KR20000013469U - Tundish cross start device for continuous casting equipment - Google Patents

Abstract

The present invention is a continuous casting facility configured to contribute to the improvement of quality and operation stability of the ultra-thin castings by securing molten steel in the tundish and forming molten steel in the mold in the state of separating and removing inclusions during the initial casting of the continuous casting facility. Relates to a tundish cross start device.

The present invention receives the molten steel from the ladle 1 in the tundish 12 and stores the molten steel through the upper nozzle 22, the lower plate 28, the lower nozzle 24, and the immersion nozzle 25. In the continuous casting facility for continuous casting by injecting into the mold 13, an argon gas supply line controlled by the solenoid valve 35-b is connected to the upper nozzle 22,

The refractory porous portion 40 is installed at the portion where the tungsten cross reaches the molten steel from the inside of the tundish cross of the lower plate 28 and is controlled by the solenoid valve 35-a in the porous portion 40. Provides a tundish cross start device for continuous casting equipment characterized by the configuration of connecting argon gas supply lines.

Description

Tundish cross start device for continuous casting equipment

The present invention provides continuous casting facilities that can improve the quality and operation stability of ultra casts by securing molten steel in the tundish and forming molten steel into molds in the state of separating and removing inclusions during initial casting of continuous casting equipment. Relates to a tundish cross start device.

Generally, as shown in FIG. 1, the continuous casting facility receives molten steel from the ladle 11 in the tundish 12 and stores the molten steel in the tundish 12 in the mold 13 to continuously cast the molten steel. It is supposed to be done.

In such a continuous casting facility, the tundish 12 carries out continuous casting operations such as distributing and injecting molten steel into the mold 13 and separating and injecting the molten steel into the mold 13. It plays a role.

There are two methods of controlling molten steel injection into the mold 13 from the tundish 12, a stopper type and a sliding nozzle type.

In the sliding nozzle type, the hydraulic cylinder receives the molten steel level detection value in the mold and operates the sliding nozzle to control the injection of the molten steel into the mold. However, in the molten steel injection control of the conventional sliding nozzle type, when the molten steel is injected, the tundish sliding nozzle injects molten steel into the mold 13 while securing about 6 to 7 tons of molten steel in an open state. At this time, various foreign matters are present in the tundish 12, and molten steel is injected into the mold 13 in a state in which the temperature of the molten steel is not sufficiently secured, thereby causing poor quality of the ultra cast. In addition, in order to secure a certain amount of molten steel in the tundish 12, as shown in FIG. 2, the cone 20 is installed on the well block 21. When the tish dish is preheated, the cone 20 is melted and cast. Incapacity is frequent. In addition, workers are concerned that the cone 20 is melted, so the tundish preheating temperature is not sufficiently secured often causes nozzle clogging during casting, and the cost of the installation of the cone 20 is considerable.

The present invention has been studied to solve the conventional problems as described above, its purpose is to secure a certain amount of molten steel in the tundish during the initial casting operation in the continuous casting equipment, and to make the tundish molten steel in the state of separating and floating the inclusions It is to provide a tundish cross start device of continuous casting equipment that can greatly improve the quality of ultra-thin castings and bring about stabilization of operation by injecting into a mold.

1 is a configuration diagram of a continuous casting facility associated with the present invention,

Figure 2 is a sectional view excerpts of the conventional tundish,

Figure 3 is a cross-sectional view of the tundish cross start apparatus according to the present invention,

4 is a detailed view showing the main portion of the present invention,

Figure 5 is a flow chart of the tundish cross start device of the present invention.

Explanation of symbols on the main parts of the drawings

11: ladle 12: tundish 13: mould

20: cone 21: well block 22: upper nozzle

23: upper plate 24: lower nozzle 25: immersion nozzle

28: lower plate 26-a, 26-b: argon gas supply pipe

27-a Coupling 30-a Flexible Hose 31 Tee Bow

32-a, 32-b: check valve 33-a, 33-b: flow control valve

34-a, 34-b: flow meter 35-a, 35-b: solenoid valve

36-a, 36-b: pressure gauge 37: control unit

Hereinafter, with reference to the accompanying drawings, the technical contents of the present invention for achieving the above object will be described in detail.

Figure 3 is a cross-sectional view showing the overall configuration of the tundish cross-start device of the continuous casting plant according to the present invention, Figure 4 is an extract showing the main part in the apparatus of Figure 3, where 12 is a tundish of the continuous casting plant , 21 represents a well block, 22 represents an upper nozzle, 23 represents an upper plate, 24 represents a lower nozzle, 25 represents an immersion nozzle, and 28 represents a lower plate.

The tundish cross start apparatus of the present invention is disposed on the lower plate 28 so as to be positioned under the cross sea upper nozzle 22 of the lower plate 28 and the means for supplying argon gas to the upper nozzle 22. And a argon gas supply means for the refractory porous portion 40 of the lower plate 28 and the refractory porous portion 40 of the lower plate 28.

The means for supplying the argon gas to the upper nozzle 22 was configured by matching the existing argon gas supply pipe (26-b), by installing the tee bow 31 and the check valve (32-b) in the existing argon gas line The tundish cross start device prevents gas from flowing back into the existing line when argon gas is injected. In addition, a check valve 32-a is installed in front of the tee bow 31 to prevent the gas from flowing back into the tundish cross start device line when argon gas is injected. Moreover, the flow regulating valve 33-b was provided in order to adjust the argon gas supply amount to an appropriate amount. In addition, an argon gas flow meter 34-b is provided to allow the argon gas injection amount to be checked, and the control unit 37 automatically controls argon gas supply or cut-off at the front end of the gas flow meter 34-b. Connected solenoid valve 35-b was installed. In addition, a pressure gauge 36-b was installed to check the supply pressure of argon gas.

In the lower plate 28, a refractory porous portion 40 is provided at a portion where the molten steel from the inside of the tundish 12 is touched and the argon gas supply pipe 26-a is provided in the lower plate 28. To install the connection.

Argon gas supply means for the lower plate 28 is connected to the argon gas supply pipe 26-a via a coupling 27-a and a flexible hob 30-a. Argon gas flow control valve 33-a is coupled to the union in front of the flexible hose (30-a) to control the amount of argon gas supply. In addition, an argon gas flow meter 34-a was installed at the front end of the flow control valve 33-a to check whether argon gas of the proper flow rate was supplied. In addition, a solenoid valve 35-a connected to the control unit 37 is installed at the front end of the flow meter 34-a to control the supply and interruption of argon gas. In addition, a pressure gauge 36-a was installed at the front end of the solenoid valve 35-a to check whether or not the argon gas supply pressure was abnormal.

In operation, if the casting mode of the continuous casting equipment in which the device of the present invention is installed is selected as casting mode, tundish car casting position, ladle sliding nozzle opening, auto starting cast as usual, the tundish sliding nozzle In the cross state, argon gas is injected into the upper nozzle 22 at a flow rate of, for example, 80 l / min, and argon gas is injected into the porous portion 40 of the lower plate 28, for example, at a flow rate of 200 l / min.

When the molten steel reaches the top of the well block 21 in the state in which the argon gas is injected as described above, bubbling by the supply argon gas occurs in the molten steel to prevent solidification of the molten steel, and the inclusion floating separation occurs in this state. When the weight of the molten steel in the tundish 12 is about 20 tons, the solenoid valve 35-b of the argon gas supply line to the upper nozzle 22 and the solenoid valve of the argon gas supply line to the lower plate 28 are provided. As the 35-a crosses at the same time, the tundish sliding nozzle opens to 80 mm and is excited.

When molten steel is filled in the mold 13, the tundish sliding nozzle is opened and crosses according to the molten steel level in the mold 13. When the molten steel level reaches "0", the subsequent mode is automatically selected. All of the above operations are automatically controlled by the controller 37 in the same order as in FIG.

The present invention as described in detail above in the continuous casting facility to ensure the sufficient molten steel in the tundish (12) during the initial operation of the casting to ensure that the inclusion of the floating parts to supply to the mold (13) to improve the quality and operation It contributes greatly to the stability and can reduce the cost and productivity because it does not use the cone 20 in the tundish as in the prior art, and stabilizes the operation by ensuring sufficient preheating temperature of the tundish 12 to prevent nozzle clogging. It provides excellent effects such as being able to plan.

Claims (1)

The molten steel from the ladle 1 is received and stored in the tundish 12 and the molten steel is stored through the upper nozzle 22, the lower plate 28, the lower nozzle 24, and the immersion nozzle 25. In the continuous casting equipment for continuous casting by injecting Connect the argon gas supply line controlled by the solenoid valve 35-b to the upper nozzle 22, The refractory porous portion 40 is installed at the portion where the tungsten cross reaches the molten steel from the inside of the tundish cross of the lower plate 28 and is controlled by the solenoid valve 35-a in the porous portion 40. A tundish cross start device for continuous casting equipment characterized by the configuration of argon gas supply lines connected to each other.