Arcing horn assembly and insulator

By using a single bolt and nut connection in the arc angle assembly and setting a stop structure between the arc angle body and the connecting part, the deflection problem caused by the bolt loosening is solved, and better anti-loosening is achieved The effect ensures the normal operation of overhead transmission lines.

CN222126144UActive Publication Date: 2024-12-06JIANGDONG FITTINGS EQUIP
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Patent Information

Application Number
CN202420107859.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-01-16
Publication Date
2024-12-06
Estimated Expiration
2034-01-16

AI Technical Summary

Technical Problem

In the prior art, the arc angle is deflected due to loose bolts, which affects the normal operation of the overhead transmission line.

Method used

An arc angle component is designed, which uses a single bolt and a nut to connect, and a stop-rotation structure is set between the arc angle body and the connector. The stop-rotation structure avoids the rotation of the bolts and achieves an anti-loosening effect.

Benefits of technology

Effectively prevent the deflection of the arc angle relative to the insulator string, ensure the normal operation of the overhead transmission line, and there will be no loosening problems when used for a long time, and the anti-loosening effect is better.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides an arcing horn assembly and an insulator. The arcing horn assembly is used for being connected with a to-be-installed product and comprises an arcing horn body provided with a first connecting hole; a connecting piece; the anti-falling piece and the connecting piece are located on the two opposite sides of the arcing horn body, a gap used for containing at least part of a to-be-installed product is defined between the anti-falling piece and the arcing horn body, and the connecting piece penetrates through the first connecting hole and the to-be-installed product and is in threaded connection with the anti-falling piece; and a rotation stopping structure is arranged between the arcing horn body and the connecting piece. The technical scheme of the utility model can prevent the bolt from loosening, thereby ensuring the normal operation of the overhead transmission line.
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Description

Technical Field

[0001] The utility model relates to the technical field of insulators, and in particular to an arcing horn component and an insulator. Background Art

[0002] Arcing horns, also known as angle gaps, are protective fittings for insulators on overhead transmission lines. They are installed at the ends of insulator strings with a certain arcing gap. They are angular protective fittings used to prevent arc flashover along insulators. Therefore, arcing fittings play an important role in overhead transmission lines.

[0003] At present, in the prior art, the arcing angle is mainly fixed to the ball head hanging plate or the bowl head hanging plate of the insulator string by bolts. However, due to long-term operation or improper installation, the nuts may become loose, causing the arcing angle to deflect, changing the arcing gap, and even causing the arcing angle to deflect and hit the insulator, causing a significant impact on the insulator, thereby affecting the normal operation of the overhead transmission line. Utility Model Content

[0004] The main purpose of the utility model is to provide an arcing horn assembly and an insulator, which can solve the problem in the prior art that the arcing horn is deflected due to loose bolts, thereby affecting the normal operation of the overhead transmission line.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, there is provided an arcing horn assembly for connecting with a product to be installed, the arcing horn assembly comprising: an arcing horn body, which is provided with a first connecting hole; a connecting piece; an anti-slip piece, the anti-slip piece and the connecting piece are located on opposite sides of the arcing horn body, a gap for accommodating at least part of the product to be installed is defined between the anti-slip piece and the arcing horn body, the connecting piece passes through the first connecting hole and the product to be installed and is threadedly connected to the anti-slip piece; a first anti-rotation structure, a first anti-rotation structure is provided between the arcing horn body and the connecting piece.

[0006] Furthermore, the first anti-rotation structure includes a first anti-rotation protrusion and a first anti-rotation groove that matches the first anti-rotation protrusion.

[0007] Furthermore, the arcing horn assembly also includes a gasket arranged on one side of the arcing horn body, one side of the gasket is engaged with the connecting piece for anti-rotation, and the other side of the gasket is engaged with the arcing horn body for anti-rotation through a first anti-rotation structure, and a second connecting hole is opened on the gasket for the connecting piece to pass through.

[0008] Furthermore, the first anti-rotation protrusion is arranged on one of the gasket and the arcing horn body, and the first anti-rotation groove is opened on the other of the gasket and the arcing horn body.

[0009] Furthermore, the gasket includes: a gasket body, which is provided with a second connecting hole; and a plurality of anti-rotation members, which are arranged at intervals along the circumference of the gasket body, and the anti-rotation members are constructed to be able to be bent relative to the gasket body.

[0010] Furthermore, the connecting member includes a threaded rod segment and an end cap connected to the threaded rod segment, the outer diameter of the end cap is larger than the outer diameter of the threaded rod segment, and the anti-rotation member is rotatably arranged relative to the gasket body to have a anti-rotation position abutting against the outer peripheral surface of the end cap and a release position separated from the outer peripheral surface of the end cap.

[0011] Furthermore, the gasket is made of stainless steel, and the thickness of the gasket is 1 mm to 2 mm.

[0012] Furthermore, the depth of the first anti-rotation protrusion is 1.5 mm to 2 mm, and the width of the first anti-rotation protrusion is 3 mm to 4 mm.

[0013] According to another aspect of the utility model, an insulator is provided, comprising an insulator body and the above-mentioned arcing horn assembly, the insulator body comprising a mounting member, the mounting member is located in the interval, and a third connecting hole for a connecting member to pass through is formed on the mounting member.

[0014] Further, a second anti-rotation structure is provided between the mounting member and the anti-slip member, the second anti-rotation structure includes a second anti-rotation protrusion and a second anti-rotation groove which cooperates with the second anti-rotation protrusion, the second anti-rotation protrusion is provided on one of the mounting member and the anti-slip member, and the second anti-rotation groove is provided on the other of the mounting member and the anti-slip member; and / or, a second anti-rotation structure is provided between the mounting member and the arcing horn body, the second anti-rotation structure includes a second anti-rotation protrusion and a second anti-rotation groove which cooperates with the second anti-rotation protrusion, the second anti-rotation protrusion is provided on one of the mounting member and the arcing horn body, and the second anti-rotation groove is provided on the other of the mounting member and the arcing horn body.

[0015] According to the technical solution of the utility model, the connecting member is a bolt, the anti-slip member is a nut, the bolt passes through the first connecting hole and the product to be installed and is threadedly connected to the nut, so that the arcing horn body and the product to be installed can be fixedly connected. By providing a first anti-rotation structure between the arcing horn body and the connecting member, the arcing horn body and the connecting member are mutually constrained, which can prevent the bolt from rotating relative to the arcing horn body, thereby achieving the effect of anti-rotation and anti-loosening. Compared with the solution of using multiple bolts to achieve anti-loosening in the prior art, the present application only uses a single bolt and nut connection to achieve anti-loosening, and there will be no loosening problem after long-term use, and the anti-loosening effect is better, thereby preventing the arcing horn from deflecting relative to the insulator string and ensuring the normal operation of the overhead transmission line. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 The figure shows the assembly diagram of the arcing horn assembly and the mounting member of the embodiment of the utility model;

[0018] Figure 2 A schematic assembly diagram of the arcing horn assembly and the mounting member at another angle is shown in an embodiment of the utility model.

[0019] The above drawings include the following reference numerals:

[0020] 1. Connecting piece; 2. Gasket; 21. Second connecting hole; 22. Gasket body; 23. Anti-rotation piece; 3. Arcing horn body; 31. First connecting hole; 4. Mounting piece; 41. Third connecting hole; 5. Anti-slip piece; 6. First anti-rotation structure; 61. First anti-rotation protrusion; 62. First anti-rotation groove; 7. Second anti-rotation structure; 71. Second anti-rotation protrusion; 72. Second anti-rotation groove. DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0022] See also Figure 1 and Figure 2 As shown, the utility model provides an arcing horn assembly for connecting to a product to be installed, comprising: an arcing horn body 3, which is provided with a first connecting hole 31; a connecting piece 1; an anti-slipping piece 5, wherein the anti-slipping piece 5 and the connecting piece 1 are located on opposite sides of the arcing horn body 3, and a gap for accommodating at least part of the product to be installed is defined between the anti-slipping piece 5 and the arcing horn body 3, and the connecting piece 1 passes through the first connecting hole 31 and the product to be installed and is threadedly connected to the anti-slipping piece 5; a first anti-rotation structure 6, and a first anti-rotation structure 6 is provided between the arcing horn body 3 and the connecting piece 1.

[0023] It should be noted that the product to be installed is generally a ball head hanging plate or a bowl head hanging plate or a connecting plate on an insulator string.

[0024] In the above technical solution, the connecting member 1 is a bolt, the anti-slip member 5 is a nut, the bolt passes through the first connecting hole 31 and the product to be installed and is threadedly connected to the nut, so that the arcing horn body 3 and the product to be installed can be fixedly connected. By arranging the first anti-rotation structure 6 between the arcing horn body 3 and the connecting member 1, the arcing horn body 3 and the connecting member 1 are mutually restricted, which can prevent the bolt from rotating relative to the arcing horn body 3, thereby achieving the effect of anti-rotation and anti-loosening.

[0025] Through the above-mentioned arrangement, compared with the solution of using multiple bolts to achieve anti-loosening in the prior art, the present application only uses a single bolt and nut connection to achieve anti-loosening, and there will be no loosening problem after long-term use. The anti-loosening effect is better, thereby preventing the arcing angle from deflecting relative to the insulator string and ensuring the normal operation of the overhead transmission line.

[0026] like Figure 1 and Figure 2 As shown, in the embodiment of the present utility model, the first anti-rotation structure 6 includes a first anti-rotation protrusion 61 and a first anti-rotation groove 62 which is matched with the first anti-rotation protrusion 61 in a concave-convex manner.

[0027] Through the above arrangement, one of the first anti-rotation protrusion 61 and the first anti-rotation groove 62 is directly or indirectly arranged on the connecting member 1, and the other of the first anti-rotation protrusion 61 and the first anti-rotation groove 62 is directly or indirectly arranged on the arcing horn body 3. There are two first anti-rotation protrusions 61 and two first anti-rotation grooves 62, and the two first anti-rotation protrusions 61 correspond to the two first anti-rotation grooves 62. The relative rotation between the connecting member 1 and the arcing horn body 3 can be avoided by the concave-convex matching of the first anti-rotation protrusion 61 and the first anti-rotation groove 62.

[0028] like Figure 1 and Figure 2 As shown, in an embodiment of the utility model, the arcing horn assembly also includes a gasket 2 arranged on one side of the arcing horn body 3, one side of the gasket 2 is anti-rotationally matched with the connecting piece 1, and the other side of the gasket 2 is anti-rotationally matched with the arcing horn body 3 through a first anti-rotation structure 6, and a second connecting hole 21 is opened on the gasket 2 for the connecting piece 1 to pass through.

[0029] Through the above arrangement, the gasket 2 can play a role in increasing the friction force, ensuring a tight connection between the connecting member 1 and the arcing horn body 3, and further preventing the connecting member 1 from loosening.

[0030] like Figure 1 and Figure 2 As shown, in the embodiment of the present utility model, the first anti-rotation protrusion 61 is arranged on one of the gasket 2 and the arcing horn body 3, and the first anti-rotation groove 62 is opened on the other of the gasket 2 and the arcing horn body 3.

[0031] In the above technical solution, the first anti-rotation protrusion 61 is arranged on the lower end surface of the gasket 2, and the first anti-rotation groove 62 is provided on the upper end surface of the arcing horn body 3. The first anti-rotation protrusion 61 and the first anti-rotation groove 62 are matched with each other to play the role of anti-rotation. There are two first anti-rotation grooves 62 and both are connected to the first connecting hole 31. There are also two first anti-rotation protrusions 61, and the first anti-rotation protrusions 61 extend from the inner edge of the gasket 2 to the outer edge of the gasket 2.

[0032] In another embodiment of the present invention, the first anti-rotation protrusion 61 is arranged on the upper end surface of the arcing horn body 3 , and the first anti-rotation groove 62 is opened on the lower end surface of the gasket 2 .

[0033] like Figure 1 and Figure 2 As shown, in an embodiment of the utility model, the gasket 2 includes: a gasket body 22, which is provided with a second connecting hole 21; a plurality of stoppers 23, which are arranged at intervals along the circumference of the gasket body 22, and the stoppers 23 are constructed to be able to be bent relative to the gasket body 22.

[0034] In the above technical solution, the second connecting hole 21 is used to avoid the connecting member 1, there are two stoppers 23, the two stoppers 23 are evenly spaced along the circumference of the gasket body 22, and the stoppers 23 protrude from the gasket body 22 along the radial direction of the gasket 2.

[0035] Through the above-mentioned arrangement, the stop member 23 is bent relative to the gasket body 22, that is, there is an angle between the stop member 23 and the gasket body 22, and the stop member 23 is tightly attached to the outer peripheral surface of the connecting member 1, and can limit the connecting member 1 on the opposite sides of the connecting member 1 to prevent the connecting member 1 from rotating relative to the gasket 2, thereby realizing the stop-rotation fit between the connecting member 1 and the gasket 2. Due to the stop-rotation fit between the gasket 2 and the arcing horn body 3, the stop-rotation between the connecting member 1 and the arcing horn body 3 is realized.

[0036] like Figure 1 and Figure 2 As shown, in an embodiment of the utility model, the connecting member 1 includes a threaded rod segment and an end cap connected to the threaded rod segment, the outer diameter of the end cap is larger than the outer diameter of the threaded rod segment, and the anti-rotation member 23 is rotatably arranged relative to the gasket body 22 to have a anti-rotation position abutting against the outer peripheral surface of the end cap and a release position separated from the outer peripheral surface of the end cap.

[0037] In the above technical solution, the end of the threaded rod passes through the second connecting hole 21, the first connecting hole 31 and the product to be installed in sequence and is connected to the anti-slip component 5. The end cap is a hexagonal prism structure, and the two anti-rotation components 23 correspond to and fit with the two oppositely arranged end caps of the hexagonal prism structure one by one, which can prevent the connecting component 1 from rotating relative to the gasket 2, thereby realizing the anti-rotation fit between the connecting component 1 and the gasket 2.

[0038] like Figure 1 and Figure 2 As shown, in the embodiment of the present utility model, the gasket 2 is made of stainless steel, and the thickness of the gasket 2 is 1 mm to 2 mm.

[0039] Through the above arrangement, on the one hand, the strength of the gasket 2 can be ensured, and on the other hand, the gasket 2 has a certain deformation ability to ensure that the two stoppers 23 on the gasket 2 can be bent relative to the gasket body 22.

[0040] like Figure 1 and Figure 2 As shown, in the embodiment of the present utility model, the depth of the first anti-rotation protrusion 61 (ie, the depth of the first anti-rotation protrusion 61 along the Figure 2 The height in the vertical direction) is 1.5mm to 2mm, and the width of the first anti-rotation protrusion 61 is 3mm to 4mm.

[0041] Accordingly, the depth of the first anti-rotation groove 62 is 1.5 mm to 2 mm, and the width of the first anti-rotation groove 62 is 3 mm to 4 mm.

[0042] like Figure 1 and Figure 2 As shown, the utility model also provides an insulator, including an insulator body and the above-mentioned arcing horn assembly, the insulator body includes a mounting member 4, the mounting member 4 is located in the interval, and a third connecting hole 41 for the connecting member 1 to pass through is opened on the mounting member 4.

[0043] It should be noted that Figure 1 Only the mounting member 4 of the insulator is shown, and other structures of the insulator are not shown.

[0044] In the above technical solution, the mounting member 4 is a ball head hanging plate or a bowl head hanging plate or a connecting plate, and the connecting member 1 can connect the mounting member 4 with the arcing horn body 3, thereby connecting the arcing horn assembly and the insulator body.

[0045] like Figure 1 and Figure 2 As shown, in an embodiment of the utility model, a second anti-rotation structure 7 is provided between the mounting member 4 and the anti-slip member 5, and the second anti-rotation structure 7 includes a second anti-rotation protrusion 71 and a second anti-rotation groove 72 which cooperates with the second anti-rotation protrusion 71. The second anti-rotation protrusion 71 is provided on one of the mounting member 4 and the anti-slip member 5, and the second anti-rotation groove 72 is provided on the other of the mounting member 4 and the anti-slip member 5.

[0046] In the above technical solution, the second anti-rotation protrusion 71 is arranged on the lower end surface of the mounting member 4, and the second anti-rotation groove 72 is provided on the upper end surface of the anti-slip member 5. There are two second anti-rotation protrusions 71 and two second anti-rotation grooves 72, and the two second anti-rotation protrusions 71 correspond to the two second anti-rotation grooves 72. The mounting member 4 and the anti-slip member 5 can be stopped from rotating by the concave-convex cooperation of the second anti-rotation protrusion 71 and the second anti-rotation groove 72.

[0047] In another embodiment of the present invention, the second anti-rotation protrusion 71 is arranged on the upper end surface of the anti-slip component 5 , and the second anti-rotation groove 72 is opened on the lower end surface of the mounting component 4 .

[0048] like Figure 1 and Figure 2As shown, in an embodiment of the utility model, a second anti-rotation structure 7 is provided between the mounting member 4 and the arcing horn body 3, and the second anti-rotation structure 7 includes a second anti-rotation protrusion 71 and a second anti-rotation groove 72 which is concave-convexly matched with the second anti-rotation protrusion 71, the second anti-rotation protrusion 71 is provided on one of the mounting member 4 and the arcing horn body 3, and the second anti-rotation groove 72 is provided on the other of the mounting member 4 and the arcing horn body 3.

[0049] In the above technical solution, the second anti-rotation protrusion 71 is arranged on the upper end surface of the mounting member 4, and the second anti-rotation groove 72 is provided on the lower end surface of the arcing horn body 3. There are two second anti-rotation protrusions 71 and two second anti-rotation grooves 72, and the two second anti-rotation protrusions 71 correspond to the two second anti-rotation grooves 72. The mounting member 4 and the arcing horn body 3 can be anti-rotated by the concave-convex cooperation of the second anti-rotation protrusion 71 and the second anti-rotation groove 72.

[0050] In another embodiment of the present invention, the second anti-rotation protrusion 71 is arranged on the lower end surface of the arcing horn body 3 , and the second anti-rotation groove 72 is opened on the upper end surface of the mounting member 4 .

[0051] In one embodiment of the present invention, the depth of the second anti-rotation protrusion 71 is 1.5 mm to 2 mm, and the width of the second anti-rotation protrusion 71 is 3 mm to 4 mm.

[0052] Accordingly, the depth of the second anti-rotation groove 72 is 1.5 mm to 2 mm, and the width of the second anti-rotation groove 72 is 3 mm to 4 mm.

[0053] The insulator of the utility model has all the technical features and all the technical effects of the above-mentioned arcing horn assembly, which will not be described in detail here.

[0054] In the embodiment of the utility model, the connector 1 and the gasket 2 are prevented from rotating by the anti-rotation piece 23, a first anti-rotation structure 6 is arranged between the gasket 2 and the arcing horn body 3, a second anti-rotation structure 7 is arranged between the arcing horn body 3 and the mounting piece 4, and a third anti-rotation structure 7 is arranged between the mounting piece 4 and the anti-slip piece 5. By the above-mentioned multiple anti-rotation methods cooperating with each other, the connector 1, the gasket 2, the arcing horn body 3, the mounting piece 4 and the anti-slip piece 5 are mutually restrained and prevented from rotating, thereby preventing the connector 1 and the anti-slip piece 5 from loosening, preventing the arcing horn body from deflecting relative to the insulator, and thereby ensuring the normal operation of the overhead transmission line.

[0055] From the above description, it can be seen that the above-mentioned embodiments of the utility model achieve the following technical effects: the connecting member is a bolt, the anti-slip member is a nut, the bolt passes through the first connecting hole and the product to be installed and is threadedly connected to the nut, so that the arcing horn body and the product to be installed can be fixedly connected. By setting a first anti-rotation structure between the arcing horn body and the connecting member, the arcing horn body and the connecting member are mutually constrained, which can prevent the bolt from rotating relative to the arcing horn body, thereby achieving the effect of anti-rotation and anti-loosening. Compared with the solution of using multiple bolts to achieve anti-loosening in the prior art, the present application only uses a single bolt and nut connection to achieve anti-loosening, and there will be no loosening problem after long-term use, and the anti-loosening effect is better, thereby preventing the arcing horn from deflecting relative to the insulator string and ensuring the normal operation of the overhead transmission line.

[0056] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0057] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0058] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An arcing horn assembly, characterized in that: Used to connect with the product to be installed, the arcing horn assembly includes: The arcing horn body (3) is provided with a first connecting hole (31); Connector (1); an anti-slip member (5), wherein the anti-slip member (5) and the connecting member (1) are located on opposite sides of the arcing horn body (3), a space for accommodating at least part of the product to be installed is defined between the anti-slip member (5) and the arcing horn body (3), and the connecting member (1) passes through the first connecting hole (31) and the product to be installed and is threadedly connected to the anti-slip member (5); A first anti-rotation structure (6) is provided between the arcing horn body (3) and the connecting member (1).

2. The arcing horn assembly according to claim 1, characterized in that: The first anti-rotation structure (6) comprises a first anti-rotation protrusion (61) and a first anti-rotation groove (62) which is matched with the first anti-rotation protrusion (61).

3. The arcing horn assembly according to claim 2, characterized in that: The arcing horn assembly further comprises a gasket (2) arranged on one side of the arcing horn body (3); one side of the gasket (2) is engaged with the connecting member (1) for rotation prevention; the other side of the gasket (2) is engaged with the arcing horn body (3) for rotation prevention via the first rotation prevention structure (6); and a second connecting hole (21) is provided on the gasket (2) for the connecting member (1) to pass through.

4. The arcing horn assembly according to claim 3, characterized in that: The first anti-rotation protrusion (61) is arranged on one of the gasket (2) and the arcing horn body (3), and the first anti-rotation groove (62) is opened on the other of the gasket (2) and the arcing horn body (3).

5. The arcing horn assembly according to claim 3, characterized in that: The gasket (2) comprises: The gasket body (22) is provided with the second connecting hole (21); A plurality of rotation stoppers (23) are arranged at intervals along the circumference of the gasket body (22); the rotation stoppers (23) are configured to be able to be bent relative to the gasket body (22).

6. The arcing horn assembly according to claim 5, characterized in that: The connecting member (1) comprises a threaded rod segment and an end cap connected to the threaded rod segment, the outer diameter of the end cap is larger than the outer diameter of the threaded rod segment, and the anti-rotation member (23) is rotatably arranged relative to the gasket body (22) to have an anti-rotation position abutting against the outer peripheral surface of the end cap and a release position separated from the outer peripheral surface of the end cap.

7. The arcing horn assembly according to claim 3, characterized in that: The gasket (2) is made of stainless steel, and the thickness of the gasket (2) is 1 mm to 2 mm.

8. The arcing horn assembly according to any one of claims 2 to 7, characterized in that: The depth of the first anti-rotation protrusion (61) is 1.5 mm to 2 mm, and the width of the first anti-rotation protrusion (61) is 3 mm to 4 mm.

9. An insulator, characterized in that: The invention comprises an insulator body and an arcing horn assembly as claimed in any one of claims 1 to 8, wherein the insulator body comprises a mounting member (4), the mounting member (4) is located in the interval, and a third connecting hole (41) is provided on the mounting member (4) for the connecting member (1) to pass through.

10. The insulator according to claim 9, characterized in that: A second anti-rotation structure (7) is provided between the mounting member (4) and the anti-slip member (5), the second anti-rotation structure (7) comprising a second anti-rotation protrusion (71) and a second anti-rotation groove (72) which is concavely matched with the second anti-rotation protrusion (71), the second anti-rotation protrusion (71) being provided on one of the mounting member (4) and the anti-slip member (5), and the second anti-rotation groove (72) being provided on the other of the mounting member (4) and the anti-slip member (5); and / or, A second anti-rotation structure (7) is provided between the mounting member (4) and the arcing horn body (3), the second anti-rotation structure (7) comprising a second anti-rotation protrusion (71) and a second anti-rotation groove (72) which is concavely matched with the second anti-rotation protrusion (71), the second anti-rotation protrusion (71) being provided on one of the mounting member (4) and the arcing horn body (3), and the second anti-rotation groove (72) being provided on the other of the mounting member (4) and the arcing horn body (3).