EP0249234B1 - Dispositif d'évacuation pour couvrir bilatéralement en continu un ruban à métaux - Google Patents

Dispositif d'évacuation pour couvrir bilatéralement en continu un ruban à métaux Download PDF

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Publication number
EP0249234B1
EP0249234B1 EP87108473A EP87108473A EP0249234B1 EP 0249234 B1 EP0249234 B1 EP 0249234B1 EP 87108473 A EP87108473 A EP 87108473A EP 87108473 A EP87108473 A EP 87108473A EP 0249234 B1 EP0249234 B1 EP 0249234B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
blow
gap
strip
compressed air
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.)
Expired
Application number
EP87108473A
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German (de)
English (en)
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EP0249234A1 (fr
EP0249234B2 (fr
Inventor
Heinrich Pannenbecker
Ronald Jabs
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Duma Konstruktionsbuero
Original Assignee
Duma Konstruktionsbuero
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Filing date
Publication date
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Application filed by Duma Konstruktionsbuero filed Critical Duma Konstruktionsbuero
Priority to AT87108473T priority Critical patent/ATE45390T1/de
Publication of EP0249234A1 publication Critical patent/EP0249234A1/fr
Application granted granted Critical
Publication of EP0249234B1 publication Critical patent/EP0249234B1/fr
Publication of EP0249234B2 publication Critical patent/EP0249234B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
    • C23C2/18—Removing excess of molten coatings from elongated material
    • C23C2/20—Strips; Plates

Definitions

  • the invention relates to a device for blowing off superfluous coating material in the continuous coating of metal strip on both sides, in particular when galvanizing steel strip, with a blow-off nozzle which is arranged parallel to the metal strip surface and is pressurized with compressed air, the nozzle gap of which is formed by two mutually adjustable nozzle lips, the gap length of the blow-off nozzle being greater than the width of the metal band.
  • a blow-off nozzle is arranged on both sides of the strip that is led out of a coating agent bath.
  • the length of the blow-off nozzle must always be a safety distance greater than the bandwidth, so that reliable blow-off can also take place in the area of the strip edge.
  • the compressed air jets of the two blow-off nozzles directly opposite each other in the area outside the strip edges cause air swirling to occur.
  • the air turbulence also leads to a deterioration in the quality of the strip coating, since this becomes uneven in the region of the strip edges, i.e. so-called "growths" occur at the band edges.
  • edge nozzles are used in the edge area of the belt, which reduce the air turbulence mentioned at the edges by targeted blowing on the same. It is known to adjust these edge nozzles externally at the relevant points to the respective strip edge.
  • manual adjustment of the edge nozzles with regard to the blowing direction and the amount of air is very complex and must always be carried out anew when the metal bandwidth changes.
  • this results in an additional amount of compressed air during blowing which, since the blowing takes place in the immediate vicinity of the coating agent bath, favors an increased formation of slag on the surface of the coating agent.
  • the object of the invention is therefore to create a device of the type mentioned at the outset which enables economical use of compressed air which is optimized for the respective metal strip conditions and improved handling of the device.
  • This object is achieved according to the invention in that a cover element guided by the blow-off nozzle is provided, by means of which the compressed air supply to the nozzle gap can be covered in the region outside the gap length which is respectively adapted to the metal strip width.
  • the solution according to the invention is characterized in that the effective nozzle gap length is in each case set to the suitable value which is predetermined by the product.
  • the optimally metered supply of compressed air effectively prevents the coating material from growing on the edges of the metal strip due to inhomogeneous air flow conditions. Because the cover element is guided by the blow-off nozzle, it forms a compact unit with it, which makes the handling of the device much easier. By covering the amount of air gap that is not required for the respective application, compressed air is saved on the one hand and therefore less compressed air escapes into the outside area in the area of the coating agent bath, thereby reducing the tendency to form slag.
  • the device is particularly advantageous because in the edge region of the metal strip there is no direct, mutual flow of the compressed air from the two blow-off nozzles respectively assigned to the strip sides. This effectively suppresses flow noise at the belt edges.
  • the structural unit of the blow-off nozzle, edge nozzle and guide belt allows both a functionally reliable manual setting of the blow-off conditions and the possibility of an automatic adjustment of the nozzle gap length as a result of a motor drive controlling the guide belt, so that the blow-off conditions can be constantly adapted to the respective belt path.
  • the blow-off nozzle 1 is arranged with its nozzle gap 2 at a certain distance from a side surface of the metal strip 33 to be coated which is guided past it.
  • the blow-off air is first introduced into the chamber a of the blow-off nozzle 1 from an external compressed air source and enters a prechamber b through a perforated wall 19.
  • Compressed air passes from the pre-chamber b through a filter disk 8, which is made of a porous material consists of sintered bronze with a pore size of at least 80 J.1m, in the nozzle area c.
  • the nozzle space c is formed by nozzle lips 4 which open the nozzle gap 2 opposite one another.
  • Each of the two nozzle lips 4 is fastened to the corresponding upper or lower housing part of the blow-off nozzle 1, ie to the upper part 3 or to the base body 5, by screw connections. While the base body 5 is stationary, the upper part 3 of the blow-off nozzle is deformable, so that the size of the nozzle gap 2 can be adjusted continuously from the outer region of the nozzle 1 by adjusting an adjusting screw 7 acting between the lower and the upper part of the housing.
  • the amount of blow-off air flowing onto the belt can be adjusted.
  • a plurality of adjusting screws 7 are provided over the width of the blow-off nozzle, so that the profile of the compressed air distribution can be variably adjusted over the width of the metal strip 33. This allows the blow-off device e.g. to be adapted over the course of the bandwidth to different viscosity ratios of the coating agent in the area of the blow-off nozzle 1 by appropriate metering of the compressed air.
  • the entire blow-off nozzle 1 can be swiveled by an angle of ⁇ 20 ° with respect to the vertical to the tape running direction with respect to a pivot point 32.
  • longitudinal grooves 12 are provided over the length of the blow-off nozzle 1, through which a guide band 11 (FIG. 2) can be moved.
  • the guide belt 11 is a flexible steel belt which is guided in the area outside the blow-off nozzle in a cylindrical body 13 which is attached laterally to the blow-off nozzle 1 and is coupled to a motor drive at its end remote from the blow-off nozzle 1.
  • a cylindrical body 13 is provided on each side of the blow-off nozzle 1, each carrying a guide band 11, so that there is a symmetrical arrangement.
  • a slide block 17 and an edge nozzle 21 each are fastened, which are thus displaceable along with the respective guide belt 11 along the blow-off nozzle 1.
  • the slide block 17 forms the separating surface between the area of the nozzle gap released for the compressed air outlet and the area of the nozzle gap length covered by the guide band 11 for the compressed air and prevents the compressed air from passing from the open, band-side inner area into the hidden area.
  • the position of the guide belt 11 is adjusted so that the edge nozzles 21 are always directed towards the area of the edges of the metal belt 33 and that each of the two open inner areas covers approximately half of the metal belt width.
  • the edge blow-off air is fed to the edge nozzles 21 through a flexible steel hose 24 which is arranged on the guide belt 11. This is connected on the one hand to the area of the edge nozzle 21 and on the other hand opens into the cylindrical body 13 at the edge of the blow-off nozzle 1 and is connected there to the compressed air source 34.
  • the slide block 17 has a dirt-repellent plate 20 that is aligned with the nozzle gap 2 and engages in it.
  • the dirt-repellent plate 20 is moved for the purpose of cleaning the nozzle gap from residues of the coating agent in a cleaning stroke over the contaminated area of the nozzle gap. This cleaning stroke takes place e.g. during the changeover from one metal strip to the next.
  • the dirt-repellent plate 20 is brought by the drive 13 by means of the guide belt 11 in a rapid gear to the center of the device and back into the working position.
  • the maximum available pressure of the edge blow-off air 22 is applied to the edge nozzles 21.
  • Fig. 4 shows the arrangement shown according to the first embodiment in connection with the external electronic components provided for automatic operation.
  • the motor drive located in the cylindrical body 13 is controlled by a computer 16, which receives a sensor signal from the sensors 15 corresponding to the width of the metal strip 33 passed by them.
  • a computer 16 which receives a sensor signal from the sensors 15 corresponding to the width of the metal strip 33 passed by them.
  • sensors 25 are provided, which measure the layer thickness of the metal strip 33 provided with the coating agent and also feed this measured value into the computer 16.
  • the amount of blow-off air 18 supplied to the effective nozzle gap 2 is set on the one hand via a control valve 27 and on the other hand the edge blow-off air 22 for the edge nozzles 21 is set via a control valve 26.
  • the set amount of blow-off air enters the blow-off nozzle 1 via a tubular opening on the outer jacket of the cylindrical body 13 and is guided from there through the interior of the blow-off nozzle 1 into the compressed air space a shown in FIG. 1. Because the filter disk 8 is arranged over the entire length of the blow-off nozzle 1 in front of the nozzle gap 2, swirling of the compressed air in the region of the nozzle gap is prevented, since the porous filter disk offers resistance to the compressed air provided, so that pressure differences along the nozzle gap are equalized .
  • the amount of edge blow-off air 22 set by the control valve 26 is fed to the flexible hose 24 and thus to the edge nozzles 21 via a corresponding opening on the cover side of the cylindrical body 13.
  • FIG. 5 shows a second exemplary embodiment according to the invention, which differs from the first exemplary embodiment only as a result separates that on the side facing the coating agent bath 31 of the base body 5 of the blow-off nozzle 1 additionally has a heat protection plate 29 with an intermediate layer 30 insulating it against the base body 5.
  • FIG. 6 A third exemplary embodiment of the invention is shown in FIG. 6, which differs from the first exemplary embodiment only in that a protective plate 28 is provided in the area of the outer space around the blow-off nozzle 1 which is not covered by the metal strip 33. This avoids that dirt particles caused by the flow of compressed air are drawn from the environment into the area of the strip 33 to be coated and can thereby contaminate it. Furthermore, this mudguard 28 also serves to reduce the sound emission caused by the air flow and to transfer the heat from the coating agent bath 31 to the blow-off nozzle 1.

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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)
  • Coating With Molten Metal (AREA)
  • Coating Apparatus (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Details Or Accessories Of Spraying Plant Or Apparatus (AREA)

Claims (13)

1. Dispositif pour faire disparaître en soufflant la matière de placage superflue lors du placage bilatéral en continu d'un feuillard métallique, en particulier lors de la galvanisation d'un feuillard d'acier, avec une buse d'évacuation par soufflage (1) disposée parallèle à la surface du feuillard métallique (33), actionnée à l'air comprimé, dont la fente de buse (2) est formée par deux lèvres de buse (4) mobiles l'une par rapport à l'autre, la longueur de fente de la buse d'évacuation par soufflage (1) étant plus grande que la largeur du feuillard métallique, caractérisé par le fait qu'on prévoit un élément de recouvrement (1) guidé par la buse d'évacuation par soufflage (1), par lequel l'amenée d'air à la fente de buse (2) peut être recouverte dans la région à l'extérieur de la longueur de fente ajustée respectivement à la largeur du feuillard métallique.
2. Dispositif selon la revendication 1, avec une buse d'arête (21) agissant sur la région d'arête du feuillard métallique, caractérisé par le fait que bêtement de recouvrement est une bande de guidage (11) flexible, qui peut être déplacée le long d'une rainure longitudinale (12) dans la région de la fente de buse, et qu'un bloc coulissant (17) et la buse d'arête (21) sont disposés sur la face de celle-ce limitant la longueur de fente en direction de l'arête du feuillard métallique.
3. Dispositif selon la revendication 1 ou 2, caractérisé par le fait que la bande de guidage (11) peut être déplacée par un entraînement motorisé agissant comme moteur de déplacement pour le réglage automatique de la longueur de fente, qui est relié à la sortie d'un calculateur (16) dont le signal d'entrée est formé par des capteurs de mesure (15) mesurant la largeur du feuillard métallique.
4. Dispositif selon la revendication 1 ou 2, caractérisé par le fait que le bloc coulissant (17) logé dans la région du point de liaison entre la bande de guidage (11) et la buse d'arête (21) présente une tôle déflectrice de saleté (20) alignée avec la fente de buse (2) et en prise dans celle-ci, pour le nettoyage de la fente de buse (2) de restes de matière de placage.
5. Dispositif selon l'une des revendications 1 à 4, caractérisé par le fait qu'un tuyau métallique flexible (24) ist disposé sur la bande de guidage (11), par lequel se produit l'amenée d'air comprimé aux buses d'arête (21).
6. Dispositif selon l'une des revendications 1 à 5, caractérisé par le fait que la largeur de la fente de buse (2) déterminée par l'écartement des lèvres de buse (4) peut être réglée en continu par une vis de réglage (7) accessible depuis l'extérieur du dispositif.
7. Dispositif selon la revendication 6, caractérisé par le fait que plusieurs vis de réglage (7) sont prévues le long de la longueur de la fente de buse, par lesquelles le profil d'intensité du soufflage d'air comprimé d'évacuation peut être modifié.
8. Dispositif selon l'une des revendications 1 à 7, caractérisé par le fait qu'une régulation de l'air comprimé est prévue de telle manière que par l'intermédiaire de valves de réglage (26) pour l'air d'évacuation par soufflage d'arête ou de valves de réglage (27) pour l'air de buse d'évacuation par soufflage reliées à la sortie du calculateur (16), les portions quantitatives d'air comprimé envoyées aux buses d'arête (21) ou aux buses d'évacuation par soufflage (1) peuvent être modifiées par les signaux des capteurs (25) mesurant l'épaisseur de couche du feuillard métallique qui sont envoyés au calculateur (16).
9. Dispositif selon l'une des revendications précédentes, caractérisé par le fait qu'une pièce de filtration (8) en matériau poreux est prévue dans toute la région de la longeur de la buse d'évacuation par soufflage (1) entre la fente de buse (2) et la vis de réglage (7).
10. Dispositif selon la revendication 9, caractérisé par le fait que la pièce de filtration (8) est formée de bronze fritté avec une dimension de pores d'au moins 80/lm.
11. Dispositif selon l'une des revendications précédentes, caractérisé par le fait que la buse d'évacuation par soufflage (1) est entourée par une tôle de protection (28) couvrant la buse dans la région de l'espace extérieur non recouverte par la bande métallique.
12. Dispositif selon l'une des revendications précédentes, caractérisé par le fait que les parties de la buse d'évacuation par soufflage (1) tournées vers le bain de matière de placage (31) sont revêtues par un bouclier thermique (29, 30).
13. Procédé pour évacuer par soufflage la matière de placage superflue lors du placage en continu d'un feuillard métallique (33), en particulier lors de la galvanisation d'un feuillard d'acier, dans lequel chaque face du feuillard est soumise à une évacuation par soufflage au moyen respectivement d'une buse d'évacuation par soufflage (33) actionnée à l'air comprimé, la longueur de la fente de buse (2) formée par des lèvres de buse (4) mobiles l'une par rapport à l'autre est plus grande que la largeur du feuillard métallique, caractérisé par le fait que la région de la fente de buse (2) non nécessaire à l'évacuation par soufflage est recouverte par un élément de recouvrement (11) guidé par la buse d'évacuation par soufflage (1).
EP87108473A 1986-06-12 1987-06-11 Dispositif d'évacuation pour couvrir bilatéralement en continu un ruban à métaux Expired - Lifetime EP0249234B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87108473T ATE45390T1 (de) 1986-06-12 1987-06-11 Abblasvorrichtung zum kontinuierlichen beidseitigen beschichten von metallband.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3619805 1986-06-12
DE3619805 1986-06-12

Publications (3)

Publication Number Publication Date
EP0249234A1 EP0249234A1 (fr) 1987-12-16
EP0249234B1 true EP0249234B1 (fr) 1989-08-09
EP0249234B2 EP0249234B2 (fr) 1994-08-17

Family

ID=6302879

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87108473A Expired - Lifetime EP0249234B2 (fr) 1986-06-12 1987-06-11 Dispositif d'évacuation pour couvrir bilatéralement en continu un ruban à métaux

Country Status (4)

Country Link
EP (1) EP0249234B2 (fr)
AT (1) ATE45390T1 (fr)
DE (1) DE3760425D1 (fr)
ES (1) ES2009820T5 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006046797A1 (de) * 2006-09-29 2008-04-03 Josef Schiele Ohg Verfahren und Vorrichtung zur Bandbeschichtung von variablen Werkstücken in einer Vakuumbeschichtungsvorrichtung

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3704199A1 (de) * 1987-02-11 1988-08-25 Unitas Sa Duese zum abblasen kontinuierlich bewegter oberflaechen
DE4024229C1 (fr) * 1990-07-31 1991-07-18 Heinrich 4100 Duisburg De Pannenbecker
DE4208558C1 (en) * 1992-03-18 1993-03-11 Duma Konstruktionsbuero, 4100 Duisburg, De Removing excess coating material from steel strip - with compressed air from nozzle having gap formed by nozzle lips partly coverable by guide strip and using deflecting element for lateral deflection of air jet
DE4223343C1 (de) * 1992-07-16 1994-03-17 Duma Masch Anlagenbau Abblasvorrichtung
DE4306394C1 (de) * 1993-03-02 1994-04-21 Duma Masch Anlagenbau Abblasvorrichtung und Verfahren zum Abblasen von überflüssigem Beschichtungsmaterial
DE4300868C1 (de) * 1993-01-15 1994-03-17 Duma Masch Anlagenbau Beschichtungsvorrichtung
AUPO473297A0 (en) * 1997-01-22 1997-02-20 Industrial Automation Services Pty Ltd Coating thickness control
EP2140944A1 (fr) * 2008-07-03 2010-01-06 Linde AG Déflecteurs réglables pour essuyage au gaz
EP2631012B1 (fr) 2012-02-21 2014-10-29 Cockerill Maintenance & Ingenierie S.A. Système permettant de réduire la consommation de gaz de nettoyage dans une lame d'air
JP6220201B2 (ja) * 2013-09-19 2017-10-25 真人 稗田 めっき膜厚調整装置
CN110158013A (zh) * 2019-06-22 2019-08-23 徐州华正铸业有限公司 一种喷锌机的喷锌枪调节装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3469917D1 (en) * 1984-05-30 1988-04-21 Usinor Process and device for producing a galvanized steel sheet or strip not coated by pure zinc at at least one surface

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006046797A1 (de) * 2006-09-29 2008-04-03 Josef Schiele Ohg Verfahren und Vorrichtung zur Bandbeschichtung von variablen Werkstücken in einer Vakuumbeschichtungsvorrichtung

Also Published As

Publication number Publication date
ES2009820B3 (es) 1989-10-16
EP0249234A1 (fr) 1987-12-16
EP0249234B2 (fr) 1994-08-17
ES2009820T5 (es) 1995-08-16
DE3760425D1 (en) 1989-09-14
ATE45390T1 (de) 1989-08-15

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