Grinding cutter head and preparation method thereof, grinding device and beverage brewing equipment

Abstract

The invention discloses a grinding cutterhead and a preparation method thereof, a grinding device and beverage brewing equipment. The grinding cutterhead comprises a base, a grinding tooth group and a spur group. Materials are punctured and broken by the stabbing groups to form coarse particles, and the coarse particles enter the grinding gap from the inner peripheries of the two cutter heads and then are further cut and ground by the grinding tooth groups, so that the temperature rise degree of the materials in the grinding process is reduced, the grinding efficiency is improved, the original flavor of the materials can be more kept, and the taste of drinks is improved. The preparation method of the grinding cutterhead comprises the following steps: adding ethanol into aluminum oxide powder, grinding, mixing, drying and sieving to obtain first powder; the first powder and a binder are mixed, mixed and granulated, and injection molding feed is obtained; carrying out injection molding on the injection molding feed to obtain a ceramic green body; degreasing the injection-molded ceramic body to obtain a ceramic blank; and sintering the ceramic blank at a first preset temperature, and machining to form a finished ceramic cutter.

Description

Grinding blade and preparation method thereof, grinding device, and beverage brewing equipment Technical Field

[0001] The present invention relates to the technical field of coffee utensils, and in particular to a grinding blade disc and a preparation method thereof, a grinding device, and beverage brewing equipment. Background Art

[0002] The grinding burrs directly determine the quality of a cup of coffee. The tooth shape of the burrs mainly affects the powder output efficiency of the burrs. If the tooth shape is not designed properly, the coffee bean breaking cycle will be prolonged. At the same time, the friction of the coffee powder in the grinding process will be increased, causing the temperature of the coffee powder to rise during the grinding process, causing the aroma elements in the coffee powder to volatilize prematurely, which will directly affect the final coffee quality.

[0003] Especially in commercial coffee machines, since there are certain requirements for the cup-dispensing efficiency of coffee machines in business, coffee machines usually need to work continuously for a long time. The grinding device, as a very important working unit of a commercial coffee machine, 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 disc in the grinding device is the core component for grinding coffee beans.

[0004] To this end, a scraper disposed on the outer periphery of the grinding disc can be provided to scrape and throw out the material overflowing from the grinding gap, so that the finished powder formed by grinding can leave the discharge opening as quickly as possible to improve the grinding efficiency. However, after long-term use, agglomerated materials are often deposited between the scraper and the disc, resulting in reduced discharge efficiency and affecting the hygiene of the grinding device and the coffee machine. In order to maintain the discharge efficiency of the grinding device, the user needs to frequently clean the grinding disc and the scraper, which affects the user experience. It should be noted that the description of the background technology in the present invention is not limited to the prior art.

[0005] Metal knives are noisy and heat up quickly at high speeds. Continuous use over a long period of time can lead to excessive heat buildup. For example, in a coffee machine, high-speed grinding of coffee beans heats up quickly. Continuous use over a long period of time can lead to excessive heat buildup, causing secondary heating of the ground coffee. Metal knives are also relatively hard, so the cutting edge can wear over time, causing the ground coffee to become coarser. With a Mohs hardness of around 100, metal knives are also prone to rust, and in humid environments, the surface of the knife can oxidize, potentially affecting human health.

[0006] Compared to metal knives, ceramics offer low specific gravity, high strength, excellent thermal stability, and corrosion resistance, making them the most promising engineering material for modern industry and cutting-edge technology. Ceramic knives are wear-resistant, high-density, high-hardness, lack pores, resist dirt and grime, are non-metallic and rust-resistant, leave no metallic taste, are lightweight and sharp, easy to handle and cut, and clean, possessing many qualities unmatched by metal knives. Ceramic knives have a Mohs hardness of 9, second only to diamond (10), the world's hardest substance. Therefore, as long as they are not dropped, impacted, or used for chopping or cutting, they never require sharpening under normal use. For security reasons, manufacturers often mix metal powder into the blade to make ceramic knives detectable by metal detectors.

[0007] However, the mechanical properties of ceramic knives in the prior art are not high, and their antibacterial and corrosion resistance are poor. Summary of the Invention

[0008] Therefore, the present invention aims to provide a grinding disc, a grinding device and a beverage brewing device that improve the efficiency of material grinding and the quality of finished beverages.

[0009] In order to solve the above technical problems, the present invention provides a grinding cutter head, comprising:

[0010] a base, the base being annularly arranged axially along a first direction, and having a passage axially penetrating the base, and a body annularly arranged around the outer periphery of the passage, the body having a first side and a second side oppositely arranged, the first side and the second side being sequentially arranged along the first direction;

[0011] a grinding tooth assembly, provided on the body, comprising a plurality of grinding teeth distributed circumferentially on the first side; and

[0012] The thorn group is provided on the body and includes a plurality of thorns distributed at intervals in the circumferential direction of the body. The thorn group is arranged close to the channel relative to the grinding tooth group in the radial direction.

[0013] The present invention provides a grinding device, comprising:

[0014] A first cutter disc and a second cutter disc, wherein the first cutter disc and the second cutter disc are coaxial and rotatable relative to each other, and first sides of the first cutter disc and the second cutter disc are axially opposed to each other to form a grinding gap between the first cutter disc and the second cutter disc;

[0015] Wherein, at least one of the first cutter disc and the second cutter disc is the grinding cutter disc described above.

[0016] In order to solve the above technical problems, the present invention provides a beverage mixing device, including the grinding device as described above.

[0017] The present invention provides a grinding cutter disc, comprising:

[0018] A base is arranged in an annular shape to have a channel axially passing through the base, and a body arranged in an annular manner on the outer periphery of the channel, the body having a first side and a second side arranged opposite to each other in the axial direction, the outer peripheral wall of the body including a first outer peripheral surface and a second outer peripheral surface, the first outer peripheral surface is adjacent to the first side, the second outer peripheral surface extends from the end side of the first outer peripheral surface away from the first side to the second side, the first outer peripheral surface is recessed toward the inner periphery of the body relative to the second peripheral surface; and a grinding tooth group is arranged on the first side.

[0019] The present invention also provides a method for preparing a grinding cutter disc, the method comprising the following steps:

[0020] Aluminum oxide powder is added to ethanol, ground and mixed, dried, and sieved to obtain a first powder;

[0021] The first powder is mixed with a binder, kneaded, and granulated to obtain an injection molding feed;

[0022] injection molding the injection molding feedstock to obtain a ceramic body;

[0023] Degreasing the injection-molded ceramic body to obtain a ceramic blank;

[0024] The ceramic blank is sintered at a first preset temperature and machined to form a finished ceramic tool.

[0025] The technical solution provided by the present invention has the following advantages:

[0026] The present invention provides a grinding disc, a grinding device, and a beverage mixing device. The grinding disc includes a base, a grinding tooth group, and a spur group. The base is annularly arranged axially along a first direction, and has a channel passing through the base, and a body arranged around the outer periphery of the channel, with the grinding tooth group and the spur group provided on the body. When the grinding device is in operation, a grinding gap is formed between the bodies of the two grinding discs, and the material in the channel is punctured and broken by the spur group to form coarse particles. The coarse particles enter the grinding gap from the inner periphery of the two discs, are further cut and ground by the grinding tooth group, and gradually form fine particles, which are finally output from the outer periphery of the two discs. The grinding disc provided by the present invention is provided with a puncture group, so that the material is punctured in the initial stage of grinding, replacing the process of the material being initially cut or squeezed and broken in the prior art. The puncturing action allows the material to be quickly broken into coarse particles under the action of a smaller friction force. Compared with the prior art, it shortens the material crushing cycle, reduces the friction force applied to the material during the grinding process, reduces the temperature increase of the material during the grinding process, improves the grinding efficiency, and can maintain more of the original flavor of the material, thereby improving the taste of the finished beverage.

[0027] The grinding device provided by the present invention includes a first blade disc, a second blade disc and a scraping member that are coaxial and relatively rotatable. The scraping member is located on the outer periphery of the first blade disc and / or the second blade disc, and is relatively movable relative to the discharge opening between the first blade disc and the second blade disc, for scraping off the finished material powder overflowing from the discharge opening, wherein at least one of the first blade disc and the second blade disc is the grinding blade disc provided by the present invention, the grinding blade disc includes a main body, a first side of the main body is provided with a grinding tooth group, and the second side is axially opposite to the first side. The outer peripheral wall of the main body includes a first outer peripheral surface and a second outer peripheral surface, the first peripheral surface is adjacent to the first side, and the second peripheral surface extends from the end side of the first peripheral surface away from the first side to the second side, the first peripheral surface is recessed relative to the second peripheral surface toward the inner periphery of the main body, so that a certain discharge space is formed between the scraping member and the relatively movable blade disc near the discharge opening. The finished material powder overflowing from the discharge opening is not easily agglomerated after being squeezed for a long time by the scraping member while being scraped and overflowed by the scraping member, which is conducive to maintaining the discharge efficiency and sanitary condition of the grinding device, reducing the frequency of user cleaning the grinding device, and improving the user experience.

[0028] The preparation method of the grinding cutter disc provided by the present invention comprises the following steps: adding aluminum oxide powder to ethanol, grinding and mixing, drying, and sieving to obtain a first powder; mixing the first powder with a binder, kneading, and granulating to obtain an injection molding feed; injection molding the injection molding feed to obtain a ceramic green body; degreasing the injection-molded ceramic green body to obtain a ceramic blank; sintering the ceramic blank at a first preset temperature and machining to form a finished ceramic tool, thereby effectively improving the hardness, corrosion resistance, and oxidation resistance of the grinding cutter disc. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] FIG1 is a partial cross-sectional schematic diagram of an embodiment of a grinding device provided by the present invention;

[0031] FIG2 is a schematic diagram of the three-dimensional structure of an embodiment of the grinding cutter disc in FIG1 ;

[0032] FIG3 is a front view of the grinding disc in FIG2 on the first side;

[0033] FIG4 is a cross-sectional view of the section AA in FIG3 ;

[0034] FIG5 is a partial cross-sectional schematic diagram of the section BB in FIG3 ;

[0035] FIG6 is a side view of the grinding cutter disc in FIG2 in the radial direction;

[0036] FIG7 is an enlarged schematic diagram of point C in FIG6;

[0037] FIG8 is a front view of the grinding disc in FIG3 at another rotation angle, viewed from the first side;

[0038] FIG9 is a cross-sectional view at DD in FIG8 ;

[0039] FIG10 is a schematic diagram showing a comparison of temperature rises between the grinding device provided by the present invention and the prior art;

[0040] FIG11 is a schematic diagram showing a comparison of the grinding efficiency of the grinding device provided by the present invention and the prior art;

[0041] FIG12 is a schematic diagram showing a comparison of the temperature rise of the grinding disc provided by the present invention when the grinding disc is made of ceramic material and metal material;

[0042] FIG13 is a schematic diagram showing a comparison of the continuous test efficiency of the grinding disc provided by the present invention using ceramic and metal materials;

[0043] FIG14 is a schematic diagram showing the results of particle size detection of the finished grinding product of an embodiment of the grinding disc provided by the present invention.

[0044] FIG15 is a schematic diagram of the three-dimensional structure of an embodiment of a grinding device provided by the present invention;

[0045] FIG16 is a front view of the grinding device in FIG15;

[0046] FIG17 is a cross-sectional view of a point EE in FIG16;

[0047] FIG18 is a schematic diagram of the three-dimensional structure of an embodiment of the grinding cutter disc in FIG17;

[0048] FIG19 is a schematic exploded perspective view of the grinding device in FIG17 ;

[0049] FIG20 is a schematic diagram of the assembly of the first cutter disc, the second cutter disc and the scraper in FIG19;

[0050] FIG21 is an assembly cross-sectional view of the first cutter disc, the second cutter disc, and the scraper in FIG20;

[0051] FIG22 is an enlarged schematic diagram of point F in FIG21 ;

[0052] FIG23 is an enlarged schematic diagram of point F in FIG21 , wherein the scraping member adopts another embodiment;

[0053] FIG24 is a cross-sectional view of an embodiment of the first cutter disc and the second cutter disc in FIG21;

[0054] FIG25 is a cross-sectional view of another embodiment of the first cutter disc and the second cutter disc in FIG21.

[0055] FIG. 26 is a flow chart of an embodiment of a method for preparing a grinding disc according to the present invention. DETAILED DESCRIPTION

[0056] The technical solutions of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. The present invention 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 present invention and the features therein may be combined with each other unless there is a conflict.

[0057] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0058] The present invention provides a grinding disc 100, a grinding device including the grinding disc 100, and a beverage brewing device. The present invention does not limit the specific type of beverage brewing device; the beverage brewing device may be any product that grinds a granular material to obtain a powdered material, extracts and brews the powdered material, and ultimately produces a beverage. Specifically, the beverage brewing device may be, but is not limited to, a coffee machine, a soymilk maker, or the like. For ease of understanding, the following embodiments utilize a coffee machine as an example.

[0059] The beverage dispensing device provided by the present invention includes a grinding device. It should be noted that the grinding device provided by the present invention can be a part of the beverage dispensing device to perform the function of grinding the raw materials during the beverage dispensing process. In other embodiments, the grinding device can also be used as a separate product, specifically for grinding food ingredients. Specifically, the grinding device can include, but is not limited to, a container (not shown) and a grinding assembly. The container has a grinding chamber formed therein. The grinding assembly is disposed in the grinding chamber and can grind granular materials such as coffee beans in the chamber to produce a powdered product.

[0060] The grinding assembly may include, but is not limited to, a transmission mechanism and a first and second cutter disc. At least one of the first and second cutter discs is the grinding cutter disc 100 provided by the present invention. Referring to FIG1 , the first and second cutter discs are axially coaxial and arranged side by side. The first and second cutter discs each have a first side provided with a grinding tooth assembly. The first sides of the two cutter discs are axially opposed to each other, forming a grinding gap 200 therebetween. The first and second cutter discs are rotatable relative to each other, specifically, about an axially extending rotation axis R. The first and second cutter discs each have a channel 12 axially extending through the grinding cutter disc 100. Channels 12 are used for feeding material. The dashed arrows in FIG1 indicate the material feeding path within the grinding mechanism. Granular material enters the grinding gap 200 from channel 12, where it is punctured, cut, and crushed by the grinding teeth of the two cutter discs to form a finished powdered material, which is then discharged from between the outer peripheries of the upper and second cutter discs.

[0061] The shapes and structures of the first and second blade discs can be identical or different. As shown in Figure 1, in one embodiment, both the first and second blade discs are grinding discs 100 provided by the present invention. The relative rotation of the two grinding discs 100 can be achieved as follows: In one embodiment, one of the two grinding discs 100 is a stationary disc and the other is a movable disc, and a transmission mechanism is connected to the movable disc to drive the movable disc to rotate relative to the stationary disc. In another embodiment, the two grinding discs 100 can be rotatably mounted in the container, and the transmission mechanism is connected to each of the two grinding discs 100 to drive the relative rotation of the two discs. The power source of the transmission mechanism is not limited and can be, for example, manually or electrically driven. It should be noted that in Figure 1, the first blade disc rotates clockwise relative to the second blade disc, and the second blade disc rotates counterclockwise relative to the first blade disc. However, depending on the design of the second blade disc structure, the rotation directions of the two blade discs can also be reversed.

[0062] 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 completed and in normal use, and is not applicable to its orientation during production, transportation, and assembly. The up and down directions are roughly parallel to the direction of gravity extension. The axial direction is the extension direction of the rotation axis of the grinding cutter disc 100, and the circumferential and radial directions correspond to the axial direction. The first direction is only applicable to the description of the orientation of a single grinding cutter disc 100 together with the front-to-back direction, wherein the first direction refers to a direction parallel to the axial direction and extending from the first side 111 to the second side 112 of the grinding cutter disc 100. The first direction is preferably roughly parallel to the up and down directions, and the front-to-back directions refer to directions parallel to the circumferential direction. During the rotation of the grinding cutter disc 100, the front structure of the grinding cutter disc 100 in the circumferential direction reaches the same position before the rear structure.

[0063] Figures 2 and 3 illustrate an embodiment of a grinding disc provided by the present invention. It should be noted that the figures illustrate a grinding disc 100 as a second disc. The grinding disc 100 comprises a base 1, a grinding tooth group 2, and a protrusion group 3. The base 1 is annularly arranged, extending axially in a first direction, and has a channel 12 extending axially through the base 1. A body 11 is disposed circumferentially around the periphery of the channel 12. The body 11 has a first side 111 and a second side 112 axially opposed to each other. The first side 111 and the second side 112 are arranged sequentially in the first direction, i.e., the first direction extends from the first side 111 to the second side 112. In the grinding device, the first sides 111 of the two grinding discs 100 are disposed opposite each other. It is understood that the first side 111 of the body 11 should be radially inclined in the first direction from the outer circumference to the inner circumference, so that the grinding gap 200 between the first and second discs gradually decreases from the inside to the outside, thereby facilitating the gradual grinding of large particles into powder. The grinding tooth group 2 is provided on the main body 11, and includes a plurality of grinding teeth distributed circumferentially on the first side 111. The specific shape and arrangement of the grinding teeth are not limited in this embodiment, as long as the cutting and crushing of the material can be achieved, and can be specifically designed according to the processing requirements of the material. The thorn group 3 is provided on the main body 11, and includes a plurality of thorns 31 distributed at intervals in the circumference of the main body, and the thorn group 3 is arranged close to the channel 12 relative to the grinding tooth group 2 in the radial direction. The plurality of thorns 31 are distributed approximately circumferentially at intervals on the inner periphery of the main body 11, which means that their specific setting position can be at any position along the axial direction of the inner peripheral wall 113, or can also be provided on the first side 111, and have a structure that protrudes from the inner peripheral wall 113 and extends into the channel 12 in the projection view in at least the first direction. The specific structure of each thorn 31 is not limited herein and may be, for example, a spike-shaped or arc-shaped thorn, as long as it can extend from the inner circumference of the body 11 toward the channel 12, thereby puncturing and crushing the material in the channel 12 before or during the initial stage of entering the grinding gap 200. For example, the thorns 31 may be a plurality of spike-shaped structures protruding from the inner circumferential wall 113, or the thorns 31 may be a protruding structure formed on the upper edge of the inner circumferential wall 113 and inclined toward the channel 12.

[0064] When the grinding device is in operation, a grinding gap 200 is formed between the main bodies 11 of the two grinding discs. The material in the channel 12 is punctured and broken by the spikes 31 to form coarse particles. The coarse particles enter the grinding gap 200 from the inner periphery of the two cutter discs and are further cut and ground by the grinding tooth group 2 to gradually form fine particles, which are finally output from the outer periphery of the two cutter discs. In this embodiment, the provision of the spikes 31 allows the material to be punctured in the initial stage of grinding, replacing the process of initial cutting or squeezing and breaking the material in the prior art. The puncturing action causes the material to be rapidly broken into coarse particles under the action of less friction. Compared with the prior art, this shortens the material crushing cycle, reduces the friction experienced by the material during the grinding process, reduces the temperature rise of the material during the grinding process, improves the grinding efficiency, and can more effectively preserve the original flavor of the material, thereby improving the taste of the finished beverage.

[0065] The spur group 3 can be separate from the body 11 or integrally formed with the body 11. In a preferred embodiment, the body 11, spur group 3, and grinding tooth group 2 are integrally formed, and the grinding disc 100 is made of ceramic. Conventional grinding tools are typically made of metal, but their hardness can lead to low tool stability. Over time, the sharpness of the cutting edge decreases, affecting the stability of powder discharge and resulting in a shorter tool life than ceramic tools.

[0066] Specifically, refer to Figure 12, which shows a comparison of the temperature rise of coffee powder produced by a grinding disc 100 made of a metal material and a ceramic material under continuous use. The dashed curve in the figure shows the relationship between the number of cups and the discharge temperature of the coffee powder when the metal grinding device produces multiple cups of coffee, while the solid curve shows the relationship between the number of cups and the discharge temperature of the coffee powder when the ceramic grinding device produces multiple cups of coffee. As can be seen from the figure, when the metal grinding disc 100 produces less than two cups of coffee continuously, the coffee powder temperature is lower than that of the ceramic grinding disc 100. However, when producing more than three cups of coffee continuously, the coffee powder temperature rises faster than that of the ceramic grinding disc 100. Therefore, compared with the metal grinding disc 100, the ceramic grinding disc 100 of the present embodiment produces lower coffee powder temperature during continuous grinding. This is because ceramic has better thermal insulation than metal, which can reduce the temperature rise of the material during the grinding process, better preserve the coffee flavor, and enhance the user's taste experience, making it more suitable for commercial coffee production scenarios.

[0067] Please continue to refer to Figure 13, which shows the grinding efficiency change curves of the grinding blade disc 100 provided in this embodiment, which is made of metal material and ceramic material under continuous testing scenarios. The dotted curve in the figure shows the correlation between the grinding efficiency of the metal grinding blade disc 100 and the grinding amount, and the solid curve shows the correlation between the grinding efficiency of the ceramic grinding blade disc 100 and the grinding amount. As can be seen from the figure, as the amount of coffee beans ground increases, the grinding efficiency of the ceramic blade disc decreases more slowly than that of the metal blade disc. In other words, the ceramic blade disc is harder and more wear-resistant than the metal blade disc, which can ensure long-term stability and is more suitable for commercial coffee manufacturing scenarios.

[0068] Based on the previous embodiment, please continue to refer to Figure 3. In one embodiment, the inner circumferential wall 113 of the main body 11 has multiple front side areas, and each of the front side areas is located one by one in the circumferential direction at the front side of each of the protrusions 31 in the rotation direction. In the projection of the base 1 along the first direction, each of the front side areas is recessed toward the outer periphery relative to the corresponding protrusions 31, so that each of the protrusions 31 extends forward toward the channel 12. In this embodiment, the front side area is part of the inner circumferential wall 113, and the structure in which its projection in the first direction is recessed relative to the thorns 31 can be achieved by the inner circumferential wall 113 being recessed radially outward, or by the inner circumferential wall 113 being tilted. Moreover, the recess of the front side area is tilted radially outward and backward so that each of the thorns 31 extends forward toward the channel 12, so that during the rotation of the grinding cutter disc 100, the material close to the grinding gap 200 is punctured tangentially during the rotation of the grinding cutter disc 100, and the kinetic energy it is subjected to is large, and the puncturing force is sufficient, so that the material can be broken into coarse particles in a short time, further improving the puncturing speed and shortening the grinding process.

[0069] Alternatively, referring to Figures 2 to 4 , the plurality of grinding teeth include a plurality of first blades 21 extending outward from the inner circumference of the body 11, with each of the protrusions 31 being formed one-to-one at the inner end of each first blade 21. In this embodiment, the first blade 21 refers to a linear blade-like structure in the grinding teeth that is machined and formed to extend generally radially and that can cut the material during the rotation of the grinding disc 100. It is understood that, in order to facilitate the manufacture of the grinding disc 100, compared to manufacturing a spike-like protrusion 31 structure protruding separately from the inner circumferential wall 113, molding the protrusion 31 structure at the inner end of the first blade 21 allows the shape of the protrusion 31 to be machined and formed simultaneously during the production and molding of the first blade 21, resulting in higher production efficiency and easier successful processing. Of course, for injection-molded ceramic grinding discs 100, this arrangement can also make the mold shape of the grinding disc 100 simpler, easier to demold, and higher yield.

[0070] Based on the above embodiment, please continue to refer to Figures 2 to 4. The first side 111 is at least partially recessed toward the second side 112 in the area between each adjacent two first blades 21 to form a plurality of first tooth grooves 22. The plurality of first tooth grooves 22 and the plurality of first blades 21 are alternately arranged in the circumferential direction. Each first tooth groove 22 passes through the inner circumferential wall 113 of the main body 11, so that a plurality of incisions 25 are formed on the inner circumferential wall 113. The plurality of incisions 25 and the plurality of protrusions 31 are alternately distributed in the circumferential direction, so that each protrusion 31 is located at the edge where the inner circumferential wall 113 intersects with the first side 111. In this embodiment, the thorns 31 are formed at the intersection of each first blade portion 21 and the upper end of the inner peripheral wall 113. In addition to providing the advantages of making the grinding cutter disc 100 more regular in appearance and easier to produce, each first tooth groove 22 also constitutes a radially extending guide groove that facilitates the entry of material from the channel 12 into the grinding gap 200. In this embodiment, the thorns 31 are located at the entrance of the radially extending grinding gap 200, so that the coarse particles formed by the puncture of the material during the initial grinding stage can more easily enter the grinding gap 200 under the push of the thorns 31, and then be further ground and crushed into powder by the grinding tooth group 2. As a result, in this embodiment, the material conveying path is more reasonable, reducing the path and time of material friction, thereby further improving grinding efficiency and reducing the temperature of the finished material.

[0071] Preferably, the inner circumferential wall 113 of the body 11 is tilted from the inside outward along the first direction. In this embodiment, by tilting the inner circumferential wall 113 of the body 11, each protrusion 31 protrudes beyond the edge of the inner circumferential wall 113 in the projection in the first direction and extends toward the inner periphery of the channel 12. This provides the channel 12 with a smooth surface, simplifying the structure of the grinding disc 100 and making it easier to manufacture. More importantly, the smooth and tilted inner circumferential wall 113 guides the material toward the grinding gap 200, reducing material retention within the channel 12 and preventing material accumulation therein, thereby improving grinding efficiency and making the grinding device easier to clean, enhancing the user experience. Preferably, referring to FIG. 4 , in a radial cross-section of the grinding disc 100, the angle a between the inner circumferential wall 113 and the first direction is greater than or equal to 4 degrees and less than or equal to 10 degrees. Within this range, the grinding efficiency of the grinding device can be significantly improved.

[0072] In a preferred embodiment, please continue to refer to Figures 4 and 9. Each of the cutouts 25 has a first edge 251 extending from the first blade 21 to the bottom of the preceding first tooth groove 25 in the circumferential direction, and a second edge 252 extending from the first blade 21 to the bottom of the following first tooth groove 25 in the circumferential direction. The first edge 251 is smaller in circumferential dimension than the second edge 252. The first edge 251 is distributed on the front side of the inner end of each first blade 21, and the second edge 252 is distributed on the rear side. Each first blade 21 intersects with the corresponding second edge 252 and the first edge 251 to form the corresponding spur 31. It can be understood that for a grinding disc 100 made of ceramic material, due to the characteristics of the ceramic material, the tip angle of the spur 31 is difficult to control during the molding process and has poor consistency, which can easily result in the angle of the spur 31 being not sharp enough and failing to achieve a good puncturing effect. In this embodiment, the inner peripheral wall 113 of the main body 11 is inclined so that the tip shape of the thorn 31 is formed by the intersection of the first blade portion 21 and the corresponding first edge 251 and second edge 252, so that a sufficiently sharp thorn 31 can be manufactured while meeting the characteristics of the ceramic material, so that the puncturing effect of the thorn 31 is better, and the formed shape of the thorn 31 is easy to control, has good consistency, and is easy to produce.

[0073] Furthermore, referring to Figures 8 and 9 , the cutting inclination angle β of each first edge 251 is less than 90 degrees. The cutting inclination angle β is the angle between the front side of the first edge 251 and the reference plane S2, measured in the hypothetical cross-sectional projection view corresponding to the first edge 251 (i.e., Figure 9 ). Specifically, the grinding cutter head has an axially extending rotation axis R. The hypothetical cross-sectional projection view corresponding to the first edge 251 is the projection of the grinding cutter head onto a hypothetical cutting plane S1. The hypothetical cross-sectional projection view is the schematic cross-sectional view at position DD in Figure 8 (Figure 9). The hypothetical cutting plane S1 passes through the diameter of the grinding cutter head 100 and is coplanar with the rotation axis R. As shown in Figure 9 , in the hypothetical cross-sectional projection view corresponding to any first edge 251, the rotation axis R passes through the spur 31 on the first edge 251. The reference plane S2 is a plane orthogonal to the rotation axis and passes through the spur 31.

[0074] Specifically, the cutting inclination angle β of any first edge 251 is measured as follows: Referring to FIG8 , a projection of the grinding cutter disc 100 along a first direction is obtained, resulting in a front view of the first side of the grinding cutter disc 100. A plurality of protrusions 31 are connected to form a circumferential line. A tangent line is drawn to this circumferential line at the protrusion 31 on the first edge 251 to be measured. The assumed cutting plane S1 is parallel to this tangent line and passes through the rotation axis R, thereby obtaining the assumed cutting plane S1. The grinding cutter disc 100 of this embodiment is cut along the assumed cutting plane S1, and a projection of the sectioned grinding cutter disc 100 is taken along a direction from the rotation axis R toward the protrusion 31 (i.e., parallel to the radial direction of the grinding cutter disc 100). This yields a assumed sectional projection view (as shown in FIG9 ). A plane orthogonal to the rotation axis R and passing through the protrusion 31 is selected as a reference plane S2. In the hypothetical sectional projection ( FIG. 9 ), the front side of the first edge 251 is the side facing forward in the direction of rotation. It should be noted that when the first edge 251 is a straight segment in the hypothetical sectional projection, the cutting angle β is the angle between the front side of the straight segment and the reference plane S2. When the first edge 251 is a curved segment in the hypothetical sectional projection, a tangent line can be drawn at the spur on the first edge 251, and the angle between the tangent line and the reference plane S2 is the cutting angle β. In this embodiment, the cutting angle β is less than 90 degrees and is an acute angle. This means that during the rotation of the grinding cutter head 100, the material in the channel 12 first contacts the spur 31 on the first edge 251, thereby being punctured and crushed. Compared with the technical solution in which the cutting angle β is an obtuse angle, the grinding disc 100 provided in this embodiment uses puncture instead of cutting to crush the material entering the grinding gap 200, which can effectively improve the grinding efficiency and reduce the temperature rise of the discharged material.

[0075] Preferably, the cutting inclination angle β is greater than or equal to 85 degrees and less than or equal to 87 degrees. Within this value range, the cutting efficiency of the grinding cutter disc 100 and the difficulty of the cutter disc production process can be balanced. In particular, for grinding cutter discs 100 made of ceramic material, setting the cutting inclination angle β within this range facilitates demolding during the production of the grinding cutter disc 100, resulting in a high yield rate for the finished product. Without substantially increasing the production cost of the grinding cutter disc 100, the grinding efficiency of the grinding device can be effectively improved, and the temperature rise of the finished product caused by the grinding process can be reduced.

[0076] The grinding device provided by the present invention, due to the provision of a protruding group, achieves increased grinding efficiency and a lower temperature rise. As shown in FIG10 , the temperature rise of coffee powder produced by the grinding disc 100 provided by the present invention under continuous use is compared with that produced by a conventional disc. The dashed curve in the figure illustrates the relationship between the number of cups and the discharge temperature of the coffee powder when the conventional grinding device produces multiple cups of coffee, while the solid curve illustrates the relationship between the number of cups and the discharge temperature of the coffee powder when the grinding device provided by the present invention produces multiple cups of coffee. As can be seen from FIG10 , whether used in a home setting for continuously producing three or fewer cups of coffee, or in a commercial setting for continuously producing multiple cups of coffee, the discharge temperature of the coffee powder produced by the grinding device provided by the present invention is consistently lower than that of the conventional grinding device. When producing multiple cups of coffee continuously, the temperature difference between the discharge temperatures of the coffee powder produced by the grinding device provided by the present invention can reach 4 degrees Celsius, effectively improving the taste of the finished coffee beverage and making it particularly suitable for commercial coffee production, i.e., for commercial coffee machines.

[0077] Please continue to refer to Figure 11, which shows a comparison curve of the grinding efficiency changes of the grinding device provided by this embodiment and the grinding device provided by the prior art in a continuous test scenario. The dotted line curve in the figure shows the correlation between the grinding efficiency of the grinding device provided by the prior art and the grinding amount, and the solid line curve shows the correlation between the grinding efficiency of the grinding device provided by the present invention and the grinding amount. As can be seen from the figure, as the amount of coffee beans ground increases, the grinding efficiency of the grinding device provided by the present invention decreases more slowly than that of the prior art. In other words, the provision of the protrusions 31 can effectively improve the grinding efficiency of the grinding device, ensure the long-term stability of the grinding effect, and is more suitable for commercial coffee manufacturing scenarios.

[0078] Based on the above embodiment, referring to Figures 4 and 5 , each first blade portion 21 further includes at least three blade segments that are sequentially connected from the inside out and extend upward. Preferably, the three blade segments include a first blade segment 211, a second blade segment 212, and a third blade segment 213, which are sequentially distributed from the inside out. The inner end of the first blade segment 211 forms a spur 31, the outer end of the third blade segment 213 is connected to the second blade portion 23 distributed on the outer periphery of the first side 111, and the second blade segment 212 connects the outer end of the first blade segment 211 and the inner end of the third blade segment 213. Compared with the traditional two-stage first blade 21 structure, the extension angle of the first blade 21 in this embodiment is more gentle, avoiding the sudden change in the extension direction of the first blade 21, so that during the grinding process, the coarse particles are more cut by the first blade 21 along the blade edge, rather than squeezing the coffee bean particles like the blade disc in the prior art. The particle size distribution of the coffee beans formed in this way is closer to the ideal particle size, and the extraction rate of the coffee powder produced is higher, making the taste of the brewed coffee richer and the particle size distribution more uniform, which is conducive to improving the flavor and taste of the coffee.

[0079] Further, referring to Figures 4 and 5 , along the extension direction of the first blade portion 21, each adjacent pair of blade segments forms an included angle, with the angles decreasing from the inside outward. In this embodiment, the extension direction of the first blade portion 21 is configured to change gradually, resulting in a more uniform and gradual decrease in the size of the grinding gap 200 above the first blade portion 21, which meets the varying particle size requirements of the coffee beans and provides a more rational bean breaking path design. Specifically, please refer to Figure 14, which illustrates the particle size distribution of coffee powder produced by the grinding disc 100 provided in this embodiment. The horizontal axis represents particle size in μm, the left vertical axis represents cumulative distribution, and the right axis represents distribution density. The solid line curve in the figure is the cumulative density curve, which accumulates from 0% to 100%, corresponding to the left vertical axis, indicating the proportion of particles smaller than the corresponding particle size value. As shown in the figure, the cumulative density curve does not fluctuate dramatically, indicating that the coffee powder produced by the grinding device provided by the present invention is relatively uniformly distributed, without obvious particle size discontinuities. This results in a richer, more textured finished coffee, enhancing the user experience. Further referring to Figure 14, the dashed line curve is the distribution density curve, which indicates the frequency of each particle size distribution. It can be seen that the proportion of particles between 355 μm and 710 μm in the finished coffee powder is relatively high, indicating a relatively uniform particle size distribution and a relatively low proportion of ultra-fine powder. This results in a less odorous and better-tasting brewed coffee. Generally speaking, for 18g of powder to be extracted to obtain 36g of coffee liquid at a pressure of 9 bar, the average particle size of the ground powder is optimal at around 355μm. The average particle size of the coffee powder ground by the grinding device provided in this application can reach 354.96μm, which is very close to the optimal effect value, and can provide users with coffee with the best taste.

[0080] In one embodiment, referring to Figures 6 and 7 , the plurality of grinding teeth further include a plurality of second blades 23 extending inward from the outer circumference of the body 11. The first side 111 is at least partially recessed toward the second side 112 in the region between each adjacent two second blades 23 to form a plurality of second tooth grooves 24 arranged alternately with the plurality of second blades 23 in the circumferential direction. Generally, the number of first blades 21 is less than the number of second blades 23, and the size is larger than the second blades 23. In this embodiment, through the cooperation of the first blades 21 and the second blades 23, the granular material is sequentially punctured by the thorns 31, roughly cut by the first blade 21, and finely cut and crushed by the second blade 22 during the process of passing through the grinding gap 200, thereby gradually being processed and ground from coarse particles into fine particles, with high grinding efficiency and low grinding temperature rise.

[0081] In one embodiment, each of the second tooth grooves 24 extends through the outer peripheral wall 114 of the body 11, forming a notch 26 in the outer peripheral wall 114. The axial dimension of the notch 26 is greater than or equal to 0.1 mm and less than or equal to 0.3 mm. In this embodiment, the second blade 23 further cuts and crushes the medium-sized particles formed by the first blade 21 to form the finished coffee product. The notch 26 formed by the second tooth grooves 24 in the outer peripheral wall 114 constitutes the discharge port for the coffee powder, which determines the final shape of the coffee powder. In the prior art, the size of the notch 26 is generally set to be less than 0.2 mm. In this embodiment, the size of the notch 26 is greater than or equal to 0.1 mm and less than or equal to 0.3 mm. This notch 26 not only increases the size of the discharge port, improves the discharge efficiency, and improves the grinding efficiency of the coffee powder, but also makes the particle size of the finished coffee powder closer to the optimal particle size, further improving the taste and richness of the finished coffee beverage.

[0082] In another embodiment, the ratio of the number of first blades 21 to the number of second blades 23 is greater than or equal to 1 / 8 and less than or equal to 1 / 5. In this embodiment, the number of first blades 21 primarily controls bean crushing efficiency, while the number of second blades 23 determines powder extraction efficiency. Within a certain cutter disc diameter, too few first blades 21 will reduce bean crushing efficiency. Too many first blades 21 will reduce the distance between the two first blades 21, similarly affecting bean crushing efficiency. The distribution of the second blades 23 must match that of the first blades 23. A relatively small number of second blades 23 will negatively impact powder extraction efficiency. Conversely, insufficient surface area in the grinding gap 200 will result in increased friction with coffee powder and a significant temperature rise. Based on this, in this embodiment, the number ratio of the first blade portion 21 to the second blade portion 23 is greater than or equal to 1 / 8 and less than or equal to 1 / 5. This design allows the ratio between the first blade portion 21 and the second blade portion 23 to reach a balanced state that can take into account both powder discharge efficiency and material temperature rise, so that the grinding and discharge efficiency of coffee powder is high and the temperature rise is within a suitable temperature range, ensuring that the aroma components in the coffee beans are not released prematurely, and maximizing the taste of the coffee beverage.

[0083] The present invention provides a grinding disc 100, a grinding device 1000, and a beverage brewing device incorporating the same. The present invention does not limit the specific type of beverage brewing device; the beverage brewing device may be any product that grinds a granular material to obtain a powdered material, extracts and brews the powdered material, and ultimately produces a beverage. Specifically, the beverage brewing device may be, but is not limited to, a coffee machine, a soymilk maker, or the like. For ease of understanding, the following embodiments utilize a coffee machine as an example.

[0084] The beverage brewing equipment provided by the present invention includes a grinding device 1000. It should be noted that the grinding device 1000 provided by the present invention can be a part of the beverage brewing equipment, so as to play the function of grinding the raw materials during the beverage brewing process. In other embodiments, the grinding device 1000 can also be used as a separate product, dedicated to grinding food raw materials.

[0085] Specifically, referring to Figures 15 to 19, the grinding device 1000 may include a shell 50 and a grinding assembly. As shown in Figures 17 and 19, the shape and structure of the shell 50 are not limited. A cavity 53 is formed inside the shell 50. The grinding assembly is disposed in the cavity 53 and can grind granular materials such as coffee beans in the cavity 53 to produce a powdered product. Generally speaking, at least a feed port 54 and a discharge port 55 are formed on the shell 50. When the grinding device 1000 is working, the granular material raw material enters the cavity 53 from the feed port 54, is pierced, cut, crushed, and other operations by the grinding assembly, and forms a powdered material product, which is then discharged from the discharge port 55. In one embodiment, the feed port 54 is formed at the top of the shell 50, and the discharge port 55 is formed on the circumferential side or bottom of the shell. In one embodiment, the shell 50 may include a cover body 51 and a container 52 with an open top, wherein the container 52 forms the cavity 53, the cover body 51 is arranged on the upper side of the container 52, and the feed port 54 is opened, and the peripheral side of the container 52 is provided with the discharge port 55 connected to the cavity 53.

[0086] Continuing with Figures 16, 17, and 19, the grinding assembly may include, but is not limited to, a transmission mechanism 60 and a first cutter disc 10 and a second cutter disc 20. The first cutter disc 10 and the second cutter disc 20 are coaxial and arranged sequentially in the axial direction. The first cutter disc 10 and the second cutter disc 20 are rotatable relative to each other about a rotation axis, with the rotation axis extending in the axial direction of the first cutter disc 10 and the second cutter disc 20. Referring to Figure 21, at least one of the first cutter disc 10 and the second cutter disc 20 is a grinding cutter disc 100 according to the present invention. A grinding gap 200 is formed axially between the first cutter disc 10 and the second cutter disc 20. The grinding gap 200 has a discharge opening 33 connecting the outer peripheries of the first cutter disc 10 and the second cutter disc 20. As shown in Figure 20, the discharge openings 33 are arranged in a ring shape. A grinding tooth set 2 is provided on the side of the first cutter disc 10 facing the second cutter disc 20 and on the side of the second cutter disc 20 facing the first cutter disc 10. The specific shape and number of each grinding tooth set 2 are not limited. The first cutter disc 10 and the second cutter disc 20 are also respectively formed with a channel 12 extending axially therethrough, and have a body 11 arranged around the outer periphery of the channel 12. The channels 12 of the first cutter disc 10 and the second cutter disc 20 together constitute a carrying space to accommodate the material entering from the feed port 54 and waiting for the grinding gap 200. In a preferred embodiment, the first cutter disc 10 is disposed above the second cutter disc 20 so that the carrying space is located below the feed port 54. Specifically, during the relative rotation of the first cutter disc 10 and the second cutter disc 20, the granular raw material enters the grinding gap 200 from the carrying space under the action of centripetal force. After being punctured, cut, and crushed by the coordinated operations of the grinding tooth groups 2 of the two cutter discs, the powdered material is formed into a finished product, which overflows from the discharge opening 33 to the outer periphery of the first cutter disc 10 and the second cutter disc 20 into the accommodating cavity 53 and is finally discharged from the discharge port 55.

[0087] The material of the first blade disc 10 and the second blade disc 20 is not limited, for example, they can be metal or ceramic. Preferably, the first blade disc 10 and the second blade disc 20 in this embodiment are both made of ceramic. The grinding blade discs in the prior art are usually made of metal. However, due to its hardness and material properties, the stability of the tool is low and the temperature rise is too fast. Long-term use will also reduce the sharpness of the cutting edge, affecting the stability of the powder output, and causing the tool life to be lower than that of ceramic tools. In addition, compared with the grinding blade disc made of metal material, the grinding blade disc made of ceramic material 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. Especially in the case of continuously grinding multiple cups of coffee, the advantages of the grinding blade disc made of ceramic material are more obvious. In other words, the ceramic blade disc is harder and more wear-resistant than the metal blade disc, which can ensure long-term stability and is more suitable for commercial coffee manufacturing scenarios.

[0088] It should be noted that in the embodiments provided herein, the description of directionality applies only to the orientation of the product after assembly and normal use, and does not apply to its orientation during production, transportation, or assembly. The axial direction is the direction of extension of the rotational axes of the first and second cutter discs 10 and 20. The circumferential and radial directions correspond to the axial direction. The vertical direction is parallel to the axial direction and is generally parallel to the direction of gravity.

[0089] The specific structure of the transmission mechanism 60 is not limited, and its power source can be manual or electric drive. The relative rotation of the first cutter disc 10 and the second cutter disc 20 can be achieved as follows: In one embodiment, one of the first cutter disc 10 and the second cutter disc 20 is a stationary cutter disc installed in the accommodating chamber 53, and the other is a movable cutter disc rotatably installed in the housing 50. The transmission mechanism 60 is connected to the movable cutter disc to drive the movable cutter disc to rotate relative to the stationary cutter disc. In another embodiment, the first cutter disc 10 and the second cutter disc 20 can be rotatably installed in the housing 50, and the transmission mechanism 60 is connected to the first cutter disc 10 and the second cutter disc 20 to drive the two cutter discs to rotate in opposite directions.

[0090] In the embodiment provided by the present invention, referring to Figures 15 to 23, the grinding assembly further includes a scraper 40. The scraper 40 is disposed in the housing 50 and is located on the outer periphery of the first blade disc 10 and / or the second blade disc 20. The scraper 40 is movably disposed relative to at least one of the first blade disc 10 and the second blade disc 20, i.e., is located on the outer periphery of the discharge opening 33. The scraper 33 is spaced apart from the relatively movable first blade disc 10 and / or the second blade disc 20, and thus spaced apart from the discharge opening 33, and is configured to scrape off material overflowing from the discharge opening 33. In this embodiment, the scraper 40 can be disposed in various ways. For example, the scraper 40 can be mounted on or integrally formed with the inner wall 533 of the housing 50 and protrude toward the discharge opening 33. Thus, the scraper 40 scrapes off material overflowing from the discharge opening 33 during the rotation of the first blade disc 10 and / or the second blade disc 20. The material is thrown off under the action of centrifugal force, thereby accelerating the discharge speed of the grinding device 1000.

[0091] In other embodiments, referring to FIG. 17 , the scraper 40 is disposed in a radial gap between the inner wall 533 of the cavity 53 and the discharge opening 33 and is movable relative to both. This allows the scraper 40 to scrape off material that overflows from the discharge opening 33 while also scraping off material that may adhere to the inner wall 533, thereby further cleaning the inner wall 533 of the housing 50. Preferably, a flexible scraper (not shown) is disposed at the outer end of the scraper. The flexible scraper should radially protrude relative to the outer periphery of the scraper 40 and slide into contact with the inner wall 533 during the rotation of the scraper 40 relative to the housing 50, further cleaning and removing material adhered to the inner wall 533, thereby preventing powder from clumping and adhering to the wall and thus avoiding material accumulation. The flexible scraper has a deformable structure, such as a brush or a rubber strip, so that the flexible scraper does not hinder the rotation of the scraper 40 relative to the housing 51 and can more thoroughly clean the inner wall 533.

[0092] In this embodiment, during the operation of the grinding device 1000, the powdered material formed by grinding the granular material in the grinding gap 200 overflows from the discharge opening 33 to the periphery, and the scraper 40 moves relative to the discharge opening 33, thereby scraping the powdered material overflowing from the discharge opening 33, so that the powdered material is accelerated to peel off from the periphery of the cutter disc and is thrown to the periphery of the grinding component under the action of centrifugal force, thereby improving the discharge efficiency of the grinding device 1000, reducing the grinding time of the material in the grinding device 1000, reducing the temperature rise of the material during the grinding process, improving the taste of the finished beverage, and at the same time avoiding the accumulation of material at the periphery of the first cutter disc 10 and the second cutter disc 20, thereby improving the hygiene of the grinding device 1000.

[0093] Referring to Figures 17 and 19 , the scraper 40 includes an inner sidewall 422 radially facing the first or second blade disc 10, 20, and correspondingly, facing the discharge opening 33, and an outer sidewall 421 facing away from the first or second blade disc 10, 20, and correspondingly, facing away from the discharge opening 33. The inner sidewall 422 is radially spaced from the outer periphery of at least one of the first or second blade discs 10, 20, while the outer sidewall 421 is radially spaced from the inner wall 533 of the housing 50. In this embodiment, the scraper 40 is plate-shaped and has a relatively small radial dimension, thereby enabling the grinding device 1000 to have a compact structure and a relatively small size. Preferably, as shown in Figure 17 , the radial spacing between the outer sidewall 421 and the inner wall 533 is greater than or equal to 0.5 mm. This prevents the gap between the inner wall 533 and the outer sidewall 421 from being too small, causing material to become stuck and affecting the rotation of the scraper 40. It should be noted that, in this embodiment, the radial spacing between the outer wall 421 and the inner wall 533 can be measured as follows: on each axial section of the grinding device 1000, the minimum spacing between the outer wall 421 and the inner wall 533 is measured, and the minimum spacing is the radial spacing between the outer wall 421 and the inner wall 533.

[0094] On the basis of the previous embodiment, as shown in FIG19 , the inner side wall 422 and the outer side wall 421 are both arc surfaces. In the cross section of the grinding device 1000 in the axial direction, the contour of the inner side wall 422 is consistent with the outer peripheral contour of the first cutter disc 10 and / or the second cutter disc 20, and the contour of the outer side wall 421 is consistent with the inner peripheral contour of the inner wall 533. In this embodiment, the contours are consistent, which means that in this cross section, the contours of the two are roughly parallel. Preferably, the shell 50 is cylindrical, and the inner side wall 422 and the outer side wall 421 are both arranged as arc surfaces. In this embodiment, such an arrangement makes the overall structure of the grinding device 1000 in the radial direction more compact on the one hand, and on the other hand, makes the gap between the inner side wall 422 and the discharge opening 33 basically consistent, and the gap between the outer side wall 421 and the inner wall 533 basically consistent, and each surface has a relatively smooth surface, thereby reducing the occurrence of jamming.

[0095] Further, please continue to refer to Figures 17 and 19. The circumferential size of the inner wall 422 is larger than that of the outer wall 421. At least one end side of the outer wall 421 in the circumferential direction that is closer to the front in the rotation direction is correspondingly connected to the circumferential end side of the inner wall 422 through a guide bevel 42. Preferably, the two end sides of the outer wall 421 in the circumferential direction are respectively connected to the two end sides of the inner wall 422 in the circumferential direction through a guide bevel 42, and each of the guide bevels 42 is inclined toward the inner wall 422 in the direction away from the outer wall 421 in the circumferential direction. In this embodiment, the guide bevel 42 serves, on the one hand, to reduce the contact area between the hanging plate and the powdered material and reduce the resistance to the rotation of the scraper 40; on the other hand, it guides the powdered material radially toward the outer periphery of the first cutter disc 10 and the second cutter disc 20 and throws it out, thereby preventing the powdered material from accumulating outside the discharge opening 33, improving the hygiene of the grinding device 1000, making it easier to clean, reducing the odor of the finished coffee product, and improving the taste of the coffee beverage.

[0096] Continuing with Figure 17 , the first cutter disc 10 is positioned above the second cutter disc 20 and is vertically adjustable within the housing 50, enabling vertical adjustment of the grinding gap 200. This can be achieved in a variety of ways, such as by providing a vertically extending guide member on the housing 50 to slidably mount the first cutter disc 10 within the housing 50. In one embodiment, the first cutter disc 10 is secured to the underside of a cover 51, which is threadedly engaged with the upper side of the housing 50. Rotating the cover 51 relative to the housing 50 adjusts the vertical position of the first cutter disc 10, thereby controlling the size of the grinding gap 200. This allows the axial size of the grinding gap 200 to vary between 0.02 mm and 0.2 mm. When the first cutter disc 10 is adjusted to its highest position, the upper edge of the discharge opening 33 is lower than the upper edge of the scraper 40. Specifically, the highest point of the discharge opening 33 is lower than the lowest point of the top of the scraper 40. In this embodiment, the scraper 40 is arranged so that its upper end is always higher than the upper edge of the discharge opening 33 to prevent the scraping effect of the scraper 40 from being weakened when the grinding gap 200 increases.

[0097] Preferably, referring to Figures 19 and 20, there are multiple scraping members 40, optionally, four can be provided, and the multiple scraping members 40 are distributed at intervals along the periphery of the discharge opening 33, thereby increasing the frequency of scraping of the outer hanging plate of the discharge opening 33, further avoiding the accumulation and blockage of powdered materials outside the discharge opening 33, and increasing the discharge speed.

[0098] Based on the above embodiment, referring to Figures 18 to 25 , the present invention further provides a grinding cutter disc 100. At least one of the first cutter disc 10 and the second cutter disc 20 is the grinding cutter disc 100. The structures of the first cutter disc 10 and the second cutter disc 20 can be identical or different. Specifically, at least one of the first cutter disc 10 and the second cutter disc 20 that is movable relative to the scraping member is configured as the grinding cutter disc 100, or both the first cutter disc 10 and the second cutter disc 20 are configured as the grinding cutter disc 100.

[0099] The specific structure of the grinding disc 100 provided by the present invention is described below.

[0100] Referring to Figure 18 , in one embodiment of the present invention, a grinding cutter head 100 comprises a base 1 and a grinding tooth assembly 2. The base 1 is annularly arranged, having a channel 12 extending axially through the base 1, and a body 11 disposed circumferentially around the channel 12. The body 11 has a first side 111 and a second side 112 axially opposed to each other, with the grinding tooth assembly 2 disposed on the first side 111. It is understood that the first side 111 of the body 11 should be inclined radially toward the second side 112 from the outer circumference to the inner circumference, so that the grinding gap 200 gradually decreases from the inside to the outside, facilitating the gradual grinding of materials from large particles to powder. The grinding tooth assembly 2 is disposed on the body 11 and includes a plurality of grinding teeth distributed circumferentially around the first side 111. The specific shape and arrangement of the grinding teeth are not limited in this embodiment, as long as they can achieve cutting and crushing of the material, and can be designed based on the material processing requirements. Continuing with FIG18 , the outer peripheral wall 205 of the body 11 includes a first outer peripheral surface 2051 and a second outer peripheral surface 2052. Both the first outer peripheral surface 2051 and the second outer peripheral surface 2052 extend along the circumference of the outer peripheral wall 205 and surround the outer periphery of the body 11. In a radial direction, the first outer peripheral surface 2051 is adjacent to the first side 111, and the second outer peripheral surface 2052 extends from the end of the first outer peripheral surface 2051 away from the first side 111 toward the second side 112.

[0101] Specifically, the first outer circumferential surface 2051 is entirely distributed between the end side of the first outer circumferential surface 2051 and the first side 111, and the second outer circumferential surface 2052 may be entirely distributed radially between the end side of the first outer circumferential surface 2051 and the second side 112, that is, the second outer circumferential surface 2052 extends from the end side of the first outer circumferential surface 2051 away from the first side 111 to the second side 112. Alternatively, the second outer circumferential surface 2052 may be distributed radially only in a partial area between the end side of the first outer circumferential surface 2051 and the second side 112, and may be disposed at least adjacent to the first outer circumferential surface 2051, that is, other circumferential surfaces may be disposed between the second circumferential surface 2052 and the second side 112. The first outer peripheral surface 2051 is recessed toward the inner periphery of the main body 11 relative to the second outer peripheral surface 2052. The specific recessing method is not limited. For example, the first outer peripheral surface 2051 may be bent or tilted from the second outer peripheral surface 2052 toward the first side 111 as a whole, or a radial step may be formed between the first outer peripheral surface 2051 and the second outer peripheral surface 2052.

[0102] It can be understood that in the grinding device 1000 provided in this embodiment, the powdered material at the discharge opening 33 has just been ground and has a relatively high temperature. This is subject to pressure from the scraping action of the scraper 40, making it more susceptible to agglomeration. If the distance between the scraper 40 and the discharge opening 33 is too small, the material at the discharge opening 33 will easily agglomerate and become clogged. However, if the distance is too large, effective scraping will be ineffective. The first outer peripheral surface 2051 is recessed toward the inner circumference of the body 11 relative to the second outer peripheral surface 2052, creating a certain discharge space between the scraper 40 and the relatively movable cutter disc near the discharge opening 33. While the finished powder overflowing from the discharge opening 33 is scraped and overflowed by the scraper 40, it is less likely to agglomerate due to prolonged compression by the scraper 40. This helps maintain the discharge efficiency and sanitation of the grinding device 1000, reduces the frequency of cleaning the grinding device 1000, and enhances the user experience.

[0103] Furthermore, referring to Figures 18 and 24 , in one embodiment, the first outer peripheral surface 2051 is inclined toward the inner circumference of the body 11 in the direction extending from the second outer peripheral surface 2052 toward the first side 111. Preferably, in a radial cross-section of the grinding cutter head 100, the angle a between the first outer peripheral surface 2051 and the axial direction is greater than 0 degrees and less than 10 degrees. In this embodiment, this configuration creates a suitably sized discharge space between the first outer peripheral surface 2051 and the scraper 40. While ensuring the scraping and discharging effectiveness of the scraper 40, it also increases the gap between the scraper 40 and the discharge opening 33, preventing material powder that has just overflowed near the discharge opening 33 from agglomerating and adhering to the discharge opening 33, thereby reducing discharge efficiency and affecting the hygiene of the grinding device 1000. This improves the clumping and adhesion of material on the outer side of the cutter head, preventing the discharge efficiency from being excessively reduced due to long-term continuous grinding, reducing the frequency of cleaning the grinding device 1000, and improving the user experience.

[0104] Furthermore, referring to Figures 18 and 25 , the first outer peripheral surface 2051 is radially smaller than the second outer peripheral surface 2052, so that a step 206 is formed between the first outer peripheral surface 2051 and the second outer peripheral surface. Specifically, in this embodiment, a radial step is formed between the first outer peripheral surface 2051 and the second outer peripheral surface 2052. Preferably, the radial dimension s of the step 206 is greater than or equal to 0.15 mm and less than or equal to 0.25 mm. In this embodiment, such a setting, on the one hand, allows a discharge space of appropriate size to be formed between the first outer peripheral surface 2051 and the scraper 40, while ensuring the scraping and discharging effect of the scraper 40, thereby increasing the gap between the scraper 40 and the discharge opening 33, thereby preventing the material powder that has just overflowed near the discharge opening 33 from being compressed and agglomerated, and adhering to the vicinity of the discharge opening 33, resulting in reduced discharge efficiency and affecting the sanitation of the grinding device 1000, thereby improving the material agglomeration and adhesion on the outside of the cutter disc, ensuring that the discharge efficiency will not be reduced too much due to long-term continuous grinding, reducing the frequency of users cleaning the grinding device 1000, and improving the user experience.

[0105] Based on the above embodiment, the axial width of the first outer peripheral surface 2051 is not limited. In a preferred embodiment, the axial dimension of the first outer peripheral surface 2051 is H1, the axial dimension of the outer peripheral wall 205 is H, and H1 / H is greater than or equal to 1 / 3 and less than or equal to 2 / 3. This configuration not only allows the axial dimension of the discharge space to be compatible with the scraper 40, providing optimal discharge efficiency, but also facilitates the manufacture of the grinding disc 100. For example, when the grinding disc 100 is injection molded from a ceramic material, it facilitates demolding.

[0106] Based on the above embodiments, in one embodiment provided by the present invention, referring to Figures 17 to 22 , the first and second blade discs 10, 20 in a grinding device 1000 are both grinding blade discs 100 provided by the present invention. The grinding gap 200 has a discharge opening 33 connecting the outer peripheries of the first and second blade discs 10, 20. The first outer peripheral surface 2051 of the first blade disc 10 and the second outer peripheral surface 2052 of the second blade disc 20 are disposed axially on opposite sides of the discharge opening 33, defining an annular groove 70 located on the outer peripheries of the first and second blade discs 10, 20. The discharge opening 33 is located at the bottom of the annular groove 70. This creates an enlarged gap between both axial sides of the discharge opening 33 and the inner sidewall 422 of the scraper 40, facilitating discharge and protecting high-temperature powder that has just overflowed from the discharge opening 33 from being squeezed by the scraper 40 and clumping against the wall or adhering to the discharge opening 33, thereby preventing discharge efficiency from being reduced.

[0107] The first outer peripheral surface 2051 and the second outer peripheral surface 2052 on the first cutter head 10 are adjacent to each other to form a first edge 71 defining the annular groove 70. The first edge 71 may have a step or may be formed by the intersection of the second outer peripheral surface 2052 and the second outer peripheral surface 2052. The first outer peripheral surface 2051 and the second outer peripheral surface 2052 on the second cutter head 20 are adjacent to each other to form a second edge 72 defining the annular groove 70. The first edge 71 may have a step or may be formed by the intersection of the second outer peripheral surface 2052 and the second outer peripheral surface 2052. The scraper 40 is fixedly mounted on or integrally formed with the second cutter disc 20 on its outer circumference, and is rotatably arranged relative to the first cutter disc 10 along with the second cutter disc 20. The scraper 40 has a fixed end 401 fixed to the second cutter disc 20 and a free end 402 axially located relatively close to the first cutter disc 10. The free end 402 has a radial gap with the first cutter disc 10 and is axially located between the first edge 71 and the second side 112 of the first cutter disc 10. In this way, the scraper 40 can completely cover the outer circumference of the annular groove 70 in the axial direction, ensuring that the scraper 40 scrapes and removes powder from the annular groove 70, thereby improving discharge efficiency.

[0108] In a preferred embodiment, as shown in FIG23 , the first outer peripheral surface 2051 and the second outer peripheral surface 2052 are connected by an arc-shaped chamfer at the first edge 71. This makes the surface of the first edge 71 smoother, making it less likely for material powder to adhere and accumulate there, reducing the resistance of the material to sliding against the inner sidewall 422 of the scraper 40, improving discharge efficiency while reducing dead corners and facilitating cleaning.

[0109] And / or, in another embodiment, please continue to refer to Figure 23, the end face of the free end 402 is inclined from the inside to the outside in a direction away from the second blade disc 20, so that an enlarged opening is formed at the upper end of the scraper 40, so that the material powder not only flows out from both sides of the scraper 40, but also can further overflow from the free end 402, i.e. the upper end, of the scraper 40 when the discharged powder increases, thereby improving the discharge efficiency, while reducing sanitary dead corners, and making the grinding device 1000 easier to clean.

[0110] Referring to Figures 17 to 21 , in one embodiment, the grinding assembly further includes a chassis 41 for rapidly rotating the movable cutter disc. The chassis 41 is connected to one of the first cutter disc 10 and the second cutter disc 20 and is in transmission connection with a transmission mechanism 60, allowing it to be rotatably disposed relative to the other of the first and second cutter discs 10 and 20 under the power source. In one embodiment, further referring to Figure 21 , a scraper 40 can be disposed on one of the first and second cutter discs 10 and 20 for relative rotation. This eliminates the need for a separate drive mechanism for the scraper 40, reducing production costs while achieving improved scraping performance. Preferably, the second cutter disc 20 is rotatably mounted within the housing 50. The scraper 40 can be fixedly mounted with the second cutter disc 20 or integrally formed with the outer periphery of the second cutter disc 20. In one embodiment, the scraper 40 is connected to the chassis 41, thereby being fixedly mounted to the second cutter disc 20 and rotatably disposed relative to the first cutter disc 10 along with the second cutter disc 20. In this embodiment, the first cutter disc 10 is non-rotatably mounted relative to the housing 50, preferably fixedly mounted to the cover 51, and is vertically adjustable relative to the cover 51. The second cutter disc 20 is driven by the transmission mechanism 60 to rotate relative to the first cutter disc 10, and the scraper 40 rotates accordingly.

[0111] Referring to Figure 17 , the chassis 41 is fixed to the underside of the second cutter disc 20, preferably being screwed to the chassis 41 via countersunk bolts. The scraper 40 is disposed on the outer periphery of the chassis 41 and protrudes from the upper side of the chassis 41. The chassis 41 defines an axially extending shaft hole 411, and the transmission mechanism 60 includes a transmission shaft keyed to the shaft hole 411. The specific structure of the transmission mechanism 60 is not limited, as long as it is rotatably connected to the chassis 41 and drives the chassis 41 to rotate the second cutter disc 20 about the rotation axis. For example, a gear can be disposed on the circumference of the chassis 41, and the chassis 41 can be driven to rotate by a drive gear or worm that meshes with the gear. In this embodiment, a shaft hole 411 is vertically defined through the middle of the chassis 41. The shaft hole 411 is located below the second passage 22. The transmission mechanism 60 includes a drive shaft 61, which is rotatably mounted to the housing 50 via a bearing 63 and is driven by a power source located outside the housing 50. The drive shaft 61 is keyed to the shaft hole 411. Preferably, a nut 62 is provided on the upper end of the drive shaft 61 to secure the chassis 41 and the drive shaft 61. The scraper 40 extends upwardly from the outer circumference of the chassis 41. In this embodiment, the drive shaft 61 serves to mount and secure the second cutter disc 20 and the scraper 40, while driving both to rotate relative to the first cutter disc 10. The scraper 40 and the second cutter disc 20 are assembled together to form an upwardly open carrying space to accommodate the material to be ground, so that the granular material moves toward the grinding gap 200 and is discharged radially from the discharge opening 33 between the first cutter disc 10 and the second cutter disc 20. The scraper 40 moves along the outer periphery of the discharge opening 33 as the second cutter disc 20 rotates, thereby scraping off the powdered material on the outer periphery of the discharge opening 33 to avoid clogging of the discharge opening 33, thereby improving the grinding efficiency of the grinding device 1000, reducing the passage time of the material in the grinding gap 200, reducing the temperature rise of the material during the grinding process, and improving the taste of the finished coffee.

[0112] Based on the above embodiment, referring to Figures 17, 22, and 23, the scraper 40 has an inner sidewall 422 radially facing the first cutter disc 10. The inner sidewall 422 is radially spaced from the outer periphery of the first cutter disc 10. A stepped surface 433 is formed on the inner sidewall 422, facing the free end 401. The stepped surface 433 is radially located between the first side 111 of the second cutter disc 20 and the second edge 72. This arrangement ensures that the stepped surface 433 is lower than the lower edge of the discharge opening 33 and higher than the lower side of the annular groove 70. This creates a relatively wide discharge space between the outer side of the discharge opening 33 and the scraper 40, preventing high-temperature material from being squeezed and agglomerated during scraping by the scraper. Furthermore, the discharge space has a cross-sectional dimension that is smaller at the bottom and larger at the top, guiding the discharged powder toward the upper area of ​​the discharge space, where it overflows from the sides and top of the scraper 40, rather than being deposited downward on the upper side of the base 41. This improves discharge efficiency while reducing material deposition on the base 41, reducing the frequency of user cleaning of the grinding device and enhancing the user experience. Preferably, referring to FIG23 , the inner sidewall 422 includes a sidewall segment 43 extending from the stepped surface 433 toward the fixed end. The sidewall segment 43 is aligned with the second outer peripheral surface 2052 of the second blade disc 20. Thus, when the second blade disc 20 is fixedly mounted to the base 41, powdered material is prevented from entering the gap between the inner sidewall 422 of the scraper 40 and the outer periphery of the second blade disc 20 and from agglomerating on the upper side of the base 41. This prevents sanitary blind spots, makes the grinding device 1000 easier to clean, and guides the powdered material to be discharged from the sides and top of the scraper 40, leaving the discharge space, thereby improving discharge efficiency.

[0113] The present invention provides a method for preparing a grinding cutter disc. Referring to FIG. 26 , the method for preparing a ceramic cutting tool comprises the following steps:

[0114] Step S100, adding aluminum oxide powder to ethanol, grinding and mixing, drying, and sieving to obtain a first powder;

[0115] It should be understood that the particle size, distribution, and shape of the aluminum oxide powder significantly impact the properties of the injection molding feedstock described below. Spherical powders facilitate flow and molding, so ball milling is used for grinding the aluminum oxide powder. Smaller first powder particle sizes result in a wider particle size distribution, and spherical or near-spherical shapes are preferred. This effectively increases the powder's ultimate packing density and ultimate loading capacity, while also lowering sintering temperatures and minimizing shrinkage and deformation. Furthermore, if the first powder's particle size is too small, particles tend to agglomerate, making it difficult to mix the powder and binder.

[0116] In this embodiment, the particle size of the aluminum oxide powder is 0.5 μm to 3 μm. In other embodiments, the particle size of the aluminum oxide powder can also be 1 μm, 1.5 μm, 2 μm, or 2.5 μm. This ensures that the first powder is easily mixed with the binder while maintaining a high bulk density, low cost, and preventing agglomeration.

[0117] Step S200, mixing the first powder with the binder, kneading, and granulating to obtain injection molding feed;

[0118] It should be noted that the adhesive includes polyvinyl alcohol, polyethylene glycol, and sodium carboxymethyl cellulose; wherein the content ratio of the polyvinyl alcohol, polyethylene glycol, and sodium carboxymethyl cellulose is (3.1-3.5): (5.8-5.9): 1, which has better fluidity.

[0119] The key to granulation is to select a suitable binder, so that the binder has good compatibility with the ceramic powder and good shear dispersibility to eliminate agglomeration; in addition, the appropriate binder content makes the material have good fluidity, increases the loading capacity (solid content) of the ceramic powder, and reduces dimensional deformation.

[0120] In other embodiments, the binder may also be a mixture of paraffin wax, high-density polyethylene, dibutyl phthalate, and stearic acid, wherein the content ratio of paraffin wax, high-density polyethylene, dibutyl phthalate, and stearic acid is (13.1-13.5): (7.1-7.5): 1:1.

[0121] Step S300, injection molding the injection molding feedstock to obtain a ceramic body;

[0122] It should be noted that the injection molding process involves uniformly filling the mold cavity with the injection material to obtain the final shape of the blank. Among these factors, injection pressure, holding pressure, injection temperature, and injection time all influence the quality of the final product and the formation of defects. The injection pressure ensures that the feed material is injected into the mold cavity and completely filled. As the injection molding process nears its end, the holding pressure phase begins, during which the injection molding machine continuously replenishes the mold cavity with feed material to fill the volume vacated by the blank due to shrinkage. The injection molding temperature must be controlled within a certain range. Too low a temperature results in poor feed material flow, while too high a temperature can easily decompose the binder, both of which affect product quality. A reasonable injection time can improve the surface quality of the blank and reduce dimensional tolerances. Stable flow of the injection material during the injection molding process, ensuring uniform filling of the mold cavity, is crucial. The rheological behavior of the injection molding feed material is complex, and the rheological properties of the slurry system are primarily evaluated by the slurry viscosity, which reflects the degree of mixing uniformity within the slurry. That is, under the premise of the same mixing process and the same solid phase content, the smaller the viscosity value, the better the compatibility and uniformity of the ceramic particles and the binder system.

[0123] In addition, during the ceramic injection molding process, defects caused by unreasonable injection parameter settings include undershot, flash, cracking, density gradient, etc. In order to reduce the occurrence of such defects, the injection molding filling process can be simulated by computer.

[0124] In a specific implementation, the step of injection molding the injection molding feed to obtain a ceramic body includes:

[0125] Step S310, placing the injection molding feed in an injection molding machine, and heating the injection molding feed to transform it into a viscous melt;

[0126] In this embodiment, the injection molding feed in the form of a viscous melt has a pressure of less than 80 Pa·s.

[0127] More specifically, the heating temperature in step S310 is 95°C-115°C, and the mixing speed during heating is 400r / min-500r / min. At this time, the viscosity of the injection molding feed is lower and the uniformity is better. In this embodiment, the heating temperature can also be 100°C, 105°C, or 110°C.

[0128] Step S320: injecting the injection molding feed in the form of a viscous melt into a metal mold, cooling and demoulding, and obtaining a ceramic body.

[0129] More specifically, the injection molding feed in the form of a viscous melt is injected into a metal mold at a second preset temperature and a preset pressure, and then cooled and demolded to obtain a ceramic body.

[0130] Among them, the second preset temperature is 260℃-270℃ (in other embodiments, the second preset temperature can also be 261℃, 262℃, 263℃, 264℃, 265℃, 266℃, or 267℃), and the preset pressure is 100MPa-110MPa (in other embodiments, the preset pressure is 101MPa, 102MPa, 103MPa, 104MPa, 105MPa, 106MPa, or 107MPa).

[0131] Step S400, degreasing the injection-molded ceramic body to obtain a ceramic blank;

[0132] Plastic injection molding (PIM) offers unique advantages over traditional molding processes: it can produce small, complex, and highly dimensionally precise special-shaped parts. Due to mold flow, the green body density is uniform, and the sintered product has excellent performance. Furthermore, due to its near-net-shape nature, the prepared parts require virtually no post-machining, significantly reducing residual stress in the ceramic material. This significantly reduces processing costs while ensuring material stability and reliability. As a new ceramic preparation technology for mass-producing small, complex parts, injection molding has effectively improved the manufacturing process of advanced ceramic materials.

[0133] It should be noted that degreasing is the process of removing the binder components in the injection-molded ceramic blank by physical or chemical methods. Due to the different binder systems, there are differences in the degreasing process. Since a large amount of organic binder is added in the feed preparation process, in order to ensure the performance and dimensional accuracy of the molded blank after sintering, the added binder must be removed completely. The degreasing process is based on the different components of the organic binder. The degreasing methods for injection-molded ceramics include: thermal degreasing, solvent degreasing, and catalytic degreasing. Select an efficient and safe degreasing technology for degreasing to obtain a blank. If the degreasing process adopts incorrect process methods and parameters, the shrinkage of different parts of the blank will be inconsistent, causing defects such as cracking, bubbling, and deformation of the blank, and these defects cannot be compensated in subsequent processes. Therefore, degreasing is a very critical step that affects product quality and manufacturing costs.

[0134] Taking thermal debinding as an example, the principle of thermal debinding is to evaporate or crack the binder by heating, thereby removing it from the green body. The thermal debinding process is simple and low-cost, but the debinding time is long and it is only suitable for ceramic parts with smaller cross-sectional dimensions. During the thermal debinding process, different debinding atmospheres have different effects on the cracking rate and cracking activation energy. The generation of green body defects during the thermal debinding process of ceramics is related to the binder removal rate, and the defects at the mutation point of the thermal decomposition rate of the binder are the most serious. Therefore, the binder system must have a wide debinding temperature range to stabilize the binder removal rate in the green body, thereby reducing green body defects.

[0135] In this embodiment, the degreasing temperature ranges from 40° C. to 50° C., which achieves the best degreasing rate and prevents the ceramic blank from bubbling, cracking, etc. In other embodiments, the degreasing temperature may be 41° C., 42° C., 43° C., 44° C., 45° C., 46° C., or 47° C.

[0136] Step S500: sintering the ceramic blank at a first preset temperature and machining it to form a finished ceramic cutting tool.

[0137] It should be noted that before step S500 and after step S400, machining is usually required first, which mainly involves trimming the external dimensions and removing burrs.

[0138] The performance of ceramic products is largely determined by sintering. Alumina ceramics must be sintered to a high density and uniformity. In this embodiment, the first preset temperature is 1300°C to 1800°C, which results in a higher density and uniformity.

[0139] Preferably, the first preset temperature is 1400° C. to 1600° C., and the sintering time is 30 min to 100 min. In other embodiments, the first preset temperature is 1500° C.

[0140] The preparation method of the grinding cutter disc provided by the present invention comprises the following steps: adding aluminum oxide powder to ethanol, grinding and mixing, drying, and sieving to obtain a first powder; mixing the first powder with a binder, kneading, and granulating to obtain an injection molding feed; injection molding the injection molding feed to obtain a ceramic green body; degreasing the injection-molded ceramic green body to obtain a ceramic blank; sintering the ceramic blank at a first preset temperature and machining to form a finished ceramic tool, thereby effectively improving the hardness, corrosion resistance, and oxidation resistance of the grinding cutter disc.

[0141] To achieve the above objectives, the present invention further provides a grinding blade disc, which is manufactured using the above-mentioned grinding blade disc manufacturing method. Embodiments of the grinding blade disc include embodiments of the above-mentioned grinding blade disc manufacturing method. The beneficial effects of the above-mentioned grinding blade disc manufacturing method can be applied to the grinding blade disc and will not be described in detail here.

[0142] Example Preparation Method of Grinding Blade

[0143] S1, adding aluminum oxide powder to ethanol, grinding and mixing, drying, and sieving to obtain a first powder;

[0144] The particle size of the aluminum oxide powder is 0.5 μm to 3 μm.

[0145] S2, mixing the first powder with a binder, kneading, and granulating to obtain an injection molding feed;

[0146] The adhesive comprises polyvinyl alcohol, polyethylene glycol, and sodium carboxymethyl cellulose; wherein the content ratio of the polyvinyl alcohol, polyethylene glycol, and sodium carboxymethyl cellulose is (3.1-3.5): (5.8-5.9):1.

[0147] Alternatively, the binder may be a mixture of paraffin wax, high-density polyethylene, dibutyl phthalate, and stearic acid, wherein the content ratio of paraffin wax, high-density polyethylene, dibutyl phthalate, and stearic acid is: (13.1-13.5): (7.1-7.5): 1:1

[0148] S3, injection molding the injection molding feed to obtain a ceramic body;

[0149] S31, the injection molding feed is placed in an injection molding machine, and heated to convert the injection molding feed into a viscous melt;

[0150] S32, injecting the injection molding feed in the form of a viscous melt into a metal mold at a second preset temperature and a preset pressure, cooling and demolding to obtain a ceramic body.

[0151] The injection molding feed material is a viscous melt with a pressure of less than 80 Pa·s, the heating temperature is 95°C-115°C, the mixing speed during heating is 400r / min-500r / min, the second preset temperature is 260°C-270°C, and the preset pressure is 100MPa-110MPa.

[0152] S4, degreasing the injection-molded ceramic body to obtain a ceramic blank;

[0153] The degreasing temperature ranges from 40°C to 50°C.

[0154] S5, sintering the ceramic blank at a first preset temperature and machining it to form a finished ceramic cutting tool.

[0155] The first preset temperature is 1400° C. to 1600° C., and the sintering time is 30 min to 100 min.

[0156] In order to further verify the preparation method of the grinding cutter disc provided by the present invention, the performance of the grinding cutter disc prepared by the present invention is described below in the form of examples and comparative examples. Example

[0157] S1, taking 40 parts of aluminum oxide powder, adding 3 mol of ethanol, grinding and mixing, drying, and sieving to obtain a first powder; wherein the particle size of the aluminum oxide powder is 0.5 μm.

[0158] S2, mixing the first powder with a binder, kneading, and granulating to obtain injection molding feed; wherein the binder includes polyvinyl alcohol, polyethylene glycol, and sodium carboxymethyl cellulose; wherein the content ratio of the polyvinyl alcohol, polyethylene glycol, and sodium carboxymethyl cellulose is 3.1:5.8:1.

[0159] S31, the injection molding feed is placed in an injection molding machine, and heated to convert the injection molding feed into a viscous melt;

[0160] S32, injecting the injection molding feed in the form of a viscous melt into a metal mold at a second preset temperature and a preset pressure, cooling and demolding to obtain a ceramic body.

[0161] The injection molding feed of the viscous melt is 75 Pa·s, the heating temperature is 95°C, the mixing speed during heating is 500 r / min, the second preset temperature is 260°C, and the preset pressure is 100 MPa.

[0162] S4, degreasing the injection-molded ceramic body to obtain a ceramic blank; wherein the degreasing temperature range is 40°C.

[0163] S5, sintering and machining the ceramic blank at a first preset temperature to form a finished ceramic cutting tool, wherein the first preset temperature is 1400° C. and the sintering time is 30 minutes. Example

[0164] S1, taking 40 parts of aluminum oxide powder, adding 3 mol of ethanol, grinding and mixing, drying, and sieving to obtain a first powder; wherein the particle size of the aluminum oxide powder is 1 μm.

[0165] S2, mixing the first powder with a binder, kneading, and granulating to obtain injection molding feed; wherein the binder includes polyvinyl alcohol, polyethylene glycol, and sodium carboxymethyl cellulose; wherein the content ratio of the polyvinyl alcohol, polyethylene glycol, and sodium carboxymethyl cellulose is 3.2:5.9:1.

[0166] S31, the injection molding feed is placed in an injection molding machine, and heated to convert the injection molding feed into a viscous melt;

[0167] S32, injecting the injection molding feed in the form of a viscous melt into a metal mold at a second preset temperature and a preset pressure, cooling and demolding to obtain a ceramic body.

[0168] The injection molding feed rate of the viscous melt is 750 Pa·s, the heating temperature is 100°C, the mixing speed during heating is 500 r / min, the second preset temperature is 265°C, and the preset pressure is 100 MPa.

[0169] S4, degreasing the injection-molded ceramic body to obtain a ceramic blank; wherein the degreasing temperature range is 40°C.

[0170] S5, sintering and machining the ceramic blank at a first preset temperature to form a finished ceramic cutting tool, wherein the first preset temperature is 1400° C. and the sintering time is 30 minutes. Example

[0171] S1, take 50 parts of aluminum oxide powder, add 3 mol of ethanol, grind and mix, dry, and sieve to obtain a first powder; wherein the particle size of the aluminum oxide powder is 2 μm.

[0172] S2, mixing the first powder with a binder, kneading, and granulating to obtain injection molding feed; wherein the binder includes polyvinyl alcohol, polyethylene glycol, and sodium carboxymethyl cellulose; wherein the content ratio of the polyvinyl alcohol, polyethylene glycol, and sodium carboxymethyl cellulose is 3.3:5.8:1.

[0173] S31, the injection molding feed is placed in an injection molding machine, and heated to convert the injection molding feed into a viscous melt;

[0174] S32, injecting the injection molding feed in the form of a viscous melt into a metal mold at a second preset temperature and a preset pressure, cooling and demolding to obtain a ceramic body.

[0175] The injection molding feed of the viscous melt is 75 Pa·s, the heating temperature is 110°C, the mixing speed during heating is 500 r / min, the second preset temperature is 270°C, and the preset pressure is 105 MPa.

[0176] S4, degreasing the injection-molded ceramic body to obtain a ceramic blank; wherein the degreasing temperature range is 45°C.

[0177] S5, sintering and machining the ceramic blank at a first preset temperature to form a finished ceramic cutting tool, wherein the first preset temperature is 1400° C. and the sintering time is 30 minutes.

[0178] Comparative Example 1

[0179] Conventional ceramic cutting tools in the prior art.

[0180] Among them, the mechanical properties are evaluated by "high", "medium" and "low", and the antibacterial and corrosion resistance are also evaluated by "high", "medium" and "low". The mechanical properties, antibacterial and corrosion resistance of Examples 1 to 3 are all high, while the mechanical properties, antibacterial and corrosion resistance of Comparative Example 1 are medium or low.

[0181] In summary, by comparing the embodiments and the comparative examples, it can be concluded that the mechanical properties of Examples 1 to 3 are higher than those of Comparative Example 1, and the antibacterial and corrosion-resistant properties are stronger.

[0182] It can be understood that the above embodiments can be implemented in combination or separately.

[0183] Obviously, the embodiments described above are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, those skilled in the art may make other different forms of changes or modifications without making any creative work, and all of these should fall within the scope of protection of the present invention.

Claims

1. A grinding cutter disc, characterized in that: include: A base, the base is arranged in an annular shape axially extending in a first direction, and has a channel axially penetrating the base, and a body arranged around the outer periphery of the channel, the body having a first side and a second side arranged opposite to each other, and the first side and the second side are arranged in sequence along the first direction; a grinding tooth group, provided on the body, comprising a plurality of grinding teeth distributed circumferentially on the first side; and The spur group is arranged on the body and comprises a plurality of spurs distributed at intervals in the circumferential direction of the body. The spur group is arranged close to the channel relative to the grinding tooth group in the radial direction.

2. The grinding blade according to claim 1, characterized in that: The inner circumferential wall of the main body has a plurality of front side areas, each of which is located one by one on the front side of each of the protrusions in the rotation direction in the circumferential direction. In the projection of the base along the first direction, each of the front side areas is recessed toward the outer circumference relative to the corresponding protrusions so that each of the protrusions extends forward into the channel.

3. The grinding blade according to claim 1, characterized in that: The plurality of grinding teeth include a plurality of first blade portions extending outward from the inner circumference of the body, and the spurs are formed at the inner ends of the first blade portions in a one-to-one correspondence.

4. The grinding blade according to claim 3, characterized in that: The area of ​​the first side between each two adjacent first blade portions is at least partially recessed toward the second side to form a plurality of first tooth grooves, and the plurality of first tooth grooves and the plurality of first blade portions are alternately arranged in the circumferential direction, and each of the first tooth grooves respectively penetrates the inner circumferential wall of the body to form a plurality of incisions on the inner circumferential wall, and the plurality of incisions and the plurality of protrusions are alternately distributed in the circumferential direction so that each of the protrusions is located at the edge where the inner circumferential wall intersects with the first side.

5. The grinding blade according to claim 4, characterized in that: Each of the incisions has a first edge extending from the first cutting edge portion to the bottom of the previous first tooth groove in the circumferential direction, and a second edge extending from the first cutting edge portion to the bottom of the next first tooth groove in the circumferential direction, the first edge having a circumferential size smaller than the second edge, and each of the first cutting edges intersects with the corresponding second edge and the first edge to form a corresponding spur.

6. The grinding blade according to claim 5, characterized in that: The cutting inclination angle of each of the first edges is less than 90 degrees, and the cutting inclination angle is the angle between the front side of the first edge and a reference plane measured in the assumed cross-sectional projection view corresponding to the first edge; In which, the grinding cutter disc has a rotation axis extending axially, the assumed sectional projection image corresponding to the first edge is the projection of the grinding cutter disc on the assumed cutting plane, the assumed cutting plane is coplanar with the rotation axis, and in the corresponding assumed sectional projection image, the rotation axis passes through the protrusion on the first edge, and the reference plane is a plane that is orthogonal to the rotation axis and passes through the protrusion.

7. The grinding blade according to claim 6, characterized in that: The cutting inclination angle is greater than or equal to 85 degrees and less than or equal to 87 degrees.

8. The grinding blade according to any one of claims 1 to 7, characterized in that: The inner peripheral wall of the body is inclined from inside to outside along the first direction.

9. The grinding blade according to claim 8, characterized in that: An included angle between the inner peripheral wall and the first direction is greater than or equal to 4 degrees and less than or equal to 10 degrees.

10. The grinding blade according to claim 3, characterized in that: Each of the first blade portions includes at least three blade segments which are sequentially connected from the inside to the outside and extend in a direction away from the first side in the axial direction.

11. The grinding blade according to claim 10, characterized in that: In the extension direction of the first blade portion, an angle is formed between each two adjacent blade segments, and the angles of the plurality of angles decrease in sequence from the inside to the outside.

12. The grinding blade according to claim 3, characterized in that: The plurality of grinding teeth also include a plurality of second blade portions extending inward from the outer circumference of the body, and the first side is at least partially recessed toward the second side in an area between each adjacent two second blade portions to form a plurality of second tooth grooves alternately arranged in the circumferential direction with the plurality of second blade portions.

13. The grinding blade according to claim 12, characterized in that: Each of the second tooth grooves penetrates the outer peripheral wall of the body to form a notch on the outer peripheral wall, and the axial size of the notch is greater than or equal to 0.1 mm and less than or equal to 0.3 mm; and / or, The number ratio of the first cutting edge portions to the second cutting edge portions is greater than or equal to 1 / 8 and less than or equal to 1 / 5.

14. The grinding blade according to claim 1, characterized in that: The grinding blade disc is integrally formed and made of ceramic.

15. 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 first 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 14.

16. A beverage preparation device, characterized in that: Comprising the grinding device as claimed in claim 15.

17. A grinding cutter disc, characterized in that: include: A base, the base is arranged in an annular shape to have a channel penetrating the base in the axial direction, and a body arranged in an annular manner on the outer periphery of the channel, the body having a first side and a second side arranged opposite to each other in the axial direction, the outer peripheral wall of the body including a first outer peripheral surface and a second outer peripheral surface, the first outer peripheral surface is adjacent to the first side, the second outer peripheral surface extends from the end side of the first outer peripheral surface away from the first side to the second side, and the first outer peripheral surface is recessed toward the inner periphery of the body relative to the second outer peripheral surface; and, The grinding tooth group is arranged on the first side.

18. The grinding blade according to claim 17, characterized in that: The first outer peripheral surface is inclined toward the inner periphery of the body in a direction extending from the second outer peripheral surface toward the first side.

19. The grinding blade according to claim 18, characterized in that: In a radial cross section of the grinding disc, an angle a between the first outer peripheral surface and the axial direction is greater than 0 degrees and less than 10 degrees.

20. The grinding blade according to claim 17, characterized in that: The first outer peripheral surface has a smaller radial dimension than the second outer peripheral surface, so that a step portion is formed between the first outer peripheral surface and the second outer peripheral surface.

21. The grinding blade according to claim 20, characterized in that: A radial dimension s of the step portion is greater than or equal to 0.15 mm and less than or equal to 0.25 mm.

22. The grinding blade according to any one of claims 17 to 21, characterized in that The dimension of the first outer peripheral surface in the axial direction is H1, the dimension of the outer peripheral wall in the axial direction is H, and H1 / H is greater than or equal to 1 / 3 and less than or equal to 2 / 3.

23. The grinding blade according to any one of claims 17 to 21, characterized in that The second outer peripheral surface extends from an end side of the first outer peripheral surface away from the first side to the second side.

24. A grinding device, characterized in that: include: case; A first cutter disc is installed in the housing; a second cutter disc installed in the housing, the second cutter disc being coaxial with the first cutter disc and rotatable relative to the first cutter disc, and a grinding gap being formed between the first cutter disc and the second cutter disc; as well as, a scraper, located at the outer periphery of the first blade disc and / or the second blade disc, and movably arranged relative to at least one of the first blade disc and the second blade disc, and the scraper is spaced apart from the relatively movable first blade disc and / or the second blade disc; Wherein, the first cutter disc and / or the second cutter disc that moves relatively with the scraper member is a grinding cutter disc as described in any one of claims 17 to 23; or, the first cutter disc and the second cutter disc are both grinding cutter discs as described in any one of claims 17 to 23.

25. The grinding device according to claim 24, characterized in that The first cutter disc and the second cutter disc are both grinding cutter discs as described in any one of claims 17 to 23, the grinding gap has a discharge opening connecting the outer peripheries of the first cutter disc and the second cutter disc, the first outer peripheral surface of the first cutter disc and the second outer peripheral surface of the second cutter disc are respectively arranged on both sides of the discharge opening in the axial direction to define an annular groove located on the outer peripheries of the first cutter disc and the second cutter disc, the discharge opening is located at the bottom of the annular groove, the first outer peripheral surface and the second outer peripheral surface on the first cutter disc are adjacent to each other to form a first edge defining the annular groove, and the first outer peripheral surface and the second outer peripheral surface on the second cutter disc are adjacent to each other to form a second edge defining the annular groove; The scraper is fixedly mounted on the second blade disc or integrally formed on the outer circumference of the second blade disc, and is rotatably arranged with the second blade disc relative to the first blade disc. The scraper has a fixed end fixed to the second blade disc and a free end relatively close to the first blade disc in the axial direction. The free end has a gap with the first blade disc in the radial direction, and is located between the first edge and the second side of the first blade disc in the axial direction.

26. The grinding device according to claim 25, characterized in that The first outer peripheral surface and the second outer peripheral surface are connected at the first edge by an arc chamfer; and / or, The end surface of the free end is inclined from the inside to the outside in a direction away from the second cutter disc.

27. The grinding device according to claim 25, characterized in that The scraper member has an inner side wall radially facing the first blade disc or the second blade disc, the inner side wall is radially spaced apart from the outer periphery of the first blade disc, a step surface facing the free end is formed on the inner side wall, and the step surface is radially located between the first side of the second blade disc and the second edge.

28. The grinding device according to claim 27, characterized in that The inner side wall has a side wall section extending from the step surface toward the fixed end, and the side wall section is disposed in close contact with the second outer peripheral surface of the second cutter disc.

29. The grinding device according to any one of claims 25 to 28, characterized in that The second blade disc is rotatably arranged in the shell relative to the shell, the scraper has an outer wall radially facing the shell, the outer wall and the inner wall of the shell are radially spaced apart, and a flexible scraper is provided at the outer end of the scraper, and the flexible scraper is used to contact the inner wall during the rotation of the scraper relative to the shell.

30. The grinding device according to any one of claims 24 to 28, characterized in that There are a plurality of scraping members, and the plurality of scraping members are distributed at intervals along the circumferential direction.

31. A beverage preparation device, characterized in that: Comprising a grinding device as claimed in any one of claims 17-30.

32. A method for preparing a grinding disc, characterized in that: The steps include: Aluminum oxide powder is added to ethanol, ground, mixed, dried, and sieved to obtain a first powder; The first powder is mixed with a binder, kneaded, and granulated to obtain an injection molding feedstock; Injection molding the injection molding feedstock to obtain a ceramic body; Degreasing the injection-molded ceramic body to obtain a ceramic blank; The ceramic blank is sintered at a first preset temperature and machined to form a finished ceramic tool.

33. The method for preparing the grinding blade disc according to claim 32, characterized in that: The adhesive includes polyvinyl alcohol, polyethylene glycol, and sodium carboxymethyl cellulose; The content ratio of polyvinyl alcohol, polyethylene glycol and sodium carboxymethyl cellulose is (3.1-3.5): (5.8-5.9):

1.

34. The method for preparing the grinding blade disc according to claim 32, characterized in that: The step of injection molding the injection molding feedstock to obtain a ceramic body comprises: Placing the injection molding feed in an injection molding machine and heating the injection molding feed to transform it into a viscous melt; The viscous melt injection feed is injected into a metal mold, cooled and demolded to obtain a ceramic body.

35. The method for preparing the grinding blade disc according to claim 34, characterized in that: The injection molding feed is placed in an injection molding machine and heated to transform the injection molding feed into a viscous melt, wherein the injection molding feed in the viscous melt is less than 80 Pa·s.

36. The method for preparing a grinding blade according to claim 34, wherein: The injection molding feed is placed in an injection molding machine and heated to transform the injection molding feed into a viscous melt. The heating temperature is 95° C.-115° C., and the mixing speed during heating is 400 r / min-500 r / min.

37. The method for preparing a grinding blade according to claim 34, wherein: The step of injecting the injection molding feed material in the form of a viscous melt into a metal mold, cooling and demoulding to obtain a ceramic body comprises: The injection molding feed in the form of a viscous melt is injected into a metal mold at a second preset temperature and a preset pressure, and then cooled and demolded to obtain a ceramic body, wherein the second preset temperature is 260° C.-270° C.; and / or the preset pressure is 100 MPa-110 MPa.

38. The method for preparing a grinding blade according to claim 32, wherein: In the step of degreasing the injection-molded ceramic body to obtain a ceramic blank, the degreasing temperature ranges from 40°C to 50°C.

39. The method for preparing a grinding blade according to claim 32, wherein: In the step of sintering the ceramic blank at a first preset temperature and machining to form a finished ceramic tool, the first preset temperature is 1300°C to 1800°C.

40. The method for preparing a grinding blade according to claim 32, wherein: The aluminum oxide powder is added to ethanol, ground, mixed, dried, and sieved to obtain the first powder, and the particle size of the aluminum oxide powder is 0.5 μm to 3 μm.

41. A grinding cutter disc, characterized in that: The grinding cutter disc is prepared using the grinding cutter disc preparation method described in any one of claims 32 to 40.

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