摘要
目的针对制袋机在生产圆角袋时,常采用的双切方法存在的效率低、废料多、机械磨损快等问题,基于机器视觉设计圆角袋单切系统。方法搭建视觉硬件平台,基于OpenCV视觉库,在Visual Studio开发环境中编写视觉软件。相机采用飞拍模式,通过第1牵引伺服编码器分频输出信号给PLC,PLC利用高速计数器通过I/O口对相机进行硬触发。用标定板对相机进行标定,得出像素当量值,经过滤波、二值化、边缘检测等处理后对圆角轮廓进行特征提取,制作模板。通过遍历图像,在模板圆角中心线上添加特征点,完成模板匹配时可直接得出当前图像圆角中心坐标,将圆角中心坐标与基准线坐标的差值作为纠偏值发给PLC,PLC控制移刀伺服实现单刀精准切除。结果该方法可实现在拉料过程中,对圆角中心进行快速、准确定位,在当前制袋周期对当前袋子进行移刀裁切,实际裁切误差在±0.1 mm以内,满足目前最小圆角半径0.125圆角袋的制作要求。结论采用飞拍模式的视觉系统图像处理速度快,可匹配高速制袋要求,有效解决传统生产圆角袋时出现的问题,满足工业生产的需求,实际应用价值较大。
The work aims to design a single-cut system based on machine vision for rounded bags to solve the problems of low efficiency, large amount of waste and fast mechanical wear of the double-cut method often used in production of rounded bags by bag making machines. A visual hardware platform was built. Based on the OpenCV visual library, visual software was written in the visual studio development environment. The camera was set in the flying shooting mode, and the output signal was divided to the PLC through the first traction servo encoder. The PLC conducted hard trigger on the camera through the I/O port by virtue of a high-speed counter. A calibration board was used to calibrate the camera to get the pixel equivalent value. After filtering, binarization, edge detection and other processing, the feature of the rounded corner was extracted to make the template. By traversing the image, key points were added on the center line of the template corners, the template center coordinates can be directly obtained when the template matching was completed. The difference between the center coordinates of the corners and the baseline coordinates was sent to the PLC which controlled the tool-shifting servo to realize single-cutter precise cutting. This method can realize fast and accurate positioning of fillet center in pulling the material, and the current bag-making cycle was used to move the knife to cut the current bag. The actual cutting error was within ±0.1 mm, which met the current production requirement on minimum fillet radius 0.125 round corner bag. The vision system adopting the flying mode has high image processing speed, can match the high-speed bag-making requirements, effectively solve the problems that occur in the traditional production of round-cornered bags, meet the needs of industrial production, and have great practical application value.
作者
咸浩
王景良
邵小江
朱龙彪
陈丰明
XIAN Hao;WANG Jing-liang;SHAO Xiao-jiang;ZHU Long-biao;CHEN Feng-ming(School of Mechanical Engineering,Nantong University,Nantong 226019,China;Jiangsu Maritime Institute,Nanjing 211199,China;Wuxi KING-MO Machinery Manufacturing Co.,Ltd.,Wuxi 214107,China)
出处
《包装工程》
CAS
北大核心
2021年第1期178-185,共8页
Packaging Engineering
基金
科技型中小企业技术创新基金(G20193002)。
关键词
圆角袋
机器视觉
飞拍
特征提取
裁切
rounded corner bag
machine vision
flying shooting
feature extraction
cropping
