Bean grinding device for coffee machine

Abstract

The utility model discloses a bean grinding device for a coffee machine, which comprises a grinding bracket, an inner grinding head and an outer grinding disc assembly, and the grinding bracket is provided with a grinding cavity; the inner grinding head is arranged in the grinding cavity; the outer grinding disc assembly is arranged on the grinding support and matched with the inner grinding head. Wherein the outer millstone assembly comprises an outer millstone and a millstone seat, and the outer millstone and the millstone seat are integrally formed; and the grinding disc seat is fixedly connected with the grinding bracket through an inserting structure. Therefore, according to the bean grinding device for the coffee machine, the outer grinding disc and the grinding disc base are integrally formed, the processing technology and the assembling procedure are simplified, the structure is simple, the manufacturing cost is remarkably reduced, and the use experience of a user is improved; in addition, the millstone base and the grinding support are fixedly connected through an inserting structure, a user can conveniently disassemble and assemble the millstone base and clean the grinding cavity and the outer millstone, and meanwhile the situation that the thickness of grinding powder is affected due to matching errors generated in the assembling process of the outer millstone and the millstone base is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of coffee machines, in particular to a coffee bean grinding device for a coffee machine. Background Art

[0002] The bean grinding device in the prior art is a grinding device for a bean grinding coffee machine disclosed in patent authorization number CN 219396960 U, which includes a grinding bracket, a grinding chamber is provided on the grinding bracket, a powder outlet is opened on the side wall of the grinding bracket, a grinding assembly with adjustable coarseness of the ground powder is provided on the grinding chamber, and a scraper assembly is provided on the lower side of the grinding assembly, the powder outlet is connected to a powder outlet channel, the grinding assembly includes a rotatable rotating sleeve arranged on the outer side of the grinding chamber, a movable seat is provided in the grinding chamber and cooperates with the rotating sleeve to move up and down in the grinding chamber as the rotating sleeve rotates, a detachable knife disc assembly is provided in the movable seat, a motor assembly is provided at the bottom of the grinding bracket and rotates into the grinding chamber, a grinding knife for grinding in cooperation with the knife disc assembly is provided on the rotating shaft of the motor assembly, and the scraper assembly is provided on the rotating shaft of the motor assembly, and the coarseness of the ground powder is adjusted by adjusting the grinding gap between the knife disc assembly and the grinding knife.

[0003] However, in actual use, since the outer grinding disc and the movable seat are arranged to be detachably connected, and when cleaning the grinding chamber, the movable seat and the outer grinding disc are frequently disassembled and assembled, the matching error between the two gradually increases, which directly affects the coarseness of the ground powder, resulting in a poor user experience. Secondly, the separate design of the outer grinding disc and the movable seat makes the structure of the entire grinding device relatively complicated, which not only increases the difficulty of the processing technology, but also increases the manufacturing cost. Utility Model Content

[0004] In order to overcome the defects described in the above-mentioned prior art, the utility model provides a bean grinding device for a coffee machine, in which the outer grinding disc and the grinding disc seat are arranged as an integrated structure, which not only simplifies the processing technology and assembly process, but also has a simple structure, significantly reduces the manufacturing cost, and improves the user experience. At the same time, it also avoids the matching errors between multiple parts affecting the coarseness of the ground powder.

[0005] The technical solution adopted by the utility model to solve the problem is:

[0006] A coffee bean grinding device for a coffee machine, comprising:

[0007] A grinding support, which is provided with a grinding chamber;

[0008] An inner grinding head, which is arranged in the grinding chamber;

[0009] An outer grinding disc assembly, which is arranged on the grinding bracket and cooperates with the inner grinding head;

[0010] Among them, the outer grinding disc assembly includes an outer grinding disc and a grinding disc seat, and the outer grinding disc and the grinding disc seat are integrally formed; the grinding disc seat and the grinding bracket are connected and fixed by a plug-in structure.

[0011] Preferably, the plug-in structure includes a first plug-in portion arranged on the outer side of the grinding disc seat and a second plug-in portion arranged on the grinding bracket, and the first plug-in portion is plug-connected with the second plug-in portion to connect and fix the grinding disc seat to the grinding bracket.

[0012] Preferably, one of the first plug-in portion and the second plug-in portion is an insert block, and the other of the first plug-in portion and the second plug-in portion is a slot.

[0013] Preferably, it also includes a rotating part, which can drive the grinding disc seat to move up and down when it rotates, so that the outer grinding disc moves up and down relative to the inner grinding head to change the position between the two, thereby achieving the adjustment of the coarseness of the ground powder.

[0014] Preferably, the rotating member comprises a first rotating sleeve, the first rotating sleeve is provided with an internal thread, and the grinding disc seat is provided with an external thread matching the internal thread;

[0015] When the first rotating sleeve rotates, the grinding disc seat moves up and down through the thread cooperation between the external thread and the internal thread.

[0016] Preferably, the rotating member further comprises a second rotating sleeve, the second rotating sleeve is provided with a first tooth-shaped retaining position, the first rotating sleeve is provided with a second tooth-shaped retaining position, and the first tooth-shaped retaining position is engaged with the second tooth-shaped retaining position to connect the first rotating sleeve with the second rotating sleeve;

[0017] When the second rotating sleeve rotates, the first rotating sleeve rotates through the meshing of the first tooth-shaped clamping position and the second tooth-shaped clamping position.

[0018] Preferably, the grinding chamber comprises a first chamber and a second chamber, the first chamber is annular and is for coarse grinding, and the second chamber is annular and is for fine grinding.

[0019] Preferably, the inner grinding head is provided with inner grinding coarse teeth and inner grinding fine teeth arranged up and down, and the outer grinding disc is provided with outer grinding coarse teeth and outer grinding fine teeth arranged up and down;

[0020] The first chamber is formed between the inner coarse grinding teeth and the outer coarse grinding teeth, and the second chamber is formed between the inner fine grinding teeth and the outer fine grinding teeth.

[0021] Preferably, it further comprises a driving assembly and a transmission box, wherein the driving assembly comprises a driving motor and a transmission shaft arranged on the grinding bracket; the output shaft of the driving motor and one end of the transmission shaft are both transmission-connected to the transmission box;

[0022] The other end of the transmission shaft extends into the grinding chamber, and the inner grinding head is sleeved on the other end of the transmission shaft to achieve grinding.

[0023] Preferably, a locking nut is further included, and the driving assembly further includes a material removing member sleeved on the other end of the transmission shaft and located at the bottom of the inner grinding head;

[0024] A convex column is provided on the top of the material-push piece, and a concave hole is provided at the bottom of the inner grinding head, and the convex column is engaged with the concave hole; the locking nut locks the inner grinding head and the material-push piece to fix the inner grinding head to the other end of the transmission shaft.

[0025] In summary, the utility model has the following technical effects:

[0026] 1. The outer grinding disc and the grinding disc seat in the present application are integrally formed, which not only simplifies the processing technology and assembly process, but also has a simple structure, significantly reduces the manufacturing cost, and improves the user experience. At the same time, since the grinding disc seat and the grinding bracket are connected and fixed by a plug-in structure, it is convenient for the user to disassemble and clean the grinding chamber and the outer grinding disc, avoiding the matching error between the outer grinding disc and the grinding disc seat during the assembly process, thereby affecting the coarseness of the ground powder.

[0027] 2. The grinding disc seat in the present application is matched with the first rotating sleeve by threads. When the first rotating sleeve is rotated, the grinding disc seat is driven to move up and down under the action of the threads, so that the position of the outer grinding disc relative to the inner grinding head changes, thereby adjusting the coarseness of the ground powder. Therefore, the positional relationship between the outer grinding disc and the inner grinding head is adjusted by thread matching, which improves the adjustment accuracy and facilitates the user to fine-tune the coarseness of the powder. At the same time, since the grinding disc seat and the first rotating sleeve are matched with threads, it is also convenient for the user to disassemble and assemble the bean grinding device, and then clean and clean the bean grinding device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the structure of the coffee bean grinding device for the utility model;

[0029] Figure 2 for Figure 1 The enlarged schematic diagram of the middle A part;

[0030] Figure 3 This is one of the exploded views of the bean grinding device for the coffee machine of the utility model;

[0031] Figure 4 This is the second exploded view of the bean grinding device for the coffee machine of the utility model;

[0032] Figure 5 It is a schematic diagram of the structure of the movable seat and the outer grinding disc in the bean grinding device for the coffee machine of the utility model;

[0033] Figure 6 It is a structural schematic diagram of the movable seat and the outer grinding disc in the bean grinding device for a coffee machine of the utility model from another perspective;

[0034] Figure 7 This is a schematic diagram of the structure of the inner grinding head in the bean grinding device for a coffee machine of the utility model;

[0035] Figure 8 It is a schematic structural diagram of the inner grinding head in the bean grinding device for a coffee machine of the utility model from another perspective;

[0036] Fig. 9 It is a schematic diagram of the structure of the second rotating sleeve in the bean grinding device for the coffee machine of the utility model;

[0037] Fig.10 The utility model is a schematic diagram of the structure inside the transmission box of the coffee bean grinding device for the coffee machine.

[0038] The meanings of the reference numerals are as follows:

[0039] 1. Grinding bracket; 11. Grinding chamber; 111. First chamber; 112. Second chamber; 113. Discharge port; 12. Driving motor; 13. Transmission box; 14. Transmission shaft; 141. Locking nut; 142. Elastic washer; 143. Gasket; 15. Material shifter; 151. Boss; 16. Slot; 17. Powder discharge channel; 2. Internal grinding head; 21. Internal grinding coarse teeth; 22. Internal grinding fine teeth ; 23. Through hole; 24. Concave hole; 3. External grinding disc assembly; 31. External grinding disc; 311. External grinding coarse teeth; 312. External grinding fine teeth; 32. Grinding disc seat; 321. Handle; 322. Insert block; 3221. External thread; 323. Protrusion; 4. Rotating member; 41. First rotating sleeve; 411. Internal thread; 412. Second tooth-shaped position; 42. Second rotating sleeve; 421. First tooth-shaped position. DETAILED DESCRIPTION

[0040] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0041] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the modules or components referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0043] like Figure 1-10 The coffee bean grinding device shown in the figure comprises a grinding bracket 1, an inner grinding head 2 and an outer grinding disc assembly 3. A grinding chamber 11 is provided inside the grinding bracket 1; the inner grinding head 2 is arranged in the grinding chamber 11; the outer grinding disc assembly 3 is arranged on the grinding bracket 1 and cooperates with the inner grinding head 2; wherein the outer grinding disc assembly 3 comprises an outer grinding disc 31 and a grinding disc seat 32, and the outer grinding disc 31 and the grinding disc seat 32 are integrally formed; the grinding disc seat 32 is connected and fixed to the grinding bracket 1 by a plug-in structure.

[0044] Based on the above structure, the grinding disc seat 32 and the outer grinding disc 31 of the coffee machine grinding device of the utility model are integrally formed. During assembly, the grinding disc seat 32 can be fixed by plugging and connecting the grinding disc seat 32 with the grinding bracket 1, so that the outer grinding disc 31 is located in the grinding chamber 11, thereby simplifying the structure, reducing the assembly between parts, and avoiding the matching errors between multiple parts that affect the coarseness of the ground powder. Secondly, since the grinding disc seat 32 and the grinding bracket 1 are connected and fixed by the plug-in structure, it is convenient for the user to disassemble the grinding disc seat 32 to clean the grinding chamber 11 and the outer grinding disc 31.

[0045] See also Figure 3-6 The plug-in structure includes a first plug-in portion arranged on the outer side of the grinding disc seat 32 and a second plug-in portion arranged on the grinding bracket 1. The first plug-in portion and the second plug-in portion are plug-connected to connect and fix the grinding disc seat 32 to the grinding bracket 1; wherein, one of the first plug-in portion and the second plug-in portion is an insert block 322, and the other of the first plug-in portion and the second plug-in portion is a slot 16.

[0046] It should be noted that, in the present embodiment, the first plug-in portion is an insert block 322, the second plug-in portion is a slot 16, and a convex portion 323 is further provided on the outer side of the grinding disc seat 32, the grinding disc seat 32 is plug-connected to the slot 16 through the insert block 322, the convex portion 323 abuts against the grinding bracket 1, and a handle 321 is further provided inside the grinding disc seat 32, so that the user can take the grinding disc seat 32 and the outer grinding disc 31 out of the grinding chamber 11 for cleaning.

[0047] See also Figure 3-9 The coffee bean grinding device of the utility model also includes a rotating member 4. When the rotating member 4 rotates, the grinding disc seat 32 can be driven to move up and down, so that the outer grinding disc 31 moves up and down relative to the inner grinding head 2 to change the position between the two, thereby adjusting the coarseness of the ground powder. When in use, the rotating member 4 can be rotated to drive the grinding disc seat 32 to move up and down, so as to change the position between the outer grinding disc 31 and the inner grinding head 2 to adjust the coarseness of the ground powder.

[0048] Specifically, the rotating member 4 includes a first rotating sleeve 41, which is provided with an internal thread 411, and the grinding disc seat 32 is provided with an external thread 3221 that cooperates with the internal thread 411; when the first rotating sleeve 41 rotates, the grinding disc seat 32 moves up and down through the thread cooperation between the external thread 3221 and the internal thread 411.

[0049] Specifically, the rotating member 4 also includes a second rotating sleeve 42, the second rotating sleeve 42 is provided with a first tooth-shaped clamping position 421, and the first rotating sleeve 41 is provided with a second tooth-shaped clamping position 412. The first tooth-shaped clamping position 421 is engaged with the second tooth-shaped clamping position 412 to connect the first rotating sleeve 41 and the second rotating sleeve 42 together; when the second rotating sleeve 42 rotates, it can drive the first rotating sleeve 41 to rotate, and then drive the grinding disc seat 32 to move up and down.

[0050] See also Figure 1-8 The grinding chamber 11 includes a first chamber 111 and a second chamber 112. The first chamber 111 is annular and is used for rough grinding, and the second chamber 112 is annular and is used for fine grinding. The inner grinding head 2 is provided with inner grinding coarse teeth 21 and inner grinding fine teeth 22 arranged up and down, and the outer grinding disc 31 is provided with outer grinding coarse teeth 311 and outer grinding fine teeth 312 arranged up and down; the first chamber 111 is formed between the inner grinding coarse teeth 21 and the outer grinding coarse teeth 311, and the second chamber 112 is formed between the inner grinding fine teeth 22 and the outer grinding fine teeth 312.

[0051] Specifically, a discharge port 113 and a powder discharge channel 17 connected to the discharge port 113 are further provided on one side of the grinding chamber 11. When in use, the coffee beans fall into the powder discharge channel 17 from the discharge port 113 on one side of the grinding chamber 11 after coarse grinding and fine grinding and are discharged.

[0052] See also Figure 4 , Fig.10 The coffee bean grinding device of the utility model also includes a driving assembly, which includes a driving motor 12 and a transmission shaft 14 arranged on the grinding bracket 1; the output shaft of the driving motor 12 and one end of the transmission shaft 14 are both transmission-connected to the transmission box 13, and the other end of the transmission shaft 14 extends into the grinding chamber 11, wherein the inner grinding head 2 is provided with a through hole 23, and the through hole 23 of the inner grinding head 2 is sleeved on the other end of the transmission shaft 14 to be installed on the transmission shaft 14, and realizes transmission connection, so that the inner grinding head 2 rotates to realize grinding.

[0053] It should be noted that, in the present embodiment, the transmission box 13 is a gear box, the output shaft of the driving motor 12 and one end of the transmission shaft 14 are both inserted into the gear box, and the torque of the driving motor 12 is amplified by the gear box and transmitted to the inner grinding head 2 through the transmission shaft 14, thereby avoiding the inner grinding head 2 and the outer grinding disc 31 from getting stuck with the coffee beans due to insufficient torque during the grinding process.

[0054] The coffee bean grinding device of the utility model further includes a locking nut 141, and the driving assembly further includes a material-dispensing member 15 sleeved on the transmission shaft 14 and located at the bottom of the inner grinding head 2, a convex column 151 is provided on the top of the material-dispensing member 15, and a concave hole 24 for inserting the convex column 151 is provided at the bottom of the inner grinding head 2; when the inner grinding head 2 is sleeved on the other end of the transmission shaft 14, the convex column 151 is engaged with the concave hole 24; the locking nut 141 locks the inner grinding head 2 and the material-dispensing member 15, so that the inner grinding head 2 is fixed to the other end of the transmission shaft 14. This avoids the phenomenon that the inner grinding head 2 rotates relative to the transmission shaft 14 during rotation and grinding, resulting in failure to grind.

[0055] Of course, the top of the transmission shaft 14 is connected with a locking nut 141 for locking the inner grinding head 2 and the material-shifting member 15. Specifically, a gasket 143 and an elastic washer 142 for preventing the locking nut 141 from loosening are also provided between the locking nut 141 and the inner grinding head 2.

[0056] It should be noted that when the bean grinding device for a coffee machine of the utility model is in use, the coffee beans are pre-dropped into a first chamber 111 formed between the inner coarse grinding teeth 21 and the outer coarse grinding teeth 311, and the driving motor 12 drives the transmission shaft 14 to rotate through the transmission box 13, thereby driving the inner grinding head 2 and the material shifting member 15 to rotate. Under the action of the inner coarse grinding teeth 21 of the inner grinding head 2 and the outer coarse grinding teeth 311 of the outer grinding disc 31, the coffee beans are coarsely ground and fall into a second chamber 112 formed between the inner fine grinding teeth 22 and the outer fine grinding teeth 312. After fine grinding under the action of the inner fine grinding teeth 22 of the inner grinding head 2 and the outer fine grinding teeth 312 of the outer grinding disc 31, the material shifting member 15 rotates to shift the coffee powder into the discharge port 113, and the coffee powder falls into the powder discharge channel 17.

[0057] Among them, when it is necessary to adjust the grinding coarseness of the coffee powder, the user can rotate the second rotating sleeve 42. The second rotating sleeve 42 rotates and drives the first rotating sleeve 41 to rotate under the engagement of the first tooth-shaped position 421 and the second tooth-shaped position 412. The internal thread 411 on the first rotating sleeve 41 cooperates with the external thread 3221 on the grinding disc seat 32, which can drive the grinding disc seat 32 and the outer grinding disc 31 that is an integral structure with the grinding disc seat 32 to move up and down, and then adjust the interval between the outer grinding disc 31 and the inner grinding head 2 to change the grinding coarseness of the coffee powder.

[0058] In summary, in the bean grinding device for a coffee machine of the utility model, the outer grinding disc 31 and the grinding disc seat 32 are integrally formed, which not only simplifies the processing technology and assembly process, but also has a simple structure, significantly reduces the manufacturing cost, and improves the user experience. In addition, since the grinding disc seat 32 and the grinding bracket 1 are connected and fixed by a plug-in structure, it is convenient for the user to disassemble the grinding disc seat 32 and clean the grinding chamber 11 and the outer grinding disc 31. At the same time, it also avoids the matching error between the outer grinding disc 31 and the grinding disc seat 32 during the assembly process, thereby affecting the coarseness of the ground powder.

[0059] The grinding disc seat 32 and the first rotating sleeve 41 are threadedly matched. When the first rotating sleeve 41 is rotated, the grinding disc seat 32 is driven to move up and down under the action of the threaded match, so that the position of the outer grinding disc 31 relative to the inner grinding head 2 is changed, thereby adjusting the coarseness of the ground powder. Therefore, the positional relationship between the outer grinding disc 31 and the inner grinding head 2 is adjusted by threaded match, which improves the adjustment accuracy and facilitates the user to fine-tune the coarseness of the powder. At the same time, since the grinding disc seat 32 and the first rotating sleeve 41 are threadedly matched, it is also convenient for the user to disassemble and assemble the bean grinding device, and then clean and clean the bean grinding device.

[0060] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0061] It should be understood that the orientations or positional relationships indicated by the terms "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the modules or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0062] In addition, in the description of the present utility model, "multiple" and "several" mean two or more than two, unless otherwise clearly and specifically defined.

[0063] The technical means disclosed in the solution of the utility model are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims

1. A coffee bean grinding device for a coffee machine, It is characterized in that include: A grinding support, which is provided with a grinding chamber; An inner grinding head, which is arranged in the grinding chamber; An outer grinding disc assembly, which is arranged on the grinding bracket and cooperates with the inner grinding head; Among them, the outer grinding disc assembly includes an outer grinding disc and a grinding disc seat, and the outer grinding disc and the grinding disc seat are integrally formed; the grinding disc seat and the grinding bracket are connected and fixed by a plug-in structure.

2. The coffee bean grinding device for a coffee machine according to claim 1, It is characterized in that The plug-in structure includes a first plug-in portion arranged on the outer side of the grinding disc seat and a second plug-in portion arranged on the grinding bracket. The first plug-in portion is plug-connected with the second plug-in portion to connect and fix the grinding disc seat to the grinding bracket.

3. The coffee bean grinding device for a coffee machine according to claim 2, It is characterized in that One of the first plug-in portion and the second plug-in portion is an insert block, and the other of the first plug-in portion and the second plug-in portion is a slot.

4. The coffee bean grinding device for a coffee machine according to any one of claims 1 to 3, It is characterized in that It also includes a rotating part, which can drive the grinding disc seat to move up and down when it rotates, so that the outer grinding disc moves up and down relative to the inner grinding head to change the position between the two, thereby achieving the adjustment of the coarseness of the ground powder.

5. The coffee bean grinding device for a coffee machine according to claim 4, It is characterized in that The rotating member comprises a first rotating sleeve, the first rotating sleeve is provided with an internal thread, and the grinding disc seat is provided with an external thread matching the internal thread; When the first rotating sleeve rotates, the grinding disc seat moves up and down through the thread cooperation between the external thread and the internal thread.

6. The coffee bean grinding device for a coffee machine according to claim 5, It is characterized in that The rotating member further comprises a second rotating sleeve, the second rotating sleeve is provided with a first tooth-shaped retaining position, the first rotating sleeve is provided with a second tooth-shaped retaining position, the first tooth-shaped retaining position is meshed with the second tooth-shaped retaining position to connect the first rotating sleeve with the second rotating sleeve; When the second rotating sleeve rotates, the first rotating sleeve rotates through the meshing of the first tooth-shaped clamping position and the second tooth-shaped clamping position.

7. The coffee bean grinding device for a coffee machine according to any one of claims 1 to 3, It is characterized in that The grinding chamber includes a first chamber and a second chamber. The first chamber is annular and is used for coarse grinding, and the second chamber is annular and is used for fine grinding.

8. The coffee bean grinding device for a coffee machine according to claim 7, It is characterized in that The inner grinding head is provided with inner grinding coarse teeth and inner grinding fine teeth arranged up and down, and the outer grinding disc is provided with outer grinding coarse teeth and outer grinding fine teeth arranged up and down; The first chamber is formed between the inner coarse grinding teeth and the outer coarse grinding teeth, and the second chamber is formed between the inner fine grinding teeth and the outer fine grinding teeth.

9. The coffee bean grinding device for a coffee machine according to any one of claims 1 to 3, It is characterized in that It also includes a driving assembly and a transmission box, wherein the driving assembly includes a driving motor and a transmission shaft arranged on the grinding bracket; the output shaft of the driving motor and one end of the transmission shaft are both transmission-connected to the transmission box; The other end of the transmission shaft extends into the grinding chamber, and the inner grinding head is sleeved on the other end of the transmission shaft to achieve grinding.

10. The coffee bean grinding device for a coffee machine according to claim 9, It is characterized in that It also includes a locking nut, and the driving assembly also includes a material removing member sleeved on the other end of the transmission shaft and located at the bottom of the inner grinding head; A convex column is provided on the top of the material-push piece, and a concave hole is provided at the bottom of the inner grinding head, and the convex column is engaged with the concave hole; the locking nut locks the inner grinding head and the material-push piece to fix the inner grinding head to the other end of the transmission shaft.

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