CN216749364U

CN216749364U - Halogen-free wear-resistant torsion-resistant high-strength fire alarm cable

Info

Publication number: CN216749364U
Application number: CN202122548616.0U
Authority: CN
Inventors: 王爱琴; 金赛; 姬彦东; 温可; 任佰智; 金海文
Original assignee: Lanzhou Zhongbang Wire & Cable Group Co ltd
Current assignee: Lanzhou Zhongbang Wire & Cable Group Co ltd
Priority date: 2021-10-22
Filing date: 2021-10-22
Publication date: 2022-06-14
Anticipated expiration: 2031-10-22

Abstract

The utility model discloses a halogen-free wear-resistant, torsion-resistant and high-strength fire alarm cable which comprises a cable core, wherein a wrapping layer, a thin steel wire and copper wire braided shielding layer and a sheath layer are sequentially arranged outside the cable core; the cable core is formed by twisting a plurality of cable cores, a high-temperature flame-retardant filling rope is filled between the cable cores, and the conductor is formed by twisting a plurality of conductor monofilaments and a plurality of aramid fibers. According to the utility model, the high-strength aramid fiber wires are added into the conductor to enhance the strength of the conductor, the fluoroplastic with excellent performance is selected as cable insulation, the halogen-free polyurethane is selected as a cable sheath, the service life of the cable can be greatly prolonged, the thin steel wires and the copper wires are adopted for mixed weaving, the weaving structure can play a role in shielding, other interference currents are shielded, the thin steel wires and the copper wires can also be used as a reinforcing layer, the compression resistance of the cable is improved, the cable can be suitable for severe environments, the power supply line and the fire-fighting linkage control line of an automatic alarm system can be ensured to continue working in case of fire, the delayed combustion can not occur, and the guarantee is provided for people to escape and fight off fire.

Description

Halogen-free wear-resistant torsion-resistant high-strength fire alarm cable

Technical Field

The utility model belongs to the technical field of cables, and particularly relates to a halogen-free wear-resistant torsion-resistant high-strength fire alarm cable.

Background

At present, most fire alarm cables for fire fighting in the market are common cables with simple structure and general performance, but wind power generation systems are mostly in regions with severe weather conditions, generally in northern regions of China, have cold weather and large day-night temperature difference, and the cables are required to be frequently bent and twisted, so that the fire alarm cables with torsion resistance, high strength and weather resistance are required due to the phenomenon.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a fire alarm cable with excellent fatigue resistance, weather aging resistance, oil stain resistance, torsion resistance and bending performance.

The purpose of the utility model is realized by adopting the following technical scheme: a halogen-free wear-resistant torsion-resistant high-strength fire alarm cable comprises a cable core, wherein a wrapping layer, a fine steel wire and copper wire braided shielding layer and a sheath layer are sequentially arranged outside the cable core; the cable core is formed by twisting a plurality of wire cores, high-temperature flame-retardant filling ropes are filled among the wire cores, and each wire core comprises a conductor and an insulating layer coated outside the conductor; the conductor is formed by stranding a plurality of conductor monofilaments and a plurality of aramid filaments together, and the conductor monofilaments are soft copper conductors.

Preferably, the number of aramid filaments is 15% of the number of conductor filaments.

Preferably, the conductor monofilament adopts a 6 th soft copper conductor required by GB/T3956-.

Preferably, the sheathing layer is made of halogen-free flame-retardant thermoplastic polyurethane sheathing material.

Preferably, the insulating layer is made of fluoroplastic.

Preferably, the wrapping layer adopts a novel low-smoke halogen-free high-flame-retardant tape.

Preferably, the bundle twisting pitch of the conductor is 10-12 times.

Preferably, the cable core is cabled in the right direction, and the cabling pitch is 8-10 times of the stranding outer diameter.

According to the utility model, the high-strength aramid fiber wires are added into the conductor to enhance the strength of the conductor, the fluoroplastic with excellent performance is selected as cable insulation, the halogen-free polyurethane is selected as a cable sheath, the service life of the cable can be greatly prolonged, the thin steel wires and the copper wires are adopted for mixed weaving, the weaving structure can play a role in shielding, other interference currents are shielded, the thin steel wires and the copper wires can also be used as a reinforcing layer, the compression resistance of the cable is improved, the cable can be suitable for severe environments, the power supply line and the fire-fighting linkage control line of an automatic alarm system can be ensured to continue working in case of fire, the delayed combustion can not occur, and the guarantee is provided for people to escape and fight off fire.

Drawings

Fig. 1 is a schematic structural diagram of a halogen-free wear-resistant, torsion-resistant, high-strength fire alarm cable according to an embodiment of the present invention.

In the figure, 1: a conductor with aramid filaments; 2: an insulating layer; 3: filling; 4: wrapping a covering; 5: weaving a shielding layer by using thin steel wires and copper wires; 6: a sheath layer.

Detailed Description

As shown in figure 1, the utility model discloses a halogen-free wear-resistant torsion-resistant high-strength fire alarm cable.

1. Selection of materials

(1) Conductor 1: the conductor determines the flexibility of the cable to a great extent, so the design adopts a 6 th soft copper conductor required by GB/T3956-.

(2) Insulating layer 2: the fluoroplastic is extruded, so that the fluoroplastic has high flame retardance, high oxygen index, small flame diffusion range during combustion and less generated smoke; the electric performance is excellent, compared with polyethylene, the dielectric constant of the fluoroplastic is lower, so that compared with a coaxial cable with the same structure, the attenuation of the fluoroplastic insulation is smaller; the fluoroplastic has extraordinary thermal stability, so that the fluoroplastic cable can adapt to a high-temperature environment of 150-200 ℃, and common polyethylene and polyvinyl chloride cables are only suitable for a working environment of 70-90 ℃; in addition, the fluoroplastic cable has good dielectric strength and insulation resistance; the fluoroplastic has high chemical bond energy, high stability, almost no influence of temperature change, excellent weather aging resistance and excellent mechanical strength; and is not affected by various acids, alkalis and organic solvents, so that the paint is suitable for occasions with large environmental climate change, corrosiveness and the like.

(3) Cabling: and the flexibility of the cable can be increased by adopting small-pitch right-direction cabling.

(4) And (4) winding a covering: the novel low-smoke halogen-free high-flame-retardant belt is adopted, the oxygen index of the belt material is more than 50%, the flame-retardant performance is very high, the elongation rate is more than 15%, the winding is tight, the cable is not cracked, and the torsion-resistant performance of the cable is improved.

(5) The shielding layer 5: adopt thin steel wire and copper wire to mix to weave after the stranding, this structure of weaving can play the shielding effect, can regard as the enhancement layer again, improves cable resistance to compression tensile ability.

(6) Sheath layer 6: the sheath is extruded by adopting a flame-retardant halogen-free thermoplastic polyurethane sheath material, the polyurethane material has the soft wear-resistant performance of rubber, the processing technology is simple, the polyurethane material can be directly extruded by heating, the molecular structure of the polyurethane material is generally formed by embedding a soft chain segment and a rigid chain segment, and due to the existence of the two chain segments, the polyurethane material has the properties of higher tensile strength, better wear resistance, resistance to corrosion of various grease and solvents, resistance to electron radiation and the like, and the flame-retardant halogen-free thermoplastic polyurethane sheath material also has the characteristics of flame retardance, no halogen and the like.

2. Process scheme

(1) A conductor: the 6 th tinned soft copper conductor required by GB/T3956-.

(2) Insulating extrusion: the insulation selects fluoroplastic with high flame retardant property, the thickness of the insulation layer is used for checking the average thickness, the average thickness of the insulation layer is required to be not less than a nominal value, the thinnest point is not less than the nominal value multiplied by 90-0.1 mm, and the eccentricity is not more than 10%. The linear speed of the insulation extrusion is 80-120 m/min, and the extrusion temperature is 100-150 ℃. The cross section of the insulated wire core has no visible defects such as air bubbles, sand holes and the like, the surface of the wire core is smooth, has no obvious twisted line convex patterns, and has no sharp corners, particles, scorching or scratching traces.

(3) Cabling: the cable core is cabled in the right direction, the cabling pitch is 8-10 times of the outer diameter of the twisted cable, the cable core is round and compact, the defects of snake shape, kinking and the like cannot occur, the cable core cannot be damaged mechanically, the cable core is filled with the high-temperature flame-retardant filling rope in a round and round mode, and the out-of-round degree of the cable core cannot be larger than 10%.

(4) Shielding: after cabling, thin steel wires and copper wires are adopted for mixed weaving, the weaving surface is smooth, the phenomenon of wire breakage does not exist, joints must be trimmed and smooth, the phenomena of wire breakage, joints and the like occur when the steel wires are not equal, and the weaving density is not lower than 85%.

(5) Flame-retardant sheath layer: the sheath is made of a halogen-free flame-retardant thermoplastic polyurethane sheath material and is extruded in an extrusion pipe type mode, the extrusion temperature is 190-200 ℃, the brightness of the surface of the extruded polyurethane cable can be adjusted by adjusting the temperature of a die and a machine head, the thinnest point of the sheath is not less than the nominal value multiplied by 85-0.1 mm, the surface of the sheath is smooth and flat, sharp corners, pockmarks, scorching or scratching marks do not exist, and the cross section has no visible defects such as bubbles and sand holes.

The halogen-free wear-resistant torsion-resistant high-strength fire alarm cable can meet the requirements of wind power, wind power turbines and other fire alarm cables with severe use environments and high fire-fighting functions, once a fire breaks out, people can fight and escape for a certain time without being smoked by dense smoke, and precious rescue time is won. The structural design of adding the high-strength aramid fiber yarns into the conductor enhances the strength of the conductor, but does not have great influence on the weight of the conductor; the thin steel wires and the copper wires are mixed and woven, so that the shielding effect can be achieved, other interference currents can be shielded, the thin steel wires and the copper wires can serve as reinforcing layers, the compression resistance and tensile strength of the cable are improved, the fluoroplastic with excellent performance is selected as cable insulation, the halogen-free polyurethane serves as a cable sheath, the service life of the cable can be greatly prolonged, and halogen gas harmful to human bodies cannot be generated in case of fire.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the utility model. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a there is not steamed wear-resisting, antitorque type, high strength fire alarm cable which characterized in that: the cable comprises a cable core, and a wrapping layer, a thin steel wire and copper wire braided shielding layer and a sheath layer which are sequentially arranged outside the cable core; the cable core is formed by twisting a plurality of wire cores, a high-temperature flame-retardant filling rope is filled between the wire cores, and each wire core comprises a conductor and an insulating layer coated outside the conductor; the conductor is formed by stranding a plurality of conductor monofilaments and a plurality of aramid filaments together, and the conductor monofilaments are soft copper conductors.

2. The halogen-free, wear-resistant, torsion-resistant, high-strength fire alarm cable according to claim 1, wherein the number of aramid filaments is 15% of the number of conductor filaments.

3. The halogen-free wear-resistant, torsion-resistant and high-strength fire alarm cable as claimed in claim 1, wherein the conductor monofilament adopts a 6 th soft copper conductor required by GB/T3956 and 2008.

4. The halogen-free, abrasion-resistant, torsion-resistant, high-strength fire alarm cable of claim 1, wherein the sheathing layer is a halogen-free, flame-retardant thermoplastic polyurethane sheathing material.

5. The halogen-free, wear-resistant, torsion-resistant and high-strength fire alarm cable according to claim 1, wherein the wrapping layer is a low-smoke, halogen-free and high-flame-retardant tape.

6. The halogen-free, abrasion-resistant, torsion-resistant, high-strength fire alarm cable of claim 1, wherein the insulating layer is fluoroplastic.

7. The halogen-free wear-resistant, torsion-resistant and high-strength fire alarm cable according to claim 1, wherein the strand pitch of the conductor is 10-12 times.

8. The halogen-free wear-resistant, torsion-resistant and high-strength fire alarm cable according to claim 1, wherein the cable core is cabled in a right direction, and the cabling pitch is 8-10 times of the stranding outer diameter.