Composite communication cable for rail transit

Abstract

The utility model relates to a composite communication cable for rail transit, which comprises an outer sheath, a flame-retardant belting layer, an outer shielding layer, a cable core and a reinforcer, and is characterized in that the cable core comprises an inner sheath, an inner shielding layer, a skin-foam-skin insulating layer and a first silver-plated copper conductor core layer. The silver-plated copper conductor reduces transmission attenuation and reduces signal loss. The outer sheath is made of cross-linked polyolefin with small hardness, the inner sheath is made of polyolefin with small hardness, the outer shielding layer is woven by tinned copper foil wires, and the inner shielding layer is woven by soft tinned alloy wires, so that the flexibility of the cable is enhanced. The aramid fiber reinforcer improves the anti-torsion performance of the cable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cables, in particular to a composite communication cable for rail transit. BACKGROUND

[0002] With the rapid development of urban rail transit, the demand for communication cables is growing. As the key channel for information transmission, cables are crucial to the stable operation of trains. During the wiring process of rail transit, due to the limitation of wiring path, cables often bend, and stress is generated during the bending process, affecting the reliability of the wiring harness itself and the wiring.

[0003] In addition, cables applied to the connection of train carriages also need to withstand repeated dynamic stress such as twisting, bending, and stretching during the cable life cycle. Long-term dynamic stress will have a huge impact on the overall performance of the cable, leading to signal transmission failure.

[0004] Therefore, it is particularly urgent to study rail communication cables with good bending stress resistance to ensure the stability of the cable and the reliability of signal transmission in the environment of frequent bending and stretching. SUMMARY

[0005] The purpose of the present application is to solve the technical problems of poor bending stress resistance of existing rail communication cables, leading to poor cable safety and unreliable signal transmission.

[0006] To achieve the above-mentioned purpose, the present application provides a composite communication cable for rail transit, which comprises, from outside to inside, an outer sheath, a flame-retardant tape layer, an outer shielding layer, and a cable core. The cable core comprises a main trunk communication cable, a branch trunk communication cable, and a reinforcing member arranged at the gap between the main trunk communication cable and the branch trunk communication cable. The main trunk communication cable comprises, from outside to inside, a first inner sheath, a first inner shielding layer, and two main trunk communication cable insulating cores. The main trunk communication cable insulating core comprises a first silver-plated copper conductor core layer and a first skin-and-bubble insulating layer covering the first silver-plated copper conductor core layer. The branch trunk communication cable comprises, from outside to inside, a second inner sheath, a second inner shielding layer, and four branch trunk communication cable insulating cores arranged in a quadrilateral shape. The branch trunk communication cable insulating core comprises a second silver-plated copper conductor core layer and a second skin-and-bubble insulating layer covering the second silver-plated copper conductor core layer.

[0007] As a further improvement of the present application, the outer sheath is a cross-linked polyolefin outer sheath.

[0008] As a further improvement of the present application, the first inner sheath and the second inner sheath are both polyolefin sheaths.

[0009] As a further improvement of the present application, the outer shielding layer is a tin-plated copper foil wire braided shielding layer.

[0010] As a further improvement of the application, the tinned copper foil wire braided shielding layer is braided by double-layer copper foil winding nylon wire.

[0011] As a further improvement of the application, the diameter of the double-layer copper foil winding nylon wire is 0.3mm.

[0012] As a further improvement of the application, the first inner shielding layer is a first soft-state tinned alloy wire braided shielding layer, and the second inner shielding layer is a second soft-state tinned alloy wire braided shielding layer.

[0013] As a further improvement of the application, the diameter of the braided wire for the first soft-state tinned alloy wire braided shielding layer is 0.05mm, and the diameter of the braided wire for the second soft-state tinned alloy wire braided shielding layer is 0.05mm.

[0014] As a further improvement of the application, the reinforcing member is an aramid reinforcing member.

[0015] As a further improvement of the application, the number of the aramid reinforcing member is at least 2.

[0016] The beneficial effects of the application are that the composite communication cable for rail transit of the application realizes excellent electromagnetic compatibility and mechanical performance through multi-layer structure design. Among them: the tinned copper foil wire braided shielding layer effectively isolates external electromagnetic interference, protects signal transmission from external influence, and also improves the flexibility of the cable. The crosslinked polyolefin outer sheath and the polyolefin inner sheath improve the flexibility of the cable. The aramid reinforcing member 4 significantly improves the bending resistance of the cable, ensures stable operation in the dynamic environment of rail transit, and improves the durability and reliability of the cable. The silver-plated copper conductor reduces the transmission attenuation of the finished cable and reduces signal transmission loss. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The figure is a structural schematic diagram of the composite communication cable for rail transit of the application.

[0018] In the figure: 1, outer sheath; 2, flame-retardant tape layer; 3, outer shielding layer; 4, reinforcing member; 51, first inner sheath; 52, second inner sheath; 61, first inner shielding layer; 62, second inner shielding layer; 71, first skin bubble skin insulation layer; 72, second skin bubble skin insulation layer; 81, first silver-plated copper conductor core layer; 82, second silver-plated copper conductor core layer. DETAILED DESCRIPTION

[0019] The specific embodiments of the application will be further described in detail below in conjunction with the drawings and examples. The following examples are used to illustrate the application, but are not used to limit the scope of the application.

[0020] The terms "first", "second", "third", "fourth" and the like in the description and claims of this application (if any) are used for distinguishing between similar objects talking about the embodiments and are not necessarily used to describe a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of use in either order.

[0021] The orientation terms such as upper, lower, left, right, front, back, top, bottom and the like (if any) in the description and claims of this application are defined based on the position of the structures in the drawings and the position of the structures relative to each other, only for the purpose of expressing the technical solution clearly and conveniently. It should be understood that the use of orientation terms should not limit the scope of the application claimed.

[0022] To solve the technical problems of poor anti-bending stress, poor cable safety and unreliable signal transmission of existing track communication cables, the application provides a composite communication cable for rail transit, as shown in the structure of which includes, from outside to inside, a cross-linked polyolefin outer sheath 1, a flame-retardant wrapping layer 2, a tinned copper foil wire braided shielding layer and a cable core. The cable core contains a main trunk communication cable, a branch trunk communication cable and aramid reinforcing members 4 arranged in the gap between the main trunk communication cable and the branch trunk communication cable. The main trunk communication cable includes, from outside to inside, a polyolefin sheath, a first soft tinned alloy wire braided shielding layer and two communication cable insulation cores. Each communication cable insulation core contains a first silver-plated copper conductor core layer 81 and a first skin-and-bubble insulation layer 71 wrapped thereon. Another group of communication cables also includes, from outside to inside, a polyolefin sheath, a second soft tinned alloy wire braided shielding layer and four branch trunk communication cable insulation cores arranged in a quadrilateral shape. Each branch trunk communication cable insulation core contains a second silver-plated copper conductor core layer 82 and a second skin-and-bubble insulation layer 72 wrapped thereon. Figure 1 In an optional embodiment, the outer shielding layer 3 is particularly woven by double-layer copper foil winding nylon wire, the diameter of the woven wire is 0.3 mm, and the single woven wire requires that the tensile strength of the single woven wire is greater than or equal to 1.8 kg, and is suitable for 20℃ conductor direct current resistance less than or equal to 2500Ω / km. This design not only ensures the shielding effect, but also enhances the flexibility and durability of the shielding layer.

[0023] In an optional embodiment, the first inner shielding layer 61 and the second inner shielding layer 62 are both woven by soft tinned alloy wire, the single wire for weaving is composed of 7 0.05 mm twisted wires, and the single woven wire requires that the tensile strength is greater than or equal to 350Mpa and the elongation at break is greater than or equal to 6%, which is suitable for 20℃ conductor direct current resistance less than or equal to 1657Ω / km. The first inner shielding layer 61 and the second inner shielding layer 62 improve the flexibility and bending resistance of the cable under the premise of ensuring the electromagnetic shielding effect.

[0024]

[0025] ​In an optional embodiment, the reinforcing member 4 comprises at least two aramid reinforcing members 4 to enhance the overall mechanical strength and stability of the cable, enabling it to withstand the high vibration and high pressure environment in rail transit.

[0026] In addition, the Shore hardness of the crosslinked polyolefin outer sheath 1 is 85±2A, and the Shore hardness of the polyolefin sheath is also 85±2A. The design of the crosslinked polyolefin outer sheath 1 and the polyolefin sheath can reduce the overall hardness of the cable and improve the flexibility of the cable.

[0027] In summary, the communication cable designed in the present application not only provides excellent bending resistance, torsion resistance and electromagnetic shielding effect, but also significantly improves the mechanical strength of the cable through the use of the reinforcing member 4, making it very suitable for use in such demanding environments as rail transit. Through this design, the cable can ensure clear and accurate signal transmission, while improving the reliability and safety of the system and prolonging the service life of the cable.

[0028] The above series of detailed descriptions are only specific descriptions of the feasible embodiments of the present application, and are not intended to limit the protection scope of the present application. Any equivalent embodiments or changes made without departing from the spirit of the present application shall be included in the protection scope of the present application.

Claims

1. A composite communication cable for rail transit, characterized by, From outside to inside, the cable successively comprises an outer sheath, a flame-retardant wrapping layer, an outer shielding layer and a cable core, the cable core comprises a main trunk communication cable, a branch trunk communication cable and a reinforcing member arranged at the interspace of the main trunk communication cable and the branch trunk communication cable, wherein: The main trunk communication cable successively comprises a first inner sheath, a first inner shielding layer and two main trunk communication cable insulated cores from outside to inside, the main trunk communication cable insulated core comprises a first silver-plated copper conductor core layer and a first skin-and-bubble insulating layer covering the first silver-plated copper conductor core layer, The branch trunk communication cable successively comprises a second inner sheath, a second inner shielding layer and four branch trunk communication cable insulated cores from outside to inside, the four branch trunk communication cable insulated cores are arranged in a quadrilateral shape, the branch trunk communication cable insulated core comprises a second silver-plated copper conductor core layer and a second skin-and-bubble insulating layer covering the second silver-plated copper conductor core layer.

2. The composite communication cable for rail transit according to claim 1, characterized in that, The outer sheath is a cross-linked polyolefin outer sheath.

3. The composite communication cable for rail transit according to claim 1, characterized in that, The first inner sheath and the second inner sheath are both polyolefin sheaths.

4. The composite communication cable for rail transit according to claim 1, characterized in that, The outer shielding layer is a tinned copper foil wire braided shielding layer.

5. The composite communication cable for rail transit according to claim 4, characterized in that, The tinned copper foil wire braided shielding layer is braided by double-layer copper foil winding nylon wire.

6. The composite communication cable for rail transit according to claim 5, characterized in that, The diameter of the double-layer copper foil winding nylon wire is 0.3 mm.

7. The composite communication cable for rail transit according to claim 1, characterized in that, The first inner shielding layer is a first soft-state tinned alloy wire braided shielding layer, and the second inner shielding layer is a second soft-state tinned alloy wire braided shielding layer.

8. The composite communication cable for rail transit according to claim 7, characterized in that, The diameter of the braided wire for the first soft-state tinned alloy wire braided shielding layer is 0.05 mm, and the diameter of the braided wire for the second soft-state tinned alloy wire braided shielding layer is 0.05 mm.

9. The composite communication cable for rail transit according to claim 1, characterized in that, The reinforcing member is an aramid reinforcing member.

10. The composite communication cable for rail transit according to claim 9, characterized in that, The number of the aramid reinforcing member is at least two.

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