EP2176437B1 - Kühlvorrichtung zur verwendung nach der galvanisierung eines streifenmaterials - Google Patents

Kühlvorrichtung zur verwendung nach der galvanisierung eines streifenmaterials Download PDF

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Publication number
EP2176437B1
EP2176437B1 EP08827741A EP08827741A EP2176437B1 EP 2176437 B1 EP2176437 B1 EP 2176437B1 EP 08827741 A EP08827741 A EP 08827741A EP 08827741 A EP08827741 A EP 08827741A EP 2176437 B1 EP2176437 B1 EP 2176437B1
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EP
European Patent Office
Prior art keywords
cooling
strip
bath
cell
gas
Prior art date
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Not-in-force
Application number
EP08827741A
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English (en)
French (fr)
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EP2176437A2 (de
Inventor
Pierre-Jérôme BORREL
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Clecim SAS
Original Assignee
Siemens VAI Metals Technologies SAS
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Publication of EP2176437A2 publication Critical patent/EP2176437A2/de
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Publication of EP2176437B1 publication Critical patent/EP2176437B1/de
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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
    • C23C2/003—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
    • C23C2/003—Apparatus
    • C23C2/0035—Means for continuously moving substrate through, into or out of the bath
    • 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
    • C23C2/0038—Apparatus characterised by the pre-treatment chambers located immediately upstream of the bath or occurring locally before the dipping process
    • C23C2/004—Snouts
    • 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
    • C23C2/26—After-treatment
    • C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
    • 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
    • C23C2/26—After-treatment
    • C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
    • C23C2/29—Cooling or quenching
    • 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

Definitions

  • the subject of the invention is a cooling device, after galvanizing, of a strip-like product passing through a galvanizing metal bath for the deposition of a coating layer on two opposite faces of the strip.
  • the corrosion resistance of the metal sheets used in particular, in certain applications such as the building, automobile or household appliances, it is common to deposit on the surface of these sheets, a layer of zinc coating or a zinc-based alloy.
  • the sheet being made, normally, by rolling a metal strip, it can be subjected to a galvanizing treatment performed during the running of the strip in a galvanizing line.
  • the strip M continuously travels between a liquid zinc bath 31 and a final cooling bath 35, in a path defined by a plurality of deflection rolls and generally comprising a first inlet portion T1 of the strip M in the metal bath 31, in a downward direction, to a first deflector roll immersed in the bath 31, a second outlet portion T2 of the bath 31, in an upward direction, to a pair of baffle rollers 42, 42 'placed at a higher level above the bath 31 and a third portion T3 extending in a downward direction between an upper baffle roll 42' and a lower baffle roll 43 immersed in the final cooling bath 35, the band M then being evacuated, passing on a deflector roll 44, towards the rest of the installation, for example a skin-pass 15 mill.
  • the strip is covered on both sides with a zinc layer driven upwardly with the strip.
  • the covered strip then passes into a wiper device 32 of known type which makes it possible to control the thicknesses of these two coating layers.
  • French Patent No. 2,726,288 from the same company describes such an air knife dewatering device.
  • the installation may comprise, on the upstream part T2 of the path of the strip, at the outlet of the metal bath 31, a heating furnace 33 making it possible to perform a so-called alloy heat treatment which ensures the diffusion of iron from the band, to the zinc coating, to create a real iron / zinc alloy.
  • a heating furnace 33 making it possible to perform a so-called alloy heat treatment which ensures the diffusion of iron from the band, to the zinc coating, to create a real iron / zinc alloy.
  • the strip must, however, be cooled before plunging into the quenching tank 35.
  • This cooling is usually done by blowing air on both sides of the strip and the installation therefore comprises one or more cooling cells placed. in the path of the strip between the galvanizing tank 31 and the quenching tank 35.
  • the installation comprises, usually, at least one cooling cell 34 placed on the downward path T3, above the quench tank 35 and constituted by a hollow box having two lateral portions surrounding a central scroll portion of the strip and separated therefrom by a porous wall.
  • a supply duct 36 connected to blowing means (not shown), of the variable speed motor-blower type, makes it possible to introduce pressurized air into the two lateral parts of the box 34 which are separated from the central part. by porous walls 34a, 34b.
  • the air thus introduced into the lateral parts of the box 34 is diffused by the porous walls on both sides of the strip and can be evacuated through the orifices provided at the two ends of the central part of the box, for the passage of the strip M
  • the sheath 36 opens at the downstream end of the box 34 in order to provide a circulation of the air blown against the current of the scrolling of the strip.
  • the oven 33 can be removed and replaced by a cooling box placed on the upward path T2 of the strip.
  • the cooling air blown on the strip is ambient air collected outside the building and this air is subject to temperature and humidity variations that may have an influence on the quality of the deposit. . This depends, in fact, cooling conditions, particularly the kinetic energy of the air jet blown on the still liquid zinc and whose effect may vary with the air temperature.
  • ambient air that is collected externally to be blown onto the belt may contain dust that can be incorporated into the coating or accumulate in the building.
  • the galvanizing process can generate zinc dust which is then dispersed in the air escaping from the cooling cell through the inlet and outlet ports of the strip at both ends of the cooling box. 34.
  • the object of the invention is to remedy all of these disadvantages by means of a new arrangement of the cooling means.
  • the invention therefore relates, in a general manner, to a cooling device after galvanizing a strip-like product in a galvanizing metal bath for the deposition of a coating layer on two opposite faces of the strip, the device comprising a hollow box-shaped cooling cell having two lateral portions extending on either side of a central strip-running part, between two parallel porous faces, respectively, on both sides of the strip, and pressurized feed means of said side portions in a cooling gas diffused by said porous faces along both sides of the strip and discharged through the central portion of the cooling box.
  • the device comprises suction means for at least the largest part of the cooling gases discharged at the outlet of the central part of the cooling box, connected to the means for supplying pressure to the lateral parts of the box, by at least one recycling circuit on which is placed a means of cooling of the aspirated gases before their introduction under pressure into the lateral parts of the cooling box.
  • the pressurized gas supply means comprise at least one fan having a gas inlet connected to the suction means by the recycling circuit and a pressurized gas outlet connected to the two lateral parts of the cooling box.
  • the recycling circuit comprises means for filtering the sucked gases placed upstream of the fan, in the direction of circulation of the gases.
  • the recycling circuit comprises a cooling chamber having an inlet connected to the suction means and an outlet connected to the pressurized supply means and in which is placed a heat exchanger for cooling the recycled gases.
  • the two lateral parts of the cooling cell form two elongated hollow box-shaped arms extending respectively along the two sides of the strip, on either side of a central portion extending between two rectangular orifices respectively inlet and outlet of the strip
  • the cooling gas suction means comprise at least one hollow box-shaped cell placed at least upstream, in the direction of travel, of the cooling cell and having two arms respectively extending along the two lateral parts of the cooling cell, on either side of a central portion having two rectangular openings for passage of the strip, respectively an inlet and an outlet opening opening near the inlet of the strip in the central portion of the cooling cell for the passage of cooling gases in the suction cell, against the flow of the band.
  • the cooling cell extends over a certain running length of the strip between an inlet end of the strip at which the central portion of the cell is provided with at least one orifice gas suction connected to the recycling circuit, and an exit end of the strip at which placed at least one pressurized gas supply port of the two side portions of the cooling cell.
  • the device comprises two gas recirculation circuits arranged on either side of the cooling cell and each comprising a pressurized gas supply means having a gas inlet connected to a suction means placed at a pressure end of the central portion of the cooling cell and a pressurized gas outlet connected to a supply port of the side portions of said cell, and a cooling means of the recycled gas.
  • the cooling cell and the recycling circuit (s) each comprising suction, cooling and pressurized cooling gas supply means form a compact autonomous unit extending over a length limited scrolling band.
  • the strip moving, at the exit of the galvanizing bath, according to an ascending strand then a downward strand passing over at least one deflector roll comprises at least two compact assemblies placed respectively on the ascending strand and on the strand. downstream and each comprising a cooling cell and at least one recycling circuit with means for suction, cooling and pressurized supply of cooled gas, said assemblies being offset in height so as to be staggered in order to reduce their overall size.
  • the entire installation comprising means for controlling the movement of the strip between a galvanizing bath and a quenching bath and at least one cooling unit comprising a cooling cell and a recycling circuit, is disposed inside a closed building, provided with means for recovering gases and dust and means of sound insulation.
  • the invention is particularly applicable to a galvanic coating installation of a strip product, comprising means for controlling the running of the strip between a liquid metal bath and a quenching bath, along a continuous line.
  • scrolling member defined by a plurality of baffle rollers and having at least one ascending strand output of the metal bath and a descending strand.
  • such an installation can be equipped with several autonomous cooling units, placed respectively on the upstream strand and on the descending strand and each comprising a cooling cell and at least one recycling circuit with suction means. , cooling and pressurized supply of cooled gas.
  • these self-cooling units with gas recirculation are offset in height relative to each other so as to be placed in position. staggered in order to reduce their overall footprint and the footprint of the installation.
  • the quenching bath is placed above the metal bath, so that the entire line of travel, between the metal bath and the quench bath, remains in a footprint of the same order as that of the metal bath.
  • the strip is supported by a first face on a first baffle roll immersed in the metal bath, coming from a first side thereof and is supported by the same first face on a second baffle roller placed at a higher level, so that the descending portion of the strip is placed on the same first side of the metal bath relative to the upward portion of the output of the metal bath.
  • the second face of the strip comes into contact with a baffle roller after sufficient cooling and its surface quality is retained.
  • this arrangement makes it possible to place on a second side of the metal bath, opposite to the first input side of the strip, a quality control station of the coating, in front of which passes said second face of the strip, of first in the ascending part of the outlet of the metal bath, then in the last descending part of the output of the installation, after final cooling.
  • FIG. 2 schematically, in elevation, there is shown a cooling device comprising a rectangular section box 5 having, in the manner indicated on FIG. figure 3 , two lateral parts 51, 51 'which extend on either side of a central portion 50 having, at its ends, an inlet orifice 52 and an outlet orifice 52' for the passage of the band M which scrolls inside the box 5 according to a substantially vertical scrolling plane.
  • Each lateral portion 51, 51 ' is separated from the central portion 50 by a porous face 53, 53' for diffusing, on both sides of the strip M, air introduced under pressure into the box 5 which can therefore be of the same type as the cooling cell 34 described above with reference to the figure 1 .
  • the cooling cell 34 is placed on the descending run T3 of the strip and the pressurized air is thus introduced through the sheath 36, preferably at its lower part, in order to flow against the current of the running direction of the strip. .
  • the cooling cell 5 is placed on the ascending strand of the band M, the inlet orifice 52 thereof being thus placed at the lower part of the box 5 and the outlet orifice 52 'at its part higher. Consequently, the air under pressure is introduced by a sheath 54 opening to the upper part of the box 5, between the two arms 51, 51 'thereof. This air is blown by a variable speed motor-blower unit 60 having an inlet 61 and an outlet 62 on which is connected the sheath 54 for supplying the box 5.
  • the cooling cell is supplied with ambient air
  • the cooling cell 5 is associated with a recycling circuit 6 for supplying the fan 60 with air sucked at the outlet of the central portion 50 of the box 5.
  • the cooling cell 5 is associated with a recovery cell 7 in the form of a hollow box, placed upstream of the box 5, in the running direction of the strip, that is to say below the box 5 in the case of the figure 3 where the box is placed on an ascending strand.
  • the recovery cell 7 is therefore also constituted by a hollow box having two rectangular openings for the passage of the strip, respectively a lower inlet orifice 71 and an upper outlet orifice 72 which opens close to the orifice 52.
  • the recovery box 7 comprises a gas outlet orifice 73 which is connected to the inlet 61 of the fan 60 via a recycling circuit 6 on which is placed a means 8 for cooling the aspirated gases.
  • the cooling means 8 is a closed chamber comprising a central chamber 81 in which opens a sheath 74 for evacuation of gases, connected to the outlet orifice 73 of the recovery box 7 and an upper portion 82 in the form of convergent on which is connected the inlet 61 of the fan 60.
  • the enclosure 8 is closed by a bottom 85 separated from the central chamber 81 by a grid 86, and forming a filtered dust collection pot.
  • the inlet 71 of the entrance of the band M in the recovery box 7 has a limited width so as to simply allow the passage of the band without risk of deterioration, taking into account the vibrations thereof. It is the same for the orifice 52 'of exit of the band, formed at the upper end of the cooling box 5.
  • the upper orifice 72 of the box 7 and the lower orifice 52 of the cooling box 5 are a little more open and the two boxes 5 and 7 can, moreover, be connected by a deformable seal. In this way, at least the majority of the gases introduced under pressure by the sheath 54 to the upper part of the cooling box 5 are discharged through the lower orifice 52 and sucked by the recovery box 7 in order to be returned to the inlet 61 of the fan 60 through the recycling circuit 6, after cooling in the chamber 8.
  • this circulation in a closed circuit of the cooling air makes it possible to filter it as soon as it leaves the recovery box 7 by eliminating the zinc dust that can be generated by the galvanizing process and which, usually, are dispersed in the ambient air.
  • the process according to the invention therefore makes it possible, on the one hand, to improve the quality of the coating and, on the other hand, to protect the environment.
  • the cooling cell 5 forms, with the recovery cell 7 and the fan 60 placed on the recycling circuit 6, a compact assembly which can be more easily isolated to prevent the diffusion of dust and the transmission of noises.
  • the figure 4 shows, in vertical section, another embodiment of such a compact cooling assembly with gas recirculation.
  • This cooling device comprises, as in the case of Figures 2 and 3 an elongate well 5 having two lateral portions 51, 51 'extending on either side of a central portion 50 and separated therefrom, each by a porous wall 53, 53' parallel to a vertical plane of running the band that passes through the central portion 50, between a lower inlet orifice 52 and an upper outlet orifice 52 '.
  • the two lateral parts 51, 51 ' are not interconnected and each comprises a gas inlet port 55, 55' connected by a supply duct 54, 54 'to the outlet 62, 62' d a variable speed motorcycle fan unit 60, 60 '.
  • These two fans 60, 60 ' have a vertical axis and are preferably arranged symmetrically on either side of the vertical plane of travel of the band M.
  • the central portion 50 is provided with two orifices 73 of gas suction, each connected by a sheath recovery 74, 74 ', to a recycling and cooling circuit 6, 6'.
  • Each recycling circuit 6, 6 ' comprises a cooling chamber 81 connected by a convergent 82 to the inlet 61 of the fan 60. In the cooling chamber 81 passes a circuit 83 for circulating a heat transfer fluid.
  • the cooling chamber 81 is separated from the convergent 82 by a filter wall 84 and is extended downwards by a pot 85 for collecting the filtered dusts.
  • the whole of The fan 60 and the cooling chamber 81 thus form a circuit 6 for recycling and cooling the air which is introduced under pressure into the lateral part 51 of the box 5 via the supply orifice 55, which diffuses on the face corresponding M band through the porous wall 53, and is recovered by the suction port 73 and returned to the cooling chamber 81 before returning to the inlet of the fan 60.
  • the second lateral part 51 'of the box 5 is likewise associated with a recycling and cooling circuit 6' similar to the circuit 6.
  • the cooling box 5 forms, with the recycling and cooling circuits 6, 6 ', a compact assembly which can be placed in different places in the path of the strip.
  • the figure 5 shows, for example, how several cooling devices according to the invention can be adapted to a galvanization section of conventional type, as shown in FIG. figure 1 , in which the strip plunges into the galvanizing tank 31 by passing over a submerged roll 41, springing from it in a rising path T2 to upper deflector rollers 42, 42 'and then a downward path T3 to a deflector roll 43 immersed in the quenching tank 35.
  • the galvanizing section may comprise an alloying oven 33 placed at the outlet of the galvanizing tank 31 above the wiper device 32 and extending over a certain length of the upward path T2.
  • the compact arrangement of the cooling device according to the invention makes it possible to place above the alloying oven 33 a first cooling box 5a associated with one or two recycling circuits with cooling 6a.
  • the strip M plunges into the metal bath 31 along a downward path T1 between the baffle roll 40 of the annealing furnace and the immersed roll 41, and then comes out of the bath 31 along an upward path T2 and then back down to the quench bath 35 in a downward path T3.
  • the band M returns to the side through which it had entered the tank 30 containing the metal bath 31, that is to say to the left side in the figures.
  • the quenching bath 35 is then placed above the galvanizing metal bath 31 and not next to it, towards the exit of the strip.
  • the entire galvanizing installation can be arranged in a kind of tower whose footprint does not substantially exceed that of the galvanizing tank 30.
  • such a tower containing the entire galvanizing section can be isolated globally with respect to the environment, both to avoid air pollution by capturing the dust generated by the galvanizing, and to reduce the noises.
  • an oven 33 is placed above the wiper device 32 and can be followed by cooling cells 5 placed, not only on the upstream path T2, upstream of the upper roller 42, but also on the downward path T3, above the lower roller 43, each cell 5 being associated with a recycling circuit 6 with cooling of the blown air.
  • this arrangement requires the construction, above the metal bath 31, of a floor to support the quench tank 35, but this increase in height of the installation does not constitute a real disadvantage, especially for the transformation of an existing installation.
  • the transfer of the quench bath above the metal bath makes it possible to release, next to it, a space which, as will be seen more far, can be used, for example, to place a station 37 for checking the quality of the tape.
  • the upper roller 42 may be placed at a height sufficient to provide the number of cooling cells 5a, 5b necessary to obtain sufficient cooling of the strip before the contact of its side A 'with the lower roller 43.
  • this roll 43 can be immersed in the quench bath 35.
  • the band M can ascend in an upward path T31 to a second upper roller 44, then descend, in a downward path T32, to a baffle roll 45 immersed in the final cooling bath 35.
  • the band M follows a rising path T4 to a pair of upper deflector rollers 46, 46 'spaced apart from each other, so as to pass the band over the whole of the galvanizing section, then down, by a downward path T5, to a lower roller 47 to be directed towards the rest of the installation, for example a skin-pass 15 mill.
  • a verification station 37 for example a control cabin for an operator.
  • This station 37 can thus be placed between the first ascending section T2 of the outlet of the metal bath 31 and the last outlet T5 downstream section of the installation, deflector rollers 48 allowing, possibly, to provide the necessary location for the station 37 .
  • the operator sees passing in front of him, successively, twice the same face A '. Knowing the total length of the path and the running speed of the belt which can be measured at any moment, the operator can therefore locate on the exposed face A 'of the belt, immediately above the wiper device 32, a doubtful zone and, after having allowed the time necessary for scrolling, to identify the passage of the same zone on the descending path T5 in order to check the possible presence of a defect after the final cooling and hardening of the coating.
  • each cooling assembly comprising an air blast cell 5, a suction box 7 and a recycling circuit 6 with cooling 8 makes it possible to dispose of such assemblies 5, 6, 7, 8 not only along the upward path T2 but also along the downward path T3, so as to achieve sufficient cooling of the coating until the passage of the exposed face A 'on the lower roller 43.
  • these cooling cells 5a, 5b, 5c, each associated with a circuit (not shown) for recycling and cooling can advantageously be staggered on the ascending strand T2 and the descending strand T3.
  • the two strands T2, T3 can be separated by a single upper roller 42, which further reduces the footprint of the assembly.
  • such an arrangement makes it possible to distribute the cells 5 over a greater length of band and thus to have a less violent blow, which reduces the risks of vibration of the band. may have an impact on the quality of the coating, in particular, the regulation of its thickness.
  • the arrangement of the recycling and cooling circuit represented on the Figures 3 and 4 is reversed when the band is flowing from top to bottom, the blowing orifice 54 then being placed at the bottom of the cooling cell 5 and the suction opening 73 at the upper part thereof.
  • the suction box 7 must be disposed above the cooling box 5 if the band flows downwards, so that the flow of air is always blowing against the flow of the band.
  • this cooling air is recovered and recycled, it would be possible to use, for cooling, not the ambient air but another heat transfer fluid, for example a neutral gas.
  • the invention is not limited to the case where, to reduce the length of the annealing line, the strip follows a zig-zag path by passing over two sets of rollers spaced apart in height.
  • the invention can also be applied to the case of a continuous annealing furnace in which the band scrolls horizontally over a large length.
  • the quenching bath 35 which, according to the invention, is offset backward from the galvanizing bath 31, can be placed above the outlet end of the annealing enclosure 8 'whose height is, then , relatively reduced.
  • the third part T3 of the path of the strip then extends horizontally by returning upstream to the quench tank 35 which is shifted back a distance sufficient to dispose along said strand T3, at least one compact assembly 5, 6, 7, 8.
  • the fourth portion T4 output quench bath 35 then returns horizontally downstream passing over said cooling assembly.
  • the footprint of the coating plant 3 does not substantially exceed that of the galvanizing bath 31.
  • the invention has been described in the usual case of a coating by passing on a roll immersed in a bath of liquid metal but it could also be applied to other coating devices, for example of the type in which the galvanizing metal bath is maintained magnetic levitation by means of induction coils disposed along the upward path of the strip after passing on the lower roller 41 which, in this case, is not immersed.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Thermal Sciences (AREA)
  • Coating With Molten Metal (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Claims (18)

  1. Kühlvorrichtung zur Verwendung nach der Galvanisierung eines bandförmigen Produkts (M), das zum Aufbringen einer Beschichtung auf zwei entgegengesetzte Seiten des Bandes (M) durch ein Galvanisierungsmetallbad (31) läuft, wobei die Vorrichtung eine Kühlzelle (5) in Form eines hohlen Kastens mit zwei seitlichen Teilen, die sich beiderseits eines mittleren Teils zum Ablaufen des Bandes (M) zwischen zwei porösen Flächen erstrecken, die jeweils parallel zu den beiden Seiten des Bandes (M) verlaufen, und Mittel zur Beaufschlagung dieser seitlichen Teile unter Druck mit einem Kühlgas, das durch diese porösen Flächen entlang der beiden Seiten des Bandes (M) diffundiert und über den mittleren Teil des Kühlkastens (5) abgeführt wird, umfasst, dadurch gekennzeichnet, dass sie Mittel zum Ansaugen (7, 73) von mindestens dem überwiegenden Teil der zum Auslass des mittleren Teils (50) des Kühlkastens (5) abgeführten Kühlgase umfasst, die mit den Mitteln (60) zur Beaufschlagung der seitlichen Teile (51, 51') des Kastens (5) unter Druck über mindestens einen Rückführungskreis (6) verbunden sind, an dem ein Mittel (8) zum Kühlen der angesaugten Gase vor ihrem Einführen unter Druck in die seitlichen Teile (51, 51') des Kühlkastens (5) angeordnet ist.
  2. Kühlvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Mittel zur Beaufschlagung mit Gas unter Druck mindestens ein Gebläse (60) umfassen, dessen Gaseinlass (61) mit den Ansaugmitteln (7, 73) über den Rückführungskreis (6) verbunden ist und dessen Druckgasauslass (54) mit den seitlichen Teilen (51, 51') des Kühlkastens (5) verbunden ist.
  3. Kühlvorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass der Rückführungskreis (6) ein Mittel (84) zum Filtern der angesaugten Gase umfasst, das in Zirkulationsrichtung der Gase gesehen stromauf des Gebläses (60) angeordnet ist.
  4. Kühlvorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Rückführungskreis (6) eine Kühlkammer (8) umfasst, deren Einlass (74) mit den Ansaugmitteln (7, 73) verbunden ist und deren Auslass (82) mit den Mitteln zur Beaufschlagung unter Druck (60) verbunden ist und in der ein Wärmetauscher (83) zum Kühlen der rückgeführten Gase angeordnet ist.
  5. Kühlvorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass die Kühlkammer (8) mit den Mitteln zur Beaufschlagung unter Druck (60) über eine Leitung (82) verbunden ist, an der eine poröse Wand (84) zum Filtern der rückgeführten Gase angeordnet ist und die einen unteren Teil (85) zur Rückgewinnung der von den angesaugten Gasen mitgeführten und von der Filterwand (84) zurückgehaltenen Partikel umfasst.
  6. Kühlvorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die beiden seitlichen Teile (51, 51') der Kühlzelle (5) zwei längliche hohle kastenförmige Arme bilden, die jeweils entlang der beiden Seiten des Bandes (M) beiderseits eines mittleren Teils (50) verlaufen, der sich zwischen zwei rechteckigen Öffnungen, und zwar einer Einlassöffnung (52) und einer Auslassöffnung (52') für das Band (M) erstreckt, und dass die Mittel zum Ansaugen des Kühlgases mindestens eine Rückgewinnungszelle (7) umfassen, die in der Nähe der Kühlzelle (5) mindestens auf der Seite des Einlasses (52) für das Band (M) angeordnet ist, wobei diese Rückgewinnungszelle (7) einen hohlen Kasten mit zwei Armen bildet, die jeweils entlang der beiden seitlichen Teile (51, 51') der Kühlzelle (5) beiderseits eines mittleren Teils verlaufen, der zwei rechteckige Öffnungen zum Durchführen des Bandes besitzt, und zwar eine Einlassöffnung (71) und eine Auslassöffnung (72), die sich in der Nähe der Einlassöffnung (52) für das Band (M) im mittleren Teil (50) der Kühlzelle (5) öffnet, um die Kühlgase in die Rückgewinnungszelle (7) gegenstromig zum Ablaufen des Bandes (M) durchzuführen.
  7. Kühlvorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass sich die Kühlzelle (5) über eine bestimmte Ablauflänge des Bandes (M) zwischen einem Einlassende für das Band (M), an dem der mittlere Teil (50) der Zelle mit mindestens einer Gasansaugöffnung (73) ausgestattet ist, die mit dem Rückführungskreis (6) verbunden ist, und einem Bandauslassende, an dem mindestens eine Öffnung (55) zur Beaufschlagung der beiden seitlichen Teile (51, 51') der Kühlzelle (5) mit Gas unter Druck angeordnet ist, erstreckt.
  8. Kühlvorrichtung nach einem der Ansprüche 6 und 7, dadurch gekennzeichnet, dass sie zwei Gasrückführungskreise (6, 6') umfasst, die beiderseits der Kühlzelle (5) angeordnet sind und jeweils ein Mittel (60, 60') zur Beaufschlagung mit Gas unter Druck mit einem Gaseinlass (61), der mit einem Ansaugmittel (7, 73) verbunden ist, das an einem Ende des mittleren Teils (50) der Kühlzelle (5) angeordnet ist, und einem Druckgasauslass (62), der mit einer Öffnung (55) zur Beaufschlagung der seitlichen Teile (51, 51') dieser Zelle (5) verbunden ist, und ein Mittel (8) zum Kühlen des rückgeführten Gases umfassen.
  9. Kühlvorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Kühlzelle (5) und der Rückführungskreis (6), die Mittel zum Ansaugen (7, 73), Kühlen (8) und Beaufschlagen unter Druck (60) mit gekühltem Gas umfassen, eine eigenständige kompakte Einheit bilden, welche sich über eine begrenzte Ablauflänge des Bandes (M) erstreckt.
  10. Kühlvorrichtung nach einem der vorangehenden Ansprüche zur Verwendung in einer Galvanisierungsanlage, die Mittel zum Steuern des Ablaufens des Bandes zwischen einem Galvanisierungsbad (31) und einem Härtungsbad (35) entlang eines Aufwärtstrums (T2) und mindestens eines Abwärtstrums (T3) über mindestens eine Umlenkwalze (42) umfasst, dadurch gekennzeichnet, dass die Anlage mindestens eine eigenständige Kühleinheit umfasst, die entweder am Aufwärtstrum (T2) oder am Abwärtstrum (T3) angeordnet werden kann und eine Kühlzelle (5a, 5b) und mindestens einen Rückführungskreis (6a, 6b) mit Mitteln zum Ansaugen (7, 73), Kühlen (8) und Beaufschlagen unter Druck (60) mit gekühltem Gas umfasst.
  11. Kühlvorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die gesamte Anlage, die Mittel zum Steuern des Ablaufens des Bandes zwischen einem Galvanisierungsbad (31) und einem Härtungsbad (35) und mindestens eine eigenständige Einheit mit einer Kühlzelle (5) und einem Rückführungskreislauf mit Kühlung der Gase (6) umfasst, in einem geschlossenen Raum mit Mitteln zum Auffangen von Staub und Mitteln zur Schalldämmung angeordnet ist.
  12. Beschichtungsanlage für ein bandförmiges Produkt (M) mit Mitteln zum Steuern des Ablaufens des Bandes (M) zwischen einem Flüssigmetallbad (31) und einem Härtungsbad (35) entlang einer kontinuierlichen Ablaufstrecke, die durch eine Vielzahl von Umlenkwalzen definiert wird und ein aus dem Metallbad (31) austretendes Aufwärtstrum (T2) und mindestens ein Abwärtstrum (T3) umfasst, dadurch gekennzeichnet, dass sie mindestens eine eigenständige Kühleinheit nach einem der Ansprüche 1 bis 9 umfasst, die an dem einen oder anderen Trum der Strecke angeordnet werden kann, d.h. an dem aus dem Metallbad (31) austretenden Aufwärtstrum (T2) oder aber an einem anderen Aufwärts- oder Abwärtstrum (T3), wobei jede Einheit (5) eine Kühlzelle (5a, 5b) und mindestens einen Rückführungskreis (6a, 6b) mit Mitteln zum Ansaugen (7, 73), Kühlen (8) und Beaufschlagen unter Druck (60) mit gekühltem Gas umfasst.
  13. Beschichtungsanlage nach Anspruch 11, dadurch gekennzeichnet, dass sie mindestens zwei eigenständige Kühleinheiten (5) mit Gasrückführung umfasst, die entlang eines Aufwärtstrums (T2) bzw. eines Abwärtstrums (T3) angeordnet sind, und dass diese Einheiten (5a, 5b) in der Höhe zueinander versetzt sind, so dass sie in Fünfpunktanordnung angeordnet sind, um den Gesamtplatzbedarf und die Stellfläche der Anlage zu verringern.
  14. Beschichtungsanlage nach einem der Ansprüche 12 und 13, dadurch gekennzeichnet, dass das Härtungsbad (35) oberhalb des Metallbades (31) angeordnet ist, so dass die gesamte Ablaufstrecke zwischen dem Metallbad (31) und dem Härtungsbad (35) dieselbe Stellfläche wie das Metallbad (31) einnimmt.
  15. Beschichtungsanlage nach Anspruch 14, dadurch gekennzeichnet, dass das Band (M) mit einer ersten Seite (A) an einer ersten Umlenkwalze (41) anliegt, die in das Metallbad (31) getaucht ist, wenn es von dessen erster Seite kommt, und mit derselben ersten Seite (A) an einer zweiten, höher angeordneten Umlenkwalze (42) anliegt, so dass der Abwärtsteil (T3) in Bezug auf den aus dem Metallbad (31) austretenden Aufwärtsteil (T2) auf derselben ersten Seite des Metallbades (31) angeordnet ist.
  16. Beschichtungsanlage nach Anspruch 15, dadurch gekennzeichnet, dass sie eine Station (7) zur Prüfung der Qualität der Beschichtung umfasst, die auf einer zweiten Seite des Metallbades (31) gegenüber der ersten Eintrittsseite des Bandes (M) angeordnet ist und vor der in dem aus dem Metallbad austretenden Aufwärtsteil (T2) eine zweite Seite (A') des Bandes, die der ersten, an der ersten und zweiten Umlenkwalze (41, 42) anliegenden Seite (A) entgegengesetzt ist, entlangläuft, und dass das Band über eine in das Härtungsbad (35) eingetauchte Umlenkwalze (45) läuft, wobei es mit seiner zweiten Seite (A') an der eingetauchten Walze (45) anliegt, dann wieder über die gesamte Anlage läuft und dabei mit derselben zweiten Seite (A') an zwei oberen, voneinander beabstandeten Walzen (46, 46') anliegt und in einem letzten absteigenden Ausgangsteil der Anlage (T5) wieder heruntergeführt wird, wobei dieselbe Seite (A') des Bandes (M) vor der Prüfstation (7) entlangläuft, so dass der Zustand der Beschichtung auf dieser zweiten Seite (A') zum einem beim Austreten aus dem Metallbad (31) und zum anderen am Ausgang der Anlage nach dem abschließenden Kühlen geprüft wird.
  17. Beschichtungsanlage nach einem der Ansprüche 12 bis 16, dadurch gekennzeichnet, dass sie ein Mittel (33) zum Erwärmen des Bandes (M), das in dem aus dem Metallbad (31) austretenden Aufwärtsteil (T2) unmittelbar über diesem Metallbad angeordnet ist, und eine kompakte Kühleinheit mit Rückführung (5a, 6a), die oberhalb des Mittels (33) zum Erwärmen angeordnet ist, umfasst.
  18. Beschichtungsanlage für ein bandförmiges Produkt (M) mit Mitteln zum Steuern des Ablaufens des Bandes (M) zwischen einem Flüssigmetallbad (31) und einem Härtungsbad (35) entlang einer kontinuierlichen Ablaufstrecke, die durch eine Vielzahl von Umlenkwalzen definiert wird und mindestens vier Teile umfasst, und zwar einen ersten Eintrittsteil (T1) des Metallbades (31), einen zweiten Austrittsteil (T2) des Bades (31), einen dritten Kühlteil (T3) und einen vierten Austrittsteil (T4) des Härtungsbades (35), dadurch gekennzeichnet, dass sie mindestens eine eigenständige Kühleinheit (5) nach einem der Ansprüche 1 bis 11 umfasst und dass die Beschichtungsanlage in Ablaufrichtung gesehen stromab einer Glühanlage angeordnet ist, die sich in einer geschlossenen Kammer (8') zum Aufrechterhalten einer nicht oxidierenden Atmosphäre befindet, wobei sich diese Kammer (8') horizontal zwischen einem Eintrittsende und einem Austrittsende mit einer Verbindungsrinne erstreckt, die in das Galvanisierungsmetallbad (31) mündet, dass das Härtungsbad (35) oberhalb der geschlossenen Kammer (8') in einem bestimmten Abstand stromauf des Austrittsendes angeordnet ist und dass sich der dritte Teil (T3) der Bahn des Bandes, an der entlang mindestens ein Kühlmittel (5) angeordnet ist, horizontal oberhalb der geschlossenen Kammer (8') erstreckt, wobei er stromauf bis zum Härtungsbad (35) zurückgeführt wird, von dem an sich der vierte, aus dem Bad austretende Teil (T4) horizontal stromab an den Kühlmitteln (5) vorbei erstreckt.
EP08827741A 2007-08-10 2008-07-03 Kühlvorrichtung zur verwendung nach der galvanisierung eines streifenmaterials Not-in-force EP2176437B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0757021A FR2919877B1 (fr) 2007-08-10 2007-08-10 Dispositif de refroidissement apres galvanisation d'un produit en bande
PCT/FR2008/000969 WO2009024683A2 (fr) 2007-08-10 2008-07-03 Dispositif de refroidissement apres galvanisation d'un produit en bande

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EP2176437A2 EP2176437A2 (de) 2010-04-21
EP2176437B1 true EP2176437B1 (de) 2011-01-12

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CN115074653B (zh) * 2022-08-12 2022-11-11 如皋富美龙金属制品有限公司 一种热镀锌铁丝冷却钝化装置

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US5186885A (en) * 1990-10-22 1993-02-16 Perneczky George C Apparatus for cooling a traveling strip
FR2796139B1 (fr) * 1999-07-06 2001-11-09 Stein Heurtey Procede et dispositif de suppression de la vibration des bandes dans des zones de soufflage de gaz, notamment des zones de refroidissement
JP3814170B2 (ja) * 2001-08-08 2006-08-23 新日本製鐵株式会社 溶融メッキ鋼板の冷却方法及びその装置
JP3762722B2 (ja) * 2002-07-25 2006-04-05 新日本製鐵株式会社 溶融めっき鋼板の冷却装置および冷却方法
JP4331982B2 (ja) * 2002-09-27 2009-09-16 新日本製鐵株式会社 鋼帯の冷却装置

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ATE495276T1 (de) 2011-01-15
WO2009024683A2 (fr) 2009-02-26
WO2009024683A3 (fr) 2009-05-07
FR2919877B1 (fr) 2009-10-09
EP2176437A2 (de) 2010-04-21
DE602008004543D1 (de) 2011-02-24
FR2919877A1 (fr) 2009-02-13

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