Composite cross arm and transmission tower

Abstract

The present application discloses a composite cross arm, which is installed on a tower body. The composite cross arm includes: a post insulator and three stay insulators. One end of the post insulator and the stay insulators are connected together to form an end of the composite cross arm for hanging transmission lines. Among them, the three stay insulators are arranged at intervals around the post insulator; a cross arm connecting fitting, which connects the other end of the post insulator and the other ends of the stay insulators to the tower pole, thereby realizing the installation of the composite cross arm on the tower body. The present application also discloses a transmission tower. The present application is configured to improve the stability performance of the transmission tower.

Description

Technical Field

[0001] This application relates to the technical field of power transmission, and particularly to a composite cross arm and a transmission tower. Background Art

[0002] Due to advantages such as light weight, high strength, corrosion resistance, easy processing, good designability, and good insulation performance, composite materials are one of the ideal materials for constructing the structure of transmission poles and towers. Moreover, the poles and 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, resistance to high and low temperatures, high strength, low possibility of theft, and low line maintenance costs.

[0003] The inventors of this application found that the performance of the current poles and towers made of composite materials needs to be improved. For example, the composite cross arm includes an insulating rod, which is relatively thin and cannot meet the support requirements for high-voltage transmission lines. Summary of the Invention

[0004] To solve the above technical problems, a technical solution adopted in this application is: to provide a composite cross arm installed on a tower body. The tower body includes a tower pole. The composite cross arm is characterized in that it includes: a tower body including a tower pole; a composite cross arm including a post insulator and three stay insulators. One end of the post insulator and the stay insulators are connected together to form the end of the composite cross arm for hanging transmission lines. Among them, the three stay insulators are arranged at intervals around the post insulator; a cross arm connecting fitting that connects the other end of the post insulator and the other ends of the stay insulators to the tower pole, thereby realizing the installation of the composite cross arm on the tower body.

[0005] The above-mentioned composite cross arm is provided with a post insulator and three stay insulators, and one end of the post insulator and the stay insulators are connected together. At the same time, the three stay insulators are arranged at intervals around the post insulator, so that a stable triangular structure is formed between the composite cross arm and the tower pole, which can greatly improve the stability of the composite cross arm.

[0006] Among them, the axes of two of the stay insulators are in the same plane as the axis of the post insulator. The two stay insulators whose axes are in the same plane as the axis of the post insulator are both defined as the first stay insulators, and the remaining stay insulator is defined as the second stay insulator; the cross arm connecting fitting includes: two connecting rods that respectively connect the two first stay insulators to the tower pole; a tower body flange cylinder with one end connected to the tower pole; a tower body flange plate that covers the end of the tower body flange cylinder away from the tower pole and is connected to the post insulator.

[0007] The above-mentioned cross-arm connecting fitting includes a connecting rod for connecting the first stay insulator to the tower pole, which can facilitate the installation of the first stay insulator on the tower pole. At the same time, the cross-arm connecting fitting further includes a tower body flange cylinder with one end connected to the tower pole and a tower body flange plate covering the end of the tower body flange cylinder away from the tower pole. Connecting the tower body flange plate with the post insulator can ensure the installation stability of the post insulator.

[0008] Wherein, the cross-arm connecting fitting further includes: a reinforcing ring sleeved on the periphery of the tower pole; a reinforcing rib, with both ends of the reinforcing rib respectively connected to the reinforcing ring and the tower body flange cylinder, and one side wall of the reinforcing rib being in contact with the tower pole.

[0009] The above-mentioned cross-arm connecting fitting further includes a reinforcing ring and a reinforcing rib, which can indirectly increase the contact area between the tower body flange cylinder and the tower pole and ensure the connection strength between the tower body flange cylinder and the tower pole.

[0010] Wherein, the cross-arm connecting fitting further includes: a reinforcing plate, with both ends of the reinforcing plate respectively connected to the connecting rod and the tower body flange cylinder, and one side wall of the reinforcing plate being in contact with the tower pole.

[0011] The above-mentioned cross-arm connecting fitting further includes a reinforcing plate, which indirectly increases the contact area among the connecting rod, the tower body flange cylinder and the tower pole and ensures the connection strength among the connecting rod, the tower body flange cylinder and the tower pole.

[0012] Wherein, the number of the reinforcing rings is two, and the two reinforcing rings are arranged on both sides of the tower body flange cylinder, and the reinforcing ribs are connected between the two reinforcing rings and the tower body flange cylinder.

[0013] The above-mentioned arrangement of providing reinforcing rings on both sides of the tower body flange cylinder and connecting the reinforcing ribs between the reinforcing rings and the tower body flange cylinder can further increase the contact area between the tower body flange cylinder and the tower pole and ensure the connection strength between the tower body flange cylinder and the tower pole.

[0014] Wherein, the post insulator includes: an insulator; a post connecting fitting, with one end of the insulator connected with the post connecting fitting to install the post insulator on the tower body flange plate. The post connecting fitting includes: an end flange cylinder axially arranged as a hollow structure and sleeved on one end of the insulator; an end flange plate covering the end of the end flange cylinder away from the insulator. Wherein, the end flange plate is butted against the tower body flange plate to realize the installation of the post insulator on the tower body flange plate.

[0015] The above-mentioned arrangement of covering the end of the end flange cylinder away from the insulator with the end flange plate can prevent external water vapor, etc. from corroding the insulator and extend the service life of the post insulator.

[0016] Wherein, the cross-arm connecting fitting further includes a connecting ear, and the connecting ear is fixed on the tower pole; the ends of the three stay insulators are all connected with stay connecting fittings. Among them, the stay connecting fitting connected to the end of the first stay insulator is connected to the connecting rod, and the stay connecting fitting connected to the end of the second stay insulator is connected to the connecting ear.

[0017] Setting the first stay insulator to be connected to the connecting rod through the stay connecting fitting, while the second stay insulator is connected to the connecting ear through the stay connecting fitting can ensure the connection stability between the composite cross-arm and the tower pole.

[0018] Wherein, the stay connecting fitting includes: a first sub-connecting fitting connected to the stay insulator; a second sub-connecting fitting, one end of which is connected to the first sub-connecting fitting in an adjustable position, and the other end is connected to the connecting rod or the tower pole.

[0019] Setting the second sub-connecting fitting in the stay connecting fitting to be connected to the first sub-connecting fitting in an adjustable position enables the length of the stay connecting fitting to be adjustable, making the stay connecting fitting flexible and versatile with a wide range of applications.

[0020] Wherein, the angle range between the two first stay insulators is 45° to 90°, and the angle range between the second stay insulator and the post insulator is 25° to 45°.

[0021] Setting the angle range between the two first stay insulators to be 45° to 90° and the angle range between the second stay insulator and the post insulator to be 25° to 45° can improve the mechanical properties of the composite cross-arm, and further improve the mechanical properties of the transmission tower.

[0022] To solve the above technical problems, another technical solution adopted in this application is: to provide a transmission tower, which includes a tower body and a composite cross-arm connected to the tower body as described above.

[0023] The beneficial effect of this application is: this application sets the composite cross-arm to include a post insulator and three stay insulators, and one end of the post insulator and the stay insulators are connected together. At the same time, the three stay insulators are arranged at intervals around the post insulator, so that a stable triangular structure is formed between the composite cross-arm and the tower pole, which can greatly improve the stability performance of the composite cross-arm.

[0024] At the same time, the cross-arm connecting fitting is set to include a connecting rod connecting the first stay insulator and the tower pole, which can facilitate the installation of the first stay insulator on the tower pole. At the same time, the cross-bar connecting fitting also includes a tower body flange cylinder with one end connected to the tower pole and a tower body flange plate covering the end of the tower body flange cylinder away from the tower pole. Connecting the tower body flange plate with the post insulator can ensure the installation stability of the post insulator.

[0025] Meanwhile, the cross-arm connecting fitting further includes a reinforcing ring and reinforcing ribs, which can indirectly increase the contact area between the tower body flange cylinder and the tower pole, and ensure the connection strength between the tower body flange cylinder and the tower pole.

[0026] In addition, the cross-arm connecting fitting further includes a reinforcing plate, which indirectly increases the contact area among the connecting rod, the tower body flange cylinder and the tower pole, and ensures the connection strength among the connecting rod, the tower body flange cylinder and the tower pole. Brief Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings. Among them:

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

[0029] Figure 2 is Figure 1 a schematic structural diagram of the composite cross-arm in ;

[0030] Figure 3 is Figure 2 an enlarged schematic diagram of part A in ;

[0031] Figure 4 is Figure 2 a schematic structural diagram when the post insulator is connected to the end fitting in ;

[0032] Figure 5 is Figure 4 a sectional schematic diagram of the structure along the C-C section in ;

[0033] Figure 6 is Figure 3 a schematic structural diagram of the end fitting in ;

[0034] Figure 7 is Figure 3 a schematic structural diagram of the end fitting from another perspective in ;

[0035] Figure 8 is a schematic structural diagram when the suspension plate is connected to the clamp in an application scenario;

[0036] Figure 9 is a schematic structural diagram of the link plate;

[0037] Figure 10 is Figure 7 a sectional schematic diagram of the end fitting along the D-D section;

[0038] Figure 11 is Figure 10 An enlarged schematic view of the position E in

[0039] Figure 12 is Figure 10 An enlarged schematic view of the position F in an application scenario

[0040] Figure 13 is Figure 10 An enlarged schematic view of the position F in another application scenario

[0041] Figure 14 is Figure 2 An enlarged schematic view of the position B in

[0042] Figure 15 is Figure 1 An enlarged schematic view of the position H in

[0043] Figure 16 is Figure 2 An enlarged schematic view of the position I in

[0044] Figure 17 is a schematic view of the structure of a composite cross arm in another embodiment

[0045] Figure 18 is Figure 17 An enlarged schematic view of the position G in

[0046] Figure 19 is Figure 18 A schematic view of the structure of the end fitting in

[0047] Figure 20 is Figure 19 An exploded schematic view of the end fitting

[0048] Figure 21 is a schematic view of the structure of another embodiment of the transmission tower of this application

[0049] Figure 22 is Figure 21 A partial schematic view of

[0050] Figure 23 is Figure 22 An enlarged schematic view of the position J in

[0051] Figure 24 is Figure 21 A partial schematic view of

[0052] Figure 25 is a schematic view of the structure of an embodiment of the end fitting of this application

[0053] Figure 26 is a schematic view of the structure of an embodiment of the composite cross arm of this application Detailed implementation manners

[0054] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0055] Refer to 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. At the same time, the composite cross arm 1200 includes a post insulator 1210 and a stay insulator 1220.

[0056] The tower body 1100 can be a transmission tower structure with common structures such as a lattice tower, a pole, or a composite material tower. In this embodiment, the tower body 1100 is a lattice tower, and only a part of its structure is shown in the drawings.

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

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

[0059] Continue to refer to Figure 2, in this embodiment, the number of stay insulators 1220 is three. Among them, two stay insulators 1220 whose axes are in the same plane as the axis of the post insulator 1210 are both defined as the first stay insulators 1221, and the remaining stay insulator 1220 is defined as the second stay insulator 1222. Among them, the distance from the second stay insulator 1222 to the two first stay insulators 1221 is equal, and the angular range between the two first stay insulators 1221 is 45° to 90°, for example, 45°, 60° or 90°. The angular range between the second stay insulator 1222 and the post insulator 1210 is 25° to 45°, for example, 25°, 30°, 35° or 45°.

[0060] Specifically, considering that the greater the angle between the two first stay insulators 1221, the greater the mechanical strength that the composite cross arm 1200 can withstand, but the length of the composite cross arm 1200 and the width of the tower body 1100 also need to be increased accordingly. Therefore, the included angle range of the two first stay insulators 1221 is controlled within 45° to 90°, which not only meets the force requirements of the composite cross arm 1200 but also optimizes the length of the composite cross arm 1200 and the width of the tower body 1100. Similarly, controlling the included angle range between the second stay insulator 1222 and the post insulator 1210 within 20° to 45° can also achieve the same purpose.

[0061] Specifically, three groups of composite cross arms (not shown in the figure) are sequentially arranged on the tower body 1100 from top to bottom. The lengths of the three groups of composite cross arms are decreasing, increasing or in other forms. That is to say, the length of the post insulator is decreasing, increasing or in other forms from bottom to top, and the greater the length of the post insulator 1210, the smaller the angle between the two first stay insulators 1221. Assuming that the angle between the two first stay insulators 1221 is α, the length of the post insulator 1210 is L, the width of the tower body 1100 perpendicular to the post insulator in the horizontal direction is D, the width of the tower body 1100 parallel to the post insulator 1210 in the horizontal direction is n, and the distance from the connection points where the two first stay insulators 1221 extend out of the tower body 1100 to the tower body 1100 is m. From the trigonometric formula, it can be obtained that:

[0062]

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

[0064] Similarly, assume that the included angle between the second stay insulator 1222 and the post insulator 1210 is β, and at the same time assume that the distance between the connection point of the post insulator 1210 on the tower body 1100 and the connection point of the second stay insulator 1222 on the tower body 1100 is H. According to the trigonometric formula, it can be obtained that:

[0065]

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

[0067] At the same time, setting the angle range between the two first stay insulators 1221 to be 45° to 90° can provide favorable conditions for setting a first grading ring (not shown in the figure) and an end fitting 1230 at the high-voltage end (the end far from the tower body 1100) of the post insulator 1210, and setting a second grading ring 12201 at the high-voltage ends (the ends far from the tower body 1100) of the two first stay insulators 1221. Specifically, it can ensure that there is no interference between the first grading ring on the post insulator 1210 and the second grading ring 12201 on the first stay insulator 1221, no interference between the second grading rings 12201 on the two first stay insulators 1221, and no interference between the first grading ring on the post insulator 1210, the second grading ring 12201 on the first stay insulator 1221 and the end fitting 1230.

[0068] And setting the angle range between the second stay insulator 1222 and the post insulator 1210 to be 25° to 45° can provide favorable conditions for setting a first grading ring at the high-voltage end of the post insulator 1210 and setting a third grading ring 12202 at the high-voltage end (the end far from the tower body 1100) of the second stay insulator 1222. Specifically, it can ensure that there is no interference when the first grading ring set on the post insulator 1210 and the third grading ring 12202 set on the second stay insulator 1222 are installed in a staggered manner.

[0069] Continue to refer to Figure 1 and Figure 2, in this embodiment, the post insulator 1210 and the two first stay insulators 1221 are installed at the same height, and at the same time, the second stay insulator 1222 is located above the post insulator 1210. It should be noted that in other embodiments, when the number of the second stay insulators 1222 is more than one, the second stay insulators 1222 can be arranged both above and below the post insulator 1210, so as to balance the tensile forces of the transmission conductors in all directions.

[0070] Among them, the post insulator 1210 can be horizontally arranged ( Figure 1 is schematically shown in the horizontal arrangement), or can be inclined.

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

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

[0073] Refer to Figure 4 and Figure 5 , in this embodiment, the post insulator 1210 includes an insulator 1211 and a skirt 1212 coated on the periphery of the insulator 1211.

[0074] Specifically, the insulator 1211 can be a solid insulating core or a hollow insulating tube. Among them, when the insulator 1211 is a solid insulating core, it can be a solid core rod formed by winding or pultruding or pultrusion winding of glass fiber or aramid fiber impregnated with epoxy resin. When the insulator 1211 is a hollow insulating tube, it can be a hollow pultruded tube formed by pultrusion winding of glass fiber or aramid fiber impregnated with epoxy resin, or a glass steel pipe formed by winding and curing or pultruding of glass fiber impregnated with epoxy resin, or an aramid fiber tube formed by winding and curing of aramid fiber impregnated with epoxy resin, which is not limited here.

[0075] Among them, the insulator 1211 can be cylindrical (schematically shown as cylindrical in the drawings), conical or other shapes (such as drum-shaped), which is not limited here. Among them, when the insulator 1211 is conical, its tapered end (the end with a smaller diameter) is connected to the end fitting 1230, and the other end is connected to the tower body 1100.

[0076] In an application scenario, when the insulator 1211 is a hollow insulating tube, an insulating gas is sealed inside the insulator 1211, and the absolute pressure value range of the insulating gas is 0.1 - 0.15 Mpa. For example, 0.1 Mpa, 0.12 Mpa, or 0.15 Mpa.

[0077] Specifically, the gas sealed inside the hollow insulating tube can be high-purity nitrogen, air, sulfur hexafluoride, or other gases that have been dried, without limitation here.

[0078] At the same time, setting the absolute pressure value range of the insulating gas to 0.1 - 0.15 Mpa can make the insulating gas not easily leak from the hollow insulating tube, exempting the post insulator 1210 from daily maintenance and monitoring, and can also meet the different pressure usage requirements existing between different regions and altitudes, thus ensuring that the internal gas of the hollow insulating tube is in a non-negative pressure state when used in different regions, and can also make the hollow insulating tube have a larger margin for micro-water control, effectively reducing the difficulty of micro-water control.

[0079] In other application scenarios, when the insulator 1211 is a hollow insulating tube, the gas sealed inside it can also be an inert gas or solid materials such as polyurethane and liquid silicone rubber, without limitation here.

[0080] At the same time, the umbrella skirt 1212 can be made of materials such as high-temperature vulcanized silicone rubber, liquid silicone rubber, or room-temperature vulcanized silicone rubber, without limitation here.

[0081] In an application scenario, the umbrella skirt 1212 includes a plurality of spaced and identical umbrella bodies, that is, all the umbrella bodies are the same. At the same time, the umbrella bodies are radially symmetric with respect to the insulator 1211, that is, the inclination directions of the two surfaces of the umbrella bodies facing away from each other are opposite and the inclination angles are the same. Specifically, setting the umbrella bodies to be radially symmetric with respect to the insulator 1211, on the one hand, compared with the prior art where the two surfaces of the umbrella bodies facing away from each other are inclined in the same direction, it can make rainwater flow down along the umbrella skirt 1212 (if the two surfaces of the umbrella bodies facing away from each other are inclined in the same direction, rainwater is likely to accumulate in the angle between the post insulator 1210 and the umbrella body), thus not forming a water film on the surface of the umbrella skirt 1212 and being conducive to the self-cleaning of the umbrella skirt 1212. On the other hand, it can make the two sides of the umbrella bodies facing away from each other have the same mechanical properties, making the post insulator 1210 have the characteristics of pollution resistance, rain flash resistance, ice flash resistance, and being more economical.

[0082] In an application scenario, in order to avoid the formation of turbulence and dirt accumulation between adjacent umbrella bodies, which may cause bridging, the distance between adjacent umbrella bodies is greater than 40 mm and does not exceed 60 mm. For example, it can be 45 mm, 50 mm or 60 mm. Of course, the distance between adjacent umbrella bodies should be minimized as much as possible. In this way, the distribution density of the umbrella bodies can be increased, making it inconvenient for birds to stand on the sheath, thus preventing bird damage accidents. At the same time, under the requirement of ensuring the minimum creepage distance, the height of the umbrella body protruding from one side of the insulator 1211 is not greater than 80 mm, and is generally set to 50 mm - 80 mm, such as 50 mm, 60 mm or 70 mm, etc.

[0083] It should be noted that in other embodiments, the umbrella skirt 1212 can also be other structures. For example, the sizes of adjacent umbrella bodies are different, or the two surfaces of the umbrella bodies facing away from each other are inclined in the same direction. In short, the specific structure of the umbrella skirt 1212 in this application is not limited.

[0084] Combined with Figure 3 、 Figure 6 and Figure 7 In this embodiment, the end fitting 1230 includes a first flange cylinder 1231, a sealing plate 1232 and a suspension plate 1233.

[0085] The first flange cylinder 1231 is axially arranged as a hollow structure for sleeving on the end of the post insulator 1210, specifically for sleeving on the end of the insulator 1211 in the post insulator 1210; the sealing plate 1232 seals one end of the first flange cylinder 1231; the suspension plate 1233 is arranged on the side of the sealing plate 1232 away from the first flange cylinder 1231 and is connected to the sealing plate 1232 for hanging the transmission line.

[0086] Specifically, when the suspension plate 1233 for hanging the transmission line is damaged and needs to be replaced, since the sealing plate 1232 seals one end of the first flange cylinder 1231, it can ensure that the post insulator 1210 inside the first flange cylinder 1231 is not corroded by external water vapor, etc., thus ensuring the service life of the post insulator 1210.

[0087] Continue to refer to Figure 6 and Figure 7 One end of the suspension plate 1233 abuts against the plate surface of the sealing plate 1232 on the side away from the first flange cylinder 1231. At the same time, a reinforcing member 1234 is also connected between the side surface of the suspension plate 1233 and the sealing plate 1232.

[0088] Specifically, the setting of the reinforcing member 1234 plays a role in strengthening the connection between the suspension plate 1233 and the sealing plate 1232, avoiding the fracture due to insufficient connection strength between the suspension plate 1233 and the sealing plate 1232.

[0089] In an application scenario, such as Figure 6 shown, the reinforcing member 1234 is a plate member, and the sealing plate 1232, the wire hanging plate 1233, and the reinforcing member 1234 are perpendicular to each other in pairs.

[0090] Among them, in order to prevent the end fitting 1230 from being corroded by water vapor, etc., the surface of the end fitting 1230 is treated with hot-dip galvanizing. At the same time, the internal material of the end fitting 1230 can be materials such as cast aluminum, cast iron, or alloy steel, which is not limited here.

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

[0092] Continuing to refer to Figure 6 , the wire hanging plate 1233 is provided with a first wire hanging portion 12331 that can be used to hang the power transmission line. Specifically, the first wire hanging portion 12331 is used to install a wire clamp for connecting the power transmission line, so as to realize hanging the power transmission line. Among them, the number of the first wire hanging portions 12331 can be one, two, four, or even more, which is not limited here. Among them, when the number of the first wire hanging portions 12331 is multiple, multiple first wire hanging portions 12331 can respectively install and connect multiple wire clamps of the same power transmission line, so that when one of the wire clamps is damaged, it can still ensure the safe suspension of the power transmission line.

[0093] In an application scenario, such as Figure 6 shown, the first wire hanging portion 12331 is a wire hanging through hole, and the side surface of the wire hanging plate 1233 without the first wire hanging portion 12331 is connected to the reinforcing member 1234. Specifically, this setting can ensure that the reinforcing member 1234 does not affect the installation of the wire clamp on the wire hanging plate 1233.

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

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

[0096] When the wire hanging plate 1233 is used for hanging two wires, the wire hanging plate 1233 is also connected to the U-shaped hanging ring 123301. However, different from hanging a single wire, at this time, the U-shaped hanging ring 123301 is also connected to an intermediate connecting plate, and then the intermediate connecting plate is connected to two wire clamps 123302 respectively used for hanging wires. In an application scenario, the cross-section of the intermediate connecting plate is generally an isosceles triangle, the two wire clamps 123302 are respectively connected to the two base angles of the intermediate connecting plate, and the U-shaped hanging ring 123301 is connected to the top angle of the intermediate connecting plate.

[0097] In an application scenario, referring to Figure 9 , the composite cross arm 1200 further includes a connecting plate 1235, which is used to connect to the wire hanging plate 1233, and the connecting plate 1235 is provided with a second wire hanging portion 12351 that can be used for hanging transmission lines. Among them, the number of the second wire hanging portions 12351 is greater than the number of the first wire hanging portions 12331. Specifically, due to area limitations, the number of the first wire hanging portions 12331 that can be set on the wire hanging plate 1233 is limited and cannot meet the wire hanging requirements in some application scenarios. The setting of the connecting plate 1235 can play a role in expanding the number of the first wire hanging portions 12331.

[0098] In an application scenario, in order to meet the requirements in different application scenarios, the connecting plate 1235 is connected to the wire hanging plate 1233 through a connection fitting with adjustable length (not shown in the figure), so that the relative distance between the connecting plate 1235 and the wire hanging plate 1233 can be adjusted according to requirements in different application scenarios.

[0099] In an application scenario, the structure of the second wire hanging portion 12351 is the same as that of 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 can also be different. For example, the first wire hanging portion 12331 is a wire hanging through hole, while the second wire hanging portion 12351 is a wire hanging slot. All in all, the specific structures of the first wire hanging portion 12331 and the second wire hanging portion 12351 are not limited in this application.

[0100] Combined with Figure 3 、 Figure 6 and Figure 7 , in this embodiment, the end fitting 1230 further includes a connecting plate 1236, which is disposed around the first flange cylinder 1231 and connected to the first flange cylinder 1231 for connecting the stay insulator 1220.

[0101] Specifically, the connecting plate 1236 can be disposed around the first flange cylinder 1231 by means such as welding.

[0102] Among them, the connecting plate 1236 disposed around the outer periphery of the first flange cylinder 1231 is used to connect the stay insulator 1220, which can avoid damaging the first flange cylinder 1231 (such as opening holes in the first flange cylinder 1231) in order to directly connect the stay insulator 1220 to the first flange cylinder 1231, thereby ensuring the strength of the first flange cylinder 1231.

[0103] In this embodiment, the number of the connecting plates 1236 can be one or at least two. When there is one connecting plate 1236, in order to connect all the stay insulators 1220, the connecting plate 1236 can extend around the first flange cylinder 1231 to form a semi-surrounding structure or a full-surrounding structure. When the number of the connecting plates 1236 is at least two, different connecting plates 1236 can be connected to different stay insulators 1220. That is to say, at this time, the number of the connecting plates 1236 can be equal to the number of the stay insulators 1220, and at this time, at least two connecting plates 1236 are arranged at intervals along the circumferential direction of the first flange cylinder 1231 (as Figure 3 and Figure 6 shown).

[0104] Combined with Figure 7 and Figure 10 , in this embodiment, a plurality of cementing grooves 12311 arranged at intervals along the axial direction and a flow-through groove 12312 communicating with the plurality of cementing grooves 12311 are provided on the inner wall of the first flange cylinder 1231. Among them, the cementing grooves 12311 and the flow-through groove 12312 are filled with an adhesive to fixedly connect the first flange cylinder 1231 and the insulator 1211.

[0105] Specifically, in the production process, the end fitting 1230 and the post insulator 1210 are connected together by using a horizontal cementing process or a vertical cementing process: in the production process, the adhesive is first injected between the first flange cylinder 1231 and the insulator 1211 through the injection hole, and then after a certain period of high-temperature curing, the end fitting 1230 and the post insulator 1210 can be fixedly connected together.

[0106] The arrangement of the flow-through groove 12312 can enable the adhesive injected between the first flange cylinder 1231 and the insulator 1211 to flow between adjacent cementing grooves 12311, thereby improving the injection rate, reducing the risk of air bubble retention, making the combination of the end fitting 1230 and the insulator 1211 more firm, and thus improving the anti-torsion performance of the composite cross arm 1200 without replacing the adhesive with better bonding performance.

[0107] Among them, the number of the flow channels 12312 can be one or multiple (for example, two, four, six or even more), and when the number of the flow channels 12312 is multiple, the multiple flow channels 12312 are arranged at intervals along the circumferential direction of the first flange cylinder 1231. Among them, one flow channel 12312 can only communicate with two adjacent cementing grooves 12311, or can communicate with three, four or even all the cementing grooves 12311, which is not limited here.

[0108] Among them, the bottom surface of the flow channel 12312 is a plane or a curved surface. Specifically, when the radial depth and width of the flow channel 12312 relative to the end fitting 1230 are certain, the flow channel 12312 with a plane bottom surface is more complex and costly to process than the flow channel 12312 with a curved surface bottom surface, but its torsional strength is higher. This is because the contact area between the adhesive in the plane groove and the inner wall of the first flange cylinder 1231 is larger. That is to say, the flow channel 12312 with a curved surface bottom surface is more convenient and less costly to process than the flow channel 12312 with a plane bottom surface, but its torsional strength is slightly lower.

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

[0110] Among them, the width of the cementing groove 12311 does not exceed 12 mm. Specifically, the axial shear strength of the insulator 1211 itself is relatively low. When it is damaged, the first part to be damaged is the part that is sleeved into the first flange cylinder 1231 and not bonded with an adhesive, that is, the part of the insulator 1211 adjacent to the two cementing matching grooves. When the width of the first flange cylinder 1231 is fixed, if the width of the cementing groove 12311 decreases, the distance between two adjacent cementing grooves 12311 will increase, that is, the distance between two adjacent cementing matching grooves on the insulator 1211 will increase, and the strength of its shear failure will increase. Eventually, the shear resistance of the post insulator 1210 of the same specification is enhanced. However, if the width of the cementing groove 12311 is too small, it will lead to an increase in processing time and processing costs. Therefore, the width of the cementing groove 12311 is set not to exceed 12 mm. For example, 12 mm, 10 mm or 8 mm, etc., which can not only ensure the strength of the composite cross arm 1200, but also ensure that the processing time and processing costs are within a reasonable range.

[0111] Among them, for the convenience of processing, the bottom surface of the cementing groove 12311 is a curved surface.

[0112] Among them, the ratio of the length of the part where the inner wall of the first flange cylinder 1231 contacts the insulator 1211 to the outer diameter of the insulator 1211 (i.e., the cementing ratio) ranges from 0.8 to 1.2. For example, 0.8, 1.0 or 1.2. Specifically, as the cementing ratio decreases, the strength of the composite cross arm 1200 will decrease significantly. For example, compared with the cementing ratio of 0.8, when the cementing ratio drops to 0.75, the strength of the composite cross arm 1200 will decrease by 20%. And compared with the cementing ratio of 1.2, when the cementing ratio rises to 1.4, although the strength of the composite cross arm 1200 will increase slightly, the cost increases significantly. Therefore, setting the cementing ratio range from 0.8 to 1.2 can enable the composite cross arm 1200 to have the advantages of low cost and high strength at the same time.

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

[0114] In an application scenario, combined with Figure 5 、 Figure 7 、 Figure 10 and Figure 12, on the plate surface of the sealing plate 1232 facing the insulator 1211, there is a first sealing groove 12321 facing the end face of the insulator 1211, and a first sealing member (not shown in the figure) is provided in the first sealing groove 12321. Specifically, the first sealing member is arranged in the first sealing groove 12321 to prevent external water vapor or adhesive from entering the insulator 1211, thereby avoiding gas leakage in the insulator 1211, and preventing external water vapor or adhesive from entering the sealing plate 1232, thus affecting the seal between the insulator 1211 and the end fitting 1230.

[0115] Continue to refer to Figure 10 and Figure 12 , on the inner wall of the first flange cylinder 1231, there is also a second sealing groove 12313 adjacent to the sealing plate 1232. The second sealing groove 12313 and the plurality of potting grooves 12311 are arranged at intervals in sequence along the direction away from the sealing plate 1232, and a second sealing member (not shown in the figure) is provided in the second sealing groove 12313. Specifically, the function of the second sealing member is different from that of the first sealing member. The second sealing member is used to prevent the adhesive during the potting process from entering the first sealing groove 12321 and corroding the first sealing member, resulting in the failure of the first sealing member.

[0116] Among them, the width of the first sealing groove 12321 and / or the second sealing groove 12313 remains unchanged (as shown in Figure 12 ) or gradually becomes smaller (as shown in Figure 13 ) in the direction close to the insulator 1211. Specifically, the first sealing groove 12321 with a width that remains unchanged in the direction close to the insulator 1211 is convenient to process, but the first sealing member inside it is prone to sliding or even falling off. At this time, in order to prevent the first sealing member from sliding relative to the first sealing groove 12321, the first sealing member is adhesively fixed in the first sealing groove 12321 by resin or silica gel; compared with the first sealing groove 12321 with a width that remains unchanged in the direction close to the insulator 1211, although the first sealing groove 12321 with a width that gradually becomes smaller in the direction close to the insulator 1211 has a more complex processing process, it can ensure that the first sealing member will not easily fall off. Among them, the width of the first sealing groove 12321 and / or the second sealing groove 12313 in the direction close to the insulator 1211 can become smaller in a straight line (as shown in Figure 13 ) or in a curve, and no limitation is made here.

[0117] Combined with Figure 2 and Figure 14 , in this embodiment, the composite cross arm 1200 further includes a stay connection fitting 1240 for connecting the tower body 1100 and the stay insulator 1220.

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

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

[0120] The first sub-connection fitting 12411 is connected to the first stay insulator 1221; one end of the second sub-connection fitting 12412 is adjustably connected to the first sub-connection fitting 12411, and the other end is used to connect to the tower body 1100, thereby realizing the connection between the first stay insulator 1221 and the tower body 1100. Specifically, setting one end of the second sub-connection fitting 12412 to be adjustably connected to the first sub-connection fitting 12411 can make the structure of the composite cross arm 1200 variable and suitable for different application scenarios.

[0121] In an application scenario, as Figure 14 shown, the first sub-connection fitting 12411 is provided with a plurality of first mounting portions 124111 arranged in an arc, and the second sub-connection fitting 12412 is selectively connected to one of the first mounting portions 124111. Specifically, the plurality of first mounting portions 124111 are arranged in an arc, which can make the distance and relative angle between the tower body 1100 and the first stay insulator 1221 adjustable.

[0122] In an application scenario, as Figure 14 shown, the first sub-connection fitting 12411 is a fan-shaped flat-foot fitting, and the second sub-connection fitting 12412 is a groove fitting.

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

[0124] In other embodiments, it may also be that the second sub-connection fitting 12412 is connected to the first stay insulator 1221, and the first sub-connection fitting 12411 is connected to the tower body 1100, which is not limited herein.

[0125] In other embodiments, the lengths of the guy connection fittings 1240 connecting the tower body 1100 and the first guy insulator 1221 and the guy connection fittings 1240 connecting the tower body 1100 and the second guy insulator 1222 can both be adjusted or both cannot be adjusted. That is to say, the first guy connection fitting 1241 or the second guy connection fitting 1242 can be used to connect the tower body 1100 and the first guy insulator 1221; similarly, the first guy connection fitting 1241 or the second guy connection fitting 1242 can be used to connect the tower body 1100 and the second guy insulator 1222, and no limitation is made here.

[0126] Combined with 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 cylinder 1251, an end flange plate 1252 and a first mounting plate 1253.

[0127] The end flange cylinder 1251 is axially arranged as a hollow structure and is sleeved on the end of the post insulator 1210 connected to the tower body 1100, specifically on one end of the insulator 1211; the end flange plate 1252 covers the end of the end flange cylinder 1251 away from the insulator 1211, which is used to prevent the end of the insulator 1211 from being corroded by external water vapor, etc., and plays a protective role for the insulator 1211; the end of the first mounting plate 1253 abuts against the disk surface of the end flange plate 1252 away from the end flange cylinder 1251. 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 to the tower body 1100 to realize the connection between the post insulator 1210 and the tower body 1100. In an application scenario, the second mounting portion 12531 is a through hole, and at this time, fasteners such as bolts can be used to pass through the through hole to mount the first mounting plate 1253 to the tower body 1100.

[0128] In an application scenario, as Figure 16 shown, the first mounting plate 1253 is a straight plate. In order to ensure the connection firmness between the tower body 1100 and the post insulator 1210, the number of the first mounting plates 1253 is two, and the two first mounting plates 1253 are arranged in parallel. Of course, in other application scenarios, the number of the first mounting plates 1253 can also be one, three, etc. At the same time, as Figure 16 shown, the two first mounting plates 1253 are both vertically arranged on the end flange plate 1252. Of course, in other application scenarios, the first mounting plate 1253 may not be vertically arranged on the end flange plate 1252, and no limitation is made here.

[0129] Continue to combine Figure 1 and Figure 15 In order to enable the strut connection fitting 1250 to adapt to different application scenarios, the strut connection fitting 1250 further 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. Thus, it is possible to set the first mounting plate 1253 to be directly connected to the tower body 1100 according to different requirements, or set the first mounting plate 1253 to be connected to the tower body 1100 through the second mounting plate 1254.

[0130] In an application scenario, as Figure 15 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 fits against the cross beam on the tower body 1100, and the other end fits against the first mounting plate 1253.

[0131] In an application scenario, in combination 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 mounts one first mounting plate 1253.

[0132] Referring to Figures 17 to 19 In a different embodiment from the above-described embodiment, in the composite cross arm 2200 of the present embodiment, the end fitting 2230 further includes a second flange cylinder 2237, which is axially provided as a hollow structure, is coaxially arranged with the first flange cylinder 2231 and is connected to the other end of the first flange cylinder 2231 away from the sealing plate 2232. Among them, the outer peripheral surface of the second flange cylinder 2237 is smooth.

[0133] Specifically, since the outer peripheral surface of the second flange cylinder 2237 is smooth, the second flange cylinder 2237 with a smooth outer peripheral surface can be fixed to the periphery of the post insulator 2210 by using a crimping process. And since the first flange cylinder 2231 is connected to the second flange cylinder 2237, when the second flange cylinder 2237 is fixed to the periphery of the post insulator 2210 by using the crimping process, the first flange cylinder 2231 can also be fixed to the periphery of the post insulator 2210, that is, the end fitting 2230 can be fixed to the periphery of the post insulator 2210 by using the crimping process.

[0134] In the foregoing embodiment, the end fitting 1230 is installed on the post insulator 1210 by means of resin bonding. Compared with the crimping process, the resin bonding process has a long process time, low forming efficiency, requires a large number of forming toolings, and the post insulator 1210 has poor resistance to bending load and torsional load after forming. That is to say, in this embodiment, the end fitting 2230 is installed on the post insulator 2210 by means of crimping, which can improve production efficiency, reduce production costs (the use of forming toolings is reduced), and ensure that the post insulator 2210 has strong resistance to bending load and torsional load.

[0135] In this embodiment, the first flange cylinder 2231 and the second flange cylinder 2237 are detachably connected. This setting allows the end fitting 2230 to be separated during transportation, facilitating transportation. Also, when the first flange cylinder 2231 or the second flange cylinder 2237 is damaged, it can be replaced in time, avoiding scrapping the entire end fitting 2230.

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

[0137] Refer to Figure 19 and Figure 20 , the end fitting 2230 further includes a first flange plate 2238 and a second flange plate 2239.

[0138] The first flange plate 2238 is disposed at the other end of the first flange cylinder 2231 away from the sealing plate 2232 and sleeved around the periphery of the first flange cylinder 2231; the second flange plate 2239 is disposed at one end of the second flange cylinder 2237 and sleeved around the periphery of the second flange cylinder 2237. Among them, the first flange plate 2238 and the second flange plate 2239 are detachably connected to achieve the detachable connection between the first flange cylinder 2231 and the second flange cylinder 2237. Specifically, this setting 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] Refer to Figure 20 , matching lock holes 22381 are respectively provided on the first flange plate 2238 and the second flange plate 2239 to connect the first flange plate 2238 and the second flange plate 2239 together by means of a locking member (such as a bolt) passing through the lock holes 22381.

[0140] In other embodiments, mating snap-fit structures may also be provided on the first flange 2238 and the second flange 2239, such that the first flange 2238 and the second flange 2239 are detachably connected by snap-fitting. In short, this application does not limit how the first flange 2238 and the second flange 2239 are detachably connected.

[0141] Among them, in other embodiments, in addition to including the first flange cylinder 2231 and the second flange cylinder 2237, the end fitting 2230 may further include a third flange cylinder, a fourth flange cylinder, or even more flange cylinders. That is, at this time, the number of flange cylinders in the end fitting 2230 is more than two, and at this time, the multiple flange cylinders in the end fitting 2230 are coaxially arranged and connected in sequence. For example, the fourth flange cylinder, the third flange cylinder, the second flange cylinder 2237, and the first flange cylinder 2231 are connected in sequence, or the second flange cylinder 2237, the fourth flange cylinder, the third flange cylinder, and the first flange cylinder 2231 are connected in sequence. At the same time, in addition to the outer peripheral surface of the second flange cylinder 2237 being smooth, the third flange cylinder, the fourth flange cylinder, or other flange cylinders may also be flange cylinders with a smooth outer peripheral surface, or in addition to being connected to the first flange cylinder 2231, the stay insulator 2220 may also be connected to the third flange cylinder, the fourth flange cylinder, or other flange cylinders.

[0142] At the same time, when the end fitting 2230 further includes a third flange cylinder, a fourth flange cylinder, or even more flange cylinders, the connection manner between adjacent two flange cylinders may be the same as the connection manner between the first flange cylinder 2231 and the second flange cylinder 2237. For example, adjacent two flange cylinders are detachably connected, and adjacent two flange cylinders are detachably connected by flange plates sleeved on their respective ends, and mating lock holes 22381 are respectively provided on the two detachably connected flange plates to connect the adjacent two flange plates together by using a locking member passing through the lock holes 22381.

[0143] Refer to Figure 21 and Figure 22 , Figure 21 are schematic structural diagrams of another embodiment of the transmission tower of this application. Figure 22 is Figure 21 Partial structural diagram in. Different from the above embodiment, the tower body 3100 in this embodiment includes a tower pole 3110, and the ends of the post insulators 3210 and the stay insulators 3220 in the composite cross arm 3200 are both connected to the tower pole 3110.

[0144] Among them, the tower pole 3110 may be a steel pipe pole, or may also be a solid pole or a hollow pole made of other materials such as composite materials, iron, alloys, etc., which is not limited herein.

[0145] Meanwhile, in order to install the composite cross arm 3200 onto the tower pole 3110, in combination with Figure 23 , the transmission tower 3000 further includes a cross arm connection fitting 3300. The cross arm connection fitting 3300 connects the ends of the post insulator 3210 and the stay insulator 3220 that are not connected to each other, and the ends of the stay insulator 3220 and the post insulator 3210 that are not connected to each other to the tower pole 3110, thereby realizing the installation of the composite cross arm 3200 onto the tower body 3100, specifically onto the tower pole 3110.

[0146] Among them, the cross arm connection fitting 3300 includes a connecting rod 3310, a tower body flange cylinder 3320, and a tower body flange plate 3330.

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

[0148] In addition, for the convenience of description, the stay connection fitting 3240 connecting the tower pole 3110 and the first stay insulator 3221 is defined as the first stay connection fitting 3241, and the stay connection fitting 3240 connecting the tower pole 3110 and the second stay insulator 3222 is defined as the second stay connection fitting 3242.

[0149] The number of connecting rods 3310 is two. The two connecting rods 3310 respectively connect the two first stay insulators 3221 to the tower pole 3110. That is to say, the first stay connection fitting 3241 connected to the end of the first stay insulator 3221 is connected to the connecting rod 3310; one end of the tower body flange cylinder 3320 is connected to the tower pole 3110; the tower body flange plate 3330 covers the end of the tower body flange cylinder 3320 away from the tower pole 3110 and is connected to the post insulator 3210.

[0150] In an application scenario, as Figure 22 and Figure 23 shown, the two connecting rods 3310 are both perpendicularly arranged with respect to the tower pole 3110, and the heights of the two connecting rods 3310 relative to the tower pole 3110 are the same.

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

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

[0153] Meanwhile, different from the above-mentioned embodiment, as Figure 22 and Figure 23 shown, the tower body flange plate 3330 in the cross arm connecting fitting 3300 is docked with the end flange plate 3252 in the strut connecting fitting 3250 to realize the installation of the strut insulator 3210.

[0154] Continue to refer to Figure 22 and Figure 23 , the cross arm connecting fitting 3300 further includes a reinforcing ring 3340 and reinforcing ribs 3350.

[0155] The reinforcing ring 3340 is sleeved on the periphery of the tower pole 3110. Both ends of the reinforcing rib 3350 are respectively connected to the reinforcing ring 3340 and the tower body flange cylinder 3320, and the side wall of the reinforcing rib 3350 is attached to the tower pole 3110, so as to further indirectly increase the contact area between the tower body flange cylinder 3320 and the tower pole 3110 and ensure the connection strength between the tower body flange cylinder 3320 and the tower pole 3110.

[0156] Among them, the number of the reinforcing rings 3340 can be one or two. When the number of the reinforcing rings 3340 is two, as Figure 23 shown, the two reinforcing rings 3340 are arranged on the opposite sides of the tower body flange cylinder 3320. For the tower body flange cylinder 3320, it is simultaneously connected to the two reinforcing rings 3340 through two reinforcing ribs 3350 respectively.

[0157] Continue to refer to Figure 22 and Figure 23 , the cross arm connecting fitting 3300 further includes a reinforcing plate 3360. Both ends of the reinforcing plate 3360 are respectively connected to the connecting rod 3310 and the tower body flange cylinder 3320, and one side wall of the reinforcing plate 3360 is attached to the tower pole 3110, so as to indirectly increase the contact area among the connecting rod 3310, the tower body flange cylinder 3320 and the tower pole 3110 and ensure the connection strength among the connecting rod 3310, the tower body flange cylinder 3320 and the tower pole 3110.

[0158] Meanwhile, in order to further increase the connection strength between the connecting rod 3310 and the tower body flange cylinder 3320, the connecting rod 3310 can also be connected to the reinforcing ring 3340 through a reinforcing rib 3350. At this time, the arrangement mode of the reinforcing rib 3350 connecting the reinforcing ring 3340 and the connecting rod 3310 is the same as that of the reinforcing rib 3350 connecting the reinforcing ring 3340 and the tower body flange cylinder 3320. For details, reference can be made to the above, and details are not described herein again.

[0159] It should be noted that the reinforcing ring 3360 and the reinforcing ring 3340 can exist simultaneously, or only one of them can exist, or neither of them exists (for details, please refer to Figure 21 and Figure 24 ).

[0160] Meanwhile, the reinforcing ring 3340, the reinforcing rib 3350 and the reinforcing plate 3360 can all be fixedly connected to the two connecting rods 3310 and the tower body flange cylinder 3320 by welding or other means to form the cross-arm connecting fitting 3300. Of course, the cross-arm connecting fitting 3300 can also be integrally formed, and no limitation is made here.

[0161] Continuing to refer to Figure 22 , the cross-arm connecting fitting 3300 further includes a connecting ear 3370. The connecting ear 3370 is fixed on the tower pole 3110. The fixing method of the connecting ear 3370 to the tower pole 3110 is the same as that of the connecting rod 3310 and the tower body flange cylinder 3320 to the tower pole 3110, and will not be elaborated here.

[0162] Among them, the guy connection fitting 3240 (the second guy connection fitting 3242) connected to the end of the second stay insulator 3222 is connected to the connecting ear 3370. Specifically, the second guy connection fitting 3242 is connected to the connecting ear 3370 through a U-shaped ring. The connecting ear 3370 is a thin plate, and a connecting hole is provided on the connecting ear 3370. After the U-shaped ring is locked and connected to the second guy connection fitting 3242 through a fastener, it is also locked and fixed to the connecting hole on the connecting ear 3370 by passing through a fastener. In other embodiments, the second guy connection fitting 3242 can also be connected to the tower pole 3110 through the connecting rod 3310, and no limitation is made here.

[0163] Referring to Figure 25 , this application also protects an end fitting. The end fitting 4000 has the same structure as the end fitting in the foregoing embodiment. For details, please refer to the above embodiment, and will not be elaborated here.

[0164] Referring to Figure 26 , this application also protects a composite cross-arm. The composite cross-arm 5000 has the same structure as the composite cross-arm in the foregoing embodiment. For details, please refer to the above embodiment, and will not be elaborated here.

[0165] The above are only the embodiments of this application, and do not limit the patent scope of this application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of this application, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of this application.

Claims

1. A composite cross arm is installed on a tower body, and the tower body includes a tower pole, characterized in that The composite cross arm includes: A post insulator and three stay insulators. One end of the post insulator and the stay insulators are connected together by an end fitting to form the end of the composite cross arm for hanging transmission lines. Among them, the three stay insulators are arranged at intervals around the post insulator; A cross arm connecting fitting that connects the other end of the post insulator and the other ends of the stay insulators to the tower pole, thereby realizing the installation of the composite cross arm on the tower body; Among them, the end fitting includes: A first flange cylinder, which is axially arranged as a hollow structure. The post insulator includes an insulator. The first flange cylinder is sleeved on the end of the insulator. The inner wall of the first flange cylinder is provided with a plurality of cementing grooves arranged at intervals along the axis of the first flange cylinder. The cementing grooves are filled with an adhesive to fixedly connect the first flange cylinder and the insulator. The width of the cementing groove does not exceed 12 mm, and the ratio of the length of the part of the inner wall of the first flange cylinder in contact with the insulator to the outer diameter of the insulator ranges from 0.8 to 1.2; A sealing plate that covers one end of the first flange cylinder. The plate surface of the sealing plate facing the insulator is provided with a first sealing groove facing the end surface of the insulator. A first sealing member is arranged in the first sealing groove. The inner wall of the first flange cylinder is provided with a second sealing groove adjacent to the sealing plate. The second sealing groove and the plurality of cementing grooves are arranged at intervals in sequence along the direction away from the sealing plate. A second sealing member is arranged in the second sealing groove.

2. The composite cross arm according to claim 1, characterized in that, The axes of two of the stay insulators and the axis of the post insulator are in the same plane. The two stay insulators whose axes are in the same plane as the axis of the post insulator are both defined as first stay insulators, and the remaining stay insulators are defined as second stay insulators; The cross arm connecting fitting includes: Connecting rods, the number of which is two. The two connecting rods respectively connect the two first stay insulators to the tower pole; A tower body flange cylinder, one end of which is connected to the tower pole; A tower body flange plate that covers the end of the tower body flange cylinder away from the tower pole and is connected to the post insulator.

3. The composite cross arm according to claim 2, characterized in that, The cross arm connecting fitting further includes: A reinforcing ring sleeved on the periphery of the tower pole; A reinforcing rib, the two ends of which are respectively connected to the reinforcing ring and the tower body flange cylinder, and one side wall of the reinforcing rib is attached to the tower pole.

4. The composite cross arm according to claim 2, wherein, The cross arm connecting fitting further includes: a reinforcing plate, the two ends of which are respectively connected to the connecting rod and the tower body flange cylinder, and one side wall of the reinforcing plate is attached to the tower pole.

5. The composite cross arm according to claim 3, characterized in that, The number of the reinforcing rings is two. The two reinforcing rings are arranged on both sides of the tower body flange cylinder, and the reinforcing ribs are connected between the two reinforcing rings and the tower body flange cylinder.

6. The composite cross arm according to claim 2, characterized in that, The post insulator further includes: A post connecting fitting. One end of the insulator is connected with the post connecting fitting to install the post insulator on the tower body flange plate. The post connecting fitting includes: An end flange cylinder, which is axially arranged as a hollow structure and is sleeved on one end of the insulator; An end flange covers one end of the end flange cylinder away from the insulator. The end flange is butted against the tower body flange to install the post insulator on the tower body flange.

7. The composite cross arm according to claim 2, wherein The cross arm connecting fitting further includes a connecting ear fixed on the tower pole. The ends of the three stay insulators are each connected with a stay connecting fitting. The stay connecting fitting connected to the end of the first stay insulator is connected with the connecting rod, and the stay connecting fitting connected to the end of the second stay insulator is connected with the connecting ear.

8. The composite cross arm according to claim 7, wherein The stay connecting fitting includes: A first sub-connecting fitting connected to the stay insulator; A second sub-connecting fitting, one end of which is adjustably connected to the first sub-connecting fitting, and the other end of which is connected to the connecting rod or the tower pole.

9. The composite cross arm according to claim 2, wherein, The angle range between the two first stay insulators is 45° to 90°, and the angle range between the second stay insulator and the post insulator is 25° to 45°.

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

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