Power transmission tower

Abstract

The application discloses a power transmission tower, which comprises a tower body, a composite cross arm and a connecting rotating assembly. The connecting rotating assembly connects the tower body and the composite cross arm and enables the composite cross arm to rotate relative to the tower body. The rotating axis of the composite cross arm relative to the tower body intersects with the central axis of the tower body, and the included angle between the two is an acute angle. The power transmission tower can reduce the probability of collision between the composite cross arm and the tower body under abnormal 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 a power transmission line, 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 the tower body being damaged by excessive stress and the composite cross arm colliding with the 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; and 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, wherein the rotation axis of the composite cross arm relative to the tower body intersects the central axis of the tower body, and the included angle between the two is an acute angle.

[0006] 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.

[0007] Wherein, the connecting rotating component comprises a first sub-connecting rotating component and a second sub-connecting rotating component, the composite cross arm comprises: a composite post insulator, one end of which is rotatably connected to the tower body through the first sub-connecting rotating component and can rotate relative to the tower body around a first axis; a composite cable-stayed insulator, one end of which is rotatably connected to the tower body through the second sub-connecting rotating component and can rotate relative to the tower body around a second axis; wherein the other end of the composite post insulator away from the tower body is connected to the other end of the composite cable-stayed insulator away from the tower body to form the end of the composite cross arm away from the tower body, and the first axis and the second axis both coincide with the rotation axis of the composite cross arm relative to the tower body.

[0008] The first sub-connection rotating assembly comprises a base installed on the tower body, and a connecting rotating piece arranged on the base and connected with the composite post insulator, so that the composite post insulator can rotate relative to the base around the first axis, thereby realizing that the composite post insulator can rotate relative to the tower body around the first axis.

[0009] The connecting rotating piece comprises a rotating rod extending along the first axis direction, the rotating rod being rotatably arranged on the base and capable of rotating relative to the base around the first axis, wherein the rotating rod is connected with the composite post insulator, and a first connecting plate connected with the rotating rod, the number of the first connecting plates being two, the two first connecting plates being oppositely arranged along the circumferential direction of the rotating rod and used for clamping the connecting fittings on the end portions of the composite post insulator.

[0010] The second sub-connection rotating assembly comprises a connecting support installed on the tower body, and a second connecting plate having one end connected with the connecting support and the other end rotatably connected with the composite cable-stayed insulator through a connecting shaft extending along the second axis direction, so that the cable-stayed composite insulator can rotate relative to the connecting support, thereby realizing that the composite cable-stayed insulator can rotate relative to the tower body.

[0011] The connecting support comprises at least two connecting rods, one end of each of the at least two connecting rods being connected with the second connecting plate, and the other end of each of the at least two connecting rods being radially arranged around the second connecting plate and connected with the tower body.

[0012] The power transmission tower further comprises two limiting assemblies, the two limiting assemblies being arranged on the two sides of the composite post insulator along the direction in which the composite post insulator rotates relative to the tower body and connected with the tower body, respectively, and used for limiting the maximum angle at which the composite post insulator rotates relative to the tower body.

[0013] The limiting assembly comprises a first limiting piece having one end connected with the composite post insulator, and a second limiting piece having one end connected with the tower body and the other end movably connected with the other end of the first limiting piece away from the composite post insulator, and the relative movement distance of the two ends is limited within a preset distance range.

[0014] The limiting assembly further comprises 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 post insulator, 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 post insulator; wherein when the external force acting on the composite cross arm is greater than the set threshold, the connecting piece is automatically disconnected to separate the first limiting piece from the second limiting piece.

[0015] The beneficial effects of the present application are: on the one hand, the composite cross arm is arranged to rotate relative to the tower body, which can release the tension on the composite cross arm and reduce the possibility of stress deformation of the composite cross arm; on the other hand, the rotation axis of the composite cross arm rotating relative to the tower body intersects the central axis of the tower body, and the included angle between the two is an acute angle. Compared with the prior art in which the rotation axis is perpendicular or parallel to the central axis, the movement stroke of the composite cross arm in contact with the tower body can be enlarged, 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 improving the service life.

[0016] Considering that the end of the composite cross arm away from the tower body is usually used to hang the power transmission line, and the force acting on it is directed towards the ground, when the composite cross arm is arranged to rotate relative to the tower body, the end of the composite cross arm away from the tower body is raised in the direction away from the ground. Therefore, when the composite cross arm wants to rotate relative to the tower body, the force acting on the end of the composite cross arm away from the tower body can prevent the composite cross arm from rotating, thereby reducing the rotation amplitude of the composite cross arm under normal operating conditions to a certain extent.

[0017] Meanwhile, the limiting assembly is arranged on both sides of the composite post insulator in the direction of rotation of the composite post insulator relative to the tower body, which limits the amplitude of rotation of the composite cross arm under normal operating conditions, avoids the electrical clearance between the composite cross arm and the tower body being too small after the composite cross arm rotates too much, thereby causing a flashover and other safety accidents, and also prevents the composite cross arm from rotating too much under normal operating conditions and colliding with the tower.

[0018] The first limiting piece and the second limiting piece in the limiting assembly are rotationally connected through a connecting piece. In normal working conditions, the connecting piece ensures the connection of the first limiting piece and the second limiting piece, thereby ensuring the limiting of the rotation amplitude of the composite post insulator by the limiting assembly. In abnormal working conditions, when the torsional force received by the composite post insulator gradually increases to be greater than a set threshold, the connecting piece is automatically disconnected, and the first limiting piece and the second limiting piece are separated. At this time, the limiting assembly no longer plays a limiting role, and the tension on the composite cross arm is released, thereby reducing the stress on the tower body and reducing the possibility of overturning of the tower body in abnormal working conditions. When the rotation angle of the composite post insulator needs to be limited again, only the connecting piece needs to be reinstalled to connect the first limiting piece and the second limiting piece, 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 creative 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 A in Figure 1

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

[0023] Figure 4 is an enlarged schematic diagram of B in Figure 1

[0024] Figure 5 is a structural schematic diagram of the connecting bracket in Figure 1 DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0026] Reference is made to Figure 1 , Figure 1 ​​​​is a structural schematic diagram of an embodiment of the power transmission tower of the present application, the power transmission tower 1000 comprising 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 figure. 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, which has many advantages such as high strength, light weight, corrosion resistance, easy processing, designability, and good insulation, etc. It can increase the distance of the power transmission line to the ground without increasing the height of the tower, effectively protect the safety of the surrounding electrical environment, and 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 rotation axis 1201 intersects 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 rotation 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 1202 of the composite cross arm 1200 away from the tower body 1100 rises in the direction away from the ground.

[0033] Specifically, considering that the end 1202 of the composite cross arm 1200 away from the tower body 1100 is usually used for hanging the power transmission line, the force acting on the end 1202 is towards the ground, thus when the composite cross arm 1200 is subjected to external force and tends 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 1202, so as to reduce the rotation range of the composite cross arm 1200 to a certain extent under normal operating conditions.

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

[0035] Continuing to refer to Figures 1 to 4 In the embodiment, the connecting rotating assembly 1300 comprises a first sub connecting rotating assembly 1310 and a second sub connecting rotating assembly 1320, and the composite cross arm 1200 comprises a composite post insulator 1210 and a composite cable-stayed insulator 1220.

[0036] The composite post insulator 1210 is rotatably connected to the tower body 1100 at one end through the first sub connecting rotating assembly 1310 and can rotate relative to the tower body 1100 about a first axis 1211, and the composite cable-stayed insulator 1220 is rotatably connected to the tower body 1100 at one end through the second sub connecting rotating assembly 1320 and can rotate relative to the tower body 1100 about a second axis 1221, wherein the other end of the composite post 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 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 a rotating axis 1201 of the composite cross arm 1200 relative to the tower body 1100.

[0037] Specifically, the rotation of the composite post insulator 1210 relative to the tower body 1100 about the first axis 1211 and the rotation of the composite cable-stayed insulator 1220 relative to the tower body 1100 about the second axis 1221 make the whole composite cross arm 1200 rotate relative to the tower body 1100 about the rotating axis 1201.

[0038] Meanwhile, the above arrangement can also form a stable support structure with an included angle between the composite post insulator 1210 and the composite cable-stayed insulator 1220, so that the force is reasonable, thus under extreme typhoon weather, the composite cross arm 1200 is not easy to deform or break, and the windage flashover accident caused by the power transmission line approaching the tower body 1100 due to wind swing can be prevented, 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 be other structures, for example, only including the composite post insulator 1210 or the number of the composite post insulator 1210 and the composite cable-stayed insulator 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. 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 about the first axis 1211, thereby enabling the composite post insulator 1210 to rotate relative to the tower body 1100 about 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 about the first axis 1211, thereby enabling the composite post insulator 1210 to rotate relative to the tower body 1100 about 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 and is rotatably arranged on the base 1311 and can rotate relative to the base 1311 about the first axis 1211. At the same time, the rotating rod 13121 is connected with the composite post insulator 1210 to enable the composite post insulator 1210 to rotate relative to the base 1311, thereby enabling the composite post insulator 1210 to 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 about the first axis 1211, and in turn relative to the tower body 1100 about the first axis 1211.

[0046] In an application scenario, as Figure 3As shown, the rotating rod 13121 is in a hollow structure, 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 make the rotating rod 13121 rotate around the connecting member on the base 1311.

[0047] In other embodiments, the rotating rod 13121 can also be directly connected with the base 1311 as a rotating shaft, so that the composite post insulator 1210 rotates around the first axis 1211 relative to the tower body 1100, 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, so as to realize 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] In order to facilitate the description, the connecting fittings on the end of the composite post insulator 1210 are defined as first fittings. In this embodiment, as shown in the figure, the first fittings 1212 are flat-footed fittings. Figure 2

[0051] In other embodiments, the connecting rotating member 1312 can also not include the first connecting plate 13122, at this time, the first fittings 1212 can be directly connected with the rotating rod 13121, for example, the first fittings 1212 are directly connected with the rotating rod 13121 by welding.

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

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

[0054] Referring to Figure 1 , Figure 4 and Figure 5 , in the 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. 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 with the connecting bracket 1321, and the other end is rotatably connected with the composite cathead insulator 1220 through a connecting shaft (not shown in the figure) extending along the second axis 1221, so that the cathead composite insulator can rotate relative to the connecting bracket 1321, and then the cathead composite insulator 1220 can rotate relative to the tower body 1100. That is, after the cathead composite insulator 1220 is connected with the second connecting plate 1322, the cathead composite insulator 1220 can rotate relative to the second connecting plate 1322 around the second axis 1221, and then rotate relative to the tower body 1100 around the second axis 1221.

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

[0058] The connecting shaft (not shown in the figure) is arranged through the connecting fittings on the end of the second connecting plate 1322 and the composite cathead insulator 1220 to realize the rotatable 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 fittings on the end of the composite cathead insulator 1220 are defined as second fittings. In the embodiment, as shown in Figure 4 , the second fittings 1222 are U-shaped fittings, and the second connecting plate 1322 is clamped in the U-shaped fittings.

[0060] Specifically, the arrangement of the connecting bracket 1321 can shorten the length of the composite catenary insulator 1220 and improve the economy while ensuring the safe electrical clearance, and can also expand the angle between the composite catenary insulator 1220 and the composite post insulator 1210, improve the tensile capacity of the composite catenary insulator 1220, and avoid the collision between the grading device (not shown in the figure) on the composite catenary 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 this 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 catenary insulator 1220 to be dispersedly transmitted to the tower body 1100, which can avoid the disconnection of the composite catenary insulator 1220 and the tower body 1100 due to the concentrated transmission of the tensile force, thereby ensuring the connection firmness between the composite catenary 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 symmetrically arranged relative to a certain plane.

[0066] Referring to Figure 4 and Figure 5 In this embodiment, the connecting bracket 1321 further includes a mounting plate 13212.

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

[0068] Specifically, the arrangement of the mounting plate 13212 can further increase the length of the connecting bracket 1321, and thus the length of the composite catenary insulator 1220 can be shortened while ensuring the safe electrical clearance, thereby improving the economy.

[0069] In an application scenario, as shown in Figure 4 and Figure 5As shown, the second connecting plate 1322 is connected to one end of the mounting plate 13212, and the end of each of the at least two connecting rods 13211 abuts 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 support 1321 can also not include the mounting plate 13212, and 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 arrangement of 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 and Figure 3 , in the embodiment, the limiting assembly 1400 includes a first limiting piece 1410 and a second limiting piece 1420.

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

[0078] Specifically, the movable distance of the one end of the first limiting member 1410 away from the composite post insulator 1210 relative to the one end of the second limiting member 1420 away from the tower body 1100 is limited within a preset distance range, so that the relative moving distance of the first limiting member 1410 relative to the second limiting member 1420 is limited within the preset distance range, and since the one end of the first limiting member 1410 is connected with the composite post insulator 1210 and the one end of the second limiting member 1420 is connected with the tower body 1100, the rotating 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, the one end of the first limiting member 1410 is fixedly connected with the composite post insulator 1210 and the one end of the second limiting member 1420 is fixedly connected with the tower body 1100, but the application is not limited thereto, in other embodiments, the one end of the first limiting member 1410 can be movably connected with the composite post insulator 1210 and the one end of the second limiting member 1420 can be movably connected with the tower body 1100, as long as the rotating 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 member 1410 and the first fittings 1212 on the composite post insulator 1210 are directly connected.

[0081] In another application scenario, the first limiting member 1410 and the connecting rotating member 1312 are connected to realize the connection between the first limiting member 1410 and the composite post insulator 1210. Specifically, referring to Figures 2 to 3 At this time, the connecting rotating member 1312 further includes a third connecting plate 13123, the third connecting plate 13123 is connected to the periphery of the rotating rod 13121, the first limiting member 1410 and the third connecting plate 13123 are connected to realize the connection with the connecting rotating member 1312, and then 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 limiting member 1410 is two, the third connecting plate 13123 is clamped between the one ends of the two first limiting members 1410, and the second limiting member 1420 is clamped between the other ends of the two first limiting members 1410. Of course, in other application scenarios, the number of the first limiting member 1410 can also be one.

[0083] Continuing to refer to Figure 2 and Figure 3In the embodiment, the limiting assembly 1400 further comprises a connecting piece 1430. The connecting piece 1430 connects the other end of the second limiting piece 1420 away from the tower body 1100 and the other end of the first limiting piece 1410 away from the composite support insulator 1210, so that the other end of the second limiting piece 1420 away from the tower body 1100 can move relative to the other end of the first limiting piece 1410 away from the composite support insulator 1210; wherein when the external force acting on the composite cross arm 1200 is greater than a set threshold, the connecting piece 1430 is automatically disconnected to separate the first limiting piece 1410 and the second limiting piece 1420.

[0084] Specifically, under normal working conditions, the connecting piece 1430 ensures the connection of the first limiting piece 1410 and the second limiting piece 1420, at this time the composite cross arm 1200 can rotate within a limited angle range, avoiding abnormal discharge caused by the composite cross arm 1200 being too close to the tower body within the normal stress range; and when encountering typhoon and other abnormal working conditions, the torsional force acting on the composite cross arm 1200 gradually increases, when the torsional force gradually increases to be greater than the set threshold, the connecting piece 1430 is automatically disconnected, the first limiting piece 1410 and the second limiting piece 1420 are separated, at this time the limiting assembly 1400 no longer limits 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 working conditions.

[0085] When it is necessary for the limiting assembly 1400 to limit the rotation angle of the composite support insulator 1210 again, it only needs to reinstall the connecting piece 1430, which is convenient to operate and can improve the operation and maintenance efficiency.

[0086] In an application scenario, the connecting piece 1430 is a shear bolt.

[0087] In an application scenario, as shown in Figure 2 and Figure 3 , 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 limit the movement distance of the first limiting piece 1410 relative to the second limiting piece 1420 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 which 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 protruding column, and the other is provided with a recess, the protruding column is slidingly arranged in the recess, thereby realizing movable connection of the first limiting piece 1410 and the second limiting piece 1420 and limiting the relative movement distance of the two within a preset distance range.

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

[0091] The above is only an embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation using the content of the specification and drawings of the present application, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A power transmission tower, characterized in that, The power transmission tower comprises: a tower body; a composite cross arm comprising a composite post insulator and a composite cable-stayed 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, wherein the rotating axis of the composite cross arm relative to the tower body intersects the central axis of the tower body and the included angle therebetween is an acute angle; 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 in a direction away from the ground; 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 can rotate relative to the tower body around a first axis, and one end of the composite cable-stayed insulator is connected to the tower body through the second sub-connecting rotating assembly and can rotate relative to the tower body around a second axis; wherein the other end of the composite post insulator away from the tower body is connected to the other end of the composite cable-stayed insulator away from the tower body to form the end of the composite cross arm away from the tower body, and the first axis and the second axis both coincide with the rotating axis of the composite cross arm relative to the tower body; wherein the first sub-connecting rotating assembly comprises a base and a connecting rotating piece, the base is installed on the tower body, the connecting rotating piece is arranged on the base and connected to the composite post insulator and enables the composite post insulator to rotate relative to the base around the first axis, thereby enabling the composite post insulator to rotate relative to the tower body around the first axis, and the second sub-connecting rotating assembly comprises a connecting support, one end of the connecting support is installed on the tower body, and the other end is connected to the composite cable-stayed insulator.

2. The power transmission tower of claim 1, wherein, The connecting rotating piece comprises: a rotating rod extending along the direction of the first axis, the rotating rod is rotatably arranged on the base and can rotate relative to the base around the first axis, wherein the rotating rod is connected to the composite post insulator; a first connecting plate connected to the rotating rod, the number of the first connecting plates is two, the two first connecting plates are oppositely arranged along the circumference of the rotating rod and are used for clamping the connecting fittings on the end of the composite post insulator.

3. The power transmission tower of claim 1, wherein, The second sub-connecting rotating assembly further comprises: a second connecting plate, one end of the second connecting plate is connected to the connecting support, and the other end of the second connecting plate is rotatably connected to the composite cable-stayed insulator through a connecting shaft extending along the direction of the second axis, thereby enabling the composite cable-stayed insulator to rotate relative to the connecting support and enabling the composite cable-stayed insulator to rotate relative to the tower body.

4. The power transmission tower of claim 3, wherein, The connecting support comprises: at least two connecting rods, one end of each of the at least two connecting rods is connected to the second connecting plate, and the other end of each of the at least two connecting rods is radially arranged around the second connecting plate and is connected to the tower body.

5. The power transmission tower of claim 1, wherein, The power transmission tower further comprises: Two position-limiting assemblies are arranged on two sides of the composite post insulator respectively and connected with the tower body, for limiting the maximum angle of rotation of the composite post insulator relative to the tower body.

6. The power transmission tower of claim 5, wherein, The position-limiting assembly comprises: a first position-limiting member connected with the composite post insulator at one end; a second position-limiting member connected with the tower body at one end and movably connected with the other end of the first position-limiting member away from the composite post insulator, and the relative moving distance of the two is limited within a preset distance range.

7. The power transmission tower of claim 6, wherein, The position-limiting assembly further comprises: a connecting member connecting the other end of the second position-limiting member away from the tower body with the other end of the first position-limiting member away from the composite post insulator, so that the other end of the second position-limiting member away from the tower body can move relative to the other end of the first position-limiting member away from the composite post insulator; wherein 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 position-limiting member from the second position-limiting member.

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