Lifting lever, grind adjustment device and bean grinder

Abstract

The utility model discloses an embodiment relates to a bean grinder, especially designs a lifting rod, grinding degree adjusting device and bean grinder, the lifting rod can linear motion along its axial direction, is used for adjusting the bean grinding gap of bean grinder's bean grinding assembly, and the lifting rod includes: connecting seat, at least one side wall, transmission structure and support piece, the connecting seat is used for the rotary connection between the lifting rod and the bean grinding assembly, each side wall is around the circumferential setting of connecting seat, and is surrounded and is formed in the accommodation space on the connecting seat, transmission structure is arranged on each side wall, and transmission structure is connected with the adjusting assembly of bean grinder, and the support piece at least has partial insertion in the accommodation space, and at least with one side wall can detachable connection, and the support piece is also used for around the circumferential support of each side wall of connecting seat. Compared with prior art, the downward force that the bean grinding assembly produces to the lifting rod when grinding beans, will not cause each side wall to the inside of accommodation space to produce deformation, thereby guaranteeing the precision of adjusting assembly when adjusting the grinding degree of bean grinding assembly.

Description

Technical Field

[0001] Some embodiments of this utility model relate to a coffee grinder, specifically designed with a lifting rod, a grind adjustment device, and the coffee grinder itself. 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, since there is generally a lifting rod and a corresponding adjustment component between the adjustment component and the grinding assembly, by operating the adjustment component, such as rotating the adjustment ring on the adjustment component, the adjustment component can change the rotation of the adjustment ring into the linear motion of the lifting rod, thereby changing the grinding gap of the grinding assembly.

[0004] However, the inventors discovered that in order to ensure that the linear motion of the lifting rod does not interfere with the rotational motion of the inner burr of the grinding assembly, the lifting rod is generally designed as a bushing, that is, the inside of the lifting rod is a hollow structure, and this hollow structure is used to install the drive device that drives the rotation of the burr. Therefore, when the drive device drives the inner burr of the grinding assembly to rotate and grind the coffee beans, the inner burr will exert a downward force on the lifting rod due to the wedging of the coffee beans. At this time, the top of the lifting rod is restrained by the connection with the adjustment component, thus generating an upward pulling force. As a result, the side wall of the lifting rod often deforms towards the inner hollow area due to the force generated at both ends. This deformation can easily affect the stability of the connection between the adjustment component and the lifting rod. For example, when the adjusting component and the lifting rod are connected by a threaded connection, that is, the adjusting component and the lifting rod are connected by a screw drive-like mechanism, the side wall of the lifting rod may deform, causing tooth loss or stripping between it and the adjusting component. This will affect the accuracy of adjusting the grinding degree of the grinding component. In severe cases, the lifting rod may even completely disengage from the transmission mechanism due to the large downward force of the grinding component during grinding, resulting in blade detachment during grinding. This will not only damage the grinding component, the lifting rod, and other related components, but also easily cause safety hazards if the blade detaches during grinding. Utility Model Content

[0005] The purpose of this invention is to design a lifting rod, a grinding degree adjustment device, and a coffee grinder, which prevents the force exerted on the lifting rod by the grinding component during grinding from causing deformation of the lifting rod. This improves the stability of the connection between the adjustment component and the lifting rod and ensures the accuracy of the adjustment component when adjusting the grinding degree of the grinding component through the lifting rod.

[0006] To achieve the above objectives, some embodiments of this utility model provide a lifting rod that can move linearly along its axial direction, used to adjust the grinding gap of the grinding assembly of a coffee grinder. The lifting rod includes:

[0007] A connecting seat is used for a rotatable connection between the lifting rod and the grinding assembly, allowing the grinding assembly to rotate relative to the connecting seat;

[0008] At least one sidewall is arranged circumferentially around the connecting seat, and each of the sidewalls forms an accommodating space on the connecting seat, the accommodating space being used to accommodate the drive unit of the coffee grinder;

[0009] A transmission structure is disposed on each of the side walls and connected to the adjustment component of the coffee grinder. The transmission structure is used to drive the lifting rod to move linearly along its axial direction under the drive of the adjustment component.

[0010] A support member, at least partially inserted into the accommodating space, and detachably connected to at least one of the side walls; the support member is used to circumferentially support each of the side walls around the connecting seat.

[0011] In addition, some embodiments of this utility model also provide a grinding degree adjustment device, including:

[0012] The lifting rod as described above; wherein the connecting seat of the lifting rod is rotatably connected to the connecting shaft of the grinding assembly, so that the connecting shaft is rotatable relative to the lifting rod;

[0013] An adjustment component, connected to the transmission structure of the lifting rod, is used to drive the lifting rod to move linearly along its axial direction via the transmission structure, thereby adjusting the grinding gap of the grinding assembly.

[0014] In addition, some embodiments of this utility model also provide a coffee grinder, including:

[0015] The grinding degree adjustment device as described above;

[0016] A coffee grinding assembly; the coffee grinding assembly includes, along the axial direction of the lifting rod: an outer blade disc, an inner blade disc opposite to the outer blade disc, and a connecting shaft connected to the outer blade disc or the inner blade disc;

[0017] A driving device is disposed within the accommodating space and coaxially connected to the connecting shaft, for driving the outer cutter head or the inner cutter head to rotate via the connecting shaft;

[0018] The connecting shaft is also slidable relative to the driving device along its own axial direction.

[0019] Compared with the prior art, the embodiments of this utility model have the following advantages: the lifting rod includes a connecting seat and at least one side wall arranged circumferentially around the connecting seat. Each side wall forms an accommodating space on the connecting seat, through which the drive device of the coffee grinder can be installed. Furthermore, since the lifting rod also includes a support member, and at least part of the support member is inserted into the accommodating space and detachably connected to at least one side wall, the detachable nature of the support member and the side wall not only does not affect the installation of the drive device in the accommodating space of the lifting rod, but also, since the support member can support each side wall circumferentially around the connecting seat, the downward force generated by the grinding assembly on the lifting rod during grinding will not cause the side walls to deform into the accommodating space. This improves the stability of the connection between the adjusting assembly and the lifting rod and ensures the accuracy of the adjusting assembly when adjusting the grinding degree of the coffee grinder through the lifting rod. Attached Figure Description

[0020] Figure 1 This is an isometric view of the lifting rod in some embodiments of the present invention;

[0021] Figure 2 This is an isometric view of the connection between the lifting rod and the grinding assembly in some embodiments of the present invention;

[0022] Figure 3 This is a cross-sectional view of the lifting rod connected to the grinding assembly in some embodiments of the present invention;

[0023] Figure 4 This is an isometric view of the grinding adjustment device and the grinding assembly when connected in some embodiments of the present invention;

[0024] Figure 5 This is an isometric view of the coffee grinder in some embodiments of the present invention;

[0025] Figure 6 This is an isometric view of the connection between the lifting rod and the grinding assembly when a driving device is installed inside the lifting rod in some embodiments of the present invention.

[0026] Figure 7 This is a cross-sectional view of the connection between the lifting rod and the grinding assembly when a driving device is installed inside the lifting rod in some embodiments of the present invention. Detailed Implementation

[0027] 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.

[0028] Example 1

[0029] The first embodiment of this utility model relates to a lifting rod, such as Figure 1 , Figure 2 and Figure 3 As shown, the lifting rod 1 can move linearly along its axis to adjust the grinding gap of the grinding assembly 2 of the coffee grinder, and, in conjunction with... Figure 1 As shown, the lifting rod 1 includes: a connecting seat 11, at least one side wall 12, a transmission structure 13, and a support member 14.

[0030] Among them, such as Figure 3 As shown, the connecting seat 11 is used for a rotatable connection between the lifting rod 1 and the grinding assembly 2, allowing the grinding assembly 2 to rotate relative to the connecting seat 11. For example, as... Figure 1 and Figure 7 As shown, a bearing 10 can be installed inside the connecting seat 11, and the bearing 10 is connected to the connecting shaft 21 of the grinding assembly 2, so that the grinding assembly 2 can rotate relative to the connecting seat 11 through the bearing 10. Secondly, as... Figure 1 and Figure 2 As shown, each sidewall 12 is arranged circumferentially around the connecting seat 11, and each sidewall 12 forms an accommodating space 15 on the connecting seat 11, and, combined with Figure 7 As shown, the accommodating space 15 is used to accommodate the drive unit 4 of the coffee grinder, so that the connecting shaft 21 of the coffee grinder assembly 2 can enter the drive unit 4 through the bearing 10 and be connected to the power output end of the drive unit 4.

[0031] In addition, such as Figure 1 and Figure 2 As shown, the transmission structure 13 is disposed on each side wall 12 and combined with Figure 4 As shown, the transmission structure 13 is connected to the adjustment component 3 of the coffee grinder, allowing the transmission structure 13 to drive the lifting rod 1 to move linearly along its axial direction under the drive of the adjustment component 3. Finally, as... Figure 1 As shown, at least part of the support member 14 is inserted into the accommodating space 15 and is detachably connected to at least one side wall 12. At the same time, the support member 14 is also used to circumferentially support each side wall 12 around the connecting seat 11.

[0032] As can be seen from the above, since the lifting rod 1 includes a connecting seat 11 and at least one side wall 12 arranged circumferentially around the connecting seat 11, and each side wall 12 forms an accommodating space 15 on the connecting seat 11, the drive device 4 of the coffee grinder can be installed through the accommodating space 15. Furthermore, since the lifting rod 1 also includes a support member 14, and at least part of the support member 14 is inserted into the accommodating space 15 and detachably connected to at least one side wall 12, the detachable nature of the support member 14 and the side wall 12 not only does not affect the installation of the drive device 4 in the accommodating space 15 of the lifting rod 1, but also, since the support member 14 can support each side wall 12 circumferentially around the connecting seat 11, the downward force generated by the coffee grinding assembly 2 on the lifting rod 1 during coffee grinding will not cause the side walls 12 to deform into the accommodating space 15. This improves the stability of the connection between the adjusting assembly 3 and the lifting rod 1 and ensures the accuracy of the adjusting assembly 3 when adjusting the grinding degree of the coffee grinding assembly 2 through the lifting rod 1.

[0033] Specifically, in some embodiments, the sidewall 12 is provided with multiple, such as... Figure 1 As shown, two side walls 12 may be provided, so that when the support member 14 is inserted into the receiving space 15, the support member 14 can expand each side wall 12 in a direction away from the receiving space 15. Furthermore, it is worth noting that, as... Figure 1 As shown, each sidewall 12 has an inner surface 121 relative to the accommodating space 15 and an outer surface 122 opposite to the inner surface 121. Meanwhile, to ensure that the adjusting assembly 3 can drive the lifting rod 1 to move linearly along its axial direction via the transmission structure 13, in some embodiments, as shown in 1, the transmission structure 13 includes external threads 131 respectively disposed on the outer surface 122 of each sidewall 12. Therefore, corresponding to the external threads 131 on the outer surface 122 of each sidewall 122, the adjusting assembly 3 can be a gear assembly composed of gears and multiple gear rings. Specifically, as shown in 1... Figure 4 As shown, the adjusting assembly 3 includes: an external gear ring 31, an adjusting ring 32, and a transmission gear 33. The external gear ring 31 can be sleeved on each side wall 12, and the external gear ring 31 is rotatable relative to the lifting rod 1. Furthermore, in conjunction with... Figure 6 and Figure 7 As shown, the inner side of the external gear ring 31 is an internal thread surface 311 that engages with the external threads 131 of each sidewall 12, while the outer side of the external gear ring 31 is an external tooth profile surface 312. Finally, combined with Figure 5 As shown, the adjusting ring 32 is sleeved on the main housing 20 of the coffee grinder, and the adjusting ring 32 is also coaxially arranged with the outer gear ring 31. Furthermore, the adjusting ring 32 can rotate relative to the main housing 20. It is worth noting that, as... Figure 4As shown, an internal gear ring 34 is also provided on the inner side of the adjusting ring 32 around its axis. Therefore, the transmission gear 33 can be positioned between the internal gear ring 34 and the outer tooth profile surface 312 of the outer gear ring 31, so that the transmission gear 33 can mesh with the internal gear ring 34 and the outer tooth profile surface 312 respectively. Thus, when it is necessary to adjust the grinding gap of the grinding assembly 2, combined with... Figure 4 It can be seen that the user can directly rotate the adjusting ring 32, and the transmission gear 33 can drive the outer gear ring 31 to rotate synchronously in the opposite direction to the adjustment ring 32 when the adjusting ring 32 is rotated, by using the meshing transmission relationship with the inner gear ring 34 and the outer gear surface 312 respectively. This allows the lifting rod 1 to change the rotation of the outer gear ring 31 into a linear motion along its own axis by relying on the engagement of its own external threads 131 with the internal thread surface 311 on the outer gear ring 31, thereby realizing the adjustment of the grinding gap of the bean grinding assembly 2.

[0034] Furthermore, as can be seen from the above, since the support member 14 is partially inserted into the receiving space 15 of the lifting rod 1 and can support each side wall 12 around the circumference of the connecting seat 11, when the grinding assembly 2 exerts a downward force on the lifting rod 1 due to the resistance during grinding, the support member 14 supports each side wall 12, preventing deformation of each side wall 12 towards the inside of the receiving space 15. Therefore, it can effectively prevent the internal thread 311 on the external gear ring 31 from slipping on the external thread 131 on each side wall 12, thereby ensuring the stability of the connection between the adjusting assembly 3 and the lifting rod 1 and improving the accuracy of the adjusting assembly 3 in adjusting the grinding degree of the grinding assembly 2. Furthermore, the support member 14 supports each side wall 12, which can also offset the pressure of the outer gear ring 31 on the transmission gear 33, making the rotation of the adjusting ring 32 easier. At the same time, during the rotation of the adjusting ring 32, it can also prevent the transmission gear 33 from skipping teeth with the outer gear ring 31 and / or the inner gear ring 34 respectively, thereby further ensuring the accuracy when adjusting the grinding degree of the bean grinding assembly 2.

[0035] Furthermore, when the adjusting component 3 drives the lifting rod 1 to move along its axial direction, in order to ensure the driving performance of the adjusting component 3 on the lifting rod 1, the supporting performance of the support member 14 on each side wall 12 of the lifting rod 1 can be further improved. In some embodiments, such as... Figure 1 and Figure 2As shown, each external thread 311 can be formed by extending from the end of each side wall 12 away from the connecting seat 11 toward the connecting seat 11, so that when the adjusting assembly 3 drives the lifting rod 1 to move linearly along its axis, the adjusting assembly 3 applies force from the top of the lifting rod 1 to each side wall 12. Since the support member 14 is detachably set at the end of each side wall 12 away from the connecting seat 11 and partially inserted into the receiving hole 15, the support member 14 at this time has the best support for the end of each side wall 12 away from the connecting seat 11, thereby further preventing the deformation of each side wall 12 when the grinding assembly 2 grinds beans.

[0036] Additionally, it is worth mentioning that, in order to facilitate a detachable connection between the support member 14 and the side walls 12 of the lifting rod 1, in some embodiments, such as Figure 3 As shown, the support member 14 is snap-fitted to each of the side walls 12. Furthermore, to achieve the snap-fit ​​connection between the support member 14 and each side wall 12, in some embodiments, such as... Figure 1 , Figure 2 and Figure 3 As shown, each sidewall 12 is provided with a locking hole 123, and corresponding to each locking hole 123, the support member 14 includes: a bushing 141, a plurality of buckles 142, and a support plate 143, wherein, as Figure 1 As shown, the bushing 141 is at least partially inserted into the receiving space 15, and is engaged with Figure 3 As shown, the bushing 141 includes: an outer side 1411 abutting against each sidewall 12, and an inner side 1412 opposite to the outer side 1411. Additionally, as... Figure 1 and Figure 3 As shown, the number of snap fasteners 142 is the same as the number of snap holes 123, and they correspond uniquely. Furthermore, each snap fastener 142 is also arranged around the outer side 1411 of the bushing 141 along its axial direction. Therefore, when the support member 14 is assembled with each side wall 12, as... Figure 3 As shown, each buckle 142 can be inserted into its corresponding buckle hole 123, allowing each buckle 142 to be engaged and fixed to each side wall 12. Finally, as... Figure 3 As shown, the support plate 143 is disposed inside the bushing 141, and the support plate 143 is also connected to the inner side 1412 of the bushing 141, so that the bushing 141 will not collapse inward under the support of the support plate 143, and can support each side wall 12 in its circumference, thereby effectively preventing each side wall 12 from deforming towards the interior of the accommodating space 15, and ensuring the accuracy when adjusting the grinding degree of the grinding assembly 2.

[0037] Furthermore, it is worth noting that in some embodiments, each buckle 142 can be integrally formed with the bushing 141, and simultaneously, as Figure 3As shown, each buckle 142 has a slope 1421 on the side opposite to the bushing 141. This slope 1421 extends gradually from the side closer to the bottom of the bushing 141 towards the outer side 1411 away from the bushing 141. It is easy to see that the slope 1421 of each buckle 142 facilitates the insertion of the bushing 141 into the receiving space 15 of the lifting rod 1, and guides the insertion of the bushing 141, so that the support member 14 can be easily engaged and fixed with each side wall 12.

[0038] Furthermore, in order to further improve the stability when the support member 14 is engaged with each side wall 12, in some embodiments, such as Figure 1 , Figure 2 and Figure 3 As shown, the support member 14 further includes a flange portion 144, which is formed by a portion of the outer side 1411 of the bushing 141 protruding away from the inner side 1412. Simultaneously, the flange portion 144 can abut against the end of the side wall 12 away from the connecting seat 11 along the axial direction of the bushing 141. It is thus evident that when the bushing 141 of the support member 14 is inserted into the receiving space 15 of the lifting rod 1, the snaps 142 and the flange portion 144 can jointly clamp the side walls 12 of the lifting rod 1 along the axial direction of the bushing 141, thereby further improving the assembly stability of the support member 14 and the lifting rod 1, and further improving the support performance of the bushing 141 for the side walls 12. Furthermore, in some embodiments, such as... Figure 1 and Figure 2 As shown, the flange portion 144 is an annular component formed around the axial direction of the bushing 141. Of course, in other embodiments, multiple flange portions 144 may be provided and arranged around the axial direction of the bushing 141.

[0039] However, as a preferred embodiment, in some other embodiments, the bushing 141 may also extend toward the connecting seat 11, so that each side wall 12 of the lifting rod 1 can be fitted with more area by the bushing 141 along its length, thereby further improving the support performance of the bushing 141 for each side wall 12.

[0040] Example 2

[0041] Embodiment 2 of this utility model relates to a grinding degree adjustment device, such as... Figure 4 As shown, the grinding degree adjustment device includes: a lifting rod 1 and an adjustment component 3 as described in Embodiment 1.

[0042] Among them, combined Figure 7 As shown, the connecting seat 11 of the lifting rod 1 is rotatably connected to the connecting shaft 21 of the grinding assembly 2, allowing the connecting shaft 21 to rotate relative to the lifting rod 1. Secondly, as... Figure 4As shown, the adjustment component 3 is connected to the transmission structure 13 of the lifting rod 1. The adjustment component 3 is used to drive the lifting rod 1 to move linearly along its axial direction through the transmission structure 13, so that the lifting rod 1 can adjust the grinding gap of the grinding component 2.

[0043] As can be seen from the above, since the support member 14 can support each side wall 12 around the circumference of the connecting seat 11, the downward force generated by the grinding assembly 2 on the lifting rod 1 when grinding beans will not cause the side walls 12 to deform toward the interior of the accommodating space 15. This improves the stability of the connection between the adjusting assembly 3 and the lifting rod 1 and ensures the accuracy of the adjusting assembly 3 when adjusting the grinding degree of the grinding assembly 2 through the lifting rod 1.

[0044] In addition, such as Figure 1 and Figure 2 As shown, since the transmission structure 13 mentioned in Embodiment 1 includes external threads 131 respectively disposed on the outer surface 122 of each sidewall 12, therefore, corresponding to the transmission structure 13, in some embodiments, such as Figure 4 As shown, the adjusting assembly 3 includes: an external gear ring 31, an adjusting ring 32, and a transmission gear 33. The external gear ring 31 can be fitted onto each side wall 12, and the external gear ring 31 is rotatable relative to the lifting rod 1. Furthermore, as... Figure 6 and Figure 7 As shown, the inner side of the external gear ring 31 is an internal thread surface 311 that engages with the external threads 131 of each sidewall 12, while the outer side of the external gear ring 31 is an external tooth profile surface 312. Finally, combined with Figure 5 As shown, the adjusting ring 32 is sleeved on the main housing 20 of the coffee grinder, and the adjusting ring 32 is also coaxially arranged with the outer gear ring 31. Furthermore, the adjusting ring 32 can rotate relative to the main housing 20. It is worth noting that, as... Figure 4 As shown, an internal gear ring 34 is also provided on the inner side of the adjusting ring 32 around its axis. Therefore, the transmission gear 33 can be positioned between the internal gear ring 34 and the outer tooth profile surface 312 of the outer gear ring 31, so that the transmission gear 33 can mesh with the internal gear ring 34 and the outer tooth profile surface 312 respectively. Thus, when it is necessary to adjust the grinding gap of the grinding assembly 2, combined with... Figure 4 It can be seen that the user can directly rotate the adjusting ring 32, and the transmission gear 33 can drive the outer gear ring 31 to rotate synchronously in the opposite direction to the adjustment ring 32 when the adjusting ring 32 is rotated, by using the meshing transmission relationship with the inner gear ring 34 and the outer gear surface 312 respectively. This allows the lifting rod 1 to change the rotation of the outer gear ring 31 into a linear motion along its own axis by relying on the engagement of its own external threads 131 with the internal thread surface 311 on the outer gear ring 31, thereby realizing the adjustment of the grinding gap of the bean grinding assembly 2.

[0045] Example 3

[0046] Embodiment 3 of this utility model relates to a coffee grinder, such as... Figure 5 , Figure 6 and Figure 7 As shown, the coffee grinder includes: a grind adjustment device as described in Embodiment 2, a grinding assembly 2, and a drive device 4. The grinding assembly 2, along the axial direction of the lifting rod 1, includes: an outer blade disc 22, an inner blade disc 23 opposite to the outer blade disc 22, and a connecting shaft 21 connected to either the outer blade disc 22 or the inner blade disc 23.

[0047] Secondly, such as Figure 6 and Figure 7 As shown, the drive device 4 is disposed in the accommodating space 15 and coaxially connected to the connecting shaft 21. At the same time, the drive device 4 is used to drive the outer blade 22 or the inner blade 23 to rotate through the connecting shaft 21, thereby realizing the grinding of coffee beans by the grinding assembly 2.

[0048] Furthermore, in order to enable the lifting rod 1 to drive the outer cutter head 22 or the inner cutter head 23 to move linearly along its axial direction via the connecting shaft 21, in some embodiments, such as Figure 7 As shown, the connecting shaft 21 can slide relative to the driving device 4 along its own axis. That is, the part of the connecting shaft 21 inserted into the driving device 4 is slidably connected to the driving device 4. Therefore, when the connecting shaft 21 is connected to the inner blade 22, the sliding connection between the connecting shaft 21 and the driving device 4 allows the connecting shaft 21 to drive the inner blade 23 to move relative to the outer blade 22 under the action of the lifting rod 1, thereby realizing the adjustment of the grinding gap between the inner blade 23 and the outer blade 22.

[0049] 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 lifting rod, capable of linear motion along its axial direction, for adjusting the grinding gap of the grinding assembly (2) of a coffee grinder, characterized in that, The lifting boom (1) includes: A connecting seat (11) is used for the rotatable connection between the lifting rod (1) and the grinding assembly (2), so that the grinding assembly (2) can rotate relative to the connecting seat (11); At least one sidewall (12) is arranged around the circumference of the connecting seat (11), and each of the sidewalls (12) forms an accommodating space (15) on the connecting seat (11), the accommodating space (15) being used to accommodate the drive device (4) of the coffee grinder; A transmission structure (13) is provided on each of the side walls (12) and connected to the adjustment component (3) of the coffee grinder. The transmission structure (13) is used to drive the lifting rod (1) to move linearly along its axial direction under the drive of the adjustment component (3). A support member (14) is inserted at least partially into the receiving space (15) and is detachably connected to at least one of the side walls (12); the support member (14) is used to circumferentially support each of the side walls (12) around the connecting seat (11).

2. The lifting boom according to claim 1, characterized in that, The sidewalls (12) are provided in multiple ways, such that when the support member (14) is inserted into the accommodating space (15), each sidewall (12) is opened in a direction away from the accommodating space (15).

3. The lifting boom according to claim 1, characterized in that, Each of the sidewalls (12) has an inner surface (121) relative to the accommodating space (15) and an outer surface (122) opposite to the inner surface (121); The transmission structure (13) includes external threads (131) respectively disposed on the outer surface (122) of each of the side walls (12).

4. The lifting boom (1) according to any one of claims 1-3, characterized in that, The support member (14) is snapped into connection with each of the side walls (12).

5. The lifting boom according to claim 4, characterized in that, Each of the sidewalls (12) is provided with a locking hole (123), and the support member (14) includes: A bushing (141) is inserted at least partially into the receiving space (15); the bushing (141) includes an outer side (1411) abutting against each of the sidewalls (12) and an inner side (1412) opposite to the outer side (1411); A number of buckles (142); the number of buckles (142) is the same as the number of holes (123) and they correspond uniquely. Each buckle (142) is wrapped around the outer side (1411) around the axis of the bushing (141), and each buckle (142) is inserted into the unique corresponding hole (123) and is fixedly engaged with each side wall (12). A support plate (143) is disposed inside the bushing (141) and connected to the inner side of the bushing (141) for supporting each of the sidewalls (12) circumferentially.

6. The lifting boom according to claim 5, characterized in that, The bushing (141) also extends toward the connecting seat (11).

7. The lifting boom according to claim 5, characterized in that, The support member (14) also includes: The flange (144) protrudes from the outer side of the bushing (141) in a direction away from the inner side and abuts against the side wall (12) away from the connecting seat (11) along the axial direction of the bushing (141).

8. A grinding degree adjustment device, characterized in that, include: The lifting rod (1) as described in any one of claims 1-7; wherein the connecting seat (11) of the lifting rod (1) is rotatably connected to the connecting shaft (21) of the grinding assembly (2), so that the connecting shaft (21) is rotatable relative to the lifting rod (1); The adjustment component (3) is connected to the transmission structure (13) of the lifting rod (1) and is used to drive the lifting rod (1) to move linearly along its axial direction through the transmission structure (13) so that the lifting rod (1) adjusts the grinding gap of the grinding component (2).

9. The grinding degree adjustment device according to claim 8, characterized in that, The transmission structure (13) includes: external threads (131) respectively disposed on the outer surface (122) of each of the side walls (12), and the adjustment assembly (3) includes: An external gear ring (31) is fitted onto each of the side walls (12) and is rotatable relative to the lifting rod (1); the inner side of the external gear ring (31) is an internal thread surface (311) that engages with the external thread (131) of each of the side walls (12), and the outer side of the external gear ring (31) is an external tooth profile surface (312). An adjusting ring (32) is fitted onto the main housing (20) of the coffee grinder and is coaxially arranged with the outer gear ring (31); the adjusting ring (32) is rotatable relative to the main housing (20), and an inner gear ring (34) is arranged on the inner side of the adjusting ring (32) around its axis. A transmission gear (33) is disposed between the internal gear ring (34) and the external tooth profile (312), and meshes with the internal gear ring (34) and the external tooth profile (312) respectively; wherein, the transmission gear (33) is used to drive the external gear ring (31) to rotate synchronously in the opposite direction of rotation to the adjustment ring (32) when the adjustment ring (32) rotates relative to the main housing (20), so that the lifting rod (1) moves linearly along its axial direction.

10. A coffee grinder, characterized in that, include: The grinding degree adjustment device as described in claim 8 or 9; Coffee grinder assembly (2); The grinding assembly (2) includes, along the axial direction of the lifting rod (1): an outer blade disc (22), an inner blade disc (23) opposite to the outer blade disc (22), and a connecting shaft (21) connected to the outer blade disc (22) or the inner blade disc (23); A drive device (4) is disposed in the accommodating space (15) and coaxially connected to the connecting shaft (21) for driving the outer cutter head (22) or the inner cutter head (23) to rotate through the connecting shaft (21); The connecting shaft (21) is also slidable relative to the driving device (4) along its own axis.

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