摘要
板式换热器作为新能源汽车制冷系统的重要组成部件,其安装位置精度直接影响整机的装配质量,进而关系到整车制冷系统的稳定性。由于板式换热器生产量大、检测指标多,现有的人工检测方式存在效率低下、无法定量追溯、容易错漏等缺点。因此,提出了一种基于机器视觉的板式换热器孔组形位在线检测方法,以实现板式换热器孔组形位检测的自动化与智能化。通过建立孔位置坐标变换模型,使用单部工业相机经不同位置的多次拍摄获取安装孔与接头孔的二维图像,通过相机标定、图像预处理、特征提取等手段,实时测取换热器孔组之间的位置关系,实现孔组位置度的在线检测。实验选用六组样品分别采用三坐标影像仪以及线激光测量产品位置度并与本文方法测得位置度结果进行对比,同时对测量系统进行不确定度分析,结果表明:所提检测方法的测量误差小于0.025 mm,具有较高的检测精度,能够满足生产线自动化检测需求。
As an important component of the refrigeration system of new energy vehicles,the accuracy of the installation position of the plate heat exchanger direct affects the assembly quality of the whole machine,and then is related to the stability of the vehicle refrigeration system.Due to the large production volume of plate heat exchangers and many detection indicators,the existing manual detection methods have the disadvantages of low efficiency,inability to quantitatively trace,and being easy to make mistakes.Therefore,an online detection method of plate heat exchanger hole formation based on machine vision is proposed to realize the automation and intelligence of plate heat exchanger hole group position detection.By establishing the hole position coordinate transformation model,a single industrial camera is used to obtain twodimensional images of the mounting hole and the joint hole through multiple shooting in different positions,and the position relationship between the heat exchanger hole group is measured in real time through camera calibration,image preprocessing,feature extraction and other means to realize the online detection of the position degree of the hole group.In the experiment,six groups of samples are selected to measure the position of the product by using threecoordinate imager and line laser,and the position degree got is compared with that got by using the proposed method,using uncertainty analysis of the measurement system was carried out,and the results showed that the measurement error of the detection method is less than 0.025 mm,which has high detection accuracy and can meet the needs of automatic detection of the production line.
作者
孙佳乐
曹松晓
徐志鹏
SUN Jiale;CAO Songxiao;XU Zhipeng(College of Metrology and Measurement Engineering,China Jiliang University,Hangzhou Zhejiang 310018,China)
出处
《传感技术学报》
北大核心
2025年第3期496-503,共8页
Chinese Journal of Sensors and Actuators
基金
浙江省自然科学基金项目(LY18E050009)。
关键词
形位测量
坐标变换
图像处理
板式换热器
机器视觉
position measurement
coordinate transformation
image processing
plate heat exchanger
machine vision
