A nail grinder transmission assembly and a nail grinder

Abstract

The utility model relates to manicure polishing technical field, especially a kind of nail grinder transmission assembly and nail grinder.It is sequentially connected that nail grinder transmission assembly includes main shaft, coupling assembly and driving part;The two sides of main shaft are respectively provided with first journal portion and second journal portion, and nail grinder transmission assembly further includes first bearing and first sleeve that are sequentially outwardly fitted on first journal portion, and second bearing and second sleeve that are sequentially outwardly fitted on second journal portion, form two independently arranged support units, without satisfying higher coaxiality machining precision requirement, it is converted into the cooperation problem of two relatively short distance, independently machined and installed support units, it is convenient to adjust to improve the coaxiality precision of both ends bearing.First bearing and first sleeve, and second bearing and second sleeve, can each independent adjustment installation position, effectively suppress periodic mechanical vibration caused by coaxiality deviation, improve the stability and reliability under high-speed operation.

Description

Technical Field

[0001] This utility model relates to the field of nail polishing technology, and in particular to a nail polisher transmission component and a nail polisher. Background Technology

[0002] During the grinding process, the spindle in the transmission assembly of the armor grinder often operates at extremely high speeds, but this characteristic also places stringent requirements on the stability of the transmission structure. Traditional designs use a long sleeve as a bearing housing to fix the spindle. However, due to the large axial dimension of the long sleeve, the coaxiality accuracy of the bearing mounting positions at both ends is crucial. Even slight coaxiality deviations can cause non-uniform radial forces between the inner ring and journal of the bearing, and between the outer ring and the bearing housing, leading to periodic mechanical vibrations. Ensuring the coaxiality of the bearings at both ends to improve the operational stability of the armor grinder's transmission assembly has become a pressing technical problem that needs to be solved. Utility Model Content To solve the above problems, this utility model provides a nail grinding machine transmission assembly and a nail grinding machine.

[0003] The present invention provides a transmission assembly for a nail grinder, comprising a main shaft, a coupling assembly, and a drive component, wherein the main shaft, coupling assembly, and drive component are connected in sequence; a first journal and a second journal are respectively provided on both sides of the main shaft; the transmission assembly further comprises a first bearing, a first sleeve, a second bearing, and a second sleeve; the first bearing and the first sleeve are sequentially mounted on the first journal along the radial direction of the main shaft, and the second bearing and the second sleeve are sequentially mounted on the second journal along the radial direction of the main shaft.

[0004] Preferably, the portion of the spindle located between the first journal and the second journal is defined as the main body. The main body has a first shoulder at one end near the first journal and a second shoulder at one end near the second journal. The first sleeve has a first protrusion on the side away from the second sleeve, and the second sleeve has a second protrusion on the side away from the first sleeve. Both the first and second protrusions protrude toward the spindle. The first bearing is disposed between the first protrusion and the first shoulder, and the second bearing is disposed between the second protrusion and the second shoulder.

[0005] Preferably, the first bearing includes a first inner ring and a first outer ring coaxially arranged, the first inner ring abutting against the first shoulder, and the first outer ring abutting against the first protrusion; the second bearing includes a second inner ring and a second outer ring coaxially arranged, the second inner ring abutting against the second shoulder, and the second outer ring abutting against the second protrusion.

[0006] Preferably, the first sleeve is disposed on the side of the main shaft closer to the coupling assembly, and the second sleeve is disposed on the side of the main shaft away from the coupling assembly; the radial dimension of the first sleeve is greater than the radial dimension of the second sleeve.

[0007] Preferably, the main shaft has a mounting groove at the end away from the coupling assembly, a flexible sleeve is embedded in the mounting groove, the flexible sleeve has a mounting cavity, and the opening of the mounting cavity is located at the end of the flexible sleeve away from the coupling assembly.

[0008] Preferably, the first journal is disposed on the side of the main shaft near the coupling assembly, the main shaft further includes a connecting portion, the first journal and the connecting portion are arranged sequentially along the direction near the coupling assembly, and the connecting portion is connected to the coupling assembly.

[0009] Preferably, the coupling assembly includes a first coupling and a second coupling, the first coupling and the second coupling being arranged sequentially along the direction close to the connecting portion, and the first coupling, the second coupling and the main shaft rotating synchronously; the first coupling has at least one first circumferential limiting groove at one end close to the second coupling, and the side of the second coupling close to the first coupling is embedded in the first circumferential limiting groove; the second coupling has a second circumferential limiting groove at one end close to the connecting portion, and the connecting portion is at least partially embedded in the second circumferential limiting groove.

[0010] Preferably, the second coupling member has a first annular groove on the side extending into the first circumferential limiting groove, and the coupling assembly further includes a first elastic member, which is sleeved on the first annular groove.

[0011] Preferably, in the radial direction of the main shaft, there is a gap between the second coupling and the connecting part. The coupling assembly further includes a second elastic element, which is disposed at the gap. The two ends of the second elastic element are respectively connected to the main shaft and the second coupling, and the second elastic element is sleeved on the connecting part.

[0012] To solve the above-mentioned technical problems, this utility model provides another technical solution as follows: a nail grinder, the nail grinder including a housing and the above-mentioned nail grinder transmission assembly, the nail grinder transmission assembly being disposed inside the housing.

[0013] Compared with the prior art, the nail grinding device transmission assembly and nail grinding device provided by this utility model have the following beneficial effects: 1. This utility model provides a transmission assembly for a nail grinder. The transmission assembly includes a main shaft, a coupling assembly, and a drive component, which are connected sequentially. A first journal and a second journal are respectively provided on both sides of the main shaft. The transmission assembly also includes a first bearing, a first sleeve, a second bearing, and a second sleeve. The first bearing and the first sleeve are sequentially mounted radially outwards on the first journal, and the second bearing and the second sleeve are sequentially mounted radially outwards on the second journal. By independently setting support units composed of the first bearing and the first sleeve, and the second bearing and the second sleeve on the first and second journals respectively, instead of using a traditional integral long sleeve bearing seat structure, the high coaxiality machining accuracy requirement of the long sleeve bearing seat is eliminated. Instead, it is transformed into a problem of matching two relatively short-distance, independently machined and installable support units, facilitating adjustment to improve the coaxiality accuracy of the bearings at both ends. The first bearing and the first sleeve, as well as the second bearing and the second sleeve, can be independently adjusted in their installation positions relative to the first journal and the second journal. This avoids the problem of difficulty in ensuring the coaxiality of the bearing positions at both ends due to the large axial dimension during the machining of long sleeves, effectively suppressing periodic mechanical vibration caused by coaxiality deviation, and improving the stability and reliability of the armor grinder transmission assembly under high-speed operation.

[0014] 2. In this embodiment of the present invention, the portion of the main shaft located between the first journal and the second journal is the main body. The main body has a first shoulder at one end near the first journal and a second shoulder at one end near the second journal. A first protrusion is provided on the side of the first sleeve away from the second sleeve, and a second protrusion is provided on the side of the second sleeve away from the first sleeve. Both the first and second protrusions protrude towards the main shaft. The first bearing is disposed between the first protrusion and the first shoulder, and the second bearing is disposed between the second protrusion and the second shoulder. This achieves precise axial positioning of the first and second bearings, preventing axial movement during high-speed operation, ensuring that the first and second bearings are always in the set assembly position, and enhancing the stability of the armor grinder transmission assembly.

[0015] 3. The first bearing provided in this embodiment of the present invention includes a first inner ring and a first outer ring arranged coaxially. The first inner ring abuts against a first shoulder, and the first outer ring abuts against a first protrusion. The second bearing includes a second inner ring and a second outer ring arranged coaxially. The second inner ring abuts against a second shoulder, and the second outer ring abuts against a second protrusion. This allows the first bearing to be positioned by the first shoulder and the first protrusion, and the second bearing to be positioned by the second shoulder and the second protrusion. This forms a precise constraint on the corresponding inner and outer rings of the first and second bearings, ensuring the coaxiality of the first and second bearings with their corresponding journals and sleeves. This reduces uneven radial force caused by bearing positioning deviation, thereby reducing the vibration and wear of the first and second bearings and extending the service life of the armor grinder transmission assembly.

[0016] 4. In this embodiment of the invention, the first sleeve is located on the side of the main shaft closer to the coupling assembly, and the second sleeve is located on the side of the main shaft farther from the coupling assembly; the radial dimension of the first sleeve is larger than that of the second sleeve. Since the main shaft, coupling assembly, and drive component are connected sequentially, and the first sleeve is located on the side of the main shaft closer to the coupling assembly, the first sleeve is more centrally positioned than the second sleeve. The larger radial dimension of the first sleeve allows it to have a thicker wall, significantly improving structural rigidity. The first sleeve is located near the power input end of the coupling assembly, which is the core area for torque transmission and is prone to radial deformation or swaying due to power impact. The larger radial dimension of the first sleeve effectively resists radial deformation, preventing the bearing outer ring from shifting due to deformation of the first sleeve itself, thereby confining the first bearing to a specific rotation axis and preventing a decrease in the coaxiality of the first bearing due to deformation of the first sleeve. Furthermore, the larger radial dimension of the more centrally positioned first sleeve facilitates the formation of a structure frame that is wider in the middle and narrower at the ends of the armor grinder, making it easier for the user to grip.

[0017] 5. In this embodiment of the invention, the spindle has a mounting groove at the end furthest from the coupling assembly. A flexible sleeve is embedded in the mounting groove, and the flexible sleeve has a mounting cavity. The opening of the mounting cavity is located at the end of the flexible sleeve furthest from the coupling assembly. By creating a mounting groove with a flexible sleeve at the end of the spindle furthest from the coupling assembly, vibration damping and buffering are provided for the connection of the grinding head. The elastic deformation capability of the flexible sleeve can absorb the vibration generated by the high-speed rotation of the spindle, preventing it from being directly transmitted to the grinding head, thereby improving the smoothness of the grinding operation and enhancing the user experience.

[0018] 6. In this embodiment of the invention, the first journal is disposed on the side of the main shaft near the coupling assembly. The main shaft also includes a connecting portion. The first journal and the connecting portion are arranged sequentially along the direction near the coupling assembly, and the connecting portion is connected to the coupling assembly. By setting the connecting portion and arranging the first journal and the connecting portion sequentially along the direction near the coupling assembly, the connecting portion is used to connect and match the coupling assembly, while the first journal is used for positioning and supporting the first bearing, thereby achieving functional partitioning and facilitating independent processing and precision control of each part.

[0019] 7. The coupling assembly provided in this embodiment of the present invention includes a first coupling and a second coupling, which are arranged sequentially along the direction close to the connecting part. The first coupling, the second coupling, and the main shaft rotate synchronously. At least one first circumferential limiting groove is provided at one end of the first coupling near the second coupling, and the side of the second coupling near the first coupling is embedded in the first circumferential limiting groove. A second circumferential limiting groove is provided at one end of the second coupling near the connecting part, and the connecting part is at least partially embedded in the second circumferential limiting groove. Since the coupling assembly includes a first coupling and a second coupling, and the second coupling is embedded in the first circumferential limiting groove on the side close to the first coupling, and the connecting part is at least partially embedded in the second circumferential limiting groove, a hierarchical nested fit is formed, achieving precise circumferential fixation of the three components, avoiding relative rotation during transmission, and significantly improving transmission synchronization and reliability. In addition, the separate design of the first and second couplings facilitates the disassembly and replacement of individual couplings without the need to replace the entire coupling assembly, reducing maintenance costs and simplifying the docking process between the coupling assembly and the spindle during assembly.

[0020] 8. In this embodiment of the present invention, the second coupling member extending into the first circumferential limiting groove has a first annular groove on its side. The coupling assembly also includes a first elastic member, which is sleeved on the first annular groove. The first elastic member is sleeved in the first annular groove of the second coupling member, forming an elastic buffer area in the radial direction where the second coupling member and the first coupling member mate, thus avoiding transmission impact and abnormal noise caused by loose fit. The first elastic member can also compensate for the radial gap between the first coupling member and the second coupling member caused by assembly errors, further suppressing vibration and noise, making the transmission process smoother and more comfortable, and extending the durability of the coupling assembly.

[0021] 9. In this embodiment of the invention, a gap is left between the second coupling and the connecting part in the radial direction of the main shaft. The coupling assembly also includes a second elastic element, which is disposed at the gap. The two ends of the second elastic element are respectively connected to the main shaft and the second coupling, and the second elastic element is sleeved on the connecting part. Because there is a gap between the second coupling and the connecting part, and the second elastic element is disposed at the gap and sleeved on the connecting part, an axial buffer area is formed. The second elastic element can effectively absorb the axial vibration generated by the rotation of the main shaft, preventing the vibration from being transmitted to other components through the main shaft and the second coupling, thus achieving vibration isolation. This further improves the smoothness and comfort of the grinding process and reduces operating noise. Furthermore, the deformation capability of the second elastic element enhances the adaptability of the main shaft and the second coupling, ensuring that the main shaft and the second coupling can maintain stable synchronous rotation under different working conditions.

[0022] 10. The nail grinder provided in this embodiment of the present invention includes a housing and the aforementioned nail grinder transmission assembly, the transmission assembly being disposed within the housing. The nail grinder achieves the same beneficial effects as the nail grinder transmission assembly, which will not be described in detail here. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a three-dimensional structural schematic diagram of the armor grinder transmission assembly provided in the first embodiment of this utility model.

[0025] Figure 2 This is a cross-sectional structural diagram of the armor grinder transmission assembly provided in the first embodiment of this utility model.

[0026] Figure 3 This is an exploded structural diagram of the armor grinding machine transmission assembly provided in the first embodiment of this utility model.

[0027] Figure 4 yes Figure 2 Enlarged view of the structure of part A in the middle.

[0028] Figure 5 This is a structural block diagram of the nail grinder provided in the second embodiment of this utility model.

[0029] Explanation of reference numerals in the attached diagram: 1. Armor grinder transmission assembly; 10. Main shaft; 11. First journal; 12. Second journal; 13. First bearing; 14. First sleeve; 15. Second bearing; 16. Second sleeve; 17. Main body; 18. Mounting groove; 19. Connecting part; 20. Coupling assembly; 21. First coupling; 22. Second coupling; 23. First elastic element; 24. Clearance; 25. Second elastic element; 30. Drive element; 131. First inner ring; 132. First outer ring; 141. First protrusion; 151. Second inner ring; 152. Second outer ring; 161. Second protrusion; 171. First shoulder; 172. Second shoulder; 181. Flexible sleeve; 211. First circumferential limiting groove; 221. Second circumferential limiting groove; 222. First annular groove; 1811. Mounting cavity; 100. Armor grinder; 101. Housing. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0031] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0032] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0033] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0034] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0035] Please combine Figures 1 to 4 The first embodiment of this utility model provides a nail grinding device transmission assembly 1, which includes a main shaft 10, a coupling assembly 20, and a drive component 30. The main shaft 10, the coupling assembly 20, and the drive component 30 are connected in sequence. A first journal 11 and a second journal 12 are respectively provided on both sides of the main shaft 10. The nail grinding device transmission assembly 1 also includes a first bearing 13, a first sleeve 14, a second bearing 15, and a second sleeve 16. The first bearing 13 and the first sleeve 14 are sequentially mounted on the first journal 11 along the radial direction of the main shaft 10, and the second bearing 15 and the second sleeve 16 are sequentially mounted on the second journal 12 along the radial direction of the main shaft 10.

[0036] Understandably, by independently setting support units consisting of a first bearing 13 and a first sleeve 14, a second bearing 15, and a second sleeve 16 on the first journal 11 and the second journal 12, instead of using a traditional integral long sleeve bearing housing structure, the requirement for high coaxiality machining accuracy of the long sleeve bearing housing is eliminated. Instead, it is transformed into a problem of matching two relatively short-distance, independently machined and installable support units, which facilitates adjustment to improve the coaxiality accuracy of the bearings at both ends. The first bearing 13 and the first sleeve 14, as well as the second bearing 15 and the second sleeve 16, can each be independently adjusted in their installation position with the first journal 11 and the second journal 12. This avoids the problem of difficulty in ensuring the coaxiality of the bearing positions at both ends due to the large axial dimension during the machining of the long sleeve, effectively suppressing periodic mechanical vibration caused by coaxiality deviation, and improving the stability and reliability of the armor grinder transmission assembly 1 under high-speed operation.

[0037] Please combine Figures 2 to 4Furthermore, the portion of the spindle 10 located between the first journal 11 and the second journal 12 is defined as the main body 17. The main body 17 has a first shoulder 171 at the end near the first journal 11 and a second shoulder 172 at the end near the second journal 12. The first sleeve 14 has a first protrusion 141 on the side away from the second sleeve 16, and the second sleeve 16 has a second protrusion 161 on the side away from the first sleeve 14. Both the first protrusion 141 and the second protrusion 161 protrude toward the spindle 10. The first bearing 13 is disposed between the first protrusion 141 and the first shoulder 171, and the second bearing 15 is disposed between the second protrusion 161 and the second shoulder 172.

[0038] Understandably, since the first bearing 13 is located between the first protrusion 141 and the first shoulder 171, and the second bearing 15 is located between the second protrusion 161 and the second shoulder 172, the first bearing 13 and the second bearing 15 are precisely axially positioned, preventing axial movement during high-speed operation and ensuring that the first bearing 13 and the second bearing 15 are always in the set assembly position, thereby enhancing the stability of the armor grinder transmission assembly 1.

[0039] Please combine Figure 3 and Figure 4 Furthermore, the first bearing 13 includes a first inner ring 131 and a first outer ring 132 coaxially arranged, the first inner ring 131 abutting against the first shoulder 171, and the first outer ring 132 abutting against the first protrusion 141; the second bearing 15 includes a second inner ring 151 and a second outer ring 152 coaxially arranged, the second inner ring 151 abutting against the second shoulder 172, and the second outer ring 152 abutting against the second protrusion 161.

[0040] Understandably, the above configuration enables the first bearing 13 to be positioned via the first shoulder 171 and the first protrusion 141, and the second bearing 15 to be positioned via the second shoulder 172 and the second protrusion 161. This forms a precise constraint on the inner and outer rings of the first bearing 13 and the second bearing 15, ensuring the coaxiality of the first bearing 13 and the second bearing 15 with the corresponding journal and sleeve. This reduces uneven radial force caused by bearing positioning deviation, thereby reducing the vibration and wear of the first bearing 13 and the second bearing 15, and extending the service life of the armor grinder transmission assembly 1.

[0041] Please continue to combine Figure 3 and Figure 4 Furthermore, the first sleeve 14 is disposed on the side of the main shaft 10 close to the coupling assembly 20, and the second sleeve 16 is disposed on the side of the main shaft 10 away from the coupling assembly 20; the radial dimension of the first sleeve 14 is greater than the radial dimension of the second sleeve 16.

[0042] Understandably, if the radial dimension of the first sleeve 14 is defined as R and the radial dimension of the second sleeve 16 as r, then R is greater than r. Since the main shaft 10, coupling assembly 20, and drive component 30 are connected sequentially, and the first sleeve 14 is positioned on the side of the main shaft 10 closest to the coupling assembly 20, the first sleeve 14 is more centrally located than the second sleeve 16. The larger radial dimension of the first sleeve 14 allows it to have a thicker wall, significantly improving structural rigidity. The first sleeve 14 is located near the power input end of the coupling assembly 20, which is the core area for torque transmission and prone to radial deformation or wobbling due to power impact. The larger radial dimension of the first sleeve 14 effectively resists radial deformation, preventing the bearing outer ring from shifting due to deformation of the first sleeve 14 itself. This confines the first bearing 13 to a specific rotation axis, preventing a decrease in the coaxiality of the first bearing 13 due to deformation of the first sleeve 14. Simultaneously, the larger radial dimension of the more centrally located first sleeve 14 facilitates the formation of a structure frame that is wider in the middle and narrower at the ends of the armor grinder, making it easier for the user to grip.

[0043] Please combine Figure 2 and Figure 3 Furthermore, the main shaft 10 has a mounting groove 18 at the end away from the coupling assembly 20. A flexible sleeve 181 is embedded in the mounting groove 18. The flexible sleeve 181 has a mounting cavity 1811. The opening of the mounting cavity 1811 is located at the end of the flexible sleeve 181 away from the coupling assembly 20.

[0044] Understandably, by creating a mounting groove 18 with a flexible sleeve 181 embedded at the end of the spindle 10 away from the coupling assembly 20, vibration damping and buffering are provided for the connection of the grinding head. The elastic deformation capability of the flexible sleeve 181 can absorb the vibration generated by the high-speed rotation of the spindle 10, preventing it from being directly transmitted to the grinding head, thereby improving the smoothness of the grinding operation and enhancing the user experience.

[0045] Optionally, the flexible sleeve 181 can be made of materials such as TPU (thermoplastic polyurethane elastomer) or rubber.

[0046] Please combine Figure 2 and Figure 4 Furthermore, the first journal 11 is disposed on the side of the main shaft 10 near the coupling assembly 20, and the main shaft 10 also includes a connecting portion 19. The first journal 11 and the connecting portion 19 are arranged sequentially along the direction near the coupling assembly 20, and the connecting portion 19 is connected to the coupling assembly 20.

[0047] Understandably, by setting the connecting part 19 and arranging the first journal 11 and the connecting part 19 sequentially along the direction close to the coupling assembly 20, the connecting part 19 is used to connect and match the coupling assembly 20, and the first journal 11 is used for positioning and supporting the first bearing 13, thereby realizing functional partitioning and facilitating independent processing and precision control of each part.

[0048] Please continue to combine Figure 2 and Figure 3 Furthermore, the coupling assembly 20 includes a first coupling 21 and a second coupling 22, which are arranged sequentially along the direction close to the connecting portion 19. The first coupling 21, the second coupling 22 and the main shaft 10 rotate synchronously. At least one first circumferential limiting groove 211 is provided at one end of the first coupling 21 near the second coupling 22, and the side of the second coupling 22 near the first coupling 21 is embedded in the first circumferential limiting groove 211. A second circumferential limiting groove 221 is provided at one end of the second coupling 22 near the connecting portion 19, and the connecting portion 19 is at least partially embedded in the second circumferential limiting groove 221.

[0049] Understandably, since the coupling assembly 20 includes a first coupling 21 and a second coupling 22, and the second coupling 22 is embedded in the first circumferential limiting groove 211 on the side closer to the first coupling 21, and the connecting part 19 is at least partially embedded in the second circumferential limiting groove 221, a hierarchical nested fit is formed, which can achieve precise circumferential fixation of the three components, avoid relative rotation during transmission, and significantly improve transmission synchronization and reliability. In addition, the separate design of the first coupling 21 and the second coupling 22 facilitates the disassembly and replacement of individual coupling components without the need to replace the entire coupling assembly 20, reducing maintenance costs, and simplifying the docking process between the coupling assembly 20 and the main shaft 10 during assembly.

[0050] Optionally, the first coupling 21 has a first circumferential limiting groove 211 with a cross-shaped groove at one end near the second coupling 22, and the cross-sectional area of ​​the side of the second coupling 22 near the first coupling 21 is a corresponding cross shape.

[0051] Optionally, the second coupling 22 has a second circumferential limiting groove 221 with a cross-shaped notch at one end near the connecting part 19, and the cross-sectional area of ​​the connecting part 19 is the corresponding cross shape.

[0052] Please continue to combine Figure 2 and Figure 3 Furthermore, the second coupling member 22 extends into the side of the first circumferential limiting groove 211 and has a first annular groove 222. The coupling assembly 20 also includes a first elastic member 23, which is sleeved on the first annular groove 222.

[0053] Understandably, a first elastic element 23 is fitted inside the first annular groove 222 of the second coupling 22, forming an elastic buffer area in the radial direction where the second coupling 22 and the first coupling 21 mate, thus avoiding transmission shock and abnormal noise caused by loose fit. The first elastic element 23 can also compensate for the radial gap 24 between the first coupling 21 and the second coupling 22 caused by assembly errors, further suppressing vibration and noise, making the transmission process smoother and more comfortable, and extending the durability of the coupling assembly 20.

[0054] Optionally, the first elastic element 23 may be made of materials such as TPU (thermoplastic polyurethane elastomer) or rubber.

[0055] Please continue to combine Figure 2 and Figure 3 Furthermore, in the radial direction of the main shaft 10, a gap 24 is left between the second coupling 22 and the connecting part 19. The coupling assembly 20 also includes a second elastic element 25, which is disposed at the gap 24. The two ends of the second elastic element 25 are respectively connected to the main shaft 10 and the second coupling 22, and the second elastic element 25 is sleeved on the connecting part 19.

[0056] Understandably, since there is a gap 24 between the second coupling 22 and the connecting part 19, the second elastic element 25 is disposed at the gap 24 and sleeved on the connecting part 19, thereby forming an axial buffer area. The second elastic element 25 can effectively absorb the axial vibration generated by the rotation of the main shaft 10, preventing the vibration from being transmitted to other components through the main shaft 10 and the second coupling 22, thus achieving vibration isolation. This further improves the smoothness and comfort of the grinding process, while also reducing operating noise. In addition, the deformation capability of the second elastic element 25 can enhance the adaptability of the main shaft 10 and the second coupling 22, ensuring that the main shaft 10 and the second coupling 22 can still maintain stable synchronous rotation under different working conditions.

[0057] Optionally, the second elastic element 25 is a spring.

[0058] Please see Figure 5 The second embodiment of this utility model provides a nail grinder 100, which includes a housing 101 and a nail grinder transmission assembly 1 of the first embodiment of this utility model. The nail grinder transmission assembly 1 is disposed inside the housing 101.

[0059] Understandably, the nail grinder 100 can achieve the same beneficial effects as the nail grinder transmission assembly 1 of the first embodiment of this utility model, and will not be described again here.

[0060] Compared with the prior art, the nail grinding device transmission assembly and nail grinding device of this utility model have the following advantages: 1. This utility model provides a transmission assembly for a nail grinder. The transmission assembly includes a main shaft, a coupling assembly, and a drive component, which are connected sequentially. A first journal and a second journal are respectively provided on both sides of the main shaft. The transmission assembly also includes a first bearing, a first sleeve, a second bearing, and a second sleeve. The first bearing and the first sleeve are sequentially mounted radially outwards on the first journal, and the second bearing and the second sleeve are sequentially mounted radially outwards on the second journal. By independently setting support units composed of the first bearing and the first sleeve, and the second bearing and the second sleeve on the first and second journals respectively, instead of using a traditional integral long sleeve bearing seat structure, the high coaxiality machining accuracy requirement of the long sleeve bearing seat is eliminated. Instead, it is transformed into a problem of matching two relatively short-distance, independently machined and installable support units, facilitating adjustment to improve the coaxiality accuracy of the bearings at both ends. The first bearing and the first sleeve, as well as the second bearing and the second sleeve, can be independently adjusted in their installation positions relative to the first journal and the second journal. This avoids the problem of difficulty in ensuring the coaxiality of the bearing positions at both ends due to the large axial dimension during the machining of long sleeves, effectively suppressing periodic mechanical vibration caused by coaxiality deviation, and improving the stability and reliability of the armor grinder transmission assembly under high-speed operation.

[0061] 2. In this embodiment of the present invention, the portion of the main shaft located between the first journal and the second journal is the main body. The main body has a first shoulder at one end near the first journal and a second shoulder at one end near the second journal. A first protrusion is provided on the side of the first sleeve away from the second sleeve, and a second protrusion is provided on the side of the second sleeve away from the first sleeve. Both the first and second protrusions protrude towards the main shaft. The first bearing is disposed between the first protrusion and the first shoulder, and the second bearing is disposed between the second protrusion and the second shoulder. This achieves precise axial positioning of the first and second bearings, preventing axial movement during high-speed operation, ensuring that the first and second bearings are always in the set assembly position, and enhancing the stability of the armor grinder transmission assembly.

[0062] 3. The first bearing provided in this embodiment of the present invention includes a first inner ring and a first outer ring arranged coaxially. The first inner ring abuts against a first shoulder, and the first outer ring abuts against a first protrusion. The second bearing includes a second inner ring and a second outer ring arranged coaxially. The second inner ring abuts against a second shoulder, and the second outer ring abuts against a second protrusion. This allows the first bearing to be positioned by the first shoulder and the first protrusion, and the second bearing to be positioned by the second shoulder and the second protrusion. This forms a precise constraint on the corresponding inner and outer rings of the first and second bearings, ensuring the coaxiality of the first and second bearings with their corresponding journals and sleeves. This reduces uneven radial force caused by bearing positioning deviation, thereby reducing the vibration and wear of the first and second bearings and extending the service life of the armor grinder transmission assembly.

[0063] 4. In this embodiment of the present invention, the first sleeve is disposed on the side of the main shaft near the coupling assembly, and the second sleeve is disposed on the side of the main shaft away from the coupling assembly; the radial dimension of the first sleeve is greater than that of the second sleeve. Since the main shaft, coupling assembly, and drive component are connected in sequence, and the first sleeve is disposed on the side of the main shaft near the coupling assembly, the first sleeve is more centrally located than the second sleeve. The larger radial dimension of the first sleeve allows it to have a thicker wall, significantly improving structural rigidity. The first sleeve is located near the power input end of the coupling assembly, which is the core area for torque transmission and is prone to radial deformation or swaying due to power impact. The larger radial dimension of the first sleeve can effectively resist radial deformation, preventing the bearing outer ring from shifting due to deformation of the first sleeve itself, thereby restricting the first bearing to a specific rotation axis and preventing a decrease in the coaxiality of the first bearing due to deformation of the first sleeve.

[0064] 5. In this embodiment of the invention, the spindle has a mounting groove at the end furthest from the coupling assembly. A flexible sleeve is embedded in the mounting groove, and the flexible sleeve has a mounting cavity. The opening of the mounting cavity is located at the end of the flexible sleeve furthest from the coupling assembly. By creating a mounting groove with a flexible sleeve at the end of the spindle furthest from the coupling assembly, vibration damping and buffering are provided for the connection of the grinding head. The elastic deformation capability of the flexible sleeve can absorb the vibration generated by the high-speed rotation of the spindle, preventing it from being directly transmitted to the grinding head, thereby improving the smoothness of the grinding operation and enhancing the user experience.

[0065] 6. In this embodiment of the invention, the first journal is disposed on the side of the main shaft near the coupling assembly. The main shaft also includes a connecting portion. The first journal and the connecting portion are arranged sequentially along the direction near the coupling assembly, and the connecting portion is connected to the coupling assembly. By setting the connecting portion and arranging the first journal and the connecting portion sequentially along the direction near the coupling assembly, the connecting portion is used to connect and match the coupling assembly, while the first journal is used for positioning and supporting the first bearing, thereby achieving functional partitioning and facilitating independent processing and precision control of each part.

[0066] 7. The coupling assembly provided in this embodiment of the present invention includes a first coupling and a second coupling, which are arranged sequentially along the direction close to the connecting part. The first coupling, the second coupling, and the main shaft rotate synchronously. At least one first circumferential limiting groove is provided at one end of the first coupling near the second coupling, and the side of the second coupling near the first coupling is embedded in the first circumferential limiting groove. A second circumferential limiting groove is provided at one end of the second coupling near the connecting part, and the connecting part is at least partially embedded in the second circumferential limiting groove. Since the coupling assembly includes a first coupling and a second coupling, and the second coupling is embedded in the first circumferential limiting groove on the side close to the first coupling, and the connecting part is at least partially embedded in the second circumferential limiting groove, a hierarchical nested fit is formed, achieving precise circumferential fixation of the three components, avoiding relative rotation during transmission, and significantly improving transmission synchronization and reliability. In addition, the separate design of the first and second couplings facilitates the disassembly and replacement of individual couplings without the need to replace the entire coupling assembly, reducing maintenance costs and simplifying the docking process between the coupling assembly and the spindle during assembly.

[0067] 8. In this embodiment of the present invention, the second coupling member extending into the first circumferential limiting groove has a first annular groove on its side. The coupling assembly also includes a first elastic member, which is sleeved on the first annular groove. The first elastic member is sleeved in the first annular groove of the second coupling member, forming an elastic buffer area in the radial direction where the second coupling member and the first coupling member mate, thus avoiding transmission impact and abnormal noise caused by loose fit. The first elastic member can also compensate for the radial gap between the first coupling member and the second coupling member caused by assembly errors, further suppressing vibration and noise, making the transmission process smoother and more comfortable, and extending the durability of the coupling assembly.

[0068] 9. In this embodiment of the invention, a gap is left between the second coupling and the connecting part in the radial direction of the main shaft. The coupling assembly also includes a second elastic element, which is disposed at the gap. The two ends of the second elastic element are respectively connected to the main shaft and the second coupling, and the second elastic element is sleeved on the connecting part. Because there is a gap between the second coupling and the connecting part, and the second elastic element is disposed at the gap and sleeved on the connecting part, an axial buffer area is formed. The second elastic element can effectively absorb the axial vibration generated by the rotation of the main shaft, preventing the vibration from being transmitted to other components through the main shaft and the second coupling, thus achieving vibration isolation. This further improves the smoothness and comfort of the grinding process and reduces operating noise. Furthermore, the deformation capability of the second elastic element enhances the adaptability of the main shaft and the second coupling, ensuring that the main shaft and the second coupling can maintain stable synchronous rotation under different working conditions.

[0069] 10. The nail grinder provided in this embodiment of the present invention includes a housing and the aforementioned nail grinder transmission assembly, the transmission assembly being disposed within the housing. The nail grinder achieves the same beneficial effects as the nail grinder transmission assembly, which will not be described in detail here.

[0070] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A transmission assembly for an armor grinder, characterized in that: The armor grinder transmission assembly includes a main shaft, a coupling assembly, and a drive component, which are connected in sequence. A first journal and a second journal are respectively provided on both sides of the main shaft. The armor grinder transmission assembly also includes a first bearing, a first sleeve, a second bearing, and a second sleeve. The first bearing and the first sleeve are sequentially mounted on the first journal along the radial direction of the main shaft, and the second bearing and the second sleeve are sequentially mounted on the second journal along the radial direction of the main shaft.

2. The armor grinder transmission assembly as described in claim 1, characterized in that: The portion of the spindle located between the first journal and the second journal is defined as the main body. The main body has a first shoulder at one end near the first journal and a second shoulder at one end near the second journal. The first sleeve has a first protrusion on the side away from the second sleeve, and the second sleeve has a second protrusion on the side away from the first sleeve. Both the first and second protrusions protrude toward the spindle. The first bearing is disposed between the first protrusion and the first shoulder, and the second bearing is disposed between the second protrusion and the second shoulder.

3. The armor grinder transmission assembly as described in claim 2, characterized in that: The first bearing includes a first inner ring and a first outer ring coaxially arranged, the first inner ring abutting against the first shoulder, and the first outer ring abutting against the first protrusion; the second bearing includes a second inner ring and a second outer ring coaxially arranged, the second inner ring abutting against the second shoulder, and the second outer ring abutting against the second protrusion.

4. The armor grinder transmission assembly as described in claim 1, characterized in that: The first sleeve is disposed on the side of the main shaft closer to the coupling assembly, and the second sleeve is disposed on the side of the main shaft away from the coupling assembly; the radial dimension of the first sleeve is greater than the radial dimension of the second sleeve.

5. The armor grinder transmission assembly as described in claim 1, characterized in that: The main shaft has a mounting groove at the end away from the coupling assembly. A flexible sleeve is embedded in the mounting groove. The flexible sleeve has a mounting cavity, and the opening of the mounting cavity is located at the end of the flexible sleeve away from the coupling assembly.

6. The armor grinder transmission assembly as described in claim 1, characterized in that: The first journal is disposed on the side of the main shaft near the coupling assembly. The main shaft also includes a connecting portion. The first journal and the connecting portion are arranged sequentially along the direction near the coupling assembly. The connecting portion is connected to the coupling assembly.

7. The armor grinder transmission assembly as described in claim 6, characterized in that: The coupling assembly includes a first coupling and a second coupling, which are arranged sequentially along the direction close to the connecting portion. The first coupling, the second coupling, and the main shaft rotate synchronously. At least one first circumferential limiting groove is provided at one end of the first coupling near the second coupling, and the side of the second coupling near the first coupling is embedded in the first circumferential limiting groove. A second circumferential limiting groove is provided at one end of the second coupling near the connecting portion, and the connecting portion is at least partially embedded in the second circumferential limiting groove.

8. The armor grinder transmission assembly as described in claim 7, characterized in that: The second coupling member extends into the side of the first circumferential limiting groove and has a first annular groove. The coupling assembly also includes a first elastic member, which is sleeved on the first annular groove.

9. The armor grinder transmission assembly as described in claim 7, characterized in that: In the radial direction of the main shaft, there is a gap between the second coupling and the connecting part. The coupling assembly also includes a second elastic element, which is disposed in the gap. The two ends of the second elastic element are respectively connected to the main shaft and the second coupling, and the second elastic element is sleeved on the connecting part.

10. A nail grinder, characterized in that: The armor grinder includes a housing and an armor grinder transmission assembly as described in any one of claims 1 to 9, the armor grinder transmission assembly being disposed within the housing.

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