Detection device and method with marking function for detecting defects of circuit layer on printed circuit board

Abstract

The invention discloses a detection device and method with a marking function for detecting defects of a circuit layer on a printed circuit board, and relates to the technical field of visual detection of surface defects of the circuit layer on the printed circuit board, the detection device comprises a platform, a push cylinder and a support, the push cylinder and the support are fixedly arranged on the top surface of the platform; a positioning seat is fixedly arranged at the acting end of a piston rod of the pushing air cylinder, a positioning spigot penetrating through the right end face of the positioning seat is formed in the top surface of the positioning seat, an output shaft of the servo motor downwards penetrates through the top wall of the support, and a rotating plate is fixedly arranged at the extending end of the output shaft. An L-shaped plate is fixedly arranged at the left end of the rotating plate, a vertically-arranged CCD lens is fixedly arranged in the horizontal part of the L-shaped plate, a vertical air cylinder is fixedly arranged on the top surface of the right end of the rotating plate, a rotating shaft of the rotating air cylinder downwards penetrates through the lifting plate and extends to be fixedly provided with an eccentric plate, and a vertically-arranged Mark pen is fixedly arranged in the eccentric plate. The device has the beneficial effects that a circle can be drawn at a defect position automatically, and the workload of workers is greatly reduced.

Description

Technical Field

[0001] This invention relates to the technical field of visual detection of surface defects in the circuit layer of a printed circuit board, and in particular to a detection device and method for detecting defects in the circuit layer of a printed circuit board with marking function. Background Technology

[0002] The structure of printed circuit board 1 produced in a certain workshop is as follows: Figures 1-2 As shown, a circuit layer 2 is formed on the top surface of the printed circuit board 1 along its length. The circuit layer 2 is formed on the top surface of the printed circuit board (1) by a thermoforming process. Due to the thermoforming process, some of the circuit layer 2 on the top surface of the printed circuit board 1 has defects, including pits, cracks, etc.

[0003] Therefore, a vision inspection machine is used in the workshop to perform surface inspection on the circuit layer 2 of each printed circuit board 1, in order to facilitate subsequent defect repair. The specific inspection method is as follows: S1, the worker takes out a... Figures 1-2 The printed circuit board 1 to be tested is shown. The printed circuit board 1 is placed flat on the test table of the testing machine. S2. The worker pushes the printed circuit board (1) by hand so that the right end of the circuit layer 2 on the printed circuit board 1 moves directly below the CCD lens of the vision inspection machine. At this time, the CCD lens detects whether there is a defect on the top surface of the right end of the circuit layer 2. If the CCD lens identifies that there is a defect, the worker uses a marker to draw a circle on the top surface of the right end of the circuit layer (2) to circle the defect, so that the worker can quickly find the location of the defect and repair it. S3. The worker repeats step S2 multiple times so that the circuit layer (2) on the printed circuit board (1) gradually passes through the CCD lens. When the circuit layer (2) has completely passed through the CCD lens, the defect detection of the circuit layer (2) of a printed circuit board (1) can be completed, and a circle is marked at the location of the defect. S4. Workers can complete the inspection of the circuit layer (2) of a batch of printed circuit boards (1) by repeating the operation of steps S1 to S3.

[0004] However, although the vision inspection machine used in the workshop can detect defects on the circuit layer (2) of the printed circuit board (1), the following technical problems still emerge in actual operation: In step S2, when the CCD lens detects a defect on the circuit layer (2), the worker needs to manually draw a circle on the top surface of the circuit layer (2) with a marker pen to enclose the defect. When there are many defects on a circuit layer (2), the worker needs to draw circles manually, which undoubtedly increases the workload of the worker.

[0005] In addition, workers need to manually push the printed circuit board (1) so that the circuit layer (2) on the printed circuit board (1) moves directly below the CCD lens, which undoubtedly further increases the workload of the workers.

[0006] Therefore, there is an urgent need for a detection device and method that can automatically draw circles at defects, greatly reducing the workload of workers. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a detection device and method for detecting defects in the circuit layer of a printed circuit board with marking function.

[0008] The objective of this invention is achieved through the following technical solution: a detection device for detecting defects in the circuit layer of a printed circuit board with marking function, comprising a platform, a push cylinder and a bracket fixed on the top surface of the platform, a positioning seat fixed on the working end of the piston rod of the push cylinder, a positioning stop opening penetrating its right end face on the top surface of the positioning seat, a servo motor fixed on the top wall of the bracket, the output axis of the servo motor penetrating downward through the top wall of the bracket, and a rotating plate fixed on the extension end; An L-plate is fixed to the left end of the rotating plate. A vertically arranged CCD lens is fixed inside the horizontal part of the L-plate. A vertical cylinder is fixed to the top surface of the right end of the rotating plate. The piston rod of the vertical cylinder passes through the rotating plate downwards, and a lifting plate is fixed to the extended end. The lifting plate extends to the left, and a rotary cylinder is fixed to the top surface of the extended end. The rotation axis of the rotary cylinder passes through the lifting plate downwards, and an eccentric plate is fixed to the extended end. A vertically arranged Mark pen is fixed inside the eccentric plate, with the tip of the Mark pen facing downwards.

[0009] Foot pads are fixed on the bottom surface of the platform and at its four corners.

[0010] The positioning stop inside the positioning seat matches the outer contour of the printed circuit board, and the depth of the positioning stop is less than the thickness of the printed circuit board.

[0011] A connecting plate is fixed on the bottom surface of the right end of the positioning seat, and the connecting plate is fixed on the working end of the piston rod of the push cylinder.

[0012] The eccentric plate has a through hole that extends through its top and bottom surfaces, and the outer wall of the Mark pen is interference-fitted with the through hole.

[0013] The detection device also includes a controller, which is electrically connected to the push cylinder, vertical cylinder, servo motor and rotary cylinder via signal lines.

[0014] A method for detecting defects in the circuit layer of a printed circuit board with marking function, comprising the following steps: S1. The worker takes out a printed circuit board; S2. Place the printed circuit board into the positioning stop of the positioning seat from right to left. Since the positioning stop inside the positioning seat matches the outer contour of the printed circuit board, the printed circuit board is positioned. S3. Control the piston rod of the push cylinder to move to the right. The piston rod drives the connecting plate to move to the right. The connecting plate drives the positioning seat to move to the right. The positioning seat drives the printed circuit board inside to move to the right synchronously. When the piston rod of the push cylinder extends a certain distance, the controller controls the push cylinder to close. At this time, the right end of the circuit layer on the printed circuit board is just below the CCD lens. The CCD lens detects whether there are any defects on the top surface of the right end of the circuit layer. If the CCD lens detects a defect, it sends a signal to the controller. The controller first starts the servo motor, which drives the rotating plate to rotate. The rotating plate drives the CCD lens, vertical cylinder, rotary cylinder and Mark pen to rotate synchronously. When the Mark pen rotates 180 degrees, the controller controls the servo motor to shut down. At this time, the Mark pen is exactly above the circuit layer. Then, the controller controls the piston rod of the vertical cylinder to extend downwards. The piston rod drives the lifting plate to move downwards, and the lifting plate drives the rotary cylinder and the marker pen to move downwards synchronously. When the piston rod of the vertical cylinder is fully extended, the tip of the marker pen just contacts the top surface of the circuit layer. Then, the controller controls the rotating shaft of the rotary cylinder to rotate, and the rotating shaft drives the eccentric plate to rotate. The eccentric plate drives the marker pen to rotate synchronously, thus ultimately drawing a circle on the top surface of the circuit layer to circle the detected defect, making it easier for workers to quickly find the location of the defect. If the CCD lens does not detect a defect, the controller will not start the servo motor. S4. The worker repeats step S3 multiple times to allow the circuit layers on the printed circuit board to gradually pass through the CCD lens. Once the circuit layers have completely passed through the CCD lens, the defect detection of the circuit layers of a printed circuit board can be completed, and a circle is marked at the location of the defect. S5. Workers can complete the inspection of the circuit layers of a batch of printed circuit boards by repeating steps S1 to S4.

[0015] The present invention has the following advantages: it can automatically draw circles at defects and greatly reduce the workload of workers. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the printed circuit board structure. Figure 2 for Figure 1 AA section view; Figure 3 This is a schematic diagram of the structure of the present invention; Figure 4 A connection diagram of the push cylinder, connecting plate, and positioning seat; Figure 5 for Figure 4 Top view; Figure 6 A connection diagram of the servo motor, vertical cylinder, rotary cylinder, and marker pen; Figure 7 This is a schematic diagram of the eccentric plate structure; Figure 8 for Figure 7 Top view; Figure 9 A schematic diagram illustrating the positioning of a printed circuit board; Figure 10 This is a schematic diagram showing the right end of the circuit layer on a printed circuit board positioned directly below the CCD lens. Figure 11 This is a diagram showing the Mark pen positioned directly above the circuit layer. Figure 12 This is a schematic diagram showing the tip of the Mark pen just touching the top surface of the circuit layer; In the picture: 1-Printed circuit board, 2-Circuit layer; 3-Platform, 4-Push cylinder, 5-Bracket, 6-Positioning seat, 7-Positioning stop, 8-Servo motor, 9-Rotating plate, 10-L-plate, 11-CCD lens, 12-Vertical cylinder, 13-Lifting plate, 14-Rotating cylinder, 15-Eccentric plate, 16-Marker pen, 17-Foot pad, 18-Connecting plate, 19-Through hole. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings. The scope of protection of the present invention is not limited to the following description: like Figures 3-8As shown, a detection device for detecting defects in the circuit layer of a printed circuit board with marking function includes a platform 3, a push cylinder 4 fixed to the top surface of the platform 3, and a bracket 5. A positioning seat 6 is fixed to the working end of the piston rod of the push cylinder 4. A positioning stop 7 penetrating the right end face of the top surface of the positioning seat 6 is opened. A servo motor 8 is fixed to the top wall of the bracket 5. The output axis of the servo motor 8 penetrates downward through the top wall of the bracket 5, and a rotating plate 9 is fixed to its extended end. Foot pads 17 are fixed to the bottom surface of the platform 3 at its four corners. The positioning stop 7 in the positioning seat 6 matches the outer contour of the printed circuit board 1, and the depth of the positioning stop 7 is less than the thickness of the printed circuit board 1. A connecting plate 18 is fixed to the bottom surface of the right end of the positioning seat 6, and the connecting plate 18 is fixed to the working end of the piston rod of the push cylinder 4.

[0018] An L-plate 10 is fixed to the left end of the rotating plate 9. A vertically arranged CCD lens 11 is fixed inside the horizontal part of the L-plate 10. A vertical cylinder 12 is fixed to the top surface of the right end of the rotating plate 9. The piston rod of the vertical cylinder 12 passes downward through the rotating plate 9, and a lifting plate 13 is fixed to its extension end. The lifting plate 13 extends to the left, and a rotary cylinder 14 is fixed to the top surface of its extension end. The rotation axis of the rotary cylinder 14 passes downward through the lifting plate 13, and an eccentric plate 15 is fixed to its extension. A vertically arranged Mark pen 16 is fixed inside the eccentric plate 15, with the tip of the Mark pen 16 facing downward. A through hole 19 is opened inside the eccentric plate 15, penetrating its top and bottom surfaces. The outer wall of the Mark pen 16 is interference-fitted with the through hole 19.

[0019] The testing device also includes a controller, which is electrically connected to the push cylinder 4, vertical cylinder 12, servo motor 8 and rotary cylinder 14 via signal lines. The operator can control the piston rod of the push cylinder 4 and the piston rod of the vertical cylinder 12 to extend or retract through the controller. At the same time, the operator can also control the output shaft of the servo motor 8 and the rotation shaft of the rotary cylinder 14 to rotate in the forward or reverse direction, thereby facilitating the operator's operation.

[0020] A method for detecting defects in the circuit layer of a printed circuit board with marking function, comprising the following steps: S1, the worker takes out a... Figures 1-2 Printed circuit board 1 shown; S2. Place the printed circuit board 1 into the positioning stop 7 of the positioning seat 6 from right to left. Since the positioning stop 7 in the positioning seat 6 matches the outer contour of the printed circuit board 1, positioning of the printed circuit board 1 is achieved. Figure 9 As shown; S3. Control the piston rod of the push cylinder 4 to move to the right. The piston rod drives the connecting plate 18 to move to the right. The connecting plate 18 drives the positioning seat 6 to move to the right. The positioning seat 6 drives the printed circuit board 1 inside it to move to the right synchronously. When the piston rod of the push cylinder 4 extends a certain distance, the controller controls the push cylinder 4 to close. At this time, the right end of the circuit layer 2 on the printed circuit board 1 is just below the CCD lens 11. Figure 10 As shown, the CCD lens detects whether there are defects on the top surface of the right end of the circuit layer 2. If the CCD lens 11 detects a defect, it sends a signal to the controller. The controller first starts the servo motor 8, which drives the rotating plate 9 to rotate. The rotating plate 9 then drives the CCD lens 11, vertical cylinder 12, rotary cylinder 14, and Mark pen 16 to rotate synchronously. When the Mark pen 16 has rotated 180 degrees, the controller stops the servo motor 8. At this point, the Mark pen 16 is directly above the circuit layer 2. Figure 11 As shown; Then, the controller controls the piston rod of the vertical cylinder 12 to extend downwards. The piston rod drives the lifting plate 13 to move downwards, and the lifting plate 13 drives the rotary cylinder 14 and the Mark pen 16 to move downwards synchronously. When the piston rod of the vertical cylinder 12 is fully extended, the tip of the Mark pen 16 just contacts the top surface of the circuit layer 2. Figure 12 As shown; then the controller controls the rotating shaft of the rotary cylinder 14 to rotate, the rotating shaft drives the eccentric plate 15 to rotate, and the eccentric plate 15 drives the Mark pen 16 to rotate synchronously, thus finally realizing the drawing of a circle on the top surface of the circuit layer 2 to circle the detected defect, making it easier for workers to quickly find the location of the defect. If the CCD lens 11 does not detect a defect, the controller will not start the servo motor 8. S4. The worker repeats step S3 multiple times to allow the circuit layer 2 on the printed circuit board 1 to gradually pass through the CCD lens. Once the circuit layer 2 has completely passed through the CCD lens, the defect detection of the circuit layer 2 of a printed circuit board 1 can be completed, and a circle is marked at the location of the defect. S5. Workers can complete the inspection of the circuit layer 2 of a batch of printed circuit boards 1 by repeating steps S1 to S4.

[0021] As can be seen from step S3, this detection device only requires the coordinated operation of the servo motor 8, the vertical cylinder 12, and the rotary cylinder 14 to automatically draw a circle on the top surface of the circuit layer 2 with the Mark pen 16 to enclose the detected defect. Therefore, compared to the detection methods used in the workshop, this device eliminates the need to manually draw a circle on the top surface of the circuit layer 2 with the Mark pen each time to enclose the defect, thus greatly reducing the workload of workers.

[0022] Furthermore, this inspection device intermittently extends the piston rod of the push cylinder 4, thereby intermittently pushing the circuit layer 2 on the printed circuit board 1 directly below the CCD lens 11 to detect defects. Therefore, it eliminates the need for workers to manually and intermittently push the printed circuit board 1 to move the circuit layer 2 below the CCD lens 11, further reducing the workload of workers.

Claims

1. A detection device with marking function for detecting defects in the circuit layer of a printed circuit board, characterized in that: It includes a platform (3), a push cylinder (4) fixed on the top surface of the platform (3) and a bracket (5). A positioning seat (6) is fixed on the working end of the piston rod of the push cylinder (4). A positioning stop (7) penetrating through its right end face is opened on the top surface of the positioning seat (6). A servo motor (8) is fixed on the top wall of the bracket (5). The output axis of the servo motor (8) penetrates downward through the top wall of the bracket (5), and a rotating plate (9) is fixed on the extended end. The left end of the rotating plate (9) is fixed with an L plate (10), and a vertically arranged CCD lens (11) is fixed in the horizontal part of the L plate (10). A vertical cylinder (12) is fixed on the top surface of the right end of the rotating plate (9). The piston rod of the vertical cylinder (12) passes through the rotating plate (9) downward, and a lifting plate (13) is fixed on the extension end. The lifting plate (13) extends to the left, and a rotating cylinder (14) is fixed on the top surface of the extension end. The rotation axis of the rotating cylinder (14) passes through the lifting plate (13) downward, and an eccentric plate (15) is fixed on the extension. A vertically arranged Mark pen (16) is fixed in the eccentric plate (15), and the tip of the Mark pen (16) is facing downward.

2. The detection device for detecting defects in the circuit layer of a printed circuit board with marking function according to claim 1, characterized in that: Foot pads (17) are fixed on the bottom surface of the platform (3) and at its four corners.

3. The detection device for detecting defects in the circuit layer of a printed circuit board with marking function according to claim 2, characterized in that: The positioning stop (7) inside the positioning seat (6) matches the outer contour of the printed circuit board (1), and the depth of the positioning stop (7) is less than the thickness of the printed circuit board (1).

4. The detection device for detecting defects in the circuit layer of a printed circuit board with marking function according to claim 3, characterized in that: A connecting plate (18) is fixed on the bottom surface of the right end of the positioning seat (6), and the connecting plate (18) is fixed on the working end of the piston rod of the push cylinder (4).

5. The detection device for detecting defects in the circuit layer of a printed circuit board with marking function according to claim 4, characterized in that: The eccentric plate (15) has a through hole (19) that penetrates its top and bottom surfaces, and the outer wall of the Mark pen (16) is press-fitted with the through hole (19).

6. The detection device for detecting defects in the circuit layer of a printed circuit board with marking function according to claim 5, characterized in that: The detection device also includes a controller, which is electrically connected to the push cylinder (4), the vertical cylinder (12), the servo motor (8) and the rotary cylinder (14) via signal lines.

7. A method for detecting defects in the circuit layer of a printed circuit board with marking function, employing the detection device for detecting defects in the circuit layer of a printed circuit board with marking function as described in claim 6, characterized in that: It includes the following steps: S1. The worker takes out a printed circuit board (1). S2. Place the printed circuit board (1) into the positioning stop (7) of the positioning seat (6) from right to left. Since the positioning stop (7) in the positioning seat (6) matches the outer contour of the printed circuit board (1), the printed circuit board (1) is positioned. S3. Control the piston rod of the push cylinder (4) to move to the right. The piston rod drives the connecting plate (18) to move to the right. The connecting plate (18) drives the positioning seat (6) to move to the right. The positioning seat (6) drives the printed circuit board (1) inside it to move to the right in sync. When the piston rod of the push cylinder (4) extends a certain distance, the controller controls the push cylinder (4) to close. At this time, the right end of the circuit layer (2) on the printed circuit board (1) is just below the CCD lens (11). The CCD lens detects whether there are defects on the top surface of the right end of the circuit layer (2). If the CCD lens (11) detects a defect, the CCD lens (11) sends a signal to the controller. The controller first controls the servo motor (8) to start. The servo motor (8) drives the rotating plate (9) to rotate. The rotating plate (9) drives the CCD lens (11), vertical cylinder (12), rotary cylinder (14) and Mark pen (16) to rotate synchronously. When the Mark pen (16) rotates 180 degrees, the controller controls the servo motor (8) to turn off. At this time, the Mark pen (16) is just above the circuit layer (2). Then the controller controls the piston rod of the vertical cylinder (12) to extend downwards, the piston rod drives the lifting plate (13) to move downwards, the lifting plate (13) drives the rotary cylinder (14) and the Mark pen (16) to move downwards synchronously. When the piston rod of the vertical cylinder (12) is fully extended, the tip of the Mark pen (16) just contacts the top surface of the circuit layer (2). Then the controller controls the rotating shaft of the rotary cylinder (14) to rotate, the rotating shaft drives the eccentric plate (15) to rotate, the eccentric plate (15) drives the Mark pen (16) to rotate synchronously, thus finally realizing the drawing of a circle on the top surface of the circuit layer (2) to circle the detected defects, so that workers can quickly find the location of the defects. If the CCD lens (11) does not detect a defect, the controller will not start the servo motor (8); S4. The worker repeats step S3 multiple times so that the circuit layer (2) on the printed circuit board (1) gradually passes through the CCD lens. When the circuit layer (2) has completely passed through the CCD lens, the defect detection of the circuit layer (2) of a printed circuit board (1) can be completed, and a circle is marked at the location of the defect. S5. Workers can complete the inspection of the circuit layer (2) of a batch of printed circuit boards (1) by repeating steps S1 to S4.

Images