A METHOD IN A DEVICE FOR IMPROVED WEB INSPECTION OF ROLLING COILS IN ROLLING MILLS

摘要

The invention relates to a method in an apparatus for improved web inspection of rolling coils in rolling mills. The method comprising the steps of determining the rolling Speed from the Analog voltage signal representing a speed signal; inputting the analog signal into a microcontroller for converting and outputting corresponding digital signal; establishing a relation between current rolling speed and line rate; calculating a current line rate based on the established relation; updating at least one of two cameras corresponding to the current line rate when it differs from the provisions line rate beyond a threshold value; providing a display device to exhibit the current line rate including the cameras exposure time; automatically controlling including adjusting the camera exposure time based on the average gray value of the image, if the previous line rate deviates from a threshold tolerance valve; generating a sync cycle in different modes in the timing cycles through two each channels of at least solid two cameras.