Clamping tool for surface treatment of dental implant

Abstract

The utility model relates to the technical field of dental implant tools, and particularly discloses a clamping tool for surface treatment of a dental implant. The clamping tool comprises a clamping handle and an acid etching support. The clamping handle comprises a protective sleeve, a screw and a gasket. The screw comprises a screw cap, an inner rod section and an outer rod section which are sequentially connected. The nail cap is sleeved with the protective sleeve; the gasket wraps the inner rod section; the outer rod section is provided with an external thread; the dental implant is provided with an internal thread cavity. The outer rod section can be completely screwed into the internal thread cavity, so that the first end face of the gasket is attached to the end face where a cavity opening of the internal thread cavity of the dental implant is located, the covering end face of the protective sleeve is attached to the second end face of the gasket, and acid liquor is prevented from permeating into the end faces where the internal thread cavity and the cavity opening of the dental implant are located. And the acid etching brace is provided with a plurality of sample holes. When the dental implants are subjected to surface acid etching treatment, the plurality of dental implants are inserted into the plurality of sample holes one by one, and the dental implants are immersed into the acid liquor, so that the plurality of dental implants are subjected to acid etching at the same time.

Description

Technical Field

[0001] The present application relates to the technical field of dental implant tools, and more specifically, to a clamping tool for surface treatment of dental implants. Background Art

[0002] Dental implants are widely used in oral rehabilitation treatment for edentulous and missing teeth. The most common implant is pure titanium implant. After machining, pure titanium dental implants need to undergo a series of surface treatments. The common surface treatment process is large-particle sandblasting and acid etching (SLA). In the process of treating the surface of dental implants, the internal thread cavity of the dental implant connecting the screw and the end face where the cavity is located do not require surface treatment and need to be sealed and protected. Therefore, whether it is manual sandblasting or automatic sandblasting and subsequent acid etching treatment, a suitable masking fixture is required to seal and protect the parts of the dental implant that do not need to be treated.

[0003] Since dental implants are small in size, it is difficult to perform acid etching on multiple dental implants at the same time, and related processing devices need to be improved. Utility Model Content

[0004] In view of the difficulty in simultaneously performing acid etching on multiple dental implants, the present application proposes a clamping tool for surface treatment of dental implants. The clamping tool should be able to simultaneously perform acid etching on multiple dental implants, and during the treatment, the parts of the dental implant that do not need to be treated should be shielded, including the internal threaded cavity of the dental implant and the end face where the cavity is located. To this end, the present application adopts the following technical solution.

[0005] A clamping tool for surface treatment of dental implants, comprising a clamping handle and an acid etching brace. The clamping handle comprises a protective sleeve, a screw and a washer. The washer is made of acid-resistant material. The screw comprises a nail cap, an inner rod section and an outer rod section connected in sequence. The protective sleeve is sheathed on the nail cap; the washer wraps the inner rod section; the outer rod section is provided with an external thread; the dental implant has an internal thread cavity; the external thread of the outer rod section is arranged to be adaptably connected to the internal thread on the internal thread cavity.

[0006] The outer rod section can be completely screwed into the internal threaded cavity, so that the first end face of the gasket fits the end face where the cavity opening of the internal threaded cavity of the dental implant is located, and the covering end face of the protective sleeve fits the second end face of the gasket, so that the nail cap is wrapped between the protective sleeve and the second end face.

[0007] The acid etching support is provided with a plurality of sample holes; the outer width of the end face where the cavity opening is located is less than the width of the first end face; the gasket can pass through the sample holes; and the width of the sample holes is less than the width of the covering end face.

[0008] By adopting the above technical solution, the screw is screwed into the internal thread cavity of the dental implant, so that the first end face of the gasket fits the end face where the cavity opening of the internal thread cavity of the dental implant is located, and the covering end face of the protective sleeve fits the second end face of the gasket, so that the nail cap is wrapped between the protective sleeve and the second end face. When the dental implant is subjected to surface acid etching, the acid etching bracket is supported in acid liquid, and multiple dental implants are inserted into multiple sample holes one by one. The dental implants are immersed in the acid liquid, and a part of the gasket is also immersed in the acid liquid to ensure that the outer surface of the dental implant that needs to be acid-etched is completely immersed in the acid liquid. The protective sleeve wraps the nail cap to prevent the vibrating acid from penetrating between the protective sleeve and the second end face of the gasket and corroding the internal thread cavity of the dental implant that does not need to be corroded and the end face where the cavity opening of the internal thread cavity is located. The above realizes acid etching of multiple dental implants at the same time.

[0009] As a preferred embodiment of the clamping tool for surface treatment of dental implants, the inner rod segment is a smooth segment; and the length of the washer is greater than or equal to the length of the inner rod segment.

[0010] By adopting the above technical solution, it is only necessary to completely screw the outer rod section into the internal thread cavity of the dental implant, so that the gasket and the dental implant can form a closed fitting structure, preventing the acid from penetrating from between the gasket and the dental implant to the inner rod section, and further penetrating into the internal thread cavity of the dental implant and the end face where the cavity opening is located, and other places that do not require acid etching.

[0011] As a preferred embodiment of the clamping tool for surface treatment of dental implants, the protective sleeve is an elastic body, and a groove with a larger inner side and a smaller outer side is formed inwardly from the covering end surface, and the outer width of the groove is smaller than the width of the nail cap.

[0012] By adopting the above technical solution, the nail cap can be squeezed into the groove, and the protective cover can firmly wrap the nail cap without being easy to fall off.

[0013] As a preferred embodiment of the clamping tool for surface treatment of dental implants, the bottom width of the groove is equal to the width of the nail cap.

[0014] By adopting the above technical solution, the protective cover can wrap the nail cap more firmly.

[0015] As a preferred embodiment of the clamping tool for surface treatment of dental implants, the protective cover and the gasket are both made of fluororubber.

[0016] By adopting the above technical solution, the fluororubber has a certain elasticity and is resistant to acid corrosion, and can be squeezed to form a sealed connection, thereby preventing the penetration of acid.

[0017] As a preferred embodiment of the clamping tool for surface treatment of dental implants, the acid etching brace comprises a sample plate, a connecting column, an isolation plate and a plurality of supporting rods. The sample plate is provided with the plurality of sample holes; the connecting column connects the sample plate and the isolation plate which are separated from each other. The plurality of supporting rods are mounted on the isolation plate, and at least one section of each supporting rod faces away from the sample plate.

[0018] By adopting the above technical solution, the support rod supports the isolation plate in the acid solution, the connecting column fixes the sample plate on the isolation plate, and each dental implant is inserted downward into a sample hole, so that the dental implant is immersed in the acid solution for acid etching. A magnetic stirrer is placed in the acid solution, and the isolation plate can isolate the magnetic stirrer from possible collision damage to the dental implant.

[0019] As a preferred embodiment of the clamping tool for dental implant surface treatment, the sample plate and the isolation plate are parallel to each other and perpendicular to the connecting column.

[0020] By adopting the above technical solution, the structure of the device is stable, and multiple dental implant samples can be placed on the same horizontal plane and subjected to acid etching under the same conditions.

[0021] As a preferred embodiment of the clamping tool for treating the surface of a dental implant, the isolation disk has a plurality of penetrating acid holes.

[0022] By adopting the above technical solution, the acid liquid infiltrates the dental implant through the acid holes.

[0023] As a preferred embodiment of the clamping tool for surface treatment of dental implants, three edge threaded holes that are not in the same straight line are also provided at the inner periphery of the isolation disk; the acid etching brace includes three support rods engraved with external threads; the three support rods are threadedly connected to the three edge threaded holes one by one.

[0024] By adopting the above technical solution, the horizontality and height of the isolation plate and the sample plate can be adjusted. The support rod arranged at the edge of the isolation plate does not substantially hinder the movement of the stirring bar in the acid solution.

[0025] As a preferred embodiment of the clamping tool for dental implant surface treatment, the connecting column is provided with an external thread; the sample plate has a first central screw hole; the isolation plate has a second central screw hole; and the connecting column is threadedly connected to the first central screw hole and the second central screw hole respectively.

[0026] By adopting the above technical solution, the distance between the isolation plate and the sample plate can be adjusted.

[0027] In summary, the clamping tool for surface treatment of dental implants of the present application has the following beneficial effects:

[0028] The clamping tool for surface treatment of dental implant accessories is provided with an implant clamping handle and an acid etching support. The dental implant can be directly screwed into the screw of the clamping handle to complete the masking and clamping. The multiple sample holes provided on the upper disk of the acid etching support can be used to fix multiple dental implants at one time, thereby performing surface acid etching treatment on multiple dental implants, greatly improving the efficiency of dental implant surface treatment. During the surface treatment, the sealing part on the dental implant is protected, meeting the basic requirements for treating dental implants. The clamping tool of the present application has a simple structure, good sealing performance, and is easy to install, and is suitable for the surface treatment of dental implants. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings of the present application are used to explain some embodiments of the present application and do not constitute a limitation on the implementable methods of the present application.

[0030] Figure 1 It is a schematic cross-sectional structure diagram of a clamping handle in a clamping tool for surface treatment of a dental implant of the present application connected to a dental implant.

[0031] Figure 2 It is a schematic diagram of the structure of the acid etching brace in the clamping tool for surface treatment of dental implants of the present application.

[0032] Figure 3 yes Figure 1 Schematic diagram of the structure of the screw in the clamping handle.

[0033] Figure 4 yes Figure 1 Schematic diagram of the structure of a dental implant in a clamping handle.

[0034] Figure 5 yes Figure 1 Schematic diagram of the structure of the washer in the clamping handle.

[0035] Figure 6 yes Figure 1 Schematic diagram of the structure of the protective cover in the clamping handle.

[0036] Figure 7 yes Figure 2 Schematic diagram of the top view structure of the sample plate.

[0037] Figure 8 yes Figure 2 Schematic diagram of the top view of the isolation disk.

[0038] Fig. 9 yes Figure 2 Schematic diagram of the structure of the support rod.

[0039] Fig.10 yes Figure 2 Schematic diagram of the structure of the connecting column.

[0040] Figure numerals: 1. Clamping handle; 2. Acid etching brace; 11. Protective cover; 12. Screw; 13. Washer; 121. Nail cap; 122. Inner rod section; 123. Outer rod section; 3. Dental implant; 301. Internal threaded cavity; 131. First end face; 302. End face where the cavity opening is located; 111. Covering end face; 132. Second end face; 211. Sample hole; 112. Groove; 21. Sample plate; 22. Connecting column; 23. Isolation plate; 24. Support rod; 231. Acid hole; 232. Edge threaded hole; 212. First center screw hole; 233. Second center screw hole. DETAILED DESCRIPTION

[0041] The clamping tool for surface treatment of dental implants of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments, not all of the embodiments.

[0042] Please refer to Figure 1 , a clamping tool for surface treatment of dental implants, comprising a clamping handle 1. Please refer to Figure 2 The clamping tool also includes an acid etching support 2.

[0043] The clamping handle 1 comprises a protective cover 11, a screw 12 and a washer 13. The washer 13 is made of acid-resistant material.

[0044] Please refer to Figure 3 The screw 12 includes a nail cap 121, an inner rod section 122 and an outer rod section 123 which are connected in sequence.

[0045] The protective sleeve 11 is placed on the nail cap 121. The washer 13 wraps the inner rod section 122. The outer rod section 123 is provided with an external thread.

[0046] Please refer to Figure 4 The dental implant 3 has an internal thread cavity 301 . The external thread of the outer rod segment 123 is configured to be adaptably connected to the internal thread of the internal thread cavity 301 .

[0047] Please refer to Figure 5 Combined with Figure 4 The outer rod section 123 can be completely screwed into the internal thread cavity 301, so that the first end face 131 of the gasket 13 fits the end face 302 of the internal thread cavity 301 of the dental implant 3, forming a seamless connection. Please refer to Figure 6 The above also makes the covering end surface 111 of the protective cover 11 fit the second end surface 132 of the gasket 13 to form a seamless connection. Figure 1, so that the end face 302 where the cavity opening of the internal threaded cavity 301 of the dental implant 3 is located is shielded, and the nail cap 121 is wrapped between the protective cover 11 and the second end face 132, so that the acid cannot penetrate therein to corrode the screw 12 and the end face 302 where the cavity opening of the internal threaded cavity 301 of the dental implant 3 is located.

[0048] Please refer to Figure 7 The acid etching support 2 is provided with a plurality of sample holes 211. The outer width of the end surface 302 where the cavity is located is less than the width of the first end surface 131; the gasket 13 can pass through the sample hole 211; and the width of the sample hole 211 is less than the width of the covering end surface 111.

[0049] The method of using the clamping tool for surface treatment of the dental implant 3 can be as follows: screw the screw 12 into the internal thread cavity 301 of the dental implant 3, so that the first end face 131 of the washer 13 fits the end face 302 where the cavity opening of the internal thread cavity 301 of the dental implant 3 is located, and the covering end face 111 of the protective cover 11 fits the second end face 132 of the washer 13, so that the nail cap 121 is wrapped between the protective cover 11 and the second end face 132. When the dental implant 3 is subjected to surface acid etching treatment, the acid etching bracket 2 is supported in acid liquid, and multiple dental implants 3 are inserted into multiple sample holes 211 one by one, and the dental implants 3 are immersed in the acid liquid, and a part of the washer 13 is also immersed in the acid liquid, so as to ensure that the outer surface of the dental implant 3 to be etched is completely immersed in the acid liquid. The protective sleeve 11 wraps around the nail cap 121 to prevent the vibrating acid from penetrating between the protective sleeve 11 and the second end face 132 of the gasket 13 and corroding the inner thread cavity 301 of the dental implant 3 that does not need to be corroded and the end face 302 where the cavity opening of the inner thread cavity 301 is located. The above method realizes acid etching of multiple dental implants 3 at the same time.

[0050] For the screw 12 , the inner rod segment 122 is preferably a smooth segment, the inner rod segment 122 may be cylindrical, the washer 13 may be a cylindrical sleeve, the interior of the washer 13 is a cylindrical cavity, and the length of the washer 13 is ≥ the length of the inner rod segment 122 . It is only necessary to wrap the nail cap 121 with the protective cover 11, put the washer 13 on the inner rod segment 122, and completely screw the outer rod segment 123 into the inner threaded cavity 301 of the dental implant 3. The design structure of the inner rod segment 122 and the washer 13 can make the washer 13 slide relatively smoothly with the inner rod segment 122 in the mutually pressed structure of the protective cover 11, the washer 13 and the dental implant 3. The two ends of the washer 13 with sufficient length can be pressed against the protective cover 11 and the dental implant 3 to form a closed fitting structure, thereby preventing the acid from penetrating from between the washer 13 and the dental implant 3 to the inner rod segment 122, and further penetrating into the inner threaded cavity 301 of the dental implant 3 and the end face 302 where the cavity opening is located, and other places where acid etching is not required.

[0051] Please refer to Figure 6 The protective cover 11 is preferably an elastic body, and a groove 112 with a larger inner side and a smaller outer side is opened inward from the cover end surface 111. The groove 112 may be in the shape of a truncated cone, and the outer width of the groove 112 is smaller than the width of the nail cap 121. In this way, the nail cap 121 can be squeezed into the groove 112, and the protective cover 11 can firmly wrap the nail cap 121 and is not easy to fall off. It is further preferred that the groove bottom width of the groove 112 is equal to the width of the nail cap 121, and the nail cap 121 may be a cylinder, so that the protective cover 11 can wrap the nail cap 121 more firmly.

[0052] The protective cover 11 and the gasket 13 can be made of fluororubber, which has certain elasticity and is resistant to acid corrosion, and can be squeezed to form a sealed connection, thereby preventing the penetration of acid, and the squeezed part can return to its original state after the pushing force is removed.

[0053] The material of the screw 12 can be pure titanium. Pure titanium has low density, high strength, anti-oxidation and corrosion resistance, and is suitable for acid etching treatment of the dental implant 3.

[0054] Please refer to Figure 2 As another part of the clamping tool for surface treatment of the dental implant 3, an optional structure of the acid etching brace 2 is that the acid etching brace 2 includes a sample plate 21, a connecting column 22, an isolation plate 23 and a plurality of support rods 24. The material of each component of the acid etching brace 2 can be polytetrafluoroethylene, which is resistant to acid corrosion.

[0055] Please refer to Figure 7 The sample tray 21 is provided with the plurality of sample holes 211, preferably the sample holes 211 are evenly distributed, and each sample hole 211 can be inserted with a dental implant 3 for acid etching, so that the plurality of clamping handles 1 are evenly spaced to facilitate operation. The connecting column 22 connects the sample tray 21 and the isolation tray 23 which are separated from each other. The plurality of support rods 24 are installed on the isolation tray 23, and each of the support rods 24 has at least one section facing away from the sample tray 21. When the clamping fixture is used, the support rods 24 support the isolation tray 23 in the acid solution, the connecting column 22 fixes the sample tray 21 on the isolation tray 23, each dental implant 3 is inserted downward into a sample hole 211, and the protective cover 11 is stuck on the upper end surface of the sample hole 211, so that the dental implant 3 is immersed in the acid solution for acid etching. A magnetic stirrer is placed in the acid solution, and the isolation tray 23 can isolate the magnetic stirrer from possible collision damage to the dental implant 3.

[0056] Preferably, the sample plate 21 and the isolation plate 23 are parallel to each other and perpendicular to the connecting column 22. This arrangement has a stable structure, and multiple dental implant 3 samples can be placed on the same horizontal plane and subjected to acid etching under the same conditions.

[0057] Please refer to Figure 8 As a preferred embodiment of the clamping tool for surface treatment of the dental implant 3 , the isolation disk 23 has a plurality of penetrating acid holes 231 . The acid liquid can infiltrate the dental implant 3 through the acid holes 231 .

[0058] Please continue to refer to Figure 8 In order to support the isolation disk 23 in the acid solution and to adjust the height of the isolation disk 23, three edge threaded holes 232 that are not in the same straight line are designed to be arranged on the inner periphery of the isolation disk 23. Fig. 9 Combined with Figure 2 The acid etching support 2 includes three support rods 24 with external threads, and the external threads of the support rods 24 are preferably full-body threads, which are convenient for adjusting the height. The three support rods 24 are threadedly connected to the three edge threaded holes 232 one by one. By adjusting the depth of the three support rods 24 screwed into the isolation disk 23, the horizontality and height of the isolation disk 23 can be adjusted, and the support rods 24 arranged on the edge of the isolation disk 23 basically do not hinder the movement of the stirrer in the acid solution.

[0059] Please refer to Fig.10 In order to adjust the height of the sample plate 21 relative to the isolation plate 23, the connecting column 22 is designed to have an external thread, preferably a full-body external thread. Figure 7 , the sample plate 21 has a first central screw hole 212. Please refer to Figure 8 The isolation plate 23 has a second center screw hole 233, and the connecting column 22 is threadedly connected to the first center screw hole 212 and the second center screw hole 233 respectively. By rotating the connecting column 22 and / or the sample plate 21, the distance between the isolation plate 23 and the sample plate 21 can be easily adjusted.

[0060] Based on the above structure, the method for using the clamping tool can be as follows:

[0061] (1) Installation of the clamping handle 1 and sandblasting of the dental implant 3: Insert the nail cap 121 of the screw 12 into the protective sleeve 11 and clamp it, insert the inner rod section 122 of the screw 12 into the washer 13, expose the outer rod section 123 of the screw 12, screw the dental implant 3 into the outer rod section 123 so that the dental implant 3 squeezes the washer 13, complete the sealing protection of the dental implant 3, and then perform sandblasting on the dental implant 3. After the sandblasting is completed, the whole body can be directly cleaned.

[0062] (2) Installation of the acid etching support 2: screw the connecting column 22 into the first center screw hole 212 of the sample disk 21 and the second center screw hole 233 of the isolation disk 23, adjust the relative height of the two disks to a suitable level, screw the three support rods 24 into the three edge threaded holes 232 on the inner periphery of the isolation disk 23, and adjust the height of the isolation disk 23 so as not to hinder the movement of the stirring bar in the acid etching device.

[0063] (3) The dental implant 3 after sandblasting is directly inserted into the upper sample hole 211 of the assembled acid etching bracket 2, and the gasket 13 also passes through the sample hole 211, and the covering end surface 111 of the protective cover 11 covers the sample hole 211. The acid etching bracket 2 is placed in the acid etching device to perform the acid etching treatment on the dental implant 3.

[0064] The above operation is simple and convenient, and can perform acid etching treatment on multiple dental implants 3 at the same time, significantly improving the surface treatment efficiency of the dental implants 3 .

[0065] It should be noted that, in this application, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0066] Finally, it should be noted that the above is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application. Although the present application is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the subject matter and design principles of the present application shall fall within the scope of protection of the present application.

Claims

1. A clamping tool for surface treatment of dental implants, characterized in that: It comprises a clamping handle (1) and an acid-etching brace (2); The clamping handle (1) comprises a protective sleeve (11), a screw (12) and a washer (13); the washer (13) is made of an acid-resistant material; the screw (12) comprises a nail cap (121), an inner rod section (122) and an outer rod section (123) which are connected in sequence; the protective sleeve (11) is sheathed on the nail cap (121); the washer (13) wraps around the inner rod section (122); the outer rod section (123) is provided with an external thread; the dental implant (3) has an internal thread cavity (301); the external thread of the outer rod section (123) is configured to be adaptably connected to the internal thread on the internal thread cavity (301); The outer rod section (123) can be completely screwed into the internal thread cavity (301), so that the first end surface (131) of the gasket (13) fits the end surface (302) where the cavity opening of the internal thread cavity (301) of the dental implant (3) is located, and the covering end surface (111) of the protective sleeve (11) fits the second end surface (132) of the gasket (13), so that the nail cap (121) is wrapped between the protective sleeve (11) and the second end surface (132); The acid etching support (2) is provided with a plurality of sample holes (211); the outer width of the end surface (302) where the cavity opening is located is smaller than the width of the first end surface (131); the gasket (13) can pass through the sample holes (211); and the width of the sample holes (211) is smaller than the width of the covering end surface (111).

2. The clamping tool for dental implant surface treatment according to claim 1, characterized in that: The inner rod section (122) is a smooth section; the length of the washer (13) is greater than or equal to the length of the inner rod section (122).

3. The clamping tool for dental implant surface treatment according to claim 1, characterized in that: The protective sleeve (11) is an elastic body, and is provided with a groove (112) extending inward from the covering end surface (111), the groove (112) being larger inside and smaller outside, and the outer width of the groove (112) being smaller than the width of the nail cap (121).

4. The clamping tool for dental implant surface treatment according to claim 3, characterized in that: The bottom width of the groove (112) is equal to the width of the nail cap (121).

5. The clamping tool for dental implant surface treatment according to claim 3, characterized in that: The protective sleeve (11) and the gasket (13) are both made of fluororubber.

6. The clamping tool for dental implant surface treatment according to claim 1, characterized in that: The acid etching support (2) comprises a sample plate (21), a connecting column (22), an isolation plate (23) and a plurality of support rods (24); the sample plate (21) is provided with the plurality of sample holes (211); the connecting column (22) connects the sample plate (21) and the isolation plate (23) which are separated from each other; The plurality of support rods (24) are mounted on the isolation plate (23), and at least one section of each of the support rods (24) faces away from the sample plate (21).

7. The clamping tool for dental implant surface treatment according to claim 6, characterized in that: The sample plate (21) and the isolation plate (23) are parallel to each other and perpendicular to the connecting column (22).

8. The clamping tool for dental implant surface treatment according to claim 7, characterized in that: The isolation disk (23) has a plurality of penetrating acid holes (231).

9. The clamping tool for dental implant surface treatment according to claim 8, characterized in that: The inner periphery of the isolation disk (23) is also provided with three edge threaded holes (232) that are not in the same straight line; the acid etching support (2) comprises three support rods (24) engraved with external threads; the three support rods (24) are threadedly connected to the three edge threaded holes (232) one by one.

10. The clamping tool for dental implant surface treatment according to claim 6, characterized in that: The connecting column (22) is provided with an external thread; the sample plate (21) has a first central screw hole (212); the isolation plate (23) has a second central screw hole (233); and the connecting column (22) is respectively threadedly connected to the first central screw hole (212) and the second central screw hole (233).

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