An intelligent appearance detection device for printed circuit boards

Abstract

The present invention discloses an intelligent appearance detection device for printed circuit boards, which is applied to the technical field of printed circuit board appearance detection. The device includes a detection table, a conveying mechanism arranged on the top of the detection table, a plurality of brackets fixed inside the conveying mechanism, a detection mechanism arranged on one side of the conveying mechanism, two sets of first flipping components, and two sets of cleaning mechanisms arranged on the other side of the conveying mechanism. The first flipping components and the cleaning mechanisms are arranged opposite to each other. The detection mechanism is used to obtain the surface image of the circuit board and identify and judge the obtained image. The first flipping components are used to flip the circuit boards that pass the detection. The cleaning mechanisms are used to remove dust and debris on the surface of the circuit boards and flip the circuit boards. The detection mechanism includes a three-axis driving seat and a camera. The camera is electrically connected to an identification and judgment module, and the identification and judgment module is used to obtain the captured image and identify wrinkles and dust on the surface of the circuit board. The present invention can improve the appearance detection efficiency and quality of printed circuit boards.

Description

Technical Field

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

[0002] As an effective carrier of electronic components, the circuit board has always been hailed as the aircraft carrier of electronic components. It is a key core component of modern electronic devices and products, and a powerful support for the rapid development of modern science and technology. It has a huge impact on the safety, stability, efficiency, and reliability of products. Especially in the fields of aviation, aerospace, military, automotive, shipbuilding, and power generation, the requirements are even more stringent. Therefore, it has become an important research topic and activity content to ensure the high-efficiency, high-speed, high-quality, and low-cost production of circuit boards through various technical means.

[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 meet the requirements, they enter the next process; if they do not meet the requirements, they are rejected or reworked. Currently, the detection method is for workers to use a single-hole microscope to check the patterns on the circuit board one by one. With the increasing hole density, decreasing hole diameter, decreasing line width, and increasing appearance quality requirements of circuit boards, although the above conventional detection methods can meet the quality requirements, the efficiency is very low, and it is necessary to hold the circuit board by hand, which is prone to dropping or damage during the inspection process.

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

[0005] The purpose of the present invention is to provide an intelligent appearance detection device for printed circuit boards, which can improve the appearance detection efficiency and quality of printed circuit boards, so as to solve the problems raised in the above background art.

[0006] To solve the above technical problems, the present invention provides the following technical solution: An intelligent appearance detection device for printed circuit boards, including a detection table, a conveying mechanism arranged on the top of the detection table, a number of brackets fixed inside the conveying mechanism, a detection mechanism arranged on one side of the conveying mechanism, two sets of flipping components I, and two sets of cleaning mechanisms arranged on the other side of the conveying mechanism. The flipping components I and the cleaning mechanisms are arranged opposite to each other. The detection mechanism is used to obtain the surface image of the circuit board and identify and judge the obtained image. The flipping components I are used to flip the circuit boards that pass the detection. The cleaning mechanisms are used to remove dust and debris on the surface of the circuit boards and flip the circuit boards. Hereinafter, the printed circuit board is collectively referred to as the circuit board.

[0007] The detection mechanism includes a three-axis drive base and a camera. The camera is electrically connected to an identification and judgment module, and the identification and judgment module is used to obtain the captured image and identify wrinkles and dust on the surface of the circuit board.

[0008] The cleaning mechanism includes a processing box, a second flipping component and a cleaning component disposed inside the processing box. The processing box is used to prevent dust and debris from scattering when cleaning the circuit board. The second flipping component is used to clamp both ends of the circuit board and flip it. The cleaning component is used to clean the dust and debris on the surface of the circuit board;

[0009] The cleaning component includes a cylinder three and a cleaning part. The cleaning part includes a second connecting frame, an inner tube fixed to the second connecting frame, an outer tube bearing-connected to the inner tube, and bristles fixed to the outer tube. An air inlet cavity and an air outlet cavity are arranged inside the inner tube. The air inlet cavity and the air outlet cavity are respectively connected with a filter, a heating device and an air pump through pipelines;

[0010] Two groups of staggered air holes are formed on the inner tube. The two groups of air holes correspond to the air inlet cavity and the air outlet cavity respectively. Each group of air holes is provided with several. Two groups of cavities are arranged inside the outer tube. An air channel is formed on the outer tube. The air channel corresponds to the position of the air holes. A driving five is fixedly connected to the side part of the second connecting frame. 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

[0011] The cleaning part can realize self-cleaning inside the box body, dust and debris treatment of the circuit board, self-cleaning of the bristles, and at the same time can remove the wrinkles on the circuit board by stretching the circuit board after heating.

[0012] According to the above technical solution, the three-axis driving seat is fixed on the top of the detection table. Two groups of first connecting frames are fixedly connected to the side part of the three-axis driving seat. The camera is fixed to the bottom of the first connecting frame.

[0013] According to the above technical solution, the first flipping component includes a double-axis driving frame and a pneumatic claw. The double-axis driving frame is fixed on the top of the detection table. A driving six is fixedly connected to the top of the double-axis driving frame. The output end of the driving six is fixedly connected with a pneumatic claw, which can clamp the middle part of the circuit board and flip it, simplifying the flipping process.

[0014] According to the above technical solution, the processing box includes a box body and a movable plate. A flipping door is hinged to one side of the box body close to the conveying mechanism. Two groups of first empty slots are arranged inside the box body. The first empty slots are arranged on both sides of the flipping door. A first slider is arranged inside the first empty slot. The flipping door is in gear and rack transmission connection with the first slider. A first spring is fixedly connected to the bottom of the first slider. The bottom of the first spring is fixedly connected with the box body, which can realize the linkage opening and closing of the flipping door;

[0015] The movable plate is slidably connected to the box body. Two sets of empty slots two and a through slot are provided inside the movable plate. The through slot is located below the center of the movable plate. The empty slots two are arranged on the upper and lower sides of the through slot. A second spring is arranged in the empty slot two. The second spring is fixedly connected to the back plate. The other end of the second spring is fixedly connected to a sliding plate. A back plate is arranged in the through slot. The back plate is slidably connected to the movable plate. The sliding plate contacts the back plate, which can keep the movable plate, the back plate, and the sliding plate still in a complete plane, ensuring the self-cleaning inside the processing box. At the same time, it can avoid the scattering of dust when cleaning the circuit board, thereby avoiding affecting the qualified and untested circuit boards.

[0016] According to the above technical solution, the second flipping assembly includes a second slider and a first driver. The second slider is slidably connected to the box body through a limiting column. A first air cylinder is fixedly connected to the top of the second slider. The output end of the first air cylinder is fixedly connected to the back plate.

[0017] The first driver is fixed on the back plate. The output end of the first driver passes through the back plate and is fixedly connected to a first connecting block. Two sets of oppositely arranged second air cylinders are fixedly connected to one side of the first connecting block. The output end of the second air cylinder is fixedly connected to a second connecting block. A first sliding groove is provided on the opposite side of the two second connecting blocks. Two clamping blocks are arranged in the first sliding groove. The clamping blocks are slidably connected to the second connecting block. A pressure sensor is arranged on the opposite side of the two clamping blocks. A number of second drivers are fixedly connected to the top of the second connecting block. The output end of the second driver is connected to the two clamping blocks. The second flipping assembly can clamp both ends of the circuit board for flipping and can also stretch the circuit board to process the surface wrinkles of the circuit board.

[0018] According to the above technical solution, the third air cylinder is fixed on the side of the movable plate. The output end of the third air cylinder is fixedly connected to a third slider. The third slider slides in the box body through a limiting column. A fourth air cylinder is fixedly connected to the bottom of the third slider. The output end of the fourth air cylinder is fixedly connected to a third connecting block. A second sliding groove is provided on the third connecting block. The cleaning part is arranged in the second sliding groove. A third driver is fixedly connected to the third connecting block. The third driver is connected to the cleaning part by a gear-rack transmission connection; the second connecting frame is connected to the third driver by a gear-rack transmission connection.

[0019] According to the above technical solution, a fourth slider is slidably connected to the bottom inside the second connecting frame. A baffle is hinged to the bottom of the fourth slider. A bearing seat is slidably connected to the baffle. The bearing seat is connected to the output end of the fifth driver by a bearing. Under the resistance of the baffle, the dust on the brush hairs can be cleaned, realizing the self-cleaning of the brush hairs and reducing the cleaning times of the staff.

[0020] According to the above technical solution, a marking assembly is arranged on the left side of the cleaning mechanism. The marking assembly includes a three-axis moving frame and a marking head fixed to the side of the three-axis moving frame. The three-axis moving frame is fixed on the top of the detection table.

[0021] According to the above technical solution, receiving parts are arranged at both ends of the conveying mechanism. The receiving parts can perform loading and unloading at both the bottom and the bottom.

[0022] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: In the present invention, by providing a cleaning part, when the driving five drives the outer tube to rotate and the air pump is started to suck, it can realize purging, brush rolling, and dust suction on the surface of the circuit board to remove the dust on the surface of the circuit board; by providing a flipping assembly, on the basis of normally flipping the circuit board, when the flipping assembly clamps the circuit board from the conveying mechanism and drives the movable plate to move, it can perform self-cleaning inside the processing box in combination with the cleaning part; when the circuit board is entirely located inside the processing box, by introducing hot air into the cleaning part and combining with the flipping assembly to increase the stretching when clamping the circuit board, the wrinkles existing on the surface of the circuit board can be removed, thereby improving the appearance detection efficiency and quality of the printed circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The 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 to the present invention. In the drawings:

[0024] Figure 1 is the overall structural schematic diagram of the present invention;

[0025] Figure 2 is the partial structural schematic diagram of the present invention;

[0026] Figure 3 is the overall structural schematic diagram of the cleaning mechanism of the present invention;

[0027] Figure 4 is the internal structural schematic diagram of the cleaning mechanism of the present invention;

[0028] Figure 5 is the front-end sectional structural schematic diagram of the cleaning mechanism of the present invention;

[0029] Figure 6 is the Figure 5 magnified structural schematic diagram of area A in the present invention;

[0030] Figure 7 is the rear-end sectional structural schematic diagram of the cleaning mechanism of the present invention;

[0031] Figure 8 is the side-sectional structural schematic diagram of the cleaning mechanism of the present invention;

[0032] Figure 9 is the partial structural schematic diagram of the cleaning mechanism of the present invention;

[0033] Figure 10 is the side-sectional structural schematic diagram of the cleaning part of the present invention;

[0034] Figure 11 is the top-sectional structural schematic diagram of the cleaning part of the present invention;

[0035] In the figure: 1, inspection table; 2, conveying mechanism; 3, bracket;

[0036] 4, inspection mechanism; 41, three-axis drive base; 42, connecting frame one; 43, camera;

[0037] 5, first flipping assembly; 51, double-axis drive frame; 52, drive six; 53, air gripper;

[0038] 6, cleaning mechanism; 61, processing box; 611, box body; 612, flipping door; 613, first slider; 614, first spring; 615, movable plate; 616, second spring; 617, sliding plate; 618, back plate;

[0039] 62, second flipping assembly; 621, second slider; 622, first cylinder; 623, drive one; 624, second cylinder; 625, second connecting block; 626, clamping block; 627, drive two; 628, first connecting block;

[0040] 63, cleaning assembly; 631, third cylinder; 632, third slider; 633, fourth cylinder; 634, third connecting block; 635, drive three;

[0041] 7, cleaning part; 71, connecting frame two; 72, inner pipe; 73, outer pipe; 74, intake cavity; 75, exhaust cavity; 76, air hole; 77, air duct; 78, drive five; 79, brush hair; 710, fourth slider; 711, baffle; 712, cavity;

[0042] 8, marking assembly; 81, three-axis moving frame; 82, marking head; 9, storage part. Specific embodiments

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0044] Please refer to Figure 1 and Figure 2, the present invention provides a technical solution: an intelligent appearance detection device for printed circuit boards, including a detection table 1, a conveying mechanism 2 arranged on the top of the detection table 1, a number of brackets 3 fixed inside the conveying mechanism 2, a detection mechanism 4 arranged on one side of the conveying mechanism 2, and two sets of flipping components one 5, and two sets of cleaning mechanisms 6 arranged on the other side of the conveying mechanism 2. The flipping component one 5 and the cleaning mechanism 6 are arranged opposite to each other. The conveying mechanism 2 is used to convey the printed circuit boards to be detected. The printed circuit boards are hereinafter collectively referred to as circuit boards. The brackets 3 are used to fixedly clamp the circuit boards in the states of being detected and to be flipped. The brackets 3 correspond to the positions of the detection mechanism 4, the flipping component one 5, and the cleaning mechanism 6. The detection mechanism 4 is used to obtain the surface images of the circuit boards and identify and judge the obtained images. The flipping component one 5 is used to flip the circuit boards that pass the detection. The cleaning mechanism 6 is used to remove the dust and debris on the surface of the circuit boards and flip the circuit boards.

[0045] It should be noted that the conveying mechanism 2 uses a conveyor belt driven by a motor to convey the circuit boards; the brackets 3 are trays that use pneumatic lifting. The conveying mechanism 2 and the brackets 3 are existing structures and will not be elaborated here.

[0046] Specifically, referring to Figure 2 , the detection mechanism 4 includes a three-axis drive base 41 and a camera 43. The three-axis drive base 41 is fixed on the top of the detection table 1. Two sets of connecting frames one 42 are fixedly connected to the side of the three-axis drive base 41. The camera 43 is fixed at the bottom of the connecting frame one 42. The camera 43 is electrically connected to an identification and judgment module. The three-axis drive base 41 is used to drive the two cameras 43 to move synchronously forward and backward, left and right, and up and down. The camera 43 is used to photograph the upper and lower surfaces of the circuit boards. The identification and judgment module is used to obtain the photographed images and identify the wrinkles and dust on the surface of the circuit boards.

[0047] Specifically, referring to Figure 2 , the flipping component one 5 includes a two-axis drive frame 51 and a pneumatic claw 53. The two-axis drive frame 51 is fixed on the top of the detection table 1. A drive six 52 is fixedly connected to the top of the two-axis drive frame 51. The output end of the drive six 52 is fixedly connected to the pneumatic claw 53. The two-axis drive frame 51 is used to drive the cylinder to lift and move in the vertical direction of the conveying of the conveying mechanism 2. The drive six 52 is driven by a motor. When in use, the two-axis drive frame 51 drives the pneumatic claw 53 to move and lift along the direction perpendicular to the conveying of the conveying mechanism 2. The pneumatic claw 53 clamps the middle of the circuit board. The drive six 52 starts to rotate, driving the pneumatic claw 53 to rotate, so as to flip the circuit board clamped by the pneumatic claw 53.

[0048] Specifically, referring to Figures 3 - 4 , the cleaning mechanism 6 includes a processing box 61, a flipping component two 62 arranged inside the processing box 61, and a cleaning component 63. The processing box 61 is used to prevent the dust and debris from flying when cleaning the circuit boards. The flipping component two 62 is used to clamp both ends of the circuit board and flip it. The cleaning component 63 is used to clean the dust and debris on the surface of the circuit boards.

[0049] Furthermore, referring to 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 hinged to one side of the box body 611 close to the conveying mechanism 2. Two sets of first empty slots are arranged inside the box body 611, and the first empty slots are arranged on both sides of the flip door 612. A first slider 613 is arranged in the first empty slot. The flip door 612 is in gear-rack transmission connection with the first slider 613. A first spring 614 is fixedly connected to the bottom of the first slider 613, and the bottom of the first spring 614 is fixedly connected to the box body 611. When the flip door 612 is opened under an external force, the first slider 613 is driven to rise through gear-rack transmission, and at the same time, the first spring 614 is stretched. After the flip door 612 is released from the external force, under the pulling force of the first spring 614 and the self-weight of the first slider 613, the first slider 613 descends, so that the flip door 612 automatically closes;

[0050] Referring to Figure 7 , the movable plate 615 is slidably connected to the box body 611. Two sets of second empty slots and a through slot are formed inside the movable plate 615. The through slot is located below the center of the movable plate 615. The second empty slots are arranged on the upper and lower sides of the through slot. A second spring 616 is arranged in the second empty slot. The second spring 616 is fixedly connected to the back plate 618. The other end of the second spring 616 is fixedly connected to a sliding plate 617. A back plate 618 is arranged in the through slot. The back plate 618 is slidably connected to the movable plate 615. The sliding plate 617 is in contact with the back plate 618. When the back plate 618 moves up and down, the compression degrees of the two sets of second springs 616 change, so as to synchronously drive the two sets of sliding plates 617 to move up and down, so that the movable plate 615, the sliding plate 617, and the back plate 618 always maintain a complete plane.

[0051] Referring to Figure 4 and Figure 8 , the second flipping assembly 62 includes a second slider 621 and a first driver 623. The second slider 621 is slidably connected to the box body 611 through a limiting column. The second slider 621 is driven by a cylinder to slide left and right in the box body 611. A first cylinder 622 is fixedly connected to the top of the second slider 621, and the output end of the first cylinder 622 is fixedly connected to the back plate 618;

[0052] Driver 1 623 is fixed on the backplane 618. The output end of Driver 1 623 passes through the backplane 618 and is fixedly connected with Link Block 1 628. On the side of Link Block 1 628, two sets of oppositely arranged Cylinders 2 624 are fixedly connected. The output end of Cylinder 2 624 is fixedly connected with Link Block 2 625. On the opposite side of the two Link Blocks 2 625, a first chute is provided. In the first chute, two sets of clamping blocks 626 are arranged. The clamping blocks 626 are slidably connected with Link Block 2 625. On the opposite side of the two clamping blocks 626, a pressure sensor is provided. The pressure sensor adopts a dot matrix type. On the top of Link Block 2 625, several Drivers 2 627 are fixedly connected. Driver 2 627 adopts a motor combined with a bidirectional lead screw drive mode. The output end of Driver 2 627 is connected with the two clamping blocks 626. Driver 2 627 is used to drive the two clamping blocks 626 to clamp or loosen the circuit board.

[0053] In actual operation, Slide Block 2 621 slides back and forth to adjust the front and back positions of the clamping blocks 626 for clamping the circuit board; Cylinder 1 622 starts to expand and contract to drive the backplane 618 to rise and fall, so as to adjust the height of the two clamping blocks 626 when clamping the circuit board; Cylinder 2 624 expands and contracts to adjust the distance between the two Link Blocks 2 625 to fit different sizes of circuit boards; Driver 1 623 starts to rotate to drive Link Block 1 628 to rotate, so as to realize the flipping of the circuit board clamped by the two clamping blocks 626; The pressure sensor is used to detect the clamping force after the two clamping blocks 626 clamp the circuit board.

[0054] Reference Figure 3 、 Figure 4 and Figure 8 Refer to

[0055] Further, refer to Figures 8 - 11 , the cleaning component 63 includes Cylinder 3 631 and the cleaning part 7. Cylinder 3 631 is fixed on the side of the movable plate 615. The output end of Cylinder 3 631 is fixedly connected with Slide Block 3 632. Slide Block 3 632 slides in the box body 611 through the limit posts. At the bottom of Slide Block 3 632, Cylinder 4 633 is fixedly connected. The output end of Cylinder 4 633 is fixedly connected with Link Block 3 634. A second chute is provided on Link Block 3 634. The cleaning part 7 is arranged in the second chute. On Link Block 3 634, Driver 3 635 is fixedly connected. Driver 3 635 is connected with the cleaning part 7 by a gear-rack transmission.

[0056] Two sets of staggered air holes 76 are provided on the inner tube 72. The two sets of air holes 76 correspond to the air inlet chamber 74 and the air outlet chamber 75 respectively. Each set of air holes 76 is provided with several. Two sets of cavities 712 are arranged inside the outer tube 73. An air passage 77 is provided on the outer tube 73. The air passage 77 corresponds to the position of the air holes 76. A driving member five 78 is fixedly connected to the side of the connecting frame two 71. The output end of the driving member five 78 passes through the connecting frame two 71 and is connected to the outer tube 73 by a gear transmission method;

[0057] A slider four 710 is slidably connected to the bottom inside the connecting frame two 71. A baffle 711 is hinged to the bottom of the slider four 710. A bearing seat is slidably connected to the baffle 711. The bearing seat is connected to the output end of the driving member five 78 by a bearing. After the staff adjusts the position of the slider four 710 so that the baffle 711 can contact the brush hair 79, the position of the slider four 710 is fixed by using a fastener.

[0058] In actual operation, the telescopic movement of the cylinder three 631 drives the slider three 632 to move back and forth inside the box body 611 to adjust the front and back positions of the cleaning part 7 inside the box body 611; the cylinder four 633 expands and contracts to adjust the lifting height of the cleaning part 7; the driving member three 635 is started to adjust the left and right positions of the cleaning part 7 inside the box body 611; the air pump connected to the air inlet chamber 74 is started to introduce gas into the air inlet chamber 74, which can blow away the dust and debris on the surface of the clamped circuit board; the air pump connected to the air outlet chamber 75 pumps out the air inside the air outlet chamber 75, which can recover the blown dust and debris, achieving the effect of dust removal; the driving member five 78 is started, and the outer tube 73 is driven to rotate through gear transmission, which can remove the dust and debris on the surface of the clamped circuit board, achieving the effect of dust removal; when the rotating brush hair 79 contacts the baffle 711, the dust on the brush hair 79 can be removed under the action of the resistance of the baffle 711, achieving the effect of self-cleaning of the brush hair 79.

[0059] Please refer to 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 moving frame 81 and a marking head 82 fixed to the side of the three-axis moving frame 81. The three-axis moving frame 81 is fixed to the top of the detection table 1. The three-axis moving frame 81 is used to drive the marking head 82 to move back and forth, left and right, and up and down. The marking head 82 is used to mark the abnormal areas on the surface of the circuit board. The abnormal areas include the wrinkled areas and the areas with dust and debris.

[0060] Receiving parts 9 are arranged at both ends of the conveying mechanism 2. The receiving parts 9 can perform loading and unloading at both the bottom and the bottom. The receiving parts 9 are used for receiving the circuit boards before and after loading and unloading. The receiving parts 9 are of existing structures and will not be elaborated too much.

[0061] The detection steps of the intelligent appearance detection device for circuit boards are as follows:

[0062] Step 1: The right-end bracket 3 removes the circuit board from the storage part 9 and places it on the conveying mechanism 2 for forward conveyance;

[0063] Step 2: Perform appearance inspection and adjustment. The inspection mechanism 4 acquires the surface image of the circuit board, and the recognition and judgment module recognizes the wrinkles and dust on the surface of the circuit board. The flipping component 1 5 flips the circuit board that passes the inspection, and the cleaning mechanism 6 processes the circuit board that fails the inspection, including removing the dust and debris on the surface of the circuit board, stretching the circuit board, and flipping the circuit board;

[0064] Specifically, when the recognition and judgment module recognizes that the surface of the circuit board captured by the camera 43 is smooth and dust-free, it is considered to pass the inspection, and in other cases, it fails the inspection and is processed by the cleaning mechanism 6;

[0065] It should be noted that the surface captured by the left camera 43 is called the front side, and the surface captured by the right camera 43 after flipping is called the back side; the forward conveyance direction of the conveying mechanism 2 is from right to left.

[0066] When the front side of the circuit board passes the inspection, the right flipping component 1 5 flips the circuit board and then inspects the back side of the circuit board. When the back side also passes the inspection, the left flipping component 1 5 flips the circuit board again so that the front side of the circuit board faces up;

[0067] When the front side of the circuit board fails the inspection, the cleaning mechanism 6 processes the circuit board;

[0068] Specifically, when the recognition and judgment module recognizes that there is dust and wrinkles on the front side of the circuit board, the recognition and judgment module further recognizes and obtains the area ratio of the dust area and the area ratio of the wrinkle area. The area ratio of the dust area is denoted as a, and the area ratio of the wrinkle area is denoted as b. A threshold for the area ratio is set in the recognition and judgment module, and the threshold is denoted as N, and N is specifically set according to actual needs.

[0069] Case 1: When a ≥ N, the inside of the box body 611 is self-cleaned, and the cleaning part 7 performs rolling cleaning without flipping and then re-detection: ① The cleaning part 7 on the cleaning component 63 is close to the side of the inside of the box body 611 near the conveying mechanism 2 and is located above the flipping door 612; ② The flipping component two 62 clamps the circuit board. When the cylinder pushes the slider two 621 to slide towards the conveying mechanism 2, the movable plate 615 also moves towards the conveying mechanism 2 along with the slider two 621, discharging the gas inside the box body 611. Meanwhile, the driving part five 78 starts to drive the outer tube 73 to rotate clockwise by a small angle, so that part of the air passage 77 corresponding to the air outlet cavity 75 faces downwards, that is, the air passage 77 is still in communication with the air hole 76, but the air passage 77 is in a downward state; ③ The air pump connected to the air outlet cavity 75 starts to pump out the air inside the air outlet cavity 75. At this time, the pumped gas is the gas discharged from the inside of the box body 611, achieving the effect of self-cleaning and dust removal inside the box body 611; ④ When clamping the circuit board into the box body 611, maintain the above state until the circuit board completely enters the box body 611 and the flipping door 612 is closed; ⑤ The driving part five 78 starts to drive the outer tube 73 to rotate circumferentially, so that the brush hair 79 removes the dust and debris on the surface of the circuit board. Meanwhile, the air pump connected to the air inlet cavity 74 starts to introduce gas into the air inlet cavity 74, which can blow away the dust and debris on the surface of the circuit board. The air pump connected to the air outlet cavity 75 pumps out the air inside the air outlet cavity 75 to recover the blown dust and debris, achieving the effect of dust removal; ⑥ After the dust removal is completed, when the flipping component two 62 places the circuit board back on the conveying mechanism 2, maintain the state of step ③ above at the same time. The conveying mechanism 2 conveys reversely, and is re-photographed by the left camera 43, and this step is repeated.

[0070] Case 2: When a < N, the inside of the box body 611 is self-cleaned, and the cleaning part 7 flips after rolling cleaning: The processing method is based on Case 1, and step ⑥ is replaced by the flipping component two 62 clamping both ends of the circuit board and flipping the circuit board. Then, when placing the circuit board back on the conveying mechanism 2, maintain the state of step ③ above at the same time. At this time, the conveying mechanism 2 is still conveying forward;

[0071] 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;

[0072] Case 4: When b < N, the circuit board is stretched and then detected: The flipping component two 62 clamps the circuit board and enters the interior of the box body 611. When clamping the circuit board, the clamping force detected by the pressure sensor remains within the set range. The specific set range is set manually. At the same time, the driver five 78 starts to drive the outer tube 73 to rotate counterclockwise by a small angle, so that part of the air passage 77 corresponding to the air inlet chamber 74 faces downward, that is, the air passage 77 is still in communication with the air hole 76, but the air passage 77 is in a downward state. At the same time, the air pump connected to the air inlet chamber 74 starts, and the heating device heats up, and hot air is introduced into the air inlet chamber 74 to heat the surface of the circuit board; then the cylinder two 624 extends by a set elongation amount to stretch the clamped circuit board. The specific elongation amount is set manually; after the stretching is completed, the flipping component two 62 places the circuit board back on the conveying mechanism 2, and the conveying mechanism 2 conveys reversely, and is re-photographed by the left camera 43, and this step is repeated.

[0073] It should be noted that when there are both dust and wrinkles on the front side of the circuit board, Case 1, Case 2 and Case 4 can be carried out synchronously; when Case 3 occurs, if Case 1 and Case 2 occur simultaneously, it is still processed in the manner of Case 3, and Case 1 and Case 2 are not processed; in this step, the repeated detection is only carried out once. If the repeated detection is still unqualified, the abnormal area is marked by the marking component 8; after the front side of the circuit board is detected, the reverse side detection method is the same as the front side detection method.

[0074] Step 3: The marking component 8 marks the abnormal area on the surface of the circuit board.

[0075] Step 4: The left end bracket 3 lifts the detected circuit board into the storage part 9 for storage.

[0076] Through the above steps, the 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, improving the appearance detection efficiency and quality of the printed circuit board.

[0077] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0078] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An intelligent appearance detection device for a printed circuit board, comprising a detection table (1), a conveying mechanism (2) arranged on the top of the detection table (1), a plurality of brackets (3) fixed inside the conveying mechanism (2), a detection mechanism (4) arranged on one side of the conveying mechanism (2), and two groups of flipping components one (5), and two groups of cleaning mechanisms (6) arranged on the other side of the conveying mechanism (2), characterized in that, The flipping component one (5) and the cleaning mechanism (6) are arranged opposite 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. 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) includes a three-axis drive base (41) and a camera (43). The camera (43) is electrically connected to an identification and judgment module, and the identification and judgment module is used to obtain the captured image and identify wrinkles and dust on the surface of the circuit board. The cleaning mechanism (6) includes a processing box (61), a flipping component two (62) and a cleaning component (63) arranged inside the processing box (61). The processing box (61) is used to prevent dust and debris from flying during the cleaning of the circuit board. The flipping component two (62) is used to clamp both ends of the circuit board and flip it. The cleaning component (63) is used to clean dust and debris on the surface of the circuit board. The processing box (61) includes a box body (611) and a movable plate (615). A flipping door (612) is hinged on one side of the box body (611) close to the conveying mechanism (2). Two groups of empty slots one are arranged inside the box body (611). The empty slots one are arranged on both sides of the flipping door (612). A slider one (613) is arranged in the empty slot one. The flipping door (612) is in gear and rack transmission connection with the slider one (613). The bottom of the slider one (613) is fixedly connected with a spring one (614), and the bottom of the spring one (614) is fixedly connected with the box body (611). Two groups of empty slots two and a through slot are formed inside the movable plate (615). A back plate (618) is arranged in the through slot. The flipping component two (62) includes a slider two (621) and a drive one (623). The drive one (623) is fixed on the back plate (618). The output end of the drive one (623) passes through the back plate (618) and is fixedly connected with a connecting block one (628). Two groups of relatively arranged cylinders two (624) are fixedly connected to the side of the connecting block one (628). The output end of the cylinder two (624) is fixedly connected with a connecting block two (625). A chute one is formed on the opposite side of the two groups of connecting blocks two (625). Two groups of clamping blocks (626) are arranged in the chute one. The clamping blocks (626) are slidably connected with the connecting block two (625). A pressure sensor is arranged on the opposite side of the two groups of clamping blocks (626). A number of drives two (627) are fixedly connected to the top of the connecting block two (625), and the output end of the drive two (627) is connected with the two groups of clamping blocks (626). The cleaning component (63) includes a cylinder three (631) and a cleaning part (7). The cleaning part (7) includes a connecting frame two (71), an inner tube (72) fixed on the connecting frame two (71), an outer tube (73) bearing-connected with the inner tube (72), and bristles (79) fixed on the outer tube (73). 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 with a filter, a heating device and an air pump through pipelines. Two sets of staggered air holes (76) are formed in the inner tube (72). The two sets of air holes (76) correspond to the air inlet cavity (74) and the air outlet cavity (75) respectively. Each set of air holes (76) is provided with a plurality of them. Two cavities (712) are arranged inside the outer tube (73). An air passage (77) is formed in the outer tube (73). The air passage (77) corresponds to the position of the air holes (76). A fifth driver (78) is fixedly connected to the side of the second connecting frame (71). The output end of the fifth driver (78) passes through the second connecting frame (71) and is connected to the outer tube (73) by a gear transmission method.

2. The intelligent appearance detection device for printed circuit boards according to claim 1, wherein, The three-axis driving seat (41) is fixed to the top of the inspection table (1). Two first connecting frames (42) are fixedly connected to the side of the three-axis driving seat (41). The camera (43) is fixed to the bottom of the first connecting frame (42).

3. The intelligent appearance detection device for printed circuit boards according to claim 2, wherein, The first flipping assembly (5) includes a two-axis driving frame (51) and a pneumatic claw (53). The two-axis driving frame (51) is fixed to the top of the inspection table (1). A sixth driver (52) is fixedly connected to the top of the two-axis driving frame (51). The output end of the sixth driver (52) is fixedly connected to the pneumatic claw (53).

4. An intelligent appearance detection device for printed circuit boards according to claim 3, characterized in that, The movable plate (615) is slidably connected to the box body (611). The through groove is located below the center of the movable plate (615). The second empty grooves are arranged on the upper and lower sides of the through groove. A second spring (616) is arranged in the second empty grooves. The second spring (616) is fixedly connected to the back plate (618). The other end of the second spring (616) is fixedly connected to a sliding plate (617). The back plate (618) is slidably connected to the movable plate (615). The sliding plate (617) contacts the back plate (618).

5. An intelligent appearance detection device for printed circuit boards according to claim 4, characterized in that, The second slider (621) is slidably connected to the box body (611) through a limiting column. A first cylinder (622) is fixedly connected to the top of the second slider (621). The output end of the first cylinder (622) is fixedly connected to the back plate (618).

6. The intelligent appearance detection device for printed circuit boards according to claim 5, wherein, The third cylinder (631) is fixed to the side of the movable plate (615). The output end of the third cylinder (631) is fixedly connected to a third slider (632). The third slider (632) slides in the box body (611) through a limiting column. A fourth cylinder (633) is fixedly connected to the bottom of the third slider (632). The output end of the fourth cylinder (633) is fixedly connected to a third connecting block (634). A second chute is formed in the third connecting block (634). The cleaning part (7) is arranged in the second chute. A third driver (635) is fixedly connected to the third connecting block (634). The third driver (635) is connected to the cleaning part (7) by a gear-rack transmission; the second connecting frame (71) is connected to the third driver (635) by a gear-rack transmission.

7. The intelligent appearance detection device for printed circuit boards according to claim 6, wherein, A fourth slider (710) is slidably connected to the inner bottom of the second connecting frame (71). A baffle (711) is hinged to the bottom of the fourth slider (710). A bearing seat is slidably connected to the baffle (711). The bearing seat is in bearing connection with the output end of the fifth driver (78).

8. An intelligent appearance detection device for printed circuit boards according to claim 7, characterized in that, A marking component (8) is arranged on the left side of the cleaning mechanism (6). The marking component (8) includes a three-axis moving frame (81) and a marking head (82) fixed to the side of the three-axis moving frame (81). The three-axis moving frame (81) is fixed to the top of the detection table (1).

9. An intelligent appearance detection device for printed circuit boards according to claim 8, characterized in that, Receiving parts (9) are arranged at both ends of the conveying mechanism (2). The receiving parts (9) adopt a structure that can perform loading and unloading at both the top and the bottom.

10. An intelligent appearance detection device for printed circuit boards according to claim 9, characterized in that, The detection steps of the intelligent appearance detection device for circuit boards are as follows: Step 1: The right-end bracket (3) takes the circuit board from the receiving part (9) and places it on the conveying mechanism (2) for forward conveyance. Step 2: Appearance detection and adjustment are carried out. The detection mechanism (4) acquires the surface image of the circuit board, and the recognition and judgment module recognizes wrinkles and dust on the surface of the circuit board. The first flipping component (5) flips the circuit board that has passed the detection, and the cleaning mechanism (6) processes the circuit board that fails the detection, including removing dust debris on the surface of the circuit board, stretching the circuit board, and flipping the circuit board. 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 detected circuit board into the receiving part (9) for storage.

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