CN116487119A - Safe fire-proof cable for port returning and manufacturing method thereof - Google Patents
Safe fire-proof cable for port returning and manufacturing method thereof Download PDFInfo
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- CN116487119A CN116487119A CN202310368045.3A CN202310368045A CN116487119A CN 116487119 A CN116487119 A CN 116487119A CN 202310368045 A CN202310368045 A CN 202310368045A CN 116487119 A CN116487119 A CN 116487119A
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- mica tape
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 239000010445 mica Substances 0.000 claims abstract description 51
- 229910052618 mica group Inorganic materials 0.000 claims abstract description 51
- 239000004020 conductor Substances 0.000 claims abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 30
- 239000010410 layer Substances 0.000 claims abstract description 29
- 239000002356 single layer Substances 0.000 claims abstract description 17
- 239000003063 flame retardant Substances 0.000 claims abstract description 9
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000001125 extrusion Methods 0.000 claims description 35
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 22
- 238000009413 insulation Methods 0.000 claims description 22
- 238000009954 braiding Methods 0.000 claims description 14
- 229920003020 cross-linked polyethylene Polymers 0.000 claims description 11
- 239000004703 cross-linked polyethylene Substances 0.000 claims description 11
- 229910052802 copper Inorganic materials 0.000 claims description 10
- 239000010949 copper Substances 0.000 claims description 10
- 229920000098 polyolefin Polymers 0.000 claims description 8
- 239000003963 antioxidant agent Substances 0.000 claims description 4
- 230000003078 antioxidant effect Effects 0.000 claims description 4
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 238000005491 wire drawing Methods 0.000 claims description 3
- DXZMANYCMVCPIM-UHFFFAOYSA-L zinc;diethylphosphinate Chemical compound [Zn+2].CCP([O-])(=O)CC.CCP([O-])(=O)CC DXZMANYCMVCPIM-UHFFFAOYSA-L 0.000 claims description 2
- 238000012360 testing method Methods 0.000 abstract description 17
- 230000009970 fire resistant effect Effects 0.000 abstract description 9
- 239000000463 material Substances 0.000 abstract description 5
- 239000000779 smoke Substances 0.000 abstract description 2
- 230000032683 aging Effects 0.000 description 28
- 239000000047 product Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 5
- 238000004132 cross linking Methods 0.000 description 4
- 230000000704 physical effect Effects 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 101100477512 Schizosaccharomyces pombe (strain 972 / ATCC 24843) shf1 gene Proteins 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 238000007373 indentation Methods 0.000 description 2
- 238000009940 knitting Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000003679 aging effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000003064 anti-oxidating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 description 1
- 239000012964 benzotriazole Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 238000010382 chemical cross-linking Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 238000005502 peroxidation Methods 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/10—Insulating conductors or cables by longitudinal lapping
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/14—Insulating conductors or cables by extrusion
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
- H01B13/26—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping
- H01B13/2613—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping by longitudinal lapping
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/02—Disposition of insulation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
Abstract
The invention discloses a safe return fireproof cable and a manufacturing method thereof, and relates to the field of cable manufacturing, wherein the safe return fireproof cable comprises a conductor wire core and a calcined fireproof mica tape wound outside the conductor wire core, wherein the mica tape is wound with at least three layers, and the twisting pitch ratio of the mica tape is 20-30 times of the twisting outer diameter of the conductor wire core; the coverage rate of the left-hand wrapped single-layer mica tape of the conductor is 100%, the coverage rate of the right-hand overlapped wrapped single-layer mica tape after the single-layer wrapping is 100%, and the coverage rate of the left-hand wrapped single-layer mica tape after the double-layer mica tape is wrapped is 100%. The invention provides a cable fire-resistant mica layer structure, a material and a production process by improving the structure, the material and the production process, which are reasonable in structure, advanced in process and easy to produce and manufacture. The low-smoke halogen-free bundled flame-retardant fireproof spray-proof performance is realized, the requirements of fire supply and splash tests under specific conditions of standard requirements and the normal working state of equipment can be continuously ensured are met, and the safe harbor returning requirements of luxury cruise ships and passenger ships are met.
Description
Technical Field
The invention relates to the field of cable manufacturing, in particular to a safe fire-proof cable for a port-returning and a manufacturing method thereof.
Background
The fire-resistant water-spraying-resistant performance of the cable is a key index for safe harbor return, the current marine fire-resistant cable can only meet the condition that short circuit does not occur in a short time when a fire disaster occurs, but the current marine fire-resistant cable does not have a system which still has to be kept available when water enters a local area for safe evacuation, so that the maximum safe evacuation time meeting the requirement of 180min of safe evacuation is realized, the cable sleeve is required to be relied for protection, the weight and the cost of the whole ship body are increased, and the sailing speed is influenced.
Disclosure of Invention
The invention aims to provide a safe return fireproof cable and a manufacturing method thereof, which are used for solving the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme: the manufacturing method of the safe return fireproof cable comprises a conductor wire core and a calcined fireproof mica tape wrapped outside the conductor wire core, wherein the mica tape is wrapped with at least three layers, and the twisting pitch ratio of the mica tape is 20-30 times of the twisting outer diameter of the conductor wire core;
the coverage rate of the left-hand wrapped single-layer mica tape of the conductor is 100%, the coverage rate of the right-hand overlapped wrapped single-layer mica tape after the single-layer wrapping is 100%, and the coverage rate of the left-hand wrapped single-layer mica tape after the double-layer mica tape is wrapped is 100%.
Preferably, the mica tape is wrapped with cross-linked polyethylene for insulation, the average value of the insulation thickness is not less than a nominal value, and the thickness at the thinnest part is not less than 90% of the nominal value.
Preferably, when the nominal thickness of the crosslinked polyethylene insulation layer is greater than 0.6mm, the maximum thickness of any cross section should be no greater than 1.25 times the minimum thickness, and when the nominal thickness of the crosslinked polyethylene insulation layer is less than or equal to 0.6mm, the maximum thickness should be no greater than 1.4 times the minimum thickness.
Preferably, the cable is twisted after the insulation is extruded, and a layer of halogen-free flame retardant tape is wound after the cable is formed.
Preferably, the halogen-free flame-retardant belt is wrapped and then is extruded with the polyolefin inner sheath, the thickness of the inner sheath depends on the outer diameter of the inner sheath before extrusion, the average thickness of the sheath is not less than a nominal value, the thickness at the thinnest part is not less than 80% of the nominal value, and the maximum thickness of the sheath is not more than 1.66 times of the minimum thickness.
Preferably, the inner sheath is extruded and then braided with tinned copper wire armor, and the braiding coverage rate is not less than 88%; and extruding a polyolefin outer sheath after armoring.
Preferably, the method further comprises an antioxidation treatment process for the conductor core: the conductor adopts bare copper wire. Conductor wire drawing process: and (3) after the oxygen-free copper rod is drawn, applying antioxidant treatment to the bare copper wire, and forming a compact single-molecule protective layer on the copper surface.
The safe fire-proof cable for the port is manufactured by adopting the method.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a cable fire-resistant mica layer structure, a material and a production process by improving the structure, the material and the production process, which are reasonable in structure, advanced in process and easy to produce and manufacture. The low-smoke halogen-free bundled flame-retardant fireproof spray-proof performance is realized, the requirements of fire supply and splash tests under specific conditions of standard requirements and the normal working state of equipment can be continuously ensured are met, and the safe harbor returning requirements of luxury cruise ships and passenger ships are met.
Drawings
FIG. 1 is a schematic view of the cable of the present invention;
FIG. 2 is a table of parameters in the crosslinking step of the present invention;
FIG. 3 is a first illustration of the parameters of the extrusion process of the present invention;
FIG. 4 is a second table of parameters of the extrusion process according to the present invention;
FIG. 5 is a third table of parameters of the extrusion process according to the present invention;
FIG. 6 is a table of parameters of the extrusion process according to the present invention;
FIG. 7 is a table five of parameters of the extrusion process of the present invention;
FIG. 8 is a first view of an extrusion line speed parameter table according to the present invention;
FIG. 9 is a second extrusion line speed parameter table according to the present invention;
FIG. 10 is a table comparing the present invention with a conventional process product.
In the figure, 1, a conductor wire core; 2. calcining the fire resistant mica tape; 3. a crosslinked polyethylene insulating layer; 4. and a sheath layer.
Description of the embodiments
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the embodiment provides a safe fire-proof cable for port returning, which comprises a conductor core 1, a calcined fire-resistant mica tape 2 wrapped around the outer edge of the conductor core 1, a crosslinked polyethylene insulating layer 3 arranged on the outer edge of the mica tape 2, and a sheath layer 4 arranged outside the crosslinked polyethylene insulating layer 3, wherein the cable comprises a halogen-free fire-resistant tape wrapping layer, a halogen-free polyolefin inner sheath, a tinned copper wire armor weaving layer and a halogen-free polyolefin outer sheath from inside to outside.
It should be noted that the focus of this embodiment is on: the design of the mica tape 2 firstly adopts a three-layer mica tape structure, and the twisting pitch ratio of the mica tape is 20-30 times of the twisting outer diameter of the conductor wire core 1;
when wrapping, controlling the pulling wire speed and the wire winding tension; the coverage rate of the single-layer mica tape wrapped left by the conductor wire core 1 is 100%, the coverage rate of the single-layer mica tape wrapped right by the single-layer wrapping machine is 100%, and the coverage rate of the double-layer mica tape wrapped left by the single-layer wrapping machine is 100%. The operation is applicable to the LRBJ-2A mica tape wrapping machine manufactured by Shanghai nan ocean electrician.
When the mica tape is wrapped, the width and the wrapping pitch of the mica tape are determined through the outer diameter of the conductor wire core 1. For example, the outer diameter of the conductor core 1 is 1.3mm, so that the wrapping pitch of the mica tape is determined to be 26mm-39mm, 30mm is the most preferable, and the actual determination of the pitch can be selected according to the product requirement. The width of the mica tape has a value of pi 4 times multiplied by the outer diameter of the conductor core 1.
In addition, in order to improve the oxidation resistance of the conductor wire core 1, in the wire drawing process of the conductor wire core 1, an antioxidant treatment is applied to the bare copper wire after the oxygen-free copper rod is drawn, a layer of compact single-molecule protective film is formed on the copper surface, so that the contact between air and the copper surface can be effectively isolated, the corrosion and the color change of the conductor are prevented, the original luster of copper is maintained, the oxidation of the bare copper wire conductor is avoided, and the electrical performance of the conductor can be fully ensured.
The method comprises the following steps: and when the copper wire is wire-drawn and annealed, five thousandths of antioxidant solution (such as benzotriazole alcohol solution) is added, wherein the addition amount is just to infiltrate the copper wire, so that a compact single-molecule protective film can be formed on the surface.
The performance index comparison is performed in this example through the experiment as in fig. 10:
conventional fire resistant cables: the number of the wrapping layers of the mica tape is at most two, the wrapping is longitudinally performed, the covering rate is 25%, the twisting pitch ratio of the mica tape is 14-20 times of the twisting outer diameter of the conductor wire core, and the polyester tape is wrapped after the wire core is cabled.
It should be noted that, in other embodiments, the effect in the table cannot be achieved by simply increasing the number of the mica tapes to be wrapped or the rate of covering, and the best technical effect is maintained only if the three-layer mica tape structure is satisfied, the twisting pitch ratio of the mica tapes is 20-30 times of the twisting outer diameter of the conductor core 1, and the rate of covering is 100%, namely the table content in fig. 10 is satisfied.
The following are specific manufacturing methods, as well as the mechanical properties of the final product, it being noted that the dimensional parameters designed in the following steps are understood as a single example only and are not limiting to the specific implementation:
including stranded copper conductor, power cable conductor sectional area scope: 1mm of 2 -300mm 2 Communication cable conductor cross-sectional area range 0.50mm 2 -2.5mm 2 The method comprises the steps of carrying out a first treatment on the surface of the Longitudinally wrapping three layers of calcined mica tapes on the conductor, wherein the temperature of the mica tapes is 1000 ℃; the overlapping rate of the mica tape is 100%, and the thickness of the single-layer mica tape is 0.15mm; the average value of the insulation thickness of the extruded crosslinked polyethylene after wrapping the mica tape is not less than the nominal value, the thickness of the thinnest part is not less than 90% of the nominal value, when the nominal value is greater than 0.6mm, the maximum thickness of any cross section is not greater than 1.25 times of the minimum thickness, and when the nominal value is less than or equal to 0.6mm, the maximum thickness is not greater than the minimum thickness1.4 times; extruding and insulating, and then crosslinking;
as further described herein, the sheath and insulation thickness are controlled during production by the concentricity of the core and the sleeve caliber in the extrusion die, and the final extruded sheath and insulation thickness are controlled by changing the core sleeves with different specifications and dimensions, and the operation is applicable to commercially available extrusion machines such as SJ30, SJ45, SJ50, SJ65, SJ90 and SJ 120.
The crosslinking mode is as follows: sealing the end of the insulating wire core to be crosslinked by waterproof adhesive cloth, extruding and simultaneously applying ultraviolet chemical crosslinking. The ultraviolet wavelength is 365nm;
the crosslinking requirements are shown in accordance with the table in fig. 2.
Twisting the cable after extrusion insulation, wrapping a layer of halogen-free flame-retardant tape after cabling, and forming the thickness of the halogen-free flame-retardant tape: 0.05mm. The halogen-free flame-retardant belt is wrapped and then is extruded with a polyolefin inner sheath, the thickness of the inner sheath depends on the outer diameter of the inner sheath before extrusion, the average thickness of the sheath is not less than a nominal value, the thickness of the thinnest part is not less than 80% of the nominal value, and the maximum thickness of the sheath is not more than 1.66 times of the minimum thickness. After the sheath is extruded, braiding tin-plated copper wire armor is performed, and the braiding coverage rate is not less than 88%; after armouring, the polyolefin outer sheath is extruded, the surface of the cable is smooth and round, and the obvious defects of unevenness and the like are avoided.
When the braiding machine is used for braiding, parameters of the diameter, the number and the angle of a single wire are set, and the braiding coverage rate is adjusted in a self-adaptive mode according to process requirements and equipment types. Under the condition of determining the number and the angle, the larger the diameter of a single wire is, the larger the coverage rate is; the smaller the angle is, the larger the coverage rate is, and the larger the number is, the larger the coverage rate is. The knitting machine is applicable to knitting machines such as model GSB-1Z, GSB-2Z, WGSB-3 produced by Shanghai Nanyang electrician. In specific implementation, the diameter of the braided wire is determined according to the outer diameter of the conductor wire core 1 before braiding, if the outer diameter of the braided wire before braiding is less than or equal to 10mm, the single wire diameter of the braided wire is selected to be 0.2mm, if the outer diameter of the braided wire before braiding is less than or equal to 30mm, the single wire diameter of the braided wire is selected to be 0.3mm, and if the single wire diameter of the braided wire before braiding is more than 30mm, the single wire diameter of the braided wire is selected to be 0.4mm. The yarn diameter of the braided yarn is selected according to the logic, so that the structural stability of the product can be improved, and the physical properties of the product can be improved. During braiding, the number of the braided filaments is 5-9, and the modulation angle is set to be 45 degrees, so that the braiding coverage rate reaches 88%.
As for the requirements of the cable surface, the defective product rate of normal equipment can be generated, if the braided wire is jumped due to improper operation, the cable surface is uneven, the defective product is destroyed, and the product with smooth and round surface and no uneven defect is reserved.
The extrusion process conditions of the insulation and the sheath are as follows:
the zones of extrusion were heated as required by the process and temperature control was expressed by means of an instrument. The heating temperature of each zone should be carried out according to the requirements of fig. 3-7, and the temperature of the instrument is checked by using a mercury thermometer. The extrusion specifications of the extruders of all types are shown in the remark column of fig. 3-7, and the load of each device is balanced according to the production task condition in the production process.
SJ-30 extrusion zone temperature settings are shown by reference to the table of FIG. 3 (remark: insulation extrusion gauge 4mm & lt,);
SJ-45 extrusion zone temperature settings are shown with reference to the table of FIG. 4 (remark: insulation extrusion gauge 10mm and below);
the temperature settings of the extruded sections of SJ-65 are shown in the table of FIG. 5 (remark: insulation extrusion specification 185mm and below, jacket extrusion outside diameter 27mm and below);
the temperature settings of the extruded sections of SJ-90 are shown in the table of FIG. 6 (remark insulation extrusion specification 400mm and below, jacket extrusion outside diameter 45mm and below);
the temperature settings for the SJ-120 extrusion zones are shown in the table of FIG. 7 (remark: outside diameter 13mm or more before jacket extrusion).
The sheath and insulation extrusion line speeds are shown in the tables of fig. 8 and 9.
When the equipment is operated, the noise sound pressure level is below 75dB (A), the air quality meets the requirements of national environmental air quality standards (GB 3095-2012), the processing production speed is high, the electricity can be saved by about 50%, and the requirements of energy conservation and environmental protection are met.
The extrusion molding temperature and the wire outlet speed are controlled, so that the plasticizing effect of the insulating material and the sheath material is realized, and the following mechanical property, electrical property and aging property are finally realized. In the conventional process, the interrelationship of extrusion molding temperature and wire outlet speed is often ignored, the wire outlet speed and the extrusion molding temperature are adjusted according to different extrusion molding materials and product specifications, insulation and a sheath which are extruded can be ensured to be bubble-free, and the plasticizing effect is good. It should be noted that, before extrusion, the conductor core 1 is wrapped by the mica tape, and on the basis of the special mica tape wrapping structure, the extrusion molding temperature in the subsequent process can be designed to be lower than the conventional extrusion molding temperature, the wire outlet speed is faster, and the excellent physical properties can be maintained as well, and meanwhile, the energy-saving effect is achieved. Namely, the front and rear processes produce synergistic effect and realize more excellent product performance while promoting each other.
The final product properties were as follows: (1) Safety return cables with voltage class of 0.6/1kV and below, the diameter of the cables is not more than 20mm, splash test is carried out according to IEC60331-2 and CEI EN50200 standard, the cables are burned for 180min at 830 ℃ flame temperature, and all the safety return cables ensure normal working state; (2) Safety return cables with voltage class of 0.6/1kV and below, the diameter of the cables exceeds 20mm, splash test is carried out according to IEC60331-1 and BS8491 standard, the cables are burned for 180min at 830 ℃ flame temperature, and all the safety return cables ensure normal working state; (3) the bare copper conductor does not undergo peroxidation.
Test data:
1. physical properties of insulating machinery
1.1 insulating mechanical Properties before and after aging
Tensile strength before aging: 19.8N/mm2 requirement: not less than 12.5N/mm 2
Elongation at break before aging: 470% of the requirements are: more than or equal to 200 percent
After the air oven ages (135 ℃ C. X168 h)
Rate of change of tensile strength after aging: +17% requirement: less than or equal to +/-25 percent
Elongation at break change after aging: -2% requirement: less than or equal to +/-25 percent
1.2 thermal extension: temperature 200 ℃, load time: 15min, mechanical stress: 20 N/cm 2
Elongation under load: 38% of the requirements are: less than or equal to 175 percent
Permanent elongation after cooling: 0. the requirements are: less than or equal to 15 percent
1.3 mechanical Properties of the inner sheath before and after aging
Tensile strength before aging: 12.4N/mm2 requirement: not less than 9.0N/mm 2
Elongation at break before aging: 160% of requirements: more than or equal to 120 percent
After the air oven ages (100 ℃ C. X168 h)
Tensile strength after aging: 13.9N/mm2 requirement: more than or equal to 7.0N/mm 2
Rate of change of tensile strength after aging: +12% requirement: less than or equal to + -30 percent
Elongation at break before aging: 150% of requirements: more than or equal to 110 percent
Elongation at break change after aging: -6% requirement: less than or equal to + -30 percent
1.4 high temperature pressure test of inner sheath
Test temperature: 80 DEG C
Duration of time: 6h
Indentation depth: 9% of requirements: less than or equal to 50 percent
1.5, inner sheath thermal shock test
Test temperature: 150 DEG C
Duration of time: 1h
Detection result: no cracking requirement: does not crack
2. Mechanical and physical property test of outer sheath
2.1 mechanical Properties of the outer sheath before and after aging
Tensile strength before aging: 13.9N/mm 2 The requirements are: not less than 9.0N/mm 2
Elongation at break before aging: 210% of requirements: more than or equal to 120 percent
After the air oven ages (100 ℃ C. X168 h)
Tensile strength after aging: 15.8N/mm 2 The requirements are: more than or equal to 7.0N/mm 2
Rate of change of tensile strength after aging: +14% requirement: less than or equal to + -30 percent
Elongation at break before aging: 210% of requirements: more than or equal to 110 percent
Elongation at break change after aging: 0. the requirements are: less than or equal to + -30 percent
2.2 high temperature Performance-outer sheath high temperature pressure test
Test temperature: 80 DEG C
Duration of time: 6h
Indentation depth: 9% of requirements: less than or equal to 50 percent
2.3, thermal shock test of outer sheath
Test temperature: 150 DEG C
Duration of time: 1h
Detection result: no cracking requirement: does not crack
2.4 Low temperature Performance-Low temperature tensile test of outer sheath
Test temperature: -15 DEG C
Duration of time: 4h
Elongation rate: 80% of the requirements are: more than or equal to 30 percent
2.5 Low temperature Performance-Low temperature tensile test of finished Cable
Test temperature: -15 DEG C
Duration of time: 16h
Elongation rate: no cracking requirement: does not crack
3. Additional compatibility aging test
Aging temperature: 100 DEG C
Aging time: 168h
XLPE insulation:
rate of change of tensile strength after aging: +8% requirement: less than or equal to +/-25 percent
Elongation at break change after aging: -15% requirement: less than or equal to +/-25 percent
SHF1 inner sheath:
rate of change of tensile strength after aging: +24% requirement: less than or equal to + -30 percent
Elongation at break change after aging: 0. the requirements are: less than or equal to +/-25 percent
SHF1 outer sheath:
rate of change of tensile strength after aging: +20% requirement: less than or equal to + -30 percent
Elongation at break change after aging: -5% requirement: less than or equal to +/-30 percent.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The manufacturing method of the safe return fireproof cable comprises a conductor core and a calcined fireproof mica tape wrapped outside the conductor core, and is characterized in that: the mica tape is wrapped with at least three layers, and the twisting pitch ratio of the mica tape is 20-30 times of the twisting outer diameter of the conductor wire core;
the coverage rate of the left-hand wrapped single-layer mica tape of the conductor is 100%, the coverage rate of the right-hand overlapped wrapped single-layer mica tape after the single-layer wrapping is 100%, and the coverage rate of the left-hand wrapped single-layer mica tape after the double-layer mica tape is wrapped is 100%.
2. The method for manufacturing the safe return fireproof cable according to claim 1, wherein: the mica tape is wrapped, then crosslinked polyethylene is extruded for insulation, the average value of the insulation thickness is not smaller than a nominal value, and the thickness at the thinnest part is not smaller than 90% of the nominal value.
3. The method for manufacturing the safe return fireproof cable according to claim 2, wherein: when the nominal thickness of the crosslinked polyethylene insulation layer is greater than 0.6mm, the maximum thickness of any cross section should be not greater than 1.25 times the minimum thickness, and when the nominal thickness of the crosslinked polyethylene insulation layer is less than or equal to 0.6mm, the maximum thickness thereof should be not greater than 1.4 times the minimum thickness.
4. A method of manufacturing a safe return fire protection cable according to claim 3, wherein: and (3) twisting the cable after extrusion insulation, and wrapping a layer of halogen-free flame retardant tape after cabling.
5. The method for manufacturing the safe return fireproof cable according to claim 4, wherein: the halogen-free flame-retardant belt is wrapped and then is extruded with a polyolefin inner sheath, the thickness of the inner sheath depends on the outer diameter of the inner sheath before extrusion, the average thickness of the sheath is not less than a nominal value, the thickness of the thinnest part is not less than 80% of the nominal value, and the maximum thickness of the sheath is not more than 1.66 times of the minimum thickness.
6. The method for manufacturing the safe return fireproof cable according to claim 5, wherein: after the inner sheath is extruded, braiding tin-plated copper wire armor, wherein the braiding coverage rate is not less than 88%; and extruding a polyolefin outer sheath after armoring.
7. The method for manufacturing the safe return fireproof cable according to claim 1, wherein: the method also comprises the oxidation resistance treatment process for the conductor core: the conductor adopts bare copper wire, conductor wire drawing process: and (3) after the oxygen-free copper rod is drawn, applying antioxidant treatment to the bare copper wire, and forming a layer of compact single-molecule protective film on the copper surface.
8. A safe return fire protection cable, characterized in that it is manufactured by a method for manufacturing a safe return fire protection cable according to any one of claims 1-7.
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| CN202310368045.3A CN116487119A (en) | 2023-04-08 | 2023-04-08 | Safe fire-proof cable for port returning and manufacturing method thereof |
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| CN202310368045.3A CN116487119A (en) | 2023-04-08 | 2023-04-08 | Safe fire-proof cable for port returning and manufacturing method thereof |
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| CN116487119A true CN116487119A (en) | 2023-07-25 |
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