Intelligent appearance detection device for printed circuit board

Abstract

The invention discloses an intelligent appearance detection device for a printed circuit board, and is applied to the technical field of appearance detection of the printed circuit board. Comprising a detection table, a conveying mechanism arranged at the top of the detection table, a plurality of brackets fixed in the conveying mechanism, a detection mechanism and two sets of first overturning assemblies arranged on one side of the conveying mechanism, and two sets of cleaning mechanisms arranged on the other side of the conveying mechanism, and the first overturning assemblies and the cleaning mechanisms are oppositely arranged; the detection mechanism is used for obtaining a surface picture of a circuit board and identifying and judging the obtained picture, the first overturning assembly is used for overturning the circuit board which is detected to be qualified, and the cleaning mechanism is used for removing dust and chippings on the surface of the circuit board and overturning the circuit board; the detection mechanism comprises a three-axis driving seat and a camera, the camera is electrically connected with an identification and judgment module, and the identification and judgment module is used for acquiring a shot picture and identifying wrinkles and dust on the surface of the circuit board; according to the invention, the appearance detection efficiency and quality of the printed circuit board can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of printed circuit board appearance detection, in particular to an intelligent appearance detection device for a printed circuit board. Background Art

[0002] As an effective carrier of electronic components, circuit boards have always been hailed as the aircraft carrier of electronic components. They are the key core components of modern electronic equipment and products, and are a strong support for the rapid development of modern science and technology. They have a huge role and influence on the safety, stability, efficiency and reliability of products, especially in the fields of aviation, aerospace, military industry, automobiles, shipbuilding and power generation. The requirements are more stringent. Therefore, people use various technical means to ensure the efficient, high-speed, high-quality and low-cost production of circuit boards, which has become an important research topic and activity content.

[0003] There is an appearance quality inspection link after multiple processes in the production of circuit boards. The purpose is to detect whether the produced circuit boards meet the quality requirements. If they do, they will enter the next process. If they do not, they will be rejected or reworked. The current inspection method is to manually use a single-hole microscope to check the patterns on the circuit board one by one. As the hole density of circuit boards becomes higher and higher, the hole diameter becomes smaller and smaller, the lines become thinner and thinner, and the appearance quality requirements become higher and higher, the above conventional inspection methods can meet the quality requirements, but the efficiency is very low, and the circuit board needs to be held in hand, which is easy to fall or break during the inspection process.

[0004] Therefore, it is necessary to provide an intelligent appearance inspection device for printed circuit boards to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide an intelligent appearance inspection device for a printed circuit board, which can improve the appearance inspection efficiency and quality of the printed circuit board to solve the problems raised in the above-mentioned background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: an intelligent appearance inspection device for printed circuit boards, comprising a detection platform, a conveying mechanism arranged on the top of the detection platform, a plurality of brackets fixed inside the conveying mechanism, a detection mechanism and two sets of flipping components one arranged on one side of the conveying mechanism, and two sets of cleaning mechanisms arranged on the other side of the conveying mechanism, the flipping component one and the cleaning mechanism are arranged opposite to each other, the detection mechanism is used to obtain a surface image of the circuit board and identify and judge the obtained image, the flipping component one is used to flip the circuit board that has passed the inspection, and the cleaning mechanism is used to remove dust and debris on the surface of the circuit board and flip the circuit board, and the printed circuit boards are collectively referred to as circuit boards hereinafter; The detection mechanism includes a three-axis drive seat and a camera, the camera is electrically connected to a recognition and judgment module, and the recognition and judgment module is used to obtain the shooting picture and identify the wrinkles and dust on the surface of the circuit board; The cleaning mechanism includes a processing box, a second flip assembly arranged inside the processing box, and a cleaning assembly. The processing box is used to prevent dust and debris from flying when cleaning the circuit board. The second flip assembly is used to clamp both ends of the circuit board and flip it. The cleaning assembly is used to clean dust and debris on the surface of the circuit board. The cleaning assembly includes a cylinder three and a cleaning part, the cleaning part includes a connecting frame two, an inner tube fixed on the connecting frame two, an outer tube connected to the inner tube bearing and bristles fixed on the outer tube, an air inlet cavity and an air outlet cavity are arranged inside the inner tube, and the air inlet cavity and the air outlet cavity are respectively connected to a filter, a heating device and an air pump through pipelines; The inner tube is provided with two groups of staggered air holes, which correspond to the air inlet cavity and the air outlet cavity respectively, and each group of air holes is provided with a plurality of air holes. Two groups of cavities are provided inside the outer tube, and an airway is provided on the outer tube, which corresponds to the position of the airway and the airway. The side of the second connecting frame is fixedly connected with the driving five, and the output end of the driving five passes through the second connecting frame and is connected to the outer tube by a gear transmission method. The cleaning unit can achieve self-cleaning inside the box, handle dust and debris on the circuit board, and self-clean the bristles. It can also remove wrinkles on the circuit board by heating and stretching the circuit board.

[0007] According to the above technical solution, the three-axis drive seat is fixed on the top of the detection platform, the side of the three-axis drive seat is fixedly connected to the two sets of connecting frames, and the camera is fixed on the bottom of the connecting frame.

[0008] According to the above technical solution, flipping component 1 includes a dual-axis drive frame and an air gripper. The dual-axis drive frame is fixed on the top of the inspection table. The top of the dual-axis drive frame is fixedly connected to drive six. The output end of drive six is ​​fixedly connected to the air gripper, which can clamp the middle of the circuit board for flipping, thereby simplifying the flipping process.

[0009] According to the above technical solution, the processing box includes a box body and a movable plate, a flip door is hingedly connected to one side of the box body close to the conveying mechanism, two sets of empty slots are arranged inside the box body, the empty slots are arranged on both sides of the flip door, a slider is arranged in the empty slot, the flip door is connected to the slider with a gear rack transmission, a spring is fixedly connected to the bottom of the slider, and the bottom of the spring is fixedly connected to the box body, so that the flip door can be opened and closed in linkage; The movable plate is slidably connected to the box body, and two groups of empty slots 2 and a through slot are opened inside the movable plate. The through slot is located below the center of the movable plate, and the empty slots 2 are arranged on the upper and lower sides of the through slot. A spring 2 is arranged in the empty slot 2, and the spring 2 is fixedly connected to the back plate. The other end of the spring 2 is fixedly connected to a slide plate, and a back plate is arranged in the through slot. The back plate is slidably connected to the movable plate, and the slide plate is in contact with the back plate, which can keep the movable plate, the back plate and the slide plate still in a completed plane, ensuring that the inside of the processing box can be self-cleaned, and at the same time, it can avoid dust scattering when cleaning the circuit board, thereby avoiding affecting the qualified and untested circuit boards.

[0010] According to the above technical solution, the flip assembly 2 includes a slider 2 and a driver 1, the slider 2 is slidably connected to the box body through a limit column, the top of the slider 2 is fixedly connected to a cylinder 1, and the output end of the cylinder 1 is fixedly connected to the back plate; Driver 1 is fixed on the back plate, and the output end of driver 1 passes through the back plate and is fixedly connected with connecting block 1, one side of the connecting block is fixedly connected with two groups of relatively arranged cylinders 2, and the output end of cylinder 2 is fixedly connected with connecting block 2, and a slide groove 1 is provided on the opposite side of the two groups of connecting blocks 2, and two groups of clamping blocks are arranged in the slide groove 1, and the clamping blocks are slidably connected with the connecting block 2, and pressure sensors are arranged on the opposite side of the two groups of clamping blocks, and a plurality of drivers 2 are fixedly connected with the top of the connecting block 2, and the output end of the driver 2 is connected with the two groups of clamping blocks, and the flip component 2 can clamp the two ends of the circuit board for flipping, and can also stretch the circuit board to deal with the wrinkles on the surface of the circuit board.

[0011] According to the above technical solution, cylinder three is fixed to the side of the movable plate, and slider three is fixedly connected to the output end of cylinder three. Slider three slides in the box through a limiting column, and cylinder four is fixedly connected to the bottom of slider three. Connecting block three is fixedly connected to the output end of cylinder four. Slide groove two is provided on connecting block three, and the cleaning part is arranged in slide groove two. Drive three is fixedly connected to connecting block three, and drive three and the cleaning part are connected by gear rack transmission; connecting frame two and drive three are connected by gear rack transmission.

[0012] According to the above technical solution, a slider four is slidably connected to the bottom of the connecting frame two, a baffle is hinged at the bottom of the slider four, a bearing seat is slidably connected to the baffle, and the bearing seat is connected to the bearing at the output end of the drive five. Under the resistance of the baffle, the dust on the bristles can be cleaned, thereby realizing self-cleaning of the bristles and reducing the number of cleaning times by the staff.

[0013] According to the above technical solution, a marking assembly is arranged on the left side of the cleaning mechanism, and the marking assembly includes a three-axis movable frame and a marking head fixed to the side of the three-axis movable frame, and the three-axis movable frame is fixed to the top of the detection table.

[0014] According to the above technical solution, storage parts are provided at both ends of the conveying mechanism, and the storage parts adopt the bottom and the bottom to be able to load and unload materials.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention, by providing a cleaning part, when driving the five-drive outer tube to rotate, combines with the air pump to start suction, so as to realize blowing, rolling brushing, and dusting the surface of the circuit board to remove dust from the surface of the circuit board; by providing a flipping component, on the basis of normal flipping of the circuit board, when the flipping component drives the movement of the movable plate when clamping the circuit board from the conveying mechanism, the cleaning part is combined to perform self-cleaning inside the processing box; when the circuit boards are all located inside the processing box, by introducing hot air into the cleaning part, combined with the flipping component to increase the stretching of the circuit board when clamping, the wrinkles on the surface of the circuit board can be removed, thereby improving the appearance inspection efficiency and quality of the printed circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a partial structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of the overall structure of the cleaning mechanism of the present invention; Figure 4 It is a schematic diagram of the internal structure of the cleaning mechanism of the present invention; Figure 5 It is a schematic diagram of the front end cross-sectional structure of the cleaning mechanism of the present invention; Figure 6 The present invention Figure 5 A schematic diagram of the enlarged structure of the middle A area; Figure 7 It is a schematic diagram of the rear end cross-sectional structure of the cleaning mechanism of the present invention; Figure 8 It is a schematic diagram of a side cross-sectional structure of a cleaning mechanism of the present invention; Fig. 9 It is a partial structural schematic diagram of the cleaning mechanism of the present invention; Fig.10 It is a schematic diagram of a side cross-sectional structure of a cleaning portion of the present invention; Fig.11 It is a schematic diagram of a top view and cross-sectional structure of a cleaning part of the present invention; In the figure: 1. Testing table; 2. Conveying mechanism; 3. Bracket; 4. Detection mechanism; 41. Three-axis drive seat; 42. Connecting frame 1; 43. Camera; 5. Flip assembly one; 51. Double-axis drive frame; 52. Drive six; 53. Air claw; 6. Cleaning mechanism; 61. Processing box; 611. Box body; 612. Flip door; 613. Slider 1; 614. Spring 1; 615. Movable plate; 616. Spring 2; 617. Slide plate; 618. Back plate; 62. Flip assembly 2; 621. Slider 2; 622. Cylinder 1; 623. Drive 1; 624. Cylinder 2; 625. Connecting block 2; 626. Clamping block; 627. Drive 2; 628. Connecting block 1; 63. Cleaning assembly; 631. Cylinder three; 632. Slider three; 633. Cylinder four; 634. Connecting block three; 635. Drive three; 7. cleaning part; 71. connecting frame 2; 72. inner tube; 73. outer tube; 74. air inlet cavity; 75. air outlet cavity; 76. air hole; 77. airway; 78. drive 5; 79. bristles; 710. slider 4; 711. baffle; 712. cavity; 8. Marking assembly; 81. Three-axis moving frame; 82. Marking head; 9. Storage unit. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 1 and Figure 2 The present invention provides a technical solution: an intelligent appearance inspection device for a printed circuit board, comprising a detection platform 1, a conveying mechanism 2 arranged on the top of the detection platform 1, a plurality of brackets 3 fixed inside the conveying mechanism 2, a detection mechanism 4 and two groups of flipping components 5 arranged on one side of the conveying mechanism 2, and two groups of cleaning mechanisms 6 arranged on the other side of the conveying mechanism 2, the flipping components 5 and the cleaning mechanisms 6 are arranged relatively to each other, the conveying mechanism 2 is used to convey the printed circuit board to be inspected, and the printed circuit board is hereinafter collectively referred to as the circuit board, the bracket 3 is used to fix the circuit board in the state of clamping inspection and flipping, the bracket 3 corresponds to the detection mechanism 4, the flipping component 5, and the cleaning mechanism 6, the detection mechanism 4 is used to obtain the surface image of the circuit board and identify and judge the obtained image, the flipping component 5 is used to flip the circuit board that has passed the inspection, and the cleaning mechanism 6 is used to remove dust and debris on the surface of the circuit board and flip the circuit board.

[0019] It should be noted that the conveying mechanism 2 uses a motor-driven conveyor belt to convey the circuit board; the bracket 3 is a pneumatically lifted tray, and the conveying mechanism 2 and the bracket 3 are existing structures and are not described in detail here.

[0020] Specifically, refer to Figure 2 The detection mechanism 4 includes a three-axis drive seat 41 and a camera 43. The three-axis drive seat 41 is fixed on the top of the detection platform 1. The side of the three-axis drive seat 41 is fixedly connected to two groups of connecting frames 42. The camera 43 is fixed to the bottom of the connecting frame 42. The camera 43 is electrically connected to the recognition and judgment module. The three-axis drive seat 41 is used to drive the two groups of cameras 43 to move synchronously back and forth, left and right, and up and down. The camera 43 is used to shoot the upper and lower surfaces of the circuit board. The recognition and judgment module is used to obtain the shooting picture and identify wrinkles and dust on the surface of the circuit board.

[0021] Specifically, refer to Figure 2 The flip assembly 5 includes a dual-axis driving frame 51 and an air gripper 53. The dual-axis driving frame 51 is fixed on the top of the detection table 1. The top of the dual-axis driving frame 51 is fixedly connected with a driving six 52. The output end of the driving six 52 is fixedly connected with the air gripper 53. The dual-axis driving frame 51 is used to drive the cylinder to move up and down and move in the vertical direction of the transmission mechanism 2. The driving six 52 is driven by a motor. When in use, the dual-axis driving frame 51 drives the air gripper 53 to move and rise and fall along the transmission direction of the vertical transmission mechanism 2. The air gripper 53 clamps the middle part of the circuit board. The driving six 52 starts to rotate, driving the air gripper 53 to rotate, thereby realizing the flipping of the circuit board clamped by the air gripper 53.

[0022] Specifically, refer to Figure 3-Figure 4 The cleaning mechanism 6 includes a processing box 61, a flip assembly 62 and a cleaning assembly 63 arranged inside the processing box 61. The processing box 61 is used to prevent dust and debris from flying when cleaning the circuit board. The flip assembly 62 is used to clamp the two ends of the circuit board and flip it. The cleaning assembly 63 is used to clean dust and debris on the surface of the circuit board.

[0023] For further reference, Figure 3 , Figure 5 and Figure 6 The processing box 61 includes a box body 611 and a movable plate 615. A flip door 612 is hingedly connected to one side of the box body 611 near the conveying mechanism 2. Two groups of empty slots 1 are arranged inside the box body 611. The empty slots 1 are arranged on both sides of the flip door 612. A slider 1 613 is arranged in the empty slot 1. The flip door 612 is connected to the slider 1 613 through a gear rack transmission. A spring 1 614 is fixedly connected to the bottom of the slider 1 613. The bottom of the spring 1 614 is fixedly connected to the box body 611. When the flip door 612 is opened under the action of an external force, the slider 1 613 is driven to rise through the gear rack transmission, and the spring 1 614 is stretched at the same time. After that, when the flip door 612 is free from the external force, the slider 1 613 descends under the pulling force of the spring 1 614 and the dead weight of the slider 1 613, so that the flip door 612 is automatically closed; refer to Figure 7The movable plate 615 is slidably connected to the box body 611, and two groups of empty slots 2 and a through slot are opened inside the movable plate 615. The through slot is located below the center of the movable plate 615, and the empty slots 2 are arranged on the upper and lower sides of the through slot. A spring 2 616 is arranged in the empty slot 2, and the spring 2 616 is fixedly connected to the back plate 618. The other end of the spring 2 616 is fixedly connected to a slide plate 617, and a back plate 618 is arranged in the through slot. The back plate 618 is slidably connected to the movable plate 615, and the slide plate 617 contacts the back plate 618. When the back plate 618 is raised or lowered, the compression degree of the two groups of springs 2 616 changes, so as to synchronously drive the two groups of slide plates 617 to rise or fall, so that the movable plate 615, the slide plate 617 and the back plate 618 always maintain a complete plane.

[0024] refer to Figure 4 and Figure 8 The flip assembly 2 62 includes a slider 2 621 and a driver 1 623. The slider 2 621 is slidably connected to the box 611 through a limit column. The slider 2 621 is driven by a cylinder to slide left and right in the box 611. The top of the slider 2 621 is fixedly connected to a cylinder 1 622. The output end of the cylinder 1 622 is fixedly connected to the back plate 618. A driver 623 is fixed on the back plate 618, and the output end of the driver 623 passes through the back plate 618 and is fixedly connected to a connection block 628, and two groups of cylinders 624 arranged opposite to each other are fixedly connected to the side of the connection block 628, and the output end of the cylinder 624 is fixedly connected to a connection block 625, and a slide groove 1 is provided on the opposite side of the two groups of connection blocks 625, and two groups of clamping blocks 626 are arranged in the slide groove 1, and the clamping blocks 626 are slidably connected to the connection blocks 625, and pressure sensors are arranged on the opposite side of the two groups of clamping blocks 626, and the pressure sensors adopt a dot matrix type, and a plurality of drivers 627 are fixedly connected to the top of the connection block 625, and the drivers 627 adopt a motor combined with a bidirectional screw drive mode, and the output end of the driver 627 is connected to the two groups of clamping blocks 626, and the driver 627 is used to drive the two groups of clamping blocks 626 to clamp or release the circuit board; In actual operation, the slider 621 slides back and forth to adjust the front and rear position of the clamping block 626 for clamping the circuit board; the cylinder 622 starts to extend and retract to drive the back plate 618 to rise and fall, so as to adjust the height of the two groups of clamping blocks 626 when clamping the circuit board; the cylinder 624 extends and retracts to adjust the spacing between the two groups of connecting blocks 625 to suit clamping circuit boards of different sizes; the drive 623 starts to rotate to drive the connecting block 628 to rotate, so as to flip the circuit board clamped by the two groups of clamping blocks 626; the pressure sensor is used to detect the clamping force after the two groups of clamping blocks 626 clamp the circuit board.

[0025] refer to Figure 3 , Figure 4 and Figure 8The cleaning assembly 63 includes a cylinder 3 631 and a cleaning part 7. The cylinder 3 631 is fixed to the side of the movable plate 615. The output end of the cylinder 3 631 is fixedly connected to a slider 3 632. The slider 3 632 slides in the box 611 through a limiting column. The bottom of the slider 3 632 is fixedly connected to a cylinder 4 633. The output end of the cylinder 4 633 is fixedly connected to a connecting block 3 634. The connecting block 3 634 is provided with a chute 2. The cleaning part 7 is arranged in the chute 2. The connecting block 3 634 is fixedly connected to a driving block 3 635. The driving block 3 635 and the cleaning part 7 are connected by a gear rack transmission. For further reference, Figure 8-Figure 11 The cleaning part 7 includes a second connecting frame 71, an inner tube 72 fixed on the second connecting frame 71, an outer tube 73 connected to the inner tube 72 bearing, and bristles 79 fixed on the outer tube 73. The second connecting frame 71 is connected to the driving three 635 by a gear rack transmission. An air inlet cavity 74 and an air outlet cavity 75 are arranged inside the inner tube 72. The air inlet cavity 74 and the air outlet cavity 75 are respectively connected to a filter, a heating device and an air pump through pipelines. The air pumps are dual-purpose air pumps. The heating device can be a heating wire or other components that can heat air. Two groups of staggered air holes 76 are provided on the inner tube 72, and the two groups of air holes 76 correspond to the air inlet cavity 74 and the air outlet cavity 75 respectively, and each group of air holes 76 is provided with a plurality of air holes. Two groups of cavities 712 are provided inside the outer tube 73, and an air passage 77 is provided on the outer tube 73, and the positions of the air passage 77 and the air passage 77 correspond to the positions of the air holes 76. A driving device 78 is fixedly connected to the side of the second connecting frame 71, and the output end of the driving device 78 passes through the second connecting frame 71 and is connected to the outer tube 73 by a gear transmission method; A slider block 4 710 is slidably connected to the bottom of the connecting frame 2 71 , a baffle plate 711 is hinged at the bottom of the slider block 4 710 , a bearing seat is slidably connected to the baffle plate 711 , and the bearing seat is connected to the output end bearing of the drive 5 78 . The staff adjusts the position of the slider block 4 710 so that the baffle plate 711 can contact the bristles 79 , and then uses fasteners to fix the position of the slider block 4 710 .

[0026] In actual operation, cylinder three 631 is extended and retracted to drive slider three 632 to move forward and backward in box body 611 to adjust the front and rear position of cleaning part 7 in box body 611; cylinder four 633 is extended and retracted to adjust the lifting height of cleaning part 7; drive three 635 is started to adjust the left and right position of cleaning part 7 in box body 611; the air pump connected to air inlet chamber 74 is started to introduce gas into the inside of air inlet chamber 74, so as to blow away the dust and debris on the surface of clamped circuit board; the air pump connected to air outlet chamber 75 draws out the air inside of air outlet chamber 75, so as to recover the blown dust and debris, so as to achieve the dust removal effect; drive five 78 is started to drive outer tube 73 to rotate through gear transmission, so as to remove the dust and debris on the surface of clamped circuit board, so as to achieve the dust removal effect; when rotating bristles 79 contact baffle 711, the dust on bristles 79 can be removed under the action of resistance of baffle 711, so as to achieve the self-cleaning effect of bristles 79.

[0027] See also Figure 2 A marking assembly 8 is arranged on the left side of the cleaning mechanism 6. The marking assembly 8 includes a three-axis movable frame 81 and a marking head 82 fixed to the side of the three-axis movable frame 81. The three-axis movable frame 81 is fixed to the top of the detection table 1. The three-axis movable frame 81 is used to drive the marking head 82 to move forward and backward, left and right, and up and down. The marking head 82 is used to mark abnormal areas on the surface of the circuit board, including wrinkled areas and areas with dust and debris.

[0028] The conveying mechanism 2 is provided with a storage portion 9 at both ends. The storage portion 9 adopts a bottom and both the bottom can be used for loading and unloading. The storage portion 9 is used for storing the circuit board before and after loading and unloading. The storage portion 9 is an existing structure and will not be described in detail.

[0029] The inspection steps of the intelligent appearance inspection device for circuit boards are as follows: Step 1: The right end bracket 3 takes the circuit board from the storage portion 9 and places it on the conveying mechanism 2 for forward conveyance; Step 2: Perform appearance inspection and adjustment, the inspection mechanism 4 obtains the surface image of the circuit board, the recognition and judgment module identifies the wrinkles and dust on the surface of the circuit board, the flip component 1 5 flips the circuit board that has passed the inspection, and the cleaning mechanism 6 processes the circuit board that has failed the inspection, including removing dust and debris on the surface of the circuit board, stretching the circuit board and flipping the circuit board; Specifically, when the recognition and judgment module recognizes that the surface of the circuit board photographed by the camera 43 is smooth and dust-free, it is qualified for detection, and the rest are unqualified and processed by the cleaning mechanism 6; It should be noted that the surface photographed by the left camera 43 is called the front side, and the surface photographed by the right camera 43 after flipping is called the back side; the forward transmission direction of the transmission mechanism 2 is from right to left.

[0030] When the front side of the circuit board is tested to be qualified, the right flipping assembly 15 flips the circuit board and then tests the back side of the circuit board. When the back side is also tested to be qualified, the left flipping assembly 15 flips the circuit board again so that the front side of the circuit board faces upwards. When the front detection of the circuit board fails, the circuit board is processed by the cleaning mechanism 6; Specifically, when the recognition and judgment module identifies that there is dust and wrinkles on the front of the circuit board, the recognition and judgment module further identifies and obtains the area ratio of the dust area and the area ratio of the wrinkle area, the dust area ratio is denoted as a, the wrinkle area ratio is denoted as b, and a threshold value of the area ratio is set in the recognition and judgment module, the threshold value is denoted as N, and N is set according to actual needs.

[0031] Case 1: When a≥N, the interior of the box 611 is self-cleaned, the cleaning part 7 is rolled for cleaning, it is not flipped, and re-testing is performed: ① The cleaning part 7 on the cleaning component 63 is close to the inside of the box 611, close to the side of the conveying mechanism 2 and located above the flip door 612; ② The flip component 2 62 clamps the circuit board, and when the cylinder pushes the slider 2 621 to slide toward the conveying mechanism 2, the movable plate 615 also moves toward the conveying mechanism 2 with the slider 2 621, and the gas inside the box 611 is discharged. At the same time, the drive 5 78 starts to drive the outer tube 73 to rotate clockwise at a small angle so that the airway 77 corresponding to the air outlet cavity 75 is partially facing downward, that is, the airway 77 and the air hole 76 are still connected, but the airway 77 is in a downward state; ③ The air pump connected to the air outlet cavity 75 is started to extract the air inside the air outlet cavity 75. At this time, the extracted gas is the box 611. The gas discharged from the inside achieves the effect of self-cleaning and dust removal inside the box 611; ④ When the circuit board is clamped and entered into the box 611, the above state is maintained until the circuit board is completely entered into the box 611 and the flip door 612 is closed; ⑤ Drive five 78 is started to drive the outer tube 73 to rotate in a circle, so that the bristles 79 remove the dust and debris on the surface of the circuit board, and at the same time, the air pump connected to the air inlet cavity 74 is started to pass gas into the air inlet cavity 74, which can blow away the dust and debris on the surface of the circuit board, and the air pump connected to the air outlet cavity 75 draws out the air inside the air outlet cavity 75, and recovers the blown dust and debris to achieve the dust removal effect; ⑥ After the dust removal is completed, when the flip component two 62 puts the circuit board back on the conveying mechanism 2, the state of step ③ above is maintained at the same time, the conveying mechanism 2 is reversed, and the left camera 43 re-shoots, and this step is repeated.

[0032] Case 2: When a<N, the box 611 is self-cleaned inside, the cleaning part 7 is rolled and cleaned, and then flipped: the processing method is based on case 1, and step ⑥ is replaced by the flip component 2 62 clamping both ends of the circuit board and flipping the circuit board, and then putting the circuit board back on the conveying mechanism 2, while maintaining the state of step ③ above, and the conveying mechanism 2 is still in the forward transmission; Case 3: When b≥N, the circuit board is not processed, and the corresponding circuit board is scrapped and marked by the subsequent marking component 8; Case 4: When b<N, stretch the circuit board and then test it: flip assembly 2 62 clamps the circuit board to enter the box 611. When clamping the circuit board, the clamping force detected by the pressure sensor is kept within the set range, and the specific set range is set manually. At the same time, drive 5 78 starts to drive the outer tube 73 to rotate counterclockwise at a small angle so that the air duct 77 corresponding to the air inlet cavity 74 is partially facing downward, that is, the air duct 77 and the air hole 76 are still connected, but the air duct 77 is in a downward state. At the same time, the air pump connected to the air inlet cavity 74 is started, and the heating device is heated to pass hot air into the air inlet cavity 74 to heat the surface of the circuit board; then the cylinder 2 624 is extended by a set extension amount to stretch the clamped circuit board, and the specific extension amount is set manually; after the stretching is completed, the flip assembly 2 puts the circuit board back on the conveying mechanism 2, the conveying mechanism 2 is reversed, and the left camera 43 re-shoots, and repeats this step.

[0033] It should be noted that when there is both dust and wrinkles on the front of the circuit board, situation one, situation two and situation four can be carried out simultaneously; when situation three occurs, if situation one and situation two occur at the same time, it is still handled in the manner of situation three, and situation one and situation two are not handled; in this step, repeated inspection is only performed once, and if the repeated inspection is still unqualified, the marking component 8 marks the abnormal area; after the front side inspection of the circuit board is completed, the back side inspection method is consistent with the front side inspection method.

[0034] Step 3: The marking component 8 marks the abnormal area on the surface of the circuit board; Step 4: The left end bracket 3 lifts the tested circuit board into the storage portion 9 for storage.

[0035] Through the above steps, wrinkles and dust on the surface of the printed circuit board can be quickly detected, and the dust and wrinkles can be removed according to the area ratio of the wrinkles and dust, thereby improving the appearance inspection efficiency and quality of the printed circuit board.

[0036] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0037] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An intelligent appearance inspection device for a printed circuit board, comprising an inspection platform (1), a conveying mechanism (2) arranged on the top of the inspection platform (1), a plurality of brackets (3) fixed inside the conveying mechanism (2), an inspection mechanism (4) and two sets of flipping components (5) arranged on one side of the conveying mechanism (2), and two sets of cleaning mechanisms (6) arranged on the other side of the conveying mechanism (2), characterized in that: The flip assembly 1 (5) and the cleaning mechanism (6) are arranged relative to each other, the detection mechanism (4) is used to obtain the surface image of the circuit board and identify and judge the obtained image, and the cleaning mechanism (6) is used to remove dust and debris on the surface of the circuit board and flip the circuit board; The detection mechanism (4) comprises a three-axis drive seat (41) and a camera (43), wherein the camera (43) is electrically connected to a recognition and judgment module, and the recognition and judgment module is used to obtain a captured image and recognize wrinkles and dust on the surface of the circuit board; The cleaning mechanism (6) comprises a processing box (61), a second flipping assembly (62) arranged inside the processing box (61), and a cleaning assembly (63); the processing box (61) is used to prevent dust and debris from flying when cleaning the circuit board; the second flipping assembly (62) is used to clamp the two ends of the circuit board and flip it; and the cleaning assembly (63) is used to clean dust and debris on the surface of the circuit board; The cleaning assembly (63) comprises a third cylinder (631) and a cleaning portion (7), the cleaning portion (7) comprising a second connecting frame (71), an inner tube (72) fixed to the second connecting frame (71), an outer tube (73) connected to a bearing of the inner tube (72), and bristles (79) fixed to the outer tube (73), an air inlet cavity (74) and an air outlet cavity (75) are provided inside the inner tube (72), and the air inlet cavity (74) and the air outlet cavity (75) are respectively connected to a filter, a heating device and an air pump via pipelines; The inner tube (72) is provided with two groups of staggered air holes (76), the two groups of air holes (76) respectively corresponding to the air inlet cavity (74) and the air outlet cavity (75), each group of air holes (76) is provided with a plurality of air holes, the outer tube (73) is provided with two groups of cavities (712), the outer tube (73) is provided with an air passage (77), the air passage (77) corresponding to the position of the air holes (76), the side of the second connecting frame (71) is fixedly connected with the fifth driving force (78), the output end of the fifth driving force (78) passes through the second connecting frame (71) and is connected to the outer tube (73) by means of gear transmission.

2. The intelligent appearance inspection device for a printed circuit board according to claim 1, characterized in that: The three-axis drive seat (41) is fixed to the top of the detection platform (1), the side of the three-axis drive seat (41) is fixedly connected to two sets of connecting frames (42), and the camera (43) is fixed to the bottom of the connecting frame (42).

3. The intelligent appearance inspection device for a printed circuit board according to claim 2, characterized in that: The flip assembly one (5) comprises a dual-axis drive frame (51) and an air gripper (53), wherein the dual-axis drive frame (51) is fixed to the top of the detection platform (1), the top of the dual-axis drive frame (51) is fixedly connected to a drive six (52), and the output end of the drive six (52) is fixedly connected to the air gripper (53).

4. The intelligent appearance inspection device for a printed circuit board according to claim 3, characterized in that: The processing box (61) comprises a box body (611) and a movable plate (615); a flip door (612) is hingedly connected to one side of the box body (611) close to the conveying mechanism (2); two groups of empty slots (1) are arranged inside the box body (611); the empty slots (1) are arranged on both sides of the flip door (612); a slider (613) is arranged inside the empty slots (1); the flip door (612) and the slider (613) are connected to each other via a gear rack transmission; a spring (614) is fixedly connected to the bottom of the slider (613); and the bottom of the spring (614) is fixedly connected to the box body (611); The movable plate (615) is slidably connected to the box body (611); two groups of empty slots 2 and a through slot are provided inside the movable plate (615); the through slot is located below the center of the movable plate (615); the empty slots 2 are arranged on the upper and lower sides of the through slot; a spring 2 (616) is arranged in the empty slot 2; the spring 2 (616) is fixedly connected to a back plate (618); the other end of the spring 2 (616) is fixedly connected to a slide plate (617); a back plate (618) is arranged in the through slot; the back plate (618) is slidably connected to the movable plate (615); and the slide plate (617) is in contact with the back plate (618).

5. The intelligent appearance inspection device for a printed circuit board according to claim 4, characterized in that: The flip assembly 2 (62) comprises a slider 2 (621) and a driver 1 (623), wherein the slider 2 (621) is slidably connected to the box body (611) via a limiting column, a cylinder 1 (622) is fixedly connected to the top of the slider 2 (621), and an output end of the cylinder 1 (622) is fixedly connected to the back plate (618); The driver one (623) is fixed on the back plate (618), and the output end of the driver one (623) passes through the back plate (618) and is fixedly connected to a connecting block one (628). The side of the connecting block one (628) is fixedly connected to two groups of cylinders two (624) arranged oppositely, and the output end of the cylinder two (624) is fixedly connected to a connecting block two (625). A slide groove one is provided on the opposite side of the two groups of connecting blocks two (625), and two groups of clamping blocks (626) are arranged in the slide groove one. The clamping blocks (626) are slidably connected to the connecting block two (625), and pressure sensors are arranged on the opposite side of the two groups of clamping blocks (626). A plurality of drivers two (627) are fixedly connected to the top of the connecting block two (625), and the output end of the driver two (627) is connected to the two groups of clamping blocks (626).

6. The intelligent appearance inspection device for a printed circuit board according to claim 5, characterized in that: The cylinder three (631) is fixed to the side of the movable plate (615), the output end of the cylinder three (631) is fixedly connected to the slider three (632), the slider three (632) slides in the box body (611) through the limit column, the bottom of the slider three (632) is fixedly connected to the cylinder four (633), the output end of the cylinder four (633) is fixedly connected to the connecting block three (634), the connecting block three (634) is provided with a slide groove two, the cleaning part (7) is arranged in the slide groove two, the connecting block three (634) is fixedly connected to the driving three (635), the driving three (635) and the cleaning part (7) are connected by a gear rack transmission; the connecting frame two (71) and the driving three (635) are connected by a gear rack transmission.

7. The intelligent appearance inspection device for a printed circuit board according to claim 6, characterized in that: The bottom of the connecting frame 2 (71) is slidably connected to a slider 4 (710), the bottom of the slider 4 (710) is hinged with a baffle (711), the baffle (711) is slidably connected to a bearing seat, and the bearing seat is connected to the output end bearing of the drive 5 (78).

8. The intelligent appearance inspection device for a printed circuit board according to claim 7, characterized in that: A marking assembly (8) is arranged on the left side of the cleaning mechanism (6), and the marking assembly (8) comprises a three-axis movable frame (81) and a marking head (82) fixed to the side of the three-axis movable frame (81), and the three-axis movable frame (81) is fixed to the top of the detection platform (1).

9. The intelligent appearance inspection device for a printed circuit board according to claim 8, characterized in that: The conveying mechanism (2) is provided with storage portions (9) at both ends, and the storage portions (9) have a structure in which both the bottom and the bottom are capable of loading and unloading materials.

10. The intelligent appearance inspection device for a printed circuit board according to claim 9, characterized in that: The detection steps of the circuit board intelligent appearance detection device are as follows: Step 1: The right end bracket (3) takes the circuit board from the storage portion (9) and places it on the conveying mechanism (2) for forward conveyance; Step 2: Perform appearance inspection and adjustment, the inspection mechanism (4) obtains the surface image of the circuit board, the recognition and judgment module identifies the wrinkles and dust on the surface of the circuit board, the flip component (5) flips the circuit board that has passed the inspection, and the cleaning mechanism (6) processes the circuit board that has failed the inspection, including removing dust and debris on the surface of the circuit board, stretching the circuit board, and flipping the circuit board; Step 3: Marking components (8) Marking abnormal areas on the surface of the circuit board; Step 4: The left end bracket (3) lifts the tested circuit board into the storage portion (9) for storage.

Images