A sharpening wheel shaft assembly

Abstract

The utility model relates to a kind of grinding wheel shaft assembly of knife grinder, including axle core and lock block, the both ends of axle core are respectively equipped with the fixed part and drive part with lock block and external driving part cooperation, fixed part one end is equipped with transmission block, transmission block and lock block one end are respectively equipped with extrusion block and guide block, extrusion block and guide block between are equipped with inner support sleeve, lock block outside is equipped with the fixed block that can slide, lock block is connected with fixed part and fixed block connection cooperation by thread connection.The utility model cooperates with fixed part by lock block, so that extrusion block moves to guide block, promote inner support sleeve to expand outward, and closely adhere to the inner hole of grinding wheel, realize the radial fixation of grinding wheel, ensure the coaxial degree of grinding wheel and axle core, effectively reduce the vibration and bounce when high speed rotation, improve grinding accuracy and security.And through the thread cooperation of lock block and fixed block, the axial fixation of grinding wheel is realized, avoid grinding wheel axial movement, ensure the stability of grinding wheel under high speed operation.

Description

Technical Field

[0001] This utility model relates to the field of drive shaft technology, specifically to a grinding wheel shaft assembly. Background Technology

[0002] Grinding wheels, as abrasive tools, use abrasive particles on their surface to grind workpieces and are widely used in machining, tool sharpening, and other fields. The grinding wheel spindle assembly is a key component used to fix and drive the grinding wheel to achieve the grinding function. Existing grinding wheel spindle assemblies achieve the installation and fixation of the grinding wheel through the cooperation of a locking block and a spindle core.

[0003] However, due to dimensional errors in the grinding wheel mounting hole during production, and the inability to adjust the diameter of the shaft core to accommodate variations in the grinding wheel mounting hole's tolerance, shaft misalignment easily occurs between the grinding wheel and the shaft core during assembly. This leads to vibration or runout of the grinding wheel during high-speed rotation, affecting grinding accuracy and potentially causing safety accidents. Therefore, this invention proposes a grinding wheel shaft assembly that can effectively compensate for dimensional errors in the grinding wheel mounting hole. Summary of the Invention

[0004] This utility model provides a grinding wheel shaft assembly, which solves the coaxiality deviation problem caused by the size error of the grinding wheel mounting hole by the cooperation of the inner support sleeve with the extrusion block and the guide block.

[0005] The objective of this utility model is achieved through the following means: A grinding wheel shaft assembly includes a shaft core and a locking block. The shaft core has a fixing part and a driving part at both ends, which cooperate with the locking block and an external driving component, respectively. A transmission block is provided at one end of the fixing part. A pressing block and a guide block are provided at the adjacent ends of the transmission block and the locking block, respectively. An inner support sleeve is provided between the pressing block and the guide block. A slidable fixing block is provided on the outer side of the locking block. The locking block is connected and cooperates with the fixing part and the fixing block by threaded connection.

[0006] Furthermore, a number of limiting key blocks are arranged around the outer side of the guide block, and a number of limiting grooves are provided on the inner side of the inner support sleeve to cooperate with the number of limiting key blocks.

[0007] Furthermore, the pressing block and the guide block are integrally formed on one end of the locking block and the transmission block, respectively.

[0008] Furthermore, both the extrusion block and the guide block have a tapered cross-section.

[0009] Furthermore, a return spring is sleeved on the outside of the transmission block, and the two ends of the return spring abut against the transmission block and the inner support sleeve, respectively.

[0010] Furthermore, both ends of the inner support sleeve are provided with several guide grooves.

[0011] Furthermore, the included angle between two adjacent guide slots is 45 degrees.

[0012] Furthermore, one end of the drive unit is provided with a fixing rivet.

[0013] The beneficial effects of this utility model are as follows: Through the threaded engagement between the locking block and the fixing part, the pressing block moves towards the guide block, pushing the inner support sleeve to expand radially outward and tightly fit against the inner hole of the grinding wheel. This achieves radial fixation of the grinding wheel while ensuring the coaxiality of the grinding wheel and the shaft core, effectively reducing vibration and runout during high-speed rotation, and improving grinding accuracy and safety. Furthermore, the threaded engagement between the locking block and the fixing block achieves axial fixation of the grinding wheel, preventing axial movement and ensuring the stability of the grinding wheel under high-speed operation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the first structure of a grinding wheel shaft assembly according to the present invention; Figure 2 This is a schematic diagram of the second structure of a grinding wheel shaft assembly according to the present invention; Figure 3 This is a cross-sectional view of a grinding wheel shaft assembly according to the present invention; Figure 4 This is an exploded view of a grinding wheel shaft assembly according to the present invention; The reference numerals in the figure are as follows: 1-shaft core, 11-fixed part, 111-block, 12-drive part, 13-fixed pull stud, 2-locking block, 3-transmission block, 31-guide block, 32-limiting key block, 33-slot, 4-pressing block, 5-inner support sleeve, 51-limiting groove, 52-guide groove, 6-fixed block, 7-reset spring, 8-protective sleeve, 81-sealing ring, 9-grinding wheel. Detailed Implementation

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0016] In this embodiment, refer to Figure 1 - Figure 4 The present invention relates to a grinding wheel shaft assembly, comprising a shaft core 1 and a locking block 2. The shaft core 1 has a fixing part 11 and a driving part 12 at both ends, which cooperate with the locking block 2 and an external driving component, respectively. A transmission block 3 is provided at one end of the fixing part 11. A pressing block 4 and a guide block 31 are provided at the adjacent ends of the transmission block 3 and the locking block 2, respectively. An inner support sleeve 5 is provided between the pressing block 4 and the guide block 31. A slidable fixing block 6 is provided on the outer side of the locking block 2. The locking block 2 is connected and cooperates with the fixing part 11 and the fixing block 6 by threaded connection.

[0017] In use, the transmission block 3, guide block 31, and inner support sleeve 5 are sequentially fitted onto the fixing part 11 of the shaft core 1, and the grinding wheel 9 is fitted onto the outer circumference of the inner support sleeve 5. Then, the pressing block 4 is inserted into the shaft core 1, contacting the other end of the inner support sleeve 5. Then, through the cooperation of the locking block 2 and the fixing part 11, the pressing block 4 is pushed towards the guide block 31, so that both ends of the inner support sleeve 5 cooperate with the pressing block 4 and the guide block 31 respectively, expanding outward, thereby tightly fitting with the mounting hole of the grinding wheel 9, and realizing the axial fixation of the grinding wheel 9.

[0018] The grinding wheel 9 is pressed firmly onto the transmission block 3 by the cooperation of the fixing block 6 and the locking block 2, preventing axial movement during high-speed operation. This ensures the stability and safety of the grinding wheel 9 under high-speed rotation and effectively avoids a decrease in machining accuracy due to vibration or loosening.

[0019] One end of the transmission block 3 is provided with a slot 33 that cooperates with the fixing part 11. The fixing part 11 is provided with a locking block 111 that cooperates with the transmission block 3. The circumferential positioning of the transmission block 3 and the shaft core 1 is achieved through the cooperation of the locking block 111 and the slot 33, thereby ensuring that when the shaft core 1 rotates, the transmission block 3 can be driven to rotate synchronously through the linkage of the locking block 111 and the slot 33, thereby achieving stable power transmission.

[0020] A protective sleeve 8 is provided between the transmission block 3 and the fixed part 11. A sealing ring 81 is provided between the protective sleeve 8 and the transmission block 3. The sealing ring 81 effectively prevents grinding dust and coolant from entering the connection area between the transmission block 3 and the shaft core 1, thereby preventing the locking block 111 and the locking groove 33 between the transmission block 3 and the shaft core 1 from getting stuck or worn due to contamination. This extends the service life of the components and ensures the long-term stability of transmission accuracy.

[0021] The extrusion block 4 and guide block 31 are integrally formed at one end of the locking block 2 and the transmission block 3, respectively. This integral design not only enhances the overall integrity and strength of the structure but also effectively avoids misalignment caused by assembly errors or loose connections, further ensuring the coaxiality and stability of the extrusion block 4 and guide block 31 when pushing the inner support sleeve 5. Simultaneously, this design simplifies the assembly process, reduces the number of parts, and improves production efficiency and product consistency.

[0022] A number of limiting key blocks 32 are arranged around the outer side of the guide block 31, and a number of limiting grooves 51 are provided on the inner side of the inner support sleeve 5 to cooperate with the limiting key blocks 32. Through the cooperation of the limiting key blocks 32 and the limiting grooves 51, the circumferential fixation between the inner support sleeve 5 and the guide block 31 is achieved, so that the inner support sleeve 5 always maintains synchronous rotation with the guide block 31 during the expansion process. Thus, the grinding wheel 9 is driven to rotate synchronously with the rotation of the shaft core 1 and the transmission block 3, ensuring the continuity and stability of power transmission.

[0023] Both the extrusion block 4 and the guide block 31 have conical cross-sections. This conical design allows the extrusion block 4 and guide block 31 to gradually expand radially when in contact with the inner support sleeve 5 via the inclined surface, ensuring uniform stress distribution on the inner support sleeve 5 and preventing deformation or breakage caused by localized stress concentration.

[0024] The inclination angle of the conical surface is 5° to 10°. This angle range ensures sufficient radial expansion force while effectively reducing axial pushing resistance and improving locking efficiency. This ensures that a small axial force is applied during the locking process to achieve full expansion of the inner support sleeve 5, reducing operational difficulty and improving assembly reliability.

[0025] A return spring 7 is sleeved on the outer side of the transmission block 3, with its two ends abutting against the transmission block 3 and the inner support sleeve 5, respectively. During installation, the inner support sleeve 5 is pushed by the return spring 7 and moves towards the pressing block 4, making contact with the conical surface of the pressing block 4. Subsequently, under the push of the locking block 2, the pressing block 4 and the inner support sleeve 5 move towards the guide block 31, compressing the spring. At the same time, the conical surface of the guide block 31 gradually contacts the inner support sleeve 5, causing the two ends of the inner support sleeve 5 to expand synchronously, thereby ensuring that the inner wall of the sleeve and the inner diameter of the grinding wheel 9 are uniformly fitted.

[0026] When the locking block 2 retracts, the return spring 7 releases its elastic potential energy, pushing the inner support sleeve 5 back towards the locking block 2 and disengaging from the conical surface of the guide block 31. The inner support sleeve 5 contracts under its own elastic recovery, achieving rapid separation from the inner diameter of the grinding wheel 9, thus facilitating the rapid replacement and maintenance of the grinding wheel 9.

[0027] Both ends of the inner support sleeve 5 are provided with several guide grooves 52. The guide grooves 52 are provided to make the inner support sleeve 5 move along a preset axial path during expansion and contraction, preventing it from rotating or deviating, and ensuring the stability of the movement trajectory and the repeatability of the positioning accuracy.

[0028] In this embodiment, four guide grooves 52 are provided at both ends of the inner support sleeve 5, and the included angle between two adjacent guide grooves 52 is 45 degrees. The included angles between the guide grooves 52 are equal, and they are evenly distributed on the outer periphery of the inner support sleeve 5, further improving the symmetry of force and the stability of movement. This layout ensures structural strength while effectively avoiding wall thickness reduction caused by excessively dense grooves, ensuring the fatigue life of the inner support sleeve 5 during repeated expansion and contraction.

[0029] One end of the drive unit 12 is provided with a fixing rivet 13. The fixing rivet 13 is used to connect with the output end of the drive components such as the machine tool spindle, thereby realizing the quick installation and fixation of the grinding wheel spindle. One end of the drive unit 12 is provided with a locating pin hole, which is used to cooperate with the locating pin on the drive component to further realize the circumferential fixation between the transmission block 3 and the drive component, ensuring the effective transmission of torque, thereby preventing relative rotation during transmission and ensuring the stability and reliability of power transmission.

[0030] The beneficial effects of this utility model are as follows: Through the threaded engagement between the locking block 2 and the fixing part 11, the pressing block 4 moves towards the guide block 31, pushing the inner support sleeve 5 to expand radially outward and tightly fit against the inner hole of the grinding wheel 9. This achieves radial fixation of the grinding wheel 9 while ensuring the coaxiality of the grinding wheel 9 and the shaft core 1, effectively reducing vibration and runout during high-speed rotation and improving grinding accuracy and safety. Furthermore, through the threaded engagement between the locking block 2 and the fixing block 6, the axial fixation of the grinding wheel 9 is achieved, preventing axial movement of the grinding wheel 9 and ensuring the stability of the grinding wheel 9 under high-speed operation.

[0031] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the present utility model without departing from the scope of the present utility model shall fall within the scope of the present utility model.

Claims

1. A grinding wheel shaft assembly, comprising a shaft core (1) and a locking block (2), wherein the two ends of the shaft core (1) are respectively provided with a fixing part (11) and a driving part (12) that cooperate with the locking block (2) and an external driving component, characterized in that: One end of the fixed part (11) is provided with a transmission block (3). The adjacent ends of the transmission block (3) and the locking block (2) are respectively provided with a pressing block (4) and a guide block (31). An inner support sleeve (5) is provided between the pressing block (4) and the guide block (31). A slidable fixing block (6) is provided on the outside of the locking block (2). The locking block (2) is connected and cooperated with the fixed part (11) and the fixing block (6) respectively by threaded connection.

2. The sharpening wheel axle assembly of claim 1, wherein: The guide block (31) is surrounded by several limiting key blocks (32), and the inner support sleeve (5) is provided with several limiting grooves (51) that cooperate with the several limiting key blocks (32).

3. The sharpening wheel axle assembly of claim 1, wherein: The pressing block (4) and the guide block (31) are integrally formed on one end of the locking block (2) and the transmission block (3), respectively.

4. The sharpening wheel shaft assembly of any one of claims 1-3, wherein: The cross-sections of the extrusion block (4) and the guide block (31) are both tapered.

5. The sharpening wheel shaft assembly of claim 1, wherein: A return spring (7) is sleeved on the outside of the transmission block (3), and the two ends of the return spring (7) abut against the transmission block (3) and the inner support sleeve (5) respectively.

6. The sharpening wheel axle assembly of claim 1, wherein: Both ends of the inner support sleeve (5) are provided with several guide grooves (52).

7. The sharpening wheel axle assembly of claim 6, wherein: The included angle between two adjacent guide grooves (52) is 45 degrees.

8. The sharpening wheel axle assembly of claim 1, wherein: One end of the drive unit (12) is provided with a fixing rivet (13).

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