Ultrafine copper wire drawing constant tension control device and control method

Abstract

The application relates to the technical field of copper wire processing, in particular to a constant tension control device and control method for ultra-fine copper wire drawing, which comprises a wire conveying channel for copper wire insertion, a conveying structure which is arranged in the wire conveying channel and is arranged to slide along the copper wire conveying direction, a side pushing structure which provides moving resistance for the conveying structure, and a conductive structure, the conveying structure is used for conveying copper wire, and the conductive structure is used for controlling the speed of the copper wire conveyed by the conveying structure. Through the application, the hysteresis problem existing in the indirect control link of the traditional technology using detection, feedback and adjustment is effectively solved, the conveying structure is directly driven to move based on the change of the copper wire tension, then the resistance value of the resistance long plate connected to the circuit is changed, the wire conveying speed of the conveying structure is adjusted in real time, mechanical and electrical direct linkage is formed, signal conversion and controller operation time are eliminated, and the instantaneous tension control requirement in high-speed drawing is met.

Description

Technical Field

[0001] This invention relates to the field of copper wire processing technology, and in particular to a constant tension control device and control method for drawing ultra-fine copper wire. Background Technology

[0002] Copper wire drawing is a key process in the production of wires and cables. It involves passing copper wires of varying diameters through drawing dies with decreasing apertures. Under traction, the copper wires undergo plastic deformation, gradually reducing their diameter to the target specification. The resulting ultra-fine copper wires can reach the micrometer level in diameter and are widely used in precision electronic components, miniature transformers, high-frequency signal transmission cables, and micro-wires for medical equipment.

[0003] In the copper wire drawing process, the stability of wire tension directly determines product quality and production efficiency. Excessive tension can lead to copper wire breakage or diameter reduction, while insufficient tension can easily cause wire vibration, accumulation, or even tangled wire. Therefore, equipping the wire drawing equipment with a high-precision, fast-response tension control device is a key link to ensure continuous and stable production.

[0004] Traditional wire drawing tension control technology has the following drawbacks: First, it mostly adopts indirect measurement and independent adjustment methods, that is, it detects the tension of copper wire through a tension sensor, and then feeds the signal back to the controller, which adjusts the speed of the drive motor to form a closed-loop system of detection, feedback and adjustment. This control link is relatively long and the response is lagging, making it difficult to meet the real-time suppression of tension fluctuations during high-speed wire drawing. Second, traditional devices have a complex structure, involving multiple independent modules such as sensors, servo drives and control circuits. They not only occupy a lot of space and have high costs, but also have complicated matching and calibration between various components, making maintenance difficult. Summary of the Invention

[0005] This invention provides a constant tension control device and method for drawing ultra-fine copper wire, which can effectively solve the problems in the background art.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A constant tension control device for drawing ultra-fine copper wire includes a wire feeding channel for copper wire to pass through, a feeding structure disposed in the wire feeding channel and slidably disposed along the copper wire feeding direction, a side-pushing structure for providing moving resistance to the feeding structure, and a conductive structure. The feeding structure is used to feed copper wire, and the conductive structure is used to control the speed at which the feeding structure feeds copper wire. The conductive structure includes a resistance plate disposed in the transmission channel along the copper wire transmission direction and a brush slidably disposed on the resistance plate. Along the copper wire transmission direction, one end of the resistance plate is connected to an external circuit, and the brush is mounted on the transmission structure. The transmission structure, the brush, and the resistance plate are electrically connected in sequence.

[0007] Furthermore, the side-pushing structure includes a fixed groove disposed in the transmission channel and a connecting arm disposed on the transmission structure. The fixed groove is provided with a plurality of miniature electromagnets, which are arranged in multiple rows, and each row is arranged along the copper wire transmission direction. The miniature electromagnets in adjacent rows are staggered. The connecting arm is provided with a plurality of permanent magnets, which are used in conjunction with each row of the plurality of miniature electromagnets.

[0008] Furthermore, two conductive strips are arranged opposite each other on the fixed groove. Each conductive strip is composed of a plurality of contacts arranged along the copper wire conveying direction. The two corresponding contacts on the two conductive strips are electrically connected to the two ends of the miniature electromagnet, respectively. Two conductive plates are arranged opposite each other on the connecting arm. The conductive plates are slidably disposed on the fixed groove, and the conductive plates are electrically connected to several contacts in the corresponding area of ​​the conductive strip. The two conductive plates are connected to an external circuit, and the conductive plates move within the area where the fixed groove is located.

[0009] Furthermore, the fixing groove is provided with a conductive strip, which is composed of a plurality of contacts arranged along the copper wire conveying direction. The contacts are electrically connected to one end of the corresponding miniature electromagnet, and the other end of the plurality of miniature electromagnets is connected to an external circuit. A conductive plate is provided on the connecting arm. The conductive plate is slidably disposed on the fixed groove, and a portion of the conductive plate overlaps with a portion of the conductive strip. The conductive plate is electrically connected to several contacts on the conductive strip in the overlapping area, and the conductive plate is connected to an external circuit.

[0010] Furthermore, the control device also includes a detection structure for detecting the tension of the copper wires conveyed to the conveying structure; Two side-push structures are provided, and the two side-push structures are connected together along the copper wire conveying direction. The conductive plate is located between the two side-push structures, and the two side-push structures provide the conductive plate with opposite forces. When the detection structure detects changes in copper wire tension, the two side-push structures are driven by a lead screw to move along the copper wire conveying direction within the wire conveying channel.

[0011] Furthermore, the detection structure includes two conveying wheels arranged opposite each other along the copper wire conveying direction and a pressing wheel located between the two conveying wheels. The pressing wheel and the conveying wheels are offset in the vertical plane. The pressing wheel is provided with elastic support by a spring, and the spring's elastic force value is detected by a pressure gauge.

[0012] Furthermore, the conveying structure includes a movable platform and a feed roller and an auxiliary roller rotatably disposed within the movable platform. The feed roller has a feed groove. A drive motor that provides rotational power to the feed roller is disposed on the movable platform. The brush is mounted on the movable platform and electrically connected to the drive motor.

[0013] Furthermore, the inner walls of opposite sides of the cable tray are both arc-shaped, a partition ring is provided in the middle of the cable tray, the partition ring is fixed relative to the moving platform, a wire notch is provided on the partition ring, the copper wire in the cable tray passes through the wire notch from one side of the partition ring and is transported to the other side of the partition ring, and several side rolling bodies are rotatably provided on both sides of the partition ring.

[0014] Furthermore, the auxiliary roller includes an inner core and an outer elastic sleeve, with the core and the elastic sleeve connected by several elastic supports.

[0015] A method for controlling constant tension in ultrafine copper wire drawing includes the following steps: Passing copper wires through the conveying structure within the transmission channel; When the copper wire is drawn, the copper wire pulls the conveying structure to move within the conveying channel, the brush slides on the resistance plate, the current in the conveying structure increases, and the copper wire conveying speed increases. The side-push structure provides constant resistance to the movement of the conveying structure through a conductive plate; When the speed at which the copper wire is conveyed by the conveying structure is balanced with the traction speed of the copper wire, the copper wire is conveyed smoothly under the specified tension.

[0016] The technical solution of this invention can achieve the following technical effects: It effectively solves the lag problem existing in the indirect control link of traditional technology that uses detection, feedback and adjustment. Based on the change of the tension of the copper wire itself, it directly drives the movement of the conveying structure, thereby changing the resistance value of the resistance plate connected to the circuit and adjusting the wire feeding speed of the conveying structure in real time. It forms a direct mechanical and electrical linkage, eliminating the signal conversion and controller calculation time, meeting the instantaneous tension control requirements of high-speed wire drawing, while significantly reducing the number of components, reducing the space occupied by the equipment and the manufacturing cost. Moreover, its simple structure significantly reduces the workload of maintenance and debugging, making it suitable for long-term continuous production scenarios.

[0017] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of a constant tension control device for drawing ultra-fine copper wire; Figure 2 for Figure 1 A schematic diagram of the internal structure of the medium-speed transmission line channel; Figure 3 for Figure 2 A schematic diagram of the conductive structure in the middle; Figure 4 for Figure 2 A schematic diagram of the center-side thrust structure; Figure 5 for Figure 4 Schematic diagram of the middle connecting arm; Figure 6 for Figure 2 A schematic diagram of the detection structure in the middle; Figure 7 for Figure 2 A schematic diagram of the conveyor structure in the middle; Figure 8 for Figure 7 A schematic diagram of the internal structure of a China Mobile station; Figure 9 for Figure 8 Schematic diagram of the structure of the intermediate transmission roller and the separator ring; Figure 10 for Figure 9 Schematic diagram of the structure of the intermediate conveyor roller; Figure 11 for Figure 9 Schematic diagram of the middle separator ring; Figure 12 for Figure 11 A structural diagram from another perspective; Attached label: 100, transmission channel; 200. Conveying structure; 201. Moving table; 202. Wire conveying roller; 203. Auxiliary roller; 204. Wire conveying trough; 205. Drive motor; 206. Separating ring; 207. Wire notch; 208. Side rolling element; 209. Core column; 210. Elastic sleeve; 211. Elastic support; 300. Side-push structure; 301. Fixing groove; 302. Miniature electromagnet; 303. Connecting arm; 304. Permanent magnet; 305. Conductive strip; 306. Conductive plate; 307. Lead screw; 400. Conductive structure; 401. Resistor plate; 402. Brush; 500. Detection structure; 501. Conveyor wheel; 502. Pressure wheel; 503. Sliding column; 504. Pressure gauge; 505. Spring. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] like Figures 1 to 3 As shown, this application provides a constant tension control device for drawing ultra-fine copper wire, including a wire feeding channel 100 for copper wire to pass through, a conveying structure 200 disposed in the wire feeding channel 100 and slidably disposed along the copper wire feeding direction, a side pushing structure 300 providing moving resistance for the conveying structure 200, and a conductive structure 400. The conveying structure 200 is used to convey copper wire, and the conductive structure 400 is used to control the speed at which the conveying structure 200 conveys copper wire. The conductive structure 400 includes a resistance plate 401 disposed in the transmission channel 100 along the copper wire transmission direction and a brush 402 slidably disposed on the resistance plate 401. Along the copper wire transmission direction, one end of the resistance plate 401 is connected to an external circuit, and the brush 402 is mounted on the transmission structure 200. The transmission structure 200, the brush 402 and the resistance plate 401 are electrically connected in sequence.

[0023] Specifically, the transmission channel 100 is arranged along the copper wire transmission direction, and the copper wire can pass through the transmission channel 100 and be transported. The transmission structure 200 can actively control the copper wire transmission speed, so that the copper wire is always kept taut. When the copper wire tension is large, the transmission speed of the transmission structure 200 increases, and when the copper wire tension is small, the transmission speed of the transmission structure 200 decreases. The side-pushing structure 300 can provide the transmission structure 200 with a moving resistance opposite to the copper wire transmission direction, thereby providing tension force for the copper wire.

[0024] In the conductive structure 400, one end of the resistive plate 401 is connected to an external circuit, and the high end of the resistive plate 401 corresponds to the copper wire conveying direction. The other end of the resistive plate 401 is idle or protected by a protective cover. The brush 402 can slide on the resistive plate 401 and maintain an electrical connection with the resistive plate 401. Thus, current can be conveyed to the conveying structure 200 through the resistive plate 401 and the brush 402. When the brush 402 slides on the resistive plate 401, the distance between the end of the resistive plate 401 connected to the external circuit and the brush 402 changes, that is, the length of the resistive plate 401 connected to the circuit changes, thereby changing the circuit resistance and current, and achieving the purpose of controlling the conveying speed of the conveying structure 200.

[0025] In use, the copper wire passes through the conveying structure 200 and is actively conveyed by the conveying structure 200. When the external wire drawing machine actively pulls the copper wire, the current in the conveying structure 200 is relatively small due to the large length of the resistance plate 401 connected to the circuit. At this time, the conveying structure 200 conveys the copper wire at a slow speed. The wire drawing machine actively pulls the conveying structure 200 to move in the wire feeding channel 100 through the copper wire. The conveying structure 200 then drives the brush 402 to move on the resistance plate 401. At this time, the length of the resistance plate 401 connected to the circuit gradually decreases, and the current in the conveying structure 200 gradually increases. The conveying structure 200 gradually increases the speed of the copper wire. When the speed of the copper wire conveyed by the conveying structure 200 is consistent with the speed of the copper wire pulled by the wire drawing machine, the conveying structure 200 stops in the wire conveying channel 100, the brush 402 stops on the resistance plate 401, and the side push structure 300 maintains the state of providing tension to the conveying structure 200 and the copper wire. Thus, the conveying structure 200 is moved and the copper wire conveying speed is adjusted directly by the tension and relaxation of the copper wire. This method of directly changing the conveying speed by utilizing the state characteristics of the copper wire itself makes the tension control work faster, more efficient, and more convenient to operate.

[0026] In some embodiments, the side-pushing structure 300 can be a spring, a magnetic structure, or other structure capable of providing force to the conveying structure 200 in a moving or stationary state. When the side-pushing structure 300 provides constant tension to the conveying structure 200, the copper wire can always maintain constant tension. At this time, no matter where the conveying structure 200 is or where the copper wire is conveyed at any speed, the tension of the copper wire remains unchanged. When the side-pushing structure 300 provides variable tension to the conveying structure 200, such as when the side-pushing structure 300 is a spring, the spring elongation varies with the movement of the conveying structure 200, and the tension it provides to the conveying structure 200 and the copper wire varies. If the speed at which the external wire drawing machine pulls the copper wire is constant, then the speed at which the conveying structure 200 conveys the copper wire is also constant. The position of the conveying structure 200 in the wire feeding channel 100 and the position of the brush 402 on the resistance plate 401 are also constant, that is, the elongation of the spring is constant. This can also provide constant tension to the copper wire. Both of these methods can achieve constant tension control, and both are within the scope of protection of this case.

[0027] The technical solution of this invention effectively solves the lag problem existing in the indirect control link of detection, feedback and adjustment in traditional technology. Based on the change of the tension of the copper wire itself, the conveying structure 200 is directly driven to move, thereby changing the resistance value of the circuit connected to the resistance plate 401 and adjusting the wire feeding speed of the conveying structure 200 in real time, forming a direct mechanical and electrical linkage. This eliminates the signal conversion and controller calculation time, meets the instantaneous tension control requirements of high-speed wire drawing, and significantly reduces the number of components, reduces equipment space occupation and manufacturing costs. Moreover, its simple structure significantly reduces the workload of maintenance and debugging, making it suitable for long-term continuous production scenarios.

[0028] Furthermore, such as Figure 4 and Figure 5 As shown, the side-pushing structure 300 includes a fixed groove 301 disposed in the transmission channel 100 and a connecting arm 303 disposed on the conveying structure 200. The fixed groove 301 is provided with a plurality of miniature electromagnets 302, which are arranged in multiple rows, and each row is arranged along the copper wire conveying direction. The miniature electromagnets 302 in adjacent rows are staggered. The connecting arm 303 is provided with a plurality of permanent magnets 304, which are used in conjunction with each row of miniature electromagnets 302.

[0029] On a vertical plane perpendicular to the copper wire conveying direction, several permanent magnets 304 are arranged in a linear, arc-shaped or other manner. Several miniature electromagnets 302 are arranged in multiple rows on the same vertical plane, so that one permanent magnet 304 can correspond to one row of miniature electromagnets 302, and several permanent magnets 304 can simultaneously correspond to multiple rows of miniature electromagnets 302. By utilizing the staggered arrangement of miniature electromagnets 302 in adjacent rows, the several miniature electromagnets 302 on the fixed groove 301 can provide a stable magnetic field for the connecting arm 303 in a moving or stationary state when all of them are energized, thereby providing a stable force for the conveying structure 200. Each permanent magnet 304 can cover multiple miniature electromagnets 302 on the corresponding row of miniature electromagnets 302, so that the fluctuation of the force experienced by the permanent magnet 304 when passing through different miniature electromagnets 302 is small.

[0030] It should be noted that since the miniature electromagnet 302 only needs to provide a force along the copper wire conveying direction to the permanent magnet 304 when energized, the magnetic pole direction of the miniature electromagnet 302 can be set to be opposite to the magnetic pole direction of the permanent magnet 304. That is, the force between the miniature electromagnet 302 and the permanent magnet 304 is a repulsive force, and this repulsive force can be approximately perpendicular to the copper wire conveying direction. This is because if the repulsive force is completely perpendicular to the copper wire conveying direction, the state would be extremely unstable. Furthermore, since the permanent magnet 304 can move, this perpendicular state will not exist in the above structure. That is, in actual use, there will be a certain angular misalignment between the miniature electromagnet 302 and the permanent magnet 304. This misalignment causes the miniature electromagnet 302 to... The repulsive force between the micro electromagnet 302 and the permanent magnet 304 is inclined relative to the copper wire conveying direction. The force between the micro electromagnet 302 and the permanent magnet 304 will generate a horizontal component force in the copper wire conveying direction, which can provide resistance to copper wire conveying. In addition to the above method, the permanent magnet 304 and the micro electromagnet 302 can also be staggered in the copper wire conveying direction, that is, the magnetization direction of the permanent magnet 304 is not parallel to the magnetization direction of the micro electromagnet 302. Even if the two overlap in projection, as long as the magnetic pole center is offset in the direction of movement, the magnetic field lines will be inclined, thereby generating a component force along the copper wire conveying direction. Specifically, the magnetization direction of the permanent magnet 304 can be set to be perpendicular to its direction of movement, and the magnetization direction of the micro electromagnet 302 can be set to be perpendicular to its direction of movement. Setting the angle to an acute angle (e.g., 45°) with the copper wire transport direction allows the magnetic field interaction between the permanent magnet 304 and the miniature electromagnet 302 to generate an oblique force. This oblique force is directly decomposed into horizontal and vertical components. The horizontal component is along the copper wire transport direction, thereby using magnetic force to provide resistance to the connecting arm 303. Through multi-row arrangement, the horizontal force generated by each permanent magnet 304 is superimposed. Besides the above method, the permanent magnet 304 can also be composed of multiple small magnets arranged in a Halbach array pattern. The magnetic field is concentrated on one side of the array, and the magnetic field vector changes periodically in the direction of motion. The magnetization direction of the miniature electromagnet 302 is perpendicular to the copper wire transport direction. The Halbach array produces... The generated magnetic field has a gradient in the direction of motion. When the miniature electromagnet 302 is energized, it generates a vertical magnetic field, which interacts with the gradient magnetic field to produce a horizontal magnetic reluctance thrust on the permanent magnet 304 (similar to the thrust principle of a linear motor). Alternatively, the miniature electromagnet 302 can be arranged in a Halbach array pattern, with the permanent magnet 304 as a single structure, which can achieve the same effect. In addition to the above methods, the miniature electromagnet 302 can also be arranged in a Halbach array pattern, so that each row of miniature electromagnets 302 can generate a tilting force or a force along the copper wire conveying direction on the corresponding permanent magnet 304. When the force is tilted, the combined component of the force on multiple permanent magnets 304 along the copper wire conveying direction can provide resistance to the copper wire.

[0031] Since the miniature electromagnet 302 can provide resistance to the copper wire in various ways, such as distribution, energization control, and magnetic force direction distribution, or can directly use the existing high-speed rail magnetic pushing method, it will not be elaborated here.

[0032] Furthermore, such as Figure 4 and Figure 5 As shown, two conductive strips 305 are arranged opposite each other on the fixed groove 301. The conductive strips 305 are composed of a number of contacts arranged along the copper wire conveying direction. The two corresponding contacts on the two conductive strips 305 are electrically connected to the two ends of the miniature electromagnet 302 respectively. Two conductive plates 306 are arranged opposite each other on the connecting arm 303. The conductive plates 306 slide on the fixing groove 301, and the conductive plates 306 are electrically connected to several contacts in the corresponding area of ​​the conductive strip 305. The two conductive plates 306 are connected to the external circuit, and the conductive plates 306 move within the area of ​​the fixing groove 301.

[0033] The corresponding contacts on the two conductive strips 305 and the corresponding micro electromagnets 302 on the fixed groove 301 are projected onto the copper wire conveying axis. When the two conductive plates 306 move on the fixed groove 301, they can simultaneously contact and electrically connect with the corresponding two contacts on the micro electromagnets 302, thereby connecting the micro electromagnets 302 to the circuit. The micro electromagnets 302 corresponding to the contacts separated from the conductive plates 306 are no longer connected to the circuit.

[0034] The coverage area of ​​the conductive plate 306 on the fixing groove 301 corresponds to the length of the permanent magnet 304 along the copper wire conveying direction. That is, the center point of the conductive plate 306 and the center point of the permanent magnet 304 are on the same vertical plane, and this vertical plane is perpendicular to the copper wire conveying direction. This allows the energized miniature electromagnets 302 covered by the two conductive plates 306 to be evenly located on both sides of the center point of the permanent magnet 304. Of course, the coverage area can also be arranged symmetrically with respect to the center point of the permanent magnet 304, as long as the miniature electromagnets 302 in a certain area around the connecting arm 303 can form a stable magnetic field.

[0035] Since the conductive plate 306 moves within the area of ​​the fixed groove 301, when the conveying structure 200 moves, it will drive the conductive plate 306 to move synchronously. Several miniature electromagnets 302 in the forward direction of the conveying structure 200 will be electrically connected to the conductive plate 306 in sequence, and several miniature electromagnets 302 will be gradually released from the rear side of the conductive plate 306. Thus, a fixed number of miniature electromagnets 302 are always present within the area covered by the conductive plate 306. These miniature electromagnets 302 can provide stable resistance for the conveying structure 200, so that the copper wire has constant tension.

[0036] In some embodiments, local magnetic field fluctuations are generated when the miniature electromagnets 302 are connected to or separated from the conductive plate 306. The influence of these fluctuations on constant tension can be effectively reduced by setting the arrangement of several miniature electromagnets 302. To further reduce local magnetic field fluctuations, a current control method can also be adopted. Specifically, a force sensor is installed on the conductive plate 306 to directly measure the actual force. The current magnitude is controlled and corrected in real time according to the difference between the actual force and the specified force, so that the conveying structure 200 can be subjected to a constant force. Alternatively, the magnetic field force between the miniature electromagnets 302 and the permanent magnet 304 will weaken rapidly when they are far away from the permanent magnet 304, which can strengthen the current in that part of the miniature electromagnets 302. Conversely, the magnetic field force between the miniature electromagnets 302 and the permanent magnet 304 will strengthen rapidly when they are close to the permanent magnet 304, which can weaken the current in that part of the miniature electromagnets 302. Of course, the current magnitude in each position of the miniature electromagnets 302 can also be adjusted in real time and independently according to the force on the conveying structure 200. The specific method can be selected according to the actual situation.

[0037] In addition to achieving constant force field characteristics in the above manner, the side push structure 300 can also provide the conveying structure 200 with a variable force field associated with the position of the conveying structure 200. Specifically, a conductive strip 305 is provided on the fixed groove 301. The conductive strip 305 is composed of several contacts arranged along the copper wire conveying direction. The contacts are electrically connected to one end of the corresponding micro electromagnet 302, and the other end of the several micro electromagnets 302 is connected to an external circuit. A conductive plate 306 is provided on the connecting arm 303. The conductive plate 306 is slidably disposed on the fixing groove 301, and a portion of the conductive plate 306 overlaps with a portion of the conductive strip 305. The conductive plate 306 is electrically connected to several contacts on the conductive strip 305 in the overlapping area, and the conductive plate 306 is connected to an external circuit.

[0038] Here, the number of conductive plates 306 is set to one, which is connected to one end of the miniature electromagnet 302 through a contact. The other end of the miniature electromagnet 302 is connected to an external circuit, thereby energizing the miniature electromagnet 302 corresponding to the contact that can contact the conductive plate 306, while the other miniature electromagnets 302 are in a de-energized state.

[0039] Since only a portion of the conductive plate 306 overlaps with the conductive strip 305, and the conductive plate 306 can slide on the fixing groove 301, one end of the conductive plate 306 can be slidably mounted on the fixing groove 301 from one end. During the sliding process of the conductive plate 306, the other end of the conductive plate 306 is always located outside the fixing groove 301. That is, as the conductive plate 306 slides, the number of miniature electromagnets 302 connected to the circuit gradually increases or decreases from that end of the fixing groove 301, thereby controlling the magnetic field strength applied to the conveying structure 200 according to the position of the conveying structure 200.

[0040] In use, the copper wire provides traction for the conveying structure 200, causing the conveying structure 200 to move. The speed at which the conveying structure 200 conveys the copper wire gradually increases. At the same time, the connecting arm 303 and the conductive plate 306 slide synchronously on the fixed groove 301. The overlapping area between the conductive plate 306 and the fixed groove 301 gradually increases, and the number of miniature electromagnets 302 connected to the circuit gradually increases, thereby gradually increasing the resistance of the reverse magnetic field of the copper wire conveying structure 200.

[0041] Furthermore, such as Figure 2 and Figure 4 As shown, the control device also includes a detection structure 500 for detecting the tension of the copper wire conveyed to the conveying structure 200; Two side-push structures 300 are provided, and the two side-push structures 300 are connected together along the copper wire conveying direction. The conductive plate 306 is located between the two side-push structures 300, and the two side-push structures 300 provide the conductive plate 306 with opposite forces. When the detection structure 500 detects changes in copper wire tension, the two push structures 300 are driven by the lead screw 307 to move along the copper wire conveying direction within the wire conveying channel 100.

[0042] Based on the side-push structure 300 providing a variable force to the conveying structure 200, the two side-push structures 300 are arranged opposite each other and on the same straight line. The left and right sides of the conductive plate 306 are located on the two side-push structures 300 respectively. The left side-push structure 300 provides a force to the conductive plate 306 in the direction of copper wire conveying, and the right side-push structure 300 provides a force to the conductive plate 306 in the opposite direction of copper wire conveying. When the center point of the conductive plate 306 is located between the two side-push structures 300, the forces provided by the two side-push structures 300 to the conductive plate 306 are equal and cancel each other out. When the center point of the conductive plate 306 is biased towards one side-push structure 300, that side-push structure 300 can provide a greater force to the conductive plate 306, so that the forces provided by the two side-push structures 300 to the conductive plate 306 no longer cancel each other out.

[0043] Because the distance between the copper wire and the reel shaft is relatively large when the external reel starts outputting copper wire, i.e., the lever arm is relatively long, and the copper wire on the outer side of the reel is relatively loose, the force required to pull the reel to rotate is small. In fact, due to the reel's rotational inertia, the wire can even be automatically released. At this time, the copper wire between the conveying structure 200 and the reel is in a relaxed state, and the center point of the conductive plate 306 is biased towards the right-side push structure 300. The combined force provided by the two push structures 300 to the conductive plate 306 is to the left and opposite to the direction of copper wire delivery. As the reel continues to release wire, the lever arm gradually decreases, and the density of the copper wire on the reel increases, increasing the force driving the reel to rotate. The tension of the copper wire between the conveying structure 200 and the reel gradually increases. At this time, this force will offset part of the tension of the copper wire between the conveying structure 200 and the wire drawing machine. If the relative position of the conductive plate 306 and the push structure 300 remains unchanged, then the force provided by the push structure 300 to the conductive plate 306... The sum of the tension of the copper wires rotating with the drive coil will be greater than the force exerted by the wire drawing machine when drawing the copper wires. Therefore, to ensure force balance, the lead screw 307 can drive the two push structures 300 to move to the right. This causes the leftward force provided by the two push structures 300 to the conveying structure 200 to gradually decrease while the position of the conveying structure 200 remains unchanged. When the tension required for the drive coil to rotate is greater than the traction force of the wire drawing machine, the force provided by the two push structures 300 to the conveying structure 200 is to the right. At this time, the conveying structure 200 can be regarded as providing active traction for the copper wires. Thus, using the above structure, the magnitude and direction of the force provided by the push structure 300 to the conveying structure 200 can be automatically adjusted according to the magnitude of the traction force required for the rotation of the external coil, and a bidirectional drive traction effect can be achieved. The detection structure 500 can detect the tension of the copper wires between the coil and the conveying structure 200. The lead screw 307 can be driven to rotate by a motor, and the lead screw 307 is threadedly connected to the fixed groove 301.

[0044] Furthermore, such as Figure 6 As shown, the detection structure 500 includes two conveying wheels 501 arranged opposite to each other along the copper wire conveying direction and a pressing wheel 502 located between the two conveying wheels 501. The pressing wheel 502 and the conveying wheels 501 are offset in the vertical plane. The pressing wheel 502 is provided with elastic support by a spring 505. The spring 505 is tested by a pressure gauge 504.

[0045] The pressure roller 502 can slide and convey the wire on the wire conveying channel 100 via the slide column 503. The pressure roller 502 is rotatably mounted on the slide column 503. Both conveying rollers 501 are rotatably mounted in the wire conveying channel 100. The spring 505 can provide an elastic force to the pressure roller 502, and the spring 505 can detect the magnitude of the elastic force. In use, the copper wire is conveyed on the two conveying rollers 501 and the pressure roller 502. The elastic force provided by the spring 505 to the pressure roller 502 can deform the copper wire between the two conveying rollers 501 into a U-shape and continuously convey it. When tension is generated between the copper wire and the external wire reel, the tension acts on the pressure roller 502 and pushes the pressure roller 502 to move. The spring 505 undergoes elastic deformation. The pressure gauge 504 can detect the elastic force value of the spring 505. The external controller controls the lead screw 307 to rotate and adjusts the position of the push structures 300 on both sides according to the detected value.

[0046] In some embodiments, to improve the response speed, the displacement of the pressure wheel 502 can be used to transmit power to the lead screw 307 through the transmission structure, thereby driving the side push structure 300 to move.

[0047] Furthermore, such as Figures 7 to 10 As shown, the conveying structure 200 includes a movable platform 201 and a feed roller 202 and an auxiliary roller 203 rotatably disposed within the movable platform 201. The feed roller 202 is provided with a feed groove 204. The movable platform 201 is provided with a drive motor 205 that provides rotational power to the feed roller 202. The brush 402 is mounted on the movable platform 201 and electrically connected to the drive motor 205.

[0048] Copper wire is wound inside the wire feeding trough 204. The traction force of the copper wire keeps it in close contact with the inner wall of the wire feeding trough 204, increasing the friction between the copper wire and the wire feeding roller 202. At the same time, the auxiliary roller 203 can provide extrusion force to the copper wire, further increasing the friction between the wire feeding roller 202 and the copper wire. The drive motor 205 can provide rotational power to the wire feeding roller 202, so that the wire feeding roller 202 actively feeds the copper wire. When the traction force provided by the copper wire to the wire feeding roller 202 causes the moving table 201 to slide in the wire feeding channel 100, the moving table 201 synchronously drives the brush 402 to move on the resistance plate 401, thereby adjusting the current inside the drive motor 205 and adjusting the rotation speed of the wire feeding roller 202 and the copper wire feeding speed. The connecting arm 303 can be fixed on the moving table 201.

[0049] Furthermore, such as Figures 9 to 12As shown, the inner walls of opposite sides of the cable tray 204 are both arc-shaped. A partition ring 206 is provided in the middle of the cable tray 204. The partition ring 206 is fixed relative to the moving platform 201. A wire notch 207 is provided on the partition ring 206. The copper wire in the cable tray 204 passes through the wire notch 207 from one side of the partition ring 206 and is transported to the other side of the partition ring 206. Several side rolling bodies 208 are rotatably provided on both sides of the partition ring 206.

[0050] The two arc-shaped sidewalls inside the wire feeding trough 204 can form a surface contact pattern with the outer wall of the copper wire, thereby increasing the contact area, improving the synchronization of the movement of the copper wire and the wire feeding roller 202, and preventing slippage. The copper wire is wound once inside the wire feeding trough 204. In order to prevent the copper wire input side and output side on the wire feeding roller 202 from contacting each other and generating friction, a separator ring 206 can be set inside the wire feeding trough 204 to separate the copper wire. Specifically, when the copper wire is fed into the wire feeding trough 204, the copper wire is located on one side of the separator ring 206 and is separated from the wire feeding roller 202. Between the arc-shaped inner wall of the wire groove 204, as the wire feeding roller 202 rotates, this part of the copper wire gradually moves to the position of the wire opening 207. The copper wire passes through the wire opening 207 and moves to the other side of the separator ring 206 between the other arc-shaped inner wall of the wire feeding groove 204. The wire feeding roller 202 continues to rotate and outputs this part of the copper wire horizontally, thereby realizing the normal winding and conveying of the copper wire on the wire feeding roller 202. Several side rolling elements 208 on the separator ring 206 can reduce the frictional force when the copper wire moves relative to the separator ring 206.

[0051] Since the copper wires on both sides of the separator ring 206 only correspond to a portion of the sidewall of the separator ring 206, it is sufficient to set only a few side rolling elements 208 in a portion of the sidewall of the separator ring 206, as shown in the figure below. Figure 11 and Figure 12 As shown.

[0052] Furthermore, such as Figure 8 As shown, the auxiliary roller 203 includes a core column 209 located on the inner side and an elastic sleeve 210 located on the outer side. The core column 209 and the elastic sleeve 210 are connected by a plurality of elastic supports 211.

[0053] The core column 209 can provide elastic support for the elastic sleeve 210 through the elastic bracket 211, so that the elastic sleeve 210 can generate elastic deformation when extruding copper wire, thereby increasing the contact area between the auxiliary roller 203 and the copper wire.

[0054] The flexible support 211 can be adopted as follows Figure 8 The multi-branched shape shown can also be achieved by directly connecting the core post 209 and the elastic sleeve 210 with multiple elastic single pieces, or by using other structures that can provide stable elastic support for the elastic sleeve 210.

[0055] Since the feed roller 202 and the auxiliary roller 203 rotate in opposite directions, the feed roller 202 can be connected to the rotor of the drive motor 205, and the auxiliary roller 203 can be connected to the stator of the drive motor 205 through a gear structure. Thus, based on the synchronous relative motion of the rotor and stator in the drive motor 205, a drive mode in which the feed roller 202 and the auxiliary roller 203 provide dual power can be realized.

[0056] A method for controlling constant tension in ultrafine copper wire drawing includes the following steps: The copper wire is passed through the conveying structure 200 within the transmission channel 100; When the copper wire is drawn, the copper wire pulls the conveying structure 200 to move within the conveying channel 100, the brush 402 slides on the resistance plate 401, the current within the conveying structure 200 increases, and the copper wire conveying speed increases. The side-push structure 300 provides constant resistance to the movement of the conveying structure 200 through the conductive plate 306; When the speed at which the copper wire is conveyed by the conveying structure 200 is balanced with the traction speed of the copper wire, the copper wire is conveyed smoothly under the specified tension.

[0057] This method eliminates the indirect control link of traditional detection, feedback, calculation and adjustment. It directly uses the tension change of the copper wire itself to drive the movement of the conveying structure 200, and then changes the circuit resistance in real time to adjust the wire feeding speed. This direct linkage between mechanical and electrical eliminates the time for signal conversion and controller calculation, and can perfectly meet the requirements of high-speed wire drawing process for instantaneous tension control.

[0058] It should be noted that the above method is mainly based on the constant tension control mode. In a working mode where the two-sided push structure 300 and the conveying structure 200 can provide variable tension magnitude and variable tension direction, the constant tension control method may include the following steps: The copper wire is passed through the conveying structure 200 within the transmission channel 100; When the copper wire is drawn, the copper wire pulls the conveying structure 200 to move within the conveying channel 100, the brush 402 slides on the resistance plate 401, the current within the conveying structure 200 increases, and the copper wire conveying speed increases. The movement of the conveying structure 200 synchronously drives the conductive plate 306 to move. The overlap area between the conductive plate 306 and one fixed groove 301 increases, and the overlap area between the conductive plate 306 and another fixed groove 301 decreases. The number of miniature electromagnets 302 connected to the circuit on the fixed groove 301 changes. The combined force provided by the two-sided pushing structure 300 to the conductive plate 306 serves as the moving resistance of the conveying structure 200.

[0059] When the speed at which the copper wire is conveyed by the conveying structure 200 is balanced with the traction speed of the copper wire, the copper wire is conveyed smoothly under the specified tension.

[0060] As the external coil continues to release copper wire, the force required to rotate the traction coil increases, and the tension of the copper wire between the conveying structure 200 and the coil increases. The detection structure 500 detects this tension value and drives the push structures 300 on both sides to move through the lead screw 307, thereby changing the magnitude and direction of the force provided by the push structures 300 on both sides to the conveying structure 200, so that the tension of the copper wire on both sides of the conveying structure 200 remains constant.

[0061] Although this application has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made thereto without departing from the spirit and scope of this application. Accordingly, this specification and drawings are merely exemplary illustrations of the application as defined herein, and are to be considered as covering any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from its scope. Thus, if such modifications and modifications fall within the scope of this application and its equivalents, this application intends to include such modifications and modifications.

Claims

1. A constant tension control device for drawing ultra-fine copper wire, characterized in that, The device includes a wire feeding channel for copper wires to pass through, a feeding structure disposed within the wire feeding channel and slidably disposed along the copper wire feeding direction, a side-pushing structure for providing moving resistance to the feeding structure, and a conductive structure. The feeding structure is used to feed copper wires, and the conductive structure is used to control the speed at which the feeding structure feeds copper wires. The conductive structure includes a resistance plate disposed in the transmission channel along the copper wire transmission direction and a brush slidably disposed on the resistance plate. Along the copper wire transmission direction, one end of the resistance plate is connected to an external circuit, and the brush is mounted on the transmission structure. The transmission structure, the brush, and the resistance plate are electrically connected in sequence.

2. The ultra-fine copper wire drawing constant tension control device according to claim 1, characterized in that, The side-pushing structure includes a fixed groove disposed in the transmission channel and a connecting arm disposed on the transmission structure. A plurality of miniature electromagnets are disposed in the fixed groove, and the plurality of miniature electromagnets are arranged in multiple rows, with each row arranged along the copper wire transmission direction. The miniature electromagnets in adjacent rows are staggered. A plurality of permanent magnets are disposed on the connecting arm, and the permanent magnets are used in conjunction with each row of the plurality of miniature electromagnets.

3. The constant tension control device for ultra-fine copper wire drawing according to claim 2, characterized in that, Two conductive strips are arranged opposite each other on the fixed groove. Each conductive strip is composed of a number of contacts arranged along the copper wire conveying direction. The two corresponding contacts on the two conductive strips are electrically connected to the two ends of the miniature electromagnet, respectively. Two conductive plates are arranged opposite each other on the connecting arm. The conductive plates are slidably disposed on the fixed groove, and the conductive plates are electrically connected to several contacts in the corresponding area of ​​the conductive strip. The two conductive plates are connected to an external circuit, and the conductive plates move within the area where the fixed groove is located.

4. The ultra-fine copper wire drawing constant tension control device according to claim 2, characterized in that, A conductive strip is provided on the fixed groove. The conductive strip is composed of a plurality of contacts arranged along the copper wire conveying direction. The contacts are electrically connected to one end of the corresponding miniature electromagnet, and the other end of the plurality of miniature electromagnets is connected to an external circuit. A conductive plate is provided on the connecting arm. The conductive plate is slidably disposed on the fixed groove, and a portion of the conductive plate overlaps with a portion of the conductive strip. The conductive plate is electrically connected to several contacts on the conductive strip in the overlapping area, and the conductive plate is connected to an external circuit.

5. The ultra-fine copper wire drawing constant tension control device according to claim 4, characterized in that, The control device also includes a detection structure for detecting the tension of the copper wires conveyed to the conveying structure; Two side-push structures are provided, and the two side-push structures are connected together along the copper wire conveying direction. The conductive plate is located between the two side-push structures, and the two side-push structures provide the conductive plate with opposite forces. When the detection structure detects changes in copper wire tension, the two side-push structures are driven by a lead screw to move along the copper wire conveying direction within the wire conveying channel.

6. The ultra-fine copper wire drawing constant tension control device according to claim 5, characterized in that, The detection structure includes two conveying wheels arranged opposite each other along the copper wire conveying direction and a pressing wheel located between the two conveying wheels. The pressing wheel and the conveying wheels are offset in the vertical plane. The pressing wheel is provided with elastic support by a spring, and the spring force value is detected by a pressure gauge.

7. The ultra-fine copper wire drawing constant tension control device according to claim 1, characterized in that, The conveying structure includes a movable platform and a feed roller and an auxiliary roller rotatably disposed within the movable platform. The feed roller has a feed groove. A drive motor that provides rotational power to the feed roller is disposed on the movable platform. The brush is mounted on the movable platform and electrically connected to the drive motor.

8. The ultra-fine copper wire drawing constant tension control device according to claim 7, characterized in that, The inner walls of opposite sides of the cable tray are both arc-shaped. A partition ring is provided in the middle of the cable tray. The partition ring is fixed relative to the moving platform. A wire notch is provided on the partition ring. The copper wire in the cable tray passes through the wire notch from one side of the partition ring and is transported to the other side of the partition ring. Several side rolling bodies are rotatably provided on both sides of the partition ring.

9. The ultra-fine copper wire drawing constant tension control device according to claim 7, characterized in that, The auxiliary roller includes an inner core and an outer elastic sleeve, and the core and the elastic sleeve are connected by several elastic supports.

10. A method for controlling constant tension in ultra-fine copper wire drawing, comprising using an ultra-fine copper wire drawing constant tension control device as described in any one of claims 1-9, characterized in that, Includes the following steps: Passing copper wires through the conveying structure within the transmission channel; When the copper wire is drawn, the copper wire pulls the conveying structure to move within the conveying channel, the brush slides on the resistance plate, the current in the conveying structure increases, and the copper wire conveying speed increases. The side-push structure provides constant resistance to the movement of the conveying structure through a conductive plate; When the speed at which the copper wire is conveyed by the conveying structure is balanced with the traction speed of the copper wire, the copper wire is conveyed smoothly under the specified tension.

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