Composite cross arm

Abstract

The invention discloses a composite cross arm, which comprises a first cross arm, and the first cross arm comprises a first core rod; the two first middle fittings are respectively connected to two different positions of the middle part of the first core rod; the second middle fitting is connected with the middle part of the first core rod, and the second middle fitting is positioned between the two first middle fittings; the two end hardware fittings are connected with the two ends of the first core rod respectively, and the end hardware fittings are used for hanging wires; and the first insulating layer covers at least part of the peripheral surface of the first core rod. The composite cross arm is simple in structure, convenient to install and low in cost.

Description

Technical Field

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

[0002] Crossarms are components installed on poles in overhead lines, and their main function is to support conductors. Currently, composite crossarms used in transmission lines with voltage levels of 35kV and below mostly use integral crossarms with intermediate hardware. The core rods used in composite crossarms are full-length structures. Some composite crossarms have holes in the middle of the core rods for inserting pole body connection clamps; some core rods are not punched, so the intermediate hardware used is more complex and bulky, resulting in an increase in the overall weight of the crossarm, and the need for double clamps to fix it, which is more complicated to install, resulting in a complex crossarm structure and high cost. Summary of the invention

[0003] In view of the deficiencies in the prior art, the purpose of the present application is to provide a composite cross arm with a simple structure, easy installation and low cost.

[0004] To achieve the above-mentioned purpose, the technical solution adopted in the present application is: a composite crossarm, including a first crossarm, the first crossarm including: a first core rod; two first intermediate hardware, the two first intermediate hardware are respectively connected to two different positions in the middle of the first core rod; a second intermediate hardware, the second intermediate hardware is connected to the middle of the first core rod, and the second intermediate hardware is located between the two first intermediate hardware; two end hardware, the two end hardware are respectively connected to the two ends of the first core rod, and the end hardware is used to hang the wire; a first insulating layer, the first insulating layer covers at least a portion of the outer circumference of the first core rod.

[0005] 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.

[0006] Wherein, 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 is used to connect the third cross arm.

[0007] The second intermediate connecting portion is formed by a plurality of plates connected to each other, and at least one of the plurality of plates is arranged in a horizontal direction for installing a third cross arm.

[0008] Among them, several plates include two first end plates, two first side plates, and a first top plate. The two first end plates are connected to the middle of the top side of the second intermediate sleeve at intervals in the horizontal direction. The two first side plates are arranged between the two first end plates and are symmetrically arranged in the vertical direction. The first top plate is arranged in the horizontal direction and is respectively connected to the two first side plates.

[0009] Among them, the plurality of plates include a second side plate and a second top plate, the second side plate and the second top plate are vertically connected, the second side plate is vertically connected to the middle of the top side of the second intermediate sleeve, and the second top plate is arranged in the horizontal direction.

[0010] The end fitting comprises a connected end sleeve and a hanging portion, the end sleeve is used to connect the end of the first core rod, and the hanging portion is used to hang the wire.

[0011] Among them, the hanging part includes a base, a pressure cover and two ear pieces. The base covers the end of the end sleeve that is not connected to the first core rod. A first groove is arranged on the base for placing the wire; a second groove is arranged at the bottom of the pressure cover for auxiliary fixing of the wire; the two ear pieces are respectively connected to both sides of the pressure cover for matching and connecting with the base so that the pressure cover can press and fix the wire.

[0012] Among them, the hanging part is a groove structure, the groove structure covers the end of the end sleeve that is not connected to the first core rod, the groove structure is a U-shaped groove, the notch of the U-shaped groove is set upward, and the U-shaped groove is used to install a support wire clamp to hang the wire.

[0013] Among them, the hanging part includes an end plate and a wire hanging plate which are vertically connected. The end plate covers the end of the end sleeve which is not connected to the first core rod. The wire hanging plate extends vertically outward from the side of the end plate away from the end sleeve. The wire hanging plate is provided with a mounting hole for installing a suspension wire clamp to hang the wire.

[0014] The beneficial effect of the present application is that, different from the prior art, the composite crossarm of the present application includes a first intermediate hardware and a second intermediate hardware, the first intermediate hardware is used to connect to the pole, and the second intermediate hardware is used to carry the conductor, which simplifies the structure of the hardware and makes the composite crossarm bear balanced force.

[0015] At the same time, the composite crossarm of the present application is directly connected to the conductor, 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of a transmission pole 1000 according to an embodiment of the present application;

[0017] Figure 2 is a schematic structural diagram of a first cross arm 100 according to an embodiment of the present application;

[0018] Figure 3 yes Figure 2 The enlarged schematic diagram of point A in the middle;

[0019] Figure 4 yes Figure 2 The enlarged schematic diagram of point B in the middle;

[0020] Figure 5 is a structural schematic diagram of a second intermediate hardware 130 according to another embodiment of the present application;

[0021] Figure 6 It is a schematic diagram of the wire hanging structure of the end fitting 140 according to an embodiment of the present application;

[0022] Figure 7 is a structural schematic diagram of an end fitting 140 according to another embodiment of the present application;

[0023] Figure 8 is a structural schematic diagram of an end fitting 140 according to another embodiment of the present application;

[0024] Fig. 9 is a schematic structural diagram of a second cross arm 200 according to an embodiment of the present application;

[0025] Fig.10 It is a structural schematic diagram of a connection fitting 300 according to an embodiment of the present application;

[0026] Fig.11 is a structural schematic diagram of a third cross arm 400 according to an embodiment of the present application;

[0027] Fig.12 It is a schematic structural diagram of a transmission pole 2000 according to another embodiment of the present application. DETAILED DESCRIPTION

[0028] Upon request, specific embodiments of the present application will be disclosed herein. However, it should be understood that the embodiments disclosed herein are merely typical examples of the present application, which may be embodied in various forms. Therefore, the specific details disclosed herein are not considered to be restrictive, but only as a basis for the claims and as a representative basis for teaching those skilled in the art to apply the present application in various ways in practice in any appropriate manner, including using the various features disclosed herein and combining features that may not be explicitly disclosed herein.

[0029] The "connection" described in this application should be understood in a broad sense, unless otherwise clearly specified or limited, and can be directly connected or connected through an intermediate medium. In the description of this application, it should be understood that the orientation or position relationship indicated by "upper", "lower", "end", "one end", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0030] In an application scenario, such as Figure 1 As shown, the present application provides a transmission pole 1000, which is a straight pole, comprising a composite cross arm 10 and a pole 20, wherein the composite cross arm 10 is fixed on the pole 20. In a power system, a straight pole refers to a pole tower used to support a conductor in the middle of a line.

[0031] The composite crossarm 10 includes a first crossarm 100, two second crossarms 200, two connecting hardware 300 and a third crossarm 400. 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 hang the wires; one end of the two second crossarms 200 is respectively connected to the middle of the first crossarm 100, and the other end of the second crossarm 200 is used to connect the pole 20. The length direction of the second crossarm 200 and the length direction 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 the two second crossarms 200 are respectively connected to the two sides of the pole 20 through two connecting hardware 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 the wires. The length direction of the third crossarm 400 is arranged in the vertical direction and is located above the first crossarm 100. The second cross arm 200 is tilted in the length direction, which can raise the overall hanging height of the wire, reduce the size of each cross arm while meeting the insulation distance, and save costs. Of course, the second cross arm can also be set vertically, and the length of the third cross arm can be increased to meet the insulation distance requirement.

[0032] The transmission pole 1000 of the present application adopts a composite cross arm 10 to hang the conductor. The composite cross arm 10 adopts a fully insulated structure as a whole and the hanging height of the conductor is raised by the second cross arm 200 as a whole, which prolongs 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, so that the birds will not form an electric circuit no matter where they take off, stand or land on the transmission pole 1000, effectively preventing accidents such as tripping caused by electric shock to birds, with higher safety and lower operation and maintenance costs. At the same time, it can effectively reduce the probability of birds landing on the transmission pole 1000 and being electrocuted to death, thereby protecting biodiversity. In the traditional solution, the straight pole supports the conductor by setting a suspended insulator on the iron cross arm. Compared with the traditional iron cross arm, the composite cross arm 10 used in the present application to directly hang the conductor can eliminate the suspended insulator structure, making the cross arm structure simpler, more convenient to install, less prone to rust, and longer service life.

[0033] It should be noted that the middle part written in this application, unless otherwise specified, refers to the part between the two ends, not strictly the central part.

[0034] Combination Figure 2-Figure 4As shown, the first cross arm 100 includes a first core rod 110 (the marks in the figure are for illustration 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 wire; the first insulating layer 150 covers at least a portion of the outer circumference of the first core rod 110.

[0035] 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 by 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.

[0036] 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 as to sleeve and fix the first intermediate sleeve 121 on the outer periphery of the first core rod 110 and increase the contact area between the two, thereby ensuring the connection strength between the first intermediate sleeve 121 and the first core rod 110.

[0037] 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, thereby avoiding the occurrence of electrical safety hazards. In this embodiment, the plate surface direction of the first intermediate connecting part 122 is arranged along the axial direction of the first intermediate sleeve 121, and the through direction of the first connecting hole 1221 is perpendicular to the axial direction of the first intermediate sleeve 121, 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 is convenient for 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 limitation is made here.

[0038] 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 in the middle of the first mandrel 110. Specifically, the second intermediate sleeve 131 is sleeved on the outer periphery of the first mandrel 110 and fixed on the first mandrel 110 by a crimping process. The second intermediate connecting portion 132 is arranged on the top side of the second intermediate sleeve 131, and the second intermediate connecting portion 132 is used to connect the third cross arm 400. Preferably, the second intermediate sleeve 131 is sleeved in the middle position of the outer periphery of the first mandrel 110, and the first intermediate sleeves 121 of the two first intermediate fittings 120 are symmetrically arranged on both sides of the second intermediate sleeve 131, so that the first cross arm 100 is a symmetrical structure as a whole, the force is more balanced, and the structure is more stable.

[0039] The second intermediate connecting portion 132 is formed by connecting a plurality of plates, at least one of which is arranged in a horizontal direction 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 herein.

[0040] In one embodiment, if Figure 4 As shown, the plurality of plates of the second intermediate connecting portion 132 include five plates, which are connected in sequence so that the second intermediate connecting portion 132 presents 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 a 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 plates 1323 are arranged in the vertical direction or are arranged obliquely relative to the vertical direction, one end of the two first side plates 1323 is connected to the two first end plates 1321 respectively, and the other ends of the two first side plates 1323 are connected to the two ends of the first top plate 1322 respectively, and the first top plate 1322 is arranged in the horizontal direction. At least one second connection hole 13221 is provided on the first top plate 1322, 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 punch holes on the second intermediate sleeve 131 and the first core rod 110 for connection, so as to avoid the impact of punching on the mechanical properties of the core rod 110, thereby avoiding the potential safety hazards of electricity. A gap is left between the first top plate 1322 and the top side of the second intermediate sleeve 131 to form an installable space, which is convenient for construction personnel to operate to tighten fasteners such as bolts and screws.

[0041] 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, wherein 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 affecting the mechanical properties of the core rod 110 through drilling holes, thereby avoiding electrical safety hazards.

[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. 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] Combination Figure 2 , Figure 6-Figure 8 As shown, the end fitting 140 includes a connected end sleeve 141 and a hanging portion 142, the end sleeve 141 is used to connect the end of the first core rod 110, and the hanging portion 142 is used to directly hang the wire or to hang the wire through a wire clamp.

[0044] In one embodiment, if Figure 6As shown, the end fitting 140 is a gland type fitting, which can directly hang the wire. The end fitting 140 includes a connected end sleeve 141 and a hanging part 142. The end sleeve 141 is sleeved on the outer periphery of the end of the first core rod 110. The end sleeve 141 is a tubular structure with one end closed, 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 part 142 includes a base 1421, a gland 1422 and two ears 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 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 gland 1422; the bottom of the gland 1422 is provided with a second groove 14221, which is also an arc groove for auxiliary fixing of the wire. The first groove 14211 and the second groove 14222 are provided with a second groove 14221. 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 ear pieces 1423 are respectively connected to the two sides of the gland 1422, and the two ear pieces 1423 are located on the axial sides of the second slot 14221, and the ear pieces 1423 are provided with mounting holes, and the mounting holes on the two ear pieces 1423 are arranged correspondingly with the mounting holes on the base 1421, so that the ear pieces 1423 can be fastened to the base 1421 through fasteners such as bolts and screws, so that the gland 1422 can press and fix the wire. When installing the wire, place the wire in the first slot 14211, place the gland 1422 above the wire, make the second slot 14221 fit the top of the wire and press the wire, and then pass the fasteners through the ear pieces 1423 and the mounting holes on the base 1421 and tighten them, so that the gland 1422 is fixedly connected to the base 1421, so that the wire is firmly hung on the end fitting 140.

[0045] Furthermore, a hoisting portion 143 is provided at the bottom of the 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 conductor is smaller than the width of the end sleeve 141, which can reduce the weight of the end hardware 140 while ensuring the wire hanging effect, thereby reducing the cost.

[0046] In another embodiment, Figure 7As shown, the end fitting 140 is a slot-type wire clamp fitting, and the wire can be hung through the support wire clamp 11. The end fitting 140 includes a connected end sleeve 141 and a hanging portion 142. The structure of the end sleeve 141 is as described above and will not be repeated here; the hanging portion 142 is a slot structure, which covers the end of the end sleeve 141 that is not connected to the first core rod 110, and the slot structure is a U-shaped slot, the slot of the U-shaped slot is set upward, and the two side walls of the U-shaped slot are correspondingly provided with mounting holes, which are used to install the support wire clamp 11 through fasteners such as bolts and screws to hang the wire. The support wire clamp 11 includes a wire clamp base and a wire clamp cover. The wire clamp base is provided with an arc groove for placing the wire, and the bottom of the wire clamp cover is correspondingly provided with an arc groove for assisting in fixing the wire; mounting holes are correspondingly provided on both sides of the arc groove on the wire clamp base and the wire clamp cover, which are used to press and fix the wire between the wire clamp base and the wire clamp cover through fasteners such as bolts and screws; mounting holes are also provided at both ends of the wire clamp base for fixed connection with the two side walls of the U-shaped groove. When installing the wire, first fix the wire on the support wire clamp 11, that is, place the wire in the arc groove of the wire clamp base, and press and fix the wire clamp cover on the wire clamp base, then place the support wire clamp 11 in the groove structure of the end hardware 140, and align the mounting holes at both ends of the wire clamp base with the mounting holes on the two side walls of the U-shaped groove, and then insert fasteners to fix the support wire clamp 11 in the groove structure, so that the wire is firmly hung on the end hardware 140. A hanging part 143 is provided at the bottom of the hanging part 142. The structure and purpose of the hanging part 143 are as described above and will not be described in detail. The supporting wire clamp 11 adopts a wire clamp structure in the prior art and is not specifically limited here.

[0047] In another embodiment, Figure 8 As shown, the end fitting 140 is a plate-type wire clamp fitting, and the wire can be hung through the suspension wire clamp 12. The end fitting 140 includes a connected end sleeve 141 and a hanging portion 142. The structure of the end sleeve 141 is as described above and will not be repeated here; the 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 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 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 wire 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 wire clamp 12 adopts the wire clamp structure in the prior art, and no specific restrictions are made here.

[0048] In other implementations, the end fittings may also adopt existing fitting structures, as long as they can be used to hang the wires, and no specific limitation is made here.

[0049] like Fig. 9 As shown, the second cross arm 200 includes a second core rod 210 (the marks in the figure are for schematic representation 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; and the second insulating layer 240 covers at least a portion of the outer circumference of the second core rod 210.

[0050] The first hardware 220 includes a first sleeve 221 and a first connecting portion 222 connected to each other. One end of the first sleeve 221 is connected to one end of the second mandrel 210. For example, the first sleeve 221 can be connected to the second mandrel 210 by a crimping process. The first connecting portion 222 is used to connect the middle of the first cross arm 100. The first connecting portion 222 is a plate-like structure. The first connecting portion 222 is provided with a third connecting hole 2221, which is used to match and connect with the first connecting hole 1221 on the first intermediate connecting portion 122 to achieve the assembly of the first cross arm 100 and the second cross arm 200. During installation, the first connecting portion 222 is closely arranged with the first intermediate connecting portion 122, and the third connecting hole 2221 is aligned with the first connecting hole 1221, and then a fastener such as a bolt or a screw is inserted and tightened to connect the first connecting portion 222 with the first intermediate connecting portion 122, so that one end of the second cross arm 200 is connected to the middle of the first cross arm 100.

[0051] The second fitting 230 includes a connected second sleeve 231 and a second connecting portion 232. One end of the second sleeve 231 is connected to the other end of the second mandrel 210. For example, the second sleeve 231 can be connected to the second mandrel 210 through a crimping process. The second connecting portion 232 is used to connect to the connecting fitting 300, and further connect the second cross arm 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 mandrel 210. The two second connecting plates 2322 are respectively vertically connected to both ends of the first connecting plate 2321, and the two second connecting plates 2322 extend in the same direction away from the second sleeve 231 from both ends of the first connecting plate 2321, so that the second connecting portion 232 has a "C"-shaped structure. Two groups of fourth connection holes 23221 are provided on each second connecting plate 2322, and the fourth connection holes 23221 on the two second connecting plates 2322 are correspondingly arranged for mating connection with the connecting fitting 300 through fasteners such as bolts and screws. That is, there is no need to drill holes in the second sleeve 231 and the second mandrel 210 for connection, avoiding the influence of drilling on the mechanical properties of the second mandrel 210, and further avoiding potential electrical safety hazards.

[0052] As Fig.10 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, and the angle between the second cross arm 200 and the pole 20 can be adjusted.

[0053] In this embodiment, the cross section of the pole 20 is square, and the pole connecting portion 310 is correspondingly arranged as a plate-like structure, which can increase the contact area between the pole connecting portion 310 and the pole 20 and ensure reliable connection between the two. The pole connecting portion 310 includes a first plate member 311, and a first pole connection hole 3111 is provided on the first plate member 311 for making the first plate member 311 abut and be fixed on the pole 20 through fasteners such as bolts and screws.

[0054] The crossarm connecting portion 320 includes two second plates 321, one end of the two second plates 321 is respectively vertically connected to the two ends of the first plate 311, and the two second plates 321 extend in the same direction from the two ends of the first plate 311 to the direction away from the first plate 311. The distance between the mutually close plate surfaces of the two second plates 321 is slightly larger than the distance between the mutually distant plate surfaces of the two second connecting plates 2322 of 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 to facilitate the adjustment of 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 to ensure a reliable connection between the second crossarm 200 and the pole 20. The second plate 321 is provided with a fixing hole 3211 and an adjusting hole 3212. The fixing hole 3211 is a circular through hole, and the adjusting hole 3212 is an arc hole. The arc of the adjusting hole 3212 is concentric with the fixing hole 3211. The two are used to enable the second cross arm 200 to rotate around the fixing hole 3211, so as to adjust the angle between the second cross arm 200 and the pole 20 and fix the second cross arm 200 to the connecting hardware 300. The fixing holes 3211 and the adjustment holes 3212 on each second plate 321 are respectively arranged corresponding 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 the application range is wider.

[0055] 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 connecting hole 3111, which can prevent the fasteners between the pole connecting part 310 and the pole 20 from affecting the rotation adjustment of the angle between the second 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.

[0056] When installing the connecting fitting 300, firstly, the first plate 311 of the pole connecting part 310 is placed close to the pole 20, and the first pole connecting hole 3111 on the first plate 311 is aligned with the installation hole on the pole 20, and then bolts, screws and other fasteners are inserted and tightened to fix the connecting fitting 300 on the pole 20. When installing the second cross arm 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-fixation, that is, the approximate positions of the two are limited without affecting the rotation of the second connecting portion 232 in the cross arm connecting portion 320. At this time, the second cross arm 200 can rotate around the fixing hole 3211, that is, when the second cross arm 200 rotates, the fasteners in the fixing hole 3211 keep their positions unchanged, and the fasteners in the adjusting hole 3212 slide and adjust in the adjusting hole 3212 around the fixing hole 3211. After adjusting the angle between the second cross arm 200 and the pole 20 to the preset angle, the above fasteners are tightened to fix the second cross arm 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 holes for pre-fixing. When the second crossarm is adjusted into place, the fasteners are tightened, and fasteners are inserted into the corresponding adjustment holes and the fourth connecting holes and tightened to fix the second crossarm to the pole. No specific restrictions are made here.

[0057] 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, and a second pole connecting hole 3121 is provided on the third plate 312, which is used to further fix the connecting fitting 300 on the pole 20 by fasteners such as bolts and screws. The third plate 312 is provided so that, on the one hand, the upper and lower ends of the connection fitting 300 can be fastened to the pole 20 simultaneously through the first plate 311 and the third plate 312, so that the force between the two is more uniform and the connection is more reliable; on the other hand, the third plate 312 is provided at the end of the second plate 321 away from the pole 20, so that the third plate 312 can be prevented from interfering with the fasteners on the second plate 321 during installation. During installation, the connection fitting 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 through the second pole connection hole 3121 on the third plate 312 and the installation hole on the pole 20 and fastened, so as to further fix the connection fitting 300 to the pole 20.

[0058] 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.

[0059] like Fig.11As shown, the third cross arm 400 includes a third core rod 410 (the marks in the figure are for illustration 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 and the middle part of the first cross arm 100, and the top fitting 430 connects the other end of the third core rod 410 for hanging the wire; the third insulating layer 440 covers at least part 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 connected to each other. One end of the bottom sleeve 421 is connected to one end of the third core rod 410. For example, the bottom sleeve 421 can be connected to the third core rod 410 by a crimping process; since the bottom fitting 420 needs to be fixedly connected to the second intermediate fitting 130 of the first cross arm 100, the bottom connecting portion 422 is correspondingly arranged to the second intermediate connecting portion 132.

[0060] In one embodiment, in combination Figure 5 When the second intermediate connection part 132 of the second intermediate hardware 130 includes two plates, the second top plate 1325 is provided with a second connection hole 13251, the bottom connection part 422 is a bottom plate 422, the bottom plate 422 is a plate-like structure, and the bottom plate 422 is provided with a fifth connection hole 4221, which is used to match and connect with the second connection hole 13251 to achieve the assembly of the first cross arm 100 and the third cross arm 400. During installation, the bottom plate 422 is closely arranged with the second top plate 1325, and the second connection hole 13251 is aligned with the fifth connection hole 4221, and then bolts, screws and other fasteners are inserted and tightened to connect the second intermediate connection part 132 with the bottom plate 422, so that the third cross arm 400 is vertically installed above the middle of the first cross arm 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 may be set on the second top plate, and a corresponding number of fifth connection holes may be set on the bottom plate. It can be adjusted according to the installation requirements of the third cross arm, and no specific limitation is made here.

[0061] In another embodiment, in combination Figure 1 and Figure 4 When the second intermediate connection part 132 of the second intermediate hardware 130 includes five plates, a second connection hole 13221 is provided on the first top plate 1322, and the bottom connection part 422 is directly penetrated through the second connection hole 13221 on the first top plate 1322 by a threaded structure, and is tightened and fixed by a nut, so that the second intermediate connection part 132 and the bottom connection part 422 can be fixed, so that the third cross arm 400 is vertically installed above the middle part of the first cross arm 100.

[0062] The top fitting 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, and the terminal 432 is used to hang the wire. A wire hanging groove is provided on the top of the terminal 432 for placing the wire; an annular groove is provided on the outer surface of the terminal 432 for assisting in fixing the wire with an insulating rope. In other embodiments, the top fitting may also adopt a structure similar to the aforementioned gland-type fitting, groove-type wire clamp-type fitting, and plate-type wire clamp-type fitting, which will not be described in detail; or an existing wire hanging fitting structure may also be adopted, as long as the wire can be hung stably, and no specific limitation is made here.

[0063] 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, for example, glass fiber or aramid fiber impregnated with epoxy resin and then pultruded. Compared with the metal material of traditional crossarms, the composite material is more corrosion-resistant and low-cost, and can achieve significant weight reduction, making the composite crossarm 10 easy to install.

[0064] In one embodiment, the cross section of the first core rod 110 is square, and the cross sections of the second core rod 210 and the third core rod 410 are circular, so that the composite cross arm 10 has good overall structural strength, simple structure and low cost. In other embodiments, the cross sections of the first core rod, the second core rod and the third core rod may also be triangular, T-shaped, L-shaped, etc., as long as the structure of each core rod meets the strength requirements; each core rod may have a different structure or the same structure, for example, the cross section of the first core rod is triangular, the cross section of the second core rod is square, the cross section of the third core rod is T-shaped, or the cross sections of each core rod are square or circular, etc., and no specific limitation is made here.

[0065] 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 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 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 of the third core rod 410, so as to fix each sleeve on the corresponding core rod, and to 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.

[0066] In one embodiment, each hardware is formed into a separate hardware component and then connected together by welding, which has reliable connection and simple manufacturing. In other embodiments, each hardware can also be integrally formed by casting or the like, as long as the connection strength between the components can be guaranteed, and no specific limitation is made here.

[0067] 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.

[0068] 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.

[0069] In one embodiment, the first insulating layer 150, the second insulating layer 240 and the third insulating layer 440 are all high temperature vulcanized silicone rubber, and the silicone rubber material is coated on the outer periphery of the first core rod 110, the second core rod 210 and the third core rod 410 by an overall vacuum injection molding process to form an overall high temperature vulcanized silicone rubber insulating layer, and the high temperature vulcanized silicone rubber has good aging resistance and hydrophobic migration, which can reduce the probability of pollution flashover and rain flashover, and improve the electrical safety of the composite cross arm 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 on the outer periphery of the corresponding core rod, and no specific limitation is made here.

[0070] 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, 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, 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, and no specific restrictions are made here.

[0071] In other embodiments, the composite cross arm may also be directly connected to the pole through the second intermediate hardware. Specifically, a clamp structure may be used to cooperate with the second intermediate hardware and be fixed to the pole.

[0072] In another application scenario, Fig.12 As shown, the present application also provides a transmission pole 2000, which is a tension pole, and the tension pole includes a composite cross arm 30 and a pole 40, and the composite cross arm 30 is fixed on the pole 40. In the power system, the tension pole refers to a pole tower used to segment the circuit in the middle of the line to control the range of pole collapse and line breakage. The tension pole is provided with tension insulators and tension clamps on the cross arm to hang the conductor.

[0073] The composite crossarm 30 includes a first crossarm 500, two second crossarms 200, two connecting fittings 300, a third crossarm 400 and two tension insulators 600. 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 500 are used to connect to the tension clamp 13 to hang the conductor; one end of the two tension insulators 600 is respectively connected to both sides of the middle of the first crossarm 500, and the other end of the tension insulator 600 is used to connect to the tension clamp 13 to hang the conductor, and the length direction of the tension insulator 600 is perpendicular to the length direction of the first crossarm 500.

[0074] Specifically, the second intermediate hardware 530 of the first cross arm 500 also includes two insulator connecting parts 533, which are arranged on the bottom side of the second intermediate sleeve and symmetrically arranged along the axis of the second intermediate sleeve. The insulator connecting parts 533 are used to connect the tension insulator 600; the insulator connecting parts 533 are plate-like structures, and the insulator connecting parts 533 are provided with insulator connecting holes, which are used to connect the tension insulator 600 through connecting components such as hanging rings. The top hardware of the third cross arm 400 is used to hang a jumper. Specifically, the wire hung on one of the tension insulators 600 leads out the jumper from the tension clamp 13, and the jumper is first hung on the top hardware and then hung on the tension clamp 13 on another tension insulator 600 on the other side of the pole 40, and the jumper is electrically connected to the wires on both sides of the pole 40.

[0075] The end fitting 540 includes an end sleeve 541 and two hanging parts 542. The hanging parts 542 are specifically used to hang the wire through the tension clamp 13. The two hanging parts 542 are arranged on the bottom side of the end sleeve 541 and are symmetrically arranged along the axis of the end sleeve 541. The hanging part 542 is a plate-like structure. A wire clamp connecting hole is provided on the hanging part 542, which is used to connect the tension clamp 13 through a connecting component such as a hanging ring.

[0076] The tension insulator 600 may adopt the tension composite insulator structure in the prior art, the tension clamp 13 may adopt the clamp structure in the prior art, and the installation method of the tension insulator 600 and the tension clamp 13 may also be implemented using the prior art, without specific limitation herein.

[0077] The beneficial effect of the present application is as follows: 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 probability of birds being electrocuted to death and protect biodiversity.

[0078] At the same time, the present 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. The independent hardware structure makes it suitable for installing composite crossarms of different lengths and specifications, which has a wider range of applications.

[0079] In addition, compared with traditional iron crossarms, the present application uses a composite crossarm to directly hang the conductors, which 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.

[0080] The technical content and technical features of the present application have been disclosed above. However, it is understood that, under the creative concept of the present application, those skilled in the art can make various changes and improvements to the above structures and materials, including combinations of technical features disclosed or claimed separately herein, and obviously including other combinations of these features. These variations and / or combinations all fall within the technical field involved in the present application and fall within the protection scope of the claims of the present application.

Claims

1. A composite cross arm, characterized in that: The composite cross arm comprises a first cross arm, wherein the first cross arm comprises: First mandrel; Two first intermediate hardwares, the two first intermediate hardwares are respectively connected to two different positions in the middle of the first core rod; A second intermediate hardware, the second intermediate hardware connected to the middle of the first core rod, and the second intermediate hardware is located between two of the first intermediate hardware; Two end fittings, the two end fittings are respectively connected to two ends of the first core rod, and the end fittings are used to hang the wire; A first insulating layer covers at least a portion of an outer circumference of the first core rod.

2. The composite cross arm according to claim 1, characterized in that: The first intermediate hardware comprises: a first intermediate sleeve, which is sleeved on the middle part of the first core rod; A first intermediate connecting portion, wherein the first intermediate connecting portion is disposed on the bottom side of the first intermediate sleeve, and the first intermediate connecting portion is used to connect the second cross arm.

3. The composite cross arm according to claim 1, characterized in that: The second intermediate hardware comprises: a second intermediate sleeve, the second intermediate sleeve being sleeved on the middle part of the first core rod; A second intermediate connecting portion, wherein the second intermediate connecting portion is arranged on the top side of the second intermediate sleeve, and the second intermediate connecting portion is used to connect the third cross arm.

4. The composite cross arm according to claim 3, characterized in that: The second intermediate connecting portion is formed by connecting a plurality of plates to each other, and at least one of the plurality of plates is arranged in a horizontal direction for mounting the third cross arm.

5. The composite cross arm according to claim 4, characterized in that: The plurality of plates include two first end plates, two first side plates, and a first top plate. The two first end plates are connected at intervals in the horizontal direction at the middle of the top side of the second intermediate sleeve. The two first side plates are arranged between the two first end plates and are symmetrically arranged in the vertical direction. The first top plate is arranged in the horizontal direction and respectively connects the two first side plates.

6. The composite cross arm according to claim 4, characterized in that: The plurality of plates include a second side plate and a second top plate, the second side plate and the second top plate are vertically connected, the second side plate is vertically connected to the middle of the top side of the second intermediate sleeve, and the second top plate is arranged in the horizontal direction.

7. The composite cross arm according to claim 1, characterized in that: The end fitting comprises a connected end sleeve and a hanging portion, wherein the end sleeve is used to connect the end of the first core rod, and the hanging portion is used to hang the wire.

8. The composite cross arm according to claim 7, characterized in that: The hanging part includes a base, a pressure cover and two ear pieces. The base covers the end of the end sleeve that is not connected to the first core rod. The base is provided with a first groove for placing the wire; the bottom of the pressure cover is provided with a second groove for auxiliary fixing of the wire; the two ear pieces are respectively connected to both sides of the pressure cover for matching and connecting with the base so that the pressure cover can press and fix the wire.

9. The composite cross arm according to claim 7, characterized in that: The hanging part is a groove structure, which covers the end of the end sleeve that is not connected to the first core rod. The groove structure is a U-shaped groove, and the notch of the U-shaped groove is set upward. The U-shaped groove is used to install a support wire clamp to hang the wire.

10. The composite cross arm according to claim 7, characterized in that: The hanging part includes an end plate and a wire hanging plate which are vertically connected. The end plate covers the end of the end sleeve which is not connected to the first core rod. The wire hanging plate extends vertically outward from a side of the end plate away from the end sleeve. The wire hanging plate is provided with a mounting hole for installing a suspension wire clamp to hang the wire.

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