Abstract
This paper is concerned with the new development of an electrode-type mold level sensor and a mold level control system with this sensor for continuous casting machines. The principle is based on the electrical conduction of powder floating on molten steel.The resistance between the mold powder and molten metal, which is proportional to the distance between the electrode and metal surface, is measured by the electrode inserted in the mold powder. A servo-device allows the electrode smoothly to follow the movement of the free surface of the molten steel. The mold level control system using this level sensor was analyzed by a simulation model. It was confirmed that the level sensor was able to accurately detect the movement of level for actual operation.The performance of the electrode-type level sensor is as follows: 1) measurement range: 500mm, 2) maximum follow-up control speed: 70mm/s, and 3) response time: 1s.It has been confirmed that the electrode-type level sensor makes possible the control of the molten steel level within±3.5mm, even when electrode-magnetic stirring is applied.
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