A continuous intermediate annealing apparatus for gold-palladium-copper wire

Abstract

This invention provides a continuous intermediate annealing device for gold-palladium-copper wire, belonging to the technical field of annealing equipment. It solves the technical problem of large tension fluctuations and easy wire breakage caused by the mismatch between the pay-off and take-up speeds in existing intermediate annealing equipment. The continuous intermediate annealing device for gold-palladium-copper wire includes a worktable and an annealing assembly fixedly mounted on the worktable surface. A pay-off unit is provided on the outer side of the wire inlet end of the annealing assembly, and a take-up unit is provided on the outer side of the wire outlet end of the annealing assembly. In this invention, under the action of a first synchronous belt and a second synchronous belt, a drive motor simultaneously drives the pay-off unit and the take-up unit. A torsion spring connects the sleeve to the second planetary gear carrier. When tension fluctuations occur during pay-off and take-up, the torsion spring can undergo elastic deformation, driving the planetary gear set to rotate relative to each other, thereby automatically adjusting the difference between the pay-off speed and the take-up speed, ensuring that the gold-palladium-copper wire remains in a constant low-tension state throughout the annealing process.

Description

Technical Field

[0001] This invention belongs to the technical field of annealing equipment, and relates to an intermediate annealing device, particularly a continuous intermediate annealing device for gold-palladium-copper wire. Background Technology

[0002] Gold-palladium-copper wire is a multi-element alloy micro-wire formed by adding precious metal elements such as gold and palladium to a copper matrix. It has excellent electrical conductivity, thermal conductivity, corrosion resistance, and good bonding performance, and is widely used in semiconductor packaging, integrated circuit lead bonding, and precision electronic component connection. Compared with traditional pure copper wire or copper alloy wire, the addition of gold in gold-palladium-copper wire significantly improves the wire's oxidation resistance and bonding reliability, while the addition of palladium further improves the wire's mechanical strength and resistance to electrochemical migration, enabling it to maintain good connection stability under harsh conditions such as high temperature and high humidity. Therefore, gold-palladium-copper wire has become one of the most promising bonding materials in the field of high-end electronic packaging.

[0003] Gold-palladium-copper wire, as a bonding wire material for high-end semiconductor packaging, typically has a finished diameter of only 15-25 micrometers, much thinner than a human hair. It has the characteristics of low tensile strength, extremely small breaking load, and extreme sensitivity to tension fluctuations. In the wire drawing process of gold-palladium-copper wire, the intermediate annealing process is the key step to eliminate processing stress and restore the plasticity of the material. Continuous annealing equipment is a common means to achieve efficient and uniform annealing.

[0004] A search revealed a Chinese patent document disclosing an intermediate annealing apparatus and method for bonded alloy wires [Application No.: CN202311804417.9; Publication No.: CN118086660A]. This intermediate annealing apparatus for bonded alloy wires includes a wire feeding assembly, an annealing chamber, a dripping assembly, a drying assembly, and a take-up assembly mounted on a worktable. A gas supply pipe is fixedly connected to the top of the annealing chamber. This intermediate annealing apparatus and method for bonded alloy wires can detect defects such as bamboo-like patterns and wool curls on the surface of the bonded alloy wire body before it enters the annealing chamber, preventing unqualified bonded alloy wire bodies from entering the annealing chamber for annealing, ensuring annealing quality while avoiding waste of manpower and resources.

[0005] Although the intermediate annealing device disclosed in this patent can detect defects before annealing, it lacks tension synchronization and compensation components between its wire feeding and take-up components. For gold-palladium-copper wires with extremely fine diameters and extremely narrow allowable tension ranges, even a slight speed difference between wire feeding and take-up can cause the wire to break or become loose and tangled, seriously affecting the stability and yield of continuous annealing operations. Summary of the Invention

[0006] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a continuous intermediate annealing device for gold-palladium-copper wire. The technical problem this invention aims to solve is: how to avoid wire breakage or loosening caused by the difference between the pay-off and take-up speeds during continuous annealing of gold-palladium-copper wire.

[0007] The objective of this invention can be achieved through the following technical solutions: A continuous intermediate annealing device for gold-palladium-copper wire includes a workbench and an annealing assembly fixedly installed on the surface of the workbench. A wire feeding unit is provided on the outside of the wire inlet end of the annealing assembly, and a wire take-up unit is provided on the outside of the wire outlet end of the annealing assembly. The wire feeding unit and the wire take-up unit are both fixedly connected to the surface of the workbench, and a floating wheel unit is provided between the wire feeding unit, the wire take-up unit and the annealing assembly. A fixed plate is fixedly installed at the bottom of the workbench, and a drive motor is fixedly installed on one outer wall of the fixed plate, and a fixed sleeve is fixedly installed on the other outer wall of the fixed plate. A first planetary carrier is fixedly installed at the output end of the drive motor, and the first planetary carrier is rotatably connected inside the fixed sleeve. The surface of the first planetary carrier is rotatably connected to multiple first planetary gears. The outer walls of the multiple first planetary gears are meshed with one side of an inner double gear ring, and the inner double gear ring is rotatably connected to the outer wall of the fixed sleeve. A sleeve is fixedly installed on the outer wall of the inner double gear ring, and the sleeve is drivenly connected to a wire feeding unit. Multiple first planetary gears are internally meshed with a first sun gear, and an output rod is fixedly installed inside the first sun gear; The outer wall of the output rod is also fixedly mounted with a second sun gear, and the second sun gear is arranged parallel to the first sun gear. The outer wall of the output rod is fixedly mounted with a second planet carrier, and the surface of the second planet carrier is rotatably connected with multiple second planet gears. The multiple second planet gears are meshed with the outer wall of the second sun gear, and the outer wall of the multiple second planet gears is meshed with another gear ring of the inner double gear ring. A torsion spring is provided between the sleeve and the second planetary carrier. One end of the torsion spring is fixedly connected to the inner wall of the sleeve, and the other end of the torsion spring is fixedly installed on the outer wall of the second planetary carrier. The outer wall of the output rod is fixedly engaged with a meshing wheel, and the meshing wheel is driven by a take-up unit. The torsion spring is used to elastically deform when a speed difference occurs between the pay-off unit and the take-up unit, so as to change the relative angle between the second planetary carrier and the sleeve, thereby adjusting the transmission ratio and compensating for wire tension fluctuations.

[0008] The working principle of this invention is as follows: During operation, the gold-palladium-copper wire coil to be annealed is mounted on the pay-off reel. The wire sequentially passes through the pay-off guide wheel, the first floating wheel unit, the tension wheel inside the annealing chamber, the annealing wheel, the tension wheel, and the second floating wheel unit, and finally winds onto the take-up reel. The drive motor is started, and the output of the drive motor drives the first planetary carrier to rotate. The first planetary carrier divides the power into two paths through multiple first planetary gears. One path drives the sleeve to rotate through one side of the internal double-gear ring. The sleeve drives the pay-off synchronous pulley and the... The feed rod rotates, thus enabling the feed reel to actively feed the wire. Simultaneously, the output rod rotates via the first sun gear, which in turn drives the second sun gear, the second planetary gear, and the other side of the internal double gear ring, ultimately acting on the sleeve. At the same time, the engagement wheel at the end of the output rod drives the take-up timing wheel and the take-up rod via the first synchronous belt, enabling the take-up reel to actively take in the wire. A torsion spring is connected between the sleeve and the second planetary carrier. When the linear speeds of the feed and take-up reels are inconsistent, causing abnormal wire tension, the torsion spring undergoes torsional deformation. This causes relative rotation between the second planetary carrier and the sleeve, thereby changing the meshing transmission ratio between the second planetary gear and the internal double gear ring. This allows for real-time fine-tuning of the take-up speed relative to the unwinding speed, creating negative feedback and maintaining constant wire tension. Simultaneously, during the annealing process, a bidirectional motor can be activated as needed to drive the lead screw, causing the moving plate to move horizontally along the guide column. The tension wheel, annealing wheel, and tension wheel on the moving plate move accordingly, changing the winding path length and contact angle of the wire on the annealing wheel, adjusting the heating length and tension in the annealing zone. Furthermore, a gap between the moving plate and the annealing chamber facilitates the placement of cooling water at the bottom of the annealing chamber. During wire movement, the floating wheels in each floating wheel unit compress or stretch the first or second spring according to changes in wire tension, sliding up and down within the moving groove to further absorb short-term tension peaks, ensuring the wire passes smoothly through the entire annealing equipment. After intermediate annealing in the annealing chamber, the gold-palladium-copper wire is neatly wound by the take-up wheel, thus completing the continuous intermediate annealing operation.

[0009] The annealing assembly includes an annealing chamber fixedly connected to the surface of the workbench, and a bidirectional motor is fixedly installed on the outer wall of the annealing chamber. The output end of the bidirectional motor is fixedly connected to a lead screw, which is rotatably connected inside the annealing chamber. The outer wall of the lead screw is connected to a movable plate via a ball nut. The movable plate is slidably connected inside the annealing chamber, and there is a gap between the bottom end of the movable plate and the inner bottom wall of the annealing chamber.

[0010] By adopting the above structure, the horizontal position of the moving plate in the annealing chamber can be precisely controlled through the cooperation of the lead screw and the moving plate, thereby changing the winding path length and contact angle of the gold palladium copper wire on the annealing wheel, realizing stepless adjustment of the heating length and tension of the annealing area, so as to adapt to the annealing process requirements of gold palladium copper wires of different diameters and materials.

[0011] The annealing chamber is internally fixedly connected to multiple guide columns, which are arranged parallel to the lead screw, and the outer wall of the guide columns is slidably connected to a movable plate.

[0012] With the above structure, the guide column provides stable linear guidance for the moving plate, preventing the moving plate from deflecting or getting stuck during movement, and ensuring that the annealing wheel, tension wheel and pulling wheel are always in the same plane, avoiding wire deviation or abrasion.

[0013] A tension wheel is rotatably connected to the surface of the movable plate, and the tension wheel is located on one side of the annealing chamber inlet. An annealing wheel is also rotatably mounted on the surface of the movable plate, and the annealing wheel is located at the lower part of the movable plate. The surface of the movable plate is also rotatably connected to a tension wheel, which is located on one side of the take-up end of the annealing chamber.

[0014] With the above structure, the tension wheel is used to guide the filament into the annealing area and maintain stable tension at the inlet end, the annealing wheel acts as a heating electrode or heat conduction wheel to perform contact heating and annealing on the filament, and the tension wheel is used to guide the filament out of the annealing area and maintain tension at the outlet end. The three work together to ensure that the filament runs smoothly in the annealing chamber and obtains a uniform annealing effect.

[0015] The floating wheel unit includes a fixed seat, which is fixedly installed on the surface of the workbench. The upper part of the fixed seat is arranged in a "U" shape, and both sides of the upper part of the fixed seat are provided with moving grooves. The inner walls of the two movable slots are slidably connected by connecting blocks. A first spring is fixedly installed at the bottom of one connecting block, and a second spring is fixedly installed at the top of the other connecting block. The other ends of the first spring and the second spring are both fixedly installed inside the movable slot. A floating wheel is rotatably connected between the two connecting blocks.

[0016] With the above structure, the floating wheel can float up and down along the moving groove under the bidirectional elastic support of the first and second springs. When the tension of the wire changes instantaneously, the floating wheel automatically adjusts its position to absorb the tension peak, playing a role in buffering and storing energy, effectively preventing wire breakage caused by sudden tension changes.

[0017] The wire feeding unit includes a wire feeding frame, which is fixedly installed on the surface of the workbench. A wire feeding rod is rotatably connected inside the wire feeding frame, and a wire feeding wheel is fixedly installed on the outer wall of the wire feeding rod. A wire feeding synchronous wheel is also fixedly installed on the outer wall of the wire feeding rod. A second synchronous belt is meshed on the outer wall of the wire feeding synchronous wheel, and a sleeve is meshed on the inner wall of the other side of the second synchronous belt.

[0018] With the above structure, the sleeve drives the wire feeding pulley to rotate via the second synchronous belt, which in turn drives the wire feeding rod and the wire feeding pulley to rotate, thereby realizing active wire feeding. This makes the wire feeding speed related to the output speed of the drive motor, which is convenient for synchronous control through the differential mechanism.

[0019] The upper part of the wire feeding frame is rotatably connected to an upper adjustment wheel, and the top of the upper adjustment wheel is fixedly connected to an operating end, which is located above the wire feeding frame. The outer wall of the wire feeding rod is also fixedly installed with a first gear plate, and the top of the first gear plate is meshed with a second gear plate. The second gear plate is rotatably connected to one side of the wire feeding frame, and the other side of the second gear plate is fixedly connected with a wire feeding guide wheel, which is located above the wire feeding wheel.

[0020] With the above structure, the relative angle between the pay-off wheel and the pay-off guide wheel can be adjusted by rotating the upper adjustment wheel at the operating end, thereby changing the angle and tension of the wire drawn out from the pay-off wheel, preventing the wire from getting tangled or damaged by friction during the pay-off process. At the same time, the meshing transmission of the first gear plate and the second gear plate ensures the linkage between the pay-off guide wheel and the pay-off wheel, so that the wire always adheres to the surface of the pay-off wheel.

[0021] The take-up unit includes a take-up frame, which is fixedly installed on the surface of the workbench. A take-up rod is rotatably connected inside the take-up frame, and a take-up wheel is fixedly installed on the outer wall of the take-up rod. The outer wall of the take-up rod is also fixedly installed with a take-up synchronous pulley, and the outer wall of the take-up synchronous pulley is engaged with a first synchronous belt, and the inner wall of the other end of the first synchronous belt is engaged with a meshing pulley.

[0022] With the above structure, the meshing wheel drives the take-up synchronous wheel to rotate through the first synchronous belt, which in turn drives the take-up rod and take-up wheel to rotate, realizing active take-up. The take-up speed is related to the rotation speed of the output rod, providing the execution basis for differential tension compensation.

[0023] The upper part of the take-up frame is rotatably connected to an upper pressure wheel, and the top of the upper pressure wheel is fixedly connected to an operating end, which is located above the take-up frame. A third gear plate is fixedly installed on the outer wall of the take-up rod, and a fourth gear plate is meshed with the top of the third gear plate. The fourth gear plate is rotatably connected to one side of the take-up frame, and a take-up guide wheel is fixedly connected to the other side of the fourth gear plate, with the take-up guide wheel located above the take-up wheel.

[0024] With the above structure, the relative angle between the take-up wheel and the take-up guide wheel can be adjusted by rotating the upper pressure wheel at the operating end, thereby changing the angle and clamping force of the wire winding onto the take-up wheel, so that the wire is arranged neatly and tightly, avoiding looseness or tangling. The meshing transmission of the third gear plate and the fourth gear plate ensures the linkage between the take-up guide wheel and the take-up wheel, ensuring the stability of the take-up process.

[0025] Compared with the prior art, the continuous intermediate annealing equipment for gold-palladium-copper wire of the present invention has the following advantages: 1. In this invention, under the action of the first and second synchronous belts, the drive motor simultaneously drives the wire feeding unit and the wire take-up unit. The sleeve is connected to the second planetary carrier by a torsion spring. When the tension of the wire feeding and take-up fluctuates, the torsion spring can undergo elastic deformation, which drives the planetary gear set to rotate relative to each other. This automatically adjusts the difference between the wire feeding speed and the wire take-up speed, ensuring that the gold-palladium-copper wire is always in a constant low tension state during the annealing process. This effectively avoids the problems of wire breakage and loosening caused by sudden tension changes or speed mismatch, and greatly improves the stability and yield of continuous annealing of ultrafine gold-palladium-copper wire.

[0026] 2. In this invention, by setting a movable plate in the annealing assembly and integrating a tension wheel, an annealing wheel, and a tension wheel on the movable plate, stepless adjustment of the annealing path length and precise control of the tension in the annealing area are achieved. The bidirectional motor drives the lead screw to rotate, causing the movable plate to move horizontally within the annealing chamber, thereby changing the wrap angle of the gold-palladium-copper wire on the annealing wheel and the effective annealing length. This allows for flexible adaptation to the annealing process requirements of gold-palladium-copper wires of different diameters and materials, significantly improving the process adaptability and annealing uniformity of the equipment.

[0027] 3. In this invention, by setting floating wheel units between the wire feeding unit and the annealing assembly, and between the annealing assembly and the take-up unit, the instantaneous tension fluctuations between each station are further absorbed and buffered. The floating wheel unit provides bidirectional elastic support to the connecting block through the first spring and the second spring located in the moving groove, so that the floating wheel can automatically float up and down according to the wire tension, playing a role in dynamic energy storage and buffering. Together with the sleeve, the second planetary carrier and the torsion spring, it forms a double tension guarantee, which is particularly suitable for the continuous processing of gold palladium copper wire micro filaments with extremely low tensile strength. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of a continuous intermediate annealing device for gold-palladium-copper wire according to the present invention; Figure 2 This is a side view cross-sectional structural diagram of the annealing chamber in this invention; Figure 3 This is a cross-sectional three-dimensional structural diagram of the annealing chamber of the present invention; Figure 4 This is a schematic diagram of the structure of the sleeve, the second planetary gear, and the torsion spring in this invention; Figure 5 This is a cross-sectional structural diagram of the sleeve in this invention; Figure 6 This is a schematic cross-sectional view of the output rod and the sun gear in this invention; Figure 7 This is a schematic diagram of the floating wheel unit in this invention; Figure 8 This is a cross-sectional structural diagram of the floating wheel unit in this invention.

[0029] In the diagram, 1. Workbench; 2. Annealing assembly; 201. Annealing chamber; 202. Lead screw; 203. Bidirectional motor; 204. Moving plate; 205. Guide column; 206. Tension wheel; 207. Annealing wheel; 208. Pulling wheel; 3. Floating wheel unit; 301. Fixed base; 302. Moving groove; 303. Connecting block; 304. First spring; 305. Second spring; 306. Floating wheel body; 4. Wire feeding unit; 401. Wire feeding frame; 402. Wire feeding wheel; 403. Adjusting wheel; 404. Wire feeding rod; 405. Wire feeding synchronous wheel; 406. First gear plate; 407. Second gear. 408. Wire feeding guide roller; 5. Wire take-up unit; 501. Wire take-up frame; 502. Wire take-up reel; 503. Upper pressure roller; 504. Wire take-up rod; 505. Wire take-up synchronous pulley; 506. Third gear plate; 507. Fourth gear plate; 508. Wire take-up guide roller; 6. Fixed plate; 7. First planetary carrier; 8. Fixed sleeve; 9. First planetary gear; 10. Internal double gear ring; 11. Sleeve; 12. Second sun gear; 13. Second planetary gear; 14. Second planetary carrier; 15. Output rod; 16. Torsion spring; 17. Meshing wheel; 18. First synchronous belt; 19. Second synchronous belt; 20. First sun gear. Detailed Implementation

[0030] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0031] like Figures 1-8As shown, a continuous intermediate annealing device for gold-palladium-copper wire includes a workbench 1, an annealing assembly 2 fixedly mounted on the surface of the workbench 1, an annealing box 201, a lead screw 202, a bidirectional motor 203, a moving plate 204, a guide column 205, a tension wheel 206, an annealing wheel 207, a tension wheel 208, a floating wheel unit 3, a fixed base 301, a moving groove 302, a connecting block 303, a first spring 304, a second spring 305, a floating wheel body 306, a wire feeding unit 4, a wire feeding frame 401, a wire feeding wheel 402, an upper adjusting wheel 403, a wire feeding rod 404, a wire feeding synchronous wheel 405, a first gear plate 406, a second gear plate 407, a wire feeding guide wheel 408, a wire take-up unit 5, a wire take-up frame 501, a take-up wheel 502, an upper pressure wheel 503, and a take-up mechanism. The components include a rod 504, a take-up synchronous pulley 505, a third gear plate 506, a fourth gear plate 507, a take-up guide wheel 508, a fixed plate 6, a first planetary carrier 7, a fixed sleeve 8, a first planetary gear 9, an internal double gear ring 10, a sleeve 11, a second sun gear 12, a second planetary gear 13, a second planetary carrier 14, an output rod 15, a torsion spring 16, a meshing wheel 17, a first synchronous belt 18, a second synchronous belt 19, and a first sun gear 20. The worktable 1 is made of stainless steel, with a flat surface and a shock-absorbing structure. The annealing assembly 2 is fixedly installed in the middle of the worktable 1. The wire feeding unit 4 and the wire take-up unit 5 are respectively installed on the outside of the wire inlet end and the outside of the wire outlet end of the annealing assembly 2. A floating wheel unit 3 is provided between the wire feeding unit 4, the wire take-up unit 5 and the annealing assembly 2. The annealing assembly 2 includes an annealing chamber 201 fixedly connected to the surface of the workbench 1. The annealing chamber 201 is a rectangular sealed chamber filled with an inert protective gas, such as nitrogen, with a flow rate controlled at 5~10L / min. The left inlet and right outlet of the annealing chamber 201 are respectively provided with guide holes for the wire to pass through. Ceramic wear-resistant sleeves are embedded in the guide holes. A bidirectional motor 203 (model: 57BYG250H, stepper motor) is fixedly installed on the outer wall of the annealing chamber 201. The output end of the bidirectional motor 203 is fixedly connected to a lead screw 202 through a coupling. The lead screw 202 is a ball screw (diameter 16mm, lead 5mm). The two ends of the lead screw 202 are rotatably connected to the front and rear inner walls of the annealing chamber 201 through rolling bearings. A movable plate 204 is connected to the outer wall of the lead screw 202 through ball nuts. The movable plate 204 is an aluminum alloy plate, and its two sides slide against the inner side wall of the annealing chamber 201. The annealing chamber 201 is also fixedly connected with two parallel guide columns 205 (10mm in diameter, chrome-plated steel). The guide columns 205 are parallel to the lead screw 202 and located on both sides of the lead screw 202. The moving plate 204 is provided with corresponding linear bearing holes. The guide columns 205 pass through the linear bearing holes, so that the moving plate 204 moves smoothly under the drive of the lead screw 202. A 15mm gap is left between the bottom end of the moving plate 204 and the inner bottom wall of the annealing chamber 201. This gap is used to accommodate cooling water. Specifically, the bottom of the annealing chamber 201 is provided with a water inlet and a water outlet. The cooling water temperature is controlled at 20~25℃ to cool the bottom of the annealing chamber 201 and prevent overheating from affecting the quality of the wire.

[0032] Tension wheel 206, annealing wheel 207 and tension wheel 208 are rotatably connected to the surface of movable plate 204 via bearing seats. Tension wheel 206 is located on the side of movable plate 204 near the inlet end, annealing wheel 207 is located at the bottom of movable plate 204 (the wheel surface is about 10mm lower than the bottom surface of movable plate 204), and tension wheel 208 is located on the side of movable plate 204 near the outlet end. All three wheels are made of ceramic material, with smooth and insulated surfaces, and each wheel has a diameter of 60mm. Annealing wheel 207 is electrically connected to an external heating power supply (DC heating power supply, voltage 0~12V adjustable, current 0~200A) and serves as a heating electrode to perform resistance heating annealing on the gold palladium copper wire in contact with it.

[0033] Each floating wheel unit 3 includes a fixed base 301, which is fixed to the surface of the worktable 1 by bolts. The upper part of the fixed base 301 is U-shaped, and a vertical moving groove 302 is opened on each of the two side walls. A connecting block 303 is slidably connected in each moving groove 302. A first spring 304 (compression spring, wire diameter 1mm, outer diameter 10mm, free length 30mm) is fixedly installed at the bottom end of the right connecting block 303. The lower end of the first spring 304 is fixed to the bottom of the moving groove 302. The top of the left connecting block 303 is fixedly installed with a second spring 305. The upper end of the second spring 305 is fixed to the top of the moving groove 302. A floating wheel 306 (ceramic wheel, 40mm diameter) is rotatably connected between the two connecting blocks 303 through a bearing. The preload of the two springs is equal, so that the floating wheel 306 is in the middle position of the moving groove 302 when there is no wire. When the tension of the wire changes, the floating wheel 306 moves up and down, and the spring generates additional compression or stretching, thereby buffering the tension fluctuation.

[0034] The wire feeding unit 4 includes a wire feeding frame 401, which is fixed to the left end of the workbench 1. A wire feeding rod 404 is rotatably connected inside the wire feeding frame 401 via bearings. A wire feeding wheel 402 (I-beam wheel, capable of holding 1kg of gold-palladium-copper wire) and a wire feeding synchronous wheel 405 (40 teeth) are fixedly mounted on the wire feeding rod 404. The wire feeding synchronous wheel 405 is connected to the synchronous pulley (20 teeth) on the outer wall of the sleeve 11 via a second synchronous belt 19 (toothed synchronous belt, 5mm pitch). An upper adjusting wheel 403 is rotatably connected to the upper part of the wire feeding frame 401. The top of the upper adjusting wheel 403 is a handwheel operating end; rotating the handwheel adjusts the upper adjusting wheel 403 relative to the wire feeding distance. The distance between the wheels 402, and the outer wall of the wire feeding rod 404 is also fixedly installed with a first gear plate 406 (20 teeth). The top of the first gear plate 406 is meshed with a second gear plate 407 (20 teeth). The second gear plate 407 is rotatably connected to one side of the wire feeding frame 401. The other side of the second gear plate 407 is fixedly connected with a wire feeding guide wheel 408 (ceramic wheel, wheel diameter 30mm). The wire feeding guide wheel 408 is located directly above the wire feeding wheels 402. When the diameter of the wire on the wire feeding wheel 402 changes, rotating the upper adjustment wheel 403 can make the wire feeding guide wheel 408 move with the surface of the wire feeding wheel 402, keeping the wire drawing angle constant.

[0035] The take-up unit 5 includes a take-up frame 501, which is fixed to the right end of the workbench 1. A take-up rod 504 is rotatably connected inside the take-up frame 501 via bearings. A take-up wheel 502 (I-beam wheel) and a take-up timing wheel 505 (40 teeth) are fixedly mounted on the take-up rod 504. The take-up timing wheel 505 is connected to a meshing wheel 17 (20 teeth) via a first timing belt 18 (toothed timing belt, 5mm pitch). An upper pressure wheel 503 is rotatably connected to the upper part of the take-up frame 501. The top of the upper pressure wheel 503 is a handwheel operating end; rotating the handwheel allows for adjustment. The distance between the upper pressure roller 503 and the take-up roller 502, and the outer wall of the take-up rod 504 is also fixedly installed with a third gear plate 506 (20 teeth). The top of the third gear plate 506 is meshed with a fourth gear plate 507 (20 teeth). The fourth gear plate 507 is rotatably connected to one side of the take-up frame 501. The other side of the fourth gear plate 507 is fixedly connected with a take-up guide roller 508 (ceramic wheel, 30mm diameter). The take-up guide roller 508 is located directly above the take-up roller 502. Its function is similar to that of the unwinding guide roller 408, which is used to guide the wire to wind neatly.

[0036] A fixed plate 6 (10mm thick steel plate) is fixedly installed at the bottom of the workbench 1. A drive motor (servo motor, rated speed 1500rpm, rated torque 2N·m) is fixedly installed on the left outer wall of the fixed plate 6 via a motor mount. A fixed sleeve 8 (cylindrical, inner diameter 50mm) is fixedly installed on the right outer wall of the fixed plate 6. The output end of the drive motor passes through the fixed plate 6 and is fixedly installed on the first planetary carrier 7. The first planetary carrier 7 is rotatably connected to the inside of the fixed sleeve 8 via a bearing. The first planetary carrier 7 is disc-shaped, and three first planetary gears 9 (module 0.8, number of teeth 20) are rotatably connected to its right side via pins. The three first planetary gears 9 are evenly distributed around the circumference. The outer wall of the first planetary gears 9 is fitted with one side of the inner double gear ring 10 (module 0.8, number of teeth 80). The inner double gear ring 10 is annular, and its outer wall is rotatably connected to the outer wall of the fixed sleeve 8 via bearings. A sleeve 11 is fixedly installed on the outer wall of the inner double gear ring 10, and a timing pulley is fixedly fitted on the outer wall of the sleeve 11 for connecting the second timing belt 19. The inner sides of the three first planetary gears 9 are simultaneously meshed with a first sun gear 20 (module 0.8, number of teeth 40). An output rod 15 (a steel shaft with a diameter of 20mm) is fixedly installed at the center of the first sun gear 20. The output rod 15 passes through the center hole of the first planetary carrier 7 to the left and is supported in the fixed sleeve 8 by bearings. The outer wall of the output rod 15 is also fixedly mounted with a second sun gear 12 (module 0.8, number of teeth 40) and a second planetary carrier 14. The second sun gear 12 is located to the right of and parallel to the first sun gear 20. The second planetary carrier 14 is located to the right of the second sun gear 12. Three second planetary gears 13 (module 0.8, number of teeth 20) are rotatably connected to the second planetary carrier 14 via pins. All three second planetary gears 13 mesh with the outer wall of the second sun gear 12. At the same time, the outer walls of the three second planetary gears 13 mesh with the other side of the inner double gear ring 10 (module 0.8, number of teeth 80). The inner wall of the sleeve 11 meshes with the outer wall of the second planetary carrier 14. A torsion spring 16 (spring steel wire diameter 2mm, mean diameter 25mm, effective number of coils 8, free angle 0°) is installed in the middle. One end of the torsion spring 16 is inserted into the hole in the inner wall of the sleeve 11, and the other end is inserted into the hole in the outer wall of the second planetary carrier 14. When the unwinding speed and the take-up speed are inconsistent, causing the tension to change, the torsion spring 16 will generate torsional elastic deformation, so that the relative angle between the second planetary carrier 14 and the sleeve 11 is generated, thereby changing the meshing phase between the second planetary gear 13 and the inner double gear ring 10, adjusting the speed ratio between the output rod 15 and the sleeve 11 in real time, thereby adjusting the ratio of the take-up speed to the unwinding speed, forming negative feedback, and maintaining the constant tension of the wire. The rightmost end of the output rod 15 is fixedly equipped with a meshing wheel 17 (20 teeth), which is connected to the take-up synchronous wheel 505 via the first synchronous belt 18.

[0037] Working principle: During operation, the gold-palladium-copper wire coil to be annealed is mounted on the pay-off reel 402. The wire passes sequentially through the pay-off guide reel 408, the first floating wheel unit 3, the tension wheel 206 inside the annealing chamber 201, the annealing wheel 207, the tension wheel 208, and the second floating wheel unit 3, and finally winds onto the take-up reel 502. The drive motor is started, and the output of the drive motor drives the first planetary carrier 7 to rotate. The first planetary carrier 7 divides the power into two paths through multiple first planetary gears 9. One path drives the sleeve 11 to rotate through one side of the inner double gear ring 10. The sleeve 11 drives the pay-off synchronous pulley 405 and the pay-off rod 4 through the second synchronous belt 19. 04 rotates, thus enabling the pay-off reel 402 to actively pay off the wire. Another path drives the output rod 15 to rotate via the first sun gear 20. The output rod 15 sequentially drives the second sun gear 12, the second planetary gear 13, and the other side of the internal double gear ring 10, ultimately acting on the sleeve 11. Simultaneously, the meshing wheel 17 at the end of the output rod 15 drives the take-up synchronous wheel 505 and the take-up rod 504 to rotate via the first synchronous belt 18, enabling the take-up reel 502 to actively take off the wire. By connecting the torsion spring 16 between the sleeve 11 and the second planetary carrier 14, when the linear speed difference between the pay-off reel 402 and the take-up reel 502 causes abnormal wire tension, the torsion spring... The 16 will undergo torsional deformation, causing relative rotation between the second planetary carrier 14 and the sleeve 11. This changes the meshing transmission ratio between the second planetary gear 13 and the internal double gear ring 10, allowing for real-time fine-tuning of the take-up speed relative to the unwinding speed, forming negative feedback to maintain constant wire tension. Simultaneously, during the annealing process, the bidirectional motor 203 can be activated as needed to drive the lead screw 202 to rotate, causing the moving plate 204 to move horizontally along the guide post 205. The tension wheel 206, annealing wheel 207, and tension wheel 208 on the moving plate 204 move accordingly, thereby changing the winding path length and contact angle of the wire on the annealing wheel 207. The heating length and tension of the annealing zone are adjusted. Furthermore, by setting a gap between the moving plate 204 and the annealing chamber 201, it is convenient to set cooling water at the bottom of the annealing chamber 201. At the same time, during the wire running, the floating wheel 306 in each floating wheel unit 3 compresses or stretches the first spring 304 or the second spring 305 according to the changes in wire tension, and slides up and down in the moving groove 302 to further absorb short-term tension peaks, ensuring that the wire passes smoothly through the entire annealing equipment. After the gold palladium copper wire completes intermediate annealing in the annealing chamber 201, it is neatly wound by the take-up wheel 502, thus completing the continuous intermediate annealing operation.

[0038] In summary, in this invention, under the action of the first synchronous belt 18 and the second synchronous belt 19, the drive motor simultaneously drives the wire feeding unit 4 and the wire take-up unit 5. The sleeve 11 and the second planetary carrier 14 are connected by the torsion spring 16. When the tension of the wire feeding and take-up fluctuates, the torsion spring 16 can undergo elastic deformation, driving the planetary gear set to rotate relative to each other, thereby automatically adjusting the difference between the wire feeding speed and the take-up speed. This ensures that the gold-palladium-copper wire is always in a constant low tension state during the annealing process, effectively avoiding the problems of wire breakage and loosening caused by sudden tension changes or speed mismatch. This greatly improves the stability and yield of continuous annealing of ultrafine gold-palladium-copper wire and solves the technical problem of large tension fluctuations and easy wire breakage caused by the mismatch between the wire feeding and take-up speeds in existing intermediate annealing equipment.

[0039] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A continuous intermediate annealing apparatus for gold-palladium-copper wire, comprising a worktable and an annealing assembly fixedly mounted on the surface of the worktable, characterized in that: The annealing assembly has a wire feeding unit on the outside of the wire inlet end and a wire take-up unit on the outside of the wire outlet end. The wire feeding unit and the wire take-up unit are fixedly connected to the surface of the workbench, and a floating wheel unit is provided between the wire feeding unit, the wire take-up unit and the annealing assembly. A fixed plate is fixedly installed at the bottom of the workbench, and a drive motor is fixedly installed on one outer wall of the fixed plate, and a fixed sleeve is fixedly installed on the other outer wall of the fixed plate. A first planetary carrier is fixedly installed at the output end of the drive motor, and the first planetary carrier is rotatably connected inside the fixed sleeve. The surface of the first planetary carrier is rotatably connected to multiple first planetary gears. The outer walls of the multiple first planetary gears are meshed with one side of an inner double gear ring, and the inner double gear ring is rotatably connected to the outer wall of the fixed sleeve. A sleeve is fixedly installed on the outer wall of the inner double gear ring, and the sleeve is drivenly connected to a wire feeding unit. Multiple first planetary gears are internally meshed with a first sun gear, and an output rod is fixedly installed inside the first sun gear; The outer wall of the output rod is also fixedly mounted with a second sun gear, and the second sun gear is arranged parallel to the first sun gear. The outer wall of the output rod is fixedly mounted with a second planet carrier, and the surface of the second planet carrier is rotatably connected with multiple second planet gears. The multiple second planet gears are meshed with the outer wall of the second sun gear, and the outer wall of the multiple second planet gears is meshed with another gear ring of the inner double gear ring. A torsion spring is provided between the sleeve and the second planetary carrier. One end of the torsion spring is fixedly connected to the inner wall of the sleeve, and the other end of the torsion spring is fixedly installed on the outer wall of the second planetary carrier. The outer wall of the output rod is fixedly engaged with a meshing wheel, and the meshing wheel is driven by a take-up unit. The torsion spring is used to elastically deform when a speed difference occurs between the pay-off unit and the take-up unit, so as to change the relative angle between the second planetary carrier and the sleeve, thereby adjusting the transmission ratio and compensating for wire tension fluctuations.

2. The continuous intermediate annealing equipment for gold-palladium-copper wire according to claim 1, characterized in that, The annealing assembly includes an annealing chamber fixedly connected to the surface of the workbench, and a bidirectional motor is fixedly installed on the outer wall of the annealing chamber. The output end of the bidirectional motor is fixedly connected to a lead screw, which is rotatably connected inside the annealing chamber. The outer wall of the lead screw is connected to a movable plate via a ball nut. The movable plate is slidably connected inside the annealing chamber, and there is a gap between the bottom end of the movable plate and the inner bottom wall of the annealing chamber.

3. The continuous intermediate annealing equipment for gold-palladium-copper wire according to claim 2, characterized in that, The annealing chamber is internally fixedly connected to multiple guide columns, which are arranged parallel to the lead screw, and the outer wall of the guide columns is slidably connected to a movable plate.

4. The continuous intermediate annealing equipment for gold-palladium-copper wire according to claim 3, characterized in that, A tension wheel is rotatably connected to the surface of the movable plate, and the tension wheel is located on one side of the annealing chamber inlet. An annealing wheel is also rotatably mounted on the surface of the movable plate, and the annealing wheel is located at the lower part of the movable plate. The surface of the movable plate is also rotatably connected to a tension wheel, which is located on one side of the take-up end of the annealing chamber.

5. The continuous intermediate annealing equipment for gold-palladium-copper wire according to claim 1, characterized in that, The floating wheel unit includes a fixed base, which is fixedly installed on the surface of the workbench. The upper part of the fixed base is arranged in a "U" shape, and both sides of the upper part of the fixed base are provided with moving grooves. The inner walls of the two movable slots are slidably connected by connecting blocks. A first spring is fixedly installed at the bottom of one connecting block, and a second spring is fixedly installed at the top of the other connecting block. The other ends of the first spring and the second spring are both fixedly installed inside the movable slot. A floating wheel is rotatably connected between the two connecting blocks.

6. The continuous intermediate annealing equipment for gold-palladium-copper wire according to claim 1, characterized in that, The wire feeding unit includes a wire feeding frame, which is fixedly installed on the surface of the workbench. A wire feeding rod is rotatably connected inside the wire feeding frame, and a wire feeding wheel is fixedly installed on the outer wall of the wire feeding rod. A wire feeding synchronous wheel is also fixedly installed on the outer wall of the wire feeding rod. A second synchronous belt is meshed on the outer wall of the wire feeding synchronous wheel, and a sleeve is meshed on the inner wall of the other side of the second synchronous belt.

7. The continuous intermediate annealing equipment for gold-palladium-copper wire according to claim 6, characterized in that, The upper part of the wire feeding frame is rotatably connected to an upper adjustment wheel, and the top of the upper adjustment wheel is fixedly connected to an operating end, which is located above the wire feeding frame. The outer wall of the wire feeding rod is also fixedly installed with a first gear plate, and the top of the first gear plate is meshed with a second gear plate. The second gear plate is rotatably connected to one side of the wire feeding frame, and the other side of the second gear plate is fixedly connected with a wire feeding guide wheel, which is located above the wire feeding wheel.

8. The continuous intermediate annealing equipment for gold-palladium-copper wire according to claim 1, characterized in that, The take-up unit includes a take-up frame, which is fixedly installed on the surface of the workbench. A take-up rod is rotatably connected inside the take-up frame, and a take-up wheel is fixedly installed on the outer wall of the take-up rod. The outer wall of the take-up rod is also fixedly installed with a take-up synchronous pulley, and the outer wall of the take-up synchronous pulley is engaged with a first synchronous belt, and the inner wall of the other end of the first synchronous belt is engaged with a meshing pulley.

9. A continuous intermediate annealing equipment for gold-palladium-copper wire according to claim 8, characterized in that, The upper part of the take-up frame is rotatably connected to an upper pressure wheel, and the top of the upper pressure wheel is fixedly connected to an operating end, which is located above the take-up frame. A third gear plate is fixedly installed on the outer wall of the take-up rod, and a fourth gear plate is meshed with the top of the third gear plate. The fourth gear plate is rotatably connected to one side of the take-up frame, and a take-up guide wheel is fixedly connected to the other side of the fourth gear plate, with the take-up guide wheel located above the take-up wheel.

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