PCB circuit board detection system and detection method thereof

Abstract

The present invention discloses a PCB circuit board detection system and a detection method thereof, and relates to the technical field of PCB circuit board detection. The PCB circuit board detection system comprises a detection platform body and a moving mechanism installed on the top surface of the detection platform body, and is characterized in that: a limiting mechanism is installed on the top surface of the moving mechanism, a loading plate is installed on the top of the detection platform body on one side of the moving mechanism, and a unloading plate is installed on the top of the detection platform body on the other side of the moving mechanism. During the movement of the limit plate of the present invention, the closed coil is synchronously driven to move, and the closed coil cuts the magnetic flux lines between the first magnet plate and the second magnet plate, and the closed coil generates an induced current. The controller comprises a current sensing module, and the magnitude of the induced current is detected by the current sensing module. If the sliding block is stuck, the moving speed of the limit plate is reduced, and the induced current is also reduced. At this time, the alarm is controlled by the controller to give an alarm prompt, which effectively reduces the detection error.

Description

Technical Field

[0001] The present invention relates to the technical field of PCB circuit board detection, and in particular to a PCB circuit board detection system and a detection method thereof. Background Art

[0002] PCB, or printed circuit board, is one of the important components of the electronics industry. Almost every electronic device, from electronic watches and calculators to computers, communication electronic equipment, and military weapon systems, as long as there are electronic components such as integrated circuits, must use printed circuit boards to make electrical interconnections between the various components. The printed circuit board consists of an insulating base plate, connecting wires, and pads for assembling and welding electronic components. It has the dual functions of a conductive line and an insulating base plate. It can replace complex wiring to achieve electrical connections between components in the circuit, which not only simplifies the assembly and welding of electronic products, reduces the wiring workload under traditional methods, and greatly reduces the labor intensity of workers; it also reduces the size of the whole machine, reduces product costs, and improves the quality and reliability of electronic equipment. The printed circuit board has good product consistency, and it can adopt standardized design, which is conducive to mechanization and automation in the production process.

[0003] After the PCB circuit board is produced, it is necessary to inspect the PCB circuit board. In the prior art, an automated track structure or a screw structure is generally used to automatically load and unload the PCB circuit board to complete the inspection. However, the positioning requirements are high during the PCB circuit board inspection process, and the stability of the PCB circuit board must be ensured during the movement, otherwise it will cause obvious inspection errors.

[0004] In the existing technology, there are many devices for automatic detection of PCB circuit boards, such as Chinese patent CN201520327723.2, which discloses an automatic optical detection system for printed circuit boards, which includes a base, a displacement electric cylinder, a first stage, a second stage and a sorting platform, wherein the first stage and the sorting platform are arranged on the base, and the second stage is connected to the displacement electric cylinder and arranged relative to the first stage. The automatic optical detection system for printed circuit boards provided by the utility model adopts a double-platform carrier and a two-way air groove to realize vacuuming to ensure the flatness of the printed circuit board, and can also realize the blowing function to form an air bed to avoid copper surface scratches during the movement of the board. This structure effectively reduces the influence of PCB bending and board warping on the imaging of the linear array camera. However, it uses a displacement electric cylinder as a driving mechanism, and the use time is too long, and it is not timely repaired and the displacement electric cylinder fails, which is easy to cause deviations in the moving process and affect the detection effect.

[0005] In the process of flipping the PCB circuit board, Chinese patent CN202110950374.X discloses a PCB printed circuit board detection system, which includes a base frame, a material table, a material shifting mechanism, a conveyor belt, a detector and a controller; the present invention uses the provided conveyor belt and material shifting mechanism to control these devices through the controller to automatically load and unload the PCB printed circuit board and flip the board, replacing the manual loading and unloading and flipping steps in the existing PCB printed circuit board detection system, thereby achieving the convenience of detecting the PCB printed circuit board and maintaining the stability of the working rhythm, thereby improving the operation effect of the PCB printed circuit board detection system. The material shifting mechanism adopts the structure of a sliding rod and a slider for transmission, and there is a possibility of instability and imbalance during the transmission process, which is also easy to affect the detection results. Summary of the invention

[0006] Technical issues solved

[0007] In view of the deficiencies in the prior art, the present invention provides a PCB circuit board detection system and a detection method thereof, which solves the problem that the existing transmission mechanism easily causes deviations in the moving process and affects the detection effect.

[0008] Technical Solution

[0009] To achieve the above objectives, the present invention is implemented through the following technical solutions: a PCB circuit board detection system, including a detection table body and a moving mechanism installed on the top surface of the detection table body, a limiting mechanism is installed on the top surface of the moving mechanism, a loading plate is installed on the top of the detection table body on one side of the moving mechanism, a unloading plate is installed on the top of the detection table body on the other side of the moving mechanism, and a detection mechanism is installed on the top of the detection table body above the limiting mechanism.

[0010] Preferably, the moving mechanism includes a fixed seat and a moving assembly, four fixed seats are evenly distributed on the top of the detection platform body, and the moving assembly is installed inside the fixed seat.

[0011] Preferably, the moving component includes a sliding block and an electromagnet, a long connecting shaft is commonly installed between two adjacent fixed seats with a larger distance, and two short connecting shafts are commonly installed between adjacent fixed seats with a closer distance, the top surfaces of the two long connecting shafts are both movably installed with sliding blocks, the top surfaces of the sliding blocks are commonly installed with a mounting base plate, the top surface of the mounting base plate is installed with a limiting mechanism, the top surface of the short connecting shaft is installed with a mounting seat, and the top surface of the mounting seat is installed with an electromagnet.

[0012] Preferably, the limiting mechanism comprises a limiting plate and a limiting slot, the limiting plate is installed on the top surface of the mounting substrate, the limiting slot is provided on the top surface of the limiting plate, and the speed measuring mechanism is installed inside the limiting plate.

[0013] Preferably, the speed measuring mechanism comprises a measuring component and a magnetic induction component, the magnetic induction component is installed inside the limit plate, and the measuring component is installed outside the detection platform body.

[0014] Preferably, the magnetic induction component includes a magnet filling block and a closed coil, the magnet filling block is installed inside the limiting plate, a magnetic isolation plate is installed inside the limiting plate on one side of the magnet filling block, and a closed coil is installed inside the limiting plate on one side of the magnetic isolation plate.

[0015] Preferably, the measuring component includes a first magnet plate and a second magnet plate, the first magnet plate is mounted on the surface of one side of the detection platform body, the second magnet plate is mounted on the surface of the other side of the detection platform body, a controller is mounted inside the detection platform body, a support seat is mounted on the top surface of the short connecting shaft, and an alarm is mounted on the top surface of the support seat.

[0016] Preferably, the detection mechanism includes a support frame and a detection component, the support frames are respectively installed on the top end surfaces of the detection platform body on both sides outside the limit plate, the driving motor is installed on the bottom end surface of the support frame, the moving screw rod is installed on the top end surface of the support frame, the outer surface of the moving screw rod is movably sleeved with a moving slider, and the outer surface of the moving slider is jointly installed with the detection component.

[0017] Preferably, the detection component includes a threaded screw and a detection probe, the outer surface of the movable slider is jointly installed with the threaded screw, the outer surface of the threaded screw is movably mounted with an internally threaded slider, a stepper motor is installed on one end surface of the threaded screw, a limit seat is installed on the outer surface of the internally threaded slider, the bottom surface of the limit seat is installed with the detection probe, and the top surface of the limit seat is installed with an optical camera.

[0018] The present invention also provides a detection method using a PCB circuit board detection system, comprising the following steps:

[0019] S1: The PCB to be tested is placed on the loading plate. A manipulator is installed next to the testing table body. The PCB to be tested is moved to the limit plate by the manipulator, and the PCB to be tested is in contact with the limit slot;

[0020] S2: The controller controls the driving motor, and the driving motor drives the moving lead screw to rotate, thereby driving the moving slider to move, thereby adjusting the height of the internal thread slider, so that the detection probe and the optical camera are at a suitable detection height;

[0021] S3: The stepper motor drives the threaded screw to rotate, thereby driving the internal thread slider to rotate, so that the detection probe and the optical camera move back and forth above the limit plate;

[0022] S4: The current flowing through the electromagnet is gradually increased by the controller. At this time, the magnetism of the electromagnet and the corresponding surface of the magnet filling block are opposite, so the magnetic attraction between the electromagnet and the magnet filling block increases, thereby driving the limit plate to gradually move on the long connecting support shaft through the sliding block;

[0023] S5: By controlling the direction of the current flowing through the electromagnet, a magnetic repulsive force can be generated between the electromagnet and the magnet filling block, so that the limit plate moves in the opposite direction, thereby realizing the reciprocating movement of the PCB circuit board, thereby coordinating the movement of the detection probe and the optical camera to perform circuit detection and optical detection on the PCB circuit board;

[0024] S6: In the process of driving the limit plate to move, the closed coil is also driven to move synchronously. The closed coil cuts the magnetic flux lines between the first magnet plate and the second magnet plate, and generates an induced current. The controller includes a current sensing module, which detects the magnitude of the induced current. If the movement of the sliding block is stuck, the movement speed of the limit plate decreases, and the induced current also decreases. At this time, the alarm is controlled by the controller to give an alarm prompt, which effectively reduces the detection error.

[0025] Beneficial Effects

[0026] The present invention has the following beneficial effects:

[0027] (1) The PCB circuit board detection system controls the driving motor through a controller, and the driving motor drives the moving screw to rotate, thereby driving the moving slider to move, thereby adjusting the height of the internal thread slider, so that the detection probe and the optical camera are at a suitable detection height, and the stepping motor drives the threaded screw to rotate, thereby driving the internal thread slider to rotate, so that the detection probe and the optical camera move back and forth above the limit plate.

[0028] (2) The PCB circuit board detection system controls the direction and strength of the current flowing through the electromagnet through a controller, thereby realizing the reciprocating movement of the PCB circuit board, thereby coordinating the movement of the detection probe and the optical camera to perform circuit detection and optical detection on the PCB circuit board.

[0029] (3) The PCB circuit board detection system drives the limit plate to move, and synchronously drives the closed coil to move. The closed coil cuts the magnetic flux lines between the first magnet plate and the second magnet plate, and generates an induced current. The controller includes a current sensing module, and the magnitude of the induced current is detected by the current sensing module. If the movement of the sliding block is stuck, the movement speed of the limit plate decreases, and the induced current also decreases. At this time, the controller controls the alarm to give an alarm prompt, which effectively reduces the detection error.

[0030] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall external structure of the present invention;

[0032] Figure 2 This is a schematic diagram of the external structure of the bottom of the present invention;

[0033] Figure 3 It is a side view schematic diagram of the overall external structure of the present invention;

[0034] Figure 4 It is a schematic top view of the overall external structure of the present invention;

[0035] Figure 5 This is a schematic diagram of the external structure of the limiting plate of the present invention;

[0036] Figure 6 It is a schematic diagram of the internal structure of the limiting plate of the present invention.

[0037] In the figure, 1. the detection table body; 2. the loading plate; 3. the unloading plate; 4. the fixing seat; 5. the long connecting support shaft; 6. the short connecting support shaft; 7. the sliding block; 8. the mounting base plate; 9. the mounting seat; 10. the electromagnet; 11. the limit plate; 12. the limit slot; 13. the magnet filling block; 14. the magnetic isolation plate; 15. the closed coil; 16. the first magnet plate; 17. the second magnet plate; 18. the controller; 19. the alarm; 20. the supporting seat; 21. the supporting frame; 22. the driving motor; 23. the moving screw rod; 24. the moving slider; 25. the threaded screw rod; 26. the internal thread slider; 27. the stepping motor; 28. the limit seat; 29. ​​the detection probe; 30. the optical camera. DETAILED DESCRIPTION

[0038] 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.

[0039] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "all around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0040] See also Figure 1-Figure 6The embodiment of the present invention provides a technical solution: a PCB circuit board detection system, comprising a detection platform body 1 and a moving mechanism installed on the top surface of the detection platform body 1, a limiting mechanism is installed on the top surface of the moving mechanism, a loading plate 2 is installed on the top of the detection platform body 1 on one side of the moving mechanism, a unloading plate 3 is installed on the top of the detection platform body 1 on the other side of the moving mechanism, and a detection mechanism is installed on the top of the detection platform body 1 above the limiting mechanism.

[0041] Specifically, the moving mechanism includes a fixed seat 4 and a moving component. Four fixed seats 4 are evenly distributed on the top of the detection platform body 1. The moving component is installed inside the fixed seat 4. The moving component includes a sliding block 7 and an electromagnet 10. A long connecting support shaft 5 is commonly installed between two adjacent fixed seats 4 with a large distance, and two short connecting support shafts 6 are commonly installed between the adjacent fixed seats 4 with a close distance. The top surfaces of the two long connecting support shafts 5 are both movably installed with sliding blocks 7, and the top surfaces of the sliding blocks 7 are commonly installed with a mounting substrate 8. The top surface of the mounting substrate 8 is installed with a limiting mechanism, the top surface of the short connecting support shaft 6 is installed with a mounting seat 9, and the top surface of the mounting seat 9 is installed with an electromagnet 10.

[0042] Furthermore, the limiting mechanism includes a limiting plate 11 and a limiting slot 12. The limiting plate 11 is installed on the top surface of the mounting substrate 8. The limiting slot 12 is provided on the top surface of the limiting plate 11. A speed measuring mechanism is installed inside the limiting plate 11. The PCB circuit board to be tested is placed on the loading plate 2. A manipulator is installed next to the testing platform body 1. The PCB circuit board to be tested is moved to the limiting plate 11 by the manipulator, and the PCB circuit board to be tested is in contact with the limiting slot 12.

[0043] Furthermore, the speed measuring mechanism includes a measuring component and a magnetic induction component. The magnetic induction component is installed inside the limit plate 11, and the measuring component is installed on the outside of the detection platform body 1. The magnetic induction component includes a magnet filling block 13 and a closed coil 15. The magnet filling block 13 is installed inside the limit plate 11, a magnetic isolation plate 14 is installed inside the limit plate 11 on one side of the magnet filling block 13, and a closed coil 15 is installed inside the limit plate 11 on one side of the magnetic isolation plate 14.

[0044] Furthermore, the measuring component includes a first magnet plate 16 and a second magnet plate 17. The first magnet plate 16 is installed on the surface of one side of the detection platform body 1, and the second magnet plate 17 is installed on the surface of the other side of the detection platform body 1. A controller 18 is installed inside the detection platform body 1, and a support seat 20 is installed on the top surface of the short connecting support shaft 6. An alarm 19 is installed on the top surface of the support seat 20. In the process of driving the limit plate 11 to move, the closed coil 15 is synchronously driven to move. The closed coil 15 cuts the magnetic flux lines between the first magnet plate 16 and the second magnet plate 17, and the closed coil 15 generates an induced current. The controller 18 includes a current sensing module, which detects the magnitude of the induced current. If the sliding block 7 is stuck, the moving speed of the limit plate 11 decreases, and the induced current also decreases. At this time, the alarm 19 is controlled by the controller 18 to give an alarm prompt, which effectively reduces the detection error.

[0045] Furthermore, the detection mechanism includes a support frame 21 and a detection component. The top surfaces of the detection platform body 1 on both sides outside the limit plate 11 are respectively installed with support frames 21, the bottom surfaces of the support frames 21 are installed with a driving motor 22, the top surface of the support frame 21 is installed with a moving screw rod 23, the outer surface of the moving screw rod 23 is movably sleeved with a moving slider 24, and the outer surface of the moving slider 24 is jointly installed with a detection component. The driving motor 22 is controlled by the controller 18, and the driving motor 22 drives the moving screw rod 23 to rotate, thereby driving the moving slider 24 to move.

[0046] Furthermore, the detection component includes a threaded screw 25 and a detection probe 29. The outer surface of the movable slider 24 is jointly installed with the threaded screw 25. The outer surface of the threaded screw 25 is movably mounted with an internally threaded slider 26. A stepper motor 27 is installed on one end surface of the threaded screw 25. A limit seat 28 is installed on the outer surface of the internally threaded slider 26. The detection probe 29 is installed on the bottom surface of the limit seat 28. The optical camera 30 is installed on the top surface of the limit seat 28. The threaded screw 25 is driven to rotate by the stepper motor 27, thereby driving the internally threaded slider 26 to rotate, so that the detection probe 29 and the optical camera 30 move back and forth above the limit plate 11.

[0047] When in use (working), the PCB circuit board to be tested is placed on the loading plate 2, and a manipulator is installed next to the testing platform body 1. The manipulator moves the PCB circuit board to be tested to the limiting plate 11, and the PCB circuit board to be tested is in contact with the limiting card slot 12;

[0048] The driving motor 22 is controlled by the controller 18, and the driving motor 22 drives the moving screw 23 to rotate, thereby driving the moving slider 24 to move, thereby adjusting the height of the internal thread slider 26, so that the detection probe 29 and the optical camera 30 are at a suitable detection height;

[0049] The stepping motor 27 drives the threaded screw 25 to rotate, thereby driving the internal threaded slider 26 to rotate, so that the detection probe 29 and the optical camera 30 move back and forth above the limit plate 11;

[0050] The current flowing through the electromagnet 10 is gradually increased by the controller 18. At this time, the magnetism of the corresponding surfaces of the electromagnet 10 and the magnet filling block 13 is opposite, so the magnetic attraction between the electromagnet 10 and the magnet filling block 13 increases, thereby driving the limit plate 11 to gradually move on the long connecting support shaft 5 through the sliding block 7;

[0051] By controlling the direction of the current flowing through the electromagnet 10, a magnetic repulsive force can be generated between the electromagnet 10 and the magnet filling block 13, so that the limit plate 11 moves in the opposite direction, and the reciprocating movement of the PCB circuit board is realized, thereby coordinating the movement of the detection probe 29 and the optical camera 30 to perform circuit detection and optical detection on the PCB circuit board;

[0052] In the process of driving the limit plate 11 to move, the closed coil 15 is also driven to move synchronously. The closed coil 15 cuts the magnetic flux lines between the first magnet plate 16 and the second magnet plate 17, and generates an induced current. The controller 18 includes a current sensing module, which detects the magnitude of the induced current. If the sliding block 7 is stuck, the moving speed of the limit plate 11 decreases, and the induced current also decreases. At this time, the alarm 19 is controlled by the controller 18 to issue an alarm prompt, which effectively reduces the detection error.

[0053] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0054] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A PCB circuit board detection system, comprising a detection platform body (1) and a moving mechanism installed on the top surface of the detection platform body (1), characterized in that: A limiting mechanism is installed on the top surface of the moving mechanism, a loading plate (2) is installed on the top of the detection platform body (1) on one side of the moving mechanism, a unloading plate (3) is installed on the top of the detection platform body (1) on the other side of the moving mechanism, and a detection mechanism is installed on the top of the detection platform body (1) above the limiting mechanism; The limiting mechanism comprises a limiting plate (11) and a limiting slot (12); the limiting plate (11) is installed on the top surface of the mounting substrate (8); the limiting slot (12) is provided on the top surface of the limiting plate (11); and a speed measuring mechanism is installed inside the limiting plate (11); The speed measuring mechanism comprises a measuring component and a magnetic induction component, the magnetic induction component is installed inside the limit plate (11), and the measuring component is installed outside the detection platform body (1); The magnetic induction component comprises a magnet filling block (13) and a closed coil (15); the magnet filling block (13) is installed inside the limiting plate (11); a magnetic isolation plate (14) is installed inside the limiting plate (11) on one side of the magnet filling block (13); and a closed coil (15) is installed inside the limiting plate (11) on one side of the magnetic isolation plate (14); The measuring assembly comprises a first magnet plate (16) and a second magnet plate (17); the first magnet plate (16) is mounted on one side surface of the detection platform body (1); the second magnet plate (17) is mounted on the other side surface of the detection platform body (1); a controller (18) is mounted inside the detection platform body (1); a support seat (20) is mounted on the top surface of the short connecting support shaft (6); and an alarm (19) is mounted on the top surface of the support seat (20).

2. A PCB circuit board detection system according to claim 1, characterized in that: The moving mechanism comprises a fixed seat (4) and a moving assembly. Four fixed seats (4) are evenly distributed on the top of the detection platform body (1), and the moving assembly is installed inside the fixed seat (4).

3. A PCB circuit board detection system according to claim 2, characterized in that: The moving assembly comprises a sliding block (7) and an electromagnet (10); a long connecting support shaft (5) is installed between two adjacent fixed seats (4) at a relatively long distance; two short connecting support shafts (6) are installed between adjacent fixed seats (4) at a relatively short distance; the top surfaces of the two long connecting support shafts (5) are both movably installed with sliding blocks (7); the top surfaces of the sliding blocks (7) are jointly installed with a mounting base plate (8); a limiting mechanism is installed on the top surface of the mounting base plate (8); a mounting seat (9) is installed on the top surface of the short connecting support shaft (6); and the top surface of the mounting seat (9) is installed with an electromagnet (10).

4. A PCB circuit board detection system according to claim 3, characterized in that: The detection mechanism comprises a support frame (21) and a detection component. The top surfaces of the detection platform body (1) on both sides outside the limit plate (11) are respectively mounted with the support frames (21), the bottom surface of the support frame (21) is mounted with a driving motor (22), the top surface of the support frame (21) is mounted with a moving screw rod (23), the outer surface of the moving screw rod (23) is movably sleeved with a moving slider (24), and the outer surface of the moving slider (24) is jointly mounted with the detection component.

5. A PCB circuit board detection system according to claim 4, characterized in that: The detection component comprises a threaded screw (25) and a detection probe (29); the outer surface of the movable slider (24) is commonly mounted with the threaded screw (25); the outer surface of the threaded screw (25) is movably sleeved with an internal threaded slider (26); a stepping motor (27) is mounted on one end surface of the threaded screw (25); a limit seat (28) is mounted on the outer surface of the internal threaded slider (26); the bottom surface of the limit seat (28) is mounted with the detection probe (29); and the top surface of the limit seat (28) is mounted with an optical camera (30).

6. The detection method of a PCB circuit board detection system according to claim 5, characterized in that: The steps include: S1: placing a PCB circuit board to be tested on a loading plate (2), and a manipulator is installed next to the testing platform body (1), and the PCB circuit board to be tested is moved onto the limiting plate (11) by the manipulator, so that the PCB circuit board to be tested is in contact with the limiting slot (12); S2: Controlling the driving motor (22) through the controller (18), driving the moving lead screw (23) through the driving motor (22) to rotate, thereby driving the moving slider (24) to move, thereby adjusting the height of the internal thread slider (26), so that the detection probe (29) and the optical camera (30) are at a suitable detection height; S3: The threaded screw (25) is driven to rotate by the stepping motor (27), thereby driving the internal threaded slider (26) to rotate, so that the detection probe (29) and the optical camera (30) move back and forth above the limit plate (11); S4: The current flowing through the electromagnet (10) is gradually increased by the controller (18). At this time, the magnetism of the corresponding surfaces of the electromagnet (10) and the magnet filling block (13) is opposite, so the magnetic attraction between the electromagnet (10) and the magnet filling block (13) increases, thereby driving the limit plate (11) to gradually move on the long connecting support shaft (5) through the sliding block (7); S5: By controlling the direction of the current flowing through the electromagnet (10) to change, a magnetic repulsive force can be generated between the electromagnet (10) and the magnet filling block (13), so that the limit plate (11) moves in the opposite direction, thereby realizing the reciprocating movement of the PCB circuit board, thereby coordinating the movement of the detection probe (29) and the optical camera (30) to perform circuit detection and optical detection on the PCB circuit board; S6: In the process of driving the limit plate (11) to move, the closed coil (15) is synchronously driven to move, and the closed coil (15) performs a cutting magnetic flux line movement between the first magnet plate (16) and the second magnet plate (17), and the closed coil (15) generates an induced current. The controller (18) includes a current sensing module, and the magnitude of the induced current is detected by the current sensing module. If the movement of the sliding block (7) is stuck, the movement speed of the limit plate (11) is reduced, and the induced current is also reduced. At this time, the alarm (19) is controlled by the controller (18) to issue an alarm prompt, thereby effectively reducing the detection error.

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