Multi-tooth-shaped grinding cutter

Abstract

The invention discloses a multi-tooth-shaped grinding tool which comprises an outer grinding disc and an inner grinding disc. The inner wall of the outer grinding disc comprises a first tooth-shaped part, a second tooth-shaped part and a third tooth-shaped part which are sequentially arranged. The inner millstone is positioned in the center of the outer millstone; a grinding space is formed by the side wall of the inner grinding disc, the first tooth-shaped part, the second tooth-shaped part and the third tooth-shaped part; when the inner grinding disc and the outer grinding disc rotate relative to each other, coffee beans can be ground in a grinding space formed by the inner grinding disc and the outer grinding disc, and when the coffee beans sequentially pass through a first tooth-shaped part, a second tooth-shaped part and a third tooth-shaped part to be subjected to multi-stage treatment, the grinding degree range of coffee powder is effectively guaranteed, and the grinding efficiency is improved. The particle size requirements of different types of brewing instruments can be met.

Description

Technical Field

[0001] The invention relates to the field of grinding structures, in particular to a multi-tooth grinding tool. Background Art

[0002] As the pace of life continues to accelerate, people's material requirements are getting higher and higher. In order to drink fresh, high-quality coffee, many users have put forward higher requirements for coffee grinders. A high-quality grinder requires a high-quality and efficient grinding tool assembly; therefore, a grinding tool assembly is particularly necessary for a coffee grinder; specifically, in the process of configuring coffee drinks, there are different brewing methods, such as hand brewing, French press, espresso machine, moka pot, etc., which need to be ground according to the type or roasting degree of coffee beans to maximize the quality of coffee beans; then, different brewing methods require different coffee bean grinding particle sizes. For example, for the same dark roasted beans, hand brewing requires a larger particle size, and espresso machine requires a finer particle size; therefore, if the grinder grinds the coffee beans In the processing steps, it is expected by industry technicians that the particle size generated can have a larger control range; in the existing technology, the core grinding discs of the coffee bean grinder are generally divided into two types: conical grinding discs and flat grinding discs, and the two types of grinding discs have their own advantages and disadvantages; among them, the conical grinding disc can form smaller particles and is widely used in the industry. The conical grinding disc can be structurally divided into an annular outer grinding wheel and a frustum-shaped inner grinding disc. The inner wall of the inner grinding disc is formed with a grinding tooth surface, and the outer wall of the outer grinding wheel is provided with another grinding tooth surface that cooperates with the grinding tooth surface. The two grinding tooth surfaces constitute a space for grinding coffee beans; however, in the existing technology, the structure between the inner grinding disc and the outer grinding wheel is relatively simple, and it is impossible to generate a grinding effect with a wider particle size range; therefore, a more reasonable structural solution is urgently needed to solve the problems of the existing technology and meet the expectations of industry technicians. Summary of the Invention

[0003] The present invention provides a solution to the technical problem that the structure between the inner grinding disc and the outer grinding wheel in the prior art is relatively simple and cannot produce a grinding effect with a wide range of particle sizes.

[0004] To achieve the above object, the present invention provides a multi-tooth grinding tool, comprising: An outer grinding disc, wherein the inner wall of the outer grinding disc comprises a first tooth-shaped portion, a second tooth-shaped portion and a third tooth-shaped portion arranged in sequence; an inner grinding disc, the inner grinding disc being located in the center of the outer grinding disc; a side wall of the inner grinding disc and the first tooth-shaped portion, the second tooth-shaped portion, and the third tooth-shaped portion forming a grinding space; When the coffee beans pass through the grinding space, powder bodies with gradually smaller particle size ranges are formed in the regions corresponding to the first tooth-shaped portion, the second tooth-shaped portion, and the third tooth-shaped portion.

[0005] As an improved solution of the present application, the first tooth shape is obtained by arranging a preset number of inner peripheral blades in a spiral shape, and any two adjacent inner peripheral blades form a bean falling channel; the preset number of the inner peripheral blades is 6-10.

[0006] As an improved solution of the present application, the inner peripheral cutting edge is arranged in a spiral alternating manner according to a first helical angle α1 and a second helical angle α2; the first helical angle α1 is 95-105 degrees; the second helical angle α2 is 70-80 degrees.

[0007] As an improved solution of the present application, the second tooth-shaped portion is located on the tip of the inner peripheral blade, and the length L1 of the second tooth shape is 20%-35% of the height H1 of the outer grinding disc.

[0008] As an improved solution of the present application, multiple groups of the second tooth-shaped portions are arranged at intervals according to expected spacings.

[0009] As an improved solution of the present application, the third tooth-shaped portion includes a first section and a second section connected to each other, wherein the first section forms a first fine grinding surface with continuous undulations in the bean-falling channel and is connected to the second tooth-shaped portion.

[0010] As an improved solution of the present application, the second division forms a second fine grinding surface connected to the first fine grinding surface on the inner wall; the ratio of the tooth groove width W2 of the second division to the tooth groove width W2 of the first division is 0.4-0.5.

[0011] As an improved solution of the present application, the inner grinding disc consists of an outer peripheral blade and a grinding tooth portion; the outer peripheral blade and the inner peripheral blade together form a main crushing area, and the grinding tooth portion and the third tooth portion form a main grinding area.

[0012] As an improved solution of the present application, the grinding tooth-shaped portion forms a sub-grinding portion on the edge portion of the peripheral blade, and the sub-grinding portion and the second tooth-shaped portion form an anti-jumping area.

[0013] As an improved solution of the present application, the helix angle α3 of the peripheral cutting edge is 55-65 degrees, and the number of the peripheral cutting edges is 6-9.

[0014] The beneficial effects of the present invention are as follows: compared with the prior art, the present invention provides a multi-toothed grinding tool, comprising an outer grinding disc and an inner grinding disc: the inner wall of the outer grinding disc comprises a first tooth-shaped portion, a second tooth-shaped portion and a third tooth-shaped portion arranged in sequence; the inner grinding disc is located in the center of the outer grinding disc; the side wall of the inner grinding disc and the first tooth-shaped portion, the second tooth-shaped portion and the third tooth-shaped portion form a grinding space; when the inner grinding disc and the outer grinding disc rotate relative to each other, the grinding space formed by the two can grind coffee beans, and when the coffee beans pass through the first tooth-shaped portion, the second tooth-shaped portion and the third tooth-shaped portion in sequence to obtain multi-stage processing, thereby effectively ensuring the grinding degree range of the coffee powder, and can adapt to the particle size requirements required by different types of brewing equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a plan view schematic diagram of the present invention; Figure 2 It is a three-dimensional schematic diagram of the present invention; Figure 3 It is a three-dimensional schematic diagram of the outer grinding disc of the present invention; Figure 4 This is a schematic perspective view of the outer grinding disc of the present invention from another angle; Figure 5 It is a front view of the end face of the outer grinding disc of the present invention; Figure 6 is a cross-sectional view of the outer grinding disc of the present invention; Figure 7 Schematic diagram of parameters of the outer grinding disc of the present invention; Figure 8 It is a three-dimensional schematic diagram of the inner grinding disc of the present invention; Figure 9 Schematic diagram of the grinding space of the present invention.

[0016] The main component symbols are described as follows: 1. Outer grinding disc; 11. First tooth-shaped portion; 111. Inner peripheral blade; 12. Bean dropping channel; 12. Second tooth-shaped portion; 13. Third tooth-shaped portion; 131. First subsection; 132. Second subsection; 14. Circular arc; 15. First parameter circle; 16. Second parameter circle; 2. Inner grinding disc; 21. Peripheral blade; 22. Grinding tooth portion; 221. Sub-grinding portion; 3. Grinding space; 31. First gap; 32. Second gap; 33. Third gap. DETAILED DESCRIPTION

[0017] In order to more clearly illustrate the present invention, the present invention will be further described below with reference to the accompanying drawings.

[0018] In the following description, example details are provided to provide a deeper understanding of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. It should be understood that the specific embodiments are only used to illustrate the present invention and are not intended to limit the present invention.

[0019] It should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the existence of the stated features, integers, steps, operations, elements or components, but do not exclude the existence or addition of one or more other features, integers, steps, operations, elements, components or combinations thereof.

[0020] Regarding the technical problem that the structure between the inner grinding disc and the outer grinding wheel in the prior art is relatively simple and cannot produce a grinding effect with a wide range of particle sizes, please refer to the attached Figure 1 To the attached Figure 9 The present application provides a multi-tooth grinding tool, comprising an outer grinding disc 1 and an inner grinding disc 2: the inner wall of the outer grinding disc 1 comprises a first tooth-shaped portion 11, a second tooth-shaped portion 12, and a third tooth-shaped portion 13 arranged in sequence; the inner grinding disc 2 is located in the center of the outer grinding disc 1; the side wall of the inner grinding disc 2 and the first tooth-shaped portion 11, the second tooth-shaped portion 12, and the third tooth-shaped portion 13 form a grinding space 3; When coffee beans pass through the grinding space 3 , powder bodies with gradually smaller particle sizes are formed in the regions corresponding to the first tooth-shaped portion 11 , the second tooth-shaped portion 12 , and the third tooth-shaped portion 13 .

[0021] The following is a further explanation of the present application in conjunction with a specific usage scenario: either the outer grinding disc 1 or the inner grinding disc 2 is connected to an external power source, the power source is started to make the outer grinding disc 1 and the inner grinding disc 2 rotate relative to each other, and the coffee beans in the grinding space 3 are ground by physical contact; for the specific grinding steps, please refer to Figure 9 , it can be understood that in the grinding space 3, the first tooth-shaped portion 11, the second tooth-shaped portion 12 and the third tooth-shaped portion 13 form corresponding gaps, which are recorded as the first gap 31, the second gap 32 and the third gap 33. The first gap 31, the second gap 32 and the second gap 32 constitute the aforementioned grinding space 3. It is worth noting that in order to clearly show the first gap 31, the second gap 32 and the third gap 33, the applicant will Figure 9 The lines formed by the tooth-shaped parts in the figure are appropriately erased, which is a strategy for those skilled in the art to better understand the solution of this application. Figure 9The coffee beans enter the first gap 31, and the first tooth-shaped portion 11 cooperates with the inner grinding disc 2 to crush the coffee beans. The resulting powder particles are relatively large, and this stage is called "coarse grinding" in the industry. The powder body after the "coarse grinding" stage falls into the second gap 32. Since the main body of the inner grinding disc 2 is in the shape of a cone, the first gap 31 corresponds to the middle part of the inner grinding disc 2, so the gap spacing of the second gap 32 is smaller than that of the first gap 32. The spacing of the first gap 31 can produce a finer powder grinding effect, which is called "fine grinding" in the industry; finally, the "fine grinding" is completed; the powder body that has completed the "fine grinding" stage falls into the third gap 33. At this time, the spacing of the third gap 33 is smaller than the spacing of the second gap 32. The coffee powder falling into this position is ground for the third time. In this grinding stage, the particle size of the coffee powder gradually becomes uniform and the particle size is distributed within the target value. This stage is called "fine grinding" in the industry. After the "fine grinding" stage is completed, the obtained Coffee powder is brewed; in the specific brewing options, taking hand-poured coffee and espresso as examples, the particle size required for hand-poured coffee is larger, to be maintained between 400 and 600 microns. Under this particle size, the water flow of the hand-poured pot can smoothly carry the coffee extract through the filter paper and be collected in the container. If the particle size is smaller than the above range, the outflow of hot water will be hindered, resulting in over-extraction, and the resulting coffee drink will have an astringent taste and the flavor of the coffee beans cannot be extracted; if an espresso machine is used to prepare espresso, compared with hand-poured coffee, The particle size required for brewing coffee needs to be smaller, maintained between 200 and 300 microns. Since the water output and temperature of the espresso machine are relatively stable, if the particle size is not within the above difference, the excessively large particle size will lead to insufficient extraction of the coffee powder and loss of the flavor of the coffee beverage. For the control of the particle size, the distance between the outer grinding disc 1 and the inner grinding disc 2 can be increased or decreased to change the distance between the first gap, the second gap and the third gap constituting the grinding space 3, thereby processing coffee powder with a suitable expected particle size distribution.

[0022] It can be seen that when the inner grinding disc 2 and the outer grinding disc 1 rotate relative to each other, the grinding space 3 formed by the two can grind the coffee beans. When the coffee beans pass through the first tooth-shaped portion 11, the second tooth-shaped portion 12 and the third tooth-shaped portion 13 in sequence, they are processed in multiple stages, thereby effectively ensuring the grinding range of the coffee powder and being able to adapt to the particle size requirements of different types of brewing equipment.

[0023] Further preferred improvements to the inner grinding disc 2 and the outer grinding disc 1 are further described through the following examples.

[0024] In this embodiment, the first tooth-shaped portion 11 is obtained by arranging a preset number of inner peripheral blades 111 in a spiral shape, and any two adjacent inner peripheral blades 111 form a bean-dropping channel 12; it is not difficult to understand that the formation of the bean-dropping channel 12 and the inner peripheral blades 111 can ensure that the coffee beans are fed smoothly and initially crushed in both directions; in a specific scheme, the inner peripheral blades 111 and the bean-dropping channel 12 form a "plum blossom"-shaped profile opening on the end surface of the outer grinding disc 1, and the profile opening is obtained by connecting a plurality of identical arcs 14 end to end in a ring shape. The intersection between two adjacent arcs 14 is the blade portion of the inner peripheral blade 111, and the arc 14 is the end surface of the groove body formed by the bean-dropping channel 12; in specific parameters, the diameter Φ1 of any arc 14 is 16mm-16.40mm. Within this parameter range, the best grinding and bean-dropping effect can be guaranteed; the outer sides of all arcs 14 are inscribed in the same first parameter circle 15, and the diameter of this parameter circle is Φ2 32mm-32.6mm. Within this range, the stability of the crushing process can be well guaranteed. If it is less than this parameter range, excessive extrusion will occur in the "coarse grinding" stage, resulting in unstable particle size distribution of the ground beans. If it is greater than this range, more coffee beans will enter the first gap 31, increasing the load, and the overall material feeding will be too fast, resulting in a short grinding schedule for the coffee beans, which will cause more obvious unevenness. On the other hand, all arcs 14 intersect in the same second parameter circle 16, and the diameter Φ3 of the second parameter circle 16 is 29.7mm-30.3mm. m. Under this size design, the size of this parameter circle can well control the material discharge space and stabilize the efficiency of powder discharge and powder discharge; if it is larger than this parameter range, problems such as uneven grinding particle size and too fast bean feeding will occur; if it is smaller than this parameter range, it will be difficult for the coffee beans to fall; it is worth understanding that the first parameter circle 15 and the second parameter circle 16 have no physical structure, but are only an important parameter required for the preparation of the bean falling channel 12 and the inner peripheral blade 111. Under the above-mentioned specific parameters, it can be ensured that the first tooth-shaped portion 11 can further take into account both the feeding smoothness and the initial crushing.

[0025] In this embodiment, adjacent inner peripheral blades 111 are arranged in a spiral arrangement alternating with each other according to a first spiral angle α1 and a second spiral angle α2; the first spiral angle α1 is 95-105 degrees; the second spiral angle α2 is 70-80 degrees; under the above-mentioned alternating design, the position of the broken coffee beans can be well corrected so that they can be accommodated in the first gap 31 to the maximum extent in the "coarse grinding" stage, and the coffee beans will not be squeezed against each other during the "coarse grinding" process, resulting in bean jumping, thereby effectively improving the feeding efficiency and grinding uniformity, and achieving better results in terms of bean jamming, heat generation and powder blockage; if the two spiral angles are not alternated, it will lead to a decrease in grinding quality, and the distribution cannot be maintained in the same expected particle size, or the distribution is relatively discrete, resulting in difficulty in determining the blending quality of the coffee powder.

[0026] In this embodiment, the second tooth-shaped portion 12 is located on the tip of the inner peripheral blade 111, and the length L1 of the second tooth shape is 20%-35% of the height H1 of the outer grinding disc 1; the second tooth-shaped portion 12 can effectively "grab" the coffee powder that has passed the "coarse grinding" state, and prevent the coffee powder in the second gap 32 from directly jumping back into the first gap 31; and if the length of the second tooth-shaped portion 12 deviates from the above-mentioned specified proportion, the beans will not be smoothly put in and the powder output will be polarized; the term "grab" used above should be understood as the second tooth-shaped portion 12 can exert a force on the coffee powder in the "fine grinding" stage, so that the coffee powder can be maintained in the second gap 32 to the greatest extent for the "fine grinding" processing characteristics.

[0027] In practice, it is found that although the second tooth-shaped portion 12 can grab the coarsely ground coffee powder, the particle size of the coarsely ground coffee powder is still relatively large. At this time, if the second tooth-shaped portion 12 is arranged too densely, a more serious "jumping bean" situation will occur, that is, the coffee powder in the second gap 32 will return to the first gap 31 during the grinding process; therefore, in this embodiment, multiple groups of second tooth-shaped portions 12 are arranged at expected intervals. Since the number of second teeth is reduced, the "grabbing force" of the coffee powder becomes lower. At this time, the particle size of the coffee powder accumulated in the second gap 32 during the "fine grinding" stage is more appropriate, which effectively reduces the "jumping bean" situation.

[0028] In this embodiment, the third tooth-shaped portion 13 includes a first division 131 and a second division 132 connected to each other. The first division 131 forms a first fine grinding surface that is continuously undulating in the bean-dropping channel 12 and is connected to the second tooth-shaped portion 12; the first division 131 can make the coffee powder that has completed "fine grinding" start the first stage of "fine grinding", and the second division 132 is used to achieve the second stage of "fine grinding". Specifically, the first fine grinding surface formed by the first division 131 has a continuously undulating part, the peak of which can increase the grinding area, and the peak and valley can provide a certain buffer for the coffee powder, thereby ensuring the smoothness of grinding, so that the coffee powder of the first stage of "fine grinding" can be more fully ground. Grinding; the second division 132 can ensure that the coffee powder that has been "finely ground" in the first stage is further ground and generates an expected particle size distribution and is finally discharged; more specifically, the second division 132 forms a second fine grinding surface connected to the first fine grinding surface on the inner wall; the ratio of the tooth groove width W2 of the second division 132 to the tooth groove width W1 of the first division 131 is 0.4-0.5. For example, the tooth groove width W1 of the first division 131 is 1.06±0.1mm, the tooth groove width W2 of the second division 132 is 2.23±0.1mm, and the number of teeth m1 is 50-70 teeth. After grinding in the second division 132, coffee powder with an expected particle size distribution is finally obtained.

[0029] In this embodiment, the inner grinding disc 2 is composed of an outer peripheral blade 21 and a grinding tooth-shaped portion 22; the outer peripheral blade 21 and the inner peripheral blade 111 together form the main crushing area, and the grinding tooth-shaped portion 22 and the third tooth-shaped portion 13 form the main grinding area; it is not difficult to understand, combined with the above-mentioned embodiment, that is, in the assembled state, the positions of the outer peripheral blade 21 and the inner peripheral blade 111 are matched, that is, the first gap 31, and the grinding tooth-shaped portion 22 corresponds to the area of the second tooth-shaped portion 12 and the third tooth-shaped portion 13, that is, the second gap 32 and the third gap 33. Gap 33; the groove formed in the peripheral blade 21 cooperates with the bean falling channel 12 to achieve efficient and stable feeding of coffee beans. Subsequently, the blades of the inner peripheral blade 111 and the peripheral blade 21 cooperate with each other to crush the coffee beans and thus complete "coarse grinding"; subsequently, "fine grinding" and "fine grinding" are achieved in turn by the grinding tooth-shaped portion 22 and the second tooth-shaped portion 12 and the second tooth-shaped portion 12 to obtain coffee powder with the expected powder diameter distribution. In the specific solution, the number of teeth m2 of the grinding tooth-shaped portion 22 is 40-60.

[0030] In this embodiment, the grinding tooth-shaped portion 22 forms a sub-grinding portion 221 on the cutting edge of the outer peripheral blade 21, and the sub-grinding portion 221 and the second tooth-shaped portion 12 form an anti-jumping area; it is not difficult to understand that the function of the sub-grinding portion 221 is the same as that of the embodiment in which the cutting edge of the second tooth-shaped inner peripheral blade 111 is arranged, both of which are for preventing the coffee powder from jumping back into the first gap 31 during the "fine grinding" process; and the first tooth-shaped portion 11 formed by the cutting edge of the inner peripheral blade 111 cooperates with each other to form two relative clamping surfaces to "grab" the coffee powder, so that the coffee powder further reduces the possibility of jumping out.

[0031] In this embodiment, the spiral angle α3 of the peripheral blade 21 is 55-65 degrees, and the number of the peripheral blades 21 is 6-9; so that α3 is within this angle range, it can ensure that the feed speed and particle uniformity are both optimally balanced. If it is greater than this range, the coffee powder enters the second gap 32 and the third gap 33 too quickly, resulting in uneven distribution of the coffee powder after "fine grinding"; if it is less than this range, during the "fine grinding" stage, the powder diameter distribution increases toward the fine powder direction, which is likely to generate a higher temperature, resulting in coffee powder. flavor loss; in the preferred solution, the number of inner peripheral blades 111 is greater than the number of outer peripheral blades 21, and the ratio is 4:3. The specific implementation method is that the number of inner peripheral blades 111 is 8 and the number of outer peripheral blades 21 is 6. Under the setting of the above parameters, the outer grinding disc 1 has a larger number of inner peripheral blades 111, which can provide more high-level crushing effects. The inner grinding disc 2 has a smaller number of outer peripheral blades 21 in order to extend the grinding contact time, balance the efficiency and uniformity of the particle size, avoid unilateral wear due to excessive use, and increase the service life of the blade.

[0032] The advantages of the present invention are: When the inner grinding disc and the outer grinding disc rotate relative to each other, the grinding space formed by the two can grind the coffee beans. When the coffee beans pass through the first tooth-shaped portion, the second tooth-shaped portion and the third tooth-shaped portion in sequence, they are processed in multiple stages, thereby effectively ensuring the grinding range of the coffee powder and being able to adapt to the particle size requirements of different types of brewing equipment.

[0033] The above disclosures are only several specific embodiments of the present invention, but the present invention is not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the scope of protection of the present invention.

Claims

1. A multi-tooth grinding tool, characterized in that: include: An outer grinding disc, wherein the inner wall of the outer grinding disc comprises a first tooth-shaped portion, a second tooth-shaped portion and a third tooth-shaped portion arranged in sequence; an inner grinding disc, the inner grinding disc being located in the center of the outer grinding disc; a side wall of the inner grinding disc and the first tooth-shaped portion, the second tooth-shaped portion, and the third tooth-shaped portion forming a grinding space; When the coffee beans pass through the grinding space, powder bodies with gradually smaller particle size ranges are formed in the regions corresponding to the first tooth-shaped portion, the second tooth-shaped portion, and the third tooth-shaped portion.

2. A multi-tooth grinding tool according to claim 1, characterized in that: The first tooth shape is formed by arranging a preset number of inner peripheral blades in a spiral shape, and a bean falling channel is formed between any two adjacent inner peripheral blades; the preset number of the inner peripheral blades is 6-10.

3. A multi-tooth grinding tool according to claim 2, characterized in that: The inner peripheral cutting edges are arranged in a spiral arrangement alternating with each other according to a first spiral angle α1 and a second spiral angle α2; the first spiral angle α1 is 95-105 degrees; and the second spiral angle α2 is 70-80 degrees.

4. The multi-tooth grinding tool according to claim 2, characterized in that: The second tooth-shaped portion is located on the tip of the inner peripheral edge, and the length L1 of the second tooth-shaped portion is 20%-35% of the height H1 of the outer grinding disc.

5. The multi-tooth grinding tool according to claim 4, characterized in that: The plurality of groups of the second tooth-shaped portions are arranged at intervals according to a desired spacing.

6. The multi-tooth grinding tool according to claim 2, characterized in that: The third tooth-shaped portion includes a first sub-portion and a second sub-portion connected to each other, wherein the first sub-portion forms a first fine grinding surface that is continuously undulating in the bean-falling channel and is connected to the second tooth-shaped portion.

7. The multi-tooth grinding tool according to claim 6, characterized in that: The second branch forms a second fine grinding surface on the inner wall connected to the first fine grinding surface; the ratio of the tooth groove width W2 of the second branch to the tooth groove width W2 of the first branch is 0.4-0.

5.

8. The multi-tooth grinding tool according to claim 4, characterized in that: The inner grinding disc consists of an outer peripheral blade and a grinding tooth-shaped portion; the outer peripheral blade and the inner peripheral blade together form a main crushing area, and the grinding tooth-shaped portion and the third tooth-shaped portion form a main grinding area.

9. The multi-tooth grinding tool according to claim 8, characterized in that: The grinding tooth-shaped portion forms a sub-grinding portion on the edge portion of the peripheral blade, and the sub-grinding portion and the second tooth-shaped portion form an anti-skidding area.

10. The multi-tooth grinding tool according to claim 8, characterized in that: The helix angle α3 of the peripheral cutting edge is 55-65 degrees, and the number of the peripheral cutting edges is 6-9.

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