JPH0618676Y2 - Ladle dust collector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a ladle dust collector.

[Prior Art] A ladle heat-up refining device is known that heats and smelts a molten metal, such as molten steel, that is discharged from a melting furnace such as an electric furnace in a ladle. In this ladle heating / refining apparatus, as shown in FIG. 4, a ladle 101 storing molten steel M and covered with a furnace lid 100 is housed inside a dust collection house 102, and an electrode device 104 is driven by a drive motor 103. The electrode rod 105 of the
5 is inserted into the electrode insertion hole 106 of the furnace lid 100, and in that state, the electrode rod 105 is energized to generate an arc, thereby raising the temperature of the molten steel M and slag floating on the molten metal M surface. The molten steel M is refined. It should be noted that the drive motor 10 is provided below the wall of the dust collecting house 102.
An air intake port 102a is formed so as to face the No. 3 unit.

In the above-described ladle heating and refining apparatus, dust is generated when the electrode rod 105 generates an arc, carbon in molten steel, alloy elements in molten steel burn, and CO gas, dust, etc.
It occurs in the inside. The dust, CO gas, and the like are discharged into the dust collection house 102 through the gap 107 between the wall surface defining the electrode insertion hole 106 and the outer peripheral surface of the electrode rod 105. Therefore, conventionally, the exhaust port 10 is provided on the wall of the dust collecting house 102.
8 was provided, the discharge port 108 was connected to the dust collector, and the dust collector was driven to suck the gas in the dust collecting house 102 from the exhaust port 108, thereby collecting the dust by the dust collector. When the dust is collected in this way, dust and CO gas in the dust collection house 102 are reduced, which is advantageous in terms of improving the precision of refining and ensuring a working environment, and suction from the air intake port 102a. Since the drive motor 103 is cooled by the outside air that is generated, it is advantageous in preventing overheating of the drive motor 103.

[Problems to be Solved by the Invention] By the way, in the above dust collecting house apparatus, although the entire ladle 101 is covered with the dust collecting house 102,
Since the air intake port 102a is formed only in the lower part of the outer wall of 02, the suction tends to be biased, and the gas flow in the dust collection house 102 becomes one-way suction, that is, the arrow shown in FIG. The direction is A. Therefore, in the conventional device shown in FIG.
In 02c, dust and hot air tend to be stagnant. for that reason,
Emission of dust, CO gas, etc. was not always sufficient.
In addition, since hot air tends to be stagnant in the portion 102c of the dust collection house 102 on the side opposite to the electric motor 103, it is disadvantageous and tends to become high temperature in order to maintain the temperature in the dust collection house 102 close to room temperature. Met. As described above, when the temperature inside the dust collection house 102 becomes high, the electric parts such as the electrode device 104 are deteriorated, or the iron plate assembling the dust collection house 102 is apt to be deformed, and the gap between the iron plates becomes large. However, dust, CO gas, etc. will leak out from the gap.

The present invention has been made in view of the above circumstances, and its purpose is not to take in air from the air intake port 102a at the lower part of the outer wall of the dust collection house 102, but to place it at the upper opening of the ladle container. By adopting a means for taking air into the dust collecting house from around the attached furnace lid, dust, C
It is an object of the present invention to provide a dust collection house apparatus having a ladle raising and refining device that solves the problems of stagnation of O gas, hot air, etc. and the problems of impairing the atmosphere inside the ladle.

[Means for Solving the Problems] The ladle dust collecting apparatus of the present invention takes in air from around the furnace lid attached to the upper opening of the ladle container. That is, the dust collecting house device of the present invention has a ladle storage chamber for storing a ladle in which molten metal is stored, and an upper surface opening communicating with the ladle storage chamber. The ladle storage container to which the inert gas is supplied in the storage chamber or the ladle, the furnace lid detachably attached to the upper opening of the ladle storage container and having the electrode insertion hole, and the electrode insertion hole are defined. An electrode device having an electrode rod that is inserted into the electrode insertion hole with a gap between the wall surface and the electrode insertion hole, a holding unit that holds the electrode rod, and a drive unit that outputs a driving force for moving the holding unit up and down, and a dust suction unit. It is composed of a dust collection house, and the dust collection house is located at the side of the ladle container.
It is composed of a house part and a second house part which is arranged above the ladle container and integrally with the first house part to form an electrode housing chamber for housing most of the electrode rods of the electrode device, and dust collection The house is characterized by having an air intake port all around the periphery of the furnace lid attached to the upper opening of the ladle container.

The first house part and the second house part may have a rectangular box shape. The first house part and the second house part can be formed of iron plates, but needless to say, may be formed of other materials such as concrete, ceramics, and lumber.

The air intake port is formed in the dust collection house, but in particular, is formed all around the peripheral portion of the furnace lid attached to the upper opening of the ladle container. The opening area of the air intake port can be appropriately set as necessary. The air intake port may have a structure in which the opening area is variable. A shutter mechanism can be used as the variable structure. The air intake port is formed continuously in a circular ring shape or a square ring shape along the outer periphery of the peripheral portion of the furnace lid.

The furnace lid may be water-cooled or non-water-cooled.

The dust suction part of the dust collection house can be an exhaust port connected to the dust collector, or can be the dust collector itself.

The dust collecting house may be formed of an iron plate, or may be formed by attaching a heat insulating material to the inner surface side of the iron plate. At least one of the first house part and the second house part of the dust collecting house can be provided with an operator entrance / exit and an opening / closing door for opening / closing the operator entrance / exit.

The electrode rod of the electrode device may be one that can heat the molten metal, a graphite electrode that generates an arc between the molten metal, or a metal electrode formed of a heating element such as nichrome immersed in the molten metal, Alternatively, it may be an electrode formed of a ceramic heating element.

[Operation] In the device of the present invention, the ladle storing the molten metal melted in the melting furnace is stored in the ladle storage container, the furnace lid is attached to the upper opening of the ladle storage container, and the ladle storage is performed. Supply an inert gas into the container or ladle. In that state, if the electrodes of the electrode device are energized to generate heat between the electrodes and the molten metal, refining is performed.

Dust, CO gas, hot air, etc. generated in the ladle are discharged into the dust collection house through the gap between the electrode insertion holes and further sucked into the dust suction portion of the dust collection house.

At this time, in the present invention, since the air intake port into the dust collection house is provided all around the periphery of the furnace lid, outside air is taken into the dust collection house from the periphery of the furnace lid.

[Embodiment] An embodiment of the present invention is shown in FIGS. 1, 2, and 3. The present embodiment is applied to the case of reducing and refining molten steel as molten metal.

(Structure of Embodiment) As shown in FIG. 1, the device of this embodiment is composed of a ladle container 1, a furnace lid 2, an electrode device 3, and a dust collection house 4.

The ladle storage container 1 is formed of a container body made of an iron plate and a heat insulating material provided on the inner surface of the container body.
Has a ladle storage chamber 6 for storing the ladle 5 stored therein, and an upper surface opening 7 communicating with the ladle storage chamber 6. A gas connecting portion 8a is provided on the side wall of the ladle container 1,
A hose 9 is detachably connected to a, and the gas connecting portion 8a is connected to an inert gas supply portion (not shown) via the hose 9.

The ladle 5 is formed of an iron plate and a refractory material on the inner surface side of the iron plate. As shown in FIG. 2, at the bottom of the ladle 5,
Porous bricks 5b through which gas passes but molten steel M does not pass are provided.

The furnace lid 2 has a substantially "bowl" shape. The furnace lid 2 can be raised and lowered by a cylinder device (not shown), and can be attached to the upper opening 7 of the ladle container 1 by lowering it. In order to secure the sealing property between the furnace lid 2 and the ladle container 1, the furnace lid 2
A heat-resistant rubber seal member 10 is interposed between the upper opening 7 and the ladle container 1. Three electrode insertion holes 11 are formed in the furnace lid 2 at predetermined intervals (only one electrode insertion hole 11 is shown in FIGS. 1 and 2).

As shown in FIG. 1, the electrode device 3 includes the electrode insertion holes 11
A total of three electrode rods 12 made of graphite that are inserted into the holder, a holding portion 13 that holds the electrode rod 12, a guide portion 14 that guides the holding portion 13, and a driving force that moves the holding portion 13 up and down. It has a drive motor 15 as a drive unit for outputting. The drive motor 15 is provided with a speed reduction mechanism 15a. Here, when the drive motor 15 is rotationally driven in one direction, the holding portion 13 descends, and the electrode rod 12 moves to the electrode insertion hole 11
Inserted in. In the inserted state, a gap 16 is formed between the wall surface defining the electrode insertion hole 11 and the electrode rod 12.

The dust collection house 4 is disposed on the floor surface 17 and the first house unit 1
8 and a second house part 19 that is integrally connected to the first house part 18. In the sectional view shown in FIG.
The dust collection house 4 has an inverted L shape.

As shown in FIG. 1, the first house portion 18 is arranged laterally of the ladle storage container 1 and has a first partition wall 20 made of an iron plate and a first outer wall 21 made of an iron plate. Then, the first partition wall 20 and the first outer wall 21 form a motor housing chamber 22 that houses the drive motor 15. Here, the first partition wall 20 is interposed between the drive motor 15 and the ladle storage container 1. The first outer wall 21 defines the outer shape of the first house portion 18, and is arranged at a predetermined distance from the first partition wall 20.

The second house portion 19 is disposed above the ladle container 1, and when the electrode rod 12 of the electrode device 3 is raised, the electrode rod 1
The electrode storage chamber 23 that stores all or most of the two is formed. The second house part 19 includes a second partition wall 25 made of an iron plate located immediately above the ladle storage container 1 and a ceiling wall 2 made of the iron plate.
6 and a second outer wall 27 made of an iron plate.

In the present embodiment, the furnace partition 2 is integrally formed with the second partition wall 25.

Now, in the present embodiment, as shown in FIG.
An air intake port 30 is formed between the peripheral edge portion 25a of the second partition wall 25 and the first partition wall 20, and the peripheral edge portion 25a of the second partition wall 25 is formed.
An air intake 30 is also formed between the second outer wall 27 and the second outer wall 27. Therefore, the air intake port 30 is formed continuously around the periphery of the furnace lid 2, that is, around the furnace lid 2.

An exhaust port 31 as a dust suction part is formed in the second house part 19. The exhaust port 31 is located above the electrode rod 12, and is connected to a suction unit of a dust collector (not shown) via a duct.

On the second outer wall 27 of the second house portion 19 of the dust collection house 4,
A worker entrance / exit 32 is formed, and an opening / closing door 33 for opening / closing the worker entrance / exit 32 is provided. Further, an opening 34 is formed in the ceiling wall 26, and the opening / closing door 3 that opens and closes the opening 34.
5 are provided.

(Operation of Example) In the present example, 1450 to that melted in a melting furnace such as an electric furnace
The molten steel M having a high temperature of about 1500 ° C. is stored in the ladle 5.
The ladle 5 is stored in the ladle storage chamber 6 of the ladle storage container 1. Then, the ladle storage container 1 is moved to the dust collection house 4 by moving the carriage 28 along the rail 29. After that, the furnace lid 2 is lowered by a cylinder device (not shown), and the furnace lid 2 is attached to the upper opening 7 of the ladle container 1. Further, the drive motor 15 is driven to lower the holding portion 13 and insert the electrode rods 12 into the respective electrode insertion holes 11. At this time, the electrode rod 12 is inserted up to near the slag.

In that state, a three-phase alternating current is applied to the electrode rod 12 of the electrode device 3 via the transformer to generate an arc between the electrode rod 12 and the molten steel M. As a result, the temperature of the molten steel M rises. At this time, the basic slag floats on the molten metal M surface.

Further, the inert gas supplied to the gas connecting portion 8a of the ladle container 1 is sent to the porous brick 5b at the bottom of the ladle 5 via the pipe 8b, and the molten steel M in the ladle 5 is fed from the porous brick 5b. Be blown into. As a result, the molten steel M is stirred and the reaction between the basic slag and the molten steel M is promoted. Therefore, due to the reaction between the floating slag and the molten steel M,
Chromium oxides, vanadium oxides, tungsten oxides, etc. in the slag are reduced to cause a reaction to float on the molten metal M molten metal surface and dust is generated from these slags. Further, iron oxide (FeO) reacts with carbon in the molten steel M in the ladle 5, and CO gas is generated in the ladle 5.

In the present embodiment, during refining, the air in the dust collection house 4 is sucked through the exhaust port 31 and depressurized by the operation of the dust collector, so the outside air outside the dust collection house 4 is collected from the air intake port 30. It is sucked into the dust house 4. At this time, in the present embodiment, since the inside of the ladle storage chamber 6 is pressurized by the temperature rise or the supply of the inert gas, the dust in the ladle 5 described above is generated on the wall surface of the electrode insertion hole 11 and the electrode. From the gap 16 between the outer surface of the rod 12 and the rod 12, the dust is discharged into the dust collecting house 4 in the direction of arrow B shown in FIG. Similarly, for CO gas, the electrode insertion hole 1
From the gap 16 between the wall surface of No. 1 and the outer surface of the electrode rod 12, the particles are discharged into the dust collection house 4 in the direction of arrow B shown in FIG.
As a result, dust, CO gas, and the like flow out of the dust collection house 4 through the exhaust port 31 by the suction action of the dust collector, are smoothly sucked by the dust collector, and are processed in the combustion tower. When refining is completed, the furnace lid 2 is slightly raised by a cylinder device (not shown) to remove it from the ladle storage container 1, and then the carriage 28 is run along the rail 29 to store the ladle as shown in FIG. The container 1 is removed from under the dust collection house 4.

(Effects of the embodiment) In the present embodiment, unlike the conventional case shown in FIG. 4, air is applied to the entire circumference of the peripheral edge of the furnace lid 2 attached to the upper opening 7 of the ladle container 1. Since the intake port 30 is located, air can be taken into the dust collection house 4 from the entire circumference of the furnace lid 2, and therefore the air intake port 102a is located at the lower part of the side wall of the dust collection house 4. Unlike the conventional device shown in FIG. 4 in which the air flow tends to be biased, the dust collection house 4
This is effective in preventing the problem that dust, CO gas, and the like remain inside, and that hot air stays inside. Therefore, the environment inside the dust collection house 4 can be satisfactorily secured, and the work environment when an operator enters the dust collection house 4 can be improved.

In this embodiment, the molten steel M is refined in the ladle 5 while supplying the inert gas into the ladle 5. Therefore, it is advantageous for suppressing the oxidation of the electrode rod 12 and for suppressing alloy oxidation loss in the ladle 5, and in this embodiment, the inside of the ladle storage container 1 is in a pressurized state, so that the outside air Is advantageous in preventing the intrusion into the ladle storage container 1 through the gap between the upper surface opening 7 of the ladle storage container 1 and the furnace lid 2. Therefore, in this embodiment, the problem of impairing the reducing atmosphere in the ladle 5 can be improved, which is advantageous for ensuring the hermeticity of the ladle 5.

In this embodiment, the drive motor 1 is used for the molten steel M in the ladle 5.
Since No. 5 is doubly insulated by the ladle container 1 and the first partition wall 20, it is possible to prevent the drive motor 15 from being directly affected by the heat of the molten steel M, and therefore the durability of the drive motor 15 is improved. It is effective in securing. Therefore, unlike the prior art shown in FIG. 4, the structure in which the drive motor 103 is cooled by the air sucked from the air intake port 102a may be omitted.

[Other Embodiments] In the above-described embodiments, the first house unit 1 may be used as necessary.
A partition wall may be formed between 8 and the second house portion 19. Further, in the above-mentioned embodiment, the reduction refining is carried out in the ladle 5, but the present invention is not limited to this, and may be applied when the oxidation refining is carried out in the ladle 5.

[Advantages of the Invention] As described above, according to the present invention, since the air intake port is formed all around the peripheral edge of the furnace lid attached to the upper opening of the ladle container, the outside air is formed. Is sucked into the dust collecting house from the entire circumference of the furnace lid, and the problem that the suction airflow is biased can be improved as compared with the conventional apparatus shown in FIG. Therefore, it is possible to solve the problem that dust, CO gas, hot air, and the like remain in the dust collection house.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of the apparatus of the embodiment, and FIG. 2 is an enlarged sectional view of a ladle container. FIG. 3 is a schematic cross-sectional view of the embodiment apparatus in a state where the carriage is running, and FIG. 4 is a schematic cross-sectional view of the conventional apparatus. In the figure, 1 is a ladle storage container, 2 is a furnace lid, 3 is an electrode device, 4
Is a dust collection house, 5 is a ladle, 6 is a ladle storage chamber, 7 is a top opening, 11 is an electrode insertion hole, 12 is an electrode rod, 13 is a holding part, 15 is a drive motor (driving part), and 18 is 1st house part, 19 is 2nd house part, 20 is 1st partition wall, 21 is 1st
An outer wall, 22 is a motor storage chamber (drive unit storage chamber), 23 is an electrode storage chamber, 25 is a second partition wall, 26 is a ceiling wall, and 27 is a second wall.
An outer wall, 30 is an air intake port, 31 is an exhaust port (dust suction part), and 32 is an operator entrance / exit.

Claims (1)

[Scope of utility model registration request] 1. A ladle accommodating chamber for accommodating a ladle in which molten metal is stored, and an upper surface opening communicating with the ladle accommodating chamber, wherein an inert gas supply unit connects the ladle accumulating chamber or the ladle accommodating chamber. A ladle storage container to which an inert gas is supplied in the pan, a furnace lid detachably attached to the upper opening of the ladle storage container and having an electrode insertion hole, and a wall surface defining the electrode insertion hole And an electrode device having an electrode rod inserted into the electrode insertion hole with a gap, a holding unit for holding the electrode rod, and a drive unit for outputting a driving force for moving the holding unit up and down, and dust suction And a first house part disposed laterally of the ladle storage container, and a first house part above the ladle storage container. An electrode storage chamber that is integrally arranged and stores most of the electrode rods of the electrode device is formed. And a second house part, and the dust collection house has an air intake port around the entire periphery of the furnace lid attached to the ladle storage container. apparatus.