JP7346780B2 - gas blowing device - Google Patents

Description

The present invention relates to a gas blowing device.

Conventionally, molten metal (molten metal, for example, molten steel) is stored and handled in a storage container. For example, in a continuous casting machine, molten steel is poured from an outlet into a storage container (for example, a ladle), the stored molten steel is discharged into a tundish, and the molten steel is poured from the tundish into a mold. After discharging the stored molten steel into the tundish, the ladle is transported to a predetermined position (original position), and molten steel is poured into the ladle again. Then, the stored and accommodated molten steel is processed, transported, and discharged. In a continuous casting machine, these steps are repeated.

The ladle is provided with a gas blowing plug (hereinafter also referred to as a blowing plug) that blows gas (stirring gas) into the stored or accommodated molten steel. The blowing plug is installed at the bottom of the tank-like ladle and blows stirring gas such as argon or nitrogen into the molten steel. By blowing the stirring gas, processes such as stirring the molten steel, adjusting the temperature, and promoting the reaction for removing nonmetallic components proceed.

Blow-in plugs include, for example, porous plugs that have porous shaped refractories with continuous pores, and slit plugs that have slits (slit-like through holes) formed in non-porous (dense) shaped refractories. I can give it to you. The blowing plug blows into the molten steel stirring gas that has passed through the continuous pores of the porous plug or the slit-like through holes of the slit plug.

While the ladle is storing molten steel and stirring gas is not being blown into the molten steel, molten steel may enter the through hole (or pore) of the blow plug (also called insertion). . When insertion occurs, the inserted molten steel solidifies within the through hole, making it difficult for stirring gas to pass through the through hole. In other words, the amount of stirring gas blown out decreases, and the molten steel cannot be sufficiently stirred or treated. To solve this problem, a process to remove the inserted molten steel (cleaning of the blow plug) is being carried out. The ladle after cleaning the blow plug is reused.

As described in Patent Document 1, cleaning of the blow plug is performed by blowing oxygen gas onto the inner surface of the blow plug from the inner peripheral surface side of a ladle while blowing out cleaning gas from the pores of the blow plug. The cleaning gas is a non-reactive gas such as Ar gas or _N2 gas. This cleaning of the blow plug is also referred to as oxygen cleaning.
During oxygen cleaning, the ladle is transported to a predetermined position where oxygen cleaning is performed, and a blow plug is connected to a cleaning gas supply source that supplies cleaning gas, making it possible to blow out cleaning gas from the blow plug.

Oxygen cleaning is performed by spraying oxygen gas until the cleaning gas can be blown out from the blow plug at a predetermined flow rate. In other words, when the flow rate of the cleaning gas blown out from the blow plug reaches a predetermined flow rate, oxygen cleaning of the blow plug ends.

The ladle may be provided with multiple blow plugs. In a ladle provided with a plurality of blow plugs, each blow plug is provided with a supply path for cleaning gas to be blown into the molten steel. In this ladle, oxygen cleaning (oxygen spraying) is performed for each blow plug. Specifically, oxygen gas is sprayed while supplying cleaning gas to the first blow plug (first blow plug) to perform oxygen cleaning of the first blow plug. When oxygen cleaning of the first blow plug is completed, the first blow plug is disconnected from the cleaning gas supply source, and the next blow plug (second blow plug) is connected to the cleaning gas supply source. Then, while supplying cleaning gas to the second blow plug, oxygen gas is sprayed to perform oxygen cleaning. In this way, when cleaning a plurality of blow plugs, each time the blow plug that sprays oxygen gas changes, the blow plug and the cleaning gas supply source are connected and disconnected. Cleaning multiple blow plugs requires additional time and effort to connect and disconnect the blow plugs from the cleaning gas supply source.

In a ladle equipped with multiple blow plugs, this connection and disconnection is performed manually by an operator. The area around the ladle is at a high temperature due to the heat of the ladle itself and the molten metal remaining inside the ladle (especially radiant heat from the ladle side). Therefore, as the number of connections and disconnections increases, there is a problem in that the number of times and time that workers are exposed to high heat increases. In other words, there was a problem that the safety of workers was reduced.

Patent No. 5516393

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a gas blowing device that is equipped with a storage container having a plurality of blow plugs and can clean the blow plugs smoothly and safely. .

A gas blowing device of the present invention that solves the above problems includes a first blowing plug that blows gas into the molten metal, which is provided at the bottom of a storage container that stores molten metal, and a first blowing plug that blows gas into the molten metal. a second blowing plug for blowing gas into the molten metal, which is provided at a position spaced apart from the plug; and a gas receiving port for receiving the gas; a gas supply circuit that supplies gas to a second blow plug, the gas blowing device blowing out a predetermined gas from each of the blow plugs when cleaning each of the blow plugs, the gas supply circuit comprising: a first gas flow path through which the gas from the gas socket flows to the first blow plug; a second gas flow path through which the gas from the gas socket flows to the second blow plug; and a second gas flow path downstream of the gas socket. a switching device that is provided and switches the flow of the gas between the first gas flow path and the second gas flow path; and a switching device that is provided in the first gas flow path and switches the gas flow through the first gas flow path; a first gas flow meter that measures the flow rate of the gas, a second gas flow meter that is provided in the second gas flow path and that measures the flow rate of the gas flowing through the second gas flow path, and the first gas flow meter and the second gas flow meter is connected, and when the flow rate of the gas flowing through the first gas flow path or the second gas flow path becomes equal to or higher than a predetermined flow rate, the switching device is operated to control the flow of the gas. It is characterized by having a control device that switches the flow and operates a notification device to notify the outside of the switching.

The gas blowing device of the present invention can switch the flow of gas from the gas socket using the switching device to flow the gas into the first blowing plug (first gas flow path) or the second blowing plug (second gas flow path). According to this configuration, the gas blown by the plurality of blow plugs can be supplied from one gas socket, and the number of connection points with the gas source can be reduced to one. It is possible to reduce the number of times and time an operator has to approach the storage container when switching connections. In other words, the blow plug can be cleaned safely.

The gas blowing device of the present invention is preferably operated when cleaning the first blowing plug and the second blowing plug. According to this configuration, the number of connections between each blow plug and the gas source can be reduced for cleaning the blow plugs. In other words, the operator can clean the blow plug more safely.

1 is a schematic diagram showing the configuration of a ladle of Embodiment 1. FIG. 1 is a schematic diagram showing the configuration of a gas supply circuit for a ladle in Embodiment 1. FIG. 1 is a schematic diagram showing the configuration of a continuous casting machine using a ladle of Embodiment 1. FIG. FIG. 3 is a schematic diagram showing oxygen cleaning of the ladle of Embodiment 1.

Hereinafter, the present invention will be specifically described using embodiments. The embodiment is an example in which the gas blowing device of the present invention is applied to a ladle for processing molten steel. Molten steel corresponds to molten metal. The following embodiments are examples of specific embodiments for carrying out the present invention, and the present invention is not limited to the following embodiments. Further, the structure of each form may be appropriately combined.

[Embodiment 1]
(Ladle)
The ladle 1 of this embodiment includes a ladle body 2, a blow plug 3, a cleaning gas supply circuit 4, and a cleaning gas supply device 5, as shown in FIGS. 1 to 3. FIG. 1 schematically shows the configuration of the ladle 1. FIG. 2 schematically shows the configuration of the cleaning gas supply circuit 4. As shown in FIG. FIG. 3 schematically shows the configuration of a continuous casting machine 6 using the ladle 1.

(Ladle body)
The ladle main body 2 corresponds to a storage container, and is a tank-shaped container that stores molten steel (corresponding to molten metal). The ladle body 2 is provided with a blow plug 3 at the bottom of the container. The ladle body 2 is provided with a nozzle 21 at the bottom of the container for discharging the stored molten steel. The nozzle 21 has a molten steel outlet hole for discharging the stored molten steel. The structure of the ladle main body 2 is not limited, and a conventional one can be used. The ladle main body 2 of this embodiment includes a tank-shaped iron shell and a refractory disposed on the inner peripheral side of the iron shell.

(Blow plug)
The blow plug 3 includes a first blow plug 31 and a second blow plug 32. The first blow plug 31 is a member provided at the bottom of the ladle body 2 that blows gas (cleaning gas and stirring gas) into molten steel (molten metal). The second blow plug 32 is a member provided at the bottom of the ladle main body 2 at a position spaced apart from the first blow plug 31 and blows gas into molten steel (molten metal). The blow plugs 3 (the first blow plug 31 and the second blow plug 32) are embedded in the refractory on the inner circumferential side of the ladle main body 2.
The configuration of the blow plugs 3 (first blow plug 31 and second blow plug 32) is not limited, and conventional ones can be used. Examples of the blow plug 3 include porous plugs and slit plugs.

(Cleaning gas supply circuit)
The cleaning gas supply circuit 4 has a gas receiving port 41 that receives the cleaning gas from the cleaning gas supplying device 5, and receives the cleaning gas from the gas receiving port 41 and supplies the first blowing plug 31 and the second blowing plug 32. supply cleaning gas. The cleaning gas supply circuit 4 has a pipe line that forms a flow path for cleaning gas.

The cleaning gas supply circuit 4 includes a valve 42 , a first gas flow path 43 , a first gas flow meter 44 , a second gas flow path 45 , a second gas flow meter 46 , a control device 47 , and a notification device 48 . Further, the cleaning gas supply circuit 4 is provided with a pressure regulating valve V and a gas pressure gauge P.
The cleaning gas supply circuit 4 has a valve 42 downstream of the gas receiving port 41 .
The gas socket 41 forms a connection between the ladle 1 and the cleaning gas supply device 5 of this embodiment.

The valve 42 corresponds to a gas switching means and switches the flow of gas so that the gas from the gas receiving port 41 flows into the first gas flow path 43 or the second gas flow path 45. The valve 42 is not limited as long as it is a member or device that can switch the gas flow paths 43, 45 so that the cleaning gas flows into either one of the gas flow paths 43, 45. In this embodiment, a solenoid valve is used for the valve 42 so that the cleaning gas flows only into one of the first gas flow path 43 and the second gas flow path 45.
The first gas passage 43 is connected to the first blow plug 31 and is formed so that gas from the gas receiving port 41 flows to the first blow plug 31 . A first gas flow meter 44 is provided in the first gas flow path 43 .
The second gas passage 45 is connected to the second blow plug 32 and is formed so that gas from the gas receiving port 41 flows to the second blow plug 32 . A second gas flow meter 46 is provided in the second gas flow path 45 .
The first gas flowmeter 44 and the second gas flowmeter 46 are not limited as long as they can measure the flow rate of gas flowing through each gas flow path 43, 45, and in this embodiment, the gas flowmeter used in a conventional ladle is used. A meter is used.

The control device 47 is connected to a valve 42, a first gas flow meter 44, a second gas flow meter 46, and a notification device 48.
The connection between the control device 47 and each of the valve 42, the first gas flow meter 44, the second gas flow meter 46, and the notification device 48 is not limited as long as it is possible to transmit and receive necessary signals (information). Connection methods include a wired connection for transmitting and receiving electrical signals, a mechanical connection (physical connection) using an actuator, etc., and a wireless connection using electromagnetic waves.

The control device 47 receives the measurement results of the gas flowmeters 44 and 46, and controls the flow rate of the gas flowing through the gas flow path selected by the valve 42 among the gas flow paths 43 and 45, and the preset gas flow rate. (predetermined flow rate). Then, when the gas flow rate becomes equal to or higher than a predetermined flow rate, it is determined that oxygen cleaning is completed.
When the control device 47 determines that oxygen cleaning has ended, it operates the valve 42 to switch the flow of the cleaning gas.

When the control device 47 determines that the oxygen cleaning has ended, it activates the notification device 48 to notify the outside (particularly the oxygen cleaning operator) of the switching of the gas flow. The control device 47 operates the notification device 48, that is, performs notification to the outside for a predetermined period of time. The notification device 48 stops operating after a predetermined period of time has elapsed. The control device 47 of this embodiment controls the operation and stop of the notification device 48 (on and off control).

Note that the notification device 48 may include a timer. The timer stops the operation of the notification device 48 after a predetermined time has elapsed (off-only control). In this configuration, the control device 47 can only control the operation of the notification device 48 (on-only control).

The notification device 48 is not limited as long as it is a device that can notify the outside (in particular, workers around the ladle 1) of the switching of the gas flow. In this embodiment, a buzzer 481 and a light 482 are used. Note that the buzzer 481 indicates a means for audibly informing the outside using an audible sound (sound), and includes a speaker, a bell, and the like. The light 482 indicates a means for visually informing the outside using visible light, and includes a device that flashes and emits light, such as a revolving light or a flash light, and a display that displays information such as characters and symbols.
In the notification device 48 of this embodiment, when the control device 47 determines that oxygen cleaning has ended, it sounds the buzzer 481 and turns on the light 482 for a predetermined period of time.
The pressure regulating valve V is provided in the first gas flow path 43 and the second gas flow path 45, and adjusts the pressure of the cleaning gas flowing through each flow path 43, 45.

The gas pressure gauges P are provided in the first gas flow path 43 and the second gas flow path 45, and measure the pressure of the cleaning gas flowing through each flow path 43, 45. The pressure regulating valve V regulates the pressure of the cleaning gas based on the measurement result of the gas pressure gauge P. The measurement result of the gas pressure gauge P may be transmitted to the control device 47, and the transmitted gas pressure measurement result may be used to determine whether to switch the gas flow.

(Cleaning gas supply device)
The cleaning gas supply device 5 is connected to the gas socket 41 and supplies gas (cleaning gas) to the gas socket 41 . The configuration of the cleaning gas supply device 5 is not limited as long as it can supply cleaning gas to the gas receiving port 41. The cleaning gas supply device 5 includes, for example, a gas cylinder that stores the cleaning gas, a pipe that connects the gas cylinder and the gas receiving port 41 and through which the cleaning gas flows, and a control valve that is installed in the pipe and controls the flow rate of the gas. , can be mentioned.
The cleaning gas supplied by the cleaning gas supply device 5 is not limited to a gas used in conventional oxygen cleaning. Examples of the cleaning gas include non-reactive gases such as Ar gas and _N2 gas.

[Operations and effects]
(Motion of ladle)
The ladle 1 of this embodiment is used in a continuous casting machine 6. The continuous casting machine 6 has a ladle 1, a tundish 61, and a mold 62, as shown in FIG.
The continuous casting machine 6 pours molten steel into the ladle 1 (ladle body 2) from an outlet (not shown). The ladle 1 (ladle body 2) stores poured molten steel. At this time, the blowing plug 3 is connected to a stirring gas supply device (not shown) that supplies stirring gas. In this embodiment, the blow plug 3 and the stirring gas supply device are connected via a pipe (duct line, route) different from that of the cleaning gas supply circuit 4.
When the ladle 1 stores molten steel, the ladle 1 blows out stirring gas from the stirring gas supply device through the blowing plug 3. By blowing out this stirring gas, processes such as stirring the molten steel, adjusting the temperature, and promoting the reaction for removing nonmetallic components are performed.

When the process such as stirring the molten steel is completed, the supply of stirring gas to the blow plug 3 is stopped, and the connection between the blow plug 3 and the stirring gas supply device is disconnected. Thereafter, the ladle 1 is transported to a predetermined position above the tundish 61 (for example, the position shown in FIG. 3). The molten steel is then discharged into the tundish 61 through the nozzle 21. The molten steel discharged into the tundish 61 is poured into a mold 62 and continuously cast (molded). The ladle 1 is transported to a predetermined position (an original position where molten steel can be poured from the outlet), and molten steel is poured into the ladle 1 again. Then, in the continuous casting machine 6, the steps of storing molten steel, processing molten steel, transporting, and discharging the molten steel are repeatedly performed.

When the molten steel is treated, the molten steel enters and solidifies into the through hole (or pore) of the blow plug 3, making it difficult for stirring gas to pass through the through hole. To solve this problem, in the ladle 1, the blow plug 3 is cleaned with oxygen every time the discharge of molten steel is finished.

(Oxygen cleaning)
In oxygen cleaning, first, molten steel is discharged from the ladle body 2 of the ladle 1, so that the ladle 1 (ladle body 2) does not store molten steel. The ladle 1 is transported to a predetermined position (a working position where oxygen cleaning is performed). The ladle body 2 of the ladle 1 is tilted sideways so that the hearth bottom of the ladle body 2 faces an operator (an operator performing oxygen cleaning). At this time, the blow plug 3 and the cleaning gas supply circuit 4 are connected, and the gas socket 41 of the cleaning gas supply circuit 4 and the cleaning gas supply device 5 are also connected.

The cleaning gas supply device 5 is operated to supply cleaning gas to the gas receiving port 41. At this time, the control device 47 of the cleaning gas supply circuit 4 sets the valve 42 so that the cleaning gas from the gas receiving port 41 flows into the first gas flow path 43. Then, the cleaning gas from the cleaning gas supply device 5 is supplied to the gas receiving port 41 . The cleaning gas flows into the first blow plug 31 through the gas socket 41, the valve 42, and the first gas passage 43, and is blown out from the first blow plug 31.

The operator sprays oxygen gas onto the first blow plug 31 from which cleaning gas is being blown. For example, as shown in FIG. 4, the oxygen gas is sprayed by a worker who is located away from the opening of the ladle main body 2 that has been laid down, using a long pipe-shaped cleaning lance 63 to spray the first oxygen gas. Oxygen gas is sprayed onto the plug 31. When oxygen gas is blown, the molten steel that has entered the through hole of the first blow plug 31 reacts with the oxygen gas, generates heat, and melts. The first blow plug 31 is supplied with cleaning gas from the gas socket 41, and along with the flow of the cleaning gas, molten steel is blown out from the first blow plug 31 and removed.

When the molten steel is removed from the first blow plug 31, the gas flow rate of the cleaning gas flowing through the first gas flow path 43 increases. The increase in gas flow rate can be measured by first gas flow meter 44 . The measurement results of the first gas flow meter 44 are input to the control device 47 . The control device 47 compares the flow rate of the cleaning gas flowing through the first gas flow path 43 with a preset flow rate (predetermined flow rate). Then, when the flow rate of the cleaning gas in the first gas flow path 43 becomes equal to or higher than a predetermined flow rate, it is determined that the oxygen cleaning of the first blow plug 31 is finished.

When the control device 47 determines that oxygen cleaning of the first blow plug 31 is finished, it operates the valve 42 and switches the flow of the cleaning gas. Then, the cleaning gas flows to the second blow plug 32 through the gas socket 41, the valve 42, and the second gas passage 45, and is blown out from the second blow plug 32.

When the control device 47 determines that the oxygen cleaning of the first blow plug 31 is completed, the control device 47 operates the buzzer 481 and the light 482 for a predetermined period of time. The operator confirms the end time of oxygen cleaning of the first blow plug 31 by the buzzer 481 and the light 482, and performs oxygen cleaning of the second blow plug 32 in the same manner as the first blow plug 31.

(effect)
The ladle 1 of this embodiment has two blow plugs 31 and 32, and a valve 42 switches the flow of cleaning gas from the gas receiving port 41 to the first blow plug 31 (first gas flow path 43) or the first blow plug 31 (first gas flow path 43). 2 blow plug 32 (second gas passage 45). That is, the cleaning gas blown out by the two blowing plugs 31 and 32 can be supplied from one gas receiving port 41. On the other hand, in the conventional one having two blow plugs 31 and 32, a gas receiving port is formed corresponding to each of the blow plugs 31 and 32, and when one blow plug 31 is finished oxygen cleaning, the other blow plug 31 is The gas socket of the plug 32 and the cleaning gas supply device 5 had been reconnected. In this way, the ladle 1 of this embodiment reduces the number of connection points between the cleaning gas supply device 5 and the cleaning gas supply circuit 4 (blow plug 3) to one, so that the cleaning gas supply device 5 and the cleaning gas supply circuit can be connected to each other. 4 (blow plug 3) can be reduced.

Further, the connection between the cleaning gas supply device 5 and the cleaning gas supply circuit 4 (blow plug 3) is made so that the ladle 1 (ladle main body 2) is connected immediately after discharging the molten steel (in a molten state where the molten steel can be cleaned with oxygen cleaning). ). During this connection, the ladle 1 (ladle body 2) is sufficiently hot, and the operator is exposed to heat (especially radiant heat) from the ladle 1 (ladle body 2). By reducing the number of connection points to one, the ladle 1 of this embodiment can shorten the time that the worker is exposed to high heat. That is, the ladle 1 of this embodiment has improved safety for workers during oxygen cleaning.

Further, in the ladle 1 of this embodiment, the end timing of oxygen cleaning is determined by measuring the gas flow rate of the cleaning gas flowing through the first gas flow path 43 with the first gas flow meter 44. Therefore, the second blow plug 32 can be cleaned with oxygen immediately after the first blow plug 31 is cleaned with oxygen. That is, the oxygen cleaning of the first blow plug 31 to the second blow plug 32 can be smoothly switched. Oxygen cleaning of the first blow plug 31 is not performed for an unnecessarily long time, and the working time required for oxygen cleaning can be shortened. Furthermore, damage to the refractory disposed on the inner circumferential surface of the ladle body 2 due to excessive heating due to excessive oxygen cleaning is suppressed.
As described above, the ladle 1 of this embodiment allows the operator to clean the blow plug 3 with oxygen smoothly and safely.

The ladle 1 of this embodiment notifies the operator of the end time of oxygen cleaning of the first blow plug 31 by operating the buzzer 481 and the light 482 for a predetermined period of time. According to this configuration, the operator can reliably recognize the end time of oxygen cleaning. As a result, the above effects can be reliably achieved.

[Embodiment 2]
This embodiment is a ladle 1 similar to Embodiment 1 except that it further includes a third blow plug (and a third gas flow path).
In the ladle 1 of this embodiment, the third blow plug and the third gas flow path are the first blow plug 31 (first gas flow path 43) and the second blow plug 32 (second gas flow path 45) of the first embodiment. ) has a similar configuration. That is, the third gas flow path is connected to the third blow plug and is formed so that the cleaning gas from the gas receiving port 41 flows to the third blow plug. A third gas flow meter is provided in the third gas flow path.

The valve 42 switches the gas flow so that the cleaning gas from the gas receiving port 41 flows into any one of the first gas flow path 43, the second gas flow path 45, and the third gas flow path.
The control device 47 receives the measurement results of each gas flow meter, and controls the flow rate of the gas flowing through the gas flow path selected by the valve 42 among the gas flow paths, and the preset gas flow rate (predetermined flow rate). Compare. Then, when the gas flow rate exceeds a predetermined flow rate, the valve 42 is operated to switch the gas flow. At the same time, the controller 47 operates the buzzer 481 and the light 482 for a predetermined period of time, and switches the flow of the cleaning gas.

(motion)
The ladle 1 of this embodiment is the same as that of the first embodiment except that the number of blow plugs 3 is increased.
The ladle 1 of this embodiment performs oxygen cleaning of the first blow plug 31 and the second blow plug 32 similarly to the first embodiment. When the oxygen cleaning of the second blow plug 32 is completed and the flow rate of the cleaning gas flowing through the second gas flow path 45 becomes equal to or higher than a predetermined flow rate, it is determined that the oxygen cleaning of the second blow plug 32 has ended. When it is determined that the oxygen cleaning of the second blow plug 32 is completed, the valve 42 is operated to switch the flow of the cleaning gas. Specifically, the valve 42 is switched so that the cleaning gas from the gas receiving port 41 flows from the second gas flow path 45 to the third gas flow path.

When the control device 47 determines that the oxygen cleaning of the second blow plug 32 is finished, it operates the buzzer 481 and the light 482 for a predetermined period of time. By the notification by the buzzer 481 and the light 482, the operator confirms the end time of oxygen cleaning of the second blow plug 32, and then cleans the third blow plug with oxygen in the same way as the first and second blow plugs 31 and 32. I do.

(effect)
The ladle 1 of this embodiment has the same configuration as the first embodiment except that the number of blow plugs 3 is increased, and exhibits the same effects as the first embodiment. That is, the ladle 1 of this embodiment can reduce the effort (work cost) required for connecting the cleaning gas supply device 5 and the cleaning gas supply circuit 4 (blow plug 3). Moreover, the ladle 1 of this embodiment has improved safety for workers during oxygen cleaning.
In particular, the ladle 1 of this embodiment has three blow plugs 3, and the number of connection points between the cleaning gas supply device 5 and the cleaning gas supply circuit 4 (blow plug 3) is reduced to one, The above effects can be more reliably achieved.
Although the second embodiment includes three blow plugs 3, the same effect can be achieved even if the number of blow plugs 3 is four or more.

[Embodiment 3]
This embodiment is the same ladle 1 as the first embodiment except that the control device 47 has a switch that allows an operator to switch the valve 42.
The ladle 1 of this embodiment exhibits the effect that the blowing plug 3 from which the cleaning gas is blown can be selected as necessary.

[Embodiment 4]
In this embodiment, the valve 42 can flow gas not only to one of the first gas flow path 43 and the second gas flow path 45 but also to both the first gas flow path 43 and the second gas flow path 45. The ladle 1 is the same as in Embodiment 1 except that a valve is used.
The valve 42 of this embodiment allows gas from the gas receiving port 41 to flow into the first gas flow path 43, the second gas flow path 45, and both gas flow paths of the first gas flow path 43 and the second gas flow path 45. You can switch as follows.

According to this embodiment, the gas supplied to the gas receiving port 41 can be selectively supplied to one or both of the two blow plugs 31 and 32. According to this embodiment, cleaning gas can be blown out from one of the first blow plug 31 and the second blow plug 32 during oxygen cleaning. If it is determined that the flow rate of the cleaning gas of one blow plug 3 (first blow plug 31) exceeds a predetermined flow rate (first predetermined flow rate), the flow rate of the cleaning gas from the other blow plug 3 (second blow plug 32) is Switch to blow out cleaning gas. After that, when it is determined that the flow rate of the cleaning gas of the other blow plug 3 (second blow plug 32) exceeds another predetermined flow rate (second predetermined flow rate), cleaning is performed from both of the two blow plugs 31 and 32. You can make the gas blow out. According to this embodiment, the two blow plugs 31 and 32 can be cleaned with oxygen at the same time, and the workability of oxygen cleaning is improved.

When the configuration of this embodiment is applied to a ladle 1 having three or more blow plugs 3 (for example, the ladle 1 of Embodiment 2), the valve 42 can be connected to any one of the three blow plugs 3. Cleaning gas can be blown out. In other words, by blowing out the cleaning gas from two blow plugs 3 (a plurality of blow plugs 3) that are close to each other, the two blow plugs 3 can be cleaned with oxygen at the same time, improving the work efficiency of oxygen cleaning. be effective. At this time, cleaning gas is not supplied to the remaining blow plugs 3 that are not cleaned with oxygen.

[Deformed form]
The ladle 1 of this embodiment includes a pressure accumulating cylinder that stores gas under pressure in a circuit that supplies stirring gas to the blow plug 3. In this embodiment, when the blow plug 3 is separated from the stirring gas supply source, gas (stirring gas stored in the tank) is supplied from this cylinder to the blow plug 3.

When moving the ladle 1 after the stirring process, the ladle 1 of this embodiment is moved after being disconnected from the stirring gas supply device. At this time, the stirring gas stored in the tank is supplied to the blower plug 3 and blown out, thereby preventing molten steel from entering the through hole of the blower plug 3 during movement. Therefore, clogging of the through hole of the blow plug 3 is suppressed, and the usage time when the ladle 1 is used repeatedly can be extended.

1: Ladle,
2: Ladle body,
3: Blow plug, 31: First blow plug, 32: Second blow plug,
4: Cleaning gas supply circuit, 41: Gas socket, 42: Valve, 43: First gas flow path, 44: First gas flow meter, 45: Second gas flow path, 46: Second gas flow meter, 47: Control device, 48: Notification device, 481: Buzzer, 482: Light,
5: Cleaning gas supply device,
6: Continuous casting machine, 61: Tundish, 62: Mold, 63: Cleaning lance.

Claims (3)

a first blowing plug for blowing gas into the molten metal, which is provided at the bottom of a storage container that stores the molten metal;
a second blowing plug for blowing gas into the molten metal, the second blowing plug being provided at the bottom of the storage container at a position spaced apart from the first blowing plug;
a gas supply circuit having a gas socket that receives the gas supply, and receives the gas supply and supplies the gas to the first blow plug or the second blow plug;
A gas blowing device that blows out a predetermined gas from each of the blowing plugs when cleaning each of the blowing plugs,
The gas supply circuit includes:
a first gas flow path through which the gas from the gas socket flows to the first blow plug;
a second gas flow path through which the gas from the gas socket flows to the second blow plug;
a switching device that is provided downstream of the gas receiving port and switches the flow of the gas between the first gas flow path and the second gas flow path;
a first gas flow meter that is provided in the first gas flow path and measures the flow rate of the gas flowing through the first gas flow path;
a second gas flow meter that is provided in the second gas flow path and measures the flow rate of the gas flowing through the second gas flow path;
The switching device is activated when the first gas flow meter and the second gas flow meter are connected and the flow rate of the gas flowing through the first gas flow path or the second gas flow path is equal to or higher than a predetermined flow rate. a control device that operates to switch the flow of the gas and operates a notification device to notify the outside of the switching;
A gas blowing device characterized by having. The gas blowing device according to claim 1, wherein the notification device includes at least one of a buzzer and a light. The gas blowing device according to claim 1, which operates when cleaning the first blowing plug and the second blowing plug.

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