Cable for underground track communication

Abstract

The utility model relates to the technical field of cables for communication, and discloses a cable for underground track communication, which comprises a cable body, an outer protective layer arranged inside the cable body, an armor layer arranged inside the outer protective layer, an inner protective layer arranged inside the armor layer, a shielding layer arranged inside the inner protective layer, and an outer protective layer arranged inside the shielding layer. A shielding layer is arranged in the cable body, a filling layer is arranged in the shielding layer, an insulating layer is arranged in the filling layer, a cable core is arranged in the insulating layer, and fixing grooves are formed in the two sides of the interior of the cable body. According to the cable for underground track communication, through the arrangement, the fixing grooves and the fixing blocks, excessive twisting force is prevented from being accumulated in the twisting process, so that it is ensured that communication signals can be stably transmitted, excessive accumulation of the twisting force is prevented, and performance reduction of a communication system is avoided; and the stability of signal transmission is also ensured.

Description

Technical Field

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

[0002] A cable for underground rail communication is usually designed specifically for the complex and changeable underground environment, with excellent electrical performance, mechanical performance and anti-interference ability. This kind of cable plays a crucial role in rail transit systems such as subways and light rails, and is used to transmit signals, data and electricity to ensure the normal operation and smooth communication of the rail transit system.

[0003] During the cable laying process, due to terrain undulation, bend design and improper operation of traction equipment, the cable is often twisted to varying degrees. This kind of twist is not limited to the straight section of the cable, but is more common at bends and turning points. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is that in the prior art, there is a defect that the communication cable is easily damaged due to the accumulation of torsional force during the twisting process. Therefore, we propose a communication cable for underground rail transit.

[0005] In order to achieve the above purpose, the present application adopts the following technical scheme: A communication cable for underground rail transit, including a cable body. An outer protective layer is arranged inside the cable body, an armor layer is arranged inside the outer protective layer, an inner protective layer is arranged inside the armor layer, a shielding layer is arranged inside the inner protective layer, a filling layer is arranged inside the shielding layer, an insulating layer is arranged inside the filling layer, and a wire core is arranged inside the insulating layer. Fixed grooves are opened on both sides inside the cable body, and fixed blocks are fixedly connected to both sides of the outer protective layer.

[0006] Preferably, the material of the outer protective layer is polyvinyl chloride.

[0007] Preferably, the material of the armor layer is a metal strip.

[0008] Preferably, the material of the inner protective layer is polyolefin.

[0009] Preferably, the material of the shielding layer is aluminum foil.

[0010] Preferably, the material of the filling layer is polyester.

[0011] Preferably, the material of the insulating layer is cross-linked polyethylene.

[0012] The technical effects and advantages of the utility model:

[0013] In the present utility model, through the above arrangements, by means of the fixed slots and fixed blocks, in order to avoid excessive torsional force accumulation during the twisting process, thus ensuring stable transmission of communication signals, preventing excessive accumulation of torsional force, avoiding degradation of the performance of the communication system, and ensuring the stability of signal transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is the front view structural schematic diagram of the present utility model;

[0015] Figure 2 is the partial sectional view structural schematic diagram of the present utility model;

[0016] Figure 3 is the internal structural schematic diagram of the cable body of the present utility model.

[0017] Legend: 1. Cable body; 2. Outer sheath; 3. Armor layer; 4. Inner sheath; 5. Shielding layer; 6. Filling layer; 7. Insulation layer; 8. Conductor core; 9. Fixed slot; 10. Fixed block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] Now, with reference to the accompanying drawings and preferred embodiments, the present utility model will be further described in detail. These drawings are all simplified schematic diagrams, only showing the basic structure of the present utility model in a schematic manner, so they only show the components related to the present utility model.

[0019] Refer to Figure 1 - Figure 3 As shown, the present utility model provides a technical solution: a cable for underground track communication, including a cable body 1. An outer sheath 2 is arranged inside the cable body 1. An armor layer 3 is arranged inside the outer sheath 2. An inner sheath 4 is arranged inside the armor layer 3. A shielding layer 5 is arranged inside the inner sheath 4. A filling layer 6 is arranged inside the shielding layer 5. An insulation layer 7 is arranged inside the filling layer 6. A conductor core 8 is arranged inside the insulation layer 7. Fixed slots 9 are opened on both sides inside the cable body 1. Fixed blocks 10 are fixedly connected to both sides of the outer sheath 2. Through the above arrangements, by means of the fixed slots 9 and fixed blocks 10, in order to avoid excessive torsional force accumulation during the twisting process, thus ensuring stable transmission of communication signals, preventing excessive accumulation of torsional force, avoiding degradation of the performance of the communication system, and ensuring the stability of signal transmission.

[0020] Refer to Figure 3As shown, in this embodiment: The material of the outer sheath 2 is polyvinyl chloride. By setting the material of the outer sheath 2 to polyvinyl chloride, the chemical corrosion resistance of the cable can be effectively improved. Polyvinyl chloride, as a widely used plastic material, has good mechanical strength and weather resistance, and its ability to resist chemicals such as acids, alkalis, and salts is relatively strong. Therefore, it performs excellently in the application of the cable outer sheath 2.

[0021] Refer to Figure 3 As shown, in this embodiment: The material of the armor layer 3 is a metal strip. By setting the material of the armor layer 3 to a metal strip, the mechanical strength and anti-external interference ability of the cable can be effectively improved. The armor layer 3 usually uses a steel strip or an aluminum strip. These metal strips are tightly wound around the outer layer of the cable to form a strong barrier. In a harsh environment, such as underground, underwater, or industrial sites, the armor layer 3 can protect the cable from physical damage, extrusion, and corrosion.

[0022] Refer to Figure 3 As shown, in this embodiment: The material of the inner sheath 4 is polyolefin. By setting the material of the inner sheath 4 to polyolefin, the insulation performance of the cable can be effectively improved. Polyolefin materials have excellent electrical insulation, heat resistance, and chemical stability, and can maintain good mechanical properties within a relatively wide temperature range. In addition, polyolefin materials also have a low dielectric constant and dielectric loss factor, thereby further improving the transmission efficiency and signal quality of the cable.

[0023] Refer to Figure 3 As shown, in this embodiment: The material of the shielding layer 5 is aluminum foil. By setting the material of the shielding layer 5 to aluminum foil, the cable can effectively reduce electromagnetic interference and ensure the stability and reliability of signal transmission. Aluminum foil has excellent electrical conductivity and can reflect and absorb electromagnetic waves, thereby protecting the internal conductor from the influence of external electromagnetic interference.

[0024] Refer to Figure 3 As shown, in this embodiment: The material of the filling layer 6 is polyester. By setting the material of the filling layer 6 to polyester, the stability and durability of the overall structure can be effectively improved. Polyester materials have excellent tensile and tear resistance, making them perform well under heavy pressure and impact. In addition, the chemical stability of polyester also enables it to maintain good performance under various environmental conditions and is not easily affected by corrosion and aging.

[0025] Refer to Figure 3 As shown, in this embodiment: The material of the insulation layer 7 is cross-linked polyethylene. By setting the material of the insulation layer 7 to cross-linked polyethylene, the cable can still maintain good electrical performance under high temperature and harsh environments. Cross-linked polyethylene has excellent mechanical strength and chemical corrosion resistance, enabling it to provide reliable protection in various complex environments.

[0026] Working principle: Through the above settings, with the provision of the fixing groove 9 and the fixing block 10, in order to avoid excessive torsional force accumulation during the twisting process, thus ensuring the stable transmission of communication signals, preventing the excessive accumulation of torsional force, avoiding the degradation of the performance of the communication system, and ensuring the stability of signal transmission. Through the setting that the material of the outer sheath 2 is polyvinyl chloride, the chemical corrosion resistance of the cable can be effectively improved. Polyvinyl chloride, as a widely used plastic material, has good mechanical strength and weather resistance, and its ability to resist chemicals such as acids, alkalis, and salts is relatively strong. Therefore, it performs excellently in the application of the cable outer sheath 2. Through the setting that the material of the armor layer 3 is a metal strip, the mechanical strength and anti-external interference ability of the cable can be effectively improved. The armor layer 3 usually uses steel strips or aluminum strips, and these metal strips are tightly wound around the outer layer of the cable to form a strong barrier. In harsh environments, such as underground, underwater, or industrial sites, the armor layer 3 can protect the cable from physical damage, extrusion, and corrosion. Through the setting that the material of the inner sheath 4 is polyolefin, the insulation performance of the cable can be effectively improved. Polyolefin materials have excellent electrical insulation, heat resistance, and chemical stability, and can maintain good mechanical properties within a relatively wide temperature range. In addition, polyolefin materials also have a low dielectric constant and dielectric loss factor, thus further improving the transmission efficiency and signal quality of the cable. Through the setting that the material of the shielding layer 5 is aluminum foil, the cable can effectively reduce electromagnetic interference and ensure the stability and reliability of signal transmission. Aluminum foil has excellent electrical conductivity and can reflect and absorb electromagnetic waves, thus protecting the internal conductor from the influence of external electromagnetic interference. Through the setting that the material of the filling layer 6 is polyester, the stability and durability of the overall structure can be effectively improved. Polyester materials have excellent tensile and tear resistance, making them perform well under heavy pressure and impact. In addition, the chemical stability of polyester also enables it to maintain good performance under various environmental conditions and is not easily affected by corrosion and aging. Through the setting that the material of the insulation layer 7 is cross-linked polyethylene, the cable can still maintain good electrical performance under high temperature and harsh environments. Cross-linked polyethylene has excellent mechanical strength and chemical corrosion resistance, enabling it to provide reliable protection in various complex environments.

[0027] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A cable for underground rail communications, comprising a cable body (1), characterized in that: An outer protective layer (2) is arranged inside the cable body (1), an armor layer (3) is arranged inside the outer protective layer (2), an inner protective layer (4) is arranged inside the armor layer (3), a shielding layer (5) is arranged inside the inner protective layer (4), a filling layer (6) is arranged inside the shielding layer (5), an insulating layer (7) is arranged inside the filling layer (6), a wire core (8) is arranged inside the insulating layer (7), fixing grooves (9) are provided on both sides of the cable body (1), and fixing blocks (10) are fixedly connected to both sides of the outer protective layer (2).

2. A cable for underground rail communications according to claim 1, characterized in that: The material of the outer protective layer (2) is polyvinyl chloride.

3. A cable for underground rail communication according to claim 1, characterized in that: The armor layer (3) is made of metal strip.

4. A cable for underground rail communication according to claim 1, characterized in that: The material of the inner protective layer (4) is polyolefin.

5. The cable for underground rail communication according to claim 1, characterized in that: The shielding layer (5) is made of aluminum foil.

6. The cable for underground rail communication according to claim 1, characterized in that: The material of the filling layer (6) is polyester.

7. The cable for underground rail communication according to claim 1, characterized in that: The material of the insulating layer (7) is cross-linked polyethylene.

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