Aluminum wire conductor stranded wire pitch ratio control process and aluminum stranded wire

Abstract

The application relates to the technical field of cable manufacturing, and particularly discloses an aluminum wire conductor stranded wire pitch-diameter ratio control process and an aluminum stranded wire, which comprises the following steps: setting a target pitch-diameter ratio of each layer of stranded wire; obtaining an actual diameter of each layer of stranded wire during stranding; obtaining a basic pitch according to the product of the target pitch-diameter ratio and the actual diameter of each layer of stranded wire; compensating the basic pitch according to obtained temperature data and tension data of each layer of stranded wire to obtain a target pitch; and controlling the rotating speed of each layer of stranded wire during stranding according to the target pitch. On the premise that the diameter of each layer of stranded wire is stably controlled, the pitch of each layer of stranded wire can be dynamically corrected according to the temperature and the tension of each layer of stranded wire, the control precision of the pitch-diameter ratio is improved, the pitch-diameter ratio error of the obtained aluminum stranded wire does not exceed a set pitch-diameter ratio threshold value, the stress distribution uniformity of the aluminum stranded wire is significantly improved, and the fatigue life is improved.

Description

Technical Field

[0001] This invention relates to the field of cable manufacturing technology, and more specifically, to a process for controlling the pitch ratio of aluminum wire conductor strands and aluminum strands. Background Technology

[0002] In the cable industry, high-voltage transmission conductors are generally made of steel-cored aluminum stranded wire, with the core made of steel stranded wire and the outer layer made of aluminum stranded wire.

[0003] The pitch ratio is a core parameter in the stranded wire manufacturing process. It is defined as the ratio of the axial length of the complete helix formed by any single wire in the stranded wire (i.e., the pitch) to the outer diameter of the stranded wire. This parameter directly affects the mechanical properties, electrical conductivity, and material consumption of the stranded wire. In the traditional stranded wire manufacturing process, conventional aluminum stranded wire is stranded in layers. The control precision of the pitch ratio is insufficient, resulting in large fluctuations in the pitch ratio. This leads to uneven stress distribution in various parts of the aluminum stranded wire, which reduces fatigue life.

[0004] Therefore, it is necessary to propose a process for controlling the pitch ratio of aluminum wire conductor strands and aluminum strands to at least partially solve the problems existing in the prior art. Summary of the Invention

[0005] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. The summary section of this invention is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0006] To at least partially solve the above problems, the present invention provides a process for controlling the pitch ratio of aluminum wire conductor strands, comprising: Set the target pitch ratio for each layer of stranded wire. During stranding, obtain the actual diameter of each layer of stranded wire. Based on the product of the target pitch ratio and the actual diameter of each layer of stranded wire, obtain the basic pitch. Based on the acquired temperature data and tension data of each strand, the base pitch is compensated to obtain the target pitch; The rotational speed of each strand during stranding is controlled according to the target pitch.

[0007] Preferably, obtaining the target pitch includes: Calculate the reference pitch of each strand and the acquired temperature data to obtain the first pitch compensation amount; where the reference pitch is the pitch of each strand at the reference temperature; Calculate the current pitch of each strand and the acquired tension data to obtain the second pitch compensation amount; The base pitch is compensated based on the first pitch compensation amount and the second pitch compensation amount to obtain the target pitch.

[0008] Preferably, obtaining the first pitch compensation amount includes: The temperature change value is obtained based on the current temperature and reference temperature during stranding; The first pitch compensation amount is obtained by multiplying the thermal expansion coefficient of each strand material, the temperature change value, and the reference pitch.

[0009] Preferably, obtaining the second pitch compensation amount includes: Based on the tension data of each layer of strands, the tension difference between two adjacent layers of strands is obtained; Determine whether the tension difference is less than or equal to the set threshold. If yes, the value of the second pitch compensation is zero. If no, obtain the tension compensation coefficient based on the tension difference and the reference tension value of each layer of strand. The second pitch compensation amount is obtained by multiplying the material deformation coefficient, tension compensation coefficient and current pitch of each strand; The tension data for each layer of stranded wire is: the tension value of each strand's individual filament.

[0010] Preferably, the tension data for each strand is obtained using one or a combination of the following methods: The first method involves obtaining the radial pressure borne by the guide wheel used to transport each layer of strands, and then obtaining the tension value of the single filament based on the radial pressure. The second method involves obtaining the vibration frequency of each strand of the twisted wire and then using that frequency to determine the tension value of the strand.

[0011] Preferably, when the tension data of each strand is obtained using a combination of multiple methods, the weighted average of the tension values ​​of the single filaments obtained under the multiple methods is calculated as the tension data of each strand.

[0012] Preferably, the rotational speed during stranding of each layer of strands is controlled according to the target pitch, including: The target rotational speed for each layer of stranded wire is obtained based on the ratio of the take-up speed to the target pitch of each layer of stranded wire. The speed adjustment amount is obtained based on the difference between the target speed and the current speed; The rotational speed during the stranding of each layer of strands is controlled based on the rotational speed adjustment.

[0013] Preferably, the rotational speed of the winding cage corresponding to each layer of strands is controlled by a separate drive device.

[0014] Preferably, the two adjacent layers are two adjacent aluminum wire layers, or an adjacent aluminum wire layer and a steel core wire layer.

[0015] The present invention also provides an aluminum stranded wire, which is manufactured using the aluminum wire conductor stranded wire pitch ratio control process described in the present invention, comprising: a single steel core, a steel core wire layer, an inner aluminum wire layer, and an outer aluminum wire layer arranged sequentially from the inside to the outside.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects: The aluminum wire conductor stranded wire pitch ratio control process and aluminum stranded wire described in this invention, under the premise of stable control of the diameter of each layer of stranded wire, can dynamically correct the pitch of each layer of stranded wire according to the temperature and tension of each layer of stranded wire, improve the control accuracy of the pitch ratio, so that the pitch ratio error of each layer of the obtained aluminum stranded wire does not exceed the set pitch ratio threshold, significantly improve the stress distribution uniformity of the aluminum stranded wire, and improve fatigue life.

[0017] The aluminum wire conductor stranded wire pitch ratio control process and aluminum stranded wire described in this invention, as well as other advantages, objectives and features of this invention, will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a flowchart of the aluminum wire conductor stranded wire pitch ratio control process described in this invention; Figure 2 This is a flowchart of step S2 in the aluminum wire conductor strand diameter ratio control process described in this invention. Figure 3 This is a flowchart of step S3 in the aluminum wire conductor strand diameter ratio control process described in this invention. Figure 4 This is a schematic cross-sectional view of the aluminum stranded wire described in this invention.

[0019] In the attached diagram, 1 represents a single steel core, 2 represents a steel core wire layer, 3 represents an inner aluminum wire layer, and 4 represents an outer aluminum wire layer. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments, so that those skilled in the art can implement it based on the description.

[0021] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0022] like Figure 1 As shown, the present invention provides a process for controlling the pitch ratio of aluminum wire conductor strands, including: S1. Set the target pitch ratio for each layer of stranded wire. During stranding, obtain the actual diameter of each layer of stranded wire. Based on the product of the target pitch ratio and the actual diameter of each layer of stranded wire, obtain the basic pitch. like Figure 4 As shown, specifically, for example, one type of aluminum stranded wire includes, from the inside out, a single steel core 1, a steel core layer 2 formed by stranding 6 steel core monofilaments, an inner aluminum wire layer 3 formed by stranding 9 aluminum monofilaments, and an outer aluminum wire layer 4 formed by stranding 15 aluminum monofilaments; the target pitch ratio of each stranded wire layer is preset, the target pitch ratio of the steel core layer 2 is 16~26 (for 6 stranded layers) or 14~22 (for 12 stranded layers), the target pitch ratio of the inner aluminum wire layer 3 is 10~16, and the target pitch ratio of the outer aluminum wire layer 4 is 10~14; wherein, the target pitch ratio of the outer aluminum wire layer 4 is preferably 11±0.5, and the target pitch ratio of the inner aluminum wire layer 3 is preferably 12.5±0.5; It should be noted that during the stranding process, the tension of the single filament in each layer of stranded wire needs to be controlled in real time to ensure that each layer of stranded wire is not too loose or too tight, thereby controlling the diameter of each layer of stranded wire. This is existing technology and will not be elaborated further. However, this invention is based on the premise that the diameter of each layer of stranded wire is basically stably controlled, and precisely controls the pitch of each layer of stranded wire to improve the control accuracy of the pitch ratio. The standard for achieving basic stable control of the diameter of each layer of stranded wire is that the diameter of each layer of stranded wire is controlled within the diameter deviation range. For example, when the aluminum wire monofilament is made of hard aluminum round wire, the diameter deviation is ±0.03mm when the diameter d≤3mm and the diameter deviation is ±1%d when the diameter d>3mm. The diameter deviation of the aluminum wire monofilament shall be implemented in accordance with the national standard GB / T17048-2017 (hard aluminum wire for overhead stranded wire). For example, when the diameter of the steel core monofilament is 1.24mm < D ≤ 2.25mm, the diameter deviation is ±0.03mm; the diameter deviation of the steel core monofilament shall be implemented in accordance with the national standard GB / T 3428-2024 (galvanized steel wire for overhead conductors); Before stranding, the required rotation speed for each layer of stranded wire is preset. During stranding, the actual diameter of each layer of stranded wire can be detected by laser (or by using a surface quality visual monitoring device). The basic pitch can then be obtained based on the product of the target pitch ratio and the actual diameter. The surface quality visual monitoring device can take pictures of the stranded wire with three 120-degree cameras to fully capture the surface of the stranded wire, measure the actual diameter of the stranded wire online, and calculate the basic pitch of the stranded wire online. The basic pitch is a range or a value obtained by multiplying the target pitch ratio and the actual diameter. For example, if the target pitch ratio of the outer aluminum wire layer 4 is set to 10~12 (or 11±0.5) and the actual diameter of the outer aluminum wire layer 4 is 3mm, then the basic pitch is 30mm~36mm (or 33±0.5 mm).

[0023] S2. Based on the acquired temperature data and tension data of each strand, the base pitch is compensated to obtain the target pitch; Specifically, during the stranding process, the main factors affecting the pitch ratio are the stranding speed, the tension of each layer of stranded wire, and the temperature change of the single filament. Fluctuations in the stranding speed will cause changes in the pitch, the tension of the single filament in each layer of stranded wire and the tension difference between layers will affect the tightness of the stranded wire, and temperature changes will cause changes in the size of the stranded wire. Therefore, during stranding, it is necessary to compensate for the basic pitch based on the current temperature of the single filament and the tension of each layer of stranded wire in order to obtain an accurate target pitch. S3. Control the rotation speed of each layer of stranded wire during stranding according to the target pitch; Specifically, based on the relationship between the rotational speed and pitch during the stranding of each layer of strands, the target pitch can be used to control the rotational speed during the stranding of each layer of strands, thereby improving the control accuracy of the pitch.

[0024] Furthermore, the rotation speed of each stranded wire cage is controlled by a separate drive device, thereby enabling individual control of the rotation speed of each stranded wire.

[0025] Through the above process, under the premise that the diameter of each strand is stably controlled, the pitch of each strand can be dynamically corrected according to the temperature and tension of each strand, thereby improving the control accuracy of the pitch ratio. This ensures that the pitch ratio error of each layer of the obtained aluminum strand does not exceed the set pitch ratio threshold, which can be set to ±0.5. For example, in the above process, the pitch ratio error of the aluminum layer can be improved from ±2 to ±0.2, which significantly improves the stress distribution uniformity of the aluminum strand and enhances fatigue life.

[0026] like Figure 2 As shown, in one embodiment, obtaining the target pitch includes: S21. Calculate the reference pitch of each strand and the acquired temperature data to obtain the first pitch compensation amount; wherein, the reference pitch is the pitch of each strand at the reference temperature; Specifically, the reference temperature is generally 20℃, and the reference pitch is the pitch of each strand of wire obtained in advance at 20℃. During actual stranding, the temperature data of the current single filament is obtained. The pitch of the strand at the current temperature will be different from that at the reference temperature. Therefore, the first pitch compensation amount is obtained by using the reference pitch and the obtained temperature data to achieve temperature compensation for the pitch of each strand of wire. S22. Calculate the current pitch of each strand and the obtained tension data to obtain the second pitch compensation amount; Among them, the tension data for each layer of strands is the tension value of a single filament in each layer of strands; Specifically, during stranding, the current pitch of each strand can be obtained using any of the existing automatic pitch detection methods. Each strand of the stranded wire has a corresponding reference tension value, which can be selected within a set range. As described in step S1, the tension of each strand of the stranded wire needs to be controlled in real time, that is, the tension of the strand is controlled within the set range to ensure that the diameter of each strand of the stranded wire is basically stably controlled. In the actual stranding process, the tension difference between adjacent layers also affects the pitch. Since the tension value of each strand of the stranded wire is controlled within a set range, even if the reference tension values ​​of adjacent layers are the same (for example, the reference tension values ​​of the inner aluminum wire layer 3 and the outer aluminum wire layer 4 of the aluminum stranded wire are the same), a tension difference will still occur between adjacent layers in the actual stranding process. Therefore, based on the tension value of each strand of the stranded wire, the tension difference between adjacent stranded wires can also be obtained. The second pitch compensation amount is obtained through the current pitch of each stranded wire, the tension value of each strand of the stranded wire, and the tension difference between adjacent layers to achieve tension compensation for the pitch of each stranded wire. In multi-layer stranding (for example, the inner aluminum wire layer 3 and the outer aluminum wire layer 4 are stranded at the same time), it can compensate for the deviation of the pitch ratio caused by tension transmission. S23. Compensate the base pitch based on the first pitch compensation amount and the second pitch compensation amount to obtain the target pitch; Specifically, the first pitch compensation amount, which is related to temperature, and the second pitch compensation amount, which is related to tension, are superimposed on the base pitch to obtain the target pitch.

[0027] Further, in step S21, obtaining the first pitch compensation amount includes: The temperature change value is obtained based on the current temperature and reference temperature during stranding; The first pitch compensation amount is obtained by multiplying the thermal expansion coefficient of each strand material, the temperature change value, and the reference pitch.

[0028] The current temperature is the temperature of the monofilament acquired in real time, and the reference temperature is 20℃. The temperature change value is the difference between the current temperature and the reference temperature. The coefficient of thermal expansion of each layer of stranded wire material, for example, the inner aluminum wire layer 3 and the outer aluminum wire layer 4 are both formed by stranding aluminum single wires, and the coefficient of thermal expansion of aluminum is 23 × 10⁻⁶. -6 / ℃, the first pitch compensation is obtained by multiplying the thermal expansion coefficient of aluminum, the temperature change value, and the reference pitch.

[0029] Further, in step S22, obtaining the second pitch compensation amount includes: Based on the tension data of each layer of strands, the tension difference between two adjacent layers of strands is obtained; Determine whether the tension difference is less than or equal to the set threshold. If yes, the value of the second pitch compensation is zero. If no, obtain the tension compensation coefficient based on the tension difference and the reference tension value of each layer of strand. The second pitch compensation amount is obtained by multiplying the material deformation coefficient, tension compensation coefficient and current pitch of each strand.

[0030] The material deformation coefficient refers to Poisson's ratio, which is 0.33 for aluminum and 0.28 for steel.

[0031] Specifically, the threshold value for setting the tension difference can be determined based on the set deviation range corresponding to the deviation between the actual tension value of the stranded wires in adjacent layers and the reference tension value. For example, if the set deviation range corresponding to the deviation between the inner aluminum wire layer 3 and the outer aluminum wire layer 4 is -10N to 10N, then the threshold value for setting the tension difference is set to 10N. The tension difference is the absolute value of the tension difference between the stranded wires in two adjacent layers. Under the premise of controlling the deviation between the actual tension value of the aluminum wire monofilament and the reference tension value within the set deviation range, the tension difference between the monofilament tension of the inner aluminum wire layer 3 and the monofilament tension of the outer aluminum wire layer 4 is obtained in real time. If the tension difference is less than or equal to the set threshold, for example, 8N, no tension compensation is required. If the tension difference is greater than the set threshold, for example, 15N, tension compensation is required. The tension compensation coefficient is obtained by the ratio of the tension difference to the reference tension value of each strand. Then determine the stranded layer that needs to be adjusted in the two adjacent layers. For the stranded layer that needs to be adjusted, calculate the second pitch compensation amount by multiplying its material deformation coefficient, tension compensation coefficient and the current pitch. The method for determining which stranded layers need adjustment is to compare the deviation of the actual tension value of each stranded layer from the reference tension value, and determine the stranded layer with the larger deviation as the stranded layer that needs adjustment. If the deviation of the actual tension value of adjacent stranded layers from the reference tension value is the same, then both stranded layers need to be adjusted.

[0032] Furthermore, in step S22, the acquisition of tension data for each layer of strands includes any one or a combination of the following methods: The first method involves obtaining the radial pressure borne by the guide wheel used to transport each layer of strands, and then obtaining the tension value of the single filament based on the radial pressure. In the first method, each strand of the twisted wire requires a guide wheel for guidance. Based on the relationship between the radial pressure exerted by the stranded wire on the guide wheel and the tension value of the strand, the tension value of the strand can be indirectly obtained. Tension value of monofilament The relationship is: ,in, It is a sine trigonometric function. The wrap angle formed by the monofilament and the guide wheel. Obtained through detection. The value is fixed, so the tension value of the monofilament can be calculated; or any calculation method in the existing technology can be used, which will not be listed here. The second method involves obtaining the vibration frequency of the individual filaments in each layer of twisted wire, and then using the vibration frequency to determine the tension value of the individual filaments. In the second method, the vibration frequency of the monofilament is measured at a position before it is twisted using a detection device (such as a laser Doppler). The tension value of the monofilament is then calculated from the vibration frequency. ; The specific calculation formula can be: ,in, This is the length of the measurement area for a single filament, and is a fixed value, for example, 0.5 meters. The vibration frequency of a single filament is measured by the testing equipment. The linear density of a single filament. The bending stiffness of a single filament and the elastic modulus of the material. (Aluminum is taken as 70 GPa) and moment of inertia of section Related, It is a mathematical constant; or, any existing method for calculating the tension value of a single filament by calculating the vibration frequency can be used, which will not be listed here.

[0033] Tension data for each strand can be obtained using either the first method or the second method alone, or by combining the first and second methods.

[0034] In one embodiment, when the tension data of each strand is obtained using a combination of multiple methods, the weighted average of the tension values ​​of the individual filaments obtained under the multiple methods is calculated as the tension data of each strand.

[0035] Specifically, when each layer of stranded wire uses a combination of the first and second methods, the tension value of the single filament is obtained under each method. Then, weights are assigned to the tension values ​​obtained under each method. For example, the weight of the tension value obtained under the first method is 0.7, and the weight of the tension value obtained under the second method is 0.3. The sum of the product of the tension value obtained under the first method and 0.7 and the product of the tension value obtained under the second method and 0.3 is the tension data of each layer of stranded wire, thereby improving the accuracy of tension measurement.

[0036] like Figure 3 As shown, in step S3, the rotational speed of each strand during stranding is controlled according to the target pitch, including: S31. Based on the ratio of the take-up speed to the target pitch of each layer of stranded wire, obtain the target rotational speed during stranding of each layer of stranded wire. The take-up speed is the linear speed at which the traction device pulls the aluminum stranded wire, which is generally a fixed value (0 m / min ~ 40 m / min). The target pitch is obtained through step S2, and the ratio of the take-up speed to the target pitch is the target rotational speed. S32. Obtain the speed adjustment amount based on the difference between the target speed and the current speed; The current rotation speed is the current rotational speed of each layer of stranded wire; S33. Control the rotation speed during stranding of each layer of stranded wire according to the rotation speed adjustment amount.

[0037] Based on the speed adjustment, the required speed value to be increased or decreased can be obtained, thereby achieving speed control during stranding of each layer of strands, and thus adjusting the pitch of each layer of strands.

[0038] The same rotation speed is used when stranding the same layer of wire, while different rotation speeds are used when stranding different layers of wire.

[0039] In one embodiment, the two adjacent layers are two adjacent aluminum wire layers, or an adjacent aluminum wire layer and a steel core wire layer 2.

[0040] Among them, the two adjacent aluminum wire layers refer to the inner aluminum wire layer 3 and the outer aluminum wire layer 4 of the aluminum stranded wire; the adjacent aluminum wire layer and steel core wire layer 2 refer to the inner aluminum wire layer 3 and the steel core wire layer 2 of the aluminum stranded wire.

[0041] like Figure 4 As shown, the present invention also provides an aluminum stranded wire, which is manufactured using the aluminum wire conductor stranded wire pitch ratio control process described in the present invention, comprising: a single steel core 1, a steel core wire layer 2, an inner aluminum wire layer 3, and an outer aluminum wire layer 4 arranged sequentially from the inside to the outside. During manufacturing, the target pitch ratio of each stranded wire is preset. For example, the target pitch ratio of the steel core wire layer 2 is 16~26 (6 stranded layers) or 14~22 (12 stranded layers), the target pitch ratio of the inner aluminum wire layer 3 is 10~16, and the target pitch ratio of the outer aluminum wire layer 4 is 10~14. The aluminum wire conductor stranded wire pitch ratio control process described in this invention is used to ensure the control accuracy of the pitch ratio of each stranded wire, improve the stress distribution uniformity of the aluminum stranded wire, and thus improve the fatigue life.

[0042] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. Other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A process for controlling the pitch ratio of aluminum wire conductor strands, characterized in that, include: Set the target pitch ratio for each layer of stranded wire. During stranding, obtain the actual diameter of each layer of stranded wire. Based on the product of the target pitch ratio and the actual diameter of each layer of stranded wire, obtain the basic pitch. Based on the acquired temperature data and tension data of each strand, the base pitch is compensated to obtain the target pitch; The rotational speed of each strand during stranding is controlled according to the target pitch.

2. The aluminum wire conductor stranded wire pitch ratio control process according to claim 1, characterized in that, Obtaining the target pitch includes: Calculate the reference pitch of each strand and the acquired temperature data to obtain the first pitch compensation amount; where the reference pitch is the pitch of each strand at the reference temperature; Calculate the current pitch of each strand and the acquired tension data to obtain the second pitch compensation amount; The base pitch is compensated based on the first pitch compensation amount and the second pitch compensation amount to obtain the target pitch.

3. The aluminum wire conductor stranded wire pitch ratio control process according to claim 2, characterized in that, The first pitch compensation amount is obtained by: The temperature change value is obtained based on the current temperature and reference temperature during stranding; The first pitch compensation amount is obtained by multiplying the thermal expansion coefficient of each strand material, the temperature change value, and the reference pitch.

4. The aluminum wire conductor stranded wire pitch ratio control process according to claim 2, characterized in that, The second pitch compensation amount is obtained by: Based on the tension data of each layer of strands, the tension difference between two adjacent layers of strands is obtained; Determine whether the tension difference is less than or equal to the set threshold. If yes, the value of the second pitch compensation is zero. If no, obtain the tension compensation coefficient based on the tension difference and the reference tension value of each layer of strand. The second pitch compensation amount is obtained by multiplying the material deformation coefficient, tension compensation coefficient and current pitch of each strand; The tension data for each layer of stranded wire is: the tension value of each strand's individual filament.

5. The aluminum wire conductor stranded wire pitch ratio control process according to claim 4, characterized in that, The tension data for each strand of wire can be obtained using any one or a combination of the following methods: The first method involves obtaining the radial pressure borne by the guide wheel used to transport each layer of strands, and then obtaining the tension value of the single filament based on the radial pressure. The second method involves obtaining the vibration frequency of each strand of the twisted wire and then using that frequency to determine the tension value of the strand.

6. The aluminum wire conductor stranded wire pitch ratio control process according to claim 5, characterized in that, When the tension data of each strand is obtained using a combination of multiple methods, the weighted average of the tension values ​​of the individual filaments obtained under the multiple methods is calculated as the tension data of each strand.

7. The aluminum wire conductor stranded wire pitch ratio control process according to claim 1, characterized in that, The rotational speed during stranding of each layer of strands is controlled according to the target pitch, including: The target rotational speed for each layer of stranded wire is obtained based on the ratio of the take-up speed to the target pitch of each layer of stranded wire. The speed adjustment amount is obtained based on the difference between the target speed and the current speed; The rotational speed during the stranding of each layer of strands is controlled based on the rotational speed adjustment.

8. The aluminum wire conductor stranded wire pitch ratio control process according to claim 1, characterized in that, Each layer of stranded wire has its own winding cage, and the rotation speed is controlled by a separate drive device.

9. The aluminum wire conductor stranded wire pitch ratio control process according to claim 4, characterized in that, Two adjacent layers are either two adjacent aluminum wire layers, or an adjacent aluminum wire layer and a steel core wire layer.

10. An aluminum stranded wire, manufactured using the aluminum wire conductor stranded wire pitch ratio control process according to any one of claims 1-9, characterized in that, include: The structure consists of a single steel core, a steel core wire layer, an inner aluminum wire layer, and an outer aluminum wire layer, arranged sequentially from the inside out.

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