Composite cross arm

Abstract

The utility model discloses a composite cross arm, which comprises a first cross arm, the first cross arm comprises a core rod, a connecting fitting, a middle fitting, two end fittings and an insulating layer, the connecting fitting is connected to the first middle part of the core rod and is used for connecting a tension member and an electric pole, and the tension member is used for hanging a middle-phase wire; the two end hardware fittings are connected to the two ends of the core rod respectively and used for being connected with the first connecting assembly so as to be connected with the side-phase wire and the side-phase jumper wire in a hanging mode. The middle fitting is connected to the second middle part of the core rod and is used for connecting the second connecting assembly so as to hang a middle-phase jumper wire; the insulating layer covers at least part of the outer peripheral surface of the core rod. According to the composite cross arm, the full-insulation horizontal structure is adopted, the second connecting assembly is connected through the middle fitting so that the fixed middle-phase jumper wire can be hung below the cross arm, accidents such as tripping caused by electric shock birds can be effectively prevented, safety is higher, and operation and maintenance cost is lower.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of overhead transmission lines, in particular to a composite cross arm. BACKGROUND

[0002] The cross arm is a component installed on the electric pole in the overhead line, which mainly supports the conductor. The traditional transmission pole adopts iron cross arm, and the conductor is hung by installing insulators on the iron cross arm. When the conductor adopts bare conductor, birds taking off or landing from the transmission pole may simultaneously contact any two conductors or any one conductor and the iron cross arm to form a closed circuit to cause electric shock, which will directly affect the normal operation of the power infrastructure, cause tripping accidents, and also cause bird death and reduce biodiversity. At the same time, the tension iron cross arm usually adopts to raise the middle part of the cross arm to perform the middle phase jumper to ensure the insulation distance between the middle phase jumper and other live structures, but it usually adopts the free jumper form, and the free jumper will be seriously wind deflected when subjected to large wind load, which is difficult to ensure sufficient insulation distance and is easy to cause electric shock of birds and cause power accidents.

[0003] At present, the bare conductor outside the electric pole is usually installed with an insulating sheath to protect birds from electric shock, but this protection method is expensive, and the long-term use effect is not good, and needs to be regularly replaced and maintained, which has high operation and maintenance cost. CONTENT OF THE UTILITY MODEL

[0004] In view of the deficiencies of the prior art, the purpose of the present application is to provide a composite cross arm, which adopts a full-insulation horizontal structure and connects the second connecting assembly through the intermediate fitting to hang the fixed middle phase jumper below the cross arm, which can effectively prevent tripping accidents caused by electric shock of birds, has higher safety and lower operation and maintenance cost.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present application is: a composite cross arm, comprising a first cross arm, the first cross arm comprising a core rod, a connecting fitting, an intermediate fitting, two end fittings, and an insulating layer, the connecting fitting is connected to the first middle part of the core rod and used to connect a tension member and an electric pole, the tension member is used to hang a middle phase conductor; the two end fittings are respectively connected to the two ends of the core rod and used to connect a first connecting assembly to hang a side phase conductor and a side phase jumper; the intermediate fitting is connected to the second middle part of the core rod and used to connect a second connecting assembly to hang a middle phase jumper; and the insulating layer covers at least part of the outer circumferential surface of the core rod.

[0006] The connecting fitting is a cross-shaped fitting, the connecting fitting comprises 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 connected with the first sleeve perpendicularly, and the pole connecting piece is used to connect the electric pole.

[0007] The electric pole connecting piece comprises two first connecting pieces, which are connected perpendicularly at the middle part of the first sleeve and are located at the two axial sides of the first sleeve respectively, and the first connecting pieces are used for connecting the electric pole.

[0008] 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, and the two second plate pieces extend away from the first plate piece in the same direction, and the ends of the two second plate pieces, which are not connected with the first plate piece, are connected perpendicularly with the first sleeve; the second plate piece is provided with a first connecting hole, which is used for connecting the electric pole.

[0009] The first sleeve is provided with a strain connecting part on the side away from the electric pole, and the strain connecting part is provided with a second connecting hole, which is used for connecting the strain member.

[0010] The strain connecting part is an L-shaped plate piece, which comprises a third plate piece and a fourth plate piece connected perpendicularly, the third plate piece is connected tightly along the vertical direction on the side surface of the first sleeve away from the electric pole, the fourth plate piece is arranged along the horizontal direction and extends away from the first sleeve, the end of the fourth plate piece, which is connected with the third plate piece, is connected with the first sleeve simultaneously, and the fourth plate piece is provided with the second connecting hole.

[0011] 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 on the bottom side of the second sleeve, the second connecting piece is provided with a third connecting hole, which is used for connecting the second connecting assembly.

[0012] The second connecting piece comprises two fifth plate pieces, the fifth plate pieces are connected on the bottom side of the second sleeve and extend away from the second sleeve along the horizontal direction, the two fifth plate pieces are arranged symmetrically along the axis of the second sleeve, and the fifth plate pieces are provided with the third connecting hole.

[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 on the top end of the end sleeve, the third connecting piece is provided with a fourth connecting hole, which is used for connecting the first connecting assembly.

[0014] The third connecting piece comprises two sixth plate pieces, the sixth plate pieces are connected on the top side of the end sleeve and extend away from the end sleeve along the horizontal direction, the two sixth plate pieces are arranged symmetrically along the axis of the end sleeve, and the sixth plate pieces are provided with the fourth connecting hole.

[0015] The beneficial effects of the present application are: different from the prior art, the composite cross arm of the present application adopts a whole insulating horizontal structure, can connect the second connecting assembly through the intermediate fitting to hang the fixed middle-phase jumper wire below, can avoid the wind deviation risk caused by the free jumper wire in the middle of the composite cross arm, ensures the insulation distance between the conductors of the high-voltage end on the power transmission pole and between the conductors and the top of the power pole of the low-voltage end, so that no matter where the birds take off, stand or land on the power transmission pole, no electric circuit is formed, effectively preventing accidents such as tripping caused by electric shock of birds, higher safety, lower operation and maintenance cost, while effectively reducing the probability of birds landing on the power transmission pole and being electrocuted to death, protecting biodiversity.

[0016] Meanwhile, the composite cross arm of the present application can be assembled into a double-horizontal cross arm structure by selecting different specifications of the first connecting assembly and the second connecting assembly, making the composite cross arm applicable to more specifications of power poles, more flexible installation, and stronger universality.

[0017] In addition, compared with the traditional iron cross arm, the composite cross arm of the present application can directly hang the side-phase conductor through the end fitting connecting the first connecting assembly, can cancel the insulator structure at both ends, makes the cross arm structure simpler, installation more convenient, and less prone to rust, longer service life. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic diagram of a power transmission pole 1000 of an embodiment of the present application;

[0019] Figure 2 is a structural schematic diagram of a first cross arm 100 of an embodiment of the present application;

[0020] Figure 3 is a structural schematic diagram of a connecting fitting 120 of an embodiment of the present application;

[0021] Figure 4 is a partial structural schematic diagram of a first cross arm 100 of an embodiment of the present application;

[0022] Figure 5 is a structural schematic diagram of an end fitting 140 of an embodiment of the present application;

[0023] Figure 6 is a partial structural schematic diagram of a power transmission pole 1000 of another embodiment of the present application. DETAILED DESCRIPTION

[0024] Upon request, specific embodiments of the present application will be disclosed herein. However, it should be understood that the embodiments disclosed herein are merely exemplary of the present application, which may be embodied in various forms. Therefore, the specific details disclosed herein are not to be construed as limiting, but merely as a basis for the claims and as a representative basis for teaching those skilled in the art to variously apply the present application in any appropriate manner in practice, including employing the various features disclosed herein in combination with features that may not be explicitly disclosed herein.

[0025] Unless otherwise expressly specified or limited, the term "connection" as used in this application should be understood in a broad sense, and may refer to direct connection or connection through an intermediate medium. In the description of this application, it should be understood that the orientations or positional relationships indicated by terms such as "upper," "lower," "end," and "one end" are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of this application and simplify the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0026] like Figure 1 As shown, the present application provides a transmission pole 1000, which is a tension pole. The tension pole includes a composite crossarm 10 and a pole 20, with the composite crossarm 10 being fixed to the pole 20. In a power system, a tension pole refers to a tower used to segment a circuit in the middle of a line to control the range of pole collapse and line breakage. The tension pole is equipped with tension components and tension clamps on the crossarm to hang the conductors.

[0027] The composite crossarm 10 includes two first crossarms 100, two first connecting assemblies 200, a second connecting assembly 300, and two tension members 400. The first middle portions of the two first crossarms 100 are fixed to the two sides of the pole 20, respectively. The length directions of the two first crossarms 100 are located in the same horizontal plane and are parallel to each other. The corresponding ends of the two first crossarms 100 are connected together by the first connecting assembly 200. The two ends of the first connecting assembly 200 are respectively used to connect to the two first wire clamps 11 to hang the edge phase conductor and the edge 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 end of the two tension members 400 is 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 in the same horizontal plane as the length direction of the first crossarm 100 and is perpendicular to each other.

[0028] The transmission pole 1000 of the present application utilizes a composite crossarm 10 for mounting conductors. The composite crossarm 10 utilizes a fully insulated horizontal structure, and a fixed mid-phase jumper is mounted below it via a second connecting assembly 300. This avoids the risk of wind deflection associated with a free jumper in the middle of the composite crossarm 10, ensuring insulation distances between the high-voltage conductors and between the conductors and the top of the pole 20 at the low-voltage end. This ensures that birds, regardless of their location on the transmission pole 1000, will not form an electrical circuit. This effectively prevents accidents such as tripping caused by electrocution, resulting in higher safety and lower maintenance costs. It also effectively reduces the chance of electrocution from birds landing on the transmission pole 1000, thereby protecting biodiversity. Conventional solutions utilize suspension insulators mounted on iron crossarms to mount conductors on tension poles. In the present application, the first connecting assembly 200 of the composite crossarm 10 is used to directly mount the side-phase conductors, eliminating the insulator structures at both ends. This simplifies the crossarm structure, simplifies installation, and reduces corrosion, resulting in a longer service life.

[0029] It should be noted that the first middle portion and the second middle portion in this application refer to the portion between the two ends, not strictly the center portion. The second middle portion of the first cross arm 100 is located between the first middle portion and the end portion of the first cross arm 100.

[0030] like Figure 2 As shown, the first cross arm 100 includes a core rod 110 (marked in the figure for schematic purposes only), a connecting hardware 120, an intermediate hardware 130, two end hardware 140, and an insulating layer 150. The connecting hardware 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 hardware 130 is connected to the second middle part of the core rod 110 for connecting the second connecting assembly 300; the two end hardware 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 part of the outer circumference of the core rod 110.

[0031] The core rod 110 is made of a 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.

[0032] like Figure 3 As shown, the connecting hardware 120 is a cross-shaped hardware, and the connecting hardware 120 includes a first sleeve 121 and a pole connector 122. The first sleeve 121 is sleeved on the first middle part of the core rod 110, that is, the first sleeve 121 is a hollow tube structure, sleeved on the outer periphery of 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 connector 122 is vertically connected to the first sleeve 121, and is used to fix the first cross arm 100 on the pole 20.

[0033] The electric pole connecting piece 122 comprises two first connecting pieces 123 which are vertically connected at the middle part of the first sleeve 121 and respectively located at the axial two sides of the first sleeve 121, and the first connecting piece 123 is used for connecting the electric pole 20.

[0034] The first connecting piece 123 comprises a first plate piece 1231 and two second plate pieces 1232 which are vertically connected, and the two second plate pieces 1232 extend away from the first plate piece 1231 in the same direction from the two ends of the first plate piece 1231, and the end of the two second plate pieces 1232 which is not connected with the first plate piece 1231 is vertically connected with the first sleeve 121. The two second plate pieces 1232 are respectively provided with a first connecting hole 12321 which is used for connecting the electric pole 20, and the two first connecting holes 12321 are coaxially arranged and the penetrating direction thereof is perpendicular to the plate surface of the second plate piece 1232. The electric pole 20 is provided with a first mounting hole (not shown in the figure) which is correspondingly matched with the first connecting hole 12321. By penetrating a fastener such as a bolt or a screw in the corresponding first connecting hole 12321 and the first mounting hole, the connecting fitting 120 can be matched and connected with the electric pole 20, that is, it is not necessary to punch holes on the first sleeve 121 and the core rod 110 for connection, so as to avoid the influence of the punching on the mechanical properties of the core rod 110, and further avoid the generation of the power safety hidden danger. In addition, the first connecting piece 123 is provided in a hollow structure, so that the connecting strength can be ensured while the weight of the connecting fitting 120 is reduced, and the cost is reduced.

[0035] The side of the first sleeve 121 away from the electric pole 20 is provided with a strain connecting part 124, and the strain connecting part 124 is provided with a second connecting hole 1241 which is used for connecting the strain member 400. The strain connecting part 124 can be arranged at the middle part of the first sleeve 121, so that the strain member 400 is more uniform after installation.

[0036] The strain connecting part 124 is an L-shaped plate member, including a third plate member 1242 and a fourth plate member 1243 connected vertically, the third plate member 1242 is connected to the side surface of the first sleeve 121 far away from the pole 20 in the vertical direction, the fourth plate member 1243 is arranged in the horizontal direction and extends away from the first sleeve 121, the end of the fourth plate member 1243 connected with the third plate member 1242 is connected with the first sleeve 121, the second connecting hole 1241 is arranged on the fourth plate member 1243, the through direction of the second connecting hole 1241 is perpendicular to the plate surface direction of the fourth plate member 1243, and the strain 400 is connected by a hanging ring or the like connecting member. The third plate member 1242 can strengthen the connection strength between the fourth plate member 1243 and the first sleeve 121, and further make the installation of the strain 400 more stable. Further, the thickness of the fourth plate member 1243 in the vertical direction is less than the height of the first sleeve 121 in the vertical direction, which can reduce the weight of the connecting fitting 120 while ensuring the connection strength of the strain 400, and reduce the cost.

[0037] As shown in Figure 4 The intermediate fitting 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, the second connecting member 132 is connected to the bottom side of the second sleeve 131, the third connecting hole 1321 is arranged on the second connecting member 132, and the second connecting assembly 300 is connected by a bolt, a screw rod or the like fastener, so that the second sleeve 131 and the core rod 110 are not punched for connection, avoiding the influence of punching on the mechanical properties of the core rod 110, and further avoiding the generation of power safety hidden danger.

[0038] The second connecting member 132 includes two fifth plate members 1322, the fifth plate member 1322 is connected to the bottom side of the second sleeve 131 and extends away from the second sleeve 131 in the horizontal direction, the two fifth plate members 1322 are symmetrically arranged along the axis of the second sleeve 131, that is, the two fifth plate members 1322 are arranged away from each other in the horizontal plane where the bottom surface of the second sleeve 131 is located, the third connecting hole 1321 is arranged on the fifth plate member 1322, and the through direction of the third connecting hole 1321 is perpendicular to the plate surface direction of the fifth plate member 1322. Further, the fifth plate member 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 member 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.

[0039] As shown in Figure 5As shown, the end fitting 140 includes an end sleeve 141 sleeved on the end of the core rod 110 and a third connecting piece 142 connected to the top end of the end sleeve 141, and the third connecting piece 142 is provided with a fourth connecting hole 1421 for connecting the first connecting assembly 200 through bolts, screws or other fasteners, i.e. without punching holes on the end sleeve 141 and the core rod 110 for connection, avoiding the influence of punching holes on the mechanical properties of the core rod 110, and further avoiding the generation of power safety hazards.

[0040] 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 is fixed on the end of the core rod 110 through a pressure bonding process.

[0041] The third connecting piece 142 includes 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 sixth plate piece 1422 is provided with the 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 piece 1422. Further, the third connecting piece 142 is located at the top side of one end of the end sleeve 141 not connected to the core rod 110, so as to reserve the pressure bonding 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, 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.

[0042] The insulation layer 150 includes a sheath, and the insulation layer 150 is located on the outer periphery of the core rod 110 except the connecting fitting 120, the intermediate fitting 130 and the end fitting 140, and the insulation layer 150 is connected to the connecting fitting 120, the insulation layer 150 is connected to the intermediate fitting 130, and the insulation layer 150 is connected to the end fitting 140, all in a sealed manner, which can effectively prevent external moisture from damaging the core rod 110, and further avoid affecting the service life of the first cross arm 100. Further, the insulation layer 150 further includes a shed arranged on the sheath, which can 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.

[0043] In an embodiment, the insulating 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 to integrally form the 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 flash and rain flash and improve the electrical safety of the first cross arm 100. In other embodiments, the insulating layer can also be formed through a molding process or pre-molding and then sleeved on the outer periphery of the core rod, which is not specifically limited here.

[0044] 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 increase the contact area between each sleeve and the core rod 110, thereby ensuring the connection strength between the connecting fittings 120, the intermediate fittings 130, the end fittings 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-sectional shape of the core rod, which is not limited here.

[0045] In an embodiment, the materials of the connecting fittings 120, the intermediate fittings 130, and the end fittings 140 can be metal (for example, iron, steel, aluminum, etc.), which is convenient to obtain and has low cost. In addition, the connecting fittings 120, the intermediate fittings 130, and the end fittings 140 are integrally formed into fitting assemblies and then connected together through welding, which is reliable and easy to manufacture. In other embodiments, each fitting can also be integrally formed through casting, as long as the connection strength between each assembly is ensured, which is not specifically limited here.

[0046] In combination with Figure 1 and 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.

[0047] 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.

[0048] 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, making the installation more flexible and more versatile.

[0049] Combine Figure 1 and Figure 3 As shown, one end of the two tension members 400 is connected to the two connecting hardware 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 components can be achieved by fasteners such as bolts and nuts.

[0050] In one embodiment, the tension member 400 may be a conventional tension composite insulator, the ball head hanger plate and the ball socket hanger plate are conventional connectors that match the hardware at both ends of the tension composite insulator, the first wire clamp 11 may be a conventional tension wire clamp, and the second wire clamp 12 may be a conventional suspension wire clamp. In other embodiments, the tension member may also be conventional tension hardware, etc., and the corresponding connectors may be replaced according to the installation requirements. The first wire clamp and the second wire clamp may also adopt other wire clamp structures, as long as they can achieve the corresponding wire hanging function, and there is no specific limitation here.

[0051] 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.

[0052] When a single-loop three-phase conductor is hung on the composite crossarm 10, the three-phase conductor includes two-phase side-phase conductors and one-phase middle-phase conductor. The two-phase side-phase conductors are respectively hung on the first wire clamps 11 at one end of the two first connecting components 200, and the two-phase side-phase jumpers are respectively led out, and then the two-phase side-phase jumpers are respectively hung on the first wire clamps 11 at the other end of the corresponding first connecting components 200, and the side-phase jumpers are electrically connected to the side-phase conductors on both sides of the first connecting components 200; the middle-phase conductor of the other phase is hung on the first wire clamp 11 of one of the tension members 400 and the middle-phase jumper is led out, and the middle-phase jumper is hung on the second wire clamp 12 in the middle of the second connecting component 300, and then the middle-phase jumper is hung on the first wire clamp 11 of another tension member 400 on the other side of the pole 20, and the middle-phase jumper is electrically connected to the middle-phase conductor on both sides of the pole 20.

[0053] 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 .

[0054] In another embodiment, Figure 1 As 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.

[0055] Further, the first cross arm 10 can be provided as a symmetrical structure, i.e. the connecting fitting 120 is located at the midpoint of the first cross arm 100, and the two intermediate fittings 130 are respectively located at the quarter point or the fifth point of the first cross arm 100, so that the composite cross arm 10 is more uniform in stress after installation, and the structure is more stable.

[0056] It can be understood that the overall length of the composite cross arm 10, the length of the first cross arm 100, the specifications of the first wire clamp 11 and the second wire clamp 12, etc. can be adjusted accordingly according to the needs; and the installation sequence of the composite cross arm 10 can also be adjusted accordingly according to the needs, i.e. the two first cross arms 100 can be fixed on the pole 20 first, then the strain member 400 is installed, and then the two first cross arms 100 are connected through the first connecting assembly 200 and the second connecting assembly 300, which is not specifically limited here.

[0057] Further, as shown in Figure 6 The composite cross arm 10 further comprises an insulating protective cover 500, the insulating protective cover 500 comprising a first protective cover 510 and a second protective cover 520, the first protective cover 510 being used for covering the metal structure on the top of the pole 20 and the upper side of the middle part of the composite cross arm 10, and the second protective cover 520 being used for covering the metal structure on the lower side of the middle part of the composite cross arm 10, the first protective cover 510 and the second protective cover 520 cooperating to cover the metal structure on the top of the pole 20 and the middle part of the composite cross arm 10, so as to enhance the insulation effect of the top of the pole 20, further avoid the formation of a power circuit when birds take off, stand or land on the top of the pole 20, and further reduce the probability of birds being electrocuted to death, and protect biodiversity.

[0058] The main structure of the insulating protective cover 500 is a rectangular parallelepiped structure with an open bottom, which is convenient for installation and covering of the insulating protective cover 500; and a plurality of cavities are provided on the insulating protective cover 500 for passing through part of the structure or fasteners such as bolts and nuts of the composite cross arm 10.

[0059] The main structure of the first protective cover 510 is a rectangular parallelepiped structure with an open bottom, and after the composite cross arm 10 is installed on the pole 20, the height of the rectangular parallelepiped 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 rectangular parallelepiped structure in the direction of the wire extension matches the distance between the sides of the two first sleeves 121 away from each other, and the length of the rectangular parallelepiped 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.

[0060] 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, so as to facilitate the penetration of fasteners and the installation of the composite cross arm 10 while ensuring the insulation effect.

[0061] 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 along 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 is matched with the size of the metal structure covered by the third protective cover 530 and the fourth protective cover 540.

[0062] The main body structure of the second protective cover 520 is a cuboid structure with the bottom and the upper part being open, the length and the width of the cuboid structure are the same as the main body structure of the first protective cover 510, and the height of the cuboid structure in the vertical direction is matched with 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, so as to facilitate the penetration of fasteners while ensuring the insulation effect.

[0063] Further, the second protective cover 520 can include two sub-protective covers 521, and the two sub-protective covers 521 are cuboid structures with three open sides, 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.

[0064] 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 is a pointed top structure, and the pointed end of the pointed top structure is arranged upward, so that 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, and further reduce the probability of bird electrocution death, and protect the biodiversity. The pointed top structure can be a circular cone or a pyramid structure, which is simple in structure and convenient to manufacture.

[0065] Further, the insulation protective cover 500 further comprises a fastener protective cover 550 for covering the fasteners such as nuts which need to be passed during the installation of the composite cross arm 10 and the electric pole 20, further improving the coverage of the metal structure at the top of the electric pole 20 and the middle of the composite cross arm 10, thereby further strengthening the insulation effect of the top of the electric pole 20.

[0066] The insulation protective cover 500 is made of silicone rubber which has excellent insulation performance and can ensure the insulation effect of the insulation protective cover 500, or the insulation protective cover 500 can also be made of other insulation materials, which is not limited herein.

[0067] In the embodiment, the insulation protective cover 500 is of a split structure, i.e. the first protective cover 510 and the two sub-protective covers 521 are respectively manufactured and installed, in other embodiments, the insulation protective cover can also be of a one-piece structure, as long as it can be installed and covered on the top of the electric pole to achieve the insulation function, which is not limited herein.

[0068] The technical content and technical features of the present application have been disclosed above, however, it can be understood that under the creative thought 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, 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: The cross arm comprises 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 and is used to connect the tension member and the pole. The tension member is used to hang the middle phase conductor. The two end hardware are respectively connected to the two ends of the core rod and are used to connect the first connecting assembly to hang the side phase conductor and the side phase jumper. The intermediate hardware is connected to the second middle part of the core rod and is used to connect the second connecting assembly to hang the middle phase jumper. The insulating layer covers at least a portion of the outer circumference of the core rod.

2. The composite cross arm according to claim 1, 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.

3. The composite cross arm according to claim 2, 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.

4. The composite cross arm according to claim 3, 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.

5. The composite cross arm according to claim 2, 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.

6. The composite cross arm according to claim 5, characterized in that: The tension-resistant connection part is an L-shaped plate, including a third plate and a fourth plate connected vertically. The third plate is tightly connected to the plate surface of the first sleeve on the side away from the pole in the vertical direction. The fourth plate is arranged in the horizontal direction and extends in the direction away from the first sleeve. The end of the fourth plate connected to the third plate is also connected to the first sleeve, and the second connection hole is provided on the fourth plate.

7. The composite cross arm according to claim 1, 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.

8. The composite cross arm according to claim 7, characterized in that: The second connecting member includes two fifth plates, which are connected to the bottom side of the second sleeve and extend horizontally in a direction away from the second sleeve. The two fifth plates are symmetrically arranged along the axis of the second sleeve, and the third connecting hole is provided on the fifth plate.

9. The composite cross arm according to claim 1, 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 9, characterized in that: The third connecting member includes two sixth plates, which are connected to the top side of the end sleeve and extend horizontally in a direction away from the end sleeve. The two sixth plates are symmetrically arranged along the axis of the end sleeve, and the fourth connecting hole is provided on the sixth plate.

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