Method and a device for detecting slag
OwnerMats Jalk, Willy Ohlsson +1inventors
InventorsMats Jalk, Willy Ohlsson, Håkan Kelvesjö
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Abstract
The invention relates to a method and a device of detecting the presence of slag in a shroud (4) through which molten metal passes from a ladle (2) to a tundish (6). A transmitting coil (20) generates an electromagnetic field. An induced voltage generated at a receiving coil (24) is compared with a defined voltage range. If the induced voltage has a value outside the defined voltage range it is indicative of the presence of slag. The coils (20,24) are arranged in an unmovable manner in relation to the shroud. The invention also relates to a casting plant.
Claims29
A method of detecting the presence of slag in a shroud for guiding molten metal from a ladle to a tundish, comprising:
- providing a forked coil holder having at least two branches;
- mounting at least one transmitting coil to a first branch and at least one receiving coil to second branch of the forked coil holder;
- mounting said forked coil holder to a shroud manipulator adapted to manipulate the shroud;
- placing the forked coil holder in such manner that an imagined straight line drawn between the transmitting coil and the receiving coil crosses the shroud;
- generating, by means of said transmitting coil, an electromagnetic field that enters the shroud and its contents;
- generating an induced voltage by means of said receiving coil which is subjected to the electromagnetic field having entered the channel and its contents, wherein said induced voltage is indicative of the presence or absence of slag in said contents;
- and
- keeping the coils unmovable relative to the shroud.
A method of detecting the presence of slag in a channel for guiding molten metal, comprising:
- generating, by means of at least one transmitting coil, an electromagnetic field that enters the channel and its contents;
- generating an induced voltage by means of at least receiving coil which is subjected to the electromagnetic field having entered the channel and its contents, wherein said induced voltage is indicative of the presence or absence of slag in said contents;
- generating said electromagnetic field so that it enters a shroud and its contents, the shroud being said channel for guiding molten metal from a ladle to a tundish, and by keeping the coils unmovable relative to the shroud.
A device for detecting the presence of slag in a shroud for guiding molten metal from a ladle to a tundish, comprising:
- at least one transmitting coil for generating an electromagnetic field to be entered into the shroud its contents;
- at least one receiving coil for receiving the electromagnetic field that has entered the shroud and its contents, and for generating an induced voltage, wherein said induced voltage is indicative of the presence or absence of slag in said contents;
- a shroud manipulator adapted to manipulate the shroud;
- a forked coil holder mounted to the shroud manipulator and having at least two branches, a first branch carrying said at least one transmitting coil and a second branch carrying said at least one receiving coil, the two branches being placeable in such manner that the shroud is located between them and that said at least one transmitting coil and said at least one receiving coil are in a stationary position in relation to the shroud.
A device for detecting the presence of slag in a channel for guiding molten metal, comprising:
- at least one transmitting coil for generating an electromagnetic field to be entered into the channel and its contents;
- at least one receiving coil for receiving the electromagnetic field that has entered the channel and contents, and for generating an induced voltage, wherein said induced voltage is indicative of the presence or absence of slag in said contents;
- characterized by a coil holder arrangement that is adapted to hold said at least one transmitting coil in such manner that the generated electromagnetic field enters a shroud and its contents, the shroud being said channel for guiding molten metal from a a tundish, and to hold said at least one coil and said at least one receiving coil in position in relation to the shroud.
Dependencies are inferred from the claim text.