Composite cross arm and power transmission pole

Abstract

Disclosed in the present application is a composite cross arm, comprising: two first cross arms, wherein first intermediate portions of the first cross arms are respectively fixed to two sides of a pole body, and the lengthwise directions of the first cross arms are located in the same horizontal plane and are parallel to each other; two first connection assemblies, wherein corresponding ends of the two first cross arms are connected together by means of the first connection assemblies, and two ends of each first connection assembly are respectively configured to be connected to two first wire clips; a second connection assembly, wherein corresponding second intermediate portions of the two first cross arms are connected together by means of the second connection assembly, which is configured to be connected to a second wire clip, and the second wire clip is located below the first cross arm; and two tension members, wherein one end of each tension member is connected to the first intermediate portion of each of the two first cross arms, the other end of each tension member is configured to be connected to the first wire clip, and the lengthwise direction of each tension member and the lengthwise direction of each first cross arm are located in the same horizontal plane and are perpendicular to each other. The composite cross arm in the present application uses a fully insulated horizontal structure, and a jumper is hung and fixed below the cross arm, such that accidents such as tripping caused by bird electrocutions can be prevented, and thus the safety level is higher, and the operation and maintenance costs are lower. Further disclosed in the present application is a power transmission pole.

Description

A composite crossarm and transmission pole Technical Field

[0001] This application relates to the field of overhead transmission line technology, and in particular to a composite crossarm and transmission pole. Background Technology

[0002] A crossarm is a component installed on a pole in an overhead power line, its main function being to support the conductors. Traditional transmission poles use iron crossarms, with insulators installed on the crossarms to connect the conductors. When bare conductors are used, birds taking off or landing on the transmission pole may simultaneously come into contact with any two conductors or any conductor and the iron crossarm, forming a energized circuit and causing electric shock. This directly affects the normal operation of power infrastructure, leading to accidents such as power outages, and also causes bird deaths, reducing biodiversity. Furthermore, tension iron crossarms typically use a raised middle section for the middle phase jumper to ensure insulation distance between the middle phase jumper and other energized structures. However, this often uses a free jumper form, which can experience severe wind deflection under significant wind loads, making it difficult to guarantee sufficient insulation distance and increasing the risk of bird strikes and power accidents.

[0003] Currently, the common practice is to install insulating sleeves around the bare conductors near utility poles to protect birds from electric shocks. However, this method of protection is expensive, has poor long-term effectiveness, requires regular replacement and maintenance, and has high operating and maintenance costs. Summary of the Invention

[0004] To address the shortcomings of existing technologies, one of the objectives of this application is to provide a composite crossarm that employs a fully insulated horizontal structure and, by installing a fixed middle-phase jumper below the crossarm, can effectively prevent accidents such as tripping caused by electric shocks from birds, resulting in higher safety and lower maintenance costs.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: A composite crossarm includes: two first crossarms, the first middle parts of the two first crossarms being fixed to both sides of the pole respectively, the length directions of the two first crossarms being in the same horizontal plane and parallel to each other; two first connecting assemblies, the corresponding ends of the two first crossarms being connected together through the first connecting assemblies, the two ends of the first connecting assemblies being used to connect two first clamps respectively; a second connecting assembly, the corresponding second middle parts of the two first crossarms being connected together through the second connecting assembly, used to connect a second clamp, the second clamp being located below the first crossarm; and two tension members, one end of the two tension members being connected to the first middle parts of the two first crossarms respectively, the other end of the two tension members being used to connect the first clamp, the length direction of the tension members being in the same horizontal plane and perpendicular to each other with the length direction of the first crossarm.

[0006] In one embodiment, the first crossarm includes a core rod, connecting fittings, intermediate fittings, two end fittings, and an insulating layer. The connecting fittings are connected to the first middle part of the core rod and are used to connect the tension member and the pole. The intermediate fittings are connected to the second middle part of the core rod and are used to connect the second connecting assembly. The two end fittings are respectively connected to the two ends of the core rod and are used to connect the first connecting assembly. The insulating layer covers at least a portion of the outer peripheral surface of the core rod.

[0007] In one embodiment, the connecting fitting is a cross-shaped fitting, which includes a first sleeve and a pole connector. The first sleeve is sleeved on the first middle part of the mandrel, and the pole connector is perpendicularly connected to the first sleeve. The pole connector is used to connect the pole.

[0008] In one embodiment, the pole connector includes two first connectors, which are vertically connected to the middle of the first sleeve and located on opposite axial sides of the first sleeve. The first connectors are used to connect the pole.

[0009] In one embodiment, the first connector includes a first plate and two second plates, the first plate and the second plates are perpendicularly connected, and the two second plates extend in the same direction from both ends of the first plate away from the first plate. The ends of the two second plates that are not connected to the first plate are perpendicularly connected to the first sleeve. The second plates are provided with a first connecting hole for connecting the pole.

[0010] In one embodiment, the first sleeve has a tension connection part on the side away from the pole, and the tension connection part has a second connection hole for connecting the tension member.

[0011] In one embodiment, the tension member is a tension composite insulator or a tension fitting.

[0012] In one embodiment, the intermediate fitting includes a second sleeve and a second connector. The second sleeve is fitted onto the second middle part of the mandrel, and the second connector is connected to the bottom side of the second sleeve. The second connector has a third connecting hole for connecting a second connecting assembly.

[0013] In one embodiment, the end fitting includes an end sleeve and a third connector. The end sleeve is fitted onto the end of the mandrel, and the third connector is connected to the top of the end sleeve. The third connector has a fourth connecting hole for connecting the first connecting assembly.

[0014] In one embodiment, the composite crossarm further includes an insulating protective cover for covering the top of the pole and the metal structure in the middle of the composite crossarm.

[0015] In one embodiment, the insulating protective cover includes a first protective cover and a second protective cover. The first protective cover is used to cover the metal structure on the top of the pole and the upper middle part of the composite crossarm, and the second protective cover is used to cover the metal structure on the lower middle part of the composite crossarm. The top of the first protective cover is a pointed structure.

[0016] In one embodiment, the composite crossarm is used to hang conductors and jumpers, with the jumpers extending and hanging below the composite crossarm.

[0017] In one embodiment, the conductor includes a middle phase conductor, which is respectively hung on the first clamps of two tension members on both sides of the pole. The middle phase jumper is led out from one of the first clamps of the tension member and extends from below the composite crossarm to hang on the second clamp, and then extends from below the composite crossarm to hang on the first clamp of the other tension member. The middle phase jumper is electrically connected to the middle phase conductor.

[0018] In one embodiment, the conductor includes a side phase conductor, which is respectively hung on two first clamps connected to both ends of the first connecting assembly on both sides of the pole. The side phase jumper is led out from the first clamp connected to one end of the first connecting assembly and extends from below the composite crossarm to the first clamp connected to the other end of the first connecting assembly, and the side phase jumper is electrically connected to the side phase conductor.

[0019] The second objective of this application is to provide a power transmission pole, including a pole and the aforementioned composite crossarm, wherein the composite crossarm is fixed to the pole.

[0020] The beneficial effects of this application are as follows: Unlike existing technologies, the composite crossarm of this application adopts a fully insulated horizontal structure, and a fixed middle-phase jumper is hung below it through a second connecting component. This avoids the wind deflection risk caused by using a free jumper in the middle of the composite crossarm, ensuring the insulation distance between conductors on the high-voltage end of the transmission pole and between the conductors and the top of the pole on the low-voltage end. This prevents birds from forming a live circuit regardless of their position on the transmission pole when taking off, standing, or landing, effectively preventing accidents such as tripping caused by bird strikes. It offers higher safety, lower maintenance costs, and effectively reduces the probability of birds being electrocuted on the transmission pole, thus protecting biodiversity. Furthermore, the composite crossarm adopts an assembled structure of double horizontal crossarms. By selecting different specifications of the first and second connecting components, the composite crossarm can be adapted to more pole sizes, making installation more flexible and versatile.

[0021] Meanwhile, the composite crossarm of this application covers the metal structure at the top of the pole and in the middle of the composite crossarm with an insulating protective cover, which can enhance the insulation effect at the top of the pole and further reduce the probability of birds being electrocuted.

[0022] Furthermore, compared to traditional iron crossarms, the first connecting component of the composite crossarm used in this application is directly connected to the phase conductor, which eliminates the need for insulator structures at both ends, making the crossarm structure simpler, easier to install, less prone to corrosion, and with a longer service life. Attached Figure Description

[0023] Figure 1 is a structural schematic diagram of a power transmission pole 1000 according to an embodiment of this application;

[0024] Figure 2 is a structural schematic diagram of the first crossbeam 100 according to an embodiment of this application;

[0025] Figure 3 is a structural schematic diagram of the connecting fitting 120 according to an embodiment of this application;

[0026] Figure 4 is a partial structural schematic diagram of the first crossarm 100 according to an embodiment of this application;

[0027] Figure 5 is a structural schematic diagram of the end fitting 140 according to an embodiment of this application;

[0028] Figure 6 is a partial structural schematic diagram of a power transmission pole 1000 according to another embodiment of this application. Detailed Implementation

[0029] As requested, specific embodiments of this application are disclosed herein. However, it should be understood that the embodiments disclosed herein are merely typical examples of this application and may be embodied in various forms. Therefore, the specific details disclosed herein are not intended to be limiting, but merely to serve as the basis for the claims and as a representative basis for teaching those skilled in the art to apply this application differently in practice in any appropriate manner, including employing the various features disclosed herein in combination with features that may not be explicitly disclosed herein.

[0030] The term "connection" as used in this application, unless otherwise explicitly specified or limited, should be interpreted broadly, encompassing both direct connection and connection via an intermediate medium. In the description of this application, it should be understood that the orientation or positional relationship indicated by terms such as "upper," "lower," "end," and "one end" is based on the orientation or positional relationship shown in the accompanying drawings and is used solely for the convenience of describing this application and for simplification, rather than indicating or implying that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0031] As shown in Figure 1, this application provides a transmission pole 1000, which is a tension pole. The tension pole includes a composite crossarm 10 and a pole 20, with the composite crossarm 10 fixed to the pole 20. In power systems, a tension pole refers to a tower used to segment lines to control the range of pole collapse and line breakage. Tension poles are used to hang conductors by setting tension components and tension clamps on the crossarm.

[0032] The composite crossarm 10 includes two first crossarms 100, two first connecting assemblies 200, a second connecting assembly 300, and two tension members 400. The first middle parts of the two first crossarms 100 are respectively fixed on both sides of the pole 20. The length directions of the two first crossarms 100 are located in the same horizontal plane and are parallel to each other. The corresponding ends of the two first crossarms 100 are connected together by the first connecting assembly 200. The two ends of the first connecting assembly 200 are respectively used to connect two first clamps 11 to hang the side phase conductor and the side phase jumper. The second middle parts of the two first crossarms 100 are connected together by the second connecting assembly 300 for connecting the second clamp 12 to hang the middle phase jumper. The second clamp 12 is located below the first crossarm 100. One end of the two tension members 400 is connected to the first middle parts of the two first crossarms 100 respectively, and the other end of the two tension members 400 is used to connect the first clamp 11 to hang the middle phase conductor and the middle phase jumper. The length direction of the tension member 400 is on the same horizontal plane as the length direction of the first crossarm 100 and is perpendicular to each other.

[0033] The transmission pole 1000 of this application uses a composite crossarm 10 to hang the conductors. The composite crossarm 10 adopts a fully insulated horizontal structure, and a fixed middle-phase jumper is hung below it through the second connecting component 300. This avoids the wind deflection risk caused by the free jumper in the middle of the composite crossarm 10, and ensures the insulation distance between the conductors on the high-voltage end of the transmission pole 1000 and between the conductors and the top of the pole 20 on the low-voltage end. This ensures that no matter where birds take off, stand, or land on the transmission pole 1000, they will not form a live circuit, effectively preventing accidents such as tripping caused by electric shock birds. It is safer, has lower maintenance costs, and can also effectively reduce the probability of birds being electrocuted and dying on the transmission pole 1000, thus protecting biodiversity. In traditional solutions, tension poles hang conductors by setting suspension insulators on iron crossarms. In this application, the first connecting component 200 of the composite crossarm 10 is used to directly hang the side-phase conductors, which eliminates the insulator structure at both ends, making the crossarm structure simpler, easier to install, less prone to corrosion, and with a longer service life.

[0034] It should be noted that the first middle part and the second middle part mentioned in this application refer to the part between the two ends, not strictly the center part. Specifically, the second middle part of the first crossarm 100 is located between the first middle part of the first crossarm 100 and its end.

[0035] As shown in Figure 2, the first crossarm 100 includes a core rod 110 (marked in the figure for illustrative purposes only), connecting fittings 120, intermediate fittings 130, two end fittings 140, and an insulating layer 150. The connecting fittings 120 are connected to the first middle part of the core rod 110 and are used to connect the tension member 400 and the pole 20. The intermediate fittings 130 are connected to the second middle part of the core rod 110 and are used to connect the second connecting assembly 300. The two end fittings 140 are respectively connected to the two ends of the core rod 110 and are used to connect the first connecting assembly 200. The insulating layer 150 covers at least a portion of the outer peripheral surface of the core rod 110.

[0036] The mandrel 110 is made of composite materials, such as glass fiber or aramid fiber impregnated with epoxy resin and then pultruded. Compared with the metal materials of traditional crossarms, composite materials are more corrosion resistant, lower in cost, and can achieve a significant weight reduction, making the installation of the first crossarm 100 more convenient.

[0037] As shown in Figure 3, the connecting hardware 120 is a cross-shaped hardware. The connecting hardware 120 includes a first sleeve 121 and a pole connector 122. The first sleeve 121 is sleeved on the first middle part of the core rod 110. That is, the first sleeve 121 is a hollow tube structure, which is sleeved on the outer periphery of the first middle part of the core rod 110, and the first sleeve 121 is fixed on the core rod 110 by a crimping process. The pole connector 122 is perpendicularly connected to the first sleeve 121 and is used to fix the first crossarm 100 on the pole 20.

[0038] The pole connector 122 includes two first connectors 123, which are vertically connected to the middle of the first sleeve 121 and located on both axial sides of the first sleeve 121 respectively. The first connectors 123 are used to connect the pole 20.

[0039] The first connector 123 includes a first plate 1231 and two second plates 1232. The first plate 1231 and the second plate 1232 are perpendicularly connected, and the two second plates 1232 extend in the same direction from both ends of the first plate 1231 away from the first plate 1231. The ends of the two second plates 1232 that are not connected to the first plate 1231 are perpendicularly connected to the first sleeve 121. Both second plates 1232 are provided with first connecting holes 12321 for connecting the pole 20. The two first connecting holes 12321 are coaxially arranged and their through direction is perpendicular to the plate surface of the second plates 1232. The pole 20 is provided with first mounting holes (not shown) that correspond to the first connecting holes 12321. By inserting bolts, screws, or other fasteners through the corresponding first connecting holes 12321 and first mounting holes, the connecting hardware 120 can be matched and connected to the pole 20. That is, there is no need to drill holes in the first sleeve 121 and the core rod 110 for connection, avoiding the impact of drilling on the mechanical properties of the core rod 110, and thus avoiding potential electrical safety hazards. In addition, the first connecting member 123 is designed with a hollow structure, which can reduce the weight of the connecting hardware 120 while ensuring connection strength, thereby reducing costs.

[0040] The first sleeve 121 has a tension connecting part 124 on the side away from the pole 20. The tension connecting part 124 has a second connecting hole 1241 for connecting the tension member 400. The tension connecting part 124 can be set in the middle of the first sleeve 121, so that the tension member 400 is subjected to more even stress after installation.

[0041] The tension connector 124 is an L-shaped plate, including a third plate 1242 and a fourth plate 1243 connected vertically. The third plate 1242 is vertically attached to the side of the first sleeve 121 away from the pole 20. The fourth plate 1243 is horizontally positioned and extends away from the first sleeve 121. One end of the fourth plate 1243 connected to the third plate 1242 is also connected to the first sleeve 121. The fourth plate 1243 has a second connecting hole 1241, the through direction of which is perpendicular to the surface direction of the fourth plate 1243. This hole is used to connect the tension member 400 via a hanging ring or other connecting component. The third plate 1242 strengthens the connection between the fourth plate 1243 and the first sleeve 121, thus making the installation of the tension member 400 more stable. Furthermore, the thickness of the fourth plate 1243 in the vertical direction is less than the height of the first sleeve 121 in the vertical direction, which can reduce the weight of the connecting hardware 120 while ensuring the connection strength of the tension member 400, thereby reducing costs.

[0042] As shown in Figure 4, the intermediate fitting 130 includes a second sleeve 131 and a second connector 132. The second sleeve 131 is fitted onto the second middle part of the mandrel 110, and the second connector 132 is connected to the bottom side of the second sleeve 131. The second connector 132 is provided with a third connecting hole 1321 for connecting the second connecting assembly 300 with fasteners such as bolts and screws. This eliminates the need to drill holes in the second sleeve 131 and the mandrel 110 for connection, avoiding the impact of drilling on the mechanical properties of the mandrel 110 and thus avoiding potential electrical safety hazards.

[0043] The second connector 132 includes two fifth plates 1322. The fifth plates 1322 are connected to the bottom side of the second sleeve 131 and extend horizontally away from the second sleeve 131. The two fifth plates 1322 are symmetrically arranged along the axis of the second sleeve 131, meaning they are positioned opposite each other in the horizontal plane containing the bottom surface of the second sleeve 131. Each fifth plate 1322 has a third connecting hole 1321, the through direction of which is perpendicular to the surface direction of the fifth plate 1322. Furthermore, the fifth plates 1322 are located in the middle of the second sleeve 131, resulting in more even stress distribution after the second connecting assembly 300 is installed. The thickness of the fifth plates 1322 in the vertical direction is less than the height of the second sleeve 131 in the vertical direction, which reduces the weight of the intermediate fitting 130 while ensuring the connection strength of the second connecting assembly 300, thus lowering costs. The structure of the second sleeve 131 and its connection with the mandrel 110 are similar to those of the first sleeve 121.

[0044] As shown in Figure 5, the end fitting 140 includes an end sleeve 141 and a third connector 142. The end sleeve 141 is fitted onto the end of the mandrel 110, and the third connector 142 is connected to the top of the end sleeve 141. The third connector 142 is provided with a fourth connection hole 1421 for connecting the first connecting assembly 200 with fasteners such as bolts and screws. This eliminates the need to drill holes in the end sleeve 141 and the mandrel 110 for connection, avoiding the impact of drilling on the mechanical properties of the mandrel 110 and thus avoiding potential electrical safety hazards.

[0045] The end sleeve 141 is a hollow tube structure with one end closed. Its open end is sleeved on the outer periphery of the end of the mandrel 110, and the end sleeve 141 is fixed to the end of the mandrel 110 by a pressing process.

[0046] The third connector 142 includes two sixth plates 1422. The sixth plates 1422 are connected to the top side of the end sleeve 141 and extend horizontally away from the end sleeve 141. The two sixth plates 1422 are symmetrically arranged along the axis of the end sleeve 141, meaning they are positioned opposite to each other in the horizontal plane containing the top surface of the end sleeve 141. Each sixth plate 1422 has a fourth connecting hole 1421, the through direction of which is perpendicular to the surface direction of the sixth plate 1422. Furthermore, the third connector 142 is located on the top side of the end of the end sleeve 141 that is not connected to the mandrel 110, thus reserving a pressing position between the end sleeve 141 and the mandrel 110 to ensure the connection strength between the end fitting 140 and the mandrel 110. The thickness of the sixth plate 1422 in the vertical direction is less than the height of the end sleeve 141 in the vertical direction. This can reduce the weight of the end fitting 140 and lower the cost while ensuring the connection strength of the first connecting assembly 200.

[0047] The insulation layer 150 includes a sheath. The insulation layer 150 is located on the outer periphery of the core rod 110, excluding the connecting hardware 120, intermediate hardware 130, and end hardware 140. The insulation layer 150 is sealed to the connecting hardware 120, the intermediate hardware 130, and the end hardware 140, effectively preventing external moisture from intruding and damaging the core rod 110, thus avoiding affecting the service life of the first crossarm 100. Furthermore, the insulation layer 150 also includes skirts spaced on the sheath, which increases the creepage distance on the outer surface of the first crossarm 100. In addition, the skirts prevent birds from nesting, improving the overall electrical safety of the first crossarm 100.

[0048] In one embodiment, the insulating layer 150 is high-temperature vulcanized silicone rubber. The silicone rubber material is encapsulated around the mandrel 110 using a vacuum injection molding process to form a high-temperature vulcanized silicone rubber insulating layer. High-temperature vulcanized silicone rubber has good aging resistance and hydrophobic migration properties, which can reduce the probability of flashover and rain flashover, and improve the electrical safety of the first crossarm 100. In other embodiments, the insulating layer can also be formed by molding or pre-molded and then fitted onto the outer periphery of the mandrel; no specific limitations are imposed here.

[0049] The cross-sectional shapes and dimensions of the first sleeve 121, the second sleeve 131, and the end sleeve 141 all match the cross-sectional shape of the mandrel 110. In one embodiment, the mandrel 110 has a square cross-sectional shape, and each sleeve is a square tube, so as to fix each sleeve to the mandrel 110 and increase the contact area between each sleeve and the mandrel 110, ensuring the connection strength between the connecting hardware 120, the intermediate hardware 130, the end hardware 140, and the mandrel 110. In other embodiments, the cross-sectional shape of the mandrel can also be circular, T-shaped, or I-shaped, and each sleeve can also be a circular tube, a T-shaped tube, or an I-shaped tube, as long as it matches the cross-sectional shape of the mandrel, no specific limitation is made here.

[0050] In one embodiment, the connecting fitting 120, intermediate fitting 130, and end fitting 140 can be made of metal (e.g., iron, steel, aluminum, etc.), which is readily available and inexpensive. Furthermore, the connecting fitting 120, intermediate fitting 130, and end fitting 140 are all individually molded fitting components connected together by welding, resulting in reliable connections and simple manufacturing. In other embodiments, each fitting can also be integrally molded by casting or other methods, as long as the connection strength between the components can be guaranteed; no specific limitations are imposed here.

[0051] Referring to Figures 1 and 5, the top sides of the end fittings 140 corresponding to the two first crossarms 100 are connected together by a first connecting assembly 200 for connecting the first wire clamps 11. The first connecting assembly 200 is an angle steel piece with an L-shaped cross-section. The first connecting assembly 200 is provided with two sets of second mounting holes (not shown in the figure) spaced apart. Each set includes two second mounting holes, which are corresponding to the two fourth connecting holes 1421 on the end fittings 140, so as to connect the end fittings 140 corresponding to the two first crossarms 100 together through the first connecting assembly 200. A third mounting hole (not shown in the figure) is also provided at each end of the first connecting assembly 200 for connecting the first wire clamps 11 by means of a U-shaped hanging ring, etc. That is, the two first wire clamps 11 are respectively connected to the two ends of the first connecting assembly 200. During installation, the two first crossarms 100 are placed horizontally with their ends corresponding to each other. The first connecting assembly 200 is placed above the end fittings 140 at the corresponding ends of the two first crossarms 100, so that the two sets of second mounting holes on the first connecting assembly 200 are aligned with the fourth connecting holes 1421 on the two end fittings 140. The two first crossarms 100 are then connected by inserting and tightening mating bolts, nuts, and other fasteners into the corresponding second mounting holes and fourth connecting holes 1421. The corresponding end fittings 140 are connected to the same first connecting assembly 200, so that the corresponding ends of the two first crossarms 100 are connected together. Then, the two U-shaped hanging rings are respectively connected to the two third mounting holes, and the two first wire clamps 11 are respectively connected to the two U-shaped hanging rings, thus completing the assembly of the corresponding ends of the two first crossarms 100. Finally, the corresponding other ends of the two first crossarms 100 are also connected together in the same way. The fastening of the U-shaped hanging rings and the first wire clamps 11 can be achieved by bolts, nuts and other fasteners.

[0052] Referring to Figures 1 and 4, the bottom sides of the intermediate fittings 130 corresponding to the two first crossarms 100 are connected together by the second connecting assembly 300, which is used to connect the second wire clamp 12 to fix and hang the middle phase jumper. The second connecting assembly 300 is an angle steel piece with an L-shaped cross-section. The second connecting assembly 300 has two sets of fourth mounting holes (not shown in the figure) spaced apart. Each set includes two fourth mounting holes, which are corresponding to the two third connecting holes 1321 on the intermediate fitting 120, so that the intermediate fittings 130 corresponding to the two first crossarms 100 are connected together by the second connecting assembly 300. A fifth mounting hole (not shown in the figure) is provided in the middle of the second connecting assembly 300, which is used to connect the second wire clamp 12 by a U-shaped hanging ring, etc., that is, the second wire clamp 12 is connected to the bottom side of the middle part of the second connecting assembly 300. The specific installation process is similar to that of the first connecting assembly 200, and will not be described again.

[0053] The composite crossarm 10 fixes the first crossarm 100 to the pole 20 through the connecting hardware 120, and connects the two first crossarms 100 together through the first connecting component 200 and the second connecting component 300 to hang the conductor. That is, the composite crossarm 10 adopts the assembly structure of double horizontal crossarms. By selecting different specifications of the first connecting component 200 and the second connecting component 300, the composite crossarm 10 can be used for more specifications of poles 20, making the installation more flexible and more versatile.

[0054] Referring to Figures 1 and 3, one end of each of the two tension members 400 is connected to two connecting fittings 120 via ball-head plates or U-shaped rings, and the other end of each tension member 400 is connected to a first clamp 11 via a ball-and-socket plate. During installation, first connect the two ball-head plates or U-shaped rings to the second connecting holes 1241 of the two tension connecting parts 124, then connect one end of each tension member 400 to the two ball-head plates or U-shaped rings, then connect the two ball-and-socket plates to the other end of each tension member 400, and finally connect the two first clamps 11 to the two ball-and-socket plates. All the above components can be connected and secured using bolts, nuts, or other fasteners.

[0055] In one embodiment, the tension member 400 can be a tension composite insulator as in the prior art. The ball head hanger, U-shaped hanging ring, and ball socket hanger are connectors in the prior art that match the fittings at both ends of the tension composite insulator. For example, when the fitting at one end of the tension composite insulator is a ball socket fitting, a ball head hanger is selected for connection; when the fitting at one end of the tension composite insulator is a Y-shaped fitting, a U-shaped hanging ring is selected for connection. The first clamp 11 can be a tension clamp in the prior art, and the second clamp 12 can be a suspension clamp in the prior art. In other embodiments, the tension member can also be a tension fitting in the prior art, etc. The corresponding connectors can be replaced according to the installation requirements, and the first and second clamps can also adopt other clamp structures, as long as the corresponding wire hanging function can be achieved. No specific restrictions are made here.

[0056] When installing the composite crossarm 10, firstly, select the appropriate specifications for the first connecting component 200 and the second connecting component 300 according to the size of the pole 20. Then, connect the end fittings 140 of the two first crossarms 100 together through the first connecting component 200, and install the first clamps 11 at both ends of the first connecting component 200. Next, connect the intermediate fittings 130 of the two first crossarms 100 together through the second connecting component 300, and install the second clamp 12 at the lower middle part of the second connecting component 300. Then, connect one end of the two tension members 400 to the connecting fittings 120 of the two first crossarms 100 respectively, and install the first clamps 11 at the other end of the two tension members 400 respectively. Finally, put the preliminarily assembled two first crossarms 100 on the appropriate position at the top of the pole 20, and fix the two first crossarms 100 to both sides of the pole 20 through the two connecting fittings 120 respectively. The composite crossarm 10 can then be installed and fixed on the pole 20. The whole installation process is simple and convenient.

[0057] When a single-circuit three-phase conductor is hung on the composite crossarm 10, the three-phase conductor includes two side-phase conductors, one middle-phase conductor, and jumpers corresponding to each of the three phase conductors. The two side-phase conductors are respectively hung at both ends of the composite crossarm 10, and the middle-phase conductor is hung on the tension member 400 in the middle of the composite crossarm 10. The jumpers extend and are hung below the composite crossarm 10. The hanging structure of the side-phase conductor is specifically described using one phase as an example. Along the conductor extension direction, the side-phase conductor is respectively hung on two first clamps 11 connected to both ends of the first connecting assembly 200 on both sides of the pole 20. The side-phase jumper is led out from the first clamp 11 connected to one end of the first connecting assembly 200 and extends from below the composite crossarm 10 to the first clamp 11 connected to the other end of the first connecting assembly 200. The side-phase jumper is electrically connected to the side-phase conductors on both sides of the first connecting assembly 200. The middle phase conductor is hung on the first clamp 11 connected to the ends of the two tension members 400 on both sides of the pole 20. The middle phase jumper is led out from the first clamp 11 connected to one of the tension members 400 and extends from below the composite crossarm 10 to the second clamp 12 in the middle of the second connecting assembly 300. Then it extends from below the composite crossarm 10 to the first clamp 11 connected to the other tension member 400. The middle phase jumper is electrically connected to the middle phase conductors on both sides of the pole 20.

[0058] In one embodiment, a middle phase jumper point may be provided on the composite crossarm 10, that is, an intermediate fitting 130 may be provided on the first crossarm 100, and the bottom sides of the intermediate fittings 130 of the two first crossarms 100 are connected together by the second connecting component 300.

[0059] In another embodiment, as shown in Figure 1, two middle-phase jumper points can be provided on the composite crossarm 10. That is, two intermediate fittings 130 can be provided on the first crossarm 100. The two intermediate fittings 130 are located on both sides of the connecting fitting 120, and the bottom sides of the corresponding intermediate fittings 130 of the two first crossarms 100 can be connected together through the second connecting component 300. When hanging the line, one of the middle-phase jumper points can be selected for fixing the jumper according to the hanging requirements of the transmission pole 1000, making the hanging more flexible and the application scenarios wider.

[0060] Furthermore, the first crossarm 10 can be configured as a symmetrical structure, that is, the connecting hardware 120 is located at the midpoint of the first crossarm 100, and the two intermediate hardware 130 are located at the quarter points or quintile points of the first crossarm 100, so that the composite crossarm 10 is subjected to more uniform force and the structure is more stable after installation.

[0061] The overall length of the composite crossarm 10, the length of the first crossarm 100, and the specifications of the first clamp 11 and the second clamp 12 can all be adjusted according to requirements. The installation sequence of the composite crossarm 10 can also be adjusted according to requirements. For example, the two first crossarms 100 can be fixed on the pole 20 first, then the tension member 400 can be installed, and then the two first crossarms 100 can be connected through the first connecting component 200 and the second connecting component 300. No specific restrictions are made here.

[0062] Furthermore, as shown in Figure 6, the composite crossarm 10 also includes an insulating protective cover 500. The insulating protective cover 500 includes a first protective cover 510 and a second protective cover 520. The first protective cover 510 is used to cover the top of the pole 20 and the metal structure on the upper side of the middle part of the composite crossarm 10. The second protective cover 520 is used to cover the metal structure on the lower side of the middle part of the composite crossarm 10. The first protective cover 510 and the second protective cover 520 work together to cover the top of the pole 20 and the metal structure in the middle part of the composite crossarm 10, so as to enhance the insulation effect of the top of the pole 20, further prevent birds from forming an electrical circuit when taking off, standing or landing on the top of the pole 20 and electrocuting the birds, thereby reducing the probability of birds being electrocuted and protecting biodiversity.

[0063] The main structure of the insulating protective cover 500 is a cuboid structure with an open bottom, which facilitates the installation of the insulating protective cover 500; and the insulating protective cover 500 is provided with several cavities for inserting part of the composite crossarm 10 or fasteners such as bolts and nuts.

[0064] The main structure of the first protective cover 510 is a cuboid structure with an open bottom. After the composite crossarm 10 is installed on the pole 20, the height of the cuboid structure in the vertical direction matches the distance between the top of the pole 20 and the bottom side of the first sleeve 121. The width of the cuboid structure in the direction of the conductor extension matches the distance between the two opposite sides of the first sleeves 121. The length of the cuboid structure in the length direction of the first crossarm 100 matches the length of the pole 20 in that direction, so that the first protective cover 510 can cover the top of the pole 20 from top to bottom while saving material costs.

[0065] The first protective cover 510 is provided with several first cavities, four second cavities and two third cavities (not shown in the figure). The several first cavities are set to correspond to the first mounting holes on the pole 20, the four second cavities are set to correspond to the mounting positions of the first crossarm 100, and the two third cavities are set to correspond to the mounting positions of the tension member 400. This ensures the insulation effect while facilitating the installation of fasteners and the composite crossarm 10.

[0066] Furthermore, a third protective cover 530 extends outward from the second cavity of the first protective cover 510. The extension direction of the third protective cover 530 is the same as the length direction of the first crossarm 100, and it is used to cover the metal structure of the connecting hardware 120 protruding from the pole 20 along the length direction of the first crossarm 100. A fourth protective cover 540 extends outward from the third cavity of the first protective cover 510. The extension direction of the fourth protective cover 540 is the same as the length direction of the tension member 400, and it is used to cover the metal connection structure between the tension member 400 and the connecting hardware 120. The main structure of the third protective cover 530 and the fourth protective cover 540 is also a cuboid structure, and the size of the cuboid matches the size of the corresponding metal structure it covers.

[0067] The main structure of the second protective cover 520 is a cuboid structure with openings at both the bottom and top. The length and width of this cuboid structure are the same as those of the main structure of the first protective cover 510. The vertical height of this cuboid matches the distance between the bottom side of the first sleeve 121 and the bottom end of the target covering area on the pole 20. The second protective cover 520 is provided with several fourth cavities, which correspond to the first mounting holes on the pole 20, facilitating the insertion of fasteners while ensuring insulation. The target covering area on the pole 20 can be adjusted according to actual covering requirements, and no specific restrictions are imposed here.

[0068] Furthermore, the second protective cover 520 may include two sub-protective covers 521. The two sub-protective covers 521 are cuboid structures with openings on three sides. The two sub-protective covers 521 can be assembled to form the second protective cover 520, so that the second protective cover 520 can be installed from both sides of the pole 20, making the operation simpler and more convenient.

[0069] Furthermore, the top of the first protective cover 510 is a pointed structure; that is, the main structure of the first protective cover 510, the third protective cover 530, and the fourth protective cover 540 all have pointed structures with their pointed tips facing upwards. Thus, when the first protective cover 510 is installed, the pointed structure can prevent birds from standing or perching on the top of the pole 20 and in the middle of the composite crossarm 10, further reducing the probability of birds being electrocuted and protecting biodiversity. The pointed structure can be conical or pyramidal, with a simple structure and convenient manufacturing.

[0070] Furthermore, the insulating protective cover 500 also includes a fastener protective cover 550, which is used to cover the nuts and other fasteners that need to be installed during the installation of the composite crossarm 10 and the pole 20, thereby further improving the coverage of the top of the pole 20 and the middle metal structure of the composite crossarm 10, and thus further strengthening the insulation effect of the top of the pole 20.

[0071] The insulating protective cover 500 is made of silicone rubber, which has excellent insulation properties and can ensure the insulation effect of the insulating protective cover 500. Alternatively, the insulating protective cover 500 may be made of other insulating materials, without specific restrictions.

[0072] In one embodiment, the insulating protective cover 500 has a split structure, that is, the first protective cover 510 and the two sub-protective covers 521 are manufactured and installed separately. Furthermore, the first protective cover 510 can also adopt a split structure, making its installation more convenient and its operation more efficient. In other embodiments, the insulating protective cover can also be an integral structure, as long as it can be installed on the top of the pole to achieve the insulation function, no specific limitation is made here.

[0073] The technical content and features of this application have been disclosed above. However, it is understood that, based on the inventive concept of this application, those skilled in the art can make various changes and improvements to the above-described structure and materials, including combinations of the technical features disclosed or claimed herein, and explicitly including other combinations of these features. All such modifications and / or combinations fall within the technical field to which this application pertains and are within the scope of protection of the claims of this application.

Claims

1. A composite crossarm, characterized in that, include: Two first crossarms are fixed to the first middle part of the two first crossarms on both sides of the pole, and the length directions of the two first crossarms are in the same horizontal plane and are parallel to each other. Two first connecting components are provided, and the corresponding ends of the two first crossarms are connected together through the first connecting components. The two ends of the first connecting components are respectively used to connect two first clamps. The second connecting component connects the two corresponding middle parts of the first crossarm together to connect the second clamp, which is located below the first crossarm. Two tension members are provided, one end of which is connected to the first middle part of the two first crossarms respectively, and the other end of which is used to connect to the first clamp. The length direction of the tension members is on the same horizontal plane as the length direction of the first crossarm and is perpendicular to each other.

2. The composite crossarm according to claim 1, characterized in that, The first crossarm includes a core rod, connecting fittings, intermediate fittings, two end fittings, and an insulating layer. The connecting fittings are connected to the first middle part of the core rod and are used to connect the tension member and the pole. The intermediate fittings are connected to the second middle part of the core rod and are used to connect the second connecting assembly. The two end fittings are respectively connected to the two ends of the core rod and are used to connect the first connecting assembly. The insulating layer covers at least a portion of the outer circumferential surface of the core rod.

3. The composite crossarm according to claim 2, characterized in that, The connecting fitting is a cross-shaped fitting, which includes a first sleeve and a pole connector. The first sleeve is sleeved on the first middle part of the mandrel, and the pole connector is perpendicularly connected to the first sleeve. The pole connector is used to connect the pole.

4. The composite crossarm according to claim 3, characterized in that, The pole connector includes two first connectors, which are vertically connected to the middle of the first sleeve and located on both axial sides of the first sleeve. The first connectors are used to connect the pole.

5. The composite crossarm according to claim 4, characterized in that, The first connector includes a first plate and two second plates. The first plate and the second plates are perpendicularly connected, and the two second plates extend in the same direction from both ends of the first plate away from the first plate. The ends of the two second plates that are not connected to the first plate are perpendicularly connected to the first sleeve. The second plate is provided with a first connecting hole for connecting the pole.

6. The composite crossarm according to claim 3, characterized in that, The first sleeve has a tension connection part on the side away from the pole, and the tension connection part has a second connection hole for connecting the tension member.

7. The composite crossarm according to claim 1, characterized in that, The tension component is a tension composite insulator or a tension fitting.

8. The composite crossarm according to claim 2, characterized in that, The intermediate fitting includes a second sleeve and a second connector. The second sleeve is fitted onto the second middle part of the mandrel, and the second connector is connected to the bottom side of the second sleeve. The second connector has a third connecting hole for connecting the second connecting assembly.

9. The composite crossarm according to claim 2, characterized in that, The end fitting includes an end sleeve and a third connector. The end sleeve is fitted onto the end of the mandrel, and the third connector is connected to the top of the end sleeve. The third connector has a fourth connecting hole for connecting the first connecting assembly.

10. The composite crossarm according to claim 1, characterized in that, The composite crossarm also includes an insulating protective cover for covering the top of the pole and the metal structure in the middle of the composite crossarm.

11. The composite crossarm according to claim 10, characterized in that, The insulating protective cover includes a first protective cover and a second protective cover. The first protective cover is used to cover the top of the pole and the metal structure on the upper side of the middle of the composite crossarm. The second protective cover is used to cover the metal structure on the lower side of the middle of the composite crossarm. The top of the first protective cover is a pointed structure.

12. The composite crossarm according to claim 1, characterized in that, The composite crossarm is used to hang conductors and jumpers, with the jumpers extending and hanging below the composite crossarm.

13. The composite crossarm according to claim 12, characterized in that, The conductor includes a middle phase conductor, which is hung on the first clamps connected to the two tension members on both sides of the pole. The middle phase jumper is led out from one of the first clamps connected to the tension member and extends from below the composite crossarm to the second clamp, and then extends from below the composite crossarm to the first clamp connected to the other tension member. The middle phase jumper is electrically connected to the middle phase conductor.

14. The composite crossarm according to claim 12, characterized in that, The conductor includes a side phase conductor, which is respectively hung on two first clamps connected to both ends of the first connecting assembly on both sides of the pole. The side phase jumper is led out from the first clamp connected to one end of the first connecting assembly and extends from below the composite crossarm to the first clamp connected to the other end of the first connecting assembly. The side phase jumper is electrically connected to the side phase conductor.

15. A power transmission pole, characterized in that, It includes a pole and a composite crossarm as described in any one of claims 1-14, the composite crossarm being fixed to the pole.

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