Grinding disc with abrasive paper convenient to replace

Abstract

The invention relates to the technical field of grinding discs, in particular to a grinding disc convenient for abrasive paper replacement, which comprises a grinding machine main body, a lifting plate is arranged in the grinding machine main body, the lower end of the lifting plate is rotatably connected with a grinding disc, the lower end of the lifting plate is fixedly connected with a replacement box, abrasive paper is carried in the replacement box, and the replacement box is flush with the bottom of the grinding disc; the replacement mechanism is located in the replacement box; when the abrasive paper replacement device is used, abrasive paper at the bottom of the grinding disc can be replaced through the replacement mechanism, new abrasive paper is taken out from the interior of the replacement box through the replacement frame, and when the abrasive paper is rotated to the bottom of the grinding disc, the replacement mechanism drives the clamping mechanism to loosen the used abrasive paper; after the used abrasive paper falls off, the replacement frame moves new abrasive paper to the bottom of the grinding disc and is attached to the grinding disc, meanwhile, the clamping mechanism clamps the new abrasive paper, it can be guaranteed that the position of the abrasive paper is accurate during replacement, the abrasive paper can be rapidly replaced, and use is very convenient.

Description

Technical Field

[0001] The invention relates to the technical field of grinding discs, in particular to a grinding disc which is convenient for replacing sandpaper. Background Art

[0002] When using a grinder, the sandpaper needs to be fixed on the grinding disc of the grinder. There are many ways to fix sandpaper on the grinding disc, such as clamping, self-adhesive, magnetic, etc. The clamping method is to place the sandpaper in the appropriate position on the grinding disc, and then clamp it with a device such as a splint or a clamp to prevent the sandpaper from sliding or falling during the grinding process.

[0003] When replacing sandpaper on an existing grinding disc, the used sandpaper needs to be removed first and then new sandpaper needs to be attached. Not only is the replacement method complicated, but the sandpaper and the grinding disc also need to be aligned, which is very troublesome to use. Therefore, we propose a grinding disc that is easy to replace sandpaper. Summary of the invention

[0004] The purpose of the present invention is to provide a grinding disc that is easy to replace sandpaper, so as to solve the problem proposed in the above background technology that the used sandpaper must be removed first and then new sandpaper must be attached. Not only is the replacement method complicated, but the sandpaper and the grinding disc also need to be aligned, which is very troublesome during use.

[0005] To achieve the above object, the present invention provides the following technical solutions: a grinding disc for easy replacement of sandpaper, comprising a grinding machine body, a lifting plate arranged inside the grinding machine body, a grinding disc rotatably connected to the lower end of the lifting plate, a replacement box fixedly connected to the lower end of the lifting plate, sandpaper carried inside the replacement box, and the replacement box is flush with the bottom of the grinding disc;

[0006] A replacement mechanism, the replacement mechanism is located inside the replacement box, and the replacement mechanism can replace the sandpaper inside the replacement box with the sandpaper at the bottom of the grinding disc;

[0007] The clamping mechanism is located at the periphery of the grinding disc, and the clamping mechanism can clamp the sandpaper at the bottom of the grinding disc.

[0008] Among them, the replacement mechanism includes a fixed plate fixedly connected to one end of the replacement box near the grinding disc, the fixed plate is located outside the replacement box, a rotating plate is rotatably connected below the fixed plate, a replacement frame is fixedly connected to one end of the rotating plate near the replacement box, a plurality of blocks are fixedly connected to the inner wall of the replacement box, the blocks are located above the replacement frame, a grabbing piece capable of grabbing the sandpaper inside the replacement box is provided at the upper end of the replacement frame, and a replacement piece for replacing the sandpaper is provided at the end of the replacement frame away from the rotating plate.

[0009] Among them, the grabbing part includes a through groove opened inside the replacement frame, two grabbing holes opened on the upper end of the replacement frame, the grabbing holes are respectively located at both ends of the rotating plate, each grabbing hole is connected to the through groove, a grabbing rod is fixedly connected to the inner wall of the through groove, a grabbing column is rotatably connected to the outer periphery of the grabbing rod, the upper end of the grabbing column is located outside the replacement frame, the upper end of the grabbing column is fixedly connected to the grabbing plate, the grabbing column is located inside the grabbing hole and is rotatably connected to the grabbing hole.

[0010] Among them, the replacement part includes a replacement hole opened at one end of the replacement frame away from the rotating plate, the replacement hole is located on the side of the replacement frame, a replacement rod is fixedly connected to the inner wall of the through groove, a torsion spring is fixedly connected to the outer wall of the replacement rod, a replacement column is fixedly connected to one end of the torsion spring away from the replacement rod, the replacement column is located on the periphery of the replacement rod and is rotatably connected to the replacement rod, and the replacement column is located inside the replacement hole and is rotatably connected to the replacement hole.

[0011] Among them, a rope is fixedly connected to the outer wall of the grabbing column, the rope is wound around the outer periphery of the grabbing column, and one end of the rope away from the grabbing column is fixedly connected to the outer wall of the replacement column.

[0012] Among them, one end of the replacement column away from the through slot is located outside the replacement frame, and a knob is fixedly connected to the outer wall of the replacement column.

[0013] Among them, the clamping mechanism includes a plurality of clamping holes opened at the bottom of the grinding disc, each clamping hole is fixedly connected to the inner wall of the spring, a protrusion is fixedly connected to the end of the spring away from the inner wall of the clamping hole, two support plates are fixedly connected to the outer wall of the grinding disc, a support rod is fixedly connected between the two support plates, and a clamping part capable of clamping sandpaper is provided on the outside of the grinding disc.

[0014] Among them, the clamping part includes a rotating ring rotatably connected to the outer periphery of the support rod, a connecting rod is fixedly connected between the rotating ring and the protrusion, a clamping plate is fixedly connected to the bottom of the rotating ring, a support ring is fixedly connected to the outer wall of the rotating ring, the support ring is located above the clamping plate, and a hoop is rotatably connected inside each support ring.

[0015] Among them, a spring piece is fixedly connected to the outer wall of the support ring, an arc-shaped groove is arranged on the inner wall of the support plate, and the spring piece is located inside the arc-shaped groove and is slidably connected to the arc-shaped groove.

[0016] Among them, a connecting block is fixedly connected to the bottom of the rotating plate, a baffle rod is fixedly connected to the bottom of the connecting block, a torsion spring is fixedly connected to the outer wall of the baffle rod, an end of the torsion spring away from the baffle rod is fixedly connected to a toggle plate, the toggle plate is rotatably connected to the baffle rod, an end of the connecting block away from the grinding disk is fixedly connected to a baffle plate, and the baffle plate abuts against the toggle plate.

[0017] The present invention has at least the following beneficial effects:

[0018] When the present invention is in use, the sandpaper at the bottom of the grinding disc can be replaced by the replacement mechanism, and the new sandpaper is taken out from the replacement box by the replacement frame. When it is rotated to the bottom of the grinding disc, the replacement mechanism drives the clamping mechanism to loosen the used sandpaper. After the used sandpaper falls off, the replacement frame moves the new sandpaper to the bottom of the grinding disc and fits the grinding disc. At the same time, the clamping mechanism clamps the new sandpaper. Not only can the sandpaper be accurately positioned during replacement, but the sandpaper can also be quickly replaced, which is very convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the grinding machine of the present invention;

[0020] Figure 2 This is a schematic diagram of the bottom structure of the grinding disc of the present invention;

[0021] Figure 3 This is a schematic diagram of the cross-sectional structure of the replacement frame of the present invention;

[0022] Figure 4 for Figure 3 Schematic diagram of the enlarged structure of the middle A area;

[0023] Figure 5 This is a schematic diagram of the bottom structure of the replacement box of the present invention;

[0024] Figure 6 for Figure 5 Schematic diagram of the enlarged structure of the middle B area;

[0025] Figure 7 for Figure 5 Schematic diagram of the enlarged structure of the middle C area;

[0026] Figure 8 This is a cross-sectional structural diagram of a replacement column of the present invention;

[0027] Fig. 9 for Figure 8 Schematic diagram of the enlarged structure of the middle D area;

[0028] Fig.10 It is a schematic diagram of the cross-sectional structure of the grinding disc of the present invention;

[0029] Fig.11 for Fig.10 Schematic diagram of the enlarged structure of the middle E area;

[0030] Fig.12 This is a schematic diagram of the arc groove structure of the present invention;

[0031] Fig.13 for Fig.12 Schematic diagram of the enlarged arc groove structure in the middle F area;

[0032] Fig.14 It is a schematic diagram of the cross-sectional structure of the toggle plate of the present invention;

[0033] Fig.15 for Fig.14 Schematic diagram of the enlarged structure of the middle G area.

[0034] In the figure: 1, grinding machine body; 11, lifting plate; 12, replacement box; 2, grinding disc; 3, replacement mechanism; 31, fixed plate; 32, rotating plate; 33, replacement frame; 34, stopper; 35, connecting block; 36, stopper rod; 37, torsion spring 2; 38, toggle plate; 39, stopper; 4, clamping mechanism; 41, clamping hole; 42, spring; 43, bump; 44, support plate; 45, support rod; 5. Grabbing member; 51. Through slot; 52. Grabbing hole; 53. Grabbing rod; 54. Grabbing column; 55. Grabbing plate; 6. Replacement member; 61. Replacement hole; 62. Replacement rod; 63. Torsion spring 1; 64. Replacement column; 65. Rope; 66. Knob; 7. Clamping member; 71. Rotating ring; 72. Connecting rod; 73. Clamping plate; 74. Support ring; 75. Hoop; 76. Shrapnel; 77. Arc groove. DETAILED DESCRIPTION

[0035] 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.

[0036] See also Figure 1-15 The present invention provides a technical solution: a grinding disc for easy replacement of sandpaper, comprising a grinding machine body 1, a lifting plate 11 is arranged inside the grinding machine body 1, a grinding disc 2 is rotatably connected to the lower end of the lifting plate 11, a replacement box 12 is fixedly connected to the lower end of the lifting plate 11, sandpaper is carried inside the replacement box 12, and the replacement box 12 is flush with the bottom of the grinding disc 2;

[0037] A replacement mechanism 3, the replacement mechanism 3 is located inside the replacement box 12, and the replacement mechanism 3 can replace the sandpaper inside the replacement box 12 with the sandpaper at the bottom of the grinding disc 2;

[0038] The clamping mechanism 4 is located at the periphery of the grinding disc 2, and the clamping mechanism 4 can clamp the sandpaper at the bottom of the grinding disc 2;

[0039] When the present invention is in use, the sandpaper at the bottom of the grinding disc 2 can be replaced by the replacement mechanism 3, and the new sandpaper can be taken out from the replacement box 12 by the replacement frame 33. When it rotates to the bottom of the grinding disc 2, the replacement mechanism 3 drives the clamping mechanism 4 to loosen the used sandpaper. After the used sandpaper falls off, the replacement frame 33 moves the new sandpaper to the bottom of the grinding disc 2 and fits the grinding disc 2. At the same time, the clamping mechanism 4 clamps the new sandpaper. Not only can the sandpaper be accurately positioned during replacement, but the sandpaper can also be quickly replaced, which is very convenient to use.

[0040] The replacement mechanism 3 includes a fixed plate 31 fixedly connected to one end of the replacement box 12 near the grinding disc 2, the fixed plate 31 is located outside the replacement box 12, a rotating plate 32 is rotatably connected below the fixed plate 31, a replacement frame 33 is fixedly connected to one end of the rotating plate 32 near the replacement box 12, a plurality of stoppers 34 are fixedly connected to the inner wall of the replacement box 12, the stoppers 34 are located above the replacement frame 33, a grabbing member 5 capable of grabbing the sandpaper inside the replacement box 12 is provided at the upper end of the replacement frame 33, and a replacement member 6 for replacing the sandpaper is provided at one end of the replacement frame 33 away from the rotating plate 32;

[0041] The grabbing member 5 includes a through slot 51 provided inside the replacement frame 33, two grabbing holes 52 provided at the upper end of the replacement frame 33, the grabbing holes 52 are respectively located at the two ends of the rotating plate 32, each grabbing hole 52 is connected to the through slot 51, a grabbing rod 53 is fixedly connected to the inner wall of the through slot 51, a grabbing column 54 is rotatably connected to the outer periphery of the grabbing rod 53, the upper end of the grabbing column 54 is located outside the replacement frame 33, the upper end of the grabbing column 54 is fixedly connected to a grabbing plate 55, the grabbing column 54 is located inside the grabbing hole 52 and is rotatably connected to the grabbing hole 52;

[0042] The replacement part 6 includes a replacement hole 61 opened at one end of the replacement frame 33 away from the rotating plate 32, the replacement hole 61 is located on the side of the replacement frame 33, the inner wall of the through groove 51 is fixedly connected with a replacement rod 62, the outer wall of the replacement rod 62 is fixedly connected with a torsion spring 1 63, the end of the torsion spring 1 63 away from the replacement rod 62 is fixedly connected with a replacement column 64, the replacement column 64 is located on the periphery of the replacement rod 62 and is rotatably connected to the replacement rod 62, and the replacement column 64 is located inside the replacement hole 61 and is rotatably connected to the replacement hole 61.

[0043] When the sandpaper needs to be replaced, since the end of the replacement column 64 away from the through slot 51 is located outside the replacement frame 33, the outer wall of the replacement column 64 is fixedly connected to a knob 66. When the knob 66 ​​is rotated, the knob 66 ​​drives the replacement column 64 to rotate around the replacement rod 62. At this time, the torsion spring 1 63 stores force. Since the outer wall of the grabbing column 54 is fixedly connected to a rope 65, the rope 65 is wound around the periphery of the grabbing column 54, and the end of the rope 65 away from the grabbing column 54 is fixedly connected to the outer wall of the replacement column 64. When the replacement column 64 rotates, the rope 65 is pulled. At this time, the replacement column 64 is wound around the rope 65, and the rope 65 is located in the through slot 51. The grabbing column 54 slides in the groove 51 and pulls the grabbing column 54, which rotates around the grabbing rod 53 inside the grabbing hole 52, and the grabbing plate 55 located at the end of the grabbing column 54 rotates half a circle. The grabbing plate 55 clamps the sandpaper inside the replacement box 12, and when the replacement frame 33 is driven to rotate around the rotation axis of the rotating plate 32, the replacement frame 33 drives the new sandpaper to rotate. Since the rotation axis of the rotating plate 32 is equidistant from the grinding disk 2 and the replacement box 12, when the replacement frame 33 rotates to the bottom of the grinding disk 2, the new sandpaper corresponds to the position of the grinding disk 2, which is convenient for determining the position of the sandpaper and facilitating and quickly replacing the sandpaper.

[0044] After the grabbing plate 55 grabs the sandpaper, when the replacement frame 33 is rotated, the sandpaper at the bottom passes over the stopper 34 and rotates with the replacement frame 33. The sandpaper inside the replacement box 12 continues to move downward due to its own gravity, making it convenient to grab the sandpaper next time. The stopper 34 can prevent the sandpaper inside the replacement box 12 from falling after the replacement frame 33 rotates.

[0045] The clamping mechanism 4 includes a plurality of clamping holes 41 formed at the bottom of the grinding disc 2, a spring 42 is fixedly connected to the inner wall of each clamping hole 41, a bump 43 is fixedly connected to one end of the spring 42 away from the inner wall of the clamping hole 41, two support plates 44 are fixedly connected to the outer wall of the grinding disc 2, a support rod 45 is fixedly connected between the two support plates 44, and a clamping member 7 capable of clamping sandpaper is provided outside the grinding disc 2;

[0046] The clamping member 7 includes a rotating ring 71 rotatably connected to the outer periphery of the support rod 45, a connecting rod 72 is fixedly connected between the rotating ring 71 and the protrusion 43, a clamping plate 73 is fixedly connected to the bottom of the rotating ring 71, a supporting ring 74 is fixedly connected to the outer wall of the rotating ring 71, and the supporting ring 74 is located above the clamping plate 73, each supporting ring 74 is rotatably connected to a hoop 75 inside, and a spring piece 76 is fixedly connected to the outer wall of the supporting ring 74, and an arc groove 77 is provided on the inner wall of the supporting plate 44, and the spring piece 76 is located inside the arc groove 77 and is slidably connected to the arc groove 77;

[0047] A connecting block 35 is fixedly connected to the bottom of the rotating plate 32, a baffle rod 36 is fixedly connected to the bottom of the connecting block 35, a torsion spring 37 is fixedly connected to the outer wall of the baffle rod 36, an end of the torsion spring 37 away from the baffle rod 36 is fixedly connected to a toggle plate 38, the toggle plate 38 is rotatably connected to the baffle rod 36, a baffle plate 39 is fixedly connected to the end of the connecting block 35 away from the grinding disc 2, and the baffle plate 39 abuts against the toggle plate 38.

[0048] When the replacement frame 33 is rotated, the connecting block 35 located at the bottom of the rotating plate 32 rotates with the rotating plate 32. When the replacement frame 33 is rotated ninety degrees, the toggle plate 38 abuts against the bottom of the ring hoop 75, and the rotating plate 32 continues to rotate. Since the toggle plate 38 abuts against the baffle plate 39, the rotating plate 32 drives the ring hoop 75 to move upward through the toggle plate 38. At this time, the ring hoop 75 drives the rotating ring 71 to rotate through the support ring 74. The connecting rod 72 located on one side of the rotating ring 71 drives the protrusion 43 located in the clamping hole 41 to move downward. At this time, the protrusion 43 extends out of the clamping hole 41. At the same time, the spring 42 is stretched, and the clamping plate 73 located under the rotating ring 71 is opened due to the rotation of the rotating ring 71. The sandpaper between the clamping plate 73 and the grinding disc 2 falls off, which is convenient for the new sandpaper to fit the grinding disc 2.

[0049] When the support ring 74 rotates upward, the spring piece 76 located on one side of the support ring 74 slides into the arc groove 77 provided on the inner wall of the support plate 44, and the spring piece 76 abuts and is fixed against the inner wall of the arc groove 77. At this time, the protrusion 43 extends out of the bottom of the grinding disc 2 and is fixed. The protrusion 43 can not only push out the used sandpaper, but also when the new sandpaper is attached to the bottom of the grinding disc 2, the protrusion 43 can be pushed to drive the clamping plate 73 to clamp the sandpaper, which is very convenient to use.

[0050] When the replacement frame 33 continues to rotate, the sandpaper located in the center of the replacement frame 33 fits the grinding disc 2, and the replacement frame 33 abuts and pushes the protrusion 43. At this time, the protrusion 43 slides into the clamping hole 41, and the spring 76 slides out of the arc groove 77. When the spring 42 is reset, it pulls the protrusion 43 to slide in the clamping hole 41. When the protrusion 43 slides in the reverse direction, the protrusion 43 drives the rotating ring 71 to rotate in the reverse direction through the connecting rod 72. At this time, the rotating ring 71 drives the clamping plate 73 clamps the sandpaper, at which time the sandpaper is fixed by the clamping plate 73, and finally the replacement frame 33 is rotated in the opposite direction, and the toggle plate 38 located at one end of the rotating plate 32 rotates in the opposite direction. When the toggle plate 38 toggles the ring hoop 75 again, the toggle plate 38 rotates around the baffle rod 36. At this time, the torsion spring 2 37 accumulates force, and when the toggle plate 38 passes over the ring hoop 75, the torsion spring 2 37 is reset to drive the toggle plate 38 to rotate in the opposite direction until the toggle plate 38 abuts against the baffle plate 39, which is convenient for the next toggle of the ring hoop 75.

[0051] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0052] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A grinding disc for facilitating replacement of sandpaper, comprising: A grinding machine body (1), wherein a lifting plate (11) is arranged inside the grinding machine body (1), a grinding disc (2) is rotatably connected to the lower end of the lifting plate (11), a replacement box (12) is fixedly connected to the lower end of the lifting plate (11), sandpaper is carried inside the replacement box (12), and the replacement box (12) is flush with the bottom of the grinding disc (2); It is characterized by: also including: A replacement mechanism (3), the replacement mechanism (3) being located inside the replacement box (12), and the replacement mechanism (3) being capable of replacing the sandpaper inside the replacement box (12) with the sandpaper at the bottom of the grinding disc (2); A clamping mechanism (4), wherein the clamping mechanism (4) is located at the periphery of the grinding disc (2), and the clamping mechanism (4) is capable of clamping the sandpaper at the bottom of the grinding disc (2).

2. The grinding disc for easy replacement of sandpaper according to claim 1, characterized in that: The replacement mechanism (3) comprises a fixed plate (31) fixedly connected to one end of the replacement box (12) close to the grinding disc (2); the fixed plate (31) is located outside the replacement box (12); a rotating plate (32) is rotatably connected below the fixed plate (31); a replacement frame (33) is fixedly connected to one end of the rotating plate (32) close to the replacement box (12); a plurality of stoppers (34) are fixedly connected to the inner wall of the replacement box (12); the stoppers (34) are located above the replacement frame (33); a gripping member (5) capable of gripping sandpaper inside the replacement box (12) is provided at the upper end of the replacement frame (33); and a replacement member (6) for replacing sandpaper is provided at one end of the replacement frame (33) away from the rotating plate (32).

3. The grinding disc for easy replacement of sandpaper according to claim 2, characterized in that: The grabbing member (5) comprises a through slot (51) provided inside the replacement frame (33); two grabbing holes (52) are provided at the upper end of the replacement frame (33); the grabbing holes (52) are respectively located at the two ends of the rotating plate (32); each of the grabbing holes (52) is communicated with the through slot (51); a grabbing rod (53) is fixedly connected to the inner wall of the through slot (51); a grabbing column (54) is rotatably connected to the outer periphery of the grabbing rod (53); the upper end of the grabbing column (54) is located outside the replacement frame (33); the upper end of the grabbing column (54) is fixedly connected to a grabbing plate (55); the grabbing column (54) is located inside the grabbing hole (52) and is rotatably connected to the grabbing hole (52).

4. The grinding disc for easy replacement of sandpaper according to claim 3, characterized in that: The replacement part (6) comprises a replacement hole (61) opened at one end of the replacement frame (33) away from the rotating plate (32); the replacement hole (61) is located on the side of the replacement frame (33); a replacement rod (62) is fixedly connected to the inner wall of the through slot (51); a torsion spring (63) is fixedly connected to the outer wall of the replacement rod (62); a replacement column (64) is fixedly connected to one end of the torsion spring (63) away from the replacement rod (62); the replacement column (64) is located outside the replacement rod (62) and is rotatably connected to the replacement rod (62); the replacement column (64) is located inside the replacement hole (61) and is rotatably connected to the replacement hole (61).

5. The grinding disc for easy replacement of sandpaper according to claim 4, characterized in that: The outer wall of the grabbing column (54) is fixedly connected with a rope (65), the rope (65) is wound around the outer periphery of the grabbing column (54), and one end of the rope (65) away from the grabbing column (54) is fixedly connected to the outer wall of the replacement column (64).

6. The grinding disc for easy replacement of sandpaper according to claim 4, characterized in that: One end of the replacement column (64) away from the through slot (51) is located outside the replacement frame (33), and a knob (66) is fixedly connected to the outer wall of the replacement column (64).

7. The grinding disc for easy replacement of sandpaper according to claim 1, characterized in that: The clamping mechanism (4) comprises a plurality of clamping holes (41) formed at the bottom of the grinding disc (2); a spring (42) is fixedly connected to the inner wall of each clamping hole (41); a protrusion (43) is fixedly connected to one end of the spring (42) away from the inner wall of the clamping hole (41); two support plates (44) are fixedly connected to the outer wall of the grinding disc (2); a support rod (45) is fixedly connected between the two support plates (44); and a clamping member (7) capable of clamping sandpaper is provided on the outside of the grinding disc (2).

8. The grinding disc for easy replacement of sandpaper according to claim 7, characterized in that: The clamping member (7) comprises a rotating ring (71) rotatably connected to the periphery of a support rod (45), a connecting rod (72) fixedly connected between the rotating ring (71) and the protrusion (43), a clamping plate (73) fixedly connected to the bottom of the rotating ring (71), a supporting ring (74) fixedly connected to the outer wall of the rotating ring (71), the supporting ring (74) being located above the clamping plate (73), and a hoop (75) rotatably connected inside each of the supporting rings (74).

9. The grinding disc for easy replacement of sandpaper according to claim 8, characterized in that: The outer wall of the support ring (74) is fixedly connected with a spring piece (76), the inner wall of the support plate (44) is provided with an arc-shaped groove (77), and the spring piece (76) is located inside the arc-shaped groove (77) and is slidably connected with the arc-shaped groove (77).

10. The grinding disc for easy replacement of sandpaper according to claim 2, characterized in that: The bottom of the rotating plate (32) is fixedly connected to a connecting block (35), the bottom of the connecting block (35) is fixedly connected to a blocking rod (36), the outer wall of the blocking rod (36) is fixedly connected to a second torsion spring (37), the end of the second torsion spring (37) away from the blocking rod (36) is fixedly connected to a toggle plate (38), the toggle plate (38) is rotatably connected to the blocking rod (36), the end of the connecting block (35) away from the grinding disc (2) is fixedly connected to a baffle plate (39), and the baffle plate (39) abuts against the toggle plate (38).

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