Composite cross arm and power transmission pole

Abstract

The invention 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 invention further discloses a power transmission pole.

Description

Technical Field

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

[0002] Crossarms are components installed on poles in overhead lines, and their main function is to support conductors. Traditional transmission poles use iron crossarms, and conductors are hung by installing insulators on the iron crossarms. When the conductors are bare conductors, birds taking off or landing on the transmission poles may touch any two conductors or any one conductor and the iron crossarm at the same time, forming an energized circuit and causing electric shock, which will directly affect the normal operation of the power infrastructure and cause accidents such as tripping. It 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 mid-phase jumpers to ensure the insulation distance between the mid-phase jumper and other live structures, but they are mostly in the form of free jumpers. When the free jumper is subjected to a large wind load, it will cause serious wind deviation, making it difficult to ensure sufficient insulation distance, and it is also easy to cause electric shocks to birds and cause power accidents.

[0003] At present, insulating sheaths are usually installed around bare wires near poles to protect birds from electric shocks. However, this protection method is expensive and has poor long-term effects. It requires regular replacement and maintenance, and has high operating and maintenance costs. Summary of the invention

[0004] In view of the shortcomings of the prior art, 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 shocks to birds, thereby increasing safety and reducing operation and maintenance costs.

[0005] To achieve the above-mentioned purpose, the technical solution adopted in the present 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 components, and the two ends of the first connecting components 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 ends of the two tension members are 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 are perpendicular to each other.

[0006] Among them, 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 component; the two end hardware are respectively connected to the two ends of the core rod for connecting the first connecting component; the insulating layer covers at least part of the outer circumference of the core rod.

[0007] Among them, the connecting hardware is a cross-shaped hardware, which includes 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 vertically connected to the first sleeve, and the pole connecting piece is used to connect the pole.

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

[0009] Among them, 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 the two ends of the first plate in a direction away from the first plate, and one end of the two second plates not connected to the first plate is vertically connected to the first sleeve; a first connecting hole is provided on the second plate for connecting to the electric pole.

[0010] Wherein, a tension connection portion is provided on a side of the first sleeve away from the pole, and a second connection hole is provided on the tension connection portion for connecting the tension member.

[0011] Among them, the tension parts are tension composite insulators or tension fittings.

[0012] Among them, 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, and the second connecting piece is provided with a third connecting hole for connecting the second connecting assembly.

[0013] Among them, the end hardware includes an end sleeve and a third connecting piece. The end sleeve is sleeved on the end of the core rod, and the third connecting piece is connected to the top of the end sleeve. The third connecting piece is provided with a fourth connecting hole for connecting the first connecting component.

[0014] The composite cross arm also includes an insulating protective cover, which is used to cover the top of the pole and the metal structure in the middle of the composite cross arm.

[0015] Among them, 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 structure.

[0016] The composite cross arm is used for hanging conductors and jumpers, and the jumpers are extended and hung below the composite cross arm.

[0017] Among them, the conductor includes a middle-phase conductor, which is respectively hung on the first wire clamps connected to 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.

[0018] Among them, the conductors include side phase conductors, which are respectively hung on 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 conductor.

[0019] The second object of the present application is to provide a transmission pole, comprising a pole and the aforementioned composite cross arm, wherein the composite cross arm is fixed on the pole.

[0020] The beneficial effects of the present application are as follows: Different from the prior art, the composite cross arm of the present application adopts a fully insulated horizontal structure as a whole, and a fixed mid-phase jumper is hung below it through the second connecting component, which can avoid the risk of wind deflection caused by the free jumper in the middle of the composite cross arm, and ensure the insulation distance between the wires at the high-voltage end of the transmission pole and between the wires and the top of the pole at the low-voltage end, so that birds will not form a power circuit no matter where they take off, stand or land on the transmission pole, effectively preventing accidents such as tripping caused by electric shock to birds, with higher safety and lower operation and maintenance costs. At the same time, it can effectively reduce the probability of birds being electrocuted to death when landing on the transmission pole, and protect biodiversity. In addition, the composite cross arm adopts an assembled structure of double horizontal cross arms. By selecting first connecting components and second connecting components of different specifications, the composite cross arm can be applied to poles of more specifications, with more flexible installation and stronger versatility.

[0021] At the same time, the composite cross arm of the present application uses an insulating protective cover to cover the top of the pole and the metal structure in the middle of the composite cross arm, which can enhance the insulation effect of the top of the pole and further reduce the probability of birds being electrocuted to death.

[0022] In addition, compared with traditional iron crossarms, the first connecting component of the composite crossarm used in the present application is directly connected to the side phase conductor, which can eliminate the insulator structure at both ends, making the crossarm structure simpler, easier to install, less prone to rust, and longer in service life. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

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

[0028] Figure 6 It is a schematic diagram of the partial structure of a transmission pole 1000 according to another embodiment of the present application. DETAILED DESCRIPTION

[0029] Upon request, specific embodiments 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 may be embodied in various forms. Therefore, the specific details disclosed herein are not considered to be limiting, but merely as a basis for the claims and as a representative basis for teaching those skilled in the art to apply the present application differently in any appropriate manner in practice, including using the various features disclosed herein and combining features that may not be explicitly disclosed herein.

[0030] The "connection" described in this application should be understood in a broad sense, unless otherwise clearly specified or limited, and can be directly connected or connected through an intermediate medium. In the description of this application, it should be understood that the orientation or position relationship indicated by "upper", "lower", "end", "one end", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0031] like Figure 1 As shown, the present application provides a transmission pole 1000, which is a tension pole. The tension pole includes a composite cross arm 10 and a pole 20, and the composite cross arm 10 is fixed on the pole 20. In the power system, the tension pole refers to a pole tower used to segment the circuit in the middle of the line to control the range of pole collapse and line breakage. The tension pole is provided with tension components and tension clamps on the cross arm to hang the conductor.

[0032] The composite crossarm 10 includes two first crossarms 100, two first connection components 200, a second connection component 300 and two tension members 400. The first middle portions 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 through the first connection component 200. The two ends of the first connection component 200 are respectively used to connect the two first wire clamps 11 to hang the side phase conductor and the side phase jumper. The second middle parts corresponding to the two first crossarms 100 are connected together through the second connecting assembly 300, which is used to connect the second wire clamp 12 to hang the middle-phase jumper. The second wire clamp 12 is located below the first crossarm 100; one end of the two tension members 400 is respectively connected to the first middle parts of the two first crossarms 100, and the other ends of the two tension members 400 are used to connect the first wire clamp 11 to hang the middle-phase conductor and the middle-phase jumper. The length direction of the tension member 400 is located in 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 the present application adopts a composite cross arm 10 to hang the conductor. The composite cross arm 10 adopts a fully insulated horizontal structure as a whole, and a fixed middle phase jumper is hung below it through the second connecting assembly 300, which can avoid the risk of wind deflection caused by the free jumper in the middle of the composite cross arm 10, and ensure the insulation distance between the conductors at the high-voltage end of the transmission pole 1000 and between the conductors and the top of the pole 20 at the low-voltage end, so that the birds will not form an electric circuit no matter where they take off, stand or land on the transmission pole 1000, effectively preventing accidents such as tripping caused by electric shock to birds, with higher safety and lower operation and maintenance costs. At the same time, it can effectively reduce the probability of birds landing on the transmission pole 1000 and being electrocuted to death, protecting biodiversity. In the traditional solution, the tension pole is hung by setting a suspension insulator on the iron cross arm to hang the conductor. In the present application, the first connecting assembly 200 of the composite cross arm 10 is used to directly hang the side phase conductor, which can cancel the insulator structure at both ends, making the cross arm structure simpler, more convenient to install, less prone to rust, and longer service life.

[0034] It should be noted that the first middle portion and the second middle portion in the present application refer to the portion between the two ends, not strictly the central portion. The second middle portion of the first cross arm 100 is located between the first middle portion of the first cross arm 100 and its end.

[0035] like Figure 2As shown, the first cross arm 100 includes a core rod 110 (the marks in the figure are for schematic representation only), a connecting fitting 120, an intermediate fitting 130, two end fittings 140, and an insulating layer 150. The connecting fitting 120 is connected to the first middle part of the core rod 110 for connecting the tension member 400 and the pole 20; the intermediate fitting 130 is connected to the second middle part of the core rod 110 for connecting the second connecting assembly 300; the two end fittings 140 are respectively connected to the two ends of the core rod 110 for connecting the first connecting assembly 200; the insulating layer 150 covers at least a portion of the outer circumference of the core rod 110.

[0036] The core rod 110 is made of composite material, for example, glass fiber or aramid fiber impregnated with epoxy resin and then pultruded. Compared with the metal material of traditional crossarms, composite materials are more corrosion-resistant and low-cost, and can achieve significant weight reduction, making the first crossarm 100 more convenient to install.

[0037] like Figure 3 As shown, the connecting fitting 120 is a cross-shaped fitting, and the connecting fitting 120 includes a first sleeve 121 and a pole connecting piece 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 pipe structure, which is sleeved on the first middle part of the core rod 110, and the first sleeve 121 is fixed to the core rod 110 by a crimping process; the pole connecting piece 122 is vertically connected to the first sleeve 121, and is used to fix the first cross arm 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 are respectively located on two axial sides of the first sleeve 121 . The first connectors 123 are used to connect the pole 20 .

[0039] The first connecting member 123 includes a first plate member 1231 and two second plate members 1232. The first plate member 1231 and the second plate members 1232 are vertically connected, and the two second plate members 1232 extend in the same direction away from the two ends of the first plate member 1231, and one end of the two second plate members 1232 that is not connected to the first plate member 1231 is vertically connected to the first sleeve 121. The two second plates 1232 are both provided with a first connection hole 12321 for connecting the electric 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 electric pole 20 is provided with a first mounting hole (not shown) corresponding to the first connection hole 12321. By inserting bolts, screws and other fasteners in the corresponding first connection holes 12321 and the first mounting holes, the connection hardware 120 can be matched and connected with the electric pole 20, that is, there is no need to punch holes on the first sleeve 121 and the core rod 110 for connection, so as to avoid the drilling affecting the mechanical properties of the core rod 110, thereby avoiding the potential safety hazards of electricity. In addition, the first connection member 123 is set as a hollow structure, which can reduce the weight of the connection hardware 120 while ensuring the connection strength, thereby reducing the cost.

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

[0041] The tension connection part 124 is an L-shaped plate, including a third plate 1242 and a fourth plate 1243 connected vertically. The third plate 1242 is closely connected to the plate surface of the first sleeve 121 away from the pole 20 in the vertical direction; the fourth plate 1243 is arranged in the horizontal direction and extends in the direction away from the first sleeve 121. The end of the fourth plate 1243 connected to the third plate 1242 is also connected to the first sleeve 121. The fourth plate 1243 is provided with a second connection hole 1241, and the through direction of the second connection hole 1241 is perpendicular to the plate surface direction of the fourth plate 1243, which is used to connect the tension member 400 through a connection member such as a hanging ring. The third plate 1242 can strengthen the connection strength between the fourth plate 1243 and the first sleeve 121, thereby making the installation of the tension member 400 more stable. Furthermore, the thickness of the fourth plate 1243 along the vertical direction is less 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, thereby reducing the cost.

[0042] like Figure 4As shown, the intermediate hardware 130 includes a second sleeve 131 and a second connecting member 132. The second sleeve 131 is sleeved on the second middle part of the core rod 110, and the second connecting member 132 is connected to the bottom side of the second sleeve 131. The second connecting member 132 is provided with a third connecting hole 1321, which is used to connect the second connecting assembly 300 by fasteners such as bolts and screws, so that there is no need to drill holes on the second sleeve 131 and the core rod 110 for connection, thereby avoiding the drilling affecting the mechanical properties of the core rod 110, and thus avoiding the occurrence of electrical safety hazards.

[0043] The second connecting member 132 includes two fifth plates 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. The two fifth plates 1322 are symmetrically arranged along the axis of the second sleeve 131, that is, the two fifth plates 1322 are arranged away from each other in the horizontal plane where the bottom surface of the second sleeve 131 is located. The fifth plate 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 1322. Further, the fifth plate 1322 is located in the middle of the second sleeve 131, so that the force of the second connecting assembly 300 is more uniform after installation. The thickness of the fifth plate 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 hardware 130 while ensuring the connection strength of the second connecting assembly 300, thereby reducing the cost. The structure of the second sleeve 131 and the connection method with the core rod 110 are similar to those of the first sleeve 121 .

[0044] like Figure 5 As shown, the end fitting 140 includes an end sleeve 141 and a third connecting member 142. The end sleeve 141 is sleeved on the end of the core rod 110, and the third connecting member 142 is connected to the top of the end sleeve 141. The third connecting member 142 is provided with a fourth connecting hole 1421 for connecting the first connecting assembly 200 by fasteners such as bolts and screws. That is, there is no need to drill holes on the end sleeve 141 and the core rod 110 for connection, thereby avoiding drilling to affect the mechanical properties of the core rod 110, thereby avoiding electrical safety hazards.

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

[0046] The third connecting member 142 includes two sixth plates 1422, which are connected to the top side of the end sleeve 141 and extend in the horizontal direction away from the end sleeve 141. The two sixth plates 1422 are symmetrically arranged along the axis of the end sleeve 141, that is, the two sixth plates 1422 are arranged away from each other in the horizontal plane where the top surface of the end sleeve 141 is located. The sixth plate 1422 is provided with a fourth connecting hole 1421, and the through direction of the fourth connecting hole 1421 is perpendicular to the plate surface direction of the sixth plate 1422. Furthermore, the third connecting member 142 is located at the top side of the end sleeve 141 that 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 hardware 140 and the core rod 110. The thickness of the sixth plate 1422 along the vertical direction is smaller than the height of the end sleeve 141 along the vertical direction, which can reduce the weight of the end fitting 140 while ensuring the connection strength of the first connecting assembly 200 and reduce the cost.

[0047] The insulating layer 150 includes a sheath, and the insulating layer 150 is located on the periphery of other areas of the core rod 110 except the connecting hardware 120, the intermediate hardware 130 and the end hardware 140. The insulating layer 150 and the connecting hardware 120, the insulating layer 150 and the intermediate hardware 130, and the insulating layer 150 and the end hardware 140 are all sealed, which can effectively prevent the external water vapor from invading and damaging the core rod 110, thereby avoiding affecting the service life of the first cross arm 100. Furthermore, the insulating layer 150 also includes sheds arranged at intervals on the sheath, which can increase the creepage distance of the outer surface of the first cross arm 100. In addition, the setting of the sheds can also prevent birds from nesting, thereby improving the overall electrical safety of the first cross arm 100.

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

[0049] The cross-sectional shapes and sizes 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 cross-sectional shape of the mandrel 110 is square, and each sleeve is a square tube, so that each sleeve can be fixed on the mandrel 110, and the contact area between each sleeve and the mandrel 110 can be increased, and the connection strength between the connecting hardware 120, the intermediate hardware 130, the end hardware 140 and the mandrel 110 can be ensured. 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 can match the cross-sectional shape of the mandrel, and there is no limitation here.

[0050] In one 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 easy to obtain and has low cost. In addition, the connecting fitting 120, the intermediate fitting 130, and the end fitting 140 are all formed by welding after being separately formed into fitting components, which is reliable and easy to manufacture. In other embodiments, each fitting can also be integrally formed by casting or other methods, as long as the connection strength between the components can be guaranteed, and no specific limitation is made here.

[0051] Combination Figure 1 and Figure 5As shown, the top sides of the end fittings 140 corresponding to the two first crossarms 100 are connected together through the first connecting assembly 200, which is used to connect the first wire clamp 11. The first connecting assembly 200 is an angle steel piece with an L-shaped cross section. Two groups of second mounting holes (not shown) are arranged on the first connecting assembly 200 at intervals, each group includes two second mounting holes, and the two second mounting holes are arranged corresponding to the two fourth connecting holes 1421 on the end fitting 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) is also provided at both ends of the first connecting assembly 200, which is used to connect the first wire clamp 11 through 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 cross arms 100 are placed horizontally and the ends of the two first cross arms 100 are aligned with each other, and the first connecting assembly 200 is placed above the end fittings 140 at 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 respectively aligned with the fourth connecting holes 1421 on the two end fittings 140, and the two first cross arms 100 are fastened by inserting mutually matching bolts, nuts and other fasteners in the corresponding second mounting holes and fourth connecting holes 1421 and tightening them. 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, and then the two U-shaped hanging rings are respectively connected to the two third mounting holes, and then the two first wire clamps 11 are respectively connected to the two U-shaped hanging rings, and the assembly of the corresponding ends of the two first crossarms 100 can be completed. Finally, the other ends corresponding to the two first crossarms 100 are also connected together in the above manner. The fastening of the above-mentioned U-shaped hanging rings and the first wire clamps 11 can be achieved by fasteners such as bolts and nuts.

[0052] Combination Figure 1 and Figure 4 As shown, the bottom sides of the intermediate fittings 130 corresponding to the two first crossarms 100 are connected together through 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. Two groups of fourth mounting holes (not shown) are arranged on the second connecting assembly 300 at intervals, each group includes two fourth mounting holes, and the two fourth mounting holes are arranged corresponding to the two third connecting holes 1321 on the intermediate fitting 120, so as to connect the intermediate fittings 130 corresponding to the two first crossarms 100 together through the second connecting assembly 300; a fifth mounting hole (not shown) is provided in the middle of the second connecting assembly 300, which is used to connect the second wire clamp 12 through a U-shaped hanging ring, 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 repeated.

[0053] The composite crossarm 10 fixes the first crossarm 100 on 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 wires, that is, the composite crossarm 10 adopts an assembled structure of double horizontal crossarms. By selecting first connecting components 200 and second connecting components 300 of different specifications, the composite crossarm 10 can be applied to poles 20 of more specifications, and the installation is more flexible and more versatile.

[0054] Combination Figure 1 and Figure 3 As shown, one end of the two tension members 400 is connected to the two connection fittings 120 through a ball head hanging plate, etc., and the other end of the two tension members 400 is connected to the first wire clamp 11 through a ball socket hanging plate, etc. During installation, first connect the two ball head hanging plates to the second connection holes 1241 of the two tension connection parts 124, then connect one end of the two tension members 400 to the two ball head hanging plates, then connect the two ball socket hanging plates to the other end of the two tension members 400, and finally connect the two first wire clamps 11 to the two ball socket hanging plates. The connection and fastening of the above-mentioned components can be achieved by fasteners such as bolts and nuts.

[0055] In one embodiment, the tension member 400 may be a tension composite insulator in the prior art, the ball head hanging plate and the ball socket hanging plate are connectors in the prior art that match the hardware at both ends of the tension composite insulator, the first wire clamp 11 may be a tension wire clamp in the prior art, and the second wire clamp 12 may be a suspension wire clamp in the prior art. In other embodiments, the tension member may also be a tension hardware in the prior art, and the corresponding connector may be replaced according to its installation requirements, and the first wire clamp and the second wire clamp may also adopt other wire clamp structures, as long as the corresponding wire hanging function can be achieved, and no specific restrictions are made here.

[0056] When installing the composite crossarm 10, first select the first connecting component 200 and the second connecting component 300 of 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 respectively; then connect the middle 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, sleeve 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, and the whole installation process is simple and convenient to operate.

[0057] When the composite cross arm 10 is hung with a single-loop three-phase conductor, the three-phase conductor includes two-phase side phase conductors and one-phase middle phase conductor and jumpers corresponding to the three-phase conductors. The two-phase side phase conductors are hung on the two ends of the composite cross arm 10, the middle phase conductor is hung on the tension member 400 in the middle of the composite cross arm 10, and the jumper is extended and hung below the composite cross arm 10. The hanging structure of the side phase conductor is specifically described by taking one phase as an example. Along the extension direction of the conductor, the side phase conductor is hung on the two first wire clamps 11 connected to the two ends of the first connecting assembly 200 on both sides of the pole 20, respectively. The side phase jumper is led out from the first wire clamp 11 connected to one end of the first connecting assembly 200 and extends from the bottom of the composite cross arm 10 to be hung on the first wire clamp 11 connected to the other end of the first connecting assembly 200, and 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, and 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, and 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, two mid-phase jumper points can be set on the composite crossarm 10, that is, two intermediate hardware 130 can be set on the first crossarm 100, and the two intermediate hardware 130 are respectively located on both sides of the connecting hardware 120, and the bottom sides of the intermediate hardware 130 corresponding to the two first crossarms 100 can be connected together through the 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 line requirements of the transmission pole 1000, so that the hanging line is more flexible and has a wider application scenario.

[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, and no specific restrictions are made here.

[0062] Furthermore, 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 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 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 prevent birds from being electrocuted when they take off, stand or land on the top of the pole 20 due to the formation of an energized circuit, thereby further reducing the probability 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 installing the insulating protective cover 500; and the insulating protective cover 500 is provided with a plurality of cavities for passing partial structures of the composite cross arm 10 or fasteners such as bolts and nuts.

[0064] The main structure of the first protective cover 510 is a rectangular structure with an open bottom. After the composite crossarm 10 is installed on the pole 20, the height of the rectangular structure in the vertical direction matches the distance from the top of the pole 20 to the bottom side of the first sleeve 121, the width of the rectangular structure along the extension direction of the conductor matches the distance between the two sides of the first sleeves 121 facing away from each other, and the length of the rectangular structure along the length direction of the first crossarm 100 matches the length of the pole 20 along this 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 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 position of the first crossarm 100, and the two third cavities are arranged corresponding to the mounting position of the tension member 400, which facilitates the insertion of fasteners and the installation of the composite crossarm 10 while ensuring the insulation effect.

[0066] Furthermore, a third protective cover 530 is extended outside the second cavity of the first protective cover 510, and the extension direction of the third protective cover 530 is the same as the length direction of the first crossarm 100, and 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 is extended outside the third cavity of the first protective cover 510, and the extension direction of the fourth protective cover 540 is the same as the length direction of the tension member 400, and 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 rectangular structure, and the size of the rectangular structure matches the size of the corresponding metal structure.

[0067] The main structure of the second protective cover 520 is a rectangular structure with openings at the bottom and the top. The length and width of the rectangular structure are the same as those of the main structure of the first protective cover 510. The height of the rectangular structure in the vertical direction matches the distance from the bottom side of the first sleeve 121 to 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, which are arranged corresponding to the first mounting holes on the pole 20, so as to facilitate the insertion of fasteners while ensuring the insulation effect.

[0068] Furthermore, the second protective cover 520 may include two sub-protective covers 521, which are rectangular structures with openings on three sides. The two sub-protective covers 521 can be assembled to form a 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 top of the third protective cover 530, and the top of the fourth protective cover 540 are all pointed structures, and the tip of the pointed structure is set upward, so that when the first protective cover 510 is installed, the pointed structure can prevent birds from standing and staying on the top of the pole 20 and the middle of the composite cross arm 10, further reducing the probability of birds being electrocuted and dying, and protecting biodiversity. The pointed structure can be a cone or pyramid structure, which is simple in structure and easy to manufacture.

[0070] Furthermore, the insulating protective cover 500 also includes a fastener protective cover 550, which is used to cover fasteners such as nuts that need to be inserted during the installation of the composite crossarm 10 and the pole 20, further improving the coverage rate of the metal structure at the top of the pole 20 and the middle of the composite crossarm 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 insulating properties and can ensure the insulating 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 here.

[0072] In this 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 manufactured and installed separately. In other embodiments, the insulating protective cover can also be an integrated structure, as long as the cover can be installed on the top of the pole to achieve the insulation function, there is no limitation here.

[0073] The technical content and technical features of the present application have been disclosed above. However, it is understood that, under the creative concept of the present application, those skilled in the art can make various changes and improvements to the above structures and materials, including combinations of technical features disclosed or claimed separately herein, and obviously including other combinations of these features. These variations and / or combinations all fall within the technical field involved in 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 connection components, the ends corresponding to the two first cross arms are connected together through the first connection components, and the two ends of the first connection components are respectively used to connect two first wire clamps; A second connecting component, wherein the second middle portions corresponding to the two first cross arms are connected together through the second connecting component, and are used to connect a second wire clamp, and the second wire clamp is located below the first cross arm; 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, and 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 a portion of the outer circumference of the core rod.

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

4. The composite cross arm according to claim 3, characterized in that: The electric 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 connector is used to connect the electric 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 one end of the two second plates not connected to the first plate is vertically connected to the first sleeve; the second plate is provided with a first connecting hole for connecting the electric pole.

6. The composite cross arm according to claim 3, characterized in that: A tension connection portion is provided on a side of the first sleeve away from the pole, and a second connection hole is provided on the tension connection portion for connecting the tension 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 portion of the mandrel, the second connecting piece is connected to the bottom side of the second sleeve, and 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 mandrel, the third connecting piece is connected to the top end of the end sleeve, and the third connecting piece is provided with a fourth connecting hole for connecting the first connecting assembly.

10. The composite cross arm according to claim 1, characterized in that: The composite cross arm also includes an insulating protective cover, which is used to cover 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 two first wire clamps connected at both ends of the first connecting component on both sides of the pole. A side phase jumper is led out from the first wire clamp connected to one end of the first connecting component and extends from under 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 a composite cross arm as claimed in any one of claims 1 to 14, wherein the composite cross arm is fixed on the electric pole.

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