PCB board thickness measuring device based on adaptive binocular vision

Abstract

The utility model relates to a kind of PCB board thickness measuring device based on adaptive binocular vision, including machine table, feed conveying track, feeding assembly, AVI inspection component, discharge assembly, binocular range finder and discharge conveying track, the side of machine table is connected feed conveying track, the other side is connected discharge conveying track, feed area, AVI detection area and discharge area are sequentially set on the machine table, feeding assembly is set in feed area, AVI inspection component is set in AVI detection area, discharge assembly is set in discharge area, feeding assembly is set close to feed conveying track, binocular range finder is set on discharge conveying track. The utility model integrates the detection of binocular range finder and AVI appearance inspection machine, for the thickness measurement and appearance defect synchronous detection of PCB board, realize thickness and appearance synchronous detection.

Description

Technical Field

[0001] This utility model relates to the field of electronic manufacturing inspection technology, and in particular to a PCB board thickness measurement device based on adaptive binocular vision, which is suitable for high-precision and high-efficiency automated production lines. Background Technology

[0002] Traditional PCB thickness measurement methods have the following technical drawbacks:

[0003] (1) Inefficient manual measurement: Using tools such as micrometers, relying on manual operation, the measurement speed is slow and the error is large;

[0004] (2) High environmental sensitivity: The laser triangulation method is affected by surface reflection, which increases the error in the thickness measurement of matte PCBs;

[0005] (3) Insufficient dynamic accuracy: Existing machine vision solutions have not solved the matching deviation caused by production line vibration.

[0006] The aforementioned shortcomings make it difficult for existing technologies to meet the high-precision requirements of high-end PCB manufacturing, and also result in low overall efficiency. Therefore, this invention proposes a PCB thickness measurement device based on adaptive binocular vision to overcome these problems. Utility Model Content

[0007] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a PCB board thickness measurement device based on adaptive binocular vision. It integrates a binocular ranging device with an AVI appearance inspection machine for integrated detection, and is used for simultaneous detection of PCB board thickness and appearance defects, thereby achieving simultaneous detection of thickness and appearance.

[0008] The purpose of this utility model is achieved as follows:

[0009] A PCB board thickness measurement device based on adaptive binocular vision includes a machine base, a feeding conveyor track, a feeding component, an AVI inspection component, an unloading component, a binocular ranging device, and an unloading conveyor track. One side of the machine base is connected to the feeding conveyor track, and the other side is connected to the unloading conveyor track. The machine base is sequentially arranged with a feeding area, an AVI inspection area, and an unloading area. The feeding area is equipped with a feeding component, the AVI inspection area is equipped with an AVI inspection component, and the unloading area is equipped with an unloading component. The feeding component is located close to the feeding conveyor track, and the binocular ranging device is installed on the unloading conveyor track.

[0010] The AVI inspection assembly includes an inspection bracket, an AVI camera, and a baffle. The AVI camera is mounted on the inspection bracket, and the baffle is located below the inspection bracket.

[0011] The binocular ranging device includes a binocular support frame, a first camera, a second camera, and a light source. The binocular support frame is a U-shaped frame, including two parallel binocular ranging support columns and a binocular ranging crossbeam set between the two binocular ranging support columns. The two binocular ranging support columns are respectively set on both sides of the discharge conveying track. A fine-tuning slide rail is provided in the middle of the binocular ranging crossbeam, and the first camera and the second camera are slidably mounted on the fine-tuning slide rail.

[0012] The binocular ranging beam is also equipped with two light source connecting rods on the left and right. The bottom of the two light source connecting rods is connected to the two ends of the light source, and the two light source connecting rods are respectively set at the two ends of the fine adjustment slide rail. The light source is set below the first camera and the second camera.

[0013] Furthermore, the feeding assembly includes a feeding bracket, a feeding platform, and a dust-adhesive roller. The feeding bracket is a U-shaped frame, including two sets of parallel feeding support columns and a feeding crossbeam disposed between the feeding support columns. The bottoms of the feeding support columns at both ends are fixed to the machine platform. The feeding platform is connected to the feeding crossbeam by a connector. The connector is slidably disposed on the feeding crossbeam and driven by a cylinder, which is fixed on the feeding crossbeam.

[0014] Furthermore, the feeding platform is also equipped with a feeding arm.

[0015] Furthermore, a set of dust-adhesive rollers is provided on the side of the feeding bracket away from the feeding conveyor track, and the dust-adhesive rollers are mounted on the machine platform.

[0016] Furthermore, the detection bracket is a U-shaped frame, including two sets of parallel detection support columns and a detection crossbeam set between the detection support columns. Each set of detection support columns includes two detection support columns arranged in parallel front and rear, and the bottom of the detection support columns is fixed to the machine platform.

[0017] Furthermore, a baffle is provided directly below the detection beam. The baffle is vertically installed on the machine platform and blocks the product at the detection position. An AVI camera is provided directly above the detection position. The AVI camera is connected to the center of the detection beam through a telescopic mechanism, and the position of the AVI camera can be adjusted according to the position of the product.

[0018] Furthermore, the discharge assembly includes a discharge bracket and a discharge platform. The discharge bracket is a U-shaped frame, including two sets of parallel discharge support columns and a discharge crossbeam disposed between the discharge support columns. The bottoms of the discharge support columns at both ends are fixed to the machine platform, and the discharge platform is connected to the discharge crossbeam by connectors.

[0019] Furthermore, the binocular bracket adopts a modular quick-install bracket, and the binocular ranging support column of the binocular bracket is locked to both sides of the discharge conveying track with buckles, and fixed with a magnetic base at the bottom.

[0020] Furthermore, the first and second cameras are externally wrapped with silicone damping rings to attenuate high-frequency vibrations on the production line.

[0021] Furthermore, the first and second cameras are locked to the binocular bracket via pneumatic pins, reducing replacement time.

[0022] Compared with the prior art, the beneficial effects of this utility model are:

[0023] This invention provides a PCB board thickness measurement device based on adaptive binocular vision, enabling automated inspection of product dimensions, reducing labor costs, and improving inspection efficiency. Furthermore, it boasts high precision and reliability, meeting the requirements for accurate product dimensions; simultaneously, its ease of operation and flexibility allow for the application of dimensional measurement to products of different types and shapes, providing accurate dimensional measurement results. It possesses the following advantages:

[0024] (1) Doubled detection efficiency: Thickness and appearance are detected simultaneously, greatly improving the detection speed;

[0025] (2) Zero positioning error: The common reference design ensures the consistency of measurement position and greatly reduces deviation;

[0026] (3) Space saving: Reduce independent workstations and shrink the area occupied by the production line;

[0027] (4) Improved anti-interference: The anti-vibration structure greatly reduces measurement fluctuations under vibration environment. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the frame structure of this utility model.

[0029] Figure 2 This is a schematic diagram of the frame structure from another angle of this utility model.

[0030] Figure 3 This is a front view of the present invention.

[0031] Figure 4 This is a side view of the present invention.

[0032] Figure 5 This is a top view of the present invention.

[0033] in:

[0034] 1. Machine base, 2. Feeding conveyor track, 3. Feeding bracket, 4. Dust-adhesive roller, 5. Detection bracket, 6. AVI camera, 7. Baffle, 8. Discharge bracket, 9. Discharge platform, 10. Binocular ranging device, 11. Binocular bracket, 11.1. First camera, 11.2. Second camera, 11.3. Light source, 11.4. Discharge conveyor track, 12. Detailed Implementation

[0035] To better understand the technical solution of this utility model, a detailed description will be provided below in conjunction with relevant illustrations. It should be understood that the specific embodiments described below are not intended to limit the specific implementation of the technical solution of this utility model, but are merely possible implementations of the technical solution of this utility model. It should be noted that the descriptions of the positional relationships of the components herein, such as component A being located above component B, are based on the relative positions of the components in the illustrations and are not intended to limit the actual positional relationships of the components. Example 1

[0036] See Figures 1-5 , Figure 1 A schematic diagram of the structure of this utility model is shown. As shown in the figure, a PCB board thickness measurement device based on adaptive binocular vision according to this utility model includes a machine base 1, a feeding conveyor track 2, a feeding component, an AVI inspection component, an output component, a binocular ranging device 11, and an output conveyor track 12. One side of the machine base 1 is connected to the feeding conveyor track 2, and the other side is connected to the output conveyor track 12. The machine base 1 is sequentially provided with a feeding area, an AVI inspection area, and an output area. The feeding area is provided with a feeding component, the AVI inspection area is provided with an AVI inspection component, and the output area is provided with an output component. The feeding component is located close to the feeding conveyor track 2, and the binocular ranging device 11 is provided on the output conveyor track 12.

[0037] The feeding assembly includes a feeding bracket 3, a feeding platform 4, and dust-adhesive rollers 5. The feeding bracket 3 is a U-shaped frame, including two sets of parallel feeding support columns and a feeding crossbeam disposed between the feeding support columns. The bottoms of the feeding support columns at both ends are fixed to the machine base 1. The feeding platform 4 is connected to the feeding crossbeam by a connector. The connector is slidably disposed on the feeding crossbeam and driven by a cylinder, which is fixed to the feeding crossbeam. The feeding platform 4 is also provided with a feeding arm. A set of dust-adhesive rollers 5 is provided on the side of the feeding bracket 3 away from the feeding conveyor track 2. The dust-adhesive rollers 5 are disposed on the machine base 1.

[0038] The AVI inspection assembly includes an inspection bracket 6, an AVI camera 7, and a baffle 8. The inspection bracket 6 is a gate-shaped frame, including two sets of parallel inspection support columns and an inspection crossbeam set between the inspection support columns. Each set of inspection support columns includes two inspection support columns arranged in parallel front and rear. The bottom of the inspection support columns is fixed on the machine base 1.

[0039] A baffle 8 is located directly below the detection beam. The baffle 8 is vertically mounted on the machine base 1 and blocks the product at the detection position. An AVI camera 7 is located directly above the detection position. The AVI camera 7 is connected to the center of the detection beam through a telescopic mechanism, and its position can be adjusted according to the product position.

[0040] The discharge assembly includes a discharge bracket 9 and a discharge platform 10. The discharge bracket 9 is a U-shaped frame, including two sets of parallel discharge support columns and a discharge crossbeam set between the discharge support columns. The bottom of the discharge support columns at both ends is fixed on the machine base 1, and the discharge platform 10 is connected to the discharge crossbeam by a connector.

[0041] The binocular ranging device 11 includes a binocular support 11.1, a first camera 11.2, a second camera 11.3, and a light source 11.4. The binocular support 11.1 is a U-shaped frame, including two parallel binocular ranging support columns and a binocular ranging crossbeam set between the two binocular ranging support columns. The two binocular ranging support columns are respectively set on both sides of the discharge conveying track 12. A fine-tuning slide rail is provided in the middle of the binocular ranging crossbeam. The first camera 11.2 and the second camera 11.3 are slidably mounted on the fine-tuning slide rail. The fine-tuning slide rail is used to adjust the distance between the binocular cameras (first camera 11.2 and second camera 11.3) to adapt to different PCB sizes.

[0042] The binocular ranging beam is also equipped with two light source connecting rods on the left and right. The bottom of the two light source connecting rods is connected to the two ends of the light source 11.4 respectively. The two light source connecting rods are respectively set at the two ends of the fine adjustment slide rail. The light source 11.4 is set below the first camera 11.2 and the second camera 11.3.

[0043] In this embodiment, the binocular bracket 11.1 adopts a modular quick-install bracket. The binocular ranging support column of the binocular bracket 11.1 is locked to both sides of the discharge conveying track 12 with buckles, and the bottom magnetic seat is fixed.

[0044] In this embodiment, the first camera 11.2 and the second camera 11.3 are wrapped with silicone damping rings to attenuate high-frequency vibrations on the production line; the first camera 11.2 and the second camera 11.3 are locked to the binocular bracket 11.1 by pneumatic pins to shorten the replacement time.

[0045] In this embodiment, the first camera 11.2 and the second camera 11.3 are connected to the MES system. The MES system is equipped with a camera calibration module, a stereo correction module, a stereo matching module and a disparity calculation module. The operation process is as follows: camera calibration - stereo correction (including distortion elimination) - stereo matching - disparity calculation - depth calculation (3D coordinates) calculation.

[0046] Camera calibration module:

[0047] Internal parameter calibration: The focal length f and distortion coefficient are obtained using the Zhang Zhengyou calibration method.

[0048] External parameter calibration: The relative positions of the two cameras (rotation matrix R and translation vector T) are calculated using a checkerboard or 3D calibration target.

[0049] 3D correction module:

[0050] Using OpenCV's built-in library functions for stereo calibration, the process begins by inputting the intrinsic parameters, distortion coefficients, and rotation / translation matrices between the two cameras. The cv2.stereoRectify() function is then used to calculate the calibration transformation parameters for the left and right cameras. Finally, the cv2.initUndistortRectifyMap() and cv2.remap functions are called to calibrate the images captured by the left and right cameras.

[0051] 3D matching module:

[0052] Stereo matching is the process of finding corresponding points of the same object in two images by comparing the pixel values ​​or features of corresponding points in the left and right images. In binocular vision, due to the difference in the viewing angles of the two cameras, the pixel positions of the same object in the left and right images will be offset, and stereo matching is needed to find the corresponding pixel points.

[0053] Parallax calculation module:

[0054] A fast detection method based on the SGBM algorithm is introduced. SGBM is a semi-global cost aggregation matching algorithm that considers not only local region matching but also the consistency of overall image blocks. Based on this, the disparity calculation module in this embodiment uses information from both the left and right images to detect each pixel and, using this information from both images, finds the optimal matching point. Compared to the BM method, the disparity calculation module in this embodiment is more robust to problems such as missing textures and uneven surface shapes, but it requires more computation.

[0055] The binocular ranging device of this invention can calculate the distance from the camera to the object being measured using a depth map, and then calculate the difference between the distance from the camera to the platform to determine the thickness of the object being measured.

[0056] Working principle:

[0057] This invention provides a PCB board thickness measurement device based on adaptive binocular vision.

[0058] Installation process:

[0059] Insert the quick-release bracket of the binocular rangefinder into the side rail of the AVI rack, and the magnetic base will automatically attach and fix it in place.

[0060] Adjust the slide rail to match the binocular camera spacing to the PCB width;

[0061] Pneumatic latches lock the binocular camera.

[0062] Testing process:

[0063] The PCB is precisely fixed by positioning pins;

[0064] An AVI camera scans for surface defects, while a binocular module simultaneously measures the thickness.

[0065] Data is uploaded to the MES system in real time for correlation analysis.

[0066] This invention achieves seamless integration into the production line: the modular bracket enables the binocular system to be "plug and play," achieving zero-error correlation detection of thickness and appearance data. This invention supports high-speed operation of 800 pieces / hour, achieving an accuracy of ±1μm under vibration conditions, significantly improving the inspection efficiency of PCB production lines.

[0067] The above are merely specific application examples of this utility model and do not constitute any limitation on the scope of protection of this utility model. All technical solutions formed by equivalent transformations or equivalent substitutions fall within the scope of protection of this utility model.

Claims

1. A PCB board thickness measurement device based on adaptive binocular vision, characterized in that: The machine includes a machine base (1), a feeding conveyor track (2), a feeding component, an AVI inspection component, a discharging component, a binocular distance measuring device (11), and a discharging conveyor track (12). One side of the machine base (1) is connected to the feeding conveyor track (2), and the other side is connected to the discharging conveyor track (12). The machine base (1) is provided with a feeding area, an AVI inspection area, and a discharging area in sequence. The feeding area is provided with a feeding component, the AVI inspection area is provided with an AVI inspection component, and the discharging area is provided with a discharging component. The feeding component is located close to the feeding conveyor track (2), and the discharging conveyor track (12) is provided with a binocular distance measuring device (11). The AVI inspection assembly includes an inspection bracket (6), an AVI camera (7), and a baffle (8). The inspection bracket (6) is equipped with the AVI camera (7), and the inspection bracket (6) is equipped with the baffle (8) below it. The binocular ranging device (11) includes a binocular support (11.1), a first camera (11.2), a second camera (11.3), and a light source (11.4). The binocular support (11.1) is a U-shaped frame, including two parallel binocular ranging support columns and a binocular ranging crossbeam set between the two binocular ranging support columns. The two binocular ranging support columns are respectively set on both sides of the discharge conveying track (12). A fine-tuning slide rail is provided in the middle of the binocular ranging crossbeam, and the first camera (11.2) and the second camera (11.3) are slidably mounted on the fine-tuning slide rail. The binocular ranging beam is also equipped with two light source connecting rods on the left and right. The bottom of the two light source connecting rods is connected to the two ends of the light source (11.4) respectively. The two light source connecting rods are respectively set at the two ends of the fine adjustment slide rail. The light source (11.4) is set below the first camera (11.2) and the second camera (11.3).

2. The PCB board thickness measurement device based on adaptive binocular vision according to claim 1, characterized in that: The feeding assembly includes a feeding bracket (3), a feeding platform (4), and a dust-adhesive roller (5). The feeding bracket (3) is a U-shaped frame, including two sets of parallel feeding support columns and a feeding crossbeam set between the feeding support columns. The bottom of the feeding support columns at both ends is fixed on the machine base (1). The feeding platform (4) is connected to the feeding crossbeam by a connector. The connector is slidably set on the feeding crossbeam and driven by a cylinder. The cylinder is fixed on the feeding crossbeam.

3. The PCB board thickness measurement device based on adaptive binocular vision according to claim 2, characterized in that: The feeding platform (4) is also equipped with a feeding arm.

4. The PCB board thickness measurement device based on adaptive binocular vision according to claim 2, characterized in that: The feeding bracket (3) is provided with a set of dust-adhesive rollers (5) on the side away from the feeding conveyor track (2), and the dust-adhesive rollers (5) are set on the machine base (1).

5. The PCB board thickness measurement device based on adaptive binocular vision according to claim 1, characterized in that: The detection bracket (6) is a gate-shaped frame, including two sets of parallel detection support columns and a detection crossbeam set between the detection support columns. Each set of detection support columns includes two detection support columns arranged in parallel front and rear. The bottom of the detection support columns is fixed on the machine base (1).

6. The PCB board thickness measurement device based on adaptive binocular vision according to claim 5, characterized in that: A baffle (8) is provided directly below the detection beam. The baffle (8) is vertically set on the machine base (1). The baffle (8) blocks the product at the detection position. An AVI camera (7) is provided directly above the detection position. The AVI camera (7) is connected to the center of the detection beam. The position of the AVI camera (7) can be adjusted according to the product position.

7. The PCB board thickness measurement device based on adaptive binocular vision according to claim 1, characterized in that: The discharge assembly includes a discharge bracket (9) and a discharge platform (10). The discharge bracket (9) is a U-shaped frame, including two sets of parallel discharge support columns and a discharge crossbeam set between the discharge support columns. The bottom of the discharge support columns at both ends is fixed on the machine base (1), and the discharge platform (10) is connected to the discharge crossbeam by a connector.

8. The PCB board thickness measurement device based on adaptive binocular vision according to claim 1, characterized in that: The binocular bracket (11.1) adopts a modular quick-install bracket. The binocular ranging support column of the binocular bracket (11.1) is locked to both sides of the discharge conveying track (12) with a snap fastener and fixed with a magnetic suction seat at the bottom.

9. The PCB board thickness measurement device based on adaptive binocular vision according to claim 1, characterized in that: The first camera (11.2) and the second camera (11.3) are wrapped with silicone damping rings to attenuate high-frequency vibrations on the production line.

10. The PCB board thickness measurement device based on adaptive binocular vision according to claim 1, characterized in that: The first camera (11.2) and the second camera (11.3) are locked to the binocular bracket (11.1) by a pneumatic pin, which shortens the replacement time.

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