Reinforced railway digital signal cable

Abstract

The invention discloses a reinforced railway digital signal cable, and belongs to the technical field of wires and cables. Comprising a cable core, and a heat insulation layer, a protection layer, a reinforced aluminum sheath layer, an inner cushion layer, a steel tape armoring layer and a sheath layer are sequentially wrapped on the outer side of the cable core from inside to outside. Compared with a common digital signal cable, the digital signal cable has the performance of long-distance, high-power and stable signal transmission; the cable has impact resistance and flattening resistance, so that the cable can slightly deform or does not deform after being impacted by heavy objects on a construction site, flattened and subjected to brutal construction, and normal laying construction of the cable is guaranteed; meanwhile, stable and uninterrupted transmission of cable signals is also ensured; and the appearance of the cable can be well guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of electric wires and cables, and in particular to a reinforced railway digital signal cable. Background Art

[0002] As a signal transmission cable, the reinforced railway digital signal cable is indispensable along the railway lines in various local areas. It is especially suitable for long-distance transmission, construction conditions, and areas with relatively harsh construction environments. Some construction sites need to pass the cable through cable troughs or cable holes, so there are certain requirements for the roundness of the cable. At the construction site, there will inevitably be uncontrollable situations such as long distance, heavy impact or flattening, and rough laying, which will cause the cable transmission distance to be insufficient, deformation or severe deformation, making it impossible to lay the cable normally or transmit signals normally. At this time, the use of reinforced railway digital signal cables can not only ensure that the cable can be laid smoothly, but also ensure that the long-distance full-line signal transmission is always stable and uninterrupted. The internal structure reference standard of the enhanced railway digital signal cable is TB / T 3100-2017, etc. The cable needs to fully comply with the transmission bandwidth of the railway digital signal cable, meet the needs of the railway signal automatic blocking system and the station coded information transmission; it also needs to ensure that the characteristic impedance, working line pair attenuation, phase angle and other indicators in multiple frequency bands can meet the relevant provisions of the railway industry standard TB / T3100-2017 "Railway Digital Signal Cable". At the same time, the cable must also have stronger transmission performance, impact resistance and anti-flattening performance, so that when the cable is impacted and flattened by heavy objects at the construction site, it can still ensure that the basic structure of the cable remains unchanged or slightly deformed, and at the same time ensure the long-distance and normal signal transmission performance of the cable. Summary of the invention

[0003] The purpose of the present invention is to provide a reinforced railway digital signal cable with little or no deformation, which can ensure smooth cable laying and can smoothly transmit signals over long distances. The reinforced railway digital signal cable is suitable for the connection between relevant equipment and control devices in the railway digital signal system, and realizes the transmission of 1MHz analog signal, 2Mbit / s digital signal, and rated voltage AC 750V or DC 1100V and below system control information and electric energy. The reinforced railway digital signal cable has stronger transmission performance, impact resistance and crush resistance than ordinary railway digital signal cables.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A reinforced railway digital signal cable comprises a cable core 1, wherein the outer side of the cable core 1 is covered with a heat insulation layer 8, a protective layer 9, a reinforced aluminum sheath layer 10, an inner cushion layer 11, a steel belt armor layer 12 and a sheath layer 13 in sequence from the inside to the outside.

[0006] The cable core 1 is formed by twisting together a number of insulated single wires 3, a number of pair wire groups 4 and a number of star-shaped quad wire groups 5 and then wrapping them with a cable core tape 6; the single wire 3 is formed by a conductor 2 and an insulating layer extruded outside the conductor 2; the pair wire group 4 is formed by twisting two single wires 3 and then covering them with a sheath; the star-shaped quad wire group 5 is formed by twisting four single wires 3 and then covering them with a sheath.

[0007] The thermal insulation layer 8 is extruded onto the cable core 1 .

[0008] The protective layer 9 is formed by placing an air bag between the reinforced aluminum sheath layer 10 and the heat insulation layer 8 or by wrapping an inflatable belt around the heat insulation layer 8 .

[0009] The reinforced aluminum sheath layer 10 is a tubular structure welded from aluminum alloy.

[0010] The inner cushion layer 11 is formed by extruding plastic around the reinforced aluminum sheath layer 10 .

[0011] The steel belt armor layer 12 is formed by double steel belt gap armor.

[0012] The sheath layer 13 is formed by extruding plastic on the outside of the steel belt armor layer 12 .

[0013] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0014] 1. The present invention has a large cross-section conductor diameter. Among the existing standard and used railway digital signal cables, there are only cables with a conductor diameter of 1.0 mm, while the conductor diameter of the reinforced railway digital signal cable of the present invention can reach 1.4 mm, which can greatly improve the signal transmission power and extend the cable transmission signal distance.

[0015] 2. The protective layer of the present invention is formed by adding a process outside the heat insulation layer of the cable, and adopting a new process to form the protective layer, so that the cable can play a supporting and buffering role when it is impacted or flattened, so that the impact force cannot directly act on the cable core or the insulating core, so as to achieve the purpose of protecting the internal structure of the cable from damage and stably and uninterruptedly transmitting signals.

[0016] 3. The reinforced aluminum sheath layer of the present invention is formed by welding aluminum alloy material, which provides protection while also providing a shielding layer, greatly enhancing the impact resistance and crush resistance of the cable.

[0017] 4. The performance indicators of the reinforced railway digital signal cable provided by the present invention, including primary parameters (DC resistance, insulation resistance, insulation withstand voltage strength, working capacitance, capacitance coupling coefficient and ground capacitance unbalance, etc.) and secondary parameters (characteristic impedance, line pair attenuation, phase angle, etc.), all comply with the standard values ​​of TB / T3100-2017 "Railway Digital Signal Cable".

[0018] In summary, the reinforced railway digital signal cable provided by the present invention has the performance of long-distance, high-power stable signal transmission compared with ordinary digital signal cables; it has better impact resistance and crushing resistance, so that the cable can be slightly deformed or not deformed after being impacted, crushed by heavy objects and rough construction at the construction site, ensuring the normal laying and construction of the cable; at the same time, it also ensures the stable and uninterrupted transmission of the cable signal; and the appearance of the cable can also be best guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 It is a schematic diagram of the cable core structure of the present invention;

[0021] In the figure: 1. Cable core; 2. Conductor; 3. Single wire; 4. Pair of wires; 5. Four-wire group; 6. Cable core wrapping tape; 8. Thermal insulation layer; 9. Protective layer; 10. Reinforced aluminum sheath layer; 11. Inner cushion layer; 12. Steel belt armor layer; 13. Sheath layer. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] Example 1

[0026] like Figure 1-2The present embodiment provides a reinforced railway digital signal cable, comprising a cable core 1, wherein the outer side of the cable core 1 is sequentially coated with a heat insulation layer 8, a protective layer 9, a reinforced aluminum sheath layer 10, an inner cushion layer 11, a steel belt armor layer 12 and a sheath layer 13 from the inside to the outside.

[0027] The cable core 1 is formed by twisting together a plurality of insulated single wires 3, a plurality of pair wire groups 4 and a plurality of star-shaped quad wire groups 5 and then wrapping them with a cable core tape 6; the single wire 3 is an insulated single wire formed by a conductor 2 and an insulating layer extruded outside the conductor 2; the pair wire group 4 is formed by twisting two single wires 3 and then covering them with a sheath; the star-shaped quad wire group 5 is formed by twisting four single wires 3 and then covering them with a sheath.

[0028] The heat insulation layer 8 is a heat insulation layer extruded outside the cable core 1 to prevent the cable core from being burned.

[0029] The protective layer 9 is formed by placing a shrinkable airbag between the reinforced aluminum sheath layer 10 and the heat insulation layer 8 or by wrapping an inflatable belt on the heat insulation layer 8. This process can be completed separately or simultaneously with the production of the reinforced aluminum sheath layer 10 to ensure that the cable can still transmit signals stably and uninterruptedly after being damaged. The protective layer 9 supports and buffers the cable when it is impacted or crushed, so that the impact force cannot directly act on the cable core or the insulation core, so as to protect the internal structure of the cable from damage and ensure stable and uninterrupted signal transmission.

[0030] The reinforced aluminum sheath layer 10 is a tubular metal sheath made of raw materials such as aluminum alloy by welding technology. Its function is to ensure the shielding performance of the cable while forming a metal protective layer with better strength, ensuring the cable deformation as small as possible, making the cable construction and laying smoother, and at the same time, it can maximize the roundness of the cable appearance and make it more beautiful. That is, the reinforced aluminum sheath layer 10 provides protection for the cable core and also provides a shielding layer, greatly enhancing the impact resistance and crushing resistance of the cable.

[0031] The inner cushion layer 11 is formed by wrapping the cushion layer plastic around the reinforced aluminum sheath layer 10 using an extrusion process to form a mechanical buffer layer for the steel belt armor layer 12 .

[0032] The steel belt armor layer 12 is a double steel belt gap armor, forming a mechanical protection layer of the cable, so that the impact resistance and crush resistance of the cable are better.

[0033] The sheath layer 13 is formed by extruding an outer sheath plastic over the steel belt armor layer 12 to form the outermost outer sheath of the cable.

[0034] The invention has a large cross-section conductor diameter. Among the existing standard and used railway digital signal cables, there are only cables with a conductor diameter of 1.0 mm, while the conductor diameter of the reinforced railway digital signal cable of the invention can reach 1.4 mm, which can greatly improve the signal transmission power and extend the cable transmission signal distance.

[0035] The performance indicators of the reinforced railway digital signal cable provided by the present invention, including primary parameters (DC resistance, insulation resistance, insulation withstand voltage strength, working capacitance, capacitance coupling coefficient and ground capacitance imbalance, etc.) and secondary parameters (characteristic impedance, line pair attenuation, phase angle, etc.), all meet the standard values ​​specified in TB / T3100-2017 "Railway Digital Signal Cable".

[0036] The reinforced railway digital signal cable provided by the present invention has the performance of long-distance, high-power stable signal transmission compared with ordinary digital signal cables; it has better impact resistance and crushing resistance, so that the cable can be slightly deformed or not deformed after being impacted, crushed by heavy objects and rough construction at the construction site, ensuring the normal laying and construction of the cable; at the same time, it also ensures stable and uninterrupted transmission of the cable signal; and the appearance of the cable can also be best guaranteed.

Claims

1. A reinforced railway digital signal cable, comprising a cable core (1), characterized in that: The outer side of the cable core (1) is sequentially coated with a heat insulation layer (8), a protective layer (9), a reinforced aluminum sheath layer (10), an inner cushion layer (11), a steel belt armor layer (12) and a sheath layer (13) from the inside to the outside.

2. The reinforced railway digital signal cable according to claim 1, characterized in that: The cable core (1) is formed by twisting together a plurality of insulated single wires (3), a plurality of wire pairs (4) and a plurality of star-shaped quad wire groups (5) and then wrapping them with a cable core wrapping tape (6); the single wire (3) is formed by a conductor (2) and an insulating layer extruded outside the conductor (2); the wire pair (4) is formed by twisting two single wires (3) and then wrapping them with a sheath; and the star-shaped quad wire group (5) is formed by twisting four single wires (3) and then wrapping them with a sheath.

3. The reinforced railway digital signal cable according to claim 1, characterized in that: The heat insulation layer (8) is extruded onto the cable core (1).

4. The reinforced railway digital signal cable according to claim 1, characterized in that: The protective layer (9) is formed by placing an air bag between the reinforced aluminum sheath layer (10) and the heat insulation layer (8) or by wrapping an inflatable belt around the heat insulation layer (8).

5. The reinforced railway digital signal cable according to claim 1, characterized in that: The reinforced aluminum sheath layer (10) is a tubular structure welded from aluminum alloy.

6. The reinforced railway digital signal cable according to claim 1, characterized in that: The inner cushion layer (11) is formed by extruding plastic outside the reinforced aluminum sheath layer (10).

7. The reinforced railway digital signal cable according to claim 1, characterized in that: The steel belt armor layer (12) is formed by double steel belt gap armor.

8. The reinforced railway digital signal cable according to claim 1, characterized in that: The sheath layer (13) is formed by extruding plastic outside the steel belt armor layer (12).

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