Laser engraving equipment of PCB (Printed Circuit Board) appearance detection system

Abstract

The invention relates to the technical field of PCB inspection, and discloses a laser engraving device of a PCB appearance detection system, the laser engraving device comprises a fixing frame, the upper surface of the fixing frame is fixedly connected with a first motor, the output end of the first motor is fixedly provided with a rotating rod, the outer wall of the rotating rod is fixedly connected with a rotating plate, and the rotating plate is fixedly connected with a rotating shaft. A first rotating shaft is fixedly connected to the interior of the rotating plate, a rotating block is rotatably connected to the outer wall of the first rotating shaft, a second rotating shaft is fixedly connected to the interior of the rotating block, a sliding plate is rotatably connected to the outer wall of the second rotating shaft, a limiting block is fixedly connected to the upper surface of the sliding plate, and a limiting strip is slidably connected to the interior of the limiting block. The first motor is started to drive the rotating rod to rotate, through cooperation of the rotating plate, the first rotating shaft, the rotating block, the second rotating shaft, the sliding plate, the limiting block, the connecting plate, the spring and the clamping plates, the distance between the clamping plates is adjusted, the effect of being suitable for PCBs of different sizes and fixing the PCBs is achieved, and the stability in the transferring process is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of PCB board inspection, and in particular to a laser marking device for a PCB board appearance inspection system. Background Art

[0002] A PCB is a substrate used to support and connect electronic components. It's made of an insulating material, typically glass-fiber-reinforced epoxy or phenolic resin, with a copper foil-formed circuit pattern. Automated laser marking can improve production efficiency and reduce manual labor, which is why laser marking equipment is used in PCB appearance inspection systems.

[0003] Laser marking equipment in PCB appearance inspection systems uses laser technology to mark PCBs. Existing PCB laser marking technology can be inefficient and require manual handling of PCBs, resulting in low marking accuracy and inefficiency. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the present invention provides a laser marking device for a PCB board appearance inspection system, which solves the problem of manual handling of PCB boards.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a laser engraving device for a PCB board appearance inspection system, comprising a fixed frame, the upper surface of the fixed frame is fixedly connected to a first motor, the output end of the first motor is fixedly provided with a rotating rod, the outer wall of the rotating rod is rotatably connected to the interior of the fixed frame, the outer wall of the rotating rod is fixedly connected to a rotating plate, the interior of the rotating plate is fixedly connected to a first rotating shaft, the outer wall of the first rotating shaft is rotatably connected to a rotating block, the interior of the rotating block is fixedly connected to a second rotating shaft, the outer wall of the second rotating shaft is rotatably connected to a slide, the upper surface of the slide is fixedly connected to a limiting block, the interior of the limiting block is slidably connected to a limiting bar, the upper surface of the limiting bar is fixedly connected to the interior of the fixed frame, the lower surface of the slide is fixedly connected to a connecting plate, the outer wall of the connecting plate is slidably connected to the interior of the fixed frame, and the outer wall of the connecting plate is provided with a buffer assembly.

[0006] By adopting the above technical solution, the first motor is started to drive the rotating rod to rotate, and the rotating rod will drive the rotating block to rotate through the rotating plate and the first rotating shaft. The rotation of the rotating block can drive the second rotating shaft and the slide to slide. The slide will drive the limit block to slide through the limit bar, thereby driving the connecting plate to slide synchronously through the sliding of the slide, and then driving the splint to slide, and the distance between the splints can be adjusted to clamp and fix PCB boards of different sizes.

[0007] Preferably, the buffer assembly includes a spring, the outer wall of the spring is fixedly connected to the outer wall of the connecting plate, and the outer wall of the spring is fixedly connected to a clamping plate.

[0008] Preferably, the upper surface of the fixing frame is fixedly connected with a sliding rod, the outer wall of the sliding rod is slidably connected with a slider, the interior of the slider is slidably connected with a limit plate, and the outer wall of the limit plate is fixedly connected with a bracket.

[0009] Preferably, the outer wall of the bracket is fixedly connected to a second motor, the output end of the second motor is fixedly provided with a first connecting shaft, and the outer wall of the first connecting shaft is rotatably connected to the inside of the bracket.

[0010] Preferably, the outer wall of the first connecting shaft is fixedly connected to a connecting plate, the interior of the connecting plate is rotatably connected to a second connecting shaft, and the outer wall of the second connecting shaft is fixedly connected to the interior of the sliding rod.

[0011] Preferably, the lower surface of the bracket is fixedly connected to the base, the upper surface of the base is provided with an engraving mechanism, the upper surface of the base is provided with a detection mechanism, the outer wall of the base is fixedly connected to the third motor, the output end of the third motor is fixedly provided with a conveyor belt, and the outer wall of the conveyor belt is rotatably connected to the inside of the base.

[0012] Preferably, the outer wall of the base is fixedly connected to a connecting frame, the interior of the connecting frame is fixedly connected to a classification frame, the interior of the connecting frame is fixedly connected to a connecting block, the outer wall of the connecting block is fixedly connected to a first fixed seat, and the interior of the first fixed seat is rotatably connected to a first fixed shaft.

[0013] Preferably, the outer wall of the first fixed shaft is fixedly connected to a connecting plate, the outer wall of the connecting plate is fixedly connected to a cylinder, the output end of the cylinder is fixedly provided with a second fixed seat, the interior of the second fixed seat is fixedly connected to a second fixed shaft, and the outer wall of the second fixed shaft is slidably connected to a push plate.

[0014] Preferably, the push plate is fixedly connected to a fixed column inside, the outer wall of the fixed column is rotatably connected to the inside of the classification frame, the outer wall of the fixed column is fixedly connected to a baffle, and the outer wall of the baffle is slidably connected to the inner wall of the classification frame.

[0015] A method for using a laser marking device of a PCB board appearance inspection system, the method being used for the laser marking device of the PCB board appearance inspection system, the method comprising the following steps:

[0016] S1. Adjust the distance between the clamps to fix PCB boards of different sizes;

[0017] S2, move the PCB board clamping to the engraving mechanism position;

[0018] S3. After the engraving is completed, it is transported to the detection mechanism through a conveyor belt;

[0019] S4. The detection mechanism sends the detection results to the control system, and the control system controls the position of the baffle to sort the PCB boards according to different detection results.

[0020] Working principle: When the device is needed, the distance between the clamping plates is adjusted according to the different sizes of PCB boards. The first motor is started to drive the rotating rod to rotate. When the rotating rod rotates, it drives the rotating plate to rotate. The rotating plate drives the rotating block to rotate through the first rotating shaft. When the rotating block rotates, it pulls the slide plate to slide through the second rotating shaft. When the slide plate slides, it drives the limit block to slide through the limit bar. When the slide plate slides, it drives the connecting plate to slide at the same time. PCB boards of different sizes will push the clamping plates and squeeze the springs. By adjusting the distance between the connecting plates on both sides, the PCB boards are clamped and fixed, achieving the effect of adapting to PCB boards of different sizes and fixing them, ensuring stability during the transfer process;

[0021] When the PCB board needs to be transferred and inspected, the second motor is started to drive the first connecting shaft to rotate. When the first connecting shaft rotates, the connecting plate is driven to rotate. The connecting plate drives the sliding rod to slide inside the slider through the second connecting shaft, and pushes the slider to slide through the limit plate during the sliding process. The position of the PCB board is transferred by adjusting the position of the sliding rod, thereby achieving automatic clamping and transfer of the PCB, ensuring the accurate position of the PCB board during engraving.

[0022] The engraving mechanism can be used to laser engrave PCBs. By activating the third motor, a conveyor belt can be driven to transport the PCBs to the bottom of the engraving mechanism for inspection. The engraving mechanism is connected to a control system and can send the inspection results to the control system. The control system controls the cylinder to adjust the position of the baffle. The PCBs can be sorted according to the shape of the classification frame and the position of the baffle. When the inspection result is qualified, the control system controls the activation of the cylinder, which pushes the second fixed seat to slide. The second fixed seat drives the second fixed shaft to slide during the sliding process. At the same time, the second fixed shaft slides on the inner wall of the push plate and drives the push plate to rotate during the sliding process. When the push plate rotates, it drives the fixed column and baffle to rotate simultaneously, blocking one side of the discharge port, so that qualified PCBs can be discharged. Conversely, if the inspection result is unqualified, the control system controls the activation of the cylinder again to rotate the baffle in the opposite direction, so that it rotates to the other side of the discharge port, thereby sorting the PCBs. This achieves the effect of automatically sorting PCBs and facilitating the rapid identification and isolation of unqualified products.

[0023] The present invention provides a laser marking device for a PCB appearance inspection system. It has the following beneficial effects:

[0024] 1. The present invention starts the first motor to drive the rotating rod to rotate, and adjusts the distance between the splints through the cooperation among the rotating plate, the first rotating shaft, the rotating block, the second rotating shaft, the slide plate, the limit block, the connecting plate, the spring and the splint, so as to achieve the effect of being suitable for PCB boards of different sizes and fixing them, thereby ensuring stability during the transfer process.

[0025] 2. The present invention starts the second motor to drive the first connecting shaft to rotate, and through the cooperation between the connecting plate, the second connecting shaft, the sliding rod, the slider and the limit plate, drives the PCB board to move through the fixing frame, so as to automatically move the PCB to the engraving position and ensure the accurate position of the PCB board during engraving.

[0026] 3. The present invention starts the cylinder to push the second fixed seat to slide, and through the cooperation between the second fixed shaft, the push plate, the fixed column and the baffle, the distance of the baffle is adjusted according to the detection results received by the control system, so as to achieve the effect of automatic sorting of PCB boards, facilitating the rapid identification and isolation of unqualified products. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A perspective view of the present invention;

[0028] Figure 2 It is a schematic diagram of the local structure of the classification frame of the present invention;

[0029] Figure 3 It is a schematic diagram of the local structure of the limiting plate of the present invention;

[0030] Figure 4 It is a schematic cross-sectional view of the internal structure of the fixing frame of the present invention;

[0031] Figure 5 It is a schematic diagram of the local structure of the rotating block of the present invention;

[0032] Figure 6 It is a schematic cross-sectional view of the internal structure of the connecting frame of the present invention;

[0033] Figure 7 It is a schematic diagram of the partial structure of the cylinder of the present invention;

[0034] Figure 8 It is a schematic diagram of the process of the present invention.

[0035] Among them, 1. fixed frame; 2. first motor; 3. rotating rod; 4. rotating plate; 5. first rotating shaft; 6. rotating block; 7. second rotating shaft; 8. slide plate; 9. limit block; 10. limit strip; 11. connecting plate; 12. spring; 13. splint; 14. sliding rod; 15. slider; 16. limit plate; 17. bracket; 18. second motor; 19. first connecting shaft; 20. connecting plate; 21. second connecting shaft; 22. base; 23. engraving mechanism; 24. detection mechanism; 25. third motor; 26. conveyor belt; 27. connecting frame; 28. classification frame; 29. connecting block; 30. first fixed seat; 31. first fixed shaft; 32. connecting plate; 33. cylinder; 34. second fixed seat; 35. second fixed shaft; 36. push plate; 37. fixed column; 38. baffle. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] Please see the attached Figure 1 -Attached Figure 5 , an embodiment of the present invention provides a laser marking device for a PCB board appearance inspection system, including a fixing frame 1, the upper surface of the fixing frame 1 is fixedly connected to a first motor 2, an output end of the first motor 2 is fixedly provided with a rotating rod 3, an outer wall of the rotating rod 3 is rotatably connected to the inside of the fixing frame 1, an outer wall of the rotating rod 3 is fixedly connected to a rotating plate 4, an inner part of the rotating plate 4 is fixedly connected to a first rotating shaft 5, an outer wall of the first rotating shaft 5 is rotatably connected to a rotating block 6, an inner part of the rotating block 6 is fixedly connected to a second rotating shaft 7, an outer wall of the second rotating shaft 7 is rotatably connected to a slide plate 8, an upper surface of the slide plate 8 is fixedly connected to a limiting block 9, an inner part of the limiting block 9 is slidably connected to a limiting bar 10, an upper surface of the limiting bar 10 is fixedly connected to the inside of the fixing frame 1, a lower surface of the slide plate 8 is fixedly connected to a connecting plate 11, an outer wall of the connecting plate 11 is slidably connected to the inside of the fixing frame 1, and a buffer component is provided on the outer wall of the connecting plate 11;

[0038] Specifically, the fixing frame 1 plays a fixing role on the first motor 2. The driving action of the first motor 2 can make the rotating rod 3 rotate stably inside the fixing frame 1. The rotating rod 3 plays a fixing role on the rotating plate 4. The first rotating shaft 5 plays a role in connecting the rotating plate 4 and the rotating block 6, which can make the rotating block 6 rotate synchronously through the rotation of the first rotating shaft 5. The second rotating shaft 7 plays a role in connecting the rotating block 6 and the slide 8, thereby making the slide 8 slide through the second rotating shaft 7. The slide 8 plays a fixing role on the limit block 9. The fixing frame 1 plays a fixing role on the limit bar 10. The limit block 9 will slide through the limit bar 10, which can effectively prevent the slide 8 from deflecting during the sliding process. The slide 8 plays a fixing role on the connecting plate 11, which can make the connecting plate 11 slide synchronously with the sliding of the slide 8. By adjusting the distance between the connecting plates 11, PCB boards of different sizes can be used.

[0039] Please see the attached Figure 5 The buffer assembly includes a spring 12, the outer wall of the spring 12 is fixedly connected to the outer wall of the connecting plate 11, and the outer wall of the spring 12 is fixedly connected to the clamping plate 13;

[0040] Specifically, the spring 12 is arranged between the connecting plate 11 and the clamping plate 13. When the clamping plate 13 contacts the PCB board, the spring 12 is squeezed. The buffering effect of the spring 12 can reduce the damage to the PCB board caused by clamping.

[0041] Please see the attached Figure 1 -Attached Figure 3 The upper surface of the fixed frame 1 is fixedly connected to a slide rod 14, the outer wall of the slide rod 14 is slidably connected to a slider 15, the inner part of the slider 15 is slidably connected to a limit plate 16, and the outer wall of the limit plate 16 is fixedly connected to a bracket 17;

[0042] Specifically, the fixing frame 1 fixes the sliding rod 14, and the slider 15 supports and limits the sliding of the sliding rod 14. The slider 15 will also be pushed by the sliding action of the sliding rod 14. The limiting plate 16 is fixed on the outer wall of the bracket 17 to limit the sliding of the slider 15 and prevent displacement during the sliding process.

[0043] Please see the attached Figure 1 -Attached Figure 3 The outer wall of the bracket 17 is fixedly connected to the second motor 18, the output end of the second motor 18 is fixedly provided with a first connecting shaft 19, and the outer wall of the first connecting shaft 19 is rotatably connected to the inside of the bracket 17;

[0044] Specifically, the bracket 17 plays a role in fixing the second motor 18 , and the first connecting shaft 19 can be stably rotated inside the bracket 17 through the driving action of the second motor 18 .

[0045] Please see the attached Figure 1 -Attached Figure 3The outer wall of the first connecting shaft 19 is fixedly connected to the connecting plate 20, the interior of the connecting plate 20 is rotatably connected to the second connecting shaft 21, and the outer wall of the second connecting shaft 21 is fixedly connected to the interior of the sliding rod 14;

[0046] Specifically, the connecting plate 20 can be rotated synchronously through the transmission effect of the first connecting shaft 19, and the second connecting shaft 21 serves to connect the slide rod 14 and the connecting plate 20, so that the slide rod 14 can slide stably inside the slider 15 through the rotation of the second connecting shaft 21. The PCB board can be moved from the initial position to the engraving position through the fixing frame 1 through the slide rod 14, ensuring that the PCB board transferred each time is in the same position, thereby ensuring the engraving accuracy.

[0047] Please see the attached Figure 1 -Attached Figure 2 The lower surface of the bracket 17 is fixedly connected to a base 22, an upper surface of the base 22 is provided with an engraving mechanism 23, an upper surface of the base 22 is provided with a detection mechanism 24, an outer wall of the base 22 is fixedly connected to a third motor 25, an output end of the third motor 25 is fixedly provided with a conveyor belt 26, and the outer wall of the conveyor belt 26 is rotatably connected to the interior of the base 22;

[0048] Specifically, the base 22 fixes the bracket 17, and the PCB board can be laser engraved through the engraving mechanism 23 set on the upper surface of the base 22. The base 22 fixes the third motor 25, and the driving action of the third motor 25 enables the conveyor belt 26 to transport and inspect the PCB board.

[0049] Please see the attached Figure 2 -Attached Figure 7 The outer wall of the base 22 is fixedly connected to a connecting frame 27, the interior of the connecting frame 27 is fixedly connected to a classification frame 28, the interior of the connecting frame 27 is fixedly connected to a connecting block 29, the outer wall of the connecting block 29 is fixedly connected to a first fixing seat 30, and the interior of the first fixing seat 30 is rotatably connected to a first fixed shaft 31;

[0050] Specifically, the base 22 fixes the connecting frame 27, and the connecting frame 27 fixes the classification frame 28. The inclined design of the classification frame 28 facilitates the discharge of PCBs, and the classification frame 28 also facilitates the classification and discharge of different PCBs. The connecting block 29 is fixed inside the connecting frame 27 to fix the first fixing seat 30, and the first fixing seat 30 supports the first fixed shaft 31.

[0051] Please see the attached Figure 6 -Attached Figure 7The outer wall of the first fixed shaft 31 is fixedly connected to a connecting piece 32, the outer wall of the connecting piece 32 is fixedly connected to a cylinder 33, the output end of the cylinder 33 is fixedly provided with a second fixing seat 34, the interior of the second fixing seat 34 is fixedly connected to a second fixed shaft 35, and the outer wall of the second fixed shaft 35 is slidably connected to a push plate 36;

[0052] Specifically, the connecting piece 32 is fixed to the outer wall of the first fixed shaft 31 to fix the cylinder 33. By starting the cylinder 33, the second fixed seat 34 can be pushed to slide. During the start-up process of the cylinder 33, the first fixed shaft 31 will also be driven to rotate inside the first fixed seat 30 through the connecting piece 32. The second fixed seat 34 fixes the second fixed shaft 35, allowing the second fixed shaft 35 to slide synchronously with the sliding of the second fixed seat 34, and then the second fixed shaft 35 can slide on the inner wall of the push plate 36. At the same time, the push plate 36 will also rotate due to the sliding of the second fixed shaft 35.

[0053] Please see the attached Figure 6 -Attached Figure 7 The interior of the push plate 36 is fixedly connected to a fixed column 37, the outer wall of the fixed column 37 is rotatably connected to the interior of the classification frame 28, the outer wall of the fixed column 37 is fixedly connected to a baffle 38, and the outer wall of the baffle 38 is slidably connected to the inner wall of the classification frame 28;

[0054] Specifically, the push plate 36 fixes the fixed column 37, so that the fixed column 37 can stably rotate inside the classification frame 28 as the push plate 36 rotates. The fixed column 37 fixes the baffle 38, thereby causing the baffle 38 to rotate synchronously. The baffle 38 plays a role in diverting the PCB boards. By rotating the baffle 38 on both sides of the classification frame 28, qualified and unqualified PCB boards can be automatically classified.

[0055] Please see the attached Figure 1 -Attached Figure 8 A method for using a laser marking device in a PCB board appearance inspection system, the method comprising the following steps:

[0056] S1, adjust the distance between the clamps 13 to fix PCB boards of different sizes;

[0057] S2, the PCB board is clamped and transferred to the position of the engraving mechanism 23;

[0058] S3, after the engraving is completed, it is transported to the detection mechanism 24 via the conveyor belt 26;

[0059] S4, the detection mechanism 24 sends the detection results to the control system, and the control system controls the position of the baffle 38 according to different detection results to sort the PCB boards;

[0060] Specifically, the distance between the clamps 13 is flexibly adjusted according to different PCB sizes. The control system controls the start of the first motor 2 to clamp and fix the PCB board. Then the control system controls the start of the second motor. The PCB board can be automatically transferred from the initial position to the engraving position by shifting the position of the slide bar 14. The control system controls the engraving mechanism 23 to engrave the PCB board, and the laser-engraved PCB board is transported to the detection mechanism 24. The detection mechanism 24 transmits the detection information to the control system, and the control system controls the cylinder 33 to adjust the position of the baffle 38, so that different PCB boards can be sorted.

[0061] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A laser marking device for a PCB appearance inspection system, comprising a fixing frame (1), characterized in that: The upper surface of the fixed frame (1) is fixedly connected to a first motor (2), an output end of the first motor (2) is fixedly provided with a rotating rod (3), an outer wall of the rotating rod (3) is rotatably connected to the inside of the fixed frame (1), an outer wall of the rotating rod (3) is fixedly connected to a rotating plate (4), an inner part of the rotating plate (4) is fixedly connected to a first rotating shaft (5), an outer wall of the first rotating shaft (5) is rotatably connected to a rotating block (6), an inner part of the rotating block (6) is fixedly connected to a second rotating shaft (7), an outer wall of the second rotating shaft (7) is rotatably connected to a slide plate (8), an upper surface of the slide plate (8) is fixedly connected to a limiting block (9), an inner part of the limiting block (9) is slidably connected to a limiting strip (10), an upper surface of the limiting strip (10) is fixedly connected to the inside of the fixed frame (1), a lower surface of the slide plate (8) is fixedly connected to a connecting plate (11), an outer wall of the connecting plate (11) is slidably connected to the inside of the fixed frame (1), and a buffer assembly is provided on the outer wall of the connecting plate (11).

2. The laser marking device of the PCB appearance inspection system according to claim 1, characterized in that: The buffer assembly comprises a spring (12), the outer wall of the spring (12) is fixedly connected to the outer wall of the connecting plate (11), and the outer wall of the spring (12) is fixedly connected to a clamping plate (13).

3. The laser marking device of the PCB appearance inspection system according to claim 1, characterized in that: The upper surface of the fixed frame (1) is fixedly connected to a slide bar (14), the outer wall of the slide bar (14) is slidably connected to a slider (15), the interior of the slider (15) is slidably connected to a limit plate (16), and the outer wall of the limit plate (16) is fixedly connected to a bracket (17).

4. The laser marking device of the PCB appearance inspection system according to claim 3, characterized in that: The outer wall of the bracket (17) is fixedly connected to a second motor (18), an output end of the second motor (18) is fixedly provided with a first connecting shaft (19), and the outer wall of the first connecting shaft (19) is rotatably connected to the interior of the bracket (17).

5. The laser marking device of the PCB appearance inspection system according to claim 4, characterized in that: The outer wall of the first connecting shaft (19) is fixedly connected to a connecting plate (20), the interior of the connecting plate (20) is rotatably connected to a second connecting shaft (21), and the outer wall of the second connecting shaft (21) is fixedly connected to the interior of the sliding rod (14).

6. The laser marking device of the PCB appearance inspection system according to claim 3, characterized in that: The lower surface of the bracket (17) is fixedly connected to a base (22), the upper surface of the base (22) is provided with an engraving mechanism (23), the upper surface of the base (22) is provided with a detection mechanism (24), the outer wall of the base (22) is fixedly connected to a third motor (25), the output end of the third motor (25) is fixedly provided with a conveyor belt (26), and the outer wall of the conveyor belt (26) is rotatably connected to the interior of the base (22).

7. The laser marking device of the PCB appearance inspection system according to claim 6, characterized in that: The outer wall of the base (22) is fixedly connected to a connecting frame (27), the interior of the connecting frame (27) is fixedly connected to a classification frame (28), the interior of the connecting frame (27) is fixedly connected to a connecting block (29), the outer wall of the connecting block (29) is fixedly connected to a first fixing seat (30), and the interior of the first fixing seat (30) is rotatably connected to a first fixed shaft (31).

8. The laser marking device of the PCB appearance inspection system according to claim 7, characterized in that: The outer wall of the first fixed shaft (31) is fixedly connected to a connecting piece (32), the outer wall of the connecting piece (32) is fixedly connected to a cylinder (33), the output end of the cylinder (33) is fixedly provided with a second fixed seat (34), the interior of the second fixed seat (34) is fixedly connected to a second fixed shaft (35), and the outer wall of the second fixed shaft (35) is slidably connected to a push plate (36).

9. The laser marking device of the PCB appearance inspection system according to claim 8, characterized in that: The push plate (36) is fixedly connected to a fixed column (37) inside, and the outer wall of the fixed column (37) is rotatably connected to the inside of the classification frame (28). The outer wall of the fixed column (37) is fixedly connected to a baffle (38), and the outer wall of the baffle (38) is slidably connected to the inner wall of the classification frame (28).

10. A method for using a laser marking device in a PCB board appearance inspection system, characterized in that: A laser marking device for a PCB appearance inspection system according to any one of claims 1 to 9, wherein the method comprises the following steps: S1, adjusting the distance between the clamping plates (13) to fix PCB boards of different sizes; S2, the PCB board is clamped and transferred to the position of the engraving mechanism (23); S3, after the engraving is completed, it is transported to the detection mechanism (24) via the conveyor belt (26); S4. The detection mechanism (24) sends the detection results to the control system, and the control system controls the position of the baffle (38) to sort the PCB boards according to different detection results.

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