Multi-four-wire-group signal cable for self-supporting railway network system

Abstract

The utility model discloses a self-supporting railway network system multi-four-wire-group signal cable, which comprises multi-four-wire-group signal wire cores and bearing stranded wires, wherein the multi-four-wire-group signal wire cores and the bearing stranded wires are arranged at intervals and are jointly coated in an irradiation crosslinking linear low-density polyethylene outer sheath layer; the outer sheath layer forms a connecting rib on a spacing section between the multi-four-wire-group signal wire core and the bearing stranded wire, and the multi-four-wire-group signal wire core comprises four four-wire groups which are circumferentially arranged at intervals through a rhombic TPU elastomer damping filling core and are stranded with an alignment type wholly aromatic copolyamide stretched fiber core material to form a cable core. The cable core is sequentially coated with a PTFE semi-directional belt outer wrapping antifriction layer, an aluminum-plastic composite longitudinal wrapping shielding layer, an irradiation crosslinking linear low density polyethylene lining layer and an AFRP reinforced weaving impact-resistant plain weaving net. The signal cable has self-bearing performance, has good slight impact resistance and vibration reduction performance, and is better in durability.

Description

Technical Field

[0001] The present application relates to the field of cable technology, and in particular to a self-supporting railway network system multi-quad signal cable. Background Art

[0002] Rail transit construction is large-scale, involving multiple industries such as construction, metallurgy, electrical, electromechanical equipment, and wires and cables. Wire and cable manufacturing is one of the largest supporting industries and is closely related to the development of urban rail transit. There are many varieties of wires and cables for urban rail transit. For example, power cables are mainly DC traction cables, flame-retardant cables, fire-resistant cables, green environmental protection cables, etc. Signal cables are mainly subway signal cables, control cables, communication cables, and communication optical cables. In the control circuits of automatic transmission signal devices with rated voltages of AC 500V or DC 1000V and below, it is necessary to adapt to areas with strong electrical interference. Generally, they are laid in soil and pipe grooves, and are required to withstand large mechanical external forces and have good shielding performance. However, such signal cables do not have their own load-bearing performance. When they are laid overhead, the installation and construction are difficult. The vibration and slight impact generated in the complex external environment can easily damage the cables, resulting in unstable electrical characteristics, poor durability, and potential safety hazards. 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 self-supporting railway network system multi-four-wire signal cable with its own load-bearing performance, a round and balanced cable core structure, high mechanical strength, good resistance to slight impact and vibration reduction performance, better durability, and reduced safety hazards.

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

[0005] A self-supporting railway network system multi-quad signal cable comprises a multi-quad signal core and a load-bearing stranded wire arranged at intervals and coated together in an irradiated cross-linked linear low-density polyethylene outer sheath layer, wherein the irradiated cross-linked linear low-density polyethylene outer sheath layer is provided with connecting ribs on the interval section between the multi-quad signal core and the load-bearing stranded wire, wherein the multi-quad signal core comprises four quads which are circumferentially separated and arranged by a rhombus-shaped TPU elastomer vibration-damping filling core and are twisted together with a para-type fully aromatic copolyamide stretched fiber core material to form a cable core, wherein the rhombus-shaped TPU elastomer vibration-damping filling core is provided with a connecting rib ... rhombus-shaped TPU elastomer vibration-damping filling core is provided with a connecting rib on the interval section between the multi-quad signal core and the load-bearing stranded wire, wherein the connecting ribs are provided with a connecting rib on the interval section between the multi-quad signal core and the load-bearing stranded wire, wherein the connecting ribs are provided with a connecting rib on the interval section between the multi-quad signal core and the load-bearing stranded wire, wherein the connecting ribs are provided with a connecting rib on the interval section between the multi-quad signal core and the load-bearing stranded wire, wherein the connecting ribs are provided with a connecting rib on the A central hole is provided in the central part of the PU elastomer vibration-damping filling core, a nylon rope is sleeved in the central hole, four vibration-damping longitudinal holes are evenly distributed around the central hole at the four corners of the diamond-shaped TPU elastomer vibration-damping filling core, the four-wire group includes four insulated wires twisted together to form a wire core body, the outside of the wire core body is coated with a PTFE semi-directional tape inner wrapped friction-reducing layer, the outside of the cable core is coated with a PTFE semi-directional tape outer wrapped friction-reducing layer, an aluminum-plastic composite longitudinal wrapped shielding layer, a radiation cross-linked linear low-density polyethylene inner lining layer and an AFRP reinforced woven impact-resistant plain weave mesh in sequence.

[0006] Preferably, the insulated wire comprises a solid annealed copper conductor and a polyethylene extruded inner insulation layer, a foamed polyethylene insulation layer and a polyethylene extruded outer insulation layer which are sequentially coated on the outside of the solid annealed copper conductor.

[0007] Preferably, the solid annealed copper conductor has a diameter of 0.9 mm or 1.4 mm.

[0008] Preferably, the lay direction of the wire core is the same as that of the cable core.

[0009] Preferably, the thickness of the radiation cross-linked linear low-density polyethylene liner is 0.45 mm to 1.3 mm.

[0010] Preferably, the cable core lay length is 10 to 20 times the outer diameter of the quad.

[0011] Preferably, the aluminum-plastic composite longitudinally wrapped shielding layer is a longitudinally overlapped wrapped structure of an aluminum-plastic composite tape, wherein the aluminum-plastic composite tape is formed by a composite of a PET film surface layer, an aluminum foil layer and a PET film bottom layer.

[0012] Preferably, the thickness of the PET film surface layer and the PET film bottom layer are both 50 μm to 120 μm, and the thickness of the aluminum foil layer is 20 μm to 100 μm.

[0013] Preferably, the lay lengths of the four quads are different.

[0014] 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, wherein the diameter of the coarse aramid strands is 2 to 8 times the diameter of the fine aramid strands, and the aramid strands are a plurality of aramid fibers twisted together and hot-melt bonded with thermoplastic polypropylene resin.

[0015] Beneficial effects of this application:

[0016] 1. By adding load-bearing stranded wire and nylon rope, it has high tensile strength load-bearing performance, can be flexibly applied to various overhead installation environments, reduces the difficulty of installation and construction, and has better durability.

[0017] 2. The four-wire group is spaced by a diamond-shaped TPU elastomer vibration-damping filling core, which helps to keep the cable core structure round and balanced and enhance the mechanical strength. There are four vibration-damping longitudinal holes on the four corners of the diamond-shaped TPU elastomer vibration-damping filling core, which helps to reduce vibration. Under slight impact and vibration conditions, it can reduce the oscillation load borne by each four-wire group and prevent wire breakage. The sliding property of the inner and outer wrapped friction-reducing layers of the PTFE semi-directional tape improves the friction-reducing effect, which helps to reduce the load applied to the four-wire group. An AFRP reinforced braided impact-resistant plain weave is added between the irradiated cross-linked linear low-density polyethylene liner and the outer sheath layer, which takes into account flexibility while improving the resistance to slight impact, increases the mechanical strength of the outer sheath layer, effectively protects the cable sheath, reduces safety hazards, ensures stable electrical properties, and improves durability.

[0018] 3. By improving the structure of the aluminum-plastic composite longitudinal shielding layer, the aluminum-plastic composite tape is formed by a composite of a PET film surface layer, an aluminum foil layer and a PET film bottom layer. The grounding wire is removed, and PET films are added on both sides of the aluminum foil to improve the flexibility of the shielding layer and relieve stress concentration. No grounding treatment is required to ensure stable shielding performance, which is conducive to reducing complex operating costs and process difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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.

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

[0021] In the figure: 1-multi-quad signal wire core, 2-load-bearing stranded wire, 3-irradiated cross-linked linear low-density polyethylene outer sheath layer, 4-connecting ribs, 5-quad, 6-diamond TPU elastomer vibration-damping filling core, 7-para-type fully aromatic copolyamide stretched fiber core material, 8-insulated wire, 9-PTFE semi-directional tape inner wrapped friction-reducing layer, 10-center hole, 11-nylon rope, 12-vibration-damping longitudinal hole, 13-PTFE semi-directional tape outer wrapped friction-reducing layer, 14-aluminum-plastic composite longitudinal wrapped shielding layer, 15-irradiated cross-linked linear low-density polyethylene inner lining layer, 16-AFRP reinforced braided impact-resistant plain weave, 17-solid annealed copper conductor, 18-polyethylene extruded inner insulation layer, 19-foamed polyethylene insulation layer, 20-polyethylene extruded outer insulation layer. DETAILED DESCRIPTION

[0022] 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.

[0023] like Figure 1 As shown, the self-supporting railway network system multi-quad signal cable of an embodiment of the present application includes a multi-quad signal core 1 and a load-bearing stranded wire 2 arranged at intervals and jointly coated in a radiation cross-linked linear low-density polyethylene outer sheath layer 3, wherein the radiation cross-linked linear low-density polyethylene outer sheath layer 3 is provided with connecting ribs 4 on the interval section between the multi-quad signal core 1 and the load-bearing stranded wire 2.

[0024] The multi-quad signal core 1 includes four quads 5 which are circumferentially separated by a rhombus TPU elastomer vibration-damping filling core 6 and twisted together with a para-type fully aromatic copolyamide stretched fiber core material 7 to form a cable core. Furthermore, the four quads 5 have different lay lengths, and the cable core lay length is 10 to 20 times the outer diameter of the quad 5. A center hole 10 is provided in the center of the rhombus TPU elastomer vibration-damping filling core 6, and a nylon rope 11 is sleeved in the center hole 10. Four vibration-damping longitudinal holes 12 are evenly distributed around the center hole 10 at the four corners of the rhombus TPU elastomer vibration-damping filling core 6. The quad 5 includes four insulated wires 8 twisted together to form a wire core body. Furthermore, the lay direction of the wire core body is the same as the lay direction of the cable core. In one embodiment, the insulated wire 8 comprises a solid annealed copper conductor 17 and a polyethylene extruded inner insulation layer 18, a foamed polyethylene insulation layer 19 and a polyethylene extruded outer insulation layer 20 sequentially coated on the outside of the solid annealed copper conductor 17. Specifically, the diameter of the solid annealed copper conductor 17 is 0.9 mm or 1.4 mm. The outside of the wire core is coated with a PTFE semi-oriented tape inner wrapping anti-friction layer 9.

[0025] The cable core is coated with a PTFE semi-directional tape outer wrapping anti-friction layer 13, an aluminum-plastic composite longitudinal wrapping shielding layer 14, an irradiated cross-linked linear low-density polyethylene liner 15, and an AFRP reinforced braided impact-resistant flat weave 16 in sequence. The thickness of the irradiated cross-linked linear low-density polyethylene liner 15 is 0.45 mm to 1.3 mm. In one embodiment, the aluminum-plastic composite longitudinal wrapping shielding layer 14 is a longitudinally overlapped wrapping structure of an aluminum-plastic composite tape, and the aluminum-plastic composite tape is formed by a PET film surface layer, an aluminum foil layer, and a PET film bottom layer. Further, the thickness of the PET film surface layer and the PET film bottom layer are both 50 μm to 120 μm, and the thickness of the aluminum foil layer is 20 μm to 100 μm. In one embodiment, the AFRP reinforced braided impact-resistant plain mesh 16 includes an inner and outer double-layer aramid strand plain mesh, wherein the inner layer aramid strand plain mesh is a plain mesh structure woven from fine aramid strands, and the outer layer aramid strand plain mesh is a plain mesh structure woven from coarse aramid strands, wherein the diameter of the coarse aramid strands is 2 to 8 times the diameter of the fine aramid strands, and the aramid strands are a plurality of aramid fibers twisted and hot-melt bonded together with thermoplastic polypropylene resin.

[0026] 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. Self-supporting railway network system multi-quad signal cable, characterized by: The invention relates to a cable core comprising a multi-quad signal wire core (1) and a load-bearing strand (2) arranged at intervals and jointly coated in an irradiated cross-linked linear low-density polyethylene outer sheath layer (3); the irradiated cross-linked linear low-density polyethylene outer sheath layer (3) is provided with a connecting rib (4) at the interval section between the multi-quad signal wire core (1) and the load-bearing strand (2); the multi-quad signal wire core (1) comprises four quads (5) arranged circumferentially spaced apart by a rhombus-shaped TPU elastomer vibration-damping filling core (6) and jointly twisted with a para-type fully aromatic copolyamide stretched fiber core material (7) to form a cable core; the central portion of the rhombus-shaped TPU elastomer vibration-damping filling core (6) is open. A central hole (10) is provided, wherein a nylon rope (11) is sleeved inside the central hole (10), and four vibration-damping longitudinal holes (12) are evenly distributed around the central hole (10) at the four corners of the diamond-shaped TPU elastomer vibration-damping filling core (6). The four-wire group (5) comprises four insulated wires (8) twisted together to form a wire core body, and the outer part of the wire core body is coated with a PTFE semi-directional tape inner wrapped anti-friction layer (9), and the outer part of the cable core is coated with a PTFE semi-directional tape outer wrapped anti-friction layer (13), an aluminum-plastic composite longitudinal wrapped shielding layer (14), an irradiated cross-linked linear low-density polyethylene inner lining layer (15), and an AFRP reinforced braided anti-impact plain woven mesh (16).

2. The self-supporting railway network system multi-quad signal cable according to claim 1, characterized in that: The insulated wire (8) comprises a solid annealed copper conductor (17) and a polyethylene extruded inner insulation layer (18), a foamed polyethylene insulation layer (19) and a polyethylene extruded outer insulation layer (20) which are sequentially coated on the outside of the solid annealed copper conductor (17).

3. The self-supporting railway network system multi-quad signal cable according to claim 2, characterized in that: The solid annealed copper conductor (17) has a diameter of 0.9 mm or 1.4 mm.

4. The self-supporting railway network system multi-quad signal cable according to claim 1, characterized in that: The lay direction of the wire core is the same as that of the cable core.

5. The self-supporting railway network system multi-quad signal cable according to claim 1, characterized in that: The thickness of the radiation cross-linked linear low-density polyethylene liner (15) is 0.45 mm to 1.3 mm.

6. The self-supporting railway network system multi-quad signal cable according to claim 1, characterized in that: The cable core lay length is 10 to 20 times the outer diameter of the quad wire group (5).

7. The self-supporting railway network system multi-quad signal cable according to claim 1, characterized in that: The aluminum-plastic composite longitudinally wrapped shielding layer (14) is a longitudinally overlapped and wrapped structure of an aluminum-plastic composite tape, wherein the aluminum-plastic composite tape is formed by a composite of a PET film surface layer, an aluminum foil layer and a PET film bottom layer.

8. The self-supporting railway network system multi-quad signal cable according to claim 7, characterized in that: The thickness of the film surface layer and the PET film bottom layer are both 50 μm to 120 μm, and the thickness of the aluminum foil layer is 20 μm to 100 μm.

9. The self-supporting railway network system multi-quad signal cable according to claim 1, characterized in that: The lay lengths of the four quads (5) are different.

10. The self-supporting railway network system multi-quad signal cable according to claim 1, characterized in that: The AFRP reinforced braided impact-resistant plain mesh (16) 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, and the aramid strands are a plurality of aramid fibers twisted and hot-melt bonded with thermoplastic polypropylene resin into one.

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