Dynamic centering device used before superfine copper wire drawing

Abstract

The invention relates to the technical field of copper wire forming equipment, in particular to a dynamic centering device for superfine copper wires before drawing, which comprises a detection assembly and a centering assembly, the detection assembly is used for detecting the coincidence degree of the copper wire central axis and the wire-drawing die hole central axis. The centering assembly comprises a driving part, a planetary mechanism, a connecting shaft and a centering wheel, the planetary mechanism comprises a sun wheel, a plurality of planetary wheels and a gear ring, the connecting shaft is coaxially connected to the planetary wheels, 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 a copper wire before wire drawing is equal to the vertical distance from the central axis of the planet wheel to the central axis of the sun wheel, when the copper wire deviates from the central axis towards one side, the centering wheel rotates to the eccentric side on the revolution track, and the working surface of the centering wheel makes contact with and radially abuts against the outer surface of the copper wire; the radial pressure generated by the contact forces the copper wire to move towards the central axis of the die hole, so that the copper wire is dynamically corrected to the position accurately coincident with the axis of the die hole in real time.

Description

Technical Field

[0001] The present invention relates to the technical field of copper wire forming equipment, and particularly relates to a dynamic centering device before drawing of ultra-fine copper wire. Background Art

[0002] Ultra-fine copper wire, usually referring to high-purity oxygen-free copper wire with a diameter ≤ 0.05 mm, is widely used in high-tech fields such as microelectronic bonding wires and conductors of precision medical devices. Before the ultra-fine copper wire enters the die hole of the final forming drawing die, due to the previous multi-pass drawing process that has reduced the diameter of the copper wire to an extremely fine scale, its own stiffness is significantly reduced. If the copper wire fails to enter strictly along the central axis (axial direction) of the drawing die hole, it will cause uneven stress on the copper wire and the edge of the die hole due to skewing. In the production of ultra-fine copper wire, the path deviation generated when the copper wire passes through the previous guide wheel group and tension mechanism is geometrically amplified at the ultra-fine scale, and the mechanical vibration and copper wire tension fluctuation during the operation of the drawing equipment will cause the ultra-fine wire to swing at high frequency with small amplitude. Therefore, it is difficult for the ultra-fine copper wire to maintain a straight position and is extremely prone to skewing.

[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 stress on the cross-section of the copper wire is asymmetric, resulting in uneven drawing deformation. (3) Stress concentration and fracture: Particularly crucial is that in the eccentric state, the copper wire and the edge of the die hole form a contact angle, causing local stress concentration and extremely prone to the fracture of the cable-grade ultra-fine copper wire. Summary of the Invention

[0004] (I) Technical Problems to be Solved

[0005] In view of the deficiencies of the prior art, the present invention provides a dynamic centering device before drawing of ultra-fine copper wire, which overcomes the deficiencies of the prior art, is reasonably designed, has a compact structure, and solves the problem that the existing technology cannot ensure that the copper wire enters the die hole strictly along the central axis of the drawing die hole.

[0006] (II) Technical Solutions

[0007] To achieve the above objectives, the present invention is realized through the following technical solutions:

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

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

[0010] The centering assembly includes a driving member, a planetary mechanism, a connecting shaft, and a centering wheel. The planetary mechanism includes a sun gear, a plurality of planet gears, and a ring gear. The central axis of the sun gear coincides with the central axis of the die hole of the wire drawing die. A through hole through which the copper wire can pass is axially provided in the sun gear. The driving member drives the sun gear to rotate. The plurality of planet gears are meshed and connected between the sun gear and the ring gear at intervals. The connecting shaft is coaxially connected to the planet gear, 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 wire drawing is equal to the perpendicular distance from the central axis of the planet gear to the central axis of the sun gear.

[0012] Preferably, a threaded hole is provided at the center of the end face of the planet gear. External threads are provided at both ends of the connecting shaft, and one end thereof is threadedly connected to the threaded hole, and the other end is threadedly connected with a screw sleeve. A limiting ring is provided on the connecting shaft. The connecting shaft is a smooth shaft section between the external threads cooperated with the limiting ring and the screw sleeve. A jack is penetrated through the center of the end face of the centering wheel, and the smooth shaft section penetrates through the jack, so that the centering wheel is rotatably sleeved on the smooth shaft section.

[0013] Preferably, two limiting rings are connected to both sides of the ring gear through a plurality of bolts uniformly distributed in the circumferential direction. The inner diameter of the limiting ring is smaller than the inner diameter of the ring gear, and the edge of the limiting ring blocks both sides of the planet gear to limit the axial movement of the planet gear.

[0014] Preferably, it further includes a bracket. The driving member includes a motor fixedly connected to the bracket and a driving gear coaxially and fixedly connected to the output end of the motor. One end of the sun gear extends out of the ring gear and is meshed and connected with the driving gear.

[0015] Preferably, a cage is further fixedly connected to the bracket. The cage includes two independent ring bodies capable of clamping both sides of the ring gear to fix the ring gear. Arc-shaped strips are provided on both sides of one independent ring body. The inner wall of the arc-shaped strip fits with the outer wall of the ring gear. Coaxial screw holes are provided on the surface of the arc-shaped strip and the surface of the other independent ring body, and the two independent ring bodies are connected by bolts threadedly connected to the screw holes.

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

[0017] Preferably, the detection component includes a mounting plate and a detection ring connected to the mounting plate, and the central axis of the detection ring coincides with the central axis of the sun gear; a plurality of photoelectric emitters and a plurality of photoelectric receivers are equally connected around the inner wall of the detection ring in the circumferential direction, and a signal connector electrically connected to the photoelectric emitters and the photoelectric receivers is arranged on the detection ring; the photoelectric emitters and the photoelectric receivers correspond one by one. 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 perpendicular to the central axis of the detection ring. All the photoelectric emitters are distributed on one side of the virtual line, and all the photoelectric receivers are distributed on the other side of the virtual line; the photoelectric emitters are equally spaced from each other, and the photoelectric receivers are equally spaced from each other.

[0019] (III) Beneficial effects

[0020] The embodiment of the present invention provides a dynamic centering device for ultra-fine copper wire before wire drawing. It has the following beneficial effects:

[0021] 1. In the present invention, when the copper wire deviates from the central axis to one side, the centering wheel rotates to the eccentric side on the revolution track, and its working surface will contact and radially press 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 coinciding with the axis of the die hole in real time and dynamically, ensuring that the copper wire always enters the die hole with the minimum eccentricity (ideally zero eccentricity), avoiding the scratching of the copper wire and the edge of the die hole caused by eccentricity, making the axial introduction of the copper wire make the drawing force act symmetrically on the entire cross-section, significantly improving the deformation uniformity, and fundamentally eliminating the stress concentration phenomenon caused by non-axial entry into the die, greatly reducing the fracture risk of the ultra-fine copper wire during wire drawing, and improving the production efficiency and product yield.

[0022] 2. In the present invention, the centering wheel has a conical surface and an arc chamfer design. The conical surface guides to generate a soft radial force, and the arc chamfer changes the line contact into a surface contact, reducing the contact stress and preventing damage to the copper wire grain boundary and the generation of micro-cracks during the alignment process.

[0023] 3. The detection component forms a photoelectric detection array in the circumferential direction, and feeds back the offset signal in real time. The controller drives the centering wheel to apply force precisely, and automatically stops after the offset returns to zero, forming a closed-loop control; in the ideal centering state, the centering wheel realizes the frictionless guiding of the copper wire, and only applies the necessary correction force when detecting the offset, combining high efficiency and protection. Description of the drawings

[0024] Figure 1 It is a schematic structural diagram of the present invention;

[0025] Figure 2Schematic diagram of centering component;

[0026] Figure 3 is Figure 2 exploded decomposition schematic diagram of;

[0027] Figure 4 is Figure 1 right view of;

[0028] Figure 5 is Figure 4 right view of the copper wire position offset under the perspective of;

[0029] Figure 6 Schematic diagram of the structure of the bracket and the detection component;

[0030] Figure 7 Schematic diagram of the structure of the independent ring body;

[0031] Figure 8 Schematic diagram of the structure of the centering wheel;

[0032] In the figure: 1. Detection component; 11. Mounting plate; 12. Detection ring; 13. Photoelectric emitter; 14. Photoelectric receiving end; 15. Signal connector; 2. Centering component; 21. Driving part; 211. Motor; 212. Driving gear; 22. Planetary mechanism; 221. Sun gear; 2211. Through hole; 222. Planet gear; 2221. Threaded hole; 223. Ring gear; 224. Limiting ring; 225. Cage; 2251. Independent ring body; 2252. Arc-shaped strip; 23. Connecting shaft; 231. Limiting ring; 232. Optical axis section; 24. Centering wheel; 241. Taper section; 242. Arc chamfer; 243. Insertion hole; 25. Screwed sleeve; 3. Bracket; 4. Drawing die; 5. Copper wire. Specific implementation mode

[0033] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] Refer to the attached Figures 1-8, a dynamic centering device for an ultra-fine copper wire 5 before drawing proposed by the present invention, which can detect and dynamically adjust the spatial position of the copper wire 5 in real time before the copper wire 5 enters the die hole, ensuring that its central axis coincides strictly with the central axis of the die hole of the wire drawing die 4 (concentric), so as to realize the precise axial introduction of the copper wire 5. It includes a detection component 1 and a centering component 2 arranged on the front side of the inlet end of the wire drawing die 4; wherein, the detection component 1 is used to detect the coincidence degree of the central axis of the copper wire 5 and the central axis of the die hole of the wire drawing die 4 (i.e., the eccentric state), and 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 component 2 includes a driving member 21, a planetary mechanism 22, a connecting shaft 23, and a centering wheel 24. The planetary mechanism 22 includes a sun gear 221, a plurality of planetary gears 222, and a ring gear 223. The central axis of the sun gear 221 coincides with the central axis of the die hole of the wire drawing die 4. The sun gear 221 is axially provided with a through hole 2211 through which the copper wire 5 can pass. A plurality of planetary gears 222 are meshed and connected between the sun gear 221 and the ring gear 223 at intervals. The connecting shaft 23 is coaxially connected to the planetary gear 222, and the centering wheel 24 is coaxially connected to the connecting shaft 23. The driving member 21 drives the sun gear 221 to rotate, the sun gear 221 drives the planetary gears 222 to rotate, and the planetary gears 222 drive the centering wheel 24 to rotate around the central axis of the sun gear 221; wherein, please refer to 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 perpendicular 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 die hole axis, during the revolution of the centering wheel 24, its maximum diameter working surface keeps non-pressure contact and non-interference with the surface of the copper wire 5, only playing a guiding role and not applying a corrective force. As Figure 5 shown, when the copper wire 5 deviates from the central axis to a certain side, the centering wheel 24 rotates to this eccentric side on the revolution trajectory, and its working surface will contact and radially press 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 direction, thereby correcting the copper wire 5 to a position precisely coinciding with the die hole axis in real time and dynamically. The technical solution in the present invention can, according to the detected deviation of the copper wire 5 in real time, apply a precise radial corrective force through the continuous rotary scanning of the centering wheel 24 driven by the planetary mechanism 22, ensuring that the copper wire 5 always enters the die hole with the minimum eccentricity (ideally zero eccentricity), avoiding the scratching of the copper wire 5 and the edge of the die hole caused by eccentricity, making the axial introduction of the copper wire 5 cause the drawing force to act symmetrically on the entire cross-section, significantly improving the deformation uniformity, and fundamentally eliminating the stress concentration phenomenon caused by non-axial entry into the die, greatly reducing the fracture risk of the ultra-fine copper wire 5 during the drawing process, and improving the 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 planet gear 222. External threads are provided at both ends of the connecting shaft 23, and one end thereof is threadedly connected to the threaded hole 2221, and a nut sleeve 25 is threadedly connected to the other end. 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 cooperated with the limiting ring 231 and the nut sleeve 25. A jack hole 243 is penetrated through the center of the end face of the centering wheel 24. The smooth shaft section 232 penetrates through the jack 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 nut sleeve 25 against the outer end face of the centering wheel 24 and acting together with the limiting ring 231, the centering wheel 24 is axially positioned and constrained on the smooth shaft section 232, and at the same time, the centering wheel 24 is allowed to freely rotate around the smooth shaft section 232. The centering wheel 24 can not only revolve with the planet gear 222, but also freely rotate around its own axis (i.e., the axis of the connecting shaft 23) on the smooth shaft section 232. While performing dynamic centering during revolution, the self-rotation movement of the centering wheel 24 continuously changes its contact area with the surface of the ultra-fine copper wire 5. When the outer wall of the centering wheel 24 contacts the copper wire 5 due to friction, the self-rotation movement continuously changes the contact area, effectively avoiding local excessive wear on the working surface of the centering wheel 24 caused by long-term fixed contact with the same position of the copper wire 5. By evenly distributing the wear, the service life of the centering wheel 24 is significantly extended, and it is ensured that during the entire service period, the working surface profile of the centering wheel 24 (especially the maximum working radius R2) remains stable, thereby permanently maintaining the high-precision dynamic centering ability of the device.

[0038] To ensure the stability and reliability of the planetary gear mechanism under high-speed operation, a precise axial limiting structure is designed on both sides of the gear ring 223 in this embodiment. Specifically, limiting rings 224 are connected to both sides of the gear ring 223 through a plurality of bolts evenly distributed in the circumferential direction. The inner diameter of the limiting ring 224 is smaller than the inner diameter of the gear ring 223 to form an axial blocking surface for both end faces of the planet gear 222. The edge of the limiting ring 224 blocks both sides of the planet gear 222 to limit the axial movement of the planet gear 222, improve the rigidity and stability of the transmission system, avoid the planet gear 222 from shifting under the action of axial force, and prevent it from accidentally contacting or interfering with adjacent components.

[0039] In this embodiment, a bracket 3 is further included. The driving member 21 includes a motor 211 fixedly connected to the bracket 3 and a driving gear 212 coaxially and fixedly connected to the output end of the motor 211. One end of the sun gear 221 extends outside the ring gear 223 and is meshed and connected with the driving gear 212. The motor 211 drives the driving gear 212 to rotate, the driving gear 212 drives the sun gear 221 to rotate, and drives the connecting shaft 23 and the centering wheel 24 to rotate through the planetary mechanism 22. In addition, the driving member 21 can also be a driving pulley driven by the motor 211. The shaft section of the sun gear 221 extends outside the ring gear 223 and is fixedly connected with a driven pulley, and the sun gear 221 is driven to rotate by a belt wound around the driving pulley and the driven pulley. Among them, the motor 211 is a servo motor 211 or frequency conversion control, which can accurately adjust the revolution speed of the centering wheel 24 to meet the process requirements of different wire diameters and different drawing speeds.

[0040] Preferably, a cage 225 is further fixedly connected to the bracket 3. The cage 225 includes two independent rings 2251 that can sandwich both sides of the ring gear 223 to fix the ring gear 223. Arc-shaped strips 2252 are arranged on both sides of one of the independent rings 2251. The inner wall of the arc-shaped strip 2252 is attached to the outer wall of the ring gear 223. Coaxial screw holes are provided on the surface of the arc-shaped strip 2252 and the surface of the other independent ring 2251, and the two independent rings 2251 are connected by bolts screwed into the screw holes. Among them, the arc-shaped strip 2252 is designed to fit the curved surface of the outer wall of the ring gear 223 to eliminate the assembly gap and ensure the coaxiality of the central axis of the ring gear 223 and the axis of the sun gear 221. The double-independent-ring 2251 sandwiching structure synchronously restricts the axial displacement and radial vibration of the ring gear 223, improving the installation accuracy and operation stability of the ring gear 223.

[0041] Among them, the end of the centering wheel 24 away from the planet gear 222 extends into a tapered section 241 with a gradually decreasing outer diameter to form a guiding surface converging towards the die hole. The inclination angle between the outer wall surface of the tapered section 241 and its central axis does not exceed 15°. An arc-shaped chamfer 242 is provided at the edge of the tapered section 241, and the curvature radius R of the arc-shaped chamfer 242 ≥ 0.1 mm. When the offset copper wire 5 contacts the conical surface, the conical surface forms a gentle radial deviation correction force on the copper wire 5, causing the copper wire 5 to slide along the conical 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 the contact stress and eliminating the risk of grain boundary slip and microcracks of the copper wire 5 caused by edge stress concentration.

[0042] Figure 6The specific structure of an embodiment of the detection component 1 is shown. 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 the bracket 3, and the central axis of the detection ring 12 coincides with the central axis of the sun gear 221. A plurality of photoelectric emitters 13 and a plurality of photoelectric receivers 14 are circumferentially and equally connected to the inner wall of the detection ring 12. A signal connector 15 electrically connected to the photoelectric emitters 13 and the photoelectric receivers 14 is arranged on the detection ring 12. The photoelectric emitters 13 and the photoelectric receivers 14 are in one-to-one correspondence to form an annular array detection. The signal connector 15 is externally connected to a controller. The photoelectric receiver 14 converts the photocurrent into an electrical signal and transmits it to the externally connected controller. The controller determines the offset direction and amplitude of the copper wire 5 by analyzing which specific photoelectric receivers 14 are triggered. The controller is also electrically connected to the motor 211 to control the start and stop of the driving member 21. In the ideal centering state, the copper wire 5 is accurately located on the central axis of the detection ring 12, completely blocking the light beam paths from all the photoelectric emitters 13 to the receivers, and there is no light signal input to the photoelectric receivers 14. When the copper wire 5 deviates from the central axis, the light beam channel in the offset direction is no longer blocked by the copper wire, and the corresponding photoelectric receiver 14 receives the light beam and generates an electrical signal. The photoelectric receiver 14 transmits the electrical signal to the externally connected controller through the signal connector 15, and the controller immediately instructs the motor 211 to drive the planetary mechanism 22 to apply a reverse correction force to the copper wire 5 through the centering wheel 24. When the system detects that all the photoelectric receivers 14 have no signal (indicating that the copper wire 5 has returned to the central position), the controller terminates the operation of the motor 211, thereby realizing the closed-loop control of dynamic deviation correction. In the present invention, in the ideal centering state, the centering wheel 24 realizes the frictionless guiding of the copper wire 5, and only applies the necessary correction force when the deviation is detected, combining high efficiency and protection.

[0043] Preferably, with a virtual line perpendicular to the central axis of the detection ring 12 as the boundary, all the photoelectric emitters 13 are distributed on one side of the virtual line, and all the photoelectric receivers 14 are distributed on the other side of the virtual line. The photoelectric emitters 13 and the photoelectric receivers 14 are equally spaced. Through physical isolation and spatial symmetry, the cross-interference of adjacent light beams is effectively avoided, ensuring the uniqueness of the offset detection signal and the direction identification accuracy.

[0044] In addition, the detection component 1 can also be four groups of tungsten carbide azimuth probes annularly distributed at 90° on the path of the copper wire 5. The tails of the probes are connected to piezoelectric ceramic force sensors. When the copper wire 5 is eccentric, it will press the corresponding azimuth probe, resulting in an increase in the piezoelectric force signal, thereby determining the offset direction.

[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 offset of the central coordinates by a computer.

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

[0047] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions 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 wire drawing, characterized in that: It includes a detection component (1) and a centering component (2) arranged on the front side of the inlet end of the wire drawing die; The detection component (1) is used to detect the coincidence degree between the central axis of the copper wire and the central axis of the die hole of the wire drawing die; The centering component (2) includes a driving member (21), a planetary mechanism (22), a connecting shaft (23), and a centering wheel (24). The planetary mechanism (22) includes a sun gear (221), a plurality of planetary gears (222), and a ring gear (223). The central axis of the sun gear (221) coincides with the central axis of the die hole of the wire drawing die. The sun gear (221) is axially provided with a through hole (2211) through which the copper wire can pass. The driving member (21) drives the sun gear (221) to rotate. A plurality of planetary gears (222) are meshed and connected between the sun gear (221) and the ring gear (223) at intervals. The connecting shaft (23) is coaxially connected to the planetary gear (222), and 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 wire 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 of an ultra-fine copper wire according to claim 1, characterized in that: A threaded hole (2221) is opened at the center of the end face of the planetary gear (222). Both ends of the connecting shaft (23) are provided with external threads, and one end is threadedly connected to the threaded hole (2221), and the other end is threadedly connected to a sleeve (25). A limiting ring (231) is arranged on the connecting shaft (23). The connecting shaft (23) is a smooth shaft section (232) between the external threads cooperated with the limiting ring (231) and the sleeve (25). A jack (243) is penetrated through the center of the end face of the centering wheel (24). The smooth shaft section (232) penetrates through the jack (243) so that the centering wheel (24) is rotatably sleeved on the smooth shaft section (232).

3. The dynamic centering device before drawing of an ultra-fine copper wire according to claim 1, characterized in that: Both sides of the ring gear (223) are connected with a limiting ring (224) through a plurality of bolts evenly distributed in the circumferential direction. The inner diameter of the limiting ring (224) is smaller than the inner diameter of the ring gear (223). The edge of the limiting ring (224) blocks both sides of the planetary gear (222) to limit the axial movement of the planetary gear (222).

4. The dynamic centering device before drawing of an ultra-fine copper wire according to claim 2, characterized in that: It further includes a bracket (3). The driving member (21) includes a motor (211) fixedly connected to the bracket (3) and a driving gear (212) coaxially and fixedly connected to the output end of the motor (211). One end of the sun gear (221) extends out of the ring gear (223) and is meshed and connected to the driving gear (212).

5. The dynamic centering device for an ultra-fine copper wire before wire drawing according to claim 4, characterized in that: A cage (225) is also fixedly connected to the bracket (3). The cage (225) includes two independent ring bodies (2251) that can sandwich both sides of the ring gear (223) to fix the ring gear (223). Arc-shaped strips (2252) are arranged on both sides of one independent ring body (2251). The inner wall of the arc-shaped strip (2252) fits with the outer wall of the ring gear (223). Screw holes coaxial with each other are opened on the surface of the arc-shaped strip (2252) and the surface of the other independent ring body (2251), and the two independent ring bodies (2251) are connected by bolts threadedly connected to the screw holes.

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

7. A dynamic centering device for an ultra-fine copper wire before wire drawing according to any one of claims 1-6, characterized in that: The detection assembly (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). A plurality of photoelectric emitters (13) and a plurality of photoelectric receivers (14) are equally connected circumferentially around the inner wall of the detection ring (12). A signal connector (15) electrically connected to the photoelectric emitters (13) and the photoelectric receivers (14) is provided on the detection ring (12). The photoelectric emitters (13) and the photoelectric receivers (14) are in one-to-one correspondence. 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 for an ultra-fine copper wire before wire drawing according to claim 7, characterized in that: Taking a virtual line perpendicular to the central axis of the detection ring (12) as a boundary, all the photoelectric emitters (13) are distributed on one side of the virtual line, and all the photoelectric receivers (14) are distributed on the other side of the virtual line. The photoelectric emitters (13) and the photoelectric receivers (14) are equally spaced from each other.

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