CN217767893U - High-performance mining low-smoke halogen-free flame-retardant power cable - Google Patents
High-performance mining low-smoke halogen-free flame-retardant power cable Download PDFInfo
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Abstract
The utility model provides a mining low smoke and zero halogen flame retardant power cable of high performance, the structure of cable includes cable core and the sheath structure of parcel outside the cable core. The sheath structure comprises an armor layer, an outer winding covering layer and an outer sheath layer from inside to outside, wherein the armor layer is covered outside the cable core; the armor layer is formed by wrapping a plurality of metal wires; the outer wrapping layer is formed by overlapping and wrapping two layers of non-hygroscopic strips; the outer sheath layer is formed by extruding and wrapping high-tensile strength, high-elongation at break and high-flame-retardant low-smoke halogen-free polyolefin sheath material; the cable core is formed by twisting a plurality of wire cores and filling materials; the structure of the wire core is that a conductor, a conductor shielding layer, an insulating shielding layer and a metal shielding layer are arranged from inside to outside in sequence; the conductor is a copper conductor, and the copper conductor is formed by twisting bare copper monofilaments; the conductor shielding layer and the insulation shielding layer are both formed by environment-friendly peroxide cross-linked semi-conductive shielding materials; the insulating layer is made of cross-linked polyethylene environment-friendly insulating material; the metal shielding layer is formed by soft copper tapes which are lapped and lapped.
Description
Technical Field
The technical scheme belongs to the technical field of cables, and particularly relates to a high-performance mining low-smoke halogen-free flame-retardant power cable.
Background
As mineral resources are continuously developed, it is difficult for conventional power cables produced according to MT818 released by the national safety production supervision and administration bureau to meet the actual working condition requirements of the site.
When a fire disaster occurs, hydrogen chloride, carbon monoxide, benzene ring-containing compounds and carbon smoke dust generated by the combustion of the PVC sheath have great potential safety hazards for rescued people trapped under a mine. And facing a vertical shaft or a roadway with an inclination angle of 45 degrees or more, the cable installation and laying can also have serious influence on the cable life product.
For the problems generated by the combustion of the PVC sheath, the sheath can be made of halogen-free, low-smoke and flame-retardant sheath materials. However, the following problems are found in the process of development, trial production and trial use: in order to ensure that the flame retardant performance requirement is successfully met and a bundled combustion test is passed, excessive flame retardant needs to be added into the sheath material, which inevitably affects other properties of the sheath. In order to ensure the feasibility of the scheme and balance the performances, the cable structure needs to be redesigned and adjusted.
For the problem of shortening the service life of a cable caused by laying the cable in a vertical shaft or a roadway with an inclination angle of 45 degrees or more, after the cable is laid, the cable is influenced by stretching in the long-term operation process, and the outer sheath has a cracking risk, so that the cable sheath loses the protection significance, and the mechanical property and the cracking resistance of the sheath need to be improved emphatically.
Disclosure of Invention
The technical scheme is invented and innovated mainly on the premise of MT818 basic performance requirements, and the difficulty is mainly to design a new structure for the mining power cable and better apply the low-smoke halogen-free flame-retardant sheath material, so that the cable can meet various performance requirements.
The technical scheme is that the high-performance mining low-smoke halogen-free flame-retardant power cable has an outer diameter of 60-100 mm. The cable has the advantages that the cable has specific requirements on the outer diameter aiming at the requirements of a mining scene, and the structure is specially adopted for ensuring the basic functions/performances of the cable under the outer diameter so that the cable has the characteristics of excellent mechanical performance, high tensile strength, large elongation at break and the like, and the whole cable has high flame retardance, low smoke and zero halogen.
The cable comprises a cable core and a sheath structure wrapped outside the cable core.
The sheath structure comprises an armor layer, an outer winding covering layer and an outer sheath layer from inside to outside, wherein the armor layer is covered outside the cable core;
the armor layer is formed by wrapping a plurality of metal wires, the pitch diameter ratio of the metal wire wrapping is 8-12 times, the total gap of the metal wire armor is less than 1 time of the outer diameter of the metal wire, and the diameter of the metal wire is 4.0-6.0 mm;
the outer wrapping layer is formed by overlapping and wrapping two layers of non-hygroscopic strips, and the wrapping and covering rate ranges from 20% to 30%;
the outer sheath layer is formed by extruding and wrapping a high-tensile-strength, high-elongation-at-break and high-flame-retardant low-smoke halogen-free polyolefin sheath material, the thickness range of the outer sheath layer is 2.0-3.9 mm in nominal thickness, and the thinnest point thickness is not less than 90% of the nominal value;
the cable core is formed by twisting a plurality of wire cores and filling materials, and the cabling pitch-diameter ratio of the cable core is 25-35 times;
the structure of the wire core is as follows: the cable comprises a conductor, a conductor shielding layer, an insulating shielding layer and a metal shielding layer from inside to outside in sequence;
the conductor is a copper conductor, the copper conductor is formed by twisting bare copper monofilaments, the twisting pitch diameter ratio range of each layer of monofilament is controlled to be 20-40 times, and the diameter range of the bare copper monofilaments is 2.20-3.50 mm; the diameter range of the conductor is 8.0 mm-25.0 mm;
the conductor shielding layer and the insulation shielding layer are both made of environment-friendly peroxide cross-linked semi-conductive shielding materials; the thickness range of the conductor shielding layer is 0.8-1.0 mm, and the thickness range of the insulation shielding layer is 1.0-1.2 mm;
the insulating layer is made of cross-linked polyethylene environment-friendly insulating material; the thickness range of the insulating layer is 4.5-4.8 mm;
the metal shielding layer is formed by soft copper tapes which are lapped and lapped in an overlapping mode; the thickness of the soft copper strip is not less than 0.10mm, the average covering rate of the overlapped wrapping is not less than 15%, and the minimum covering rate is not less than 5%.
The further improvement is that: the sheath structure also comprises an inner wrapping layer and an inner sheath layer; the cable core is externally provided with an internal wrapping layer, the external of the internal wrapping layer is provided with an inner sheath layer, and the external of the inner sheath layer is provided with an armor layer;
the inner wrapping layer is formed by overlapping and wrapping two layers of non-hygroscopic strips, and the wrapping and covering rate ranges from 20% to 30%;
the inner sheath layer is formed by extruding and wrapping low-smoke halogen-free flame-retardant polyolefin materials; the nominal thickness of the inner sheath layer ranges from 2.8mm to 3.0mm, and the thinnest point thickness is not less than 90% of the nominal value.
Preferably: the filling is a non-hygroscopic polypropylene web tear fiber.
According to the cable structure, on the premise of ensuring the basic functions/performances of the cable, the low-smoke halogen-free flame-retardant sheath material is used, so that the cable has the characteristics of excellent mechanical performance, high tensile strength, large breaking elongation and the like, and the whole cable has high flame retardancy and low-smoke halogen-free performance.
The armor is comprised of wire. The metal wire is a galvanized steel wire, and the longitudinal tensile resistance of the cable is effectively ensured by the metal wire.
The sheath material of the outer sheath layer is a low-smoke halogen-free flame-retardant polyolefin material, so that the cable can prevent flame from spreading in case of fire, has less smoke and no halogen gas release, and the outer sheath material is adaptive to the operating temperature of the cable.
This cable:
the specific thickness of the outer sheath layer enables the sheath material to have the characteristics of excellent mechanical property, high tensile strength, large elongation at break and the like after being used for cables, and in addition, the cable has high flame retardance and low smoke and zero halogen performance due to the performance characteristics of the sheath material.
The cable core is made of a copper conductor, an environment-friendly peroxide cross-linked semi-conductive shielding material and a cross-linked polyethylene insulating material; the conductor electric field is homogenized. Meanwhile, the metal shielding layer is lapped outside the wire core in an overlapping mode, and electromagnetic field interference generated by the outside is reduced. The conductor of the cable adopts a multi-layer compact structure, so that the outer diameter of the conductor is reduced; the insulation thickness is uniform, and the eccentricity can be ensured not to be more than 5%; the metal shielding has excellent electrical performance, small partial discharge and long-term reliable electrical guarantee, well ensures the important electrical performance index of the cable body, and meets the requirements of long-term, reliable and safe operation of the cable.
The inner wrapping layer adopts a high-quality flame-retardant tape, so that a cable core made by twisting is prevented from loosening, and the flame-retardant performance of the cable is improved to a certain extent;
the inner sheath layer is made of low-smoke halogen-free polyolefin by extrusion coating, and plays a role in isolating the metal shielding layer from the armor layer;
the armor layer is armored by thick and thick steel wires, so that the tensile strength of the whole cable is improved;
the outer wrapping layer adopts a high-quality flame-retardant belt, so that the steel wires can be prevented from loosening, the flame-retardant performance of the cable is improved, and flame can be prevented from spreading on the cable;
the outer sheath layer with a specific thickness is formed by extruding a low-smoke halogen-free flame-retardant polyolefin material, so that the cable can meet complex mine environments, the service life of the cable in the field of mining can be prolonged, and secondary damage accidents caused by disasters can be avoided as far as possible.
The beneficial effects of the invention are as follows: the cable improves the mechanical property of the outer sheath, is suitable for complex mine environments, and prolongs the service life of the cable; the mechanical property of the outer sheath layer is improved, and the phenomenon that the cable loses the protection effect due to the breakage of the sheath is avoided; promote cable fire behavior, prevent to lead to cable whole burnout because of the conflagration. The basic function of the cable is ensured to be normal, and the outer sheath layer of the low-smoke halogen-free flame-retardant polyolefin material can also prevent secondary damage accidents caused by disasters.
Based on the characteristics, the cable can be applied to a vertical shaft or a roadway with an inclination angle of 45 degrees or more, and meets the requirements of electrical construction cables under coal mines and non-coal mines.
Drawings
Figure 1 is a schematic radial cross-section of the cable of this embodiment,
in the figure: 1. a conductor; 2. a conductor shield layer; 3. an insulating layer; 4. an insulating shield layer; 5. a metal shielding layer; 6. a filler material; 7. an inner wrapping layer; 8. an inner jacket layer; 9. an armor layer; 10. an outer wrap cladding; 11. an outer jacket layer.
Detailed Description
The technical solution is further described below with reference to specific examples as follows:
referring to fig. 1, the external diameter range of a high-performance mining low-smoke halogen-free flame-retardant power cable is 60-100 mm, the structure of the cable comprises a cable core and a sheath structure wrapped outside the cable core, and the high-performance mining low-smoke halogen-free flame-retardant power cable is characterized in that:
the sheath structure comprises an armor layer 9, an outer winding cladding layer 10 and an outer sheath layer 11 from inside to outside, wherein the armor layer 9 is wrapped outside the cable core;
the armor layer 9 is formed by a plurality of metal wire lapping packages, the pitch diameter ratio of the metal wire lapping packages is 8-12 times, the total gap of the metal wire armor is smaller than 1 time of the outer diameter of the metal wire, and the diameter of the metal wire is 4.0-6.0 mm;
the outer wrapping layer 10 is formed by overlapping and wrapping two layers of non-hygroscopic strips, and the wrapping coverage rate ranges from 20% to 30%;
the outer sheath layer 11 is formed by extruding and wrapping high-tensile-strength, high-elongation-at-break and high-flame-retardant low-smoke halogen-free polyolefin sheath materials (the materials can be HW4612-2 low-smoke halogen-free flame-retardant fuel produced by a special cable material factory in Asian east of Linhai city), the thickness range of the outer sheath layer is 2.0-3.9 mm in nominal thickness, and the thickness of the thinnest point is not less than 90% of the nominal value;
the cable core is formed by twisting a plurality of wire cores and a filling material 6, and the cabling pitch-diameter ratio of the cable core is 25-35 times;
the structure of the wire core is as follows: the cable comprises a conductor 1, a conductor shielding layer 2, an insulating layer 3, an insulating shielding layer 4 and a metal shielding layer 5 from inside to outside in sequence;
the conductor is a copper conductor, the copper conductor is formed by twisting bare copper monofilaments, the twisting pitch diameter ratio range of each layer of monofilament is controlled to be 20-40 times, and the diameter range of the bare copper monofilaments is 2.20-3.50 mm; the diameter range of the conductor is 8.0 mm-25.0 mm;
the conductor shielding layer and the insulation shielding layer are both made of environment-friendly peroxide cross-linking type semiconductive shielding materials (in the example, HFDA-0587BK and HFDA-0693BK peroxide cross-linking type semiconductive shielding materials of Dow chemical company can be used as the materials respectively); the thickness range of the conductor shielding layer is 0.8-1.0 mm, and the thickness range of the insulation shielding layer is 1.0-1.2 mm;
the insulating layer is made of cross-linked polyethylene environment-friendly insulating material (in the example, the material can be HFDB-4201 peroxide cross-linked polyethylene insulating material of Dow chemical company); the thickness range of the insulating layer is 4.5-4.8 mm;
the metal shielding layer is formed by soft copper tapes which are lapped and lapped in an overlapping mode; the thickness of the soft copper strip is not less than 0.10mm, the average covering rate of the overlapped wrapping is not less than 15%, and the minimum covering rate is not less than 5%.
In this example, the sheath structure further comprises an inner wrapping layer 7 and an inner sheath layer 8; an inner wrapping layer 7 is arranged outside the cable core, an inner sheath layer 8 is arranged outside the inner wrapping layer 7, and an armor layer 9 is arranged outside the inner sheath layer 8;
the inner wrapping layer is formed by overlapping and wrapping two layers of non-hygroscopic strips, and the wrapping and covering rate ranges from 20% to 30%;
the inner sheath layer is formed by extruding a low-smoke halogen-free flame-retardant polyolefin material (in the example, the material is HW495 (B1) low-smoke halogen-free flame-retardant fuel of a special cable material factory in Asia east of Linhai city); the nominal thickness of the inner sheath layer ranges from 2.8mm to 3.0mm, and the thinnest point thickness is not less than 90% of the nominal value.
The present embodiment preferably: the filling is a non-hygroscopic polypropylene web tear fiber. The non-hygroscopic polypropylene reticular tear fiber is required to be aged for 240 hours at the temperature of 100 +/-2 ℃ without embrittlement phenomenon.
The following description will further illustrate the application of the cable structure to an 8.7/10kV power cable:
the cable core is composed of 3 wire cores, and the cabling pitch-diameter ratio of the cable core is 25 times; the cross-sectional area of the conductor is 295mm 2 (ii) a The stranding pitch diameter ratio of the bare copper monofilament in the conductor is 28 times;
the thickness of the conductor shielding layer is 0.8mm; the thickness of the insulating shielding layer is 1.0mm; the thickness of the insulating layer was 4.5mm.
To the structure of sinle silk + armor + outer covering + oversheath layer:
the armor layer is formed by wrapping a plurality of metal wires, the pitch diameter ratio of the metal wire wrapping is 8, and the total gap of the metal wire armor is smaller than 1 time of the outer diameter of the metal wire; the diameter of the wire is 6.0mm;
the outer wrapping layer is formed by winding a low-smoke halogen-free flame-retardant belt; the thickness of the low-smoke halogen-free flame-retardant tape is 0.2mm, the width of the low-smoke halogen-free flame-retardant tape is 65mm, and the lapping cover width of the two layers of low-smoke halogen-free flame-retardant tapes is 5-8 mm; the oxygen index of the low-smoke halogen-free flame-retardant belt is more than 70%;
the nominal thickness of the outer jacket layer is 3.8mm.
To the structure of sinle silk + interior around covering + inner sheath layer + armor + outer covering + oversheath layer:
the inner wrapping layer is formed by wrapping a low-smoke halogen-free flame-retardant belt; the thickness of the low-smoke halogen-free flame-retardant belt is 0.2mm, the width of the low-smoke halogen-free flame-retardant belt is 65mm, and the width of the lapping cover of the two layers of low-smoke halogen-free flame-retardant belts is 5-8 mm; the oxygen index of the low-smoke halogen-free flame-retardant belt is more than 70 percent. In the prior art, the low-smoke halogen-free flame-retardant tape is formed by using a glass fiber tape as a base material, impregnating flame-retardant glue without any halogen, and curing.
The nominal thickness of the inner jacket layer is 2.8mm;
the armor layer is formed by wrapping a plurality of metal wires, the pitch diameter ratio of the metal wire wrapping is 12 times, and the total gap of the metal wire armor is smaller than 1 time of the outer diameter of the metal wire; the diameter of the wire is 4.0mm;
the outer winding cladding is formed by winding low-smoke halogen-free flame-retardant belts; the thickness of the low-smoke halogen-free flame-retardant tape is 0.2mm, the width of the low-smoke halogen-free flame-retardant tape is 65mm, and the lapping cover width of the two layers of low-smoke halogen-free flame-retardant tapes is 5-8 mm; the oxygen index of the low-smoke halogen-free flame-retardant belt is more than 70%;
the nominal thickness of the outer jacket layer is 3.0mm;
the overall outer diameter of the cable is 95.0 +/-2 mm.
In the above two structures, the metal wire of the armor layer is a galvanized steel wire, and the tensile strength of the galvanized steel wire is not less than 400N/mm 2 The elongation is not less than 15 percent, the torsion test frequency is not less than 15, and the weight of the armor layer is not less than 270g/m 2 。
The structure of the cable core, the inner wrapping layer, the inner sheath layer, the armor layer, the outer wrapping layer and the outer sheath layer is detected, and the performance of the cable comprises the following steps:
(1) Rated system voltage Uo/U:8.7/10kV, maximum working voltage Um:12kV;
(2) The conductor allows long-term working temperature when the cable normally runs as follows: at 90 ℃;
(3) In the case of short circuits (maximum duration of not more than 5 seconds), the maximum temperature allowed for the cable conductor is 250 ℃.
(4) Partial discharge test indexes: 1.73U0 voltage, no detectable discharge produced by the tested cable that exceeds the declared test sensitivity (declared test sensitivity less than 5pC, better than 10pC specified by national standards);
(5) Insulating structure size: the eccentricity (tmax-tmin)/tmax is less than or equal to 5 percent, and tmin is more than or equal to 0.95tn (tn is the nominal thickness, the minimum thickness and the maximum thickness of any same section of tmin and tmax) (the eccentricity is better than the requirement of less than or equal to 15 percent specified by national standard);
(6) Power frequency withstand voltage test: applying 3.5Uo (30.5 kV) voltage for 5min to prevent insulation breakdown;
(7) Insulating thermal extension test: the maximum elongation under load is less than or equal to 100 percent (which is better than the requirement of less than or equal to 175 percent specified by national standard), and the permanent elongation after cooling is less than or equal to 5 percent (which is better than the requirement of less than or equal to 15 percent specified by national standard);
(9) Insulating micropore and impurity test: the ultra-clean XLPE insulating material, an advanced frictionless gravity feeding system and a high-grade insulating and purifying system (100-grade insulating and feeding room) are adopted to control the sizes of insulating impurities and micropores to be optimal and obviously higher than the standard requirement of GB/T22078;
micropores greater than 0.05 mm: is composed of
0.025mm to 0.05mm of micropores: less than or equal to 18 pieces/10 cm 3
Opaque impurities greater than 0.125 mm: is composed of
Opaque impurities with the diameter of 0.05mm to 0.125mm are less than or equal to 6 per 10cm 3
Translucency greater than 0.16 mm: is composed of
(10) Mechanical properties of the outer sheath before aging: the tensile strength is more than or equal to 15MPa, and the elongation at break is more than or equal to 250 percent. After aging test (test temperature 100 ℃,240 h), the change rate of the tensile strength and the elongation at break is less than or equal to +/-25 percent.
Claims (7)
1. The utility model provides a mining fire-retardant power cable of low smoke and zero halogen of high performance, the external diameter scope of cable is 60 ~ 100mm, and the structure of cable includes cable core and the sheath structure of parcel outside the cable core, its characterized in that:
the sheath structure comprises an armor layer, an outer winding covering layer and an outer sheath layer from inside to outside, wherein the armor layer is covered outside the cable core;
the armor layer is formed by wrapping a plurality of metal wires, the pitch diameter ratio of the metal wire wrapping is 8-12 times, the total gap of the metal wire armor is less than 1 time of the outer diameter of the metal wire, and the diameter of the metal wire is 4.0-6.0 mm;
the outer wrapping layer is formed by overlapping and wrapping two layers of non-hygroscopic strips, and the wrapping and covering rate ranges from 20% to 30%;
the outer sheath layer is formed by extruding and wrapping high-tensile-strength, high-elongation-at-break, high-flame-retardant low-smoke halogen-free polyolefin sheath material, the thickness range of the outer sheath layer is 2.0-3.9 mm in nominal thickness, and the thickness of the thinnest point is not less than 90% of the nominal value;
the cable core is formed by twisting a plurality of wire cores and filling materials, and the cabling pitch-diameter ratio of the cable core is 25-35 times;
the structure of the wire core is as follows: the conductor, the conductor shielding layer, the insulating shielding layer and the metal shielding layer are arranged from inside to outside in sequence;
the conductor is a copper conductor, the copper conductor is formed by twisting bare copper monofilaments, the twisting pitch diameter ratio range of each layer of monofilament is controlled to be 20-40 times, and the diameter range of the bare copper monofilaments is 2.20-3.50 mm; the diameter range of the conductor is 8.0 mm-25.0 mm;
the conductor shielding layer and the insulation shielding layer are both formed by environment-friendly peroxide cross-linked semi-conductive shielding materials; the thickness range of the conductor shielding layer is 0.8-1.0 mm, and the thickness range of the insulation shielding layer is 1.0-1.2 mm;
the insulating layer is made of cross-linked polyethylene environment-friendly insulating material; the thickness range of the insulating layer is 4.5-4.8 mm;
the metal shielding layer is formed by soft copper tapes which are lapped and lapped in an overlapping mode; the thickness of the soft copper strip is not less than 0.10mm, the average lapping rate of the overlapped lapping is not less than 15%, and the minimum lapping rate is not less than 5%.
2. The high-performance mining low-smoke halogen-free flame-retardant power cable according to claim 1, characterized in that the sheath structure further comprises an inner wrapping layer and an inner sheath layer; the cable core is externally provided with an internal wrapping layer, the internal wrapping layer is externally provided with an inner sheath layer, and the inner sheath layer is externally provided with an armor layer;
the inner wrapping layer is formed by overlapping and wrapping two layers of non-hygroscopic strips, and the wrapping and covering rate ranges from 20% to 30%;
the inner sheath layer is formed by extruding and wrapping low-smoke halogen-free flame-retardant polyolefin material; the nominal thickness of the inner sheath layer ranges from 2.8 to 3.0mm, and the thinnest point thickness is not less than 90% of the nominal value.
3. The high performance mining low smoke, zero halogen, flame retardant power cable of claim 1 or 2, characterized in that the filler is non hygroscopic polypropylene mesh tear fiber.
4. The high-performance mining low-smoke halogen-free flame-retardant power cable according to claim 1 or 2, characterized in that the cable core is composed of 3 wire cores, and the cabling pitch-diameter ratio of the cable core is 25 times; the cross-sectional area of the conductor is 295mm 2 (ii) a The stranding pitch diameter ratio of the bare copper monofilament in the conductor is 28 times;
the thickness of the conductor shielding layer is 0.8mm; the thickness of the insulating shielding layer is 1.0mm; the thickness of the insulating layer was 4.5mm.
5. The high-performance low-smoke halogen-free flame-retardant power cable for mining according to claim 4, wherein the cable is characterized in that
The armor layer is formed by wrapping a plurality of metal wires, the pitch diameter ratio of the metal wire wrapping is 8, and the total gap of the metal wire armor is smaller than 1 time of the outer diameter of the metal wire; the diameter of the wire is 6.0mm;
the outer wrapping layer is formed by winding a low-smoke halogen-free flame-retardant belt; the thickness of the low-smoke halogen-free flame-retardant tape is 0.2mm, the width of the low-smoke halogen-free flame-retardant tape is 65mm, and the lapping cover width of the two layers of low-smoke halogen-free flame-retardant tapes is 5-8 mm; the oxygen index of the low-smoke halogen-free flame-retardant belt is more than 70%;
the nominal thickness of the outer jacket layer is 3.8mm.
6. The high-performance mining low-smoke halogen-free flame-retardant power cable according to claim 4, characterized in that
The inner wrapping layer is formed by wrapping a low-smoke halogen-free flame-retardant tape; the thickness of the low-smoke halogen-free flame-retardant belt is 0.2mm, the width of the low-smoke halogen-free flame-retardant belt is 65mm, and the width of the lapping cover of the two layers of low-smoke halogen-free flame-retardant belts is 5-8 mm; the oxygen index of the low-smoke halogen-free flame-retardant belt is more than 70%;
the nominal thickness of the inner jacket layer is 2.8mm;
the armor layer is formed by wrapping a plurality of metal wires, the pitch diameter ratio of the metal wire wrapping is 12 times, and the total gap of the metal wire armor is smaller than 1 time of the outer diameter of the metal wire; the diameter of the wire is 4.0mm;
the outer winding cladding is formed by winding low-smoke halogen-free flame-retardant belts; the thickness of the low-smoke halogen-free flame-retardant belt is 0.2mm, the width of the low-smoke halogen-free flame-retardant belt is 65mm, and the width of the lapping cover of the two layers of low-smoke halogen-free flame-retardant belts is 5-8 mm; the oxygen index of the low-smoke halogen-free flame-retardant belt is more than 70%;
the nominal thickness of the outer jacket layer is 3.0mm;
the overall outer diameter of the cable is 95.0 +/-2 mm.
7. The high performance mining low smoke zero halogen flame retardant power cable of claim 4, characterized in that the metal wire of the armor layer is galvanized steel wire, its tensile strength is not less than 400N/mm 2 The elongation is not less than 15 percent, the torsion test frequency is not less than 15, and the weight of the armor layer is not less than 270g/m 2 。
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| CN202221075502.7U CN217767893U (en) | 2022-05-07 | 2022-05-07 | High-performance mining low-smoke halogen-free flame-retardant power cable |
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| CN202221075502.7U CN217767893U (en) | 2022-05-07 | 2022-05-07 | High-performance mining low-smoke halogen-free flame-retardant power cable |
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| GR01 | Patent grant |