Full-automatic deep-cavity ball-wedge integrated bonding head device

Abstract

The invention discloses a full-automatic deep-cavity ball-wedge integrated bonding head device, which belongs to the technical field of semiconductor packaging equipment and comprises a bonding head base body, an ultrasonic transducer, a wire clamp assembly, a chopper, a wire guider assembly and an ignition needle assembly. The chopper is detachably mounted on the ultrasonic transducer, and the chopper can be selectively a ball bonding chopper or a wedge bonding chopper; the wire guide device assembly at least comprises a wire guide piece which is detachably installed, and when the chopper is a wedge welding chopper, the wire guide piece is arranged on the side face of the bottom of the chopper and used for providing restraining force for a welding wire at the bottom of the chopper. The ignition needle assembly is detachably installed on a Z-direction stator of the bonding equipment, and when the chopper is a ball bonding chopper, the ignition needle assembly is used for being matched with the chopper to complete welding wire ball burning. According to the invention, the integrated design of the ball bonding head and the wedge bonding head and the rapid switching of the two processes are realized, the multi-process requirements are met, the equipment cost is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of semiconductor packaging equipment, and more particularly to a wire bonding device for semiconductor back-end packaging. More particularly, the present invention relates to a fully automatic deep cavity ball-wedge integrated bonding head device. Background Art

[0002] In the field of semiconductor back-end packaging, wire bonding is an important process step. At present, the common wire bonding processes mainly include ball bonding and wedge bonding. However, the existing bonding equipment can usually only realize a single bonding process, which is difficult to meet the multi-process requirements of ball bonding and wedge bonding at the same time.

[0003] For situations where multiple process proofing is required, the fastest solution in the existing technology is to equip multiple different bonding equipment and perform them alternately. This method first requires the investment of multiple equipment, which increases production costs. After the proofing test is passed, when only one welding process is required for mass production, other equipment is often idle, resulting in a waste of resources and the inability to give full play to the production capacity of multiple equipment running simultaneously.

[0004] Another solution is to replace the ball bonding and wedge bonding heads on the same equipment to achieve different processes. However, for users engaged in mass production, the bonding heads are expensive, and equipping each equipment with two sets of bonding heads for different processes will greatly increase the equipment investment cost; and for some scientific research institutions or users with small-batch production needs for multiple varieties, it is necessary to frequently replace the ball bonding and wedge bonding heads, which is a repetitive waste of time and manpower.

[0005] In summary, the existing technology is difficult to effectively meet the industry's demand for efficient, flexible and economical multi-process bonding equipment. Therefore, there is an urgent need for a bonding head device that can simultaneously meet the multi-process requirements of ball bonding and wedge bonding, and is easy to switch and low in cost, in order to solve the problems existing in the existing technology. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the above problems and provide a fully automatic deep cavity ball-wedge integrated bonding head device, which can not only meet the multi-process requirements of ball welding and wedge welding at the same time, but also has low cost and convenient switching.

[0007] The technical solution of the present invention is: A fully automatic deep cavity ball wedge integrated bonding head device, comprising a bonding head base, an ultrasonic transducer, a wire clamp assembly and a wedge, wherein the ultrasonic transducer and the wire clamp assembly are at least indirectly mounted on the bonding head base, and characterized in that: Also included is a wire guide assembly and a ignition pin assembly; The wedge is detachably mounted on the ultrasonic transducer, and the wedge can be selectively a ball welding wedge or a wedge welding wedge; The wire guide assembly is installed on the bonding head base, and at least includes a detachably installed wire guide piece. When the splitter is a wedge welding splitter, the wire guide piece is arranged on the side of the bottom of the splitter to provide a restraining force for the welding wire at the bottom of the splitter. The spark pin assembly is detachably mounted on the Z-direction stator of the bonding device. When the splitting knife is a ball welding splitting knife, the spark pin assembly is used to cooperate with the splitting knife to complete the welding wire ball burning.

[0008] The integrated design of ball welding and wedge welding bonding heads is achieved through the design of detachable splitting knives, wire guides and spark pin assemblies. The process can be quickly switched by replacing the splitting knives and corresponding accessories to meet multiple process requirements. This design not only reduces equipment costs, but also simplifies material management and significantly improves production efficiency.

[0009] Furthermore, in the above-mentioned fully automatic deep cavity ball-wedge integrated bonding head device, the wire guide assembly includes a wire guide base, a multi-degree-of-freedom adjustment mechanism for adjusting the relative position of the wire guide plate and the wedge welding cutter, and an opening and closing mechanism for driving the wire guide plate to open relative to the wedge welding cutter. The wire guide base is fixedly connected to the bonding head base, one end of the multi-degree-of-freedom adjustment mechanism is connected to the wire guide base, and the other end is connected to the wire guide plate.

[0010] Further, in the above-mentioned fully automatic deep cavity ball-wedge integrated bonding head device, the multi-degree-of-freedom adjustment mechanism 1 includes three linear adjustment mechanisms 1 and at least two angle adjustment mechanisms; Each of the linear adjustment mechanisms 1 includes an adjustment seat, a moving member and a positioning structure, wherein the moving member and the adjustment seat form a relatively movable connection, and the positioning structure is used to fix the relative position of the two. The linear adjustment mechanism 1 may also selectively include a differential adjustment screw for accurately adjusting the relative position of the two, wherein the moving member is slidably connected to the adjustment seat, and the differential adjustment screw connects the moving member and the adjustment seat to form a differential screw transmission, and rotating the differential adjustment screw can cause the moving member to slide relative to the adjustment seat; Each of the angle adjustment mechanisms includes a rotation connection structure and a locking structure for adjusting the inclination angle of the wire guide; The wire guide base is connected to the adjustment seat of the linear adjustment mechanism at the front end, and the wire guide piece is connected to the angle adjustment mechanism at the end.

[0011] Furthermore, in the above-mentioned fully automatic deep cavity ball wedge integrated bonding head device, the linear adjustment mechanism includes an up and down adjustment mechanism, a front and back adjustment mechanism and a left and right adjustment mechanism, and the angle adjustment mechanism includes a pitch angle adjustment mechanism and a left and right torsion angle adjustment mechanism.

[0012] This solution can accurately adjust the position and angle of the wire guide relative to the wedge welding cutter through the design of 5 degrees of freedom adjustment (three linear and two angular) and the differential adjustment screw, eliminate processing and assembly errors, ensure accurate positioning and constraint of the welding wire during wedge welding, and thus improve welding quality and consistency.

[0013] Furthermore, in the above-mentioned fully automatic deep cavity ball wedge integrated bonding head device, the opening and closing mechanism includes an automatic opening and closing mechanism for opening the wire guide piece in a small range, which includes a piezoelectric ceramic, a fixed seat, a displacement hinge and a preload spring. The fixed seat is connected to a moving part of a linear adjustment mechanism. The displacement hinge is a parallelogram. The fixed end of the displacement hinge is fixedly connected to the fixed seat, and the movable end is at least indirectly connected to the wire guide piece. The piezoelectric ceramic piece is installed in the displacement hinge. The telescopic movement of the piezoelectric ceramic piece is converted into the opening and closing movement of the wire guide piece on the adjustment base relative to the wedge welding splitting knife through the displacement hinge. The preload spring piece is arranged between the fixed seat and the movable end of the displacement hinge to apply a preload force to the displacement hinge to keep the wire guide piece closed relative to the wedge welding splitting knife. When the piezoelectric ceramic piece is energized, it drives the wire guide piece to overcome the preload force and open relative to the wedge welding splitting knife.

[0014] The automatic opening and closing mechanism design realizes the precise and rapid opening and closing of the wire guide. The piezoelectric ceramics provide micron-level precise control, while the "triangular amplification structure" of the displacement hinge converts the tiny deformation of the piezoelectric ceramics into a larger opening and closing movement of the wire guide, which not only improves the opening and closing accuracy and speed, but also enhances the reliability and stability of the system, helping to improve welding quality and efficiency.

[0015] As an optimization, in the above-mentioned fully automatic deep cavity ball wedge integrated bonding head device, the opening and closing mechanism also includes a manual opening and closing mechanism for greatly opening the wire guide, which includes a cross flexible bearing and an opening and closing cam. The fixed seat is flexibly connected to a moving part of a linear adjustment mechanism through the cross flexible bearing. The opening and closing cam is configured to drive the fixed seat to rotate relative to the moving part around the cross flexible bearing at a limited angle when it rotates, thereby driving the wire guide away from the wedge welding cutter.

[0016] The design of the manual opening and closing mechanism provides the wire guide with the ability to open and close in a large range, which is used to assist operations such as wire threading. This solution achieves the opening and closing action through a cross flexible bearing with a simple structure and regular shape, and a simple and effective driving method is provided by a cam mechanism. It is not only simple in structure and easy to operate, but also has the characteristics of sensitive rotation, high repeatability and stable operation, which is beneficial to improving the reliability and service life of the equipment.

[0017] Furthermore, in the above-mentioned fully automatic deep cavity ball wedge integrated bonding head device, the ignition needle assembly includes an ignition needle and a multi-degree-of-freedom adjustment mechanism 2 for adjusting the position of the tip of the ignition needle, and the multi-degree-of-freedom adjustment mechanism 2 includes at least three linear adjustment mechanisms 2; each of the linear adjustment mechanisms 2 includes an adjustment seat, a moving part and a positioning structure, the moving part forms a relatively movable connection with the adjustment seat, and the positioning structure is used to fix the relative position of the two; the Z-direction stator is connected to the adjustment seat of the linear adjustment mechanism 2 at the front end, and the ignition needle is connected to the moving part of the linear adjustment mechanism 2 at the end.

[0018] Furthermore, in the above-mentioned fully automatic deep cavity ball wedge integrated bonding head device, the linear adjustment mechanism 2 includes an up and down adjustment mechanism 2, a left and right adjustment mechanism 2 and an oblique front adjustment mechanism, wherein the adjustment direction of the oblique front adjustment mechanism is in the horizontal plane and is at an angle of 45 degrees to the left and right direction.

[0019] The detachable design facilitates the quick removal of the spark pin assembly when switching to the wedge welding process. At the same time, the three-degree-of-freedom adjustment can accurately adjust the position of the spark pin to ensure the optimal distance between the spark pin and the ball welding splitter during ball welding. In particular, the 45-degree adjustment mechanism also increases the flexibility of adjustment. This design not only improves the stability and consistency of ball burning, but also reduces the risk of collision between the spark pin and the splitter, thereby improving the reliability of the equipment and the welding quality.

[0020] Furthermore, in the above-mentioned fully automatic deep cavity ball wedge integrated bonding head device, the wire clamp assembly includes a wire clamp base, a wire clamp static arm, a wire clamp movable arm and a wire clamp driving mechanism, the wire clamp base is at least indirectly connected to the bonding head base, the wire clamp static arm is fixed on the wire clamp base and has a static arm wire clamping surface, the wire clamp movable arm has a movable arm wire clamping surface, and cooperates with the static arm wire clamping surface to form a welding wire clamping structure, and the wire clamp driving mechanism is used to drive the wire clamp movable arm to move relative to the wire clamp static arm, so that the movable arm wire clamping surface and the static arm wire clamping surface move relative to each other to clamp or release the welding wire. The structure of this wire clamp assembly is suitable for both ball welding and wedge welding processes, and can effectively complete the wire pulling action after welding.

[0021] Further, in the above-mentioned fully automatic deep cavity ball wedge integrated bonding head device, the wire clamp movable arm is hinged to the wire clamp static arm through a hinge, and the wire clamp driving mechanism includes two piezoelectric ceramics and two preload springs. The two piezoelectric ceramics act on the wire clamp movable arm, and when powered on, drive the wire clamp movable arm to swing around the rotating fulcrum of the hinge, so that the clamping surface of the movable arm is closed relative to the clamping surface of the static arm to clamp the welding wire, and the two preload springs are arranged between the static arm and the wire clamp movable arm, and are used to provide a preload force to open the wire clamp movable arm relative to the static arm to release the welding wire; The wire clamp movable arm, the rotation fulcrum of the hinge and the second piezoelectric ceramic form a lever-type amplification structure, and the distance from the clamping point of the movable arm clamping surface to the rotation fulcrum is greater than the distance from the second piezoelectric ceramic action point to the rotation fulcrum.

[0022] The tiny deformation of the piezoelectric ceramic is amplified by the lever-type amplification structure, so that the displacement of the movable arm clamping surface is greater than the deformation of the piezoelectric ceramic, so as to increase the displacement output of the piezoelectric ceramic. While satisfying the opening displacement of the wire clamp, precise control is achieved by using piezoelectric ceramics. In addition, the structure is simple, there is no redundant design, and it is easy to assemble and maintain.

[0023] The beneficial effects of the present invention are as follows: through the design of detachable splitting knives, wire guides and spark pin assemblies, an integrated design of ball welding and wedge welding bonding heads is achieved, which not only meets the requirements of multiple processes, but also greatly simplifies the process switching process. For scientific research institutions that need to develop and test and users with small batch and multi-variety production needs, the equipment investment cost is significantly reduced, material management is simplified, and the actual wire welding efficiency is improved. Especially in scenarios where frequent switching of bonding processes is required, the process can be quickly switched by simply replacing the splitting knives and corresponding accessories, which greatly improves production efficiency and saves time and labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the principle of an embodiment of the present invention.

[0025] Figure 2 Schematic diagram of the structure of the wire guide restraining the welding wire in an embodiment of the present invention.

[0026] Figure 3 Schematic diagram of the exploded structure of the wire guide assembly in an embodiment of the present invention.

[0027] Figure 4 Schematic diagram of the action principle of the automatic opening and closing mechanism in an embodiment of the present invention.

[0028] Figure 5 Schematic diagram of the operation principle of the manual opening and closing mechanism in an embodiment of the present invention.

[0029] Figure 6 Schematic diagram of the structure of a cross flexible bearing in an embodiment of the present invention.

[0030] Figure 7 The exploded structure diagram of the ignition needle assembly in the embodiment of the present invention.

[0031] Figure 8 1 is an exploded structural diagram of a wire clamp assembly in an embodiment of the present invention.

[0032] Fig. 9 Schematic diagram of the displacement amplification principle of the wire clamp assembly in an embodiment of the present invention.

[0033] In the figure, 11, Z-direction stator; 12, Z-direction mover; 13, bonding head base; 14, parallelogram mechanism; 15, ultrasonic transducer; 16, splitter; 17, welding wire; B. Wire guide assembly; 20. Wire guide piece; 21. Wire guide base; 22. Up and down moving piece 1; 23. Up and down differential adjustment screw; 24. Fastening screw 1; 25. Front and rear moving piece; 26. Front and rear differential adjustment screw; 27. Fastening screw 2; 31. Adjustment base; 311. Clamping slot; 32. Wire guide piece fixing seat; 321. Pin 1; 33. Fastening screw 3; 34. Pin 2; 35. Fastening screw 4; 36. Fixing hole 1; 361. Adjustment hole 1; 41. Piezoelectric ceramic 1; 42. Fixing seat; 43. Displacement hinge; 44. Preload spring 1; 51. Cross flexible bearing; 52. Opening and closing cam; 53. Opening and closing lever; 54. Fixed ring; 55. Movable ring; 56. Cross flexible support structure; C, ignition needle assembly; 60, ignition needle; 61, two up and down moving parts; 62, five fastening screws; 63, two left and right moving parts; 64, six fastening screws; 65, two fixing holes; 651, two adjusting holes; 66, one positioning pin; 661, one positioning slot; 67, oblique slot; 68, seven fastening screws; A. Wire clamp assembly; 71. Wire clamp base; 72. Wire clamp static arm; 721. Connecting ear; 73. Wire clamp movable arm; 74. Hinge; 741. Rotation fulcrum; 75. Piezoelectric ceramic II; 76. Preload spring II; 77. Fastening screw VIII; 81. Wire clamp positioning hole; 82. Wire clamp fixing hole; 83. Wire clamp positioning pin; 84. Fastening screw Ninth; 85. Fastening screw Ten; 86. Fixing hole III; 861. Adjustment hole III; 87. Positioning pin II; 871. Positioning slot II. DETAILED DESCRIPTION

[0034] The specific implementation of the present invention is now described more completely and clearly in conjunction with the accompanying drawings and embodiments: It should be understood that the specific embodiments given below are for the purpose of explaining to those skilled in the art and are only exemplary and non-restrictive. In the description of the present invention, the directions or positional relationships indicated by the terms such as "upper", "lower", "left", "right", "front", and "rear" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention, and do not indicate or imply that the device or component referred to must have a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0035] Automated bonding equipment has high requirements for bonding speed. During the wire bonding process, the constraint state of the welding wire at the tip of the splitter needs to be considered to prevent the problem of poor consistency of the welding point caused by the non-uniqueness of the welding wire position. There are differences between ball welding and wedge welding processes in this regard: the ball welding process uses high-voltage discharge to burn the ball before welding, and adsorbs the sintered ball at the bottom of the ball welding splitter under the action of vacuum, thereby realizing the constraint of the welding wire at the bottom of the splitter during welding; while the wedge welding process is different. There is no high-voltage discharge burning of the ball. After passing through the center hole of the wedge welding splitter, the welding wire will pass through a 45-degree inclined hole with a smaller inner diameter at the bottom, and finally reach the welding surface. Therefore, the wedge welding wire does not have sufficient constraint force at the transition between the two holes at the bottom of the splitter. A wire guide structure needs to be set to provide constraint force to assist the normal wedge welding bonding.

[0036] Based on the above situation, if Figure 1 As shown, the fully automatic deep cavity ball wedge integrated bonding head device provided in this embodiment includes a bonding head base 13, a parallelogram mechanism 14, an ultrasonic transducer 15, a wire clamp assembly A and a splitter 16. The bonding head base 13 is connected to the Z-direction mover 12 of the bonding device, and the Z-direction mover 12 is slidably connected to the Z-direction stator 11 of the bonding device. The parallelogram mechanism 14 is connected to the bonding head base 13 and its front end is connected to the splitter 16 through the ultrasonic transducer 15. In order to meet the multi-process requirements of ball welding and wedge welding at the same time, the fully automatic deep cavity ball wedge integrated bonding head device of the present invention also includes a wire guide assembly B for wedge welding and a spark needle assembly C for ball welding. The splitter 16 is detachably mounted on the ultrasonic transducer 15, and the splitter 16 can be selectively a ball welding splitter or a wedge welding splitter. The wire guide assembly B is mounted on the bonding head base 13 and includes at least a detachably mounted wire guide piece 20. When the wedge 16 is a wedge welding wedge, the wire guide piece 20 is arranged on the side of the bottom of the wedge 16 to provide a restraining force (such as Figure 2 As shown); the spark needle assembly C is detachably mounted on the Z-direction stator 11 of the bonding device. When the splitter 16 is a ball welding splitter, the spark needle assembly C is used to cooperate with the ball welding splitter to complete the wire ball burning.

[0037] like Figure 3As shown, in this embodiment, the wire guide assembly B includes a wire guide base 21, a five-degree-of-freedom adjustment mechanism for adjusting the relative position of the wire guide piece 20 and the wedge welding wedge, and an opening and closing mechanism for driving the wire guide piece 20 to open relative to the wedge welding wedge. The wire guide base 21 is fixedly connected to the bonding head base 13, and one end of the five-degree-of-freedom adjustment mechanism is connected to the wire guide base 21, and the other end is connected to the wire guide piece 20. The five-degree-of-freedom adjustment mechanism is to eliminate processing and assembly errors and ensure the relative position of the wire guide piece 20 and the bottom of the wedge welding wedge, and includes three linear adjustment mechanisms, namely, an up-down adjustment mechanism, a front-back adjustment mechanism, and a left-right adjustment mechanism, and two angle adjustment mechanisms, namely, a pitch angle adjustment mechanism and a left-right torsion angle adjustment mechanism.

[0038] Each linear adjustment mechanism includes an adjustment seat, a moving part and a positioning structure. The moving part and the adjustment seat form a relatively movable connection, and the positioning structure is used to fix the relative position of the two; the linear adjustment mechanism can also selectively include a differential adjustment screw for accurately adjusting the relative position of the two, the moving part is slidably connected to the adjustment seat, the differential adjustment screw connects the moving part and the adjustment seat to form a differential screw transmission, and rotating the differential adjustment screw can cause the moving part to slide relative to the adjustment seat; each angle adjustment mechanism includes a rotating connection structure and a locking structure, which are used to adjust the inclination angle of the wire guide plate 20; the wire guide base 21 is connected to the adjustment seat of the linear adjustment mechanism 1 at the front end, and the wire guide plate is connected to the angle adjustment mechanism at the end.

[0039] Specifically, the up-down adjustment mechanism 1 includes an up-down moving member 22, an up-down positioning structure 1 and an up-down differential adjustment screw 23, and the wire guide base 21 constitutes an adjustment seat of the up-down adjustment mechanism 1; the up-down moving member 22 and the wire guide base 21 are respectively provided with a slider and a slide groove, and the two are connected by the slider and the slide groove to achieve up-down sliding connection; the up-down differential adjustment screw 23 has two sections of threads with different pitches, which connect the up-down moving member 22 and the wire guide base 21 in the up-down direction to form a differential screw transmission; the up-down positioning structure 1 The positioning structure includes a fastening screw 24, and one side wall of the slide groove is arranged to be an elastic deformation wall that can be brought close to the other opposite side wall. The fastening screw 24 penetrates the elastic deformation wall from the side and is threadedly connected to the wire guide base 21. By tightening the fastening screw 24, the two side walls of the slide groove can be tightened to clamp the up and down moving parts 22; loosening the fastening screw 24 and rotating the up and down differential adjustment screws 23 can cause the up and down moving parts 22 to slide up and down relative to the wire guide base 21, thereby realizing fine adjustment of the up and down positions of the wire guide plate 20.

[0040] The front-to-back adjustment mechanism includes a front-to-back moving member 25, a front-to-back positioning structure and a front-to-back differential adjustment screw 26, and the upper and lower moving members 22 constitute an adjustment seat of the front-to-back adjustment mechanism; the front-to-back moving member 25 is also connected to the upper and lower moving member 22 by sliding forward and backward through a slider and a slide groove structure, and the front-to-back differential adjustment screw 26 connects the front-to-back moving member 25 and the upper and lower moving member 22 along the front-to-back direction to form a differential screw transmission; the front-to-back positioning structure is the same as the upper and lower positioning structure, including a fastening screw 27, which tightens the slide groove of the upper and lower moving member 22 from the side to clamp the front-to-back moving member 25; loosening the fastening screw 27 and rotating the front-to-back differential adjustment screw 26 can cause the front-to-back moving member 25 to slide forward and backward relative to the upper and lower moving member 22, thereby realizing fine adjustment of the front-to-back position of the wire guide 20.

[0041] The left and right adjustment mechanism 1 and the pitch angle adjustment mechanism are designed as one body, including an adjustment base 31, a wire guide plate fixing seat 32, a pin shaft 1 321 and a fastening screw 33. The adjustment base 31 is at least indirectly connected to the front and rear moving member 25. The pin shaft 1 321 is fixedly connected to one end of the wire guide plate fixing seat 32 along the left and right direction. The wire guide plate 20 is fixed on the wire guide plate fixing seat 32. The adjustment base 31 is provided with a clamping slot 311 facing left and right. The pin shaft 1 321 is penetrated through the clamping slot 3 11, the fastening screw three 33 tightens the clamping slot 311 from the side to clamp the pin shaft 1 321; the adjustment base 31, the pin shaft 1 321 and the fastening screw three 33 respectively constitute the adjustment seat, the moving part and the positioning structure of the left and right adjustment mechanism 1, and also constitute the rotating connection structure and the locking structure of the pitch angle adjustment mechanism; after loosening the fastening screw three 33, the wire guide plate fixing seat 32 can be moved left and right or rotated around the pin shaft 1 321, so as to adjust the left and right position and the pitch angle of the wire guide plate 20.

[0042] The left-right torsion angle adjustment mechanism includes a pin shaft 2 34 and two fastening screws 4 35. The axis of the pin shaft 2 34 is arranged along the front-back direction. The wire guide piece 20 is rotatably connected to the wire guide piece fixing seat 32 through the pin shaft 2 34 and is locked and fixed by the fastening screws 4 35, thereby forming a rotating connection structure and a locking structure of the left-right torsion angle adjustment mechanism; the connection structure between the wire guide piece 20 and the wire guide piece fixing seat 32 is arranged to allow the wire guide piece 20 to have a position adjustment margin for rotating relative to the wire guide piece fixing seat 32 around the pin shaft 2 34. The specific structure in this embodiment is: Two groups of corresponding fixing holes 36 and adjusting holes 361 are respectively provided on the guide plate fixing seat 32 and the wire guide plate 20. The fastening screws 35 pass through the adjusting holes 361 and the fixing holes 36, and are fastened by means of a nut matched with the thread of the fixing hole 36 or a matching nut to fix the wire guide plate 20 on the wire guide plate fixing seat 32. The aperture of the adjusting hole 361 is larger than the aperture of the fixing hole 36 to form a rotation adjustment margin. After loosening the fastening screws 35, the wire guide plate 20 can be twisted around the pin shaft 34 to adjust the left and right torsional swing angle of the wire guide plate 20.

[0043] The operation method of the five-degree-of-freedom adjustment mechanism of the wire guide assembly B is: 1. Fine adjustment up and down: Loosen the corresponding fastening screw 24, and gently turn the up and down differential adjustment screw 23 to fine-tune the up and down position of the wire guide 20 relative to the wedge welding cutter, and adjust it to the point where the tip of the wire guide 20 can at least cover 1 / 2 of the 45-degree inclined hole at the bottom of the wedge welding cutter in the up and down direction, so that the wire guide 20 can better restrain the welding wire 17 at the bottom of the wedge welding cutter; 2. Front and rear fine adjustment: Loosen the corresponding fastening screw 27, and gently turn the front and rear differential adjustment screw 26 to fine-tune the front and rear position of the wire guide 20 relative to the wedge welding cutter. When the opening and closing voltages are both 0, adjust the front and rear position of the wire guide 20 to just touch the wedge welding cutter, so that the opening voltage or closing voltage is not set too high due to the gap between the two being too large or too small; 3. Left-right adjustment and pitch angle adjustment: Loosen the fastening screw 33 on the adjustment base 31, use tweezers to move the wire guide 20, adjust it to the center of the wedge welding cutter in the left-right position, and adjust the relative angle between the wire guide 20 and the wedge welding cutter to as small as possible in the pitch angle, so as to increase the constraint surface of the wire guide 20 on the welding wire 17; 4. Adjust the left and right torsion angle: Loosen the two fastening screws 35 on the wire guide plate fixing seat 32, and twist the wire guide plate 20 appropriately around the pin 34 to adjust its torsion angle, so as to eliminate the position deviation caused by processing and assembly errors; After adjusting in each direction above, you need to re-tighten the corresponding fastening screws.

[0044] like Figure 3 As shown, in this embodiment, the opening and closing mechanism of the wire guide assembly B includes an automatic opening and closing mechanism for slightly opening the wire guide piece 20 and a manual opening and closing mechanism for significantly opening the wire guide piece 20. The manual opening and closing mechanism is used to assist operations such as threading the welding wire.

[0045] like Figure 3 and Figure 4As shown, the automatic opening and closing mechanism is arranged between the adjustment base 31 and the front and rear moving member 25, including a piezoelectric ceramic 41, a fixed seat 42, a displacement hinge 43 and a preload spring 44; the fixed seat 42 is connected to the front and rear moving member 25, the displacement hinge 43 is a parallelogram, the fixed end of the displacement hinge 43 is fixedly connected to the fixed seat 42, and the movable end is fixedly connected to the adjustment base 31, the piezoelectric ceramic 41 is installed in the displacement hinge 43, and the installation angle of the piezoelectric ceramic 41 is set at an angle with the fixed side of the parallelogram, thereby forming "Triangular amplification structure", the telescopic movement of the piezoelectric ceramic 41 is converted into the opening and closing movement of the wire guide 20 on the adjustment base 31 relative to the wedge welding splitter through the displacement hinge 43, and the deformation of the piezoelectric ceramic 41 is smaller than the displacement of the wire guide 20; the preload spring 44 is arranged between the fixed seat 42 and the movable end of the displacement hinge 43, and applies a preload force to the displacement hinge 43 to keep the wire guide 20 closed relative to the wedge welding splitter. When the piezoelectric ceramic 41 is energized, it stretches to drive the wire guide 20 to overcome the preload force and open relative to the wedge welding splitter.

[0046] like Figure 3 , Figure 4 and Figure 5 As shown, the manual opening and closing mechanism includes a cross flexible bearing 51 and an opening and closing cam 52. The fixed seat 42 is flexibly connected to the front and rear moving parts 25 through the cross flexible bearing 51. The opening and closing cam 52 is configured to apply a force to at least one of the fixed seat 42 or the front and rear moving parts 25 when it rotates. The force has a component force that is eccentric and perpendicular to the rotation center line of the cross flexible bearing 51 to generate a torque around the rotation center line, thereby driving the fixed seat 42 to rotate around the cross flexible bearing 51 at a limited angle relative to the front and rear moving parts 25, thereby driving the wire guide 20 away from the wedge welding splitter. The specific structure in this embodiment is: the opening and closing cam 52 is rotatably connected to the fixed seat 42, and an opening and closing lever 521 is provided on the opening and closing cam 52. The opening action is to drive the opening and closing cam 52 to rotate by shifting the opening and closing lever 521. The cam surface of the opening and closing cam 52 abuts against the front and rear moving parts 25, thereby reacting to the fixed seat 42 to push the fixed seat 42 to rotate around the cross flexible bearing 51; and the closing action is achieved by relying on the rotational torque of the cross flexible bearing 51 itself. Figure 6As shown, the cross flexible bearing 51 includes a fixed ring 54, a movable ring 55 and a cross flexible supporting structure 56, the fixed ring 54 and the movable ring 55 are coaxially arranged, the fixed ring 54 is fixedly connected to the front and rear moving parts 25, and the movable ring 55 is fixedly connected to the fixed seat 42; the cross flexible supporting structure 56 is arranged in the fixed ring 54 and the movable ring 55, and includes a first elastic blade and a second elastic blade arranged vertically in a cross shape, one end of the first elastic blade and the second elastic blade is fixed in the fixed ring 54, and the other end is fixed in the movable ring 55, thereby allowing the movable ring 55 to overcome the elastic force of the first and second elastic blades and perform a limited angular displacement relative to the fixed ring 54, so that the fixed seat 43 can rotate at a limited angle relative to the front and rear moving parts 25.

[0047] like Figure 1 and Figure 7 As shown, the ignition needle assembly C includes an ignition needle 60 and a three-degree-of-freedom adjustment mechanism for adjusting the tip position of the ignition needle 60. The three-degree-of-freedom adjustment mechanism includes three linear adjustment mechanisms 2, namely an up and down adjustment mechanism 2, a left and right adjustment mechanism 2 and an oblique front adjustment mechanism. The adjustment direction of the oblique front adjustment mechanism is in the horizontal plane and forms an angle of 45 degrees with the left and right directions.

[0048] Each linear adjustment mechanism 2 includes an adjustment seat, a moving part and a positioning structure. The moving part and the adjustment seat form a relatively movable connection, and the positioning structure is used to fix the relative positions of the two; the Z-direction stator 11 is connected to the adjustment seat of the linear adjustment mechanism 2 at the front end, and the ignition needle 60 is connected to the moving part of the linear adjustment mechanism 2 at the end.

[0049] Specifically, the up-down adjustment mechanism 2 includes an up-down moving part 2 61 and an up-down positioning structure 2, and the Z-direction stator 11 constitutes an adjustment seat of the up-down adjustment mechanism 2; the up-down moving part 2 61 is connected to the Z-direction stator 11 by sliding up and down through a slider and a slide groove structure, and one side wall of the slide groove is set as an elastic deformation wall that can be close to the other opposite side wall; the up-down positioning structure 2 includes a fastening screw 5 62, and the fastening screw 5 62 tightens the slide groove of the Z-direction stator 11 from the side to clamp the up-down moving part 2 61; after loosening the fastening screw 5 62, the up-down moving part 2 61 can move up and down along the slide groove, thereby adjusting the up-and-down position of the tip of the ignition needle 60.

[0050] The left-right adjustment mechanism 2 includes a left-right moving member 2 63 and a left-right positioning structure 2, and the up-down moving member 2 61 constitutes an adjustment seat of the left-right adjustment mechanism 2; the left-right positioning structure 2 includes two fastening screws 64, and the left-right moving member 2 63 is fixedly connected to the up-down moving member 2 61 by the fastening screws 64, and its connection structure is set to only allow the left-right moving member 2 64 to have a position adjustment margin in the left-right direction. The specific structure in this embodiment is: the left-right moving member 2 63 and the up-down moving member 2 61 are respectively provided with two groups of corresponding fixing holes 2 65 and adjusting holes 2 651, and the fastening screws 64 pass through the adjusting holes 2 651 and the fixing holes 651. The fixing hole 65 is fastened by a nut that cooperates with the thread of the fixing hole 65 or is matched with the fixing hole 65. The adjusting hole 651 has an adjustment margin and is limited to only allow the left-right moving part 63 to be adjusted in the left-right direction. The structure that limits this direction includes two positioning pins 66 that are passed through the up-and-down moving part 61, and two positioning grooves 661 that extend along the left-and-right direction and are correspondingly arranged on the left-and-right moving part 63. After loosening the fastening screw 64, the left-and-right moving part 63 can be moved along the left-and-right direction under the cooperation and guidance of the positioning pin 66 and the positioning groove 661, so as to adjust the left-and-right position of the tip of the ignition needle 60.

[0051] The oblique front adjustment mechanism includes a 45-degree oblique groove 67 and a fastening screw 68 provided on the left-right movable member 2 63. The 45-degree oblique groove 67 is horizontally arranged and forms an angle of 45 degrees with the left-right direction. The ignition needle 60 is inserted into the 45-degree oblique groove 67. One side wall of the 45-degree oblique groove 67 is arranged as an elastic deformation wall that can be moved toward the other opposite side wall. The fastening screw 68 tightens the 45-degree oblique groove 67 from the side to clamp the ignition needle 60; the left-right movable member 2 63, the ignition needle 60 and the fastening screw 68 respectively constitute the adjustment seat, the movable member and the positioning structure of the oblique front adjustment mechanism; after loosening the fastening screw 68, the ignition needle 60 can be moved along the 45-degree oblique groove 67, so as to adjust the position of the tip of the ignition needle 60 in the oblique front direction of 45 degrees.

[0052] The ignition needle 60 is used in the ball welding process to provide high-voltage discharge for the ball burning process. Before each welding, the ball welding cutter is raised to the set position in the Z direction, and the high-voltage current is discharged through the tip of the ignition needle 60, forming a current between the welding wire 17 on the tip of the ball welding cutter, and the end of the welding wire 17 is melted to complete the ball burning work, and the ball welding cutter is reset to the welding height for welding. The preferred installation position of the ignition needle 60 is that the ignition needle tip is 1-2 times the wire diameter away from the ball welding cutter tip in the horizontal direction, because if the distance is too large, it may cause unstable phenomena such as ignition open circuit, and if the distance is too small, it increases the risk of collision between the ball welding cutter tip and the ignition needle 60. The position of the ignition needle 60 is adjusted after the ball welding cutter is installed.

[0053] The wire clamp assembly A is mainly used to complete the wire pulling action after welding. For ball welding and wedge welding, the wire pulling action is completed by the wire clamp assembly A. Figure 8 As shown, the wire clamp assembly A includes a wire clamp base 71, a wire clamp stationary arm 72, a wire clamp movable arm 73 and a wire clamp driving mechanism. The wire clamp base 71 is at least indirectly connected to the bonding head base 13, the wire clamp stationary arm 72 is fixed on the wire clamp base 71 and has a stationary arm wire clamping surface, the wire clamp movable arm 73 has a movable arm wire clamping surface, and cooperates with the stationary arm wire clamping surface to form a welding wire 17 clamping structure, the movable arm and the stationary arm wire clamping surfaces are both perpendicular to the horizontal plane, and the wire clamp driving mechanism is used to drive the wire clamp movable arm 73 to move relative to the wire clamp stationary arm 72, so that the movable arm wire clamping surface and the stationary arm wire clamping surface move relative to each other to clamp or release the welding wire 17.

[0054] Among them, the wire clamp movable arm 73 is hinged to the wire clamp static arm 72 through a hinge 74, and the wire clamp driving mechanism includes piezoelectric ceramic 2 75 and preload spring 2 76. The piezoelectric ceramic 2 75 acts on the wire clamp movable arm 73. When powered on, it drives the wire clamp movable arm 73 to swing around the rotation fulcrum 741 of the hinge 74, so that the movable arm clamping surface is closed relative to the static arm clamping surface to clamp the welding wire 17. The preload spring 2 76 is arranged between the static arm 72 and the wire clamp movable arm 73, and is used to provide a preload force to open the wire clamp movable arm 73 relative to the static arm 72 to release the welding wire 17. The specific structure of the present embodiment is as follows: the wire clamp static arm 72 and the wire clamp movable arm 73 are both composed of a clamp head and a handle, the clamping surface is located at the clamp head, the clamp head and handle of the wire clamp static arm 72 and the handle of the wire clamp movable arm 73 are integrally formed, and a connection portion whose thickness and length are smaller than the handle is formed between the two handles, so that the connection portion is flexible and can be deformed to become the hinge 74, and the clamp head of the wire clamp movable arm 73 is fixedly connected to its handle by a fastening screw 8 77, thereby realizing the wire clamp static arm 7 2 is hinged with the wire clamp movable arm 73. During assembly, when no power is supplied, first set the gap between the two clamping surfaces by a precision feeler gauge, and then tighten the fixing screw 8 77 to lock and fix the wire clamp movable arm 73; the two ends of the piezoelectric ceramic 2 75 are respectively connected to the handles of the wire clamp static arm 72 and the wire clamp movable arm 73, and the two ends of the preload spring 2 76 are also respectively connected to the two handles, and the distance from the action point of the preload spring to the rotation fulcrum 741 of the hinge 74 is greater than the distance from the action point of the piezoelectric ceramic 2 75 to the rotation fulcrum 741.

[0055] like Fig. 9As shown, the above-mentioned wire clamp movable arm 73, the rotation fulcrum 741 of the hinge 74 and the piezoelectric ceramic 2 75 constitute a lever-type amplification structure, and the distance X1 from the clamping point of the movable arm clamping surface to the rotation fulcrum 741 is greater than the distance X2 from the action point of the piezoelectric ceramic 2 75 to the rotation fulcrum 741, so that the displacement of the movable arm clamping surface is greater than the deformation of the piezoelectric ceramic 2 75, so as to increase the displacement output of the piezoelectric ceramic 2 75 and meet the opening displacement of the wire clamp. The amplification ratio of the displacement of the movable arm clamping surface relative to the deformation of the piezoelectric ceramic 2 75 is X1 / X2. By increasing the distance X1 from the clamping surface to the rotation fulcrum 741, or shortening the distance X2 from the action point of the piezoelectric ceramic 2 75 to the rotation fulcrum 741, the displacement output of the piezoelectric ceramic 2 75 can be appropriately increased to meet the displacement opening index required for the actual release of the welding wire 17.

[0056] like Figure 8 As shown, in the present embodiment, the wire clamp base 71 is fixedly connected to the front-rear moving member 25 of the wire guide assembly B, thereby being indirectly connected to the bonding head base 13. Specifically, the front-rear moving member 25 and the wire clamp base 71 are both provided with two wire clamp positioning holes 81 arranged in the vertical direction and a wire clamp fixing hole 82 located between the two wire clamp positioning holes 81. Two wire clamp positioning pins 83 pass through the wire clamp positioning holes 81 to determine the position of the wire clamp base 71, and then the wire clamp base 71 is fixed to the front-rear moving member 25 by fastening screws 84 passing through the wire clamp fixing holes 82. The verticality of the static arm clamping surface is ensured by the above-mentioned two wire clamp positioning pins 83.

[0057] In addition, the static arm 72 of the wire clamp can be adjusted appropriately in a direction perpendicular to the static arm clamping surface so that the static arm clamping surface is aligned with the position of the center hole of the riving knife 16. The specific structure is: a connecting ear 721 is provided on the static arm 72 of the wire clamp, and the connecting ear 721 is fixedly connected to the wire clamp base 71 by two fastening screws 10 85. The connection structure is configured to only allow the static arm 72 of the wire clamp to have a position adjustment margin in a direction perpendicular to the static arm clamping surface. Specifically, two groups of corresponding fixing holes 3 86 and adjusting holes 3 861 are respectively provided on the connecting ear 721 and the wire clamp base 71. The fastening screws 10 85 pass through the adjusting holes 3 861 and the fixing holes 3 86, and are connected to the fixing holes 3 86 by the fixing holes 3 86. 6 is fastened by threaded cooperation or matching nut, the adjustment hole three 861 has an adjustment margin and is limited to only allow the position of the wire clamp static arm 72 to be adjusted in a direction perpendicular to the static arm clamping surface, and the structure limiting this direction includes two positioning pins two 87 passed through the connecting ear 721, and two corresponding positioning grooves two 871 extending in a direction perpendicular to the static arm clamping surface on the wire clamp base 71; after loosening the fastening screw ten 85, the wire clamp static arm 72 can be moved in a direction perpendicular to the static arm clamping surface under the guidance of the cooperation of the positioning pin two 87 and the positioning groove two 871, thereby adjusting the position of the static arm clamping surface to align it with the center line of the center hole of the chopper 16.

[0058] In this embodiment, the slide grooves all adopt a dovetail groove structure to ensure that the slider can only slide along a specified direction without loosening.

[0059] The method of use of the present invention is as follows: When switching from the ball welding process to the wedge welding process, first loosen the fastening screw 5 62, remove the ignition needle assembly C fixed on the Z-direction stator 11, then replace the upper wedge welding cutter, and reset the wire guide plate fixing seat 32 together with the wire guide plate 20 to the adjustment base 31 of the wire guide assembly B, and finally adjust the position of the wire guide plate 20 relative to the wedge welding cutter; When changing from wedge welding process to ball welding, it is necessary to remove the wire guide 20 to avoid interference with the ignition needle 60. For ease of operation, loosen the fastening screw 33, remove the wire guide fixing seat 32 of the wire guide assembly B together with the wire guide 20, then replace the ball welding chopper, and reset the ignition needle assembly C to the Z-direction stator, and finally adjust the position of the ignition needle 60 according to the position of the ball welding chopper.

[0060] It is understandable that a person skilled in the art can make other corresponding changes and modifications based on the technical concept of the present invention, and all these changes and modifications should fall within the protection scope of the claims of the present invention.

Claims

1. A fully automatic deep cavity ball wedge integrated bonding head device, comprising a bonding head base, an ultrasonic transducer, a wire clamp assembly and a wedge, wherein the ultrasonic transducer and the wire clamp assembly are at least indirectly mounted on the bonding head base, characterized in that: Also included is a wire guide assembly and a ignition pin assembly; The wedge is detachably mounted on the ultrasonic transducer, and the wedge can be selectively a ball welding wedge or a wedge welding wedge; The wire guide assembly is installed on the bonding head base, and at least includes a detachably installed wire guide piece. When the splitter is a wedge welding splitter, the wire guide piece is arranged on the side of the bottom of the splitter to provide a restraining force for the welding wire at the bottom of the splitter. The spark pin assembly is detachably mounted on the Z-direction stator of the bonding device. When the splitting knife is a ball welding splitting knife, the spark pin assembly is used to cooperate with the splitting knife to complete the welding wire ball burning.

2. The fully automatic deep cavity ball-wedge integrated bonding head device according to claim 1, characterized in that: The wire guide assembly includes a wire guide base, a multi-degree-of-freedom adjustment mechanism for adjusting the relative position of the wire guide plate and the wedge welding cutter, and an opening and closing mechanism for driving the wire guide plate to open relative to the wedge welding cutter. The wire guide base is fixedly connected to the bonding head base, one end of the multi-degree-of-freedom adjustment mechanism is connected to the wire guide base, and the other end is connected to the wire guide plate.

3. The fully automatic deep cavity ball-wedge integrated bonding head device according to claim 2, characterized in that: The multi-degree-of-freedom adjustment mechanism 1 includes three linear adjustment mechanisms 1 and at least two angle adjustment mechanisms; Each of the linear adjustment mechanisms 1 includes an adjustment seat, a moving member and a positioning structure, wherein the moving member and the adjustment seat form a relatively movable connection, and the positioning structure is used to fix the relative position of the two. The linear adjustment mechanism 1 may also selectively include a differential adjustment screw for accurately adjusting the relative position of the two, wherein the moving member is slidably connected to the adjustment seat, and the differential adjustment screw connects the moving member and the adjustment seat to form a differential screw transmission, and rotating the differential adjustment screw can cause the moving member to slide relative to the adjustment seat; Each of the angle adjustment mechanisms includes a rotation connection structure and a locking structure for adjusting the inclination angle of the wire guide; The wire guide base is connected to the adjustment seat of the linear adjustment mechanism at the front end, and the wire guide piece is connected to the angle adjustment mechanism at the end.

4. The fully automatic deep cavity ball-wedge integrated bonding head device according to claim 3, characterized in that: The linear adjustment mechanism 1 includes an up-down adjustment mechanism 1, a front-back adjustment mechanism and a left-right adjustment mechanism 1, and the angle adjustment mechanism includes a pitch angle adjustment mechanism and a left-right torsion angle adjustment mechanism.

5. The fully automatic deep cavity ball-wedge integrated bonding head device according to claim 3 or 4, characterized in that: The opening and closing mechanism includes an automatic opening and closing mechanism for opening the wire guide piece in a small range, which includes a piezoelectric ceramic, a fixed seat, a displacement hinge and a preload spring. The fixed seat is connected to a moving part of a linear adjustment mechanism. The displacement hinge is a parallelogram. The fixed end of the displacement hinge is fixedly connected to the fixed seat, and the movable end is at least indirectly connected to the wire guide piece. The piezoelectric ceramic is installed in the displacement hinge. The telescopic movement of the piezoelectric ceramic is converted into the opening and closing movement of the wire guide piece on the adjustment base relative to the wedge welding splitting knife through the displacement hinge. The preload spring is arranged between the fixed seat and the movable end of the displacement hinge to apply a preload force to the displacement hinge to keep the wire guide piece closed relative to the wedge welding splitting knife. When the piezoelectric ceramic is energized, it drives the wire guide piece to overcome the preload force and open relative to the wedge welding splitting knife.

6. The fully automatic deep cavity ball-wedge integrated bonding head device according to claim 5, characterized in that: The opening and closing mechanism also includes a manual opening and closing mechanism for opening the wire guide piece in a large range, which includes a cross flexible bearing and an opening and closing cam. The fixed seat is flexibly connected to a moving part of a linear adjustment mechanism through the cross flexible bearing. The opening and closing cam is configured to drive the fixed seat to rotate relative to the moving part around the cross flexible bearing at a limited angle when it rotates, thereby driving the wire guide piece away from the wedge welding cutter.

7. The fully automatic deep cavity ball-wedge integrated bonding head device according to claim 1, characterized in that: The ignition needle assembly includes an ignition needle and a multi-degree-of-freedom adjustment mechanism 2 for adjusting the position of the tip of the ignition needle, the multi-degree-of-freedom adjustment mechanism 2 includes at least three linear adjustment mechanisms 2; each of the linear adjustment mechanisms 2 includes an adjustment seat, a moving part and a positioning structure, the moving part forms a relatively movable connection with the adjustment seat, and the positioning structure is used to fix the relative position of the two; the Z-direction stator is connected to the adjustment seat of the linear adjustment mechanism 2 at the front end, and the ignition needle is connected to the moving part of the linear adjustment mechanism 2 at the end.

8. The fully automatic deep cavity ball-wedge integrated bonding head device according to claim 6, characterized in that: The second linear adjustment mechanism includes a second up-down adjustment mechanism, a second left-right adjustment mechanism and an oblique front adjustment mechanism, wherein the adjustment direction of the oblique front adjustment mechanism is in the horizontal plane and forms an angle of 45 degrees with the left-right direction.

9. The fully automatic deep cavity ball-wedge integrated bonding head device according to claim 1, characterized in that: The wire clamp assembly includes a wire clamp base, a wire clamp static arm, a wire clamp movable arm and a wire clamp driving mechanism. The wire clamp base is at least indirectly connected to the bonding head base. The wire clamp static arm is fixed to the wire clamp base and has a static arm wire clamping surface. The wire clamp movable arm has a movable arm wire clamping surface and cooperates with the static arm wire clamping surface to form a welding wire clamping structure. The wire clamp driving mechanism is used to drive the wire clamp movable arm to move relative to the wire clamp static arm, so that the movable arm wire clamping surface and the static arm wire clamping surface move relative to each other to clamp or release the welding wire.

10. The fully automatic deep cavity ball-wedge integrated bonding head device according to claim 9, characterized in that: The wire clamp movable arm is hinged with the wire clamp static arm through a hinge, and the wire clamp driving mechanism includes two piezoelectric ceramics and two preload springs. The two piezoelectric ceramics act on the wire clamp movable arm and drive the wire clamp movable arm to swing around the rotating fulcrum of the hinge when powered on, so that the wire clamping surface of the movable arm is closed relative to the wire clamping surface of the static arm to clamp the welding wire. The two preload springs are arranged between the static arm and the wire clamp movable arm, and are used to provide a preload force to open the wire clamp movable arm relative to the static arm to release the welding wire. The wire clamp movable arm, the rotation fulcrum of the hinge and the second piezoelectric ceramic form a lever-type amplification structure, and the distance from the clamping point of the movable arm clamping surface to the rotation fulcrum is greater than the distance from the second piezoelectric ceramic action point to the rotation fulcrum.

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