CN102938275A - Production method of fireproof middle and high voltage cables - Google Patents
Production method of fireproof middle and high voltage cables Download PDFInfo
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- CN102938275A CN102938275A CN2012104661644A CN201210466164A CN102938275A CN 102938275 A CN102938275 A CN 102938275A CN 2012104661644 A CN2012104661644 A CN 2012104661644A CN 201210466164 A CN201210466164 A CN 201210466164A CN 102938275 A CN102938275 A CN 102938275A
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- 238000001125 extrusion Methods 0.000 claims abstract description 51
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- 239000004020 conductor Substances 0.000 claims abstract description 46
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 24
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- 230000004888 barrier function Effects 0.000 claims description 62
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- 230000009970 fire resistant effect Effects 0.000 claims description 36
- 238000000034 method Methods 0.000 claims description 36
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- 229920001971 elastomer Polymers 0.000 claims description 21
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 17
- 229910052802 copper Inorganic materials 0.000 claims description 17
- 239000010949 copper Substances 0.000 claims description 17
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 16
- 239000005864 Sulphur Substances 0.000 claims description 16
- 238000012545 processing Methods 0.000 claims description 15
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- 239000003063 flame retardant Substances 0.000 claims description 11
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- 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 description 9
- 230000015556 catabolic process Effects 0.000 claims description 8
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- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 6
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 6
- 239000008397 galvanized steel Substances 0.000 claims description 6
- 229920000260 silastic Polymers 0.000 claims description 6
- 229920002379 silicone rubber Polymers 0.000 claims description 6
- 239000004945 silicone rubber Substances 0.000 claims description 6
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 5
- 238000005538 encapsulation Methods 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 238000004804 winding Methods 0.000 claims description 5
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- 238000010008 shearing Methods 0.000 description 3
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- 229920001187 thermosetting polymer Polymers 0.000 description 3
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- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
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- 229910052618 mica group Inorganic materials 0.000 description 1
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- DXZMANYCMVCPIM-UHFFFAOYSA-L zinc;diethylphosphinate Chemical compound [Zn+2].CCP([O-])(=O)CC.CCP([O-])(=O)CC DXZMANYCMVCPIM-UHFFFAOYSA-L 0.000 description 1
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Abstract
The invention discloses a production method of fireproof middle and high voltage cables. The production method includes the following steps: sorting; wire drawing; annealing; conductor stranding; inner shielding layer, insulation layer and outer shielding layer co-extrusion and warping; metal shielding layer arranging; first wrapping tape layer lapping; cabling stranding and cabling wrapping tape layer lapping; oxygen isolation layer extrusion; package fireproof isolation layer extrusion; second wrapping tape layer lapping; metal armor layer lapping; third wrapping tape layer lapping and outer sheath layer extrusion. The middle and high voltage cables produced in the production method have good heat insulation effect when being paved on buildings, are improved in fireproof performance, can delay damage to a power system caused by fire disasters, natural disasters and other accidents, and gains time for rescue.
Description
Technical field
The present invention relates to the cables manufacturing technical field, particularly relate to a kind of fire-resistant medium and high voltage cable manufacture method.
Background technology
Entered for 21st century, the infrastructure of China has entered the gold period of building, and in today of population and the rapid expansion of urbanization, in order to economize on resources, urban construction is had to clustering, scale and high stratification development.The country of emphasis such as station, airport, subway, nuclear power station, commercial hotel, hospital, shopping plaza, residential building and people's livelihood engineering are except needs are considered the comfortableness of the Function and environment that it is indispensable, fail safe is more and more brought into schedule, and Shanghai " 11.15 " wildfire accident has brought people very deep caution.Fire-resisting cable is as special cable, is applied to occasion that coefficient of safety is had relatively high expectations, has been subject to the extensive approval of client and society.
Along with the continuous high stratification of building and clustering, the electric power transfer capacity is also increasing, transformation system need to be arranged on the building, thereby shorten the transmission range of main loop cabling, reduce the voltage drop of main loop cabling and the electric energy loss in the electric power transfer process, require the path of laying of a part of medium-pressure or high pressure cable is extended to transformation system on the building.Therefore, one section medium-pressure or high pressure cable on the building that is laid in requires to have certain fire resistance, can greatly delay because the burst accidents such as fire to the destruction of electric power system.
Traditional fire-resisting cable is mainly take low-voltage cable as main, and basic structure is wrapped inorganic mica tape on conductor, prevents that within a certain period of time cable from opening circuit under thermal-flame.Yet this structure is not suitable for the middle high-pressure cable of fire-resistant requirement, because it can not solve the balance between middle high-pressure cable electrical property and the fire resistance.And the middle pressure fire-resisting cable that existing market occurs, most of employing is crosslinked polyetylene insulated, in fire situation, its crosslinked polyetylene insulated meeting was melted because of excess Temperature in the short period (can't be up to state standards 90 minutes that stipulate), lose insulating effect, cause the cable thermal breakdown, lose its function, fail really to play the effect of fire-resisting cable.
For example application number is CN201120346417.5; publication number is the Chinese patent " a kind of fire safe type medium and high voltage cable " of CN202258494U; a kind of fire safe type medium and high voltage cable is disclosed; comprise several insulated electric conductors; the stranded formation cable core of several insulated electric conductors; the cable core outside is enclosed with refractory heat-insulating combined protection layer; refractory heat-insulating combination fireprotection layer consists of by three layers; internal layer is the insulation protective jacket that extrudes moulding; inferior skin is the thermal insulation gear fire bed of wrapped formation; outer for extruding the fire-resisting protection layer of moulding, refractory heat-insulating combination fireprotection layer extrusion moulding has restrictive coating.The weak point of this patent is: this body structure of cable is too simple, and effect of heat insulation is poor, and fire resistance period is short, and fire resistance is also poor, under the destruction of the burst accidents such as fire, natural calamity to electric power system, can not gain time for rescue work well.
Summary of the invention
The object of the invention is to overcome the problems referred to above that prior art exists, propose a kind of fire-resistant medium and high voltage cable manufacture method.Adopt the produced cable laying of method of the present invention to have good effect of heat insulation at building, improved the fire resistance of cable, can delay because of the destruction of the burst accidents such as fire, natural calamity to electric power system, for rescue work gains time.
The present invention realizes by the following technical solutions:
A kind of fire-resistant medium and high voltage cable manufacture method, comprise the steps: to select materials → wire drawing → annealing → conductor is stranded → internal shield, the co-extrusion of insulating barrier and outer shielding layer and coating → metal screen layer setting → first belting layer is wrapped → stranding stranded with the stranding belting layer wrapped → oxygen barrier layer extrudes → the fire-resistant separator of turnkey extrudes → the second belting layer is wrapped → the metal armouring layer is wrapped → the 3rd belting layer is wrapped → external sheath layer extrudes, it is characterized in that: the described oxygen barrier layer step extrudes and suddenly refers to adopt plsitive mold at extrusion apparatus, the screw rod that with compression ratio is 1.25:1～2.0:1 is that 32～40 high flame retardant polyolefine material is extruded on the stranding belting layer with oxygen index, extruding thickness is 2.0mm～5.0mm, and processing temperature is 80 ℃～165 ℃; The fire-resistant separator of described turnkey extrudes step and refers to adopt Teh Extrusion Press for Extruding Silicone Rubber Products that the ceramic silastic material is extruded on the oxygen barrier layer, and extruding thickness is 3.0mm～5.0mm.
Described conductor twisting step refers to that the multiply tin-coated copper monofilament that forms is that 10-16 times of length of stranded conductor diameter length is twisted into conductor according to twisting pitch behind wire-drawing process.
Described stranding twisting step refer to through selecting materials → wire drawing → annealing → conductor is stranded → co-extrusion of internal shield, insulating barrier and outer shielding layer and after coating → metal screen layer setting → the first belting layer is wrapped many cores of formation be twisted into one; It is that the glass fiber tape of 0.20mm～0.40mm is formed into the cable wrap belt after on the stranded all-in-one-piece core overlapping wrapped 1 layer～4 layers that the wrapped step of described stranding belting layer refers to adopt thickness, and the wrapped rate of putting up is 10%～50%; Fill with packed layer in space between many cores.
The co-extrusion step of described internal shield, insulating barrier and outer shielding layer refers to adopt the semiconducting rubber material as the material of internal shield and outer shielding layer, adopts hard ethylene-propylene rubber material as the material of insulating barrier; And adopt three-layer co-extruded rubber cover to connect sulphur equipment and extrude simultaneously internal shield, insulating barrier, outer shielding layer, the rubber extruding machine processing temperature is 50～100 ℃, and connecting sulphur pipeline steam pressure is 0.5Mpa～1.6Mpa, and extrusion linear speed is 3m/min～15m/min; The encapsulation steps of described internal shield, insulating barrier and outer shielding layer refers to that co-extrusion rubber cover even sulphur equipment is extruded internal shield, insulating barrier, outer shielding layer simultaneously to be coated on through the stranded conductor that forms peripheral from inside to outside successively.
It is that the soft copper band individual layer of 0.10mm～0.15mm is overlapping wrapped in external shield that described metal screen layer setting steps refers to adopt thickness, and the wrapped rate of putting up is 15%～20%; Or to adopt diameter be that the soft copper silk of 0.20mm～0.40mm is woven in the external shield, and count is 70%～90%.
The wrapped step of described the first belting layer, the wrapped step of the second belting layer and the wrapped step of the 3rd belting layer all refer at lapping equipment thickness to be overlapping wrapped 1 layer～4 layers of the glass fiber tape of 0.20mm～0.40mm, the first belting layer, the second belting layer and the 3rd belting layer are wrapped on metal screen layer, the fire-resistant separator of turnkey and metal armouring layer respectively, and the wrapped rate of putting up is 10%～50%.
It is that the galvanized steel strip double-layer spiral gap of 0.2 mm～0.8mm is wrapped on the second belting layer that the wrapped step of described metal armouring layer refers to adopt thickness, or to adopt diameter be that the zinc-coated wire spiral winding of 1.25mm～6.0mm wraps on the second belting layer.
Described external sheath layer extrudes step and refers at extrusion apparatus half plsitive mold, is that the screw rod of 1.25:1～2.0:1 is extruded in low-smoke halide-free fireproof composite polyolefine material on the 3rd belting layer and forms external sheath layer with compression ratio, and processing temperature is 100～175 ℃.
Also be included in external sheath layer and extrude service check experimental procedure and the finished product packing warehouse-in step of carrying out after the step, described service check experimental procedure comprises conductor DC resistance test, power frequency withstand test and fire resistance test; Described fire resistance test refers to adopt two blowtorch, and flame temperature is 750～800 ℃, and it is the withstand voltage test of 6～35kV that duration of test applies the specified pressure of cable simultaneously, and test duration is 90min; After the service check experiment, there is not breakdown cable to form finished product.
Described finished product packing warehouse-in step refers to and will pack warehouse-in by the finished product of performance checking procedure.
The present invention compared with prior art, its advantage is:
1, the present invention is provided with the fire-resistant separator of turnkey simultaneously, and all adopting Teh Extrusion Press for Extruding Silicone Rubber Products to carry out the ceramic silastic material extrudes, material has good effect of heat insulation, sinter the ceramic body into through high temperature or flame, because ceramic body main material composition is inorganic silicon, the mechanical strength of the cable that therefore produces is enhanced, has promoted electrical insulation properties, improves the fire resistance of cable.
2, the present invention adopts the conductor twisting step to refer to that the multiply tin-coated copper monofilament that forms is that 10-16 times of length of stranded conductor diameter length is twisted into conductor according to twisting pitch behind wire-drawing process; Compact with the conductor structure that the method is made, the profile rounding, and bending property is good.
3, the present invention adopts three-layer co-extruded rubber cover to connect sulphur equipment and extrudes simultaneously insulation internal shield, insulating barrier, insulation outer shielding layer, and the cable that this three-layer co-extruded mode makes has very high electric insulating quality; Adopt again hard ethylene-propylene rubber material to replace traditional crosslinked polyethylene as insulating barrier, and the third insulation of hard second can crosslinked polyetylene insulatedly not melted because of excess Temperature as commonly used when fire situation, lose insulating effect, cause the cable thermal breakdown, adhere to that in fire situation the time is greater than 90min; Can delay greatly to have improved the fire resistance of cable, for rescue work gains time because of the destruction of the burst accidents such as fire, natural calamity to electric power system.
4, the oxygen barrier layer of the present invention cable that adopts extrusion way to make has very high anti-flammability, can prevent effectively that cable from further prolonging combustion in fire situation, greatly protects the electric property of inner insulation layer, improves the fire resistance of cable.
5, to adopt the metal screen layer setting steps to refer to adopt thickness be that the soft copper band individual layer of 0.10mm～0.15mm is overlapping wrapped in external shield in the present invention, and the wrapped rate of putting up is 15%～20%; Or to adopt diameter be that the soft copper silk of 0.20mm～0.40mm is woven in the external shield, and count is 70%～90%; Can strengthen and the effect of restriction electric field in insulation, make direction of an electric field along the insulation radial direction, can bear unsymmetrical current and short circuit current simultaneously.
6, the wrapped step of the first belting layer, the wrapped step of the second belting layer and the wrapped step of the 3rd belting layer that adopt of the present invention all refers at lapping equipment thickness to be overlapping wrapped 1 layer～4 layers of the glass fiber tape of 0.20mm～0.40mm, the first belting layer, the second belting layer and the 3rd belting layer are wrapped on metal screen layer, the fire-resistant separator of turnkey and metal armouring layer respectively, and the wrapped rate of putting up is 10%～50%; Not only play traditional coating and tighten effect, can also greatly improve the fire-retardant and effect of heat insulation of cable, wrapped glass fiber tape at the metal armouring layer also has the sheath of raising anti-cracking performance simultaneously.
7, to refer to adopt thickness be that the galvanized steel strip double-layer spiral gap of 0.2 mm～0.8mm is wrapped on the second belting layer to the wrapped step of metal armouring layer that adopt of the present invention, or to adopt diameter be that the zinc-coated wire spiral winding of 1.25mm～6.0mm wraps on the second belting layer; Not only play traditional resistance to compression, drawing-resistant function, have simultaneously excellent fire performance, effectively stop flame to burn into internal layer.
8, oxygen barrier layer of the present invention extrudes step and oversheath extrudes the screw rod that step all adopts low compression ratio, can satisfy the large particularity of low smoke and zero halogen thermosetting polymer CABLE MATERIALS shearing force, can avoid containing in the low smoke and zero halogen thermosetting polymer CABLE MATERIALS high magnesium hydroxide and the aluminium hydroxide of filling, in extruding process, because frictional force is large, produces a large amount of heats; When also having avoided for low smoke and zero halogen thermosetting polymer CABLE MATERIALS, adopt compression ratio excessive, the situation that need to set up the extrusion equipment with good cooling device.
9, the present invention adopts the low compression ratio Screw Extrusion, can greatly reduce the shearing force in the material extrusion, and the protection extrusion apparatus can be not excessive because of shearing force, causes the excessive and damage equipment of current of electric; Half plsitive mold is extruded, and can not only make cable extrude rear rounding, and the method can effectively be controlled the draw ratio that material is extruded simultaneously, improves the performance of low-smoke and halogen-free flame retardant polyolefin jacket.
10, the present invention adopts the service check experiment, does not have breakdown cable to form finished product after the service check experiment, packs warehouse-in; Breakdown cable is fakement, can not put in storage; The cable fakement rate that adopts method of the present invention to make is low, has saved production cost.
Description of drawings
Fig. 1 is process chart of the present invention
Fig. 2 is the embodiment of the invention 2 process charts
Fig. 3 is structural representation of the present invention
Mark among the figure: 1, conductor; 2, internal shield; 3, insulating barrier; 4, outer shielding layer; 5, metal screen layer; 6, the first belting layer; 7, packed layer; 8, stranding belting layer; 9, oxygen barrier layer; 10, the fire-resistant separator of turnkey; 11, the second belting layer; 12, metal armouring layer; 13, the 3rd belting layer; 14, external sheath layer.
Embodiment
Embodiment 1:
A kind of fire-resistant medium and high voltage cable manufacture method, comprise the steps: to select materials → wire drawing → annealing → conductor is stranded → internal shield, the co-extrusion of insulating barrier and outer shielding layer and coating → metal screen layer setting → first belting layer is wrapped → stranding stranded with the stranding belting layer wrapped → oxygen barrier layer extrudes → the fire-resistant separator of turnkey extrudes → the second belting layer is wrapped → the metal armouring layer is wrapped → the 3rd belting layer is wrapped → external sheath layer extrudes, the described oxygen barrier layer step extrudes and suddenly refers to adopt plsitive mold at extrusion apparatus, the screw rod that with compression ratio is 1.25:1 is that 32 high flame retardant polyolefine material is extruded on the stranding belting layer with oxygen index, extruding thickness is 2.0mm, and processing temperature is 80 ℃; The fire-resistant separator of described turnkey extrudes step and refers to adopt Teh Extrusion Press for Extruding Silicone Rubber Products that the ceramic silastic material is extruded on the oxygen barrier layer, and extruding thickness is 3.0mm.
Among the present invention, described conductor twisting step refers to that the multiply tin-coated copper monofilament that forms is that 10 times of length of stranded conductor diameter length are twisted into conductor according to twisting pitch behind wire-drawing process.
Among the present invention, described stranding twisting step refer to through selecting materials → wire drawing → annealing → conductor is stranded → co-extrusion of internal shield, insulating barrier and outer shielding layer and after coating → metal screen layer setting → the first belting layer is wrapped many cores of formation be twisted into one; It is that the glass fiber tape of 0.20mm overlapping wrapped 1 is formed into the cable wrap belt layer by layer afterwards on stranded all-in-one-piece core that the wrapped step of described stranding belting layer refers to adopt thickness, and the wrapped rate of putting up is 10%; Fill with packed layer in space between many cores.
Among the present invention, the co-extrusion step of described internal shield, insulating barrier and outer shielding layer refers to adopt the semiconducting rubber material as the material of internal shield and outer shielding layer, adopts hard ethylene-propylene rubber material as the material of insulating barrier; And adopt three-layer co-extruded rubber cover to connect sulphur equipment and extrude simultaneously internal shield, insulating barrier, outer shielding layer, the rubber extruding machine processing temperature is 50 ℃, and connecting sulphur pipeline steam pressure is 0.5Mpa, and extrusion linear speed is 3m/min; The encapsulation steps of described internal shield, insulating barrier and outer shielding layer refers to that co-extrusion rubber cover even sulphur equipment is extruded internal shield, insulating barrier, outer shielding layer simultaneously to be coated on through the stranded conductor that forms peripheral from inside to outside successively; Be that internal shield is coated on the conductor, insulating barrier is coated on the internal shield, and outer shielding layer is coated on the insulating barrier.
Among the present invention, it is that the soft copper band individual layer of 0.10mm is overlapping wrapped in external shield that described metal screen layer setting steps refers to adopt thickness, and the wrapped rate of putting up is 15%.
Among the present invention, the wrapped step of described the first belting layer, the wrapped step of the second belting layer and the wrapped step of the 3rd belting layer all refer at lapping equipment thickness to be overlapping wrapped 1 layer of the glass fibre of 0.20mm, the first belting layer, the second belting layer and the 3rd belting layer are wrapped on metal screen layer, the fire-resistant separator of turnkey and metal armouring layer respectively, and the wrapped rate of putting up is 10%.
Among the present invention, it is that the galvanized steel strip double-layer spiral gap of 0.2 mm is wrapped on the second belting layer that the wrapped step of described metal armouring layer refers to adopt thickness.
Among the present invention, described external sheath layer extrudes step and refers at extrusion apparatus half plsitive mold, is that the screw rod of 1.25:1 is extruded in flame retardant polyolefine material on the 3rd belting layer and forms external sheath layer with compression ratio, and processing temperature is 100 ℃.
Embodiment 2:
A kind of fire-resistant medium and high voltage cable manufacture method, comprise the steps: to select materials → wire drawing → annealing → conductor is stranded → internal shield, the co-extrusion of insulating barrier and outer shielding layer and coating → metal screen layer setting → first belting layer is wrapped → stranding stranded with the stranding belting layer wrapped → oxygen barrier layer extrudes → the fire-resistant separator of turnkey extrudes → the second belting layer is wrapped → the metal armouring layer is wrapped → the 3rd belting layer is wrapped → external sheath layer extrudes → service check experiment → finished product packing puts in storage, the described oxygen barrier layer step extrudes and suddenly refers to adopt plsitive mold at extrusion apparatus, the screw rod that with compression ratio is 1.25:1 is that 35 high flame retardant polyolefine material is extruded on the stranding belting layer with oxygen index, extruding thickness is 4.0mm, and processing temperature is 120 ℃; The fire-resistant separator of described turnkey extrudes step and refers to adopt Teh Extrusion Press for Extruding Silicone Rubber Products that the ceramic silastic material is extruded on the oxygen barrier layer, and extruding thickness is 4.0mm.
Among the present invention, described conductor twisting step refers to that the multiply tin-coated copper monofilament that forms is that 13 times of length of stranded conductor diameter length are twisted into conductor according to twisting pitch behind wire-drawing process.
Among the present invention, described stranding twisting step refer to through selecting materials → wire drawing → annealing → conductor is stranded → co-extrusion of internal shield, insulating barrier and outer shielding layer and after coating → metal screen layer setting → the first belting layer is wrapped many cores of formation be twisted into one; It is that the glass fiber tape of 0.30mm overlapping wrapped 2 is formed into the cable wrap belt layer by layer afterwards on stranded all-in-one-piece core that the wrapped step of described stranding belting layer refers to adopt thickness, and the wrapped rate of putting up is 30%; Fill with packed layer in space between many cores.
Among the present invention, the co-extrusion step of described internal shield, insulating barrier and outer shielding layer refers to adopt the semiconducting rubber material as the material of internal shield and outer shielding layer, adopts hard ethylene-propylene rubber material as the material of insulating barrier; And adopt three-layer co-extruded rubber cover to connect sulphur equipment and extrude simultaneously internal shield, insulating barrier, outer shielding layer, the rubber extruding machine processing temperature is 80 ℃, and connecting sulphur pipeline steam pressure is 1.0Mpa, and extrusion linear speed is 6m/min; The encapsulation steps of described internal shield, insulating barrier and outer shielding layer refers to that co-extrusion rubber cover even sulphur equipment is extruded internal shield, insulating barrier, outer shielding layer simultaneously to be coated on through the stranded conductor that forms peripheral from inside to outside successively; Be that internal shield is coated on the conductor, insulating barrier is coated on the internal shield, and outer shielding layer is coated on the insulating barrier.
Among the present invention, it is that the soft copper band individual layer of 0.12mm is overlapping wrapped in external shield that described metal screen layer setting steps refers to adopt thickness, and the wrapped rate of putting up is 18%.
Among the present invention, the wrapped step of described the first belting layer, the wrapped step of the second belting layer and the wrapped step of the 3rd belting layer all refer at lapping equipment thickness to be overlapping wrapped 2 layers of the glass fibre of 0.30mm, the first belting layer, the second belting layer and the 3rd belting layer are wrapped on metal screen layer, the fire-resistant separator of turnkey and metal armouring layer respectively, and the wrapped rate of putting up is 30%.
Among the present invention, it is that the galvanized steel strip double-layer spiral gap of 0.5 mm is wrapped on the second belting layer that the wrapped step of described metal armouring layer refers to adopt thickness.
Among the present invention, described external sheath layer extrudes step and refers at extrusion apparatus half plsitive mold, is that the screw rod of 1.25:1 is extruded in flame retardant polyolefine material on the 3rd belting layer and forms external sheath layer with compression ratio, and processing temperature is 150 ℃.
Among the present invention, described service check experiment comprises conductor DC resistance test, power frequency withstand test and fire resistance test; Described fire resistance test refers to adopt two blowtorch, and flame temperature is 750 ℃, and it is the withstand voltage test of 6kV that duration of test applies the specified pressure of cable simultaneously, and test duration is 90min; After the service check experiment, there is not breakdown cable to form finished product.
Among the present invention, described finished product packing warehouse-in step refers to and will pack warehouse-in by the finished product of performance checking procedure.
Embodiment 3:
A kind of fire-resistant medium and high voltage cable manufacture method, comprise the steps: to select materials → wire drawing → annealing → conductor is stranded → internal shield, the co-extrusion of insulating barrier and outer shielding layer and coating → metal screen layer setting → first belting layer is wrapped → stranding stranded with the stranding belting layer wrapped → oxygen barrier layer extrudes → the fire-resistant separator of turnkey extrudes → the second belting layer is wrapped → the metal armouring layer is wrapped → the 3rd belting layer is wrapped → external sheath layer extrudes → service check experiment → finished product packing puts in storage, the described oxygen barrier layer step extrudes and suddenly refers to adopt plsitive mold at extrusion apparatus, the screw rod that with compression ratio is 2.0:1 is that 40 high flame retardant polyolefine material is extruded on the stranding belting layer with oxygen index, extruding thickness is 5.0mm, and processing temperature is 165 ℃; The fire-resistant separator of described turnkey extrudes step and refers to adopt Teh Extrusion Press for Extruding Silicone Rubber Products that the ceramic silastic material is extruded on the oxygen barrier layer, and extruding thickness is 5.0mm.
Among the present invention, described conductor twisting step refers to that the multiply tin-coated copper monofilament that forms is that 16 times of length of stranded conductor diameter length are twisted into conductor according to twisting pitch behind wire-drawing process.
Among the present invention, described stranding twisting step refer to through selecting materials → wire drawing → annealing → conductor is stranded → co-extrusion of internal shield, insulating barrier and outer shielding layer and after coating → metal screen layer setting → the first belting layer is wrapped many cores of formation be twisted into one; It is that the glass fiber tape of 0.40mm overlapping wrapped 4 is formed into the cable wrap belt layer by layer afterwards on stranded all-in-one-piece core that the wrapped step of described stranding belting layer refers to adopt thickness, and the wrapped rate of putting up is 50%; Fill with packed layer in space between many cores.
Among the present invention, the co-extrusion step of described internal shield, insulating barrier and outer shielding layer refers to adopt the semiconducting rubber material as the material of internal shield and outer shielding layer, adopts hard ethylene-propylene rubber material as the material of insulating barrier; And adopt three-layer co-extruded rubber cover to connect sulphur equipment and extrude simultaneously internal shield, insulating barrier, outer shielding layer, the rubber extruding machine processing temperature is 100 ℃, and connecting sulphur pipeline steam pressure is 1.6Mpa, and extrusion linear speed is 15m/min; The encapsulation steps of described internal shield, insulating barrier and outer shielding layer refers to that co-extrusion rubber cover even sulphur equipment is extruded internal shield, insulating barrier, outer shielding layer simultaneously to be coated on through the stranded conductor that forms peripheral from inside to outside successively; Be that internal shield is coated on the conductor, insulating barrier is coated on the internal shield, and outer shielding layer is coated on the insulating barrier.
Among the present invention, it is that the soft copper band individual layer of 0.15mm is overlapping wrapped in external shield that described metal screen layer setting steps refers to adopt thickness, and the wrapped rate of putting up is 20%.
Among the present invention, the wrapped step of described the first belting layer, the wrapped step of the second belting layer and the wrapped step of the 3rd belting layer all refer at lapping equipment thickness to be overlapping wrapped 4 layers of the glass fibre of 0.40mm, the first belting layer, the second belting layer and the 3rd belting layer are wrapped on metal screen layer, the fire-resistant separator of turnkey and metal armouring layer respectively, and the wrapped rate of putting up is 50%.
Among the present invention, it is that the galvanized steel strip double-layer spiral gap of 0.8mm is wrapped on the second belting layer that the wrapped step of described metal armouring layer refers to adopt thickness.
Among the present invention, described external sheath layer extrudes step and refers at extrusion apparatus half plsitive mold, is that the screw rod of 2.0:1 is extruded in flame retardant polyolefine material on the 3rd belting layer and forms external sheath layer with compression ratio, and processing temperature is 175 ℃.
Among the present invention, described service check experiment comprises conductor DC resistance test, power frequency withstand test and fire resistance test; Described fire resistance test refers to adopt two blowtorch, and flame temperature is 800 ℃, and it is the withstand voltage test of 35kV that duration of test applies the specified pressure of cable simultaneously, and test duration is 90min; After the service check experiment, there is not breakdown cable to form finished product.
Among the present invention, described finished product packing warehouse-in step refers to and will pack warehouse-in by the finished product of performance checking procedure.
Embodiment 4:
Be with embodiment 1,2,3 difference: it is that the soft copper silk of 0.20mm is woven in the external shield that described metal screen layer setting steps refers to adopt diameter, and count is 70%; It is that the zinc-coated wire spiral winding of 1.25mm wraps on the second belting layer that the wrapped step of described metal armouring layer refers to adopt diameter.
Embodiment 5:
Be with embodiment 1,2,3,4 difference: it is that the soft copper silk of 0.40mm is woven in the external shield that described metal screen layer setting steps refers to adopt diameter, and count is 90%.It is that the zinc-coated wire spiral winding of 6.0mm wraps on the second belting layer that the wrapped step of described metal armouring layer refers to adopt diameter.
The invention is not restricted to above-described embodiment, the combination in the above-mentioned process parameters range changes all in protection scope of the present invention.
Claims (10)
1. fire-resistant medium and high voltage cable manufacture method, comprise the steps: to select materials → wire drawing → annealing → conductor is stranded → internal shield, the co-extrusion of insulating barrier and outer shielding layer and coating → metal screen layer setting → first belting layer is wrapped → stranding stranded with the stranding belting layer wrapped → oxygen barrier layer extrudes → the fire-resistant separator of turnkey extrudes → the second belting layer is wrapped → the metal armouring layer is wrapped → the 3rd belting layer is wrapped → external sheath layer extrudes, it is characterized in that: the described oxygen barrier layer step extrudes and suddenly refers to adopt plsitive mold at extrusion apparatus, the screw rod that with compression ratio is 1.25:1～2.0:1 is that 32～40 high flame retardant polyolefine material is extruded on the stranding belting layer with oxygen index, extruding thickness is 2.0mm～5.0mm, and processing temperature is 80 ℃～165 ℃; The fire-resistant separator of described turnkey extrudes step and refers to adopt Teh Extrusion Press for Extruding Silicone Rubber Products that the ceramic silastic material is extruded on the oxygen barrier layer, and extruding thickness is 3.0mm～5.0mm.
2. a kind of fire-resistant medium and high voltage cable manufacture method according to claim 1 is characterized in that: described conductor twisting step refers to that the multiply tin-coated copper monofilament that forms is that 10-16 times of length of stranded conductor diameter length is twisted into conductor according to twisting pitch behind wire-drawing process.
3. a kind of fire-resistant medium and high voltage cable manufacture method according to claim 1 and 2, it is characterized in that: the co-extrusion step of described internal shield, insulating barrier and outer shielding layer refers to adopt the semiconducting rubber material as the material of internal shield and outer shielding layer, adopts hard ethylene-propylene rubber material as the material of insulating barrier; And adopt three-layer co-extruded rubber cover to connect sulphur equipment and extrude simultaneously internal shield, insulating barrier, outer shielding layer, the rubber extruding machine processing temperature is 50～100 ℃, and connecting sulphur pipeline steam pressure is 0.5Mpa～1.6Mpa, and extrusion linear speed is 3m/min～15m/min; The encapsulation steps of described internal shield, insulating barrier and outer shielding layer refers to that co-extrusion rubber cover even sulphur equipment is extruded internal shield, insulating barrier, outer shielding layer simultaneously to be coated on through the stranded conductor that forms peripheral from inside to outside successively.
4. a kind of fire-resistant medium and high voltage cable manufacture method according to claim 1, it is characterized in that: it is that the soft copper band individual layer of 0.10mm～0.15mm is overlapping wrapped in external shield that described metal screen layer setting steps refers to adopt thickness, and the wrapped rate of putting up is 15%～20%; Or to adopt diameter be that the soft copper silk of 0.20mm～0.40mm is woven in the external shield, and count is 70%～90%.
5. a kind of fire-resistant medium and high voltage cable manufacture method according to claim 1, it is characterized in that: the wrapped step of described the first belting layer, the wrapped step of the second belting layer and the wrapped step of the 3rd belting layer all refer at lapping equipment thickness to be overlapping wrapped 1 layer～4 layers of the glass fiber tape of 0.20mm～0.40mm, the first belting layer, the second belting layer and the 3rd belting layer are wrapped on metal screen layer, the fire-resistant separator of turnkey and metal armouring layer respectively, and the wrapped rate of putting up is 10%～50%.
6. a kind of fire-resistant medium and high voltage cable manufacture method according to claim 5 is characterized in that: it is that the galvanized steel strip double-layer spiral gap of 0.2 mm～0.8mm is wrapped on the second belting layer that the wrapped step of described metal armouring layer refers to adopt thickness; Or to adopt diameter be that the zinc-coated wire spiral winding of 1.25mm～6.0mm wraps on the second belting layer.
7. a kind of fire-resistant medium and high voltage cable manufacture method according to claim 6, it is characterized in that: described external sheath layer extrudes step and refers at extrusion apparatus half plsitive mold, be that the screw rod of 1.25:1～2.0:1 is extruded in flame retardant polyolefine material on the 3rd belting layer and forms external sheath layer with compression ratio, processing temperature is 100～175 ℃.
8. a kind of fire-resistant medium and high voltage cable manufacture method according to claim 1, it is characterized in that: also be included in external sheath layer and extrude service check experimental procedure and the finished product packing warehouse-in step of carrying out after the step, described service check experiment comprises conductor DC resistance test, power frequency withstand test and fire resistance test; Described fire resistance test refers to adopt two blowtorch, and flame temperature is 750～800 ℃, and it is the withstand voltage test of 6～35kV that duration of test applies the specified pressure of cable simultaneously, and test duration is 90min; After the service check experiment, there is not breakdown cable to form finished product.
9. a kind of fire-resistant medium and high voltage cable manufacture method according to claim 8 is characterized in that: described finished product packing warehouse-in step refers to and will pack warehouse-in by the finished product of performance checking procedure.
10. a kind of fire-resistant medium and high voltage cable manufacture method according to claim 1 is characterized in that: described stranding twisting step refer to through selecting materials → wire drawing → annealing → conductor is stranded → co-extrusion of internal shield, insulating barrier and outer shielding layer and after coating → metal screen layer setting → the first belting layer is wrapped many cores of formation be twisted into one; It is that the glass fiber tape of 0.20mm～0.40mm is formed into the cable wrap belt after on the stranded all-in-one-piece core overlapping wrapped 1 layer～4 layers that the wrapped step of described stranding belting layer refers to adopt thickness, and the wrapped rate of putting up is 10%～50%; Fill with packed layer in space between many cores.
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Denomination of invention: A manufacturing method for fire-resistant medium and high voltage cables Effective date of registration: 20231201 Granted publication date: 20150812 Pledgee: Leshan City Commercial Bank Limited by Share Ltd. Sales Department Pledgor: SUNWAY Co.,Ltd. Registration number: Y2023980068812 |
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