Waterproof and fireproof track traffic cable

Abstract

The utility model discloses a waterproof and fire-resistant track traffic cable, which comprises a conductor, a fire-resistant layer outside the conductor, an insulating layer wrapped on the fire-resistant layer and a composite waterproof layer outside the insulating layer, and the insulating layer is of a double-layer co-extrusion structure of an inner layer and an outer layer and comprises an inner insulating layer and an outer insulating layer from inside to outside in sequence. And the sixth type tinned copper co-rotating stranded wires are adopted, so that the flexibility and the bending resistance of the cable in a narrow space are ensured. And by overlapping and wrapping the double-layer double-sided calcined mica tape and strictly controlling the overlapping rate, the fire-resistant durability and the electrical insulation performance of the cable are enhanced. The insulating layer adopts a double-layer co-extrusion structure of ethylene propylene rubber and EVA rubber, and is excellent in wear resistance, oil resistance and flame retardance. The composite waterproof technology improves the waterproof sealing performance. And the galvanized steel wire armor layer greatly enhances the tensile strength, the dragging resistance and the overall structural strength of the cable, so that the cable can adapt to complex and changeable rail transit environments.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, specifically to a waterproof and fire-resistant cable for rail transit. Background Technology

[0002] With the development of my country's rail transit construction and the continuous increase in railway mileage, the demand for rail transit cables is increasing day by day. Due to the special nature of its construction and use sites, these cable products have high requirements in terms of safety, environmental protection and other performance aspects. For example, in application scenarios where there is frequent bending or movement in a confined space, the cable needs to have good flexibility and bending resistance; in harsh environments such as humidity and salinity, the cable needs to have good corrosion resistance and waterproof performance; under extreme conditions such as fire, the cable needs to maintain normal current transmission and reduce the risk of short circuit.

[0003] Traditional rail transit cables often have shortcomings in terms of flexibility, corrosion resistance, waterproof performance, and fire resistance. In order to better adapt to the operating environment of China's high-speed railways and improve the various performance characteristics and service life of rail transit cables, this rail transit cable structure was designed. Utility Model Content

[0004] The technical problem to be solved by the utility model: The purpose of this utility model is to overcome the shortcomings of traditional cables in terms of flexibility, bending resistance, and weather resistance, and to provide a waterproof and fire-resistant cable for rail transit, thereby solving the above problems.

[0005] Technical solution: To achieve the above objectives, the technical solution provided by this utility model is as follows: a waterproof and fire-resistant cable for rail transit, comprising a conductor, a fire-resistant layer on the outside of the conductor, an insulation layer wrapped around the fire-resistant layer, and a composite waterproof layer on the outside of the insulation layer. The insulation layer is a double-layer co-extruded structure with inner and outer layers, consisting of an inner insulation layer and an outer insulation layer from the inside out.

[0006] As a further improvement of this utility model, the composite waterproof layer is a double-layer waterproof structure formed by an aluminum strip longitudinally wrapped waterproof layer and a polyethylene extruded waterproof layer.

[0007] This technical solution uses a composite waterproof layer composed of aluminum strip and polyethylene to greatly improve the corrosion resistance and waterproof performance of the cable, ensuring that the cable can maintain good conductivity even in harsh environments.

[0008] As a further improvement to this invention, the conductor is a Class 6 tin-plated soft copper conductor. Traditional cables are prone to breakage in applications involving frequent bending or movement, affecting their stability and service life.

[0009] This technical solution uses Class 6 tin-plated soft copper as the conductor, which is formed by multiple tin-plated copper monofilaments twisted in the same direction, making the cable more flexible, less prone to breakage, and more suitable for applications that require frequent bending or movement.

[0010] As a further improvement of this utility model, the refractory layer is wrapped with double-sided calcined mica tape, and the overlap rate of the refractory layer is greater than 15%.

[0011] Traditional cables are prone to short circuits or failure under extreme conditions such as fires. This technology increases the continuity and density of the fire-resistant layer by precisely controlling the overlap rate of the double-sided calcined mica tape, effectively reducing the paths of heat penetration and flame attack, improving the overall fire barrier effect, and ensuring that the cable can maintain normal current transmission even under extreme conditions such as fires.

[0012] As a further improvement of this utility model, the inner insulation layer is made of ethylene propylene rubber and the outer insulation layer is made of EVA rubber.

[0013] This technical solution adopts an insulation layer with a double-layer co-extruded structure of ethylene propylene rubber and EVA rubber, as well as an EVA rubber sheath layer with good wear resistance, oil resistance and flame retardancy, which meets the requirements of low smoke, halogen-free, oil resistance and acid and alkali resistance of rail transit cables, and improves the overall performance and service life of the cable.

[0014] As a further improvement of this utility model, the composite waterproof layer is made of galvanized steel wire woven into an armor layer, and the armor layer is made of galvanized steel wire with a woven coverage of more than 90%.

[0015] Traditional cables used in rail transit systems often suffer from insufficient tensile and drag resistance. This technology uses galvanized steel wire braided into an armor layer, which improves the cable's tensile and drag resistance, and enhances its strength and bending performance.

[0016] As a further improvement of this utility model, a sheath layer made by extruding EVA rubber is provided on the outside of the armor layer.

[0017] As a further improvement to this utility model, the sheath layer is made of wear-resistant rubber material.

[0018] Beneficial effects

[0019] 1. The present invention provides a waterproof and fire-resistant cable for rail transit. The cable conductor adopts a Class 6 tinned copper stranded conductor, which is more flexible than the Class 5 stranding, to ensure that the cable can maintain good flexibility and bending resistance in confined laying environments.

[0020] 2. The fire-resistant layer is made of double-layer, double-sided calcined mica tape with overlapping wrapping, and the overlap rate is strictly controlled at 15% or more, which enhances the fire resistance and electrical insulation performance of the cable under extreme fire conditions.

[0021] 3. The insulation layer has a double-layer co-extruded structure with inner and outer layers of ethylene propylene rubber and outer layer of EVA rubber, which have excellent wear resistance, oil resistance and flame retardant properties, further enhancing the overall protection capability of the cable.

[0022] 4. A composite waterproofing technology combining longitudinal aluminum tape wrapping and precision polyethylene extrusion is used outside the insulation layer, which enhances the cable's waterproof sealing and ensures its stable operation in humid environments.

[0023] 5. The armor layer, meticulously woven from galvanized steel wire, has a braiding coverage of over 90%, which enhances the cable's tensile strength, drag performance, and overall structural strength, making the cable more resilient and durable in complex and ever-changing rail transit environments. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the waterproof and fire-resistant rail transit cable of this utility model;

[0025] Explanation of the labels in the diagram:

[0026] 1. Conductor; 2. Fire-resistant layer; 3. Insulation layer; 31. Inner insulation layer; 32. Outer insulation layer; 4. Composite waterproof layer; 41. Longitudinal waterproof layer; 42. Extruded waterproof layer; 5. Armor layer; 6. Sheath layer. Detailed Implementation

[0027] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and specific embodiments.

[0028] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0029] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0030] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0031] A waterproof and fire-resistant rail transit cable includes a conductor 1 made of Category 6 tin-plated soft copper, which is formed by multiple tin-plated copper monofilaments twisted in the same direction. Compared with Category 5 conductors, Category 6 tin-plated soft copper is more flexible, making it less prone to breakage when bent and twisted, and suitable for confined laying environments. Category 6 tin-plated soft copper has good corrosion resistance and can maintain good conductivity in harsh environments such as humid and saline-alkali environments.

[0032] The conductor 1 is surrounded by a fire-resistant layer 2 made of double-sided calcined mica tape wrapped in overlapping layers, with an overlap rate controlled at over 15%. Compared with ordinary phlogopite mica tape, double-sided calcined mica tape has stronger fire resistance and better electrical insulation performance, ensuring that the cable can maintain normal current transmission under extreme conditions such as fire, reducing the risk of short circuit. By precisely controlling the overlap rate (over 15%), the continuity and density of the fire-resistant layer are increased, effectively reducing the path of heat penetration and flame attack, and improving the overall fire barrier effect.

[0033] The fire-resistant layer 2 is wrapped with two insulating layers. The insulating layer 3 adopts a double-layer co-extrusion structure with inner and outer rubber layers, namely the inner insulating layer 31 and the outer insulating layer 32. The inner insulating layer 31 is made of ethylene propylene rubber with excellent electrical properties, while the outer insulating layer 32 and the sheath layer 6 are made of EVA rubber with good wear resistance, oil resistance and flame retardancy. It meets the relevant physical and mechanical properties, fire resistance and wear resistance requirements of EMU cables. The combination of rubber insulation material and conductor makes the cable more flexible and increases its environmental resistance.

[0034] An advanced composite waterproof layer 4 is applied outside the insulation layer 3. First, aluminum tape is longitudinally wrapped around the outside of the insulation layer 3 to form a robust longitudinally wrapped waterproof layer 41. Then, through the precision extrusion molding technology of polyethylene material, a tight extruded waterproof layer 42 is set outside the longitudinally wrapped waterproof layer 41. This composite waterproof layer 4, which is formed by longitudinal wrapping of aluminum tape and extrusion molding of polyethylene material, greatly improves the waterproof performance of the cable and ensures its stable operation in a wet environment.

[0035] The composite waterproof layer 4 is covered by an armor layer 5 made of galvanized steel wire. The armor layer 5 is made of galvanized steel wire, and the braiding specifications are determined according to the outer diameter of the cable before armoring. The braiding coverage is over 90%, which improves the cable's tensile and drag resistance, and enhances the cable's strength and bending performance.

[0036] The sheath layer 6 is made of EVA rubber with good wear resistance, oil resistance and flame retardancy. It is vulcanized online during the extrusion process and used in combination with the conductor and insulation layer of the cable. The cable is more flexible and durable, and meets the characteristics of low smoke, halogen-free, oil and acid and alkali resistance, waterproof and fire resistance of rail transit cables.

[0037] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A waterproof and fire-resistant cable for rail transit, characterized in that: The conductor, the fireproof layer outside the conductor, the insulating layer wrapped on the fireproof layer, and the composite waterproof layer outside the insulating layer, the insulating layer is a double-layer co-extrusion structure, and the inner and outer insulating layers are sequentially arranged from inside to outside.

2. The water-proof and fire-resistant cable for rail transit according to claim 1, characterized in that: The composite waterproof layer is a double-layer waterproof structure sequentially formed by an aluminum tape longitudinal waterproof layer and a polyethylene extrusion waterproof layer.

3. The water-proof and fire-resistant cable for rail transit according to claim 1, characterized in that: The conductor is a type 6 tin-plated soft copper conductor.

4. The water-proof and fire-resistant cable for rail transit according to claim 1, characterized in that: The fireproof layer is wrapped by double-sided calcined mica tape, and the lap rate of the fireproof layer is greater than 15%.

5. The water and fire resistant cable for rail transit according to claim 1, characterized in that: The inner insulating layer is made of ethylene-propylene rubber, and the outer insulating layer is made of EVA rubber.

6. The water and fire resistant cable for rail transit according to claim 1, characterized in that: The outer composite waterproof layer is armored by galvanized steel wire, the armored layer is woven by galvanized steel wire, and the weaving coverage rate is greater than 90%.

7. The water and fire resistant cable for rail transit according to claim 6, characterized in that: The outer side of the armored layer is provided with a sheath layer formed by extrusion of EVA rubber.

8. The water-proof and fire-resistant cable for rail transit according to claim 7, characterized in that: The sheath layer is made of wear-resistant rubber material.

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