Composite crossarm

Abstract

The present application discloses a composite crossarm, configured to be fixed to a utility pole and hang a wire. The composite crossarm comprises a first crossarm, which comprises: a first core rod; an intermediate fitting, wherein the intermediate fitting is a cross-shaped fitting, and the intermediate fitting is connected to the middle of the first core rod for fixing the first crossarm to a utility pole; two wire-hanging fittings connected to two ends of the first core rod, respectively, and used for hanging wires; and a first insulating layer covering at least part of the peripheral face of the first core rod. The composite crossarm of the present application has a simple overall structure, reliable strength, easy installation, and a low manufacturing cost.

Description

A composite crossarm Technical Field

[0001] The present application relates to the technical field of insulating crossarms, and more specifically to a composite crossarm. Background Art

[0002] Currently, commonly used composite crossarms usually use glass fiber pultruded tubes as the main structure, filled with polyurethane foam inside, and coated with special substances on the surface to prevent UV aging. They are not environmentally friendly. During installation, the composite crossarms need to be punched, which reduces the strength of the composite crossarms and makes their lifespan worrying. They also need to be used in conjunction with porcelain insulators, which is inconvenient. The product structure is complex, the manufacturing cost is too high, and the price is expensive.

[0003] Summary of the Invention

[0004] In view of the deficiencies in the prior art, the purpose of this application is to provide a composite crossarm to solve the problems of the existing composite crossarms such as complex structure, low strength and inconvenient installation.

[0005] To achieve the above-mentioned purpose, the technical means adopted in this application are as follows: a composite crossarm, used to be fixed on an electric pole to hang a conductor, comprising a first crossarm, the first crossarm comprising: a first core rod; an intermediate hardware, the intermediate hardware being a cross-shaped hardware, the intermediate hardware being connected to the middle part of the first core rod, and being used to fix the first crossarm on the electric pole; two hanging wire hardware, respectively connected to the two ends of the first core rod, and being used to hang the conductor; a first insulating layer, the first insulating layer covering at least a portion of the outer circumference of the first core rod.

[0006] Preferably, the composite cross arm further includes a second cross arm, the first cross arm is fixed on the pole in the horizontal direction, the second cross arm is fixed on the pole in the vertical direction and is located above the first cross arm, and the first cross arm and the second cross arm are arranged separately.

[0007] Preferably, the intermediate hardware includes a connected intermediate sleeve and a pole connector, the intermediate sleeve is sleeved on the middle part of the first core rod, and the pole connector is vertically connected to the intermediate sleeve for fixing the first cross arm on the pole.

[0008] Preferably, the shape and size of the inner wall of the intermediate sleeve match the cross section of the first core rod.

[0009] Preferably, the pole connector includes two first connectors, which are vertically connected to the middle of the intermediate sleeve and are respectively located on both sides of the axial direction of the intermediate sleeve. The first connectors are used to connect the pole.

[0010] Preferably, the first connecting member includes a first plate and two second plates, the first plate and the second plate are vertically connected, and the two second plates extend in the same direction from both ends of the first plate in a direction away from the first plate, and the ends of the two second plates not connected to the first plate are vertically connected to the middle sleeve; a first connecting hole is provided on the second plate for connecting to the electric pole.

[0011] Preferably, the intermediate sleeve and the pole connector are connected by welding or integrally formed by casting.

[0012] Preferably, at least two threaded rods are connected to the side of the intermediate sleeve close to the pole, and the pole connector includes a third plate and a fourth plate connected vertically. The third plate is provided with at least two second connecting holes, and the threaded rods cooperate with the second connecting holes to connect the intermediate sleeve and the pole connector; the fourth plate is provided with several third connecting holes for connecting the pole.

[0013] Preferably, the middle sleeve and the threaded rod are connected by welding or integrally formed by casting; and the third plate and the fourth plate are connected by welding.

[0014] Preferably, the wire hanging fitting comprises an end sleeve and a slot structure connected to each other, the end sleeve is used to connect the end of the first core rod, and the slot structure is used to hang the wire.

[0015] Preferably, a first groove is provided on the top surface of the groove structure for placing the wire; a second groove is provided on the side wall ring of the groove structure for assisting in fixing the wire; and a lifting portion is provided at the bottom of the groove structure for lifting and installing the composite crossarm.

[0016] Preferably, the cross section of the first core rod is square.

[0017] Preferably, the first core rod is formed by pultrusion after being impregnated with epoxy resin through glass fiber or aramid fiber.

[0018] Preferably, the fourth plate comprises a main body connector and two connecting ears of equal length, wherein the two connecting ears are symmetrically connected to both sides of the main body connector at a certain angle to match the curvature of the outer periphery of the pole.

[0019] Preferably, the third connecting hole on the fourth plate member above the third plate member is a combination hole, which is formed by the intersection of a circular hole and a U-shaped hole, and the diameter of the circular hole is greater than the width of the U-shaped hole.

[0020] Preferably, the slot structure includes a first slot and a lifting portion arranged in sequence up and down, the first slot is a U-shaped slot for placing the wire, and the slot opening of the first slot opens upward; the lifting portion is a C-shaped slot, and the slot opening of the lifting portion opens outward away from the first core rod.

[0021] Preferably, the slot structure includes a gland, an ear piece, a fastener and a first slot base. The first slot base is provided with a first slot for placing the wire, and the bottom of the gland is provided with a second slot. The second slot is an arc-shaped slot for assisting in fixing the wire. The gland extends to both sides along the axial direction of the first core rod to form two ear pieces. The ear piece and the first slot base are connected by fasteners so that the gland can press and fix the wire.

[0022] Preferably, the slot structure includes a support block, a locking assembly, and a first slot, one end of the support block is connected to the other end of the end sleeve, one end of the first slot is connected to the other end of the support block, and a movable slot is provided on the side of the support block away from the end sleeve, and the movable slot is used to cooperate with the locking assembly to fix the wire.

[0023] Preferably, the locking assembly includes a locking bolt, a locking piece, a locking plate, and a locking nut. The locking bolt passes through the locking plate and the movable groove and is fixed in the movable groove by the locking nut. The locking piece can move along the locking bolt and lock to fix the wire between the locking piece and the first groove.

[0024] Preferably, the locking piece includes a movable block and a limit block connected to each other, and the movable block is provided with a movable hole for allowing the locking piece to move along the locking bolt and be locked by the locking nut; the limit block is connected to the outer periphery of the movable block, and the side of the limit block close to the wire is an arc-shaped surface.

[0025] The beneficial effects of this application are as follows: the composite crossarm of this application comprises a first crossarm and a second crossarm, which are separately arranged. The first crossarm comprises a first core rod, an intermediate hardware, a wire hanging hardware, and a first insulating layer. The composite crossarm has a simple overall structure, reliable strength, convenient installation, and low manufacturing cost. Furthermore, when the intermediate hardware of this application is connected to the first core rod, there is no need to drill a hole in the first core rod, thereby ensuring the mechanical properties and load-bearing capacity of the composite crossarm, extending the service life of the composite crossarm, and reducing overall costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG1 is a schematic diagram of the three-dimensional structure of a transmission pole 100 according to an embodiment of the present application;

[0027] FIG2 is a schematic diagram of the three-dimensional structure of an intermediate metal fitting 300 according to an embodiment of the present application;

[0028] FIG3 is a schematic diagram of the three-dimensional structure of a transmission pole 100 according to another embodiment of the present application;

[0029] FIG4 is a schematic perspective structural diagram of an intermediate sleeve 310 according to an embodiment of the present application;

[0030] FIG5 is a schematic diagram of the three-dimensional structure of a pole connector 320 according to an embodiment of the present application;

[0031] FIG6 is a schematic diagram of the three-dimensional structure of a wire hanging fitting 400 for hanging a wire according to an embodiment of the present application;

[0032] FIG7 is a schematic diagram of the three-dimensional structure of a wire hanging fitting 400 for hanging a wire according to another embodiment of the present application;

[0033] FIG8 is a schematic diagram of the three-dimensional structure of a wire hanging fitting 400 for hanging a wire according to another embodiment of the present application;

[0034] FIG9 is a schematic diagram of the three-dimensional structure of a wire hanging fitting 400 for hanging a wire according to another embodiment of the present application;

[0035] FIG10 is a schematic diagram of the three-dimensional structure of the wire hanging fitting 400 in FIG9 ;

[0036] FIG11 is a schematic perspective structural diagram of the locking member 4422 in FIG10 ;

[0037] FIG12 is a schematic diagram of the three-dimensional structure of a fixing bracket 530 according to an embodiment of the present application. DETAILED DESCRIPTION

[0038] 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.

[0039] Referring to FIG1 , the present application provides a transmission pole 100, comprising a pole 10 and a composite crossarm fixed to the pole 10, the composite crossarm being used to hang conductors. The composite crossarm comprises a first crossarm 200, which is fixed to the pole 10 in a horizontal direction. The first crossarm 200 comprises a first core rod 210 (marked in the figure for schematic purposes only), an intermediate fitting 300, two wire hanging fittings 400, and a first insulating layer 220. The intermediate fitting 300 is a cross-shaped fitting fixedly connected to the middle of the first core rod 210 and used to secure the first crossarm 200 to the pole 10; the two wire hanging fittings 400 are respectively connected to the two ends of the first core rod 210 and used to hang conductors; and the first insulating layer 220 covers at least a portion of the outer circumference of the first core rod 210. The first cross arm 200 has a simple overall structure and reliable strength. It is directly fixed to the pole 10 through the intermediate hardware 300, without the need to drill holes in the first core rod 210, thereby avoiding affecting the mechanical properties of the first core rod 210. The first insulating layer 220 on the outer surface of the first core rod 210 will not be worn due to long-term stress, thereby ensuring the mechanical properties and load-bearing capacity of the first cross arm 200 and extending its service life.

[0040] The first core rod 210 is made of a composite material, such as glass fiber or aramid fiber impregnated with epoxy resin and then pultruded. Compared to the metal materials used in traditional crossarms, composite materials are more corrosion-resistant, less expensive, and significantly lighter, making the first crossarm 200 easier to install. In this embodiment, the first core rod 210 has a square cross-section. In other embodiments, the cross-section of the first core rod can also be circular, T-shaped, or I-shaped, without limitation.

[0041] The first insulating layer 220 covers at least a portion of the outer circumference of the first core rod 210 and includes a sheath and sheds spaced apart from the sheath. Specifically, the first insulating layer 220 is located around the first core rod 210, excluding the intermediate fittings 300 and the wire hook fittings 400. Sealed connections are established between the first insulating layer 220 and the intermediate fittings 300, and between the first insulating layer 220 and the wire hook fittings 400, to protect the first core rod 210 from aging. The first insulating layer 220 is made of high-temperature vulcanized silicone rubber. This material is integrally injected and applied to the outer circumference of the first core rod 210, resulting in low cost and high efficiency. Alternatively, the coating can be performed using a molding process to form a single, integral high-temperature vulcanized silicone rubber insulation layer. Silicone rubber exhibits excellent aging resistance and hydrophobic migration properties, reducing the probability of pollution flashover and rain flashover, thereby improving the safety and reliability of the first crossarm 200.

[0042] The intermediate hardware 300 includes an integrally connected intermediate sleeve 310 and a pole connector 320. The intermediate sleeve 310 is a hollow tubular structure that is secured to the outer periphery of the first core rod 210. The intermediate sleeve 310 is positioned centrally within the first core rod 210. The pole connector 320 is perpendicularly connected to the intermediate sleeve 310 and secures the first crossarm 200 to the pole 10. The inner wall shape and dimensions of the intermediate sleeve 310 match the cross-section of the first core rod 210. Specifically, in this embodiment, the intermediate sleeve 310 is a square tube. This maximizes the contact area between the first core rod 210 and the intermediate sleeve 310, ensuring a more stable connection and improving the mechanical performance of the first crossarm 200. In other embodiments, the intermediate sleeve's cross-section may alternatively be a circular tube, a T-shaped tube, or an I-shaped tube, as long as it matches the cross-section of the first core rod. This is not a limitation.

[0043] 1 and 2 , in one embodiment, the pole connector 320 includes two first connectors 330 , which are vertically connected to the middle of the intermediate sleeve 310 and are respectively located on both axial sides of the intermediate sleeve 310 . The first connectors 330 are used to connect the pole 10 .

[0044] The first connector 330 includes a first plate 331 and two second plates 332. The two ends of the first plate 331 are perpendicularly connected to one end of the two second plates 332, and the two second plates 332 extend in the same direction away from the first plate 331. The other ends of the two second plates 332 not connected to the first plate 331 are perpendicularly connected to the intermediate sleeve 310. The first plate 331 and the two second plates 332 are connected by welding or integrally formed by casting, which simplifies manufacturing and ensures the mechanical strength of the first connector 330. The two second plates 332 are each provided with a first connection hole 333. The two first connection holes 333 are coaxially arranged and their penetration direction is perpendicular to the plate surface of the second plate 332. The pole 10 is provided with a first mounting hole (not shown) that corresponds to and matches the first connection hole 333.

[0045] The intermediate sleeve 310 and the pole connector 320 can be made of metal (e.g., iron, steel, aluminum, etc.), which is readily available and relatively low-cost. The intermediate sleeve 310 and the pole connector 320 are connected by welding or integrally formed by casting, simplifying manufacturing while ensuring a strong connection between the intermediate sleeve 310 and the pole connector 320.

[0046] When assembling the first crossarm 200, the intermediate sleeve 310 of the intermediate hardware 300 is sleeved on the middle position of the first core rod 210, and then the two hanging hardware 400 are sleeved on both ends of the first core rod 210, and the intermediate sleeve 310 and the hanging hardware 400 are fixed to the first core rod 210 by crimping. Of course, they can also be fixed by gluing, as long as a firm connection between the first core rod 210 and the intermediate sleeve 310 and the hanging hardware 400 can be achieved; then, a first insulating layer 220 is formed in the area of ​​the first core rod 210 not covered by the intermediate sleeve 310 and the hanging hardware 400. For example, a silicone rubber umbrella skirt can be formed by vacuum integral injection, so that the assembly of the first crossarm 200 can be achieved.

[0047] When installing the first cross arm 200 on the pole 10, the intermediate sleeve 310 is placed close to the pole 10 in the horizontal direction, and the two first connecting members 330 are placed in the vertical direction and are respectively located on the upper and lower sides of the intermediate sleeve 310. The first connecting member 330 is fixed to the pole 10 by inserting bolts or other fasteners through the first connecting holes 333 on the two second plates 332 of the first connecting member 330 and the corresponding first mounting holes on the pole 10, thereby fixing the first cross arm 200 on the pole 10. The installation is simple and efficient.

[0048] Referring to Figures 3 to 5, in another embodiment, the intermediate hardware 300 includes an intermediate sleeve 310 and a pole connector 320 fixedly connected to each other. The intermediate sleeve 310 and the pole connector 320 are separately arranged. At least two threaded rods 311 are connected to the side of the intermediate sleeve 310 close to the pole 10. The two threaded rods 311 are arranged in parallel and spaced apart at both ends of the intermediate sleeve 310 close to the pole 10. The axes of the two threaded rods 311 and the axis of the intermediate sleeve 310 are located in the same horizontal plane and are perpendicular to each other.

[0049] The pole connector 320 includes a third plate 340 and a fourth plate 350 connected vertically. The third plate 340 is a rectangular plate with at least two second connection holes 341 for mating with the threaded rod 311. The fourth plate 350 has several third connection holes 351 for connecting to the pole 10. The pole 10 has second mounting holes (not shown) that correspond to the third connection holes 351.

[0050] In this embodiment, the cross-section of the pole 10 is circular. Accordingly, the fourth plate 350 includes a main connecting member 352 and two connecting ears 353 of equal length. The main connecting member 352 has a roughly U-shaped cross-section and is provided with a plurality of third connecting holes 351. The two connecting ears 353 are symmetrically connected to either side of the main connecting member 352 at a predetermined angle, resulting in a roughly "Ω"-shaped cross-section of the fourth plate 350. This allows the two connecting ears 353 to match the curvature of the outer circumference of the pole 10, thereby increasing the contact area between the fourth plate 350 and the pole 10 and thereby enhancing the connection strength between the two. Furthermore, when the fourth plate 350 is installed on the pole 10, the two connecting ears 353 are positioned closely against the pole 10. This leaves a certain amount of space between the U-shaped main connecting member 352 and the outer circumference of the pole 10, providing sufficient installation margin and improving installation convenience.

[0051] In this embodiment, the third connection holes 351 on the fourth plate 350 are distributed on the upper and lower sides of the third plate 340 to further stabilize the connection between the fourth plate 350 and the pole 10. In other embodiments, the number and position of the third connection holes can be adjusted according to the installation requirements of the first crossarm and are not specifically limited here.

[0052] The intermediate sleeve 310 and the pole connector 320 can be made of metal (e.g., iron, steel, aluminum, etc.), which is readily available and relatively low-cost. The intermediate sleeve 310 and the threaded rod 311 are connected by welding or integrally formed by casting, simplifying manufacturing while ensuring a strong connection between the intermediate sleeve 310 and the threaded rod 311. The third plate 340 and the fourth plate 350 of the pole connector 320 are connected by welding, simplifying manufacturing and ensuring a strong connection.

[0053] When installing the first cross arm 200 on the pole 10, the pole connector 320 is set close to the pole 10, and the third plate 340 is set in the horizontal direction, and the fourth plate 350 is set in the vertical direction. The two threaded rods 311 are respectively passed through the two second connection holes 341 on the third plate 340 and fixedly connected with nuts and other fasteners, so that the intermediate sleeve 310 and the pole connector 320 can be assembled, thereby realizing the assembly of the first cross arm 200; then, the pole connector 320 is fixed to the pole 10 by passing bolts and other fasteners through the third connection holes 351 on the fourth plate 350 of the pole connector 320 and the corresponding second mounting holes on the pole 10, thereby fixing the first cross arm 200 to the pole 10, which is simple to install and efficient.

[0054] Furthermore, in order to improve the installation convenience of the first crossarm 100, the third connecting hole 351 on the fourth plate 350 located above the third plate 340 can be a combination hole, which is formed by the intersection of a circular hole and a U-shaped hole, and the diameter of the circular hole is larger than the width of the U-shaped hole, so that when the fourth plate 350 is connected to the pole 10, a bolt or other fastener can be first screwed into the pole 10, and then the fourth plate 350 can be hung and fixed on the bolt, that is, the head of the bolt is penetrated by the circular hole with a slightly larger size in the combination hole, and then the rod of the fixing bolt is clamped by the U-shaped hole with a slightly smaller size in the combination hole. In this way, the pole connector 320 can be pre-fixed on the pole 10 through a simple hanging operation, which facilitates the installation of the first crossarm 200 and further improves the installation efficiency.

[0055] Referring to Figures 6 to 9 , the wire hanging fitting 400 includes an end sleeve 410 and a slot structure 420. One end of the end sleeve 410 is connected to the end of the first core rod 210, and the other end of the end sleeve 410 is connected to the slot structure 420. The inner wall shape of the end sleeve 410 corresponds to the cross-section of the first core rod 210 and is sized accordingly. The end sleeve 410 can be connected to the first core rod 210 through a crimping process, and the slot structure 420 is used to hang the wire.

[0056] The wire hanging fitting 400 can be made of metal (e.g., iron, steel, aluminum, etc.), which is readily available and relatively low in cost. The end sleeve 410 and the slot structure 420 are connected by welding or integrally formed by casting, which simplifies manufacturing and ensures the strength of the connection between the end sleeve 410 and the slot structure 420.

[0057] Referring to Figure 6, in one embodiment, the wire hanging fitting 400 is a deep-groove fitting comprising a connected end sleeve 410 and a groove structure 420. The groove structure 420 comprises a first groove 421 and a lifting portion 422, arranged in a top-to-bottom arrangement. The first groove 421 is a U-shaped groove for accommodating the wire, with the groove opening of the first groove 421 facing upward. The lifting portion 422 is a C-shaped groove for accommodating the first crossarm 200 via a rope or other tool, with the groove opening of the lifting portion 422 facing outward away from the first core rod 210. The arc of the bottom of the first groove 421 is adapted to the outer diameter of the wire, and the depth of the first groove 421 is greater than the outer diameter of the wire placed therein. This ensures that the wire is securely fixed to the bottom of the first groove 421, preventing it from slipping or deviating, effectively preventing wear and tear on the wire, and extending its service life. The wire can be secured in the first groove 421 by means of binding straps or other means. The hoisting portion 422 also serves as a threading port for the wire-securing binding tape. The C-shaped groove structure limits the binding tape inserted into the hoisting portion 422, effectively preventing it from falling outward and ensuring that the wire can be securely held in the first groove 421. The width of the first groove 421 and the hoisting portion 422 along the wire extension direction is smaller than the width of the end sleeve 410, which reduces the weight of the wire-securing hardware 400 while ensuring effective wire-securing performance, thus lowering costs.

[0058] Referring to FIG7 , in another embodiment, the wire hanging fitting 400 is a top-groove fitting comprising a connected end sleeve 410 and a groove structure 420. The top surface of the groove structure 420 is provided with a first groove 424, an arcuate groove for accommodating the wire. The first groove 424 is arranged perpendicular to the axial direction of the first core rod 210. The wire can be secured in the first groove 424 by means of a binding strap, etc. The first groove 424 is formed as an inwardly concave semi-cylinder, which increases the contact area between the first groove 424 and the wire, thereby firmly securing the wire in the first groove 424. A second groove 423 is provided around the sidewall of the groove structure 420. The second groove 423 is an arcuate groove for assisting in securing the wire. Specifically, a binding strap for securing the wire can be wrapped around the second groove 423 to prevent the binding strap from slipping and causing the wire to deviate, thereby ensuring secure wire placement. A hoisting portion 427 is provided at the bottom of the groove structure 420, and a hook hole is provided on the hoisting portion 427 to meet the hoisting requirements, that is, to be used for hoisting and installing the first cross arm 200 by means of ropes and other tools. The width of the hoisting portion 427 along the extension direction of the conductor is smaller than the width of the end sleeve 410, which can reduce the weight of the wire hanging hardware 400 while ensuring the wire hanging effect, thereby reducing costs.

[0059] Referring to Figure 8 , in another embodiment, the wire hanging fitting 400 is a gland-type fitting, comprising a connected end sleeve 410 and a slot structure 420. The slot structure 420 comprises a gland 431, tabs 432, a fastener 433, and a first slot base 435. The first slot base 435 is provided with a first slot adapted to the outer diameter of the conductor for receiving the conductor. The bottom of the gland 431 is provided with a second slot 434, an arc-shaped slot that assists in securing the conductor. Both the first and second slots 434 are oriented perpendicular to the axial direction of the first core rod 210, providing a more secure placement of the conductor. The gland 431 extends along the axial direction of the first core rod 210 to form two tabs 432. The tabs 432 can be integrally formed with the gland 431, or welded or bonded to the gland 431. The tab 432 and first slot base 435 are connected by fasteners 433, allowing the gland 431 to compress and secure the wire. Specifically, the fasteners 433 are mating screws and nuts. The first slot base 435 is provided with a screw hole that mates with the screw, and the tab 432 is provided with a through hole that mates with the screw hole. To install the wire, the wire is placed into the first slot of the first slot base 435. The gland 431 is placed over the wire so that the second slot 434 of the gland 431 abuts against the top of the wire and compresses the wire. The screw is then passed through the through hole of the tab 432 and tightened into the screw hole of the first slot base 435, securing the gland 431 to the first slot base 435, thereby securely attaching the wire to the first slot. A hanging portion 427 is provided at the bottom of the slot structure 420. The structure and purpose of the hanging portion 427 are as described above and will not be further elaborated.

[0060] 9-11 , in another embodiment, the wire hanging fitting 400 is a slot-type fitting, comprising a connected end sleeve 410 and a slot structure 420, the slot structure 420 comprising a support block 441, a locking assembly 442, and a first slot 443, one end of the support block 441 is connected to the other end of the end sleeve 410, the longitudinal axis (or longitudinal center axis direction) of the support block 441 is perpendicular to the axial direction of the end sleeve 410, one end of the first slot 443 is connected to the other end of the support block 441, specifically, one end of the first slot 443 is connected to one side of the other end of the support block 441, the plane where the opening of the first slot 443 is located is perpendicular to the longitudinal axis of the support block 441, that is, the plane where the opening of the first slot 443 is located is parallel to the axial direction of the end sleeve 410; the locking assembly 442 is arranged on the support block 441 to fix the wire in the first slot 443. When the wire hanging fitting 400 of the first cross arm 100 adopts a slot-type fitting, the axial direction of the end sleeve 410 is horizontally set, so that the plane where the opening of the first slot 443 is located is a horizontal plane, that is, the bottom of the first slot 443 is horizontally set to hang the wire; when the wire hanging fitting 400 of the second cross arm 500 adopts a slot-type fitting, the axial direction of the end sleeve 410 is vertically set, so that the plane where the opening of the first slot 443 is located is also vertically set, that is, the bottom of the first slot 443 is vertically set to hang the wire.

[0061] The other end of the support block 441 is provided with a movable groove 4411, that is, the movable groove 4411 is provided on the side of the support block 441 away from the end sleeve 410, which is used to cooperate with the locking assembly 442 to fix the wire. The locking assembly 442 includes a locking bolt 4421, a locking member 4422, a locking plate 4423, and a locking nut. The locking member 4422 is disposed in the movable groove 4411 and can move along the movable groove 4411 to adjust its position, thereby clamping the wire. The locking plate 4423 is disposed at the end of the support block 441 to cover one end of the movable groove 4411. The locking bolt 4421 passes through the locking plate 4423 and the locking member 4422 and extends out of the other end of the movable groove 4411. It is then fixed in the movable groove 4411 by the locking nut. The locking member 4422 can move along the locking bolt 4421 and lock, thereby fixing the wire between the locking member 4422 and the first groove 443.

[0062] The locking piece 4422 includes a movable block 44221 and a limit block 44222 which are connected to each other. The movable block 44221 is arranged in the movable groove 4411. The movable block 44221 is provided with a penetrating movable hole 44224 for passing the locking bolt 4421. The inner surface of the movable hole 44224 and the outer surface of the locking bolt 4421 are provided with matching threads, so that the locking piece 4422 can move along the locking bolt 4421 and be locked by the locking nut; the limit block 44222 is connected to the outer periphery of the movable block 44221, and the side of the limit block 44222 close to the wire is an arc-shaped surface. The arc-shaped surface can increase the contact area between the limit block 44222 and the wire, so that the wire is firmly clamped between the locking piece 4422 and the first groove 443. Furthermore, the locking member 4422 also includes a reinforcement block 44223, which is a triangular block structure and is connected to the moving block 44221 and the limit block 44222 at the same time, thereby improving the overall strength of the locking member 4422. After the locking assembly 442 is installed to fix the wire, the bottom surface of the reinforcement block 44223 abuts against both sides of the moving groove 4411, which can further limit the relative position of the locking member 4422 and the moving groove 4411, thereby preventing the wire from shaking when subjected to external forces such as wind loads, thereby preventing the locking member 4422 from loosening.

[0063] The first groove 443 is a C-shaped groove, which is a semi-cylindrical groove, and the two sides of the C-shaped groove are outward-expanding arc structures, and the distance between the two sides gradually increases. That is, when an imaginary circle is drawn at different positions of the C-shaped groove, the diameter of the two sides of the C-shaped groove is larger than the diameter of the middle part. This structure can be used not only for hanging straight conductors in transmission lines, but also for hanging conductors bent at the corners of transmission lines, and has a wider range of applications.

[0064] When hanging a wire, first place the wire in the first slot 443. Then, adjust the relative positions of the locking member 4422 and the locking bolt 4421 according to the specifications of the wire so that the limit block 44222 of the locking member 4422 abuts the wire. Then, securely connect the locking bolt 4421 to the support block 441 via the locking nut, thereby firmly clamping the wire between the locking member 4422 and the first slot 443. This method of securing the wire is simple to operate, provides greater flexibility in wire hanging, and allows for hanging wires of different specifications, thus expanding its applicability.

[0065] Furthermore, the support block 441 is connected to two lifting parts 444 on both sides along its axial direction. The lifting parts 444 are semi-cylindrical structures. The central axes of the two lifting parts 444 are parallel to the axis of the locking bolt 4421 and the longitudinal axis of the support block 441. A through hole 4441 is provided on the central axis of each lifting part 444, which can be used to lift and install the first crossbeam 200 by tools such as ropes, and the two through holes 4441 of the two lifting parts 444 can also cooperate with each other to connect electrical assembly parts such as adapters.

[0066] Continuing with FIG1 , the composite crossarm further includes a second crossarm 500, which is vertically fixed to the pole 10 and positioned above the first crossarm 200. The first crossarm 200 and the second crossarm 500 are separately disposed. The second crossarm 500 is fixed to the pole 10 via a fixing bracket 530. The second crossarm 500 includes a second core rod 510 (the markings in the figure are for schematic purposes only), a second insulating layer 520, a wire hanging fitting 400, and a bottom connecting fitting 540. The second insulating layer 520 covers at least a portion of the outer circumference of the second core rod 510. The wire hanging fitting 400, similar to the wire hanging fitting 400 in the first crossarm 200, is connected to the top of the second core rod 510 and is used to fix the conductor. The bottom connecting fitting 540 is connected to the bottom end of the second core rod 510 and is used to fix the second crossarm 500 to the fixing bracket 530. The simultaneous provision of the first crossarm 200 and the second crossarm 500 allows the composite crossarm to be used for the installation of a single-circuit, three-phase transmission line. In other embodiments, the composite crossarm may include only three first crossarms, allowing the composite crossarm to be used for the installation of a dual-circuit, six-phase transmission line. The three first crossarms are arranged vertically and parallel to each other on the pole. The wire hanging fittings at both ends of each first crossarm can be used to hang a transmission line, thereby forming six wire hanging points to meet the requirements of dual-circuit transmission.

[0067] The second core rod 510 is made of a composite material, such as glass fiber or aramid fiber impregnated with epoxy resin and then pultruded. Compared to the metal materials used in traditional crossarms, composite materials are more corrosion-resistant and cost-effective, thereby reducing the weight of the second crossarm 500. In this embodiment, the cross-section of the second core rod 510 is circular. In other embodiments, the cross-section of the second core rod 510 may also be square, T-shaped, or I-shaped, without limitation.

[0068] The second insulating layer 520, covering the second core rod 510, comprises a sheath and sheds spaced apart from the sheath. Specifically, the second insulating layer 520 is located around the second core rod 510, excluding the wire hook fitting 400 and the bottom connecting fitting 540. Sealed connections are established between the second insulating layer 520 and the wire hook fitting 400, and between the second insulating layer 520 and the bottom connecting fitting 540, to protect the second core rod 510 from aging. The second insulating layer 520 is made of high-temperature vulcanized silicone rubber. This material is integrally injected and applied to the outer periphery of the second core rod 510, resulting in low cost and high efficiency. Alternatively, the coating can be performed using a molding process to form a single silicone rubber insulating layer. Furthermore, the silicone rubber material exhibits excellent aging resistance and hydrophobic migration properties, reducing the probability of pollution flashover and rain flashover, thereby improving the safety and reliability of the second crossarm 500.

[0069] The bottom connection fitting 540 comprises a connected bottom sleeve and base. The bottom sleeve is designed to be fixedly mounted on the outer circumference of the second core rod 510. The shape and size of the inner wall of the bottom sleeve match the cross-section of the second core rod 510. The bottom sleeve and the second core rod 510 are connected by a crimping process. The base is provided with a bottom connection hole (not shown) for connecting to the fixing bracket 530.

[0070] Referring to Figure 12 , the fixing bracket 530 includes a first connecting portion 531 and a second connecting portion 532. The first connecting portion 531 and the second connecting portion 532 are integrally formed using a casting process or connected using a welding process, which simplifies manufacturing and ensures the connection strength between the first connecting portion 531 and the second connecting portion 532. The fixing bracket 530 can be made of a metal (e.g., iron, steel, aluminum, etc.), which is easily available and low in cost. The first connecting portion 531 includes a horizontal plate that is used to connect to the second crossarm 500, allowing the second crossarm 500 to be vertically fixed above the pole 10. The horizontal plate of the first connecting portion 531 is provided with fourth connecting holes 533, which correspond to the bottom connecting holes on the bottom connecting fitting 540 of the second crossarm 500. Bolts or other fasteners are inserted through the fourth connecting holes 533 and the corresponding bottom connecting holes to secure the bottom connecting fitting 540 to the fixing bracket 530, thereby securing the second crossarm 500 to the fixing bracket 530. This facilitates installation and improves efficiency. The second connecting portion 532 comprises a vertical plate, which is perpendicularly connected to the horizontal plate and is provided with a plurality of fifth connecting holes 534 for connecting to the pole 10. The pole 10 is provided with a third mounting hole (not shown) corresponding to the fifth connecting hole 534. Fasteners such as bolts are inserted through the fifth connecting hole 534 on the vertical plate of the fixing bracket 530 and the corresponding third mounting hole on the pole 10 to secure the fixing bracket 530 to the pole 10, thereby securing the second crossarm 500 to the pole 10. This simplifies installation and improves efficiency. Furthermore, several reinforcements 535 can be provided between the horizontal plate of the first connecting portion 531 and the vertical plate of the second connecting portion 532. These reinforcements connect both the horizontal and vertical plates, thereby increasing the overall mechanical strength of the fixing bracket 530 and ensuring a secure connection between the second crossarm 500 and the pole 10.

[0071] The composite crossarm of the present application includes a first crossarm 200 and a second crossarm 500 that are separately arranged. The first crossarm 200 is arranged horizontally, and two-phase conductors are hung at both ends of the first crossarm 200. The second crossarm 500 is arranged vertically, and a single-phase conductor is hung at the top of the second crossarm 500, so that the composite crossarm can be used to install single-circuit three-phase transmission lines. The overall structure of the composite crossarm is simple, the strength is reliable, the installation is convenient, and the manufacturing cost is low. At the same time, when the intermediate hardware 300 of the first crossarm 200 of the present application is connected to the first core rod 210, there is no need to drill the first core rod 210, which ensures the mechanical properties and load-bearing capacity of the composite crossarm, extends the service life of the composite crossarm, and reduces the overall cost.

[0072] 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, which is used to be fixed on a utility pole for hanging conductors. It is characterized in that it includes a first cross arm, and the first cross arm includes: a first core rod; an intermediate fitting, the intermediate fitting is a cross-shaped fitting, and the intermediate fitting is connected to the middle part of the first core rod for fixing the first cross arm on the utility pole; two wire hanging fittings, which are respectively connected to both ends of the first core rod for hanging the conductors; a first insulating layer, and the first insulating layer covers at least part of the outer peripheral surface of the first core rod.

2. The composite cross arm according to claim 1, It is characterized in that the composite cross arm further includes a second cross arm, the first cross arm is fixed on the utility pole in the horizontal direction, the second cross arm is fixed on the utility pole in the vertical direction and is located above the first cross arm, and the first cross arm and the second cross arm are separated.

3. The composite cross arm according to claim 1, It is characterized in that the intermediate fitting includes a connected intermediate sleeve and a utility pole connecting piece, the intermediate sleeve is sleeved on the middle part of the first core rod, and the utility pole connecting piece is vertically connected to the intermediate sleeve for fixing the first cross arm on the utility pole.

4. The composite cross arm according to claim 3, It is characterized in that the inner wall shape and size of the intermediate sleeve match the cross section of the first core rod.

5. The composite cross arm according to claim 3, It is characterized in that at least two threaded rods are connected to one side of the intermediate sleeve close to the utility pole, the utility pole connecting piece includes a third plate member and a fourth plate member connected vertically, at least two second connection holes are provided on the third plate member, and the threaded rods cooperate with the second connection holes to connect the intermediate sleeve and the utility pole connecting piece; a number of third connection holes are provided on the fourth plate member for connecting the utility pole.

6. The composite cross arm according to claim 5, It is characterized in that the intermediate sleeve and the threaded rods are connected by a welding process or integrally formed by a casting process; the third plate member and the fourth plate member are connected by a welding process.

7. The composite cross arm according to claim 1, It is characterized in that the wire hanging fitting includes a connected end sleeve and a groove structure, the end sleeve is used to connect the end of the first core rod, and the groove structure is used to hang the conductors.

8. The composite cross arm according to claim 7, It is characterized in that a first groove is provided on the top surface of the groove structure for placing the conductors; a second groove is annularly provided on the side wall of the groove structure for assisting in fixing the conductors; a hoisting part is provided at the bottom of the groove structure for hoisting and installing the composite cross arm.

9. The composite cross arm according to claim 1, It is characterized in that the cross section of the first core rod is square.

10. The composite cross arm according to claim 1, It is characterized in that the first core rod is formed by pultrusion after impregnating glass fiber or aramid fiber with epoxy resin.

11. The composite cross arm according to claim 5, It is characterized in that The fourth plate member includes a body connecting member and two connecting ears of equal length. The two connecting ears are symmetrically connected to both sides of the body connecting member at a certain included angle for matching the radian of the outer periphery of the pole.

12. The composite cross arm according to claim 5, wherein, the third connecting hole on the fourth plate member above the third plate member is a combined hole formed by partial intersection of a round hole and a U-shaped hole, and the diameter of the round hole is greater than the width of the U-shaped hole.

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