CN211087956U - Fireproof railway digital signal cable - Google Patents

Abstract

The utility model provides a fireproof railway digital signal cable, which comprises a cable core and a cable sheath outside the cable core; the cable core comprises at least one conductor group, each conductor group comprises a second fireproof layer and four insulated single wires which are twisted together, and a third fireproof layer is arranged in gaps among the four twisted insulated single wires; the cable sheath comprises a fourth fireproof layer, a heat insulation layer, a metal shielding layer, an inner liner, a fifth fireproof layer, a steel belt armor layer and an outer sheath layer from inside to outside in sequence. The utility model discloses a multiple fire prevention design makes the cable have characteristics such as coefficient of heat conductivity is low, temperature resistant fire behavior is strong, antifriction, corrosion-resistant and intensity height, satisfies the requirement of high-speed railway to the cable completely.

Description

Fireproof railway digital signal cable

Technical Field

The utility model belongs to the technical field of the cable, especially, relate to a fire prevention type railway digital signal cable.

Background

At present, under the social background of high-speed and stable development of economy, railway construction is expanded on a large scale, and simultaneously, higher requirements are also put forward on various devices required by the railway. The railway digital signal cable is used as ground equipment of a railway train control automatic device and an overspeed protection system, and control information, monitoring information and electric energy are transmitted between related signal equipment and a control device such as a microcomputer interlocking, a microcomputer monitoring system, a high-power electric switch machine and the like, and the functions of the cable are not the same, so that the cable plays an important role in ensuring the safety of trains and personnel.

The flame-retardant railway digital signal cable in the prior art is generally made of low-smoke low-halogen or halogen-free low-smoke flame-retardant materials, and is mainly characterized in that all the materials contain little or no halogen and the smoke quantity released during combustion is very small, however, the flame-retardant railway digital signal cable has a certain flame-retardant function, but has poor fire resistance, and once a fire disaster occurs, basically all the flame-retardant railway digital signal cable is burnt into ash to cause short circuit of lines in a short time, and the generated toxic gas forms a great obstacle to the evacuation escape of people and the safety performance of trains.

Disclosure of Invention

An object of the utility model is to provide a fire prevention type railway digital signal cable through multiple fire prevention design, makes cable thermal conductivity low, temperature resistant fire behavior is strong, antifriction, corrosion-resistant and intensity height.

In order to achieve the above object, the technical solution of the present invention is that:

a fireproof railway digital signal cable is characterized in that a first fireproof layer is coated outside an insulating single line; a second fireproof layer is arranged outside a wire group formed by twisting a plurality of insulated single wires; a third fire prevention layer is arranged in the gap of the twisted insulated single wires; and a double-layer fireproof layer is arranged in a cable sheath of the cable core consisting of at least one lead group.

Furthermore, the insulating single wire comprises a conductor and an insulating layer coated outside the conductor, and the first fireproof layer is made of fireproof paint and coated outside the insulating layer. The fireproof coating mainly comprises organic silicon non-combustible coating, lanthanum oxide and cerium oxide.

Furthermore, the second fireproof layer is a carbon fiber layer, and the carbon fiber layer is coated outside the third fireproof layer of the intertwisted insulated single wires and the gaps. The carbon fiber layer is prepared by taking acrylic fibers and viscose as raw materials and carrying out high-temperature oxidation and carbonization.

Furthermore, the third fire prevention layer is fire clay which is a mixture composed of fire-resistant fine aggregate and a hydraulic binder playing a main binding role.

Further, the cable sheath comprises a fourth fireproof layer, a heat insulation layer, a metal shielding layer, an inner liner, a fifth fireproof layer, a steel strip armor layer and an outer sheath layer from inside to outside in sequence, wherein the fourth fireproof layer and the fifth fireproof layer form the double-layer fireproof layer.

Furthermore, the fourth fireproof layer and the fifth fireproof layer are carbon fiber reinforced epoxy resin composite belts.

Furthermore, the outer sheath layer is a ceramic silicon rubber sheath.

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

1. in the utility model, the first fireproof layer of the cable is fireproof paint, the second fireproof layer is a carbon fiber layer, the third fireproof layer is fire clay, the fourth fireproof layer and the fifth fireproof layer are carbon fiber reinforced epoxy resin composite belts, and the cable has the characteristics of low heat conductivity coefficient, strong temperature resistance and fireproof performance, friction resistance, corrosion resistance, high strength and the like through multiple fireproof designs;

2. the utility model discloses insulating layer, metallic shield layer, inner liner, steel band armor and oversheath layer that set up make the cable have superior shielding property, mechanical strength height, sturdy and durable, and the cable can stand violent mechanical destruction, and shock resistance and anti-vibration excellent performance have still ensured simultaneously that the cable has functions such as superior temperature resistant, dampproofing, resistance to compression, preventing that the animal tooth stings, satisfies the requirement of high-speed railway to the cable completely.

Drawings

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

wherein:

1. insulating the single wire; 2. A conductor;

3. an insulating layer; 4. A first fire resistant layer;

5. a wire group; 6. A second fire-resistant layer;

7. a third fire prevention layer; 8. A fourth fire resistant layer;

9. a thermal insulation layer; 10. A metal shielding layer;

11. an inner liner layer; 12. A fifth fire resistant layer;

13. a steel tape armor layer; 14. An outer jacket layer.

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.

A fireproof railway digital signal cable, as shown in figure 1, comprises a cable core and a cable sheath outside the cable core; the cable core comprises at least one lead group 5, and each lead group 5 comprises a second fireproof layer 6 and four insulated single wires 1 which are twisted together inside the second fireproof layer; the insulated single wire 1 comprises a conductor 2 and an insulating layer 3 coated outside the conductor, and a first fireproof layer 4 is arranged outside the insulating layer 3; a third fire prevention layer 7 is arranged in gaps among the four stranded insulated single wires 1; the cable sheath comprises a fourth fireproof layer 8, a heat insulation layer 9, a metal shielding layer 10, an inner liner layer 11, a fifth fireproof layer 12, a steel belt armor layer 13 and an outer sheath layer 14 from inside to outside in sequence.

The first fireproof layer 4 is a fireproof coating which is composed of an organic silicon non-combustible coating, lanthanum oxide and cerium oxide, the prepared fireproof coating has the characteristics of high fire resistance, high temperature resistance and the like, the cable can be effectively prevented from further flame extension in fire occasions, the electrical properties of a conductor and an insulating layer are greatly protected, and the temperature resistance and fireproof performance of the cable are improved, wherein the organic silicon non-combustible coating is 85-90 parts by weight, the lanthanum oxide and the cerium oxide are 10-15 parts by weight, and the ratio of the lanthanum oxide to the cerium oxide is 1: 2-1: 3; preferably, 85 parts of the organic silicon non-combustible coating, 5 parts of lanthanum oxide and 10 parts of cerium oxide.

The second fireproof layer 6 is a carbon fiber layer, is formed by taking acrylic fibers and viscose as raw materials and carrying out high-temperature oxidation and carbonization, has excellent performances of high temperature resistance, friction resistance, corrosion resistance, permanent non-combustibility, low hygroscopicity, low heat conductivity coefficient and the like, and prolongs the service life of the cable.

The third fire prevention layer 7 is fire clay, is a mixture composed of fire-resistant fine aggregate and a hydraulic binder which plays a main binding role, and has the characteristics of simple production process, high fire-resistant temperature, good plasticity, convenient construction, strong corrosion resistance and the like.

The fourth fireproof layer 8 and the fifth fireproof layer 12 are carbon fiber reinforced epoxy resin composite belts, the thickness of the carbon fiber reinforced epoxy resin composite belts is not less than 0.25mm, and the double fireproof layers have the characteristics of high fire resistance and high temperature resistance, light specific gravity, high strength, small thermal expansion coefficient, corrosion resistance, fatigue resistance and the like.

The outer sheath layer 14 is a ceramic silicon rubber sheath. The ceramic silicon rubber sheath can be ablated in fire to form a hard protective layer, the protective layer can prevent flame from continuing to burn, and external flame is effectively isolated, so that a cable core in the ceramic silicon rubber fireproof layer is protected from being damaged, the longer the ablation time is, the higher the temperature is, the harder the shell is, and the requirements of a high-speed railway on the cable are completely met.

The metal shielding layer 10 is an aluminum sheath layer, a comprehensive sheath layer or a copper shielding layer. The cable has excellent shielding performance, and is not interfered by other external factors in the using process, so that the stability of signal transmission is ensured, transmission signals are not distorted and deformed, and the safety and reliability of the cable are improved.

The steel strip armor layer 13 is formed by wrapping double-layer galvanized steel strips with the thickness not less than 0.5mm in a leftward clearance mode, the double-steel strip armor layer is good in bending performance, high in mechanical strength, firm and durable, the cable can be subjected to severe mechanical damage, and the shock resistance and the anti-vibration performance are excellent.

Fireproof railway digital signal cable manufacturing process is:

firstly, drawing a conductor 2 of an insulated single wire 1 and manufacturing an insulating layer 3 by adopting a wire drawing and extrusion molding tandem production line, coating a first fireproof layer on the outer surface of the insulating layer 3 by adopting a coating process, twisting the 4 produced insulated single wires 1, arranging a third fireproof layer 7 and an externally-coated second fireproof layer 6 in gaps among the 4 twisted insulated single wires 1, and finishing manufacturing a lead 5 at one time;

and twisting the produced plurality of lead groups 5 together by using a high-speed cabling machine to prepare a cable core according to requirements, and then sequentially coating a fourth fireproof layer 8, a heat insulation layer 9, a metal shielding layer 10, an inner liner layer 11, a fifth fireproof layer 12, a steel belt armor layer 13 and an outer sheath layer 14 outside the cable core. In order to ensure that all electrical performance indexes of the cable are qualified, all the lead groups 5 in the cable core keep consistent tension in the production process, and the arrangement range of the stranding pitch of the insulated single wires 1 and the lead groups 5 is 35-55 times of the outer diameter of the cable core.

The utility model discloses a high fire prevention and high temperature resistance function are realized, cooperate completely through first flame retardant coating to fifth flame retardant coating and oversheath layer each other, oversheath layer 14 is as first defence line, its pottery silicon rubber sheath meets the fire and erodees the hard protective layer of one deck that forms, block the continuation burning of flame, can effectively completely cut off external flame, oversheath layer 14 inside fourth flame retardant coating 8 and fifth flame retardant coating 12 intensity height, the coefficient of thermal expansion is little, play high fire-resistant and high temperature resistance's effect, the carbon fiber layer of second flame retardant coating 6 and the fire clay of third flame retardant coating 7 all are fire-resistant high temperature resistant, further weaken the influence of fire and high temperature, the fire-proof coating that sets up at the insulating layer 3 of conductor, as the last defence line of the fire-resistant high temperature influence of fire, effectively prevent the delay of cable and burn, the electrical property of protection insulation single line.

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 (7)

1. A fireproof railway digital signal cable is characterized in that a first fireproof layer is coated outside an insulating single line; a second fireproof layer is arranged outside a wire group formed by twisting a plurality of insulated single wires; a third fire prevention layer is arranged in the gap of the twisted insulated single wires; and a double-layer fireproof layer is arranged in a cable sheath of the cable core consisting of at least one lead group.

2. The fire-proof railway digital signal cable according to claim 1, wherein the insulating single wire comprises a conductor and an insulating layer coated outside the conductor, and the first fire-proof layer is a fire-proof coating and is coated outside the insulating layer.

3. The fire-proof railway digital signal cable according to claim 1, wherein the second fire-proof layer is a carbon fiber layer, and the carbon fiber layer is coated outside the third fire-proof layer of the intertwisted insulated single wires and the gaps.

4. The fire-proof railway digital signal cable according to claim 1, wherein the third fire-proof layer is fire clay, and the fire clay is a mixture of fire-proof fine aggregate and a hydraulic binder which plays a main binding role.

5. The fire-proof railway digital signal cable according to claim 1, wherein the cable sheath comprises a fourth fire-proof layer, a thermal insulation layer, a metal shielding layer, an inner liner layer, a fifth fire-proof layer, a steel tape armor layer and an outer sheath layer in sequence from inside to outside, wherein the fourth fire-proof layer and the fifth fire-proof layer form the double-layer fire-proof layer.

6. The fire-proof railway digital signal cable according to claim 5, wherein the fourth fire-proof layer and the fifth fire-proof layer are carbon fiber reinforced epoxy resin composite tapes.

7. The fire-resistant railway digital signal cable according to claim 5, wherein the outer sheath layer is a ceramic silicon rubber sheath.

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