Double-circuit strain-damping rod light-weight cross arm structure and manufacturing process thereof

Abstract

The application discloses a kind of double-loop strain rod light weight cross arm structure and manufacturing process thereof, belong to double-loop cross arm technical field, the double-loop strain rod light weight cross arm structure of this kind includes cross arm and insulator, insulator is symmetrically installed on the surface of cross arm, cross arm is adapted to the support working condition of upper support type conductor on strain rod, adopts eccentric gradient wall thickness section of thick bottom thin, the thickening layer is provided at the bottom of cross arm, cross arm is based on the force partition difference and is provided with reinforcing rib and hollowed-out weight-reducing area, the hollowed-out cavity weight-reducing of the middle section of the cavity in the application is arranged, trapezoidal compression reinforcing rib is arranged vertically through in cavity, the bottom of rib body is integrally consolidated with lower wall thickening layer, specially resist the compression buckling failure of lower wall caused by horizontal tension, segmented difference is strengthened logic is used: root, end high stress area retains arc-shaped tensile reinforcing rib, middle section low stress area cancels tensile rib, opens cavity, realize the gradient matching design of "stress strong area is strengthened, stress weak area is reduced".

Description

Technical Field

[0001] This invention relates to the field of dual-circuit crossarm technology, and in particular to a lightweight dual-circuit tension bar crossarm structure and its manufacturing process. Background Technology

[0002] In 10kV distribution network double-circuit tension transmission lines, the crossarm, as the core load-bearing component that carries conductor tension and supports insulators, directly determines the line's operational safety and life-cycle maintenance costs based on its structural strength, self-weight, insulation performance, and installation stability. Currently, the industry mainly adopts two types of structures for double-circuit tension pole crossarms: traditional steel angle steel crossarms and ordinary equal-section composite insulated crossarms. Both have significant technical defects when adapted to the top-supported conductor support conditions, making it difficult to simultaneously meet the engineering requirements of lightweight, high load-bearing capacity, maintenance-free operation, and convenient installation.

[0003] Existing composite crossarms generally adopt a uniform structure with equal wall thickness and cross-section, without structural optimization for the eccentric stress characteristics of top-supported tension conductors. Under top-supported conditions, the crossarm exhibits a bidirectional eccentric bending moment distribution with compression at the bottom and tension at the top. High stress concentration only exists in the root clamping section and the end support section, while the stress level in the middle section is extremely low. Conventional uniform cross-section composite crossarms cannot distinguish between areas of strong and weak stress, and generally suffer from insufficient strength in the stress area and serious material redundancy in the non-stress area, making it impossible to achieve the optimal match between strength and self-weight. Summary of the Invention

[0004] The purpose of this invention is to provide a lightweight crossarm structure with dual-circuit tension rod and its manufacturing process, which solves the problem that conventional composite crossarms with uniform cross-sections cannot distinguish between areas of strong and weak stress, and generally have insufficient strength in the stress area and serious material redundancy in the non-stress area, thus failing to achieve the optimal match between strength and self-weight.

[0005] To achieve the above objectives, the present invention provides a lightweight crossarm structure for a dual-circuit tension rod, comprising a crossarm and insulators. The insulators are symmetrically installed on the surface of the crossarm, and six insulators are arranged to form a dual circuit. The crossarm is adapted to the working condition of the tension rod with an upper-support conductor, and adopts an eccentric gradient wall thickness section with a thicker bottom and a thinner top. A thickened layer is provided at the bottom of the crossarm to improve its compressive strength. The crossarm is equipped with reinforcing ribs and hollow weight-reducing zones based on the stress zones. The high-stress main stress zone of the crossarm has an integrally formed arc-shaped tensile reinforcing rib, and the low-stress zone of the crossarm has a hollow cavity for weight reduction. Trapezoidal compressive reinforcing ribs are arranged in the hollow cavity.

[0006] Preferably, the arc-shaped tensile reinforcement is an upwardly convex arc-shaped strip structure. The arc-shaped tensile reinforcement is segmented and is only provided in the crossbeam clamping section and the end support section. The arc-shaped tensile reinforcement is removed from the middle section of the crossbeam and a hollow cavity is opened.

[0007] Preferably, the bottom edge of the trapezoidal compressive reinforcing rib is integrally fixed to the inner wall of the thick lower wall of the crossarm, and the vertical edge extends upward toward the hollow cavity area and penetrates the hollow cavity to resist the continuous compressive stress on the lower wall generated by the horizontal tension of the upper support conductor and prevent the lower wall of the crossarm from buckling and deforming.

[0008] Preferably, a clamp is installed at the root of the crossarm, and a root reinforcing rib is provided between the root of the crossarm and the clamp.

[0009] Preferably, the crossarm is divided into a root clamping section, a middle weight-reducing section, and an end support platform section along the axial direction; the hollow cavity of the root clamping section is reduced in size, while retaining the arc-shaped tensile reinforcement, and in conjunction with the root reinforcement, it is adapted to the clamping stress and composite bending moment, and the hollow cavity is filled with a high-density closed-cell pressure-resistant core; the middle weight-reducing section eliminates the arc-shaped tensile reinforcement and opens a hollow cavity; the end support platform section restores the arc-shaped tensile reinforcement and locally thickens the upper and lower walls to adapt to the concentrated upward pulling force of the insulator.

[0010] Preferably, the crossarm is manufactured using a continuous wet-winding process, with trapezoidal compressive reinforcement and arc-shaped tensile reinforcement wound and solidified with the crossarm in a single winding, without secondary bonding or welding. The crossarm adopts a zoned differentiated fiber layup design, with trapezoidal compressive reinforcement and thickened layer high proportion of circumferential glass fiber to improve compressive buckling performance; arc-shaped tensile reinforcement high proportion of axial glass fiber to improve tensile bearing capacity; and reduced fiber layup in the hollow cavity area of ​​the middle section to meet lightweight design requirements.

[0011] Preferably, the two clamps on both sides are fastened together by bolts. The clamps are also provided with an adaptive clamping assembly, which includes a central clamping block and a lateral clamping block. The central clamping block is movably disposed on the side wall of the clamp. A wedge-shaped drive block is fixedly installed at one end of the central clamping block. A movable block is also symmetrically slidably installed in the clamp. The lateral clamping block is fixedly installed at one end of the movable block.

[0012] Preferably, a spring is fixedly installed at one end of the wedge-shaped drive block, and the other end of the spring is fixedly connected to the inner wall of the clamp, for pushing the middle clamp block out.

[0013] Preferably, one end of the moving block is provided with an arc-shaped extrusion part, and a lifting block is symmetrically slidably installed in the clamp. One end of the lifting block is provided with a wedge-shaped part, which is adapted to the wedge-shaped driving block. The other end of the lifting block is provided with an arc-shaped block for extruding the arc-shaped extrusion part.

[0014] A manufacturing process for a lightweight crossarm with dual-circuit tension rod, applicable to the aforementioned lightweight crossarm structure with dual-circuit tension rod, includes the following steps: S1: Tooling assembly and raw material pretreatment; the root, middle and end sections of the split core mold are connected and assembled, the overall contour is calibrated, the eccentric gradient section design is matched, the impregnated glass fiber yarn and epoxy resin system are configured in different areas, the two types of substrates, high compressive circumferential glass fiber and high tensile axial glass fiber are distinguished, the resin content is controlled at 28% to 32%, and the interlayer bonding strength and outdoor weather resistance are guaranteed. S2: Winding molding; employing a wet continuous winding process, relying on a special variable cross-section core mold to form the overall matrix and built-in reinforcing structure in one step: firstly, a thickened layer is formed by winding multiple layers of circumferential glass fiber, which is then cured to form a trapezoidal compressive reinforcing rib; subsequently, the sidewall is formed, and the upper and lower corner areas of the sidewall are thickened to form transition ribs, while the middle section is reduced in layup to achieve a hollow structure in accordance with the mold outline; finally, the top structure is formed in segments with differentiated molding, and axial glass fiber is wound in the arc-shaped groove area of ​​the core mold at the root and end to form an upwardly convex arc-shaped tensile reinforcing rib, while no tensile ribs are placed in the groove-free area of ​​the middle section; S3: Overall curing and shaping; local reinforcement is carried out for high stress areas. High-density closed-cell anti-compression foam core is injected only into the hollow cavity of the clamping section to improve local anti-compression performance. The middle section of the crossbeam is kept completely hollow to reduce weight. The molded component is first pre-cured at room temperature for 2 hours to complete the initial shaping, and then sent to the drying room at 60-70℃ for constant temperature curing for 4 hours to eliminate the internal stress of the component. After curing, the segmented core mold is disassembled. S4: Finishing and corrosion protection; the two ends of the crossarm are cut flat, the clamp assembly bevel is processed, and the entire crossarm is sprayed with weather-resistant and insulating topcoat to complete the anti-corrosion, insulation and weather-resistant treatment, and the finished component is obtained.

[0015] The advantages and positive effects of the dual-loop tension bar lightweight crossarm structure and its manufacturing process described in this invention are as follows: 1. The present invention features a hollow cavity in the middle section of the crossarm to reduce weight. Trapezoidal compressive reinforcing ribs are arranged vertically through the cavity. The bottom of the ribs is integrally fixed with the thickened layer of the lower wall, which is specifically designed to resist the buckling failure of the lower wall caused by horizontal tension. A segmented differentiated reinforcement logic is adopted: the high stress areas at the root and end retain the arc-shaped tensile reinforcing ribs, while the tensile ribs are removed and the cavity is opened in the low stress area of ​​the middle section, so as to achieve a gradient matching design of "strengthening the strong stress area and reducing the weight of the weak stress area".

[0016] 2. This invention eliminates unnecessary materials to the maximum extent while retaining the core load-bearing structure by hollowing out the middle section, removing redundant arc-shaped tensile reinforcements in the middle section, and reducing the amount of plying in the low-stress area. Compared with traditional angle steel crossarms, it reduces weight by more than 60%, and compared with ordinary uniform cross-section composite crossarms, it reduces weight by 25% to 35%, effectively reducing the vertical load on the tower and the wind vibration load on the line, and improving the overall wind resistance and stability of the line.

[0017] 3. The present invention has a built-in spring pre-tightening wedge linkage adaptive clamping component. In the initial assembly state, the spring pushes the central clamping block out of the inner circle of the clamp, realizing the pre-positioning of the pole in high-altitude operation. During the bolt locking and clamping process, the pole body squeezes the central clamping block inward, and the wedge structure drives the lateral clamping blocks on both sides to expand outward, forming a three-point three-dimensional adaptive clamping, which automatically compensates for the roundness error of the pole and the installation gap, and greatly improves the vibration resistance, anti-slip and anti-loosening performance under tension conditions.

[0018] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0019] Figure 1 An overall perspective view provided for an embodiment of the present invention; Figure 2 A side view of the crossarm provided for an embodiment of the present invention; Figure 3 A perspective view of the crossarm provided for an embodiment of the present invention; Figure 4 A cross-sectional view of the crossarm provided for an embodiment of the present invention; Figure 5 Provided for the embodiments of the present invention Figure 4 Enlarged view of point A in the middle; Figure 6 An exploded view of the adaptive clamping assembly provided for an embodiment of the present invention.

[0020] Figure Labels 1. Crossarm; 2. Insulator; 3. Clamp; 4. Bolt; 5. Thickened layer; 6. Arc-shaped tensile reinforcement; 7. Root reinforcement; 8. Hollow cavity; 9. Trapezoidal compressive reinforcement; 10. Adaptive clamping assembly; 1001. Middle clamping block; 1002. Wedge-shaped drive block; 1003. Spring; 1004. Moving block; 1005. Lateral clamping block; 1006. Arc-shaped extrusion section; 1007. Lifting block; 1008. Arc-shaped block. Detailed Implementation

[0021] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] In this application, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. In case of any inconsistency, the meaning set forth in this specification or derived from the content described herein shall prevail. Furthermore, the terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit the scope of this application.

[0023] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0024] Reference Figures 1-6 As shown, the present invention provides a technical solution: a lightweight crossarm structure for a dual-circuit tension rod, including a crossarm 1 and insulators 2. The insulators 2 are symmetrically installed on the surface of the crossarm 1, and six insulators 2 are arranged to form a dual circuit. The crossarm 1 is adapted to the working condition of the tension rod with the upper support of the conductor. It adopts an eccentric gradient wall thickness section with a thicker bottom and a thinner top. A thickened layer 5 is provided at the bottom of the crossarm 1 to improve the compressive strength and the compressive buckling strength of the lower part of the crossarm 1. The crossarm 1 is equipped with reinforcing ribs and hollow weight-reducing areas based on the stress zone differentiation. The high-stress main stress zone of the crossarm 1 is integrally formed with an arc-shaped tensile reinforcing rib 6. The arc-shaped tensile reinforcing rib 6 is an upwardly convex arc-shaped strip structure. The arc-shaped tensile reinforcing rib 6 is segmented and is only set in the clamping section and the end support section of the crossarm 1.

[0025] Reference Figures 1-6 As shown, a hollow cavity 8 is provided in the low-stress area of ​​the crossarm 1 to reduce weight. The arc-shaped tensile reinforcing rib 6 is removed in the middle section of the crossarm 1 and a hollow cavity 8 is provided. A trapezoidal compressive reinforcing rib 9 is arranged in the hollow cavity 8. The bottom edge of the trapezoidal compressive reinforcing rib 9 is integrally fixed to the inner wall of the thick lower wall of the crossarm 1, and the vertical edge extends upward toward the hollow cavity 8 area and penetrates the hollow cavity 8. It is used to resist the continuous compressive stress on the lower wall generated by the horizontal tension of the upper support conductor and prevent the lower wall of the crossarm 1 from buckling and deforming.

[0026] Reference Figures 1-6 As shown, a clamp 3 is installed at the root of the crossarm 1, which locks the crossarm 1 to the pole. A root reinforcing rib 7 is provided between the root of the crossarm 1 and the clamp 3. The crossarm 1 is divided into a root clamping section, a middle weight-reducing section, and an end support platform section along the axial direction. The hollow cavity 8 of the root clamping section is reduced in size, while the arc-shaped tensile reinforcing rib 6 is retained. Together with the root reinforcing rib 7, it adapts to the compressive stress and composite bending moment of the clamp 3. The hollow cavity 8 is filled with a high-density closed-cell pressure-resistant core, which further improves the root's resistance to compression and collapse. The arc-shaped tensile reinforcing rib 6 is removed in the middle weight-reducing section, and a hollow cavity 8 is opened. The arc-shaped tensile reinforcing rib 6 is restored in the end support platform section, and the upper and lower walls are locally thickened to adapt to the concentrated upward pulling force of the insulator 2 and improve the end bearing stability.

[0027] Reference Figures 1-6 As shown, the crossarm 1 is made of fiber wet continuous winding integral molding process. The trapezoidal compressive strengthening rib 9 and the arc-shaped tensile strengthening rib 6 are wound and solidified with the crossarm 1 in one step without secondary bonding or welding. The crossarm 1 adopts a zoned differentiated fiber layup design. The trapezoidal compressive strengthening rib 9 and the thickened layer 5 are laid with circumferential glass fiber in a high proportion to improve compressive buckling performance. The arc-shaped tensile strengthening rib 6 is laid with axial glass fiber in a high proportion to improve tensile bearing capacity. The fiber layup in the hollow cavity area of ​​the middle section is reduced to meet the requirements of lightweight design.

[0028] Reference Figures 1-6 As shown, the two clamps 3 are fastened together by bolts 4. The clamps 3 are also equipped with an adaptive clamping assembly 10, which realizes the functions of adaptive fitting of the outer diameter of the pole, pre-positioning installation and multi-point balanced clamping and anti-loosening. The adaptive clamping assembly 10 includes a central clamping block 1001 and a lateral clamping block 1005. The central clamping block 1001 is movably set on the side wall of the clamp 3. A wedge-shaped drive block 1002 is fixedly installed at one end of the central clamping block 1001. A moving block 1004 is also symmetrically slidably installed in the clamp 3. The lateral clamping block 1005 is fixedly installed at one end of the moving block 1004. A spring 1003 is fixedly installed at one end of the wedge-shaped drive block 1002. The other end of the spring 1003 is fixedly connected to the inner wall of the clamp 3 to push the central clamping block 1001 out. Under normal conditions, the spring 1003 pushes the central clamping block 1001 to protrude slightly outward, realizing the pre-limiting position when the crossarm 1 is equipped with the pole.

[0029] Reference Figures 1-6 As shown, one end of the moving block 1004 is provided with an arc-shaped extrusion part 1006, and a lifting block 1007 is symmetrically slidably installed in the clamp 3. One end of the lifting block 1007 is provided with a wedge-shaped part, which is adapted to the wedge-shaped drive block 1002. The other end of the lifting block 1007 is provided with an arc-shaped block 1008, which is used to extrude the arc-shaped extrusion part 1006.

[0030] During the clamping process, the pole squeezes the middle clamping block 1001 and retracts inward, driving the wedge-shaped drive block 1002 to move synchronously. Through the wedge-shaped slope, the lifting blocks 1007 on both sides are driven to move, so that the arc-shaped blocks 1008 on both sides of the lifting block 1007 squeeze the arc-shaped squeezing part 1006 of the moving block 1004, thereby pushing the side clamping blocks 1005 on both sides to push outward synchronously. Finally, the middle clamping block 1001 and the side clamping blocks 1005 on both sides together form an upper, middle and lower three-point adaptive clamping structure, which automatically adapts to the outer diameter tolerance of the pole and eliminates the clamping gap.

[0031] Therefore, the present invention adopts a lightweight crossarm structure with dual-circuit tension bar. The crossarm 1 has a hollow cavity 8 in the middle section to reduce weight. Trapezoidal compressive reinforcing ribs 9 are arranged vertically through the cavity. The bottom of the ribs is integrally fixed with the thickened layer 5 of the lower wall, which is specifically designed to resist the buckling failure of the lower wall caused by horizontal tension. A segmented differentiated reinforcement logic is adopted: the high stress areas at the root and end retain the arc-shaped tensile reinforcing ribs 6, while the tensile ribs are removed and the cavity is opened in the low stress area of ​​the middle section, so as to achieve a gradient matching design of "strengthening the strong stress area and reducing the weight of the weak stress area".

[0032] By hollowing out the middle section 8, eliminating the redundant arc-shaped tensile reinforcement 6 in the middle section, and reducing the amount of plying in the low-stress area, the ineffective material is removed to the maximum extent while retaining the core load-bearing reinforcement structure; compared with traditional angle steel crossarms, the weight is reduced by more than 60%, and compared with ordinary uniform cross-section composite crossarms, the weight is reduced by 25% to 35%, which effectively reduces the vertical load of the tower and the wind vibration load of the line, and improves the overall wind resistance and stability of the line.

[0033] The clamp 3 has a built-in spring 1003 pre-tightened wedge-shaped linkage adaptive clamping assembly 10. In the initial assembly state, the spring 1003 pushes the central clamping block 1001 out of the inner circle of the clamp 3 to achieve pre-positioning of the pole in high-altitude operation. During the locking and clamping process of the bolt 4, the pole body squeezes the central clamping block 1001 inward and pushes it outward through the linkage of the wedge structure, thereby forming a three-point three-dimensional adaptive clamping, which automatically compensates for the roundness error of the pole and the installation gap, and greatly improves the vibration resistance, anti-slip and anti-loosening performance under tension conditions.

[0034] A manufacturing process for a dual-circuit tension rod lightweight crossarm, applicable to the aforementioned dual-circuit tension rod lightweight crossarm structure, includes the following steps: S1: Tooling assembly and raw material pretreatment; the root, middle and end sections of the split core mold are connected and assembled, the overall contour is calibrated, the eccentric gradient section design is matched, the impregnated glass fiber yarn and epoxy resin system are configured in different areas, the two types of substrates, high compressive circumferential glass fiber and high tensile axial glass fiber are distinguished, the resin content is controlled at 28% to 32%, and the interlayer bonding strength and outdoor weather resistance are guaranteed. S2: Winding molding; using a wet continuous winding process, relying on a special variable cross-section core mold to form the overall matrix and built-in reinforcing structure in one go: first, a thickened layer 5 is formed by winding multiple layers of circumferential glass fiber, which is then cured to form a trapezoidal compressive reinforcing rib 9; then the side wall is formed, and the upper and lower corner areas of the side wall are thickened to form transition ribs, and the middle section is reduced in layup to achieve a hollow structure in accordance with the mold outline; finally, the top structure is formed in segments with differentiated molding, and axial glass fiber is wound in the arc groove area of ​​the core mold at the root and end to form an upwardly convex arc tensile reinforcing rib 6, and no tensile ribs are laid in the grooveless area of ​​the middle section; S3: Overall curing and shaping; local reinforcement is carried out for high stress areas. High-density closed-cell anti-compression foam core is injected only into the hollow cavity 8 of the clamping section to improve local anti-compression performance. The middle section of the crossbeam 1 is kept completely hollow to reduce weight. The molded component is first pre-cured at room temperature for 2 hours to complete the initial shaping, and then sent to the drying room at 60-70℃ for constant temperature curing for 4 hours to eliminate the internal stress of the component. After curing, the segmented core mold is disassembled. S4: Finishing and corrosion protection; cut and flatten both ends of the crossarm 1, process the assembly bevel of the clamp 3, spray the entire crossarm 1 with weather-resistant insulating topcoat, and complete the anti-corrosion, insulation and weather-resistant treatment to obtain the finished component.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A lightweight crossarm structure for a double-circuit tension rod, comprising a crossarm (1) and insulators (2), wherein the insulators (2) are symmetrically mounted on the surface of the crossarm (1), and six insulators (2) are arranged to form a double circuit, characterized in that: The crossarm (1) is adapted to the working condition of tension rod top support conductor. It adopts a cross-section with thicker bottom and thinner top eccentric gradient wall thickness. A thickened layer (5) is set at the bottom of the crossarm (1) to improve the compressive strength. The crossarm (1) is set with reinforcing ribs and hollow weight reduction areas based on the stress zone differentiation. The crossarm (1) has an integrally formed arc-shaped tensile reinforcing rib (6) in the high stress main stress area. The crossarm (1) has a hollow cavity (8) in the low stress area for weight reduction. A trapezoidal compressive reinforcing rib (9) is arranged in the hollow cavity (8).

2. The lightweight crossarm structure with dual-loop tension bar according to claim 1, characterized in that: The arc-shaped tensile reinforcing rib (6) is an upwardly convex arc-shaped strip structure. The arc-shaped tensile reinforcing rib (6) is segmented and is only set in the clamping section and end support section of the crossbeam (1). The arc-shaped tensile reinforcing rib (6) is removed in the middle section of the crossbeam (1) and a hollow cavity (8) is opened.

3. The lightweight crossarm structure with dual-loop tension rod according to claim 2, characterized in that: The bottom edge of the trapezoidal compressive reinforcing rib (9) is integrally fixed with the inner wall of the thick lower wall of the crossarm (1), and the vertical edge extends upward toward the hollow cavity (8) area and penetrates the hollow cavity (8) to resist the continuous compressive stress on the lower wall generated by the horizontal tension of the upper support conductor and prevent the lower wall of the crossarm (1) from buckling and deforming.

4. The lightweight crossarm structure with dual-loop tension bar according to claim 3, characterized in that: A clamp (3) is installed at the root of the crossarm (1), and a root reinforcing rib (7) is provided between the root of the crossarm (1) and the clamp (3).

5. A lightweight crossarm structure with dual-loop tension rod according to claim 4, characterized in that: The crossarm (1) is divided into a root clamping section, a middle weight reduction section, and an end support platform section along the axial direction. The hollow cavity (8) of the root clamping section is reduced in size, while retaining the arc-shaped tensile reinforcing rib (6), and is coordinated with the root reinforcing rib (7) to adapt to the compressive stress and composite bending moment of the clamp (3). The hollow cavity (8) is filled with a high-density closed-cell pressure-resistant core. The arc-shaped tensile reinforcing rib (6) is removed in the middle weight reduction section, and a hollow cavity (8) is opened. The arc-shaped tensile reinforcing rib (6) is restored in the end support platform section, and the upper and lower walls are locally thickened to adapt to the concentrated upward pulling force of the insulator (2).

6. The lightweight crossarm structure with dual-loop tension bar according to claim 5, characterized in that: The crossarm (1) is made by continuous wet winding of fibers in one piece. The trapezoidal compressive reinforcing rib (9) and the arc-shaped tensile reinforcing rib (6) are wound and solidified with the crossarm (1) in one step without secondary bonding or welding. The crossarm (1) adopts a zoned differentiated fiber layup design. The trapezoidal compressive reinforcing rib (9) and the thickened layer (5) are laid with circumferential glass fiber in a high proportion to improve the compressive buckling performance. The arc-shaped tensile reinforcing rib (6) is laid with axial glass fiber in a high proportion to improve the tensile bearing capacity. The fiber layup in the hollow cavity area of ​​the middle section is reduced to match the lightweight design requirements.

7. A lightweight crossarm structure with dual-loop tension rod according to claim 6, characterized in that: The two clamps (3) are fastened together by bolts (4). The clamps (3) are also provided with an adaptive clamping assembly (10). The adaptive clamping assembly (10) includes a central clamping block (1001) and a lateral clamping block (1005). The central clamping block (1001) is movably disposed on the side wall of the clamp (3). A wedge-shaped drive block (1002) is fixedly installed at one end of the central clamping block (1001). A moving block (1004) is also symmetrically slidably installed in the clamps (3). The lateral clamping block (1005) is fixedly installed at one end of the moving block (1004).

8. A lightweight crossarm structure with dual-loop tension rod according to claim 7, characterized in that: One end of the wedge-shaped drive block (1002) is fixedly installed with a spring (1003), and the other end of the spring (1003) is fixedly connected to the inner wall of the clamp (3) to push the middle clamp block (1001) out.

9. A lightweight crossarm structure with dual-loop tension rod according to claim 8, characterized in that: One end of the moving block (1004) is provided with an arc-shaped extrusion part (1006), and a lifting block (1007) is symmetrically slidably installed in the clamp (3). One end of the lifting block (1007) is provided with a wedge-shaped part, which is adapted to the wedge-shaped drive block (1002). The other end of the lifting block (1007) is provided with an arc-shaped block (1008) for extruding the arc-shaped extrusion part (1006).

10. A manufacturing process for a dual-loop tension rod lightweight crossarm, applicable to the dual-loop tension rod lightweight crossarm structure described in claim 9, characterized in that, Includes the following steps: S1: Tooling assembly and raw material pretreatment; the root, middle and end sections of the split core mold are connected and assembled, the overall contour is calibrated, the eccentric gradient section design is matched, the impregnated glass fiber yarn and epoxy resin system are configured in different areas, the two types of substrates, high compressive circumferential glass fiber and high tensile axial glass fiber are distinguished, the resin content is controlled at 28% to 32%, and the interlayer bonding strength and outdoor weather resistance are guaranteed. S2: Winding molding; Wet continuous winding process is adopted, relying on a special variable cross-section core mold to form the overall matrix and built-in reinforcing structure in one step: First, a thickened layer (5) is formed by winding multiple layers of circumferential glass fiber, and then a trapezoidal compressive reinforcing rib (9) is formed by curing. Then, the side wall is formed, and the upper and lower corner areas of the side wall are thickened to form transition ribs. The middle section is reduced in the layup to match the mold outline to achieve a hollow structure. Finally, the top structure is formed in segments with differentiated molding. Axial glass fiber is wound in the arc groove area of ​​the core mold at the root and end to form an upward arc tensile reinforcing rib (6). Tensile ribs are not laid in the grooveless area of ​​the middle section. S3: Overall curing and shaping; local reinforcement is carried out for high stress areas. High-density closed-cell anti-compression foam core is injected only into the hollow cavity (8) of the clamping section to improve local anti-compression performance. The middle section of the crossbeam (1) is kept completely hollow to reduce weight. The molded component is first pre-cured at room temperature for 2 hours to complete the initial shaping, and then sent to the drying room at 60-70℃ for constant temperature curing for 4 hours to eliminate the internal stress of the component. After curing, the segmented core mold is disassembled. S4: Fine machining and corrosion protection; cut and flatten both ends of the crossarm (1), process the clamp (3) assembly bevel, spray the entire crossarm (1) with weather-resistant insulating topcoat, complete the corrosion protection, insulation and weather resistance treatment, and obtain the finished component.

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