MOLTEN STEEL LEVEL CONTROL DEVICE OF CONTINUOUS CASTING DEVICE FOR THIN SHEET

摘要

PURPOSE:To prevent the generation of a cold shut on the surface of an ingot by providing a control system having a high response speed so that level fluctuations can be decreased particularly with a high frequency component. CONSTITUTION:A molten steel level 18 is detected by a level sensor 12. The level signal enters a signal processing system 13 from which the frequency component, for example, the level fluctuation component below 2 seconds fluctuation period is fed to the control system 9 and the low frequency component, for example, the level fluctuation component above 2 seconds fluctuation period is fed to a stopper position control system 11. The level fluctuation period of about =2 seconds is fed as the high frequency component to the control system 9 in this embodiment. The control system 9 makes pressure control in a tundish 5 at a high speed of about =1 second time constant to suppress the fluctuation width of the level within an extremely small range.