采用线结构光的电动汽车电池包箱体孔组位置在线测量

三坐标测量机和位置度量规测量新能源汽车电池包箱体孔组效率低,投入大,且无法满足在线检测的要求。为此构建由大理石平台、直线电动机、3D线扫相机等组成的在线电池包箱体孔组位置度检测系统。该系统作为电池包生产线的一部分,在机械手将电池包放入检测平台后,直线电动机带动3D线扫相机获取电池包箱体孔组的3D点云数据。将3D点云投影到标定平面,采用中值滤波降噪预处理,膨胀、腐蚀逼出被检测孔轮廓,提取ROI;Canny边缘检测提取轮廓线,最小二乘法提取特征获取圆心坐标与装配孔半径,并采用柔性定位的方法校正所获得的数据。结果表明,在线电池包箱体孔组位置度检测系统满足电池包装配孔位置度0.2 mm的测量需求。

On-line measurement of position degree of battery packing holes for new energy vehicles using line structured light

The three coordinate measuring machine and position measuring gauge are inefficient,expensive and can not meet the requirements of on-line detection.For these reasons,an on-line measurement system for the hole group position of battery packages is constructed,which is composed of marble platform,linear motor,3D line-scan camera and so on.As a part of the battery pack production line,after the battery pack is put into the detection platform by the manipulator,the linear motor drives the 3D line scan camera to obtain the 3D point cloud data of the battery pack box hole group.The 3D point cloud is projected to the calibration plane,and the noise reduction pretreatment with median filter is used to extract ROI by dilating and corroding the outline of the detected hole.The outline is extracted by Canny edge detection,and the features are extracted by least square method to obtain the center coordinates and the radius of the assembly hole.The data obtained are corrected by flexible positioning method.The results show that the on-line positioning system of battery packages can meet the measurement requirement of 0.2mm positioning of battery packages.