JPH0641117Y2 - Protection device for crucible induction melting furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a protective device in a crucible induction melting furnace.

[Prior Art] An automatic material melting system using a crucible type induction melting furnace
Until now, it has been practically practically not used because of the difficulty in operation control of its dissolution.

Therefore, in the present situation, there is no prior art for the protection device for the molten metal leaked from the furnace wall of the crucible type induction melting furnace.

[Problems to be Solved by the Invention] The present invention aims to provide a protection device for a crucible-type induction melting furnace, which solves the above-mentioned problems in view of the present situation.

[Means for Solving the Problems] According to the present invention, the crucible-type induction melting furnace has a furnace wall having a double structure in which a furnace refractory and a firing crucible are laminated, and a heat insulating sheet is provided around the middle of the furnace wall. The present invention relates to a protective device in a crucible type induction melting furnace in which a temperature detecting means is arranged.

[Embodiment] The present invention will be specifically described below based on an embodiment of the present invention shown in Figs.

In FIG. 1, 1 is, for example, a furnace wall refractory made of stamp material, 2 is a firing crucible, the former forming the inner wall of the furnace wall and the latter forming the outer wall. Reference numeral 3 is a bottom refractory material. Reference numeral 4 denotes a heat insulating sheet, which is provided between the side walls of the furnace wall refractory 1 and the firing crucible 2 as shown in an enlarged view of the relevant portions in FIG. 5 is, for example, a temperature detecting means composed of a thermocouple,
This is arranged between the heat insulating sheet 4 and the furnace wall refractory material 1 at a plurality of (for example, 3 to 4) outer circumferences of the furnace wall refractory material 1 at appropriate intervals. An alarm device 6 is connected to the temperature detecting means, and is installed on a monitoring board or the like provided outside. In addition,
If a thermoelectric element is used as the temperature detecting means, the temperature of the molten metal can be continuously measured from the outside, and a function of activating an alarm device whose temperature has risen due to leakage of the molten metal can be provided. Reference numeral 7 is a coil provided on the outer peripheral side wall of the firing crucible 2, and 8 is an iron core provided on the outer periphery of the coil. Reference numeral 9 is a molten metal contained in the furnace wall refractory 1 which is an inner wall.

[Operation] In the above configuration, when AC power of a predetermined high frequency is supplied to the coil 7, the object to be heated in the furnace is induction-heated and melted by the induction magnetic field based on this power to become the molten metal 9.

By the way, the molten metal melted in such a melting furnace is agitated by an electromagnetic pump (not shown) or the like to keep its temperature,
Although pouring of molten metal is controlled in the next process, molten metal may leak during such stirring or due to cracks in the furnace wall.

Even if the molten metal leaks due to various causes as described above, in the induction melting furnace of the present invention, a plurality of temperature detecting means 5 are embedded at appropriate places on the outer periphery of the furnace wall, so that the high temperature state due to the molten metal leak may occur. Immediately detected, the alarm device 6 is activated, and the external manager can immediately know this hot water leak. In the case of using a thermoelectric element as the temperature detecting means, the temperature of the furnace can be measured continuously, though indirectly, by the thermoelectric element.

[Effects of the Invention] In the crucible-type induction melting furnace of the present invention, the furnace wall of the crucible-type induction melting furnace is constructed by laminating the furnace wall refractory and the firing crucible, and the heat insulating sheet and the temperature detecting means are provided between them. It has the following excellent features because it is configured by arranging.

With a simple structure, molten metal leakage can be detected quickly and accurately.

Even if the molten metal leaks, there is no danger that the high-temperature molten metal will immediately flow out because the furnace wall has a double structure as described above.

In the case of using the thermoelectric element as the temperature detecting means, the temperature change of the molten metal can be measured, so that the leakage of the molten metal can be detected at the initial stage.

[Brief description of drawings]

1 and 2 are longitudinal sectional views showing one embodiment of the present invention.
Among them, FIG. 2 is a longitudinal sectional view in which an essential part is enlarged and drawn. 1: Furnace wall refractory 2: Firing crucible 4: Thermal insulation sheet 5: Temperature detection means 6: Alarm device

Claims (3)

[Scope of utility model registration request] 1. A crucible-type induction melting furnace, wherein the furnace wall has a double structure in which a furnace refractory and a firing crucible are laminated, and a heat insulating sheet and a temperature detecting means are arranged on the outer periphery of the furnace wall between the two. A protection device in a crucible-type induction melting furnace, characterized in that 2. A plurality of thermocouples are used as temperature detecting means by arranging them at appropriate positions on the outer circumference of the middle furnace wall, and an alarm device is connected to the temperature detecting means.
A protection device in the crucible-type induction melting furnace described. 3. A crucible-type induction melting apparatus as set forth in claim 1, wherein a thermoelectric element is used as a temperature detecting means by arranging it at a proper position on the outer periphery of the intermediate furnace wall, and an alarm device is connected to the temperature detecting means. Protective equipment in the furnace.