Low-voltage molded wire stranded conductor and manufacturing method thereof

Abstract

The invention provides a manufacturing method and system of a low-voltage molded wire stranded conductor, and belongs to the technical field of wires and cables. The manufacturing method comprises the following steps: providing a central wire core and a plurality of peripheral wire cores, and primarily stranding the central wire core and the peripheral wire cores by using a stranding machine to form a primarily stranded molded conductor; then, the conductor is subjected to step-by-step drawing forming through one or more forming units, so that the expected conductor size is achieved. The forming unit comprises a heating module and a drawing die, the heating module adopts an electromagnetic induction heating mode to rapidly heat the drawing die, so that the peripheral wire core is softened when passing through the drawing die, and the drawing forming efficiency and the conductor quality are improved. Meanwhile, the invention provides a manufacturing system which comprises a wire feeding unit, a twisting unit, a forming unit, a winding unit and a control unit.

Description

Technical Field

[0001] The invention belongs to the technical field of electric wires and cables, and in particular relates to a low-voltage special-shaped conductor and a production method thereof. Background Art

[0002] With the rapid development of power transmission and communication technology, low-voltage cables, as important energy transmission carriers, are widely used in many fields such as industry, construction, and transportation. As the core component of the cable, the structure and performance of the conductor directly affect the transmission efficiency and service life of the cable. Traditional circular stranded conductors have problems such as low space utilization, uneven current distribution, and low efficiency of the forming process in certain specific application scenarios. In order to solve these technical bottlenecks, special-shaped stranded conductors have gradually attracted attention. Special-shaped conductors can effectively improve the filling factor of the conductor, reduce the gap, and improve the conductive properties and mechanical strength of the conductor by optimizing the cross-sectional shape of the conductor. However, in the production process of special-shaped conductors, the molding quality is difficult to guarantee due to the complex twisting process of multiple wires, the material is easily damaged during the drawing process, and the temperature control accuracy is not high. Therefore, the development of an efficient and controllable method and system for manufacturing low-voltage shaped wire stranded conductors has important practical significance and broad market prospects.

[0003] According to the relevant disclosed technologies, the technical solution with publication number CN110743930A proposes a method for forming a square wire conductor, which produces a square cable conductor by adopting a pressing roller and a matching mold; the technical solution with publication number WO2022120905A1 proposes a method for producing a cable including multiple strands of small-diameter special-shaped conductors, which uses nano-scale semi-conductive glue to make the multiple strands of conductors fit tightly to form a tight whole; the technical solution with publication number KR1020140004030A proposes a cable with a filling material of a special shape, so as to achieve effective interaction between the twisted pair cable and the shielding layer.

[0004] The above technical solutions all propose several optimization technical solutions for improving the performance of cables using special-shaped conductors. However, for application conditions with higher requirements, the relevant technologies need to be further improved.

[0005] The foregoing discussion of the background art is intended only to facilitate an understanding of the present invention. This discussion does not acknowledge or admit that any of the material referred to is part of the common general knowledge. Summary of the invention

[0006] The object of the present invention is to provide a method and system for manufacturing a low-voltage stranded conductor, the manufacturing method comprising: providing a central core and multiple peripheral cores, and using a stranding machine to preliminarily strand them to form a preliminarily stranded conductor; then, the conductor is drawn and formed step by step through one or more forming units to achieve the desired conductor size. The forming unit comprises a heating module and a drawing die, wherein the heating module uses electromagnetic induction heating to quickly heat the drawing die, so that the peripheral cores soften when passing through the drawing die, thereby improving the drawing efficiency and conductor quality. At the same time, a manufacturing system is proposed, including a wire feeding unit, a stranding unit, a forming unit, a winding unit, and a control unit.

[0007] The present invention adopts the following technical solution: a method for manufacturing a low-voltage stranded conductor, the manufacturing method is used to prepare a stranded special-shaped conductor with a special cross-sectional shape; the manufacturing method comprises the following steps:

[0008] S100: provides a central core and multiple shaped wire monofilaments;

[0009] S200: twisting the central wire core and the shaped wire monofilaments by a twisting machine to obtain a pre-twisted shaped conductor, wherein the twisting tightness of the shaped wire monofilaments of the pre-twisted shaped conductor is in a generally tight state;

[0010] S300: pulling the initially twisted conductor through one or more forming units to shape the initially twisted conductor to a desired conductor size;

[0011] Among them, the molding unit includes a heating module and a drawing die; the heating module uses electromagnetic induction to quickly heat the drawing die, so that the molded wire monofilament is softened when passing through the drawing die, thereby improving the drawing molding efficiency.

[0012] Preferably, in step S300, the one or more molding units process the pre-twisted conductor step by step to the finished conductor specification in a step-by-step drawing and molding manner.

[0013] Preferably, in step S200, a tension control unit is used to maintain uniform tension on the monofilaments of the shaped wire during the twisting process.

[0014] Preferably, in step S300, the heating temperature of the drawing die is monitored to control the heating efficiency of the heating module.

[0015] At the same time, a low-voltage stranded conductor manufacturing system is proposed, and the manufacturing system is applied to the manufacturing method; the manufacturing system includes a wire feeding unit, a stranding unit, a molding unit, a winding unit and a control unit;

[0016] The wire feeding unit is used to store and transport a single monofilament of the molded wire;

[0017] The twisting unit is used to twist a plurality of shaped wire monofilaments around the periphery of the core wire into a shape;

[0018] The molding unit is used to heat the conductor that has been initially twisted and further twist it to achieve the desired conductor specifications;

[0019] The winding unit is used to wind the stranded conductor into a coil;

[0020] The control unit is used to coordinate the above working units to work together.

[0021] Preferably, the molding unit includes a heating module and a drawing die; the heating module uses electromagnetic induction to quickly heat the drawing die so that the molded wire monofilament is softened when passing through the drawing die, thereby improving the drawing molding efficiency.

[0022] Preferably, the heating module includes a rotating body and a driving component; a plurality of magnets are arranged on the working surface of the rotating body; the driving part is used to drive the rotating body to rotate, so that the plurality of magnets rotate with one of the normals of the working surface as the rotation axis, so as to generate an induced current in the drawing die and finally heat the drawing die.

[0023] The beneficial effects achieved by the present invention are:

[0024] 1. This technical solution uses an electromagnetic induction heating module to quickly heat the drawing die, ensuring that the outer core remains softened when passing through the drawing die, effectively reducing the friction resistance and deformation resistance of the wire during the drawing process, thereby improving the efficiency and stability of the drawing process. At the same time, the heating temperature is monitored and dynamically adjusted in real time through the temperature control program to ensure accurate control of the heating temperature and avoid material performance degradation or drawing defects caused by overheating or insufficient temperature.

[0025] 2. This technical solution uses a step-by-step drawing process during the drawing process to gradually draw and accurately form the pre-twisted conductor through multiple forming units, ensuring that the size control of each stage of the drawing die is evenly transitioned to avoid structural cracking or stress concentration caused by sudden deformation of the material. In addition, the multi-stage drawing process can effectively reduce conductor surface defects and significantly improve the cross-sectional dimensional accuracy and finished product quality of the conductor.

[0026] 3. The production system of this technical solution can be applied to the production of stranded conductors with various specifications and size requirements, thereby improving production efficiency and reducing overall production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention can be further understood from the following description in conjunction with the accompanying drawings. The components in the figures are not necessarily drawn to scale, but the emphasis is placed on illustrating the principles of the embodiments. In different views, the same reference numerals designate corresponding parts.

[0028] Description of the accompanying drawings: 10-core wire; 12-molded wire monofilament; 100-production system; 110-feeding unit; 120-twisting unit; 122-tension control unit; 150-molding unit; 152-heating module; 154-drawing die; 156-mold cavity; 161-rotating body; 163-driving component; 165-temperature sensor; 169-magnet; 171-working surface; 500-computer system; 502-bus; 504-processor; 506-main memory; 508-read-only memory; 510-storage device; 512-display; 514-input device; 516-cursor control device; 518-network device;

[0029] Figure 1 is a schematic diagram of a production system according to an embodiment of the present invention;

[0030] Figure 2 is a schematic diagram of an exemplary stranded conductor in an embodiment of the present invention;

[0031] Figure 3 is a schematic diagram of the molding unit described in an embodiment of the present invention;

[0032] Figure 4 is a schematic diagram of a heating module according to an embodiment of the present invention;

[0033] Figure 5 Schematic diagram of a computer system used by a control unit in an embodiment of the present invention. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with its embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. For those skilled in the art, after reviewing the following detailed description, other systems, methods and / or features of the present embodiment will become apparent. It is intended that all such additional systems, methods, features and advantages are included in this specification. Included within the scope of the present invention and protected by the appended claims. Additional features of the disclosed embodiments are described in the following detailed description, and these features will be apparent from the following detailed description.

[0035] The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right" and the like indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation. The invention is constructed and operated in a specific orientation, so the terms describing the positional relationship in the drawings are only used for exemplary description and cannot be understood as a limitation of this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0036] Embodiment 1: Exemplarily, a method for manufacturing a low-voltage stranded conductor is provided, and the manufacturing method is applied to prepare a stranded special-shaped conductor with a special cross-sectional shape; the manufacturing method comprises the following steps:

[0037] S100: provides a central core and multiple shaped wire monofilaments;

[0038] S200: twisting the central wire core and the shaped wire monofilaments by a twisting machine to obtain a pre-twisted shaped conductor, wherein the twisting tightness of the shaped wire monofilaments of the pre-twisted shaped conductor is in a generally tight state;

[0039] S300: pulling the initially twisted conductor through one or more forming units to shape the initially twisted conductor to a desired conductor size;

[0040] Among them, the molding unit includes a heating module and a drawing die; the heating module uses electromagnetic induction to quickly heat the drawing die, so that the molded wire monofilament is softened when passing through the drawing die, thereby improving the drawing molding efficiency.

[0041] Preferably, in step S300, the one or more molding units process the pre-twisted conductor step by step to the finished conductor specification in a step-by-step drawing and molding manner.

[0042] Preferably, in step S200, a tension control unit is used to maintain uniform tension on the monofilaments of the shaped wire during the twisting process.

[0043] Preferably, in step S300, the heating temperature of the drawing die is monitored to control the heating efficiency of the heating module.

[0044] At the same time, a low-voltage stranded conductor manufacturing system is proposed, and the manufacturing system is applied to the manufacturing method; the manufacturing system includes a wire feeding unit, a stranding unit, a molding unit, a winding unit and a control unit;

[0045] The wire feeding unit is used to store and transport a single monofilament of the molded wire;

[0046] The twisting unit is used to twist a plurality of shaped wire monofilaments around the periphery of the core wire into a shape;

[0047] The molding unit is used to heat the conductor that has been initially twisted and further twist it to achieve the desired conductor specifications;

[0048] The winding unit is used to wind the stranded conductor into a coil;

[0049] The control unit is used to coordinate the above working units to work together.

[0050] Preferably, the molding unit includes a heating module and a drawing die; the heating module uses electromagnetic induction to quickly heat the drawing die so that the molded wire monofilament is softened when passing through the drawing die, thereby improving the drawing molding efficiency.

[0051] Preferably, the heating module includes a rotating body and a driving component; a plurality of magnets are arranged on the working surface of the rotating body; the driving part is used to drive the rotating body to rotate, so that the plurality of magnets rotate with one of the normals of the working surface as the rotation axis, so as to generate an induced current in the drawing die and finally heat the drawing die.

[0052] To simplify the description, Figure 2 Taking a type of wire conductor as an example, an exemplary implementation of the manufacturing method and the manufacturing system used in the present technical solution is described.

[0053] The conductor structure of the profiled wire conductor shown includes a core wire 10, which can be a circular wire structure or other required structures, such as a regular hexagon, a regular octagon, etc. The outer side of the core wire 10 is annularly twisted with multiple profiled wire monofilaments 12, and the cross-sectional shape of the profiled wire monofilaments 12 can be a trapezoid, or can be other required shapes, such as a fan-shaped, approximately trapezoidal, approximately other polygonal, etc. Figure 2 The conductor structure shown is only an example of a conductor structure for convenience of description, and is not a conductor structure that is restrictive of the present technical solution.

[0054] Now return to the attached Figure 1 , attached Figure 1 In the manufacturing system shown, in an exemplary embodiment, the manufacturing system includes a wire feeding unit 110, a twisting unit 120, a molding unit 150, a winding unit, and a control unit (not shown in the figure). The control unit is communicatively connected to the other units in the manufacturing system 100 to coordinate the units to work together.

[0055] The wire feeding unit 110 is used to store and transport a single shaped wire monofilament 12; the wire feeding unit 110 is equipped with a tension control device to ensure uniform tension of the wire during the wire-releasing process to prevent the wire from being tangled or broken.

[0056] The twisting unit 120 is used to twist multiple wire monofilaments 12 around the core wire 10; the twisting unit 120 can be configured to be installed on a cage twisting machine, a tubular twisting machine or a frame twisting machine, and can twist the wire monofilaments 12 according to the set twisting pitch and angle. Figure 1 The twisting unit 120 shown in the figure is only a part for one shaped wire monofilament 12 , and a plurality of twisting units 120 may be provided in the twisting machine to correspond to the twisting of each shaped wire monofilament 12 .

[0057] Preferably, the twisting unit 120 can work in conjunction with the tension control unit 122; the tension control unit 122 is communicatively connected to the control unit, and is used to monitor and adjust the tension of each shaped wire monofilament 12 in real time during the twisting process to prevent the shaped wire monofilament 12 from loosening or over-stretching, thereby ensuring tight and uniform twisting.

[0058] Preferably, the manufacturing system 100 may further include a winding unit for winding the twisted conductor into a coil for subsequent processing or transportation.

[0059] Exemplarily, as shown in FIG. 3 , the molding unit 150 includes a heating module 152 and a drawing die 154. The heating module 152 adopts electromagnetic induction heating, and a rotating magnet is used to generate a periodically changing magnetic field relative to the conductive member, thereby generating an induced current and heating the conductive member.

[0060] For example, in conjunction with Figure 3 and attached Figure 4 As shown, the heating module 152 includes a rotating body 161 and a driving component 163. A plurality of magnets 169 are disposed on the surface of the working surface 171 of the rotating body 161. On one side of the working surface 171, a plurality of magnets 169 are arranged with two or more concentric circles as tracks.

[0061] The driving component 163 is used to drive the rotating body 161 to rotate around its center O. Preferably, the driving component 163 includes a driving motor and a related transmission device to provide rotational power to the rotating body 161. The driving motor and the rotating body 161 can be arranged in a non-coaxial manner, and a transmission device such as a chain or a belt is used to connect the driving motor and the rotating body 161.

[0062] In one embodiment, as shown in the accompanying drawings, concentric circles C1 and C2 with radii R1 and R2 are set with the center O of the rotating body 161 as the center. In each circle, a plurality of magnets 169 are set along the circular trajectory. For example, the number and arrangement of the magnets 169 on each circle are only used as examples of the technical solution, and are not used as limitations of the technical solution.

[0063] Preferably, a through hole is provided at the center of the rotating body 161 to allow the conductor to be twisted and formed to pass through the through hole and continue to enter the cavity 156 of the drawing die 154 at the rear end.

[0064] Furthermore, the magnet 169 is preferably cylindrical and at least partially embedded in the rotating body 161 to ensure that the magnet 169 is completely fixed on the rotating body 161 .

[0065] Preferably, the magnet 169 can be a rare earth magnet such as a ferrite magnet, a samarium-cobalt magnet, a neodymium magnet, an aluminum-nickel-cobalt magnet, or the like.

[0066] Preferably, all the magnets 169 on the rotating body 161 are arranged with the same polarity, for example, all the magnets 169 are set to be N poles or S poles at one end close to the drawing die 154 .

[0067] In one embodiment, the magnets 169 on each concentric circular trajectory (such as circle C1 and circle C2 in this embodiment) can be cylindrical magnets of the same size. In some embodiments, the magnets 169 on the same circular trajectory can have the same specifications, but magnets 169 of different specifications and sizes can be used on different circular trajectories.

[0068] Preferably, the radius of the cylindrical magnet 169 may be 3 mm to 12 mm, or more preferably, may be 5 mm to 10 mm.

[0069] Preferably, the height of the cylindrical magnet 169 is between 1 and 4 times the radius, and more preferably, between 5 mm and 30 mm.

[0070] Further, as attached Figure 4 As shown, the centers of any two magnets 169 are set to p1 and p2, and the radii of the two are set to r1 and r2, then the distance D between the two adjacent magnets 169 is defined as the distance between the two centers minus the radii of the two circles, that is, D = (p1, p2) - r1 - r2. Preferably, for any two adjacent magnets 169, the minimum value of the distance D is 2 times r1 or r2 (the larger value of the two). And the maximum value of the distance D is preferably 4 times r1 or r2 (the larger value of the two).

[0071] Reasonable design of the distance between magnets is crucial to optimizing the effect of electromagnetic induction heating. First of all, the distance between magnets directly affects the distribution of the magnetic field on the heated object and the uniformity of the magnetic flux density. When the distance between magnets is too close, the magnetic fields between adjacent magnets will interfere with each other, resulting in uneven magnetic flux density, reduced efficiency of induced current generation, and affected heating effect. When the distance between magnets is too large, the coverage of the magnetic field on the surface of the heated object becomes sparse, the eddy current effect is weakened, and the heating efficiency is also reduced. Therefore, it is necessary to find a balance between the two to ensure uniform distribution of the magnetic field and optimal induced current effect.

[0072] When measured in actual applications, when the distance D between adjacent magnets 169 is set between 20mm and 45mm, the heating effect reaches the best state, the magnetic flux density is relatively uniform, and the induced current can be efficiently distributed on the surface of the heated object. In addition, within this range, the ineffective diffusion of the magnetic field is effectively suppressed, and the energy utilization rate is significantly improved. Among them, when the distance D between adjacent magnets is between 30mm and 35mm, the magnetic flux density reaches a peak value, and the heating efficiency is the best. This optimized design not only reduces magnetic field interference, but also effectively improves the uniformity of eddy current distribution, reduces energy loss, and enables more energy to be effectively transferred to the heated object, ensuring that the entire heating process is more efficient and stable.

[0073] Further, attached Figure 4 A structure of the drawing die 154 is also schematically shown in FIG. Preferably, the drawing die is disc-shaped as a whole, and has a mold cavity 156 in the center for limiting the shape of the conductor that is further drawn and formed after preliminary twisting. The mold cavity 156 has the same or similar shape as the finished wire conductor. Two or more forming units 150 can be provided to achieve multi-stage drawing and forming.

[0074] Among them, each molding unit 150 can be configured with the same heating module 152, but a different drawing die 154. The molding cavity design of each level of the drawing die 154 follows the principle of gradual transition and precise molding. Preferably, the first-level drawing die is mainly responsible for the initial molding, and the conductor after twisting is adjusted to a large extent, while ensuring the uniform flow of the material and the integrity of the internal structure. The cross-sectional shape of the mold is close to the target shape, but a certain margin is retained to lay the foundation for subsequent drawing. The second drawing die further refines the cross-sectional shape of the conductor to make it closer to the design standard, focusing on dimensional accuracy and material uniformity, while reducing surface defects. For conductors that require higher precision, the third and above drawing dies will be fine-tuned to ensure that the cross-sectional dimensions of the conductor reach micron-level accuracy, the edges are smooth, and the surface quality meets the design requirements.

[0075] The entire drawing process adopts gradual transition and compression ratio control. By reasonably setting multiple molding units 150, the deformation area between the mold cavity 156 of each drawing die 154 can be smoothly transitioned to avoid sudden deformation and material cracking. Key design parameters include entry angle, compression angle, working area length and lubrication channel to ensure uniform deformation and stable flow of the conductor during the drawing process. By reasonably designing and precisely controlling the shape and process parameters of each drawing die, high-precision, uniform cross-section and smooth surface special-shaped conductors can be produced.

[0076] Preferably, the drawing die 154 and the mold cavity 156 can be modularly arranged, that is, the drawing die 154 can be of a uniform design size, and by using different mold cavities 156 in combination, the production cost can be reduced. Among them, in order to achieve better heating efficiency, the drawing die 154 can be made of aluminum or aluminum alloy. Aluminum and aluminum alloy materials are both materials with good thermal conductivity and electrical conductivity. Electromagnetic induction can be used to generate induced current (eddy current) inside the drawing die 154, thereby quickly releasing heat and achieving a uniform heating effect. And preferably, the outside of the drawing die 154 can be wrapped with heat-insulating materials, such as asbestos, heat-insulating yarn and other materials, so as to reduce the heat and air conduction of the drawing die 154, so as to improve the heat retention effect of the drawing die 154.

[0077] Preferably, the material of the mold cavity 156 may be different from that of the drawing die 154. The mold cavity 156 may be made of a hard alloy, such as hard die steel, which has high hardness and strength, and is heat treated to improve its own hardness and wear resistance, so that the size can be maintained during a long-term drawing process to meet the molding requirements of the conductor.

[0078] Embodiment 2: This embodiment should be understood to include at least all the features of any of the above embodiments, and further improve on the basis thereof:

[0079] In a preferred exemplary embodiment, the molding unit 150 further includes one or more temperature sensors 165. The control unit is in communication with the temperature sensors 165 and the driving component 163. The control unit calculates the required rotation speed of the driving motor by a control program based on the temperature feedback from one or more temperature sensors 165 to adjust the heating effect of the heating module 152 on the drawing die 154.

[0080] In a preferred exemplary embodiment, a temperature sensor 165 is provided at one or more locations of the drawing die 154, such as at the entrance, middle or exit of the die cavity 156, so as to comprehensively monitor the temperature distribution of the conductor at different stages. Optionally, the temperature sensor 165 can be a thermocouple or an infrared temperature sensor to achieve high-precision and fast-response temperature monitoring.

[0081] Furthermore, the temperature sensor transmits the detected real-time temperature data to the control unit; the control unit compares the temperature data with a preset target temperature range to determine whether the current heating temperature meets the process requirements.

[0082] When the temperature is lower than the target temperature, the control unit increases the speed of the drive motor to increase the rotation speed of the rotating body 161, thereby increasing the frequency of magnetic field changes and increasing the rate of electromagnetic induction heating. When the temperature is higher than the target temperature, the control system reduces the rotation speed of the rotating body 161, reduces the frequency of magnetic field changes, thereby slowing down the heating rate and avoiding overheating. The rotation speed of the rotating body 161 directly affects the frequency of magnetic field changes and the heating intensity. Based on the feedback data of the temperature sensor, the control system accurately controls the rotation speed of the rotating body by adjusting the speed of the drive motor 163.

[0083] Preferably, the control program run by the control unit also includes setting a segmented temperature control strategy for multiple molding units 150 according to the drawing requirements at different stages. For example, the drawing die of the molding unit located in the initial stage of drawing is set to a higher temperature to accelerate the softening of the molded wire monofilament 12; and a correspondingly lower temperature is set for the drawing die located in the later stage to prevent excessive softening.

[0084] Preferably, the following calculation formula may be used to calculate and set the rotation angular velocity ω of the rotating body 161:

[0085]

[0086] In Formula 1, ω0 is the initial rotation angular velocity, which can be zero or set to an initial non-zero value.

[0087] e(t) represents the real-time temperature T means With the target temperature T set The deviation value is:

[0088] e(t)=│T set -T means │;

[0089] t is a time variable, that is, the controlled rotation angular velocity ω(t) is output based on the error value e(t) at each moment t.

[0090] Among them, K p K is the proportional gain weight to control the rotation angular velocity ω based on the fast response of real-time temperature. i K is the integral gain weight to eliminate the steady-state error, where ∫e(t)·dt is the accumulated value of the temperature error over time. d is the differential gain, which is used to suppress the rate of error change. Indicates the rate of change of temperature error.

[0091] And, K p , K i and K d It can be obtained based on the following calculation formula through experiments and the need for temperature control:

[0092]

[0093] In Formula 2, T is the target temperature, T0 is the initial temperature of the drawing die 154, η is the thermal conductivity of the drawing die 154 measured in the laboratory; B is the magnetic field strength at the current working distance between the drawing die 154 and the rotating body 161; σ is the drawing die 154 and the conductivity of the drawing die 154, V is the volume of the drawing die 154, t is the heating time, ρ is the average density of the drawing die 154 or the drawing die 154 and the cavity 156 as a whole; C is the specific heat capacity of the drawing die 154 or the drawing die 154 and the cavity 156 as a whole.

[0094] Through the above rotation speed control algorithm, the heating temperature of the drawing die can be dynamically adjusted, and the technicians can quickly set the control algorithm to simplify the use of the production system by changing the specific values ​​of each parameter according to the different material requirements of the core wire and the molded wire monofilament produced.

[0095] Embodiment 3: This embodiment should be understood to include at least all the features of any of the above embodiments, and further improve on the basis thereof:

[0096] For example, Figure 5 The schematic diagram of the computer system 500 used by the control unit in the production system implemented in this article is depicted; the computer system 500 can realize the working control of each working unit, module, and component in the system according to the current control program; and also includes the collection, storage and processing of working data and detection data generated during the operation of the system, so as to ultimately achieve the expected effect of the fluorescent labeling system.

[0097] The computer system 500 includes a bus 502 or other communication mechanism for transmitting information, and one or more processors 504 coupled to the bus 502 for processing information; the processor 504 may be, for example, one or more general-purpose microprocessors;

[0098] The computer system 500 also includes a main memory 506, such as a random access memory (RAM), a cache, and / or other dynamic storage device, coupled to the bus 502 for storing information and instructions to be executed by the processor 504; the main memory 506 may also be used to store temporary variables or other intermediate information during the execution of instructions to be executed by the processor 504; these instructions, when stored in a storage medium accessible to the processor 504, present the computer system 500 as a special-purpose machine customized to perform the operations specified in the instructions;

[0099] The computer system 500 may also include a read-only memory (ROM) 508 or other static storage device coupled to the bus 502 for storing static information and instructions for the processor 504; a storage device 510 such as a disk, an optical disk, or a USB drive (flash drive) will be coupled to the bus 502 for storing information and instructions;

[0100] And further, coupled to the bus 502 may also include a display 512 for displaying various information, data, media, etc., an input device 514 for allowing a user of the computer system 500 to control, manipulate, and / or interact with the computer system 500;

[0101] A preferred way to interact with the management system may be through a cursor control device 516, such as a computer mouse or similar control / navigation mechanism;

[0102] Furthermore, the computer system 500 may also include a network device 518 coupled to the bus 502; wherein the network device 518 may include, for example, a wired network card, a wireless network card, a switching chip, a router, a switch, and other components;

[0103] In general, the terms "engine", "component", "system", "database", etc., as used herein, may refer to logic embodied in hardware or firmware, or to a collection of software instructions, possibly with entry and exit points, written in a programming language such as Java, C, or C++; software components may be compiled and linked into executable programs, installed in a dynamic link library, or may be written in an interpreted programming language (e.g., BASIC, Perl, or Python); it should be understood that software components may be called from other components or from themselves, and / or may be called in response to detected events or interrupts;

[0104] Software components configured to execute on a computing device may be provided on a computer-readable medium, such as a compact disc, digital video disc, flash drive, diskette, or any other tangible medium, or as a digital download (and may be initially stored in a compressed or installable format that requires installation, decompression, or decryption prior to execution); such software code may be stored in part or in whole on a memory device of the executing computing device for execution by the computing device; software instructions may be embedded in firmware, such as an EPROM. It should also be understood that hardware components may consist of connected logic units (such as gates and flip-flops), and / or may consist of programmable units (such as programmable gate arrays or processors);

[0105] Computer system 500 includes the techniques described herein that may be implemented using custom hardwired logic, one or more ASICs or FPGAs, firmware, and / or program logic that, in combination with the computer system, renders computer system 500 a special-purpose computing device;

[0106] According to one or more embodiments, the techniques herein may be performed by computer system 500 in response to processor 504 executing one or more sequences of one or more instructions contained in main memory 506; such instructions may be read into main memory 506 from another storage medium, such as storage device 510; execution of the sequences of instructions contained in main memory 506 causes processor 504 to perform the process steps described herein; in alternative embodiments, hard-wired circuitry may be used in place of or in combination with software instructions;

[0107] As used herein, the term "non-transitory media" and similar terms refer to any media that store data and / or instructions that cause a machine to operate in a specific manner; such non-transitory media may include non-volatile media and / or volatile media; non-volatile media include, for example, optical or magnetic disks, such as storage device 510; volatile media include dynamic memory, such as main memory 506;

[0108] Among them, common forms of non-transitory media include, for example, floppy disks, diskettes, hard disks, solid-state drives, magnetic tapes or any other magnetic data storage medium, CD-ROMs, any other optical data storage medium, any physical medium having a pattern of holes, RAM, PROM and EPROM, FLASH-EPROM, NVRAM, any other memory chip or cartridge, and network versions thereof;

[0109] Non-transient media are distinct from transmission media but may be used in conjunction with transmission media; transmission media participate in the transmission of information between non-transient media; for example, transmission media include coaxial cables, copper wires, and optical fibers, including the wires that make up bus 502; transmission media may also take the form of sound waves or light waves, such as radio waves and infrared data communications.

Claims

1. A method for manufacturing a low-voltage stranded conductor, characterized in that: The manufacturing method is applied to prepare a twisted special-shaped conductor with a special cross-sectional shape; the manufacturing method comprises the following steps: S100: provides a central core and multiple shaped wire monofilaments; S200: twisting the central wire core and the shaped wire monofilaments by a twisting machine to obtain a pre-twisted shaped conductor, wherein the twisting tightness of the shaped wire monofilaments of the pre-twisted shaped conductor is in a generally tight state; S300: pulling the initially twisted conductor through one or more forming units to shape the initially twisted conductor to a desired conductor size; Among them, the molding unit includes a heating module and a drawing die; the heating module uses electromagnetic induction to quickly heat the drawing die, so that the molded wire monofilament is softened when passing through the drawing die, thereby improving the drawing molding efficiency.

2. The method according to claim 1, characterized in that: In step S300, the one or more forming units process the pre-twisted conductor step by step to the finished conductor specification in a step-by-step drawing and forming manner.

3. The method according to claim 2, characterized in that: In step S200, a tension control unit is used to maintain uniform tension of the monofilaments of the molded wire during the twisting process.

4. The method according to claim 3, characterized in that: In step S300, the heating temperature of the drawing die is monitored to control the heating efficiency of the heating module.

5. A low-voltage stranded conductor manufacturing system, characterized in that: The manufacturing system is applied to the manufacturing method as claimed in claim 4; the manufacturing system comprises a wire feeding unit, a twisting unit, a molding unit, a winding unit and a control unit; The wire feeding unit is used to store and transport a single monofilament of the molded wire; The twisting unit is used to twist a plurality of shaped wire monofilaments around the periphery of the core wire into a shape; The molding unit is used to heat the conductor that has been initially twisted and further twist it to achieve the desired conductor specifications; The winding unit is used to wind the stranded conductor into a coil; The control unit is used to coordinate the above working units to work together.

6. The production system according to claim 5, characterized in that: The molding unit includes a heating module and a drawing die; the heating module uses electromagnetic induction to quickly heat the drawing die so that the molded wire monofilament is softened when passing through the drawing die, thereby improving the drawing molding efficiency.

7. The production system according to claim 6, characterized in that: The heating module includes a rotating body and a driving component; a plurality of magnets are arranged on the working surface of the rotating body; the driving part is used to drive the rotating body to rotate, so that the plurality of magnets rotate with one of the normals of the working surface as the rotation axis, so as to generate an induced current in the drawing die and finally heat the drawing die.

8. A low voltage stranded conductor, characterized in that: The stranded conductor is manufactured by the manufacturing method described in any one of claims 1 to 4.

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