An on-line cable conductor stranding device
The online-formed cable conductor stranding device utilizes a cured coating to lock and shape the conductor, solving the problem of loose stranding and springback. This achieves high-efficiency production and improved product reliability, and is suitable for high-voltage cables and automotive cables.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- WUHU RUINAN IND EQUIP CO LTD
- Filing Date
- 2026-05-28
- Publication Date
- 2026-07-14
Smart Images
Figure CN122393078A_ABST
Abstract
Description
Technical Field
[0001] This invention mainly relates to the field of wire and cable manufacturing equipment technology, specifically to a cable conductor stranding device that can be shaped online. Background Technology
[0002] A cable stranding device is a specialized mechanical device used to strand multiple single-strand conductors according to a specific pitch and direction to form a complete conductor. It is widely used in power cables (especially medium and high voltage cross-linked polyethylene insulated cables), automotive cables, electronic cables, and other fields to improve the mechanical strength, electrical performance, and reliability of subsequent processing of the conductor.
[0003] In the field of power cable manufacturing, the stranding quality of the conductors directly affects the performance of the final product. Currently, the working process of the stranding device is mainly divided into three stages: unwinding, stranding, and take-up. Multiple single wires are drawn from the unwinding reel, arranged in an orderly manner by the wire separator, and then enter the stranding area. The single wires are stranded in a spiral manner by the rotation of the winch or coiler.
[0004] However, the inherent elastic memory effect of copper / aluminum conductors causes the internal stress generated during stranding to gradually release after forming, resulting in a loose and springy stranded structure. This manifests as pitch elongation and uneven expansion of the conductor's outer diameter. When this unstable conductor enters the critical subsequent cross-linked polyethylene (XLPE) insulation extrusion process, it easily leads to insulation layer eccentricity and uneven thickness, causing localized electric field concentration and increased partial discharge in the cable, severely damaging its long-term service life and reliability. This is a critical technological challenge that urgently needs to be addressed in the manufacturing of medium and high voltage power cables.
[0005] Meanwhile, in the automotive cable manufacturing industry, stranded cables also face structural loosening problems caused by conductor springback and high-frequency vibrations and wide temperature range changes (-40℃ to 120℃) during vehicle operation. Traditionally, automotive cables are often locally fixed using methods such as heat shrink tubing or tape binding, but these methods have low production efficiency, poor consistency, and add extra weight and volume.
[0006] In summary, whether it is power cables that require extremely high electrical reliability or automotive cables that have stringent requirements for space, weight and environmental durability, existing technologies lack an integrated solution that can prevent stranded conductors from springing back and loosening online, efficiently, and structurally. Summary of the Invention
[0007] 1. The technical problem that the invention aims to solve: The present invention provides an online-formable cable conductor stranding device to solve the technical problems existing in the background art.
[0008] 2. Technical Solution: To achieve the above objectives, the technical solution provided by the present invention is: an online-formable cable conductor stranding device, comprising... The control box integrates a PLC control system and multiple independent servo drive units, and each drive unit has a torque sensor at its output. The workbench is made of concave groove aluminum alloy platform with an anti-static coating on the surface. The concave groove aluminum alloy platform can hold the conductor to be stranded and the conductor after stranding and shaping. The slide rail base, located on the side of the control box, adopts a high-precision linear guide rail structure and is equipped with a grating ruler positioning system to achieve high positioning accuracy. An adjustable fixing mechanism is matched and connected to the slide rail seat to quickly fix the conductor end, which facilitates subsequent stranding operations; A ring-shaped spraying mechanism, matched and connected to the slide rail seat, is equipped with an atomizing nozzle for spraying curing liquid onto stranded conductors; This application addresses the technological challenge of loosening of power cable conductors due to internal stress rebound after stranding. Traditional methods using heat-shrink tubing for locking significantly increase the overall cable weight and space requirements. Therefore, a ring-shaped spraying mechanism is installed on the outside. During operation, one end of the conductor to be stranded is clamped at the drive unit on the worktable, and the other end is clamped at the adjustable fixing mechanism. Then, an independent drive unit in the control box rotates the conductor to complete the stranding action. After stranding, the ring-shaped spraying mechanism moves along the conductor, spraying a curing coating onto the outer layer of the stranded conductor. After the curing coating cools, the conductor can be removed. Then, the operator opens the positioning mechanisms at both ends to complete the entire operation. This device, by spraying a curing coating onto the outside of the stranded conductor, provides a locking and shaping effect after a preset time. In subsequent applications, the curing coating provides a certain degree of protection and effectively prevents the stranded structure from springing back and loosening.
[0009] Furthermore, the top of the slide rail seat has two concave grooves, and a first rotating screw and a second rotating screw are respectively provided in the concave grooves. One end of the first rotating screw and the second rotating screw are connected to the drive unit. The first rotating screw is matched and connected to the adjustable fixing mechanism, and the second rotating screw is matched and connected to the annular spraying mechanism.
[0010] Furthermore, the adjustable fixing mechanism includes a movable box, a sliding block connected to the rear end of the movable box, a matching connection of the first rotating lead screw to the bottom of the sliding block, an L-shaped sliding rail connected to the side of the movable box, two convex sliding positioning plates matched and connected on the L-shaped sliding rail, and a fixing device detachably connected to the outside of the convex sliding positioning plates.
[0011] Furthermore, two telescopic cylinders are symmetrically arranged inside the movable box. The output end of the telescopic cylinder passes through the movable box and is connected to the convex sliding positioning plate. A spring is provided on the inner side of the telescopic cylinder, and the outer end of the spring is connected to the convex sliding positioning plate.
[0012] Furthermore, the end of the drive unit is connected to the fixing device, and the end of the fixing device has a fixing notch, with a locking screw provided inside the fixing notch.
[0013] Furthermore, the annular spraying mechanism includes a concave sliding table, which is connected to a second rotating lead screw; the concave sliding table has a detachable, symmetrically arranged C-shaped spraying component on one side facing the worktable, and a high-pressure spraying water tank is connected to the other side. The top of the high-pressure spraying water tank is connected to a C-shaped spraying component via a water supply hose. Multiple nozzles are arranged in a ring array on the inner circumference of the C-shaped spraying component. An opening structure is provided on the outer side of the C-shaped spraying component.
[0014] Furthermore, the C-shaped spray coating part is symmetrically provided with C-shaped drying parts on both sides, and curing lamp beads are arranged in a ring on the inner side of the C-shaped drying parts.
[0015] Furthermore, the concave sliding table has connection holes at the four corners of one side of the worktable. The connection holes are connected to the protective cover by screws. The bottom of the protective cover is connected to the paint mist recovery device through an exhaust pipe. The bottom of the paint mist recovery device is slidably connected to the first track, which is located at the support leg of the worktable.
[0016] Furthermore, the rear end of the high-pressure spray water tank is connected to a rotating motor, and the output shaft of the rotating motor is connected to a first magnetic block; The inner wall of the high-pressure spray water tank is provided with a second magnetic block, and the rear end of the second magnetic block is fixedly connected to a stirring rod.
[0017] Furthermore, the curing liquid contained in the high-pressure spray tank is a polyurethane composite coating solution, which includes 50%-60% polyurethane resin matrix, 3%-5% adhesion promoter, 5-8% nano-reinforcing filler, 10%-15% flame retardant, and 1-2% anti-aging agent.
[0018] 3. Beneficial effects: Compared with the prior art, the technical solution provided by this invention has the following advantages: This invention is rationally designed, using a ring-shaped spraying mechanism and a cured coating to replace the traditional heat shrink tubing, effectively preventing the stranded conductor from springing back and loosening, while reducing the final cable weight and space occupation, and improving product reliability.
[0019] The automated design, combined with an adjustable fixing mechanism and paint mist recovery device, significantly improves production efficiency, reduces manual intervention, and enables environmentally friendly operations, making it suitable for mass production of high-strength automotive cable harnesses.
[0020] It should be noted that the structures not described in this invention are not related to the design points and improvement directions of this invention, and are the same as or can be implemented using existing technologies, so they will not be elaborated here. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 For the present invention Figure 1 Enlarged schematic diagram of the structure at point A; Figure 3 This is a schematic diagram of the other side of the structure of the present invention; Figure 4 This is a schematic diagram of the adjustable fixing mechanism of the present invention; Figure 5 This is a schematic diagram of the annular spraying mechanism of the present invention; Figure 6 This is a schematic diagram of the structure of the stirring rod in this invention; Figure 7 This is a schematic diagram of the bottom structure of the workbench of the present invention.
[0022] Figure label: 1. Control box; 2. Drive unit; 3. Worktable; 4. Slide rail seat; 41. Concave slide groove; 42. First rotating lead screw; 43. Second rotating lead screw; 5. Adjustable fixing mechanism; 51. Moving box; 511. Telescopic cylinder; 512. Spring; 52. Sliding block; 53. L-shaped sliding track; 54. Convex sliding positioning plate; 55. Fixing device; 56. Fixing notch; 57. Locking screw; 6. Circular spraying mechanism; 61. Concave sliding table; 611. Connecting hole; 612. Protective cover; 613. Exhaust pipe; 614. Paint mist recovery device; 615. First track; 62. C-shaped spraying part; 63. High-pressure spraying water tank; 631. Rotating motor; 632. First magnetic block; 633. Second magnetic block; 634. Stirring rod; 64. Spray head; 65. C-shaped drying part; 66. Curing lamp bead. Detailed Implementation
[0023] To facilitate understanding of the present invention, a more complete description of the invention will be given below with reference to the accompanying drawings, which illustrate several embodiments of the invention. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the invention will be more thorough and complete.
[0024] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "page," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this 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 this invention.
[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.
[0026] In this invention, unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," "fixed," "provided with," and "located in" 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 connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0027] It should be noted that structures not described in this invention do not involve the design points and improvement directions of this invention, and can all be achieved using existing technologies known to those skilled in the art.
[0028] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.
[0029] See attached document Figure 1-7 A cable conductor stranding device capable of online shaping, comprising: The control box 1 integrates a PLC control system and multiple independent servo drive units 2, and each drive unit 2 is equipped with a torque sensor at its output end. Workbench 3 is a concave groove aluminum alloy platform with an anti-static coating on the surface. The concave groove aluminum alloy platform can hold the conductor to be stranded and the conductor after stranding and shaping. The slide rail 4 is located on the side of the control box 1. It adopts a high-precision linear guide rail structure and is equipped with a grating ruler positioning system to achieve high positioning accuracy. The adjustable fixing mechanism 5 is matched and connected to the slide rail seat 4 to quickly fix the conductor end, which facilitates subsequent stranding operations; The annular spraying mechanism 6 is matched and connected to the slide rail seat 4, and is equipped with an atomizing nozzle 64 for spraying curing liquid onto the stranded conductor. In this embodiment, this application addresses the technological challenge of loosening of the conductor structure due to internal stress rebound after stranding in power cables. Traditional methods of using heat shrink tubing for locking significantly increase the overall weight and space occupied by the cable. Therefore, an annular spraying mechanism 6 is installed on the outside. During operation, one end of the conductor to be stranded on the workbench 3 is clamped at the drive unit 2, and the other end is clamped at the adjustable fixing mechanism 5. Subsequently, the independent drive unit 2 in the control box 1 drives the conductor to rotate and complete the stranding action. After stranding, the annular spraying mechanism 6 moves along the conductor and sprays a curing coating on the outer layer of the stranded conductor. After the curing coating cools, the shaped conductor can be removed. Then, the operator opens the positioning mechanisms at both ends to complete the entire operation. This device sprays a curing coating on the outside of the stranded conductor. After a preset time, the curing coating will lock and shape the conductor. In subsequent applications, the curing coating can provide a certain degree of protection and effectively prevent the stranded structure from rebounding and loosening.
[0030] Please refer to this carefully. Figure 1 and 2 The slide rail seat 4 has two concave grooves 41 on its top. A first rotating lead screw 42 and a second rotating lead screw 43 are respectively provided in the concave grooves 41. One end of the first rotating lead screw 42 and the second rotating lead screw 43 are connected to the drive unit 2. The first rotating lead screw 42 is matched and connected to the adjustable fixing mechanism 5. The second rotating lead screw 43 is matched and connected to the annular spraying mechanism 6. In this embodiment, the control box 1 is provided with two drive units 2, which are respectively connected to the first rotating lead screw 42 and the second rotating lead screw 43 and are independently controlled, thereby driving the adjustable fixing mechanism 5 and the annular spraying mechanism 6 to move in the concave grooves 41.
[0031] Please refer to this carefully. Figure 4 The adjustable fixing mechanism 5 includes a movable box 51, a sliding block 52 connected to the rear end of the movable box 51, a first rotating screw 42 matched and connected to the bottom of the sliding block 52, an L-shaped sliding rail 53 connected to the side of the movable box 51, two convex sliding positioning plates 54 matched and connected to the L-shaped sliding rail 53, and a fixing device 55 detachably connected to the outside of the convex sliding positioning plates 54. In this embodiment, the movable adjustable fixing mechanism 5 is used to perform stranding operations on cable conductors of different lengths. The movable box 51 and the L-shaped sliding rail 53 can be moved to any position of the slide rail seat 4 under the action of the first rotating screw 42, and then the conductor end can be clamped and fixed by the fixing device 55.
[0032] Please refer to this carefully. Figure 4 Two telescopic cylinders 511 are symmetrically arranged inside the movable box 51. The output end of the telescopic cylinder 511 passes through the movable box 51 and is connected to the convex sliding positioning plate 54. A spring 512 is provided on the inner side of the telescopic cylinder 511. The outer end of the spring 512 is connected to the convex sliding positioning plate 54. In this embodiment, before the fixing device 55 fixes the conductor end, the telescopic cylinder 511 drives the convex sliding positioning plate 54 to retract so that the conductor can be installed. After the fixing is completed, the telescopic cylinder 511 resets and stops working, and the spring 512 pushes the convex sliding positioning plate 54 to slide outward so that the conductor remains in a straight state. During the stranding process, when the conductor length changes slightly during stranding, the elastic tension of the spring 512 automatically adjusts the position of the convex sliding positioning plate 54 to ensure the uniformity of the stranding.
[0033] Please refer to this carefully. Figure 3 and 4 The drive unit 2 is connected to the fixing device 55 at one end. The fixing device 55 has a fixing notch 56 at one end. A locking screw 57 is provided inside the fixing notch 56. In this embodiment, when the operator needs to fix the conductor, he / she unscrews the locking screw 57 and puts the end of the conductor into the fixing notch 56. Then he / she tightens the locking screw 57 to fix the conductor and then the subsequent stranding operation can be carried out.
[0034] Please refer to this carefully. Figure 6 The annular spraying mechanism 6 includes a concave sliding table 61, which is connected to the second rotating lead screw 43. The concave sliding table 61 is provided with a detachable symmetrically arranged C-shaped spraying component 62 on one side facing the worktable 3, and the other side is connected to a high-pressure spraying water tank 63. The top of the high-pressure spraying water tank 63 is connected to the C-shaped spraying component 62 via a water supply hose. Multiple nozzles 64 are arranged in a ring array on the inner circumference of the C-shaped spraying component 62. The outer side of the C-shaped spraying component 62 has an opening structure. In this embodiment, the opening on the outer side of the C-shaped spraying component 62 facilitates the operator to insert the conductor. After the conductor is twisted, the second rotating screw 43 drives the concave sliding table 61 to move along the conductor. During the movement, the nozzles 64 simultaneously perform ring spraying operations. After the spraying is completed, the outer coating is cured after a period of time. This not only prevents the twisted conductor from spreading out, but also provides a certain degree of protection.
[0035] Please refer to this carefully. Figure 5The C-shaped spray coating part 62 is symmetrically provided with C-shaped drying parts 65 on both sides. Curing lamp beads 66 are arranged in a ring on the inner side of the C-shaped drying part 65. In this embodiment, the outer opening of the C-shaped spray coating part 62 makes it easy for the operator to put the conductor in. After the C-shaped spray coating part 62 is sprayed, the second rotating screw 43 drives the concave sliding table 61 to move along the conductor, and the C-shaped drying part 65 accelerates the curing process of the conductor.
[0036] Please refer to this carefully. Figure 5 and Figure 7 The concave sliding table 61 has connection holes 611 at the four corners of one side of the workbench 3. The connection holes 611 are connected to the protective cover 612 by screws. The bottom of the protective cover 612 is connected to the paint mist recovery device 614 through the exhaust pipe 613. The bottom of the paint mist recovery device 614 is slidably connected to the first track 615. The first track 615 is located at the support leg of the workbench 3. In this embodiment, in order to prevent paint mist from leaking out of the C-shaped spraying part 62 during operation, the protective cover 612 and the paint mist recovery device 614 are set. The paint mist recovery device 614 is similar to a vacuum cleaner, which uses a labyrinth filter paper / lime powder to absorb the unattached spray. The existing technology is used and will not be described in detail here. When the protective cover 612 moves, it will drive the paint mist recovery device 614 at the bottom to slide along with it.
[0037] Please refer to this carefully. Figure 6 The rear end of the high-pressure spray water tank 63 is connected to a rotating motor 631, and the output shaft of the rotating motor 631 is connected to a first magnetic block 632. The inner wall of the high-pressure spraying water tank 63 is provided with a second magnetic block 633. The rear end of the second magnetic block 633 is fixedly connected to a stirring rod 634. In this embodiment, the rotating motor 631 drives the first magnetic block 632 to rotate. Through the magnetic coupling between the first magnetic block 632 and the second magnetic block 633, the stirring rod 634 is driven to continuously stir the solidified liquid in the water tank to ensure the uniformity and stability of the solution.
[0038] The high-pressure spray tank 63 contains a curing liquid that is a polyurethane composite coating solution. This polyurethane composite coating solution comprises 50%-60% polyurethane resin matrix, 3%-5% adhesion promoter, 5-8% nano-reinforcing filler, 10%-15% flame retardant, and 1-2% anti-aging agent. In this embodiment, a curing solution with a polyurethane resin matrix as the main component is used. The adhesion promoter can be a silane coupling agent or an epoxy group modifier to enhance the bonding force with the metal strand. The nano-reinforcing filler can be nano-silica or carbon nanotubes to improve mechanical strength and shear resistance. The flame retardant is a halogen-free flame retardant such as aluminum hydroxide + phosphorus-based flame retardant, meeting cable industry standards. The anti-aging agent is the UV absorber Tinuvin 328 + the antioxidant Irganox. 1010 improves the curing effect and reduces the curing time. Other solvents can be added as needed. Other solvents can be a 7:3 mixture of acetone and butanone to balance the evaporation rate and environmental friendliness, as well as fumed silica TS-720 to prevent spraying sagging. It should be noted that the main function of the curing coating provided in this embodiment is to cure the stranded wire. Other conventional curing coating technologies can also be used, which will not be elaborated here.
[0039] The above-described embodiments are merely illustrative of certain implementations of the present invention, and are described in a relatively specific and detailed manner. However, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements are all within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.
Claims
1. A cable conductor stranding device capable of online shaping, characterized in that: include The control box (1) integrates a PLC control system and multiple independent servo drive units (2). The workbench (3) is made of concave groove aluminum alloy platform with an anti-static coating on the surface; The slide rail base (4) is located on the side of the control box (1) and adopts a high-precision linear guide structure; The adjustable fixing mechanism (5) is matched and connected to the slide rail seat (4) to quickly fix the conductor end, which facilitates subsequent stranding operations; The annular spraying mechanism (6) is matched and connected to the slide rail seat (4), and is equipped with an atomizing nozzle (64) for spraying curing liquid onto the stranded conductor.
2. The cable conductor stranding device capable of online shaping according to claim 1, characterized in that: The slide rail seat (4) has two concave slide grooves (41) on its top. The concave slide grooves (41) are respectively provided with a first rotating screw (42) and a second rotating screw (43). One end of the first rotating screw (42) and the second rotating screw (43) are connected to the drive unit (2). The first rotating screw (42) is matched and connected to the adjustable fixing mechanism (5). The second rotating screw (43) is matched and connected to the annular spraying mechanism (6).
3. The cable conductor stranding device capable of online shaping according to claim 2, characterized in that: The adjustable fixing mechanism (5) includes a movable box (51), a sliding block (52) connected to the rear end of the movable box (51), a first rotating screw (42) matched and connected to the bottom of the sliding block (52), an L-shaped sliding track (53) connected to the side of the movable box (51), two convex sliding positioning plates (54) matched and connected on the L-shaped sliding track (53), and a fixing device (55) detachably connected to the outside of the convex sliding positioning plate (54).
4. The cable conductor stranding device capable of online shaping according to claim 3, characterized in that: Two telescopic cylinders (511) are symmetrically arranged inside the movable box (51). The output end of the telescopic cylinder (511) passes through the movable box (51) and is connected to the convex sliding positioning plate (54). A spring (512) is provided on the inner side of the telescopic cylinder (511), and the outer end of the spring (512) is connected to the convex sliding positioning plate (54).
5. The cable conductor stranding device capable of online shaping according to claim 3, characterized in that: The drive unit (2) is connected to the fixing device (55) at one end. The fixing device (55) has a fixing notch (56) at one end, and a locking screw (57) is provided inside the fixing notch (56).
6. The cable conductor stranding device capable of online shaping according to claim 1, characterized in that: The annular spraying mechanism (6) includes a concave sliding table (61), which is connected to the second rotating screw (43) for transmission; the concave sliding table (61) has a detachable symmetrically arranged C-shaped spraying parts (62) on one side facing the worktable (3), and the other side is connected to a high-pressure spraying water tank (63). The top of the high-pressure spray tank (63) is connected to the C-shaped spraying component (62) via a water supply hose. Multiple nozzles (64) are arranged in a ring array on the inner circumference of the C-shaped spraying component (62). The outer side of the C-shaped spraying component (62) has an opening structure.
7. The cable conductor stranding device capable of online shaping according to claim 6, characterized in that: The C-shaped spray coating part (62) is symmetrically provided with C-shaped drying parts (65) on both sides, and curing lamp beads (66) are arranged in a ring on the inner side of the C-shaped drying part (65).
8. The cable conductor stranding device capable of online shaping according to claim 6, characterized in that: The concave sliding table (61) has connection holes (611) at the four corners of one side of the worktable (3). The connection holes (611) are connected to the protective cover (612) by screws. The bottom of the protective cover (612) is connected to the paint mist recovery device (614) through the exhaust pipe (613). The bottom of the paint mist recovery device (614) is slidably connected to the first track (615), which is located at the support leg of the worktable (3).
9. A cable conductor stranding device capable of online shaping according to claim 6, characterized in that: The high-pressure spray water tank (63) is connected to a rotating motor (631) at its rear end, and the output shaft of the rotating motor (631) is connected to a first magnetic block (632). The inner wall of the high-pressure spray water tank (63) is provided with a second magnetic block (633), and the rear end of the second magnetic block (633) is fixedly connected to a stirring rod (634).
10. A cable conductor stranding device capable of online shaping according to claim 6, characterized in that: The curing liquid contained in the high-pressure spray tank (63) is a polyurethane composite coating solution, which includes 50%-60% polyurethane resin matrix, 3%-5% adhesion promoter, 5-8% nano-reinforcing filler, 10%-15% flame retardant, and 1-2% anti-aging agent.