A dynamic centering device before drawing ultrafine copper wire

Abstract

This invention relates to the field of copper wire forming equipment technology, specifically to a dynamic centering device for drawing ultra-fine copper wire, comprising a detection component and a centering component. The detection component is used to detect the coincidence of the central axis of the copper wire with the central axis of the drawing die hole. The centering component includes a drive component, a planetary mechanism, a connecting shaft, and a centering wheel. The planetary mechanism includes a sun gear, multiple planet gears, and a gear ring. The connecting shaft is coaxially connected to the planet gears, and the centering wheel is coaxially connected to the connecting shaft. The sum of the maximum outer diameter of the centering wheel and the radius of the copper wire before drawing is equal to the vertical distance from the central axis of the planet gear to the central axis of the sun gear. When the copper wire deviates from the central axis to one side, the centering wheel rotates to the eccentric side on its revolution trajectory, and its working surface contacts and radially presses against the outer surface of the copper wire. The radial pressure generated by this contact forces the copper wire to move towards the central axis of the die hole, thereby correcting the copper wire to a position precisely coincident with the die hole axis in real time and dynamically.

Description

Technical Field

[0001] This invention relates to the field of copper wire forming equipment technology, specifically to a dynamic centering device for drawing ultra-fine copper wire. Background Technology

[0002] Ultrafine copper wire, typically referring to high-purity oxygen-free copper wire with a diameter ≤0.05mm, is widely used in high-tech fields such as microelectronic bonding wires and precision medical device leads. Before entering the final drawing die, the diameter of the ultrafine copper wire has been reduced to an extremely fine scale due to the preceding multiple drawing processes, significantly reducing its stiffness. If the copper wire does not enter strictly along the central axis (axial direction) of the drawing die hole, uneven stress will occur due to the deviation between the copper wire and the edge of the die hole. In the production of ultrafine copper wire, the path deviation generated when the copper wire passes through the preceding guide roller assembly and tension mechanism is geometrically amplified at the ultrafine scale. Furthermore, the mechanical vibration and tension fluctuations of the copper wire during the operation of the drawing equipment will cause the ultrafine wire to oscillate at high frequency and amplitude. Therefore, it is difficult for the ultrafine copper wire to maintain a straight position, and it is very easy to become skewed.

[0003] This skewed state will cause the following serious problems: (1) Surface damage: The surface of the copper wire is easily scratched by the edge of the die hole, affecting the surface finish of the product. (2) Uneven drawing: The cross-section of the copper wire is subjected to asymmetrical force, resulting in uneven drawing deformation. (3) Stress concentration and fracture: In particular, the copper wire forms a contact angle with the edge of the die hole in the eccentric state, causing local stress concentration, which can easily lead to the fracture of cable-grade ultra-fine copper wire. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a dynamic centering device for drawing ultra-fine copper wires, which overcomes the deficiencies of existing technologies. It has a reasonable design and compact structure, and solves the problem that existing technologies cannot guarantee that the copper wire enters the die hole strictly along the central axis of the drawing die hole.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] This invention proposes a dynamic centering device for drawing ultra-fine copper wire, including a detection component and a centering component disposed on the front side of the inlet end of the drawing die;

[0009] The detection component is used to detect the degree of coincidence between the central axis of the copper wire and the central axis of the drawing die hole;

[0010] The centering assembly includes a driving component, a planetary mechanism, a connecting shaft, and a centering wheel. The planetary mechanism includes a sun gear, multiple planet gears, and a gear ring. The central axis of the sun gear coincides with the central axis of the wire drawing die hole. The sun gear has a through hole along its axial direction that allows the copper wire to pass through. The driving component drives the sun gear to rotate. Multiple planet gears are interleaved and meshed between the sun gear and the gear ring. The connecting shaft is coaxially connected to the planet gears, and the centering wheel is coaxially connected to the connecting shaft.

[0011] The sum of the maximum outer diameter of the centering wheel and the radius of the copper wire before drawing is equal to the vertical distance from the central axis of the planetary gear to the central axis of the sun gear.

[0012] Preferably, the planetary gear has a threaded hole at the center of its end face, the connecting shaft has external threads at both ends, one end of which is threaded to the threaded hole and the other end is threaded to a threaded sleeve, the connecting shaft is provided with a limit ring, the connecting shaft is a smooth shaft section between the external threads of the limit ring and the threaded sleeve, the centering wheel has a through hole at the center of its end face, the smooth shaft section passes through the through hole, so that the centering wheel rotates and is sleeved on the smooth shaft section.

[0013] Preferably, the two sides of the gear ring are connected to a limiting ring by a plurality of bolts evenly distributed in the circumferential direction. The inner diameter of the limiting ring is smaller than the inner diameter of the gear ring, and the edge of the limiting ring blocks the two sides of the planetary gear to restrict the axial movement of the planetary gear.

[0014] Preferably, the device further includes a bracket, and the driving component includes a motor fixedly connected to the bracket and a drive gear coaxially fixedly connected to the output end of the motor. One end of the sun gear extends out of the gear ring and meshes with the drive gear.

[0015] Preferably, a retainer is also fixedly connected to the bracket. The retainer includes two independent ring bodies that can clamp onto both sides of the gear ring to fix the gear ring. One of the independent ring bodies has arc-shaped strips on both sides. The inner wall of the arc-shaped strips fits against the outer wall of the gear ring. The surface of the arc-shaped strips and the surface of the other independent ring body have coaxial screw holes. The two independent ring bodies are connected by bolts that are threaded to the screw holes.

[0016] Preferably, the end of the centering wheel away from the planetary gear extends into a tapered section with a gradually decreasing outer diameter to form a guide surface that converges towards the die hole. The angle between the outer wall surface of the tapered section and its central axis does not exceed 15°, and the edge of the tapered section is provided with an arc-shaped chamfer.

[0017] Preferably, the detection assembly includes a mounting plate and a detection ring connected to the mounting plate, wherein the central axis of the detection ring coincides with the central axis of the sun gear; multiple photoelectric emitters and multiple photoelectric receivers are connected around the inner wall of the detection ring in a circumferential direction, and the detection ring is provided with signal connectors that are electrically connected to the photoelectric emitters and photoelectric receivers; the photoelectric emitters and photoelectric receivers are in one-to-one correspondence, and when the copper wire deviates from the central axis, the light emitted by the photoelectric emitter passes through the central area of ​​the detection ring and is received by the corresponding photoelectric receiver.

[0018] Preferably, the detection ring is bounded by a virtual line that passes perpendicularly through the central axis of the detection ring, with all photoelectric emitters distributed on one side of the virtual line and all photoelectric receivers distributed on the other side of the virtual line; the photoelectric emitters and photoelectric receivers are evenly spaced.

[0019] (III) Beneficial Effects

[0020] This invention provides a dynamic centering device for ultrafine copper wire before drawing. It offers the following advantages:

[0021] 1. In this invention, when the copper wire deviates from the central axis to one side, the centering wheel rotates to the eccentric side on its revolution trajectory. Its working surface will contact and radially press against the outer surface of the copper wire. The radial pressure generated by this contact forces the copper wire to move towards the central axis of the die hole, thereby correcting the copper wire to a position that precisely coincides with the axis of the die hole in real time and dynamically. This ensures that the copper wire always enters the die hole with the minimum eccentricity (ideally zero eccentricity), avoiding the scraping between the copper wire and the edge of the die hole caused by eccentricity. The axial introduction of the copper wire makes the drawing force act symmetrically on the entire cross section, significantly improving the uniformity of deformation. It also fundamentally eliminates the stress concentration phenomenon caused by non-axial entry into the die, greatly reducing the risk of breakage of ultra-fine copper wire during the drawing process, and improving production efficiency and product yield.

[0022] 2. In this invention, the centering wheel has a conical surface and an arc-shaped chamfer design. The conical surface guides the generation of a gentle radial force, and the arc-shaped chamfer changes the line contact to a surface contact, reducing contact stress and preventing damage to the copper wire grain boundaries and the generation of microcracks during the correction process.

[0023] 3. The detection component forms a photoelectric detection array in the circumferential direction, providing real-time feedback of the offset signal. The controller drives the centering wheel to apply force precisely, and it automatically stops after the offset returns to zero, forming a closed-loop control. Under ideal alignment, the centering wheel achieves frictionless guidance of the copper wire, applying the necessary corrective force only when offset is detected, combining high efficiency and protection. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention;

[0025] Figure 2A schematic diagram of the centering component;

[0026] Figure 3 for Figure 2 A schematic diagram of the explosive decomposition;

[0027] Figure 4 for Figure 1 The right view;

[0028] Figure 5 for Figure 4 Right view of the copper wire's position offset from the perspective;

[0029] Figure 6 This is a structural schematic diagram of the support and detection components;

[0030] Figure 7 A schematic diagram of the structure of an independent ring;

[0031] Figure 8 This is a schematic diagram of the centering wheel.

[0032] In the diagram: 1. Detection component; 11. Mounting plate; 12. Detection ring; 13. Photoelectric transmitter; 14. Photoelectric receiver; 15. Signal connector; 2. Centering component; 21. Drive component; 211. Motor; 212. Drive gear; 22. Planetary mechanism; 221. Sun gear; 2211. Through hole; 222. Planetary gear; 2221. Threaded hole; 223. Gear ring; 224. Limiting ring; 225. Cage; 2251. Independent ring body; 2252. Arc strip; 23. Connecting shaft; 231. Limiting ring; 232. Optical shaft section; 24. Centering wheel; 241. Conical section; 242. Arc chamfer; 243. Insertion hole; 25. Screw sleeve; 3. Bracket; 4. Wire drawing die; 5. Copper wire. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] See attached document Figures 1-8This invention proposes a dynamic centering device for ultra-fine copper wire 5 before drawing. Before the copper wire 5 enters the die hole, the device detects and dynamically adjusts the spatial position of the copper wire 5 in real time to ensure that its central axis is strictly coincident (concentric) with the central axis of the die hole of the drawing die 4, thereby achieving precise axial introduction of the copper wire 5. It includes a detection component 1 and a centering component 2 disposed on the front side of the inlet end of the drawing die 4. The detection component 1 is used to detect the degree of coincidence (i.e., eccentricity) between the central axis of the copper wire 5 and the central axis of the die hole of the drawing die 4. The centering component 2 is used to dynamically adjust the position of the copper wire 5 according to the detection signal or a preset mechanism to achieve active centering.

[0035] The centering assembly 2 includes a driving component 21, a planetary mechanism 22, a connecting shaft 23, and a centering wheel 24. The planetary mechanism 22 includes a sun gear 221, multiple planetary gears 222, and a gear ring 223. The central axis of the sun gear 221 coincides with the central axis of the die hole in the wire drawing die 4. The sun gear 221 has a through hole 2211 along its axial direction, allowing the copper wire 5 to pass through. The multiple planetary gears 222 are interlocked and connected between the sun gear 221 and the gear ring 223. The connecting shaft 23 is coaxially connected to the planetary gears 222, and the centering wheel 24 is coaxially connected to the connecting shaft 23. The driving component 21 drives the sun gear 221 to rotate, which in turn drives the planetary gears 222 to rotate. The planetary gears 222 then drive the centering wheel 24 to rotate around the central axis of the sun gear 221. (See also...) Figure 4 The sum of the maximum outer diameter R2 of the centering wheel 24 and the radius R1 of the copper wire 5 before drawing is equal to the vertical distance D from the central axis of the planetary gear 222 to the central axis of the sun gear 221.

[0036] Therefore, when the copper wire 5 travels precisely along the axis of the die hole, the centering wheel 24, during its revolution, maintains non-pressure contact and no interference between its maximum diameter working surface and the surface of the copper wire 5, serving only a guiding function and not applying a corrective force. Figure 5 As shown, when the copper wire 5 deviates from the central axis to one side, the centering wheel 24 rotates to the eccentric side on its revolution trajectory. Its working surface contacts and radially presses against the outer surface of the copper wire 5. The radial pressure generated by this contact forces the copper wire 5 to move towards the central axis, thereby correcting the copper wire 5 to a position precisely aligned with the die hole axis in real time and dynamically. The technical solution of this invention can continuously scan the centering wheel 24 driven by the planetary mechanism 22 to apply a precise radial correction force based on the real-time detection of the copper wire 5's deviation. This ensures that the copper wire 5 always enters the die hole with minimal eccentricity (ideally zero eccentricity), avoiding the scraping between the copper wire 5 and the die hole edge caused by eccentricity. It also allows the copper wire 5 to be axially guided, so that the drawing force acts symmetrically on the entire cross section, significantly improving the uniformity of deformation and fundamentally eliminating the stress concentration phenomenon caused by non-axial entry into the die. This greatly reduces the risk of breakage of the ultra-fine copper wire 5 during the drawing process, improving production efficiency and product yield.

[0037] In some embodiments of the present invention, a threaded hole 2221 is provided at the center of the end face of the planetary gear 222. Both ends of the connecting shaft 23 are provided with external threads, one end of which is threadedly connected to the threaded hole 2221 and the other end is threadedly connected to a threaded sleeve 25. A limiting ring 231 is provided on the connecting shaft 23. The connecting shaft 23 is a smooth shaft section 232 between the external threads of the limiting ring 231 and the threaded sleeve 25. A insertion hole 243 is provided through the center of the end face of the centering wheel 24. The smooth shaft section 232 passes through the insertion hole 243 of the centering wheel 24, so that the centering wheel 24 is rotatably sleeved on the smooth shaft section 232. By tightening the threaded sleeve 25 against the outer end face of the centering wheel 24, it works together with the limiting ring 231 to axially position and constrain the centering wheel 24 on the smooth shaft section 232, while allowing the centering wheel 24 to rotate freely around the smooth shaft section 232. The centering wheel 24 not only revolves with the planetary gear 222, but also rotates freely around its own axis (i.e., the axis of the connecting shaft 23) on the optical axis section 232. While performing dynamic centering during its revolution, the rotation of the centering wheel 24 continuously changes its contact area with the surface of the ultrafine copper wire 5. When the outer wall of the centering wheel 24 comes into contact with the copper wire 5 due to friction, the rotation causes this contact area to constantly change, effectively preventing excessive localized wear on the working surface of the centering wheel 24 caused by prolonged fixed contact with the copper wire 5 at the same position. Through uniform wear distribution, the service life of the centering wheel 24 is significantly extended, and the working surface profile (especially the maximum working radius R2) of the centering wheel 24 remains stable throughout its service life, thus maintaining the device's high-precision dynamic centering capability for a long time.

[0038] To ensure the stability and reliability of the planetary gear mechanism under high-speed operation, this embodiment designs a precise axial limiting structure on both sides of the gear ring 223. The two sides of the gear ring 223 are connected to limiting rings 224 by multiple bolts evenly distributed in the circumferential direction. The inner diameter of the limiting rings 224 is smaller than the inner diameter of the gear ring 223 to form an axial blocking surface on both end faces of the planetary gears 222. The edges of the limiting rings 224 block both sides of the planetary gears 222 to restrict the axial movement of the planetary gears 222, improve the rigidity and stability of the transmission system, prevent the planetary gears 222 from shifting under axial force, and prevent them from accidentally contacting or interfering with adjacent components.

[0039] In this embodiment, a bracket 3 is also included. The driving component 21 includes a motor 211 fixedly connected to the bracket 3 and a driving gear 212 coaxially fixedly connected to the output end of the motor 211. One end of the sun gear 221 extends out of the gear ring 223 and meshes with the driving gear 212. The motor 211 drives the driving gear 212 to rotate, and the driving gear 212 drives the sun gear 221 to rotate. The planetary mechanism 22 drives the connecting shaft 23 and the centering wheel 24 to rotate. Alternatively, the driving component 21 can be a drive pulley driven by the motor 211. The shaft of the sun gear 221 extends out of the gear ring 223 and is fixedly connected to a driven pulley. The rotation of the sun gear 221 is achieved by a belt wound around the drive pulley and the driven pulley. The motor 211 is a servo motor 211 or frequency converter controlled, which can achieve precise adjustment of the revolution speed of the centering wheel 24 to adapt to the process requirements of different wire diameters and different drawing speeds.

[0040] Preferably, a retainer 225 is also fixedly connected to the bracket 3. The retainer 225 includes two independent ring bodies 2251 that can clamp onto both sides of the gear ring 223 to fix the gear ring 223. One of the independent ring bodies 2251 has arc-shaped strips 2252 on both sides. The inner wall of the arc-shaped strips 2252 fits against the outer wall of the gear ring 223. The surface of the arc-shaped strips 2252 and the surface of the other independent ring body 2251 have coaxial threaded holes. The two independent ring bodies 2251 are connected by bolts threaded into the threaded holes. The curved surface fit design of the arc-shaped strips 2252 and the outer wall of the gear ring 223 eliminates assembly gaps and ensures the coaxiality of the central axis of the gear ring 223 and the axis of the sun gear 221. The clamping structure of the two independent ring bodies 2251 simultaneously restricts the axial displacement and radial vibration of the gear ring 223, improving the installation accuracy and operational stability of the gear ring 223.

[0041] The centering wheel 24 extends from the end away from the planetary gear 222 into a tapered section 241 with a gradually narrowing outer diameter to form a guide surface that converges towards the die hole. The angle between the outer wall surface of the tapered section 241 and its central axis does not exceed 15°. The edge of the tapered section 241 is provided with an arc-shaped chamfer 242, and the radius of curvature R of the arc-shaped chamfer 242 is ≥0.1mm. When the offset copper wire 5 contacts the tapered surface, the tapered surface forms a gentle radial correction force on the copper wire 5, causing the copper wire 5 to slide along the tapered surface towards the central axis. The arc-shaped chamfer 242 expands the initial contact point of the copper wire 5 from line contact to surface contact, reducing contact stress and eliminating the risk of grain boundary slippage and microcracks in the copper wire 5 caused by edge stress concentration.

[0042] Figure 6The diagram illustrates the specific structure of one embodiment of the detection component 1. The detection component 1 includes a mounting plate 11 and a detection ring 12 connected to the mounting plate 11. The mounting plate 11 is fixedly connected to a bracket 3. The central axis of the detection ring 12 coincides with the central axis of the sun gear 221. Multiple photoelectric emitters 13 and multiple photoelectric receivers 14 are circumferentially connected to the inner wall of the detection ring 12. Signal connectors 15 are provided on the detection ring 12, electrically connected to the photoelectric emitters 13 and photoelectric receivers 14. The photoelectric emitters 13 and photoelectric receivers 14 are one-to-one, forming a ring array detection. An external controller is connected to the signal connectors 15. The photoelectric receivers 14 convert photocurrent into electrical signals and transmit them to the external controller. The controller analyzes which photoelectric receivers 14 are triggered to determine the direction and magnitude of the copper wire 5's offset. Simultaneously, the controller electrically connects to the motor 211 to control the start and stop of the drive unit 21. In an ideal alignment state, the copper wire 5 is precisely positioned on the central axis of the detection ring 12, completely blocking the beam path from all photoelectric transmitters 13 to the receivers, resulting in no light signal input from the photoelectric receivers 14. When the copper wire 5 deviates from the central axis, the beam path in the offset direction is no longer blocked by the copper wire, and the corresponding photoelectric receiver 14 receives the beam and generates an electrical signal. The photoelectric receiver 14 transmits the electrical signal to the external controller via the signal connector 15. The controller then instructs the motor 211 to drive the planetary mechanism 22, which applies a reverse corrective force to the copper wire 5 through the centering wheel 24. When the system detects that all photoelectric receivers 14 have no signal (indicating that the copper wire 5 has returned to its central position), the controller terminates the operation of the motor 211, thereby achieving closed-loop control for dynamic correction. In this invention, the centering wheel 24 achieves frictionless guidance of the copper wire 5 under ideal alignment, and applies the necessary corrective force only when a deviation is detected, thus combining high efficiency and protection.

[0043] Preferably, the detection ring 12 is bounded by a virtual line that passes perpendicularly through the central axis of the detection ring 12. All photoelectric transmitters 13 are distributed on one side of the virtual line, and all photoelectric receivers 14 are distributed on the other side of the virtual line. The photoelectric transmitters 13 and photoelectric receivers 14 are evenly spaced. Through physical isolation and spatial symmetry, the cross-interference of adjacent beams is effectively avoided, ensuring the uniqueness of the offset detection signal and the accuracy of direction identification.

[0044] In addition, the detection component 1 can also be four sets of tungsten carbide orientation probes arranged in a 90° ring along the path of the copper wire 5. The tail of the probe is connected to a piezoelectric ceramic force sensor. When the copper wire 5 is eccentric, it will press the corresponding orientation probe, causing the piezoelectric force signal to rise, thereby determining the direction of deviation.

[0045] In addition, the detection component 1 can also detect the offset of the copper wire 5 by capturing the movement trajectory of the copper wire 5 with a high-speed camera and calculating the center coordinate offset by a computer.

[0046] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0047] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dynamic centering device for ultra-fine copper wire before drawing, characterized in that: It includes a detection component (1) and a centering component (2) located on the front side of the wire drawing die inlet. The detection component (1) is used to detect the coincidence of the central axis of the copper wire with the central axis of the drawing die hole; The centering assembly (2) includes a drive component (21), a planetary mechanism (22), a connecting shaft (23), and a centering wheel (24). The planetary mechanism (22) includes a sun gear (221), multiple planetary gears (222), and a gear ring (223). The central axis of the sun gear (221) coincides with the central axis of the wire drawing die hole. The sun gear (221) has a through hole (2211) along the axial direction that allows copper wire to pass through. The drive component (21) drives the sun gear (221) to rotate. Multiple planetary gears (222) are interleaved and connected between the sun gear (221) and the gear ring (223). The connecting shaft (23) is coaxially connected to the planetary gears (222). The centering wheel (24) is coaxially connected to the connecting shaft (23). The sum of the maximum outer diameter of the centering wheel (24) and the radius of the copper wire before drawing is equal to the vertical distance from the central axis of the planetary gear (222) to the central axis of the sun gear (221).

2. The dynamic centering device before drawing ultrafine copper wire as described in claim 1, characterized in that: The planetary gear (222) has a threaded hole (2221) at the center of its end face. Both ends of the connecting shaft (23) have external threads, with one end threaded to the threaded hole (2221) and the other end threaded to a threaded sleeve (25). A limit ring (231) is provided on the connecting shaft (23). The connecting shaft (23) has a smooth shaft section (232) between the external threads of the limit ring (231) and the threaded sleeve (25). The centering wheel (24) has a through hole (243) at the center of its end face. The smooth shaft section (232) passes through the through hole (243), allowing the centering wheel (24) to rotate and be fitted onto the smooth shaft section (232).

3. The dynamic centering device before drawing ultrafine copper wire as described in claim 1, characterized in that: The gear ring (223) is connected to the two sides by a plurality of bolts evenly distributed in the circumferential direction by a limiting ring (224). The inner diameter of the limiting ring (224) is smaller than the inner diameter of the gear ring (223). The edge of the limiting ring (224) blocks the two sides of the planetary gear (222) to restrict the axial movement of the planetary gear (222).

4. The dynamic centering device before drawing ultrafine copper wire as described in claim 2, characterized in that: It also includes a bracket (3), and the drive component (21) includes a motor (211) fixedly connected to the bracket (3) and a drive gear (212) coaxially fixedly connected to the output end of the motor (211). One end of the sun gear (221) extends out of the gear ring (223) and meshes with the drive gear (212).

5. The dynamic centering device before drawing ultrafine copper wire as described in claim 4, characterized in that: A retainer (225) is also fixedly connected to the bracket (3). The retainer (225) includes two independent ring bodies (2251) that can be clamped on both sides of the gear ring (223) to fix the gear ring (223). One of the independent ring bodies (2251) has arc-shaped strips (2252) on both sides. The inner wall of the arc-shaped strips (2252) fits against the outer wall of the gear ring (223). The surface of the arc-shaped strips (2252) and the surface of the other independent ring body (2251) have coaxial screw holes. The two independent ring bodies (2251) are connected by bolts that are threaded to the screw holes.

6. The dynamic centering device before drawing ultrafine copper wire as described in claim 1, characterized in that: The end of the centering wheel (24) away from the planetary wheel (222) extends into a tapered section (241) with a gradually decreasing outer diameter to form a guide surface that converges toward the die hole. The angle between the outer wall surface of the tapered section (241) and its central axis does not exceed 15°, and the edge of the tapered section (241) is provided with an arc-shaped chamfer (242).

7. A dynamic centering device for ultrafine copper wire before drawing, as described in any one of claims 1-6, characterized in that: The detection component (1) includes a mounting plate (11) and a detection ring (12) connected to the mounting plate (11). The central axis of the detection ring (12) coincides with the central axis of the sun gear (221). Multiple photoelectric emitters (13) and multiple photoelectric receivers (14) are connected around the inner wall of the detection ring (12). The detection ring (12) is provided with a signal connector (15) that is electrically connected to the photoelectric emitters (13) and the photoelectric receivers (14). The photoelectric emitters (13) and the photoelectric receivers (14) correspond one-to-one. When the copper wire deviates from the central axis, the light emitted by the photoelectric emitter (13) passes through the central area of ​​the detection ring (12) and is received by the corresponding photoelectric receiver (14).

8. The dynamic centering device before drawing ultrafine copper wire as described in claim 7, characterized in that: The detection ring (12) is bounded by a virtual line that passes vertically through the central axis of the detection ring (12). All photoelectric transmitters (13) are distributed on one side of the virtual line, and all photoelectric receivers (14) are distributed on the other side of the virtual line. The photoelectric transmitters (13) and photoelectric receivers (14) are evenly spaced.

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