CN112282480A

CN112282480A - Power transmission tower

Info

Publication number: CN112282480A
Application number: CN202011359128.9A
Authority: CN
Inventors: 曹明阳; 王鑫龙; 李先志; 李琼
Original assignee: Shanghai Shenma Electric Power Engineering Co ltd
Current assignee: Shanghai Shenma Electric Power Engineering Co ltd
Priority date: 2020-11-27
Filing date: 2020-11-27
Publication date: 2021-01-29

Abstract

The application discloses transmission tower, this transmission tower includes: a tower body; compounding cross arms; the connecting and rotating assembly is used for connecting the tower body and the composite cross arm and enabling the composite cross arm to rotate around a rotating axis relative to the tower body; the limiting assembly is used for limiting the maximum rotation angle of the composite cross arm relative to the tower body. The power transmission tower provided by the application can reduce the possibility of abnormal discharge and the probability of impact between the composite cross arm and the tower body under the normal operation working condition.

Description

Power transmission tower

Technical Field

The application relates to the technical field of power transmission, in particular to a power transmission tower.

Background

The transmission line is an important life line for national economic development, once the transmission line in a certain area fails, immeasurable economic loss can be caused to users in the area served by the transmission line, so that the normal operation of the transmission line is very important for daily life and economic development, and the transmission tower is a necessary condition for ensuring the normal operation of the transmission line.

Most of the existing power transmission towers comprise a tower body and a cross arm used for hanging a power transmission line, wherein the cross arm is arranged on the tower body and extends outwards for a certain length distance. The inventor of the application finds that at present, under extreme weather such as typhoon, the tower body is stressed too much and is damaged and the cross arm protruding out of the tower body has potential safety hazards such as breakage and small safety electric clearance with the tower body.

Disclosure of Invention

The utility model provides a power transmission tower can reduce the too big impaired and probability that compound cross arm and body of the tower collided under abnormal operating condition of body of the tower atress.

In order to solve the technical problem, the application adopts a technical scheme that: there is provided a transmission tower, comprising: a tower body; compounding cross arms; the connecting and rotating assembly is used for connecting the tower body and the composite cross arm and enabling the composite cross arm to rotate around a rotating axis relative to the tower body; and the limiting assembly is used for limiting the maximum angle of the composite cross arm relative to the tower body in rotation.

The number of the limiting assemblies is two, and the two limiting assemblies are arranged on two sides of the composite cross arm respectively along the direction of the composite cross arm relative to the tower body in a rotating mode and are connected with the tower body respectively.

Wherein, spacing subassembly includes: one end of the first limiting piece is connected with the composite cross arm; and one end of the second limiting part is connected with the tower body, the other end of the second limiting part is movably connected with the other end of the first limiting part, which is far away from the composite cross arm, and the relative movement distance between the second limiting part and the first limiting part is limited within a preset distance range.

Wherein, spacing subassembly still includes: and the connecting piece is connected with the other end of the second limiting piece, which is far away from the tower body, and the other end of the first limiting piece, which is far away from the composite cross arm, so that the other end of the second limiting piece, which is far away from the tower body, can move relative to the other end of the first limiting piece, which is far away from the composite cross arm.

When the external acting force applied to the composite cross arm is larger than a set threshold value, the connecting piece is automatically disconnected to separate the first limiting piece from the second limiting piece, and the limiting assembly fails.

The composite cross arm comprises at least one composite cable-stayed insulator and at least one composite post insulator; the connecting and rotating assembly comprises a first sub connecting and rotating assembly and a second sub connecting and rotating assembly; one end of at least one composite post insulator is connected to the tower body through the first sub-connecting rotating assembly, and one end of at least one composite cable-stayed insulator is connected to the tower body through the second sub-connecting rotating assembly; and the other end of at least one composite cable-stayed insulator is connected with the other end of at least one composite post insulator.

The number of the limiting assemblies is two, and the two limiting assemblies are arranged along the positions, opposite to the composite post insulator, of the tower body in the rotating direction respectively.

Wherein the composite post insulator rotates about a first axis relative to the first sub-connecting rotating assembly; the composite cable-stayed insulator rotates around a second axis relative to the second sub-connecting rotating assembly, the first axis, the second axis and the rotating axis are overlapped, and an included angle between the rotating axis and the central line of the tower body is an acute angle.

Wherein, the composite post insulator passes through first sub-rotation coupling assembling with spacing subassembly is connected.

When the composite cross arm rotates relative to the tower body, the end part of the composite cross arm far away from the tower body ascends towards the direction far away from the ground.

The beneficial effect of this application is: this application sets up compound cross arm on the one hand and can rotate the body of the tower relatively, can release the tension on the compound cross arm, reduce the possibility that compound cross arm atress warp, on the other hand sets up the central axis that compound cross arm is relative body of the tower pivoted axis of rotation and body of the tower crossing, and contained angle between the two is the acute angle, it is perpendicular or parallel with the central axis to compare axis of rotation among the prior art, can enlarge the motion stroke of compound cross arm and body of the tower contact, thereby guarantee the safe electric clearance between compound cross arm and the body of the tower, reduce the probability of compound cross arm and body of the tower striking under abnormal operation operating mode, the protection power transmission tower, and service life is prolonged.

Considering that the end part of the composite cross arm far away from the tower body is usually used for hanging and arranging a power transmission line, the acting force applied to the composite cross arm faces the ground, when the composite cross arm is arranged to rotate relative to the tower body, the end part of the composite cross arm far away from the tower body rises towards the direction far away from the ground, so that when the composite cross arm is required to rotate relative to the tower body, the rotation of the composite cross arm can be prevented by the acting force applied to the end part of the composite cross arm far away from the tower body, and the rotation amplitude of the composite cross arm under the normal operation working condition is reduced to a.

Meanwhile, the limiting assemblies are arranged on two sides of the composite post insulator respectively along the direction of the composite post insulator rotating relative to the tower body, the rotating amplitude of the composite cross arm under the normal operation working condition is limited, safety accidents such as flashover and the like caused by the undersize electric gap between the composite cross arm and the tower body after the rotating angle of the composite cross arm is too large are avoided, and the phenomenon that the rotating angle of the composite cross arm is too large to collide with an iron tower under the normal operation working condition can also be prevented.

In addition, a first limiting part and a second limiting part in the limiting assembly are rotatably connected through a connecting piece, under a normal working condition, the connecting piece ensures the connection of the first limiting part and the second limiting part, and further ensures the limitation of the limiting assembly on the rotation amplitude of the composite post insulator, and under an abnormal working condition, when the torsional force received by the composite post insulator is gradually increased to be larger than a set threshold value, the connecting piece is automatically disconnected, the first limiting part is separated from the second limiting part, at the moment, the limiting assembly does not play a limiting role any more, the tension on the composite cross arm is released, so that the stress of the tower body is reduced, and the possibility that the tower body topples under the abnormal working condition is reduced. And when the rotation angle of the composite post insulator needs to be limited again, the connecting piece is only required to be installed again to connect the first limiting piece and the second limiting piece, the operation is convenient, and the operation and maintenance efficiency can be improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Wherein:

fig. 1 is a schematic structural diagram of an embodiment of a transmission tower according to the present application;

FIG. 2 is an enlarged schematic view at A in FIG. 1;

FIG. 3 is a schematic diagram of a portion of the structure of FIG. 2;

FIG. 4 is an enlarged schematic view at B of FIG. 1;

fig. 5 is a schematic view of the structure of the connecting bracket of fig. 1.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a transmission tower of the present application, where the transmission tower 1000 includes a tower body 1100, a composite cross arm 1200, and a connection rotation member 1300.

The tower body 1100 may be a lattice tower, a rod body, or a transmission tower structure with a common structure such as a composite material tower, in this embodiment, the tower body 1100 is a lattice tower, and only a part of the structure is shown in the drawing. Meanwhile, the tower 1100 has a symmetrical structure with a central axis 1101.

The composite cross arm 1200 is made of a composite material, has the advantages of high strength, light weight, corrosion resistance, easiness in processing, designability, good insulativity and the like, can improve the distance of a power transmission line to the ground under the condition of not increasing the height of a tower, effectively ensures the safety of the surrounding electrical environment, and can also eliminate the potential safety hazard of power jumping caused by insufficient electrical distance between the power transmission line and the tower body 1100 due to overlarge wind deflection.

The connecting rotation assembly 1300 connects the tower body 1100 and the composite cross arm 1200, and enables the composite cross arm 1200 to rotate relative to the tower body 1100, wherein a rotation axis 1201 of the composite cross arm 1200 rotating relative to the tower body 1100 intersects with a central axis 1101 of the tower body 1100, and an included angle theta between the two is an acute angle.

Specifically, in connection with pivot assembly 1300, when composite cross arm 1200 is subjected to a certain amount of external force, it can pivot about pivot axis 1201 relative to tower 1100, releasing tension and reducing the possibility of deformation of the cross arm due to force.

Meanwhile, the rotation axis 1201 is intersected with the central axis 1101 of the tower body 1100, and the included angle theta between the rotation axis 1201 and the central axis 1101 is an acute angle, so that compared with the prior art that the rotation axis 1201 is perpendicular to or parallel to the central axis 1101, the motion stroke of the composite cross arm 1200 contacting with the tower body 1100 can be enlarged, thereby ensuring the safe electrical clearance between the composite cross arm 1200 and the tower body 1100, reducing the probability of collision between the composite cross arm 1200 and the tower body 1100 under the abnormal operation working condition, protecting the power transmission tower 1000 and prolonging the service life.

In the present embodiment, when composite cross arm 1200 is rotated relative to tower body 1100, end 1202 of composite cross arm 1200 facing away from tower body 1100 rises in a direction away from the ground.

Specifically, considering that the end 1202 of the composite cross arm 1200 away from the tower 1100 is generally used for hanging the power line, and the acting force is directed towards the ground, when the composite cross arm 1200 is subjected to an external acting force and is intended to rotate relative to the tower 1100, the acting force applied to the end 1202 can prevent the composite cross arm 1200 from rotating under the normal operation condition, so that the rotation amplitude of the composite cross arm 1200 under the normal operation condition can be reduced to a certain extent.

In other embodiments, when composite cross arm 1200 rotates relative to tower body 1100, end 1202 of composite cross arm 1200 distal from tower body 1100 may also be lowered relative to the ground, without limitation.

With continued reference to fig. 1-4, in the present embodiment, the connecting rotating assembly 1300 includes a first sub-connecting rotating assembly 1310 and a second sub-connecting rotating assembly 1320, and the composite cross arm 1200 includes a composite post insulator 1210 and a composite cable-stayed insulator 1220.

One end of the composite post insulator 1210 is rotatably connected to the tower body 1100 through the first sub-connecting rotating assembly 1310 and can rotate around a first axis 1211 relative to the tower body 1100, and one end of the composite diagonal insulator 1220 is rotatably connected to the tower body 1100 through the second sub-connecting rotating assembly 1320 and can rotate around a second axis 1221 relative to the tower body 1100, wherein the other end of the composite post insulator 1210, which is far away from the tower body 1100, is connected to the other end of the composite diagonal insulator 1220, which is far away from the tower body 1100, to form an end portion 1202 of the composite cross arm 1200, which is far away from the tower body 1100, and the first axis 1211 and the second axis 1221 are both coincident with the rotation axis 1201 of the composite cross arm 1200, which rotates relative to the tower body 1100.

Specifically, the composite post insulator 1210 rotates about the first axis 1211 relative to the tower body 1100 and the composite diagonal insulator 1220 rotates about the second axis 1221 relative to the tower body 1100, such that the composite cross arm 1200 rotates about the rotation axis 1201 integrally relative to the tower body 1100.

Simultaneously can also make the outrigger structure that has the contained angle between compound post insulator 1210 and the compound oblique-pulling insulator 1220 through above-mentioned setting, the atress is reasonable, thereby under extreme typhoon weather, compound cross arm 1200 non-deformable or rupture, and can restrain the power transmission line because of the wind pendulum and the body of the tower 1100 be close to the windage yaw flashover accident that arouses, guarantee the safe electric clearance between power transmission line and the body of the tower 1100 under the strong wind operating mode, guarantee the stability ability of user's power consumption.

In other embodiments, composite cross arm 1200 may have other configurations, such as only composite post insulator 1210 or more than one of composite post insulator 1210 and composite diagonal insulator 1220. In summary, the present application does not limit the structure of composite cross arm 1200.

Referring to fig. 1 to 3, in the present embodiment, the first sub-connecting rotation assembly 1310 includes a base 1311 and a connecting rotation member 1312.

The base 1311 is mounted on the tower 1100, and in one application scenario, the base 1311 is mounted on the tower 1100 by welding, and in other application scenarios, the base 1311 may also be mounted on the tower 1100 by other means such as bolting. And the connection between the base 1311 and the tower 1100 may be a fixed connection or a movable connection.

A connecting rotor 1312 is provided on the base 1311 to connect the composite post insulator 1210 and allow the composite post insulator 1210 to rotate about the first axis 1211 with respect to the base 1311, thereby allowing the composite post insulator 1210 to rotate about the first axis 1211 with respect to the tower 1100.

Specifically, connecting rotor 1312 connects base 1311 to composite post insulator 1210 such that composite post insulator 1210 is able to rotate about first axis 1211 relative to base 1311, and thus composite post insulator 1210 is able to rotate about first axis 1211 relative to tower 1100.

With continued reference to fig. 1 to 3, in the present embodiment, the connecting rotation member 1312 includes a rotation rod 13121 and a first connection plate 13122.

The rotation rod 13121 extends in the direction of the first axis 1211, is rotatably provided on the base 1311, and is capable of rotating around the first axis 1211 with respect to the base 1311, and the rotation rod 13121 is connected to the composite post insulator 1210 so that the composite post insulator 1210 is capable of rotating with respect to the base 1311, thereby enabling the composite post insulator 1210 to rotate with respect to the tower 1100. That is, when the composite post insulator 1210 is coupled to the pivot rod 13121, the composite post insulator 1210 can pivot about the first axis 1211 with respect to the base 1311 and further pivot about the first axis 1211 with respect to the tower 1100.

In an application scenario, as shown in fig. 3, the rotation rod 13121 has a hollow structure, and a connecting member such as a bolt is inserted through the hollow structure to connect the rotation rod 13121 with the base 1311, and the rotation rod 13121 is rotated on the base 1311 around the inserted connecting member.

In other embodiments, the rotation rod 13121 itself may also be directly connected to the base 1311 as a rotation shaft, so that the composite post insulator 1210 rotates around the first axis 1211 relative to the base 1311, which is not limited herein.

The first connecting plates 13122 are connected to the rotating rods 13121, the number of the first connecting plates 13122 is two, and the two first connecting plates 13122 are arranged in the circumferential direction of the rotating rods 13121 in an opposite manner and are used for clamping a connecting fitting at the end of the composite post insulator 1210, so that the rotating rods 13121 are connected to the composite post insulator 1210.

Specifically, the two first connecting plates 13122 are arranged to sandwich the connecting hardware on the end of the composite post insulator 1210, so that the rotating rod 13121 is connected with the composite post insulator 1210, and the connection strength between the rotating rod 13121 and the composite post insulator 1210 can be ensured. The two first connection plates 13122 and the connection fittings at the ends of the composite post insulator 1210 may be connected together by welding, or the two first connection plates 13122 and the connection fittings at the ends of the composite post insulator 1210 may be connected together by using locking members such as bolts.

For convenience of description, the connection fitting at the end of the composite post insulator 1210 is defined as a first fitting. In the present embodiment, as shown in fig. 2, the first metal tool 1212 is a flat-leg metal tool.

In other embodiments, the connecting rotation member 1312 may not include the first connecting plate 13122, and the first fitting 1212 may be directly connected to the rotation rod 13121, for example, the first fitting 1212 may be directly connected to the rotation rod 13121 by welding.

Although the composite post insulator 1210 is described as being fixedly connected to the rotation rod 13121, the present invention is not limited thereto, and in other embodiments, the composite post insulator 1210 may be movably connected to the rotation rod 13121, as long as the composite post insulator 1210 can rotate around the first axis 1211 with respect to the tower 1100 by the rotation rod 13121.

Meanwhile, in other embodiments, the number of the first connecting plates 13122 may be one, three or more, and in summary, the application does not limit the specific configuration of the connecting rotation member 1312.

Referring to fig. 1, 4 and 5, in the present embodiment, the second sub-connecting rotating assembly 1320 includes a connecting bracket 1321 and a second connecting plate 1322.

The connecting bracket 1321 is installed on the tower body 1100, in an application scenario, the connecting bracket 1321 is installed on the tower body 1100 by welding, and in other application scenarios, the connecting bracket 1321 may also be installed on the tower body 1100 by other manners such as bolting. And the connection between the connection bracket 1321 and the tower 1100 may be a fixed connection or a movable connection.

One end of the second connecting plate 1322 is connected to the connecting bracket 1321, and the other end is rotatably connected to the composite cable-stayed insulator 1220 through a connecting shaft (not shown) extending along the second axis 1221, so that the cable-stayed composite insulator can rotate relative to the connecting bracket 1321, and further the composite cable-stayed insulator 1220 can rotate relative to the tower body 1100. That is, after the composite cable-stayed insulator 1220 is connected to the second connecting plate 1322, the composite cable-stayed insulator 1220 can rotate about the second axis 1221 with respect to the second connecting plate 1322, and further rotate about the second axis 1221 with respect to the tower 1100.

In this embodiment, the second connecting plate 1322 is fixedly connected to the connecting bracket 1321. In other embodiments, the second connecting plate 1322 may also be movably connected to the connecting bracket 1321.

The connecting shaft (not shown) penetrates through the second connecting plate 1322 and the connecting hardware fitting at the end of the composite cable-stayed insulator 1220 to rotatably connect the second connecting plate 1322 and the composite cable-stayed insulator 1220. In an application scene, the connecting shaft is a bolt.

For convenience of description, the connection hardware at the end of the composite cable-stayed insulator 1220 is defined as the second hardware. In the present embodiment, as shown in fig. 4, the second fitting 1222 is a U-shaped fitting, and the second connecting plate 1322 is sandwiched between the U-shaped fittings.

Specifically, the connecting bracket 1321 is configured to shorten the length of the composite cable-stayed insulator 1220 and improve the economical efficiency while ensuring a safe electrical gap, and to enlarge the angle between the composite cable-stayed insulator 1220 and the composite post insulator 1210 and improve the tensile strength of the composite cable-stayed insulator 1220, thereby preventing a voltage-sharing device (not shown) on the composite cable-stayed insulator 1220 from colliding with a voltage-sharing device (not shown) on the composite post insulator 1210.

Referring to fig. 4 and 5, in the present embodiment, the connection bracket 1321 includes at least two connection bars 13211.

One ends of the at least two connecting rods 13211 are simultaneously connected to the second connecting plate 1322, and the other ends of the at least two connecting rods 13211 are radially spread around the second connecting plate 1322 and simultaneously connected to the tower 1100.

The number of the connecting rods 13211 may be two, three, four (as shown in fig. 4 and 5), or more, which is not limited herein.

Specifically, the tension borne by the composite cable-stayed insulator 1220 is dispersedly transmitted to the tower body 1100 by the arrangement, so that the phenomenon that the connection between the composite cable-stayed insulator 1220 and the tower body 1100 is disconnected due to the concentrated tension transmission can be avoided, and the connection firmness between the composite cable-stayed insulator 1220 and the tower body 1100 is ensured.

In an application scenario, in order to ensure that the tower 1100 is uniformly stressed, the connecting support 1321 has a symmetrical structure, and at least two connecting rods 13211 are symmetrically arranged relative to a plane.

With continued reference to fig. 4 and 5, in this embodiment, the attachment bracket 1321 further includes a mounting plate 13212.

A mounting plate 13212 connects the second connecting plate 1322 and at least two connecting rods 13211.

Specifically, the installation plate 13212 can further increase the length of the connecting bracket 1321, and further shorten the length of the composite cable-stayed insulator 1220 under the condition of ensuring a safe electrical gap, thereby improving the economical efficiency.

In one application scenario, as shown in fig. 4 and 5, the second connecting plate 1322 is connected to one end of the mounting plate 13212, and the ends of at least two connecting rods 13211 are abutted against the plate surface of the mounting plate 13212.

In an application scenario, the connection between the mounting plate 13212 and the at least two connecting rods 13211 and the connection between the mounting plate 13212 and the second connecting plate 1322 are both fixed connections, but the present application is not limited thereto, and in other application scenarios, the connection between the mounting plate 13212 and the at least two connecting rods 13211 and the connection between the mounting plate 13212 and the second connecting plate 1322 may also be movable connections.

In other embodiments, the connecting bracket 1321 may not include the mounting plate 13212, and at least two connecting rods 13211 may be provided to directly connect with the second connecting plate 1322.

Referring to fig. 1, 2 and 3, in the present embodiment, the transmission tower 1000 further includes a spacing assembly 1400.

The number of the limiting assemblies 1400 is two, and the two limiting assemblies 1400 are respectively disposed on two sides of the composite post insulator 1210 along the rotation direction of the composite post insulator 1210 relative to the tower body 1100 and respectively connected to the tower body 1100, so as to limit the maximum rotation angle of the composite post insulator 1210 relative to the tower body 1100.

Specifically, the arrangement of the limiting component 1400 ensures the rotation amplitude of the composite cross arm 1200 under the normal operation condition, and avoids safety accidents such as flashover caused by too small electrical gap between the composite cross arm 1200 and the tower body 1100 after the rotation angle of the composite cross arm 1200 is too large.

In an application scenario, two position limiting assemblies 1400 are symmetrically disposed on both sides of the composite post insulator 1210.

Referring to fig. 2 and 3, in the present embodiment, the position limiting assembly 1400 includes a first position limiting member 1410 and a second position limiting member 1420.

One end of the first limiting piece 1410 is connected with the composite post insulator 1210; one end of the second limiting member 1420 is connected to the tower 1100, and the other end is movably connected to one end of the first limiting member 1410 away from the composite post insulator 1210, and the relative movement distance between the two is limited within a predetermined distance range.

Specifically, the movable distance of the end of the first limiting member 1410 away from the composite post insulator 1210 relative to the end of the second limiting member 1420 away from the tower 1100 is limited within a predetermined distance range, so that the relative movement distance of the first limiting member 1410 relative to the second limiting member 1420 is limited within the predetermined distance range, and since the end of the first limiting member 1410 is connected to the composite post insulator 1210 and the end of the second limiting member 1420 is connected to the tower 1100, the rotation angle of the composite post insulator 1210 relative to the tower 1100 is limited within a predetermined angle range, so that the limiting assembly 1400 performs the limiting function.

In this embodiment, one end of the first limiting member 1410 is fixedly connected to the composite post insulator 1210, and one end of the second limiting member 1420 is fixedly connected to the tower 1100, but the present application is not limited thereto, and in other embodiments, one end of the first limiting member 1410 may be movably connected to the composite post insulator 1210, and one end of the second limiting member 1420 may be movably connected to the tower 1100, as long as it is ensured that the rotation angle of the composite post insulator 1210 relative to the tower 1100 is limited within the angular range by the limiting member 1400.

In an application scenario, the first limiting element 1410 is directly connected to the first hardware 1212 on the composite post insulator 1210.

In another application scenario, the first limiting member 1410 is connected to the connecting rotation member 1312 to realize the connection between the first limiting member 1410 and the composite post insulator 1210. Specifically, referring to fig. 2 to 3, at this time, the connecting rotation member 1312 further includes a third connection plate 13123, the third connection plate 13123 is connected to the periphery of the rotation rod 13121, and the first limiting member 1410 and the third connection plate 13123 are connected to connect with the connecting rotation member 1312, and further connect with the composite post insulator 1210.

In this application scenario, in order to ensure the connection strength, the number of the first limiting members 1410 is two, the third connecting plate 13123 is sandwiched between one ends of the two first limiting members 1410, and the second limiting member 1420 is sandwiched between the other ends of the two first limiting members 1410. Of course, in other application scenarios, the number of the first limiting elements 1410 may also be one.

With continued reference to fig. 2 and 3, in this embodiment, the spacing assembly 1400 further includes a connecting member 1430. The connecting piece 1430 connects the other end of the second limiting piece 1420 far from the tower 1100 with the other end of the first limiting piece 1410 far from the composite post insulator 1210, so that the other end of the second limiting piece 1420 far from the tower 1100 can move relative to the other end of the first limiting piece 1410 far from the composite post insulator 1210; when the external force applied to the composite cross arm 1200 is greater than the predetermined threshold, the connecting member 1430 is automatically disconnected to separate the first limiting member 1410 from the second limiting member 1420, and the limiting assembly 1400 fails.

Specifically, under normal working conditions, the connecting member 1430 ensures the connection between the first limiting member 1410 and the second limiting member 1420, and at this time, the composite cross arm 1200 can rotate within a limited angle range, so as to avoid abnormal discharge caused by too close distance between the composite cross arm 1200 and the tower body within a normal stress range; when abnormal working conditions such as typhoon occur, the torsion force applied to the composite cross arm 1200 is gradually increased, when the torsion force is gradually increased to be larger than a set threshold value, the connecting piece 1430 is automatically disconnected, the first limiting piece 1410 is separated from the second limiting piece 1420, the limiting component 1400 does not limit the rotation angle of the composite cross arm 1200 any more, and the tension on the composite cross arm 1200 can be released, so that the force applied to the tower body 1100 is reduced, and the possibility that the tower body 1100 topples under the abnormal working conditions is reduced.

When the limiting assembly 1400 is needed to limit the rotation angle of the composite post insulator 1210 again, the connecting piece 1430 only needs to be installed again, the operation is convenient, and the operation and maintenance efficiency can be improved.

In one application scenario, the connectors 1430 are shear bolts.

In an application scenario, as shown in fig. 2 and fig. 3, the connecting member 1430 is fixedly connected to the second limiting member 1420 and movably connected to the first limiting member 1410, so that the first limiting member 1410 is movably connected to the second limiting member 1420, and at this time, the first limiting member 1410 is provided with a through hole 1411, the through hole 1411 is a waist-shaped hole, and the connecting member 1430 can only slide in the through hole 1411, so that the moving distance of the first limiting member 1410 relative to the second limiting member 1420 is limited within a predetermined distance range.

In another application scenario, the second position-limiting member 1420 may have a through hole 1411, and the connecting member 1430 is fixedly connected to the first position-limiting member 1410 and movably connected to the second position-limiting member 1420.

Meanwhile, in other embodiments, the position-limiting assembly 1400 may not include the connecting member 1430, and the first position-limiting member 1410 and the second position-limiting member 1420 are directly connected in a rotating manner, for example, one of the first position-limiting member 1410 and the second position-limiting member 1420 is provided with a convex pillar, and the other one of the first position-limiting member 1410 and the second position-limiting member 1420 is provided with a concave groove, and the convex pillar is slidably disposed in the concave groove, so that the first position-limiting member 1410 and the second position-limiting member 1420 are movably connected, and the relative movement distance between the first position-limiting.

In summary, the application is not limited as to how the first limiting element 1410 and the second limiting element 1420 are movably connected.

The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims

1. A transmission tower, comprising:

a tower body;

compounding cross arms;

the connecting and rotating assembly is used for connecting the tower body and the composite cross arm and enabling the composite cross arm to rotate around a rotating axis relative to the tower body;

and the limiting assembly is used for limiting the maximum angle of the composite cross arm relative to the tower body in rotation.

2. The power transmission tower according to claim 1, wherein the number of the limiting assemblies is two, and the two limiting assemblies are respectively arranged on two sides of the composite cross arm along the rotation direction of the composite cross arm relative to the tower body and are respectively connected with the tower body.

3. The transmission tower of claim 1, wherein the spacing assembly comprises: one end of the first limiting piece is connected with the composite cross arm;

and one end of the second limiting part is connected with the tower body, the other end of the second limiting part is movably connected with the other end of the first limiting part, which is far away from the composite cross arm, and the relative movement distance between the second limiting part and the first limiting part is limited within a preset distance range.

4. The transmission tower of claim 3, wherein the spacing assembly further comprises:

and the connecting piece is connected with the other end of the second limiting piece, which is far away from the tower body, and the other end of the first limiting piece, which is far away from the composite cross arm, so that the other end of the second limiting piece, which is far away from the tower body, can move relative to the other end of the first limiting piece, which is far away from the composite cross arm.

5. The transmission tower according to claim 4, wherein the connector automatically opens to separate the first stop member from the second stop member and the stop assembly fails when the external force applied to the composite cross arm is greater than a predetermined threshold.

6. The transmission tower according to claim 1, wherein the composite cross arm comprises at least one composite cable-stayed insulator and at least one composite post insulator;

the connecting and rotating assembly comprises a first sub connecting and rotating assembly and a second sub connecting and rotating assembly;

one end of at least one composite post insulator is connected to the tower body through the first sub-connecting rotating assembly, and one end of at least one composite cable-stayed insulator is connected to the tower body through the second sub-connecting rotating assembly;

and the other end of at least one composite cable-stayed insulator is connected with the other end of at least one composite post insulator.

7. The power transmission tower according to claim 6, wherein the number of the limiting assemblies is two, and the two limiting assemblies are respectively disposed on both sides of the composite post insulator and respectively connected to the tower body in a direction in which the composite post insulator rotates relative to the tower body.

8. The transmission tower according to claim 6, wherein the composite post insulator rotates about a first axis relative to the first sub-coupling rotating assembly; the composite cable-stayed insulator rotates around a second axis relative to the second sub-connecting rotating assembly, the first axis, the second axis and the rotating axis are overlapped, and an included angle between the rotating axis and the central line of the tower body is an acute angle.

9. The transmission tower according to claim 8, wherein the composite post insulator is connected to the spacing member by the first sub-rotational connection assembly.

10. The transmission tower according to claim 1, wherein the end of the composite cross arm facing away from the tower body rises in a direction away from the ground when the composite cross arm is rotated relative to the tower body.