Insulating cross arm, manufacturing method thereof, and transmission pole

Abstract

The present invention discloses an insulating crossarm, a preparation method thereof, and a transmission pole, comprising: an integrally cast connecting fitting, the connecting fitting comprising an intermediate connecting portion and two sleeves respectively arranged at both ends of the intermediate connecting portion; a core rod comprising a first core rod and a second core rod, one end of the first core rod and one end of the second core rod being fixedly connected to the two sleeves respectively; two hanging wire fittings, the two hanging wire fittings being respectively fixedly connected to the other end of the first core rod and the other end of the second core rod; an insulating layer, the insulating layer covering and fixed to the outer circumference of the core rod, the insulating layer being located in areas other than the connecting fitting and the hanging wire fitting, and the insulating layer and the connecting fitting, as well as the insulating layer and the hanging wire fitting, are all sealed. The insulating crossarm of the present invention has a simple structure, high mechanical strength, high production efficiency, and is easy to install. It is applicable to a variety of pole bodies and has versatility.

Description

Technical Field

[0001] The present invention relates to the field of power transmission insulation equipment, and more particularly to an insulating crossarm and a preparation method thereof, as well as a power transmission pole. Background Art

[0002] In the field of power equipment, insulated crossarms for transmission lines are crucial structural components supporting transmission poles, supporting conductors, lightning conductors, and other components while maintaining a prescribed safe distance. Currently, composite crossarms used in transmission lines with voltage levels of 35kV and below mostly utilize an integral crossarm with intermediate hardware. These composite crossarms utilize a continuous core rod, some with a hole punched in the middle for the pole connection clamp. Others, without a hole, require complex and bulky intermediate hardware, increasing the overall weight of the crossarm and requiring dual clamps for installation. Summary of the Invention

[0003] In view of the deficiencies in the prior art, the present invention aims to provide an insulating cross-arm, a preparation method thereof, and a transmission pole, which can reduce the weight of the insulating cross-arm while ensuring the mechanical strength of the insulating cross-arm, simplify its structure, and facilitate installation.

[0004] 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 includes: a connecting fitting, including an intermediate connecting part and two sleeves respectively arranged at both ends of the intermediate connecting part; a core rod, including a first core rod and a second core rod, one end of the first core rod and one end of the second core rod are respectively fixed in the two sleeves; two hanging wire fittings, respectively fixed to the other end of the first core rod and the other end of the second core rod; an insulating layer, covering and fixed on the outer circumference of the core rod, the insulating layer is located in other areas except the connecting fitting and the hanging wire fitting, and the insulating layer and the connecting fitting, as well as the insulating layer and the hanging wire fitting are all sealed.

[0005] The above-mentioned insulating crossarm uses two core rods as the main insulating load-bearing materials, namely the first core rod and the second core rod. A connecting hardware is used in the middle of the crossarm, and the left and right ends of the connecting hardware are respectively sleeved on the first core rod and the second core rod. There is no need to drill holes on the core rods or use a complex connecting device to connect to the pole body; both ends of the crossarm are sleeved with hanging hardware to fix the connecting wires, and the first core rod and the second core rod are covered with an insulating layer to protect the core rods and prevent them from aging.

[0006] Preferably, the connecting hardware is an integrated casting hardware with a simple structure and easy installation.

[0007] Preferably, a pad is provided on one side surface of the middle connecting portion, and the pad has an arc-shaped surface recessed toward the inner side of the middle connecting portion, for being connected with the rod body.

[0008] Preferably, the middle connecting part is a plate, and the two sleeves extend outwards from both ends of the middle connecting part along the axis direction of the insulating cross arm respectively. The two sleeves are hollow structures and are used to sleeve the first core rod and the second core rod.

[0009] Preferably, in a direction perpendicular to the vertical plane where the axis of the insulating cross-arm is located, the width of the intermediate connecting portion is smaller than the width of the sleeve, so as to reduce the weight of the entire cross-arm and reduce the cost.

[0010] Preferably, at least two mounting holes are provided on the middle connecting portion along the axis direction of the insulating cross arm, for passing the rod connecting piece to fix the cross arm to the rod body.

[0011] Preferably, a top phase platform is provided at the upper end of the middle connecting portion, and a top phase hole is provided on the top phase platform for connecting a top phase insulator.

[0012] Preferably, the sleeve includes a sleeve body and a flange arranged around the sleeve body and connected to the sleeve body, and the insulating layer is covered on the flange and part of the outer wall of the sleeve body to ensure the sealing performance between the insulating layer and the connecting hardware.

[0013] Preferably, a lightening hole is provided on the middle connecting portion to further reduce the weight of the entire cross arm and reduce costs. Reinforcing ribs are provided in the lightening hole in a direction perpendicular to the axis of the insulating cross arm to ensure the mechanical strength of the middle connecting portion.

[0014] To achieve the above object, another technical solution adopted by the present invention is as follows: providing a method for preparing an insulating crossarm, comprising the following steps:

[0015] Forming a first core rod, a second core rod, a connecting hardware and two hanging hardware;

[0016] One end of the first mandrel and one end of the second mandrel are fixedly connected to the connecting hardware, and the other end of the first mandrel and the other end of the second mandrel are respectively fixedly connected to two hanging hardware to form a part to be covered;

[0017] The insulating layer is entirely coated on the part to be coated, and the insulating layer covers the other areas of the first core rod and the second core rod except the connecting hardware and the hanging hardware to obtain an insulating cross arm.

[0018] To achieve the above object, another technical solution adopted by the present invention is as follows: providing another method for preparing an insulating crossarm, comprising the following steps:

[0019] Forming a core rod preform, connecting hardware, two hanging hardware and several insulating sheds;

[0020] Uniformly covering the outer surface of the core rod preform with an insulating sheath, and cutting the core rod preform into a first core rod and a second core rod;

[0021] A plurality of insulating sheds are fixed to the insulating sheaths of the first core rod and the second core rod respectively to form an insulating layer;

[0022] One end of the first core rod and one end of the second core rod are fixedly connected to the connecting hardware, and the other end of the first core rod and the other end of the second core rod are respectively fixedly connected to two hanging hardware to obtain an insulating cross arm.

[0023] To achieve the above object, another technical solution adopted by the present invention is as follows: a transmission pole is provided, comprising a pole body and an insulating cross arm fixed to the pole body, wherein the insulating cross arm adopts any of the above insulating cross arms.

[0024] Preferably, the insulating crossarm includes a connecting hardware with at least two mounting holes provided on the connecting hardware along the axis direction of the insulating crossarm. The transmission pole includes a pole fixing piece, which cooperates with the mounting holes to fix the insulating crossarm on the pole body.

[0025] The beneficial effects of the present application are: different from the prior art, by fixing the first core rod and the second core rod at both ends of the connecting hardware respectively, the core rod of the cross arm is divided into two parts, thereby a mounting hole can be directly opened on the connecting hardware, and a rod body connector is inserted into the mounting hole to connect the cross arm to the rod body, and no more than two rod body connectors are required. The connecting hardware is an integrated casting hardware with a simple structure and easy installation. At the same time, the cross arm core rod is covered with an insulating layer except for the connecting hardware and the end hanging wire hardware to protect the core rod and prevent it from aging. The overall manufacturing process of the insulating cross arm product is simple, with high production efficiency and low cost. The integral injection makes the product have better sealing performance, and fewer processes can reduce labor costs and energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 1 is a schematic structural diagram of the insulating cross arm 10 according to the first embodiment of the present invention;

[0027] Figure 2 yes Figure 1 Schematic diagram of the enlarged structure of part A;

[0028] Figure 3 This is a schematic structural diagram of the connecting fitting 110 according to the first embodiment of the present invention;

[0029] Figure 4 2 is a structural diagram of the insulating cross arm 20 according to the second embodiment of the present invention;

[0030] Figure 5 This is a structural diagram of a connecting fitting 210 according to a second embodiment of the present invention;

[0031] Figure 6 Schematic diagram of the structure of the transmission pole 01 according to the fifth embodiment of the present invention;

[0032] Figure 7 It is a structural diagram of the transmission pole 02 of the sixth embodiment of the present invention. DETAILED DESCRIPTION

[0033] Upon request, specific embodiments of the present invention will be disclosed herein. However, it should be understood that the embodiments disclosed herein are merely exemplary of the present invention, which may be embodied in various forms. Therefore, the specific details disclosed herein are not to be construed as limiting, but merely as a basis for the claims and as a representative basis for teaching those skilled in the art to variously apply the present invention in any appropriate manner, including employing the various features disclosed herein in combination with features that may not be explicitly disclosed herein.

[0034] Unless otherwise expressly specified or limited, the term "connection" as used herein should be understood in a broad sense, and may refer to direct connection or connection through an intermediate medium. In the description of the present invention, it should be understood that the orientations or positional relationships indicated by terms such as "upper," "lower," "end," and "one end" are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0035] Example 1:

[0036] like Figure 1 and Figure 2 As shown, the insulating crossarm 10 includes a connecting fitting 110, a core rod 120, an insulating layer 130, and two hanging fittings 140. The core rod 120 includes a first core rod 121 and a second core rod 122. One end of the first core rod 121 and one end of the second core rod 122 are respectively fixedly connected to the two ends of the connecting fitting 110, while the other ends of the first core rod 121 and the other ends of the second core rod 122 are respectively fixedly connected to the two hanging fittings 140. The core rod 120 is covered with an insulating layer 130. The insulating layer 130 is located in all areas except the connecting fitting 110 and the hanging fittings 140. The insulating layer 130 and the connecting fitting 110, as well as the insulating layer 130 and the hanging fittings 140, are sealed to protect the core rod 120 and prevent it from aging.

[0037] The core rod 120 is made of a composite material, such as glass fiber or aramid fiber impregnated with resin and then pultruded. Composite materials are more corrosion-resistant and cost-effective than the metal materials used in traditional crossarms, reducing the weight of the insulating crossarm 10. The cross-section of the core rod 120 can be square, circular, T-shaped, or I-shaped. The insulating layer 130 is coated on the core rod 120. The insulating layer 130 is made of silicone rubber material, and the silicone rubber material is integrally coated around the outer periphery of the core rod 120 by a method of integral injection molding, which is cost-effective and highly efficient. Alternatively, the coating method can be molded to form a single silicone rubber insulating layer. Silicone rubber also has excellent aging resistance and hydrophobic migration properties, which can reduce the probability of pollution flashover and rain flashover. Of course, the insulating layer 130 can also be made of other rubber materials. In this embodiment, the insulating layer 130 also includes a sheath and shed skirts spaced apart from the sheath. The upper and lower surfaces of the insulating layer 130 are both arc-shaped. When rain falls on the insulating layer 130, it falls along the curved silicone rubber surface, facilitating drainage and preventing water accumulation on the insulating layer 130, which could affect electrical performance. Furthermore, the upper and lower surfaces of the insulating layer 130 covering the outer periphery of the first core rod 121 are symmetrically provided with two grooves 131 along the axis of the insulating crossarm 10 (only the upper groove 131 is shown in the figure). The surfaces of the grooves 131 are flat, facilitating the installation of jumper insulators (not shown in the figure). The provision of the grooves 131 also serves as a marker, reminding installers that they can be installed in the grooves 131. Similarly, the upper and lower surfaces of the insulating layer 130 covering the outer periphery of the second core rod 122 are symmetrically provided with two grooves 131 along the axis of the insulating crossarm 10. Preferably, the groove 131 on the insulating layer 130 of the first core rod 121 and the groove 131 on the insulating layer 130 of the second core rod 122 are symmetrically arranged on either side of the connecting fitting 110. The wire hanging fitting 140 is used to secure the wires. The wires can be secured to the wire hanging fitting 140 through a bundling process, or a gland can be provided to secure the wires. The specific structure of the wire hanging fitting 140 is not limited herein. Furthermore, the materials of the connecting fitting 110 and the wire hanging fitting 140 can both be metal or composite materials. The metal materials can be iron, steel, aluminum, or other metals.

[0038] Specifically, if Figure 1 and Figure 3As shown, the connecting hardware 110 is an integral casting hardware with a simple overall structure and an easy molding method. It can be molded in one go for any complex structure, with a simple process, high efficiency, and strong designability. The connecting hardware 110 includes an intermediate connecting portion 111 and two sleeves 112 respectively arranged at both ends of the intermediate connecting portion 111. The intermediate connecting portion 111 is a plate. The two sleeves 112 extend outward from both ends of the intermediate connecting portion 111 along the axis of the insulating crossarm 10, that is, the intermediate connecting portion 111 and the sleeve 112 are integrally molded, and both sleeves 112 are hollow structures. One end of the first core rod 121 and one end of the second core rod 122 are respectively located in the cavities of the two sleeves 112. The core rod 120 and the sleeve 112 are then fixed by crimping. Of course, they can also be fixed by gluing, as long as a firm connection between the core rod 120 and the sleeve 112 can be achieved. The cavity of the sleeve 112 can be of any shape, such as square, circular, T-shaped or I-shaped, as long as it is consistent with the cross-sectional shape of the core rod 120. This can maximize the contact area between the core rod 120 and the sleeve 112, making the connection more stable and improving the mechanical properties of the insulating crossarm 10.

[0039] Furthermore, a pad 113 is provided on one side of the intermediate connecting portion 111, that is, the pad 113 extends outward from one side of the intermediate connecting portion 111, and the upper end surface of the pad 113 is located in the same plane as the upper end surface of the intermediate connecting portion 111, and the lower end surface of the pad 113 is located in the same plane as the lower end surface of the intermediate connecting portion 111, so that the connecting hardware 110 maintains an appropriate contact area when connected to the rod body, thereby making the connection between the insulating cross arm 10 and the rod body more stable. The pad 113 has an arc-shaped surface that is recessed toward the inner side of the intermediate connecting portion 111, which is used to cooperate with the rod body to make the connection more stable and reliable. In this embodiment, the recessed surface of the pad 113 is arc-shaped. In other embodiments, the recessed surface of the pad 113 can also be triangular or rectangular, as long as it can match the rod body of the corresponding shape. Two first mounting holes 115 are provided on the middle connecting portion 111 along the axial direction of the insulating crossarm 10. The two first mounting holes 115 are located at both ends of the middle connecting portion 111 and on both sides of the pad 113, that is, the pad 113 is located between the two first mounting holes 115, which are used to pass the rod body connector and facilitate the installation operation. The rod body connector is generally a combination of a clamp and a nut, which fixes the insulating crossarm 10 to the rod body.

[0040] In this embodiment, a top-phase platform 114 is provided at the upper end of the intermediate connecting portion 111. The top-phase platform 114 is an arc-shaped plate. Specifically, the top-phase platform 114 is vertically provided on the other side of the intermediate connecting portion 111, that is, the back side of one side of the intermediate connecting portion 111 where the pad 113 is located, and the top-phase platform 114 is also located between the two first mounting holes 115. The upper end surface of the top-phase platform 114 is located in the same plane as the upper end surface of the intermediate connecting portion 111. Of course, the upper end surface of the top-phase platform 114 may not be located in the same plane as the upper end surface of the intermediate connecting portion 111, as long as the top-phase platform 114 is firmly provided on the intermediate connecting portion 111. A top-phase hole 116 is also provided on the top-phase platform 114 for connecting a top-phase insulator to adapt to the conductor support of a single-circuit transmission line. Of course, the top-phase platform 114 may also be a rectangular plate, a semicircular plate, or a plate of any other shape. In other embodiments, the top phase platform may not be provided on the middle connecting portion 111, and it can be used for supporting the conductors of a double-circuit transmission line. In this case, three insulating cross arms 10 can be installed on the transmission pole at the same time; of course, it can also be used for supporting the conductors of a single-circuit transmission line. In this case, two insulating cross arms are installed on the transmission pole, one of which uses an insulating cross arm 10, and the other is connected to the first core rod 121 and the hanging wire fitting 140 only on one side of the connecting hardware 110.

[0041] Furthermore, in a direction perpendicular to the vertical plane of the axis of the insulating crossarm 10, the width of the intermediate connecting portion 111 is smaller than the width of the sleeve 112. Specifically, on the side of the intermediate connecting portion 111 where the spacer 113 is located, the portions on both sides of the spacer 113 are recessed toward the inside of the intermediate connecting portion 111, forming a groove. On the side of the intermediate connecting portion 111 where the top phase platform 114 is located, the portion between the two first mounting holes 115 is recessed toward the inside of the intermediate connecting portion 111, forming a groove. This reduces the weight of the insulating crossarm 10 and reduces costs. Furthermore, the groove is only provided on one side of the intermediate connecting portion 111 where the first mounting holes 115 are located to ensure the mechanical strength of the connecting hardware 110 and prevent damage to the connecting hardware 110 during operation.

[0042] Furthermore, the sleeve 112 includes a sleeve body 117 and a flange 118 disposed around and connected to the sleeve body 117. The insulating layer 130 covers the flange 118 and a portion of the outer wall of the sleeve body 117 to ensure a sealed connection between the insulating layer 130 and the connecting fitting 110. Specifically, when the core rod 120 is sleeved with the connecting fitting 110, a gap is formed between the flange 118 and the core rod 120. When the insulating layer 130 covers the insulating crossarm 10, the gap is filled, and the insulating layer 130 may even cover a portion of the outer wall of the sleeve body 117, thereby better ensuring a sealed interface between the connecting fitting 110 and the core rod 120, preventing moisture from entering the core rod 120 and corroding the core rod 120, thereby avoiding degradation of the mechanical and electrical properties of the core rod 120.

[0043] The connection method between the wire hanging fitting 140 and the core rod 120 is consistent with the connection method between the connecting fitting 110 and the core rod 120, and will not be repeated here. The end of the wire hanging fitting 140 also includes a sleeve body and a flange (not shown in the figure) arranged around the sleeve body and connected to the sleeve body, so that the insulating layer 130 is covered at the connection interface between the core rod 120 and the wire hanging fitting 140, ensuring the sealing between the core rod 120 and the wire hanging fitting 140, preventing water vapor from entering the core rod 120 and corroding the core rod 120, thereby avoiding reducing the mechanical and electrical properties of the core rod 120.

[0044] The insulating crossarm 10 provided in this embodiment uses two core rods as the main insulating load-bearing materials, namely the first core rod 121 and the second core rod 122. A connecting hardware 110 is used in the middle of the insulating crossarm 10. The left and right ends of the connecting hardware 110 are respectively sleeved with the first core rod 121 and the second core rod 122. Therefore, a mounting hole can be directly opened on the connecting hardware 110 without drilling holes on the core rod 120 or using a complex connecting device. It can be connected to the rod body and does not require more than two rod body connectors, which simplifies the installation process of the insulating crossarm 10 and improves work efficiency. The connecting hardware 110 is an integrated casting hardware with a simple structure and a relatively easy molding method. It can be molded in one go for any complex structure. It has a simple process, high efficiency, and strong designability. At the same time, both ends of the insulating crossarm 10 are sleeved with a wire hanging hardware 140 to fix the connecting wire. The portion of the insulating crossarm 10 other than the connecting hardware 110 and the end wire hanging hardware 140 is covered with an insulating layer 130 to protect the core rod 120 and prevent it from aging. Compared with the prior art, the insulating cross arm 10 uses less material, has a simple process, reduces costs, and is applicable to a variety of poles.

[0045] Example 2:

[0046] like Figure 4 As shown, the insulating crossarm 20 of this embodiment is similar in structure to the insulating crossarm 10 of Example 1, except that four first mounting holes 215 are symmetrically provided on the middle connecting portion 211 of the connecting fitting 210 of the insulating crossarm 20 along the axis of the insulating crossarm 20, that is, the four first mounting holes 215 are distributed in a rectangular shape, that is, the four first mounting holes 215 are respectively located at the four top corners of the middle connecting portion 211, so that the insulating crossarm 20 is fixedly connected to the rod body through two rod body connectors. This method can make the connection of the insulating crossarm 20 more stable and have higher mechanical strength.

[0047] Furthermore, a lightening hole 219 is provided on the intermediate connection portion 211 to further reduce the overall weight of the insulating crossarm 20 while reducing costs. A reinforcing rib 223 is also provided in the lightening hole 219. The reinforcing rib 223 can be provided perpendicular to the axial direction of the insulating crossarm 20 or along the axial direction of the insulating crossarm 20 to ensure the mechanical strength of the intermediate connection portion 211 and prevent the connection hardware 210 from being damaged during operation. Of course, the preferred solution is to provide the reinforcing rib 223 perpendicular to the axial direction of the insulating crossarm 20. One or more reinforcing ribs 223 can be provided, and they can be designed according to the size of the lightening hole 219, as long as the mechanical strength of the intermediate connection portion 211 is ensured. Preferably, four first mounting holes 215 are provided on the periphery of the lightening hole 219, so that the connection hardware 210 can reduce weight while ensuring mechanical strength.

[0048] Combine Figure 5 As shown, since the lightening hole 219 is provided on the intermediate connecting part 211, the pad 213 includes two, namely the first pad 224 and the second pad 225. The first pad 224 is located at the upper end of the intermediate connecting part 211, and the second pad 225 is located at the lower end of the intermediate connecting part 211, that is, the upper end surface of the first pad 224 and the upper end surface of the intermediate connecting part 211 are located in the same plane, and the lower end surface of the second pad 225 and the lower end surface of the intermediate connecting part 211 are located in the same plane, which further reduces the overall weight of the insulating cross arm 20 and reduces the cost. The lower end surface of the first pad 224 is flush with the upper inner wall of the lightening hole 219, and the upper end surface of the second pad 225 is flush with the lower inner wall of the lightening hole 219, which reduces the overall weight of the insulating crossarm 20 to the greatest extent, reduces the cost, ensures the mechanical strength between the pad 213 and the middle connecting part 211, and also ensures the contact area between the connecting hardware 110 and the rod body, so that the connecting hardware 110 is firmly connected to the rod body.

[0049] The insulating crossarm 20 provided in this embodiment has similar beneficial effects to the insulating crossarm 10 of the first embodiment, and will not be further elaborated here. Furthermore, the insulating crossarm 20 is connected to the rod body using two rod connectors, which increases the overall mechanical strength of the insulating crossarm 20 and makes the connection more stable. Furthermore, the provision of the lightening hole 219 minimizes material usage, thereby reducing costs.

[0050] Example 3:

[0051] Combine Figure 1 As shown, this embodiment provides a method for preparing an insulating crossarm 10, comprising the following steps:

[0052] S101 : forming a first core rod 121 , a second core rod 122 , a connection fitting 110 and two hanging fittings 140 .

[0053] Glass fiber is impregnated with epoxy resin and formed into the first and second core rods 121, 122 by pultrusion. Molding or other forming methods are also possible, but pultrusion is preferred. Pultruded core rods offer superior mechanical and electrical properties at a low cost. The first and second core rods 121, 122 can be round, square, T-shaped, or I-shaped.

[0054] The connecting fitting 110 and the two hanging wire fittings 140 are cast in one step. When the material of the connecting fitting 110 and the hanging wire fitting 140 is cast iron, they need to be hot-dip galvanized to prevent corrosion of the fittings and extend their service life. When the material of the connecting fitting 110 and the hanging wire fitting 140 is cast aluminum, this operation is not required. Of course, the connecting fitting 110 can also be formed by a forging process, which is not limited here. The connecting fitting 110 and the hanging wire fitting 140 formed by a one-time casting method have a simple overall structure and an easier molding method. They can be molded in one step for any complex structure, with a simple process, high efficiency, and strong designability.

[0055] S102: One end of the first mandrel 121 and one end of the second mandrel 122 are fixedly connected to the connecting hardware 110, and the other end of the first mandrel 121 and the other end of the second mandrel 122 are fixedly connected to two hanging hardware 140 respectively to form a part to be covered.

[0056] The first mandrel 121 and the second mandrel 122 are fixedly connected to the connecting fitting 110 and the wire hanging fitting 140 by crimping, which provides a reliable connection, a simple process, high production efficiency, and low cost. To further ensure the interface seal between the first mandrel 121 and the second mandrel 122 and the connecting fitting 110 and the wire hanging fitting 140, sealing rings can be placed at the ends of the first mandrel 121 and the second mandrel 122 before crimping them to the connecting fitting 110 and the wire hanging fitting 140 respectively.

[0057] In this embodiment, the first core rod 121 and the second core rod 122 are fixed to the connecting hardware 110 and the hanging wire hardware 140 by crimping. In other embodiments, the first core rod 121 and the second core rod 122 can also be fixed to the connecting hardware 110 and the hanging wire hardware 140 by gluing. Specifically, when gluing is used, glue is applied to the cavity of the sleeve 112 of the connecting hardware 110, and then it is fastened to one end of the first core rod 121 and one end of the second core rod 122. One end of the hanging wire hardware 140 also has a sleeve. Glue is applied to the cavity of the inner wall of the sleeve at the end of the two hanging wire hardware 140, and then it is fastened to the other end of the first core rod 121 and the other end of the second core rod 122 respectively. The first core rod 121 and the second core rod 122 are fixedly connected to the connecting hardware 110 and the two hanging wire hardware 140 respectively by curing. Alternatively, after the connecting hardware 110 is buckled onto one end of the first core rod 121 and one end of the second core rod 122, a glue injection hole is set at the end of the connecting hardware 110 to inject glue, and finally the first core rod 121, the second core rod 122 and the connecting hardware 110 are fixedly connected by curing. The connection of the hanging hardware 140 is also carried out in the same way, which will not be repeated here.

[0058] S103 : The insulating layer 130 is entirely coated on the component to be coated. The insulating layer 130 covers the first core rod 121 and the second core rod 122 except for the connecting hardware 110 and the hanging hardware 140 to obtain the insulating cross arm 10 .

[0059] The insulating layer 130 is preferably made of silicone rubber material, which has good aging resistance and hydrophobic migration, and can significantly prevent the occurrence of pollution flashover and rain flashover. Of course, the insulating layer 130 can also be made of other forms of rubber materials. The coating method adopts an integral injection process, which is low in cost and high in efficiency. Before the integral injection of the insulating layer 130, a coupling agent is coated on the first core rod 121 and the second core rod 122 to make the silicone rubber and the first core rod 121 and the second core rod 122 have better adhesion performance. And because the integral injection process is adopted, the insulating layer 130 naturally forms a sealed connection with the connecting hardware 110 and the hanging wire hardware 140 after injection molding. Of course, the coating method can also adopt a molding process to form a silicone rubber insulating layer as a whole.

[0060] The method for manufacturing the insulating crossarm 10 provided in this embodiment can also be used to manufacture the insulating crossarm 20. The overall process involves fewer steps, is simple, and features low costs for pultrusion and one-time crimping, reducing labor costs and energy consumption. The integral injection molding process improves product sealing performance, while the silicone rubber insulation layer 130 provides the insulating crossarm 10 with enhanced external insulation and aging resistance.

[0061] Example 4:

[0062] Combine Figure 1 As shown, this embodiment provides another method for preparing an insulating crossarm 10, comprising the following steps:

[0063] S201: forming a core rod preform, a connecting fitting 110, two hanging fittings 140 and a plurality of insulating sheds.

[0064] The forming method of the core rod preform, the connecting hardware 110 and the two hanging wire hardware 140 is similar to step S101 of the third embodiment and will not be repeated here. In this embodiment, the core rod preform is a long product to be cut for use.

[0065] The insulating sheds can be silicone rubber sheds or sheds made of other rubber materials. In this embodiment, high temperature vulcanization is used to form a plurality of single-piece silicone rubber insulating sheds.

[0066] S202: Uniformly covering the outer surface of the core rod preform with an insulating sheath of equal thickness, cutting the core rod preform to form a first core rod 121 and a second core rod 122 covered with the insulating sheath, uniformly applying glue to the inner cavities of several single-piece insulating sheds, and then putting the insulating sheds onto the insulating sheaths of the first core rod 121 and the second core rod 122 in a certain arrangement order. The insulating sheath and the insulating sheds together form an insulating layer 130.

[0067] An insulating sheath is extruded onto the outer surface of the core rod preform. In this embodiment, the insulating sheath is a silicone rubber sheath, but in other embodiments, it can also be a sheath made of other rubber materials. After the insulating sheath is applied, the first core rod 121 and the second core rod 122 are cut to the required length.

[0068] The single piece of silicone rubber shed is coated with glue, i.e. adhesive, and then passed through the through hole in the middle of the silicone rubber shed to be fixed on the silicone rubber sheath to form a continuous silicone rubber shed.

[0069] S203 : One end of the first core rod 121 and one end of the second core rod 122 are fixedly connected to the connection hardware 110 , and the other end of the first core rod 121 and the other end of the second core rod 122 are fixedly connected to two hanging hardware 140 respectively to obtain the insulating cross arm 10 .

[0070] Specifically, the ends of the first core rod 121 and the second core rod 122 coated with the insulating layer 130 are trimmed and fixedly connected to the connecting hardware 110 and the hanging hardware 140 respectively. The fixing method is similar to step S102 of Example 3 and will not be repeated here.

[0071] S204 : performing sealing on the interfaces between the first core rod 121 , the second core rod 122 and the connection fitting 110 and the wire hanging fitting 140 .

[0072] The above-mentioned interface connection includes the crimping points between the two ends of the first core rod 121 and the connecting hardware 110 and the hanging wire hardware 140, and the crimping points between the two ends of the second core rod 122 and the connecting hardware 110 and the hanging wire hardware 140. The sealing effect is further improved by coating room temperature vulcanized silicone rubber at the interface connection and letting it cure to form a seal.

[0073] The method for preparing the insulating crossarm 10 provided in this embodiment can also be used to prepare the insulating crossarm 20. The difference from the third embodiment lies in the silicone rubber shed molding process. This molding process is called extrusion and shed. This process pre-extrudes a longer core rod preform and silicone rubber, forming a silicone rubber sheath that covers the outer surface of the core rod preform. This ensures a continuous and uniform silicone rubber sheath, thereby achieving good interface properties between the core rod preform and the silicone rubber sheath. The core rod preform is then cut to form first and second core rods 121, 122 of the desired length. Silicone rubber sheds are then applied over the silicone rubber sheathed first and second core rods 121, 122 to form an insulating layer 130. This improves production efficiency and reduces costs.

[0074] Embodiment 5:

[0075] like Figure 6 As shown, this embodiment provides a transmission pole 01, comprising a pole body 11, an insulating crossarm 10 fixed to the pole body 11, and a pole body fixing member 12. The insulating crossarm 10 is the insulating crossarm 10 described in the first embodiment. The insulating crossarm 10 also includes a connecting hardware 110, which has two first mounting holes (not shown) defined along the axis of the insulating crossarm 10. The rod fixing part 12 includes a U-shaped clamp 13 and a fastener 14. The fastener 14 includes a matching nut and a flat washer. The U-shaped clamp 13 and the fastener 14 fix the insulating crossarm 10 to the rod body 11 through two first mounting holes. A metal insert (not shown in the figure) can also be added to the two first mounting holes. The main body of the metal insert is cylindrical, and its size matches the size of the first mounting hole to ensure the accurate installation of the metal insert. The metal insert also includes a flange at one end of the metal insert main body, which forms a 90° angle with the main body of the metal insert to prevent the rod fixing part 12 from causing wear on the outer surface of the connecting hardware 110. It also facilitates installation and ensures a stable connection between the insulating crossarm 10 and the rod body 11. The insulating crossarm 10 also includes a top phase platform provided on the connecting hardware 110. The top phase insulator is vertically fixed on the top phase platform to enable the hanging of three-phase conductors.

[0076] Example 6:

[0077] like Figure 7As shown, this embodiment provides a transmission pole 02, which is similar to the transmission pole 01 of the fifth embodiment, except that the insulating crossarm fixed to the transmission pole 02 adopts the insulating crossarm 20 of the second embodiment. The insulating crossarm 20 includes a connecting hardware 210, which has four first mounting holes (not shown) symmetrically arranged along the axis of the insulating crossarm 20. That is, the four first mounting holes are distributed in a rectangular pattern. The transmission pole 02 also includes a pole body 21 and a pole body fixing part 22. The pole body fixing part 22 includes two U-shaped clamps 23 and fasteners 24. The fasteners 24 include matching nuts and flat washers. The two U-shaped clamps 23 and fasteners 24 fix the insulating crossarm 20 to the pole body 21 through four first mounting holes. Metal inserts (not shown in the figure) can also be added to the four first mounting holes. The main body of the metal insert is cylindrical, and its size matches the size of the first mounting hole to ensure the accurate installation of the metal insert. The metal insert also includes a flange located at one end of the metal insert main body, which is at a 90° angle to the main body of the metal insert to prevent the pole body fixing part 22 from causing wear on the outer surface of the connecting hardware 210. It also makes installation convenient and ensures a stable connection between the insulating crossarm 20 and the pole body 21.

[0078] The technical content and technical features of the present invention have been disclosed above. However, it is understood that, based on the creative ideas of the present invention, those skilled in the art may make various changes and improvements to the above-mentioned structures and materials, including combinations of the technical features disclosed or claimed herein, and obviously including other combinations of these features. Such variations and / or combinations fall within the technical field involved in the present invention and fall within the scope of protection of the claims of the present invention.

Claims

1. An insulating cross arm, characterized in that: include: A connecting fitting, the connecting fitting comprising a middle connecting portion and two sleeves respectively provided at both ends of the middle connecting portion; A mandrel, the mandrel comprising a first mandrel and a second mandrel, one end of the first mandrel and one end of the second mandrel being fixed in the two sleeves respectively; Two wire hanging hardware, the two wire hanging hardware being fixedly connected to the other end of the first core rod and the other end of the second core rod respectively; an insulating layer, the insulating layer covering and fixed to the outer circumference of the core rod, the insulating layer being located in areas other than the connecting hardware and the hanging hardware, and the insulating layer being sealed to the connecting hardware and to the hanging hardware; A pad is provided on one side surface of the intermediate connecting portion, and the pad has an arc-shaped surface concave toward the inner side of the intermediate connecting portion; the pad includes a first pad and a second pad, the first pad is located at the upper end of the intermediate connecting portion, and the second pad is located at the lower end of the intermediate connecting portion; A lightening hole is provided on the intermediate connecting portion, and a reinforcing rib is provided in the lightening hole in a direction perpendicular to the axis of the insulating cross arm. The lower end surface of the first spacer is flush with the upper inner wall of the lightening hole, and the upper end surface of the second spacer is flush with the lower inner wall of the lightening hole. The intermediate connecting portion is a plate, and the two sleeves extend outward from both ends of the intermediate connecting portion along the axis of the insulating cross-arm, and the two sleeves are hollow structures; in a direction perpendicular to the vertical plane on which the axis of the insulating cross-arm lies, the width of the intermediate connecting portion is smaller than the width of the sleeves; at least two first mounting holes are provided on the intermediate connecting portion along the axis of the insulating cross-arm, and a top phase platform is provided at the upper end of the intermediate connecting portion; Among them, on the side surface of the intermediate connecting part where the cushion block is located, the parts located on both sides of the cushion block are recessed toward the inner side of the intermediate connecting part to form a groove; on the side surface of the intermediate connecting part where the top phase platform is located, the part located between the two first mounting holes is recessed toward the inner side of the intermediate connecting part to form a groove, and the groove is only provided on one side surface of the intermediate connecting part where the first mounting hole is provided.

2. The insulating cross arm according to claim 1, characterized in that: The connecting hardware is an integrated casting hardware.

3. The insulating cross arm according to claim 1, characterized in that: A top phase hole is provided on the top phase platform.

4. The insulating cross arm according to claim 1, wherein: The sleeve includes a sleeve body and a flange arranged around the sleeve body and connected to the sleeve body, and the insulating layer is coated on the flange and a portion of the outer wall of the sleeve body.

5. A method for preparing an insulating cross arm, characterized in that: The steps include: Forming a first core rod, a second core rod, a connecting hardware and two hanging hardware; One end of the first mandrel and one end of the second mandrel are fixedly connected to the connecting hardware, and the other end of the first mandrel and the other end of the second mandrel are fixedly connected to two of the hanging hardware respectively to form a part to be covered; The insulating layer is entirely coated on the to-be-coated part, and the insulating layer covers the first core rod and the second core rod except for the connecting hardware and the hanging hardware, to obtain the insulating cross arm; A pad is provided on one side of the middle portion of the connecting fitting, and the pad has an arc-shaped surface that is concave toward the inner side of the connecting fitting; the pad includes a first pad and a second pad, the first pad is located at the upper end of the connecting fitting, and the second pad is located at the lower end of the connecting fitting; The connecting hardware includes an intermediate connecting portion and two sleeves respectively provided at both ends of the intermediate connecting portion. The intermediate connecting portion is a plate. The two sleeves respectively extend outward from both ends of the intermediate connecting portion along the axis direction of the insulating crossarm. The two sleeves are hollow structures. A lightening hole is provided on the intermediate connecting portion. A reinforcing rib is provided in the lightening hole in a direction perpendicular to the axis direction of the insulating crossarm. The lower end surface of the first pad is flush with the upper inner wall of the lightening hole, and the upper end surface of the second pad is flush with the lower inner wall of the lightening hole. In a direction perpendicular to the vertical plane on which the axis of the insulating cross-arm is located, the width of the intermediate connecting portion is smaller than the width of the sleeve; at least two first mounting holes are provided on the intermediate connecting portion along the axis of the insulating cross-arm, and a top phase platform is provided at the upper end of the intermediate connecting portion; Among them, on the side surface of the intermediate connecting part where the cushion block is located, the parts located on both sides of the cushion block are recessed toward the inner side of the intermediate connecting part to form a groove; on the side surface of the intermediate connecting part where the top phase platform is located, the part located between the two first mounting holes is recessed toward the inner side of the intermediate connecting part to form a groove, and the groove is only provided on one side surface of the intermediate connecting part where the first mounting hole is provided.

6. A method for preparing an insulating cross arm, characterized in that: The steps include: Forming a core rod preform, connecting hardware, two hanging hardware and several insulating sheds; Uniformly covering the outer surface of the core rod preform with an insulating sheath, and cutting the core rod preform into a first core rod and a second core rod; Fixing a plurality of insulating sheds on the insulating sheaths of the first core rod and the second core rod respectively to form an insulating layer; One end of the first core rod and one end of the second core rod are fixedly connected to the connecting hardware, and the other end of the first core rod and the other end of the second core rod are fixedly connected to two of the hanging hardware respectively to obtain the insulating cross arm; A pad is provided on one side of the middle portion of the connecting fitting, and the pad has an arc-shaped surface that is concave toward the inner side of the connecting fitting; the pad includes a first pad and a second pad, the first pad is located at the upper end of the connecting fitting, and the second pad is located at the lower end of the connecting fitting; The connecting hardware includes an intermediate connecting portion and two sleeves respectively provided at both ends of the intermediate connecting portion. The intermediate connecting portion is a plate. The two sleeves respectively extend outward from both ends of the intermediate connecting portion along the axis direction of the insulating crossarm. The two sleeves are hollow structures. A lightening hole is provided on the intermediate connecting portion. A reinforcing rib is provided in the lightening hole in a direction perpendicular to the axis direction of the insulating crossarm. The lower end surface of the first pad is flush with the upper inner wall of the lightening hole, and the upper end surface of the second pad is flush with the lower inner wall of the lightening hole. In a direction perpendicular to the vertical plane on which the axis of the insulating cross-arm is located, the width of the intermediate connecting portion is smaller than the width of the sleeve; at least two first mounting holes are provided on the intermediate connecting portion along the axis of the insulating cross-arm, and a top phase platform is provided at the upper end of the intermediate connecting portion; Among them, on the side surface of the intermediate connecting part where the cushion block is located, the parts located on both sides of the cushion block are recessed toward the inner side of the intermediate connecting part to form a groove; on the side surface of the intermediate connecting part where the top phase platform is located, the part located between the two first mounting holes is recessed toward the inner side of the intermediate connecting part to form a groove, and the groove is only provided on one side surface of the intermediate connecting part where the first mounting hole is provided.

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 is the insulating cross-arm according to any one of claims 1 to 4.

8. The transmission pole according to claim 7, wherein: The insulating cross arm includes a connecting hardware, and the connecting hardware is provided with at least two first mounting holes along the axis direction of the insulating cross arm. The transmission pole includes a pole body fixing piece, and the pole body fixing piece cooperates with the mounting holes to fix the insulating cross arm on the pole body.

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