CN105206336A - Large-section steel core aluminum stranded wire and manufacturing method thereof - Google Patents
Large-section steel core aluminum stranded wire and manufacturing method thereof Download PDFInfo
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Abstract
The invention relates to a large-section steel core aluminum stranded wire. The steel core part is divided into three layers, namely the center layer, the inner layer and the outer layer, the inner layer is stranded at the outer edge of the center layer anticlockwise, and the outer layer is stranded at the outer edge of the inner layer clockwise. The aluminum wire part is divided into four layers, namely the innermost layer, the adjacent inner layer, the adjacent outer layer and the outermost layer. The innermost layer is stranded at the outer edge of the outer layer anticlockwise, the adjacent inner layer is stranded at the outer edge of the innermost layer clockwise, the adjacent outer layer is stranded at the outer edge of the adjacent inner layer anticlockwise, and the outmost layer is stranded at the outer edge of the adjacent outer layer clockwise. According to the large-section steel core aluminum stranded wire, the stranded steel core aluminum stranded wire is even, tight, bright and clean in surface, neat in wire arrangement, free of loosening, good in electricity conductivity, large in current-carrying capacity, high in corrosion resistance and long in service life, the puling strength can reach 336 KN, and the performance requirement for wires of ultrahigh or extreme high voltage electric transmission lines, such as 500 KV, 750 KV and 1000 KV or national key transmission lines can be fully met.
Description
Technical field
The invention belongs to steel reinforced aluminium conductor construction applications, especially a kind of heavy in section steel reinforced aluminium conductor and manufacture method thereof.
Background technology
Aerial insulated cable is because its structure is simple, safe and reliable and the advantage such as economy and durability is widely used in transmission line, its structure is made up of steel reinforced aluminium conductor, conductor shield and insulating barrier, conductor shield is coated on steel reinforced aluminium conductor outer rim, insulating barrier is coated on the outer rim of conductor shield, and steel reinforced aluminium conductor is wherein the reinforced type lead wire be stranded in by multilayer aluminum steel outside galvanized steel wire.
In recent years, the raising that national grid surpasses, the fast development of UHV transmission line facilitates national T & D Technology, New Technologies of Electric Power Transmission is widely applied, the heavy in section steel reinforced aluminium conductor adopted as the needs for meeting high-power transmission of electric energy, namely smallest cross-sectional wire (such as 220kV, the 300mm of the routine that economic current density controls is exceeded
2; 500kV, 4 × 300mm
2) and the wire of the larger cross-section of employing (as 500kV, 4 × 500mm
2, 4 × 630mm
2, 4 × 800mm
2), the conveying capacity of circuit can be significantly improved like this, effectively can reduce transmission of electricity line loss, save wire consumption, reduce power engineering investment, cut operating costs, but the steel reinforced aluminium conductor of existing maximum cross-section can also improve its performance further.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art part, provide rational in infrastructure, the high and a kind of heavy in section steel reinforced aluminium conductor that bearing capacity is high of intensity.
The present invention solves its technical problem and takes following technical scheme to realize:
A kind of heavy in section steel reinforced aluminium conductor, be made up of the steel core part of center and aluminum steel part, it is characterized in that: described steel core part is three layers, be made up of central core, internal layer and skin, internal layer is stranded in central core outer rim counterclockwise, skin is stranded in internal layer outer rim clockwise, and central core, internal layer and outer field zinc-coated wire quantity are 1,6 and 12;
Described aluminum steel part is four layers, be made up of innermost layer, adjacent internal layer, adjacent skin and outermost layer, innermost layer is stranded in outer outer rim counterclockwise, adjacent internal layer is stranded in innermost layer outer rim clockwise, adjacent skin is stranded in adjacent internal layer outer rim counterclockwise, outermost layer is stranded in adjacent outer outer rim clockwise, and the quantity of innermost layer, adjacent internal layer, adjacent skin and outermost aluminum steel is 12,18,24 and 30.
And, the diameter of every root zinc-coated wire of described steel core part be 2.69 ~ 2.71 millimeters and three layers stranded after sectional area be 135 square millimeters, the diameter of every root aluminum steel of described aluminum steel part is 4.50 ~ 4.53 millimeters and sectional area after aluminum steel part and steel core part compound is 1400 square millimeters.
And the diameter average of described zinc-coated wire is 2.70 millimeters, the weight average of zinc coat is 259 grams/m, and tensile strength average is 1486 MPas, and 1% elongation stress average is 1220 MPas, and number of torsions is 22 ~ 24 times, and percentage elongation average is 5.4%.
And the diameter average of described aluminum steel is 4.52 millimeters, and tensile strength average is 176 MPas, and strength variance is less than 20 MPas, and resistivity is 27.86.
Another object of the present invention is to provide the manufacture method of a kind of heavy in section steel reinforced aluminium conductor, it is characterized in that: comprise and prepare galvanized strand wires, prepare aluminum steel and steel reinforced aluminium conductor is stranded;
The described raw material preparing galvanized strand wires is the wire rod of 65# Φ 6.5 millimeters;
The described raw material preparing aluminum steel is A
8the aluminium bar of Φ 9.50 millimeters, the total draught of drawing is 77.56%, and mean pressure shrinkage is that the 19.22%, 1st passes of drawing is by 9.50 to 9.10,2nd passes of drawing is by 9.10 to 7.97,3rd passes of drawing is by 7.97 to 6.97, and the 4th passes of drawing is by 6.97 to 6.10, and the 5th passes of drawing is by 6.10 to 5.33,6th passes of drawing is by 5.33 to 4.66,7th passes of drawing is by 4.66 to 4.50, and drawing speed is 10 meter per seconds, and rear placement 24 hours made by aluminum steel;
Frame type stranding machine is coiled in the stranded employing 84 of described steel reinforced aluminium conductor;
Steel core part: the external diameter of internal layer is 8.1 millimeters, and pitch is 158 ± 5 millimeters, and lay ratio is 19.51, and direction of lay is counterclockwise; Outer field external diameter is 13.5 millimeters, and pitch is 246 ± 5 millimeters, and lay ratio is 18.22, and direction of lay is clockwise;
Aluminum steel part: the external diameter of innermost layer is 22.5 millimeters, and pitch is 342 ± 5 millimeters, and lay ratio is 15.20, and direction of lay is counterclockwise; The external diameter of adjacent internal layer is 31.5 millimeters, and pitch is 437 ± 5 millimeters, and lay ratio is 13.87, and direction of lay is clockwise; Adjacent outer field external diameter is 40.5 millimeters, and pitch is 495 ± 5 millimeters, and lay ratio is 12.22, and direction of lay is counterclockwise; Outermost external diameter is 49.5 millimeters, and pitch is 562 ± 5 millimeters, and lay ratio is 11.35, and direction of lay is clockwise.
Advantage of the present invention and good effect are:
In the present invention, steel core part is three layers that are coated togather successively, the quantity of every layer of zinc-coated wire is 1, 6 and 12, aluminum steel part is four layers that are coated togather successively, the quantity of every layer of aluminum steel is 12, 18, 24 and 30, the sectional area of the steel reinforced aluminium conductor made is 1400 square millimeters, 12% is added than prior art, the sectional area of steel core part is 135 square millimeters, 35% is added than prior art, steel reinforced aluminium conductor uniform close after stranded, any surface finish, winding displacement is neat, not loose, conduct electricity very well, ampacity is large, corrosion resistance is strong, long service life, pull-off force can reach 336,000 Ns, fully meet 500 kilovolts, 750 kilovolts, 1000 kilovolts etc. super, performance requirement to wire in UHV transmission line or state key transmission line.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Embodiment
Below in conjunction with accompanying drawing, also by specific embodiment, the invention will be further described, and following examples are descriptive, are not determinate, can not limit protection scope of the present invention with this.
A kind of heavy in section steel reinforced aluminium conductor, as shown in Figure 1, be made up of the steel core part of center and aluminum steel part, innovative point of the present invention is: described steel core part is three layers, be made up of central core 7, internal layer 6 and outer 5, internal layer is stranded in central core outer rim counterclockwise, and skin is stranded in internal layer outer rim clockwise, and central core, internal layer and outer field zinc-coated wire quantity are 1,6 and 12;
Described aluminum steel part is four layers, be made up of innermost layer 4, adjacent internal layer 3, adjacent skin 2 and outermost layer 1, innermost layer is stranded in outer outer rim counterclockwise, adjacent internal layer is stranded in innermost layer outer rim clockwise, adjacent skin is stranded in adjacent internal layer outer rim counterclockwise, outermost layer is stranded in adjacent outer outer rim clockwise, and the quantity of innermost layer, adjacent internal layer, adjacent skin and outermost aluminum steel is 12,18,24 and 30.
In the present embodiment, the diameter of every root zinc-coated wire of described steel core part be 2.69 ~ 2.71 millimeters and three layers stranded after sectional area be 135 square millimeters, the diameter of every root aluminum steel of described aluminum steel part is 4.50 ~ 4.53 millimeters and sectional area after aluminum steel part and steel core part compound is 1400 square millimeters.
Obtained end properties is in table 1:
Table 1: performance evaluation
Another object of the present invention is to provide the manufacture method of a kind of heavy in section steel reinforced aluminium conductor, it is characterized in that: comprise and prepare galvanized strand wires, prepare aluminum steel and steel reinforced aluminium conductor is stranded;
The described raw material preparing galvanized strand wires is the wire rod of 65# Φ 6.5 millimeters; Controlling zinc-coated wire diameter is 2.70 (+0.03,-0.03) millimeter, zinc layers minimum weight is 230 grams/square millimeter, and standard deviation controls within the scope of 10 grams/square millimeter, tensile strength >=1400 MPa, 1% elongation stress >=1200 MPa, number of torsions >=16 time, percentage elongation reaches >=and 3.0%.
By optimizing zincincation, control is smeared and is wiped electric current, nitrogen flow and temperature, the zinc-coated wire zinc layers obtained firmly, evenly, surfacing is bright and clean, and the diameter average of described zinc-coated wire is 2.70 millimeters, the weight average of zinc coat is 314 grams/m, tensile strength average is 1731.7 MPas, and 1% elongation stress average is 1441 MPas, and number of torsions is 29 times, percentage elongation average is 5.2%, and properties ensure that bearing capacity and the corrosion resistance of large-section lead.
The described raw material preparing aluminum steel is A
8the aluminium bar of Φ 9.50 millimeters, aluminum steel is subject to strong plastic deformation in drawing process, and the microstructure generation significant change of material internal, affects mechanical property and the conductive capability of wire.Drawing process should ensure that drawing is carried out smoothly, makes the reasonable tube reducing of aluminium wire, ensures that product has good combination property again, therefore determines that the total draught of drawing process and Partial shrinkage rate become the key of drawing process.Facts have proved, during aluminium bar aluminium content >=99.6%, total draught is selected in 70% ~ 95%, and mean pressure shrinkage is selected in 19% ~ 25% scope, and aluminium wire can be made to obtain higher tensile strength and conductivity.Drawing passes arrange in table 2:
Table 2: drawing passes
Drawing adopts LHD450/13 type High-speed Aluminium wire drawing machine, and finished product die has constant speed spinfunction, and tensile stress can be made to reduce by tens times, makes the aluminium single line of drawing have the good technological effect of rounding property; Adopt high-quality mineral oil to be the lubricating oil of matrix, aluminum steel is played to the effects such as lubrication, cooling, cleaning, improve the presentation quality of aluminum steel; Under the condition ensureing the cooling effect that lubrication is abundant and good, according to outlet temperature (controlling lower than less than 80 DEG C), determine that rational drawing speed is 10m/s.
Controlling the tensile strength of aluminium single line and uniformity well is conducive to the production of steel reinforced aluminium conductor, under the prerequisite meeting standard-required, the aluminum steel plasticity that intensity is less is better, not easily break in strand system, aluminum steel even intensity then can ensure the outward appearance rounding of steel reinforced aluminium conductor simultaneously, and can avoid occurring illusion bigger than normal during test D.C. resistance.
Aluminum steel diameter average after drawing is 4.52 millimeters, and tensile strength average is 184 MPas, and resistivity is 27.86.Aluminum steel is after production is rolled off the production line, and static placement enough 24 hours upper machines are stranded, guarantees that the temperature of often coiling aluminum steel is consistent, avoids aluminum steel to there is residual stress, formed snakelike curved, affect the fineness of finished product wire.The strength variance often coiling aluminum steel controls within 20MPa, and carry out joining dish and produce, the outward appearance avoiding aluminum steel to cause because intensity is uneven not rounding, the situations such as easy broken string occur.
When steel reinforced aluminium conductor is produced, require that outer aluminum steel must not have welding, to guarantee any surface finish and the intensity of wire, inner welded strictly will control piece-ups, therefore scale wire drawing is required, and consider the lay ratio difference that aluminum steel every layer is stranded, cut lengths accurately should be calculated, avoid the artificial welding because curtailment causes.For ensureing weld strength, thermofussion welding can not be used, internal layer aluminum steel will adopt Cold welding, detect through actual, aluminum wire connector intensity reaches 167MPa, meet the index request that strength of welded joint that GB/T1179-2008 " circle line concentric gallows empty conductor " specifies is greater than 130MPa, ensure that the bulk strength of wire.
Production equipment adopts 84 dishes, four sections of frame type stranding machines, 84 aluminum steels and the galvanized strand wires once system of twisting form, this equipment has advanced international standard, be furnished with good pre twist and aluminium single line tension adjusting device, adopt uncoiling plate on the whole, Pneumatic Tension controls, and have automatic tension governor motion can keep the stable of tension force, its tension force when dishful and tray is not changed, the employing earth's axis links, ensure the accurate of twisted wire pitch, stable, brand-new all-digital dc speed-regulating system controls the start-up and operation speed of direct current machine, electric-control system advanced technology, reliable.
Steel core part:
The external diameter of internal layer is 8.1 millimeters, and pitch is 158 ± 5 millimeters, and lay ratio is 19.51, and direction of lay is counterclockwise, die size is 7.00 millimeters, and pretwist distance is 142 millimeters, and pressure is highly 34 millimeters, length factor is 1.0058, and length is 220 meters/axle, and spooling length is 222 meters;
Outer field external diameter is 13.5 millimeters, and pitch is 246 ± 5 millimeters, and lay ratio is 18.22, and direction of lay is clockwise, die size is 12 millimeters, and pretwist distance is 221 millimeters, and pressure is highly 54 millimeters, length factor is 1.0095, and length is 220 meters/axle, and spooling length is 223 meters.
Aluminum steel part:
For guaranteeing that four layers of coated stranded rear dimensional accuracy reach standard regulation, not loose, good straightness degree, reasonably should design the pitch of wire.The pitch length of wire is the axial length that every layer of single line forms a complete helix, and in twisted wire, the pitch of single line is called lay ratio with the ratio of the external diameter of this layer.For ensureing the quality of twisted wire, should guarantee that every layer of lay ratio meets the requirements of the standard.
In order to reduce the internal stress of the rear aluminium single line of strand system, guarantee that wire is not easily loose in work progress, frame winch equipment devises pre twist, make aluminium single line before entering wire parallel module, form S shape trend, give pre-twisting strain, make stranded after aluminium single line closely not easily loose, eliminate twisted wire in construction cut off after broken lot phenomenon.
Pre-forming device when reasonably regulating finished product outlet according to the diameter of aluminium single line, the change that vertical and horizontal are peak-shaped curve done by wire in this device, thus farthest eliminate aluminum steel stranded after internal stress, make stranded after wire straight, tight, fully meet the instructions for use of user.
Using wire parallel module when twisting processed, using laterally zygomorphic hard wooden model, adjusting every laminated suitable die size, ensure the tightness of aluminium stranded conductor, prevent the jumping stock of aluminium single line.
The external diameter of innermost layer is 22.5 millimeters, pitch is 342 ± 5 millimeters, lay ratio is 15.20, and direction of lay is that die size is 22 millimeters counterclockwise, pretwist distance is 325 millimeters, pressure distance is 18 millimeters, and auger rotating speed is 119.4, and length factor is 1.0137, length is 220 meters/axle, and spooling length is 224 meters;
The external diameter of adjacent internal layer is 31.5 millimeters, pitch is 437 ± 5 millimeters, lay ratio is 13.87, and direction of lay is that die size is 31 millimeters clockwise, pretwist distance is 415 millimeters, pressure distance is 27 millimeters, and auger rotating speed is 93.4, and length factor is 1.0188, length is 220 meters/axle, and spooling length is 226 meters;
Adjacent outer field external diameter is 40.5 millimeters, pitch is 495 ± 5 millimeters, lay ratio is 12.22, and direction of lay is that die size is 40 millimeters counterclockwise, pretwist distance is 470 millimeters, pressure distance is 36 millimeters, and auger rotating speed is 82.4, and length factor is 1.0261, length is 220 meters/axle, and spooling length is 227 meters;
Outermost external diameter is 49.5 millimeters, pitch is 562 ± 5 millimeters, lay ratio is 11.35, and direction of lay is that die size is 49 millimeters clockwise, pretwist distance is 534 millimeters, pressure distance is 45 millimeters, and auger rotating speed is 72.7, and length factor is 1.0316, length is 220 meters/axle, and spooling length is 228 meters.
Through detecting: the coefficient of linear expansion of steel reinforced aluminium conductor is α=21.3 × 10
-6(1/ DEG C); Modulus of elasticity is 65.3GPa; The mean value of evenness is 0.2 millimeter; Twisted wire perimeter change rate average under no-station pole canopy and 30%RTS tension force is 0.18%; 3.00 × 10
7the wire at the suspension clamp place of secondary continuous shaking fatigue test to break stock phenomenon without any cracking; 15%, 25% and 40%RTS tension force under the creep compliance of 10 years be respectively 322 millimeters/kilometer, 520 millimeters/kilometer and 904 millimeters/kilometer.
In the present invention, steel core part is three layers that are coated togather successively, the quantity of every layer of zinc-coated wire is 1, 6 and 12, aluminum steel part is four layers that are coated togather successively, the quantity of every layer of aluminum steel is 12, 18, 24 and 30, the sectional area of the steel reinforced aluminium conductor made is 1400 square millimeters, 12% is added than prior art, the sectional area of steel core part is 135 square millimeters, 35% is added than prior art, steel reinforced aluminium conductor uniform close after stranded, any surface finish, winding displacement is neat, not loose, conduct electricity very well, ampacity is large, corrosion resistance is strong, long service life, pull-off force can reach 336,000 Ns, fully meet 500 kilovolts, 750 kilovolts, 1000 kilovolts etc. super, performance requirement to wire in UHV transmission line or state key transmission line.
Claims (5)
1. a heavy in section steel reinforced aluminium conductor, be made up of the steel core part of center and aluminum steel part, it is characterized in that: described steel core part is three layers, be made up of central core, internal layer and skin, internal layer is stranded in central core outer rim counterclockwise, skin is stranded in internal layer outer rim clockwise, and central core, internal layer and outer field zinc-coated wire quantity are 1,6 and 12;
Described aluminum steel part is four layers, be made up of innermost layer, adjacent internal layer, adjacent skin and outermost layer, innermost layer is stranded in outer outer rim counterclockwise, adjacent internal layer is stranded in innermost layer outer rim clockwise, adjacent skin is stranded in adjacent internal layer outer rim counterclockwise, outermost layer is stranded in adjacent outer outer rim clockwise, and the quantity of innermost layer, adjacent internal layer, adjacent skin and outermost aluminum steel is 12,18,24 and 30.
2. a kind of heavy in section according to claim 2 steel reinforced aluminium conductor, it is characterized in that: the diameter of every root zinc-coated wire of described steel core part be 2.69 ~ 2.71 millimeters and three layers stranded after sectional area be 135 square millimeters, the diameter of every root aluminum steel of described aluminum steel part is 4.50 ~ 4.53 millimeters and sectional area after aluminum steel part and steel core part compound is 1400 square millimeters.
3. a kind of heavy in section according to claim 3 steel reinforced aluminium conductor, it is characterized in that: the diameter average of described zinc-coated wire is 2.70 millimeters, the weight average of zinc coat is 314 grams/m, tensile strength average is 1731.7 MPas, 1% elongation stress average is 1441 MPas, number of torsions is 29 times, and percentage elongation average is 5.2%.
4. a kind of heavy in section according to claim 3 steel reinforced aluminium conductor, is characterized in that: the diameter average of described aluminum steel is 4.52 millimeters, and tensile strength average is 184 MPas, and strength variance is less than 20 MPas, and resistivity is 27.86.
5. the manufacture method of a kind of heavy in section according to claim 4 steel reinforced aluminium conductor, is characterized in that: comprise and prepare galvanized strand wires, prepare aluminum steel and steel reinforced aluminium conductor is stranded;
The described raw material preparing galvanized strand wires is the wire rod of 65# Φ 6.5 millimeters;
The described raw material preparing aluminum steel is A
8the aluminium bar of Φ 9.50 millimeters, the total draught of drawing is 77.56%, and mean pressure shrinkage is that the 19.22%, 1st passes of drawing is by 9.50 to 9.10,2nd passes of drawing is by 9.10 to 7.97,3rd passes of drawing is by 7.97 to 6.97, and the 4th passes of drawing is by 6.97 to 6.10, and the 5th passes of drawing is by 6.10 to 5.33,6th passes of drawing is by 5.33 to 4.66,7th passes of drawing is by 4.66 to 4.50, and drawing speed is 10 meter per seconds, and rear placement 24 hours made by aluminum steel;
Frame type stranding machine is coiled in the stranded employing 84 of described steel reinforced aluminium conductor;
Steel core part: the external diameter of internal layer is 8.1 millimeters, and pitch is 158 ± 5 millimeters, and lay ratio is 19.51, and direction of lay is counterclockwise; Outer field external diameter is 13.5 millimeters, and pitch is 246 ± 5 millimeters, and lay ratio is 18.22, and direction of lay is clockwise;
Aluminum steel part: the external diameter of innermost layer is 22.5 millimeters, and pitch is 342 ± 5 millimeters, and lay ratio is 15.20, and direction of lay is counterclockwise; The external diameter of adjacent internal layer is 31.5 millimeters, and pitch is 437 ± 5 millimeters, and lay ratio is 13.87, and direction of lay is clockwise; Adjacent outer field external diameter is 40.5 millimeters, and pitch is 495 ± 5 millimeters, and lay ratio is 12.22, and direction of lay is counterclockwise; Outermost external diameter is 49.5 millimeters, and pitch is 562 ± 5 millimeters, and lay ratio is 11.35, and direction of lay is clockwise.
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| CN106251928A (en) * | 2016-08-29 | 2016-12-21 | 四川威鹏电缆制造股份有限公司 | The electricity overhead power transmission line energy-conservation aluminium alloy conductors steel of corrosion-resistant self-damping |
| CN106448835A (en) * | 2016-11-29 | 2017-02-22 | 重庆泰山电缆有限公司 | Super large cross-sectional cable water-blocking conductor |
| CN106486181A (en) * | 2016-11-29 | 2017-03-08 | 重庆泰山电缆有限公司 | A kind of combined round conductor of super-section |
| CN106782767A (en) * | 2016-12-22 | 2017-05-31 | 重庆泰山电缆有限公司 | A kind of heavy in section steel-cored aluminium strand |
| CN107346674A (en) * | 2017-07-22 | 2017-11-14 | 四川中天丹琪科技有限公司 | The method for manufacturing the heavy in section steel core aluminum alloy stranded wire of high conductivity high strength |
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| CN106251928A (en) * | 2016-08-29 | 2016-12-21 | 四川威鹏电缆制造股份有限公司 | The electricity overhead power transmission line energy-conservation aluminium alloy conductors steel of corrosion-resistant self-damping |
| CN106448835A (en) * | 2016-11-29 | 2017-02-22 | 重庆泰山电缆有限公司 | Super large cross-sectional cable water-blocking conductor |
| CN106486181A (en) * | 2016-11-29 | 2017-03-08 | 重庆泰山电缆有限公司 | A kind of combined round conductor of super-section |
| CN106782767A (en) * | 2016-12-22 | 2017-05-31 | 重庆泰山电缆有限公司 | A kind of heavy in section steel-cored aluminium strand |
| CN107346674A (en) * | 2017-07-22 | 2017-11-14 | 四川中天丹琪科技有限公司 | The method for manufacturing the heavy in section steel core aluminum alloy stranded wire of high conductivity high strength |
| CN109338772A (en) * | 2018-11-08 | 2019-02-15 | 武汉钢铁有限公司 | A kind of multilayered structure superhigh intensity galvanized strand wires twisting forming production process |
| CN109338772B (en) * | 2018-11-08 | 2022-01-18 | 武汉钢铁有限公司 | Twisting forming production method for multilayer-structure ultrahigh-strength galvanized steel strand |
| CN109338770A (en) * | 2018-12-11 | 2019-02-15 | 天津冶金集团中兴盛达钢业有限公司 | A kind of long-span electric transmission line super extra-high strong galvanized strand wires and its twisting method |
| CN109338770B (en) * | 2018-12-11 | 2021-12-07 | 天津市新天钢中兴盛达有限公司 | Super-extra-high-strength galvanized steel strand for long-span transmission line |
| CN112863735A (en) * | 2021-01-11 | 2021-05-28 | 四川威鹏电缆制造股份有限公司 | Extra-high voltage steel-cored aluminum stranded wire |
| CN114970150A (en) * | 2022-05-25 | 2022-08-30 | 四川威鹏电缆制造股份有限公司 | Automatic tension feedback technology for paying-off of cable twisted into cable |
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Application publication date: 20151230 |