Flexible circuit board defect automatic detection device

Abstract

The utility model relates to an automatic defect detection device for a flexible circuit board, which comprises a first conveyor and a second conveyor, a detection platform is arranged between the first conveyor and the second conveyor, a clamping mechanism is arranged at the side part of the detection platform, a detection bracket is arranged above the detection platform, and an image acquisition mechanism is arranged at the upper end of the detection bracket. The light source is fixed to the detection support, the detection platform comprises a roller support and a plurality of supporting rollers, a plurality of U-shaped grooves are formed in the side portion of the roller support, the supporting rollers rotate in the U-shaped grooves, the tops of the supporting rollers are flush with the top of the detection platform, the supporting rollers are provided with driving motors, and the clamping mechanism comprises an electric guide rail, a connecting plate and a pressing plate. The pressing plate is located above the detection platform; and the control module comprises a key module, a controller and a position sensor. According to the utility model, the detection platform is combined with the clamping mechanism to complete leveling of the flexible circuit board through pressure, so that defect detection of the flexible circuit board is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to flexible circuit board production detection technical field, concretely relates to a kind of flexible circuit board defect automation detection device. BACKGROUND

[0002] Flexible circuit board's manufacturing process is complex, each process can cause defect, so flexible circuit board defect detection becomes an important link in its production process, current detection method is mostly artificial visual inspection, worker's work intensity is big, accuracy is low and personal subjective reason leads to the detection result of product different.

[0003] With the development of science and technology, image deep learning flaw detection technology is applied to circuit board flaw detection, image deep learning flaw detection technology is an advanced method for automatically identifying product defects using artificial intelligence, the core is to learn flaw features through convolutional neural network (CNN), to realize efficient quality inspection. When operating, the measured equipment is photographed, and then image processing is carried out by computer, and image deep learning flaw detection technology is used to automatically detect circuit board flaws.

[0004] But flexible circuit board has certain flexibility, when placing, it will be curled, resulting in poor image shooting effect, so misjudgment is easy to occur.

[0005] Therefore, a flexible circuit board defect automation detection device is needed, which can solve the problem of flexible circuit board curling and realize effective flaw detection. SUMMARY

[0006] The utility model discloses to solve the problem that flexible circuit board curls due to material quality and affects image deep learning flaw detection technology accurate detection. A kind of flexible circuit board defect automation detection device is proposed, detection platform is set up, and the flattening of flexible circuit board is completed by pressure through clamping mechanism, and the transmission after the detection of flexible circuit board is completed, to realize the flaw detection of flexible circuit board.

[0007] To achieve the above purpose, the utility model provides a kind of flexible circuit board defect automation detection device, including conveying mechanism, feeding mechanism, light source and image acquisition mechanism, the image acquisition mechanism is connected with host computer, conveying mechanism includes first conveyor and second conveyor, detection platform is provided between the first conveyor and the second conveyor, the side of the detection platform is provided with clamping mechanism, the upper portion of the detection platform is provided with detection support, the upper end of the detection support is provided with the image acquisition mechanism, and the light source is fixed with detection support;

[0008] The detection platform comprises a roller support and a plurality of supporting rollers, the roller support is in a square structure, a plurality of U-shaped grooves are arranged in a linear array on the side of the roller support, the supporting rollers are arranged in the U-shaped grooves, the supporting rollers rotate in the U-shaped grooves, and the top of the supporting rollers is flush with the top of the detection platform;

[0009] The plurality of supporting rollers are connected by a belt, and one of the supporting rollers is provided with a driving motor.

[0010] The detection support is in a square frame structure, the upper part of the lower end surface of the detection support is fixed to the bottom surface of the roller support, and the upper end of the detection support is provided with a mounting seat for fixing an image acquisition mechanism.

[0011] The clamping mechanism comprises an electric guide rail, a connecting plate and a pressing plate, the connecting plate is fixedly arranged on the sliding block of the electric guide rail, and the connecting plate and the pressing plate are fixed by bolts, the pressing plate is a square plate made of colorless glass, and the pressing plate is located above the detection platform.

[0012] The conveying mechanism, the feeding mechanism, the light source, the driving motor and the electric guide rail are all connected with a control module, and the control module comprises a key module, a controller and a position sensor.

[0013] Further, the detection platform further comprises side plates and supporting legs, the side plates are arranged on both sides of the roller support, bearings are arranged on both ends of the supporting rollers on the two side plates, the side plates are fixed to the roller support, and the supporting rollers are rotatably connected to the roller support through the bearings.

[0014] The supporting legs are arranged at the corners of the bottom surface of the roller support.

[0015] The side plates and the supporting legs make the detection platform modular, so that the detection platform is combined with other equipment conveniently. The side plates make the plurality of supporting rollers relatively fixed, so that the stability of the equipment in operation is improved.

[0016] Further, the electric guide rail is longitudinally arranged, the electric guide rail is fixed to the ground, the connecting plate is in a strip-shaped structure, the connecting plate and the sliding block are in an integrated structure, a horizontal groove in a linear array is arranged on the connecting plate, the pressing plate is provided with a mounting frame, the mounting frame is in a character-shaped structure, the middle part of the mounting frame is fixed to the pressing plate, the side edges of the mounting frame are arranged in the horizontal groove, and the mounting frame and the connecting plate are fixed by bolts.

[0017] The mounting frame is arranged to protect the pressing plate, and the linear horizontal groove facilitates the fixing and dismounting of the pressing plate. The mounting frame facilitates the maintenance of the pressing plate.

[0018] Further, the mounting seat is in a square structure with an inner hollow, a circular through hole is arranged in the middle part of the mounting seat, and the image acquisition mechanism is arranged in the mounting seat.

[0019] The mounting seat is embedded into the top end of the detection support, and the side of the mounting seat is fixed to the mounting seat by bolts;

[0020] The position sensor comprises a distance measuring sensor and an infrared detection sensor, and the distance measuring sensor is arranged corresponding to the mounting frame;

[0021] The infrared detection sensor is arranged close to the image acquisition mechanism, the distance measuring sensor and the infrared detection sensor are arranged in the mounting seat, the mounting seat is provided with a detection hole corresponding to the distance measuring sensor and the infrared detection sensor at the bottom, and the mounting direction of the distance measuring sensor and the infrared detection sensor is perpendicular to the mounting frame;

[0022] The output ends of the distance measuring sensor and the infrared detection sensor are connected to the input end of the controller.

[0023] The mounting seat is used for protecting the image acquisition mechanism, the distance measuring sensor and the infrared detection sensor, and in addition, the design of the mounting seat facilitates disassembly and assembly, thereby providing convenience for maintenance.

[0024] Further, the light source comprises a ring-shaped light source and two side light sources;

[0025] The image acquisition mechanism comprises a face array camera and a telecentric lens, the ring-shaped light source is fixed on the mounting seat, and the ring-shaped light source surrounds the telecentric lens;

[0026] The two side light sources are respectively fixed on the two sides of the detection support, and the two side light sources respectively form a 30° angle with the face array camera;

[0027] The side light sources and the ring-shaped light source are respectively electrically connected to the controller.

[0028] The ring-shaped light source and the side light source emit AOI light sources of different wave bands. The side light source and the ring-shaped light source are arranged to irradiate the defects of the product, so as to make the image clear.

[0029] Further, the controller comprises a PLC controller, the first conveyor and the second conveyor each comprise a belt conveyor, the belt conveyor is provided with a motor, the driving motor, the motor and the motor of the electric guide rail are all servo motors, the servo motor is provided with a frequency converter, the frequency converter is in communication connection with the PLC controller, and the servo motor is connected to the power supply through the frequency converter;

[0030] The key module comprises a plurality of keys, and the plurality of keys are respectively connected to the input end of the PLC controller;

[0031] The PLC controller is in communication connection with an HMI module.

[0032] The PLC controller cooperates with the position sensor to provide a hardware basis for automatic control.

[0033] The utility model discloses the beneficial effect of the utility model is:

[0034] 1. The utility model solves the problem of flexible circuit board curling. The lifting of the connecting plate and the pressing plate is controlled through the electric guide rail. When the pressing plate is lowered, the flexible circuit board that may curl on the detection platform can be flattened by a certain pressure, ensuring that the flexible circuit board remains flat during detection, greatly improving the image shooting effect, effectively avoiding the problem of unclear image shooting and misjudgment caused by circuit board curling, and significantly improving the accuracy of detection.

[0035] 2. The utility model realizes automatic detection of defects of the flexible circuit board. The controller controls the feeding mechanism to place the flexible circuit board on the first conveyor, and the first conveyor sends the flexible circuit board to the detection platform, and then the detection platform sends the flexible circuit board to the second conveyor. The infrared detection sensor can detect the position of the flexible circuit board. When the flexible circuit board reaches the position of the infrared detection sensor, the PLC controller controls the driving motor to stop, and the flexible circuit board stops on the detection platform. Then the PLC controller controls the electric guide rail to slowly contact the pressing plate with the flexible circuit board, and flattens the flexible circuit board. At the same time, the distance measuring sensor can monitor the distance between the pressing plate and the flexible circuit board. The PLC controller controls the electric guide rail to stop, the image acquisition mechanism acquires the picture of the measured flexible circuit board, and the host computer detects. Then the PLC controller controls the electric guide rail to stop and reset, and controls the driving motor to work to send the flexible circuit board to the second conveyor to complete the detection. The detection efficiency is greatly improved, manual intervention is reduced, and the labor intensity of workers is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 It is a structure diagram of the utility model one kind of flexible circuit board defect automatic detection device;

[0037] Figure 2 It is a structure diagram of the utility model one kind of flexible circuit board defect automatic detection device;

[0038] Figure 3 It is a structure diagram of the utility model one kind of flexible circuit board defect automatic detection device;

[0039] Figure 4 It is a circuit diagram of the utility model one kind of flexible circuit board defect automatic detection device.

[0040] Reference numerals: 1. Feeding mechanism; 2. Image acquisition mechanism; 3. First conveyor; 4. Second conveyor; 5. Detection bracket; 6. Roller bracket; 7. Support roller; 8. U-shaped groove; 9. Drive motor; 10. Mounting base; 11. Electric guide rail; 12. Connecting plate; 13. Pressure plate; 14. Controller; 15. Side plate; 16. Mounting frame; 17. Distance sensor; 18. Infrared detection sensor; 19. Ring light source; 20. Side light source. Detailed Implementation

[0041] Example 1

[0042] like Figures 1-4 As shown, an automated defect detection device for flexible circuit boards includes a conveying mechanism, a feeding mechanism 1, a light source, and an image acquisition mechanism 2. The image acquisition mechanism 2 is communicatively connected to a host computer. The conveying mechanism includes a first conveyor 3 and a second conveyor 4. A detection platform is provided between the first conveyor 3 and the second conveyor 4. A clamping mechanism is provided on the side of the detection platform. A detection bracket 5 is provided above the detection platform. The image acquisition mechanism 2 is provided at the upper end of the detection bracket 5. The light source is fixed to the detection bracket 5.

[0043] The detection platform includes a roller support 6 and multiple support rollers 7. The roller support 6 has a square structure, and multiple U-shaped grooves 8 are arranged in a straight line on the side of the roller support 6. The support rollers 7 are arranged inside the U-shaped grooves 8. The support rollers 7 rotate inside the U-shaped grooves 8, and the top of the support rollers 7 is flush with the top of the detection platform.

[0044] The plurality of support rollers 7 are connected by belts, and one of the support rollers 7 is equipped with a drive motor 9;

[0045] The detection bracket 5 has a square frame structure. The upper part of the lower end face of the detection bracket 5 is fixed to the bottom surface of the roller bracket 6. The upper end of the detection bracket 5 is provided with a mounting base 10, which is used to fix the image acquisition mechanism 2.

[0046] The clamping mechanism includes an electric guide rail 11, a connecting plate 12, and a pressure plate 13. The connecting plate 12 is fixedly mounted on the slider of the electric guide rail 11. The connecting plate 12 and the pressure plate 13 are fixed together by bolts. The pressure plate 13 is a square plate made of colorless glass and is located above the detection platform.

[0047] The conveying mechanism, the feeding mechanism 1, the light source, the drive motor 9, and the electric guide rail 11 are all connected to a control module. The control module includes a button module, a controller 14, and a position sensor.

[0048] The detection platform further comprises side plates 15 and legs, the side plates 15 are arranged on both sides of the roller support 6, bearings are arranged on both ends of the support roller 7 corresponding to the side plates 15, the side plates 15 are fixed with the roller support 6, and the support roller 7 is rotationally connected with the roller support 6 through the bearings.

[0049] The legs are arranged at the corners of the bottom surface of the roller support 6.

[0050] The electric guide rail 11 is arranged longitudinally, the electric guide rail 11 is fixed with the ground, the connecting plate 12 is in a long strip structure, the connecting plate 12 is in an integrated structure with the sliding block, a horizontal groove in the shape of a Chinese character is arranged on the connecting plate 12, the pressing plate 13 is provided with a mounting frame 16, the mounting frame 16 is in a character-shaped structure, the middle part of the mounting frame 16 is fixed with the pressing plate 13, the side edges of the mounting frame 16 are arranged in the horizontal groove, and the mounting frame 16 and the connecting plate 12 are fixed through bolts.

[0051] The mounting seat 10 is in a square structure with an inner cavity, a circular through hole is arranged in the middle part of the mounting seat 10, and the image acquisition mechanism 2 is arranged in the mounting seat 10;

[0052] The mounting seat 10 is embedded in the top end of the detection support 5, and the side part of the mounting seat 10 is fixed with the mounting seat 10 through bolts;

[0053] The position sensor comprises a distance measuring sensor 17 and an infrared detection sensor 18, and the distance measuring sensor 17 is arranged corresponding to the mounting frame 16;

[0054] The infrared detection sensor 18 is arranged close to the image acquisition mechanism 2, the distance measuring sensor 17 and the infrared detection sensor 18 are arranged in the mounting seat 10, detection holes are arranged in the bottom part of the mounting seat 10 corresponding to the distance measuring sensor 17 and the infrared detection sensor 18, and the installation direction of the distance measuring sensor 17 and the infrared detection sensor 18 is perpendicular to the mounting frame 16;

[0055] The output ends of the distance measuring sensor 17 and the infrared detection sensor 18 are connected with the input end of the controller 14.

[0056] The light source comprises a ring-shaped light source 19 and two side light sources 20;

[0057] The image acquisition mechanism 2 comprises a face array camera and a telecentric lens, the ring-shaped light source 19 is fixed on the mounting seat 10, and the ring-shaped light source 19 surrounds the telecentric lens;

[0058] The two side light sources 20 are respectively fixed with both sides of the detection support 5, and the two side light sources 20 respectively form an included angle of 30° with the face array camera.

[0059] The side light sources 20 and the ring-shaped light source 19 are electrically connected with the controller 14 respectively.

[0060] The controller 14 comprises a PLC controller, the first conveyor 3 and the second conveyor 4 each comprise a belt conveyor, the belt conveyor is provided with a motor, the driving motor 9, the motor and the motor of the electric guide rail 11 are all servo motors, the servo motor is provided with a frequency converter, the frequency converter is in communication connection with the PLC controller, and the servo motor is connected with the power supply through the frequency converter;

[0061] The key module comprises a plurality of keys, and the plurality of keys are connected with the input end of the PLC controller respectively.

[0062] The PLC controller is in communication connection with an HMI module. The feeding mechanism 1 comprises an X-axis moving mechanism, a Y-axis moving mechanism and a suction mechanism, the Y-axis moving mechanism is fixed on the X-axis moving mechanism, and the X-axis moving mechanism and the Y-axis moving mechanism are both electric guide rails, and the suction mechanism is fixedly arranged on the sliding block of the Y-axis moving mechanism.

[0063] The X-axis moving mechanism and the Y-axis moving mechanism are also driven by servo motors, and the negative pressure fan is connected with the PLC controller.

[0064] During operation, the control instruction is sent through the HMI module, the PLC controller controls the X-axis moving mechanism to move to the position of stacking the flexible circuit board, then controls the Y-axis moving mechanism to move downwards to the flexible circuit board, the PLC controller controls the negative pressure fan to work and suck the flexible circuit board, the PLC controller controls the Y-axis moving mechanism to reset, controls the X-axis moving mechanism to drive the Y-axis moving mechanism to the upper portion of the first conveyor 2, the PLC controller controls the Y-axis moving mechanism to move downwards, the PLC controller controls the negative pressure fan to be powered off, and the flexible circuit board falls on the first conveyor 3.

[0065] The PLC controller controls the motor to work, and the flexible circuit board is conveyed to the detection platform on the first conveyor 3. The PLC controller controls the driving motor 9 to work, and the flexible circuit board moves until the flexible circuit board is located below the image acquisition mechanism 2. At this time, the infrared light emitted by the infrared detection sensor 18 is blocked by the flexible circuit board, the infrared detection sensor 18 has no output, the PLC controller controls the driving motor 9 to stop working, and the supporting roller 7 stops rotating. Then the PLC controller controls the slider of the electric guide rail 11 to descend, and then the connecting plate 12 and the mounting frame 16 drive the pressing plate 13 to descend. The pressing plate 13 is slowly pressed down, so that the flexible circuit board is gradually stretched and flattened. The distance measuring sensor 17 always detects the distance from the mounting frame 16 to the detection point (the installation position of the distance measuring sensor 17). The first distance threshold value is written in the PLC controller. When the first distance threshold value is reached, the PLC controller controls the electric guide rail 11 to stop working. The PLC controller sends a signal to the upper computer, and the upper computer controls the image acquisition mechanism 2 to shoot the photo of the flexible circuit board. During the operation, the annular light source 19 and the side light source 20 are always in working state. After shooting, the upper computer sends a signal to the PLC controller, and the PLC controller controls the electric guide rail 11 to reset. During the period, the distance measuring sensor 17 detects the distance from the mounting frame 16 to the detection point. The second distance threshold value is set. When the second distance threshold value is reached, the PLC controller controls the electric guide rail 11 to stop working. At this time, the pressing plate 13 is away from the detection platform. The PLC controller controls the driving motor 9 to work, and the multiple supporting rollers 7 rotate to convey the detected flexible circuit board to the second conveyor 4. The second conveyor 4 conveys the flexible circuit board outward.

[0066] The above-described embodiments are only preferred embodiments of the present application, and are not intended to limit the scope of the application. Any equivalent changes or modifications made in accordance with the structure, features and principles of the application should be included in the scope of the application.

Claims

1. An automated defect detection device for flexible circuit boards, comprising a conveying mechanism, a feeding mechanism (1), a light source, and an image acquisition mechanism (2), wherein the image acquisition mechanism (2) is communicatively connected to a host computer, characterized in that, The conveying mechanism includes a first conveyor (3) and a second conveyor (4). A detection platform is provided between the first conveyor (3) and the second conveyor (4). A clamping mechanism is provided on the side of the detection platform. A detection bracket (5) is provided above the detection platform. The image acquisition mechanism (2) is provided at the upper end of the detection bracket (5). The light source is fixed to the detection bracket (5). The detection platform includes a roller support (6) and multiple support rollers (7). The roller support (6) has a square structure. Multiple U-shaped grooves (8) are arranged in a straight line on the side of the roller support (6). The support rollers (7) are arranged inside the U-shaped grooves (8). The support rollers (7) rotate inside the U-shaped grooves (8), and the top of the support rollers (7) is flush with the top of the detection platform. The multiple support rollers (7) are connected by belts, and one of the support rollers (7) is provided with a drive motor (9). The detection bracket (5) has a square frame structure. The upper part of the lower end face of the detection bracket (5) is fixed to the bottom surface of the roller bracket (6). The upper end of the detection bracket (5) is provided with a mounting seat (10), which is used to fix the image acquisition mechanism (2). The clamping mechanism includes an electric guide rail (11), a connecting plate (12) and a pressure plate (13). The connecting plate (12) is fixedly mounted on the slider of the electric guide rail (11). The connecting plate (12) and the pressure plate (13) are fixed by bolts. The pressure plate (13) is a square plate made of colorless glass and is located above the detection platform. The conveying mechanism, the feeding mechanism (1), the light source, the drive motor (9) and the electric guide rail (11) are all connected to a control module. The control module includes a button module, a controller (14) and a position sensor.

2. The automated defect detection device for flexible circuit boards according to claim 1, characterized in that, The detection platform also includes side plates (15) and support legs. The side plates (15) are respectively disposed on both sides of the roller bracket (6). Bearings are provided on the two side plates (15) corresponding to the two ends of the support roller (7). The side plates (15) are fixed to the roller bracket (6), and the support roller (7) is rotatably connected to the roller bracket (6) through the bearings. The legs are located at the corners of the bottom surface of the roller support (6).

3. The automated defect detection device for flexible circuit boards according to claim 1, characterized in that, The electric guide rail (11) is arranged longitudinally and fixed to the ground. The connecting plate (12) has a long strip structure and is an integral structure with the slider. A horizontal groove is opened on the connecting plate (12). The pressure plate (13) is provided with a mounting frame (16). The mounting frame (16) has a U-shaped structure. The pressure plate (13) is fixed in the middle of the mounting frame (16). The side of the mounting frame (16) is set in the horizontal groove. The mounting frame (16) and the connecting plate (12) are fixed by bolts.

4. The automated defect detection device for flexible circuit boards according to claim 3, characterized in that, The mounting base (10) is a square structure with a hollow interior. A circular through hole is provided in the middle of the mounting base (10), and an image acquisition mechanism (2) is provided inside the mounting base (10). The mounting base (10) is embedded in the top of the detection bracket (5), and the side of the mounting base (10) is fixed to the mounting base (10) by bolts; The position sensor includes a ranging sensor (17) and an infrared detection sensor (18), with the ranging sensor (17) being set in the mounting frame (16); The infrared detection sensor (18) is set close to the image acquisition mechanism (2). The ranging sensor (17) and the infrared detection sensor (18) are set inside the mounting base (10). The bottom of the mounting base (10) has detection holes corresponding to the ranging sensor (17) and the infrared detection sensor (18). The mounting direction of the ranging sensor (17) and the infrared detection sensor (18) is perpendicular to the mounting frame (16). The outputs of the ranging sensor (17) and the infrared detection sensor (18) are connected to the input of the controller (14).

5. The automated defect detection device for flexible circuit boards according to claim 1, characterized in that, The light source includes a ring light source (19) and two side light sources (20). The image acquisition mechanism (2) includes an area array camera and a telecentric lens. The ring light source (19) is fixed on the mounting base (10) and surrounds the telecentric lens. The two side light sources (20) are fixed to the two sides of the detection bracket (5) respectively, and the two side light sources (20) are at a 30° angle to the area array camera respectively; The side light source (20) and the ring light source (19) are electrically connected to the controller (14).

6. The automated defect detection device for flexible circuit boards according to claim 1, characterized in that, The controller (14) includes a PLC controller. The first conveyor (3) and the second conveyor (4) both include belt conveyors. The belt conveyors are equipped with motors. The drive motor (9), the motor and the electric guide rail (11) are all servo motors. The servo motors are equipped with frequency converters. The frequency converters are connected to the PLC controllers in communication. The servo motors are connected to the power supply through the frequency converters. The button module includes multiple buttons, each of which is connected to the input terminal of the PLC controller. The PLC controller has an HMI module for communication.

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