JP2017125659A - Metal melting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metal melting device that can be made compact on the whole.SOLUTION: A metal melting device comprises a crucible 20 for reserving molten metal inside, an agitation part 30 for agitating the molten metal in the crucible 20, and a heating part 40 for heating the crucible 20. The agitation part 30 includes a cylindrical member 32 installed at a center part of the crucible 20 in a vertical direction, a plate-like member 31 connected to an upper end part of the cylindrical member 32 and placed in a horizontal direction, and a swirl rise flow generation part 33, M1 for generating a swirl rise flow of the molten metal in the cylindrical member 32. An annular gap Z is formed between an outer edge of the plate-like member 31 and the crucible 20. The inside of the single crucible 20 can be used as a temperature raising chamber and a melting chamber. Therefore, the device can be made compact on the whole as compared with a configuration in which a temperature raising chamber and a melting chamber are individually provided.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a metal melting apparatus.

  2. Description of the Related Art Conventionally, a metal melting apparatus that melts a metal material such as an aluminum alloy for use in manufacturing various cast products is known (see, for example, Patent Document 1). The apparatus described in this document includes a temperature raising chamber for heating the molten metal and a melting chamber (vortex chamber) for immersing and melting the charged metal material by vortex. Using a circulation pump, the molten metal in the temperature raising chamber is supplied to the melting chamber, and the molten metal discharged from the melting chamber is returned to the temperature raising chamber.

  In the apparatus described in the above document, the heating chamber and the melting chamber are provided separately. Therefore, in order to configure the entire apparatus, a space for providing the temperature raising chamber and a space for providing the melting chamber are required separately, and as a result, there is a problem that the entire apparatus is increased in size.

  The present invention has been made to address the above problems, and an object of the present invention is to provide a metal melting apparatus that can be made compact as a whole apparatus.

WO2015 / 050208 Publication

  The metal melting apparatus according to the present invention has an opening at the top, a crucible for storing a molten metal for melting a metal material therein, and agitating the molten metal stored in the crucible inside the crucible. A stirring unit that generates a flow of the molten metal and a heating unit that heats the crucible are provided.

  According to this, since the crucible is heated by the heating unit, the inside of the crucible functions as a temperature raising chamber. In addition, since the molten metal stored inside the crucible is stirred by the stirring unit, the inside of the crucible also functions as a melting chamber (vortex chamber). That is, the inside of a single crucible can be used as a heating chamber and a melting chamber. Therefore, as compared with the apparatus described in the above document in which the temperature raising chamber and the melting chamber are provided separately, the entire apparatus can be made compact.

  In the metal melting apparatus according to the present invention, the stirring portion is a cylinder arranged in the vertical direction in the molten metal stored in the crucible at the center of the crucible when the crucible is viewed from above. And a swirl upward flow generator that generates a swirl upward flow that rises while swirling with respect to the molten metal located inside the tubular member.

  According to this, the molten metal located in the lower part inside the crucible is introduced into the cylindrical member from the lower end portion of the cylindrical member. The molten metal introduced into the tubular member rises while turning inside the tubular member, and is discharged to the outside of the tubular member through the upper end portion of the tubular member. The molten metal located at the upper part inside the crucible discharged to the outside of the cylindrical member descends along the inner wall surface of the crucible and returns to the lower part inside the crucible. The molten metal returned to the lower part inside the crucible is again introduced into the tubular member from the lower end of the tubular member. As a result, the entire molten metal stored in the crucible is easily circulated uniformly.

  In the metal melting apparatus according to the present invention, the stirring portion includes a plate-like member that is connected to the upper end portion of the cylindrical member and is disposed along the horizontal direction in the molten metal stored in the crucible. It is preferable that a gap is formed between the outer edge of the plate member and the inner wall surface of the crucible.

  According to this, in the molten metal stored inside the crucible, the depth of the molten metal with the upper surface (horizontal plane) of the plate-shaped member as the bottom surface so as to continue along the horizontal direction from the upper end of the cylindrical member. A small shallow area is formed. Therefore, the molten metal discharged while turning from the upper end portion of the cylindrical member moves to the shallow portion, and after moving to the shallow portion, the outer edge of the plate-like member (therefore, inside the crucible) It spreads toward the wall. Then, the molten metal that has reached the outer edge of the plate-like member passes through a gap formed between the outer edge of the plate-like member and the inner wall surface of the crucible, and then descends along the inner wall surface of the crucible.

  This configuration is `` undried bulk metal material such as briquette obtained by compressing and solidifying metal powder such as aluminum chips, so that the whole is not immersed when thrown into the shallow part It is preferable to be applied when the “shaped product” is put into the shallow section. That is, when such a bulk metal material is introduced into a shallow portion, the molten metal that is swirled in a horizontal plane while being gradually reduced in volume by being melted by the molten metal with its upper portion exposed from the molten metal surface. Move along the shallows along the flow of the river. In this process, oil smoke and water vapor derived from oil moisture such as cutting oil adhering to the metal material can be released from the portion of the bulk metal material exposed from the molten metal. Therefore, it is possible to safely remove oil and moisture from the bulk metal material without performing a drying process before adding the bulk metal material.

  The massive metallic material that moves in the shallow portion while reducing the volume reaches the gap and stays in the vicinity of the gap until the volume is reduced to a size that can pass through the gap. When the volume is reduced to a size capable of passing through the gap, the bulk metal material passes through the gap, and then descends along the inner wall surface of the crucible along the flow of the molten metal circulating inside the crucible. .

  The metal melting apparatus according to the present invention includes a furnace body that houses the crucible therein, and the heating unit is a fuel in a combustion chamber defined by an outer wall of the crucible and a side wall and a bottom wall of the furnace body. Derived from an oil component contained in the metallic material that is discharged into an upper space defined by a burner that burns gas to heat the crucible, an opening of the crucible, and an upper wall of the furnace body It is preferable to include an oil smoke introduction section that guides oil smoke to the combustion chamber.

  According to this, oil smoke derived from oil moisture such as cutting oil adhering to the metal material is guided to the combustion chamber, and the oil smoke guided to the combustion chamber is burned by the burner in the same manner as the fuel gas (secondary combustion). ). Therefore, the oil smoke can be reused as the burner fuel, so that energy efficiency is increased. In addition, it can be made harmless by completely burning oil smoke.

  In the metal melting apparatus according to the present invention, the metal melting apparatus includes a charging unit for charging the metal material into the molten metal stored in the crucible, and the charging unit includes the metal material waiting in the charging unit, It is preferable that the oil smoke introduction unit is configured to be positioned in the middle of a path along which the oil smoke moves from the upper space to the combustion chamber. According to this, it is possible to perform a preliminary drying process on the metal material waiting in the charging unit before the charging.

FIG. 1 is a main cross-sectional view schematically showing a schematic configuration of an embodiment of a metal melting apparatus according to the present invention. 2 is a cross-sectional view corresponding to line 2-2 in FIG.

  Hereinafter, an embodiment of a metal melting apparatus according to the present invention (hereinafter referred to as “this embodiment”) will be described with reference to FIGS. 1 and 2. This embodiment is used to melt a metal material such as an aluminum alloy with a molten metal. The molten metal material is then used in the manufacture of various cast products.

(Constitution)
As shown in FIGS. 1 and 2, the present embodiment heats the furnace body 10, the crucible 20 housed in the furnace body 10, the stirring unit 30 for stirring the molten metal in the crucible 20, and the crucible 20. And a charging unit 50 for waiting for the metal material to be melted.

  The furnace body 10 generally has a bottom wall 11, a side wall 12, and an upper wall 13, and covers the entire crucible 20 accommodated therein. The bottom wall 11, the side wall 12, and the top wall 13 are made of a heat resistant material. In this example, the bottom wall 11 and the side wall 12 are provided integrally, and the upper wall 13 is provided detachably with respect to the side wall 12. Since the upper wall 13 is detachable, it is easy to perform operations such as maintenance of the crucible 20 (including replacement of the crucible 20 itself).

  A pedestal 18 is provided on the inner surface of the bottom wall 11, and a crucible 20 is arranged on the pedestal 18 so that the upper part is opened. A combustion chamber S <b> 1 is defined by the outer wall of the crucible 20, the bottom wall 11, and the side wall 12. Further, the upper space S2 is defined by the opening of the crucible 20 and the upper wall 13.

  An exhaust passage 14 that communicates the combustion chamber S1 and the outside is formed in a part of the side wall 12 and the upper wall 13. In the middle of the exhaust passage 14, a passage 15 for introducing secondary air into the exhaust passage 14 is provided. The exhaust passage 14 also communicates with the upper space S2 through the passage 16. Further, the upper space S2 and the combustion chamber S1 communicate with each other through a passage 17.

  The crucible 20 is a hot metal-like heat-resistant container that is open along the top and bottom (vertical direction) and has an open top, in which high-temperature molten metal is stored. In this example, the crucible 20 has a rotationally symmetric shape with respect to an axial center extending in the vertical direction.

  A part of the upper end surface constituting the opening of the crucible 20 is lower than the other part of the upper end surface, and this part is used as the molten metal outlet 21. One end of a flange 22 is connected to the outlet 21. The trough 22 traverses the inside of the exhaust passage 14 while being slightly inclined downward from the outlet 21, and the other end of the trough 22 is exposed to the outside through an opening provided in a part of the side wall 12. . In addition, a barrier 23 for preventing the metal material introduced into the crucible 20 from flowing out of the outlet 21 immediately before melting is fixed to the upper wall 13 in the vicinity of the outlet 21. .

  The stirring unit 30 includes a plate-shaped member 31, a cylindrical member 32, a stirring rod 33, and a motor M1. The plate-shaped member 31 is a donut-shaped flat plate as viewed from above. The plate-like member 31 is suspended from the upper wall 13 using a predetermined hanging jig or the like, and is fixed coaxially with the crucible 20 so as not to be relatively movable. The plate-like member 31 is disposed along the horizontal direction at a position lower by a predetermined amount than the height of the outlet 21. An annular gap Z is formed between the outer peripheral edge of the plate-like member 31 and the inner wall surface of the crucible 20.

  The cylindrical member 32 is a cylindrical member. The cylindrical member 32 has its upper end connected and fixed over the entire inner periphery of the plate-shaped member 31 and fixed to the crucible 20 coaxially and relatively unmovably. The cylindrical member 32 is arranged along the vertical direction (vertical direction) from the inner peripheral edge of the plate-like member 31 downward. The lower end portion of the cylindrical member 32 is in contact with the inner wall surface of the bottom portion of the crucible 20. In the lower end portion of the cylindrical member 32, inlets 32a (in this example, four locations at equal intervals in the circumferential direction) for introducing the molten metal outside the cylindrical member 32 into the cylindrical member 32 are formed. ing.

  The stirring rod 33 is a rod-like member having a screw 33a provided at the tip (lower end). The stirring bar 33 is provided so as not to move in the axial direction relative to the upper wall 13 and to be rotatable in the direction around the axis, and is arranged coaxially with respect to the crucible 20. The stirring bar 33 is disposed along the vertical direction (vertical direction), and the substantially lower half including the screw 33 a is located inside the cylindrical member 32. Here, the stirring rod 33 provided with the screw 33a and the motor M1 correspond to the “swirl upflow generation part” of the present invention.

  The motor M1 is fixed to the upper wall 13 and is configured to drive the stirring rod 33 to rotate about an axis in a predetermined first rotation direction. When the stirring bar 33 rotates in a predetermined first rotation direction, a flow that rises while swirling with respect to the molten metal located inside the cylindrical member 32 (a swirling upward flow) is generated.

  The heating unit 40 includes a burner 41, a fan 42, and a motor M2. The burner 41 is provided at a part of the side wall 12 so as to face the combustion chamber S1. The burner 41 burns fuel gas in the combustion chamber S1 by using fuel gas and air introduced from outside through a fuel gas introduction pipe and an air introduction pipe (not shown). The crucible 20 is heated by the combustion heat of the fuel gas.

  The fan 42 is provided in the middle of the passage 17 that connects the upper space S2 and the combustion chamber S1. The fan 42 is rotationally driven in a predetermined second rotational direction by the motor M2. When the fan 42 rotates in a predetermined second rotation direction, a flow is generated in which the gas in the passage 17 moves from the upper space S2 side to the combustion chamber S1 side. Here, the fan 42, the motor M2, and the passage 17 correspond to the “oil smoke introduction part” of the present invention.

  The charging unit 50 includes a charging chute 51 and an impeller 52. The input chute 51 is fixed to the upper wall 13. Inside the charging chute 51, a passage for moving a metal material having both ends of the inlet 51a and the outlet 51b is formed. The impeller 52 is rotatably provided so as to close the passage at a midpoint of the passage. The impeller 52 may be manually driven to rotate or may be driven to rotate electrically using a motor or the like.

  The metal material thrown in from the inlet 51a is temporarily held at the position of the impeller 52. The waiting metal material is discharged toward the outlet 51b by an amount corresponding to the rotation angle of the impeller 52. The discharged metal material is introduced into the molten metal in the crucible 20 from the outlet 51b through the opening of the crucible 20.

  The impeller 52 located in the charging chute 51 is also located in the middle of the passage 17 connecting the upper space S2 and the combustion chamber S1. Therefore, the metal material waiting at the position of the impeller 52 is also located in the middle of the passage 17.

  The motor M1, the motor M2, and the burner 41 described above are controlled by a computer shown in FIG. That is, the rotational speed of the stirring rod 33, the rotational speed of the fan 42, and the heating power of the burner 41 are appropriately adjusted and controlled by the computer according to the situation.

(Operation)
Hereinafter, the operation of the present embodiment configured as described above will be described. During the operation of the present embodiment, the rotational speed of the stirring bar 33, the rotational speed of the fan 42, and the heating power of the burner 41 are controlled by a computer.

  During the operation of the present embodiment, the liquid level of the molten metal stored in the crucible 20 is usually adjusted naturally so as to substantially coincide with the height of the outlet 21. That is, when the molten metal volume increases due to the melting of the charged metal material and the height of the molten metal exceeds the height of the outlet 21, the molten metal is discharged from the outlet 21 to the outside through the trough 22. Is done. As a result, the liquid level of the molten metal tends to return naturally to the height of the outlet 21.

  In other words, the molten metal can be taken out from the outlet 21 by an amount corresponding to the amount of the metal material charged. The extracted molten metal (that is, the molten metal material) is used for manufacturing various cast products.

  As described above, the plate member 31 is disposed along the horizontal direction at a position lower than the height of the outlet 21 by a predetermined amount. Further, the cylindrical member 32 is arranged downward from the inner peripheral edge of the plate-like member 31. Therefore, in a state where the liquid level of the molten metal stored in the crucible 20 substantially matches the height of the outlet 21, the plate-like member 31 and the cylindrical member 32 are below the liquid level of the molten metal (that is, in the molten metal). Is located.

  As a result, in the molten metal stored in the crucible 20, the upper surface of the plate-like member 31 is continuous along the horizontal direction from the upper end portion of the tubular member 32 (therefore, the inner peripheral edge of the plate-like member 31). A “shallow part” having a small depth of molten metal with a (horizontal plane) bottom is formed.

  When the stirring rod 33 (and hence the screw 33a) is rotated in the predetermined first rotation direction by the motor M1, a swirling upward flow is generated with respect to the molten metal located inside the cylindrical member 32 as described above.

  When such a swirling upward flow is generated, the molten metal located at the lower part in the crucible 20 is introduced into the cylindrical member 32 through the inlet 32 a at the lower end of the cylindrical member 32. The molten metal introduced into the tubular member 32 rises while turning inside the tubular member 32, and is discharged while turning from the upper end portion of the tubular member 32.

  The molten metal discharged while turning from the upper end portion of the cylindrical member 32 moves to the “shallow portion”, and after moving to the “shallow portion”, the outer peripheral edge ( Therefore, it spreads toward the inner wall surface of the crucible 20. Then, the molten metal that has reached the outer peripheral edge of the plate-like member 31 passes through the annular gap Z, and then descends along the inner wall surface of the crucible 20 and returns to the lower part in the crucible 20. The molten metal returned to the lower part in the crucible 20 is again introduced into the cylindrical member 32 from the lower end of the cylindrical member 32. As a result, the entire molten metal stored in the crucible 20 is circulated uniformly.

  In this way, the temperature of the molten metal circulating in the crucible 20 is maintained and adjusted to an appropriate high temperature by adjusting the heating power of the burner 41. Further, the fan 42 is rotationally driven in a predetermined second rotational direction by the motor M2. Thereby, the gas in the upper space S2 is introduced to the combustion chamber S1 side.

  The amount of metal material charged into the crucible 20 is adjusted by controlling the rotation angle of the impeller 52 of the charging chute 51. In the present embodiment, the metal material is charged into the “shallow area” through the outlet 51 b of the charging chute 51.

  In this embodiment, it is an undried bulk metal material such as a briquette obtained by compressing and solidifying metal powder such as aluminum chips, and the whole is immersed when put into the “shallow part” “Small size” is put into “Shasebe”. In other words, the height difference between the plate-like member 31 and the outlet 21 is set so as not to exceed the initial size of the massive metal material. The reason why the lump-shaped metal material is added is that the surface area can be made smaller than that of the chip-like metal material and it is difficult to be oxidized.

  When such a massive metal material is introduced into the “shallow part”, the upper part of the molten metal material is melted by the molten metal while the upper part is exposed from the molten metal surface, and the volume of the molten metal is gradually reduced. Move along the flow in the “shallow section”. In this process, oil smoke and water vapor derived from oil moisture such as cutting oil adhering to the metal material are released from the portion of the massive metal material exposed from the molten metal. Therefore, it is possible to safely remove oil and moisture from the bulk metal material without performing a drying process before adding the bulk metal material.

  The massive metallic material that moves through the “shallow part” while decreasing the volume reaches the annular gap Z and stays in the vicinity of the annular gap Z until the volume is reduced to a size that can pass through the annular gap Z. That is, the width of the annular gap Z is set so as not to exceed the initial size of the massive metal material. When the volume is reduced to a size that can pass through the annular gap Z, the bulk metal material passes through the annular gap Z, and then along the flow of the molten metal circulating in the crucible 20, along the inner wall surface of the crucible 20. Going down. The lowered lump metal material is completely melted at the lower part in the crucible 20, becomes a part of the molten metal, is introduced into the tubular member 32 from the lower end of the tubular member 32, and circulates in the crucible 20.

  As described above, the oily smoke generated from the bulk metal material is discharged into the upper space S2. The oil smoke discharged into the upper space S2 is introduced into the combustion chamber S1 through the passage 17 by the rotation of the fan 42. The oil smoke introduced into the combustion chamber S1 is combusted (secondary combustion) by the burner 41 as in the case of the fuel gas. Therefore, the oil smoke can be reused as the fuel for the burner 41, so that energy efficiency is increased.

  The exhaust gas generated by the combustion in the combustion chamber S1 is discharged to the outside through the exhaust passage 14. Further, the secondary air at normal temperature is introduced into the exhaust passage 14 through the passage 15. The reason why the secondary air at normal temperature is introduced into the exhaust passage 14 is to rapidly cool the temperature of the exhaust gas so that harmful substances such as dioxins that can be generated due to the combustion of the oil smoke described above are not released to the outside. It is.

  As described above, the metal material waiting at the position of the impeller 52 is also located in the middle of the passage 17. Therefore, the waiting metal material is exposed to high-temperature oil smoke passing through the passage 17. As a result, it is possible to perform a preliminary drying process on the waiting metal material at the time before being introduced into the molten metal.

(Action / Effect)
As described above, according to the present embodiment, since the crucible 20 is heated by the thermal power of the burner 41, the inside of the crucible 20 functions as a “temperature raising chamber”. In addition, since the molten metal stored inside the crucible 20 is stirred by the screw 33a of the stirring rod 33, the inside of the crucible 20 also functions as a “melting chamber”. That is, the inside of the single crucible 20 can be used as a “heating chamber” and a “dissolving chamber”. Therefore, as compared with the “apparatus described in the literature described in the background art” in which the “heating chamber” and the “dissolution chamber” are separately provided, the entire apparatus can be made compact.

  Further, according to the present embodiment, the bulk metal material charged into the shallow portion is swung in the horizontal plane while the upper portion is exposed from the molten metal surface and melted by the molten metal to gradually reduce the volume. Move along the shallow water along the flow of the molten metal. In this process, oil smoke and water vapor derived from oil moisture such as cutting oil adhering to the metal material can be released from the portion of the bulk metal material exposed from the molten metal. Therefore, it is possible to safely remove oil and moisture from the bulk metal material without performing a drying process before adding the bulk metal material.

  Further, according to the present embodiment, the oil smoke derived from the oil component contained in the metal material is guided to the combustion chamber S1, and the oil smoke guided to the combustion chamber S1 is combusted by the burner 41 in the same manner as the fuel gas (two Next combustion). Therefore, the oil smoke can be reused as the fuel for the burner 41, so that energy efficiency is increased. In addition, it can be made harmless by completely burning oil smoke.

  Further, according to the present embodiment, the metal material that is waiting at the position of the impeller 52 of the charging chute 51 is located in the middle of the passage 17 in which high-temperature oil smoke moves from the upper space S2 to the combustion chamber S1. Therefore, a preliminary drying process can be performed on the metal material waiting at the position of the impeller 52 at a time before the charging.

  The present invention is not limited to the above-described exemplary embodiments, and various applications and modifications can be considered without departing from the object of the present invention. For example, each of the following embodiments to which the above embodiment is applied can be implemented.

  In the embodiment described above, a nonferrous metal block material such as an aluminum briquette is used as the metal material to be charged. However, an iron block material such as an iron briquette may be used. Moreover, a nonferrous metal or iron chip material may be used as a metal material to be charged. When a chip material is used as the metal material to be charged, the entire chip material can be immersed in the molten metal immediately after being charged into the molten metal, so the chip material after being subjected to a drying process is used. Is preferred.

  Moreover, in the said embodiment, although the "shallow part" is formed by providing the plate-shaped member 31, the "shallow part" does not need to be formed. In this case, even when a lump material such as briquette is used as the metal material to be charged, since the entire lump material can be immersed in the molten metal immediately after being charged into the molten metal, a drying treatment was performed. It is preferred that a later bulk material is used.

  Moreover, in the said embodiment, although the cyclic | annular clearance gap Z is formed between the outer periphery of the plate-shaped member 31, and the inner wall face of the crucible 20, it is not cyclic | annular (namely, covering the perimeter of the circumferential direction). A gap that is not continuous may be formed.

  Moreover, in the said embodiment, although the furnace body 10 which accommodates the crucible 20 is provided, the furnace body 10 does not need to be provided. That is, the entire crucible 20 may be exposed to the outside. In this case, a burner is placed in the vicinity of the outer wall of the crucible 20, and the crucible 20 can be heated by the burner. The exhaust gas generated by the burner combustion is directly discharged to the outside.

  DESCRIPTION OF SYMBOLS 10 ... Furnace body, 11 ... Bottom wall, 12 ... Side wall, 13 ... Top wall, 20 ... Crucible, 30 ... Stirring part, 31 ... Plate-shaped member, 32 ... Cylindrical member, 33 ... Stirring rod, 33a ... Screw, 40 ... heating unit, 41 ... burner, 42 ... fan, 50 ... charging unit, 51 ... charging chute, 52 ... impeller, M1, M2 ... motor

Claims (5)

A crucible that stores the molten metal for melting the metal material inside, with the top being opened,
An agitation unit that agitates the molten metal stored in the crucible and generates a flow of the molten metal inside the crucible;
A heating unit for heating the crucible;
A metal melting apparatus comprising: The metal melting apparatus according to claim 1,
The stirring unit is
In the central part of the crucible when the crucible is viewed from above, a cylindrical member arranged along the vertical direction in the molten metal stored in the crucible,
A swirl upflow generator that generates a swirl upflow that rises while swirling with respect to the molten metal located inside the tubular member;
A metal melting apparatus comprising: The metal melting apparatus according to claim 2,
The stirring unit is
A plate-like member connected to the upper end of the cylindrical member, and arranged along the horizontal direction in the molten metal stored in the crucible;
A metal melting apparatus in which a gap is formed between an outer edge of the plate-like member and an inner wall surface of the crucible. A metal melting apparatus according to any one of claims 1 to 3,
A furnace body that houses the crucible inside,
The heating unit is
A burner that heats the crucible by burning fuel gas in a combustion chamber defined by an outer wall of the crucible and a side wall and a bottom wall of the furnace body;
An oil smoke introduction section for introducing oil smoke derived from an oil component contained in the metal material, which is discharged into an upper space defined by an opening of the crucible and an upper wall of the furnace body, to the combustion chamber;
A metal melting apparatus comprising: The metal melting apparatus according to claim 4,
A charging unit for charging the metal material into the molten metal stored in the crucible;
The charging unit is configured such that the metal material waiting in the charging unit is positioned in the middle of a path through which the oil smoke moves from the upper space to the combustion chamber by the oil smoke introduction unit. Melting device.

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