High-roundness and high-flexibility cable conductor manufacturing process, cable conductor and cable

Abstract

The invention discloses a high-roundness and high-flexibility cable conductor manufacturing process, a cable conductor and a cable. The technology comprises the steps that a copper rod is stretched through a large drawing machine; the copper wire is subjected to stretching treatment through an intermediate wire drawing machine, and continuous annealing treatment is directly conducted on an outlet wire of the intermediate wire drawing machine through an annealing machine; carrying out stretching treatment on the copper wire through a small drawing machine; the copper wire is heated, dried and subjected to heat preservation treatment through the tubular annealing furnace, and then the copper wire is subjected to oxidation resistance and impurity precipitation treatment through the circulating cooling water tank; and the tension deviation is controlled in the stranding process. Based on the process, the defects of insufficient roundness and softness of the cable conductor can be effectively improved.

Description

Technical Field

[0001] This invention relates to the field of wire and cable manufacturing technology, and in particular to a manufacturing process for a cable conductor with high roundness and high flexibility, as well as the cable conductor and the cable. Background Technology

[0002] Cables typically consist of a conductor, insulation layer, shielding layer, and sheath layer. The insulation layer covers the conductor to provide insulation. The outermost layer is the sheath layer, which protects the inner layers from external factors. The cable conductor transmits electrical energy or signals. Current cable conductor manufacturing processes include rough drawing, medium drawing, fine drawing, annealing, and stranding. However, the resulting stranded cable conductors generally suffer from insufficient roundness and flexibility, making them unsuitable for applications such as high-speed elevators.

[0003] Therefore, how to implement a manufacturing process for cable conductors that improves their roundness and flexibility has become a pressing technical challenge in this field. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention aims to provide a manufacturing process for a cable conductor with high roundness and high flexibility, as well as a cable conductor and a cable.

[0005] The high roundness and high flexibility cable conductor manufacturing process of the present invention is achieved by the following technical solution: A manufacturing process for a cable conductor with high roundness and high flexibility includes the following steps: S1, Copper Large Drawing Step: The copper rod is stretched using a large drawing machine to obtain a copper wire with a diameter of the first target value; S2, Copper intermediate drawing continuous annealing step: The copper wire obtained in step S1 is stretched by an intermediate drawing machine to reduce the diameter of the copper wire to the second target value, and the wire output from the intermediate drawing machine is continuously annealed by an annealing machine. S3, Copper wire drawing step; The copper wire obtained in step S2 is drawn using a small drawing machine to reduce the diameter of the copper wire to the third target value; S4, Tubular annealing step: The output wire of the small drawing machine is heated, dried and kept warm in a tubular annealing furnace. Then the output wire of the tubular annealing furnace is introduced into a circulating cooling water tank with added antioxidants for impurity precipitation treatment. S5. Stranding step: Strand multiple copper wires prepared in steps S1 to S4 into a cable conductor.

[0006] Furthermore, in step S1, the diameter of the copper rod is 8.0 mm, and the first target value is 2.0~3.0 mm.

[0007] Furthermore, in step S2, the second target value is 0.8~1.2mm.

[0008] Furthermore, in step S2, the annealing machine includes a preheating zone, an annealing zone, and a drying zone. The preheating zone, annealing zone, and drying zone are arranged in a triangular configuration, so that the copper wire travels in an S-shaped path when passing through the annealing machine. The S-shaped path includes two path turns, and the angle of each path turn is 60 degrees.

[0009] Furthermore, the temperature of the preheating zone is controlled at 300~350℃, the temperature of the annealing zone is controlled at 500~550℃, and the temperature of the drying zone is controlled at 150~200℃.

[0010] Furthermore, in step S3, the third target value is 0.05~0.5mm.

[0011] Furthermore, in step S4, the tubular annealing furnace includes a heating section and a heat preservation section. The copper wire is heated and dried in the heating section, and the copper wire is heat-preserved in the heat preservation section. The temperature of the heating section is controlled at 150~200℃.

[0012] Furthermore, in step S5, a permanent magnet wire feeding frame is used to cooperate with the high-speed stranding machine for stranding, and the displacement sensor detects the swing arm offset of the permanent magnet wire feeding frame. The wire tension deviation is calculated based on the swing arm offset, and the tension deviation is transmitted to the stranding machine frequency converter for stranding speed adjustment to control the tension deviation within a preset fluctuation range.

[0013] The cable conductor of this invention is implemented using the following technical solution: A cable conductor is prepared using the aforementioned high roundness and high flexibility cable conductor manufacturing process.

[0014] The cable of the present invention is implemented using the following technical solution: A cable includes a cable conductor, an insulation layer, a shielding layer, and a sheath layer, which are sequentially wrapped from the inside out. The cable conductor is manufactured using the aforementioned high roundness and high flexibility cable conductor manufacturing process.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The high roundness and high flexibility cable conductor manufacturing process, cable conductor, and cable of this invention eliminate internal stress during copper wire drawing through a continuous annealing step, thereby increasing the elongation of the copper wire and improving the flexibility of the cable conductor. The tubular annealing step produces oxidation-resistant, low-resistance copper wire and eliminates localized strength abrupt changes in the copper wire, further contributing to improved roundness and flexibility of the cable conductor. Therefore, compared to existing technologies, this invention effectively improves the deficiencies in roundness and flexibility of cable conductors, making it better suited for applications such as high-speed elevators. Attached Figure Description

[0016] Figure 1 This invention relates to a manufacturing process for high roundness and high flexibility cable conductors. Detailed Implementation

[0017] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0018] refer to Figure 1 This invention provides a manufacturing process for a cable conductor with high roundness and high flexibility, which includes steps S1 to S5.

[0019] S1. Copper drawing process: The copper rod is drawn using a large drawing machine to obtain a copper wire with a diameter of the first target value. The diameter of the copper rod can be 8.0 mm, and the first target value can be 2.0~3.0 mm, that is, the copper rod is drawn using a large drawing machine to obtain a copper wire with a diameter of 2.0~3.0 mm.

[0020] S2, Copper intermediate drawing continuous annealing step: The copper wire obtained in step S1 is drawn using an intermediate drawing machine to reduce the diameter of the copper wire to the second target value, and the wire output from the intermediate drawing machine is continuously annealed directly using an annealing machine; wherein, the second target value can be 0.8~1.2mm, that is, the diameter of the copper wire is reduced to 0.8~1.2mm by the intermediate drawing machine.

[0021] In step S2, the annealing machine includes a preheating zone, an annealing zone, and a drying zone. The preheating zone, annealing zone, and drying zone are arranged in a triangular configuration, so that the copper wire travels in an S-shaped path when passing through the annealing machine. The S-shaped path includes two path bends, and the angle of each path bend is 60 degrees. The temperature of the preheating zone is controlled at 300~350℃, the temperature of the annealing zone is controlled at 500~550℃, and the temperature of the drying zone is controlled at 150~200℃.

[0022] In step S2, the S-shaped travel path with two path turns can effectively homogenize the stress, and the bidirectional shear strain can promote dislocation cross-slip, further improving the stress relief rate and elongation (elongation is a key parameter for improving flexibility), and also helps to improve the roundness of the copper wire.

[0023] S3, Copper wire drawing step; The copper wire obtained in step S2 is drawn using a small drawing machine to reduce the diameter of the copper wire to the third target value; The third target value can be 0.05~0.5mm, that is, the diameter of the copper wire is reduced to 0.05~0.5mm by the small drawing machine.

[0024] S4. Tubular annealing step: The wires from the small drawing machine are directly heated, dried, and kept warm in a tubular annealing furnace. Then, the wires from the tubular annealing furnace are introduced into a circulating cooling water tank containing antioxidants for impurity precipitation. The tubular annealing furnace includes a heating section and a holding section. The copper wires are heated and dried in the heating section and kept warm in the holding section. The temperature of the heating section is controlled at 150~200℃.

[0025] Step S4 produces copper wire conductors that are resistant to oxidation and have low resistance, and effectively eliminates local strength abrupt changes, which helps to improve the roundness and flexibility of the cable conductor.

[0026] S5. Stranding Step: The copper wires prepared in steps S1 to S4 are stranded into a cable conductor. In step S5, a permanent magnet wire feeding frame is used in conjunction with a high-speed stranding machine for stranding. The offset of the swing arm of the permanent magnet wire feeding frame is detected by a displacement sensor. The wire tension deviation is calculated based on the swing arm offset. The tension deviation is then transmitted to the frequency converter of the stranding machine to adjust the stranding speed, thereby controlling the tension deviation within a preset fluctuation range, such as ±0.5N or a value within these two endpoints.

[0027] Step S5 uses a permanent magnet wire feeding frame in conjunction with a high-speed stranding machine to replace the traditional friction-based tension control production. The stranding speed is automatically adjusted by displacement sensors and stranding machine frequency converters to keep the tension deviation within a small fluctuation range, thereby improving the accuracy and roundness of the cable conductor.

[0028] This invention also provides a cable conductor, which is manufactured using the high roundness and high flexibility cable conductor manufacturing process described in this embodiment.

[0029] This invention also provides a cable comprising, from the inside out, a cable conductor, an insulation layer, a shielding layer, and a sheath layer, wherein the cable conductor is manufactured using the high roundness and high flexibility cable conductor manufacturing process described in this embodiment.

[0030] In summary, compared with the prior art, the embodiments of the present invention can effectively improve the defects of insufficient roundness and flexibility of cable conductors, and thus can be better applied in application scenarios such as high-speed elevators.

[0031] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A manufacturing process for a cable conductor with high roundness and high flexibility, characterized in that, Includes the following steps: S1, Copper Large Drawing Step: The copper rod is stretched using a large drawing machine to obtain a copper wire with a diameter of the first target value; S2, Copper intermediate drawing continuous annealing step: The copper wire obtained in step S1 is stretched by an intermediate drawing machine to reduce the diameter of the copper wire to the second target value, and the wire output from the intermediate drawing machine is continuously annealed by an annealing machine. S3, Copper wire drawing step; The copper wire obtained in step S2 is drawn using a small drawing machine to reduce the diameter of the copper wire to the third target value; S4, Tubular annealing step: The output wire of the small drawing machine is heated, dried and kept warm in a tubular annealing furnace. Then the output wire of the tubular annealing furnace is introduced into a circulating cooling water tank with added antioxidants for impurity precipitation treatment. S5. Stranding step: Strand multiple copper wires prepared in steps S1 to S4 into a cable conductor.

2. The manufacturing process for high roundness and high flexibility cable conductors as described in claim 1, characterized in that, In step S1, the diameter of the copper rod is 8.0 mm, and the first target value is 2.0~3.0 mm.

3. The manufacturing process for high roundness and high flexibility cable conductors as described in claim 1, characterized in that, In step S2, the second target value is 0.8~1.2mm.

4. The manufacturing process for high roundness and high flexibility cable conductors as described in claim 1, characterized in that, In step S2, the annealing machine includes a preheating zone, an annealing zone, and a drying zone. The preheating zone, annealing zone, and drying zone are arranged in a triangular configuration, so that the copper wire travels in an S-shaped path when passing through the annealing machine. The S-shaped path includes two path turns, and the angle of each path turn is 60 degrees.

5. The manufacturing process for high roundness and high flexibility cable conductors as described in claim 4, characterized in that, The temperature of the preheating zone is controlled at 300~350℃, the temperature of the annealing zone is controlled at 500~550℃, and the temperature of the drying zone is controlled at 150~200℃.

6. The manufacturing process for high roundness and high flexibility cable conductors as described in claim 1, characterized in that, In step S3, the third target value is 0.05~0.5mm.

7. The manufacturing process for high roundness and high flexibility cable conductors as described in claim 1, characterized in that, In step S4, the tubular annealing furnace includes a heating section and a heat preservation section. The copper wire is heated and dried in the heating section and heat-preserved in the heat preservation section. The temperature of the heating section is controlled at 150~200℃.

8. The manufacturing process for high roundness and high flexibility cable conductors as described in claim 1, characterized in that, In step S5, a permanent magnet wire feeding frame is used to cooperate with a high-speed stranding machine for stranding. The displacement sensor detects the swing arm offset of the permanent magnet wire feeding frame, calculates the wire tension deviation based on the swing arm offset, and transmits a signal to the stranding machine frequency converter based on the tension deviation to adjust the stranding speed, so as to control the tension deviation within a preset fluctuation range.

9. A cable conductor, characterized in that, The cable conductor is manufactured using the high roundness and high flexibility cable conductor manufacturing process as described in any one of claims 1-8.

10. A cable, characterized in that, It includes a cable conductor, an insulation layer, a shielding layer, and a sheath layer that are sequentially wrapped from the inside out. The cable conductor is manufactured using the high roundness and high flexibility cable conductor manufacturing process as described in any one of claims 1-8.

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