Automatic deviation correction system and method for connector

Abstract

The invention provides an automatic correction system and method for a connector. A plurality of stations are arranged on the periphery of the rotary table at intervals, the automatic deviation correcting device is arranged on one side of the rotary table, the first detection module is located on one side of the automatic deviation correcting device and is used for detection before deviation correction, and the second detection module is located on the other side of the automatic deviation correcting device and is used for detection after deviation correction. The automatic deviation correcting device comprises a supporting frame, an X-axis linear module, an X-axis movement unit and a Z-axis linear module, wherein the bottom of the supporting frame is arranged on a horizontal plane, the X-axis linear module is arranged on the supporting frame, the output direction of the X-axis linear module is parallel to the horizontal plane, the X-axis movement unit is pushed by the X-axis linear module in the horizontal direction, and the Z-axis linear module is arranged on the X-axis movement unit. The Z-axis moving unit is pushed by the Z-axis linear module in the direction perpendicular to the horizontal plane, the servo rotating shaft is arranged on the Z-axis moving unit, the rotating arm is driven by the servo rotating shaft and rotates around the direction perpendicular to the horizontal plane, and the pair of clamping claws is located at the tail end of the rotating arm. The method has the advantages that automatic deviation correction is adopted, deviation of the woven terminal is prevented, the reject ratio is low, the assembly efficiency is high, and the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of automated equipment, and in particular to an automatic deviation correction system and method for a connector. Background Art

[0002] The connector of the photovoltaic inverter is a key electrical component of photovoltaic equipment, which provides reliable connection and signal transmission functions. However, such connectors usually include a connector body for insulation and a braided terminal for conduction. The braided terminal includes multiple flexible copper braided wires. Therefore, the braided terminal is prone to deviation during the assembly process, resulting in inaccurate assembly and affecting product yield. Manual correction is not only time-consuming and labor-intensive, but also costly and inefficient. Summary of the invention

[0003] The object of the present invention is to provide an automatic deviation correction system and method for a connector, which adopts automatic deviation correction to prevent the braided terminal from deviating, has a low defect rate, high assembly efficiency and reduces production costs.

[0004] To achieve the purpose of the present invention, the present invention provides the following first technical solution: an automatic deviation correction system for a connector, comprising a turntable with a plurality of workstations arranged at intervals around it, an automatic deviation correction device arranged on one side of the turntable, a first detection module located on one side of the automatic deviation correction device and located for detection before deviation correction, and a second detection module located on the other side of the automatic deviation correction device and located for detection after deviation correction, wherein the automatic deviation correction device comprises a support frame with a bottom arranged on a horizontal plane, an X-axis linear module arranged on the support frame and with an output direction parallel to the horizontal plane, an X-axis motion unit pushed horizontally by the X-axis linear module, a Z-axis linear module arranged on the X-axis motion unit, a Z-axis motion unit pushed vertically by the Z-axis linear module in a horizontal direction, a servo rotating shaft arranged on the Z-axis motion unit, a rotating arm output by the servo rotating shaft and rotating around a direction vertical to the horizontal plane, and a pair of clamping claws located at the end of the rotating arm.

[0005] On the basis of the above technical solution, the following subsidiary technical solutions are further included:

[0006] The first detection module includes a first detection support column arranged on the central platform, a first detection light source fixed on the first detection support column and capable of providing lighting function to the work station cavity, and a first image recognition unit for performing image recognition on the main body; and the second detection module includes a second detection support column arranged on the central platform, a second detection light source fixed on the second detection support column and capable of providing lighting function to the work station cavity, and a second image recognition unit for performing image recognition on the main body.

[0007] The clamping claw is located between the first detection light source and the second detection light source.

[0008] A relatively stationary central platform is arranged in the middle of the turntable, wherein the first detection module and the second detection module are both fixed on the central platform, and each of the workstations is provided with a workstation cavity for accommodating a connector.

[0009] The connector at least includes a main body, a riveted terminal assembly located in the main body and used for conducting electricity, and an end cover connected to the main body and allowing the riveted terminal assembly to be partially exposed to the outside, wherein the riveted terminal assembly includes a braided terminal and an accessory terminal riveted to the braided terminal, wherein the braided terminal includes a contact portion located at one end and a braided portion located at the other end; and the mating terminal includes a riveted cavity located at one end, a mating column located at the other end and hollow inside, and riveted sheets located on both sides of the riveted cavity and capable of wrapping the braided portion.

[0010] The present invention provides the following second technical solution: a method for automatically correcting the deviation of a connector terminal, characterized in that it comprises the following steps:

[0011] Step S100: firstly provide an automatic deviation correction system for a connector, which comprises: a turntable with a plurality of stations arranged at intervals around it, an automatic deviation correction device arranged on one side of the turntable, a first detection module located on one side of the automatic deviation correction device and located for detection before deviation correction, and a second detection module located on the other side of the automatic deviation correction device and located for detection after deviation correction, wherein the automatic deviation correction device comprises a support frame with a bottom arranged on a horizontal plane, an X-axis linear module arranged on the support frame and with an output direction parallel to the horizontal plane, an X-axis motion unit pushed horizontally by the X-axis linear module, a Z-axis linear module arranged on the X-axis motion unit, a Z-axis motion unit pushed vertically by the Z-axis linear module, a servo rotating shaft arranged on the Z-axis motion unit, a rotating arm driven by the servo rotating shaft and rotating around a direction vertical to the horizontal plane, and a pair of clamping claws located at the end of the rotating arm; wherein the connector comprises at least a body, a riveted terminal assembly located in the body and used for conducting electricity, and an end cover connected to the body and allowing the riveted terminal assembly to be partially exposed to the outside, wherein the riveted terminal assembly comprises a braided terminal and an accessory terminal riveted and pressed with the braided terminal;

[0012] Step S200: then perform image recognition on the braided terminal in the connector to be corrected, and use a first detection module to detect whether the braided terminal image deviates from the preset image, if not, proceed to step S400, if yes, proceed to step S300;

[0013] Step S300: performing a deflection correction process on the braided terminal to be corrected and applying force downward, that is, clamping the braided terminal with a clamping claw to perform a deflection correction adjustment action and applying force downward, and then proceeding to step S500;

[0014] Step S400: Entering the station corresponding to the clamping claw, the clamping claw applies downward force to the braided terminal without performing a deviation correction process, then entering the station corresponding to the second detection module, and entering step S500;

[0015] Step S500: Continue to perform image recognition again on the connector that has completed the correction, and use the second detection module to detect whether the braided terminal image deviates from the preset image. If not, proceed to the next process until the end. If yes, proceed to step S600;

[0016] Step S600: terminating the deflection correction process, placing the connector that has not been successfully deflected into the unloading place for abnormal processing until the end.

[0017] On the basis of the above technical solution, the following subsidiary technical solutions are further included:

[0018] The first detection module includes a first detection support column arranged on the central platform, a first detection light source fixed on the first detection support column and capable of providing lighting function to the work station cavity, and a first image recognition unit for performing image recognition on the main body; and the second detection module includes a second detection support column arranged on the central platform, a second detection light source fixed on the second detection support column and capable of providing lighting function to the work station cavity, and a second image recognition unit for performing image recognition on the main body.

[0019] The clamping claw is located between the first detection light source and the second detection light source.

[0020] A relatively stationary central platform is arranged in the middle of the turntable, wherein the first detection module and the second detection module are both fixed on the central platform, and each of the workstations is provided with a workstation cavity for accommodating a connector.

[0021] The braided terminal includes a contact portion at one end and a braided portion at the other end; and the matching terminal includes a riveting cavity at one end, a matching column at the other end and hollow inside, and riveting sheets at both sides of the riveting cavity and capable of wrapping the braided portion.

[0022] Compared with the prior art, the present invention has the following positive effects: automatic deviation correction is adopted to prevent the braided terminal from deviating, the defective rate is low, the assembly efficiency is high, and the production cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a stereoscopic view of the connector body of the present invention without the riveted terminal assembly installed.

[0025] Figure 2 It is a stereoscopic view of the connector body after the riveted terminal assembly is installed in the present invention.

[0026] Figure 3 It is a stereoscopic diagram of the braided terminal in the present invention.

[0027] Figure 4 It is a three-dimensional diagram of the matching terminal in the present invention.

[0028] Figure 5 It is a stereoscopic view of the riveted terminal assembly in the present invention.

[0029] Figure 6 It is a perspective view of the first embodiment of the present invention.

[0030] Figure 7 yes Figure 6 A three-dimensional diagram of the automatic deviation correcting device. DETAILED DESCRIPTION

[0031] In the description of the present invention, it should be noted that, unless otherwise specified, "plurality" means two or more than two; the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "front end", "back end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplification, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0033] The specific implementation modes of the present invention are further described in detail below with reference to the accompanying drawings.

[0034] Example: Figure 1-7As shown, the present invention discloses a first embodiment of an automatic deviation correction system for a connector, which is used to assemble a connector, which is specifically a photovoltaic inverter connector; the connector is a common cylindrical shape, such as Figure 1-2 As shown, it comprises: a body 100 made of insulating material and having a body cavity 120, a riveted terminal assembly located in the body cavity 120 and used for conducting electricity, and an end cap 300 connected to the body 100 and allowing the riveted terminal assembly to be partially exposed. Figure 3-5 As shown, the riveted terminal assembly includes a braided terminal and an accessory terminal connected to the braided terminal by riveting, wherein the braided terminal includes a contact portion 220 located at one end and a braided portion 240 located at the other end; and the matching terminal includes a riveted cavity 260 located at one end, a matching column 280 located at the other end and having a hollow interior, and riveted sheets 290 located on both sides of the riveted cavity 260 and capable of wrapping the braided portion 240. The assembled structure is shown in FIG. Figure 2 As shown. Connectors are generally divided into male connectors and female connectors. The male connectors and female connectors have similar structures and can both be assembled using the automatic deviation correction system of the connector in this patent. In this embodiment, the processing is as follows Figure 1 and Figure 2 The automatic deviation-correcting system of this embodiment is described with reference to the female connector.

[0035] like Figure 6-7 As shown, the present invention provides a first embodiment of an automatic deviation correction system for a connector, which includes a turntable 2000 with a plurality of workstations spaced around it, an automatic deviation correction device 3000 arranged on one side of the turntable 2000, a first detection module located on one side of the automatic deviation correction device 3000 and located for detection before deviation correction, and a second detection module located on the other side of the automatic deviation correction device 3000 and located for detection after deviation correction.

[0036] The turntable 2000 is circular, and each station is provided with a station cavity 2200 for accommodating the body 100. The stations on the turntable 2000 may include multiple processes, such as detection, deviation correction, and the process of installing the end cover 300 to the body 100. A relatively stationary center table is provided in the middle of the turntable 2000, wherein the first detection module and the second detection module are both fixed on the center table.

[0037] The automatic deviation correction device 3000 includes a support frame 3200 with its bottom set on a horizontal plane, an X-axis linear module 3240 set on the support frame 3200 and with its output direction parallel to the horizontal plane, an X-axis motion unit 3260 pushed horizontally by the X-axis linear module 3240, a Z-axis linear module 3440 set on the X-axis motion unit 3260, a Z-axis motion unit 3460 pushed vertically by the Z-axis linear module 3440, a servo rotating shaft 3640 set on the Z-axis motion unit 3460, a rotating arm 3660 driven by the servo rotating shaft 3640 and rotating around a direction vertical to the horizontal plane, and a pair of clamping claws 3680 located at the end of the rotating arm 3660. The bottom of the turntable 2000 is also set on the horizontal plane. The linear modules in the X-axis linear module 3240 and the Z-axis linear module 3440 are all driven by servo motors to drive ball screw structures to achieve linear motion, and the motion is more reliable and accurate. The servo rotating shaft 3640 is the output shaft of the servo motor.

[0038] The first detection module includes a first detection support column 4200 arranged on the central platform, a first detection light source 4240 fixed on the first detection support column 4200 and capable of providing lighting function to the workstation cavity 2200, and a first image recognition unit 4260 for image recognition of the body 100. The second detection module includes a second detection support column 4400 arranged on the central platform, a second detection light source 4440 fixed on the second detection support column 4400 and capable of providing lighting function to the workstation cavity 2200, and a second image recognition unit 4460 for image recognition of the body 100. The first image recognition unit 4260 and the second image recognition unit 4460 are charge coupled device (CCD) cameras. The extension directions of the first detection support column 4200 and the first detection light source 4240 are parallel to each other. The extension directions of the second detection support column 4400 and the second detection light source 4440 are parallel to each other.

[0039] Based on the first embodiment, a second embodiment of a method is further provided, which comprises the following steps:

[0040] Step S100: First, an automatic deviation correction system for a connector is provided, which includes: a turntable 2000 with a plurality of stations spaced around it, an automatic deviation correction device 3000 arranged on one side of the turntable 2000, a first detection module located on one side of the automatic deviation correction device 3000 and located for detection before deviation correction, and a second detection module located on the other side of the automatic deviation correction device 3000 and located for detection after deviation correction, wherein the automatic deviation correction device 3000 includes a support frame 3200 with a bottom disposed on a horizontal plane, an X-axis linear module 3240 disposed on the support frame 3200 and with an output direction parallel to the horizontal plane, an X-axis motion unit 3260 pushed horizontally by the X-axis linear module 3240, and a second detection module disposed on the other side of the automatic deviation correction device 3000 and located for detection after deviation correction. The Z-axis linear module 3440 on the X-axis motion unit 3260, the Z-axis motion unit 3460 pushed by the Z-axis linear module 3440 in a direction perpendicular to the horizontal plane, the servo rotating shaft 3640 arranged on the Z-axis motion unit 3460, the rotating arm 3660 driven by the servo rotating shaft 3640 and rotating around a direction perpendicular to the horizontal plane, and a pair of clamping claws 3680 located at the end of the rotating arm 3660; wherein the connector at least includes a body 100, a riveted terminal assembly located in the body and used for conducting electricity, and an end cover 300 connected to the body 100 and allowing the riveted terminal assembly to be partially exposed to the outside, wherein the riveted terminal assembly includes a braided terminal and an accessory terminal riveted and pressed with the braided terminal;

[0041] Step S200: Then, the braided terminal in the connector to be corrected is subjected to image recognition, and the first detection module is used to detect whether the braided terminal image deviates from the preset image. If not, step S400 is performed, and if yes, step S300 is performed. At this time, the exposed braided terminal head needs to be corrected because the braided terminal is a bendable and deformable material.

[0042] Step S300: Correct the braided terminal to be corrected and apply downward force, that is, clamp the braided terminal by the clamping claw 3680 to perform a correction adjustment action and apply downward force to ensure that the height of the exposed braided terminal head is within a preset range, and enter step S500, wherein the correction adjustment action is specifically: the braided terminal head originally tilted to the left is corrected to the right, and the braided terminal head originally tilted to the right is corrected to the left;

[0043] Step S400: Enter the workstation corresponding to the clamping claw 3680, the clamping claw 3680 applies force to the braided terminal downward without performing a correction process to ensure that the height of the exposed braided terminal head is within a preset range, then enter the workstation corresponding to the second detection module, and enter step S500;

[0044] Step S500: Continue to perform image recognition again on the connector that has completed the correction, and use the second detection module to detect whether the image is deviated from the preset image. If not, proceed to the next process until the end. If yes, proceed to step S600;

[0045] Step S600: terminating the deflection correction process, placing the connector that has not been successfully deflected into the unloading place for abnormal processing until the end.

[0046] Preferably, the first detection module includes a first detection support column 4200 provided on the central platform, a first detection light source 4240 fixed on the first detection support column 4200 and capable of providing lighting function to the workstation cavity 2200, and a first image recognition unit 4260 for performing image recognition on the body 100; and the second detection module includes a second detection support column 4400 provided on the central platform, a second detection light source 4440 fixed on the second detection support column 4400 and capable of providing lighting function to the workstation cavity 2200, and a second image recognition unit 4460 for performing image recognition on the body 100. The first detection light source 4240 and the second detection light source 4440 are annular light sources, and the input ends of the first image recognition unit 4260 and the second image recognition unit 4460 are surrounded by corresponding annular light sources.

[0047] Preferably, the clamping claw 3680 is located between the first detection light source 4240 and the second detection light source 4440 .

[0048] Preferably, a relatively stationary central platform is provided in the middle of the turntable 2000, wherein the first detection module and the second detection module are both fixed on the central platform, and the workstations are all provided with workstation cavities 2200 for accommodating connectors.

[0049] Preferably, the woven terminal includes a contact portion 220 at one end and a woven portion 240 at the other end; and the mating terminal includes a rivet cavity 260 at one end, a mating column 280 located at the other end and hollow inside, and rivet sheets 290 located on both sides of the rivet cavity 260 and capable of wrapping the woven portion 240.

[0050] The invention has the advantages of adopting automatic deviation correction to prevent the braided terminal from deviating, low defective rate, high assembly efficiency and reduced production cost.

[0051] The above are only preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make several modifications and improvements without departing from the creative concept of the present invention, which should be included in the protection scope of the present invention.

Claims

1. An automatic deviation correction system for a connector, characterized in that It includes: A turntable (2000) with a plurality of workstations arranged at intervals around it, an automatic deviation correction device (3000) arranged on one side of the turntable (2000), a first detection module located on one side of the automatic deviation correction device (3000) and located for detection before deviation correction, and a second detection module located on the other side of the automatic deviation correction device (3000) and located for detection after deviation correction, wherein the automatic deviation correction device (3000) comprises a support frame (3200) with a bottom portion arranged on a horizontal plane, an X-axis linear module (3240) arranged on the support frame (3200) and with an output direction parallel to the horizontal plane , an X-axis motion unit (3260) pushed in the horizontal direction by the X-axis linear module (3240), a Z-axis linear module (3440) arranged on the X-axis motion unit (3260), a Z-axis motion unit (3460) pushed in the vertical horizontal plane direction by the Z-axis linear module (3440), a servo rotating shaft (3640) arranged on the Z-axis motion unit (3460), a rotating arm (3660) driven by the servo rotating shaft (3640) and rotating around the vertical horizontal plane direction, and a pair of clamping claws (3680) located at the end of the rotating arm (3660).

2. The automatic deviation correction system according to claim 1, characterized in that: The first detection module includes a first detection support column (4200) arranged on the central platform, a first detection light source (4240) fixed on the first detection support column (4200) and capable of providing lighting function to the workstation cavity (2200), and a first image recognition unit (4260) for performing image recognition on the main body (100); and the second detection module includes a second detection support column (4400) arranged on the central platform, a second detection light source (4440) fixed on the second detection support column (4400) and capable of providing lighting function to the workstation cavity (2200), and a second image recognition unit (4460) for performing image recognition on the main body (100).

3. The automatic deviation correction system according to claim 2, characterized in that: The clamping claw (3680) is located between the first detection light source (4240) and the second detection light source (4440).

4. The automatic deviation correction system according to claim 1, 2 or 3, characterized in that: A relatively stationary central platform is arranged in the middle of the turntable (2000), wherein the first detection module and the second detection module are both fixed on the central platform, and each of the workstations is provided with a workstation cavity (2200) for accommodating a connector.

5. The automatic deviation correction system according to claim 4, characterized in that: The connector at least comprises a body (100), a riveted terminal assembly located in the body and used for conducting electricity, and an end cover (300) connected to the body (100) and allowing the riveted terminal assembly to be partially exposed, wherein the riveted terminal assembly comprises a braided terminal and an accessory terminal riveted to the braided terminal, wherein the braided terminal comprises a contact portion (220) located at one end and a braided portion (240) located at the other end; and the matching terminal comprises a riveted cavity (260) located at one end, a matching column (280) located at the other end and hollow inside, and riveted sheets (290) located on both sides of the riveted cavity (260) and capable of wrapping the braided portion (240).

6. A method for automatically correcting the deviation of a connector terminal, characterized in that It includes the following steps: Step S100: First, an automatic deviation correction system for a connector is provided, which comprises: a turntable (2000) with a plurality of stations arranged at intervals around it, an automatic deviation correction device (3000) arranged on one side of the turntable (2000), a first detection module located on one side of the automatic deviation correction device (3000) and located for detection before deviation correction, and a second detection module located on the other side of the automatic deviation correction device (3000) and located for detection after deviation correction, wherein the automatic deviation correction device (3000) comprises a support frame (3200) with a bottom arranged on a horizontal plane, an X-axis linear module (3240) arranged on the support frame (3200) and with an output direction parallel to the horizontal plane, an X-axis motion unit (3260) pushed in the horizontal direction by the X-axis linear module (3240), and a second detection module arranged on the other side of the automatic deviation correction device (3000) and located for detection after deviation correction. The invention relates to a Z-axis linear module (3440) on a unit (3260), a Z-axis motion unit (3460) pushed by the Z-axis linear module (3440) in a direction perpendicular to a horizontal plane, a servo rotating shaft (3640) arranged on the Z-axis motion unit (3460), a rotating arm (3660) driven by the servo rotating shaft (3640) and rotating around a direction perpendicular to a horizontal plane, and a pair of clamping claws (3680) located at the end of the rotating arm (3660); wherein the connector at least comprises a body (100), a riveted terminal assembly located in the body and used for conducting electricity, and an end cover (300) connected to the body (100) and allowing the riveted terminal assembly to be partially exposed to the outside, wherein the riveted terminal assembly comprises a braided terminal and an accessory terminal riveted to the braided terminal; Step S200: then perform image recognition on the braided terminal in the connector to be corrected, and use a first detection module to detect whether the braided terminal image deviates from the preset image, if not, proceed to step S400, if yes, proceed to step S300; Step S300: Correct the braided terminal to be corrected and then apply downward force, that is, clamp the braided terminal with the clamping claw (3680) to perform a correction adjustment action and then apply downward force, and enter step S500; Step S400: Entering the station corresponding to the clamping claw (3680), the clamping claw (3680) applies downward force to the braided terminal without performing a deviation correction process, and then entering the station corresponding to the second detection module, and entering step S500; Step S500: Continue to perform image recognition again on the connector that has completed the correction, and use the second detection module to detect whether the braided terminal image deviates from the preset image. If not, proceed to the next process until the end. If yes, proceed to step S600; Step S600: terminating the deflection correction process, placing the connector that has not been successfully deflected into the unloading place for abnormal processing until the end.

7. The automatic deviation correction method according to claim 6, characterized in that: The first detection module includes a first detection support column (4200) arranged on the central platform, a first detection light source (4240) fixed on the first detection support column (4200) and capable of providing lighting function to the workstation cavity (2200), and a first image recognition unit (4260) for performing image recognition on the main body (100); and the second detection module includes a second detection support column (4400) arranged on the central platform, a second detection light source (4440) fixed on the second detection support column (4400) and capable of providing lighting function to the workstation cavity (2200), and a second image recognition unit (4460) for performing image recognition on the main body (100).

8. The automatic deviation correction method according to claim 6 or 7, characterized in that: The clamping claw (3680) is located between the first detection light source (4240) and the second detection light source (4440).

9. The automatic deviation correction method according to claim 8, characterized in that: A relatively stationary central platform is arranged in the middle of the turntable (2000), wherein the first detection module and the second detection module are both fixed on the central platform, and each of the workstations is provided with a workstation cavity (2200) for accommodating a connector.

10. The automatic deviation correction method according to claim 8, characterized in that: The braided terminal comprises a contact portion (220) located at one end and a braided portion (240) located at the other end; and the matching terminal comprises a riveting cavity (260) located at one end, a matching column (280) located at the other end and hollow inside, and riveting sheets (290) located at both sides of the riveting cavity (260) and capable of wrapping the braided portion (240).

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