CN114927288A - Steel-cored aluminum strand annealing device and annealing process - Google Patents
Steel-cored aluminum strand annealing device and annealing process Download PDFInfo
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- CN114927288A CN114927288A CN202210650348.XA CN202210650348A CN114927288A CN 114927288 A CN114927288 A CN 114927288A CN 202210650348 A CN202210650348 A CN 202210650348A CN 114927288 A CN114927288 A CN 114927288A
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Abstract
The invention belongs to the technical field of overhead transmission conductors, and particularly relates to an annealing process of a steel-cored aluminum strand, which comprises the following processes: the steel core wire is pulled to drive the steel core aluminum stranded wire which is stranded in advance to a pay-off reel of a pay-off device; starting a plurality of heaters for preheating, and starting a wire releasing device and a wire collecting device after the preset annealing temperature is reached; and through the operations of coiling and uncoiling, the steel-cored aluminum strand is sequentially subjected to segmented temperature rise annealing treatment through a plurality of heaters with different temperatures and is stored on a take-up reel of a take-up device. According to the invention, the plurality of heaters are arranged, the temperature presentation of the adjacent heaters is subjected to a heating design, and the heating annealing of the passing stranded wire is realized in a segmented manner.
Description
Technical Field
The invention belongs to the technical field of overhead transmission conductors, and particularly relates to an annealing device and an annealing process for steel-cored aluminum strands.
Background
With the rapid development of economy in China, the demand for electric power is increasing day by day, the scale of a power transmission network is also continuously enlarged, and the loss of the power network becomes huge. For power grid enterprises, the method has obvious economic value and social benefit for reducing the loss of the power grid. An important trend in the art of overhead power transmission conductors is energy conservation. Compared with the traditional aluminum cable steel-cored wire, the electrical conductivity of aluminum in the traditional aluminum cable steel-cored wire is 61% IACS, and the electrical conductivity of the aluminum in the aluminum cable steel-cored wire can reach 63% IACS, so that the aluminum cable steel-cored wire has lower resistance loss than the aluminum cable steel-cored wire under the same section of wire.
At present, the annealing treatment is mostly to place the whole coil of steel-cored aluminum strand needing annealing in a closed annealing furnace, the temperature of the annealing furnace is the target annealing temperature, but the problem of nonuniform annealing between the inner layer and the outer layer of the steel-cored aluminum strand in the wire coil caused by one-time annealing is found in the actual production process.
Disclosure of Invention
In view of the above problems, the present invention provides an annealing device for steel-cored aluminum strand,
the device comprises a paying-off device, a wire take-up device and a plurality of heaters, wherein the plurality of heaters are sequentially arranged between the paying-off device and the wire take-up device, and the plurality of heaters are used for annealing the aluminum stranded wires for multiple times at different temperatures; the paying-off device is provided with a paying-off disc, and the take-up device is provided with a take-up disc.
Furthermore, a plurality of supporting and clamping structures are further arranged, and each supporting and clamping structure comprises a guide wheel set which is arranged oppositely from top to bottom. According to another aspect of the invention, an integral annealing process for steel-cored soft aluminum stranded wires is provided, wherein the annealing device is adopted, and the specific process flow is as follows:
the steel core wire is pulled to drive the steel core aluminum stranded wire which is stranded in advance to a pay-off reel of a pay-off device;
starting a plurality of heaters for preheating, wherein the annealing temperatures of adjacent heaters are different and are in a heating design; starting the wire releasing device and the wire collecting device after the respective annealing temperatures are reached; and through the operations of coiling and uncoiling, the steel-cored aluminum strand is subjected to segmented temperature rise annealing treatment sequentially through the heaters and is finally stored on a coiling disc.
Furthermore, the annealing temperature range of the first heater after the wire is paid off by the paying-off device is 95-105 ℃, and the temperature of the adjacent heaters is increased by 80-100 ℃.
Further, during annealing, the take-up speed is the same as the pay-off speed.
Furthermore, the take-up speed and the pay-off speed are controlled to be 15-25 m/min.
Further, the annealing temperature of the heater close to the wire take-up device is 370-380 ℃.
Further, the number of heaters was set to 4; wherein the temperature range of the first heater is 95-100 ℃, the temperature range of the second heater is 195-200 ℃, the temperature range of the third heater is 295-300 ℃, and the temperature range of the fourth heater is 370-380 ℃.
Furthermore, the steel-cored aluminum strand is manufactured by drawing an aluminum rod into a hard aluminum wire and then twisting the hard aluminum wire and the steel-cored wire.
Further, the steel core comprises galvanized steel strands, zinc-aluminum alloy coating steel strands and aluminum-clad steel strands; the hard aluminum wire comprises a round wire, T-shaped and S, Z molded wire form.
The invention has the advantages that: through the arrangement of the plurality of heaters, the temperature presentation of each heater is in a temperature rise design, the segmented temperature rise annealing of the stranded wire is realized, the annealing uniformity problem between the inner layer and the outer layer of the stranded wire in the wire coil can be solved by producing the steel-cored soft aluminum stranded wire through the process, and the conductivity of the steel-cored aluminum stranded wire is improved.
Drawings
FIG. 1 is a schematic structural diagram of an annealing apparatus according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of the annealing process of the present invention.
In the drawing, 1-a pay-off device, 2-a pay-off reel, 3-a take-up device, 4-a take-up reel, 5-a stranded wire, 6-a supporting and clamping structure, 7-a first heater, 8-a second heater, 9-a third heater and 10-a fourth heater.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, the invention provides an aluminum conductor steel reinforced annealing device, which comprises a wire releasing device 1, a wire winding device 3 and a plurality of heaters, wherein the plurality of heaters are sequentially arranged between the wire releasing device 1 and the wire winding device 3, and the plurality of heaters are used for annealing aluminum conductor steel reinforced wires for multiple times at different temperatures; and the pay-off device 1 is provided with a pay-off reel 2, and the take-up device 3 is provided with a take-up reel 4.
Based on the annealing device, referring to fig. 2, the invention provides an annealing process for steel-cored aluminum strands, which comprises the following specific processes that steel-cored aluminum strands 5 which are stranded in advance are driven to a pay-off reel 4 of a pay-off device 1 by drawing the steel-cored wires;
starting a plurality of heaters for preheating, wherein the annealing temperatures of adjacent heaters are different and are in a heating design, and starting the pay-off device 1 and the take-up device 3 after the annealing temperatures set by the heaters are reached; through the operations of coiling and uncoiling, the steel-cored aluminum strand 5 is subjected to segmented heating annealing treatment sequentially through the heaters and finally is stored on the take-up reel 4 of the take-up device 3.
The pre-stranded steel-cored aluminum strand sequentially passes through the plurality of heaters, the temperature of each heater is presented by a heating design, and the stranded wire passing through the heaters is subjected to segmented heating annealing, so that the problem of annealing uniformity between the inner layer and the outer layer of the stranded wire in the wire coil is effectively solved, and the conductivity of the steel-cored aluminum strand is improved.
As a modification of the scheme, in order to enable the travelling stranded wire 5 to have certain tension, a plurality of supporting and clamping structures 6 are further arranged between the stranded wire 5 from the pay-off device 1 to the take-up device 3, and the supporting and clamping structures 6 comprise guide wheel sets which are oppositely arranged up and down. The steel-cored aluminum strand 5 passes between the two guide wheel sets, and the two guide wheel sets respectively have certain clamping force on the strand 5 from the upper direction and the lower direction. The main function of the clamping structure is that the stranded wire is straight in the whole treatment process, and the heating treatment is more uniform on the longitudinal section of the wire.
As an improvement of the scheme, in order to improve the annealing uniformity and achieve the effect of layer-by-layer permeability annealing, a plurality of heaters are adopted in the annealing device in the scheme, and the specific set number of the heaters is set according to the final annealing temperature of the steel-cored aluminum strand 5. Wherein the initial temperature of a first heater through which the steel-cored aluminum strand coming out of the pay-off reel passes is 95-105 ℃, and the temperature of sequentially adjacent heaters is increased by 80-100 ℃.
As an improvement of the scheme, a mainstream process route of the existing aluminum conductor steel reinforced 5 is to form a hard aluminum wire by drawing an aluminum rod, form a soft aluminum wire by annealing, and strand the annealed soft aluminum wire with the steel core to prepare the aluminum conductor steel reinforced 5. The technology is adopted to produce the soft aluminum single wire, and then the soft aluminum single wire is twisted with the steel core. Because the strength of the soft aluminum wire is low, the soft aluminum shape is changed under the action of the tension of the stranded wire 5 in the stranding process, the structure of the whole stranded wire 5 is unstable, and certain internal stress appears. In the annealing scheme, the steel-cored aluminum strand is prepared by drawing an aluminum rod into a hard aluminum wire and then twisting the hard aluminum wire and the steel-cored wire, wherein a plurality of steel-cored wires are twisted together; the hard aluminum wire is formed by twisting a plurality of aluminum single wires on the periphery of a steel core wire to form an aluminum conductor steel-reinforced strand, and annealing treatment is carried out by a heater, so that the problem of deformation caused by unstable structure of the aluminum conductor steel-reinforced strand 5 in the prior art is effectively solved.
As an improvement of the scheme, in order to guarantee the annealing time of the steel-cored aluminum strand 5, the coiling and uncoiling speeds are controlled to be 15 m/min-25 m/min. The paying-off speed is mainly used for guaranteeing the annealing time of the stranded wire 5.
As an improvement of the scheme, the annealing temperature of the heater close to the take-up device, namely the heater through which the steel-cored aluminum strand finally passes, is set to be 370-380 ℃. Too low an annealing temperature requires a longer time to achieve the annealing effect. Too high a temperature will have an effect on the steel core galvanizing layer, the melting point of the coating is typically 400 degrees, and too high a temperature will cause damage to the steel core galvanizing layer.
Example 1:
1. and placing the whole disk of the steel-cored aluminum stranded wire 5 with the specification of JL/G1A-400/35 on the pay-off disk 2 of the pay-off device 1. The steel-cored aluminum strand 5 is connected with a steel wire at the head end, and the steel wire is used for traction in the annealing process.
2. And starting the heaters, controlling the temperature range of the first heater 7 to be 95-100 ℃, the temperature range of the second heater 8 to be 195-200 ℃, the temperature of the third heater 97-3 to be 295-300 ℃ and the temperature of the fourth heater 10 to be 370-380 ℃.
3. Starting the winding and unwinding device, controlling the winding and unwinding tension to be 2kN, ensuring that the stranded wire 5 can smoothly pass through the first heater 7-the fourth heater 10 from the pay-off reel 2 of the unwinding device 1, and controlling the winding and unwinding linear speed of the stranded wire 5 to be 20 m/min.
4. And when the stranded wire 5 is placed on the take-up reel 4 of the take-up device 3, removing the traction steel wire on the take-up reel 4.
5. And after the stranded wires 5 of the pay-off device 1 are completely paid off from the pay-off reel 2, connecting the stranded wires 5 to be treated in the next reel, taking out the take-up reel 4 of the take-up device 3 after the take-up reel 4 is fully wound, and finishing the annealing process of the steel core soft aluminum stranded wires 5.
The performance of the aluminum wire of the steel core wire soft aluminum stranded wire 5 is detected, the electric conductivity is 63.4 percent IACS, and the tensile strength is 80 MPa. Meets the requirements.
Example 2:
1. the whole disc of aluminum-clad steel core aluminum stranded wires 5 with the specification of JL/LB20A-630/45 is placed on an unwinding disc 2, and the stranded wires 5 are connected to an empty take-up disc 4 on a take-up device 3 through traction steel wires.
2. Starting the frequency doubling heater, controlling the temperature range of the first heater 7 to be 100-105 ℃, controlling the temperature range of the second heater 8 to be 200-205 ℃, controlling the temperature of the third heater 9 to be 300-305 ℃ and controlling the temperature of the fourth heater 10 to be 370-380 ℃.
3. And starting the wire winding and unwinding device, controlling the winding and unwinding tension to be 3kN, ensuring that the stranded wire 5 can smoothly pass through the first heater 7-the fourth heater 10 from a wire coil of the wire unwinding device, and controlling the winding and unwinding linear speed of the stranded wire 5 to be 15 m/min.
4. And when the stranded wires 5 are placed on the empty wire coil on the wire take-up frame, removing the traction steel wires on the wire take-up frame 4.
5. And after the stranded wires 5 of the pay-off rack are completely paid out from the wire coil, connecting the stranded wires 5 to be treated of the next coil, taking out the wire coil of the take-up rack after the take-up reel 4 is fully wound, and finishing the annealing process of the steel-cored soft aluminum stranded wires 5.
And the performance of the aluminum wire of the steel wire soft aluminum stranded wire 5 is detected, the electric conductivity is 63.4 percent IACS, and the tensile strength is 82 MPa. Meets the requirements.
Comparative example:
the length of each aluminum single wire is 2550m, the total number of the aluminum single wires of 48 disks is used as performance test sample data, conductivity performance tests are carried out on the 48 single aluminum single wires before annealing, as shown in a table 1-1, and the average conductivity of the aluminum single wires before annealing is 61.58IACS according to the data in the table.
The existing process is adopted, namely, annealing is carried out on each disk of aluminum single wires before stranding to form soft aluminum single wires, the annealing temperature is 380 ℃, 24 disks of annealing are carried out each time, each annealing time is 4.5 hours, and 9 hours are needed after 48 disks of annealing. The 48 soft aluminum single wires annealed by the annealing process were subjected to performance testing, and as shown in tables 1-2, the average conductivity was 63.06 IACS.
The total length of the steel-cored aluminum strand is 2550m, 48 aluminum single wires are integrally stranded on the periphery of the steel-cored wire, the annealing time is 2.83h through the annealing process of the scheme, and the annealing process has the average conductivity of 63.35IACS and better conductivity through performance tests on the 48 aluminum single wires as shown in tables 1-3.
TABLE 1-1 aluminum Single wire conductivity before annealing
TABLE 1-2 post-anneal aluminum single wire conductivity (Current annealing Process)
TABLE 1-3 Single wire conductivity of annealed aluminum (this patent art)
Through the comparison of the tests, the steel-cored aluminum strand annealed by the annealing process has the optimal conductivity, and is in line with the design expectation of a scheme.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides an aluminum conductor steel reinforced annealing device which characterized in that: the aluminum stranded wire annealing device comprises a paying-off device, a taking-up device and a plurality of heaters, wherein the plurality of heaters are sequentially arranged between the paying-off device and the taking-up device, and the plurality of heaters are used for annealing aluminum stranded wires for multiple times at different temperatures; and the pay-off device is provided with a pay-off reel, and the take-up device is provided with a take-up reel.
2. The steel-cored aluminum strand annealing device according to claim 1, wherein: the device is also provided with a plurality of supporting and clamping structures, and each supporting and clamping structure comprises a guide wheel set which is arranged oppositely from top to bottom.
3. An annealing process of steel-cored aluminum strand, which is characterized in that: the method comprises the following steps of,
the steel core wire is pulled to drive the steel core aluminum stranded wire which is stranded in advance to a pay-off reel of a pay-off device;
starting a plurality of heaters for preheating, wherein the annealing temperatures of adjacent heaters are different and are in a heating design; starting the wire releasing device and the wire collecting device after the respective annealing temperatures are reached; and through the operations of coiling and uncoiling, the steel-cored aluminum strand is sequentially subjected to segmented heating annealing treatment by the plurality of heaters and finally is stored on a take-up reel.
4. The aluminum conductor steel reinforced annealing process of claim 3, wherein: wherein the annealing temperature range of the first heater after the wire is paid off by the wire paying-off device is 95-105 ℃, and the temperature of the adjacent heaters is increased by 80-100 ℃.
5. The aluminum conductor steel reinforced annealing process of claim 3, wherein: and during annealing, the wire take-up speed is the same as the wire release speed.
6. The aluminum conductor steel reinforced annealing process of claim 5, wherein: the take-up speed and the pay-off speed are controlled to be 15 m/min-25 m/min.
7. The aluminum conductor steel reinforced annealing process of claim 4, wherein: the annealing temperature of the heater close to the take-up device is 370-380 ℃.
8. The aluminum conductor steel reinforced annealing process of claim 7, wherein: the number of heaters is set to 4; wherein the temperature range of the first heater is 95-100 ℃, the temperature range of the second heater is 195-200 ℃, the temperature range of the third heater is 295-300 ℃, and the temperature range of the fourth heater is 370-380 ℃.
9. The aluminum conductor steel reinforced annealing process of claim 3, wherein: the steel-cored aluminum strand is manufactured by drawing an aluminum rod into a hard aluminum wire and then twisting the hard aluminum wire and the steel-cored wire.
10. The aluminum conductor steel reinforced annealing process of claim 9, wherein: the steel core wire comprises galvanized steel strands, zinc-aluminum alloy coating steel strands and aluminum-clad steel strands; the hard aluminum wire comprises a round wire, T-shaped, S, Z type wire form.
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| CN202210650348.XA CN114927288A (en) | 2022-06-09 | 2022-06-09 | Steel-cored aluminum strand annealing device and annealing process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117275833A (en) * | 2023-11-07 | 2023-12-22 | 黄冈兴和电线电缆有限公司 | Low-sag extra-strong steel-cored soft aluminum stranded wire and production process thereof |
| CN117467833A (en) * | 2023-12-28 | 2024-01-30 | 尚纬股份有限公司 | Online continuous annealing device and method for stranded aluminum alloy conductor |
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2022
- 2022-06-09 CN CN202210650348.XA patent/CN114927288A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117275833A (en) * | 2023-11-07 | 2023-12-22 | 黄冈兴和电线电缆有限公司 | Low-sag extra-strong steel-cored soft aluminum stranded wire and production process thereof |
| CN117275833B (en) * | 2023-11-07 | 2024-03-22 | 黄冈兴和电线电缆有限公司 | Low-sag extra-strong steel-cored soft aluminum stranded wire and production process thereof |
| CN117467833A (en) * | 2023-12-28 | 2024-01-30 | 尚纬股份有限公司 | Online continuous annealing device and method for stranded aluminum alloy conductor |
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