EP0427015B1 - Device for suspended transport web or sheet materials - Google Patents
Device for suspended transport web or sheet materials Download PDFInfo
- Publication number
- EP0427015B1 EP0427015B1 EP90119819A EP90119819A EP0427015B1 EP 0427015 B1 EP0427015 B1 EP 0427015B1 EP 90119819 A EP90119819 A EP 90119819A EP 90119819 A EP90119819 A EP 90119819A EP 0427015 B1 EP0427015 B1 EP 0427015B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nozzle
- nozzles
- nozzle body
- blowing
- 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 - Lifetime
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H23/00—Registering, tensioning, smoothing or guiding webs
- B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
- B65H23/24—Registering, tensioning, smoothing or guiding webs longitudinally by fluid action, e.g. to retard the running web
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2402/00—Constructional details of the handling apparatus
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2406/00—Means using fluid
- B65H2406/10—Means using fluid made only for exhausting gaseous medium
- B65H2406/11—Means using fluid made only for exhausting gaseous medium producing fluidised bed
- B65H2406/111—Means using fluid made only for exhausting gaseous medium producing fluidised bed for handling material along a curved path, e.g. fluidised turning bar
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2406/00—Means using fluid
- B65H2406/10—Means using fluid made only for exhausting gaseous medium
- B65H2406/11—Means using fluid made only for exhausting gaseous medium producing fluidised bed
- B65H2406/112—Means using fluid made only for exhausting gaseous medium producing fluidised bed for handling material along preferably rectilinear path, e.g. nozzle bed for web
Definitions
- the invention relates to a device for the suspended guiding of material webs or sheets of material to be conveyed, with nozzles fed by blown air in a nozzle body, each of which has a sunk surface in the nozzle body and inclined to the outside of the nozzle body, for the blowing air jet emerging from the nozzle opening.
- the nozzles can be designed so that they not only guide the material web or the sheet of material without contact, but also exert a tensile force that can be used for conveying the material web or the sheet of material or for spreading.
- a tensile force that can be used for conveying the material web or the sheet of material or for spreading.
- Such requirements cannot be met with simple nozzle openings in a nozzle body, because they do not define any of them Outflow of the blowing air can be achieved.
- nozzles have been developed which, due to their geometric design, guarantee a defined outflow of the blown air (DE-C-19 07 083). These nozzles are formed by an arcuate incision in the nozzle body, the area lying within the arc being lowered in a trough-like manner.
- U.S. Patent 4,500,229 discloses an apparatus for conveying cylindrical objects. Blast air jets emerge through nozzles arranged in a table surface in a nozzle body and blow on the cylindrical objects to be conveyed and then separated, the nozzle bodies being countersunk in the nozzle body (1) and inclined to the outside (2) of the nozzle body (1) arranged guide surface (3a) for the blown air jet emerging from the nozzle opening (4) and the guide surface (3a) is part of the lateral surface (3b) of a conical recess (3) in the nozzle body (1) and the nozzle opening (4) eccentrically in the recess (3) is arranged.
- the cylindrical objects are in contact with the table surface with one of their end faces.
- the object of the invention is to create, based on DE-C-19 07 083, a device for the suspended guiding of material webs and sheets to be conveyed, which has a higher contact security than the known device.
- the device according to the invention lacks the tongue-shaped nozzle lips required in the prior art for the shaping and alignment of the blowing air jet direction, which led to frictional contact with the material web.
- the eccentric arrangement of the nozzle opening in a conical depression with a correspondingly directed blowing air jet direction alone means that the blowing air emerges from the nozzle as a source flow in a defined sector.
- the choice of the blowing angle makes it possible to determine whether the focus of the device should be more on conveying or more on suction. The larger the blowing angle, the larger the sector of the source flow, so that the suction forces increase and the delivery forces decrease. The maximum conveying effect is achieved if the blowing air jet direction runs parallel to the guide surface.
- each nozzle has a plurality of nozzle openings, each with a tangential component of the blowing air jet direction, the tangential components of the blowing air jet directions of all nozzle openings being in the same direction.
- a spiral-shaped source flow is generated on the entire circumference of the conical depression.
- the nozzle body is made of sheet metal and the nozzles are molded into the sheet.
- the nozzle body is solid and the nozzles are formed in the nozzle body by machining.
- each nozzle is formed by a shaped body which is used in the nozzle body, which is composed in particular of sheet metal. This alternative is particularly suitable for large quantities.
- the nozzle body can be designed as a blow strip with nozzles arranged in a row transversely to the guide direction. If the aim is to achieve a spreading effect at the same time, the blowing jet direction of the nozzles in the central section of the bar is essentially perpendicular to the longitudinal axis of the nozzle body and passes from this section in a graduated manner in a direction parallel to the ends. If a conveying effect is to be exerted on the material sheets, then the blowing jets of all nozzles are directed essentially in the conveying direction.
- the intensity of the guidance or conveyance can be influenced by a more or less dense fitting of the nozzle body with nozzles.
- the nozzle bodies can also be designed according to the air cushion principle.
- An application according to the invention consists, for example, in that the nozzle body, as an arcuate deflecting body, has at least one row of nozzles arranged on each of its two edges running transversely to the conveying direction. If several rows are arranged on each edge, the nozzles of the two rows should be offset from one another.
- the nozzle body can also be used in the case of a sheet deposit with a conveyor track arranged above a sheet stack, in particular with a slide bar arranged downstream of a cross cutter, for the overlap of the sheets to be deposited one after the other.
- a nozzle body is used, in which each nozzle has blow-out openings arranged symmetrically around the center.
- the nozzle is formed by a shaped body F which is inserted in a recess in the nozzle body 1 made of sheet metal.
- the Blas povertystrahlraum S is not parallel to the guide surface 3a, but includes therewith a blowing angle ⁇ of less than 60 o.
- the exemplary embodiment of FIGS. 2, 2a also differs from that of FIGS. 1, 1a in that the upper region of the conical recess 3 has a larger opening angle than the lower region.
- FIGS. 3, 3a corresponds to that of FIGS. 1, 1a with the difference that not one nozzle opening but three nozzle openings 4a, 4b, 4c are provided and the blowing air jet directions S a , S b , S c additionally have a tangential component, where the tangential components are in the same direction.
- nozzle bodies corresponding to FIGS. 1 to 2a are designed as parallel strips.
- Each bar 11, 12, 13 carries a row of nozzles, the resulting jet direction of which is aligned with the source flow.
- nozzles according to one of the exemplary embodiments 1 to 2a are used.
- the resulting blowing directions are not directed in the same direction, but are arranged in the area of the center of the strip substantially perpendicular to the axis of the strip and then gradually move towards the ends in a direction parallel to the axial direction of the strip.
- a spreading effect is exerted on the material web.
- the gradation of the direction down to parallel to the axial direction and to the ends is chosen because otherwise the additive lateral forces exerted by the individual nozzles in the middle would be too great.
- the nozzle body extends perpendicular to the conveying direction and has two rows of nozzles on each of its two edges extending transversely to the conveying direction, whereby the nozzles of adjacent rows are offset by half a pitch.
- 6 shows no nozzle designs according to the invention; however, the nozzle designs according to the invention can be used without Insert another in the nozzle body. Between the edges, the nozzle body has an arcuate deflecting body B. The blowing air jet direction of the nozzles is at the two edges directed towards each other so that an air cushion carrying the material web M builds up between the edges in connection with the material web M to be guided.
- the nozzles on one edge and the nozzles on the other edge are transverse to the conveying direction and open to the material web M channels N 1, N 2, which have the task of contributing to the Bernoulli effect of air flowing out between the nozzles to counteract the small material web distance.
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- Advancing Webs (AREA)
Description
Die Erfindung bezieht sich auf eine Vorrichtung zum schwebenden Führen von zu fördernden Materialbahnen oder Materialbogen mit blasluftgespeisten Düsen in einem Düsenkörper, die jeweils eine versenkt im Düsenkörper und geneigt zur Außenseite des Düsenkörpers angeordnete Leitfläche für den aus der Düsenöffnung austretenden Blasluftstrahl haben.The invention relates to a device for the suspended guiding of material webs or sheets of material to be conveyed, with nozzles fed by blown air in a nozzle body, each of which has a sunk surface in the nozzle body and inclined to the outside of the nozzle body, for the blowing air jet emerging from the nozzle opening.
Beim Führen und Fördern von Materialbahnen oder Materialbogen gibt eine Reihe von Aufgaben, die unabhängig voneinander oder kombiniert zu erfüllen sind. Im Vordergrund steht dabei das schwebende Führen, d.h. die Materialbahn oder der Materialbogen sollen ohne körperlichen Kontakt über die auf sie einwirkenden Elemente geführt werden. Nicht nur über gradlinige Förderstrecken, sondern auch über gebogene Förderstrecken gilt es die Materialbahn oder den Materialbogen zu führen. Diese Forderungen lassen sich ausschließlich mit blasluftgespeisten Düsen in einem Düsenkörper erfüllen.When guiding and conveying material webs or material sheets, there are a number of tasks that must be performed independently or in combination. The focus is on floating leadership, i.e. the material web or the material sheet should be guided over the elements acting on it without physical contact. The material web or the sheet of material must be guided not only over straight conveyor lines, but also over curved conveyor lines. These requirements can only be met with air nozzles in a nozzle body.
Dabei können die Düsen so gestaltet sein, daß sie nicht nur die Materialbahn oder den Materialbogen berührungsfrei führen, sondern auch eine Zugkraft ausüben, die für die Förderung der Materialbahn oder des Materialbogens oder aber zum Breitstrecken ausgenutzt werden kann. Mit einfachen Düsenöffnungen in einem Düsenkörper lassen sich solche Forderungen jedoch nicht erfüllen, weil mit ihnen keine definierte Abströmung der Blasluft erreicht werden kann. Deshalb sind Düsen entwickelt worden, die aufgrund ihrer geometrischen Gestaltung eine definierte Abströmung der Blasluft garantieren (DE-C-19 07 083). Diese Düsen sind durch einen bogenförmigen Einschnitt im Düsenkörper gebildet, wobei der innerhalb des Bogens liegende Bereich muldenförmig abgesenkt ist. Bei Beaufschlagung mit Blasluft tritt aus der so gebildeten schlitzförmigen Düsenöffnung eine Quellströmung aus, die zu einem Unterdruck an der in der Ebene der Oberfläche des Düsenkörpers liegenden zungenförmige Düsenlippe mit der Gefahr führt, daß die Materialbahn diese Düsenlippe berührt. Daraus resultieren Verschleiß der Düsen und Abrieb an der Materialbahnoberfläche. Dies wiederum stellt bei verschiedenen Anwendungen mit höchstem Reinheitsgebot den Einsatz solcher Düsenkörper in Frage. Hinzu kommt, daß die scharfkantigen Düsenlippen die Materialbahn hinsichtlich eines Abrisses gefährden.The nozzles can be designed so that they not only guide the material web or the sheet of material without contact, but also exert a tensile force that can be used for conveying the material web or the sheet of material or for spreading. However, such requirements cannot be met with simple nozzle openings in a nozzle body, because they do not define any of them Outflow of the blowing air can be achieved. For this reason, nozzles have been developed which, due to their geometric design, guarantee a defined outflow of the blown air (DE-C-19 07 083). These nozzles are formed by an arcuate incision in the nozzle body, the area lying within the arc being lowered in a trough-like manner. When blown air is applied, a source flow emerges from the slot-shaped nozzle opening thus formed, which leads to a negative pressure on the tongue-shaped nozzle lip lying in the plane of the surface of the nozzle body, with the risk that the material web touches this nozzle lip. This results in nozzle wear and abrasion on the material web surface. This in turn questions the use of such nozzle bodies in various applications with the highest purity requirement. In addition, the sharp-edged nozzle lips endanger the material web with regard to tearing.
US-PS 4,500,229 offenbart eine Vorrichtung zur Förderung zylindrischer Gegenstände. Durch in einer Tischoberfläche angeordnete Düsen in einem Düsenkörper treten Blasluftstrahlen aus, die die zu fördernden und anschließend zu vereinzelnden zylindrischen Gegenstände von unten anblasen, wobei die Düsenkörper jeweils eine versenkt im Düsenkörper (1) und geneigt zur Außenseite (2) des Düsenkörpers (1) angeordnete Leitfläche (3a) für den aus der Düsenöffnung (4) austretenden Blasluftstrahl haben und die Leitfläche (3a) Teil der Mantelfläche (3b) einer kegeligen Vertiefung (3) in dem Düsenkörper (1) ist und wobei die Düsenöffnung (4) exzentrisch in der Vertiefung (3) angeordnet ist. Die zylindrischen Gegenstände sind mit einer ihrer Stirnseiten in Kontakt mit der Tischoberfläche.U.S. Patent 4,500,229 discloses an apparatus for conveying cylindrical objects. Blast air jets emerge through nozzles arranged in a table surface in a nozzle body and blow on the cylindrical objects to be conveyed and then separated, the nozzle bodies being countersunk in the nozzle body (1) and inclined to the outside (2) of the nozzle body (1) arranged guide surface (3a) for the blown air jet emerging from the nozzle opening (4) and the guide surface (3a) is part of the lateral surface (3b) of a conical recess (3) in the nozzle body (1) and the nozzle opening (4) eccentrically in the recess (3) is arranged. The cylindrical objects are in contact with the table surface with one of their end faces.
Aufgabe der Erfindung ist es, ausgehend von der DE-C-19 07 083 eine Vorrichtung zum schwebenden Führen von zu fördernden Materialbahnen und Bogen zu schaffen, die eine höhere Berührungssicherheit als die bekannte Vorrichtung hat.The object of the invention is to create, based on DE-C-19 07 083, a device for the suspended guiding of material webs and sheets to be conveyed, which has a higher contact security than the known device.
Bei der erfindungsgemäßen Vorrichtung fehlen die beim Stand der Technik für die Formgebung und Ausrichtung der Blasluftstrahlrichtung notwendigen zungenförmigen Düsenlippen, die zu einem Reibungskontakt mit der Materialbahn führten. Allein durch die exzentrische Anordnung der Düsenöffnung in einer kegeligen Vertiefung mit entsprechend gerichteter Blasluftstrahlrichtung läßt sich erreichen, daß die Blasluft als Quellströmung in einem definierten Sektor aus der Düse austritt. Über die Wahl des Anblaswinkels läßt sich bestimmen, ob bei der Vorrichtung der Schwerpunkt mehr bei der Förderung oder mehr beim Ansaugen liegen soll. Je größer der Anblaswinkel ist, desto größer ist der Sektor der Quellströmung, so daß die Ansaugkräfte steigen und die Förderkräfte sinken. Die maximale Förderwirkung wird erreicht, wenn die Blasluftstrahlrichtung parallel zur Leitfläche verläuft.The device according to the invention lacks the tongue-shaped nozzle lips required in the prior art for the shaping and alignment of the blowing air jet direction, which led to frictional contact with the material web. The eccentric arrangement of the nozzle opening in a conical depression with a correspondingly directed blowing air jet direction alone means that the blowing air emerges from the nozzle as a source flow in a defined sector. The choice of the blowing angle makes it possible to determine whether the focus of the device should be more on conveying or more on suction. The larger the blowing angle, the larger the sector of the source flow, so that the suction forces increase and the delivery forces decrease. The maximum conveying effect is achieved if the blowing air jet direction runs parallel to the guide surface.
Wenn keine Förderwirkung notwendig ist, läßt sich die Qualität des berührungslosen Führens weiter dadurch verbessern, daß jede Düse mehrere Düsenöffnungen mit jeweils einer tangentialen Komponente der Blasluftstrahlrichtung hat, wobei die tangentialen Komponenten der Blasluftstrahlrichtungen aller Düsenöffnungen gleichsinnig sind. In diesem Fall wird eine spiralförmig verlaufende Quellströmung auf dem gesamten Umfang der kegeligen Vertiefung erzeugt.If no conveying action is necessary, the quality of the contactless guiding can be further improved in that each nozzle has a plurality of nozzle openings, each with a tangential component of the blowing air jet direction, the tangential components of the blowing air jet directions of all nozzle openings being in the same direction. In this case, a spiral-shaped source flow is generated on the entire circumference of the conical depression.
Für die konstruktive Ausführung der Düsen gibt es mehrere Möglichkeiten:
Nach einer ersten Alternative besteht der Düsenkörper aus Blech und die Düsen sind im Blech eingeformt. Nach einer zweiten Alternative ist der Düsenkörper massiv und die Düsen sind durch spanabhebende Formgebung im Düsenkörper gebildet. Nach einer dritten Alternative ist jede Düse von einem Formkörper gebildet, der im insbesondere aus Blech bestehende Düsenkörper eingesetzt ist. Diese Alternative ist besonders geeignet für hohe Stückzahlen.There are several options for the design of the nozzles:
According to a first alternative, the nozzle body is made of sheet metal and the nozzles are molded into the sheet. According to a second alternative, the nozzle body is solid and the nozzles are formed in the nozzle body by machining. According to a third alternative, each nozzle is formed by a shaped body which is used in the nozzle body, which is composed in particular of sheet metal. This alternative is particularly suitable for large quantities.
Die erfindungsgemäße Vorrichtung läßt sich je nach Aufgabengebiet verschieden gestalten. Wenn es darum geht, die Materialbahnen oder Materialbogen nur zu führen, kann der Düsenkörper als Blasleiste mit in einer Reihe quer zur Führungsrichtung angeordneten Düsen ausgebildet sein. Wenn es darum geht, gleichzeitig eine Breitstreckwirkung zu erzielen, dann verläuft die Blasstrahlrichtung der Düsen im mittleren Abschnitt der Leiste im wesentlichen senkrecht zur Längsachse des Düsenkörpers und geht von diesem Abschnitt abgestuft in eine parallele Richtung zu den Enden hin über. Soll eine Förderwirkung auf die Materialbogen ausgeübt werden, dann sind die Blasstrahlen aller Düsen im wesentlichen in Förderrichtung gerichtet. Über eine mehr oder weniger dichte Bestückung des Düsenkörpers mit Düsen kann die Intensität der Führung beziehungsweise Förderung beeinflußt werden.The device according to the invention can be designed differently depending on the task. If it is only a question of guiding the material webs or sheets of material, the nozzle body can be designed as a blow strip with nozzles arranged in a row transversely to the guide direction. If the aim is to achieve a spreading effect at the same time, the blowing jet direction of the nozzles in the central section of the bar is essentially perpendicular to the longitudinal axis of the nozzle body and passes from this section in a graduated manner in a direction parallel to the ends. If a conveying effect is to be exerted on the material sheets, then the blowing jets of all nozzles are directed essentially in the conveying direction. The intensity of the guidance or conveyance can be influenced by a more or less dense fitting of the nozzle body with nozzles.
Auch lassen sich die Düsenkörper nach dem Luftkissenprinzip gestalten. Eine erfindungsgemäße Anwendung besteht zum Beispiel darin, daß der Düsenkörper als bogenförmiger Umlenkkörper mit nach dem Luftkissenprinzip mindestens einer an jedem seiner beiden quer zur Förderrichtung verlaufenden Rändern angeordnete Reihe von Düsen aufweist. Sofern an jedem Rand mehrere Reihen angeordnet sind, sollten die Düsen der beiden Reihen gegeneinander versetzt sein.The nozzle bodies can also be designed according to the air cushion principle. An application according to the invention consists, for example, in that the nozzle body, as an arcuate deflecting body, has at least one row of nozzles arranged on each of its two edges running transversely to the conveying direction. If several rows are arranged on each edge, the nozzles of the two rows should be offset from one another.
Der Düsenkörper läßt sich auch bei einer Bogenablage mit oberhalb eines Bogenstapels angeordneten, einer Förderstrecke, insbesondere mit einem Querschneider nachgeordneten Schwebeleisten für die Überlappung der nacheinander abzulegenden Bogen einsetzen. Dabei kommt vor allem ein Düsenkörper zur Anwendung, bei dem jede Düse symmetrisch um die Mitte herum angeordnete Ausblasöffnungen ausweist.The nozzle body can also be used in the case of a sheet deposit with a conveyor track arranged above a sheet stack, in particular with a slide bar arranged downstream of a cross cutter, for the overlap of the sheets to be deposited one after the other. In particular, a nozzle body is used, in which each nozzle has blow-out openings arranged symmetrically around the center.
Im folgenden wird die Erfindung anhand einer Ausführungsbeispiele schematisch darstellenden Zeichnung näher erläutert. Im einzelnen zeigen:
- Fig. 1
- einen Ausschnitt aus einem Düsenkörper aus Blech mit eingesetzter Düse im Querschnitt,
- Fig. 1a
- den Düsenkörper gemäß Fig. 1 in Draufsicht,
- Fig. 2
- einen Ausschnitt aus einem gegenüber dem Düsenkörper gemäß Fig. 1 geringfügig abgewandelten Düsenkörper im Querschnitt,
- Fig. 2a
- den Düsenkörper gemäß Fig. 2 in Draufsicht,
- Fig. 3
- einen Ausschnitt aus einem Düsenkörper mit einer eingesetzten Düse in einer zu Fig. 1 und 2 abgewandelten Ausführung im Querschnitt,
- Fig. 3a
- den Düsenkörper gemäß Fig. 3 in Draufsicht,
- Fig. 4
- mehrere einen Führungs- und Fördertisch bildende als Leisten ausgebildete Düsenkörper in Draufsicht,
- Fig. 5
- einen als Leiste ausgebildeter Düsenkörper mit Breitstreckwirkung in Draufsicht,
- Fig. 6
- einen als bogenförmigen Umlenkkörper ausgestalteten Düsenkörper im Querschnitt und
- Fig. 7
- den Düsenkörper gemäß Fig. 6 in Draufsicht ausschnittweise.
- Fig. 1
- a section of a nozzle body made of sheet metal with an inserted nozzle in cross section,
- Fig. 1a
- 1 in top view,
- Fig. 2
- 2 shows a cross section of a nozzle body which is slightly modified compared to the nozzle body according to FIG. 1,
- Fig. 2a
- 2 in top view,
- Fig. 3
- 3 shows a section of a nozzle body with an inserted nozzle in a cross-sectional design modified from FIGS. 1 and 2,
- Fig. 3a
- 3 in top view,
- Fig. 4
- several nozzle bodies, formed as strips, forming a guide and conveyor table, in plan view,
- Fig. 5
- a nozzle body designed as a strip with a spreading effect in plan view,
- Fig. 6
- a cross section of a nozzle body configured as an arcuate deflecting body and
- Fig. 7
- the nozzle body according to FIG. 6 in plan view in sections.
In der folgenden Beschreibung sind einander entsprechende Elemente der verschiedenden Ausführungsbeispiele mit den gleichen Bezugszeichen versehen.In the following description, elements that correspond to one another in the various exemplary embodiments are provided with the same reference symbols.
In den Ausführungsbeispielen gemäß den Fig. 1, 1a, 2, 2a ist die Düse von einem Formkörper F gebildet, der in einer Ausnehmung des aus Blech bestehenden Düsenkörpers 1 eingesetzt ist. Die Blasluftstrahlrichtung S verläuft nicht parallel zur Leitfläche 3a, sondern schließt mit dieser einen Anblaswinkel β kleiner als 60 o. Das Ausführungsbeispiel der Figuren 2, 2a weicht darüber hinaus von dem der Figuren 1, 1a ab, indem der obere Bereich der kegeligen Vertiefung 3 einen größeren Öffnungswinkel als der untere Bereich hat.In the exemplary embodiments according to FIGS. 1, 1a, 2, 2a, the nozzle is formed by a shaped body F which is inserted in a recess in the
Das Ausführungsbeispiel der Figuren 3, 3a entspricht dem der Figuren 1, 1a mit dem Unterschied, daß nicht eine Düsenöffnung, sondern drei Düsenöffnungen 4a, 4b, 4c vorgesehen sind und die Blasluftstrahlrichtungen Sa, Sb, Sc zusätzlich eine tangentiale Komponente haben, wobei die tangentialen Komponenten gleichsinnig sind. Bei diesem Ausführungsbeispiel ergibt sich über den gesamten Rand 5 eine spiralförmige Quellströmung.The exemplary embodiment of FIGS. 3, 3a corresponds to that of FIGS. 1, 1a with the difference that not one nozzle opening but three
Bei Ausführungsbeispiel der Figur 4 sind Düsenkörper entsprechend den Figuren 1 bis 2a als parallele Leisten ausgebildet. Jede Leiste 11, 12, 13 trägt eine Reihe von Düsen, deren resultierende Strahlrichtung der Quellströmung gleichgerichtet ist. Für die Führung und Förderung von Papierbahnen oder Papierbogen mit einem Gewicht von 50 - 300 g/m₂ genügt eine Ausführung der Düsen gemäß Fig. 1 oder 2 mit folgender Bemessung: α = 90o, K = 25 mm, d = 4 mm, t = 50 mm, b = 70 mm, C = 30 mm, wenn die Düsen mit einem Blasluftdruck von 1/100 bar betrieben werden.In the exemplary embodiment in FIG. 4, nozzle bodies corresponding to FIGS. 1 to 2a are designed as parallel strips. Each bar 11, 12, 13 carries a row of nozzles, the resulting jet direction of which is aligned with the source flow. For guiding and conveying paper webs or sheets of paper weighing 50 - 300 g / m₂ is sufficient to design the nozzles according to FIG. 1 or 2 with the following dimensions: α = 90 o , K = 25 mm, d = 4 mm, t = 50 mm, b = 70 mm, C = 30 mm , if the nozzles are operated with a blowing air pressure of 1/100 bar.
Bei Überkopf, d.h. als Schwebedecke arbeitenden Leisten, unter denen die Materialbahn hängend geführt und gefördert wird, empfiehlt sich eine Ausführung nach Fig. 3. Ist das Material stark luftdurchlässig, empfiehlt sich eine Ausführung nach Fig. 2 mit einem auf 1/50 bar erhöhten Luftdruck.With overhead, i.e. As a floating ceiling, under which the material web is suspended and conveyed, an embodiment according to Fig. 3 is recommended. If the material is highly permeable to air, an embodiment according to Fig. 2 with an air pressure increased to 1/50 bar is recommended.
Bei dem in Fig. 5 dargestellten, als Leiste ausgebildeten Düsenkörper sind Düsen nach eine der Ausführungsbeispiele 1 bis 2a eingesetzt. Im Unterschied zu den Leisten der Fig. 4 sind die resultierenden Blasstrahlrichtungen aber nicht gleich gerichtet, sondern sind im Bereich der Mitte der Leiste im wesentlichen senkrecht zur Leistenachse angeordnet und gehen dann stufenweise in eine Richtung parallel zu der Achsrichtung der Leiste zu den Enden hinüber. Mit einem solchen Düsenkörper wird ein Breitstreckeffekt auf die Materialbahn ausgeübt. Die Abstufung der Richtung bis auf parallel zur Achsrichtung und zu den Enden hin gerichtet wird gewählt, weil anders die sich addierenden, von den einzelnen Düsen ausgeübten Seitenkräfte in der Mitte zu groß wären.5, designed as a bar, nozzles according to one of the
Beim Ausführungsbeispiel der Figur 6, das der berührungslosen Umlenkung einer zur führenden Materialbahn aus einer ersten Ebene in eine zweite Ebene dient, erstreckt sich der Düsenkörper senkrecht zur Förderrichtung und weist an seinen beiden quer zur Förderrichtung sich erstreckenden Rändern jeweils zwei Reihen von Düsen auf, wobei die Düsen benachbarter Reihen gegeneinander um eine halbe Teilung versetzt sind. In der Darstellung gemäß Fig. 6 sind keine erfindungsgemäßen Düsenausbildungen dargestellt; jedoch lassen sich die erfindungsgemäßen Düsenausbildungen ohne weiteres in den Düsenkörper einfügen. Zwischen den Rändern weist der Düsenkörper einen bogenförmigen Umlenkkörper B auf. Die Blasluftstrahlrichtung der Düsen an den beiden Rändern ist aufeinander zu gerichtet, so daß sich zwischen den Rändern in Verbindung mit der zu führenden Materialbahn M ein die Materialbahn M tragendes Luftpolster aufbaut. In Förderrichtung R der Materialbahn M sind den Düsen am einen Rand und den Düsen am anderen Rand quer zur Förderrichtung verlaufende, zur Materialbahn M offene Rinnen N₁, N₂ vorbeziehungsweise nachgeordnet, die die Aufgabe haben, dem Bernoulli-Effekt von zwischen den Düsen abströmender Luft bei kleinem Materialbahnabstand entgegenzuwirken.In the exemplary embodiment in FIG. 6, which serves for the contactless deflection of a material web leading from a first plane into a second plane, the nozzle body extends perpendicular to the conveying direction and has two rows of nozzles on each of its two edges extending transversely to the conveying direction, whereby the nozzles of adjacent rows are offset by half a pitch. 6 shows no nozzle designs according to the invention; however, the nozzle designs according to the invention can be used without Insert another in the nozzle body. Between the edges, the nozzle body has an arcuate deflecting body B. The blowing air jet direction of the nozzles is at the two edges directed towards each other so that an air cushion carrying the material web M builds up between the edges in connection with the material web M to be guided. In the conveying direction R of the material web M, the nozzles on one edge and the nozzles on the other edge are transverse to the conveying direction and open to the material web
Versuche mit einer solchen Vorrichtung zum Umlenken einer Materialbahn haben ergeben, daß die Materialbahn mit engem Abstand und mit im Vergleich zu herkömmlichen Umlenkungen mit weniger als der Hälfte an Blasluftenergie berührungssicher umgelenkt werden kann. Dabei wurde in der Materialbahn ein Zug von 25 kg auf 1 m Breite und ein Druck von 0,08 bar für die Speisung der Düsen angewandt. Der Krümmungsradius des bogenförmigen Unlenkkörpers B betrug 60 mm, während für die übrigen Maße der Düsen gewählt wurden α = 90o, K = 12 mm, t = 15 mm, d = 5 mm.Experiments with such a device for deflecting a material web have shown that the material web can be deflected in a contact-safe manner at a close distance and with less than half of the blowing air energy compared to conventional deflections. A tension of 25 kg over a width of 1 m and a pressure of 0.08 bar were used in the material web to feed the nozzles. The radius of curvature of the arcuate deflecting body B was 60 mm, while for the other dimensions of the nozzles, α = 90 ° , K = 12 mm, t = 15 mm, d = 5 mm.
Claims (8)
- Apparatus for the floating guidance of material webs or material sheets, to be conveyed, by means of blowing-air-fed nozzles in a nozzle body (1), which nozzles each have a guiding surface (3a) which is arranged such that it is sunken in the nozzle body (1) and is inclined with respect to the outer side (2) of the nozzle body (1) and which is intended for the blowing-air jet emerging from the nozzle opening (4), characterized in that the guiding surface (3a) is part of the outer surface (3b) of a conical depression (3) in the nozzle body (1), in that the nozzle opening (4) is arranged eccentrically in the depression (3), and in that the blowing-air jet is directed onto the guiding surface (3a), and its direction encloses, with said guiding surface (3a), a blow-on angle (β) which is smaller than 60°.
- Apparatus according to Claim 1, characterized in that each nozzle has a plurality of nozzle openings (4a, 4b, 4c) each with a tangential component of the blowing-air-jet direction (Sa, Sb, Sc), the tangential component of the blowing-air-jet direction (Sa, Sb, Sc) of all the nozzle openings (4a, 4b, 4c) being in the same direction.
- Apparatus according to Claim 1, characterized in that each nozzle is formed by a moulding (F) which is inserted in the nozzle body (2).
- Apparatus according to Claim 1, characterized in that the nozzle body (1) is defined as a strip having nozzles arranged in a row.
- Apparatus according to Claim 4, characterized in that the blowing-air-jet direction (5) of all the nozzles is directed in essentially the same direction.
- Apparatus according to Claim 4, characterized in that the blowing-air-jet direction of the nozzles in the central section of the strip runs perpendicularly with respect to the longitudinal axis of the nozzle body and, from said section, passes, in a stepped manner, into a direction which is parallel to the longitudinal axis of the nozzle body (1) and is directed towards the ends.
- Apparatus according to Claim 4, characterized in that the nozzle body is designed as an arcuate deflection body (B) having, in accordance with the air-cushion principle, at least one row of nozzles which is arranged on each of its two borders running transversely with respect to the conveying direction (R).
- Apparatus according to Claim 7, characterized in that a plurality of rows having nozzles which are offset with respect to one another are provided on each border.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3936846 | 1989-11-06 | ||
DE3936846A DE3936846C1 (en) | 1989-11-06 | 1989-11-06 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0427015A2 EP0427015A2 (en) | 1991-05-15 |
EP0427015A3 EP0427015A3 (en) | 1991-08-21 |
EP0427015B1 true EP0427015B1 (en) | 1995-05-17 |
Family
ID=6392930
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90119819A Expired - Lifetime EP0427015B1 (en) | 1989-11-06 | 1990-10-16 | Device for suspended transport web or sheet materials |
Country Status (3)
Country | Link |
---|---|
US (1) | US5102118A (en) |
EP (1) | EP0427015B1 (en) |
DE (2) | DE3936846C1 (en) |
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-
1989
- 1989-11-06 DE DE3936846A patent/DE3936846C1/de not_active Expired - Lifetime
-
1990
- 1990-10-16 EP EP90119819A patent/EP0427015B1/en not_active Expired - Lifetime
- 1990-10-16 DE DE59009090T patent/DE59009090D1/en not_active Expired - Fee Related
- 1990-11-01 US US07/608,161 patent/US5102118A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE3936846C1 (en) | 1991-04-18 |
DE59009090D1 (en) | 1995-06-22 |
EP0427015A3 (en) | 1991-08-21 |
EP0427015A2 (en) | 1991-05-15 |
US5102118A (en) | 1992-04-07 |
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