Composite cross arm and power transmission pole

Abstract

The utility model discloses a composite cross arm which comprises a first cross arm, the length direction of the first cross arm is arranged in the horizontal direction, and the two ends of the first cross arm are used for hanging wires; one end of each second cross arm is connected to the middle of the first cross arm, the other end of each second cross arm is used for being connected with an electric pole, the second cross arms are obliquely arranged in the length direction, the second cross arms are arranged below the first cross arms, and the second cross arms and the first cross arms are located in the same vertical plane; 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 wire, the length direction of the third cross arm is arranged in the vertical direction, and the third cross arm is located above 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, in particular to a composite cross arm and a power transmission pole. BACKGROUND

[0002] The cross arm is a component installed on the electric pole in the overhead line, which mainly supports the conductor. The traditional power transmission pole adopts an iron cross arm, and the conductor is hung by installing insulators on the iron cross arm. When the conductor is a bare conductor, birds taking off or landing from the power transmission pole may simultaneously contact any two conductors or any one conductor and the iron cross arm, forming a closed circuit to cause electric shock, which will directly affect the normal operation of the power infrastructure, leading to tripping accidents and causing bird deaths and reducing biodiversity.

[0003] At present, an insulating sheath is usually installed on the outer periphery of the bare conductor near the electric pole to protect birds from electric shock, but this protection method is expensive and has poor long-term use effect, and needs to be replaced and maintained regularly, which has high operation and maintenance cost. CONTENT OF THE UTILITY MODEL

[0004] In view of the deficiencies of the prior art, one of the purposes of the present application is to provide a composite cross arm, which adopts a full insulation structure and raises the hanging height of the conductor by the second cross arm, so as to effectively prevent tripping accidents caused by electric shock of birds, and has higher safety and lower operation and maintenance cost.

[0005] To achieve the above-mentioned purposes, the technical scheme adopted by the present application is: a composite cross arm, comprising: a first cross arm, the length direction of the first cross arm is arranged along the horizontal direction, and both ends of the first cross arm are used for hanging the conductor; two second cross arms, one end of each of the two second cross arms is connected to the middle part of the first cross arm, and the other end of each of the second cross arms is used for connecting the electric pole, the length direction of the second cross arm is arranged obliquely, and the second cross arm is arranged below the first cross arm and in the same vertical plane as the first cross arm; two connecting fittings, the other end of each of the two second cross arms is connected to the two sides of the electric pole through the two connecting fittings; and a third cross arm, one end of the third cross arm is connected to the middle part of the first cross arm, and the other end of the third cross arm is used for hanging the conductor, and the length direction of the third cross arm is arranged along the vertical direction and above the first cross arm.

[0006] Among them, the first cross arm comprises: a first core rod; two first intermediate fittings, the two first intermediate fittings are respectively connected to two different positions of the middle part of the first core rod and the two second cross arms; a second intermediate fitting, the second intermediate fitting is located between the two first intermediate fittings, and the second intermediate fitting connects the middle part of the first core rod and the third cross arm; two end fittings, the two end fittings are respectively connected to the two ends of the first core rod, and the end fittings are used for hanging the conductor; and a first insulation layer, the first insulation layer covers at least part of the outer peripheral surface of the first core rod.

[0007] The first intermediate fitting comprises a first intermediate sleeve, which is sleeved on the middle part of the first core rod; and a first intermediate connecting part, which is arranged on the bottom side of the first intermediate sleeve and is used for connecting the second cross arm.

[0008] The second intermediate fitting comprises a second intermediate sleeve, which is sleeved on the middle part of the first core rod; and a second intermediate connecting part, which is arranged on the top side of the second intermediate sleeve and is used for connecting the third cross arm.

[0009] The end fitting comprises a connected end sleeve and a hanging part, the end sleeve is used for connecting the end part of the first core rod, and the hanging part is used for directly hanging the conductor or is used for hanging the conductor through a wire clamp.

[0010] The second cross arm comprises a second core rod, a first fitting, which connects one end of the second core rod and the middle part of the first cross arm, a second fitting, which connects the other end of the second core rod and the connecting fitting, and a second insulating layer, which covers at least part of the outer circumferential surface of the second core rod.

[0011] The connecting fitting comprises a pole connecting part and a cross arm connecting part, the pole connecting part is connected with the pole, the cross arm connecting part is connected with the other end of the second cross arm, and the angle between the second cross arm and the pole is adjustable.

[0012] The pole connecting part comprises a first plate, which is abutted and fixed on the pole; the cross arm connecting part comprises two second plates, which are respectively connected with the two ends of the first plate perpendicularly, and the two second plates extend in the same direction from the two ends of the first plate to the direction away from the first plate, the second plate is provided with a fixing hole and an adjusting hole, and the fixing hole and the adjusting hole are matched to adjust the angle between the second cross arm and the pole.

[0013] The fixing hole is a circular through hole, the adjusting hole is an arc-shaped hole, and the circular arc of the adjusting hole is concentrically arranged with the fixing hole.

[0014] The pole connecting part further comprises a third plate, which is used for matching connection with the pole, the two ends of the third plate are respectively connected with the other ends of the two second plates which are not connected with 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 at the upper part and the lower part of the second plate.

[0015] The second intermediate fitting further comprises 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 part is used for connecting the strain insulator.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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

[0020] Figure 1 1 is a schematic structural diagram of a transmission pole 1000 according to an embodiment of the present application;

[0021] Figure 2 This is a schematic structural diagram of a first cross arm 100 according to an embodiment of the present application;

[0022] Figure 3 yes Figure 2 A magnified schematic diagram of point A in the middle;

[0023] Figure 4 yes Figure 2 A magnified schematic diagram of point B in the middle;

[0024] Figure 5 This is a schematic structural diagram of a second intermediate hardware 130 according to another embodiment of the present application;

[0025] Figure 6 This is a schematic diagram of the wire hanging structure of the end fitting 140 according to one embodiment of the present application;

[0026] Figure 7is a structural schematic view of an end fitting 140 according to another embodiment of the present application;

[0027] Figure 8 is a structural schematic view of an end fitting 140 according to another embodiment of the present application;

[0028] Figure 9 is a structural schematic view of a second cross arm 200 according to an embodiment of the present application;

[0029] Figure 10 is a structural schematic view of a connecting fitting 300 according to an embodiment of the present application;

[0030] Figure 11 is a structural schematic view of a third cross arm 400 according to an embodiment of the present application;

[0031] Figure 12 is a structural schematic view of a power transmission pole 2000 according to another embodiment of the present application. DETAILED DESCRIPTION

[0032] In accordance with the requirements, a specific embodiment 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 can be embodied in various forms. Therefore, the specific details disclosed herein should not be considered as limiting, but merely as a representative basis for the claims and as a representative basis for teaching those skilled in the art to apply the present application in any appropriate manner in practice, including the use of various features disclosed herein and in combination with features that can not be explicitly disclosed herein.

[0033] In the present application, "connection" should be understood in a broad sense unless otherwise explicitly specified or limited, which can be direct connection or connection through an intermediate medium. In the description of the present application, it should be understood that the orientation or position relationship indicated by "upper", "lower", "end", "one end" and the like is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0034] In an application scenario, as shown in Figure 1 The present application provides a power transmission pole 1000, which is a straight pole including a composite cross arm 10 and a pole 20, and the composite cross arm 10 is fixed on the pole 20. In the power system, the straight pole refers to a pole tower used for supporting the conductor in the middle of the line.

[0035] The composite cross arm 10 comprises a first cross arm 100, two second cross arms 200, two connecting fittings 300 and a third cross arm 400, the length direction of the first cross arm 100 is arranged along the horizontal direction, and the two ends of the first cross arm 100 are used for hanging the conductor; one end of each of the two second cross arms 200 is connected to the middle part of the first cross arm 100, and the other end of the second cross arm 200 is used for connecting the pole 20; the length direction of the second cross arm 200 and the length direction of the first cross arm 100 are located in the same vertical plane, and the second cross arm 200 is located below the first cross arm 100; the other end of each of the two second cross arms 200 is connected to the two sides of the pole 20 through the two connecting fittings 300; one end of the third cross arm 400 is connected to the middle part of the first cross arm 100, and the other end of the third cross arm 400 is used for hanging the conductor; the length direction of the third cross arm 400 is arranged along the vertical direction and is located above the first cross arm 100. Among them, the length direction of the second cross arm 200 is arranged obliquely, which can overall raise the hanging height of the conductor, reduce the size of each cross arm while meeting the insulation distance, and save costs. Of course, the second cross arm can also be arranged vertically, and the length of the third cross arm can be increased to meet the insulation distance requirement.

[0036] The power transmission pole 1000 of the present application adopts the composite cross arm 10 to hang the conductor, the composite cross arm 10 adopts the overall insulating structure and raises the hanging height of the conductor as a whole through the second cross arm 200, prolongs the insulation distance between the conductor at the high-voltage end of the power transmission pole 1000 and the top of the pole 20 at the low-voltage end, so that no matter where the birds take off, stand or land on the power transmission pole 1000, no electric circuit is formed, effectively preventing accidents such as tripping caused by electric shock of birds, higher safety, lower operation and maintenance cost, while effectively reducing the probability of birds landing on the power transmission pole 1000 and being electrocuted to death, protecting biodiversity. In the traditional scheme, the straight pole supports the conductor by arranging the suspension insulator on the iron cross arm. Compared with the traditional iron cross arm, the composite cross arm 10 in the present application directly hangs the conductor, which can cancel the suspension insulator structure, make the cross arm structure simpler, installation more convenient, and not easy to rust, and has a longer service life.

[0037] It should be noted that the middle part written in the present application refers to the part between the two ends, not strictly the center part.

[0038] In combination Figures 2-4As shown, the first cross arm 100 comprises a first core rod 110 (only marked in the figure for illustration), two first intermediate fittings 120, a second intermediate fitting 130, two end fittings 140 and a first insulation layer 150, the two first intermediate fittings 120 are respectively connected to two different positions of the middle part of the first core rod 110 and the second cross arm 200; the second intermediate fitting 130 is located between the two first intermediate fittings 120, and the second intermediate fitting 130 connects the third cross arm 400 and the middle part of the first core rod 110; the two end fittings 140 are respectively connected to the two ends of the first core rod 110, and the end fittings 140 are used for hanging the conductor; and the first insulation layer 150 covers at least part of the outer circumferential surface of the first core rod 110.

[0039] The first intermediate fitting 120 comprises a first intermediate sleeve 121 and a first intermediate connecting part 122, the first intermediate sleeve 121 is sleeved on the middle part of the first core rod 110, specifically, the first intermediate sleeve 121 is sleeved on the outer circumference of the first core rod 110, and the first intermediate sleeve 121 is fixed on the first core rod 110 through a press-fit process; and the first intermediate connecting part 122 is arranged on the bottom side of the first intermediate sleeve 121, and the first intermediate connecting part 122 is used for connecting the second cross arm 200.

[0040] 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 section of the first core rod 110, so as to fix the first intermediate sleeve 121 on the outer circumference of the first core rod 110 and increase the contact area between them, thereby ensuring the connection strength between the first intermediate sleeve 121 and the first core rod 110.

[0041] The first intermediate connecting part 122 is a plate-shaped structure, which is vertically connected to the bottom side of the first intermediate sleeve 121, and the first intermediate connecting part 122 is located in the middle part of the first intermediate sleeve 121, so that the subsequent second cross arm 200 is more uniform after installation; the first intermediate connecting part 122 is provided with a first connecting hole 1221, which is used for matching connection with the second cross arm 200 through bolts, screws and other fasteners, that is, without punching holes on the first intermediate sleeve 121 and the first core rod 110 for connection, thereby avoiding the influence of punching holes on the mechanical properties of the first core rod 110, and further avoiding the generation of power safety hazards. In the 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 penetrating 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 fitting 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, facilitating 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 arranged in other directions, as long as it can be matched with the second cross arm, which is not limited here.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] Combine Figure 2 、 Figures 6-8 As shown, the end fitting 140 includes an end sleeve 141 and a hanging portion 142 connected to each other. 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.

[0048] In one embodiment, if Figure 6As shown, the end fitting 140 is a gland type fitting, and 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 closed pipe structure at one end, and the cross-sectional shape and size of the end sleeve 141 match the cross section of the first core rod 110; the hanging part 142 includes a base 1421, a gland 1422 and two ear pieces 1423. The base 1421 covers the end of the end sleeve 141 which is not connected with the first core rod 110, the base 1421 is provided with a first slot 14211, which is an arc-shaped slot for placing the wire, and the base 1421 is provided with two mounting holes, which are respectively located on the two sides of the first slot 14211 and used for matching connection with the gland 1422; the bottom of the gland 1422 is provided with a second slot 14221, which is also an arc-shaped slot for assisting in fixing the wire, and the setting direction of the first slot 14211 and the second slot 14221 is 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 on the two sides of the gland 1422, and the two ear pieces 1423 are located on the two sides of the axial direction of the second slot 14221, the ear piece 1423 is provided with a mounting hole, and the mounting holes on the two ear pieces 1423 are correspondingly provided on the mounting holes on the base 1421, so that the ear piece 1423 can be fastened and connected with the base 1421 through bolts, screws and other fasteners, and then the gland 1422 can be tightly fixed to the wire. When installing the wire, the wire is placed in the first slot 14211, the gland 1422 is placed above the wire, the second slot 14221 is matched with the top of the wire and tightly presses the wire, and then the fastener is correspondingly threaded through the mounting holes on the ear piece 1423 and the base 1421 and is tightly fixed, so that the gland 1422 is fixedly connected with the base 1421, thereby stably hanging the wire on the end fitting 140.

[0049] Further, the bottom of the hanging part 142 is provided with a lifting part 143, the lifting part 143 is provided with a lifting hole 1431, which is used to meet the lifting requirement, that is, to lift and install the first cross arm 100 through a rope and other tools, and the width of the lifting part 143 along the wire extension direction is less than the width of the end sleeve 141, which can reduce the weight of the end fitting 140 while ensuring the wire hanging effect, and reduce the cost.

[0050] In another embodiment, as Figure 7As shown, the end fitting 140 is a groove type clamp fitting, and the conductor can be hung by the support clamp 11. The end fitting 140 comprises a connected end sleeve 141 and a hanging part 142. The structure of the end sleeve 141 is as described above, and will not be repeated here. The hanging part 142 is a groove structure, which covers the end of the end sleeve 141 not connected to the first core rod 110. The groove structure is a U-shaped groove, and the groove opening is upwardly arranged. Two side walls of the U-shaped groove are provided with mounting holes, which are used to install the support clamp 11 by bolts, screws and other fasteners, so as to hang the conductor. The support clamp 11 comprises a clamp base and a clamp cover. The clamp base is provided with an arc-shaped groove for placing the conductor. The bottom of the clamp cover is provided with an arc-shaped groove for assisting in fixing the conductor. The arc-shaped grooves on the clamp base and the clamp cover are provided with mounting holes on both sides, which are used to press and fix the conductor between the clamp base and the clamp cover by bolts, screws and other fasteners. The both ends of the clamp base are also provided with mounting holes for fixedly connecting with the two side walls of the U-shaped groove. When installing the conductor, the conductor is first fixed on the support clamp 11, i.e. the conductor is placed in the arc-shaped groove of the clamp base, and the clamp cover is press-fixed on the clamp base. Then, the support clamp 11 is placed in the groove structure of the end fitting 140, and the mounting holes on both ends of the clamp base are aligned with the mounting holes on the two side walls of the U-shaped groove, and then the fasteners are passed through to fix the support clamp 11 in the groove structure, so as to stably hang the conductor on the end fitting 140. The bottom of the hanging part 142 is provided with a lifting part 143, and the structure and purpose of the lifting part 143 are as described above, and will not be repeated here. The support clamp 11 adopts the clamp structure in the prior art, and will not be specifically limited here.

[0051] In yet another embodiment, as shown in Figure 8 the end fitting 140 is a plate type clamp fitting, and the conductor can be hung by the suspension clamp 12. The end fitting 140 comprises a connected end sleeve 141 and a hanging part 142. The structure of the end sleeve 141 is as described above, and will not be repeated here. The hanging part 142 is a plate structure, which comprises a vertical connected end plate and a wire hanging plate. The end plate covers the end of the end sleeve 141 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 mounting holes, which are used to install the suspension clamp 12 by a U-shaped hanging ring and other components, so as to hang the conductor. When installing the conductor, the conductor is first fixed on the suspension clamp 12, and then the suspension clamp 12 is assembled with the U-shaped hanging ring. Then, the U-shaped hanging ring is clamped on both sides of the wire hanging plate of the end fitting 140, and the mounting holes on the U-shaped hanging ring are aligned with the mounting holes on the wire hanging plate, and then the fasteners such as bolts and screws are passed through to hang the suspension clamp 12 on the wire hanging plate, so as to stably hang the conductor on the end fitting 140. The width of the wire hanging plate along the extension direction of the conductor is less than the width of the end sleeve 141, which can reduce the weight of the end fitting 140 and reduce the cost while ensuring the wire hanging effect. The suspension clamp 12 adopts the clamp structure in the prior art, and will not be specifically limited here.

[0052] In other embodiments, the end fitting can also adopt an existing fitting structure as long as it can be used to hang the conductor, which is not specifically limited here.

[0053] As shown in Figure 9 The second cross arm 200 includes a second core rod 210 (only marked in the figure for illustration), a first fitting 220, a second fitting 230, and a second insulating layer 240. The first fitting 220 connects one end of the second core rod 210 and the middle part of the first cross arm 100. The second fitting 230 connects the other end of the second core rod 210 and the connecting fitting 300. The second insulating layer 240 covers at least part of the outer circumferential surface of the second core rod 210.

[0054] The first fitting 220 includes a first sleeve 221 and a first connecting part 222 connected to each other. 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 press-fit process. The first connecting part 222 is used to connect the middle part of the first cross arm 100. The first connecting part 222 is in a plate-like structure, and a third connecting hole 2221 is provided on the first connecting part 222. The third connecting hole 2221 is used to match and connect with the first connecting hole 1221 on the first intermediate connecting part 122, so as to realize the assembly of the first cross arm 100 and the second cross arm 200. When installing, the first connecting part 222 is arranged in close contact with the first intermediate connecting part 122, and the third connecting hole 2221 is aligned with the first connecting hole 1221. Then a fastener such as a bolt or a screw is arranged through the third connecting hole 2221 and the first connecting hole 1221 and is fastened, so as to connect the first connecting part 222 and the first intermediate connecting part 122 together, thereby connecting one end of the second cross arm 200 to the middle part of the first cross arm 100.

[0055] The second fitting 230 comprises a second sleeve 231 and a second connecting portion 232 connected with each other. 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 with the second core rod 210 through a press-fit process. The second connecting portion 232 is used to be connected with the connecting fitting 300, so as to connect the second cross arm 200 with the pole 20. The second connecting portion 232 comprises a first connecting plate 2321 and two second connecting plates 2322. The first connecting plate 2321 covers the end of the second sleeve 231 which is not connected with the second core rod 210. The two second connecting plates 2322 are respectively connected with the two ends of the first connecting plate 2321 perpendicularly, and the two second connecting plates 2322 extend away from the second sleeve 231 from the two ends of the first connecting plate 2321 in the same direction, so that the second connecting portion 232 has a "Fang" shape structure. Two groups of fourth connecting holes 23221 are arranged on each second connecting plate 2322, and the fourth connecting holes 23221 on the two second connecting plates 2322 are arranged correspondingly, so as to be connected with the connecting fitting 300 through bolts, screws and other fasteners. That is, the second sleeve 231 and the second core rod 210 do not need to be punched for connection, so as to avoid the influence of punching on the mechanical properties of the second core rod 210, and further avoid the generation of power safety hazards.

[0056] As shown in Figure 10 The connecting fitting 300 comprises a pole connecting portion 310 and a cross arm connecting portion 320 connected with each other. The pole connecting portion 310 is connected with the pole 20, and the cross arm connecting portion 320 is connected with 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.

[0057] In the embodiment, the cross section of the pole 20 is square, and the pole connecting portion 310 is correspondingly provided in a plate shape structure, so as to increase the contact area between the pole connecting portion 310 and the pole 20, and ensure the reliable connection therebetween. The pole connecting portion 310 comprises a first plate member 311. The first plate member 311 is provided with a first pole connecting hole 3111, so as to be abutted and fixed on the pole 20 through bolts, screws and other fasteners.

[0058] The cross arm connecting part 320 comprises two second plate members 321, one end of each of the two second plate members 321 is connected perpendicularly to two ends of the first plate member 311, and the two second plate members 321 extend away from the first plate member 311 in the same direction from the two ends of the first plate member 311, the distance between the mutually approaching plate surfaces of the two second plate members 321 is slightly greater than the distance between the mutually far-removed plate surfaces of the two second connecting plates 2322 of the second connecting part 232 of the second fitting 230, on the one hand, the second connecting part 232 can move between the two second plate members 321, facilitating the adjustment of the angle between the second cross arm 200 and the pole 20; on the other hand, the two second plate members 321 can clamp and fix the two second connecting plates 2322 through bolts, screws and other fasteners, ensuring the reliable connection between the second cross arm 200 and the pole 20. The second plate member 321 is provided with a fixing hole 3211 and an adjusting hole 3212, the fixing hole 3211 is a circular through hole, and the adjusting hole 3212 is an arc-shaped hole, the circular arc of the adjusting hole 3212 is concentrically arranged with the fixing hole 3211, and the two are matched to enable the second cross arm 200 to rotate around the fixing hole 3211, facilitating the adjustment of the angle between the second cross arm 200 and the pole 20 and the fixed connection of the second cross arm 200 and the connecting fitting 300. The fixing hole 3211 and the adjusting hole 3212 on each second plate member 321 are respectively arranged in correspondence with two groups of fourth connecting holes 23221 on each second connecting plate 2322, so as to adjust the angle between the second cross arm 200 and the pole 20 and fix the second cross arm 200 and the connecting fitting 300, and then the angle between the second cross arm 200 and the pole 20 can be adjusted according to the design requirement, the installation is flexible and the connection is reliable; and the independent fitting structure makes it applicable to the installation of composite cross arms 10 of different length specifications, and the application range is wider.

[0059] In the embodiment, the length of the first plate member 311 along the length direction of the pole 20 is less than the length of the second plate member 321, and the first plate member 311 is located at the upper part of the second plate member 321, the fixing hole 3211 and the adjusting hole 3212 are located at the middle part of the second plate member 321, i.e. the fixing hole 3211 and the adjusting hole 3212 are located below the first pole connecting hole 3111, which can avoid the fasteners between the pole connecting part 310 and the pole 20 affecting the rotation adjustment of the angle between the second cross arm 200 and the pole 20, and also can reduce the material consumption of the connecting fitting 300 and reduce the manufacturing cost.

[0060] When the connecting fitting 300 is installed, first, the first plate 311 of the pole connecting part 310 is arranged close to the pole 20, and the first pole connecting hole 3111 on the first plate 311 is aligned with the mounting hole on the pole 20, then a fastener such as a bolt or screw is inserted and fastened, and the connecting fitting 300 is fixed on the pole 20. When the second cross arm 200 is installed, the second connecting part 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 part 232 are aligned, and a fastener such as a bolt or screw is inserted in the corresponding fixing hole 3211 and fourth connecting hole 23221, adjusting hole 3212 and fourth connecting hole 23221 to be pre-fixed, that is, to define the approximate position of the two under the premise of not affecting the rotation of the second connecting part 232 in the cross arm connecting part 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 fastener in the fixing hole 3211 remains in place, the fastener in the adjusting hole 3212 slides in the adjusting hole 3212 around the fixing hole 3211 to adjust, when the angle between the second cross arm 200 and the pole 20 is adjusted to the preset angle, the above fastener is fastened, and the second cross arm 200 and the pole 20 are fixedly connected. In other embodiments, after the connecting fitting is fixed on the pole, only the fastener can be inserted in the corresponding fixing hole and fourth connecting hole for pre-fixing, and when the second cross arm is adjusted in place, the fastener is then fastened, and the fastener is inserted in the corresponding adjusting hole and fourth connecting hole and fastened to fixedly connect the second cross arm and the pole, which is not specifically limited here.

[0061] 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, 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 the axial 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.

[0062] 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.

[0063] like Figure 11As shown, the third cross arm 400 comprises a third core rod 410 (only marked in the figure for illustration), a bottom fitting 420, a top fitting 430, a third insulation 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, the top fitting 430 connects the other end of the third core rod 410 for hanging the conductor; the third insulation layer 440 covers at least part of the outer circumferential surface of the third core rod 410. The bottom fitting 420 comprises a bottom sleeve 421 and a bottom connecting part 422 connected with each other, one end of the bottom sleeve 421 is connected with one end of the third core rod 410, for example, the bottom sleeve 421 can be connected with the third core rod 410 through a press-fit process; since the bottom fitting 420 needs to be fixedly connected with the second intermediate fitting 130 of the first cross arm 100, the bottom connecting part 422 is correspondingly arranged with the second intermediate connecting part 132.

[0064] In an embodiment, in combination with Figure 5 When the second intermediate fitting 130 comprises two plate members, the second top plate 1325 is provided with a second connecting hole 13251, and the bottom connecting part 422 is a bottom plate 422 in a plate structure, the bottom plate 422 is provided with a fifth connecting hole 4221 for matching connection with the second connecting hole 13251 to realize the assembly of the first cross arm 100 and the third cross arm 400. During installation, the bottom plate 422 is arranged in close contact with the second top plate 1325, and after the second connecting hole 13251 and the fifth connecting hole 4221 are aligned, a fastener such as a bolt or a screw is arranged and fastened to connect the second intermediate connecting part 132 and the bottom plate 422 together, so as to vertically install the third cross arm 400 above the middle part of the first cross arm 100. In the embodiment, the second top plate 1325 is provided with two second connecting holes 13251, and the bottom plate 422 is correspondingly provided with two fifth connecting holes 4221. In other embodiments, the second top plate can be provided with more second connecting holes, and the bottom plate is correspondingly provided with a corresponding number of fifth connecting holes, which can be adjusted according to the installation requirements of the third cross arm, and specific limitations are not made herein.

[0065] In another embodiment, in combination with Figure 1 and Figure 4 When the second intermediate fitting 130 comprises five plate members, the first top plate 1322 is provided with a second connecting hole 13221, and the bottom connecting part is directly arranged in the second connecting hole 13221 of the first top plate 1322 in a threaded structure and is fixed by screwing a nut, so as to fix the second intermediate connecting part 132 and the bottom connecting part, thereby vertically installing the third cross arm 400 above the middle part of the first cross arm 100.

[0066] 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. 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 pressure-capping fitting, groove-type wire clamp fitting, and plate-type wire clamp fitting, which will not be repeated; or an existing wire hanging fitting structure may also be adopted. As long as the wire can be hung stably, no specific limitation is made here.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] In an embodiment, each fitting is connected together by welding after being formed into a separate fitting assembly, which is reliable and simple to manufacture. In other embodiments, each fitting can be integrally formed by casting or the like, as long as the connection strength between each component is ensured, which is not specifically limited herein.

[0071] In an embodiment, the first, second and third insulation layers 150, 240 and 440 each include a sheath, the sheath of the first insulation layer 150 is in sealed connection between the first intermediate fitting 120, the second intermediate fitting 130 and the end fittings 140 at both ends of the middle part of the first core rod 110, the sheath of the second insulation layer 240 is in sealed connection between the first fitting 220 and the second fitting 230 at both ends of the second core rod 210, and the sheath of the third insulation layer 440 is in sealed connection between the bottom fitting 420 and the top fitting 430 at both ends of the third core rod 410, which can effectively prevent external moisture from damaging the first, second and third core rods 110, 210 and 410, thereby avoiding affecting the service life of the composite cross arm 10.

[0072] Further, the first, second and third insulation layers 150, 240 and 440 can further include umbrella skirts arranged on the sheaths, the arrangement of the umbrella skirts can increase the creepage distance of the outer surfaces of the first, second and third cross arms 100, 200 and 400, so that the composite cross arm 10 has sufficient dry arc distance, in addition, the arrangement of the umbrella skirts can also prevent birds from nesting, and improve the overall electrical safety of the composite cross arm 10.

[0073] In an embodiment, the first, second and third insulation layers 150, 240 and 440 are high-temperature vulcanized silicone rubber, the silicone rubber material is coated on the outer periphery of the first, second and third core rods 110, 210 and 410 by integral vacuum injection molding process, and the high-temperature vulcanized silicone rubber insulation layer is formed integrally, 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, second and third insulation layers can also be formed by molding process or pre-molding and then sleeved on the outer periphery of the corresponding core rod, which is not specifically limited herein.

[0074] 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 all 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 first 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. No specific restrictions are made here.

[0075] In another application scenario, such as Figure 12 As shown, the present application also provides a transmission pole 2000, which is a tension pole. The tension pole includes a composite crossarm 30 and a pole 40, with the composite crossarm 30 fixed to the pole 40. In the power system, a tension pole refers to a tower used to segment the circuit in the middle of a line to control the scope of pole collapse and line breakage. The tension pole is equipped with tension insulators and tension clamps on the crossarm to hang the conductor.

[0076] The composite crossarm 30 includes a first crossarm 500, two second crossarms 200, two connecting hardware 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 clamps 13 to hang the conductors; one end of the two tension insulators 600 is respectively connected to both sides of the middle part of the first crossarm 500, and the other end of the tension insulator 600 is used to connect to the tension clamps 13 to hang the conductors. The length direction of the tension insulator 600 is perpendicular to the length direction of the first crossarm 500.

[0077] Specifically, the second intermediate hardware 530 of the first crossarm 500 also includes two insulator connecting parts 533, which are arranged on the bottom side of the second intermediate sleeve and symmetrically 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-shaped 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 crossarm 400 is used to hang a jumper. Specifically, the wire hung on one of the tension insulators 600 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 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.

[0078] The end fitting 540 comprises an end sleeve 541 and two hanging parts 542, the hanging parts 542 are hung with the conductor by the strain clamp 13, the two hanging parts 542 are arranged on the bottom side of the end sleeve 541 and symmetrically arranged along the axis of the end sleeve 541, the hanging part 542 is a plate structure, and the hanging part 542 is provided with a clamp connecting hole for connecting the strain clamp 13 through a hanging ring or the like connecting assembly.

[0079] The strain insulator 600 can adopt the strain composite insulator structure in the prior art, the strain clamp 13 can adopt the clamp structure in the prior art, and the mounting mode of the strain insulator 600 and the strain clamp 13 can also be realized by the prior art, which is not specifically limited here.

[0080] The beneficial effects of the present application are: Different from the prior art, the composite cross arm of the present application comprises a first cross arm, two second cross arms, a connecting fitting, and a third cross arm, through the full-insulated overall structure of the composite cross arm and the overall lifting of the hanging height of the conductor of the second cross arm, the insulation distance between the conductor of the high-voltage end of the power transmission pole and the top of the pole of the low-voltage end is prolonged, so that no matter where the birds take off, stand or land on the power transmission pole, no electric circuit is formed, effectively preventing accidents such as tripping caused by electric shock of birds, higher safety, lower operation and maintenance cost, while effectively reducing the probability of bird electrocution and protecting biodiversity.

[0081] Meanwhile, the second cross arm and the pole are connected by the adjustable connecting fitting, the angle between the second cross arm and the pole can be adjusted according to design requirements, the installation is flexible and the connection is reliable; and the independent fitting structure makes it applicable to install composite cross arms of different length specifications, and the application range is wider.

[0082] In addition, compared with the traditional iron cross arm, the composite cross arm of the present application directly hangs the conductor, which can cancel the suspension insulator structure, make the cross arm structure simpler, installation more convenient, and less prone to rust, longer service life; and each insulating layer adopts high-temperature vulcanized silicone rubber, which has good aging resistance and hydrophobic migration, can reduce the probability of pollution flashover and rain flashover, and improve the electrical safety of the composite cross arm.

[0083] The technical content and technical features of the present application have been disclosed as above, however, it can be understood that under the creative idea of the present application, those skilled in the art can make various changes and improvements to the above structure and material, including the combination of technical features disclosed or claimed herein, obviously including other combinations of these features. These modifications and / or combinations all fall within the technical field to which the present application relates, and fall within the protection scope of the claims of the present application.

Claims

1. A composite cross arm, characterized in that: include: a first cross arm, wherein the 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; 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 is connected to the middle part of the first cross arm, the other end of the third cross arm is used for hanging a wire, and the length direction of the third cross arm is arranged along the vertical direction and is located above 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, the second intermediate hardware being located between the two first intermediate hardwares, and connecting the third cross arm 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 wire; 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 is provided on the top side of the second intermediate sleeve, and is used to connect the third cross arm.

5. The composite cross arm according to claim 2, characterized in that: The end fitting includes 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 directly hang the wire or to hang the wire through a wire 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. The composite cross arm according to claim 4, characterized in that: The second intermediate hardware further includes two insulator connecting parts, which are arranged on the bottom side of the second intermediate sleeve and symmetrically along the axis of the second intermediate sleeve. The insulator connecting parts are used to connect tension insulators.

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

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