JPH0539755U - Gas blowing structure of molten metal flow controller - Google Patents

Abstract

(57) [Summary] (Correction) [Configuration] The gas blowing member 1 and the molten metal blocking portion 5 are provided on both sides of the molten metal discharge hole 3 in the sliding direction, and the gap between the center of the discharge hole and the center of the gas blow member is provided. The interval S1 is 1.1 of the discharge hole diameter D.
It is a gas blowing structure that is less than double, and by arranging a gas blowing member in the immediate vicinity of the molten steel discharge hole, the low temperature area of the slide plate is eliminated, and the flow hole of the slide plate and the flow hole of the bottom plate communicate with each other. However, the structure in which the inert gas is blown into the molten steel in the discharge hole of the bottom plate is configured to prevent the formation of the solidified film of the molten steel. [Effect] Since the gas blowing part and the molten metal blocking part are different and the molten metal does not enter the gas blowing member after the casting is completed, the slide plate can be reused. Since the distance between the molten metal discharge hole and the gas blowing member can be set short, it is possible to prevent the temperature drop of the gas blowing member and the slide plate surface by heat conduction, and to prevent the molten metal solidification in the nozzle more reliably. Become.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a gas blowing structure of a slide valve device which is attached to a molten metal container such as a ladle and a tundish and used to discharge molten metal.

[0002]

[Prior Art]

 As a method for preventing the solidification of molten steel in the molten metal flow rate control device: A method in which a gas blowing member is installed at the stroke end of the molten steel blocking section of the slide plate to prevent the solidification of molten steel by blowing an inert gas, and the molten steel of the bottom plate A method is known in which a gas blowing member is provided on the inner surface of the flow hole to blow an inert gas to prevent the molten steel from solidifying.

[0003]

[Problems to be solved by the device]

 In the above method, when the slide plate moves from the gas blowing position at the stroke end to the opening injection position, the molten steel in contact with the upper surface of the slide plate, which has a low temperature, becomes a thin skin-like solidified film, and the opening injection position (each plate In some cases, the injection may not be started even if the molten steel flow holes in (1) are connected.

In the above method, since the gas blown from the gas blowing member cannot sufficiently stir the molten steel in the vicinity of the surface in contact with the slide plate, the molten steel in contact with the upper surface of the slide plate is solidified and the opening injection position is set. However, it may not be possible to start the injection of molten steel.

In order to solve the problems of these known techniques, the applicants of the present invention have previously developed “molten steel metal flow rate control device and molten metal discharge stopping method” (Japanese Patent Laid-Open No. 3-155454).

[0006]

[Means for Solving the Problems]

 The present inventors have succeeded in developing the present invention as a result of various studies and experiments in order to solve the above-mentioned problems of the conventional method, and the technical configuration of the present invention has a gas blowing slide plate. In the molten metal flow rate control device, a gas blowing member and a molten metal blocking portion are provided on both sides in the sliding direction of the molten metal discharge hole, and the distance S1 between the center of the discharge hole and the center of the gas blow member is the discharge hole diameter D. It is a gas blowing structure of a molten metal flow rate control device characterized by being less than 1.1 of the above. By improving the structure of the molten metal flow rate control device previously proposed by the present applicants, molten steel By disposing a gas blowing member in the immediate vicinity of the discharge hole, the low temperature region of the slide plate is eliminated, and even if the flow hole of the slide plate and the flow hole of the bottom plate are in communication, the molten steel inside the discharge hole of the bottom plate The active gas as blowing Mel configuration, in which a structure capable of preventing the formation of molten steel solidification film.

FIG. 1 is a vertical sectional view of an example of a slide plate having a gas blowing structure of the present invention, and FIG. 2 is a plan view thereof.

In the figure, (1) is a breathable refractory material, which is arranged so as to fit on the upper surface of a plate brick (10), and a gas supply pipe (2) is provided on the lower surface of the breathable refractory material. Communication (not shown). (3) is a molten metal discharge hole having a diameter D, and the distance S1 between the center of the discharge hole (3) and the center of the gas blowing member (1) is less than 1.1 of the diameter of the discharge hole (3). In the figure, (5) is a molten metal blocking part.

FIG. 3 shows an example of a structure in which the upper surface of a slide plate brick has a plurality of pores (4), and these pores (4) communicate with a gas supply pipe (2) through a gas pool (5). FIG.

A usage mode of the gas blowing structure according to the present invention will be described with reference to FIGS.

FIG. 4A is a schematic vertical cross-sectional view showing a gas blowing process at the time of injecting (or storing) molten steel into a molten steel container, in which the gas blowing member 1 of the slide plate (10) is connected to the molten steel of the bottom plate (11). The gas is blown into the molten steel by the gas blowing member (1) so as to prevent solidification of the molten steel.

FIG. 4B is a schematic vertical cross-sectional view showing a state at the start of discharging molten steel. Since the molten steel discharging hole (3) and the gas blowing member (1) are provided close to each other, a slight sliding of the slide plate is performed. Due to the movement, a part of the molten steel discharge hole (3) of the slide plate and a part of the gas blowing member (1) are engaged with the discharge hole of the bottom plate (11), so that the discharge of molten steel partially starts. Even if it is done, gas is blown into the molten steel, the center interval S1 between the two is short, and the refractory in this interval has a high temperature due to the heat of the molten steel, so that the molten steel is not cooled. Together with the gas blowing described above, the solidification of molten steel can be prevented.

FIG. 4C is a schematic vertical cross-sectional view showing a state of discharging (injecting) molten steel, in particular, “throttle injection”. After completion of the injecting, the slide plate (10) is slid to slide the slide plate (10). The molten steel shut-off part (5) is positioned immediately below the discharge hole of the bottom plate (11), and after cleaning the slag inside the molten steel container, new molten steel is received in the container. In this case, the gas can be blown in as shown in FIG. 4A.

[0014]

[Effect of the device]

 (1) Since the gas blowing part and the molten metal blocking part are different and the molten metal does not enter the gas blowing member after the casting is completed, the slide plate can be reused.

(2) Since the distance between the molten metal discharge hole and the gas blowing member can be set to be short, it is possible to prevent the temperature of the gas blowing member and the slide plate surface from decreasing due to heat conduction, and to prevent molten metal solidification in the nozzle. It will be more certain to prevent.

(3) Since the gas blowing position and the injection position are close to each other, the sliding stroke and time are shortened.

(4) The structure is such that gas can be supplied into the molten steel discharge hole even while the molten steel is being discharged.

(5) Since the molten metal blocking portion is used only after the pouring, the melt loss on the surface of the slide plate is small and the molten metal can be stopped surely.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an example of the gas blowing structure of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a longitudinal sectional view showing another example of the gas blowing structure of the present invention.

FIG. 4 is a schematic vertical sectional view showing a mode of use of the gas blowing structure of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas blowing member 2 Gas supply pipe 3 Molten metal discharge hole 4 Gas blowing member (pore type) 5 Molten metal blocking section 10 Slide plate 11 Bottom plate

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[Procedure amendment]

[Submission date] December 12, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

[Figure 3]

Claims (2)

[Scope of utility model registration request] 1. A molten metal flow rate control device having a gas blowing slide plate, wherein a gas blowing member (1) and a molten metal blocking portion (5) are provided on both sides of a molten metal discharge hole (3) in the sliding direction, A gas blowing structure for a molten metal flow rate control device, wherein a distance S1 between the center of the discharge hole and the center of the gas blowing member is less than 1.1 of the diameter D of the discharge hole. 2. The gas blowing member is a gas permeable member fitted to the upper surface of the slide plate, or comprises a plurality of pores opened on the upper surface of the slide plate.
A gas blowing structure for the molten metal flow control device described.