JPH032578B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a hot water leak detection device in an induction heating device for a tundish furnace.

[Prior Art] In an induction heating device for a tundish furnace for continuous casting, as shown in Japanese Patent Application Laid-open No. 61-38754, if there is a leak in the tundish furnace, it may cause a serious accident. Therefore, it is necessary to install a hot water leak detection device, and FIG. 2 shows a conventional hot water leak detection device.

Reference numeral 1 designates a tundish furnace for storing molten metal therein, and 2 designates an induction coil for heating, and the induction coil 2 and the molten metal are isolated and insulated by a cylindrical wall surface 3. As a hot water leak detection device, a detection sensor 4 consisting of a cylindrical electrode provided in the cylindrical wall surface 3 so as to cover the periphery of the induction coil 2
, an electrode 5 called an antenna provided on the bottom surface in contact with the molten metal in the tundish furnace 1, and a melt leak detector 6 connected between the detection sensor 4 and the electrode 5. By providing such a leak detection device, if a crack occurs in the wall surface 3 and the molten metal in the furnace 1 passes through the crack and reaches the detection sensor 4, the molten metal in the crack will be detected. The sensor 4 and the electrode 5 become electrically connected. By detecting this conduction state with the leakage detector 6, leakage of the molten metal is detected. 7 is an immersion nozzle for pouring molten metal, and 8 is a mold.

[Problems to be Solved by the Invention] In the conventional hot water leak detection device as described above, it is necessary that the electrode 5 and the molten metal be in reliable electrical contact. However, although the electrode 5 is made of a heat-resistant material, it is susceptible to thermal deterioration and damage due to high temperatures, and due to poor installation of the refractory material in the part where the electrode 5 is embedded, the electrode 5 may be covered with a refractory material. Sometimes I get lost. In such a case, even if the boiling water as mentioned above occurs,
There was a problem in that the non-contact between the electrode 5 and the molten metal made it impossible to detect a leak.

[Means for Solving the Problems] The leak detection device of the present invention covers the outer periphery of a heating induction coil in a leak detection circuit for a tundish furnace that continuously pours metal into a conductive mold through a nozzle. A sensor installed in this manner,
The apparatus further includes a hot water leak detection means for detecting a state of conduction between the sensor and the mold.

[Function] According to the above configuration, when a crack or the like occurs on the furnace wall surface and the molten metal passes through this crack and reaches the sensor means, the molten metal in the tundish furnace and the sensor are brought into conduction via the molten metal in the crack. Become. On the other hand, the molten metal in the tundish furnace and the molten metal in the mold are electrically connected through the molten metal passing through the nozzle. Therefore, when a difference in hot water occurs due to the occurrence of cracks, etc., the sensor means and the mold become electrically connected, and this electrically conductive state is detected by the hot water leak detection means.

[Embodiment] FIG. 1 shows an embodiment of the hot water leak detection device of the present invention, and the same parts as in the conventional example shown in FIG. 2 are given the same reference numerals.

One terminal of the hot water leak detector 6, which consists of a DC power supply 6a and a galvanometer 6b, is connected to the induction coil 2.
The other terminal of the hot water leak detector 6 is connected to the main body of a mold 8 made of a conductor.

With this configuration, if a crack occurs in the cylindrical wall surface 3 and the molten metal in the furnace passes through the crack and reaches the detection sensor 4, it will be detected as the molten metal in the furnace 1 via the molten metal in the crack. The sensor 4 becomes electrically conductive. On the other hand, since the molten metal in the tundish furnace 1 and the mold 8 are electrically connected via the molten metal in the immersion nozzle 7 and the molten metal in the mold 8, the detection sensor 4
and the mold 8 are brought into conduction. As a result, a current flows through the galvanometer 6b and the molten metal detector 6 operates, thereby making it possible to detect the leakage of molten metal that has occurred on the cylindrical wall surface 3.

[Effects of the Invention] According to the present invention, since the conductive mold body that is electrically connected to the molten metal through the nozzle and the molten metal in the mold is used as an electrode for electrically contacting the molten metal, Unlike conventional hot water leak detection devices, there is no need to install electrodes inside the furnace.
Furthermore, it is no longer possible to detect the hot water pitcher due to deterioration of the electrode.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of the hot water leak detection device of the present invention, and FIG. 2 is a diagram showing the configuration of a conventional hot water leak detection device. 1...Tandate furnace, 2...Induction coil,
3... Cylindrical wall surface, 4... Detection sensor, 6... Hot water leak detector, 6a... DC power supply, 6b... Galvanometer,
7... Nozzle, 8... Mold.

Claims (1)

[Claims] 1. In a hot water leakage detection circuit for a tundish furnace that continuously pours hot water into a conductive mold through a nozzle, there is continuity between a sensor provided to cover the outer periphery of a heating induction coil, and the sensor and the mold. A hot water leak detection device comprising a hot water leak detection means for detecting a state.