CN1268456C - Warning device for preventing middle package from bleeding-out - Google Patents

Abstract

An alarm device for preventing steel leakage in a tundish, which is composed of a molten steel conducting element and an alarm. The alarm or the launching device outside the package is connected. The invention has the advantages of simple structure, accurate alarm, etc., and can prevent the occurrence of steel leakage accidents.

Description

Alarm device for preventing tundish leakage

technical field

The invention belongs to the technical field of metallurgy, and in particular relates to an alarm device for preventing steel leakage in a steelmaking and continuous casting tundish.

Background technique

Modern metallurgical production has changed the traditional way in the past, and widely adopts the short-process production process of "trinity" of steelmaking-continuous casting-hot delivery and direct rolling. Among them, the continuous casting process is the key process in the production process, and the continuous casting tundish is one of the indispensable important equipments when casting molten steel into billets of various predetermined specifications. Due to the different types of steel poured by continuous casting, different temperatures, and different specifications and shapes of casting slabs, different requirements are put forward for the performance of the tundish. Continuous casting requires its long life. However, because the inner lining of the tundish is subjected to the impact of high-temperature molten steel and the erosion of steel slag when the tundish is working, accidents of steel leakage in the tundish often occur. In the event of a tundish leakage accident, not only the ladle and the molten steel in the tundish will be lost, but also the leaked steel will be poured directly into the tundish trolley, crystallizer and the various parts below it because of the specific position when pouring steel. These facilities will be burned directly, and at the same time, due to the damage of the equipment, there will inevitably be a vicious accident of long-term shutdown, which will cause the entire steelmaking production line to be completely shut down for maintenance, resulting in very large economic losses. In order to prevent the occurrence of such incidents , generally adopts the method of artificial prediction, artificially predicts the critical position of tundish erosion, and repairs it regularly, but in fact there is still potential available, resulting in a certain degree of waste. In order to solve the occurrence of steel breakout accidents in the tundish, many metallurgists also started from improving the quality of the refractory lining in the tundish, by improving and changing the quality and material of the lining refractory, adding impact bricks and other means to meet the requirements of modern production for continuous casting. Tundish quality requirements. Although the results of the above research have improved the service life of the tundish and realized multi-furnace continuous casting, the problem of steel breakout accidents has not been fundamentally solved.

Contents of the invention

In order to prevent tundish leakage accidents, the present invention provides an alarm device for preventing tundish leakage.

The invention consists of two parts, a molten steel conduction element and an alarm, wherein the molten steel conduction element is made of two pieces of molten steel corrosion-resistant materials A and B, and the two pieces of molten steel conduction elements A and B are set in the continuous casting tundish to work In the refractory brick lining at the impact area of the first layer, the vertical distance between the two conduction elements A and B is 5-30mm, and they are respectively connected to the alarm or launching device outside the tundish through wires. When the refractory material on the upper part of the molten steel conduction elements A and B for collecting signals is seriously eroded, the A and B conduction elements are exposed in the molten steel. It is transmitted to the alarm (or transmitting device) located outside the tundish for direct alarm, or the transmitting device sends an alarm signal to the receiving device. When the operator receives the alarm from the alarm or the alarm signal from the transmitter, he will take measures to stop the operation and repair the continuous casting tundish, so as to avoid the occurrence of steel breakout accidents. In order to prolong the service life of the tundish and realize the uniform distribution of molten steel in the tundish, impact bricks or turbulence controllers are often placed in the impact zone of the tundish to buffer the direct erosion of the molten steel on the tundish. In this case, the alarm device can still be used. The specific method is shown in Figure 1. On the premise of impact bricks or turbulence controllers, the molten steel conducting elements A and B can be installed in the bottom wall of the impact bricks or turbulence controllers, and the vertical distance between the conducting elements A and B is still 5-30mm. connected to external circuits. Due to the complex working environment of the tundish, various electric wires (cables) are criss-crossed. In order to reduce the line, the alarm of this device also adopts wireless transmission and reception. Connect the molten steel conduction elements A and B for collecting signals with the transmitting device, install them on the tundish trolley or the operating platform, and install the receiving device in the operating room. The alarm component AB for collecting signals is embedded in the impact zone of the working layer of the tundish. Accompanying drawing 3 is the schematic circuit diagram of the transmitting device connected with the molten steel conduction elements A and B. Accompanying drawing 4 is the circuit diagram of receiving device. The molten steel conduction elements A and B in this device are one of the key components of the device. In order to make the whole device work normally, it is necessary to select materials resistant to corrosion by molten steel, such as high temperature resistant steel or graphite.

The invention has the advantages of simple structure, accurate alarm, etc. The economic benefit obtained by using the device is reflected in the form of improving the service life of the impact brick or the turbulence controller in the tundish and avoiding accidents. With the alarm device, the limit position can be reached every time the tundish is used, and it is guaranteed to be safe and steel-free. Every time the service life of the tundish or impact brick (turbulence controller) is increased, 2,000 yuan can be saved, and the tundish age can be increased by 5 times (140 tons per package). Taking a steel company as an example, it can save 21.6 million yuan per year. In continuous casting production, when a tundish steel leakage accident occurs, its economic loss consists of two parts. One is the direct economic loss, that is, the direct loss of molten steel in the tundish and the burning of the ladle, tundish trolley, crystallizer, electromagnetic stirring, spraying, etc. Second, the severe damage to the equipment during steel leakage will inevitably cause a vicious accident of long-term production stoppage. Due to the different cast steel types and continuous casting machine models, the economic loss ranges from several million yuan to tens of millions yuan. The use of this alarm device can completely prevent the occurrence of steel leakage accidents.

Description of drawings

Fig. 1 is the structural schematic view of the present invention for setting impact bricks or turbulence controllers in the impact zone of the tundish,

Fig. 2 is a kind of alarm circuit schematic diagram that the present invention adopts,

Fig. 3 is a schematic diagram of a transmitter circuit connected to the molten steel conduction element used in the present invention,

Fig. 4 is a circuit schematic diagram of the receiving device adopted in the present invention.

In Figure 1: 1. Impact brick or turbulence controller; 2. Spreading material; 3. Bottom brick; 4. Tundish wall; 5. Tundish permanent layer

Detailed ways

The overall structure of the present invention is shown in Figure 1. When the impact brick or turbulence controller is set in the impact area of the tundish, the molten steel conduction element is installed in the impact brick or the bottom wall of the turbulence controller to communicate with the outside world through the wire. connected to the alarm. As shown in Figure 2: the alarm consists of power supply P, manual shape switches SA1 and SA2, voltmeter PV, indicator light HB and red indicator light HL, molten steel conduction element AB, time relay KT, delay melting point KT1, relay KA, Contact switch KA1, alarm HZ and related wires. Among them, the power supply P, manual switch SA1 and indicator light HB are connected in series to form the basic circuit of the whole device, the voltmeter PV is connected in parallel with the indicator light HB, the molten steel conduction element AB is connected in parallel with the manual switch SA2 and then connected with the time relay KT Connected in series, the two ends of the formed circuit are connected in parallel with the indicator light HB, the alarm HZ is connected in parallel with the red indicator light HL and then connected in series with the electric shock switch KA1, and the two ends of the formed circuit are connected in parallel with the indicator light HB Together, the two ends of the circuit formed by the delay electric contact switch KT1 being connected in series with the point electrical appliance KA and the indicator light HB are connected in parallel, and the manual switch SA1 is the main switch of the entire circuit.

The circuit system formed by the above connection method can realize the steel breakout prediction of the continuous casting tundish, wherein the molten steel conduction element AB is installed in the refractory brick lining of the impact area of the working layer of the continuous casting tundish, and is connected with the wire through the Alarm (transmitter) device connection. The specific working principle is:

After the manual switch SA1 is closed, the voltmeter PV displays the voltage and capacity, and the indicator light HB is on. When the refractory material on the upper part of the molten steel conduction element AB that collects the signal is seriously eroded, the molten steel conduction element AB is exposed in the molten steel, and under the action of liquid steel, AB conducts, and the time relay KT will automatically pull in, and the delay will start. The hour contact KT1 is closed, the instantaneous relay KA is closed, the KA1 contact is closed, the alarm HZ alarms, and the red indicator light HL is on. At this time, the operation must be stopped as soon as possible, and the maintenance of the continuous casting tundish should be started, so as to avoid the occurrence of steel breakout accidents.

After turning on the manual shape switch SA1, the alarm will be released. Closing the manual shape switch SA2 is equivalent to the conduction of AB. If the alarm sounds immediately, it means that the alarm device is in good condition, so you can check whether the system is working normally. Turn on the manual switch SA2, and the monitoring equipment will immediately enter into a new round of working state.

Claims (4)

1. An alarm device for preventing steel leakage in the tundish, which is characterized in that it consists of two parts, a molten steel conducting element and an alarm, and two molten steel conducting elements (A, B) are arranged on refractory bricks in the impact area of the working layer of the tundish The liner is connected to the alarm or launcher outside the tundish through wires, and the vertical distance between the two molten steel conduction elements (A, B) is 5-30mm. 2. The tundish leakage alarm device according to claim 1, characterized in that when an impact brick or a turbulence controller is placed in the impact area of the tundish, the molten steel conduction element of the device is set in the impact brick or the turbulence control In the bottom wall of the device, the molten steel conduction element is connected with the external alarm or launching device through the wire. 3. The tundish steel leakage alarm device according to claim 1, characterized in that when the alarm of the device adopts a wireless transmission and reception mode, the molten steel conduction elements (A, B) of the collected signal and the emission outside the tundish are connected. The devices are connected, the transmitting device can be installed on the tundish trolley or the operating table, and the receiving device can be installed in the operating room. 4. The tundish leakage alarm device according to claim 1, characterized in that said molten steel conduction element is made of conductive material resistant to corrosion by molten steel.

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