EP0278373B1 - Gas-wiping nozzle for continuously moving surfaces - Google Patents
Gas-wiping nozzle for continuously moving surfaces Download PDFInfo
- Publication number
- EP0278373B1 EP0278373B1 EP88101512A EP88101512A EP0278373B1 EP 0278373 B1 EP0278373 B1 EP 0278373B1 EP 88101512 A EP88101512 A EP 88101512A EP 88101512 A EP88101512 A EP 88101512A EP 0278373 B1 EP0278373 B1 EP 0278373B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nozzle
- gas
- slot
- covering elements
- mouthpiece
- 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 - Lifetime
Links
- 239000011248 coating agent Substances 0.000 claims abstract description 18
- 238000000576 coating method Methods 0.000 claims abstract description 15
- 239000002184 metal Substances 0.000 claims description 3
- 238000005422 blasting Methods 0.000 claims 2
- 239000007788 liquid Substances 0.000 claims 1
- 230000009969 flowable effect Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 5
- 238000007664 blowing Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009420 retrofitting Methods 0.000 description 1
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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
Definitions
- the invention relates to a coating device with the features of the preamble of patent claim 1.
- nozzles are arranged on both sides of the strip sheet running out of the coating bath, the nozzle slots of which extend over the full working width of the device, the nozzle slots of the opposing nozzles lying opposite one another. They are covered against each other by the band plate running between them.
- strip material is processed, the width of which is less than the maximum working width of the device, gas is blown out of the opposing nozzles on at least one side of the strip material, which gas is ineffective for stripping or blowing off coating agents from the surfaces of the strip material.
- This not only leads to unnecessary gas consumption and thus energy expenditure for gas production, but also to turbulence in the gas streams that meet the strip material.
- the unnecessary gas consumption also plays an economic role for cost reasons. This is all the more true since coating devices for strip material can rarely be used over the full working width, but the strip to be coated, such as strip plate, often fluctuate in width.
- Such a coating device is known for example from US-A 3,941,086 and from FR-A 2 208 003 by the same applicant.
- the outlet width of the nozzle slot can be adapted to the width of the material passing through, namely, that two screens are provided, which are arranged on each side of the nozzle slot so that it can move along the nozzle slot.
- the screens are profiled so that they are adapted to the upper edge and to the lower edge of the nozzle slot, which form the guide for the screens.
- a disadvantage of this type of orifice plate is that the position within the nozzle slot can be determined directly only with difficulty. If the diaphragm drive is not automatically monitored, it cannot be quickly adapted to the width of the sheet material passing through.
- a coating device is also known from the subsequently published EP-A 0 249 234, in which the width of the nozzle slot is variable.
- a cover element in the form of a guide band is provided which is guided by the drain nozzle, grooves being provided in the drain nozzle for the purpose of this guide.
- the coating device in the area of the nozzle slot in a special way, namely to provide it with grooves, which makes it difficult to retrofit the coating device, it is also necessary to ensure that an additional drive and control mechanism is provided the guide band is in the desired position.
- the cover elements can be designed, for example, as plates or as flexible sheets and can be kept in stock in different widths.
- the working width of the nozzle gap or of the nozzle slot is limited in a simple manner or adjusted to the desired working area by placing simple platelets at the points from which a gas is to escape, in particular in the area immediately next to the side edges of the strip material to be stripped or puts on sheets, which can also be variable in size.
- These relatively light cover elements which are loosely placed on the generally vertical or approximately vertical face of the mouthpiece of the nozzle, adhere to the nozzle mouthpiece due to the suction effect emanating from the gas blown out of the nozzle and cover the slot at the points at which no gas should escape .
- cover elements such as plates, sheets or the like are expedient. chosen so wide that the same gas can escape from the slot on both sides, because in this way the gas flowing around the ends of the cover elements causes a suction effect, which the plate, sheet or the like. holds with sufficient strength on the nozzle slot and thus covers it in the desired manner.
- the cover elements provided according to the invention drop off, but this does not play an important economic role because the cover elements can be produced inexpensively and, accordingly, can also be kept in large numbers in stock.
- the cover elements can also be captively attached to a guide.
- the cover elements to be provided according to the invention are easy to install since they can be designed extremely easily. They can also be conveniently adjusted and readjusted while the system is running.
- the plates, leaves or the like are expedient. dimensioned so that they protrude at least on the top over the mouthpiece, where they are sucked in by the pressure prevailing in the nozzle. They can thus be easily gripped or held and, accordingly, can be attached and readjusted particularly advantageously.
- the nozzle (1) has a hollow base body (2) of approximately teardrop-shaped cross section, the inner cavity (3) of which can be connected to a compressed gas source (not shown), so that gas under pressure flows into the cavity (3) and is evenly distributed therein .
- the base body (2) is equipped with a narrowed mouthpiece (4), the flat end face (5) of which contains a slot (6) extending over the entire length of the nozzle (1), from which the slot (3) of the base body (2) located, pressurized gas can flow out in the form of a narrow curtain-like jet.
- the width of the slot (6) is selected so that more pressurized gas can flow into the cavity (3) than can flow out of the slot (6), the gas located in the cavity (3) will extend over the entire length of the slot (6 ) blown out with uniform thickness and with the desired nozzle effect.
- small cover plates (7) are placed on the end face (5) of the mouthpiece (4), which, according to FIG. 1, have the upper edge (7a) over the end face (5 ) protrude from the mouthpiece (4) so that they can be comfortably gripped and positioned and / or moved or removed by hand.
- FIG. 2 shows that the plates (7) are held by the gas flowing out of the slot (6) on the end face (5) of the mouthpiece (4).
- the arrows (8) drawn in FIG. 2 symbolize the gas flow. It can be seen that the gas flow in the edge region of a placed plate (7) loses its normally straight direction and is deflected more or less strongly when flowing around the side edges (7b) of the plate (7), and forms vortices (8a) which form the plate (7) on the face (5) of the mouthpiece (4).
- platelets (7) in the edge region of the working width of the nozzle (1) are expedient if no blowing action is desired there. In this way the gas consumption can be reduced, just as undesired blowing effects can be avoided where the nozzle is not supposed to work.
- the platelets (7) are each fastened to a slide (10) which is mounted on a rod (11) running parallel to the nozzle (1) in the longitudinal direction of the rod and thus along the nozzle slot (6 ) are movable.
- connection between the plate (7) and the respective carriage (10) is, for example, by a wire (12) or another connecting element, if necessary. also a thread or the like. produced.
- the plates (7) can be adjusted particularly well because you do not have to reach close to the nozzle slot (6) by hand. In addition, the plates (7) do not fall off even when the nozzle is at a standstill and are therefore immediately available again when the operation starts again.
- two nozzles (1a and 1b) lying opposite one another are provided, the slots (6) of which lie opposite one another at a short distance.
- Bow-like plates (13) are provided which hang on a carriage (14) which can be moved on parallel rods (15 and 16).
- a bracket (17) is used to connect the plate (13) and the carriage (14).
- the saddle-like plate (13) has two legs (13a and 13b) which lie against the opposing nozzle slots (6) of the nozzles (1a and 1b) when they are working.
- the plates (7 and 13) are attached to a holder in the embodiments according to FIGS. 3 and 4, they are in the same way on the end face (5) of the mouthpiece (4 ) held the nozzles, as explained above in connection with FIGS. 1 and 2.
Abstract
Description
Die Erfindung betrifft eine Beschichtungsvorrichtung mit den Merkmalen des Oberbegriffs von Patentanspruch 1.The invention relates to a coating device with the features of the preamble of patent claim 1.
Bei bekannten Beschichtungsanlagen zum Herstellen von verzinktem Bandblech sind beidseits des aus dem Beschichtungsbad herauslaufenden Bandbleches Düsen angeordnet, deren Düsenschlitze sich über die volle Arbeitsbreite der Vorrichtung erstrecken, wobei die Düsenschlitze der einander gegenüberliegenden Düsen einander gegenüber liegen. Sie werden von dem zwischen sie hindurchlaufenden Bandblech gegeneinander abgedeckt.In known coating systems for the production of galvanized strip sheet, nozzles are arranged on both sides of the strip sheet running out of the coating bath, the nozzle slots of which extend over the full working width of the device, the nozzle slots of the opposing nozzles lying opposite one another. They are covered against each other by the band plate running between them.
Wird Bandmaterial verarbeitet, dessen Breite geringer als die maximale Arbeitsbreite der Vorrichtung ist, wird wenigstens auf einer Seite des Bandmaterials aus den einander gegenüberliegenden Düsen Gas ausgeblasen, das für das Abstreifen bzw. Abblasen von Beschichtungsmittel von den Oberflächen des Bandmaterials wirkungslos ist. Das führt nicht nur zu einem unnötigen Gasverbrauch und damit Energieaufwand für die Gasförderung, sondern auch zu Verwirbelungen der neben dem Bandmaterial aufeinandertreffenden Gasströme. Wird mit einem anderen Gas als Luft gearbeitet, spielt der überflüssige Gasverbrauch auch aus Kostengründen wirtschaftlich eine Rolle. Dies gilt um so mehr, als Beschichtungsvorrichtungen für Bandmaterial selten auf der vollen Arbeitsbreite genutzt werden können, die zu beschichtenden Bänder wie Bandblech aber in ihrer Breite häufig schwanken.If strip material is processed, the width of which is less than the maximum working width of the device, gas is blown out of the opposing nozzles on at least one side of the strip material, which gas is ineffective for stripping or blowing off coating agents from the surfaces of the strip material. This not only leads to unnecessary gas consumption and thus energy expenditure for gas production, but also to turbulence in the gas streams that meet the strip material. When working with a gas other than air, the unnecessary gas consumption also plays an economic role for cost reasons. This is all the more true since coating devices for strip material can rarely be used over the full working width, but the strip to be coated, such as strip plate, often fluctuate in width.
Eine derartige Beschichtungsvorrichtung ist beispielsweise aus der US-A 3,941,086 sowie aus der FR-A 2 208 003 desselben Anmelders bekannt. Auch bei dieser bekannten Vorrichtung kann die Austrittsbreite des Düsenschlitzes an die Breite des durchlaufenden Materials angepaßt werden, indem nämlich zwei Blenden vorgesehen sind, die auf jeder Seite des Düsenschlitzes in diesem längs des Düsenschlitzes bewegbar angeordnet sind. Die Blenden sind dabei profiliert, so daß sie an die Oberkante und an die Unterkante des Düsenschlitzes angepaßt sind, welche die Führung für die Blenden bilden. Nachteilig bei dieser Art von Blenden ist es, daß die Position innerhalb des Düsenschlitzes direkt nur schwer ermittelt werden kann. Wenn der Blendenantrieb nicht automatisch überwacht wird, kann eine schnelle Anpassung an die Breite des durchlaufenden Blechmaterials nicht erfolgen.Such a coating device is known for example from US-A 3,941,086 and from FR-A 2 208 003 by the same applicant. In this known device too, the outlet width of the nozzle slot can be adapted to the width of the material passing through, namely, that two screens are provided, which are arranged on each side of the nozzle slot so that it can move along the nozzle slot. The screens are profiled so that they are adapted to the upper edge and to the lower edge of the nozzle slot, which form the guide for the screens. A disadvantage of this type of orifice plate is that the position within the nozzle slot can be determined directly only with difficulty. If the diaphragm drive is not automatically monitored, it cannot be quickly adapted to the width of the sheet material passing through.
Aus der US-A 3,687,103 ist es bekannt, den Düsenschlitz mit jeweils zwei den Schlitz abdeckenden plattenförmigen Blenden zu versehen, die von der Stirnseite her an den Düsenschlitz angestellt sind, so daß jederzeit deren tatsächliche Lage erkennbar ist. Die Blenden hängen jeweils auf einem beweglichen Trägerarm, der je mit einer auf der Blechbandkante rollenden Abtasterolle verbunden ist. Dieser Steuermechanismus ermöglicht eine automatische Anpassung der Breite des Düsenschlitzes an das durchlaufende Material, jedoch sind für diesen aufwendige Antriebs- und Steuereinrichtungen erforderlich.From US-A 3,687,103 it is known to provide the nozzle slot with two plate-shaped diaphragms covering the slot, which are positioned from the end face of the nozzle slot, so that their actual position can be seen at any time. The screens each hang on a movable support arm, each of which is connected to a scanning roller that rolls on the sheet metal strip edge. This control mechanism enables the width of the nozzle slot to be automatically adapted to the material passing through, but complex drive and control devices are required for this.
Auch aus der nachveröffentlichten EP-A 0 249 234 ist eine Beschichtungsvorrichtung bekannt, bei der der Düsenschlitz in seiner Breite variabel gestaltet ist. Dazu ist ein Abdeckelement in Form eines Führungsbandes vorgesehen, das von der Ablaßdüse geführt wird, wobei zum Zwecke dieser Führung in der Ablaßdüse Nuten vorgesehen sind. Abgesehen davon, daß es erforderlich ist, die Beschichtungsvorrichtung im Bereich des Düsenschlitzes auf eine besondere Weise auszugestalten, nämlich mit Nuten zu versehen, was ein Nachrüsten der Beschichtungsvorrichtung erschwert, ist es auch hierfür erforderlich, über einen zusätzlich vorzusehenden Antriebs- und Kontrollmechanismus sicherzustellen, daß das Führungsband in der gewünschten Position ist.A coating device is also known from the subsequently published EP-A 0 249 234, in which the width of the nozzle slot is variable. For this purpose, a cover element in the form of a guide band is provided which is guided by the drain nozzle, grooves being provided in the drain nozzle for the purpose of this guide. Apart from the fact that it is necessary to design the coating device in the area of the nozzle slot in a special way, namely to provide it with grooves, which makes it difficult to retrofit the coating device, it is also necessary to ensure that an additional drive and control mechanism is provided the guide band is in the desired position.
Es ist die Aufgabe der Erfindung, eine Beschichtungsvorrichtung zu schaffen, bei der mit einfachen Mitteln die Möglichkeit besteht, die zum Abstreifen bzw. Abblasen von überschüssigem, fließfähigem Beschichtungsmittel von kontinuierlich bewegten Oberflächen wie Bandblech verwendeten Düsen auf die jeweils erforderliche Arbeitsbreite einstellen zu können, wobei dieses schnell und insbesondere auch von Hand geschehen soll und wobei auch für bereits installierte Beschichtungsvorrichtungen die Möglichkeit der Nachrüstung gegeben sein soll.It is the object of the invention to provide a coating device in which there is the possibility, with simple means, of adjusting the nozzles used for stripping or blowing off excess, flowable coating agent from continuously moving surfaces such as strip metal sheet to the respectively required working width, whereby this should be done quickly and in particular by hand, and the possibility of retrofitting should also be provided for already installed coating devices.
Diese Aufgabe wird bei einer Beschichtungsvorrichtung der eingangs genannten Gattung mit den Merkmalen des Kennzeichens von Patentanspruch 1 gelöst. Vorteilhafte Ausgestaltungen sind Gegenstand der Unteransprüche.This object is achieved in a coating device of the type mentioned with the features of the characterizing part of patent claim 1. Advantageous refinements are the subject of the dependent claims.
Die Abdeckelemente können beispielsweise als Plättchen oder auch als flexible Blätter ausgebildet sein und in unterschiedlicher Breite auf Vorrat gehalten werden.The cover elements can be designed, for example, as plates or as flexible sheets and can be kept in stock in different widths.
Erfindungsgemäß wird die Arbeitsbreite des Düsenspaltes bzw. des Düsenschlitzes in einfacher Weise dadurch begrenzt bzw. auf den gewünschten Arbeitsbereich eingestellt, daß man an den Stellen, aus denen ein Gas austreten soll, nämlich insbesondere im Bereich unmittelbar neben den Seitenkanten des abzustreifenden Bandmaterials, einfache Plättchen oder Blätter auflegt, die in ihrer Größe auch variabel sein können. Diese lose auf die im allgemeinen senkrecht oder etwa senkrecht stehende Stirnseite des Mundstückes der Düse aufgelegten verhältnismäßig leichten Abdeckelemente haften aufgrund der von dem aus der Düse ausgeblasenen Gas ausgehenden Saugwirkung auf dem Düsenmundstück und decken den Schlitz an den Stellen ab, an denen kein Gas austreten soll.According to the invention, the working width of the nozzle gap or of the nozzle slot is limited in a simple manner or adjusted to the desired working area by placing simple platelets at the points from which a gas is to escape, in particular in the area immediately next to the side edges of the strip material to be stripped or puts on sheets, which can also be variable in size. These relatively light cover elements, which are loosely placed on the generally vertical or approximately vertical face of the mouthpiece of the nozzle, adhere to the nozzle mouthpiece due to the suction effect emanating from the gas blown out of the nozzle and cover the slot at the points at which no gas should escape .
Zweckmäßig sind die Abdeckelemente wie Plättchen, Blätter od.dgl. so breit gewählt, daß an beiden Seiten derselben Gas aus dem Schlitz austreten kann, weil auf diese Weise das um die Enden der Abdeckelemente herumströmende Gas eine Saugwirkung hervorruft, welche das Plättchen, Blatt od.dgl. mit ausreichender Festigkeit auf dem Düsenschlitz hält und diesen damit in der gewünschten Weise abdeckt.The cover elements such as plates, sheets or the like are expedient. chosen so wide that the same gas can escape from the slot on both sides, because in this way the gas flowing around the ends of the cover elements causes a suction effect, which the plate, sheet or the like. holds with sufficient strength on the nozzle slot and thus covers it in the desired manner.
Bei Arbeitsunterbrechung der Düse fallen die erfindungsgemäß vorgesehenen Abdeckelemente zwar ab, jedoch spielt dies wirtschaftlich keine bedeutende Rolle, weil die Abdeckelemente preiswert hergestellt und dementsprechend auch in großer Anzahl auf Lager gehalten werden können. Die Abdeckelemente können aber auch unverlierbar an einer Führung angehängt sein.When the nozzle is interrupted, the cover elements provided according to the invention drop off, but this does not play an important economic role because the cover elements can be produced inexpensively and, accordingly, can also be kept in large numbers in stock. The cover elements can also be captively attached to a guide.
Die erfindungsgemäß vorzuseheneden Abdeckelemente sind, da sie äußerst leicht ausgebildet werden können, problemlos zu installieren. Sie können auch während des Laufes der Anlage bequem einjustiert und auch nachjustiert werden.The cover elements to be provided according to the invention are easy to install since they can be designed extremely easily. They can also be conveniently adjusted and readjusted while the system is running.
Zweckmäßig sind die Plättchen, Blätter od.dgl. so dimensioniert, daß sie zumindest an der Oberseite über das Mundstück, an dem sie vom in der Düse herrschenden Druck festgesaugt werden, überstehen. Sie lassen sich somit leicht ergreifen oder halten und dementsprechend besonders vorteilhaft anbringen und auch nachjustieren.The plates, leaves or the like are expedient. dimensioned so that they protrude at least on the top over the mouthpiece, where they are sucked in by the pressure prevailing in the nozzle. They can thus be easily gripped or held and, accordingly, can be attached and readjusted particularly advantageously.
In der Zeichnung sind Ausführungsbeispiele der erfindungsgemäßen Düse dargestellt, und zwar zeigt
- Figur 1
- eine schaubildliche Ansicht der Düse mit auf deren Mundstück aufgesetzten Abdeckelementen,
Figur 2- einen Teilschnitt durch das Mundstück der Düse im Bereich eines aufgesetzten Abdeckelementes,
Figur 3- eine schaubildliche Ansicht einer gegenüber Fig. 1 abgewandelten Ausführungsform und
- Figur 4
- eine schaubildliche Ansicht einer dritten Ausführungsform.
- Figure 1
- 2 shows a perspective view of the nozzle with cover elements placed on its mouthpiece,
- Figure 2
- a partial section through the mouthpiece of the nozzle in the area of an attached cover element,
- Figure 3
- a perspective view of a modified from Fig. 1 embodiment and
- Figure 4
- a perspective view of a third embodiment.
Die Düse (1) hat einen hohlen Grundkörper (2) etwa tropfenförmigen Querschnittes, dessen innerer Hohlraum (3) an eine nicht dargestellte Druckgasquelle angeschlossen werden kann, so daß unter Druck stehendes Gas in den Hohlraum (3) strömt und in diesem sich gleichmäßig verteilt. An der Vorderseite ist der Grundkörper (2) mit einem verengten Mundstück (4) ausgestattet, dessen ebene Stirnseite (5) einen sich über die gesamte Länge der Düse (1) erstreckenden Schlitz (6) enthält, aus dem das im Hohlraum (3) des Grundkörpers (2) befindliche, unter Druck stehende Gas in Form eines schmalen vorhangartigen Strahles ausströmen kann. Da die Weite des Schlitzes (6) so gewählt ist, daß in den Hohlraum (3) mehr unter Druck stehendes Gas nachströmen als aus dem Schlitz (6) ausströmen kann, wird das im Hohlraum (3) befindliche Gas über die gesamte Länge des Schlitzes (6) mit gleichmäßiger Stärke und mit dem gewünschten Düseneffekt ausgeblasen.The nozzle (1) has a hollow base body (2) of approximately teardrop-shaped cross section, the inner cavity (3) of which can be connected to a compressed gas source (not shown), so that gas under pressure flows into the cavity (3) and is evenly distributed therein . On the front side, the base body (2) is equipped with a narrowed mouthpiece (4), the flat end face (5) of which contains a slot (6) extending over the entire length of the nozzle (1), from which the slot (3) of the base body (2) located, pressurized gas can flow out in the form of a narrow curtain-like jet. Since the The width of the slot (6) is selected so that more pressurized gas can flow into the cavity (3) than can flow out of the slot (6), the gas located in the cavity (3) will extend over the entire length of the slot (6 ) blown out with uniform thickness and with the desired nozzle effect.
An Stellen, an welchen aus dem Schlitz (6) kein Gas ausströmen soll, sind an die Stirnseite (5) des Mundstückes (4) kleine Abdeckplättchen (7) gelegt, die gemäß Figur 1 mit ihrer Oberkante (7a) über die Stirnseite (5) des Mundstückes (4) überstehen, so daß sie von Hand bequem erfaßt und positioniert und/oder versetzt bzw. entfernt werden können.At places where no gas should flow out of the slot (6), small cover plates (7) are placed on the end face (5) of the mouthpiece (4), which, according to FIG. 1, have the upper edge (7a) over the end face (5 ) protrude from the mouthpiece (4) so that they can be comfortably gripped and positioned and / or moved or removed by hand.
Figur 2 zeigt, daß die Plättchen (7) von dem aus dem Schlitz (6) ausströmenden Gas an der Stirnseite (5) des Mundstückes (4) gehalten werden. Die in Figur 2 eingezeichneten Pfeile (8) symbolisieren die Gasströmung. Es ist erkennbar, daß die Gasströmung im Kantenbereich eines aufgelegten Plättchens (7) ihre normalerweise grade Richtung verliert und beim Umströmen der Seitenkanten (7b) des Plättchens (7) mehr oder weniger stark umgelenkt wird, und Wirbel (8a) bildet, welche das Plättchen (7) auf die Stirnseite (5) des Mundstückes (4) drücken. Dadurch ergibt sich überraschenderweise ein Andruckeffekt des verhältnismäßig leichten Plättchens (7) gegen die Stirnseite (5) des Mundstückes (4), der ausreicht, um das Plättchen (7) am Mundstück (4) zu halten, so daß vom Plättchen (7) gewisse Bereiche des Schlitzes (6) abgedeckt werden können.Figure 2 shows that the plates (7) are held by the gas flowing out of the slot (6) on the end face (5) of the mouthpiece (4). The arrows (8) drawn in FIG. 2 symbolize the gas flow. It can be seen that the gas flow in the edge region of a placed plate (7) loses its normally straight direction and is deflected more or less strongly when flowing around the side edges (7b) of the plate (7), and forms vortices (8a) which form the plate (7) on the face (5) of the mouthpiece (4). This surprisingly results in a pressure effect of the relatively light plate (7) against the end face (5) of the mouthpiece (4), which is sufficient to hold the plate (7) on the mouthpiece (4), so that certain of the plate (7) Areas of the slot (6) can be covered.
Beispielsweise sind Plättchen (7) im Randbereich der Arbeitsbreite der Düse (1) zweckmäßig, wenn dort keine Blaswirkung erwünscht ist. Auf diese Weise läßt sich der Gasverbrauch reduzieren, ebenso wie unerwünschte Blaswirkungen dort vermieden werden können, wo die Düse nicht arbeiten soll.For example, platelets (7) in the edge region of the working width of the nozzle (1) are expedient if no blowing action is desired there. In this way the gas consumption can be reduced, just as undesired blowing effects can be avoided where the nozzle is not supposed to work.
Bei der in Figur 3 dargestellten Ausführungsform sind die Plättchen (7) jeweils an einem Schlitten (10) befestigt, welche auf einer oberhalb der Düse (1) parallel zu dieser verlaufenden Stange (11) in Längsrichtung der Stange und somit entlang dem Düsenschlitz (6) verschiebbar sind.In the embodiment shown in FIG. 3, the platelets (7) are each fastened to a slide (10) which is mounted on a rod (11) running parallel to the nozzle (1) in the longitudinal direction of the rod and thus along the nozzle slot (6 ) are movable.
Die Verbindung zwischen den Plättchen (7) und dem jeweiligen Schlitten (10) wird beispielsweise von einem Draht (12) oder einem anderen Verbindungselement, ggfls. auch einem Faden od.dgl. hergestellt.The connection between the plate (7) and the respective carriage (10) is, for example, by a wire (12) or another connecting element, if necessary. also a thread or the like. produced.
Bei dieser Ausführungsform lassen sich die Plättchen (7) besonders gut verstellen, weil man mit der Hand nicht in die Nähe des Düsenschlitzes (6) reichen muß. Hinzu kommt, daß die Plättchen (7) auch bei Stillstandszeiten der Düse nicht herabfallen und somit bei erneutem Betriebsbeginn unmittelbar wieder zur Verfügung stehen.In this embodiment, the plates (7) can be adjusted particularly well because you do not have to reach close to the nozzle slot (6) by hand. In addition, the plates (7) do not fall off even when the nozzle is at a standstill and are therefore immediately available again when the operation starts again.
Bei der Ausführungsform gemäß Figur 4 sind zwei einander gegenüberliegende Düsen (1a und 1b) vorgesehen, deren Schlitze (6) einander in geringem Abstand gegenüberliegen. Es sind bügelartige Plättchen (13) vorgesehen, die an einem Schlitten (14) hängen, der auf parallelen Stangen (15 und 16) verschiebbar ist. Ein Bügel (17) dient zur Verbindung zwischen den Plättchen (13) und dem Schlitten (14).In the embodiment according to FIG. 4, two nozzles (1a and 1b) lying opposite one another are provided, the slots (6) of which lie opposite one another at a short distance. Bow-like plates (13) are provided which hang on a carriage (14) which can be moved on parallel rods (15 and 16). A bracket (17) is used to connect the plate (13) and the carriage (14).
Das sattelartig ausgebildete Plättchen (13) hat zwei Schenkel (13a und 13b), welche sich an die einander gegenüberliegenden Düsenschlitze (6) der Düsen (1a und 1b) legen, wenn diese arbeiten.The saddle-like plate (13) has two legs (13a and 13b) which lie against the opposing nozzle slots (6) of the nozzles (1a and 1b) when they are working.
Obwohl bei den Ausführungsformen gemäß Fig. 3 und 4 die Plättchen (7 bzw. 13) an einer Halterung angebracht sind, werden sie im Betrieb der betreffenden Düsen (1 bzw. 1a) in gleicher Weise an der Stirnseite (5) des Mundstückes (4) der Düsen gehalten, wie oben in Verbindung mit Fig. 1 und 2 erläutert.Although the plates (7 and 13) are attached to a holder in the embodiments according to FIGS. 3 and 4, they are in the same way on the end face (5) of the mouthpiece (4 ) held the nozzles, as explained above in connection with FIGS. 1 and 2.
Claims (5)
- Coating apparatus with a nozzle for blasting off or wiping off excess liquid coating medium or the like from continuously moving surfaces, for example of galvanised strip sheet metal, with a hollow basic body extending over the whole width of the coating apparatus in which compressed gas which is to be used for blasting can be distributed, and with a longitudinally extending mouthpiece extending over the length of the basic body and containing in a flat face a nozzle slot from which the gas is blown,
characterised in that for limiting the delivery width of the nozzle slot (6) covering elements (7) are laid on the face of the mouthpiece (4), loosely applied from the face side. - Apparatus according to claim 1, characterised in that the covering elements (7) are in the form of small plates.
- Apparatus according to claim 1, characterised in that the covering elements (7) are in the form of flexible leaves.
- Apparatus according to one of claims 1 to 3, characterised in that the covering elements (7;13) are suspended on a guide (11;15,16) extending parallel to the nozzle (1).
- Apparatus according to claim 4, characterised in that the covering elements (13) are of doubled form for two mutually opposed nozzles (1a and 1b).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT88101512T ATE78878T1 (en) | 1987-02-11 | 1988-02-03 | NOZZLE FOR BLOWING OFF CONTINUOUSLY MOVING SURFACES. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19873704199 DE3704199A1 (en) | 1987-02-11 | 1987-02-11 | NOZZLE FOR BLOWING CONTINUOUSLY MOVING SURFACES |
| DE3704199 | 1987-02-11 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0278373A2 EP0278373A2 (en) | 1988-08-17 |
| EP0278373A3 EP0278373A3 (en) | 1989-03-15 |
| EP0278373B1 true EP0278373B1 (en) | 1992-07-29 |
Family
ID=6320737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP88101512A Expired - Lifetime EP0278373B1 (en) | 1987-02-11 | 1988-02-03 | Gas-wiping nozzle for continuously moving surfaces |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0278373B1 (en) |
| AT (1) | ATE78878T1 (en) |
| DE (2) | DE3704199A1 (en) |
| ES (1) | ES2033945T3 (en) |
| GR (1) | GR3005694T3 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT393237B (en) * | 1989-04-11 | 1991-09-10 | Lisec Peter | NOZZLE FOR DRYING GLASS PANELS |
| DE19707157B4 (en) * | 1997-02-22 | 2006-04-06 | Weitmann & Konrad Gmbh & Co Kg | Device for dusting moving flat products |
| DE10245074A1 (en) * | 2002-09-27 | 2004-04-01 | Voith Paper Patent Gmbh | Doctor unit wipes off or equalises coating dye applied on running paper or board and features counter pressure unit, which exerts pressure on doctor element at height of pressure gap |
| EP2140944A1 (en) * | 2008-07-03 | 2010-01-06 | Linde AG | Adjustable baffles for gas wiping |
| CN102527588A (en) * | 2010-12-31 | 2012-07-04 | 深圳市海太阳实业有限公司 | Edge width adjusting clamp for coating pole piece |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3314163A (en) * | 1964-02-21 | 1967-04-18 | Kohler Coating Machinery Corp | Nozzle construction for coating machines and the like |
| US3687103A (en) * | 1971-01-28 | 1972-08-29 | Youngstown Sheet And Tube Co | Controlled-width fluid doctor |
| IT1005507B (en) * | 1972-11-27 | 1976-09-30 | Italsider Spa | PERFECTED DEVICE FOR CONTINUOUS REGULATION OF THE ZINC COATING OF A STEEL SHEET OR SIMILAR |
| US3941086A (en) * | 1973-08-08 | 1976-03-02 | Italsider S.P.A. | Fluid doctor blade |
| US4392613A (en) * | 1980-12-22 | 1983-07-12 | Armco Inc. | Discharge gap cleaning device |
| GB2096490B (en) * | 1981-04-13 | 1984-12-05 | Davey Loewy Ltd | Spraying apparatus |
| ES2009820T5 (en) * | 1986-06-12 | 1995-08-16 | Duma Konstruktionsburo | EVACUATION DEVICE FOR CONTINUOUS BILATERAL COVERAGE OF A METAL BELT. |
-
1987
- 1987-02-11 DE DE19873704199 patent/DE3704199A1/en active Granted
-
1988
- 1988-02-03 DE DE8888101512T patent/DE3873108D1/en not_active Expired - Lifetime
- 1988-02-03 AT AT88101512T patent/ATE78878T1/en active
- 1988-02-03 ES ES198888101512T patent/ES2033945T3/en not_active Expired - Lifetime
- 1988-02-03 EP EP88101512A patent/EP0278373B1/en not_active Expired - Lifetime
-
1992
- 1992-09-14 GR GR920402026T patent/GR3005694T3/el unknown
Also Published As
| Publication number | Publication date |
|---|---|
| ATE78878T1 (en) | 1992-08-15 |
| EP0278373A3 (en) | 1989-03-15 |
| EP0278373A2 (en) | 1988-08-17 |
| GR3005694T3 (en) | 1993-06-07 |
| ES2033945T3 (en) | 1993-04-01 |
| DE3704199C2 (en) | 1990-09-27 |
| DE3873108D1 (en) | 1992-09-03 |
| DE3704199A1 (en) | 1988-08-25 |
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