JPH09323162A - Ladle for molten metal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the reseability and use frequency of a gas blowing plug by restraining the penetration of molten metal into the gas blowing plug at the time of shifting a ladle. SOLUTION: The ladle has a circuit constituted of a gas cylinder 3 for pressure accumulation, an air operated valve 8 for executing the pressure accumulation therein, a non-return valve (inlet side of the cylinder) 5 for preventing back flow of the gas and a shuttle valve 7 for changing over the flow passage by the gas pressure difference to prevent the penetration of the metal into the gas blowing plug 2 at the time of shifting the ladle. By this constitution, the gas cylinder 3 and the special circuit for gas pressure accumulation in the gas cylinder 3 are used and the gas accumulated in the gas cylinder 3 is supplied into the gas blowing plug 2 even at the time of shifting the ladle, and the penetration of the metal into the gas blowing plug 2 and be restrained. Therefore, the reuseability and the use frequency of the gas blowing plug can be increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas blowing plug which is buried in the bottom of a ladle for molten metal and used for blowing gas into the molten metal in the ladle, and does not blow gas when moving the ladle. At times, the present invention relates to a storage gas cylinder for preventing penetration of molten metal into a gas blowing plug and a ladle for molten metal formed by separately providing a special circuit for performing storage pressure.

[0002]

2. Description of the Related Art Conventionally, a gas blowing plug 2 which is buried in the bottom of a ladle 1 for molten metal and blows gas onto the molten metal in the ladle 2.
When the ladle is moved after the gas blowing process, the gas pipe is disconnected and the molten metal moves inside the gas blowing plug 2 during the movement, and even if the molten metal is tried to be used again, It was often impossible to use because it was blocked. Therefore, a technique has been devised in which, as shown in FIG. 1, the pressure is stored in the gas cylinder 3 when the gas is blown, and the molten metal is suppressed from entering the plug by the gas stored in the gas cylinder 3 when the gas is moved. (Utility model application, Sho 64-15656) However, even when this technique is used, the storage pressure in the gas cylinder 3 is not exerted, the effect is not so great, and the penetration of the molten metal has not been suppressed.

In a conventional ladle for molten metal 1 equipped with a gas cylinder 3, a high-pressure gas normally passes through the cylinder during gas blowing, and the molten metal does not enter the gas blowing plug 2, but moves. At times, when the high-pressure gas is disconnected, the gas stored in the cylinder is moved to the place where the gas is stored only to the same level as the pressure at the bottom of the ladle due to the molten metal in the ladle. Since the gas in the gas blowing plug 2 flows upward due to the difference in specific gravity, the effect of suppressing the permeation of the molten metal is weakened with time, and finally the molten metal permeates into the gas blowing plug 2. It is thought to go. For this reason, there has been a need for a technique that enables the storage pressure in the gas cylinder 3 to be higher than the pressure due to the molten metal in the ladle.

[0004]

SUMMARY OF THE INVENTION In the method of FIG. 1 described above,
Since the storage pressure exceeding the pressure generated by the specific gravity of the molten metal in the ladle cannot be performed in the gas cylinder 3, the permeation of the molten metal into the gas blowing plug 2 cannot be sufficiently suppressed when the ladle is moved, and the gas blowing plug 2 It was difficult to reuse the gas blowing plug 2 because the flow rate of the gas blowing plug was reduced and finally closed.

Molten metal gas blowing plug 2 when moving the ladle
In order to suppress the infiltration into the inside, if the storage pressure exceeding the pressure generated by the specific gravity of the molten metal in the ladle can be performed in the gas cylinder 3 and the gas can be blown little by little even when moving, It is possible to suppress the permeation of the molten metal into the gas blowing plug 2 when the ladle is moved.

The present invention has been made in order to meet the above-mentioned demands, and enables a storage pressure exceeding the pressure generated by the specific gravity of the molten metal in the ladle to be generated in the gas cylinder 3, and a small amount even during movement. By allowing the gas to blow one by one, it is intended to suppress the permeation of the molten metal into the gas blowing plug 2 when the ladle is moved, and thereby to reuse the gas blowing plug 2 and improve the number of times of use.

[0007]

According to the present invention, in the initial stage of gas blowing according to the method of FIG. 2, forcibly pressure is applied to the inside of the gas cylinder 3, and after the end of the pressure, the valve is switched and the normal gas is blown. I do. When the ladle is moved after the gas is blown, the gas stored in the tank is filled with the gas blow plug 2
And has a function of suppressing the permeation of the molten metal into the gas blowing plug 2. (Operation) Gas is supplied from the gas supply source connected to the pipe connecting portion 10 of FIG. At this time, the shuttle valve 7 is the gas cylinder 3
Since the supply pressure from V is higher than the pressure in the gas blowing pipe 11, the circuit is such that the gas from the gas cylinder 3 is supplied to the gas blowing plug 2. Next, the pressure in the gas cylinder 3 is supplied to the pilot section of the air operated 3 port valve 8 through the pilot pipe 9, and when the valve switching pressure is reached, the air operated 3 port valve 8 switches and the gas blowing pipe 11 Gas is supplied to the gas cylinder 3 and the shuttle valve 7 is connected to the gas cylinder 3
Since the pressure of the gas blowing pipe 11 is higher than the pressure on the side, the circuit on the side of the gas cylinder 3 is closed, the circuit of the gas blowing pipe 11 and the pipe 6 is opened, and the gas cylinder 3 is in a pressure-stored state. To blow gas. After the gas is blown, when the gas supply source connected to the pipe connecting portion 10 is disconnected and the gas supply is stopped, the pressure in the gas cylinder 3 becomes higher than the pressure in the gas blowing pipe 11, so that the shuttle valve is used. 7 is switched, the circuit from the gas cylinder 3 to the pipe 6 is opened, and the circuit from the gas blowing pipe 11 to the pipe 6 is closed. Thereby, the gas stored in the gas cylinder 3 is throttled to a specified flow rate through the on-off valve (also serving as a throttle valve) 4 and supplied to the gas blowing plug 2.

[0008]

[Embodiment] The operation of the circuit described in the above section (action) in actual use will be described. Pipe connection part 1 in FIG.
Gas is supplied by a gas supply source (original pressure 7 kg / cm ² ) connected to 0, and the gas pressure is first stored in the gas cylinder 3.
Next, when the pressure of about ½ of the supply pressure is stored in the gas cylinder 3, the pressure is supplied to the pilot portion of the air operated 3 port valve 8 through the pilot pipe 9, and the valve is switched to the gas blowing pipe. The circuit of 11 and the pipe 6 is opened, and the gas blowing operation is performed in a state where the pressure is stored in the gas cylinder 3. After the gas is blown, the gas supply source connected to the pipe connection part 10 is disconnected, and when the gas supply is stopped, the gas pressure stored in the gas cylinder 3 causes the on-off valve (also serving as a throttle valve).
It is supplied to the gas blowing plug 2 after being throttled to a specified flow rate through 4, and the gas is blown even during movement.

[0009]

As described above, according to the present invention, in the ladle for molten metal, by using the gas cylinder and the special circuit for accumulating the gas, the gas compressed by the gas cylinder is blown even when the gas is moving. It has become possible to suppress the penetration of molten metal into the gas-blowing plug by supplying it to the plug. Therefore, the gas blowing plug can be reused and the number of times of use can be improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a conventional ladle for molten metal.

FIG. 2 is a vertical sectional side view showing an embodiment of the present invention.

[Explanation of symbols]

 1 Ladle for molten metal 2 Gas blow plug 3 Gas cylinder 4 Open / close valve (also used as throttle valve) 5 Check valve (gas cylinder inlet side) 6 Piping 7 Shuttle valve 8 Air operated 3 port valve 9 Pilot piping 10 Piping connection 11 Gas Blowing pipe

Claims (1)

[Claims] 1. A ladle for molten metal having a gas blowing plug for blowing the stirring gas to the bottom of a lathe for molten metal in order to prevent penetration of metal into the gas blowing plug 2 when the ladle is moved. A gas cylinder 3 and an air-operated valve 8 for performing storage pressure to the gas cylinder 3, a check valve (cylinder inlet side) 5 for preventing backflow of gas, and a shuttle valve 7 for switching a flow path depending on a pressure difference of gas are provided. Ladle for molten metal characterized by.