A processing device and process for wire bonding of five-metallic bullet

Abstract

This invention relates to the field of welding processing equipment technology, and discloses a processing device for wire bonding of metal spring sheets. The device includes a first support block, a blocking mechanism, a limiting mechanism, two U-shaped blocks, a top block connected to the top of the U-shaped blocks via a support member, a first groove opened at the upper end of the top block, a solder column feeding groove communicating with the first groove, a first limiting block, a second limiting block, a pressure sensor, a solder column feeding and cutting mechanism, a wire limiting assembly, a solder column guiding mechanism, and a welding mechanism. The top block is inverted U-shaped, with its concave surface fitting against the U-shaped spring sheet body. The welding feet of the U-shaped spring sheet body are slidably disposed in the concave part of the U-shaped block. The blocking mechanism and the limiting mechanism respectively abut against both ends of the U-shaped spring sheet body. This invention has the advantages of high automation, precise welding positioning, fixed-length solder column feeding and cutting, and stable welding quality, solving the problems of low efficiency and poor consistency in manual welding.

Description

Technical Field

[0001] This invention relates to the field of welding processing equipment technology, specifically to a processing device and process for welding wire on metal springs. Background Technology

[0002] In fields such as electronic components and hardware accessories, it is often necessary to solder wires to the surface of metal springs to form a conductive connection structure. Taking a U-shaped spring as an example, its two sides are usually equipped with soldering feet. Wires with pre-set terminals need to be precisely soldered to the soldering feet to ensure the reliability and consistency of the electrical connection.

[0003] Currently, such welding operations are mostly carried out manually. Operators hold soldering irons and solder wires, sequentially completing steps such as spring positioning, wire alignment, solder feeding, and heating. However, existing technologies have the following problems in practical applications: First, manual operation is inefficient, making it difficult to meet the needs of mass production. Furthermore, welding quality is greatly affected by the operator's skill level, resulting in high rates of defects such as inconsistent solder joint size, cold solder joints, and missed solder joints. Second, the positioning of springs and wires relies on fixtures or manual visual inspection, lacking precise mechanical limits, making it difficult to guarantee the fit between the welding feet and the pre-set terminals. Third, the solder feeding length relies on manual estimation, leading to unstable solder usage and easily causing too much or too little solder, affecting welding strength and appearance. Fourth, the entire welding process lacks automated linkage control, resulting in poor coordination between processes, cumbersome operation, and high labor intensity.

[0004] Therefore, how to design a processing device that can realize automatic positioning of spring pieces, precise alignment of wires, fixed-length feeding of solder, and automatic welding has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] The purpose of this invention is to provide a processing device for wire bonding of metal springs, which has the advantages of high automation, precise welding positioning, fixed-length feeding and cutting of solder pillars, and stable welding quality, thus solving the problems in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A processing device for wire bonding of metal spring sheets includes a U-shaped first support block, a blocking mechanism fixedly connected to one side of the first support block, a limiting mechanism fixedly connected to the other side of the first support block, two U-shaped blocks fixedly connected to the two ends of the upper end of the first support block and arranged opposite to each other, a top block fixedly connected to the two U-shaped blocks by two support members, a first groove opened at the upper end of the top block, a solder column feeding groove penetrating one end of the top block and communicating with the first groove, a first limiting block fixedly connected to the upper end of the two U-shaped blocks, a second limiting block fixedly connected to the upper end of the two U-shaped blocks, a pressure sensor fixedly connected to the second limiting block near the end of the top block, a solder column feeding and cutting mechanism fixedly connected to the upper end of the top block, a wire limiting assembly fixedly connected to the upper end of the U-shaped blocks, a solder column guiding mechanism fixedly connected to the upper end of the two U-shaped blocks, and a welding mechanism fixedly connected to the upper end of the U-shaped blocks. The top block is inverted U-shaped, with its concave surface fitting against a portion of the upper end face and both sides of the U-shaped spring body; the U-shaped spring body is inverted U-shaped, with welding feet fixedly connected to both sides, each welding foot slidingly positioned in the corresponding U-shaped block's recess, and both sides of the U-shaped spring body fitting against the adjacent ends of the two U-shaped blocks; the blocking mechanism and the limiting mechanism abut against both ends of the U-shaped spring body; a solder column is slidably positioned in the solder column feeding groove; a gap is left between the adjacent ends of the two first limiting blocks for the solder column to pass through; a pressure sensor is positioned directly opposite the solder column and electrically connected to the solder column feeding and cutting mechanism.

[0007] Preferably, the blocking mechanism includes a base block fixedly connected to one side of the first support block, a first electric cylinder fixedly connected to the upper end of the base block, and a blocking block fixedly connected to the upper end of the output shaft of the first electric cylinder; one end of the blocking block near the center of the first support block abuts against one end of the U-shaped spring body.

[0008] It is worth noting that the blocking mechanism uses a first electric cylinder to drive the blocking block to rise and fall vertically. In conjunction with the limiting mechanism, it realizes the axial clamping and release of the U-shaped spring body. The planar contact between the blocking block and the end of the spring avoids the deformation or damage of the spring that may be caused by point contact, and ensures the uniform distribution of clamping force.

[0009] Preferably, the limiting mechanism includes a first fixing block fixedly connected to the other side of the first support block, a second electric cylinder fixedly connected to the first fixing block, and a pressure plate fixedly connected to the output shaft of the second electric cylinder; one end of the pressure plate near the center of the first support block abuts against the other end of the U-shaped spring body.

[0010] It is worth noting that the limiting mechanism drives the pressure plate to move horizontally through the second electric cylinder, applying lateral clamping force from the other end of the spring sheet. Together with the blocking mechanism, it forms a bidirectional clamping. The contact area between the pressure plate and the end of the spring sheet is optimized to provide sufficient friction to prevent the spring sheet from loosening, without causing indentations on the surface of the spring sheet. After welding, the mechanism can quickly retract, making it easy to remove the finished product, greatly shortening auxiliary time and improving the efficiency of mass production.

[0011] Preferably, the support is a second support block, and two second support blocks are fixedly connected to the upper ends of two U-shaped blocks respectively. The ends of the two second support blocks that are close to each other are fixedly connected to the two sides of the top block. Two first arc-shaped blocks are fixedly connected to the inner wall of the first groove, and an air heating rod is fixedly connected to each first arc-shaped block.

[0012] It is worth noting that the top block is mounted on top of the U-shaped block by the second support block, forming a stable gantry support structure, which ensures the relative positional accuracy between the top block and the U-shaped block. The first arc-shaped block set on the inner wall of the first tank is used to fix the air heating rod, so that the heating rod is arranged around the solder pillar and fed into the tank. This can preheat the solder pillar before it is fed downward. The preheating treatment can reduce the hardness of the oxide film on the surface of the solder pillar and improve its smoothness during the meshing transmission of the gear block. At the same time, the preheated solder pillar requires a shorter heating time and a more uniform temperature during subsequent melting and welding, which is beneficial to improving the wettability and density of the solder joint and reducing the probability of cold soldering or porosity defects.

[0013] Preferably, it also includes a controller, and a first bracket is fixedly connected to the side wall of the first support block, and the controller is fixedly connected to the first bracket; the controller is electrically connected to the pressure sensor, the blocking mechanism, the limiting mechanism, the solder column feeding and cutting mechanism, the wire limiting assembly, the solder column guiding mechanism and the welding mechanism respectively.

[0014] It is worth noting that the controller, as the control center of the entire device, integrates the timing logic control and closed-loop feedback adjustment functions of each electric cylinder, motor, pressure sensor and heating element. Through the preset program, the controller can automatically complete the entire process of spring clamping, wire positioning, solder column fixed length feeding, cutting, guide step placement and electrothermal pressing welding without manual intervention. The signal of the pressure sensor is fed back to the controller in real time, realizing precise closed-loop control of the solder column feeding length and avoiding the cumulative error that may be caused by open-loop control.

[0015] Preferably, the solder pillar feeding and cutting mechanism includes a second bracket fixedly connected to the upper end of the top block, a third electric cylinder fixedly connected to the second bracket, a first lifting block fixedly connected to the lower end of the output shaft of the third electric cylinder, and a cutter fixedly connected to the lower end of the first lifting block; the solder pillar feeding and cutting mechanism also includes a second fixing block fixedly connected to the side wall of the second bracket, a first motor fixedly connected to the second fixing block, a turntable fixedly connected to the lower end of the output shaft of the first motor, and a plurality of toothed blocks uniformly fixedly connected along the outer peripheral wall of the turntable; the outer peripheral wall of the solder pillar is provided with a plurality of equally spaced grooves, and the toothed blocks mesh with the grooves.

[0016] It is worth noting that this feeding and cutting mechanism adopts a ratchet-type transmission principle where toothed blocks mesh with grooves on the outer periphery of the solder pillar. This achieves forced downward quantitative feeding of the circular solder pillar. Compared to the roller feeding method that relies on frictional pushing, the meshing transmission between the toothed blocks and the grooves eliminates slippage, and the feeding length is precisely controllable. A pressure sensor is located at the end point of the solder pillar's feeding. When the end of the solder pillar contacts the sensor and reaches a preset pressure threshold, the controller immediately stops the first motor and starts the third electric cylinder to drive the cutter to cut, thus obtaining solder segments of uniform length. This combination of "fixed-length feeding + pressure feedback cutting" design ensures that the amount of solder used at each welding station is exactly the same, solving the problem of uneven solder usage caused by manual feeding.

[0017] Preferably, the second limiting block and the two first limiting blocks are opposite each other in the horizontal direction.

[0018] It is worth noting that the second limiting block and the two first limiting blocks form a three-point positioning structure in the horizontal direction, which together define the guide channel between the solder column and the solder column feeding tank outlet and the unloading hopper inlet. This design allows the cut solder column to fall stably along the gap between the first and second limiting blocks under the action of gravity, without lateral deflection or jamming. At the same time, the width of the gap is limited to just enough to accommodate the solder column, effectively preventing the solder column from flipping or jumping out of the predetermined track during the fall. This provides an accurate positional basis for the subsequent pushing of the rotating column and the fixed plate. The structure is simple and compact, and can achieve orderly transmission of the solder column without additional guide pipes.

[0019] Preferably, the wire limiting assembly includes two third brackets fixedly connected to the upper end of the U-shaped block, a fourth electric cylinder fixedly connected to each third bracket, a second lifting block fixedly connected to the lower end of the output shaft of the fourth electric cylinder, and a third limiting block fixedly connected to the side wall of the second lifting block; a wire feeding groove is provided through the upper end of the U-shaped block, and the wire feeding groove extends through one side of the U-shaped block; the ends of the two third limiting blocks that are far apart from each other are respectively attached to the two sides of the inner wall of the wire feeding groove; the bottom surface of the wire feeding groove is flush with the upper surface of the welding foot plate.

[0020] It is worth noting that the wire limiting assembly, driven by a fourth electric cylinder, vertically enters the wire feeding groove, clamping and positioning the wire on both sides. The sides of the two third limiting blocks, which are far apart from each other, are in contact with the inner wall of the wire feeding groove, ensuring the guiding accuracy and stability of the limiting blocks during lifting. The bottom surface of the wire feeding groove is designed to be flush with the upper surface of the welding foot plate, allowing the lower surface of the pre-placed terminal to achieve surface contact with the upper surface of the welding foot plate, avoiding incomplete contact caused by height differences. This assembly remains clamped during welding, effectively suppressing displacement of the wire due to thermal expansion and contraction or the surface tension of molten solder, ensuring accurate solder joint positioning.

[0021] Preferably, the solder pillar guiding mechanism includes a fourth bracket fixedly connected to the upper end of the second limiting block, a second motor fixedly connected to the fourth bracket, a rotating column fixedly connected to the output shaft of the second motor, and a plurality of fixed plates uniformly fixedly connected along the outer peripheral wall of the rotating column; the rotating column and the fixed plates are both located in the space between the two first limiting blocks and the second limiting block; the solder pillar guiding mechanism also includes a feeding hopper fixedly connected between the first limiting block and the second limiting block on the same side, a second groove body penetrating and opened at the lower end of the feeding hopper, and a rotating column rotatably installed on the inner wall of the second groove body. The rotating plate and the rotary motor are fixedly connected to the side wall of the hopper. The output shaft of the rotary motor passes through the hopper and is fixedly connected to the rotating shaft of the rotating plate. The welding mechanism includes a second arc-shaped block fixedly connected to the upper end of the U-shaped block, a bearing block fixedly connected to one end of the second arc-shaped block near the second limiting block, a fifth electric cylinder fixedly connected to the upper end of the second arc-shaped block, and an electrothermal pressing welding head fixedly connected to the lower end of the output shaft of the fifth electric cylinder. The output shaft of the fifth electric cylinder passes downward through the second arc-shaped block and the bearing block. The axis of the electrothermal pressing welding head coincides with the central axis of the wire feeding groove.

[0022] It is worth noting that the solder pillar guiding mechanism realizes the automatic step-by-step placement of the solder pillar after cutting: the first section of the solder pillar is pushed into the feeding hopper by the fixed plate, and the rotating plate is tilted by the rotating motor so that the solder pillar slides to the left side of the preset terminal; after the second section of the solder pillar is pushed in the same way, the rotating plate returns to the horizontal state, and the solder pillar slides down the inclined surface of the feeding hopper to the right side of the preset terminal, thus forming a portion of solder on each side of the terminal. This structure replaces the tedious operation of manually picking up the solder pillar with tweezers and placing it, and the symmetrical placement on both sides ensures that the molten solder can evenly wrap the side wall of the terminal during welding, forming a relatively full rounded solder joint. The electrothermal pressing welding head of the welding mechanism is coaxially set with the wire feeding groove, ensuring that the pressing direction coincides with the wire axis, effectively avoiding terminal tilting or solder extrusion caused by bias.

[0023] The present invention also provides a processing technology for wire bonding of metal springs, which uses the processing apparatus for wire bonding of metal springs as described above, and includes the following steps: S1. Place the U-shaped spring body between two U-shaped blocks, and slide the welding foot plate in the recess of the U-shaped block. Start the first electric cylinder to drive the blocking block to rise, and start the second electric cylinder to drive the pressure plate to move, respectively abutting against the two ends of the U-shaped spring body, to complete the axial positioning and clamping of the U-shaped spring body. S2. Place the wire body with the pre-set terminal fixed at the end into the wire feeding groove, adjust the position of the wire body so that the lower end face of the pre-set terminal is completely in contact with the upper end face of the welding foot plate, start the fourth electric cylinder to drive the second lifting block and the third limiting block to move downward into the wire feeding groove, so that the two third limiting blocks are close to each other and in contact with the outer peripheral walls of the wire body, thus completing the positioning of the wire body and the pre-set terminal. S3. Start the air heating rod to preheat the solder column into the solder column tank, start the first motor to drive the turntable to rotate, and drive the solder column to move straight down along the solder column feeding tank through the meshing transmission of the tooth block and the groove. S4. When the lower end of the solder column is pressed to the pressure sensor to the preset pressure value, the controller automatically controls the first motor to stop rotating and starts the third electric cylinder to drive the first lifting block and the cutter to move downward, thus completing the fixed-length cutting of the first section of the solder column. S5. Start the second motor to drive the rotating column and the fixed plate to rotate, so that the cut first section of solder column enters the feeding hopper through the upper end face of the U-shaped spring body as the moving slide; start the rotary motor to drive the rotating plate to rotate to the inclined state, so that the first section of solder column slides down the inclined surface of the rotating plate to the left side of the preset terminal. S6. Restart the first motor to drive the turntable to rotate. Through the meshing transmission between the toothed block and the groove, the solder column is sent into the groove and continues to move downward in a straight line. When the lower end of the solder column presses the pressure sensor to the preset pressure value again, the controller automatically controls the first motor to stop rotating. At the same time, the third electric cylinder is started to drive the first lifting block and the cutter to move downward, completing the fixed-length cutting of the second section of the solder column. S7. Start the second motor to drive the rotating column and the fixed plate to rotate, and push the cut second section of solder column into the feeding hopper; start the rotary motor to drive the rotating plate to reset to a state flush with the inner wall of the feeding hopper, so that the second section of solder column slides down along the inclined surface of the feeding hopper and the upper end surface of the rotating plate to the right side of the preset terminal, thereby placing a solder column on each side of the preset terminal. S8. Start the fifth electric cylinder to drive the electrothermal pressing head to press downward with a constant pressure of 2-5N. At the same time, heat the electrothermal pressing head to 260-280℃ so that the two solder pillars on both sides of the pre-positioned terminal are completely melted. The molten solder evenly wraps the side wall of the pre-positioned terminal and fully wets the upper surface of the welding foot plate. S9. Keep the pressure of the electrothermal pressing welding head unchanged, stop heating the electrothermal pressing welding head, and after the weld point cools and solidifies naturally, start the fifth electric cylinder to drive the electrothermal pressing welding head to rise and reset. S10. The fourth electric cylinder is activated in sequence to drive the third limit block to rise and exit the wire feeding groove, the second electric cylinder is activated to drive the pressure plate to move backward, and the first electric cylinder is activated to drive the blocking block to descend, thereby releasing the clamping of the U-shaped spring body and the wire body, and taking out the welded U-shaped spring body.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention achieves precise positioning of the U-shaped spring body by setting an inverted U-shaped top block that fits into the upper part of the U-shaped spring body and both sides, combined with the sliding support of the welding foot plate by two U-shaped blocks, and the clamping and abutting of the two ends of the spring by the blocking mechanism and the limiting mechanism. This solves the problems of inaccurate positioning and easy displacement of the spring in the prior art, and provides a stable reference for subsequent welding. 2. This invention sets up a solder column feeding and cutting mechanism, which uses a first motor to drive a turntable and a toothed block to mesh with the groove on the solder column to achieve fixed-length feeding of the solder column. Combined with the pressure feedback control of the pressure sensor to cut the cutter, it realizes the automated quantitative supply of solder column, solves the problems of unstable solder consumption and inconsistent cutting when manually feeding, and ensures the precise control of the amount of solder used in the solder joint. 3. This invention sets up a wire limiting component, which uses a fourth electric cylinder to drive the third limiting block downward into the wire feeding groove, clamping and positioning the wire body on both sides, and ensuring that the bottom surface of the wire feeding groove is flush with the upper surface of the welding foot plate, so that the lower surface of the pre-placed terminal is completely in contact with the upper surface of the welding foot plate, thus solving the problems of difficult wire alignment and poor contact between the terminal and the welding foot plate, and improving the welding contact quality. 4. This invention sets up a solder pillar guiding mechanism, which uses a second motor to drive the rotating pillar and the fixed plate to rotate, and pushes the cut solder pillars to both sides of the preset terminal in sequence. The rotating plate driven by the rotary motor realizes the directional sliding of the solder pillars, realizing the automatic step-by-step placement of double solder pillars, and solving the problems of low efficiency and inaccurate positioning of manual solder pillar placement. 5. This invention achieves fully automated control of the entire process of spring clamping, wire positioning, solder feeding and cutting, solder pillar guiding and pushing, and electrothermal pressing and welding through the electrical connection of the controller with pressure sensor, each electric cylinder and each motor. This significantly improves processing efficiency and welding consistency, and reduces manual operation intensity and defect rate. Attached Figure Description

[0025] Figure 1 The diagram shown is a three-dimensional structural schematic of the present invention; Figure 2The diagram shown is a three-dimensional structural schematic of the blocking mechanism of the present invention; Figure 3 The diagram shown is a three-dimensional structural schematic of the U-shaped spring body of the present invention; Figure 4 The diagram shown is a three-dimensional structural schematic of the limiting mechanism of the present invention; Figure 5 The diagram shown is a three-dimensional structural schematic of the solder pillar feeding and cutting mechanism of the present invention. Figure 6 The diagram shown is a three-dimensional structural schematic of the solder pillar of the present invention; Figure 7 The present invention is shown Figure 5 A magnified three-dimensional structural diagram of a portion at point A in the middle; Figure 8 The present invention is shown Figure 5 A magnified three-dimensional structural diagram of a portion at point B in the middle; Figure 9 The diagram shown is a three-dimensional structural schematic of the entire invention. Figure 10 The present invention is shown Figure 9 Enlarged three-dimensional structural diagram of part C in the middle; Figure 11 The diagram shown is a three-dimensional structural schematic of the solder pillar guiding mechanism of the present invention; Figure 12 The diagram shown is a three-dimensional structural schematic of the first limiting block and the second limiting block of the present invention.

[0026] Reference numerals: 1. First support block; 101. Pressure sensor; 2. Blocking mechanism; 201. Bottom block; 202. First electric cylinder; 203. Blocking block; 3. U-shaped block; 4. Second support block; 5. Top block; 6. First groove; 7. First arc-shaped block; 8. Air heating rod; 9. First limiting block; 10. Second limiting block; 11. Wire feeding groove; 12. Solder pillar feeding groove; 13. U-shaped spring body; 14. Welding foot plate; 15. Limiting mechanism; 1501. First fixing block; 1502. Second electric cylinder; 1503. Pressure plate; 16. First bracket; 17. Controller; 18. Second bracket; 19. Third electric cylinder; 20. First lifting block; 21. Cutting knife; 22. Second fixing block; 23. First motor; 24. Turntable; 25. Tooth block; 26. Solder column; 27. Groove; 28. Third bracket; 29. ​​Fourth electric cylinder; 30. Second lifting block; 31. Third limiting block; 32. Fourth bracket; 33. Second motor; 34. Rotating column; 35. Fixing plate; 36. Feed hopper; 37. Second trough; 38. Rotating plate; 39. Rotary motor; 40. Second arc-shaped block; 41. Bearing block; 42. Fifth electric cylinder; 43. Electrothermal pressing welding head; 44. Wire body; 45. Pre-set terminal. Detailed Implementation

[0027] 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, and 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.

[0028] To address the problems of inaccurate spring positioning, difficulty in wire alignment, unstable solder feeding, and poor soldering consistency in existing technologies, the following technical solution is proposed. Please refer to [link / reference needed]. Figures 1-12 ; A processing device for wire bonding of metal spring sheets includes a U-shaped first support block 1, a blocking mechanism 2 fixedly connected to one side of the first support block 1, a limiting mechanism 15 fixedly connected to the other side of the first support block 1, two U-shaped blocks 3 respectively fixedly connected to the two ends of the upper end of the first support block 1 and arranged opposite to each other, a top block 5 fixedly connected to the top of the two U-shaped blocks 3 by two support members, a first groove 6 opened at the upper end of the top block 5, a solder column feeding groove 12 penetrating one end of the top block 5 and communicating with the first groove 6, a first limiting block 9 fixedly connected to the upper end of the two U-shaped blocks 3, a second limiting block 10 fixedly connected to the upper end of the two U-shaped blocks 3, a pressure sensor 101 fixedly connected to the second limiting block 10 near the end of the top block 5, a solder column feeding and cutting mechanism fixedly connected to the upper end of the top block 5, a wire limiting assembly fixedly connected to the upper end of the U-shaped blocks 3, a solder column guiding mechanism fixedly connected to the upper end of the two U-shaped blocks 3, and a welding mechanism fixedly connected to the upper end of the U-shaped blocks 3.

[0029] In this embodiment, specifically, the top block 5 is inverted U-shaped, and its concave surface is in contact with a portion of the upper end surface and both sides of the U-shaped spring body 13; the U-shaped spring body 13 is inverted U-shaped, and welding feet 14 are fixedly connected to both sides of it. Each welding foot 14 is slidably disposed in the recess of the corresponding U-shaped block 3, and the two sides of the U-shaped spring body 13 are respectively in contact with the two U-shaped blocks 3 at their respective close ends; the blocking mechanism 2 and the limiting mechanism 15 are respectively abutted against the two ends of the U-shaped spring body 13; a solder column 26 is slidably disposed in the solder column feeding groove 12; a gap is left between the two first limiting blocks 9 at their respective close ends for the solder column 26 to pass through; the pressure sensor 101 is disposed opposite the solder column 26 and is electrically connected to the solder column feeding and cutting mechanism.

[0030] In this embodiment, specifically, the blocking mechanism 2 includes a bottom block 201 fixedly connected to one side of the first support block 1, a first electric cylinder 202 fixedly connected to the upper end of the bottom block 201, and a blocking block 203 fixedly connected to the upper end of the output shaft of the first electric cylinder 202; one end of the blocking block 203 near the center of the first support block 1 abuts against one end of the U-shaped spring body 13.

[0031] In this embodiment, specifically, the limiting mechanism 15 includes a first fixing block 1501 fixedly connected to the other side of the first support block 1, a second electric cylinder 1502 fixedly connected to the first fixing block 1501, and a pressure plate 1503 fixedly connected to the output shaft of the second electric cylinder 1502; one end of the pressure plate 1503 near the center of the first support block 1 abuts against the other end of the U-shaped spring body 13.

[0032] In this embodiment, specifically, the support member is a second support block 4, and the two second support blocks 4 are respectively fixedly connected to the upper ends of the two U-shaped blocks 3. The ends of the two second support blocks 4 that are close to each other are fixedly connected to the two sides of the top block 5. The inner wall of the first groove 6 is fixedly connected to two first arc-shaped blocks 7, and an air heating rod 8 is fixedly connected to each first arc-shaped block 7.

[0033] In this embodiment, specifically, the device also includes a controller 17. A first bracket 16 is fixedly connected to the side wall of the first support block 1, and the controller 17 is fixedly connected to the first bracket 16. The controller 17 is electrically connected to the pressure sensor 101, the blocking mechanism 2, the limiting mechanism 15, the solder pillar feeding and cutting mechanism, the wire limiting assembly, the solder pillar guiding mechanism, and the welding mechanism, respectively.

[0034] In this embodiment, specifically, the solder pillar feeding and cutting mechanism includes a second bracket 18 fixedly connected to the upper end of the top block 5, a third electric cylinder 19 fixedly connected to the second bracket 18, a first lifting block 20 fixedly connected to the lower end of the output shaft of the third electric cylinder 19, and a cutter 21 fixedly connected to the lower end of the first lifting block 20; the solder pillar feeding and cutting mechanism also includes a second fixing block 22 fixedly connected to the side wall of the second bracket 18, a first motor 23 fixedly connected to the second fixing block 22, a turntable 24 fixedly connected to the lower end of the output shaft of the first motor 23, and a plurality of toothed blocks 25 uniformly fixedly connected along the outer peripheral wall of the turntable 24; the outer peripheral wall of the solder pillar 26 is provided with a plurality of equally spaced grooves 27, and the toothed blocks 25 mesh with the grooves 27.

[0035] In this embodiment, specifically, the second limiting block 10 and the two first limiting blocks 9 correspond to each other in the horizontal direction.

[0036] In this embodiment, specifically, the wire limiting assembly includes two third brackets 28 fixedly connected to the upper end of the U-shaped block 3, a fourth electric cylinder 29 fixedly connected to each third bracket 28, a second lifting block 30 fixedly connected to the lower end of the output shaft of the fourth electric cylinder 29, and a third limiting block 31 fixedly connected to the side wall of the second lifting block 30; a wire feeding groove 11 is provided through the upper end of the U-shaped block 3, and the wire feeding groove 11 passes through one side of the U-shaped block 3; the ends of the two third limiting blocks 31 that are far apart from each other are respectively attached to the two sides of the inner wall of the wire feeding groove 11; the bottom surface of the wire feeding groove 11 is flush with the upper surface of the welding foot plate 14.

[0037] In this embodiment, specifically, the solder pillar guiding mechanism includes a fourth bracket 32 ​​fixedly connected to the upper end of the second limiting block 10, a second motor 33 fixedly connected to the fourth bracket 32, a rotating column 34 fixedly connected to the output shaft of the second motor 33, and a plurality of fixed plates 35 uniformly fixedly connected along the outer peripheral wall of the rotating column 34; the rotating column 34 and the fixed plates 35 are both located in the space between the two first limiting blocks 9 and the second limiting block 10; the solder pillar guiding mechanism also includes a feeding hopper 36 fixedly connected between the first limiting block 9 and the second limiting block 10 on the same side, a second groove 37 penetrating and opened at the lower end of the feeding hopper 36, and a rotating column 34 rotatably installed on the inner wall of the second groove 37. The rotating plate 38 and the rotary motor 39 are fixedly connected to the side wall of the hopper 36. The output shaft of the rotary motor 39 passes through the hopper 36 and is fixedly connected to the rotating shaft of the rotating plate 38. The welding mechanism includes a second arc-shaped block 40 fixedly connected to the upper end of the U-shaped block 3, a bearing block 41 fixedly connected to the end of the second arc-shaped block 40 near the second limiting block 10, a fifth electric cylinder 42 fixedly connected to the upper end of the second arc-shaped block 40, and an electrothermal pressing welding head 43 fixedly connected to the lower end of the output shaft of the fifth electric cylinder 42. The output shaft of the fifth electric cylinder 42 passes downward through the second arc-shaped block 40 and the bearing block 41. The axis of the electrothermal pressing welding head 43 coincides with the central axis of the wire feeding groove 11.

[0038] The present invention also provides a processing technology for wire bonding of metal springs, which uses the processing apparatus for wire bonding of metal springs as described above, and includes the following steps: S1. Place the U-shaped spring body 13 between two U-shaped blocks 3, and slide the welding foot plate 14 in the recess of the U-shaped block 3. Start the first electric cylinder 202 to drive the blocking block 203 to rise, and start the second electric cylinder 1502 to drive the pressure plate 1503 to move, respectively abutting against the two ends of the U-shaped spring body 13, to complete the axial positioning and clamping of the U-shaped spring body 13. S2. Place the wire body 44 with the pre-set terminal 45 fixed at the end into the wire feeding groove 11, adjust the position of the wire body 44 so that the lower end face of the pre-set terminal 45 is completely in contact with the upper end face of the welding foot plate 14, start the fourth electric cylinder 29 to drive the second lifting block 30 and the third limiting block 31 to move downward into the wire feeding groove 11, so that the two third limiting blocks 31 are close to each other and in contact with the outer peripheral walls of the wire body 44, thus completing the positioning of the wire body 44 and the pre-set terminal 45. S3. Start the air heating rod 8 to preheat the solder column 26 in the solder column feeding tank 12, start the first motor 23 to drive the turntable 24 to rotate, and drive the solder column 26 to move downward in a straight line along the solder column feeding tank 12 through the meshing transmission of the tooth block 25 and the groove 27. S4. When the lower end of the solder column 26 presses the pressure sensor 101 to the preset pressure value, the controller 17 automatically controls the first motor 23 to stop rotating, and at the same time starts the third electric cylinder 19 to drive the first lifting block 20 and the cutter 21 to move downward, completing the fixed-length cutting of the first section of the solder column 26. S5. Start the second motor 33 to drive the rotating column 34 and the fixed plate 35 to rotate, so that the cut first section of solder column 26 enters the unloading hopper 36 with the upper end face of the U-shaped spring body 13 as the moving slide; start the rotary motor 39 to drive the rotating plate 38 to rotate to the inclined state, so that the first section of solder column 26 slides down the inclined surface of the rotating plate 38 to the left side of the preset terminal 45; S6. Restart the first motor 23 to drive the turntable 24 to rotate. Through the meshing transmission of the toothed block 25 and the groove 27, drive the solder column 26 to continue to move downward in a straight line along the solder column into the groove 12. When the lower end of the solder column 26 presses the pressure sensor 101 to the preset pressure value again, the controller 17 automatically controls the first motor 23 to stop rotating. At the same time, start the third electric cylinder 19 to drive the first lifting block 20 and the cutter 21 to move downward, completing the fixed-length cutting of the second section of the solder column 26. S7. Start the second motor 33 to drive the rotating column 34 and the fixed plate 35 to rotate, and push the cut second section of solder column 26 into the feeding hopper 36; start the rotary motor 39 to drive the rotating plate 38 to reset to a state flush with the inner wall of the feeding hopper 36, so that the second section of solder column 26 slides down along the inclined surface of the feeding hopper 36 and the upper end surface of the rotating plate 38 to the right side of the preset terminal 45, thereby placing a solder column 26 on each side of the preset terminal 45; S8. Start the fifth electric cylinder 42 to drive the electrothermal pressing welding head 43 to press downward with a constant pressure of 2-5N. At the same time, heat the electrothermal pressing welding head 43 to 260-280℃, so that the two solder pillars 26 on both sides of the pre-positioned terminal 45 are completely melted. The molten solder evenly wraps the side wall of the pre-positioned terminal 45 and fully wets the upper surface of the welding foot plate 14. S9. Keep the pressure of the electrothermal pressing welding head 43 unchanged, stop heating the electrothermal pressing welding head 43, and after the weld point cools and solidifies naturally, start the fifth electric cylinder 42 to drive the electrothermal pressing welding head 43 to rise and reset. S10. The fourth electric cylinder 29 is started in sequence to drive the third limit block 31 to rise and exit the wire feeding groove 11. The second electric cylinder 1502 is started to drive the pressure plate 1503 to move backward. The first electric cylinder 202 is started to drive the blocking block 203 to descend, thereby releasing the clamping of the U-shaped spring body 13 and the wire body 44, and taking out the welded U-shaped spring body 13.

[0039] Working principle: In use, first place the U-shaped spring body 13 between two U-shaped blocks 3, so that the welding foot plate 14 is slidably set in the recess of the U-shaped block 3. The two sides of the U-shaped spring body 13 are in contact with the two U-shaped blocks 3 at their close ends. The inverted U-shaped concave surface of the top block 5 is in contact with part of the upper end surface and the two sides of the U-shaped spring body 13. The controller 17 controls the first electric cylinder 202 to start, driving the blocking block 203 to rise. At the same time, it controls the second electric cylinder 1502 to start, driving the pressure plate 1503 to move. The blocking block 203 and the pressure plate 1503 respectively abut against the two ends of the U-shaped spring body 13, completing the axial positioning and clamping of the U-shaped spring body 13. Then, the wire body 44 with the pre-set terminal 45 fixed at the end is placed into the wire feeding groove 11. The position of the wire body 44 is adjusted so that the lower end face of the pre-set terminal 45 is completely in contact with the upper end face of the welding foot plate 14. The controller 17 controls the fourth electric cylinder 29 to start, driving the second lifting block 30 and the third limiting block 31 to move downward into the wire feeding groove 11, so that the two third limiting blocks 31 are close to each other and are in contact with the outer peripheral walls of the wire body 44, thus completing the positioning of the wire body 44 and the pre-set terminal 45. Next, the controller 17 starts the air heating rod 8 to preheat the solder column 26 in the solder column feeding tank 12. The controller 17 starts the first motor 23 to drive the turntable 24 to rotate. Through the meshing transmission between the tooth block 25 and the groove 27, the solder column 26 is driven to move downward in a straight line along the solder column feeding tank 12. When the lower end of the solder column 26 presses the pressure sensor 101 to the preset pressure value, the controller 17 automatically controls the first motor 23 to stop rotating. At the same time, the third electric cylinder 19 is started to drive the first lifting block 20 and the cutter 21 to move downward, completing the fixed-length cutting of the first section of the solder column 26. The controller 17 starts the second motor 33, which drives the rotating column 34 and the fixed plate 35 to rotate, so that the cut first section of solder column 26 enters the feeding hopper 36 through the upper end face of the U-shaped spring body 13 as the moving slide. The controller 17 starts the rotary motor 39, which drives the rotating plate 38 to rotate to an inclined state, so that the first section of solder column 26 slides down the inclined surface of the rotating plate 38 to the left side of the preset terminal 45. Then, the controller 17 restarts the first motor 23, driving the solder column 26 to continue moving downward. When the lower end of the solder column 26 presses the pressure sensor 101 to the preset pressure value again, the controller 17 controls the first motor 23 to stop and starts the third electric cylinder 19 to drive the cutter 21 to complete the fixed-length cutting of the second section of the solder column 26. The controller 17 starts the second motor 33 to push the cut second section of the solder column 26 into the feeding hopper 36, and starts the rotary motor 39 to drive the rotating plate 38 to reset to a state flush with the inclined surface of the inner wall of the feeding hopper 36, so that the second section of the solder column 26 slides down along the inclined surface of the feeding hopper 36 and the upper end surface of the rotating plate 38 to the right side of the preset terminal 45, thereby placing a solder column 26 on each side of the preset terminal 45. Finally, the controller 17 activates the fifth electric cylinder 42, driving the electrothermal pressing head 43 to press downwards with a constant pressure of 2-5N. At the same time, the electrothermal pressing head 43 is heated to 260-280℃, so that the two solder pillars 26 on both sides of the pre-positioned terminal 45 are completely melted. The molten solder evenly wraps the side wall of the pre-positioned terminal 45 and fully wets the upper surface of the welding foot plate 14. The pressure of the electrothermal pressing head 43 is kept constant, heating is stopped, and after the solder joint cools and solidifies naturally, the controller 17 activates the fifth electric cylinder 42 to drive the electrothermal pressing head 43 to rise and reset. After welding is completed, the controller 17 sequentially starts the fourth electric cylinder 29 to drive the third limit block 31 to rise and exit the wire feeding groove 11, starts the second electric cylinder 1502 to drive the pressure plate 1503 to retreat, and starts the first electric cylinder 202 to drive the blocking block 203 to descend, thereby releasing the clamping of the U-shaped spring body 13 and the wire body 44, and taking out the welded U-shaped spring body 13 to complete one work cycle.

[0040] 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 process, method, article, or apparatus.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A processing apparatus for wire bonding of metal spring sheets, characterized in that, The system includes a U-shaped first support block (1), a blocking mechanism (2) fixedly connected to one side of the first support block (1), a limiting mechanism (15) fixedly connected to the other side of the first support block (1), two U-shaped blocks (3) fixedly connected to the two ends of the upper part of the first support block (1) and arranged opposite to each other, a top block (5) fixedly connected to the two U-shaped blocks (3) by two support members, a first groove (6) opened at the upper part of the top block (5), a solder column feeding groove (12) that passes through one end of the top block (5) and communicates with the first groove (6), a first limiting block (9) fixedly connected to the upper part of the two U-shaped blocks (3), a second limiting block (10) fixedly connected to the upper part of the two U-shaped blocks (3), a pressure sensor (101) fixedly connected to the second limiting block (10) near the end of the top block (5), a solder column feeding and cutting mechanism fixedly connected to the upper part of the top block (5), and a wire limiting assembly fixedly connected to the upper part of the U-shaped block (3). The top block (5) is inverted U-shaped, with its concave surface in contact with a portion of the upper surface and both sides of the U-shaped spring body (13); the U-shaped spring body (13) is inverted U-shaped, with welding feet (14) fixedly connected to both sides of the top block (3); each welding foot (14) is slidably set in the concave part of the corresponding U-shaped block (3); the top block (5) is inverted U-shaped, with welding feet (14) fixedly connected to both sides of the top block (3), and the top block (5) is inverted U-shaped, with welding feet (14) fixedly connected to both sides of the top block (3). The two sides are respectively attached to the ends of the two U-shaped blocks (3) that are close to each other; the blocking mechanism (2) and the limiting mechanism (15) respectively abut against the two ends of the U-shaped spring body (13); the solder column (26) is slidably arranged in the solder column feeding groove (12); a gap is left between the ends of the two first limiting blocks (9) that are close to each other for the solder column (26) to pass through; the pressure sensor (101) is set directly opposite the solder column (26) and is electrically connected to the solder column feeding and cutting mechanism.

2. The processing apparatus for wire bonding of metal spring sheets according to claim 1, characterized in that, The blocking mechanism (2) includes a bottom block (201) fixedly connected to one side of the first support block (1), a first electric cylinder (202) fixedly connected to the upper end of the bottom block (201), and a blocking block (203) fixedly connected to the upper end of the output shaft of the first electric cylinder (202); the end of the blocking block (203) near the center of the first support block (1) abuts against one end of the U-shaped spring body (13).

3. The processing apparatus for wire bonding of metal spring sheets according to claim 2, characterized in that, The limiting mechanism (15) includes a first fixing block (1501) fixedly connected to the other side of the first support block (1), a second electric cylinder (1502) fixedly connected to the first fixing block (1501), and a pressure plate (1503) fixedly connected to the output shaft of the second electric cylinder (1502); one end of the pressure plate (1503) near the center of the first support block (1) abuts against the other end of the U-shaped spring body (13).

4. The processing apparatus for wire bonding of metal spring sheets according to claim 3, characterized in that, The support is a second support block (4). The two second support blocks (4) are fixedly connected to the upper ends of the two U-shaped blocks (3). The two second support blocks (4) are close to each other and fixedly connected to the two sides of the top block (5). The inner wall of the first groove (6) is fixedly connected to two first arc-shaped blocks (7). Each first arc-shaped block (7) is fixedly connected to an air heating rod (8).

5. The processing apparatus for wire bonding of metal spring sheets according to claim 4, characterized in that, It also includes a controller (17), and a first bracket (16) is fixedly connected to the side wall of the first support block (1). The controller (17) is fixedly connected to the first bracket (16). The controller (17) is electrically connected to the pressure sensor (101), the blocking mechanism (2), the limiting mechanism (15), the solder column feeding and cutting mechanism, the wire limiting assembly, the solder column guiding mechanism and the welding mechanism respectively.

6. The processing apparatus for wire bonding of metal spring sheets according to claim 5, characterized in that, The solder column feeding and cutting mechanism includes a second bracket (18) fixedly connected to the upper end of the top block (5), a third electric cylinder (19) fixedly connected to the second bracket (18), a first lifting block (20) fixedly connected to the lower end of the output shaft of the third electric cylinder (19), and a cutter (21) fixedly connected to the lower end of the first lifting block (20); the solder column feeding and cutting mechanism also includes a second fixing block (22) fixedly connected to the side wall of the second bracket (18), a first motor (23) fixedly connected to the second fixing block (22), a turntable (24) fixedly connected to the lower end of the output shaft of the first motor (23), and multiple toothed blocks (25) evenly fixedly connected along the outer peripheral wall of the turntable (24); the outer peripheral wall of the solder column (26) is provided with multiple equally spaced grooves (27), and the toothed blocks (25) mesh with the grooves (27).

7. The processing apparatus for wire bonding of metal spring sheets according to claim 6, characterized in that, The second limiting block (10) and the two first limiting blocks (9) correspond to each other in the horizontal direction.

8. The processing apparatus for wire bonding of metal spring sheets according to claim 7, characterized in that, The wire limiting assembly includes two third brackets (28) fixedly connected to the upper end of the U-shaped block (3), a fourth electric cylinder (29) fixedly connected to each third bracket (28), a second lifting block (30) fixedly connected to the lower end of the output shaft of the fourth electric cylinder (29), and a third limiting block (31) fixedly connected to the side wall of the second lifting block (30); a wire feeding groove (11) is opened through the upper end of the U-shaped block (3), and the wire feeding groove (11) passes through one side of the U-shaped block (3); the ends of the two third limiting blocks (31) that are far apart from each other are respectively attached to the two sides of the inner wall of the wire feeding groove (11); the bottom surface of the wire feeding groove (11) is flush with the upper surface of the welding foot plate (14).

9. The processing apparatus for wire bonding of metal spring sheets according to claim 8, characterized in that, The solder pillar guiding mechanism includes a fourth bracket (32) fixedly connected to the upper end of the second limiting block (10), a second motor (33) fixedly connected to the fourth bracket (32), a rotating column (34) fixedly connected to the output shaft of the second motor (33), and multiple fixed plates (35) uniformly fixedly connected along the outer peripheral wall of the rotating column (34); the rotating column (34) and the fixed plates (35) are both located in the space between the two first limiting blocks (9) and the second limiting block (10); the solder pillar guiding mechanism also includes a feeding hopper (36) fixedly connected between the first limiting block (9) and the second limiting block (10) on the same side, a second groove (37) penetrating through the lower end of the feeding hopper (36), and a rotating plate (38) rotatably installed on the inner wall of the second groove (37). A rotary motor (39) is fixedly connected to the side wall of the hopper (36); the output shaft of the rotary motor (39) passes through the hopper (36) and is fixedly connected to the rotating shaft of the rotating plate (38); the welding mechanism includes a second arc-shaped block (40) fixedly connected to the upper end of the U-shaped block (3), a bearing block (41) fixedly connected to the end of the second arc-shaped block (40) near the second limiting block (10), a fifth electric cylinder (42) fixedly connected to the upper end of the second arc-shaped block (40), and an electrothermal pressing welding head (43) fixedly connected to the lower end of the output shaft of the fifth electric cylinder (42); the output shaft of the fifth electric cylinder (42) passes downward through the second arc-shaped block (40) and the bearing block (41); the axis of the electrothermal pressing welding head (43) coincides with the central axis of the wire feeding groove (11).

10. A processing technology for wire bonding of metal spring clips, characterized in that, Using the processing apparatus of claim 9 includes the following steps: S1. Place the U-shaped spring body (13) between two U-shaped blocks (3), and slide the welding foot plate (14) in the recess of the U-shaped block (3). Start the first electric cylinder (202) to drive the blocking block (203) to rise, and start the second electric cylinder (1502) to drive the pressure plate (1503) to move, and abut against the two ends of the U-shaped spring body (13) respectively, to complete the axial positioning and clamping of the U-shaped spring body (13); S2. Place the wire body (44) with the pre-set terminal (45) fixed at the end into the wire feeding groove (11), adjust the position of the wire body (44) so ​​that the lower end face of the pre-set terminal (45) is completely in contact with the upper end face of the welding foot plate (14), start the fourth electric cylinder (29) to drive the second lifting block (30) and the third limiting block (31) to move downward into the wire feeding groove (11), so that the two third limiting blocks (31) are close to each other and in contact with the outer peripheral walls of the wire body (44), thus completing the positioning of the wire body (44) and the pre-set terminal (45); S3. Start the air heating rod (8) to preheat the solder column (26) in the solder column feeding tank (12), start the first motor (23) to drive the turntable (24) to rotate, and drive the solder column (26) to move straight down along the solder column feeding tank (12) through the meshing transmission of the tooth block (25) and the groove (27); S4. When the lower end of the solder column (26) presses the pressure sensor (101) to the preset pressure value, the controller (17) automatically controls the first motor (23) to stop rotating, and at the same time starts the third electric cylinder (19) to drive the first lifting block (20) and the cutter (21) to move downward, thus completing the fixed-length cutting of the first section of the solder column (26). S5. Start the second motor (33) to drive the rotating column (34) and the fixed plate (35) to rotate, so that the cut first section of solder column (26) enters the unloading hopper (36) with the upper end face of the U-shaped spring body (13) as the moving slide; start the rotary motor (39) to drive the rotating plate (38) to rotate to the inclined state, so that the first section of solder column (26) slides down the inclined surface of the rotating plate (38) to the left side of the preset terminal (45); S6. Restart the first motor (23) to drive the turntable (24) to rotate. Through the meshing transmission of the tooth block (25) and the groove (27), the solder column (26) is driven to be fed into the groove (12) and continue to move downward in a straight line. When the lower end of the solder column (26) presses the pressure sensor (101) to the preset pressure value again, the controller (17) automatically controls the first motor (23) to stop rotating. At the same time, the third electric cylinder (19) is started to drive the first lifting block (20) and the cutter (21) to move downward, completing the fixed-length cutting of the second section of the solder column (26). S7. Start the second motor (33) to drive the rotating column (34) and the fixed plate (35) to rotate, and push the cut second section of solder column (26) into the feeding hopper (36); start the rotary motor (39) to drive the rotating plate (38) to reset to the state of being flush with the inner wall of the feeding hopper (36), so that the second section of solder column (26) slides down along the inclined surface of the feeding hopper (36) and the upper end surface of the rotating plate (38) to the right side of the preset terminal (45), thereby placing a solder column (26) on each side of the preset terminal (45). S8. Start the fifth electric cylinder (42) to drive the electrothermal pressing head (43) to press down with a constant pressure of 2-5N. At the same time, heat the electrothermal pressing head (43) to 260-280℃, so that the two solder pillars (26) on both sides of the pre-positioned terminal (45) are completely melted. The molten solder evenly wraps the side wall of the pre-positioned terminal (45) and fully wets the upper surface of the welding foot plate (14). S9. Keep the pressure of the electrothermal pressing welding head (43) unchanged, stop heating the electrothermal pressing welding head (43), and after the weld point cools and solidifies naturally, start the fifth electric cylinder (42) to drive the electrothermal pressing welding head (43) to rise and reset. S10. The fourth electric cylinder (29) is started in sequence to drive the third limit block (31) to rise and exit the wire feeding groove (11). The second electric cylinder (1502) is started to drive the pressure plate (1503) to move backward. The first electric cylinder (202) is started to drive the blocking block (203) to descend, thereby releasing the clamping of the U-shaped spring body (13) and the wire body (44) and taking out the welded U-shaped spring body (13).

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