Composite cross arm and power transmission pole

Abstract

The utility model discloses a composite cross arm which comprises a first cross arm, the first cross arm is of an inverted-V-shaped structure, and the top and the two ends of the first cross arm are used for hanging wires respectively; one end of each second cross arm is connected to the middle of the first cross arm, the other end of each second cross arm is used for being connected with an electric pole, the second cross arms are obliquely arranged in the length direction, the second cross arms are arranged below the first cross arms, and the second cross arms and the first cross arms are located in the same vertical plane; and the other ends of the two second cross arms are connected to the two sides of the electric pole through the two connecting fittings respectively. According to the composite cross arm, an all-insulation structure is adopted, the hanging height of the wire is integrally increased through the second cross arm, accidents such as tripping caused by electric shock of birds can be effectively prevented, the safety is higher, and the operation and maintenance cost is lower. The utility model further discloses a power transmission pole.

Description

Technical Field

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

[0002] Crossarms are components installed on overhead power lines' poles, primarily supporting the conductors. Traditional transmission poles use iron crossarms, which are attached to conductors via insulators. When bare conductors are used, birds taking off or landing from the poles could simultaneously come into contact with any two conductors, or any one conductor and the crossarm, creating an energized loop and potentially causing electric shock. This can directly impact the normal operation of power infrastructure, leading to accidents such as power outages, bird deaths, and reduced biodiversity.

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

[0004] In response to the shortcomings of the existing technology, one of the purposes of this application is to provide a composite crossarm that adopts a fully insulated structure and raises the hanging height of the wire by the second crossarm as a whole, which can effectively prevent accidents such as tripping caused by electric shock to birds, and has higher safety and lower operation and maintenance costs.

[0005] To achieve the above-mentioned purpose, 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 respectively; two second crossarms, one ends of the two second crossarms being respectively connected to the middle part of the first crossarm, the other ends of the second crossarms being used for connecting to the poles, the second crossarms being inclined in the length direction, the second crossarms being arranged below the first crossarm and being located in the same vertical plane as the first crossarm; two connecting hardware, the other ends of the two second crossarms being connected to both sides of the poles respectively through two connecting hardware.

[0006] Among them, the first cross arm includes: two first core rods, which are arranged at an angle; two first intermediate hardware, which are respectively connected to the two second cross arms and the middle parts of the two first core rods; second intermediate hardware, one end of the two first core rods is respectively connected to the two sides of the second intermediate hardware, and the second intermediate hardware is used to hang the wire; two end hardware, which are respectively connected to the other ends of the two first core rods, and the end hardware is used to hang the wire; a first insulating layer, which covers at least part of the outer circumference of the first core rod.

[0007] Among them, the first intermediate hardware includes: a first intermediate sleeve, which is sleeved on the middle part of the first core rod; a first intermediate connecting part, which is arranged on the bottom surface of the first intermediate sleeve and is used to connect the second cross arm.

[0008] Among them, the second intermediate hardware includes: a top connecting part, the top connecting part is provided with a first hanging part, the first hanging part is used to hang the wire through the wire clamp; two second intermediate sleeves, the two second intermediate sleeves are respectively sleeved on 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.

[0009] The top connecting portion and the two second intermediate sleeves are an integrated structure.

[0010] Among them, the top connecting part and the second intermediate sleeve are detachably connected through the second intermediate connecting part, and the second intermediate connecting part is arranged 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, and the two top connecting plates clamp and fix the two second intermediate connecting parts, and at least one top connecting plate is provided with a first hanging part.

[0011] The end fitting includes a connected end sleeve and a second hanging portion, the end sleeve is used to connect the other end of the first core rod, and the second hanging portion is used to hang the wire.

[0012] Among them, the second hanging 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 outward from the side of the end plate away from the end sleeve. The cross-sectional size of one 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] Among them, the second cross arm includes: a second core rod; a first hardware fitting, the first hardware fitting connects one end of the second core rod and the middle part of the first cross arm; a second hardware fitting, the second hardware fitting connects the other end of the second core rod and the connecting hardware; a second insulating layer, the second insulating layer covers at least part of the outer circumference of the second core rod.

[0014] The connecting fittings include a connected pole connecting portion and a crossarm connecting portion, the pole connecting portion is connected to the pole, and the crossarm connecting portion is connected to the other end of the second crossarm, and the angle between the second crossarm and the pole is adjustable.

[0015] Among them, the pole connecting part includes a first plate, which is abutted and fixed on the pole; the cross-arm connecting part includes two second plates, which are respectively vertically connected to the two ends of the first plate, and the two second plates extend in the same direction from the two ends of the first plate away from the first plate. The second plate is provided with a fixing hole and an adjustment hole, and the fixing hole and the adjustment hole are used to make the angle between the second cross-arm and the pole adjustable.

[0016] The fixing hole is a circular through hole, the adjusting hole is an arc-shaped hole, and the arc of the adjusting hole is concentrically arranged with the fixing hole.

[0017] Among them, the pole connecting part also includes a third plate, which is used to match and connect 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, and the third plate is located at the lower part of the second plate.

[0018] Among them, the second intermediate hardware also includes two tension-resistant connecting parts, which are arranged on the top side of the top connecting part and are symmetrically arranged along the vertical plane where the first cross arm is located. The tension-resistant connecting parts are used to connect the tension-resistant components.

[0019] Among them, the composite cross arm 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.

[0020] The second object of the present application is to provide a transmission pole, comprising a pole and the aforementioned composite cross-arm, wherein the composite cross-arm is fixed on the pole.

[0021] The beneficial effects of the present application are: different from the prior art, the composite crossarm of the present application includes a first crossarm, two second crossarms, and connecting hardware. The composite crossarm adopts a fully insulating structure as a whole and the hanging height of the conductor is raised by the second crossarm as a whole, thereby 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, so that no matter where the birds take off, stand or land on the transmission pole, no power circuit will be formed, effectively preventing accidents such as tripping caused by electric shocks to birds, with higher safety and lower operation and maintenance costs. At the same time, it can effectively reduce the chance of birds being electrocuted to death when landing on the transmission pole, thereby protecting biodiversity.

[0022] At the same time, this application connects the second crossarm and the pole through adjustable connecting hardware, and the angle between the second crossarm and the pole can be adjusted according to design requirements. The installation is flexible and the connection is reliable; and the independent hardware structure makes it suitable for installing composite crossarms of different lengths and specifications, with a wider range of applications.

[0023] In addition, compared with traditional iron crossarms, the use of composite crossarms to directly hang conductors can eliminate the suspended insulator structure, making the crossarm structure simpler, easier to install, less prone to rust, and longer in service life; and each insulating layer uses high-temperature vulcanized silicone rubber, which has good aging resistance and hydrophobic migration, which can reduce the probability of pollution flashover and rain flashover, and improve the electrical safety of the composite crossarm. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0025] Figure 2 This is a schematic structural diagram of a first cross arm 100 according to an embodiment of the present application;

[0026] Figure 3 This is an enlarged schematic diagram of a partial structure of the first intermediate hardware 120 fixed to the first core rod 110 in one embodiment of the present application;

[0027] Figure 4 yes Figure 2 A magnified schematic diagram of point A in the middle;

[0028] Figure 5 This is a schematic diagram of the wire hanging structure of the second intermediate hardware 130 according to one embodiment of the present application;

[0029] Figure 6 yes Figure 2 A magnified schematic diagram of point B in the middle;

[0030] Figure 7 1 is a partial structural diagram of a first cross arm 100 according to an embodiment of the present application;

[0031] Figure 8 This is a schematic diagram of the wire hanging structure of the end fitting 140 according to one embodiment of the present application;

[0032] Figure 9 1 is a schematic structural diagram of an end fitting 140 according to another embodiment of the present application;

[0033] Figure 10 This is a schematic structural diagram of a second cross arm 200 according to an embodiment of the present application;

[0034] Figure 11 1 is a schematic structural diagram of a connection fitting 300 according to an embodiment of the present application;

[0035] Figure 12 is a structural schematic diagram of a connection fitting 300 according to another embodiment of the present application;

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

[0037] Figure 14 This is a partial structural diagram of a transmission pole 2000 according to another embodiment of the present application;

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

[0039] Figure 16 It is a partial structural diagram of a transmission pole 1000 according to another embodiment of the present application. DETAILED DESCRIPTION

[0040] The specific embodiments of the present application will be disclosed here according to the requirements. However, it should be understood that the embodiments disclosed here are only typical examples of the present application, which can be embodied in various forms. Therefore, the specific details disclosed here should not be considered as limiting, but only as a representative basis for the claims and as a representative basis for teaching those skilled in the art to apply the present application differently in practice, including the use of various features disclosed here and in combination with features that can not be explicitly disclosed here.

[0041] Unless otherwise explicitly specified or limited, the "connection" described in the present application should be understood in a broad sense, which can be directly connected or connected through an intermediate medium. In the description of the present application, it should be understood that the orientation or position relationship indicated by "upper", "lower", "end", "one end" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0042] In an application scenario, as shown in Figure 1 The present application provides a power transmission pole 1000, which is a straight pole including a composite cross arm 10 and a pole 20, and the composite cross arm 10 is fixed on the pole 20. In the power system, the straight pole refers to a pole tower used for supporting the conductor in the middle of the line.

[0043] The composite cross arm 10 includes a first cross arm 100, two second cross arms 200 and two connecting fittings 300. The first cross arm 100 is in an inverted V-shaped structure, and the top and both ends of the first cross arm 100 are used for hanging conductors. The two second cross arms 200 are connected to the opposite sides of the pole 20 and form a V-shaped structure, one end of each of the two second cross arms 200 is connected to the middle of the first cross arm 100, and the other end of each of the two second cross arms 200 is connected to the two sides of the pole 20 through the two connecting fittings 300. The length direction of the second cross arm 200 is inclined, the second cross arm 200 is arranged below the first cross arm 100 and in the same vertical plane as the first cross arm 100.

[0044] The transmission pole 1000 of the present application utilizes a composite crossarm 10 for hanging conductors. The composite crossarm 10 utilizes a fully insulated structure, and the second crossarm 200 raises the overall height of the conductors. This extends the insulation distance between the conductors at the high-voltage end of the transmission pole 1000 and the top of the pole 20 at the low-voltage end. This prevents birds from forming an electrical circuit regardless of their location on the transmission pole 1000, effectively preventing accidents such as tripping caused by electrocution. This provides increased safety and lowers operational costs. It also effectively reduces the chance of birds being electrocuted and dying from landing on the transmission pole 1000, thereby protecting biodiversity. In traditional solutions, linear poles support conductors by providing suspended insulators on iron crossarms. Compared to traditional iron crossarms, the present application utilizes composite crossarms 10 for direct connection of conductors, eliminating the suspended insulator structure. This makes the crossarm structure simpler, installation more convenient, less prone to rust, and results in a longer service life.

[0045] It should be noted that, unless otherwise specified, the middle portion in this application refers to the portion between the two ends, not strictly the central portion.

[0046] Combine Figure 2 As shown, the first cross arm 100 includes two first core rods 110 (marked in the figure for schematic purposes only), two first intermediate hardware 120, a second intermediate hardware 130, two end hardware 140 and a first insulating layer 150. The two first core rods 110 are arranged at an angle; the two first intermediate hardware 120 are respectively connected to one end of the two second cross arms 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 hardware 130, and the second intermediate hardware 130 is used to hang the wire; the two end hardware 140 are respectively connected to the other end of the two first core rods 110, and the end hardware 140 is used to hang the wire; the first insulating layer 150 covers at least part of the outer circumference of the first core rod 110.

[0047] The two first core rods 110 are arranged at an angle, that is, the two first core rods 110 are arranged to tilt downward, and the axis extension lines of the two first core rods 110 intersect, so that the first cross arm 100 can form an inverted V-shaped structure for hanging three-phase conductors.

[0048] Combine Figure 3 and Figure 4As shown, the first intermediate hardware 120 includes a first intermediate sleeve 121 and a first intermediate connecting portion 122. The first intermediate sleeve 121 is sleeved on the middle part of the first core rod 110. Specifically, the first intermediate sleeve 121 is sleeved on the outer periphery of the first core rod 110 and fixed to the first core rod 110 through a crimping process; the side of the first intermediate sleeve 121 facing the second cross arm 200 is defined as the bottom surface, and the first intermediate connecting portion 122 is arranged on the bottom surface of the first intermediate sleeve 121. The first intermediate connecting portion 122 is used to connect the second cross arm 200.

[0049] The first intermediate sleeve 121 is a hollow tubular structure, and the cross-sectional shape and size of the first intermediate sleeve 121 match the cross-sectional shape 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 is increased, thereby ensuring the connection strength between the first intermediate sleeve 121 and the first core rod 110.

[0050] The first intermediate connecting portion 122 is a plate-like structure, which is vertically connected to the bottom surface of the first intermediate sleeve 121, and the first intermediate connecting portion 122 is located in the middle of the first intermediate sleeve 121, so that the force on the subsequent second cross arm 200 is more uniform after installation; the first intermediate connecting portion 122 is provided with a first connecting hole 1221, which is used to match and connect with the second cross arm 200 through fasteners such as bolts and screws, that is, there is no need to drill holes on the first intermediate sleeve 121 and the first core rod 110 for connection, thereby avoiding the drilling affecting the mechanical properties of the first core rod 110, and thus avoiding the occurrence of electrical safety hazards.

[0051] In one embodiment, if Figure 3 As shown, one first intermediate connecting part 122 can be provided, and the plate surface direction of the first intermediate connecting part 122 is provided 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, so that after the first intermediate hardware 120 is fixed on the first core rod 110, the plate surface direction of the first intermediate connecting part 122 and the length direction of the first cross arm 100 are located in the same vertical plane, which facilitates the assembly of the first cross arm 100 and the second cross arm 200.

[0052] In another embodiment, Figure 4 As shown, two first intermediate connecting parts 122 can be provided, and the two first intermediate connecting parts 122 are spaced apart and arranged on the two side edges 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 with the second cross arm 200 by clamping and fixing, and the connection strength between the first cross arm 100 and the second cross arm 200 is further improved without affecting the mechanical properties of the first core rod 110.

[0053] It is understandable that the number and specific configuration of the first intermediate connecting portions 122 may also be in other forms, as long as they can be matched and connected with the second cross arm 200 , and no specific limitation is imposed herein.

[0054] Combine Figure 5-Figure 7 As shown, the second intermediate fitting 130 includes a top connecting portion 131 and two second intermediate sleeves 132 connected to both ends of the top connecting portion 131. The top connecting portion 131 is provided with a first hanging portion 1311, which is used to hang the wire via a wire clamp. The two second intermediate sleeves 132 are respectively sleeved onto one end of the two first core rods 110. The second intermediate sleeves 132 are tubular structures with one end closed. The closed end is connected to the top connecting portion 131, and the open end is sleeved onto one end of the first core rod 110. The cross-sectional shape and size of the second intermediate sleeves 132 match the cross-sectional shape of the first core rod 110.

[0055] In one embodiment, if Figure 5 As shown, the top connecting portion 131 and the two second intermediate sleeves 132 are integrally formed. The top connecting portion 131 is a plate-like structure, and the two second intermediate sleeves 132 are directly fixed to either side of the top connecting portion 131. The axes of the two second intermediate sleeves 132 are arranged at an angle. In this way, when the first core rod 110 is crimped into the second intermediate sleeves 132, the two first core rods 110 can directly form an inverted V-shaped structure, which is simple and efficient to install. A first hanging portion 1311 is provided in the middle of the bottom side of the top connecting portion 131.

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

[0057] Combine Figure 5 As shown, the first hanging portion 1311 can also be a hanging hole provided in the middle portion of the bottom side of the top connecting portion 131. The hanging wire clamp 12 is directly hung in the hanging hole to hang the wire. This can further reduce the weight of the top connecting portion 131 and reduce costs. The hanging wire clamp 12 adopts a wire clamp structure known in the art and is not specifically limited here.

[0058] In another embodiment, combined Figure 6 and Figure 7 As shown, in order to make the assembly of the first cross arm 100 more flexible, the top connecting portion 131 and the second intermediate sleeve 132 are detachably connected through the second intermediate connecting portion 133 .

[0059] The second intermediate connecting portion 133 is located at the end of the second intermediate sleeve 132 that is not connected to the first mandrel 110. The second intermediate connecting portion 133 is a plate structure with its plate surface oriented axially along the second intermediate sleeve 132. A plurality of second connecting holes 1331 are defined in the second intermediate connecting portion 1333. The second connecting holes 1331 extend perpendicularly to the plate surface of the second intermediate connecting portion 133 and are configured to mate with the top connecting portion 131. The width of the second intermediate connecting portion 133 along the wire extension direction is smaller than that of the second intermediate sleeve 132. This ensures connection strength while reducing the weight of the second intermediate hardware 130 and lowering costs.

[0060] The top connecting portion 131 includes two top connecting plates 1312, which clamp and secure the two second intermediate connecting portions 133, effectively ensuring the connection strength between them and thus the overall mechanical strength of the first crossarm 100. The two top connecting plates 1312 are provided with two corresponding sets of top connecting holes 13121, located on either side of each top connecting plate 1312. The top connecting holes 13121 extend perpendicularly to the surface of the top connecting plate 1312, and each set of top connecting holes 13121 matches the number and position of the plurality 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 the two sets of top connecting holes 13121 is arranged at an angle. Correspondingly, the centers of the plurality of second connecting holes 1331 are all located on the axis of the second intermediate sleeve 132. Thus, when the first core rod 110 is installed within the second intermediate sleeve 132, and when the top connecting plate 1312 is mated and connected to the two second intermediate sleeves 132 via the two second intermediate connecting portions 133, the two first core rods 110 can directly form an inverted V-shaped structure, making installation simple and efficient. During installation, the two top connecting plates 1312 are sandwiched between the two second intermediate connecting portions 133, and after the two sets of top connecting holes 13121 on each top connecting plate 1312 are aligned with the plurality of second connecting holes 1331 on the two second intermediate connecting portions 133, fasteners such as bolts and screws are inserted and tightened to connect the top connecting portion 131 to the second intermediate sleeve 132. In other embodiments, the top connection hole and the second connection hole may also be arranged in other ways, as long as the two can be matched and connected so that the first cross arm has an inverted V-shaped structure as a whole. No specific limitation is made here.

[0061] Furthermore, the top connecting plate 1312 is roughly triangular in structure, and two groups of top connecting holes 13121 are respectively arranged on the two side edges of the top connecting plate 1312, which 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 portion 1311. The structure of the first hanging portion 1311 is as described above and will not be further described. In one embodiment, one first hanging portion 1311 is provided. When the first hanging portion 1311 adopts a wire hanging plate structure, a wire hanging plate can be directly extended from the middle portion of the bottom side of one of the top connecting plates 1312 to hang the suspension wire clamp 12. When the first hanging portion 1311 adopts a hanging hole structure, a hanging hole can be directly provided in the middle portion of the bottom side of one of the top connecting plates 1312 to hang the suspension wire clamp 12. A corresponding cavity is provided on the other top connecting plate 1312 to avoid interference with the first hanging portion 1311 hanging wire. In another embodiment, two first hanging portions 1311 are provided. Regardless of the structure of the first hanging portion 1311, the first hanging portions 1311 on the two top connecting plates 1312 are provided correspondingly. By cooperating with the two first hanging portions 1311 to hang the suspension wire clamp 12, the connection strength between the two can be further improved, thereby improving the overall mechanical strength of the first cross arm 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 portion 131, so that 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, and the horizontal heights of the wires hung at both ends of the first crossarm 100 are equal, and the distances from the wires hung on the top of the first crossarm 100 in the vertical direction are equal, so that the force on the first crossarm 100 is more balanced and the structure is more stable.

[0064] It can be understood that the 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 only needs to adjust the connection angle between the top connecting part 131 and the two second intermediate sleeves 132 accordingly. This can be achieved by replacing different second intermediate hardware 130 or providing multiple groups of top connecting holes 13121 with different angles on the top connecting plate 1312, and no specific restrictions are imposed here.

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

[0066] In one embodiment, if Figure 8 As shown, the end fitting 140 is a gland-type fitting that allows direct attachment of wires. It comprises a connected end sleeve 141 and a second attachment portion 142. End sleeve 141 is a tubular structure that is closed at one end and fits over the outer periphery of the end of the first core rod 110. Its cross-sectional shape and dimensions match those of the first core rod 110. Second attachment portion 142 comprises a base 1421, a gland 1422, and two tabs 1423. The base 1421 covers the end of the end sleeve 141 that is not connected to the first core rod 110. The base 1421 is provided with a first groove 14211, which is an arc-shaped groove for placing the wire. The base 1421 is provided with two mounting holes, which are respectively located on both sides of the first groove 14211 and are used to match and connect with the pressure cover 1422; the bottom of the pressure cover 1422 is provided with a second groove 14221, which is also an arc-shaped groove for assisting in fixing the wire. The first groove 14211 and the second groove 1422 1 is set in a direction perpendicular to the axial direction of the first core rod 110, and the two cooperate to facilitate the stable hanging of the wire; the two ears 1423 are respectively connected to the two sides of the gland 1422, and the two ears 1423 are located on both sides of the axial direction of the second slot 14221. The ears 1423 are provided with mounting holes, and the mounting holes on the two ears 1423 are arranged correspondingly with the mounting holes on the base 1421, so that the ears 1423 can be fastened to the base 1421 by fasteners such as bolts and screws, thereby enabling the gland 1422 to press and fix the wire. When installing the wire, the wire is placed in the first slot 14211, the gland 1422 is placed above the wire, so that the second slot 14221 is in contact with the top of the wire and presses the wire, and then the fasteners are passed through the mounting holes on the ears 1423 and the base 1421 and tightened to fix the gland 1422 and the base 1421, thereby fixing the wire firmly on the end fitting 140.

[0067] Furthermore, a hoisting portion 143 is provided at the bottom of the second hanging portion 142, and a hoisting hole 1431 is provided on the hoisting portion 143 to meet the hoisting requirements, that is, to be used for hoisting and installing the first cross arm 100 by means of tools such as ropes. The width of the hoisting portion 143 along the extension direction of the wire is smaller than the width of the end sleeve 141, which can reduce the weight of the end hardware 140 while ensuring the hanging effect, thereby reducing costs.

[0068] In another embodiment, Figure 9As shown, the end fitting 140 is a groove type clamp fitting, and the conductor can be hung by the support clamp 11. The end fitting 140 comprises 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 groove structure, which covers the end of the end sleeve 141 not connected to the first core rod 110, and the groove structure is a U-shaped groove, the groove opening of which is upwardly arranged, and mounting holes are correspondingly arranged on the two side walls of the U-shaped groove, for mounting the support clamp 11 by bolts, screws and other fasteners, so as to hang the conductor. The support clamp 11 comprises a clamp base and a clamp cover, and the clamp base is provided with an arc-shaped groove for placing the conductor, and the bottom of the clamp cover is correspondingly provided with an arc-shaped groove for assisting in fixing the conductor; mounting holes are correspondingly arranged on both sides of the arc-shaped grooves on the clamp base and the clamp cover, for tightly fixing the conductor between the clamp base and the clamp cover by bolts, screws and other fasteners; mounting holes are also arranged at both ends of the clamp base, for fixedly connecting with the two side walls of the U-shaped groove. When installing the conductor, first, the conductor is fixed on the support clamp 11, i.e. the conductor is placed in the arc-shaped groove of the clamp base, and the clamp cover is tightly fixed on the clamp base, then the support clamp 11 is placed in the groove structure of the end fitting 140, and the mounting holes at both ends of the clamp base are aligned with the mounting holes on the two side walls of the U-shaped groove, and then fasteners are arranged to fix the support clamp 11 in the groove structure, so as to stably hang the conductor on the end fitting 140. The bottom of the second hanging part 142 is provided with a lifting part 143, and 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 will not be specifically limited here.

[0069] In yet another embodiment, as Figure 2 and Figure 7As shown, the end fitting 140 is a plate-type wire clamp fitting, which can be used to hang the wire through the suspension clamp 12. The end fitting 140 includes a connected end sleeve 141 and a second hanging portion 142. The structure of the end sleeve 141 is as described above and will not be repeated here. The second hanging portion 142 is a plate structure, which includes a vertically connected end plate and a wire hanging plate. The end plate covers the end of the end sleeve 141 that is not connected to the first core rod 110. The wire hanging plate extends vertically outward from the side of the end plate away from the end sleeve 141. The wire hanging plate is provided with a mounting hole for mounting the suspension clamp 12 through components such as a U-shaped hanging ring to hang the wire. When installing the wire, first fix the wire on the suspension clamp 12, then assemble the suspension clamp 12 with the U-shaped hanging ring, and then clamp the U-shaped hanging ring on both sides of the hanging plate of the end hardware 140, and align the mounting holes on the U-shaped hanging ring with the mounting holes on the hanging plate, and then insert bolts, screws and other fasteners to hang the suspension clamp 12 on the hanging plate, so that the wire is firmly hung on the end hardware 140. The width of the hanging plate along the extension direction of the wire is smaller than the width of the end sleeve 141, which can reduce the weight of the end hardware 140 while ensuring the hanging effect, thereby reducing costs. The suspension clamp 12 adopts the wire clamp structure in the prior art and is not specifically limited here.

[0070] In other embodiments, the end fittings may also adopt existing fitting structures, as long as they can be used to hang wires, and no specific limitation is made here.

[0071] like Figure 1 and Figure 10 As shown, the second cross arm 200 includes a second core rod 210 (marked in the figure for schematic purposes only), a first hardware fitting 220, a second hardware fitting 230 and a second insulating layer 240. The first hardware fitting 220 connects one end of the second core rod 210 and the middle part of the first cross arm 100; the second hardware fitting 230 connects the other end of the second core rod 210 and the connecting hardware fitting 300; the second insulating layer 240 covers at least part of the outer circumference of the second core rod 210.

[0072] The first hardware 220 includes a 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 to the middle portion of the first crossarm 100. The first connecting portion 222 is a plate-like structure and is provided with a third connecting hole 2221, which is configured to mate with the first connecting hole 1221 on the first intermediate connecting portion 122 to achieve assembly of the first crossarm 100 and the second crossarm 200. During installation, the first connecting portion 222 is placed closely against the first intermediate connecting portion 122, and the third connecting hole 2221 is aligned with the first connecting hole 1221. Fasteners such as bolts and screws are then inserted and tightened to connect the first connecting portion 222 and the first intermediate connecting portion 122, thereby connecting one end of the second crossarm 200 to the middle portion of the first crossarm 100.

[0073] The second hardware 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 by a crimping process; the second connecting portion 232 is used to connect to the connecting hardware 300, and then connect the second crossarm 200 and the 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 connected to the two ends of the first connecting plate 2321 vertically, and the two second connecting plates 2322 extend in the same direction from the two ends of the first connecting plate 2321 in the direction away from the second sleeve 231, so that the second connecting portion 232 has a "匚"-shaped structure. Two groups of fourth connecting holes 23221 are provided on each second connecting plate 2322. The fourth connecting holes 23221 on the two second connecting plates 2322 are correspondingly arranged for matching and connecting with the connecting hardware 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, thereby avoiding the impact of drilling on the mechanical properties of the second core rod 210, thereby avoiding the occurrence of electrical safety hazards.

[0074] like Figure 1 、 Figure 10-12 As shown, 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 pole 20, and the cross arm connecting portion 320 is connected to the other end of the second cross arm 200, so that the angle between the second cross arm 200 and the pole 20 can be adjusted.

[0075] In the embodiment, the cross section of the electric pole 20 is square, and the electric pole connecting part 310 is correspondingly provided in a plate structure, so as to increase the contact area between the electric pole connecting part 310 and the electric pole 20 and ensure reliable connection therebetween. The electric pole connecting part 310 comprises a first plate member 311, and the first plate member 311 is provided with a first electric pole connecting hole 3111, which is used to abut and fix the first plate member 311 on the electric pole 20 by means of fasteners such as bolts and screws.

[0076] The cross arm connecting part 320 comprises two second plate members 321, which are substantially rectangular plate members. One end of each of the two second plate members 321 is connected perpendicularly to two ends of the first plate member 311, and the two second plate members 321 extend away from the first plate member 311 in the same direction. The distance between the mutually approaching plate surfaces of the two second plate members 321 is slightly greater than the distance between the mutually far-removed plate surfaces of the two second connecting plates 2322 of the second connecting part 232 of the second fitting 230. On the one hand, the second connecting part 232 can move between the two second plate members 321, so as to facilitate adjustment of the angle between the second cross arm 200 and the electric pole 20. On the other hand, the two second plate members 321 can clamp and fix the two second connecting plates 2322 by means of fasteners such as bolts and screws, so as to ensure reliable connection between the second cross arm 200 and the electric pole 20. The second plate member 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 circular arc of the adjusting hole 3212 is concentrically arranged with the fixing hole 3211, and the two are matched to enable the second cross arm 200 to rotate about the fixing hole 3211, so as to facilitate adjustment of the angle between the second cross arm 200 and the electric pole 20 and to fix and connect the second cross arm 200 and the connecting fitting 300. The fixing hole 3211 and the adjusting hole 3212 on each second plate member 321 are correspondingly arranged with two groups of fourth connecting holes 23221 on each second connecting plate 2322, so as to adjust the angle between the second cross arm 200 and the electric pole 20 and to fix and connect the second cross arm 200 and the connecting fitting 300, and then the angle between the second cross arm 200 and the electric pole 20 can be adjusted according to design requirements, so as to be flexible in installation and reliable in connection. Moreover, the independent fitting structure can be applied to installation of composite cross arms 10 of different length specifications, so as to have a wider application range.

[0077] In an embodiment, as Figure 11As shown, the length of the first plate member 311 along the length direction of the pole 20 is less than the length of the second plate member 321 near the side of the pole 20, and the first plate member 311 is connected to the upper part of the second plate member 321, and the fixing hole 3211 and the adjusting hole 3212 are located in the middle part of the second plate member 321, i.e. the fixing hole 3211 and the adjusting hole 3212 are located below the first pole connecting hole 3111, which can avoid the fasteners between the pole connecting part 310 and the pole 20 affecting the rotation adjustment of the angle between the second cross arm 200 and the pole 20, and also can reduce the material usage of the connecting fitting 300 and reduce the manufacturing cost.

[0078] When installing the connecting fitting 300, first, the first plate member 311 of the pole connecting part 310 is arranged close to the pole 20, and the first pole connecting hole 3111 on the first plate member 311 is aligned with the mounting hole on the pole 20, and then the fasteners such as bolts and screws are passed through and fastened, so as to fix the connecting fitting 300 on the pole 20. When installing the second cross arm 200, the second connecting part 232 is placed between the two second plate members 321, and the fixing hole 3211, the adjusting hole 3212 and the two groups of fourth connecting holes 23221 of the second connecting part 232 are aligned, and the fasteners such as bolts and screws are passed through the corresponding fixing hole 3211 and fourth connecting hole 23221, adjusting hole 3212 and fourth connecting hole 23221 for pre-fixing, i.e. under the premise of not affecting the rotation of the second connecting part 232 in the cross arm connecting part 320, the approximate positions of the two are defined, at this time the second cross arm 200 can rotate around the fixing hole 3211, i.e. when the second cross arm 200 rotates, the fasteners in the fixing hole 3211 remain in position, and the fasteners in the adjusting hole 3212 slide and adjust in the adjusting hole 3212 around the fixing hole 3211, when the angle between the second cross arm 200 and the pole 20 is adjusted to the preset angle, the above fasteners are fastened, so as to fix and connect the second cross arm 200 and the pole 20. In other embodiments, after the connecting fitting is fixed on the pole, the fasteners can be only passed through the corresponding fixing hole and fourth connecting hole for pre-fixing, when the second cross arm is adjusted in place, the fasteners are then fastened, and the fasteners are passed through and fastened in the corresponding adjusting hole and fourth connecting hole, so as to fix and connect the second cross arm and the pole, which is not specifically limited here.

[0079] Further, in order to make the connection between the connecting fitting 300 and the electric pole 20 more stable, the electric pole connecting portion 310 further comprises a third plate member 312, two ends of the third plate member 312 are respectively connected to the other ends of the two second plate members 321 which are not connected to the first plate member 311, so that the first plate member 311 and the third plate member 312 are respectively located on two sides of the second plate member 321, and the length of the third plate member 312 along the length direction of the electric pole 20 is less than the length of the second plate member 321, the third plate member 312 is connected to the lower part of the second plate member 321, and the third plate member 312 is provided with a second electric pole connecting hole 3121 for further fixing the connecting fitting 300 on the electric pole 20 by means of bolts, screws and other fasteners. The third plate member 312 is provided on one hand to make the upper and lower ends of the connecting fitting 300 can be fastened to the electric pole 20 through the first plate member 311 and the third plate member 312 at the same time, so that the force between them is more uniform and the connection is more reliable; on the other hand, the third plate member 312 is arranged at the end of the second plate member 321 away from the electric pole 20, which can avoid the interference between the third plate member 312 and the fasteners on the second plate member 321 during installation.

[0080] In another embodiment, as shown in Figure 12 the length of the first plate member 311 along the length direction of the electric pole 20 is equal to the length of the side of the second plate member 321 close to the electric pole 20, so that the contact area between the electric pole connecting portion 310 and the electric pole 20 can be increased, and the connection between them is more reliable. In addition, the second plate member 321 can also be a substantially right-angled trapezoidal plate member, that is, the lower edge of the second plate member 321 is horizontally arranged, and the upper edge of the second plate member 321 is arranged downwardly inclined from the upper end of the first plate member 311 toward the upper end of the third plate member 312, so that the material usage can be reduced while ensuring the connection strength of the connecting fitting 300, and the manufacturing cost can be reduced. It can be understood that the specific shape of the upper edge of the second plate member 321 can be adjusted according to the positions of the fixing holes 3211 and the adjusting holes 3212, as long as it does not affect the installation of the second cross arm 200, which is not specifically limited here.

[0081] It can be understood that when the length of the first plate 311 is smaller than the length of the second plate 321 on the side close to the pole 20 and the first plate 311 is located on the upper part of the second plate 321, the lower part of the connecting hardware 300 close to the pole 20 is a hollow structure. During installation, the connecting hardware 300 is first connected to the pole 20 through the first plate 311, and then the second cross arm 200 is installed and adjusted into place, and then bolts, screws and other fasteners are inserted into the second pole connecting hole 3121 on the third plate 312 and the installation hole on the pole 20 and tightened to further fix the connecting hardware 300 on the pole 20. When the length of the first plate 311 is equal to the length of the second plate 321 on the side close to the pole 20, the lower part of the first plate 311 is provided with a third pole connection hole (not shown) corresponding to the second pole connection hole 3121. During installation, the third plate 312 can be connected to the pole 20 by inserting bolts, screws and other fasteners through the second pole connection hole 3121, the third pole connection hole and the installation hole on the pole 20. The other steps are as described above.

[0082] Further, see Figure 11 Both second plates 321 are provided with flanges 3213, which extend vertically from the side of the second plate 321 close to the pole 20 in a direction away from the first plate 311, and the two flanges 3213 are located in the same plane as the first plate 311. The setting of the flanges 3213 can increase the contact area between the connecting hardware 300 and the pole 20, making the force between the two more uniform and the connection more reliable.

[0083] Combine 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 material of traditional crossarms, composite materials are more corrosion-resistant and low-cost, and can achieve significant weight reduction, making the composite crossarm 10 easy to install.

[0084] 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 configuration ensures that the composite cross-arm 10 has good overall structural strength, a 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, or other shapes, as long as the structure of each core rod meets the strength requirements. The core rods can have different or identical structures, for example, the first core rod can have a triangular cross-section and the second core rod can have a square cross-section, or the cross-sections of the core rods can all be square or circular, etc., without specific limitation.

[0085] In an embodiment, the cross section of the fitting sleeve on each core rod is matched with the cross section of the corresponding core rod, i.e. the cross section of the first intermediate sleeve 121, the second intermediate sleeve 132 and the end sleeve 141 is matched with the cross section of the first core rod 110, and the cross section of the first sleeve 221 and the second sleeve 231 is matched with the cross section of the second core rod 210, so as to fix each sleeve on the corresponding core rod and increase the contact area between each sleeve and the corresponding core rod, thereby ensuring the connection strength between each fitting and the corresponding core rod.

[0086] In an embodiment, each fitting is connected by welding after being separately formed into a fitting assembly, which is reliable and simple to manufacture. In other embodiments, each fitting can be integrally formed by casting or the like, as long as the connection strength between each assembly is ensured, which is not specifically limited herein.

[0087] In an embodiment, the first insulating layer 150 and the second insulating layer 240 each include a sheath, and the sheath of the first insulating layer 150 is in sealed connection with the first intermediate fitting 120, the second intermediate fitting 130 and the end fitting 140 at both ends of the first core rod 110, and the sheath of the second insulating layer 240 is in sealed connection with the first fitting 220 and the second fitting 230 at both ends of the second core rod 210, which can effectively prevent external moisture from damaging the first core rod 110 and the second core rod 210, thereby avoiding affecting the service life of the composite cross arm 10.

[0088] Further, the first insulating layer 150 and the second insulating layer 240 can further include a shed arranged on the sheath, and the shed can increase the creepage distance of the outer surface of the first cross arm 100 and the second cross arm 200, so that the composite cross arm 10 has sufficient dry arc distance. In addition, the shed can also prevent birds from nesting, thereby improving the overall electrical safety of the composite cross arm 10.

[0089] In an embodiment, the first insulating layer 150 and the second insulating layer 240 are high-temperature vulcanized silicone rubber, and the silicone rubber material is coated on the outer periphery of the first core rod 110 and the second core rod 210 by integral vacuum injection molding process, thereby forming a high-temperature vulcanized silicone rubber insulating layer. The high-temperature vulcanized silicone rubber has good aging resistance and hydrophobic migration, which can reduce the probability of pollution flashover and rain flashover, thereby improving the electrical safety of the composite cross arm 10. In other embodiments, the first insulating layer and the second insulating layer can also be formed by a molding process or pre-formed and then sleeved on the outer periphery of the corresponding core rod, which is not specifically limited herein.

[0090] It can be understood that the overall length of the composite crossarm 10 of the present application, the length of the first crossarm 100 and the second crossarm 200, the specifications of the support wire clamp 11 and the suspension wire clamp 12, etc. can be adjusted accordingly according to needs; and the installation order of the composite crossarm 10 can also be adjusted accordingly according to needs, that is, the two second crossarms 200 can be fixed to the pole 20 through the connecting hardware 300 first, and then the first crossarm 100 can be fixed, or 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.

[0091] In another application scenario, such as Figure 13-15 As shown, the present 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 the power system, a tension pole refers to a tower used to segment the circuit in the middle of a line to control the scope of pole collapse and line breakage. The tension pole is equipped with tension components and tension clamps on the crossarm to hang the conductors.

[0092] The composite crossarm 30 includes a first crossarm 400, two second crossarms 200, two connecting hardware 300 and two tension components 500. The structure of the composite crossarm 30 is basically similar to that of the composite crossarm 10, except that the two ends of the first crossarm 400 are used to connect to the tension clamps 13 to hang the conductors; one end of the two tension components 500 are respectively connected to the two sides of the top 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 conductors. The length direction of the tension component 500 is perpendicular to the vertical plane where the first crossarm 400 is located.

[0093] Specifically, the second intermediate hardware 430 of the first cross arm 400 also includes two tension-resistant connecting parts 434, which are arranged on the top side of the top connecting part 431 and symmetrically arranged along the vertical plane where the first cross arm 400 is located. The tension-resistant connecting parts 434 are used to connect the tension-resistant assembly 500.

[0094] In one embodiment, if Figure 13 As shown, the tension connection part 434 is a plate-like structure, and a tension connection hole is provided on the tension connection part 434 for connecting the tension component 500 through a connecting component such as a hanging ring. At this time, the tension component 500 can be a tension insulator.

[0095] In another embodiment, Figure 14As shown, when the top connection portion 431 includes two top connection plates, the tension connection portion 434 can also be a tension connection hole provided on the top side of the top connection plate, which is 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 hardware. The tension hardware is an L-shaped structure as a whole, including a first connecting plate 510 and a second connecting plate 520 connected vertically, wherein the first connecting plate 510 is used to match and connect with the top connection portion 431, and the second connecting plate 520 is used to connect the tension clamp 13 through a connecting component such as a hanging ring; the tension hardware also includes a reinforcing rib 530, which vertically connects the first connecting plate 510 and the second connecting plate 520 at the same time, which can further improve the mechanical strength of the tension hardware.

[0096] The first attachment portion of the second intermediate hardware 430 is connected to a suspension clamp 12 for attaching a jumper wire. Specifically, a wire attached to one of the tension components 500 extends from the tension clamp 13 to a jumper wire. The jumper wire 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 wire is electrically connected to the wires on both sides of the pole 40.

[0097] In one embodiment, if Figure 13 As shown, the end fitting 440 includes an end sleeve 441 and a second hanging part 442. The second hanging part 442 specifically hangs the wire through the tension clamp 13. The second hanging part 442 is arranged on the side of the end sleeve 441 that is not connected to the first core rod 410. The second hanging part 442 is a plate-like structure. The second hanging part 442 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. A hanging hole is provided on the hanging plate 4421 for hanging the triangular connecting plate 443 through a connecting component such as a U-shaped hanging ring. Two wire clamp connecting holes are provided at both ends of the bottom of the triangular connecting plate 443, which are respectively used to connect two tension clamps 13. By hanging the wires with the tension clamp 13 through the triangular connecting plate 443, on the one hand, the distance between the tension jumpers can be guaranteed, thereby ensuring the electrical safety of the composite cross arm 30; on the other hand, a certain degree of rotatability can be provided. When longitudinal unbalanced tension occurs in the wires on both sides of the composite cross arm 30, the triangular connecting plate 443 and the tension clamp 13 can be deflected, so that parameters such as the span of the wires on both sides (the horizontal distance between the wire hanging points of two adjacent transmission towers) change. Then, when deflected to the appropriate position, the tension of the wires on both sides reaches a new balance, completing the release of the unbalanced tension, reducing the stress on the composite cross arm 30, and extending its service life.

[0098] In another embodiment, Figure 15As shown, the wire hanging plate 4421 of the second hanging part 442 of the end fitting 440 extends outward obliquely from the side of the end plate away from the end sleeve 441, and when the end fitting 440 is crimped on the end of the first core rod 410 and installed on the pole 40, the wire hanging plate 4421 is set horizontally, and a number of hanging holes are provided on the wire hanging plate 4421 for connecting the rectangular connecting plate 444. Two wire clamp connection holes are provided at both ends of the rectangular connecting plate 444, which are respectively used to connect two tension clamps 13. The specific connection method is as described above and will not be repeated here. 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 dimensions of one end of the end sleeve 441 connected to the end plate gradually decrease from the end of the first core rod 410 toward the end plate, so that the end sleeve 441 can firmly connect the first core rod 410 and the end plate while using less material, and the two ends of the rectangular connecting plate 444 can adopt a trapezoidal or arc-shaped structure, so that the rectangular connecting plate 444 can meet the requirements of opening the hanging hole while using less material, thereby reducing costs.

[0099] The tension insulator can adopt the tension composite insulator structure in the existing technology, the tension clamp 13 can adopt the clamp structure in the existing technology, and the installation method of the tension insulator and the tension clamp 13 can also be achieved by adopting the existing technology, which is not specifically limited here.

[0100] Furthermore, the composite cross arm 10 on the linear rod and the composite cross arm 30 on the tension rod may further include an insulating protective cover 600. The following description will be made using the linear rod as an example. Figure 16 As shown, the insulating protective cover 600 includes a connection hardware protective cover 610 and a pole protective cover 620. The connection hardware protective cover 610 is used to cover the connection hardware 300, and the pole protective cover 620 is used to cover the top of the pole 20. The connection hardware protective cover 610 and the pole protective cover 620 cooperate with each other to cover the metal structure at the top of the pole 20, thereby strengthening the insulation effect of the top of the pole 20, further preventing birds from being electrocuted when taking off, standing or landing on the top of the pole 20 by forming an electric circuit, further reducing the probability of birds being electrocuted and protecting biodiversity. The specific structure is as described above and will not be repeated here.

[0101] Furthermore, the main structure of the insulating protective cover 600 is a rectangular structure with an open bottom, which is convenient for the installation of the insulating protective cover 600; and a number of cavities are provided on the insulating protective cover 600 for passing part of the structure of the second cross arm 200 or fasteners such as bolts and nuts.

[0102] The main body structure of the connecting fitting protective cover 610 is a bottom-opened cuboid structure, the size of the cuboid matches the size of the connecting fitting 300, and the size of the bottom opening matches the horizontal cross-sectional size of the connecting fitting 300, so that the connecting fitting protective cover 610 can completely cover the connecting fitting 300 from top to bottom, while saving material cost; the connecting fitting protective cover 610 is provided with a plurality of cavities, one of which is arranged corresponding to the second cross arm 200, that is, corresponding to the position where the second cross arm 200 extends out of the connecting fitting 300, and the remaining cavities are arranged corresponding to the mounting positions of the composite cross arm 10, that is, corresponding to the first electric pole connecting hole 3111, the fixing hole 3211 and the adjusting hole 3212, the second electric pole connecting hole 3121 and the third electric pole connecting hole, which facilitates the installation of the composite cross arm 10 and the penetration of fasteners while ensuring the insulation effect.

[0103] The main body structure of the electric pole protective cover 620 is a bottom-opened cuboid structure, the size of the cuboid matches the size of the top of the electric pole 20, and the size of the bottom opening matches the horizontal cross-sectional size of the electric pole 20, so that the electric pole protective cover 620 can cover the top of the electric pole 20 from top to bottom while saving material cost; the electric pole protective cover 620 is provided with a plurality of cavities, which are arranged corresponding to the mounting holes on the electric pole 20, which facilitates the installation of the composite cross arm 10 and the penetration of fasteners while ensuring the insulation effect.

[0104] Further, the side surfaces of the connecting fitting protective cover 610 and the electric pole protective cover 620 corresponding to each other are provided with side openings, the size of the side openings matches the vertical cross-sectional size of the connecting fitting 300 with the largest area, so that the first plate 311 can be tightly installed on the electric pole 20, ensuring the connection strength between the connecting fitting 300 and the electric pole 20, and further ensuring the stable installation of the composite cross arm 10.

[0105] Further, the top of the connecting fitting protective cover 610 and the electric pole protective cover 620 is a pointed top structure, the pointed end of the pointed top structure is arranged upward, so that when each protective cover is installed, the pointed top structure can avoid birds standing and staying on the top of the electric pole 20 and the top of the connecting fitting 300, further reducing the probability of bird electrocution and protecting biodiversity. The pointed top structure can be a circular cone or a pyramid structure, which is simple in structure and easy to manufacture.

[0106] Further, the insulation protective cover 600 further includes a fastener protective cover 630 for covering the nuts and other fasteners that need to be penetrated during the installation of the connecting fitting 300 and the electric pole 20, further improving the coverage rate of the metal structure on the top of the electric pole 20, thereby further enhancing the insulation effect of the top of the electric pole 20.

[0107] The insulating protective cover 600 is made of silicone rubber, which has excellent insulation performance and can ensure the insulation effect of the insulating protective cover 600, or the insulating protective cover can also be made of other insulating materials, which is not limited here.

[0108] In the embodiment, the insulating protective cover 600 is a split structure, that is, each protective cover is manufactured and installed respectively, and in other embodiments, the insulating protective cover can also be a one-piece structure, as long as it can be installed on the top of the pole and the connecting hardware to achieve the insulation function, which is not limited here.

[0109] The beneficial effects of the present application are that: unlike the prior art, the composite cross arm of the present application includes a first cross arm, two second cross arms, and connecting hardware, through the overall insulating structure of the composite cross arm and the overall lifting of the hanging height of the wires by the second cross arm, the insulation distance between the wires of the high-voltage end of the power transmission pole and the top of the low-voltage end of the pole is extended, so that birds will not form a closed circuit no matter where they take off, stand or land on the power transmission pole, 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 bird electrocution, protecting biodiversity.

[0110] At the same time, the adjustable connecting hardware connects the second cross arm and the pole, and can adjust the angle between the second cross arm and the pole according to design requirements, flexible installation and reliable connection; and the independent hardware structure makes it applicable to install composite cross arms of different length specifications, with a wider application range.

[0111] In addition, compared with the traditional iron cross arm, the composite cross arm of the present application directly hangs the wires, which can cancel the suspension insulator structure, making the cross arm structure simpler, easier to install, less prone to rust, and longer service life; and each insulating layer is made of high-temperature vulcanized silicone rubber, which has good aging resistance and hydrophobic migration, can reduce the probability of pollution flashover and rain flashover, and improve the electrical safety of the composite cross arm.

[0112] The technical content and technical features of the present application have been disclosed as above, however, it can be understood that under the creative idea of the present application, those skilled in the art can make various changes and improvements to the above structure and material, including the combination of technical features disclosed or claimed separately herein, obviously including other combinations of these features. These modifications and / or combinations all fall within the technical field to which the present application relates, and fall within the protection scope of the claims of the present application.

Claims

1. A composite cross arm, characterized in that: include: a first cross arm, wherein the first cross arm has an inverted V-shaped structure, and the top and both ends of the first cross arm are respectively used for hanging conductors; Two second cross arms, one end of each of the second cross arms is connected to the middle of the first cross arm, the other end of the second cross arm is used to connect to the electric pole, the second cross arms are arranged obliquely in the longitudinal direction, and the second cross arms are arranged below the first cross arm and are located in the same vertical plane as the first cross arm; Two connecting hardware, the other ends of the two second cross arms are respectively connected to the two sides of the pole through the two connecting hardware.

2. The composite cross arm according to claim 1, characterized in that: The first cross arm comprises: Two first core rods, the two first core rods are arranged at an angle; Two first intermediate hardware pieces, the two first intermediate hardware pieces respectively connecting the two second cross arms and the middle portions of the two first core rods; a second intermediate hardware, one end of each of the two first core rods being connected to two sides of the second intermediate hardware, the second intermediate hardware being used for hanging the wire; Two end fittings, the two end fittings are respectively connected to the other ends of the two first core rods, and the end fittings are used to hang the wires; A first insulating layer covers at least a portion of an outer circumference of the first core rod.

3. The composite cross arm according to claim 2, characterized in that: The first intermediate hardware includes: a first intermediate sleeve, which is sleeved on the middle part of the first core rod; A first intermediate connecting portion is provided on the bottom surface of the first intermediate sleeve, and is used to connect the second cross arm.

4. The composite cross arm according to claim 2, characterized in that: The second intermediate hardware includes: a top connecting portion, the top connecting portion is provided with a first hanging portion, the first hanging portion is used to hang the wire through a wire clamp; Two second intermediate sleeves are respectively sleeved on the one ends 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 cross arm according to claim 4, characterized in that: The top connecting portion and the two second intermediate sleeves are an integrated structure.

6. The composite cross arm according to claim 4, characterized in that: The top connecting part and the second intermediate sleeve are detachably connected through the second intermediate connecting part, and the second intermediate connecting part is arranged 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, and the two top connecting plates clamp and fix the two second intermediate connecting parts, and at least one of the top connecting plates is provided with the first hanging part.

7. The composite cross arm according to claim 2, characterized in that: The end fitting includes an end sleeve and a second hanging portion connected to each other. The end sleeve is used to connect to the other end of the first core rod, and the second hanging portion is used to hang the wire.

8. The composite cross arm according to claim 7, characterized in that: The second hanging 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 outward from the side of the end plate away from the end sleeve. The cross-sectional size 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 cross arm according to claim 1, wherein: The second cross arm comprises: a second mandrel; a first hardware fitting connecting one end of the second core rod and a middle portion of the first cross arm; a second hardware fitting connecting the other end of the second core rod and the connecting hardware fitting; and a second insulating layer covering at least a portion of the outer circumference of the second core rod.

10. The composite cross arm according to claim 1, wherein: The connecting fitting includes a connected pole connecting part and a cross arm connecting part, the pole connecting part is connected to the pole, and the cross arm connecting part is connected to the other end of the second cross arm, so that the angle between the second cross arm and the pole can be adjusted.

11. The composite cross arm according to claim 10, wherein: The pole connecting part includes a first plate, which is abutted and fixed on the pole; the cross arm connecting part includes two second plates, which are respectively vertically connected to the two ends of the first plate, and the two second plates extend in the same direction from the two ends of the first plate away from the first plate, and the second plates are provided with fixing holes and adjustment holes, and the fixing holes and the adjustment holes are used to make the angle between the second cross arm and the pole adjustable.

12. The composite cross arm according to claim 11, wherein: The fixing hole is a circular through hole, and the adjusting hole is an arc-shaped hole. The arc of the adjusting hole is concentrically arranged with the fixing hole.

13. The composite cross arm according to claim 11, wherein: The pole connecting part also includes a third plate for matching and connecting with the pole, and 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, and the third plate is located below the second plate.

14. The composite cross arm according to claim 4, characterized in that: The second intermediate hardware also includes two tension-resistant connecting parts, which are arranged on the top side of the top connecting part and are symmetrically arranged along the vertical plane where the first cross arm is located. The tension-resistant connecting parts are used to connect tension-resistant components.

15. The composite cross arm according to claim 1, wherein: The composite cross arm further comprises an insulating protective cover, which comprises a connecting fitting protective cover and a pole protective cover. The connecting fitting protective cover is used to cover the connecting fitting, and the pole protective cover is used to cover the top of the pole.

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

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