Anti-crack loose strand type railway through ground wire

Abstract

The utility model discloses an anti-crack loose strand type railway through ground wire, which comprises a wire core, a metal bundle sleeve and an outer sheath, the wire core is formed by mutually twisting a plurality of conductors, the metal bundle sleeve is tightly bundled outside the wire core, and the outer sheath is extruded and coated outside the metal bundle sleeve. According to the utility model, the plurality of tinned copper wires with the outer surfaces provided with the passivation layers with oxidation resistance and corrosion resistance are mutually twisted to form the wire core, so that the wire core has the characteristic of corrosion resistance directly, and the metal bundle sleeve made of brass alloy and the outer sheath made of low-smoke halogen-free flame-retardant polyolefin are sequentially coated outside the wire core; on one hand, the metal bundle sleeve can be used for tightly bundling the wire cores, the phenomena of crack and strand loosening of the wire cores are avoided, and on the other hand, the outer sheath can be used for preventing the wire cores and the metal bundle sleeve from being burnt off or being corroded by acid and alkali of substances in the natural environment.

Description

[Technical field]

[0001] The utility model relates to the technical field of cables, in particular to the technical field of anti-splitting loose-strand railway through-ground wires. [Background technology]

[0002] The railway signal system is a system for displaying, changing and controlling railway signals. It is the central nervous system of railway operation and is responsible for uploading and issuing various commands and information. Railway signal systems can be divided into station signal control systems, marshalling yard shunting control systems, section signal control systems, train command control systems and train operation control systems according to the application sites. The railway through-ground wire is an important component of the railway signal system. It is mainly used to maintain the consistent working potential of the electrical system, thereby ensuring the safe and reliable grounding of the system equipment and eliminating the potential imbalance current caused by the potential difference between different equipment, such as a railway through-ground wire disclosed in the utility model with announcement number CN216145435U and a new type of photoelectric hybrid railway through-ground wire disclosed in the invention with announcement number CN108053941B.

[0003] However, for the existing railway through-ground wire, the conductor at the core is prone to splitting and loosening, which may cause oxidation and corrosion problems due to moist air or liquid in the middle. In addition, the outermost sheath material of the traditional railway through-ground wire may pollute the environment or has no acid and alkali corrosion resistance. [Contents of the utility model]

[0004] The purpose of the utility model is to solve the problems in the prior art and to propose a split-resistant loose-strand railway through-ground wire, which not only has good environmental protection, flame retardancy and corrosion resistance, but also has high production efficiency and can meet the high standards of modern railway signal systems for equipment performance.

[0005] To achieve the above-mentioned purpose, the utility model proposes a split-resistant loose-strand railway through-ground wire, including a wire core, a metal sheath and an outer sheath. The wire core is formed by twisting a plurality of conductors together, the metal sheath is tightly bundled outside the wire core, and the outer sheath is extruded and covered outside the metal sheath.

[0006] Preferably, the conductor is tinned copper wire.

[0007] Preferably, the metal sleeve is a brass alloy sleeve.

[0008] Preferably, the brass alloy sleeve is a multi-component brass alloy sleeve.

[0009] Preferably, the outer sheath is a low-smoke, halogen-free, flame-retardant polyolefin sheath.

[0010] Preferably, a plurality of elastic bands are wound around the core at intervals along the length direction.

[0011] Preferably, the conductors are arranged in multiple layers from the inside to the outside, and a water-blocking tape is wound between two adjacent layers of the conductors and outside the conductor in the outermost layer.

[0012] Preferably, for two adjacent layers of conductors, the conductors in the outer layer are spirally twisted outside the conductors in the inner layer.

[0013] Preferably, the spiral twisting directions of the conductors in two adjacent layers are opposite.

[0014] Preferably, the coating overlap rate of the water blocking tape is not less than 10%.

[0015] Beneficial effects of the utility model:

[0016] 1) A plurality of tinned copper wires with an anti-oxidation and anti-corrosion passivation layer on the outer surface are twisted together to form a wire core, so that the wire core itself has the characteristics of corrosion resistance, and a metal sheath made of brass alloy and an outer sheath made of low-smoke halogen-free flame-retardant polyolefin are sequentially coated outside the wire core. On the one hand, the metal sheath can be used to tightly bundle the wire core to avoid splitting and loose strands in the wire core. On the other hand, the outer sheath can also be used to prevent the wire core and the metal sheath from being burned or corroded by acids and alkalis in the natural environment;

[0017] 2) By using two-layer tandem co-extrusion technology to cover the metal sheath and outer sheath outside the wire core respectively, not only can the railway through-ground wire have good contact reliability, not easy to deform, and more stable performance, but also can effectively improve the production efficiency of the railway through-ground wire;

[0018] 3) By winding multiple sections of elastic bands in sequence along the length direction outside the wire core, each section of the elastic band can assist the metal sleeve to provide additional elastic contraction force to the wire core, and each section of the elastic band is separated from each other, so that the whole section will not be loose due to relaxation at some points;

[0019] 4) By arranging the conductors of the core in multiple layers from the inside to the outside, and wrapping water-blocking tape between two adjacent layers of conductors and outside the outermost conductor, the water-blocking tape can be used to further prevent or slow down the speed at which moisture penetrates the core.

[0020] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings.

Brief Description of the Drawings

[0021] Figure 1 is a cross-sectional view of the first embodiment;

[0022] Figure 2This is a front view of the second embodiment when the metal sheath and the outer sheath are removed;

[0023] Figure 3 It is a cross-sectional view of the third embodiment.

[0024] In the figure: 1-wire core, 2-metal sheath, 3-outer sheath, 4-elastic band, 5-water blocking tape. [Specific implementation method]

[0025] Embodiment 1:

[0026] See also Figure 1 The utility model discloses a split-resistant loose-strand railway through-ground wire, comprising a wire core 1, a metal sheath 2 and an outer sheath 3. The wire core 1 is formed by twisting a plurality of conductors together. The metal sheath 2 is tightly bundled outside the wire core 1, and the outer sheath 3 is extruded and covered outside the metal sheath 2.

[0027] The conductor is a tinned copper wire, which has good corrosion resistance (the outer surface has a passivation layer that is anti-oxidation and anti-corrosion).

[0028] The metal sheath 2 is a brass alloy sheath, which can be tightly wrapped around the outside of the wire core 1 to reduce the size of the gap of the wire core 1. Specifically, the metal sheath 2 is a multi-element brass alloy sheath (i.e., a sheath made of a brass alloy material commonly used in the market with elements such as tin, manganese or nickel added).

[0029] The outer sheath 3 is a low-smoke, halogen-free, flame-retardant polyolefin sheath.

[0030] The metal sheath 2 and the outer sheath 3 can be extruded in series at the same time.

[0031] Embodiment 2:

[0032] See also Figure 2 Outside the core 1, a plurality of elastic bands 4 are wound in sequence and at intervals along the length direction.

[0033] The rest is the same as in the first embodiment.

[0034] Embodiment three:

[0035] See also Figure 3 The conductors are arranged in multiple layers from the inside to the outside, and a water blocking tape 5 is wound between two adjacent layers of the conductors and outside the conductor in the outermost layer. For example, the core 1 adopts three layers of conductors, the first layer of conductor is one tinned copper wire, the second layer of conductor is six tinned copper wires, and the third layer of conductor is twelve tinned copper wires.

[0036] For two adjacent layers of conductors, the conductors in the outer layer are spirally twisted outside the conductors in the inner layer.

[0037] The spiral twisting directions of the conductors in two adjacent layers are opposite.

[0038] The coating overlap rate of the water blocking tape 5 is not less than 10%. The water blocking tape 5 can be a semi-conductive single-sided water blocking tape or a semi-conductive double-sided water blocking tape.

[0039] The rest is the same as in the second embodiment.

[0040] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention falls within the protection scope of the present invention.

Claims

1. Anti-splitting loose-strand railway through-ground wire, characterized by: The invention comprises a wire core (1), a metal sheath (2) and an outer sheath (3); the wire core (1) is formed by twisting a plurality of conductors together; the metal sheath (2) is tightly bundled outside the wire core (1); and the outer sheath (3) is extruded and covered outside the metal sheath (2).

2. The anti-splitting loose-strand railway through-ground wire according to claim 1, characterized in that: The conductor is a tinned copper wire.

3. The anti-splitting loose-strand railway through-ground wire according to claim 1, characterized in that: The metal sleeve (2) is a brass alloy sleeve.

4. The anti-splitting loose-strand railway through-ground wire according to claim 3, characterized in that: The brass alloy sleeve is a multi-component brass alloy sleeve.

5. The anti-splitting loose-strand railway through-ground wire according to claim 1, characterized in that: The outer sheath (3) is a low-smoke, halogen-free, flame-retardant polyolefin sheath.

6. The anti-splitting loose-strand railway through-ground wire according to claim 1, characterized in that: A plurality of elastic bands (4) are wound around the wire core (1) in sequence and at intervals along the length direction.

7. The anti-splitting loose-strand railway through-ground wire according to any one of claims 1 to 6, characterized in that: The conductors are arranged in multiple layers from the inside to the outside, and conductive water-repellent tapes (5) are wound between two adjacent layers of the conductors and outside the conductor in the outermost layer.

8. The anti-splitting loose-strand railway through-ground wire according to claim 7, characterized in that: For two adjacent layers of conductors, the conductors in the outer layer are spirally twisted outside the conductors in the inner layer.

9. The anti-splitting loose-strand railway through-ground wire according to claim 8, characterized in that: The spiral twisting directions of the conductors in two adjacent layers are opposite.

10. The anti-splitting loose-strand railway through-ground wire according to claim 7, characterized in that: The coating overlap rate of the conductive water-repellent tape (5) is not less than 10%.

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