Bean grinding device and coffee machine

Abstract

The invention discloses a bean grinding device and a coffee machine. The bean grinding device comprises a shell with a containing cavity; the movable grinding wheel is assembled in the accommodating cavity; the movable grinding wheel is sleeved with the grinding cutterhead, and a grinding gap is formed between the movable grinding wheel and the grinding cutterhead; the outer retainer ring is in threaded connection with the shell; the fixing assembly is arranged between the grinding cutterhead and the outer retainer ring; the axial guide assembly is arranged in the containing cavity, and the grinding cutter head is connected with the axial guide assembly. According to the grinding device, the movement track of the grinding cutterhead is restrained through the axial guide assembly, so that the grinding cutterhead only moves axially when the outer check ring rotates, it is ensured that the axes before and after adjustment are kept consistent, the pressure of the grinding face is evenly distributed, and the fixing assembly is combined to provide pre-tightening force deviating from the grinding cutterhead for the outer check ring; the outer check ring is prevented from acting on the grinding cutter head due to the influence of vibration in the grinding process or counter-acting force of materials, the stability of the grinding gap is maintained, it is guaranteed that ground coffee powder is uniform in thickness, the extracted flavor is balanced and stable, and the use experience of consumers is improved.

Description

Technical Field

[0001] The present application relates to the technical field of household appliances, and in particular to a bean grinding device and a coffee machine. Background Art

[0002] The coffee machine's grinding mechanism grinds coffee beans into the ground coffee needed for brewing. This grinding mechanism typically features an adjustment mechanism that controls the coarseness of the ground coffee by varying the gap between the moving and stationary grinding wheels. Existing grinding mechanisms, such as those described in patent (CN222149835U), utilize an external retaining ring to drive the axial movement of the stationary grinding wheel to achieve gap adjustment. However, this solution suffers from a serious drawback, resulting in a loss of control over grinding accuracy.

[0003] Specifically, existing devices rely on a threaded structure to drive the static grinding wheel up and down. However, due to the characteristics of the threaded structure, the static grinding wheel is prone to axial deviation during movement, resulting in eccentric contact between the moving and static grinding wheels. This eccentricity directly leads to an imbalance in the pressure distribution on the grinding surface. Localized high-pressure areas cause excessive grinding to produce fine powder, while low-pressure areas lack contact and retain coarse particles. This results in varying coarseness of ground coffee at the same time.

[0004] What's more serious is that the pressure imbalance caused by eccentricity will intensify the high-frequency vibration during the grinding process. The superimposed reaction force of the crushed coffee beans will cause the outer ring to displace during the grinding process, which in turn causes the grinding gap to continue to expand during the grinding process, resulting in fluctuations in the particle size of the same batch of coffee powder at different times. The uniformity of the coffee powder particles is completely out of control. During extraction, the fine powder blocks the water flow, causing over-extraction and bitterness, while the coarse powder forms a channel effect, resulting in under-extraction and blandness. The flavor balance of the coffee is completely destroyed, giving consumers a very poor user experience. Summary of the Invention

[0005] In order to overcome at least one of the above-mentioned defects of the prior art, the present application provides a bean grinding device that can ensure that the ground coffee powder is uniform in coarseness and fineness, extract a balanced and stable flavor, and improve the consumer experience.

[0006] According to an embodiment of the present application, a bean grinding device includes: a shell, the shell having an accommodating cavity; a movable grinding wheel, the movable grinding wheel being assembled in the accommodating cavity; a grinding disc, the grinding disc being sleeved on the movable grinding wheel, and a grinding gap being formed between the movable grinding wheel and the grinding disc; an outer retaining ring, the outer retaining ring being threadedly connected to the shell; a fixing assembly, the fixing assembly being arranged between the grinding disc and the outer retaining ring, and being used to provide a pre-tightening force to the outer retaining ring away from the grinding disc; an axial guide assembly, the axial guide assembly being arranged in the accommodating cavity, the grinding disc being connected to the axial guide assembly, and the axial guide assembly drives the grinding disc to move axially when the outer retaining ring rotates.

[0007] In this bean grinding device, the axial guide component constrains the movement trajectory of the grinding disc, so that the grinding disc only moves axially when the outer retaining ring rotates, eliminating radial freedom, preventing the lateral component of the outer retaining ring from causing the grinding disc to tilt when the thread is adjusted, ensuring that the axis before and after adjustment remains consistent, so that the pressure distribution on the grinding surface is uniform, and combined with the fixing component, a pre-tightening force away from the grinding disc is provided to the outer retaining ring, preventing the outer retaining ring from being affected by the vibration of the grinding process or the reaction force of the material and acting on the grinding disc, avoiding the outer retaining ring from driving the grinding disc during the grinding process, effectively maintaining the stability of the grinding gap, and realizing multi-dimensional combined protection, thereby ensuring that the ground coffee powder is uniform in coarseness and stable in extraction flavor, and improving the consumer experience.

[0008] According to some embodiments of the present application, a bean grinding body is mounted in the accommodating chamber. An axial hole extending vertically through the middle of the bean grinding body is provided. A transmission shaft is mounted in the axial hole. The movable grinding wheel is fixedly connected to the transmission shaft. The grinding disc is connected to the bean grinding body via at least two sets of axial guide assemblies.

[0009] According to some embodiments of the present application, the grinding disc includes a grinding portion and an assembly portion, the grinding portion is sleeved on the movable grinding wheel, and the assembly portion is arranged on the outside of the grinding portion; a first elastic member is arranged between the bean grinding body and the assembly portion.

[0010] According to some embodiments of the present application, the bean grinding body is provided with a first slot corresponding to the first elastic member, and the assembly portion is provided with a second slot corresponding to the first elastic member, and the first slot is arranged opposite to the second slot.

[0011] According to some embodiments of the present application, the axial guide assembly includes a main body latch and a cutter disc plug-in post, wherein the main body latch is arranged on the side of the bean grinding body facing the grinding cutter disc, and the cutter disc plug-in post is arranged on the side of the grinding cutter disc facing the bean grinding body, and the cutter disc plug-in post is plugged into the main body latch.

[0012] According to some embodiments of the present 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 are 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 the present application, the fixing assembly includes a metal fixing 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 fixing ring.

[0014] According to some embodiments of the present application, a powder scraping assembly is also included, which includes: a fixed plate, fixed to the movable grinding wheel; a fixed ring, fixed to the side of the fixed plate facing away from the movable grinding wheel; a powder scraping piece, movably mounted on the fixed plate and abutting against the powder outlet side of the grinding disc; a second elastic piece, abutting against the fixed ring and the powder scraping piece; when the grinding disc moves axially, the second elastic piece undergoes elastic deformation, so that the powder scraping piece always abuts against the powder outlet side of the grinding disc.

[0015] According to some embodiments of the present application, a powder collecting ring is further included, wherein the powder collecting ring is fixedly connected to the outer retaining ring, and the powder outlet side of the grinding cutter disc is connected to the powder collecting ring.

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

[0017] In summary, the bean grinding device provided by this application has the following technical effects: The axial guide component constrains the movement trajectory of the grinding disc, so that the grinding disc only moves axially when the outer retaining ring rotates, eliminating radial freedom, preventing the lateral component of the outer retaining ring from causing the grinding disc to tilt when the thread is adjusted, ensuring that the axis before and after adjustment remains consistent, so that the pressure distribution on the grinding surface is uniform, and combined with the fixing component, a pre-tightening force away from the grinding disc is provided to the outer retaining ring to prevent the outer retaining ring from being affected by the vibration of the grinding process or the reaction force of the material and acting on the grinding disc, avoiding the outer retaining ring from driving the grinding disc during the grinding process, effectively maintaining the stability of the grinding gap, and realizing multi-dimensional combined protection, thereby ensuring that the ground coffee powder is uniform in coarseness and stable in extraction flavor, and improving the consumer experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the bean grinding device according to Example 1 of the present application; Figure 2 This is a cross-sectional view of the bean grinding device according to Example 1 of the present application; Figure 3 This is a schematic diagram of the assembly of the fixing assembly of Example 1 of the present application; Figure 4 This is a schematic structural diagram of the bean grinding body according to the second embodiment of the present application; Figure 5 This is a schematic structural diagram of the grinding disc of Example 2 of the present application; Figure 6 This is a schematic structural diagram of the grinding disc of Example 3 of the present application; Figure 7 This is a schematic structural diagram of the outer retaining ring of Example 3 of the present application; Figure 8 Schematic structural diagram of the bean grinding device according to the fourth embodiment of the present application; Figure 9 Schematic structural diagram of the grinding cutter head according to the fourth embodiment of the present application; Figure 10 Schematic structural diagram of the outer retaining ring according to the fourth embodiment of the present application; Figure 11 Schematic structural diagram of the bean grinding device according to the fifth embodiment of the present application; Figure 12 Cross-sectional view of the bean grinding device according to the fifth embodiment of the present application; Figure 13 Assembly schematic diagram of the powder scraping assembly according to the fifth embodiment of the present application; Figure 14 Schematic structural diagram of the fixing ring according to the fifth embodiment of the present application.

[0019] Among them, the meanings of the reference numerals are as follows: 1. Outer shell; 11. Accommodation cavity; 12. Bean grinding main body; 13. Transmission shaft; 2. Moving grinding wheel; 3. Grinding cutter head; 31. Grinding part; 32. Assembly part; 33. First elastic member; 331. First spring; 34. First clamping groove; 35. Second clamping groove; 4. Outer retaining ring; 41. Elastic lever; 411. Second spring; 412. Lever; 413. Groove; 42. Gear position groove; 5. Fixing component; 51. Metal fixing ring; 52. Fixing column; 53. Abutting part; 6. Axial guiding component; 61. Main body clamping position; 62. Cutter head inserting column; 63. Cutter head limit; 7. Powder scraping assembly; 71. Fixing plate; 72. Fixing ring; 73. Powder scraping member; 74. Second elastic member; 75. Third clamping groove; 76. Protrusion; 77. Guiding channel; 8. Powder collecting ring. Detailed implementation manners

[0020] For better understanding and implementation, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application.

[0021] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0023] Embodiment 1: Referring to Figure 1 、 Figure 2 and Figure 3 , this embodiment discloses a coffee bean grinding device. The coffee bean grinding device includes a housing 1, a moving grinding wheel 2, a grinding cutter head 3, an outer retaining ring 4, a fixing component 5 and an axial guiding component 6; preferably, the housing 1 has a receiving cavity 11; the moving grinding wheel 2 is assembled in the receiving cavity 11; the grinding cutter head 3 is sleeved on the moving grinding wheel 2, and a grinding gap is formed between the moving grinding wheel 2 and the grinding cutter head 3; the outer retaining ring 4 is threadedly connected to the housing 1; the fixing component 5 is arranged between the grinding cutter head 3 and the outer retaining ring 4 and is used to provide a pre-tightening force for the outer retaining ring 4 away from the grinding cutter head 3; the axial guiding component 6 is arranged in the receiving cavity 11, the grinding cutter head 3 is connected to the axial guiding component 6, and when the outer retaining ring 4 rotates, the axial guiding component 6 drives the grinding cutter head 3 to move axially. In this embodiment, by the axial guiding component 6 restricting the movement track of the grinding cutter head 3, the grinding cutter head 3 only moves axially when the outer retaining ring 4 rotates, eliminating the radial degree of freedom, preventing the lateral component force during the threaded adjustment of the outer retaining ring 4 from causing the grinding cutter head 3 to tilt, ensuring that the axes before and after adjustment are consistent, so that the pressure distribution on the grinding surface is uniform, and combining with the fixing component 5 providing a pre-tightening force for the outer retaining ring 4 away from the grinding cutter head 3, preventing the outer retaining ring 4 from acting on the grinding cutter head 3 under the influence of the vibration during the grinding process or the reaction force of the material, avoiding the outer retaining ring 4 driving the grinding cutter head 3 during the grinding process, effectively maintaining the stability of the grinding gap, realizing multi-dimensional combined guarantee, thereby ensuring that the ground coffee powder is uniform in thickness, the extraction flavor is balanced and stable, and improving the consumer use experience.

[0024] Optionally, the axes of the housing 1, the moving grinding wheel 2 and the grinding cutter are collinear; optionally, the axis is consistent with the height direction. In this way, when the outer retaining ring 4 rotates, the axial guiding component 6 limits the up and down movement of the grinding cutter head 3. Optionally, the grinding cutter head 3 is provided with a grinding cavity penetrating up and down, and the grinding cutter head 3 is sleeved on the moving grinding wheel 2 through the grinding cavity. The coffee beans fall into the grinding cavity of the grinding cutter head 3 and uniformly enter the grinding gap formed between the grinding cutter head 3 and the moving grinding wheel 2 under the combined action of gravity and the centrifugal force of the rotation of the moving grinding wheel 2 for grinding. Optionally, the axial guiding component 6 can be a guiding rod, a guide rail and a chute arranged along the axial direction to guide and restrict the grinding cutter head 3 to only move axially when the outer retaining ring 4 rotates; optionally, the fixing component 5 can be an elastic element, a rigid element and a damping element abutting / fixedly connected to the outer retaining ring 4 to provide a pre-tightening force for the outer retaining ring 4 away from the grinding cutter head 3.

[0025] In this embodiment, before the grinding operation, the outer retaining ring 4 threadedly connected to the shell 1 can be used to generate an up and down movement when rotating, so as to drive the grinding disc 3 to move up and down relative to the movable grinding wheel 2 to adjust the grinding gap. Preferably, during the up and down movement of the grinding disc 3, the grinding disc 3 is constrained by the axial guide component 6 to keep it only moving up and down, so as to prevent the outer retaining ring 4 from tilting due to the lateral component of the thread adjustment, thereby ensuring that the axis before and after adjustment remains consistent, so that the pressure distribution on the grinding surface is uniform, and grinding protection in the spatial dimension is achieved, ensuring that the coarseness of the coffee powder particles ground in each area of the grinding gap is uniform. During the grinding operation, a pre-tightening force away from the grinding disc 3 is provided to the outer retaining ring 4 by the fixing component 5, so as to prevent the outer retaining ring 4 from being affected by the vibration of the grinding process or the reaction force of the material and acting on the grinding disc 3, thereby preventing the outer retaining ring 4 from driving the grinding disc 3 during the grinding process, effectively maintaining the stability of the grinding gap, and achieving grinding protection in the time dimension, thereby ensuring that the particle size of the same batch of coffee powder is uniform before and after, and ultimately ensuring a balanced and stable flavor.

[0026] Example 2: See Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 This embodiment also discloses a bean grinding device. The main differences between this embodiment and the aforementioned embodiments are: a bean grinding body 12 is mounted within a receiving chamber 11. An axial hole extending vertically through the center of the bean grinding body 12 is provided, which is fitted with a drive shaft 13. The dynamic grinding wheel 2 is fixedly connected to the drive shaft 13. The grinding disc 3 and the bean grinding body 12 are connected by at least two sets of axial guide assemblies 6. Preferably, the two sets of axial guide assemblies 6 are spaced apart along the circumference of the grinding disc 3 to ensure uniform force distribution during axial movement of the grinding disc 3, preventing structural deformation caused by concentrated force on one side of the axial guide assembly 6. Furthermore, the lateral force component of the outer retaining ring 4 during threaded adjustment is synchronously offset by the two sets of axial guide assemblies 6, preventing axial deviation of the grinding disc 3 due to asymmetric loads. Optionally, the axes of the housing 1, the dynamic grinding wheel 2, the drive shaft 13, and the grinding discs are collinear.

[0027] See Figure 4 and Figure 5, Preferably, the axial guiding assembly 6 includes a main body clamping position 61 and a cutter head inserting column 62. The main body clamping position 61 is arranged on the side of the grinding main body 12 facing the grinding cutter head 3, and the cutter head inserting column 62 is arranged on the side of the grinding cutter head 3 facing the grinding main body 12. The cutter head inserting column 62 is inserted into the main body clamping position 61. It should be noted that the cutter head inserting columns 62 and the main body clamping positions 61 are in one-to-one correspondence, so that the grinding cutter head 3 is evenly stressed during axial movement, and can always maintain concentricity with the moving grinding wheel 2. By rotating the outer retaining ring 4 threadedly connected to the housing 1, the grinding gap between the grinding cutter head 3 and the moving grinding wheel 2 can be precisely controlled. It effectively avoids the problem of non-concentricity between the grinding cutter head 3 and the moving grinding wheel 2 that may occur in the traditional screw lifting mechanism, makes the pressure distribution on the grinding surface uniform, realizes the grinding guarantee in the spatial dimension, and thus ensures that the coffee powder particles ground in each area of the grinding gap are uniform in particle size.

[0028] Furthermore, the cutter head inserting column 62 can be arranged in a cylindrical shape or a prismatic shape. In this embodiment, the number of axial guiding assemblies 6 is multiple groups, and the multiple groups of axial guiding assemblies 6 are arranged at intervals along the circumferential direction of the grinding cutter head 3. Optionally, the axial guiding assembly 6 has both a cutter head inserting column 62 in a cylindrical shape and a cutter head inserting column 62 in a prismatic shape, and the cutter head inserting column 62 in a cylindrical shape and the cutter head inserting column 62 in a prismatic shape are arranged alternately along the circumferential direction of the grinding cutter head 3. Correspondingly, the main body clamping position 61 includes a main body clamping position 61 with a circular hole and a main body clamping position 61 with a square hole. The main body clamping position 61 with a circular hole is inserted with the cutter head inserting column 62 in a cylindrical shape, and the main body clamping position 61 with a square hole is inserted with the cutter head inserting column 62 in a prismatic shape. In this way, a mixed constraint is formed by using the cylindrical structure and the prismatic structure. The line contact wear mode of the cylindrical structure is different from the surface contact wear mode of the prismatic structure. The staggered layout avoids premature failure of a single contact form, extends the service life of the axial guiding assembly 6. At the same time, the cylindrical structure can provide flexible tolerance, and the prismatic structure provides rigid guidance. The two complement each other to avoid jamming or stress concentration caused by "over-constraint", and at the same time ensure the axis consistency under dynamic adjustment. And the arc surface of the cylindrical structure can attenuate high-frequency vibration energy, and the plane of the prismatic structure locks to suppress low-frequency displacement, forming a broadband anti-vibration barrier, further improving the anti-vibration stability of the coffee bean grinding device.

[0029] Refer to Figure 2 , Furthermore, in order to ensure the use safety of the grinding cutter head 3, a cutter head limit 63 is arranged between at least two adjacent main body clamping positions 61. The cutter head limit 63 is used to limit the maximum distance of the grinding gap. The design of the cutter head limit 63 ensures that during the displacement process of the grinding cutter head 3, it will not cause too large a grinding gap due to excessive movement, resulting in larger particles, and can also prevent structural damage or wear caused by excessive movement.

[0030] Embodiment Three: Refer to Figure 1and Figure 2 This embodiment also discloses a bean grinding device. The main difference between this embodiment and the above-mentioned embodiments is that the fixing assembly 5 includes a metal fixing ring 51 , which is fixed to the side of the grinding disc 3 facing the outer retaining ring 4 . The side of the outer retaining ring 4 facing the grinding disc 3 abuts against the metal fixing ring 51 . Preferably, the metal fixing ring 51 made of metal has high rigidity, which blocks the transmission of the working vibration of the grinding cutter disc 3 and can construct a closed path of "metal fixing ring 51-outer retaining ring 4-grinding cutter disc 3-metal fixing ring 51", wherein the metal fixing ring 51 provides a pre-tightening force away from the grinding cutter 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 acting on the grinding cutter disc 3, thereby avoiding the outer retaining ring 4 driving the grinding cutter disc 3 to move relative to the grinding cutter disc 3, ensuring that the grinding cutter disc 3 stably maintains the corresponding position, so that the metal fixing ring 51 fixed to the lower end of the grinding cutter disc 3 can continuously provide a pre-tightening force away from the grinding cutter disc 3 to the outer retaining ring 4.

[0031] See Figure 6 and Figure 7 Optionally, a fixing post 52 is provided at the lower end of the grinding cutter disc 3, and the metal fixing ring 51 is fixedly connected to the fixing post 52. Optionally, the fixing can be a snap connection, a bolt connection, a 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 cutter disc 3 by fasteners such as bolts / screws, so that the grinding cutter disc 3 and the metal fixing ring 51 are connected to form a stable integral structure; Optionally, an abutment portion 53 is provided on the inner wall of the outer retaining ring 4, and the abutment portion 53 abuts against the metal fixing ring 51. Preferably, the abutment portion 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 pre-tightening force 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 fully offsetting the tendency of the outer retaining ring 4 to move due to vibration or the reaction force of the material during the grinding process. Optionally, the abutting portion 53 is a top ring structure arranged around the inner wall of the outer retaining ring 4 .

[0032] Example 4: See Figure 5 and Figure 8, this embodiment also discloses a coffee bean grinding device. The main difference between the coffee bean grinding device in this embodiment and the above-mentioned embodiment is that the grinding cutter head 3 includes a grinding part 31 and an assembling part 32. The grinding part 31 is sleeved on the moving grinding wheel 2, and the assembling part 32 is arranged outside the grinding part 31; a first elastic member 33 is arranged between the coffee bean grinding main body 12 and the assembling part 32. Preferably, by arranging the first elastic member 33 between the coffee bean grinding main body 12 and the assembling part 32, the assembling part 32 is urged to abut against the outer retaining ring 4, ensuring that the outer retaining ring 4 can drive the grinding cutter head 3 to move up and down. Specifically, when the outer retaining ring 4 that is threadedly connected to the outer shell 1 is rotated to drive the outer retaining ring 4 to move upward, the outer retaining ring 4 simultaneously pushes the grinding cutter head 3 upward and compresses the first elastic member 33. When the outer retaining ring 4 that is threadedly connected to the outer shell 1 is rotated to drive the outer retaining ring 4 to move downward, the first elastic member 33 pushes the grinding cutter head 3 downward, so that the grinding cutter head 3 and the outer retaining ring 4 always remain in abutment, realizing that the outer retaining ring 4 can drive the grinding cutter head 3 to move up and down. At the same time, since the first elastic member 33 is arranged between the coffee bean grinding main body 12 and the assembling part 32, the first elastic member 33 is isolated from the grinding cavity, preventing coffee beans from being stuck in the spiral gap of the spring during the grinding process and interrupting the feeding, completely avoiding the phenomenon of spring jamming beans in the traditional solution, and constructing an anti-jamming bean grinding system without spring exposure.

[0033] Refer to Figure 2 、 Figure 4 and Figure 5 , preferably, the coffee bean grinding main body 12 is provided with a first card slot 34 corresponding to the first elastic member 33, and the assembling part 32 is provided with a second card slot 35 corresponding to the first elastic member 33. The first card slot 34 and the second card slot 35 are arranged opposite to each other. Preferably, the first elastic member 33 is fixed by the relatively arranged first card slot 34 and second card slot 35 together, so that both ends of the first elastic member 33 are fixed at the same time, preventing the first elastic member 33 from running off under force, ensuring that the first elastic member 33 can continuously apply an axial force to the assembling part 32, so that the assembling part 32 always stably abuts against the outer retaining ring 4. In this way, when the outer retaining ring 4 that is threadedly connected to the outer shell 1 is rotated, the grinding cutter head 3 can be effectively driven to move up and down to adjust the grinding gap.

[0034] Refer to Figure 1 、 Figure 4 、 Figure 5 and Figure 8Further, the assembly part 32 is arranged around the outside of the grinding part 31. The first elastic member 33 includes a plurality of first springs 331, and the plurality of first springs 331 are arranged at intervals along the circumferential direction, so that the first elastic member 33 can uniformly apply a pre-tightening force to the grinding cutter head 3, realizing the application of the pre-tightening force at multiple points, avoiding uneven force at a single point, ensuring that the assembly part 32 of the grinding cutter head 3 is closely attached to the outer retaining ring 4. In this way, when the outer retaining ring 4 rotates, it can effectively drive the grinding cutter head 3 to move up and down synchronously, prevent the movement of the grinding cutter head 3 from lagging, and make the adjustment more accurate.

[0035] Refer to Figure 8 , Figure 9 and Figure 10 , further, an elastic lever 41 is arranged on the side of the outer retaining ring 4 facing the grinding cutter head 3; a plurality of gear slots 42 are arranged along the circumferential direction on the side of the grinding cutter head 3 facing the outer retaining ring 4, the gear slots 42 are abutted against the elastic lever 41, and the rotation of the outer retaining ring 4 will drive the elastic lever 41 to move between adjacent gear slots 42 to provide tactile and / or auditory feedback. Preferably, as the outer retaining ring 4 rotates, the elastic lever 41 moves between adjacent gear slots 42 and abuts against the gear slots 42 to provide tactile and / or auditory feedback to the user, such as an obvious clicking feeling or a change in resistance, so that the user can clearly perceive the change when the outer retaining ring rotates one gear. This immediate feedback enhances the user's sense of control and accuracy in operation, making it more intuitive and easier to adjust the grinding gap. Optionally, the elastic lever 41 includes a second spring 411 and a lever 412, the second spring 411 is arranged in a groove ? 413 on the side of the outer retaining ring facing the grinding cutter head 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 will alternately abut against different gear slots 42 to generate obvious tactile feedback. Whenever the lever 412 moves from one gear slot 42 to the next, the user can feel a clear clicking feeling or a change in resistance, so as to clearly know the current gear position. Greatly improve the accuracy of the user to adjust the grinding gap. The user does not need to rely on visual confirmation and can accurately find and locate the required grinding gear only by touch, making the operation more convenient and efficient. When the outer retaining ring rotates, the lever 412 will move with the change of the slot position. Due to the elastic force of the second spring 411, the lever 412 will generate an obvious change in resistance or a clicking feeling during the movement, providing stable tactile feedback to the user. This feedback enables the user to clearly perceive the change when the outer retaining ring rotates one gear.

[0036] Embodiment Five: Refer to Figure 11 , Figure 12 and Figure 13 It should be noted that there is an unclear symbol "?" in the original text in the description of the groove where the second spring is located in item [9], which is retained as it is in the translation. If there is an error in the original text, it may need to be further confirmed and corrected according to the actual situation.This embodiment also discloses a bean grinding device. The main difference between this embodiment and the above-mentioned embodiments is that the bean grinding device further includes a powder scraping assembly 7, which comprises a fixed plate 71 fixedly connected to the moving grinding wheel 2; a fixed ring 72 fixedly connected to the side of the fixed plate 71 facing away from the moving grinding wheel 2; a powder scraping member 73 movably mounted on the fixed plate 71 and abutting the powder outlet side of the grinding disc 3; and a second elastic member 74 abutting the fixed ring 72 and the powder scraping member 73. When the grinding disc 3 moves axially, the second elastic member 74 elastically deforms, ensuring that the powder scraping member 73 always abuts the powder outlet side of the grinding disc 3. The second spring 74 is pressed against the second end of the blade 74, and the powder scraper 73 is pressed against the powder scraper 73 to release the powder from the blade 7. The second spring 74 is pressed against the second end of the blade 74, and the powder scraper 73 is pressed against the second end of the blade 74.

[0037] See Figure 11 and Figure 12 Optionally, a powder collecting ring 8 is further included. The powder collecting ring 8 is fixed to the outer retaining ring 4, and the powder outlet side of the grinding cutter disc 3 is connected to the powder collecting ring 8. Specifically, the powder collecting ring 8 is connected to the powder outlet side of the grinding cutter disc 3, so that the ground powder is effectively collected in the powder collecting ring 8 and discharged centrally by the powder collecting ring 8, avoiding disorderly splashing or residue of powder, thereby improving the powder collection efficiency. Furthermore, after the grinding is completed, the cleaning work of the powder is more centralized and convenient. It is only necessary to clean the powder collecting ring 8 without cleaning a large area, thereby reducing the cleaning difficulty and workload.

[0038] See Figure 11 and Figure 12, Further, the powder collecting ring 8 is arranged below the grinding cutter head 3, and the lower end of the powder scraping member 73 extends into the powder collecting ring 8, so that the powder scraping member 73 is in contact with both the inner side wall of the powder collecting ring 8 and the powder discharging side of the grinding cutter head 3; when the outer baffle drives the grinding cutter head 3 to move upward synchronously, the powder collecting ring 8 will also move upward, and the second elastic member 74 is used to elastically drive the powder scraping member 73 to move upward, so that the powder scraping member 73 remains in contact with both the inner side wall of the powder collecting ring 8 and the powder discharging side of the grinding cutter head 3; when the outer baffle drives the grinding cutter head 3 to move downward synchronously, the powder collecting ring 8 will also move downward, and the powder discharging side of the grinding cutter head 3 pushes the powder scraping member 73 downward and compresses the second elastic member 74. In this way, the powder scraping member 73 can still remain in contact with both the inner side wall of the powder collecting ring 8 and the powder discharging side of the grinding cutter head 3, realizing a full - range and dead - angle - free powder scraping function. It should be noted that during the coffee bean grinding process, coffee powder is likely to adhere to the powder discharging side of the grinding cutter head 3 and the inner side wall of the powder collecting ring 8. If these residual powders cannot be removed in time, it will not only affect the quality of the subsequent coffee powder, but also may cause blockage and wear inside the grinding component. In this embodiment, when the grinding cutter head 3 moves upward, the second elastic member 74 releases elastic force to drive the powder scraping member 73 to move upward, ensuring that the powder scraping member 73 always remains in close contact with the inner side wall of the powder collecting ring 8 and the powder discharging side of the grinding cutter head 3, effectively scraping off the attached coffee powder. When the grinding cutter head 3 moves downward, the powder discharging side of the grinding cutter head 3 pushes the powder scraping member 73 downward, compressing the second elastic member 74, but the powder scraping member 73 can still remain in contact with both the inner side wall of the powder collecting ring 8 and the powder discharging side of the grinding cutter head 3 under the action of elastic force and continue to perform the powder scraping task. This adaptive powder scraping mechanism can adjust the position of the powder scraping member 73 in real time according to the movement of the grinding cutter head 3, always maintaining an efficient powder scraping effect, ensuring the smooth progress of the coffee bean grinding process, while also extending the service life of the grinding component and reducing the difficulty and workload of equipment cleaning.

[0039] Refer to Figure 12 , Further, the powder scraping member 73 is connected to the moving grinding wheel 2 through a fixing plate 71. Driven by the transmission shaft 13, the powder scraping member 73 rotates synchronously with the moving grinding wheel 2. Preferably, the lower end of the transmission shaft 13 extends out of the moving grinding wheel 2 and is connected to the fixing plate 71. A third card slot 75 is arranged at the lower end of the moving grinding wheel 2, and a protrusion 76 inserted into the third card slot 75 is arranged at the upper end of the fixing plate 71. When assembling the fixing plate 71, first sleuth the fixing plate 71 on the transmission shaft 13, and then align the protrusion 76 with the third card slot 75 and insert it, which can ensure that the installation position of the fixing plate 71 on the moving grinding wheel 2 is accurate. This precise positioning avoids the situation of offset or inclination during the installation of the fixing plate 71, ensures the concentricity between the fixing plate 71 and the moving grinding wheel 2, and thus improves the uniformity and stability of powder scraping.

[0040] Refer to Figure 14, Further, the fixing ring 72 is provided with a guiding channel 77, and the powder scraping member 73 is in sliding fit with the guiding channel 77. Under the constraint of the guiding channel 77, when the powder scraping member 73 moves up and down on the grinding cutter head 3, it can only move up and down, preventing the powder scraping member 73 from shifting due to reasons such as vibration and hard object impact, thereby ensuring the uniformity and consistency of the powder scraping effect.

[0041] Embodiment Six: A coffee machine in this embodiment. The coffee machine includes the grinding device of any one of the above embodiments.

[0042] The technical means disclosed in the solution of this application are not limited to the technical means disclosed in the above embodiments, but also include the technical solutions composed of any combination of the above technical features. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of this application, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of this application.

Claims

1. A bean grinding device, characterized in that, Comprising: A housing (1), the housing (1) having a receiving cavity (11); A moving grinding wheel (2), the moving grinding wheel (2) being assembled in the receiving cavity (11); A grinding cutter disc (3), the grinding cutter disc (3) being sleeved on the moving grinding wheel (2), and a grinding gap being formed between the moving grinding wheel (2) and the grinding cutter disc (3); An outer retaining ring (4), the outer retaining ring (4) being threadedly connected to the housing (1); A fixing assembly (5), the fixing assembly (5) being disposed between the grinding cutter disc (3) and the outer retaining ring (4) for providing a pre-tightening force to the outer retaining ring (4) away from the grinding cutter disc (3); An axial guiding assembly (6), the axial guiding assembly (6) being disposed in the receiving cavity (11), the grinding cutter disc (3) being connected to the axial guiding assembly (6), and the axial guiding assembly (6) driving the grinding cutter disc (3) to move axially when the outer retaining ring (4) rotates.

2. The coffee bean grinding device according to claim 1, wherein: A bean grinding main body (12) is assembled in the receiving cavity (11), a shaft hole penetrating up and down is provided in the middle of the bean grinding main body (12), a transmission shaft (13) is assembled in the shaft hole, and the moving grinding wheel (2) is fixedly connected to the transmission shaft (13); The grinding cutter disc (3) is connected to the bean grinding main body (12) through at least two groups of the axial guiding assemblies (6).

3. The coffee bean grinding device according to claim 2, wherein: The grinding cutter disc (3) includes a grinding portion (31) and an assembling portion (32), the grinding portion (31) being sleeved on the moving grinding wheel (2), and the assembling portion (32) being disposed outside the grinding portion (31); A first elastic member (33) is disposed between the bean grinding main body (12) and the assembling portion (32).

4. The coffee bean grinding device according to claim 3, wherein: The bean grinding main body (12) is provided with a first clamping groove (34) corresponding to the first elastic member (33), the assembling portion (32) is provided with a second clamping groove (35) corresponding to the first elastic member (33), and the first clamping groove (34) and the second clamping groove (35) are oppositely disposed.

5. The coffee bean grinding device according to claim 2, characterized in that: The axial guiding assembly (6) includes a main body clamping position (61) and a cutter disc insertion post (62), the main body clamping position (61) being disposed on a side of the bean grinding main body (12) facing the grinding cutter disc (3), the cutter disc insertion post (62) being disposed on a side of the grinding cutter disc (3) facing the bean grinding main body (12), and the cutter disc insertion post (62) being inserted into the main body clamping position (61).

6. The coffee bean grinding device according to claim 1, wherein: An elastic lever (41) is disposed on a side of the outer retaining ring (4) facing the grinding cutter disc (3); A plurality of gear slots (42) are arranged circumferentially on a side of the grinding cutter disc (3) facing the outer retaining ring (4), the gear slots (42) being abutted against the elastic lever (41), and the rotation of the outer retaining ring (4) driving the elastic lever (41) to move between adjacent gear slots (42) to provide tactile and / or auditory feedback.

7. The coffee bean grinding device according to claim 1, wherein: The fixing assembly (5) comprises a metal fixing ring (51), the metal fixing ring (51) being fixed to the side of the grinding cutter disc (3) facing the outer retaining ring (4), and the side of the outer retaining ring (4) facing the grinding cutter disc (3) being in contact with the metal fixing ring (51).

8. The coffee bean grinding device according to claim 1, wherein: It also includes a powder scraping component (7), which includes: A fixed plate (71) fixedly connected to the movable grinding wheel (2); A fixed ring (72) is fixedly connected to a side of the fixed plate (71) facing away from the movable grinding wheel (2); A powder scraper (73) is movably sleeved on the fixed disc (71) and abuts against the powder outlet side of the grinding disc (3); The second elastic member (74) abuts against the fixing ring (72) and the powder scraping member (73); when the grinding disc (3) moves axially, the second elastic member (74) undergoes elastic deformation, so that the powder scraping member (73) always abuts against the powder outlet side of the grinding disc (3).

9. The coffee bean grinding device according to claim 1, wherein: 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 cutter disc (3) is connected to the powder collecting ring (8).

10. A coffee machine, characterized in that, include: The bean grinding device according to any one of claims 1 to 9.

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