Power transmission tower

Abstract

The application discloses a power transmission tower, which comprises a tower body, a composite cross arm, a connecting rotating assembly for connecting the tower body and the composite cross arm and enabling the composite cross arm to rotate relative to the tower body around a rotating axis, and a limiting assembly for limiting the maximum angle of rotation 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 collision between the composite cross arm and the tower body under normal operation conditions.

Description

TECHNICAL FIELD

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

[0002] Power transmission lines are important lifelines for the development of the national economy. Once the power transmission lines in a certain region fail, it will cause immeasurable economic losses to the users in the region served, so it is extremely important to ensure the normal operation of power transmission lines for daily life and economic development, and the power transmission tower is a necessary condition for ensuring the normal operation of power transmission lines.

[0003] Most of the current power transmission towers include a tower body and a cross arm for hanging power transmission lines, wherein the cross arm is arranged on the tower body and extends outward by a certain length. The present inventor finds that in the current extreme weather such as typhoon, the tower body is damaged by excessive stress, and the cross arm protruding from the tower body is broken and has a small safe electrical gap with the tower body, etc. SUMMARY

[0004] The purpose of the present application is to provide a power transmission tower which can reduce the probability of tower body damage by excessive stress and composite cross arm collision with tower body under abnormal operating conditions.

[0005] To solve the above technical problems, one technical solution adopted by the present application is to provide a power transmission tower, comprising: a tower body; a composite cross arm; a connecting rotating component connecting the tower body and the composite cross arm, and enabling the composite cross arm to rotate relative to the tower body around a rotating axis; and a limiting component for limiting the maximum angle of rotation of the composite cross arm relative to the tower body.

[0006] Among them, the number of limiting components is two, and the two limiting components are respectively arranged on both sides of the composite cross arm along the direction of rotation of the composite cross arm relative to the tower body and are respectively connected with the tower body.

[0007] Among them, the limiting component includes: a first limiting piece connected with one end of the composite cross arm; and a second limiting piece connected with one end of the tower body, and the other end of the second limiting piece is movably connected with the other end of the first limiting piece away from the composite cross arm, and the relative movement distance of the two is limited within a preset distance range.

[0008] Among them, the limiting component further includes: a connecting piece connecting the other end of the second limiting piece away from the tower body with the other end of the first limiting piece away from the composite cross arm, so that the other end of the second limiting piece away from the tower body can move relative to the other end of the first limiting piece away from the composite cross arm.

[0009] When the external force applied to the composite cross arm is greater than a set threshold, the connecting piece is automatically disconnected to separate the first limiting piece from the second limiting piece, and the limiting assembly is disabled.

[0010] The composite cross arm comprises at least one composite cable-stayed insulator and at least one composite strut insulator; the connecting rotating assembly comprises a first sub-connecting rotating assembly and a second sub-connecting rotating assembly; one end of at least one of the composite strut insulators is connected to the tower body through the first sub-connecting rotating assembly, and one end of at least one of the composite cable-stayed insulators is connected to the tower body through the second sub-connecting rotating assembly; the other end of at least one of the composite cable-stayed insulators and the other end of at least one of the composite strut insulators are connected to each other.

[0011] The number of the limiting assemblies is two, and the two limiting assemblies are respectively arranged on the two sides of the composite strut insulator along the direction in which the composite strut insulator rotates relative to the tower body and are respectively connected to the tower body.

[0012] The composite strut insulator rotates relative to the first sub-connecting rotating assembly around a first axis, and the composite cable-stayed insulator rotates relative to the second sub-connecting rotating assembly around a second axis, the first axis and the second axis coincide with the rotating axis, and the included angle between the rotating axis and the center line of the tower body is an acute angle.

[0013] The composite strut insulator is connected to the limiting assembly through the first sub-connecting rotating assembly.

[0014] When the composite cross arm rotates relative to the tower body, the end of the composite cross arm away from the tower body rises in a direction away from the ground.

[0015] The composite cross arm can rotate relative to the tower body, which can release the tension on the composite cross arm, reduce the possibility of stress deformation of the composite cross arm, and the rotating axis of the composite cross arm relative to the tower body intersects with the center axis of the tower body, and the included angle between the two is an acute angle, which can enlarge the movement stroke of the composite cross arm in contact with the tower body, thereby ensuring the safe electrical clearance between the composite cross arm and the tower body, reducing the probability of collision between the composite cross arm and the tower body under abnormal operating conditions, protecting the power transmission tower, and prolonging the service life.

[0016] Considering that the end of the composite cross arm away from the tower body is usually used for hanging the power transmission line, the force acting on the end of the composite cross arm away from the tower body is towards the ground, and thus when the composite cross arm rotates relative to the tower body, the end of the composite cross arm away from the tower body rises in a direction away from the ground, so that when the composite cross arm wants to rotate relative to the tower body, the rotation of the composite cross arm can be prevented by the force acting on the end of the composite cross arm away from the tower body, and the rotation range of the composite cross arm under normal operating conditions is reduced to a certain extent.

[0017] Meanwhile, the limiting assembly is arranged on both sides of the composite post insulator along the direction in which the composite post insulator rotates relative to the tower body, so as to limit the rotation range of the composite cross arm under normal operating conditions, avoid the electrical clearance between the composite cross arm and the tower body being too small after the rotation angle of the composite cross arm is too large, and thus prevent a safety accident such as flashover, and also prevent the composite cross arm from colliding with the tower due to the rotation angle of the composite cross arm being too large under normal operating conditions.

[0018] In addition, the first limiting member and the second limiting member in the limiting assembly are rotationally connected through the connecting member, under normal operating conditions, the connecting member ensures the connection between the first limiting member and the second limiting member, and thus ensures the limiting of the rotation range of the composite post insulator by the limiting assembly, and under abnormal operating conditions, when the torsional force acting on the composite post insulator gradually increases to be greater than a set threshold, the connecting member is automatically disconnected, the first limiting member and the second limiting member are separated, at this time, the limiting assembly no longer plays a limiting role, and the tension on the composite cross arm is released, so as to reduce the stress on the tower body and reduce the possibility of the tower body overturning under abnormal operating conditions. When the rotation angle of the composite post insulator needs to be limited again, the connecting member only needs to be reinstalled to connect the first limiting member and the second limiting member, which is convenient to operate and can improve the operation and maintenance efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed 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 creating any inventive labor. Among them:

[0020] Figure 1 is a structural schematic diagram of an embodiment of the power transmission tower of the present application;

[0021] Figure 2 is an enlarged schematic diagram of position A in Figure 1

[0022] Figure 3 is a structural schematic diagram of part of the structure in Figure 2

[0023] Figure 4 is a structural schematic diagram of part of the structure in Figure 1 ​​An enlarged schematic view at B;

[0024] Figure 5 is Figure 1 A structural schematic view of the connecting bracket. DETAILED DESCRIPTION

[0025] 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. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0026] Reference is made to Figure 1 , Figure 1 is a structural schematic view of an embodiment of a power transmission tower in the present application, and the power transmission tower 1000 includes a tower body 1100, a composite cross arm 1200, and a connecting rotating assembly 1300.

[0027] The tower body 1100 can be a lattice iron tower, a pole body, or a composite material pole tower, etc. In the embodiment, the tower body 1100 is a lattice iron tower, and only part of the structure is shown in the drawing. Meanwhile, the tower body 1100 is a symmetrical structure, which has a central axis 1101.

[0028] The composite cross arm 1200 is made of composite material, has many advantages such as high strength, light weight, corrosion resistance, easy processing, designability, and good insulation, etc. The composite cross arm 1200 can increase the distance of the power transmission line to the ground without increasing the height of the tower, effectively ensures the safety of the surrounding electrical environment, and can also eliminate the safety hazard of power failure caused by the insufficient electrical distance between the power transmission line and the tower body 1100 due to too large wind deviation.

[0029] The connecting rotating 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. The rotation axis 1201 of the composite cross arm 1200 relative to the tower body 1100 intersects the central axis 1101 of the tower body 1100, and the included angle θ between the two is an acute angle.

[0030] Specifically, under the connection of the connecting rotating assembly 1300, when the composite cross arm 1200 is subjected to an external force of a certain size, it can rotate relative to the tower body 1100 around the rotation axis 1201, release the tension, and reduce the possibility of deformation of the cross arm under stress.

[0031] Meanwhile, the rotating axis 1201 intersects with the central axis 1101 of the tower body 1100, and the included angle θ between the two is an acute angle. Compared with the prior art in which the rotating axis 1201 is perpendicular or parallel to the central axis 1101, the movement stroke of the composite cross arm 1200 in contact with the tower body 1100 can be enlarged, thereby ensuring the safe electrical gap 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 abnormal operating conditions, protecting the power transmission tower 1000, and improving the service life.

[0032] In the embodiment, when the composite cross arm 1200 rotates relative to the tower body 1100, the end portion 1202 of the composite cross arm 1200 away from the tower body 1100 rises in a direction away from the ground.

[0033] Specifically, considering that the end portion 1202 of the composite cross arm 1200 away from the tower body 1100 is usually used for hanging power transmission lines, and is subjected to a force towards the ground, when the composite cross arm 1200 is subjected to an external force and wants to rotate relative to the tower body 1100 under normal operating conditions, the rotation of the composite cross arm 1200 can be prevented by the force acting on the end portion 1202, thereby reducing the rotation amplitude of the composite cross arm 1200 to a certain extent under normal operating conditions.

[0034] In other embodiments, when the composite cross arm 1200 rotates relative to the tower body 1100, the end portion 1202 of the composite cross arm 1200 away from the tower body 1100 can also descend relative to the ground, which is not limited herein.

[0035] Continuing to refer to Figures 1 to 4 In the 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 support insulator 1210 and a composite cable-stayed insulator 1220.

[0036] One end of the composite support insulator 1210 is rotatably connected to the tower body 1100 through the first sub-connecting rotating assembly 1310 and can rotate relative to the tower body 1100 about a first axis 1211, and one end of the composite cable-stayed insulator 1220 is rotatably connected to the tower body 1100 through the second sub-connecting rotating assembly 1320 and can rotate relative to the tower body 1100 about a second axis 1221. The other end of the composite support insulator 1210 away from the tower body 1100 is connected to the other end of the composite cable-stayed insulator 1220 away from the tower body 1100 to form the end portion 1202 of the composite cross arm 1200 away from the tower body 1100, and the first axis 1211 and the second axis 1221 both coincide with the rotating axis 1201 of the composite cross arm 1200 relative to the tower body 1100.

[0037] Specifically, the composite post insulator 1210 rotates relative to the tower body 1100 around the first axis 1211, and the composite cable-stayed insulator 1220 rotates relative to the tower body 1100 around the second axis 1221, so that the composite cross arm 1200 as a whole rotates relative to the tower body 1100 around the rotation axis 1201.

[0038] At the same time, through the above setting, a stable support structure with an included angle is formed between the composite post insulator 1210 and the composite cable-stayed insulator 1220, the stress is reasonable, so that the composite cross arm 1200 is not easy to deform or break under extreme typhoon weather, and the windage flashover accident caused by the power transmission line close to the tower body 1100 due to windage is suppressed, the safe electrical gap between the power transmission line and the tower body 1100 under strong wind conditions is ensured, and the stable performance of user power consumption is ensured.

[0039] In other embodiments, the composite cross arm 1200 can also have other structures, for example, only including the composite post insulator 1210 or the number of composite post insulators 1210 and composite cable-stayed insulators 1220 is more than one. In summary, the structure of the composite cross arm 1200 is not limited in the present application.

[0040] Referring to Figures 1 to 3 In the present embodiment, the first sub-connection rotating assembly 1310 includes a base 1311 and a connection rotating piece 1312.

[0041] The base 1311 is mounted on the tower body 1100. In an application scenario, the base 1311 is mounted on the tower body 1100 by welding, and in other application scenarios, the base 1311 can also be mounted on the tower body 1100 by other means such as bolt connection. The connection between the base 1311 and the tower body 1100 can be fixed connection or movable connection.

[0042] The connection rotating piece 1312 is arranged on the base 1311, connects the composite post insulator 1210, and enables the composite post insulator 1210 to rotate relative to the base 1311 around the first axis 1211, thereby enabling the composite post insulator 1210 to rotate relative to the tower body 1100 around the first axis 1211.

[0043] Specifically, the connection rotating piece 1312 connects the base 1311 and the composite post insulator 1210, so that the composite post insulator 1210 can rotate relative to the base 1311 around the first axis 1211, thereby enabling the composite post insulator 1210 to rotate relative to the tower body 1100 around the first axis 1211.

[0044] Continuing to refer to Figures 1 to 3 In the present embodiment, the connection rotating piece 1312 includes a rotating rod 13121 and a first connecting plate 13122.

[0045] The rotating rod 13121 extends along the direction of the first axis 1211, is arranged on the base 1311, and can rotate relative to the base 1311 around the first axis 1211. The rotating rod 13121 is connected with the composite post insulator 1210, so that the composite post insulator 1210 can rotate relative to the base 1311, thereby realizing that the composite post insulator 1210 can rotate relative to the tower body 1100. That is, after the composite post insulator 1210 is connected with the rotating rod 13121, the composite post insulator 1210 can rotate relative to the base 1311 around the first axis 1211, thereby rotating relative to the tower body 1100 around the first axis 1211.

[0046] In an application scenario, as shown in Figure 3 The rotating rod 13121 has a hollow structure, and a connecting member such as a bolt is arranged to pass through the rotating rod 13121 to connect the rotating rod 13121 with the base 1311, and to enable the rotating rod 13121 to rotate around the connecting member on the base 1311.

[0047] In other embodiments, the rotating rod 13121 itself can also be directly connected with the base 1311 as a rotating shaft, so that the composite post insulator 1210 rotates relative to the base 1311 around the first axis 1211, which is not specifically limited here.

[0048] The first connecting plate 13122 is connected with the rotating rod 13121, and the number of the first connecting plate 13122 is two. The two first connecting plates 13122 are oppositely arranged along the circumference of the rotating rod 13121, and are used to clamp the connecting fittings on the end of the composite post insulator 1210, thereby realizing the connection between the rotating rod 13121 and the composite post insulator 1210.

[0049] Specifically, the two first connecting plates 13122 are arranged to clamp the connecting fittings on the end of the composite post insulator 1210 to realize the connection between the rotating rod 13121 and the composite post insulator 1210, which can ensure the connection strength between the rotating rod 13121 and the composite post insulator 1210. The two first connecting plates 13122 and the connecting fittings on the end of the composite post insulator 1210 can be connected together by welding, or can be connected together by using locking members such as bolts.

[0050] For ease of description, the connecting fittings on the end of the composite post insulator 1210 are defined as first fittings. In this embodiment, as shown in Figure 2 The first fittings 1212 are flat-footed fittings.

[0051] In other embodiments, the connecting rotating member 1312 can also not include the first connecting plate 13122, in which case the first fitting 1212 can be directly connected to the rotating rod 13121, for example, by welding.

[0052] The above describes that the composite post insulator 1210 is fixedly connected to the rotating rod 13121, but the present application is not limited thereto, and in other embodiments, the composite post insulator 1210 can also be movably connected to the rotating rod 13121, as long as the composite post insulator 1210 can rotate relative to the tower body 1100 about the first axis 1211 under the driving of the rotating rod 13121.

[0053] Meanwhile, in other embodiments, the number of the first connecting plate 13122 can also be one, three or even more. In summary, the present application does not limit the specific connection of the connecting rotating member 1312.

[0054] Referring to Figure 1 , Figure 4 and Figure 5 , in the present embodiment, the second sub connecting rotating assembly 1320 includes a connecting bracket 1321 and a second connecting plate 1322.

[0055] 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 can also be installed on the tower body 1100 by other means such as bolt connection. The connection between the connecting bracket 1321 and the tower body 1100 can be fixed or movable.

[0056] 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 in the figure) extending along the second axis 1221, so that the cable-stayed composite insulator can rotate relative to the connecting bracket 1321, thereby realizing that 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 relative to the second connecting plate 1322 about the second axis 1221, and then rotate relative to the tower body 1100 about the second axis 1221.

[0057] In the present embodiment, the second connecting plate 1322 is fixedly connected to the connecting bracket 1321. In other embodiments, the second connecting plate 1322 can also be movably connected to the connecting bracket 1321.

[0058] The connecting shaft (not shown in the figure) is arranged through the second connecting plate 1322 and the connecting hardware on the end of the composite cathead insulator 1220 to achieve the rotational connection between the second connecting plate 1322 and the composite cathead insulator 1220. In an application scenario, the connecting shaft is a bolt.

[0059] For the convenience of description, the connecting hardware on the end of the composite cathead insulator 1220 is defined as the second hardware. In the embodiment, as shown in Figure 4 , the second hardware 1222 is a U-shaped hardware, and the second connecting plate 1322 is clamped in the U-shaped hardware at this time.

[0060] Specifically, the arrangement of the connecting bracket 1321 can shorten the length of the composite cathead insulator 1220 to improve the economy while ensuring the safe electrical clearance, and can also expand the angle between the composite cathead insulator 1220 and the composite post insulator 1210 to improve the tensile capacity of the composite cathead insulator 1220 and avoid the collision between the grading device (not shown in the figure) on the composite cathead insulator 1220 and the grading device (not shown in the figure) on the composite post insulator 1210.

[0061] Referring to Figure 4 and Figure 5 , in the embodiment, the connecting bracket 1321 includes at least two connecting rods 13211.

[0062] One end of the at least two connecting rods 13211 is connected with the second connecting plate 1322, and the other end of the at least two connecting rods 13211 is radially expanded around the second connecting plate 1322 and connected with the tower body 1100.

[0063] The number of the connecting rods 13211 can be two, three, four (as shown in Figure 4 and Figure 5 ), or more, which is not limited herein.

[0064] Specifically, the above arrangement enables the tensile force borne by the composite cathead insulator 1220 to be dispersedly transmitted to the tower body 1100, which can avoid the disconnection of the connection between the composite cathead insulator 1220 and the tower body 1100 due to the concentrated transmission of the tensile force, thereby ensuring the connection firmness between the composite cathead insulator 1220 and the tower body 1100.

[0065] In an application scenario, in order to ensure the uniform stress of the tower body 1100, the connecting bracket 1321 is a symmetrical structure, and the at least two connecting rods 13211 are arranged symmetrically relative to a certain plane at this time.

[0066] Continuing to refer to Figure 4 and Figure 5 , in the embodiment, the connecting bracket 1321 further includes a mounting plate 13212.

[0067] The mounting plate 13212 connects the second connecting plate 1322 and the at least two connecting rods 13211.

[0068] Specifically, the mounting plate 13212 can further increase the length of the connecting bracket 1321, and in turn can shorten the length of the composite cathead insulator 1220 while ensuring the safe electrical clearance, thereby improving the economy.

[0069] In an application scenario, as shown in Figure 4 and Figure 5 , the second connecting plate 1322 is connected to one end of the mounting plate 13212, and the end portions of the at least two connecting rods 13211 abut on the plate surface of the mounting plate 13212.

[0070] 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 fixed connections, but the application is not limited thereto. 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 can also be movable connections.

[0071] In other embodiments, the connecting bracket 1321 can also not include the mounting plate 13212, and in this case, the at least two connecting rods 13211 can be directly connected to the second connecting plate 1322.

[0072] Referring to Figure 1 , Figure 2 and Figure 3 , in the embodiment, the power transmission tower 1000 further includes a limiting assembly 1400.

[0073] The number of the limiting assembly 1400 is two, and the two limiting assemblies 1400 are respectively arranged on the two sides of the composite post insulator 1210 along the direction in which the composite post insulator 1210 rotates relative to the tower body 1100 and are respectively connected to the tower body 1100, for limiting the maximum angle at which the composite post insulator 1210 rotates relative to the tower body 1100.

[0074] Specifically, the limiting assembly 1400 ensures the rotation range of the composite cross arm 1200 under normal operating conditions, so as to avoid that the electrical clearance between the composite cross arm 1200 and the tower body 1100 is too small after the composite cross arm 1200 rotates too much, thereby causing a safety accident such as flashover.

[0075] In an application scenario, the two limiting assemblies 1400 are symmetrically arranged on the two sides of the composite post insulator 1210.

[0076] Referring to Figure 2 andFigure 3 In the embodiment, the limiting assembly 1400 comprises a first limiting piece 1410 and a second limiting piece 1420.

[0077] One end of the first limiting piece 1410 is connected with the composite post insulator 1210, and one end of the second limiting piece 1420 is connected with the tower body 1100, and the other end of the second limiting piece 1420 is movably connected with the other end of the first limiting piece 1410 away from the composite post insulator 1210, and the relative moving distance of the two is limited within a preset distance range.

[0078] Specifically, the movable distance of the other end of the first limiting piece 1410 away from the composite post insulator 1210 relative to the other end of the second limiting piece 1420 away from the tower body 1100 is limited within a preset distance range, so that the relative moving distance of the first limiting piece 1410 relative to the second limiting piece 1420 is limited within a preset distance range, and since one end of the first limiting piece 1410 is connected with the composite post insulator 1210 and one end of the second limiting piece 1420 is connected with the tower body 1100, the rotation angle of the composite post insulator 1210 relative to the tower body 1100 is limited within a preset angle range, so that the limiting assembly 1400 plays a limiting role.

[0079] In the embodiment, one end of the first limiting piece 1410 is fixedly connected with the composite post insulator 1210, and one end of the second limiting piece 1420 is fixedly connected with the tower body 1100, but the application is not limited thereto, and in other embodiments, one end of the first limiting piece 1410 can also be movably connected with the composite post insulator 1210, and one end of the second limiting piece 1420 can also be movably connected with the tower body 1100, as long as the rotation angle of the composite post insulator 1210 relative to the tower body 1100 is limited within an angle range under the action of the limiting assembly 1400.

[0080] In an application scenario, the first limiting piece 1410 and the first fitting 1212 on the composite post insulator 1210 are directly connected.

[0081] In another application scenario, the first limiting piece 1410 and the connecting rotating piece 1312 are connected to realize the connection of the first limiting piece 1410 and the composite post insulator 1210. Specifically, referring to Figures 2 to 3 At this time, the connecting rotating piece 1312 further comprises a third connecting plate 13123 connected to the periphery of the rotating rod 13121, the first limiting piece 1410 and the third connecting plate 13123 are connected to realize the connection with the connecting rotating piece 1312, and further realize the connection with the composite post insulator 1210.

[0082] In this application scenario, in order to ensure the connection strength, the number of the first limit members 1410 is two, the third connecting plate 13123 is clamped at one end of the two first limit members 1410, and the second limit member 1420 is clamped at the other end of the two first limit members 1410. Of course, in other application scenarios, the number of the first limit members 1410 can also be one.

[0083] With reference to Figure 2 and Figure 3 In this embodiment, the limit assembly 1400 further includes a connecting member 1430. The connecting member 1430 connects the other end of the second limit member 1420 away from the tower body 1100 and the other end of the first limit member 1410 away from the composite post insulator 1210, so that the other end of the second limit member 1420 away from the tower body 1100 can move relative to the other end of the first limit member 1410 away from the composite post insulator 1210; wherein when the external force acting on the composite cross arm 1200 is greater than a set threshold, the connecting member 1430 automatically disconnects to separate the first limit member 1410 and the second limit member 1420, and the limit assembly 1400 is disabled.

[0084] Specifically, under normal operating conditions, the connecting member 1430 ensures the connection of the first limit member 1410 and the second limit member 1420, at this time the composite cross arm 1200 can rotate within a limited angle range, avoiding that the composite cross arm 1200 is too close to the tower body within the normal stress range to cause abnormal discharge; and when encountering a typhoon or other abnormal operating conditions, the torsional force acting on the composite cross arm 1200 will gradually increase, when the torsional force gradually increases to be greater than the set threshold, the connecting member 1430 automatically disconnects, the first limit member 1410 and the second limit member 1420 are separated, at this time the limit assembly 1400 will no longer limit the rotation angle of the composite cross arm 1200, and the tension on the composite cross arm 1200 can be released, thereby reducing the stress on the tower body 1100 and reducing the possibility of the tower body 1100 overturning under abnormal operating conditions.

[0085] And when it is needed again to limit the rotation angle of the composite post insulator 1210 by the limit assembly 1400, it only needs to reinstall the connecting member 1430, which is convenient to operate and can improve the operation and maintenance efficiency.

[0086] In one application scenario, the connecting member 1430 is a shear bolt.

[0087] In one application scenario, as Figure 2 and Figure 3As shown, the connecting piece 1430 is fixedly connected with the second limiting piece 1420 and movably connected with the first limiting piece 1410, so as to realize the movable connection of the first limiting piece 1410 and the second limiting piece 1420, and at this time, the first limiting piece 1410 is provided with a through hole 1411, the through hole 1411 is a waist-shaped hole, and the connecting piece 1430 can only slide in the through hole 1411, so as to realize that the moving distance of the first limiting piece 1410 relative to the second limiting piece 1420 is limited within a preset distance range.

[0088] In another application scenario, the second limiting piece 1420 can also be provided with a through hole 1411, and the connecting piece 1430 is fixedly connected with the first limiting piece 1410 and movably connected with the second limiting piece 1420.

[0089] Meanwhile, in other embodiments, the limiting assembly 1400 can also not include the connecting piece 1430, at this time, the first limiting piece 1410 and the second limiting piece 1420 are directly rotationally connected, for example, one of the first limiting piece 1410 and the second limiting piece 1420 is provided with a convex column, and the other is provided with a concave groove, the convex column is slidingly arranged in the concave groove, so as to realize the movable connection of the first limiting piece 1410 and the second limiting piece 1420 and the relative moving distance of the two is limited within a preset distance range.

[0090] In summary, the application does not limit how the first limiting piece 1410 and the second limiting piece 1420 are movably connected.

[0091] The above is only the embodiment of the application, and does not limit the patent scope of the application, 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 application.

Claims

1. A power transmission tower, characterized in that, The power transmission tower comprises: a tower body; a composite cross arm comprising a composite catenary insulator and a composite post insulator; a connecting rotating assembly connecting the tower body and the composite cross arm and enabling the composite cross arm to rotate relative to the tower body about a rotating axis, the angle between the rotating axis and the center line of the tower body being an acute angle; a limiting assembly for limiting the maximum angle of rotation of the composite cross arm relative to the tower body; wherein when the composite cross arm rotates relative to the tower body, the end of the composite cross arm away from the tower body rises towards the direction away from the ground; wherein the number of the limiting assemblies is two, and the two limiting assemblies are respectively arranged on the two sides of the composite post insulator along the direction of rotation of the composite post insulator relative to the tower body and are respectively connected with the tower body; wherein the limiting assembly comprises a first limiting member, a second limiting member and a connecting member, one end of the first limiting member is connected with the composite post insulator, one end of the second limiting member is connected with the tower body, the other end of the second limiting member is movably connected with the other end of the first limiting member away from the composite post insulator, and the relative movement distance of the two is limited within a preset distance range, so that the rotation angle of the composite post insulator relative to the tower body is limited within a preset angle range; the connecting member connects the other end of the second limiting member away from the tower body with the other end of the first limiting member away from the composite post insulator, so that the other end of the second limiting member away from the tower body can move relative to the other end of the first limiting member away from the composite post insulator; when the external force acting on the composite cross arm is greater than a set threshold, the connecting member is automatically disconnected to separate the first limiting member from the second limiting member, and the limiting assembly is disabled.

2. The power transmission tower of claim 1, wherein, The connecting rotating assembly comprises a first sub-connecting rotating assembly and a second sub-connecting rotating assembly; one end of the composite post insulator is connected to the tower body through the first sub-connecting rotating assembly, and one end of the composite catenary insulator is connected to the tower body through the second sub-connecting rotating assembly; the other end of the composite catenary insulator and the other end of the composite post insulator are connected with each other.

3. The power transmission tower of claim 2, wherein, The composite post insulator rotates relative to the first sub-connecting rotating assembly about a first axis, and the composite catenary insulator rotates relative to the second sub-connecting rotating assembly about a second axis, the first axis and the second axis coincide with the rotating axis.

4. The power transmission tower of claim 3, wherein, The composite post insulator is connected with the limiting assembly through the first sub-connecting rotating assembly.

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