| 摘要 |
PURPOSE: To cast a cast slab having uniform surface characteristic by measuring molten metal surface variating quantity in a mold at plural positions, controlling the current conducted to electromagnetic coils according to these deformed quantities and restraining the distance of the molten metal surface. CONSTITUTION: One pair of eddy current sensors 7a, 7b are symmetrically arranged at the upper part separated by the distance (y) from the molten steel (s) surface in the mold 1. The eddy current sensors are worked through an electric source 8 and the molten steel variating quantity at the measuring point on the molten steel surface in the mold is measured at the setting timing through a timer 9. The measured informations h1 , h2 of the molten steel surface variating quantity from the eddy current sensors 7a, 7b are simultaneously transmitted to a comparing part 10 and the differenceΔh of the molten steel surface variating quantity at the point is obtd. and the constant treatment is executed with a multiplier 11 and the kΔh is outputted to a comparator 12. The setting value and the kΔh are compared with this comparator 12. In the case the kΔh exceeds the permissible range, the change-over command signal of the conducting current is transmitted to an electric source control device to reduce the conducting current from the electric source 5.
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