Copper alloy fiber with lightning protection performance and preparation method thereof
By preparing copper alloy fibers, the problem of insufficient diameter of copper alloy fibers in the prior art was solved, and fibers of 5 microns to 10 microns were successfully prepared, and they were applied to the lightning flash connection system of the wind turbine unit, reducing lightning damage and improving the wind turbine unit security.
Patent Information
- Application Number
- CN202411349169.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-26
- Publication Date
- 2025-01-03
AI Technical Summary
The existing copper alloy fiber diameter cannot reach less than 10 microns, which cannot meet the needs of the lightning flash connection system of the wind turbine unit, resulting in greater damage to the blades caused by lightning strikes and affecting the safety of the wind turbine unit.
By making the preparation method, including stranding wire, coated welding, multiple drawing and annealing, the diameter of the copper-clad copper stranded wire is gradually reduced until the copper alloy fibers are reached from 5 microns to 10 microns, and separated by a copper tape separation mechanism Copper alloy fibers are finally cut into fibers of different lengths in a fiber agitator.
Copper alloy fibers with a diameter of 5 microns to 10 microns were successfully prepared in batches, and applied to lightning flash connection systems to reduce the damage to the blades by lightning strikes and improve the safety of wind turbines.
Smart Images
Figure CN119252530A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of metal materials, and in particular to a copper alloy fiber with lightning protection performance and a preparation method thereof. Background Art
[0002] With the development of wind power generation, its safety has attracted more and more attention. Among them, lightning strike is the most harmful natural disaster to the safe and stable operation of wind turbines. According to statistics, about 20% of wind turbines struck by lightning have damaged blades. Blades are one of the most important components of wind turbines and are also the most vulnerable to lightning strikes. In order to reduce the damage to blades caused by lightning strikes, lightning protection systems are usually installed on the surface or inside the blades. For lightning conductors embedded in the blades, aluminum or copper wires are usually used as conductive materials. Some lightning protection systems require copper alloy fibers with a diameter of less than 10 microns. The minimum diameter of existing copper alloy fibers is between 20 microns and 50 microns, which cannot reach less than 10 microns.
[0003] In view of the above-mentioned related technologies, it is urgently necessary to design and develop a copper alloy fiber with lightning protection performance and a preparation method thereof, which can be used in batches to prepare copper alloy fibers with a diameter of 5 to 10 microns, so as to be easily applied to lightning arrester systems, reduce damage to blades caused by lightning strikes, and thus improve the safety of wind turbines. Summary of the invention
[0004] In order to prepare copper alloy fibers with a diameter of 5 to 10 microns in batches, so as to facilitate their application in lightning protection systems and reduce damage to blades caused by lightning strikes, the present application provides a copper alloy fiber with lightning protection performance and a preparation method thereof.
[0005] In the first aspect, the present application provides a copper alloy fiber body with lightning protection performance adopts the following technical solution: A copper alloy fiber body with lightning protection performance comprises copper alloy fibers with a diameter of 5μm-10μm.
[0006] By adopting the above technical solution, copper alloy fibers with a diameter of 5μm~10μm can be applied to lightning arrester systems to reduce damage to blades caused by lightning strikes, thereby improving the safety of wind turbines.
[0007] In a second aspect, the present application provides a method for preparing a copper alloy fiber with lightning protection performance, which adopts the following technical solution: A method for preparing copper alloy fiber with lightning protection performance comprises the following steps: S1. Prepare pure copper stranded wires, use copper wires with a diameter of 0.1 mm to 1 mm to strand them through a stranding machine, with the center line of the stranded wire as the axis of the single copper wire. First, use 6 to 12 copper wires to strand them in a counterclockwise direction in the first layer, and then use 12 to 18 copper wires to strand them in a clockwise direction in the second layer. Repeat the above steps to finally obtain a stranded wire with a diameter of 9 mm; S2, copper strip coating welding, the copper strip and the pure copper stranded wire with a diameter of 9 mm are cleaned, lubricant is applied on the surface of the copper strip and the surface of the pure copper stranded wire, the copper strip and the pure copper stranded wire are simultaneously connected to the coating welding machine, the copper strip is wheel-rolled into a tubular shape along the longitudinal direction, the pure copper stranded wire is coated with the tubular copper strip, the copper strip and the pure copper stranded wire are welded by a breakpoint gap welding method, and the copper strip and the pure copper stranded wire are coated and welded to obtain a copper-clad copper stranded wire; S3, multi-pass drawing, the copper-clad copper stranded wire is drawn multiple times, so that the diameter of the copper-clad copper stranded wire is reduced to 2~3mm; S4, annealing, annealing the drawn copper clad copper stranded wire, annealing temperature 300℃~450℃, annealing time 30min~1h; S5, drawing again, after the copper-clad copper stranded wire is annealed, continue to draw the copper-clad copper stranded wire for multiple passes until the wire is drawn to 0.5mm~1mm, at which time the internal copper fiber diameter reaches 5μm~10μm; S6, copper strip separation. At the last exit of the drawing, a copper strip separation mechanism is designed. After the copper strip of the copper-clad stranded wire at the head is peeled off, the internal copper alloy fiber and the copper strip are separated by the copper strip separation mechanism. At this time, the diameter of the copper alloy fiber is 5μm~10μm; S7. Cut the copper alloy fiber. Put the prepared copper alloy fiber into a fiber stirrer. Use metal blades to stir and cut the copper fiber. The tiny grooves on the surface of the copper fiber are the breakpoints. Copper fibers of different lengths can be obtained by controlling the stirring speed and stirring time.
[0008] By adopting the above technical scheme, a stranded wire with a diameter of 9 mm is obtained, and a copper-clad copper stranded wire is obtained by coating and welding a copper strip and a pure copper stranded wire. The copper-clad copper stranded wire is drawn multiple times to reduce the diameter of the copper-clad copper stranded wire to 2-3 mm. The drawn copper-clad copper stranded wire is annealed at a temperature of 300°C-450°C for 30 min-1 h. After the copper-clad copper stranded wire is annealed, the copper-clad copper stranded wire is drawn multiple times until the wire is drawn to 0.5 mm-1 mm, at which time the internal copper fiber diameter reaches To 5μm~10μm, a copper strip separation mechanism is designed at the last exit of the drawing. After the copper strip of the copper clad stranded wire at the head is peeled off, the internal copper alloy fiber and the copper strip are separated by the copper strip separation mechanism. At this time, the diameter of the copper alloy fiber is 5μm~10μm. The prepared copper alloy fiber is put into the fiber stirrer, and the metal blades are used to stir and cut the copper fiber. The tiny grooves on the surface of the copper fiber are the breakpoints. Copper fibers of different lengths can be obtained by controlling the stirring speed and stirring time, which is convenient for making copper fibers of different lengths.
[0009] Preferably, the pure copper stranded wire is prepared by using copper wires with a diameter of 0.1mm~1mm to be stranded by a stranding machine, with the center line of the stranded wire as the axis of the single copper wire. The first layer is firstly stranded in a counterclockwise direction using 6~12 copper wires, and the second layer is stranded in a clockwise direction using 12~18 copper wires. The above steps are repeated to finally obtain a stranded wire with a diameter of 1mm-3mm. The obtained stranded wire with a diameter of 1mm-3mm is then cross-twisted left and right, and the above steps are repeated to finally obtain a composite stranded wire with a diameter of 9mm.
[0010] By adopting the above technical scheme, copper wires with a diameter of 0.1mm~1mm are used for stranding through a stranding machine, and the single copper wire takes the center line of the stranded wire as the axis. The first layer uses 6~12 copper wires to be stranded in a counterclockwise direction, and the second layer uses 12~18 copper wires to be stranded in a clockwise direction. The above steps are repeated to finally obtain a stranded wire with a diameter of 1mm-3mm. The obtained stranded wires with a diameter of 1mm-3mm are then cross-twisted left and right, and the above steps are repeated to finally obtain a composite stranded wire with a diameter of 9mm. The twist angle of the stranded wire can be adjusted according to production needs, thereby changing the twist length between each single wire, which is convenient for changing the twist length between each single wire.
[0011] Preferably, the copper strip has a specification of 31.4mm*0.32mm~31.4mm*0.38mm.
[0012] By adopting the above technical solution, the copper tape specification is 31.4mm*0.32mm~31.4mm*0.38mm, which is convenient for covering the composite stranded wire.
[0013] Preferably, the breakpoint gap welding method is to weld the copper strip and the pure copper stranded wire at a certain point, and then weld another welding point 1mm~5mm away from the welding point, and the welding point length range is 1mm~5mm.
[0014] By adopting the above technical solution, after the copper strip and the pure copper stranded wire are welded at a certain point, another welding point is welded 1mm~5mm away from the welding point. The welding point length range is 1mm~5mm, so that the copper skin is easier to peel off during the separation process, helping the internal copper wire to be pulled out smoothly.
[0015] Preferably, in the breakpoint gap welding method, during welding, gas is introduced around the arc at the longitudinal seam of the copper tube, and the gas is argon.
[0016] By adopting the above technical solution, during welding, gas is introduced around the arc at the longitudinal seam of the copper tube, and the gas is argon gas. Therefore, during the welding process, the molten metal will not be oxidized.
[0017] Preferably, the diameter of the copper-clad copper stranded wire is 10 mm.
[0018] By adopting the above technical solution, the diameter of the copper-clad copper stranded wire is 10 mm, which is convenient for drawing the copper-clad copper stranded wire in the later stage.
[0019] Preferably, the multi-pass drawing is performed by a PLC control system using a rear drawing mechanism in which the pure copper stranded wire and the copper strip tube are separately clamped to draw the copper-clad copper stranded wire.
[0020] By adopting the above technical solution and a PLC control system, the external copper strip and the internal pure copper stranded wire are subjected to more uniform force, and the external copper strip and the internal pure copper stranded wire can be coordinated to reduce the warp, ensuring that the size of the internal pure copper stranded wire is uniform during the drawing process.
[0021] Preferably, the copper strip separation mechanism includes an upper take-up wheel driven by a motor and a lower take-up wheel driven by a motor, the upper take-up wheel rotates counterclockwise, and the lower take-up wheel rotates clockwise, the copper strip is wound around the upper take-up wheel, and the copper alloy fibers in the copper strip are wound around the lower take-up wheel, and the surface of the copper alloy fibers has tiny grooves.
[0022] By adopting the above technical solution, the copper belt separation mechanism includes an upper take-up wheel driven by a motor and a lower take-up wheel driven by a motor. The upper take-up wheel rotates counterclockwise and the lower take-up wheel rotates clockwise. The copper belt is wound around the upper take-up wheel, and the copper alloy fibers in the copper belt are wound around the lower take-up wheel. The surface of the copper alloy fibers has tiny grooves, which facilitates the separation of the copper belt and the copper alloy fibers.
[0023] In summary, the present application includes at least one of the following beneficial technical effects: 1. A 9mm diameter stranded wire is obtained, and a copper strip and a pure copper stranded wire are coated and welded to obtain a copper-clad copper stranded wire. The copper-clad copper stranded wire is drawn multiple times to reduce the diameter of the copper-clad copper stranded wire to 2~3mm. The drawn copper-clad copper stranded wire is annealed at a temperature of 300℃~450℃ for 30min~1h. After the copper-clad copper stranded wire is annealed, it is drawn multiple times until the wire is drawn to 0.5mm~1mm. At this time, the internal copper fiber diameter reaches 5μm~10μm. At the last exit of the drawing, the design There is a copper belt separation mechanism. After the copper belt of the copper clad stranded wire at the head is peeled off, the internal copper alloy fiber and the copper belt are separated by the copper belt separation mechanism. At this time, the diameter of the copper alloy fiber is 5μm~10μm. The prepared copper alloy fiber is put into the fiber stirrer, and the copper fiber is stirred and cut by metal blades. The tiny groove marks on the surface of the copper fiber are the breakpoints. Copper fibers of different lengths can be obtained by controlling the stirring speed and stirring time, which is convenient for preparing copper fibers of different lengths. It can be applied to different lightning protection systems to reduce the damage to blades caused by lightning strikes, thereby improving the safety of wind turbines.
[0024] 2. Use copper wires with a diameter of 0.1mm~1mm to be twisted by a twisting machine. The center line of the single copper wire is used as the axis. The first layer uses 6~12 copper wires to be twisted in a counterclockwise direction. The second layer uses 12~18 copper wires to be twisted in a clockwise direction. Repeat the above steps to finally obtain a stranded wire with a diameter of 1mm-3mm. Then, cross-twist the obtained stranded wires with a diameter of 1mm-3mm left and right. Repeat the above steps to finally obtain a composite stranded wire with a diameter of 9mm. The twist angle of the stranded wire can be adjusted according to production needs, thereby changing the twist length between each single wire, which is convenient for changing the twist length between each single wire. Different twist lengths have different stretching effects; 3. The copper belt separation mechanism includes an upper take-up wheel driven by a motor and a lower take-up wheel driven by a motor. The upper take-up wheel rotates counterclockwise and the lower take-up wheel rotates clockwise. The copper belt is wound around the upper take-up wheel, and the copper alloy fibers in the copper belt are wound around the lower take-up wheel. The surface of the copper alloy fibers has tiny grooves, which facilitates the separation of the copper belt and the copper alloy fibers. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 It is a schematic diagram of the overall structure of the copper alloy fiber with a diameter of 5 microns prepared in the embodiment of the present application.
[0026] Figure 2 Schematic diagram of the overall structure of the copper stranded wire-first layer (counterclockwise) in the embodiment of the present application.
[0027] Figure 3 Schematic diagram of the overall structure of the copper stranded wire-second layer (clockwise) in the embodiment of the present application. DETAILED DESCRIPTION
[0028] The following is combined with Figure 1-3 This application is described in further detail.
[0029] The present application embodiment discloses a copper alloy fiber body with lightning protection performance. Figure 1 As shown, the copper alloy fiber body includes copper alloy fibers with a diameter of 5 μm to 10 μm.
[0030] The implementation principle of the copper alloy fiber body with lightning protection performance in the embodiment of the present application is: Copper alloy fibers with a diameter of 5μm~10μm can be used in lightning protection systems to reduce damage to blades caused by lightning strikes, thereby improving the safety of wind turbines.
[0031] Reference Figure 2 and Figure 3 As shown, the embodiment of the present application also discloses a method for preparing a copper alloy fiber with lightning protection performance, comprising the following steps: S1. Prepare pure copper stranded wires, use copper wires with a diameter of 0.1 mm to 1 mm to strand them through a stranding machine, with the center line of the stranded wire as the axis of the single copper wire. First, use 6 to 12 copper wires to strand them in a counterclockwise direction in the first layer, and then use 12 to 18 copper wires to strand them in a clockwise direction in the second layer. Repeat the above steps to finally obtain a stranded wire with a diameter of 9 mm; S2, copper strip coating welding, the copper strip and the pure copper stranded wire with a diameter of 9 mm are cleaned, lubricant is applied on the surface of the copper strip and the surface of the pure copper stranded wire, the copper strip and the pure copper stranded wire are simultaneously connected to the coating welding machine, the copper strip is wheel-rolled into a tubular shape along the longitudinal direction, the pure copper stranded wire is coated with the tubular copper strip, the copper strip and the pure copper stranded wire are welded by a breakpoint gap welding method, and the copper strip and the pure copper stranded wire are coated and welded to obtain a copper-clad copper stranded wire; S3, multi-pass drawing, the copper-clad copper stranded wire is drawn multiple times, so that the diameter of the copper-clad copper stranded wire is reduced to 2~3mm; S4, annealing, annealing the drawn copper clad copper stranded wire, annealing temperature 300℃~450℃, annealing time 30min~1h; S5, drawing again, after the copper-clad copper stranded wire is annealed, continue to draw the copper-clad copper stranded wire for multiple passes until the wire is drawn to 0.5mm~1mm, at which time the internal copper fiber diameter reaches 5μm~10μm; S6, copper strip separation. At the last exit of the drawing, a copper strip separation mechanism is designed. After the copper strip of the copper-clad stranded wire at the head is peeled off, the internal copper alloy fiber and the copper strip are separated by the copper strip separation mechanism. At this time, the diameter of the copper alloy fiber is 5μm~10μm; S7. Cut the copper alloy fiber. Put the prepared copper alloy fiber into a fiber stirrer. Use metal blades to stir and cut the copper fiber. The tiny grooves on the surface of the copper fiber are the breakpoints. Copper fibers of different lengths can be obtained by controlling the stirring speed and stirring time.
[0032] A stranded wire with a diameter of 9 mm is obtained, and a copper-clad copper stranded wire is obtained by coating and welding a copper strip and a pure copper stranded wire. The copper-clad copper stranded wire is drawn multiple times to reduce the diameter of the copper-clad copper stranded wire to 2-3 mm. The drawn copper-clad copper stranded wire is annealed at a temperature of 300°C-450°C for 30 min-1 h. After the copper-clad copper stranded wire is annealed, it is drawn multiple times until the wire is drawn to 0.5 mm-1 mm, at which time the internal copper fiber diameter reaches 5 μm- 10μm. At the last exit of drawing, a copper strip separation mechanism is designed. After the copper strip of the copper clad stranded wire at the head is peeled off, the internal copper alloy fiber and the copper strip are separated by the copper strip separation mechanism. At this time, the diameter of the copper alloy fiber is 5μm~10μm. The prepared copper alloy fiber is put into the fiber stirrer, and the metal blades are used to stir and cut the copper fiber. The tiny groove marks on the surface of the copper fiber are the breakpoints. Copper fibers of different lengths can be obtained by controlling the stirring speed and stirring time, which is convenient for making copper fibers of different lengths.
[0033] Use copper wires with a diameter of 0.1mm~1mm to be twisted by a twisting machine. The center line of the single copper wire is used as the axis. The first layer uses 6~12 copper wires to be twisted in a counterclockwise direction. The second layer uses 12~18 copper wires to be twisted in a clockwise direction. The above steps are repeated to finally obtain a stranded wire with a diameter of 1mm-3mm. The stranded wires with a diameter of 1mm-3mm are then cross-twisted left and right. The above steps are repeated to finally obtain a composite stranded wire with a diameter of 9mm. The twist angle of the stranded wire can be adjusted according to production needs, thereby changing the twist length between each single wire, which is convenient for changing the twist length between each single wire.
[0034] The copper tape specifications are 31.4mm*0.32mm~31.4mm*0.38mm, which is convenient for covering the composite stranded wire.
[0035] After welding the copper strip and the pure copper stranded wire at a certain point, another welding point is welded 1mm~5mm away from this welding point. The welding point length range is 1mm~5mm, so that the copper skin is easier to peel off during the separation process, helping the internal copper wire to be pulled out smoothly.
[0036] During welding, gas is introduced around the arc at the longitudinal seam of the copper tube. The gas is argon, so the molten metal will not be oxidized during the welding process.
[0037] The diameter of the copper-clad copper stranded wire is 10 mm, which is convenient for drawing the copper-clad copper stranded wire later.
[0038] By adopting the PLC control system, the external copper belt and the internal pure copper stranded wire are subjected to more uniform force, which can make the external copper belt and the internal pure copper stranded wire reduce the warp synergistically, ensuring that the size of the internal pure copper stranded wire is uniform during the drawing process.
[0039] The copper belt separation mechanism includes an upper take-up wheel driven by a motor and a lower take-up wheel driven by a motor. The upper take-up wheel rotates counterclockwise and the lower take-up wheel rotates clockwise. The copper belt is wound around the upper take-up wheel, and the copper alloy fibers in the copper belt are wound around the lower take-up wheel. The surface of the copper alloy fibers has tiny grooves, which facilitates the separation of the copper belt and the copper alloy fibers.
[0040] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. A copper alloy fiber body with lightning protection performance, characterized in that: Including copper alloy fibers with a diameter of 5μm~10μm.
2. A method for preparing a copper alloy fiber with lightning protection performance, according to the copper alloy fiber body with lightning protection performance according to claim 1, characterized in that: The steps include: S1. Prepare pure copper stranded wires, use copper wires with a diameter of 0.1 mm to 1 mm to strand them through a stranding machine, with the center line of the stranded wire as the axis of the single copper wire. First, use 6 to 12 copper wires to strand them in a counterclockwise direction in the first layer, and then use 12 to 18 copper wires to strand them in a clockwise direction in the second layer. Repeat the above steps to finally obtain a stranded wire with a diameter of 9 mm; S2, copper strip coating welding, the copper strip and the pure copper stranded wire with a diameter of 9 mm are cleaned, lubricant is applied on the surface of the copper strip and the surface of the pure copper stranded wire, the copper strip and the pure copper stranded wire are simultaneously connected to the coating welding machine, the copper strip is wheel-rolled into a tubular shape along the longitudinal direction, the pure copper stranded wire is coated with the tubular copper strip, the copper strip and the pure copper stranded wire are welded by a breakpoint gap welding method, and the copper strip and the pure copper stranded wire are coated and welded to obtain a copper-clad copper stranded wire; S3, multi-pass drawing, the copper-clad copper stranded wire is drawn multiple times, so that the diameter of the copper-clad copper stranded wire is reduced to 2~3mm; S4, annealing, annealing the drawn copper clad copper stranded wire, annealing temperature 300℃~450℃, annealing time 30min~1h; S5, drawing again, after the copper-clad copper stranded wire is annealed, continue to draw the copper-clad copper stranded wire for multiple passes until the wire is drawn to 0.5mm~1mm, at which time the internal copper fiber diameter reaches 5μm~10μm; S6, copper strip separation. At the last exit of the drawing, a copper strip separation mechanism is designed. After the copper strip of the copper-clad stranded wire at the head is peeled off, the internal copper alloy fiber and the copper strip are separated by the copper strip separation mechanism. At this time, the diameter of the copper alloy fiber is 5μm~10μm; S7. Cut the copper alloy fiber. Put the prepared copper alloy fiber into a fiber stirrer. Use metal blades to stir and cut the copper fiber. The tiny grooves on the surface of the copper fiber are the breakpoints. Copper fibers of different lengths can be obtained by controlling the stirring speed and stirring time.
3. The method for preparing a copper alloy fiber with lightning protection performance according to claim 2, characterized in that: The pure copper stranded wire is prepared by using a stranding machine to strand copper wires with a diameter of 0.1 mm to 1 mm, with the center line of the stranded wire as the axis of the single copper wire. The first layer is firstly stranded in a counterclockwise direction using 6 to 12 copper wires, and the second layer is stranded in a clockwise direction using 12 to 18 copper wires. The above steps are repeated to finally obtain stranded wires with a diameter of 1 mm to 3 mm. The stranded wires with a diameter of 1 mm to 3 mm are then cross-twisted left and right, and the above steps are repeated to finally obtain a composite stranded wire with a diameter of 9 mm.
4. The method for preparing a copper alloy fiber with lightning protection performance according to claim 2, characterized in that: The copper strip has a specification of 31.4mm*0.32mm~31.4mm*0.38mm.
5. The method for preparing a copper alloy fiber with lightning protection performance according to claim 2, characterized in that: The breakpoint gap welding method is to weld the copper strip and the pure copper stranded wire at a certain point, and then weld another welding point 1mm to 5mm away from the welding point, and the length range of the welding point is 1mm to 5mm.
6. The method for preparing a copper alloy fiber with lightning protection performance according to claim 5, characterized in that: In the breakpoint gap welding method, during welding, gas is introduced around the arc at the longitudinal seam of the copper tube, and the gas is argon.
7. The method for preparing a copper alloy fiber with lightning protection performance according to claim 2, characterized in that: The diameter of the copper-clad copper stranded wire is 10 mm.
8. The method for preparing a copper alloy fiber with lightning protection performance according to claim 2, characterized in that: The multi-pass drawing is performed by a PLC control system and a rear drawing mechanism in which the pure copper stranded wire and the copper strip tube are separately clamped to draw the copper-clad copper stranded wire.
9. The method for preparing a copper alloy fiber with lightning protection performance according to claim 2, characterized in that: The copper strip separation mechanism includes an upper take-up wheel driven by a motor and a lower take-up wheel driven by a motor. The upper take-up wheel rotates counterclockwise and the lower take-up wheel rotates clockwise. The copper strip is wound around the upper take-up wheel, and the copper alloy fibers in the copper strip are wound around the lower take-up wheel. The surface of the copper alloy fibers has tiny grooves.