CN211087979U

CN211087979U - Internal shielding railway digital signal cable

Info

Publication number: CN211087979U
Application number: CN201922139192.5U
Authority: CN
Inventors: 沈小平; 周江
Original assignee: Tongding Interconnection Information Co Ltd; Jiangsu Tongding Optic Electronic Stock Co Ltd
Current assignee: Tongding Interconnection Information Co Ltd; Jiangsu Tongding Optic Electronic Stock Co Ltd
Priority date: 2019-12-03
Filing date: 2019-12-03
Publication date: 2020-07-24
Anticipated expiration: 2029-12-03

Abstract

The utility model provides an internal shield railway digital signal cable, including cable core and the sheath of cladding outside the cable core, the cable core includes at least one shielding four-line group, the shielding four-line group strand by four different colored insulating single lines form, its outside cladding has inboard non-hygroscopicity insulating layer, third shielding layer and outside non-hygroscopicity insulating layer in proper order; the sheath outside the cable core sequentially comprises a cable core belting layer, a fourth shielding layer, a polyethylene bonding sheath, a double-steel-belt armor layer and an outer sheath from inside to outside. The cable shielding layer adopts the composite shielding layer, not only has excellent shielding performance, but also has good performances of electrical conductivity, thermal conductivity, ductility and the like, and simultaneously has simple production process and low manufacturing cost, thereby being a product with high quality and low price.

Description

Internal shielding railway digital signal cable

Technical Field

The utility model belongs to the technical field of the cable, especially, relate to an internal shield railway digital signal cable.

Background

The railway digital signal cable applied to a railway system is very wide in copper material, and the cost of copper accounts for about 60% of the cost of each railway digital signal cable.

Although the copper material has good electrical conductivity, thermal conductivity and ductility, the copper material has insufficient strength and is easy to deform after being stretched, so that the fatal defects of low strength, poor bending performance, short service life and the like of the internal shielding railway digital signal cable in the prior art are caused; in addition, copper materials are often used as shielding layers in the cable, and due to the conductive characteristics of the copper materials, the cable is more focused on absorbing an electric field during electromagnetic shielding; meanwhile, copper materials increasingly belong to scarce resources and are expensive.

Disclosure of Invention

An object of the utility model is to provide an internal shield railway digital signal cable improves the not enough of the copper product of current railway digital signal cable technical application, reduces manufacturing cost when guaranteeing the performance.

Compared with copper materials, the steel material has lower cost, the plain carbon steel is the steel material with the widest application and the largest application, and if the copper material and the plain carbon steel material can be combined, the advantages of the copper material and the plain carbon steel material are fused and applied to the railway digital signal cable shielding layer, the defects of the existing railway digital signal cable technology are effectively improved, and the manufacturing cost of the cable is reduced.

Therefore, the technical scheme of the utility model is realized like this:

an internally shielded railway digital signal cable comprising: the protective layer of the cable core consisting of at least one shielding wire group is provided with a copper-plain carbon steel-copper composite belt shielding layer; the protective layer of the shielding wire group formed by twisting a plurality of insulated single wires is provided with a copper-plain carbon steel-copper composite belt shielding layer; the insulating single wire is provided with a copper-plain carbon steel-copper composite belt shielding layer.

Further, the sheath of the cable core sequentially comprises a cable core belting layer, a fourth shielding layer, a polyethylene bonding sheath, a double-steel-belt armor layer and an outer sheath from inside to outside; wherein the fourth shielding layer is a copper-plain carbon steel-copper composite belt shielding layer.

Furthermore, the fourth shielding layer is a welded shielding layer pipe.

Furthermore, the outer sheath is a halogen-free low-smoke flame-retardant outer sheath.

Further, the protective layer of the shielding wire set is sequentially coated with an inner non-hygroscopic insulating layer, a third shielding layer and an outer non-hygroscopic insulating layer; the third shielding layer is a copper-plain carbon steel-copper composite belt shielding layer.

Furthermore, the third shielding layer is an embossed longitudinally-wrapped shielding layer.

Furthermore, at least one leakage line is arranged between the third shielding layer and the outer non-hygroscopic insulating layer.

Furthermore, the insulated single wire consists of a conductor, an inner insulating layer, a first shielding layer, a physical foaming insulating layer, a second shielding layer and an outer insulating layer, wherein the first shielding layer and the second shielding layer are copper-plain carbon steel-copper composite belt shielding layers.

Furthermore, the first shielding layer and the second shielding layer are embossed longitudinally-wrapped shielding layers.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. the utility model adopts the copper-plain carbon steel-copper composite shielding material, the steel layer is favorable for absorbing the magnetic field in the electromagnetic field, the copper layer is favorable for absorbing the electric field, and the matching of the structure greatly improves the shielding performance, the conductive performance, the heat conduction performance, the extensibility, the tensile strength and the shock resistance of the cable;

2. the insulating single wire adopts double shielding layers, a third shielding layer is arranged outside the four insulating single wires twisted in different colors, a welded fourth shielding layer is arranged outside the cable core wrapping tape, and an electric field and a magnetic field are absorbed for a plurality of times, so that the cable is free from external interference in the signal transmission process, and the signal transmission is stable and reliable.

3. The copper-plain carbon steel-copper composite shielding material is adopted to replace a pure copper plate strip, has the advantages of copper and steel, and is low in manufacturing cost, high in quality and low in price.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention;

wherein:

1. shielding the four-wire set; 2. Insulating the single wire;

3. a conductor; 4. An inner insulating layer;

5. a first shielding layer; 6. Physically foaming the insulating layer;

7. a second shielding layer; 8. An outer insulating layer;

9. an inner non-hygroscopic insulating layer; 10. A third shielding layer;

11. a flow relief line; 12. An outer non-hygroscopic insulating layer;

13. a cable core belting layer; 14. A fourth shielding layer;

15. a polyethylene bonding sheath; 16. A double steel tape armor layer;

17. an outer sheath.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

In the description of the present invention, when a component is referred to as being "secured" to another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed" on another element, it can be directly on the other element or intervening elements may also be present.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

An internal shielding railway digital signal cable comprises a cable core and a protective layer coated outside the cable core, wherein the cable core comprises at least one shielding four-wire group 1, the shielding four-wire group 1 is formed by twisting four insulating single wires 2 with different colors, and the outer side of the shielding four-wire group is sequentially coated with an inner non-hygroscopic insulating layer 9, a third shielding layer 10 and an outer non-hygroscopic insulating layer 12; the sheath outside the cable core sequentially comprises a cable core belting layer 13, a fourth shielding layer 14, a polyethylene bonding sheath layer 15, a double-steel-belt armor layer 16 and an outer sheath 17 from inside to outside.

Wherein at least one leakage line 11 is provided between the third shielding layer 10 and the outer non-hygroscopic insulation layer 12. The drain line 11 is preferably disposed in close contact with the third shield layer 10 and the outer non-hygroscopic insulating layer 12, so that the drain line 11 is prevented from being moved or damaged during wiring or use, thereby preventing the use effect from being affected.

The cable core may comprise two shielded quad sets 1. The insulated single wire 2 comprises a conductor 3, an inner insulating layer 4, a first shielding layer 5, a physical foaming insulating layer 6, a second shielding layer 7 and an outer insulating layer 8, the insulated single wire 2 adopts double shielding layers, and an electric field and a magnetic field are absorbed for multiple times, so that the cable is free from external interference in the signal transmission process, and the signal transmission is stable and reliable.

The first shielding layer 5, the second shielding layer 7, the third shielding layer 10 and the fourth shielding layer 14 are made of copper-plain carbon steel-copper composite tapes, and the manufacturing process comprises the steps of cleaning the composite surfaces of the copper tapes and the plain carbon steel tapes, superposing the copper tapes and the plain carbon steel tapes, heating the copper tapes and the plain carbon steel tapes by a heater, and rolling and bonding the copper tapes, the plain carbon steel-copper composite tapes and the plain carbon steel tapes. The shielding layer steel layer prepared by the method is beneficial to absorbing a magnetic field in an electromagnetic field, the copper layer is beneficial to absorbing the electric field, and the matching of the structure greatly improves the shielding property, the electric conductivity, the heat conduction property, the extensibility, the tensile strength and the shock resistance of the cable. Besides the advantages of copper and steel, the shielding layer has low manufacturing cost and is a high-quality and low-price product.

The outer sheath 17 is a halogen-free low-smoke flame-retardant outer sheath. The cable has temperature resistance, dampproofing waterproof performance to can protect inside cable core from external impact damage.

The production and manufacturing process of the cable comprises the following steps:

(1) drawing a copper rod into a copper conductor 3 meeting the process requirements by adopting a wire drawing and extrusion molding process, extruding and wrapping an inner insulating layer 4 outside the conductor 3, wrapping a first shielding layer 5 outside the inner insulating layer 4 by adopting a longitudinal wrapping process, wherein the width of the overlapping part of the longitudinal wrapping is not less than 6 mm; then, a physical foaming insulating layer 6 is extruded outside the first shielding layer 5 by adopting an extrusion molding process, a second shielding layer 7 is further coated outside the physical foaming insulating layer 6 by adopting a longitudinal coating process, and the width of the overlapping part of the longitudinal coating is not less than 6 mm; finally, an outer insulating layer 8 is extruded outside the second shielding layer 7, and the manufacturing of the insulating single wire 2 is completed;

(2) stranding 4 insulation single lines 2 into four line groups by a high-speed star strander, and then coating an inner non-hygroscopic insulating layer 9, a third shielding layer 10, a downstream drainage streamline 11 and an outer non-hygroscopic insulating layer 12 outside the four line groups by a longitudinal coating process, wherein the width of the overlapping part of the longitudinal coating is not less than 6 mm;

(3) and stranding the plurality of shielding four-wire groups 1 into a cable core by adopting a cabling and stranding process according to requirements, coating a cable core wrapping layer 13, then coating a fourth shielding layer 14 outside the cable core wrapping layer 13 by adopting an argon arc welding continuous welding process, and sequentially coating a polyethylene bonding protective layer 15, a double-steel-belt armor layer 16 and an outer sheath 17 outside the fourth shielding layer 14 to finish the manufacturing of the cable core and the cable core wrapping layer.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An internally shielded railway digital signal cable, comprising: the protective layer of the cable core consisting of at least one shielding wire group is provided with a copper-plain carbon steel-copper composite belt shielding layer; the protective layer of the shielding wire group formed by twisting a plurality of insulated single wires is provided with a copper-plain carbon steel-copper composite belt shielding layer; the insulating single wire is provided with a copper-plain carbon steel-copper composite belt shielding layer.

2. The internal shielding railway digital signal cable of claim 1, wherein the sheath of the cable core comprises a cable core belting layer, a fourth shielding layer, a polyethylene bonding sheath, a double-steel-tape armor layer and an outer sheath in sequence from inside to outside; wherein the fourth shielding layer is a copper-plain carbon steel-copper composite belt shielding layer.

3. The internally shielded railway digital signal cable of claim 2, wherein the fourth shield is a welded shield tube.

4. The internally shielded railway digital signal cable of claim 2, wherein the outer jacket is a halogen-free low-smoke flame-retardant outer jacket.

5. The internally shielded railway digital signal cable of claim 1, wherein the sheath of the shielding wire set is sequentially coated with an inner non-hygroscopic insulating layer, a third shielding layer and an outer non-hygroscopic insulating layer; the third shielding layer is a copper-plain carbon steel-copper composite belt shielding layer.

6. The internally shielded railway digital signal cable of claim 5, wherein the third shield layer is an embossed, longitudinally wrapped shield layer.

7. The internally shielded railway digital signal cable of claim 5, wherein at least one flow relief line is provided between the third shield layer and the outer non-hygroscopic insulating layer.

8. The internally shielded railway digital signal cable of claim 1, wherein the insulated single wire is composed of a conductor, an inner insulating layer, a first shielding layer, a physically foamed insulating layer, a second shielding layer and an outer insulating layer, wherein the first shielding layer and the second shielding layer are copper-plain carbon steel-copper composite tape shielding layers.

9. The internally shielded railway digital signal cable of claim 8, wherein the first and second shield layers are embossed, longitudinally wrapped shield layers.