EP0482500B1 - Dispositif de guidage pour guider, devier et/ou retourner une bande de matériau - Google Patents

Dispositif de guidage pour guider, devier et/ou retourner une bande de matériau Download PDF

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Publication number
EP0482500B1
EP0482500B1 EP91117662A EP91117662A EP0482500B1 EP 0482500 B1 EP0482500 B1 EP 0482500B1 EP 91117662 A EP91117662 A EP 91117662A EP 91117662 A EP91117662 A EP 91117662A EP 0482500 B1 EP0482500 B1 EP 0482500B1
Authority
EP
European Patent Office
Prior art keywords
block
web
bores
medium
sections
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
Application number
EP91117662A
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German (de)
English (en)
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EP0482500A1 (fr
Inventor
Uwe Dipl.-Ing. Gartmann
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.)
Hoechst AG
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Hoechst AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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Application filed by Hoechst AG filed Critical Hoechst AG
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H47/00—Unfolding thin limp material
    • 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
    • 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
    • B65H23/02—Registering, tensioning, smoothing or guiding webs transversely
    • B65H23/032—Controlling transverse register of web
    • B65H23/035—Controlling transverse register of web by guide bars
    • 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
    • B65H23/32—Arrangements for turning or reversing webs
    • 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
    • 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
    • B65H2406/14—Means using fluid made only for exhausting gaseous medium with selectively operated air supply openings

Definitions

  • the invention relates to a guide device for guiding, deflecting and / or deflecting a material web, which is guided over a number of rolls, the guide device being connected to a medium supply device and extending over the entire width of the rolls and having bores through which a Medium flow flows against the material web in the given direction.
  • a belt turning device over which a belt, carried by an air cushion, is guided in several reversing loops in such a way that the belt top becomes the belt underside.
  • Rows of openings are provided in the surface of the tape turning device, the rows being aligned in the tape running direction and each row having a nozzle which is connected to a line.
  • There is a control valve in each line and each line is connected to a pressure tank so that the pressure in each line and thus in a series of openings can be controlled separately.
  • the width of the air-bearing cushion for the band can be adjusted to the respective band width by either applying air to all the rows of the openings or only some of the rows.
  • the two outer rows can be subjected to greater pressure than the inner rows in order to compensate for the greater pressure drop at the edges of the tape and thus the tape to circulate as plan as possible. It is not possible to regulate the pressure transversely to the belt running direction.
  • US-A-3 521 802 relates to a guide device which is composed of a stack of laminar elements which are held between two end plates.
  • the single laminar element comprises two side surfaces, one of which contains an arrangement of radial grooves, while the other side surface is flat. Material webs of different widths are guided over the guide device.
  • Each of the laminar elements has a curved groove which is connected to one of four symmetrically arranged passages.
  • the curved groove runs coaxially with the cylindrical part of the upper edge of the outline of the laminar element.
  • the passages of the laminar elements are aligned in the stack, so that they form four channels over the length of the stack, which can be acted upon with different pressure via lines from a pressure source.
  • the radial grooves start from the curved grooves and communicate in groups with the channels.
  • air is blown out through the radial grooves over different sections of the stack in such a way that the air cushion can be adapted to the width of the material web.
  • Such an air guiding device for guiding an endless web of material for example a paper web, which runs in a meandering shape over a plurality of cylinders or alternately over cylinders and guide rollers, is known from DE-OS 39 04 314.
  • This air guiding device is connected to a blown air supply and extends across the entire width of the cylinders and guide rolls, air being blown against the material web in each case in a predetermined direction via blown openings.
  • the blowing direction of the air is reversible, this is done in such a way that two successive, mutually separated pressure chambers, one of which acts as a suction chamber and the following as a blowing chamber in normal operation, can be switched so that the inlet-side pressure chamber as a blowing chamber and the subsequent pressure chamber as Suction chamber take effect.
  • the air guiding device can also be divided into a number of separate air chambers transversely to the running direction of the web be, wherein an edge chamber is provided for transferring a transfer strip when starting or after a goods tear.
  • the air chambers are each individually adjustable according to the specified or the inverted blowing direction.
  • the air volumes can also be adjusted depending on the blowing direction.
  • the known air guiding device reliably guides the endless web of material on its way to and between the cylinders and / or the guide rollers, and maximizes the conditioning of the web, for example its drying.
  • the paper web runs from cylinder to cylinder.
  • the air guiding device counteracts the forces acting on the web by means of adhesion, friction, negative and dynamic pressure, dead weight and centrifugal forces. It must be taken into account that an optimal drying effect should also be achieved with such air guiding devices, which is best when air is blown out against the direction of travel of the paper web, since this creates turbulence on the surface of the paper web which accelerates drying.
  • transfer strip When starting up a paper machine or after tearing off the paper web when threading the so-called transfer strip, however, such a blowing direction against the running direction of the paper web is unfavorable, since the relatively narrow transfer strip is blown away by the blowing jet due to its relatively low weight.
  • the known Air guiding device enables the blowing air direction and the conditions to be individually adapted to the respective operating state and the respective type of goods, in that the blowing direction can be inverted and, furthermore, the paper web, viewed in the running direction, can be blown differently in sections in different directions.
  • a vacuum nozzle system for contactless carrying and handling of webs, for example for drying, heating and cooling, is known.
  • This vacuum system consists of a nozzle box, which has a surface lying against the web, on which there are two nozzle gaps, the nozzle system being asymmetrical with respect to the vertical central plane of the vacuum support surface.
  • the nozzle box has a substantially flat wing, on one edge of which an arc-shaped Coanda air guide surface is attached, on which the first nozzle of the nozzle system is located.
  • Their blowing direction initially runs essentially perpendicular to the plane of the web to be carried.
  • the Coanda air guiding surface is arranged in such a way that it deflects the air flow emerging from the first nozzle in the direction of the plane of the airfoil and the web running over it.
  • a guide vane In the edge area opposite to the first nozzle there is a guide vane, which continues the flat wing continuously.
  • a second blowing nozzle In the area or on the outer edge of the guide surface, a second blowing nozzle is arranged, the direction of which runs parallel to the guide surface of the wing.
  • a device for web edge monitoring of a guided web is described in DE-OS 39 03 783.
  • This is a device for conveying a flat object, in particular an endless web of material, which comprises conveying means for moving the object in a predetermined direction and a monitoring device for monitoring the position of the object.
  • the monitoring device contains a blowing nozzle directed at the edge region of the surface of the object, which blows out a gaseous jet.
  • the pressure measuring device is connected to an evaluation and control arrangement for processing the measurement signals into position signals which represent the position of the edge of the object.
  • Such a device enables an exact processing and processing of objects, whereby a material web, in particular made of paper, or another flat object is conveyed along a predetermined path and lateral deviations are prevented. This is done by continuously monitoring the position of an edge of the material web or the flat object, and corrective measures are initiated if deviations from a predetermined position of the edge occur. This side edge control thus prevents the object from migrating sideways.
  • the object of the invention is to improve a guide device of the type described at the outset so that when the material web is deflected and / or deflected, the curvature of the material web changing as a function of the web width, the side edges of the material web are guided without lateral deviation .
  • the guide device comprises a block with a curved surface over which the material web is guided at a distance, that holes in the surface of the block transverse to the direction of the material web are present in each section of a number of sections that in each section bores are connected to each other and with a line to the medium supply device and that the sections (5A, ... 5F) can be acted upon with medium flows of different speeds or with different amounts of medium.
  • the block is cylindrical, the bores are accommodated in sections, and a predetermined number of bores in the sections are connected to one another.
  • the bores are arranged as throttle bores in a surface facing the material web and this surface is at a predetermined distance from the rear sides of the sections of the block.
  • the different actuation of the individual sections of the segmented block which is a kind of support nozzle, creates lateral force components in addition to the longitudinal edges of the material web, which are used to guide the side edges.
  • the invention can be used both for material webs carried in air and for material webs which are transported in baths filled with liquids. In the former case, it can involve the transport of thin foils or metal strips in drying devices, while in the second case the strip guidance of aluminum strips in electroplating baths can be considered.
  • a material web 2 for example an aluminum band, paper web, film web or the like, which is guided over rollers 19 and a guide device 1, is shown schematically in FIG.
  • the guide device 1 comprises, as an essential component, a segmented, that is to say divided into sections, support nozzle in the form of a block with a curved surface, in which bores are arranged within the individual sections.
  • the carrying nozzle is supplied with a supply device Compressed air acts and ensures problem-free deflection, deflection and precise side edge guidance of the material web 2.
  • Deflection means deviating from the original plane of movement. Deflection is understood to mean a deviation from the original direction of movement in the same plane of movement.
  • FIG. 2 shows a schematic overview of the transport of a material web 2 through a liquid bath, for example the passage of an aluminum strip through an electroplating bath.
  • the material web 2 is introduced into the liquid bath via deflection rollers 20, 21, a guiding device 1 and a further deflection roller 22, transported through it and out of it.
  • the bath liquid of the liquid bath is expediently used as the operating medium for the guide device 1.
  • the guide device 1 facilitates the deflection of the material web 2, since this is lifted from the surface by the medium flowing out of the holes in the surface of the support nozzle of the guide device 1, so that neither adhesive nor frictional forces have to be overcome during the directional change.
  • a further guide device 1 can be provided.
  • a first embodiment of a guide device 1 is shown schematically in section.
  • the guide device 1 comprises, inter alia, a support nozzle in the form of a block 3 with a curved surface, which has a circular cross section, as can be seen from Figure 4.
  • a material web 2 is guided over the supporting nozzle at a short distance from the curved surface.
  • Bores 4A to 4F, which are accommodated in sections 5A, 5B,... 5F of block 3 run transversely to the material web in block 3.
  • the individual sections there is in each case a predetermined number of bores which are connected to one another and are connected to a medium supply device 8 via a common line 7A, 7B,... 7F.
  • the bores 4A to 4F are designed as throttle bores and are arranged in a surface 6 facing the material web 2. This area 6 is at a certain distance from the rear sides 18 of the sections 5A,... 5F of the block 3.
  • each of the sections 5A,... 5F is via a line 7A,... 7F, which are passed through the block 3, connected to the medium supply device 8.
  • a control valve 9A,... 9F via which the respective medium flow through the lines to the bores of the individual section can be regulated.
  • the medium flows through the throttle bores of the individual sections flow against the direction of movement of the material web in the given direction.
  • the flow through the lines is controlled by means of the control valves 9A,...
  • the material web 2 is deflected via the cylindrical block 3.
  • the various throttle bores are located in the individual sections in the region of the curvature, only the throttle bores of section 5A being shown in FIG. 4, for example. Either compressed air or a liquid can be used as the medium. If the throttle bores are supplied with compressed air in the individual sections, an air film is created between the block 3 and the material web 2. The gaps in front of and behind the bores and to the side of the bores form throttle zones, so that a pressure build-up takes place between the material web 2 and the block 3.
  • the distance of this column from the surface of the block can be varied locally, which is equivalent to the fact that the material web is guided in different radii above the individual sections and thus not only the material web in the desired manner deflected, but can also be deflected, as will be explained in more detail below.
  • Controlled deflection or lateral guidance of the material web can be achieved by the targeted application of the sections 5A,... 5F with compressed air, as will be explained in more detail with reference to FIG. 5.
  • FIG. 4 shows a section through section 5A of block 3 or the carrying nozzle along line II in FIG. 3.
  • the central bore of this sectional illustration shows the cross section of line 7A, from which a channel leads upwards, which opens into section 5A .
  • the throttle bores 4A are designed like a lattice and ensure that pressure builds up in the section 5A and the medium, for example air, emerges from the throttle bores 4A with appropriate pressure and flows against the material web.
  • FIG. 5 schematically shows the deflection of the material web 2, which is normally guided around the block 3 at a constant distance. If the air pressure in each of the sections 5A to 5F of the first embodiment of the guide device 1 is increased in accordance with the air pressure curve 23, the air pressure prevailing in line 7A and section 5A is the lowest and the air pressure prevailing in line 7F and section 5F is greatest highest, whereby the result is that the material web 2 at the right end of the block 3 is the smallest and at the left end of the block 3 the greatest distance from the surface of the block and is thereby deflected from its normal orbit and the position shown as deflected material web 2 'Occupies.
  • FIG. 6 shows a section through a section A of a second embodiment of the guide device.
  • the block or the carrying nozzle is designed as a deflection block 10 with an elliptical cross section.
  • Inside the elliptical deflection block 10 there is a central bore 11, from which radial channels 12A lead to throttle bores 13A in the surface of the deflection block 10.
  • the cross section of the central bore 11 is considerably larger than the cross section of the radial channels 12A, which leads to a corresponding throttling of the medium flow and thus to an increase in pressure of the medium which emerges through the throttle bores 13A of section A of the elliptical deflection block 10.
  • the deflection block 10 of the second embodiment of the guiding device serves primarily to deflect the material web 2 by 180 °.
  • the deflection block 10 looks similar to the block 3 of the first embodiment according to FIG. 3, ie the deflection block 10 is divided into different sections A to F, and a number of throttle bores 13A to 13F are assigned to each section.
  • FIG. 6 only the central bore 11 and the radial channels 12A and the throttle bores 13A of section A are shown in cross section. The remaining sections with their channels and with their central bore are constructed in the same way.
  • gaps 14 and 15 in front of and behind the throttle bores 13A, as seen in the direction of travel of the material web 2. Gaps are also provided to the side of the throttle bores 13A, which together with the gaps 14 and 15 throttle points for form the outflowing medium, so that a pressure build-up between the deflection block 10 and the material web 2 takes place, which ensures that the material web 2 is guided around the surface of the deflection block 10 at a distance.
  • the carrier medium film formed between the deflection block 10 and the material web 2 has a thickness which varies in accordance with the respective medium pressure in the individual channels 12A,... 12F of the sections A to F of the deflection block 10.
  • the deflection block 16 has a parabolic cross section. This embodiment of the guide device is particularly suitable for a web deflection of less than 180 °.
  • the deflection block 16 is also divided into sections A to E, in each of which throttle bores 17A, ... 17F are arranged.
  • the medium for guiding and deflecting the material web 2 can be either compressed air or the respective bath liquid if the material web 2 is passed through a liquid bath, for example an electroplating bath.

Landscapes

  • Advancing Webs (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Knitting Machines (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)

Claims (11)

  1. Dispositif de guidage permettant le guidage, la déviation et/ou le renvoi d'une nappe de matière qui est guidée sur un certain nombre de rouleaux, dispositif de guidage qui est raccordé à un dispositif d'alimentation en fluide, s'étend sur toute la largeur des rouleaux et comporte des orifices par lesquels un courant de fluide passe en direction de la nappe de matière suivant une direction chaque fois préfixée, caractérisé en ce que le dispositif de guidage (1) comprend un bloc (3 ; 10; 16) à surface courbe au-dessus duquel la nappe de matière (2) est guidée à une certaine distance, en ce que, dans la surface du bloc, des orifices (4A, ... 4F; 13A, ... 13F ; 17A, ... 17F) sont ménagés, transversalement à la direction de déplacement de la nappe de matière (2), dans chaque section d'un certain nombre de sections (5A, ... 5F), en ce que, dans chaque section, des orifices sont réunis entre eux et réunis à une tuyauterie (7A, ... 7F) menant au dispositif d'alimentation en fluide (8) et en ce que les sections (5A, ... 5F) sont alimentées au moyen de courants de fluide ayant des vitesses différentes ou avec des débits différents de fluide.
  2. Dispositif de guidage selon la revendication 1, caractérisé en ce que le bloc (3) est cylindrique, en ce que les orifices (4A, ...4F) sont ménagés dans des sections (5A, ...5F) et en ce qu'un nombre préfixé de perçages sont réunis entre eux dans chacune des sections.
  3. Dispositif de guidage selon la revendication 2, caractérisé en ce que les orifices (4A, ...4F) sont ménagés, sous la forme d'orifices d'étranglement, dans une surface (6) qui fait face à la nappe de matière (2) et en ce que cette surface est située à une distance préfixée vis-à-vis de faces en retrait (18) des sections (5A, ...5F) du bloc.
  4. Dispositif de guidage selon la revendication 2, caractérisé en ce que chacune des sections (5A-5F) communique avec le dispositif d'alimentation en fluide (8) par l'intermédiaire d'une tuyauterie (7A-7F) qui est introduite dans le bloc (3) et en ce que, dans chaque tuyauterie (7A, ...7F) et à l'extérieur du bloc (3), il est disposé une soupape de régulation (9A, ...9F) au moyen de laquelle le courant correspondant de fluide envoyé aux orifices de la section associée est réglable.
  5. Dispositif de guidage selon la revendication 1, caractérisé en ce que le bloc est réalisé sous la forme d'un bloc de renvoi (10) à section transversale elliptique.
  6. Dispositif de guidage selon la revendication 5, caractérisé en ce qu'à l'intérieur du bloc elliptique de renvoi (10), des conduits radiaux (12A, ...12F) mènent à des orifices d'étranglement (13A, ...13F) ménagés dans les sections (A à F) de la surface du bloc de renvoi (10), ces conduits radiaux partant d'un passage central respectif (11A,... 11F).
  7. Dispositif de guidage selon la revendication 6, caractérisé en ce que deux passages (14 15) se présentant respectivement en amont et en aval des orifices d'étranglement suivant la direction de déplacement de la nappe de matière (2), ainsi que des passages situés sur les côtés des orifices constituent des zones d'étranglement pour le fluide qui s'écoule, de sorte qu'il s'établit une pression entre le bloc de renvoi (10) et la nappe de matière (2).
  8. Dispositif de guidage selon la revendication 6, caractérisé en ce qu'entre le bloc de renvoi (10) et la nappe de matière (2), il est formé un film de fluide de sustentation dont l'épaisseur varie en fonction de la pression du fluide dans les différents conduits (12A, ...12F).
  9. Dispositif de guidage selon la revendication 1, caractérisé en ce que le bloc, servant de bloc de renvoi (16) pour le renvoi d'une nappe de matière d'une valeur inférieure à 180°, a une section transversale de forme parabolique dans la surface de laquelle des orifices d'étranglement (17A, ...17F) sont ménagés.
  10. Dispositif de guidage selon la revendication 1, caractérisé en ce que le fluide servant au guidage et au renvoi de la nappe de matière (2) est de l'air comprimé.
  11. Dispositif de guidage selon la revendication 1, caractérisé en ce que le fluide servant au guidage et au renvoi de la nappe de matière (2) dans des bains de liquide est constitué par le liquide du bain correspondant.
EP91117662A 1990-10-23 1991-10-16 Dispositif de guidage pour guider, devier et/ou retourner une bande de matériau Expired - Lifetime EP0482500B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4033642A DE4033642A1 (de) 1990-10-23 1990-10-23 Leitvorrichtung zum fuehren, aus- und/oder umlenken einer materialbahn
DE4033642 1990-10-23

Publications (2)

Publication Number Publication Date
EP0482500A1 EP0482500A1 (fr) 1992-04-29
EP0482500B1 true EP0482500B1 (fr) 1994-08-03

Family

ID=6416860

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91117662A Expired - Lifetime EP0482500B1 (fr) 1990-10-23 1991-10-16 Dispositif de guidage pour guider, devier et/ou retourner une bande de matériau

Country Status (5)

Country Link
US (1) US5353979A (fr)
EP (1) EP0482500B1 (fr)
JP (1) JPH05124759A (fr)
KR (1) KR920007909A (fr)
DE (2) DE4033642A1 (fr)

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DE4033642A1 (de) 1992-04-30
JPH05124759A (ja) 1993-05-21
US5353979A (en) 1994-10-11
EP0482500A1 (fr) 1992-04-29
DE59102427D1 (de) 1994-09-08
KR920007909A (ko) 1992-05-27

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