PCB appearance defect detection machine

Abstract

The application discloses a PCB appearance defect detection machine and relates to the field of PCB detection. The PCB appearance defect detection machine comprises a machine body, a preliminary detection unit, a buffer unit, a transportation channel, an OK material channel, a re-detection unit, a turnover unit, a re-detection channel and a mechanical hand unit are arranged in the machine body. The preliminary detection unit is used for the preliminary detection of a PCB, and the buffer unit is used for the temporary storage of NG materials of the PCB. The re-detection unit is fixedly arranged between the turnover unit and the re-detection channel. The PCB appearance defect detection machine can continuously detect the PCB after the re-detection of the PCB, has high detection efficiency, and can temporarily store the NG materials of the PCB by using the buffer unit when the number of NG materials detected in the preliminary detection unit is large, so that the detection efficiency is further improved.

Description

Technical Field

[0001] This invention relates to the field of PCB board inspection technology, specifically to a PCB board appearance defect inspection machine. Background Technology

[0002] PCB defect inspection machines are primarily used to detect circuit quality issues that occur during the printing process on single-layer PCBs without solder mask. They replace the traditional, low-efficiency manual inspection method with a high-precision, high-resolution, and high-efficiency visual recognition system. While ensuring accurate detection of residual copper, micro-short circuits, and micro-open circuits in screen-printed circuits, they minimize false alarms related to offsets, misalignments, and jagged edges in the printed circuitry.

[0003] During the PCB production process, simple inspections are performed on the PCBs. After production is completed, the PCBs are usually marked. This marking is usually done by assigning a code, which marks them as OK or NG based on the QR code. However, because the inspection is relatively rough and the PCBs have not been cleaned, a large portion of the NG PCBs may be marked as NG for other reasons. Therefore, they need to be re-inspected during the formal appearance inspection process, which is quite cumbersome.

[0004] Meanwhile, existing PCB board inspection machines require visual inspection of both sides of the PCB board during the inspection process. Therefore, after the inspection of one side is completed, the board needs to be flipped over to inspect the other side, which requires more inspection time. If there are a large number of defective parts, the defective parts will accumulate and be difficult to store, making it difficult to continue the previous work and thus reducing the inspection efficiency. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a PCB board appearance defect inspection machine. This solves the problem that existing PCB board inspection machines require double-sided appearance inspection of the PCB board during the inspection process. Therefore, after inspecting one side, the board needs to be flipped over for inspection of the other side, which requires more inspection time. If there are many defective parts, they will accumulate and be difficult to store, making it difficult to continue the previous work and thus reducing the inspection efficiency.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a PCB board appearance defect inspection machine, comprising a machine body, wherein the machine body is internally provided with a preliminary inspection unit, a buffer unit, a transport channel, an OK material channel, a re-inspection unit, a flipping unit, a re-inspection channel, and a robotic arm unit;

[0007] The re-inspection unit, flipping unit, and re-inspection channel are located on the side of the preliminary inspection unit, buffer unit, and transport channel, and the robotic arm unit is fixedly installed above the OK material channel and the re-inspection channel.

[0008] The preliminary inspection unit is used for the preliminary inspection of the PCB board. The buffer unit is fixedly installed at the discharge end of the preliminary inspection unit and is used for the temporary storage of NG materials of the PCB board. The transport channel is fixedly installed at the discharge end of the buffer unit and the inlet end of the OK material channel and is used for the transport of the PCB board. The re-inspection unit is fixedly installed between the flipping unit and the re-inspection channel.

[0009] When the preliminary inspection unit detects that the PCB board is OK, the PCB board is transported outward through the OK material channel via the transport channel. When the preliminary inspection unit detects that the PCB board is NG, the PCB board is transferred to the re-inspection unit via the transport channel by the robotic arm unit for re-inspection. The flipping unit, in conjunction with the re-inspection unit, can perform double-sided inspection on the PCB board, and after re-inspection, the PCB board is transported outward through the re-inspection channel.

[0010] Preferably, the preliminary detection unit includes:

[0011] The cleaning rack is fixedly installed inside the machine body. The cleaning rack has a conveyor belt inside, and multiple guides are installed above the conveyor belt. Ultrasonic probes are installed in the guides.

[0012] The barcode scanner is fixedly installed on the side of the cleaning rack.

[0013] Preferably, the cache unit includes:

[0014] A conveyor frame is fixedly connected between the washing frame and the transport channel, and multiple conveying rollers are rotatably arranged inside the conveyor frame;

[0015] The buffer frame is located on the back of the conveyor frame, and a movable frame is slidably arranged on the front of the buffer frame. Multiple buffer bars are fixedly arranged on the front of the movable frame. The multiple buffer bars are arranged vertically in multiple layers, and the multiple buffer bars are respectively located in the gap space between multiple conveyor rollers.

[0016] Preferably, an adjusting motor is fixedly installed on the top of the buffer rack, a lead screw is fixedly installed on the output end of the adjusting motor, a threaded block is threadedly connected to the outer side of the lead screw, and the threaded block is fixedly installed on the back of the movable rack. A guide rod is also fixedly installed inside the buffer rack, a guide block is movably sleeved on the outer side of the guide rod, and the guide block is fixedly installed on the back of the movable rack.

[0017] Preferably, the re-inspection unit includes:

[0018] The base is fixedly installed inside the machine body, and a testing platform is set on top of the base;

[0019] The first guide rail is positioned above the base, and a positioning seat is slidably mounted on the front of the first guide rail. A CCD detection camera assembly is mounted on the front of the positioning seat, and the CCD detection camera assembly is positioned above the detection platform.

[0020] Preferably, a second guide rail is fixedly disposed above the base, a first drive motor is disposed at the end of the second guide rail, and a support bar is slidably disposed above the second guide rail, and the support bar is fixedly disposed at the end of the first guide rail.

[0021] Preferably, the flipping unit includes:

[0022] The first bearing seat and the second bearing seat are both fixedly installed inside the machine body, and a rotating shaft is rotatably installed inside the first bearing seat and the second bearing seat. A flip frame is fixedly connected to the end of the rotating shaft. Multiple conveying shafts are rotatably installed between the flip frames on both sides. The multiple conveying shafts are arranged vertically in two rows. The first positioning wheel and the second positioning wheel are fixedly sleeved on the outer side of the two rows of conveying shafts, respectively.

[0023] The second drive motor is fixedly mounted on the outside of the first bearing housing and is connected to one of the rotating shafts via a transmission.

[0024] Preferably, the robotic arm unit includes:

[0025] A robotic arm mounting frame is fixedly installed above the OK material channel and the re-inspection channel, and a first slide rail is fixedly installed on the outer side of the robotic arm mounting frame, with a first robotic arm motor installed at the end of the first slide rail.

[0026] The adsorption component is slidably disposed on the outside of the first slide rail and is connected to the first robotic arm motor for transmission.

[0027] Preferably, the adsorption component includes:

[0028] The second slide rail is slidably disposed on the outside of the first slide rail, and the end of the second slide rail is provided with a second robotic arm motor;

[0029] The movable frame is slidably mounted on the outside of the second slide rail and is connected to the second robotic arm motor via a drive connection.

[0030] The movable strip is slidably set at the bottom of the movable frame, and multiple suction strips are fixedly set at the bottom of the movable strip, with multiple vacuum suction cups set at the bottom of the multiple suction strips.

[0031] Preferably, a rack is fixedly provided at the bottom of the movable frame, and a third robotic arm motor is fixedly provided at the end of the movable rack. The end of the third robotic arm motor is connected to a gear that meshes with the rack.

[0032] This invention discloses a PCB board appearance defect inspection machine, which has the following beneficial effects:

[0033] 1. In operation, the PCB board appearance defect inspection machine first places the PCB board into the preliminary inspection unit, which performs ultrasonic cleaning on the surface of the PCB board. After cleaning, it is then scanned for inspection. When the PCB board is detected as OK, it enters the OK material channel through the transport channel and is then conveyed outwards. When the preliminary inspection unit detects that the PCB board is NG, it is transferred to the re-inspection unit through the transport channel by the robotic arm unit for re-inspection. The flipping unit, in conjunction with the re-inspection unit, can perform double-sided inspection of the PCB board. After re-inspection, the PCB board enters the re-inspection channel and is conveyed outwards, enabling continuous inspection with high efficiency. Furthermore, if there are many NG materials detected during the preliminary inspection, a buffer unit can temporarily store the NG materials without affecting the OK materials from entering the OK material channel through the transport channel, further improving inspection efficiency.

[0034] 2. In this PCB board appearance defect inspection machine, after preliminary inspection, the PCB board is first transferred to the conveyor frame in the buffer unit, so that the PCB board is in contact with multiple conveyor rollers in the conveyor frame. When the re-inspection unit is inspecting the NG material of the PCB board, and there is also NG material of the PCB board above the multiple conveyor rollers, the adjustment motor is turned on. The lead screw at its output end, together with the guide rod, can drive the threaded block and the movable frame to move vertically. The multiple buffer bars on the front of the movable frame are arranged vertically in multiple layers, and the multiple buffer bars are located in the gap space between the multiple conveyor rollers. Therefore, when the multiple buffer bars move vertically, they can lift the NG material of the PCB board above the multiple conveyor rollers, and thus buffer the NG material of the PCB board above it, so as to prevent the preliminary inspection unit from being unable to perform the inspection work.

[0035] 3. When the other side of the PCB board defect inspection machine needs to be inspected, the PCB board defect is fed between the first positioning wheel and the second positioning wheel. Then, the second drive motor drives one of the rotating shafts to rotate, which causes the flipping frames on both sides to rotate. This flips the PCB board defect between the first positioning wheel and the second positioning wheel. The flipped PCB board defect then enters the re-inspection unit for inspection of the other side until the re-inspection is completed. The PCB board defect then enters the re-inspection channel and is moved outward. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the structure of the present invention;

[0038] Figure 2 This is a schematic diagram of the internal structure of the body of the present invention;

[0039] Figure 3 This is a schematic diagram of the preliminary detection unit, buffer unit, transport channel, and OK material channel of the present invention;

[0040] Figure 4 This is a schematic diagram of the preliminary detection unit of the present invention;

[0041] Figure 5 This is a schematic diagram of the structure of the cache unit of the present invention;

[0042] Figure 6 This is a schematic diagram of the structure of the re-inspection unit and the flipping unit of the present invention;

[0043] Figure 7 This is a schematic diagram of the re-inspection unit of the present invention;

[0044] Figure 8 This is a schematic diagram of the structure of the flipping unit of the present invention;

[0045] Figure 9 This is a schematic diagram of the structure of the robotic arm unit of the present invention;

[0046] Figure 10 This is a schematic diagram of the adsorption component of the present invention.

[0047] In the diagram: 1. Machine body; 2. Preliminary inspection unit; 21. Cleaning rack; 22. Conveyor belt; 23. Guide component; 24. Barcode scanner; 3. Buffer unit; 31. Conveyor rack; 32. Conveyor roller; 33. Buffer rack; 34. Movable rack; 35. Buffer bar; 36. Adjusting motor; 37. Guide rod; 4. Transport channel; 5. OK material channel; 6. Re-inspection unit; 61. Base; 62. Inspection platform; 63. First guide rail; 64. Positioning seat; 65. CCD inspection camera assembly; 66. Second guide rail; 67. First drive motor; 7. Flipping unit; 71. First bearing seat; 72. Second bearing seat; 73. Flipping frame; 74. Second drive motor; 75. First positioning wheel; 76. Second positioning wheel; 8. Re-inspection channel; 9. Robotic arm unit; 91. Robotic arm mounting frame; 92. First slide rail; 93. First robotic arm motor; 94. Adsorption assembly; 941. Second slide rail; 942. Second robotic arm motor; 943. Moving frame; 944. Moving bar; 945. Rack; 946. Third robotic arm motor; 947. Adsorption bar; 948. Vacuum suction cup. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] This application provides a PCB board appearance defect inspection machine, which solves the problem that existing PCB board inspection machines require double-sided appearance inspection during the inspection process. This necessitates flipping the PCB after single-sided inspection for the other side, resulting in longer inspection time. Furthermore, if the number of defective parts is large, the accumulation of defective parts makes storage difficult, hindering the continuous execution of previous steps and reducing inspection efficiency. The flipping unit 7, in conjunction with the re-inspection unit 6, enables double-sided inspection of the PCB board. After re-inspection, the PCB board enters the re-inspection channel 8 for outward transport, allowing for continuous inspection with high efficiency. Additionally, if a large number of defective parts are detected during the initial inspection unit 2, the buffer unit 3 can temporarily store the defective parts without affecting the passage of acceptable parts through the transport channel 4 into the acceptable part channel 5, further improving inspection efficiency.

[0050] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0051] This invention discloses a PCB board appearance defect inspection machine.

[0052] According to the appendix Figure 1-10 As shown, the machine includes a body 1, and the interior of the body 1 is equipped with a preliminary detection unit 2, a buffer unit 3, a transport channel 4, an OK material channel 5, a re-inspection unit 6, a flipping unit 7, a re-inspection channel 8, and a robotic arm unit 9.

[0053] The re-inspection unit 6, the flipping unit 7, and the re-inspection channel 8 are located on the sides of the preliminary inspection unit 2, the buffer unit 3, and the transport channel 4, and the robotic arm unit 9 is fixedly installed above the OK material channel 5 and the re-inspection channel 8.

[0054] The preliminary inspection unit 2 is used for the preliminary inspection of the PCB board. The buffer unit 3 is fixedly installed at the discharge end of the preliminary inspection unit 2 and is used for the temporary storage of NG materials of the PCB board. The transport channel 4 is fixedly installed at the discharge end of the buffer unit 3 and the inlet end of the OK material channel 5 and is used for the transport of the PCB board. The re-inspection unit 6 is fixedly installed between the flipping unit 7 and the re-inspection channel 8.

[0055] When the preliminary inspection unit 2 detects that the PCB board is OK, the PCB board is transported outward through the transport channel 4 into the OK material channel 5. When the preliminary inspection unit 2 detects that the PCB board is NG, the PCB board is transferred from the transport channel 4 to the re-inspection unit 6 for re-inspection through the robotic arm unit 9. The flipping unit 7, in conjunction with the re-inspection unit 6, can perform double-sided inspection on the PCB board, and after the re-inspection, the PCB board is transported outward through the re-inspection channel 8.

[0056] During operation, the PCB board is first placed in the preliminary inspection unit 2, where it undergoes ultrasonic cleaning. After cleaning, it is scanned for inspection. When the PCB board is found to be OK, it is transported through the transport channel 4 into the OK material channel 5 and then conveyed outwards. When the preliminary inspection unit 2 detects that the PCB board is NG, it is transferred through the robotic arm unit 9 from the transport channel 4 to the re-inspection unit 6 for re-inspection. The flipping unit 7, in conjunction with the re-inspection unit 6, can perform double-sided inspection on the PCB board. After re-inspection, the PCB board is conveyed outwards through the re-inspection channel 8, enabling continuous inspection with high efficiency. Furthermore, if a large number of NG boards are detected during the preliminary inspection unit 2's inspection, the buffer unit 3 can temporarily store the NG boards without affecting the OK boards from entering the OK material channel 5 through the transport channel 4, further improving inspection efficiency.

[0057] Specifically disclosed, preliminary detection unit 2 includes:

[0058] A cleaning rack 21 is fixedly installed inside the machine body 1. A conveyor belt 22 is installed inside the cleaning rack 21, and multiple guides 23 are installed above the conveyor belt 22. An ultrasonic probe is installed in the guide 23.

[0059] The barcode camera 24 is fixedly installed on the side of the cleaning rack 21.

[0060] During use, after the PCB board enters the cleaning rack 21, it directly enters the area between the conveyor belt 22 and multiple guide members 23. Since the guide members 23 are equipped with ultrasonic probes, ultrasonic surface cleaning is performed when the PCB board is guided by the multiple guide members 23. At the same time, after cleaning, the PCB board moves out of the cleaning rack 21. At this time, the barcode scanner 24 on the side of the cleaning rack 21 scans the barcode, thereby distinguishing whether the PCB board is OK or NG material.

[0061] Specifically disclosed, cache unit 3 includes:

[0062] The conveyor frame 31 is fixedly connected between the cleaning frame 21 and the transport channel 4. Multiple conveyor rollers 32 are rotatably arranged inside the conveyor frame 31.

[0063] A buffer rack 33 is located on the back of the conveyor rack 31, and a movable rack 34 is slidably arranged on the front of the buffer rack 33. Multiple buffer bars 35 are fixedly arranged on the front of the movable rack 34. The multiple buffer bars 35 are arranged vertically in multiple layers, and the multiple buffer bars 35 are respectively located in the gap space between multiple conveyor rollers 32.

[0064] Furthermore, an adjusting motor 36 is fixedly installed on the top of the buffer frame 33, and a lead screw is fixedly installed on the output end of the adjusting motor 36. A threaded block is threadedly connected to the outer side of the lead screw, and the threaded block is fixedly installed on the back of the movable frame 34. A guide rod 37 is also fixedly installed inside the buffer frame 33. A guide block is movably sleeved on the outer side of the guide rod 37, and the guide block is fixedly installed on the back of the movable frame 34.

[0065] After initial inspection, the PCB board is first transferred to the conveyor frame 31 in the buffer unit 3, so that the PCB board is in contact with the multiple conveyor rollers 32 in the conveyor frame 31. When the re-inspection unit 6 is inspecting the NG material of the PCB board, and there is also NG material of the PCB board above the multiple conveyor rollers 32, the adjustment motor 36 is turned on. The lead screw at its output end, together with the guide rod 37, can drive the threaded block and the movable frame 34 to move vertically. The multiple buffer bars 35 on the front of the movable frame 34 are arranged vertically in multiple layers, and the multiple buffer bars 35 are respectively located in the gap space between the multiple conveyor rollers 32. Therefore, when the multiple buffer bars 35 move vertically, they can lift the NG material of the PCB board above the multiple conveyor rollers 32, and thus buffer the NG material of the PCB board above it, so as to prevent the initial inspection unit 2 from being unable to perform the inspection work.

[0066] Specifically disclosed, re-inspection unit 6 includes:

[0067] The base 61 is fixedly installed inside the body 1, and the detection platform 62 is installed above the base 61.

[0068] The first guide rail 63 is disposed above the base 61, and a positioning seat 64 is slidably disposed on the front side of the first guide rail 63. A CCD detection camera assembly 65 is disposed on the front side of the positioning seat 64, and the CCD detection camera assembly 65 is disposed above the detection platform 62.

[0069] Furthermore, a second guide rail 66 is fixedly installed above the base 61, a first drive motor 67 is installed at the end of the second guide rail 66, and a support bar is slidably installed above the second guide rail 66, and the support bar is fixedly installed at the end of the first guide rail 63.

[0070] The robotic arm unit 9 can move the PCB board NG material on the transport channel 4 to the inspection platform 62. At this time, the first guide rail 63, positioning seat 64, second guide rail 66 and support bar can drive the CCD inspection camera assembly 65 to move in two directions, thereby achieving a comprehensive inspection effect on the PCB board NG material above the inspection platform 62.

[0071] It should be emphasized that the first guide rail 63 and the second guide rail 66 are respectively provided with threaded rods that are threadedly connected to the positioning seat 64 and the support bar. Thus, under the drive of the first drive motor 67 and the motor located at the end of the first guide rail 63, the positioning seat 64 and the support bar can slide above the first guide rail 63 and the second guide rail 66 respectively, thereby achieving the position adjustment function of the CCD inspection camera assembly 65.

[0072] Specifically disclosed, the flipping unit 7 includes:

[0073] The first bearing seat 71 and the second bearing seat 72 are both fixedly installed inside the machine body 1. The first bearing seat 71 and the second bearing seat 72 are both rotatably installed inside the machine body 1. The ends of the rotatable shafts are fixedly connected to the flipping frames 73. Multiple conveying shafts are rotatably installed between the flipping frames 73 on both sides. The multiple conveying shafts are arranged vertically in two rows. The outer sides of the two rows of conveying shafts are respectively fixedly sleeved with the first positioning wheel 75 and the second positioning wheel 76.

[0074] The second drive motor 74 is fixedly mounted on the outside of the first bearing housing 71, and the second drive motor 74 is connected to one of the rotating shafts for transmission.

[0075] It should be emphasized that the two vertically arranged rotating shafts are connected by two meshing gears, and the other end of the rotating shaft is connected to the drive shaft by two meshing bevel gears. The drive shaft is connected to the drive motor, so the drive motor can drive multiple rotating shafts to rotate simultaneously.

[0076] When it is necessary to inspect the other side of the PCB board NG material, the PCB board NG material is fed between the first positioning wheel 75 and the second positioning wheel 76. Then, the second drive motor 74 drives one of the rotating shafts to rotate, which causes the flip frames 73 on both sides to rotate accordingly. This flips the PCB board NG material between the first positioning wheel 75 and the second positioning wheel 76. The flipped PCB board NG material then enters the re-inspection unit 6 again for inspection of the other side until the re-inspection is completed. The PCB board NG material then enters the re-inspection channel 8 and is moved outward.

[0077] Specifically disclosed, robotic arm unit 9 includes:

[0078] A robotic arm mounting frame 91 is fixedly installed above the OK material channel 5 and the re-inspection channel 8, and a first slide rail 92 is fixedly installed on the outer side of the robotic arm mounting frame 91. A first robotic arm motor 93 is provided at the end of the first slide rail 92.

[0079] The adsorption component 94 is slidably disposed on the outside of the first slide rail 92, and the adsorption component 94 is connected to the first robotic arm motor 93 for transmission.

[0080] Specifically disclosed, the adsorption component 94 includes:

[0081] The second slide rail 941 is slidably disposed on the outside of the first slide rail 92, and the end of the second slide rail 941 is provided with a second robotic arm motor 942.

[0082] The movable frame 943 is slidably disposed on the outside of the second slide rail 941, and the movable frame 943 is connected to the second robotic arm motor 942 for transmission.

[0083] The movable strip 944 is slidably disposed at the bottom of the movable frame 943, and multiple adsorption strips 947 are fixedly disposed at the bottom of the movable strip 944. Multiple vacuum suction cups 948 are disposed at the bottom of the multiple adsorption strips 947. By utilizing the multiple vacuum suction cups 948, a more stable adsorption effect can be achieved on the PCB board when the multiple vacuum suction cups 948 are in contact with the PCB board.

[0084] Furthermore, a rack 945 is fixedly installed at the bottom of the movable frame 943, and a third robotic arm motor 946 is fixedly installed at the end of the movable bar 944. The end of the third robotic arm motor 946 is connected to a gear that meshes with the rack 945.

[0085] Both the first slide rail 92 and the second slide rail 941 have screws rotatably installed inside, and the screws are connected to the first robotic arm motor 93 and the second robotic arm motor 942. Thus, the transmission relationship of the screws can drive the adsorption component 94 and the moving frame 943 to move in different directions. At the same time, when the third robotic arm motor 946 is working, the transmission relationship of the gear and rack 945 can drive the moving bar 944 to move, thereby causing multiple vacuum suction cups 948 to move accordingly. Thus, the multiple vacuum suction cups 948 can be adjusted in multiple dimensions to adsorb PCB boards at different positions.

[0086] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A PCB board appearance defect inspection machine, comprising a machine body (1), characterized in that, The machine body (1) is equipped with a preliminary detection unit (2), a buffer unit (3), a transport channel (4), an OK material channel (5), a re-inspection unit (6), a flipping unit (7), a re-inspection channel (8), and a robotic arm unit (9). The re-inspection unit (6), the flipping unit (7) and the re-inspection channel (8) are located on the side of the preliminary inspection unit (2), the buffer unit (3) and the transport channel (4), and the robotic arm unit (9) is fixedly set above the OK material channel (5) and the re-inspection channel (8); The preliminary inspection unit (2) is used for the preliminary inspection of the PCB board. The buffer unit (3) is fixedly installed at the discharge end of the preliminary inspection unit (2) and is used for the temporary storage of NG materials of the PCB board. The transport channel (4) is fixedly installed at the discharge end of the buffer unit (3) and the feed end of the OK material channel (5) and is used for the transport of the PCB board. The re-inspection unit (6) is fixedly installed between the flipping unit (7) and the re-inspection channel (8). When the preliminary inspection unit (2) detects that the PCB board is OK material, the PCB board is transported outward through the transport channel (4) into the OK material channel (5). When the preliminary inspection unit (2) detects that the PCB board is NG material, the PCB board is transferred from the transport channel (4) to the re-inspection unit (6) for re-inspection through the robot arm unit (9). The flipping unit (7) cooperates with the re-inspection unit (6) to perform double-sided inspection on the PCB board, and after the PCB board is re-inspected, it is transported outward through the re-inspection channel (8).

2. The PCB board appearance defect inspection machine according to claim 1, characterized in that, The preliminary detection unit (2) includes: A cleaning rack (21) is fixedly installed inside the machine body (1). A conveyor belt (22) is installed inside the cleaning rack (21), and multiple guides (23) are installed above the conveyor belt (22). An ultrasonic probe is installed in the guide (23). A barcode scanner (24) is fixedly installed on the side of the cleaning rack (21).

3. The PCB board appearance defect inspection machine according to claim 1, characterized in that, The cache unit (3) includes: A conveyor frame (31) is fixedly connected between the cleaning frame (21) and the transport channel (4). Multiple conveyor rollers (32) are rotatably arranged inside the conveyor frame (31). A buffer frame (33) is set on the back of the conveyor frame (31), and a movable frame (34) is slidably set on the front of the buffer frame (33). Multiple buffer bars (35) are fixedly set on the front of the movable frame (34). The multiple buffer bars (35) are arranged vertically in multiple layers, and the multiple buffer bars (35) are respectively located in the gap space between multiple conveyor rollers (32).

4. A PCB board appearance defect inspection machine according to claim 3, characterized in that, An adjusting motor (36) is fixedly installed on the top of the buffer frame (33). A lead screw is fixedly installed at the output end of the adjusting motor (36). A threaded block is threadedly connected to the outer side of the lead screw, and the threaded block is fixedly installed on the back of the movable frame (34). A guide rod (37) is also fixedly installed inside the buffer frame (33). A guide block is movably sleeved on the outer side of the guide rod (37), and the guide block is fixedly installed on the back of the movable frame (34).

5. A PCB board appearance defect inspection machine according to claim 1, characterized in that, The re-inspection unit (6) includes: The base (61) is fixedly installed inside the body (1), and a detection platform (62) is installed above the base (61); The first guide rail (63) is located above the base (61), and a positioning seat (64) is slidably provided on the front of the first guide rail (63). A CCD detection camera assembly (65) is provided on the front of the positioning seat (64), and the CCD detection camera assembly (65) is located above the detection platform (62).

6. A PCB board appearance defect inspection machine according to claim 5, characterized in that, A second guide rail (66) is fixedly installed above the base (61), a first drive motor (67) is installed at the end of the second guide rail (66), and a support bar is slidably installed above the second guide rail (66), and the support bar is fixedly installed at the end of the first guide rail (63).

7. A PCB board appearance defect inspection machine according to claim 1, characterized in that, The flipping unit (7) includes: The first bearing seat (71) and the second bearing seat (72) are both fixedly installed inside the machine body (1). The first bearing seat (71) and the second bearing seat (72) are both rotatably installed inside the first bearing seat (71) and the second bearing seat (72). The end of the rotatable shaft is fixedly connected to the flipping frame (73). Multiple conveying shafts are rotatably installed between the flipping frames (73) on both sides. The multiple conveying shafts are arranged vertically in two rows. The outer sides of the two rows of conveying shafts are respectively fixedly sleeved with the first positioning wheel (75) and the second positioning wheel (76). The second drive motor (74) is fixedly mounted on the outside of the first bearing housing (71) and is connected to one of the rotating shafts.

8. A PCB board appearance defect inspection machine according to claim 1, characterized in that, The robotic arm unit (9) includes: A robotic arm mounting frame (91) is fixedly installed above the OK material channel (5) and the re-inspection channel (8), and a first slide rail (92) is fixedly installed on the outside of the robotic arm mounting frame (91), and a first robotic arm motor (93) is provided at the end of the first slide rail (92). The adsorption component (94) is slidably disposed on the outside of the first slide rail (92) and is connected to the first robotic arm motor (93) for transmission.

9. A PCB board appearance defect inspection machine according to claim 8, characterized in that, The adsorption component (94) includes: The second slide rail (941) is slidably disposed on the outside of the first slide rail (92), and the end of the second slide rail (941) is provided with a second robotic motor (942); The movable frame (943) is slidably disposed on the outside of the second slide rail (941), and the movable frame (943) is connected to the second manipulator motor (942) for transmission. The movable strip (944) is slidably disposed at the bottom of the movable frame (943), and multiple adsorption strips (947) are fixedly disposed at the bottom of the movable strip (944), and multiple vacuum suction cups (948) are disposed at the bottom of the multiple adsorption strips (947).

10. A PCB board appearance defect inspection machine according to claim 9, characterized in that, The bottom of the movable frame (943) is also fixedly provided with a rack (945), and the end of the movable bar (944) is fixedly provided with a third manipulator motor (946), and the end of the third manipulator motor (946) is connected to a gear that meshes with the rack (945).

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