Distance control of air scraper nozzles in galvanizing lines

For corrosion protection, a protective layer of zinc is applied to the metal strip. To do this, the steel strip is passed through a zinc basin, which causes a thin layer of zinc to adhere. The applied zinc is evenly distributed and smoothed by air scraper nozzles. In order to achieve the desired thickness, precise distance control of the air nozzles is required. confocalDT sensors are used to measure the nozzle distances. The sensors enable precise distance measurements on highly reflective surfaces. Thanks to the high measuring rate, the distance between the air scraper nozzles is detected and readjusted with high dynamics.

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