Low-capacitance environment-friendly intelligent rail transit signal special flexible cable

Abstract

A low-capacitance environment-friendly intelligent track traffic signal special flexible cable is characterized by comprising two signal lines, a filling body, a belting layer and a sheath layer, the cable core assembly comprises two groups of signal wire pairs, one group is a working wire pair, the other group is a standby wire pair, functions of lightning protection and stray capacitance elimination and a comprehensive waterproof function are taken into consideration, so that the cable has low capacitance and excellent wear resistance, is applied to occasions such as new construction or quality improvement and reconstruction of urban rails or subway lines, greatly reduces the construction cost of railway signals, and has good application prospects. The cable is simple in structure, considerable in economic value and application value, low in capacitance, excellent in cable water resistance, interference resistance and wear resistance and small in signal attenuation, the safety and reliability of line operation are greatly improved, the railway signal construction cost can be effectively reduced, and the cable has popularization and application value.

Description

Technical Field

[0001] This utility model relates to the field of traffic signal cable technology, and in particular to a low-capacitance, environmentally friendly, intelligent rail transit signal special flexible cable. Background Technology

[0002] Currently, during railway or urban rail signal transmission, signal attenuation and distortion occur due to factors such as line resistance and inductance. To compensate for these losses and ensure stable signal transmission, it is necessary to introduce compensating capacitors and matching signal cables.

[0003] Existing signal cables have large capacitance and small inductance, resulting in significant signal attenuation and requiring close spacing between signal lights. This leads to high investment in signal indication on train lines. To reduce construction costs, a new type of cable structure is needed that connects to a compensating capacitor. This can extend the signal transmission distance, reduce the need for signal relay stations, and thus lower railway construction costs.

[0004] In addition, due to the requirements of the working environment, the existing cable structure cannot meet the needs in terms of waterproofing, moisture resistance, anti-interference ability and wear resistance, which affects the safety and reliability of the line and seriously affects the safe operation of railway or urban rail trains. Summary of the Invention

[0005] This utility model addresses the problems mentioned in the background art by providing a low-capacitance, environmentally friendly, intelligent rail transit signal special flexible cable. It features low capacitance, excellent waterproof, anti-interference, and wear-resistant properties, and low signal attenuation, effectively reducing the construction cost of railway signaling.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A low-capacitance, environmentally friendly, intelligent rail transit signal special flexible cable, characterized by comprising two signal wires, a filler, a wrapping layer, and a sheath layer;

[0008] Each signal line comprises two conductors with ethylene propylene rubber insulation, a grounding wire, and a composite sheath. The conductors within the conductors are square-section aluminum alloy conductors. Utilizing low-capacitance square aluminum alloy conductors and ethylene propylene rubber insulation with a relatively low dielectric constant, the insulation thickness is increased to increase the distance between the wire pairs and reduce the working capacitance of the wire core to ground. This is because the working capacitance is directly proportional to the dielectric constant of the material and inversely proportional to the logarithm of the ratio of the insulation outer diameter to the conductor outer diameter. A grounding wire is located on one side between the two conductors. The composite sheath wraps the two conductors and the grounding wire into a single signal line. The composite sheath is a 0.05mm thick film structure made of aluminum-plastic composite material. This structure acts as a water-blocking layer and shields against external interference signals, thus ensuring that the electrical performance of each signal line does not degrade.

[0009] Each of the two signal lines has a filler on both sides. The filler is a semi-vulcanized rubber strip with certain mechanical properties to maintain the stability of the cable structure.

[0010] The two signal lines and two fillers form a cable core assembly, which is bound and rounded by the wrapping layer, which is made of polyester material with a thickness of 0.03mm.

[0011] The outer layer of the tape is extruded with a sheath layer.

[0012] A further aspect of this invention is that the grounding wire is made of stranded annealed soft copper conductors with a conductor cross-section of 0.2-0.35 mm². 2 The grounding wire dissipates the induced current through the grounding resistance, thereby reducing the current loss to the air capacitor and also providing lightning protection.

[0013] A further aspect of this invention is that the wrapping layer is made of polyester material with a thickness of 0.03mm, which can tightly bind the cable core assembly without loosening it while maintaining the stability of the structure.

[0014] A further aspect of this invention is that the sheath layer is made of low-smoke, halogen-free polyolefin elastomer material, which is an environmentally friendly material and does not contain heavy metals such as lead and cadmium.

[0015] The beneficial effects of this utility model are as follows: The cable core assembly contains two sets of signal wire pairs, one set as the working pair and the other set as the spare pair. It also takes into account the functions of lightning protection, stray capacitance elimination, and comprehensive waterproofing. This makes the cable have low capacitance and excellent wear resistance. It can be used in the construction or upgrading of urban rail or subway lines, which greatly reduces the construction cost of railway signaling. Its economic and application value is considerable. It has low capacitance, excellent waterproof, anti-interference, and wear resistance, and low signal attenuation, which greatly improves the safety and reliability of line operation. It can effectively reduce the construction cost of railway signaling and has promotion and application value. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Example

[0018] like Figure 1 As shown, a low-capacitance, environmentally friendly, intelligent rail transit signal special flexible cable includes two signal wires, a filler 2, a wrapping layer 3, and a sheath layer 4.

[0019] Each signal line includes two conductors 11 with ethylene propylene rubber insulation, a grounding wire 12, and a composite sheath 13. The conductor inside the conductor 11 is an aluminum alloy conductor with a square cross-section. The grounding wire 12 is provided on one side between the two conductors. The composite sheath 13 wraps the two conductors 11 and the grounding wire 12 into a signal line as a whole. The composite sheath 13 is a film structure made of aluminum-plastic composite material with a thickness of 0.05 mm.

[0020] Each of the two signal lines is provided with a filler 2 on both sides, and the filler 2 is a semi-vulcanized rubber strip;

[0021] The two signal lines and the two fillers 2 form a cable core assembly, which is tightly bound and rounded by the wrapping layer 3. The wrapping layer 3 is made of polyester material and has a thickness of 0.03mm.

[0022] The outer sheath layer 4 is extruded over the outer layer of the tape layer 3.

[0023] The grounding wire 12 is made of annealed soft copper conductors stranded together, with a conductor cross-section of 0.2-0.35 mm². 2 The grounding wire dissipates the induced current through the grounding resistance, thereby reducing the current loss to the air capacitor and also providing lightning protection.

[0024] The wrapping layer 3 is made of polyester material with a thickness of 0.03mm, which can tightly bind the cable core assembly without loosening while maintaining the stability of the structure.

[0025] The sheath layer 4 is a low-smoke, halogen-free polyolefin elastomer material, which is an environmentally friendly material and does not contain heavy metals such as lead and cadmium.

Claims

1. A low-capacitance environmentally friendly intelligent rail transit signal special soft cable, characterized in that It comprises two signal lines, filling bodies, a wrapping layer and a sheath layer. Each of the signal lines comprises two conductive lines with EPR insulation layer, a grounding line and a composite sheath, the conductor in the conductive line is an aluminum alloy conductor with square cross section, the grounding line is arranged on one side between the two conductive lines, the composite sheath is made of aluminum-plastic composite material and has a film structure with thickness of 0.05mm, and the composite sheath winds and covers the two conductive lines and the grounding line as a whole. Two filling bodies are arranged on both sides of the two signal lines, and the filling bodies are rubber strips in semi-vulcanized state. The cable core assembly composed of the two signal lines and the two filling bodies is tightly bound and covered by the wrapping layer, and the wrapping layer is made of polyester material and has thickness of 0.03mm. The wrapping layer is extruded and covered by the sheath layer.

2. The low-capacitance environmentally friendly intelligent rail transit signal special soft cable of claim 1, wherein the cable is characterized by The grounding wire is made of annealed soft copper conductor stranded together, with a conductor cross section of 0.2-0.35 mm 2 . 3.The low-capacitance environmentally-friendly intelligent rail transit signal special soft cable of claim 1 or 2, characterized in that The wrapping layer is made of polyester material and has thickness of 0.03mm.

4. The low-capacitance environmentally friendly intelligent rail transit signal special soft cable of claim 1 or 2, characterized in that The sheath layer is low-smoke halogen-free polyolefin elastomer material.

5. The low-capacitance environmentally friendly intelligent rail transit signal special soft cable of claim 3, characterized in that The sheath layer is low-smoke halogen-free polyolefin elastomer material.

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