Test plug structure and cable accessory composite interface electrical characteristic testing device

Abstract

The application is suitable for the field of cable accessory composite interface test, and provides a test plug structure and a cable accessory composite interface electrical characteristic test device, wherein the test plug structure comprises a mounting seat, a sleeve seat assembly, the sleeve seat assembly is installed on the mounting seat and can move along the axial direction of the mounting seat, a plurality of support arms are arranged at intervals along the circumferential direction of the sleeve seat assembly, a support joint is arranged between the support arm and the sleeve seat assembly, one end of the support joint is rotationally connected with the support arm, and the other end is rotationally connected with the sleeve seat assembly; when the sleeve seat assembly moves, the support joint is driven to rotate, the support joint drives the clamping ends of the plurality of support arms to move close to or away from each other, and is used for clamping the insulation sample. The test plug structure of the application not only facilitates the quick assembly and disassembly of the insulation sample, but also significantly improves the test efficiency and reduces the damage and loss of the insulation sample caused by frequent operation.

Description

Technical Field

[0001] This invention relates to the field of cable accessory composite interface testing, and in particular to a test insertion and removal structure and a device for testing the electrical characteristics of cable accessory composite interfaces. Background Technology

[0002] Cross-linked polyethylene (XLPE) cables are widely used in the power industry due to their excellent electrical properties. With the continuous advancement of urbanization, the demand for XLPE power cables and cable accessories is increasing. In long-term practical operation, cable accessories often have multi-layered insulation composite structures, and the performance of different insulation materials varies significantly, making cable accessories a weak link in the power transmission system.

[0003] During installation, when cable accessories are installed on cross-linked polyethylene cables, the contact surfaces between the two cannot be completely tightly connected, resulting in air gaps, impurities, and burrs. Partial discharge may occur at these locations.

[0004] In existing technologies, to test the electrical properties of the composite interface between cable accessories and cross-linked polyethylene (XLPE), insulation samples corresponding to the cable accessories and XLPE are typically fabricated first. These samples are then fixed using a fixing device. Some current fixing devices use multiple layers of acrylic panels, placing the insulation sample between adjacent layers and securing them with bolts. Others use multiple insulating rods to clamp and fix the insulation sample. However, existing fixing devices usually rely on manual adjustment of the bolts to clamp the insulation sample. This can lead to over- or under-clamping, resulting in inaccurate electrical property test results. Furthermore, the installation and removal of the insulation sample is inconvenient, and repeated testing can damage the insulation. Summary of the Invention

[0005] The purpose of this invention is to provide a testing device for the electrical characteristics of composite interfaces of test insertion and removal structures and cable accessories, in order to solve the above-mentioned technical problems existing in the prior art. The device mainly includes the following: The first aspect of this application provides a test insertion and removal structure, including: Mounting base; A sleeve assembly, which is mounted on the mounting base and is movable along the axial direction of the mounting base; Support arms, a plurality of support arms are arranged at circumferential intervals along the sleeve assembly, wherein each support arm includes a rotating end and a clamping end, and the support arm is rotatably connected to the mounting base through the rotating end; A support joint is provided between the support arm and the sleeve assembly, with one end of the support joint rotatably connected to the support arm and the other end rotatably connected to the sleeve assembly; When the sleeve assembly moves, it drives the support joint to rotate, and the support joint causes the clamping ends of the multiple support arms to move closer or further apart, for clamping the insulating sample.

[0006] To further improve the implementation of this application, the following configuration structure is specifically adopted: the sleeve assembly includes: a sleeve, a support frame, and a retractable member, wherein the support frame is located between the sleeve and the retractable member; One end of the retractable member is fixedly connected to the mounting base, and the other end is fixedly connected to the lower surface of the support frame. The upper surface of the support frame is connected to the sleeve, and the side wall of the support frame is rotatably connected to the support joint. When the sleeve moves, the support frame can drive the support joint to move closer or further apart.

[0007] To further improve the implementation of this application, the following structure is adopted: the side wall of the support frame is provided with a plurality of connecting parts, and the plurality of connecting parts are rotatably connected to each of the support joints.

[0008] Furthermore, to better realize this application, the following configuration structure is specifically adopted: the shrinking member includes a first shrinking member and a second shrinking member; The first shrink member is fixedly connected to the mounting base. The first shrink member has a shrink cavity, in which an elastic element is installed. One end of the second shrink member is inserted into the shrink cavity and connected to the elastic element, and the other end of the second shrink member is connected to the lower surface of the support frame.

[0009] To further improve the implementation of this application, the following configuration structure is specifically adopted: a clamping unit is installed on the clamping end of the support arm, and the clamping unit has a receiving cavity; when multiple support arms are close together, multiple clamping units are spliced ​​together to form a clamping member, and multiple receiving cavities constitute the clamping cavity of the clamping member.

[0010] To further improve the implementation of this application, the following configuration structure is adopted: the clamping unit includes a clamping part and a limiting part, the outer wall of the clamping part is connected to the clamping end, and the lower end of the clamping part is perpendicularly connected to the limiting part to define the receiving cavity.

[0011] To further improve the implementation of this application, the following structure is specifically adopted: the sleeve includes a support rod and a support member, one end of the support rod is connected to the upper surface of the support frame, and the other end is connected to the support member, the support member has a support cavity, and the support cavity communicates with the clamping cavity.

[0012] To further improve the implementation of this application, the following structure is specifically adopted: one end of the support joint is provided with a rotating groove, one end of the connecting part is inserted into the rotating groove, the other end of the support joint is provided with a limiting groove, the support arm passes through the limiting groove, and the support arm can rotate relative to the limiting groove.

[0013] To further improve the implementation of this application, the following structure is specifically adopted: the support arm has a bent portion, which is connected to the support joint.

[0014] The second aspect of this application provides a test device for the electrical characteristics of composite interfaces of cable accessories, including the above-mentioned test insertion and removal structure.

[0015] Compared with the prior art, the present invention has at least the following technical effects: The test insertion and removal structure provided in this application is used to clamp insulation samples. It includes a mounting base, a sleeve assembly, multiple support arms, and multiple support joints. The sleeve assembly is mounted on the mounting base, and the multiple support arms are arranged circumferentially around the sleeve assembly. Each support arm is connected to the sleeve assembly via a corresponding support joint. When clamping an insulation sample, the end of the insulation sample enters the cavity of the sleeve assembly, and the sleeve assembly is moved closer to the mounting base. This, in turn, drives the support joints to move, causing the multiple support arms to move closer together, thus clamping the insulation sample. The sleeve assembly and clamping arms in this test insertion and removal structure can be used to clamp insulation samples of different specifications without damaging the surface of the insulation sample. Furthermore, this test insertion and removal structure not only facilitates rapid assembly and disassembly of insulation samples but also significantly improves testing efficiency, reduces damage and wear to the insulation sample caused by frequent operations, and extends the service life of the insulation sample and the test insertion and removal structure. It provides a more scientific, accurate, and efficient solution for testing the electrical characteristics of composite interfaces in cable accessories, avoiding any impact on the accuracy of test results. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional structural diagram of the experimental insertion and removal structure in this application; Figure 2 This is a top view of the experimental insertion and removal structure in this application; Figure 3 yes Figure 2 Cross-sectional view along the AA direction; Figure 4 This is a schematic diagram of the support frame in this application; Figure 5 This is a schematic diagram of the clamping unit in this application; Figure 6 This is a schematic diagram of the supporting joint structure in this application; Figure 7 This is a three-dimensional structural diagram of the testing device in this application; Figure 8 This is a top view of the test apparatus in this application; Figure 9 yes Figure 8 Cross-sectional view along the BB direction.

[0018] In the picture: 100. Test insertion and removal structure; 10. Mounting base; 20. Sleeve assembly; 21. Sleeve; 211. Support rod; 212. Support component; 2121. Support cavity; 22. Support frame; 221. Connecting part; 23. Shrinkage component; 30. Support arm; 31. Rotating end; 32. Clamping end; 33. Clamping component; 331. Clamping unit; 3311. Receiving cavity; 3312. Clamping part; 3313. Limiting part; 34. Clamping cavity; 35. Bending part; 40. Support joint; 41. Rotation groove; 42. Limiting groove; 200. Insulation test specimen; 300. Insulating cylinder; 400. Low-voltage components; 500. High-voltage components; 1000. Test apparatus. Detailed Implementation

[0019] The following description provides many different embodiments or examples for implementing various features of this application. The elements and arrangements described in the specific examples below are only for concise expression of this application and are merely examples, not intended to limit this application.

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to represent selected embodiments of this application.

[0021] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, the terms "first," "second," "third," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0022] In this application, unless otherwise expressly specified and limited, "above or below" a first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" a first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" a first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] In existing technologies, to test the electrical properties of the composite interface between cable accessories and cross-linked polyethylene (XLPE), insulation samples corresponding to the cable accessories and XLPE are typically fabricated first. These samples are then fixed using a fixing device. Some current fixing devices use multiple layers of acrylic panels, placing the insulation sample between adjacent layers and securing them with bolts. Others use multiple insulating rods to clamp and fix the insulation sample. However, existing fixing devices usually rely on manual adjustment of the bolts to tighten the insulation sample. This can lead to over- or under-clamping, resulting in inaccurate electrical property test results. Furthermore, the installation and removal of the insulation sample is inconvenient, and repeated testing can damage or deplete the insulation.

[0024] Example 1: Therefore, Embodiment 1 of this application provides a test insertion / removal structure, such as... Figures 1-6 As shown, it includes: Mounting base 10 is used to detachably mount the test insertion and removal structure 100 in the cable accessory composite interface electrical characteristic testing device 1000, in which the test insertion and removal structure 100 clamps the insulation sample 200 in the testing device 1000. For example, the mounting base 10 can be detachably mounted in the testing device 1000 by means of bolts.

[0025] In some alternative embodiments, the mounting base 10 can be configured as a mounting plate structure, and the mounting base 10 can be configured as a square, rectangle, etc., without limitation. In this application, the mounting base 10 is configured as a circle to adapt to the shape of the test device 1000.

[0026] A sleeve assembly 20 is mounted on the mounting base 10, and the sleeve assembly 20 is movable along the axial direction of the mounting base 10, where the axial direction can be understood as... Figure 1 The up and down directions in the middle.

[0027] For example, one end of the sleeve assembly 20 is connected to the mounting base 10 via a shrink member 23, and the other end is a free end with a cavity that can accommodate the end of the insulating sample 200. The end of the insulating sample 200 can be installed in the free end of the sleeve assembly 20. During the installation of the insulating sample 200, a downward force is applied to the sleeve assembly 20, causing the sleeve assembly 20 to move closer to the mounting base 10. After the insulating sample 200 is removed, the sleeve assembly 20 moves away from the mounting base 10 under the force of the shrink member 23, returning to its initial state. In this application, the diameter of the sleeve assembly 20 is greater than or equal to the maximum diameter of the ends of multiple insulating samples 200 of different specifications, making the sleeve assembly 20 suitable for accommodating insulating samples of different specifications, thus having a wide range of applications.

[0028] Support arms 30 are arranged circumferentially around the sleeve assembly 20, meaning that multiple support arms 30 surround the sleeve assembly 20, placing the sleeve assembly 20 within a space defined by the multiple support arms 30. This facilitates the smooth entry of the insulating sample 200 into the sleeve assembly 20 through the space defined by the multiple support arms 30. Each support arm 30 includes a rotating end 31 and a clamping end 32. The support arm 30 is rotatably connected to the mounting base 10 via the rotating end 31. For example, a rotating component is mounted on the mounting base 10, and the rotating end 31 of the support arm 30 is rotatably connected to the rotating component via a pin. The clamping end 32 of the support arm 30 is a free end, located away from the mounting base 10 and above the sleeve assembly 20, used to clamp the insulating sample 200. In this application, multiple support arms 30 are used, and the clamping of the insulating sample 200 is achieved by the multiple support arms 30 being close to each other. The multiple support arms 30 can clamp insulating samples 200 of different specifications.

[0029] In some alternative embodiments, the number of support arms 30 is 2, 3, 4, etc., and in this application, the number of support arms 30 is preferably 3.

[0030] A support joint 40 is disposed between the support arm 30 and the sleeve assembly 20. One end of the support joint 40 is rotatably connected to the support arm 30, and the other end is rotatably connected to the sleeve assembly 20. For example, one end of the support joint 40 is rotatably connected to the support arm 30 near its lower end, and the other end is rotatably connected to the sleeve assembly 20 near its mounting base 10. The support joint 40 is tilted towards the mounting base 10, which allows the sleeve assembly 20 to pull the support joint 40 with a small force, thereby causing the multiple support arms 30 to move closer together to clamp the insulating sample 200. This also prevents the support joint 40 from jamming during movement.

[0031] When the sleeve assembly 20 moves, it drives the support joint 40 to rotate. The support joint 40 causes the clamping ends 32 of the multiple support arms 30 to move closer or further apart to clamp the insulating sample 200. For example, when the test insertion / removal structure is in its initial state, the sleeve assembly 20 is positioned away from the mounting base 10, and the multiple support arms 30 are in an open state away from the sleeve assembly 20. When it is necessary to clamp the insulating sample 200, the end of the insulating sample 200 enters the cavity of the end of the sleeve assembly 20 away from the mounting base 10. The insulating sample 200 then exerts a downward force on the sleeve assembly 20. Under this force, the sleeve assembly 20 moves closer to the mounting base 10, simultaneously driving the multiple support joints 40 to move closer to the mounting base 10. The multiple support joints 40 drive the corresponding multiple support arms 30 to move closer to the sleeve assembly 20, clamping the insulating sample 200. The disassembly process of the insulating sample 200 is the reverse of the installation process and will not be described in detail here.

[0032] Therefore, the test insertion and removal structure 100 provided in this application is used to clamp an insulating sample 200, including a mounting base 10, a sleeve assembly 20, multiple support arms 30, and multiple support joints 40. The sleeve assembly 20 is disposed on the mounting base 10, and the multiple support arms 30 are arranged at intervals along the circumference of the sleeve assembly 20, and each support arm 30 is connected to the sleeve assembly 20 through a corresponding support joint 40. When it is necessary to clamp the insulating sample 200, the end of the insulating sample 200 enters the cavity of the sleeve assembly 20, and the sleeve assembly 20 is moved towards the mounting base 10. Then, by driving the support joints 40 to move, the multiple support arms 30 are moved closer to each other, thereby clamping the insulating sample 200. The sleeve assembly 20 and support arm 30 in the test insertion and removal structure 100 of this application can be used to clamp insulation samples 200 of different specifications without damaging the surface of the insulation sample 200. At the same time, the test insertion and removal structure 100 not only facilitates the quick assembly and disassembly of the insulation sample 200, but also significantly improves the testing efficiency, reduces the damage and wear of the insulation sample 200 caused by frequent operation, and extends the service life of the insulation sample 200 and the test insertion and removal structure 100. It provides a more scientific, accurate and efficient solution for testing the electrical characteristics of composite interfaces of cable accessories, and avoids affecting the accuracy of test results.

[0033] According to some optional embodiments, the sleeve assembly 20 is vertically mounted on the mounting base 10 and coaxially arranged with the mounting base 10. The sleeve assembly 20 includes: a sleeve 21, a support frame 22, and a shrink member 23, wherein the support frame 22 is located between the sleeve 21 and the shrink member 23, and the three are coaxially arranged. The sleeve 21 has a cavity for accommodating the end of the insulating sample 200 in the direction away from the mounting base 10.

[0034] One end of the retractable member 23 is fixedly connected to the mounting base 10, and the other end is fixedly connected to the lower surface of the support frame 22. The retractable member 23 can extend and retract axially. The initial height of the retractable member 23 in the vertical direction is the movable stroke of the sleeve assembly 20 relative to the mounting base 10. The upper surface of the support frame 22 is connected to the sleeve 21 to provide support force for the sleeve 21 to support the insulating sample 200. The side wall of the support frame 22 is rotatably connected to one end of the support joint 40. When the sleeve 21 moves, the support frame 22 can drive the support joint 40 to move closer or further away from each other. For example, the side wall of the support frame 22 is the wall close to the support joint 40. The support frame 22 is a disc, and multiple connecting parts are provided on the side wall of the disc. Each connecting part is correspondingly provided to the support joint 40. When the support frame 22 moves axially, it can ensure that multiple support joints 40 are also driven to move axially at the same time, thereby driving multiple support arms 30 to move closer or further away from each other.

[0035] According to some alternative embodiments, the side wall of the support frame 22 is provided with a plurality of connecting parts 221, and the plurality of connecting parts 221 are rotatably connected to each of the support joints 40.

[0036] In some alternative embodiments, the number of connecting portions 221 corresponds to the number of supporting joints 40. Each connecting portion 221 is a connecting rod, with one end fixedly connected to the lower end of the sleeve 21 and the other end rotatably connected to the end of the supporting joint 40. The connecting portions 221 extend horizontally, ensuring that the supporting joint 40 has sufficient rotational space and avoiding interference with the sleeve 21 or the retractable member 23.

[0037] According to some alternative embodiments, the shrink member 23 includes a first shrink member and a second shrink member; The first shrinkable member is fixedly connected to the mounting base 10. The first shrinkable member has a shrinkage cavity in which an elastic element is installed. One end of the second shrinkable member is inserted into the shrinkage cavity and connected to the elastic element, and the other end of the second shrinkable member is connected to the lower surface of the support frame 22. For example, both the first and second shrinkable members can be tubular, and the elastic element can be a spring. The second shrinkable member moves up and down along the shrinkage cavity of the first shrinkable member, thereby realizing the axial movement of the sleeve 21 and enabling the sleeve 21 to automatically return to its initial state.

[0038] In some alternative embodiments, the retractor 23 may be a spring.

[0039] According to some optional embodiments, a clamping unit 331 is installed on the clamping end 32 of the support arm 30, and the clamping unit 331 has a receiving cavity 3311; when multiple support arms 30 are close together, multiple clamping units 331 are spliced ​​to form a clamping member 33, and multiple receiving cavities 3311 form the clamping cavity 34 of the clamping member 33. The insulating sample 200 passes through the clamping cavity 34 and is clamped by the clamping member 33. The clamping member 33 formed by splicing multiple clamping units 331 and the clamping cavity 34 of the clamping member 33 can clamp insulating samples 200 of different specifications, and has a wide range of applications.

[0040] In the above scheme, multiple clamping units 331 are joined together to form a clamping member 33, which is circular, and the clamping cavity 34 is also circular. In some optional embodiments, the shapes of the clamping member 33 and the clamping cavity 34 match the shape of the outer wall of the clamping position of the insulating sample 200.

[0041] According to some alternative embodiments, the clamping unit 331 includes a clamping part 3312 and a limiting part 3313. The outer wall of the clamping part 3312 is fixedly connected to the clamping end 32. The lower end of the clamping part 3312 is perpendicularly connected to the limiting part 3313 to define the receiving cavity 3311. The perpendicular connection between the lower end of the clamping part 3312 and the limiting part 3313 forms a limiting step.

[0042] In the above scheme, the clamping part 3312 is a ring structure, which is suitable for the outer wall shape of the insulating sample 200. The limiting part 3313 can abut against the protrusion on the outer wall of the insulating sample 200 to avoid the insulating sample 200 applying too much force to the sleeve assembly 20, causing the sleeve assembly 20 to be unable to return to the initial state.

[0043] In some alternative embodiments, the clamping part 3312 and the limiting part 3313 are integrally formed.

[0044] According to some optional embodiments, the sleeve 21 includes a support rod 211 and a support member 212. One end of the support rod 211 is connected to the upper surface of the support frame 22, and the other end is fixedly connected to the support member 212. The end of the support member 212 away from the support rod 211 has an opening. The support member 212 has a support cavity 2121, which communicates with the clamping cavity 34. This allows the insulating sample 200 to enter the support cavity 2121 through the clamping cavity 34, so that the insulating sample 200 is subjected to a horizontal clamping force in the clamping cavity 34 and a vertical supporting force from the support cavity 2121. Together, these forces ensure the stability of the insulating sample 200 in the testing device 1000 and guarantee the smooth progress of the test.

[0045] In some alternative embodiments, the support rod 211 and the support member 212 can be detachably connected or integrally formed, and there is no limitation on this.

[0046] According to some optional embodiments, one end of the support joint 40 is provided with a rotating groove 41, one end of the connecting part 221 is inserted into the rotating groove 41, and the other end of the support joint 40 is provided with a limiting groove 42. The support arm 30 passes through the limiting groove 42 and can rotate relative to the limiting groove 42. At the same time, the rotation range of the support arm 30 is limited to avoid excessive rotation and failure to reset.

[0047] In the above scheme, one end of the connecting part 221 can be connected to the support joint 40 through a rotating shaft, and the end of the support joint 40 can also be connected to the support arm 30 through a rotating shaft.

[0048] According to some alternative embodiments, the support arm 30 has a bent portion 35 connected to the support joint 40. The support arm 30 is in the shape of a less than sign, and the bent portion 35 allows the clamping end 32 of the support arm 30 to be close to the sleeve assembly 20. In this way, the sleeve assembly 20 only needs to move a small distance axially to achieve clamping of the insulating sample 200 by the clamping units 331 of the multiple clamping ends 32.

[0049] Example 2 Embodiment 2 of this application provides a cable accessory composite interface electrical characteristic testing device 1000, such as... Figures 1-9 As shown, it includes the aforementioned test insertion / removal structure 100.

[0050] In the above scheme, the testing device 1000 includes an insulating cylinder 300, with a low-voltage component 400 and a high-voltage component 500 respectively installed at both ends of the insulating cylinder 300. There are two test insertion and removal structures 100, which are arranged opposite to each other and can be detachably installed on the inner walls of the low-voltage component 400 and the high-voltage component 500 respectively through the mounting base 10. The two ends of the insulating sample 200 are respectively inserted into the corresponding test insertion and removal structures 100 for clamping.

[0051] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A test insertion / removal structure, characterized in that, include: Mounting bracket (10); A sleeve assembly (20) is mounted on the mounting base (10) and is movable along the axial direction of the mounting base (10); Support arms (30), a plurality of support arms (30) are arranged circumferentially at intervals along the sleeve assembly (20), wherein each support arm (30) includes a rotating end (31) and a clamping end (32), and the support arm (30) is rotatably connected to the mounting base (10) through the rotating end (31); the support arm (30) has a bent portion (35), and the bent portion (35) is connected to a support joint (40); A support joint (40) is disposed between the support arm (30) and the sleeve assembly (20). One end of the support joint (40) is rotatably connected to the support arm (30), and the other end is rotatably connected to the sleeve assembly (20). When the insulating specimen (200) applies force to the sleeve assembly (20) to move it, it drives the support joint (40) to rotate. The support joint (40) drives the clamping ends (32) of the multiple support arms (30) to move closer or further apart to clamp the insulating specimen (200). The sleeve assembly (20) includes: a sleeve (21), a support frame (22), and a retractable member (23), wherein the support frame (22) is located between the sleeve (21) and the retractable member (23); One end of the shrinking member (23) is fixedly connected to the mounting base (10), and the other end is fixedly connected to the lower surface of the support frame (22). The upper surface of the support frame (22) is connected to the sleeve (21), and the side wall of the support frame (22) is rotatably connected to the support joint (40). When the sleeve (21) moves, it can drive the support joint (40) to move closer or further away from each other through the support frame (22).

2. The test insertion / removal structure as described in claim 1, characterized in that, The support frame (22) has a plurality of connecting parts (221) on its side wall, and the plurality of connecting parts (221) are rotatably connected to each of the support joints (40).

3. The test insertion / removal structure as described in claim 2, characterized in that, The shrinkable component (23) includes a first shrinkable component and a second shrinkable component; The first shrinking member is fixedly connected to the mounting base (10). The first shrinking member has a shrinking cavity, in which an elastic member is installed. One end of the second shrinking member is inserted into the shrinking cavity and connected to the elastic member. The other end of the second shrinking member is connected to the lower surface of the support frame (22).

4. The test insertion / removal structure as described in claim 1, characterized in that, A clamping unit (331) is installed on the clamping end (32) of the support arm (30), and the clamping unit (331) has a receiving cavity (3311); when multiple support arms (30) are close together, multiple clamping units (331) are spliced ​​together to form a clamping member (33), and multiple receiving cavities (3311) form the clamping cavity (34) of the clamping member (33).

5. The test insertion / removal structure as described in claim 4, characterized in that, The clamping unit (331) includes a clamping part (3312) and a limiting part (3313). The outer wall of the clamping part (3312) is connected to the clamping end (32). The lower end of the clamping part (3312) is vertically connected to the limiting part (3313) to define the receiving cavity (3311).

6. The test insertion / removal structure as described in claim 4, characterized in that, The sleeve (21) includes a support rod (211) and a support member (212). One end of the support rod (211) is connected to the upper surface of the support frame (22), and the other end is connected to the support member (212). The support member (212) has a support cavity (2121), which is connected to the clamping cavity (34).

7. The test insertion / removal structure as described in claim 2, characterized in that, One end of the support joint (40) is provided with a rotating groove (41), one end of the connecting part (221) is inserted into the rotating groove (41), and the other end of the support joint (40) is provided with a limiting groove (42). The support arm (30) passes through the limiting groove (42) and the support arm (30) can rotate relative to the limiting groove (42).

8. A test device for the electrical characteristics of composite interfaces of cable accessories, characterized in that, Includes the test insertion / removal structure as described in any one of claims 1-7.

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