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US 4,222,506 AGranted
Molten steel outflow automatically controlling device
AssigneeSumitomo Metal Industries, Ltd.
InventorsTsutomu Sakashita, Isao Yamazaki
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AssigneeSumitomo Metal Industries, Ltd.
InventorsTsutomu Sakashita, Isao Yamazaki
Estimating the term…
A molten steel outflow automatically controlling device comprising an infrared ray camera for detecting infrared rays emitted by a molten steel stream and slag flowing down out of a molten steel vessel such as a ladle or converter, a color monitor for converting the infrared rays emitted by the molten steel and slag into video signals with such infrared ray camera and for developing monitor picture images by color-printing the signals in two kinds, a signal discriminating device for making the two kinds of color picture images discriminating signals by the ratio of areas and a nozzle closing device for closing a nozzle for the outflow of molten steel of the molten steel vessel by such discriminating signal as is mentioned above, whereby, when the remaining amount of the molten steel in the molten steel vessel becomes small, the outflow of the slag will be detected and the nozzle for the outflow of the molten steel will be automatically closed to stop the pouring and to prevent the slag from mixing into the molten steel.
A device for controlling molten steel flowing out of a molten steel vessel through a nozzle provided thereon, comprising an infrared ray camera emitting a video signal for detecting infrared rays emitted by a stream of the molten steel and slag flowing out of the nozzle, control means operatively connected with the camera and including a color monitor for converting the wave length of the video signal sent from the camera into two different colors respectively for the molten steel and slag and for showing them in monitor picture images as scanning lines, the control means further including a signal discriminating means for making the two different picture images as discriminating signals by an area ratio thereof, and nozzle closing means operatively connected to the signal discriminating means and to the nozzle for closing the flow of the molten steel out of the vessel by closing the nozzle as determined by the discriminating means based on a predetermined value of the area ratio, whereby the nozzle is closed in response to the presence of slag in the flow from the nozzle.
Dependencies are inferred from the claim text.