EP2454392B1 - Dispositif de revêtement d'un produit métallique continu - Google Patents

Dispositif de revêtement d'un produit métallique continu Download PDF

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Publication number
EP2454392B1
EP2454392B1 EP10716866.8A EP10716866A EP2454392B1 EP 2454392 B1 EP2454392 B1 EP 2454392B1 EP 10716866 A EP10716866 A EP 10716866A EP 2454392 B1 EP2454392 B1 EP 2454392B1
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EP
European Patent Office
Prior art keywords
tank
metal
molten
molten metal
bath
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP10716866.8A
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German (de)
English (en)
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EP2454392A1 (fr
Inventor
Andrea Guadagnini
Edoardo Guadagnini
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Danieli and C Officine Meccaniche SpA
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Danieli and C Officine Meccaniche SpA
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Publication of EP2454392A1 publication Critical patent/EP2454392A1/fr
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003—Apparatus
    • C23C2/0034—Details related to elements immersed in bath
    • C23C2/00342—Moving elements, e.g. pumps or mixers
    • C23C2/00344—Means for moving substrates, e.g. immersed rollers or immersed bearings
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/325—Processes or devices for cleaning the bath

Definitions

  • the present invention relates to a metallurgy process and it relates, in particular, to an improved method for coating a continuous metal product.
  • the present method relates, for example, to a continuous hot-dip galvanizing process of semi-finished products such as metal strips and/or wires, normally wound in coils.
  • the invention relates also to a structure that carries out this method.
  • a continuous product for example metal strip or wire
  • a continuous product for example metal strip or wire
  • the coating metals useful to this end are those that have a melting temperature low enough to avoid thermal modifications of the products to coat.
  • One of the most common coating processes is hot-dip galvanizing, with which a coating layer of zinc is topped to the metal strip or wire for protecting it from corrosion.
  • hot-dip galvanizing with which a coating layer of zinc is topped to the metal strip or wire for protecting it from corrosion.
  • continuous hot dipping is known, which allows treating continuously and quickly a large amount of material.
  • the zinc coating is carried out by dipping the wire or metal strip in a bath of molten zinc that is kept at a temperature between 440-490°C by means of electric induction systems or by combustion of natural gas.
  • the control of temperature of the bath is essential, since a too high temperature would cause an increase of the oxidation of the surface of the molten bath and then an increase of the floating dross thickness, whereas a too low bath temperature would cause an increase the viscosity of the molten metal that hampers the formation of a thin coating layer.
  • the hot dipped metal strip leaves the bath with a certain amount of molten zinc on the surface.
  • the metal strip is caused to pass through a plurality of air jets oriented towards its surface, by means of blade blowers located above the bath and shifted with respect to each other. This way, the excess of zinc is removed by blowing air or nitrogen and the system is usually adjusted by a thickness sensor of the coating metal. Since the rate of liquid excess "squeezing" that is operated by the blade blowers depends sensibly on the distance run by the metal strip after exiting the molten bath, the level of the molten bath has to be kept strictly fixed.
  • JP60141854A Another method, which is described in JP60141854A , provides a duct immersed in the hot-dip galvanizing tank with an end exiting at a height above the molten zinc surface of the hot-dip galvanizing tank. By forcing the molten zinc in the duct it exits from the duct end and falls into the hot-dip galvanizing tank.
  • This solution generates however a high waste of molten metal since the fall increases the oxidation of the metal owing to contact with the oxygen.
  • to allow the movement of the metal strip product at the bottom of the duct it is necessary to provide an sealed passage to allow the molten metal to create a surface current that frees the zone of the fall.
  • Another device as described in JP10140309 , comprises a storage reservoir for collecting floating dross associated with a hot-dip galvanizing tank capable of separating the floating dross generated by the molten metal.
  • the device comprises a means for conveying the molten metal from the hot-dip galvanizing tank to the reservoir.
  • the reservoir provides a plurality of walls that are shifted from each other in order to make a labyrinth that causes separation of the floating dross, as well as of a dross accumulated at the bottom of the molten metal.
  • the area and the size of the storage reservoir are so high that much power is consumed for keeping steady the temperature of the bath of molten metal.
  • an apparatus for metal coating a continuous metal product in particular a metal strip or a wire, comprises:
  • the floating dross, and, in particular, the floating dross surplus which accumulates on the surface layer of the molten metal bath flows down into the exit channel with part of the molten metal, whereas advantageously in the bath a layer remains of floating dross adapted to protect the molten metal from the oxygen and to limit heat dispersion.
  • the floating dross, near the outlet zone of the continuous metal product is withdrawn from exit zone of the product from the molten bath that creates a vortical flow that frees the outlet zone of the metal strip or wire, such that the floating dross cannot reach a level for which it sticks to the product at the outlet of the molten metal bath and does not cause rejects of production.
  • the exit channel allows keeping the level of the metal bath fixed, avoiding expensive controls and monitoring operations of the level to obtain a valid final product, as instead necessary with the prior art.
  • the upper edge of the channel has a function of "weir” or “overflow level”, maintaining always that level in a fixed way.
  • said exit channel is arranged peripherally along said galvanizing tank such that said closed bottom and said upper edge are in said galvanizing tank. This way, the exit channel creates a gutter channel in the galvanizing tank that works as "overflow level" and gathers the floating dross surplus present on the surface of the molten bath along with a certain amount of molten metal.
  • said exit channel has an upper edge having two heights, a lower height at said outlet zone that defines the filling level and lets to remove locally the floating dross present on the molten metal, and a higher height in all the other extension of the exit channel in the galvanizing tank in order to leave a protection of the molten metal zinc by means of the floating dross cover.
  • the bath in the outlet zone of the metal strip is free of the floating dross in order, as above described, not to cause the floating dross to stick on the metal product, whereas the resting zone of the molten bath keeps a floating dross layer to protect from heat dispersion.
  • a collection basin is provided associated with said exit channel in which said floating dross and part of the molten metal is collected.
  • the collection basin is arranged adjacent to the galvanizing tank and separated from it, so that the exit channel delivers in the collection basin said part of floating dross and the amount of that has flown down the channel, and the floating dross cannot return to the tank.
  • said collection basin is arranged within said galvanizing tank in order to allow a heat exchange from said galvanizing tank towards said collection basin.
  • the temperature of the molten zinc in the collection basin remains substantially equal to the temperature of the zinc present in the galvanizing tank.
  • said closed bottom of said exit channel is sloped with respect to the level of said molten bath for causing said floating dross and part of the molten metal to flow quickly towards said collection basin.
  • the exit channel and the collection basin act as molten metal reservoirs, allowing to add a whole ingot into the tank without need to check the fill level. In fact, only the level in the channel and the collection basin grows.
  • the collection basin acts as storage reservoir for the molten metal, such that it is possible to add different ingots at a time, saving manual work and simplifying the loading system the ingots.
  • the collection basin is located under the conveying passageway, or "snout" of the metal strip, in order to exploit that space and leave free other places in the tank.
  • the floating dross is removed from said collection basin through lifting means that convey the floating dross to a disposal site.
  • lifting means that convey the floating dross to a disposal site.
  • the floating dross that reaches the collection basin with part of the molten metal is withdrawn through a mechanical device overcoming the safety problems in case this step is effected manually.
  • the a conveyor belt is provided, for example a grid-shaped belt, is dipped in the collection basin and exits from it in a sloped direction, conveying away the floating dross and leaving the molten metal free to fall again into the collection basin.
  • said floating dross is removed superficially from said collection basin by a basket lifting means, comprising a basket integral to an arm, said arm rotatably connected about an axis, in particular said arm is arranged below said level of said molten metal and an rotate from a dipped position to an emptying position running through a draining position, wherein in said dipped position said basket is dipped into said molten metal; in said draining position said basket is arranged above said fill level such that the dross is drained from the molten metal in said basket; said emptying position reached after a programmable time, said basket slowing down quickly at said emptying position such that said arm is beaten suddenly against an abutment portion and causes said dross to fall down from said basket into a disposal site.
  • a basket lifting means comprising a basket integral to an arm, said arm rotatably connected about an axis, in particular said arm is arranged below said level of said molten metal and an rotate from a dipped position to
  • said disposal site comprises an ingot mould that reciprocates between a loading position in which said dross is collected, to a discharge position, where the disposed dross is collected.
  • the pump comprises a piston and a cylinder, which has two lateral apertures, a lower and an upper aperture.
  • the piston has a diameter slightly less than the cylinder, in order to allow a calibrated leakage.
  • An adjusting means is advantageously provided for adjusting the reciprocation pace of the piston responsive to the thickness of floating dross that has to be left to float on the molten metal of the tank.
  • said exit channel is mounted on said galvanizing tank by a connection portion.
  • the exit channel can be arranged on an existing galvanizing tank as retrofit.
  • said exit channel is made in phase of construction directly in said tank.
  • the channel is U-shaped, with an upper edge that works as weir, and the other edge, opposite to the channel, which protrudes upwards with an L-shaped portion, which can touch the edge of the tank, and then connected to it by means of suitable fixing means, for example screw connections.
  • an adjustment means is provided associated with said exit channel, adapted to adjust the height of said upper edge and then of said fill level.
  • connection portion and the upper edge stiffening elements can be provided, for example brackets, tie rods, stiffening ribs.
  • an apparatus for metal coating a continuous metal product, in particular a metal strip 15 or a wire (not shown).
  • the structure comprises a galvanizing tank 10 containing a molten metal bath 11, for example zinc, suitable to coat the metal strip 15 with a metal layer in order to obtain a zinc topped metal strip 15' and then a calibrated metal strip 15".
  • strip 15 leaves the molten bath 11 along with a certain amount of metal liquid on the surface, indicated in Fig.
  • the web 15' passes through a plurality of air jets slightly shifted from each other and oriented towards the metal strip, in the form of air blade blowers 29 arranged above the surface of the bath 17; this way, the excess of metal is removed from the metal strip by blowing air or nitrogen, obtaining the final metal strip 15".
  • the molten metal bath 11 achieves into the tank 10 a determined fill level 17 given by the combination between the molten metal and the floating dross layer 12.
  • the layer 12 represents a protection barrier for the bath, since it minimizes heat dispersion and keeps an insulation of molten metal 11 located underneath, which in turn would oxidize at the contact with oxygen causing a waste of molten metal, an excess of floating dross 12 leads to other problems described below.
  • the continuous movement of the metal product 15, made by a mechanism 25, brings the product between an inlet zone 26 where the metal product enters in the molten bath 11, a hot-dipping zone 27, where the product crosses the galvanizing tank 10, dipping in the molten bath 11, and an outlet zone 28, where the metal product 15 exits from the molten metal bath coated by metal topping 15'.
  • floating dross 12, near the outlet zone 28 of the continuous metal product 15, keeps at a distance from exit zone of the product in the molten bath 11 owing to a vortical flow that is caused in the outlet zone 28 by the exiting metal strip or wire, such that floating dross 12 cannot reach a level for which it sticks to the product that would cause rejects of production.
  • the metal strip 15 in hot-dipping zone 27 passes through a transport roller 13 and a respective counter-roller 14 in order to come out substantially in a vertical position.
  • the metal strip or the wire then passes through, as above said, through the concentrated air blade blows 29 that control the thickness of the coating calibrating the amount of metal that is deposited on the outer surface of the continuous metal product 15".
  • the structure comprises an exit channel 16 associated with galvanizing tank 10 and arranged peripherally along the latter.
  • the channel 16 as better shown in Fig. 3 and 4 , has a closed bottom 37 and an upper edge 38, the closed bottom 37 arranged below the fill level 17 of the tank 10, whereas upper edge 38 substantially at the level of the fill level 17, such that floating dross 12 flows down exit channel 16.
  • exit channel 16 works as a gutter channel in galvanizing tank 10 that gathers floating dross 12 surplus present on the surface of the molten bath along with a certain amount of molten metal in order to work as overflow.
  • upper edge 38 of channel 16 has a function of "weir” or "overflow level", maintaining always fixed level 17.
  • a collection basin is provided 40 associated with exit channel 16 in which floating dross 12 accumulates along with part of the molten metal which has flown down into channel 16.
  • collection basin 40 is arranged adjacent to galvanizing tank 10 such that suitably conformed exit channel 16 delivers in it the dross surplus and the molten metal amount that has flown down the channel.
  • collection basin 40 is located under the conveying passageway 20of the metal strip 15, or "snout", in order not to hamper other places in the tank.
  • Fig. 2 also the flow of floating dross 12 towards collection basin 40 is indicated.
  • an outflow channel 16 with a certain slope that allows the liquid stream, very dense, and the floating dross to outflow by gravity. This way, alternative mechanical systems are avoided that would bring to additional costs.
  • exit channel 16 and collection basin 40 act as molten metal reservoirs, allowing to add a whole ingot into the tank without the need to check the fill level. In fact, only the level in channel 16 and collection basin 40 can grow. By providing a sufficient storage reservoir, it is possible in particular to add different ingots at a time, saving manual work and simplifying the loading system of the ingots.
  • a step of automatic removal of dross 12 from collection basin 40 is provided that delivers it to a disposal site 35.
  • dross 12, joined to molten metal 11, has reached collection basin 40, it is removed from collection basin 40 by a lifting mechanism, visible in Fig. 1 , which conveys floating dross 12 to a disposal site, for example an ingot mould or a bin 35.
  • a lifting mechanism visible in Fig. 1
  • conveyor 31 for example a grid belt, is dipped partially in collection basin 40 and exits from it in a sloped direction, conveying away floating dross 12 and leaving the molten metal free to drop back into collection basin 11.
  • conveyor 31 has then a plane portion 32 that allows floating dross 12 to be discharged precisely in bins 35 arranged below.
  • conveyor 31 is moved by motor 90 arranged at plane portion 32.
  • the disposal site is shown through a plurality of ingot moulds 35 that are shuttled between a loading position in which they receive the dross, to a discharge position, where the disposed dross is collected.
  • FIG. 3 A further mechanism of removing floating dross 12, is shown in Figs. 3 and 4 and described correspondingly.
  • the amount of molten metal 11 present in collection basin 40 is recirculated into galvanizing tank 10 by a pump 45 that intakes the molten metal at the bottom 11 so that it is not wasted but used again for feeding the molten metal bath of tank 10.
  • pump 45 comprises a piston 46 and a cylinder 47, which has two lateral apertures, a lower lateral aperture 48 and an upper lateral aperture 49.
  • Piston 46 has a diameter slightly less than cylinder 47, in order to allow a calibrated leakage.
  • the pump can comprise an impeller immersed in collection basin 40 that delivers directly molten metal 11 into the tank.
  • an adjustment means is associated for adjusting the reciprocation pace of piston 46 responsive to the thickness of floating dross 12 that has to be left to float on the molten metal of the tank.
  • FIGS 3 and 4 show an exemplary embodiment of the structure, according to the invention, where collection basin 40' is arranged dipped in galvanizing tank 10 so that the temperature of the molten zinc in the collection basin remains substantially fixed and in line with the temperature of the zinc present the tank.
  • a heat exchange occurs between the molten metal and the walls of basin 40', in order to make uniform the temperature and transfer the heat of galvanizing tank.
  • other heating devices are not necessary for keeping the molten metal at the desired temperature.
  • changes on galvanizing tank 10 are not required and masonry work is minimum. Still advantageously, the technical time for executing the change are reduced and allow to save on the costs of installation. This solution is obviously possible if the size of galvanizing tank 10 permits it.
  • floating dross 12 is removed superficially by collection basin 40 by a basket device 91 integral to an arm 92 pivotally connected about an axis 92'.
  • basket 91 that normally is dipped in the molten zinc of collection basin 40, rotates from a dipped starting position 97 to a draining position 98 (visible in Fig. 5 ), substantially above the level of the molten metal, it waits for a determined time in order to drain the molten metal associated with floating dross 12.
  • basket 91 moves up to an emptying position 99 where, after a determined time, ends its stroke with a sudden beat that causes arm 92 to stop against a shoulder portion, to shake the "scum" off from basket 91 into bin 35.
  • arm 92 is moved by a motor 95 and the movement of basket 91 is protected by a shielding body 93.
  • the structure of Fig. 5, 6 , 7 and 8 may have exit channel 16 with an upper edge 38 with two heights, a lower height portion 16' in the outlet zone 28 of continuous metal product 15, in order to control the level of the zinc and a higher height 16", extending along galvanizing tank 10, in order to leave a thickness of floating dross 12 to protect the molten zinc.
  • the zone covered by the dross is preferably that of inlet zone 26 of the product and the zone below the conveying passageway 20.
  • the bath in the outlet zone 28 of the metal strip is free of the floating dross in order, as above described, not to cause the floating dross to stick on the metal product, whereas the resting zone of the molten bath keeps the floating dross to protect from of heat dispersion.
  • Figures 7 and 8 show instead the exemplary embodiment of the structure of Fig. 5 and 6 with collection basin 40 located out of galvanizing tank 10.
  • the tanks of the past galvanizing lines were smaller than the modern galvanizing lines, which are larger for keeping more easily the fixed level of the bath.
  • the system described allows then to go back to tanks more compact fro saving energy and reducing the tons of zinc in fusion.
  • Figures 9 and 10 show a cross sectional view of the shape of the exit channel 16, according to the invention mounted on galvanizing tank 10 by a connection portion 60 that is blocked, for example, through a plurality of screws 70 suitably spaced.
  • exit channel 16 can be arranged on an existing galvanizing tank as retrofit.
  • the channel is U-shaped, with upper edge 38 that works as weir, and the other edge 38', opposite to the channel, which protrudes upwards and forms L connection portion 60, which can touch the edge of the tank suitably distant by means of portions 65, and then connected to it by means of suitable fixing means, for example screw connections.
  • upper edge 38 can be made with different height, indicated respectively with H1 and H2, in order to adapt to the process and to the features of the molten metal present in the galvanizing tank 10, optimizing the thickness of floating dross 12 present in the molten bath.
  • an exit channel 16 can be made adjustable in height for adjusting the height of upper edge 38 of the channel and then the fill level 17 of the molten bath.
  • adjusting the height of upper edge 38 is obtained by raising the whole channel 16 through a plurality of thickness elements 67, shown in detail in Fig. 10 , arranged above a head 69 of the edge of tank 10 and locked by screws 70.
  • guiding elements are provided 71 adapted to keep aligned exit channel 16.
  • connection portion can be provided between the adjustment means, not shown, for example a coupling can be provided that is slidable and lockable between the connection portion and the channel, screw lifting systems can be provided between the connection portion and the tank, or a upper edge can be provided that is movable for sliding with respect to the channel.
  • FIG. 3 and 5 Another adjustment system, shown in Figs. 3 and 5 , provides instead a plurality of wedge portions 19 that engage a respective housing 19' integral to the connection portion of the exit channel 16. This way an operator 100 can adjust the height and align exit channel 16;
  • Figure 11 shows, perspectively, exit channel 16 of Fig. 9 , in which stiffening ribs 75 are provided adapted to confer a better structural stiffness, whereas Fig. 11' shows the reinforcement of the channel made by means of suitably distant bracket elements 76.
  • Figure 12 and the relative enlarged view of Fig. 13 show, in a diagrammatical view, galvanizing tank 10 with exit channel 16 that has a double height.
  • this allows keeping a predetermined level of floating dross 12 in the zone under conveying passageway 20 that leads strip 15 into the bath, in order to minimize the energy consumption, whereas it allows to eliminate the floating dross at the outlet zone 28 of the strip.
  • This is possible owing to a different height of upper edge 38 that works as weir for the molten metal flowing down.
  • the height changes from a height H3 to a height H4 whose difference is ⁇ .
  • Value of delta can be adjusted responsive to the kind of plant and of tank and is comprised between a few mm to several centimeters.
  • exit channel 16 can also be made on the edge of the tank.
  • exit channel 16 can be detached from the edge tank and cantilevered with respect to a collection basin immersed in the tank.
  • the exit channel may be U-Shaped and have side branches 16a that run parallel to the edge of the tank and that have a portion 16d with an upper edge where the molten metal flows into them, laterally to the outlet zone of the metal strip from the bath of molten zinc.
  • a central branch 16b reaches in 16c collection basin 40 that is immersed in the tank.
  • Collection basin 40 has two compartments that communicate in depth with each other, and precisely a compartment 40b where the floating dross and the molten zinc enter from an inlet port 40c, coincident to the outlet of the channel 16c, and a compartment 40a where a pump is immersed that recirculates the molten zinc into tank 10.
  • Collection basin 40 is kept immersed by the weight of the liquid zinc in it contained, which however reaches a level that is lower than the level surface in the tank, and by beams 170 anchored to a basement plate laterally to the tank.
  • a heater 300 is provided in a tank zone that is left free laterally outside collection basin 40. This way, the heat of the heater keeps hot also the zinc present in collection basin 40.
  • the ingots can be then dipped into the tank at this point close to heater 300
  • the feeding step of zinc ingots is carried out laterally to the tank with a walking beam system 160.
  • walking beam 160 is arranged orthogonally to the tank edge above heater 300.
  • the walking beam is mounted on a carriage 161, which is movable on wheels 162 that run on rails 163, and carries out a reciprocation and stroke predetermined by means of an actuator not shown.
  • Arms 164 raise walking beam 160 in order to lift packs of ingots 200 that are arranged on saddle supports to B C D, in order to load at each stroke a stack of ingots on a lift 155 in position E.
  • the latter is suspended by a frame150 on uprights 151, and is lowered by an actuator 152, in order to dip the ingots in front of the heater 300 in the bath of molten zinc under the liquid surface 17 in a zone 10a of the tank 10.
  • the loading operation of zinc ingots by walking beam 160 can be easily carried out by a loading means 180, and saddle supports A,B C D can be loaded all at the same time, giving to the walking beam a high autonomy.
  • packs 200 can be also very large, since collection basin 40 and the overflow level system that is assured by the presence of upper edge portion of channel 16 maintains in any case zinc level 17 fixed.
  • the floating dross 12 can be easily picked up from compartment 40b of collection basin 40 by the system of Figs. 26 and 27 through basket 95. It provides an arm 103 that rotates on hinges 101 up to beating the basket 95 against an abutment of ingot mould 108 where the dross is gathered. Ingot mould slides on rails 109 and can a large amount of dross so that it has to be emptied after many hours requiring very limited intervention by operators.

Claims (14)

  1. Appareil de revêtement métallique d'un produit métallique continu (15), en particulier d'une bande ou d'un fil métallique, ledit appareil comprenant :
    une cuve de galvanisation (10) pour contenir un bain métallique fondu (11) apte à revêtir ledit produit métallique continue (15) avec une couche métallique, ledit bain de métal fondu (11) atteignant dans ladite cuve (10) un niveau de remplissage déterminé (17), et sur ledit bain de métal fondu, une couche de scories flottantes (12) est formée ;
    un moyen pour déplacer ledit produit métallique continu entre une zone d'entrée (26) à laquelle ledit produit métallique continu entre dans ledit bain fondu (11), un chemin de galvanisation à chaud du produit métallique dans ledit bain fondu, et une zone de sortie (28) à laquelle ledit produit métallique sort dudit bain fondu revêtu par ladite couche métallique ;
    un moyen pour retirer lesdites scories flottantes (12) dudit bain métallique fondu, où ledit moyen pour retirer lesdites scories flottantes comprend au moins un canal de sortie (16) associé à ladite cuve de galvanisation (10), ledit canal de sortie ayant un fond fermé (37) et un bord supérieur (38), ledit fond fermé (37) étant agencé en dessous dudit niveau de remplissage (17) et ledit bord supérieur (38) définissant ledit niveau de remplissage de sorte qu'au moins une partie desdites scories flottantes (12) s'écoule dans ledit canal de sortie (16) pour pouvoir être recueillie facilement ;
    un bassin de collecte (40) associé audit canal de sortie (16) dans lequel lesdites scories flottantes et une partie du métal fondu sont recueillies,
    caractérisé en ce qu'il est prévu un moyen de levage pour ramasser les scories flottantes (12) dudit bassin de collecte (40), ledit moyen de levage étant sélectionné dans le groupe constitué de :
    - un moyen de levage qui convoie lesdites scories flottantes vers un site de mise au rebut (35) ;
    - un moyen de levage à panier comprenant un panier (91) intégral avec un bras (92), ledit bras (92) étant relié d'une manière tournante autour d'un axe (92').
  2. Appareil selon la revendication 1, dans lequel ledit bassin de collecte (40) est agencé en accord avec une position sélectionnée dans le groupe constitué de :
    - adjacente à ladite cuve de galvanisation (10) de sorte que le canal de sortie (16) transporte dans celle-ci dans ledit bassin de collecte (40) ladite partie de scories flottantes et ladite quantité de métal fondu qui s'est écoulé dans ledit canal de sortie, et les scories flottantes ne peuvent pas retourner dans la cuve ;
    - dans ladite cuve de galvanisation (10) pour permettre un échange thermique de ladite cuve de galvanisation vers ledit bassin de collecte (40).
  3. Appareil selon la revendication 1, dans lequel ledit canal de sortie (16) est agencé sur la périphérie le long de ladite cuve de galvanisation (10) de sorte que ledit fond fermé (37) et ledit bord supérieur (38) sont dans ladite cuve de galvanisation (10), en particulier ledit canal de sortie possède un bord supérieur ayant :
    - une hauteur inférieure à ladite zone de sortie (28) et des évacuations pour retirer localement les scories flottantes présentes sur le métal fondu et
    - une plus grande hauteur à ladite zone d'entrée (26) de ladite cuve de galvanisation pour maintenir une isolation du métal fondu au moyen des scories flottantes.
  4. Appareil selon la revendication 1, dans lequel, lorsqu'un moyen de levage de panier est prévu, ledit bras (92) est agencé en dessous du niveau dudit métal fondu et tourne d'une position immergée (97) dans une position de vidage (99) passant par une position de drainage (98), où
    - dans ladite position immergée (97), ledit panier (91) est plongé dans ledit métal fondu ;
    - dans ladite position de drainage (98), ledit panier (91) est agencé au-dessus dudit niveau de remplissage (17) de sorte que les scories sont drainées du métal fondu dans ledit panier ;
    ladite position de vidage (99) étant atteinte après un temps programmable, ledit panier (91) étant apte à ralentir rapidement à ladite position de vidage (99) de sorte que ledit bras (92) bute brusquement contre une portion de butée et amène lesdites scories à tomber dudit panier (91) dans un site de mise au rebut.
  5. Appareil selon la revendication 1, dans lequel un moyen d'ajustement est prévu, associé audit canal de sortie (16), apte à ajuster la hauteur dudit bord supérieur (38) et ensuite dudit niveau de remplissage (17).
  6. Appareil selon la revendication 1, dans lequel ledit canal de sortie (16) peut être libre de la cuve de bord et est relié en porte-à-faux à un contenant immergé dans la cuve.
  7. Appareil selon la revendication 6, dans lequel le canal de sortie est en forme de U et possède des branches latérales (16a) qui s'étendent parallèlement au bord de la cuve et ont une portion (16d) avec un bord supérieur qui agissent comme un barrage, aux côtés de la zone de sortie de la bande métallique du bain de zinc fondu, en particulier la branche centrale (16b) converge (16c) dans un bassin de collecte (40) immergé dans la cuve, en particulier le bassin de collecte (40) possède deux compartiments communiquant en profondeur l'un avec l'autre, un compartiment (40b) où les scories flottantes et le zinc fondu entrent par un orifice d'entrée (40c), qui coïncide avec la sortie du canal (16c), et un compartiment (40a) dans lequel une pompe est immergée qui assure la recirculation du zinc fondu dans la cuve (10).
  8. Appareil selon la revendication 6, dans lequel le bassin de collecte (40) est maintenu immergé par le poids du zinc liquide, qui atteint un niveau qui est plus bas que la cuve, et par des poutres (170) connectées à une plaque de base au côté de la cuve.
  9. Appareil selon la revendication 6, dans lequel un organe de chauffage (300) est prévu dans la zone de cuve non occupée par le bassin de collecte (40) de sorte que la chaleur de l'organe de chauffage maintient également au chaud le zinc présent dans le bassin de collecte (40).
  10. Appareil selon la revendication 9, dans lequel des lingots peuvent ensuite être trempés dans la cuve à un point proche de l'organe de chauffage (300).
  11. Appareil selon la revendication 1, dans lequel l'amenée de lingots de zinc est exécutée latéralement à la cuve par un système de poutres mobiles (160).
  12. Appareil selon la revendication 11, dans lequel la poutre mobile (160) est agencée orthogonalement à la cuve au-dessus de l'organe de chauffage (300) et est montée sur un chariot (161) sur des roues (162) qui roulent sur des rails (163) avec un mouvement alternatif et une course prédéterminés au moyen d'un actionneur, et des bras (164) relèvent la poutre mobile (160) pour relever des packs de lingots (20) agencés sur des supports de selle (A, B, C, D), en chargeant à chaque course un pack sur un lift (155) dans une position finale (E).
  13. Appareil selon la revendication 11, dans lequel un châssis (150) est prévu sur des montants (151), et est abaissé par un actionneur (152) pour tremper les lingots devant l'organe de chauffage (300) dans le bain de zinc fondu sous la surface liquide (17) dans une zone (10a) de la cuve (10).
  14. Appareil selon la revendication 11, dans lequel un moyen de chargement (180) de la poutre mobile (160) est réalisé qui est apte à charger les lingots sur les supports de selle (A, B, C, D) tous en même temps en obtenant une grande autonomie.
EP10716866.8A 2009-02-09 2010-02-09 Dispositif de revêtement d'un produit métallique continu Not-in-force EP2454392B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPI2009A000011A IT1395468B1 (it) 2009-02-09 2009-02-09 Metodo per il rivestimento metallico di prodotti continui e struttura che attua tale metodo
PCT/IB2010/000244 WO2010089666A1 (fr) 2009-02-09 2010-02-09 Procédé de pose de revêtement métallique sur un produit métallique continu et appareil associé

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EP2454392B1 true EP2454392B1 (fr) 2013-11-06

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JP6007765B2 (ja) * 2012-12-10 2016-10-12 新日鐵住金株式会社 溶融亜鉛めっきラインにおけるスナウト内浮遊スカム除去装置
JP6007764B2 (ja) * 2012-12-10 2016-10-12 新日鐵住金株式会社 溶融亜鉛めっきラインにおけるスナウト内浮遊スカム除去装置
JP5920276B2 (ja) * 2013-04-09 2016-05-18 Ｊｆｅスチール株式会社 スナウト内のドロス除去装置
JP6458781B2 (ja) * 2016-07-27 2019-01-30 Ｊｆｅスチール株式会社 連続溶融めっき装置およびサポートロールの押し込み量制御方法
CN110846601B (zh) * 2018-08-20 2021-12-14 上海梅山钢铁股份有限公司 一种锌液处理装置
CN110735100B (zh) * 2018-11-11 2023-01-10 嘉兴宝利机械股份有限公司 一种旋转升降式热镀锌连续生产系统及生产工艺
CN114411087B (zh) * 2021-12-29 2023-09-29 西安鑫垚陶瓷复合材料有限公司 一种涡轮导向叶片涂层制备工装及涂层制备方法

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JPS60141854A (ja) * 1983-12-29 1985-07-26 Sumitomo Electric Ind Ltd 連続溶融めつき装置
CA2131059C (fr) * 1993-09-08 2001-10-30 William A. Carter Appareil de recouvrement metallique par immersion a chaud et methode connexe
JP3083030B2 (ja) * 1993-09-10 2000-09-04 川崎製鉄株式会社 溶融亜鉛めっき浴中のＡｌ濃度の低減方法
JPH08325684A (ja) * 1995-05-30 1996-12-10 Kawasaki Steel Corp 溶融金属めっき浴中のドロス除去方法および装置
JPH10140309A (ja) * 1996-11-12 1998-05-26 Nkk Corp 溶融亜鉛めっき設備におけるドロス除去装置
AU6416599A (en) * 1998-10-05 2000-04-26 International Zinc Company Device and method for removing dross from a vessel of molten zinc with enhanced zinc yield
JP4238457B2 (ja) * 2000-03-31 2009-03-18 Ｊｆｅスチール株式会社 溶融金属めっき浴中のドロスの除去方法および溶融金属めっき装置
JP2005068545A (ja) * 2003-08-25 2005-03-17 Nippon Denro Kk 溶融亜鉛めっき浴の酸化灰の除去方法

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EP2454392A1 (fr) 2012-05-23
WO2010089666A1 (fr) 2010-08-12
ES2444540T3 (es) 2014-02-25
IT1395468B1 (it) 2012-09-21
ITPI20090011A1 (it) 2010-08-10

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