Bean grinder convenient for adjusting particle size

Abstract

The utility model relates to the technical field of coffee bean grinding equipment, in particular to a bean grinder convenient for adjusting particle size. The bean grinder comprises a base and a grinding device obliquely arranged at the top of the base. The grinding device comprises a powder mixing bin, a powder grinding bin and a machine body which are sequentially connected from top to bottom. The lower end of the powder mixing bin is in threaded connection with the powder grinding bin and is communicated with the powder grinding bin; an outer cutter head and an inner cutter head which are adjustable in distance are arranged in an inner cavity of the grinding bin; the outer cutter head is inserted into an inner cavity at the upper end of the grinding bin through the annular cutter rest; the annular knife rest is arranged below the powder mixing bin, and a bearing is arranged between the annular knife rest and the powder mixing bin; a reset spring is arranged between the annular knife rest and the grinding bin; a powder scraper is coaxially arranged below the inner cutter head; a motor is arranged in the machine body, and the inner cutter head and the powder scraper are in transmission connection with the motor through a main shaft. The bean grinder is simple in structure, coffee powder is not easy to remain on the cutterhead, and due to the arrangement of the bearing, the situation of blocking cannot occur when a user adjusts the thickness degree of ground powder.

Description

TECHNICAL FIELD

[0001] The utility model relates to coffee bean grinding equipment technical field especially, it relates to a kind of bean grinder of particle size is adjusted conveniently. BACKGROUND

[0002] Coffee grinder (i.e. bean grinder) is a kind of equipment to be used to grind coffee beans into powder, and the design principle of coffee grinder is to grind coffee beans into powder using mechanical force. Grinding of coffee beans is a relatively important step in coffee processing, and different grinding levels can change the flavor of the same coffee.

[0003] The bean grinder can generally adjust the fineness of the ground powder according to the needs to meet the coffee needs of different tastes. The existing bean grinder has a complex structure, and a large amount of coffee powder is easily left in the bean grinder, which is troublesome to clean and maintain later. Because the bean grinder has a complex structure, when the user adjusts the fineness of the ground powder of the bean grinder, the adjusting mechanism of the bean grinder is likely to jam, which is inconvenient for the user.

[0004] In addition, because the existing bean grinder will leave a large amount of coffee powder on the grinding device. Therefore, after grinding is completed, the user needs to take a small brush to clean the residual powder, which is troublesome to operate. SUMMARY

[0005] The utility model aims at providing a kind of bean grinder of particle size is adjusted conveniently, with the characteristics that the structure of bean grinder is simple, and the user will not appear the characteristics of jam when adjusting the fineness of the ground powder.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A kind of bean grinder of particle size is adjusted conveniently, for grinding coffee beans into coffee powder, the bean grinder includes base and the grinding device obliquely arranged at the top of the base, the grinding device includes powder adjusting bin, grinding bin and machine body main body connected in sequence from top to bottom;

[0008] The two ends of the powder adjusting bin are open, and the lower end is threadedly connected with the grinding bin and is in communication with the grinding bin;The discharge port of the grinding bin is obliquely arranged downward;The inner cavity of the grinding bin is provided with outer cutter disc and inner cutter disc with adjustable spacing;

[0009] The outer cutter disc is inserted into the inner cavity of the upper end of the grinding bin through the annular cutter holder;The annular cutter holder is arranged below the powder adjusting bin, and a bearing is arranged between the annular cutter holder and the powder adjusting bin;A return spring is arranged between the annular cutter holder and the grinding bin, and the return spring is adapted to apply an elastic force to the upper end of the annular cutter holder to force it to abut against the bearing;

[0010] The inner cutter disc is located inside the outer cutter disc, a powder scraper is coaxially arranged below the inner cutter disc; a motor is arranged in the main body, and the inner cutter disc and the powder scraper are in transmission connection with the motor through a main shaft. The bean grinder has simple structure, and coffee powder is not easy to remain on the cutter disc; the bearing is arranged to prevent the user from experiencing a jam when adjusting the fineness of the ground powder.

[0011] Further, the lower end of the annular cutter holder is in sliding connection with the inner cavity of the powder grinding bin; the inner wall of the annular cutter holder is provided with a limiting protrusion for limiting the outer cutter disc, and the outer cutter disc is arranged below the limiting protrusion; and the outer cutter disc is in positioning connection with the annular cutter holder through a positioning pin. The above scheme is adopted to effectively mount the outer cutter disc on the annular cutter holder.

[0012] Further, the lower end of the inner cutter disc is in positioning connection with the powder scraper through a positioning pin. The above scheme is adopted to ensure that the inner cutter disc and the powder scraper rotate synchronously.

[0013] Further, the inner edge surface of the powder adjusting bin is conical at the bottom. The above scheme is adopted to ensure that the coffee beans in the powder adjusting bin smoothly enter the powder grinding bin.

[0014] Further, the outer circular surface of the powder adjusting bin is provided with a scale. The above scheme is adopted to allow the user to adjust the grinding fineness of the grinding device according to the scale on the powder adjusting bin.

[0015] Further, the upper end of the powder adjusting bin is detachably provided with a top cover. The above scheme is adopted to prevent dust from falling into the powder adjusting bin.

[0016] Further, the inner cavity of the powder adjusting bin is provided with a protective cover shielding above the coffee bean outlet of the powder adjusting bin, and an outlet channel is formed between the protective cover and the powder adjusting bin. The above scheme is adopted to prevent the user from accidentally touching the outer cutter disc and the inner cutter disc in the powder grinding bin.

[0017] Further, a counterweight is arranged on the main body or the base. The above scheme is adopted to lower the gravity center of the bean grinder.

[0018] Further, the bean grinder further comprises a powder receiving cup with an opening at the top; the powder receiving cup is arranged in space with the grinding device, and is detachably arranged on the top of the base; and the opening of the powder receiving cup is adapted to receive the coffee powder falling from the discharge port. The above scheme is adopted to receive the coffee powder falling from the discharge port.

[0019] Further, a first magnet is embedded in the bottom of the powder receiving cup, and a second magnet is correspondingly embedded on the base and is attracted to the first magnet. The above scheme is adopted to fix and position the powder receiving cup by the base.

[0020] The technical scheme provided by the coffee bean grinder has the following beneficial effects:

[0021] The coffee bean grinder has simple structure, and the grinding device is arranged obliquely to prevent coffee powder from remaining on the cutter head;

[0022] The bearing arranged between the annular cutter holder and the powder adjusting bin prevents the user from experiencing a jamming condition when adjusting the fineness of the ground powder;

[0023] The additional protective cover prevents the user from accidentally touching the outer cutter head and the inner cutter head in the powder adjusting bin, and improves the safety performance;

[0024] The additional counterweight is used to lower the center of gravity of the coffee bean grinder, so that the coffee bean grinder can be placed stably. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structural schematic view of the coffee bean grinder in the utility model;

[0026] Figure 2 is a partial sectional structural schematic view of the coffee bean grinder in the utility model;

[0027] Figure 3 is Figure 2 is an enlarged schematic view of position A in the utility model;

[0028] Figure 4 is a structural schematic view of the powder adjusting bin and the protective cover in the utility model;

[0029] Figure 5 is a structural schematic view of the top cover in the utility model;

[0030] Figure 6 is a schematic view of the powder adjusting bin, the annular cutter holder and the return spring in the utility model;

[0031] Figure 7 is a partial schematic view of the internal structure of the coffee bean grinder in the utility model;

[0032] Figure 8 is a partial sectional structural schematic view of the annular cutter holder and the outer cutter head in the utility model;

[0033] Figure 9 is a partial sectional structural schematic view of the powder scraper and the outer cutter head in the utility model.

[0034] The reference signs in the drawings are as follows:

[0035] 1, base; 2, powder adjusting bin; 201, limiting hole; 3, powder grinding bin; 301, discharge port; 302, positioning groove; 4, main body of machine; 401, wire passing hole; 5, powder receiving cup; 6, outer cutter disc; 7, inner cutter disc; 8, annular cutter holder; 801, limiting protrusion; 802, positioning protrusion; 9, bearing; 10, return spring; 11, powder scraper; 12, motor; 13, main shaft; 14, top cover; 1401, limiting block; 15, protective cover; 16, mounting bracket; 17, switch button. DETAILED DESCRIPTION

[0036] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are used only for explaining the present application, and cannot be understood as a limitation of the present application.

[0037] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the features limited as "first" and "second" can explicitly or implicitly include one or more of the features, which are used to distinguish the described features, and have no order or priority.

[0038] In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0039] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] The present application provides a coffee grinder for grinding coffee beans into coffee powder.

[0041] Please refer to Figure 1As shown, the bean grinder for adjusting particle size includes a base 1 and a grinding device tiltedly arranged on the top of the base 1. The grinding device includes a powder mixing bin 2, a powder grinding bin 3 and a body 4 connected in sequence from top to bottom.

[0042] See also Figure 2 As shown, both ends of the powder adjusting bin 2 are open. The lower end of the powder adjusting bin 2 is threadedly connected to the upper end of the powder grinding bin 3. The upper end of the powder grinding bin 3 is open. The powder adjusting bin 2 is connected to the upper end of the powder grinding bin 3. The upper end of the powder grinding bin 3 is connected to the upper end of the fuselage main body 4. The lower end of the fuselage main body 4 is arranged on the top of the base 1. The discharge port 301 of the powder grinding bin 3 is arranged to be tilted downward. The inner cavity of the powder grinding bin 3 is provided with an outer cutter disc 6 and an inner cutter disc 7 with adjustable spacing.

[0043] In this embodiment, the lower portion of the inner cavity of the powder mixing bin 2 is provided with a fine internal thread. The upper portion of the inner cavity of the powder grinding bin 3 is provided with a fine external thread that matches the fine internal thread. Preferably, the pitch of the fine internal thread is 0.75 mm, and the pitch of the fine external thread is 0.75 mm.

[0044] In this embodiment, the powder mixing bin 2, the grinding bin 3 and the main body 4 are coaxially arranged. The angle between the axis of the grinding device and the base 1 is 5° to 15°. The angle between the axis of the discharge port 301 and the axis of the grinding bin 3 (i.e., the axis of the grinding device) is 30° to 40°. Preferably, the angle between the axis of the grinding device and the base 1 is 10°, and the angle between the axis of the discharge port 301 and the axis of the grinding bin 3 is 34°, so as to ensure that the ground coffee powder in the grinding device is smoothly discharged from the discharge port 301 of the grinding bin 3.

[0045] The angle between the bottom of the inner cavity of the grinding bin 3 and the base 1 is 5° to 15°.

[0046] Furthermore, in order to ensure that the coffee beans in the powder mixing bin 2 can smoothly enter the powder grinding bin 3, the bottom of the inner edge surface of the powder mixing bin 2 is conical.

[0047] Furthermore, a top cover 14 is detachably provided on the upper end of the powder mixing bin 2 .

[0048] In this embodiment, in order to prevent the top cover 14 and the powder mixing bin 2 from rotating relative to each other, please refer to Figure 4 and Figure 5 As shown, a limiting hole 201 is provided on the top of the powder mixing bin 2 , and a limiting block 1401 is correspondingly provided on the top cover 14 .

[0049] Furthermore, in order to prevent the user from accidentally touching the outer blade disc 6 and the inner blade disc 7 in the grinding chamber 3, please refer to Figure 2 and Figure 5As shown, the inner cavity of the powder adjusting bin 2 is provided with a protective cover 15 which is arranged above the bean outlet of the powder adjusting bin 2 to improve the safety performance of the grinding device. The protective cover 15 and the powder adjusting bin 2 form a bean outlet channel. The coffee beans in the powder adjusting bin 2 pass through the bean outlet channel and the bean outlet in sequence and finally enter the inner cavity of the powder grinding bin 3.

[0050] In the embodiment, the protective cover 15 comprises a cover body and three connecting rods. The top surface of the cover body is arc-shaped and protrudes upward to prevent the coffee beans in the powder adjusting bin 2 from accumulating on the top surface of the cover body. The three connecting rods are arranged at the edges of the cover body and are detachably connected with the powder adjusting bin 2.

[0051] As shown in Figure 2 and Figure 3 As shown, the outer cutter disc 6 is inserted into the inner cavity of the upper end of the powder grinding bin 3 through the annular cutter holder 8. The annular cutter holder 8 is arranged below the powder adjusting bin 2. The annular cutter holder 8 and the powder adjusting bin 2 are provided with a bearing 9. The annular cutter holder 8 and the powder grinding bin 3 are provided with a reset spring 10 which is adapted to apply an elastic force to the annular cutter holder 8 to force the upper end of the annular cutter holder 8 to abut against the bearing 9.

[0052] As shown in Figures 6-8 As shown, the inner wall of the annular cutter holder 8 is provided with a limiting protrusion 801 for limiting the outer cutter disc 6. The outer cutter disc 6 is arranged below the limiting protrusion 801. The outer cutter disc 6 and the side wall of the annular cutter holder 8 are both provided with a pin hole for mounting a positioning pin. The outer cutter disc 6 is positioned and connected with the annular cutter holder 8 through the positioning pin. The upper end of the annular cutter holder 8 is provided with a positioning protrusion 802. The powder grinding bin 3 is correspondingly provided with a positioning groove 302 which is matched with the position of the positioning protrusion 802. The reset spring 10 is arranged in the positioning groove 302. The positioning protrusion 802 is arranged above the reset spring 10 and in the positioning groove 302.

[0053] In the embodiment, the limiting protrusion 801 is a protrusion with a size of 2mm×2mm which is used to control the distance between the outer cutter disc 6 and the inner cutter disc 7.

[0054] In the embodiment, the positioning protrusion 802 is three and the reset spring 10 is three. The length direction of the reset spring 10 is parallel to the axial direction of the powder grinding bin 3.

[0055] In the embodiment, the outer ring of the bearing 9 is mounted on the bottom of the powder adjusting bin 2 and the bearing 9 is coaxially arranged with the powder adjusting bin 2. The inner ring of the bearing 9 abuts against the upper end surface of the annular cutter holder 8.

[0056] Further, the inner ring of the bearing 9 is provided with a clamping block, and the upper end surface of the annular tool rest 8 is correspondingly provided with a clamping groove matched with the clamping block. When the rotating powder bin 2 is rotated, the inner and outer rings of the bearing 9 are relatively rotated, and the annular tool rest 8 is relatively static with the inner ring of the bearing 9. Compared with the direct contact between the powder bin 2 and the annular tool rest 8, the friction is larger, and the friction can be effectively reduced by adding the bearing 9, so that the powder bin 2 can be more smoothly rotated.

[0057] Please refer to Figure 2 and Figure 9 It is shown that the inner cutter disc 7 is located inside the outer cutter disc 6. The inner cutter disc 7 is coaxially arranged with the outer cutter disc 6, and the inner cutter disc 7 is located below the outer cutter disc 6. A powder scraper 11 is coaxially arranged below the inner cutter disc 7. A motor 12 is arranged in the main body 4 of the machine. The inner cutter disc 7 and the powder scraper 11 are both fixed on a main shaft 13. The inner cutter disc 7 and the powder scraper 11 are both drivingly connected with the motor 12 through the main shaft 13.

[0058] Among them, in order to ensure that the inner cutter disc 7 and the powder scraper 11 rotate synchronously, please refer to Figure 9 It is shown that the lower end of the inner cutter disc 7 is positioned and connected with the powder scraper 11 through a positioning pin.

[0059] In this embodiment, please refer to Figure 2 It is shown that the motor 12 is installed in the main body 4 of the machine through a mounting bracket 16. A wire hole 401 is formed on the main body 4 of the machine for the cable to pass through. Among them, the charging cable of the motor 12 extends to the outside of the main body 4 of the machine through the wire hole 401, so as to charge the motor 12. The mounting bracket 16 is fixed in the main body 4 of the machine and located below the powder bin 3. The mounting bracket 16 is positioned and connected with the powder bin 3 through a positioning pin.

[0060] Further, please refer to Figure 2 It is shown that the grinding device further comprises a switch button 17 for controlling the start or stop of the motor 12.

[0061] In this embodiment, the switch button 17 is embedded in the powder bin 3. The switch button 17 is located above the discharge port 301 of the powder bin 3.

[0062] Further, please refer to Figure 2 It is shown that the coffee grinder further comprises a powder receiving cup 5 having an opening at the top. The powder receiving cup 5 is spaced apart from the grinding device. The powder receiving cup 5 is detachably arranged on the top of the base 1. The opening of the powder receiving cup 5 is adapted to receive the coffee powder falling from the discharge port 301.

[0063] Further, a first magnet is embedded in the bottom of the powder receiving cup 5. A second magnet is correspondingly embedded on the base 1 and is attracted to the first magnet.

[0064] In the embodiment, the powder receiving cup 5 is vertically arranged. The first magnet is arranged at the center of the bottom of the powder receiving cup 5. The base 1 is fixed and positioned to the powder receiving cup 5 through the attraction between the first magnet and the second magnet, thereby ensuring that the powder receiving cup 5 can effectively receive the coffee powder dropped from the discharge port 301 and effectively avoid the accidental overturning of the powder receiving cup 5.

[0065] In the embodiment, the working principle of the coffee grinder is as follows:

[0066] The powder adjusting bin 2 is threadedly connected to the powder grinding bin 3. By rotating the powder adjusting bin 2, when the powder adjusting bin 2 is rotated clockwise, the powder adjusting bin 2 moves downward along the axial direction of the grinding device. In this case, the powder adjusting bin 2 moves downward by 0.75 mm for each rotation, thereby achieving very fine adjustment.

[0067] When the powder adjusting bin 2 moves downward along the axial direction of the grinding device, the powder adjusting bin 2 indirectly drives the annular cutter holder 8 to move downward along the axial direction of the grinding device through the bearing 9, and the annular cutter holder 8 drives the outer cutter disc 6 to move downward along the axial direction of the grinding device through the limiting protrusion 801, thereby reducing the distance between the outer cutter disc 6 and the inner cutter disc 7 to make the coffee grinder grind finer coffee powder. In this case, the bearing 9 is mainly used to transmit a downward pressure. When the powder adjusting bin 2 drives the bearing 9 to rotate downward, the bearing 9 transmits a downward pressure to the annular cutter holder 8. If the powder adjusting bin 2 directly contacts the annular cutter holder 8, the friction between them is large, thereby causing the user to easily experience a jam when rotating the powder adjusting bin 2. Compared with the direct contact between the powder adjusting bin 2 and the annular cutter holder 8, the indirect contact between the powder adjusting bin 2 and the annular cutter holder 8 through the bearing 9 can make the user rotate the powder adjusting bin 2 smoothly without experiencing a jam.

[0068] Conversely, when the powder adjusting bin 2 is rotated counterclockwise, the powder adjusting bin 2 moves upward along the axial direction of the grinding device. In this case, the powder adjusting bin 2 moves downward by 0.75 mm for each rotation, thereby achieving very fine adjustment. When the powder adjusting bin 2 moves downward along the axial direction of the grinding device, the return spring 10 rebounds. During this period, the return spring 10 applies an elastic force to the annular cutter holder 8 to force the upper end of the annular cutter holder 8 to abut against the bearing 9, so that the annular cutter holder 8 drives the outer cutter disc 6 to move upward along the axial direction of the grinding device, thereby increasing the distance between the outer cutter disc 6 and the inner cutter disc 7 to make the coffee grinder grind coarser coffee powder.

[0069] Further, the outer circumferential surface of the powder adjusting bin 2 is provided with a scale (not shown in the figure) to allow the user to adjust the grinding fineness of the grinding device according to the scale on the powder adjusting bin 2.

[0070] Further, in order to reduce the gravity center of the bean grinder, the counterweight is arranged on the main body 4 or the base 1 to ensure the stable placement of the bean grinder.

[0071] The bean grinder convenient to adjust particle size has simple structure, the grinding device is arranged obliquely to make coffee powder not easily remaining on the cutter head, the bearing is arranged between the annular cutter holder and the powder adjusting bin to prevent the jamming when the user adjusts the fineness of the ground powder, the protective cover is additionally arranged to prevent the user from accidentally touching the outer cutter and the inner cutter in the powder adjusting bin and improve the safety performance, and the counterweight is additionally arranged to reduce the gravity center of the bean grinder to enable the bean grinder to be placed stably.

[0072] In the description of the present specification, the description referring to the terms "embodiment", "example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0073] Although the embodiments of the present application have been shown and described, it should be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A coffee bean grinder with adjustable particle size for grinding coffee beans into coffee powder, characterized in that: The coffee bean grinder includes a base and a grinding device obliquely arranged on the top of the base, wherein the grinding device includes a powder mixing bin, a powder grinding bin and a main body connected in sequence from top to bottom; The powder mixing bin is open at both ends, and its lower end is threadedly connected to the powder grinding bin and communicates with the powder grinding bin; the discharge port of the powder grinding bin is tilted downward; the inner cavity of the powder grinding bin is provided with an outer cutter disc and an inner cutter disc with adjustable spacing; The outer blade disc is inserted into the inner cavity at the upper end of the grinding bin via an annular blade holder; the annular blade holder is placed below the powder mixing bin, and a bearing is provided between the annular blade holder and the powder mixing bin; a return spring is provided between the annular blade holder and the grinding bin, and the return spring is adapted to apply an elastic force to the annular blade holder, forcing its upper end to contact the bearing; The inner cutter disc is located inside the outer cutter disc, and a scraper is coaxially arranged below the inner cutter disc; a motor is arranged in the fuselage body, and the inner cutter disc and the scraper are both transmission-connected to the motor through a main shaft.

2. The coffee bean grinder according to claim 1, characterized in that: The lower end of the annular tool holder is slidably connected to the inner cavity of the grinding bin; the inner wall of the annular tool holder is provided with a limiting protrusion for limiting the outer tool disc, and the outer tool disc is placed below the limiting protrusion; the outer tool disc is positioned and connected to the annular tool holder through a positioning pin.

3. The coffee bean grinder according to claim 1, characterized in that: The lower end of the inner cutter disc is positioned and connected to the powder scraper via a positioning pin.

4. The coffee bean grinder according to claim 1, wherein: The bottom of the inner edge surface of the powder mixing bin is conical.

5. The coffee bean grinder according to claim 1, characterized in that: The outer circumferential surface of the powder mixing bin is provided with a scale.

6. The coffee bean grinder according to claim 1, characterized in that: The upper end of the powder mixing bin is detachably provided with a top cover.

7. The coffee bean grinder according to claim 1, characterized in that: The inner cavity of the powder mixing bin is provided with a protective cover covering the bean outlet of the powder mixing bin, and a bean outlet channel is formed between the protective cover and the powder mixing bin.

8. The coffee bean grinder according to claim 1, wherein: A counterweight is provided on the fuselage body or the base.

9. The coffee bean grinder according to claim 1, characterized in that: It also includes a powder collecting cup with an opening on the top; the powder collecting cup is spaced apart from the grinding device, and the powder collecting cup is detachably arranged on the top of the base, and the opening of the powder collecting cup is suitable for receiving coffee powder dropped from the discharge port.

10. The coffee bean grinder according to claim 9, characterized in that: A first magnet is embedded in the bottom of the powder receiving cup, and a second magnet attracted to the first magnet is correspondingly embedded on the base.

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