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(11) | EP 1 334 324 B1 |
| (12) | EUROPEAN PATENT SPECIFICATION |
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| (54) |
MELTING FURNACE FOR METAL LEAGUES FIT TO THE DIRECT AND CONTINUOUS POURED OF THE MELTED METAL SCHMELZOFEN FÜR METALL ZUM DIREKTEN UND KONTINUIERLICHEM ABGIESSEN FOUR DE FUSION POUR CHARGES METALLIQUES ADAPTE AU COULAGE DIRECT ET CONTINU DE METAL EN FUSION |
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| Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention). |
[0001] Melting furnace for metal leagues fit to the direct and continuous pouring of the melted metal.
Technical field
[0002] The present invention concerns a furnace system for metal leagues of second melting with a special type of connection between the primary parts of the furnace system, the cupola and the waiting basin especially conformed and able to rotate, so as to realize a combined production system without interruption to the cycle of work.
State of the technique
[0003] In the systems of traditional foundry technology, three phases of making of the foundry cycle can be individualized tied to the three primary elements: the melting furnace, the pouring channel or the pouring channels and the waiting basin.
[0004] The first phase is constituted by the loading, in the melting furnace or cupola, of the league scrap and its melting. During this phase it is necessary to provide a large quantity of caloric energy sufficient to produce the necessary specific heat to melt the material and a further quantity of energy, latent heat, necessary to maintain the liquid phase of the metal in the time that is completed the melting of the whole scrap charge present in the cupola. The second phase consists of blowing of the furnace and consequent partial cooling to allow the pouring of the melted material, by means of special pouring channels, toward the waiting basin. The pouring channels are generally open runs that provide further cooling of the melted metal. The third and last phase is constituted by the transformation of the material in league in the waiting basin with corrections and additions of metal as well as addition reinstatement of the caloric energy, constituent the specific and latent heat, necessary to make up for dissipated energy during the inevitable cooling that prior to and during the second phase. The long melting times and pouring times of this technique, they favor the absorption of remarkable quantity of gas of the melted material, much is that in the basin it is often had to also apply to a type of correction that foresaw the addition in the bath, through injection of liquid nitrogen, to degasify the league so that to get ingots and pigs exempted by defects.
Purposes and aims of the invention
[0005] Purpose of the present invention is to eliminate the inconveniences in the preceding technique by realizing a furnace system that, with a special connection, allows the pouring in a direct and continuous way of the melted metal from the cupola to the waiting basin which is able to rotate, and from this to the ingot mould, decreasing the energy costs, management and labour time and, at the same time, also to achieve good safety conditions because the employees are not to contact with the melted material since the making cycle happens, in practice, completely in a closed environment.
[0006] The continuous making cycle avoids, therefore, the interruptions, for the blowing and the cooling of the first part of the furnace with least supply, in the second part, of further caloric energy assuring, therefore, the saving of fuel, time and hand of work.
Description of the drawings and way of realizing the invention.
[0007]
The fig. 1 shows in schematic way a lateral view in section of the furnace system;
the fig. 2 shows in schematic way a view from the top and in section of the furnace system;
the fig. 3 shows in schematic way the rotating connection channel.
[0008] In the actual form preferred of the present invention and with reference to the attached figures is pointed out with (1) the cupola essentially of cubic form with walls in material refractory (2) surrounded by a metal jacket (3), in which is present on a side the burner (4), on another side the loading door (5) and on the opposite side, centrally in low position, an opening (6) from which the melted metal escapes for reaching, through the pouring channel (7), the waiting basin of spherical form (8) that is placed on a lower plan, in a pit (9), sustained by supporting elements (10). The pouring channel (7) realizes a special rotating joint, between the cupola (1) and the waiting basin (8), constituted by two hollow cylindrical bodies of circular section, adequately heat insulated (11,12), fixed each for an extremity (13,14) respectively to the cupola (1) and to the waiting basin (8) and the other free extremity of each (15,16), coaxially inserted one in the other. Between the two cylindrical bodies (11,12) there is an inter distance of no more than some centimeter in mode so that inside can rotate without causing friction in comparison to that outside.
[0009] The waiting basin of spherical form (8) is constituted by two hemispheres set one on the other, with walls in refractory (17) and heat insulated (18) surrounded by a metallic jacket (19) and positioned in a pit (9) sustained by supports (10) in such way that his meridian circumference is practically to the same height of the pouring channel (7). In proximity of the meridian circumference are placed a burner (20) and the exit orifice (21) of the liquid metal.
[0010] The metal scrap a melted time in the cupola, it comes out from the opening (6) and through the pouring channel (7) reaches the spherical waiting basin (8), here it undergoes further treatment, and at the end when the desired result is reached, through a motorized mechanism the spherical waiting basin (8) is rotated around the axle I (what as is seen in fig. 2 it is the longitudinal central axle of the furnace system), so much that the liquid metal comes out from the exit orifice (21) to reach the ingot mould.
[0012] In fact, in virtue of the thermodynamic and physical principles of the isotropy, the particular adopted geometric form (spherical body) of the waiting basin, it exalts and improves the whole procedure of the technological cycle of production. Besides thanks to the particular connection realized between the cupola and the waiting basin of the furnace system, (although separate, they result, in the operation, united to means of the rotating joint), the said constituent parts can work in contemporary realizing, so, a continuous melting system with notable saving of fuel, of time and hand of work; they got, therefore, economies with percentages also of the fifty percent in comparison to the standards of the systems of the preceding technique.
1. Furnace system for leagues of metal of second melting comprising a cupola, a pouring
channel and a waiting basin of spherical form characterized by the fact that the pouring channel for the liquid metal with a rotating joint (7),
from the cupola (1) to the waiting basin of spherical form (8), is constituted by
two hollow cylindrical bodies of circular section (11,12), adequately heat insulated,
fixed each for an extremity (13,14) respectively to the cupola (1) and to the waiting
basin (8) and the other free extremity of each (15,16) coaxially inserted one in the
other, and through an motorized mechanism, the waiting basin (8) can rotate around
the longitudinal axle I of the furnace system, allowing the going out direct and continuous
of the melted metal by the exit orifice (21) and the filling of the ingot mould.
2. Furnace system for leagues of metal of second melting as to claim 1) characterized by the cupola (1) essentially of cubic form with walls in material refractory (2) surrounded
by a metal jacket (3), in which is present on a side the burner (4), on another side
the loading door (5), and on the opposite side of the loading door, centrally in low
position, an opening (6) from which the melted metal escapes for reaching, through
the pouring channel (7), the waiting basin of spherical form (8).
3. Furnace system for leagues of metal of second melting as to claim 1) characterized by the fact that the pouring channel (7) realizes a rotating joint between the cupola
(1) and the waiting basin (8) and that between the two cylindrical bodies (11,12),
there is an inter distance of no more than some centimeter in mode so that inside
can rotate without causing friction in comparison to that outside.
4. Furnace system for leagues of metal of second melting as to claim 1) characterized from the fact that the waiting basin of spherical form (8) is constituted by two
hollow hemispheres set one on the other, with walls in refractory (17) and heat insulating
(18) surrounded by a metallic jacket (19) and is partially positioned in a pit (9)
sustained by supports (10) in such way that his meridian circumference is practically
to the same height of the pouring channel (7).
5. Furnace system for leagues of metal of second melting as to claim 1) and 4) characterized by the fact that in proximity of the meridian circumference of the spherical waiting
basin (8) are placed a burner (20) and the exit orifice (21) of the liquid metal
1. Ofensystem für Ligen des Metalls des zweiten Schmelzens, eine Kuppel, eine strömende
Führung und ein Wartebassin von der kugelförmigen Form enthalten, gekennzeichnet durch die Tatsache, daß die strömende Führung für das flüssige Metall mit einer drehenden
Verbindung (7), von der Kuppel (1) zum Wartebassin kugelförmiger Form (8), durch zwei hohle zylinderförmige Körper kreisförmigen Abschnitt (11) festgesetzt wird und
(12), ausreichend Hitze isoliert, befestigte jedes für eine Extremität (13) und (14)
beziehungsweise zur Kuppel (1) und am Wartebassin (8) und an der anderen freien Extremität
jedem von (15) und von (16) koaxial eingesetzt eine in der anderen und durch eine motorisierte Einheit, das Wartebassin (8) kann um die Längswelle I des Ofensystems
sich drehen und das Erlöschen erlauben direkt und ununterbrochen vom geschmolzenen
Metall durch die Ausgangsöffnung (21) und die Füllung der Blockform.
2. kennzeichnete Ofensystem für Ligen des Metalls des zweiten Schmelzens hinsichtlich
Anspruches 1) durch die Kuppel (1) im Wesentlichen der Kubikform mit den Wänden in
materiellem refraktärem (2) umgeben durch eine Metalljacke (3), in der auf einer Seite
der Brenner (4), auf einer anderen Seite die Eingabetür (5) und auf der gegenüberliegenden
Seite der Eingabetür, zentral im niedrigen posistion anwesend ist-, eine Öffnung von
der (6) das geschmolzene Metall für das Erreichen, durch die strömende Führung (7),
das Wartebassin kugelförmiger Form (8) entgeht.
3. kennzeichnete Ofensystem für Ligen des Metalls des zweiten Schmelzens hinsichtlich
Anspruches 1) durch die Tatsache, daß die strömende Führung (7) eine drehende Verbindung
zwischen der Kuppel (1) und dem Wartebassin (8) verwirklicht und daß zwischen den
zwei zylinderförmigen Körpern (11) und (12), gibt es einen Zwischenabstand ohne mehr
als irgendein Zentimeter im Modus, damit innerhalb der Dose sich drehen Sie, ohne
Friktion zu verursachen im Vergleich zu dieser Außenseite.
4. kennzeichnete Ofensystem für Ligen des Metalls des zweiten Schmelzens hinsichtlich
Anspruches 1) von der Tatsache, daß das Wartebassin kugelförmiger Form (8) durch zwei
hohle Hemisphären einstellte ein auf dem anderen festgesetzt wird, mit Wänden in feuerfestem
Material (17) und wärmeisolierendem in (18) umgeben durch eine metallische Jacke (19)
und wird teilweise in Position gebracht in eine Grube (9), die durch Unterstützungen
(10) in solcher Weise unterstützt wird, daß sein Mittagsumkreis praktisch zur gleichen
Höhe des strömenden (7) ist.
5. kennzeichnete Ofensystem für Ligen des Metalls des zweiten Schmelzens hinsichtlich
Anspruches 1) und 4) durch die Tatsache, die in der Nähe des Mittagsumkreises des
kugelförmigen Wartebassins (8) einem Brenner (20) und der Ausgangsöffnung (21) des
flüssigen Metalls gelegt werden
1. Système de fusion pour ligues de métal de second fusion qu'il comprend un dôme, un
canal de versement et un bassin d'attente de forme sphérique caractérisés par le fait que le canal de versement (7) pour le métal liquide, du cubilot (1) au bassin d'attente
de forme sphérique (8), il est constitué par deux corps câbles cylindriques à la section
circulaire, (11) et (12), d'une manière adéquate isolé, fixés chaque pour un bout
(13) et (14) respectivement au cubilot (1) et au bassin d'attente, (8) et l'autre
bout libre de chaque (15) et (16) inséré coaxialment l'un dans l'autre de manière
telle qui, par un système motorisé, le bassin d'attente (8) peut tourner l'autour
de l'axe les du système de fusion en permettant l'écoulement du métal fondu par la
bouche de sortie (21) et le remplissage de la lingotiere.
2. Système de fusion pour ligues de métal de second fusion comme à la revendication 1),
caractérisé par le cubilot (1) de forme cubique essentiellement avec des murs en matériel réfractaire
(2) entouré par une chemise de métal (3) dans lequel il est présent sur un côté le
brûleur (4) sur un autre côté le sabord de charge (5) et sur le contraire large, au
centre en bas, une ouverture (6) de lequel le métal fondu sort pour atteindre à travers
le canal de versement (7) le bassin d'attente de forme sphérique (8).
3. système de fusion pour ligues de métal de second fusion comme à la revendication 1),
caractérisé par le fait que le canal de versement, (7) réalise un joint tournant entre le cubilot, (1) et le
bassin d'attente, (8), et qu'entre les deux corps cylindriques (11) et (12), il y
a une distance entre eux, de pas plus de quelque centimètre de manière que l'intérieur
peut tourner sans causer du frottement je respecte à cet extérieur.
4. Système de fusion ligues de métal de second fusion comme à la revendication 1), caractérisé par le fait que le bassin d'attente de forme sphérique, (8) est constitué par deux sphères semi une
mise creuse sur l'autre, avec des murs en réfractaire (17) et tu isoles (18) entouré
par une chemise métallique (19) et il est positionné dans une fosse partiellement
(9) soutenu par supports (10) de manière telle qui sa circonférence méridienne soit
pratiquement à la même hauteur du canal de versement (7).
5. Système de fusion ligues de métal de second fusion comme à la revendication 1) et
4) caractérisés par le fait qu'en proximité de la circonférence méridienne du bassin d'attente sphérique, (8) est
mis un brûleur, (20) et la bouche de sortie (21) du métal liquide.