A device for recognizing and correcting star wheel datum based on Machine Vision

Star wheel is a key component in the uniform speed universal joint of automobile steering structure. It is used for power transmission between any pair of rotating shafts whose axes intersect and their relative positions often change. With the popularization of intelligent manufacturing and automatic production line, the automatic detection of star wheel has important practical value. The correct placement of the star wheel directly affects the subsequent automatic measurement results, which is on the automatic detection line. The accurate and fast identification of the datum is the key factor to determine whether the star wheel can realize the automatic measurement and the measurement speed. This system takes Mitsubishi FX3GA-24MT-CM PLC as the core to design the star wheel datum recognition and correction device. Based on the machine vision image processing algorithm to accurately identify the datum level, the mechanical structure of transmission and correction is designed, as well as the PLC electrical control system to complete the automatic transmission, recognition and correction of the star wheel. The test results show that the recognition rate of the system is above 96%, and the detection time is 0.581s, which meets the technical requirements of the star wheel detection line.