Composite insulating cross arm with anti-bending structure

Abstract

The utility model discloses a composite insulating cross arm with an anti-bending structure, and relates to the technical field of insulating cross arms, one end of the outer side of a composite core rod is wrapped with a thickness wrapping layer, the outer side of the thickness wrapping layer is sleeved with a fixing fitting, one end of the composite core rod is sleeved with a wire hanging fitting, the variable cross section of the thickness wrapping layer is transited through a buffer slope, and the thickness wrapping layer is sleeved with a wire hanging fitting. According to the utility model, the assembly pipe of the fixing fitting is chamfered at the outlet of the side of the composite core rod, the maximum stress borne by the composite core rod is reduced, the reliability of the composite core rod is improved, and the service life of the composite core rod is prolonged. The composite core rod is covered with the thickness wrapping layer, the variable cross section of the thickness wrapping layer is transited through the buffering slope, the maximum stress borne by the composite core rod is reduced, and meanwhile the possibility that the core rod breaks is further reduced due to the fact that the sectional area of the core rod is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of insulating crossarms, in particular to a composite insulating crossarm with an anti-bending structure. Background Art

[0002] Composite insulating crossarms are composed of end fittings, composite core rods and silicone rubber sheds. The main material of the composite core rod is fiber reinforced polymer, and the common polymer matrix is epoxy resin, etc. It has the characteristics of high strength, light weight, good electrical properties and strong environmental adaptability. With the continuous improvement of the performance of resin and fiber materials in my country and the continuous improvement of manufacturing technology, composite insulating crossarms are gradually replacing traditional steel insulating crossarms and becoming an important part of transmission lines. In actual grid operation, composite crossarms are horizontally fixed to the tower body or tower top of the transmission tower. Insulators or other metal components are usually installed on it to support or hang lightning conductors and wires.

[0003] In actual grid operation, existing composite crossarms are mainly fixed to transmission towers by installing fixing hardware. This fixing method causes local stress concentration in the core rod and weak compressive protection capability. Especially in strong winds, the core rod vibrates more severely and is prone to local fracture, causing the conductor to slip, seriously threatening the normal operation of the power grid system. At the same time, in the production process of composite crossarms, under the condition of extreme bending load, the embedding of the core rod and the crimping process of the hardware often cause external force damage to the composite core rod, causing the composite core rod to fail to exert its ultimate material strength and be destroyed. Utility Model Content

[0004] The utility model provides a composite insulating cross-arm with an anti-bending structure, which can effectively solve the problem in the above-mentioned background technology that the existing composite cross-arm is mainly fixed to the transmission tower by installing fixing hardware during actual grid operation. This fixing method causes local stress concentration in the core rod and weak compressive protection capability. Especially in a strong wind environment, the core rod vibrates more aggravatedly and is prone to local fracture, causing the conductor to slip, seriously threatening the normal operation of the power grid system. At the same time, in the production link of the composite cross-arm, under the condition of extreme bending load, the embedding of the core rod and the crimping process of the hardware often cause external force damage to the composite core rod, resulting in the composite core rod failing to exert the ultimate material strength and being destroyed.

[0005] To achieve the above objectives, the present invention provides the following technical solutions: a composite insulating crossarm with an anti-bending structure, comprising a composite core rod, one end of the outer side of the composite core rod being wrapped with a thick layer, a fixing hardware being sleeved on the outer side of the thick layer, and one end of the composite core rod being sleeved with a wire hanging hardware, and the cross-section of the thick layer being transitioned by a buffer slope;

[0006] The outer side of the composite core rod is wrapped with a silicone rubber shed between the fixing hardware and the hanging hardware.

[0007] According to the above technical solution, the wire hanging fitting is fixed to the outside of the composite core rod by crimping.

[0008] According to the above technical solution, the thickness of the thick layer is 2 mm, and the material of the thick layer is basalt fiber reinforced epoxy resin-based composite material.

[0009] According to the above technical solution, the manufacturing process of the thick wrapping layer is: pre-impregnated basalt fiber and epoxy resin, the width of the pre-impregnated tape is 10 mm, and the winding angle is 45° during winding.

[0010] According to the above technical solution, the radius of the buffer slope is 2 mm, the angle between the buffer slope and the thick layer is 75°, the buffer slope is a transition structure at the variable cross-section, and the buffer slope should be tangent to the composite core rod.

[0011] According to the above technical solution, one end of the fixing hardware is located outside the buffer slope and is chamfered, and the chamfer radius is 2 mm.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. The assembly tube of the fixing hardware is chamfered at the outlet of the composite mandrel side to reduce the maximum stress on the composite mandrel.

[0014] 2. The composite core rod is covered with a thick layer, and the cross-section of the thick layer is transitioned through a buffer slope, which reduces the maximum stress on the composite core rod. At the same time, due to the increase in the cross-sectional area of the core rod, the possibility of the core rod breaking is further reduced.

[0015] 3. The utility model has a simple structure and reasonable layout, which reduces the maximum stress on the composite core rod and has high strength and life, which is conducive to the further use of composite insulating cross arms in power grid systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention.

[0017] In the attached figure:

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0019] Figure 2 This is a structural diagram of the composite core rod of the utility model;

[0020] Figure 3 This is a schematic structural diagram of the thick layer of the utility model;

[0021] Figure 4It is a structural diagram of the fixing hardware of the utility model;

[0022] Figure 5 This is a structural diagram of the utility model wire hanging hardware;

[0023] Numbers in the figure: 1. Composite core rod; 2. Wrapping layer; 3. Fixing hardware; 4. Hanging hardware; 5. Buffer slope; 6. Chamfer; 7. Silicone rubber umbrella skirt. DETAILED DESCRIPTION

[0024] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0025] Example: Figure 1-5 As shown, the utility model provides a technical solution for a composite insulating cross-arm with an anti-bending structure, comprising a composite core rod 1, one end of the outer side of the composite core rod 1 is wrapped with a thick layer 2, a fixing hardware 3 is sleeved on the outer side of the thick layer 2, one end of the composite core rod 1 is sleeved with a hanging hardware 4, and the cross-section of the thick layer 2 is transitioned by a buffer slope 5;

[0026] The outer side of the composite core rod 1 is wrapped with a silicone rubber shed 7 between the fixing hardware 3 and the hanging hardware 4. The silicone rubber shed 7 is wrapped around the outer surface of the composite core rod 1 through a silicone rubber injection process. The main function of the silicone rubber shed 7 is to improve the external insulation performance and prevent equipment flashover. The silicone rubber shed 7 is made of high-temperature vulcanized silicone rubber insulation material, which has hydrophobicity and good insulation properties, and can enhance the equipment's performance against ice flashover, snow flashover, rain flashover, etc.

[0027] The wire hanging fitting 4 is fixed to the outside of the composite core rod 1 by crimping, and the cable is hung in the groove on the top of the wire hanging fitting 4 to support the cable;

[0028] The thickness of the thick layer 2 is 2 mm. The material of the thick layer 2 is a basalt fiber reinforced epoxy resin-based composite material. The manufacturing process of the thick layer 2 is as follows: the prepreg tape is pre-impregnated with basalt fiber and epoxy resin. The prepreg tape is 10 mm wide. At the same time, during the winding process, the winding angle is 45°, the radius of the buffer slope 5 is 2 mm, and the angle between the buffer slope 5 and the thick layer 2 is 75°. The thick layer 2 reduces the maximum stress on the composite core rod 1. At the same time, due to the increase in the cross-sectional area of the composite core rod 1, the possibility of fracture of the composite core rod 1 is further reduced.

[0029] The buffer slope 5 is a transition structure at the variable cross-section. The buffer slope 5 should be tangent to the composite core rod 1. One end of the fixing hardware 3 is located outside the buffer slope 5 and is chamfered 6. The radius of the chamfer 6 is 2 mm, which reduces the maximum stress on the composite core rod 1.

[0030] The working principle and usage process of the utility model are as follows: the silicone rubber shed 7 is wrapped on the outer surface of the composite core rod 1 through the silicone rubber injection process, the prepreg tape is wrapped around one end of the outer side of the composite core rod 1 to form a thick layer 2, after the thick layer 2 is wrapped, the fixing hardware 3 is sleeved on the outside of the thick layer 2, the fixing hardware 3 is connected and fixed to the composite core rod 1, after the fixing hardware 3 is assembled, the hanging hardware 4 is fixed to the other end of the outer side of the composite core rod 1 by crimping, and the assembly of the insulating cross arm is completed;

[0031] When installing the insulating cross arm, the fixing hardware 3 can be fixed in the installation position using an expansion screw or a fixing hoop, which is easy to install. When in use, the cable is hung in the groove on the top of the hanging hardware 4, and then the cable is fixed. When the insulating cross arm is subjected to external force, the thick layer 2 reduces the maximum stress on the composite core rod 1. At the same time, due to the increase in the cross-sectional area of the composite core rod 1, the possibility of the composite core rod 1 breaking is reduced, and the port of the assembly tube of the fixing hardware 3 is chamfered 6, which further reduces the maximum stress on the composite core rod 1. The insulating cross arm has a simple structure and a reasonable layout, reduces the maximum stress on the composite core rod 1, has high strength and life, and is conducive to the further use of the composite insulating cross arm in the power grid system.

[0032] The main function of the silicone rubber shed 7 is to improve the external insulation performance and prevent equipment flashover. The silicone rubber shed 7 is made of high-temperature vulcanized silicone rubber insulation material, which is hydrophobic and has good insulation performance. In substation equipment, the silicone rubber shed 7 is used to prevent flashover. By increasing the shed diameter to strengthen insulation, it prevents rain, ice and snow from eroding the equipment, thereby improving the stability and safety of the equipment.

[0033] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A composite insulating cross-arm with an anti-bending structure, comprising a composite core rod (1), characterized in that: One end of the outer side of the composite core rod (1) is wrapped with a thick layer (2), and the thickness of the thick layer (2) is 2 mm; The outer side of the thick layer (2) is sleeved with a fixing hardware (3), one end of the composite core rod (1) is sleeved with a wire hanging hardware (4), and the cross-section of the thick layer (2) is transitioned through a buffer slope (5); The outer side of the composite core rod (1) is located between the fixing hardware (3) and the hanging hardware (4) and is wrapped with a silicone rubber umbrella skirt (7).

2. The composite insulating cross-arm with an anti-bending structure according to claim 1, characterized in that: The wire hanging fitting (4) is fixed to the outside of the composite core rod (1) by crimping.

3. The composite insulating cross-arm with an anti-bending structure according to claim 1, characterized in that: The material of the thick layer (2) is a basalt fiber reinforced epoxy resin-based composite material.

4. The composite insulating cross-arm with an anti-bending structure according to claim 3, characterized in that: The manufacturing process of the thick layer (2) is as follows: pre-impregnated basalt fiber and epoxy resin are pre-impregnated, the width of the pre-impregnated tape is 10 mm, and when winding, the winding angle is 45°.

5. The composite insulating cross-arm with an anti-bending structure according to claim 1, characterized in that: The radius of the buffer slope (5) is 2 mm, the angle between the buffer slope (5) and the thick layer (2) is 75 degrees, the buffer slope (5) is a transition structure at the variable cross-section, and the buffer slope (5) should be tangent to the composite core rod (1).

6. The composite insulating cross-arm with an anti-bending structure according to claim 1, characterized in that: One end of the fixing hardware (3) is located outside the buffer slope (5) and is chamfered (6), and the radius of the chamfer (6) is 2 mm.

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