Power transmission tower

Abstract

The utility model discloses a power transmission tower which comprises a tower body which comprises a first tower body and a second tower body which are arranged in a spaced mode. The first composite cross arm assembly comprises two first composite cross arms which are connected with each other, and the first ends of the two first composite cross arms are fixedly connected with the first tower body and the second tower body respectively, so that the first composite cross arm assembly is located between the first tower body and the second tower body; the first composite cross arm assembly further comprises a connecting fitting assembly, the connecting fitting assembly comprises two first end fittings and a wire hanging plate, the first end fittings are fixedly connected to the second ends of the first composite cross arms, and the two first end fittings are connected with each other to achieve mutual connection of the two first composite cross arms. The wire hanging plate is clamped between the two first end part fittings and is used for hanging a middle-phase wire; and the first ends of the two second composite cross arms are fixedly connected with the first tower body and the second tower body respectively, and the second ends of the two second composite cross arms are free ends and are used for hanging side-phase wires.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power transmission, in particular to a power transmission tower. BACKGROUND

[0002] The existing power transmission tower generally adopts a full-steel structure, which has defects such as heavy weight, easy rust or cracking, poor low-temperature performance, difficult transportation, construction and operation and maintenance. At the same time, since the influence of wind deflection angle needs to be considered in the design of the angle steel cross arm, the length of the cross arm is increased, the width of the entire power transmission corridor is increased, and the land occupation area of the entire power transmission line is also increased. Especially in the portal tower, since the length of the porcelain insulator string used is relatively long, the wind deflection is large, so the length of the angle steel cross arm and the height of the tower body need to be increased, which makes the width and height of the traditional portal tower higher, on the one hand, the use of angle steel is increased, the connection of the angle steel is more complex, and the overall cost is increased; on the other hand, the corridor width is increased, the land occupation area of the tower body is increased, which also limits the use of the portal tower in areas where the road right is tight and the ground use is compact. CONTENT OF THE UTILITY MODEL

[0003] In view of the defects of the prior art, the purpose of the present application is to provide a power transmission tower which can be applied to the modification of the existing power grid portal tower and the construction of the newly-built power grid portal tower, the original angle steel cross arm is replaced by a composite cross arm, which can reduce the width of the line corridor, reduce the tower height, and facilitate installation and construction, thereby reducing the cost.

[0004] To solve the above technical problems, the technical scheme adopted by the present application is: a power transmission tower, comprising: a tower body, the tower body comprising a first tower body and a second tower body arranged at intervals; a first composite cross arm assembly, the first composite cross arm assembly comprising two first composite cross arms connected to each other, the first ends of the two first composite cross arms being fixedly connected to the first tower body and the second tower body respectively, so that the first composite cross arm assembly is located between the first tower body and the second tower body; the first composite cross arm assembly further comprises a connecting hardware assembly, the connecting hardware assembly comprising two first end hardware and a wire hanging plate, the first end hardware being fixedly connected to the second end of the first composite cross arm, the two first end hardware being connected to each other to realize the connection of the two first composite cross arms, and the wire hanging plate being clamped between the two first end hardware and used for hanging the middle-phase conductor; two second composite cross arms, the first ends of the two second composite cross arms being fixedly connected to the first tower body and the second tower body respectively, and the second ends being free ends used for hanging the side-phase conductor.

[0005] In an embodiment, the first composite cross arm comprises at least one first support insulator and at least one first inclined cable insulator, the first end of the first support insulator is fixedly connected to the tower body, the first end of the first inclined cable insulator is fixedly connected to the tower body above the first support insulator, and the second end of the first support insulator and the second end of the first inclined cable insulator are fixedly connected to the first end hardware.

[0006] In an embodiment, the second composite cross arm comprises at least one second post insulator and at least one second cable-stayed insulator, a first end of the second post insulator is fixedly connected to the tower body, a first end of the second cable-stayed insulator is fixedly connected to the tower body above the second post insulator, a second end of the second post insulator and a second end of the second cable-stayed insulator are fixedly connected to the second end fitting, a wire hanging hole is arranged on the second end fitting, a wire hanging fitting string is arranged on the wire hanging hole, and the wire hanging fitting string is used for hanging the phase conductor.

[0007] In an embodiment, the wire hanging plate comprises a connecting portion and a wire hanging portion, the connecting portion is used for connecting two first end fittings, and the wire hanging portion is used for hanging the phase conductor.

[0008] In an embodiment, the first end fitting comprises a first flange cylinder and a first sealing plate, the first flange cylinder is sleeved on the second end of the first post insulator, and the first sealing plate covers the first flange cylinder; two first sealing plates of two first end fittings clampingly fix the wire hanging plate; and in the plate surface extension direction of the first sealing plate, the wire hanging plate protrudes the first sealing plate to form the wire hanging portion.

[0009] In an embodiment, the first end fitting further comprises a first cable-stayed connecting plate, the first cable-stayed connecting plate is arranged on the outer peripheral surface of the first flange cylinder and is used for connecting the first cable-stayed insulator.

[0010] In an embodiment, the first end fitting comprises a post connecting plate and a fixed connecting plate, the post connecting plate is used for connecting the first post insulator, and the fixed connecting plate is connected to the post connecting plate perpendicularly; two fixed connecting plates of two first end fittings clampingly fix the wire hanging plate; and in the plate surface extension direction of the fixed connecting plate, the wire hanging plate protrudes the fixed connecting plate to form the wire hanging portion.

[0011] In an embodiment, the first end fitting further comprises a second cable-stayed connecting plate, the second cable-stayed connecting plate is connected to the post connecting plate and the fixed connecting plate simultaneously and is used for connecting the first cable-stayed insulator.

[0012] In an embodiment, a second end of the first composite cross arm is provided with a first grading ring, and a second end of the second composite cross arm is provided with a second grading ring.

[0013] In an embodiment, the tower body is a lattice tower body or a steel pipe pole.

[0014] The beneficial effects of the present application are: 1) saving insulator strings, reducing cross arm length, reducing line corridor width, and at the same time, increasing the height of the conductor to the ground under the condition of the same tower height, so it can be used for upgrading and capacity expansion of the stock power grid; 2) under the condition of the same height of the conductor to the ground, the tower height can be reduced, the steel material and the tower area can be saved, so it can be used for new power grid, and has good economic and social benefits; 3) the connecting structure can be applied to the door-type transmission tower of different voltage grades and different structural types, has strong adaptability, and is convenient for installation, production and construction, and can reduce the engineering cost. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor. Among them:

[0016] Figure 1 is a structural schematic diagram of a transmission tower 10 in an embodiment of the present application;

[0017] Figure 2 is a structural schematic diagram of a connecting hardware assembly 220 in the embodiment of the present application; Figure 1 is an enlarged view of A in the embodiment of the present application;

[0018] Figure 3 is a schematic diagram of a wire hanging plate 222 in an embodiment of the present application;

[0019] Figure 4 is a structural schematic diagram of a transmission tower 10 in another embodiment of the present application;

[0020] Figure 5 is a structural schematic diagram of a connecting hardware assembly 220 in another embodiment of the present application;

[0021] Figure 6 is a schematic diagram of a wire hanging plate 222 in another embodiment of the present application. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0023] Reference is made to Figure 1In an embodiment, the power transmission tower 10 comprises a tower body 100, a first composite cross arm assembly 200 and two second composite cross arms 300, the tower body 100 comprises a first tower body 101 and a second tower body 102 arranged at intervals, and the first tower body 101 and the second tower body 102 are both vertically arranged on the ground; the first composite cross arm assembly 200 is fixedly connected between the first tower body 101 and the second tower body 102, and the two second composite cross arms 300 are respectively located on a side of the first tower body 101 away from the second tower body 102 and a side of the second tower body 102 away from the first tower body 101.

[0024] The first composite cross arm assembly 200 comprises two first composite cross arms 210 connected with each other, the first ends of the two first composite cross arms 210 are respectively fixedly connected with the first tower body 101 and the second tower body 102, so that the first composite cross arm assembly 200 is located between the first tower body 101 and the second tower body 102, the second ends of the two first composite cross arms 210 are connected with each other, and the connection part of the two first composite cross arms 210 forms a first wire hanging point for hanging a middle-phase conductor. The first ends of the two second composite cross arms 300 are respectively fixedly connected with the first tower body 101 and the second tower body 102, and the second composite cross arms 300 are located on the same horizontal height as the first composite cross arms 210 on the first tower body 101 or the second tower body 102 and are located on opposite sides. The second ends of the two second composite cross arms 300 are both free ends, and form a second wire hanging point and a third wire hanging point for hanging a side-phase conductor.

[0025] The application forms three wire hanging points on the power transmission tower 10 by arranging the first composite cross arm assembly 200 and the two second composite cross arms 300, so that the power transmission tower 10 can hang three-phase conductors. Preferably, the first wire hanging point, the second wire hanging point and the third wire hanging point are located at the same horizontal height, so that the power transmission tower 10 can hang three-phase conductors at the same horizontal height. In the embodiment, the tower body 100 is a steel pipe pole with a circular cross section, and in other embodiments, the tower body can also be a lattice angle steel tower body, a composite material pole tower or other common structures of power transmission towers.

[0026] In combination Figure 2 In order to facilitate the connection of the two first composite cross arms 210 and also facilitate the hanging of the conductors, the first composite cross arm assembly 200 further comprises a connecting hardware assembly 220, the connecting hardware assembly 220 comprises two first end hardware 221 and a wire hanging plate 222, the two first end hardware 221 are respectively fixedly connected with the second ends of the two first composite cross arms 210, and the two first end hardware 221 are connected with each other to realize the connection of the two first composite cross arms 210. At the same time, the wire hanging plate 222 is clamped between the two first end hardware 221, the wire hanging plate 222 forms a first wire hanging point for hanging a middle-phase conductor.

[0027] In the embodiment, taking the structure on the first tower body 101 as an example, the first composite cross arm 210 comprises a first post insulator 211 and a first cable-stayed insulator 212, the first end of the first post insulator 211 is fixedly connected to the first tower body 101, the first end of the first cable-stayed insulator 212 is fixedly connected to the first tower body 101 above the first post insulator 211, and the second ends of the first post insulator 211 and the first cable-stayed insulator 212 are fixedly connected to the first end fitting 221. The first end of the first post insulator 211 and the first end of the first cable-stayed insulator 212 are connected to different positions of the first tower body 101, and the first end of the first post insulator 211 and the first end of the first cable-stayed insulator 212 are located on the same vertical line, at this time, the first composite cross arm 210 and the first tower body 101 form a stable triangular structure, which can ensure the stability of the first composite cross arm 210. The second ends of the first post insulator 211 and the first cable-stayed insulator 212 are connected together through the first end fitting 221. The first cable-stayed insulator 212 can offset part of the vertical downward force of the end of the first post insulator 211, reduce the load of the first post insulator 211 in the vertical direction, and be conducive to improving the overall bending strength of the first post insulator 211. The structure on the second tower body 102 is the same as that on the first tower body 101, and details are not described again.

[0028] The first post insulator 211 and the first cable-stayed insulator 212 are both made of composite materials, have the advantages of simple structure, convenient installation, good insulation performance and the like, and both comprise an insulator in the inside and a rubber umbrella skirt wrapped outside the insulator. The insulator can be an insulating tube or an insulating core rod, the insulating tube can be a glass fiber impregnated epoxy resin wound and solidified glass steel tube or a aramid fiber impregnated epoxy resin wound aramid tube, and the insulating core rod can be a glass fiber or aramid fiber impregnated epoxy resin pultrusion or winding solid core rod, and the rubber umbrella skirt can be made of high temperature vulcanized silicone rubber or other forms of rubber material. The structure and material of the first post insulator 211 and the first cable-stayed insulator 212 are not limited in the application.

[0029] In the embodiment, the axes of the two first post insulators 211 of the two first composite cross arms 210 are located on the same line, i.e., the axes of the two first post insulators 211 are located in the same horizontal plane. In other embodiments, the axes of the two first post insulators of the two first composite cross arms can also not be located on the same line, i.e., the axes of the two first post insulators of the two first composite cross arms form a fixed included angle. The first composite cross arm can also include two or more first post insulators and two or more first diagonal insulators to achieve better stress, which is not limited herein as long as the stress requirement can be met and the wires can be hung.

[0030] The first end fitting 221 includes a first flange cylinder 2211 and a first sealing plate 2212. The first flange cylinder 2211 is provided in a hollow structure along the axial direction and is sleeved on the second end of the first post insulator 211. The first sealing plate 2212 covers the end of the first flange cylinder 2211 away from the first post insulator 211 to prevent water vapor, impurities, etc. from entering the inside of the first post insulator 211. The second ends of the two first post insulators 211 are clamped on the wire hanging plate 222 through the two first sealing plates 2212 and then fasteners are arranged to connect the two first post insulators 211 to each other, and then the two first composite cross arms 210 are connected to each other.

[0031] The first sealing plate 2212 is a plate member, and two plate surfaces of the first sealing plate 2212 arranged oppositely are fixedly connected with the first flange cylinder 2211 and the wire hanging plate 222, respectively. In order to facilitate the connection between the first sealing plate 2212 and the wire hanging plate 222, in the radial direction of the first flange cylinder 2211, the length of the first sealing plate 2212 is greater than the outer diameter of the cylinder body of the first flange cylinder 2211, i.e., in the extension direction of the wire, the plate body of the first sealing plate 2212 extends outward from the outer wall of the first flange cylinder 2211.

[0032] The wire hanging plate 222 comprises a connecting portion 223 and a wire hanging portion 224, the connecting portion 223 is used for connecting the two first end portion fittings 221, and the wire hanging portion 224 is used for hanging the phase conductor. In the embodiment, the connecting portion 223 is a middle plate body of the wire hanging plate 222, that is, a partial plate body adhered to the first sealing plate 2212, and a plurality of first connecting holes 2231 are arranged on the connecting portion 223, the first connecting holes 2231 penetrate the plate surface of the wire hanging plate 222, and the plurality of first connecting holes 2231 are uniformly distributed around the center of the wire hanging plate 222. A plurality of second connecting holes 22121 matched with the plurality of first connecting holes 2231 are arranged on the first sealing plate 2212, the wire hanging plate 222 is inserted between the two first sealing plates 2212, the first connecting holes 2231 and the second connecting holes 22121 are correspondingly matched and then a fastener is arranged to penetrate, so that the wire hanging plate 222 is fixedly connected with the two first sealing plates 2212, and then the wire hanging plate 222 is clamped and fixed between the two first end portion fittings 221. In other embodiments, the structure, number and arrangement position of the connecting portion can be designed according to different structures of the first end portion fitting, which is not limited here.

[0033] Continuing to refer to Figure 2 and Figure 3 In the plate surface extension direction of the first sealing plate 2212, that is, the extension direction of the conductor, the wire hanging plate 222 protrudes from the first sealing plate 2212, and the protruding part is the wire hanging portion 224. In the embodiment, the wire hanging plate 222 is a rhombus plate with rounded corners, the first sealing plate 2212 is a hexagonal plate, the shape and size of the wire hanging plate 222 are basically consistent with those of the sealing plate 2212, but in the extension direction of the conductor, the wire hanging plate 222 protrudes from the center to both sides. Specifically, the dashed line L1 and the dashed line L2 are projections of the outer periphery of the first sealing plate 2212 on the wire hanging plate 222, the dashed line L1 and the dashed line L2 do not actually exist, and are only used for convenient description. The wire hanging portion 224 of the wire hanging plate 222 is the part formed by the dashed line L1, the dashed line L2 and the edge line of the wire hanging plate 222, that is, the part protruding from the first sealing plate 2212. In other embodiments, the first sealing plate can be a circular plate or a special-shaped plate, and correspondingly, the wire hanging plate can also be of other shapes or other structures, as long as the connection structure of the first sealing plate and the wire hanging plate can conveniently hang the conductor, which is not limited here.

[0034] In the embodiment, the number of the wire hanging portion 224 is two, the two wire hanging portions 224 are arranged on both sides of the wire hanging plate 222 along the extension direction of the conductor, a wire hanging hole 2241 is arranged in the middle of each of the two wire hanging portions 224, and the two wire hanging holes 2241 are symmetrical about the symmetry axis of the wire hanging plate 222. A wire hanging fitting string is arranged in each of the two wire hanging holes 2241 to hang the conductor, so that the first composite cross arm assembly 200 is balanced in overall stress, the hung conductor is more stable, and the safety is higher.

[0035] It can be understood that, since the wire hanging plate 222 provides two wire hanging holes 2241 for setting two wire hanging fitting strings, when one of the wire hanging fitting strings breaks, the other wire hanging fitting string can still continue to hang the conductor, thereby preventing the conductor from falling and causing an accident. In other embodiments, the wire hanging hole can also be provided as one, three or more, can be located at other positions of the wire hanging plate, the number of wire hanging parts can also be one, three or more, can be formed by the wire hanging plate protruding downward from the first sealing plate in the vertical direction, or can be other structural forms, as long as the mechanical strength of the conductor can be met, which is not limited here.

[0036] The setting of the wire hanging plate 222 can facilitate the matching installation of the first end fitting 221 for different structures, and by changing the shape of the wire hanging plate 222, the position and number of the wire hanging hole 2241 can adapt to different wire hanging needs, thereby increasing the application range of the power transmission tower 10. In other embodiments, the wire hanging plate can also not be provided, and the first end fitting can be directly used to hang the conductor, for example, a through hole is provided on the first sealing plate of two connected first end fittings, a connecting fitting such as a U-shaped hanging ring is passed through the corresponding through hole, and a wire clamp or other wire hanging fitting is connected to hang the conductor, or other ways can be used to connect the wire hanging fitting, as long as the wire hanging needs can be met.

[0037] The first end fitting 221 further comprises a first inclined pull connecting plate 2213, which is arranged on the outer circumferential surface of the first flange cylinder 2211 and is used to connect the first inclined pull insulator 212. The first inclined pull connecting plate 2213 is connected with the outer circumference of the first flange cylinder 2211 and the first sealing plate 2212 at the same time, thereby strengthening the structural stability of the first end fitting 221 as a whole. In the present embodiment, the number of the first inclined pull connecting plate 2213 is one, and one first inclined pull connecting plate 2213 is provided with one inclined pull connecting hole for connecting the first inclined pull insulator 212. In other embodiments, the number of the first inclined pull connecting plate and the inclined pull connecting hole can also be two or more, which are used to match other numbers of the first inclined pull insulator, which is not limited here.

[0038] Continuing to refer to Figure 1 Taking the structure on the first tower body 101 as an example, the second composite cross arm 300 comprises a second support insulator 311 and a second inclined pull insulator 312. The first end of the second support insulator 311 is fixedly connected to the first tower body 101, and the first end of the second inclined pull insulator 312 is fixedly connected to the first tower body 101 above the second support insulator 311. The second end of the second support insulator 311 and the second end of the second inclined pull insulator 312 are fixedly connected to a second end fitting 313. The wire hanging hole is provided on the second end fitting 313, and the wire hanging fitting string is provided on the wire hanging hole, which is used to hang the phase conductor.

[0039] The first end of the second post insulator 311 and the first end of the second diagonal insulator 312 are connected to different positions of the first tower body 101, and the first end of the second post insulator 311 and the first end of the second diagonal insulator 312 are located on the same vertical line, at this time, the second composite cross arm 300 presents a stable triangular structure, which can ensure the stability of the second composite cross arm 300. The second end of the second post insulator 311 and the second end of the second diagonal insulator 312 are connected together through the second end fitting 313. The setting of the second diagonal insulator 312 can offset part of the vertical downward force of the end of the second post insulator 311, reduce the load of the second post insulator 311 in the vertical direction, and be conducive to improving the overall bending strength of the second post insulator 311. The structure on the second tower body 102 is the same as that on the first tower body 101, and details are not repeated.

[0040] The structure and material of the second post insulator 311 are similar to those of the first post insulator 211, and the structure and material of the second diagonal insulator 312 are similar to those of the first diagonal insulator 212, and details are not repeated. In other embodiments, the second composite cross arm can also include two or more second post insulators and two or more second diagonal insulators to achieve better stress, which is not limited here, as long as the stress requirement can be met and the wire can be hung.

[0041] In the present embodiment, the first composite cross arm 210 and the second composite cross arm 300 are respectively arranged on both sides of the first tower body 101 or the second tower body 102, the axes of the first post insulator 211 and the second post insulator 311 are located on the same straight line, and the number of the first post insulator 211 is the same as that of the second post insulator 311, and the number of the first diagonal insulator 212 is the same as that of the second diagonal insulator 312. In other embodiments, the axes of the first post insulator and the second post insulator can also not be located on the same straight line, that is, the axes of the first post insulator and the second post insulator form a fixed included angle, and the number of the first post insulator 211 and the number of the second post insulator 311 can also be different, and the number of the first diagonal insulator 212 and the number of the second diagonal insulator 312 can also be different. This is not limited here, as long as the wire can be hung and the stress requirement can be met.

[0042] The second end fitting 313 includes a second flange cylinder and a second cover plate. The second flange cylinder is arranged in a hollow structure along the axial direction and is sleeved at the second end of the second post insulator 311. The second cover plate covers the end of the second flange cylinder away from the second post insulator 311 to prevent water vapor, impurities and the like from entering the inside of the second post insulator 311. It can be understood that, since the second end fitting 313 does not need to be hung with the conductor by connecting the hanging wire plate 222, but can directly set the hanging wire hole to hang the conductor, the second cover plate of the second end fitting 313 can be of any shape. In the embodiment, the second cover plate is a rhombic plate, and in order to facilitate the setting of the hanging wire hole, in the radial direction of the second flange cylinder, the length of the second cover plate is greater than the outer diameter of the cylinder body of the second flange cylinder, that is, in the radial direction of the second flange cylinder, the plate body of the second cover plate extends outward from the outer wall of the second flange cylinder, and the two hanging wire holes are arranged at the two ends of the second cover plate along the conductor extension direction, so that after the conductor is hung, the overall stress of the second composite cross arm 300 is balanced, the hung conductor is more stable, and the safety is higher.

[0043] It can be understood that, since the second cover plate provides two hanging wire holes for setting two hanging wire fitting strings, when one of the hanging wire fitting strings breaks, the other hanging wire fitting string can still continue to hang the conductor, thereby preventing the conductor from falling and causing an accident. In other embodiments, the hanging wire hole can also be one, three or more, and the hanging wire hole can also be located at other positions of the second cover plate, such as being provided with one hanging wire hole at the lower end of the second cover plate, as long as the mechanical strength requirement of the conductor hanging can be met, which is not limited herein.

[0044] The second end of the first composite cross arm 210 is provided with a first equalizing ring 401, and the second end of the second composite cross arm 300 is provided with a second equalizing ring 402. In the embodiment, the number of the first equalizing ring 401 is two, one of which is arranged around the second end of the first post insulator 211, and the other of which is arranged around the second end of the first inclined pull insulator 212; the number of the second equalizing ring 402 is also two, one of which is arranged around the second end of the second post insulator 311, and the other of which is arranged around the second end of the second inclined pull insulator 312. The arrangement of the first equalizing ring 401 and the second equalizing ring 402 can ensure that the electrical performance of the end of the first composite cross arm 210 and the second composite cross arm 300 is good. In other embodiments, the number and arrangement position of the first equalizing ring and the second equalizing ring can also be designed according to actual needs, which is not limited herein.

[0045] In another embodiment, referring to Figure 4, the tower body 100 is a lattice iron tower made of steel to ensure the overall mechanical strength of the power transmission tower 10. Taking the structure on the first tower body 101 as an example, the first composite cross arm 210 includes two first post insulators 211 and a first diagonal insulator 212. The first ends of the two first post insulators 211 are fixedly connected to the first tower body 101, and the first end of the first diagonal insulator 212 is fixedly connected to the first tower body 101 above the first post insulators 211. The second ends of the two first post insulators 211 and the first diagonal insulator 212 are fixedly connected to the first end fitting 221. The arrangement of the two first post insulators 211 and the first diagonal insulator 212 forms a stable triangular pyramid structure between the first composite cross arm 210 and the first tower body 101, which greatly improves the stability of the first composite cross arm 210. At this time, the first composite cross arm 210 and the first tower body 101 form a stable triangular structure, which can ensure the stability of the first composite cross arm 210. The arrangement of the first diagonal insulator 212 can offset part of the vertical downward force at the end of the first post insulator 211, reduce the vertical load of the first post insulator 211, and improve the overall bending strength of the first post insulator 211. The structure on the second tower body 102 is the same as that on the first tower body 101, and details are not repeated here.

[0046] The structure and material of the first post insulator 211 and the first diagonal insulator 212 are as described above and will not be repeated here. In other embodiments, the first composite cross arm can also include two or more first post insulators and two or more first diagonal insulators to achieve better stress, which is not limited here as long as it can meet the stress requirement and adapt to the hanging of the conductor.

[0047] In combination Figure 5 and Figure 6 , the connecting fitting assembly 220 includes two first end fittings 221 and a wire hanging plate 222. The two first end fittings 221 are fixedly connected to the second ends of the two first composite cross arms 210, respectively, and the two first end fittings 221 are connected to each other to realize the mutual connection of the two first composite cross arms 210. At the same time, the wire hanging plate 222 is clamped between the two first end fittings 221, and the first wire hanging point is formed on the wire hanging plate 222 for hanging the phase conductor.

[0048] The first end fitting 221 comprises a post connecting plate 2214 and a fixing connecting plate 2215, the post connecting plate 2214 is used for connecting the first post insulator 211, and the fixing connecting plate 2215 is connected with the post connecting plate 2214 perpendicularly. A plurality of post connecting holes are arranged on the post connecting plate 2214, and are used for connecting the first post insulator 211. Since the number of the first post insulator 211 is two, the plurality of post connecting holes are uniformly distributed on both sides of the post connecting plate 2214, so that the stress on the post connecting plate 2214 is balanced, and the service life of the first end fitting 221 is prolonged. The two first composite cross arms 210 are connected with each other by clamping the wire hanging plate 222 between the two fixing connecting plates 2215 and then penetrating a fastener, and then the first composite cross arm assembly 200 is formed.

[0049] The fixing connecting plate 2215 is a rectangular plate, and the fixing connecting plate 2215 comprises two plate surfaces arranged oppositely, one of which is connected with the post connecting plate 2214 perpendicularly, and the other is connected with the wire hanging plate 222.

[0050] The wire hanging plate 222 comprises a connecting portion 223 and a wire hanging portion 224, the connecting portion 223 is used for connecting the two first end fittings 221, and the wire hanging portion 224 is used for hanging the phase conductor. In the embodiment, the connecting portion 223 is an upper part plate body of the wire hanging plate 222, that is, a part plate body which is attached to the fixing connecting plate 2215, and a plurality of first connecting holes 2231 are arranged on the connecting portion 223, the first connecting holes 2231 penetrate the plate surface of the wire hanging plate 222, and the plurality of first connecting holes 2231 are uniformly distributed on the plate surface of the wire hanging plate 222. A plurality of second connecting holes 22121 which are matched with the plurality of first connecting holes 2231 are arranged on the fixing connecting plate 2215, the wire hanging plate 222 is inserted between the two fixing connecting plates 2215, a fastener is penetrated after the first connecting holes 2231 and the second connecting holes 22121 are matched, so that the wire hanging plate 222 is fixedly connected with the two fixing connecting plates 2215, and then the wire hanging plate 222 is clamped and fixed between the two first end fittings 221. In other embodiments, the structure, number and arrangement position of the connecting portion can be designed according to different structures of the first end fitting, which is not limited herein.

[0051] In the plate surface extension direction of the fixing connecting plate 2215, specifically Figure 5In the vertical downward direction shown, the wire hanging plate 222 protrudes from the fixed connection plate 2215, and the protruding part is the wire hanging part 224. In this embodiment, the wire hanging plate 222 is a T-shaped plate, and the fixed connection plate 2215 is a rectangular plate. The shape and size of the fixed connection plate 2215 are generally consistent with those of the wire hanging plate 222, except that the wire hanging plate 222 protrudes downward from the center in the vertical direction. Specifically, the dashed line L3 is the projection of the outer periphery of the fixed connection plate 2215 on the wire hanging plate 222. The dashed line L3 does not actually exist, but is used here for convenience of description. The wire hanging part 224 of the wire hanging plate 222 is the part formed by the dashed line L3 and the edge of the wire hanging plate 222, i.e., the part of the wire hanging plate 222 that protrudes from the fixed connection plate 2215. In other embodiments, the fixed connection plate can be a circular plate or a plate with a special shape. Correspondingly, the wire hanging plate can also have other shapes or structures, as long as the connection structure of the fixed connection plate and the wire hanging plate facilitates the hanging of the conductor, and is not limited in this regard.

[0052] In this embodiment, the number of wire hanging parts 224 is one, and the wire hanging part 224 is located at the lower end of the wire hanging plate 222 in the direction shown. Figure 6 In the direction shown, the wire hanging part 224 has a wire hanging hole 2241 in the middle, and a wire hanging fitting string is arranged in the wire hanging hole 2241 to hang the conductor. In other embodiments, the wire hanging hole can be one, three or more, and can be located at other positions of the wire hanging plate. The number of wire hanging parts can also be one, three or more, and can be formed by the wire hanging plate protruding from the fixed connection plate in the horizontal direction, or can have other structural forms, as long as the mechanical strength of the conductor meets the requirements, and is not limited in this regard.

[0053] The arrangement of the wire hanging plate 222 can facilitate the matching installation of the first end fitting 221 with different structures. By changing the shape of the wire hanging plate 222 and the position and number of the wire hanging hole 2241, different wire hanging requirements can be met, and the application range of the power transmission tower 10 is increased. In other embodiments, the wire hanging plate can not be provided, and the first end fitting can be directly used to hang the conductor. For example, through holes are arranged on the fixed connection plates of two first end fittings connected to each other, a U-shaped hanging ring or other connecting fitting is passed through the corresponding through holes, and a wire clamp or other wire hanging fitting is connected to hang the conductor. Other ways of connecting the wire hanging fitting can also be used, as long as the wire hanging requirements are met.

[0054] The first end fitting 221 also includes a second inclined tie plate 2216, which connects both the post connecting plate 2214 and the fixing connecting plate 2215, and is used to connect the first inclined tie insulator 212. In this embodiment, there is one second inclined tie connecting plate 2216, which has an inclined tie connection hole for connecting the first inclined tie insulator 212. In other embodiments, the number of second inclined tie connecting plates and inclined tie connection holes can be set to two or more to match other numbers of first inclined tie insulators, and this is not limited here.

[0055] Continue reading Figure 4 Taking the structure on the first tower body 101 as an example, the second composite crossarm 300 includes two second post insulators 311 and one second inclined insulator 312. The first ends of the two second post insulators 311 are fixedly connected to the first tower body 101, and the first end of the second inclined insulator 312 is fixedly connected to the first tower body 101 above the second post insulators 311. The second ends of the two second post insulators 311 and the second inclined insulator 312 are fixedly connected to a second end fitting 313. A wire-hanging hole is provided on the second end fitting 313, and a string of wire-hanging fittings is provided on the wire-hanging hole for connecting the phase conductor. The arrangement of the two second post insulators 311 and the second inclined insulator 312 makes the second composite crossarm 300 and the first tower body 101 form a stable triangular pyramid structure, which can greatly improve the stability of the second composite crossarm 300. The structure on the second tower body 102 is the same as that on the first tower body 101, and will not be described in detail here.

[0056] The structure and materials of the second post insulator 311 and the second inclined insulator 312 are as described above and will not be repeated here. In other embodiments, the second composite crossarm may also include two or more second post insulators and two or more second inclined insulators to achieve better stress distribution. This is not a limitation, as long as the stress requirements are met and the conductor connection is suitable.

[0057] In this embodiment, the first composite crossarm 210 and the second composite crossarm 300 are respectively disposed on both sides of the first tower body 101 or the second tower body 102. The number of first post insulators 211 and second post insulators 311 are the same, and the number of first inclined insulators 212 and second inclined insulators 312 are the same. In other embodiments, the number of first post insulators and first inclined insulators may differ from the number of second post insulators and second inclined insulators; this is not limited, as long as it can accommodate the connection of the conductors and meet the stress requirements.

[0058] The structure of the second end fitting 313 is similar to that of the first end fitting 221, and will not be described in detail here.

[0059] The second end of the first composite cross arm 210 is provided with a first equalizing ring 401, and the second end of the second composite cross arm 300 is provided with a second equalizing ring 402. In the embodiment, the number of the first equalizing rings 401 is three, two of which are respectively arranged around the second ends of the two first post insulators 211, and the other one is arranged around the second end of the first inclined stay insulator 212; the number of the second equalizing rings 402 is also three, two of which are respectively arranged around the second ends of the two second post insulators 311, and the other one is arranged around the second end of the second inclined stay insulator 312. The arrangement of the first equalizing rings 401 and the second equalizing rings 402 can ensure that the electrical performance of the end of the first composite cross arm 210 and the second composite cross arm 300 is good. In other embodiments, the number and arrangement position of the first equalizing rings and the second equalizing rings can also be designed according to actual needs, which are not limited herein.

[0060] It should be noted that, although the above is described by taking the embodiment that the first composite cross arm 210 includes two first post insulators 211 and one first inclined stay insulator 212, and the second composite cross arm 300 also includes two second post insulators 311 and one second inclined stay insulator 312, it is also applicable to other embodiments, such as the first composite cross arm including two first post insulators and two first inclined stay insulators, and the second composite cross arm also including two second post insulators and two second inclined stay insulators.

[0061] The beneficial effects of the present application are: 1) saving insulator strings, reducing the length of cross arms, and reducing the width of the line corridor, and at the same time, due to the increase of the height of the wire to the ground under the condition of the same tower height, it can be used for the voltage increase and capacity expansion reconstruction of the stock power grid; 2) due to the reduction of the tower height under the condition of the same height of the wire to the ground, the steel and the tower area are saved, so it can be used for the new power grid, and has good economic and social benefits; 3) the connection structure can be applied to the portal transmission tower of different voltage grades and different structural types, has strong adaptability, and is convenient for installation, production and construction, and can reduce the engineering cost.

[0062] The above only describes the embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A power transmission tower, characterized in that, The power transmission tower comprises: a tower body comprising a first tower body and a second tower body arranged at intervals; a first composite cross arm assembly comprising two first composite cross arms connected to each other, the first ends of the two first composite cross arms being fixedly connected to the first tower body and the second tower body respectively, so that the first composite cross arm assembly is located between the first tower body and the second tower body; the first composite cross arm assembly further comprises a connecting hardware assembly, the connecting hardware assembly comprising two first end hardware and a wire hanging plate, the first end hardware being fixedly connected to the second end of the first composite cross arm, the two first end hardware being connected to each other to realize the connection of the two first composite cross arms, and the wire hanging plate being clamped between the two first end hardware for hanging the middle phase conductor; two second composite cross arms, the first ends of the two second composite cross arms being fixedly connected to the first tower body and the second tower body respectively, and the second ends being free ends for hanging the side phase conductor.

2. The power transmission tower of claim 1, wherein, The first composite cross arm comprises at least one first post insulator and at least one first cable-stayed insulator, the first end of the first post insulator being fixedly connected to the tower body, the first end of the first cable-stayed insulator being fixedly connected to the tower body above the first post insulator, and the second end of the first post insulator and the second end of the first cable-stayed insulator being fixedly connected to the first end hardware.

3. The power transmission tower of claim 1, wherein, The second composite cross arm comprises at least one second post insulator and at least one second cable-stayed insulator, the first end of the second post insulator being fixedly connected to the tower body, the first end of the second cable-stayed insulator being fixedly connected to the tower body above the second post insulator, and the second end of the second post insulator and the second end of the second cable-stayed insulator being fixedly connected to the second end hardware, the wire hanging hole being provided on the second end hardware, and the wire hardware string being provided on the wire hanging hole for hanging the side phase conductor.

4. The power transmission tower of claim 2, wherein, The wire hanging plate comprises a connecting portion and a wire hanging portion, the connecting portion being used for connecting the two first end hardware, and the wire hanging portion being used for hanging the middle phase conductor.

5. The power transmission tower of claim 4, wherein, The first end hardware comprises a first flange cylinder and a first sealing plate, the first flange cylinder being sleeved on the second end of the first post insulator, and the first sealing plate covering the first flange cylinder; the two first sealing plates of the two first end hardware clamping and fixing the wire hanging plate; wherein, in the plate surface extension direction of the first sealing plate, the wire hanging plate protrudes out of the first sealing plate to form the wire hanging portion.

6. The power transmission tower of claim 5, wherein, The first end hardware further comprises a first cable-stayed connecting plate, the first cable-stayed connecting plate being provided on the outer circumferential surface of the first flange cylinder for connecting the first cable-stayed insulator.

7. The power transmission tower of claim 4, wherein, The first end fitting comprises a support connecting plate for connecting the first support insulator and a fixed connecting plate connected perpendicularly to the support connecting plate; the fixed connecting plates of the two first end fittings clasp and fix the wire hanging plate; wherein the wire hanging plate protrudes from the fixed connecting plate in the plate surface extension direction of the fixed connecting plate to form the wire hanging part.

8. The power transmission tower of claim 7, wherein, The first end fitting further comprises a second diagonal pull connecting plate simultaneously connected to the support connecting plate and the fixed connecting plate for connecting the first diagonal pull insulator.

9. The power transmission tower of claim 1, wherein, The second end of the first composite cross arm is provided with a first grading ring, and the second end of the second composite cross arm is provided with a second grading ring.

10. The power transmission tower of claim 1, wherein, The tower body is a lattice tower body or a steel pipe pole.

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