Limiting structure and polishing and burnishing machine

Abstract

The present disclosure provides a limiting structure and a polishing machine. The limiting structure is used for being fixed on the polishing machine. The limiting structure comprises a gravity limiting piece and a lifting adjusting piece. The gravity limiting piece is arranged above a polishing assembly of the polishing machine and opposite to a polishing end of the polishing assembly. The gravity limiting piece is used for pressing and limiting a workpiece to be polished on the polishing end of the polishing assembly. The fixed end of the lifting adjusting piece is used for being fixed on the polishing machine. The lifting adjusting end of the lifting adjusting piece is fixedly connected with the gravity limiting piece. The limiting structure can effectively improve the convenience of the polishing machine.

Description

Technical Field

[0001] This disclosure relates to the technical field of grinding and polishing machines, and in particular to a limiting structure and a grinding and polishing machine. Background Technology

[0002] Polishing machines are mainly used for polishing products. Currently, polishing machines on the market generally fall into two categories: stationary and handheld. Stationary polishing machines require the operator to hold the workpiece and apply pressure to the polishing end of the machine to polish it (e.g., existing patent CN110732948A). Handheld polishing machines require the workpiece to be fixed in place before the operator uses the machine to polish it (e.g., existing patent CN104625934A). However, both types of polishing machines require manual pressure application, making them less convenient to use. Utility Model Content

[0003] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a limiting structure and a grinding and polishing machine with better ease of use.

[0004] The purpose of this disclosure is achieved through the following technical solution:

[0005] A limiting structure is provided for mounting and fixing on a grinding and polishing machine. The limiting structure includes a gravity limiting component and a lifting adjustment component. The gravity limiting component is disposed above the polishing assembly of the grinding and polishing machine and is positioned opposite to the polishing end of the polishing assembly. The gravity limiting component is used to press and limit the workpiece to be polished onto the polishing end of the polishing assembly. The fixed end of the lifting adjustment component is mounted and fixed on the grinding and polishing machine, and the lifting adjustment end of the lifting adjustment component is fixedly connected to the gravity limiting component.

[0006] In one embodiment, the gravity limiting member is detachably connected to the lifting adjustment end of the lifting adjustment member, and the gravity limiting member is slidably connected to the lifting adjustment end of the lifting adjustment member.

[0007] In one embodiment, the limiting structure further includes a first fastener, the lifting adjustment end of the lifting adjustment member is formed with a first guide limiting hole, the fixed end of the gravity limiting member is formed with a first threaded hole opposite to the first guide limiting hole, the first fastener passes through the first guide limiting hole and is screwed into the first threaded hole, and the first fastener slides against the hole wall of the first guide limiting hole.

[0008] In one embodiment, the lifting adjustment component includes a lifting drive part and a connecting fixing part. The fixing end of the lifting adjustment component is disposed on the lifting drive part, and the lifting adjustment end of the lifting adjustment component is disposed on the connecting fixing part. The lifting adjustment component is used to be installed and fixed on the grinding and polishing machine. The drive end of the lifting drive part is fixedly connected to the connecting fixing part. The first guide limiting hole is formed in the connecting fixing part so that the connecting fixing part is screwed and slidably connected to the gravity limiting component.

[0009] In one embodiment, the gravity limiting member has a first friction limiting surface formed on one side facing the polishing end of the polishing assembly.

[0010] In one embodiment, the limiting structure further includes an adjusting limiting component, which is used to be installed and fixed on the grinding and polishing machine. The limiting end of the adjusting limiting component is used to be positioned opposite to the polishing end of the polishing component, and the adjusting limiting component is used to limit the workpiece to be polished to the polishing end of the polishing component.

[0011] In one embodiment, the adjustment limiting component includes a limiting member and an adjusting member. The limiting end of the adjustment limiting component is disposed on the limiting member. The limiting member is detachably connected to the adjusting member, and the limiting member is slidably connected to the adjusting member. The adjusting member is used to be installed and fixed on the polishing component.

[0012] In one embodiment, the limiting structure further includes a second fastener, the limiting member having a second guide limiting hole, the adjusting member having a second threaded hole opposite to the second guide limiting hole, the second fastener passing through the second guide limiting hole and screwed into the second threaded hole, and the second fastener slidingly abutting against the hole wall of the second guide limiting hole.

[0013] In one embodiment, the adjusting member includes a first adjusting portion and a second adjusting portion, a second threaded hole is formed in the first adjusting portion, the limiting member is installed in the first adjusting portion, the second adjusting portion is used to be installed and fixed on the polishing assembly, and the first adjusting portion is slidably connected to the second adjusting portion.

[0014] In one embodiment, the first adjusting part forms a limiting flange, the second adjusting part forms a guide groove, the limiting flange is engaged in the guide groove, and the outer peripheral wall of the limiting flange slides against the inner wall of the guide groove.

[0015] In one embodiment, the limiting member has a second friction limiting surface formed on one side facing the polishing end of the polishing assembly.

[0016] A grinding and polishing machine includes a polishing component and a limiting structure as described in any of the above embodiments. The gravity limiting component is disposed above the polishing component of the grinding and polishing machine and is disposed opposite to the polishing end of the polishing component. The gravity limiting component presses and limits the workpiece to be polished on the polishing end of the polishing component. The fixed end of the lifting adjustment component is installed and fixed on the grinding and polishing machine.

[0017] Compared with the prior art, this disclosure has at least the following advantages:

[0018] 1. The aforementioned limiting structure includes a gravity limiting component and a lifting adjustment component. The gravity limiting component is positioned above the polishing assembly of the polishing machine and opposite to the polishing end of the polishing assembly. The gravity limiting component is used to press and limit the workpiece to be polished onto the polishing end of the polishing assembly. This allows the gravity limiting component to use its own weight to limit the workpiece to be polished, while also using its own weight to apply pressure to the polishing end of the polishing assembly, thereby greatly improving the ease of use of the polishing machine.

[0019] 2. Since the fixed end of the lifting adjustment component is used to install and fix it on the grinding and polishing machine, the lifting adjustment end of the lifting adjustment component is fixedly connected to the gravity limiting component, so that the operator can adjust the pressure between the gravity limiting component and the workpiece to be polished through the lifting adjustment component, thereby realizing the pressure control between the workpiece to be polished and the polishing end of the polishing assembly. This allows the operator to adjust the pressure between the workpiece to be polished and the polishing end of the polishing assembly according to the grinding and polishing requirements of different workpieces, thus greatly improving the applicability of the grinding and polishing machine. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a grinding and polishing machine according to one embodiment;

[0022] Figure 2 for Figure 1 The diagram shows another perspective view of the grinding and polishing machine;

[0023] Figure 3 for Figure 2 A partially enlarged schematic diagram of the grinding and polishing machine shown;

[0024] Figure 4 for Figure 2Another enlarged schematic diagram of a grinding and polishing machine shown;

[0025] Figure 5 for Figure 1 A partial structural diagram of the grinding and polishing machine is shown;

[0026] Figure 6 for Figure 1 Another partial structural diagram of the grinding and polishing machine shown;

[0027] Figure 7 for Figure 1 The diagram shows a structural model of a grinding and polishing machine. Detailed Implementation

[0028] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.

[0029] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] To better understand the technical solutions and beneficial effects of this disclosure, the following detailed description is provided in conjunction with specific embodiments:

[0032] like Figures 1 to 7As shown, in one embodiment, the limiting structure 100 is used to be installed and fixed on the polishing machine 10. The limiting structure 100 includes a gravity limiting member 110 and a lifting adjustment member 120. The gravity limiting member 110 is used to be disposed above the polishing assembly 200 of the polishing machine 10 and opposite to the polishing end of the polishing assembly 200. The gravity limiting member 110 is used to press and limit the workpiece to be polished on the polishing end of the polishing assembly 200, so that the gravity limiting member 110 can use its own gravity to limit the workpiece to be polished, and at the same time, the gravity limiting member 110 can also use its own gravity to apply pressure to the workpiece to be polished toward the polishing end of the polishing assembly 200, thereby greatly... This greatly improves the ease of use of the polishing machine 10. Meanwhile, the fixed end of the lifting adjustment component 120 is used to install and fix it on the polishing machine 10. The lifting adjustment end of the lifting adjustment component 120 is fixedly connected to the gravity limiting component 110, allowing the operator to adjust the pressure between the gravity limiting component 110 and the workpiece to be polished via the lifting adjustment component 120. This achieves pressure control between the workpiece to be polished and the polishing end of the polishing assembly 200, enabling the operator to adjust the pressure between the workpiece to be polished and the polishing end of the polishing assembly 200 according to the polishing requirements of different workpieces, thus greatly improving the applicability of the polishing machine 10.

[0033] In this embodiment, when the workpiece to be polished needs to be ground and polished, firstly, the gravity limiting member 110 is moved upward relative to the polishing assembly 200 by the lifting adjustment member 120 to increase the distance between the gravity limiting member 110 and the polishing end of the polishing assembly 200; then, the workpiece to be polished is placed on the polishing end of the polishing assembly 200; finally, the gravity limiting member 110 is moved downward relative to the polishing assembly 200 by the lifting adjustment member 120 to decrease the distance between the gravity limiting member 110 and the polishing end of the polishing assembly 200, so that the gravity limiting member 110 can press and limit the workpiece to be polished on the polishing end of the polishing assembly 200 by its own weight, thereby enabling the polishing end of the polishing assembly 200 to perform the grinding and polishing operation on the workpiece to be polished.

[0034] The aforementioned limiting structure 100 includes a gravity limiting member 110 and a lifting adjustment member 120. The gravity limiting member 110 is positioned above the polishing component 200 of the polishing machine 10 and is positioned opposite to the polishing end of the polishing component 200. The gravity limiting member 110 is used to press and limit the workpiece to be polished on the polishing end of the polishing component 200. This allows the gravity limiting member 110 to use its own weight to limit the workpiece to be polished, while also using its own weight to apply pressure to the polishing end of the polishing component 200, thereby greatly improving the ease of use of the polishing machine 10.

[0035] Furthermore, since the fixed end of the lifting adjustment component 120 is used to install and fix it on the polishing machine 10, and the lifting adjustment end of the lifting adjustment component 120 is fixedly connected to the gravity limiting component 110, the operator can adjust the pressure between the gravity limiting component 110 and the workpiece to be polished through the lifting adjustment component 120, thereby realizing pressure control between the workpiece to be polished and the polishing end of the polishing assembly 200. This allows the operator to adjust the pressure between the workpiece to be polished and the polishing end of the polishing assembly 200 according to the polishing requirements of different workpieces to be polished, thereby greatly improving the applicability of the polishing machine 10.

[0036] like Figures 1 to 3 As shown, in one embodiment, the gravity limiting member 110 is detachably connected to the lifting adjustment end of the lifting adjustment member 120 to reduce the difficulty of installing and disassembling the gravity limiting member 110 and the lifting adjustment member 120, thereby greatly reducing the difficulty of replacing the gravity limiting member 110 and thus greatly reducing the maintenance difficulty of the polishing machine 10; and the gravity limiting member 110 is slidably connected to the lifting adjustment end of the lifting adjustment member 120 so that the gravity limiting member 110 can slide relative to the lifting adjustment end of the lifting adjustment member 120, so that the operator can adjust the position of the gravity limiting member 110 according to the position of the workpiece to be polished, thereby ensuring that the gravity limiting member 110 can reliably press and limit the workpiece to be polished at the polishing end of the polishing assembly 200, thereby improving the applicability of the polishing machine 10.

[0037] like Figures 1 to 3 As shown, in one embodiment, the limiting structure 100 further includes a first fastener (not shown). The lifting adjustment end of the lifting adjustment member 120 forms a first guide limiting hole 121, and the fixed end of the gravity limiting member 110 forms a first threaded hole 111 opposite to the first guide limiting hole 121. The first fastener passes through the first guide limiting hole 121 and is screwed into the first threaded hole 111. The first fastener slides against the hole wall of the first guide limiting hole 121, which not only facilitates the replacement of the gravity limiting member 110, but also reduces the wear and tear on the polishing machine 10. The machine is convenient to use, and when the position of the gravity limiter 110 needs to be adjusted, the first fastener is first loosened, and then the gravity limiter 110 is slid relative to the lifting adjustment member 120 along the guiding direction of the first guide limiting hole 121 through the first fastener. When the gravity limiter 110 slides to the preset position, the first fastener is tightened so that the gravity limiter 110 can be reliably positioned at the preset position, thereby enabling the gravity limiter 110 to be aligned and adjusted according to the position of the workpiece to be polished, thus greatly improving the applicability of the polishing machine 10.

[0038] In this embodiment, the first fastener may be a screw or a bolt.

[0039] like Figures 1 to 3As shown, in one embodiment, the lifting adjustment member 120 includes a lifting drive part 122 and a connecting fixing part 123. The fixed end of the lifting adjustment member 120 is disposed on the lifting drive part 122, and the lifting adjustment end of the lifting adjustment member 120 is disposed on the connecting fixing part 123. The lifting adjustment member 120 is used to be installed and fixed on the polishing machine 10. The drive end of the lifting drive part 122 is fixedly connected to the connecting fixing part 123 so that the lifting drive part 122 can adjust the distance between the gravity limiting member 110 and the polishing end of the polishing assembly 200 through the connecting fixing part 123. The first guide limiting hole 121 is formed in the connecting fixing part 123 so that the connecting fixing part 123 is screwed and slidably connected to the gravity limiting member 110, so that the gravity limiting member 110 can slide relative to the connecting fixing part 123 along the guiding direction of the first guide limiting hole 121, thereby enabling the gravity limiting member 110 to be aligned and adjusted according to the position of the workpiece to be polished, thereby greatly improving the applicability of the polishing machine 10.

[0040] like Figure 1 and Figure 6 As shown, in one embodiment, the gravity limiting member 110 has a first friction limiting surface 112 formed on one side facing the polishing end of the polishing assembly 200, so that the gravity limiting member 110 can better limit the workpiece to be polished, thereby improving the limiting stability of the polishing machine 10.

[0041] like Figure 1 and Figure 6 As shown, in this embodiment, the first friction limiting surface 112 can be a soft rubber limiting surface or a rubber limiting surface. This not only increases the friction between the first friction limiting surface 112 and the workpiece to be polished, but also allows the first friction limiting surface 112 to adapt to the shape of the workpiece to be polished through its own elastic deformation when the gravity limiting member 110 presses and limits the workpiece to be polished with a complex shape. This increases the contact area between the first friction limiting surface 112 and the workpiece to be polished, and also makes the workpiece to be polished uniformly subjected to force, thereby greatly improving the limiting stability of the gravity limiting member 110.

[0042] like Figures 1 to 5 As shown, in one embodiment, the limiting structure 100 further includes an adjusting limiting component 130. The adjusting limiting component 130 is used to be installed and fixed on the polishing machine 10. The limiting end of the adjusting limiting component 130 is used to be positioned opposite to the polishing end of the polishing component 200. The adjusting limiting component 130 is used to limit the workpiece to be polished on the polishing end of the polishing component 200, so that the adjusting limiting component 130 can cooperate with the gravity limiting component 110 to limit the workpiece to be polished, thereby further improving the limiting stability of the polishing machine 10.

[0043] like Figures 1 to 5As shown, in one embodiment, the adjusting limiting component 130 includes a limiting member 131 and an adjusting member 132. The limiting end of the adjusting limiting component 130 is disposed on the limiting member 131. The limiting member 131 is detachably connected to the adjusting member 132, and the limiting member 131 is slidably connected to the adjusting member 132. The adjusting member 132 is used to install and fix on the polishing component 200. This not only facilitates the replacement of the limiting member 131, but also allows the limiting member 131 to slide relative to the adjusting member 132, so that the limiting member 131 can be adjusted according to the shape and placement position of the workpiece to be polished. This allows the limiting member 131 to abut against and limit the workpiece to be polished, thereby greatly improving the applicability of the polishing machine 10.

[0044] like Figures 1 to 5 As shown, in one embodiment, the limiting structure 100 further includes a second fastener (not shown). The limiting member 131 has a second guide limiting hole 1311, and the adjusting member 132 has a second threaded hole 1321 opposite to the second guide limiting hole 1311. The second fastener passes through the second guide limiting hole 1311 and is screwed into the second threaded hole 1321. The second fastener slides against the hole wall of the second guide limiting hole 1311, which not only facilitates the installation and removal of the limiting member 131 but also reduces the wear and tear on the polishing machine 10. The maintenance difficulty is reduced, and when the position of the limiting member 131 is needed, the second fastener is first loosened, and then the limiting member 131 is slid relative to the adjusting member 132 along the guiding direction of the second guiding limiting hole 1311 through the second fastener. When the limiting member 131 slides to the preset position, the second fastener is tightened so that the limiting member 131 can be reliably positioned at the preset position, thereby enabling the limiting member 131 to be aligned and adjusted according to the position of the workpiece to be polished, thus greatly improving the applicability of the polishing machine 10.

[0045] like Figures 1 to 5 As shown, in this embodiment, there are two second fasteners and two second threaded holes 1321. The two second threaded holes 1321 are arranged opposite to the second guide limiting hole 1311 and are spaced apart. The two second fasteners pass through the second guide limiting hole 1311 and are screwed to the two second threaded holes 1321 respectively. The outer walls of the two second fasteners abut against the hole walls of the second guide limiting hole 1311, so that the limiting member 131 can be reliably limited on the adjusting member 132 by the two second fasteners, avoiding the phenomenon of the limiting member 131 rotating relative to the adjusting member 132 when limiting the workpiece to be polished, thereby greatly improving the limiting stability of the polishing machine 10.

[0046] In this embodiment, the second fastener is a screw or bolt.

[0047] like Figures 1 to 5As shown, in one embodiment, the adjusting member 132 includes a first adjusting part 1322 and a second adjusting part 1323. A second threaded hole 1321 is formed in the first adjusting part 1322. A limiting member 131 is installed in the first adjusting part 1322. The second adjusting part 1323 is used to be installed and fixed on the polishing assembly 200. The first adjusting part 1322 is slidably connected to the second adjusting part 1323 so that the first adjusting part 1322 can drive the limiting member 131 to slide relative to the second sliding part. This allows the limiting member 131 to be adjusted according to the shape and placement position of the workpiece to be polished, thereby enabling the limiting member 131 to abut against and limit the workpiece to be polished, thus greatly improving the applicability of the polishing machine 10.

[0048] like Figures 1 to 5 As shown, in one embodiment, the first adjusting part 1322 forms a limiting flange 1322a, and the second adjusting part 1323 forms a guide groove 1323a. The limiting flange 1322a is engaged in the guide groove 1323a, and the outer peripheral wall of the limiting flange 1322a slides against the inner wall of the guide groove 1323a, so that the first adjusting part 1322 can drive the limiting member 131 to slide relative to the second adjusting part 1323 along the guiding direction of the guide groove 1323a, so that the limiting member 131 can be adjusted according to the shape and placement position of the workpiece to be polished, thereby enabling the limiting member 131 to abut against and limit the workpiece to be polished, thereby greatly improving the applicability of the polishing machine 10.

[0049] like Figures 1 to 5 As shown, in this embodiment, the limiting structure 100 further includes a third fastener (not shown), and the second adjusting part also forms a third guiding limiting hole (not shown) communicating with the guiding slide groove 1323. The limiting flange 1322 forms a third threaded hole (not shown) opposite to the third guiding limiting hole. The third fastener passes through the third guiding limiting hole and is screwed into the third threaded hole, which not only facilitates the installation and disassembly of the first adjusting part 1322 and reduces the maintenance difficulty of the polishing machine 10, but also allows for easy installation and disassembly of the first adjusting part 1322 when needed. When the first adjustment part 1322 is in position 1322, the third fastener is first loosened. Then, the first adjustment part 1322 drives the limiting part 131 to slide relative to the second adjustment part 1323 along the guiding direction of the third guide limiting hole 1311. When the first adjustment part 1322 slides to the preset position, the third fastener is tightened so that the first adjustment part 1322 can be reliably positioned at the preset position. This allows the limiting part 131 to be aligned and adjusted according to the position of the workpiece to be polished, thereby greatly improving the applicability of the polishing machine 10.

[0050] like Figure 5As shown, in one embodiment, the limiting member 131 has a second friction limiting surface 1312 formed on one side facing the polishing end of the polishing assembly 200, so that the limiting member 131 can better limit the workpiece to be polished, thereby improving the limiting stability of the polishing machine 10.

[0051] like Figure 5 As shown, in this embodiment, the second friction limiting surface 1312 can be a soft rubber limiting surface or a rubber limiting surface. This not only increases the friction between the second friction limiting surface 1312 and the workpiece to be polished, but also allows the second friction limiting surface 1312 to adapt to the shape of the workpiece to be polished through its own elastic deformation when the limiting member 131 presses and limits the workpiece to be polished with a complex shape. This increases the contact area between the first friction limiting surface 112 and the workpiece to be polished, and also makes the workpiece to be polished uniformly subjected to force, thereby greatly improving the limiting stability of the limiting member 131.

[0052] This disclosure also provides a polishing machine 10, including a polishing assembly 200 and a limiting structure 100 as described in any of the above embodiments. A gravity limiting member 110 is disposed above the polishing assembly 200 of the polishing machine 10 and is disposed opposite to the polishing end of the polishing assembly 200. The gravity limiting member 110 presses and limits the workpiece to be polished on the polishing end of the polishing assembly 200. The fixed end of the lifting adjustment member 120 is installed and fixed on the polishing machine 10.

[0053] Compared with the prior art, this disclosure has at least the following advantages:

[0054] 1. The aforementioned polishing machine 10, since the limiting structure 100 includes a gravity limiting member 110 and a lifting adjustment member 120, the gravity limiting member 110 is used to be set above the polishing component 200 of the polishing machine 10 and is set opposite to the polishing end of the polishing component 200. The gravity limiting member 110 is used to press and limit the workpiece to be polished on the polishing end of the polishing component 200, so that the gravity limiting member 110 can use its own gravity to limit the workpiece to be polished, while the gravity limiting member 110 can also use its own gravity to apply pressure to the workpiece to be polished toward the polishing end of the polishing component 200, thereby greatly improving the ease of use of the polishing machine 10.

[0055] 2. Since the fixed end of the lifting adjustment component 120 is used to install and fix it on the grinding and polishing machine 10, and the lifting adjustment end of the lifting adjustment component 120 is fixedly connected to the gravity limiting component 110, the operator can adjust the pressure between the gravity limiting component 110 and the workpiece to be polished through the lifting adjustment component 120, thereby realizing pressure control between the workpiece to be polished and the polishing end of the polishing assembly 200. This allows the operator to adjust the pressure between the workpiece to be polished and the polishing end of the polishing assembly 200 according to the grinding and polishing requirements of different workpieces, thereby greatly improving the applicability of the grinding and polishing machine 10.

[0056] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A limiting structure for mounting and fixing on a grinding and polishing machine, characterized in that, The limiting structure includes a gravity limiting component and a lifting adjustment component. The gravity limiting component is used to be disposed above the polishing component of the grinding and polishing machine and is positioned opposite to the polishing end of the polishing component. The gravity limiting component is used to press and limit the workpiece to be polished onto the polishing end of the polishing component. The fixed end of the lifting adjustment component is used to be installed and fixed on the grinding and polishing machine, and the lifting adjustment end of the lifting adjustment component is fixedly connected to the gravity limiting component.

2. The limiting structure according to claim 1, characterized in that, The gravity limiting component is detachably connected to the lifting adjustment end of the lifting adjustment component, and the gravity limiting component is slidably connected to the lifting adjustment end of the lifting adjustment component.

3. The limiting structure according to claim 2, characterized in that, The limiting structure further includes a first fastener. The lifting adjustment end of the lifting adjustment member is formed with a first guide limiting hole. The fixed end of the gravity limiting member is formed with a first threaded hole that is opposite to the first guide limiting hole. The first fastener passes through the first guide limiting hole and is screwed into the first threaded hole. The first fastener slides against the hole wall of the first guide limiting hole.

4. The limiting structure according to claim 3, characterized in that, The lifting adjustment component includes a lifting drive part and a connecting fixing part. The fixing end of the lifting adjustment component is located in the lifting drive part, and the lifting adjustment end of the lifting adjustment component is located in the connecting fixing part. The lifting adjustment component is used to be installed and fixed on the grinding and polishing machine. The drive end of the lifting drive part is fixedly connected to the connecting fixing part. The first guide limiting hole is formed in the connecting fixing part so that the connecting fixing part is screwed and slidably connected to the gravity limiting component; and / or, The gravity limiting member has a first friction limiting surface formed on one side facing the polishing end of the polishing assembly.

5. The limiting structure according to claim 1, characterized in that, The limiting structure further includes an adjusting limiting component, which is used to be installed and fixed on the grinding and polishing machine. The limiting end of the adjusting limiting component is used to be positioned opposite to the polishing end of the polishing component, and the adjusting limiting component is used to limit the workpiece to be polished to the polishing end of the polishing component.

6. The limiting structure according to claim 5, characterized in that, The adjustment and limiting assembly includes a limiting member and an adjusting member. The limiting end of the adjustment and limiting assembly is disposed on the limiting member. The limiting member is detachably connected to the adjusting member, and the limiting member is slidably connected to the adjusting member. The adjusting member is used to be installed and fixed on the polishing assembly.

7. The limiting structure according to claim 6, characterized in that, The limiting structure further includes a second fastener. The limiting member has a second guide limiting hole, and the adjusting member has a second threaded hole that is opposite to the second guide limiting hole. The second fastener passes through the second guide limiting hole and is screwed into the second threaded hole. The second fastener slides against the wall of the second guide limiting hole.

8. The limiting structure according to claim 7, characterized in that, The adjusting component includes a first adjusting part and a second adjusting part. The second threaded hole is formed in the first adjusting part. The limiting member is installed in the first adjusting part. The second adjusting part is used to be installed and fixed on the polishing assembly. The first adjusting part is slidably connected to the second adjusting part.

9. The limiting structure according to claim 8, characterized in that, The first adjusting part forms a limiting flange, and the second adjusting part forms a guide groove. The limiting flange is engaged within the guide groove, and the outer peripheral wall of the limiting flange slides against the inner wall of the guide groove; and / or, The limiting member has a second friction limiting surface formed on one side facing the polishing end of the polishing assembly.

10. A grinding and polishing machine, characterized in that, The invention includes a polishing assembly and a limiting structure as described in any one of claims 1 to 9. The gravity limiting member is disposed above the polishing assembly of the polishing machine and is disposed opposite to the polishing end of the polishing assembly. The gravity limiting member presses and limits the workpiece to be polished onto the polishing end of the polishing assembly. The fixed end of the lifting adjustment member is installed and fixed on the polishing machine.

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