Composite cross arm and power transmission pole

Abstract

The utility model discloses a composite cross arm which comprises a core rod. The middle fitting comprises a middle sleeve and a middle connecting part, the middle sleeve is arranged in the middle of the core rod in a sleeving mode, the middle connecting part is arranged on the bottom face of the middle sleeve, and a first connecting hole is formed in the middle connecting part; the first end part fitting is connected to one end of the core rod and is used for hanging a wire; the second end part fitting is connected to the other end of the core rod and is used for hanging external equipment; and the insulating layer covers at least part of the peripheral surface of the core rod. The composite cross arm can be connected with the electric pole through the middle fitting or the second end fitting, and the universality is higher. The utility model further discloses a power transmission pole.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of overhead transmission lines, in particular to a composite cross arm and a power transmission pole. BACKGROUND

[0002] The cross arm is a component installed on the power pole in the overhead line, which mainly supports the conductor. The traditional power transmission pole adopts an iron cross arm, and the conductor is hung by installing insulators on the iron cross arm. According to the design type of the cross arm on the power transmission pole, the function of the connecting hardware is fixed, for example, it is only used for fixing with the power pole or only used for hanging the conductor, and cannot be flexibly selected according to the application requirements during the installation of the power transmission pole, and the universality is not strong. CONTENT OF THE UTILITY MODEL

[0003] In view of the deficiencies of the prior art, one of the purposes of the present application is to provide a composite cross arm, which has flexible application of hardware structure and good universality.

[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is: a composite cross arm, comprising: a core rod; an intermediate hardware, the intermediate hardware comprising an intermediate sleeve and an intermediate connecting part, the intermediate sleeve being sleeved on the middle part of the core rod, the intermediate connecting part being arranged on the bottom surface of the intermediate sleeve, and the intermediate connecting part being provided with a first connecting hole; a first end hardware, the first end hardware being connected to one end of the core rod and used for hanging the conductor; a second end hardware, the second end hardware being connected to the other end of the core rod and used for hanging external equipment; and an insulating layer, the insulating layer covering at least part of the outer circumferential surface of the core rod.

[0005] Among them, the intermediate sleeve is a hollow tubular structure, and the cross-sectional shape and size of the intermediate sleeve match the cross section of the core rod.

[0006] Among them, the intermediate connecting part is a plate-shaped structure, which is connected vertically to the bottom surface of the intermediate sleeve, and the intermediate connecting part is located in the middle part of the intermediate sleeve.

[0007] Among them, one intermediate connecting part is arranged, and the plate surface direction of the intermediate connecting part is arranged along the axial direction of the intermediate sleeve.

[0008] Among them, two intermediate connecting parts are arranged, and the two intermediate connecting parts are arranged at intervals on both sides of the bottom surface of the intermediate sleeve.

[0009] Among them, the first end hardware comprises a first end sleeve and a wire hanging part connected in series, the first end sleeve is used for connecting one end of the core rod, and the wire hanging part is used for hanging the conductor.

[0010] Among them, the wire hanging part comprises a vertical end plate and a wire hanging plate connected in series, the end plate covers the end of the first end sleeve which is not connected to the core rod, the wire hanging plate extends vertically outward from the side of the end plate away from the first end sleeve, the wire hanging plate is provided with a mounting hole for mounting a wire clamp to hang the conductor.

[0011] The second end fitting includes a second end sleeve and a second hanging portion. The second end sleeve is used to connect to the other end of the core rod, and a second connecting hole is provided on the second hanging portion.

[0012] The second connecting portion is a plate structure, and the plate surface of the second hanging portion is arranged along the axial direction of the second end sleeve.

[0013] The second object of the present application is to provide a transmission pole, comprising a pole and the aforementioned composite crossarm, wherein the composite crossarm is connected to the pole via a second end fitting, or the composite crossarm is connected to one end of the second crossarm via an intermediate fitting, and the other end of the second crossarm is connected to the pole.

[0014] The beneficial effects of the present application are as follows: different from the prior art, the composite crossarm of the present application includes a core rod, an intermediate hardware, a first end hardware, and a second end hardware. The connection function of the hardware can be flexibly selected according to the use requirements. The second end hardware can be connected to other crossarms to form a combined crossarm, or it can be connected to a transmission pole through the second end hardware; it can be connected to the pole through the intermediate hardware, and it can also support external power equipment such as fuses through the intermediate hardware. Therefore, it can be applied to transmission poles of different structures according to actual needs, and has a wider range of applications.

[0015] In addition, compared with traditional iron crossarms, the use of composite crossarms to directly hang conductors can eliminate the suspended insulator structure, making the crossarm structure simpler, easier to install, less prone to rust, and longer in service life; and each insulating layer uses high-temperature vulcanized silicone rubber, which has good aging resistance and hydrophobic migration, which can reduce the probability of pollution flashover and rain flashover, and improve the electrical safety of the composite crossarm. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 1 is a schematic structural diagram of a transmission pole 1000 according to an embodiment of the present application;

[0017] Figure 2 This is a schematic structural diagram of a first cross arm 100 according to an embodiment of the present application;

[0018] Figure 3 This is an enlarged schematic diagram of a partial structure of the first intermediate hardware 120 fixed to the first core rod 110 in one embodiment of the present application;

[0019] Figure 4 yes Figure 2 A magnified schematic diagram of point A in the middle;

[0020] Figure 5 This application Figure 2 A magnified schematic diagram of point B in the middle;

[0021] Figure 6This is a schematic structural diagram of a composite crossarm according to an embodiment of the present application;

[0022] Figure 7 This is a schematic diagram of the wire hanging structure of the end fitting 140 according to one embodiment of the present application;

[0023] Figure 8 1 is a schematic structural diagram of an end fitting 140 according to another embodiment of the present application;

[0024] Figure 9 This is a schematic structural diagram of a second cross arm 200 according to an embodiment of the present application;

[0025] Figure 10 3 is a schematic structural diagram of a connection fitting 300 according to an embodiment of the present application. DETAILED DESCRIPTION

[0026] Upon request, specific embodiments of the present application will be disclosed herein. However, it should be understood that the embodiments disclosed herein are merely exemplary of the present application, 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 application in any appropriate manner in practice, including employing the various features disclosed herein in combination with features that may not be explicitly disclosed herein.

[0027] Unless otherwise expressly specified or limited, the term "connection" as used in this application should be understood in a broad sense, and may refer to direct connection or connection through an intermediate medium. In the description of this application, 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 only to facilitate the description of this application and simplify the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0028] In an application scenario, such as Figure 1 As shown, the present application provides a transmission pole 1000 , which includes a cross arm 10 and a pole 20 . The cross arm 10 is fixed on the pole 20 , and the cross arm 10 is a composite structure cross arm.

[0029] The crossarm 10 includes a first crossarm 100, two second crossarms 200 and two connecting hardware 300. The first crossarm 100 is an inverted V-shaped structure, and the top and both ends of the first crossarm 100 are used to hang wires respectively; the two second crossarms 200 are respectively connected to the opposite sides of the pole 20 to form a V-shaped structure, one end of the two second crossarms 200 is respectively connected to the middle of the first crossarm 100, and the other ends of the two second crossarms 200 are respectively connected to the two sides of the pole 20 through two connecting hardware 300. The length direction of the second crossarm 200 is inclined, and the second crossarm 200 is arranged below the first crossarm 100 and is located in the same vertical plane as the first crossarm 100.

[0030] The transmission pole 1000 of the present application utilizes a crossarm 10 for hanging conductors. The crossarm 10 utilizes a fully insulated structure, and the second crossarm 200 is used to raise the conductor's hanging height. This extends the insulation distance between the conductor at the high-voltage end of the transmission pole 1000 and the top of the pole 20 at the low-voltage end. This prevents birds from forming an electrical circuit regardless of their location on the transmission pole 1000, effectively preventing accidents such as tripping caused by electrocution. This provides increased safety and lowers operation and maintenance costs. It also effectively reduces the chance of birds being electrocuted and dying from landing on the transmission pole 1000, thereby protecting biodiversity. In traditional solutions, straight poles support conductors by providing suspended insulators on iron crossarms. Compared to traditional iron crossarms, the present application utilizes crossarms 10 for directly hanging conductors, eliminating the suspended insulator structure. This makes the crossarm structure simpler, installation more convenient, less prone to rust, and has a longer service life.

[0031] It should be noted that, unless otherwise specified, the middle portion in this application refers to the portion between the two ends, not strictly the central portion.

[0032] Combine Figure 2 and Figure 6 As shown, the first cross arm 100 includes two composite cross arms, each of which includes a core rod 110 (the marks in the figure are only for schematic reference, and for the convenience of distinguishing the description, it is recorded as the first core rod 110), an intermediate hardware 120 (for the convenience of distinguishing the description, it is recorded as the first intermediate hardware 120), a first end hardware 140, a second end hardware 160, and an insulating layer 150 (for the convenience of distinguishing the description, it is recorded as the first insulating layer 150). The first intermediate hardware 120 is connected to the middle of the first core rod 110, the first end hardware 140 is connected to one end of the first core rod 110 for hanging the wire, and the second end hardware 160 is connected to the other end of the first core rod 110 for hanging an external device. Specifically, the external device can be the second intermediate hardware 130, that is, Figure 2The two composite crossarms shown are connected by a second intermediate fitting 130, so that the two first core rods 110 are arranged at an angle. The two first core rods 110 are connected to either side of the second intermediate fitting 130 via a second end fitting 160. The second intermediate fitting 130 is used to hang conductors, and the two first end fittings 140 are also used to hang conductors, thereby allowing the first crossarm 100 to hang three-phase conductors. In this case, the first crossarm 100 is connected to one end of the two second crossarms 200 and the middle of the two first core rods 110 via two first intermediate fittings 120. A first insulating layer 150 covers at least a portion of the outer circumference of the first core rod 110.

[0033] In other embodiments, the external device may be an electric pole, and the composite crossarm is connected to the electric pole through the second end fitting. A connecting fitting that matches the second end fitting may be provided on the electric pole for connection. In this case, the composite crossarm is only connected to one-phase conductor through the first end fitting, and the first intermediate fitting can be used to support other external power equipment such as fuses.

[0034] The two first core rods 110 are arranged at an angle, that is, the two first core rods 110 are arranged to tilt downward, and the axis extension lines of the two first core rods 110 intersect, so that the first cross arm 100 can form an inverted V-shaped structure for hanging three-phase conductors.

[0035] Combine Figure 3 and Figure 4 As shown, the first intermediate hardware 120 includes an intermediate sleeve 121 and an intermediate connecting portion 122. The intermediate sleeve 121 is sleeved on the middle part of the first core rod 110. Specifically, the intermediate sleeve 121 is sleeved on the outer periphery of the first core rod 110 and fixed to the first core rod 110 through a crimping process; the side of the intermediate sleeve 121 facing the second cross arm 200 is defined as the bottom surface, and the intermediate connecting portion 122 is arranged on the bottom surface of the intermediate sleeve 121. The intermediate connecting portion 122 is used to connect the second cross arm 200.

[0036] The intermediate sleeve 121 is a hollow tubular structure, and the cross-sectional shape and size of the intermediate sleeve 121 match the cross-sectional shape of the first core rod 110, so that the intermediate sleeve 121 can be sleeved and fixed on the outer periphery of the first core rod 110, and the contact area between the two is increased, thereby ensuring the connection strength between the intermediate sleeve 121 and the first core rod 110.

[0037] The intermediate connecting portion 122 is a plate-like structure, which is vertically connected to the bottom surface of the intermediate sleeve 121, and the intermediate connecting portion 122 is located in the middle of the intermediate sleeve 121, so that the force on the subsequent second cross arm 200 is more uniform after installation; a first connecting hole 1221 is provided on the intermediate connecting portion 122, which is used to match and connect with the second cross arm 200 through fasteners such as bolts and screws, that is, there is no need to drill holes on the intermediate sleeve 121 and the first core rod 110 for connection, thereby avoiding the drilling affecting the mechanical properties of the first core rod 110, and thus avoiding the occurrence of electrical safety hazards.

[0038] In one embodiment, if Figure 3 As shown, one intermediate connecting part 122 can be provided, and the plate surface direction of the intermediate connecting part 122 is provided along the axial direction of the intermediate sleeve 121, and the through direction of the first connecting hole 1221 is perpendicular to the axial direction of the intermediate sleeve 121, so that after the first intermediate hardware 120 is fixed on the first core rod 110, the plate surface direction of the intermediate connecting part 122 and the length direction of the first cross arm 100 are located in the same vertical plane, which facilitates the assembly of the first cross arm 100 and the second cross arm 200.

[0039] In another embodiment, Figure 4 As shown, two intermediate connecting parts 122 can be provided, and the two intermediate connecting parts 122 are spaced apart and arranged on the two side edges of the bottom surface of the intermediate sleeve 121. In this way, the two intermediate connecting parts 122 can be matched and connected with the second cross arm 200 by clamping and fixing, and the connection strength between the first cross arm 100 and the second cross arm 200 is further improved without affecting the mechanical properties of the first core rod 110.

[0040] It is understandable that the number and specific arrangement of the intermediate connecting parts 122 can also adopt other forms, as long as they can be matched and connected with the second cross arm 200, and no specific limitation is made here.

[0041] Combine Figure 5 and Figure 6 As shown, the second intermediate hardware 130 includes a top connecting portion 131 , and a first hanging portion 1311 is provided in the middle of the bottom side of the top connecting portion 131 . The first hanging portion 1311 is used to hang the wire through a wire clamp.

[0042] Among them, the first hanging part 1311 can be a wire hanging plate, that is, the wire hanging plate extends outward from the middle part of the bottom side of the top connecting part 131 along the plate surface direction of the top connecting part 131. The wire hanging plate is provided with a hanging hole for installing the suspension wire clamp 12 through components such as a U-shaped hanging ring to hang the wire. When installing the wire, first fix the wire on the suspension wire clamp 12, then assemble the suspension wire clamp 12 with the U-shaped hanging ring, and then clamp the U-shaped hanging ring on both sides of the wire hanging plate, and align the mounting hole on the U-shaped hanging ring with the hanging hole, and then insert bolts, screws and other fasteners to hang the suspension wire clamp 12 on the hanging hole, so that the wire is firmly hung on the second intermediate hardware 130. The width of the wire hanging plate along the extension direction of the wire is smaller than the width of the top connecting part 131, which can reduce the weight of the top connecting part 131 while ensuring the hanging effect, thereby reducing costs.

[0043] The first hanging portion 1311 can also be a hanging hole provided in the middle portion of the bottom side of the top connecting portion 131. A suspension wire clamp 12 can be directly mounted in the hanging hole to hang the wire. This further reduces the weight of the top connecting portion 131 and reduces costs. The suspension wire clamp 12 adopts a conventional wire clamp structure and is not specifically limited here.

[0044] The second end fitting 160 includes a second end sleeve 161 and a second connecting portion 162. The second end sleeve 161 is a tubular structure with one closed end connected to the second connecting portion 162, while the open end is sleeved onto the other end of the first mandrel 110. The cross-sectional shape and dimensions of the second end sleeve 161 match those of the first mandrel 110. The second connecting portion 162 is a plate structure with its plate surface oriented axially along the second end sleeve 161. The second connecting portion 162 is provided with a plurality of second connection holes 163, which extend perpendicularly to the plate surface of the second connecting portion 162 and are adapted to mate with the top connecting portion 131. The width of the second connecting portion 162 along the wire extension direction is smaller than that of the second end sleeve 161. This ensures connection strength while reducing the weight and cost of the second end fitting 160.

[0045] The top connecting portion 131 includes two top connecting plates 1312, which clamp and secure the two second hooking portions 162, effectively ensuring the connection strength between them and thus the overall mechanical strength of the first crossarm 100. The two top connecting plates 1312 are provided with two corresponding sets of top connecting holes 13121, located on either side of the top connecting plates 1312. The top connecting holes 13121 extend perpendicularly to the surface of the top connecting plates 1312. Each set of top connecting holes 13121 matches the number and position of the plurality of second connecting holes 163. On each top connecting plate 1312, the centers of each set of top connecting holes 13121 are located on the same straight line, and the line connecting the centers of the two sets of top connecting holes 13121 is arranged at an angle. Correspondingly, the centers of the plurality of second connecting holes 163 are all located on the axis of the second end sleeve 161. In this way, when the first core rod 110 is installed in the second end sleeve 161, and when the top connecting plate 1312 is matched and connected to the two second end sleeves 161 via the two second hanging portions 162, the two first core rods 110 can directly form an inverted V-shaped structure, which is simple and efficient to install. During installation, the two top connecting plates 1312 are clamped on both sides of the two second hanging portions 162, and after the two sets of top connecting holes 13121 on each top connecting plate 1312 are matched and aligned with the plurality of second connecting holes 163 on the two second hanging portions 162, fasteners such as bolts and screws are inserted and tightened to connect the top connecting portion 131 to the second end sleeve 161. In other embodiments, the top connection hole and the second connection hole may also be arranged in other ways, as long as the two can be matched and connected so that the first cross arm has an inverted V-shaped structure as a whole. No specific limitation is made here.

[0046] Furthermore, the top connecting plate 1312 is roughly triangular in structure, and two groups of top connecting holes 13121 are respectively arranged on the two side edges of the top connecting plate 1312, which can save unnecessary material waste, further reduce the weight of the top connecting part 131, and reduce costs.

[0047] At least one top connecting plate 1312 is provided with a first hanging portion 1311. The structure of the first hanging portion 1311 is as described above and will not be further described. In one embodiment, one first hanging portion 1311 is provided. When the first hanging portion 1311 adopts a wire hanging plate structure, a wire hanging plate can be directly extended from the middle portion of the bottom side of one of the top connecting plates 1312 to hang the suspension wire clamp 12. When the first hanging portion 1311 adopts a hanging hole structure, a hanging hole can be directly provided in the middle portion of the bottom side of one of the top connecting plates 1312 to hang the suspension wire clamp 12. A corresponding cavity is provided on the other top connecting plate 1312 to avoid interference with the first hanging portion 1311 hanging wire. In another embodiment, two first hanging portions 1311 are provided. Regardless of the structure of the first hanging portion 1311, the first hanging portions 1311 on the two top connecting plates 1312 are provided correspondingly. By cooperating with the two first hanging portions 1311 to hang the suspension wire clamp 12, the connection strength between the two can be further improved, thereby improving the overall mechanical strength of the first cross arm 100.

[0048] Furthermore, the first crossarm 100 can adopt a symmetrical inverted V-shaped structure, that is, the two second end sleeves 161 are symmetrically and obliquely arranged on both sides of the top connecting portion 131, so that when the two first core rods 110 are respectively installed in the two second end sleeves 161, the two first core rods 110 can be symmetrically and obliquely connected to both sides of the second intermediate hardware 130, so that the first crossarm 100 has a symmetrical structure as a whole, and the horizontal heights of the wires hung at both ends of the first crossarm 100 are equal, and the distances from the wires hung on the top of the first crossarm 100 in the vertical direction are equal, so that the force on the first crossarm 100 is more balanced and the structure is more stable.

[0049] It can be understood that the angle of the V-shaped opening of the first crossarm 100 can be specifically designed according to the insulation requirements of the crossarm 10 in different application scenarios. It only needs to adjust the connection angle between the top connecting part 131 and the two second end sleeves 161 accordingly. It can be achieved by replacing different second intermediate hardware 130 or providing multiple groups of top connecting holes 13121 with different angles on the top connecting plate 1312, etc., and no specific restrictions are imposed here.

[0050] Combine Figure 2 、 Figures 6-8 As shown, the first end fitting 140 includes a first end sleeve 141 and a wire hanging portion 142 connected to each other. The first end sleeve 141 is used to connect one end of the first core rod 110, and the wire hanging portion 142 is used to directly hang the wire or to hang the wire through a wire clamp.

[0051] In one embodiment, if Figure 7As shown, the first end fitting 140 is a gland type fitting, and can directly hang the wire. The first end sleeve 141 is sleeved on the outer periphery of the end of the first core rod 110, and the first end sleeve 141 is a tubular structure with one end closed, and the cross-sectional shape and size of the first end sleeve 141 match the cross section of the first core rod 110. The wire hanging part 142 includes a base 1421, a gland 1422, and two lugs 1423. The base 1421 covers the end of the first end sleeve 141 that is not connected to the first core rod 110, and the base 1421 is provided with a first slot 14211, which is an arc-shaped slot for placing the wire. The base 1421 is provided with two mounting holes, which are respectively located on the two sides of the first slot 14211 and are used for matching connection with the gland 1422. The bottom of the gland 1422 is provided with a second slot 14221, which is also an arc-shaped slot for assisting in fixing the wire. The setting direction of the first slot 14211 and the second slot 14221 is perpendicular to the axial direction of the first core rod 110, and the two cooperate to facilitate the stable hanging of the wire. The two lugs 1423 are respectively connected to the two sides of the gland 1422, and the two lugs 1423 are located on the two sides of the axial direction of the second slot 14221. The lug 1423 is provided with a mounting hole, and the mounting holes on the two lugs 1423 are correspondingly provided on the mounting holes on the base 1421, so that the lug 1423 can be fastened and connected to the base 1421 by bolts, screws or other fasteners, and the gland 1422 can be pressed and fixed to the wire. When installing the wire, the wire is placed in the first slot 14211, the gland 1422 is placed above the wire, the second slot 14221 is attached to the top of the wire and presses the wire, and then the fastener is correspondingly inserted into the mounting holes of the lug 1423 and the base 1421 and is tightly fixed, so that the gland 1422 is fixedly connected to the base 1421, thereby stably hanging the wire on the first end fitting 140.

[0052] Further, the bottom of the wire hanging part 142 is provided with a lifting part 143, and the lifting part 143 is provided with a lifting hole 1431, which is used to meet the lifting requirement, i.e., to lift and install the first cross arm 100 by a rope or other tool. The width of the lifting part 143 along the wire extension direction is less than the width of the first end sleeve 141, which can reduce the weight of the first end fitting 140 while ensuring the wire hanging effect, thereby reducing the cost.

[0053] In another embodiment, as Figure 8As shown, the first end fitting 140 is a groove type clamp fitting, which can hang the conductor through the support clamp 11. The first end fitting 140 comprises a first end sleeve 141 and a wire hanging part 142 connected with each other. The structure of the first end sleeve 141 is as described above, which will not be repeated here. The wire hanging part 142 is a groove structure, which covers the end of the first end sleeve 141 not connected with the first core rod 110. The groove structure is a U-shaped groove, the groove opening of which is upwardly arranged, and mounting holes are correspondingly arranged on the two side walls of the U-shaped groove, which are used to mount the support clamp 11 through bolts, screws and other fasteners, so as to hang the conductor. The support clamp 11 comprises a clamp base and a clamp cover. The clamp base is provided with an arc-shaped groove, which is used to place the conductor. The bottom of the clamp cover is correspondingly provided with an arc-shaped groove, which is used to assist in fixing the conductor. Mounting holes are correspondingly arranged on both sides of the arc-shaped grooves on the clamp base and the clamp cover, which are used to press and fix the conductor between the clamp base and the clamp cover through bolts, screws and other fasteners. The two ends of the clamp base are also provided with mounting holes, which are used to fixedly connect with the two side walls of the U-shaped groove. When installing the conductor, first, the conductor is fixed on the support clamp 11, i.e. the conductor is placed in the arc-shaped groove of the clamp base, and the clamp cover is pressingly fixed on the clamp base. Then, the support clamp 11 is placed in the groove structure of the first end fitting 140, and the mounting holes at the two ends of the clamp base are aligned with the mounting holes on the two side walls of the U-shaped groove, and then the fasteners are arranged to fix the support clamp 11 in the groove structure, so as to stably hang the conductor on the first end fitting 140. The bottom of the wire hanging part 142 is provided with a lifting part 143, the structure and purpose of which are as described above, which will not be repeated here. The support clamp 11 adopts the clamp structure in the prior art, which will not be specifically limited here.

[0054] In yet another embodiment, as Figure 2 and Figure 6As shown, the first end fitting 140 is a plate-type wire clamp fitting, which can be used to hang the wire through the suspension clamp 12. The first end fitting 140 includes a connected first end sleeve 141 and a wire hanging portion 142. The structure of the first end sleeve 141 is as described above and will not be repeated here. The wire hanging portion 142 is a plate structure, which includes a vertically connected end plate and a wire hanging plate. The end plate covers the end of the first end sleeve 141 that is not connected to the first core rod 110. The wire hanging plate extends vertically outward from the side of the end plate away from the first end sleeve 141. The wire hanging plate is provided with a mounting hole for mounting the suspension clamp 12 through components such as a U-shaped hanging ring to hang the wire. When installing the wire, first fix the wire on the suspension clamp 12, then assemble the suspension clamp 12 with the U-shaped hanging ring, and then clamp the U-shaped hanging ring on both sides of the hanging plate of the first end hardware 140. After aligning the mounting holes on the U-shaped hanging ring with the mounting holes on the hanging plate, fasteners such as bolts and screws are inserted to hang the suspension clamp 12 on the hanging plate, thereby firmly hanging the wire on the first end hardware 140. The width of the hanging plate along the extension direction of the wire is smaller than the width of the first end sleeve 141, which can reduce the weight of the first end hardware 140 while ensuring the hanging effect, thereby reducing costs. The suspension clamp 12 adopts the wire clamp structure in the prior art and is not specifically limited here.

[0055] In other embodiments, the first end fitting may also adopt an existing fitting structure as long as it can be used to hang the wire, and the wire clamp may also adopt a tension wire clamp to be applied to the tension rod, without specific limitation here.

[0056] like Figure 9 As shown, the second cross arm 200 includes a second core rod 210 (marked in the figure for schematic purposes only), a first hardware fitting 220, a second hardware fitting 230 and a second insulating layer 240. The first hardware fitting 220 connects one end of the second core rod 210 and the middle part of the first cross arm 100; the second hardware fitting 230 connects the other end of the second core rod 210 and the connecting hardware fitting 300; the second insulating layer 240 covers at least part of the outer circumference of the second core rod 210.

[0057] The first fitting 220 comprises a first sleeve 221 and a first connecting portion 222 connected with each other. One end of the first sleeve 221 is connected with one end of the second core rod 210, for example, the first sleeve 221 can be connected with the second core rod 210 through a press-fit process. The first connecting portion 222 is used for connecting the middle portion of the first cross arm 100. The first connecting portion 222 is in a plate shape. The first connecting portion 222 is provided with a third connecting hole 2221, which is used for matching connection with the first connecting hole 1221 on the intermediate connecting portion 122, so as to realize the assembly of the first cross arm 100 and the second cross arm 200. During installation, the first connecting portion 222 is arranged in close contact with the intermediate connecting portion 122. After the third connecting hole 2221 is aligned with the first connecting hole 1221, a fastener such as a bolt or a screw rod is arranged and fastened, so as to connect the first connecting portion 222 and the intermediate connecting portion 122 together, thereby connecting one end of the second cross arm 200 with the middle portion of the first cross arm 100.

[0058] The second fitting 230 comprises a second sleeve 231 and a second connecting portion 232 connected with each other. One end of the second sleeve 231 is connected with the other end of the second core rod 210, for example, the second sleeve 231 can be connected with the second core rod 210 through a press-fit process. The second connecting portion 232 is used for connecting with the connecting fitting 300, and then connecting the second cross arm 200 and the pole 20. The second connecting portion 232 comprises a first connecting plate 2321 and two second connecting plates 2322. The first connecting plate 2321 covers the end of the second sleeve 231 which is not connected with the second core rod 210. The two second connecting plates 2322 are respectively connected with the two ends of the first connecting plate 2321 perpendicularly. The two second connecting plates 2322 extend away from the second sleeve 231 from the two ends of the first connecting plate 2321 in the same direction, so that the second connecting portion 232 is in a “” shape. Each of the second connecting plates 2322 is provided with two groups of fourth connecting holes 23221. The fourth connecting holes 23221 on the two second connecting plates 2322 are arranged correspondingly, and are used for matching connection with the connecting fitting 300 through a fastener such as a bolt or a screw rod. That is, the second sleeve 231 and the second core rod 210 do not need to be punched for connection, so as to avoid the influence of punching on the mechanical properties of the second core rod 210, and then avoid the generation of power safety hazards.

[0059] As shown in Figure 10 The connecting fitting 300 comprises a pole connecting portion 310 and a cross arm connecting portion 320 connected with each other. The pole connecting portion 310 is connected with the pole 20. The cross arm connecting portion 320 is connected with the other end of the second cross arm 200, and the angle between the second cross arm 200 and the pole 20 is adjustable.

[0060] In this embodiment, the pole 20 has a square cross-section, and the pole connection portion 310 is configured as a corresponding plate-shaped structure. This increases the contact area between the pole connection portion 310 and the pole 20, ensuring a secure connection between the two. The pole connection portion 310 includes a first plate 311 having a first pole connection hole 3111 defined therein for securing the first plate 311 to the pole 20 via fasteners such as bolts and screws.

[0061] The crossarm connecting portion 320 includes two second plates 321, which are roughly rectangular plates. One end of the two second plates 321 is respectively perpendicularly connected to the two ends of the first plate 311, and the two second plates 321 extend in the same direction from the two ends of the first plate 311 in the direction away from the first plate 311. The distance between the mutually approaching plate surfaces of the two second plates 321 is slightly larger than the distance between the mutually distant plate surfaces of the two second connecting plates 2322 of the second connecting portion 232 of the second hardware 230. On the one hand, the second connecting portion 232 can be moved between the two second plates 321, which is convenient for adjusting the angle between the second crossarm 200 and the pole 20; on the other hand, the two second plates 321 can be clamped and fixed with the two second connecting plates 2322 by fasteners such as bolts and screws, ensuring a reliable connection between the second crossarm 200 and the pole 20. The second plate 321 is provided with a fixing hole 3211 and an adjustment hole 3212. The fixing hole 3211 is a circular through-hole, and the adjustment hole 3212 is an arc-shaped hole. The arc of the adjustment hole 3212 is concentric with the fixing hole 3211. The two holes cooperate to enable the second crossarm 200 to rotate about the fixing hole 3211, facilitating adjustment of the angle between the second crossarm 200 and the pole 20 and securing the second crossarm 200 to the connecting hardware 300. The fixing hole 3211 and adjustment hole 3212 on each second plate 321 are respectively corresponding to the fourth connecting hole 23221 on each second connecting plate 2322, facilitating adjustment of the angle between the second crossarm 200 and the pole 20 and securing the second crossarm 200 to the connecting hardware 300. The angle between the second crossarm 200 and the pole 20 can be adjusted according to design requirements, providing flexible installation and reliable connection. The independent hardware structure makes it suitable for installing crossarms 10 of different lengths and specifications, thus having a wide range of applications.

[0062] In this embodiment, the length of the first plate 311 along the length direction of the pole 20 is smaller than the length of the second plate 321, and the first plate 311 is located at the upper part of the second plate 321, and the fixing hole 3211 and the adjustment hole 3212 are located in the middle part of the second plate 321, that is, the fixing hole 3211 and the adjustment hole 3212 are located below the first pole connection hole 3111, which can prevent the fasteners between the pole connection part 310 and the pole 20 from affecting the rotation adjustment of the angle between the second cross arm 200 and the pole 20, and at the same time can reduce the material consumption of the connecting hardware 300 and reduce the manufacturing cost.

[0063] When installing the connecting fitting 300, first place the first plate 311 of the pole connecting part 310 close to the pole 20, and align the first pole connecting hole 3111 on the first plate 311 with the installation hole on the pole 20, then insert bolts, screws and other fasteners and tighten them to fix the connecting fitting 300 on the pole 20. When installing the second crossarm 200, the second connecting portion 232 is placed between the two second plates 321, and the fixing holes 3211, the adjusting holes 3212 and the two groups of fourth connecting holes 23221 of the second connecting portion 232 are aligned, and bolts, screws and other fasteners are inserted into the corresponding fixing holes 3211 and the fourth connecting holes 23221, the adjusting holes 3212 and the fourth connecting holes 23221 for pre-fixing, that is, the approximate positions of the two are limited under the premise of not affecting the rotation of the second connecting portion 232 in the crossarm connecting portion 320. At this time, the second crossarm 200 can rotate around the fixing holes 3211 as the center, that is, when the second crossarm 200 rotates, the fasteners in the fixing holes 3211 remain in position unchanged, and the fasteners in the adjusting holes 3212 slide and adjust in the adjusting holes 3212 around the fixing holes 3211 as the center. After the angle between the second crossarm 200 and the pole 20 is adjusted to the preset angle, the above fasteners are tightened to fix the second crossarm 200 to the pole 20. In other embodiments, after the connecting hardware is fixed on the pole, fasteners can be inserted into the corresponding fixing holes and the fourth connecting hole for pre-fixing. When the second cross arm is adjusted into place, the fasteners are tightened, and fasteners are inserted into the corresponding adjustment holes and the fourth connecting hole and tightened to fix the second cross arm to the pole. No specific restrictions are made here.

[0064] Furthermore, in order to make the connection between the connecting fitting 300 and the pole 20 more stable, the pole connecting part 310 also includes a third plate 312, the two ends of the third plate 312 are respectively connected to the other ends of the two second plates 321 that are not connected to the first plate 311, so that the first plate 311 and the third plate 312 are respectively located on the axial sides of the second plate 321, and the length of the third plate 312 along the length direction of the pole 20 is less than the length of the second plate 321. The third plate 312 is located at the lower part of the second plate 321, that is, the first plate 311 and the third plate 312 are respectively located on the upper and lower sides of the second plate 321 in the vertical direction. A second pole connecting hole 3121 is provided on the third plate 312, which is used to further fix the connecting fitting 300 to the pole 20 by fasteners such as bolts and screws. The provision of the third plate 312, on the one hand, allows the upper and lower ends of the connecting hardware 300 to be fastened to the electric pole 20 simultaneously through the first plate 311 and the third plate 312, making the force between the two more uniform and the connection more reliable; on the other hand, disposing the third plate 312 at the end of the second plate 321 away from the electric pole 20 can avoid interference between the third plate 312 and the fasteners on the second plate 321 during installation. During installation, first connect the connecting hardware 300 to the electric pole 20 through the first plate 311, then install the second cross arm 200 and adjust it into place, and then insert bolts, screws and other fasteners into the second electric pole connection hole 3121 on the third plate 312 and the installation hole on the electric pole 20 and tighten them, thereby further fixing the connecting hardware 300 to the electric pole 20.

[0065] Furthermore, both second plates 321 are provided with flanges 3213, which extend vertically from the side of the second plate 321 close to the pole 20 in a direction away from the first plate 311, and both flanges 3213 are located in the same plane as the first plate 311. The provision of the flanges 3213 can increase the contact area between the connecting hardware 300 and the pole 20, making the force between the two more uniform and the connection more reliable.

[0066] In one embodiment, the first core rod 110 and the second core rod 210 are both made of composite materials, such as glass fiber or aramid fiber impregnated with epoxy resin and then pultruded. Compared with the metal material of traditional crossarms, composite materials are more corrosion-resistant and low-cost, and can achieve significant weight reduction, making the crossarm 10 easy to install.

[0067] In one embodiment, the first core rod 110 has a square cross-section, and the second core rod 210 has a circular cross-section. This configuration ensures that the crossarm 10 has good overall structural strength, a simple structure, and low cost. In other embodiments, the cross-sections of the first and second core rods can also be triangular, T-shaped, L-shaped, or other shapes, as long as the structure of each core rod meets the strength requirements. The core rods can have different or identical structures, for example, the first core rod can have a triangular cross-section and the second core rod can have a square cross-section, or the cross-sections of the core rods can all be square or circular, etc., without specific limitation.

[0068] In one embodiment, the cross-sectional shape and size of the hardware sleeve on each core rod match the cross-sectional shape of the corresponding core rod, that is, the cross-sectional shape and size of the intermediate sleeve 121, the second end sleeve 161 and the first end sleeve 141 match the cross-sectional shape and size of the first core rod 110, and the cross-sectional shape and size of the first sleeve 221 and the second sleeve 231 match the cross-sectional shape and size of the second core rod 210, so as to fix each sleeve on the corresponding core rod and increase the contact area between each sleeve and the corresponding core rod, thereby ensuring the connection strength between each hardware and the corresponding core rod.

[0069] In one embodiment, each hardware is formed into a separate hardware component and then connected together by welding, which provides reliable connection and simple manufacturing. In other embodiments, each hardware can also be integrally formed by casting or other methods, as long as the connection strength between the components can be guaranteed. No specific restrictions are imposed here.

[0070] In one embodiment, the first insulating layer 150 and the second insulating layer 240 both include a sheath. The sheath of the first insulating layer 150 is sealedly connected to the first intermediate hardware 120, the first end hardware 140, and the second end hardware 160 in the middle of the first core rod 110. The sheath of the second insulating layer 240 is sealedly connected to the first hardware 220 and the second hardware 230 at both ends of the second core rod 210, which can effectively prevent external water vapor from invading and damaging the first core rod 110 and the second core rod 210, thereby avoiding affecting the service life of the cross arm 10.

[0071] Furthermore, the first insulating layer 150 and the second insulating layer 240 may also include umbrella skirts spaced apart on the sheath. The setting of the umbrella skirts can increase the creepage distance of the outer surfaces of the first crossarm 100 and the second crossarm 200, so that the crossarm 10 has a sufficient dry arc distance. In addition, the setting of the umbrella skirts can also prevent birds from nesting, thereby improving the overall electrical safety of the crossarm 10.

[0072] In one embodiment, both the first insulating layer 150 and the second insulating layer 240 are high-temperature vulcanized silicone rubber. The silicone rubber material is integrally vacuum-injected onto the outer circumference of the first core rod 110 and the second core rod 210 to form a high-temperature vulcanized silicone rubber insulation layer. High-temperature vulcanized silicone rubber has excellent aging resistance and hydrophobic migration properties, which can reduce the probability of pollution flashover and rain flashover, thereby improving the electrical safety of the crossarm 10. In other embodiments, the first and second insulating layers can also be molded or pre-formed and then attached to the outer circumference of the corresponding core rods, without specific limitation herein.

[0073] It can be understood that the overall length of the crossarm 10 of the present application, the length of the first crossarm 100 and the second crossarm 200, the specifications of the support wire clamp 11 and the suspension wire clamp 12, etc. can be adjusted accordingly according to needs; and the installation order of the crossarm 10 can also be adjusted accordingly according to needs, that is, the two second crossarms 200 can be fixed to the pole 20 through the connecting hardware 300 first, and then the first crossarm 100 can be fixed, or the first crossarm 100, the two second crossarms 200, and the connecting hardware 300 can be assembled first, and then installed on the pole 20 for adjustment and fixation. No specific restrictions are made here.

[0074] The beneficial effects of the present application are as follows: different from the prior art, the composite crossarm of the present application includes a core rod, an intermediate hardware, a first end hardware, and a second end hardware. The connection function of the hardware can be flexibly selected according to the use requirements. The second end hardware can be connected to other crossarms to form a combined crossarm, or it can be connected to a transmission pole through the second end hardware; it can be connected to the pole through the intermediate hardware, and it can also support external power equipment such as fuses through the intermediate hardware. Therefore, it can be applied to transmission poles of different structures according to actual needs, and has a wider range of applications.

[0075] At the same time, this application connects the second crossarm and the pole through adjustable connecting hardware, and the angle between the second crossarm and the pole can be adjusted according to design requirements. The installation is flexible and the connection is reliable; and the independent hardware structure makes it suitable for installing composite crossarms of different lengths and specifications, with a wider range of applications.

[0076] In addition, compared with traditional iron crossarms, this application uses composite crossarms to directly hang conductors, which can eliminate the suspended insulator structure, making the crossarm structure simpler, more convenient to install, less prone to rust, and longer in service life; and each insulating layer uses high-temperature vulcanized silicone rubber, which has good aging resistance and hydrophobic migration, can reduce the probability of pollution flashover and rain flashover, and improve electrical safety.

[0077] The technical content and features of this application have been disclosed above. However, it is understood that, based on the creative ideas of this application, 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 this application and fall within the scope of protection of the claims of this application.

Claims

1. A composite cross arm, characterized in that: include: mandrel; An intermediate hardware, comprising an intermediate sleeve and an intermediate connecting portion, wherein the intermediate sleeve is sleeved on the middle portion of the core rod, the intermediate connecting portion is arranged on the bottom surface of the intermediate sleeve, and a first connecting hole is provided on the intermediate connecting portion; a first end fitting connected to one end of the core rod for hanging a wire; a second end fitting connected to the other end of the mandrel for hooking an external device; An insulating layer covers at least a portion of the outer circumference of the core rod.

2. The composite cross arm according to claim 1, characterized in that: The intermediate sleeve is a hollow tubular structure, and the cross-sectional shape and size of the intermediate sleeve match the cross-sectional shape of the core rod.

3. The composite cross arm according to claim 1, wherein: The intermediate connecting portion is a plate-shaped structure, vertically connected to the bottom surface of the intermediate sleeve, and the intermediate connecting portion is located in the middle of the intermediate sleeve.

4. The composite cross arm according to claim 3, characterized in that: An intermediate connecting portion is provided, and the plate surface direction of the intermediate connecting portion is arranged along the axial direction of the intermediate sleeve.

5. The composite cross arm according to claim 3, characterized in that: Two intermediate connecting parts are provided, and the two intermediate connecting parts are spaced apart and arranged on both side edges of the bottom surface of the intermediate sleeve.

6. The composite cross arm according to claim 1, wherein: The first end fitting includes a first end sleeve and a wire hanging portion connected to each other. The first end sleeve is used to connect the one end of the core rod, and the wire hanging portion is used to hang the wire.

7. The composite cross arm according to claim 6, characterized in that: The wire hanging part includes an end plate and a wire hanging plate vertically connected to each other, the end plate covers the end of the first end sleeve that is not connected to the core rod, the wire hanging plate extends vertically outward from the side of the end plate away from the first end sleeve, and the wire hanging plate is provided with a mounting hole for installing a wire clamp to hang the wire.

8. The composite cross arm according to claim 1, wherein: The second end fitting includes a second end sleeve and a second hanging portion. The second end sleeve is used to connect to the other end of the core rod. A second connecting hole is provided on the second hanging portion.

9. The composite cross arm according to claim 8, characterized in that: The second hanging portion is a plate structure, and the plate surface of the second connecting portion is arranged along the axial direction of the second end sleeve.

10. A transmission pole, characterized in that: The composite crossarm comprises an electric pole and the composite crossarm according to any one of claims 1 to 9, wherein the composite crossarm is connected to the electric pole via the second end fitting, or the composite crossarm is connected to one end of the second crossarm via the intermediate fitting, and the other end of the second crossarm is connected to the electric pole.

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