A high-precision conveying device for gold wire welding machine

Abstract

The invention discloses a high-precision conveying device for a gold wire welding machine, comprising a frame, a conveyor belt, a pulley, a welding mounting seat and a welding machine head. A circuit board carrier is conveyed to a welding station between a front welding table and a rear welding table by a conveying guide rail and a conveyor belt for positioning welding. A positioning abutment plate is provided at the bottom of the conveyor belt of the welding station. A positioning mechanism is installed on the front welding table at the front side of the welding station. The positioning mechanism consists of a linkage mechanism 1 and a linkage mechanism 2. The two contacts of the conductive plug are connected in series with a two-position three-way solenoid valve. The coil is connected in series with a resistor and then connected in parallel with the conductive plug and the two-position three-way solenoid valve. The invention realizes precise conveying and positioning of welding by setting a positioning mechanism in cooperation with a circuit board carrier with a special structure, thereby achieving the purpose of fully automatic welding. The sensor of a traditional fully automatic welding machine is replaced by a mechanical structure, thereby reducing the cost of the equipment and improving the reliability of the gold wire welding machine.

Description

Technical Field

[0001] The invention relates to the technical field of gold wire welding machine structures, and in particular to a high-precision conveying device for a gold wire welding machine. Background Art

[0002] Gold wire welding refers to a method of bonding terminals. The gold wire welding methods can be divided into ball to pressure ring, pressure ring to pressure ring and ball to ball welding. The wire materials are mainly gold, copper and aluminum. The ball to pressure ring welding method is usually carried out by ultrasonic and heating methods. Its working principle is: through the use of ultrasonic friction, under the coordination of pressure and temperature, the gold wire of the solder joint forms a co-crystallization process with the contact surface.

[0003] Existing gold wire welding machines include fully automatic, semi-automatic and manual. The full-automatic gold wire welding machine uses sensors to monitor the entire process, and has high requirements for the control system, which makes its cost too high and is not suitable for production in small enterprises. At the same time, the full-automatic gold wire welding machine has high feeding and conveying accuracy for welding jigs and circuit boards to be welded. If the conveying accuracy cannot be guaranteed, the welding effect is affected. In view of the above problems, the present invention provides a technical solution of a high-precision conveying device based on a mechanical structure. Summary of the invention

[0004] The purpose of the invention is to provide a high-precision conveying device for a gold wire bonding machine.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions:

[0006] A high-precision conveying device for a gold wire welding machine comprises a frame, a conveyor belt, a pulley, a welding mounting seat and a welding head, wherein the conveyor belt and the pulley are mounted on the frame, the pulley is connected to the conveying motor in a transmission manner, the welding mounting seat is located at the rear side above the frame, the welding head is mounted on the welding mounting seat, a conveying guide rail is provided in the middle position of the upper end of the frame, the conveying surface of the conveyor belt is flush with the bottom surface of the conveying guide rail, the circuit board carrier is conveyed to the welding station between the front welding station and the rear welding station by the conveying guide rail and the conveyor belt for positioning welding, a positioning plate is provided at the bottom of the conveyor belt of the welding station, and the circuit board carrier is conveyed to the welding station between the front welding station and the rear welding station by the conveying guide rail and the conveyor belt ... The board carrier comprises a carrier base and an inner carrier seat, the front and rear sides of the carrier base are provided with guide blocks abutting against the conveying guide rail, the inner carrier seat is installed in the installation groove in the middle of the carrier base, the side wall of the installation groove is provided with a fine-tuning locking mechanism for locking and adjusting the position of the inner carrier seat, the upper end of the inner carrier seat is provided with a clamping hole for installing the circuit board to be soldered, the upper end of the inner carrier seat is also provided with a positioning inclined surface, a positioning pressing frame is provided above the circuit board carrier, the size of the middle hole of the positioning pressing frame is adapted to the size of the upper end of the inner carrier seat, rollers are provided at the bottom of the four sides of the middle hole of the positioning pressing frame, and the rollers can be relatively positioned to press The frame is set to roll, and the bottom of the positioning pressure frame is provided with two guide columns on a diagonal line. The guide columns pass through the guide holes on the rear welding table and the front welding table. The bottom ends of the two guide columns are connected by a connecting rod, and the bottom of the connecting rod is connected to the piston rod of the lifting cylinder. The lifting cylinder is installed at the bottom of the mounting cross frame, and the two interfaces of the lifting cylinder are connected to the two air outlets of the two-position three-way electromagnetic reversing valve, and the air inlet of the two-position three-way electromagnetic reversing valve is connected to the air pump; a positioning mechanism is installed on the front welding table on the front side of the welding station, and the positioning mechanism consists of a linkage mechanism 1 and a linkage mechanism 2, and the linkage mechanism 1 includes a wedge The wedge block comprises a wedge-shaped block, a linkage spring 1, a conductive contact block 1, a conductive contact block 2 and a conductive ring, wherein the wedge-shaped end of the wedge block extends into the conveying guide rail of the welding station, the conductive ring is fixedly installed at the other end of the wedge block, and the conductive ring is located between the conductive contact block 1 and the conductive contact block 2, the linkage spring 1 abuts against one end of the wedge block where the conductive ring is installed, when the wedge block is not subjected to external force, the linkage spring 1 pushes the conductive ring to contact the conductive contact block 1 and separate from the conductive contact block 2, the two contacts of the conductive contact block 1 are connected in series to the circuit of the conveying motor, and the two contacts of the conductive contact block 2 are connected in series to the circuit of the two-position three-way electromagnetic reversing valve;The linkage mechanism 2 includes a conductive contact block 3, a connecting rod, an iron core block, a coil, a conductive plug block, an insulating connecting rod, a conductive piston and a conductive plug rod. The conductive contact block 3 is located at the front side of the conductive contact block 1. A through hole is provided in the middle of the conductive contact block 3 for the wedge block to pass through. The conductive contact block 3 is connected to the iron core block through the connecting rod. The iron core block is connected to the conductive piston through the insulating connecting rod. The conductive piston is connected to the delay mechanism. The coil is arranged on the outer side of the insulating connecting rod near one end of the iron core block. The conductive plug block is arranged on the outer side of the insulating connecting rod near one end of the conductive piston. The two conductive plug rods are integrally formed with the conductive piston. The conductive plug block is provided with a socket that matches the conductive plug rod. The delay mechanism pushes the conductive plug rod on the conductive piston to match and conduct with the socket of the conductive plug block. At the same time, the insulating connecting rod drives the iron core block away from the coil. At this time, the distance between the iron core block and the coil is greater than the matching length of the conductive plug rod and the conductive plug block. The two contacts of the conductive plug block are connected in series with the two-position three-way solenoid valve. The coil is connected in series with a resistor and connected in parallel with the conductive plug block and the two-position three-way solenoid valve. ;

[0007] Furthermore, the delay mechanism includes a delay buffer chamber, a second linkage spring, a connecting hole and a liquid storage chamber, the conductive piston is installed at the front of the delay buffer chamber, the second linkage spring is installed at the rear of the delay buffer chamber, the rear of the delay buffer chamber is connected with the liquid outlet chamber through the connecting hole, the delay buffer chamber at the bottom of the conductive piston is filled with liquid by negative pressure, and the ratio of the diameter of the delay buffer chamber to the diameter of the connecting hole is greater than 50:1.

[0008] Furthermore, the fine-tuning locking mechanism includes a fine-tuning roller, a push block, a fine-tuning locking spring and a plug installed in the fine-tuning locking hole, the outer section of the fine-tuning locking hole is a circular hole, and the inner section is an elongated hole, the fine-tuning roller and the push block are installed in the elongated hole, the plug is installed in the circular hole at the outer end of the fine-tuning locking hole by threaded cooperation, and squeezes the fine-tuning locking spring to abut against the push block, and the orifice size of the elongated hole of the fine-tuning locking hole is smaller than the diameter of the roller.

[0009] Furthermore, the ratio of the diameter of the delay buffer cavity to the diameter of the connecting hole is 100:1.

[0010] Furthermore, the conveyor belt is provided with a strip-shaped positioning anti-skid groove, and the bottom of the carrier base is provided with anti-skid teeth that cooperate with the positioning anti-skid groove.

[0011] Furthermore, both sides of the upper end of the inner seat of the carrier are provided with pick-up and placement grooves.

[0012] Furthermore, the single-sided cross-section of the conductive ring is in the shape of an "I", and buffer blocks made of flexible material are provided on the upper and lower sides of the "I"-shaped structure. When the conductive ring contacts and squeezes conductive contact block one or conductive contact block two, the conductive ring squeezes the buffer block to move relative to the wedge block.

[0013] Furthermore, the wedge block is made of insulating ceramic material, and the insulating connecting rod is made of insulating wood.

[0014] Furthermore, the buffer block is made of rubber material.

[0015] Furthermore, the surface where the push block contacts the fine-tuning roller is an arc surface.

[0016] In summary, the present invention has the following beneficial effects:

[0017] 1. The present invention realizes precise conveying and positioning of welding by setting a positioning mechanism in conjunction with a circuit board carrier with a special structure, thereby achieving the purpose of fully automatic welding.

[0018] 2. The present invention replaces the sensor of the traditional full-automatic welding machine with a mechanical structure, thereby reducing the cost of the equipment and improving the reliability of the gold wire welding machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 is a top view of the conveying mechanism portion of the present invention;

[0021] Figure 3 It is a structural schematic diagram of the circuit board carrier part of the present invention;

[0022] Figure 4 is a cross-sectional view of a circuit board carrier portion of the present invention;

[0023] Figure 5 It is a structural schematic diagram of the positioning press frame of the present invention;

[0024] Figure 6 It is a schematic diagram of the positioning press frame lifting structure of the present invention;

[0025] Figure 7 It is a schematic diagram of the fine-tuning locking mechanism part of the present invention;

[0026] Figure 8 It is a structural schematic diagram of the positioning mechanism part of the present invention;

[0027] Fig. 9 It is a structural schematic diagram of a part of the linkage mechanism of the present invention;

[0028] Fig.10 It is a structural schematic diagram of two parts of the linkage mechanism of the present invention;

[0029] Fig.11 It is a circuit control schematic diagram of the present invention.

[0030] In the figure, 1, frame; 2, conveyor belt; 3, pulley; 4, welding mounting seat; 5, welding head; 6, circuit board carrier; 7, positioning pressure frame; 8, positioning plate; 9, rear welding table; 10, front welding table; 11, positioning mechanism; 12, guide hole; 13, conveying guide rail; 14, carrier base; 15, roller; 16, guide block; 17, carrier inner seat; 18, pick-up and place groove; 19, positioning slope; 20, circuit board; 21, guide column; 22, fine-tuning locking mechanism; 23, anti-skid teeth; 24, connecting rod; 25, lifting cylinder; 26, mounting cross frame; 27, fine-tuning roller; 28, push block ; 29. ​​Fine-tuning locking spring; 30. Plug; 31. Wedge block; 32. Linkage spring one; 33. Insulating connecting rod; 34. Linkage spring two; 35. Liquid storage chamber; 36. Conductive contact one; 37. Conductive ring; 38. Conductive contact two; 39. Conductive contact three; 40. Buffer block; 41. Connecting rod; 42. Core block; 43. Coil; 44. Conductive plug; 45. Conductive piston; 46. Conductive plug; 47. Delay buffer chamber; 48. Connecting hole; 49. Linkage mechanism one; 50. Linkage mechanism two; 51. Delay mechanism; 52. Conveying motor; 53. Two-position three-way electromagnetic reversing valve. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] like Figure 1-11 As shown, a high-precision conveying device for a gold wire welding machine comprises a frame 1, a conveyor belt 2, a pulley 3, a welding mounting seat 4 and a welding head 5. The conveyor belt 2 and the pulley 3 are mounted on the frame 1, and the pulley 3 is connected to the conveying motor 52 in transmission. The driving wheel of the pulley 3 is located at the rear end, that is, the unloading end of the conveyor belt 2. The welding mounting seat 4 is located on the rear side above the frame 1. The welding head 5 is mounted on the welding mounting seat 4. The welding head 5 mainly includes the welding structure of the existing gold wire welding machine, such as a porcelain nozzle, a gold wire, an ultrasonic generator, etc., which are not described here. A conveying guide rail 13 is provided in the middle position of the upper end of the frame 1. The conveying surface of the conveyor belt 2 is flush with the bottom surface of the conveying guide rail 13. The conveying guide rails 13 at both ends of the conveyor belt 2 are respectively a loading end and a unloading end. The circuit board carrier 6 is transported to the welding station between the front welding station 10 and the rear welding station 9 through the conveying guide rail 13 and the conveyor belt 2 for positioning welding. Figure 2 and Figure 3As shown, the bottom of the conveyor belt 2 of the welding station is provided with a positioning plate 8, the circuit board carrier 6 includes a carrier base 14 and a carrier inner seat 17, the front and rear sides of the carrier base 14 are provided with guide blocks 16 that abut against the conveying guide rail 13, and the carrier inner seat 17 is installed in the installation groove in the middle of the carrier base 14. Figure 4 As shown, the side wall of the mounting groove is provided with a fine-tuning locking mechanism 22 for locking and adjusting the position of the carrier inner seat 17, the upper end of the carrier inner seat 17 is provided with a clamping hole for installing the circuit board 20 to be soldered, and the upper end of the carrier inner seat 17 is also provided with a positioning inclined surface 19, and a positioning pressing frame 7 is provided above the circuit board carrier 6, and the size of the middle hole of the positioning pressing frame 7 is adapted to the size of the upper end of the carrier inner seat 17, and rollers 15 are provided at the bottom of the four sides of the middle hole of the positioning pressing frame 7, and the rollers 15 can be rolled relative to the positioning pressing frame 17; as shown Figure 5 and Figure 6 As shown, the bottom of the positioning press frame 17 is provided with two guide columns 21 on a diagonal line, and the guide columns 21 pass through the guide holes 12 on the rear welding table 9 and the front welding table 10. The bottom ends of the two guide columns 21 are connected by a connecting rod 24, and the bottom of the connecting rod 24 is connected to the piston rod of the lifting cylinder 25. The lifting cylinder 25 is installed at the bottom of the mounting cross frame 26. The two interfaces of the lifting cylinder 25 are connected to the two air outlets of the two-position three-way electromagnetic reversing valve 53, and the air inlet of the two-position three-way electromagnetic reversing valve 53 is connected to the air pump. The two-position three-way electromagnetic reversing valve 53 and the air pump are both installed inside the frame 1. The specific position is not shown in the drawings of the specification, but it does not affect the understanding of those skilled in the art; a positioning mechanism 11 is installed on the front welding table 10 at the front side of the welding station, such as Figure 7-10As shown, the positioning mechanism 11 is composed of a linkage mechanism 1 49 and a linkage mechanism 2 50. The linkage mechanism 1 49 includes a wedge block 31, a linkage spring 1 32, a conductive contact block 1 36, a conductive contact block 2 38 and a conductive ring 37. The wedge end of the wedge block 31 extends into the conveying guide rail 13 of the welding station, and the extending length of the wedge block 31 is less than or equal to the length of the guide block 16 protruding from the carrier base 14. The conductive ring 37 is fixedly installed at the other end of the wedge block 31, and the conductive ring 37 is located between the conductive contact block 1 36 and the conductive contact block 2 38. The linkage spring 1 32 abuts against the wedge block 31 with the conductive contact block 1 installed thereon. At one end of the conductive ring 37, when the wedge block 31 is not subjected to external force, the linkage spring 1 32 pushes the conductive ring 37 to contact the conductive contact 1 36 and separate from the conductive contact 2 37. The two contacts of the conductive contact 1 36 are connected in series to the circuit of the conveying motor 52, forming a normally closed switch structure in the circuit of the conveying motor 52. The two contacts of the conductive contact 2 38 are connected in series to the circuit of the two-position three-way electromagnetic reversing valve 53, forming a normally open switch structure in the circuit of the two-position three-way electromagnetic reversing valve 53. The linkage mechanism 2 50 includes a conductive contact 3 39, a connecting rod 41, an iron core block 42, a coil 43, a conductive plug 44, an insulator The conductive contact block 39 is located at the front side of the conductive contact block 36. A through hole is provided in the middle of the conductive contact block 39 for the wedge block 31 to pass through. The conductive contact block 39 is connected to the core block 42 through the connecting rod 41. The core block 42 is connected to the conductive piston 45 through the insulating connecting rod 33. The conductive piston 45 is connected to the delay mechanism 51. The coil 43 is arranged on the outer side of the insulating connecting rod 33 near the end of the core block 42. The conductive plug 44 is arranged on the outer side of the insulating connecting rod 33 near the end of the conductive piston 45. The two conductive plugs 46 are connected to the conductive The electric piston 45 is integrally formed, and a socket that cooperates with the conductive plug rod 46 is provided on the conductive plug block 44. The delay mechanism 51 pushes the conductive plug rod on the conductive piston 45 to cooperate with the socket of the conductive plug block 44 to conduct, and at the same time, the insulating connecting rod 33 drives the iron core block 42 away from the coil 43, and at this time, the distance between the iron core block 42 and the coil 43 is greater than the matching length of the conductive plug rod 46 and the conductive plug block 44; the two contacts of the conductive plug block 44 are connected in series with the two-position three-way solenoid valve 53, and the coil 43 is connected in series with a resistor and connected in parallel with the conductive plug block 44 and the two-position three-way solenoid valve 53; through the above-mentioned linkage mechanism 1 49 and linkage mechanism 2 50, as shown in the following Fig.11 The equivalent circuit diagram shown controls the power supply of the conveying motor 52 and the two-position three-way electromagnetic reversing valve 53 respectively.

[0033] Further, the delay mechanism 51 includes a delay buffer chamber 47, a linkage spring 2 34, a connecting hole 48 and a liquid storage chamber 35, the conductive piston 45 is installed at the front of the delay buffer chamber 47, the linkage spring 2 34 is installed at the rear of the delay buffer chamber 47, the rear of the delay buffer chamber 47 is connected with the liquid outlet chamber 35 through the connecting hole 48, the delay buffer chamber 47 at the bottom of the conductive piston 45 is filled with liquid by negative pressure, the diameter of the delay buffer chamber 47 and the diameter of the connecting hole 48 are greater than 50:1, by setting the delay mechanism 51, when the coil 43 is powered on or off, as shown in Fig.11 The linkage mechanism 2 50 in the equivalent circuit shown is delayed for a period of time and then makes corresponding changes.

[0034] Furthermore, the fine-tuning locking mechanism 22 includes a fine-tuning roller 27, a push block 28, a fine-tuning locking spring 29 and a plug 30 installed in the fine-tuning locking hole. The outer section of the fine-tuning locking hole is a circular hole, and the inner section is an elongated hole. The fine-tuning roller 27 and the push block 28 are installed in the elongated hole. The plug 30 is installed in the circular hole at the outer end of the fine-tuning locking hole by threaded cooperation, and squeezes the fine-tuning locking spring 29 to abut against the push block 28. The orifice size of the elongated hole of the fine-tuning locking hole is smaller than the diameter of the roller 15. The position of the inner seat (17) of the circuit board carrier 6 is fine-tuned by combining the above-mentioned fine-tuning mechanism 22 with the positioning pressure frame 7.

[0035] Furthermore, the ratio of the diameter of the delay buffer cavity 47 to the diameter of the connecting hole 48 is 100:1. Preferably, the aperture of the connecting hole 48 is adjustable, such as installing a throttle valve in the hole to adjust the aperture ratio, thereby achieving different delay time settings.

[0036] Furthermore, the conveyor belt 2 is provided with a strip-shaped positioning anti-skid groove, and the bottom of the carrier base 14 is provided with anti-skid teeth 23 that cooperate with the positioning anti-skid groove, which can prevent the carrier and the conveyor belt 2 from having a large relative movement, thereby reducing the positioning accuracy.

[0037] Further, such as Figure 3 As shown, both sides of the upper end of the carrier inner seat 17 are provided with pick-up and placement grooves 18 . The provision of the pick-up and placement grooves 18 is mainly to facilitate the pick-up and placement of the carrier inner seat 17 into the carrier base 14 .

[0038] Further, such as Fig. 9 As shown, the single-sided cross-section of the conductive ring 37 is in the shape of an "I" character, and buffer blocks 40 made of flexible material are provided on the upper and lower sides of the "I"-shaped structure. When the conductive ring 37 contacts and squeezes the conductive contact block 1 36 or the conductive contact block 2 38, the conductive ring 37 squeezes the buffer block 40 to move relative to the wedge block 31. The setting of the buffer block 40 can play a role in replenishing the surplus, thereby avoiding poor contact between the conductive ring 37 and the conductive contact block after a period of use.

[0039] Furthermore, the wedge block 31 is made of insulating ceramic material, and the insulating connecting rod 33 is made of insulating wood, which mainly avoids interference between the circuit of the conveying motor 52 and the circuit of the two-position three-way electromagnetic reversing valve 53.

[0040] Furthermore, the buffer block 40 is made of rubber material. Similarly, the buffer block 40 can also be made of other insulating flexible materials, such as plastic with good insulation properties.

[0041] Further, such as Figure 7 As shown, the contact surface between the push block 28 and the fine-tuning roller 27 is an arc surface, which can make the fine-tuning roller 27 roll while squeezing the push block 28 and the fine-tuning locking spring 29 into the fine-tuning limit hole.

[0042] Working principle: The circuit board carrier 6 loaded with the circuit board to be welded is transported by the conveyor belt 2. When the circuit board carrier 6 is transported to the welding station, the guide block 16 on the carrier base 14 squeezes the wedge block 31, and the wedge block 31 drives the conductive ring 37 to move. The conductive ring 37 is separated from the conductive contact block 1 36 and connected to the conductive contact block 2 38. At this time, the circuit of the conveying motor 52 is disconnected, the conveyor belt 2 stops conveying, the circuit of the two-position three-way electromagnetic reversing valve 53 and the coil 43 is connected, the two-position three-way electromagnetic reversing valve 53 controls the air path reversing of the lifting cylinder 25, and the lifting cylinder 25 drives the positioning press frame 7 to move downward, and the positioning press frame 7 moves downward. During the shifting process, if there is a deviation in the position of the carrier inner seat 17, the roller 15 on the positioning pressure frame 7 first contacts the positioning inclined surface 19 and squeezes the carrier inner seat 17, and the carrier inner seat 17 squeezes the corresponding fine-tuning roller 27 to achieve precise adjustment of the carrier inner seat position. At this time, the welding head 5 of the gold wire welding machine starts to weld the circuit board; at the same time, after the coil 43 is energized, it generates magnetic force to attract the iron core block 42 to drive the conductive piston 45 to move forward. Since the delay buffer chamber 47 is filled with liquid, the conductive piston 45 can only move forward slowly, and the liquid is slowly discharged from the connecting hole 48 into the liquid storage chamber 35. When the conductive plug 46 gradually contacts the conductive plug 46, the conductive plug 46 is gradually connected to the conductive plug 46. During the period when the conductive plug 44 is separated, the welding machine completes welding of the circuit board 20; when the iron core block 42 has not yet contacted the coil 43 (the conductive contact block 39 and the conductive contact block 1 36 have not yet contacted), and the conductive plug rod 46 has been completely separated from the conductive plug 44, the two-position three-way electromagnetic reversing valve 53 is powered off, and the lifting cylinder 25 drives the positioning pressure frame 7 to rise, releasing the positioning clamping of the circuit board carrier 6; the iron core block 42 continues to move forward, and when the conductive contact block 39 and the conductive contact block 1 36 are in contact, the circuit of the conveying motor 52 is turned on, and the conveyor belt 2 moves to continue to convey the circuit board carrier 6 forward. When the guide block 16 leaves the wedge block At position 31, the wedge block 31 extends out of the conveying guide rail 13 under the action of the linkage spring 1 (32), and pushes the conductive ring 37 to contact the conductive contact block 1 36 and separate from the conductive contact block 2 38. At this time, the coil 43 is powered off (the conveying motor 52 continues to be powered, and the two-position three-way solenoid valve reversing valve 53 remains at the end), and the linkage spring 2 34 pushes the conductive piston 45 to move backward, while sucking liquid into the delay buffer chamber 47, and finally the conductive contact block 39 is separated from the conductive contact block 1 36, and the conductive plug rod 46 cooperates with the conductive plug block 44 until the next circuit board carrier 6 is conveyed to the welding station, and the above actions are repeated again.

[0043] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A high-precision conveying device for a gold wire welding machine, comprising a frame (1), a conveyor belt (2), a pulley (3), a welding mounting seat (4) and a welding head (5), wherein the conveyor belt (2) and the pulley (3) are mounted on the frame (1), the pulley (3) is in driving connection with a conveying motor (52), the welding mounting seat (4) is located at the rear side above the frame (1), the welding head (5) is mounted on the welding mounting seat (4), a conveying guide rail (13) is provided at the middle position of the upper end of the frame (1), the conveying surface of the conveyor belt (2) is flush with the bottom surface of the conveying guide rail (13), a circuit board carrier (6) is conveyed to a welding station between a front welding station (10) and a rear welding station (9) by the conveying guide rail (13) and the conveyor belt (2) for positioning welding, characterized in that: The bottom of the conveyor belt (2) of the welding station is provided with a positioning abutment plate (8), the circuit board carrier (6) comprises a carrier base (14) and a carrier inner seat (17), the front and rear sides of the carrier base (14) are provided with guide blocks (16) that abut against the conveying guide rail (13), the carrier inner seat (17) is installed in a mounting groove in the middle of the carrier base (14), the side wall of the mounting groove is provided with a fine-tuning locking mechanism (22) for locking and adjusting the position of the carrier inner seat (17), the upper end of the carrier inner seat (17) is provided with a clamping hole for installing a circuit board (20) to be welded, and the upper end of the carrier inner seat (17) is also provided with a positioning inclined surface (19), the circuit board carrier A positioning press frame (7) is provided above (6), the size of the middle hole of the positioning press frame (7) is adapted to the size of the upper protrusion of the carrier inner seat (17), rollers (15) are provided at the bottom of the four sides of the middle hole of the positioning press frame (7), and the rollers (15) can be rolled relative to the positioning press frame (7), and two guide columns (21) are provided on the diagonal line of the bottom of the positioning press frame (7), and the guide columns (21) pass through the guide holes (12) on the rear welding platform (9) and the front welding platform (10), and the bottom ends of the two guide columns (21) are connected by a connecting rod (24), and the bottom of the connecting rod (24) is connected to the piston rod of the lifting cylinder (25), and the lifting cylinder (25) is installed Installed at the bottom of the mounting cross frame (26), the two interfaces of the lifting cylinder (25) are connected to the two air outlets of the two-position three-way electromagnetic reversing valve (53), and the air inlet of the two-position three-way electromagnetic reversing valve (53) is connected to the air pump; a positioning mechanism (11) is installed on the front welding table (10) at the front side of the welding station, and the positioning mechanism (11) is composed of a linkage mechanism 1 (49) and a linkage mechanism 2 (50), and the linkage mechanism 1 (49) includes a wedge block (31), a linkage spring 1 (32), a conductive contact block 1 (36), a conductive contact block 2 (38) and a conductive ring (37), and the wedge end of the wedge block (31) extends to the conveying guide rail (130) of the welding station. ), the conductive ring (37) is fixedly mounted on the other end of the wedge block (31), and the conductive ring (37) is located between the conductive contact block 1 (36) and the conductive contact block 2 (38), the linkage spring 1 (32) abuts against one end of the wedge block (31) on which the conductive ring (37) is mounted, and when the wedge block (31) is not subjected to external force, the linkage spring 1 (32) pushes the conductive ring (37) to contact the conductive contact block 1 (36) and separate from the conductive contact block 2 (38), the two contacts of the conductive contact block 1 (36) are connected in series to the circuit of the conveying motor (52), and the two contacts of the conductive contact block 2 (38) are connected in series to the circuit of the two-position three-way electromagnetic reversing valve (53);The linkage mechanism 2 (50) comprises a conductive contact block 3 (39), a connecting rod (41), an iron core block (42), a coil (43), a conductive plug block (44), an insulating connecting rod (33), a conductive piston (45) and a conductive plug rod (46); the conductive contact block 3 (39) is located at the front side of the conductive contact block 1 (36); a through hole for the wedge block (31) to pass through is provided in the middle of the conductive contact block 3 (39); the conductive contact block 3 (39) is connected to the iron core block (42) via the connecting rod (41); the iron core block (42) is connected to the conductive piston (45) via the insulating connecting rod (33); the conductive piston (45) is connected to the delay mechanism (51); the coil (43) is arranged on the outer side of the insulating connecting rod (33) near one end of the iron core block (42); the conductive plug block (44) The insulating connecting rod (33) is arranged at one end near the conductive piston (45) on the outside, and the two conductive plug rods (46) are integrally formed with the conductive piston (45). The conductive plug block (44) is provided with a plug hole that matches the conductive plug rod (46). The delay mechanism (51) pushes the conductive plug rod on the conductive piston (45) to match and conduct with the plug hole of the conductive plug block (44). At the same time, the insulating connecting rod (33) drives the iron core block (42) away from the coil (43). At this time, the distance between the iron core block (42) and the coil (43) is greater than the matching length between the conductive plug rod (46) and the conductive plug block (44). The two contacts of the conductive plug block (44) are connected in series with the two-position three-way electromagnetic reversing valve (53). The coil (43) is connected in series with a resistor and then connected in parallel with the conductive plug block (44) and the two-position three-way electromagnetic reversing valve (53).

2. A high-precision conveying device for a gold wire bonding machine according to claim 1, characterized in that: The delay mechanism (51) comprises a delay buffer chamber (47), a second linkage spring (34), a connecting hole (48) and a liquid storage chamber (35); the conductive piston (45) is mounted at the front of the delay buffer chamber (47); the second linkage spring (34) is mounted at the rear of the delay buffer chamber (47); the rear of the delay buffer chamber (47) is connected to the liquid storage chamber (35) via the connecting hole (48); the delay buffer chamber (47) at the bottom of the conductive piston (45) is filled with liquid by means of negative pressure; and the ratio of the diameter of the delay buffer chamber (47) to the diameter of the connecting hole (48) is greater than 50:

1.

3. A high-precision conveying device for a gold wire bonding machine according to claim 2, characterized in that: The fine-tuning locking mechanism (22) comprises a fine-tuning roller (27), a push block (28), a fine-tuning locking spring (29) and a plug (30) installed in a fine-tuning locking hole. The outer section of the fine-tuning locking hole is a circular hole, and the inner section is an elongated hole. The fine-tuning roller (27) and the push block (28) are installed in the elongated hole. The plug (30) is installed in the circular hole at the outer end of the fine-tuning locking hole through threaded engagement, and squeezes the fine-tuning locking spring (29) to abut against the push block (28). The orifice size of the elongated hole of the fine-tuning locking hole is smaller than the diameter of the roller (15).

4. A high-precision conveying device for a gold wire bonding machine according to claim 3, characterized in that: The ratio of the diameter of the delay buffer cavity (47) to the diameter of the connecting hole (48) is 100:

1.

5. A high-precision conveying device for a gold wire bonding machine according to claim 4, characterized in that: The conveyor belt (2) is provided with a strip-shaped positioning anti-skid groove, and the bottom of the carrier base (14) is provided with anti-skid teeth (23) that cooperate with the positioning anti-skid groove.

6. A high-precision conveying device for a gold wire bonding machine according to claim 5, characterized in that: Both sides of the upper end of the carrier inner seat (17) are provided with pick-up and drop-out grooves (18).

7. A high-precision conveying device for a gold wire bonding machine according to claim 6, characterized in that: The single-side cross-section of the conductive ring (37) is in the shape of an "I" character, and buffer blocks (40) made of a flexible material are provided on the upper and lower sides of the "I"-shaped structure. When the conductive ring (37) contacts and squeezes the first conductive contact block (36) or the second conductive contact block (38), the conductive ring (37) squeezes the buffer block (40) to move relative to the wedge block (31).

8. A high-precision conveying device for a gold wire bonding machine according to claim 7, characterized in that: The wedge-shaped block (31) is made of insulating ceramic material, and the insulating connecting rod (33) is made of insulating wood.

9. A high-precision conveying device for a gold wire bonding machine according to claim 7, characterized in that: The buffer block (40) is made of rubber material.

10. A high-precision conveying device for a gold wire bonding machine according to claim 3, characterized in that: The contact surface between the push block (28) and the fine-tuning roller (27) is an arc surface.

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