Flame-retardant shielding photoelectric composite cable

Abstract

The application provides a kind of flame-retardant shielding type photoelectric composite cable, relating to cable technical field, including a plurality of insulated cores, flame-retardant layer, shielding layer and outer sheath, also provided with integrated star-shaped central support framework, the star-shaped central support framework includes central positioning cylinder and a plurality of framework branches that are uniformly arranged around the outer periphery of the central positioning cylinder, the adjacent framework branches form arc clamping grooves that are adapted to hold the insulated cores;A plurality of annular pressure support rings are arranged equidistantly along the cable axis on the inner side of the shielding layer, the gap between the insulated cores and the star-shaped central support framework is filled with elastic arc-shaped buffer filling strips;The inner wall of the outer sheath is provided with an axially continuous arc-shaped corrugated groove.The application can fundamentally solve the defects that the traditional flame-retardant shielding cable can only achieve overall pressure flattening by relying on thickened sheath, steel tape armor or hard filling, and cannot inhibit the lateral deviation and one-sided eccentric sliding of the insulated cores under pressure.

Description

Technical Field

[0001] This invention relates to the field of cable technology, and in particular to a flame-retardant shielded optoelectronic composite cable. Background Technology

[0002] Flame-retardant shielded optoelectronic composite cables integrate power transmission, signal communication, flame retardant protection, and electromagnetic shielding functions. They are widely used in industrial automation, intelligent equipment, fire protection buildings, rail transit, and direct burial of cable trays. They not only require good flame retardant and flame-retardant properties, low smoke and flame-retardant characteristics, but also stable electromagnetic shielding capabilities to resist external electromagnetic field interference and ensure stable optoelectronic signal transmission. At the same time, they must be able to adapt to complex working conditions such as on-site laying compression, local heavy pressure, repeated bending, high and low temperature cold and heat cycles, and long-term mechanical micro-vibration.

[0003] Existing conventional flame-retardant shielded cables mostly adopt a multi-layer composite structure in which insulated cores are bundled together and then sequentially covered with a flame-retardant layer, a shielding layer, and an outer sheath. They generally improve compressive strength by thickening the sheath, adding steel tape armor, and using rigid filler ropes to fill gaps. However, the traditional structure only prevents the cable from being flattened as a whole and lacks an internal core centering and restraining structure. Under unilateral compression, cable tray stacking, and direct burial pressure, the insulated cores are prone to lateral slippage and eccentric displacement, causing thinning of the insulation on one side, disrupting the coaxiality of the cable cores, leading to electric field distortion, localized field strength concentration, and micro-discharges during long-term operation. This accelerates the aging of the insulation and flame-retardant layer, and may even induce insulation breakdown. At the same time, the flame-retardant layer is filled with a large amount of inorganic filler material, which is relatively hard and has poor toughness. The insulation, flame retardant, shielding, and sheathing layers are heterogeneous composites with large differences in thermal expansion coefficients and elastic moduli. Under alternating hot and cold conditions and repeated bending, the interlayer shear stress is high, which easily generates micro-air gaps and causes delamination, slippage, and bulging, compromising the overall integrity of flame retardant sealing and shielding. Conventional shielding is mostly a simple combination of ordinary aluminum foil and copper braid, without buffering and stress relief structures. Under bending and vibration, the aluminum foil is prone to cracking, and the braided copper wires are prone to micro-movement wear and breakage, resulting in a decrease in shielding effectiveness and a reduction in anti-interference ability. In addition, the traditional cabling tension is relatively high, and the residual torsional stress in the core is prone to torsional misalignment, which further causes the shielding to become loose and the flame retardant protection to fail, making it difficult to meet the long-term use requirements of flame retardancy, shielding, compression resistance, and bending resistance. Summary of the Invention

[0004] To address the technical problem that existing flame-retardant shielded composite cables can only improve the flattened shape of conventional compression-resistant structures, but cannot solve the hidden defects of internal eccentricity and thinning of insulation on one side, this invention provides a flame-retardant shielded optoelectronic composite cable.

[0005] The technical solutions provided by the embodiments of the present invention are as follows: The present invention provides a flame-retardant shielded optoelectronic composite cable, which includes multiple insulated cores, a flame-retardant layer, a shielding layer and an outer sheath, and also provides an integrated star-shaped central support frame. The star-shaped central support frame includes a central positioning cylinder and several frame supports evenly distributed around the outer periphery of the central positioning cylinder. An arc-shaped clamping groove is formed between adjacent frame supports to fit and hold the insulated cores. The inner side of the shielding layer is provided with several annular pressure-bearing support rings arranged at equal intervals along the cable axis, and the gap between the insulated wire core and the star-shaped central support frame is filled with an elastic arc-shaped buffer filling strip. The inner wall of the outer sheath is provided with an axially continuous arc-shaped corrugated groove; The star-shaped central support frame and the annular pressure-bearing support ring form an inner and outer bidirectional limiting structure, which constrains the lateral displacement of the insulated wire core under pressure, maintains the coaxiality of the cable core, and avoids the insulation from being squeezed and thinned on one side.

[0006] The skeleton support is an elastic support arm structure, and the elastic support arm is integrally formed with the central positioning cylinder. The outer arc surface of the elastic support arm fits and limits the position against the outer wall of the insulated wire core.

[0007] The annular pressure-bearing support ring is a multi-point arched non-closed ring structure. The outer side of the annular pressure-bearing support ring is attached to the inner wall of the shielding layer, and the inner side is positioned directly opposite the star-shaped central support frame.

[0008] The cross-section of the elastic arc-shaped buffer filler strip is crescent-shaped. The two sides of the elastic arc-shaped buffer filler strip are respectively attached to the outer wall of the insulated wire core and the side wall of the skeleton support, and the elastic arc-shaped buffer filler strip itself has a reserved elastic deformation buffer gap.

[0009] The arc-shaped corrugated grooves on the inner wall of the outer sheath are arranged one-to-one with the annular pressure-bearing support ring along the axial direction, forming an external pressure buffer and guide structure.

[0010] The star-shaped central support frame is integrally injection molded from a rigid insulating polymer material, and the frame support has both rigid limiting and slight elastic deformation capabilities.

[0011] The axial spacing between two adjacent annular pressure-bearing support rings is set to 1.2-1.5 times the outer diameter of the cable.

[0012] The shielding layer adopts a composite braided structure of corrugated preformed aluminum foil and fine copper wire, and a flexible buffer wrapping layer is provided between the flame retardant layer and the outer sheath.

[0013] The contact surfaces of the shielding layer and the flame-retardant layer are directly bonded, and circumferential micro-embossed interlocking textures are provided on the contact surfaces of the shielding layer and the flame-retardant layer to form an interlayer mechanical interlocking and limiting structure.

[0014] The multiple insulated wire cores are made of low-tension concentric stranded cable, which, together with the star-shaped central support frame, suppresses the twisting, misalignment and radial slippage of the wire cores.

[0015] The beneficial effects of the technical solutions provided in the embodiments of the present invention include at least the following: In this invention, an integrated star-shaped central support frame, an annular pressure-bearing support ring, and an elastic arc-shaped buffer filling strip are used in conjunction with the arc-shaped corrugated groove on the inner wall of the outer sheath to form a bidirectional mechanical limiting and buffering structure. This fundamentally solves the problem that traditional flame-retardant shielded cables can only achieve overall pressure resistance by relying on thickened sheaths, steel tape armor, or hard filling, and cannot suppress the lateral displacement of the insulated core under pressure or the unilateral eccentric slippage. This invention maintains the coaxiality of the cable core at all times, effectively preventing the insulation layer from thinning on one side due to compression, and eliminating problems such as electric field distortion, local field strength concentration, and micro-discharge aging caused by core eccentricity, thus significantly improving the reliability of cable insulation and long-term service life. Simultaneously, it employs a corrugated preformed aluminum foil and fine copper wire composite shielding structure, with a flexible buffer wrapping layer and circumferential micro-concave-convex interlocking texture between the flame-retardant layer and the shielding layer. This ensures excellent flame-retardant, shielding, and anti-interference performance of the cable, while also buffering interlayer shear stress and suppressing interlayer slippage, fretting wear, and shielding layer cracking and wire breakage under thermal cycling and vibration conditions. Combined with an elastic arc-shaped buffer filler strip and a low-tension concentric cabling structure, it maintains the overall flame-retardant shielding protection level of the cable while also considering the cable's bending flexibility, compression resistance, creep resistance, and bending fatigue resistance. The structure is highly stable and adaptable to complex working conditions such as cable tray laying, direct burial, and dynamic equipment follow-up, effectively compensating for the industry shortcomings of existing flame-retardant shielded composite cables, such as insufficient pressure resistance and centering limiting capabilities, and prominent hidden failure risks. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a flame-retardant shielded optoelectronic composite cable provided in an embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the planar structure of a flame-retardant shielded optoelectronic composite cable provided in an embodiment of the present invention.

[0018] Figure 3 This is a cross-sectional structural diagram of a flame-retardant shielded optoelectronic composite cable provided in an embodiment of the present invention.

[0019] Figure 4 This is a structural diagram illustrating the disassembly of a flame-retardant shielded optoelectronic composite cable provided in an embodiment of the present invention.

[0020] Figure 5 This is a schematic diagram of the star-shaped central support frame of a flame-retardant shielded optoelectronic composite cable provided in an embodiment of the present invention.

[0021] Figure 6This is a schematic diagram of the flame-retardant layer and shielding layer of a flame-retardant shielded optoelectronic composite cable provided in an embodiment of the present invention.

[0022] Figure 7 A flame-retardant shielded optoelectronic composite cable provided in this embodiment of the invention. Figure 6 Enlarged structural diagram at point A in the middle.

[0023] Figure 8 This is a schematic diagram of the internal structure of the outer sheath of a flame-retardant shielded optoelectronic composite cable provided in an embodiment of the present invention.

[0024] Reference numerals: 100, Insulated wire core; 200, Flame retardant layer; 300, Shielding layer; 400, Outer sheath; 500, Star-shaped central support frame; 501, Central positioning cylinder; 502, Frame support; 600, Annular pressure-bearing support ring; 700, Elastic arc-shaped buffer filling strip; 800, Flexible buffer wrapping layer; 900, Arc-shaped clamping groove; 910, Circumferential micro-concave-convex interlocking texture; 920, Arc-shaped corrugated groove. Detailed Implementation

[0025] like Figures 1 to 8 As shown, an embodiment of the present invention provides a flame-retardant shielded optoelectronic composite cable, including multiple insulated cores 100, a flame-retardant layer 200, a shielding layer 300, and an outer sheath 400. It also has an integrated star-shaped central support frame 500. The star-shaped central support frame 500 includes a central positioning cylinder 501 and a plurality of frame supports 502 evenly distributed around the outer periphery of the central positioning cylinder 501. An arc-shaped clamping groove 900 is formed between adjacent frame supports 502 to fit and hold the insulated cores 100. The shielding layer 300 has several annular pressure-bearing support rings 600 arranged at equal intervals along the cable axis on its inner side, and the gap between the insulated wire core 100 and the star-shaped central support frame 500 is filled with an elastic arc-shaped buffer filling strip 700. The inner wall of the outer sheath 400 is provided with an axially continuous arc-shaped corrugated groove 920; The star-shaped central support frame 500 and the annular pressure-bearing support ring 600 form an inner and outer bidirectional limiting structure, which restricts the lateral displacement of the insulated wire core 100 under pressure, maintains the coaxiality of the cable core, and avoids the insulation from being squeezed and thinned on one side.

[0026] Furthermore, during cable laying and under pressure conditions, multiple insulated cores 100 are respectively inserted into the star-shaped central support frame 500, forming an isolated star-shaped clamping groove with adjacent frame supports 502, and the central positioning cylinder 501 achieves overall central positioning. After the external pressure is transmitted to the outer sheath 400 and the flame-retardant layer 200, the pressure is first distributed by the annular pressure-bearing support rings 600 arranged axially at equal intervals on the inner side of the shielding layer 300; the star-shaped central support frame 500 and the annular pressure-bearing support rings 600 form an inner and outer bidirectional mechanical limiting frame, and the elastic arc-shaped buffer filling strips 700 at the gaps fill the pores and adaptively deform and buffer; the arc-shaped corrugated grooves 920 on the inner wall of the outer sheath 400 can guide and unload the external compressive stress, avoiding stress concentration and vertical inward compression of the cable core. This solution addresses the problem that existing cables, relying solely on thickened sheaths and steel tape armor, can only prevent overall flattening and cannot constrain lateral slippage and eccentric tilting of the insulated core under pressure. It also eliminates the defects of unilateral compression causing thinning of the insulation on one side and failure of cable core coaxiality. Furthermore, it avoids electric field distortion and excessively high local field strength caused by core eccentricity, structurally reducing the risk of insulation breakdown and partial discharge aging. It also addresses the hidden failure problem of traditional rigid-filled cables with no buffer and prone to rigid compression under stress.

[0027] The skeleton support 502 is an elastic support arm structure, and the elastic support arm is integrally formed with the central positioning cylinder 501. The outer arc surface of the elastic support arm fits and limits the outer wall of the insulated wire core 100.

[0028] Furthermore, when the cable is bent, vibrated, or slightly compressed, the elastic support arm maintains its overall position by relying on the central positioning cylinder 501; the elastic support arm, relying on its own slight elastic deformation, adheres tightly to and hugs the outer wall of the insulated core 100, maintaining rigid limitation and preventing deviation, while also undergoing slight adaptive deformation as the cable bends; it always maintains a tight fit between the insulated core 100 and the skeleton support 502 without gaps, preventing the core from shifting or rotating within the clamping groove. This solves the problems of rigid support structures having no deformation allowance and the insulation layer being easily damaged by the rigid pressure on the insulated core 100 during bending; it also prevents the problem of micro-slippage of the core and frictional wear of the insulation caused by the loose fit between the ordinary skeleton and the core during vibration.

[0029] The annular pressure-bearing support ring 600 is a multi-point arched non-closed ring structure. The outer side of the annular pressure-bearing support ring 600 is attached to the inner wall of the shielding layer 300, and the inner side is positioned directly opposite the star-shaped central support frame 500.

[0030] Furthermore, when the cable is subjected to heavy pressure, cable tray compression, or direct burial soil compression, the external force acts on the outer sheath 400 and flame-retardant layer 200 before being transferred to the shielding layer 300. The multi-point arched annular pressure-bearing support ring 600 first bears the concentrated load, dispersing the single-point compressive stress into a circumferentially multi-point uniform force. The non-closed ring retains bending deformation allowance and does not restrict the normal bending of the cable. The inner side of the annular pressure-bearing support ring 600 is directly opposite the star-shaped central support frame 500, transmitting the dispersed pressure to the entire frame and preventing local stress from directly acting on the single insulated core 100. This solves the problems of excessive rigidity, large bending radius, and poor flexibility of the closed support ring. At the same time, it prevents the problem of traditional pressure-resistant structures where the force is concentrated at a single point, which can easily cause the shielding layer 300 to dent and the core to be locally compressed. It also achieves uniform pressure distribution, preventing the shielding layer 300 from collapsing and wrinkling inward and the shielding energy dissipation from decreasing.

[0031] The cross-section of the elastic arc-shaped buffer filler strip 700 is crescent-shaped. The two sides of the elastic arc-shaped buffer filler strip 700 are respectively attached to the outer wall of the insulated wire core 100 and the side wall of the skeleton support 502, and the elastic arc-shaped buffer filler strip 700 itself has a reserved elastic deformation buffer gap.

[0032] Furthermore, after the cable is cabled, the crescent-shaped elastic arc-shaped buffer filler strip 700 is naturally embedded between the core and the skeleton. In a static state, it fills the gap and fixes the position of the core, preventing the cable from loosening and twisting. When subjected to pressure, temperature changes, or bending, the elastic arc-shaped buffer filler strip 700 absorbs shear stress through its own elastic deformation and expands and contracts adaptively through the reserved gap; it buffers the radial shear force between layers, so that the insulated core 100 and the skeleton support 502 deform synchronously under stress. This solves the problems of traditional rigid filler ropes having no elasticity, no margin for temperature expansion and contraction, and being easily damaged by compression; at the same time, it avoids the radial shear stress generated when the multi-layer structure is bent, which can cause gradual separation and peeling between layers, suppresses the micro-slippage between the core and the skeleton, and reduces wear and aging caused by long-term vibration.

[0033] The arc-shaped corrugated grooves 920 on the inner wall of the outer sheath 400 and the annular pressure-bearing support ring 600 are arranged one-to-one along the axial direction to form an external pressure buffer and guide structure.

[0034] Furthermore, when external impact and compressive loads act on the surface of the outer sheath 400, the stress is first transmitted to the inner wall's arc-shaped corrugated groove 920. The corrugated groove forms a flexible buffer zone, which can undergo slight indentation deformation to absorb impact energy. The stress is dispersed along the circumference of the corrugations and accurately transferred to the lower annular pressure-bearing support ring 600 for stress relief. This solves the problem of stress vertically concentrating inward under pressure when the flat inner sheath is compressed, directly addressing the issue of cable core compression. It also solves the problem of localized pressure not being able to be distributed, which can easily cause single-point flattening and lead to core eccentricity.

[0035] The star-shaped central support frame 500 is integrally injection molded from a rigid insulating polymer material, and the frame support 502 has both rigid limiting and slight elastic deformation capabilities.

[0036] Furthermore, the integrated injection molding ensures the overall structural strength and coaxial accuracy of the star-shaped central support frame 500, and the insulating material does not interfere with electrical performance. The frame as a whole provides rigid support, resisting deformation and displacement caused by external pressure. The frame support 502 retains a small amount of elasticity to adapt to cable bending and temperature deformation, without brittleness or deformation. This solves the problems of insufficient strength of ordinary plastic supports, easy deformation under pressure, and loss of coaxiality; it also prevents the problem of conductive interference shielding of metal supports affecting electrical insulation performance.

[0037] The axial spacing between two adjacent annular pressure-bearing support rings 600 is set to 1.2-1.5 times the outer diameter of the cable.

[0038] Furthermore, the annular pressure-bearing support rings 600 are arranged proportionally and at equal intervals to ensure uniform distribution of axial compressive support across all sections of the cable. Excessive spacing leads to unsupported sections in the middle that are prone to denting, while insufficient spacing results in structural redundancy, cable stiffening, and increased costs. A ratio of 1.2 to 1.5 times the outer diameter achieves a balance between full axial support coverage, retained flexibility, and lightweight structure. This solves the problems of irregular arrangement of the annular pressure-bearing support rings 600, and the tendency for unsupported sections to dent under pressure and become eccentric.

[0039] The shielding layer 300 adopts a composite braided structure of wave-shaped preformed aluminum foil and fine copper wire, and a flexible buffer wrapping layer 800 is provided between the flame-retardant layer 200 and the outer sheath 400.

[0040] Furthermore, the pre-formed corrugated aluminum foil allows for bending and stretching, enabling it to expand with the cable during bending and preventing cracking from excessive stretching. Fine copper wire braiding enhances shielding coverage and resistance to bending fatigue. The intermediate flexible buffer wrapping layer 800 isolates the flame-retardant layer 200 from the outer sheath 400, filling the tiny gaps between layers and buffering mutual friction and shear stress. This solves the problems of easy cracking and a sudden drop in shielding energy dissipation associated with straight, longitudinally wrapped aluminum foil. It also prevents hard contact between the shielding layer 300 and the flame-retardant layer 200, reducing fretting wear and progressive wire breakage during bending and vibration, and decreasing interlayer friction. This improves the bending fatigue life of the shielding layer 300 and maintains long-term anti-interference performance.

[0041] The contact surfaces of the shielding layer 300 and the flame-retardant layer 200 are directly bonded, and circumferential micro-concave-convex interlocking textures 910 are provided on the contact surfaces of the shielding layer 300 and the flame-retardant layer 200 to form an interlayer mechanical interlocking and limiting structure.

[0042] Furthermore, during cable bending and thermal cycling, the two layers interlock and are restrained by circumferential micro-interlocking grooves 910; this restricts relative circumferential and axial slippage between the layers, ensuring synchronized and coordinated deformation of the two layers; the concave-convex structure increases interfacial friction and disperses interlayer shear stress. This solves the problem of large differences in the thermal expansion coefficients of multilayered materials of different materials, leading to micro-gap and air gap discharge due to temperature changes; and avoids the phenomenon of traditional smooth-surfaced layers relying solely on adhesion, which is prone to delamination, slippage, and bulging under stress.

[0043] The multiple insulated wire cores 100 are made of low-tension concentric stranded cable, which, together with the star-shaped central support frame 500, suppresses the twisting and misalignment of the wire cores and radial slippage.

[0044] Furthermore, low-tension concentric stranding reduces the internal torsional stress of the core itself, allowing it to self-twist and misalign in the later stages; it also prevents the problem of core displacement and 300° twisting and loosening of the shielding layer caused by uneven cable tension. It suppresses core torsion and radial slippage from the source of cable formation, and together with the central skeleton, it maintains structural stability in the long term.

[0045] The beneficial effects of the technical solutions provided in the embodiments of the present invention include at least the following: In this invention, an integrated star-shaped central support frame, an annular pressure-bearing support ring, and an elastic arc-shaped buffer filling strip are used in conjunction with the arc-shaped corrugated groove on the inner wall of the outer sheath to form a bidirectional mechanical limiting and buffering structure. This fundamentally solves the problem that traditional flame-retardant shielded cables can only achieve overall pressure resistance by relying on thickened sheaths, steel tape armor, or hard filling, and cannot suppress the lateral displacement of the insulated core under pressure or the unilateral eccentric slippage. This invention maintains the coaxiality of the cable core at all times, effectively preventing the insulation layer from thinning on one side due to compression, and eliminating problems such as electric field distortion, local field strength concentration, and micro-discharge aging caused by core eccentricity, thus significantly improving the reliability of cable insulation and long-term service life. Simultaneously, it employs a corrugated preformed aluminum foil and fine copper wire composite shielding structure, with a flexible buffer wrapping layer and circumferential micro-concave-convex interlocking texture between the flame-retardant layer and the shielding layer. This ensures excellent flame-retardant, shielding, and anti-interference performance of the cable, while also buffering interlayer shear stress and suppressing interlayer slippage, fretting wear, and shielding layer cracking and wire breakage under thermal cycling and vibration conditions. Combined with an elastic arc-shaped buffer filler strip and a low-tension concentric cabling structure, it maintains the overall flame-retardant shielding protection level of the cable while also considering the cable's bending flexibility, compression resistance, creep resistance, and bending fatigue resistance. The structure is highly stable and adaptable to complex working conditions such as cable tray laying, direct burial, and dynamic equipment follow-up, effectively compensating for the industry shortcomings of existing flame-retardant shielded composite cables, such as insufficient pressure resistance and centering limiting capabilities, and prominent hidden failure risks.

[0046] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. The scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A flame-retardant shielded optoelectronic composite cable, comprising multiple insulated cores, a flame-retardant layer, a shielding layer, and an outer sheath, characterized in that, It also features an integrated star-shaped central support frame, which includes a central positioning cylinder and several frame supports evenly distributed around the outer periphery of the central positioning cylinder. An arc-shaped clamping groove is formed between adjacent frame supports to accommodate and hold the insulated wire core. The inner side of the shielding layer is provided with several annular pressure-bearing support rings arranged at equal intervals along the cable axis, and the gap between the insulated wire core and the star-shaped central support frame is filled with an elastic arc-shaped buffer filling strip. The inner wall of the outer sheath is provided with an axially continuous arc-shaped corrugated groove; The star-shaped central support frame and the annular pressure-bearing support ring form an inner and outer bidirectional limiting structure, which constrains the lateral displacement of the insulated wire core under pressure, maintains the coaxiality of the cable core, and avoids the insulation from being squeezed and thinned on one side. The skeleton support is an elastic support arm structure, and the elastic support arm is integrally formed with the central positioning cylinder. The outer arc surface of the elastic support arm fits and limits the position against the outer wall of the insulated wire core. The annular pressure-bearing support ring is a multi-point arched non-closed ring structure. The outer side of the annular pressure-bearing support ring is attached to the inner wall of the shielding layer, and the inner side is positioned directly opposite the star-shaped central support frame. The cross-section of the elastic arc-shaped buffer filler strip is crescent-shaped. The two sides of the elastic arc-shaped buffer filler strip are respectively attached to the outer wall of the insulated wire core and the side wall of the skeleton support. The elastic arc-shaped buffer filler strip itself has a reserved elastic deformation buffer gap. The arc-shaped corrugated grooves on the inner wall of the outer sheath are arranged one-to-one with the annular pressure-bearing support ring along the axial direction, forming an external pressure buffer and guide structure. The star-shaped central support frame is integrally injection molded from a rigid insulating polymer material, and the frame support has both rigid limiting and slight elastic deformation capabilities. The axial spacing between two adjacent annular pressure-bearing support rings is set to 1.2-1.5 times the outer diameter of the cable.

2. The flame-retardant shielded optoelectronic composite cable according to claim 1, characterized in that, The shielding layer adopts a composite braided structure of corrugated preformed aluminum foil and fine copper wire, and a flexible buffer wrapping layer is provided between the flame retardant layer and the outer sheath.

3. The flame-retardant shielded optoelectronic composite cable according to claim 1, characterized in that, The contact surfaces of the shielding layer and the flame-retardant layer are directly bonded, and circumferential micro-embossed interlocking textures are provided on the contact surfaces of the shielding layer and the flame-retardant layer to form an interlayer mechanical interlocking and limiting structure.

4. The flame-retardant shielded optoelectronic composite cable according to claim 1, characterized in that, The multiple insulated wire cores are made of low-tension concentric stranded cable, which, together with the star-shaped central support frame, suppresses the twisting, misalignment and radial slippage of the wire cores.

Images