Composite cross arm and power transmission pole

Abstract

The invention discloses a composite cross arm, which comprises a first cross arm, a second cross arm, a third cross arm, a fourth cross arm, a fifth cross arm and a sixth cross arm, and is characterized in that two ends of the first cross arm are used for hanging wires through strain clamps; 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 to the two sides of the electric pole through the two connecting fittings respectively; one ends of the two strain assemblies are connected to the two sides of the top of the first cross arm respectively, the other ends of the two strain assemblies are provided with wires in a hanging mode through strain clamps, and the length direction of the strain assemblies is perpendicular to the vertical plane where the first cross arm is located. According to the composite cross arm, accidents such as tripping caused by electric shock of birds can be effectively prevented, the safety is higher, and the operation and maintenance cost is lower. The invention further discloses a power transmission pole.

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 and a power transmission pole. Background Art

[0002] Crossarms are components installed on poles in overhead lines, and their main function is to support conductors. Traditional transmission poles use iron crossarms, and conductors are connected by installing insulators on the iron crossarms. When the conductors are bare conductors, birds taking off or landing from transmission poles may touch any two conductors or any one conductor and the iron crossarm at the same time, forming an energized loop and causing electric shock, which will directly affect the normal operation of power infrastructure, leading to accidents such as tripping, and will also cause bird deaths and reduce biodiversity.

[0003] At present, insulating sheaths are usually installed around bare wires near poles to protect birds from electric shocks. However, this protection method is expensive and has poor long-term effects. It requires regular replacement and maintenance, and has high operating and maintenance costs. Summary of the invention

[0004] In view of the shortcomings of the prior art, one of the purposes of this application is to provide a composite crossarm that adopts a fully insulating structure and raises the hanging height of the conductor by the second crossarm as a whole, which can effectively prevent accidents such as tripping caused by electric shocks to birds, with higher safety and lower operation and maintenance costs.

[0005] To achieve the above-mentioned purpose, the technical solution adopted in the present application is: a composite crossarm, comprising: a first crossarm, the first crossarm is an inverted V-shaped structure, and the two ends of the first crossarm are respectively used to hang conductors through tension clamps; two second crossarms, one ends of the two second crossarms are respectively connected to the middle of the first crossarm, and the other ends of the second crossarms are used to connect to the poles, and the length direction of the second crossarms is inclined, the second crossarms are arranged below the first crossarm and are located in the same vertical plane as the first crossarm; two connecting hardware, the other ends of the two second crossarms are respectively connected to the two sides of the pole through two connecting hardware; two tension components, one ends of the two tension components are respectively connected to the two sides of the top of the first crossarm, and the other ends of the tension components are used to hang conductors through tension clamps, and the length direction of the tension components is perpendicular to the vertical plane where the first crossarm is located.

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

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

[0008] Among them, the second intermediate hardware includes: a top connecting part, on which a first hanging part is provided, and the first hanging part is used to hang the jumper through a suspension wire clamp; two second intermediate sleeves, which are respectively sleeved on one end of the two first core rods, and the two second intermediate sleeves are respectively connected to the two ends of the top connecting part; two tension connecting parts, which are arranged on the top side of the top connecting part and are symmetrically arranged along the vertical plane where the first cross arm is located, and the tension connecting parts are used to connect the tension components.

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

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

[0011] Among them, the strain connection part is a plate-like structure, and a strain connection hole is provided on the strain connection part, which is used to connect the strain component, and the strain component is a strain insulator; or, the strain connection part is a strain connection hole, and the strain component is a strain fitting, and the strain fitting includes a first connecting plate and a second connecting plate vertically connected, the first connecting plate is used to connect to the top connecting part, and the second connecting plate is used to connect the strain wire clamp.

[0012] The end fitting includes an end sleeve and a second hanging portion, the end sleeve is used to connect the other end of the first core rod, and the second hanging portion is used to hang the conductor through the tension clamp.

[0013] Among them, the second cross arm includes: a second core rod; a first hardware, the first hardware connecting one end of the second core rod and the middle part of the first cross arm; a second hardware, the second hardware connecting the other end of the second core rod and the connecting hardware; a second insulating layer, the second insulating layer covers at least part of the outer circumference of the second core rod.

[0014] The connecting fittings include a connected pole connecting portion and a cross arm connecting portion, the pole connecting portion is connected to the pole, and the cross arm connecting portion 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.

[0015] Among them, the pole connecting part includes a first plate, which is abutted and fixed on the pole; the crossarm connecting part includes two second plates, which are 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 plate is provided with a fixing hole and an adjustment hole, which are used to make the angle between the second crossarm and the pole adjustable.

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

[0017] Among them, the pole connecting part also includes a third plate, which is used to match and connect with the pole. The two ends of the third plate are respectively connected to the other ends of the two second plates that are not connected to the first plate. The length of the third plate along the length direction of the pole is less than the length of the second plate, and the third plate is located at the lower part of the second plate.

[0018] Among them, the composite cross arm also includes an insulating protective cover, which includes a connecting hardware protective cover and a pole protective cover. The connecting hardware protective cover is used to cover the connecting hardware, and the pole protective cover is used to cover the top of the pole.

[0019] 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.

[0020] 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, two connecting hardware, and two tension-resistant components. The composite crossarm as a whole adopts a fully insulating structure 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 probability of birds being electrocuted to death when landing on the transmission pole, thereby protecting biodiversity.

[0021] 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.

[0022] 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

[0023] Figure 1 is a schematic structural diagram of a transmission pole 1000 according to an embodiment of the present application;

[0024] Figure 2 is a structural schematic diagram of a first cross arm 100 according to an embodiment of the present application;

[0025] Figure 3 It is a partial structural enlarged schematic diagram of a first intermediate hardware 120 fixed on a first core rod 110 according to an embodiment of the present application;

[0026] Figure 4 yes Figure 2 The enlarged schematic diagram of point A in the middle;

[0027] Figure 5 This is a schematic diagram of the wire hanging structure of the second intermediate hardware 130 in one embodiment of the present application;

[0028] Figure 6 This application Figure 2 The enlarged schematic diagram of point B in the middle;

[0029] Figure 7 It is a partial structural schematic diagram of a first cross arm 100 according to an embodiment of the present application;

[0030] Figure 8 It is a schematic diagram of the wire hanging structure of the end fitting 140 according to an embodiment of the present application;

[0031] Fig. 9 is a structural schematic diagram of an end fitting 140 according to another embodiment of the present application;

[0032] Fig.10 is a structural schematic diagram of a second cross arm 200 according to an embodiment of the present application;

[0033] Fig.11 It is a structural schematic diagram of a connection fitting 300 according to an embodiment of the present application;

[0034] Fig.12 is a structural schematic diagram of a connection fitting 300 according to another embodiment of the present application;

[0035] Fig.13 is a schematic structural diagram of a transmission pole 2000 according to another embodiment;

[0036] Fig.14 is a partial structural schematic diagram of a transmission pole 2000 according to another embodiment of the present application;

[0037] Fig.15 is a structural schematic diagram of a transmission pole 2000 according to another embodiment of the present application;

[0038] Fig.16 It is a schematic diagram of the partial structure of a transmission pole 1000 according to another embodiment of the present application. DETAILED DESCRIPTION

[0039] 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.

[0040] 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.

[0041] 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.

[0042] The composite crossarm 10 includes a first crossarm 100, two second crossarms 200 and two connecting hardware 300. The first crossarm 100 is an inverted V-shaped structure. The top and both ends of the first crossarm 100 are used to hang the conductors respectively; the two second crossarms 200 are respectively connected to the opposite sides of the pole 20 to form a V-shaped structure, one end of the two second crossarms 200 is respectively connected to the middle of the first crossarm 100, and the other ends of the two second crossarms 200 are respectively connected to the two sides of the pole 20 through two connecting hardware 300. The second crossarm 200 is inclined in the length direction, and the second crossarm 200 is arranged below the first crossarm 100 and is located in the same vertical plane as the first crossarm 100.

[0043] 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.

[0044] 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.

[0045] Combination Figure 2 As shown, the first cross arm 100 includes two first core rods 110 (the marks in the figure are for illustration only), two first intermediate hardware 120, a second intermediate hardware 130, two end hardware 140 and a first insulating layer 150, the two first core rods 110 are arranged at an angle; the two first intermediate hardware 120 are respectively connected to one end of the two second cross arms 200 and the middle of the two first core rods 110; one end of the two first core rods 110 is respectively connected to the two sides of the second intermediate hardware 130, and the second intermediate hardware 130 is used to hang the wire; the two end hardware 140 are respectively connected to the other ends of the two first core rods 110, and the end hardware 140 is used to hang the wire; the first insulating layer 150 covers at least part of the outer circumference of the first core rod 110.

[0046] The two first core rods 110 are arranged at an angle, that is, the two first core rods 110 are arranged to tilt downward, and the axis extension lines of the two first core rods 110 intersect, so that the first cross arm 100 can form an inverted V-shaped structure for hanging three-phase conductors.

[0047] Combination Figure 3 and Figure 4 As shown, the first intermediate hardware 120 includes a first intermediate sleeve 121 and a first intermediate connecting portion 122. The first intermediate sleeve 121 is sleeved on the middle part of the first core rod 110. Specifically, the first intermediate sleeve 121 is sleeved on the outer periphery of the first core rod 110, and the first intermediate sleeve 121 is fixed on the first core rod 110 by a crimping process; the side of the first intermediate sleeve 121 facing the second cross arm 200 is defined as the bottom surface, and the first intermediate connecting portion 122 is arranged on the bottom surface of the first intermediate sleeve 121. The first intermediate connecting portion 122 is used to connect the second cross arm 200.

[0048] 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.

[0049] The first intermediate connecting portion 122 is a plate-like structure, which is vertically connected to the bottom surface of the first intermediate sleeve 121, and the first intermediate connecting portion 122 is located in the middle of the first intermediate sleeve 121, so that the force on the subsequent second cross arm 200 is more uniform after installation; the first intermediate connecting portion 122 is provided with a first connecting hole 1221, which is used to match and connect with the second cross arm 200 through fasteners such as bolts and screws, that is, there is no need to drill holes on the first intermediate sleeve 121 and the first core rod 110 for connection, thereby avoiding drilling to affect the mechanical properties of the first core rod 110, thereby avoiding electrical safety hazards.

[0050] In one embodiment, if Figure 3 As shown, a first intermediate connecting part 122 can be provided, and the plate surface direction of the first intermediate connecting part 122 is provided along the axial direction of the first intermediate sleeve 121, and the through direction of the first connecting hole 1221 is perpendicular to the axial direction of the first intermediate sleeve 121, so that after the first intermediate hardware 120 is fixed on the first core rod 110, the plate surface direction of the first intermediate connecting part 122 and the length direction of the first cross arm 100 are located in the same vertical plane, which is convenient for the assembly of the first cross arm 100 and the second cross arm 200.

[0051] In another embodiment, Figure 4As shown, two first intermediate connecting parts 122 can be provided, and the two first intermediate connecting parts 122 are spaced apart at the two side edges of the bottom surface of the first intermediate sleeve 121, so that the two first intermediate connecting parts 122 can be matched and connected with the second cross arm 200 by clamping and fixing, and the connection strength between the first cross arm 100 and the second cross arm 200 is further improved without affecting the mechanical properties of the first core rod 110.

[0052] It is understandable that the number and specific configuration of the first intermediate connecting parts 122 may also be in other forms, as long as they can be matched and connected with the second cross arm 200 , and no specific limitation is made herein.

[0053] Combination Figure 5-Figure 7 As shown, the second intermediate fitting 130 includes a top connection part 131 and two second intermediate sleeves 132 respectively connected to both ends of the top connection part 131. The top connection part 131 is provided with a first hanging part 1311, and the first hanging part 1311 is used to hang the wire through the wire clamp; the two second intermediate sleeves 132 are respectively sleeved on one end of the two first core rods 110. The second intermediate sleeve 132 is a tubular structure with one end closed, the closed end is connected to the top connection part 131, and the open end is sleeved on one end of the first core rod 110, and the cross-sectional shape and size of the second intermediate sleeve 132 match the cross-sectional shape of the first core rod 110.

[0054] In one embodiment, if Figure 5 As shown, the top connection part 131 and the two second intermediate sleeves 132 are an integrated structure. The top connection part 131 is a plate-like structure, and the two second intermediate sleeves 132 are directly fixed on both sides of the top connection part 131, and the axes of the two second intermediate sleeves 132 are set at an angle, so that when the first core rod 110 is crimped into the second intermediate sleeve 132, the two first core rods 110 can directly form an inverted V-shaped structure, and the installation operation is simple and efficient; the first hanging part 1311 is provided in the middle of the bottom side of the top connection part 131.

[0055] Among them, the first hanging part 1311 can be a wire hanging plate, that is, the wire hanging plate is extended outward from the middle part of the bottom side of the top connecting part 131 along the board direction of the top connecting part 131, and the wire hanging plate is provided with a hanging hole for installing the suspension wire clamp 12 through components such as a U-shaped hanging ring to hang the wire. When installing the wire, first fix the wire on the suspension wire clamp 12, then assemble the suspension wire clamp 12 with the U-shaped hanging ring, and then clamp the U-shaped hanging ring on both sides of the wire hanging plate, and align the installation hole on the U-shaped hanging ring with the hanging hole, and then insert bolts, screws and other fasteners to hang the suspension wire clamp 12 on the hanging hole, so that the wire is firmly hung on the second intermediate hardware 130. The width of the wire hanging plate along the extension direction of the wire is smaller than the width of the top connecting part 131, which can reduce the weight of the top connecting part 131 while ensuring the hanging effect, thereby reducing costs.

[0056] Combination Figure 5 As shown, the first hanging portion 1311 can also be a hanging hole set in the middle of the bottom side of the top connecting portion 131, and the hanging wire clamp 12 is directly hung in the hanging hole to hang the wire, which can further reduce the weight of the top connecting portion 131 and reduce the cost. The hanging wire clamp 12 adopts the wire clamp structure in the prior art and is not specifically limited here.

[0057] In another embodiment, in combination Figure 6 and Figure 7 As shown, in order to make the assembly of the first cross arm 100 more flexible, the top connecting portion 131 and the second middle sleeve 132 are detachably connected via the second middle connecting portion 133 .

[0058] The second intermediate connection part 133 is arranged at the end of the second intermediate sleeve 132 that is not connected to the first core rod 110. The second intermediate connection part 133 is a plate structure, and its plate surface is arranged along the axial direction of the second intermediate sleeve 132. A group of second connection holes 1331 are arranged on the second intermediate connection part 133. The through direction of the second connection holes 1331 is perpendicular to the plate surface direction of the second intermediate connection part 133, and is used to match and connect with the top connection part 131. The width of the second intermediate connection part 133 along the extension direction of the wire is smaller than the width of the second intermediate sleeve 132, which can reduce the weight of the second intermediate hardware 130 while ensuring the connection strength, thereby reducing the cost.

[0059] The top connection part 131 includes two top connection plates 1312, and the two top connection plates 1312 clamp and fix the two second intermediate connection parts 133, which can effectively ensure the connection strength between the two, thereby ensuring the overall mechanical strength of the first cross arm 100. The two top connection plates 1312 are correspondingly provided with two groups of top connection holes 13121, and the two groups of top connection holes 13121 are respectively located on both sides of the top connection plate 1312, and the penetration direction of the top connection holes 13121 is perpendicular to the plate surface of the top connection plate 1312, and each group of top connection holes 13121 matches the number and position of the plurality of second connection holes 1331. On each top connecting plate 1312, the center of each group of top connecting holes 13121 is located on the same straight line, and the center line of the two groups of top connecting holes 13121 is set at an angle. Correspondingly, the centers of the plurality of second connecting holes 1331 are all located on the axis of the second intermediate sleeve 132. In this way, when the first mandrel 110 is installed in the second intermediate sleeve 132, and when the top connecting plate 1312 is matched and connected with the two second intermediate sleeves 132 through the two second intermediate connecting parts 133, the two first mandrels 110 can directly form an inverted V-shaped structure, and the installation operation is simple and efficient. During installation, the two top connecting plates 1312 are clamped on both sides of the two second intermediate connecting parts 133, and the two groups of top connecting holes 13121 on each top connecting plate 1312 are matched and aligned with the plurality of second connecting holes 1331 on the two second intermediate connecting parts 133, and then bolts, screws and other fasteners are inserted and tightened to connect the top connecting part 131 with the second intermediate sleeve 132. In other embodiments, the top connection hole and the second connection hole may also be arranged in other ways, as long as the two can be matched and connected so that the first cross arm has an inverted V-shaped structure as a whole, and no specific limitation is made here.

[0060] Furthermore, the top connecting plate 1312 is roughly triangular in structure, and two groups of top connecting holes 13121 are respectively arranged on the two side edges of the top connecting plate 1312, which can save unnecessary material waste, further reduce the weight of the top connecting part 131, and reduce costs.

[0061] At least one top connecting plate 1312 is provided with a first hanging portion 1311, and the structure of the first hanging portion 1311 is as described above and will not be described again. In one embodiment, one first hanging portion 1311 is provided, and when the first hanging portion 1311 adopts a wire hanging plate structure, a wire hanging plate can be directly extended and provided in the middle of the bottom side of one of the top connecting plates 1312 to hang the hanging wire clamp 12; when the first hanging portion 1311 adopts a hanging hole structure, a hanging hole can be directly provided in the middle of the bottom side of one of the top connecting plates 1312 to hang the hanging wire clamp 12, and a corresponding cavity is provided on the other top connecting plate 1312 to avoid interference with the first hanging portion 1311 hanging the wire. In another embodiment, two first hanging portions 1311 are provided. No matter what structure the first hanging portions 1311 adopts, the first hanging portions 1311 on the two top connecting plates 1312 are provided correspondingly. By cooperating with the two first hanging portions 1311 to hang the suspension wire clamp 12, the connection strength between the two can be further improved, thereby improving the overall mechanical strength of the first cross arm 100.

[0062] Furthermore, the first crossarm 100 can adopt a symmetrical inverted V-shaped structure, that is, the two second intermediate sleeves 132 are symmetrically and obliquely arranged on both sides of the top connecting portion 131, so that when the two first core rods 110 are respectively installed in the two second intermediate sleeves 132, the two first core rods 110 can be symmetrically and obliquely connected to both sides of the second intermediate hardware 130, so that the first crossarm 100 has a symmetrical structure as a whole, and the horizontal heights of the wires hung at both ends of the first crossarm 100 are equal, and the distances in the vertical direction from the wires hung on the top of the first crossarm 100 are equal, so that the first crossarm 100 is more balanced in force and the structure is more stable.

[0063] It can be understood that the angle of the V-shaped opening of the first crossarm 100 can be specifically designed according to the insulation requirements of the composite crossarm 10 in different application scenarios, as long as the connection angle between the top connecting part 131 and the two second intermediate sleeves 132 is adjusted accordingly. It can be achieved by replacing different second intermediate hardware 130 or providing multiple groups of top connecting holes 13121 with different angles on the top connecting plate 1312, etc., and no specific restrictions are made here.

[0064] Combination Figure 2 , Figure 7-Figure 9 As shown, the end fitting 140 includes a connected end sleeve 141 and a second hanging portion 142, the end sleeve 141 is used to connect the other end of the first core rod 110, and the second hanging portion 142 is used to directly hang the wire or to hang the wire through a wire clamp.

[0065] In one embodiment, if Figure 8As 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 second 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 second 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.

[0066] Furthermore, a hoisting portion 143 is provided at the bottom of the second hanging portion 142, and a hoisting hole 1431 is provided on the hoisting portion 143 to meet the hoisting requirements, that is, to be used for hoisting and installing the first cross arm 100 by means of tools such as ropes. The width of the hoisting portion 143 along the extension direction of the 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.

[0067] In another embodiment, Fig. 9As 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 second hanging portion 142. The structure of the end sleeve 141 is as described above and will not be repeated here; the second hanging portion 142 is a 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 notch of the U-shaped slot is set upward, and the two side walls of the U-shaped slot are correspondingly provided with mounting holes for mounting 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 second 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.

[0068] In another embodiment, Figure 2 and Figure 7As 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 second hanging portion 142. The structure of the end sleeve 141 is as described above and will not be repeated here; the second hanging portion 142 is a plate structure, which includes a vertically connected end plate and a wire hanging plate. The end plate covers the end of the end sleeve 141 that is not connected to the first core rod 110. The wire hanging plate extends vertically outward from the side of the end plate away from the end sleeve 141. The wire hanging plate is provided with a mounting hole for mounting the suspension 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.

[0069] 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.

[0070] like Figure 1 and Fig.10 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.

[0071] The first fitting 220 includes a connected first sleeve 221 and a first connecting portion 222. One end of the first sleeve 221 is connected to one end of the second core rod 210. For example, the first sleeve 221 can be connected to the second core rod 210 through a crimping process; the first connecting portion 222 is used to connect the middle part of the first cross arm 100. The first connecting portion 222 is a plate-like structure, and a third connecting hole 2221 is provided on the first connecting portion 222 for mating connection with the first connecting hole 1221 on the first intermediate connecting portion 122 to achieve the assembly of the first cross arm 100 and the second cross arm 200. During installation, the first connecting portion 222 is closely arranged with the first intermediate connecting portion 122, and after aligning the third connecting hole 2221 with the first connecting hole 1221, fasteners such as bolts and screws are inserted and tightened to connect the first connecting portion 222 with the first intermediate connecting portion 122, thereby connecting one end of the second cross arm 200 to the middle part of the first cross arm 100.

[0072] The second fitting 230 includes a connected second sleeve 231 and a second connecting portion 232. One end of the second sleeve 231 is connected to the other end of the second core rod 210. For example, the second sleeve 231 can be connected to the second core rod 210 through a crimping process; the second connecting portion 232 is used to connect with the connecting fitting 300, and further connect the second cross arm 200 and the electric pole 20. The second connecting portion 232 includes a first connecting plate 2321 and two second connecting plates 2322. The first connecting plate 2321 covers the end of the second sleeve 231 that is not connected to the second core rod 210. The two second connecting plates 2322 are respectively vertically connected to both ends of the first connecting plate 2321, and the two second connecting plates 2322 extend in the same direction away from the second sleeve 231 from both ends of the first connecting plate 2321, making the second connecting portion 232 in a "C"-shaped structure. Two groups of fourth connecting holes 23221 are provided on each second connecting plate 2322, and the fourth connecting holes 23221 on the two second connecting plates 2322 are correspondingly arranged for mating connection with the connecting fitting 300 through fasteners such as bolts and screws, that is, there is no need to drill holes on the second sleeve 231 and the second core rod 210 for connection, avoiding the influence of drilling on the mechanical properties of the second core rod 210 and further avoiding potential electrical safety hazards.

[0073] As Figure 1 、 Figure 10-12 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 electric pole 20, and the cross arm connecting portion 320 is connected to the other end of the second cross arm 200, and the angle between the second cross arm 200 and the electric pole 20 can be adjusted.

[0074] In this embodiment, the cross section of the pole 20 is square, and the pole connection part 310 is correspondingly configured as a plate-shaped structure, which can increase the contact area between the pole connection part 310 and the pole 20, and ensure a reliable connection between the two. The pole connection part 310 includes a first plate 311, and the first plate 311 is provided with a first pole connection hole 3111, which is used to abut and fix the first plate 311 on the pole 20 through fasteners such as bolts and screws.

[0075] The crossarm connecting portion 320 includes two second plates 321, which are roughly rectangular plates. 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.

[0076] In one embodiment, if Fig.11As shown, 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 on the side close to the pole 20, and the first plate 311 is connected to the upper part of the second plate 321, and the fixing hole 3211 and the adjusting hole 3212 are located in the middle part of the second plate 321, that is, the fixing hole 3211 and the adjusting hole 3212 are located below the first pole connecting hole 3111, 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.

[0077] 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.

[0078] 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 connected to the lower part of the second plate 321, 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 provision of the third plate 312, on the one hand, enables the upper and lower ends of the connecting fitting 300 to 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, provision of the third plate 312 at the end of the second plate 321 away from the pole 20 can avoid interference between the third plate 312 and the fasteners on the second plate 321 during installation.

[0079] In another embodiment, Fig.12 As shown, the length of the first plate 311 along the length direction of the pole 20 is equal to the length of the second plate 321 on the side close to the pole 20, so that the contact area between the pole connecting part 310 and the pole 20 can be increased, making the connection between the two more reliable. In addition, the second plate 321 can also be a roughly right-angled trapezoidal plate, that is, the lower edge of the second plate 321 is horizontally arranged, and the upper edge of the second plate 321 is inclined downward from the upper end of the first plate 311 toward the upper end of the third plate 312. In this way, the material consumption can be reduced while ensuring the connection strength of the connecting hardware 300, thereby reducing the manufacturing cost. It can be understood that the specific shape of the upper edge of the second plate 321 can be adjusted according to the position of the fixing hole 3211 and the adjustment hole 3212, as long as it does not affect the installation of the second cross arm 200, and no specific limitation is made here.

[0080] It can be understood that when the length of the first plate 311 is smaller than the length of the second plate 321 on the side close to the pole 20 and the first plate 311 is located on the upper part of the second plate 321, the lower part of the connecting hardware 300 close to the pole 20 is a hollow structure. During installation, the connecting hardware 300 is first connected to the pole 20 through the first plate 311, and then the second cross arm 200 is installed and adjusted into place, and then bolts, screws and other fasteners are inserted into the second pole connecting hole 3121 on the third plate 312 and the installation hole on the pole 20 and tightened to further fix the connecting hardware 300 on the pole 20. When the length of the first plate 311 is equal to the length of the second plate 321 on the side close to the pole 20, the lower part of the first plate 311 is provided with a third pole connecting hole (not shown) corresponding to the second pole connecting hole 3121. During installation, the third plate 312 can be connected to the pole 20 by inserting bolts, screws and other fasteners through the second pole connecting hole 3121, the third pole connecting hole and the mounting hole on the pole 20. The other steps are as described above.

[0081] Further, see Fig.11 The two second plates 321 are both provided with flanges 3213, which extend vertically from the side of the second plate 321 close to the pole 20 in a direction away from the first plate 311, and the two flanges 3213 are both located in the same plane as the first plate 311. The setting of the flanges 3213 can increase the contact area between the connecting hardware 300 and the pole 20, so that the force between the two is more uniform and the connection is more reliable.

[0082] Combination Figures 1 to 12 In one embodiment, the first core rod 110 and the second core rod 210 are both 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.

[0083] In one embodiment, the cross section of the first core rod 110 is square, and the cross section of the second core rod 210 is 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 and the second core rod can also be triangular, T-shaped, L-shaped, etc., as long as the structure of each core rod meets the strength requirements; each core rod can have different structures 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, or the cross sections of each core rod are square or circular, etc., and no specific restrictions are made here.

[0084] In one embodiment, the cross-sectional shape and size of the hardware sleeve on each mandrel match the cross-sectional shape of the corresponding mandrel, that is, the cross-sectional shape and size of the first intermediate sleeve 121, the second intermediate sleeve 132 and the end sleeve 141 match the cross-sectional shape of the first mandrel 110, and the cross-sectional shape and size of the first sleeve 221 and the second sleeve 231 match the cross-sectional shape of the second mandrel 210, so as to fix each sleeve on the corresponding mandrel, and to increase the contact area between each sleeve and the corresponding mandrel, thereby ensuring the connection strength between each hardware and the corresponding mandrel.

[0085] 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.

[0086] In one embodiment, the first insulating layer 150 and the second insulating layer 240 both include a sheath. The sheath of the first insulating layer 150 is sealedly connected to the first intermediate hardware 120 in the middle of the first core rod 110, the second intermediate hardware 130, 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, which can effectively prevent external water vapor from invading and damaging the first core rod 110 and the second core rod 210, thereby avoiding affecting the service life of the composite crossarm 10.

[0087] Furthermore, the first insulating layer 150 and the second insulating layer 240 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 and the second crossarm 200, 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.

[0088] In one embodiment, the first insulating layer 150 and the second insulating layer 240 are both high temperature vulcanized silicone rubber, and the silicone rubber material is coated on the outer periphery of the first core rod 110 and the second core rod 210 by an overall vacuum injection molding process to form an overall high temperature vulcanized silicone rubber insulating layer. The high temperature vulcanized silicone rubber has good aging resistance and hydrophobic migration, which can reduce the probability of pollution flashover and rain flashover, and improve the electrical safety of the composite cross arm 10. In other embodiments, the first insulating layer and the second insulating layer can also be molded or pre-formed and then sleeved on the outer periphery of the corresponding core rod, which is not specifically limited here.

[0089] It can be understood that the overall length of the composite crossarm 10 of the present application, the length of the first crossarm 100 and the second crossarm 200, the specifications of the supporting 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 can be fixed, or the first crossarm 100, the two second crossarms 200, and the connecting hardware 300 can be assembled first, and then installed on the pole 20 for adjustment and fixation, and no specific restrictions are made here.

[0090] In another application scenario, Figure 13-Figure 15 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 components and tension wire clamps on the cross arm to hang the conductor.

[0091] The composite crossarm 30 includes a first crossarm 400, two second crossarms 200, two connecting fittings 300 and two tension components 500. The structure of the composite crossarm 30 is basically similar to that of the composite crossarm 10, except that the two ends of the first crossarm 400 are used to connect to the tension clamps 13 to hang the conductors; one end of the two tension components 500 are respectively connected to the two sides of the top of the first crossarm 400, and the other end of the tension component 500 is used to connect to the tension clamps 13 to hang the conductors. The length direction of the tension component 500 is perpendicular to the vertical plane where the first crossarm 400 is located.

[0092] Specifically, the second intermediate hardware 430 of the first cross arm 400 also includes two tension connection parts 434, which are arranged on the top side of the top connection part 431 and symmetrically arranged along the vertical plane where the first cross arm 400 is located. The tension connection parts 434 are used to connect the tension assembly 500.

[0093] In one embodiment, if Fig.13 As shown, the tension connection part 434 is a plate-like structure, and a tension connection hole is provided on the tension connection part 434 for connecting the tension component 500 through a connecting component such as a hanging ring. At this time, the tension component 500 can be a tension insulator.

[0094] In another embodiment, Fig.14As shown, when the top connection part 431 includes two top connection plates, the tension connection part 434 can also be a tension connection hole set on the top side of the top connection plate, which is used to connect the tension component 500 through fasteners such as bolts and nuts. At this time, the tension component 500 can be a tension hardware. The tension hardware is an L-shaped structure as a whole, including a first connecting plate 510 and a second connecting plate 520 connected vertically, wherein the first connecting plate 510 is used to match and connect with the top connection part 431, and the second connecting plate 520 is used to connect the tension clamp 13 through a connecting component such as a hanging ring; the tension hardware also includes a reinforcing rib 530, which vertically connects the first connecting plate 510 and the second connecting plate 520 at the same time, which can further improve the mechanical strength of the tension hardware.

[0095] The first hanging part on the second intermediate hardware 430 is connected to the suspension wire clamp 12 for hanging the jumper. Specifically, the wire hung on one of the tension components 500 leads out the jumper from the tension wire clamp 13, and the jumper is first hung on the suspension wire clamp 12 and then hung on the tension wire clamp 13 on another tension component 500 on the other side of the pole 40, and the jumper is electrically connected to the wires on both sides of the pole 40.

[0096] In one embodiment, if Fig.13 As shown, the end fitting 440 includes an end sleeve 441 and a second hanging portion 442. The second hanging portion 442 specifically hangs the conductor through the tension clamp 13. The second hanging portion 442 is arranged on the side of the end sleeve 441 that is not connected to the first core rod 410. The second hanging portion 442 is a plate-like structure. The second hanging portion 442 includes an end plate and a hanging plate 4421. The end plate covers the end of the end sleeve 441 that is not connected to the first core rod 410. The hanging plate 4421 extends vertically outward from the side of the end plate away from the end sleeve 441. The hanging plate 4421 is provided with a hanging hole for hanging a triangular connecting plate 443 through a connecting component such as a U-shaped hanging ring. Two wire clamp connecting holes are provided at both ends of the bottom of the triangular connecting plate 443, which are respectively used to connect two tension clamps 13. By hanging the wires through the triangular connecting plate 443 and the tension clamp 13, the distance of the tension jumper can be guaranteed, thereby ensuring the electrical safety of the composite cross arm 30; on the other hand, a certain degree of rotatability can be provided. When longitudinal unbalanced tension appears in the wires on both sides of the composite cross arm 30, the triangular connecting plate 443 and the tension clamp 13 can be deflected, so that parameters such as the span of the wires on both sides (the horizontal distance between the wire hanging points of two adjacent transmission towers) change. Then, when the wires are deflected to the appropriate position, the tension of the wires on both sides reaches a new balance, the unbalanced tension is released, the stress on the composite cross arm 30 is reduced, and its service life is extended.

[0097] In another embodiment, Fig.15As shown, the wire hanging plate 4421 of the second hanging part 442 of the end fitting 440 extends outward obliquely from the side of the end plate away from the end sleeve 441, and when the end fitting 440 is crimped onto the end of the first core rod 410 and installed on the pole 40, the wire hanging plate 4421 is horizontally arranged, and a plurality of hanging holes are provided on the wire hanging plate 4421 for connecting the rectangular connecting plate 444. Two wire clamp connecting holes are provided at both ends of the rectangular connecting plate 444, which are respectively used to connect two tension clamps 13. The specific connection method is as described above and will not be repeated here. The plate area of ​​the rectangular connecting plate 444 is smaller than that of the triangular connecting plate 443, which can save materials and reduce costs. Furthermore, the cross-sectional size of one end of the end sleeve 441 connected to the end plate gradually decreases from the end of the first core rod 410 toward the end plate, so that the end sleeve 441 can use less material while firmly connecting the first core rod 410 and the end plate, and the two ends of the rectangular connecting plate 444 can adopt a trapezoidal or arc-shaped structure, so that the rectangular connecting plate 444 can use less material while meeting the requirements for opening the hanging hole, thereby reducing costs.

[0098] The tension insulator 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 and the tension clamp 13 may also be implemented using the prior art, without specific limitation herein.

[0099] Furthermore, the composite cross arm 10 on the linear rod and the composite cross arm 30 on the tension rod may further include an insulating protective cover 600. The following description will be made taking the linear rod as an example. Fig.16 As shown, the insulating protective cover 600 includes a connection hardware protective cover 610 and a pole protective cover 620. The connection hardware protective cover 610 is used to cover the connection hardware 300, and the pole protective cover 620 is used to cover the top of the pole 20. The connection hardware protective cover 610 and the pole protective cover 620 cooperate with each other to cover the metal structure on the top of the pole 20, strengthen the insulation effect on the top of the pole 20, further prevent birds from being electrocuted when they take off, stand or land on the top of the pole 20, further reduce the probability of birds being electrocuted, and protect biodiversity. The specific structure is as described above and will not be repeated.

[0100] Furthermore, the main structure of the insulating protective cover 600 is a rectangular structure with an open bottom, which is convenient for installing the insulating protective cover 600; and a plurality of cavities are provided on the insulating protective cover 600 for passing partial structures of the second cross arm 200 or fasteners such as bolts and nuts.

[0101] The main structure of the connecting fitting protection cover 610 is a rectangular parallelepiped structure with an opening at the bottom. The size of the rectangular parallelepiped matches the size of the connecting fitting 300, and the size of the bottom opening matches the horizontal cross-sectional size of the connecting fitting 300, so that the connecting fitting protection cover 610 can completely cover the connecting fitting 300 from top to bottom, while saving material costs; the connecting fitting protection cover 610 is provided with a plurality of cavities, one of which is arranged corresponding to the second crossarm 200, that is, it is arranged corresponding to the position where the second crossarm 200 extends from the connecting fitting 300, and the remaining cavities are arranged corresponding to the installation positions of the composite crossarm 10, that is, they are arranged corresponding to the first pole connection hole 3111, the fixing hole 3211 and the adjustment hole 3212, the second pole connection hole 3121, and the third pole connection hole, which facilitates the insertion of fasteners and the installation of the composite crossarm 10 while ensuring the insulation effect.

[0102] The main structure of the pole protective cover 620 is a rectangular structure with an opening at the bottom. The size of the rectangular structure matches the size of the top of the pole 20, and the size of the bottom opening matches the horizontal cross-sectional size of the pole 20, so that the pole protective cover 620 can cover the top of the pole 20 from top to bottom while saving material costs; the pole protective cover 620 is provided with a plurality of cavities, which are respectively arranged corresponding to the mounting holes on the pole 20, so as to facilitate the insertion of fasteners and the installation of the composite crossarm 10 while ensuring the insulation effect.

[0103] Furthermore, side openings are provided on the sides of the connecting fitting protective cover 610 and the pole protective cover 620 that are close to each other, and the size of the side openings matches the vertical cross-sectional size of the largest area of ​​the connecting fitting 300, so that the first plate 311 can be installed close to the pole 20, thereby ensuring the connection strength between the connecting fitting 300 and the pole 20, and further ensuring the stable installation of the composite crossarm 10.

[0104] Furthermore, the tops of the connecting fittings protective cover 610 and the pole protective cover 620 are pointed structures, and the tips of the pointed structures are arranged upwards, so that when the protective covers are installed, the pointed structures can prevent birds from standing or staying on the tops of the poles 20 and the connecting fittings 300, further reducing the probability of birds being electrocuted and dying, and protecting biodiversity. The pointed structure can be a conical or pyramidal structure, which is simple in structure and easy to manufacture.

[0105] Furthermore, the insulating protective cover 600 also includes a fastener protective cover 630, which is used to cover fasteners such as nuts that need to be inserted during the installation of the connecting hardware 300 and the pole 20, thereby further improving the coverage rate of the metal structure at the top of the pole 20, thereby further enhancing the insulation effect of the top of the pole 20.

[0106] The insulating protective cover 600 is made of silicone rubber, which has excellent insulating properties and can ensure the insulating effect of the insulating protective cover 600. Alternatively, the insulating protective cover can also be made of other insulating materials, which is not limited here.

[0107] In this embodiment, the insulating protective cover 600 is a split structure, that is, each protective cover is manufactured and installed separately. In other embodiments, the insulating protective cover can also be an integrated structure, as long as it can be installed on the top of the pole and the connecting hardware to achieve the insulation function, there is no limitation here.

[0108] 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: include: A first cross arm, wherein the first cross arm is in an inverted V-shaped structure, and both ends of the first cross arm are respectively used for hanging conductors through tension clamps; Two second cross arms, one end of each of the two 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 length direction of the second cross arm is inclined, the second cross arm is arranged below the first cross arm and is located in the same vertical plane as the first cross arm; Two connecting fittings, the other ends of the two second cross arms are respectively connected to the two sides of the pole through the two connecting fittings; Two tension components, one end of each of the two tension components is respectively connected to the top two sides of the first cross arm, the other end of each of the tension components is used to hang the conductor through a tension wire clamp, and the length direction of each of the tension components is perpendicular to the vertical plane where the first cross arm is located.

2. The composite cross arm according to claim 1, characterized in that: The first cross arm comprises: Two first core rods, the two first core rods are arranged at an angle; Two first intermediate hardwares, wherein the two first intermediate hardwares are respectively connected to the middle parts of the two second cross arms and the two first core rods; A second intermediate hardware, one end of each of the two first core rods is connected to two sides of the second intermediate hardware respectively, and the second intermediate hardware is used to connect the tension component; Two end fittings, the two end fittings are respectively connected to the other ends of the two first core rods, and the end fittings are used to hang the conductor through the tension clamp; A first insulating layer covers at least a portion of an outer circumference of the first core rod.

3. The composite cross arm according to claim 2, characterized in that: The first intermediate hardware 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 a bottom surface of the first intermediate sleeve, and the first intermediate connecting portion is used to connect the second cross arm.

4. The composite cross arm according to claim 2, characterized in that: The second intermediate hardware comprises: a top connection portion, on which a first hanging portion is provided, and the first hanging portion is used to hang a jumper wire through a suspension wire clamp; Two second intermediate sleeves, the two second intermediate sleeves are respectively sleeved on the one ends of the two first core rods, and the two second intermediate sleeves are respectively connected to the two ends of the top connecting portion; Two tension connection parts, the two tension connection parts are arranged on the top side of the top connection part and are symmetrically arranged along the vertical plane where the first cross arm is located, and the tension connection parts are used to connect the tension components.

5. The composite cross arm according to claim 4, characterized in that: The top connecting portion and the two second intermediate sleeves are an integral structure.

6. The composite cross arm according to claim 4, characterized in that: The top connecting part and the second intermediate sleeve are detachably connected via the second intermediate connecting part, and the second intermediate connecting part is arranged at the end of the second intermediate sleeve that is not connected to the first core rod; the top connecting part includes two top connecting plates, and the two top connecting plates clamp and fix the two second intermediate connecting parts, and at least one of the top connecting plates is provided with the first hanging part.

7. The composite cross arm according to claim 4, characterized in that: The tension connection part is a plate-like structure, and a tension connection hole is provided on the tension connection part for connecting the tension component, and the tension component is a tension insulator; Alternatively, the tension connection portion is a tension connection hole, the tension component is a tension hardware, and the tension hardware includes a first connecting plate and a second connecting plate vertically connected, the first connecting plate is used to connect to the top connection portion, and the second connecting plate is used to connect the tension wire clamp.

8. The composite cross arm according to claim 2, characterized in that: The end fitting includes an end sleeve and a second hanging portion, wherein the end sleeve is used to connect the other end of the first core rod, and the second hanging portion is used to hang the conductor through the tension clamp.

9. The composite cross arm according to claim 1, characterized in that: 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, the second hardware fitting connects the other end of the second core rod and the connecting hardware fitting; and a second insulating layer, the second insulating layer covers at least a portion of the outer circumference of the second core rod.

10. The composite cross arm according to claim 1, characterized in that: The connecting fitting comprises a connected pole connecting part and a cross arm connecting part, wherein 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, and the angle between the second cross arm and the pole is adjustable.

11. The composite cross arm according to claim 10, 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 plate is provided with a fixing hole and an adjustment hole, and the fixing hole and the adjustment hole are used to make the angle between the second cross arm and the pole adjustable.

12. The composite cross arm according to claim 10, 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.

13. The composite cross arm according to claim 10, characterized in that: The pole connecting part also includes a third plate for matching and connecting with the pole, the two ends of the third plate are respectively connected to the other ends of the two second plates that are not connected to the first plate, the length of the third plate along the length direction of the pole is less than the length of the second plate, and the third plate is located at the lower part of the second plate.

14. The composite cross arm according to claim 1, characterized in that: The composite cross arm also includes an insulating protective cover, which includes a connecting hardware protective cover and a pole protective cover. The connecting hardware protective cover is used to cover the connecting hardware, and the pole protective cover is used to cover the top of the pole.

15. A transmission pole, characterized in that: It comprises an electric pole and a composite cross arm as claimed in any one of claims 1 to 14, wherein the composite cross arm is fixed on the electric pole.

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