Fire resistant braided wire of flame retardant silicone rubber

Abstract

This invention provides a fire-retardant silicone rubber braided cable, comprising: a central cable core woven from high-strength aramid fiber or ultra-high molecular weight polyethylene; at least one protective shell unit fitted around the outer side of the central cable core; wherein the protective shell unit is formed by splicing together at least two arc-shaped pieces around the central cable core axially; one edge of each arc-shaped piece along its length is provided with a snap-fit ​​protrusion, and the other edge is provided with a snap-fit ​​groove that mates with the snap-fit ​​protrusion, so that adjacent arc-shaped pieces can be fastened and fixed. This invention adopts a segmented protective shell unit structure, and the units are connected by a spherical universal joint consisting of a "rotating ball head" and a "receiving cavity". This design allows the entire cable to have excellent flexibility and a very small bending radius while providing strong protection with a rigid shell.

Description

Technical Field

[0001] This utility model relates to the field of cables, specifically a fire-resistant and flame-retardant silicone rubber braided wire. Background Technology

[0002] Traditional flame-retardant cables typically improve their fire resistance by adding flame retardants to the outer sheath. However, when exposed to high temperatures or open flames, the outer sheath material of these cables decomposes or melts, significantly reducing their flame-retardant effect and potentially releasing harmful fumes and toxic gases. Furthermore, in real-world applications, different parts of the cable face varying fire risks and require different fire resistance levels. For example, areas near heat sources or flammable materials require stronger fire protection; applying high-strength flame-retardant treatment to the entire cable would not only significantly increase manufacturing costs but also lead to material waste.

[0003] On the other hand, many high-strength specialty cables, such as those used in industrial hoisting, robotics, or aerospace, require both excellent tensile strength and a certain degree of flexibility to adapt to complex installation and usage environments. In existing technologies, steel wire rope or polymer materials are often used as the load-bearing core to improve cable strength, supplemented by a polymer sheath. However, this structure has limited flame-retardant properties in the outer sheath when exposed to fire, failing to effectively protect the internal load-bearing core and conductor.

[0004] Furthermore, the high overall rigidity of the sheath in existing technologies limits the bending radius of the cable. This poses challenges to its wiring and use in situations requiring frequent bending or passage through narrow spaces, and may even lead to damage to the internal conductors due to bending fatigue. Utility Model Content

[0005] The main purpose of this utility model is to provide a fire-retardant silicone rubber braided wire to solve the problems of limited fire resistance, release of harmful gases, difficulty in balancing the protective properties and flexibility of high-strength cables, and high cost in the background technology.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A fire-retardant silicone rubber braided thread, comprising: Central cable core, At least one protective shell unit is fitted on the outside of the central cable core, wherein the protective shell unit is formed by splicing together at least two arc plates around the central cable core along its axial direction. The arc piece has a snap-fit ​​protrusion on one side edge along its length direction, and a snap-fit ​​groove on the other side edge that mates with the snap-fit ​​protrusion, so that adjacent arc pieces can be fastened and fixed. A connecting unit is also provided between adjacent protective shell units. Both ends of the protective shell unit are fixed with rotating ball heads by support parts. The connecting unit is provided with a receiving cavity for accommodating the rotating ball heads. The connecting unit is provided with multiple clamping blocks that can slide along its radial direction. The clamping blocks are used to fix the connecting unit to the central cable core. A porous ceramic block is provided on the side of the arc plate facing the central cable core.

[0007] As a further optimization of this utility model, the connecting unit includes a main block, on which a moving ring is rotatably disposed, and multiple arc-shaped grooves are arranged circumferentially on the moving ring, and the clamping block is slidably disposed in the arc-shaped grooves.

[0008] As a further optimization of this utility model, the moving ring can also slide along the axial direction of the main body block, and the main body block is provided with a limiting protrusion for limiting the rotation of the moving ring; the main body block is also provided with a push spring, which causes the moving ring to have a tendency to move closer to the limiting protrusion.

[0009] As a further optimization of this utility model, the number of arc plates is 3.

[0010] As a further optimization of this utility model, the porous ceramic block is made of alumina or zirconium oxide, and its porosity is 50%-80%.

[0011] As a further optimization of this utility model, a silicone rubber heat shrink sleeve is also fitted on the outside of the protective shell unit.

[0012] As a further optimization of this utility model, the central cable core is an aramid fiber braided rope, and at least one copper core conductor is provided inside it.

[0013] Compared with the prior art, the present invention has the following significant advantages: 1. Superior fire resistance: By setting porous ceramic blocks made of alumina or zirconium oxide on the inner side of the protective shell, a physical heat insulation barrier resistant to ultra-high temperatures is formed. Compared with traditional polymer sheaths that rely on chemical flame retardants, this invention will not melt or decompose in a flame, does not produce toxic fumes, and can more effectively protect the structural integrity of the internal cable core.

[0014] 2. Combining rigid protection with high flexibility: This utility model adopts a segmented protective shell unit structure, and the units are connected by a spherical universal joint consisting of a "rotating ball head" and a "receiving cavity". This design allows the entire cable to have the strong protection of a rigid shell while still possessing excellent flexibility and a very small bending radius, perfectly adapting to complex working conditions such as robot joints that require frequent bending.

[0015] 3. Modular design, controllable cost: Both the protective shell unit and the connection unit are independent modules, which can be installed only in high-risk sections of the cable according to actual needs. This "protection on demand" strategy avoids over-protecting the entire cable, significantly reducing material costs and overall weight. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional structural cross-sectional view of an embodiment of the present invention (the silicone rubber heat shrink sleeve is omitted). Figure 2 This is a schematic diagram of the arc sheet in one embodiment of the present invention; Figure 3 This is a cross-sectional view of the connecting unit in one direction according to an embodiment of the present invention; Figure 4 This is a cross-sectional view of the connecting unit in another direction in one embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures: 1. Central cable core; 11. Copper core conductor; 2. Protective shell unit; 21. Arc plate; 211. Snap-fit ​​protrusion; 212. Snap-fit ​​groove; 213. Porous ceramic block; 22. Rotating ball head; 3. Connecting unit; 31. Main body block; 311. Restricting protrusion; 32. Receiving cavity; 33. Moving ring; 331. Arc groove; 34. Clamping block; 35. Pushing spring. Detailed Implementation

[0019] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent. To better illustrate this embodiment, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product.

[0020] It will be understood by those skilled in the art that certain well-known structures and their descriptions may be omitted in the accompanying drawings. The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0021] Example 1 like Figure 1 As shown, this utility model provides a fireproof and flame-retardant silicone rubber braided wire, the main structure of which consists of a central cable core 10, multiple protective shell units 2 distributed along its length, and connecting units 3 connecting adjacent protective shell units 2.

[0022] Please see Figure 2 The protective shell unit 2 is a rigid protective structure that wraps around the central cable core 10. In this embodiment, each protective shell unit 2 is composed of three arc-shaped pieces 21 spliced ​​together. Each arc-shaped piece 21 has a snap-fit ​​protrusion 211 on one side edge along its length direction, and a matching snap-fit ​​groove 212 on the other side edge. During installation, the three arc-shaped pieces 21 are wrapped around the central cable core 10, and a complete tubular protective shell can be quickly and firmly assembled by the snap-fit ​​protrusion 211 and the snap-fit ​​groove 212.

[0023] On the inner surface of each arc plate 21 facing the central cable core 10, a porous ceramic block 22 is fixed. This porous ceramic block 22 is preferably made of an inorganic non-metallic material resistant to ultra-high temperatures, such as alumina or zirconium oxide, with a porosity between 50% and 80%, providing excellent heat insulation and fireproofing, and is the core fireproof component of this invention. Rotating ball heads 22 for connection are also fixed at both ends of the protective shell unit 2.

[0024] The central cable core 10 serves as the main load-bearing and conductive component, preferably an aramid fiber braided rope, and may contain one or more copper core conductors (not shown in the figure) as needed. Aramid fibers provide extremely high tensile strength.

[0025] Please see Figure 3 and Figure 4 The connecting unit 3 is used to connect two adjacent protective shell units 2 and enable flexible rotation. The connecting unit 3 includes a main body block 31, with receiving cavities 32 at both ends of the main body block 31 for accommodating the rotating ball head 22. Multiple clamping blocks 34 that can slide radially are disposed inside the main body block 31. To drive the clamping blocks 34, a rotatable moving ring 33 is fitted onto the main body block 31. The moving ring 33 has several circumferentially arrayed arc-shaped grooves 331, and the tail of the clamping block 34 is slidably disposed within these arc-shaped grooves 331. When the worker rotates the moving ring 33, the helical guiding effect of the arc-shaped grooves 331 forces the clamping blocks 34 to move inward or outward simultaneously, thereby clamping or releasing the central cable core 10.

[0026] To prevent accidental rotation of the moving ring 33 during use, a locking mechanism is also provided in this embodiment. A limiting protrusion 311 is provided on the main body block 31, and a corresponding notch (not shown in the figure) is provided on the moving ring 33. A push spring 35 constantly pushes the moving ring 33, causing its notch to engage with the limiting protrusion 311, thereby locking the position of the moving ring 33. When it is necessary to adjust the clamping force, simply press the moving ring 33 axially to overcome the spring force, causing it to disengage from the limiting protrusion 311, and it can then rotate freely.

[0027] like Figure 2As shown, the rotating ball head 22 of the protective shell unit 2 is placed in the receiving cavity 32 of the connecting unit 3, forming a spherical universal joint. This allows the cable to achieve multi-degree-of-freedom bending and twisting at the connection point while being covered by a rigid protective shell, providing extremely high flexibility.

[0028] After all the protective shell units 2 and connecting units 3 are installed, a layer of silicone rubber heat shrink sleeve 40 can be fitted on the outermost side (e.g., Figure 1 (as shown), to provide overall electrical insulation, waterproof sealing and abrasion-resistant protection.

[0029] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A fire-retardant silicone rubber braided thread, characterized in that, include: Central cable core, At least one protective shell unit is fitted on the outside of the central cable core, wherein the protective shell unit is formed by splicing together at least two arc plates around the central cable core along its axial direction. The arc piece has a snap-fit ​​protrusion on one side edge along its length direction, and a snap-fit ​​groove on the other side edge that mates with the snap-fit ​​protrusion, so that adjacent arc pieces can be fastened and fixed. A connecting unit is also provided between adjacent protective shell units. Both ends of the protective shell unit are fixed with rotating ball heads by support parts. The connecting unit is provided with a receiving cavity for accommodating the rotating ball heads. The connecting unit is provided with multiple clamping blocks that can slide along its radial direction. The clamping blocks are used to fix the connecting unit to the central cable core. A porous ceramic block is provided on the side of the arc plate facing the central cable core.

2. The fire-retardant silicone rubber braided thread according to claim 1, characterized in that, The connecting unit includes a main block, on which a moving ring is rotatably disposed, and multiple arc-shaped grooves are arranged in a circumferential array on the moving ring, and the clamping block is slidably disposed in the arc-shaped grooves.

3. A fire resistant, flame retarded silicone rubber braided cord according to claim 2, characterised in that, The moving ring can also slide along the axial direction of the main body block, and the main body block is provided with a limiting protrusion for restricting the rotation of the moving ring; The main block is also provided with a push spring, which causes the moving ring to have a tendency to move closer to the limiting protrusion.

4. A fire resistant, flame retarded silicone rubber braided cord according to claim 1, characterised in that, The number of arc plates is 3.

5. A fire resistant, flame retarded silicone rubber braided cord according to claim 1, wherein, The porous ceramic block is made of alumina or zirconium oxide and has a porosity of 50%-80%.

6. A fire resistant, flame retarded silicone rubber braided cord according to claim 1, wherein, The outer side of the protective shell unit is also fitted with a silicone rubber heat shrink sleeve.

7. A fire resistant, flame retarded silicone rubber braided cord according to claim 1, wherein, The central cable core is an aramid fiber braided rope, and at least one copper core conductor is installed inside it.

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