Portable high polymer elastic 3D nylon grinding disc

Abstract

The application provides a portable polymer elastic 3D nylon grinding disc, which comprises a first grinding disc, a second grinding disc, a third grinding disc, a mounting ring and a small grinding disc, the first grinding disc and the second grinding disc are matched through a first threaded head and a butt joint threaded hole, the second grinding disc and the third grinding disc are matched through a second threaded head and a double-threaded hole lower half, the mounting ring and the third grinding disc are matched through a ring body connecting head and a double-threaded hole upper half, and the small grinding disc and the mounting ring are matched through a threaded head and a ring body threaded hole, which can be stacked to form a compact whole and greatly reduce the storage space; meanwhile, the ring body threaded hole at the bottom of the mounting ring can be adapted to non-circular small grinding discs such as conical and cylindrical ones, special tools do not need to be additionally carried, other components do not need to be loosened during disassembly and assembly, the carrying burden is reduced, and the operation efficiency is improved; the first grinding disc, the second grinding disc and the third grinding disc are respectively designed as coarse grinding, medium grinding and fine grinding granularity, and the fine grinding function of the small grinding disc is matched, so that the portability, multifunctional adaptability and convenient operation are comprehensively considered.

Description

Technical Field

[0001] This application relates to the field of nylon grinding disc technology, and more particularly to a portable polymer elastic 3D nylon grinding disc. Background Technology

[0002] In industrial processing, machinery repair, and handicrafts, grinding discs are widely used as important grinding tools for surface grinding, polishing, and shaping of various materials such as metal, wood, and plastic. With the diversification of work scenarios, especially the increasing demand for outdoor work, small-scale processing, and personal handicrafts, the market has placed higher demands on the portability and multi-functional adaptability of grinding discs.

[0003] The existing technology has the following problems: When multiple grinding discs are required for the operation, such as grinding discs of different grit sizes and different grinding precisions, multiple independent grinding discs need to be stored separately, which not only takes up a lot of space, but is also prone to collision and wear during transportation, resulting in damage to the surface of the grinding discs and affecting the grinding effect; at the same time, carrying multiple grinding discs separately also increases the inconvenience of storage and retrieval, especially in outdoor scenarios where there are no fixed storage conditions, the problem of poor portability is more prominent. Furthermore, most existing grinding discs can only perform their own grinding function and are not compatible with small non-circular grinding discs, such as conical or cylindrical grinding discs. However, in actual operation, some workpieces with special structures often require the use of non-circular grinding discs such as conical or cylindrical discs for fine grinding. In this case, operators need to carry additional tools specifically adapted to non-circular grinding discs, further increasing the carrying burden and affecting work efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a portable polymer elastic 3D nylon grinding disc in order to solve the above-mentioned problems.

[0005] The technical solution of this application is implemented as follows: This application provides a portable polymer elastic 3D nylon grinding disc, including a first grinding disc, a second grinding disc detachably mounted on the top of the first grinding disc, a third grinding disc detachably mounted on the top of the second grinding disc, an mounting ring detachably mounted on the top of the third grinding disc, and a small grinding disc detachably mounted on the bottom of the mounting ring. The mounting ring includes a ring body, and two sets of connecting frames are symmetrically arranged on the inner wall of the ring body. The two sets of connecting frames extend from the inner wall of the ring body toward the center of the ring body and are integrally formed with a ring body connector. The ring body can be detachably installed on the top of the third grinding disc through the ring body connector. The bottom array of the ring body has ring-shaped threaded holes, and the top of the small grinding disc is provided with a threaded head that matches the ring-shaped threaded holes, and can be detachably installed at the bottom of the ring body through the threaded head.

[0006] In one embodiment, the first grinding disc includes a first disc body, a first mounting groove is provided at the bottom of the first disc body, a mounting hole is provided through the bottom of the first mounting groove, and a first threaded head is vertically provided at the top of the first disc body corresponding to the top opening of the mounting hole. The first threaded head has an external thread structure, a hollow internal structure, and is connected to the top opening of the mounting hole. The first disc body can be detachably installed on the bottom of the second grinding disc through the first threaded head.

[0007] 1. In one embodiment, the second grinding disc includes a second disc body, the bottom of the second disc body is provided with a second mounting groove, and the bottom of the second mounting groove is provided with a threaded hole for mating. The first disc body is detachably installed on the bottom of the second disc body by threading a first threaded head into the threaded hole. A second threaded head is vertically provided at the top of the second disc body corresponding to the top opening of the mating threaded hole. The second threaded head has an external thread structure and a hollow internal structure, and is connected to the top opening of the mating threaded hole. The second disc body can be detachably installed at the bottom of the third grinding disc through the second threaded head.

[0008] In one embodiment, the third grinding disc includes a third disc body, a third mounting groove is provided at the bottom of the third disc body, and a double-ended threaded hole is provided through the bottom of the third mounting groove. The second disc body is detachably installed at the bottom of the third disc body by means of a second threaded head threaded into the lower half of the double-ended threaded hole. The ring body is detachably installed at the top of the third disc body by means of a ring body connector threaded into the upper half of the double-ended threaded hole.

[0009] In one embodiment, a first anti-scratch pad is adhered to the top of the first disc body, avoiding the mounting hole and the first threaded head.

[0010] In one embodiment, a second anti-scratch pad is adhered to the top of the second disc, avoiding the mating threaded hole and the second threaded head.

[0011] In one embodiment, a third anti-scratch pad is adhered to the top of the third disc, avoiding the location of the double-ended threaded hole.

[0012] In one embodiment, the first mounting slot, the second mounting slot, and the third mounting slot have the same structure and dimensions.

[0013] In one embodiment, the double-ended threaded hole is a single-hole structure. The lower half of the inner wall of the hole is provided with an internal thread adapted to the second threaded head, and the upper half of the inner wall of the hole is provided with an internal thread adapted to the ring connector. The upper and lower internal threads do not interfere with each other in the hole, thereby achieving independent threaded engagement with the second threaded head and the ring connector, respectively.

[0014] The advantages or beneficial effects of the above technical solutions include at least the following: This application discloses a portable polymer elastic 3D nylon grinding disc. The first grinding disc and the second grinding disc are engaged with the mating threaded hole through the first threaded head. The second grinding disc and the third grinding disc are engaged with the lower half of the double-ended threaded hole through the second threaded head. The mounting ring and the third grinding disc are engaged with the upper half of the double-ended threaded hole through the ring body connector. The small grinding disc and the mounting ring are engaged with the ring body threaded hole through the threaded head. They can be stacked to form a compact whole, which greatly reduces the storage space. Meanwhile, the threaded hole at the bottom of the mounting ring can be adapted to non-circular small grinding discs such as conical and cylindrical shapes, eliminating the need to carry special tools and allowing for disassembly and assembly without loosening other parts, thus reducing the burden of carrying and improving work efficiency. In addition, the first, second, and third grinding discs are designed for coarse, medium, and fine grinding particle sizes, respectively, which, together with the fine grinding function of the small grinding disc, fully take into account portability, multi-functional adaptability, and ease of operation. Attached Figure Description

[0015] The accompanying drawings illustrate exemplary embodiments of the present application and, together with the description thereof, serve to explain the principles of the present application. These drawings are included to provide a further understanding of the present application and are incorporated in and constitute a part of this specification.

[0016] Figure 1 An exploded structural diagram of the entire embodiment of this application is shown; Figure 2 A schematic diagram of the mounting ring structure according to an embodiment of this application is shown; Figure 3 A schematic diagram of the structure of the bottom of the mounting ring according to an embodiment of this application is shown; Figure 4 A schematic diagram of the structure of the first grinding disc according to an embodiment of this application is shown; Figure 5 An exploded structural diagram of the first grinding disc according to an embodiment of this application is shown; Figure 6 An exploded structural diagram of the second grinding disc according to an embodiment of this application is shown; Figure 7 A schematic diagram of the bottom structure of the second grinding disc according to an embodiment of this application is shown; Figure 8 A schematic diagram of the structure of the third grinding disc in the embodiment of this application is shown.

[0017] Reference numerals: First grinding disc-1, Second grinding disc-2, Third grinding disc-3, Mounting ring-4, Small grinding disc-5, First disc body-11, First mounting groove-12, Mounting hole-13, First threaded head-14, Second disc body-21, Second mounting groove-22, Butt threaded hole-23, Second threaded head-24, Third disc body-31, Third mounting groove-32, Double-ended threaded hole-33, Ring body-41, Connecting bracket-42, Ring body connector-43, Ring body threaded hole-44. Detailed Implementation

[0018] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While some embodiments of this application are shown in the drawings, it should be understood that this application can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this application. It should be understood that the drawings and embodiments of this application are for illustrative purposes only and are not intended to limit the scope of protection of this application.

[0019] It should be noted that, where there is no conflict, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] It should be understood that the term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc., mentioned in this application are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0021] It should be noted that the terms "a" and "several" used in this application are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0022] The names of the messages or information exchanged between multiple devices in the embodiments of this application are for illustrative purposes only and are not intended to limit the scope of these messages or information.

[0023] Reference Figure 1A portable polymer elastic 3D nylon grinding disc includes a first grinding disc 1, a second grinding disc 2 detachably mounted on the top of the first grinding disc 1, a third grinding disc 3 detachably mounted on the top of the second grinding disc 2, an mounting ring 4 detachably mounted on the top of the third grinding disc 3, and a small grinding disc 5 detachably mounted on the bottom of the mounting ring 4.

[0024] All of the above components are detachable, which solves the problems of large storage space and easy wear and tear when carrying various circular grinding discs. Furthermore, by using the mounting ring 4 to adapt to non-circular small grinding discs 5, it makes up for the functional shortcomings of traditional grinding discs, which can only process flat surfaces and cannot cope with narrow gaps or irregular curved surfaces.

[0025] In one embodiment, reference is made to Figures 2-3 The mounting ring 4 includes a ring body 41, which is made of nylon and is used to provide an installation position for the non-circular small grinding disc 5. At the same time, the outer diameter of the ring body 41 is larger than the outer diameter of the third disc body 31 to ensure that the non-circular small grinding disc 5 will not collide with or rub against the third disc body 31 after installation.

[0026] Two sets of connecting brackets 42 are symmetrically arranged on the inner wall of the ring body 41. The connecting brackets 42 are used to support the ring body connector 43 in the center, so that it is precisely aligned with the double-headed threaded hole 33 of the third grinding disc 3, ensuring the coaxiality of the installation ring 4 and the third grinding disc 3, increasing the stability during connection, and also providing a force point for the fingers when assembling and disassembling the ring body 41, making it easy to rotate and twist the ring body connector 43.

[0027] Two sets of connecting brackets 42 extend from the inner wall of the ring body 41 toward the center of the ring body 41 and are integrally formed with ring body connectors 43. The ring body 41 can be detachably installed on the top of the third grinding disc 3 through the ring body connectors 43, thereby realizing the detachable connection between the mounting ring 4 and the third grinding disc 3. When the small grinding disc 5 is not needed, the mounting ring 4 can be removed, and only three main grinding discs are used to meet the needs of different scenarios.

[0028] The bottom array of the ring body 41 has ring threaded holes 44, which are used to fit and install different types of small grinding discs 5 in multiple positions. By replacing different types of small grinding discs 5, the grinding discs can be expanded from flat grinding to fine grinding of irregular surfaces, without the need to carry special grinding tools, further improving portability and multi-functionality.

[0029] The top of the small grinding disc 5 is provided with a threaded head that matches the threaded hole 44 of the ring body, and it can be detachably installed at the bottom of the ring body 41 through the threaded head. The small grinding disc 5 can be designed as a small-sized conical or cylindrical structure. The conical small grinding disc can penetrate into the right-angle gaps and grooves of the workpiece to achieve grinding and polishing in the gaps; the cylindrical small grinding disc can roll and grind along the arc surface of the workpiece to ensure uniform grinding of the curved surface. The small grinding disc 5 can be quickly replaced with different types and grit sizes through the detachable engagement of the threaded head and the threaded hole 44 of the ring body. The operation is convenient, and when a single small grinding disc is damaged, only the small grinding disc body needs to be replaced, without replacing the mounting ring 4, thus reducing the cost of use.

[0030] In one embodiment, reference is made to Figures 4-5 The first grinding disc 1 includes a first disc body 11, which is made of high-polymer elastic 3D nylon material. This material has both elasticity and wear resistance. During grinding, the elasticity allows the grinding disc to better fit the surface of the workpiece and improve the uniformity of grinding; the wear resistance can prevent the disc body from cracking due to long-term grinding and extend its service life. At the same time, the material is lightweight, which further improves the overall portability.

[0031] The first disk body 11 has a first mounting groove 12 at the bottom, and a mounting hole 13 is provided through the bottom of the first mounting groove 12. The diameter of the mounting hole 13 is adapted to the connecting shaft of the external drive structure to provide a passage for the connecting shaft. The external drive structure is existing technology. This application does not impose additional limitations on its specific structure and working principle, but only uses its connecting shaft to cooperate with the mounting groove and mounting hole to drive the grinding disk. During assembly, the connecting shaft of the external drive structure is inserted into the mounting hole 13 along the axial direction of the first mounting groove 12, so that the end of the connecting shaft extends out of the bottom of the first mounting groove 12. Then, the nut is screwed into the external thread section of the connecting shaft until the end face of the nut presses against the inner bottom end face of the first mounting groove 12. Through the threaded engagement between the nut and the connecting shaft, the first disc 11 is rigidly fixed on the connecting shaft, thereby realizing that the external drive structure drives the first grinding disc 1 to rotate and grind through the connecting shaft. A first threaded head 14 is vertically provided at the top of the first disc 11, corresponding to the opening at the top of the mounting hole 13. The first threaded head 14 has an external thread structure and a hollow internal structure, and is connected to the opening at the top of the mounting hole 13. The first disc 11 can be detachably installed at the bottom of the second grinding disc 2 through the first threaded head 14. When multiple grinding discs need to be carried, the first grinding disc 1 can be screwed into the bottom of the second grinding disc 2 through the first threaded head 14, so that they are connected into a whole body, which is convenient for carrying and storage. The hollow structure of the first threaded head 14 is connected to the mounting hole 13, which can provide a passage for the connecting shaft of the external drive structure.

[0032] In one embodiment, reference is made to Figures 6-7 The second grinding disc 2 includes a second disc body 21, which is also made of high-polymer elastic 3D nylon material and can be designed to have a different grinding particle size than the first grinding disc 1 according to actual needs. The bottom of the second disc 21 is provided with a second mounting groove 22. When the second grinding disc 2 needs to be used alone, it can be directly fixed to the connecting shaft of the external drive structure through the second mounting groove 22, so that the connecting shaft of the external drive structure can cooperate with the second mounting groove 22 to drive the second grinding disc 2. When the first grinding disc 1 and the second grinding disc 2 are stacked, the groove of the second mounting groove 22 can wrap and protect the first thread head 14 of the first grinding disc 1, so as to avoid the thread head from being deformed by collision during the carrying process.

[0033] The bottom of the second mounting groove 22 is provided with a threaded hole 23. The first disc 11 is threadedly engaged with the threaded hole 23 by the first threaded head 14 and can be detachably installed on the bottom of the second disc 21.

[0034] The second disc 21 has a second threaded head 24 vertically positioned at the top of the threaded hole 23 corresponding to the top opening of the threaded hole 23. The second threaded head 24 has an external thread structure and a hollow internal structure, and is connected to the top opening of the threaded hole 23. The second disc 21 can be detachably installed at the bottom of the third grinding disc 3 via the second threaded head 24.

[0035] The second threaded head 24 allows the second grinding disc 2 to be installed on the bottom of the third grinding disc 3, making them connected as a single unit, which is convenient for carrying and storage. The hollow structure design provides a passage for the connecting shaft of the external drive structure, so that the connecting shaft of the external drive structure can cooperate with the second mounting groove 22 to drive the second grinding disc 2.

[0036] In one embodiment, reference is made to Figure 8 The third grinding disc 3 includes a third disc body 31, which is also made of the same high-polymer elastic 3D nylon and can be designed to be fine-grit. Together with the first disc body 11 and the second disc body 21, it forms a complete grinding gradient of coarse, medium and fine grinding, which meets the needs of the entire process from shaping to polishing of the workpiece.

[0037] The bottom of the third disc 31 is provided with a third mounting groove 32. The function of the third mounting groove 32 is the same as that of the second mounting groove 22. It can be fixed by the connecting shaft of the external drive structure alone, and it can also protect the second threaded head 24 when the second grinding discs 2 are stacked.

[0038] The bottom of the third mounting groove 32 is provided with a double-ended threaded hole 33. The second disc 21 is detachably installed at the bottom of the third disc 31 through the second threaded head 24 and the lower half of the double-ended threaded hole 33. The ring 41 is detachably installed at the top of the third disc 31 through the ring connector 43 and the upper half of the double-ended threaded hole 33.

[0039] Among them, the double-headed threaded hole 33 is a single hole structure. The inner wall of the lower half of the hole is provided with an internal thread that is compatible with the second threaded head 24, and the inner wall of the upper half of the hole is provided with an internal thread that is compatible with the ring connector 43. The upper and lower internal threads do not interfere with each other in the hole, and achieve independent threaded engagement with the second threaded head 24 and the ring connector 43 respectively. The integrated structural design simplifies the processing of the third disc 31, eliminating the need for two separate holes, saving space and reducing weight to improve portability; It can also achieve independent connection between the second grinding disc 2 and the mounting ring 4. The two internal threads do not interfere with each other and can be disassembled and installed separately. If only the second grinding disc 2 is replaced, the mounting ring 4 does not need to be disassembled, or only the mounting ring 4 is removed, the second grinding disc 2 does not need to be loosened. The operation is convenient, while ensuring the stability of the connection between the two. It also ensures the reliable realization of the grinding disc stacking function and the small grinding disc adaptation function.

[0040] Among them, the top of the first disc 11 is bonded with a first anti-scratch pad, avoiding the position of the mounting hole 13 and the first threaded head 14; the top of the second disc 21 is bonded with a second anti-scratch pad, avoiding the position of the mating threaded hole 23 and the second threaded head 24; and the top of the third disc 31 is bonded with a third anti-scratch pad, avoiding the position of the double-headed threaded hole 33. The first anti-scratch pad, the second anti-scratch pad, and the third anti-scratch pad are all made of nitrile rubber. When the first grinding disc 1 and the second grinding disc 2 are stacked, the first anti-scratch pad at the top of the first disc 11 will directly contact the bottom of the second disc 21, avoiding rigid friction caused by stacking pressure or carrying shaking, and preventing scratches and dents from appearing on the surface of the grinding disc. Similarly, when the second grinding disc 2 and the third grinding disc 3 are stacked, the second anti-scratch pad at the top of the second disc 21 will contact the bottom of the third disc 31 to isolate the adjacent discs, while the third anti-scratch pad at the top of the third disc 31 will protect its top surface after the mounting ring 4 is removed, when the third grinding disc 3 is used alone or in temporary contact with other components.

[0041] The first mounting slot 12, the second mounting slot 22 and the third mounting slot 32 have the same structure and size. This design can simplify mold development, reduce production complexity and cost on the processing end, and allow each grinding disc to be independently disassembled and directly adapted to the external drive structure on the user end. There is no need to distinguish the fixed bottom grinding disc. It can be used flexibly and individually according to grinding needs, reducing the burden of carrying and improving portability. At the same time, it can quickly replace the faulty grinding disc in emergency scenarios.

[0042] Working principle: The first threaded head 14 at the top of the first grinding disc 1 is threaded into the threaded hole 23 at the bottom of the second grinding disc 2, enabling a detachable connection between the two; the second threaded head 24 at the top of the second grinding disc 2 is threaded into the lower half of the internal thread of the double-ended threaded hole 33 at the bottom of the third grinding disc 3, enabling a detachable fixation between the two; the upper half of the internal thread of the double-ended threaded hole 33 at the top of the third grinding disc 3 is threaded into the ring body connector 43 of the mounting ring 4, enabling a detachable assembly of the mounting ring 4 and the third grinding disc 3; the ring body threaded hole 44 at the bottom of the mounting ring 4 is threaded into the threaded head at the top of the small grinding disc 5, enabling a detachable installation of the small grinding disc 5; When carried, the grinding discs can be stacked in sequence to form a whole. The first grinding disc 1 is screwed into the mating threaded hole 23 of the second grinding disc 2 through the first threaded head 14. The second grinding disc 2 is screwed into the lower half of the double-ended threaded hole 33 of the third grinding disc 3 through the second threaded head 24. The mounting ring 4 is screwed into the upper half of the double-ended threaded hole 33 through the ring body connector 43. The small grinding disc 5 is screwed into the ring body threaded hole 44 through the threaded head. The overall structure is compact and adjacent parts are isolated by the first anti-scratch pad, the second anti-scratch pad and the third anti-scratch pad to avoid rigid friction and wear when carried. When in use, the corresponding parts can be disassembled individually according to specific needs. If the coarse grinding function is required, only the first grinding disc 1 needs to be removed. The first grinding disc 1 is fixed by the connecting shaft of the external drive structure through the bottom first mounting groove 12 and mounting hole 13. For medium or fine grinding, the upper component can be removed separately to allow the second grinding disc 2 or the third grinding disc 3 to engage with the external drive structure through their respective mounting slots. For narrow gaps or irregular curved surfaces, the mounting ring 4 can be removed without loosening the third grinding disc 3. The conical or cylindrical small grinding disc 5 can be replaced through the threaded hole 44 of the ring body to achieve fine grinding. The three main grinding discs are designed for coarse, medium, and fine grinding grits, respectively, and are equipped with a replaceable small grinding disc 5, which has strong adaptability to the entire process and takes into account both portability and multi-functionality.

[0043] In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0044] Those skilled in the art should understand that the above embodiments are merely for illustrative purposes and are not intended to limit the scope of this application. Those skilled in the art can make other changes or modifications based on the above disclosure, and these changes or modifications still fall within the scope of this application.

Claims

1. A portable polymer elastic 3D nylon grinding disc, characterized in that: It includes a first grinding disc (1), a second grinding disc (2) is detachably mounted on the top of the first grinding disc (1), a third grinding disc (3) is detachably mounted on the top of the second grinding disc (2), an installation ring (4) is detachably mounted on the top of the third grinding disc (3), and a small grinding disc (5) is detachably mounted on the bottom of the installation ring (4). The mounting ring (4) includes a ring body (41), and two sets of connecting brackets (42) are symmetrically arranged on the inner wall of the ring body (41). The two sets of connecting brackets (42) extend away from the inner wall of the ring body (41) toward the center of the ring body (41) and are integrally formed with a ring body connector (43). The ring body (41) can be detachably installed on the top of the third grinding disc (3) through the ring body connector (43). The bottom array of the ring body (41) has ring thread holes (44), and the top of the small grinding disc (5) is provided with a thread head that matches the ring thread hole (44), and is detachably installed at the bottom of the ring body (41) through the thread head.

2. The portable polymer elastic 3D nylon grinding disc according to claim 1, characterized in that: The first grinding disc (1) includes a first disc body (11), a first mounting groove (12) is provided at the bottom of the first disc body (11), a mounting hole (13) is provided through the bottom of the first mounting groove (12), a first threaded head (14) is provided vertically at the top of the first disc body (11) corresponding to the opening of the top of the mounting hole (13), the first threaded head (14) is an external thread structure, the inside is a hollow structure, and it is connected to the opening of the top of the mounting hole (13); the first disc body (11) can be detachably installed at the bottom of the second grinding disc (2) through the first threaded head (14).

3. The portable polymer elastic 3D nylon grinding disc according to claim 2, characterized in that: The second grinding disc (2) includes a second disc body (21), a second mounting groove (22) is provided at the bottom of the second disc body (21), and a threaded hole (23) is provided through the bottom of the second mounting groove (22). The first disc body (11) is threadedly engaged with the threaded hole (23) by a first threaded head (14) and can be detachably installed at the bottom of the second disc body (21). The second disc (21) has a second threaded head (24) vertically positioned at the top of the threaded hole (23) corresponding to the top opening of the threaded hole (23). The second threaded head (24) has an external thread structure and a hollow internal structure, and is connected to the top opening of the threaded hole (23). The second disc (21) can be detachably installed at the bottom of the third grinding disc (3) through the second threaded head (24).

4. The portable polymer elastic 3D nylon grinding disc according to claim 3, characterized in that: The third grinding disc (3) includes a third disc body (31), a third mounting groove (32) is provided at the bottom of the third disc body (31), and a double-headed threaded hole (33) is provided through the bottom of the third mounting groove (32). The second disc body (21) is threadedly engaged with the lower half of the double-headed threaded hole (33) through the second threaded head (24) and can be detachably installed at the bottom of the third disc body (31). The ring body (41) is threadedly engaged with the upper half of the double-headed threaded hole (33) through the ring body connector (43) and can be detachably installed at the top of the third disc body (31).

5. The portable polymer elastic 3D nylon grinding disc according to claim 2, characterized in that: A first anti-scratch pad is attached to the top of the first disc (11), avoiding the mounting hole (13) and the first threaded head (14).

6. The portable polymer elastic 3D nylon grinding disc according to claim 3, characterized in that: The top of the second disc (21) is bonded with a second anti-scratch pad, avoiding the mating threaded hole (23) and the second threaded head (24).

7. The portable polymer elastic 3D nylon grinding disc according to claim 4, characterized in that: The top of the third disc (31) is fitted with a third anti-scratch pad, avoiding the opening position of the double-headed threaded hole (33).

8. The portable polymer elastic 3D nylon grinding disc according to claim 4, characterized in that: The first mounting slot (12), the second mounting slot (22) and the third mounting slot (32) have the same structure and size.

9. The portable polymer elastic 3D nylon grinding disc according to claim 4, characterized in that: The double-ended threaded hole (33) is a single hole structure. The inner wall of the lower half of the hole is provided with an internal thread that is compatible with the second threaded head (24). The inner wall of the upper half of the hole is provided with an internal thread that is compatible with the ring connector (43). The upper and lower internal threads do not interfere with each other in the hole, and achieve independent threaded engagement with the second threaded head (24) and the ring connector (43) respectively.

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