Composite cross arm and power transmission pole

Abstract

The application discloses a composite cross arm, comprising a first cross arm whose length direction is arranged along a horizontal direction and whose two ends are used for hanging a wire through strain clamps; one end of each second cross arm is connected to the middle of the corresponding 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, and the second cross arms are arranged below the first cross arms and located in the same vertical plane with the first cross arms; the other ends of the two second cross arms are connected with the two sides of the electric pole through the two connecting fittings respectively; one end of the third cross arm is connected with the middle of the first cross arm, the other end of the third cross arm is used for hanging a jumper wire, and the length direction of the third cross arm is arranged in the vertical direction and located above the first cross arm; one ends of the two strain insulators are connected to the two sides of the middle of the first cross arm respectively, the other ends of the two strain insulators are used for hanging wires through strain clamps, and the length direction of the strain insulators is perpendicular to the length direction of the first cross arm. 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, with 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 length direction of the first crossarm is arranged in the horizontal direction, and the two ends of the first crossarm are used to hang the conductors through the tension clamp; two second crossarms, one end of the two second crossarms is respectively connected to the middle part of the first crossarm, and the other end of the second crossarm is used to connect to the pole, the length direction of the second crossarm is inclined, the second crossarm is arranged below the first crossarm and is located in the same vertical plane as the first crossarm; two connecting hardware, the other ends of the two second crossarms are respectively connected to the two sides of the pole through two connecting hardware; a third crossarm, one end of the third crossarm is connected to the middle part of the first crossarm, and the other end of the third crossarm is used to hang the jumper, the length direction of the third crossarm is arranged in the vertical direction and is located above the first crossarm; two tension insulators, one end of the two tension insulators is respectively connected to both sides of the middle part of the first crossarm, and the other end of the tension insulator is used to hang the conductors through the tension clamp, and the length direction of the tension insulator is perpendicular to the length direction of the first crossarm.

[0006] Among them, the first crossarm includes: a first core rod; two first intermediate hardware fittings, which respectively connect the two second crossarms and two different positions in the middle of the first core rod; a second intermediate hardware fitting, which is located between the two first intermediate hardware fittings and connects the third crossarm, the tension insulator and the middle of the first core rod; two end hardware fittings, which are respectively connected to the two ends of the first core rod, and the end hardware fittings are used to hang the conductor through the tension clamp; 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 side of the first intermediate sleeve and is used to connect the second cross arm.

[0008] Among them, the second intermediate hardware includes: a second intermediate sleeve, which is sleeved on the middle part of the first core rod; a second intermediate connecting part, which is arranged on the top side of the second intermediate sleeve, and the second intermediate connecting part is used to connect the third crossarm; two insulator connecting parts, which are arranged on the bottom side of the second intermediate sleeve and are symmetrically arranged along the axis of the second intermediate sleeve, and the insulator connecting parts are used to connect tension insulators.

[0009] Among them, the end hardware includes an end sleeve and two hanging parts. The end sleeve is used to connect the end of the first core rod; the two hanging parts are arranged on the bottom side of the end sleeve and are symmetrically arranged along the axis of the end sleeve. The hanging parts are used to hang the wire through the tension clamp.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] 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 first plate and the third plate along the length direction of the pole is less than the length of the second plate, and the first plate and the third plate are respectively located on the upper and lower parts of the second plate.

[0015] 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.

[0016] 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, connecting hardware, and a third crossarm. The composite crossarm adopts a fully insulated 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.

[0017] 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.

[0018] 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

[0019] Figure 1 1 is a schematic structural diagram of a transmission pole 1000 according to an embodiment of the present application;

[0020] Figure 2 1 is a partial structural diagram of a first cross arm 100 according to an embodiment of the present application;

[0021] Figure 3 yes Figure 2 A magnified schematic diagram of point A in the middle;

[0022] Figure 4 yes Figure 2 A magnified schematic diagram of point B in the middle;

[0023] Figure 5 This is a schematic structural diagram of a second intermediate hardware 130 according to another embodiment of the present application;

[0024] Figure 6 This is a schematic structural diagram of a second cross arm 200 according to an embodiment of the present application;

[0025] Figure 7 1 is a schematic structural diagram of a connection fitting 300 according to an embodiment of the present application;

[0026] Figure 8 It is a structural diagram of the third cross arm 400 according to one embodiment of the present application. DETAILED DESCRIPTION

[0027] Upon request, specific embodiments of the present application will be disclosed herein. However, it should be understood that the embodiments disclosed herein are merely exemplary of the present application, which may be embodied in various forms. Therefore, the specific details disclosed herein are not to be construed as limiting, but merely as a basis for the claims and as a representative basis for teaching those skilled in the art to variously apply the present application in any appropriate manner in practice, including employing the various features disclosed herein in combination with features that may not be explicitly disclosed herein.

[0028] Unless otherwise expressly specified or limited, the term "connection" as used in this application should be understood in a broad sense, and may refer to direct connection or connection through an intermediate medium. In the description of this application, it should be understood that the orientations or positional relationships indicated by terms such as "upper," "lower," "end," and "one end" are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of this application and simplify the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0029] In an application scenario, such as Figure 1 As shown, the present application provides a transmission pole 1000, which is a tension pole and includes a composite crossarm 10 and a pole 20. The composite crossarm 10 is fixed to the pole 20. 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 insulators and tension clamps on the crossarm to hang the conductors.

[0030] The composite crossarm 10 includes a first crossarm 100, two second crossarms 200, two connecting hardware 300, a third crossarm 400 and two tension insulators 500. The length direction of the first crossarm 100 is arranged in the horizontal direction, and the two ends of the first crossarm 100 are used to connect to the tension clamps 13 to hang the conductors; one end of the two tension insulators 500 is respectively connected to the two sides of the middle part of the first crossarm 100, and the other end of the tension insulator 500 is used to connect to the tension clamps 13 to hang the conductors. The length direction of the tension insulator 500 is perpendicular to the length direction of the first crossarm 100. One end of each of the two second crossarms 200 is connected to the middle of the first crossarm 100, and the other end of each second crossarm 200 is used to connect to the pole 20. The length of each second crossarm 200 and the length of the first crossarm 100 are located in the same vertical plane, and the second crossarm 200 is located below the first crossarm 100. The other ends of each of the two second crossarms 200 are connected to the sides of the pole 20 via two connecting fittings 300. One end of the third crossarm 400 is connected to the middle of the first crossarm 100, and the other end of the third crossarm 400 is used to hang jumpers. The length of the third crossarm 400 is arranged vertically and is located above the first crossarm 100. The second crossarm 200 is tilted in its length direction, which can raise the overall height of the wire hanging, reducing the size of each crossarm while meeting the insulation distance, thus saving costs. Of course, the second crossarm can also be arranged vertically, and the length of the third crossarm can be increased to meet the insulation distance requirements.

[0031] 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 elevates the conductor's hanging height. This extends 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 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 conventional solutions, transmission poles support conductors by providing suspended insulators on iron crossarms. Compared to conventional iron crossarms, the present application utilizes a composite crossarm 10 for direct conductor hanging, 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.

[0032] 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.

[0033] Combine Figures 1-4As shown, the first cross arm 100 includes a first core rod 110 (marked in the figure for schematic purposes only), two first intermediate hardware fittings 120, a second intermediate hardware fitting 130, two end hardware fittings 140 and a first insulating layer 150. The two first intermediate hardware fittings 120 respectively connect the two second cross arms 200 and two different positions in the middle of the first core rod 110; the second intermediate hardware fitting 130 is located between the two first intermediate hardware fittings 120, and the second intermediate hardware fitting 130 connects the third cross arm 400 and the middle of the first core rod 110; the two end hardware fittings 140 are respectively connected to the two ends of the first core rod 110, and the end hardware fittings 140 are used to hang the wires; the first insulating layer 150 covers at least part of the outer circumference of the first core rod 110.

[0034] 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 on the first core rod 110 through a crimping process; the first intermediate connecting portion 122 is arranged on the bottom side of the first intermediate sleeve 121, and the first intermediate connecting portion 122 is used to connect the second cross arm 200.

[0035] 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.

[0036] The first intermediate connecting portion 122 is a plate-like structure, which is vertically connected to the bottom side 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. In this embodiment, the plate surface direction of the first intermediate connecting part 122 is set 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. In other embodiments, the plate surface direction of the first intermediate connecting part can also be set along other directions, as long as it can be matched and connected with the second cross arm, and no specific restrictions are made here.

[0037] The second intermediate fitting 130 includes a second intermediate sleeve 131 and a second intermediate connecting portion 132. The second intermediate sleeve 131 is sleeved over the middle portion of the first mandrel 110. Specifically, the second intermediate sleeve 131 is sleeved over the outer circumference of the first mandrel 110 and secured to the first mandrel 110 via a crimping process. The second intermediate connecting portion 132 is disposed on the top side of the second intermediate sleeve 131 and is used to connect to the third crossarm 400. Preferably, the second intermediate sleeve 131 is sleeved over the middle portion of the outer circumference of the first mandrel 110, and the first intermediate sleeves 121 of the two first intermediate fittings 120 are symmetrically disposed on either side of the second intermediate sleeve 131. This results in a symmetrical structure for the first crossarm 100 as a whole, more balanced stress distribution, and a more stable structure.

[0038] The second intermediate connecting portion 132 is formed by connecting a plurality of plates, at least one of which is arranged horizontally to facilitate the installation of the third cross arm 400. The structure of the second intermediate sleeve 131 is similar to that of the first intermediate sleeve 121 and will not be described in detail here.

[0039] In one embodiment, if Figure 4 As shown, the several plates of the second intermediate connecting portion 132 include five plates, and the five plates are connected in sequence so that the second intermediate connecting portion 132 is in a "J"-shaped structure. For the convenience of explanation, the plates at both ends of the second intermediate connecting portion 132 are defined as first end plates 1321, the plate located in the middle is defined as first top plate 1322, and the plate located between the first top plate 1322 and the first end plate 1321 is a first side plate 1323. The two first end plates 1321 are connected to the middle of the top side of the second intermediate sleeve 131 at intervals in the horizontal direction, and the two first side plates 1323 are arranged between the two first end plates 1321 and are symmetrically arranged about the first top plate 1322 in the vertical direction. Specifically, the two first side panels 1323 are arranged vertically or inclined relative to the vertical direction. One end of the two first side panels 1323 is connected to the two first end panels 1321, and the other end of the two first side panels 1323 is connected to the two ends of the first top panel 1322. The first top panel 1322 is arranged horizontally and has at least one second connection hole 13221 provided therein for mating and connecting with the third cross arm 400 via fasteners such as bolts and screws. This eliminates the need to drill holes in the second intermediate sleeve 131 and the first core rod 110 for connection, thus preventing drilling from affecting the mechanical properties of the core rod 110 and thereby avoiding electrical safety hazards. A gap is left between the first top panel 1322 and the top side of the second intermediate sleeve 131 to form an installation space, making it easier for construction workers to tighten fasteners such as bolts and screws.

[0040] In another embodiment, Figure 5As shown, the several plates of the second intermediate connecting part 132 of the second intermediate hardware 130 include two plates, and the two plates are vertically connected to each other so that the second intermediate connecting part 132 is an L-shaped structure, one of the plates is vertically connected to the middle of the top side of the second intermediate sleeve 131, that is, the plate is arranged in the vertical direction, so that the other plate is arranged in the horizontal direction. For the convenience of explanation, the vertically arranged plate is defined as the second side plate 1324, and the horizontally arranged plate is defined as the second top plate 1325. The second top plate 1325 is provided with at least one second connecting hole 13251, which is used to match and connect with the third cross arm 400 through fasteners such as bolts and screws, that is, there is no need to drill holes on the second intermediate sleeve 131 and the first core rod 110 for connection, so as to avoid drilling affecting the mechanical properties of the core rod 110, thereby avoiding electrical safety hazards.

[0041] Combine Figure 1 The second intermediate hardware 130 also includes two insulator connecting parts 133, which are arranged on the bottom side of the second intermediate sleeve 131 and symmetrically arranged along the axis of the second intermediate sleeve 131. The insulator connecting parts 133 are used to connect the tension insulator 500; the insulator connecting part 133 is a plate-like structure, and an insulator connecting hole is provided on the insulator connecting part 133, which is used to connect the tension insulator 500 through a connecting component such as a hanging ring. The top hardware of the third crossarm 400 is used to hang a jumper. Specifically, the wire hung on one of the tension insulators 500 leads out a jumper from the tension clamp 13. The jumper is first hung on the top hardware and then hung on the tension clamp 13 on the other tension insulator 500 on the other side of the pole 20, and the jumper is electrically connected to the wires on both sides of the pole 20.

[0042] Furthermore, the second intermediate connecting portion 132 also includes reinforcing ribs 1326. For example, when the second intermediate connecting portion 132 is a "J"-shaped structure, reinforcing ribs 1326 are provided between the first side plate 1323 and the first end plate 1321. When the second intermediate connecting portion 132 is an L-shaped structure, reinforcing ribs 1326 are provided between the second side plate 1324 and the second top plate 1325, and the reinforcing ribs 1326 are also connected to the second intermediate sleeve 131. The reinforcing ribs 1326 can effectively improve the connection strength between the plates, thereby improving the mechanical strength of the second intermediate hardware 130.

[0043] Combine Figure 1The end fitting 140 includes a connected end sleeve 141 and two hanging parts 142. The end sleeve 141 is a tubular structure with one end closed. Its open end is sleeved on the outer periphery of the end of the first core rod 110, and the cross-sectional shape and size of the end sleeve 141 match the cross-sectional shape of the first core rod 110. The hanging parts 142 are used to hang the conductor. Specifically, the hanging parts 142 hang the conductor through the tension clamp 13. The two hanging parts 142 are arranged on the bottom side of the end sleeve 141 and are symmetrically arranged along the axis of the end sleeve 141. The hanging parts 142 are plate-shaped structures and are provided with a wire clamp connection hole for connecting the tension clamp 13 through a connecting component such as a hanging ring.

[0044] 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.

[0045] The tension insulator 500 can adopt the tension composite insulator structure in the prior art, the tension clamp 13 can adopt the clamp structure in the prior art, and the installation method of the tension insulator 500 and the tension clamp 13 can also be implemented using the prior art, without specific limitation here.

[0046] like Figure 6 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.

[0047] 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.

[0048] 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.

[0049] like Figure 7 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.

[0050] In this embodiment, the pole 20 has a square cross-section, and the pole connection portion 310 is configured as a corresponding plate-shaped structure. This increases the contact area between the pole connection portion 310 and the pole 20, ensuring a secure connection between the two. The pole connection portion 310 includes a first plate 311 having a first pole connection hole 3111 defined therein for securing the first plate 311 to the pole 20 via fasteners such as bolts and screws.

[0051] The crossarm connecting portion 320 includes two second plates 321, one end of the two second plates 321 is respectively connected to the two ends of the first plate 311 vertically, and the two second plates 321 extend in the same direction from the two ends of the first plate 311 in the direction away from the first plate 311, and the distance between the two second plates 321 that are close to each other is slightly larger than the distance between the two second connecting plates 2322 that are away from each other in the second connecting portion 232 of the second hardware 230. On the one hand, the second connecting portion 232 can be moved between the two second plates 321, which is convenient for adjusting the angle between the second crossarm 200 and the pole 20; on the other hand, the two second plates 321 can be clamped and fixed with 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 adjustment hole 3212. The fixing hole 3211 is a circular through hole, and the adjustment hole 3212 is an arc-shaped hole. The arc of the adjustment hole 3212 is concentric with the fixing hole 3211. The two are used to enable the second crossarm 200 to rotate around the fixing hole 3211, which is convenient for adjusting the angle between the second crossarm 200 and the pole 20 and fixing the second crossarm 200 to the connecting hardware 300. The fixing holes 3211 and the adjustment holes 3212 on each second plate 321 are respectively arranged to correspond to the two groups 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, so that the angle between the second crossarm 200 and the pole 20 can be adjusted according to design requirements, and the installation is flexible and the connection is reliable; and the independent hardware structure makes it suitable for installing composite crossarms 10 of different length specifications, and has a wider range of applications.

[0052] In this embodiment, the length of the first plate 311 along the length direction of the pole 20 is smaller than the length of the second plate 321, and the first plate 311 is located at the upper part of the second plate 321, and the fixing hole 3211 and the adjustment hole 3212 are located in the middle part of the second plate 321, that is, the fixing hole 3211 and the adjustment hole 3212 are located below the first pole connection hole 3111, which can prevent the fasteners between the pole connection part 310 and the pole 20 from affecting the rotation adjustment of the angle between the second cross arm 200 and the pole 20, and at the same time can reduce the material consumption of the connecting hardware 300 and reduce the manufacturing cost.

[0053] When installing the connecting fitting 300, first place the first plate 311 of the pole connecting part 310 close to the pole 20, and align the first pole connecting hole 3111 on the first plate 311 with the installation hole on the pole 20, then insert bolts, screws and other fasteners and tighten them to fix the connecting fitting 300 on the pole 20. When installing the second crossarm 200, the second connecting portion 232 is placed between the two second plates 321, and the fixing hole 3211, the adjusting hole 3212 and the fourth connecting hole 23221 of the second connecting portion 232 are aligned, and bolts, screws and other fasteners are inserted into the corresponding fixing hole 3211 and the fourth connecting hole 23221, the adjusting hole 3212 and the fourth connecting hole 23221 for pre-fixing, that is, the approximate position of the two is limited under the premise of not affecting the rotation of the second connecting portion 232 in the crossarm connecting portion 320. At this time, the second crossarm 200 can rotate around the fixing hole 3211 as the center, that is, when the second crossarm 200 rotates, the fasteners in the fixing hole 3211 remain in position unchanged, and the fasteners in the adjusting hole 3212 slide and adjust in the adjusting hole 3212 around the fixing hole 3211 as the center. After the angle between the second crossarm 200 and the pole 20 is adjusted to the preset angle, the above fasteners are tightened to fix the second crossarm 200 to the pole 20. In other embodiments, after the connecting hardware is fixed on the pole, fasteners can be inserted into the corresponding fixing holes and the fourth connecting hole for pre-fixing. When the second cross arm is adjusted into place, the fasteners are tightened, and fasteners are inserted into the corresponding adjustment holes and the fourth connecting hole and tightened to fix the second cross arm to the pole. No specific restrictions are made here.

[0054] Furthermore, in order to make the connection between the connecting fitting 300 and the pole 20 more stable, the pole connecting part 310 also includes a third plate 312, and 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 respectively 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 located at the lower part of the second plate 321, that is, the first plate 311 and the third plate 312 are respectively located on the upper and lower sides of the second plate 321 in the vertical direction. A second pole connecting hole 3121 is provided on the third plate 312, which is used to further fix the connecting fitting 300 to the pole 20 by fasteners such as bolts and screws. The provision of the third plate 312, on the one hand, allows the upper and lower ends of the connecting hardware 300 to be fastened to the electric pole 20 simultaneously through the first plate 311 and the third plate 312, making the force between the two more uniform and the connection more reliable; on the other hand, disposing the third plate 312 at the end of the second plate 321 away from the electric pole 20 can avoid interference between the third plate 312 and the fasteners on the second plate 321 during installation. During installation, first connect the connecting hardware 300 to the electric pole 20 through the first plate 311, then install the second cross arm 200 and adjust it into place, and then insert bolts, screws and other fasteners into the second electric pole connection hole 3121 on the third plate 312 and the installation hole on the electric pole 20 and tighten them, thereby further fixing the connecting hardware 300 to the electric pole 20.

[0055] Furthermore, 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 both flanges 3213 are located in the same plane as the first plate 311. The provision 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.

[0056] like Figure 8As shown, the third crossarm 400 includes a third core rod 410 (labeled for schematic purposes only), a bottom fitting 420, a top fitting 430, and a third insulating layer 440. The bottom fitting 420 connects one end of the third core rod 410 to the middle of the first crossarm 100, while the top fitting 430 connects the other end of the third core rod 410 and is used to hang the wire. The third insulating layer 440 covers at least a portion of the outer circumference of the third core rod 410. The bottom fitting 420 includes a bottom sleeve 421 and a bottom connecting portion 422. One end of the bottom sleeve 421 connects to one end of the third core rod 410. For example, the bottom sleeve 421 can be connected to the third core rod 410 through a crimping process. Because the bottom fitting 420 needs to be fixedly connected to the second intermediate fitting 130 of the first crossarm 100, the bottom connecting portion 422 is provided corresponding to the second intermediate connecting portion 132.

[0057] In one embodiment, combining Figure 5 When the second intermediate connecting portion 132 of the second intermediate fitting 130 comprises two plates, a second connecting hole 13251 is defined in the second top plate 1325. The bottom connecting portion 422 is a bottom plate 422, which is a plate-like structure. A fifth connecting hole 4221 is defined in the bottom plate 422, which is configured to mate with the second connecting hole 13251 to assemble the first crossarm 100 and the third crossarm 400. During installation, the bottom plate 422 is placed snugly against the second top plate 1325, and the second connecting hole 13251 is aligned with the fifth connecting hole 4221. Fasteners such as bolts and screws are then inserted and tightened to connect the second intermediate connecting portion 132 to the bottom plate 422, thereby vertically mounting the third crossarm 400 above the center of the first crossarm 100. In this embodiment, two second connection holes 13251 are set on the second top plate 1325, and two fifth connection holes 4221 are correspondingly set on the bottom plate 422. In other embodiments, more second connection holes can also be set on the second top plate, and a corresponding number of fifth connection holes can be set on the bottom plate. It can be adjusted according to the installation requirements of the third cross arm, and no specific restrictions are made here.

[0058] In another embodiment, combined Figure 1 and Figure 4 When the second intermediate connecting portion 132 of the second intermediate hardware 130 includes five plates, a second connecting hole 13221 is provided on the first top plate 1322, and the bottom connecting portion is directly penetrated through the second connecting hole 13221 on the first top plate 1322 using a threaded structure and is tightened and fixed by a nut. The second intermediate connecting portion 132 can be fixed to the bottom connecting portion, thereby vertically installing the third crossarm 400 above the middle part of the first crossarm 100.

[0059] The top hardware 430 includes a top sleeve 431 and a terminal 432. One end of the top sleeve 431 is connected to the other end of the third core rod 410, and the other end of the top sleeve 431 is connected to the terminal 432. The top sleeve 431 can be connected to the third core rod 410 through a crimping process. The terminal 432 is used to hang the wire. A hanging groove is provided on the top of the terminal 432 for placing the jumper wire; an annular groove is provided on the outer surface of the terminal 432 for assisting in fixing the jumper wire with an insulating rope. In other embodiments, the top hardware can also adopt existing hanging hardware structures such as pressure-capped hardware, groove-type wire clamp-type hardware, plate-type wire clamp-type hardware, etc. commonly used in the industry. As long as the wire can be hung stably, no specific restrictions are made here.

[0060] In one embodiment, the first core rod 110, the second core rod 210 and the third core rod 410 are all 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.

[0061] In one embodiment, the first core rod 110 has a square cross-section, while the second core rod 210 and the third core rod 410 have circular cross-sections. This configuration provides the composite cross-arm 10 with excellent overall structural strength, simplicity, and low cost. In other embodiments, the cross-sections of the first, second, and third core rods may 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 may have different or identical structures, for example, the first core rod may have a triangular cross-section, the second core rod may have a square cross-section, and the third core rod may have a T-shaped cross-section, or the cross-sections of all core rods may be square or circular, etc., without specific limitation.

[0062] In one embodiment, the cross-sectional shape and size of the hardware sleeve on each core rod match the cross-sectional shape of the corresponding core rod, that is, the cross-sectional shape and size of the first intermediate sleeve 121, the second intermediate sleeve 131 and the end sleeve 141 match the cross-sectional shape and size of the first core rod 110, the cross-sectional shape and size of the first sleeve 221 and the second sleeve 231 match the cross-sectional shape and size of the second core rod 210, and the cross-sectional shape and size of the bottom sleeve 421 and the top sleeve 431 match the cross-sectional shape and size of the third core rod 410, 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 hardware and the corresponding core rod.

[0063] In one embodiment, each hardware is formed into a separate hardware component and then connected together by welding, which provides reliable connection and simple manufacturing. In other embodiments, each hardware 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.

[0064] In one embodiment, the first insulating layer 150, the second insulating layer 240 and the third insulating layer 440 all include a sheath. The sheath of the first insulating layer 150 is sealedly connected to the first intermediate hardware 120, the second intermediate hardware 130 in the middle of the first core rod 110 and the end hardware 140 at both ends. The sheath of the second insulating layer 240 is sealedly connected to the first hardware 220 and the second hardware 230 at both ends of the second core rod 210. The sheath of the third insulating layer 440 is sealedly connected to the bottom hardware 420 and the top hardware 430 at both ends of the third core rod 410, which can effectively prevent external water vapor from invading and damaging the first core rod 110, the second core rod 210 and the third core rod 410, thereby avoiding affecting the service life of the composite crossarm 10.

[0065] Furthermore, the first insulating layer 150, the second insulating layer 240 and the third insulating layer 440 may also include umbrella skirts spaced apart on the sheath. The setting of the umbrella skirts can increase the creepage distance of the outer surfaces of the first crossarm 100, the second crossarm 200 and the third crossarm 400, so that the composite crossarm 10 has a sufficient dry arc distance. In addition, the setting of the umbrella skirts can also prevent birds from nesting, thereby improving the overall electrical safety of the composite crossarm 10.

[0066] In one embodiment, the first insulating layer 150, the second insulating layer 240, and the third insulating layer 440 are all made of high-temperature vulcanized silicone rubber. The silicone rubber material is coated around the outer periphery of the first core rod 110, the second core rod 210, and the third core rod 410 through an integral vacuum injection molding process to form an overall high-temperature vulcanized silicone rubber insulation layer. High-temperature vulcanized silicone rubber has excellent aging resistance and hydrophobic migration properties, which can reduce the probability of pollution flashover and rain flashover, thereby improving the electrical safety of the composite crossarm 10. In other embodiments, the first insulating layer, the second insulating layer, and the third insulating layer can also be molded or pre-formed and then sleeved onto the outer periphery of the corresponding core rod, without specific limitation herein.

[0067] It can be understood that the overall length of the composite crossarm 10 of the present application, the lengths of the first crossarm 100, the second crossarm 200 and the third crossarm 400, etc. can be adjusted accordingly as needed; and the installation order of the composite crossarm 10 can also be adjusted accordingly as needed, 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 and the third crossarm 400 can be fixed, or the first crossarm 100, the two second crossarms 200, the connecting hardware 300, and the third crossarm 400 can be assembled first, and then installed on the pole 20 for adjustment and fixation. No specific restrictions are made here.

[0068] The beneficial effect of the present application is that, different from the prior art, the composite crossarm of the present application includes a first crossarm, two second crossarms, connecting hardware, and a third crossarm. Through the fully insulated overall structure of the composite crossarm and the overall raising of the hanging height of the conductor by the second crossarm, 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 is extended, 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 and protect biodiversity.

[0069] 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.

[0070] In addition, compared with traditional iron crossarms, this application uses composite crossarms to directly hang conductors, which can eliminate the suspended insulator structure, making the crossarm structure simpler, more convenient 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.

[0071] The technical content and features of this application have been disclosed above. However, it is understood that, based on the creative ideas of this application, those skilled in the art may make various changes and improvements to the above-mentioned structures and materials, including combinations of the technical features disclosed or claimed herein, and obviously including other combinations of these features. Such variations and / or combinations fall within the technical field involved in this application and fall within the scope of protection of the claims of this application.

Claims

1. A composite cross arm, characterized in that: include: a first cross arm, wherein the length direction of the first cross arm is arranged in the horizontal direction, and both ends of the first cross arm are used for hanging conductors through tension clamps; 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 connected to the two sides of the pole through the two connecting hardware respectively; a third cross arm, one end of the third cross arm being connected to the middle portion of the first cross arm, the other end of the third cross arm being used for hanging a jumper wire, the length direction of the third cross arm being arranged in a vertical direction and being located above the first cross arm; Two tension insulators, one end of each of the two tension insulators is connected to both sides of the middle of the first cross arm respectively, the other end of each of the tension insulators is used to hang the conductor through a tension clamp, and the length direction of the tension insulator is perpendicular to the length direction of the first cross arm.

2. The composite cross arm according to claim 1, characterized in that: The first cross arm comprises: First mandrel; Two first intermediate hardware pieces, the two first intermediate hardware pieces respectively connecting the two second cross arms and two different positions in the middle of the first core rod; a second intermediate hardware fixture, the second intermediate hardware fixture being located between two of the first intermediate hardware fixtures, and the second intermediate hardware fixture connecting the third crossarm, the tension insulator, and the middle portion of the first core rod; Two end fittings, the two end fittings being connected to two ends of the first core rod respectively, and the end fittings being used to hang the conductor through the tension clamp; 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 side 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 second intermediate sleeve, the second intermediate sleeve being sleeved on the middle portion of the first core rod; a second intermediate connecting portion, the second intermediate connecting portion being disposed on a top side of the second intermediate sleeve and being used to connect to the third cross arm; Two insulator connecting parts are arranged on the bottom side of the second intermediate sleeve and are symmetrically arranged along the axis of the second intermediate sleeve. The insulator connecting parts are used to connect the tension insulator.

5. The composite cross arm according to claim 2, characterized in that: The end fitting includes an end sleeve and two hanging parts, the end sleeve is used to connect the end of the first core rod; the two hanging parts are arranged on the bottom side of the end sleeve and are symmetrically arranged along the axis of the end sleeve, and the hanging parts are used to hang the wire through the tension clamp.

6. 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.

7. The composite cross arm according to claim 1, characterized in that: 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.

8. The composite cross arm according to claim 7, characterized in that: 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.

9. The composite cross arm according to claim 8, characterized in that: 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.

10. The composite cross arm according to claim 8, 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 lengths of the first plate and the third plate along the length direction of the pole are less than the length of the second plate, and the first plate and the third plate are respectively located at the upper and lower parts of the second plate.

11. A transmission pole, characterized in that: It comprises an electric pole and the composite cross arm according to any one of claims 1 to 10, wherein the composite cross arm is fixed on the electric pole.

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