Polishing grinding wheel capable of rapidly replacing abrasive paper

Abstract

The invention discloses a grinding wheel capable of rapidly replacing abrasive paper. The grinding wheel comprises a grinding wheel body and the abrasive paper arranged on the grinding wheel body. The grinding wheel further comprises a clamping assembly and a locking assembly, locking cavities are formed in the two ends of the grinding wheel body in a penetrating mode, and openings communicating with the locking cavities are formed in the peripheral side of the grinding wheel body. The clamping assembly comprises an operating rod arranged at the position, corresponding to the locking cavity, of the grinding wheel body, a pressing wheel installed on the periphery of the operating rod in a linkage mode and a supporting piece hinged to the pressing wheel through a rotating shaft. The abrasive paper wraps the periphery of the grinding wheel body, the two ends of the abrasive paper penetrate through the opening in the grinding wheel body and stretch into the position between the pressing wheel and the supporting piece, the locking assembly acts on the clamping assembly, and the pressing wheel and the supporting piece are promoted to clamp the abrasive paper. The abrasive paper can be quickly replaced, and the device has the advantages of being convenient to operate, time-saving, labor-saving and more environment-friendly.

Description

Technical Field

[0001] The invention belongs to the technical field of grinding devices and relates to a grinding wheel, in particular to a grinding wheel for quickly replacing sandpaper. Background Art

[0002] The shoe last is the mother of the shoe. It is the molding mold of the shoe. The shoe last not only determines the shape and style of the shoe, but also determines whether the shoe fits the foot and whether it can protect the foot. In the process of shoe last design and development, due to various factors, shoe last polishing in the studio is an indispensable link. The shoe last is usually polished with a grinding wheel and sandpaper.

[0003] Existing grinding wheels are generally made of ordinary abrasives bonded by a binder into a certain shape (mostly round with a through hole in the center) and have a certain strength. Common ones include ceramic (bond) grinding wheels, resin (bond) grinding wheels, rubber (bond) grinding wheels, etc. The grinding wheels used for shoe last grinding in the laboratory are usually made by applying glue on the outer surface of the metal ring to stick the soft colloid, and then applying glue to the soft colloid for a second time to stick the sandpaper on and fix it. After drying, the metal ring is fixed on the grinding wheel machine shaft for use. After the sandpaper is worn out, the sandpaper and soft colloid need to be cut as a whole and replaced with new sandpaper. In this process, the secondary sticking and replacement of the soft colloid; the replacement and length control process of the sandpaper are complicated and troublesome, time-consuming and labor-intensive, and the glue is toxic. Summary of the invention

[0004] The purpose of the present invention is to provide a grinding wheel with a quickly replaceable sandpaper. The present invention can quickly replace the sandpaper and has the advantages of convenient operation, time-saving, labor-saving and more environmentally friendly.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a grinding wheel for quickly changing sandpaper, comprising a grinding wheel body and sandpaper arranged on the grinding wheel body; further comprising a clamping assembly and a locking assembly, wherein locking cavities are provided through-through at both ends of the grinding wheel body, and an opening communicating with the locking cavity is provided on the peripheral side of the grinding wheel body; the clamping assembly comprises an operating rod provided at a portion of the grinding wheel body corresponding to the locking cavity, a pressure wheel interlockingly installed on the periphery of the operating rod, and a support sheet hinged to the pressure wheel through a rotating shaft; the sandpaper is coated on the periphery of the grinding wheel body, and the two ends of the sandpaper pass through the openings on the grinding wheel body and extend between the pressure wheel and the support sheet, and the locking assembly acts on the clamping assembly to cause the pressure wheel and the support sheet to clamp the sandpaper.

[0006] By adopting the above technical solution, when installing the sandpaper, the sandpaper is wrapped around the outer periphery of the grinding wheel body, and then the two ends of the sandpaper are passed through the opening on the grinding wheel body and extended between the pressure wheel and the support sheet. By operating the locking component, the pressure wheel and the support sheet are clamped to clamp the sandpaper, so as to achieve the installation of the sandpaper; when the sandpaper needs to be removed, the locking component is operated to contact the pressure wheel and the support sheet, and the end of the sandpaper is pulled out from between the pressure wheel and the support sheet, and the sandpaper can be removed for replacement. It can be seen that it can quickly replace the sandpaper, which has the advantages of convenient operation, time-saving and labor-saving, and more environmentally friendly.

[0007] The present invention is further configured such that a positioning pin is provided on the pressure wheel, and a positioning hole for the positioning pin to pass through is provided on the support sheet.

[0008] By adopting the above technical solution, while the pressure wheel and the support sheet clamp the end of the sandpaper, the positioning needle on the pressure wheel pierces and passes through the sandpaper and extends into the positioning hole of the support sheet, which can prevent the sandpaper from loosening and further improve the firmness of the sandpaper installation.

[0009] The present invention is further configured as follows: the operating rod is rotatably arranged on the grinding wheel body, and the locking assembly includes a spring sheet and an elastic member, one end of the elastic member is connected to the grinding wheel body, and the other end of the elastic member is connected to an end of the support sheet away from the rotating shaft, so that the support sheet has a tendency to rotate in the direction away from the pressure wheel, one end of the spring sheet is rotatably connected to the grinding wheel body, and the other end of the spring sheet is provided with a locking protrusion, and a side of the support sheet away from the pressure wheel is provided with a plurality of locking recesses for cooperating with the locking protrusion along the length direction, and under the action of the elastic member, the locking protrusion on the spring sheet and the corresponding locking recess on the support sheet are matched, and when the locking protrusion is matched with a locking recess closest to the rotating shaft, the positioning pin is completely disengaged from the positioning hole, and the middle part of the spring sheet is always pressed against the inner wall of the locking cavity.

[0010] By adopting the above technical solution, the adjustment of the tightness of the sandpaper can be realized. Since the spring piece always applies a pre-tightening force to the support piece, and the support piece always remains in a state of being in contact with the spring piece under the action of the elastic member. When the locking convex portion of the spring piece is embedded into the locking convex portion closest to the rotating shaft on the support piece, the opening angle between the pressure wheel and the support piece is the largest. At this time, the positioning pin on the pressure wheel completely disengages from the positioning hole on the support piece. In this state, the end of the sandpaper is inserted between the pressure wheel and the support piece, and the operating rod is driven to rotate, prompting the pressure wheel to rotate. During the rotation of the pressure wheel, the angle between the pressure wheel and the support piece becomes smaller. At the same time, the positioning pin on the pressure wheel pierces through the sandpaper and extends into the positioning hole of the support piece. Continuing to rotate the operating rod to drive the pressure wheel to rotate until the locking convex portion on the pressure wheel fits with the next adjacent locking concave portion on the support piece. And as the rotation angle of the pressure wheel increases, the sandpaper is installed tighter (pulled by the pressure wheel and the support piece), and vice versa, it is looser. Thus, it can not only facilitate the disassembly and assembly of the sandpaper, but also adjust the tightness of the sandpaper, so that the sandpaper maintains an appropriate tightness during work and does not deviate.

[0011] The present invention is further configured such that a first through hole is provided on the grinding wheel main body, the middle part of the operating rod is inserted into the first through hole, the number of the pressure wheels is two, and a second through hole is provided on the pressure wheel. The two ends of the operating rod are respectively inserted into the second through holes of the corresponding pressure wheels, and the end of the operating rod is in interference fit 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 beneficial to assembly production.

[0013] The present invention is further configured such that an internal hexagonal hole is axially provided through the operating rod.

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

[0015] The present invention is further configured such that the pressure wheel is made of plastic material, and the support piece is made of metal material.

[0016] By adopting the above technical solution, the pressure wheel and the support piece adopt a soft-hard contact method, which not only has a better locking effect, but also can avoid irreversible deformation generated when the two are press-fitted, playing a role in protecting the components.

[0017] The present invention is further configured such that the spring piece is in a C-shaped shape, a curling portion is provided at each end of the spring piece, a third through hole is provided on the grinding wheel main body, a support rod is provided through the third through hole, the cross section of the support rod is in a C-shaped shape, the curling portions at both ends of the spring piece are respectively sleeved on both ends of the support rod, and the open end of the support rod is arranged away from the end of the curling portion.

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

[0019] The present invention is further configured as follows: the elastic member 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 screw hole, the screw hole is threadedly connected with a connecting screw, the first tension spring and the second tension spring are respectively arranged at both ends of the grinding wheel body, one end of the first tension spring is inserted into the first connecting hole, the other end of the first tension spring is overlapped on the screw portion of the connecting screw, and the screw head of the connecting screw is used to axially limit 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, the other end of the second tension spring is overlapped on the screw portion of the connecting screw, and the connecting screw is also threadedly connected with a limiting nut for axially limiting the end of the second tension spring away from the spring sheet.

[0020] By adopting the above technical solution, the elastic member adopts the tension spring arrangement on the left and right sides, which not only makes the spring sheet more evenly stressed and improves its service life, but also the installation structure of the two tension springs is simple and reliable, and is very convenient for disassembly and assembly.

[0021] The present invention is further configured as follows: the grinding wheel body includes a base wheel and an outer sleeve, the base wheel is made of metal material, the outer sleeve is made of metal or wood material, the outer sleeve is arranged on the outer periphery of the base wheel and the two are glued together by glue, 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 matching the positioning protrusions.

[0022] By adopting the above technical solution, the grinding wheel body is composed of a base wheel and a jacket. The jacket can be made of materials of different hardness according to the grinding material, which makes it more flexible to use.

[0023] The present invention is further configured such that an axial hole for installing a driving shaft is provided in the middle of the grinding wheel body, and an inclined platform is provided at the end of the grinding wheel body, a mounting hole connected to the axial hole is provided on the inclined platform, a central axis of the mounting hole is inclined to the central axis of the axial hole, and a locking screw is threadedly connected to the mounting hole for tightening the driving shaft inserted into the axial hole.

[0024] By adopting the above technical solution, the linkage cooperation between the grinding wheel body and the driving shaft can be achieved by tightening the locking screw, the structure is simple and reliable, and disassembly and assembly are very convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the first viewing angle of the whole present invention; Figure 2A second perspective structural schematic diagram of the present invention as a whole; Figure 3 for Figure 2 A schematic diagram of the enlarged structure of the middle part A; Figure 4 It is a schematic diagram of the matching structure of the clamping assembly and the locking assembly of the present invention; Figure 5 It is a schematic diagram of the structure of the pressing wheel of the present invention; Figure 6 It is a structural schematic diagram of the support sheet of the present invention; Figure 7 It is a structural schematic diagram of the grinding wheel main body of the present invention.

[0026] In the figure: 1. grinding wheel body; 2. sandpaper; 3. clamping assembly; 4. locking assembly; 5. locking cavity; 6. opening; 7. operating rod; 8. pressure wheel; 9. rotating shaft; 10. supporting plate; 11. positioning hole; 12. positioning pin; 13. spring plate; 14. elastic member; 15. locking protrusion; 16. locking recess; 17. first through hole; 18. second through hole; 19. hexagonal hole; 20. curling part; 21. third through hole; 22. supporting 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. ramp; 36. mounting hole; 37. locking screw. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Example: As shown in the attached Figures 1 to 7The grinding wheel for quick sandpaper replacement shown in the figure comprises a grinding wheel body 1 and sandpaper 2 arranged on the grinding wheel body 1; the grinding wheel also comprises a clamping assembly 3 and a locking assembly 4, locking cavities 5 are provided through both ends of the grinding wheel body 1, and an opening 6 connected to the locking cavity 5 is provided on the circumference of the grinding wheel body 1; the clamping assembly 3 comprises an operating rod 7 provided at a portion of the grinding wheel body 1 corresponding to the locking cavity 5, a pressure wheel 8 installed on the periphery of the operating rod 7 in linkage, and a support sheet 10 hinged to the pressure wheel 8 through a rotating shaft 9; the sandpaper 2 is coated on the periphery of the grinding wheel body 1, and both ends of the sandpaper 2 pass through the opening 6 on the grinding wheel body 1 and extend between the pressure wheel 8 and the support sheet 10, and the locking assembly 4 acts on the clamping assembly 3 to cause the pressure wheel 8 and the support sheet 10 to clamp the sandpaper 2. When installing the sandpaper 2, wrap the sandpaper 2 around the outer periphery of the grinding wheel body 1, then pass the two ends of the sandpaper 2 through the opening 6 on the grinding wheel body 1 and extend between the pressure wheel 8 and the support sheet 10, and operate the locking component 4 to cause the pressure wheel 8 and the support sheet 10 to clamp the sandpaper 2, so as to achieve the installation of the sandpaper 2; when the sandpaper 2 needs to be removed, the locking component 4 is operated to contact the pressure wheel 8 and the support sheet 10, and the end of the sandpaper 2 is pulled out from between the pressure wheel 8 and the support sheet 10, so that the sandpaper 2 can be removed for replacement. It can be seen that the sandpaper 2 can be quickly replaced, which has the advantages of convenient operation, time-saving and labor-saving, and more environmentally friendly.

[0029] As attached Figures 4 to 6 As shown, the pressure wheel 8 is provided with a positioning pin 12, and the support sheet 10 is provided with a positioning hole 11 for the positioning pin 12 to pass through. While the pressure wheel 8 and the support sheet 10 clamp the end of the sandpaper 2, the positioning pin 12 on the pressure wheel 8 pierces and passes through the sandpaper 2 and extends into the positioning hole 11 of the support sheet 10, which can prevent the sandpaper 2 from loosening and further improve the firmness of the installation of the sandpaper 2.

[0030] As attached Figures 1 to 7As shown, the operating rod 7 is rotatably arranged on the grinding wheel body 1, and the locking assembly 4 includes a spring sheet 13 and an elastic member 14. One end of the elastic member 14 is connected to the grinding wheel body 1, and the other end of the elastic member 14 is connected to the end of the support sheet 10 away from the rotating shaft 9, so that the support sheet 10 has a tendency to rotate in a direction away from the pressure wheel 8. One end of the spring sheet 13 is rotatably connected to the grinding wheel body 1, and the other end of the spring sheet 13 is provided with a locking protrusion 15. The side of the support sheet 10 away from the pressure wheel 8 is provided with a locking protrusion 15 along the length direction. There are 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 sheet 13 of the support sheet 10 are matched with the corresponding locking recesses 16 on the support sheet 10, and when the locking protrusion 15 is matched with a locking recess 16 closest to the rotating shaft 9, the positioning pin 12 is completely separated from the positioning hole 11. In this embodiment, the number of locking recesses 16 is three, and the grinding wheel has three-speed tensioning adjustment. The middle part of the spring sheet 13 is always pressed against the inner wall of the locking cavity 5. The structure can be used to adjust the tension of the sandpaper 2. Since the spring sheet 13 always applies a preload force to the support sheet 10, and the support sheet 10 is always kept in a state of being pressed against the spring sheet 13 under the action of the elastic member 14, when the locking protrusion 15 of the spring sheet 13 is embedded in a locking protrusion 15 on the support sheet 10 that is closest to the rotating shaft 9, the angle between the pressure wheel 8 and the support sheet 10 is the largest. At this time, the positioning pin 12 on the pressure wheel 8 is completely separated from the positioning hole 11 on the support sheet 10. In this state, the end of the sandpaper 2 is inserted between the pressure wheel 8 and the support sheet 10, driving the operating rod 7 to rotate, causing the pressure wheel 8 to rotate, and the pressure wheel 8 During the rotation, the angle between the pressure wheel 8 and the support sheet 10 becomes smaller. At the same time, the positioning pin 12 on the pressure wheel 8 pierces the sandpaper 2 and extends into the positioning hole 11 of the support sheet 10. The operating lever 7 continues to be rotated to drive the pressure wheel 8 to rotate until the locking protrusion 15 on the pressure wheel 8 is matched with the next adjacent locking recess 16 on the support sheet 10. As the rotation angle of the pressure wheel 8 increases, the sandpaper 2 is installed tighter (pulled by the pressure wheel 8 and the support sheet 10), and vice versa. It can be seen that it not only facilitates the disassembly and assembly of the sandpaper 2, but also can adjust the tension of the sandpaper 2, so that the sandpaper 2 maintains a moderate tension during work and does not deviate.

[0031] As attached Figures 1 to 7 As shown, the grinding wheel body 1 is provided with a first through hole 17, the middle of the operating rod 7 is inserted into the first through hole 17, the number of the pressing wheels 8 is two, and the pressing wheel 8 is provided with a second through hole 18, the two ends of the operating rod 7 are respectively inserted into the second through holes 18 of the corresponding pressing wheel 8, and the end of the operating rod 7 is interference fit with the second through hole 18 of the corresponding pressing wheel 8. The design installation structure is simple and reliable, and is conducive to assembly production.

[0032] As attached Figure 4As shown, an internal hexagonal hole 19 is axially and penetratingly provided on the operating rod 7. A hexagonal wrench can be inserted into the internal hexagonal hole 19 of the operating rod 7, and the operating rod 7 is driven to rotate by rotating the hexagonal wrench, which has the advantages of easy and labor-saving operation.

[0033] Among them, the pressing wheel 8 is made of plastic material, and the supporting piece 10 is made of metal (such as stainless steel). The pressing wheel 8 and the supporting piece 10 adopt a soft-hard contact method, which not only has a better locking effect, but also can avoid irreversible deformation when the two are pressed and fitted, playing a role in protecting the parts.

[0034] As shown in the appendix Figure 3 and the appendix Figure 7 As shown, the spring piece 13 is in a U-shaped shape. Two curling parts 20 are respectively provided at both ends of the spring piece 13. The curling parts 20 are integral with the spring piece 13 and are formed by bending the end parts of the spring piece 13 itself. A third through hole 21 is provided on the grinding wheel body 1, and a support rod 22 is penetratingly provided on the third through hole 21. The cross section of the support rod 22 is in a C-shaped shape. The curling parts 20 at both ends of the spring piece 13 are respectively sleeved on both ends of the support rod 22, and the opening 6 end of the support rod 22 is arranged away from the end part of the curling part 20. Its installation is very convenient. The support rod 22 has a C-shaped structure and has a certain elasticity itself, which can reduce the requirement for machining accuracy, reduce the machining difficulty, and is more conducive to production and assembly.

[0035] As shown in the appendix Figure 1 、 2 、4, the elastic member 14 includes a first tension spring 23 and a second tension spring 24. A first connection hole 25 and a second connection hole 26 are provided on the spring piece 13. A threaded hole 27 is penetratingly provided on the grinding wheel body 1, and a connection screw 28 is threadedly connected to the threaded hole 27. The first tension spring 23 and the second tension spring 24 are respectively arranged at both ends of the grinding wheel body 1. One end of the first tension spring 23 is inserted into the first connection hole 25, the other end of the first tension spring 23 is lapped on the screw part of the connection screw 28, and the screw head of the connection screw 28 axially limits the end of the first tension spring 23 away from the spring piece 13. One end of the second tension spring 24 is inserted into the second connection hole 26, the other end of the second tension spring 24 is lapped on the screw part of the connection screw 28, and a limit nut 29 for axially limiting the end of the second tension spring 24 away from the spring piece 13 is also threadedly connected to the connection screw 28. The elastic member 14 adopts a layout of tension springs on both left and right sides, which not only makes the force on the spring piece 13 more uniform and improves its service life, but also the installation structure of the two tension springs is simple and reliable, and the disassembly and assembly are very convenient.

[0036] As shown in the appendix Figure 7As shown, the grinding wheel body 1 includes a base wheel 30 and a jacket 31, the base wheel 30 is made of metal (such as stainless steel or aluminum), the jacket 31 is made of metal or wood, the jacket 31 is sleeved on the outer periphery of the base wheel 30 and the two are glued together, the outer periphery of the base wheel 30 is provided with a plurality of positioning protrusions 32, and the inner periphery of the jacket 31 is provided with a plurality of positioning grooves 33 that match the positioning protrusions 32. The grinding wheel body 1 is composed of the base wheel 30 and the jacket 31, and the jacket 31 can be selected from materials of different hardness according to the grinding material, which is more flexible to use.

[0037] As attached Figure 1 and attached Figure 7 As shown, the middle part of the grinding wheel body 1 is provided with an axial hole 34 for installing the drive shaft, and the end of the grinding wheel body 1 is provided with an inclined platform 35, and the inclined platform 35 is provided with a mounting hole 36 connected to the axial hole 34, and 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 axial hole 34, and the mounting hole 36 is threadedly connected with a locking screw 37 for tightening the drive shaft inserted into the axial hole 34, and the locking screw 37 is a hexagonal screw, a flat screw, or a cross screw. By tightening the locking screw 37, the linkage cooperation between the grinding wheel body 1 and the drive shaft can be realized, the structure is simple and reliable, and the disassembly and assembly are very convenient.

Claims

1. A grinding wheel for quickly changing sandpaper, comprising a grinding wheel body (1) and sandpaper (2) arranged on the grinding wheel body (1); characterized in that: The invention also comprises a clamping assembly (3) and a locking assembly (4); locking cavities (5) are provided at both ends of the grinding wheel body (1); an opening (6) communicating with the locking cavities (5) is provided on the peripheral side of the grinding wheel body (1); the clamping assembly (3) comprises an operating rod (7) arranged at a position of the grinding wheel body (1) corresponding to the locking cavity (5), a pressure wheel (8) mounted on the outer periphery of the operating rod (7) in a linkage manner, and a support sheet (10) hinged to the pressure wheel (8) through a rotating shaft (9); the sandpaper (2) is coated on 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 wheel (8) and the support sheet (10); the locking assembly (4) acts on the clamping assembly (3), so that the pressure wheel (8) and the support sheet (10) clamp the sandpaper (2).

2. The grinding wheel for quickly changing sandpaper according to claim 1, characterized in that: The pressing wheel (8) is provided with a positioning needle (12), and the supporting sheet (10) is provided with a positioning hole (11) for the positioning needle (12) to pass through.

3. The grinding wheel for quickly changing sandpaper according to claim 2, characterized in that: The operating rod (7) is rotatably arranged on the grinding wheel body (1); the locking assembly (4) comprises a spring sheet (13) and an elastic member (14); one end of the elastic member (14) is connected to the grinding wheel body (1); the other end of the elastic member (14) is connected to an end of the support sheet (10) away from the rotating shaft (9), so as to cause the support sheet (10) to have a tendency to rotate in a direction away from the pressure wheel (8); one end of the spring sheet (13) is rotatably connected to the grinding wheel body (1); the other end of the spring sheet (13) is provided with a locking protrusion (15); the support sheet (10) A plurality of locking recesses (16) for cooperating with the locking protrusion (15) are arranged along the length direction on the side away from the pressure wheel (8). Under the action of the elastic member (14), the support sheet (10) makes the locking protrusion (15) on the spring sheet (13) match with the corresponding locking recess (16) on the support sheet (10), and when the locking protrusion (15) matches with a locking recess (16) closest to the rotating shaft (9), the positioning pin (12) is completely separated from the positioning hole (11), and the middle part of the spring sheet (13) is always pressed against the inner wall of the locking cavity (5).

4. The grinding wheel for quickly changing sandpaper according to claim 3 is characterized in that: The grinding wheel body (1) is provided with a first through hole (17), the middle part of the operating rod (7) is inserted into the first through hole (17), the number of the pressure wheels (8) is two, and the pressure wheel (8) is provided with a second through hole (18), the two ends of the operating rod (7) are respectively inserted into the second through holes (18) of the corresponding pressure wheels (8), and the end of the operating rod (7) is interference fit with the second through hole (18) of the corresponding pressure wheel (8).

5. The grinding wheel for quickly changing sandpaper according to claim 4, characterized in that: The operating rod (7) is provided with a hexagonal hole (19) extending therethrough in the axial direction.

6. The grinding wheel for quickly changing sandpaper according to claim 3, characterized in that: The pressing wheel (8) is made of plastic material, and the supporting sheet (10) is made of metal material.

7. The grinding wheel for quickly changing sandpaper according to claim 3, characterized in that: The spring piece (13) is in a U-shaped configuration. Each of the two ends of the spring piece (13) is provided with a curled portion (20). The grinding wheel body (1) is provided with a third through hole (21). A support rod (22) is disposed through the third through hole (21). The cross section of the support rod (22) is in a C-shaped configuration. The curled portions (20) at the two ends of the spring piece (13) are respectively sleeved on the two ends of the support rod (22), and the open end (6) of the support rod (22) is arranged away from the end of the curled portion (20).

8. The grinding wheel for quickly changing sandpaper according to claim 3, characterized in that: The elastic member (14) includes a first tension spring (23) and a second tension spring (24). The spring piece (13) is provided with a first connection hole (25) and a second connection hole (26). A threaded hole (27) is disposed through the grinding wheel body (1). A connection screw (28) is threadedly connected to the threaded hole (27). The first tension spring (23) and the second tension spring (24) are respectively disposed at the two ends of the grinding wheel body (1). One end of the first tension spring (23) is inserted into the first connection hole (25), and the other end of the first tension spring (23) is lapped on the screw rod portion of the connection screw (28), and the screw head of the connection screw (28) axially limits one end of the first tension spring (23) away from the spring piece (13). One end of the second tension spring (24) is inserted into the second connection hole (26), and the other end of the second tension spring (24) is lapped on the screw rod portion of the connection screw (28), and a limit nut (29) for axially limiting one end of the second tension spring (24) away from the spring piece (13) is further threadedly connected to the connection screw (28).

9. The grinding wheel for quickly changing sandpaper 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 a metal material. The outer sleeve (31) is made of a metal or wood material. The outer sleeve (31) is sleeved on the outer periphery of the base wheel (30) and the two are bonded together with glue. A plurality of positioning protrusions (32) are disposed on the outer periphery of the base wheel (30). A plurality of positioning grooves (33) that are engaged with the positioning protrusions (32) are disposed on the inner periphery of the outer sleeve (31).

10. The grinding wheel for quickly changing sandpaper according to claim 1, characterized in that: An axial hole (34) for installing a drive shaft is disposed in the middle of the grinding wheel body (1). An inclined platform (35) is provided at the end of the grinding wheel body (1). An installation hole (36) that is communicated with the axial hole (34) is provided on the inclined platform (35). The central axis of the installation hole (36) is inclined with respect to the central axis of the axial hole (34). A locking screw (37) for tightly pressing the drive shaft inserted into the axial hole (34) is threadedly connected to the installation hole (36).

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