A non-destructive welding device and welding method for connecting pins used in chip processing

Abstract

The invention relates to the technical field of chip processing devices, and specifically to a non-destructive welding device for connecting pins used for chip processing and a welding method thereof. The welding machine device comprises an assembly frame, a longitudinal adjustment seat and a circuit board mounting table, an axial adjustment seat is installed on the longitudinal adjustment seat, a contact head is arranged at the bottom of the axial adjustment seat, a chip positioning component is arranged at the lower end of the contact head, and a dynamic ring seat which performs intermittent rotating motion of moving and stopping is arranged on the contact head; a left mounting frame and a right mounting frame are installed on the active ring seat; a hot air box is arranged on the left mounting frame, and a hot air gun is arranged on the hot air box; a T-shaped connecting rod is installed on the upper limit sliding of the right mounting frame, and a cleaning brush is fixedly connected to the lower end of the T-shaped connecting rod; the semi-automatic welding assembly can reduce the dependence on manual operation and ensure the accurate alignment of the pins and the pads during the welding process.

Description

Technical Field

[0001] The present invention relates to the technical field of chip processing devices, and in particular to a non-destructive welding device for connecting pins used in chip processing and a welding method thereof. Background Art

[0002] Most mounted chips have many connection pins, which are densely arranged on the side of the chip. During welding, welders need to tighten each welding pin one by one to ensure the welding quality. Using a hot air gun to weld the chip pins can achieve a fast and effective welding process and improve the welding quality and efficiency. At the same time, by precisely controlling the temperature and heating method, it can reduce damage to the chip and ensure welding quality.

[0003] However, the existing soldering devices for chip pins are simple in structure. Generally, the solder paste is evenly applied to the pad first, and then the chip is attached to the corresponding position so that the lower ends of the chip pins are evenly distributed with solder paste. Finally, a hot air gun is used to repeatedly rotate and blow air to heat the pins around the chip. Although this method can improve the welding efficiency to a certain extent, the hot air gun is likely to blow the chip around during the heating process, thereby causing welding errors and deformation. The manual positioning method is likely to increase the operator's unnecessary fatigue and burn risks during high-temperature welding. Summary of the invention

[0004] The object of the present invention is to provide a non-destructive welding device and a welding method for connecting pins used in chip processing, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a non-destructive welding device for connecting pins used for chip processing, comprising an assembly frame, a longitudinal adjustment seat limitedly slidably mounted on the assembly frame, and a circuit board mounting table, wherein the longitudinal adjustment seat is provided with an axial adjustment seat limitedly rotatably mounted, a contact head is fixedly arranged at the bottom of the axial adjustment seat, a chip positioning component is arranged at the lower end of the contact head, and the chip positioning component comprises a plurality of groups of L-shaped pressing blocks distributed in an annular array, the plurality of groups of L-shaped pressing blocks are driven by a first driving component and perform radial synchronous motion; the contact head is also provided with a limited rotatable sleeve There is an active ring seat, which is driven by a second driving component and performs intermittent rotational motion with occasional stops and starts; a left mounting frame and a right mounting frame are sequentially installed with limited sliding on the left and right sides of the active ring seat, and both the left mounting frame and the right mounting frame are driven by a linkage component and move up and down while the active ring seat performs rotational motion; a hot air box is arranged on the left mounting frame, and the hot air box is driven by a third driving component to slide horizontally, and a hot air gun is arranged on the hot air box; a T-shaped connecting rod is installed with limited sliding on the right mounting frame, and a cleaning brush is fixedly connected to the lower end of the T-shaped connecting rod.

[0006] Preferably, the first driving component includes a rotating disk, a middle part of which is fixedly connected to a central axis, the central axis is fixedly connected to an output shaft of motor No. 1, and the rotating disk is provided with four groups of arc grooves distributed in a circular array, each group of arc grooves is inserted with a cylindrical pin, each cylindrical pin is fixedly connected with a group of L-shaped pressure blocks, and the L-shaped pressure blocks are limitedly slidably installed on the contact head.

[0007] Preferably, a cam groove cooperating with the second driving component is provided on the inner side wall of the active ring seat, and the cam groove is formed by four groups of 90° spiral grooves and four groups of vertical grooves connected in series end to end.

[0008] Preferably, the second driving component includes a driving screw, a sliding seat, a transverse push bar, a transverse clamping column and a main push rod, one end of the main push rod is fixedly connected to a toggle rod inserted in the cam groove, and the other end of the main push rod extends into the axial adjustment seat and is fixedly connected to the radial moving seat.

[0009] Preferably, the radial movable seat is limited and slidably installed in the axial adjustment seat, and a radial drive groove is opened on the radial movable seat, and the radial drive groove is composed of a section of inclined groove and a section of straight groove. One end of the transverse push bar is fixedly connected to the slide seat, and the other end of the transverse push bar extends into the radial movable seat and is fixedly connected with a transverse clamping column, and the transverse clamping column is inserted into the radial drive groove, and the slide seat is sleeved on the driving screw, and the driving screw is limited and rotatably installed in the axial adjustment seat and driven to rotate by the No. 2 motor.

[0010] Preferably, the lower end of the radially movable seat is also connected to a linkage assembly, which includes a driven push bar, a matching ring and a limit column. One end of the driven push bar is fixedly connected to the radially movable seat, and the other end of the driven push bar extends out of the bottom end of the axial adjustment seat and is fixedly connected to the matching ring. Two groups of limit columns are installed on the lower end surface of the matching ring for limiting sliding. One group of limit columns is fixedly connected to the left mounting frame, and the other group of limit columns is fixedly connected to the right mounting frame.

[0011] Preferably, the lower end surface of the matching ring is provided with an annular cavity which is wider at the top and narrower at the bottom, and the limiting column extends into the annular cavity and is fixedly connected with a stop block.

[0012] Preferably, the third driving component includes a transverse screw and a nut seat. The transverse screw is limitedly rotated and mounted on the left mounting frame and fixedly connected to the third motor. The nut seat is sleeved on the transverse screw, and the lower end of the nut seat is fixedly connected to the upper end of the hot air box.

[0013] Preferably, a sliding frame is fixedly connected to the middle part of the upper end of the T-shaped connecting rod, the sliding frame is limitedly slidably installed in the right mounting frame, an eccentric rod is inserted in the sliding frame, the eccentric rod is fixedly connected to an eccentric wheel, the eccentric wheel is rotatably installed on the right mounting frame through a rotating shaft, and the rotating shaft is fixedly connected to the micro motor.

[0014] A welding method for a non-destructive welding device for connecting pins used in chip processing, the welding method comprising the following steps:

[0015] S1: Preheat the pad to make the temperature of the welding area uniform. While preheating, fill the welding area with solder paste. When the temperature of the welding area reaches a suitable level, align the chip and make sure the chip pins are in full contact with the solder paste.

[0016] S2: Then move the contact head to the top of the chip, then turn on the No. 1 motor, and under the cooperation of the rotating disk, the arc groove and the cylindrical pin, the four groups of L-shaped pressing blocks move radially synchronously to clamp and fix the chip to avoid deformation caused by the hot air gun during the welding process;

[0017] S3: Turn on the No. 3 motor, and under the action of the transverse screw and the nut seat, the hot air box moves horizontally, so that the hot air gun heats the solder paste at the lower end of the pin to tin;

[0018] S4: After completing the welding positioning of the pins on one side, the hot air gun stops blowing, and by turning on the No. 2 motor, and under the cooperation of the driving screw, slide seat, transverse clamping column, radial driving groove, radial moving seat, main push rod and toggle rod, it can drive the active ring seat to perform 90° intermittent rotation movement. At this time, the hot air gun and the cleaning brush are first moved up and rotated synchronously. When the active ring seat stops rotating, the hot air gun and the cleaning brush are moved down again, so that the hot air gun heats the solder paste at the pins on the other side again. At the same time, by turning on the micro motor, the T-shaped connecting rod drives the cleaning brush to swing left and right, so as to wipe and clean the remaining tin in the welding area.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention forms a semi-automatic welding assembly by arranging a contact head, an active ring seat, a left mounting frame and a right mounting frame, which can reduce the dependence on manual operation and avoid unnecessary fatigue and injury risks of operators during the welding process; secondly, while ensuring the smooth progress of the welding work, the chip is also limited and fixed to ensure the precise alignment of the pins and the pads during the welding process, avoiding deviations and errors during the welding process, thereby ensuring the welding quality.

[0021] 2. By setting up the cylindrical pin, the rotating disk and the arc groove for use together, the driving force of the No. 1 motor can be converted into the radial synchronous movement of the four groups of L-shaped pressing blocks, which can well clamp or loosen the chip. This setting can prevent the chip from being blown by the hot air gun, avoid deformation during the welding process, and improve the welding accuracy. On the other hand, it can also shield and protect the surface of the chip to a certain extent, thereby extending the service life of the chip.

[0022] 3. The driving screw of the present invention is a reciprocating screw, which can make the slide seat realize reciprocating motion without changing the rotation direction of the second motor, and is used in conjunction with the transverse clamping column, radial driving groove, radial moving seat, main push rod and toggle rod, and can convert the reciprocating motion of the driving screw into 90° intermittent rotation motion of the active ring seat, so that the hot air gun and the cleaning brush can operate synchronously and perform staggered processing on multiple groups of chip pins. Compared with the traditional welding device which usually needs to switch between different devices, the chip pin welding and slag cleaning functions can be realized at the same time, which greatly simplifies the production process and improves the production efficiency.

[0023] 4. By setting the driven push bar, the matching ring and the limit column for use, the longitudinal movement of the radial moving seat can be converted into the synchronous up and down movement of the left mounting frame and the right mounting frame, and the limit column and the matching ring are slidably matched, so that the left mounting frame and the right mounting frame can intermittently rotate with the active ring seat while moving up and down. When the left mounting frame and the right mounting frame move upward, the active ring seat rotates; when the left mounting frame and the right mounting frame move downward, the active ring seat stops. This setting not only ensures the close treatment of the chip pins by the hot air gun and the cleaning brush, but also ensures the normal rotation of the active ring seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional schematic diagram of the structure of the present invention.

[0025] Figure 2 It is a schematic diagram of the axial adjustment seat, the contact head and the circuit board of the present invention.

[0026] Figure 3 It is a schematic diagram of the axial adjustment seat, contact head, chip and chip pins of the present invention.

[0027] Figure 4 It is a schematic diagram of the radial moving seat, the driven push bar, the matching ring and the chip of the present invention.

[0028] Figure 5 It is a schematic diagram of the radial moving seat, the driven push bar, the matching ring, the left mounting frame and the right mounting frame of the present invention.

[0029] Figure 6 It is a schematic diagram of the left mounting frame, the right mounting frame and the active ring seat of the present invention.

[0030] Figure 7 It is a schematic diagram of the main push rod, the toggle rod and the active ring seat of the present invention.

[0031] Figure 8 It is a schematic diagram of the matching ring, the left mounting frame, the hot air box and the hot air gun of the present invention.

[0032] Fig. 9It is a schematic diagram of the right mounting frame, T-shaped connecting rod and cleaning brush of the present invention.

[0033] Fig.10 It is a schematic diagram of the T-shaped connecting rod, the cleaning brush and the sliding frame of the present invention.

[0034] Fig.11 It is a schematic diagram of the L-shaped pressing block, cylindrical pin and rotating disk of the present invention.

[0035] In the figure: 1. assembly frame; 2. longitudinal adjustment seat; 3. axial adjustment seat; 4. contact head; 5. chip; 6. chip pin; 7. circuit board; 8. circuit board mounting table; 9. driving screw; 10. slide seat; 11. horizontal push bar; 12. horizontal clamping column; 13. radial driving groove; 14. radial moving seat; 15. driven push bar; 16. matching ring; 17. limiting column; 18. left mounting frame; 19. horizontal screw; 20. nut seat; 21. hot air box; 22. hot air gun; 23. right mounting frame; 24. T-shaped connecting rod; 25. cleaning brush; 26. sliding frame; 27. eccentric rod; 28. eccentric wheel; 29. ​​main push rod; 30. toggle rod; 31. cam groove; 32. active ring seat; 33. L-shaped pressure block; 34. cylindrical pin; 35. rotating disk; 36. arc groove. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.

[0037] See also Figures 1 to 11The present invention provides a technical solution: a non-destructive welding device for connecting pins of chip 5 processing, comprising an assembly frame 1 and a circuit board mounting platform 8, wherein the assembly frame 1 is slidably mounted with a longitudinal adjustment seat 2 at the upper limit position, and the longitudinal adjustment seat 2 can move up and down on the assembly frame 1, so as to adjust the height of the contact head 4; a circuit board 7 is placed on the circuit board mounting platform 8, and a positioning component for fixing the circuit board 7 is arranged on the circuit board mounting platform 8, and solder paste is smeared on the position of the upper pad of the circuit board 7, and the chip 5 is aligned and placed on the pad, and the chip pins 6 around it are in contact with the solder paste; an axial adjustment seat 3 is rotatably mounted with the upper limit position of the longitudinal adjustment seat 2, which is used for adjusting the angle of the contact head 4; a contact head 4 is fixedly arranged at the bottom of the axial adjustment seat 3, and a chip 5 positioning component is arranged at the lower end of the contact head 4, and the chip 5 positioning component includes multiple The plurality of L-shaped pressing blocks 33 are arranged in a circular array, and the plurality of L-shaped pressing blocks 33 are driven by the first driving component and perform radial synchronous motion; the contact head 4 is also provided with an active ring seat 32 which is limited in rotation and sleeved, and the active ring seat 32 is driven by the second driving component and performs intermittent rotation motion of stopping and starting; the left mounting frame 18 and the right mounting frame 23 are sequentially installed with limited sliding on the left and right sides of the active ring seat 32, and the left mounting frame 18 and the right mounting frame 23 are driven by the linkage component and perform up and down motion while the active ring seat 32 performs rotation motion; the left mounting frame 18 is provided with a hot air box 21, and the hot air box 21 is driven by the third driving component to slide horizontally, and a hot air gun 22 is provided on the hot air box 21; the right mounting frame 23 is provided with a T-shaped connecting rod 24 which is limited in sliding and sleeved, and the lower end of the T-shaped connecting rod 24 is fixedly connected with a cleaning brush 25.

[0038] Furthermore, the present invention forms a semi-automatic welding assembly by providing a contact head 4, an active ring seat 32, a left mounting frame 18 and a right mounting frame 23, which can reduce the dependence on manual operation and eliminate unnecessary fatigue and injury risks of operators during the welding process; secondly, while ensuring the smooth progress of the welding work, the chip 5 is also limited and fixed to ensure the precise alignment of the pins and the pads during the welding process, avoiding deviations and errors during the welding process, thereby ensuring the welding quality.

[0039] like Figure 3 as well as Fig.11 As shown, the first driving component includes a rotating disk 35, the middle of the rotating disk 35 is fixedly connected to the central axis, the central axis is fixedly connected to the output shaft of the No. 1 motor, and the rotating disk 35 is provided with four groups of arc grooves 36 distributed in a circular array, and a cylindrical pin 34 is inserted in each group of arc grooves 36, and each cylindrical pin 34 is fixedly connected to a group of L-shaped pressure blocks 33, and the L-shaped pressure blocks 33 are limitedly slidably installed on the contact head 4.

[0040] Furthermore, by setting up a cylindrical pin 34, a rotating disk 35 and an arc groove 36 for use together, the driving force of the No. 1 motor can be converted into radial synchronous movement of four groups of L-shaped pressure blocks 33, which can well clamp or loosen the chip 5. On the one hand, this arrangement prevents the chip 5 from being blown by the hot air gun 22, avoiding deformation during the welding process and improving the accuracy of welding. On the other hand, it can also shield and protect the surface of the chip 5 to a certain extent, thereby extending the service life of the chip 5.

[0041] like Figure 3-Figure 7 As shown, a cam groove 31 cooperating with the second driving component is provided on the inner side wall of the active ring seat 32, and the cam groove 31 is formed by four groups of 90° spiral grooves and four groups of vertical grooves connected in series. The second driving component includes a driving screw 9, a slide seat 10, a transverse push bar 11, a transverse clamping column 12 and a main push rod 29, one end of the main push rod 29 is fixedly connected to a toggle rod 30 inserted in the cam groove 31, and the other end of the main push rod 29 extends into the axial adjustment seat 3 and is fixedly connected to the radial moving seat 14. The radial movable seat 14 is limitedly slidably installed in the axial adjustment seat 3, and a radial driving groove 13 is opened on the radial movable seat 14. The radial driving groove 13 is composed of a section of inclined groove and a section of straight groove, and the length of the straight groove is much greater than the length of the inclined groove. The advantage of such a setting is that it greatly increases the sliding time of the transverse clamping column 12 in the straight groove, so that the hot air gun 22 and the cleaning brush 25 have enough time to process the pins at their lower ends; one end of the transverse push bar 11 is fixedly connected to the slide seat 10, and the other end of the transverse push bar 11 extends into the radial movable seat 14 and is fixedly connected with the transverse clamping column 12, and the transverse clamping column 12 is inserted in the radial driving groove 13, and the slide seat 10 is sleeved on the driving screw, and the driving screw is limitedly rotatably installed in the axial adjustment seat 3 and driven to rotate by the No. 2 motor.

[0042] Furthermore, the driving screw is a reciprocating screw, which can make the slide 10 realize reciprocating motion without changing the rotation direction of the No. 2 motor, and cooperate with the transverse clamping column 12, the radial driving groove 13, the radial moving seat 14, the main push rod 29 and the toggle rod 30 to convert the reciprocating motion of the driving screw into a 90° intermittent rotation motion of the active ring seat 32, so that the hot air gun 22 and the cleaning brush 25 can run synchronously and perform staggered processing on multiple groups of chip pins 6. Compared with traditional welding devices that usually need to switch between different equipment, the chip pin 6 welding and slag cleaning functions can be realized at the same time, which greatly simplifies the production process and improves production efficiency.

[0043] like Figure 4-Figure 6As shown, the lower end of the radial moving seat 14 is also connected to a linkage assembly, which includes a driven push bar 15, a matching ring 16 and a limit column 17. One end of the driven push bar 15 is fixedly connected to the radial moving seat 14, and the other end of the driven push bar 15 extends out of the bottom end of the axial adjustment seat 3 and is fixedly connected to the matching ring 16. Two groups of limit columns 17 are installed on the lower end surface of the matching ring 16. One group of limit columns 17 is fixedly connected to the left mounting frame 18, and the other group of limit columns 17 is fixedly connected to the right mounting frame 23. The lower end surface of the matching ring 16 is provided with an annular cavity that is wide at the top and narrow at the bottom. The limit column 17 extends into the annular cavity and is fixedly connected to a stop block.

[0044] Furthermore, by setting the driven push bar 15, the matching ring 16 and the limiting column 17 for use in conjunction, the longitudinal movement of the radial moving seat 14 can be converted into the synchronous up and down movement of the left mounting frame 18 and the right mounting frame 23, and the limiting column 17 and the matching ring 16 are slidably matched, so that the left mounting frame 18 and the right mounting frame 23 can intermittently rotate with the active ring seat 32 while moving up and down. When the left mounting frame 18 and the right mounting frame 23 move upward, the active ring seat 32 rotates; when the left mounting frame 18 and the right mounting frame 23 move downward, the active ring seat 32 stops. This arrangement not only ensures the close-range processing of the chip pins 6 by the hot air gun 22 and the cleaning brush 25, but also ensures the normal rotation of the active ring seat 32.

[0045] like Figure 8 As shown, the third driving component includes a transverse screw 19 and a nut seat 20. The transverse screw 19 is mounted on the left mounting frame 18 for limited rotation and is fixedly connected to the No. 3 motor. The nut seat 20 is sleeved on the transverse screw 19, and the lower end of the nut seat 20 is fixedly connected to the upper end of the hot air box 21.

[0046] Specifically, by turning on motor No. 3, it drives the transverse screw 19 to rotate. Under the screwing action of the internal and external threads, the nut seat 20 drives the hot air box 21 and the hot air gun 22 to move horizontally, so that the hot air gun 22 evenly heats the solder at the lower end of the pin.

[0047] like Figure 9-10 As shown, a sliding frame 26 is fixedly connected to the middle part of the upper end of the T-shaped connecting rod 24, and the sliding frame 26 is installed in the right mounting frame 23 for limited sliding. An eccentric rod 27 is inserted in the sliding frame 26, and the eccentric rod 27 is fixedly connected to the eccentric wheel 28. The eccentric wheel 28 is rotatably installed on the right mounting frame 23 through a rotating shaft, and the rotating shaft is fixedly connected to the micro motor.

[0048] Specifically, by turning on the micro motor, the eccentric wheel 28 is driven to rotate, and the eccentric rod 27 on the eccentric wheel 28 acts on the sliding frame 26, so that the T-shaped connecting rod 24 drives the cleaning brush 25 to swing left and right, thereby wiping and cleaning the remaining tin in the welding area.

[0049] When the present invention is used: first preheat the soldering pad to make the temperature of the soldering place uniform. While preheating, fill the soldering area with solder paste. When the temperature of the soldering area reaches a suitable level, align and arrange the chip 5, and make the chip pin 6 fully contact with the solder paste. Then move the contact head 4 to the top of the chip 5, and then turn on the No. 1 motor to drive the rotating disk 35 to rotate. The arc groove 36 on the rotating disk 35 acts on the cylindrical pin 34, so that the four groups of L-shaped pressing blocks 33 move radially synchronously, which can clamp the chip 5 well, avoid the chip 5 being deformed by the hot air gun 22 during the welding process, and improve the accuracy of welding; then, turn on the No. 3 motor to drive the transverse screw 19 to rotate, and under the screwing action of the internal and external threads, the nut seat 20 drives the hot air box 21 and the hot air gun 22 to move horizontally, so that the hot air gun 22 evenly heats the solder at the lower end of the pin; when one motor is completed, After the side pin is welded and positioned, the hot air gun 22 stops blowing air, and by turning on the No. 2 motor, it drives the driving screw 9 to rotate. Since the driving screw is a reciprocating screw, the slide 10 can be reciprocated without changing the rotation direction of the No. 2 motor, and is used in conjunction with the transverse clamping column 12, the radial driving groove 13, the radial moving seat 14, the main push rod 29 and the toggle rod 30, the reciprocating motion of the driving screw can be converted into a 90° intermittent rotation motion of the active ring seat 32. At this time, the hot air gun 22 and the cleaning brush 25 first move up and then move down close to the pin on the other side, so that the hot air gun 22 heats and tins the solder paste at the pin on the other side. At the same time, by turning on the micro motor, it drives the eccentric wheel 28 to rotate, and the eccentric rod 27 on the eccentric wheel 28 acts on the sliding frame 26, so that the T-shaped connecting rod 24 drives the cleaning brush 25 to swing left and right, thereby wiping and cleaning the remaining tin in the welding area.

[0050] A welding method for a non-destructive welding device for connecting pins used in chip 5 processing, the welding method comprising the following steps:

[0051] S1: Preheat the pad to make the temperature of the welding area uniform. While preheating, fill the welding area with solder paste. When the temperature of the welding area reaches a suitable level, align the chip 5 and make the chip pin 6 fully contact with the solder paste;

[0052] S2: Then move the contact head 4 to the top of the chip 5, then turn on the No. 1 motor, and under the cooperation of the rotating disk 35, the arc groove 36 and the cylindrical pin 34, the four groups of L-shaped pressing blocks 33 move radially synchronously to clamp and fix the chip 5 to prevent it from being deformed by the hot air gun 22 during the welding process;

[0053] S3: Turn on the third motor, and under the action of the transverse screw 19 and the nut seat 20, the hot air box 21 moves horizontally, so that the hot air gun 22 heats the solder paste at the lower end of the pin to tin;

[0054] S4: After completing the welding positioning of the pins on one side, the hot air gun 22 stops blowing, and by turning on the No. 2 motor, and under the cooperation of the driving screw 9, the slide 10, the transverse clamping column 12, the radial driving groove 13, the radial moving seat 14, the main push rod 29 and the toggle rod 30, the active ring seat 32 can be driven to perform 90° intermittent rotation movement. At this time, the hot air gun 22 and the cleaning brush 25 are first moved up and rotated synchronously. When the active ring seat 32 stops rotating, the hot air gun 22 and the cleaning brush 25 are then moved down again, so that the hot air gun 22 heats the solder paste at the pins on the other side again to tin. At the same time, by turning on the micro motor, the T-shaped connecting rod 24 drives the cleaning brush 25 to swing left and right, thereby wiping and cleaning the remaining tin in the welding area.

[0055] Furthermore, the method can improve welding efficiency and quality.

[0056] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A non-destructive soldering device for connecting pins used in chip (5) processing, comprising an assembly frame (1), a longitudinal adjustment seat (2) mounted on the assembly frame (1) with limited sliding movement, and a circuit board mounting table (8), characterized in that: The longitudinal adjustment seat (2) is rotatably mounted with an axial adjustment seat (3) at the upper limit position, and a contact head (4) is fixedly mounted at the bottom of the axial adjustment seat (3). A chip (5) positioning component is arranged at the lower end of the contact head (4), and the chip (5) positioning component comprises a plurality of groups of L-shaped pressing blocks (33) distributed in a ring array, and the plurality of groups of L-shaped pressing blocks (33) are driven by a first driving component and perform radial synchronous motion; an active ring seat (32) is also rotatably sleeved on the contact head (4), and the active ring seat (32) is driven by a second driving component and performs intermittent rotational motion of starting and stopping; a left mounting frame (18) and a right mounting frame (23) are sequentially slidably mounted on the left and right sides of the active ring seat (32), and the left mounting frame (18) and the right mounting frame (23) are slidably mounted in a limited position. 8) and the right mounting frame (23) are driven by the linkage assembly and move up and down while rotating with the active ring seat (32); the left mounting frame (18) is provided with a hot air box (21), the hot air box (21) is driven by the third driving component to slide horizontally, and the hot air box (21) is provided with a hot air gun (22); the upper limit sliding installation of the right mounting frame (23) is provided with a T-shaped connecting rod (24), and the lower end of the T-shaped connecting rod (24) is fixedly connected to a cleaning brush (25); the first driving component includes a rotating disk (35), the middle part of the rotating disk (35) is fixedly connected to the central axis, the central axis is fixedly connected to the output shaft of the first motor, and the rotating disk (35) is provided with four groups of circular arrays. The arc grooves (36) are each provided with a cylindrical pin (34), each cylindrical pin (34) is fixedly connected to a group of L-shaped pressing blocks (33), and the L-shaped pressing blocks (33) are limitedly slidably mounted on the contact head (4); a cam groove (31) cooperating with the second driving component is formed on the inner side wall of the active ring seat (32), and the cam groove (31) is composed of four groups of 90° spiral grooves and four groups of vertical grooves connected in series end to end; the second driving component comprises a driving screw (9), a sliding seat (10), a lateral pushing bar (11), a lateral clamping column (12) and a main push rod (29), one end of the main push rod (29) is fixedly connected to a toggle rod (30) inserted in the cam groove (31), and the main push rod (29) is provided with a driving screw (9), a sliding seat (10), a lateral pushing bar (11), a lateral clamping column (12) and a main push rod (29), one end of the main push rod (29) is fixedly connected to a toggle rod (30) inserted in the cam groove (31), and the main push rod (29) is fixedly connected to a toggle rod (30) inserted in the cam groove (31). The other end of the push rod (29) extends into the axial adjustment seat (3) and is fixedly connected to the radial movable seat (14); the radial movable seat (14) is limitedly slidably installed in the axial adjustment seat (3); a radial driving groove (13) is opened on the radial movable seat (14); the radial driving groove (13) is composed of a section of inclined groove and a section of straight groove; one end of the transverse push bar (11) is fixedly connected to the slide seat (10); the other end of the transverse push bar (11) extends into the radial movement seat (14) and is fixedly connected to a transverse clamping column (12); the transverse clamping column (12) is inserted into the radial driving groove (13); the slide seat (10) is sleeved on the driving screw; the driving screw is limitedly rotatably installed in the axial adjustment seat (3) and is driven to rotate by the second motor.

2. A non-destructive soldering device for connecting pins used for chip (5) processing according to claim 1, characterized in that: The lower end of the radial movable seat (14) is also connected to a linkage assembly, which includes a driven push bar (15), a matching ring (16) and a limiting column (17). One end of the driven push bar (15) is fixedly connected to the radial movable seat (14), and the other end of the driven push bar (15) extends out of the bottom end of the axial adjustment seat (3) and is fixedly connected to the matching ring (16). Two groups of limiting columns (17) are installed on the lower end surface of the matching ring (16) in a limiting sliding manner. One group of limiting columns (17) is fixedly connected to the left mounting frame (18), and the other group of limiting columns (17) is fixedly connected to the right mounting frame (23).

3. A non-destructive soldering device for connecting pins used for chip (5) processing according to claim 2, characterized in that: The lower end surface of the matching ring (16) is provided with an annular cavity which is wider at the top and narrower at the bottom, and the limiting column (17) extends into the annular cavity and is fixedly connected to a stop block.

4. A non-destructive soldering device for connecting pins used for chip (5) processing according to claim 3, characterized in that: The third driving component comprises a transverse screw rod (19) and a nut seat (20); the transverse screw rod (19) is mounted on the left mounting frame (18) for limited rotation and is fixedly connected to the third motor; the nut seat (20) is sleeved on the transverse screw rod (19); and the lower end of the nut seat (20) is fixedly connected to the upper end of the hot air box (21).

5. A non-destructive soldering device for connecting pins used for chip (5) processing according to claim 4, characterized in that: A sliding frame (26) is fixedly connected to the middle part of the upper end of the T-shaped connecting rod (24); the sliding frame (26) is slidably mounted in the right mounting frame (23) in a limited position; an eccentric rod (27) is inserted into the sliding frame (26); the eccentric rod (27) is fixedly connected to an eccentric wheel (28); the eccentric wheel (28) is rotatably mounted on the right mounting frame (23) via a rotating shaft; the rotating shaft is fixedly connected to the micro motor.

6. A welding method of the non-destructive welding device for connecting pins used for chip (5) processing as claimed in claim 5, characterized in that: The welding method comprises the following steps: S1: preheating the solder pad to make the temperature of the soldering area uniform. During preheating, fill the soldering area with solder paste. When the temperature of the soldering area reaches a suitable level, align and place the chip (5) and make the chip pins (6) fully contact with the solder paste. S2: Then, the contact head (4) is moved to the top of the chip (5), and then the No. 1 motor is turned on. With the cooperation of the rotating disk (35), the arc groove (36) and the cylindrical pin (34), the four groups of L-shaped pressing blocks (33) are made to move radially synchronously to clamp and fix the chip (5) to prevent it from being deformed by the hot air gun (22) during the welding process; S3: Turn on the third motor, and under the action of the transverse screw (19) and the nut seat (20), the hot air box (21) moves horizontally, so that the hot air gun (22) heats the solder paste at the lower end of the pin to tin; S4: After the soldering positioning of the pins on one side is completed, the hot air gun (22) stops blowing air, and by turning on the No. 2 motor, the active ring seat (32) can be driven to perform 90° intermittent rotational movement under the cooperation of the driving screw (9), the slide seat (10), the transverse clamping column (12), the radial driving groove (13), the radial moving seat (14), the main push rod (29) and the toggle rod (30). At this time, the hot air gun (22) and the cleaning brush (25) are first moved up and rotated synchronously. When the active ring seat (32) stops rotating, the hot air gun (22) and the cleaning brush (25) are moved down again, so that the hot air gun (22) heats and tins the solder paste on the pins on the other side again. At the same time, by turning on the micro motor, the T-shaped connecting rod (24) drives the cleaning brush (25) to swing left and right, thereby wiping and cleaning the remaining tin in the soldering area.

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