quick-change sandpaper grinding wheel

Abstract

This invention discloses a quick-change sandpaper grinding wheel, comprising a grinding wheel body and sandpaper disposed on the grinding wheel body; it also includes a clamping assembly and a locking assembly. Locking cavities are provided through both ends of the grinding wheel body, and openings communicating with the locking cavities are provided on the periphery of the grinding wheel body. The clamping assembly includes an operating rod disposed on the grinding wheel body corresponding to the locking cavity, a pressure roller linked to the outer periphery of the operating rod, and a support plate hinged to the pressure roller via a rotating shaft. The sandpaper covers the outer periphery of the grinding wheel body, with both ends passing through the openings on the grinding wheel body and extending between the pressure roller and the support plate. The locking assembly acts on the clamping assembly, causing the pressure roller and the support plate to clamp the sandpaper. This invention allows for quick sandpaper replacement and has the advantages of convenient operation, time and labor saving, and greater environmental friendliness.

Description

Technical Field

[0001] This invention belongs to the technical field of grinding devices, and relates to a grinding wheel, particularly a grinding wheel with quick sandpaper replacement. Background Technology

[0002] The shoe last is the mother body of a shoe; it's the mold that shapes the shoe. The shoe last not only determines the shoe's shape and style but also its fit and ability to protect the foot. During the shoe last design and development process, due to various factors, last polishing in the workshop is an indispensable step. Last polishing is typically done using grinding wheels and sandpaper.

[0003] Existing grinding wheels are generally bonded abrasives that bind ordinary abrasives into a specific shape (mostly circular with a central through-hole) using a bonding agent, giving them a certain strength. Common types include ceramic (bonded) grinding wheels, resin (bonded) grinding wheels, and rubber (bonded) grinding wheels. However, grinding wheels used in laboratories for shoe last polishing typically consist of a metal ring with glue applied to the outer surface to attach a soft rubber body. A second layer of glue is then applied to the soft rubber body to adhere and fix the sandpaper. After drying, the metal ring is fitted onto the grinding wheel shaft for use. Once the sandpaper is worn out, the entire sandpaper and soft rubber body need to be cut and replaced with new sandpaper. This process involves complex and time-consuming procedures, including the secondary bonding and replacement of the soft rubber body, and the replacement and length control of the sandpaper. Furthermore, the glue used for bonding is toxic. Summary of the Invention

[0004] The purpose of this invention is to provide a sanding wheel with quick sandpaper replacement. This invention allows for quick sandpaper replacement and has the advantages of convenient operation, time and labor saving, and greater environmental friendliness.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a quick-change sandpaper grinding wheel, comprising a grinding wheel body and sandpaper disposed on the grinding wheel body; further comprising a clamping assembly and a locking assembly, wherein locking cavities are provided through both ends of the grinding wheel body, and openings communicating with the locking cavities are provided on the periphery of the grinding wheel body; the clamping assembly comprises an operating rod disposed on the part of the grinding wheel body corresponding to the locking cavity, a pressure roller linked to the outer periphery of the operating rod, and a support plate hinged to the pressure roller via a rotating shaft; the sandpaper covers the outer periphery of the grinding wheel body, and both ends of the sandpaper pass through the openings on the grinding wheel body and extend between the pressure roller and the support plate, and the locking assembly acts on the clamping assembly to cause the pressure roller and the support plate to clamp the sandpaper.

[0006] By adopting the above technical solution, when installing sandpaper, the sandpaper is wrapped around the outer circumference of the grinding wheel body. Then, both ends of the sandpaper are passed through the openings on the grinding wheel body and inserted between the pressure roller and the support plate. By operating the locking component, the pressure roller and the support plate clamp the sandpaper, thus installing it. When it is necessary to remove the sandpaper, the locking component engages the lock between the pressure roller and the support plate, allowing the ends of the sandpaper to be pulled out from between them for replacement. Therefore, this method allows for quick sandpaper replacement and offers advantages such as convenient operation, time and labor saving, and environmental friendliness.

[0007] The invention is further configured such that the pressure roller is provided with a positioning pin, and the support plate is provided with a positioning hole for the positioning pin to pass through.

[0008] By adopting the above technical solution, while the pressure roller and the support plate clamp the end of the sandpaper, the positioning pin on the pressure roller punctures and penetrates the sandpaper into the positioning hole of the support plate, which can play a role in preventing the sandpaper from loosening and further improve the firmness of the sandpaper installation.

[0009] The invention is further configured such that the operating lever is rotatably mounted on the grinding wheel body, and the locking assembly includes a spring plate and an elastic element. One end of the elastic element is connected to the grinding wheel body, and the other end of the elastic element is connected to the end of the support plate away from the rotating shaft, causing the support plate to have a tendency to rotate away from the pressure wheel. One end of the spring plate is rotatably connected to the grinding wheel body, and the other end of the spring plate is provided with a locking protrusion. The side of the support plate away from the pressure wheel is provided with a plurality of locking recesses along the length direction for cooperating with the locking protrusion. Under the action of the elastic element, the locking protrusion on the spring plate is engaged with the corresponding locking recess on the support plate. When the locking protrusion is engaged with the locking recess closest to the rotating shaft, the positioning pin is completely disengaged from the positioning hole, and the middle part of the spring plate is always pressed against the inner wall of the locking cavity.

[0010] By adopting the above technical solution, the tightness of the sandpaper can be adjusted. Since the spring plate always applies preload to the support plate, and the support plate remains in contact with the spring plate under the action of the elastic element, the angle between the pressure roller and the support plate is at its maximum when the locking protrusion of the spring plate is embedded in the locking protrusion closest to the rotating shaft on the support plate. At this time, the positioning pin on the pressure roller is completely disengaged from the positioning hole on the support plate. In this state, the end of the sandpaper is inserted between the pressure roller and the support plate, driving the operating lever to rotate, causing the pressure roller to rotate. During rotation, the angle between the pressure roller and the support plate decreases, and at the same time, the positioning pin on the pressure roller pierces the sandpaper and extends into the positioning hole of the support plate. Continue to rotate the operating lever to drive the pressure roller to rotate until the locking protrusion on the pressure roller matches the next adjacent locking recess on the support plate. As the rotation angle of the pressure roller increases, the sandpaper is installed more tightly (pulled by the pressure roller and the support plate), and vice versa. It can be seen that it not only facilitates the installation and removal of sandpaper, but also allows for the adjustment of the sandpaper tension, so that the sandpaper maintains appropriate tension and does not deviate during operation.

[0011] The invention is further configured such that a first through hole is provided on the grinding wheel body, the middle part of the operating rod passes through the first through hole, there are two pressure wheels, and the pressure wheels are provided with a second through hole. The two ends of the operating rod pass through the second through hole of the corresponding pressure wheel, and the end of the operating rod is interference-fitted with the second through hole of the corresponding pressure wheel.

[0012] By adopting the above technical solution, the installation structure is simple and reliable, which is conducive to assembly and production.

[0013] The present invention is further configured such that an internal hexagonal hole is provided through the operating lever along the axial direction.

[0014] By adopting the above technical solution, a hex wrench can be inserted into the internal hexagonal hole of the operating rod, and the operating rod can be rotated by rotating the hex wrench, which has the advantages of easy and labor-saving operation.

[0015] The invention is further configured such that the pressure roller is made of plastic and the support plate is made of metal.

[0016] By adopting the above technical solution, the pressure roller and the support plate use a soft-hard contact method, which not only has a better locking effect, but also avoids irreversible deformation when the two are squeezed together, thus protecting the components.

[0017] The invention is further configured such that the spring sheet is in the shape of an inverted triangle, and each end of the spring sheet is provided with a curled portion. The grinding wheel body is provided with a third through hole, and a support rod is provided through the third through hole. The support rod has a C-shaped cross section. The curled portions at both ends of the spring sheet are respectively sleeved on the two ends of the support rod, and the open end of the support rod is located away from the end of the curled portion.

[0018] By adopting the above technical solution, its installation is very convenient. The support rod has a C-shaped cross-section and has a certain degree of elasticity, which can reduce the requirements for processing accuracy, reduce the processing difficulty, and make it more conducive to production and assembly.

[0019] The invention is further configured such that the elastic element includes a first tension spring and a second tension spring, the spring sheet is provided with a first connecting hole and a second connecting hole, the grinding wheel body is provided with a through threaded hole, and a connecting screw is threadedly connected to the threaded hole. The first tension spring and the second tension spring are respectively provided at both ends of the grinding wheel body. One end of the first tension spring is inserted into the first connecting hole, and the other end of the first tension spring is attached to the threaded part of the connecting screw. The screw head of the connecting screw provides axial limitation for the end of the first tension spring away from the spring sheet. One end of the second tension spring is inserted into the second connecting hole, and the other end of the second tension spring is attached to the threaded part of the connecting screw. A limiting nut for providing axial limitation for the end of the second tension spring away from the spring sheet is also threadedly connected to the connecting screw.

[0020] By adopting the above technical solution, the elastic element is arranged with tension springs on both the left and right sides, which not only makes the spring sheet more evenly stressed and improves its service life, but also makes the installation structure of the two tension springs simple and reliable, and very convenient to disassemble and assemble.

[0021] The present invention is further configured such that the grinding wheel body includes a base wheel and an outer sleeve, the base wheel is made of metal, the outer sleeve is made of metal or wood, the outer sleeve is fitted around the outer periphery of the base wheel and the two are glued together, the outer periphery of the base wheel is provided with a plurality of positioning protrusions, and the inner periphery of the outer sleeve is provided with a plurality of positioning grooves that fit with the positioning protrusions.

[0022] By adopting the above technical solution, the grinding wheel body consists of a base wheel and an outer sleeve. The outer sleeve can be made of different hardness materials depending on the grinding material, making it more flexible in use.

[0023] The present invention is further configured such that a shaft hole for mounting a drive shaft is provided in the middle of the grinding wheel body, and a ramp is provided at the end of the grinding wheel body. A mounting hole communicating with the shaft hole is provided on the ramp. The central axis of the mounting hole is inclined to the central axis of the shaft hole. A locking screw for abutting the drive shaft inserted into the shaft hole is threaded on the mounting hole.

[0024] By adopting the above technical solution, the linkage between the grinding wheel body and the drive shaft can be achieved by tightening the locking screw. The structure is simple and reliable, and disassembly and assembly are very convenient. Attached Figure Description

[0025] Figure 1 This is a first-view structural diagram of the entire invention;

[0026] Figure 2 This is a schematic diagram of the overall structure of the present invention from a second perspective.

[0027] Figure 3 for Figure 2 Enlarged structural diagram of section A in the middle;

[0028] Figure 4 This is a schematic diagram of the mating structure of the clamping component and the locking component of the present invention;

[0029] Figure 5 This is a schematic diagram of the pressure roller of the present invention;

[0030] Figure 6 This is a schematic diagram of the structure of the support sheet of the present invention;

[0031] Figure 7 This is a schematic diagram of the structure of the grinding wheel body of the present invention.

[0032] In the diagram: 1. Grinding wheel body; 2. Sandpaper; 3. Clamping assembly; 4. Locking assembly; 5. Locking cavity; 6. Opening; 7. Operating lever; 8. Pressure roller; 9. Rotating shaft; 10. Support plate; 11. Positioning hole; 12. Positioning pin; 13. Spring plate; 14. Elastic element; 15. Locking protrusion; 16. Locking recess; 17. First through hole; 18. Second through hole; 19. Socket headstock hole; 20. Curved part; 21. Third through hole; 22. Support rod; 23. First tension spring; 24. Second tension spring; 25. First connecting hole; 26. Second connecting hole; 27. Screw hole; 28. Connecting screw; 29. ​​Limiting nut; 30. Base wheel; 31. Outer sleeve; 32. Positioning protrusion; 33. Positioning groove; 34. Shaft hole; 35. Inclined platform; 36. Mounting hole; 37. Locking screw. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Example: As attached Figures 1-7The quick-change sandpaper grinding wheel shown includes a grinding wheel body 1 and sandpaper 2 disposed on the grinding wheel body 1. The grinding wheel also includes a clamping assembly 3 and a locking assembly 4. The grinding wheel body 1 has locking cavities 5 extending through both ends, and the grinding wheel body 1 has openings 6 on its periphery that communicate with the locking cavities 5. The clamping assembly 3 includes an operating rod 7 disposed on the grinding wheel body 1 at the location corresponding to the locking cavity 5, a pressure roller 8 linked to the outer periphery of the operating rod 7, and a support plate 10 hinged to the pressure roller 8 via a rotating shaft 9. The sandpaper 2 covers the outer periphery of the grinding wheel body 1, and both ends of the sandpaper 2 pass through the openings 6 on the grinding wheel body 1 and extend between the pressure roller 8 and the support plate 10. The locking assembly 4 acts on the clamping assembly 3 to cause the pressure roller 8 and the support plate 10 to clamp the sandpaper 2. When installing sandpaper 2, wrap sandpaper 2 around the outer circumference of the grinding wheel body 1, then pass both ends of sandpaper 2 through the opening 6 on the grinding wheel body 1 and insert them between the pressure roller 8 and the support plate 10. By operating the locking component 4, the pressure roller 8 and the support plate 10 will clamp the sandpaper 2, thus installing sandpaper 2. When it is necessary to remove sandpaper 2, by operating the locking component 4 to engage the lock on the pressure roller 8 and the support plate 10, the ends of sandpaper 2 can be pulled out from between the pressure roller 8 and the support plate 10, and sandpaper 2 can be removed for replacement. It can be seen that it can quickly replace sandpaper 2, and has the advantages of convenient operation, saving time and effort, and being more environmentally friendly.

[0035] As attached Figures 4-6 As shown, the pressure roller 8 is provided with a positioning pin 12, and the support plate 10 is provided with a positioning hole 11 for the positioning pin 12 to pass through. When the pressure roller 8 and the support plate 10 clamp the end of the sandpaper 2, the positioning pin 12 on the pressure roller 8 punctures and passes through the sandpaper 2 and extends into the positioning hole 11 of the support plate 10, which can play a role in preventing the sandpaper 2 from loosening and further improve the firmness of the sandpaper 2 installation.

[0036] As attached Figures 1-7As shown, the operating lever 7 is rotatably mounted on the grinding wheel body 1. The locking assembly 4 includes a spring plate 13 and an elastic element 14. One end of the elastic element 14 is connected to the grinding wheel body 1, and the other end of the elastic element 14 is connected to the end of the support plate 10 away from the rotating shaft 9, causing the support plate 10 to have a tendency to rotate away from the pressure roller 8. One end of the spring plate 13 is rotatably connected to the grinding wheel body 1, and the other end of the spring plate 13 is provided with a locking protrusion 15. The side of the support plate 10 away from the pressure roller 8 is provided with a locking protrusion 15 along its length. The support plate 10 is provided with multiple locking recesses 16 for cooperating with the locking protrusions 15. Under the action of the elastic member 14, the locking protrusions 15 on the spring plate 13 are engaged with the corresponding locking recesses 16 on the support plate 10. When the locking protrusions 15 are engaged with the locking recesses 16 closest to the rotating shaft 9, the positioning pin 12 is completely disengaged from the positioning hole 11. In this embodiment, there are three locking recesses 16. The grinding wheel has three tension adjustment levels. The middle part of the spring plate 13 is always pressed against the inner wall of the locking cavity 5. This structure allows for adjustment of the sandpaper tension. Since the spring plate 13 always applies preload to the support plate 10, and the support plate 10 remains pressed against the spring plate 13 under the action of the elastic element 14, when the locking protrusion 15 of the spring plate 13 is inserted into the locking protrusion 15 closest to the rotating shaft 9 on the support plate 10, the angle between the pressure roller 8 and the support plate 10 is at its maximum. At this time, the positioning pin 12 on the pressure roller 8 is completely disengaged from the positioning hole 11 on the support plate 10. In this state, the end of the sandpaper 2 is inserted between the pressure roller 8 and the support plate 10, driving the operating lever 7 to rotate, causing the pressure roller 8 to rotate. During rotation, the angle between the pressure roller 8 and the support plate 10 decreases. At the same time, the positioning pin 12 on the pressure roller 8 punctures the sandpaper 2 and extends into the positioning hole 11 of the support plate 10. The operating lever 7 continues to rotate, driving the pressure roller 8 to rotate until the locking protrusion 15 on the pressure roller 8 engages with the next adjacent locking recess 16 on the support plate 10. As the rotation angle of the pressure roller 8 increases, the sandpaper 2 is installed more tightly (pulled by the pressure roller 8 and the support plate 10), and vice versa. It can be seen that it not only facilitates the installation and removal of the sandpaper 2, but also allows for the adjustment of the tension of the sandpaper 2, so that the sandpaper 2 maintains appropriate tension and does not deviate during operation.

[0037] As attached Figures 1-7 As shown, the grinding wheel body 1 has a first through hole 17, and the operating rod 7 passes through the first through hole 17. There are two pressure rollers 8, and each pressure roller 8 has a second through hole 18. The two ends of the operating rod 7 pass through the second through hole 18 of the corresponding pressure roller 8, and the ends of the operating rod 7 are interference-fitted with the second through hole 18 of the corresponding pressure roller 8. This design has a simple and reliable installation structure, which is conducive to assembly and production.

[0038] As attached Figure 4As shown, an internal hexagonal hole 19 is provided axially through the operating lever 7. A hexagonal wrench can be inserted into the internal hexagonal hole 19 of the operating lever 7, and the operating lever 7 can be rotated by rotating the hexagonal wrench, which has the advantages of easy and labor-saving operation.

[0039] The pressure roller 8 is made of plastic, while the support plate 10 is made of metal (such as stainless steel). The pressure roller 8 and the support plate 10 use a soft-hard contact method, which not only provides a better locking effect but also prevents irreversible deformation when they are squeezed together, thus protecting the components.

[0040] As attached Figure 3 and attached Figure 7 As shown, the spring sheet 13 is C-shaped, and each end of the spring sheet 13 has a curled portion 20, which is integral with the spring sheet 13 and is formed by bending the end of the spring sheet 13 itself. The grinding wheel body 1 has a third through hole 21, through which a support rod 22 is inserted. The support rod 22 has a C-shaped cross-section. The curled portions 20 at both ends of the spring sheet 13 are respectively fitted onto the two ends of the support rod 22, and the opening 6 end of the support rod 22 is located away from the end of the curled portion 20. Its installation is very convenient. The C-shaped cross-section of the support rod 22 has a certain degree of elasticity, which can reduce the requirements for machining accuracy, reduce the machining difficulty, and facilitate production assembly.

[0041] As attached Figure 1 , 2 As shown in Figure 4, the elastic element 14 includes a first tension spring 23 and a second tension spring 24. The spring plate 13 is provided with a first connecting hole 25 and a second connecting hole 26. The grinding wheel body 1 is provided with a through screw hole 27, and a connecting screw 28 is threaded onto the screw hole 27. The first tension spring 23 and the second tension spring 24 are respectively provided at both ends of the grinding wheel body 1. One end of the first tension spring 23 is inserted into the first connecting hole 25, and the other end of the first tension spring 23 is attached to the screw rod of the connecting screw 28. The screw head of the connecting screw 28 provides axial limitation for the end of the first tension spring 23 away from the spring plate 13. One end of the second tension spring 24 is inserted into the second connecting hole 26, and the other end of the second tension spring 24 is attached to the screw rod of the connecting screw 28. A limiting nut 29 for providing axial limitation for the end of the second tension spring 24 away from the spring plate 13 is also threaded onto the connecting screw 28. The elastic element 14 is arranged with tension springs on both the left and right sides, which not only makes the spring sheet 13 more evenly stressed and improves its service life, but also makes the installation structure of the two tension springs simple and reliable, and very convenient to disassemble and assemble.

[0042] As attached Figure 7As shown, the grinding wheel body 1 includes a base wheel 30 and an outer sleeve 31. The base wheel 30 is made of metal (such as stainless steel or aluminum), and the outer sleeve 31 is made of metal or wood. The outer sleeve 31 is fitted onto the outer periphery of the base wheel 30, and the two are glued together. The outer periphery of the base wheel 30 has multiple positioning protrusions 32, and the inner periphery of the outer sleeve 31 has multiple positioning grooves 33 that mate with the positioning protrusions 32. The grinding wheel body 1 is composed of the base wheel 30 and the outer sleeve 31. The outer sleeve 31 can be made of materials with different hardnesses depending on the grinding material, making it more flexible in use.

[0043] As attached Figure 1 and attached Figure 7 As shown, the grinding wheel body 1 has a shaft hole 34 in the middle for mounting the drive shaft, and a ramp 35 at the end of the grinding wheel body 1. The ramp 35 has a mounting hole 36 that communicates with the shaft hole 34. The mounting hole 36 has an internal thread, and the central axis of the mounting hole 36 is inclined to the central axis of the shaft hole 34. A locking screw 37 for abutting the drive shaft inserted into the shaft hole 34 is threaded onto the mounting hole 36. The locking screw 37 is an internal hexagon screw, a slotted screw, or a Phillips head screw. By tightening the locking screw 37, the grinding wheel body 1 and the drive shaft can be linked together. The structure is simple and reliable, and disassembly and assembly are very convenient.

Claims

1. A quick-change sanding wheel, comprising a wheel body (1) and sandpaper (2) disposed on the wheel body (1); characterized in that: It also includes a clamping assembly (3) and a locking assembly (4). The grinding wheel body (1) has locking cavities (5) extending through both ends. The grinding wheel body (1) has openings (6) on its periphery that communicate with the locking cavities (5). The clamping assembly (3) includes an operating rod (7) located on the grinding wheel body (1) corresponding to the locking cavity (5), a pressure roller (8) mounted on the outer periphery of the operating rod (7), and a support plate (10) hinged to the pressure roller (8) via a rotating shaft (9). The sandpaper (2) covers the grinding wheel body (1). The outer periphery, and the two ends of the sandpaper (2) pass through the opening (6) on the grinding wheel body (1) and extend into the space between the pressure roller (8) and the support plate (10), and through the locking component (4) acting on the clamping component (3), cause the pressure roller (8) and the support plate (10) to clamp the sandpaper (2); the pressure roller (8) is provided with a positioning pin (12), and the support plate (10) is provided with a positioning hole (11) for the positioning pin (12) to pass through; the operating rod (7) is rotatably mounted on the grinding wheel body (1), and the locking component (4) includes A spring plate (13) and an elastic element (14) are provided. One end of the elastic element (14) is connected to the grinding wheel body (1), and the other end of the elastic element (14) is connected to the end of the support plate (10) away from the rotating shaft (9), causing the support plate (10) to have a tendency to rotate away from the pressure roller (8). One end of the spring plate (13) is rotatably connected to the grinding wheel body (1), and the other end of the spring plate (13) is provided with a locking protrusion (15). The side of the support plate (10) away from the pressure roller (8) is arranged along the length direction. There are multiple locking recesses (16) for cooperating with the locking protrusion (15). Under the action of the elastic member (14), the support plate (10) makes the locking protrusion (15) on the spring plate (13) engage with the corresponding locking recess (16) on the support plate (10). When the locking protrusion (15) engages with the locking recess (16) closest to the rotating shaft (9), the positioning pin (12) completely disengages from the positioning hole (11), and the middle part of the spring plate (13) always abuts against the inner wall of the locking cavity (5).

2. The quick-change sandpaper grinding wheel according to claim 1, characterized in that: The grinding wheel body (1) has a first through hole (17), the middle part of the operating rod (7) passes through the first through hole (17), there are two pressure rollers (8), and the pressure rollers (8) have a second through hole (18). The two ends of the operating rod (7) pass through the second through hole (18) of the corresponding pressure roller (8), and the end of the operating rod (7) is interference-fitted with the second through hole (18) of the corresponding pressure roller (8).

3. The quick-change sandpaper grinding wheel according to claim 2, characterized in that: An internal hexagonal hole (19) is provided axially through the operating lever (7).

4. The quick-change sandpaper grinding wheel according to claim 1, characterized in that: The pressure roller (8) is made of plastic, and the support plate (10) is made of metal.

5. The quick-change sandpaper grinding wheel according to claim 1, characterized in that: The spring sheet (13) is in the shape of a c-shape. Each end of the spring sheet (13) is provided with a curled part (20). The grinding wheel body (1) is provided with a third through hole (21). A support rod (22) is provided through the third through hole (21). The cross-section of the support rod (22) is C-shaped. The curled parts (20) at both ends of the spring sheet (13) are respectively sleeved on the two ends of the support rod (22), and the opening (6) end of the support rod (22) is located away from the end of the curled part (20).

6. The quick-change sandpaper grinding wheel according to claim 1, characterized in that: The elastic element (14) includes a first tension spring (23) and a second tension spring (24). The spring sheet (13) has a first connecting hole (25) and a second connecting hole (26). A threaded hole (27) is provided through the grinding wheel body (1), and a connecting screw (28) is threaded onto the threaded hole (27). The first tension spring (23) and the second tension spring (24) are respectively located at both ends of the grinding wheel body (1). One end of the first tension spring (23) is inserted into the first connecting hole (25). The other end is attached to the threaded part of the connecting screw (28), and the screw head of the connecting screw (28) forms an axial limit on the end of the first tension spring (23) away from the spring plate (13). One end of the second tension spring (24) is inserted into the second connecting hole (26), and the other end of the second tension spring (24) is attached to the threaded part of the connecting screw (28). A limiting nut (29) for forming an axial limit on the end of the second tension spring (24) away from the spring plate (13) is also threaded onto the connecting screw (28).

7. The quick-change sandpaper grinding wheel according to claim 1, characterized in that: The grinding wheel body (1) includes a base wheel (30) and an outer sleeve (31). The base wheel (30) is made of metal, and the outer sleeve (31) is made of metal or wood. The outer sleeve (31) is fitted around the base wheel (30) and the two are glued together. The outer circumference of the base wheel (30) is provided with a plurality of positioning protrusions (32), and the inner circumference of the outer sleeve (31) is provided with a plurality of positioning grooves (33) that fit with the positioning protrusions (32).

8. The quick-change sandpaper grinding wheel according to claim 1, characterized in that: The grinding wheel body (1) has a shaft hole (34) for mounting a drive shaft in the middle, and a ramp (35) is provided at the end of the grinding wheel body (1). The ramp (35) has a mounting hole (36) that communicates with the shaft hole (34). The central axis of the mounting hole (36) is inclined to the central axis of the shaft hole (34). A locking screw (37) for abutting the drive shaft inserted into the shaft hole (34) is threaded on the mounting hole (36).

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