EP1792861B1 - Vacuum belt feeding apparatus for guiding a moving web - Google Patents

Vacuum belt feeding apparatus for guiding a moving web Download PDF

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Publication number
EP1792861B1
EP1792861B1 EP06024086A EP06024086A EP1792861B1 EP 1792861 B1 EP1792861 B1 EP 1792861B1 EP 06024086 A EP06024086 A EP 06024086A EP 06024086 A EP06024086 A EP 06024086A EP 1792861 B1 EP1792861 B1 EP 1792861B1
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EP
European Patent Office
Prior art keywords
conveying device
ejector
belt conveying
gap
vacuum belt
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.)
Not-in-force
Application number
EP06024086A
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German (de)
French (fr)
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EP1792861A2 (en
EP1792861A3 (en
Inventor
Andreas Pesch
Bernhard Schmitz
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Andritz Kuesters GmbH
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Andritz Kuesters GmbH
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Publication date
Application filed by Andritz Kuesters GmbH filed Critical Andritz Kuesters GmbH
Publication of EP1792861A2 publication Critical patent/EP1792861A2/en
Publication of EP1792861A3 publication Critical patent/EP1792861A3/en
Application granted granted Critical
Publication of EP1792861B1 publication Critical patent/EP1792861B1/en
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Anticipated expiration legal-status Critical

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H20/00Advancing webs
    • B65H20/10Advancing webs by a feed band against which web is held by fluid pressure, e.g. suction or air blast
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21GCALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00Other accessories for paper-making machines
    • D21G9/0063Devices for threading a web tail through a paper-making machine

Definitions

  • the invention relates to a vacuum belt conveyor device for guiding a moving web, in particular a web insertion strip of a paper or board web, according to the preamble of claim 1.
  • Vacuum belt conveyors for guiding a traveling web are used in various industrial plants to securely hold a web in transit. This is especially true for paper and board machines, where the web is transferred from one machine section to another machine section, for example from the wet end to the dryer section or from the dryer section to the finishing section.
  • vacuum belt conveyors in paper or board machines to facilitate threading the paper or board web into a machine for making, finishing or further processing such a web.
  • a narrow ribbon or introduction strip is separated from the running web.
  • This tape is transferred by means of the vacuum belt conveyor, for example, from the end of a machine section to the inlet area of a subsequent machine section.
  • the conveyor device comprises an air-permeable, endless conveyor belt, which runs over two rollers and a suction box or vacuum box. As a result, the insertion strip is sucked and transported to the conveyor belt.
  • a vacuum blower is provided to create vacuum or negative pressure within the suction box.
  • the vacuum blower comprises an impeller having an exhaust passage.
  • the impeller is driven by a suitable motor.
  • the suction box has one or more suction openings, via which the vacuum blower generates negative pressure in the interior of the suction box.
  • a disadvantage is the complex and large-scale construction, which is also maintenance-prone and expensive to manufacture and in operation. The sealing of the suction box is also difficult.
  • a device for transporting and guiding the Bruendauf arrangementsbandes in a paper machine which consists of a arranged around two or more guide rollers conveyor belt, which is permeable to air and within which loop devices are mounted, with which at the one run of the conveyor belt, with the Endiller technologicalband is transported, a negative pressure effect is achieved, whereby the Endiller arrangementsband is stapled to the said run and adhered to it.
  • the negative pressure is generated by air blower means mounted within the loop which comprise guide plates which extend substantially parallel to the plane of the conveyor belt and by which air blows can create a dynamic negative pressure action with which the final conveyor belt is tacked to the conveyor belt.
  • the disadvantage is that for blowing the guide plates a fairly large amount of air is required, which is to be diverted and leads to undesirable blowing currents in the area around the device.
  • the object of the invention is therefore to provide a vacuum belt conveyor device for guiding a running web, which is structurally simple and takes up little space.
  • the suction power is high and adjustable in the longitudinal and transverse directions. Due to the bypass that can be integrated with the ejector, it can be adjusted to a specific pressure difference. It is thus made a negative pressure control directly on the ejector, so that in the vicinity of the at least one ejector, a uniform pressure distribution is ensured particularly advantageous.
  • the bypass can preferably be fed with air via a regulating device, in order to avoid falling below a certain low-pressure level in the region of the inlet side.
  • the system is then self-regulating, because the bypass causes the flow conditions in the bypass to the pressure conditions on the inlet side can adjust.
  • the regulating device can be formed, for example, by a flap, a throttle or a valve.
  • the at least one bypass may be structurally integrated into a wall of the ejector or into an insert for the ejector.
  • the at least one bypass is placed in front of the inlet of the ejector.
  • a bypass In the transport direction can also be arranged in front of and behind the intake of the ejector, a bypass.
  • the bypass is preferably slot-shaped.
  • the ejector is preferably designed as a ring-gap ejector or long-gap ejector.
  • a nozzle row arrangement of at least one long-gap ejector extends transversely to the strip running direction and generates an air flow perpendicular to the band. The air flow is then simply downwards derivable, whereby obstructions are minimized by unwanted air currents in the area of the device.
  • a gap space of the at least one ejector preferably has a section with a narrowed cross section in order to achieve high efficiency. If a lower efficiency is sufficient, the gap space can also be formed without a cross-sectional constriction.
  • the at least one ejector may also operate in conjunction with a suction space, for which purpose a partition may be provided within the loop.
  • the partition is preferably arranged in the longitudinal direction of the conveyor belt and at a distance below the run, which is provided for holding the web.
  • an intake space above the dividing wall is separated from an outflow space below the dividing wall.
  • the outflow space is formed in an area above the returning other strand and may be formed open or closed to the outside. If a plurality of ejectors are arranged one behind the other in the longitudinal direction, it is also possible to provide transverse dividing walls which surround the Intake and possibly the outflow compartment divided into several successively arranged rooms. Selectable vacuum profiles along the conveyor belt are adjustable in this way.
  • a passage can be provided in the latter, which passage is provided with an adjustable regulating device, in particular a throttle.
  • a flow rate can be determined and thus set a maximum vacuum level.
  • a control in the vicinity of an ejector through the integrated at least one bypass can be done by the throttle in the remote area, an additional adjustment of the pressure conditions.
  • the arrangement of the at least one ejector can be done vertically working to the conveyor belt or at an angle to the conveyor belt.
  • the at least one ejector may have a gap space, which has a cross-sectional widening on the outflow side.
  • the outflowing air can thereby be given a better distribution.
  • the at least one ejector may have a gap whose flow path length is selectable. Consequently, the gap space can not only be used to draw in air for generating negative pressure, but at the same time can also be used for targeted removal of the air from the area of application of negative pressure.
  • the air jet injector may be arranged in a convergingly formed inlet region of the at least one ejector.
  • the orientation of the inlet region of the ejector or to the direction of the conveyor belt is selectable.
  • the inlet region can be arranged transversely or obliquely to the running direction or in the direction of travel, wherein with a plurality of ejectors, these can be arranged at a distance from or directly adjacent to one another in order to form selectable negative pressure fields.
  • selectable negative pressure fields For example, if several long-gap ejectors form a negative pressure strip in the running direction in the running direction, only one row of long-gap ejectors, for example a median strip, can be provided or several rows of long-gap ejectors can be arranged parallel to one another and spaced apart from one another, for example two edge strips.
  • Fig, 1 shows a vacuum belt conveyor 1 for guiding a moving web 2, in particular a web insertion strip of a paper or board web.
  • the vacuum belt conveyor device 1 comprises guide rollers 3 and 4, between which a conveyor belt 5 is arranged.
  • the conveyor belt 5 is endlessly guided in a loop 8 with a top strand 6 and a bottom strand 7, such as in Fig. 1 shown.
  • the conveyor belt 5 is permeable to air and consists of a cloth with sufficient permeability or a material web with hole structure.
  • the device 9 for applying a negative pressure is formed by means of at least one ejector 10, 11.
  • the ejector 10, 11 may have a polygonal or round design.
  • the at least one ejector 10, 11 is designed as a long-gap ejector.
  • the ejector 10, 11 is designed as a ring gap ejector.
  • the at least one long-gap ejector 10, 11 in each case has an air jet injector 12, 13 with a multiplicity of air outlet nozzles 14 along the inlet side 15, 16 of the extended gap 17, 18 and is positioned on the inlet side at a distance below the inside of the runway 6 provided for holding the web.
  • subsequent supply lines 21, 22 of the air jet injector 12, 13 of the at least one long-gap ejector 10, 11 fed by an air source, not shown, in order to inject air into the associated extended nip 17, 18 can.
  • the fed air flows at high speed through the air outlet nozzles 14, whereby air is sucked in on the inlet side 15, which is located in the head-side environment of the at least one long-gap ejector 10, 11.
  • a negative pressure on the inside of the run 6 can be applied by one or more air nozzles are mounted below the belt 5.
  • the pressure of the supplied air is adjustable, which can influence the suction power. If a plurality of long-gap ejectors 10, 11 are arranged one behind the other in the running direction, they can receive the same or different air supply, in order to thereby design individually adjustable suction power profiles in the transport direction T.
  • the long-gap ejector 10 has a substantially rectangular shape and has an air jet injector 12.
  • the air jet injector 12 is formed by a nozzle 19, which is arranged in the gap longitudinal direction and generates an air flow in the gap 20 of the extended gap 17.
  • the nozzle assembly 19 is preferably recessed with respect to the inlet side 15, whereby the air sucked in on the inlet side is directed into the gap 20.
  • the air jet injector 12 is seated in a converging inlet region 23 of the long-gap ejector 10, wherein the short side edges 24, 25 of the extended-nip 17 are preferably rounded.
  • the extended nip 17 of the long-gap ejector 10 can delimit the gap 20 with parallel surfaces from the inlet side 15 to an outlet side 26, that is to say extend without a narrowed cross-section (cf. Fig. 12a, 12b ). It is preferred to form the gap 20 with a narrowed cross-section for a high efficiency.
  • the inlet region 23 with converging side surfaces then extends below the air jet injector 12. The constriction in the cross section of the extended nip 17 promotes the formation of a closed flow and thus an advantageous sealing of the Beerstrahlejektors 12.
  • the suction of a long-gap ejector 10, 11 at the inlet side 15 is controllable via the fed air flow and by the shape of the extended gap 17 between the inlet side 15 and outlet side 26. DieShuff des Long gap 17 in the flow direction is selectable and opens up an advantageous discharge of air.
  • the extended gap 17 is preferably formed with an enlarged cross-sectional portion 40, whereby the outflow behavior of the long-gap ejector 10 is improved with respect to a wide air outlet distribution.
  • the outflowing air can be diverted away from the device 1 by additional or alternative means, possibly also by exhaust air ducts.
  • the extended nip 17 preferably has a section with parallel side surfaces, which can make up about 50 to 80% of the total length of the extended nip 17 in the flow direction between inlet side 15 and outlet side 26.
  • the extended nip 17 thus forms a guide channel for the air flow with a selectable flow path length.
  • a vacuum belt conveyor device comprises the device 9 for applying negative pressure two long-gap ejectors 10, 11, which are arranged in the transport direction T at a distance one behind the other.
  • the number of juxtaposed long-gap ejectors 10, 11 can be selected.
  • the distance from the inside of Trumms 6 is also selectable and depends on the intake. A minimum distance ensures that a suction area, although local, but sufficiently flat.
  • the extent of the extended nip 17 in the longitudinal direction of the gap can be selected as a function of a width of the conveyor belt 5, so that it is sucked over the entire width of the conveyor belt 5.
  • the long-gap ejector (s) 10, 11 can be arranged at selectable locations, that is to say be positioned where a suction characteristic is desired.
  • the air jet injector 12 with the associated nozzle assembly 19 preferably extends transversely to the strip running direction T and generates an air flow perpendicular to the belt 5.
  • the long-gap ejectors 10, 11 are arranged to operate perpendicularly to the transport belt 5.
  • a holder 27 For positioning the at least one long-gap ejector 10, 11, a holder 27 is provided, which holds the long-gap ejectors 10, 11 stationary in the loop 8.
  • the long-gap ejectors 10, 11 can furthermore be arranged freestanding in the loop 8.
  • the holder 27 may be formed by a frame of the device 1, in which the guide rollers 3, 4 are mounted.
  • the conveyor belt 5 is moved in the transport direction T by at least one driven deflection roller 3, 4.
  • a drive motor 28 is provided for the deflection roller 3.
  • support grid not shown, may be provided.
  • At least one bypass 41, 42 is integrated from the outer space to the inlet side 15, 16 on the ejector, which is designed here as a long-gap ejector 10, 11.
  • the at least one bypass 41, 42 is placed in a wall 43, 44 of the long-gap ejector 10, 11 and preferably extends from a side region of the wall 43, 44 within a half of the gap 17, 18 facing away from the inlet side 15, 16 toward the inlet side 15 16. From an outside space with higher pressure then air can flow to the inlet side 15, where an adjustable negative pressure is applied.
  • the at least one bypass 41, 42 preferably has a regulating device 45 for a self-adjusting adjustment of a pressure difference.
  • the regulating device 45 here is a spring-loaded flap which opens the bypass 41, 42 in an adjustable manner when a certain level of negative pressure is reached at the inlet side 15.
  • the at least one bypass 41, 42 is preferably slot-shaped and terminates at the inlet side 15, 16 preferably in the transport direction T in front of and / or behind the gap 17, 18 of the long-gap ejectors 10, 11.
  • Fig. 2 shows the regulator 45 closed, ie the bypass 41, 42 is inactivated.
  • the regulator 45 may alternatively be formed by a throttle or a valve.
  • a partition wall 29 is disposed within the loop 8.
  • the partition wall 29 separates an intake space 33, 34, in which the inlet side 15 of the at least one long-gap ejector 10, 11 is arranged with its respective inlet, from an outflow space 35, 36, in which the outlet side 26 of the at least one long-gap ejector 10, 11 with its respective outlet is arranged.
  • the partition wall 29 preferably extends substantially parallel to the conveyor belt 5.
  • the suction chamber 33, 34 preferably forms an upper chamber and the outflow space 35, 36 a lower chamber, which are bounded laterally by cover plates 31, 32 with respect to the guide rollers 3, 4th
  • the suction chamber 33, 34 is bounded at the top by the run 6 of the air-permeable conveyor belt 5.
  • the limitation can be made upward through a perforated plate on which the run 6 runs out.
  • the distribution as well as the opening widths of the holes allow an influence on the negative pressure characteristic on the inside of the run 6.
  • the outflow space 35, 36 is bounded below by the returning Trumm 7.
  • the at least one long-gap ejector 10, 11 sucks in the air from the respective intake space 33, 34, whereby an intake field corresponding to the intake space 33, 34 is applied to the inside of the run 6.
  • the distance of the inlet side 15 of the at least one long-gap ejector 10, 11 from the inside of the run 6 can be selected to be greater than in the free-standing long-gap ejector 10, 11 according to Fig. 2 .
  • the inlet side 15 is preferably positioned in a middle region of the suction space 33, 34.
  • Fig. 6b The operation of the at least one bypass 41, 42, in the representation of Fig. 6a is activated is in Fig. 6b shown in detail.
  • the regulating device in the form of a flap 45 is pivoted against the bias of a spring 46, whereby the bypass 41, 42 is opened. Air from the outer space, in this case the outflow space 35, flows through the bypass 41, 42 to the inlet side 15, 16 and the suction space 33.
  • the flap 45 opens when the pressure difference between the outer space, here the outflow space 35, and the inlet side 15, 16 the long-gap ejectors 10, 11 exceeds an adjustable value, so that the bypass 41, 42 exercises its balancing function. As a result, no further negative pressure builds up from a certain negative pressure value, since the bypass flow now corresponds to the suction flow, as illustrated by the flow arrows shown.
  • Fig. 6c shows an alternative embodiment of the bypass 41, 42.
  • the bypass 41, 42 is placed here in an insert 48 for the long-gap ejector 10, 11.
  • the regulating device is a flap 45, which is fastened to a resistance-compensated joint 47. By the articulation of the flap 45 in a negative pressure region, for example, the suction chamber 33, the flap 45 opens to the outside and not in the bypass 41, 42. The effect corresponds to the way to Fig. 6b described mode of action.
  • a slot shape of the bypass 41, 42 ensures during the compensation that, for example, in the transverse direction to the conveyor belt 5 always forms a uniform pressure distribution.
  • the system is self-regulating because the bypass 41, 42 causes the flow conditions in the bypass 41, 42 to adjust to the pressure ratios across the bypass 41, 42.
  • an adjustable throttle 37, 38 is arranged in the partition wall 29.
  • About the throttle 37, 38 can flow between a Intake space 33, 34 and an outflow space 35, 36 determines and thus a maximum vacuum level in a suction chamber 33, 34 are set.
  • a maximum negative pressure in the suction space 33, 34 can be defined via such a bypass between intake space 33, 34 and outflow space 35, 36. From a certain negative pressure value, no further negative pressure builds up, since then the bypass flow via the throttle 37, 38 corresponds to the suction flow. A certain pressure difference is adjusted.
  • the vacuum level is also adjustable. The risk that especially wet paper or board webs are damaged on the conveyor belt 5 by over-suction, therefore, does not exist.
  • Each intake chamber 33, 34 with associated outflow space 35, 36 is preferably associated with a throttle 37, 38.
  • the drive power of the motor 28 can be kept small by limiting the vacuum level.
  • the bypass 41 in the vicinity compensate, while the throttle 37, 38 allows this in a long-range.
  • the long-gap ejectors 10, 11 here preferably have only one bypass 41 in the transport direction T in front of the gap of the ejector 10, 11.
  • the throttle 37, 38 is in each case arranged in the transport direction T behind the long-gap ejector 10, 11.
  • the combination of two compensation functions optimizes the even pressure distribution for holding and guiding the paper and board web depending on the moisture content. Incidentally, the above statements apply to the first and second embodiments accordingly.
  • FIG. 8 illustrated fourth embodiment of the vacuum belt conveyor device 1 differs from the in Fig. 7 illustrated third embodiment in that the at least one long-gap ejector 10, 11 is not arranged perpendicular to the conveyor belt 5 working, but is arranged working at an angle to the conveyor belt.
  • the long-gap ejectors 10, 11 are inclined or tilted to the transport plane of the conveyor belt 5.
  • the suction is the outflow with respect to the transport direction T leading or trailing formable.
  • the in the Fig. 9 to 11 illustrated embodiments of the vacuum belt conveyor device 1 relate to different arrangements of at least two long-gap ejectors 10, 11 with respect to the running direction T.
  • a first long-gap ejector 10 is positioned transversely to the direction of travel T, while a second spaced-apart long-gap ejector 11 is arranged obliquely to the transport direction T.
  • the order can also be reversed.
  • Both long-gap ejectors 10, 11 are arranged obliquely to the transport direction T.
  • the angle to the transport direction T is selectable depending on the choice of the vacuum profile that can be generated thereby.
  • the long-gap ejectors 10, 11 are arranged in a row one behind the other to form a suction strip 39.
  • This suction strip 39 can, as in FIG Fig. 11 represented form a median strip.
  • an edge strip or edge strips on both sides may be provided.
  • the Fig. 12a shows an eighth embodiment of the vacuum belt conveyor device 1, which differs from the above embodiments in that the extended nip 17, 18 has no cross-sectional constriction, that has parallel side walls. The efficiency is lower, so that the long-gap ejector 10, 11 is preferably arranged closer to the inside of the run 6 of the conveyor belt 5.
  • the comments on the first embodiment according to Fig. 2 corresponding.
  • the Fig. 12b shows a ninth embodiment of the vacuum belt conveyor device 1, which differs from the first embodiment according to Fig. 1 and 2 characterized in that the ejectors 10, 11 are annular gap ejectors.
  • the long-gap ejectors of the exemplary embodiments two to eight can also be replaced by ring-gap ejectors.
  • the vacuum belt conveyor device 1 can also operate rotated through 180 °, i. the negative pressure at the returning Trumm be applied with appropriate rotation of the ejectors and reversing the transport direction.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Advancing Webs (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Belt Conveyors (AREA)

Abstract

Conveyor for a traveling web comprises an air-permeable endless belt (5) and ejectors (10, 11) for applying a vacuum to the upper strand of the belt to hold the web (2) on the belt. Each ejector comprises an air jet injector (12) with air outlet nozzles along the entry side of a slit (17, 18) and bypasses (41, 42) from the outside to the entry side.

Description

Die Erfindung betrifft eine Unterdruck-Bandfördervorrichtung zum Führen einer laufenden Bahn, insbesondere eines Bahneinführungsstreifens einer Papier- oder Kartonbahn, nach dem Oberbegriff des Anspruchs 1.The invention relates to a vacuum belt conveyor device for guiding a moving web, in particular a web insertion strip of a paper or board web, according to the preamble of claim 1.

Unterdruck-Bandfördervorrichtungen zum Führen einer laufenden Bahn werden bei unterschiedlichen Industrieanlagen eingesetzt, um eine Bahn auf einem Transportweg sicher halten zu können. Dies gilt insbesondere für Papier- und Kartonmaschinen, wo die Bahn von einer Maschinenpartie zu einer anderen Maschinenpartie überführt wird, beispielsweise von der Nasspartie zur Trockenpartie oder von der Trockenpartie zur Veredelungspartie.Vacuum belt conveyors for guiding a traveling web are used in various industrial plants to securely hold a web in transit. This is especially true for paper and board machines, where the web is transferred from one machine section to another machine section, for example from the wet end to the dryer section or from the dryer section to the finishing section.

Aus DE 100 09 188 A1 ist bekannt, bei Papier- oder Kartonmaschinen Unterdruck-Bandfördervorrichtungen zu benutzen, um das Einfädeln der Papier- oder Kartonbahn in eine Maschine zur Herstellung oder Veredelung oder Weiterverarbeitung einer solchen Bahn zu erleichtern. Bei der Inbetriebnahme einer Papiermaschine oder bei einem Wiederanfahren nach einem Bahnriss wird ein schmaler Bändel oder Einführungsstreifen von der laufenden Bahn abgetrennt. Dieser Bändel wird mit Hilfe der Unterdruck-Bandfördervorrichtung beispielsweise vom Ende einer Maschinensektion zum Einlaufbereich einer nachfolgenden Maschinensektion überführt. Dazu umfasst die Fördervorrichtung ein luftdurchlässiges, endloses Förderband, das über zwei Rollen und über einen Saugkasten oder Unterdruckkasten läuft. Infolgedessen wird der Einführungsstreifen an das Förderband angesaugt und transportiert. Um innerhalb des Saugkastens Vakuum oder Unterdruck zu erzeugen, ist ein Unterdruckgebläse vorgesehen. Das Unterdruckgebläse umfasst ein Laufrad, das einen Auslasskanal aufweist. Das Laufrad wird durch einen geeigneten Motor angetrieben. Der Saugkasten hat eine oder mehrere Absaugöffnungen, über die das Unterdruckgebläse Unterdruck in dem Inneren des Saugkastens erzeugt. Nachteilig ist der aufwendige und großformatige Aufbau, der zudem wartungsanfällig sowie teuer in der Herstellung und im Betrieb ist. Die Abdichtung des Saugkastens ist zudem schwierig.Out DE 100 09 188 A1 It is known to use vacuum belt conveyors in paper or board machines to facilitate threading the paper or board web into a machine for making, finishing or further processing such a web. When a paper machine is put into operation or when it starts again after a web break, a narrow ribbon or introduction strip is separated from the running web. This tape is transferred by means of the vacuum belt conveyor, for example, from the end of a machine section to the inlet area of a subsequent machine section. For this purpose, the conveyor device comprises an air-permeable, endless conveyor belt, which runs over two rollers and a suction box or vacuum box. As a result, the insertion strip is sucked and transported to the conveyor belt. To create vacuum or negative pressure within the suction box, a vacuum blower is provided. The vacuum blower comprises an impeller having an exhaust passage. The impeller is driven by a suitable motor. The suction box has one or more suction openings, via which the vacuum blower generates negative pressure in the interior of the suction box. A disadvantage is the complex and large-scale construction, which is also maintenance-prone and expensive to manufacture and in operation. The sealing of the suction box is also difficult.

Aus DE 35 24 006 A1 ist eine Vorrichtung zum Transport und zur Führung des Bahnendaufführungsbandes in einer Papiermaschine bekannt, die aus einem um zwei oder mehrere Umlenkwalzen angeordneten Transportband besteht, das luftdurchlässig ist und innerhalb dessen Schleife Vorrichtungen angebracht sind, mit denen an dem einen Trumm des Transportbandes, mit dem das Endaufführungsband transportiert wird, eine Unterdruckwirkung erreicht wird, wodurch das Endaufführungsband an das genannte Trumm geheftet und daran festgehalten wird. Der Unterdruck wird erzeugt durch innerhalb der Schleife angebrachte Luftgebläseeinrichtungen, die Leitplatten umfassen, die sich im Wesentlichen parallel zur Ebene des Transportbandes erstrecken und an denen sich durch Luftblasungen eine dynamische Unterdruckwirkung erzeugen lässt, mit der das Endaufführungsband an das Transportband geheftet wird. Nachteilig ist, dass zum Anblasen der Leitplatten eine ziemlich große Menge an Luft erforderlich ist, die abzuleiten ist und zu unerwünschten Blasströmen im Bereich um die Vorrichtung führt.Out DE 35 24 006 A1 a device for transporting and guiding the Bahnendaufführungsbandes in a paper machine is known, which consists of a arranged around two or more guide rollers conveyor belt, which is permeable to air and within which loop devices are mounted, with which at the one run of the conveyor belt, with the Endaufführband is transported, a negative pressure effect is achieved, whereby the Endaufführungsband is stapled to the said run and adhered to it. The negative pressure is generated by air blower means mounted within the loop which comprise guide plates which extend substantially parallel to the plane of the conveyor belt and by which air blows can create a dynamic negative pressure action with which the final conveyor belt is tacked to the conveyor belt. The disadvantage is that for blowing the guide plates a fairly large amount of air is required, which is to be diverted and leads to undesirable blowing currents in the area around the device.

Aus DE 299 24 658 U1 ist schließlich eine Vorrichtung zum Befördern und Führen eines Einführstreifens einer Bahn bei einer Papiermaschine der genannten Art bekannt, bei der die Einrichtung zur Erzeugung einer Unterdruckwirkung gekrümmte Luftströmungsführungsflächen längs des Transportbandes aufweist, die in Verbindung mit Foil-Köpfen einen Unterdruck erzeugen. Durch ein Einstellen des Winkels der Luftströmungsführungsflächen kann die Höhe des Unterdrucks reguliert werden. Nachteilig sind entstehende Überdruckbereiche vor den Foil-Köpfen.Out DE 299 24 658 U1 Finally, there is known a device for conveying and guiding an insertion strip of a web in a paper machine of the type mentioned, in which the device for generating a negative pressure effect has curved air flow guide surfaces along the conveyor belt, which generate a negative pressure in connection with Foil heads. By adjusting the angle of the air flow guide surfaces, the height of the negative pressure can be regulated. The disadvantages are overpressure areas in front of the foil heads.

Aufgabe der Erfindung ist es daher, eine Unterdruck-Bandfördervorrichtung zum Führen einer laufenden Bahn zu schaffen, die konstruktiv einfach ist und wenig Platz in Anspruch nimmt.The object of the invention is therefore to provide a vacuum belt conveyor device for guiding a running web, which is structurally simple and takes up little space.

Diese Aufgabe wird durch die Merkmale des kennzeichnenden Teils des Anspruchs 1 gelöst.This object is solved by the features of the characterizing part of claim 1.

Hierdurch wird eine Unterdruck-Bandfördervorrichtung zum Führen einer laufenden Bahn, insbesondere eines Bahneinführungsstreifens, geschaffen, deren Vorrichtung zum Aufbringen eines Unterdrucks neben einer geringen Baugröße eine wählbare Bauform besitzt, nämlich eine eckige oder runde Bauform. Dabei ist die Saugleistung hoch und einstellbar in Längs- und Querrichtung. Durch den an den Ejektor integrierbaren Bypass kann dieser auf eine bestimmte Druckdifferenz eingeregelt werden. Es wird also eine Unterdruckregelung direkt am Ejektor vorgenommen, so dass im Nahbereich des mindestens einen Ejektors eine gleichmäßige Druckverteilung besonders vorteilhaft gewährleistet ist.In this way, a vacuum belt conveyor device for guiding a moving web, in particular a web insertion strip, created whose device for applying a negative pressure next to a small size has a selectable design, namely a square or round design. The suction power is high and adjustable in the longitudinal and transverse directions. Due to the bypass that can be integrated with the ejector, it can be adjusted to a specific pressure difference. It is thus made a negative pressure control directly on the ejector, so that in the vicinity of the at least one ejector, a uniform pressure distribution is ensured particularly advantageous.

Der Bypass ist vorzugsweise über eine Reguliereinrichtung mit Luft speisbar, um im Bereich der Eintrittsseite ein Unterschreiten eines bestimmten Unterdruckniveaus zu vermeiden. Das System ist dann selbstregelnd, weil der Bypass bewirkt, dass sich die Strömungsverhältnisse im Bypass den Druckverhältnissen an der Eintrittsseite anpassen können. Die Reguliereinrichtung kann beispielsweise von einer Klappe, einer Drossel oder einem Ventil gebildet werden.The bypass can preferably be fed with air via a regulating device, in order to avoid falling below a certain low-pressure level in the region of the inlet side. The system is then self-regulating, because the bypass causes the flow conditions in the bypass to the pressure conditions on the inlet side can adjust. The regulating device can be formed, for example, by a flap, a throttle or a valve.

Der mindestens eine Bypass kann bautechnisch bedingt in eine Wandung des Ejektors oder in einen Einsatz für den Ejektor integriert sein.The at least one bypass may be structurally integrated into a wall of the ejector or into an insert for the ejector.

Vorzugsweise ist der mindestens eine Bypass vor den Einlass des Ejektors gelegt. In Transportrichtung kann auch jeweils vor und hinter dem Ansaugbereich des Ejektors ein Bypass angeordnet sein. Der Bypass ist vorzugsweise schlitzförmig.Preferably, the at least one bypass is placed in front of the inlet of the ejector. In the transport direction can also be arranged in front of and behind the intake of the ejector, a bypass. The bypass is preferably slot-shaped.

Der Ejektor ist vorzugsweise als Ringspaltejektor oder Langspaltejektor ausgebildet.The ejector is preferably designed as a ring-gap ejector or long-gap ejector.

Bevorzugt erstreckt sich eine Düsenreihenanordnung eines mindestens einen Langspaltejektors quer zur Bandlaufrichtung und erzeugt eine Luftströmung senkrecht zum Band. Die Luftströmung ist dann auch einfach nach unten ableitbar, wodurch Behinderungen durch unerwünschte Luftströmungen im Bereich der Vorrichtung minimiert werden.Preferably, a nozzle row arrangement of at least one long-gap ejector extends transversely to the strip running direction and generates an air flow perpendicular to the band. The air flow is then simply downwards derivable, whereby obstructions are minimized by unwanted air currents in the area of the device.

Bevorzugt weist ein Spaltraum des mindestens einen Ejektors einen Abschnitt mit einem eingeengten Querschnitt auf, um einen hohen Wirkungsgrad zu erreichen. Ist ein geringerer Wirkungsgrad ausreichend, kann der Spaltraum auch ohne Querschnittsverengung ausgebildet sein.A gap space of the at least one ejector preferably has a section with a narrowed cross section in order to achieve high efficiency. If a lower efficiency is sufficient, the gap space can also be formed without a cross-sectional constriction.

Der mindestens eine Ejektor kann auch in Verbindung mit einem Ansaugraum arbeiten, wozu eine Trennwand innerhalb der Schleife vorgesehen sein kann. Die Trennwand ist vorzugsweise in Längsrichtung des Transportbandes und mit Abstand unterhalb des Trumms, das zum Festhalten der Bahn vorgesehen ist, angeordnet. Dadurch wird ein Ansaugraum oberhalb der Trennwand von einem Abströmraum unterhalb der Trennwand getrennt. Der Abströmraum wird in einem Bereich oberhalb des zurücklaufenden anderen Trumms gebildet und kann nach außen offen oder geschlossen ausgebildet sein. Sind mehrere Ejektoren in Längsrichtung hintereinander angeordnet, können ferner auch Quertrennwände vorgesehen sein, die den Ansaugraum und gegebenenfalls den Abströmraum in mehrere hintereinander angeordnete Räume unterteilt. Wählbare Unterdruckprofile längs des Transportbandes sind auf diese Weise einstellbar.The at least one ejector may also operate in conjunction with a suction space, for which purpose a partition may be provided within the loop. The partition is preferably arranged in the longitudinal direction of the conveyor belt and at a distance below the run, which is provided for holding the web. As a result, an intake space above the dividing wall is separated from an outflow space below the dividing wall. The outflow space is formed in an area above the returning other strand and may be formed open or closed to the outside. If a plurality of ejectors are arranged one behind the other in the longitudinal direction, it is also possible to provide transverse dividing walls which surround the Intake and possibly the outflow compartment divided into several successively arranged rooms. Selectable vacuum profiles along the conveyor belt are adjustable in this way.

Ist eine Trennwand vorgesehen, kann in dieser ein Durchgang vorgesehen sein, der mit einer einstellbaren Reguliereinrichtung, insbesondere einer Drossel, versehen ist. Über die Drossel kann eine Durchflussmenge bestimmt und damit ein maximales Unterdruckniveau eingestellt werden. Neben einer Regelung im Nahbereich eines Ejektors durch den integrierten mindestens einen Bypass kann durch die Drossel im Fernbereich eine zusätzliche Einstellung der Druckverhältnisse erfolgen.If a partition wall is provided, a passage can be provided in the latter, which passage is provided with an adjustable regulating device, in particular a throttle. About the throttle, a flow rate can be determined and thus set a maximum vacuum level. In addition to a control in the vicinity of an ejector through the integrated at least one bypass can be done by the throttle in the remote area, an additional adjustment of the pressure conditions.

Die Anordnung des mindestens einen Ejektors kann senkrecht arbeitend zum Transportband erfolgen oder in einem Winkel zum Transportband.The arrangement of the at least one ejector can be done vertically working to the conveyor belt or at an angle to the conveyor belt.

Der mindestens eine Ejektor kann einen Spaltraum besitzen, der abströmseitig eine Querschnittserweiterung aufweist. Die ausströmende Luft kann hierdurch eine bessere Verteilung erfahren.The at least one ejector may have a gap space, which has a cross-sectional widening on the outflow side. The outflowing air can thereby be given a better distribution.

Der mindestens eine Ejektor kann einen Spaltraum besitzen, dessen Strömungsweglänge wählbar ist. Der Spaltraum kann folglich nicht nur zum Ansaugen von Luft zur Unterdruckerzeugung dienen, sondern kann gleichzeitig auch zum gezielten Wegführen der Luft vom Bereich des Aufbringens von Unterdruck eingesetzt werden. Um das Ansaugen weiter zu verbessern, kann der Luftstrahlinjektor in einem konvergierend gestalteten Eintrittsbereich des mindestens einen Ejektors angeordnet sein.The at least one ejector may have a gap whose flow path length is selectable. Consequently, the gap space can not only be used to draw in air for generating negative pressure, but at the same time can also be used for targeted removal of the air from the area of application of negative pressure. In order to further improve suction, the air jet injector may be arranged in a convergingly formed inlet region of the at least one ejector.

Die Ausrichtung des Eintrittsbereiches des oder der Ejektoren zur Laufrichtung des Transportbandes ist wählbar. Der Eintrittsbereich kann quer oder schräg zur Laufrichtung oder in Laufrichtung angeordnet sein, wobei bei mehreren Ejektoren diese mit Abstand oder unmittelbar benachbart zueinander angeordnet sein können, um wählbare Unterdruckfelder auszubilden. Insbesondere dann, wenn mehrere Langspaltejektoren in Laufrichtung einen Unterdruckstreifen in Laufrichtung bilden, kann nur eine Reihe aus Langspaltejektoren, beispielsweise ein Mittelstreifen, vorgesehen sein oder mehrere Reihen von Langspaltejektoren parallel und beabstandet zueinander angeordnet sein, beispielsweise zwei Randstreifen.The orientation of the inlet region of the ejector or to the direction of the conveyor belt is selectable. The inlet region can be arranged transversely or obliquely to the running direction or in the direction of travel, wherein with a plurality of ejectors, these can be arranged at a distance from or directly adjacent to one another in order to form selectable negative pressure fields. In particular, if several long-gap ejectors form a negative pressure strip in the running direction in the running direction, only one row of long-gap ejectors, for example a median strip, can be provided or several rows of long-gap ejectors can be arranged parallel to one another and spaced apart from one another, for example two edge strips.

Weitere Ausgestaltungen der Erfindung sind der nachfolgenden Beschreibung und den Unteransprüchen zu entnehmen.Further embodiments of the invention are described in the following description and the dependent claims.

Die Erfindung wird nachstehend anhand der in den beigefügten Abbildungen dargestellten Ausführungsbeispiele näher erläutert.

  • Fig. 1 zeigt schematisch eine Draufsicht einer Unterdruck-Bandfördervorrichtung,
  • Fig. 2 zeigt einen Schnitt A-A nach Fig. 1 für eine Unterdruck-Bandfördervorrichtung gemäß einem ersten Ausführungsbeispiel,
  • Fig. 3 zeigt schematisch eine Draufsicht eines Langspaltejektors der Unterdruck-Bandfördervorrichtung gemäß Fig. 2,
  • Fig. 4a zeigt einen Schnitt B-B des Langspaltejektors gemäß Fig. 3,
  • Fig. 4b zeigt vergrößert den Bereich X von Fig. 4a,
  • Fig. 5 zeigt eine perspektivische Ansicht des Langspaltejektors gemäß Fig. 3,
  • Fig. 6a zeigt einen Schnitt A-A nach Fig. 1 für eine Unterdruck-Bandfördervorrichtung gemäß einem zweiten Ausführungsbeispiel,
  • Fig. 6b zeigt den Langspaltejektor 10 gemäß Fig. 6a in vergrößerter Darstellung unter Abbildung der Strömungswege,
  • Fig. 6c zeigt den Langspaltejektor 10 gemäß Fig. 6a in vergrößerter Darstellung unter Abbildung der Strömungswege in einer alternativen Ausbildung,
  • Fig. 7 zeigt einen Schnitt A-A nach Fig. 1 für eine Unterdruck-Bandfördervorrichtung gemäß einem dritten Ausführungsbeispiel,
  • Fig. 8 zeigt einen Schnitt A-A nach Fig. 1 für eine Unterdruck-Bandfördervorrichtung gemäß einem vierten Ausführungsbeispiel,
  • Fig. 9 zeigt schematisch eine Draufsicht einer Unterdruck-Bandfördervorrichtung gemäß einem fünften Ausführungsbeispiel,
  • Fig. 10 zeigt schematisch eine Draufsicht einer Unterdruck-Bandfördervorrichtung gemäß einem sechsten Ausführungsbeispiel,
  • Fig. 11 zeigt schematisch eine Draufsicht einer Unterdruck-Bandfördervorrichtung gemäß einem siebten Ausführungsbeispiel,
  • Fig. 12a zeigt einen Schnitt A-A nach Fig. 1 für eine Unterdruck-Bandfördervorrichtung gemäß einem achten Ausführungsbeispiel,
  • Fig. 12b zeigt schematisch eine Draufsicht einer Unterdruck-Bandfördervorrichtung gemäß einem neunten Ausführungsbeispiel mit Ringspaltejektoren.
The invention will be explained in more detail with reference to the embodiments illustrated in the accompanying drawings.
  • Fig. 1 shows schematically a top view of a vacuum belt conveyor device,
  • Fig. 2 shows a section AA after Fig. 1 for a vacuum belt conveyor according to a first embodiment,
  • Fig. 3 schematically shows a plan view of a long-gap ejector of the vacuum belt conveyor according to Fig. 2 .
  • Fig. 4a shows a section BB of the long-gap ejector according to Fig. 3 .
  • Fig. 4b shows enlarged the area X of Fig. 4a .
  • Fig. 5 shows a perspective view of the long-gap ejector according to Fig. 3 .
  • Fig. 6a shows a section AA after Fig. 1 for a vacuum belt conveyor according to a second embodiment,
  • Fig. 6b shows the long-gap ejector 10 according to FIG Fig. 6a in an enlarged view with a picture of the flow paths,
  • Fig. 6c shows the long-gap ejector 10 according to FIG Fig. 6a in an enlarged view with illustration of the flow paths in an alternative embodiment,
  • Fig. 7 shows a section AA after Fig. 1 for a negative pressure belt conveyor according to a third embodiment,
  • Fig. 8 shows a section AA after Fig. 1 for a negative pressure belt conveyor according to a fourth embodiment,
  • Fig. 9 schematically shows a plan view of a vacuum belt conveyor according to a fifth embodiment,
  • Fig. 10 schematically shows a plan view of a vacuum belt conveyor according to a sixth embodiment,
  • Fig. 11 schematically shows a plan view of a vacuum belt conveyor according to a seventh embodiment,
  • Fig. 12a shows a section AA after Fig. 1 for a vacuum belt conveyor according to an eighth embodiment,
  • Fig. 12b schematically shows a plan view of a vacuum belt conveyor according to a ninth embodiment with Ringpaltejektoren.

Fig, 1 zeigt eine Unterdruck-Bandfördervorrichtung 1 zum Führen einer laufenden Bahn 2, insbesondere eines Bahneinführungsstreifens einer Papier- oder Kartonbahn. Die Unterdruck-Bandfördervorrichtung 1 umfaßt Umlenkwalzen 3 und 4, zwischen denen ein Transportband 5 angeordnet ist. Das Transportband 5 ist endlos in einer Schleife 8 geführt mit einem Obertrumm 6 und einem Untertrumm 7, wie beispielsweise in Fig. 1 gezeigt. Das Transportband 5 ist luftdurchlässig und besteht dazu aus einem Tuch mit ausreichender Permeabilität oder einer Materialbahn mit Lochstruktur. Fig, 1 shows a vacuum belt conveyor 1 for guiding a moving web 2, in particular a web insertion strip of a paper or board web. The vacuum belt conveyor device 1 comprises guide rollers 3 and 4, between which a conveyor belt 5 is arranged. The conveyor belt 5 is endlessly guided in a loop 8 with a top strand 6 and a bottom strand 7, such as in Fig. 1 shown. The conveyor belt 5 is permeable to air and consists of a cloth with sufficient permeability or a material web with hole structure.

Innerhalb der Schleife 8 ist eine Vorrichtung 9 zum Aufbringen eines Unterdrucks an der Innenseite eines der Trumms des Transportbandes, hier des Obertrumms 6, zum Festhalten der Bahn 2 an dem Transportband 5 angeordnet. Die Vorrichtung 9 zum Aufbringen eines Unterdrucks wird mittels mindestens eines Ejektors 10, 11 gebildet. Der Ejektor 10, 11 kann eine eckige oder runde Bauform besitzen. Bei den Ausführungsbeispielen der Fig. 1 bis 12a ist der mindestens eine Ejektor 10, 11 als Langspaltejektor ausgebildet. Bei dem Ausführungsbeispiel gemäß Fig. 12b ist der Ejektor 10, 11 als Ringspaltejektor ausgebildet.Within the loop 8 is a device 9 for applying a negative pressure on the inside of one of the run of the conveyor belt, here the top strand 6, arranged to hold the web 2 to the conveyor belt 5. The device 9 for applying a negative pressure is formed by means of at least one ejector 10, 11. The ejector 10, 11 may have a polygonal or round design. In the embodiments of the Fig. 1 to 12a the at least one ejector 10, 11 is designed as a long-gap ejector. In the embodiment according to Fig. 12b the ejector 10, 11 is designed as a ring gap ejector.

Gemäß Fig. 1 weist der mindestens eine Langspaltejektor 10, 11 jeweils einen Luftstrahlinjektor 12, 13 mit einer Vielzahl von Luftaustrittsdüsen 14 entlang der Eintrittsseite 15, 16 des Langspalts 17, 18 auf und ist eintrittsseitig mit Abstand unterhalb der Innenseite des zum Festhalten der Bahn vorgesehenen Trumms 6 positioniert. Über seitlich am Transportband 5 anschließende Zuführungsleitungen 21, 22 wird der Luftstrahlinjektor 12, 13 des mindestens einen Langspaltejektors 10, 11 von einer nicht dargestellten Luftquelle gespeist, um Luft in den zugehörigen Langspalt 17, 18 injizieren zu können. Die eingespeiste Luft strömt mit hoher Geschwindigkeit durch die Luftaustrittsdüsen 14, wodurch Luft an der Eintrittsseite 15 angesaugt wird, die sich in der kopfseitigen Umgebung des mindestens einen Langspaltejektors 10, 11 befindet. Auf diese Weise kann ein Unterdruck an der Innenseite des Trumms 6 aufgebracht werden, indem eine oder mehrere Luftdüsen unterhalb des Bandes 5 angebracht werden. Der Druck der zugeführten Luft ist einstellbar, wodurch Einfluss genommen werden kann auf die Saugleistung. Sind mehrere Langspaltejektoren 10, 11 in Laufrichtung hintereinander angeordnet, können diese gleiche oder unterschiedliche Luftzufuhr erhalten, um dadurch individuell einstellbare Saugleistungsprofile in Transportrichtung T zu gestalten.According to Fig. 1 the at least one long-gap ejector 10, 11 in each case has an air jet injector 12, 13 with a multiplicity of air outlet nozzles 14 along the inlet side 15, 16 of the extended gap 17, 18 and is positioned on the inlet side at a distance below the inside of the runway 6 provided for holding the web. About laterally on the conveyor belt 5 subsequent supply lines 21, 22 of the air jet injector 12, 13 of the at least one long-gap ejector 10, 11 fed by an air source, not shown, in order to inject air into the associated extended nip 17, 18 can. The fed air flows at high speed through the air outlet nozzles 14, whereby air is sucked in on the inlet side 15, which is located in the head-side environment of the at least one long-gap ejector 10, 11. In this way, a negative pressure on the inside of the run 6 can be applied by one or more air nozzles are mounted below the belt 5. The pressure of the supplied air is adjustable, which can influence the suction power. If a plurality of long-gap ejectors 10, 11 are arranged one behind the other in the running direction, they can receive the same or different air supply, in order to thereby design individually adjustable suction power profiles in the transport direction T.

Die Ausbildung des mindestens einen Langspaltejektors 10, 11 ist in den Figuren 3 bis 5 für den einen Langspaltejektor 10 im Einzelnen dargestellt. Die nachfolgenden Ausführungen gelten für alle anderen Langspaltejektoren entsprechend. Danach besitzt der Langspaltejektor 10 eine im Wesentlichen rechteckige Bauform und weist einen Luftstrahlinjektor 12 auf. Der Luftstrahlinjektor 12 wird von einem Düsenstock 19 gebildet, der in Spaltlängsrichtung angeordnet ist und eine Luftströmung in dem Spaltraum 20 des Langspalts 17 erzeugt. Der Düsenstock 19 ist gegenüber der Eintrittsseite 15 vorzugsweise versenkt angeordnet, wodurch die eintrittsseitig angesaugte Luft in den Spaltraum 20 gelenkt wird. Vorzugsweise sitzt der Luftstrahlinjektor 12 in einem konvergierenden Eintrittsbereich 23 des Langspaltejektors 10, wobei die kurzen Seitenkanten 24, 25 des Langspalts 17 vorzugsweise gerundet sind.The formation of the at least one long-gap ejector 10, 11 is in the FIGS. 3 to 5 for the one long-gap ejector 10 shown in detail. The following explanations apply to all other long-gap ejectors accordingly. Thereafter, the long-gap ejector 10 has a substantially rectangular shape and has an air jet injector 12. The air jet injector 12 is formed by a nozzle 19, which is arranged in the gap longitudinal direction and generates an air flow in the gap 20 of the extended gap 17. The nozzle assembly 19 is preferably recessed with respect to the inlet side 15, whereby the air sucked in on the inlet side is directed into the gap 20. Preferably, the air jet injector 12 is seated in a converging inlet region 23 of the long-gap ejector 10, wherein the short side edges 24, 25 of the extended-nip 17 are preferably rounded.

Der Langspalt 17 des Langspaltejektors 10 kann den Spaltraum 20 mit parallelen Flächen von der Eintrittsseite 15 bis zu einer Austrittsseite 26 begrenzen, also sich ohne eingeengten Querschnitt erstrecken (vgl. Fig. 12a, 12b). Bevorzugt ist, für einen hohen Wirkungsgrad den Spaltraum 20 mit einem eingeengten Querschnitt auszubilden. Der Eintrittsbereich 23 mit konvergierenden Seitenflächen erstreckt sich dann bis unter den Luftstrahlinjektor 12. Die Verengung im Querschnitt des Langspalts 17 fördert die Bildung einer geschlossenen Strömung und damit eine vorteilhafte Abdichtung des Luftstrahlejektors 12. Die Ansaugleistung eines Langspaltejektors 10, 11 an der Eintrittsseite 15 ist steuerbar über die eingespeiste Luftströmung und durch die Form des Langspalts 17 zwischen Eintrittsseite 15 und Austrittsseite 26. Die Länge des Langspalts 17 in Strömungsrichtung ist wählbar und eröffnet eine vorteilhafte Ableitung der Luft.The extended nip 17 of the long-gap ejector 10 can delimit the gap 20 with parallel surfaces from the inlet side 15 to an outlet side 26, that is to say extend without a narrowed cross-section (cf. Fig. 12a, 12b ). It is preferred to form the gap 20 with a narrowed cross-section for a high efficiency. The inlet region 23 with converging side surfaces then extends below the air jet injector 12. The constriction in the cross section of the extended nip 17 promotes the formation of a closed flow and thus an advantageous sealing of the Luftstrahlejektors 12. The suction of a long-gap ejector 10, 11 at the inlet side 15 is controllable via the fed air flow and by the shape of the extended gap 17 between the inlet side 15 and outlet side 26. Die Länge des Long gap 17 in the flow direction is selectable and opens up an advantageous discharge of air.

An der Austrittsseite 26 ist der Langspalt 17 vorzugsweise mit einem erweiterten Querschnittsabschnitt 40 ausgebildet, wodurch das Abströmverhalten des Langspaltejektors 10 in Bezug auf eine breite Luftaustrittsverteilung verbessert wird. Die ausströmende Luft kann durch zusätzliche oder alternative Einrichtungen weg von der Vorrichtung 1 ableitbar sein, gegebenenfalls auch durch Abluftleitungen.At the outlet side 26, the extended gap 17 is preferably formed with an enlarged cross-sectional portion 40, whereby the outflow behavior of the long-gap ejector 10 is improved with respect to a wide air outlet distribution. The outflowing air can be diverted away from the device 1 by additional or alternative means, possibly also by exhaust air ducts.

Auch bei eingeengtem Querschnitt des Langspaltes eingangs- und/oder ausgangsseitig besitzt der Langspalt 17 vorzugsweise einen Abschnitt mit parallelen Seitenflächen, der etwa 50 bis 80 % der Gesamtlänge des Langspalts 17 in Strömungsrichtung zwischen Eintrittsseite 15 und Austrittsseite 26 ausmachen kann. Der Langspalt 17 bildet insoweit einen Leitkanal für die Luftströmung mit einer wählbaren Strömungsweglänge.Even with a narrowed cross-section of the extended nip input and / or output side, the extended nip 17 preferably has a section with parallel side surfaces, which can make up about 50 to 80% of the total length of the extended nip 17 in the flow direction between inlet side 15 and outlet side 26. The extended nip 17 thus forms a guide channel for the air flow with a selectable flow path length.

Bei dem in Fig. 2 dargestellten ersten Ausführungsbeispiel einer Unterdruck-Bandfördervorrichtung umfasst die Vorrichtung 9 zum Aufbringen von Unterdruck zwei Langspaltejektoren 10, 11, die in Transportrichtung T mit Abstand hintereinander angeordnet sind. Die Anzahl der nebeneinander angeordneten Langspaltejektoren 10, 11 ist wählbar. Der Abstand von der Innenseite des Trumms 6 ist ebenfalls wählbar und richtet sich nach der Ansaugleistung. Ein Mindestabstand stellt sicher, dass ein Ansaugbereich zwar lokal, aber hinreichend flächig ist. Die Erstreckung des Langspalts 17 in Spaltlängsrichtung ist wählbar in Abhängigkeit einer Breite des Transportbandes 5, damit über die gesamte Breite des Transportbandes 5 angesaugt wird. In Transportrichtung T kann der oder die Langspaltejektoren 10, 11 an wählbaren Stellen angeordnet sein, also dort positioniert sein, wo eine Ansaugcharakteristik erwünscht ist. Der jeweilige Luftstrahlinjektor 12 mit dem zugehörigen Düsenstock 19 erstreckt sich dazu vorzugsweise quer zur Bandlaufrichtung T und erzeugt eine Luftströmung senkrecht zum Band 5. Die Langspaltejektoren 10, 11 sind hier senkrecht zum Transportband 5 arbeitend angeordnet.At the in Fig. 2 illustrated first embodiment of a vacuum belt conveyor device comprises the device 9 for applying negative pressure two long-gap ejectors 10, 11, which are arranged in the transport direction T at a distance one behind the other. The number of juxtaposed long-gap ejectors 10, 11 can be selected. The distance from the inside of Trumms 6 is also selectable and depends on the intake. A minimum distance ensures that a suction area, although local, but sufficiently flat. The extent of the extended nip 17 in the longitudinal direction of the gap can be selected as a function of a width of the conveyor belt 5, so that it is sucked over the entire width of the conveyor belt 5. In the transport direction T, the long-gap ejector (s) 10, 11 can be arranged at selectable locations, that is to say be positioned where a suction characteristic is desired. The respective For this purpose, the air jet injector 12 with the associated nozzle assembly 19 preferably extends transversely to the strip running direction T and generates an air flow perpendicular to the belt 5. The long-gap ejectors 10, 11 are arranged to operate perpendicularly to the transport belt 5.

Für eine Positionierung des mindestens einen Langspaltejektors 10, 11 ist eine Halterung 27 vorgesehen, die die Langspaltejektoren 10, 11 ortsfest in der Schleife 8 hält. Die Langspaltejektoren 10, 11 können darüber hinaus freistehend in der Schleife 8 angeordnet sein. Die Halterung 27 kann von einem Rahmengestell der Vorrichtung 1 gebildet werden, in dem auch die Umlenkwalzen 3, 4 gelagert sind.For positioning the at least one long-gap ejector 10, 11, a holder 27 is provided, which holds the long-gap ejectors 10, 11 stationary in the loop 8. The long-gap ejectors 10, 11 can furthermore be arranged freestanding in the loop 8. The holder 27 may be formed by a frame of the device 1, in which the guide rollers 3, 4 are mounted.

Das Transportband 5 wird in Transportrichtung T durch mindestens eine angetriebene Umlenkwalze 3, 4 bewegt. Gemäß Fig. 2 ist hierzu für die Umlenkwalze 3 ein Antriebsmotor 28 vorgesehen. Zur Stützung des Transportbandes 5 auf der Schleife zwischen den Umlenkwalzen 3, 4 können nicht dargestellte Stützgitter vorgesehen sein.The conveyor belt 5 is moved in the transport direction T by at least one driven deflection roller 3, 4. According to Fig. 2 For this purpose, a drive motor 28 is provided for the deflection roller 3. To support the conveyor belt 5 on the loop between the guide rollers 3, 4 support grid, not shown, may be provided.

Ferner ist mindestens ein Bypass 41, 42 vom Außenraum zur Eintrittsseite 15, 16 am Ejektor integriert, der hier als Langspaltejektor 10, 11 ausgebildet ist. Der mindestens eine Bypass 41, 42 ist in eine Wandung 43, 44 des Langspaltejektors 10, 11 gelegt und erstreckt sich vorzugsweise von einem Seitenbereich der Wandung 43, 44 innerhalb einer der Eintrittsseite 15, 16 abgewandten Hälfte des Spalts 17, 18 hin zur Eintrittsseite 15, 16. Aus einem Außenraum mit höherem Druck kann dann Luft zur Eintrittsseite 15 strömen, wo ein einstellbarer Unterdruck aufgebracht wird. Der mindestens eine Bypass 41, 42 weist vorzugsweise eine Reguliereinrichtung 45 für eine selbstregelnde Einstellung einer Druckdifferenz auf. Die Reguliereinrichtung 45 ist hier eine federbelastete Klappe, die den Bypass 41, 42 einstellbar öffnet, wenn an der Eintrittsseite 15 ein bestimmtes Unterdruckniveau unterschritten wird. Der mindestens eine Bypass 41, 42 ist vorzugsweise schlitzförmig und endet an der Eintrittsseite 15, 16 vorzugsweise in Transportrichtung T vor und/oder hinter dem Spalt 17, 18 der Langspaltejektoren 10, 11. Fig. 2 zeigt die Reguliereinrichtung 45 geschlossen, d.h. der Bypass 41, 42 ist inaktiviert. Die Reguliereinrichtung 45 kann alternativ auch von einer Drossel oder einem Ventil gebildet werden.Furthermore, at least one bypass 41, 42 is integrated from the outer space to the inlet side 15, 16 on the ejector, which is designed here as a long-gap ejector 10, 11. The at least one bypass 41, 42 is placed in a wall 43, 44 of the long-gap ejector 10, 11 and preferably extends from a side region of the wall 43, 44 within a half of the gap 17, 18 facing away from the inlet side 15, 16 toward the inlet side 15 16. From an outside space with higher pressure then air can flow to the inlet side 15, where an adjustable negative pressure is applied. The at least one bypass 41, 42 preferably has a regulating device 45 for a self-adjusting adjustment of a pressure difference. The regulating device 45 here is a spring-loaded flap which opens the bypass 41, 42 in an adjustable manner when a certain level of negative pressure is reached at the inlet side 15. The at least one bypass 41, 42 is preferably slot-shaped and terminates at the inlet side 15, 16 preferably in the transport direction T in front of and / or behind the gap 17, 18 of the long-gap ejectors 10, 11. Fig. 2 shows the regulator 45 closed, ie the bypass 41, 42 is inactivated. The regulator 45 may alternatively be formed by a throttle or a valve.

Gemäß einem in Fig. 6a dargestellten zweiten Ausführungsbeispiel der Unterdruck-Bandfördervorrichtung ist innerhalb der Schleife 8 eine Trennwand 29 angeordnet. Die Trennwand 29 trennt einen Ansaugraum 33, 34, in dem die Eintrittsseite 15 des mindestens einen Langspaltejektors 10, 11 mit seinem jeweiligen Einlass angeordnet ist, von einem Abströmraum 35, 36, in dem die Austrittsseite 26 des mindestens einen Langspaltejektors 10, 11 mit seinem jeweiligen Auslass angeordnet ist. Die Trennwand 29 erstreckt sich dazu vorzugsweise im Wesentlichen parallel zum Transportband 5. Der Ansaugraum 33, 34 bildet vorzugsweise eine obere Kammer und der Abströmraum 35, 36 eine untere Kammer, die seitlich begrenzt sind durch Abdeckbleche 31, 32 gegenüber den Umlenkwalzen 3, 4.According to a in Fig. 6a illustrated second embodiment of the vacuum belt conveyor device, a partition wall 29 is disposed within the loop 8. The partition wall 29 separates an intake space 33, 34, in which the inlet side 15 of the at least one long-gap ejector 10, 11 is arranged with its respective inlet, from an outflow space 35, 36, in which the outlet side 26 of the at least one long-gap ejector 10, 11 with its respective outlet is arranged. The partition wall 29 preferably extends substantially parallel to the conveyor belt 5. The suction chamber 33, 34 preferably forms an upper chamber and the outflow space 35, 36 a lower chamber, which are bounded laterally by cover plates 31, 32 with respect to the guide rollers 3, 4th

Der Ansaugraum 33, 34 wird nach oben begrenzt durch den Trumm 6 des luftdurchlässigen Transportbands 5. Alternativ kann die Begrenzung nach oben durch ein Lochblech erfolgen, auf dem der Trumm 6 geführt läuft. Die Verteilung als auch die Öffnungsweiten der Löcher erlauben eine Einflussnahme auf die Unterdruckcharakteristik an der Innenseite des Trumms 6. Der Abströmraum 35, 36 wird nach unten begrenzt durch den rücklaufenden Trumm 7. Sind mehrere Langspaltejektoren 10, 11 angeordnet, beispielsweise zwei wie in Fig. 6 dargestellt, werden den Langspaltejektoren 10, 11 ein Ansaugraum 33, 34 und ein Abströmraum 35, 36 zugeordnet. Mittels einer Quertrennwand 30 ist die Unterteilung der Ansaugräume 33, 34 und Abströmräume 35, 36 möglich. Der mindestens eine Langspaltejektor 10, 11 saugt aus dem jeweiligen Ansaugraum 33, 34 die Luft an, wodurch ein Ansaugfeld entsprechend des Ansaugraumes 33, 34 an der Innenseite des Trumms 6 aufgebracht wird. Der Abstand der Eintrittsseite 15 des mindestens einen Langspaltejektors 10, 11 von der Innenseite des Trumms 6 kann größer gewählt werden als bei dem freistehenden Langspaltejektor 10, 11 gemäß Fig. 2. Um die Luft aus dem jeweiligen Ansaugraum 33, 34 möglichst gleichmäßig anzusaugen, wird die Eintrittsseite 15 vorzugsweise in einem mittleren Bereich des Ansaugraumes 33, 34 positioniert.The suction chamber 33, 34 is bounded at the top by the run 6 of the air-permeable conveyor belt 5. Alternatively, the limitation can be made upward through a perforated plate on which the run 6 runs out. The distribution as well as the opening widths of the holes allow an influence on the negative pressure characteristic on the inside of the run 6. The outflow space 35, 36 is bounded below by the returning Trumm 7. Are several long-gap ejectors 10, 11 arranged, for example two as in Fig. 6 2, an intake space 33, 34 and an outflow space 35, 36 are assigned to the long-gap ejectors 10, 11. By means of a transverse partition wall 30, the subdivision of the suction chambers 33, 34 and outflow spaces 35, 36 is possible. The at least one long-gap ejector 10, 11 sucks in the air from the respective intake space 33, 34, whereby an intake field corresponding to the intake space 33, 34 is applied to the inside of the run 6. The distance of the inlet side 15 of the at least one long-gap ejector 10, 11 from the inside of the run 6 can be selected to be greater than in the free-standing long-gap ejector 10, 11 according to Fig. 2 , In order to suck in the air from the respective suction space 33, 34 as uniformly as possible, the inlet side 15 is preferably positioned in a middle region of the suction space 33, 34.

Die Arbeitsweise des mindestens einen Bypasses 41, 42, der in der Darstellung der Fig. 6a aktiviert ist, ist in Fig. 6b im Einzelnen gezeigt. Die Reguliereinrichtung in Form einer Klappe 45 ist gegen die Vorspannung einer Feder 46 geschwenkt, wodurch der Bypass 41, 42 geöffnet ist. Luft aus dem Außenraum, hier dem Abströmraum 35, strömt durch den Bypass 41, 42 zur Eintrittsseite 15, 16 und dem Ansaugraum 33. Die Klappe 45 öffnet, wenn die Druckdifferenz zwischen dem Außenraum, hier dem Abströmraum 35, und der Eintrittsseite 15, 16 der Langspaltejektoren 10, 11 einen einstellbaren Wert überschreitet, so dass der Bypass 41, 42 seine Ausgleichsfunktion ausübt. Ab einem bestimmten Unterdruckwert baut sich folglich kein weiterer Unterdruck mehr auf, da nun die Bypassströmung der Absaugströmung entspricht, wie dies die eingezeichneten Strömungspfeile verdeutlichen.The operation of the at least one bypass 41, 42, in the representation of Fig. 6a is activated is in Fig. 6b shown in detail. The regulating device in the form of a flap 45 is pivoted against the bias of a spring 46, whereby the bypass 41, 42 is opened. Air from the outer space, in this case the outflow space 35, flows through the bypass 41, 42 to the inlet side 15, 16 and the suction space 33. The flap 45 opens when the pressure difference between the outer space, here the outflow space 35, and the inlet side 15, 16 the long-gap ejectors 10, 11 exceeds an adjustable value, so that the bypass 41, 42 exercises its balancing function. As a result, no further negative pressure builds up from a certain negative pressure value, since the bypass flow now corresponds to the suction flow, as illustrated by the flow arrows shown.

Fig. 6c zeigt eine alternative Ausbildung des Bypasses 41, 42. Der Bypass 41, 42 ist hier in einen Einsatz 48 für den Langspaltejektor 10, 11 gelegt. Die Reguliereinrichtung ist eine Klappe 45, die an einem widerstandsbelegten Gelenk 47 befestigt ist. Durch die Anlenkung der Klappe 45 in einem Unterdruckbereich, z.B. dem Ansaugraum 33, öffnet die Klappe 45 nach außen und nicht in den Bypass 41, 42. Die Wirkungsweise entspricht im Übrigen der zu Fig. 6b beschriebenen Wirkungsweise. Fig. 6c shows an alternative embodiment of the bypass 41, 42. The bypass 41, 42 is placed here in an insert 48 for the long-gap ejector 10, 11. The regulating device is a flap 45, which is fastened to a resistance-compensated joint 47. By the articulation of the flap 45 in a negative pressure region, for example, the suction chamber 33, the flap 45 opens to the outside and not in the bypass 41, 42. The effect corresponds to the way to Fig. 6b described mode of action.

Eine Schlitzform des Bypasses 41, 42 sorgt während des Ausgleichs dafür, dass sich beispielsweise in Querrichtung zum Transportband 5 immer eine gleichmäßige Druckverteilung ausbildet. Das System ist selbstregelnd, weil der Bypass 41, 42 bewirkt, dass sich die Strömungsverhältnisse im Bypass 41, 42 den Druckverhältnissen über dem Bypass 41, 42 anpassen können. Im Übrigen gelten die vorstehenden Ausführungen zum ersten Ausführungsbeispiel der Unterdruck-Bandfördervorrichtung 1 hier entsprechend.A slot shape of the bypass 41, 42 ensures during the compensation that, for example, in the transverse direction to the conveyor belt 5 always forms a uniform pressure distribution. The system is self-regulating because the bypass 41, 42 causes the flow conditions in the bypass 41, 42 to adjust to the pressure ratios across the bypass 41, 42. Incidentally, the above statements on the first embodiment of the vacuum belt conveyor device 1 apply here accordingly.

Gemäß einem in Fig. 7 dargestellten dritten Ausführungsbeispiel der Unterdruck-Bandfördervorrichtung 1 ist in der Trennwand 29 eine einstellbare Drossel 37, 38 angeordnet. Über die Drossel 37, 38 kann eine Durchflussmenge zwischen einem Ansaugraum 33, 34 und einem Abströmraum 35, 36 bestimmt und damit ein maximales Unterdruckniveau in einem Ansaugraum 33, 34 eingestellt werden. Ein Maximalunterdruck in dem Ansaugraum 33, 34 kann über einen solchen Bypass zwischen Ansaugraum 33, 34 und Abströmraum 35, 36 festgelegt werden. Ab einem bestimmten Unterdruckwert baut sich kein weiterer Unterdruck mehr auf, da dann die Bypassströmung über die Drossel 37, 38 der Absaugströmung entspricht. Eine bestimmte Druckdifferenz wird eingeregelt. Das Unterdruckniveau ist zudem einstellbar. Die Gefahr, dass insbesondere nassere Papier- oder Kartonbahnen am Transportband 5 durch ein zu starkes Ansaugen beschädigt werden, besteht deshalb nicht. Jedem Ansaugraum 33, 34 mit zugehörigem Abströmraum 35, 36 ist vorzugsweise eine Drossel 37, 38 zugeordnet. Außerdem kann die Antriebsleistung des Motors 28 durch eine Begrenzung des Unterdruckniveaus klein gehalten werden.According to a in Fig. 7 illustrated third embodiment of the vacuum belt conveyor 1, an adjustable throttle 37, 38 is arranged in the partition wall 29. About the throttle 37, 38 can flow between a Intake space 33, 34 and an outflow space 35, 36 determines and thus a maximum vacuum level in a suction chamber 33, 34 are set. A maximum negative pressure in the suction space 33, 34 can be defined via such a bypass between intake space 33, 34 and outflow space 35, 36. From a certain negative pressure value, no further negative pressure builds up, since then the bypass flow via the throttle 37, 38 corresponds to the suction flow. A certain pressure difference is adjusted. The vacuum level is also adjustable. The risk that especially wet paper or board webs are damaged on the conveyor belt 5 by over-suction, therefore, does not exist. Each intake chamber 33, 34 with associated outflow space 35, 36 is preferably associated with a throttle 37, 38. In addition, the drive power of the motor 28 can be kept small by limiting the vacuum level.

Im Zusammenspiel mit dem mindestens einen Bypass 41 kann der Bypass 41 im Nahbereich ausgleichen, während die Drossel 37, 38 dies in einem Fernbereich ermöglicht. Die Langspaltejektoren 10, 11 weisen hier vorzugsweise nur einen Bypass 41 in Transportrichtung T vor dem Spalt des Ejektors 10, 11 auf. Die Drossel 37, 38 ist jeweils in Transportrichtung T hinter dem Langspaltejektor 10, 11 angeordnet. Die Kombination zweier Ausgleichsfunktionen optimiert die gleichmäßige Druckverteilung für das Halten und Führen der Papier- und Kartonbahn je nach Feuchtegehalt. Im Übrigen gelten die vorstehenden Ausführungen zu dem ersten und zweiten Ausführungsbeispiel entsprechend.In conjunction with the at least one bypass 41, the bypass 41 in the vicinity compensate, while the throttle 37, 38 allows this in a long-range. The long-gap ejectors 10, 11 here preferably have only one bypass 41 in the transport direction T in front of the gap of the ejector 10, 11. The throttle 37, 38 is in each case arranged in the transport direction T behind the long-gap ejector 10, 11. The combination of two compensation functions optimizes the even pressure distribution for holding and guiding the paper and board web depending on the moisture content. Incidentally, the above statements apply to the first and second embodiments accordingly.

Das in Fig. 8 dargestellte vierte Ausführungsbeispiel der Unterdruck-Bandfördervorrichtung 1 unterscheidet sich von dem in Fig. 7 dargestellten dritten Ausführungsbeispiel dadurch, dass der mindestens eine Langspaltejektor 10, 11 nicht senkrecht zum Transportband 5 arbeitend angeordnet ist, sondern in einem Winkel zum Transportband arbeitend angeordnet ist. Die Langspaltejektoren 10, 11 stehen geneigt bzw. gekippt zur Transportebene des Transportbandes 5. Die Ansaugung ist der Abströmung gegenüber der Transportrichtung T voreilend oder nacheilend ausbildbar. Im Übrigen gelten die vorstehenden Ausführungen zu den anderen Ausführungsbeispielen hier entsprechend.This in Fig. 8 illustrated fourth embodiment of the vacuum belt conveyor device 1 differs from the in Fig. 7 illustrated third embodiment in that the at least one long-gap ejector 10, 11 is not arranged perpendicular to the conveyor belt 5 working, but is arranged working at an angle to the conveyor belt. The long-gap ejectors 10, 11 are inclined or tilted to the transport plane of the conveyor belt 5. The suction is the outflow with respect to the transport direction T leading or trailing formable. Incidentally, the above statements on the other embodiments apply here accordingly.

Die in den Fig. 9 bis 11 dargestellten Ausführungsbeispiele der Unterdruck-Bandfördervorrichtung 1 betreffen unterschiedliche Anordnungen von mindestens zwei Langspaltejektoren 10, 11 in Bezug auf die Laufrichtung T. Bei dem fünften Ausführungsbeispiel gemäß Fig. 9 ist ein erster Langspaltejektor 10 quer zur Laufrichtung T positioniert, während ein zweiter mit Abstand positionierter Langspaltejektor 11 schräg zur Transportrichtung T angeordnet ist. Die Reihenfolge kann auch umgekehrt sein. Bei dem sechsten Ausführungsbeispiel gemäß Fig. 10 sind beide Langspaltejektoren 10, 11 schräg zur Transportichtung T angeordnet. Der Winkel zur Transportrichtung T ist wählbar je nach Wahl des Unterdruckprofils, das dadurch erzeugt werden kann. Bei dem siebten Ausführungsbeispiel gemäß Fig. 11 sind die Langspaltejektoren 10, 11 in einer Reihe hintereinander angeordnet unter Ausbildung eines Absaugstreifens 39. Dieser Absaugstreifen 39 kann wie in Fig. 11 dargestellt einen Mittelstreifen bilden. Alternativ können ein Randstreifen oder beidseitig Randstreifen vorgesehen sein. Im Übrigen gelten die vorstehenden Ausführungen zu den Ausführungsbeispielen eins bis vier hier entsprechend.The in the Fig. 9 to 11 illustrated embodiments of the vacuum belt conveyor device 1 relate to different arrangements of at least two long-gap ejectors 10, 11 with respect to the running direction T. In the fifth embodiment according to Fig. 9 a first long-gap ejector 10 is positioned transversely to the direction of travel T, while a second spaced-apart long-gap ejector 11 is arranged obliquely to the transport direction T. The order can also be reversed. In the sixth embodiment according to Fig. 10 Both long-gap ejectors 10, 11 are arranged obliquely to the transport direction T. The angle to the transport direction T is selectable depending on the choice of the vacuum profile that can be generated thereby. According to the seventh embodiment according to Fig. 11 the long-gap ejectors 10, 11 are arranged in a row one behind the other to form a suction strip 39. This suction strip 39 can, as in FIG Fig. 11 represented form a median strip. Alternatively, an edge strip or edge strips on both sides may be provided. Incidentally, the above statements apply to the embodiments one to four here accordingly.

Die Fig. 12a zeigt ein achtes Ausführungsbeispiel der Unterdruck-Bandfördervorrichtung 1, das sich von den vorstehenden Ausführungen dadurch unterscheidet, dass der Langspalt 17, 18 keine Querschnittsverengung aufweist, also parallele Seitenwände aufweist. Der Wirkungsgrad ist geringer, so dass der Langspaltejektor 10, 11 vorzugsweise näher an der Innenseite des Trumms 6 des Transportbandes 5 angeordnet ist. Im Übrigen gelten für das achte Ausführungsbeispiel gemäß Fig. 12a die Ausführungen zum ersten Ausführungsbeispiel gemäß Fig. 2 entsprechend.The Fig. 12a shows an eighth embodiment of the vacuum belt conveyor device 1, which differs from the above embodiments in that the extended nip 17, 18 has no cross-sectional constriction, that has parallel side walls. The efficiency is lower, so that the long-gap ejector 10, 11 is preferably arranged closer to the inside of the run 6 of the conveyor belt 5. Incidentally, for the eighth embodiment according to Fig. 12a the comments on the first embodiment according to Fig. 2 corresponding.

Die Fig. 12b zeigt ein neuntes Ausführungsbeispiel der Unterdruck-Bandfördervorrichtung 1, das sich von dem ersten Ausführungsbeispiel gemäß Fig. 1 und 2 dadurch unterscheidet, dass die Ejektoren 10, 11 Ringspaltejektoren sind. Im Übrigen gelten die vorstehenden Ausführungen entsprechend. Insbesondere können die Langspaltejektoren der Ausführungsbeispiele zwei bis acht auch durch Ringspaltejektoren ersetzt werden.The Fig. 12b shows a ninth embodiment of the vacuum belt conveyor device 1, which differs from the first embodiment according to Fig. 1 and 2 characterized in that the ejectors 10, 11 are annular gap ejectors. For the rest, the above statements apply accordingly. In particular, the long-gap ejectors of the exemplary embodiments two to eight can also be replaced by ring-gap ejectors.

Gemäß einem weiteren nicht dargestellten Ausführungsbeispiel kann die Unterdruck-Bandfördervorrichtung 1 auch um 180° gedreht arbeiten, d.h. der Unterdruck an dem rücklaufenden Trumm unter entsprechender Drehung der Ejektoren und Umkehrung der Transportrichtung aufgebracht werden.According to another embodiment, not shown, the vacuum belt conveyor device 1 can also operate rotated through 180 °, i. the negative pressure at the returning Trumm be applied with appropriate rotation of the ejectors and reversing the transport direction.

Claims (32)

  1. Vacuum belt conveying device for guiding a moving web (2), in particular a web threading strip of a paper or board web, having an air-permeable transport belt (5) guided endlessly in a loop (8) with an upper run (6) and a lower run (7), and a device (9) arranged within the loop (8) for applying a vacuum to the inner side of one of the runs (6) of the transport belt (5) in order to hold the web (2) firmly on the transport belt (5), characterized in that the device (9) for applying a vacuum is formed by means of at least one ejector (10, 11), which in each case has an air jet injector (12) having a large number of air outlet nozzles (14) along the inlet side (15, 16) of the gap (17, 18) of the ejector (10, 11) as well as, on the inlet side, is positioned at a distance under the inner side of the run (6) which is provided to hold the web (2) firmly, and at least one bypass (41, 42) is integrated from the outer chamber to the inlet side (15, 16) of the ejector (10, 11).
  2. Vacuum belt conveying device according to Claim 1, characterized in that the at least one bypass (41, 42) is integrated into a wall (43, 44) of the gap (17, 18).
  3. Vacuum belt conveying device according to Claim 1, characterized in that the at least one bypass (41, 42) is integrated into an insert (48) for the at least one ejector (10, 11).
  4. Vacuum belt conveying device according to one of Claims 1 to 3, characterized in that the at least one bypass (41, 42) is positioned before the gap (17, 18) in the transport direction (T) of the transport belt (5).
  5. Vacuum belt conveying device according to one of Claims 1 to 4, characterized in that in each case a bypass (41, 42) is integrated into the wall (43, 44) before and after the gap (17, 18) in the transport direction (T) of the transport belt (5).
  6. Vacuum belt conveying device according to one of Claims 1 to 5, characterized in that the bypass (41, 42) can be supplied with air via a regulating device.
  7. Vacuum belt conveying device according to Claim 6, characterized in that the regulating device is a throttle, a flap or a valve.
  8. Vacuum belt conveying device according to one of Claims 1 to 7, characterized in that the at least one bypass (41, 42) extends from a side region of the wall (43, 44) inside a half of the gap (17, 18) facing away from the inlet side (15, 16) as far as the inlet side (15, 16).
  9. Vacuum belt conveying device according to one of Claims 1 to 8, characterized in that the ejector is an annular gap ejector.
  10. Vacuum belt conveying device according to one of Claims 1 to 8, characterized in that the ejector is a long-gap ejector.
  11. Vacuum belt conveying device according to Claim 10, characterized in that the at least one long-gap ejector (10, 11) produces a flow in a gap space (17, 18) via a nozzle stock (19) arranged in the gap longitudinal direction.
  12. Vacuum belt conveying device according to one of Claims 1 to 11, characterized in that a gap space (20) is formed with a narrowed cross section.
  13. Vacuum belt conveying device according to one of Claims 1 to 12, characterized in that within the loop (8) there is arranged a dividing wall (29), which divides a suction chamber (33, 34), in which the inlet side (15, 16) of the at least one ejector (10, 11) is arranged, from an outward flow chamber (35, 36), in which an outlet side, (26) of the at least one ejector (10, 11) is arranged.
  14. Vacuum belt conveying device according to Claim 13, characterized in that the suction chamber (33, 34) and outward flow chamber (35, 36) have transverse walls (30) between adjacent ejectors (10, 11).
  15. Vacuum belt conveying device according to Claim 13 or 14, characterized in that the outer chamber, from which the at least one bypass (41, 42) extends to the inlet side (15, 16), is formed by the outward flow chamber (35, 36).
  16. Vacuum belt conveying device according to one of Claims 13 to 15, characterized in that the suction chamber (33, 34) can be connected to the outward flow chamber (35, 36) in order to control a flow rate via at least one restrictor (37, 38) in the dividing wall (29).
  17. Vacuum belt conveying device according to one of Claims 1 to 16, characterized in that the at least one ejector (10, 11) is arranged to operate at right angles to the transport belt (5).
  18. Vacuum belt conveying device according to one of Claims 1 to 17, characterized in that the at least one ejector (10, 11) is arranged to operate at an angle to the transport belt (5).
  19. Vacuum belt conveying device according to one of Claims 1 to 18, characterized in that the at least one ejector (10, 11) in each case has a gap space (20) which has an outlet portion (40) with a widened cross section.
  20. Vacuum belt conveying device according to one of Claims 1 to 19, characterized in that the at least one ejector (10, 11) in each case has a gap space (20) with a selectable flow path length.
  21. Vacuum belt conveying device according to Claim 20, characterized in that the flow path length of the gap space (20) having a narrowed cross section is 50 to 80% of the total flow path length of the gap space (20).
  22. Vacuum belt conveying device according to one of Claims 1 to 21, characterized in that the air jet injector (12) is arranged in a converging inlet region (23) of a long-gap ejector (10, 11).
  23. Vacuum belt conveying device according to one of Claims 1 to 22, characterized in that at least one long-gap ejector (10, 11) is arranged transversely with respect to the running direction of the transport belt (5).
  24. Vacuum belt conveying device according to one of Claims 1 to 23, characterized in that at least one long-gap ejector (10, 11) is arranged obliquely with respect to the running direction (T) of the transport belt (5).
  25. Vacuum belt conveying device according to one of Claims 1 to 24, characterized in that a plurality of ejectors (10, 11) are arranged adjacent to one another in the running direction (T) of the transport belt (5).
  26. Vacuum belt conveying device according to one of Claims 1 to 25, characterized in that, depending on the running length of the transport belt (5), at least two ejectors (10, 11) are arranged at a distance from each other in the running direction (T) of the transport belt (5).
  27. Vacuum belt conveying device according to Claim 25 or 26, characterized in that long-gap ejectors (10, 11) are arranged with the gap longitudinal direction in the running direction (T) of the transport belt (5), forming at least one vacuum strip (39).
  28. Vacuum belt conveying device according to one of Claims 1 to 27, characterized in that the at least one ejector (10, 11) has an inlet region with rounded short side edges (24).
  29. Vacuum belt conveying device according to one of Claims 1 to 28, characterized in that the at least one air jet injector (10, 11) can be fed via feed lines (21, 22) arranged laterally on the transport belt (5).
  30. Vacuum belt conveying device according to one of Claims 1 to 29, characterized in that an outward flow chamber (35, 36) can be encapsulated for controllable dissipation of the air flowing out.
  31. Vacuum belt conveying device according to one of Claims 1 to 30, characterized in that air can be supplied to the at least one ejector (10, 11) via a feed line (21, 22), and the pressure of the air can be adjusted.
  32. Vacuum belt conveying device according to Claim 31, characterized in that a plurality of ejectors (10, 11) are arranged adjacent to one another, and air can be supplied to the feed lines (21, 22) at a respectively adjustable pressure.
EP06024086A 2005-11-30 2006-11-21 Vacuum belt feeding apparatus for guiding a moving web Not-in-force EP1792861B1 (en)

Applications Claiming Priority (1)

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DE102005057427A DE102005057427A1 (en) 2005-11-30 2005-11-30 Conveyor for a traveling web comprises an air-permeable endless belt and ejectors for applying a vacuum to the upper strand of the belt to hold the web on the belt

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EP1792861A2 EP1792861A2 (en) 2007-06-06
EP1792861A3 EP1792861A3 (en) 2009-02-18
EP1792861B1 true EP1792861B1 (en) 2010-08-18

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AT (1) ATE478026T1 (en)
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EP1792861A2 (en) 2007-06-06
ATE478026T1 (en) 2010-09-15
DE102005057427A1 (en) 2007-05-31
EP1792861A3 (en) 2009-02-18
DE502006007677D1 (en) 2010-09-30

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