Bean grinder

Abstract

The utility model relates to the technical field of household appliances, and discloses a bean grinder which comprises a grinder body, an outer cutter head, a bottom cover, a main shaft and an inner cutter head, a first mounting cavity is formed in the machine body; the outer cutter head is detachably mounted on the machine body and located in the first mounting cavity, and a grinding cavity is formed in the outer cutter head; the bottom cover is detachably mounted on the machine body; when the bottom cover is mounted on the machine body, the outer cutter head is positioned between the top wall of the first mounting cavity and the bottom cover; when the bottom cover is detached relative to the machine body, the outer cutter head can move out of the first mounting cavity; the spindle is rotationally connected to the body; the inner cutter head is connected to one end of the main shaft and located in the grinding cavity. Through the arrangement, the technical problem that in the prior art, an outer cutter head cannot be disassembled or is difficult to disassemble and assemble is solved.

Description

Technical Field

[0001] This utility model relates to the field of household appliance technology, and in particular to a coffee grinder. Background Technology

[0002] Currently, coffee grinders can be used to grind beans, such as coffee beans, so that users can make their own coffee in their daily lives.

[0003] In related technologies, a coffee grinder includes a body, an inner blade disc, and an outer blade disc. The inner blade disc is rotatably connected to the body and can be manually driven by the user via a joystick or by a motor. The outer blade disc is mounted on the body. The outer blade disc has a grinding chamber, and the inner blade disc is placed inside the grinding chamber. Blades are provided on the outer side of the inner blade disc and the inner wall of the grinding chamber. When the inner blade disc rotates relative to the body, the blades on the inner blade disc and the blades inside the grinding chamber can grind the beans in the grinding chamber. The ground bean powder is discharged from the bottom of the grinding chamber.

[0004] However, after grinding beans, the blades on the inner wall of the grinding chamber may be worn or have bean scraps attached to their surface, requiring the outer blade disc to be disassembled from the machine body. In general, the outer blade disc is integrally formed with the machine body, or the outer blade disc is connected to the machine body through multiple parts, making it impossible to disassemble the outer blade disc or difficult to disassemble and assemble. Utility Model Content

[0005] The present invention aims to provide a coffee grinder to solve the technical problem that the outer blade disc cannot be disassembled or is difficult to disassemble in the prior art.

[0006] The technical problem solved by this utility model embodiment is addressed by the following technical solution:

[0007] A coffee grinder is provided, comprising:

[0008] The fuselage has a first mounting cavity;

[0009] An outer blade disc is mounted on the machine body and located within the first mounting cavity, and the outer blade disc has a grinding chamber.

[0010] A bottom cover is detachably mounted to the machine body; when the bottom cover is mounted to the machine body, the outer cutter disc is located between the top wall of the first mounting cavity and the bottom cover; when the bottom cover is detached from the machine body, the outer cutter disc can be moved out of the first mounting cavity.

[0011] The main shaft is rotatably connected to the machine body;

[0012] An inner cutter disc is connected to one end of the spindle and is located inside the grinding chamber.

[0013] In some embodiments, the inner cutter disc is detachably connected to the spindle; the cross-sectional area of ​​the grinding chamber gradually increases in the direction from the outer cutter disc to the bottom cover, and the cross-sectional area of ​​the inner cutter disc also gradually increases.

[0014] In some embodiments, the machine body includes a main body and an adjustment knob. The adjustment knob is rotatably connected to the outer peripheral side of the main body. The first mounting cavity is formed within the space enclosed by the adjustment knob. The rotation axis of the adjustment knob is collinear with the rotation axis of the main shaft. The adjustment knob is sleeved on the outer cutter disc, and the inner surface of the adjustment knob is threadedly connected to the outer surface of the outer cutter disc. The main body includes a guide member, and the outer cutter disc has a guide groove. The guide member is embedded in the corresponding guide groove.

[0015] During the rotation of the adjustment knob, along the rotation axis of the adjustment knob, the adjustment knob drives the outer cutter disc to move relative to the main body, and the guide member moves within the guide groove.

[0016] In some embodiments, the outer cutter disc includes at least two side protrusions protruding from the outer surface of the outer cutter disc; the inner surface of the adjusting knob is threadedly connected to the side of the side protrusions opposite to the central axis of the outer cutter disc; all the side protrusions are circumferentially distributed on the outer cutter disc, and the guide groove is formed between two adjacent side protrusions.

[0017] In some embodiments, the grinder further includes connectors, each of the guides corresponding to one connector, and the bottom cover is detachably mounted to the guides via the connectors.

[0018] In some embodiments, the connector is a screw, and each guide has a threaded hole on its bottom surface. The connector is threadedly connected to a corresponding guide and is located at the center of the bottom surface of the corresponding guide.

[0019] In some embodiments, the outer blade disc includes a body and a connecting portion, the body having the grinding chamber, the side protrusion protruding from the outer surface of the connecting portion, and the connecting portion being detachably connected to the outer surface of the body.

[0020] In some embodiments, the grinder further includes an elastic element, the spindle includes a limiting step facing the inner blade disc, one end of the elastic element abuts against the limiting step, and the other opposite end of the elastic element abuts against the inner blade disc, the elastic element being in an elastically compressed state.

[0021] In some embodiments, the grinder further includes a drive assembly mounted on the machine body. The spindle includes a rotation limiter located at the end of the spindle away from the inner blade disc. The drive assembly has a rotation guide groove. The rotation limiter is inserted into the rotation guide groove so that the drive assembly can drive the spindle to rotate.

[0022] In some embodiments, the housing includes a second mounting bracket, and the housing also has a second mounting cavity. The second mounting cavity is located above the first mounting cavity, and the second mounting bracket is located inside the second mounting cavity. The main shaft passes through the second mounting bracket and is rotatably connected to the second mounting bracket.

[0023] Compared to existing technologies, the inner blade rotates relative to the outer blade, and the blade structures on both the outer and inner blades can grind the beans located in the grinding chamber. During the grinding process, the blades on the outer blade may become dull or worn, resulting in a decrease in the grinding effect of the grinder, which requires the user to replace the outer blade.

[0024] When replacing the outer cutter head, the user first removes the bottom cover from the machine body so that the outer cutter head can be moved out of the first mounting cavity. Then, the outer cutter head is removed from the first mounting cavity, and the new outer cutter head is installed in the first mounting cavity. Finally, the bottom cover is connected to the machine body so that the new outer cutter head can be stably placed in the first mounting cavity. The number of parts that need to be operated during the process of removing and installing the outer cutter head from the machine body is small, making it more convenient. Attached Figure Description

[0025] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings do not constitute a limitation on scale.

[0026] Figure 1 This is a perspective view of a coffee grinder in one embodiment of this utility model;

[0027] Figure 2 This is a perspective view of the coffee grinder body, outer blade, and bottom cover separated from each other in another embodiment of this utility model;

[0028] Figure 3 yes Figure 2 A 3D view of the coffee grinder body and bottom cover separated from each other;

[0029] Figure 4 yes Figure 2 A 3D view of the coffee grinder body and inner blades when they are separated;

[0030] Figure 5 yes Figure 1 A cross-sectional view of the outer blade of a coffee grinder;

[0031] Figure 6 yes Figure 1 A 3D view of the coffee grinder's adjustment knob and outer blades when they are separated;

[0032] Figure 7 yes Figure 1 A partial sectional view of the coffee grinder in the image;

[0033] Figure 8 yes Figure 1 A partial schematic diagram of the main shaft and drive assembly of a coffee grinder when they are separated.

[0034] Figure label:

[0035] 100. Coffee grinder; 10. Machine body; 12. Main body; 122. Guide component; 14. Adjustment knob; 16. Mounting bracket; 102. First mounting cavity; 104. Second mounting cavity; 20. Outer blade; 22. Main body; 2202. Grinding cavity; 24. Connecting part; 242. Side protrusion; 202. Guide groove; 30. Bottom cover; 302. Positioning groove; 40. Spindle; 42. Limiting step; 44. Rotation limiting component; 50. Inner blade; 60. Connecting component; 70. Elastic component; 80. Drive assembly; 802. Rotation guide groove. Detailed Implementation

[0036] To facilitate understanding of this utility model, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as "connected" to another element, it can be directly on the other element, or one or more intermediate elements can exist between them. The terms "upper," "lower," "left," "right," "upper end," "lower end," "top," and "bottom," etc., used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

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

[0038] The following detailed description of a coffee grinder 100 provided in this application, with reference to all the accompanying drawings, and through specific embodiments, will be provided in detail.

[0039] Please refer to Figure 1 , Figure 2 and Figure 3 One embodiment of this utility model discloses a coffee grinder 100, including a body 10, an outer blade disc 20, a bottom cover 30, a main shaft 40, and an inner blade disc 50; the body 10 has a first mounting cavity 102; the outer blade disc 20 is detachably mounted on the body 10 and located in the first mounting cavity 102, and the outer blade disc 20 has a grinding cavity 2202; the bottom cover 30 is detachably mounted on the body 10; when the bottom cover 30 is mounted on the body 10, the outer blade disc 20 is located between the top wall of the first mounting cavity 102 and the bottom cover 30; when the bottom cover 30 is detached from the body 10, the outer blade disc 20 can be moved out of the first mounting cavity 102; the main shaft 40 is rotatably connected to the body 10; the inner blade disc 50 is connected to one end of the main shaft 40 and is located in the grinding cavity 2202.

[0040] With the above structure, the inner blade 50 rotates relative to the outer blade 20. The blade structure on the outer blade 20 and the blade structure on the inner blade 50 can grind the beans located in the grinding chamber 2202. During the grinding process, the blades on the outer blade 20 may become dull or worn, which will reduce the grinding effect of the grinder 100 on the beans, and the user will need to replace the outer blade 20.

[0041] During the replacement of the outer cutter head 20, the user first removes the bottom cover 30 from the machine body 10 so that the outer cutter head 20 can be moved out of the first mounting cavity 102. Then, the outer cutter head 20 is removed from the first mounting cavity 102, and the new outer cutter head 20 is installed in the first mounting cavity 102. Finally, the bottom cover 30 is connected to the machine body 10 so that the new outer cutter head 20 can be stably placed in the first mounting cavity 102. The number of parts that need to be operated during the disassembly and assembly of the outer cutter head 20 from the machine body 10 is small, making it more convenient.

[0042] Specifically, in this embodiment, the body 10 has a hollow structure similar to a cylinder, and the first mounting cavity 102 is located at the lower end of the body 10; the outer blade disc 20 has a cylindrical structure, and the grinding cavity 2202 can be cylindrical or frustum-shaped. The shape of the inner blade disc 50 is adapted to the shape of the grinding cavity 2202. One end of the grinding cavity 2202 passes through the upper end of the outer blade disc 20, and the other opposite end of the grinding cavity 2202 passes through the lower end of the outer blade disc 20; inclined blades are provided on the outer side of the inner blade disc 50 and the inner side of the outer blade disc 20. The outer blade disc 20 is threadedly connected to the body 10, and the outer blade disc 20 can be rotated relative to the body 10 to allow it to enter or exit the first mounting cavity 102.

[0043] The bottom cover 30 is a plate-like structure similar to a ring. The hollow part of the bottom cover 30 is connected to the grinding chamber 2202 so that the bean particles formed after the beans are ground can fall down. The bottom cover 30 can be connected to the lower end of the machine body 10 by screws or other parts. The outer blade disc 20 can move vertically relative to the machine body 10 or can be fixed inside the machine body 10.

[0044] The main shaft 40 is installed inside the machine body 10. The main shaft 40 can be rotatably connected to the machine body 10 through bearings. The lower end of the main shaft 40 is connected to the inner cutter head 50, and the upper end of the main shaft 40 can be connected to a drive motor or a rocker arm. The drive motor or rocker arm can drive the inner cutter head 50 to rotate relative to the machine body 10 through the main shaft 40.

[0045] In other embodiments, the body 10 may also be other structures, such as a cuboid; the outer blade disc 20 and the body 10 may also be detachably connected in other ways, such as by snap-fit ​​or by pin connection; the bottom cover 30 may also be other shapes, such as a hollow rectangular plate structure.

[0046] Please refer to Figure 4 In some embodiments, the inner cutter head 50 is detachably connected to the spindle 40; the cross-sectional area of ​​the grinding chamber 2202 gradually increases in the direction from the outer cutter head 20 to the bottom cover 30, and the cross-sectional area of ​​the inner cutter head 50 also gradually increases.

[0047] With the above structure, the cross-sectional area of ​​the grinding chamber 2202 gradually increases from the outer blade disc 20 to the bottom cover 30, and the cross-sectional area of ​​the inner blade disc 50 also gradually increases, so that the beans fall at an angle within the grinding chamber 2202, thereby allowing the beans to be ground more thoroughly. Furthermore, during the disassembly of the outer blade disc 20, the inner blade disc 50 must first be disassembled relative to the main shaft 40 and removed from the grinding chamber 2202. Then, the bottom cover 30 must be disassembled relative to the machine body 10, and finally, the outer blade disc 20 must be removed from the first mounting cavity 102.

[0048] Specifically, in this embodiment, the grinding chamber 2202 has a structure similar to a frustum; the main shaft 40 can be inserted into the inner cutter disc 50, and the outer side of the main shaft 40 and the inner cutter disc 50 can abut against each other through a limiting step, so that the main shaft 40 and the inner cutter disc 50 can rotate synchronously; the lower end of the main shaft 40 can be connected to a screw or nut, which can abut against the lower end of the inner cutter disc 50, so that the inner cutter disc 50 is fixed to the main shaft 40 in the vertical direction.

[0049] In other embodiments, the spindle 40 and the inner cutter head 50 can also be detachably connected in other directions. For example, the outer side of the spindle 40 is provided with external threads, and the inner cutter head 50 and the spindle 40 are threadedly connected.

[0050] Please refer to Figure 5 and Figure 6 In some embodiments, the machine body 10 includes a main body 12 and an adjustment knob 14. The adjustment knob 14 is rotatably connected to the outer peripheral side of the main body 12. A first mounting cavity 102 is formed within the space enclosed by the adjustment knob 14. The rotation axis of the adjustment knob 14 is collinear with the rotation axis of the main shaft 40. The adjustment knob 14 is sleeved on the outer cutter disc 20, and the inner surface of the adjustment knob 14 is threadedly connected to the outer surface of the outer cutter disc 20. The main body 12 includes a guide member 122. The outer cutter disc 20 has a guide groove 202, and the guide member 122 is embedded in the corresponding guide groove 202.

[0051] During the rotation of the adjustment knob 14, along the rotation axis of the adjustment knob 14, the adjustment knob 14 drives the outer cutter disc 20 to move relative to the main body 12, and the guide member 122 moves in the guide groove 202.

[0052] With the above structure, the user turns the adjustment knob 14, which rotates relative to the outer blade 20. At the same time, the guide 122 abuts against the groove wall of the guide groove 202 and guides and limits the outer blade 20. The outer blade 20 moves up or down relative to the main body 12 to adjust the distance between the inner blade and the outer blade, thereby adjusting the size of the particles formed after the beans are ground.

[0053] Specifically, the adjustment knob 14 is rotatably connected to the main body 12 via a bearing. The outer surface of the adjustment knob 14 protrudes from the outer side of the machine body 10, and the adjustment knob 14 is engraved with scales. The scales on the adjustment knob 14 are used for customers to observe and understand the size of the ground bean particles.

[0054] In some embodiments, the outer cutter head 20 includes at least two side protrusions 242, which protrude from the outer surface of the outer cutter head 20; the inner surface of the adjusting knob 14 is threadedly connected to the side of the side protrusion 242 opposite to the central axis of the outer cutter head 20; all the side protrusions 242 are circumferentially distributed on the outer cutter head 20, and the guide groove 202 is formed between two adjacent side protrusions 242.

[0055] With the above structure, the guide 122 can simultaneously abut against the outer surface of the side protrusion 242 and the outer blade 20, and the number of side protrusions 242 is equal to the number of guide grooves 202, so that there are at least two guides 122; so that the outer blade 20 can be more stable when it moves in the vertical direction relative to the main body 12, thereby improving the grinding accuracy of beans.

[0056] Specifically, in this embodiment, the guide 122 can be an arc-shaped block structure, and the side protrusion 242 is also an arc-shaped block structure. The height of the side protrusion 242 is less than the height of the guide 122. There are three side protrusions 242, and the spacing between two adjacent side protrusions 242 is equal.

[0057] Please refer to the following: Figure 3 In some embodiments, the grinder 100 also includes a connector 60, with each guide 122 corresponding to a connector 60, and the bottom cover 30 is detachably mounted to the guide 122 via the connector 60.

[0058] With the above structure, each guide member 122 corresponds to a connector 60, so that the bottom cover 30 can be fixed relative to each guide member 122, and the bottom cover 30 can be more stably connected to the lower end of the body 10.

[0059] Specifically, in this embodiment, the connector 60 is a screw; in other embodiments, the connector 60 may be other structures, such as a plug or a snap-fit ​​connector.

[0060] In some embodiments, the connector 60 is a screw, and a threaded hole is provided on the bottom surface of each guide 122. The connector 60 is threadedly connected to a corresponding guide 122, and the connector 60 is located in the middle of the bottom surface of the corresponding guide 122.

[0061] With the above structure, the connector 60 and the guide 122 are connected by threads, making the disassembly and assembly of the bottom cover 30 more convenient. In addition, the connector 60 is located in the middle of the bottom surface of the guide 122, so that the guide 122 can provide more stable support for the bottom cover 30 through the connector 60, reducing the possibility of the bottom cover 30 becoming loose relative to the guide 122.

[0062] Specifically, the bottom of the bottom cover 30 is provided with multiple positioning grooves 302, the shape of which is adapted to the shape of the nut of the connector 60; the connector 60 passes through the bottom cover 30, and the nut of each connector 60 is placed in a corresponding positioning groove 302, and the nut of the connector 60 abuts against the groove wall of the corresponding positioning groove 302.

[0063] In some embodiments, the outer blade disc 20 includes a body 22 and a connecting portion 24. The body 22 has a grinding cavity 2202, and a side protrusion 242 protrudes from the outer surface of the connecting portion 24. The connecting portion 24 is detachably connected to the outer surface of the body 22.

[0064] With the above structure, the connecting part 24 is detachably connected to the outer surface of the body 22, and the outer blade disc 20 can be replaced with different models of body 22 so that the size of the blade connected to the cavity wall of the grinding chamber 2202 can be changed according to the requirements.

[0065] Specifically, in this embodiment, both the connecting part 24 and the body 22 have a ring-like structure. The connecting part 24 is sleeved on the outer surface of the body 22, and the connecting part 24 and the body 22 can be detachably connected to each other by a snap-fit ​​method. The connecting part 24 also includes a frame structure, which is located above the body 22 and above the inner cutter head 50. The rotation shaft of the inner cutter head 50 passes through the frame structure.

[0066] In other embodiments, the connecting part 24 and the body 22 can also be detachably connected in other ways, such as by screws.

[0067] Please refer to Figure 7 In some embodiments, the grinder 100 further includes an elastic element 70, the spindle 40 includes a limiting step 42 facing the inner blade 50, one end of the elastic element 70 abuts against the limiting step 42, and the other opposite end of the elastic element 70 abuts against the inner blade 50, and the elastic element 70 is in an elastically compressed state.

[0068] With the above structure, when the inner blade disc 50 is disassembled relative to the main shaft 40, the elastic element 70 can provide a downward elastic force to the inner blade disc 50, so that the inner blade disc 50 can more easily detach from the main shaft 40 and fall out of the grinding chamber, thus preventing the inner blade disc 50 from getting stuck in the grinding chamber.

[0069] Specifically, in this embodiment, the limiting step 42 is annular and perpendicular to the rotation axis of the main shaft 40. The elastic element 70 is a spring structure, which is sleeved on the lower end of the main shaft 40 and the lower end of the elastic element 70 abuts against the upper surface of the inner cutter disc 50.

[0070] In other embodiments, the elastic element 70 may also be other elastic structures, such as a spring sheet.

[0071] In some embodiments, the housing 10 includes a second mounting bracket 16 and a second mounting cavity 104. The second mounting cavity 104 is located above the first mounting cavity 102. The second mounting bracket 16 is located inside the second mounting cavity 104. The main shaft 40 passes through the second mounting bracket 16 and is rotatably connected to the second mounting bracket 16.

[0072] With the above structure, the mounting bracket 16 is used for rotatably connecting the main shaft 40, and the main shaft 40 passes through the second mounting bracket 16. The mounting bracket 16 is located in the middle of the main shaft 40. The mounting bracket 16 can support the main shaft 40 more stably, so that the main shaft 40 can rotate more stably.

[0073] Specifically, in this embodiment, the second mounting bracket 16 may include a sheet-like support structure connected to the inner wall of the second mounting cavity 104, and the sheet-like support structure is circumferentially distributed around the periphery of the second mounting bracket 16.

[0074] In other embodiments, the second mounting bracket 16 may also have other structures, such as the second mounting bracket 16 being a block-shaped structure.

[0075] Please refer to Figure 1 and Figure 8 In some embodiments, the grinder 100 further includes a drive assembly 80, which is mounted on the body 10. The spindle 40 includes a rotation limiter 44 located at one end of the spindle 40 away from the inner blade disc 50. The drive assembly 80 has a rotation guide groove 802. The rotation limiter 44 is inserted into the rotation guide groove 802 so that the drive assembly 80 can drive the spindle 40 to rotate.

[0076] With the above structure, the drive assembly 80 and the spindle 40 are connected by inserting a rotation limiting member 44 into the rotation guide groove 802, so as to make the assembly process of the grinder 100 more convenient; and after the rotation limiting member 44 is inserted into the rotation guide groove 802, the groove wall of the rotation guide groove 802 can circumferentially limit the rotation limiting member 44, so that the drive assembly 80 can drive the spindle 40 to rotate.

[0077] Specifically, in this embodiment, the drive assembly 80 may include a motor; the rotation limiting member 44 may be a hexagonal prism structure, located at the upper end of the main shaft 40, and the shape of the rotation guide groove 802 is adapted to the shape of the rotation limiting member 44. In other embodiments, the drive assembly 80 may also be other structures, such as a manual joystick; the rotation limiting member 44 may also be other shapes, such as a cuboid or a "D"-shaped prism.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; under the concept of this utility model, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this utility model as described above. For the sake of brevity, they are not provided in detail; although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A coffee grinder, characterized in that, include: The fuselage has a first mounting cavity; An outer blade disc is mounted on the machine body and located within the first mounting cavity, and the outer blade disc has a grinding chamber. A bottom cover is detachably mounted to the machine body; when the bottom cover is mounted to the machine body, the outer cutter disc is located between the top wall of the first mounting cavity and the bottom cover; when the bottom cover is detached from the machine body, the outer cutter disc can be moved out of the first mounting cavity. The main shaft is rotatably connected to the machine body; An inner cutter disc is connected to one end of the spindle and is located inside the grinding chamber.

2. The coffee grinder according to claim 1, characterized in that, The inner cutter disc is detachably connected to the spindle; in the direction from the outer cutter disc to the bottom cover, the cross-sectional area of ​​the grinding chamber gradually increases, and the cross-sectional area of ​​the inner cutter disc also gradually increases.

3. The coffee grinder according to claim 1, characterized in that, The machine body includes a main body and an adjustment knob. The adjustment knob is rotatably connected to the outer peripheral side of the main body. The first mounting cavity is formed within the space enclosed by the adjustment knob. The rotation axis of the adjustment knob is collinear with the rotation axis of the main shaft. The adjustment knob is sleeved on the outer cutter disc, and the inner surface of the adjustment knob is threadedly connected to the outer surface of the outer cutter disc. The main body includes a guide member, and the outer cutter disc has a guide groove. The guide member is embedded in the corresponding guide groove. During the rotation of the adjustment knob, along the rotation axis of the adjustment knob, the adjustment knob drives the outer cutter disc to move relative to the main body, and the guide member moves within the guide groove.

4. The coffee grinder according to claim 3, characterized in that, The outer cutter disc includes at least two side protrusions that protrude from the outer surface of the outer cutter disc; the inner surface of the adjusting knob is threadedly connected to the side of the side protrusions that is away from the central axis of the outer cutter disc; all the side protrusions are circumferentially distributed on the outer cutter disc, and the guide groove is formed between two adjacent side protrusions.

5. The coffee grinder according to claim 4, characterized in that, It also includes connectors, with each guide corresponding to one connector, and the bottom cover is detachably mounted to the guide via the connectors.

6. The coffee grinder according to claim 5, characterized in that, The connector is a screw, and each guide has a threaded hole on its bottom surface. The connector is threaded to a corresponding guide and is located in the middle of the bottom surface of the corresponding guide.

7. The coffee grinder according to claim 4, characterized in that, The outer blade disc includes a body and a connecting part. The body has the grinding cavity, the side protrusion protrudes from the outer surface of the connecting part, and the connecting part is detachably connected to the outer surface of the body.

8. The coffee grinder according to claim 2, characterized in that, It also includes an elastic element. The spindle includes a limiting step facing the inner cutter disc. One end of the elastic element abuts against the limiting step, and the other opposite end of the elastic element abuts against the inner cutter disc. The elastic element is in an elastically compressed state.

9. The coffee grinder according to claim 1, characterized in that, It also includes a drive assembly, which is mounted on the machine body. The spindle includes a rotation limiter located at the end of the spindle away from the inner cutter head. The drive assembly has a rotation guide groove. The rotation limiter is inserted into the rotation guide groove so that the drive assembly can drive the spindle to rotate.

10. The coffee grinder according to claim 1, characterized in that, The machine body includes a second mounting bracket, and the machine body also has a second mounting cavity. The second mounting cavity is located above the first mounting cavity, and the second mounting bracket is located inside the second mounting cavity. The main shaft passes through the second mounting bracket and is rotatably connected to the second mounting bracket.

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