Power transmission tower

Abstract

Provided in the present application is a power transmission tower, comprising a tower body and a composite cross arm arranged on the tower body. The composite cross arm comprises a post insulator, a diagonal tension insulator and a node fitting, wherein low-voltage ends of the post insulator and the diagonal tension insulator are both connected to the tower body, and high-voltage ends thereof are connected together by means of the node fitting. The node fitting comprises two clamping plates arranged in parallel with each other, the post insulator and the diagonal tension insulator both being inserted between the two clamping plates by means of connecting fittings, such that the post insulator and the diagonal tension insulator are connected to the node fitting. Each clamping plate is provided with a wire hanging hole for hanging a conductive wire. By means of the described design, the node fitting can be designed to be more compact, whilst having better bending moment resistance.

Description

transmission towers Technical Field

[0001] The present application relates to the field of power transmission technology, and in particular to a power transmission tower. Background Art

[0002] In transmission towers, node fittings usually connect insulators and hanging wires. However, current node fittings are complex in structure and occupy a large space, which is not conducive to construction and maintenance. In addition, to ensure safety under extreme working conditions, excessive design redundancy is set for node fittings, which reduces economic efficiency.

[0003] Summary of the Invention

[0004] In view of this, the present application provides a transmission tower that can make the node hardware structure simple, easy to process and with clear force transmission, can match any number of conductor splits and hanging points, and has good bending moment resistance.

[0005] In order to solve the above problems, the present application provides a transmission tower, including a tower body and a composite crossarm arranged on the tower body, the composite crossarm including a post insulator, a diagonal insulator and a node hardware, the low-voltage ends of the post insulator and the diagonal insulator are connected to the tower body, and the high-voltage ends are connected together through a node hardware, the node hardware includes two clamping plates arranged parallel to each other, the post insulator and the diagonal insulator are inserted between the two clamping plates through a connecting hardware, so that the post insulator and the diagonal insulator are connected to the node hardware, and the clamping plate is provided with a wire hanging hole for hanging wires.

[0006] Among them, the high-voltage end of the support insulator is provided with a first connecting hardware, which includes: a flange tube, which is arranged as a hollow structure along the axial direction; a sealing plate, which covers the end of the flange tube away from the support insulator; and an insert plate, which is arranged on the side of the sealing plate away from the flange tube, and the insert plate is perpendicular to the sealing plate.

[0007] Among them, a first connecting hole is set on the plug-in plate, and a second connecting hole is set on the two clamping plates. The plug-in plate is inserted between the two clamping plates. After the first connecting hole corresponds to the second connecting hole, a fastener is passed through to fix the first connecting hardware and the node hardware.

[0008] Among them, the high-voltage end of the inclined insulator is provided with a second connecting hardware, the second connecting hardware is a plate, the second connecting hardware is provided with a third connecting hole, and the fourth connecting holes are provided on the two clamping plates. The second connecting hardware is inserted between the two clamping plates, and the third connecting hole corresponds to the fourth connecting hole and a fastener is passed through to fix the second connecting hardware to the node hardware.

[0009] Among them, the high-voltage end of the composite cross arm is provided with a high-voltage end arcing assembly, and the low-voltage end of the composite cross arm is provided with a low-voltage end arcing assembly. The high-voltage end arcing assembly and the low-voltage end arcing assembly form the shortest electrical gap on the composite cross arm.

[0010] Among them, the high-voltage end arcing assembly includes a first arcing ball and a first arcing rod. One end of the first arcing rod is connected to the high-voltage end of the composite crossarm, and the other end is connected to the first arcing ball. The first arcing ball serves as the arcing end of the high-voltage end arcing assembly.

[0011] Among them, the low-voltage end arcing assembly includes a first arcing ring and a second arcing rod. The first arcing ring is provided with a first notch. One end of the second arcing rod is connected to the first arcing ring at the first notch, and the other end is bent in the direction away from the first arcing ring. The end of the second arcing rod away from the first arcing ring serves as the arcing end of the low-voltage end arcing assembly.

[0012] Among them, the high-voltage end arcing assembly includes a second arcing ring, a second arcing ball and a connecting bracket. The second arcing ring and the second arcing ball are connected to the composite crossarm through the connecting bracket. The second arcing ring is provided with a second notch. The second arcing ball is located at the second notch and serves as the arcing end of the high-voltage end arcing assembly.

[0013] The transmission tower further comprises: a first hinge connecting the low-voltage end of the support insulator and the tower body so that the support insulator can rotate relative to the tower body; a second hinge connecting the low-voltage end of the inclined insulator and the tower body so that the inclined insulator can rotate relative to the tower body.

[0014] The tower body includes: a tower body; a first support frame and a second support frame, which are protruded on the same side wall of the tower body. The first support frame is connected to the low-voltage end of the post insulator, and the second support frame is connected to the low-voltage end of the inclined insulator.

[0015] Among them, the two outer plate surfaces facing each other of the two plywood are respectively connected with fixing plates, and the fixing plates are provided with construction holes for the construction and maintenance of the composite crossarm.

[0016] Among them, the two outer plate surfaces facing each other of the two splints are respectively connected with fixed plates, and auxiliary connecting parts are provided on the fixed plates. The auxiliary connecting parts are provided with construction holes for the construction and maintenance of the composite crossarm.

[0017] The auxiliary connecting piece is a T-shaped plate, and the auxiliary connecting piece is detachably connected to the fixed plate.

[0018] Wherein, reinforcing ribs are provided between the outer plate surface of the splint and the two plate surfaces opposite to the fixed plate.

[0019] Beneficial Effects: This application utilizes two plywood plates to form a node fitting, which not only meets practical requirements but also makes the design of the node fitting more compact and avoids design redundancy. Furthermore, compared to a node fitting composed of a single flat plate of the same total thickness, the node fitting of this application has a larger cross-sectional modulus about the neutral axis, providing greater resistance to bending moments and extending the service life of the node fitting.

[0020] Furthermore, the arrangement of the first hinge and the second hinge allows the composite cross arm to rotate relative to the tower body, thereby releasing excessive unbalanced tension through rotation, protecting the tower body and preventing the tower body from being damaged.

[0021] In addition, the provision of fixed plates and auxiliary connectors can facilitate the operation, maintenance and construction of the composite crossarms, and also ensure that the structure of the node hardware itself is not interfered with and remains stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0023] FIG1 is a schematic structural diagram of an embodiment of a transmission tower of the present application;

[0024] Figure 2 is a schematic diagram of the structure of the composite cross arm in Figure 1

[0025] FIG3 is a schematic structural diagram of the node hardware in FIG1 ;

[0026] FIG4 is a schematic structural diagram of the first connecting fitting in FIG2 ;

[0027] FIG5 is a schematic structural diagram of another embodiment of the transmission tower of the present application;

[0028] FIG6 is an enlarged schematic diagram of point A in FIG5 . DETAILED DESCRIPTION

[0029] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0030] Referring to FIG. 1 , the present application provides a transmission tower 10 , which includes a tower body 100 and a composite crossarm 200 disposed on the tower body 100 . The composite crossarm 200 includes a post insulator 210 , a diagonal insulator 220 , and a node hardware 230 . The low-voltage ends of the post insulator 210 and the diagonal insulator 220 are both connected to the tower body 100 , while the high-voltage ends are connected to the node hardware 230 . The node hardware 230 connects the post insulator 210 and the diagonal insulator 220 together to form the end of the composite crossarm 200 for hanging conductors.

[0031] The tower body 100 can be a common transmission tower structure, such as a lattice iron tower, a pole body, or a composite pole tower. A composite crossarm 200 can be provided on one side of the tower body 100, or on multiple sides of the tower body 100. A single composite crossarm 200 can be provided on one side of the tower body 100, or multiple composite crossarms 200 can be provided at intervals along the vertical direction.

[0032] Post insulator 210 comprises an insulator, sheds wrapped around the insulator's outer periphery, and end fittings at each end of the insulator. The insulator is a composite insulator made of glass fiber impregnated with epoxy resin, while the sheds can be made of materials such as high-temperature vulcanized silicone rubber, liquid silicone rubber, or room-temperature vulcanized silicone rubber, without limitation. The structure and materials of the oblique-stayed insulator 220 are similar to those of the post insulator 210 and will not be further described.

[0033] In one application scenario, there is one post insulator 210 and one diagonal insulator 220 (as shown in FIG1 ). The low-voltage end of the diagonal insulator 220 is located on the same vertical line as the low-voltage end of the post insulator 210, and the low-voltage end of the diagonal insulator 220 is higher than the low-voltage end of the post insulator 210. In another application scenario, there are two post insulators and two diagonal insulators. In yet another application scenario, there are two post insulators and one diagonal insulator. In summary, this application does not limit the number of post insulators 210 or diagonal insulators 220.

[0034] In conjunction with Figures 1 to 3, the node hardware 230 includes two plywood 231 arranged parallel to each other. The plywood 231 is a plate member. The plywood 231 can be a rectangular plate member, a circular plate member or other special-shaped plate member. In the present application, the plywood 231 is a special-shaped plate member, specifically a polygonal plate member, which is convenient for connection with other components. At the same time, the plate surface size of the plywood 231 is minimized to reduce the weight of the plywood 231, thereby reducing the weight of the node hardware 230 and reducing costs. The present application constitutes the node hardware 230 by two plywood 231 arranged in parallel, and a certain gap is left between the two plywood 231. Compared with the node hardware composed of a single flat plate with the same total thickness, the node hardware 230 of the present application has a larger cross-sectional coefficient around the neutral axis, has a higher bending moment resistance, and can extend the service life of the node hardware 230.

[0035] The post insulator 210 and the diagonal insulator 220 are both inserted between two clamping plates 231 via a connecting hardware, thereby connecting the post insulator 210 and the diagonal insulator 220 to the node hardware 230. Referring to FIG4 , the high-voltage end of the post insulator 210 is provided with a first connecting hardware 211. The first connecting hardware 211 includes a first flange tube 2111, a first sealing plate 2112, and a first plug plate 2113. The first flange tube 2111 is axially configured as a hollow structure and is sleeved on one end of the insulator of the post insulator 210. The first sealing plate 2112 covers the end of the first flange tube 2111 away from the post insulator 210 to prevent moisture and the like from entering the insulator. The first plug plate 2113 is disposed on the side of the first sealing plate 2112 away from the first flange tube 2111, and the first plug plate 2113 is disposed perpendicular to the first sealing plate 2112. A plurality of first connection holes 21131 are provided on the first plug plate 2113, and a plurality of second connection holes 232 are provided on the two clamping plates 231. The number and position of the first connection holes 2113 correspond one-to-one with the second connection holes 232. When the first plug plate 2113 is inserted between the two clamping plates 231, the first connection holes 21131 correspond to the second connection holes 232 and fasteners are inserted therethrough to fix the first connecting hardware 211 with the node hardware 230. Thus, the post insulator 210 can be fixedly connected to the node hardware 230.

[0036] In other embodiments, when the number of post insulators is at least two, the multiple post insulators can be first connected to the first connecting hardware of other structures, and then fixedly connected to the node hardware through the first connecting hardware. The details are not repeated here.

[0037] The high-voltage end of the oblique-stayed insulator 220 is provided with a second connecting hardware 221. The second connecting hardware 221 is a plate. A third connecting hole 2211 is provided on the second connecting hardware 221. A fourth connecting hole 233 is provided on the two clamping plates 231. The second connecting hardware 221 is inserted between the two clamping plates 231. After the third connecting hole 2211 corresponds to the fourth connecting hole 233, a fastener is passed through to fix the second connecting hardware 221 with the node hardware 230, so that the oblique-stayed insulator 220 can be fixedly connected to the node hardware 230.

[0038] In other embodiments, when the number of the oblique-pull insulators is at least two, a connector may be provided, one end of which is fixedly connected to the node fitting 230 and the other end of which is fixedly connected to a plurality of oblique-pull insulators. Details are omitted here.

[0039] The second connection hole 232 and the fourth connection hole 233 are located at different ends of the clamping plate 231, forming a certain angle between the post insulator 210 and the diagonal insulator 220. This creates a stable triangular structure among the post insulator, diagonal insulator 220, and tower body 100, ensuring the structural stability of the composite crossarm 200. This also ensures that the node hardware 230 is evenly stressed, avoiding concentrated stress at a single location and extending the service life of the node hardware 230.

[0040] In conjunction with Figures 2 and 3, a hanging hole 234 is provided at the bottom of the splint 231. A hanging hardware string 310 is directly mounted in the hanging hole 234. Two wire clamps 311 are correspondingly provided on the hanging hardware string 310 for hanging two sub-conductors. A first construction hole 235 is also provided at the bottom of the splint 231. The first construction hole 235 is spaced apart from the hanging hole 234 for construction or maintenance. In one embodiment, the transmission tower 10 uses a composite crossarm 200 to suspend a single-phase four-split conductor. In this embodiment, the hanging holes 234 at the bottom of the splint 231 are spaced apart to form two, which is convenient for hanging hardware strings using, for example, a double-hanging-point double-connection method, with two sub-conductors hung in each hanging hole 234. The two hanging holes 234 and one first construction hole 235 are spaced apart in parallel along a direction parallel to the bottom of the splint 231, which can ensure the uniformity of force on the node hardware 230. During use, the first construction hole 235 can be used to mount the wire hanging hardware string 310, while the wire hanging hole 234 can be used for construction or maintenance. In other words, the functions of the wire hanging hole 234 and the first construction hole 235 are interchangeable. In other embodiments, the number of wire hanging holes and the number of first construction holes can also be set to meet the wire hanging requirements.

[0041] The node hardware 230 of the present application has a simple structure, is easy to process, has a clear force transmission path, and has a simple force form.

[0042] Referring to Figures 1 and 4, in one embodiment, two first connecting plates 2114 are provided on the first connecting hardware 211, and the two first connecting plates 2114 are distributed on both sides of the first flange tube 2111 along the extension direction of the conductor. Temporary wire pulling holes 21141 are provided on the first connecting plates 2114, and wire pulling wires can be arranged during the installation and wiring process of the composite crossarm 200. In this embodiment, two wire pulling wires can be set on both sides of the support insulator 210, one end of each wire pulling wire is connected to the first connecting hardware 211 through the temporary wire pulling hole 21141, and the other end is connected to the tower body 100, so as to ensure the stability of the composite crossarm 200 during the construction and installation process.

[0043] In one application scenario, the first connecting fitting 211 is further provided with a second connecting plate 2115 and a third connecting plate 2116. The second connecting plate 2115 and the third connecting plate 2116 are distributed on both sides of the first flange cylinder 2111 perpendicular to the direction of extension of the conductor, i.e., at the top and bottom of the first flange cylinder 2111 in Figure 4. In one application scenario, the two first connecting plates 2114, the second connecting plate 2115, and the third connecting plate 2116 are evenly distributed along the circumference of the first flange cylinder 2111. The second connecting plate 2115 is provided with a mounting hole for installing an arcing device, and the third connecting plate 2116 is provided with a second construction hole for construction or maintenance.

[0044] 5 and 6 , in another embodiment, two opposite outer surfaces of the two clamping plates 231 of the node fitting 230 are respectively connected to fixing plates 236 , which are provided with third construction holes for construction or maintenance of the composite crossarm 200 .

[0045] In one application scenario, an auxiliary connector 237 is installed on the fixing plate 236. The fixing plate 236 and the auxiliary connector 237 are connected by providing corresponding through holes in the fixing plate 236 and the auxiliary connector 237 and inserting fasteners into the through holes. A third construction hole is provided on the auxiliary connector 237 to securely connect other auxiliary devices used in the construction or maintenance of the composite crossarm 200 to the node hardware 230. The provision of the auxiliary connector 237 can prevent interference between other auxiliary devices and the composite crossarm 200 when directly installed on the fixing plate 236, thereby facilitating installation.

[0046] In this embodiment, the auxiliary connecting member 237 is a T-shaped plate, and the auxiliary connecting member 237 and the fixing plate 236 are detachably connected by bolts and nuts, so that the auxiliary connecting member 237 can be removed and reused; in other embodiments, other auxiliary devices can also be directly connected by setting a third construction hole on the fixing plate or other parts of the node hardware, which is not limited here.

[0047] Continuing with Figure 6, reinforcing ribs 238 are provided between the outer surface of the clamping plate 231 and the two opposite surfaces of the fixing plate 236. Specifically, the two reinforcing ribs 238 are provided between the two sides of the fixed connection between the clamping plate 231 and the fixing plate 236. The provision of the reinforcing ribs 238 further increases the connection strength between the fixing plate 236 and the clamping plate 231, thereby preventing other auxiliary devices from falling off due to breakage of the fixing plate 236 when fixed to the node hardware 230, further eliminating safety hazards.

[0048] The clamping plate 231 , the fixing plate 236 and the reinforcing rib 238 can be formed separately and then connected by welding, or can be directly formed as one piece, which is not limited here.

[0049] Continuing to refer to Figure 6, in this embodiment, the high-voltage end sleeve of the post insulator 210 is provided with an end fitting 212, and the end fitting 212 is detachably connected to the third connecting fitting 213, which facilitates the disassembly and replacement of the post insulator 210 and realizes the operation and maintenance of the composite crossarm 200. The end fitting 212 includes a second flange tube and a second sealing plate. The second flange tube is axially arranged as a hollow structure and is sleeved on one end of the insulator of the post insulator 210. The second sealing plate covers the end of the second flange tube away from the post insulator 210 to prevent moisture and the like from entering the insulator. The third connecting fitting 213 includes a third sealing plate and a second plug-in plate. The second plug-in plate is arranged perpendicular to the third sealing plate. By matching the second sealing plate and the third sealing plate and then inserting fasteners, the end fitting 212 and the third connecting fitting 213 are detachably fixedly connected. At the same time, the second plug plate is inserted and fixed between the two clamping plates 231 so that the third connecting hardware 213 is fixedly connected to the node hardware 230 , thereby fixing the post insulator 210 to the node hardware 230 .

[0050] Continuing to refer to Figures 1 and 2, an arc striking device is installed on the composite crossarm 200, specifically including a high-voltage end arc striking assembly and a low-voltage end arc striking assembly. The high-voltage end arc striking assembly is arranged at the high-voltage end of the composite crossarm, and the low-voltage end arc striking assembly is arranged at the low-voltage end of the composite crossarm. The high-voltage end arc striking assembly and the low-voltage end arc striking assembly form the shortest electrical gap on the composite crossarm 200. Therefore, in the event of overvoltage, such as when struck by lightning, the discharge gap between the high-voltage end arc striking assembly and the low-voltage end arc striking assembly is first broken down, which can prevent large current from flowing from the high-voltage end of any insulator on the composite crossarm 200 to the low-voltage end and burning the insulator, thereby protecting the composite crossarm 200 and reducing safety hazards.

[0051] The high-voltage end of the post insulator 210 is equipped with a first high-voltage end arcing assembly 410. This assembly includes a first arcing ball 411 and a first arcing rod 412. One end of the first arcing rod 412 is connected to the high-voltage end of the post insulator 210, and the other end is connected to the first arcing ball 411. The first arcing ball 411 serves as the arcing end of the first high-voltage end arcing assembly 410. Given the high electric field intensity at the high-voltage end of the post insulator 210, the first arcing ball 411 serves as the arcing end of the first high-voltage end arcing assembly 410. While ensuring arcing, the spherical structure also reduces tip discharge and ensures uniform electric field distribution. The end of the first arcing rod 412 not connected to the first arcing ball 411 is fixedly connected to the second connecting plate 2115, securing the first high-voltage end arcing assembly 410 to the post insulator 210.

[0052] The low-voltage end of the post insulator 210 is equipped with a first low-voltage end arcing assembly 420. This assembly includes a first arcing ring 421 and a second arcing rod 422. The first arcing ring 421 has a first notch. One end of the second arcing rod 422 connects to the first arcing ring 421 at the first notch, while the other end is bent away from the first arcing ring 421. The end of the second arcing rod 422 facing away from the first arcing ring 421 serves as the arcing end of the first low-voltage end arcing assembly 420. Given the low electric field strength at the low-voltage end of the post insulator 210 and to reduce equipment costs, the arcing end of the first low-voltage end arcing assembly 420 only needs to serve as the arcing end. Therefore, the free end of the second arcing rod 422, not connected to the post insulator 210, serves as the arcing end of the first low-voltage end arcing assembly 420. The first low-voltage end arcing assembly 420 is fixedly connected to the low-voltage end of the post insulator 210 via a connector (not shown).

[0053] The high-voltage end of the diagonal-stayed insulator 220 is equipped with a second high-voltage-end arcing assembly 430. This assembly includes a second arcing ring 431, a second arcing ball 432, and a connecting bracket 433. The second arcing ring 431 is connected to the second connecting fitting 221 via the connecting bracket 433, thereby connecting the second high-voltage-end arcing assembly 430 to the high-voltage end of the diagonal-stayed insulator 220. Simultaneously, the second arcing ball 432 is also connected to the diagonal-stayed insulator 220 via the connecting bracket 433. The second arcing ring 431 has a second notch, and the second arcing ball 432 is located in the second notch, serving as the arcing end of the second high-voltage-end arcing assembly 430. Given the high electric field intensity at the high-voltage end of the diagonal-stayed insulator 220, the second arcing ball 432 serves as the arcing end of the second high-voltage-end arcing assembly 430. While providing an arcing function, the spherical structure also reduces tip discharge and ensures uniform electric field distribution.

[0054] The low-voltage end of the oblique-stayed insulator 220 is provided with a second low-voltage end arcing assembly 440 . The structure of the second low-voltage end arcing assembly 440 is similar to that of the first low-voltage end arcing assembly 420 and will not be described in detail.

[0055] 2 , in order to further improve safety performance and ensure the service life of the composite cross-arm 200 , a voltage grading ring 240 is further provided on the high-voltage end of the post insulator 210 .

[0056] Continuing with Figure 1 , the transmission tower 10 further includes a first hinge 510 and a second hinge 520 , both of which are rotatable connectors. The first hinge 510 connects the low-voltage end of the post insulator 210 to the tower body 100 , allowing the post insulator 210 to rotate relative to the tower body 100 . The second hinge 520 connects the low-voltage end of the cable-stayed insulator 220 to the tower body 100 , allowing the cable-stayed insulator 220 to rotate relative to the tower body 100 .

[0057] In this application, there is only one post insulator 210 and one diagonal insulator 220, which together with the tower body 100 form a stable triangular structure. During actual operation, the composite crossarm 200 is affected by factors such as wind load, which can cause unbalanced tension in the conductors. At this point, the composite crossarm 200 rotates toward the side with greater conductor tension, causing parameters such as the span (the horizontal distance between the conductor suspension points of two adjacent transmission towers) of the conductors on both sides to change. This means that the conductor hanging end on the composite crossarm 200 shifts until it reaches a certain position, at which point the tension on both sides reaches a new equilibrium, thereby releasing the unbalanced tension and improving the safety of the transmission line.

[0058] Since this design has a certain effect of releasing unbalanced tension loads, it is possible to consider lowering the design specifications during the design. Compared with the fixed connection method, this application can adopt a smaller disconnection load design, which can reduce the production cost.

[0059] At the same time, in the existing technology, the support insulator 210 is usually connected to the tower body 100 in the form of a strap (including a plug-in plate, etc.). This connection method is actually between fixed connection and hinged connection. However, when performing the corresponding compressive stability calculation, for safety reasons, it is often assumed to be a hinged boundary condition, resulting in design redundancy. However, in the design of this application, the connection method between the support insulator 210 and the inclined insulator 220 and the tower body 100 is hinged, which is consistent with the boundary condition assumption in the stability calculation formula, and can avoid design redundancy.

[0060] In other embodiments, the composite cross-arm and the tower body may also be connected via a fixed connector, in which case the post insulators and the diagonal insulators cannot rotate relative to the tower body.

[0061] Continuing with Figure 1 , the tower 100 includes a tower body 110, a first support frame 120, and a second support frame 130. The first support frame 120 and the second support frame 130 are protruding from the same sidewall of the tower body 110. The first support frame 120 is connected to the low-voltage end of the post insulator 210, and the second support frame 130 is connected to the low-voltage end of the diagonal insulator 220.

[0062] The first support frame 120 can be adaptively designed according to the relative position and angle between the post insulator 210 and the tower body 100 , and the second support frame 130 can be adaptively designed according to the relative position and angle between the inclined insulator 220 and the tower body 100 .

[0063] The arrangement of the first support frame 120 and the second support frame 130, on the one hand, allows for convenient and efficient maintenance of the composite crossarm 200 and the tower body 100; on the other hand, when a plurality of composite crossarms 200 are arranged on the tower body 100, the sizes of the plurality of composite crossarms 200 can be made consistent because the spacing between the composite crossarm 200 and the tower body 100 can be adjusted by the first support frame 120 and the second support frame 130, thereby improving production efficiency.

[0064] In some other embodiments, the first and second support frames may not be installed, and the post insulators and diagonal insulators may be directly installed on the tower body. Alternatively, only the first support frame may be installed without the second support frame. In this case, the post insulators are connected to the first support frame, and the diagonal insulators are directly installed on the tower body. This is not a limitation.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A transmission tower, characterized in that: The transmission tower comprises a tower body and a composite cross arm arranged on the tower body, the composite cross arm comprises a post insulator, a diagonal insulator and a node hardware, the low-voltage ends of the post insulator and the diagonal insulator are connected to the tower body, and the high-voltage ends are connected together through the node hardware, the node hardware comprises two clamping plates arranged parallel to each other, the post insulator and the diagonal insulator are inserted between the two clamping plates through the connecting hardware, so that the post insulator and the diagonal insulator are connected to the node hardware, and the clamping plate is provided with a wire hanging hole for hanging the wire.

2. The transmission tower according to claim 1, characterized in that: The high voltage end of the post insulator is provided with a first connection fitting, and the first connection fitting comprises: The flange cylinder is configured as a hollow structure along the axial direction; A sealing plate, covering the end of the flange tube away from the post insulator; The plug plate is arranged on the side of the sealing plate away from the flange cylinder, and the plug plate is perpendicular to the sealing plate.

3. The transmission tower according to claim 2, characterized in that: The plug plate is provided with a first connection hole, and the two clamping plates are provided with second connection holes. The plug plate is inserted between the two clamping plates. A fastener is inserted after the first connection hole corresponds to the second connection hole, so that the first connection fitting is fixedly connected to the node fitting.

4. The transmission tower according to claim 1, characterized in that: The high-voltage end of the inclined insulator is provided with a second connecting hardware, which is a plate. The second connecting hardware is provided with a third connecting hole, and a fourth connecting hole is provided on the two clamping plates. The second connecting hardware is inserted between the two clamping plates, and a fastener is passed through after the third connecting hole corresponds to the fourth connecting hole, so that the second connecting hardware is fixedly connected to the node hardware.

5. The transmission tower according to claim 1, characterized in that: The high-voltage end of the composite cross arm is provided with a high-voltage end arcing assembly, and the low-voltage end of the composite cross arm is provided with a low-voltage end arcing assembly. The high-voltage end arcing assembly and the low-voltage end arcing assembly form the shortest electrical gap on the composite cross arm.

6. The transmission tower according to claim 5, characterized in that: The high-voltage end arcing assembly includes a first arcing ball and a first arcing rod. One end of the first arcing rod is connected to the high-voltage end of the composite crossarm, and the other end is connected to the first arcing ball. The first arcing ball serves as the arcing end of the high-voltage end arcing assembly.

7. The transmission tower according to claim 5, characterized in that: The low-voltage end arcing assembly includes a first arcing ring and a second arcing rod. The first arcing ring is provided with a first notch. One end of the second arcing rod is connected to the first arcing ring at the first notch, and the other end is bent in a direction away from the first arcing ring. The end of the second arcing rod away from the first arcing ring serves as the arcing end of the low-voltage end arcing assembly.

8. The transmission tower according to claim 5, characterized in that: The high-voltage end arcing assembly includes a second arcing ring, a second arcing ball and a connecting bracket. The second arcing ring and the second arcing ball are connected to the composite crossarm through the connecting bracket. The second arcing ring is provided with a second notch. The second arcing ball is located at the second notch and serves as the arcing end of the high-voltage end arcing assembly.

9. The transmission tower according to claim 1, characterized in that: The transmission tower further comprises: A first hinged member, connecting the low voltage end of the post insulator and the tower body, so that the post insulator can rotate relative to the tower body; The second hinged member connects the low-voltage end of the oblique-stayed insulator and the tower body, so that the oblique-stayed insulator can rotate relative to the tower body.

10. The transmission tower according to claim 1, characterized in that: The tower body comprises: The tower body; The first support frame and the second support frame are protrudingly arranged on the same side wall of the tower body, the first support frame is connected to the low-voltage end of the post insulator, and the second support frame is connected to the low-voltage end of the oblique-pull insulator.

11. The transmission tower according to claim 1, characterized in that: Two outer plate surfaces facing away from each other of the two clamping plates are respectively connected with fixing plates, and construction holes are arranged on the fixing plates for the construction and maintenance of the composite cross arm.

12. The transmission tower according to claim 1, characterized in that: Two outer plate surfaces facing away from each other of the two clamping plates are respectively connected with fixing plates, and auxiliary connecting pieces are arranged on the fixing plates. The auxiliary connecting pieces are provided with construction holes for the construction and maintenance of the composite cross arm.

13. The transmission tower according to claim 12, characterized in that: The auxiliary connecting piece is a T-shaped plate, and the auxiliary connecting piece is detachably connected to the fixing plate.

14. The transmission tower according to claim 13, characterized in that: Reinforcing ribs are arranged between the outer plate surface of the clamping plate and the two plate surfaces opposite to the fixing plate.

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