JPS6272454A - Abnormality monitoring device for holding furnace for horizontal and continuous casting - Google Patents

Abstract

PURPOSE:To improve the accuracy of a molten metal temp. and to sense the leakage of the molten metal from a holding furnace by providing >=2 thermocouples. CONSTITUTION:The signals from the two thermocouples 3a, 3b are connected to respective thermometers 9a, 9b in which upper and lower limit temps. are respectively set. A voltmeter monitor device 11 checks the voltages impressed to inductor coils 7a, 7b and emits an alarm when the voltages deviate from the set conditions. A molten metal leakage detector 12a makes short circuiting and emits an alarm when the molten metal arrives at the coil 7a or 7b by passing through refractories in an inductor 5. Sensors 14a, 14b are short-circuited by the solidified molten metal drops on a tray 13a when the molten metal leaks from the inductor 5 in the upper part of the tray and the molten metal drops fall thereon. Then a molten metal leakage detector 12b emits an alarm.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a holding furnace for horizontal continuous casting, and in particular to an abnormality monitoring device that enables unmanned monitoring during holidays and casting stoppages6. [Prior Art] Figure 4 shows a cross-sectional view of a conventional holding furnace for horizontal continuous casting and an abnormality monitoring device. Pair 4 is a 7 flange that closes the opening after completion of casting, 5 is an inductor that heats the molten metal 2vi in the holding furnace 1, and 6 is a flange that closes the rear opening of the inductor 5. 7a and 7b are inductor coils that apply electromagnetic induction heating to the molten metal; 8 is a fan that cools these coils; 9 is a thermometer for the thermocouple 3; 1
0 is a fan monitoring device % 15a and 15b are cooling water passages for cooling the coils 7a and 7bi.

The above abnormality monitoring device checks the signal kJ: of the thermocouple 3 with a thermometer 9 equipped with a lower limit alarm, and issues an alarm if the temperature deviates from the set point. Further, a fan monitoring device 10 attached to the cooling fan 8 is configured to issue an alarm if the fan 8 stops due to any abnormality 7D1.

Conventional abnormality monitoring devices are configured as described above, so if there is another abnormality, for example, the thermocouple 3 has deteriorated and the accuracy is out of order, or the actual temperature is also high, the molten metal will be detected. The temperature drops and the molten metal solidifies in the holding furnace 1. In the opposite case, the temperature rises too much and franc)4
This will cause leakage of hot water from the joint surface between the housing 6 and the holding furnace 1.

Or an inductor coil? If the voltage applied to a and 7b is not directly set and is low, solidification will occur.

In the opposite case, there was a risk that the inductor coils 7a and 7bi would be burnt out, resulting in solidification in the holding furnace 1. Furthermore, it is also conceivable that the cooling water in the coils 7a and 7b may be blocked by internal water scale or the like. In this case, is it a coil? (Don't burn it out;) 3. [The shortcomings that the invention is trying to solve] Once the abnormality monitoring device as described above is placed in the holding furnace, it will always retain the molten metal for at least several months. I'll keep it. This is because if you drain the remaining hot water every weekend and empty the field, it will take several days to start the next week, which is not efficient. Will this melt the weekend? It is common practice to keep the minimum amount of molten metal remaining until the following week. However, there are problems with the conventional monitoring device, such as the need for an operator to check the entire status of the holding furnace at regular intervals.Does this invention have the above-mentioned problems? To solve the problem 7゜: The purpose is to obtain an abnormality monitoring device for the holding furnace for continuous casting in Kamihira, which allows central monitoring to be carried out remotely without having to approach the C holding furnace during casting stoppages or holidays. shall be.

〔problem? Means to solve]

The abnormality monitoring device according to the present invention includes a plurality of heat': +i71
In addition to monitoring the voltage abnormalities of the inductor coil and monitoring the cooling water, check if there is an abnormality in the water or oil. [Function] The abnormality monitoring device in this invention is equipped with two or more thermocouples. As a result, abnormalities in the voltage applied to the inductor coil with high accuracy of molten metal temperature, leakage of cooling water I-Cy4 and inductor coil, and leakage of hot water from the holding furnace to the flank and from the inductor to flank 2 [all 1 hot water leaks were detected] can do.

〔Example〕

An embodiment of this invention will be explained below with reference to the drawings.
In Fig. 1, the same reference numerals as in Fig. 4 indicate all the same parts.
With the U-kotsu'0 thermocouple, from these thermocouples 3a and 3b, -
The thermometers are connected to the respective thermometers 9a and 9b, and upper and lower temperature limits (2) are set respectively for the thermometers.

A total of 9a and 9b are wired in parallel, and one temperature, 1. This is so that even if the lf meter breaks down, the other thermometer can still operate. 11 is an inductor coil 7a.

12a is a voltage abnormality monitoring device that checks the voltage applied to 7h and issues an alarm if it exceeds the set conditions; one end of the circuit 12a is connected to inductor coils a and 7b, and the other side is connected to the molten metal 2. 9 leak detection when 4, 1 inductor 5
If the molten metal reaches the coil 7a or 7bj through the refractory industry (molten metal leaks from the inductor),
PJ path short circuit alarm? The emitting stones 1.143~14d/i are made of nichrome wire, etc. t, h (lrA) is a leakage detection sensor. 13a is a large tray with 14 resistances placed below the inductor 5, and the sensors 14a and 14b are connected to the tray 13a. 1 placed on top, and 13b: ・Sat Fran) 4, T) With the tray of as many large objects placed below, sensor 1
4 C, l 4(1・,.

It is mentioned on Sea 13b. Then 2 and above, 1[, se/
The sensors 14a and 14b are connected to the hot water leak detection device 12b;
5ia, and the sensors 14c and 14d are connected to the hot water leak detection sensor 112c.

Fig. 3 is a side sectional view and a plan view of the tray 13a and the sensor 14a (LH), in which the sensors 14a, 14:+ are placed at a distance and do not interfere under normal conditions. When a leak occurs from the inductor 5 of the inductor 5 and the hot water heater 16 falls, the tray (by the coagulating hot water water heater 17, the sensors 14a, 14b, 7;
``A short circuit caused the hot water leak detection device 12b to issue seven alarms! 61. Figure 2 is a cross-sectional view of five inductors. The water flow through which the cooling water is flowing is measured by the valves 13a and 18bk of the water generators 13a and 18b, and sent as a signal to the flow rate monitoring devices 19a and 19b, which issues an alarm in the event of an abnormality.

In the example, the water semi-continuous casting holding tank 'Pke 1 (de'-
Shi...

As I explained, other general people's capacity is old-fashioned low! ,! Ij
(A similar effect can be obtained in the jl melting furnace.However, the monitoring device can be used not only during holidays and during casting stoppages, but also during casting.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to monitor abnormal voltages of multiple thermocouples and inductor coils, monitor the total amount of cooling water, inspect abnormalities in water amount, and detect leakage of hot water from the holding furnace. The reliability of the thermometer in the holding furnace has been improved, and leakage of hot water and abnormalities in the inductor can be detected by remote control, thereby improving the safety of the equipment.

This has the effect of eliminating the need for inspection patrols on holidays.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a holding furnace for horizontal continuous casting and an abnormality monitoring device according to an embodiment of the present invention, Fig. 2 is a block diagram of an inductor cooling section, and Fig. 3 is a side sectional view and a plan view of a metal leakage sensor. , FIG. 4 is a sectional view of a conventional abnormality monitoring device. 1... Holding furnace, 2... Molten metal, 3... Thermocouple, 5...
...Inductor, 7a, 7b...Inductor coil,
8...Cooling fan, 9a, 9b...Thermometer, 10
... Cooling fan monitoring device, 11... Voltmeter monitoring device, 12a-12C... Hot water leak detection device, 14a-14
d... Hot water leak detection sensor, 19a, 19b... Cooling water flow rate monitoring device. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Masuo Oiwa01゜N＼I

Claims (1)

[Claims] Thermocouples for measuring the temperature of molten metal installed in at least two locations in the holding furnace, thermometers with upper and lower limits set for the voltage applied to the holding furnace, and sensors capable of detecting leakage of molten metal in at least three locations. An abnormality monitoring device for a holding furnace for horizontal continuous casting, characterized by comprising a device that issues an alarm when an inductor cooling fan stops, and a device that can monitor the amount of inductor cooling water.