Self-supporting shock-resistant vibration-damping leaky coaxial cable

Abstract

The utility model discloses a self-supporting shock-resistant vibration-damping leaky coaxial cable, which comprises a leaky coaxial cable core and a bearing stranded wire which are arranged at an interval and are jointly wrapped in a butyronitrile polyvinyl chloride outer sheath layer, and the butyronitrile polyvinyl chloride outer sheath layer is provided with a connecting rib on an interval section between the leaky coaxial cable core and the bearing stranded wire. The leakage coaxial cable core comprises a copper pipe conductor, and the copper pipe conductor is sequentially coated with a TPU elastomer hollow vibration reduction core pipe, an irradiation crosslinking linear low-density polyethylene insulating layer, a PTFE semi-directional belt wrapping antifriction layer, an embossing copper belt longitudinal wrapping shielding layer, a fluororubber wrapping damp-proof layer, a butyronitrile polyvinyl chloride inner sheath layer and an AFRP reinforced weaving impact-resistant plain woven net. Leakage slotted holes are formed in the embossing copper strip longitudinal wrapping shielding layer in the axial direction. The leaky coaxial cable has the self-bearing performance, the overall mechanical strength of the cable is high, the anti-impact characteristic is better, vibration can be relieved, the stable electrical characteristic is guaranteed, and the durable usability is better.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a self-supporting anti-impact and vibration-reducing leaky coaxial cable. Background Art

[0002] Leaky coaxial cable is also called leaky coaxial cable, usually referred to as leaky cable or leaky cable. Leaky coaxial cable is widely used in environments with poor wireless signal coverage such as railways, tunnels, mines, buildings, etc. It has both the transmission characteristics of transmission lines and the radiation characteristics of antennas, which can overcome the problem of strong electromagnetic interference underground, thereby improving the quality of communication. The current leaky coaxial cable is usually composed of an inner conductor, a foamed insulation layer, an outer conductor, a wrapping tape, and a sheath. Due to its own structural limitations, it has low mechanical strength and does not have its own load-bearing performance. It is difficult to install and construct. Under complex external working conditions, it is subjected to vibration and slight impact. The vibration reduction performance is insufficient, resulting in unstable electrical characteristics and poor durability. Summary of the invention

[0003] The utility model aims to solve the technical problem of providing a self-supporting anti-impact and vibration-damping leaky coaxial cable with its own load-bearing performance, high overall mechanical strength of the cable, better anti-impact characteristics, the ability to reduce vibration, ensure stable electrical characteristics, and better durability.

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

[0005] A self-supporting anti-impact and vibration-damping leaky coaxial cable comprises a leaky coaxial core and a load-bearing stranded wire arranged at intervals and coated together in a nitrile polyvinyl chloride outer sheath layer, wherein the nitrile polyvinyl chloride outer sheath layer is provided with connecting ribs on the interval section between the leaky coaxial core and the load-bearing stranded wire, and the leaky coaxial core comprises a copper tube conductor, and the copper tube conductor is coated with a TPU elastomer hollow vibration-damping core tube, an irradiated cross-linked linear low-density polyethylene insulation layer, a PTFE semi-directional tape wrapped friction-reducing layer, an embossed copper tape longitudinally wrapped shielding layer, a fluororubber wrapped moisture-proof layer, a nitrile polyvinyl chloride inner sheath layer and an AFRP reinforced braided anti-impact plain mesh, and leakage slots are provided in the axial direction on the embossed copper tape longitudinally wrapped shielding layer.

[0006] Preferably, the TPU elastomer hollow vibration-damping core tube comprises an inner cylindrical body and an outer cylindrical body, and a plurality of connecting plates are evenly distributed radially between the inner cylindrical body and the outer cylindrical body.

[0007] Preferably, the copper tube conductor is a spiral corrugated copper tube.

[0008] Preferably, the load-bearing stranded wire is formed by twisting nylon strands and stainless steel wires, and the wire diameter of the nylon strands does not exceed 70% of the wire diameter of the stainless steel wire.

[0009] Preferably, the stainless steel wire has a diameter of 0.1 mm to 0.3 mm.

[0010] Preferably, the fluororubber wrapped moisture-proof layer is a fluororubber tape multi-layer overlapping wrapped structure with an overlapping rate of 20% to 30%.

[0011] Preferably, the AFRP reinforced braided impact-resistant plain mesh comprises an inner and outer double-layer aramid strand plain mesh, wherein the inner layer aramid strand plain mesh is a plain mesh structure formed by weaving fine aramid strands, and the outer layer aramid strand plain mesh is a plain mesh structure formed by weaving coarse aramid strands, and the diameter of the coarse aramid strands is 2 to 8 times the diameter of the fine aramid strands.

[0012] Preferably, the aramid strand is a plurality of aramid fibers twisted together and hot-melt-bonded with thermoplastic polypropylene resin.

[0013] Preferably, the PTFE semi-directional tape wrapped anti-friction layer is a multi-layer PTFE semi-directional tape overlapping wrapped structure, and the winding distance is one quarter to one half of the tape width.

[0014] Preferably, a thermoplastic EVA adhesive layer is provided on the outer surface of the nitrile polyvinyl chloride inner sheath layer.

[0015] The beneficial effects of the utility model are as follows:

[0016] 1. By adding nylon strands and stainless steel wires to form a load-bearing stranded wire, it has high tensile strength and can be flexibly applied to various laying and installation environments, reducing the difficulty of installation and construction, improving the safety and reliability of the cable, extending its service life, and making it durable.

[0017] 2. The inner and outer sheath layers of nitrile polyvinyl chloride have high tensile strength, tear resistance, wear resistance and excellent weather resistance. In addition, an AFRP reinforced woven impact-resistant plain mesh is added between the inner and outer sheath layers of nitrile polyvinyl chloride, which takes into account flexibility while improving impact resistance, increases the mechanical strength of the inner and outer sheath layers, and effectively protects the cable sheath, prolongs its service life and allows for durable use.

[0018] 3. By arranging a TPU elastomer hollow vibration-damping core tube between the copper tube conductor and the irradiated cross-linked linear low-density polyethylene insulating inner sheath, the TPU elastomer hollow vibration-damping core tube is subjected to external forces in a low-temperature environment and still has good physical and mechanical properties, good flexibility, high elasticity, and high mechanical strength, which helps to reduce vibration. The sliding property of the PTFE semi-directional tape wrapped friction-reducing layer improves the friction-reducing effect, helps to reduce the load applied to the insulation layer, prevents direct contact and friction between the insulation layer and the shielding layer, can withstand slight vibrations, ensure stable electrical characteristics, and improve durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a schematic cross-sectional structure diagram of an embodiment of the utility model.

[0021] In the figure: 1-leaky coaxial core, 2-load-bearing stranded wire, 3-nitrile polyvinyl chloride outer sheath layer, 4-connecting ribs, 5-copper tube conductor, 6-TPU elastomer hollow vibration-damping core tube, 7-irradiation cross-linked linear low-density polyethylene insulation layer, 8-PTFE semi-directional tape wrapped friction-reducing layer, 9-embossed copper tape longitudinally wrapped shielding layer, 10-fluororubber wrapped moisture-proof layer, 11-nitrile polyvinyl chloride inner sheath layer, 12-AFRP reinforced woven impact-resistant plain weave. DETAILED DESCRIPTION

[0022] In order to more clearly illustrate the utility model, the utility model is further described below in conjunction with preferred embodiments and drawings. Similar components in the drawings are represented by the same reference numerals. Those skilled in the art should understand that the content described below is illustrative rather than restrictive, and should not be used to limit the scope of protection of the utility model.

[0023] See also Figure 1 The self-supporting anti-impact and vibration-damping leaky coaxial cable of the embodiment of the utility model comprises a leaky coaxial core 1 and a load-bearing strand 2 arranged at intervals and coated together in a nitrile polyvinyl chloride outer sheath layer 3. Specifically, the load-bearing strand 2 is formed by twisting nylon strands and stainless steel wires, and the wire diameter of the nylon strands does not exceed 70% of the wire diameter of the stainless steel wire. Further, the wire diameter of the stainless steel wire is 0.1 mm to 0.3 mm. The nitrile polyvinyl chloride outer sheath layer 3 is formed with a connecting rib 4 on the interval section between the leaky coaxial core 1 and the load-bearing strand 2.

[0024] The leakage coaxial core 1 includes a copper tube conductor 5, specifically, the copper tube conductor 5 is a spiral corrugated copper tube. The copper tube conductor 5 is coated with a TPU elastomer hollow vibration damping core tube 6, an irradiated cross-linked linear low-density polyethylene insulation layer 7, a PTFE semi-oriented tape wrapped friction reduction layer 8, an embossed copper tape longitudinally wrapped shielding layer 9, a fluororubber wrapped moisture-proof layer 10, a nitrile polyvinyl chloride inner sheath layer 11 and an AFRP reinforced braided impact-resistant plain woven mesh 12 in sequence. Furthermore, the outer surface of the nitrile polyvinyl chloride inner sheath layer 11 is provided with a thermoplastic EVA adhesive layer. The embossed copper tape longitudinally wrapped shielding layer 9 is provided with leakage slots along the axial direction. Specifically, the TPU elastomer hollow vibration damping core tube 6 includes an inner cylinder and an outer cylinder, and a plurality of connecting plates are evenly distributed radially between the inner cylinder and the outer cylinder. In one embodiment, the fluororubber wrapped moisture-proof layer 10 is a fluororubber tape multi-layer overlapping wrapped structure with an overlapping rate of 20% to 30%. In one embodiment, the AFRP reinforced braided impact-resistant flat mesh 12 includes an inner and outer double-layer aramid strand flat mesh, wherein the inner layer aramid strand flat mesh is a flat mesh structure formed by weaving fine aramid strands, and the outer layer aramid strand flat mesh is a flat mesh structure formed by weaving coarse aramid strands, wherein the diameter of the coarse aramid strands is 2 to 8 times the diameter of the fine aramid strands, and further, the aramid strands are a plurality of aramid fibers twisted and hot-melt bonded with thermoplastic polypropylene resin. In one embodiment, the PTFE semi-directional tape wrapping anti-friction layer 8 is a multi-layer PTFE semi-directional tape wrapping structure and the winding pitch is one-quarter to one-half of the bandwidth.

[0025] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the scope of protection of the present invention.

Claims

1. Self-supporting anti-shock and vibration-reducing leaky coaxial cable, characterized by: The invention comprises a leaky coaxial core (1) and a load-bearing stranded wire (2) arranged at intervals and jointly coated in a nitrile polyvinyl chloride outer sheath layer (3); the nitrile polyvinyl chloride outer sheath layer (3) is provided with a connecting rib (4) on the interval section between the leaky coaxial core (1) and the load-bearing stranded wire (2); the leaky coaxial core (1) comprises a copper tube conductor (5); the copper tube conductor (5) is coated with a TPU elastomer hollow vibration-damping core tube (6), an irradiated cross-linked linear low-density polyethylene insulation layer (7), a PTFE semi-directional tape wrapped friction-reducing layer (8), an embossed copper tape longitudinally wrapped shielding layer (9), a fluororubber wrapped moisture-proof layer (10), a nitrile polyvinyl chloride inner sheath layer (11) and an AFRP reinforced braided impact-resistant plain woven mesh (12); and the embossed copper tape longitudinally wrapped shielding layer (9) is provided with leakage slots along the axial direction.

2. The self-supporting anti-shock and vibration-damping leaky coaxial cable according to claim 1 is characterized in that: The TPU elastomer hollow vibration-damping core tube (6) comprises an inner cylindrical body and an outer cylindrical body, and a plurality of connecting plates are evenly distributed radially between the inner cylindrical body and the outer cylindrical body.

3. The self-supporting anti-shock and vibration-damping leaky coaxial cable according to claim 1 is characterized in that: The copper tube conductor (5) is a spiral corrugated copper tube.

4. The self-supporting anti-shock and vibration-damping leaky coaxial cable according to claim 1 is characterized in that: The fluororubber wrapped moisture-proof layer (10) is a fluororubber belt multi-layer overlapping wrapped structure with an overlapping rate of 20% to 30%.

5. The self-supporting anti-shock and vibration-damping leaky coaxial cable according to claim 1 is characterized in that: The AFRP reinforced braided impact-resistant plain mesh (12) comprises an inner and outer double-layer aramid strand plain mesh, wherein the inner layer aramid strand plain mesh is a plain mesh structure formed by weaving fine aramid strands, and the outer layer aramid strand plain mesh is a plain mesh structure formed by weaving coarse aramid strands, wherein the diameter of the coarse aramid strands is 2 to 8 times the diameter of the fine aramid strands.

6. The self-supporting anti-shock and vibration-damping leaky coaxial cable according to claim 5 is characterized in that: The aramid strand is a plurality of aramid fibers twisted together and hot-melt-bonded with thermoplastic polypropylene resin.

7. The self-supporting anti-shock and vibration-damping leaky coaxial cable according to claim 1 is characterized by: The PTFE semi-directional tape wrapped anti-friction layer (8) is a multi-layer PTFE semi-directional tape overlapping and wrapped structure, and the winding distance is one quarter to one half of the tape width.

8. The self-supporting anti-shock and vibration-damping leaky coaxial cable according to claim 1 is characterized by: The outer surface of the nitrile polyvinyl chloride inner sheath layer (11) is provided with a thermoplastic EVA adhesive layer.

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