Lightweight anti-attenuation 16-core three-layer shielding coaxial cable

Abstract

The utility model discloses a lightweight anti-attenuation 16-core three-layer shielding coaxial cable which comprises 16 coaxial cable cores which are arranged in a square shape and form a cable core together with a polyester staple fiber buffer core material. The coaxial cable core comprises a central conductor, a foaming FEP insulating layer, a copper-plastic composite longitudinal wrapping inner shielding layer, a tinned copper wire braided middle shielding layer, a copper-plastic composite wrapping outer shielding layer and a polyurethane coating layer, and the shielding density of the tinned copper wire braided middle shielding layer is 40-60%; a para-position type wholly aromatic copolyamide stretched fiber woven isolation net and an irradiation crosslinking high-density polyethylene outer sheath layer are sequentially coated outside the cable core. The coaxial cable has good flexibility, the shielding layer is optimized to be of a three-layer shielding structure, the attenuation resistance is enhanced, meanwhile, the copper wire consumption and the material cost are reduced, and light-weight production is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, and in particular to a lightweight, anti-attenuation 16-core triple-layer shielded coaxial cable. Background Art

[0002] Coaxial cable is one of the main types of wires and cables. The industrial application environment is complex, and the radiation or conduction of electromagnetic noise (EMI) may seriously interfere with the normal operation of the equipment. In this process, an important carrier of electromagnetic noise transmission is the various cables used in the production line equipment. In automated industrial manufacturing production lines, coaxial cables are required for the electrical connection and control of small robots and electronic machines. The shielding layer of coaxial cable is usually a double shielding structure of copper foil shielding and metal wire braiding shielding. The gaps in the metal wire braiding shielding layer are prone to leakage or signal interference, and the attenuation resistance is poor. Generally, the braiding density is increased to make the shielding density above 90%. However, this leads to an increase in the amount of metal wire used, increasing the weight of the cable and the material cost, which is not conducive to the development trend of lightweight cable production. Utility Model Content

[0003] The utility model aims to solve the technical problem of providing a lightweight, anti-attenuation 16-core three-layer shielded coaxial cable in response to the deficiencies of the existing technology, which has good flexibility, optimizes the shielding layer to a three-layer shielding structure, enhances the anti-attenuation performance, reduces the amount of copper wire and material costs, and realizes lightweight production.

[0004] The utility model solves the above technical problems through the following technical solutions.

[0005] Lightweight anti-attenuation 16-core three-layer shielded coaxial cable, including 16 coaxial cores arranged in a square and formed with polyester staple fiber buffer core material. The coaxial core includes a central conductor, a foamed FEP insulation layer, a copper-plastic composite longitudinally wrapped inner shielding layer, a tinned copper wire braided intermediate shielding layer, a copper-plastic composite wrapped outer shielding layer and a polyurethane coating layer. The diameter of the central conductor is 0.1mm to 0.5mm, the outer diameter of the foamed FEP insulation layer is 1.6mm to 2.2mm, and the copper-plastic composite longitudinally wrapped inner shielding layer is copper-plastic. The composite tape has a longitudinally overlapping wrapping structure, and the copper-plastic composite wrapping outer shielding layer is a spirally overlapping wrapping structure of the copper-plastic composite tape. The copper-plastic composite tape includes a polyimide film base layer and a copper foil layer. The thickness of the polyimide film base layer is 10μm to 150μm, the thickness of the copper foil layer is 1μm to 25μm, the shielding density of the tinned copper wire braided intermediate shielding layer is 40% to 60%, and the outside of the cable core is sequentially coated with a para-type wholly aromatic copolyamide stretched fiber braided isolation net and an irradiated cross-linked high-density polyethylene outer sheath layer.

[0006] Preferably, the central conductor is formed by concentrically twisting a number of tinned copper monofilaments with a wire diameter of 0.02 mm to 0.1 mm.

[0007] Preferably, the copper foil layer has a thickness of 3 μm to 10 μm, and the outer surface roughness of the copper foil layer does not exceed 1 μm.

[0008] Preferably, the tinned copper wire braided intermediate shielding layer is formed by weaving a plurality of polyester fiber copper foil wires and tinned copper wires in counter-rotating spirals.

[0009] Preferably, the diameter of the polyester fiber copper foil wire is different from that of the tinned copper wire, and the diameter ratio is between 0.85 and 1.

[0010] Preferably, the thickness of the polyimide film base layer is 20 μm to 60 μm.

[0011] Preferably, the para-type wholly aromatic copolyamide stretched fiber woven isolation net is composed of an inner and outer double layer of para-type wholly aromatic copolyamide stretched fiber strands woven in counter-rotating spirals, and the diameter of the inner layer of para-type wholly aromatic copolyamide stretched fiber strands is smaller than the diameter of the outer layer of para-type wholly aromatic copolyamide stretched fiber strands.

[0012] Preferably, the para-type wholly aromatic copolyamide stretched fiber woven isolation mesh has a thickness of 0.1 mm to 0.3 mm.

[0013] Preferably, the inner surface of the radiation cross-linked high-density polyethylene outer sheath layer is provided with a thermoplastic EVA adhesive layer.

[0014] Preferably, the thickness of the radiation cross-linked high-density polyethylene outer sheath layer is 0.45 mm to 2 mm.

[0015] Beneficial effects of the utility model:

[0016] 1. The three-layer shielding structure, formed by a copper-plastic composite longitudinally wrapped inner shield layer, a tinned copper wire braided intermediate shield layer, and a copper-plastic composite wrapped outer shield layer, reduces the shielding density of the tinned copper wire braided intermediate shield layer to 40% to 60%, effectively reducing the braiding density of the tinned copper wire and significantly reducing the amount of tinned copper wire used, achieving lightweight production. The copper foil layers of the copper-plastic composite longitudinally wrapped inner shield layer and the copper-plastic composite wrapped outer shield layer, in contact with the tinned copper wire braided intermediate shield layer, form a shielding structure that offers enhanced attenuation resistance and ensures stable and reliable shielding performance. The longitudinally wrapped structure of the copper-plastic composite longitudinally wrapped inner shield layer offers enhanced bending resistance while maintaining excellent flexibility. The outer surface roughness of the copper foil layers of the copper-plastic composite longitudinally wrapped inner shield layer and the copper-plastic composite wrapped outer shield layer does not exceed 1μm. This helps reduce friction between the copper foil layers and the tinned copper wire braided intermediate shield layer when subjected to bending, alleviating stress concentration in the copper foil and inhibiting cracking in the copper foil, reducing signal transmission attenuation, improving attenuation resistance, and enhancing durability.

[0017] 2. The copper-plastic composite tape uses polyimide film. The dielectric constant of the foamed FEP insulation layer is higher than that of the polyimide film, which helps to improve the high-frequency signal transmission characteristics of the cable. The thermal expansion coefficient of the polyimide film is smaller than that of the foamed FEP outer insulation layer and larger than that of the copper foil layer. The thermal expansion coefficient deviation between the polyimide film and the copper foil layer is smaller. When the cable is in working condition, it is beneficial to suppress excessive thermal expansion of the copper foil layer, reduce thermal stress, and thus avoid cracking and failure of the copper foil layer. It has better anti-attenuation performance, ensures stable and reliable shielding performance, and durable use.

[0018] 3. The cable core is formed by 16 coaxial cores arranged in a square structure and together with the polyester staple fiber buffer core material, ensuring that the cross-sectional structure of the cable core is more rounded and balanced, which helps to withstand lateral pressure during bending and improve the flexibility and bending resistance of the cable. At the same time, by adding a para-type fully aromatic copolyamide stretched fiber woven isolation net to strengthen the fixed cable core structure, it prevents deformation of the cable core structure and loosening of each coaxial core. The para-type fully aromatic copolyamide stretched fiber woven isolation net and the radiation cross-linked high-density polyethylene outer sheath layer are bonded into one through the thermoplastic EVA adhesive layer, thereby improving the structural strength of the outer sheath layer. When bent, it is not easy to tear or damage, and gaps are not easy to form, which is beneficial to miniaturized structural design. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the following will briefly introduce the practical drawings required in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a schematic diagram of the cross-sectional structure of an embodiment of the present application.

[0021] In the figure: 1-coaxial core, 2-polyester staple fiber buffer core material, 3-center conductor, 4-foamed FEP insulation layer, 5-copper-plastic composite longitudinally wrapped inner shield layer, 6-tinned copper wire braided intermediate shield layer, 7-copper-plastic composite wrapped outer shield layer, 8-polyurethane covering layer, 9-para-type fully aromatic copolyamide stretched fiber braided isolation mesh, 10-irradiated cross-linked high-density polyethylene outer sheath layer. DETAILED DESCRIPTION

[0022] The present invention will be described in further detail below through specific embodiments in conjunction with the accompanying drawings.

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described in combination with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0024] like Figure 1 As shown, the lightweight, attenuation-resistant 16-core, three-layer shielded coaxial cable of the present invention comprises 16 coaxial cores 1 arranged in a square and formed together with a polyester staple fiber buffer core 2 to form the cable core. The coaxial core 1 comprises a center conductor 3, a foamed FEP insulation layer 4, a copper-plastic composite longitudinally wrapped inner shielding layer 5, a tinned copper wire braided intermediate shielding layer 6, a copper-plastic composite wrapped outer shielding layer 7, and a polyurethane sheathing layer 8. The center conductor 3 has a diameter of 0.1 mm to 0.5 mm. Specifically, the center conductor 3 is formed by concentrically twisting several tinned copper monofilaments with a wire diameter of 0.02 mm to 0.1 mm. The outer diameter of the foamed FEP insulation layer 4 is 1.6 mm to 2.2 mm. The copper-plastic composite longitudinally wrapped inner shielding layer 5 is a copper-plastic composite tape longitudinally overlapped wrapped structure. The copper-plastic composite wrapped outer shielding layer 7 is a copper-plastic composite tape spirally overlapped wrapped structure. The copper-plastic composite tape includes a polyimide film base layer and a copper foil layer. The thickness of the polyimide film base layer is 10 μm to 150 μm, preferably, the thickness of the polyimide film base layer is 20 μm to 60 μm. The thickness of the copper foil layer is 1 μm to 25 μm, preferably, the thickness of the copper foil layer is 3 μm to 10 μm, and the outer surface roughness of the copper foil layer does not exceed 1 μm. The shielding density of the tinned copper wire braided intermediate shielding layer 6 is 40% to 60%. In one embodiment, the tinned copper wire braided intermediate shielding layer 6 is formed by a plurality of polyester fiber copper foil wires and tinned copper wires being woven together in counter-rotating spirals. Furthermore, the diameter of the polyester fiber copper foil wire is different from that of the tinned copper wire, and the diameter ratio is between 0.85 and 1.

[0025] The cable core is coated with a para-type fully aromatic copolyamide stretched fiber woven isolation net 9 and an irradiation cross-linked high-density polyethylene outer sheath layer 10 in sequence. Furthermore, the inner surface of the irradiation cross-linked high-density polyethylene outer sheath layer 10 is provided with a thermoplastic EVA adhesive layer. In one embodiment, the para-type fully aromatic copolyamide stretched fiber woven isolation net (9) is composed of an inner and outer double layer of para-type fully aromatic copolyamide stretched fiber strands that are mutually reversely spirally wound and woven. The diameter of the inner layer of para-type fully aromatic copolyamide stretched fiber strands is smaller than the diameter of the outer layer of para-type fully aromatic copolyamide stretched fiber strands. The thickness of the para-type fully aromatic copolyamide stretched fiber woven isolation net 9 is 0.1mm to 0.3mm. The thickness of the irradiation cross-linked high-density polyethylene outer sheath layer 10 is 0.45mm to 2mm.

[0026] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. Lightweight and anti-attenuation 16-core triple-shielded coaxial cable, characterized by: The invention relates to a cable core comprising 16 coaxial cores (1) arranged in a square and forming a cable core together with a polyester staple fiber buffer core material (2). The coaxial core (1) comprises a central conductor (3), a foamed FEP insulation layer (4), a copper-plastic composite longitudinally wrapped inner shielding layer (5), a tinned copper wire braided intermediate shielding layer (6), a copper-plastic composite wrapped outer shielding layer (7) and a polyurethane coating layer (8). The diameter of the central conductor (3) is 0.1 mm to 0.5 mm, the outer diameter of the foamed FEP insulation layer (4) is 1.6 mm to 2.2 mm, the copper-plastic composite longitudinally wrapped inner shielding layer (5) is The copper-plastic composite tape has a longitudinally overlapped wrapping structure, the copper-plastic composite wrapping outer shielding layer (7) is a copper-plastic composite tape spirally overlapped wrapping structure, the copper-plastic composite tape comprises a polyimide film base layer and a copper foil layer, the polyimide film base layer has a thickness of 10 μm to 150 μm, the copper foil layer has a thickness of 1 μm to 25 μm, the shielding density of the tinned copper wire braided intermediate shielding layer (6) is 40% to 60%, and the outside of the cable core is sequentially coated with a para-type fully aromatic copolyamide stretched fiber braided isolation net (9) and an irradiated cross-linked high-density polyethylene outer sheath layer (10).

2. The lightweight, anti-attenuation 16-core triple-shielded coaxial cable according to claim 1 is characterized by: The central conductor (3) is formed by concentrically twisting a number of tinned copper monofilaments with a wire diameter of 0.02 mm to 0.1 mm.

3. The lightweight, anti-attenuation 16-core triple-shielded coaxial cable according to claim 1 is characterized by: The thickness of the copper foil layer is 3 μm to 10 μm, and the outer surface roughness of the copper foil layer does not exceed 1 μm.

4. The lightweight, anti-attenuation 16-core triple-shielded coaxial cable according to claim 1 is characterized by: The tinned copper wire braided intermediate shielding layer (6) is formed by a plurality of polyester fiber copper foil wires and tinned copper wires being twisted and braided in opposite directions.

5. The lightweight, anti-attenuation 16-core triple-shielded coaxial cable according to claim 4 is characterized by: The diameter of the polyester fiber copper foil wire is different from that of the tinned copper wire, and the diameter ratio is between 0.85 and 1.

6. The lightweight, anti-attenuation 16-core triple-shielded coaxial cable according to claim 1 is characterized by: The thickness of the polyimide film base layer is 20 μm to 60 μm.

7. The lightweight, anti-attenuation 16-core triple-shielded coaxial cable according to claim 1 is characterized by: The para-type fully aromatic copolyamide stretched fiber woven isolation net (9) is composed of inner and outer double layers of para-type fully aromatic copolyamide stretched fiber strands that are mutually reversely spirally wound and woven, and the diameter of the inner layer of para-type fully aromatic copolyamide stretched fiber strands is smaller than the diameter of the outer layer of para-type fully aromatic copolyamide stretched fiber strands.

8. The lightweight, anti-attenuation 16-core triple-shielded coaxial cable according to claim 1 is characterized by: The thickness of the para-type fully aromatic copolyamide stretched fiber woven isolation net (9) is 0.1 mm to 0.3 mm.

9. The lightweight, anti-attenuation 16-core triple-shielded coaxial cable according to claim 1 is characterized by: The inner surface of the radiation cross-linked high-density polyethylene outer sheath layer (10) is provided with a thermoplastic EVA adhesive layer.

10. The lightweight, anti-attenuation 16-core triple-shielded coaxial cable according to claim 1, characterized in that: The thickness of the radiation cross-linked high-density polyethylene outer sheath layer (10) is 0.45 mm to 2 mm.

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