三偏心蝶阀密封面在位测量的点云数据处理方法  

A point cloud data processing method for in-position measurement of sealing surface of triple eccentric butterfly valves

作　　者：彭娉 陈时健 任利杰 于新海[1] 陈尚书 李锦[1] Peng Ping;Chen Shijian;Ren Lijie;Yu Xinhai;Chen Shangshu;Li Jin(School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China;SUFA Technology Industry Co.,Ltd.CNNC,Jiangsu 215011,China)

机构地区：[1]华东理工大学机械与动力工程学院,上海200237 [2]中核苏阀科技实业股份有限公司,江苏215011

出　　处：《仪器仪表学报》2021年第12期30-38,共9页Chinese Journal of Scientific Instrument

基　　金：上海市自然科学基金(19ZR1413300)项目资助。

摘　　要：三偏心蝶阀依靠蝶板和阀座密封面的充分面接触实现零泄漏的密封效果,而密封面的加工制造精度对密封性能有着至关重要的作用。现有的密封面测量主要依赖离线测量的方式,存在着测量基准不统一、二次装夹造成的测量误差等问题。本文提出了密封面精密在位测量技术以及原始点云数据处理方法。针对被测密封面,提出波谷-聚类算法和考虑约束条件的法矢-曲面拟合算法,得出密封面的关键参数和加工误差。该算法较最小二乘法等算法在相对求解精度上提高了60%以上。现场在位测量的三偏心蝶阀密封面锥角与三坐标仪测量结果的相对误差仅为0.43%,满足测量相对误差±0.5%的要求,密封面在位测量技术的测量精度得到了有效验证,为今后高端阀门的精密测量提供了可靠的技术手段。The tri-eccentric butterfly valve relies on full surface contact between the butterfly plate and the valve seat sealing surface to achieve zero leakage sealing effect.The sealing surface of the processing and manufacturing accuracy has a vital influence on the sealing performance.The existing sealing surface measurement mainly relies on the off-line measurement,and there are some problems such as inconsistent measurement datum and measurement errors caused by secondary clamping.In this study,the precision in-position measurement technique of sealing surface and the original point cloud data processing method is proposed.For the measured sealing surface,the trough-clustering algorithm and the normal vector-surface fitting algorithm considering constraints are proposed.The key parameters and machining error of the sealing surface are obtained.Compared with the least square method,the relative accuracy of this algorithm is improved by more than 60%.The relative error between the cone angle of the sealing surface of the three-eccentric butterfly valve measured in situ and the result measured by the CMM is only 0.43%,which meets the requirement of±0.5%.The measurement accuracy of the in-position measurement technology of the sealing surface has been verified effectively,which provides a reliable technical means for the precision measurement of high-end valves in the future.

关 键 词：在位测量 点云处理 曲面拟合 法矢 

分 类 号：TH164[机械工程—机械制造及自动化]