Horizontal plating conductive clamp
By designing a conductive clamp for rotary horizontal plating, using a combined structure of mounting cylinder, clamping assembly, connector and insulating cover, the problem of uneven clamping force is solved, and the stable conductivity of the workpiece to be plated is achieved and High-efficiency electroplating effect.
Patent Information
- Application Number
- CN202420967775.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-07
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-05-07
AI Technical Summary
In the prior art, the clamping force of the rotary horizontal electroplating fixture is uneven, which may cause loosening of the workpiece to be plated during the electroplating process, affecting the electroplating effect.
A horizontally plated conductive clamp is designed, using a combined structure of mounting cylinder, clamping assembly, connector and insulating cover. The clamping assembly consists of a first clamp and a second clamp, locked in the connecting hole of the clamp through a connecting member, and an insulating cover covers outside the clamp to ensure that the clamping force is evenly distributed.
Through uniformly distributed clamping force, the stability and conductivity of the workpiece to be plated during the electroplating process is improved, the problem of loose fixtures is avoided, and the service life of the electroplating fixtures is extended.
Smart Images

Figure CN222434671U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electroplating technology, in particular to a horizontal electroplating conductive clamp. Background Art
[0002] Electroplating is a process that uses the principle of electrolysis to plate a thin layer of other metals or alloys on certain metal surfaces. There are many electroplating process methods, among which the rotary horizontal electroplating method can meet the electroplating needs of complex, extra-long and extra-large workpieces, so it is widely used. Rotary horizontal electroplating requires a fixture, which is used to clamp the workpiece to be plated. When powered on, the fixture energizes the workpiece to be plated and drives the workpiece to be plated to rotate when spraying chrome plating paint or in the electroplating solution of the electroplating tank, thereby forming a uniform coating on the surface of the workpiece to be plated.
[0003] The related technology discloses a connection plating mechanism, which includes a conductive part, a fastener and an insulating cover. There are two conductive parts, which are semi-cylindrical. The conductive parts are provided with connection holes that pass through the outer wall and the inner wall of the conductive parts. The fastener is locked in the connection holes of the two conductive parts, and the workpiece to be plated is clamped between the two conductive parts. The insulating cover covers the outer surfaces of the two conductive parts.
[0004] However, when the fastener is locked in the connecting hole, one end of the two conductive parts is enclosed to form an opening, and the workpiece to be plated can extend from the opening for plating. The two conductive parts clamp the workpiece to be plated by the fastening force provided by the fastener. The connecting hole is provided at the other end of the two conductive parts to avoid the workpiece to be plated. The fastening force is concentrated on the other end where the connecting hole is provided, which makes the clamping force of the two conductive parts on the workpiece to be plated uneven, which may cause looseness, thereby affecting the electroplating effect. Utility Model Content
[0005] The utility model aims to provide a horizontal plating conductive clamp to solve the problem of uneven clamping force of two conductive parts in the related art.
[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions.
[0007] The utility model provides a horizontally plated conductive clamp, which comprises: a mounting tube; a clamping assembly, comprising a first clamping plate and a second clamping plate, the first clamping plate and the second clamping plate enclosing a clamping cavity, the end face of the first clamping plate located at one end of the clamping cavity is connected to the end face of the mounting tube, the inner diameter of the clamping cavity is larger than the inner diameter of the mounting tube, so that the first clamping plate and the second clamping plate enclose a limiting surface located on the inner side of the clamping cavity on the end face of the mounting tube, the outer side face of the first clamping plate is provided with two symmetrically arranged first connecting ear plates, and the first connecting ear plate is provided with a first connecting hole, the outer side face of the second clamping plate is provided with two symmetrically arranged second connecting ear plates, and the second connecting ear plate is provided with a second connecting hole; a connecting piece, which can be detachably locked in the first connecting hole and the second connecting hole; an insulating cover, which is provided with two symmetrically arranged ear plate yielding areas, the insulating cover is arranged outside the first clamping plate and the second clamping plate, and the two ear plate yielding areas are respectively provided for two pairs of the first connecting ear plates and the second connecting ear plates to pass through.
[0008] In some embodiments of the present application, the insulating cover includes a first insulating cover and a second insulating cover, and the first insulating cover and the second insulating cover are enclosed to form a accommodating cavity for accommodating the first clamping plate and the second clamping plate; the ear plate yielding area includes a first half area provided on the first insulating cover and a second half area provided on the second insulating cover; the first insulating cover is connected to the first clamping plate, and the second insulating cover is connected to the second clamping plate.
[0009] In some embodiments of the present application, the first insulating cover includes a cover portion and a ring portion; the cover portion and the second insulating cover are combined to form a accommodating cavity for accommodating the first clamping plate and the second clamping plate; the end face of the ring portion is connected to the end face of the cover portion located at one end of the accommodating cavity; the cover portion is connected to the first clamping plate, and the ring portion is sleeved outside the mounting tube; the end face of the second insulating cover located at one end of the accommodating cavity abuts against the end face of the ring portion.
[0010] In some embodiments of the present application, the horizontal plating conductive clamp also includes a first fastener and a second fastener; a first mounting hole is opened on the first insulating cover, and a second mounting hole is opened on the second insulating cover; a first matching hole is provided on the first clamping plate, and a second matching hole is provided on the second clamping plate; the first fastener is locked in the first mounting hole and the first matching hole, and the second fastener is locked in the second mounting hole and the second matching hole.
[0011] In some embodiments of the present application, the ear plate yielding area is a through hole penetrating the outer wall and the inner wall of the insulating cover.
[0012] In some embodiments of the present application, a plurality of the first connecting holes and a plurality of the second connecting holes are provided; the plurality of the first connecting holes and the plurality of the second connecting holes are spaced apart and distributed along the axial direction of the clamping cavity.
[0013] In some embodiments of the present application, the first connecting ear plate and the second connecting ear plate are both in an elongated strip shape, and the first connecting ear plate and the second connecting ear plate extend from one end of the clamping cavity to the other end of the clamping cavity.
[0014] In some embodiments of the present application, the first connecting hole is a through hole; the second connecting hole is a countersunk hole;
[0015] The connecting member includes a head portion and a rod portion connected to each other; the rod portion passes through the first connecting hole and the second connecting hole, and the head portion is located in the second connecting hole.
[0016] It can be seen from the above technical solutions that the embodiments of the utility model have at least the following advantages and positive effects:
[0017] In the horizontal electroplating conductive fixture of the embodiment of the utility model, the mounting tube is used to be mounted on the conductive main shaft of the electroplating equipment, and the mounting tube can conduct electricity and rotate with the conductive main shaft. The first clamp is connected to the mounting tube, one end of the workpiece to be plated is placed in the first clamp, and then the second clamp is covered, so that the connecting member passes through and is locked in the first connecting hole and the second connecting hole. The connecting force provided by the connecting member enables the first clamp and the second clamp to be clamped on the workpiece to be plated, wherein the inner surface of the first clamp and the second clamp fits tightly to the outer side of the workpiece to be plated, and the end face of the workpiece to be plated can be against the limiting surface, thereby increasing the effective conductive cross-sectional area between the workpiece to be plated and the horizontal electroplating conductive fixture, and the limiting surface can limit the workpiece to be plated from sliding toward the side where the mounting tube is located, ensuring the stable position of the workpiece in the horizontal electroplating conductive fixture. The insulating cover has insulating properties, which can effectively avoid the phenomenon that the two clamps with conductive properties are also plated with a metal layer during the electroplating process, reducing the waste of electroplating solution and increasing the service life of the horizontal electroplating conductive fixture. The first connecting ear plate and the second connecting ear plate are respectively arranged on the outer sides of the two clamps, and the connection relationship between the first clamp and the second clamp is established by the connection between the two pairs of the first connecting ear plates and the second connecting ear plates. The connecting force is tighter and the connecting force can be more evenly distributed on the first clamp and the second clamp, avoiding the problem in the related technology that in order to avoid the workpiece to be plated, only one end of the first clamp and the second clamp are connected, resulting in concentrated connecting force, thereby making the clamping force uneven and easy to cause looseness. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The various objects, features and advantages of the present invention will become more apparent by considering the following detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. The accompanying drawings are only exemplary illustrations of the present invention and are not necessarily drawn to scale. In the accompanying drawings, the same reference numerals always represent the same or similar parts. Among them:
[0019] Figure 1 It is a schematic structural diagram of a horizontally-plated conductive fixture according to an exemplary embodiment.
[0020] Figure 2 yes Figure 1 Schematic diagram of the structure without the insulating cover.
[0021] Figure 3 yes Figure 2 Schematic diagram of the structure of the mounting tube and the first clamping plate.
[0022] Figure 4 yes Figure 2 Schematic diagram of the structure of the second splint.
[0023] Figure 5 yes Figure 1 Schematic diagram of the structure of the insulating cover.
[0024] Figure 6 yes Figure 5 Schematic diagram of the structure of the first insulating cover.
[0025] Figure 7 yes Figure 5 Schematic diagram of the structure of the second insulating cover.
[0026] The description of the accompanying drawings is as follows: 1. Installation cylinder; 11. Limiting surface; 2. Clamping assembly; 21. First clamping plate; 22. Second clamping plate; 23. First connecting ear plate; 231. First connecting hole; 24. Second connecting ear plate; 241. Second connecting hole; 3. Insulating cover; 31. First insulating cover; 311. Cover part; 312. Ring part; 313. First half zone; 32. Second insulating cover; 321. Second half zone; 33. Ear plate yield zone. DETAILED DESCRIPTION
[0027] Although the present invention can be easily embodied as embodiments of different forms, only some of the specific embodiments are shown in the drawings and described in detail in this specification. It should be understood that this description should be regarded as an exemplary description of the principles of the present invention and is not intended to limit the present invention to that described herein.
[0028] Thus, a feature indicated in this specification will be used to illustrate one of the features of an embodiment of the utility model, rather than implying that each embodiment of the utility model must have the described feature. In addition, it should be noted that this specification describes many features. Although some features can be combined together to illustrate possible system designs, these features can also be used in other combinations that are not explicitly described. Thus, unless otherwise stated, the described combinations are not intended to be limiting.
[0029] In the embodiments shown in the drawings, the indications of directions (such as up, down, left, right, front and back) used to explain the structure and movement of various elements of the utility model are not absolute but relative. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, the indications of these directions also change accordingly.
[0030] See also Figures 1 to 4 The conductive clamp for horizontal plating provided by one embodiment of the utility model mainly comprises a mounting tube 1, a clamping assembly 2, a connector and an insulating cover 3. The clamping assembly 2 comprises a first clamping plate 21 and a second clamping plate 22. The first clamping plate 21 and the second clamping plate 22 enclose a clamping cavity. The end face of the first clamping plate 21 at one end of the clamping cavity is connected to the end face of the mounting tube 1. The inner diameter of the clamping cavity is larger than the inner diameter of the mounting tube 1, so that the first clamping plate 21 and the second clamping plate 22 enclose a limiting surface 11 located inside the clamping cavity on the end face of the mounting tube 1. Two symmetrically arranged first connecting ear plates 23 are provided on the outer side face of the first clamping plate 21, and a first connecting hole 231 is provided on the first connecting ear plate 23. Two symmetrically arranged second connecting ear plates 24 are provided on the outer side face of the second clamping plate 22, and a second connecting hole 241 is provided on the second connecting ear plate 24. The connector is detachably locked in the first connecting hole 231 and the second connecting hole 241. The insulating cover 3 is provided with two symmetrically arranged ear plate clearance areas 33. The insulating cover 3 is arranged outside the first clamping plate 21 and the second clamping plate 22. The two ear plate clearance areas 33 are respectively provided for two pairs of first connecting ear plates 23 and second connecting ear plates 24 to pass through.
[0031] In the horizontal electroplating conductive fixture of the embodiment of the utility model, the mounting tube 1 is used to be mounted on the conductive spindle of the electroplating equipment, and the mounting tube 1 can conduct electricity and rotate with the conductive spindle. The first clamping plate 21 is connected to the mounting tube 1, and one end of the workpiece to be plated is placed in the first clamping plate 21, and then the second clamping plate 22 is covered, so that the connecting member passes through and is locked in the first connecting hole 231 and the second connecting hole 241. The connecting force provided by the connecting member enables the first clamping plate 21 and the second clamping plate 22 to be clamped on the workpiece to be plated, wherein the inner surfaces of the first clamping plate 21 and the second clamping plate 22 are tightly fitted to the outer side surface of the workpiece to be plated, and the end surface of the workpiece to be plated can be against the limiting surface 11, thereby increasing the effective conductive cross-sectional area between the workpiece to be plated and the horizontal electroplating conductive fixture, and the limiting surface 11 can limit the workpiece to be plated from sliding toward the side where the mounting tube 1 is located, ensuring the stable position of the workpiece in the horizontal electroplating conductive fixture. The insulating cover 3 has insulating properties, which can effectively prevent the two clamping plates from being plated with a metal layer during the electroplating process because they have conductive properties, thereby reducing the waste of electroplating solution and increasing the service life of the horizontal conductive clamp. The first connecting ear plate 23 and the second connecting ear plate 24 are respectively arranged on the outer side surfaces of the two clamping plates, and the connection relationship between the first clamping plate 21 and the second clamping plate 22 is established by connecting the two pairs of first connecting ear plates 23 and the second connecting ear plates 24. The connection force is more secure, and the connection force can be more evenly distributed on the first clamping plate 21 and the second clamping plate 22, thereby avoiding the problem in the related art that only one end of the first clamping plate 21 and the second clamping plate 22 is connected to avoid the workpiece to be plated, resulting in concentrated connection force, thereby making the clamping force uneven and prone to loosening.
[0032] It can be imagined that the shapes of the first clamping plate 21 and the second clamping plate 22 are adapted to the clamped end of the workpiece to be plated, that is, the first clamping plate 21 and the second clamping plate 22 can be completely clamped to the outer side surface of one end of the workpiece to be plated when they are enclosed, so that the workpiece to be plated can be evenly conductive and the conductive effect can be improved. In this embodiment, the shapes of the first clamping plate 21 and the second clamping plate 22 are semi-cylindrical with the same radius.
[0033] In this embodiment, the surface of the mounting tube 1 has threads, and the arrangement of the threads can increase the friction between the mounting tube 1 and the conductive main shaft to avoid loose connection, thereby ensuring that the electroplating conductive process can proceed stably.
[0034] See also Figures 5 to 7The insulating cover 3 includes a first insulating cover 31 and a second insulating cover 32, and the first insulating cover 31 and the second insulating cover 32 are enclosed to form a receiving cavity for accommodating the first clamping plate 21 and the second clamping plate 22. The ear plate yielding area 33 includes a first half area 313 provided on the first insulating cover 31 and a second half area 321 provided on the second insulating cover 32. The first insulating cover 31 is connected to the first clamping plate 21, and the second insulating cover 32 is connected to the second clamping plate 22. The first insulating cover 31 and the second insulating cover 32 are combined to form an effective package for the first clamping plate 21 and the second clamping plate 22, and the first half area 313 is used to avoid the first connecting ear plate 23, and the second half area 321 is used to avoid the second connecting ear plate 24. Since there is a corresponding relationship in shape between the two insulating covers and the two clamping plates, in the specific installation steps, the two clamping plates can be connected first, and then the two insulating covers can be enclosed, or the two clamping plates can be respectively connected to the two insulating covers respectively, and then the two clamping plates can be enclosed together, or other different methods can be used, which is relatively easy and flexible in installation.
[0035] See also Figure 6 , the first insulating cover 31 includes a cover portion 311 and a ring portion 312. The cover portion 311 and the second insulating cover 32 are enclosed to form a receiving cavity for accommodating the first clamping plate 21 and the second clamping plate 22. The end face of the ring portion 312 is connected to the end face of the cover portion 311 located at one end of the receiving cavity. The cover portion 311 is connected to the first clamping plate 21, and the ring portion 312 is sleeved outside the mounting tube 1. The end face of the second insulating cover 32 located at one end of the receiving cavity abuts against the end face of the ring portion 312. The ring portion 312 is sleeved on the mounting tube 1, and the cover portion 311 and the first clamping plate 21 are connected together. The cover portion 311 is used to insulate and block the outer surface of the first clamping plate 21. When the first insulating cover 31 and the second insulating cover 32 are enclosed, the end face of the ring portion 312 abuts against the second insulating cover 32, which increases the contact area between the first insulating cover 31 and the second insulating cover 32, making the overall structure of the insulating cover 3 more stable.
[0036] In the present embodiment, the horizontal plating conductive clamp further includes a first fastener and a second fastener. A first mounting hole is provided on the first insulating cover 31, and a second mounting hole is provided on the second insulating cover 32. A first matching hole is provided on the first clamping plate 21, and a second matching hole is provided on the second clamping plate 22. The first fastener is locked in the first mounting hole and the first matching hole, and the second fastener is locked in the second mounting hole and the second matching hole. A stable connection relationship between the two insulating covers and the two clamping plates is established by two fasteners. In the present embodiment, the first fastener and the second fastener are screws, the first mounting hole and the second mounting hole are through holes, the first matching hole and the second matching hole are screw holes, the rod of the first fastener passes through the first mounting hole and the first matching hole, the rod of the second fastener passes through the second mounting hole and the second matching hole, the threaded portion of the rod of the first fastener and the threaded portion of the rod of the second fastener are respectively screwed in the first matching hole and the second matching hole, and the heads of the first fastener and the second fastener are respectively pressed against the outer surfaces of the first insulating cover 31 and the second insulating cover 32, and the threaded connection has the advantages of fastening connection and simple structure.
[0037] See also Figure 1 , Figure 5 , Figure 6 and Figure 7 , the ear plate clearance area 33 is a through hole that penetrates the outer wall and the inner wall of the insulating cover 3. In this embodiment, the first connecting ear plate 23 and the second connecting ear plate 24 are coated with transparent glue for conductive shielding to prevent the first connecting ear plate 23 and the second connecting ear plate 24 from being plated with a metal layer during the electroplating process. In other embodiments, the first ear plate clearance area 33 and the second ear plate clearance area 33 are grooves that completely cover the first connecting ear plate 23 and the second connecting ear plate 24, and the first ear plate clearance area 33 is provided with a first clearance hole corresponding to the first connecting hole 231, and the second ear plate clearance area 33 is provided with a second clearance hole corresponding to the second connecting hole 241, and the connecting member is locked in the first clearance hole, the first connecting hole 231, the second clearance hole and the second connecting hole 241 at the same time.
[0038] See also Figures 1 to 4 , a plurality of first connection holes 231 and a plurality of second connection holes 241 are provided. The plurality of first connection holes 231 and the plurality of second connection holes 241 are spaced apart along the axial direction of the clamping cavity. The plurality of fasteners are respectively locked in the plurality of first connection holes 231 and the second connection holes 241, and a plurality of connection points can be established in the axial direction of the clamping cavity, thereby increasing the connection force between the first connection ear plate 23 and the second connection ear plate 24, thereby increasing the clamping force between the first clamping plate 21 and the second clamping plate 22, and enabling the uniformly distributed clamping force to act uniformly on the workpiece to be plated, thereby enhancing stability.
[0039] The first connecting ear plate 23 and the second connecting ear plate 24 are both in the shape of an elongated strip, and the first connecting ear plate 23 and the second connecting ear plate 24 extend from one end of the clamping cavity to the other end of the clamping cavity. The elongated structure can meet the requirements of the first connecting hole 231 and the second connecting hole 241 being spaced apart in the axial direction, and can avoid unnecessary waste of materials when making the connecting ear plates, thereby saving costs.
[0040] The first connecting hole 231 is a through hole. The second connecting hole 241 is a countersunk hole. The connecting member includes a head and a rod portion connected to each other. The rod portion passes through the first connecting hole 231 and the second connecting hole 241, and the head portion is located in the second connecting hole 241. The head portion is in the second connecting hole 241, which increases the contact area between the connecting member and the second connecting ear plate 24, improves the connection strength, and can prevent the head portion from protruding outside the second connecting ear plate 24, making the overall structure more compact and beautiful, and the setting of the countersunk hole makes it easier to operate when disassembling and assembling the connecting member. It can be imagined that in other embodiments, the first connecting hole 231 is a countersunk hole, and the second connecting hole 241 is a through hole. In this embodiment, the connecting member is a hexagon socket bolt, and the second connecting hole 241 is a hexagon socket countersunk hole.
[0041] It should be noted that in the above embodiment, the mounting tube 1, the first clamping plate 21, the second clamping plate 22, the first connecting ear plate 23 and the second connecting ear plate 24 are all made of conductive materials, and the insulating cover 3 has insulating properties. Although the utility model has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the utility model can be implemented in various forms without departing from the spirit or essence of the utility model, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be widely interpreted within the spirit and scope defined by the attached claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the attached claims.
Claims
1. A horizontal conductive fixture for clamping a workpiece to be plated, characterized in that: include: Install the barrel; The clamping assembly comprises a first clamping plate and a second clamping plate, wherein the first clamping plate and the second clamping plate are combined to form a clamping cavity, an end surface of the first clamping plate located at one end of the clamping cavity is connected to the end surface of the mounting tube, the inner diameter of the clamping cavity is larger than the inner diameter of the mounting tube, so that the first clamping plate and the second clamping plate enclose a limiting surface located on the inner side of the clamping cavity on the end surface of the mounting tube, two first connecting ear plates symmetrically arranged are provided on the outer side surface of the first clamping plate, and a first connecting hole is provided on the first connecting ear plate, and two second connecting ear plates symmetrically arranged are provided on the outer side surface of the second clamping plate, and a second connecting hole is provided on the second connecting ear plate; A connecting member, detachably locked in the first connecting hole and the second connecting hole; The insulating cover is provided with two symmetrically arranged ear plate yielding areas, the insulating cover is arranged outside the first clamping plate and the second clamping plate, and the two ear plate yielding areas are respectively used for two pairs of the first connecting ear plates and the second connecting ear plates to pass through.
2. The horizontal conductive plating fixture according to claim 1, characterized in that: The insulating cover comprises a first insulating cover and a second insulating cover, and the first insulating cover and the second insulating cover are enclosed to form a receiving cavity for receiving the first clamping plate and the second clamping plate; The ear plate yielding area includes a first half area provided on the first insulating cover and a second half area provided on the second insulating cover; The first insulating cover is connected to the first clamping plate, and the second insulating cover is connected to the second clamping plate.
3. The horizontal plating conductive fixture according to claim 2, characterized in that: The first insulating cover comprises a cover portion and a ring portion; The cover portion and the second insulating cover are enclosed to form a receiving cavity for receiving the first clamping plate and the second clamping plate; The end surface of the ring portion is connected to the end surface of the cover portion located at one end of the accommodating cavity; The cover portion is connected to the first clamping plate, and the ring portion is sleeved outside the mounting tube; An end surface of the second insulating cover located at one end of the accommodating cavity abuts against an end surface of the ring portion.
4. The horizontal plating conductive fixture according to claim 2, characterized in that: Also included is a first fastener and a second fastener; The first insulating cover is provided with a first mounting hole, and the second insulating cover is provided with a second mounting hole; The first clamping plate is provided with a first matching hole, and the second clamping plate is provided with a second matching hole; The first fastener is locked in the first mounting hole and the first matching hole, and the second fastener is locked in the second mounting hole and the second matching hole.
5. The horizontal plating conductive fixture according to claim 1, characterized in that: The ear plate yielding area is a through hole penetrating the outer wall and the inner wall of the insulating cover.
6. The horizontal plating conductive fixture according to claim 1, characterized in that: There are a plurality of the first connection holes and a plurality of the second connection holes; The plurality of first connection holes and the plurality of second connection holes are distributed at intervals along the axial direction of the clamping cavity.
7. The horizontal conductive plating fixture according to claim 6, characterized in that: The first connecting ear plate and the second connecting ear plate are both in a long strip shape, and the first connecting ear plate and the second connecting ear plate extend from one end of the clamping cavity to the other end of the clamping cavity.
8. The horizontal plating conductive fixture according to claim 1, characterized in that: The first connecting hole is a through hole; The second connecting hole is a countersunk hole; The connecting member comprises a head portion and a rod portion connected to each other; The rod portion passes through the first connecting hole and the second connecting hole, and the head portion is located in the second connecting hole.