针对井下爆炸装置主体密封螺纹的大径、中径、小径、螺距等参数的测量问题, 为了提高螺纹测量自动化程度, 在主体结构特点基础上研究了其外螺纹机器视觉测量方法。为了提高测量精度, 设计了基于双远心光学系统的外螺纹机器视觉测量系统。研究了螺纹图像区域提取方法、快速特征点提取方法、参数计算方法等。在所搭建平台上, 对所提出方法进行实验分析。实验结果表明, 被测螺纹导程为3 980.8 μm, 大径为65 435.6 μm, 螺纹小径为60 669.4 μm, 测量牙型高为2 383.1 μm, 满足4级螺纹精度要求, 证明了该方法的正确性和可行性。

External screw parameters such as top diameter, effective diameter, bottom diameter and lead of the down-hole explosive device body are needed to measure during producing. In order to improve the measurement automation, the external screw machine vision measuring method was studied on the basis of the device body structural features. A double-telecetric optical measuring system was designed for the purpose of improving the measurement accuracy. The image region extraction method, quick feature points extraction method, and others parameters measuring methods were proposed. In addition, experiments were performed on the built platform. According to the results, the thread lead is 3 980.8 μm, the large diameter is 65 435.6 μm, the small diameter is 60 669.4 μm and the tooth-form height is 2 383.1 μm, meeting the demand of 4-class threaded precision, which can prove the correctness and feasibility of the method.