| 摘要 |
PURPOSE:To prevent the falling of scale and to simplify the operation for removing the same by inserting balloon members into the aperture of a hearth, filling fluid therein to close the aperture and fixing the same into the aperture. CONSTITUTION:Two pieces of the balloon members 14, 14' are inserted via pneumatic hoses 17 and adapter hoses 15 into the aperture 2 of the hearth refractories after the inside of a furnace cools down. Heat resistant rubber (about 90 deg.C heat resisting temp. and about 5mm wall thickness) is used for the balloon members 14, 14'. Compressed air is then fed into the balloon members 14, 14' to inflate the members and to maintain the hermetic state between a moving post 5 and the inside of the aperture 2. The inside pressure of the balloon members 14, 14' is maintained under about 0.2kg/m<2>. The male type adapters 18 are removed from the female type adapters 16 and the scale 13 sticking and depositing on the upper part and inside of a gate 3 is removed after the operation is made in the above-mentioned state. The falling of the scale 13 into a trough is thus prevented and the operation for removing the scale in the trough is simplified.
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