SMT component welding inspection device with screening function

Abstract

The SMT component welding inspection device with the screening function comprises a working table, a first conveyor is installed at one end of the top of the working table, a second conveyor is installed at the other end of the top of the working table, and a sinking groove is formed in the top of the working table. The sinking groove is formed between the first conveyor and the second conveyor, the third conveyor is arranged at the top of the sinking groove, the first electric push rod is installed on the inner bottom face of the sinking groove, the third conveyor is installed at the top end of the first electric push rod, and a discharging groove is formed in the front face of the workbench. According to the utility model, the first electric push rod drives the third conveyor to descend, so that the abnormal PCB can stably fall into the storage drawer below, the damage to components caused by mechanical pushing friction in the traditional removal mode is avoided, and the completeness of the components in the removal process of the abnormal PCB is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit board processing, in particular to an SMT component welding inspection device with a screening function. Background Art

[0002] SMT (Surface Mount Technology) is an electronics assembly technology that directly mounts electronic components, such as resistors, capacitors, inductors, diodes, transistors, and integrated circuits, onto the surface of a printed circuit board (PCB) or other substrate. These components are then soldered to the substrate to achieve circuit connections. Compared to traditional plug-in assembly technology, SMT offers advantages such as high assembly density, compact size, light weight, high reliability, strong vibration resistance, low solder joint defect rate, excellent high-frequency characteristics, low production costs, and ease of automated production. While SMT technology enables high-density and high-precision assembly of electronic components, various factors can lead to solder joint defects during actual production, such as poor soldering, cold solder joints, short circuits, and open circuits. If these issues are not promptly identified and addressed, they can seriously impact product quality and reliability. Therefore, after assembling electronic components using SMT technology, solder joint inspection is essential. This not only ensures product quality and reliability, but also optimizes production processes, meets customer needs, and enhances a company's competitiveness.

[0003] Some existing SMT component welding inspection devices use a push plate to push abnormal PCBs off the conveyor belt. When the push plate pushes the PCB, the components on the PCB rub ​​against the conveyor belt, which may cause the components to bend, break, or scratch the surface, thereby affecting the electrical performance and reliability of the components.

[0004] For example, an SMT component welding inspection device disclosed in announcement number CN217542927U is provided with a main COD camera and a sub-COD camera and other structures that cooperate with each other. The pulley transmission structure in the protective shell of the synchronous pulley assembly is driven by a direct drive motor, so that the conveyor roller drives the conveyor belt to transport the workpiece until the PCB board is sent to the bottom of the main COD camera and the sub-COD camera. Multiple groups of main COD cameras and sub-COD cameras capture the solder joint information on the PCB board, and the captured image information is transmitted to an external image processing device, thereby completing the solder joint inspection of the PCB board, and the detection is fast and accurate.

[0005] Although the patented SMT component soldering inspection device incorporates a series of efficient and flexible detection and adjustment mechanisms, the design of using a push plate to push abnormal PCBs off the conveyor belt has certain deficiencies when handling abnormal PCBs. As the push plate pushes the PCBs, friction between the components on the PCBs and the conveyor belt may occur, potentially causing bending, breaking, or surface scratches on the components, thereby affecting their electrical performance and reliability.

[0006] Therefore, it is necessary to invent an SMT component welding inspection device with a screening function to solve the above problems. Utility Model Content

[0007] The purpose of the utility model is to provide an SMT component welding inspection device with a screening function to solve the problems in the above technology.

[0008] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: an SMT component welding inspection device with a screening function, comprising a workbench, a No. 1 conveyor installed at one end of the top of the workbench, a No. 2 conveyor installed at the other end of the top of the workbench, a sinking trough is provided on the top of the workbench, the sinking trough is arranged between the No. 1 conveyor and the No. 2 conveyor, a No. 3 conveyor is provided on the top of the sinking trough, a No. 1 electric push rod is installed on the bottom surface of the sinking trough, the No. 3 conveyor is installed on the top of the No. 1 electric push rod, a discharge trough is provided on the front of the workbench, one end of the discharge trough is connected to the sinking trough, a storage drawer is slidably connected to the inside of the discharge trough, the output end of the No. 3 conveyor is located above the storage drawer, and the inner wall of the storage drawer is provided with a rubber buffer layer.

[0009] The No. 1 and No. 2 conveyors, as well as the intermediate sinking trough and No. 3 conveyor, are cleverly combined to form an efficient screening system. The layout of the sinking trough and No. 3 conveyor allows poor welding or abnormal components found during the inspection process to be quickly isolated and transported to the storage drawer.

[0010] Preferably, a guide mechanism is provided on the top of the workbench, and the guide mechanism includes a forward and reverse tooth bidirectional sliding table module, a support column, a suspension rod and a guide plate, and the number of the support column, the suspension rod and the guide plate is set to two.

[0011] The introduction of the guide mechanism ensures the stability and accuracy of the PCB board during the transportation process. The spacing between the two guide plates is adjusted by the positive and negative bidirectional slide module to accommodate PCB boards of different sizes.

[0012] Preferably, the forward and reverse bidirectional slide module is arranged above the input end of conveyor No. 1, the two support columns are fixedly connected to the top of the workbench, the two support columns are symmetrically distributed about conveyor No. 1, and the forward and reverse bidirectional slide module is installed on the top of the two support columns.

[0013] The forward and reverse bidirectional slide module is installed above the input end of conveyor No. 1 to facilitate precise guidance of the PCB board before it enters the inspection process; the symmetrical distribution of the support columns provides stable support and ensures the stability of the guide mechanism.

[0014] Preferably, the two suspension rods are respectively installed on the bottom of the two slides of the forward and reverse tooth bidirectional slide module, and the two guide plates are respectively installed on the bottom of the two suspension rods.

[0015] The two slides are driven to move to the sides or the middle respectively by the positive and negative tooth bidirectional slide module, which can drive the overhanging rod and the guide plate to move together, thereby changing the distance between the two guide plates.

[0016] Preferably, a gantry bracket is installed on the top of the workbench, a visual detection mechanism is provided below the gantry bracket, and the visual detection mechanism is provided above the output end of the No. 1 conveyor.

[0017] The visual inspection mechanism is installed above the output end of conveyor No. 1. It can photograph and inspect the passing PCB boards in real time and detect welding problems in time.

[0018] Preferably, the visual inspection mechanism includes a loading seat, which is rotatably connected to the center position of the inner top surface of the gantry bracket, a No. 1 motor is installed on the top of the gantry bracket, the output shaft of the No. 1 motor is transmission-connected to the loading seat, a No. 2 electric push rod is installed at the bottom of the loading seat, and a suspension bracket is installed at the bottom of the No. 2 electric push rod.

[0019] Through the cooperation of motor No. 1 and electric push rod No. 2, the height and rotation adjustment of the visual inspection mechanism can be achieved, making it more flexible to adapt to different inspection needs.

[0020] Preferably, a main CCD camera is installed at the center of the top surface of the suspension frame, and auxiliary CCD cameras are rotatably connected on both sides of the inner wall of the suspension frame. No. 2 motors are installed on both sides of the inner wall of the suspension frame, and the output shafts of the two No. 2 motors are respectively connected to the two auxiliary CCD cameras.

[0021] The combination of the main CCD camera and the sub-CCD camera provides multi-angle, all-round shooting capabilities, which can more comprehensively detect the welding quality of PCB boards. The drive of the No. 2 motor enables the sub-CCD camera to flexibly adjust the inclination angle, further increasing the flexibility and accuracy of detection.

[0022] Preferably, fill lights are installed on both sides of the inner top surface of the gantry bracket, a control panel is installed on the surface of the gantry bracket, and the main CCD camera and the two auxiliary CCD cameras are electrically connected to the control panel.

[0023] The addition of fill light provides sufficient lighting to ensure the clarity and accuracy of the captured images. The electrical connection between the control panel and the camera realizes automatic detection and data processing, improving detection efficiency and accuracy.

[0024] In the above technical solution, the technical effects and advantages provided by the utility model are:

[0025] 1. When a PCB with abnormal solder joints is detected, the No. 3 conveyor and No. 1 electric push rod are cleverly used to achieve non-destructive rejection. The No. 1 electric push rod drives the No. 3 conveyor downward, allowing the abnormal PCB to fall smoothly into the storage drawer below. This avoids damage to components caused by mechanical pushing and friction in traditional rejection methods. This design ensures the integrity of components on abnormal PCBs during the rejection process.

[0026] 2. By setting up a guide mechanism and using a bidirectional slide module with positive and negative teeth, the distance between the two guide plates can be easily changed to accommodate PCB boards of different widths. With the precise guidance of the guide plates, the PCB boards can be quickly centered during the conveying process, facilitating subsequent inspection by the visual inspection mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the overall structure of the utility model from a first perspective;

[0028] Figure 2 This is a schematic diagram of the overall structure of the utility model from a second perspective;

[0029] Figure 3 This is a structural sectional view of the utility model;

[0030] Figure 4 This is a structural diagram of the gantry bracket and visual detection mechanism of the utility model;

[0031] Figure 5 It is a structural diagram of the guide mechanism of the utility model.

[0032] Description of reference numerals:

[0033] 1. Workbench; 2. Conveyor No. 1; 3. Conveyor No. 2; 4. Sinking chute; 5. Conveyor No. 3; 6. Electric push rod No. 1; 7. Storage drawer; 8. Guide mechanism; 9. Bidirectional slide module with positive and negative teeth; 10. Support column; 11. Suspension rod; 12. Guide plate; 13. Gantry bracket; 14. Visual inspection mechanism; 15. Loading seat; 16. Motor No. 1; 17. Electric push rod No. 2; 18. Suspension bracket; 19. Main CCD camera; 20. Sub-CCD camera; 21. Motor No. 2; 22. Fill light; 23. Control panel. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0035] The utility model provides Figure 1-5 The shown device is an SMT component welding inspection device with a screening function, comprising a workbench 1, a No. 1 conveyor 2 installed at one end of the top of the workbench 1, a No. 2 conveyor 3 installed at the other end of the top of the workbench 1, a sinking trough 4 is provided on the top of the workbench 1, the sinking trough 4 is arranged between the No. 1 conveyor 2 and the No. 2 conveyor 3, a No. 3 conveyor 5 is provided on the top of the sinking trough 4, a No. 1 electric push rod 6 is installed on the bottom surface of the sinking trough 4, and the No. 3 conveyor 5 is installed on the top of the No. 1 electric push rod 6. A discharge trough is provided on the front of the workbench 1, one end of the discharge trough is connected to the sinking trough 4, and a storage drawer 7 is slidably connected to the inside of the discharge trough, and the output end of the No. 3 conveyor 5 is located above the storage drawer 7, and the inner wall of the storage drawer 7 is provided with a rubber buffer layer.

[0036] In one aspect of the present embodiment, a guide mechanism 8 is provided on the top of the workbench 1, and the guide mechanism 8 includes a positive and negative tooth bidirectional slide module 9, a support column 10, a suspension rod 11 and a guide plate 12. The number of the support column 10, the suspension rod 11 and the guide plate 12 is set to two. The positive and negative tooth bidirectional slide module 9 is arranged above the input end of the No. 1 conveyor 2. The two support columns 10 are fixedly connected to the top of the workbench 1. The two support columns 10 are symmetrically distributed about the No. 1 conveyor 2. The positive and negative tooth bidirectional slide module 9 is installed on the top of the two support columns 10. The two suspension rods 11 are respectively installed on the two slide bottoms of the positive and negative tooth bidirectional slide module 9. The two guide plates 12 are respectively installed on the bottoms of the two suspension rods 11. A gantry bracket 13 is installed on the top of the workbench 1. A visual detection mechanism 14 is provided below the gantry bracket 13. The visual detection mechanism 14 is provided above the output end of the No. 1 conveyor 2. The visual inspection mechanism 14 includes a loading seat 15, which is rotatably connected to the center position of the inner top surface of the gantry bracket 13. A No. 1 motor 16 is installed on the top of the gantry bracket 13, and the output shaft of the No. 1 motor 16 is transmission-connected to the loading seat 15. A No. 2 electric push rod 17 is installed at the bottom of the loading seat 15, and a suspension bracket 18 is installed at the bottom of the No. 2 electric push rod 17. A main CCD camera 19 is installed at the center position of the inner top surface of the suspension bracket 18. Auxiliary CCD cameras 20 are rotatably connected on both sides of the inner wall of the suspension bracket 18. A No. 2 motor 21 is installed on both sides of the inner wall of the suspension bracket 18, and the output shafts of the two No. 2 motors 21 are transmission-connected to the two auxiliary CCD cameras 20 respectively. Fill lights 22 are installed on both sides of the inner top surface of the gantry bracket 13, and a control panel 23 is installed on the surface of the gantry bracket 13. The main CCD camera 19 and the two auxiliary CCD cameras 20 are electrically connected to the control panel 23.

[0037] Working principle of this utility model:

[0038] Refer to the instruction manual Figure 1-5When using the present invention, first adjust the guide mechanism 8 and the visual inspection mechanism 14 according to the size of the PCB board to be tested, and drive the two slides to the sides or the middle respectively through the positive and negative tooth bidirectional slide module 9 until the spacing between the two guide plates 12 matches the width of the PCB board to be tested. Under the guidance of the two guide plates 12, the PCB board can be quickly centered and transported forward along the No. 1 conveyor 2. The No. 2 electric push rod 17 is used to lift and lower the suspension frame 18, so that the suspension frame 18 and the main CCD camera 19 and two sub-CCD cameras 20 thereon are moved to an appropriate height, and the No. 2 motor 21 is used to drive the sub-CCD cameras 20 to adjust the inclination so that The surface of the PCB board can be clearly photographed. When the PCB board passes through the visual inspection mechanism 14 below the gantry bracket 13, the main CCD camera 19 and the two sub-CCD cameras 20 are started simultaneously to photograph the appearance of the PCB board. If necessary, the loading base 15 can be driven to rotate by the No. 1 motor 16, thereby driving the entire visual inspection mechanism 14 to rotate. In this way, the two sub-CCD cameras 20 can photograph the PCB board from different angles to obtain more comprehensive image information. The captured images are uniformly transmitted to the control panel 23 for analysis and comparison. The image processing software in the control panel 23 will process the images and identify PCB boards with abnormal solder joints;

[0039] When an abnormal PCB board is detected, the PCB board continues to move forward along the No. 1 conveyor 2 to the No. 3 conveyor 5. At this time, the No. 1 electric push rod 6 drives the No. 3 conveyor 5 to descend, and then the No. 3 conveyor 5 continues to operate, so that the abnormal PCB board can smoothly fall into the storage drawer 7 below. The rubber buffer layer on the inner wall of the storage drawer 7 can reduce the collision of the PCB board during the falling process, protecting the components from damage. The abnormal PCB boards in the storage drawer 7 are regularly taken out for rework and repair;

[0040] If the PCB board passes the inspection, the No. 3 conveyor 5 maintains its original height, and the No. 1 conveyor 2 conveys the normal PCB board to the No. 3 conveyor 5. Then the No. 3 conveyor 5 moves the PCB board to the No. 2 conveyor 3, and the No. 2 conveyor 3 sends the normal PCB board to the subsequent processing line for the next step of processing.

Claims

1. A SMT component welding inspection device with a screening function, comprising a workbench (1), characterized in that: A No. 1 conveyor (2) is installed at one end of the top of the workbench (1), and a No. 2 conveyor (3) is installed at the other end of the top of the workbench (1). A sinking trough (4) is provided on the top of the workbench (1), and the sinking trough (4) is arranged between the No. 1 conveyor (2) and the No. 2 conveyor (3). A No. 3 conveyor (5) is provided on the top of the sinking trough (4). A No. 1 electric push rod (6) is installed on the bottom surface of the sinking trough (4), and the No. 3 conveyor (5) is installed on the top of the No. 1 electric push rod (6). A discharge trough is provided on the front of the workbench (1), and one end of the discharge trough is connected to the sinking trough (4). A storage drawer (7) is slidably connected inside the discharge trough. The output end of the No. 3 conveyor (5) is located above the storage drawer (7), and the inner wall of the storage drawer (7) is provided with a rubber buffer layer.

2. The SMT component welding inspection device with screening function according to claim 1, characterized in that: A guide mechanism (8) is provided on the top of the workbench (1), and the guide mechanism (8) comprises a forward and reverse tooth bidirectional sliding platform module (9), a support column (10), a suspension rod (11) and a guide plate (12), and the number of the support column (10), the suspension rod (11) and the guide plate (12) is set to two.

3. The SMT component welding inspection device with screening function according to claim 2, characterized in that: The forward and reverse tooth bidirectional slide module (9) is arranged above the input end of the No. 1 conveyor (2), and the two support columns (10) are fixedly connected to the top of the workbench (1). The two support columns (10) are symmetrically distributed with respect to the No. 1 conveyor (2), and the forward and reverse tooth bidirectional slide module (9) is installed on the top of the two support columns (10).

4. The SMT component welding inspection device with screening function according to claim 2, characterized in that: The two suspension rods (11) are respectively installed on the bottoms of the two slides of the forward and reverse tooth bidirectional slide module (9), and the two guide plates (12) are respectively installed on the bottoms of the two suspension rods (11).

5. The SMT component welding inspection device with screening function according to claim 1, characterized in that: A gantry bracket (13) is installed on the top of the workbench (1), a visual inspection mechanism (14) is provided below the gantry bracket (13), and the visual inspection mechanism (14) is provided above the output end of the No. 1 conveyor (2).

6. The SMT component welding inspection device with screening function according to claim 5, characterized in that: The visual inspection mechanism (14) includes a loading seat (15), the loading seat (15) is rotatably connected to the center position of the inner top surface of the gantry bracket (13), a No. 1 motor (16) is installed on the top of the gantry bracket (13), the output shaft of the No. 1 motor (16) is transmission-connected to the loading seat (15), a No. 2 electric push rod (17) is installed at the bottom of the loading seat (15), and a suspension bracket (18) is installed at the bottom of the No. 2 electric push rod (17).

7. The SMT component welding inspection device with screening function according to claim 6, characterized in that: A main CCD camera (19) is installed at the center position of the top surface of the suspension frame (18), and auxiliary CCD cameras (20) are rotatably connected on both sides of the inner wall of the suspension frame (18). A second motor (21) is installed on both sides of the inner wall of the suspension frame (18), and the output shafts of the two second motors (21) are respectively connected to the two auxiliary CCD cameras (20).

8. The SMT component welding inspection device with screening function according to claim 7, characterized in that: Filling lights (22) are installed on both sides of the inner top surface of the gantry bracket (13), a control panel (23) is installed on the surface of the gantry bracket (13), and the main CCD camera (19) and the two auxiliary CCD cameras (20) are electrically connected to the control panel (23).

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