Insulating cross arm and transmission pole

Abstract

The present invention discloses an insulating crossarm and a transmission pole, and the insulating crossarm is an integrated structure. The insulating crossarm includes an intermediate connection portion and two crossarm side arms, the two crossarm side arms are horizontally and symmetrically arranged on both sides of the intermediate connection portion, and the cross section of the crossarm side arm is an I-shaped, and the height of the cross section gradually decreases from the intermediate connection portion to the direction away from the intermediate connection portion. The insulating crossarm of the present invention has a simple structure, high mechanical strength, high production efficiency, and eliminates hardware, so that the insulating crossarm has the advantages of light weight, low cost, and easy installation. The insulating crossarm is suitable for a variety of poles and has universality.

Description

Technical Field

[0001] The invention relates to the field of power transmission insulation equipment, and more specifically to an insulating cross arm and a power transmission pole. Background Art

[0002] In the field of power equipment, the insulated crossarms used in transmission lines are important supporting structural parts of transmission poles, used to support conductors, lightning arresters, etc., and to keep them at a certain safety distance as required. Currently, most of the widely used metal crossarms in transmission lines with voltage levels of 35kV and below are iron crossarms. Metal crossarms are heavy, have poor insulation, and are prone to flashover problems.

[0003] In order to solve the above problems of metal crossarms, a composite crossarm has been developed. However, most of the existing composite crossarms use pultruded core rods as the main load-bearing material, and the two ends and the middle of the crossarm are crimped or glued with hardware to fix the poles and install the conductors. High-temperature vulcanized silicone rubber is used as the external insulating material, which needs to be formed by injection molding. The hardware and silicone rubber umbrella skirts greatly increase the weight of the crossarm, increase the production process, reduce production efficiency, and increase costs. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide an insulating crossarm and a transmission pole to solve the problems of complex production process and low efficiency of the existing composite crossarm, and the need for additional assembly hardware when fixing the composite crossarm to the pole body of the transmission pole, which increases the overall weight of the crossarm and increases the cost.

[0005] In order to achieve the above-mentioned purpose of the invention, the technical means adopted by the present invention are as follows: an insulating crossarm, which is an integrated structure, including a middle connecting part and two crossarm side arms, the two crossarm side arms are horizontally symmetrically located on both sides of the middle connecting part, the cross-section of the crossarm side arm is I-shaped, and the height of the cross-section gradually decreases along the middle connecting part to the direction away from the middle connecting part.

[0006] On the one hand, the above-mentioned insulating crossarm is connected to the transmission pole through an intermediate connecting part, and is used to hang or tie the transmission wire through two symmetrically arranged crossarm side arms, and the cross-section of the crossarm side arm is I-shaped. From the perspective of mechanical properties, the I-shaped structure is better than the rectangular, circular and T-shaped structures. The reduction in the cross-sectional height of the crossarm side arm is to reduce the weight of the insulating crossarm, as well as to save materials and reduce costs to a greater extent.

[0007] On the other hand, the above-mentioned insulating crossarm adopts an integrally formed structure, which greatly reduces the molding process of the existing composite crossarm, reduces labor and energy consumption, and at the same time eliminates hardware, reduces the overall weight of the insulating crossarm, and greatly reduces costs.

[0008] Preferably, the insulating cross arm is integrally molded, which is a simple process and has strong designability for the molded product.

[0009] Preferably, the above-mentioned intermediate connecting part includes a main body and a pad arranged on one side of the main body, and the main body is provided with two mounting holes located on both sides of the above-mentioned pad for connecting with the transmission pole, and the shape of the pad can be designed according to the shape of the transmission pole, so that the insulating crossarm is more versatile and flexible.

[0010] Preferably, a first groove is provided on one side surface of the main body, and the pad is located in the first groove. The setting of the groove further reduces the weight of the insulating crossarm and reduces the cost. At the same time, the setting of the pad can also serve as a reinforcing rib to ensure the mechanical strength of the insulating crossarm.

[0011] Preferably, a plurality of the above-mentioned pads are arranged at intervals in the vertical direction, which can save costs to a greater extent compared with an integrated pad design.

[0012] Preferably, the main body further comprises a second groove arranged on the other side of the main body to further reduce the cost. Meanwhile, at least one reinforcing rib is arranged in the second groove. The arrangement of the reinforcing rib ensures the overall mechanical strength of the insulating cross arm.

[0013] Preferably, the upper surface of the cross arm side arm is located in a horizontal plane, a top phase platform is arranged in the second groove, the upper surface of the top phase platform and the upper surface of the cross arm side arm are located in the same plane, and a top phase hole is provided on the top phase platform for connecting the top phase insulator.

[0014] Preferably, the insulating cross arm comprises a wire hanging portion arranged at the ends of two cross arm side arms, and the wire hanging portion is provided with a third groove for hanging or binding the transmission wire.

[0015] Preferably, the insulating cross arm is provided with an anti-aging coating on the outside to ensure the service life of the insulating cross arm.

[0016] In order to achieve the above-mentioned purpose, another technical solution adopted by the present invention is as follows: a transmission pole is provided, comprising a pole body and the above-mentioned insulating cross arm fixed on the pole body.

[0017] Preferably, a mounting hole is provided on the main body, and the transmission pole includes a pole fixing member, namely a U-shaped clamp and a fastener, and the pole fixing member fixes the insulating cross arm to the pole body through the mounting hole, thereby ensuring a stable connection between the insulating cross arm and the transmission pole and facilitating installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of an insulating cross arm 10 according to a first embodiment of the present invention;

[0019] Figure 2 is a schematic structural diagram of the intermediate connecting portion 11 of the first embodiment of the present invention;

[0020] Figure 3 is a schematic structural diagram of an insulating cross arm 20 according to a second embodiment of the present invention;

[0021] Figure 4 is a schematic structural diagram of a transmission pole 01 according to a third embodiment of the present invention;

[0022] Figure 5 It is a schematic diagram of the structure of the transmission pole 02 of the fourth embodiment of the present invention. DETAILED DESCRIPTION

[0023] Upon request, specific embodiments of the present invention will be disclosed herein. However, it should be understood that the embodiments disclosed herein are merely typical examples of the present invention, which may be embodied in various forms. Therefore, the specific details disclosed herein are not to be considered restrictive, but merely as a basis for the claims and as a representative basis for teaching those skilled in the art to apply the present invention in various ways in any appropriate manner in practice, including using the various features disclosed herein and in combination with features that may not be explicitly disclosed herein.

[0024] Embodiment 1:

[0025] like Figure 1 As shown, this embodiment provides an insulating crossarm 10, which includes an intermediate connecting portion 11 and two crossarm side arms 12. The intermediate connecting portion 11 and the two crossarm side arms 12 are an integral structure, and the two crossarm side arms 12 are horizontally symmetrically located on both sides of the intermediate connecting portion 11. The integral structure is integrally molded, and the molded filler is placed in the mold, and is molded by heating and curing. Any complex structure can be molded at one time, with a simple process, high efficiency, and strong designability. At the same time, the integrally molded insulating crossarm 10 replaces the assembly of the core rod and hardware of the existing composite crossarm, with a single process and simple operation, which greatly reduces labor and energy consumption, improves production efficiency, and reduces the weight of the insulating crossarm 10. In addition, the cost of raw materials using this process method is also low, which further reduces the cost.

[0026] like Figure 1 and Figure 2As shown, the middle connecting part 11 includes a main body 111 and a pad 112. The pad 112 is located on a side surface 111a of the main body 111, and two through holes are provided on the main body 111, namely two mounting holes 1111, which are symmetrically located on both sides of the pad 112 for connecting with the transmission pole. No additional hardware is required on the main body 111 for fixed connection with the transmission pole, and installation is convenient. The shape of the pad 112 can be designed according to the shape of the transmission pole. In this embodiment, the insulating cross arm 10 is used for the transmission pole of a circular cylinder, and the pad 112 is designed to be a corresponding arc structure. In some other embodiments, the insulating cross arm is used for the transmission pole of a diamond column, and the pad is designed to be a corresponding diamond structure. Other shapes are not described here one by one.

[0027] A first groove 1112 is also provided on one side surface 111a of the main body 111, which further reduces the weight of the insulating cross arm 10 and reduces the cost. The pad 112 is located in the first groove 1112, and the setting of the pad 112 also plays the role of a reinforcing rib to ensure the mechanical strength of the insulating cross arm 10. In this embodiment, three pads 112 are evenly spaced in the vertical direction, namely pads 112a, pads 112b, and pads 112c, and the upper surface 112a1 of the top pad 112a and the upper surface 111c of the main body 111 are located in the same plane, and the lower surface 112c1 of the bottom pad 112c and the lower surface 111d of the main body 111 are located in the same plane, which further reduces the weight of the insulating cross arm 10 and saves costs. In some other embodiments, the pads can be spaced to be two or four, and the upper surface of the pads can also be not in the same plane as the upper surface of the main body, which will not be repeated here.

[0028] like Figure 1 As shown, the cross section 121 of the cross arm side arm 12 is designed to be I-shaped. The I-shaped cross section has the best stress characteristics, which is beneficial to enhancing the mechanical properties of the insulating cross arm 10. The reasons for selecting the I-shaped cross section are as follows:

[0029] It is known from common sense of mechanics that the bending section coefficient and torsional section coefficient of a part are quantities that are only related to the shape and size of the cross section. Therefore, in order to compare the stress characteristics of different cross-sectional shapes, the rectangular cross section, circular cross section, T-shaped cross section, and I-shaped cross section are compared. For ease of comparison, their cross-sectional areas are set to be approximately equal. In this case, the bending section coefficient and torsional section coefficient are calculated separately. As shown in Table 1:

[0030] Table 1

[0031]

[0032]

[0033] As can be seen from Table 1 above, the I-shaped cross section has the strongest torsion and bending resistance, so the I-shaped cross section is preferably used as the shape of the cross section 121 of this embodiment, so that the insulating cross arm 10 can withstand bending and twisting to a greater extent, thereby improving the service life of the insulating cross arm 10. Moreover, the height of the cross section 121 gradually decreases from the middle connection portion 11 to the direction away from the middle connection portion 11, further reducing the weight of the insulating cross arm 10, saving materials and reducing costs. At the same time, the ends of the two cross arm side arms 12 are provided with a hanging part 122. In this embodiment, a third groove 1221 is provided at the upper end of the hanging part 122 for hanging or tying the transmission wire. In some other embodiments, the third groove on the hanging part can also be provided to include grooves at the front, rear and side for tying the transmission wire, thereby ensuring that the transmission wire can be firmly and conveniently fixed on the insulating cross arm 10.

[0034] like Figure 1 As shown, the main body 11 further includes a second groove 1113 disposed on the other side surface 111b of the main body, and at least one reinforcing rib 1114 is disposed in the second groove 1113 to ensure the overall mechanical strength of the insulating cross arm 10. At the same time, the outer surface of the insulating cross arm 10 is provided with an anti-aging coating 13. In this embodiment, the anti-aging coating 13 is sprayed fluorocarbon paint. In some other embodiments, the anti-aging coating can also be an injection or molded silicone rubber shed.

[0035] The insulating cross arm 10 of this embodiment is provided with a first groove 1112 and a second groove 1113, and a plurality of spacers 112 are arranged in parallel. In some other embodiments, the first groove and the second groove may not be provided, and only one spacer may be provided, and the height of the spacer is set according to the actual working conditions.

[0036] The insulating crossarm 10 of the present embodiment is used for supporting the conductors of a double-circuit power transmission line. Three insulating crossarms 10 are sufficient to be installed at the same time. The insulating crossarm 10 is formed in one step by integral molding, which has a simple process, reduces labor and energy consumption, and has high efficiency, thereby reducing costs. At the same time, additional hardware is eliminated, and installation is convenient. The insulating crossarm 10 is light in overall weight and high in mechanical strength, and is suitable for a variety of poles.

[0037] Embodiment 2:

[0038] like Figure 3As shown, the insulating cross arm 20 of this embodiment is similar in structure to the insulating cross arm 10 of the first embodiment, except that the insulating cross arm 20 further includes a top phase platform 213, and two mutually parallel support plates 214 are connected below the top phase platform 213. The support plate 214 is a right-angled triangular panel, and the two right-angled sides of the support plate 214 are respectively connected to the second groove 2113 and the end of the top phase platform 213, so as to support the top phase platform 213. The upper surface 22a of the cross arm side arm 22 is located in a horizontal plane, and the upper surface 213a of the top phase platform 213 and the upper surface 22a of the cross arm side arm 22 are located in the same plane. The top phase platform 213 is also provided with a top phase hole 2131, which is used to connect the top phase insulator to support the transmission line.

[0039] The insulating cross arm 20 of this embodiment is used for supporting the conductors of a single-circuit power transmission line. All components of the insulating cross arm 20 are also formed in one step by integral molding. Its function is the same as that of the first embodiment and will not be described in detail here.

[0040] Embodiment three:

[0041] like Figure 4 As shown, the transmission pole 01 of this embodiment includes the insulating cross arm 10 of the first embodiment, the pole body 011 and the pole body fixing piece 012, the pole body fixing piece 012 includes a U-shaped clamp 0121 and a fastener 0122, the fastener 0122 includes a matching nut and a flat washer, the U-shaped clamp 0121 and the fastener 0122 fix the insulating cross arm 10 on the pole body 011 through two mounting holes 1111 on the main body, and a metal insert (not shown in the figure) needs to be added in the mounting hole 1111. The main body of the metal insert is cylindrical, and its size matches the size of the mounting hole 1111 to ensure the accurate installation of the metal insert. The metal insert also includes a flange located at one end of the main body of the metal insert and forming an angle of 90° with the main body of the metal insert to prevent the pole body fixing piece 012 from causing wear on the outer surface of the main body 111, and also facilitate installation, thereby ensuring a stable connection between the insulating cross arm 10 and the transmission pole 01.

[0042] Embodiment 4:

[0043] like Figure 5 As shown, the transmission pole 02 of this embodiment is basically similar in structure to the transmission pole 01 in the third embodiment, and its functions are also basically the same. The difference is that the transmission pole 02 is suitable for an insulating cross arm 20, including a top phase platform 213 and a top phase hole (not shown in the figure), which is used to connect the top phase insulator 023. A metal insert (not shown in the figure) is also required to be added to the top phase hole. The metal insert is similar to the metal insert in the third embodiment to prevent the connection part of the top phase insulator 023 from causing wear on the outer surface of the top phase platform 213.

[0044] The technical content and technical features of the present invention have been disclosed above, but it is understood that under the creative ideas of the present invention, those skilled in the art can make various changes and improvements to the above structures and materials, including combinations of technical features disclosed or claimed separately herein, and obviously including other combinations of these features. These variations and / or combinations all fall within the technical field involved in the present invention and fall within the protection scope of the claims of the present invention.

Claims

1. An insulating cross arm, characterized in that: include: An intermediate connecting part, the intermediate connecting part comprises a main body and a cushion block arranged on one side of the main body, a first groove is arranged on one side of the main body, the cushion block is located in the first groove, and a plurality of cushion blocks are arranged at intervals in the vertical direction; and two cross arm side arms, the two cross arm side arms are horizontally symmetrically located on both sides of the middle connecting portion, the cross arm side arm has an I-shaped cross section, and the height of the cross section gradually decreases along the middle connecting portion to a direction away from the middle connecting portion, and a wire hanging portion is provided at both ends of the cross arm side arm, and a third groove is provided at the upper end of the wire hanging portion for hanging or tying the transmission wire; Wherein, the middle connecting portion and the two cross arm side arms are an integral structure.

2. The insulating cross arm according to claim 1, characterized in that: The insulating cross arm is integrally molded.

3. The insulating cross arm according to claim 1, characterized in that: The main body is provided with two mounting holes located on both sides of the cushion block.

4. The insulating cross arm according to claim 3, characterized in that: The main body further comprises a second groove arranged on the other side surface of the main body, and at least one reinforcing rib is arranged in the second groove.

5. The insulating cross arm according to claim 4, characterized in that: The upper surface of the cross arm side arm is located in a horizontal plane, a top phase platform is arranged in the second groove, the upper surface of the top phase platform and the upper surface of the cross arm side arm are located in the same plane, and a top phase hole is arranged on the top phase platform.

6. The insulating cross arm according to claim 1, characterized in that: The insulating cross arm is provided with an anti-aging coating on the outside.

7. A transmission pole, comprising a pole body and an insulating cross arm fixed to the pole body, characterized in that: The insulating cross arm adopts the insulating cross arm as described in any one of claims 1-6.

8. The transmission pole according to claim 7, characterized in that: The main body is provided with a mounting hole, the transmission pole comprises a pole body fixing part, the pole body fixing part comprises a U-shaped clamp and a fastener, and the pole body fixing part fixes the insulating cross arm on the pole body through the mounting hole.

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