PURPOSE: To adjust inflow of molten metal without exchanging molten steel nozzle etc., by changing the change nozzle of slide valve to a one having required diameter, and by fitting or removing an insert having the same hole diameter which the change nozzle has, at the flowing hole on the change nozzle.
CONSTITUTION: When nozzle diameter L of the slide valve is changed into L1 to change charging speed of molten steel to the mold, first of all partly melted change nozzle 15 is removed from slide plate 14. Then plate 14 is slid so that its hole may coincide with hole of fixed plate 13 and molten steel nozzle 12. After that, insert 16 having a diameter of L (=L1) is inserted into the holes of plate 13 and nozzle 12 through the hole of plate 14 so that one end of insert 16 may coincide with sliding surface of plate 13, and then insert 16 is fixed with mortar, etc. Then, plate 14 is moved towards the left and insert 16' having a hole diameter of L is inserted into the hole of plate 14 and fixed as mentioned above. After that, nozzle 15 having a hole diameter of L1 (=L) is fitted so that its axis may coincide with the axis of hole of plate 14.
TANAKA TOSHINOBU
TANAKA MITSUHIKO
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