KR101227382B1 - Melting Apparatus - Google Patents

Abstract

There is provided a melting apparatus including a melting furnace, in particular a melting furnace using microwaves (extreme microwaves).
The melting apparatus includes a melting furnace in which a molten material is injected and configured in a blast furnace type; And a microwave-applied heating unit provided to form the melt of the molten material to be heated by being heated through the microwaves applied to and applied to the melting furnace.
According to the present invention, by indirect heating method through the application of microwaves to melt the molten material such as magnesium to improve the operability, and also does not need the existing complex melt processing equipment, the product quality of the melt processed While making it possible to secure the equipment as a whole vertical blast furnace, while further minimizing tissue deformation through the associated casting rolls and guide rolls, such as to facilitate the production of plate (steel plate).

Description

Melting Apparatus

The present invention relates to a melting apparatus including a melting furnace, in particular, a melting furnace using microwaves (microwaves), and more particularly, to dissolving molten materials such as magnesium by indirect heating by applying microwaves. Not only does it improve, but it also eliminates the need for existing complex melt processing facilities and ensures the quality of products processed from melts, while constructing the equipment as a vertical blast furnace. The present invention relates to a dissolution apparatus that facilitates plate (steel plate) production while minimizing tissue deformation.

Magnesium products (steel plates) offer the smallest specific gravity of practical metals, high specific strength, excellent castability, machinability, dimensional stability and durability.

Therefore, related products (alloys) using magnesium have been widely used not only in automobile parts, communication parts, electronic parts, computers, portable electronic devices, but also as sports materials.

Of course, since such magnesium-related products are easy to corrode in the air, a surface treatment process is required to be used as a product.

Meanwhile, such magnesium products are processed and produced by die-casting, ingot casting, chill casting, or strip casting, which are first performed for the casting process. Melting (dissolving) of lumps.

By the way, the melting | dissolving magnesium used conventionally used the crucible system, such as a low alloy (low carbon) iron (Fe) crucible which heats and dissolves the magnesium ingot which used the burner, for example, the gas burner.

In the melting method of magnesium using such a crucible, primary melting of the magnesium (lump) is carried out in the crucible first, and then, an electric furnace is installed underground to maintain the control of an appropriate temperature. When supplied to the ground using a hoisting pump or the like, a magnesium steel sheet or sheet was produced using a casting roll (twin roll) (strip casting method).

However, the melting of magnesium using such a crucible or a crucible and an electric furnace is difficult to maintain a proper temperature through the second injection or step of the molten magnesium melt in the crucible, thus making it difficult to manufacture a wide rolled material. There is a situation.

In particular, a conventional crucible has a problem of partial cracking of the crucible due to a local temperature deviation as a rectangular shape.

In addition, such a melting method using the existing crucible, there is a problem that the generation of combustion materials (gas, etc.) is inevitable, has a very complex equipment, such as a burner and a fuel input line, difficult to maintain and maintain.

The present invention has been proposed in order to solve the conventional problems as described above, its object is to improve the operability by dissolving molten material such as magnesium by indirect heating method through the application of microwave instead of the crucible using the existing burner. Of course, it does not require complicated melt processing equipment of the existing crucible method, and it is possible to secure the product quality after processing the melt, while constructing the equipment as a vertical blast furnace overall, and additionally connected casting rolls and induction rolls It is an object of the present invention to provide a dissolution apparatus that facilitates the production of a sheet material (steel sheet) while minimizing tissue deformation.

As one technical aspect for achieving the above object, the present invention is a molten furnace in which the molten material is put and blast furnace; And

A microwave-applied heating unit provided to form a melt of the molten material introduced by being heated through the microwaves applied to and applied to the melting furnace;

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Gas curtain forming means provided to enable the air blocking on the inlet side provided in the upper portion of the melting furnace; And gate means provided to control the discharge of the melt in connection with the outlet side provided at the bottom of the melting furnace.

Moreover, as another technical aspect, this invention is the melting furnace which the to-be-melted material was thrown in and consists of blast furnace type; And
A microwave-applied heating unit provided to form a melt of the molten material introduced by being heated through the microwaves applied to and applied to the melting furnace;
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At least the heat generating portion of the melting furnace and the heat generating portion is formed in a circular cross section to remove the temperature deviation, and is provided in connection with the lower portion of the melting furnace further comprises a casting roll unit for processing the melt into a sheet material.

Preferably, the melting furnace is provided in a vertical blast furnace having a height but forming a space therein, a heat insulating material may be further provided between the outer shell and the heat generating portion constituting the melting furnace.

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More preferably, the outer side of the melting furnace further includes one or more or multiple magnetrons provided to apply the microwave to the microwave-applied heating unit, the magnetron is around the heating unit via a device control unit The exothermic temperature is controlled in conjunction with one or more temperature sensors provided.

At this time, the heat generating portion, silicon carbide heating element provided in the inner space of the melting furnace; And a crucible body provided inside the silicon carbide heating element and providing a melting space of the molten material.

Preferably, the crucible body further includes a stopper member for supporting the lumped material to be injected, wherein the silicon carbide heating element is provided as a variable heating element having a variable area so that the heating distribution of the molten space is variable. will be.

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More preferably, the casting roll unit includes a pair of casting rolls in which a melt is processed into a plate while the discharge duct associated with the melting furnace outlet is connected in a sealed state, and dam means of both sides of the casting roll, and the casting roll It further comprises one or more guide rolls and pinch rolls associated with.

More preferably, the casting roll unit and the induction roll are in a closed state, and further include a heating unit provided therein.

In this case, the molten material is provided as a magnesium lump, the outer shell constituting the melting furnace may be formed into a polygon having an opposite surface symmetrical to facilitate the installation of the magnetron.

According to such a melting furnace of the present invention, rather than dissolving the molten material (magnesium) using a crucible having a conventional burner, by using the radiant heat through the application of microwave to dissolve the magnesium to improve the operability further will be.

In particular, the present invention does not require the multi-stage treatment (transport) of the existing melt, so that the quality of the melt is stably ensured, while the equipment is constructed as a vertical blast furnace as a whole. It is possible to minimize the tissue deformation of the product.

Furthermore, the present invention prevents crucible cracks due to temperature deviations in existing crucibles of most rectangular structures, and in particular, forms at least an exothermic melting space in a circular cross section, thereby realizing uniform heat distribution in the circumferential direction of the melting furnace. By doubling the efficiency, it is possible to operate at least 10% less than the crucible at cost.

Finally, since the present invention uses a radiant heat by microwaves, rather than a combustion method using a conventional burner, the problem of environmental pollution due to the existing combustion does not occur.

1 is a block diagram showing a dissolution apparatus of a first embodiment according to the present invention,
2 is a schematic plan view of the dissolution apparatus of FIG. 1 according to the present invention;
3 is a block diagram showing a melting furnace of a second embodiment according to the present invention,
Figure 4 is a block diagram showing another modification of the invention in the dissolution device of Figures 1, 3 according to the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

First, FIG. 1 and FIG. 2 show the dissolution apparatus 1 of the first embodiment according to the present invention, and FIGS. 3 and 4 show modifications of the second and first and second embodiments of the present invention, respectively. It is shown.

For example, as shown in Figs. 1 and 2, the dissolution apparatus 1 of the present invention is provided as a vertical blast furnace having a molten material 10, for example, a magnesium lump having a melting point of about 650 ° C and having a height therein. Microwave application type heating unit 50 for dissolving the molten material 10 that is generated by heating through the melting furnace 30 and the microwaves provided and applied to the melting furnace 30 to form the melt 10 '. It may be provided as an example configuration including a.

Therefore, the melting apparatus 1 of the present invention uses the existing crucible and the molten material injected into the burner, that is, the method of melting magnesium, which is once melted into the interior of the vertical blast furnace melting furnace 30. It is easy to insert (10).

For example, magnesium lumps, which are the molten materials 10, may be sequentially introduced into the melting furnace 30 by gravity in the feeding conveyor 10a disposed above the melting furnace 30 as shown in FIG. 1. have.

Next, in the melting apparatus 1 of the present invention, the melting furnace 30 has a predetermined height but is provided in the space 32, for example, the heat generating unit 50 described in detail below, and the melted material 10. It is provided as a vertical blast furnace having a space 32 provided as an input passage of.

That is, since the melting furnace 30 of the present invention is provided in a vertical blast furnace type, it will provide an advantage that the heat loss is low, and continuous operation is possible. At this time, between the outer shell 34 constituting the melting furnace 30 and the heat generating unit 50, a heat insulating material 36 for temperature preservation, for example, a known heat insulating material such as refractory body to absorb and preserve heat, asbestos to block the movement of heat. Can be filled.

On the other hand, preferably, as shown in Figures 1 and 2, the outer shell 34 of the melting furnace 30 is to be widened downwards to expand the heat insulating material space of the portion where the heat generating portion 50 is disposed, The space 32 is formed in a circular cross section.

At the same time, the heat generating body 52 and the crucible body 54 inside the microwave application type heat generating section 50 described in detail below are also formed in the same manner as the melting furnace inner space 32 in a planar cross section.

Therefore, in the melting apparatus 1 of the present invention, since the internal heating portion 50 of the melting furnace 30 is formed in a circular cross section, a uniform temperature content in which the overall temperature deviation does not occur as compared with the conventional crucible of the crucible. The furnace is formed, and thus heat is evenly transferred to the melted material, so that local cracking of the furnace due to temperature deviation is suppressed.

And, as shown in Figure 1, the lower part of the melting furnace 30 of the present invention is provided with a kite and building unit 35 on the device frame (unsigned) to build a whole heat-resistant structure while the lead and the building unit serves to support the weight of the melting furnace In addition, the lead and the building portion 35 is formed with an outlet 40 of a passage through which hot melt 10 ', ie, molten magnesium is discharged, and an outlet tube 40a for blocking scattering of the melt at the outlet 40. Can be connected.

By the way, the molten material 10 to be introduced into the melting furnace 30 of the present invention has been described above as an example of magnesium, but is not necessarily limited thereto, the material having a low melting point containing at least magnesium as a main component, or approximately melting point Melting of iron at around 1410 ° C is also possible.

On the other hand, as shown in Figures 1 and 2, the gas curtain forming means (conical inlet shell 38a in the upper portion of the inlet 38, which is an opening portion of the space 32 formed in the upper part of the melting furnace 30 of the present invention ( 70 may further be provided.

That is, the gas curtain forming means 70 includes gas supply nozzles 72 installed in the conical direction along the conical inlet shell 38a, so that the gas injected from the supply nozzle is the gas curtain portion 74. Is formed at the inlet side, and such a gas curtain part blocks the oxygen or other foreign matter from entering the furnace.

In addition, as shown in Figures 1 and 2, the lead and the building section 35 built in the lower part of the melting furnace of the present invention is connected to the discharge port 40, the gate means provided to control the discharge of the melt (10 ') 90 may be further included.

That is, the gate means 90 includes a gate member (yeonwa) 92 provided between the upper and lower support (brick) 96 while sliding to the cylinder 94 installed on the outer edge of the melting furnace and the construction unit 35. can do.

Thus, the opening degree of the outlet port is controlled as the gate member in accordance with the cylinder operation, which makes it possible to smoothly control the discharge according to the melt formation at the beginning and end of the melting or the middle portion.

Next, as shown in FIGS. 1 and 2, in the dissolution apparatus 1 of the present invention, the microwave-applied heat generating unit 50 that enables the melting of the molten material 10 substantially includes the melting furnace ( And a silicon carbide (SiC) heating element 52 provided at the center of the internal space of the device 30.

In addition, the inner center of the heating element 52 is provided with a crucible body 54 in which the actual melt is contacted. Such a crucible body 54 may be provided with pure iron or stainless steel (for example, SUS 401 series). .

Of course, when the molten material 10 is a magnesium having a low melting point, the crucible body 54 is made of pure iron or stainless steel. However, since the melting point is higher than magnesium when the molten material is iron, the material of the crucible body 54 is higher. What is necessary is just to provide it with the crucible body formed from a heat resistant material, for example, ceramic.

In other words, the crucible may be appropriately selected corresponding to the melting point of the molten material.

1 and 2, at least one or a plurality of magnetrons 56 provided at the outside of the melting furnace 30 to apply microwaves to the microwave application type heating unit 50. Can be provided.

At this time, more preferably, the outer shell 34 may be formed in multiple shapes, for example, octagonal shapes, to form symmetrical surfaces facing each other, so that two pairs of magnetrons 56 may be provided.

On the other hand, as shown in Figure 1, the magnetrons 56, such as a thermocouple and the horizontal sensor disposed horizontally at the center and the lower side of the heating unit 50, respectively, via the device control unit (C) and Can be linked.

Therefore, the device control unit C adjusts the intensity (strength) of the microwaves generated in the magnetron 56 according to the melt or melting furnace internal temperature, and thus the heating element 52 of the silicon carbide in which the microwaves are smoothly absorbed is The degree of heat generation can be controlled according to the intensity of the microwaves.

Meanwhile, in the present invention, silicon carbide (SiC) that is self-heated by applying microwaves substantially generated from the magnetron 56 is known as an optimal material as a heating element. For example, such silicon carbide (SiC) is Density is 3.22 g / cm3 (solid).

Therefore, since the silicon carbide heating element 52 is an artificial mineral produced by covalent bonding, it can be manufactured in a desired form according to the melting furnace structure of the present invention, and has a higher hardness than a material such as alumina, and thus wear resistance. And hardness is excellent.

In addition, since it has high thermal conductivity, corrosion resistance, and chemical resistance, and has a low coefficient of thermal expansion, the breakage rate will be low even when used as a heating element for a long time.

Therefore, since it has high thermal conductivity, abrasion resistance, and hardness, the heating element of silicon carbide is self-heated even when microwaves are applied, and the radiant heat is transferred to the molten material 10 introduced through the crucible body 54. It will be melted smoothly.

On the other hand, as shown in FIG. 1, in the melting apparatus 1 of the present invention, the crucible body 54 of the heat generating portion inside the melting furnace space 32 is preferably a molten material 10 that is injected, that is, a magnesium mass. It may further include a stopper member (54a) for supporting the initial melting.

Next, as shown in FIG. 4, the outer diameter of the silicon carbide heating element in the portion corresponding to the molten material 10 that is injected in the present invention, that is, the portion corresponding to the melting center portion A that is melted in a state where magnesium ingots are stacked. It is also preferable to provide the extended downward conical deformable heating element 52 '.

Therefore, as shown in FIG. 4, since the area (volume) of the heating element 52 is variable at the melting center A, the heat generating body 52 generates heat during the application of microwaves, particularly in the protrusion of the lower portion where the area is increased to the maximum. The temperature can be formed higher, and eventually, the magnesium ingot initially injected is most smoothly melted in the melting center A of the heat generating unit 50, so that the melt 10 'is faster than in the case of FIGS. The melt 10 'is formed to further promote melting of the lumps melted in the inner space 32.

Next, Figure 3 shows the melting apparatus 1 of the second embodiment according to the present invention, the basic configuration of the melting furnace 30 and the heating unit 50 is similar, for example to continuously produce a magnesium steel sheet (plate) In order to further include the casting roll unit 100 for processing the melt associated with the lower portion of the outlet 40 of the melting furnace 30 of the melting apparatus 1 of the present invention into a plate.

That is, the casting roll part 100, the discharge duct 110 associated with the melting furnace outlet is connected in a sealed state, the melt 10 'is a pair of casting the member 10 ", that is, a magnesium steel sheet cast Cold casting rolls 130a and 130b, and both sides of such a casting roll includes a dam means 134 for trapping the melt to be cooled between the casting rolls to be processed into a steel sheet (plate).

At this time, the casting rolls (130a, 130b) in the hot melt 10 'is temporarily confined between the dam means 134 and the casting roll in the state in which they are rotated in the opposite direction to each other by the gap through the casting roll It can be produced in a zefom having a thickness of.

Meanwhile, as shown in FIG. 3, in the dissolution apparatus 1 of the present invention, one or more induction rolls 150 and pinch rolls 170 connected to the pair of casting rolls 130a and 130b are further added. It may be provided to include.

Therefore, in the final melting apparatus 1 of the present invention, when the molten material 10, ie, magnesium lump, is injected through the conveying conveyor at the upper part of the melting furnace, it is melted in the heat generating unit, and the resulting melt 10 'is formed on a casting roll. Rolling in between may finally be provided as a steel sheet in the pinch roll.

At this time, the casting roll 130 and the guide roll 150 may be further provided with a heating unit 190 adjacent.

That is, a heating means 190, that is, a heating means such as a heating coil or an induction heater, is formed between the casting roll 130 and one side guide roll 152 and one side guide roll 152 and the other guide roll 154 opposite. It is provided to maintain a constant internal atmosphere temperature passing through the casting roll and the induction roll, it is possible to make a higher quality steel sheet through the gradual change of the steel sheet.

On the other hand, as shown in Figure 3 it is preferable to install a cover body 192 on the casting roll and the induction roll in order to maintain the high temperature atmosphere temperature through the heating means 190. Since the cover member 192 is preferably a material having a certain heat resistance, it surrounds the steel sheet to be cast, so that oxygen contact or other foreign matter contact with the surface of the steel sheet is blocked, thereby making steel sheet more uniform. Will do.

In this case, preferably, the casting rolls and the induction rolls are formed with coolant passages 132 and 156 to enable continuous use of the rolls at a high temperature, and in particular, the casting rolls are cooled through the cooling of the melt 10 '. As it enables casting to strip (strip casting), smooth cooling implementation is required. Of course, although schematically illustrated in the drawings, the coolant passages may be provided in connection with a coolant supply and return line through a rotary joint mechanism.

In addition, one side and the other guide rolls can be appropriately controlled while maintaining the tension by varying the plate diameter.

Accordingly, the dissolving apparatus 1 of the present invention described so far is more environmentally friendly than the conventional combustion method using microwaves, and is particularly provided in a vertical blast furnace type, and in accordance with necessity, a high quality steel sheet ( Plate) production is possible.

At least, as shown in FIG. 1, the melt 10 ′ may be discharged from the melting furnace to the container 2 on the moving trolley, so that the melt may be easily processed, molded, or mainly introduced into the process.

While the invention has been shown and described in connection with specific embodiments so far, it will be appreciated that the invention can be variously modified and varied without departing from the spirit or scope of the invention as set forth in the claims below. It will be appreciated that those skilled in the art can easily know.

1 .... melting device 10 ... blood melting material
30 .... Melting Furnace 32 .... Internal Furnace
34 .... Jacket 36 .... Insulation
50 .... heating element 52 .... heating element (silicon carbide)
54 .... Crucible 56 .... Magnet Ron
58 .... Temperature sensor 70 .... Gas curtain forming means
90 .... gate means 100 .... casting roll part
110 .... Exhaust duct 130a, 130b .... Casting roll
150 .... induction roll 170 .... pinch roll
190 .... Heating

Claims (10)

A melting furnace 30 into which the molten material 10 is injected and configured as a blast furnace; And
A microwave-applied heating unit (50) provided to form a melt of the molten material injected into and generated by the microwaves applied to and applied to the melting furnace (30);
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Melt in conjunction with the gas curtain forming means 70 and the outlet 40 provided in the lower portion of the melting furnace 30 provided to enable the air blocking on the inlet 38 provided on the upper side of the melting furnace 30 At least one of the gate means (90) provided to control the discharge of (10 ').
A melting furnace 30 into which the molten material 10 is injected and configured as a blast furnace; And
A microwave-applied heating unit (50) provided to form a melt of the molten material injected into and generated by the microwaves applied to and applied to the melting furnace (30);
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At least a heat generating portion of the melting furnace 30 and the heat generating portion 50 is formed in a circular cross section so as to remove the temperature deviation, and further connected to the lower portion of the melting furnace 30 casting roll portion 100 for processing the melt into a sheet material Containing dissolution device.
The method according to claim 1 or 2,
The melting furnace 30 is provided as a vertical blast furnace having a height but forming a space 32 therein, and an insulating material 36 between the outer shell 34 constituting the melting furnace 30 and the heat generating part 50. Dissolution apparatus characterized in that it is further provided.
The method according to claim 1 or 2,
The outer side of the melting furnace 30 further includes one or more or multiple magnetrons 56 provided to apply microwaves to the microwave application type heating unit 50,
The magnetron is dissolving device, characterized in that the heating temperature is controlled in connection with one or more temperature sensors (58) provided around the heating portion via a device control unit (C).
The method according to claim 1 or 2,
The heating unit 50, the silicon carbide heating element 52 provided in the inner space 32 of the melting furnace; And
A crucible body 54 which is provided inside the silicon carbide heating element 52 and provides a melting space of the melted material;
Dissolution apparatus, characterized in that configured to include.
The method of claim 5,
The crucible body 54 further includes a stopper member 54a for supporting the lumped material 10 to be injected.
The silicon carbide heating element (52) is a dissolving apparatus, characterized in that the heating element distribution of the melting space (A) is provided as a variable heating element (52 ') variable in area.
The method of claim 1,
At least a heat generating portion of the melting furnace 30 and the heat generating portion 50 is formed in a circular cross section to remove the temperature deviation,
Dissolution apparatus characterized in that it further comprises a casting roll portion (100) for processing the melt into a plate in connection with the lower portion of the melting furnace (30).
8. The method according to claim 2 or 7,
The casting roll part 100 is a pair of casting rolls 130a and 130b in which the melt 10 'is processed into a plate 10 "while the discharge duct 110 associated with the melting furnace outlet is connected in a sealed state. And dam means 134 on both sides of the casting roll,
Melting apparatus further comprises at least one of at least one guide roll (150) and pinch roll (170) associated with the casting roll.
9. The method of claim 8,
The casting roll unit and the induction roll is connected in a sealed state, the dissolution apparatus further comprises a heating unit 190 provided therein.
The method according to claim 1 or 2,
The molten material (10) is provided as a magnesium lump, the outer shell constituting the melting furnace (34) is characterized in that formed in a polygon having an opposite surface symmetrical to facilitate the installation of the magnetron.

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