Coaxiality maintaining assembly, grinding device and bean grinder

Abstract

The utility model discloses a kind of grinder, especially design a coaxial degree maintaining assembly, grinding device and grinder, the coaxial degree maintaining assembly is sleeved in the connecting shaft of grinder assembly, when the inner cutter head of grinder assembly rotates and cooperates outer cutter to grind coffee beans, when the arbitrary radial force that the coaxial degree maintaining assembly is used to inner cutter head is greater than the force in opposite direction, it can be positioned to connecting shaft in the local range along the radial direction of inner cutter head, make inner cutter head produce local displacement in the opposite direction of this radial force. Compared with prior art, therefore, when inner cutter head rotates and cooperates outer cutter to grind coffee beans, not only can guarantee that the effort of each part of inner cutter head and outer cutter is substantially same, so that coffee beans in different positions of grinding area all have same grinding degree, but also unnecessary wear caused by local excessive effort when inner cutter head and outer cutter grind coffee beans can be prevented, improve the grinding precision when coffee beans are ground.

Description

Technical Field

[0001] Some embodiments of this utility model relate to a coffee grinder, specifically a coaxiality maintaining component, a grinding device, and a coffee grinder. Background Technology

[0002] Portable coffee grinders, as a type of portable device that grinds coffee beans into coffee powder, are small in size and easy to carry, allowing users to enjoy freshly ground coffee anytime, anywhere. Currently, some portable coffee grinders require adjusting the grind setting using an adjustment mechanism, such as an adjustment ring, located on the main body of the grinder. Rotating the adjustment ring adjusts the grinding gap of the grinding components, thereby achieving the purpose of adjusting the grind setting.

[0003] Furthermore, because the inner and outer blades of current coffee grinders often concentrate the coffee beans in a certain area during grinding, rather than distributing them evenly throughout the grinding area, this results in only one or a few areas of the blades experiencing greater stress, while the rest experience less stress. This leads to an altered grind size between the areas with less stress and those with more stress, affecting the taste of the brewed coffee. Moreover, due to the varying distribution of the coffee beans within the grinding area, after prolonged use, the areas of the inner and outer blades that experience greater stress will wear down significantly more than the areas with less stress, further impacting the grinding precision of the coffee beans. Utility Model Content

[0004] The purpose of this invention is to design a coaxiality maintaining component, a grinding device, and a coffee grinder. Regardless of how the coffee beans are distributed in the grinding area, the inner and outer blades of the grinding component can ensure that the coffee beans distributed in different positions in the grinding area have the same degree of grinding when grinding the coffee beans. Furthermore, it can improve the grinding accuracy of the coffee beans, thereby ensuring the taste of the coffee when brewing.

[0005] To achieve the above objectives, some embodiments of this utility model provide a coaxiality retention component. The coaxiality retention component is sleeved on the connecting shaft of the coffee grinder assembly. When the inner blade of the coffee grinder assembly rotates to grind coffee beans in conjunction with the outer blade, the coaxiality retention component is used to position the connecting shaft within a local range along the radial direction of the inner blade when any radial force on the inner blade is greater than the force in the opposite direction, so that the inner blade produces a local displacement in the opposite direction of the radial force.

[0006] In addition, some embodiments of this utility model also provide a grinding device, the grinding device comprising:

[0007] A cutter head support; the cutter head support includes: an upper frame and a lower frame arranged opposite to each other along a preset axis, and a connecting frame connecting the upper frame and the lower frame;

[0008] A coffee grinding assembly is disposed within the lower frame body; the coffee grinding assembly includes: an outer blade disc, an inner blade disc opposite to the outer blade disc, and a connecting shaft connected to the inner blade disc; wherein, the outer blade disc, the inner blade disc, and the connecting shaft are all coaxially arranged along a preset axial direction;

[0009] A drive device, connected to the connecting shaft, is used to drive the inner cutter head to rotate relative to the outer cutter head via the connecting shaft;

[0010] The coaxiality retention assembly as described above; wherein at least a portion of the coaxiality retention assembly is disposed within the upper frame body and sleeved on the connecting shaft, such that the connecting shaft is connected to the inner cutter head along the preset axial direction.

[0011] In addition, some embodiments of this utility model also provide a coffee grinder, including:

[0012] The grinding apparatus as described above.

[0013] Compared with the prior art, the embodiments of this utility model have a coaxiality retention component sleeved on the connecting shaft connecting the grinding assembly and the inner blade disc. Therefore, when the inner blade disc rotates to grind coffee beans with the outer blade disc, the coaxiality retention component can position the connecting shaft within a local range along the radial direction of the inner blade disc when any radial force on the inner blade disc is greater than the force in the opposite direction. This allows the inner blade disc to undergo local displacement in the opposite direction of the radial force, thereby ensuring that the stress on each part of the inner and outer blade discs is basically the same, so that coffee beans in different positions of the grinding area have the same grind degree, ensuring the taste of coffee during brewing. It also prevents unnecessary wear caused by excessive local stress on the inner and outer blade discs when grinding coffee beans, thus improving the grinding accuracy of coffee beans. Attached Figure Description

[0014] Figure 1 This is an isometric view of the grinding device in some embodiments of the present invention;

[0015] Figure 2 This is an isometric view of the top of the grinding device in some embodiments of the present invention;

[0016] Figure 3 for Figure 1 A top-down view;

[0017] Figure 4 for Figure 3 Schematic diagram of the cross section of AA;

[0018] Figure 5 This is a schematic diagram showing the connection state between the connecting shaft and each bearing sleeve when the bushing is a bearing sleeve and the radial forces on the cutter disc are evenly distributed in the grinding area.

[0019] Figure 6 This is a schematic diagram showing the connection state between the connecting shaft and each bearing sleeve when each bushing is a bearing sleeve and the radial force on the right side of the cutter head is greater than the radial force on the left side, in some embodiments of this utility model.

[0020] Figure 7 In some embodiments of this utility model, each bushing includes an annular outer bushing, an annular inner bushing, and several elastic elements, and the radial forces on the cutter disc in each direction are evenly distributed in the grinding area, which is a schematic diagram of the connection state between the connecting shaft and each bearing sleeve.

[0021] Figure 8 In some embodiments of this utility model, each bushing includes an annular outer bushing, an annular inner bushing, and several elastic elements, and the connection between the connecting shaft and each bearing sleeve is shown in the following schematic diagram when the radial force on the right side of the cutter head is greater than the radial force on the left side.

[0022] Figure 9 This is an isometric view of the coffee grinder in some embodiments of the present invention. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been presented in the various embodiments of this utility model to enable the reader to better understand this application. However, the technical solutions claimed in this application can be implemented even without these technical details and with various changes and modifications based on the following embodiments.

[0024] Example 1

[0025] The first embodiment of this utility model relates to a coaxiality maintaining component, such as... Figure 4 As shown, the coaxiality retaining component 1 is sleeved on the connecting shaft 21 of the grinding assembly 2. When the inner blade 22 of the grinding assembly 2 rotates to grind coffee beans in conjunction with the outer blade 23, the coaxiality retaining component 1 can position the connecting shaft 21 in a local range along the radial direction of the inner blade 22 when any radial force on the inner blade 22 is greater than the force in the opposite direction, so that the inner blade 22 will have a local displacement in the opposite direction of the radial force.

[0026] As can be seen from the above, since the coaxiality retaining component 1 is sleeved on the connecting shaft 21 connecting the grinding assembly 2 and the inner blade 22, when the inner blade 22 rotates to grind coffee with the outer blade 23, the coaxiality retaining component 1 can position the connecting shaft 21 locally along the radial direction of the inner blade 22 when any radial force on the inner blade 22 is greater than the force in the opposite direction. This allows the inner blade 22 to undergo local displacement in the opposite direction of the radial force, thus ensuring that the stress on each part of the inner blade 22 and the outer blade 23 is basically the same, so that coffee beans in different positions of the grinding area have the same grind degree, ensuring the taste of coffee during brewing. It can also prevent unnecessary wear caused by excessive local stress on the inner and outer blades when grinding coffee beans, thus improving the grinding accuracy of coffee beans.

[0027] Specifically, in some embodiments, such as Figure 4 As shown, the coaxiality maintaining assembly 1 includes a plurality of bushings 11, each bushing 11 being coaxially arranged along a preset axial direction and sleeved onto a connecting shaft 21 connected to the inner cutter head 22. Each bushing 11 allows the connecting shaft 21 to connect to the inner cutter head 22 along the preset axial direction. Furthermore, each bushing 11 has a space for radial local displacement of the connecting shaft 21. Meanwhile, to ensure the positioning performance of each bushing 11 on the connecting shaft 21, in some embodiments, such as... Figure 4 As shown, at least one bushing 11 may be disposed at the end of the connecting shaft 21 away from the inner cutter head 22, while at least another bushing 11 is disposed on the connecting shaft 21 toward the inner cutter head 22. The connecting shaft 21 can be circumferentially positioned by at least two bushings 11. Furthermore, as a preferred embodiment, in some embodiments, such as... Figure 4 As shown, three bushings 11 can be provided, and the positioning performance of the connecting shaft 21 can be further improved by using three bushings 11.

[0028] Furthermore, it should be noted that in some embodiments, each bushing 11 is clearance-fitted with the connecting shaft 21, such that the movement space of any bushing 11 is located between the bushing 11 and the connecting shaft. That is, after each bushing 11 is fitted onto the connecting shaft 21, it can form a movement space with the connecting shaft 21. For example, in some embodiments, such as Figure 5 and Figure 6 As shown, each bushing 11 can be a bearing sleeve, and the outer liner of the bearing sleeve is fixed and cannot rotate, while the inner liner of the bearing sleeve is connected to the connecting shaft 21 and has a clearance fit with the connecting shaft 21. Therefore, when the inner blade 22 of the grinding assembly 2 grinds coffee beans in conjunction with the outer blade 23, if the coffee beans are concentrated on the left side of the grinding area, that is, when the radial force on the left side of the inner blade 22 in the grinding area is greater than the radial force on the right side, such as... Figure 6As shown, at this time, the inner blade 22 will undergo a local displacement to the right under the action of the radial force on the left, while the connecting shaft 21 can tilt to the left as a whole when the inner blade 22 moves to the right, thereby effectively reducing the radial force on the left side of the inner blade 22 and the outer blade 23. And as the inner blade 22 rotates, and the coffee beans are evenly distributed in the grinding area, as... Figure 5 As shown, at this time, the radial forces on the inner blade 22 in the grinding area are basically the same in all directions, so that the inner blade 22 can return to its original position, thereby ensuring that the grinding assembly 2 has a basically the same grinding degree on coffee beans distributed in different positions in the grinding area.

[0029] However, as an alternative, in some other embodiments, such as Figure 7 and Figure 8 As shown, each bushing 11 may also include: an annular outer bushing 111, an annular inner bushing 112, and a plurality of elastic members 113. The annular inner bushing 112 is disposed within the annular outer bushing 111 and coaxially arranged with the annular outer bushing 111 along a predetermined axial direction. Furthermore, the annular inner bushing 112 is also used for insertion into the connecting shaft 21 of the grinding assembly 2, so that the annular inner bushing 112 can be coaxially fixed with the connecting shaft 21. Additionally, as... Figure 7 and Figure 8 As shown, a movable space 114 is formed between the annular outer liner 111 and the annular inner liner 112, allowing each of the plurality of elastic members 113 to be disposed between the annular outer liner 111 and the annular inner liner 112. Furthermore, each elastic member 113 can roll with the annular inner liner 112 and is used to allow the annular inner liner 112 to rotate relative to the annular outer liner 111. Therefore, as... Figure 7 and Figure 8 As shown, the annular liner 112 can be used to compress the elastic elements 133 in the radial direction when the inner cutter head 112 is subjected to any radial force greater than the force in the opposite direction, so that the annular liner 112 can produce a local displacement in the opposite direction of the radial force. For example, in some embodiments, such as Figure 7 and Figure 8 As shown, the connecting shaft 21 can be interference-fitted with the annular inner liner 112 of the bushing 11. Therefore, when the inner blade 22 of the grinding assembly 2 grinds coffee beans in conjunction with the outer blade 23, if the coffee beans are concentrated on the left side of the grinding area, that is, when the radial force on the left side of the inner blade 22 in the grinding area is greater than the radial force on the right side, ... Figure 8 As shown, at this time, the inner blade disc 22 will undergo a local displacement to the right under the action of the radial force on the left. Meanwhile, the annular liner 112 will compress at least one elastic element 113 on the right side under the displacement of the inner blade disc 22. At this time, the connecting shaft 21 can tilt to the left as a whole when the inner blade disc 22 moves to the right, thereby effectively reducing the radial force on the left side of the inner blade disc 22 and the outer blade disc 23. As the inner blade disc 22 rotates, the coffee beans can be evenly distributed in the grinding area, such as... Figure 7 As shown, at this time, the radial forces on the inner blade 22 in the grinding area are basically the same in all directions, so that the inner blade 22 can return to its original position under the rebound action of at least one elastic element 113 on the right side, thereby ensuring that the grinding assembly 2 can have basically the same grinding degree on coffee beans distributed in different positions in the grinding area.

[0030] Furthermore, it should be noted that, in order to ensure that each elastic element 113 can not only collapse under the compression of the annular inner liner 112, but also roll with the annular inner liner 112, in some embodiments, such as Figure 7 and Figure 8 As shown, each elastic element 113 includes: a spring 1131, a mounting base 1132 disposed at one end of the spring 1131, and a ball bearing 1133 partially embedded in the mounting base 1132 and tactilely connected to the mounting base 1132. Wherein, as... Figure 7 and Figure 8 As shown, the end of the spring 1131 away from the mounting base 1132 is fixedly connected to the annular outer liner 111, while the ball bearing 1133 abuts against the annular inner liner 112 and rolls with the annular inner liner 112, so that the annular inner liner 112 can rotate relative to the annular outer liner 111 under the rotational movement of the connecting shaft 21, thereby realizing the grinding of coffee beans.

[0031] Example 2

[0032] Embodiment 2 of this utility model relates to a grinding device, such as... Figure 1 and Figure 2 As shown, the grinding device includes: a blade holder 3, a grinding assembly 2, a drive device 4, and a coaxiality maintaining assembly 1 as described in Embodiment 1.

[0033] Among them, such as Figure 1 and Figure 2 As shown, the cutter head support 3 includes: an upper frame 31 and a lower frame 32 arranged opposite to each other along a preset axis, and a connecting frame 33 connecting the upper frame 31 and the lower frame 32. Secondly, combined with... Figure 4 As shown, the coffee grinding assembly 2 is disposed inside the lower frame 32, and the coffee grinding assembly 2 includes: an outer blade 23, an inner blade 22 opposite to the outer blade 23, and a connecting shaft 21 connected to the inner blade 22. The outer blade 23, the inner blade 22 and the connecting shaft 21 are all coaxially arranged along a preset axis direction, and a grinding area for grinding coffee beans is formed between the inner blade 22 and the outer blade 23.

[0034] Additionally, in some embodiments, such as Figure 4As shown, the drive device 4 is connected to the connecting shaft 21. The drive device 4 is used to drive the inner blade 22 to rotate relative to the outer blade 23 via the connecting shaft 21, so that the inner blade 22 can cooperate with the outer blade 23 to grind the coffee beans entering the grinding area. Finally, at least part of the coaxiality maintaining component 1 is disposed in the upper frame 31 and sleeved on the connecting shaft 21, so that the connecting shaft 21 is connected to the inner blade 22 along a preset axial direction.

[0035] As can be seen from the above, when the drive device 4 drives the inner blade 22 to rotate relative to the outer blade 23 via the connecting shaft 21, the coaxiality holding component 1 can position the inner blade 22 radially. Furthermore, during the grinding process, when any radial force on the inner blade 22 is greater than the force in the opposite direction, the coaxiality holding component 1 can position the connecting shaft 21 within a local range along the radial direction of the inner blade 22, allowing the inner blade 22 to undergo local displacement in the opposite direction of the radial force. This not only ensures that the stress on each part of the inner blade 22 and the outer blade 23 is basically the same, so that coffee beans in different positions of the grinding area have the same grind degree, ensuring the taste of the coffee during brewing, but also prevents unnecessary wear caused by excessive local stress on the inner and outer blades when grinding coffee beans, thus improving the grinding accuracy of the coffee beans.

[0036] Furthermore, it is clear from the above analysis of Embodiment 1 that since the coaxiality maintaining assembly 1 includes multiple bushings 11, at least one bushing 11 can be disposed within the upper frame 31. Preferably, two bushings 11 can be disposed within the upper frame 31. Moreover, to enable the upper frame 31 to secure the two bushings 11, in some embodiments, such as... Figure 4 As shown, the upper frame 31 includes, around a preset axis, an inner wall 311 forming an accommodating space 314, an outer wall 312 opposite to the inner wall 311, and an annular protrusion 313 protruding from the inner wall 311. The annular protrusion 313 divides the accommodating space 314 into an upper mounting groove 3141 and a lower mounting groove 3142, and the upper mounting groove 3141 and the lower mounting groove 3142 can be used to install bushings 11 respectively.

[0037] Furthermore, in order to enable the lower frame 32 to be installed on the grinding assembly 2, in some embodiments, the lower frame 32 may also be arranged opposite to the upper frame 31 along a preset axial direction, and such as Figure 4As shown, the lower frame 32 includes: an inner shell 322 forming a mounting hole 321 around a preset axis, an outer shell 323 opposite to the inner shell 322, and a connecting wall 324 connecting the inner shell 322 and the outer shell 323. The connecting wall 324 extends inclined or bent from the side connected to the outer shell 323 to the side connected to the inner shell 322, moving away from the upper frame 31. This makes the side of the connecting wall 324 opposite to the upper frame 31 a guide surface 3241. This guide surface 3241 guides coffee beans into the grinding area of ​​the grinding assembly 2, effectively preventing coffee beans from accumulating on the lower frame 31 during bean dropping, thus ensuring the continuity of coffee bean dropping and not affecting the grinding of coffee beans by the grinding assembly 2. Additionally, it is worth noting that in some embodiments, such as... Figure 1 , Figure 3 and Figure 4 As shown, the connecting frame 33 includes several connecting rods 331, one end of each connecting rod 331 is connected to the guide surface 3241, and the other end of each connecting rod 331 is connected to the outer wall 312 of the upper frame 32. Therefore, under the connection of each connecting rod 331, the upper frame 31 and the lower frame 32 can be coaxially arranged along a preset axis direction to meet the connection and positioning requirements of each bushing 11 to the connecting shaft 21.

[0038] Additionally, as a preferred embodiment, in other embodiments, such as Figure 1 , Figure 2 and Figure 3 As shown, the grinding device also includes: a lifting rod 5 and an adjusting component 6. The lifting rod 5 is partially inserted into the connecting shaft 21 along a preset axial direction, thus allowing the driving device 4 to be placed inside the lifting rod 5. This enables the driving device 4 to be directly connected to the connecting shaft 21 inserted into the lifting rod 5 and to directly drive the connecting shaft 21 to rotate. Secondly, as... Figure 2 and Figure 3 As shown, the adjusting component 6 is connected to the lifting rod 5. This adjusting component 6 can drive the lifting rod 5 to move along its axial direction, allowing the lifting rod 5 to adjust the grinding gap between the inner blade disc 22 and the outer blade disc 23. Furthermore, it is easy to see from the solution in Embodiment 1 that when the number of bushings 11 is greater than two, such as three, ... Figure 4 As shown, the lifting rod 5 includes: a base 51 and at least one sidewall 52 arranged around the base 51. The base 51 can be used to install a third bushing 11, and each sidewall 52 forms a receiving space 53 on the base 51 for installing the drive device 4. A washer 54 is also provided in the receiving space 53, which is sleeved on the connecting shaft 21 and is also snapped into the connecting shaft 21. This allows the bushing 11, located in the base 51, to be fixed to the connecting shaft 21 along its axial direction. Therefore, when the adjusting assembly 6 drives the lifting rod 5 to move along its axial direction, as... Figure 2 , Figure 3 and Figure 4 As shown, the lifting rod 5 can synchronously drive the inner blade 22 to move relative to the outer blade 23 through the connecting shaft 21, thereby adjusting the grinding gap between the inner blade 22 and the outer blade 23.

[0039] Specifically, such as Figure 2 and Figure 3 As shown, the adjusting assembly 6 includes: an external gear ring 61, an adjusting ring 62, and a transmission gear 63. The external gear ring 61 can be sleeved on each side wall 52, and the external gear ring 61 is rotatable relative to the lifting rod 5. Furthermore, in conjunction with... Figure 1 and Figure 2 As shown, the external gear ring 61 is screwed into each sidewall 52 by threads, and in addition, it is combined with... Figure 9 As shown, the adjusting ring 62 is sleeved on the main housing 20 of the coffee grinder, and the adjusting ring 62 is also coaxially arranged with the outer gear ring 61. Furthermore, the adjusting ring 62 is rotatable relative to the main housing 20. It is worth noting that, as... Figure 2 and Figure 3 As shown, an internal gear ring 64 is also provided on the inner side of the adjusting ring 62 around its axis. Therefore, the transmission gear 63 can be positioned between the internal gear ring 64 and the external gear ring 61, so that the transmission gear 63 can mesh with the internal gear ring 64 and the external gear ring 61 respectively. Thus, when it is necessary to adjust the grinding gap of the grinding assembly 2, combined with... Figure 2 It can be seen that the user can directly rotate the adjusting ring 62, and the transmission gear 63 can drive the outer gear ring 61 to rotate synchronously in the opposite direction to the adjustment ring 62 when the adjusting ring 62 is rotated, by using the meshing transmission relationship with the inner gear ring 64 and the outer gear ring 61 respectively. This allows the lifting rod 5 to change the rotation of the outer gear ring 61 into a linear motion along its own axis by relying on its own thread engagement with the outer gear ring 61. This can drive the inner blade 22 to move relative to the outer blade 23, so as to adjust the grinding gap of the grinding assembly 2.

[0040] Additionally, in other embodiments, such as Figure 2 and Figure 4 As shown, the grinding assembly 2 also includes a spring-loaded component 24, which is sleeved on the connecting shaft 21. One end of the spring-loaded component 24 abuts against the upper frame 31 along a preset axis, while the other end of the spring-loaded component 24 is connected to the inner blade disc 22. For example, in some embodiments, combined with... Figure 4As shown, the spring-loaded member 24 can be a spring, allowing it to act on the inner blade disc 22. Therefore, when the inner blade disc 22 and outer blade disc 23 grind coffee beans, the spring-loaded member 24 allows the inner blade disc 22 to float relative to the outer blade disc 23 according to the axial force generated during grinding, thereby further improving the grinding accuracy of the grinding assembly 2. Furthermore, to ensure better grinding of the coffee beans by the grinding assembly 2, in some embodiments, such as... Figure 4 As shown, along the preset axial direction, at least one coarse grinding zone 25 for crushing coffee beans and at least one fine grinding zone 26 for grinding the crushed coffee beans are formed between the inner blade 22 and the outer blade 23. The coffee beans can be crushed by each coarse grinding zone 25, and the crushed coffee beans can be finely ground by each fine grinding zone 26. Furthermore, the coffee beans can be ground step by step by each coarse grinding zone 25 and each fine grinding zone 26, which can greatly reduce the wear of the inner and outer blades of the coffee grinding assembly 2 during coffee grinding.

[0041] Example 3

[0042] Embodiment 3 of this utility model relates to a coffee grinder, such as... Figure 9 As shown, the coffee grinder includes a grinding device as described in Example 2.

[0043] Those skilled in the art will understand that the above embodiments are specific implementations of the present invention, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A coaxiality maintaining assembly, characterized in that, The coaxiality retention component (1) is sleeved on the connecting shaft (21) of the grinding assembly (2). When the inner blade (22) of the grinding assembly (2) rotates to cooperate with the outer blade (23) to grind coffee beans, the coaxiality retention component (1) is used to position the connecting shaft (21) in a local range along the radial direction of the inner blade (22) when any radial force on the inner blade (22) is greater than the force in the opposite direction, so that the inner blade (22) produces a local displacement in the opposite direction of the radial force.

2. The coaxiality maintaining assembly according to claim 1, characterized in that, The coaxiality maintaining assembly (1) includes: A plurality of bushings (11) are provided, each bushing (11) being coaxially arranged along a preset axis and all being sleeved on a connecting shaft (21) connected to the inner cutter disc (22), for the connecting shaft (21) to connect to the inner cutter disc (22) along the preset axis; Each bushing (11) has a space for the connecting shaft (21) to generate radial local displacement.

3. The coaxiality maintaining assembly according to claim 2, characterized in that, At least one bushing (11) is disposed at one end of the connecting shaft (21) away from the inner cutter head (22), and at least another bushing (11) is disposed on the connecting shaft (21) in a direction close to the inner cutter head (22).

4. The coaxiality maintaining assembly according to claim 2 or 3, characterized in that, Each bushing (11) is clearance-fitted with the connecting shaft (21), such that the movable space of any bushing (11) is located between the bushing (11) and the connecting shaft (21).

5. The coaxiality maintaining assembly according to claim 2 or 3, characterized in that, Each of the bushings (11) includes: Annular outer liner (111); An annular inner liner (112) is disposed inside the annular outer liner (111) and is coaxially disposed with the annular outer liner (111) along the preset axis direction; the annular inner liner (112) is used to be inserted into the connecting shaft (21) and is coaxially fixed with the connecting shaft (21); wherein, the annular outer liner (111) and the annular inner liner (112) form the movable space; A plurality of elastic elements (113) are disposed between the annular outer liner (111) and the annular inner liner (112) and are in rolling engagement with the annular inner liner (112); each of the elastic elements (113) is used to allow the annular inner liner (112) to rotate relative to the annular outer liner (111); The annular liner (112) is used to compress each of the elastic elements (113) in the radial direction when the inner cutter disc (22) is subjected to any radial force greater than the force in the opposite direction, so that the annular liner (112) will produce a local displacement in the opposite direction of the radial force.

6. A grinding apparatus, characterized in that, The grinding apparatus includes: The cutter head support (3) includes: an upper frame (31) and a lower frame (32) arranged opposite to each other along a preset axis, and a connecting frame connecting the upper frame (31) and the lower frame (32); A coffee grinding assembly (2) is disposed within the lower frame (32); the coffee grinding assembly (2) includes: an outer blade disc (23), an inner blade disc (22) opposite to the outer blade disc (23), and a connecting shaft (21) connected to the inner blade disc (22); wherein the outer blade disc (23), the inner blade disc (22) and the connecting shaft (21) are all coaxially arranged along a preset axis direction; A drive device (4) is connected to the connecting shaft (21) and is used to drive the inner cutter head (22) to rotate relative to the outer cutter head (23) via the connecting shaft (21); The coaxiality retaining component (1) as described in any one of claims 1-5; wherein at least a portion of the coaxiality retaining component (1) is disposed within the upper frame (31) and sleeved on the connecting shaft, such that the connecting shaft (21) is connected to the inner cutter head (22) along the preset axial direction.

7. The grinding apparatus according to claim 6, characterized in that, The coaxiality maintaining assembly (1) includes: a plurality of bushings (11), wherein at least one of the bushings (11) is disposed within the upper frame (31); the grinding device further includes: The lifting rod (5) is inserted into the connecting shaft (21) along the preset axis direction; wherein at least one of the bushings (11) is disposed in the lifting rod (5) and connected to the connecting shaft (21), so that the connecting shaft (21) is rotatable relative to the lifting rod (5); An adjustment component is connected to the lifting rod (5) and is used to drive the lifting rod (5) to move along its axial direction so that the lifting rod (5) adjusts the grinding gap between the inner blade (22) and the outer blade (23); The drive device (4) is located inside the lifting rod (5), so that the connecting shaft (21) is connected to the drive device (4).

8. The grinding apparatus according to claim 6, characterized in that, The grinding assembly (2) also includes: The spring-loaded component (24) is sleeved on the connecting shaft (21); one end of the spring-loaded component (24) along the preset axis abuts against the upper frame (31), and the other end is connected to the inner cutter disc (22); The spring-loaded component (24) acts on the inner blade disc (22) to cause the inner blade disc (22) to float relative to the outer blade disc (23) when the inner blade disc (22) and the outer blade disc (23) grind coffee beans.

9. The grinding apparatus according to claim 6, characterized in that, Along the preset axial direction, at least one coarse grinding zone (25) for crushing coffee beans and at least one fine grinding zone (26) for grinding the crushed coffee beans are formed between the inner blade (22) and the outer blade (23).

10. A coffee grinder, characterized in that, include: The grinding apparatus as described in any one of claims 6-9.

Images