A bean grinder and coffee maker

Abstract

The application discloses a coffee grinder and a coffee machine. The coffee grinder comprises a shell with a containing cavity; a movable grinding wheel is arranged in the containing cavity; a grinding disc is sleeved on the movable grinding wheel, and a grinding gap is formed between the movable grinding wheel and the grinding disc; an outer ring is threadedly connected with the shell; a fixing assembly is arranged between the grinding disc and the outer ring; and an axial guide assembly is arranged in the containing cavity, and the grinding disc is connected with the axial guide assembly. In the application, the movement track of the grinding disc is constrained by the axial guide assembly, so that the grinding disc only moves axially when the outer ring rotates, the axis before and after adjustment is kept consistent, the pressure distribution of the grinding surface is uniform, the pre-tightening force which is away from the grinding disc is provided for the outer ring by the fixing assembly, the outer ring is prevented from acting on the grinding disc due to the vibration in the grinding process or the reaction force of the material, the stability of the grinding gap is maintained, the coffee powder with uniform fineness is ensured, the extraction flavor is balanced and stable, and the use experience of consumers is improved.

Description

Technical Field

[0001] This application relates to the field of household appliance technology, and more particularly to a coffee grinder and coffee machine. Background Technology

[0002] A coffee machine's grinding mechanism grinds coffee beans into the powder needed for brewing. This grinding mechanism typically includes an adjustment mechanism that controls the coarseness of the coffee powder by changing the gap between the moving and stationary grinding wheels. Existing grinding mechanisms, as shown in patent (CN222149835U), use an outer retaining ring to drive the stationary grinding wheel axially to adjust the gap. However, this technical solution suffers from a serious flaw: uncontrolled grinding precision.

[0003] Specifically, existing devices rely on a threaded structure to move the stationary grinding wheel up and down. However, due to the characteristics of the threaded structure, the stationary grinding wheel is prone to axial misalignment during movement, resulting in eccentric contact between the moving grinding wheel and the stationary grinding wheel. This misalignment directly causes an imbalance in the pressure distribution on the grinding surface—excessive grinding in local high-pressure areas produces fine powder, while low-pressure areas retain coarse particles due to insufficient contact, resulting in coffee powder of varying coarseness produced at the same time.

[0004] More seriously, the pressure imbalance caused by eccentricity will aggravate the high-frequency vibration during the grinding process. Combined with the reaction force of coffee bean breakage, this will cause the outer ring to shift during the grinding process, which will lead to the continuous expansion of the grinding gap during the grinding process. This will cause the particle size of the same batch of coffee powder to fluctuate at different times, resulting in a complete loss of control over the uniformity of coffee powder particles. During extraction, fine powder will block the water flow and cause over-extraction and bitterness, while coarse powder will form a channel effect and cause under-extraction and a weak taste. The flavor balance of the coffee will be completely destroyed, giving consumers a very poor user experience. Utility Model Content

[0005] To overcome at least one of the defects described in the prior art, this application provides a coffee grinding device that ensures uniform coffee powder size, balanced and stable extraction flavor, and improves the user experience.

[0006] A coffee grinding device according to an embodiment of this application includes: a housing having a receiving cavity; a movable grinding wheel assembled in the receiving cavity; a grinding disc sleeved on the movable grinding wheel, with a grinding gap formed between the movable grinding wheel and the grinding disc; an outer retaining ring threadedly connected to the housing; a fixing component disposed between the grinding disc and the outer retaining ring, for providing a preload force to the outer retaining ring away from the grinding disc; and an axial guide component disposed in the receiving cavity, the grinding disc being connected to the axial guide component, and the axial guide component driving the grinding disc to move axially when the outer retaining ring rotates.

[0007] In this coffee grinding device, the axial guide assembly constrains the movement trajectory of the grinding disc, ensuring that the grinding disc only moves axially when the outer retaining ring rotates. This eliminates radial degrees of freedom and prevents the grinding disc from tilting due to the lateral force of the outer retaining ring during threaded adjustment. It ensures that the axis remains consistent before and after adjustment, resulting in uniform pressure distribution on the grinding surface. Furthermore, the fixing assembly provides a pre-tightening force to the outer retaining ring away from the grinding disc, preventing the outer retaining ring from acting on the grinding disc due to vibrations during grinding or the reaction force of the material. This avoids the outer retaining ring driving the grinding disc during grinding, effectively maintaining the stability of the grinding gap. This multi-dimensional combination of protection ensures uniform coffee powder coarseness, balanced and stable extraction flavor, and improved user experience.

[0008] According to some embodiments of this application, a grinding body is assembled in the receiving cavity. The grinding body has a through shaft hole in the middle, and a drive shaft is assembled in the shaft hole. The moving grinding wheel is fixed to the drive shaft. The grinding disc is connected to the grinding body through at least two sets of axial guide components.

[0009] According to some embodiments of this application, the grinding disc includes a grinding part and an assembly part. The grinding part is sleeved on the moving grinding wheel, and the assembly part is disposed on the outside of the grinding part. A first elastic element is disposed between the grinding body and the assembly part.

[0010] According to some embodiments of this application, the grinding body is provided with a first slot corresponding to the first elastic element, and the assembly part is provided with a second slot corresponding to the first elastic element, with the first slot and the second slot being disposed opposite to each other.

[0011] According to some embodiments of this application, the axial guide assembly includes a main body slot and a blade insert post. The main body slot is disposed on the side of the grinding body facing the grinding blade, and the blade insert post is disposed on the side of the grinding blade facing the grinding body. The blade insert post is inserted into the main body slot.

[0012] According to some embodiments of this application, an elastic lever is provided on the side of the outer retaining ring facing the grinding disc; a plurality of gear slots are arranged circumferentially on the side of the grinding disc facing the outer retaining ring, the gear slots abut against the elastic lever, and the rotation of the outer retaining ring will drive the elastic lever to move between the adjacent gear slots to provide tactile and / or auditory feedback.

[0013] According to some embodiments of this application, the fixing component includes a metal retaining ring, which is fixed to the side of the grinding disc facing the outer retaining ring, and the side of the outer retaining ring facing the grinding disc abuts against the metal retaining ring.

[0014] According to some embodiments of this application, a powder scraping assembly is also included, the powder scraping assembly comprising: a fixed disk fixedly connected to the movable grinding wheel; a fixed ring fixedly connected to the side of the fixed disk opposite to the movable grinding wheel; a powder scraper movably sleeved on the fixed disk and abutting against the powder outlet side of the grinding disc; and a second elastic member abutting against the fixed ring and the powder scraper; when the grinding disc moves axially, the second elastic member undergoes elastic deformation, so that the powder scraper always abuts against the powder outlet side of the grinding disc.

[0015] According to some embodiments of this application, a powder collecting ring is also included, which is fixedly connected to the outer retaining ring, and the powder outlet side of the grinding disc is in communication with the powder collecting ring.

[0016] Based on the same inventive concept, this application also proposes a coffee machine, including: the bean grinding device as described above.

[0017] In summary, the coffee grinding device provided in this application has the following technical advantages:

[0018] The axial guide assembly constrains the movement trajectory of the grinding disc, ensuring that it moves only axially when the outer retaining ring rotates. This eliminates radial degrees of freedom and prevents the grinding disc from tilting due to lateral forces from the outer retaining ring during threaded adjustment. It ensures the axis remains consistent before and after adjustment, resulting in uniform pressure distribution on the grinding surface. Furthermore, the fixing assembly provides a pre-tightening force to the outer retaining ring away from the grinding disc, preventing it from being affected by vibrations or material reaction forces during grinding and thus avoiding the outer retaining ring driving the grinding disc. This effectively maintains the stability of the grinding gap, achieving multi-dimensional combined protection. Ultimately, this ensures uniform coffee powder coarseness, balanced and stable extraction flavor, and improved user experience. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the bean grinding device according to Embodiment 1 of this application;

[0020] Figure 2 This is a cross-sectional view of the bean grinding device according to Embodiment 1 of this application;

[0021] Figure 3 This is an assembly diagram of the fixing component according to Embodiment 1 of this application;

[0022] Figure 4 This is a schematic diagram of the main body of the bean grinder according to Embodiment 2 of this application;

[0023] Figure 5 This is a schematic diagram of the grinding disc in Embodiment 2 of this application;

[0024] Figure 6 This is a schematic diagram of the grinding disc in Embodiment 3 of this application;

[0025] Figure 7 This is a schematic diagram of the structure of the outer retaining ring in Embodiment 3 of this application;

[0026] Figure 8 This is a schematic diagram of the bean grinding device according to Embodiment 4 of this application;

[0027] Figure 9 This is a schematic diagram of the grinding disc in Embodiment 4 of this application;

[0028] Figure 10 This is a schematic diagram of the structure of the outer retaining ring in Embodiment 4 of this application;

[0029] Figure 11 This is a schematic diagram of the bean grinding device according to Embodiment 5 of this application;

[0030] Figure 12 This is a cross-sectional view of the bean grinding device according to Embodiment 5 of this application;

[0031] Figure 13 This is an assembly diagram of the powder scraping assembly according to Embodiment 5 of this application;

[0032] Figure 14 This is a schematic diagram of the structure of the fixing ring in Embodiment 5 of this application.

[0033] The meanings of the reference numerals in the attached figures are as follows:

[0034] 1. Outer shell; 11. Receiving cavity; 12. Grinding body; 13. Drive shaft; 2. Moving grinding wheel; 3. Grinding disc; 31. Grinding part; 32. Assembly part; 33. First elastic element; 331. First spring; 34. First slot; 35. Second slot; 4. Outer retaining ring; 41. Elastic lever; 411. Second spring; 412. Lever; 413. Groove; 42. Gear slot; 5. Fixing assembly; 51. Metal fixing ring; 52. Fixing post; 53. Abutment part; 6. Axial guide assembly; 61. Body locking position; 62. Disc insertion post; 63. Disc limiter; 7. Powder scraping assembly; 71. Fixing disc; 72. Fixing ring; 73. Powder scraper; 74. Second elastic element; 75. Third slot; 76. Protrusion; 77. Guide channel; 8. Powder collecting ring. Detailed Implementation

[0035] To better understand and implement this application, the technical solutions in this application will be clearly and completely described below with reference to the accompanying drawings.

[0036] In the description of this application, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application.

[0038] Example 1:

[0039] See Figure 1 , Figure 2 and Figure 3 This embodiment discloses a coffee grinding device. The coffee grinding device includes a housing 1, a movable grinding wheel 2, a grinding disc 3, an outer retaining ring 4, a fixing component 5, and an axial guide component 6; preferably, the housing 1 has a receiving cavity 11; the movable grinding wheel 2 is assembled in the receiving cavity 11; the grinding disc 3 is sleeved on the movable grinding wheel 2, and a grinding gap is formed between the movable grinding wheel 2 and the grinding disc 3; the outer retaining ring 4 is threadedly connected to the housing 1; the fixing component 5 is disposed between the grinding disc 3 and the outer retaining ring 4, and is used to provide a pre-tightening force to the outer retaining ring 4 away from the grinding disc 3; the axial guide component 6 is disposed in the receiving cavity 11, the grinding disc 3 is connected to the axial guide component 6, and when the outer retaining ring 4 rotates, the axial guide component 6 drives the grinding disc 3 to move axially. In this embodiment, the axial guide component 6 constrains the movement trajectory of the grinding disc 3, ensuring that the grinding disc 3 only moves axially when the outer retaining ring 4 rotates. This eliminates radial degrees of freedom and prevents the grinding disc 3 from tilting due to the lateral force of the outer retaining ring 4 during thread adjustment. This ensures that the axis remains consistent before and after adjustment, resulting in uniform pressure distribution on the grinding surface. Furthermore, the fixing component 5 provides a pre-tightening force to the outer retaining ring 4 away from the grinding disc 3, preventing the outer retaining ring 4 from acting on the grinding disc 3 due to vibrations during the grinding process or the reaction force of the material. This avoids the outer retaining ring 4 driving the grinding disc 3 during the grinding process, effectively maintaining the stability of the grinding gap and achieving multi-dimensional combined protection. This ensures that the ground coffee powder is of uniform coarseness, the extracted flavor is balanced and stable, and the consumer experience is improved.

[0040] Optionally, the axes of the outer casing 1, the moving grinding wheel 2, and the grinding blade are collinear; optionally, the axial direction is aligned with the height direction, so that the axial guide assembly 6 limits the vertical movement of the grinding blade disc 3 when the outer retaining ring 4 rotates. Optionally, the grinding blade disc 3 has a vertically penetrating grinding cavity, through which the grinding blade disc 3 is fitted onto the moving grinding wheel 2. Coffee beans fall into the grinding cavity of the grinding blade disc 3 and, under the combined action of gravity and the centrifugal force of the rotating moving grinding wheel 2, are evenly ground in the grinding gap formed between the grinding blade disc 3 and the moving grinding wheel 2. Optionally, the axial guide assembly 6 can be a guide rod, guide rail, or slide groove, etc., extending axially, to guide and constrain the grinding blade disc 3 to move only axially when the outer retaining ring 4 rotates; optionally, the fixing assembly 5 can be an elastic element, rigid element, or damping element that abuts against / is fixed to the outer retaining ring 4 to provide a preload force to the outer retaining ring 4 away from the grinding blade disc 3.

[0041] In this embodiment, before the grinding operation, the outer retaining ring 4, which is threaded to the outer casing 1, moves up and down during rotation, causing the grinding disc 3 to move up and down relative to the moving grinding wheel 2 to adjust the grinding gap. Preferably, during the up and down movement of the grinding disc 3, the axial guide component 6 constrains the grinding disc 3 to only move up and down, preventing the outer retaining ring 4 from tilting due to the lateral force during threaded adjustment. This ensures that the axis remains consistent before and after adjustment, resulting in uniform pressure distribution on the grinding surface and achieving grinding assurance in the spatial dimension. This ensures that the coffee powder particles ground in each area of ​​the grinding gap are of uniform size. During the grinding operation, the fixing component 5 provides a pre-tightening force to the outer retaining ring 4 away from the grinding disc 3, preventing the outer retaining ring 4 from being affected by vibrations or material reaction forces during the grinding process and thus acting on the grinding disc 3. This avoids the outer retaining ring 4 driving the grinding disc 3 during the grinding process, effectively maintaining the stability of the grinding gap and achieving grinding assurance in the temporal dimension. This ensures that the particle size of the same batch of coffee powder is uniform at different times, ultimately ensuring a balanced and stable flavor.

[0042] Example 2:

[0043] See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5This embodiment also discloses a coffee grinding device. The main difference between the coffee grinding device in this embodiment and the above-mentioned embodiments is that: a coffee grinding body 12 is assembled in the receiving cavity 11, and a shaft hole is provided in the middle of the coffee grinding body 12, through which a drive shaft 13 is assembled, and the moving grinding wheel 2 is fixed to the drive shaft 13; the grinding disc 3 and the coffee grinding body 12 are connected by at least two sets of axial guide components 6. Preferably, the two sets of axial guide components 6 are arranged at intervals along the circumference of the grinding disc 3, so that the grinding disc 3 is subjected to uniform force when moving axially, avoiding structural deformation caused by force concentration on one side of the axial guide component 6. At the same time, the lateral component force of the outer retaining ring 4 when adjusted by the thread is synchronously canceled by the two sets of axial guide components 6, preventing the grinding disc 3 from axially offset due to asymmetrical load. Optionally, the axes of the outer shell 1, the moving grinding wheel 2, the drive shaft 13 and the grinding blade are collinear.

[0044] See Figure 4 and Figure 5 Preferably, the axial guide assembly 6 includes a main body retainer 61 and a blade insert post 62. The main body retainer 61 is located on the side of the grinding body 12 facing the grinding blade 3, and the blade insert post 62 is located on the side of the grinding blade 3 facing the grinding body 12. The blade insert post 62 is inserted into the main body retainer 61. It should be noted that the blade insert post 62 corresponds one-to-one with the main body retainer 61, ensuring that the grinding blade 3 is subjected to uniform force during axial movement and can always maintain concentricity with the moving grinding wheel 2. By rotating the outer retaining ring 4, which is threadedly connected to the outer casing 1, the grinding gap between the grinding blade 3 and the moving grinding wheel 2 can be precisely controlled. This effectively avoids the problem of misalignment between the grinding blade 3 and the moving grinding wheel 2 that may occur in traditional spiral lifting mechanisms, ensuring uniform pressure distribution on the grinding surface and achieving grinding assurance in the spatial dimension. This ensures that the coffee powder particles ground in each area of ​​the grinding gap are of uniform size.

[0045] Furthermore, the cutter head insertion post 62 can be cylindrical or prismatic. In this embodiment, there are multiple sets of axial guide components 6, which are spaced apart along the circumference of the grinding cutter head 3. Optionally, the axial guide component 6 may have both cylindrical and prismatic cutter head insertion posts 62, which are staggered along the circumference of the grinding cutter head 3. Correspondingly, the main body locking position 61 includes a main body locking position 61 with a circular hole and a main body locking position 61 with a square hole. The main body locking position 61 with the circular hole is inserted into the cylindrical cutter head insertion post 62, and the main body locking position 61 with the square hole is inserted into the cylindrical cutter head insertion post 62. 1 is inserted into the prism-shaped cutter head insertion post 62. In this way, a hybrid constraint is formed by the cylindrical and prism-shaped structures. The line contact of the cylindrical structure and the surface contact of the prism-shaped structure have different wear modes. The staggered layout avoids premature failure of a single contact form and extends the life of the axial guide component 6. At the same time, the cylindrical structure can provide flexible tolerance, while the prism-shaped structure provides rigid guidance. The two complement each other to avoid jamming or stress concentration caused by "over-constraint". It also ensures the consistency of the axis under dynamic adjustment. Furthermore, the arc surface of the cylindrical structure can attenuate high-frequency vibration energy, and the planar locking of the prism-shaped structure can suppress low-frequency displacement, forming a broadband anti-vibration barrier and further improving the vibration resistance and stability of the grinding device.

[0046] See Figure 2 Furthermore, in order to ensure the safe use of the grinding disc 3, a disc limiter 63 is provided between at least two adjacent main body slots 61. The disc limiter 63 is used to limit the maximum spacing of the grinding gap. The design of the disc limiter 63 ensures that the grinding disc 3 will not cause the grinding gap to be too large due to excessive movement during the displacement process, resulting in larger particles. It can also prevent structural damage or wear caused by excessive movement.

[0047] Example 3:

[0048] See Figure 1 and Figure 2This embodiment also discloses a coffee grinding device. The main difference between the coffee grinding device in this embodiment and the above embodiment is that the fixing component 5 includes a metal fixing ring 51, which is fixed to the side of the grinding disc 3 facing the outer retaining ring 4, and the side of the outer retaining ring 4 facing the grinding disc 3 abuts against the metal fixing ring 51. Preferably, the metal retaining ring 51, made of metal, has high rigidity, which blocks the transmission of working vibration of the grinding disc 3 and can form a closed path of "metal retaining ring 51-outer retaining ring 4-grinding disc 3-metal retaining ring 51". The metal retaining ring 51 provides a pre-tightening force away from the grinding disc 3 to the outer retaining ring 44, preventing the outer retaining ring 4 from being affected by the vibration of the grinding process or the reaction force of the material and thus preventing the outer retaining ring 4 from driving the grinding disc 3 to move relative to the grinding disc 3. This ensures that the grinding disc 3 is stably maintained in the corresponding position, so that the metal retaining ring 51 fixed to the lower end of the grinding disc 3 can continuously provide a pre-tightening force away from the grinding disc 3 to the outer retaining ring 4.

[0049] See Figure 6 and Figure 7 Optionally, a fixing post 52 is provided at the lower end of the grinding disc 3, and a metal fixing ring 51 is fixed to the fixing post 52. Optionally, the fixing can be a snap-fit ​​connection, bolt connection, threaded connection, etc. Preferably, a screw hole is provided on the fixing post 52, and the metal fixing ring 51 is assembled to the lower end of the grinding disc 3 by bolts / screws or other fasteners, so that the grinding disc 3 and the metal fixing ring 51 are connected into a stable integral structure. Optionally, an abutment part 53 is provided on the inner wall of the outer retaining ring 4, and the abutment part 53 abuts against the metal fixing ring 51. Preferably, the abutment part 53 provided on the outer retaining ring 4 serves as the direct contact surface between the outer retaining ring 4 and the metal fixing ring 51, so that the preload applied by the metal fixing ring 51 is evenly transmitted to the overall structure of the outer retaining ring 4, ensuring uniform pressure distribution, avoiding deformation caused by local stress concentration, and comprehensively counteracting the tendency of the outer retaining ring 4 to shift due to vibration or the reaction force of the material during the grinding process. Optionally, the abutting part 53 is a top ring structure that is encircled on the inner wall of the outer retaining ring 4.

[0050] Example 4:

[0051] See Figure 5 and Figure 8This embodiment also discloses a bean grinding device. The main difference between the bean grinding device in this embodiment and the above embodiment is that: the grinding disc 3 includes a grinding part 31 and an assembly part 32, the grinding part 31 is sleeved on the moving grinding wheel 2, and the assembly part 32 is disposed on the outside of the grinding part 31; a first elastic member 33 is disposed between the bean grinding body 12 and the assembly part 32. Preferably, by placing the first elastic element 33 between the grinding body 12 and the assembly part 32, the assembly part 32 is driven to abut against the outer retaining ring 4, ensuring that the outer retaining ring 4 can drive the grinding disc 3 to move up and down. Specifically, when the outer retaining ring 4, which is threaded to the outer shell 1, is driven to move upward, the outer retaining ring 4 simultaneously pushes the grinding disc 3 to move upward, while compressing the first elastic element 33. When the outer retaining ring 4, which is threaded to the outer shell 1, is driven to move downward, the first elastic element 33 pushes the grinding disc 3 to move downward, so that the grinding disc 3 and the outer retaining ring 4 always remain in abutment, enabling the outer retaining ring 4 to drive the grinding disc 3 to move up and down. At the same time, since the first elastic element 33 is placed between the grinding body 12 and the assembly part 32, the first elastic element 33 is isolated in the grinding chamber, preventing coffee beans from being stuck by the spiral gap of the spring during the grinding process and interrupting the feeding. This completely avoids the phenomenon of spring-stuck beans in traditional solutions, and constructs a spring-free anti-stuck bean grinding system.

[0052] See Figure 2 , Figure 4 and Figure 5 Preferably, the grinding body 12 is provided with a first groove 34 corresponding to the first elastic element 33, and the assembly part 32 is provided with a second groove 35 corresponding to the first elastic element 33. The first groove 34 and the second groove 35 are arranged opposite to each other. Preferably, the first elastic element 33 is fixed by the first groove 34 and the second groove 35 arranged opposite to each other, so that both ends of the first elastic element 33 are fixed at the same time, preventing the first elastic element 33 from deviating under force, and ensuring that the first elastic element 33 can continuously apply axial force to the assembly part 32, so that the assembly part 32 always stably abuts against the outer retaining ring 4. In this way, when rotating the outer retaining ring 4 connected to the outer shell 1 by the thread, the grinding disc 3 can be effectively driven to move up and down to adjust the grinding gap.

[0053] See Figure 1 , Figure 4 , Figure 5 and Figure 8Furthermore, the assembly part 32 is arranged around the outside of the grinding part 31. The first elastic element 33 includes a plurality of first springs 331, which are arranged at intervals along the circumference. This allows the first elastic element 33 to apply preload to the grinding disc 3 evenly, thereby applying preload at multiple points and avoiding uneven force distribution at a single point. This ensures that the assembly part 32 of the grinding disc 3 is tightly attached to the outer retaining ring 4. In this way, when the outer retaining ring 4 is rotated, the grinding disc 3 can be effectively driven to move up and down synchronously, preventing lag in the movement of the grinding disc 3 and making the adjustment more precise.

[0054] See Figure 8 , Figure 9 and Figure 10 Furthermore, a flexible lever 41 is provided on the side of the outer retaining ring 4 facing the grinding disc 3; several gear slots 42 are arranged circumferentially on the side of the grinding disc 3 facing the outer retaining ring 4. The gear slots 42 abut against the flexible lever 41, and the rotation of the outer retaining ring 4 will drive the flexible lever 41 to move between adjacent gear slots 42 to provide tactile and / or auditory feedback. Preferably, the flexible lever 41 moves between adjacent gear slots 42 and abuts against the gear slots 42 as the outer retaining ring 4 rotates to provide tactile and / or auditory feedback to the user, such as a noticeable click or change in resistance, so that the user can clearly perceive the change when the outer retaining ring rotates one gear. This instant feedback enhances the user's sense of control and accuracy of operation, making the adjustment of the grinding gap more intuitive and easier. Optionally, the elastic lever 41 includes a second spring 411 and a lever 412. The second spring 411 is disposed in a groove 413 on the side of the outer retaining ring facing the grinding disc 3. One end of the lever 412 is fixed to the second spring 411, and the other end abuts against the gear slot 42. In this embodiment, as the outer retaining ring rotates, the elastic lever 41 alternately abuts against different gear slots 42, generating obvious tactile feedback. Whenever the lever 412 moves from one gear slot 42 to the next, the user can feel a clear click or change in resistance, thus clearly knowing the current gear position. This greatly improves the accuracy of the user in adjusting the grinding gap. The user does not need to rely on visual confirmation; they can accurately find and position the required grinding gear solely by touch, making operation more convenient and efficient. When the outer retaining ring rotates, the lever 412 moves with the change of the slot. Due to the elastic force of the second spring 411, the lever 412 will generate obvious changes in resistance or clicks during movement, providing the user with stable tactile feedback. This feedback allows users to clearly perceive the changes as the outer bezel rotates through each gear.

[0055] Example 5:

[0056] See Figure 11 , Figure 12 and Figure 13This embodiment also discloses a coffee grinding device. The main difference between the coffee grinding device in this embodiment and the above-mentioned embodiment is that it also includes a powder scraping assembly 7. The powder scraping assembly 7 includes: a fixed disk 71, fixedly connected to the moving grinding wheel 2; a fixed ring 72, fixedly connected to the side of the fixed disk 71 away from the moving grinding wheel 2; a powder scraper 73, movably sleeved on the fixed disk 71 and abutting against the powder outlet side of the grinding disc 3; and a second elastic member 74, abutting against the fixed ring 72 and the powder scraper 73. When the grinding disc 3 moves axially, the second elastic member 74 undergoes elastic deformation, so that the powder scraper 73 always abuts against the powder outlet side of the grinding disc 3. Specifically, when the grinding disc 3 moves upward, the scraper 73 moves synchronously under the elastic force of the second elastic element 74, ensuring that the scraper 73 remains in close contact with the powder outlet side of the grinding disc 3. When the grinding disc 3 moves downward, the powder outlet side of the grinding disc 3 pushes the scraper 73 downward, compressing the second elastic element 74. The scraper 73 moves downward accordingly, but still maintains contact with the powder outlet side of the grinding disc 3 under the action of the second elastic element 74. Thus, through the cooperation of the second elastic element 74 and the scraper 73, the scraper 73 can automatically adjust its position according to the movement of the grinding disc 3, always remaining in close contact with the powder outlet side of the grinding disc 3. This ensures that the scraper 73 scrapes away residual powder from the powder outlet side during the grinding process, avoiding the impact of residual powder on coffee quality. Furthermore, by avoiding the mixing of residual powder and expired coffee powder, the coffee powder extracted each time is fresh, thereby improving the extraction effect and taste of the coffee and providing users with higher quality coffee.

[0057] See Figure 11 and Figure 12 Optionally, a powder collecting ring 8 is also included. The powder collecting ring 8 is fixed to the outer retaining ring 4, and the powder outlet side of the grinding disc 3 is connected to the powder collecting ring 8. Specifically, by utilizing the connection between the powder collecting ring 8 and the powder outlet side of the grinding disc 3, the ground powder is effectively collected into the powder collecting ring 8 and discharged centrally by the powder collecting ring 8, avoiding disorderly powder splashing or residue, thereby improving powder collection efficiency. Furthermore, after grinding, the powder cleaning work is more centralized and convenient; only the powder collecting ring 8 needs to be cleaned, without the need for large-area cleaning, thus reducing cleaning difficulty and workload.

[0058] See Figure 11 and Figure 12Furthermore, the powder collecting ring 8 is positioned below the grinding disc 3, and the lower end of the powder scraper 73 extends into the powder collecting ring 8, so that the powder scraper 73 simultaneously abuts against the inner wall of the powder collecting ring 8 and the powder outlet side of the grinding disc 3. When the outer baffle moves the grinding disc 3 upward synchronously, the powder collecting ring 8 also moves upward, and the second elastic member 74 is used to elastically drive the powder scraper 73 to move upward, so that the powder scraper 73 remains in contact with the inner wall of the powder collecting ring 8 and the powder outlet side of the grinding disc 3. When the outer baffle moves the grinding disc 3 downward synchronously, the powder collecting ring 8 also moves downward, and the powder outlet side of the grinding disc 3 pushes the powder scraper 73 downward and compresses the second elastic member 74. In this way, the powder scraper 73 can still maintain contact with the inner wall of the powder collecting ring 8 and the powder outlet side of the grinding disc 3, realizing an all-round, no-dead-angle powder scraping function. It should be noted that during the grinding process, coffee powder easily adheres to the powder outlet side of the grinding disc 3 and the inner wall of the powder collection ring 8. If this residual powder is not removed in time, it will not only affect the quality of the subsequent coffee powder but may also cause blockage and wear inside the grinding assembly. In this embodiment, when the grinding disc 3 moves upward, the second elastic element 74 releases its elastic force to drive the powder scraper 73 to move upward, ensuring that the powder scraper 73 always maintains close contact with the inner wall of the powder collection ring 8 and the powder outlet side of the grinding disc 3, effectively scraping off the coffee powder adhering to them. When the grinding disc 3 moves downward, the powder outlet side of the grinding disc 3 pushes the powder scraper 73 downward, compressing the second elastic element 74. However, the powder scraper 73 can still maintain contact with both the inner wall of the powder collection ring 8 and the powder outlet side of the grinding disc 3 under the action of the elastic force, continuing to perform the powder scraping task. This adaptive scraping mechanism can adjust the position of the scraper 73 in real time according to the movement of the grinding disc 3, always maintaining a high-efficiency scraping effect, ensuring the smooth progress of the grinding process, while also extending the service life of the grinding components and reducing the difficulty and workload of cleaning the equipment.

[0059] See Figure 12 Furthermore, the scraper 73 is connected to the moving grinding wheel 2 via a fixed plate 71. Driven by the drive shaft 13, the scraper 73 rotates synchronously with the moving grinding wheel 2. Preferably, the lower end of the drive shaft 13 extends out of the moving grinding wheel 2 and is connected to the fixed plate 71. The lower end of the moving grinding wheel 2 is provided with a third slot 75, and the upper end of the fixed plate 71 is provided with a protrusion 76 that engages with the third slot 75. When assembling the fixed plate 71, the fixed plate 71 is fitted onto the drive shaft 13, and then the protrusion 76 is aligned with the third slot 75 and inserted. This ensures that the fixed plate 71 is accurately positioned on the moving grinding wheel 2. This precise positioning avoids the fixed plate 71 from shifting or tilting during installation, ensuring the concentricity between the fixed plate 71 and the moving grinding wheel 2, thereby improving the uniformity and stability of the scraping.

[0060] See Figure 14Furthermore, the fixing ring 72 is provided with a guide channel 77, and the powder scraper 73 and the guide channel 77 are slidably engaged. Under the constraint of the guide channel 77, the powder scraper 73 can only move up and down when the grinding disc 3 moves up and down, preventing the powder scraper 73 from shifting due to vibration, impact of hard objects, etc., thereby ensuring the uniformity and consistency of the powder scraping effect.

[0061] Example 6:

[0062] This embodiment describes a coffee machine. The coffee machine includes the bean grinding device of any of the above embodiments.

[0063] The technical means disclosed in this application are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make several improvements and modifications without departing from the principles of this application, and these improvements and modifications are also considered to be within the scope of protection of this application.

Claims

1. A coffee grinding device, characterized in that, include: The outer casing (1) has a receiving cavity (11); A movable grinding wheel (2) is assembled in the receiving cavity (11); A grinding disc (3) is sleeved on the moving grinding wheel (2), and a grinding gap is formed between the moving grinding wheel (2) and the grinding disc (3); Outer retaining ring (4), which is threadedly connected to the outer shell (1); A fixing component (5) is disposed between the grinding disc (3) and the outer retaining ring (4) for providing a preload force to the outer retaining ring (4) away from the grinding disc (3); An axial guide assembly (6) is disposed in the receiving cavity (11). The grinding disc (3) is connected to the axial guide assembly (6), and the axial guide assembly (6) drives the grinding disc (3) to move axially when the outer retaining ring (4) rotates.

2. The grinding device according to claim 1, characterized in that: The receiving cavity (11) is equipped with a bean grinding body (12), and the bean grinding body (12) has a shaft hole that runs vertically through the middle. The shaft hole is equipped with a drive shaft (13), and the moving grinding wheel (2) is fixed to the drive shaft (13). The grinding disc (3) is connected to the grinding body (12) by at least two sets of the axial guide components (6).

3. The grinding device according to claim 2, characterized in that: The grinding disc (3) includes a grinding part (31) and an assembly part (32). The grinding part (31) is sleeved on the moving grinding wheel (2), and the assembly part (32) is disposed on the outside of the grinding part (31). A first elastic element (33) is provided between the grinding body (12) and the assembly part (32).

4. The grinding device according to claim 3, characterized in that: The grinding body (12) is provided with a first slot (34) corresponding to the first elastic element (33), and the assembly part (32) is provided with a second slot (35) corresponding to the first elastic element (33). The first slot (34) and the second slot (35) are arranged opposite to each other.

5. The grinding device according to claim 2, characterized in that: The axial guide assembly (6) includes a main body locking position (61) and a blade insert post (62). The main body locking position (61) is located on the side of the grinding body (12) facing the grinding blade (3). The blade insert post (62) is located on the side of the grinding blade (3) facing the grinding body (12). The blade insert post (62) is inserted into the main body locking position (61).

6. The grinding device according to claim 1, characterized in that: The outer retaining ring (4) is provided with an elastic lever (41) on the side facing the grinding disc (3); The grinding disc (3) has a plurality of circumferentially arranged slots (42) on the side facing the outer retaining ring (4). The slots (42) abut against the elastic lever (41), and the rotation of the outer retaining ring (4) will drive the elastic lever (41) to move between the adjacent slots (42) to provide tactile and / or auditory feedback.

7. The coffee grinding device according to claim 1, characterized in that: The fixing component (5) includes a metal fixing ring (51), which is fixed to the side of the grinding disc (3) facing the outer retaining ring (4), and the side of the outer retaining ring (4) facing the grinding disc (3) abuts against the metal fixing ring (51).

8. The grinding device according to claim 1, characterized in that: It also includes a powder scraping assembly (7), which comprises: A fixed disk (71) is fixedly connected to the moving grinding wheel (2); A retaining ring (72) is fixed to the side of the retaining plate (71) away from the moving grinding wheel (2); The powder scraper (73) is movably sleeved on the fixed plate (71) and abuts against the powder outlet side of the grinding disc (3); The second elastic element (74) abuts against the fixed ring (72) and the powder scraper (73); when the grinding disc (3) moves axially, the second elastic element (74) undergoes elastic deformation, so that the powder scraper (73) always abuts against the powder outlet side of the grinding disc (3).

9. The coffee grinding device according to claim 1, characterized in that: It also includes a powder collecting ring (8), which is fixed to the outer retaining ring (4), and the powder outlet side of the grinding disc (3) is connected to the powder collecting ring (8).

10. A coffee machine, characterized in that, include: The bean grinding apparatus as described in any one of claims 1-9.

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