The new detection system for missing bearing's rolling elements in double row ball bearing

In the assembly process of double row ball bearing, the lack of rolling elements is the most serious deficiency problems. The current equipment based on machine vision technique can only detect single row except double-row one. This paper establishes a new detection method and system to supply a gap. The detection system uses digital image processing technology to finish identification for the lack of rolling elements quickly and accurately. Firstly, multiple concentric annulus are used to locate precise position of the bearing; and then the image is scanned in the direction of roundness- expansion to extract rolling elements area and the number of rolling elements are counted by statistics. Finally, the position of missing rolling elements is located by standard block scanning, and it will used to display marked result after coordinate transformation. Experiments has shown that the system is efficient, strong anti-interference, etc., have a good prospect of industrial application.