Flame retardant filled cord

Abstract

The utility model discloses a kind of flame-retardant filling ropes, including inner rope body, outer rope body, wherein, inner rope body is wound outer rope body outside, outer rope body is spiral, is wound in the outer surface of inner rope body, outer rope body section is Greek letter Ω shape, outer rope body adopts spiral structure, make filling rope show similar spring deformation behavior in longitudinal direction, both can realize substantial compression, also can bear tensile load, and after stress release, quickly restore original shape, show excellent resilience and flexibility. Compared with the structure of traditional filling rope, the above design significantly broadens its application range, especially suitable for cable occasions with high requirements for flexibility and anti-deformation ability.

Description

Technical Field

[0001] This utility model relates to the field of flame-retardant rope technology, and in particular to a flame-retardant filled rope. Background Technology

[0002] Flame-retardant filler ropes are key components in cable, optical fiber, and other cable products, primarily used to fill internal gaps and maintain structural stability. Their flame-retardant performance directly affects the safety and reliability of the cables. Existing manufacturing technologies are centered on the "flame retardant introduction method," forming two main routes: integral impregnation with flame-retardant liquid and blending with flame-retardant masterbatch. Auxiliary processes such as surface coating and composite structures have also emerged. The integral impregnation method is simple and low-cost, but the flame retardant is prone to leakage, resulting in poor durability and affecting flexibility. The blending with masterbatch method offers stable flame retardant bonding and good durability, but the process is complex and costly. Auxiliary processes such as surface coating and composite structures each have their advantages and disadvantages, but all have shortcomings. Existing technologies have significant limitations: the flame retardant leakage problem in the impregnation method remains unresolved; the efficiency of halogen-free flame retardants in the blending method is low; halogenated flame retardants are not environmentally friendly; and some technologies affect physical properties. Future development should focus on improving flame retardant dispersibility and durability, reducing blending costs, environmental friendliness, and technological integration to meet industry needs. Utility Model Content

[0003] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a flame-retardant filling rope, comprising an inner rope body and an outer rope body, wherein the outer rope body is wound around the outside of the inner rope body, the outer rope body is spiral in shape and is wound around the outer surface of the inner rope body, and the cross-section of the outer rope body is in the shape of the Greek letter Ω.

[0004] Furthermore, the inner rope body includes a protective layer and a rope core, wherein the protective layer is configured to wrap around the rope core.

[0005] Furthermore, the rope core includes an inner sheath, flame-retardant rope strands, and a central skeleton, wherein the central skeleton is located at the center of the rope core, several flame-retardant rope strands are located on the outside of the central skeleton, and the inner sheath wraps around several flame-retardant rope strands.

[0006] Furthermore, the protective layer includes an outer protective layer and thermally conductive rope strands, wherein several thermally conductive rope strands are disposed on the outside of the inner protective layer, and the outer protective layer wraps around several thermally conductive rope strands.

[0007] Furthermore, the protective layer also includes a flame retardant, which is placed between the outer and inner protective layers and fills the gaps between several thermally conductive strands.

[0008] The beneficial effects of this invention are as follows: The outer rope adopts a helical structure, which allows the filler rope to exhibit spring-like deformation behavior in the longitudinal direction. This enables it to achieve significant compression and withstand tensile loads, and it quickly returns to its original shape after stress release, demonstrating excellent resilience and flexibility. Compared with traditional filler rope structures, the above design significantly broadens its application range, especially suitable for cable applications requiring high flexibility and resistance to deformation. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of a flame-retardant filled rope.

[0010] Figure 2 This is a schematic diagram of the outer and inner rope structures.

[0011] Figure 3 This is a schematic diagram of the internal structure of the inner rope.

[0012] Figure 4 This is a schematic diagram of the cross-sectional structure of the outer rope.

[0013] The structure includes an inner rope body 100, a protective layer 110, an outer protective layer 111, a heat-conducting rope strand 112, a flame retardant 113, a rope core 120, an inner protective layer 121, a flame-retardant rope strand 122, a central skeleton 123, and an outer rope body 200. Detailed Implementation

[0014] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0015] Reference Figure 1 A flame-retardant filled rope includes an inner rope body 100 and an outer rope body 200, wherein the outer rope body 200 is arranged to wrap the inner rope body 100 and the outer rope body 200 is spiral in shape; the outer rope body 200 is made of one or more flame-retardant fiber bundles, such as flame-retardant PP or flame-retardant PET materials.

[0016] Reference Figure 1 , Figure 2 and Figure 4 The outer rope 200 has a specially designed irregular cross-section, resembling the Greek letter "Ω". This structure is hollow internally, with an opening at the bottom and a continuous, smooth arc at its highest point extending to both sides. When subjected to external radial compression, this "Ω"-shaped structure effectively transmits the force downwards along the arc, ultimately distributing it to the two supporting feet at the bottom, thus significantly improving the overall load-bearing capacity. This mechanical design not only enhances the structure's stability but also effectively prevents localized deformation or surface cracking of the filler rope under external forces.

[0017] Furthermore, the outer rope 200 is spirally wound around the inner rope 100, forming a continuous and uniform covering structure. This spiral structure causes the filler rope to exhibit spring-like deformation behavior in the longitudinal direction, enabling it to withstand significant compression and tensile loads, and quickly return to its original shape after stress release, demonstrating excellent resilience and flexibility. Compared to traditional filler rope structures, this design significantly broadens its application range, especially suitable for cable applications requiring high flexibility and resistance to deformation.

[0018] During actual installation, when radial pressure is applied to the outer rope of the cable sheath, the spiral structure can adapt and deform, fully filling the internal gaps of the cable to achieve a higher degree of fullness and eliminate dead angles, while maintaining the integrity of the overall structure. Its hollow design not only reduces weight per unit length and saves material costs, but also creates a miniature air channel. This channel promotes a small amount of internal airflow during cable operation, aiding in heat dissipation and thus improving the cable's heat dissipation performance.

[0019] The entire outer rope body 200 is made of flame-retardant material, inheriting the inherent flame-retardant properties of the material, making it suitable for applications with high fire protection requirements. Its hollow structure also improves thermal insulation performance to a certain extent, further enhancing the cable's safety and durability.

[0020] Reference Figure 2 , Figure 3 The inner rope body 100 includes a protective layer 110 and a rope core 120. The protective layer 110 is provided to wrap the rope core 120. The protective layer 110 includes an outer protective layer 111, thermally conductive rope strands 112, and flame retardant 113. The rope core 120 includes an inner protective layer 121, flame-retardant rope strands 122, and a central skeleton 123.

[0021] Reference Figure 3 In the entire inner rope body 100, the center is the central skeleton 123, which serves as the core of structural support, enhances the overall tensile and compressive strength of the cable, prevents the cable core from deforming when bent or under stress, and maintains structural stability. It can be made of high-strength polypropylene, nylon, aramid fiber bundles, or metal / non-metal composite materials, such as FRP fiber reinforced plastic materials, taking into account both strength and flexibility.

[0022] Reference Figure 3 Several flame-retardant rope strands 122 wrap around the central skeleton 123. The main function of the flame-retardant rope strands 122 is to fill the gaps in the cable by their volume, keep the cable core round, and prevent the core from shifting. At the same time, they have excellent flame-retardant and high-temperature resistance properties, delay the spread of flames, and improve the overall fire resistance level. Polypropylene PP can be used as the matrix, with the addition of halogen-free flame retardants such as phosphorus and nitrogen system and magnesium hydroxide, and high-temperature resistant fibers such as aramid fiber and glass fiber for reinforcement.

[0023] Reference Figure 3The inner sheath 121 wraps around the entire flame-retardant rope strand 122 and the central skeleton 123, making them a whole, that is, forming the rope core 120. The inner sheath 121 plays the roles of insulation protection, structural stability, preventing moisture intrusion and assisting in flame retardancy. It can be made of halogen-free low-smoke flame-retardant polyolefin, thermoplastic ceramicized halogen-free low-smoke flame-retardant polyolefin, such as TWD material, nylon sheath material, etc., and has good flame retardancy, insulation and flexibility.

[0024] Reference Figure 3 Several thermally conductive strands 112 are tightly wrapped around the outer side of the inner sheath 121 to conduct heat, avoid local overheating, and improve overall thermal stability; at the same time, they assist in heat dissipation and enhance the operating safety of the cable in high-temperature environments. They are made of synthetic fibers with good thermal conductivity, such as modified polyester and aramid, or inorganic fibers, such as glass fiber, and thermally conductive fillers, such as alumina and boron nitride.

[0025] Reference Figure 3 The outer sheath 111 wraps several thermally conductive rope strands 112, located on the outermost layer. It mainly undertakes functions such as mechanical protection, waterproofing and moisture-proofing, chemical corrosion prevention, and flame retardancy and fireproofing. It is the first barrier for the cable to resist external environment and flame attack. It can be made of ceramicized silicone rubber, low smoke halogen-free flame-retardant polyolefin, weather-resistant high flame-retardant polyolefin and other materials. These materials can be ceramicized at high temperature to form a hard protective layer, which effectively isolates flame and high temperature.

[0026] Reference Figure 3 Flame retardant 113 is filled between the outer protective layer 111 and the inner protective layer 121. Through mechanisms such as heat absorption and cooling, release of inert gas to dilute oxygen, and formation of carbonized layer to isolate flame, it inhibits the combustion chain reaction and achieves flame retardant and smoke suppression effects.

[0027] By superimposing multiple structures, the "air passage" inside the cable that might otherwise be used by flames can be transformed into a "firewall." Under normal circumstances, it is just a lightweight filler rope, but once exposed to fire, it quickly carbonizes to form a continuous heat-insulating skeleton. This not only blocks oxygen and inhibits the longitudinal spread of flames, but also reduces the external high temperature of 800 ℃ to below 200 ℃, giving the insulation layer a safety window of more than 30 minutes. At the same time, the halogen-free formula significantly reduces smoke and toxicity, and the cable core remains round and does not collapse after combustion, preventing short circuits and secondary arcs. It passively achieves a four-in-one protection of "fire suppression, heat insulation, smoke suppression, and structural protection," upgrading the entire cable from a "combustible material" to a "flame-retardant material."

Claims

1. A flame-retardant filled rope, characterized in that, Includes an inner rope (100) and an outer rope (200), wherein, The inner rope (100) is wrapped around the outer rope (200). The outer rope (200) is spiral-shaped and wrapped around the outer surface of the inner rope (100). The cross-section of the outer rope (200) is shaped like the Greek letter Ω.

2. The flame-retardant filler rope according to claim 1, characterized in that, The inner rope body (100) includes a protective layer (110) and a rope core (120), wherein, The protective layer (110) is set to wrap the rope core (120).

3. The flame-retardant filler rope according to claim 2, characterized in that, The rope core (120) includes an inner sheath (121), flame-retardant rope strands (122), and a central skeleton (123), wherein, The central frame (123) is set at the center of the rope core (120). Several flame-retardant rope strands (122) are arranged on the outside of the central frame (123). The inner protective layer (121) is wrapped with several flame-retardant rope strands (122).

4. The flame-retardant filler rope according to claim 3, characterized in that, The protective layer (110) includes an outer protective layer (111) and thermally conductive strands (112), wherein, Several thermally conductive strands (112) are arranged on the outside of the inner protective layer (121). The outer protective layer (111) is wrapped with several thermally conductive rope strands (112).

5. The flame-retardant filler rope according to claim 4, characterized in that, The protective layer (110) also includes a flame retardant (113). Flame retardant (113) is placed between the outer protective layer (111) and the inner protective layer (121) to fill the gap between several thermally conductive rope strands (112).

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