Bean grinder capable of adjusting thickness grinding degree

Abstract

The utility model relates to a bean grinder capable of adjusting thickness and grinding degree, which belongs to the technical field of bean grinding instruments and comprises an inner casing and a grinding head adjusting device, the inner casing is vertically through, a driving shaft is rotatably arranged in the inner casing, a grinding head is arranged at one end of the driving shaft, and a grinding base plate is arranged at the bottom of the inner casing. A grinding gap can be reserved between the grinding head and the grinding base plate; the grinding head adjusting device comprises a first adjusting assembly arranged on the inner side of the inner shell and rotationally connected with the driving shaft in the radial direction, and a second adjusting assembly arranged on the outer side of the inner shell, making contact with the first adjusting assembly and capable of driving the first adjusting assembly to ascend and descend. The first adjusting assembly can be driven to ascend and descend through the second adjusting assembly, so that the first adjusting assembly is driven to ascend and descend, and due to the fact that the first adjusting assembly is rotationally connected with the driving shaft in the radial direction, the driving shaft drives the grinding head to ascend and descend so as to control the size of a grinding gap between the grinding head and the grinding base plate.

Description

Technical Field

[0001] The utility model relates to the technical field of bean grinding equipment, and more specifically to a bean grinder capable of adjusting the coarse and fine grinding degree. Background Art

[0002] In China, coffee, as an imported product, has won the favor of more and more consumers in recent years. Consumers are concerned about the hygiene, water ratio, freshness index, and degree of cooking of coffee sold publicly on the market. Therefore, many families begin to consider buying coffee grinders. In China, coffee grinders are widely used in many urban households as a fashionable and practical home appliance.

[0003] Traditional bean grinders do not have the function of adjusting the coarseness of the grinds, because different types of coffee and different extraction methods require coffee powder of different coarseness. For example, espresso needs to be extracted under high pressure, so finer coffee powder is needed to better extract the flavor components in the coffee. Extraction methods such as hand pouring or French pressing may require slightly coarser coffee powder. If the bean grinder cannot adjust the coarseness of the grind, the coffee produced may not achieve the best taste and extraction effect. Secondly, factors such as the humidity, freshness and storage time of the coffee beans will affect the grinding effect. If the grinding coarseness cannot be adjusted, then in the face of these changes, the bean grinder will not be able to make adaptive adjustments, which may cause the coffee powder to be too fine or too coarse, thus affecting the taste and quality of the coffee. Utility Model Content

[0004] The technical problem to be solved by the utility model is that different types of coffee and different extraction methods require coffee powder of different coarseness. For example, espresso needs to be extracted under high pressure, so finer coffee powder is needed to better extract the flavor components in the coffee. Extraction methods such as hand brewing or French press may require slightly coarser coffee powder. If the bean grinder cannot adjust the grinding coarseness, the produced coffee may not achieve the best taste and extraction effect. Secondly, factors such as the humidity, freshness and storage time of the coffee beans will affect the grinding effect. If the grinding coarseness cannot be adjusted, then in the face of these changes, the bean grinder cannot be adaptively adjusted, which may cause the coffee powder to be too fine or too coarse, thereby affecting the taste and quality of the coffee. A bean grinder with adjustable coarseness and fineness is provided.

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

[0006] A coffee bean grinder with adjustable coarse and fine grinding degree is constructed, comprising an inner shell, the inner shell being connected from top to bottom, a driving shaft being rotatably arranged in the inner shell, a grinding head being arranged at one end of the driving shaft, a grinding bottom plate being arranged at the bottom of the inner shell, and a grinding gap being reserved between the grinding head and the grinding bottom plate;

[0007] The grinding head adjustment device includes a first adjustment component arranged on the inner side of the inner shell and radially connected to the drive shaft for rotation, and a second adjustment component arranged on the outer side of the inner shell and in contact with the first adjustment component and capable of driving the first adjustment component to be lifted and lowered.

[0008] Preferably, the first adjustment component includes a rotating connection member radially rotatably connected to the driving shaft, and a linkage member is provided on the outer side wall of the rotating connection member, and the linkage member is in contact with the second adjustment component.

[0009] Preferably, the second adjustment component includes a rotating ring and a limiting component for limiting the up and down displacement of the rotating ring, and an internal thread is provided on the inner side wall of the rotating ring.

[0010] Preferably, a connecting groove is provided on the outer wall of the inner shell, and the linkage member includes an assembly ring, and a thread is provided on the outer wall of the assembly ring. The thread passes into the connecting groove and cooperates with the internal thread.

[0011] Preferably, an outer shell is sleeved on the outer side of the inner shell, and the outer shell is connected to the inner shell through a supporting connecting plate, the rotating ring includes an upper ring part and a lower ring part, the inner diameter and outer diameter of the upper ring part are larger than the inner diameter and outer diameter of the lower ring part, the internal thread is arranged on the inner side wall of the lower ring part, the lower ring part is arranged above the supporting connecting plate, and the bottom of the upper ring part is in contact with the top of the outer shell.

[0012] Preferably, it comprises a base, the top of the base is detachably connected to the bottom of the inner shell, and the bottom of the outer shell is in contact with the top of the base.

[0013] Preferably, the grinding chassis includes a grinding processing groove, and the inner side wall of the grinding processing groove is provided with an upper guide surface and a lower grinding surface, the upper guide surface can guide the target product to slide onto the grinding head, and the lower grinding surface can cooperate with the grinding head to grind the target product.

[0014] Preferably, the outer wall of the grinding chassis is concavely provided with a limiting groove, the inner wall of the inner shell is provided with a limiting block adapted to the limiting groove, the top of the grinding chassis is convexly provided with an assembly eave, the assembly eave is in contact with the top of the base, and the inner wall of the inner shell is provided with a tightening block that cooperates with the base to press against the assembly eave.

[0015] Preferably, a top cover is provided on the top of the inner shell, a slot is provided on the inner side wall of the inner shell, an assembly extension plate is extended downwardly from the top cover, a buckle head matched with the slot is provided on the side of the assembly extension plate close to the inner shell, a step-shaped limiting groove is provided on the top of the upper ring part, a limiting protrusion is provided on the side of the top cover close to the upper ring part, and the limiting protrusion is located in the step-shaped limiting groove to limit the rotating ring upward.

[0016] Preferably, a friction protrusion is provided on the inner side wall of the upper ring portion, and an elastic friction protrusion is provided on the side of the assembly extension plate close to the friction protrusion, and the elastic friction protrusion can cooperate with the protrusion to increase the resistance of the upper ring portion during rotation, and first limit stops are provided on both sides of the friction protrusion, and a second limit stop is provided on the side of the assembly extension plate close to the friction protrusion to cooperate with the first limit stop to limit the rotation of the rotating ring.

[0017] The beneficial effects of the utility model are as follows: the inner shell is connected from top to bottom, a driving shaft is rotatably arranged in the inner shell, a grinding head is arranged at one end of the driving shaft, a grinding chassis is arranged at the bottom of the inner shell, and a grinding gap is left between the grinding head and the grinding chassis; a grinding head adjustment device, the grinding head adjustment device includes a first adjustment component arranged in the inner shell and radially rotatably connected to the driving shaft, and a second adjustment component arranged on the outer side of the inner shell and in contact with the first adjustment member and capable of driving the first adjustment component to be lifted and lowered. When the utility model is used, the first adjustment component can be driven to be lifted and lowered by the second adjustment component, thereby driving the first adjustment component to be lifted and lowered. Since the first adjustment component is radially rotatably connected to the driving shaft, the driving shaft drives the grinding head to be lifted and lowered to control the size of the grinding gap between the grinding head and the grinding chassis, thereby achieving the purpose of adjusting the grinding coarseness of the target product. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the utility model will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work:

[0019] Figure 1 It is an overall explosion schematic diagram of the utility model.

[0020] Figure 2 This utility model Figure 1 An enlarged schematic diagram of part A.

[0021] Figure 3 It is an overall side schematic diagram of the utility model.

[0022] Figure 4 This utility model is Figure 3 Schematic diagram of the cross-section along line AA.

[0023] Figure 5 It is an overall axonometric schematic diagram of the utility model.

[0024] Figure 6 It is an overall exploded schematic diagram of the utility model from another angle.

[0025] The accompanying drawings are marked as follows:

[0026] 1. Inner shell; 102. Connecting slot; 103. Card slot; 104. Limit block;

[0027] 201.1, rotating connector; 201.21, assembly ring; 201.22, threaded teeth; 202.1, rotating ring; 202.11, internal thread; 202.12, upper ring portion; 202.13, lower ring portion; 202.14, stepped limiting groove; 202.15, friction convex portion;

[0028] 3. driving shaft; 301. grinding head; 302. positioning member; 303. clamping block;

[0029] 4. Grinding chassis; 401. Grinding processing groove; 401.1. Upper guide surface; 401.2. Lower grinding surface; 402. Limiting groove; 403. Assembly eaves;

[0030] 5. Grinding gap;

[0031] 6. Support connecting plate;

[0032] 7. Top cover; 701. Assembly extension plate; 702. Buckle head; 703. Position limiting convex portion; 704.1. Mounting hole; 704.2. Spring; 704.3. Friction column; 705. First position limiting stopper; 706. Second position limiting stopper;

[0033] 8. Base; 801. Mounting through hole;

[0034] 9. Shell. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0037] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0039] The utility model is implemented as follows Figure 1-Figure 6As shown in, it relates to a grinder with adjustable coarse and fine grinding degree, including an inner shell 1 and a grinding head adjustment device, wherein the inner shell 1 is through-through from top to bottom, a driving shaft 3 is rotatably arranged in the inner shell 1, a grinding head 301 is arranged at one end of the driving shaft 3, a grinding chassis 4 is arranged at the bottom of the inner shell 1, and a grinding gap 5 is left between the grinding head 301 and the grinding chassis 4; a grinding head adjustment device, the grinding head adjustment device includes a first adjustment component arranged in the inner shell 1 and radially rotatably connected to the driving shaft 3, and a second adjustment component arranged on the outer side of the inner shell 1 and in contact with the first adjustment member and capable of driving the first adjustment component to be lifted and lowered. When the utility model is used, the first adjustment component can be driven to be lifted and lowered by the second adjustment component, thereby driving the first adjustment component to be lifted and lowered. Since the first adjustment component is radially rotatably connected to the driving shaft 3, the driving shaft 3 drives the grinding head 301 to be lifted and lowered, thereby controlling the size of the grinding gap 5 between the grinding head 301 and the grinding chassis 4.

[0040] Further, the first adjusting component includes a rotating connecting piece 201.1 which is radially rotatably connected to the driving shaft 3, and a linkage piece is arranged on the outer side wall of the rotating connecting piece 201.1, and the linkage piece contacts the second adjusting component, and the second adjusting component includes a rotating ring 202.1 and a limit assembly for limiting the up and down displacement of the rotating ring 202.1, and an internal thread 202.11 is arranged on the inner side wall of the rotating ring 202.1. In the present embodiment, the rotating connecting piece 201.1 includes a bearing seat and a bearing mounted on the bearing seat, and the linkage piece includes an assembly ring 201.21, and a thread tooth 201.22 is arranged on the outer side wall of the assembly ring 201.21. Further, the outer shell 9 is sleeved on the outer side of the inner shell 1, and the outer shell 9 is connected to the inner shell 1 through a supporting connecting plate 6. A connecting groove 102 is opened on the outer side wall of the inner shell 1, and the thread tooth 201.22 passes through the connecting groove 102 and is threadably matched with the internal thread 202.11. When in use When using the utility model, it is only necessary to rotate the rotating ring 202.1 to the left or to rotate the rotating ring 202.1 to the right to adjust the height of the first adjusting component. In this embodiment, when the rotating ring 202.1 is rotated to the left, the internal thread 202.11 is threadedly matched with the thread teeth 201.22. Since the top and bottom of the rotating ring 202.1 are limited, the thread teeth 201.22 will gradually move downward along the internal thread 202.11 in the connecting groove 102, thereby lowering the height of the first adjusting component to achieve the purpose of driving the grinding head 301 to descend and reduce the grinding gap 5. When the rotating ring 202.1 is rotated to the right, the thread teeth 201.22 will gradually move upward along the internal thread 202.11 in the connecting groove 102, thereby raising the height of the first adjusting component to achieve the purpose of driving the grinding head 301 to rise and increase the grinding gap 5. By increasing or reducing the grinding gap 5, the purpose of adjusting the grinding coarseness of the target product can be achieved. Optionally, the drive shaft 3 is connected to the driving end of the motor, and the drive shaft is driven to rotate by the motor.

[0041] See also Figure 1 , Figure 4 and Figure 6The rotating ring 202.1 includes an upper ring portion 202.12 and a lower ring portion 202.13. The inner diameter and outer diameter of the upper ring portion 202.12 are larger than the inner diameter and outer diameter of the lower ring portion 202.13. The inner thread 202.11 is arranged on the inner side wall of the lower ring portion 202.13. The lower ring portion 202.13 is arranged above the supporting connecting plate 6. The bottom of the upper ring portion 202.12 contacts the top of the outer shell 9. In this embodiment, a top cover 7 is arranged on the top of the inner shell 1. A card slot 103 is arranged on the inner side wall of the inner shell 1. The top cover 7 is extended downwardly to provide an assembly extension plate 701. A buckle head 702 matched with the slot 103 is provided on one side of the assembly extension plate 701 close to the inner shell 1, a step-shaped limiting groove 202.14 is provided on the top of the upper ring portion 202.12, and a limiting protrusion 703 is provided on one side of the top cover 7 close to the upper ring portion 202.12. The limiting protrusion 703 is located in the step-shaped limiting groove 202.14 to limit the rotating ring 202.1 upward, so as to achieve the purpose of limiting the rotating ring 202.1 up and down. Therefore, the limiting components in the utility model are the top of the outer shell 9, the step-shaped limiting groove 202.14 and the limiting protrusion 703.

[0042] In this embodiment, a base 8 is included, the top of the base 8 is detachably connected to the bottom of the inner shell 1, and the bottom of the outer shell 9 is in contact with the top of the base 8. Optionally, a mounting through hole 801 is provided at the top of the base 8, and a threaded hole matching the mounting through hole 801 is provided at the bottom of the outer shell 9. The outer shell 9 is connected to the base 8 by inserting a screw into the mounting through hole 801 and then threading it into the threaded hole.

[0043] In this embodiment, the grinding chassis 4 includes a grinding processing groove 401, and the inner side wall of the grinding processing groove 401 is provided with an upper guide surface 401.1 and a lower grinding surface 401.2. The upper guide surface 401.1 can guide the target product to slide onto the grinding head 301, and the lower grinding surface 401.2 can cooperate with the grinding head 301 to grind the target product. In this embodiment, the grinding head 301 is in a truncated cone shape. Since the outer diameter of the grinding head 301 gradually increases from top to bottom, when the height of the grinding head 301 is increased, the gap between the grinding head 301 and the lower grinding surface 401.2 gradually decreases, so that the grinding degree of the target product is finer. When the height of the grinding head 301 is lowered, the gap between the grinding head 301 and the lower grinding surface 401.2 gradually increases, so that the grinding degree of the target product is coarser.

[0044] In this embodiment, the outer wall of the grinding chassis 4 is concavely provided with a limiting groove 402, and the limiting groove 402 is arc-shaped. The inner wall of the inner shell 1 is provided with a limiting block 104 adapted to the limiting groove 402. The top of the grinding chassis 4 is convexly provided with an assembly eave 403, and the assembly eave 403 is in contact with the top of the base 8. The inner wall of the inner shell 1 is provided with a tightening block that cooperates with the base 8 to press against the assembly eave 403.

[0045] In this embodiment, a friction protrusion 202.15 is arranged on the inner side wall of the upper ring portion 202.12, and an elastic friction protrusion is arranged on the side of the assembly extension plate 701 close to the friction protrusion 202.15, and the elastic friction protrusion can cooperate with the protrusion to increase the resistance of the upper ring portion 202.12 during rotation, and the elastic friction protrusion includes a mounting hole 704.1 arranged on the side of the assembly extension plate 701 close to the friction protrusion 202.15, and a spring 704.2 is arranged in the mounting hole 704.1, and one end of the spring 704.2 acts on the mounting hole The bottom of the hole 704.1, the other end of the spring 704.2 is connected to a friction column 704.3, first limit stops 705 are arranged on both sides of the friction protrusion 202.15, and a second limit stop 706 cooperating with the first limit stop 705 to limit the rotation of the rotating ring 202.1 is arranged on one side of the assembly extension plate 701 close to the friction protrusion 202.15, and the end of the friction column 704.3 close to the friction protrusion 202.15 is hemispherical. Optionally, the friction protrusion 202.15 is composed of multiple columns arranged in this way, and its outer surface is wavy.

[0046] Optionally, the outer wall of the upper ring portion 202.12 is marked with scale lines and direction markings for adjusting the coarseness of the target grinding product.

[0047] Optionally, a positioning piece 302 is provided on the driving shaft 3, and the positioning piece 302 is provided between the rotating connecting piece 201.1 and the grinding head 301, and the grinding head 301 is axially slidingly provided on the driving shaft 3, and a return spring 704.2 is provided between the positioning piece 302 and the grinding head 301, and the return spring 704.2 acts on the positioning piece 302 on the grinding head 301, and the driving shaft 3 can slide axially with the rotating connecting piece 201.1, and a clamping block 303 is provided on the driving shaft 3, and the clamping block 303 can act on the top of the rotating connecting piece 201.1 to limit the sliding of the driving shaft 3. When it is necessary to adjust the grinding coarseness of the target product, it is only necessary to push the grinding head 301 upwards so that the driving shaft 3 of the grinding head 301 slides axially upwards. At this time, when the rotating ring 202.1 is turned left, the internal thread 202.11 and the thread tooth 201 .22 thread matching, since the top and bottom of the rotating ring 202.1 are limited, the thread teeth 201.22 will gradually move downward along the internal thread 202.11 in the connecting groove 102, thereby reducing the height of the assembly ring 201.21. When the rotating ring 202.1 is turned right, the thread teeth 201.22 will gradually move upward along the internal thread 202.11 in the connecting groove 102, thereby raising the height of the assembly ring 201.21. When the grinding head 301 is not pushed upward, under the action of the return spring 704.2, the drive shaft 3 and the grinding head 301 move downward. At this time, the block 303 acts on the top of the rotating connector 201.1 to limit the displacement of the drive shaft 3. The height of the drive shaft 3 and the grinding head 301 is adjusted by adjusting the height of the assembly ring 201.21 to increase or decrease the grinding gap 5 to achieve the purpose of adjusting the grinding coarseness of the target product.

[0048] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the claims attached to the utility model.

Claims

1. A coffee bean grinder with adjustable coarse and fine grinding degree, characterized in that: include: An inner shell (1), the inner shell (1) is connected from top to bottom, a driving shaft (3) is rotatably arranged inside the inner shell (1), a grinding head (301) is arranged at one end of the driving shaft (3), a grinding base (4) is arranged at the bottom of the inner shell (1), and a grinding gap (5) is reserved between the grinding head (301) and the grinding base (4); A grinding head adjustment device, the grinding head adjustment device comprising a first adjustment component arranged on the inner side of the inner shell (1) and connected to the drive shaft (3) for radial rotation, and a second adjustment component arranged on the outer side of the inner shell (1) and in contact with the first adjustment component and capable of driving the first adjustment component to move up and down.

2. The grinder with adjustable coarse and fine grinding degree according to claim 1, characterized in that: The first adjustment component comprises a rotating connection member (201.1) connected to the drive shaft (3) in radial rotation, and a linkage member is provided on the outer side wall of the rotating connection member (201.1), and the linkage member is in contact with the second adjustment component.

3. The grinder with adjustable coarse and fine grinding degree according to claim 2, characterized in that: The second adjustment component comprises a rotating ring (202.1) and a limit component for limiting the upward and downward displacement of the rotating ring (202.1); an internal thread (202.11) is provided on the inner side wall of the rotating ring (202.1).

4. The grinder with adjustable coarse and fine grinding degree according to claim 3, characterized in that: The outer wall of the inner shell (1) is provided with a connecting groove (102), and the linkage member comprises an assembly ring (201.21). The outer wall of the assembly ring (201.21) is provided with thread teeth (201.22), and the thread teeth (201.22) pass into the connecting groove (102) and are threadably matched with the internal thread (202.11).

5. The grinder with adjustable coarse and fine grinding degree according to claim 4, characterized in that: An outer shell (9) is sleeved on the outer side of the inner shell (1), and the outer shell (9) is connected to the inner shell (1) via a supporting connecting plate (6). The rotating ring (202.1) comprises an upper ring portion (202.12) and a lower ring portion (202.13). The inner diameter and outer diameter of the upper ring portion (202.12) are larger than the inner diameter and outer diameter of the lower ring portion (202.13). The internal thread (202.11) is arranged on the inner side wall of the lower ring portion (202.13). The lower ring portion (202.13) is arranged above the supporting connecting plate (6), and the bottom of the upper ring portion (202.12) is in contact with the top of the outer shell (9).

6. The grinder with adjustable coarse and fine grinding degree according to claim 5, characterized in that: It comprises a base (8), the top of the base (8) is detachably connected to the bottom of the inner shell (1), and the bottom of the outer shell (9) is in contact with the top of the base (8).

7. The grinder with adjustable coarse and fine grinding degree according to claim 1, characterized in that: The grinding chassis (4) comprises a grinding processing groove (401), and the inner side wall of the grinding processing groove (401) is provided with an upper guide surface (401.1) and a lower grinding surface (401.2), the upper guide surface (401.1) can guide the target product to slide onto the grinding head (301), and the lower grinding surface (401.2) can cooperate with the grinding head (301) to grind the target product.

8. The grinder with adjustable coarse and fine grinding degree according to claim 6, characterized in that: The outer side wall of the grinding chassis (4) is concavely provided with a limiting groove (402), the inner side wall of the inner shell (1) is provided with a limiting block (104) adapted to the limiting groove (402), the top of the grinding chassis (4) is convexly provided with an assembly flange (403), the assembly flange (403) is in contact with the top of the base (8), and the inner side wall of the inner shell (1) is provided with a pressing block that cooperates with the base (8) and presses against the assembly flange (403).

9. The grinder with adjustable coarse and fine grinding degree according to claim 5, characterized in that: A top cover (7) is arranged on the top of the inner shell (1), a slot (103) is arranged on the inner side wall of the inner shell (1), an assembly extension plate (701) is extended downwardly from the top cover (7), a buckle head (702) matched with the slot (103) is arranged on the side of the assembly extension plate (701) close to the inner shell (1), a step-shaped limiting groove (202.14) is arranged on the top of the upper ring part (202.12), a limiting convex part (703) is arranged on the side of the top cover (7) close to the upper ring part (202.12), and the limiting convex part (703) is located in the step-shaped limiting groove (202.14) to limit the rotating ring (202.1) upwards.

10. The grinder with adjustable coarse and fine grinding degree according to claim 9, characterized in that: A friction convex portion (202.15) is arranged on the inner side wall of the upper ring portion (202.12); an elastic friction convex part is arranged on the side of the assembly extension plate (701) close to the friction convex portion (202.15); the elastic friction convex part can cooperate with the convex portion to increase the resistance of the upper ring portion (202.12) during rotation; first limit stoppers (705) are arranged on both sides of the friction convex portion (202.15); a second limit stopper (706) is arranged on the side of the assembly extension plate (701) close to the friction convex portion (202.15) and cooperates with the first limit stopper (705) to limit the rotation of the rotating ring (202.1).

Images