Composite cross arm and power transmission pole

Abstract

The utility model discloses a composite cross arm which comprises two first cross arms, first middle parts of which are respectively fixed on two sides of an electric pole, and the length directions of the two first cross arms are located in the same horizontal plane and are parallel to each other; the corresponding ends of the two first cross arms are connected together through the first connecting assemblies, and the two ends of the first connecting assemblies are used for being connected with the two first wire clamps respectively; the corresponding second middle parts of the two first cross arms are connected together through the second connecting assembly and are used for connecting a second wire clamp, and the second wire clamp is located below the first cross arms; one ends of the two tension members are respectively connected with the first middle parts of the two first cross arms, the other ends of the two tension members are used for connecting the first wire clamps, and the length directions of the tension members and the length directions of the first cross arms are located on the same horizontal plane and are perpendicular to each other. According to the composite cross arm, the all-insulation horizontal structure is adopted, and the jumper wire is hung and fixed below the cross arm, so that accidents such as tripping caused by electric shock birds can be prevented, the safety is higher, and the operation and maintenance cost is lower. The utility model further discloses a power transmission pole.

Description

Technical Field

[0001] The present application relates to the technical field of overhead transmission lines, and in particular to a composite crossarm and a transmission pole. Background Art

[0002] Crossarms are components installed on poles in overhead lines, and their main function is to support the conductors. Traditional transmission poles use iron crossarms, and conductors are connected by installing insulators on the iron crossarms. When the conductors are bare conductors, birds taking off or landing from the transmission poles may simultaneously come into contact with any two conductors or any one conductor and the iron crossarm, forming an energized loop and causing electric shock. This will directly affect the normal operation of the power infrastructure, leading to accidents such as tripping, and will also cause bird deaths and reduce biodiversity. At the same time, tension iron crossarms usually use the middle part of the crossarm to raise the middle of the crossarm to perform a mid-phase jumper to ensure the insulation distance between the mid-phase jumper and other live structures. However, they are mostly free jumpers. When free jumpers are subjected to large wind loads, they will experience severe wind deflection, making it difficult to ensure sufficient insulation distance. They are also prone to electrocuting birds and causing power accidents.

[0003] Currently, insulating sheaths are usually installed around bare wires near power poles to protect birds from electric shock. However, this protection method is expensive and has poor long-term effectiveness. It requires regular replacement and maintenance, and has high operating and maintenance costs. Utility Model Content

[0004] In response to the shortcomings of the existing technology, one of the purposes of this application is to provide a composite crossarm that adopts a fully insulated horizontal structure and hangs a fixed mid-phase jumper under the crossarm, which can effectively prevent accidents such as tripping caused by electric shock to birds, thereby increasing safety and reducing operation and maintenance costs.

[0005] To achieve the above-mentioned purpose, the technical solution adopted in this application is: a composite crossarm includes: two first crossarms, the first middle parts of the two first crossarms are respectively fixed on both sides of the pole, and the length directions of the two first crossarms are located in the same horizontal plane and are parallel to each other; two first connecting components, the corresponding ends of the two first crossarms are connected together through the first connecting component, and the two ends of the first connecting component are respectively used to connect the two first wire clamps; a second connecting component, the corresponding second middle parts of the two first crossarms are connected together through the second connecting component, which are used to connect the second wire clamp, and the second wire clamp is located below the first crossarm; two tension members, one end of the two tension members is respectively connected to the first middle parts of the two first crossarms, and the other end of the two tension members is used to connect the first wire clamp, and the length direction of the tension members is located in the same horizontal plane as the length direction of the first crossarm and is perpendicular to each other.

[0006] The first cross arm comprises a core rod, a connecting fitting, an intermediate fitting, two end fittings, and an insulation layer. The connecting fitting is connected to a first middle part of the core rod and used for connecting a tension member and a pole. The intermediate fitting is connected to a second middle part of the core rod and used for connecting a second connecting assembly. The two end fittings are respectively connected to two ends of the core rod and used for connecting a first connecting assembly. The insulation layer covers at least a part of an outer circumferential surface of the core rod.

[0007] The connecting fitting is a cross-shaped fitting, and comprises a first sleeve and a pole connecting piece. The first sleeve is sleeved on the first middle part of the core rod. The pole connecting piece is connected to the first sleeve perpendicularly. The pole connecting piece is used for connecting the pole.

[0008] The pole connecting piece comprises two first connecting pieces. The two first connecting pieces are connected to a middle part of the first sleeve perpendicularly and respectively located on two sides of an axial direction of the first sleeve. The first connecting piece is used for connecting the pole.

[0009] The first connecting piece comprises a first plate piece and two second plate pieces. The first plate piece and the second plate pieces are connected perpendicularly. The two second plate pieces extend away from the first plate piece in the same direction. An end of the second plate piece, which is not connected to the first plate piece, is connected to the first sleeve perpendicularly. The second plate piece is provided with a first connecting hole used for connecting the pole.

[0010] The first sleeve is provided with a tension connecting part on a side away from the pole. The tension connecting part is provided with a second connecting hole used for connecting a tension member.

[0011] The tension member is a tension composite insulator or a tension fitting.

[0012] The intermediate fitting comprises a second sleeve and a second connecting piece. The second sleeve is sleeved on the second middle part of the core rod. The second connecting piece is connected to a bottom side of the second sleeve. The second connecting piece is provided with a third connecting hole used for connecting the second connecting assembly.

[0013] The end fitting comprises an end sleeve and a third connecting piece. The end sleeve is sleeved on the end part of the core rod. The third connecting piece is connected to a top end of the end sleeve. The third connecting piece is provided with a fourth connecting hole used for connecting the first connecting assembly.

[0014] The composite cross arm further comprises an insulation protective cover used for covering the metal structure on the top of the pole and the middle part of the composite cross arm.

[0015] The insulation protective cover comprises a first protective cover and a second protective cover. The first protective cover is used for covering the metal structure on the top of the pole and the upper side of the middle part of the composite cross arm. The second protective cover is used for covering the metal structure on the lower side of the middle part of the composite cross arm. A top part of the first protective cover is a pointed top structure.

[0016] The composite cross arm is used for hanging the conductor and the jumper wire, and the jumper wire is hung below the composite cross arm.

[0017] The conductor includes a middle-phase conductor, the middle-phase conductor is hung on the first clamp connected with the two tension members respectively at both sides of the electric pole, the middle-phase jumper wire is led out from the first clamp connected with one of the tension members and hung on the second clamp below the composite cross arm, and then hung on the first clamp connected with the other tension member below the composite cross arm, and the middle-phase jumper wire is electrically connected with the middle-phase conductor.

[0018] The conductor includes a side-phase conductor, the side-phase conductor is hung on the first clamp connected with both ends of the first connecting assembly respectively, the side-phase jumper wire is led out from the first clamp connected with one end of the first connecting assembly and hung on the first clamp connected with the other end of the first connecting assembly below the composite cross arm, and the side-phase jumper wire is electrically connected with the side-phase conductor.

[0019] The second purpose of the present application is to provide a power transmission pole, which comprises an electric pole and the composite cross arm.

[0020] The composite cross arm of the present application is an overall insulating horizontal structure, and the middle-phase jumper wire is hung below the composite cross arm through the second connecting assembly, which can avoid the wind deviation risk caused by the free jumper wire in the middle of the composite cross arm, ensure the insulation distance between the conductors on the high-voltage end of the power transmission pole and between the conductors and the top of the electric pole of the low-voltage end, prevent the electric shock of birds from causing tripping accidents, and effectively reduce the probability of birds being killed by electric shock when landing on the power transmission pole, thereby protecting biodiversity. In addition, the composite cross arm adopts an assembled structure of double horizontal cross arms, and by selecting first connecting assemblies and second connecting assemblies of different specifications, the composite cross arm can be applied to more specifications of electric poles, and the installation is more flexible and has stronger universality.

[0021] Meanwhile, the composite cross arm of the present application covers the metal structure of the top of the electric pole and the middle of the composite cross arm by the insulating protective cover, which can strengthen the insulation effect of the top of the electric pole and further reduce the probability of birds being killed by electric shock.

[0022] In addition, compared with the traditional iron cross arm, the first connecting assembly of the composite cross arm in the present application directly hangs the side-phase conductor, which can cancel the insulator structure at both ends, make the cross arm structure simpler and more convenient to install, and is not easy to rust, thereby having a longer service life. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic diagram of a power transmission pole 1000 of an embodiment of the present application.

[0024] Figure 2 is a structural schematic view of a first cross arm 100 according to an embodiment of the present application;

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

[0026] Figure 4 is a partial structural schematic view of a first cross arm 100 according to an embodiment of the present application;

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

[0028] Figure 6 is a partial structural schematic view of a power transmission pole 1000 according to another embodiment of the present application. DETAILED DESCRIPTION

[0029] In light of the requirements, a specific embodiment of the present application will be disclosed herein. However, it should be understood that the embodiments disclosed herein are merely typical examples of the present application, which can be embodied in various forms. Therefore, the specific details disclosed herein should not be considered as limiting, but merely as a representative basis for the claims and as a representative basis for teaching those skilled in the art to apply the present application in any appropriate manner in practice, including the use of various features disclosed herein and in combination with features that can not be explicitly disclosed herein.

[0030] In the present application, "connection" should be understood in a broad sense unless otherwise explicitly specified or limited, which can be direct connection or connection through an intermediate medium. In the description of the present application, it should be understood that the orientation or position relationship indicated by "upper", "lower", "end", "one end" and the like is based on the orientation or position relationship shown in the drawings, which is merely for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0031] As shown in Figure 1 The present application provides a power transmission pole 1000, which is a strain pole including a composite cross arm 10 and a pole 20, and the composite cross arm 10 is fixed on the pole 20. In a power system, the strain pole refers to a pole tower used in the middle of a line to segment the circuit to control the range of pole falling and wire breaking, and the strain pole hangs the conductor by setting a strain assembly and a strain clamp on the cross arm.

[0032] The composite cross arm 10 comprises two first cross arms 100, two first connecting assemblies 200, a second connecting assembly 300 and two strain members 400, the first middle parts of the two first cross arms 100 are fixed at the two sides of the electric pole 20 respectively, the length directions of the two first cross arms 100 are located in the same horizontal plane and are parallel to each other; the corresponding end parts of the two first cross arms 100 are connected together through the first connecting assembly 200, the two ends of the first connecting assembly 200 are used for connecting the two first wire clamps 11 respectively, so as to hang the phase conductor and the phase jumper; the corresponding second middle parts of the two first cross arms 100 are connected together through the second connecting assembly 300, which is used for connecting the second wire clamp 12, so as to hang the middle phase jumper, and the second wire clamp 12 is located below the first cross arm 100; one end of the two strain members 400 is connected to the first middle part of the two first cross arms 100 respectively, and the other end of the two strain members 400 is used for connecting the first wire clamp 11, so as to hang the middle phase conductor and the middle phase jumper, and the length direction of the strain member 400 is located in the same horizontal plane as the length direction of the first cross arm 100 and is perpendicular to each other.

[0033] The power transmission pole 1000 of the present application adopts the composite cross arm 10 to hang the conductor, the whole composite cross arm 10 adopts the full insulation horizontal structure, and the middle phase jumper is hung below through the second connecting assembly 300, which can avoid the wind deviation risk caused by the free jumper in the middle part of the composite cross arm 10, ensure the insulation distance between the conductors on the high voltage end of the power transmission pole 1000, the conductors and the top of the electric pole 20 of the low voltage end, so that no matter where the birds take off, stand or land on the power transmission pole 1000, it will not form a closed circuit, effectively prevent the tripping accident caused by electric shock of birds, and has higher safety, lower operation and maintenance cost, and can effectively reduce the probability of birds landing on the power transmission pole 1000 and being electrocuted to death, and protect biodiversity. In the traditional scheme, the strain pole hangs the conductor by setting the suspension insulator on the iron cross arm, and in the present application, the first connecting assembly 200 of the composite cross arm 10 directly hangs the phase conductor, which can cancel the insulator structure at both ends, so that the cross arm structure is simpler, the installation is more convenient, and the service life is longer.

[0034] It should be noted that the first middle part and the second middle part written in the present application refer to the parts between the two ends, not strictly to the central part. Among them, the second middle part of the first cross arm 100 is located between the first middle part of the first cross arm 100 and the end part thereof.

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

[0036] The core rod 110 is made of a composite material, for example, is made by impregnating glass fibers or aramid fibers with epoxy resin and then performing pultrusion. The composite material is more corrosion-resistant and lower in cost than the metal material of a traditional cross arm, and can achieve a significant weight reduction, making the first cross arm 100 more convenient to install.

[0037] As shown in the figure, the connecting fitting 120 is a cross-shaped fitting. The connecting fitting 120 comprises a first sleeve 121 and a pole connecting member 122. The first sleeve 121 is a hollow pipe structure, is sleeved on the first middle part of the core rod 110, and is fixed on the core rod 110 by a press-fit process. The pole connecting member 122 is connected perpendicularly to the first sleeve 121, and is used to fix the first cross arm 100 on the pole 20. Figure 3 The pole connecting member 122 comprises two first connecting members 123, which are connected perpendicularly to the middle part of the first sleeve 121 and are respectively located on the two axial sides of the first sleeve 121. The first connecting members 123 are used to connect the pole 20.

[0038]

[0039] ​The first connecting member 123 includes a first plate 1231 and two second plates 1232. The first plate 1231 and the second plate 1232 are vertically connected, and the two second plates 1232 extend in the same direction away from the two ends of the first plate 1231. The ends of the two second plates 1232 that are not connected to the first plate 1231 are vertically connected to the first sleeve 121. Both second plates 1232 are provided with a first connection hole 12321 for connecting to the pole 20. The two first connection holes 12321 are coaxially arranged and their penetration direction is perpendicular to the plate surface of the second plate 1232. The pole 20 is provided with a first mounting hole (not shown) that corresponds to and matches the first connection holes 12321. By inserting fasteners such as bolts and screws through the corresponding first connection holes 12321 and the first mounting holes, the connecting hardware 120 can be matched and connected to the pole 20. In other words, 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 the creation of electrical safety hazards. In addition, the first connecting member 123 is configured as a hollow structure, which can reduce the weight of the connecting hardware 120 while ensuring the connection strength, thereby reducing costs.

[0040] A tension connection portion 124 is provided on the side of the first sleeve 121 away from the pole 20. The tension connection portion 124 is provided with a second connection hole 1241 for connecting the tension member 400. The tension connection portion 124 can be provided in the middle of the first sleeve 121 so that the tension member 400 is more evenly stressed after installation.

[0041] The tension connection portion 124 is an L-shaped plate member, comprising a third plate member 1242 and a fourth plate member 1243, which are vertically connected. The third plate member 1242 is vertically attached to the surface of the first sleeve 121 on the side away from the pole 20. The fourth plate member 1243 is horizontally arranged and extends away from the first sleeve 121. The end of the fourth plate member 1243 connected to the third plate member 1242 is also connected to the first sleeve 121. The fourth plate member 1243 is provided with a second connection hole 1241, which extends perpendicular to the surface of the fourth plate member 1243 and is used to connect the tension member 400 via a connecting member such as a hanging ring. The third plate member 1242 strengthens the connection between the fourth plate member 1243 and the first sleeve 121, thereby ensuring a more secure installation of the tension member 400. Furthermore, the thickness of the fourth plate 1243 along the vertical direction is smaller than the height of the first sleeve 121 along the vertical direction, which can reduce the weight of the connecting hardware 120 while ensuring the connection strength of the tension member 400 and reduce costs.

[0042] like Figure 4As shown, the intermediate fitting 130 includes a second sleeve 131 and a second connecting piece 132, the second sleeve 131 is sleeved on the second middle part of the core rod 110, and the second connecting piece 132 is connected to the bottom side of the second sleeve 131, and the second connecting piece 132 is provided with a third connecting hole 1321, which is used to connect the second connecting assembly 300 through bolts, screws and other fasteners, so that the connection is not needed to be made by punching holes on the second sleeve 131 and the core rod 110, avoiding the influence of punching holes on the mechanical properties of the core rod 110, and further avoiding the generation of power safety hazards.

[0043] The second connecting piece 132 includes two fifth plate pieces 1322, which are connected to the bottom side of the second sleeve 131 and extend in the horizontal direction away from the second sleeve 131, and the two fifth plate pieces 1322 are symmetrically arranged along the axis of the second sleeve 131, that is, the two fifth plate pieces 1322 are arranged away from each other in the horizontal plane where the bottom surface of the second sleeve 131 is located, and the fifth plate piece 1322 is provided with a third connecting hole 1321, and the through direction of the third connecting hole 1321 is perpendicular to the plate surface direction of the fifth plate piece 1322. Further, the fifth plate piece 1322 is located in the middle part of the second sleeve 131, so that the second connecting assembly 300 is more uniform after installation. The thickness of the fifth plate piece 1322 in the vertical direction is less than the height of the second sleeve 131 in the vertical direction, which can reduce the weight of the intermediate fitting 130 while ensuring the connection strength of the second connecting assembly 300, and reduce the cost. The structure of the second sleeve 131 and the connection mode thereof with the core rod 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 connecting piece 142, the end sleeve 141 is sleeved on the end of the core rod 110, and the third connecting piece 142 is connected to the top end of the end sleeve 141, and the third connecting piece 142 is provided with a fourth connecting hole 1421, which is used to connect the first connecting assembly 200 through bolts, screws and other fasteners, that is, the connection is not needed to be made by punching holes on the end sleeve 141 and the core rod 110, avoiding the influence of punching holes on the mechanical properties of the core rod 110, and further avoiding the generation of power safety hazards.

[0045] The end sleeve 141 is a hollow pipe structure with one end closed, and the open end is sleeved on the outer periphery of the end of the core rod 110, and the end sleeve 141 is fixed on the end of the core rod 110 through the pressure connection process.

[0046] The third connecting piece 142 comprises two sixth plate pieces 1422 connected to the top side of the end sleeve 141 and extending in the horizontal direction away from the end sleeve 141, and the two sixth plate pieces 1422 are symmetrically arranged along the axis of the end sleeve 141, i.e., the two sixth plate pieces 1422 are arranged away from each other in the horizontal plane where the top surface of the end sleeve 141 is located, and the fourth connecting hole 1421 is arranged on the sixth plate piece 1422, and the through direction of the fourth connecting hole 1421 is perpendicular to the plate surface direction of the sixth plate piece 1422. Further, the third connecting piece 142 is located on the top side of the end of the end sleeve 141 which is not connected to the core rod 110, so as to reserve the crimping position of the end sleeve 141 and the core rod 110, and ensure the connection strength between the end fitting 140 and the core rod 110. The thickness of the sixth plate piece 1422 in the vertical direction is less than the height of the end sleeve 141 in the vertical direction, so as to reduce the weight of the end fitting 140 and reduce the cost while ensuring the connection strength of the first connecting assembly 200.

[0047] The insulation layer 150 comprises a sheath, and the insulation layer 150 is located around the core rod 110 except the connecting fitting 120, the intermediate fitting 130 and the end fitting 140, and the insulation layer 150 is sealingly connected with the connecting fitting 120, the insulation layer 150 is sealingly connected with the intermediate fitting 130, and the insulation layer 150 is sealingly connected with the end fitting 140, so as to effectively prevent the external water vapor from invading and damaging the core rod 110, and further avoid affecting the service life of the first cross arm 100. Further, the insulation layer 150 further comprises a shed arranged on the sheath in a spaced manner, so as to increase the creepage distance of the outer surface of the first cross arm 100, and in addition, the arrangement of the shed can also prevent birds from nesting and improve the overall electrical safety of the first cross arm 100.

[0048] In an embodiment, the insulation layer 150 is high-temperature vulcanized silicone rubber, and the silicone rubber material is coated on the outer periphery of the core rod 110 through a whole vacuum injection molding process, and a high-temperature vulcanized silicone rubber insulation layer is formed, and the high-temperature vulcanized silicone rubber has good aging resistance and hydrophobic migration, so as to reduce the probability of pollution flashover and rain flashover and improve the electrical safety of the first cross arm 100. In other embodiments, the insulation layer can also be formed by a molding process or pre-formed and then sleeved on the outer periphery of the core rod, which is not specifically limited here.

[0049] The cross-sectional shape and size of the first sleeve 121, the second sleeve 131 and the end sleeve 141 are matched with the cross-section of the core rod 110. In an embodiment, the cross-section of the core rod 110 is square, and each sleeve is a square tube, so as to fix each sleeve on the core rod 110, and to increase the contact area between each sleeve and the core rod 110, and to ensure the connection strength between the connecting fitting 120, the intermediate fitting 130, the end fitting 140 and the core rod 110. In other embodiments, the cross-section of the core rod 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 is matched with the cross-section of the core rod, and the present application is not limited in this respect.

[0050] In an embodiment, the material of the connecting fitting 120, the intermediate fitting 130 and the end fitting 140 can be metal (for example, iron, steel, aluminum, etc.), which is convenient to obtain and low in cost. In addition, the connecting fitting 120, the intermediate fitting 130 and the end fitting 140 are connected together by welding after being separately formed into fitting assemblies, which is reliable in connection and simple in manufacturing. In other embodiments, each fitting can also be integrally formed by casting, as long as the connection strength between each assembly is ensured, and the present application is not limited in this respect.

[0051] In combination with the above-mentioned embodiments, the present application also provides a core rod assembly. Figure 1 In combination with the above-mentioned embodiments, the present application also provides a core rod assembly. Figure 5As shown, the top sides of the end fittings 140 corresponding to the two first cross arms 100 are connected together by the first connecting assembly 200 for connecting the first wire clamp 11. The first connecting assembly 200 is an angle steel piece with an L-shaped cross section, and two groups of second mounting holes (not shown in the figure) are arranged on the first connecting assembly 200, each group including two second mounting holes, and the two second mounting holes are arranged 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 cross arms 100 together through the first connecting assembly 200; the two ends of the first connecting assembly 200 are also respectively provided with a third mounting hole (not shown in the figure) for connecting the first wire clamp 11 through a U-shaped hanging ring, i.e., the two first wire clamps 11 are connected to the two ends of the first connecting assembly 200 respectively. During installation, the two first cross arms 100 are placed horizontally and the ends of the two first cross arms 100 correspond to each other, and the first connecting assembly 200 is placed above the end fittings 140 corresponding to one end of the two first cross arms 100, so that the two groups of second mounting holes on the first connecting assembly 200 are aligned with the fourth connecting holes 1421 on the two end fittings 140 respectively, and fastening members such as bolts and nuts are passed through the corresponding second mounting holes and fourth connecting holes 1421 and fastened, so as to connect the end fittings 140 corresponding to the two first cross arms 100 on the same first connecting assembly 200, so that the one ends of the two first cross arms 100 are connected together, then the two U-shaped hanging rings are connected in the two third mounting holes respectively, and then the two first wire clamps 11 are connected to the two U-shaped hanging rings respectively, so that the assembly of the one ends of the two first cross arms 100 is completed, and finally the other ends of the two first cross arms 100 are also connected together in the above manner, and the fastening of the U-shaped hanging ring and the first wire clamp 11 can be realized by the fastening members such as bolts and nuts.

[0052] In combination Figure 1 and Figure 4 As shown, the bottom sides of the middle fittings 130 corresponding to the two first cross arms 100 are connected together by the second connecting assembly 300 for connecting the second wire clamp 12 to fix the jumper wires. The second connecting assembly 300 is an angle steel piece with an L-shaped cross section, and two groups of fourth mounting holes (not shown in the figure) are arranged on the second connecting assembly 300, each group including two fourth mounting holes, and the two fourth mounting holes are arranged corresponding to the two third connecting holes 1321 on the middle fittings 120, so as to connect the middle fittings 130 corresponding to the two first cross arms 100 together through the second connecting assembly 300; a fifth mounting hole (not shown in the figure) is arranged on the middle of the second connecting assembly 300 for connecting the second wire clamp 12 through a U-shaped hanging ring, i.e., the second wire clamp 12 is connected to the bottom side of the middle of the second connecting assembly 300. The specific installation process is similar to that of the first connecting assembly 200, and is not described herein.

[0053] The composite cross arm 10 is fixed on the electric pole 20 by the connecting fittings 120, and the two first cross arms 100 are connected together by the first connecting assembly 200 and the second connecting assembly 300 to hang the wires, that is, the composite cross arm 10 adopts the assembled structure of double horizontal cross arms, and by selecting the first connecting assembly 200 and the second connecting assembly 300 of different specifications, the composite cross arm 10 can be applied to more specifications of the electric pole 20, and the installation is more flexible and the versatility is stronger.

[0054] In combination Figure 1 and Figure 3 As shown in the figure, one end of the two strain members 400 is connected to the two connecting fittings 120 through the ball head hanger plate and the like, and the other end of the two strain members 400 is connected to the first wire clamp 11 through the ball socket hanger plate and the like. During installation, first, the two ball head hanger plates are connected to the second connecting holes 1241 of the two strain connecting parts 124 respectively, then one end of the two strain members 400 is connected to the two ball head hanger plates respectively, then the two ball socket hanger plates are connected to the other end of the two strain members 400 respectively, and finally the two first wire clamps 11 are connected to the two ball socket hanger plates respectively. The connection and fastening of the above-mentioned assemblies can be realized by fastening members such as bolts and nuts.

[0055] In an embodiment, the strain member 400 can be a strain composite insulator in the prior art, the ball head hanger plate and the ball socket hanger plate are connecting members matched with the end fittings of the strain composite insulator in the prior art, the first wire clamp 11 can be a strain clamp in the prior art, and the second wire clamp 12 can be a suspension clamp in the prior art. In other embodiments, the strain member can also be a strain fitting in the prior art, and corresponding connecting members can be replaced according to the installation requirements, and the first wire clamp and the second wire clamp can also adopt other wire clamp structures as long as they can realize the corresponding wire hanging function, which is not limited specifically herein.

[0056] When installing the composite crossarm 10, first select the first connecting component 200 and the second connecting component 300 of the corresponding specifications according to the size of the pole 20, then connect the end fittings 140 corresponding to the two first crossarms 100 together through the first connecting component 200, and install the first wire clamps 11 at both ends of the first connecting component 200; then connect the intermediate fittings 130 corresponding to the two first crossarms 100 together through the second connecting component 300, and install the second wire 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 wire clamps 11 at the other end of the two tension members 400 respectively; finally, put the two preliminarily assembled first crossarms 100 at the appropriate position on the top of the pole 20, and fix the two first crossarms 100 on both sides of the pole 20 respectively through the two connecting fittings 120, so that the composite crossarm 10 can be installed and fixed on the pole 20. The entire installation process is simple and convenient.

[0057] When a single-loop three-phase conductor is hung on a composite crossarm 10, the three-phase conductor includes two side-phase conductors, one middle-phase conductor, and jumpers corresponding to the three phase conductors. The two side-phase conductors are respectively hung on the ends of the composite crossarm 10, the middle-phase conductor is hung on the tension member 400 in the middle of the composite crossarm 10, and the jumper is extended and hung below the composite crossarm 10. The hanging structure of the side-phase conductor is specifically explained using one phase as an example. Along the conductor extension direction, the side-phase conductor is hung on two first clamps 11 connected to the two 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 the bottom of the composite crossarm 10 to be hung on 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 wire clamps 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 wire clamp 11 connected to one of the tension members 400 and extends from the bottom of the composite crossarm 10 to be hung on the second wire clamp 12 in the middle of the second connecting assembly 300, and then extends from the bottom of the composite crossarm 10 to be hung on the first wire 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 mid-phase jumper point may be provided on the composite crossarm 10 , that is, an intermediate hardware 130 may be provided on the first crossarm 100 , and the bottom sides of the intermediate hardware 130 of the two first crossarms 100 are connected together through the second connecting assembly 300 .

[0059] In another embodiment, Figure 1As shown, the composite crossarm 10 can be provided with two mid-phase jumper points. Specifically, the first crossarm 100 can be provided with two intermediate fittings 130, one on either side of the connecting fitting 120. The bottom sides of the intermediate fittings 130 corresponding to the two first crossarms 100 can be connected together via a second connecting assembly 300. When hanging the line, one of the mid-phase jumper points can be selected to fix the jumper according to the hanging requirements of the transmission pole 1000, making the hanging more flexible and applicable to a wider range of scenarios.

[0060] Furthermore, the first crossarm 10 can be set to 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 respectively located at the quarter-division point or the fifth-division point of the first crossarm 100, so that the composite crossarm 10 is more evenly stressed after installation and the structure is more stable.

[0061] It can be understood that the overall length of the composite crossarm 10 of the present application, the length of the first crossarm 100, the specifications of the first wire clamp 11 and the second wire clamp 12, etc. can be adjusted accordingly according to needs; and the installation order of the composite crossarm 10 can also be adjusted accordingly according to needs, that is, the two first crossarms 100 can be fixed on the pole 20 first, and 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] Further, if Figure 6 As shown, the composite crossarm 10 also includes an insulating protective cover 500, which 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, and 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 cooperate to cover the top of the pole 20 and the metal structure in the middle of the composite crossarm 10 to enhance the insulation effect of the top of the pole 20, further preventing birds from forming an energized circuit and electrocuting the birds when they take off, stand or land on the top of the pole 20, further reducing the chance of birds being electrocuted to death and protecting biodiversity.

[0063] The main structure of the insulating protective cover 500 is a rectangular parallelepiped structure with an open bottom, which is convenient for installation of the insulating protective cover 500 ; and the insulating protective cover 500 is provided with a plurality of cavities for passing part of the structure of the composite cross arm 10 or fasteners such as bolts and nuts.

[0064] The main body structure of the first protective cover 510 is a bottom-opened cuboid structure, after the composite cross arm 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 wire extension direction matches the distance between the sides of the two first sleeves 121 away from each other, and the length of the cuboid structure in the length direction of the first cross arm 100 matches the length of the pole 20 in the direction, so that the first protective cover 510 can cover the top of the pole 20 from top to bottom while saving material cost.

[0065] The first protective cover 510 is provided with a plurality of first cavities, four second cavities and two third cavities (not shown in the figure), the plurality of first cavities are arranged corresponding to the first mounting holes on the pole 20, the four second cavities are arranged corresponding to the mounting positions of the first cross arm 100, and the two third cavities are arranged corresponding to the mounting positions of the strain member 400, which facilitates the installation of fasteners and the composite cross arm 10 while ensuring the insulation effect.

[0066] Further, the second cavities of the first protective cover 510 are each extended to be provided with a third protective cover 530, the extension direction of the third protective cover 530 is the same as the length direction of the first cross arm 100, and the third protective cover 530 is used to cover the metal structure of the connecting hardware 120 protruding from the pole 20 in the length direction of the first cross arm 100; the third cavities of the first protective cover 510 are each extended to be provided with a fourth protective cover 540, the extension direction of the fourth protective cover 540 is the same as the length direction of the strain member 400, and the fourth protective cover 540 is used to cover the metal connecting structure between the strain member 400 and the connecting hardware 120, and the main body 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 metal structure covered by the third protective cover 530 and the fourth protective cover 540.

[0067] The main body structure of the second protective cover 520 is a cuboid structure with openings at the bottom and the top, the length and the width of the cuboid structure are the same as those of the main body structure of the first protective cover 510, and the height of the cuboid structure in the vertical direction 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 a plurality of fourth cavities, and the plurality of fourth cavities are arranged corresponding to the first mounting holes on the pole 20, which facilitates the installation of fasteners while ensuring the insulation effect.

[0068] Further, the second protective cover 520 can include two sub-protective covers 521, and the two sub-protective covers 521 are three-opened cuboid structures, and the two sub-protective covers 521 can form the second protective cover 520 after being spliced, so that the second protective cover 520 can be installed and covered from both sides of the pole 20, and the operation is simpler and more convenient.

[0069] Further, the top of the first protective cover 510 is a pointed top structure, that is, the top of the main body structure of the first protective cover 510, the third protective cover 530 and the fourth protective cover 540 are pointed top structures, and the pointed ends of the pointed top structures are upwardly arranged. In this way, when the first protective cover 510 is installed, the pointed top structure can avoid birds standing and staying on the top of the pole 20 and the middle part of the composite cross arm 10, further reducing the probability of birds being electrocuted to death, and protecting biodiversity. The pointed top structure can be a circular cone or a prismatic structure, which is simple in structure and convenient to manufacture.

[0070] Further, the insulating protective cover 500 further comprises a fastener protective cover 550 for covering the nuts and other fasteners that need to be threaded during the installation of the composite cross arm 10 and the pole 20, further improving the coverage rate of the metal structure at the top of the pole 20 and the middle part of the composite cross arm 10, thereby further enhancing 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 performance and can ensure the insulation effect of the insulating protective cover 500. Alternatively, the insulating protective cover 500 can also be made of other insulating materials, which is not limited herein.

[0072] In the present embodiment, the insulating protective cover 500 is a split structure, that is, the first protective cover 510 and the two sub-protective covers 521 are respectively manufactured and installed. In other embodiments, the insulating protective cover can also be a one-piece structure, as long as it can be installed and covered on the top of the pole to achieve the insulation function, which is not limited herein.

[0073] The technical content and technical features of the present application have been disclosed as above. However, it can be understood that under the creative idea of the present application, those skilled in the art can make various changes and improvements to the above structure and material, including the combination of technical features disclosed or claimed herein, and obviously including other combinations of these features. These modifications and / or combinations all fall within the technical field involved by the present application, and fall within the protection scope of the claims of the present application.

Claims

1. A composite cross arm, characterized in that: include: Two first cross arms, wherein the first middle portions of the two first cross arms are respectively fixed on both sides of the pole, and the length directions of the two first cross arms are located in the same horizontal plane and are parallel to each other; Two first connecting assemblies, where the corresponding ends of the two first crossarms are connected together via the first connecting assemblies, and the two ends of the first connecting assemblies are respectively used to connect to the two first clamps; A second connecting assembly, wherein the second middle portions corresponding to the two first crossarms are connected together through the second connecting assembly, and is used to connect a second wire clamp, wherein the second wire clamp is located below the first crossarm; Two tension members, one end of the two tension members is respectively connected to the first middle part of the two first cross arms, the other end of the two tension members is used to connect to the first wire clamp, the length direction of the tension member and the length direction of the first cross arm are located in the same horizontal plane and are perpendicular to each other.

2. The composite cross arm according to claim 1, characterized in that: The first cross arm includes a core rod, a connecting hardware, an intermediate hardware, two end hardware, and an insulating layer. The connecting hardware is connected to the first middle part of the core rod for connecting the tension member and the pole; the intermediate hardware is connected to the second middle part of the core rod for connecting the second connecting assembly; the two end hardware are respectively connected to the two ends of the core rod for connecting the first connecting assembly; the insulating layer covers at least part of the outer circumference of the core rod.

3. The composite cross arm according to claim 2, characterized in that: The connecting hardware is a cross-shaped hardware, and the connecting hardware includes a first sleeve and a pole connecting piece. The first sleeve is sleeved on the first middle part of the core rod, and the pole connecting piece is vertically connected to the first sleeve. The pole connecting piece is used to connect the pole.

4. The composite cross arm 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 are respectively located on both sides of the axial direction of the first sleeve. The first connectors are used to connect the pole.

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

6. The composite cross arm according to claim 3, characterized in that: A tension-resistant connecting portion is provided on a side of the first sleeve away from the electric pole, and a second connecting hole is provided on the tension-resistant connecting portion for connecting the tension-resistant member.

7. The composite cross arm according to claim 1, characterized in that: The tension-resistant parts are tension-resistant composite insulators or tension-resistant hardware.

8. The composite cross arm according to claim 2, characterized in that: The intermediate hardware includes a second sleeve and a second connecting piece. The second sleeve is sleeved on the second middle part of the core rod. The second connecting piece is connected to the bottom side of the second sleeve. The second connecting piece is provided with a third connecting hole for connecting the second connecting assembly.

9. The composite cross arm according to claim 2, characterized in that: The end fitting includes an end sleeve and a third connecting piece. The end sleeve is sleeved on the end of the core rod. The third connecting piece is connected to the top end of the end sleeve. The third connecting piece is provided with a fourth connecting hole for connecting to the first connecting assembly.

10. The composite cross arm according to claim 1, characterized in that: The composite cross arm further comprises an insulating protective cover for covering the top of the pole and the metal structure in the middle of the composite cross arm.

11. The composite cross arm 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 middle side of the composite crossarm. The second protective cover is used to cover the metal structure on the lower middle side of the composite crossarm. The top of the first protective cover is a pointed roof structure.

12. The composite cross arm according to claim 1, characterized in that: The composite cross arm is used for hanging conductors and jumpers, and the jumpers are extended and hung below the composite cross arm.

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

14. The composite cross arm according to claim 12, characterized in that: The conductors include side phase conductors, which are respectively hung on the two first wire clamps connected at both ends of the first connecting component on both sides of the pole. The side phase jumper is led out from the first wire clamp connected to one end of the first connecting component and extends from the bottom of the composite crossarm to be hung on the first wire clamp connected to the other end of the first connecting component, and the side phase jumper is electrically connected to the side phase conductors.

15. A transmission pole, characterized in that: It comprises an electric pole and the composite cross arm according to any one of claims 1 to 14, wherein the composite cross arm is fixed on the electric pole.

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