KR102113661B1 - Structure and Construction Method Of Furanace Refractory Material - Google Patents

Abstract

The present invention relates to a structure and a method for constructing a refractory material of a low pressure furnace. According to the present invention, the method for constructing a refractory material of a low pressure furnace comprises: a floor material construction step (S110); an insulation board construction step (S120); a first insulation layer construction step (S140); a second insulation layer construction step (S170); a suction pipe installation step (S200); and a moisture removal step (S210). According to the present invention, the moisture contained in a refractory material can be completely removed.

Description

Construction and Construction Method of Furanace Refractory Material

The present invention relates to a refractory material construction structure and construction method of a low pressure furnace, and as the water removal step is additionally performed, a refractory material construction structure and construction method capable of completely removing moisture contained in the refractory material after the refractory material construction of the low pressure furnace is additionally performed. It is about.

In general, low-pressure casting is a method of solidifying by injecting molten metal at a lower pressure from the lower part of the mold to a lower pressure, unlike high-pressure casting such as die casting.

These low-pressure castings are mainly used for the production of engine blocks, cylinder heads, wheels, etc., since foreign matters such as casting defects and oxides are less mixed and precise castings can be manufactured.

The low pressure casting will be described in more detail as follows.

Equipped with a mold forming a product-shaped molding space therein and a low pressure furnace in which the molten metal is stored underneath, to use pressure or to increase the water level of the molten metal to at least one or more hot water pipes in the low pressure furnace. The molten metal is slowly injected into the injection port and the molding space through the mold.

At this time, a constant pressure is maintained until the molten metal in the mold completely solidifies.

The conventional low pressure furnace used for the low pressure casting is disclosed in Korean Patent Registration No. 10-1030168.

The conventional low pressure furnace is a vessel 11 with a heat source installed therein, a first insulating layer 12 surrounding the surface of the vessel 11, a second insulating layer 13 surrounding the surface of the first insulating layer 12, A first steel casing 14 surrounding the surface of the second insulating layer 13, an outer cross-section layer 15 surrounding the surface of the first steel casing 14, and a second surrounding a surface of the outer cross-section layer 15 It consists of a steel casing (16).

The first and second insulating layers and outer cross-section layers used in the low pressure furnace are mainly formed by mixing alumina or silica with mixed water and directly attaching them to each manufacturing step, or by using a wooden mold to form the manufacturing process. Is done.

In addition, after completion of the manufacturing steps of the first and second insulating layers and the outer cross-section layers at each stage, the drying process is completed to finally complete the low pressure furnace.

However, in the conventional drying step for the low pressure furnace, a method of naturally drying for a predetermined time is mainly used.

When the low pressure furnace is manufactured through a natural drying step as described above, there is a problem in that casting quality defects occur due to mixing of moisture in the molten metal during the casting process as the mixed water is not sufficiently discharged during the manufacturing process of the low pressure furnace.

In addition, when water is mixed into the molten metal, there is a problem in that bouncing of the molten metal may occur, resulting in personal injury due to a safety accident.

Republic of Korea Registered Patent Publication 10-1030168

Therefore, the object of the present invention is to solve the problems of the prior art as described above, as the water removal step is additionally performed, the refractory material at a low pressure capable of completely removing moisture contained in the refractory material after the construction of the refractory material at a low pressure. It is to provide a construction structure and a construction method.

According to the features of the present invention for achieving the above object, the construction and construction method of the refractory material according to the present invention, a flooring construction step of attaching a block-shaped floor insulation to the bottom surface of the furnace body, the An insulating board is installed along the bottom and side surfaces of the furnace body, and a first insulating material is prepared by mixing an insulating board construction step to insulate the inside of the furnace body and an amorphous refractory material composed mainly of silica and alumina and mixed water. A first insulating layer construction step attached to the outer surface of the insulating board, and a second insulating material is prepared by mixing an amorphous refractory material containing silica and alumina as a main component and a mixed water, and attaching it to the outer surface of the first insulating layer. Two insulation layer construction step, a plurality of water discharge holes are formed at regular intervals along the outer surface of the furnace body, a suction pipe installation step in which the suction pipe is connected to the water discharge hole, and a vacuum pump is installed at the end of the suction pipe, And a moisture removal step of sucking moisture generated inside the roche and discharging it to the outside.

Between the installation of the suction pipe and the removal of water, first and second heating steps for evaporating the mixed water mixed in each construction step are further included. In the first heating step, a heater is installed inside the low pressure furnace. , Heating the low pressure furnace to heat the molten metal to a predetermined temperature or higher before the molten metal is introduced, and the second heating step injects the molten metal into the low pressure furnace heated to a predetermined temperature or higher by the first heating step. To heat the low pressure furnace and vaporize the mixed water mixed in each construction step.

The flooring is carried out prior to the construction step, and the water guide member installation step of installing the water guide member at regular intervals along the inner surface of the furnace body is further performed, and the water guide member installation step is in the form of a "T" shaped hollow tube. Consisting of this, a water guide member having a plurality of water suction holes formed therethrough is installed in each water discharge hole to guide the water vapor generated inside the furnace body to the outside.

Consisting of a steel frame, a molten metal inlet through which molten metal is introduced, and a molten metal outlet for discharging molten metal to the outside after completion of casting are respectively formed, and a furnace body in which molten metal is stored, and a plurality of pieces along the outer surface of the furnace body It is formed through at regular intervals, a plurality of water discharge holes communicating with the inside, and each installed in the water discharge hole, and formed in the shape of a "T" shaped hollow tube, a plurality of water suction holes are formed through the outer circumferential surface, the Moisture guide member for guiding the water vapor generated inside the roche to the outside, and installed in the moisture guide member, respectively, in the form of a tube, one end is installed in the water discharge hole, the other end is connected to the water storage tank It includes a discharge hose and a vacuum pump connected to the water storage tank and generating vacuum to suck moisture through the water discharge hose.

It is characterized in that the heater installed in the furnace body is heated to a predetermined temperature or more, and the vacuum pump is suctioned while molten metal is filled in the furnace body.

The construction structure and method of refractory material in a low pressure furnace according to the present invention have the following effects.

The present invention is configured to sufficiently remove the moisture generated during the construction of the refractory material through a moisture removal step.

Therefore, by sufficiently removing the mixed water contained in the refractory material, it is possible to prevent the bouncing phenomenon of the molten metal due to the mixing of the water when the molten metal is introduced, and also to prevent the quality defect due to the mixing of the moisture of the molten metal.

In addition, as the first and second heating steps of evaporating the mixed water contained in the refractory material prior to the water removal step are additionally performed, there is an advantage that water removal can be more quickly performed.

1 is a process diagram showing a method for constructing a refractory material in a low pressure furnace according to the present invention.
Figure 2 is a flow chart showing a method for constructing a refractory material in a low pressure furnace according to the present invention.
Figure 3 is a cross-sectional view showing the configuration of a preferred embodiment of the refractory material construction structure of a low pressure furnace according to the present invention.
Figure 4 is a cross-sectional view showing the configuration of the moisture guide member constituting an embodiment of the present invention.
5 is a schematic view showing a state in which the suction pipe and the vacuum pump are connected to the furnace body constituting the embodiment of the present invention.

Hereinafter, preferred embodiments of the refractory construction structure and construction method according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a process diagram showing a method for constructing a refractory material in a low pressure furnace according to the present invention, and FIG. 2 is a flowchart showing a method for constructing a refractory material in a low pressure furnace according to the present invention, and FIG. 3 is a low pressure method according to the present invention. A cross-sectional view showing a configuration of a preferred embodiment of a refractory construction structure of a furnace is shown, and FIG. 4 shows a cross-sectional view showing a configuration of a moisture guide member constituting an embodiment of the present invention, and FIG. 5 constitutes an embodiment of the present invention A schematic diagram showing a state in which the suction pipe and the vacuum pump are connected to the furnace body is shown.

As shown in these drawings, the construction structure of the refractory material of the low pressure furnace according to the present invention is made of an iron frame, and the molten metal inlet 12 through which the molten metal is introduced, and the molten metal outlet for discharging the molten metal to the outside after casting is completed. (14) are formed respectively, a plurality of water discharge holes (30), which are formed through a plurality of regular intervals along the outer surface of the furnace body (10), and the molten metal is stored therein, and the inside of the furnace body (10). ), respectively installed in the water discharge hole 30, is made of a "T" shaped hollow tube, a plurality of water suction holes 34 are formed through the outer circumferential surface, generated inside the roche 10 The water guide member 32 for guiding water vapor to the outside, and the water guide member 32, respectively, are formed in a tube shape, one end is installed in the water discharge hole 30, the other end is a water storage tank ( 42) is connected to the suction pipe 40 connected to the water storage tank 42, and is made of a vacuum pump 44 for generating moisture through the suction pipe 40 and the like.

The roche 10 is made of an iron frame and is formed in a box shape through a welding process. A molten metal inlet 12 is formed on the upper left side of the roche 10. The molten metal inlet 12 is protruded so as to be inclined upward to the side of the furnace body 10, as shown in FIG. The molten metal inlet 12 serves to guide the molten metal to the inside of the roche 10.

A molten metal outlet 14 is formed on the lower left side of the roche 10. The molten metal discharge port 14 is formed through the left and right sides of the left side of the furnace body 10. The molten metal discharge port 14 communicates with the molten metal storage space 20 to be described later and serves as a passage for guiding the molten metal stored in the furnace body 10 to be discharged to the outside after the casting operation is completed.

A floor heat insulating material 22 is installed on the bottom surface of the roche 10. The floor heat insulating material 22 is a general insulating brick and detailed description is omitted. The floor heat insulating material 22 is fixed to the bottom surface of the furnace body 10 by applying a mortar to the bottom surface of the furnace body 10 and then attaching it to the upper side. The floor heat insulating material 22 is installed on the bottom surface of the furnace body 10, and serves to prevent heat of molten metal from escaping through the bottom surface side of the furnace body 10.

Insulating boards 24 are installed on sidewalls of the floor insulation 22 and the furnace body 10. The insulating board 24 is made of silica material and is formed in a board shape. The insulating board 24 is installed along the upper surface of the floor insulation 22 and the side walls of the furnace body 10. The insulating board 24 is fixedly installed on the inner wall surfaces of the floor insulation 22 and the furnace body through an anchor fixing method or an adhesive fixing method. The insulating board 24 is used as a heat insulating material, and serves to prevent heat from being discharged to the outside of the furnace body 10.

In addition, the insulating board 24 is installed on the inner wall surface of the molten metal inlet (12). The insulating board 24 is installed in a form in which a plurality of layers are stacked on the lower inner wall surface of the molten metal inlet 12. The insulating board 24 is installed on the inner wall surface of the molten metal inlet 12, and serves to block heat from being discharged to the outside through the molten metal inlet 12.

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A first insulating layer 26 is installed on an upper surface or side surface of the insulating board 24. The first insulating layer 26 is made of an amorphous refractory material, and silica (SiO2), aluminum oxide (Al2O3), calcium oxide (CaO), and the like are used as main components.

The mixing ratio of the first insulating layer 26 is a mixture of 31% silica, 35% aluminum oxide, and 33% calcium oxide and a predetermined amount of mixed water to prepare a first insulating material. The first heat insulating material is formed at a rate that increases the heat resistance, it can be modified in various forms depending on the user.

As shown in FIG. 2, the first insulating layer 26 is molded by injecting the first insulating material in a state in which the first neck 25 is installed inside the furnace body 10.

The first insulating layer 26 is installed on the top surface or side of the heat insulating board 24, to prevent the heat of the molten metal is discharged to the outside.

A second insulating layer 28 is formed on an upper surface or side surface of the first insulating layer 26. The second insulating layer 28 is made of an amorphous refractory material, and silica (SiO2), aluminum oxide (Al2O3), calcium oxide (CaO), iron oxide (Fe2O3), and the like are used as main components.

The mixing ratio of the second insulating layer 28 is a mixture of 12% silica, 81% aluminum oxide, 2% calcium oxide, and 1.5% iron oxide and a predetermined amount of mixed water to prepare a second insulating material. The second insulating material is formed at a rate that increases the strength and water repellency, which can be modified in various forms depending on the user.

As shown in FIG. 2, the second insulating layer 28 is molded by injecting the second insulating material in a state in which a second tree 27 is installed inside the furnace body 10.

The second insulating layer 28 is molded on the top surface or side of the first insulating layer 26 to prevent the penetration of the molten metal stored in the furnace body 10, and the heat of the molten metal is discharged to the outside It serves to prevent.

A plurality of water discharge holes 30 are formed on the outer surface of the furnace body 10. The water discharge hole 30 is formed through the outer surface of the furnace body 10 at regular intervals, and communicates with the interior of the furnace body 10.

The water discharge hole 30 serves as a passage for guiding water generated inside the roche 10 to the outside.

A water guide member 32 is installed at one side of the water discharge hole 30. The moisture guide member 32 is installed along the bottom and side surfaces of the furnace body 10, as shown in FIG. The moisture guide member 32 is formed in a “T”-shaped hollow tube shape, and a plurality of moisture suction holes 34 are formed through the outer circumferential surface. The moisture guide member 32 is installed at regular intervals along the inner wall surface of the furnace body 10, and serves to guide moisture to the outside when moisture is generated inside the furnace body 10.

A suction pipe 40 is installed outside the water discharge hole 30. The suction pipe 40 is a general hose and detailed description is omitted. The suction pipe 40, as shown in Figure 5, one end is connected to the water discharge hole 30, the other end is connected to the water storage tank 42 to be described later. The suction pipe 40 serves as a passage for guiding moisture discharged from the inside of the furnace body 10 toward the moisture storage tank 42.

A water storage tank 42 is installed at an end of the suction pipe 40. The water storage tank 42 is a general surge tank, and detailed description is omitted. The moisture storage tank 42 is a portion connected to the suction pipe 40 to store moisture discharged to the outside of the furnace body 10.

A vacuum pump 44 is installed on one side of the moisture storage tank 42. The vacuum pump 44 is a general vacuum pump 44, detailed description thereof will be omitted. The vacuum pump 44 is connected to the water storage tank 42, and serves to intake moisture inside the furnace body 10 through the suction pipe 40.

Hereinafter, a method for constructing a refractory material in a low pressure furnace of the present invention having the above-described configuration will be described with reference to FIGS. 1 to 5.

The construction method of the refractory material in the low pressure furnace is a flooring construction step (S110) of attaching a block-shaped floor insulation 22 to the bottom surface of the furnace body 10, and an insulation board along the bottom and side surfaces of the furnace body 10 ( 24) is installed, the insulation board construction step (S120) to insulate the interior of the furnace body (10), and a mixture of amorphous refractory materials composed mainly of silica and alumina and mixed water to prepare a first insulating material, which is A first insulating layer construction step (S140) attached to the outer surface of the board 24, a second insulating material is prepared by mixing an amorphous refractory material containing silica and alumina as a main component, and mixed water, and the first insulating layer 26 A second insulating layer construction step (S170) attached to the outer surface of the, and a plurality of water discharge holes 30 are formed at regular intervals along the outer surface of the furnace body 10, the suction pipe in the water discharge hole 30 The suction pipe installation step (S200) to which the 40 is connected, and a vacuum pump 44 is installed at the end of the suction pipe 40 to absorb moisture generated inside the furnace body 10 and discharge it to the outside. It includes a removing step (S210).

The flooring construction step (S110) is a step of attaching the floor insulating material 22 to the bottom surface of the furnace body 10 made of an iron frame. In the flooring construction step (S110), in the state in which a mortar is applied to the bottom surface of the furnace body 10, a block-shaped floor insulation 22 is attached to the front surface of the floor.

When the flooring construction step (S110) is completed, the insulation board construction step (S120) is performed. The insulation board construction step (S120) is a step of installing the insulation board 24 on the upper surface of the floor insulation material 22 and the side walls of the furnace body 10. In the insulation board construction step (S120), the insulation board 24 made of silica material is fixedly installed on the side surfaces of the floor insulation 22 and the furnace body through an anchor fixing method or an adhesive fixing method.

When the insulation board construction step (S120) is completed, a first wooden installation step (S130) is performed. The first neck installation step (S130) is a step of forming a filling space of the first insulation layer 26, which will be described later, by installing a first neck 25 inside the furnace body 10, as shown in FIG. 2. .

When the first wooden installation step (S130) is completed, a first insulating layer construction step (S140) is performed. The first insulating layer construction step (S140) is a step of forming the first insulating layer 26 on the top surface or side of the insulating board 24. The first insulating layer 26 is made of an amorphous refractory material, and silica (SiO2), aluminum oxide (Al2O3), calcium oxide (CaO), and the like are used as main components.

The mixing ratio of the first insulating layer 26 is a mixture of 31% silica, 35% aluminum oxide, and 33% calcium oxide and a predetermined amount of mixed water to prepare a first insulating material. The first heat insulating material is formed at a rate that increases the heat resistance, it can be modified in various forms depending on the user.

As shown in FIG. 2, in the first insulating layer 26, the first insulating material is introduced into the inside of the furnace body 10 while the first neck 25 is installed inside the furnace body 10. 26 is molded.

When the first insulating layer construction step (S140) is completed, the first tree removal step (S150) is performed. The first neck removing step (S150) is a step of removing the first neck 25 from the inside of the furnace body 10 after the molded first insulating layer 26 of the furnace body 10 is completely dried.

When the first die removal step (S150) is completed, the second die installation step is performed. The second neck installation step (S160), as shown in Figure 2, by installing the second neck 27 in a position spaced apart from the first insulation layer 26, a molding space of the second insulation layer 28 to be described later It is a step of forming.

When the second tree installation step (S160) is completed, a second insulating layer construction step (S170) is performed. The second insulating layer construction step (S170) is a step of forming a second insulating layer 28 on the top and side surfaces of the first insulating layer 26. The second insulating layer 28 is made of an amorphous refractory material, and silica (SiO2), aluminum oxide (Al2O3), calcium oxide (CaO), iron oxide (Fe2O3), and the like are used as main components.

The mixing ratio of the second insulating layer 28 is a mixture of 12% silica, 81% aluminum oxide, 2% calcium oxide, and 1.5% iron oxide and a predetermined amount of mixed water to prepare a second insulating material. The second insulating material is formed at a rate that increases the strength and water repellency, which can be modified in various forms depending on the user.

As shown in FIG. 2, the second insulating layer 28 is molded by injecting the second insulating material in a state in which a second tree 27 is installed inside the furnace body 10.

When the second insulating layer construction step (S170) is completed, a second tree removal step (S175) is performed. The second die removing step (S175) is a step of removing the second die 27 from the inside of the furnace body 10 after the molded second insulating layer 28 of the furnace body 10 is completely dried.

When the second tree removal step (S175) is completed, the suction pipe installation step (S200) is performed. The suction pipe installation step (S200) is a step of installing the suction pipes 40 in the plurality of water discharge holes 30 formed through the inside and through the outer surface of the furnace body 10, respectively.

The suction pipe 40 is a general hose and detailed description is omitted. One end of the suction pipe 40 is installed in the water discharge hole 30, the other end is connected to the water storage tank 42.

When the suction pipe installation step (S200) is completed, a water removal step (S210) is performed. In the water removal step (S210), the vacuum pump 44 connected to the water storage tank 42 is operated, and the water generated from the inside of the furnace body 10 is sucked through the suction pipe 40, and the furnace body ( 10) It is a step to remove moisture inside.

The water removal step (S210) is a step of removing the mixed water contained in the refractory material installed inside the furnace body (10).

By performing the above-described water removal step, by sufficiently removing the mixed water contained in the refractory material, it is possible to prevent the spattering of the molten metal due to the mixing of the water when the molten metal is added, as well as to prevent the poor quality due to the mixing of the moisture of the molten metal. It has the effect.

Before the moisture removal step as described above, the first and second heating steps may be additionally performed. The first heating step (S190) is a step of heating the furnace body 10 to a predetermined temperature or more by operating a heater installed in the furnace body 10. The first heating step (S190) is a step of heating the furnace body 10 before the molten metal is introduced into the inside of the furnace body 10, before the molten metal of high temperature is introduced into the furnace body 10, the furnace body 10 ) To prevent the occurrence of foreign matter in the molten metal, and the mixed water contained in the refractory material is vaporized.

When the first heating step (S190) is completed, a second heating step (S190) is performed. The second heating step (S190) is a step of heating the furnace body 10 by introducing a high-temperature molten metal inside the furnace body 10.

The second heating step (S190) is a process of heating the furnace body 10 using molten metal, and evaporating the mixed water of the refractory material to vaporize the mixed water.

That is, as the first and second heating steps are carried out, the mixed water contained in the refractory material is evaporated by heat, thereby vaporizing water, and thereby removing moisture more quickly.

In addition, it is carried out before the flooring construction step (S110), the water guide member installation step (S100) is further made to install the water guide member 32 at regular intervals along the inner surface of the furnace body (10);

The water guide member installation step (S100), as shown in Figure 4, is made of a "T" shaped hollow tube, a plurality of water suction holes 34 are formed on the outer circumferential water guide member 32 is discharged each water It is installed in the hole 30, it is a step of guiding the water vapor generated in the interior of the roche 10 to the outside.

That is, as the moisture guide member 32 is additionally installed, the moisture intake area inside the furnace body 10 is expanded, thereby reducing the water removal time.

The scope of the present invention is not limited to the embodiments illustrated above, and many other modifications based on the present invention will be possible to those skilled in the art within the technical scope as described above.

10. Roche 12. Melt inlet
14. Melt outlet 20. Melt storage space
30. Water discharge hole 32. Water guide member
34. Water intake hole 40. Intake tube
42. Moisture storage tank 44. Vacuum pump

Claims (5)

A flooring construction step (S110) of attaching a block-shaped floor insulation 22 to the bottom surface of the roce 10;
Insulation board 24 is installed along the bottom and side surfaces of the roche 10, and the insulation board construction step (S120) to insulate the interior of the roche 10;
A first insulating layer construction step (S140) of mixing the amorphous refractory material and the mixed water to produce a first insulating material, and attaching it to the outer surface of the insulating board 24;
A second insulating layer construction step (S170) in which a second insulating material is prepared by mixing the amorphous refractory material and the mixed water, and attaching it to the outer surface of the first insulating layer;
A plurality of water discharge holes 30 are formed at regular intervals along the outer surface of the roche 10, and a suction pipe installation step (S200) in which the suction pipes 40 are connected to the water discharge holes 30;
Including the; a vacuum pump 44 is installed at the end of the suction pipe 40, the water removal step (S210) to suck the moisture generated inside the roche 10 and discharge it to the outside;
Between the suction pipe installation step (S200) and the water removal step (S210), a first heating is performed to install a heater inside the low pressure furnace and heat the low pressure furnace to heat the low pressure furnace to a predetermined temperature or higher before the molten metal is introduced. Step (S180), the second heating step (S190), the first heating step (S180) by injecting molten metal into the interior of the low pressure furnace heated above a certain temperature to heat the low pressure furnace and mixed in each construction step Including the second heating step (S190) for vaporizing the mixed water,
Before the flooring construction step (S110), the moisture generated in the inside of the furnace body 10 is guided to the outside, in the form of a “T”-shaped hollow tube, and a plurality of moisture suction holes 34 are formed through the outer circumferential surface. While the guide member 32 is installed in each water discharge hole 30 at regular intervals along the inner surface of the roche 10, the water guide member installation step (S100) is further made,
Between the insulating board construction step (S120) and the first insulating layer construction step (S140), a first wooden installation step (S130) is performed to form a filling space of the first insulating layer inside the furnace body 10,
Between the first insulating layer construction step (S140) and the second insulating layer construction step (S170), after the first insulating layer formed on the furnace body 10 is completely dried, the first die is formed inside the furnace body 10. A first tree removal step 150 to remove, and a second tree installation step (S160) to form a forming space of the second insulating layer in the furnace body 10 is made,
Between the second insulating layer construction step (S170) and the suction pipe installation step (S200), after the second insulating layer formed on the furnace body 10 is completely dried, removing the second tree from the inside of the furnace body 10 In addition to the second tree removal step (S175) is carried out,
The amorphous refractory material in the first insulating layer construction step (S140) includes silica, aluminum oxide, and calcium oxide, and the amorphous refractory material in the second insulating layer construction step (S170) includes silica, aluminum oxide, calcium oxide, and iron oxide. Low pressure furnace refractory material construction method characterized in that. It is made of a steel frame, the molten metal inlet (12), the molten metal is introduced into the inside, the molten metal outlet (14) for discharging the molten metal to the outside after casting is formed, respectively, and the furnace body (10) in which the molten metal is stored;
A plurality of water discharge holes 30 are formed through the outer surface of the roche 10 at regular intervals, and communicate with the inside;
Each is installed in the water discharge hole 30, is made of a "T" shaped hollow tube, a plurality of water suction holes 34 are formed through the outer circumferential surface, the water vapor generated inside the furnace body 10 is external A moisture guiding member 32 guiding to;
A suction pipe 40 which is respectively installed in the moisture guide member 32, is formed in a tube shape, one end is installed in the moisture discharge hole 30, and the other end is connected to the moisture storage tank 42;
It is connected to the water storage tank 42, a vacuum pump 44 for generating moisture through the suction pipe 40 to generate a vacuum; includes,
The heater 50 installed in the furnace body 10 is heated to heat the furnace body 10 to a predetermined temperature or more, and the vacuum pump 44 is suctioned while molten metal is filled in the furnace body 10. Meanwhile,
A floor heat insulating material 22 made of an insulating brick and installed on the bottom surface of the furnace body 10;
It is formed of a board made of silica material and is fixedly installed on the inner wall surface of the furnace body 10, including the inner wall surface of the floor heat insulating material 22 and the molten metal inlet 12, the lower part of the molten metal inlet 12 Insulating board 24 is installed in the form of a plurality of stacked on the inner wall surface;
A first insulating layer 26 formed by installing a first insulating material prepared by mixing an amorphous refractory material containing silica, aluminum oxide, and calcium oxide and mixed water on the top and side surfaces of the insulating board 24;
A second insulating layer 28 formed by installing a second insulating material prepared by mixing an amorphous refractory material containing silica, aluminum, calcium oxide, and iron oxide and mixed water on the top and side surfaces of the first insulating layer 26; Including,
The first insulating layer 26 is constructed by installing a first die forming a filling space inside the furnace body 10 and then installing the first insulating layer 26 completely after drying, and then removing the first die,
The second insulating layer 28 is constructed after the second mold forming the molding space is installed inside the furnace body 10, the second insulating layer is completely dried, and then the second mold is removed by removing the second mold. Refractory construction structure. delete delete delete

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