CN201667256U - New low-smoke, halogen-free, flame-retardant rail transit digital signal cable - Google Patents

Abstract

The utility model relates to a novel low-smoke, halogen-free, flame-retardant rail transit digital signal cable, which includes a conductor, an insulating layer, a shielding layer and a sheath, and is characterized in that: the outer surface of the conductor is provided with an insulating layer, The tape layer and the inner shielding layer are arranged in turn on the wire group of the conductor with the insulating layer to form a wire group cable, and the cable core formed by twisting several wire group cables is provided with a water blocking layer and an outer shielding layer in sequence. , Oxygen barrier layer, armor layer, sheath cracking layer and sheath layer. The advantages are: good shielding effect, strong signal transmission capability, long service life, good flame retardant, waterproof, and sunscreen performance.

Description

New low-smoke, halogen-free, flame-retardant rail transit digital signal cable

technical field

The utility model belongs to the technical field of communication cables, in particular to a novel low-smoke, halogen-free, flame-retardant rail transit digital signal cable. the

Background technique

At present, with the development of our country's economic construction and the continuous improvement of the degree of traffic informationization, the vigorous development of information technology and the wide application of electronic computers have become an important symbol of the modernization of rail transit. Communication cables are an important part of the rail transit signal system. With the rapid development of my country's rail transit, the environment for laying cables is becoming more and more diverse. As a result, the performance requirements of communication cables for rail transit are also continuously increasing. Now None of the digital signal cables in the prior art has waterproof and UV-resistant properties. Therefore, there is an urgent need to develop a digital signal cable for rail transit that is environmentally friendly, waterproof, flame-retardant, and has anti-ultraviolet properties. the

Contents of the invention

The utility model provides a novel low-smoke, halogen-free, flame-retardant rail transit digital signal cable that is environmentally friendly, waterproof, anti-ultraviolet, flame-retardant and has a long service life in order to solve the technical problems in the known technology. the

The technical solution adopted by the utility model to solve the technical problems existing in the known technology is: a new low-smoke, halogen-free, flame-retardant rail transit digital signal cable, including a conductor, an insulating layer, a shielding layer and a sheath, and is characterized in that: The outer surface of the conductor is provided with an insulating layer, and a tape layer and an inner shielding layer are sequentially arranged on the wire group of two conductors provided with an insulating layer to form a wire group cable, and several wire group cables are twisted together. The cable core is successively provided with a water blocking layer, an outer shielding layer, an oxygen barrier layer, an armor layer, a protective sheath cracking layer and a sheath layer. the

The utility model can also adopt the following technical solutions:

Fillers are provided in the gaps between the wire groups of the conductors provided with the insulating layer and in the gaps between the wire group cables. the

The inner shielding layer is braided with metal wires. the

The outer shielding layer is an aluminum-plastic composite tape. the

The insulation layer, the oxygen barrier layer and the sheath layer are all made of halogen-free polyolefin materials. the

There are 2-61 cables in the set of wires. the

The advantages and positive effects of the utility model are: because the utility model adopts the above-mentioned technical scheme, the cable includes two shielding layers, the inner shielding layer and the outer shielding layer, and the inner shielding layer is braided by metal wire, and the outer shielding layer is an aluminum-plastic composite tape. Not only increases the shielding effect, improves the ability of the cable to transmit digital signals, but also improves the water resistance of the cable; the insulating layer, oxygen barrier layer and sheath layer are all made of halogen-free polyolefin materials, in addition to enhancing the flame retardant ability of the cable , also makes the cable have the ability of anti-ultraviolet rays, which can effectively prevent the sheath of the cable from cracking due to exposure to the sun, prolong the service life of the cable, and have good environmental protection performance; there is a protective sleeve between the armored layer and the sheath layer to crack Layer, which can reduce the gap formed between the armor layer and the sheath layer, thereby reducing the internal shear stress of the sheath and preventing the sheath from cracking.

Description of drawings

Fig. 1 is a structural representation of the utility model. the

In the figure: 1. Conductor; 2. Insulation layer; 3. Filler; 4. Tape layer; 5. Inner shielding layer; 6. Water blocking layer; 7. Outer shielding layer; Armoring layer; 10, cracking layer of protective sleeve; 11, sheathing layer. the

Detailed ways

In order to further understand the invention content, characteristics and effects of the present utility model, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:

Please refer to Figure 1, a new type of low-smoke, halogen-free, flame-retardant rail transit digital signal cable, including a conductor 1 covered with an insulating layer 2 on the outer surface, and a wire group composed of two conductors 1 covered with an insulating layer 2 and After the filler 3 arranged in the gap of the wire group is twisted into a cable, it is fastened and fixed with the wrapping layer 4. The outer surface of the wrapping layer 4 is covered with an inner shielding layer 5 made of braided metal wires to form a wire group cable. The wire group cables and the fillers 3 arranged in the gaps between the wire group cables are stranded to form a cable core, and the wire group cables are 2-61. In this embodiment, there are 12 wire group cables, and the outer surfaces of the cable cores are coated with Water blocking tape layer 6, outer shielding layer 7, oxygen barrier layer 8, armor layer 9, protective sheath cracking layer 10 and sheath layer 11. In the above structure, the inner shielding layer 5 is braided by metal wires, and the outer shielding layer 7 is longitudinally wrapped with aluminum-plastic composite tape. In this embodiment, the inner shielding layer 5 is braided by copper wires, which can increase the shielding of the cable. effect, thereby improving the ability of the cable to transmit digital signals, and can also improve the water resistance of the cable; the materials of the insulating layer 2, the oxygen barrier layer 8 and the sheath layer 11 are all halogen-free polyolefin materials, and the flame retardancy and environmental protection performance of the cable Good, and it can prevent ultraviolet rays, which can effectively avoid the cracking of the sheath of the cable due to long-term exposure to the sun. the

Claims (6)

1. novel low-smoke non-halogen flame-retardant track traffic digital signal cable, comprise conductor, insulating barrier, screen and sheath, it is characterized in that: the outer surface of described conductor is provided with insulating barrier, on the line group of two conductors that are provided with insulating barrier, set gradually belting layer and internal shield, constitute line group cable with this, be provided with water blocking tape layer, outer shielding layer, oxygen barrier layer, armour, protective jacket cracking layer and restrictive coating on the stranded cable core that forms of several line group cables successively.

2. novel low-smoke non-halogen flame-retardant track traffic digital signal cable according to claim 1 is characterized in that: gap location between the line group of the described conductor that is provided with insulating barrier and the gap location between the line group cable are equipped with filler.

3. novel low-smoke non-halogen flame-retardant track traffic digital signal cable according to claim 1 is characterized in that: described internal shield adopts metal wire knitted to form.

4. novel low-smoke non-halogen flame-retardant track traffic digital signal cable according to claim 1, it is characterized in that: described outer shielding layer is an aluminium-plastic tape.

5. novel low-smoke non-halogen flame-retardant track traffic digital signal cable according to claim 1, it is characterized in that: described insulating barrier, oxygen barrier layer and restrictive coating are made by the halogen-free polyolefin material.

6. novel low-smoke non-halogen flame-retardant track traffic digital signal cable according to claim 1 is characterized in that: described line group cable is the 2-61 root.

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