, but are relatively smoother in transition by using the inner chamfer structure 40. In this way, the two are prevented from intersecting directly to form a sharp inner corner, and the minimum size of the discharge channel at the inner corner is increased, thereby reducing the proportion of ultra-fine powder in the coffee powder. According to experiments, this structure can reduce the proportion of ultra-fine powder in the coffee powder by more than 10% compared with the prior art, and further, it can also reduce the proportion of particles with a particle size of less than 200 microns in the ultra-fine powder, so as to effectively improve the situation where the ultra-fine powder is over-extracted, resulting in the appearance of impurities in the coffee liquid, and improve the flavor and taste of the extracted coffee liquid. At the same time, it can also reduce the situation where the coffee powder is deposited in the sharp inner corner, improve the grinding efficiency, and reduce the temperature rise of the coffee powder during the grinding process, further improving the quality of the coffee liquid.

[0058] The specific shape and size of the inner chamfer structure 40 can be designed according to actual needs. Figure 6 and Figure 7 , the inner chamfer structure 40 includes a single chamfered surface 41. That is, the first concave surface 31 is connected to the second concave surface 32 through a plane or a curved surface. In an optional embodiment, the single chamfered surface 41 intersects with the first concave surface 31 and the second concave surface 32 respectively, and the angle between the chamfered surface 41 and the first concave surface 31 is greater than 90 degrees, and the angle between the chamfered surface 41 and the second concave surface 32 is greater than 90 degrees. In this way, while facilitating manufacturing, the minimum size of the discharge channel at the inner corner is increased, reducing the proportion of ultra-fine powder and the deposition of coffee powder here.

[0059] In a preferred embodiment, see Figure 6 and Fig.10 The chamfered surface 41 is a single arc surface, so that the grinding blade 100 has a structure that is easy to control the size and demolding, and the chamfered surface 41 is tangent to at least one of the first concave surface 31 and the second concave surface 32. Preferably, the chamfered surface 41 is tangent to the first concave surface 31 and the second concave surface 32 respectively. In this way, the first concave surface 31 and the second concave surface 32 are connected smoothly, and no cutting edge is formed between the two, so as to avoid cutting the particles here, and reduce the friction of the discharge channel at the inner angle, so that the coffee powder can be output to the periphery more smoothly, and improve the situation that the coffee powder is stuck during the output process and causes temperature rise. In this embodiment, the radius R of the chamfered surface 41 is greater than or equal to 0.05mm and less than or equal to 0.15mm. Preferably, the radius R of the chamfered surface 41 is 0.1mm, so that the proportion of ultra-fine powder can be most effectively reduced, and the coffee powder can be discharged smoothly to avoid temperature rise.

[0060] In other embodiments, see Figure 8 , the inner chamfer structure 40 includes a plurality of chamfered surfaces 41, and the plurality of chamfered surfaces 41 intersect in sequence from the first concave surface 31 to the second concave surface 32, and the angle between each two intersecting chamfered surfaces 41 is greater than 90 degrees. In this way, the chamfered surface 41 is composed of a plurality of mutually adjacent and intersecting planes or curved surfaces. Preferably, the angle between the chamfered surface 41 intersecting with the first concave surface 31 and the first concave surface 31 is greater than 90 degrees, and the angle between the chamfered surface 41 intersecting with the second concave surface 32 and the second concave surface 32 is greater than 90 degrees. In this way, the minimum size of the discharge channel at the inner corner is increased, reducing the proportion of ultra-fine powder and the deposition of coffee powder here.

[0061] Preferably, each chamfered surface 41 is a plane or an arc surface, and the chamfered surface 41 adjacent to the first concave surface 31 is an arc surface tangent to the first concave surface 31, and / or the chamfered surface 41 adjacent to the second concave surface 32 is an arc surface tangent to the second concave surface 32. The first concave surface 31 and the second concave surface 32 are connected smoothly, and no cutting edge is formed between them as much as possible to avoid cutting of particles there, and reduce the friction of the discharge channel at the inner corner, so that the coffee powder can be discharged to the periphery more smoothly, and the situation that the coffee powder is stuck and causes temperature rise during the discharge process is improved.

[0062] Please continue reading Fig.11 and Fig.12The recessed portion 30 passes through the outer peripheral side 12, and in the radial projection view of the grinding cutter disc 100, the inner chamfer structure 40 is located at the bottom of the recessed portion 30. In this way, the cross section of the discharge channel in the direction leading to the peripheral side has a shape that is as smooth as possible and has low friction, ensuring smooth powder discharge and avoiding temperature rise.

[0063] See also Fig.12 In the radial projection view of the grinding blade 100, the axial dimension H of the recessed portion 30 is greater than or equal to 0.22 mm and less than or equal to 0.32 mm. Preferably, the axial dimension H of the recessed portion 30 is 0.27 mm, so as to ensure that the ground coffee powder has an optimal particle size ratio and improve the coffee flavor.

[0064] In a preferred embodiment, the grinding blade 100 is integrally formed and made of ceramic. The grinding blade 100 in the prior art is usually made of metal, but due to its hardness, the stability of the metal blade is low. Long-term use will also reduce the sharpness of the blade, affecting the stability of the powder output, and causing the service life of the metal blade to be lower than that of the ceramic blade. Compared with metal blades, ceramic blades are harder and more wear-resistant, which can ensure long-term stability and are more suitable for commercial coffee production scenarios.

[0065] In addition, when the metal blade disc is used to continuously make less than two cups of coffee, the coffee powder temperature is lower than that of the ceramic blade disc. However, when more than three cups of coffee are continuously made, the coffee powder temperature rises faster than that of the ceramic blade disc. Therefore, compared with the grinding blade disc 100 made of metal material, the grinding blade disc 100 made of ceramic material provided in this embodiment has a lower temperature of coffee powder when continuously grinding coffee. This is because ceramic has better heat resistance than metal, which can reduce the temperature rise of the material during the grinding process, better preserve the flavor of the coffee itself, and enhance the user's tasting experience, and is therefore more suitable for commercial coffee manufacturing scenarios.

[0066] For further information, please refer to Fig. 9 and Fig.11, the peripheral side 12 includes a first peripheral side 121 adjacent to the working side 11, and a second peripheral side 122 adjacent to the end side of the first peripheral side 121 away from the working side 11, the first peripheral side 121 intersects with the working side 11 and the second peripheral side 122 respectively, and the angles between the first peripheral side 121 and the working side 11, and between the second peripheral side 122 and the second peripheral side 122 are respectively greater than 90 degrees. Preferably, the angle a between the first peripheral side 121 and the axial direction is greater than or equal to 40 degrees and less than or equal to 50 degrees. In this way, the working side 11 and the second peripheral side 122 of the base 1 are also connected by a chamfered structure, thereby improving the phenomenon that the base 1 is prone to ceramic chipping at this edge, and improving the yield rate of the grinding disc 100 during the manufacturing process.

[0067] Based on the previous embodiment, please refer to Fig.12 , the recessed portion 30 passes through the first outer peripheral side 121. In this way, the discharge channel is formed on the outer peripheral side 12 of the base 1. It can be understood that the above embodiments can be combined or implemented separately.

[0068] Obviously, the above described embodiments are only a part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, ordinary technicians in this field can make other different forms of changes or modifications without creative work, which should fall within the scope of protection of the utility model.

Claims

1. A grinding cutter disc, characterized in that: include: A base is arranged in an annular shape, the base having a working side and a peripheral side, the working side is arranged to face the grinding gap, and the peripheral side is arranged around the periphery of the base; as well as, a grinding tooth group formed on the working side, the grinding tooth group comprising a plurality of outer blades distributed at intervals along the circumferential direction on the working side, each of the outer blades extending from the outer circumferential side to the middle of the working side, a recessed portion formed between each two adjacent outer blades, each of the recessed portions at least partially recessed relative to the outer blades to have a first concave surface adjacent to the front side of the outer blades in the rotation direction, and a second concave surface located in front of the first concave surface, the outer blades forming a partial edge of the first concave surface; Wherein, the first concave surface and the second concave surface are arranged at an angle and are connected via an inner chamfer structure.

2. The grinding blade according to claim 1, characterized in that: The inner chamfer structure includes a single chamfered surface.

3. The grinding blade according to claim 2, characterized in that: The chamfered surface is a plane or a curved surface, and an angle between the chamfered surface and the first concave surface is greater than 90 degrees, and an angle between the chamfered surface and the second concave surface is greater than 90 degrees.

4. The grinding blade according to claim 2, characterized in that: The chamfered surface is a curved surface, and the chamfered surface is tangent to at least one of the first concave surface and the second concave surface.

5. The grinding blade according to claim 4, characterized in that: The chamfered surface is tangent to the first concave surface and the second concave surface respectively.

6. The grinding blade according to claim 4, characterized in that: The radius R of the chamfered surface is greater than or equal to 0.05 mm and less than or equal to 0.15 mm.

7. The grinding blade according to claim 1, characterized in that: The inner chamfer structure includes a plurality of chamfered surfaces, which intersect in sequence between the first concave surface and the second concave surface, and the angle between each two intersecting chamfered surfaces is greater than 90 degrees.

8. The grinding blade according to claim 7, characterized in that: Each of the chamfered surfaces is a plane or an arc surface, and the angle between the chamfered surface intersecting with the first concave surface and the first concave surface is greater than 90 degrees, and the angle between the chamfered surface intersecting with the second concave surface and the second concave surface is greater than 90 degrees.

9. The grinding blade according to claim 8, characterized in that: Each of the chamfered surfaces is a plane or an arc surface, and the chamfered surface adjacent to the first concave surface is an arc surface tangent to the first concave surface, and / or the chamfered surface adjacent to the second concave surface is an arc surface tangent to the second concave surface.

10. The grinding blade according to claim 1, characterized in that: The recessed portion passes through the outer peripheral side, and in a radial projection view of the grinding cutter disc, the inner chamfer structure is located at the bottom of the recessed portion.

11. The grinding blade according to claim 10, characterized in that: In the radial projection view of the grinding cutter disc, the axial dimension H of the recessed portion is greater than or equal to 0.22 mm and less than or equal to 0.32 mm.

12. The grinding blade according to claim 10, characterized in that: The peripheral side includes a first peripheral side adjacent to the working side, and a second peripheral side adjacent to the end side of the first peripheral side away from the working side, the first peripheral side intersects with the working side and the second peripheral side respectively, and the angles between the first peripheral side and the working side, and between the second peripheral side and the second peripheral side are respectively greater than 90 degrees.

13. The grinding blade according to claim 12, characterized in that: An included angle a between the first outer peripheral side and the axial direction is greater than or equal to 40 degrees and less than or equal to 50 degrees.

14. The grinding blade according to claim 12, characterized in that: The recessed portion passes through the first outer peripheral side.

15. The grinding blade according to any one of claims 1 to 14, characterized in that The grinding blade disc is integrally formed and made of ceramic.

16. A grinding device, characterized in that: include: A first cutter disc and a second cutter disc, wherein the first cutter disc and the second cutter disc are coaxial and relatively rotatable, and working sides of the first cutter disc and the second cutter disc are axially opposite to each other to form a grinding gap between the first cutter disc and the second cutter disc; Wherein, at least one of the first cutter disc and the second cutter disc is a grinding cutter disc as described in any one of claims 1 to 15.

17. A beverage preparation device, characterized in that: Comprising the grinding device as claimed in claim 16.

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