Composite cross arm and power transmission tower

Abstract

Disclosed in the present application is a composite cross arm, comprising: a first cross arm, the first cross arm being an inverted V-shaped structure, and the top and two ends of the first cross arm being respectively used for hanging conductors; two second cross arms, one end of each of the two second cross arms being connected to a middle of the first cross arm, the other end of each second cross arm being used for connecting to a utility pole, each second cross arm being inclined in the length direction, and the second cross arms being arranged below the first cross arm and located in the same vertical plane as the first cross arm; and two connecting fittings, the other ends of the two second cross arms being respectively connected to two sides of the utility pole by means of the two connecting fittings. The composite cross arm of the present application uses a fully insulated structure and increases the overall hanging height of the conductors by means of the second cross arms, such that accidents such as tripping caused by bird electric shocks can be effectively avoided, thus achieving higher safety and lower operation and maintenance costs. Further disclosed in the present application is a power transmission tower.

Description

A composite crossarm and transmission pole Technical Field

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

[0002] A crossarm is a component installed on a pole in an overhead power line, and its main function is to support the conductors. Traditional transmission poles use iron crossarms, and the conductors are connected by insulators installed on the iron crossarms. When bare conductors are used, birds taking off or landing on the transmission pole may simultaneously come into contact with any two conductors or any conductor and the iron crossarm, forming a live circuit and causing electric shock. This will directly affect the normal operation of the power infrastructure, leading to accidents such as power outages, and will also cause bird deaths and reduce biodiversity.

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

[0004] To address the shortcomings of existing technologies, one of the objectives of this application is to provide a composite crossarm that employs a fully insulated structure and raises the overall hanging height of the conductor through a second crossarm, which can effectively prevent accidents such as tripping caused by electric shocks from birds, resulting in higher safety and lower maintenance costs.

[0005] To achieve the above objectives, the technical solution adopted in this application is: a composite crossarm, comprising: a first crossarm, the first crossarm having an inverted V-shaped structure, the top and both ends of the first crossarm being used for hanging conductors; two second crossarms, one end of each of the two second crossarms being connected to the middle of the first crossarm, the other end of the second crossarms being used for connecting to a utility pole, the second crossarms being inclined along their length direction, the second crossarms being located below the first crossarm and in the same vertical plane as the first crossarm; and two connecting fittings, the other ends of the two second crossarms being connected to both sides of the utility pole through the two connecting fittings.

[0006] In one embodiment, the first crossarm includes: two first core rods arranged at an included angle; two first intermediate fittings, which are respectively connected to the middle portions of the two second crossarms and the two first core rods; a second intermediate fitting, with one end of each of the two first core rods connected to both sides of the second intermediate fitting, which is used to hang wires; two end fittings, which are respectively connected to the other ends of the two first core rods, which are used to hang wires; and a first insulating layer covering at least a portion of the outer peripheral surface of the first core rods.

[0007] In one embodiment, the first intermediate fitting includes: a first intermediate sleeve, which is sleeved on the middle part of the first mandrel; and a first intermediate connecting part, which is disposed on the bottom surface of the first intermediate sleeve and is used to connect the second crossarm.

[0008] In one embodiment, the second intermediate fitting includes: a top connecting portion, on which a first hook portion is provided, the first hook portion being used to hang a wire via a wire clamp; and two second intermediate sleeves, which are respectively fitted onto one end of two first core rods, and the two second intermediate sleeves are respectively connected to the two ends of the top connecting portion.

[0009] In one embodiment, the top connecting part and the two second intermediate sleeves are an integral structure.

[0010] In one embodiment, the top connecting part and the second intermediate sleeve are detachably connected through the second intermediate connecting part, which is located at the end of the second intermediate sleeve that is not connected to the first core rod; the top connecting part includes two top connecting plates, which clamp and fix the two second intermediate connecting parts, and at least one top connecting plate is provided with a first hooking part.

[0011] In one embodiment, the end fitting includes a connected end sleeve and a second hook, the end sleeve being used to connect to the other end of the first core rod, and the second hook being used to hang the wire.

[0012] In one embodiment, the second attachment part includes an end plate and a wire hanging plate. The end plate covers the end of the end sleeve that is not connected to the first core rod. The wire hanging plate extends obliquely outward from the side of the end plate away from the end sleeve. The cross-sectional dimension of the end of the end sleeve connected to the end plate gradually decreases from the end of the first core rod toward the end plate.

[0013] In one embodiment, the second crossarm includes: a second core rod; a first fitting connecting one end of the second core rod to the middle of the first crossarm; a second fitting connecting the other end of the second core rod and a connecting fitting; and a second insulating layer covering at least a portion of the outer peripheral surface of the second core rod.

[0014] In one embodiment, the connecting fitting includes a pole connecting part and a crossarm connecting part connected together, the pole connecting part being connected to the pole, and the crossarm connecting part being connected to the other end of the second crossarm.

[0015] In one embodiment, the pole connecting part includes a first plate that is abutted and fixed on the pole; the crossarm connecting part includes two second plates that are perpendicularly connected to both ends of the first plate and extend in the same direction away from the ends of the first plate. The second plates are provided with fixing holes for fixing the connecting hardware to the second crossarm.

[0016] In one embodiment, the second plate is further provided with an adjustment hole. The fixing hole and the adjustment hole cooperate to make the angle between the second crossarm and the pole adjustable. The fixing hole is a circular through hole, and the adjustment hole is an arc-shaped hole. The arc of the adjustment hole is concentric with the fixing hole.

[0017] In one embodiment, the pole connection portion further includes a third plate for matching and connecting with the pole. The two ends of the third plate are respectively connected to the other ends of the two second plates that are not connected to the first plate. The length of the third plate along the length direction of the pole is less than the length of the second plates.

[0018] In one embodiment, the second intermediate fitting further includes two tension connecting parts, which are disposed on the top side of the top connecting part and symmetrically arranged along the vertical plane where the first crossarm is located. The tension connecting parts are used to connect the tension assembly.

[0019] In one embodiment, the composite crossarm further includes an insulating protective cover, which includes a connecting hardware protective cover and a pole protective cover. The connecting hardware protective cover is used to cover the connecting hardware, and the pole protective cover is used to cover the top of the pole.

[0020] The second objective of this application is to provide a power transmission pole, including a pole and the aforementioned composite crossarm, wherein the composite crossarm is fixed to the pole.

[0021] The beneficial effects of this application are as follows: Unlike the prior art, the composite crossarm of this application includes a first crossarm, two second crossarms, and connecting hardware. The composite crossarm as a whole adopts a fully insulated structure, and the second crossarms raise the hanging height of the conductor, extending the insulation distance between the conductor at the high-voltage end of the transmission pole and the top of the pole at the low-voltage end. This ensures that no matter where birds take off, stand, or land on the transmission pole, they will not form a power circuit, effectively preventing accidents such as tripping caused by electric shocks to birds. It is safer, has lower maintenance costs, and can effectively reduce the probability of birds landing on the transmission pole and being electrocuted, thus protecting biodiversity.

[0022] Meanwhile, this application connects the second crossarm and the pole with adjustable connecting hardware, which can adjust the angle between the second crossarm and the pole according to design requirements, making installation flexible and connection reliable; and the independent hardware structure makes it suitable for installing composite crossarms of different lengths, thus expanding its application range.

[0023] In addition, compared with traditional iron crossarms, the use of composite crossarms to directly connect conductors eliminates the need for suspension insulators, making the crossarm structure simpler, easier to install, less prone to corrosion, and with a longer service life. Furthermore, each insulation layer uses high-temperature vulcanized silicone rubber, which has good aging resistance and hydrophobic migration properties, reducing the probability of pollution flashover and rain flashover, and improving the electrical safety of the composite crossarm. Attached Figure Description

[0024] Figure 1 is a structural schematic diagram of a power transmission pole 1000 according to an embodiment of this application;

[0025] Figure 2 is a structural schematic diagram of the first crossbeam 100 according to an embodiment of this application;

[0026] Figure 3 is a partial enlarged schematic diagram of the structure of the first intermediate fitting 120 fixed on the first mandrel 110 according to an embodiment of this application.

[0027] Figure 4 is an enlarged view of point A in Figure 2;

[0028] Figure 5 is a schematic diagram of the hanging structure of the second intermediate fitting 130 according to an embodiment of this application;

[0029] Figure 6 is an enlarged view of point B in Figure 2;

[0030] Figure 7 is a partial structural schematic diagram of the first crossarm 100 according to an embodiment of this application;

[0031] Figure 8 is a schematic diagram of the hanging structure of the end fitting 140 according to an embodiment of this application;

[0032] Figure 9 is a structural schematic diagram of the end fitting 140 according to another embodiment of this application;

[0033] Figure 10 is a structural schematic diagram of the second crossbeam 200 according to an embodiment of this application;

[0034] Figure 11 is a structural schematic diagram of the connecting fitting 300 according to an embodiment of this application;

[0035] Figure 12 is a structural schematic diagram of the connecting hardware 300 according to another embodiment of this application;

[0036] Figure 13 is a structural schematic diagram of a power transmission pole 2000 according to another embodiment of this application;

[0037] Figure 14 is a partial structural schematic diagram of a power transmission pole 2000 according to another embodiment of this application;

[0038] Figure 15 is a structural schematic diagram of a power transmission pole 2000 according to another embodiment of this application;

[0039] Figure 16 is a partial structural schematic diagram of a power transmission pole 1000 according to another embodiment of this application. Detailed Implementation

[0040] As requested, specific embodiments of this application are disclosed herein. However, it should be understood that the embodiments disclosed herein are merely typical examples of this application and may be embodied in various forms. Therefore, the specific details disclosed herein are not intended to be limiting, but merely to serve as the basis for the claims and as a representative basis for teaching those skilled in the art to apply this application differently in practice in any appropriate manner, including employing the various features disclosed herein in combination with features that may not be explicitly disclosed herein.

[0041] The term "connection" as used in this application, unless otherwise explicitly specified or limited, should be interpreted broadly, encompassing both direct connection and connection via an intermediate medium. In the description of this application, it should be understood that the orientation or positional relationship indicated by terms such as "upper," "lower," "end," and "one end" is based on the orientation or positional relationship shown in the accompanying drawings and is used solely for the convenience of describing this application and for simplification, rather than indicating or implying that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0042] In one application scenario, as shown in Figure 1, this application provides a transmission pole 1000, which is a straight pole. The straight pole includes a composite crossarm 10 and a pole 20, with the composite crossarm 10 fixed to the pole 20. In power systems, a straight pole refers to a tower used to support conductors in a power line.

[0043] The composite crossarm 10 includes a first crossarm 100, two second crossarms 200, and two connecting fittings 300. The first crossarm 100 has an inverted V-shaped structure, and the top and both ends of the first crossarm 100 are used to hang wires. The two second crossarms 200 are respectively connected to the opposite sides of the pole 20 and form a V-shaped structure. One end of the two second crossarms 200 is respectively connected to the middle of the first crossarm 100, and the other end of the two second crossarms 200 is respectively connected to the two sides of the pole 20 through the two connecting fittings 300. The second crossarms 200 are inclined in the length direction and are located below the first crossarm 100 and in the same vertical plane as the first crossarm 100.

[0044] The transmission pole 1000 of this application uses a composite crossarm 10 to hang the conductor. The composite crossarm 10 adopts a fully insulated structure, and the second crossarm 200 raises the overall hanging height of the conductor, extending the insulation distance between the conductor at the high-voltage end of the transmission pole 1000 and the top of the pole 20 at the low-voltage end. This ensures that no matter where birds take off, stand, or land on the transmission pole 1000, no electrical circuit will be formed, effectively preventing accidents such as power outages caused by bird strikes. This results in higher safety, lower maintenance costs, and a significant reduction in the probability of birds being electrocuted on the transmission pole 1000, thus protecting biodiversity. In traditional solutions, straight poles use suspension insulators on iron crossarms to hang the conductor. Compared to traditional iron crossarms, this application uses a composite crossarm 10 to directly hang the conductor, eliminating the need for suspension insulators. This makes the crossarm structure simpler, easier to install, less prone to corrosion, and has a longer service life.

[0045] It should be noted that, unless otherwise specified, the "middle part" mentioned in this application refers to the area between the two ends, not strictly the center.

[0046] As shown in Figure 2, the first crossarm 100 includes two first core rods 110 (marked in the figure for illustrative purposes only), two first intermediate fittings 120, a second intermediate fitting 130, two end fittings 140, and a first insulating layer 150. The two first core rods 110 are arranged at an included angle. The two first intermediate fittings 120 are respectively connected to one end of the two second crossarms 200 and the middle of the two first core rods 110. One end of the two first core rods 110 is respectively connected to both sides of the second intermediate fitting 130, which is used to hang wires. The two end fittings 140 are respectively connected to the other end of the two first core rods 110, which is used to hang wires. The first insulating layer 150 covers at least a portion of the outer peripheral surface of the first core rods 110.

[0047] The two first core rods 110 are set at an angle, that is, both first core rods 110 are set downward, and the extended lines of the axes of the two first core rods 110 intersect, so that the first crossarm 100 can form an inverted V-shaped structure for hanging three-phase conductors.

[0048] As shown in Figures 3 and 4, the first intermediate fitting 120 includes a first intermediate sleeve 121 and a first intermediate connecting part 122. The first intermediate sleeve 121 is sleeved on the middle part of the first mandrel 110. Specifically, the first intermediate sleeve 121 is sleeved on the outer periphery of the first mandrel 110 and fixed on the first mandrel 110 by a pressing process. The side of the first intermediate sleeve 121 closest to the second crossarm 200 is defined as the bottom surface. The first intermediate connecting part 122 is disposed on the bottom surface of the first intermediate sleeve 121 and is used to connect the second crossarm 200.

[0049] The first intermediate sleeve 121 is a hollow tubular structure, and the shape and size of the cross-section of the first intermediate sleeve 121 match the cross-section of the first core rod 110 so that the first intermediate sleeve 121 can be sleeved and fixed on the outer periphery of the first core rod 110, and the contact area between the two can be increased to ensure the connection strength between the first intermediate sleeve 121 and the first core rod 110.

[0050] The first intermediate connecting part 122 is a plate-shaped structure, which is vertically connected to the bottom surface of the first intermediate sleeve 121 and is located in the middle of the first intermediate sleeve 121, so that the force is more even after the second crossarm 200 is installed. The first intermediate connecting part 122 is provided with a first connecting hole 1221, which is used to match and connect with the second crossarm 200 through fasteners such as bolts and screws. That is, there is no need to drill holes in the first intermediate sleeve 121 and the first core rod 110 for connection, avoiding the impact of drilling on the mechanical properties of the first core rod 110, and thus avoiding the generation of electrical safety hazards.

[0051] In one embodiment, as shown in FIG3, a first intermediate connecting part 122 may be provided. The plate surface direction of the first intermediate connecting part 122 is arranged along the axial direction of the first intermediate sleeve 121, and the through direction of the first connecting hole 1221 is perpendicular to the axial direction of the first intermediate sleeve 121. This makes it possible for the first intermediate hardware 120 to be fixed on the first mandrel 110, so that the plate surface direction of the first intermediate connecting part 122 and the length direction of the first crossarm 100 are located in the same vertical plane, which facilitates the assembly of the first crossarm 100 and the second crossarm 200.

[0052] In another embodiment, as shown in FIG4, two first intermediate connecting parts 122 may be provided. The two first intermediate connecting parts 122 are spaced apart on both sides of the bottom surface of the first intermediate sleeve 121. In this way, the two first intermediate connecting parts 122 can be matched and connected to the second crossarm 200 by clamping and fixing. Without affecting the mechanical properties of the first core rod 110, the connection strength between the first crossarm 100 and the second crossarm 200 is further improved.

[0053] The number and specific arrangement of the first intermediate connecting parts 122 can also take other forms, as long as they can be matched and connected with the second crossarm 200, and no specific restrictions are imposed here.

[0054] Referring to Figures 5-7, the second intermediate fitting 130 includes a top connecting portion 131 and two second intermediate sleeves 132 respectively connected to both ends of the top connecting portion 131. The top connecting portion 131 is provided with a first hook portion 1311, which is used to hang wires through wire clamps. The two second intermediate sleeves 132 are respectively sleeved on one end of the two first core rods 110. The second intermediate sleeve 132 is a tubular structure with one closed end connected to the top connecting portion 131, and the open end sleeved on one end of the first core rod 110. The shape and size of the cross-section of the second intermediate sleeve 132 match the cross-section of the first core rod 110.

[0055] In one embodiment, as shown in FIG5, the top connecting part 131 and the two second intermediate sleeves 132 are integrally formed. The top connecting part 131 is a plate-shaped structure, and the two second intermediate sleeves 132 are directly fixed on both sides of the top connecting part 131, and the axes of the two second intermediate sleeves 132 are set at an angle. Thus, when the first core rod 110 is pressed into the second intermediate sleeve 132, the two first core rods 110 can directly form an inverted V-shaped structure, which is simple to install and highly efficient. A first hook part 1311 is provided in the middle of the bottom side of the top connecting part 131.

[0056] The first mounting portion 1311 can be a hanging plate, which extends outward from the middle of the bottom side of the top connecting portion 131 along the plate surface direction of the top connecting portion 131. The hanging plate has hanging holes for mounting the suspension clamp 12 through components such as U-shaped hanging rings to hang the wire. When installing the wire, first fix the wire to the suspension clamp 12, then assemble the suspension clamp 12 with the U-shaped hanging ring, then clamp the U-shaped hanging ring on both sides of the hanging plate, aligning the mounting holes on the U-shaped hanging ring with the hanging holes, and then insert bolts, screws, or other fasteners to hang the suspension clamp 12 on the hanging holes, thereby securely hanging the wire on the second intermediate hardware 130. The width of the hanging plate along the wire extension direction is smaller than the width of the top connecting portion 131, which can reduce the weight of the top connecting portion 131 while ensuring the wire hanging effect and reducing costs.

[0057] Referring to Figure 5, the first mounting part 1311 can also be a mounting hole provided in the middle of the bottom side of the top connecting part 131. The suspension clamp 12 is directly hung in the mounting hole to hang the wire, which can further reduce the weight of the top connecting part 131 and reduce costs. The suspension clamp 12 adopts the clamp structure in the prior art, and no specific limitation is made here.

[0058] In another embodiment, as shown in Figures 6 and 7, to make the assembly of the first crossarm 100 more flexible, the top connecting part 131 and the second intermediate sleeve 132 are detachably connected by the second intermediate connecting part 133.

[0059] The second intermediate connecting part 133 is located at the end of the second intermediate sleeve 132 that is not connected to the first core rod 110. The second intermediate connecting part 133 is a plate structure, with its plate surface arranged along the axial direction of the second intermediate sleeve 132. The second intermediate connecting part 133 has a set of several second connecting holes 1331, the through direction of which is perpendicular to the plate surface direction of the second intermediate connecting part 133, for matching and connecting with the top connecting part 131. The width of the second intermediate connecting part 133 along the extension direction of the conductor is smaller than the width of the second intermediate sleeve 132, which can reduce the weight of the second intermediate hardware 130 and reduce costs while ensuring connection strength.

[0060] The top connecting portion 131 includes two top connecting plates 1312. The two top connecting plates 1312 clamp and fix the two second intermediate connecting portions 133, which can effectively ensure the connection strength between the two, thereby ensuring the overall mechanical strength of the first crossbeam 100. The two top connecting plates 1312 are provided with two sets of top connecting holes 13121. The two sets of top connecting holes 13121 are located on both sides of the top connecting plate 1312, and the through direction of the top connecting holes 13121 is perpendicular to the plate surface of the top connecting plate 1312. The number and position of each set of top connecting holes 13121 match the corresponding set of second connecting holes 1331. On each top connecting plate 1312, the centers of each set of top connecting holes 13121 are located on the same straight line, and the line connecting the centers of two sets of top connecting holes 13121 is set at an angle. Correspondingly, the centers of several second connecting holes 1331 are all located on the axis of the second intermediate sleeve 132. Thus, when the first mandrel 110 is installed in the second intermediate sleeve 132, and when the top connecting plate 1312 is matched and connected to the two second intermediate sleeves 132 through the two second intermediate connecting parts 133 respectively, the two first mandrels 110 can directly form an inverted V-shaped structure, making the installation operation simple and efficient. During installation, the two top connecting plates 1312 are clamped on both sides of the two second intermediate connecting parts 133, and the two sets of top connecting holes 13121 on each top connecting plate 1312 are matched and aligned with the several second connecting holes 1331 on the two second intermediate connecting parts 133 respectively. Bolts, screws and other fasteners are then inserted and tightened to connect the top connecting part 131 to the second intermediate sleeve 132. In other embodiments, the top connecting hole and the second connecting hole can also be configured in other ways, as long as they can be matched and connected so that the first crossarm as a whole has an inverted V-shaped structure. No specific restrictions are imposed here.

[0061] Furthermore, the top connecting plate 1312 is roughly triangular in shape, and two sets of top connecting holes 13121 are respectively set on the two sides of the top connecting plate 1312. This can save unnecessary material waste, further reduce the weight of the top connecting part 131, and reduce costs.

[0062] At least one top connecting plate 1312 is provided with a first hanging part 1311. The structure of the first hanging part 1311 is as described above and will not be repeated. In one embodiment, one first hanging part 1311 is provided. When the first hanging part 1311 adopts a hanging plate structure, a hanging plate can be directly extended from the middle of the bottom side of one of the top connecting plates 1312 to hang the suspension clamp 12. When the first hanging part 1311 adopts a hanging hole structure, a hanging hole can be directly provided in the middle of the bottom side of one of the top connecting plates 1312 to hang the suspension clamp 12, and a cavity is correspondingly provided on the other top connecting plate 1312 to avoid interference with the first hanging part 1311 for hanging wires. In another embodiment, two first hook parts 1311 are provided. Regardless of the structure of the first hook parts 1311, the first hook parts 1311 on the two top connecting plates 1312 are correspondingly provided. By cooperating with the two first hook parts 1311 to hang the suspension clamp 12, the connection strength between the two can be further improved, thereby improving the overall mechanical strength of the first crossarm 100.

[0063] Furthermore, the first crossarm 100 can adopt a symmetrical inverted V-shaped structure, that is, the two second intermediate sleeves 132 are symmetrically and obliquely arranged on both sides of the top connecting part 131. Thus, when the two first core rods 110 are respectively installed in the two second intermediate sleeves 132, the two first core rods 110 can be symmetrically and obliquely connected to both sides of the second intermediate hardware 130, so that the first crossarm 100 has a symmetrical structure as a whole. This makes the horizontal height of the wires hanging at both ends of the first crossarm 100 equal, and the distance from the wires hanging at the top of the first crossarm 100 along the vertical direction equal, so that the first crossarm 100 is subjected to more balanced force and the structure is more stable.

[0064] The included angle of the V-shaped opening of the first crossarm 100 can be specifically designed according to the insulation requirements of the composite crossarm 10 in different application scenarios. It can be achieved by adjusting the connection angle between the top connecting part 131 and the two second intermediate sleeves 132. This can be achieved by replacing different second intermediate fittings 130 or by setting multiple sets of top connecting holes 13121 with different angles on the top connecting plate 1312. No specific restrictions are imposed here.

[0065] As shown in Figures 2 and 7-9, the end fitting 140 includes a connected end sleeve 141 and a second hook part 142. The end sleeve 141 is used to connect the other end of the first core rod 110, and the second hook part 142 is used to directly hang the wire or to hang the wire through a wire clamp.

[0066] In one embodiment, as shown in FIG8, the end fitting 140 is a pressure cap type fitting that can directly hang wires. The end fitting 140 includes a connected end sleeve 141 and a second hook part 142. The end sleeve 141 is sleeved on the outer periphery of the end of the first core rod 110. The end sleeve 141 is a tubular structure closed at one end, and the shape and size of the cross-section of the end sleeve 141 match the cross-section of the first core rod 110. The second hook part 142 includes a base 1421, a pressure cap 1422, and two lugs 1423. The end of the cap sleeve 141 of the base 1421 is not connected to the first core rod 110. The base 1421 has a first groove 14211, which is an arc-shaped groove for placing wires. The base 1421 has two mounting holes, which are located on both sides of the first groove 14211, for matching and connecting with the pressure cap 1422. The bottom of the pressure cap 1422 has a second groove 14221, which is also an arc-shaped groove for assisting in fixing the wires. The first groove 14211 and the second groove 1422... The orientation of the first core rod 110 is perpendicular to its axis, and the two work together to securely hang the wire. Two lugs 1423 are respectively connected to both sides of the pressure cap 1422, and the two lugs 1423 are located on both sides of the axis of the second groove 14221. The lugs 1423 are provided with mounting holes, and the mounting holes on the two lugs 1423 correspond to the mounting holes on the base 1421, so that the lugs 1423 can be fastened to the base 1421 by bolts, screws or other fasteners, thereby enabling the pressure cap 1422 to press and fix the wire. When installing the wire, the wire is placed in the first groove 14211, the pressure cap 1422 is placed above the wire, so that the second groove 14221 is in contact with the top of the wire and presses the wire. Then, the fasteners are passed through the mounting holes on the lugs 1423 and the base 1421 and tightened to fix the pressure cap 1422 and the base 1421, thereby securing the wire to the end hardware 140.

[0067] Furthermore, the bottom of the second connecting part 142 is provided with a lifting part 143, and the lifting part 143 is provided with a lifting hole 1431 to meet the lifting requirements, that is, to use ropes and other tools to lift and install the first crossarm 100. The width of the lifting part 143 along the extension direction of the conductor is smaller than the width of the end sleeve 141, which can reduce the weight of the end hardware 140 and reduce costs while ensuring the hanging effect.

[0068] In another embodiment, as shown in FIG9, the end fitting 140 is a slotted wire clamp fitting, which can hang wires through the support wire clamp 11. The end fitting 140 includes a connected end sleeve 141 and a second hanging part 142. The structure of the end sleeve 141 is as described above and will not be repeated here. The second hanging part 142 is a slotted structure, which covers the end of the end sleeve 141 that is not connected to the first core rod 110. The slotted structure is a U-shaped slot with the slot opening facing upward. The two side walls of the U-shaped slot are provided with corresponding mounting holes for mounting the support wire clamp 11 through fasteners such as bolts and screws to hang wires. The support clamp 11 includes a clamp base and a clamp cover. The clamp base has an arc-shaped groove for placing the wire, and the bottom of the clamp cover has a corresponding arc-shaped groove for assisting in fixing the wire. Mounting holes are provided on both sides of the arc-shaped grooves on the clamp base and clamp cover for pressing and fixing the wire between the clamp base and clamp cover using bolts, screws, or other fasteners. Mounting holes are also provided at both ends of the clamp base for fixed connection with the side walls of the U-shaped groove. When installing the wire, first fix the wire to the support clamp 11 by placing the wire in the arc-shaped groove of the clamp base and pressing the clamp cover firmly onto the clamp base. Then, place the support clamp 11 into the groove structure of the end fitting 140, aligning the mounting holes at both ends of the clamp base with the mounting holes on the side walls of the U-shaped groove, and then insert fasteners to fix the support clamp 11 in the groove structure, thereby securely hanging the wire on the end fitting 140. The bottom of the second mounting part 142 is provided with a lifting part 143. The structure and purpose of the lifting part 143 are as described above and will not be repeated here. The support clamp 11 adopts the clamp structure in the prior art, and no specific limitation is made here.

[0069] In another embodiment, as shown in Figures 2 and 7, the end fitting 140 is a plate-type wire clamp fitting, which can hang wires through the suspension wire clamp 12. The end fitting 140 includes a connected end sleeve 141 and a second hooking part 142. The structure of the end sleeve 141 is as described above and will not be repeated here. The second hooking part 142 is a plate structure, which includes a vertically connected end plate and a hanging plate. The end plate covers the end of the end sleeve 141 that is not connected to the first core rod 110. The hanging plate extends vertically outward from the side of the end plate away from the end sleeve 141. The hanging plate is provided with mounting holes for mounting the suspension wire clamp 12 through components such as U-shaped hanging rings to hang wires. When installing the conductor, first fix the conductor to the suspension clamp 12, then assemble the suspension clamp 12 with the U-shaped hanging ring. Next, clamp the U-shaped hanging ring onto both sides of the hanging plate of the end fitting 140, aligning the mounting holes on the U-shaped hanging ring with the mounting holes on the hanging plate. Then, insert bolts, screws, or other fasteners to hang the suspension clamp 12 on the hanging plate, thus securely hanging the conductor on the end fitting 140. The width of the hanging plate along the conductor's extension direction is smaller than the width of the end sleeve 141, which reduces the weight of the end fitting 140 and lowers costs while ensuring effective conductor hanging. The suspension clamp 12 adopts a clamp structure from existing technology, and no specific limitations are specified here.

[0070] In other embodiments, the end fittings can also use existing fitting structures, as long as they can be used to hang wires, and no specific restrictions are imposed here.

[0071] As shown in Figures 1 and 10, the second crossarm 200 includes a second core rod 210 (marked in the figure for illustrative purposes only), a first fitting 220, a second fitting 230, and a second insulating layer 240. The first fitting 220 connects one end of the second core rod 210 to the middle part of the first crossarm 100; the second fitting 230 connects the other end of the second core rod 210 to the connecting fitting 300; and the second insulating layer 240 covers at least a portion of the outer peripheral surface of the second core rod 210.

[0072] The first fitting 220 includes a connected first sleeve 221 and a first connecting portion 222. One end of the first sleeve 221 is connected to one end of the second core rod 210. For example, the first sleeve 221 can be connected to the second core rod 210 through a crimping process. The first connecting portion 222 is used to connect the middle part of the first cross arm 100. The first connecting portion 222 is of a plate-like structure, and a third connecting hole 2221 is provided on the first connecting portion 222 for mating connection with the first connecting hole 1221 on the first intermediate connecting portion 122 to achieve the assembly of the first cross arm 100 and the second cross arm 200. During installation, the first connecting portion 222 and the first intermediate connecting portion 122 are arranged closely, and after aligning the third connecting hole 2221 with the first connecting hole 1221, fasteners such as bolts and screws are inserted and tightened to connect the first connecting portion 222 with the first intermediate connecting portion 122, thereby connecting one end of the second cross arm 200 to the middle part of the first cross arm 100.

[0073] The second fitting 230 includes a connected second sleeve 231 and a second connecting portion 232. One end of the second sleeve 231 is connected to the other end of the second core rod 210. For example, the second sleeve 231 can be connected to the second core rod 210 through a crimping process. The second connecting portion 232 is used to connect with the connecting fitting 300, and further connect the second cross arm 200 and the electric pole 20. The second connecting portion 232 includes a first connecting plate 2321 and two second connecting plates 2322. The first connecting plate 2321 covers the end of the second sleeve 231 that is not connected to the second core rod 210. The two second connecting plates 2322 are respectively vertically connected to both ends of the first connecting plate 2321, and the two second connecting plates 2322 extend in the same direction away from the second sleeve 231 from both ends of the first connecting plate 2321, making the second connecting portion 232 in a "C" - shaped structure. Two groups of fourth connecting holes 23221 are provided on each second connecting plate 2322, and the fourth connecting holes 23221 on the two second connecting plates 2322 are correspondingly arranged for mating connection with the connecting fitting 300 through fasteners such as bolts and screws, that is, there is no need to drill holes on the second sleeve 231 and the second core rod 210 for connection, avoiding drilling holes from affecting the mechanical properties of the second core rod 210, and further avoiding potential electrical safety hazards.

[0074] As shown in FIGS. 1, 10 - 12, the connecting fitting 300 is an adjustable fitting. The connecting fitting 300 includes a connected pole connecting portion 310 and a cross - arm connecting portion 320. The pole connecting portion 310 is connected to the electric pole 20, and the cross - arm connecting portion 320 is connected to the other end of the second cross arm 200, and the angle between the second cross arm 200 and the electric pole 20 is adjustable.

[0075] In one embodiment, the pole 20 has a square cross-section, and the pole connecting portion 310 is correspondingly configured as a plate structure, which increases the contact area between the pole connecting portion 310 and the pole 20, ensuring a reliable connection between the two. The pole connecting portion 310 includes a first plate 311, on which a first pole connecting hole 3111 is provided for fixing the first plate 311 to the pole 20 by fasteners such as bolts and screws.

[0076] The crossarm connecting part 320 includes two second plates 321, which are generally rectangular in shape. One end of each second plate 321 is perpendicularly connected to both ends of the first plate 311. The two second plates 321 extend in the same direction from both ends of the first plate 311 away from the first plate 311. The distance between the close surfaces of the two second plates 321 is slightly greater than the distance between the far surfaces of the two second connecting plates 2322 of the second connecting part 232 of the second fitting 230. This allows the second connecting part 232 to move between the two second plates 321, facilitating the adjustment of the angle between the second crossarm 200 and the pole 20. It also allows the two second plates 321 to be clamped and fixed to the two second connecting plates 2322 by fasteners such as bolts and screws, ensuring a reliable connection between the second crossarm 200 and the pole 20. The second plate 321 is provided with a fixing hole 3211 and an adjusting hole 3212. The fixing hole 3211 is a circular through hole, and the adjusting hole 3212 is an arc-shaped hole. The arc of the adjusting hole 3212 is concentric with the fixing hole 3211. The two work together to enable the second crossarm 200 to rotate around the fixing hole 3211, so as to adjust the angle between the second crossarm 200 and the pole 20 and fix the second crossarm 200 to the connecting hardware 300. The fixing holes 3211 and adjusting holes 3212 on each second plate 321 are respectively set to correspond to the two sets of fourth connecting holes 23221 on each second connecting plate 2322, so as to adjust the angle between the second crossarm 200 and the pole 20 and fix the second crossarm 200 to the connecting hardware 300. Thus, the angle between the second crossarm 200 and the pole 20 can be adjusted according to the design requirements, which is flexible in installation and reliable in connection. Moreover, the independent hardware structure makes it suitable for installing composite crossarms 10 of different lengths and specifications, thus expanding its application range.

[0077] In one embodiment, as shown in FIG11, the length of the first plate 311 along the length direction of the pole 20 is less than the length of the second plate 321 on the side near the pole 20, and the first plate 311 is connected to the upper part of the second plate 321. The fixing hole 3211 and the adjusting hole 3212 are located in the middle of the second plate 321, that is, the fixing hole 3211 and the adjusting hole 3212 are located below the first pole connecting hole 3111. This can prevent the fasteners between the pole connecting part 310 and the pole 20 from affecting the rotation adjustment of the angle between the second crossarm 200 and the pole 20, and at the same time reduce the amount of material used in the connecting hardware 300, thereby reducing manufacturing costs.

[0078] When installing the connecting hardware 300, firstly, the first plate 311 of the pole connecting part 310 is placed tightly against the pole 20, and the first pole connecting hole 3111 on the first plate 311 is aligned with the mounting hole on the pole 20. Then, bolts, screws and other fasteners are inserted and tightened to fix the connecting hardware 300 on the pole 20. When installing the second crossarm 200, the second connecting part 232 is placed between the two second plates 321, and the fixing hole 3211, the adjusting hole 3212, and the two sets of fourth connecting holes 23221 of the second connecting part 232 are aligned. Bolts, screws, and other fasteners are inserted into the corresponding fixing hole 3211 and fourth connecting hole 23221, adjusting hole 3212 and fourth connecting hole 23221 for pre-fixation. That is, the approximate position of the two is limited without affecting the rotation of the second connecting part 232 in the crossarm connecting part 320. At this time, the second crossarm 200 can rotate with the fixing hole 3211 as the center. That is, when the second crossarm 200 rotates, the fastener in the fixing hole 3211 remains in a fixed position, and the fastener in the adjusting hole 3212 slides and adjusts with the fixing hole 3211 as the center in the adjusting hole 3212. After adjusting the angle between the second crossarm 200 and the pole 20 to the preset angle, the above fasteners are tightened to fix the second crossarm 200 and the pole 20. In other embodiments, after the connecting hardware is fixed to the pole, fasteners can be pre-fixed by simply passing them through the corresponding fixing holes and the fourth connecting hole. After the second crossarm is adjusted to the correct position, the fasteners are then tightened, and fasteners are passed through the corresponding adjusting holes and the fourth connecting hole and tightened to fix the second crossarm to the pole. No specific limitations are imposed here.

[0079] Furthermore, to make the connection between the connecting hardware 300 and the pole 20 more secure, the pole connecting part 310 also includes a third plate 312. The two ends of the third plate 312 are respectively connected to the other ends of the two second plates 321 that are not connected to the first plate 311, so that the first plate 311 and the third plate 312 are located on both sides of the second plate 321, and the length of the third plate 312 along the length direction of the pole 20 is less than the length of the second plate 321. The third plate 312 is connected to the lower part of the second plate 321. The third plate 312 is provided with a second pole connecting hole 3121 for further fixing the connecting hardware 300 to the pole 20 with fasteners such as bolts and screws. The third plate 312 serves two purposes: firstly, it allows the upper and lower ends of the connecting hardware 300 to be fastened to the pole 20 simultaneously through the first plate 311 and the third plate 312, resulting in more even force distribution and a more reliable connection; secondly, by placing the third plate 312 at the end of the second plate 321 away from the pole 20, interference between the third plate 312 and the fasteners on the second plate 321 can be avoided during installation.

[0080] In another embodiment, the length of the first plate 311 along the length of the pole 20 is equal to the length of the second plate 321 on the side closest to the pole 20. This increases the contact area between the pole connection 310 and the pole 20, making the connection more reliable. Furthermore, the second plate 321 can also be approximately a right-angled trapezoid, with its lower edge horizontal and its upper edge sloping downwards from the upper end of the first plate 311 toward the upper end of the third plate 312. This reduces material usage and manufacturing costs while ensuring the connection strength of the connecting hardware 300. The specific shape of the upper edge of the second plate 321 can be adjusted according to the positions of the fixing hole 3211 and the adjusting hole 3212, as long as it does not affect the installation of the second crossarm 200; no specific limitations are imposed here.

[0081] When the length of the first plate 311 is less than the length of the second plate 321 on the side near the pole 20 and the first plate 311 is located above the second plate 321, the lower part of the connecting hardware 300 near the pole 20 has a hollow structure. During installation, the connecting hardware 300 is first connected to the pole 20 through the first plate 311. Then, the second crossarm 200 is installed and adjusted into place. Finally, bolts, screws and other fasteners are inserted into the second pole connection hole 3121 on the third plate 312 and the mounting hole on the pole 20 and tightened to further fix the connecting hardware 300 to the pole 20. When the length of the first plate 311 is equal to the length of the second plate 321 on the side closer to the pole 20, the lower part of the first plate 311 is provided with a third pole connection hole (not shown in the figure) corresponding to the second pole connection hole 3121. During installation, the third plate 312 can be connected to the pole 20 by passing bolts, screws and other fasteners through the second pole connection hole 3121, the third pole connection hole and the mounting hole on the pole 20. Other steps are as described above.

[0082] Furthermore, as shown in Figure 12, when the length of the first plate 311 is equal to the length of the second plate 321 on the side closest to the pole 20, to make the connection strength between the connecting hardware 300 and the pole 20 more reliable, the lower part of the first plate 311 is also provided with a fourth pole connection hole (not shown in the figure), and the fourth pole connection hole is located below the third pole connection hole. At this time, the third plate 312 is located in the middle of the second plate 321. During installation, the first plate 311 and the pole 20 can be further connected by inserting bolts, screws, or other fasteners through the fourth pole connection hole and the mounting hole on the pole 20. Other steps are as described above. In addition, the lower edge of the second plate 321 is inclined upward from the lower end of the first plate 311 toward the lower end of the third plate 312. This can reduce the amount of material used and lower the manufacturing cost while ensuring the connection strength of the connecting hardware 300. The specific shape of the lower edge of the second plate 321 can be adjusted according to the actual installation requirements, and no specific restrictions are imposed here.

[0083] In another embodiment, referring to Figure 12, the connecting fitting 300 is a fixed fitting, whose basic structure is similar to the aforementioned adjustable fitting. The difference is that the second plate 321 of the connecting fitting 300 does not have an adjustment hole 3212, but instead has two fixing holes 3211. The fixing holes 3211 on the second plate 321 correspond to the fourth connecting hole 23221 on the second connecting plate 2322. The connecting fitting 300 and the second crossarm 200 can be fixedly connected by fasteners such as bolts and screws, making the connection between the two more reliable. The relative position of the two fixing holes 3211 on the second plate 321 can be adjusted according to the installation requirements of the second crossarm 200, and no specific limitation is made here.

[0084] Further referring to Figure 11, both second plates 321 are provided with flanges 3213. The flanges 3213 extend vertically from the side of the second plate 321 near the pole 20 away from the first plate 311, and both flanges 3213 are located in the same plane as the first plate 311. The flanges 3213 can increase the contact area between the connecting hardware 300 and the pole 20, making the force between them more uniform and the connection more reliable.

[0085] Referring to Figures 1 to 12, in one embodiment, the first core rod 110 and the second core rod 210 are both made of composite materials, such as glass fiber or aramid fiber impregnated with epoxy resin and then pultruded. Compared with the metal materials of traditional crossarms, composite materials are more corrosion resistant, have lower cost, and can achieve a significant weight reduction, making the composite crossarm 10 easier to install.

[0086] In one embodiment, the first core rod 110 has a square cross-section, and the second core rod 210 has a circular cross-section. This arrangement results in a composite crossarm 10 with good overall structural strength, simple structure, and low cost. In other embodiments, the cross-sections of the first and second core rods can also be triangular, T-shaped, L-shaped, etc., as long as the structure of each core rod meets the strength requirements. The core rods can have different or the same structure. For example, the first core rod has a triangular cross-section, the second core rod has a square cross-section, or all core rods have square or circular cross-sections, etc., and no specific limitations are imposed here.

[0087] In one embodiment, the shape and size of the cross-section of the fitting sleeve on each mandrel are matched with the cross-section of the corresponding mandrel. That is, the shape and size of the cross-section of the first intermediate sleeve 121, the second intermediate sleeve 132 and the end sleeve 141 are matched with the cross-section of the first mandrel 110, and the shape and size of the cross-section of the first sleeve 221 and the second sleeve 231 are matched with the cross-section of the second mandrel 210, so as to fix each sleeve on the corresponding mandrel and increase the contact area between each sleeve and the corresponding mandrel, thereby ensuring the connection strength between each fitting and the corresponding mandrel.

[0088] In one embodiment, each fitting is made into a separate fitting component and then connected together by welding. The connection is reliable and the manufacturing is simple. 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. No specific restrictions are imposed here.

[0089] In one embodiment, both the first insulating layer 150 and the second insulating layer 240 include a sheath. The sheath of the first insulating layer 150 is sealed to the first intermediate fitting 120 and the second intermediate fitting 130 in the middle of the first core rod 110 and the end fittings 140 at both ends. The sheath of the second insulating layer 240 is sealed to the first fittings 220 and the second fittings 230 at both ends of the second core rod 210. This can effectively prevent external moisture from intruding and damaging the first core rod 110 and the second core rod 210, and avoid affecting the service life of the composite crossarm 10.

[0090] Furthermore, the first insulation layer 150 and the second insulation layer 240 may also include umbrella skirts spaced apart on the sheath. The umbrella skirts can increase the creepage distance on the outer surfaces of the first crossarm 100 and the second crossarm 200, thereby giving the composite crossarm 10 sufficient arc distance. In addition, the umbrella skirts can also prevent birds from nesting and improve the overall electrical safety of the composite crossarm 10.

[0091] In one embodiment, both the first insulating layer 150 and the second insulating layer 240 are high-temperature vulcanized silicone rubber. The silicone rubber material is encapsulated around the outer periphery of the first mandrel 110 and the second mandrel 210 using an integral vacuum injection molding process to form a high-temperature vulcanized silicone rubber insulating layer. High-temperature vulcanized silicone rubber has good aging resistance and hydrophobic migration properties, which can reduce the probability of pollution flashover and rain flashover, and improve the electrical safety of the composite crossarm 10. In other embodiments, the first insulating layer and the second insulating layer can also be formed by molding or pre-molded and then fitted onto the outer periphery of the corresponding mandrel; no specific limitations are imposed here.

[0092] The overall length of the composite crossarm 10, the length of the first crossarm 100 and the second crossarm 200, the specifications of the support clamp 11 and the suspension clamp 12, etc., can all be adjusted according to the requirements. The installation sequence of the composite crossarm 10 can also be adjusted according to the requirements. That is, the two second crossarms 200 can be fixed to the pole 20 first through the connecting hardware 300, and then the first crossarm 100 can be fixed. Alternatively, the first crossarm 100, the two second crossarms 200 and the connecting hardware 300 can be assembled first, and then installed on the pole 20 for adjustment and fixation. No specific restrictions are made here.

[0093] In another application scenario, as shown in Figures 13-15, this application also provides a transmission pole 2000, which is a tension pole. The tension pole includes a composite crossarm 30 and a pole 40, with the composite crossarm 30 fixed to the pole 40. In power systems, tension poles refer to towers used to segment lines to control the range of pole collapse and line breakage. Tension poles are used to hang conductors by setting tension components and tension clamps on the crossarm.

[0094] The composite crossarm 30 includes a first crossarm 400, two second crossarms 200, two connecting fittings 300, and two tension components 500. The structure of the composite crossarm 30 is basically similar to that of the composite crossarm 10. The difference is that the two ends of the first crossarm 400 are used to connect to the tension clamps 13 to hang the conductor; one end of each of the two tension components 500 is connected to the top two sides of the first crossarm 400, and the other end of the tension component 500 is used to connect to the tension clamps 13 to hang the conductor. The length direction of the tension component 500 is perpendicular to the vertical plane where the first crossarm 400 is located.

[0095] The second intermediate fitting 430 of the first crossarm 400 also includes two tension connecting parts 434. The two tension connecting parts 434 are disposed on the top side of the top connecting part 431 and are symmetrically arranged along the vertical plane where the first crossarm 400 is located. The tension connecting parts 434 are used to connect the tension assembly 500.

[0096] In one embodiment, as shown in FIG13, the tension connection part 434 is a plate-shaped structure, and the tension connection part 434 is provided with a tension connection hole for connecting the tension assembly 500 through a connecting component such as a hanging ring. In this case, the tension assembly 500 can be a tension insulator.

[0097] In another embodiment, as shown in Figure 14, when the top connecting part 431 includes two top connecting plates, the tension connecting part 434 can also be a tension connecting hole provided on the top side of the top connecting plate, used to connect the tension assembly 500 through fasteners such as bolts and nuts. In this case, the tension assembly 500 can be a tension fitting. The tension fitting has an overall L-shaped structure, including a first connecting plate 510 and a second connecting plate 520 that are vertically connected. The first connecting plate 510 is used to match and connect with the top connecting part 431, and the second connecting plate 520 is used to connect the tension clamp 13 through connecting components such as hanging rings. The tension fitting also includes a reinforcing rib 530, which is vertically connected to both the first connecting plate 510 and the second connecting plate 520, which can further improve the mechanical strength of the tension fitting.

[0098] The first attachment part of the second intermediate fitting 430 is connected to a suspension clamp 12 for hanging jumpers. The jumper is led out from the tension clamp 13 from the conductor attached to one of the tension components 500. The jumper is first attached to the suspension clamp 12 and then to the tension clamp 13 on the other tension component 500 on the other side of the pole 40. The jumper is electrically connected to the conductors on both sides of the pole 40.

[0099] In one embodiment, as shown in FIG13, the end fitting 440 includes an end sleeve 441 and a second hooking part 442. The second hooking part 442 specifically hangs the conductor through the tension clamp 13. The second hooking part 442 is located on the side of the end sleeve 441 that is not connected to the first core rod 410. The second hooking part 442 has a plate-like structure and includes an end plate and a hanging plate 4421. The end plate covers the end of the end sleeve 441 that is not connected to the first core rod 410. The hanging plate 4421 extends vertically outward from the side of the end plate away from the end sleeve 441. The hanging plate 4421 is provided with a hooking hole for hanging the triangular connecting plate 443 through connecting components such as a U-shaped hanging ring. The bottom ends of the triangular connecting plate 443 are provided with two wire clamp connecting holes for connecting two tension clamps 13 respectively. The conductor is suspended by the tension clamp 13 attached to the triangular connecting plate 443. This ensures the tension jumper distance and thus the electrical safety of the composite crossarm 30. On the other hand, it provides a certain degree of rotatability. When longitudinal unbalanced tension occurs on both sides of the conductors of the composite crossarm 30, the triangular connecting plate 443 and the tension clamp 13 can deflect, causing changes in parameters such as the span of the conductors on both sides (the horizontal distance between the conductor suspension points of two adjacent transmission towers). When the deflection is in an appropriate position, the tension of the conductors on both sides reaches a new balance, releasing the unbalanced tension, reducing the stress on the composite crossarm 30, and extending its service life.

[0100] In another embodiment, as shown in FIG15, the hanging plate 4421 of the second hooking part 442 of the end fitting 440 extends outward at an angle from the side of the end plate away from the end sleeve 441. After the end fitting 440 is pressed into the end of the first core rod 410 and installed on the pole 40, the hanging plate 4421 is horizontally set. The hanging plate 4421 is provided with several hooking holes for connecting the rectangular connecting plate 444. The two ends of the rectangular connecting plate 444 are provided with two wire clamp connecting holes for connecting two tension clamps 13 respectively. The specific connection method is as described above and will not be repeated. The plate area of ​​the rectangular connecting plate 444 is smaller than that of the triangular connecting plate 443, which can save materials and reduce costs. Furthermore, the cross-sectional dimension of the end sleeve 441 connected to the end plate gradually decreases from the end of the first core rod 410 toward the end plate, so that the end sleeve 441 uses less material while firmly connecting the first core rod 410 and the end plate. Also, the two ends of the rectangular connecting plate 444 can adopt a trapezoidal or arc-shaped structure, so that the rectangular connecting plate 444 uses less material while meeting the requirements for opening the hanging hole, thus reducing costs.

[0101] The tension insulator can adopt the existing tension composite insulator structure, and the tension clamp 13 can adopt the existing clamp structure. The installation method of the tension insulator and the tension clamp 13 can also be achieved using existing technology, and no specific restrictions are made here.

[0102] Furthermore, the composite crossarm 10 on the straight pole and the composite crossarm 30 on the tension pole may also include an insulating protective cover 600. The following description uses the straight pole as an example, as shown in Figure 16. The insulating protective cover 600 includes a connecting hardware protective cover 610 and a pole protective cover 620. The connecting hardware protective cover 610 is used to cover the connecting hardware 300, and the pole protective cover 620 is used to cover the top of the pole 20. The connecting hardware protective cover 610 and the pole protective cover 620 work together to cover the metal structure at the top of the pole 20, strengthening the insulation effect at the top of the pole 20. This further prevents birds from forming an electrical circuit and electrocuting them when taking off, standing, or landing at the top of the pole 20, thereby reducing the probability of birds being electrocuted and protecting biodiversity. The specific structure is as described above and will not be repeated here.

[0103] Furthermore, the main structure of the insulating protective cover 600 is a cuboid structure with an open bottom, which facilitates the installation of the insulating protective cover 600; and the insulating protective cover 600 is provided with several cavities for inserting part of the structure of the second crossarm 200 or fasteners such as bolts and nuts.

[0104] The main structure of the connecting hardware protective cover 610 is a cuboid structure with an open bottom. The size of the cuboid matches the size of the connecting hardware 300, and the size of the bottom opening matches the size of the horizontal cross section of the connecting hardware 300, so that the connecting hardware protective cover 610 can completely cover the connecting hardware 300 from top to bottom, while saving material costs. The connecting hardware protective cover 610 is provided with several cavities. One cavity corresponds to the second crossarm 200, that is, it corresponds to the position where the second crossarm 200 extends from the connecting hardware 300. The remaining cavities correspond to the mounting holes of the composite crossarm 10, which ensures insulation while facilitating the insertion of fasteners and the installation of the composite crossarm 10.

[0105] The main structure of the pole protective cover 620 is a cuboid structure with an open bottom. The size of the cuboid matches the size of the top of the pole 20, and the size of the bottom opening matches the size of the horizontal cross section of the pole 20. This allows the pole protective cover 620 to cover the top of the pole 20 from top to bottom while saving material costs. The pole protective cover 620 has several cavities, which are respectively set to correspond to the mounting holes on the pole 20. This ensures insulation while facilitating the insertion of fasteners and the installation of the composite crossarm 10.

[0106] Furthermore, the side openings of the connecting hardware protective cover 610 and the pole protective cover 620 are provided on their respective sides that are close to each other. The size of the side openings matches the size of the vertical cross section with the largest area of ​​the connecting hardware 300, so that the first plate 311 can be installed tightly against the pole 20, ensuring the connection strength between the connecting hardware 300 and the pole 20, thereby ensuring the stable installation of the composite crossarm 10.

[0107] Furthermore, the tops of the connecting hardware protective cover 610 and the pole protective cover 620 are pointed structures with the pointed ends facing upwards. Thus, when the protective covers are installed, the pointed structures prevent birds from standing or perching on the tops of the pole 20 and the connecting hardware 300, further reducing the probability of birds being electrocuted and protecting biodiversity. The pointed structure can be conical or pyramidal, with a simple structure and easy manufacturing.

[0108] Furthermore, the insulating protective cover 600 also includes a fastener protective cover 630, which is used to cover the fasteners such as nuts that need to be installed during the installation of the connecting hardware 300 and the pole 20, thereby further improving the coverage of the metal structure at the top of the pole 20 and thus further enhancing the insulation effect at the top of the pole 20.

[0109] The insulating protective cover 600 is made of silicone rubber, which has excellent insulation properties and can ensure the insulation effect of the insulating protective cover 600. Alternatively, the insulating protective cover can also be made of other insulating materials, without specific restrictions.

[0110] In one embodiment, the insulating protective cover 600 has a split structure, meaning each protective cover is manufactured and installed separately. Further, the connecting hardware protective cover 610 and the pole protective cover 620 can be integrated as two sub-protective covers; that is, the two sub-protective covers are manufactured separately and installed together to cover the top of the connecting hardware 300 and the pole 20. The fastener protective cover 630 is manufactured and installed separately. This simplifies the installation of the insulating protective cover 600 and increases work efficiency. In other embodiments, the insulating protective cover can also be an integral structure, as long as it can be installed on the top of the pole and the connecting hardware to achieve the insulation function; no specific limitations are imposed here.

[0111] The technical content and features of this application have been disclosed above. However, it is understood that, based on the inventive concept of this application, those skilled in the art can make various changes and improvements to the above-described structure and materials, including combinations of the technical features disclosed or claimed herein, and explicitly including other combinations of these features. All such modifications and / or combinations fall within the technical field to which this application pertains and are within the scope of protection of the claims of this application.

Claims

1. A composite crossarm, characterized in that, include: The first crossarm has an inverted V-shaped structure, and the top and both ends of the first crossarm are used to hang wires. Two second crossarms, one end of each of the two second crossarms is connected to the middle of the first crossarm, and the other end of the second crossarms is used to connect to the pole. The length direction of the second crossarms is inclined. The second crossarms are located below the first crossarms and are in the same vertical plane as the first crossarms. Two connecting fittings are provided, and the other ends of the two second crossarms are respectively connected to both sides of the pole via the two connecting fittings.

2. The composite crossarm as described in claim 1, characterized in that, The first crossarm includes: Two first core rods are arranged at an included angle; Two first intermediate fittings are respectively connected to the middle parts of two second crossarms and two first mandrels; The second intermediate fitting has one end of each of the two first core rods connected to both sides of the second intermediate fitting, and the second intermediate fitting is used to hang the wire; Two end fittings are provided, each of which is connected to the other end of one of the two first core rods. The end fittings are used to hang the wire. A first insulating layer covers at least a portion of the outer peripheral surface of the first core rod.

3. The composite crossarm as described in claim 2, characterized in that, The first intermediate fitting includes: A first intermediate sleeve is sleeved on the middle part of the first core rod; The first intermediate connecting part is disposed on the bottom surface of the first intermediate sleeve, and the first intermediate connecting part is used to connect the second crossarm.

4. The composite crossarm as described in claim 2, characterized in that, The second intermediate fitting includes: The top connecting part is provided with a first hanging part, which is used to hang the wire by a wire clamp; Two second intermediate sleeves are respectively fitted onto one end of the two first core rods, and the two second intermediate sleeves are respectively connected to the two ends of the top connecting part.

5. The composite crossarm as described in claim 4, characterized in that, The top connecting part and the two second intermediate sleeves are an integral structure.

6. The composite crossarm as described in claim 4, characterized in that, The top connecting part and the second intermediate sleeve are detachably connected through the second intermediate connecting part, which is located at the end of the second intermediate sleeve that is not connected to the first mandrel. The top connecting part includes two top connecting plates, which clamp and fix the two second intermediate connecting parts. At least one of the top connecting plates is provided with the first hanging part.

7. The composite crossarm as described in claim 2, characterized in that, The end fitting includes a connected end sleeve and a second hook-up part. The end sleeve is used to connect to the other end of the first core rod, and the second hook-up part is used to hang the wire.

8. The composite crossarm as described in claim 7, characterized in that, The second attachment part includes an end plate and a hanging plate. The end plate covers the end of the end sleeve that is not connected to the first core rod. The hanging plate extends obliquely outward from the side of the end plate away from the end sleeve. The cross-sectional dimension of the end of the end sleeve connected to the end plate gradually decreases from the end of the first core rod toward the end plate.

9. The composite crossarm as described in claim 1, characterized in that, The second crossarm includes: Second core rod; The first fitting connects one end of the second mandrel to the middle of the first crossarm; The second fitting connects the other end of the second core rod to the connecting fitting. A second insulating layer covers at least a portion of the outer peripheral surface of the second core rod.

10. The composite crossarm as described in claim 1, characterized in that, The connecting fitting includes a pole connecting part and a crossarm connecting part connected together. The pole connecting part is connected to the pole, and the crossarm connecting part is connected to the other end of the second crossarm.

11. The composite crossarm as described in claim 10, characterized in that, The pole connecting part includes a first plate, which is abutted and fixed on the pole; the crossarm connecting part includes two second plates, which are perpendicularly connected to both ends of the first plate, and the two second plates extend in the same direction from both ends of the first plate away from the first plate. The second plates are provided with fixing holes for fixing the connecting hardware to the second crossarm.

12. The composite crossarm as described in claim 11, characterized in that, The second plate is also provided with an adjustment hole. The fixing hole and the adjustment hole cooperate to make the angle between the second crossarm and the pole adjustable. The fixing hole is a circular through hole, and the adjustment hole is an arc-shaped hole. The arc of the adjustment hole is concentric with the fixing hole.

13. The composite crossarm as described in claim 11, characterized in that, The pole connection part further includes a third plate for matching and connecting with the pole. The two ends of the third plate are respectively connected to the other ends of the two second plates that are not connected to the first plate. The length of the third plate along the length direction of the pole is less than the length of the second plate.

14. The composite crossarm as described in claim 4, characterized in that, The second intermediate fitting also includes two tension connecting parts, which are disposed on the top side of the top connecting part and symmetrically arranged along the vertical plane where the first crossarm is located. The tension connecting parts are used to connect the tension assembly.

15. The composite crossarm as described in claim 1, characterized in that, The composite crossarm also includes an insulating protective cover, which includes a connecting hardware protective cover and a pole protective cover. The connecting hardware protective cover is used to cover the connecting hardware, and the pole protective cover is used to cover the top of the pole.

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

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