Bean grinder

Abstract

The utility model relates to the technical field of bean grinding machines, and discloses a bean grinding machine which is characterized in that a bean grinding cavity is formed in a bean grinding cylinder, an adjusting ring is rotatably arranged on the bean grinding cylinder, and a material passing opening communicated with the bean grinding cavity is formed in the adjusting ring; the grinding assembly comprises an inner grinding wheel and an outer grinding wheel which are matched for grinding beans, the outer grinding wheel is arranged at the discharging end of the bean grinding cylinder, a grinding gap is formed between the inner grinding wheel and the outer grinding wheel, and the adjusting ring is used for adjusting the grinding gap; the transmission assembly comprises a transmission part and a rotating shaft, one end of the rotating shaft is connected with the inner grinding wheel, the other end of the rotating shaft is inserted into the transmission part and slidably connected with the driving assembly, the driving assembly is detachably arranged on the bean grinding barrel and can move in the axis direction of the rotating shaft, the driving assembly can drive the rotating shaft to rotate on the transmission part, and the adjusting ring is connected with the transmission part. The transmission part can be driven to move along the axis direction of the rotating shaft; the grinding machine has the advantages that the driving assembly is convenient to assemble and disassemble, the requirements of different users can be met, and the grinding gap is convenient to adjust.

Description

Technical Field

[0001] The utility model relates to the technical field of coffee bean grinders, in particular to a coffee bean grinder. Background Art

[0002] With the development of society, people's living standards are getting higher and higher, coffee is becoming more and more popular among consumers, and drinking coffee has even become a habit of life. However, the drive component of the current coffee bean grinder is usually fixedly connected to the grinder, making the drive component non-detachable and unable to be replaced according to usage requirements, such as replacing a manual drive component with an electric drive component. The drive form is single and the user experience is poor. In addition, when the drive component is damaged, the entire machine needs to be discarded, which is very wasteful. Utility Model Content

[0003] The utility model aims to provide a coffee bean grinder with a driving assembly that is convenient to assemble and disassemble, can adapt to the needs of different users, and has a convenient grinding gap adjustment.

[0004] In order to achieve the above-mentioned object, the utility model provides a bean grinder, which comprises a bean grinding cylinder, an adjustment ring, a grinding assembly, a transmission assembly and a drive assembly; a bean grinding chamber is provided in the bean grinding cylinder, the adjustment ring is rotatably arranged on the bean grinding cylinder, and a material transfer port communicating with the bean grinding chamber is provided on the adjustment ring;

[0005] The grinding assembly comprises an inner grinding wheel and an outer grinding wheel for grinding beans, the outer grinding wheel is arranged at the discharge end of the bean grinding cylinder, a grinding gap is arranged between the inner grinding wheel and the outer grinding wheel, and the adjusting ring is used to adjust the grinding gap;

[0006] The transmission assembly includes a transmission member and a rotating shaft, one end of the rotating shaft is connected to the inner grinding wheel, the other end of the rotating shaft is inserted into the transmission member and is slidably connected to the driving assembly, the driving assembly is detachably arranged on the bean grinding cylinder and can move along the axial direction of the rotating shaft, the driving assembly can drive the rotating shaft to rotate on the transmission member, the adjusting ring is connected to the transmission member, and can drive the transmission member to move along the axial direction of the rotating shaft.

[0007] As a preferred solution of the present utility model, a guide structure is provided between the transmission member and the rotating shaft.

[0008] As a preferred solution of the utility model, it also includes a connecting piece, one end of which is connected to the driving assembly, and the other end of which is connected to the adjusting ring, and the connecting piece is provided with a limiting hole that matches the shape of the rotating shaft.

[0009] As a preferred solution of the utility model, the adjustment ring is arranged at the feeding end of the bean grinding cylinder, and the adjustment ring is provided with a plug-in hole plugged into the connecting piece, the diameter of the plug-in hole close to the rotating shaft is smaller than the diameter of the end away from the rotating shaft, and the plug-in hole matches the shape of the connecting piece.

[0010] As a preferred solution of the utility model, the driving assembly includes a handle, one end of the connecting member is connected to the handle, and the limiting hole is arranged at the other end of the connecting member.

[0011] As a preferred solution of the utility model, the drive assembly also includes a mounting structure connected to the handle, the mounting structure is rotatably arranged on the bean grinding cylinder, and one end of the connecting piece is provided with a mounting groove that is plugged into and matched with the drive shaft of the mounting structure.

[0012] As a preferred solution of the utility model, the mounting structure includes a mounting seat, a telescopic handle and a handle portion, the mounting seat is arranged on the bean grinding cylinder, one end of the telescopic handle is rotatably connected to the telescopic handle, the other end of the telescopic handle is connected to the handle portion, and when the telescopic handle is in close contact with the mounting seat, the handle portion is located below the telescopic handle.

[0013] As a preferred solution of the utility model, the driving assembly includes a driving motor and a mounting structure for mounting the driving motor on the bean grinding cylinder, one end of the connecting piece is provided with a mounting groove which is plugged into and cooperates with the driving shaft of the driving motor, and the limiting hole is arranged at the other end of the connecting piece.

[0014] As a preferred solution of the utility model, a locking assembly for locking the adjustment ring is provided on the bean grinding cylinder, and the locking assembly includes a locking column and a movable seat. A locking groove is provided on the bean grinding cylinder, and the movable seat is arranged in the locking groove and can move along the length direction of the bean grinding cylinder. One end of the locking column is connected to the movable seat, and a plurality of positioning grooves arranged at intervals are provided on the adjustment ring. The other end of the locking column is plugged into and matched with any one of the positioning grooves.

[0015] As a preferred solution of the utility model, an adjustment end plate is threadedly connected to one end of the rotating shaft connected to the outer grinding wheel, a dial is connected to the bottom of the outer grinding wheel, and the adjustment end plate presses the dial onto the outer grinding wheel, and the outer diameter of the bottom surface of the outer grinding wheel is not less than the inner diameter of the bottom surface of the inner grinding wheel.

[0016] Compared with the prior art, the coffee bean grinder of the utility model has the following beneficial effects:

[0017] In the embodiment of the utility model, the transmission member is provided so that the drive assembly can be detachably arranged on the bean grinding cylinder, so that the drive assembly can be conveniently disassembled for inspection or replacement to meet the needs of different users, and the loading and unloading is convenient; at the same time, the utility model drives the transmission member by rotating the adjustment ring to drive the rotating shaft to move up and down to adjust the grinding gap, and the drive assembly will not move when the rotating shaft moves. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the embodiment of the utility model, the drawings of the embodiment will be briefly introduced below.

[0019] Figure 1 is a structural schematic diagram of embodiment 1;

[0020] Figure 2 is a cross-sectional view of the first embodiment;

[0021] Figure 3 yes Figure 2 Schematic diagram of the structure of the middle A area;

[0022] Figure 4 yes Figure 2 Schematic diagram of the structure of the middle B area;

[0023] Figure 5 is a structural diagram of Embodiment 2;

[0024] Figure 6 is a cross-sectional view of the second embodiment;

[0025] In the figure, 1 is a bean grinding cylinder; 11 is a locking groove; 12 is a material receiving cylinder; 2 is an adjusting ring; 21 is a material passing port; 22 is an outer ring; 23 is an inner ring; 24 is a plug-in hole; 25 is a positioning groove; 3 is a grinding assembly; 31 is an inner grinding wheel; 32 is an outer grinding wheel; 33 is a grinding wheel sleeve; 331 is a shaft sleeve; 332 is a placement groove; 333 is a bearing; 334 is a connecting column; 335 is a bean passing hole; 4 is a transmission assembly; 41 is a transmission member; 411 is a guide groove; 42 is a rotating shaft; 421 is a guide column; 422 is an adjusting end plate; 5 is a driving assembly; 51 is a mounting seat; 52 is a telescopic handle; 53 is a handle; 6 is a connecting member; 61 is a limiting hole; 7 is a locking assembly; 71 is a locking column; 72 is a moving seat; 73 is a spring; 8 is a turntable; 81 is a groove; and 9 is a marble. DETAILED DESCRIPTION

[0026] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0027] In the description of the present utility model, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", etc. 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 the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. It should be understood that the terms "first", "second", etc. are used in the present utility model to describe various information, but such information should not be limited to these terms, which are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present utility model, the "first" information may also be referred to as the "second" information, and similarly, the "second" information may also be referred to as the "first" information.

[0028] like Figures 1 to 6 As shown, a bean grinder in a preferred embodiment of the utility model comprises a bean grinding cylinder, an adjusting ring, a grinding assembly, a transmission assembly and a driving assembly; a bean grinding chamber is provided in the bean grinding cylinder, the adjusting ring is rotatably arranged on the bean grinding cylinder, and a material transfer port communicating with the bean grinding chamber is provided on the adjusting ring;

[0029] The grinding assembly comprises an inner grinding wheel and an outer grinding wheel for grinding beans, the outer grinding wheel is arranged at the discharge end of the bean grinding cylinder, a grinding gap is arranged between the inner grinding wheel and the outer grinding wheel, and the adjusting ring is used to adjust the grinding gap;

[0030] The transmission assembly includes a transmission member and a rotating shaft, one end of the rotating shaft is connected to the inner grinding wheel, the other end of the rotating shaft is inserted into the transmission member and is slidably connected to the driving assembly, the driving assembly is detachably arranged on the bean grinding cylinder and can move along the axial direction of the rotating shaft, the driving assembly can drive the rotating shaft to rotate on the transmission member, the adjusting ring is connected to the transmission member, and can drive the transmission member to move along the axial direction of the rotating shaft, preferably a threaded connection.

[0031] Therefore, the embodiment of the utility model provides a transmission member so that the drive assembly can be detachably arranged on the bean grinding cylinder, which is convenient for removing the drive assembly for inspection or replacement to adapt to the needs of different users and is convenient for loading and unloading; at the same time, the utility model drives the transmission member by rotating the adjustment ring to drive the rotating shaft to move up and down to adjust the grinding gap, and the drive assembly will not move when the rotating shaft moves.

[0032] For example, Figure 3 As shown, a guide structure is provided between the transmission member and the rotating shaft; specifically, the guide structure includes a guide column arranged on the rotating shaft, and a guide groove cooperating with the guide column is provided on the transmission member.

[0033] For example, Figure 2 and 3 As shown, a bean grinder also includes a connecting piece, one end of which is connected to the driving assembly, and the other end of which is connected to the adjusting ring. The connecting piece is provided with a limiting hole that matches the shape of the rotating shaft, and the cross-section of the limiting hole is preferably a hexagon. In other embodiments, the cross-section of the limiting hole can be a polygon or other shapes, so that when the connecting piece rotates, the rotating shaft can be driven to rotate, and the rotating shaft can move up and down along the length direction of the device, and the connecting piece will not move. In addition, through such a design, the driving assembly can be quickly pulled out from the rotating shaft through the connecting piece, thereby realizing quick release of the driving assembly. When the driving assembly is set at the feed end of the grinding cylinder, the beans can be quickly and conveniently poured from the feed end into the grinding chamber.

[0034] Exemplarily, the adjusting ring is arranged at the feeding end of the bean grinding cylinder, the adjusting ring includes an outer ring and an inner ring connected to the outer ring, the feeding port is formed between the inner ring and the outer ring, the inner ring is provided with a plug-in hole plugged into the connecting piece, the diameter of the plug-in hole close to the end of the rotating shaft is smaller than the diameter away from the end of the rotating shaft, and the plug-in hole is matched with the shape of the connecting piece; through such a design, under the action of the connecting piece and the plug-in hole, when the rotating shaft moves downward, the driving assembly is still fixed to the adjusting ring through the connecting piece, and will not move downward under the action of gravity, while the rotating shaft will slide downward in the plug-in hole.

[0035] The structure of the driving assembly includes but is not limited to the following two implementations, and through the combination of the connector and the driving assembly, the user can install driving assemblies of different structures according to the use requirements, realize the switching of different driving modes, meet different needs, and facilitate loading and unloading:

[0036] Embodiment 1: Figures 1 to 4 As shown, the driving assembly includes a handle, one end of the connecting piece is connected to the handle, and the limiting hole is arranged at the other end of the connecting piece; thus, the user can replace the driving assembly with a handle according to actual needs, thereby realizing manual grinding, and can manually control the grinding speed. The ground powder is uniform and fine, and the user can experience the feeling of manual grinding.

[0037] In addition, the drive assembly also includes a mounting structure connected to the handle, the mounting structure is rotatably arranged on the bean grinding cylinder, one end of the connecting piece is provided with a mounting groove that is plugged into the driving shaft of the mounting structure, and the limiting hole is arranged at the other end of the connecting piece.

[0038] Specifically, the mounting structure includes a mounting seat, a telescopic handle and a handle portion, the mounting seat is arranged on the bean grinding cylinder, the connecting end of the handle portion is threadedly connected to the telescopic handle for easy disassembly, the free end of the handle portion is in an arc shape for easy grasping, one end of the telescopic handle is rotatably connected to the telescopic handle, the other end of the telescopic handle is connected to the handle portion, and when the telescopic handle is in close contact with the mounting seat, the handle portion is located below the telescopic handle. Specifically, the handle includes a rotating rod and a telescopic rod, one end of the rotating rod is rotatably connected to the mounting seat, a telescopic cavity is arranged in the rotating rod, the opening of the telescopic cavity faces the other end of the rotating rod, the telescopic rod is arranged in the telescopic cavity and can move along the length direction of the rotating rod, a limiter is arranged on one end of the telescopic rod arranged in the telescopic cavity, the limiter is preferably a rubber sleeve, and the limiter is not limited to the above materials and shapes. Through such a design, the handle is extended when in use, the torque is reduced, and manpower is saved, and the arm is shortened when idle, so that the handle can be designed to be telescopic.

[0039] Embodiment 2: Figure 5 and Figure 6 As shown, the driving assembly includes a driving motor and a mounting structure for mounting the driving motor on the bean grinding cylinder. Specifically, the mounting structure includes a mounting seat, a switch is provided on the mounting seat, one end of the connecting piece is provided with a mounting groove for plugging and matching with the driving shaft of the driving motor, and the limiting hole is provided at the other end of the connecting piece. Thus, the user can replace the driving assembly with a driving motor according to actual needs, thereby realizing automatic grinding of beans, saving time and effort, freeing hands, and the ground powder is uniform and fine.

[0040] Exemplarily, the bean grinding cylinder is provided with a locking assembly for locking the adjustment ring, the locking assembly includes a locking column and a movable seat, the bean grinding cylinder is provided with a locking groove, the movable seat is arranged in the locking groove and can move along the length direction of the bean grinding cylinder, one end of the locking column is connected to the movable seat, and the adjustment ring is provided with a plurality of positioning grooves arranged at intervals, and the other end of the locking column is plugged and matched with any one of the positioning grooves; specifically, a spring is provided between the movable seat and the locking groove, and the spring presses the movable seat between the locking grooves, and before rotating the adjustment ring, the movable seat is moved downward, the spring is compressed, and the locking column is separated from the locking groove, and then the adjustment ring is rotated. After adjustment, the movable seat is released, and the movable seat is reset under the elastic force of the spring, and the locking column is plugged into a locking groove, thereby locking the adjustment ring. It should also be noted that the number and spacing angle of the locking grooves correspond to the scale values ​​on the adjustment ring, so when the adjustment ring is rotated to a certain scale, the locking column can be plugged into one of the locking grooves.

[0041] Exemplarily, an adjusting end plate is threadedly connected to one end of the rotating shaft connected to the outer grinding wheel, a scale plate is connected to the bottom of the outer grinding wheel, and the scale lines on the scale plate are exposed on the adjusting end plate, and the adjusting end plate presses the scale plate onto the outer grinding wheel, and the outer diameter of the bottom surface of the outer grinding wheel is not less than the inner diameter of the bottom surface of the inner grinding wheel, thereby, the assembly is simple, and during assembly, the inner and outer grinding wheels can be manually and quickly assembled on the rotating shaft, and after use, the user can disassemble the inner grinding wheel, clean the grinding areas of the inner and outer grinding wheels to reduce residual powder, and then can put the inner grinding wheel back by himself, which is convenient to clean. In addition, the manufacturer can adjust the grinding gap by adjusting the end plate, and the grinding gap is zeroed when leaving the factory to ensure the consistency of the grinding gap when leaving the factory, and the user only needs to adjust the grinding gap by adjusting the ring, without turning the adjusting end plate, and will not dirty his hands, and it is convenient and quick to use.

[0042] Exemplarily, the outer grinding wheel sleeve is provided on the outer shell of the outer grinding wheel, the outer grinding wheel insert is injection molded on the grinding wheel sleeve, and the grinding wheel sleeve is plugged into the bean grinding cylinder to facilitate the loading and unloading of the outer grinding wheel.

[0043] Exemplarily, the grinding assembly also includes a sealing plate, which is detachably connected to the grinding wheel sleeve. Preferably, the sealing plate is connected to the grinding wheel sleeve by screws, and the grinding wheel sleeve is provided with a grinding wheel groove. The sealing plate presses the outer grinding wheel onto the grinding wheel groove, thereby enabling rapid assembly of the grinding assembly and the grinding wheel sleeve. During assembly, after the rotating shaft is assembled to the grinding wheel sleeve, the grinding assembly can be manually and quickly assembled on the grinding wheel sleeve, and then the grinding wheel sleeve can be assembled on the bean grinding cylinder according to appearance requirements, thereby making it convenient to plug the grinding wheel sleeve into any bean grinding cylinder by installing the core component of the grinder on the grinding wheel sleeve, and after use, the user can remove the inner grinding wheel, clean the bean grinding areas of the inner and outer grinding wheels to reduce residual powder, and then can reinstall the inner grinding wheel by himself, which is convenient for cleaning.

[0044] For example, Figure 2 and 3 As shown, the grinding wheel sleeve is connected to a sleeve and a placement groove for placing the transmission part of the adjusting ring, and the rotating shaft is inserted in the sleeve; specifically, a bearing is provided between the rotating shaft and the sleeve, and specifically, a plurality of bean holes are provided between the grinding wheel sleeve and the sleeve, and a connecting column is also provided between the rotating shaft and the sleeve, and two bearings are provided, which are respectively arranged at both ends of the connecting column, so that the rotating shaft is hidden in the sleeve, the rotating shaft will not contact with the beans, and the beans are prevented from being contaminated.

[0045] Exemplarily, the shaft sleeve and the grinding wheel sleeve are integrally formed, and the bearing insert is injection molded on the shaft sleeve; during processing, the bearing, connecting column and inner grinding wheel are placed in the mold for injection molding, thereby ensuring the coaxiality of each component without the need for subsequent adjustment processes, thereby reducing the processing steps and ensuring assembly accuracy.

[0046] For example, Figure 3 As shown, a turntable is provided between the transmission part of the adjusting ring and the placement groove, the turntable is sleeved on the rotating shaft, and the turntable is connected to the placement groove, a plurality of grooves arranged at intervals are provided on the turntable, and a marble piece matching with any one of the grooves is provided on the adjusting ring; wherein, the number and interval angles of the grooves correspond to the scale values ​​on the adjusting ring, specifically, the marble piece includes a marble tube, marbles, and a spring arranged between the bottom of the marble tube and the marbles, the spring presses the marbles against the turntable, and the turntable and the marbles are preferably made of stainless steel; through such a design, when the adjusting ring rotates, the marble piece is driven to rotate, and when the marble piece rotates to the groove, the marble collides with the groove under the elastic force of the spring, and makes a metal collision sound, giving the user sound feedback of the rotation, so that the user knows the number of rotation grids, and when the adjusting ring is rotated, a damping feeling is generated, thereby improving the user's experience when rotating.

[0047] It should also be noted that a receiving cylinder is provided at the discharge end of the bean grinding cylinder. Specifically, the receiving cylinder is threadedly connected to the bean grinding cylinder to facilitate the loading and collection of powder. A plurality of anti-slip strips are provided on the outer side walls of the bean grinding cylinder and the receiving cylinder.

[0048] In the description of the present invention, 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 a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A coffee bean grinder, characterized in that: It comprises a bean grinding cylinder, an adjusting ring, a grinding assembly, a transmission assembly and a driving assembly; the bean grinding cylinder is provided with a bean grinding chamber, the adjusting ring is rotatably arranged on the bean grinding cylinder, and the adjusting ring is provided with a feeding port communicated with the bean grinding chamber; The grinding assembly comprises an inner grinding wheel and an outer grinding wheel for grinding beans, the outer grinding wheel is arranged at the discharge end of the bean grinding cylinder, a grinding gap is arranged between the inner grinding wheel and the outer grinding wheel, and the adjusting ring is used to adjust the grinding gap; The transmission assembly includes a transmission member and a rotating shaft, one end of the rotating shaft is connected to the inner grinding wheel, the other end of the rotating shaft is inserted into the transmission member and is slidably connected to the driving assembly, the driving assembly is detachably arranged on the bean grinding cylinder and can move along the axial direction of the rotating shaft, the driving assembly can drive the rotating shaft to rotate on the transmission member, the adjusting ring is connected to the transmission member, and can drive the transmission member to move along the axial direction of the rotating shaft.

2. The coffee bean grinder according to claim 1, characterized in that: A guide structure is provided between the transmission member and the rotating shaft.

3. The coffee bean grinder according to claim 1, characterized in that: It also includes a connecting piece, one end of which is connected to the driving assembly, and the other end of which is connected to the adjusting ring. The connecting piece is provided with a limiting hole that matches the shape of the rotating shaft.

4. The coffee bean grinder according to claim 3, characterized in that: The adjusting ring is arranged at the feeding end of the bean grinding cylinder, and the adjusting ring is provided with a plug hole plugged with the connecting piece, the diameter of the plug hole close to the rotating shaft is smaller than the diameter of the end away from the rotating shaft, and the plug hole matches the shape of the connecting piece.

5. The coffee bean grinder according to claim 4, characterized in that: The driving assembly includes a handle, one end of the connecting member is connected to the handle, and the limiting hole is arranged at the other end of the connecting member.

6. The coffee bean grinder according to claim 5, characterized in that: The driving assembly further comprises a mounting structure connected to the handle, wherein the mounting structure is rotatably disposed on the bean grinding cylinder, and one end of the connecting member is provided with a mounting groove which is plug-fitted with a driving shaft of the mounting structure.

7. The coffee bean grinder according to claim 6, characterized in that: The mounting structure includes a mounting seat, a telescopic handle and a handle portion, wherein the mounting seat is arranged on the bean grinding cylinder, one end of the telescopic handle is rotatably connected to the telescopic handle, and the other end of the telescopic handle is connected to the handle portion, and when the telescopic handle is tightly attached to the mounting seat, the handle portion is located below the telescopic handle.

8. The bean grinder as claimed in claim 4, wherein the drive assembly comprises a drive motor and a mounting structure for mounting the drive motor on the bean grinding cylinder, one end of the connecting member is provided with a mounting groove for plugging with the drive shaft of the drive motor, and the limiting hole is provided at the other end of the connecting member.

9. The coffee bean grinder according to claim 1, characterized in that: The bean grinding cylinder is provided with a locking assembly for locking the adjustment ring, and the locking assembly includes a locking column and a movable seat. The bean grinding cylinder is provided with a locking groove, and the movable seat is arranged in the locking groove and can move along the length direction of the bean grinding cylinder. One end of the locking column is connected to the movable seat, and the adjustment ring is provided with a plurality of positioning grooves arranged at intervals, and the other end of the locking column is plugged into and matched with any one of the positioning grooves.

10. The coffee bean grinder according to claim 1, characterized in that: An adjusting end plate is threadedly connected to one end of the rotating shaft connected to the outer grinding wheel, a dial is connected to the bottom of the outer grinding wheel, and the adjusting end plate presses the dial onto the outer grinding wheel. The outer diameter of the bottom surface of the outer grinding wheel is not less than the inner diameter of the bottom surface of the inner grinding wheel.

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