A manual grinding tool

Abstract

The present invention provides a manual grinding tool, belonging to the technical field of grinding tools. It includes a fixed seat and a fixed rod, and a cover plate detachably mounted on the fixed seat, the top wall of the fixed seat is equidistantly provided with a plurality of slide grooves and a plurality of first mounting grooves, a plurality of first mounting grooves are each provided with a detachable sandpaper sheet, a plurality of slide grooves are each provided with a slider for limited sliding movement, an expansion component is installed at the inner end of the slider, and is used to enable the slider to keep squeezing the sandpaper sheet. The present invention sets an expansion component, and when adjusting the second roller, the worn sandpaper belt can be moved, and the position of the sandpaper belt can be adjusted without replacing the entire belt, thereby solving the problem that the traditional integrated grinding head needs to be replaced when it is worn to a certain extent, resulting in failure to fully utilize the grinding head and waste of materials; and when adjusting the grinding range of the fixed seat, the second roller can also compensate for the length of the sandpaper belt, thereby further improving the stability of the sandpaper belt adjustment.

Description

Technical Field

[0001] The invention relates to the technical field of grinding tools, in particular to a manual grinding tool. Background Art

[0002] In modern industrial manufacturing, the machining accuracy of parts is crucial to the overall performance of the product. Whether it is the key engine components in the aerospace field or the transmission housing in the automotive industry, high-precision inner holes, planes and other surface treatments are required. The aperture accuracy and surface quality directly affect the fit between the blades and the holes. If the accuracy is insufficient, vibration may occur under high-speed operation, seriously affecting safety.

[0003] For these parts with high precision requirements, manual grinding tools came into being and became a processing method that is supplementary or used under specific conditions; for example, although traditional processing methods such as turning, milling and boring can complete dimensional processing to a certain extent, they are limited in surface roughness and micro-geometry. Especially when processing some complex-shaped inner cavities, turning and milling tools are not easy to reach all areas that need to be processed, which will lead to inconsistent surface quality. Manual grinding tools can perform fine processing on these preliminarily processed surfaces, effectively remove processing traces, and thus improve the overall quality. However, since the grinding head is an integrated structure, once it is worn to a certain extent, the entire grinding head needs to be replaced, which not only fails to fully utilize the grinding head, but also leads to material waste; and when grinding holes, there are certain limitations for grinding holes with fixed-size grinding heads. For example, when the aperture is much larger than the grinding range of the grinding head, grinding requires a handheld electric handpiece to control the grinding head to repeatedly move its position in the hole, which will affect the processing efficiency. Therefore, the present application provides a manual grinding tool to meet the needs. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a manual grinding tool to solve the problem that the existing grinding head needs to be replaced when it is worn to a certain extent, which not only fails to fully utilize the grinding head, but also leads to waste of materials; and when grinding holes, there are certain limitations for grinding holes with a fixed-size grinding head, thereby affecting the processing efficiency.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A manual grinding tool comprises a fixing seat and a fixing rod, the fixing rod can be fixed to an external electric handpiece, the fixing method of the fixing rod and the external electric handpiece is a prior art structure, which will not be described in detail here, as well as a cover plate detachably mounted on the fixing seat, the top wall of the fixing seat is equidistantly provided with a plurality of slide grooves and a plurality of first mounting grooves, a plurality of first mounting grooves are each installed with a detachable sandpaper piece, a plurality of slide grooves are each provided with a slider for limited sliding movement, a spring is installed at the inner end of the slider for keeping the slider squeezing the sandpaper piece, one end of the spring is in contact with the slider, and the other end of the spring is in contact with the inner wall of the slide groove, both ends of the sandpaper piece are fixed in the first mounting groove by a top screw, and the slider is located at the inner end of the fixed sandpaper piece, because the slider is limited to slide in the slide groove, and the spring applies pressure to the slider in the slide groove, so that the slider continues to be squeezed outward, and the sandpaper pieces fixed at both ends can keep being ejected outward.

[0007] It also includes an expansion component, which includes a fixed ring, a plurality of reset plates fixedly connected to the circumferential side surface of the fixed ring, and a plurality of slots, and the ends of the reset plates away from the fixed ring are respectively fixedly connected to a mounting frame and a plurality of support plates, and the ends of the support plates away from the reset plates are abutment ends; a slidable first fixed plate is inserted into each of the slots, a second fixed plate is fixedly connected to both ends of the opening of the first fixed plate, the top wall of the first fixed plate is a slope structure, and the second fixed plate and the support plate are fixed in a detachable manner; a rotating rod is rotatably connected in the mounting frame, a second roller is fixedly connected to the rotating rod, the top end of the rotating rod passes through the mounting frame to extend outward, and is fixedly connected to a second handle.

[0008] The surface of the fixed seat is also provided with an annular groove, a receiving groove and a plurality of second mounting grooves. The plurality of first mounting grooves are interconnected, and the plurality of first mounting grooves are connected with the plurality of second mounting grooves. A fixing tube is threadedly connected to the annular groove. The top end of the fixing tube gradually narrows toward the bottom end and forms a conical structure. A fixing plate is fixedly connected to the top end of the fixing tube. A through hole corresponding to the size of the fixing rod is provided on the top wall of the fixing plate. A first handle is fixedly connected to the outer peripheral side wall of the fixing plate. By arranging the fixing tube and the annular groove, two second mounting grooves are grouped together and are respectively located at both ends of the slide groove. The second mounting groove and the support sheet are both L-shaped structures.

[0009] The outer ends of the plurality of sliders are rotatably connected to a first roller, the plurality of sandpaper sheets are connected to each other to form a sandpaper belt, and the sandpaper belt and the plurality of the first rollers are tensioned together, the outer peripheral side walls of the first roller and the plurality of the second rollers are fixedly connected to a plurality of convex strips, the plurality of convex strips are arranged around the first roller as the center, and a plurality of gaps are formed between the plurality of convex strips.

[0010] A fixing tube is threadedly connected to the annular groove, the top of the fixing tube gradually narrows toward the bottom to form a tapered structure, and a fixing plate is fixedly connected to the top of the fixing tube. A through hole corresponding to the size of the fixing rod is provided on the top wall of the fixing plate, and a first handle is fixedly connected to the outer peripheral side wall of the fixing plate.

[0011] Several of the support plates are grouped in two and are respectively located on both sides of the slider, the inner wall of the sandpaper plate is in contact with the outer wall of the support plate, and several of the reset plates are all wavy structures, the connection between the reset plate and the support plate is a plane structure, and the plane structure is fixedly connected to the inner end of the slide groove.

[0012] Compared with the prior art, the present invention has at least the following beneficial effects:

[0013] In the above scheme, by setting an expansion component, the worn sandpaper belt can be moved when adjusting the second roller. The position of the sandpaper belt can be adjusted without replacing the entire belt, thereby solving the problem that the traditional integrated grinding head needs to be replaced when it is worn to a certain extent, resulting in failure to fully utilize the grinding head and waste of materials; and when the sandpaper belt is tensioned and connected on multiple first rollers, the second roller also contacts the sandpaper belt. When adjusting the grinding range of the fixed seat, the extended length of the multiple sliders will not affect the tensioning of the sandpaper belt, and the second roller can also compensate for the length of the sandpaper belt, thereby further improving the adjustment stability of the sandpaper belt.

[0014] By setting a fixed tube and adjusting the position of the fixed tube with the first handle, multiple sliders are extended outward at the same time, and the multiple sliders drive the sandpaper belt to expand, so as to achieve the purpose of adjusting the grinding range. Therefore, the grinding range is adjusted to be close to the aperture size required for grinding, and the contact grinding area can be increased during grinding, thereby reducing processing limitations and improving processing efficiency.

[0015] By setting a support plate in the expansion component, the rotation of the first roller can be limited to prevent the sandpaper belt from following the rotation during the grinding process; and the reset plate and the sandpaper belt are in close contact, which can improve the friction and avoid the problem of the sandpaper belt following the movement during the grinding process. On the other hand, it can protect the edge of the sandpaper belt and prevent the problem of tearing caused by grinding the edge of the sandpaper belt during the grinding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, further serve to explain the principles of the invention and to enable those skilled in the relevant art to make and use the invention.

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the manual grinding tool in Example 1;

[0018] Figure 2 for Figure 1 Schematic diagram of the three-dimensional structure of the middle fixed seat;

[0019] Figure 3 for Figure 2 The enlarged structural diagram of part A in the middle;

[0020] Figure 4 It is a schematic diagram of the three-dimensional structure of the manual grinding tool in the second embodiment;

[0021] Figure 5 for Figure 4 Schematic diagram of the three-dimensional structure of the middle fixed seat;

[0022] Figure 6 for Figure 4 A schematic diagram of a second perspective stereoscopic structure;

[0023] Figure 7 is a schematic diagram of the annular groove;

[0024] Figure 8 It is a schematic diagram of the three-dimensional structure of the fixed tube;

[0025] Fig. 9 It is a schematic diagram of the cross-sectional structure of a fixed pipe;

[0026] Fig.10 It is a schematic diagram of the three-dimensional structure of the fixed ring;

[0027] Fig.11 It is a schematic diagram of the three-dimensional structure of the support sheet;

[0028] Fig.12 for Figure 6 The enlarged structural diagram of part B in the middle;

[0029] Fig.13 is a schematic diagram of the three-dimensional structure of the first roller;

[0030] Fig.14 for Fig. 9 The enlarged structural diagram of part E in the middle;

[0031] Fig.15 for Fig.10 The enlarged structural diagram of the middle F part;

[0032] Fig.16 is a schematic diagram of the three-dimensional structure of the second roller;

[0033] Fig.17 for Fig.12 Schematic diagram of the enlarged structure of part C in the middle.

[0034] Reference numerals:

[0035] 1. Fixed seat; 2. Fixed rod; 3. Cover plate; 4. Slide groove; 5. Slider; 6. Expansion component; 7. First mounting groove; 8. Sandpaper; 9. Fixed tube; 10. Fixed plate; 11. First handle; 12. Through hole; 13. Inclined structure; 14. Annular groove; 15. Accommodating groove; 16. Second mounting groove; 17. First roller; 18. Raised strip; 19. Gap; 20. Fixed ring; 21. Reset plate; 22. Slot; 23. Support plate; 24. Abutment end; 25. Mounting frame; 26. Rotating rod; 27. Second roller; 28. Second handle; 29. ​​First fixed plate; 30. Second fixed plate; 31. Plane structure.

[0036] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments. DETAILED DESCRIPTION

[0037] A manual grinding tool provided by the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternatives to implement some known technologies; and the accompanying drawings are only for more specific description of the embodiments, and are not intended to specifically limit the present invention.

[0038] It should be noted that the references to "one embodiment", "embodiment", "exemplary embodiments", "some embodiments" and the like in the specification indicate that the embodiments described may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, when a specific feature, structure or characteristic is described in conjunction with an embodiment, it should be within the knowledge of a person skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments (whether or not explicitly described).

[0039] In general, a term can be understood, at least in part, from its use in context. For example, depending, at least in part, on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending, at least in part, on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0040] It will be understood that the meanings of “on,” “over,” and “above” in the present invention should be interpreted in the broadest manner, so that “on” not only means “directly on” something, but also includes the meaning of being “on” something with intervening features or layers therebetween, and “on” or “over” not only means “on” or “above” something, but also includes the meaning of being “on” or “above” something with no intervening features or layers therebetween.

[0041] Additionally, spatially relative terms such as "under," "beneath," "lower," "above," "upper," and the like may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as shown in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein may be similarly interpreted accordingly.

[0042] Embodiment 1

[0043] like Figures 1 to 3 As shown, an embodiment of the present invention provides a manual grinding tool, including a fixing seat 1 and a fixing rod 2, the fixing rod 2 can be fixed to an external electric handpiece, the fixing method of the fixing rod 2 and the external electric handpiece is a prior art structure, which will not be described in detail here, and a cover plate 3 detachably mounted on the fixing seat 1, a plurality of slide grooves 4 and a plurality of first mounting grooves 7 are equidistantly provided on the top wall of the fixing seat 1, a plurality of first mounting grooves 7 are each provided with a detachable sandpaper sheet 8, a plurality of slide grooves 4 are each provided with a sliding block 5 for limiting sliding movement, a spring is installed at the inner end of the sliding block 5 for keeping the sliding block 5 pressing the sandpaper sheet 8, one end of the spring is in contact with the sliding block 5, and the spring The other end is in contact with the inner wall of the slide groove 4. Both ends of the sandpaper piece 8 are fixed in the first mounting groove 7 by means of a top screw, and the slider 5 is located at the inner end of the fixed sandpaper piece 8. Since the slider 5 is limited in sliding in the slide groove 4 and the spring applies pressure to the slider 5 in the slide groove 4, the slider 5 is continuously squeezed outward. Therefore, the sandpaper pieces 8 fixed at both ends can maintain the state of being pushed outward. When working, start the electric handpiece to rotate the fixing seat 1 to start the grinding operation. When the sandpaper piece 8 is worn, you can first loosen the top screw, then move the sandpaper piece 8 to a suitable position, and finally re-tighten the top screw to fix it, and the sandpaper piece can be replaced.

[0044] Embodiment 2

[0045] like Figures 3 to 17As shown, the components identical or corresponding to those in the first embodiment are marked with the corresponding reference numerals in the first embodiment. For the sake of simplicity, only the differences from the first embodiment are described below. The second embodiment differs from the first embodiment in that:

[0046] It also includes an expansion component 6, which replaces the spring in the first embodiment. The expansion component 6 includes a fixed ring 20, and a plurality of reset sheets 21 are fixedly connected to the side surface of the fixed ring 20. The reset sheets 21 replace the spring, and a plurality of slots 22 are opened. The ends of the reset sheets 21 away from the fixed ring 20 are respectively fixedly connected to the mounting frame 25 and the plurality of support sheets 23. There are four reset sheets 21, three of which are arranged equidistantly to form a triangular structure, and the three reset sheets 21 are all provided with support sheets 23; the mounting frame 25 is arranged on another reset sheet 21, and the end of the support sheet 23 away from the reset sheet 21 is the abutment end 24; a plurality of slots 22 are all inserted with a slidable first fixed sheet 29, and both ends of the opening of the first fixed sheet 29 are fixedly connected with a second fixed sheet 30, wherein, The first fixing plate 29 and the second fixing plate 30 are an integral hard structure, the top wall of the first fixing plate 29 is a slope structure 13, and the second fixing plate 30 and the support plate 23 are fixed in a detachable manner; a rotating rod 26 is rotatably connected inside the mounting frame 25, and a second roller 27 is fixedly connected to the rotating rod 26. The top end of the rotating rod 26 extends outward through the mounting frame 25 and is fixedly connected to a second handle 28; the outer ends of the plurality of sliders 5 are rotatably connected to the first roller 17, and the outer peripheral side walls of the first roller 17 and the plurality of second rollers 27 are fixedly connected to a plurality of convex strips 18, and the plurality of convex strips 18 are arranged around the first roller 17 as the center, and a plurality of gaps 19 are formed between the plurality of convex strips 18, and the plurality of sandpaper sheets 8 are connected to each other to form a sandpaper belt, and the sandpaper belt and the plurality of first rollers 17 are tensioned together.

[0047] like Figures 7 to 17As shown, the surface of the fixing seat 1 is also provided with an annular groove 14, a receiving groove 15 and a plurality of second mounting grooves 16, the plurality of first mounting grooves 7 are connected to each other, and the plurality of first mounting grooves 7 are connected to the plurality of second mounting grooves 16, the annular groove 14 is internally threadedly connected with a fixing tube 9, the top end of the fixing tube 9 gradually narrows toward the bottom end and forms a tapered structure, and the top end of the fixing tube 9 is fixedly connected with a fixing plate 10, the top wall of the fixing plate 10 is provided with a through hole 12 adapted to the size of the fixing rod 2, and the outer peripheral side wall of the fixing plate 10 is fixedly connected with a first handle 11, by arranging the fixing tube 9 and the annular groove 14, the second mounting grooves 16 are grouped into two, and are respectively located at both ends of the slide groove 4, and the second mounting groove 16 and the supporting sheet 23 are both L-shaped structures; when in use, the fixing tube 9 in the annular groove 14 can be rotated by the first handle 11 to move it, and since the fixing tube 9 is a tapered structure, when the fixing tube 9 gradually moves downward, the first fixing sheet 29 can be gradually squeezed outward, on the contrary, when the fixing tube 9 moves upward When the first fixing piece 29 is reset, the first fixing piece 29 slides in the slot 22 during the downward movement of the fixing tube 9. During the sliding movement, the second fixing piece 30 at the outer end of the first fixing piece 29 can drive the supporting piece 23 to move. Since the supporting piece 23 is an L-shaped elastic piece, the supporting piece 23 will be deformed when moving in the L-shaped second mounting groove 16. During the deformation process, it will be limited by the L-shaped second mounting groove 16, so that the abutting end 24 at the outer end of the supporting piece 23 extends outward and is inserted into the gap 19, thereby limiting the rotation of the first roller 17. The advantage of such a setting is that, on the one hand, since the plurality of first rollers 17 are limited by the first abutting end 24 and cannot rotate, the problem of the sandpaper belt following the rotation during the grinding process is avoided. On the other hand, a plurality of convex strips 18 are arranged on the surface of the first roller 17. The convex strips 18 are rubber strips, which can increase the friction between the sandpaper belt and the first roller 17, thereby further avoiding the problem of the sandpaper belt following the rotation, and also facilitate the adjustment of the sandpaper belt transmission on the plurality of first rollers 17.

[0048] like Figures 6 to 16 As shown, the reset plate 21 and the support plate 23 are an integrated elastic structure, and the first fixed plate 29 and the reset plate 21 are fixed. When the first fixed plate 29 slides outward, it will drive the reset plate 21 to move outward. The inner end of the slider 5 is fixed to the reset plate 21. Therefore, when the reset plate 21 moves outward, it will also drive the slider 5 to move outward. Multiple sliders 5 extend outward at the same time, thereby achieving the purpose of adjusting the grinding range of the fixed seat 1, so as to better adapt to the grinding operation. In addition, the inner end of the first fixed plate 29 is squeezed by the fixed tube 9, and the slider 5 will not loosen during the grinding process to affect the grinding. Therefore, by adjusting the grinding range to be close to the aperture size required for grinding, the contact grinding area can be increased during grinding, thereby reducing the processing limitations and improving the processing efficiency.

[0049] In addition, since a second roller 27 is provided on one of the reset sheets 21, the reset sheet 21 can keep the second roller 27 in a preset position. When the sandpaper belt is tensioned and connected to the plurality of first rollers 17, the second roller 27 also contacts the sandpaper belt. The advantage of such a setting is that when the grinding range of the fixed seat 1 is adjusted, the extension length of the plurality of sliders 5 will not affect the tension of the sandpaper belt. The second roller 27 can compensate for the length of the sandpaper belt so that it always fits the second roller 27 and the plurality of first rollers 17. Moreover, the reset sheet 21 and the sandpaper belt fit in contact, which can improve the friction, and further On the one hand, it can avoid the problem of the sandpaper belt following the movement during the grinding process, and on the other hand, it can protect the edge of the sandpaper belt and prevent the problem of the edge of the sandpaper belt being easily torn due to grinding during the grinding process. When the sandpaper belt is worn to a certain extent and needs to be replaced, the first handle 11 should be used to adjust the position of the fixed tube 9 to move it upward, and the structures such as the sliders 5 should be reset, and the abutment end 24 is not in the gap 19. Then, the second handle 28 is used to rotate the second roller 27. The rotation of the second roller will drive the sandpaper belt to move to a new position. After the position adjustment of the sandpaper belt is completed, the grinding operation can be continued.

[0050] like Fig.11 , Fig.12 As shown, several of the reset sheets 21 are of wavy structure, and the connection between the reset sheet 21 and the support sheet 23 is a plane structure 31, and the plane structure 31 is fixedly connected to the inner end of the slide groove 4. Since the reset sheet 21 is an elastic sheet with a wavy structure, the reset sheet 21 is deformed and compressed after being squeezed, and resets after being released from the squeezing. By setting the connection between the reset sheet 21 and the support sheet 23 as the plane structure 31, the contact ability between the two can be improved, thereby improving the stability when adjusting the position of the slider 5.

[0051] like Fig.10 , Fig.17 As shown, two of the support sheets 23 are grouped together and are respectively located on both sides of the slider 5. The inner wall of the sandpaper sheet 8 is in contact with the outer wall of the support sheet 23. Since the support sheets 23 are installed on both sides of the slider 5, when the outer end abutment ends 24 of the two support sheets 23 are inserted into the gap 19, they can effectively limit the two sides of the first roller 17 at the outer end of the slider 5, thereby further avoiding the problem of the first roller 17 rotating during operation.

[0052] The working principle of the technical solution provided by the present invention is as follows: before use, the fixing rod 2 on the fixing seat 1 is fixed to the external electric handpiece, and the electric handpiece is started to start the grinding operation.

[0053] When adjusting the grinding range, the fixing tube 9 in the annular groove 14 can be rotated by the first handle 11 to move it downward, so that the reset sheet 21 drives the slider 5 to move outward, and multiple sliders 5 extend outward at the same time, so as to adjust the grinding range of the fixing seat 1, so as to better adapt to the grinding operation; at the same time, the abutting end 24 at the outer end of the supporting sheet 23 is inserted into the gap 19 to limit the rotation of the first roller 17, so as to avoid the sandpaper belt from rotating with it during the grinding process; and the reset sheet 21 and the sandpaper belt are in close contact, which can improve the friction and further avoid the problem of the sandpaper belt following the movement during the grinding process. On the other hand, it can protect the edge of the sandpaper belt and prevent the edge of the sandpaper belt from being easily torn due to grinding during the grinding process.

[0054] When adjusting the sandpaper belt, the position of the fixed tube 9 is adjusted by the first handle 11 to move it upward, and the structures such as the sliders 5 are reset. At the same time, the abutment end 24 is not in the gap 19. Then, the second roller 27 is rotated by the second handle 28. The rotation of the second roller will drive the sandpaper belt to move to a new position. After the position adjustment of the sandpaper belt is completed, the grinding operation can be continued.

[0055] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0056] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A manual grinding tool, characterized in that: It comprises a fixing seat and a fixing rod, and a cover plate detachably mounted on the fixing seat, a plurality of slide grooves and a plurality of first mounting grooves are equidistantly provided on the top wall of the fixing seat, a plurality of the first mounting grooves are each provided with a detachable sandpaper sheet, and a plurality of the slide grooves are each provided with a sliding block for limited sliding movement; It also includes an expansion component, the expansion component includes a fixed ring, a plurality of reset sheets are fixedly connected to the circumferential side of the fixed ring, and a plurality of slots are opened, and the ends of the reset sheets away from the fixed ring are respectively fixedly connected to a mounting frame and a plurality of support sheets, and the ends of the support sheets away from the reset sheets are abutment ends; A plurality of the slots are each inserted with a slidable first fixing sheet, both ends of the opening of the first fixing sheet are fixedly connected with a second fixing sheet, the top wall of the first fixing sheet is a slope structure, and the second fixing sheet and the support sheet are fixed in a detachable manner; A rotating rod is rotatably connected inside the mounting frame, a second roller is fixedly connected to the rotating rod, a top end of the rotating rod passes through the mounting frame and extends outwards, and a second handle is fixedly connected thereto; The surface of the fixing seat is also provided with an annular groove, a containing groove and a plurality of second mounting grooves, the plurality of first mounting grooves are connected to each other, and the plurality of first mounting grooves are connected to the plurality of second mounting grooves; The outer ends of the plurality of slide blocks are rotatably connected to the first rollers, the plurality of sandpaper sheets are connected to each other to form a sandpaper belt, and the sandpaper belt and the plurality of the first rollers are tensioned together; A plurality of convex strips are fixedly connected to the outer peripheral side walls of the first roller and the plurality of the second rollers, the plurality of convex strips are arranged around the first roller as the center, and a plurality of gaps are formed between the plurality of convex strips; A fixing tube is threadedly connected to the annular groove, the top of the fixing tube gradually narrows toward the bottom to form a tapered structure, and a fixing plate is fixedly connected to the top of the fixing tube, a through hole corresponding to the size of the fixing rod is opened on the top wall of the fixing plate, and a first handle is fixedly connected to the outer peripheral side wall of the fixing plate; A plurality of the support sheets are grouped into two and are respectively located on both sides of the slider, and the inner wall of the sandpaper sheet is in contact with the outer wall of the support sheet; When the outer ends of the two support sheets are inserted into the gap, the two sides of the first roller at the outer end of the slider can be effectively limited; The first handle adjusts the position of the fixed tube so that it moves upward and the abutting end is not in the gap. The second handle rotates the second roller to drive the sandpaper belt to move to a new position.

2. The manual grinding tool according to claim 1, characterized in that: The second mounting grooves form a group of two and are respectively located at two ends of the slide groove. The second mounting grooves and the support sheet are both L-shaped structures.

3. The manual grinding tool according to claim 2, characterized in that: Several of the reset plates are of wavy structure, the connection between the reset plate and the support plate is of planar structure, and the planar structure is fixedly connected to the inner end of the slide groove.

Images