洗衣机装配缝隙与阶差测量系统设计

Design of Gap and Flush Measurement System for Washing Machine Assembly

提出一种基于线结构光的缝隙和阶差尺寸测量方法,通过搭建洗衣机表面质量视觉检测平台,采集洗衣机缝隙图像,设计了一种洗衣机缝隙检测算法,在阈值分割、缝隙定位后获取缝隙ROI图像,采用最小二乘法拟合缝隙边缘,利用线结构光传感器进行标定,根据标定结果计算缝隙尺寸;设计了一种洗衣机阶差检测算法,通过阶差位置获取光条图像,在阈值分割、中心线提取后,寻找阶差两侧的特征点,将二维坐标转换为三维坐标计算阶差。试验结果表明:系统缝隙检测误差0.124 mm,阶差检测误差0.170 mm,满足洗衣机缝隙与阶差测量的要求。

In this paper,a gap and flush measurement method based on line structured light is established by designing a visual inspection platform for washing machine surface quality.A gap measurement algorithm is designed.After threshold segmentation and gap positioning,on ROI image is obtained,and the least square method is used to fit the gap edge.The gap width is calculated according to the calibration results of line structured light sensor.A washing machine flush measurement algorithm is then designed.The light strip ROI image is obtained through the gap position.After threshold segmentation and centerline extraction,the feature points on both sides of the gap are found.The two-dimensional coordinates are transformed into threedimensional coordinates through the calibration results,then the flush depth is calculated.The experiment results show that the absolute error of gap width measurement is 0.124 mm and the absolute error of flush size measurement is 0.170 mm,which meets the requirements of automatic measurement for washing machines.