PCB appearance detection marking equipment

Abstract

The invention belongs to the technical field of PCB production and manufacturing, particularly relates to PCB appearance detection marking equipment, and aims to solve the problems that the identification of a detection camera is possibly influenced and the identification result of the detection camera is mistaken due to irradiation light spots on the surface of a PCB during detection, so that the equipment marks a defective part by mistake or lacks marks, and the qualified rate of subsequent PCB finished products is influenced. According to the scheme, the device comprises a device rack, two installation platforms are arranged in the device rack, and two movement Y-axis guide bases are arranged on the installation platforms. The PCB appearance detection marking equipment disclosed by the invention has the effect of improving the accuracy of PCB appearance detection marking, and when the appearance detection of the PCB is carried out, the device can carry out external illumination shielding on the detection part of the detection camera body, so that the external illumination is prevented from directly irradiating the detection part to form light spots, the identification result error of the detection camera is further avoided, and the detection accuracy of the PCB is improved. And the equipment is ensured not to carry out wrong marking or missing marking on the defective part, so that the qualified rate of PCB finished products is improved.

Description

Technical Field

[0001] This invention relates to the field of PCB manufacturing technology, and in particular to a PCB appearance inspection and marking device. Background Technology

[0002] PCB, short for Printed Circuit Board, is a crucial basic component in the electronics industry. Through predetermined circuit design, it forms conductive copper traces on an insulating substrate to connect and support various electronic components (such as chips, resistors, capacitors, etc.) to form a complete working circuit. Almost all electronic devices rely on PCBs, hence it is often referred to as the "mother of electronic products."

[0003] PCB appearance inspection is a key quality control link in electronic product manufacturing. Its main purpose is to promptly identify and remove printed circuit boards with surface defects before assembly and shipment, ensuring the reliability, functionality and yield of the final product. In short, the ultimate goal of PCB appearance inspection is to establish a reliable "quality firewall" at the very beginning of the manufacturing chain. It is not just about "finding faults", but a core link that is preventive, economical and process control.

[0004] Existing PCBs typically use inspection cameras to identify surface defects during visual inspection and marking. However, during inspection and marking, light from the external environment may enter the equipment, causing light spots on the PCB surface. This can affect the inspection camera's recognition, leading to errors in the camera's results. Consequently, the equipment may mismark or miss marking defective areas, affecting the subsequent PCB product pass rate. Summary of the Invention

[0005] This invention discloses a PCB appearance inspection and marking device, which aims to solve the technical problem in the background art where illumination spots appear on the PCB surface during inspection, which may affect the recognition of the inspection camera, leading to errors in the recognition results of the inspection camera, and consequently causing the device to mismark or miss marking defective parts, thus affecting the subsequent finished product qualification rate of the PCB.

[0006] The present invention proposes a PCB appearance inspection and marking device, comprising: The equipment frame has two mounting platforms inside, and each mounting platform is equipped with two motion Y-axis guides. A lifting mechanism is mounted on an installation platform and located between two motion Y-axis guide seats. The lifting mechanism is equipped with a vacuum platform and a conveyor belt mechanism. A connecting roller assembly is mounted on an installation platform, and the connecting roller assembly is located on one side of the vacuum platform; The feeding mechanism is located inside the equipment frame; A flip module is installed inside the equipment frame, and the flip module is located between two mounting platforms; A marking and stamping module is set on two moving Y-axis guides. A moving X-axis guide is also set on the two moving Y-axis guides. A detection camera body is set on the moving X-axis guide. A light-blocking unit is installed on the camera body. The light-blocking unit includes a light-blocking cover and a soft base cover, with the soft base cover located below the light-blocking cover. The detection and cleaning module is mounted on the detection camera body and includes a follow-up frame and two cleaning chambers.

[0007] In a preferred embodiment, the detection shading unit further includes: Two fixed brackets are provided, both of which are mounted on the detection camera body, and the two fixed brackets are provided with the same mounting shaft. A flipping link is mounted on a mounting shaft and located between two fixed supports. A fixed ring plate is provided on the flipping link.

[0008] In a preferred embodiment, the detection shading unit further includes: A servo motor is mounted on one of the fixed brackets, and the output shaft of the servo motor is connected to one end of the mounting shaft via a coupling. Contact pad ring, the contact pad ring is set on the fixed ring plate; Multiple telescopic springs are provided, all of which are mounted on a fixed ring plate. One end of each of the multiple telescopic springs is provided with the same lifting ring seat. A light-shielding cover is provided on the fixed ring plate and the lifting ring seat, and a soft bottom cover is provided on the lifting ring seat.

[0009] In a preferred embodiment, the detection shading unit further includes: Two mounting brackets are provided, both of which are mounted on a fixed ring plate. Each of the two mounting brackets is equipped with a shaft, and each of the two shafts is equipped with a wire harness reel. Two connecting wire harnesses are respectively set on two wire harness reels.

[0010] In a preferred embodiment, the detection shading unit further includes: Two general-purpose motors are respectively mounted on two mounting brackets, and the output shafts of the two general-purpose motors are respectively connected to one end of two shaft members through couplings; Two connecting support plates are provided, both of which are mounted on the lifting ring seat, and one end of each of the two connecting wire harnesses is mounted on the two connecting support plates respectively.

[0011] In a preferred embodiment, the detection shading unit further includes: Multiple support components are provided on the lifting ring seat, and each of the multiple lifting ring seats is provided with a contact ball seat, which is located inside the soft base cover. Multiple contact balls are disposed inside multiple contact ball seats.

[0012] In a preferred embodiment, the detection shading unit further includes: A fixing ring frame is disposed on a fixing ring plate, and the fixing ring frame is located inside the light-shielding sleeve. The inner ring light is mounted on a fixed ring frame.

[0013] In a preferred embodiment, the detection and cleaning module further includes: Two limiting guide rails are provided, both of which are mounted on the motion X-axis guide seat, and the follower frame is mounted on the two limiting guide rails; Two fixing holes are provided on the follow-up frame and the detection camera body, and fixing bolts are provided inside the two fixing holes.

[0014] In a preferred embodiment, the detection and cleaning module further includes: A fixed frame is mounted on a follower frame. A dust filter bag compartment is mounted on the fixed frame, and an openable cover is mounted on the dust filter bag compartment. The cleaning pump is installed on the dust filter bag compartment.

[0015] In a preferred embodiment, the detection and cleaning module further includes: Two connecting pipes are provided on the dust filter bag compartment, and two cleaning chambers are respectively provided at one end of the two connecting pipes. Multiple cleaning holes are provided on each of the two cleaning chambers. Two control valves are installed on two connecting pipes respectively.

[0016] As can be seen from the above, the PCB appearance inspection and marking device provided by the present invention has the function of improving the accuracy of PCB appearance inspection and marking. When performing PCB appearance inspection, the device can block the external light on the inspection part of the inspection camera body to avoid the external light shining directly on the inspection part and forming light spots, thereby avoiding errors in the recognition results of the inspection camera and ensuring that the device will not mismark or miss marking defective parts, so as to improve the PCB finished product qualification rate. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a PCB appearance inspection and marking device proposed in this invention; Figure 2 This is a schematic diagram of the overall internal structure of a PCB appearance inspection and marking device proposed in this invention; Figure 3 This is a schematic diagram of the combined structure of the motion Y-axis guide and the motion X-axis guide of the PCB appearance inspection and marking device proposed in this invention; Figure 4 This is a schematic diagram of the combined structure of the inspection camera body and the motion X-axis guide of the PCB appearance inspection and marking device proposed in this invention; Figure 5 This is a schematic diagram of the detection light-shielding unit structure of a PCB appearance inspection and marking device proposed in this invention; Figure 6 This is a schematic diagram of the combined structure of a light-shielding cover and a soft base cover for a PCB appearance inspection and marking device proposed in this invention. Figure 7 This is a schematic diagram of the mounting bracket and connecting support plate combination structure of a PCB appearance inspection and marking device proposed in this invention; Figure 8 This is a schematic diagram of the combined structure of the lifting ring seat and the fixed ring plate of the PCB appearance inspection and marking device proposed in this invention; Figure 9 This is a schematic diagram of the detection and cleaning module structure of a PCB appearance inspection and marking device proposed in this invention; Figure 10 This is a schematic diagram of the combined structure of the dust filter bag chamber and the cleaning chamber of a PCB appearance inspection and marking device proposed in this invention.

[0018] In the diagram: 1. Equipment frame; 2. Mounting platform; 3. Motion Y-axis guide seat; 4. Lifting mechanism; 5. Connecting roller assembly; 6. Conveyor belt mechanism; 7. Vacuum platform; 8. Tilting module; 9. Marking and stamping module; 10. Feeding mechanism; 11. Detection and light-shielding unit; 1101. Fixed bracket; 1102. Tilting linkage; 1103. Light-shielding cover; 1104. Mounting shaft; 1105. General-purpose motor; 1106. Telescopic spring; 1107. Soft base cover; 1108. Servo motor; 1109. Contact pad ring; 1110. Shaft component; 1111. Mounting bracket; 1112. Connecting support plate; 1113. Connecting wire harness; 11 14. Wire harness reel; 1115. Fixing ring frame; 1116. Inner surround light; 1117. Contact ball seat; 1118. Support component; 1119. Contact ball; 1120. Lifting ring seat; 1121. Fixing ring plate; 12. Detection camera body; 13. Motion X-axis guide seat; 14. Detection and cleaning module; 1401. Limiting guide rail; 1402. Fixing hole; 1403. Follow-up frame; 1404. Dust filter bag compartment; 1405. Fixing bolt; 1406. Connecting pipe; 1407. Cleaning chamber; 1408. Cleaning hole; 1409. Control valve; 1410. Fixing frame; 1411. Opening and closing cover plate; 1412. Cleaning pump. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] The PCB appearance inspection and marking device disclosed in this invention is mainly used in scenarios where there are irradiation spots on the PCB surface during inspection, which may affect the recognition of the inspection camera, leading to errors in the recognition results of the inspection camera, and consequently causing the device to mis-mark or miss-mark defective parts, affecting the subsequent finished product qualification rate of the PCB.

[0021] Reference Figures 1-10 A PCB appearance inspection and marking device, comprising: The equipment frame 1 has two mounting platforms 2 inside, and two motion Y-axis guides 3 are installed on the mounting platforms 2. Lifting mechanism 4 is set on the installation platform 2. The lifting mechanism 4 is located between two motion Y-axis guide seats 3. A vacuum platform 7 and a conveyor belt mechanism 6 are set on the lifting mechanism 4. The connecting roller assembly 5 is mounted on the mounting platform 2 and is located on one side of the vacuum platform 7. The feeding mechanism 10 is located inside the equipment frame 1; The flip module 8 is installed inside the equipment frame 1 and is located between the two mounting platforms 2. A marking and stamping module 9 is set on two moving Y-axis guides 3. A moving X-axis guide 13 is also set on the two moving Y-axis guides 3. A detection camera body 12 is set on the moving X-axis guide 13. The detection light-blocking unit 11 is disposed on the detection camera body 12. The detection light-blocking unit 11 includes a light-blocking cover 1103 and a soft base cover 1107, with the soft base cover 1107 located below the light-blocking cover 1103. The detection and cleaning module 14 is mounted on the detection camera body 12. The detection and cleaning module 14 includes a follow-up frame 1403 and two cleaning chambers 1407.

[0022] It should be noted that the flip module 8 can be flipped when the PCB is marked for appearance inspection, so as to flip and change the A side and B side of the PCB, so that the device can perform double-sided inspection on the A and B sides, and the A and B sides are operated independently. However, in the case where only single-sided inspection is required, the device can be used as two devices to perform single-sided inspection on two PCBs at the same time. When inspecting the PCB board through the inspection camera body 12, the device introduces AI algorithms to detect appearance defects. By continuously updating the defect judgment standard database, the intelligence and accuracy of PCB inspection are improved. In addition, after the inspection is completed, the defective parts can be marked and stamped by the marking and stamping module 9, which facilitates the location of the defects by the subsequent manual repair process personnel.

[0023] Reference Figures 3-8 In a preferred embodiment, the light-blocking detection unit 11 further includes: Two fixed brackets 1101 are both mounted on the detection camera body 12, and the same mounting shaft 1104 is provided on the two fixed brackets 1101. A flipping link 1102 is mounted on a mounting shaft 1104 and located between two fixed supports 1101. A fixed ring plate 1121 is provided on the flipping link 1102.

[0024] In this invention, the light-blocking detection unit 11 further includes: Servo motor 1108 is mounted on one of the fixed brackets 1101. The output shaft of servo motor 1108 is connected to one end of mounting shaft 1104 via a coupling. Contact pad ring 1109, the contact pad ring 1109 is disposed on the fixing ring plate 1121; Multiple telescopic springs 1106 are provided on the fixed ring plate 1121. One end of each of the multiple telescopic springs 1106 is provided with the same lifting ring seat 1120. A light-shielding cover 1103 is provided on the fixed ring plate 1121 and the lifting ring seat 1120. A soft bottom cover 1107 is provided on the lifting ring seat 1120.

[0025] In this invention, the light-blocking detection unit 11 further includes: Two mounting brackets 1111 are both mounted on the fixing ring plate 1121. Each of the two mounting brackets 1111 is equipped with a shaft member 1110, and each of the two shaft members 1110 is equipped with a wire harness reel 1114. Two connecting wire harnesses 1113 are respectively mounted on two wire harness reels 1114.

[0026] In this invention, the light-blocking detection unit 11 further includes: Two general-purpose motors 1105 are respectively mounted on two mounting brackets 1111, and the output shafts of the two general-purpose motors 1105 are respectively connected to one end of two shaft members 1110 through couplings. Two connecting support plates 1112 are both mounted on the lifting ring seat 1120, and one end of each of the two connecting wire harnesses 1113 is mounted on the two connecting support plates 1112 respectively.

[0027] In this invention, the light-blocking detection unit 11 further includes: Multiple support components 1118 are provided on the lifting ring seat 1120. Multiple lifting ring seats 1120 are provided with contact ball seats 1117. Multiple contact ball seats 1117 are located inside the soft base cover 1107. Multiple contact balls 1119 are respectively disposed inside multiple contact ball seats 1117.

[0028] In this invention, the light-blocking detection unit 11 further includes: The fixing ring frame 1115 is disposed on the fixing ring plate 1121 and is located inside the light shield 1103; The inner ring light 1116 is mounted on the fixed ring frame 1115.

[0029] Specifically, during testing, the servo motor 1108 operates, driving the mounting shaft 1104 and the flipping connecting rod 1102 to rotate. This, in turn, causes the fixing ring plate 1121 to move via the flipping connecting rod 1102 until the fixing ring plate 1121 causes the contact pad ring 1109 to contact the bottom of the testing camera body 12. Afterwards, the general-purpose motor 1105 operates, driving the shaft 1110 and the wire harness reel 1114 to rotate. This allows the wire harness reel 1114 to loosen the connecting wire harness 1113, thereby cooperating with the extension... The spring 1106 adjusts the distance between the lifting ring seat 1120 and the fixed ring plate 1121 to accommodate PCBs of different thicknesses. At this time, the lifting ring seat 1120 drives the bracket 1118, the contact ball seat 1117 and the contact ball 1119 to descend until the contact ball 1119 and the soft base cover 1107 contact the PCB to block external light from the inspection area of ​​the inspection camera body 12. Then the internal ring lamp 1116 inside the device is activated to provide internal illumination with appropriate intensity, thereby performing PCB appearance inspection until the inspection is completed. In specific application scenarios, the detection light shielding unit 11 is suitable for the PCB appearance defect detection process. That is, the detection light shielding unit 11 can block the external light on the detection area of ​​the detection camera body 12 through the light shielding cover 1103 and the soft base cover 1107 during the detection process. This prevents the external light from directly shining on the detection area of ​​the PCB and forming light spots, thereby preventing the light spots from affecting the detection of the detection camera body 12. This ensures that the recognition results of the detection camera body 12 will not be erroneous, and further ensures that the equipment will not mis-mark or miss-mark defective areas, thereby improving the accuracy of PCB appearance inspection marking and increasing the PCB finished product qualification rate. It should be noted that when performing PCB appearance inspection marking, the light shield 1103 can be folded and extended to cooperate with the connecting wire harness 1113, the telescopic spring 1106 and other structures to change the height of the lifting ring seat 1120, thereby adapting to the appearance inspection of PCBs of different thicknesses and increasing the applicability of the device. As the PCB appearance inspection is carried out, the inspection camera body 12 can drive the inspection light-shielding unit 11 to move synchronously. At this time, the contact ball 1119 can reduce the friction between the device and the PCB surface during movement, thus preventing the PCB from being worn.

[0030] Reference Figure 4 , Figure 5 , Figure 9 and Figure 10 In a preferred embodiment, the detection and cleaning module 14 further includes: Two limiting guide rails 1401 are both set on the motion X-axis guide seat 13, and the follower frame 1403 is set on the two limiting guide rails 1401. Two fixing holes 1402 are provided on the follower frame 1403 and the detection camera body 12, and fixing bolts 1405 are provided inside the two fixing holes 1402.

[0031] In this invention, the detection and cleaning module 14 further includes: A fixed frame 1410 is mounted on a follower frame 1403. A dust filter bag chamber 1404 is mounted on the fixed frame 1410, and an opening and closing cover plate 1411 is mounted on the dust filter bag chamber 1404. Cleaning pump 1412 is installed on the dust filter bag chamber 1404.

[0032] In this invention, the detection and cleaning module 14 further includes: Two connecting pipes 1406 are provided on the dust filter bag chamber 1404. Two cleaning chambers 1407 are respectively provided at one end of the two connecting pipes 1406. Multiple cleaning holes 1408 are provided on each of the two cleaning chambers 1407. Two control valves 1409 are respectively installed on two connecting pipes 1406.

[0033] Specifically, during the testing process, the cleaning pump 1412 operates, expels the gas inside the dust filter bag chamber 1404 to create a negative pressure state inside, which in turn causes the dust filter bag chamber 1404, in conjunction with the connecting pipe 1406, to also create a negative pressure state inside the cleaning chamber 1407 for cleaning dust on the PCB surface. During cleaning, the device opens one side of the control valve 1409 and closes the other side of the control valve 1409 according to the movement direction of the testing camera body 12, to ensure that only the cleaning chamber 1407 is used during cleaning, thereby improving its cleaning effect until the testing is completed. After the test is completed, the opening and closing cover 1411 can be opened and closed to centrally clean the dust inside the dust filter bag chamber 1404. In specific application scenarios, the inspection and cleaning module 14 is suitable for the PCB appearance defect inspection process. That is, the inspection and cleaning module 14 can clean the PCB surface before the PCB passes through the inspection camera body 12 for inspection, so as to avoid the inspection camera body 12 making misjudgments due to dust residue on the PCB surface during appearance inspection, thereby further improving its inspection accuracy during PCB appearance inspection. At the same time, when the device moves with the inspection camera body 12, the limiting guide rail 1401 can reduce the vibration generated during the operation of the device and improve the stability of the device. It should be noted that during the detection movement, the device can move synchronously with the movement of the detection camera body 12 to clean the PCB parts to be inspected on the detection path in real time, further increasing the effectiveness of the device. In addition, the device can switch the control valve 1409 according to the direction of movement to ensure that the single cleaning chamber 1407 is activated during cleaning, thereby improving its cleaning effect. The dust filter bag compartment 1404 can be opened by opening and closing the cover 1411, so that production staff can carry out centralized cleaning of dust after cleaning.

[0034] Working principle: In use, the PCB is placed on the feeding mechanism 10 and fed by the feeding mechanism 10. Then, with the help of the conveyor belt mechanism 6, the PCB is moved to the vacuum platform 7 and fixed. After fixing, the inspection camera body 12, with the help of the motion Y-axis guide 3 and the motion X-axis guide 13, inspects the PCB. After inspection, the marking and stamping module 9, with the help of the motion Y-axis guide 3 and the motion X-axis guide 13, stamps and marks the defective parts of the PCB to complete the appearance inspection and marking operation of the PCB on one side. Then, the PCB is unloaded through the connecting roller group 5 (if double-sided inspection is required, the PCB enters the flipping module 8 after unloading to flip the A and B sides of the PCB and repeat the above operation until the A and B sides of the PCB are inspected). During testing, the servo motor 1108 operates, driving the mounting shaft 1104 and the flipping linkage 1102 to rotate. This, in turn, causes the fixing ring plate 1121 to move via the flipping linkage 1102 until the fixing ring plate 1121 causes the contact pad ring 1109 to contact the bottom of the testing camera body 12. Then, the general-purpose motor 1105 operates, driving the shaft 1110 and the wire harness reel 1114 to rotate. This allows the wire harness reel 1114 to loosen the connecting wire harness 1113, thereby cooperating with the telescopic spring. Spring 1106 adjusts the distance between lifting ring seat 1120 and fixed ring plate 1121 to accommodate PCBs of different thicknesses. At this time, lifting ring seat 1120 drives bracket 1118, contact ball seat 1117 and contact ball 1119 to descend until contact ball 1119 and soft base cover 1107 contact the PCB to block external light from the inspection area of ​​the inspection camera body 12. Then the internal ring lamp 1116 inside the device is activated to provide internal illumination with appropriate intensity, thereby performing PCB appearance inspection until the inspection is completed. During the inspection, the cleaning pump 1412 operates, expels the gas inside the dust filter bag chamber 1404 to create a negative pressure state inside, which in turn causes the dust filter bag chamber 1404, in conjunction with the connecting pipe 1406, to also create a negative pressure state inside the cleaning chamber 1407 for cleaning dust on the PCB surface. During cleaning, the device opens one side of the control valve 1409 and closes the other side of the control valve 1409 according to the movement direction of the inspection camera body 12 to ensure that only the cleaning chamber 1407 is used during cleaning, thereby improving its cleaning effect until the inspection is completed. After the test is completed, the cover 1411 can be opened and closed to centrally clean the dust inside the dust filter bag chamber 1404.

[0035] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A PCB appearance inspection marking apparatus characterized by comprising: The utility model relates to a kind of equipment rack (1), the inside of equipment rack (1) is provided with two installation platforms (2), and the installation platform (2) is provided with two movement Y-axis guide base (3);Lifting mechanism (4) is set on installation platform (2), lifting mechanism (4) is located between two movement Y-axis guide base (3), and the lifting mechanism (4) is provided with vacuum platform (7) and conveying belt mechanism (6);Connection roller group (5) is set on installation platform (2), and the connection roller group (5) is located in one side of vacuum platform (7);Feeding mechanism (10) is set in the inside of equipment rack (1);Turnover module (8) is set in the inside of equipment rack (1), and the turnover module (8) is located between two installation platforms (2);Mark seal module (9) is set on two movement Y-axis guide base (3), and two movement Y-axis guide base (3) are further provided with movement X-axis guide base (13), and movement X-axis guide base (13) is provided with detection camera body (12);Detection light-shield unit (11) is set on detection camera body (12), and the detection light-shield unit (11) includes light-shield cover (1103) and soft bottom cover (1107), and soft bottom cover (1107) is located below light-shield cover (1103);Detection cleaning module (14) is set on detection camera body (12), and the detection cleaning module (14) includes follow-up frame (1403) and two cleaning chambers (1407). The detection light-shield unit (11) further includes: Two fixed supports (1101) are provided on the detection camera body (12), and the same mounting shaft (1104) is provided on the two fixed supports (1101); The turnover connecting rod (1102) is provided on the mounting shaft (1104), and the turnover connecting rod (1102) is located between the two fixed supports (1101), and the fixed ring plate (1121) is provided on the turnover connecting rod (1102). The detection light-shield unit (1108) further includes: The output shaft of the servo motor (1108) is connected to one end of the mounting shaft (1104) through a shaft coupling; The contact pad ring (1109) is provided on the fixed ring plate (1121); The plurality of extension springs (1106) are provided on the fixed ring plate (1121), and one end of the plurality of extension springs (1106) is provided with the same lifting ring seat (1120), the light-shield cover (1103) is provided on the fixed ring plate (1121) and the lifting ring seat (1120), and the soft bottom cover (1107) is provided on the lifting ring seat (1120). The detection light-shield unit (1108) further includes:

2. The PCB appearance inspection marking apparatus according to claim 1, characterized in that, ​ ​ ​ 3. The PCB appearance inspection marking apparatus according to claim 2, wherein ​ ​ ​ ​ 4. The PCB appearance inspection marking apparatus according to claim 3, wherein ​ Two mounting brackets (1111), both mounting brackets (1111) are arranged on the fixed ring plate (1121), and shaft rod pieces (1110) are arranged on the two mounting brackets (1111); both shaft rod pieces (1110) are arranged with wire harness winding wheels (1114); Two connecting wire harnesses (1113) are arranged on the two wire harness winding wheels (1114) respectively.

5. The PCB appearance inspection marking apparatus according to claim 4, wherein The detection shading unit (11) further comprises: Two universal motors (1105) are arranged on the two mounting brackets (1111) respectively, and the output shafts of the two universal motors (1105) are connected with one end of the two shaft rod pieces (1110) through a shaft coupling respectively; Two connecting branch plates (1112) are arranged on the lifting ring seat (1120), and one end of the two connecting wire harnesses (1113) is arranged on the two connecting branch plates (1112) respectively.

6. The PCB appearance inspection marking apparatus according to claim 5, wherein The detection shading unit (11) further comprises: A plurality of bracket pieces (1118) are arranged on the lifting ring seat (1120), and a plurality of contact ball seats (1117) are arranged on the lifting ring seat (1120), and the plurality of contact ball seats (1117) are located in the interior of the soft bottom cover (1107); A plurality of contact rolling balls (1119) are arranged in the plurality of contact ball seats (1117) respectively.

7. The PCB appearance inspection marking apparatus according to claim 6, wherein The detection shading unit (11) further comprises: A fixed ring frame (1115) is arranged on the fixed ring plate (1121), and the fixed ring frame (1115) is located in the interior of the shading cover (1103); An inner ring illuminating lamp (1116) is arranged on the fixed ring frame (1115).

8. The PCB appearance inspection marking apparatus according to claim 1, wherein The detection cleaning module (14) further comprises: Two limiting guide rails (1401) are arranged on the movement X-axis guide seat (13), and the follow-up frame (1403) is arranged on the two limiting guide rails (1401); Two fixed holes (1402) are formed on the follow-up frame (1403) and the detection camera body (12), and a fixed bolt (1405) is arranged in the two fixed holes (1402).

9. The PCB appearance inspection marking apparatus according to claim 8, wherein The detection cleaning module (14) further comprises: A fixed frame (1410) is arranged on the follow-up frame (1403), and a dust filtering cloth bag bin (1404) is arranged on the fixed frame (1410), and an opening and closing cover plate (1411) is arranged on the dust filtering cloth bag bin (1404); A cleaning pump (1412) is arranged on the dust filtering cloth bag bin (1404).

10. The PCB appearance inspection marking apparatus according to claim 9, wherein The detection cleaning module (14) further comprises: Two connecting pipes (1406) are arranged on the dust filter bag bin (1404), two cleaning chambers (1407) are arranged at one end of the two connecting pipes (1406) respectively, and a plurality of cleaning holes (1408) are formed in the two cleaning chambers (1407) respectively; Two control valves (1409) are arranged on the two connecting pipes (1406) respectively.

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