A lead bonding apparatus for semiconductor packaging

Abstract

The application discloses a lead welding device for semiconductor packaging and relates to the technical field of semiconductor production, which comprises a connecting seat, one end of which is fixedly connected to an external driving device, the middle part of the other end of the connecting seat is provided with a matching hole, a first transmission shaft is matched with the matching hole through a bearing, and the middle part of the first transmission shaft is provided with a first lead hole; a lead pulling assembly is distributed at the wall surface of the connecting seat close to the top side of the first transmission shaft and the bottom of the first transmission shaft; a driving assembly is arranged at one side of the bottom end of the connecting seat, the output end of the driving assembly is fixedly connected with an adjusting structure, the adjusting structure is fixedly connected with a welding head, the middle part of the welding head is provided with a second lead hole; a position-stopping assembly is arranged at the other side of the bottom end of the connecting seat, the position-stopping assembly can realize automatic transmission of the lead, can control the length of the lead pulled out from the bottom end of the welding head, and can ensure that the length of the lead pulled out from the welding head is unchanged when the welding head welds the lead.

Description

Technical Field

[0001] This invention relates to the field of semiconductor manufacturing technology, specifically to a wire bonding apparatus for semiconductor packaging. Background Technology

[0002] In semiconductor packaging processes, wire bonding is a critical step in connecting chips, lead frames, and internal pins of the package. The quality of this bonding directly affects the electrical performance and reliability of the device. Traditional wire bonding equipment typically includes a wire supply mechanism, a bonding head, and a drive assembly. The bonding head bonds the wires point by point to preset bonding positions.

[0003] However, in practical applications, existing wire bonding devices suffer from insufficient precision in controlling the reciprocating motion of the bonding head in the height direction. Especially during continuous bonding, the consistency of the bonding head's downward pressure depth and retraction speed is poor, resulting in significant fluctuations in the connection quality between the lead and the pin, lead frame, and chip. This can easily lead to problems such as cold solder joints, desoldering, or oversoldering. Furthermore, the length of the lead extending beyond the bottom of the bonding head is difficult to control precisely. Due to the lack of effective limiting or stopping structures, the lead may slide or extend during the bonding process due to the movement of the bonding head, resulting in inconsistent lead lengths extending beyond the bonding head each time. This not only affects the quality of the solder joint formation but also increases the difficulty of disconnecting the lead after bonding, easily leading to incomplete wire breakage, excessively long residual wires at the solder joint, or damage to the solder joint. Summary of the Invention

[0004] To address the technical deficiencies in the background art, this invention proposes a wire bonding device for semiconductor packaging, which solves the aforementioned technical problems and meets practical needs. The specific technical solution is as follows: A wire bonding apparatus for semiconductor packaging, comprising: A connecting seat, one end of which is fixedly connected to an external driving device, and the other end of the connecting seat has a mating hole in the middle, and a first transmission shaft is mated in the mating hole through a bearing, and the first transmission shaft has a first lead hole in the middle. A pull wire assembly is distributed on both the wall surface near the top of the first drive shaft and the bottom of the first drive shaft of the connecting seat. The portion of the pull wire assembly distributed on the wall surface near the top of the first drive shaft drives the first drive shaft to rotate. When the first drive shaft rotates, the movable end of the portion of the pull wire assembly distributed at the bottom of the first drive shaft reciprocates in the height direction and pulls the lead wire out of the first lead wire hole. A drive assembly is disposed on one side of the bottom end of the connector. An adjustment structure is fixedly connected to the output end of the drive assembly. A welding head is fixedly connected to the adjustment structure. The drive assembly drives the welding head to reciprocate in the height direction. A second lead wire hole is provided in the middle of the welding head. A lead wire pulled out from the first lead wire hole enters from the top of the second lead wire hole and exits from the bottom of the second lead wire hole. A stop assembly is disposed on the other side of the bottom end of the connector. The stop assembly is connected to the adjustment structure and, driven by the drive assembly, its movable end clamps and fixes the lead wire located between the first lead wire hole and the second lead wire hole.

[0005] As a further improvement of the present invention, the wire pulling assembly includes a first motor, a first connecting block, a second connecting block, and a clamping structure. The first motor is fixedly connected to the wall surface of the connecting seat near the top of the first drive shaft. The output end of the first motor extends through the top of the connecting seat and is fixedly connected to a first bevel gear. The top of the first drive shaft is fitted with a second bevel gear that meshes with the first bevel gear. The top of the first connecting block is fixedly connected to the bottom of the first drive shaft. The cross-sections of both the first and second connecting blocks are annular. The second connecting block fits onto the outside of the first connecting block. The outer wall of the second connecting block is provided with a reciprocating structure. The second connecting block is connected to the first connecting block through the reciprocating structure and reciprocates in the height direction when the first connecting block rotates. The wall surface of the second connecting block located outside the reciprocating structure is provided with a clamping structure for clamping the lead wire.

[0006] As a further improvement of the present invention, the reciprocating structure includes a first protrusion, a second protrusion, a connecting plate, a guide rod, and a spring. The outer wall of the first connecting block is circumferentially provided with at least two upwardly protruding first protrusions. The two sides of each first protrusion are first inclined surfaces, and the end face of the first protrusion located between the two first inclined surfaces is a first plane. The projection of the first inclined surface onto a plane perpendicular to the radial direction of the first connecting block is an oblique line, and the projection of the first inclined surface onto a plane perpendicular to the axial direction of the first connecting block is fan-shaped. The outer wall of the second connecting block is circumferentially provided with at least two downwardly protruding second protrusions. The two sides of each second protrusion are second inclined surfaces, and the second protrusion is located between the two first inclined surfaces. The end face between the two inclined planes is the second plane. The projection of the second inclined plane onto the plane perpendicular to the radial direction of the second connecting block is an oblique line. The projection of the first inclined plane onto the plane perpendicular to the axial direction of the first connecting block is fan-shaped. The cross-section of the connecting plate is annular and fixedly connected to the outside of the second connecting block. The connecting plate has at least two through holes around its circumference. The guide rod is fitted through the through holes. The top end of the guide rod is fixedly connected to the connecting seat. The spring is sleeved on the outer side of the portion of the guide rod above the through hole. The bottom end of the spring abuts against the top surface of the connecting plate outside the through hole. The end of the guide rod below the through hole is fixedly connected to a nut abutting against the bottom surface of the connecting plate.

[0007] As a further improvement of the present invention, the clamping structure includes a positioning block, a first slider, and a clamping block. At least two positioning blocks are provided circumferentially on the outer wall of the second connecting block. The positioning block has an L-shaped cross-section. The bottom part of the positioning block extends to a position below the middle of the first connecting block. A first sliding groove is provided in the bottom of the positioning block. The first slider is fitted into the first sliding groove. The clamping block is fixedly connected to the end of the first slider near the middle of the first connecting block. A through groove is provided at the bottom of the vertical part of the positioning block. A swing block is connected to the through groove via a rotating shaft. A first protrusion is provided at one end of the swing block. The cross-section of the first protrusion is triangular. A ring of second protrusions is fixedly connected to the outer wall of the first connecting block. The projection of the second protrusion on a plane parallel to the central axis of the first connecting block is triangular. The sidewalls of the first protrusion and the second protrusion are in contact with each other. A first connecting arm is connected to the end of the first slider away from the clamping block via a rotating shaft. A second connecting arm is connected to the end of the first connecting arm away from the first slider via a rotating shaft. The top end of the second connecting arm is fixedly connected to the bottom end of the swing block.

[0008] As a further improvement of the present invention, the driving assembly includes a second motor, a gear set, and a first cam. A protective shell is fixedly connected to one side of the bottom end of the connecting seat. The second motor is fixedly connected to the top of the protective shell. The gear set is disposed inside the protective shell. The output end of the second motor passes through the protective shell and is fixedly connected to the gear at the input end of the gear set. A second transmission shaft is fixedly connected to the gear at the output end of the gear set. The first cam is fixedly connected to the end of the second transmission shaft away from the gear set. One side of the adjusting structure is connected to the first cam via a rotating shaft and in an eccentric connection. A first slide rail is fixedly connected to the other side of the bottom end of the connecting seat. A second slider is fitted on the surface of the first slide rail. The other side of the adjusting structure is fixedly connected to the second slider. The top end of the second slider is connected to a stop assembly.

[0009] As a further improvement of the present invention, the adjustment structure includes a first fixed seat and a snap-fit ​​block. One side of the first fixed seat is connected to the first cam via a rotating shaft and in an eccentric connection. The other side of the first fixed seat is fixedly connected to the second slider. Snap-fit ​​blocks are integrally formed at both the upper and lower ends of the first fixed seat. The cross-section of the snap-fit ​​block near the middle of the first fixed seat is C-shaped. The welding head fits into the middle of the snap-fit ​​block. A connection hole is provided on one side of the snap-fit ​​block.

[0010] As a further improvement of the present invention, the stop assembly includes a transmission structure, a first fixed frame, and a stop member. The input end of the transmission structure is connected to a second slider. The first fixed frame is fixedly connected to the inner wall of the connecting seat near the first slide rail. A second slide rail is fixedly connected to one side of the first fixed frame. A third slider is fitted onto the surface of the second slide rail. A lead screw is provided in the space outside the third slider of the connecting seat. One end of the lead screw is fitted onto the connecting seat, and the other end of the lead screw is fixedly connected to the output end of the transmission structure. The lead screw nut is fixedly connected to the third slider. A second fixed seat is fixedly connected to the other side of the first fixed frame. A second groove is provided in the second fixed seat. The stop member is fitted into the second groove and fixedly connected to the other end of the lead screw nut.

[0011] As a further improvement of the present invention, the transmission structure includes a third connecting arm, a third transmission shaft, and a second cam. One end of the third connecting arm is fixedly connected to the top of the second slider. A second fixing frame located outside the third connecting arm is fixedly connected to the inner wall of the connecting seat. The third transmission shaft is connected to the second fixing frame through a bearing. The third transmission shaft is connected to one end of a lead screw through a coupling. The second cam is fixedly connected to the end of the third transmission shaft near the second fixing frame. The other end of the third connecting arm is eccentrically connected to the second cam through a rotating shaft.

[0012] As a further improvement of the present invention, the stop member includes a third connecting block, a pin, and a hook. The third connecting block is fitted into the second sliding groove. One end of the third connecting block is fixedly connected to the lead screw nut. One end of the pin is fixedly connected to the wall surface of the second fixing seat located below the second sliding groove. One end of the hook is fixedly connected to the other end of the third connecting block. The part of the hook with a hook-like structure is located outside the second fixing seat and above the pin.

[0013] The beneficial effects of this invention are as follows: the wire bonding device can pull the lead wire from the first lead hole to the outside of the first lead hole through the wire pulling assembly, realizing automatic wire transmission; at the same time, the bonding head on the adjustment structure is driven by the drive assembly to reciprocate in the height direction, and connects the various pins, lead frames and chips inside the package body with the lead wire passing through the bottom of the second lead hole; when the bonding head bonds the lead wire to the various pins, lead frames and chips inside the package body, the stop assembly can fix the lead wire above the bonding head, thereby controlling the length of the lead wire passing through the bottom of the bonding head, thus ensuring that the length of the lead wire extending outside the bonding head remains unchanged, and making it convenient for the bonding head to disconnect the lead wire at the bonding point after bonding the lead wire. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the lead wire welding device. Figure 1 .

[0015] Figure 2 This is a schematic diagram of the lead wire welding device. Figure 2 .

[0016] Figure 3 This is a schematic diagram of the drawstring assembly.

[0017] Figure 4 This is a schematic diagram of the structure of the cable assembly located at the bottom of the first drive shaft.

[0018] Figure 5 This is a schematic diagram of a reciprocating structure.

[0019] Figure 6 This is a schematic diagram of the clamping structure.

[0020] Figure 7 This is a schematic diagram of the drive component.

[0021] Figure 8 Structural diagram for adjusting the structure Figure 1 .

[0022] Figure 9 Structural diagram for adjusting the structure Figure 2 .

[0023] Figure 10 This is a schematic diagram of the stop component.

[0024] Figure 11 This is a schematic diagram of the transmission structure.

[0025] Figure 12 A schematic diagram of the stop component.

[0026] In the diagram, 1. Connecting seat; 11. Mating hole; 12. First drive shaft; 121. First lead wire hole; 122. Second bevel gear; 13. Protective shell; 14. First fixing frame; 2. Pull wire assembly; 21. First motor; 211. First bevel gear; 22. First connecting block; 221. Second protrusion; 23. Second connecting block; 24. Clamping structure; 241. Positioning block; 2411. First slide groove; 2412. Through groove; 242. First slider; 243. Clamping block; 244. Swing block; 2441. First protrusion; 245. First connecting arm; 246. Second connecting arm; 25. Reciprocating structure; 251. First protrusion; 2511. First inclined surface; 2512. First plane; 252. Second protrusion; 2521. Second inclined surface; 2522. Second plane; 253. Connecting plate 2531, Through hole; 254, Guide rod; 255, Spring; 256, Nut; 3, Drive assembly; 31, Second motor; 32, Gear set; 33, First cam; 34, Second drive shaft; 35, First slide rail; 36, Second slider; 4, Adjustment structure; 41, First fixed seat; 42, Snap-fit ​​block; 421, Connecting hole; 5, Welding head; 51, Second lead wire hole; 6, Stop assembly; 61, Transmission structure; 611, Third connecting arm; 612, Third drive shaft; 613, Second cam; 614, Second fixed frame; 62, First fixed frame; 63, Stop component; 631, Third connecting block; 632, Ejector pin; 633, Hook; 64, Second slide rail; 65, Third slider; 66, Lead screw; 661, Lead screw nut; 67, Second fixed seat; 671, Second slide groove. Detailed Implementation

[0027] The embodiments of the present invention will now be described in conjunction with the accompanying drawings and related examples: This invention discloses a wire bonding apparatus for semiconductor packaging, such as... Figure 1 The diagram is shown in combination with the following: A connecting seat 1, one end of which is fixedly connected to an external driving device, and the other end of the connecting seat 1 is provided with a mating hole 11 in the middle, and a first transmission shaft 12 is mated in the mating hole 11 through a bearing, and a first lead wire hole 121 is provided in the middle of the first transmission shaft 12. The pull wire assembly 2 is distributed on both the wall surface of the connecting seat 1 near the top of the first drive shaft 12 and at the bottom of the first drive shaft 12. The portion of the pull wire assembly 2 distributed on the wall surface of the connecting seat 1 near the top of the first drive shaft 12 drives the first drive shaft 12 to rotate. When the first drive shaft 12 rotates, the movable end of the portion of the pull wire assembly 2 distributed at the bottom of the first drive shaft 12 reciprocates in the height direction and pulls out the lead wire in the first lead wire hole 121. The drive assembly 3 is disposed on one side of the bottom end of the connector 1. The output end of the drive assembly 3 is fixedly connected to the adjustment structure 4. The adjustment structure 4 is fixedly connected to the welding head 5. The drive assembly 3 drives the welding head 5 to reciprocate in the height direction. The welding head 5 is provided with a second lead wire hole 51 in the middle. The lead wire pulled out from the first lead wire hole 121 enters from the top of the second lead wire hole 51 and exits from the bottom of the second lead wire hole 51. The stop component 6 is located on the other side of the bottom end of the connecting seat 1. The stop component 6 is connected to the adjustment structure 4 and, driven by the drive component 3, its movable end clamps and fixes the lead wire located between the first lead wire hole 121 and the second lead wire hole 51.

[0028] It should be noted that the external drive device connected to the wire welding device is a transmission device capable of moving the wire welding device horizontally and vertically, such as a transmission device with transmission components such as a cylinder, synchronous belt module, and lead screw 66. Before use, the wire is first inserted from the top of the first wire hole 121 into the middle of the first drive shaft 12, then out from the bottom of the first wire hole 121, and then inserted from the top of the second wire hole 51 into the middle of the welding head 5, with the wire between the first wire hole 121 and the second wire hole 51 close to the end of the stop assembly 6. During operation, the wire welding device drives the first drive shaft 12 to rotate through the portion of the wire pulling assembly 2 distributed on the wall near the top of the connecting seat 1, causing the movable end of the portion of the wire pulling assembly 2 distributed at the bottom of the first drive shaft 12 to move at a high position. In addition to reciprocating in the vertical direction, the wire pull assembly 2, located at the bottom of the first drive shaft 12, clamps the lead wire and pulls the lead wire from the first lead wire hole 121 out of the first lead wire hole 121 during downward movement, thereby achieving automatic lead wire transmission. At the same time, the welding head 5 on the adjustment structure 4 is driven by the drive assembly 3 to reciprocate in the vertical direction, thereby connecting the various pins, lead frames, and chips inside the package body with the lead wire passing through the bottom of the second lead wire hole 51. When the welding head 5 welds the lead wire to the various pins, lead frames, and chips inside the package body, the stop assembly 6 can fix the lead wire above the welding head 5, thereby controlling the length of the lead wire passing through the bottom of the welding head 5, ensuring that the length of the lead wire extending out of the welding head 5 remains unchanged, and making it easy for the welding head 5 to disconnect the lead wire at the welding point after welding.

[0029] It needs to be further explained that, such as Figures 1-4 As shown, the wire pulling assembly 2 includes a first motor 21, a first connecting block 22, a second connecting block 23, and a clamping structure 24. The first motor 21 is fixedly connected to the wall of the connecting seat 1 near the top of the first drive shaft 12. The output end of the first motor 21 extends into the top of the connecting seat 1 and is fixedly connected to a first bevel gear 211. The top of the first drive shaft 12 is fitted with a second bevel gear 122 that meshes with the first bevel gear 211. The top of the first connecting block 22 is fixedly connected to the bottom of the first drive shaft 12. Both the first connecting block 22 and the second connecting block 23 have annular cross-sections. The second connecting block 23 fits on the outside of the first connecting block 22. The outer wall of the second connecting block 23 is provided with a reciprocating structure 25. The second connecting block 23 is connected to the first connecting block 22 through the reciprocating structure 25 and moves reciprocally in the height direction when the first connecting block 22 rotates. The wall of the second connecting block 23 located outside the reciprocating structure 25 is provided with a clamping structure 24 for clamping the lead wire.

[0030] Specifically, the first motor 21 drives the first bevel gear 211 to rotate, and the meshing between the first bevel gear 211 and the second bevel gear 122 realizes the transmission to the first drive shaft 12. During the rotation of the first drive shaft 12, the first connecting block 22 will be driven to rotate. The second connecting block 23 is connected to the first connecting block 22 through the reciprocating structure 25, thus realizing the transmission to the second connecting block 23. This causes the movable end of the part at the bottom of the first drive shaft 12 to reciprocate in the height direction. When the second connecting block 23 moves downward, the clamping structure 24 clamps the lead wire in the first lead wire hole 121 and drives the lead wire to move downward, thereby pulling the lead wire out below the first lead wire hole 121, thus realizing the automatic transmission of the lead wire to the welding head 5.

[0031] Specifically, such as Figures 3-6 As shown, the reciprocating structure 25 includes a first protrusion 251, a second protrusion 252, a connecting plate 253, a guide rod 254, and a spring 255. The outer wall of the first connecting block 22 has at least two upwardly protruding first protrusions 251 circumferentially. The two sides of each first protrusion 251 are first inclined surfaces 2511, and the end face of the first protrusion 251 located between the two first inclined surfaces 2511 is a first plane 2512. The projection of the first inclined surface 2511 onto a plane perpendicular to the radial direction of the first connecting block 22 is an oblique line, and the projection of the first inclined surface 2511 onto a plane perpendicular to the axial direction of the first connecting block 22 is fan-shaped. The outer wall of the second connecting block 23 has at least two downwardly protruding second protrusions 252 circumferentially. The two sides of each second protrusion 252 are second inclined surfaces 2521, and the second protrusion 252 is located between the two second inclined surfaces 2521. The end face between them is the second plane 2522. The projection of the second inclined plane 2521 on the plane perpendicular to the radial direction of the second connecting block 23 is an oblique line. The projection of the first inclined plane 2511 on the plane perpendicular to the axial direction of the first connecting block 22 is fan-shaped. The cross-section of the connecting plate 253 is annular and fixedly connected to the outside of the second connecting block 23. The connecting plate 253 is provided with at least two through holes 2531 around its circumference. The guide rod 254 is fitted through the through hole 2531. The top end of the guide rod 254 is fixedly connected to the connecting seat 1. The spring 255 is sleeved on the outer part of the guide rod 254 located above the through hole 2531. The bottom end of the spring 255 abuts against the top surface of the connecting plate 253 located outside the through hole 2531. The end of the guide rod 254 located below the through hole 2531 is fixedly connected with a nut 256 abutting against the bottom surface of the connecting plate 253.

[0032] The first connecting block 22 rotates under the drive of the first drive shaft 12. When the first connecting block 22 rotates, its first protrusion 251 will press against the second protrusion 252 on the second connecting block 23. The part of the second protrusion 252 located on the second inclined surface 2521 is pressed by the part of the first protrusion 251 located on the first inclined surface 2511, thereby causing relative movement between the first connecting block 22 and the second connecting block 23. When the first plane 2512 and the second plane 2522 are aligned, the second connecting block 23 is at a high... The first connecting block 23 is at its highest position in the direction of rotation, while the clamping structure 24 does not clamp the lead wire, and the spring 255 is in a compressed state. After the first connecting block 22 rotates, the spring 255 begins to return to its original state, and the first inclined surface 2511 and the second inclined surface 2521 come into contact with each other and generate relative movement, thereby causing the second connecting block 23 to move downward. At this time, the clamping structure 24 clamps the lead wire and moves downward under the drive of the second connecting block 23, pulling the lead wire out below the first lead wire hole 121 to realize the automatic transmission of the lead wire to the welding head 5.

[0033] More specifically, such as Figures 3-6 As shown, the clamping structure 24 includes a positioning block 241, a first slider 242, and a clamping block 243. At least two positioning blocks 241 are circumferentially arranged on the outer wall of the second connecting block 23. The cross-section of each positioning block 241 is L-shaped. The bottom portion of each positioning block 241 extends to a position below the middle of the first connecting block 22. A first sliding groove 2411 is provided in the bottom of the positioning block 241, and the first slider 242 is fitted into the first sliding groove 2411. The clamping block 243 is fixedly connected to the end of the first slider 242 near the middle of the first connecting block 22. A through groove 2412 is provided at the bottom of the vertical portion of the positioning block 241, and a swing block 244 is connected to the through groove 2412 via a rotating shaft. One end of the swing block 244 is provided with a first protrusion 2441, the cross-section of the first protrusion 2441 is triangular, a ring of second protrusions 221 is fixedly connected to the outer wall of the first connecting block 22, the projection of the second protrusion 221 on the plane parallel to the central axis of the first connecting block 22 is triangular, the side walls of the first protrusion 2441 and the second protrusion 221 are in contact with each other, the end of the first slider 242 away from the clamping block 243 is connected to a first connecting arm 245 through a pivot, the end of the first connecting arm 245 away from the first slider 242 is connected to a second connecting arm 246 through a pivot, and the top end of the second connecting arm 246 is fixedly connected to the bottom end of the swing block 244.

[0034] When the second connecting block 23 is at its highest position in the height direction, the sidewall of the bottom of the first protrusion 2441 is in contact with the surface of the second protrusion 221, while the part of the swing block 244 away from the connection with the positioning block 241 is outside the through groove 2412, and the first slider 242 is located on the side of the first slide groove 2411 near the swing block 244. At this time, the clamping block 243 does not clamp the lead wire below the first lead wire hole 121. As the first connecting block 22 rotates and drives the second connecting block 23 to move downward, the positioning block 241 moves downward as a whole, causing the swing block 244 and the first protrusion 2441 to move downward, while the swing block 244... Under its own weight, the sidewall of the downward-moving first protrusion 2441 remains in contact with the surface of the second protrusion 221, and the first slider 242 is pushed to move in the first groove 2411 by the first connecting arm 245 and the second connecting arm 246. This causes the first slider 242 to move away from the swing block 244 in the first groove 2411, so that the clamping block 243 moves towards the lead wire and clamps the lead wire. At the same time, it also moves downward under the drive of the second connecting block 23, thereby pulling the lead wire in the first lead wire hole 121 out to below the first lead wire hole 121. Through the continuous cycle of the above actions, the lead wire is automatically transferred to the welding head 5.

[0035] It needs to be further explained that, such as Figure 2 , Figure 7 and Figure 8 As shown, the drive assembly 3 includes a second motor 31, a gear set 32, and a first cam 33. A protective shell 13 is fixedly connected to one side of the bottom end of the connecting seat 1. The second motor 31 is fixedly connected to the top of the protective shell 13. The gear set 32 ​​is disposed inside the protective shell 13. The output end of the second motor 31 passes through the protective shell 13 and is fixedly connected to the gear at the input end of the gear set 32. A second transmission shaft 34 is fixedly connected to the gear at the output end of the gear set 32. The first cam 33 is fixedly connected to the end of the second transmission shaft 34 away from the gear set 32. One side of the adjustment structure 4 is connected to the first cam 33 via a rotating shaft in an eccentric connection. A first slide rail 35 is fixedly connected to the other side of the bottom end of the connecting seat 1. A second slider 36 is fitted on the surface of the first slide rail 35. The other side of the adjustment structure 4 is fixedly connected to the second slider 36. The top end of the second slider 36 is connected to the stop assembly 6.

[0036] The second motor 31 operates and transmits power to the gear set 32. Power is transmitted through the gear set 32 ​​to the second drive shaft 34, causing the second drive shaft 34 and the cam to rotate. This, in turn, drives the adjustment structure 4 and the welding head 5 to reciprocate in the height direction. After the welding head 5 welds the lead to the semiconductor pin to form the first welding point, the welding head 5 is moved upwards, causing the lead to exit from the bottom of the welding head 5. After being moved to the position of the second welding point by an external drive device, the welding head 5 is moved downwards, causing the head of the welding head 5 to reach the designated welding point of the lead, welding the lead to the lead frame to form the second welding point. This achieves the connection of the lead to the package. The internal pins, lead frames, and chips are connected; as the soldering head 5 moves upward, the stop component 6 fixes the lead wires above the soldering head 5, thereby controlling the length of the lead wires extending from the bottom of the soldering head 5, and ensuring that the length of the lead wires extending out of the soldering head 5 remains unchanged; after the lead wires are soldered to the second soldering point, the stop component 6 fixes the part of the lead wires inside the soldering head 5, which not only facilitates the disconnection of the lead wires as the soldering head 5 moves away from the second soldering point, but also prevents the lead wires entering from the top of the soldering head 5 from breaking, so that the lead wires required by the soldering head 5 can continue to be transmitted to the second lead hole 51 in the next soldering operation.

[0037] Specifically, such as Figures 7-9 As shown, the adjustment structure 4 includes a first fixed seat 41 and a snap-fit ​​block 42. One side of the first fixed seat 41 is connected to the first cam 33 via a rotating shaft and in an eccentric connection. The other side of the first fixed seat 41 is fixedly connected to the second slider 36. Snap-fit ​​blocks 42 are integrally formed at both the upper and lower ends of the first fixed seat 41. The cross-section of the snap-fit ​​block 42 near the middle of the first fixed seat 41 is C-shaped. The welding head 5 is fitted into the middle of the snap-fit ​​block 42. A connection hole 421 is provided on one side of the snap-fit ​​block 42.

[0038] In this process, by adjusting the position of the welding head 5 outside the connection hole 421 in the snap-fit ​​block 42, and then fitting a fixing piece (not shown in the figure) into the connection hole 421, the welding head 5 is fixed on the first fixing seat 41. This allows the position of the welding head 5 to be adjusted so that it can adapt to the welding requirements of lead wires of different lengths. It also makes it convenient to replace the welding head 5 when it is damaged.

[0039] Specifically, such as Figure 2 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 and 12As shown, the stop assembly 6 includes a transmission structure 61, a first fixing frame 6214, and a stop member 63. The input end of the transmission structure 61 is connected to the second slider 36. The first fixing frame 6214 is fixedly connected to the inner wall of the connecting seat 1 near the first slide rail 35. A second slide rail 64 is fixedly connected to one side of the first fixing frame 6214. A third slider 65 is fitted on the surface of the second slide rail 64. A lead screw 66 is provided in the space outside the third slider 65 of the connecting seat 1. One end of the lead screw 66 is fitted to the connecting seat 1, and the other end of the lead screw 66 is fixedly connected to the output end of the transmission structure 61. The lead screw nut 661 of the lead screw 66 is fixedly connected to the third slider 65. A second fixing seat 67 is fixedly connected to the other side of the first fixing frame 6214. A second slide groove 671 is provided in the second fixing seat 67. The stop member 63 is fitted in the second slide groove 671 and fixedly connected to the other end of the lead screw nut 661.

[0040] When the welding head 5 moves upward, the second slider 36 moves upward on the first slide rail 35 and drives the transmission structure 61. Then, the transmission structure 61 drives the lead screw 66 to rotate. The lead screw 66 then drives the stop member 63 to move in the second slide groove 671, thereby fixing the lead wire above the welding head 5. This controls the length of the lead wire extending from the bottom of the welding head 5, ensures that the length of the lead wire extending out of the welding head 5 remains unchanged, facilitates the disconnection of the lead wire, and ensures that the lead wire required by the welding head 5 can continue to be transmitted to the second lead wire hole 51 in the next welding operation.

[0041] More specifically, such as Figure 2 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 and 12 As shown, the transmission structure 61 includes a third connecting arm 611, a third transmission shaft 612, and a second cam 613. One end of the third connecting arm 611 is fixedly connected to the top of the second slider 36. A second fixing frame 614 located outside the third connecting arm 611 is fixedly connected to the inner wall of the connecting seat 1. The third transmission shaft 612 is connected to the second fixing frame 614 through a bearing. The third transmission shaft 612 is connected to one end of the lead screw 66 through a coupling. The second cam 613 is fixedly connected to the end of the third transmission shaft 612 near the second fixing frame 614. The other end of the third connecting arm 611 is eccentrically connected to the second cam 613 through a rotating shaft.

[0042] When the welding head 5 moves upward, the second slider 36 moves upward on the first slide rail 35 and drives the third connecting arm 611 to move upward. Then, through the connection between the third connecting arm 611 and the second cam 613, the second cam 613 rotates. Through the rotation of the second cam 613 and the connection between the second cam 613 and the lead screw 66, the transmission to the lead screw 66 is realized and the lead screw 66 rotates, so as to drive the stop member 63 to move in the second slide groove 671.

[0043] Furthermore, such as Figure 2 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 and 12 As shown, the stop member 63 includes a third connecting block 631, a pin 632, and a hook 633. The third connecting block 631 is fitted into the second sliding groove 671. One end of the third connecting block 631 is fixedly connected to the lead screw nut 661. One end of the pin 632 is fixedly connected to the wall surface of the second fixing seat 67 located below the second sliding groove 671. One end of the hook 633 is fixedly connected to the other end of the third connecting block 631. The hook-shaped part of the hook 633 is located outside the second fixing seat 67 and above the pin 632.

[0044] When the welding head 5 moves upward, the lead screw 66 rotates and drives the lead screw nut 661 to move along the length of the lead screw 66. The third connecting block 631 connected to the lead screw nut 661 moves with the lead screw nut 661. During the upward movement of the welding head 5, the third connecting block 631 drives the hook-shaped part of the hook 633 to move towards the lead wire. When the welding head 5 reaches the highest position, the hook-shaped part of the hook 633 presses and fixes the lead wire to the end of the ejector pin 632, thereby achieving the effect of fixing the lead wire above the welding head 5.

[0045] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A wire bonding apparatus for semiconductor packaging, characterized in that, include: A connecting seat, one end of which is fixedly connected to an external driving device, and the other end of the connecting seat has a mating hole in the middle, and a first transmission shaft is mated in the mating hole through a bearing, and the first transmission shaft has a first lead hole in the middle. A pull wire assembly is distributed on both the wall surface near the top of the first drive shaft and the bottom of the first drive shaft of the connecting seat. The portion of the pull wire assembly distributed on the wall surface near the top of the first drive shaft drives the first drive shaft to rotate. When the first drive shaft rotates, the movable end of the portion of the pull wire assembly distributed at the bottom of the first drive shaft reciprocates in the height direction and pulls the lead wire out of the first lead wire hole. A drive assembly is disposed on one side of the bottom end of the connector. An adjustment structure is fixedly connected to the output end of the drive assembly. A welding head is fixedly connected to the adjustment structure. The drive assembly drives the welding head to reciprocate in the height direction. A second lead wire hole is provided in the middle of the welding head. A lead wire pulled out from the first lead wire hole enters from the top of the second lead wire hole and exits from the bottom of the second lead wire hole. A stop assembly is disposed on the other side of the bottom end of the connector. The stop assembly is connected to the adjustment structure and, driven by the drive assembly, its movable end clamps and fixes the lead wire located between the first lead wire hole and the second lead wire hole.

2. The lead wire welding device according to claim 1, characterized in that, The wire pulling assembly includes a first motor, a first connecting block, a second connecting block, and a clamping structure. The first motor is fixedly connected to the wall of the connecting seat near the top of the first drive shaft. The output end of the first motor extends into the top of the connecting seat and is fixedly connected to a first bevel gear. The top of the first drive shaft is fitted with a second bevel gear that meshes with the first bevel gear. The top of the first connecting block is fixedly connected to the bottom of the first drive shaft. Both the first and second connecting blocks have annular cross-sections. The second connecting block fits onto the outside of the first connecting block. The outer wall of the second connecting block is provided with a reciprocating structure. The second connecting block is connected to the first connecting block through the reciprocating structure and moves reciprocally in the height direction when the first connecting block rotates. The wall of the second connecting block located outside the reciprocating structure is provided with a clamping structure for clamping the lead wire.

3. The lead wire welding device according to claim 2, characterized in that, The reciprocating structure includes a first protrusion, a second protrusion, a connecting plate, a guide rod, and a spring. The outer wall of the first connecting block has at least two upward-protruding first protrusions circumferentially. The two sides of each first protrusion are first inclined surfaces, and the end face of the first protrusion located between the two first inclined surfaces is a first plane. The projection of the first inclined surface onto a plane perpendicular to the radial direction of the first connecting block is an oblique line, and the projection of the first inclined surface onto a plane perpendicular to the axial direction of the first connecting block is fan-shaped. The outer wall of the second connecting block has at least two downward-protruding second protrusions circumferentially. The two sides of each second protrusion are second inclined surfaces, and the second protrusion is located between the two second inclined surfaces. The end face is the second plane. The projection of the second inclined plane on the plane perpendicular to the radial direction of the second connecting block is an oblique line. The projection of the first inclined plane on the plane perpendicular to the axial direction of the first connecting block is fan-shaped. The cross-section of the connecting plate is annular and fixedly connected to the outside of the second connecting block. The connecting plate has at least two through holes around its circumference. The guide rod is fitted through the through holes. The top end of the guide rod is fixedly connected to the connecting seat. The spring is sleeved on the outer part of the guide rod located above the through hole. The bottom end of the spring abuts against the top surface of the connecting plate located outside the through hole. The end of the guide rod located below the through hole is fixedly connected to a nut abutting against the bottom surface of the connecting plate.

4. The lead wire welding device according to claim 3, characterized in that, The clamping structure includes a positioning block, a first slider, and a clamping block. At least two positioning blocks are circumferentially arranged on the outer wall of the second connecting block. The positioning block has an L-shaped cross-section, with its bottom portion extending to a position below the middle of the first connecting block. A first groove is provided in the bottom of the positioning block, and the first slider engages within this groove. The clamping block is fixedly connected to the end of the first slider near the middle of the first connecting block. A through groove is provided at the bottom of the vertical portion of the positioning block, and a swing block is connected to the through groove via a rotating shaft. One end of the swing block has a first protrusion with a triangular cross-section. A ring of second protrusions is fixedly connected to the outer wall of the first connecting block. The projection of the second protrusions onto a plane parallel to the central axis of the first connecting block is triangular. The sidewalls of the first and second protrusions are in contact with each other. A first connecting arm is connected to the end of the first slider away from the clamping block via a rotating shaft. A second connecting arm is connected to the end of the first connecting arm away from the first slider via a rotating shaft. The top end of the second connecting arm is fixedly connected to the bottom end of the swing block.

5. The lead wire welding device according to claim 1, characterized in that, The drive assembly includes a second motor, a gear set, and a first cam. A protective shell is fixedly connected to one side of the bottom end of the connecting seat. The second motor is fixedly connected to the top of the protective shell. The gear set is disposed inside the protective shell. The output end of the second motor passes through the protective shell and is fixedly connected to the gear at the input end of the gear set. A second drive shaft is fixedly connected to the gear at the output end of the gear set. The first cam is fixedly connected to the end of the second drive shaft away from the gear set. One side of the adjustment structure is connected to the first cam via a rotating shaft in an eccentric connection. A first slide rail is fixedly connected to the other side of the bottom end of the connecting seat. A second slider is fitted on the surface of the first slide rail. The other side of the adjustment structure is fixedly connected to the second slider. The top end of the second slider is connected to a stop assembly.

6. The lead wire bonding apparatus according to claim 5, characterized in that, The adjustment structure includes a first fixed seat and a snap-fit ​​block. One side of the first fixed seat is connected to the first cam via a rotating shaft and in an eccentric connection. The other side of the first fixed seat is fixedly connected to the second slider. Snap-fit ​​blocks are integrally formed at both the upper and lower ends of the first fixed seat. The cross-section of the snap-fit ​​block near the middle of the first fixed seat is C-shaped. The welding head fits into the middle of the snap-fit ​​block. A connection hole is provided on one side of the snap-fit ​​block.

7. The lead wire bonding apparatus according to claim 5, characterized in that, The stop assembly includes a transmission structure, a first fixed frame, and a stop member. The input end of the transmission structure is connected to a second slider. The first fixed frame is fixedly connected to the inner wall of the connecting seat near the first slide rail. A second slide rail is fixedly connected to one side of the first fixed frame. A third slider is fitted onto the surface of the second slide rail. A lead screw is provided in the space outside the third slider of the connecting seat. One end of the lead screw is fitted onto the connecting seat, and the other end of the lead screw is fixedly connected to the output end of the transmission structure. The lead screw nut is fixedly connected to the third slider. A second fixed seat is fixedly connected to the other side of the first fixed frame. A second slide groove is provided in the second fixed seat. The stop member is fitted into the second slide groove and fixedly connected to the other end of the lead screw nut.

8. The lead wire bonding apparatus according to claim 7, characterized in that, The transmission structure includes a third connecting arm, a third transmission shaft, and a second cam. One end of the third connecting arm is fixedly connected to the top of the second slider. A second fixed frame located outside the third connecting arm is fixedly connected to the inner wall of the connecting seat. The third transmission shaft is connected to the second fixed frame through a bearing. The third transmission shaft is connected to one end of a lead screw through a coupling. The second cam is fixedly connected to the end of the third transmission shaft near the second fixed frame. The other end of the third connecting arm is eccentrically connected to the second cam through a rotating shaft.

9. The lead wire bonding apparatus according to claim 8, characterized in that, The stop component includes a third connecting block, a ejector pin, and a hook. The third connecting block is fitted into the second slide groove. One end of the third connecting block is fixedly connected to the lead screw nut. One end of the ejector pin is fixedly connected to the wall surface of the second fixing seat located below the second slide groove. One end of the hook is fixedly connected to the other end of the third connecting block. The part of the hook with a hook-like structure is located outside the second fixing seat and above the ejector pin.

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