A circuit board inspection apparatus

Abstract

The utility model discloses a kind of circuit board detection devices, belong to circuit board technical field, including workbench, workbench is rotationally provided with conveyor belt, two groups of ortho adjustment units are arranged in the both sides of conveyor belt, and the tail end of the conveyance of two groups of ortho adjustment units is respectively provided with optical detection unit and electrical detection unit, the appearance and electrical performance of circuit board can be detected respectively, ortho adjustment unit and electrical detection unit all include reciprocating screw rod, and the outer wall of reciprocating screw rod is movably provided with ortho plate and fixed frame respectively, and electrical detection unit all includes telescopic push rod, and the side of push rod facing circuit board is fixedly provided with object sensor, optical detection unit includes optical camera, can be photographed on the circuit board of conveyor belt, and electrical detection unit includes test template matched with circuit board.

Description

Technical Field

[0001] This utility model relates to the field of circuit board technology, specifically to a circuit board testing device. Background Technology

[0002] Circuit boards are named as follows: ceramic circuit board, alumina ceramic circuit board, aluminum nitride ceramic circuit board, circuit board, PCB board, aluminum substrate, high frequency board, thick copper board, impedance board, PCB, ultra-thin circuit board, ultra-thin circuit board, printed circuit board (copper etching technology), etc. PCB circuit boards are closely connected and mutually supportive with various electronic products. Because different electronic products have different requirements for the size and specifications of circuit boards, the size and specifications of PCB circuit boards are not always consistent.

[0003] During the circuit board manufacturing process, PCB inspection is necessary. High-resolution cameras can scan the PCB and compare it with design documents or standard images to identify solder joint defects (cold solder joints, bridging), component misalignment, incorrect polarity, scratches, etc., thus inspecting the PCB's appearance. Probes can be used to contact test points to measure parameters such as resistance, capacitance, and voltage, verifying circuit connectivity and whether component values ​​meet design specifications, thereby testing the PCB's electrical performance.

[0004] Traditional testing devices can only fix circuit boards of one width and size, and only one type of testing board is installed on the testing device, which limits its use. In addition, most devices require manual fixing or disassembly of circuit boards, which is not efficient and results in low production efficiency. Utility Model Content

[0005] To address the limitations of traditional testing devices, which can only fix circuit boards of one width and size, and only install one type of testing board, resulting in certain restrictions on use, and the fact that most devices require manual fixing or disassembly of the circuit boards, leading to inefficient operation and low production efficiency, this utility model provides a circuit board testing device.

[0006] A circuit board inspection device includes a worktable with a conveyor belt rotatably mounted on it. Two sets of alignment adjustment units are arranged on both sides of the conveyor belt. Optical inspection unit and electrical inspection unit are respectively arranged at the conveyor tail ends of the two sets of alignment adjustment units, which can inspect the appearance and electrical performance of the circuit board respectively. Both the alignment adjustment unit and the electrical inspection unit include a reciprocating lead screw, and an alignment plate and a fixing frame are movably arranged on the outer wall of the reciprocating lead screw. Both the optical inspection unit and the electrical inspection unit include a telescopic push rod, and an object sensor is fixedly arranged on the side of the push rod facing the circuit board. The optical inspection unit includes an optical camera to capture images of the circuit board on the conveyor belt. The electrical inspection unit includes a test template that matches the circuit board.

[0007] Furthermore, the outer wall of the workbench is fixedly equipped with several support plates and drive motors, and conveyor rollers are rotatably installed at both ends of the workbench. The outer wall of the conveyor rollers is meshed with the inner wall of the conveyor belt, and one of the conveyor rollers is fixedly connected to the output shaft of the drive motor.

[0008] Furthermore, the outer end of the reciprocating screw passes through one of the support plates and is fixedly equipped with a crank handle. The inner end of the reciprocating screw is rotatably mounted on the inner wall of another support plate. The positioning plate includes a connecting rod that is threadedly connected to the outer wall of the reciprocating screw. A guide vertical plate is fixedly installed at the end of the connecting rod near the circuit board, which can guide and position the circuit board.

[0009] Furthermore, in both the optical inspection unit and the electrical inspection unit, defective product frames are movably placed next to the worktable opposite the push rod, and good product frames are movably placed at the end of the conveyor belt. The push rod includes an electric telescopic rod fixedly installed on the side wall of the support plate, and a push plate is fixedly installed at the telescopic end of the electric telescopic rod.

[0010] Furthermore, the optical camera is fixedly mounted on the top wall of the support plate, and the control panel is fixedly mounted on the side wall of the support plate. The object sensor is fixedly mounted on the inner wall of the push plate near the circuit board, which can detect the presence of the circuit board.

[0011] Furthermore, the electrical testing unit includes another electrically operated telescopic rod fixedly mounted on the top wall of the support plate. The telescopic end of the electric telescopic rod is fixedly equipped with a mounting block, which is detachably connected to the test template via a bolt structure. Several probes are fixedly mounted on the test template to test the electrical performance of the circuit board.

[0012] Furthermore, a groove is fixedly provided on the inner wall of the support plate in the electrical testing unit, and a guide groove is fixedly provided on the inner wall of the groove. Another drive motor is installed inside the groove through a mounting bracket. A reciprocating screw is installed on the output end of the drive motor. The fixed frame includes a movable frame that is threadedly connected to the reciprocating screw. The inner end of the movable frame can move up and down in the guide groove. The outer end of the movable frame is detachably connected to the fixed template through a bolt structure. The fixed template can restrict and fix the circuit board inside the template.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: By rotating the reciprocating screw, the distance between the positioning plates can be adjusted, thereby positioning circuit boards of different widths and moving them to the center. This facilitates subsequent optical inspection units to perform image comparison inspection of the circuit boards and to conduct electrical performance tests using probes. A series of operating steps and correct circuit board image comparison diagrams can be preset on the control panel and compared with the images captured by the optical camera to sort out good and bad products. After testing by the test template, circuit boards that pass or fail the test are distinguished. The detection efficiency is high and the degree of automation is high. By adjusting the bolt structure, the test template and fixing template can be quickly and easily replaced to accommodate the detection and fixing of circuit boards of different specifications. Attached Figure Description

[0014] Figure 1 This is a top view of the structure of this utility model;

[0015] Figure 2 This is a side view of the electrical detection unit 5 of this utility model.

[0016] Figure 3 This is a side view schematic diagram of the structural optical detection unit 4 of this utility model;

[0017] Figure 4 This is a side view of the structural alignment adjustment unit 3 of this utility model;

[0018] Figure 5 This is a schematic diagram of part A of the structure of this utility model;

[0019] Figure 6 This is a schematic diagram of part B of the structure of this utility model.

[0020] In the diagram: 1. Workbench; 2. Conveyor belt; 3. Positioning adjustment unit; 4. Optical inspection unit; 5. Electrical inspection unit; 6. Reciprocating lead screw; 7. Positioning plate; 8. Fixed frame; 9. Push rod; 10. Object sensor; 11. Optical camera; 12. Test template; 13. Probe; 14. Support plate; 15. Conveyor roller; 16. Drive motor; 17. Handle; 18. Connecting rod; 19. Guide vertical plate; 20. Defective product frame; 21. Good product frame; 22. Electric telescopic rod; 23. Push plate; 24. Control panel; 25. Mounting block; 26. Bolt structure; 27. Groove; 28. Moving frame; 29. ​​Guide groove; 30. Fixed template. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention 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 invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0022] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of the utility model described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0023] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0024] Furthermore, some of the aforementioned terms, besides indicating location or positional relationships, may also have other meanings. For example, the term "above" may, in certain circumstances, indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances. Additionally, the term "multiple" should mean two or more.

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other. The following will refer to the accompanying drawings. Figures 1-6 The present invention will be described in detail with reference to the embodiments.

[0026] A circuit board testing device includes a workbench 1, a conveyor belt 2 rotatably mounted on the workbench 1, two sets of alignment adjustment units 3 on both sides of the conveyor belt 2, several support plates 14 and a drive motor 16 fixedly mounted on the outer wall of the workbench 1, and conveyor rollers 15 rotatably mounted at both ends of the workbench 1. The outer wall of the conveyor roller 15 meshes with the inner wall of the conveyor belt 2, and one of the conveyor rollers 15 is fixedly connected to the output shaft of the drive motor 16. The drive motor 16 is electrically connected to a control panel 24. The drive and stop times of the drive motor 16 can be preset in the PLC control system within the control panel 24 according to the detection time of the subsequent optical detection unit 4 and electrical detection unit 5. That is, the conveying and pausing of the conveyor belt 2 can be controlled. The drive motor 16 drives the conveyor roller 15 to rotate, thereby driving the conveyor belt 2 to convey along the workbench 1.

[0027] Optical inspection unit 4 and electrical inspection unit 5 are respectively installed at the conveying end of the two sets of alignment adjustment units 3. They can inspect the appearance and electrical performance of the circuit board respectively. The two sets of alignment adjustment units 3 can be pre-adjusted to the position suitable for the circuit board specifications to align and center the circuit board, so that the circuit board can be moved to the center, which is convenient for the subsequent inspection of the circuit board by the optical inspection unit 4 and the electrical inspection unit 5.

[0028] The alignment adjustment unit 3 includes a reciprocating lead screw 6, an alignment plate 7 is movably disposed on the outer wall of the reciprocating lead screw 6, the outer end of the reciprocating lead screw 6 passes through one of the support plates 14 and is fixedly disposed on a crank handle 17, the inner end of the reciprocating lead screw 6 is rotatably disposed on the inner wall of another support plate 14, the alignment plate 7 includes a connecting rod 18 threadedly connected to the outer wall of the reciprocating lead screw 6, and a guide vertical plate 19 is fixedly disposed at one end of the connecting rod 18 near the circuit board, which can guide and align the circuit board.

[0029] The alignment adjustment unit 3 can be adjusted for different specifications of circuit boards in each batch to ensure that circuit boards of different widths can be centered. Rotating the crank handle 17 causes the reciprocating screw 6 to rotate, which in turn drives the two connecting rods 18 to move closer to the circuit board until they stop when the circuit board can just pass through the center. This allows the guide plate 19 to guide and center the circuit board. The guide plate 19 is relatively wide when it faces the conveyor belt 2, which allows the circuit board to be guided to the center better.

[0030] Both the optical detection unit 4 and the electrical detection unit 5 include a retractable push rod 9, and an object sensor 10 is fixedly installed on the side of the push rod 9 facing the circuit board. The control panel 24 is electrically connected to the object sensor 10. The object sensor 10 faces one end of the circuit board along the conveyor belt 2. The object sensor 10 is a laser sensor in the prior art, which can detect the circuit board on the conveyor belt 2 with high precision. After detecting the circuit board, it transmits a signal to the PLC control system. The PLC control system controls the drive motor 16 to stop driving, so that the conveyor belt 2 stops conveying the circuit board.

[0031] The optical inspection unit 4 includes an optical camera 11, which can photograph the circuit boards on the conveyor belt 2. The optical camera 11 is fixedly mounted on the top wall of the support plate 14. After the circuit board is temporarily stopped from transporting, the PLC control system instructs the optical camera 11 to take pictures and videos of the circuit board. The images are transmitted to the PLC control system via signals and compared with preset images. If the appearance is unqualified, it is pushed into the defective product frame 20 by the push rod 9. If it is qualified, it continues to be transported by the conveyor belt 2. A control panel 24 is fixedly mounted on the side wall of the support plate 14. An object sensor 10 is fixedly mounted on the inner wall of the push plate 23 near the circuit board and can sense the presence of the circuit board.

[0032] The electrical testing unit 5 includes a test template 12 that matches the circuit board. The electrical testing unit 5 also includes a reciprocating lead screw 6. A fixed frame 8 is movably provided on the outer wall of the reciprocating lead screw 6. The fixed frame 8 includes a movable frame 28 and a fixed template 30. One side of the movable frame 28 is threadedly connected to the reciprocating lead screw 6. The other side of the movable frame 28 can move up and down in the guide groove 29. A guide groove 29 is also provided on the inner side wall of the support plate 14. The inner end of the movable frame 28 can move up and down in the guide groove 29.

[0033] The outer end of the movable frame 28 is detachably connected to the fixed template 30 via bolt structure 26. The fixed template 30 can confine the circuit board within the template and fix it. The mounting block 25 is detachably connected to the test template 12 via bolt structure 26. Several probes 13 are fixedly installed on the test template 12 to test the electrical performance of the circuit board.

[0034] The bolt structure 26 includes a threaded rod and a nut. The threaded rod can pass through the threaded hole between the fixed template 30 and the movable frame 28, and the threaded hole between the mounting block 25 and the test template 12. Then, the two are fixed together by the nut. The bolt structure 26 allows for easy replacement of the fixed template 30 and the test template 12 with circuit boards of different specifications and sizes. The test template 12 has the same circuit distribution as the circuit board to be tested. Several probes 13 can test the test points of the circuit board. The fixed template 30 can be wrapped around the outer wall of the circuit board, so that the circuit board can only be confined within the fixed template 30 and avoids movement during testing.

[0035] In both the optical inspection unit 4 and the electrical inspection unit 5, a defective product frame 20 is movably placed next to the workbench 1 opposite to the push rod 9. A good product frame 21 is movably placed at the end of the conveyor belt 2. The push rod 9 includes an electric telescopic rod 22 fixedly mounted on the side wall of the support plate 14. A push plate 23 is fixedly mounted on the telescopic end of the electric telescopic rod 22. The control panel 24 is electrically connected to the electric telescopic rod 22. The extension and retraction of the electric telescopic rod 22 can be indicated by the PLC control system, so that it drives the push plate 23 to push the sorted defective products into the defective product frame 20. The qualified good products are then transported along the conveyor belt 2 to the good product frame 21.

[0036] The electrical testing unit 5 includes another electric telescopic rod 22 fixedly mounted on the top wall of the support plate 14. The telescopic end of the electric telescopic rod 22 is fixedly mounted with a mounting block 25. A groove 27 is fixedly mounted on the inner side wall of the support plate 14 in the electrical testing unit 5. A guide groove 29 is fixedly mounted on the inner wall of the groove 27. Another drive motor 16 is mounted inside the groove through a mounting bracket. A reciprocating lead screw 6 is mounted on the output end of the drive motor 16. The control panel 24 is electrically connected to the drive motor 16.

[0037] When the object sensor 10 detects that the circuit board has entered the electrical testing unit 5, the conveyor belt 2 stops moving. At this time, the drive motor 16 is started, causing the moving frame 28 to move downwards along the guide groove 29, which in turn moves the fixed template 30 downwards until it is fitted onto the outer wall of the circuit board, thus limiting and fixing the circuit board. Then, the electric telescopic rod 22 is started, causing the test template 12 and several probes 13 to move downwards to perform electrical testing on the circuit board. The entire process is controlled by a PLC control system, achieving semi-automated testing and improving testing efficiency.

[0038] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A circuit board testing device, comprising a workbench (1), characterized in that: A conveyor belt (2) is rotatably mounted on the workbench (1). Two sets of alignment adjustment units (3) are mounted on both sides of the conveyor belt (2). Optical detection unit (4) and electrical detection unit (5) are respectively mounted at the conveyor tail end of the two sets of alignment adjustment units (3), which can detect the appearance and electrical performance of the circuit board respectively. Both the alignment adjustment unit (3) and the electrical detection unit (5) include a reciprocating screw (6), and an alignment plate (7) and a fixed frame (8) are movably mounted on the outer wall of the reciprocating screw (6). Both the optical detection unit (4) and the electrical detection unit (5) include a telescopic push rod (9), and an object sensor (10) is fixedly mounted on the side of the push rod (9) facing the circuit board. The optical detection unit (4) includes an optical camera (11), which can take pictures of the circuit board on the conveyor belt (2). The electrical detection unit (5) includes a test template (12) that matches the circuit board.

2. The circuit board testing device according to claim 1, characterized in that: The outer wall of the workbench (1) is fixedly provided with several support plates (14) and drive motors (16). The two ends of the workbench (1) are provided with conveyor rollers (15). The outer wall of the conveyor rollers (15) is meshed with the inner wall of the conveyor belt (2), and one of the conveyor rollers (15) is fixedly connected to the output shaft of the drive motor (16).

3. The circuit board testing device according to claim 2, characterized in that: The outer end of the reciprocating screw (6) passes through one of the support plates (14) and is fixedly equipped with a crank (17). The inner end of the reciprocating screw (6) is rotatably mounted on the inner wall of another support plate (14). The positioning plate (7) includes a connecting rod (18) that is threaded to the outer wall of the reciprocating screw (6). A guide vertical plate (19) is fixedly mounted on one end of the connecting rod (18) near the circuit board, which can guide and position the circuit board.

4. The circuit board testing device according to claim 3, characterized in that: In both the optical inspection unit (4) and the electrical inspection unit (5), a defective product frame (20) is movably placed next to the workbench (1) opposite to the push rod (9), and a good product frame (21) is movably placed at the end of the conveyor belt (2). The push rod (9) includes an electric telescopic rod (22) fixedly installed on the side wall of the support plate (14), and a push plate (23) is fixedly installed at the telescopic end of the electric telescopic rod (22).

5. The circuit board testing device according to claim 4, characterized in that: An optical camera (11) is fixedly mounted on the top wall of a support plate (14), and a control panel (24) is fixedly mounted on the side wall of the support plate (14). An object sensor (10) is fixedly mounted on the inner wall of the push plate (23) near the circuit board, and can sense the presence of the circuit board.

6. The circuit board testing device according to claim 5, characterized in that: The electrical testing unit (5) includes another electric telescopic rod (22) fixedly installed on the top wall of the support plate (14). The telescopic end of the electric telescopic rod (22) is fixedly provided with a mounting block (25). The mounting block (25) is detachably connected to the test template (12) through a bolt structure (26). Several probes (13) are fixedly installed on the test template (12) to test the electrical performance of the circuit board.

7. The circuit board testing device according to claim 6, characterized in that: A groove (27) is fixedly provided on the inner wall of the support plate (14) in the electrical testing unit (5). A guide groove (29) is fixedly provided on the inner wall of the groove (27). Another drive motor (16) is provided inside the groove through a mounting bracket. A reciprocating screw (6) is provided on the output end of the drive motor (16). The fixed frame (8) includes a movable frame (28) that is threadedly connected to the reciprocating screw (6). The inner end of the movable frame (28) can move up and down in the guide groove (29). The outer end of the movable frame (28) is detachably connected to the fixed template (30) through a bolt structure (26). The fixed template (30) can restrict the circuit board to be fixed inside the template.

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