Composite crossarms and transmission towers

Abstract

The present application discloses a composite crossarm and a transmission tower. The composite crossarm includes a post insulator and three diagonal insulators. One end of each of the post insulator and the diagonal insulator is connected to the tower body of the transmission tower. The other ends are connected together to form a composite crossarm for hanging the end of the transmission line. The three diagonal insulators are spaced apart around the post insulator, and the axes of two of the diagonal insulators are coplanar with the axis of the post insulator. The two diagonal insulators whose axes are coplanar with the axis of the post insulator are defined as first diagonal insulators, and the remaining diagonal insulators are defined as second diagonal insulators. The angle between the two first diagonal insulators ranges from 45° to 90°, and the angle between the second diagonal insulator and the post insulator ranges from 25° to 45°. The composite crossarm provided by the present application has high stability.

Description

Technical Field

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

[0002] Composite materials are one of the ideal materials for constructing transmission tower structures due to their advantages such as light weight, high strength, corrosion resistance, easy processing, designability and good insulation performance. Towers made of composite materials have the advantages of light tower weight, small tower head size, light structure, easy processing and molding, low transportation and assembly costs, corrosion resistance, high and low temperature resistance, high strength, low possibility of theft and low line maintenance costs.

[0003] The inventors of this application have discovered that the performance of current towers made of composite materials needs to be improved. Furthermore, current composite crossarms are generally composed of a combination of post insulators and diagonal insulators. While these crossarms come in various configurations, including single-post, single-post single-pull, and dual-post single-pull, the stability of these composite crossarms still needs to be improved. Summary of the Invention

[0004] The purpose of this application is to provide a composite crossarm and a transmission tower that can ensure the stability of the composite crossarm.

[0005] To solve the above technical problems, a technical solution adopted in the present application is: providing a composite crossarm, wherein the composite crossarm includes a post insulator and three diagonal insulators, wherein one end of the post insulator and the diagonal insulator are used to be connected to the tower body of the transmission tower, and the other ends are connected together to form the composite crossarm for hanging the end of the transmission line, wherein the three diagonal insulators are arranged at intervals around the post insulator, and the axes of two of the diagonal insulators are in the same plane as the axis of the post insulator, and the two diagonal insulators whose axes are in the same plane as the axis of the post insulator are defined as first diagonal insulators, and the remaining diagonal insulators are defined as second diagonal insulators, wherein the angle between the two first diagonal insulators ranges from 45° to 90°, and the angle between the second diagonal insulator and the post insulator ranges from 25° to 45°.

[0006] On the one hand, the composite cross-arm is provided with a post insulator and three oblique insulators connected together to form an end for hanging a transmission line, so that a stable triangular structure is formed between the composite cross-arm and the tower body, which can greatly improve the stability of the composite cross-arm. On the other hand, the angle range between the two first oblique insulators is set to 45° to 90°, which provides favorable conditions for setting a first grading ring on the high-voltage end of the post insulator (the end away from the tower body) and the end fittings for setting a second grading ring on the high-voltage end (the end away from the tower body) of the two first oblique insulators. In addition, the angle range between the second oblique insulator and the post insulator is set to 25° to 45°, which provides favorable conditions for setting the first grading ring on the high-voltage end of the post insulator and the third grading ring on the high-voltage end (the end away from the tower body) of the second oblique insulator.

[0007] The distances between the second oblique-pull insulator and the two first oblique-pull insulators are equal.

[0008] The above arrangement of equal distances between the second oblique-pull insulator and the two first oblique-pull insulators can make the composite cross-arm have a symmetrical structure, further improving the stability of the composite cross-arm.

[0009] In which, the composite crossarm also includes a first oblique-stayed connecting fitting for connecting the tower body and the first oblique-stayed insulator, and the first oblique-stayed connecting fitting includes: a first sub-connecting fitting, connected to the first oblique-stayed insulator; a second sub-connecting fitting, one end of which is adjustable and connected to the first sub-connecting fitting, and the other end is used to connect the tower body, thereby realizing the connection between the first oblique-stayed insulator and the tower body.

[0010] The provision of the first oblique-stayed connection fittings can make the structure of the composite crossarm variable and suitable for different application scenarios.

[0011] The first sub-connecting fitting is provided with a plurality of first mounting portions arranged in an arc shape, and the second sub-connecting fitting is selectively connected to one of the first mounting portions.

[0012] The arrangement of the first mounting portion enables the length of the first oblique-stayed connection fitting to be adjustable.

[0013] The composite crossarm further includes a second obliquely-stayed connection fitting, which is used to connect the tower body and the second obliquely-stayed insulator, wherein the length of the second obliquely-stayed connection fitting is fixed.

[0014] The second oblique-stayed connecting fitting can ensure a stable connection between the tower body and the second oblique-stayed insulator.

[0015] In which, the composite crossarm also includes a pillar connecting hardware for connecting the tower body and the pillar insulator, and the pillar connecting hardware includes: an end flange tube, which is sleeved on the end where the pillar insulator is connected to the tower body; an end flange plate, which covers the end of the end flange tube away from the pillar insulator; and a first mounting plate, whose end abuts against the disk surface of the end flange plate away from the end flange tube, for connecting the tower body.

[0016] The above-mentioned arrangement of the end flange cover and the end flange tube away from the end of the post insulator can prevent external moisture and the like from corroding the post insulator and extend the service life of the post insulator.

[0017] There are two first mounting plates, and both first mounting plates are arranged perpendicular to the end flange.

[0018] The number of the first mounting plates provided is two, which can ensure the stability of the connection between the post insulator and the tower body.

[0019] Wherein, the first mounting plate is provided with a second mounting portion for mounting the first mounting plate on the tower body.

[0020] The provision of the second mounting portion can ensure the connection strength between the first mounting plate and the tower body.

[0021] The second mounting portion is a through hole for a fastener to pass through to mount the first mounting plate on the tower body.

[0022] The second mounting portion is provided as a through hole, which can facilitate the installation of the first mounting plate on the tower body.

[0023] In order to solve the above technical problems, another technical solution adopted in the present application is: to provide a transmission tower, which includes a tower body and the above-mentioned composite cross arm connected to the tower body.

[0024] The beneficial effects of the present application are as follows: on the one hand, the composite cross-arm of the present application is provided with a post insulator and three oblique insulators connected together to form an end for hanging a transmission line, so that a stable triangular structure is formed between the composite cross-arm and the tower body, which can greatly improve the stability performance of the composite cross-arm; on the other hand, the angle range between the two first oblique insulators is set to 45° to 90°, which can provide favorable conditions for setting a first grading ring on the high-voltage end of the post insulator (the end away from the tower body) and the end fittings for setting a second grading ring on the high-voltage end (the end away from the tower body) of the two first oblique insulators; and the angle range between the second oblique insulator and the post insulator is set to 25° to 45°, which can provide favorable conditions for setting the first grading ring on the high-voltage end of the post insulator and the third grading ring on the high-voltage end (the end away from the tower body) of the second oblique insulator.

[0025] At the same time, in the pillar connection hardware connecting the tower body and the pillar insulator, an end flange cover is provided to cover the end flange tube away from the end of the pillar insulator, which can prevent the pillar insulator from being corroded by external water vapor, thereby extending the service life of the pillar insulator.

[0026] In addition, the second sub-connecting fitting in the first oblique-stayed connecting fitting is adjustable in position and connected to the first sub-connecting fitting, so that the length of the first oblique-stayed connecting fitting is adjustable, thereby making the structure of the composite crossarm variable and suitable for different application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without inventive efforts. Among them:

[0028] Figure 1 This is a structural diagram of an embodiment of a transmission tower of the present application;

[0029] Figure 2 yes Figure 1 Schematic diagram of the structure of the middle composite crossarm;

[0030] Figure 3 yes Figure 2 A magnified schematic diagram of point A in the middle;

[0031] Figure 4 yes Figure 2 Schematic diagram of the structure when the middle post insulator is connected to the end fittings;

[0032] Figure 5 yes Figure 4 Schematic cross-section of the structure along the CC section;

[0033] Figure 6 yes Figure 3 Schematic diagram of the structure of the middle end fitting;

[0034] Figure 7 yes Figure 3 Schematic diagram of the structure of the middle end fitting when viewed from another angle;

[0035] Figure 8 This is a structural diagram of the connection between the hanging plate and the wire clamp in an application scenario;

[0036] Figure 9 It is a structural diagram of the connecting plate;

[0037] Figure 10 yes Figure 7Schematic cross-section of the end fitting along the DD section;

[0038] Figure 11 yes Figure 10 The enlarged schematic diagram of point E in the middle;

[0039] Figure 12 yes Figure 10 An enlarged schematic diagram of point F in an application scenario;

[0040] Figure 13 yes Figure 10 An enlarged schematic diagram of point F in another application scenario;

[0041] Figure 14 yes Figure 2 A magnified schematic diagram of point B in the middle;

[0042] Figure 15 yes Figure 1 The enlarged schematic diagram of H in the middle;

[0043] Figure 16 yes Figure 2 The enlarged schematic diagram of point I in the middle;

[0044] Figure 17 is a schematic structural diagram of a composite crossarm in another embodiment;

[0045] Figure 18 yes Figure 17 Enlarged schematic diagram of point G in the middle;

[0046] Figure 19 yes Figure 18 Schematic diagram of the structure of the middle end fitting;

[0047] Figure 20 yes Figure 19 Schematic diagram of the explosion structure of the end fitting;

[0048] Figure 21 This is a structural diagram of another embodiment of the transmission tower of the present application;

[0049] Figure 22 yes Figure 21 Schematic diagram of some structures in ;

[0050] Figure 23 yes Figure 22 The enlarged schematic diagram of J in the middle;

[0051] Figure 24 yes Figure 21 Schematic diagram of some structures in ;

[0052] Figure 25 This is a structural diagram of an embodiment of the end fitting of the present application;

[0053] Figure 26 It is a structural schematic diagram of an embodiment of the composite cross arm of the present application. DETAILED DESCRIPTION

[0054] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0055] See Figures 1 to 3 The transmission tower 1000 includes a tower body 1100 and a composite cross arm 1200 connected to the tower body 1100 . The composite cross arm 1200 includes a post insulator 1210 and a diagonal insulator 1220 .

[0056] The tower body 1100 may be a transmission tower structure of common structures such as a lattice iron tower, a pole body or a composite pole tower. In this embodiment, the tower body 1100 is a lattice iron tower, wherein the accompanying drawings only show part of its structure.

[0057] One end of the post insulator 1210 and one end of the oblique-pull insulator 1220 are both connected to the tower body 1100, and the other ends are connected through the end fitting 1230. In this embodiment, the number of the post insulator 1210 is one, and the number of the oblique-pull insulators 1220 is at least two, for example, two, three, four or even more. At least two oblique-pull insulators 1220 are arranged at intervals around the post insulator 1210, and the axes of the two oblique-pull insulators 1220 are in the same plane as the axis of the post insulator 1210.

[0058] Specifically, at least two oblique insulators 1220 are connected to the support insulator 1210 through end fittings 1230. At the same time, the axes of the two oblique insulators 1220 and the axis of the support insulator 1210 are in the same plane, so that a stable triangular structure is formed between the composite crossarm 1200 and the tower body 1100, which can greatly improve the stability performance of the composite crossarm 1200.

[0059] Continue reading Figure 2In this embodiment, the number of the oblique insulators 1220 is three, wherein two oblique insulators 1220 whose axes are in the same plane as the axis of the post insulator 1210 are defined as first oblique insulators 1221, and the remaining oblique insulators 1220 are defined as second oblique insulators 1222, wherein the distances between the second oblique insulators 1222 and the two first oblique insulators 1221 are equal, and the angle between the two first oblique insulators 1221 ranges from 45° to 90°, for example, 45°, 60° or 90°, and the angle between the second oblique insulators 1222 and the post insulator 1210 ranges from 25° to 45°, for example, 25°, 30°, 35° or 45°.

[0060] Specifically, considering that a larger angle between the two first oblique-stayed insulators 1221 increases the mechanical strength that the composite crossarm 1200 can withstand, but also requires a corresponding increase in the length of the composite crossarm 1200 and the width of the tower body 1100, the angle between the two first oblique-stayed insulators 1221 is controlled within a range of 45° to 90°. This not only meets the load-bearing requirements of the composite crossarm 1200, but also optimizes the length of the composite crossarm 1200 and the width of the tower body 1100. Similarly, controlling the angle between the second oblique-stayed insulator 1222 and the post insulator 1210 within a range of 20° to 45° can also achieve the same goal.

[0061] Specifically, three sets of composite crossarms (not shown) are sequentially arranged on the tower body 1100 from top to bottom. The lengths of the three sets of composite crossarms are arranged in a decreasing, increasing, or other manner. In other words, the lengths of the post insulators are arranged in a decreasing, increasing, or other manner from bottom to top. Furthermore, the longer the post insulator 1210, the smaller the angle between the two first oblique insulators 1221. Assuming that the angle between the two first oblique insulators 1221 is α, the length of the post insulator 1210 is L, the horizontal width of the tower body 1100 perpendicular to the post insulators is D, the horizontal width of the tower body 1100 parallel to the post insulator 1210 is n, and the distance m between the connection point where the two first oblique insulators 1221 extend from the tower body 1100 and the tower body 1100 is obtained from trigonometric formulas:

[0062]

[0063] In one application scenario, taking a 220kV transmission tower 1000 as an example, the range of L is 2000mm to 4000mm, the range of D is 2000mm to 3000mm, m is generally set to 1000mm, and n is generally also set to 1000mm. From this, it can be calculated that the minimum value of α is 47.9° and the maximum value of α is 90°. Since the sizes of m and n can be adjusted, the angle range of the two first oblique insulators 1221 can be controlled within 45° to 90°.

[0064] Similarly, assuming that the angle between the second oblique insulator 1222 and the post insulator 1210 is β, and assuming that the distance between the connection point of the post insulator 1210 on the tower body 1100 and the connection point of the second oblique insulator 1222 on the tower body 1100 is H, the trigonometric formula can be obtained:

[0065]

[0066] Taking the 220kV transmission tower 1000 as an example, H is generally set to 2000mm. From this, it can be calculated that the minimum value of β is 26.6° and the maximum value of β is 45°. Since the size of H can be adjusted again, the angle between the post insulator 1210 and the adjacent diagonal insulator 1220 can be controlled in the range of 25° to 45°.

[0067] At the same time, setting the angle range between the two first oblique-pull insulators 1221 to 45°~90° can provide favorable conditions for setting the first equalizing ring (not shown) and the end hardware 1230 on the high-voltage end of the support insulator 1210 (the end away from the tower body 1100), and setting the second equalizing ring 12201 on the high-voltage end (the end away from the tower body 1100) of the two first oblique-pull insulators 1221. Specifically, it can ensure that the first equalizing ring on the support insulator 1210 and the second equalizing ring 12201 on the first oblique-pull insulator 1221 do not interfere with each other, and the first equalizing ring on the support insulator 1210, the second equalizing ring 12201 on the first oblique-pull insulator 1221 and the end hardware 1230 do not interfere with each other.

[0068] And setting the angle range between the second oblique insulator 1222 and the support insulator 1210 to 25°~45° can provide favorable conditions for setting the first equalizing ring on the high-voltage end of the support insulator 1210 and setting the third equalizing ring 12202 on the high-voltage end of the second oblique insulator 1222 (the end away from the tower body 1100). Specifically, it can ensure that the first equalizing ring set on the support insulator 1210 and the third equalizing ring 12202 set on the second oblique insulator 1222 do not interfere with each other during misaligned installation.

[0069] Continue reading Figure 1 and Figure 2In this embodiment, the post insulator 1210 and the two first oblique insulators 1221 are installed at the same height, and the second oblique insulator 1222 is located above the post insulator 1210. It should be noted that in other embodiments, when there is more than one second oblique insulator 1222, second oblique insulators 1222 can be installed above and below the post insulator 1210, so as to balance the tension of the transmission line in all directions.

[0070] The support insulator 1210 may be arranged horizontally ( Figure 1 The horizontal setting is used for illustration purposes only), but an inclined setting is also possible.

[0071] At the same time, in order to ensure that the composite crossarm 1200 is uniformly stressed, the angles between the two first oblique insulators 1221 and the support insulator 1210 are equal, that is, the axis of the second oblique insulator 1222 and the axis of the support insulator 1210 are in the same vertical plane.

[0072] Of course, in other embodiments, the angles between the two first oblique insulators 1221 and the post insulator 1210 may also be unequal, which is not limited here.

[0073] See Figure 4 and Figure 5 In this embodiment, the post insulator 1210 includes an insulator 1211 and an shed 1212 wrapped around the outer periphery of the insulator 1211 .

[0074] Specifically, the insulator 1211 can be a solid insulating core or a hollow insulating tube. When the insulator 1211 is a solid insulating core, it can be a solid core rod formed by glass fiber or aramid fiber impregnated with epoxy resin and wound or pultruded or pultruded and wound. When the insulator 1211 is a hollow insulating tube, it can be a hollow pultruded tube formed by glass fiber or aramid fiber impregnated with epoxy resin and pultruded and wound, or a glass fiber reinforced plastic tube formed by glass fiber impregnated with epoxy resin and wound and cured or pultruded, or an aramid tube formed by aramid fiber impregnated with epoxy resin and wound and cured. There is no limitation here.

[0075] The insulator 1211 can be cylindrical (illustrated in the figure as a cylindrical shape), conical, or other shapes (such as a drum shape), without limitation. When the insulator 1211 is conical, its conical end (the end with the smaller diameter) is connected to the end fitting 1230, and the other end is connected to the tower body 1100.

[0076] In one application scenario, when the insulator 1211 is a hollow insulating tube, insulating gas is sealed in the insulator 1211, and the absolute pressure value of the insulating gas ranges from 0.1 to 0.15 MPa, for example, 0.1 MPa, 0.12 MPa or 0.15 MPa.

[0077] Specifically, the gas sealed in the hollow insulating tube can be high-purity nitrogen, air, sulfur hexafluoride or other gases that have been dried, and there is no limitation here.

[0078] At the same time, setting the absolute pressure value range of the insulating gas to 0.1~0.15Mpa can prevent the insulating gas from leaking from the hollow insulating tube, eliminating the need for daily maintenance and monitoring of the post insulator 1210, and can also meet the different pressure usage requirements between different regions and altitudes, thereby ensuring that the gas inside the hollow insulating tube is in a non-negative pressure state when used in different regions. At the same time, it can also enable the hollow insulating tube to have a larger micro-water control margin, effectively reducing the difficulty of micro-water control.

[0079] In other application scenarios, when the insulator 1211 is a hollow insulating tube, its interior may also be sealed with an inert gas or a solid material such as polyurethane, liquid silicone rubber, etc., which is not limited here.

[0080] At the same time, the umbrella skirt 1212 can be made of high-temperature vulcanized silicone, liquid silicone rubber or room temperature vulcanized silicone rubber and other materials, which are not limited here.

[0081] In one application scenario, the shed 1212 includes a plurality of spaced-apart, identical shed bodies, i.e., all shed bodies are identical and radially symmetrical relative to the insulator 1211, i.e., the two opposing surfaces of the shed bodies are inclined in opposite directions and at the same angle. Specifically, the radial symmetry of the shed bodies relative to the insulator 1211 allows rainwater to flow down the shed 1212, compared to the prior art practice of having two opposing surfaces of the shed body inclined in the same direction. (If the two opposing surfaces of the shed body were inclined in the same direction, rainwater would easily accumulate within the angle between the post insulator 1210 and the shed body.) This prevents the formation of a water film on the surface of the shed 1212, facilitating self-cleaning of the shed 1212. Furthermore, the opposing sides of the shed body have identical mechanical properties, making the post insulator 1210 more resistant to contamination, rain flashover, and ice flashover, while also being more economical.

[0082] In one application scenario, to prevent turbulence and contamination between adjacent shrouds, which could result in bridging, the spacing between adjacent shrouds is greater than 40 mm and no more than 60 mm, for example, 45 mm, 50 mm, or 60 mm. Of course, the distance between adjacent shrouds should be minimized to increase the density of the shrouds, making it difficult for birds to stand on the sheath, thereby preventing bird damage. While maintaining the minimum creepage distance, the height of the shroud protruding from the insulator 1211 is set to no more than 80 mm, typically ranging from 50 mm to 80 mm, for example, 50 mm, 60 mm, or 70 mm.

[0083] It should be noted that, in other embodiments, the shed 1212 may also have other structures. For example, two adjacent umbrella bodies may be of different sizes, or two oppositely disposed surfaces of the umbrella bodies may be inclined in the same direction. In short, the present application does not impose any limitation on the specific structure of the shed 1212.

[0084] Combine Figure 3 、 Figure 6 and Figure 7 In this embodiment, the end fitting 1230 includes a first flange tube 1231 , a sealing plate 1232 and a wire hanging plate 1233 .

[0085] The first flange tube 1231 is configured as a hollow structure along the axial direction, and is used to be sleeved on the end of the support insulator 1210, specifically used to be sleeved on the end of the insulator 1211 in the support insulator 1210; the sealing plate 1232 covers one end of the first flange tube 1231; the line hanging plate 1233 is arranged on the side of the sealing plate 1232 away from the first flange tube 1231 and is connected to the sealing plate 1232, and is used for hanging transmission lines.

[0086] Specifically, when the hanging plate 1233 used to hang the transmission line is damaged and the hanging plate 1233 is replaced, since the sealing plate 1232 covers one end of the first flange tube 1231, it can ensure that the support insulator 1210 inside the first flange tube 1231 is not corroded by external water vapor, etc., thereby ensuring the service life of the support insulator 1210.

[0087] Continue reading Figure 6 and Figure 7 One end of the hanging plate 1233 presses against the plate surface of the sealing plate 1232 away from the first flange cylinder 1231 , and a reinforcement member 1234 is connected between the side of the hanging plate 1233 and the sealing plate 1232 .

[0088] Specifically, the provision of the reinforcement member 1234 serves to strengthen the connection between the wire hanging plate 1233 and the sealing plate 1232, thereby preventing the wire hanging plate 1233 and the sealing plate 1232 from breaking due to insufficient connection strength.

[0089] In an application scenario, such as Figure 6 As shown, the reinforcement member 1234 is a plate member, and the sealing plate 1232, the wire hanging plate 1233 and the reinforcement member 1234 are vertically arranged in pairs.

[0090] In order to prevent the end fitting 1230 from being corroded by water vapor, the surface of the end fitting 1230 is hot-dip galvanized. At the same time, the internal material of the end fitting 1230 can be cast aluminum, cast iron or alloy steel, etc., which is not limited here.

[0091] At the same time, the various parts of the end fitting 1230 can be connected together by welding or other methods.

[0092] Continue reading Figure 6 The hanging plate 1233 is provided with a first hanging portion 12331 for hanging the transmission line. Specifically, the first hanging portion 12331 is used to install a wire clamp connected to the transmission line, thereby hanging the transmission line. The number of the first hanging portions 12331 can be one, two, four or even more, and is not limited here. When there are multiple first hanging portions 12331, the multiple first hanging portions 12331 can respectively install multiple wire clamps connected to the same transmission line, so that when one of the wire clamps is damaged, it can still ensure the safe hanging of the transmission line.

[0093] In an application scenario, such as Figure 6 As shown, the first wire hanging portion 12331 is a wire hanging through hole, and the side of the wire hanging plate 1233 not provided with the first wire hanging portion 12331 is connected to the reinforcement 1234. Specifically, this arrangement can ensure that the reinforcement 1234 does not affect the installation of the wire clip on the wire hanging plate 1233.

[0094] At the same time, in this application scenario, the number of the first hanging wire portion 12331 is one, and the hanging wire plate 1233 is also provided with a construction hole 12332 for construction hoisting. Of course, in other application scenarios, the number of the first hanging wire portion 12331 can be more than one.

[0095] In an application scenario, such as Figure 8 As shown, when the hanging plate 1233 is used to hang a single wire, the hanging plate 1233 is connected to the U-shaped hanging ring 123301. Specifically, the two ends of the U-shaped hanging ring 123301 are connected to the hanging plate 1233, and the U-shaped hanging ring 123301 is connected to the wire clamp 123302 for hanging the wire.

[0096] When hanging plate 1233 is used to hang two wires, it is also connected to U-shaped hanging ring 123301. However, unlike a single wire, U-shaped hanging ring 123301 is also connected to an intermediate connecting plate, which in turn is connected to two wire clamps 123302, each used to hang a wire. In one application scenario, the cross-section of the intermediate connecting plate is roughly an isosceles triangle. The two wire clamps 123302 are connected to the two bottom corners of the intermediate connecting plate, while the U-shaped hanging ring 123301 is connected to the top corner of the intermediate connecting plate.

[0097] In one application scenario, see Figure 9 The composite crossarm 1200 further includes a connecting plate 1235, which is used to connect to the wire hanging plate 1233. The connecting plate 1235 is provided with second wire hanging portions 12351 for hanging power lines. The number of second wire hanging portions 12351 is greater than the number of first wire hanging portions 12331. Specifically, due to area limitations, the wire hanging plate 1233 only allows a limited number of first wire hanging portions 12331, which cannot meet the wire hanging needs in some application scenarios. The provision of the connecting plate 1235 can expand the number of first wire hanging portions 12331.

[0098] In one application scenario, in order to adapt to the needs of different application scenarios, the connecting plate 1235 is connected to the hanging plate 1233 through a length-adjustable connecting hardware (not shown in the figure), so that the relative distance between the connecting plate 1235 and the hanging plate 1233 can be adjusted according to needs in different application scenarios.

[0099] In one application scenario, the second wire hanging portion 12351 has the same structure as the first wire hanging portion 12331, for example, both are wire hanging through holes. Of course, the structures of the second wire hanging portion 12351 and the first wire hanging portion 12331 may also be different. For example, the first wire hanging portion 12331 is a wire hanging through hole, and the second wire hanging portion 12351 is a wire hanging slot. In short, this application does not limit the specific structures of the first wire hanging portion 12331 and the second wire hanging portion 12351.

[0100] Combine Figure 3 、 Figure 6 and Figure 7 In this embodiment, the end fitting 1230 further includes a connecting plate 1236 , which is disposed on the periphery of the first flange tube 1231 and connected to the first flange tube 1231 for connecting the oblique-pull insulator 1220 .

[0101] Specifically, the connecting plate 1236 can be disposed on the periphery of the first flange cylinder 1231 by welding or the like.

[0102] Among them, the use of a connecting plate 1236 arranged on the periphery of the first flange tube 1231 to connect the oblique insulator 1220 can avoid destroying the first flange tube 1231 (for example, opening a hole on the first flange tube 1231) in order to directly use the first flange tube 1231 to connect the oblique insulator 1220, thereby ensuring the strength of the first flange tube 1231.

[0103] In this embodiment, the number of connecting plates 1236 can be one or at least two. When there is one connecting plate 1236, in order to connect all the oblique insulators 1220, the connecting plate 1236 can extend around the first flange cylinder 1231 to form a semi-enclosed structure or a fully enclosed structure. When there are at least two connecting plates 1236, different connecting plates 1236 can be connected to different oblique insulators 1220. In other words, the number of connecting plates 1236 can be equal to the number of oblique insulators 1220, and at least two connecting plates 1236 are arranged at intervals along the circumference of the first flange cylinder 1231 (such as Figure 3 and Figure 6 shown).

[0104] Combine Figure 7 and Figure 10 In this embodiment, the inner wall of the first flange cylinder 1231 is provided with a plurality of glue grooves 12311 arranged at intervals along the axial direction and a circulation groove 12312 connecting the plurality of glue grooves 12311, wherein the glue grooves 12311 and the circulation grooves 12312 are filled with adhesive to fix the first flange cylinder 1231 and the insulator 1211.

[0105] Specifically, during the production process, a horizontal gluing process or a vertical gluing process is used to connect the end fitting 1230 and the support insulator 1210 together: during the production process, the adhesive is first injected between the first flange tube 1231 and the insulator 1211 through the glue injection hole, and then after a certain period of high-temperature curing, the end fitting 1230 and the support insulator 1210 can be fixedly connected together.

[0106] The setting of the circulation groove 12312 can allow the adhesive injected between the first flange cylinder 1231 and the insulator 1211 to flow between adjacent glue grooves 12311, thereby increasing the injection rate, reducing the risk of bubble retention, and making the connection between the end hardware 1230 and the insulator 1211 more firmly, thereby improving the torsional resistance of the composite crossarm 1200 without replacing the adhesive with better bonding performance.

[0107] The number of the circulation grooves 12312 can be one or more (for example, two, four, six, or even more). When there are multiple circulation grooves 12312, the plurality of circulation grooves 12312 are spaced apart along the circumference of the first flange cylinder 1231. One circulation groove 12312 can connect only two adjacent adhesive bonding grooves 12311, or can connect three, four, or even all adjacent adhesive bonding grooves 12311, without limitation.

[0108] The bottom surface of the circulation groove 12312 is a flat surface or a curved surface. Specifically, when the radial depth and width of the circulation groove 12312 relative to the end fitting 1230 are constant, the circulation groove 12312 with a flat bottom surface is more complex and costly to manufacture than the circulation groove 12312 with a curved bottom surface, but has higher torsional strength. This is because the contact area between the adhesive in the flat groove and the inner wall of the first flange cylinder 1231 is larger. In other words, the circulation groove 12312 with a curved bottom surface is easier to manufacture and less costly to manufacture than the circulation groove 12312 with a flat bottom surface, but has slightly lower torsional strength.

[0109] Among them, Figure 11 As shown, the widths of the multiple glue grooves 12311 are equal, and the width of the glue grooves 12311 is smaller than the width of the interval between two adjacent glue grooves 12311. Specifically, by setting the width of the glue groove 12311 to be smaller than the width of the interval between two adjacent glue grooves 12311, the width of the glue matching groove on the insulator 1211 (not shown, the glue matching groove on the insulator 1211 has the same specifications as the glue groove 12311 on the first flange cylinder 1231 and is arranged opposite to each other) is also smaller than the width of the interval between two adjacent glue matching grooves. Compared with the case where the width of the glue matching groove on the insulator 1211 is greater than or equal to the width of the interval between two adjacent glue matching grooves, this setting can ensure the shear resistance of the post insulator 1210.

[0110] Specifically, the width of the adhesive groove 12311 does not exceed 12 mm. Specifically, the insulator 1211 itself has a low axial shear strength. When it is damaged, the first part to be damaged is the part that is inserted into the first flange cylinder 1231 and is not bonded with adhesive, that is, the part of the insulator 1211 adjacent to the two adhesive matching grooves. When the width of the first flange tube 1231 is constant, if the width of the glue groove 12311 is reduced, the distance between the two adjacent glue grooves 12311 will increase, that is, the distance between the two adjacent glue matching grooves on the insulator 1211 will increase, and its strength against shear failure will increase, ultimately enhancing the shear resistance of the support insulator 1210 of the same specification. However, if the width of the glue groove 12311 is too small, it will lead to an increase in processing time and processing costs. Therefore, the width of the glue groove 12311 is set to not more than 12 mm, for example, 12 mm, 10 mm or 8 mm, etc., which can not only ensure the strength of the composite crossarm 1200, but also ensure that the processing time and processing costs are within a reasonable range.

[0111] In order to facilitate processing, the bottom surface of the glue binding groove 12311 is a curved surface.

[0112] The ratio of the length of the contact portion between the inner wall of the first flange cylinder 1231 and the insulator 1211 to the outer diameter of the insulator 1211 (i.e., the bonding ratio) ranges from 0.8 to 1.2, for example, 0.8, 1.0, or 1.2. Specifically, as the bonding ratio decreases, the strength of the composite crossarm 1200 decreases significantly. For example, compared to a bonding ratio of 0.8, when the bonding ratio decreases to 0.75, the strength of the composite crossarm 1200 decreases by 20%. Compared to a bonding ratio of 1.2, when the bonding ratio increases to 1.4, although the strength of the composite crossarm 1200 increases slightly, the cost increases significantly. Therefore, setting the bonding ratio range to 0.8 to 1.2 can make the composite crossarm 1200 have the advantages of low cost and high strength.

[0113] It should also be noted that, in other embodiments, the binding groove 12311 and the circulation groove 12312 can also be of other sizes, which are not limited here.

[0114] In one application scenario, combined with Figure 5 、 Figure 7 、 Figure 10 and Figure 12The surface of the sealing plate 1232 facing the insulator 1211 is provided with a first sealing groove 12321, which is aligned with the end face of the insulator 1211. A first sealing member (not shown) is disposed within the first sealing groove 12321. Specifically, the first sealing member is disposed within the first sealing groove 12321 to prevent external moisture or adhesive from entering the insulator 1211, thereby preventing gas leakage within the insulator 1211, and to prevent external moisture or adhesive from entering the sealing plate 1232, thereby affecting the seal between the insulator 1211 and the end fitting 1230.

[0115] Continue reading Figure 10 and Figure 12 The inner wall of the first flange cylinder 1231 is further defined by a second sealing groove 12313 adjacent to the sealing plate 1232. The second sealing groove 12313 is spaced apart from the plurality of adhesive bonding grooves 12311 in a direction away from the sealing plate 1232. A second sealing member (not shown) is positioned within the second sealing groove 12313. Specifically, the second sealing member functions differently from the first sealing member. The second sealing member prevents adhesive from entering the first sealing groove 12321 during the adhesive bonding process, corroding the first sealing member and causing it to fail.

[0116] The width of the first sealing groove 12321 and / or the second sealing groove 12313 remains unchanged in the direction close to the insulator 1211 (eg Figure 12 as shown) or gradually become smaller (as shown Figure 13 As shown). Specifically, the first sealing groove 12321 whose width remains unchanged in the direction close to the insulator 1211 is easy to process, but the first sealing member therein is prone to sliding or even falling off. At this time, in order to avoid relative sliding of the first sealing member in the first sealing groove 12321, the first sealing member is fixed in the first sealing groove 12321 by resin or silicone bonding; and compared with the first sealing groove 12321 whose width remains unchanged in the direction close to the insulator 1211, the first sealing groove 12321 whose width gradually decreases in the direction close to the insulator 1211 has a more complicated processing process, but it can ensure that the first sealing member will not fall off easily. Among them, the width of the first sealing groove 12321 and / or the second sealing groove 12313 can be linearly reduced in the direction close to the insulator 1211 (as shown). Figure 13 It can also be reduced in a curve, which is not limited here.

[0117] Combine Figure 2 and Figure 14 In this embodiment, the composite crossarm 1200 further includes a diagonal connection fitting 1240 for connecting the tower body 1100 and the diagonal insulator 1220 .

[0118] In this embodiment, the length of the oblique connection fitting 1240 connecting the tower body 1100 and the first oblique insulator 1221 is adjustable, while the length of the oblique connection fitting 1240 connecting the tower body 1100 and the second oblique insulator 1222 is fixed. For the sake of convenience, the oblique connection fitting 1240 connecting the tower body 1100 and the first oblique insulator 1221 is defined as the first oblique connection fitting 1241, and the oblique connection fitting 1240 connecting the tower body 1100 and the second oblique insulator 1222 is defined as the second oblique connection fitting 1242.

[0119] The first oblique-stayed connection fitting 1241 includes a first sub-connection fitting 12411 and a second sub-connection fitting 12412 .

[0120] The first sub-connecting fitting 12411 is connected to the first oblique-stayed insulator 1221. The second sub-connecting fitting 12412 has one end that is adjustably connected to the first sub-connecting fitting 12411 and the other end that is connected to the tower body 1100, thereby connecting the first oblique-stayed insulator 1221 to the tower body 1100. Specifically, the provision of one end of the second sub-connecting fitting 12412 that is adjustably connected to the first sub-connecting fitting 12411 allows for a more versatile structure of the composite crossarm 1200, adapting it to different application scenarios.

[0121] In an application scenario, such as Figure 14 As shown, the first sub-connecting fitting 12411 is provided with a plurality of first mounting portions 124111 arranged in an arc shape, and the second sub-connecting fitting 12412 is selectively connected to a first mounting portion 124111. Specifically, the plurality of first mounting portions 124111 are arranged in an arc shape, so that the distance and relative angle between the tower body 1100 and the first inclined insulator 1221 can be adjusted.

[0122] In an application scenario, such as Figure 14 As shown, the first sub-connecting hardware 12411 is a fan-shaped flat foot hardware, and the second sub-connecting hardware 12412 is a slot hardware.

[0123] In other embodiments, the plurality of first mounting portions 124111 may also be arranged in a straight line along the extension direction of the first oblique insulator 1221 , which is not limited here.

[0124] In other embodiments, the second sub-connecting fitting 12412 may be connected to the first oblique insulator 1221 , and the first sub-connecting fitting 12411 may be connected to the tower body 1100 , which is not limited here.

[0125] At the same time, in other embodiments, the length of the oblique connecting hardware 1240 connecting the tower body 1100 and the first oblique insulator 1221 and the length of the oblique connecting hardware 1240 connecting the tower body 1100 and the second oblique insulator 1222 are both adjustable, or the length is not adjustable. That is to say, the tower body 1100 and the first oblique insulator 1221 can be connected by the first oblique connecting hardware 1241 or the second oblique connecting hardware 1242; similarly, the tower body 1100 and the second oblique connecting hardware 1241 or the second oblique connecting hardware 1242 are connected, and there is no limitation here.

[0126] Combine Figure 1 、 Figure 2 、 Figure 15 and Figure 16 In this embodiment, the post insulator 1210 further includes a post connection fitting 1250 for connecting the tower body 1100 and the post insulator 1210 . The post connection fitting 1250 includes an end flange tube 1251 , an end flange plate 1252 and a first mounting plate 1253 .

[0127] The end flange tube 1251 is axially configured as a hollow structure and is sleeved on the end portion where the post insulator 1210 is connected to the tower body 1100, specifically, on one end of the insulator 1211; the end flange plate 1252 covers the end portion of the end flange tube 1251 away from the insulator 1211, and is used to prevent the end portion of the insulator 1211 from being corroded by external water vapor, etc., thereby protecting the insulator 1211; the end portion of the first mounting plate 1253 abuts against the disk surface of the end flange plate 1252 away from the end flange tube 1251, and at the same time, a second mounting portion 12531 is provided on the first mounting plate 1253, which is used to mount the first mounting plate 1253 on the tower body 1100 to achieve the connection between the post insulator 1210 and the tower body 1100. In one application scenario, the second mounting portion 12531 is a through hole. At this time, the first mounting plate 1253 can be mounted on the tower body 1100 by passing a fastener such as a bolt through the through hole.

[0128] In an application scenario, such as Figure 16 As shown, the first mounting plate 1253 is a straight plate, and in order to ensure the connection between the tower body 1100 and the support insulator 1210 is firm, the number of the first mounting plates 1253 is two, and the two first mounting plates 1253 are arranged parallel to each other. Of course, in other application scenarios, the number of the first mounting plates 1253 can also be one, three, etc. Figure 16 As shown, the two first mounting plates 1253 are both vertically arranged on the end flange 1252. Of course, in other application scenarios, the first mounting plates 1253 may not be vertically arranged on the end flange 1252, which is not limited here.

[0129] Continue to combine Figure 1 and Figure 15 In order to enable the pillar connecting hardware 1250 to adapt to different application scenarios, the pillar connecting hardware 1250 also includes a second mounting plate 1254, which is detachably connected to the first mounting plate 1253 and is used to connect the first mounting plate 1253 to the tower body 1100, so that the first mounting plate 1253 can be set to be directly connected to the tower body 1100 according to different needs, or the first mounting plate 1253 can be set to be connected to the tower body 1100 through the second mounting plate 1254.

[0130] In an application scenario, such as Figure 15 As shown, in order to increase the contact area between the second mounting plate 1254 and the tower body 1100 and ensure the connection strength between the second mounting plate 1254 and the tower body 1100, the second mounting plate 1254 is a bent plate, one end of which is in contact with the beam on the tower body 1100 and the other end is in contact with the first mounting plate 1253.

[0131] In one application scenario, combined with Figure 15 and Figure 16 The number of the first mounting plates 1253 is equal to the number of the second mounting plates 1254 , and one second mounting plate 1254 is mounted on one first mounting plate 1253 .

[0132] See Figures 17 to 19 Different from the above-mentioned embodiment, in the composite crossarm 2200 of this embodiment, the end fitting 2230 further includes a second flange tube 2237, which is axially arranged as a hollow structure, coaxially arranged with the first flange tube 2231 and connected to the other end of the first flange tube 2231 away from the sealing plate 2232, wherein the outer peripheral surface of the second flange tube 2237 is smooth.

[0133] Specifically, since the outer circumference of the second flange tube 2237 is smooth, the second flange tube 2237 with a smooth outer circumference can be fixed to the periphery of the support insulator 2210 by a crimping process. Since the first flange tube 2231 is connected to the second flange tube 2237, when the second flange tube 2237 is fixed to the periphery of the support insulator 2210 by a crimping process, the first flange tube 2231 can also be fixed to the periphery of the support insulator 2210, that is, the end hardware 2230 can be fixed to the periphery of the support insulator 2210 by a crimping process.

[0134] The aforementioned embodiment adopts a gluing process to install the end fitting 1230 on the post insulator 1210. Compared with the crimping process, the gluing process has a long process time, low molding efficiency, and requires a large number of molding tools. In addition, the post insulator 1210 after molding has poor ability to withstand bending loads and torsional loads. That is to say, this embodiment adopts a crimping process to install the end fitting 2230 on the post insulator 2210, which can improve production efficiency, reduce production costs (reduce the use of molding tools), and ensure that the post insulator 2210 can withstand bending loads and torsional loads.

[0135] In this embodiment, the first flange tube 2231 is detachably connected to the second flange tube 2237. This arrangement allows the end fitting 2230 to be separated during transportation, which facilitates transportation. In addition, if the first flange tube 2231 or the second flange tube 2237 is damaged, it can be replaced in a timely manner to avoid scrapping the entire end fitting 2230.

[0136] At the same time, during transportation, only the second flange tube 2237 can be fixed on the post insulator 2210, and then after arriving at the destination, the first flange tube 2311 can be connected to the second flange tube 2237, thereby reducing the packaging cost of the post insulator 2210 during transportation.

[0137] See Figure 19 and Figure 20 The end fitting 2230 also includes a first flange 2238 and a second flange 2239.

[0138] The first flange 2238 is arranged at the other end of the first flange cylinder 2231 away from the sealing plate 2232 and is sleeved on the periphery of the first flange cylinder 2231; the second flange 2239 is arranged at one end of the second flange cylinder 2237 and is sleeved on the periphery of the second flange cylinder 2237, wherein the first flange 2238 and the second flange 2239 are detachably connected to realize the detachable connection between the first flange cylinder 2231 and the second flange cylinder 2237. Specifically, this arrangement can indirectly increase the contact area between the first flange cylinder 2231 and the second flange cylinder 2237, thereby increasing the connection strength between the first flange cylinder 2231 and the second flange cylinder 2237.

[0139] See Figure 20 Matching locking holes 22381 are respectively provided on the first flange 2238 and the second flange 2239, so that the first flange 2238 and the second flange 2239 can be connected together by using locking members (such as bolts) passing through the locking holes 22381.

[0140] In other embodiments, a matching snap-fit structure may also be provided on the first flange 2238 and the second flange 2239, so that the first flange 2238 and the second flange 2239 can be detachably connected by snapping. In short, this application does not impose any restrictions on how the first flange 2238 and the second flange 2239 can be detachably connected.

[0141] Among them, in other embodiments, the end fitting 2230 may include, in addition to the first flange tube 2231 and the second flange tube 2237, a third flange tube, a fourth flange tube or even more flange tubes, that is, at this time the number of flange tubes in the end fitting 2230 is more than two, and at this time the multiple flange tubes in the end fitting 2230 are coaxially arranged and connected in sequence, for example, the fourth flange tube, the third flange tube, the second flange tube 2237 and the first flange tube 2231 are connected in sequence, or the second flange tube 2237, the fourth flange tube, the third flange tube and the first flange tube 2231 are connected in sequence, and at the same time, in addition to the smooth outer circumference of the second flange tube 2237, the third flange tube, the fourth flange tube or other flange tubes can also be flange tubes with a smooth outer circumference, or the oblique insulator 2220 can be connected to the third flange tube, the fourth flange tube or other flange tubes in addition to being connected to the first flange tube 2231.

[0142] At the same time, when the end fitting 2230 also includes a third flange tube, a fourth flange tube or even more flange tubes, the connection method between the two adjacent flange tubes can be the same as the connection method between the first flange tube 2231 and the second flange tube 2237. For example, the two adjacent flange tubes are detachably connected, and the two adjacent flange tubes are detachably connected by flange plates sleeved on their respective ends, and matching locking holes 22381 are respectively provided on the two detachably connected flange plates to connect the two adjacent flange plates together by using a locking piece passing through the locking hole 22381.

[0143] See Figure 21 and Figure 22 , Figure 21 This is a structural diagram of another embodiment of the transmission tower of the present application. Figure 22 yes Figure 21 , which is different from the above embodiment, the tower body 3100 in this embodiment includes a tower pole 3110, and the ends of the support insulator 3210 and the inclined insulator 3220 in the composite cross arm 3200 are both connected to the tower pole 3110.

[0144] The tower pole 3110 may be a steel pipe pole, or a solid pole or a hollow pole made of other materials such as composite materials, iron, alloy, etc., and is not limited here.

[0145] At the same time, in order to install the composite cross arm 3200 on the tower 3110, combined with Figure 23 The transmission tower 3000 further includes a cross-arm connection fitting 3300. The cross-arm connection fitting 3300 connects the end of the post insulator 3210 not connected to the diagonal insulator 3220 and the end of the diagonal insulator 3220 not connected to the post insulator 3210 to the tower pole 3110, thereby enabling the composite cross-arm 3200 to be installed on the tower body 3100, specifically on the tower pole 3110.

[0146] The cross arm connection fitting 3300 includes a connecting rod 3310 , a tower flange tube 3320 and a tower flange plate 3330 .

[0147] In this embodiment, the number of oblique insulators 3220 is three, wherein two oblique insulators 3220 whose axes are in the same plane as the axis of the post insulator 3210 are defined as first oblique insulators 3221, and the remaining oblique insulators 3220 are defined as second oblique insulators 3222, wherein the distances from the second oblique insulators 3222 to the two first oblique insulators 3221 are equal.

[0148] Also, for the sake of convenience, the oblique connection fitting 3240 connecting the tower pole 3110 and the first oblique insulator 3221 is defined as the first oblique connection fitting 3241, and the oblique connection fitting 3240 connecting the tower pole 3110 and the second oblique insulator 3222 is defined as the second oblique connection fitting 3242.

[0149] There are two connecting rods 3310, and the two connecting rods 3310 respectively connect the two first oblique insulators 3221 to the tower pole 3110, that is, the first oblique connecting hardware 3241 connected to the end of the first oblique insulator 3221 is connected to the connecting rod 3310; one end of the tower body flange tube 3320 is connected to the tower pole 3110; the tower body flange plate 3330 covers the end of the tower body flange tube 3320 away from the tower pole 3110 and is connected to the support insulator 3210.

[0150] In an application scenario, such as Figure 22 and Figure 23 As shown, the two connecting rods 3310 are both arranged perpendicular to the tower rod 3110, and the heights of the two connecting rods 3310 relative to the tower rod 3110 are the same.

[0151] Of course, in other application scenarios, the two connecting rods 3310 may not be set perpendicular to the tower pole 3110, or the heights of the two connecting rods 3310 relative to the tower pole 3110 may be different. The specific setting method can be determined by the structure of the composite cross arm 3200 and is not limited here.

[0152] In another application scenario, the two connecting rods 3310 and the tower flange tube 3320 are fixed to the tower pole 3110 by welding. Of course, they can also be fixed in other ways, which is not limited here.

[0153] At the same time, different from the above-mentioned embodiment, Figure 22 and Figure 23 As shown, the tower flange 3330 in the cross-arm connecting hardware 3300 is docked with the end flange 3252 in the pillar connecting hardware 3250 to achieve the installation of the pillar insulator 3210.

[0154] Continue reading Figure 22 and Figure 23 The cross arm connection fitting 3300 also includes a reinforcement ring 3340 and a reinforcement rib 3350 .

[0155] The reinforcement ring 3340 is sleeved on the periphery of the tower pole 3110, and the two ends of the reinforcement rib 3350 are respectively connected to the reinforcement ring 3340 and the tower body flange tube 3320, and the side wall of the reinforcement rib 3350 is in contact with the tower pole 3110, thereby further indirectly increasing the contact area between the tower body flange tube 3320 and the tower pole 3110, and ensuring the connection strength between the tower body flange tube 3320 and the tower pole 3110.

[0156] The number of the reinforcement rings 3340 can be one or two. When the number of the reinforcement rings 3340 is two, as shown in FIG. Figure 23 As shown, two reinforcement rings 3340 are arranged on two opposite sides of the tower flange tube 3320, and for the tower flange tube 3320, it is connected to the two reinforcement rings 3340 respectively through two reinforcement ribs 3350.

[0157] Continue reading Figure 22 and Figure 23 The cross-arm connecting fitting 3300 further includes a reinforcing plate 3360, the two ends of which are respectively connected to the connecting rod 3310 and the tower flange tube 3320, and a side wall of the reinforcing plate 3360 is in contact with the tower pole 3110, thereby indirectly increasing the contact area between the connecting rod 3310, the tower flange tube 3320 and the tower pole 3110, and ensuring the connection strength between the connecting rod 3310, the tower flange tube 3320 and the tower pole 3110.

[0158] At the same time, in order to further increase the connection strength between the connecting rod 3310 and the tower body flange tube 3320, the connecting rod 3310 can also be connected to the reinforcement ring 3340 through the reinforcement rib 3350. At this time, the reinforcement rib 3350 connecting the reinforcement ring 3340 and the connecting rod 3310 and the reinforcement rib 3350 connecting the reinforcement ring 3340 and the tower body flange tube 3320 are set in the same way. Please refer to the above for details and will not be repeated here.

[0159] It should be noted that the reinforcement ring 3360 and the reinforcement ring 3340 may exist at the same time, or only one of them may exist, or neither of them may exist (for details, please refer to Figure 21 and Figure 24 ).

[0160] At the same time, the reinforcement ring 3340, the reinforcement rib 3350 and the reinforcement plate 3360 can be fixedly connected to the two connecting rods 3310 and the tower flange tube 3320 by welding or other means to form a cross-arm connection hardware 3300. Of course, the cross-arm connection hardware 3300 can also be formed in one piece, which is not limited here.

[0161] Continue reading Figure 22 The cross arm connection fitting 3300 also includes a connection ear 3370, which is fixed to the tower pole 3110. The fixing method of the connection ear 3370 and the tower pole 3110 is consistent with the fixing method of the connecting rod 3310, the tower body flange tube 3320 and the tower pole 3110, and will not be repeated here.

[0162] The oblique connection fitting 3240 (second oblique connection fitting 3242) connected to the end of the second oblique insulator 3222 is connected to the connecting lug 3370. Specifically, the second oblique connection fitting 3242 and the connecting lug 3370 are connected via a U-shaped ring. The connecting lug 3370 is a thin plate with a connecting hole. After the U-shaped ring is locked to the second oblique connection fitting 3242 via fasteners, it is also locked and secured to the connecting hole in the connecting lug 3370 via fasteners. In other embodiments, the second oblique connection fitting 3242 can also be connected to the tower pole 3110 via a connecting rod 3310, which is not limited here.

[0163] See Figure 25 This application also protects an end fitting, and the end fitting 4000 has the same structure as the end fitting in the aforementioned embodiment. For details, please refer to the aforementioned embodiment and will not be repeated here.

[0164] See Figure 26 The present application also protects a composite cross arm, which has the same structure as the composite cross arm 5000 in the aforementioned embodiment. For details, please refer to the aforementioned embodiment, which will not be described here.

[0165] The above description is only an implementation method of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A composite cross arm, characterized in that: The composite cross-arm includes a post insulator and three diagonal insulators, one end of each of the post insulator and the diagonal insulator is used to connect to the tower body of the transmission tower, and the other ends are connected together through end fittings to form the end of the composite cross-arm for hanging the transmission line, wherein the three diagonal insulators are arranged at intervals around the post insulator, and the axes of two of the diagonal insulators are in the same plane as the axis of the post insulator, and the two diagonal insulators whose axes are in the same plane as the axis of the post insulator are defined as first diagonal insulators, and the remaining diagonal insulators are defined as second diagonal insulators, wherein the angle between the two first diagonal insulators ranges from 45° to 90°, and the angle between the second diagonal insulator and the post insulator ranges from 25° to 45°; The end fitting includes a first flange tube which is sleeved on the end of the insulator in the post insulator and is axially arranged as a hollow structure, and a sealing plate which covers one end of the first flange tube; The inner wall of the first flange cylinder is provided with a plurality of adhesive grooves spaced apart in the axial direction and a connecting groove connecting the plurality of adhesive grooves. The adhesive grooves and the connecting grooves are filled with adhesive to securely connect the first flange cylinder and the insulator. The width of the adhesive groove does not exceed 12 mm. The ratio of the length of the contact portion between the inner wall of the first flange cylinder and the insulator and the outer diameter of the insulator is in a range of 0.8 to 1.

2. At the same time, the plate surface of the sealing plate facing the insulator is provided with a first sealing groove facing the end face of the insulator, and a first sealing member is provided in the first sealing groove. The inner wall of the first flange cylinder is also provided with a second sealing groove adjacent to the sealing plate. The second sealing groove and the multiple glue grooves are arranged in sequence in a direction away from the sealing plate, and a second sealing member is provided in the second sealing groove.

2. The composite cross arm according to claim 1, characterized in that: The distances between the second oblique-pull insulator and the two first oblique-pull insulators are equal.

3. The composite cross arm according to claim 1, characterized in that: The composite cross-arm further includes a first oblique-stayed connection fitting for connecting the tower body and the first oblique-stayed insulator, wherein the first oblique-stayed connection fitting includes: a first sub-connecting fitting connected to the first oblique-pull insulator; One end of the second sub-connecting fitting is connected to the first sub-connecting fitting in an adjustable manner, and the other end is used to connect to the tower body, thereby achieving the connection between the first oblique insulator and the tower body.

4. The composite cross arm according to claim 3, characterized in that: The first sub-connecting fitting is provided with a plurality of first mounting portions arranged in an arc shape, and the second sub-connecting fitting is selectively connected to one of the first mounting portions.

5. The composite cross arm according to claim 1, characterized in that: The composite crossarm further includes a second obliquely-stayed connection fitting, which is used to connect the tower body and the second obliquely-stayed insulator, wherein the length of the second obliquely-stayed connection fitting is fixed.

6. The composite cross arm according to claim 1, characterized in that: The composite cross-arm further includes a support connection hardware for connecting the tower body and the support insulator, and the support connection hardware includes: An end flange cylinder is sleeved on the end where the support insulator is connected to the tower body; an end flange, covering an end of the end flange cylinder away from the post insulator; The first mounting plate has an end portion abutting against a disk surface of the end flange away from the end flange cylinder and is used for connecting to the tower body.

7. The composite cross arm according to claim 6, characterized in that: There are two first mounting plates, and both first mounting plates are arranged perpendicular to the end flange.

8. The composite cross arm according to claim 6, characterized in that: The first mounting plate is provided with a second mounting portion for mounting the first mounting plate on the tower body.

9. The composite cross arm according to claim 8, characterized in that: The second mounting portion is a through hole for a fastener to pass through to mount the first mounting plate on the tower body.

10. A transmission tower, characterized in that: The transmission tower comprises a tower body and the composite cross arm according to any one of claims 1 to 9 connected to the tower body.

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