A visual inspection device for solder joint quality of board card wave soldering

Abstract

The utility model discloses a kind of welding spot quality visual inspection devices for board cap peak welding, it is related to circuit board detection technical field, including detection table, the top of detection table is fixedly installed with clamping assembly, the top of detection table is fixedly installed with top seat through four support columns, the bottom of top seat is transversely provided with two grooves, the sliding base of L type is slidably installed in two grooves place through multiple T type sliding blocks, one through movable slot is transversely provided in the inside of top seat between two grooves;Transverse drive mechanism, transverse drive mechanism includes ball screw and drive motor, ball screw is rotatably installed on the top of top seat by two bearing seats, transmission block is screw-connected on the outside of ball screw.The utility model can realize the longitudinal and lateral automatic adjustment of detection mechanism, to facilitate the detection processing of the different positions of board card, and without manual manual excessive intervention adjustment, effectively improve the detection work efficiency, and practicality is higher.

Description

Technical Field

[0001] This utility model relates to the field of circuit board testing technology, and in particular to a visual inspection device for solder joint quality of wave soldering circuit boards. Background Technology

[0002] A circuit board is a printed circuit board (PCB) that typically has pins or interfaces. It is inserted into a slot on a computer motherboard to expand the computer's functionality or enable communication with external devices. Circuit boards integrate electronic components and circuits to perform specific functions. In short, a circuit board is an intermediate module that connects a computer to external devices or expands hardware functionality. By installing drivers, it accomplishes specific tasks.

[0003] Wave soldering is an automated soldering process used in the mass production of electronic products. It is mainly used for soldering plug-in electronic components to printed circuit boards (PCBs). The quality inspection of wave solder joints on circuit boards usually combines multiple methods, including visual inspection, electrical testing, mechanical strength testing, and advanced non-destructive testing. Among them, visual inspection mainly checks the quality of the wave solder joints on the circuit boards, including observing whether the solder joints are bright and smooth, and free from defects such as cold solder joints, false solder joints, bridging, solder spikes, insufficient solder, and half-soldering. In the past, most of the inspection methods were done manually using tools such as magnifying glasses for visual inspection. However, with the development of the times and technology, most visual inspection work is now done through visual inspection devices, as shown below.

[0004] A search revealed a patent with publication number CN223538799U, which discloses a circuit board solder joint quality inspection device, relating to the field of circuit board technology. The device includes a base plate, with a first support plate and a second support plate fixedly connected to its top. A turntable is rotatably connected to one side of the outer wall of the first support plate, and a handle is fixedly connected to one side of the outer wall of the turntable. A micro-spring is provided inside the first support plate, and a top rod is slidably connected inside each of the first support plates. A rotating shaft is rotatably connected to the outer wall of the second support plate. Through the arrangement of the first support plate, second support plate, circular groove, connecting rod, turntable, micro-spring, handle, top rod, and rotating shaft, a first electric push rod and a rubber pad can be rotated. During use, the circuit board can be clamped between the two, so the circuit board can be rotated under force, allowing it to be flipped, avoiding the need for frequent re-clamping and flipping operations.

[0005] However, the aforementioned solder joint quality inspection equipment still has the following areas for improvement. For example, while it can adjust the horizontal position of the image processing unit during circuit board inspection, it cannot adjust the vertical position of the image processing unit. This makes it difficult to sequentially inspect different locations on the circuit board, and the position adjustment of the image processing unit requires manual adjustment, which is time-consuming, labor-intensive, inefficient, and results in high workload for staff. The automation level is insufficient, making it difficult to meet the needs of large-scale inspection work. Therefore, there is an urgent need for a visual inspection device for solder joint quality of wave soldering circuit boards to solve the above technical problems. Utility Model Content

[0006] This utility model discloses a visual inspection device for solder joint quality in wave soldering of circuit boards. It includes a lateral drive mechanism and a visual inspection mechanism. During operation, the drive motor rotates the ball screw, which in turn drives the slide block to move laterally along the slide groove via a transmission block, thus adjusting the lateral position of the image processing unit. Simultaneously, the first electric cylinder drives the mounting plate to move the image processing unit longitudinally, achieving automated lateral and longitudinal position adjustment without manual operation. This effectively improves adjustment efficiency, reduces the labor intensity of workers, meets the needs of large-scale inspection, and allows for precise sequential inspection of solder joints at different locations on the circuit board. In summary, this device solves the problems in the prior art.

[0007] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0008] This utility model discloses a visual inspection device for solder joint quality of wave soldering of circuit boards, including an inspection table. A clamping assembly is fixedly installed on the top of the inspection table. A top seat is fixedly installed on the top of the inspection table through four support columns. Two sliding grooves are opened laterally at the bottom of the top seat. An L-shaped slide block is slidably installed at the two sliding grooves through multiple T-shaped sliders. A through movable groove is opened laterally between the two sliding grooves inside the top seat.

[0009] A transverse drive mechanism includes a ball screw and a drive motor. The ball screw is rotatably mounted on the top of the top seat via two bearing seats. A transmission block is screwed onto the outside of the ball screw. The bottom of the transmission block passes through a movable groove and is fixedly connected to the top of the slide. The drive motor is fixedly mounted on the top of the top seat via a motor seat. The output end of the drive motor is connected to the shaft end of the ball screw.

[0010] A visual inspection mechanism includes a first electric cylinder, which is fixedly installed in a through manner at the L-shaped turning surface of the slide. The output end of the first electric cylinder is fixedly connected to an L-shaped mounting plate, and an image processing unit is fixedly installed at the top of the inner part of the mounting plate.

[0011] Furthermore, a protective cover is detachably mounted on the top of the top seat by a plurality of screws, and the protective cover is located outside the ball screw and the drive motor.

[0012] Furthermore, multiple heat dissipation holes are provided on both the front and rear sides of the protective cover, and both sets of heat dissipation holes are close to the drive motor. Inner grooves are provided on both the left and right sides of the protective cover.

[0013] Furthermore, two first guide rods are symmetrically fixedly connected to one side of the back of the mounting plate. The first guide rods movably pass through the L-shaped turning surface of the slide and are in clearance fit with the slide.

[0014] Furthermore, two LED tubes are symmetrically fixedly installed at the bottom of the slide, with the two LED tubes located on both sides of the image processing unit.

[0015] Furthermore, the clamping assembly includes two fixed seats, which are symmetrically fixedly installed on the top of the testing table, and the two fixed seats are respectively close to the two sides of the testing table. A second electric cylinder is fixedly installed through the fixed seat. An adjusting seat is fixedly connected to the output end of the second electric cylinder. A bottom support plate is fixedly connected to the bottom of the two adjusting seats on opposite sides. A top plate is fixedly connected to the top of the two adjusting seats on opposite sides. A third electric cylinder is fixedly installed through the top plate. A pressure plate is fixedly connected to the output end of the third electric cylinder. A rubber pad layer is glued and fixed to the opposite sides of the bottom support plate and the pressure plate.

[0016] Furthermore, two second guide rods are fixedly connected to one side of the adjusting seat. The second guide rods movably pass through the fixed seat and are in clearance fit with the fixed seat. Two third guide rods are fixedly connected to the top of the pressing plate. The top ends of the third guide rods movably pass through the top plate and are in clearance fit with the top plate.

[0017] The present invention has the following advantages over the prior art:

[0018] 1. This technical solution incorporates a transverse drive mechanism and a vision inspection mechanism. During operation, the drive motor rotates the ball screw, which in turn drives the slide block to move laterally along the slide groove via the transmission block, thereby adjusting the lateral position of the image processing unit. Simultaneously, the first electric cylinder drives the mounting plate to move the image processing unit longitudinally, achieving automated lateral and longitudinal position adjustment without manual operation. This effectively improves adjustment efficiency, reduces the labor intensity of workers, meets the needs of large-volume inspection, and can accurately inspect solder joints at different locations on the circuit board sequentially, making it highly practical.

[0019] 2. This technical solution incorporates a clamping assembly. During operation, the second electric cylinder drives the adjusting seat to move the base plate laterally, adapting to the support requirements of boards of different widths. The third electric cylinder drives the pressure plate downward, working in conjunction with the base plate to clamp and fix the boards vertically. The rubber pads on the base plate and pressure plate prevent damage to the boards during clamping. Furthermore, the second and third guide rods enhance the stability of the adjusting seat and pressure plate movement, ensuring that the boards are firmly clamped and stably positioned. Compared to left-right clamping, vertical clamping provides better stability, preventing the boards from falling off and ensuring the accuracy of subsequent testing, thus further improving its practicality. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of this utility model from another perspective;

[0023] Figure 3 This is a schematic diagram of the exploded structure of the slide mount of this utility model;

[0024] Figure 4 An exploded view of the mounting plate of this utility model.

[0025] Figure 5 This is a schematic diagram of the clamping plate installation structure of this utility model.

[0026] In the diagram: 1. Testing platform; 2. Top seat; 3. Slide groove; 4. T-shaped slider; 5. Slide seat; 6. Movable groove; 7. Ball screw; 8. Drive motor; 9. Bearing seat; 10. Transmission block; 11. First electric cylinder; 12. Mounting plate; 13. Image processing unit; 14. Protective cover; 15. Heat dissipation hole; 16. Inner groove; 17. First guide rod; 18. LED tube; 19. Fixed seat; 20. Second electric cylinder; 21. Adjusting seat; 22. Bottom support plate; 23. Top plate; 24. Third electric cylinder; 25. Pressing plate; 26. Rubber pad; 27. Second guide rod; 28. Third guide rod. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0028] In the description of this utility model, it should be understood that the terms "surface", "side", "gap", "peripheral", etc., which indicate orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0029] Reference Figures 1-5 A visual inspection device for solder joint quality of wave soldering of circuit boards includes an inspection table 1. A clamping assembly is fixedly installed on the top of the inspection table 1. A top seat 2 is fixedly installed on the top of the inspection table 1 by four support columns. Two sliding grooves 3 are opened laterally on the bottom of the top seat 2. An L-shaped slide seat 5 is slidably installed at the two sliding grooves 3 by multiple T-shaped sliders 4. A through movable groove 6 is opened laterally between the two sliding grooves 3 inside the top seat 2.

[0030] The transverse drive mechanism includes a ball screw 7 and a drive motor 8. The ball screw 7 is rotatably mounted on the top of the top seat 2 via two bearing seats 9. A transmission block 10 is screwed to the outside of the ball screw 7. The bottom of the transmission block 10 passes through the movable groove 6 and is fixedly connected to the top of the slide 5. The drive motor 8 is fixedly mounted on the top of the top seat 2 via a motor seat. The output end of the drive motor 8 is connected to the shaft end of the ball screw 7. The visual inspection mechanism includes a first electric cylinder 11. The first electric cylinder 11 is fixedly mounted in a through-type manner at the L-shaped turning surface of the slide 5. An L-shaped mounting plate 12 is fixedly connected to the output end of the first electric cylinder 11. An image processing unit 13 is fixedly mounted on the top of the inner part of the mounting plate 12.

[0031] A protective cover 14 is detachably mounted on the top of the top seat 2 by multiple screws. The protective cover 14 is located outside the ball screw 7 and the drive motor 8. Multiple heat dissipation holes 15 are provided on both the front and rear sides of the protective cover 14. Both sets of heat dissipation holes 15 are close to the drive motor 8. Inner grooves 16 are provided on both the left and right sides of the protective cover 14. Two first guide rods 17 are symmetrically fixedly connected to one side of the back of the mounting plate 12. The first guide rods 17 movably pass through the L-shaped turning surface of the slide 5 and are clearance-fitted with the slide 5. Two LED tubes 18 are symmetrically fixedly mounted on the bottom of the slide 5. The two LED tubes 18 are located on both sides of the image processing unit 13.

[0032] The clamping assembly includes two fixed seats 19, which are symmetrically fixedly installed on the top of the testing table 1 and are respectively close to the two sides of the testing table 1. A second electric cylinder 20 is fixedly installed through the fixed seat 19. An adjusting seat 21 is fixedly connected to the output end of the second electric cylinder 20. A bottom support plate 22 is fixedly connected to the bottom of the two adjusting seats 21 on opposite sides. A top plate 23 is fixedly connected to the top of the two adjusting seats 21 on opposite sides. A third electric cylinder 24 is fixedly installed through the top plate 23. A pressure plate 25 is fixedly connected to the output end of the third electric cylinder 24. A rubber pad layer 26 is glued and fixed to the opposite sides of the bottom support plate 22 and the pressure plate 25.

[0033] Two second guide rods 27 are fixedly connected to one side of the adjusting seat 21. The second guide rods 27 movably pass through the fixed seat 19 and are clearance-fitted with the fixed seat 19. Two third guide rods 28 are fixedly connected to the top of the pressing plate 25. The top of the third guide rods 28 movably passes through the top plate 23 and is clearance-fitted with the top plate 23.

[0034] It should be noted that the drive motor 8, the first electric cylinder 11, the second electric cylinder 20 and the third electric cylinder 24 are all externally connected to a PLC controller; the image processing unit 13 is composed of a CMOS image sensor and a camera. The combination of the two can capture and analyze images, identify weld defects, and the image processing unit 13 is externally connected to a display control terminal.

[0035] In the specific implementation process, the second electric cylinder 20 is first activated by the PLC controller. The second electric cylinder 20 drives the adjusting seat 21 to move the base plate 22 laterally until the distance between the two base plates 22 is adapted to the size of the circuit board to be tested. Then, the circuit board to be tested is placed on the two base plates 22 to achieve initial support for the circuit board. Next, the third electric cylinder 24 is activated, which drives the clamping plate 25 to move downward until the clamping plate 25 is in contact with the top of the circuit board. Together with the base plate 22, the circuit board is clamped and fixed from top to bottom. At this time, the rubber pad 26 is in contact with the surface of the circuit board to avoid damage to the circuit board due to excessive clamping force. After the circuit board is fixed, the LED lamp 18 is turned on to provide sufficient and uniform illumination to the testing area and reduce the impact of insufficient light on the testing. The impact of accuracy; then, the PLC controller starts the drive motor 8 and the first electric cylinder 11. The drive motor 8 drives the ball screw 7 to rotate. The ball screw 7 drives the slide block 5 to move laterally along the slide groove 3 through the transmission block 10. At the same time, the first electric cylinder 11 drives the mounting plate 12 to move the image processing unit 13 longitudinally, so that the image processing unit 13 can perform a full scan of the solder joints on the surface of the board according to the preset path. The CMOS image sensor and camera capture the solder joint images and transmit them to the display control terminal. The image processing analysis identifies whether there are defects in the solder joints. If a defect is found during the detection process, the display control terminal will promptly prompt and mark the defect location. After the detection is completed, the third electric cylinder 24 and the second electric cylinder 20 are started in reverse order, and the board can be released and taken out.

[0036] Among them, the protective cover 14 is installed outside the ball screw 7 and the drive motor 8, which can effectively block external dust and impurities from adhering to the surface of the transmission components, avoid affecting the transmission accuracy, and at the same time prevent workers from accidentally touching the moving parts, thus improving the safety of equipment operation.

[0037] Among them, the heat dissipation holes 15 on the front and rear sides of the protective cover 14 are located close to the drive motor 8, which can quickly dissipate the heat generated by the drive motor 8 during operation and prevent the motor from being affected by overheating. The inner grooves 16 on the left and right sides make it easy for staff to hold and disassemble the protective cover 14, providing convenience for subsequent maintenance.

[0038] Among them, the two first guide rods 17 on the back of the mounting plate 12 move synchronously with the mounting plate 12. Through the gap cooperation with the slide block 5, they guide the movement direction of the mounting plate 12, prevent the mounting plate 12 from shifting when the first electric cylinder 11 is driven, ensure the movement accuracy of the image processing unit 13, and improve the accuracy of the detection position.

[0039] Among them, the two LED tubes 18 at the bottom of the slide 5 are located on both sides of the image processing unit 13, which can provide supplementary lighting to the solder joint detection area from both sides, eliminate the shadow on the surface of the solder joint, make the solder joint image clearer, and provide a good image basis for the image processing unit 13 to accurately identify defects.

[0040] The second guide rod 27 on one side of the adjusting seat 21 moves synchronously with the adjusting seat 21 to guide the lateral movement of the adjusting seat 21, preventing the adjusting seat 21 from tilting when driven by the second electric cylinder 20, and ensuring that the bottom support plate 22 moves smoothly to accurately support the plate; the third guide rod 28 on the top of the clamping plate 25 moves synchronously with the clamping plate 25 to guide the longitudinal movement of the clamping plate 25, preventing the clamping plate 25 from shifting when driven by the third electric cylinder 24, which would cause the clamping to be unstable, and further improving the stability of the plate clamping.

[0041] The image processing unit 13 is fixed to the inner top of the mounting plate 12 by screws. The screws are screwed into the preset threaded holes of the mounting plate 12 to ensure that the detection direction of the image processing unit 13 is perpendicular to the surface of the detection stage 1.

[0042] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A visual inspection device for solder joint quality in wave soldering of circuit boards, characterized in that, The test platform (1) is provided with a clamping assembly fixedly installed on its top. A top seat (2) is fixedly installed on the top of the test platform (1) by four support columns. Two sliding grooves (3) are opened laterally at the bottom of the top seat (2). An L-shaped slide seat (5) is slidably installed at the two sliding grooves (3) by multiple T-shaped sliders (4). A through movable groove (6) is opened laterally between the two sliding grooves (3) inside the top seat (2). The transverse drive mechanism includes a ball screw (7) and a drive motor (8). The ball screw (7) is rotatably mounted on the top of the top seat (2) via two bearing seats (9). A transmission block (10) is screwed to the outside of the ball screw (7). The bottom of the transmission block (10) passes through the movable groove (6) and is fixedly connected to the top of the slide (5). The drive motor (8) is fixedly mounted on the top of the top seat (2) via a motor seat. The output end of the drive motor (8) is connected to the shaft end of the ball screw (7). The visual inspection mechanism includes a first electric cylinder (11), which is fixedly installed in a through manner at the L-shaped turning surface of the slide (5). The output end of the first electric cylinder (11) is fixedly connected to an L-shaped mounting plate (12), and an image processing unit (13) is fixedly installed at the top inside the mounting plate (12).

2. The visual inspection device for solder joint quality of wave soldering circuit boards according to claim 1, characterized in that, The top of the top seat (2) is detachably mounted with a protective cover (14) by a plurality of screws. The protective cover (14) is located outside the ball screw (7) and the drive motor (8).

3. The visual inspection device for solder joint quality of wave soldering circuit boards according to claim 2, characterized in that, The protective cover (14) has multiple heat dissipation holes (15) on both the front and rear sides. Both sets of heat dissipation holes (15) are close to the drive motor (8). The protective cover (14) has internal grooves (16) on both the left and right sides.

4. The visual inspection device for solder joint quality of wave soldering circuit boards according to claim 1, characterized in that, Two first guide rods (17) are symmetrically fixedly connected to one side of the back of the mounting plate (12). The first guide rods (17) movably pass through the L-shaped turning surface of the slide (5) and are in clearance fit with the slide (5).

5. The visual inspection device for solder joint quality of wave soldering circuit boards according to claim 2, characterized in that, Two LED tubes (18) are symmetrically fixedly installed at the bottom of the slide (5), and the two LED tubes (18) are located on both sides of the image processing unit (13).

6. The visual inspection device for solder joint quality of wave soldering circuit boards according to claim 1, characterized in that, The clamping assembly includes two fixed seats (19), which are symmetrically fixedly installed on the top of the testing table (1) and are respectively close to the two sides of the testing table (1). A second electric cylinder (20) is fixedly installed through the fixed seat (19). An adjustment seat (21) is fixedly connected to the output end of the second electric cylinder (20). A bottom plate (22) is fixedly connected to the bottom of the two adjustment seats (21) on opposite sides. A top plate (23) is fixedly connected to the top of the two adjustment seats (21) on opposite sides. A third electric cylinder (24) is fixedly installed through the top plate (23). A pressure plate (25) is fixedly connected to the output end of the third electric cylinder (24). A rubber pad (26) is glued and fixed to the opposite side of the bottom plate (22) and the pressure plate (25).

7. The visual inspection device for solder joint quality of wave soldering circuit boards according to claim 6, characterized in that, Two second guide rods (27) are fixedly connected to one side of the adjusting seat (21). The second guide rods (27) move through the fixed seat (19) and are in clearance fit with the fixed seat (19). Two third guide rods (28) are fixedly connected to the top of the pressing plate (25). The top of the third guide rods (28) moves through the top plate (23) and is in clearance fit with the top plate (23).

Images