Rail transit cable

Abstract

The utility model discloses a rail transit cable which comprises a first cable core, a second cable core, a third cable core and a sheath wrapping the cable cores, a plurality of cable cores are arranged in the cable side by side, and the cross section of the cable is in a transverse strip shape; the cable core comprises a conductor and an insulator. The cable is reasonable in structural design, and has the following beneficial effects: 1, by adopting the flexible conductor twisting structure, the flexibility of the conductors is improved, and the phenomena of fracture, construction difficulty and the like are reduced; the structure is stable, extrusion deformation is not likely to happen, and signal transmission is safer and more stable; and by arranging the insulating layer, the electric strength and the service life of the cable are effectively improved. 2, the structure of the cable is arranged to be in a transverse strip shape, the mechanical strength and durability are maintained while thinner conductors are used, and the weight and the size of a wire harness system are reduced; meanwhile, the surface area is large, heat dissipation is effectively promoted, and higher current can be borne; and the arrangement is convenient for automatic application.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a rail transit cable. Background Art

[0002] With the development of the national economy, the construction of intercity rail transit systems has expanded rapidly. Due to the particularity of the subway system, the safety performance requirements of wires and cables used in this field are higher than those in general fields. At present, most cables used in intercity rail transit systems have poor moisture resistance, external impact resistance, signal interference resistance, fire resistance and safety performance, and poor flexibility, which often cause low cable safety performance and transmission signal distortion. Cables break after repeated bending and construction difficulties, which in turn affect the service life of the cables and increase maintenance costs.

[0003] Therefore, there is an urgent need to improve the moisture resistance, external impact resistance, signal interference resistance, fire safety performance and flexibility of intercity rail transit cables in order to improve the stability of intercity rail transit and reduce maintenance costs. Utility Model Content

[0004] The utility model aims to provide a rail transit cable, which solves the technical problems in the current prior art of low safety performance of traditional cables, distortion of transmission signals, breakage of cables after repeated bending and construction difficulties.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the utility model provides a rail transit cable, comprising a plurality of cable cores and sheaths wrapping the cable cores, wherein the plurality of cable cores are arranged side by side in the cable, and the cross-section of the cable is a transverse strip; the cable cores comprise a first cable core, a second cable core, and a third cable core; the first cable core comprises a main conductor and a main insulation; the second cable core comprises a first core and a plurality of second cores surrounding the first core; the third cable core comprises a plurality of third cores and a plurality of fourth cores; the second core comprises a first control core conductor and a first control core insulation wrapped in the outer layer of the first control core conductor; the fourth core comprises a second control core conductor and a second control core insulation wrapped in the outer layer of the second control core conductor.

[0006] Further, a plurality of the third cores are wound in a loop, and a plurality of the fourth cores are wound around the wound third cores.

[0007] Furthermore, the first core includes a control main conductor and a control main insulation wrapped around the outer layer of the control main conductor; the third core includes a control main core conductor and a control main core insulation wrapped around the outer layer of the control main core conductor.

[0008] Furthermore, the cable also includes steel wires, and the steel wires are arranged at both transverse ends of the cable.

[0009] Furthermore, the number of the first cable cores is 6, the number of the second cable core and the third cable core is 1, and the structure of the cable from left to right is steel wire, first cable core, first cable core, first cable core, first cable core, second cable core, first cable core, third cable core, first cable core, steel wire.

[0010] Furthermore, the main conductor is a conductor twisted from a Category 5 tinned copper wire bundle, the control main conductor is a conductor twisted from a Category 5 copper foil wire bundle, the control main core conductor, the first control core conductor, and the second control core conductor are conductors twisted from a Category 6 copper foil wire bundle; the main insulation, control main insulation, control main core insulation, first control core insulation, and second control core insulation are flame-retardant and cold-resistant nitrile polyvinyl chloride insulation layers.

[0011] Furthermore, the main conductor is a conductor formed by twisting 330 tinned wire bundles with a diameter of 0.52 mm, with a twisting pitch of 112 to 149 mm; the control main conductor is a conductor formed by twisting 166 copper foil wire bundles with a diameter of 0.52 mm, with a twisting pitch of 80 to 104 mm; the control main core conductor is formed by twisting 113 copper foil wire bundles with a diameter of 0.26 mm, with a twisting pitch of 32 to 42 mm; the first control core conductor and the second control core conductor are formed by twisting 28 copper foil wire bundles with a diameter of 0.26 mm, with a twisting pitch of 18 to 23 mm.

[0012] Furthermore, the nominal thickness of the insulation layer of the main insulation is 2.2 mm; the nominal thickness of the insulation layer of the control main insulation is 1.2 mm; the nominal thickness of the insulation layer of the control main core insulation, the first control core insulation, and the second control core insulation is 0.8 mm; the average thickness of the insulation layer is not less than the nominal thickness, and the thinnest point is not less than 90% of the nominal value.

[0013] Furthermore, a gap is provided between the wire cores, and the gap is not less than 2 mm.

[0014] Furthermore, the steel wire is a manganese phosphating coated steel wire rope, and the sheath is a flame retardant polyurethane PUR sheath; the gap between the cores is not less than 3 mm.

[0015] Manganese phosphate coated steel wire rope has the longest service life and is the most advanced technology in the world's steel wire rope manufacturing industry. Manganese phosphate coating can greatly improve the wear resistance and corrosion resistance of the rope wire surface. Fatigue test data proves that the fatigue life of manganese phosphate coated steel wire rope is 3-5 times that of smooth steel wire rope. With the research on wear-resistant phosphating liquid, there is a possibility of further improving fatigue life. According to the current market price of manganese phosphate coated steel wire rope, the average daily cost of manganese phosphate coated steel wire rope is only about one-third of that of smooth steel wire rope.

[0016] In summary, the device structure of the utility model is reasonably designed, and the use of the technical solution of the utility model has the following beneficial effects: the utility model greatly improves the softness of the conductor by adopting a soft conductor twisted structure, avoiding the occurrence of conductor breakage and construction difficulties after repeated bending; the structure is stable and not easily squeezed and deformed, ensuring that the signal transmission is safer and more stable; by adopting an insulating layer, the electrical strength and service life of the cable are effectively improved. The cross-section of the cable of the utility model is set as a transverse strip, which can use thinner conductors while maintaining mechanical strength and durability, and can reduce the weight of the overall wiring harness system by up to 40% and the volume by up to 35%; at the same time, it has a larger surface area under equal volume conditions, effectively promoting heat dissipation, so that the conductor of the same volume can carry a higher current; and this setting is suitable for the application of planar structures, and its high flexibility makes it adaptable to sports or small bending radius environments, and the power line and signal line can be integrated into a single flat cable, which is convenient for automation applications due to its stable fixed geometric shape and solid structural design. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the cross-sectional structure of the rail transit cable of the utility model;

[0018] Explanation of the accompanying drawings: 1. main conductor 2. main insulation 3. control main conductor 4. control main insulation 5. first control core conductor 6. first control core insulation 7. control main core conductor 8. control main core insulation 9. second control core conductor 10. second control core insulation 11. steel wire 12. sheath. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention, but this does not constitute a limitation on the protection scope of the present invention.

[0020] In the present invention, for a clearer description, the following explanation is made: the observer faces the attached Figure 1For observation, the left front side of the observer is set as the front, the right rear side of the observer is set as the rear, the left rear side of the observer is set as the left, the right front side of the observer is set as the right, the top of the observer is set as the top, and the bottom of the observer is set as the bottom. It should be pointed out that the terms "front end", "rear end", "left side", "right side", "middle", "top", "bottom" and the like in the text indicate the orientation or position relationship based on the orientation or position relationship set in the drawings, which is only for the convenience of clearly describing the utility model, and does not indicate or imply that the structure or component referred to must have a specific orientation or be constructed in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third", and "fourth" are only used for the purpose of clarifying or simplifying the description, and cannot be understood as indicating or implying relative importance or quantity.

[0021] See also Figure 1 The technical solution of the utility model provides a rail transit cable, including a plurality of cable cores and a sheath 12 wrapping the cable cores, the plurality of cable cores are arranged side by side in the cable, and the cross-section of the cable is a transverse strip; the cable cores include a first cable core, a second cable core, and a third cable core; the first cable core includes a main conductor 1 and a main insulation 2; the second cable core includes a first core and a plurality of second cores surrounding the first core; the third cable core includes a plurality of third cores and a plurality of fourth cores; the second core includes a first control core conductor 5 and a first control core insulation wrapped around the outer layer of the first control core conductor 5; the fourth core includes a second control core conductor 9 and a second control core insulation wrapped around the outer layer of the second control core conductor 9.

[0022] The cross section of the cable of the utility model is set to be a transverse strip, and the beneficial effects are as follows:

[0023] 1. It has significant advantages in space utilization. The internal space of rail transit vehicles is limited, and the thin design of flat cables can better adapt to the narrow installation space, does not take up too much space, and is convenient for wiring in the complex structure of the vehicle.

[0024] 2. It can have good anti-bending and anti-twisting performance. During rail transit operation, vehicles will experience frequent vibrations and line bending. Flat cables can withstand these dynamic stresses and are not prone to breakage or damage, thus ensuring the stability of power and signal transmission.

[0025] 3. Good electromagnetic compatibility. It can effectively reduce the impact of electromagnetic interference on signal transmission, ensure the normal operation of key systems such as the train control system and communication system, and improve the safety and reliability of rail transit operation.

[0026] 4. Flat cables usually have a higher level of protection. They can resist the erosion of harsh environmental conditions such as dust, moisture, oil, etc., and adapt to the changing external environment in rail transit.

[0027] 5. Relatively convenient for installation and maintenance. Its neat appearance makes the installation process simpler and more efficient, and also facilitates detection and repair when a fault occurs, reducing maintenance costs and time.

[0028] At the same time, the utility model adopts a soft conductor twisted structure, which greatly improves the flexibility of the conductor, avoids the occurrence of conductor breakage and construction difficulties after repeated bending; the structure is stable and not easily squeezed and deformed, ensuring that signal transmission is safer and more stable; the use of an insulating layer effectively improves the electrical strength and service life of the cable; the utility model has a reasonable structural design, is light in weight, simple in structure, easy to manufacture, and low in price.

[0029] Specifically, a plurality of third cores are wound in a loop, and a plurality of fourth cores are wound around the wound third cores.

[0030] Specifically, the first core includes a control main conductor 3 and a control main insulation 4 wrapped around the control main conductor 3 ; the third core includes a control main core conductor 7 and a control main core insulation 8 wrapped around the control main core conductor 7 .

[0031] As a preferred embodiment of the present invention, the cable further comprises a steel wire 11. The steel wires 11 are arranged at both transverse ends of the cable, and the steel wires 11 are manganese-based phosphating coated steel wire ropes.

[0032] Steel wire 11 uses manganese phosphate coated steel wire rope, which is the most advanced technology in the world's steel wire rope manufacturing field, because the fatigue life of manganese phosphate coated steel wire rope far exceeds that of smooth steel wire rope. At the same time, although the price of manganese phosphate coated steel wire rope is slightly higher than that of smooth steel wire rope, its daily average use cost is only about one-third of that of smooth steel wire rope due to its ultra-long service life. Manganese phosphate film is a wear-resistant coating that completely solves the problem of micro-motion wear of steel wire rope. In addition, the phosphate film is non-conductive and has good corrosion resistance. This is the reason why the fatigue life of manganese phosphate coated steel wire rope is greatly improved. Manganese phosphate coated steel wire rope is extremely wear-resistant, not easy to damage and very durable. Add a 2.0mm manganese phosphate coated steel wire rope on each side.

[0033] Specifically, the number of first cable cores is 6, the number of second cable cores and third cable cores is 1, and the structure of the cable from left to right is steel wire 11, first cable core, first cable core, first cable core, first cable core, second cable core, first cable core, third cable core, first cable core, steel wire 11.

[0034] As a preferred embodiment of the utility model, the main conductor 1 is a conductor twisted from a Class 5 tinned copper wire bundle, the control main conductor 3 is a conductor twisted from a Class 5 copper foil wire bundle, the control main core conductor 7, the first control core conductor 5, and the second control core conductor 9 are conductors twisted from a Class 6 copper foil wire bundle; the main insulation 2, the control main insulation 4, the control main core insulation 8, the first control core insulation 6, and the second control core insulation 10 are flame-retardant and cold-resistant nitrile polyvinyl chloride insulation layers.

[0035] As a preferred embodiment of the utility model, the main conductor 1 is a conductor formed by twisting 330 tinned wire bundles with a diameter of 0.52 mm, with a twisting pitch of 112 to 149 mm; the control main conductor 3 is a conductor formed by twisting 166 copper foil wire bundles with a diameter of 0.52 mm, with a twisting pitch of 80 to 104 mm; the control main core conductor 7 is formed by twisting 113 copper foil wire bundles with a diameter of 0.26 mm, with a twisting pitch of 32 to 42 mm; the first control core conductor 5 and the second control core conductor 9 are formed by twisting 28 copper foil wire bundles with a diameter of 0.26 mm, with a twisting pitch of 18 to 23 mm.

[0036] The main conductor 1 adopts the fifth category tinned copper wire, and the conductor is made of 330 tinned wire bundles with a diameter of 0.52mm, and the twisting pitch is 112-149mm. It is made of multiple strands of tinned copper wires, which effectively improves its swing bending performance and has good bending characteristics.

[0037] The main insulation 2 adopts flame-retardant and cold-resistant nitrile polyvinyl chloride insulation, and the extrusion method adopts extrusion. The nominal insulation thickness is 2.2mm, the average insulation thickness is not less than the nominal thickness, and the thinnest point is not less than 90% of the nominal value.

[0038] The control main conductor 3 is made of Class 5 copper foil wire bundles, and the conductor is made of 166 copper foil wire bundles with a diameter of 0.52 mm and a twisting pitch of 80 to 104 mm.

[0039] The control main insulation 4 adopts flame retardant and cold resistant nitrile polyvinyl chloride insulation, and the extrusion method adopts extrusion. The nominal insulation thickness is 1.2mm, the average insulation thickness is not less than the nominal thickness, and the thinnest point is not less than 90% of the nominal value.

[0040] The first control line core conductor 5 and the second control line core conductor 9 are made of Class 6 copper foil wire. The conductors are made of 28 copper foil wire bundles with a diameter of 0.26 mm and a twisting pitch of 18 to 23 mm. The conductors are made of multiple copper foil wires twisted together.

[0041] The first control line core insulation 6 and the second control line core insulation 10 are made of flame-retardant and cold-resistant nitrile polyvinyl chloride insulation, and the extrusion method is extrusion. The nominal insulation thickness is 0.8 mm, the average insulation thickness is not less than the nominal thickness, and the thinnest point is not less than 90% of the nominal value.

[0042] The control main line core conductor 7 adopts the 6th type copper foil wire. The conductor is composed of 113 copper foil wire bundles with a diameter of 0.26mm and a twisting pitch of 32 to 42mm. It is twisted by multiple copper foil wires.

[0043] The control main line core insulation 8 adopts flame retardant and cold resistant nitrile polyvinyl chloride insulation, and the extrusion method adopts extrusion. The nominal insulation thickness is 0.8mm, the average insulation thickness is not less than the nominal thickness, and the thinnest point is not less than 90% of the nominal value.

[0044] The insulation layer is made of flame-retardant and cold-resistant nitrile polyvinyl chloride insulation, which is mainly made of nitrile rubber and mixed with 30% to 50% polyvinyl chloride resin. The blending process uses two latexes, which are mixed in the required proportion and then subjected to coagulation, washing, drying, heat treatment and other processes. Compared with nitrile rubber, nitrile / polyvinyl chloride blended rubber has improved ozone resistance and weather aging resistance, improved tensile strength, tensile stress, tear resistance, heat resistance and flame resistance, improved oil resistance, fuel resistance and chemical resistance, improved extrusion and calendering processing performance, and also improved storage stability, and can be colored arbitrarily. Nitrile / polyvinyl chloride blended rubber is used for wire and cable sheath 12, oil pipe outer layer rubber, leather rollers and leather rings, automotive molded parts, microporous sponges, foam insulation layers, safety boots, etc.

[0045] Specifically, the nominal thickness of the insulation layer of the main insulation 2 is 2.2 mm; the nominal thickness of the insulation layer of the control main insulation 4 is 1.2 mm; the nominal thickness of the insulation layer of the control main core insulation 8, the first control core insulation 6, and the second control core insulation 10 is 0.8 mm; the average thickness of the insulation layer is not less than the nominal thickness, and the thinnest point is not less than 90% of the nominal value.

[0046] Specifically, a gap is provided between the wire cores, and the sheath 12 is a flame retardant polyurethane PUR sheath; the gap between the wire cores is not less than 3 mm. The gap between the wire cores is not less than 3 mm to prevent electromagnetic field interference between the wire cores.

[0047] The sheath is made of flame-retardant polyurethane PUR, and the sheath is extruded by extrusion. The production speed is controlled within 15 m / min. Too fast production speed will lead to high extrusion pressure and unstable sheath eccentricity. The extrusion temperature of the fuselage is 195±5℃, and the extrusion temperature of the die head is 208±5℃, otherwise it may affect the appearance quality of the product and the electrical and mechanical properties of the sheath layer. Flame-retardant polyurethane PUR is a power cable sheath material with good electrical insulation and fire resistance. It is made of flame-retardant rubber and has the characteristics of self-extinguishing, anti-aging, anti-corrosion, oil resistance and ozone resistance. The flame-retardant polyurethane PUR sheath can be used for a long time in outdoor and humid environments, and can withstand high mechanical pressure, with good wear resistance and tensile strength. As an important power cable sheath material, the flame-retardant polyurethane PUR sheath has the advantages of fire resistance, oil resistance, wear resistance, and high tensile strength, and is suitable for cable protection in various industrial environments. When choosing rubber insulation flame-retardant sheath products, you should choose the material and specifications that suit you according to your specific usage needs.

[0048] In the prior art, most cable outer sheaths are extruded from polyvinyl chloride (PVC), while the outer sheath layer of the sheath material of the utility model is made of flame-retardant polyurethane PUR sheath material, which has the characteristics of flame retardancy, oil resistance, acid and alkali resistance, hydrolysis resistance, UV resistance, low temperature resistance, and wear resistance. It effectively solves the environmental protection requirements of cable flexibility, rat bite resistance, drag resistance, high and low temperature resistance, waterproof and moisture resistance, and low smoke and halogen-free flame retardancy in multiple environments and places.

[0049] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a parallel rail transit cable, which solves the technical problems of low safety performance of traditional cables, distortion of transmission signals, breakage of cables after repeated bending, and construction difficulties. At the same time, the structure is stable and not easily squeezed and deformed, the electrical performance is more superior, and the signal transmission is stable, safe and reliable.

[0050] To achieve the above purpose, the utility model adopts an insulation layer extruded outside the conductor, and the insulated single wires composed of the conductor and the insulation layer are twisted to form a wire group. The flame-retardant and cold-resistant nitrile polyvinyl chloride insulation has plasticizers and modified fillers, which helps to enhance the flexibility of the cable in a low-temperature environment, thereby preventing it from cracking due to increased brittleness under low-temperature conditions. A 2.0mm manganese phosphating coated steel wire rope is added on each side, which has a very long service life, and its average daily cost is only about one-third of that of a smooth steel wire rope. The insulation is extruded with an outer sheath.

[0051] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the protection scope of the present invention.

Claims

1. A rail transit cable, comprising a plurality of cable cores and a sheath wrapping the cable cores, characterized in that: A plurality of the cable cores are arranged side by side in a cable, and the cross section of the cable is in the shape of a transverse strip; The cable core includes a first cable core, a second cable core, and a third cable core; The first cable core includes a main conductor and a main insulation; The second cable core includes a first core and a plurality of second cores surrounding the first core; The third cable core includes a plurality of third cores and a plurality of fourth cores; The second core includes a first control core conductor and a first control core insulation wrapped around the outer layer of the first control core conductor; The fourth core includes a second control core conductor and a second control core insulation wrapped around the outer layer of the second control core conductor.

2. A rail transit cable according to claim 1, characterized in that: A plurality of the third cores are wound in a loop, and a plurality of the fourth cores are wound around the wound third cores.

3. A rail transit cable according to claim 2, characterized in that: The first core includes a control main conductor and a control main insulation wrapped around the outer layer of the control main conductor; the third core includes a control main core conductor and a control main core insulation wrapped around the outer layer of the control main core conductor.

4. A rail transit cable according to claim 3, characterized in that: The cable also includes steel wires, and the steel wires are arranged at both transverse ends of the cable.

5. A rail transit cable according to claim 4, characterized in that: The number of the first cable cores is 6, the number of the second cable core and the third cable core is 1, and the structure of the cable from left to right is steel wire, first cable core, first cable core, first cable core, first cable core, second cable core, first cable core, third cable core, first cable core, steel wire.

6. A rail transit cable according to claim 5, characterized in that: The main conductor is a conductor twisted from a Category 5 tinned copper wire bundle, the control main conductor is a conductor twisted from a Category 5 copper foil wire bundle, the control main core conductor, the first control core conductor, and the second control core conductor are conductors twisted from a Category 6 copper foil wire bundle; the main insulation, control main insulation, control main core insulation, first control core insulation, and second control core insulation are flame-retardant and cold-resistant nitrile polyvinyl chloride insulation layers.

7. A rail transit cable according to claim 6, characterized in that: The main conductor is a conductor formed by twisting 330 tinned wire bundles with a diameter of 0.52 mm, with a twisting pitch of 112 to 149 mm; the control main conductor is a conductor formed by twisting 166 copper foil wire bundles with a diameter of 0.52 mm, with a twisting pitch of 80 to 104 mm; the control main line core conductor is a conductor formed by twisting 113 copper foil wire bundles with a diameter of 0.26 mm, with a twisting pitch of 32 to 42 mm; the first control line core conductor and the second control line core conductor are formed by twisting 28 copper foil wire bundles with a diameter of 0.26 mm, with a twisting pitch of 18 to 23 mm.

8. A rail transit cable according to claim 6 or 7, characterized in that: The nominal thickness of the insulation layer of the main insulation is 2.2mm; the nominal thickness of the insulation layer of the control main insulation is 1.2mm; the nominal thickness of the insulation layer of the control main core insulation, the first control core insulation, and the second control core insulation is 0.8mm; the average thickness of the insulation layer is not less than the nominal thickness, and the thinnest point is not less than 90% of the nominal value.

9. A rail transit cable according to any one of claims 4 to 7, characterized in that: A gap is provided between the wire cores, and the gap is not less than 2 mm.

10. A rail transit cable according to claim 9, characterized in that: The steel wire is a manganese phosphating coated steel wire rope, and the sheath is a flame retardant polyurethane PUR sheath; the gap between the wire cores is not less than 3 mm.

Images