JP5348975B2 - Metal melting furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a metal melting furnace capable of managing a temperature of held molten metal with high accuracy while saving energy. <P>SOLUTION: In this metal melting furnace 1 in which a melting chamber 10 and a holding chamber 20 are partitioned by a partitioning wall 2, and the molten metal produced by heating a material to be melted in the melting chamber 10 is supplied to the holding chamber 20 through a communicating section 4 formed on the partitioning wall 2, the holding chamber 20 comprises a molten metal storage gutter 24 connected to the communicating section 4, the molten metal storage gutter 24 allows the molten metal supplied from the melting chamber 10 to flow down to a lower part of the holding chamber 20 in such a state that at least a part of the communicating section 4 is retained to be buried in the molten metal. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a metal melting furnace for melting a metal material such as aluminum.

As a conventional metal melting furnace, for example, a configuration disclosed in Patent Document 1 is known. As shown in FIG. 7, in the metal melting furnace 50, a melting chamber 52 that melts the material 51 to be melted and a holding chamber 53 that stores molten metal communicate with each other via a communication portion 54. The material 51 to be melted is heated by the melting heating burner 55 in the melting chamber 52 and the generated molten metal flows into the holding chamber 53 through the communication portion 54. The holding chamber 53 is provided with a temperature riser 56, and the molten metal supplied from the communicating portion 54 is heated by the holding heating burner 57 while passing through the temperature riser 56 and is heated.
JP 2002-310571 A

  In the metal melting furnace 50 disclosed in Patent Document 1, not only the molten metal stored in the lower part of the holding chamber 53 but also the molten metal that passes through the temperature raising rod 56 is heated by the holding heating burner 57. It is possible to increase the heating efficiency of the molten metal.

  However, the molten metal in the holding chamber 53 is heated not only by the holding heating burner 57 but also by the combustion gas of the melting heating burner 55 flowing into the holding chamber 53 through the communication portion 54, and this combustion. The thermal energy of the gas varies depending on the amount of the material 51 to be dissolved in the melting chamber 52, the internal temperature, the amount of combustion of the melting heating burner 55, and the like. For this reason, the temperature of the molten metal stored in the holding chamber 53 is likely to vary, and there is room for further improvement in this respect.

  Therefore, an object of the present invention is to provide a metal melting furnace capable of accurately controlling the temperature of the molten metal to be held while saving energy.

  The object of the present invention is such that the melting chamber and the holding chamber are partitioned by a partition, and the molten metal generated in the melting chamber is supplied to the holding chamber through a communication portion formed in the partition. The holding chamber is provided with a hot water tank connected to the communication part, and the hot water tank has the molten metal supplied from the melting chamber, and at least a part of the communication part is in the molten metal. This is achieved by a metal melting furnace that flows down to the lower part of the holding chamber in a state of being stored so as to be buried.

  In this metal melting furnace, the melting chamber and the holding chamber can have heating means for heating each chamber individually.

  Further, the hot water storage tank has a U-shaped cross section, and can have a notch at the end opposite to the side connected to the communication port.

  In addition, a preheating chamber can be further provided that is disposed adjacent to the melting chamber in the horizontal direction so as to communicate with the melting chamber and into which a material to be melted can be charged.

  According to the metal melting furnace of the present invention, the temperature control of the molten metal to be held can be accurately performed while saving energy.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a cross-sectional perspective view of a metal melting furnace according to an embodiment of the present invention.

  As shown in FIG. 1, the metal melting furnace 1 is configured such that a melting chamber 10 and a holding chamber 20 are partitioned by a partition wall 2, and the melting chamber 10 and the holding chamber 20 are communicated with each other below the partition wall 2. A communicating portion 4 is formed.

  The melting chamber 10 includes a melting burner 12 that heats and melts a material to be melted such as an aluminum ingot and has a bottom surface that is an inclined surface 10 a that descends toward the communicating portion 4. As the melting burner 12, various heating means for heating the material to be melted can be used. For example, a regenerative burner including a pair of regenerative radiant tube burners can be preferably used, and combustion of one burner can be performed. When the combustion gas is discharged from the other burner, the heat recovery of the combustion gas can be performed in the heat storage body. In addition, a work port 14 that can be opened and closed is provided on the inner wall surface of the melting chamber 10, and work and inspection in the melting chamber 10 can be performed through the work port 14.

  Although the communicating part 4 is formed in a slit shape in the present embodiment, it may be a through hole, and preferably has a size that does not flow down to the holding chamber 20 while the material to be dissolved remains solid. Moreover, the slit and the through-hole which comprise the communication part 4 may be formed not only in a single thing but in multiple places.

  The holding chamber 20 is provided with a holding burner 22 at the top, and a hot water tank 24 connected to the communication part 4 is disposed immediately below the holding burner 22. The hot water storage tank 24 has a U-shaped cross section as shown in FIG. 2 (a), and has a notch 24a at the end opposite to the side connected to the communication part 4 as shown in FIG. 2 (b). Are formed so as to extend in the horizontal direction from the communication portion 4. The cutout portion 24 a functions as a main lower part of the molten metal that passes through the hot water tank 24, and the lower edge L 1 of the cutout portion 24 a is formed at a position above the upper edge U 1 of the communication portion 4.

  A tap hole 26 is formed in the lower portion of the holding chamber 20, and the molten metal stored in the lower portion of the holding chamber 20 can be discharged through the tap hole 26 by removing the tap 26 a. A work port 28 that can be opened and closed is provided on the inner wall surface of the holding chamber 20, and work and inspection in the holding chamber 20 can be performed through the work port 28.

  Moreover, the preheating chamber 30 is connected to the melting chamber 10 so that the inside communicates without a step, and the preheating chamber 30, the melting chamber 10, and the holding chamber 20 are adjacent in the horizontal direction in this order. On the side surface of the preheating chamber 30, an openable and closable material input port 32 for supplying a material to be melted is provided.

  According to the metal melting furnace 1 having the above configuration, first, the material to be melted is charged through the material charging port 32 of the preheating chamber 30. Since the preheating chamber 30 of the present embodiment is disposed adjacent to the melting chamber 10 in the horizontal direction, there is no need to lift the material to be melted at the time of charging the material to be melted, and the work load for material charging is reduced. In addition, even when a regenerative burner 12 is used as the melting burner 12, the heat of combustion of the melting burner 12 can be easily transmitted to the preheating chamber 30, and the material to be melted can be preheated using heating means with high thermal efficiency. It can be done efficiently.

  However, the arrangement of the preheating chamber 30 is not necessarily limited to that of the present embodiment, and the preheating chamber 30 may be provided above the melting chamber 10 as in a conventional preheating tower. In this case, it is preferable that the combustion gas in the melting burner 12 is discharged from the upper portion of the preheating chamber 30 and the material to be dissolved in the preheating chamber 30 is preheated with the combustion gas.

  The material to be melted preheated in the preheating chamber 30 moves to the melting chamber 10 as a new material to be melted is charged, and is heated and melted by the melting burner 12. The molten metal thus generated in the melting chamber 10 flows toward the communicating portion 4 along the inclined surface 10a, and flows down to the lower portion of the holding chamber 20 through the hot water tank 24.

  In the hot water tank 24, the molten metal can be temporarily stored, and the molten metal in the hot water tank 24 is heated from the entire circumference by the combustion flame or combustion gas of the holding burner 22 that is higher than the molten metal temperature. As a result, the molten metal in the holding chamber 20 can be efficiently heated, and the molten metal stored in the holding chamber 20 can be easily raised to a desired temperature. In this embodiment, the notch 24a is formed at the front end side of the hot water tank 24, and the molten metal flows down mainly from the notched part 24a. Therefore, it is possible to ensure a sufficient residence time of the molten metal in the hot water tank 24. It is possible to enhance the energy saving effect.

  In the hot water tank 24, as shown in FIG. 3, since the molten metal M is stored up to the same height as the lower edge L1 of the notch 24a, the upper edge U1 of the communication part 4 is more than the liquid level of the stored molten metal M. The communication part 4 is buried in the molten metal M. Accordingly, the flow of the combustion gas between the melting chamber 10 and the holding chamber 20 is interrupted, so that the melting chamber 10 and the holding chamber 20 are individually heated by the melting burner 12 and the holding burner 22. That is, since the temperature of the molten metal stored in the holding chamber 20 is not affected by the heating state in the melting chamber 10, the temperature control of the molten metal in the holding chamber 20 can be accurately performed, and the temperature is accurately adjusted to the temperature suitable for the hot water. Can be maintained. In addition, since the temperature control in the melting chamber 10 can be performed with high accuracy, for example, when the material to be melted is a composite material such as aluminum and iron, the aluminum and iron can be separated and recovered accurately. .

  As shown in FIG. 3, it is preferable that a space S is always formed between the molten metal M stored in the lower part of the holding chamber 20 and the lower surface of the hot water tank 24, and the combustion flame and combustion of the holding burner 22. By passing through the space S, the gas heats the molten metal M stored in the hot water tank 24 from the entire circumference, and can efficiently raise the temperature to a temperature close to the holding temperature. The molten metal flowing down from the hot water tank 24 and stored in the holding chamber 20 is discharged to the outside through a discharge port (not shown). In addition, about the molten metal stored in the hot water tank 24, when it is finally necessary to drain the remaining hot water, a part of the side wall of the front end of the hot water tank 24 can be configured to be detachable, or the bottom of the hot water tank 24 can be attached. A heat-resistant sealing plug may be provided.

  The shape and length of the hot water storage tank 24 are not particularly limited as long as the communication portion 4 can be buried in the stored molten metal and the flow of the combustion gas between the melting chamber 10 and the holding chamber 20 can be blocked. For example, as shown in FIG. 4A, the bottom surface of the hot water tank 24 is formed so as to extend upward from the communication part 4, and the upper side edge U2 of the hot water tank 24 is higher than the upper edge U1 of the communication part 4. You may comprise so that it may become. Moreover, the hot water tank 24 does not need to be formed over the entire holding chamber 20 up to the inner wall surface facing the partition wall 2, and may be provided only in a part of the holding chamber 20 as shown in FIG. .

  Moreover, it is preferable that the hot water storage tank 24 is formed in a U-shaped cross section as in the present embodiment so as to be easily heated from the holding burner 22. Here, the U shape is not limited to the shape in which the bottom of the hot water tank 24 is curved as long as the upper side is open, and is a concept including, for example, a shape having a flat bottom (that is, a U-shaped cross section). . However, the shape of the hot water tank 24 is not limited to a U-shaped cross section, and may be formed in a tubular shape, for example. The hot water storage tank 24 of the present embodiment has a shape that extends linearly toward the inner wall surface of the holding chamber 20 that faces the communication portion 4, but may have a shape that curves in a waveform, and further, It may be a shape that expands in the width direction, such as an elliptical shape. The arrangement of the hot water tank 24 is preferably directly below the holding burner 22, but other arrangements are possible, for example, the hot water tank 24 can be provided in the holding chamber 20 provided with the holding burner 22 on the side surface. is there.

  Moreover, as shown in FIG. 5, only a part of the communication part 4 may be buried in the stored molten metal as long as the flow of the combustion gas is blocked.

  In each of the above embodiments, since the molten metal is stored in the hot water tank 24, the molten metal is also stored at the bottom of the melting chamber 10, so that the material to be melted is shut off from the air in the stored molten metal. It can melt | dissolve and can suppress the oxidation of a to-be-dissolved material. In order to further increase the amount of molten metal stored in the melting chamber 10, as shown in FIG. 6, a hot water reservoir 10b capable of storing the molten metal may be formed in the vicinity of the communication portion 4 on the bottom surface 10a of the melting chamber 10. . According to this configuration, in addition to the above effects, the hot water tank 24 can be reliably prevented from being damaged due to the material to be melted falling into the holding chamber 20.

It is a section perspective view of the metal melting furnace concerning one embodiment of the present invention. It is (a) sectional drawing and (b) side view which show the principal part of the metal melting furnace shown in FIG. It is principal part sectional drawing of the metal melting furnace shown in FIG. It is principal part sectional drawing of the metal melting furnace which concerns on other embodiment of this invention. It is principal part sectional drawing of the metal melting furnace which concerns on other embodiment of this invention. It is principal part sectional drawing of the metal melting furnace which concerns on other embodiment of this invention. It is sectional drawing of the conventional metal melting furnace.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Metal melting furnace 2 Bulkhead 4 Communication part 10 Melting chamber 12 Melting burner 20 Holding chamber 22 Holding burner 24 Hot water storage tank 24a Notch 30 Preheating chamber

Claims (4)

The melting chamber and the holding chamber are partitioned by a partition, and the molten metal generated by heating the material to be melted in the melting chamber is supplied to the holding chamber through a communication portion formed in the partition. A furnace,
The holding chamber includes a hot water tank connected to the communication portion,
The hot water tank is a metal melting furnace that causes the molten metal supplied from the melting chamber to flow down to the lower part of the holding chamber in a state where at least a part of the communication portion is stored in the molten metal. The metal melting furnace according to claim 1, wherein the melting chamber and the holding chamber have heating means for heating each chamber individually. 3. The metal melting furnace according to claim 1, wherein the hot water tank has a U-shaped cross section and has a notch at an end opposite to the side connected to the communication port. The metal melting furnace according to any one of claims 1 to 3, further comprising a preheating chamber that is disposed adjacent to the melting chamber in a horizontal direction so as to communicate with the melting chamber and into which a material to be melted can be charged.

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