JPH0533918Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a protection device for a crucible-type induction melting furnace.

[Prior Art] As shown in Japanese Utility Model Application Laid-Open No. 54-94936, a conventional melt leak detection device for a crucible induction furnace uses a first melt leak detection electrode inserted into a melting chamber formed by a lining. , a fireproof wall formed in close contact with the outer periphery of the lining, one end fixed and electrically connected to a key point on the inner periphery of the coil, and the other end exposed inside or near the inside of the fireproof wall; and a hot water leak detection electrode connected to the first hot water leak detection electrode and the hot water leak detection electrode connected to the coil, the fireproof wall between each of the stylus is provided at the end of the first hot water leak detection electrode and the hot water leak detection electrode connected to the coil. There is a structure in which a flat metal member that almost covers the wall surface is fixed so as to be electrically connected to the stylus.

[Problems to be solved by the invention] Conventional systems detect leakage through a leakage detection electrode, and do not have a means to measure the temperature of the molten metal during heating or melting. It was not possible to monitor the temperature of the molten metal, and as a result, there was a fear that the molten metal would become overheated, or that the timing of detecting a leak would be delayed.

The object of the present invention is to provide a protection device for a crucible-type induction melting furnace that solves the above-mentioned problems of the conventional ones.

[Means for Solving the Problems] In order to solve the above problems, the present invention embeds an electrode wire in the bottom wall of a furnace consisting of a firing crucible that constitutes the furnace part of the crucible-type induction melting furnace. The lead-out terminal and the temperature detection means are connected to each other.

In this case, it is desirable to use a thermocouple as the temperature detection means and to connect an alarm device to this temperature detection means.

In addition, thermoelectric elements are used as temperature detection means,
It is desirable to connect a meter to this.

[Example] The present invention will be specifically described below based on an example of the present invention shown in FIG.

In FIG. 1, numeral 1 is a furnace consisting of a firing crucible. 2 is an electrode wire, and 1 is attached to a suitable place on the bottom wall 1a of the furnace 1.
One or more are embedded. Reference numeral 3 denotes a temperature detection means consisting of, for example, a thermocouple, which is connected to the terminal of the electrode wire 2.

Note that a thermoelectric element may be used as the temperature detection means 3, and an instrument connected to the thermoelectric element may be provided externally so that the temperature of the molten metal can be continuously measured.

An alarm device 4 is connected to the temperature detection means and is installed on an external monitoring panel or the like.

In addition, if the bottom wall of the furnace is worn out and its thickness is reduced, the temperature conditions will change. If the temperature is set to +50°C as the detection temperature, variations in operation can be improved.

5 is a coil provided on the outer peripheral side wall of the furnace 1, and 6 is an iron core provided on the outer periphery of this coil. 7 is a molten metal stored in the furnace 1.

[Operation] In the above configuration, when predetermined high-frequency alternating current power is supplied to the coil 5, the object to be heated in the furnace is induction heated and melted by the induced magnetic field based on this power, and becomes the molten metal 7.

By the way, measuring the temperature of the molten metal being melted during heating in such a melting furnace has been considered difficult and has not been done at all.

For this reason, there was a risk that the molten metal would become overheated or that the furnace wall would crack, causing a leakage of the metal.

In the induction melting furnace of the present invention, when such overheating or leakage occurs, the temperature detecting means 4 detects the high temperature state caused by the overheating or leakage through the electrode wire 2 arranged on the bottom wall of the furnace 1. It is detected immediately and the alarm device 6 is activated.

Therefore, an external administrator can immediately know about overheating or hot water leakage.

Note that when a thermoelectric element is used as the temperature detection means and the temperature is detected according to the output current of the thermoelectric element, the temperature of the molten metal can be continuously measured and reported to the outside.

[Effects of the invention] In the crucible-type induction melting furnace of the present invention, an electrode wire is embedded in the bottom wall of the furnace consisting of a firing crucible that constitutes the furnace part of the crucible-type induction melting furnace, and the lead terminal of the electrode wire and the temperature Since it is configured to be connected to the detection means, it has the following excellent features.

Embedding electrode wires in the bottom wall of the furnace requires simple construction, and it is also easy to embed multiple electrode wires in appropriate locations on the furnace wall, so overheating of molten metal and leakage can be detected quickly and accurately using multiple pieces of information. can be detected.

When a thermocouple is processed and an alarm device is connected to the thermocouple, by selecting the set temperature of the alarm device, it is possible to issue an alarm at a warning temperature before overheating, and safe operation management of the furnace is possible.

In addition, when a thermocouple is used and a meter is connected to the thermocouple, the temperature of the molten metal can be continuously monitored by an external administrator, thereby enabling appropriate operational management.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention. 1...furnace (firing crucible), 2...electrode wire, 3...
...Temperature detection means, 4...Alarm device.

Claims (1)

[Claims for Utility Model Registration] 1. An electrode wire is embedded in the bottom wall of a furnace consisting of a firing crucible that constitutes the furnace part of the crucible-type induction melting furnace, and the lead-out terminal of this electrode wire is connected to a temperature detection means. A protection device for a crucible-type induction melting furnace, characterized in that: 2. The protection device for a crucible induction melting furnace according to claim 1, wherein a thermocouple is used as the temperature detection means and an alarm device is connected to the temperature detection means. 3. The protection device for a crucible-type induction melting furnace according to claim 1, wherein a thermoelectric element is used as the temperature detection means, and a meter is connected to the thermoelectric element.