CN110136892A - A kind of ceramic polyolefin fire prevention midium voltage cable manufacturing method - Google Patents

A kind of ceramic polyolefin fire prevention midium voltage cable manufacturing method Download PDF

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Publication number
CN110136892A
CN110136892A CN201910540686.6A CN201910540686A CN110136892A CN 110136892 A CN110136892 A CN 110136892A CN 201910540686 A CN201910540686 A CN 201910540686A CN 110136892 A CN110136892 A CN 110136892A
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layer
refers
cable
fire
thickness
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Inventor
黄静
王杨
何壮
李岚斌
杨容
李俊
方海波
田旭琴
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Shang Wei Ltd By Share Ltd
Sunway Co Ltd
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Shang Wei Ltd By Share Ltd
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Priority to CN201910540686.6A priority Critical patent/CN110136892A/en
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    • 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
    • H01B13/0006—Apparatus or processes specially adapted for manufacturing conductors or cables for reducing the size of conductors or cables
    • 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
    • H01B13/02—Stranding-up
    • 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
    • H01B13/221—Sheathing; Armouring; Screening; Applying other protective layers filling-up interstices
    • 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
    • H01B13/24—Sheathing; Armouring; Screening; Applying other protective layers 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
    • 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
    • H01B7/04—Flexible cables, conductors, or cords, e.g. trailing cables
    • 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
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/182—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring comprising synthetic filaments
    • H01B7/183—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring comprising synthetic filaments forming part of an outer sheath
    • 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
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/187—Sheaths comprising extruded non-metallic layers
    • 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
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/1875—Multi-layer sheaths
    • 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
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/22—Metal wires or tapes, e.g. made of steel
    • H01B7/226—Helicoidally wound metal wires or tapes
    • 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
    • H01B7/292—Protection against damage caused by extremes of temperature or by flame using material resistant to heat
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables
    • H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables
    • H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
    • H01B9/027—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients composed of semi-conducting layers

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Insulated Conductors (AREA)

Abstract

The invention discloses a kind of ceramic polyolefin fire prevention midium voltage cable manufacturing method, the manufacturing method of the cable is as follows: wire drawing → conductor process → three-layer co-extruded chemical crosslinking → buffer layer → metallic shield → stranding → oxygen barrier layer → first wrapping layer → fireprotection layer → second wrapping layer → armor → third wrapping layer → extrudes oversheath → performance detection；The cable has fully considered the relationship between the electrical property and fire resistance of middle high-pressure cable, solve equalization point between the two, using extruding ceramic polyolefin as flame retardant coating, the heat-insulated oxygen barrier insulating layer of hard, secret room ceramic-like can be rapidly formed in cable fire, processing technology is simple, industrial frequency withstand voltage test after being able to satisfy fire resistance test, insulating layer can be intact at high temperature, guarantees the normal work and operation of product.

Description

A kind of ceramic polyolefin fire prevention midium voltage cable manufacturing method
Technical field
The present invention relates to field of cable technology, specifically a kind of ceramic polyolefin fire prevention midium voltage cable manufacturer Method.
Background technique
Fire-resisting cable is widely used in the important department such as skyscraper, subway, power plant, nuclear power station and public field again Institute.Many infrastructure projects start fire-resisting cable of showing appreciation for somebody simultaneously, so as to after fire occurs, power supply system be able to maintain it is stable just Often operating facilitates the expansion of rescue work, the as far as possible loss of the injures and deaths and finance of reduction personnel.
What is mostly used both at home and abroad at present is to aoxidize magnesium mineral fire-resisting cable and mica tape/rubber composite belt fire-resisting cable, The former manufacturing cost is high, and manufacture laying difficulty is big；The latter has certain unstability, and the mica sheet of many mica tapes is easy de- Fall, especially the manufacture of small area fire-resisting cable, product quality it is difficult to ensure that.With the continuous renewal of refractory material, ceramic Silastic fire resistance cable starts to be used, but silicon rubber manufacturing procedure is more, and the period is longer, and production efficiency is low, and ceramics The flame retardant coating hardness that change SiClx rubber is formed after combustion smaller, not certain adhesive force and intensity, are easily broken and fall off, resistance to Fiery effect is poor.Secondly, silicon rubber will form SiO 2 powder after combustion, adhesive ability is low, dust easy to form, to people Member causes secondary injury.
State Intellectual Property Office disclosed a Publication No. 202758656U, entitled " volume on February 27th, 2013 Constant voltage 6kV-35kV Ceramic silicon rubber insulation in press fire-resisting cable " practical type patent, the invention discloses specified electricity Fire-resisting cable is pressed in pressure 6kV-35kV Ceramic silicon rubber insulation, by using using silicon rubber as the semiconductive conductor of base-material or absolutely Edge shielding material, devises using silicon rubber as the semiconductive of base-material conductor shield+Ceramic silicon rubber insulating layer+with silicon rubber and is The technique that three layers of the semi-conductive insulation shield layer of base-material squeezes out simultaneously, using Ceramic silicon rubber as also conduct while insulating layer Flame retardant coating.Originally practical to be used as insulation and flame retardant coating using Ceramic silicon rubber, Ceramic silicon rubber cannot be applicable in as insulating In the flame retardant coating hardness that the midium voltage cable of voltage rating 30kV or more, Ceramic silicon rubber are formed after combustion as flame retardant coating Smaller, not certain adhesive force and intensity, is easily broken and falls off, and fire resisting effect is poor.Secondly, silicon rubber after combustion can shape At SiO 2 powder, adhesive ability is low, and dust easy to form causes secondary injury to personnel.
State Intellectual Property Office disclosed a Publication No. 202758656U on 06 06th, 2017, and entitled " one The practical type patent of kind ceramic fire-resisting cable ", the invention discloses a kind of ceramic fire-resisting cable, the ceramic fire resisting Cable includes several cable cores, and the cable core successively includes conductor, internal shield, insulating layer, external shielding layer and gold from the inside to the outside Belong to shielded layer；It from the inside to the outside successively include fire-resistant wrapping tape layer, inner restrictive coating, ceramic polyolefin fire resisting outside several cable cores Layer, metal armor layers and external sheath layer.Although this practical flame retardant coating structural material quotient uses ceramic polyolefin, not Meet midium voltage cable fire resistance test requirement, industrial frequency withstand voltage test is carried out after fire resistance test, it is originally practical to be unable to satisfy the pressure resistance Test.
Summary of the invention
In view of the deficiencies of the prior art, it is an object of the invention to propose a kind of ceramic polyolefin fire prevention midium voltage cable system Method is made, has fully considered the relationship between the electrical property and fire resistance of middle high-pressure cable, solves balance between the two Point；Especially with ceramic polyolefin is extruded as flame retardant coating, hard, secret room can be rapidly formed in cable fire The heat-insulated oxygen barrier insulating layer of ceramic-like；In the case where 350~1600 DEG C have flame, nonflame, does not melt, does not drip, do not fall off, temperature is got over Height, the time is longer, and the ceramic-like after burning is harder, and residue is ceramic inorganic object, residual volume >=85%, secondly, processing work Skill is simple, requires low, high production efficiency to process equipment is squeezed out, can be good at adapting to industrialization large-scale production；Furthermore this Invention individually designed buffer layer in structure, the industrial frequency withstand voltage test after being able to satisfy fire resistance test；Buffer layer using 1.0~ The Semi-conductive buffer band of 2.0mm is overlapped around insulated wire cores surface；When cable burns under thermal-flame, insulating layer is heated Expansion softening, by can reduce outside split-phase metal screen as layer buffer design in the wrapped semiconductive band in insulated wire cores surface Shield tape keeps insulating layer intact at high temperature the stress and mechanical damage of insulating layer after softening, guarantee product normal work and Operation.
To achieve the above object, the technical scheme adopted by the invention is that:
A kind of ceramic polyolefin fire prevention midium voltage cable manufacturing method, the manufacturing method of the cable are as follows: wire drawing → conductor Process → three-layer co-extruded chemical crosslinking → buffer layer → metallic shield → stranding → oxygen barrier layer → first wrapping layer → fireprotection layer → Second wrapping layer → armor → third wrapping layer → extrudes oversheath → performance detection；
The three-layer co-extruded chemical crosslinking refers on three-layer co-extruded chemical crosslinking catenary suspension type continuous vulcanization production line while squeezing out semiconductive Conductor shielding, crosslinked polyethylene shielding, semi-conductive insulation shield simultaneously form insulated wire cores after chemical crosslinking, squeeze out semiconductive Conductor shielding with a thickness of 0.8mm, crosslinked polyethylene shielding thickness is 4.5mm, semi-conductive insulation shield with a thickness of 0.8mm；
The buffer layer refers to that, using thickness 1-1.5mm, the Semi-conductive buffer band of width 60-70mm is overlapped around insulation Core surface；
The metallic shield refers to that the copper strips that width is 40-45mm carries out wrapped using with a thickness of 0.1-0.12mm；
The stranding, which refers to, is twisted three cores after metallic shield, and is added in the gap of core fire-retardant High temperature packing rope, the diameter of the inflaming retarding high-temperature gasket for packing are φ 8-15mm, oxygen index (OI) OI >=35%, fusing point >=260 DEG C, at Around high fire-retardance glass fibre band of double-baging, the width of the high fire-retardance glass fibre band is for overlapping outside cable core after cable 30-80mm；
The oxygen barrier layer, which refers to, to be uniformly and intimately extruded in a thickness of the high fire-retardance polyolefin oxygen barrier material of 1.5-2.8mm Core surface after stranding, processing temperature are 80 DEG C -165 DEG C；
First wrapping layer refers to the high fire-retardance glass for being overlapped that wrapped multi-layered thickness is 0.15-0.52mm outside oxygen barrier layer Fiber package band；
The fireprotection layer, which refers to, uses screw rod of the compression ratio for 1.1:1-1.5:1, draw ratio more than or equal to 20 will be with a thickness of The ceramic polyolefine material of 4.5mm-5mm is uniformly and intimately extruded in the first wrapping layer；
Second wrapping layer refers to the high fire-retardance glass fibre that wrapped multi-layered thickness is 0.15-0.25mm outside fireprotection layer Band；
The armor refers to that will to carry out Double-layer gap with a thickness of the metal tape of 0.25-0.40mm wrapped or by diameter be The wire of 0.8-1.2mm carries out single layer and is spirally wound on outside the second wrapping layer；
The third wrapping layer refers to the high fire-retardance glass fibre that wrapped multi-layered thickness is 0.15-0.25mm outside armor Band；
The oversheath that extrudes refers to that the screw rod using low compression ratio 1.1:1-1.2:1 and draw ratio more than or equal to 20 will be thick Degree is that the low smoke halogen-free flame-retardant polyolefin jacket material of 4.3-4.5mm is uniformly and intimately extruded in wrapping layer.
Diameter is used to pass through excessively on guy-line equipment for electrician's round copper rod of 8mm further, the wire drawing refers to A mold draws and is annealed into electrician's copper wire that diameter is 2.56-2.9mm.
Further, the conductor process refers to electrician's copper wire by 48-60 root 2.56mm-2.9mm on frame winch It carries out process and is layered the round conductor for pressing into that diameter is 18.6-23.5mm.
Further, the extruding machine processing temperature of the three-layer co-extruded chemical crosslinking is 85~115 DEG C, it is crosslinked pipeline temperature 260~380 DEG C, extruded velocity about 5-7m/min of degree, mold core diameter are 19.4-24.5mm, and middle mode diameter is 20.2-25.1mm, Case diameter is 30.4-35.3mm.
Further, three cores are twisted according to 30-60 times of twisted diameter of pitch in the stranding.
Further, the diameter of the inflaming retarding high-temperature gasket for packing be φ 12mm, oxygen index (OI) OI >=35%, fusing point >= 260℃。
Further, the oxygen barrier layer refers on low smoke and zero halogen extruder, with half plsitive mold, using low compression ratio 1.1:1~1.5:1, the low smoke and zero halogen screw rod that draw ratio is L/D >=20, oxygen index (OI) is oxygen barrier in 36~40 high fire-retardance polyolefin Material is uniformly and intimately extruded in the cable core surface after stranding, and processing temperature is controlled at 80 DEG C~165 DEG C.
Further, the fireprotection layer step refers to that on low smoke and zero halogen extruder, with half plsitive mold, use is low Compression ratio 1.1:1~1.2:1, the common low smoke and zero halogen screw rod that draw ratio is L/D >=20 are uniformly tight by ceramic polyolefine material It is thickly extruded in wrapping layer, processing temperature is controlled at 140 DEG C~150 DEG C.
Further, the oversheath step that extrudes refers on low smoke and zero halogen extruder, with half plsitive mold, adopt It is the common low smoke and zero halogen screw rod of L/D >=20 with low compression ratio 1.1:1~1.5:1, draw ratio, by the low of oxygen index (OI) OI >=36% Cigarette halogen-free anti-flaming polyolefin jacket material, which is uniformly and intimately extruded in wrapping layer, forms oversheath, and processing temperature control exists 100~150 DEG C.
Further, the performance detection step refers to electrical property, machine using cable special inspecting equipment to product Tool performance, fire resistance are detected.
The beneficial effects of the present invention are:
(1) present invention is in the structure basis of traditional fire-resisting cable, by increasing or changing corresponding structure or material, if A kind of ceramic polyolefin fire prevention midium voltage cable is counted out, which can be using double blowtorch, and flame temperature is 750 DEG C~800 DEG C, and apply the voltage rating of cable simultaneously, continue for guaranteeing the integrality of route under fiery 90min burning condition, cable is not hit It wears, and after fire resistance test in 1 hour, the integrality of sample is checked, in the case where keeping testing reset condition, Apply 3.5U to sample0Test voltage continue 15min, cable does not puncture；
(2) present invention is compared with other medium and high voltage cables of preventing fires, the individually designed buffer layer in structure, and buffer layer uses 1.0 The Semi-conductive buffer band overlapping of~1.5mm has good mechanical performance and stability, works as cable around insulated wire cores surface When burning under thermal-flame, the softening of insulating layer expanded by heating is slow by being used as in the wrapped semiconductive band in insulated wire cores surface Rushing layer design can reduce outside split-phase metal mask tape to the stress and mechanical damage of insulating layer after softening, make insulating layer in height It is intact under temperature, guarantee the normal work and operation of product；At the same time, which passes through the first wrapping layer, the second wrapping layer, armour Layer, third wrapping layer and the setting for extruding oversheath are filled, the stability of the cable is further improved, ensure that its mechanical property And mechanical performance, there is good tension and anti-bending strength, so that the cable is able to satisfy the laying demand of a variety of environment, arduous The normal work and operation of cable are still able to maintain under environment after multiple physical or mechanically deform；
(3) for the present invention using the oxygen barrier material of low smoke and zero halogen ceramic polyolefin is extruded as fire proof construction, which is a kind of Have excellent performance it is novel can porcelain polyolefin high-polymer refractory materials, which can guarantee cable under flame status or 500 DEG C It is rapid curing and gradually ceramic, highest are resistant to 1200 DEG C of continuous high temperatures under the above high temperature, have crust speed fast, investing temperature Low, ceramic armour body intensity is high after ablation, and surface is complete, without obvious slight crack, and section can generate uniform micropore, can play excellent Different heat-insulated, cooling, the fiery effect of gear；Secondly, processing technology is simple, low, high production efficiency is required to process equipment is squeezed out, it can Well adapt to industrialization large-scale production；The cable by stranding, oxygen barrier, the first wrapping layer, fireprotection layer, the second wrapping layer, The structure of third wrapping layer and oversheath has reached multi-layer fire-retarded fire insulation function, ensure that significantly the cable it is fire-retardant, oxygen barrier, Fire resistance, so that the cable is still able to maintain normal work in high fire；
(4) using the low cigarette polyolefine material of high-flame-retardanthalogen-free halogen-free as oversheath, product will not generate the present invention in burning Visible flame will not generate a large amount of toxic smogs in combustion, therefore strive when fire occurs to the starting of every system Take the time by force, ensure that the person and property safety of the people, reduces national loss；
(5) cable produced by the present invention has stronger shielding properties, especially in traffic environment, by three-layer co-extruded The combination of chemical crosslinking and split-phase metallic shield can reduce influence of the extraneous factor to cable work, and the cable is compared to tradition electricity The anti-extraneous factor ability of cable is stronger, more can safe and stable operation.
Detailed description of the invention
Fig. 1 is the method flow diagram of present invention manufacture cable:
Fig. 2 is structural schematic diagram of the invention.
In figure: 1, conductor；2, semiconductor conductive shield；3, crosslinked polyethylene shields；4, semi-conductive screen；5, buffer layer； 6, metallic shield；7, stranding；8, oxygen barrier layer；9, the first wrapping layer；10, fireprotection layer；11, the second wrapping layer；12, armor；13, Third wrapping layer；14, oversheath.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention is made into one with reference to the accompanying drawing Step illustrates.
Embodiment 1
A kind of ceramic polyolefin fire prevention midium voltage cable manufacturing method, method includes the following steps: wire drawing → conductor twists System → three-layer co-extruded chemical crosslinking → buffer layer → metallic shield → stranding → oxygen barrier layer → first wrapping layer → fireprotection layer → the Two wrapping layers → armor → third wrapping layer → extrude oversheath → performance detection；
The drawing step, which refers to, uses diameter to pass through excessively on guy-line equipment for electrician's round copper rod of 8mm high conductivity A mold draws and is annealed into electrician's circular copper wire that diameter is 2.56mm；
The conductor process step, which refers to, to be carried out process by electrician's circular copper wire of 48 2.56mm and is divided on 500 frame winches Layer presses into the round conductor 1 that diameter is 18.6mm, and outermost layer twisting pitch is 220mm；Adjacent layer is contrary, outermost Direction of lay is left-hand；
The three-layer co-extruded chemical crosslinking step refers on three-layer co-extruded chemical crosslinking catenary suspension type continuous vulcanization production line while squeezing out Semiconductive conductor shielding 2, crosslinked polyethylene shielding 3, semi-conductive insulation shield 4 simultaneously form insulated wire cores after chemical crosslinking； 85~115 DEG C of extruding machine processing temperature, be crosslinked 260~380 DEG C of pipe temperature, squeeze out semiconductive conductor shielding 2 with a thickness of 0.8mm, crosslinked polyethylene shielding 3 with a thickness of 4.5mm, semi-conductive insulation shield 4 with a thickness of 0.8mm, extruded velocity about 7m/ Min, mold core diameter are 19.4mm, and middle mode diameter is 20.2mm, Case diameter 30.4mm.
5 step of buffer layer refers to that, using 1.0mm, the Semi-conductive buffer band of width 60mm is overlapped around insulated wire cores Surface；
6 step of metallic shield refers to that the soft copper band progress single overlays of width 40mm are wrapped using thickness 0.10mm, Wrapped overlap rate 18%；
7 step of stranding refer to by the core after three split-phase metallic shields 6 according to 60 times of twisted diameter pitch into Row is twisted, direction of lay dextrad, and is subject to inflaming retarding high-temperature gasket for packing in core gap, and overlapping is around high resistant of double-baging outside cable core Fire glass fibre band；The width of the high fire-retardance glass fibre band is 30mm；The diameter of the inflaming retarding high-temperature gasket for packing For φ 8mm, oxygen index (OI) OI >=35%, fusing point >=260 DEG C；
8 step of oxygen barrier layer refers on common low smoke and zero halogen extruder, with half plsitive mold, is contracted using low pressure It is than 1.1:1, the common low smoke and zero halogen screw rod that draw ratio is L/D >=20, oxygen index (OI) is oxygen barrier in 36~40 high fire-retardance polyolefin Material is uniformly and intimately extruded in the cable core surface after stranding, squeezes out thickness 1.5mm, and processing temperature is controlled at 80 DEG C~165 DEG C；
First wrapping layer 9 refers to is overlapped the wrapped high fire-retardance glass fiber package with a thickness of 0.15mm outside oxygen barrier layer 8 Band is overlapped wrapped 2 layers, overlap rate 18%；
10 step of fireprotection layer refers on common low smoke and zero halogen extruder, with half plsitive mold, using low pressure It contracts than 1.1:1, the common low smoke and zero halogen screw rod that draw ratio is L/D >=20, it will be uniform with a thickness of 4.5mm ceramic polyolefine material It is closely extruded in wrapping layer, processing temperature is controlled at 140 DEG C~150 DEG C；
Second wrapping layer 11 refers to outside fireprotection layer using the high fire-retardance glass fibre band with a thickness of 0.15mm, weight 2 layers of lap wound packet, overlap rate 20%；
The armor 12 refers to that carry out Double-layer gap using the metal tape with a thickness of 0.25-0.40mm wrapped or by diameter It is spirally wound on outside the second wrapping layer for the wire progress single layer of 0.8-1.2mm, clearance rate 45%；
The third wrapping layer 13 refers to outside armor using the high fire-retardance glass fibre band with a thickness of 0.15mm, weight 2 layers of lap wound packet, overlap rate 16%；
14 step of oversheath that extrudes refers on common low smoke and zero halogen extruder, with half plsitive mold, uses Low compression ratio 1.1:1, the common low smoke and zero halogen screw rod that draw ratio is L/D >=20, the low smoke and zero halogen of oxygen index (OI) OI >=36% is hindered Combustion 14 material of polyolefin oversheath is uniformly and intimately extruded in formation oversheath 14 in wrapping layer, squeezes out thickness 4.3mm, processing temperature Degree control is at 100~150 DEG C；
The performance detection step refers to using cable special inspecting equipment to the electrical property of product, mechanical performance, fire resisting Performance is detected；Conductor DC resistance when electrical property includes but is not limited to 20 DEG C, industrial frequency withstand voltage test, partial discharge test, Impulse voltage test, 4h test；Mechanical performance includes but is not limited to insulation and the mechanical and physical performance test of sheath, ageing properties Test, hot elongation test, water absorption test, shrinkage test are detected；Fire resistance refers to using double blowtorch, flame temperature 750 ~800 DEG C, for fiery time 90min, apply the pressure test of the specified pressure of cable during test simultaneously, 1 after fire resistance test In hour, the integrality of sample is checked.
Advantage of the cable that embodiment 1 is proposed after carrying out various tests compared with various traditional cables is as follows:
1. without fireprotection layer 10, oxygen barrier layer 8, buffer layer 5 traditional cable:
For the traditional cable when carrying out fire resistance test, flame temperature is 750~800 DEG C, for fiery time 90min, After fire resistance test terminates 1 hour, the integrality of cable is checked, the integrity degree of the cable is 60% or so；It is tried in fire resisting Apply the pressure test of voltage rating during testing to cable simultaneously, cable is breakdown；In the case where keeping testing reset condition, The test voltage for applying 3.5U to cable continues 15min, breakdown；After carrying out fire resistance test, the cable is allowed to continue working 24 hours, which cannot keep steady operation, and interruption breaks down；
2. without fireprotection layer 10, the second wrapping layer 11, oxygen barrier layer 8, first wrapping layer 9, buffer layer 5, third wrapping layer 13 Traditional cable:
For the traditional cable when carrying out fire resistance test, flame temperature is 750~800 DEG C, for fiery time 90min, After fire resistance test terminates 1 hour, the integrality of cable is checked, the integrity degree of the cable is 45% or so；It is tried in fire resisting Apply the pressure test of voltage rating during testing to cable simultaneously, cable is breakdown；In the case where keeping testing reset condition, The test voltage for applying 3.5U to cable continues 15min, breakdown；After carrying out fire resistance test, the cable is allowed to continue working 24 hours, it is found that the cable can not work substantially；
3. cable proposed by the present invention, when carrying out fire resistance test, flame temperature is 750~800 DEG C, for the fiery time 90min checks the integrality of cable after fire resistance test terminates 1 hour, and the integrity degree of the cable is close to 97%；? Apply the pressure test of voltage rating during fire resistance test to cable simultaneously, cable is not breakdown；It is keeping testing reset condition In the case where, the test voltage for applying 3.5U to cable continues 15min, not breakdown；After carrying out fire resistance test, the electricity is allowed Cable continues working 24 hours, can continue to keep steady operation.
Embodiment 2
In example 2, in the step of manufacturing process of cable is same as Example 1, embodiment 2 with the step of embodiment 1 Suddenly there is following difference:
The drawing step, which refers to, uses diameter to pass through excessively on guy-line equipment for electrician's round copper rod of 8mm high conductivity A mold draws and is annealed into electrician's circular copper wire that diameter is 2.80mm；
The conductor process step, which refers to, carries out process simultaneously on 500 type frame winches for electrician's circular copper wire of 60 2.80mm The round conductor 1 that diameter is 23mm is pressed into layering, and outermost layer twisting pitch is 280mm；Adjacent layer is contrary, outermost Direction of lay is left-hand；
The three-layer co-extruded chemical crosslinking step refers on three-layer co-extruded chemical crosslinking catenary suspension type continuous vulcanization production line while squeezing out Semiconductive conductor shielding 2, crosslinked polyethylene shielding 3, semi-conductive insulation shield 4 simultaneously form insulated wire cores after chemical crosslinking； 85~115 DEG C of extruding machine processing temperature, be crosslinked 260~380 DEG C of pipe temperature, squeeze out semiconductive conductor shielding 2 with a thickness of 0.8mm, crosslinked polyethylene shielding 3 with a thickness of 4.5mm, semi-conductive insulation shield 4 with a thickness of 0.8mm, extruded velocity about 5m/ Min, mold core diameter are 24.5mm, and middle mode diameter is 25.1mm, Case diameter 35.3mm；
5 step of buffer layer refers to that, using 1.2mm, the Semi-conductive buffer band of width 68mm is overlapped around insulated wire cores Surface；
6 step of metallic shield refers to that the soft copper band progress single overlays of width 43mm are wrapped using thickness 0.11mm, Wrapped overlap rate 15%；
7 step of stranding, which refers to, carries out the core after three split-phase metallic shields according to 60 times of twisted diameter of pitch It is twisted, direction of lay dextrad, and it is subject to inflaming retarding high-temperature gasket for packing in core gap, overlapping is around high fire-retardance of double-baging outside cable core Glass fibre band；The width of the high fire-retardance glass fibre band is 70mm；The diameter of the inflaming retarding high-temperature gasket for packing is φ 10mm, oxygen index (OI) OI >=35%, fusing point >=260 DEG C；
8 step of oxygen barrier layer refers on common low smoke and zero halogen extruder, with half plsitive mold, is contracted using low pressure It is than 1.4:1, the common low smoke and zero halogen screw rod that draw ratio is L/D >=20, oxygen index (OI) is oxygen barrier in 36~40 high fire-retardance polyolefin Material is uniformly and intimately extruded in the cable core surface after stranding, squeezes out thickness 2.5mm, and processing temperature is controlled at 80 DEG C~165 DEG C；
First wrapping layer 9 refers to is overlapped the wrapped high fire-retardance glass fibre band with a thickness of 0.5mm outside oxygen barrier layer, Wrapped 2 layers are overlapped, overlap rate 17%；
10 step of fireprotection layer refers on common low smoke and zero halogen extruder, with half plsitive mold, using low pressure It contracts than 1.4:1, the common low smoke and zero halogen screw rod that draw ratio is L/D >=20, ceramic polyolefine material is uniformly and intimately extruded In wrapping layer；Processing temperature is controlled at 140 DEG C~150 DEG C；Squeeze out thickness 5mm；
Second wrapping layer 11 refers to outside fireprotection layer using the high fire-retardance glass fibre band with a thickness of 0.24mm, weight 2 layers of lap wound packet, overlap rate 15%；
The third wrapping layer 13 refers to outside armor using the high fire-retardance glass fibre band with a thickness of 0.25mm, weight 2 layers of lap wound packet, overlap rate 15%；
14 step of oversheath that extrudes refers on common low smoke and zero halogen extruder, with half plsitive mold, uses Low compression ratio 1.4:1, the common low smoke and zero halogen screw rod that draw ratio is L/D >=20, the low smoke and zero halogen of oxygen index (OI) OI >=36% is hindered Combustion 14 material of polyolefin oversheath is uniformly and intimately extruded in formation oversheath 14 in wrapping layer, squeezes out thickness 4.5m, processing temperature Degree control is at 100~150 DEG C.
1. without fireprotection layer 10, oxygen barrier layer 8, buffer layer 5 traditional cable:
For the traditional cable when carrying out fire resistance test, flame temperature is 750~800 DEG C, for fiery time 90min, After fire resistance test terminates 1 hour, the integrality of cable is checked, the integrity degree of the cable is 61% or so；It is tried in fire resisting Apply the pressure test of voltage rating during testing to cable simultaneously, cable is breakdown；In the case where keeping testing reset condition, The test voltage for applying 3.5U to cable continues 15min, breakdown；After carrying out fire resistance test, the cable is allowed to continue working 24 hours, which cannot keep steady operation, and interruption breaks down；
2. without fireprotection layer 10, the second wrapping layer 11, oxygen barrier layer 8, first wrapping layer 9, buffer layer 5, third wrapping layer 13 Traditional cable:
For the traditional cable when carrying out fire resistance test, flame temperature is 750~800 DEG C, for fiery time 90min, After fire resistance test terminates 1 hour, the integrality of cable is checked, the integrity degree of the cable is 45% or so；It is tried in fire resisting Apply the pressure test of voltage rating during testing to cable simultaneously, cable is breakdown；In the case where keeping testing reset condition, The test voltage for applying 3.5U to cable continues 15min, breakdown；After carrying out fire resistance test, the cable is allowed to continue working 24 hours, it is found that the cable can not work substantially；
3. cable proposed by the present invention, when carrying out fire resistance test, flame temperature is 750~800 DEG C, for the fiery time 90min checks the integrality of cable after fire resistance test terminates 1 hour, and the integrity degree of the cable is close to 97%；? Apply the pressure test of voltage rating during fire resistance test to cable simultaneously, cable is not breakdown；It is keeping testing reset condition In the case where, the test voltage for applying 3.5U to cable continues 15min, not breakdown；After carrying out fire resistance test, the electricity is allowed Cable continues working 24 hours, can continue to keep steady operation.
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention.The technology of the industry Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its Equivalent thereof.

Claims (10)

  1. The midium voltage cable manufacturing method 1. a kind of ceramic polyolefin is prevented fires, it is characterised in that: the manufacturing method of the cable is as follows: it draws Silk → conductor process → three-layer co-extruded chemical crosslinking → buffer layer → metallic shield → stranding → oxygen barrier layer → first wrapping layer → Fireprotection layer → the second wrapping layer → armor → third wrapping layer → extrudes oversheath → performance detection；
    The three-layer co-extruded chemical crosslinking refers on three-layer co-extruded chemical crosslinking catenary suspension type continuous vulcanization production line while squeezing out semiconductive conductor Shielding, crosslinked polyethylene shielding, semi-conductive insulation shield simultaneously form insulated wire cores after chemical crosslinking, squeeze out semiconductive conductor Shielding with a thickness of 0.8mm, crosslinked polyethylene shielding thickness is 4.5mm, semi-conductive insulation shield with a thickness of 0.8mm；
    The buffer layer refers to that, using thickness 1-1.5mm, the Semi-conductive buffer band of width 60-70mm is overlapped around insulated wire cores Surface；
    The metallic shield refers to that the copper strips that width is 40-45mm carries out wrapped using with a thickness of 0.1-0.12mm；
    The stranding, which refers to, is twisted three cores after metallic shield, and inflaming retarding high-temperature is added in the gap of core Gasket for packing, the diameter of the inflaming retarding high-temperature gasket for packing are φ 8-15mm, oxygen index (OI) OI >=35%, fusing point >=260 DEG C, stranding it Overlapping is 30- around high fire-retardance glass fibre band of double-baging, the width of the high fire-retardance glass fibre band outside cable core afterwards 80mm；
    The oxygen barrier layer, which refers to, to be uniformly and intimately extruded in stranding with a thickness of the high fire-retardance polyolefin oxygen barrier material of 1.5-2.8mm Core surface afterwards, processing temperature are 80 DEG C -165 DEG C；
    First wrapping layer refers to the high fire-retardance glass fibre for being overlapped that wrapped multi-layered thickness is 0.15-0.52mm outside oxygen barrier layer Band；
    The fireprotection layer, which refers to, uses screw rod of the compression ratio for 1.1:1-1.5:1, draw ratio more than or equal to 20 will be with a thickness of The ceramic polyolefine material of 4.5mm-5mm is uniformly and intimately extruded in the first wrapping layer；
    Second wrapping layer refers to the high fire-retardance glass fiber package that wrapped multi-layered thickness is 0.15-0.25mm outside fireprotection layer Band；
    The armor refer to by with a thickness of the metal tape of 0.25-0.40mm carry out Double-layer gap it is wrapped or by diameter be 0.8- The wire of 1.2mm carries out single layer and is spirally wound on outside the second wrapping layer；
    The third wrapping layer refers to the high fire-retardance glass fiber package that wrapped multi-layered thickness is 0.15-0.25mm outside armor Band；
    It is described to extrude that oversheath refers to using low compression ratio 1.1:1-1.2:1 and screw rod of the draw ratio more than or equal to 20 be with a thickness of The low smoke halogen-free flame-retardant polyolefin jacket material of 4.3-4.5mm is uniformly and intimately extruded in wrapping layer.
  2. The midium voltage cable manufacturing method 2. ceramic polyolefin according to claim 1 is prevented fires, it is characterised in that: the wire drawing Refer to that using diameter to draw by multiple molds on guy-line equipment for electrician's round copper rod of 8mm and be annealed into diameter is 2.56-2.9mm electrician's copper wire.
  3. The midium voltage cable manufacturing method 3. ceramic polyolefin according to claim 2 is prevented fires, it is characterised in that: the conductor Process refers to that electrician's copper wire by 48-60 root 2.56mm-2.9mm carries out process and be layered pressing into diameter and being on frame winch 18.6-23.5mm round conductor.
  4. The midium voltage cable manufacturing method 4. ceramic polyolefin according to claim 3 is prevented fires, it is characterised in that: described three layers The extruding machine processing temperature of co-extrusion chemical crosslinking is 85~115 DEG C, is crosslinked 260~380 DEG C of pipe temperature, extruded velocity about 5- 7m/min, mold core diameter are 19.4-24.5mm, and middle mode diameter is 20.2-25.1mm, Case diameter 30.4-35.3mm.
  5. The midium voltage cable manufacturing method 5. ceramic polyolefin according to claim 4 is prevented fires, it is characterised in that: the stranding In three cores be twisted according to 30-60 times of twisted diameter of pitch.
  6. The midium voltage cable manufacturing method 6. ceramic polyolefin according to claim 1 is prevented fires, it is characterised in that: described fire-retardant The diameter of high temperature packing rope is φ 12mm, oxygen index (OI) OI >=35%, fusing point >=260 DEG C.
  7. The midium voltage cable manufacturing method 7. ceramic polyolefin according to claim 5 or 6 is prevented fires, it is characterised in that: described Oxygen barrier layer refers on low smoke and zero halogen extruder, with half plsitive mold, uses low compression ratio 1.1:1~1.5:1, draw ratio L/ Oxygen index (OI) is uniformly and intimately extruded in by the low smoke and zero halogen screw rod of D >=20 in 36~40 high fire-retardance polyolefin oxygen barrier material Cable core surface after cable, processing temperature are controlled at 80 DEG C~165 DEG C.
  8. The midium voltage cable manufacturing method 8. ceramic polyolefin according to claim 7 is prevented fires, it is characterised in that: the fire prevention Layer step refers on low smoke and zero halogen extruder, with half plsitive mold, use low compression ratio 1.1:1~1.2:1, draw ratio for The common low smoke and zero halogen screw rod of L/D >=20, ceramic polyolefine material is uniformly and intimately extruded in wrapping layer, processing temperature Control is at 140 DEG C~150 DEG C.
  9. The midium voltage cable manufacturing method 9. ceramic polyolefin according to claim 8 is prevented fires, it is characterised in that: described to extrude Oversheath step refers on low smoke and zero halogen extruder, with half plsitive mold, using low compression ratio 1.1:1~1.5:1, major diameter Than the common low smoke and zero halogen screw rod for L/D >=20, by the low smoke halogen-free flame-retardant polyolefin jacket material of oxygen index (OI) OI >=36% It is uniformly and intimately extruded in wrapping layer and forms oversheath, processing temperature is controlled at 100~150 DEG C.
  10. The midium voltage cable manufacturing method 10. ceramic polyolefin according to claim 9 is prevented fires, it is characterised in that: the property Energy detecting step, which refers to, detects the electrical property of product, mechanical performance, fire resistance using cable special inspecting equipment.
CN201910540686.6A 2019-06-21 2019-06-21 A kind of ceramic polyolefin fire prevention midium voltage cable manufacturing method Pending CN110136892A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112038001A (en) * 2020-08-27 2020-12-04 尚纬股份有限公司 Manufacturing method of single-phase alternating current fireproof high-voltage cable for railway engineering
CN112271032A (en) * 2020-11-16 2021-01-26 四川新蓉电缆有限责任公司 Processing method of halogen-free low-smoke flame-retardant B1-grade cable
CN113096871A (en) * 2021-04-14 2021-07-09 固达电线电缆(集团)有限公司 Processing technology of fire-resistant medium-voltage power cable

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Publication number Priority date Publication date Assignee Title
CN206225043U (en) * 2016-11-23 2017-06-06 上海凯波特种电缆料厂有限公司 A kind of ceramic fire-resisting cable
CN208335828U (en) * 2018-07-06 2019-01-04 西安西电光电缆有限责任公司 Fire-resisting cable is pressed in one kind
CN109448921A (en) * 2018-11-19 2019-03-08 尚纬股份有限公司 A kind of manufacturing method of inorganic fire medium and high voltage cable

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN206225043U (en) * 2016-11-23 2017-06-06 上海凯波特种电缆料厂有限公司 A kind of ceramic fire-resisting cable
CN208335828U (en) * 2018-07-06 2019-01-04 西安西电光电缆有限责任公司 Fire-resisting cable is pressed in one kind
CN109448921A (en) * 2018-11-19 2019-03-08 尚纬股份有限公司 A kind of manufacturing method of inorganic fire medium and high voltage cable

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112038001A (en) * 2020-08-27 2020-12-04 尚纬股份有限公司 Manufacturing method of single-phase alternating current fireproof high-voltage cable for railway engineering
CN112271032A (en) * 2020-11-16 2021-01-26 四川新蓉电缆有限责任公司 Processing method of halogen-free low-smoke flame-retardant B1-grade cable
CN113096871A (en) * 2021-04-14 2021-07-09 固达电线电缆(集团)有限公司 Processing technology of fire-resistant medium-voltage power cable

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Application publication date: 20190816