JPH06288678A - Melting furnace and melting plant - Google Patents

Abstract

PURPOSE:To freely arrange an operation style after a reproduction processing at a melting furnace, and to enhance the efficiency of a whole melting furnace by forming a molten steel discharge port and a molten steel suction port in such a manner that they may be opposed to each other. CONSTITUTION:An aluminum chip fed into a stoke 2 is swiftly brought into a molten steel with an agitation blade 3 without floating on the surface of the molten steel. The molten steel which includes the aluminum chip is carried over to a surrounding area outside the stoke 2 by convection and heated with a burner 5 so that is may be melted as required. Since the aluminum chip is kept off from direct contact with the flames of the burner 2 during this melting operation, it is not oxidized. When manufacturing an ingot, the molten steel is dipped out with a dip out pot from a molten steel dip out opening 7 and poured into a casting mold of an ingot conveyer one after another. It is also possible to take out the molten steel from the molten steel discharge port 6 into a ladle in the lower part by operating a furnace body tilting device. This construction make it possible to provide flexibility to a melting furnace.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a melting furnace used for reclaiming light alloy chips generated as scrap and melting equipment using the melting furnace.

[0002]

2. Description of the Related Art In recent years, from the viewpoint of resource saving, attempts have been made to melt and recycle and utilize light alloy chips that are generated as scraps during processing such as cutting.

The melting furnace for regenerating the light alloy chips includes a reverberatory furnace system in which the surface of the molten metal is directly heated by a heating burner, an electromagnetic induction furnace for melting by utilizing electromagnetic induction,
There are various types of furnaces, such as a low-frequency induction furnace that melts using low frequencies and a crucible furnace that heats from the bottom of the crucible with a heating burner.

Each of the above-mentioned furnaces has merits and demerits in terms of fuel consumption for melting, yield, initial cost of equipment, running cost, etc., and any one of the above can be selected depending on the melting capacity, site conditions, use, etc. The present situation is that such a melting furnace is used.

By the way, when regenerating a light alloy chip generated by machining such as cutting, whether the regeneration is economically viable or not is that "fuel efficiency" and "yield", which represent the efficiency of melting itself, are high. Of course, the process (work) before and after the melting furnace
That is, it is required to have a high overall efficiency in supplying light alloy chips to the melting furnace or in the entire regeneration treatment of the molten metal melted in the melting furnace.

[0006]

However, in the conventional melting furnace, as shown in FIG. 8, a ladle placed below the tap opening 6 ', which is openable and closable, provided on the lower side of the furnace ( The molten metal is taken out into a casting place at a separate place (not shown) and cast into a desired casting place, where it is cast into a desired mold or an ingot which is an intermediate product. Further, as another form, a hot water distribution path to the mold is formed below the tap hole of the melting furnace, and the molten metal is directly poured into the mold.

In any of the above cases, only the prescribed form of treatment can be performed, and in such a case, the form after the regeneration treatment in the melting furnace is specified and flexibility is lost, and the melting equipment Overall efficiency is low.

The present invention has been made in view of the above situation, and a melting furnace and its melting furnace in which the form after the regeneration treatment in the melting furnace can be freely set and the efficiency of the entire melting equipment can be increased. The object is to provide a melting facility utilizing

[0009]

In a melting furnace according to the present invention, a light alloy chip is put into the molten metal in the furnace, and
In a melting furnace configured to heat the molten metal with an attached heating means, a molten metal discharge port for inclining the melting furnace to take out the molten metal on the outer periphery of the melting furnace, and pumping it out to the outside with a scooping container such as a ladle And a molten metal pumping port whose upper surface is opened so as to enable the above.

Further, in the melting equipment according to the present invention, the light alloy chips of the supplied raw material are pretreated and supplied to the melting furnace, and the melting equipment is melted and regenerated in the melting furnace. A melt body discharge port for inclining the melt and a melt pumping port with an open upper surface are provided at opposite portions of the outer periphery of the melt furnace, and furnace body tilting means for tilting the melt furnace is provided on the melt discharge port side. A ladle arrangement portion or a hot water distribution path to the mold is provided below the molten metal discharge port of the melting furnace, and an operating arm having a scooping container such as a ladle at the tip near the molten metal pumping port of the melting furnace and this pumping It is characterized in that a pumping robot equipped with an operating means for transporting the container from the molten metal pumping port to a predetermined mold is arranged.

[0011]

According to the melting furnace of the present invention, however, if necessary, for example, when molten metal is required at a separate casting site, the melting furnace is tilted and taken out from the molten metal discharge port to the ladle. In addition, when pouring in the vicinity of the furnace, the melting furnace can be left as it is and it can be pumped out from the molten metal pumping port using a pumping container such as a ladle. Even if the melting furnace is tilted when the molten metal is taken out from the molten metal discharge port as described above, the molten metal pumping port is formed at the outer peripheral portions facing each other of the melting furnace, so that the molten metal is discharged from the molten metal pumping port. It will not be leaked unnecessarily.

According to the melting equipment of the present invention,
The light alloy chips supplied from the supply hopper are pretreated and then melted in the melting furnace to become molten metal, and this molten metal is tilted from the molten metal discharge port by tilting the melting furnace using the furnace tilting means, if necessary. Can be taken out of the ladle placed in the ladle placement section or into the mold via the hot water distribution channel, or with the melting furnace left as it is (without tilting), pumping out a ladle etc. from the molten metal pumping port. With a pumping robot having a container, it can be taken out into a desired mold with almost no human intervention.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a partially sectional plan view showing the structure of a melting furnace for a light alloy chip (aluminum in this embodiment) according to an embodiment of the present invention, FIG. 2 is a front sectional view of FIG. 1, and FIG. FIG. 3 is a side view of FIG. 1.

1 to 3, A is a melting furnace, 1 is a melting furnace main body whose base is formed in a circular shape in plan view, 2 is a stalk (cylindrical body) in which the inside is an aluminum chip inlet 2b, 3 Is a stirring blade, 4 is a drive shaft for rotating the stirring blade 3, 5
Is a heating burner, 6 is a ladle with the melting furnace body tilted (Fig. 4).
A beak-shaped molten metal discharge port whose tip and upper part are open, and a molten metal discharge port 7 having an open upper surface for discharging to the outside with a ladle-shaped pumping container.

As shown in FIG. 1, the molten metal outlet 6
The molten metal pumping port 7 is formed at a position facing the outer peripheral portion of the melting furnace main body 1, that is, facing the outer peripheral portion of the melting furnace main body 1 across the stalk 2.

Further, the melting furnace A of this embodiment is a furnace tilting device having a known mechanism (not shown), for example, a hydraulic cylinder pivotally attached to one side of the melting furnace A and the other side of the hydraulic cylinder. As shown by a two-dot chain line L in FIG. 2, the tilt center axis of the left end (through the furnace body tilting device formed of the tilt center axis formed at the portion separated from the cylinder (the left end of the melting furnace A in FIG. 2) ( The melting furnace body 1 is configured to be tiltable to the left by an angle θ around a center (not shown).

In the melting furnace A according to this embodiment, the stalk 2 is concentrically arranged at the center of the base of the melting furnace main body 1, and the lower end thereof is the molten metal during the melting operation as shown in FIG. It is arranged so as to be immersed therein. The stalk 2 is formed of a heat-resistant material, and is formed so that the flange portion 2a is fitted and fitted into the stalk mounting hole in the center of the melting furnace body 1.

Further, as shown in FIG. 1, the stirring blade 3 is concentric with the center of the stalk 2, and as shown in FIG. 2, the upper end of the stirring blade 3 is lower than the lower end of the stalk 2. It is arranged so as to be located slightly below and the upper end of the stirring blade 3 is located below the molten metal surface S by 50 to 150 mm, preferably about 100 mm below. The stirring blade 3 has a predetermined rotation speed (about 100 in this embodiment).
(~ 350 rpm), the radius of the vortex formed by stirring the molten metal is set to be equal to the diameter of the stalk 2, and the stirring blade 3 is rotated a predetermined amount so that the molten metal is stirred. Around the circumference 3, a flow is formed so as to go from the upper side to the lower side. The rotation is configured to be performed by the prime mover (electric motor or the like) at the upper end (not shown) via the drive shaft 4. The drive shaft 4 is configured so that the vertical position in the molten metal of the stirring blade 3 can be adjusted according to the liquid level of the molten metal by a lifting device for the stirring blade 3 not shown.

Further, as shown in FIG. 1 or 2, the height of the wall 1a of the melting furnace main body 1 is stoke 2 in terms of height.
The flame injection port 5a
The heating burner 5 is arranged so that the heat burner 5 faces the melt surface S side. Therefore, this heating burner 5
It will be located outside. Also, this heating burner 5
In the present embodiment, the one having a performance of injecting a flame whose flame length is long enough to go around the outer peripheral region of the stalk 2 is used. As shown in FIG. 1, the wall surface 1a of the melting furnace main body 1 has an impurity outlet 8 for discharging impurities (slag) accumulated on the surface S of the molten metal during melting to the outside. It is provided in two places across. Further, a discharge port 9 (see FIG. 2) used when discharging all the molten metal is formed in the lower portion of the melting furnace main body 1.

In the melting furnace A, the plane layout of FIG. 4 and the view taken along the line II of FIG. 5, the view taken along the line II-II of FIG. 6, and the view taken along the line III-III of FIG. 7, in order to supply aluminum chips to the melting furnace A and process the molten metal from the melting furnace A, a raw material supply hopper B, a scraper conveyor C, a crusher D, a centrifuge E, and a screw conveyor F. , A chamber G, a rotary kiln H, a scraper conveyor I, a supply chute M, a pumping robot J, and an ingot conveyor K are organically arranged.

That is, the raw material supply hopper B is a device for charging a chip-shaped aluminum raw material (aluminum chip), and as shown in FIG. 4 or 5, the upper part is formed in a funnel shape, and the funnel shape. At the bottom, a screw conveyor B that discharges aluminum chips to the scraper conveyor C side
₁ is placed. In addition, the scraper conveyor C
The base end is connected to the tip of the screw conveyor B ₁ of the raw material supply hopper B, and the front end is connected to the supply section D ₁ of the crusher D to convey the aluminum chips from the raw material supply hopper B to the crusher D. Is configured to. The crusher D has a well-known crushing mechanism, and crushes aluminum chips of various sizes supplied from the supply unit D ₁ on the upper side into chips of a predetermined size and discharges it from the discharge unit D _{2 on the} lower side. , The supply port E of the centrifuge E
It is configured to discharge to ₁ . Also, the centrifuge E
Separates and removes water and oil adhering to the peripheral portion of the aluminum chip crushed to the predetermined size, and discharges it from the chute E ₂ provided below to the supply port F ₁ of the screw conveyor F below the chute E _2. Is configured to. Then, as shown in FIG. 4 or FIG.
Has a tip penetrating through the chamber G and extending into the rotary kiln H. Also, at the tip of the rotary kiln H,
The heating burner H ₁ is arranged such that the injection port faces the base end side, and the rotary kiln H is provided with a rotating drum H _{2 which} is inclined downwardly on the tip end side. The tip is the rotary drum H ₂ of this rotary kiln H.
It is configured to pass through hot air from the base end to the tip. Further, in the lower part of the tip of the rotary kiln H,
A discharge port H ₃ for discharging the aluminum chips is formed above the supply port I ₁ of the scraper conveyor I.
Further, the scraper conveyor I is shown in FIG.
As shown in FIG. 2, the supply port I ₁ located at the base end,
A discharge port I ₂ is provided at the tip rising from the base end side, and this discharge port I ₂ is the hopper portion M of the supply chute M.
₁ It is configured to be located above. Further, the supply chute conveyor M is provided with the above-mentioned hopper M ₁ on the upper level, and is also provided with a chute M ₂ whose tip extends from the hopper M ₁ to the inside of the stalk 2 of the melting furnace A.

Further, as shown in FIG. 4, in the vicinity of the melting furnace A, a ladle-shaped pumping-out container J is provided at the tip.
A working arm J ₁ (refer to a chain line) for moving ₂ from the molten metal pumping port 7 position of the melting furnace A to the base end position of the ingot conveyor K is provided, and the molten metal is pumped out of the melting furnace A into the mold k of the ingot conveyor K. A pumping robot J is provided. And, in the ingot conveyor K,
Ingot molds k are arranged in parallel on the transfer surface,
The tact operation is performed in synchronization with the pouring operation of the pumping robot J.

In the present embodiment, a ladle arranging portion (a portion where the ladle 10 is arranged) for arranging the ladle 10 thereabove is formed below the molten metal discharge port 6 of the melting furnace A. ing.

Therefore, the melting furnace A and the melting equipment according to the present embodiment configured as described above operate as follows in the melting process of the aluminum chips.

That is, as shown in FIGS. 4 to 7, when an aluminum chip is put into the supply hopper B, it is conveyed from the supply hopper B to the crusher D by the scraper conveyor C, and then the desired size is obtained. Crushed into chips, and then the centrifugal separator E below the crusher D removes oil, water, etc. adhering to the aluminum chips. Then, the aluminum chips from which oil or water has been removed in this way are discharged from the chute E _{2 of the} centrifuge E to the screw conveyor F side, pass through the chamber G by the screw conveyor F, and enter the rotary kiln H. After being loaded, the aluminum chips are dried and preheated in the rotary kiln H. Then, the aluminum chips thus processed for melting are conveyed to the supply chute M by the scraper conveyor I, and are supplied into the stalk 2 of the melting furnace A by the supply chute M.

In the lower part of the stalk 2 of the melting furnace A, the stirring blade 3 forms a flow of molten metal from the upper side to the lower side as shown by an arrow R in FIG. The removed aluminum chips are quickly drawn into the molten metal without floating on the surface. Then, the molten metal containing the aluminum chips is conveyed along the convection (see arrow R in FIG. 2) around the outside of the stalk 2 of the melting furnace main body 1,
The desired melting is performed by being heated by the heating burner 5 here. In this melting furnace A,
The aluminum chips are supplied into the stalk 2 and do not come into direct contact with the flame of the heating burner 5, so they do not oxidize, and thus high yield and fuel consumption can be obtained.

The aluminum chip melted in a predetermined state as described above is used to manufacture an ingot, as shown in FIG. 4, as shown in FIG.
Then, a desired aluminum ingot is completed by being sequentially poured into the mold k of the ingot conveyor K, which is pumped out by the pumping robot J, and is synchronized with the pouring operation of the pumping robot J, and which is in tact operation.

When attempting to take out the molten metal into the ladle 10, the furnace inclining device (not shown) is operated to tilt the melting furnace A within the range of the angle θ as shown by the chain double-dashed line in FIG. It can be taken out from the outlet 6 into the ladle 10 below it.

As described above, according to the melting furnace according to the present embodiment, when the ingot is taken out to the mold k and the ladle 10 is taken out, it is possible to
By operating the pumping robot J or the furnace body tilting device of the melting furnace, the molten metal can be selectively taken out from the molten metal pumping port 7 or the molten metal discharge port 6.
Therefore, the melting furnace becomes very flexible. Furthermore, since this melting furnace melts the aluminum chips that are put inside the stalk as described above, extremely efficient heat transfer and convection of the molten metal that makes the temperature of the molten metal in each part uniform are generated in the melting furnace. As a result, the melting operation of the aluminum chip can be performed very smoothly and with a small amount of heat energy.

Further, according to the melting equipment of the present embodiment, the aluminum chips are simply put into the supply hopper, and after that, the aluminum chips suitable for the melting process are fixed in the melting furnace without human intervention. Since it can be supplied in units of quantity, it can be taken out as a molten metal for an aluminum ingot or in a molten state in a ladle. As a result, the present melting equipment can process a large amount of aluminum chips per unit time without requiring a lot of manpower, and the required thermal energy is low and a high yield can be obtained. It becomes the high equipment.

By the way, in the above embodiment, when the melting furnace is close to the mold, a hot water distribution passage communicating with the mold may be formed instead of the ladle arrangement portion.

In the present embodiment, the case of aluminum chips was explained exclusively, but it goes without saying that the same can be applied to the case of other light alloy chips.

[0034]

As described above, according to the melting furnace for aluminum chips of the present invention, it is possible to provide a melting furnace having high flexibility which can be directly poured into a mold for an ingot or taken out as a molten metal from a ladle. it can.

Further, according to the melting equipment of the present invention, since it is possible to provide a highly efficient melting equipment as a whole as described above, it is more difficult to recycle the light alloy chips as scrap, which has been difficult in terms of cost. It will be easier and will contribute to resource saving in today's demand for resource saving.

[Brief description of drawings]

FIG. 1 is a partially sectional plan view showing the structure of a melting furnace for a light alloy chip according to an embodiment of the present invention.

FIG. 2 is a front sectional view showing a configuration of a melting furnace for the light alloy chip of FIG.

FIG. 3 is a side view showing a configuration of a melting furnace for the light alloy chip of FIG.

FIG. 4 is a plan layout view showing the melting furnace of FIG. 1 and devices around the melting furnace.

5 is a view on arrow I-I of FIG. 4. FIG.

FIG. 6 is a view taken along the line II-II in FIG.

FIG. 7 is a view taken along the line III-III in FIG.

FIG. 8 is a front sectional view showing the structure of a conventional reverberatory furnace melting furnace.

[Explanation of symbols]

A ... Melting furnace 6 ... Molten metal discharge port 7 ... Molten metal pumping port J ... Pumping robot J ₁ ... Working arm

Claims (2)

[Claims] 1. A melting furnace configured to put a light alloy chip into the molten metal in the furnace and heat the molten metal by an attached heating means, wherein the melting furnace is inclined to the outer peripheral portion of the melting furnace. A melting furnace characterized in that a molten metal discharge port for taking out the molten metal and a molten metal pumping port having an open upper surface so that the molten metal can be pumped to the outside by a pumping container such as a ladle are opposed to each other. 2. A melting facility in which a light alloy chip of a supplied raw material is pretreated and supplied to a melting furnace to be melted and regenerated in the melting furnace, wherein the melting furnaces face each other on an outer peripheral portion of the melting furnace. The molten metal discharge port of the melting furnace is provided with a molten metal discharge port for inclining the molten metal to incline the portion and a molten metal pumping port with an open upper surface, and furnace body tilting means for tilting the melting furnace on the molten metal discharge port side. A hot water passage to the ladle arrangement part or the mold is provided below the outlet, and in the vicinity of the molten metal pumping port of the melting furnace,
Dissolution equipment characterized by having a pumping container such as a ladle at the tip and having a pumping robot equipped with an operating arm for transporting this container from the molten metal pumping port to a predetermined mold.