Non-grounding symmetrical armored communication cable

Abstract

The utility model discloses a non-grounded symmetrical armored communication cable, which comprises four inner-layer twisted-pair wire cores and eight outer-layer twisted-pair wire cores, wherein the four inner-layer twisted-pair wire cores and the eight outer-layer twisted-pair wire cores are divided into an inner layer and an outer layer, are sequentially and uniformly distributed at intervals around the outer part of a central galvanized steel wire stranded wire in the circumferential direction, and are jointly twisted with a para-position type wholly aromatic copolyamide stretched fiber core material to form a cable core; the twisted-pair wire core comprises two insulating wire cores and two filling core strips which are uniformly distributed in a cross shape and are twisted together to form a wire core body, and the wire core body is coated with a copper-plastic composite wrapping sub-shielding layer. The outside of the cable core is sequentially coated with a PTFE semi-directional belt wrapping antifriction layer, a copper-plastic composite wrapping total shielding layer, an irradiation crosslinking linear low density polyethylene lining layer, a copper net weaving armor layer and an irradiation crosslinking linear low density polyethylene outer sheath layer, the communication cable is high in mechanical strength and has slight impact resistance, the shielding layer does not need to be grounded, the shielding layer is not required to be grounded, and the service life of the cable is prolonged. Signal crosstalk can be effectively suppressed, stable shielding performance is ensured, and durability is better.

Description

Technical Field

[0001] The present application relates to the field of cable technology, and in particular to a non-grounded symmetrical armored communication cable. Background Art

[0002] In intelligent industrial production lines, symmetrical communication cables are used in signal transmission and control systems in monitoring equipment, electronic computers, and information processing equipment. The electromagnetic noise environment at industrial application sites is often very complex, and the radiation or conduction of electromagnetic noise (EMI) may seriously interfere with the normal operation of the equipment. To combat electromagnetic noise interference on electrical lines, a very important way is to use shielded symmetrical communication cables. However, the currently used symmetrical communication cables mostly use copper-plastic composite wrapped shielding layers, which require grounding treatment. The grounding treatment operation on the industrial production line is complicated and the installation cost is high. If the grounding treatment is not used, the copper foil surface will be charged, which is easy to cause signal crosstalk, poor shielding effect, and affect normal operation. Utility Model Content

[0003] In view of the deficiencies in the prior art, the technical problem to be solved by the present application is to provide a non-grounded symmetrical armored communication cable with high mechanical strength, resistance to slight impact, better flexibility in laying and application, no need for grounding of the shielding layer, and the ability to effectively suppress signal crosstalk, ensure stable shielding performance, and better durability.

[0004] This application solves the above technical problems through the following technical solutions.

[0005] The non-grounded symmetrical armored communication cable comprises four inner twisted pair cores and eight outer twisted pair cores, which are divided into inner and outer layers and are uniformly spaced around the outside of the central galvanized steel wire strands and twisted together with the para-type fully aromatic copolyamide stretched fiber core material to form a cable core. Each two outer twisted pair cores are located between two adjacent inner twisted pair cores. The inner twisted pair cores and the outer twisted pair cores each comprise two insulating cores and two filling core strips, which are uniformly distributed in a cross shape and twisted together to form a wire core body. The outside of the wire core body is coated with a copper-plastic composite wrapping screen. The cable core is coated with a PTFE semi-directional tape wrapped anti-friction layer, a copper-plastic composite wrapped total shielding layer, an irradiated cross-linked linear low-density polyethylene liner, a copper mesh woven armor layer and an irradiated cross-linked linear low-density polyethylene outer sheath layer in sequence. The copper-plastic composite wrapped sub-shielding layer and the copper-plastic composite wrapped total shielding layer are both copper-plastic composite tape spirally overlapped wrapped structures. The copper-plastic composite tape is formed by a PET film surface layer, a copper foil and a PET film bottom layer. The surface of the copper foil is equidistantly spaced along the length direction with a number of gaps with a width of 5μm to 80μm.

[0006] Preferably, the angle between the length direction of the slit and the length direction of the copper foil is 15 degrees to 165 degrees.

[0007] Preferably, the spacing between the gaps is 60 μm to 500 μm.

[0008] Preferably, the overlap rate of the copper-plastic composite tape is 15% to 30%.

[0009] Preferably, the thickness of the PET film surface layer and the PET film bottom layer are both 20 μm to 150 μm, and the thickness of the copper foil is 8 μm to 120 μm.

[0010] Preferably, the insulated core comprises an inner conductor and an XLPE insulation layer.

[0011] Preferably, the inner conductor is composed of a plurality of tinned copper monofilaments with a diameter of 0.05 mm to 0.08 mm twisted together.

[0012] Preferably, the wire core twist direction, the cable core twist direction, the copper-plastic composite wrapping shielding layer winding direction and the copper-plastic composite wrapping shielding layer winding direction are all the same.

[0013] Preferably, the width of the copper-plastic composite belt is 12 mm to 60 mm.

[0014] Preferably, the thickness of the radiation cross-linked linear low-density polyethylene liner layer is 0.45 mm to 1 mm, and the thickness of the radiation cross-linked linear low-density polyethylene outer sheath layer is 0.8 mm to 1.6 mm.

[0015] Beneficial effects of this application:

[0016] 1. By improving the shielding structure of the original sub-shielding layer and the overall shielding layer, removing the grounding wire, in the copper-plastic composite wrapped shielding layer structure, by forming gaps with equal spacing along the length direction and a width of 5μm to 80μm on the surface of the copper foil, the angle between the length direction of the gap and the length direction of the copper foil is optimized to be 15 degrees to 165 degrees, the spacing between the gaps is 60μm to 500μm, and the overlap rate of the copper-plastic composite tape is 15% to 30%. The shielding layer formed by the copper-plastic composite tape wrapping does not need to be grounded, which simplifies the laying and installation process, reduces the installation process cost, can effectively prevent the copper foil surface from being charged, is conducive to suppressing the occurrence of signal crosstalk, ensures stable shielding performance, and has better durability.

[0017] 2. In the copper-plastic composite tape structure, adding PET film on both sides of the copper foil helps to improve the flexibility of the shielding layer, relieve stress concentration, effectively prevent the copper foil from cracking and failure, and improve the durability of the cable and the flexibility of laying and installation.

[0018] 3. By adding a copper mesh braided armor layer between the inner cushion layer and the outer sheath, additional mechanical protection is provided, which has a certain resistance to slight impact, while taking into account the flexibility of the cable, improving the mechanical strength of the cable, protecting the sheath layer, and improving durability and applicability.

[0019] 4. The twist direction of the wire core, the twist direction of the cable core, the twist direction of the copper-plastic composite wrapping sub-shielding layer and the twist direction of the copper-plastic composite wrapping total shielding layer are all the same, which helps to ensure a balanced and stable cable core structure. The sliding property of the PTFE semi-directional tape wrapping anti-friction layer improves the anti-friction effect, helps to reduce the load applied to the inner and outer twisted wire cores inside the cable core, prevents the twisted wire cores from loosening, and ensures stable signal transmission characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The following drawings are intended to facilitate the description of preferred embodiments and are not intended to limit the scope of protection of the present application.

[0021] Figure 1 It is a schematic diagram of the cross-sectional structure of an embodiment of the present application.

[0022] In the figure: 1-inner twisted pair core, 2-outer twisted pair core, 3-center galvanized steel wire strand, 4-para-type fully aromatic copolyamide stretched fiber core material, 5-insulating core, 6-filling core strip, 7-copper-plastic composite wrapping sub-shielding layer, 8-PTFE semi-oriented tape wrapping anti-friction layer, 9-copper-plastic composite wrapping overall shielding layer, 10-irradiated cross-linked linear low-density polyethylene inner lining layer, 11-copper mesh braided armor layer, 12-irradiated cross-linked linear low-density polyethylene outer sheath layer, 13-inner conductor, 14-XLPE insulation layer. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0024] like Figure 1As shown, the non-grounded symmetrical armored communication cable of the embodiment of the present application includes four inner twisted cores 1 and eight outer twisted cores 2, which are divided into inner and outer layers and are uniformly spaced around the outside of the central galvanized steel wire strand 3 and twisted together with the para-type fully aromatic copolyamide stretched fiber core material 4 to form a cable core. Each two outer twisted cores 2 are located between two adjacent inner twisted cores 1. The inner twisted cores 1 and the outer twisted cores 2 each include two insulating cores 5 and two filling core strips 6, which are uniformly distributed in a cross shape and twisted together to form a wire core body. In one embodiment, the insulating core 5 includes an inner conductor 13 and an XLPE insulation layer 14. Specifically, the inner conductor 13 is composed of a plurality of tinned copper monofilaments with a diameter of 0.05 mm to 0.08 mm. The outside of the wire core body is coated with a copper-plastic composite wrapping shielding layer 7.

[0025] The cable core is coated with a PTFE semi-directional tape wrapped anti-friction layer 8, a copper-plastic composite wrapped total shielding layer 9, an irradiated cross-linked linear low-density polyethylene lining layer 10, a copper mesh braided armor layer 11 and an irradiated cross-linked linear low-density polyethylene outer sheath layer 12 in sequence. Furthermore, the core twist direction, the cable core twist direction, the copper-plastic composite wrapped sub-shielding layer 7 winding direction and the copper-plastic composite wrapped total shielding layer 9 winding direction are all the same. The thickness of the irradiated cross-linked linear low-density polyethylene lining layer 10 is 0.45mm to 1mm, and the thickness of the irradiated cross-linked linear low-density polyethylene outer sheath layer 12 is 0.8mm to 1.6mm.

[0026] The copper-plastic composite wrapped shielding layer 7 and the copper-plastic composite wrapped total shielding layer 9 are both copper-plastic composite tape spirally overlapped wrapped structures. Further, the copper-plastic composite tape overlap rate is 15% to 30%. The copper-plastic composite tape has a width of 12mm to 60mm. The copper-plastic composite tape is formed by a composite of a PET film surface layer, a copper foil and a PET film bottom layer. Specifically, the thickness of the PET film surface layer and the PET film bottom layer is 20μm to 150μm, and the thickness of the copper foil is 8μm to 120μm. The copper foil surface is equidistantly spaced along the length direction with a width of 5μm to 80μm, and the spacing between the gaps is 60μm to 500μm. Further, the angle between the length direction of the gap and the length direction of the copper foil is 15 degrees to 165 degrees.

[0027] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. Non-grounded symmetrical armored communication cable, characterized by: The cable comprises four inner twisted wire cores (1) and eight outer twisted wire cores (2), which are divided into inner and outer layers and are uniformly spaced around the outside of a central galvanized steel wire strand (3) and twisted together with a para-type fully aromatic copolyamide stretched fiber core material (4) to form a cable core, wherein each two outer twisted wire cores (2) are located between two adjacent inner twisted wire cores (1), and the inner twisted wire cores (1) and the outer twisted wire cores (2) each comprise two insulating wire cores (5) and two filling core strips (6) which are uniformly spaced in a cross shape and twisted together to form a wire core body, and the outside of the wire core body is coated with a copper-plastic composite wrapped shielding layer (7). The cable core is coated with a PTFE semi-directional tape wrapped anti-friction layer (8), a copper-plastic composite wrapped total shielding layer (9), an irradiated cross-linked linear low-density polyethylene lining layer (10), a copper mesh braided armor layer (11) and an irradiated cross-linked linear low-density polyethylene outer sheath layer (12) in sequence, and the copper-plastic composite wrapped sub-shielding layer (7) and the copper-plastic composite wrapped total shielding layer (9) are both copper-plastic composite tape spirally overlapped wrapped structures, and the copper-plastic composite tape is formed by a PET film surface layer, a copper foil and a PET film bottom layer, and a plurality of gaps with a width of 5 μm to 80 μm are equidistantly spaced along the length direction on the surface of the copper foil.

2. The non-grounded symmetrical armored communication cable according to claim 1 is characterized in that: The angle between the length direction of the slit and the length direction of the copper foil is 15 degrees to 165 degrees.

3. The non-grounded symmetrical armored communication cable according to claim 1 is characterized in that: The spacing between the gaps is 60 μm to 500 μm.

4. The non-grounded symmetrical armored communication cable according to claim 1 is characterized in that: The overlap rate of the copper-plastic composite tape is 15% to 30%.

5. The non-grounded symmetrical armored communication cable according to claim 1 is characterized in that: The thickness of the PET film surface layer and the PET film bottom layer are both 20 μm to 150 μm, and the thickness of the copper foil is 8 μm to 120 μm.

6. The non-grounded symmetrical armored communication cable according to claim 1 is characterized in that: The insulated wire core (5) comprises an inner conductor (13) and an XLPE insulation layer (14).

7. The non-grounded symmetrical armored communication cable according to claim 6 is characterized in that: The inner conductor (13) is composed of a plurality of tinned copper monofilaments having a diameter of 0.05 mm to 0.08 mm twisted together.

8. The non-grounded symmetrical armored communication cable according to claim 1, characterized in that: The wire core twist direction, the cable core twist direction, the copper-plastic composite wrapping sub-shielding layer (7) winding direction and the copper-plastic composite wrapping overall shielding layer (9) winding direction are all the same.

9. The non-grounded symmetrical armored communication cable according to claim 1, characterized in that: The width of the copper-plastic composite belt ranges from 12mm to 60mm.

10. The non-grounded symmetrical armored communication cable according to claim 1, characterized in that: The thickness of the radiation cross-linked linear low-density polyethylene lining layer (10) is 0.45 mm to 1 mm, and the thickness of the radiation cross-linked linear low-density polyethylene outer sheath layer (12) is 0.8 mm to 1.6 mm.

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