CN102938276B - The fire-resistant medium and high voltage cable manufacture method of a kind of safety-type - Google Patents
The fire-resistant medium and high voltage cable manufacture method of a kind of safety-type Download PDFInfo
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- CN102938276B CN102938276B CN201210466619.2A CN201210466619A CN102938276B CN 102938276 B CN102938276 B CN 102938276B CN 201210466619 A CN201210466619 A CN 201210466619A CN 102938276 B CN102938276 B CN 102938276B
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- 238000000034 method Methods 0.000 title claims abstract description 28
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Abstract
The invention discloses the fire-resistant medium and high voltage cable manufacture method of a kind of safety-type, comprise the steps: to select materials → co-extrusion of wire drawing → annealing → conductor strand → internal shield, insulating barrier and outer shielding layer and coated → metal screen layer arrange → the fire-resistant separator of phase-splitting extrudes → the first belting layer is wrapped → stranding stranded wrapped with stranding belting layer → oxygen barrier layer extrudes → the fire-resistant separator of turnkey extrudes → the second belting layer is wrapped → metal armor layers is wrapped → the 3rd belting layer is wrapped → external sheath layer extrudes.Adopt the produced medium and high voltage cable of method of the present invention to be laid on building and there is good effect of heat insulation, substantially increase the fire resistance of cable, can delay because the burst accident such as fire, natural calamity is to the destruction of electric power system, for rescue work gains time.
Description
Technical field
The present invention relates to technical field of cable, particularly relate to the fire-resistant medium and high voltage cable manufacture method of a kind of safety-type.
Background technology
Entered for 21st century, the infrastructure of China enters the gold period of construction, and in today that population and urbanization sharply expand, in order to economize on resources, urban construction is had to clustering, scale and high stratification development.The country of the emphasis such as such as station, airport, subway, nuclear power station, commercial hotel, hospital, shopping plaza, residential building and people's livelihood engineering are except needing the comfortableness of the Function and environment considering its indispensability, fail safe is more and more brought into schedule, and Shanghai " 11.15 " wildfire accident band gives people very deep warning.Fire-resisting cable, as special cable, is applied to and requires higher occasion to coefficient of safety, receives the extensive approval of client and society.
Along with the continuous high stratification of building and clustering, power transmission capabilities is also increasing, transformation system is needed to arrange on building, thus shorten the transmission range of main loop cabling, reduce the electric energy loss in the voltage drop of main loop cabling and electric power transfer process, require the path of laying of a part of medium-pressure or high pressure cable to extend to transformation system on building.Therefore, the one section of medium-pressure or high pressure cable needs be laid on building has certain fire resistance, can greatly delay because the burst accident such as fire to the destruction of electric power system.
Traditional fire-resisting cable is mainly based on low-voltage cable, and basic structure is wrapped inorganic mica tape on conductor, prevents cable open circuit under thermal-flame within a certain period of time.But this structure is not suitable for the middle high-pressure cable of fire resistant requirements, because it can not solve the balance between middle high-pressure cable electrical property and fire resistance.And the middle pressure fire-resisting cable that existing market occurs, major part adopts crosslinked polyetylene insulated, in fire situation, in the short period (90 minutes of the regulation that cannot be up to state standards), Yin Wendu is too high and melt in its crosslinked polyetylene insulated meeting, lose insulating effect, cause cable thermal breakdown, lose its function, fail really to play the effect of fire-resisting cable.
Such as application number is CN201120346417.5; publication number is the Chinese patent " a kind of fire safe type medium and high voltage cable " of CN202258494U; disclose a kind of fire safe type medium and high voltage cable; comprise several insulated electric conductor; the stranded formation cable core of several insulated electric conductor; refractory heat-insulating combined protection layer is enclosed with outside cable core; refractory heat-insulating combination fireprotection layer is formed by three layers; internal layer is extrude shaping insulation protective jacket; secondary skin is the thermal insulation gear fire bed of wrapped formation; outer for extruding shaping flame resistant protective layer, 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, at the burst accident such as fire, natural calamity under the destruction of electric power system, and can not well for rescue work gains time.
Summary of the invention
The object of the invention is to the problems referred to above overcoming prior art existence, propose the fire-resistant medium and high voltage cable manufacture method of a kind of safety-type.Adopt the produced cable laying of method of the present invention on building, have good effect of heat insulation, substantially increase the fire resistance of cable, can delay because the burst accident such as fire, natural calamity is to the destruction of electric power system, for rescue work gains time.
The present invention realizes by the following technical solutions:
The fire-resistant medium and high voltage cable manufacture method of a kind of safety-type, comprise the steps: → wire drawing → annealing → conductor strand → internal shield of selecting materials, co-extrusion and the coated → metal screen layer of insulating barrier and outer shielding layer arrange → the fire-resistant separator of phase-splitting extrudes → the first belting layer is wrapped → stranding stranded wrapped with stranding belting layer → oxygen barrier layer extrudes → the fire-resistant separator of turnkey extrudes → the second belting layer is wrapped → metal armor layers is wrapped → the 3rd belting layer is wrapped → external sheath layer extrudes, it is characterized in that: the fire-resistant separator of described phase-splitting extrudes step and refers to that Ceramic silicon rubber material is extruded on metal screen layer by employing Teh Extrusion Press for Extruding Silicone Rubber Products, extruding thickness is 2.0mm ~ 4.0mm, described oxygen barrier layer step extrudes step and refers to adopt plsitive mold on extrusion apparatus, to be the screw rod of 1.25:1 ~ 2.0:1 with compression ratio by oxygen index be 32 ~ 40 high flame retardant polyolefine material be extruded on stranding belting layer, extruding thickness is 2.0mm ~ 5.0mm, and processing temperature is 80 DEG C ~ 165 DEG C, the fire-resistant separator of described turnkey extrudes step and refers to that Ceramic silicon rubber material is extruded in oxygen barrier layer by employing Teh Extrusion Press for Extruding Silicone Rubber Products, and extruding thickness is 3.0mm ~ 5.0mm.
Described conductor strand step refers to that the multiply tin-coated copper monofilament formed after wire-drawing process is twisted into conductor according to the 10-16 times of length that twisting pitch is stranded conductor diameter length.
Described stranding twisting step refer to by through selecting materials → co-extrusion of wire drawing → annealing → conductor strand → internal shield, insulating barrier and outer shielding layer and coated → metal screen layer arrange → the fire-resistant separator of phase-splitting extrudes → the first belting layer wrapped after many cores being formed be twisted into one; The wrapped step of described stranding belting layer refers to and adopts thickness to be that the glass fiber tape of 0.20mm ~ 0.40mm is formed into cable wrap belt after overlapping wrapped 1 layer ~ 4 layers on stranded all-in-one-piece core, and the wrapped rate of putting up is 10% ~ 50%; Space packed layer between many cores is filled.
The co-extrusion step of described internal shield, insulating barrier and outer shielding layer refers to the material adopting semiconducting rubber material as internal shield and outer shielding layer, adopts hard ethylene-propylene rubber material as the material of insulating barrier; And adopting three-layer co-extruded rubber cover company sulphur equipment to extrude internal shield, insulating barrier, outer shielding layer simultaneously, rubber extruding machine processing temperature is 50 ~ 100 DEG C, 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 to be simultaneously coated on through stranded conductor peripheral from inside to outside successively.
Described metal screen layer setting steps refers to and adopts thickness to be that the soft copper band single overlays of 0.10mm ~ 0.15mm is wrapped in external shield, and the wrapped rate of putting up is 15% ~ 20%; Or adopting diameter to be that the soft copper silk of 0.20mm ~ 0.40mm is woven in external shield, count is 70% ~ 90%.
The wrapped step of described first belting layer, the wrapped step of the second belting layer and the wrapped step of the 3rd belting layer all refer on lapping equipment with overlapping wrapped 1 layer ~ 4 layers of the glass fiber tape that thickness is 0.20mm ~ 0.40mm, first belting layer, the second belting layer and the 3rd belting layer are wrapped on the fire-resistant separator of phase-splitting, the fire-resistant separator of turnkey and metal armor layers respectively, and the wrapped rate of putting up is 10% ~ 50%.
The wrapped step of described metal armor layers refers to and adopts thickness to be that the galvanized steel strip double-layer spiral gap of 0.2 mm ~ 0.8mm is wrapped on the second belting layer, or adopts diameter to 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 to use half plsitive mold on extrusion apparatus, and be that low-smoke halide-free fireproof composite polyolefine material is extruded on the 3rd belting layer and forms external sheath layer by the screw rod of 1.25:1 ~ 2.0:1 with compression ratio, processing temperature is 100 ~ 175 DEG C.
Also be included in the service check experimental procedure and finished product packing warehouse-in step of carrying out after external sheath layer extrudes 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 and adopts two blowtorch, and flame temperature is 750 ~ 800 DEG C, 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 service check experiment, do not have breakdown cable to form finished product.
Described finished product packing warehouse-in step refers to carries out packaging warehouse-in by the finished product by service check step.
Compared with prior art, its advantage is in the present invention:
1, the present invention is provided with the fire-resistant separator of phase-splitting and the fire-resistant separator of turnkey simultaneously, and all adopt Teh Extrusion Press for Extruding Silicone Rubber Products to carry out Ceramic silicon rubber material and extrude, material has good effect of heat insulation, ceramic body is sintered into through high temperature or flame, because ceramic body main material ingredient is inorganic silicon, the mechanical strength of the cable therefore produced is enhanced, originally good electrical insulation properties is further promoted, and greatly can improve the fire resistance of cable.
2, the multiply tin-coated copper monofilament that the present invention adopts conductor strand step to refer to be formed after wire-drawing process is twisted into conductor according to the 10-16 times of length that twisting pitch is stranded conductor diameter length; The conductor structure manufactured by the method is compact, profile rounding, and bending property is good.
3, the present invention adopts three-layer co-extruded rubber to overlap even sulphur equipment and extrudes insulation internal shield, insulating barrier, insulation outer shielding layer simultaneously, and the cable that this three-layer co-extruded mode obtains has very high electric insulating quality; Hard ethylene-propylene rubber material is adopted again to replace traditional crosslinked polyethylene as insulating barrier, and hard second third insulate and crosslinked polyetylene insulatedly can not to melt because temperature is too high as conventional when fire situation, lose insulating effect, cause cable thermal breakdown, be greater than 90min in the fire situation time of adhering to; Can delay because the burst accident such as fire, natural calamity, to the destruction of electric power system, substantially increases the fire resistance of cable, for rescue work gains time.
4, the cable that oxygen barrier layer of the present invention adopts extrusion way to obtain has very high anti-flammability, can effectively prevent cable from prolonging combustion further in fire situation, greatly protect the electric property of inner insulation layer, improves the fire resistance of cable.
5, the present invention adopts metal screen layer setting steps to refer to adopt thickness to be that the soft copper band single overlays of 0.10mm ~ 0.15mm is wrapped in external shield, and the wrapped rate of putting up is 15% ~ 20%; Or adopting diameter to be that the soft copper silk of 0.20mm ~ 0.40mm is woven in external shield, count is 70% ~ 90%; Can strengthen and the effect of restriction electric field in insulation, make direction of an electric field along insulation radial direction, unsymmetrical current and short circuit current can be born simultaneously.
6, the present invention adopts 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 all refer on lapping equipment with overlapping wrapped 1 layer ~ 4 layers of the glass fiber tape that thickness is 0.20mm ~ 0.40mm, first belting layer, the second belting layer and the 3rd belting layer are wrapped on the fire-resistant separator of phase-splitting, the fire-resistant separator of turnkey and metal armor layers respectively, and the wrapped rate of putting up is 10% ~ 50%; Not only play and traditional coatedly tighten effect, can also greatly improve the fire-retardant of cable and effect of heat insulation, the wrapped glass fiber tape at metal armor layers also has and improves sheath anti-cracking performance simultaneously.
7, the wrapped step of metal armor layers that the present invention adopts refers to and adopts thickness to be that the galvanized steel strip double-layer spiral gap of 0.2 mm ~ 0.8mm is wrapped on the second belting layer, or adopts diameter to 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, there is excellent fire performance simultaneously, 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, the particularity that low smoke and zero halogen thermosetting polymer CABLE MATERIALS shearing force is large can be met, can avoid filling magnesium hydroxide and aluminium hydroxide containing high in low smoke and zero halogen thermosetting polymer CABLE MATERIALS, in extrusion process, because frictional force is large, produce a large amount of heats; When also avoid for low smoke and zero halogen thermosetting polymer CABLE MATERIALS, adopt compression ratio excessive, need the situation of setting up the extrusion equipment with good cooling device.
9, the present invention adopts low compression ratio Screw Extrusion, greatly can reduce the shearing force in material extrusion, and protection extrusion apparatus can not be excessive because of shearing force, causes current of electric excessive and damage equipment; Half plsitive mold is extruded, and cable can not only be made to extrude rear rounding, and the method effectively can control 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 service check to test, after service check experiment, do not have breakdown cable to form finished product, carries out packaging warehouse-in; Breakdown cable is fakement, can not put in storage; The cable fakement rate adopting method of the present invention to make is low, has saved production cost.
Accompanying drawing explanation
Fig. 1 is present invention process flow chart
Fig. 2 is the embodiment of the present invention 2 process chart
Fig. 3 is structural representation of the present invention
Mark in figure: 1, conductor; 2, internal shield; 3, insulating barrier; 4, outer shielding layer; 5, metal screen layer; 6, the fire-resistant separator of phase-splitting; 7, the first belting layer; 8, packed layer; 9, stranding belting layer; 10, oxygen barrier layer; 11, the fire-resistant separator of turnkey; 12, the second belting layer; 13, metal armor layers; 14, the 3rd belting layer; 15, external sheath layer.
Embodiment
Embodiment 1:
The fire-resistant medium and high voltage cable manufacture method of a kind of safety-type, comprise the steps: → wire drawing → annealing → conductor strand → internal shield of selecting materials, co-extrusion and the coated → metal screen layer of insulating barrier and outer shielding layer arrange → the fire-resistant separator of phase-splitting extrudes → the first belting layer is wrapped → stranding stranded wrapped with stranding belting layer → oxygen barrier layer extrudes → the fire-resistant separator of turnkey extrudes → the second belting layer is wrapped → metal armor layers is wrapped → the 3rd belting layer is wrapped → external sheath layer extrudes, the fire-resistant separator of described phase-splitting extrudes step and refers to that Ceramic silicon rubber material is extruded on metal screen layer 5 by employing Teh Extrusion Press for Extruding Silicone Rubber Products, extruding thickness is 2.0mm, described oxygen barrier layer step extrudes step and refers to adopt plsitive mold on extrusion apparatus, to be the screw rod of 1.25:1 with compression ratio by oxygen index be 32 high flame retardant polyolefine material be extruded on stranding belting layer, extruding thickness is 2.0mm, and processing temperature is 80 DEG C, the fire-resistant separator of described turnkey extrudes step and refers to that adopting Teh Extrusion Press for Extruding Silicone Rubber Products to be extruded by Ceramic silicon rubber material is coated in oxygen barrier layer, and extruding thickness is 3.0mm.
In the present invention, described conductor strand step refers to that the multiply tin-coated copper monofilament formed after wire-drawing process is twisted into conductor according to 10 times of length that twisting pitch is stranded conductor diameter length.
In the present invention, described stranding twisting step refer to by through selecting materials → co-extrusion of wire drawing → annealing → conductor strand → internal shield, insulating barrier and outer shielding layer and coated → metal screen layer arrange → the fire-resistant separator of phase-splitting extrudes → the first belting layer wrapped after many cores being formed be twisted into one; The wrapped step of described stranding belting layer refers to and adopts thickness to be that the glass fiber tape of 0.20mm overlapping wrapped 1 is formed into cable wrap belt afterwards layer by layer on stranded all-in-one-piece core, and the wrapped rate of putting up is 10%; Space packed layer between many cores is filled.
In the present invention, the co-extrusion step of described internal shield, insulating barrier and outer shielding layer refers to the material adopting semiconducting rubber material as internal shield and outer shielding layer, adopts hard ethylene-propylene rubber material as the material of insulating barrier; And adopting three-layer co-extruded rubber cover company sulphur equipment to extrude internal shield, insulating barrier, outer shielding layer simultaneously, rubber extruding machine processing temperature is 50 DEG C, 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 to be simultaneously coated on through stranded conductor peripheral from inside to outside successively; Namely internal shield is coated on conductor, and insulating barrier is coated on internal shield, and outer shielding layer is on the insulating layer coated.
In the present invention, described metal screen layer setting steps refers to and adopts thickness to be that the soft copper band single overlays of 0.10mm is wrapped in external shield, and the wrapped rate of putting up is 15%.
In the present invention, the wrapped step of described first belting layer, the wrapped step of the second belting layer and the wrapped step of the 3rd belting layer all refer on lapping equipment with overlapping wrapped 1 layer of the glass fibre that thickness is 0.20mm, first belting layer, the second belting layer and the 3rd belting layer are wrapped on the fire-resistant separator of phase-splitting, the fire-resistant separator of turnkey and metal armor layers respectively, and the wrapped rate of putting up is 10%.
In the present invention, the wrapped step of described metal armor layers refers to and adopts thickness to be that the galvanized steel strip double-layer spiral gap of 0.2 mm is wrapped on the second belting layer.
In the present invention, described external sheath layer extrudes step and refers to use half plsitive mold on extrusion apparatus, and be that flame retardant polyolefine material is extruded on the 3rd belting layer and forms external sheath layer by the screw rod of 1.25:1 with compression ratio, processing temperature is 100 DEG C.
Embodiment 2:
The fire-resistant medium and high voltage cable manufacture method of a kind of safety-type, comprise the steps: → wire drawing → annealing → conductor strand → internal shield of selecting materials, co-extrusion and the coated → metal screen layer of insulating barrier and outer shielding layer arrange → the fire-resistant separator of phase-splitting extrudes → the first belting layer is wrapped → stranding stranded wrapped with stranding belting layer → oxygen barrier layer extrudes → the fire-resistant separator of turnkey extrudes → the second belting layer is wrapped → metal armor layers is wrapped → the 3rd belting layer is wrapped → external sheath layer extrudes → service check tests → finished product packing puts in storage, the fire-resistant separator of described phase-splitting extrudes step and refers to that Ceramic silicon rubber material is extruded on metal screen layer by employing Teh Extrusion Press for Extruding Silicone Rubber Products, extruding thickness is 3.0mm, described oxygen barrier layer step extrudes step and refers to adopt plsitive mold on extrusion apparatus, to be the screw rod of 1.25:1 with compression ratio by oxygen index be 35 high flame retardant polyolefine material be extruded on stranding belting layer, extruding thickness is 4.0mm, and processing temperature is 120 DEG C, the fire-resistant separator of described turnkey extrudes step and refers to that Ceramic silicon rubber material is extruded in oxygen barrier layer by employing Teh Extrusion Press for Extruding Silicone Rubber Products, and extruding thickness is 4.0mm.
In the present invention, described conductor strand step refers to that the multiply tin-coated copper monofilament formed after wire-drawing process is twisted into conductor according to 13 times of length that twisting pitch is stranded conductor diameter length.
In the present invention, described stranding twisting step refer to by through selecting materials → co-extrusion of wire drawing → annealing → conductor strand → internal shield, insulating barrier and outer shielding layer and coated → metal screen layer arrange → the fire-resistant separator of phase-splitting extrudes → the first belting layer wrapped after many cores being formed be twisted into one; The wrapped step of described stranding belting layer refers to and adopts thickness to be that the glass fiber tape of 0.30mm is formed into cable wrap belt after overlapping wrapped 2 layers on stranded all-in-one-piece core, and the wrapped rate of putting up is 30%; Space packed layer between many cores is filled.
In the present invention, the co-extrusion step of described internal shield, insulating barrier and outer shielding layer refers to the material adopting semiconducting rubber material as internal shield and outer shielding layer, adopts hard ethylene-propylene rubber material as the material of insulating barrier; And adopting three-layer co-extruded rubber cover company sulphur equipment to extrude internal shield, insulating barrier, outer shielding layer simultaneously, rubber extruding machine processing temperature is 80 DEG C, 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 to be simultaneously coated on through stranded conductor peripheral from inside to outside successively; Namely internal shield is coated on conductor, and insulating barrier is coated on internal shield, and outer shielding layer is on the insulating layer coated.
In the present invention, described metal screen layer setting steps refers to and adopts thickness to be that the soft copper band single overlays of 0.12mm is wrapped in external shield, and the wrapped rate of putting up is 18%.
In the present invention, the wrapped step of described first belting layer, the wrapped step of the second belting layer and the wrapped step of the 3rd belting layer all refer on lapping equipment with overlapping wrapped 2 layers of the glass fibre that thickness is 0.30mm, first belting layer, the second belting layer and the 3rd belting layer are wrapped on the fire-resistant separator of phase-splitting, the fire-resistant separator of turnkey and metal armor layers respectively, and the wrapped rate of putting up is 30%.
In the present invention, the wrapped step of described metal armor layers refers to and adopts thickness to be that the galvanized steel strip double-layer spiral gap of 0.5 mm is wrapped on the second belting layer.
In the present invention, described external sheath layer extrudes step and refers to use half plsitive mold on extrusion apparatus, and be that flame retardant polyolefine material is extruded on the 3rd belting layer and forms external sheath layer by the screw rod of 1.25:1 with compression ratio, processing temperature is 150 DEG C.
In 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 and adopts two blowtorch, and flame temperature is 750 DEG C, 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 service check experiment, do not have breakdown cable to form finished product.
In the present invention, described finished product packing warehouse-in step refers to carries out packaging warehouse-in by the finished product by service check step.
Embodiment 3:
The fire-resistant medium and high voltage cable manufacture method of a kind of safety-type, comprise the steps: → wire drawing → annealing → conductor strand → internal shield of selecting materials, co-extrusion and the coated → metal screen layer of insulating barrier and outer shielding layer arrange → the fire-resistant separator of phase-splitting extrudes → the first belting layer is wrapped → stranding stranded wrapped with stranding belting layer → oxygen barrier layer extrudes → the fire-resistant separator of turnkey extrudes → the second belting layer is wrapped → metal armor layers is wrapped → the 3rd belting layer is wrapped → external sheath layer extrudes → service check tests → finished product packing puts in storage, the fire-resistant separator of described phase-splitting extrudes step and refers to that Ceramic silicon rubber material is extruded on metal screen layer by employing Teh Extrusion Press for Extruding Silicone Rubber Products, extruding thickness is 4.0mm, described oxygen barrier layer step extrudes step and refers to adopt plsitive mold on extrusion apparatus, to be the screw rod of 2.0:1 with compression ratio by oxygen index be 40 high flame retardant polyolefine material be extruded on stranding belting layer, extruding thickness is 5.0mm, and processing temperature is 165 DEG C, the fire-resistant separator of described turnkey extrudes step and refers to that Ceramic silicon rubber material is extruded in oxygen barrier layer by employing Teh Extrusion Press for Extruding Silicone Rubber Products, and extruding thickness is 5.0mm.
In the present invention, described conductor strand step refers to that the multiply tin-coated copper monofilament formed after wire-drawing process is twisted into conductor according to 16 times of length that twisting pitch is stranded conductor diameter length.
In the present invention, described stranding twisting step refer to by through selecting materials → co-extrusion of wire drawing → annealing → conductor strand → internal shield, insulating barrier and outer shielding layer and coated → metal screen layer arrange → the fire-resistant separator of phase-splitting extrudes → the first belting layer wrapped after many cores being formed be twisted into one; The wrapped step of described stranding belting layer refers to and adopts thickness to be that the glass fiber tape of 0.40mm is formed into cable wrap belt after overlapping wrapped 4 layers on stranded all-in-one-piece core, and the wrapped rate of putting up is 50%; Space packed layer between many cores is filled.
In the present invention, the co-extrusion step of described internal shield, insulating barrier and outer shielding layer refers to the material adopting semiconducting rubber material as internal shield and outer shielding layer, adopts hard ethylene-propylene rubber material as the material of insulating barrier; And adopting three-layer co-extruded rubber cover company sulphur equipment to extrude internal shield, insulating barrier, outer shielding layer simultaneously, rubber extruding machine processing temperature is 100 DEG C, 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 to be simultaneously coated on through stranded conductor peripheral from inside to outside successively; Namely internal shield is coated on conductor, and insulating barrier is coated on internal shield, and outer shielding layer is on the insulating layer coated.
In the present invention, described metal screen layer setting steps refers to and adopts thickness to be that the soft copper band single overlays of 0.15mm is wrapped in external shield, and the wrapped rate of putting up is 20%.
In the present invention, the wrapped step of described first belting layer, the wrapped step of the second belting layer and the wrapped step of the 3rd belting layer all refer on lapping equipment with overlapping wrapped 4 layers of the glass fibre that thickness is 0.40mm, first belting layer, the second belting layer and the 3rd belting layer are wrapped on the fire-resistant separator of phase-splitting, the fire-resistant separator of turnkey and metal armor layers respectively, and the wrapped rate of putting up is 50%.
In the present invention, the wrapped step of described metal armor layers refers to and adopts thickness to be that the galvanized steel strip double-layer spiral gap of 0.8mm is wrapped on the second belting layer.
In the present invention, described external sheath layer extrudes step and refers to use half plsitive mold on extrusion apparatus, and be that flame retardant polyolefine material is extruded on the 3rd belting layer and forms external sheath layer by the screw rod of 2.0:1 with compression ratio, processing temperature is 175 DEG C.
In 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 and adopts two blowtorch, and flame temperature is 800 DEG C, 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 service check experiment, do not have breakdown cable to form finished product.
In the present invention, described finished product packing warehouse-in step refers to carries out packaging warehouse-in by the finished product by service check step.
Embodiment 4:
Be with the difference of embodiment 1,2,3: described metal screen layer setting steps refers to and adopts diameter to be that the soft copper silk of 0.20mm is woven in external shield, and count is 70%; The wrapped step of described metal armor layers refers to and adopts diameter to be that the zinc-coated wire spiral winding of 1.25mm wraps on the second belting layer.
Embodiment 5:
Be with the difference of embodiment 1,2,3,4: described metal screen layer setting steps refers to and adopts diameter to be that the soft copper silk of 0.40mm is woven in external shield, and count is 90%.The wrapped step of described metal armor layers refers to and adopts diameter to be that the zinc-coated wire spiral winding of 6.0mm wraps on the second belting layer.
The invention is not restricted to above-described embodiment, the combination change in above-mentioned process parameters range is all in protection scope of the present invention.
Claims (3)
1. the fire-resistant medium and high voltage cable manufacture method of safety-type, comprise the steps: → wire drawing → annealing → conductor strand → internal shield of selecting materials, co-extrusion and the coated → metal screen layer of insulating barrier and outer shielding layer arrange → the fire-resistant separator of phase-splitting extrudes → the first belting layer is wrapped → stranding stranded wrapped with stranding belting layer → oxygen barrier layer extrudes → the fire-resistant separator of turnkey extrudes → the second belting layer is wrapped → metal armor layers is wrapped → the 3rd belting layer is wrapped → external sheath layer extrudes → service check tests → finished product packing puts in storage, it is characterized in that: the fire-resistant separator of described phase-splitting extrudes step and refers to that Ceramic silicon rubber material is extruded on metal screen layer by employing Teh Extrusion Press for Extruding Silicone Rubber Products, extruding thickness is 2.0mm ~ 4.0mm, described oxygen barrier layer step extrudes step and refers to adopt plsitive mold on extrusion apparatus, to be the screw rod of 1.25:1 ~ 2.0:1 with compression ratio by oxygen index be 32 ~ 40 high flame retardant polyolefine material be extruded on stranding belting layer, extruding thickness is 2.0mm ~ 5.0mm, and processing temperature is 80 DEG C ~ 165 DEG C, the fire-resistant separator of described turnkey extrudes step and refers to that Ceramic silicon rubber material is extruded in oxygen barrier layer by employing Teh Extrusion Press for Extruding Silicone Rubber Products, extruding thickness is 3.0mm ~ 5.0mm, described conductor strand step refers to that the multiply tin-coated copper monofilament formed after wire-drawing process is twisted into conductor according to the 10-16 times of length that twisting pitch is stranded conductor diameter length, the co-extrusion step of described internal shield, insulating barrier and outer shielding layer refers to the material adopting semiconducting rubber material as internal shield and outer shielding layer, adopts hard ethylene-propylene rubber material as the material of insulating barrier, and adopting three-layer co-extruded rubber cover company sulphur equipment to extrude internal shield, insulating barrier, outer shielding layer simultaneously, rubber extruding machine processing temperature is 50 ~ 100 DEG C, 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 to be simultaneously coated on through stranded conductor peripheral from inside to outside successively, described metal screen layer setting steps refers to and adopts thickness to be that the soft copper band single overlays of 0.10mm ~ 0.15mm is wrapped in external shield, and the wrapped rate of putting up is 15% ~ 20%, or adopt diameter to be that the soft copper silk of 0.20mm ~ 0.40mm is woven in external shield, count is 70% ~ 90%, the wrapped step of described first belting layer, the wrapped step of second belting layer and the wrapped step of the 3rd belting layer all refer on lapping equipment with overlapping wrapped 1 layer ~ 4 layers of the glass fiber tape that thickness is 0.20mm ~ 0.40mm, first belting layer, second belting layer and the 3rd belting layer are wrapped at the fire-resistant separator of phase-splitting respectively, on the fire-resistant separator of turnkey and metal armor layers, the wrapped rate of putting up is 10% ~ 50%, the wrapped step of described metal armor layers refers to and adopts thickness to be that the galvanized steel strip double-layer spiral gap of 0.2 mm ~ 0.8mm is wrapped on the second belting layer, or adopt diameter to 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 to use half plsitive mold on extrusion apparatus, be that flame retardant polyolefine material is extruded on the 3rd belting layer and forms external sheath layer by the screw rod of 1.25:1 ~ 2.0:1 with compression ratio, processing temperature is 100 ~ 175 DEG C.
2. the fire-resistant medium and high voltage cable manufacture method of a kind of safety-type according to claim 1, it is characterized in that: be also included in the service check experimental procedure and finished product packing warehouse-in step of carrying out after external sheath layer extrudes step, described service check experiment comprises conductor DC resistance test, power frequency withstand test and fire resistance test; Described fire resistance test refers to and adopts two blowtorch, and flame temperature is 750 ~ 800 DEG C, 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 service check experiment, do not have breakdown cable to form finished product.
3. the fire-resistant medium and high voltage cable manufacture method of a kind of safety-type according to claim 2, is characterized in that: described finished product packing warehouse-in step refers to carries out packaging warehouse-in by the finished product by service check step.
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| CN103198898A (en) * | 2013-03-25 | 2013-07-10 | 浙江中天电线电缆有限公司 | Termite-proof and compression resistant directly-buried data cable |
| CN105023642B (en) * | 2015-07-28 | 2017-01-04 | 远东电缆有限公司 | A kind of the wisdom energy EMUs low-smoke non-halogen flame-retardant high-voltage flexible cable and production technology |
| CN105070394A (en) * | 2015-07-29 | 2015-11-18 | 兰州众邦电线电缆集团有限公司 | Fire-proof and fire-resistant medium-voltage power cable |
| CN105427955A (en) * | 2015-12-14 | 2016-03-23 | 苏州国环环境检测有限公司 | Cable production technology |
| CN108010638A (en) * | 2017-11-30 | 2018-05-08 | 四川明星电缆股份有限公司 | A kind of low manufacture method for discharging environmentally protective fire-resisting cable of high fire-retardance |
| CN107993770A (en) * | 2017-11-30 | 2018-05-04 | 四川明星电缆股份有限公司 | A kind of low manufacture method for discharging environmentally protective shielded cable of high fire-retardance |
| CN109448921B (en) * | 2018-11-19 | 2020-07-31 | 尚纬股份有限公司 | Manufacturing method of inorganic fireproof medium-high voltage cable |
| CN109949997A (en) * | 2019-04-25 | 2019-06-28 | 佛山市宏图中宝电缆有限公司 | Fire-resisting cable is pressed in one kind |
| CN114724779B (en) * | 2022-04-06 | 2022-09-06 | 浙江世昆线缆有限公司 | Preparation method of cable with double performances of fire prevention and heat dissipation |
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