Preparation method of optical fiber composite overhead ground wire and optical fiber composite overhead ground wire

Abstract

The invention provides a preparation method of an optical fiber composite overhead ground wire and the optical fiber composite overhead ground wire, and the preparation method of the optical fiber composite overhead ground wire comprises the following steps: providing an aluminum strip, and wrapping the aluminum strip at the periphery of a stainless steel tube optical unit; the aluminum strip and the stainless steel pipe optical unit are welded through a laser continuous welding technology to form an aluminum-clad steel pipe optical unit; performing a continuous drawing process on the aluminum-clad steel pipe of the aluminum-clad steel pipe optical unit; and twisting the drawn aluminum-clad steel pipe optical unit with a metal monofilament, wherein the outer layer of the metal monofilament and the aluminum layer of the aluminum-clad steel pipe optical unit are made of the same material.

Description

Technical Field

[0001] The present application relates to the technical field of optical fiber composite overhead ground wires, and in particular to a preparation method of an optical fiber composite overhead ground wire and the optical fiber composite overhead ground wire. Background Art

[0002] Fiber-optic composite overhead ground wires are typically constructed by twisting a communication optical unit with a metal wire. Due to the material dissimilarities between the optical unit and the metal wire, electrochemical corrosion is prone to occur. Currently, most manufacturers apply an anti-corrosion cable paste during the twisting process. However, this anti-corrosion cable paste is susceptible to aging due to long-term exposure to factors such as rain, UV radiation, and high temperatures, reducing its corrosion resistance and shortening the service life of the fiber-optic composite overhead ground wire. Summary of the Invention

[0003] The present application provides a preparation method of an optical fiber composite overhead ground wire and an optical fiber composite overhead ground wire, so as to solve the problem in the prior art that the optical fiber composite overhead ground wire is easily affected by electrochemical corrosion and has a short service life.

[0004] The present application provides a method for preparing an optical fiber composite overhead ground wire, comprising the following steps: providing an aluminum strip, and wrapping the aluminum strip around the outer periphery of a stainless steel tube optical unit; welding the aluminum strip to the stainless steel tube optical unit using a continuous laser welding process to form an aluminum-clad steel tube optical unit; performing a continuous drawing process on the aluminum-clad steel tube of the aluminum-clad steel tube optical unit; and twisting the drawn aluminum-clad steel tube optical unit with a metal monofilament, wherein the outer layer of the metal monofilament is made of the same material as the aluminum layer of the aluminum-clad steel tube optical unit.

[0005] In a possible embodiment, the laser welding power is 800W to 950W, the laser welding speed is 8m / min to 15m / min, the laser operating wavelength is short wave, and the welding heat power of the aluminum strip is 30J / mm to 100J / mm.

[0006] In a possible implementation, the operating wavelength of the laser is 532 nm.

[0007] In a possible implementation, after the aluminum-clad steel tube of the aluminum-clad steel tube optical unit is subjected to a continuous drawing process, the aluminum-clad steel tube is subjected to online flaw detection, and the welding power and welding speed of the laser are dynamically adjusted based on the flaw detection results.

[0008] In a possible implementation, the thickness of the aluminum strip is 0.1 mm to 0.35 mm, and after the aluminum-clad steel tube of the aluminum-clad steel tube optical unit is subjected to a continuous drawing process, the diameter of the aluminum-clad steel tube optical unit is 1.2 mm to 8 mm.

[0009] In a possible embodiment, the aluminum strip is wrapped around the outer periphery of the stainless steel tube light unit after being paid out, and the tension of the aluminum strip is adjusted by a first tension adjustment device during the pay-out process so that the tension of the aluminum strip is within the range of 0.2 kg to 0.8 kg.

[0010] In a possible implementation manner, after the tension of the aluminum strip is adjusted, the method further includes the following steps: Performing a cleaning operation on the aluminum strip; The aluminum strip is cut into pieces.

[0011] In a possible embodiment, the stainless steel tube light unit is wrapped by the aluminum tape after pay-off, and the tension of the stainless steel tube light unit is adjusted by a second tension adjustment device during the pay-off process so that the tension of the stainless steel tube light unit is within the range of 2 kg to 8 kg.

[0012] The present application also provides a fiber-optic composite overhead ground wire, which is prepared using the above-mentioned fiber-optic composite overhead ground wire preparation method. The fiber-optic composite overhead ground wire includes an aluminum-clad steel tube optical unit and a plurality of metal monofilaments. The plurality of metal monofilaments are arranged around the outer periphery of the aluminum-clad steel tube optical unit, and the material of the outer layer of the metal monofilament is the same as the material of the aluminum layer of the aluminum-clad steel tube optical unit.

[0013] In a possible implementation, the metal monofilament is an aluminum-clad steel wire, an aluminum wire, or an aluminum alloy wire.

[0014] The preparation method of the optical fiber composite overhead ground wire of the present application is to weld a layer of aluminum tape on the periphery of the stainless steel tube optical unit. The material of the aluminum tape is the same as the material of the outer layer of the metal monofilament to avoid electrochemical corrosion caused by direct contact between the stainless steel tube optical unit and the metal monofilament, thereby improving the service life of the optical fiber composite overhead ground wire. In addition, the aluminum tape is welded to the periphery of the stainless steel tube optical unit using a laser continuous welding process, which can avoid damage to the aluminum tape while ensuring the welding quality, further ensuring the service life of the optical fiber composite overhead ground wire. The aluminum-clad steel tube of the aluminum-clad steel tube optical unit formed after welding is then subjected to a continuous drawing process to improve the performance of the aluminum layer and reduce the interface bonding gap between the stainless steel tube and the aluminum layer to avoid damage during the subsequent twisting operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of an optical fiber composite overhead ground wire according to an embodiment of the present application. In the figure, the third metal monofilament is an aluminum-clad steel wire.

[0016] Figure 2 This is a schematic structural diagram of an optical fiber composite overhead ground wire according to an embodiment of the present application, in which the third metal monofilament is an aluminum wire.

[0017] Figure 3FIG. 1 is a schematic diagram of the processing steps of a method for preparing an optical fiber composite overhead ground wire according to an embodiment of the present invention.

[0018] Figure 4 FIG. 1 is a schematic diagram of a process flow of a method for preparing an optical fiber composite overhead ground wire according to an embodiment of the present invention.

[0019] Explanation of main component symbols: 100, optical fiber composite overhead ground wire; 200, preparation method of optical fiber composite overhead ground wire; 10, aluminum-clad steel tube optical unit; 11, optical fiber; 12, stainless steel tube; 13, aluminum layer; 20, metal monofilament; 21, first metal monofilament; 22, second metal monofilament; 23, third metal monofilament.

[0020] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0021] The following description will refer to the accompanying drawings to more fully describe the contents of this application. Illustrated in the accompanying drawings are exemplary embodiments of the present application. However, the present application can be implemented in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided to make this application thorough and complete and to fully convey the scope of this application to those skilled in the art. Like reference numerals represent identical or similar components.

[0022] The terms used herein are for the purpose of describing specific exemplary embodiments only and are not intended to limit the present application. As used herein, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms as well. In addition, when used herein, "includes" and / or "comprising" and / or "having" integers, steps, operations, components and / or components do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, components and / or groups thereof.

[0023] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. In addition, unless explicitly defined herein, terms such as those defined in common dictionaries should be interpreted as having a meaning consistent with their meaning in the relevant art and the context of this application, and will not be interpreted as idealized or overly formal meanings.

[0024] The specific implementation methods of the present application will be described in further detail below with reference to the accompanying drawings.

[0025] like Figures 1 to 2As shown, this embodiment provides a fiber-optic composite overhead ground wire 100, comprising an aluminum-clad steel tube optical unit 10 and a plurality of metal monofilaments 20. The plurality of metal monofilaments 20 are disposed around the outer periphery of the aluminum-clad steel tube optical unit 10. The outer layer of the metal monofilaments 20 is made of the same material as the aluminum layer 13 of the aluminum-clad steel tube optical unit 10. Specifically, the metal monofilaments 20 are aluminum-clad steel wires, aluminum wires, or aluminum alloy wires.

[0026] In this embodiment, the aluminum-clad steel tube optical unit 10 includes a stainless steel tube 12, an optical fiber 11 extending through the tube, and an aluminum layer 13 surrounding the outer periphery of the tube. Multiple optical fibers 11 can be included, with the specific number determined based on actual needs. Furthermore, the stainless steel tube 12 can be filled with fiber grease to ensure the stability of the optical fibers 11.

[0027] The metal monofilaments 20 include a first metal monofilament 21, a second metal monofilament 22, and a third metal monofilament 23. The first metal monofilament 21 is located at the center of the optical fiber composite overhead ground wire 100. Two aluminum-clad steel tube optical units 10 are provided, radially disposed on either side of the first metal monofilament 21. The first metal monofilament 21 is an aluminum-clad steel wire, but may also be aluminum wire or an aluminum alloy wire.

[0028] Multiple second metal monofilaments 22 are located in the same layer as the aluminum-clad steel tube optical unit 10. The second metal monofilaments 22 fill the circumferential space between the two aluminum-clad steel tube optical units 10. Thus, the second metal monofilaments 22 are twisted with the two aluminum-clad steel tube optical units 10 and then arranged around the outer periphery of the first metal monofilaments 21, forming an inner layer structure. The second metal monofilaments 22 may be aluminum-clad steel wire, but may also be aluminum wire or aluminum alloy wire.

[0029] The third metal monofilaments 23 are multiple in number and are twisted around the outer periphery of the inner layer structure to form the outer layer structure. The third metal monofilaments 23 can be aluminum-clad steel wires, aluminum wires, or aluminum alloy wires.

[0030] It is understandable that in some embodiments, the number of aluminum-clad steel tube optical units 10 can also be set to one, and the aluminum-clad steel tube optical unit 10 is located at the center of the optical fiber composite overhead ground wire 100, and multiple metal monofilaments 20 are twisted around the periphery of the aluminum-clad steel tube optical unit 10.

[0031] It is understandable that in other embodiments, the number of the aluminum-clad steel tube light units 10 may also be set to one or more, and the number and position of the aluminum-clad steel tube light units 10 may be selected according to actual needs.

[0032] like Figures 1 to 3As shown, this embodiment further provides a method 200 for preparing an optical fiber composite overhead ground wire, which is used to prepare the optical fiber composite overhead ground wire 100 .

[0033] The method 200 for preparing an optical fiber composite overhead ground wire comprises the following steps: S1. Provide aluminum tape and wrap the aluminum tape around the outer periphery of the stainless steel tube light unit.

[0034] S2. The aluminum strip and the stainless steel tube light unit are welded by a laser continuous welding process to form an aluminum-clad steel tube light unit 10.

[0035] S3. Perform a continuous drawing process on the aluminum-clad steel tube of the aluminum-clad steel tube optical unit 10.

[0036] S4 , twisting the drawn aluminum-clad steel tube optical unit 10 with the metal monofilament 20 , wherein the outer layer of the metal monofilament 20 is made of the same material as the aluminum layer 13 of the aluminum-clad steel tube optical unit 10 .

[0037] Thus, the preparation method 200 of the optical fiber composite overhead ground wire of the present application welds a layer of aluminum tape on the periphery of the stainless steel tube optical unit. The material of the aluminum tape is the same as the material of the outer layer of the metal monofilament 20 to avoid electrochemical corrosion caused by direct contact between the stainless steel tube optical unit and the metal monofilament 20, thereby improving the service life of the optical fiber composite overhead ground wire 100. In addition, the aluminum tape is welded to the periphery of the stainless steel tube optical unit using a laser continuous welding process, which can avoid damage to the aluminum tape while ensuring the welding quality, further ensuring the service life of the optical fiber composite overhead ground wire 100. The aluminum-clad steel tube of the aluminum-clad steel tube optical unit 10 formed after welding is then subjected to a continuous drawing process to improve the performance of the aluminum layer 13 and reduce the interface bonding gap between the stainless steel tube 12 and the aluminum layer 13 to avoid damage during the subsequent twisting operation.

[0038] Please combine again Figures 2 to 4 In one embodiment, in step S1, when wrapping the aluminum ribbon around the outer periphery of the stainless steel tube light unit, the aluminum ribbon and the stainless steel tube light unit are simultaneously paid out via their respective pay-off wheels. This allows the aluminum ribbon to be inserted into the stainless steel tube light unit while the aluminum ribbon is being wrapped, thereby wrapping the aluminum ribbon around the outer periphery of the stainless steel tube light unit. The aluminum ribbon is specifically wrapped around the outer periphery of the stainless steel tube light unit in a continuous longitudinal manner, which improves the tightness of the connection between the two.

[0039] In this embodiment, the aluminum strip is made of 1060 electrically pure aluminum strip. The thickness of the aluminum strip is 0.1 mm to 0.35 mm. This prevents the increased thickness of the aluminum strip from increasing the outer diameter of the optical fiber composite overhead ground wire 100, which would violate the design requirements of the overhead line. Furthermore, an increased outer diameter of the optical fiber composite overhead ground wire 100 would increase its weight and manufacturing cost, further increasing line construction costs.

[0040] It is understandable that the thickness of the aluminum strip may be 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, etc.

[0041] In this way, the aluminum strip of smaller thickness is sequentially formed on the periphery of the stainless steel tube optical unit through a wrapping and laser continuous welding process, which can avoid electrochemical corrosion between the stainless steel tube optical unit and the metal monofilament 20 without significantly increasing the outer diameter of the optical fiber composite overhead ground wire 100. Compared with the continuous extrusion molding method of coating the outer peripheral surface of the stainless steel tube optical unit with aluminum, this processing method has a minimum thickness of the aluminum layer 13 formed by continuous extrusion molding of 1 mm. The thickness of the aluminum layer 13 formed is much higher than the thickness of the aluminum strip of the present application, which has a greater impact on the outer diameter of the optical fiber composite overhead ground wire 100. It can be seen that the thickness of the aluminum layer 13 processed by the present application is thin and more uniform, and at the same time meets the production of central aluminum-clad steel tube optical fiber composite overhead ground wires and layer-stranded aluminum-clad steel tube optical fiber composite overhead ground wires, expanding the manufacturing range of the process, and especially solving the problem of aluminum coating of small-diameter optical units of layer-stranded optical fiber composite overhead ground wires. In addition, the thin-walled aluminum-clad steel tube unit processed by the present application also has the advantages of hydrogen resistance and flow resistance.

[0042] In this embodiment, the tension of the aluminum strip is adjusted by the first tension adjustment device during the pay-off process so that the tension of the aluminum strip is within the range of 0.2kg to 0.8kg, thereby preventing the aluminum strip from being easily broken due to excessive tension and from being easily wrinkled due to excessive tension, thereby affecting longitudinal wrap welding.

[0043] It can be understood that the tension of the aluminum strip can be 0.2kg, 0.3kg, 0.4kg, 0.5kg, 0.6kg, 0.7kg, 0.8kg, etc.

[0044] In this embodiment, the outer diameter of the stainless steel tube light unit is 2.4 mm. During the pay-off process, the second tension adjustment device adjusts the tension of the stainless steel tube light unit to maintain the tension within the range of 2 kg to 8 kg. This prevents the stainless steel tube light unit from being easily broken due to excessive tension, or from being unable to adhere tightly to the aluminum strip due to insufficient tension.

[0045] It is understandable that the tension of the stainless steel tube light unit can be 2kg, 3kg, 4kg, 5kg, 6kg, 7kg, 8kg, etc.

[0046] Please combine again Figures 2 to 4 In one embodiment, after the tension of the aluminum strip is adjusted, the following steps are further performed in sequence: cleaning the aluminum strip; and slitting the aluminum strip.

[0047] In this embodiment, after tension adjustment, ultrasonic hot water is used to clean the aluminum strip's surface to remove oil stains, preventing missed welds, cold welds, or loose solder joints during laser welding. The hot water temperature during cleaning is no less than 60°C, and the ultrasonic power is no less than 2 kW. Furthermore, surface cleaning can increase the weld absorption rate by 10% to 15%, facilitating low-power laser welding.

[0048] It is understandable that, in other embodiments, the surface of the aluminum strip may also be cleaned by a mechanical grinding process.

[0049] In this embodiment, after the aluminum ribbon is cleaned, it is slit. Specifically, a high-precision mechanical cutter is used for precise slitting of the aluminum ribbon. The cut aluminum ribbon is guaranteed to be free of quality defects such as burrs, curling, and camber, and the parallelism of the two sides of the slit ribbon does not exceed 0.05 mm. The width of the aluminum ribbon is determined by the dimensions of the optical fiber 11 unit, but the excess material from slitting does not exceed 5% of the actual width of the aluminum ribbon.

[0050] Please combine again Figures 2 to 4 In one embodiment, the slit aluminum strip is drawn to a longitudinal wrapping device, and the tension-adjusted stainless steel tube light unit is simultaneously drawn to the device, allowing for continuous longitudinal wrapping of the aluminum strip. After the aluminum strip is wrapped around the outer surface of the stainless steel tube light unit, it is welded to the unit using a continuous laser welding process to ensure a secure connection between the two.

[0051] In this embodiment, the laser operates at a short wavelength, specifically 532 nm. The use of a 532 nm short-wavelength laser for continuous welding of aluminum strips is based on the fact that the aluminum strips in this embodiment are thin-walled, ranging in thickness from 0.1 mm to 0.35 mm. Taking into account the absorptivity, reflectivity, machining accuracy, and coating integrity requirements for thin-walled aluminum strips, the laser welding gun operates at a short wavelength of 532 nm. This differs from the 1064 nm wavelength used for stainless steel strip laser welding. Shorter wavelengths increase absorptivity, while longer wavelengths decrease absorptivity.

[0052] In this embodiment, since the thickness of the aluminum strip in this embodiment is 0.1mm to 0.35mm, the thickness of the aluminum strip is relatively thin and the melting point of aluminum is low, it is necessary to specially control the heat-affected zone of the weld. When performing the laser continuous welding process, the laser welding power is 800W to 950W, and the laser welding speed is 8m / min to 15m / min. If the laser welding power is too large or the welding speed is too slow, the thinner aluminum strip absorbs a large amount of welding heat, which easily causes steel-aluminum adhesion and aluminum strip welding holes. If the welding power is too small or the welding speed is too fast, the thinner aluminum strip absorbs insufficient welding energy, the welding molten pool depth is too shallow, resulting in incomplete welding of the aluminum strip, peeling and exposed steel in the subsequent drawing process, and also affecting the corrosion resistance of the optical fiber composite overhead ground wire 100.

[0053] It is understandable that the welding power of the laser can be 800W, 810W, 820W, 830W, 840W, 850W, 860W, 870W, 880W, 890W, 900W, 910W, 920W, 930W, 940W, 950W, etc.

[0054] The laser welding speed can be 8m / min, 9m / min, 10m / min, 11m / min, 12m / min, 13m / min, 14m / min, 15m / min, etc.

[0055] Furthermore, welding power and speed are also related to the thickness of the aluminum strip being welded. Thicker aluminum strips require higher welding heat capacity, so increasing the welding power and decreasing the welding speed can be helpful, and vice versa. To improve welding efficiency and control weld quality, the welding power and speed are dynamically adjusted to maintain the welding heat power within a range of 30J / mm to 100J / mm. Excessive laser welding power can easily lead to weld holes. Excessive power can result in weld failures.

[0056] It is understandable that the welding heat power of the aluminum strip can be 30 J / mm, 40 J / mm, 50 J / mm, 60 J / mm, 70 J / mm, 80 J / mm, 90 J / mm, 100 J / mm, etc.

[0057] In this way, the present application realizes the welding of thin-walled aluminum layer 13 by controlling parameters such as laser welding power, laser welding speed, and welding thermal power of aluminum strip, and ensures welding quality, making the manufacturing process more stable, solving the technical problem of the process being sensitive to environmental influences, and especially solving the problem of continuous welding of small diameter and long length tubes with diameters ranging from 1.2mm to 3.5mm. Compared with the argon arc welding process for aluminum strip welding, when the online argon arc welding process for aluminum strip is adopted, the arc is very easy to drift during the argon arc welding of aluminum strip, and the welding stability is very poor due to the influence of multiple factors such as tungsten needle burnout, tungsten needle angle change, tungsten needle and aluminum layer 13 distance change, and protective atmosphere fluctuation with the environment. Small diameter optical units with diameters ranging from 1.2mm to 3.5mm are even more prone to welding breakdown, and the continuous production of long length optical units cannot be guaranteed, which makes the argon arc welding process of aluminum strip limited by specifications and segment length.

[0058] Furthermore, the aluminum-clad steel tube of the aluminum-clad steel tube optical unit 10 formed after welding is subjected to a continuous drawing process to further improve the hardness of the aluminum layer 13 and reduce the steel-aluminum interface bonding gap, thereby preventing mechanical damage during the subsequent cable twisting of the optical fiber composite overhead ground wire 100.

[0059] In addition, the continuous drawing process of the aluminum-clad steel tube can further reduce the thickness of the aluminum layer 13 and the aluminum-clad steel tube, so that the final drawn aluminum-clad steel tube optical fiber 11 unit diameter is 1.2mm to 8.0mm, avoiding the outer diameter of the final formed optical fiber composite overhead ground wire 100 being too large.

[0060] It is understandable that the diameter of the drawn aluminum-clad steel tube optical fiber 11 unit can be 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4.0mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5.0mm, 5.1mm, 5.2mm, 5.3mm, 5.4mm, 5.5mm, 5.6mm, 5.7mm, 5.8mm, 5.9mm, 6.0mm, 6.1mm, 6.2mm, 6.3mm, 6.4mm, 6.5mm, 6.6mm, 6.7mm, 6.8mm, 6.9mm, 7.0mm, 7.1mm, 7.2mm, 7.3mm, 7.4mm, 7.5mm, 7.6mm, 7.7mm, 7.8mm, 7.9mm, 8.0mm, 8.1mm, 8.2mm, 8.3mm, 8.4mm, 8.5mm, 8.6mm, 8.7mm, 8.8mm, 8.9mm, 9.0mm, 9.1mm, 9.2mm, 4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5.0mm, 5.1mm, 5.2mm, 5.3mm, 5.4mm, 5.5mm, 5.6mm, 5.7mm, 5.8mm, 5.9mm, 6.0mm, 6.1mm, 6.2m m, 6.3mm, 6.4mm, 6.5mm, 6.6mm, 6.7mm, 6.8mm, 6.9mm, 7.0mm, 7.1mm, 7.2mm, 7.3mm, 7.4mm, 7.5mm, 7.6mm, 7.7mm, 7.8mm, 7.9mm, 8.0mm, etc.

[0061] Furthermore, after the aluminum-clad steel tube of the aluminum-clad steel tube optical unit 10 is subjected to a continuous drawing process, the aluminum-clad steel tube is subjected to online flaw detection, and the defective areas of the aluminum-clad steel tube are marked to facilitate subsequent repair of the defective areas, and the laser welding power and welding speed are dynamically adjusted based on the flaw detection results. The aluminum-clad steel tube is a structure formed by a stainless steel tube 12 and an aluminum layer 13 welded thereon. Eddy current flaw detection can be used for online flaw detection to detect the welding quality of the aluminum-clad steel tube in real time. If the detected aluminum-clad steel tube has problems such as steel-aluminum adhesion or welding holes, the laser welding power is reduced and / or the laser welding speed is increased. If the detected aluminum-clad steel tube has problems such as a shallow weld pool depth, the laser welding power is increased and / or the laser welding speed is reduced, thereby ensuring that the aluminum-clad steel tube formed by subsequent welding is not prone to quality problems.

[0062] After inspection, the aluminum-clad steel tube optical unit 10 is pulled by a crawler to its corresponding I-spool for winding. Subsequently, the aluminum-clad steel tube optical unit 10 is paid out using an active pay-off device. The paid-out aluminum-clad steel tube optical unit 10 is then pulled to the stranding equipment and coaxially stranded with the metal monofilament 20. The aluminum-clad steel tube optical unit 10 can be positioned in a layer stranding position or a central position.

[0063] Example 1 An aluminum strip with a thickness of 0.25 mm and a stainless steel tube optical unit with an outer diameter of 2.4 mm are provided. According to the above-mentioned preparation method 200 of the optical fiber composite overhead ground wire, an aluminum-clad steel tube optical unit 10 is first processed, and then the processed aluminum-clad steel tube optical unit 10 is twisted with the aluminum-clad steel wire to form the optical fiber composite overhead ground wire 100.

[0064] The aluminum strip cleaning process uses a hot water temperature of 70°C and an ultrasonic power of 2.5 kW. The aluminum strip is welded using a short-wave laser with a wavelength of 532 nm, a laser welding power of 850 W, a welding speed of 10 m / min, and a welding heat output of 50 J / mm. The aluminum strip is tensioned to 0.4 kg after tension adjustment, while the stainless steel tube optical unit is tensioned to 5 kg after tension adjustment.

[0065] The outer diameter of the processed aluminum-clad steel tube optical unit 10 is 3.0 mm, and the thickness of the aluminum layer 13 is 0.25 mm. Eddy current testing of the processed aluminum-clad steel tube optical unit 10 revealed no weld leaks. Furthermore, a 2000-hour neutral salt spray corrosion test of the processed fiber-optic composite overhead ground wire 100 revealed no rust spots.

[0066] Example 2 An aluminum strip with a thickness of 0.2 mm and a stainless steel tube optical unit with an outer diameter of 2.8 mm are provided. According to the above-mentioned preparation method 200 of the optical fiber composite overhead ground wire, an aluminum-clad steel tube optical unit 10 is first processed, and then the processed aluminum-clad steel tube optical unit 10 is twisted with the aluminum-clad steel wire to form the optical fiber composite overhead ground wire 100.

[0067] The aluminum strip cleaning process uses a hot water temperature of 70°C and an ultrasonic power of 2.5 kW. The aluminum strip is welded using a short-wave laser with a wavelength of 532 nm and a power of 920 W at a welding speed of 13 m / min. The welding heat output is 63 J / mm. The aluminum strip is tensioned to 0.4 kg after adjustment, while the stainless steel tube optical unit is tensioned to 5 kg.

[0068] The outer diameter of the processed aluminum-clad steel tube optical unit 10 is 3.25 mm, and the thickness of the aluminum layer 13 is 0.2 mm. Eddy current testing of the processed aluminum-clad steel tube optical unit 10 revealed no weld leaks. Furthermore, a 2000-hour neutral salt spray corrosion test of the processed fiber-optic composite overhead ground wire 100 revealed no rust spots.

[0069] Comparative Example 1 An aluminum strip with a thickness of 0.25 mm and a stainless steel tube optical unit with an outer diameter of 2.4 mm are provided. According to the above-mentioned preparation method 200 of the optical fiber composite overhead ground wire, an aluminum-clad steel tube optical unit 10 is first processed, and then the processed aluminum-clad steel tube optical unit 10 is twisted with the aluminum-clad steel wire to form the optical fiber composite overhead ground wire 100.

[0070] The aluminum strip cleaning process uses a hot water temperature of 70°C and an ultrasonic power of 2.5 kW. The aluminum strip is welded using a short-wave laser with a wavelength of 532 nm and a power of 760 W at a welding speed of 17 m / min. The welding heat output is 26.8 J / mm. The aluminum strip is tensioned to 0.4 kg after tension adjustment, while the stainless steel tube optical unit is tensioned to 5 kg after tension adjustment.

[0071] The outer diameter of the processed aluminum-clad steel tube optical unit 10 is 3 mm, and the thickness of the aluminum layer 13 is 0.25 mm. Eddy current testing of the processed aluminum-clad steel tube optical unit 10 revealed intermittent alarms, indicating that the aluminum layer on the sample end face was not fully welded. Furthermore, a neutral salt spray corrosion test of the processed fiber-optic composite overhead ground wire 100 revealed the appearance of dark red rust spots after 1036 hours.

[0072] Comparative Example 2 An aluminum strip with a thickness of 0.25 mm and a stainless steel tube optical unit with an outer diameter of 2.4 mm are provided. According to the above-mentioned preparation method 200 of the optical fiber composite overhead ground wire, an aluminum-clad steel tube optical unit 10 is first processed, and then the processed aluminum-clad steel tube optical unit 10 is twisted with the aluminum-clad steel wire to form the optical fiber composite overhead ground wire 100.

[0073] The aluminum strip cleaning process uses a hot water temperature of 70°C and an ultrasonic power of 2.5 kW. The aluminum strip is welded using a short-wave laser with a wavelength of 532 nm, a laser welding power of 986 W, a laser welding speed of 7.3 m / min, and a welding thermal power of 119.3 J / mm. The aluminum strip is tensioned to 0.4 kg after tension adjustment, while the stainless steel tube optical unit is tensioned to 5 kg after tension adjustment.

[0074] The processed aluminum-clad steel optical unit 10 has an outer diameter of 3 mm, and the thickness of the aluminum layer 13 is 0.25 mm. Eddy current testing of the processed aluminum-clad steel optical unit 10 revealed a continuous alarm, indicating steel-aluminum adhesion and the presence of ablation holes on the sample end face. Furthermore, a neutral salt spray corrosion test of the processed fiber-optic composite overhead ground wire 100 revealed the appearance of dark red rust spots after 58 hours.

[0075] Comparative Example 3 An aluminum strip with a thickness of 0.25 mm and a stainless steel tube optical unit with an outer diameter of 2.4 mm are provided. According to the above-mentioned preparation method 200 of the optical fiber composite overhead ground wire, an aluminum-clad steel tube optical unit 10 is first processed, and then the processed aluminum-clad steel tube optical unit 10 is twisted with the aluminum-clad steel wire to form the optical fiber composite overhead ground wire 100.

[0076] The aluminum strip cleaning process uses a hot water temperature of 70°C and an ultrasonic power of 2.5 kW. The aluminum strip is welded using a short-wave laser with a wavelength of 532 nm, a laser welding power of 850 W, a laser welding speed of 7.2 m / min, and a welding heat output of 69 J / mm. The aluminum strip is tensioned to 0.4 kg after adjustment, while the stainless steel tube optical unit is tensioned to 5 kg.

[0077] The processed aluminum-clad steel optical unit 10 has an outer diameter of 3.0 mm, and the thickness of the aluminum layer 13 is 0.25 mm. Eddy current testing of the processed aluminum-clad steel optical unit 10 revealed intermittent alarms, indicating the presence of small ablation holes on the sample end face at the alarm markers. Furthermore, neutral salt spray corrosion testing of the processed fiber-optic composite overhead ground wire 100 revealed the appearance of dark red rust spots after 522 hours.

[0078] Comparative Example 4 An aluminum strip with a thickness of 0.25 mm and a stainless steel tube optical unit with an outer diameter of 2.4 mm are provided. According to the above-mentioned preparation method 200 of the optical fiber composite overhead ground wire, an aluminum-clad steel tube optical unit 10 is first processed, and then the processed aluminum-clad steel tube optical unit 10 is twisted with the aluminum-clad steel wire to form the optical fiber composite overhead ground wire 100.

[0079] The aluminum strip cleaning process uses a hot water temperature of 70°C and an ultrasonic power of 2.5 kW. The aluminum strip is welded using a short-wave laser with a wavelength of 532 nm, a laser welding power of 850 W, a laser welding speed of 18.3 m / min, and a welding heat output of 32 J / mm. The aluminum strip is tensioned to 0.4 kg after adjustment, while the stainless steel tube optical unit is tensioned to 5 kg after adjustment.

[0080] The processed aluminum-clad steel tube optical unit 10 has an outer diameter of 3.0 mm, and the thickness of the aluminum layer 13 is 0.25 mm. Eddy current testing of the processed aluminum-clad steel tube optical unit 10 revealed intermittent alarms, indicating that the aluminum layer on the sample end face was not fully welded. Furthermore, a neutral salt spray corrosion test of the processed fiber-optic composite overhead ground wire 100 revealed the appearance of dark red rust spots after 1145 hours.

[0081] Comparative Example 5 An aluminum strip with a thickness of 0.25 mm and a stainless steel tube optical unit with an outer diameter of 2.4 mm are provided. According to the above-mentioned preparation method 200 of the optical fiber composite overhead ground wire, an aluminum-clad steel tube optical unit 10 is first processed, and then the processed aluminum-clad steel tube optical unit 10 is twisted with the aluminum-clad steel wire to form the optical fiber composite overhead ground wire 100.

[0082] The aluminum strip cleaning process uses a hot water temperature of 70°C and an ultrasonic power of 2.5 kW. The aluminum strip is welded using a short-wave laser with a wavelength of 532 nm and a power of 730 W at a welding speed of 10 m / min. The welding heat output is 35.6 J / mm. The aluminum strip is tensioned to 0.4 kg after adjustment, while the stainless steel tube optical unit is tensioned to 5 kg after adjustment.

[0083] The processed aluminum-clad steel tube optical unit 10 has an outer diameter of 3.0 mm, and the thickness of the aluminum layer 13 is 0.25 mm. Eddy current testing of the processed aluminum-clad steel tube optical unit 10 revealed intermittent alarms, indicating that the aluminum layer on the sample end face was not fully welded. Furthermore, a neutral salt spray corrosion test of the processed fiber-optic composite overhead ground wire 100 revealed the appearance of dark red rust spots after 950 hours.

[0084] Comparative Example 6 An aluminum strip with a thickness of 0.25 mm and a stainless steel tube optical unit with an outer diameter of 2.4 mm are provided. According to the above-mentioned preparation method 200 of the optical fiber composite overhead ground wire, an aluminum-clad steel tube optical unit 10 is first processed, and then the processed aluminum-clad steel tube optical unit 10 is twisted with the aluminum-clad steel wire to form the optical fiber composite overhead ground wire 100.

[0085] The aluminum strip cleaning process uses a hot water temperature of 70°C and an ultrasonic power of 2.5 kW. The aluminum strip is welded using a short-wave laser with a wavelength of 532 nm, a laser welding power of 1000 W, a welding speed of 10 m / min, and a thermal power of 87 J / mm. The aluminum strip is tensioned to 0.4 kg after adjustment, while the stainless steel tube optical unit is tensioned to 5 kg.

[0086] The processed aluminum-clad steel optical unit 10 has an outer diameter of 3.0 mm, and the thickness of the aluminum layer 13 is 0.25 mm. Eddy current testing of the processed aluminum-clad steel optical unit 10 revealed intermittent alarms, with minor ablation of the aluminum layer on the sample end face at the alarm marker. Furthermore, neutral salt spray corrosion testing of the processed fiber-optic composite overhead ground wire 100 revealed the appearance of dark red rust spots after 470 hours.

[0087] Comparative Example 7 An aluminum strip with a thickness of 0.25 mm and a stainless steel tube optical unit with an outer diameter of 2.4 mm are provided. According to the above-mentioned preparation method 200 of the optical fiber composite overhead ground wire, an aluminum-clad steel tube optical unit 10 is first processed, and then the processed aluminum-clad steel tube optical unit 10 is twisted with the aluminum-clad steel wire to form the optical fiber composite overhead ground wire 100.

[0088] The aluminum strip cleaning process uses a hot water temperature of 55°C and an ultrasonic power of 1.8 kW. The aluminum strip is welded using a short-wave laser with a wavelength of 532 nm, a laser welding power of 850 W, a laser welding speed of 10 m / min, and a welding heat output of 50 J / mm. The aluminum strip is tensioned to 0.4 kg after tension adjustment, while the stainless steel tube optical unit is tensioned to 5 kg after tension adjustment.

[0089] The outer diameter of the processed aluminum-clad steel tube optical unit 10 is 3.0 mm, and the thickness of the aluminum layer 13 is 0.25 mm. Eddy current testing of the processed aluminum-clad steel tube optical unit 10 revealed intermittent alarms, indicating bulges in the aluminum layer of the sample. Furthermore, neutral salt spray corrosion testing of the processed fiber-optic composite overhead ground wire 100 revealed the appearance of dark red rust spots after 1380 hours.

[0090] The specific embodiments of the present application have been described above with reference to the accompanying drawings. However, those skilled in the art will appreciate that various modifications and substitutions may be made to the specific embodiments of the present application without departing from the scope of the present application. Such modifications and substitutions are within the scope of the present application.

Claims

1. A method for preparing an optical fiber composite overhead ground wire, characterized in that: The steps include: Providing an aluminum strip, and wrapping the aluminum strip around the outer circumference of the stainless steel tube light unit; The aluminum strip and the stainless steel tube light unit are welded by a laser continuous welding process to form an aluminum-clad steel tube light unit; Performing a continuous drawing process on the aluminum-clad steel tube of the aluminum-clad steel tube optical unit; The drawn aluminum-clad steel tube light unit is twisted with a metal monofilament, and the outer layer of the metal monofilament is made of the same material as the aluminum layer of the aluminum-clad steel tube light unit.

2. The method for preparing an optical fiber composite overhead ground wire according to claim 1, wherein: The laser welding power is 800W to 950W, the laser welding speed is 8m / min to 15m / min, the laser working wavelength is short wave, and the welding heat power of the aluminum strip is 30J / mm to 100J / mm.

3. The method for preparing an optical fiber composite overhead ground wire according to claim 2, wherein: The operating wavelength of the laser is 532 nm.

4. The method for preparing an optical fiber composite overhead ground wire according to claim 1, wherein: After the aluminum-clad steel tube of the aluminum-clad steel tube optical unit is subjected to a continuous drawing process, the aluminum-clad steel tube is subjected to online flaw detection, and the welding power and welding speed of the laser are dynamically adjusted based on the flaw detection results.

5. The method for preparing an optical fiber composite overhead ground wire according to claim 1, wherein: The thickness of the aluminum strip is 0.1 mm to 0.35 mm. After the aluminum-clad steel tube of the aluminum-clad steel tube optical unit is subjected to a continuous drawing process, the diameter of the aluminum-clad steel tube optical unit is 1.2 mm to 8 mm.

6. The method for preparing an optical fiber composite overhead ground wire according to claim 1, wherein: The aluminum strip is wrapped around the outer periphery of the stainless steel tube light unit after being paid out, and the tension of the aluminum strip is adjusted by a first tension adjustment device during the pay-out process so that the tension of the aluminum strip is within the range of 0.2 kg to 0.8 kg.

7. The method for preparing an optical fiber composite overhead ground wire according to claim 6, wherein: After the tension of the aluminum strip is adjusted, the method further comprises the following steps: Performing a cleaning operation on the aluminum strip; The aluminum strip is cut into pieces.

8. The method for preparing an optical fiber composite overhead ground wire according to claim 1, wherein: The stainless steel tube light unit is wrapped by the aluminum tape after being paid out, and the tension of the stainless steel tube light unit is adjusted by the second tension adjustment device during the pay-out process so that the tension of the stainless steel tube light unit is within the range of 2kg to 8kg.

9. An optical fiber composite overhead ground wire, characterized in that: The optical fiber composite overhead ground wire is prepared by the preparation method of any one of claims 1 to 8, wherein the optical fiber composite overhead ground wire comprises an aluminum-clad steel tube optical unit and a plurality of metal monofilaments, wherein the plurality of metal monofilaments are arranged around the outer periphery of the aluminum-clad steel tube optical unit, and the material of the outer layer of the metal monofilament is the same as the material of the aluminum layer of the aluminum-clad steel tube optical unit.

10. The optical fiber composite overhead ground wire according to claim 9, wherein: The metal monofilament is aluminum-clad steel wire, aluminum wire or aluminum alloy wire.

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