EP1753909B1 - Cleaning mehtod - Google Patents

Cleaning mehtod Download PDF

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Publication number
EP1753909B1
EP1753909B1 EP05740038A EP05740038A EP1753909B1 EP 1753909 B1 EP1753909 B1 EP 1753909B1 EP 05740038 A EP05740038 A EP 05740038A EP 05740038 A EP05740038 A EP 05740038A EP 1753909 B1 EP1753909 B1 EP 1753909B1
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EP
European Patent Office
Prior art keywords
cleaning
suction
transport belt
medium
suction opening
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EP05740038A
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German (de)
French (fr)
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EP1753909A1 (en
Inventor
Hartmut Schneider
Karl-Heinz Straub
Denis Miklau
Guenther Prinz
Alexander Studentschnig
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Voith Patent GmbH
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Voith Patent GmbH
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Publication of EP1753909A1 publication Critical patent/EP1753909A1/en
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Publication of EP1753909B1 publication Critical patent/EP1753909B1/en
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/32—Washing wire-cloths or felts

Definitions

  • the invention relates to a method for cleaning a conveyor belt of a web-processing machine, in particular a machine for the production or further processing of paper, cardboard or tissue.
  • a plurality of conveyor belts are used to transport a fibrous web to be produced.
  • the conveyor belts are used here, for example, in the form of forming fabrics in the forming section, in the form of press felts in the press section and in the form of dryer fabrics in the dryer section or as transfer belts.
  • the screens and felts are at least partially designed as fabric tapes with open pore structure.
  • the conveyor belts are increasingly contaminated by, for example, in the fiber suspension containing contaminants such as adhesives or other additives.
  • contaminants such as adhesives or other additives.
  • the pores and meshes settle with the o.g. Substances too.
  • the cleaning nozzles are inclined to the transport path, wherein the direction of inclination of the nozzles changes continuously between inclination in the direction of travel of the transport path and inclination against the direction of the transport path due to the rotation of the nozzles. According to this document is thrown back from the conveyor belt cleaning medium led away via a suction channel, which is arranged parallel to the axis of rotation of the cleaning nozzles.
  • the US 6,254,730 B1 discloses a moving belt cleaning device having rotating nozzles that are adjustable in their angle of impact.
  • the cleaning of a papermaking belt is described.
  • For cleaning serves a pressurized water flow.
  • the beam angle is adjustable with respect to the belt or screen.
  • the preamble is a method for cleaning a preferably moving. Conveyor belt of a web-processing machine.
  • the method works with at least one cleaning nozzle through which the moving conveyor belt is subjected to a cleaning medium.
  • the at least one cleaning nozzle is arranged such that the cleaning medium is jet-shaped always inclined towards the direction of the conveyor belt and at an angle of incidence ⁇ of greater than 5 ° and less than 85 ° at a cleaning point on the conveyor belt.
  • the conveyor belt to be cleaned moves under the cleaning station. Characterized in that the cleaning medium is sprayed as a jet always inclined towards the direction of the conveyor belt and at an angle of incidence ⁇ between 5 ° and 85 ° on the conveyor belt, the relative speed between the conveyor belt to be cleaned and the cleaning medium is increased. Due to the speed increase, the momentum between the cleaning medium and contamination on the conveyor belt is increased, which significantly improves the cleaning performance.
  • the cleaning medium is braked after the impact on the surface of the conveyor belt.
  • One part of the cleaning medium typically 30% of the cleaning medium applied, passes through the conveyor belt (in the case of a porous structure), another part remains in the conveyor belt (5%) and another part is thrown back by the conveyor belt.
  • the reflected part is at oblique angle of incidence ⁇ between 5 ° and 85 ° for the most part (more than 50%) as a fanned beam, depending on the angle of incidence ⁇ , the structure of the conveyor belt, the machine speed and the pressure of the exiting cleaning medium at a mean angle ⁇ between 5 ° and 75 °, preferably between 15 ° ⁇ 10 ° reflected against the direction of the conveyor belt.
  • the reflected jet entrains air, cleaning medium mist and dissolved impurities, whereby a suction effect is achieved in the direction of the reflected beam.
  • the jet of the cleaning medium "scoops" or “scoops” off the dirt from the surface of the transport path to be cleaned, by undermining and lifting off the dirt particles due to the oblique impact.
  • angle of incidence ⁇ is preferably between 15 ° and 75 °, more preferably between 30 ° and 60 °.
  • the at least one cleaning nozzle is fixed, in particular not rotatable.
  • the execution of the cleaning device according to the invention is considerably simplified. This leads, on the one hand, to a simpler structure, as it is possible to dispense with a complicated movement mechanism, as a result of which the cleaning device can be manufactured more cost-effectively.
  • the maintenance and the susceptibility is thereby significantly reduced, especially since the area in which the cleaning nozzle is arranged has a very strong tendency to fouling.
  • the cleaning device usually for removing the thrown back from the conveyor belt and mixed with dirt cleaning medium to a suction channel with suction opening, in which at least partially directly enters the thrown back cleaning medium.
  • the suction opening extends at least partially in the direction of the cleaning point pointing to the side opposite in relation to the cleaning point of the cleaning nozzle is arranged, wherein the central axis of the suction channel in the region of the suction opening with the conveyor belt forms an angle ⁇ between 5 ° and 75 °.
  • the suction opening points in the direction of the reflected beam, ie the suction opening faces the reflected beam.
  • the Cleaning medium which is reflected by the cleaning point against the direction of the conveyor belt can also be easily sucked, as the suction extends at least partially in the half-space of the reflected cleaning medium and that facing. Since the average reflection angle ⁇ is usually in the range between 5 ° and 75 ° at the angles of incidence ⁇ given above, it is possible with the inventive arrangement of the suction opening to couple the reflected beam into the suction channel better than in the known embodiments in which the suction opening does not face the reflected beam.
  • the relative position between the suction opening and the at least one cleaning nozzle is fixed.
  • the angle ⁇ is preferably between 5 ° and 50 °, particularly preferably between 5 ° and 25 °.
  • a particularly preferred embodiment of the invention provides that the cross-sectional area of the suction opening and the distance of the suction opening to the cleaning point are matched to one another, that by the cross-sectional area of the suction opening a below the mean angle ⁇ reflected and in the opening angle range 0 of ⁇ 15 °, preferably of ⁇ 25 ° fanned beam of the cleaning medium can pass through the cross-sectional area of the suction opening.
  • the suction chamber extends to at least one cleaning nozzle or if the suction chamber surrounds the at least one cleaning nozzle.
  • the suction channel In order to guide the cleaning medium flowing in the suction channel as smoothly as possible in a laminar flow through the suction channel, it makes sense if the suction channel extends at least partially straight and / or curved with a radius of curvature between 10mm to 200mm.
  • the radius may change with the angle of the swept arc.
  • the suction channel may at least in sections have a constant cross-sectional area.
  • suction channel has a cross-sectional area of 100qmm to 10000qmm, preferably from 500qmm to 3000qmm, especially from 1000qmm to 2000qmm.
  • the suction channel and / or the suction opening can also be a round or have square cross section.
  • the conveyor belt can be reliably cleaned in its entire width, it makes sense if at least two of the cleaning nozzles are spaced differently from each other. In this case, it is also advantageous if the division of the scanning steps during the transverse traversing of the cleaning device is not equal to the pitch of the distances of the cleaning nozzles.
  • the cleaning nozzles are not arranged parallel to each other. In order to increase the cleaning performance, they may be oriented such that the emerging from the cleaning nozzles jets of cleaning medium are focused on the cleaning site.
  • cleaning nozzles with a diameter between 0.1mm and 0.5mm, preferably between 0.15mm and 0.3mm.
  • the cleaning medium at the outlet from the cleaning nozzle has a pressure between 20bar and 1000bar, preferably between 200bar and 500bar.
  • the cleaning medium has a liquid and / or gaseous component.
  • a cleaning medium water is often used with or without additives.
  • the temperature of the cleaning medium is adapted to the ambient temperature. Since, depending on the location, temperatures between 20 ° C and 120 ° C, often between 50 ° C and 100 ° C prevail, a preferred embodiment of the invention provides that the cleaning medium is a temperature between 20 ° C and 120 ° C, preferred between 50 ° C and 100 ° C.
  • a preferred development of the invention provides that in the direction of the reflected / flowing in the suction channel cleaning medium after the suction opening of the suction channel has a vacuum device.
  • the vacuum device has at least one injector nozzle for injection of an injection medium.
  • a negative pressure in the manner of a water jet vacuum is created by the suction effect of the air layers accelerated with the injection medium, so that dirt particles, mist and drops of cleaning medium are entrained in the direction of the outlet opening.
  • Another advantage of the injection of the injection medium is that the suction channel is permanently flushed, whereby dirt deposits in the suction channel can be reduced or prevented.
  • the cross-section of the suction channel in the area of the at least one injector nozzle has to widen in the direction of the cleaning medium flowing in the suction channel to avoid backflow.
  • the at least one injector nozzle is arranged such that the injection medium is at least partially injected parallel to the central axis of the discharge channel.
  • the injection medium which occurs from the injector, which is arranged in the direction of flow, at the outlet pressure between 20bar and 1000bar, preferably between 200bar and 500bar have and if the injector, which from the injector located downstream in the flow direction, at the outlet has a pressure between 20bar and 40bar.
  • At least one injector nozzle has a round or oval or rectangular cross section and whose diameter is in the range between 0.1 mm and 0.5 mm, preferably between 0.15 mm and 0.3 mm.
  • the injector nozzle lying behind this preferably has a 1 mm and 2 mm, preferably 1.5 mm.
  • the injector medium may have a liquid and / or gaseous component.
  • the injector medium is heated or cooled with respect to the ambient temperature.
  • the injector medium in this case has a temperature between 30 ° C and 100 ° C, preferably between 30 ° C and 70 ° C.
  • the injector medium in this case has a temperature between 4 ° C and 50 ° C, preferably between 8 ° C and 25 ° C.
  • At least one air knife is arranged in the running direction of the conveyor belt after the at least one cleaning nozzle, through which the conveyor belt can be acted upon with compressed air, which meets at an angle ⁇ between 10 ° and 80 °, preferably between 50 ° and 70 ° in the running direction on the conveyor belt , Remains of the cleaning medium, which are located on the surface or in the conveyor belt, can be blown off and / or atomized by the air knife. Furthermore, false air inlet into the area of the cleaning nozzles can be prevented.
  • the air knife at least partially forms a plurality of individual jets, which are arranged transversely to the running direction of the conveyor belt side by side and / or that the air knife at least partially forms a slot-like transverse to the direction of the conveyor belt extending air curtain.
  • the air knife performs its tasks particularly well when the compressed air has a pressure between 1 bar and 10 bar, preferably between 4bar and 7bar.
  • the compressed air is heated to a temperature between 20 ° C and 200 ° C, preferably between 50 ° C and 200 ° C. If the compressed air, which has been heated above ambient temperature, is blown onto / into the conveyor belt, an active drying of the conveyor belt takes place.
  • the FIG. 1 shows a cleaning device 1 according to the invention for cleaning a conveyor belt 2 of a web-processing machine.
  • the cleaning device 1 has a plurality of cleaning nozzles 3 arranged in a cleaning head 18, of which only one can be seen in the present illustration. Through the cleaning nozzles 3, the conveyor belt 2 can be acted upon by a cleaning medium 4 at a cleaning point 5.
  • the cleaning nozzles 3 are arranged such that the cleaning medium 4 as a jet 7 always against the running direction 6 of the conveyor belt 2 at an angle of incidence ⁇ between 5 ° and 85 ° at the cleaning station 5 hits the conveyor belt 2.
  • the incident beam 7 with the transport path 2 includes an angle of incidence ⁇ of 45 °.
  • angle of incidence ⁇ is preferably between 15 ° and 75 °, more preferably between 30 ° and 50 °.
  • the cleaning nozzles 3 are fixed with respect to the conveyor belt 2, in particular not rotatable.
  • the device 1 for cleaning the conveyor belt 2 has a suction channel 8 with a suction opening 9.
  • the suction channel 8 has a central axis 10.
  • Through the suction opening 9 enters with dirt mixed cleaning medium 4 in the suction channel 8, after this is reflected by the conveyor belt 2.
  • a large part of the thrown back from the conveyor belt cleaning medium 4 is reflected as a fanned beam 11 at an average angle ⁇ from the conveyor belt 2 against the running direction 6 of the conveyor belt 2.
  • the suction opening 9 extends on the side which is arranged opposite the cleaning nozzle 3 with respect to the cleaning point 5. According to the invention, the suction opening 9 in the direction of the cleaning point 5 and thus in the direction of the reflected beam 11.
  • the central axis 10 of the suction channel 8 in the region of the suction opening 9 according to the invention with the conveyor belt 2 forms an angle ⁇ between 5 ° and 75 °.
  • the conveyor belt 2 in the region of the cleaning point 5 cuts.
  • the cross-sectional area 27 of the suction opening 9 and the distance A between the cross-sectional area 27 and the cleaning point 5 are matched to one another such that the cross-sectional area 27 of the suction opening 9 reflects a value below the mean angle ⁇ and ⁇ ⁇ 25 ° in the opening angle range fanned beam of the cleaning medium through the cross-sectional area 27 of the suction opening 9 can occur.
  • a suction chamber 12 is formed.
  • the suction chamber 12 extends in the present embodiment in the direction of the cleaning nozzles 3 and surrounds them.
  • the suction chamber 12 has an opening 13 which extends horizontally to the conveyor belt 2 and to the conveyor belt 2 between 1mm and 10mm, preferably between 3mm and 5mm spaced.
  • the suction channel 8 extends in the flow direction of the reflected beam 11 first curved with a radius of curvature 100mm and then extends straight through which the suction channel 8 is replaced by the shape of a "shoe".
  • the suction channel 8 has, after the suction opening 9, a vacuum device in the form of one or more injector nozzles 16 for injection of an injection medium 17.
  • a portion 14 of the suction channel 8, which extends between the suction opening 9 and the injector nozzle 16, has a constant cross-sectional area.
  • the adjoining the section 14 section 15 of the suction channel 8 extends straight.
  • the cross section of the suction channel in the region 15 widens starting from the injector nozzle 16 in the direction of the cleaning medium 4 flowing in the suction channel 8.
  • the injector nozzle 16 is arranged such that the injection medium 17 is injected at least in sections parallel to the central axis 10 of the discharge channel 8 in the region 15.
  • the suction channel and / or the suction opening may in this case have a round or quadrangular cross-section.
  • the injection medium 17 has a pressure between 20 bar and 1000 bar, preferably between 200 bar and 500 bar, on exiting the injector nozzle.
  • the injector nozzle 16 may have both a round or oval or rectangular cross-section.
  • the injector nozzle 16 has a diameter between 0.1 mm and 0.5 mm, preferably between 0.15 mm and 0.3 mm.
  • the injector medium may have a liquid and / or gaseous component and is water in the present embodiment.
  • the injector 17 is cooled with respect to the ambient temperature and has a temperature of 8 ° C.
  • an air knife 19 is arranged, through which the conveyor belt 2 can be acted upon with compressed air 20, the angle ⁇ between 10 ° and 80 °, preferably between 50 ° and 70 ° in the direction 6 on the Conveyor belt 2 hits.
  • the air knife 19 may in this case at least partially formed by a plurality of individual jets, which are arranged transversely to the running direction 6 of the conveyor belt 2 side by side and / or at least partially formed by a slot-like transverse to the running direction 6 of the conveyor belt 2 extending air curtain.
  • the compressed air has a pressure of 5bar in the present embodiment.
  • the compressed air 20 is heated above ambient temperature to a temperature of 170 ° C.
  • FIG. 2a (Section line aa in FIG. 1 ) shows the cleaning head 18 in a front view with a view of the cleaning nozzles 3, 3 ', 3 "and 3"'.
  • the cleaning nozzles 3, 3 ', 3 "and 3''' arranged side by side, wherein the cleaning head 18 is oriented such that the cleaning nozzles 3, 3 ', 3" and 3 "'
  • all the cleaning nozzles 3, 3 ', 3 "and 3'” are spaced apart from one another in a different manner (D3 ⁇ D1 ⁇ D2).
  • the cleaning nozzles 3, 3 ', 3 "and 3''' in relation to each other with respect to the vertical 28 by the angle ⁇ 1, ⁇ 2, ⁇ 3 and ⁇ 4 inclined that from the cleaning nozzles 3, 3 ', 3" and 3 '' emanating rays 7,7 ', 7 "and 7"' are focused at the cleaning site (See FIG. 2b ; Section line bb in FIG. 1 ).
  • the cleaning nozzles 3, 3 ', 3 "and 3"' have a round cross section with a diameter of 0.2 mm.
  • the cleaning medium 4 exiting from the cleaning nozzles has a pressure of 350 bar on exiting the cleaning nozzles 3, 3 ', 3 "and 3''' Water is used as the cleaning medium 4. To prevent condensation of the cleaning medium, this is above room temperature to 100 ° C heated.
  • FIG. 3 shows a view of the cleaning device 1 in combination with a papermaking machine 25.
  • the cleaning device 1 is connected to a moving unit 21, which makes it possible to move the cleaning device transversely (CD) to the running direction 6 of the transport path 2.
  • a drain line 23 is arranged, through which the cleaning medium is further led away.
  • flow accelerators 22 in the form of injector nozzles 22 are arranged.
  • the injector nozzles 22 have a nozzle diameter between 1 mm and 2 mm, preferably 1.5 mm.
  • the pressure of the injector medium exiting the injector nozzles 22 is in the range of 20bar to 40bar.
  • the system has a plurality of injector nozzles 16 and 22 arranged one behind the other in the flow direction of the cleaning medium 4 to be removed.
  • the injector medium 26 injected by the injector nozzles 22 is subjected to a lower pressure than the injector medium 17.

Landscapes

  • Cleaning In General (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Glass Compositions (AREA)
  • Cleaning Or Drying Semiconductors (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)

Abstract

The invention relates to a device (1) for cleaning a conveyor belt (2) of a web-processing machine. Said device comprises at least one cleaning nozzle (3) through which the conveyor belt (2) is impinged upon with a cleaning medium (4). The cleaning nozzle (3) is mounted in such a manner that the cleaning medium (4) hits the conveyor belt (2) in a cleaning section (5) as a jet which is always inclined against the direction of travel of the conveyor belt (2) at an angle of incidence alpha of 5 DEG to 85 DEG .

Description

Die Erfindung betrifft ein Verfahren zum Reinigen eines Transportbandes einer bahnverarbeitenden Maschine, insbesondere einer Maschine zur Herstellung oder Weiterverarbeitung von Papier, Karton oder Tissue.The invention relates to a method for cleaning a conveyor belt of a web-processing machine, in particular a machine for the production or further processing of paper, cardboard or tissue.

In einer Papiermaschine werden eine Vielzahl von Transportbändern zum Transport einer herzustellenden Faserstoffbahn eingesetzt. Die Transportbänder finden hierbei bspw. in Form von Formiersieben in der Formierpartie, in Form von Pressfilzen in der Pressenpartie und in Form von Trockensieben in der Trockenpartie oder als Transferbänder Verwendung. Oftmals sind die Siebe und Filze zumindest teilweise als Gewebebänder mit offener Porenstruktur ausgebildet.In a paper machine, a plurality of conveyor belts are used to transport a fibrous web to be produced. The conveyor belts are used here, for example, in the form of forming fabrics in the forming section, in the form of press felts in the press section and in the form of dryer fabrics in the dryer section or as transfer belts. Often the screens and felts are at least partially designed as fabric tapes with open pore structure.

Während des Betriebs der Papiermaschine werden die Transportbänder in zunehmendem Maße durch bspw. in der Fasersuspension enthaltende Verschmutzungen wie Klebstoffe oder sonstige Zuschlagstoffe verunreinigt. So setzen sich bspw. bei einem Gewebeband die Poren und Maschen mit der Zeit mit den o.g. Stoffen zu.During operation of the paper machine, the conveyor belts are increasingly contaminated by, for example, in the fiber suspension containing contaminants such as adhesives or other additives. Thus, for example, in a fabric tape, the pores and meshes settle with the o.g. Substances too.

Aus dem Stand der Technik sind mehrere Vorrichtungen und Verfahren zum Reinigen eines Transportbandes einer bahnverarbeitenden Maschine bekannt.Several devices and methods for cleaning a conveyor belt of a web-processing machine are known from the prior art.

So offenbart die EP 0 731 212 A1 eine Reinigungsvorrichtung mit rotierbaren Reinigungsdüsen. Gemäß dieser Druckschrift sind die Reinigungsdüsen gegen die Transportbahn geneigt, wobei sich durch die Rotation der Düsen die Neigungsrichtung der Düsen kontinuierlich zwischen Neigung in Laufrichtung der Transportbahn und Neigung gegen die Richtung der Transportbahn ändert. Gemäß dieser Druckschrift wird das vom Transportband zurückgeworfene Reinigungsmedium über einen Absaugkanal weggeführt, welcher parallel zur Drehachse der Reinigungsdüsen angeordnet ist.So revealed the EP 0 731 212 A1 a cleaning device with rotatable cleaning nozzles. According to this document, the cleaning nozzles are inclined to the transport path, wherein the direction of inclination of the nozzles changes continuously between inclination in the direction of travel of the transport path and inclination against the direction of the transport path due to the rotation of the nozzles. According to this document is thrown back from the conveyor belt cleaning medium led away via a suction channel, which is arranged parallel to the axis of rotation of the cleaning nozzles.

Auf folgende Druckschriften soll hingewiesen werden:The following documents should be noted:

Die US 6 254 730 B1 offenbart eine Reinigungseinrichtung für ein bewegtes Band, aufweisend rotierende Düsen, die in Ihrem Auftreffwinkel verstellbar sind.The US 6,254,730 B1 discloses a moving belt cleaning device having rotating nozzles that are adjustable in their angle of impact.

Aus der US 6 468 397 B1 ist ein Reinigungsverfahren für ein um eine Walze laufendes Sieb entnehmbar. Bei diesem Verfahren kontaktieren die Reinigungsstrahlen tangential das zu reinigende Sieb. Der Druck der Reinigungsstrahlen ist mit mindestens 50 psi, vorzugsweise 100 bis 400 psi angegeben. Umgerechnet in bar bedeutet das einen Druck zwischen 3,5 und 28 bar.From the US Pat. No. 6,468,397 B1 is a cleaning method for a running around a roller screen removed. In this method, the cleaning jets tangentially contact the screen to be cleaned. The pressure of the cleaning jets is at least 50 psi, preferably 100 to 400 psi. Converted in bar, this means a pressure between 3.5 and 28 bar.

In der GB 160 861 A ist die Reinigung eines Papiermaschinenbandes beschrieben. Zur Reinigung dient ein unter Druck stehender Wasserstrom. Der Strahlwinkel ist in Bezug auf das Band bzw. Sieb verstellbar.In the GB 160 861 A the cleaning of a papermaking belt is described. For cleaning serves a pressurized water flow. The beam angle is adjustable with respect to the belt or screen.

Es ist die Aufgabe der vorliegenden Erfindung ein Reinigungsverfahren vorzuschlagen, das eine verbesserte Reinigungsleistung beim Entfernen von Schmutz bei einem Transportband gewährleistet.It is the object of the present invention to propose a cleaning method which ensures improved cleaning performance when removing dirt in a conveyor belt.

Die Aufgabe wird durch die Merkmale des Patentanspruchs 1 gelöst. Vorteilhafte Ausführungsformen und Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben.The object is solved by the features of patent claim 1. Advantageous embodiments and further developments of the invention are specified in the subclaims.

Gemäß dem Oberbegriff handelt es sich um ein Verfahren zum Reinigen eines vorzugsweise bewegten. Transportbandes einer bahnverarbeitenden Maschine. Das Verfahren arbeitet mit zumindest einer Reinigungsdüse durch die das sich bewegende Transportband mit einem Reinigungsmedium beaufschlagt wird.According to the preamble, it is a method for cleaning a preferably moving. Conveyor belt of a web-processing machine. The method works with at least one cleaning nozzle through which the moving conveyor belt is subjected to a cleaning medium.

Erfindungsgemäß wird die zumindest eine Reinigungsdüse derart angeordnet, dass das Reinigungsmedium strahlförmig immer gegen die Laufrichtung des Transportbandes geneigt ist und unter einem Einfallswinkel α von größer 5° und kleiner 85° an einer Reinigungsstelle auf das Transportband trifft.According to the invention, the at least one cleaning nozzle is arranged such that the cleaning medium is jet-shaped always inclined towards the direction of the conveyor belt and at an angle of incidence α of greater than 5 ° and less than 85 ° at a cleaning point on the conveyor belt.

Das zu reinigende Transportband bewegt sich unter der Reinigungsstelle hindurch. Dadurch, dass das Reinigungsmedium als Strahl immer gegen die Laufrichtung des Transportbandes geneigt gespritzt wird und unter einem Einfallswinkel α zwischen 5° und 85° auf das Transportband trifft, wird die relative Geschwindigkeit zwischen dem zu reinigenden Transportband und dem Reinigungsmedium erhöht. Aufgrund der Geschwindigkeitserhöhung wird der Impuls zwischen Reinigungsmedium und Verschmutzung auf dem Transportband erhöht, wodurch die Reinigungsleistung erheblich verbessert.The conveyor belt to be cleaned moves under the cleaning station. Characterized in that the cleaning medium is sprayed as a jet always inclined towards the direction of the conveyor belt and at an angle of incidence α between 5 ° and 85 ° on the conveyor belt, the relative speed between the conveyor belt to be cleaned and the cleaning medium is increased. Due to the speed increase, the momentum between the cleaning medium and contamination on the conveyor belt is increased, which significantly improves the cleaning performance.

Das Reinigungsmedium wird nach dem Aufprall auf die Oberfläche des Transportbandes abgebremst. Ein Teil des Reinigungsmediums, typischerweise 30% des beaufschlagten Reinigungsmediums tritt durch das Transportband (bei poröser Struktur) durch, ein anderer Teil verbleibt im Transportband (5%) und ein weiterer Teil wird vom Transportband zurückgeworfen. Der zurückgeworfene Teil wird bei schrägem Einfallswinkel α zwischen 5° und 85° zum Großteil (mehr als 50%) als aufgefächerter Strahl, abhängig vom Einfallswinkel α, von der Struktur des Transportbandes, der Maschinengeschwindigkeit und dem Druck des austretenden Reinigungsmediums unter einem mittleren Winkel γ zwischen 5° und 75°, bevorzugt zwischen 15°±10° gegen die Laufrichtung des Transportbandes reflektiert. Hierbei reißt der reflektierte Strahl Luft, Reinigungsmediumnebel und gelöste Verunreinigungen mit, wodurch eine Sogwirkung in Richtung des reflektierten Strahls erreicht wird.The cleaning medium is braked after the impact on the surface of the conveyor belt. One part of the cleaning medium, typically 30% of the cleaning medium applied, passes through the conveyor belt (in the case of a porous structure), another part remains in the conveyor belt (5%) and another part is thrown back by the conveyor belt. The reflected part is at oblique angle of incidence α between 5 ° and 85 ° for the most part (more than 50%) as a fanned beam, depending on the angle of incidence α, the structure of the conveyor belt, the machine speed and the pressure of the exiting cleaning medium at a mean angle γ between 5 ° and 75 °, preferably between 15 ° ± 10 ° reflected against the direction of the conveyor belt. Here, the reflected jet entrains air, cleaning medium mist and dissolved impurities, whereby a suction effect is achieved in the direction of the reflected beam.

Des weiteren "schält" oder "löffelt" der Strahl des Reinigungsmediums den Schmutz von der Oberfläche der zu reinigenden Transportbahn ab, indem die Schmutzpartikel aufgrund des schrägen Aufpralls unterspült und abgehoben werden.Furthermore, the jet of the cleaning medium "scoops" or "scoops" off the dirt from the surface of the transport path to be cleaned, by undermining and lifting off the dirt particles due to the oblique impact.

Darüber hinaus dringt beim schrägen Aufprall ein geringerer Anteil des Reinigungsmediums in eine maschige und / oder poröse Struktur eines Transportbandes ein, als dies bei senkrechtem Einfall des Reinigungsmediums der Fall ist. Da ein Transportband im Regelfall im wesentlichen nur auf der Oberfläche verschmutzt, ist folglich auch nur die Reinigung der Oberfläche notwendig. Folglich kann bei schrägem Einfall des Reinigungsmediums das Transportband effektiver gereinigt werden, wobei weniger Reinigungsmedium ins Transportband gelangt.In addition, in the oblique impact, a smaller proportion of the cleaning medium penetrates into a mesh and / or porous structure of a conveyor belt than is the case with normal incidence of the cleaning medium. Since a conveyor belt usually soils essentially only on the surface, therefore, only the cleaning of the surface is necessary. Consequently, at an angle of incidence of the cleaning medium, the conveyor belt can be cleaned more effectively, with less cleaning medium entering the conveyor belt.

Versuche haben ergeben, dass besonders gute Reinigungsergebnisse erzielt werden, wenn der Einfallswinkel α bevorzugt zwischen 15° und 75°, besonders bevorzugt zwischen 30° und 60° ist.Experiments have shown that particularly good cleaning results are achieved when the angle of incidence α is preferably between 15 ° and 75 °, more preferably between 30 ° and 60 °.

Nach einer Weiterbildung der Erfindung ist vorgesehen, dass die zumindest eine Reinigungsdüse feststehend, insbesondere nicht rotierbar ist. Durch dieses Merkmal wird die Ausführung der erfindungsgemäßen Reinigungsvorrichtung erheblich vereinfacht. Dies führt zum einen zu einem einfacheren Aufbau, da auf eine aufwendige Bewegungsmechanik verzichtet werden kann, wodurch die Reinigungsvorrichtung kostengünstiger hergestellt werden kann. Zum anderen wird hierdurch der Wartungsaufwand und die Störanfälligkeit erheblich reduziert, insbesondere da der Bereich in dem die Reinigungsdüse angeordnet ist eine sehr starke Verschmutzungsneigung hat.According to a development of the invention, it is provided that the at least one cleaning nozzle is fixed, in particular not rotatable. By this feature, the execution of the cleaning device according to the invention is considerably simplified. This leads, on the one hand, to a simpler structure, as it is possible to dispense with a complicated movement mechanism, as a result of which the cleaning device can be manufactured more cost-effectively. On the other hand, the maintenance and the susceptibility is thereby significantly reduced, especially since the area in which the cleaning nozzle is arranged has a very strong tendency to fouling.

Da es bspw. in der Trockenpartie nachteilig ist, wenn im Transportband (Gewebe) Reinigungsmedium verbleibt, welches zur Rückbefeuchtung der wenig später mit dem umlaufenden Transportband in Kontakt kommenden Papierbahn führt, ist es beim Reinigen des Transportbandes während des Betriebs der Papiermaschine unerlässlich, das Reinigungsmedium so effektiv wie möglich vom Transportband zu entfernen. Aus diesem Grund weist die Reinigungsvorrichtung üblicherweise zum Wegführen des vom Transportband zurückgeworfen und mit Schmutz vermengten Reinigungsmediums einen Saugkanal mit Saugöffnung auf, in welche das zurückgeworfene Reinigungsmedium zumindest teilweise unmittelbar eintritt.Since it is disadvantageous, for example, in the dryer section, if cleaning medium remains in the conveyor belt (tissue), which leads to rewetting of the paper web which comes into contact with the circulating conveyor belt a little later, it is essential to clean the conveyor belt during operation of the paper machine to remove as effectively as possible from the conveyor belt. For this reason, the cleaning device usually for removing the thrown back from the conveyor belt and mixed with dirt cleaning medium to a suction channel with suction opening, in which at least partially directly enters the thrown back cleaning medium.

Um den aufgefächerten Strahl effektiv auffangen zu können, welcher unter dem mittleren Winkel γ vom Transportband gegen die Laufrichtung des Transportbandes, d.h. auf die Seite reflektiert wird, die in Bezug zur Reinigungsstelle der Reinigungsdüse gegenüberliegend angeordnet ist, sieht eine besonders bevorzugte Ausführungsform der Erfindung vor, dass sich die Saugöffnung zumindest abschnittweise in Richtung der Reinigungsstelle weisend auf der Seite erstreckt, die in Bezug zur Reinigungsstelle der Reinigungsdüse gegenüberliegend angeordnet ist, wobei die Mittelachse des Saugkanals im Bereich der Saugöffnung mit dem Transportband einen Winkel δ zwischen 5° und 75° einschließt.In order to be able to effectively absorb the fanned-out beam, which at the mean angle γ of the conveyor belt against the running direction of the conveyor belt, i. is reflected on the side, which is arranged opposite with respect to the cleaning point of the cleaning nozzle, provides a particularly preferred embodiment of the invention, that the suction opening extends at least partially in the direction of the cleaning point pointing to the side opposite in relation to the cleaning point of the cleaning nozzle is arranged, wherein the central axis of the suction channel in the region of the suction opening with the conveyor belt forms an angle δ between 5 ° and 75 °.

Die Saugöffnung gemäß dieser Ausführungsform weist in Richtung des reflektierten Strahls, d.h. die Saugöffnung ist dem reflektierten Strahl zugewandt. Das Reinigungsmedium, welches von der Reinigungsstelle gegen die Laufrichtung des Transportbandes reflektiert wird kann ferner einfacher abgesaugt werden, da sich die Ansaugöffnung zumindest abschnittsweise im Halbraum des reflektierten Reinigungsmediums und zwar diesem zugewandt erstreckt. Da der mittlere Reflexionswinkel γ bei den oben angegebenen Einfallswinkeln α üblicherweise im Bereich zwischen 5° und 75° liegt, ist es mit der erfindungsgemäßen Anordnung der Saugöffnung möglich, den reflektierten Strahl in den Saugkanal besser als bei den bekannten Ausführungsformen einzukoppeln, bei denen die Saugöffnung nicht dem reflektierten Strahl zugewandt ist.The suction opening according to this embodiment points in the direction of the reflected beam, ie the suction opening faces the reflected beam. The Cleaning medium, which is reflected by the cleaning point against the direction of the conveyor belt can also be easily sucked, as the suction extends at least partially in the half-space of the reflected cleaning medium and that facing. Since the average reflection angle γ is usually in the range between 5 ° and 75 ° at the angles of incidence α given above, it is possible with the inventive arrangement of the suction opening to couple the reflected beam into the suction channel better than in the known embodiments in which the suction opening does not face the reflected beam.

Durch die Erhöhung der Saugleistung des Saugkanals kann des weiteren die Reinigungsleistung der Reinigungsvorrichtung gesteigert werden, da aufgrund der erhöhten Saugleistung mit mehr Reinigungsmedium gearbeitet werden kann, wobei das Transportband nach erfolgter Reinigung und Absaugung genauso trocken ist wie bei bekannten Saugkanalkonfigurationen bei geringerem Einsatz von Reinigungsmedium.By increasing the suction power of the suction channel of the cleaning performance of the cleaning device can be further increased, since due to the increased suction power can be used with more cleaning medium, the conveyor belt after cleaning and suction is just as dry as in known Saugkanalkonfigurationen with less use of cleaning medium.

Bevorzugterweise ist die relative Position zwischen der Saugöffnung und der zumindest einen Reinigungsdüse fest.Preferably, the relative position between the suction opening and the at least one cleaning nozzle is fixed.

Versuche haben gezeigt, dass eine Einkopplung des aufgefächerten reflektierten Reinigungsmediums in den Saugkanal besonders gut möglich ist, wenn der Winkel δ bevorzugt zwischen 5° und 50°, besonders bevorzugt zwischen 5° und 25° ist.Experiments have shown that a coupling of the fanned-out reflected cleaning medium into the suction channel is particularly well possible if the angle δ is preferably between 5 ° and 50 °, particularly preferably between 5 ° and 25 °.

Um das reflektierte Reinigungsmedium möglichst effektiv in den Saugkanal einkoppeln zu können ist es sinnvoll, wenn der reflektierte Strahl aus Reinigungsmedium, Verunreinigungen und Luft / Luftgrenzschichten möglichst direkt, d.h. ohne oftmalige Richtungsänderung bspw. bedingt durch Wandreflexionen und dgl. in die Saugöffnung gelangen kann. Zur weiteren Verbesserung der Einkopplung des reflektierten Reinigungsmediums in die Saugöffnung und zur verlustfreieren Strömung im Saugkanal kann es deshalb sinnvoll sein, wenn sich die Mittelachse im Bereich der Saugöffnung im wesentlichen in Verlängerung des unter dem mittleren Winkel γ reflektierten Reinigungsmediums erstreckt, d.h. wenn die Mittelachse im Bereich der Saugöffnung einen möglichst kleinen parallelen Versatz zum Strahl des unter dem mittleren Reflexionswinkel γ reflektierten Reinigungsmedium hat und wenn die Mittelachse im Bereich der Saugöffnung mit dem mittleren Winkel γ einen möglichst geringen Winkel einschließt. Der parallele Versatz kann hierbei sinnvoller weise maximal so groß sein, dass der unter dem mittleren Winkel γ reflektierte Anteil des Strahls noch direkt in die Saugöffnung eintreten kann. Demzufolge sehen die folgenden besonders bevorzugten Ausführungsformen vor, dass

  • die Mittelachse des Saugkanals im Bereich der Saugöffnung mit dem mittleren Winkel γ den Winkel E im Bereich zwischen ±25°, bevorzugt zwischen ±15°, ganz besonders bevorzugt zwischen ±5° einschließt und / oder
  • die Verlängerung der Mittelachse des Saugkanals im Bereich der Saugöffnung das Transportband im Bereich der Reinigungsstelle schneidet , d.h. kein paralleler Versatz zwischen Mittelachse des Saugkanals im Bereich der Saugöffnung und dem unter dem mittleren Winkel γ reflektierten Anteil des Strahls des Reinigungsmediums.
In order to be able to couple the reflected cleaning medium as effectively as possible into the suction channel, it makes sense if the reflected jet of cleaning medium, impurities and air / air boundary layers can reach the suction opening as directly as possible, ie without frequent changes of direction, for example due to wall reflections and the like. To further improve the coupling of the reflected cleaning medium into the suction opening and the loss-free flow in the suction channel, it may therefore be useful if the central axis in Area of the suction opening extends substantially in extension of the reflected medium at the average angle γ cleaning medium, ie when the central axis in the region of the suction opening as small a parallel offset to the beam of the reflected at the average reflection angle γ cleaning medium and if the central axis in the suction opening the average angle γ includes the smallest possible angle. In this case, the parallel offset can usefully be maximally so large that the portion of the beam reflected at the mean angle γ can still enter directly into the suction opening. Accordingly, the following particularly preferred embodiments provide that
  • the central axis of the suction channel in the region of the suction opening with the mean angle γ encloses the angle E in the range between ± 25 °, preferably between ± 15 °, very particularly preferably between ± 5 ° and / or
  • the extension of the center axis of the suction channel in the region of the suction opening intersects the conveyor belt in the region of the cleaning point, ie no parallel offset between the center axis of the suction channel in the region of the suction opening and the portion of the jet of the cleaning medium which is reflected by the mean angle γ.

Des weiteren ist es sinnvoll, wenn ein möglichst großer Winkelbereich des aufgefächerten reflektierten Strahls aus Reinigungsmedium in der Saugöffnung eingefangen werden kann. Deshalb sieht eine besonders bevorzugte Ausführungsvariante der Erfindung vor, dass die Querschnittsfläche der Saugöffnung und der Abstand der Saugöffnung zur Reinigungsstelle derart aufeinander abgestimmt sind, dass durch die Querschnittsfläche der Saugöffnung ein unter dem mittleren Winkels γ reflektierter und im Öffnungswinkelbereich 0 von ± 15°, bevorzugt von ±25° aufgefächerter Strahl des Reinigungsmediums durch die Querschnittsfläche der Saugöffnung treten kann.Furthermore, it makes sense if the largest possible angular range of the fanned-out reflected beam can be captured from cleaning medium in the suction opening. Therefore, a particularly preferred embodiment of the invention provides that the cross-sectional area of the suction opening and the distance of the suction opening to the cleaning point are matched to one another, that by the cross-sectional area of the suction opening a below the mean angle γ reflected and in the opening angle range 0 of ± 15 °, preferably of ± 25 ° fanned beam of the cleaning medium can pass through the cross-sectional area of the suction opening.

Um den Anteil des Reinigungsmediums, welches bspw. in Form von Nebel nicht als aufgefächerter Strahl in Richtung des mittleren Reflexionswinkels γ reflektiert wird aufzufangen, ist es sinnvoll, wenn in Laufrichtung des Transportbandes nach der Saugöffnung ein Saugraum gebildet wird, der sich zumindest abschnittweise in Richtung der zumindest einen Reinigungsdüse erstreckt und eine Öffnung hat, die waagerecht zum Transportband verläuft.To the proportion of the cleaning medium, which, for example. In the form of fog not as fanned beam is reflected in the direction of the mean reflection angle γ, it makes sense if in the direction of the conveyor belt after the suction opening a suction chamber is formed which extends at least partially in the direction of at least one cleaning nozzle and has an opening which extends horizontally to the conveyor belt ,

Gute Saugleistungen werden erzielt, wenn die waagrechte Öffnung zum Transportband zwischen 1 mm und 10mm, bevorzugt zwischen 3mm und 5mm beabstandet ist.Good suction performance is achieved when the horizontal opening to the conveyor belt between 1 mm and 10mm, preferably between 3mm and 5mm spaced.

Um möglichst das gesamte als Nebel ausgebildete und nicht gerichtet reflektierte Reinigungsmedium absaugen zu können ist es sinnvoll, wenn sich der Saugraum bis zur zumindest einem Reinigungsdüse erstreckt oder wenn der Saugraum die zumindest eine Reinigungsdüse umgibt.In order to be able to aspirate as far as possible the entire cleaning medium formed as mist and not directionally reflected, it makes sense if the suction chamber extends to at least one cleaning nozzle or if the suction chamber surrounds the at least one cleaning nozzle.

Um das im Saugkanal strömende Reinigungsmedium möglichst reibungsfrei in laminarer Strömung durch den Saugkanal zu führen ist es sinnvoll, wenn sich der Saugkanal zumindest abschnittsweise gerade und / oder gekrümmt mit einem Krümmungsradius zwischen 10mm bis 200mm erstreckt. Hierbei kann sich der Radius mit dem Winkel des überstrichenen Bogens ändern.In order to guide the cleaning medium flowing in the suction channel as smoothly as possible in a laminar flow through the suction channel, it makes sense if the suction channel extends at least partially straight and / or curved with a radius of curvature between 10mm to 200mm. Here, the radius may change with the angle of the swept arc.

Des weiteren kann der Saugkanal zumindest abschnittweise eine konstante Querschnittsfläche aufweisen.Furthermore, the suction channel may at least in sections have a constant cross-sectional area.

Versuche haben gezeigt, dass besonders gute Saugleistungen bei geringem Grad zur Verschmutzung des Saugkanals erzielt werden, wenn der Saugkanal eine Querschnittsfläche von 100qmm bis 10000qmm, bevorzugt von 500qmm bis 3000qmm, besonders von 1000qmm bis 2000qmm hat.Experiments have shown that particularly good suction at a low degree to the contamination of the suction channel can be achieved if the suction channel has a cross-sectional area of 100qmm to 10000qmm, preferably from 500qmm to 3000qmm, especially from 1000qmm to 2000qmm.

Der Saugkanal und / oder die Saugöffnung können des weiteren einen runden oder viereckigen Querschnitt haben.The suction channel and / or the suction opening can also be a round or have square cross section.

Um das Transportband gleichzeitig auf einer größeren Breite reinigen zu können ist es sinnvoll, wenn mehrere quer zur Laufrichtung des Transportbandes nebeneinander angeordnete Reinigungsdüsen vorgesehen sind. Um das Transportband auf seiner Breite zuverlässig zu reinigen ist es des weiteren sinnvoll, wenn sich die Reinigungsstellen zumindest abschnittweise überlappen.In order to be able to clean the conveyor belt at the same time over a greater width, it is useful if a plurality of cleaning nozzles arranged side by side transversely to the direction of travel of the conveyor belt are provided. In order to reliably clean the conveyor belt on its width, it is also useful if the cleaning points overlap at least in sections.

Um des weiteren zu gewähren, dass das Transportband in seiner gesamten Breite zuverlässig gereinigt werden kann ist es sinnvoll, wenn zumindest zwei der Reinigungsdüsen unterschiedlich zueinander beabstandet sind. Hierbei ist es weiter vorteilhaft, wenn die Teilung der Scan - Schritte beim quer Traversieren der Reinigungsvorrichtung ungleich der Teilung der Abstände der Reinigungsdüsen ist.In order to further ensure that the conveyor belt can be reliably cleaned in its entire width, it makes sense if at least two of the cleaning nozzles are spaced differently from each other. In this case, it is also advantageous if the division of the scanning steps during the transverse traversing of the cleaning device is not equal to the pitch of the distances of the cleaning nozzles.

Um des weiteren eine gute Überlappung der Reinigungsstellen zu gewährleisten ist es sinnvoll, wenn zumindest zwei der Reinigungsdüsen nicht parallel zueinander angeordnet sind. Um die Reinigungsleistung zu erhöhen, können diese derart orientiert sein, dass die aus den Reinigungsdüsen austretenden Strahlen des Reinigungsmediums auf die Reinigungsstelle fokusiert sind.In order to further ensure a good overlap of the cleaning points, it makes sense if at least two of the cleaning nozzles are not arranged parallel to each other. In order to increase the cleaning performance, they may be oriented such that the emerging from the cleaning nozzles jets of cleaning medium are focused on the cleaning site.

Bewährt haben sich Reinigungsdüsen mit rundem Querschnitt. Deshalb ist es vorteilhaft, wenn zumindest eine Reinigungsdüse einen runden Querschnitt hat.Have proven cleaning nozzles with round cross-section. Therefore, it is advantageous if at least one cleaning nozzle has a round cross-section.

Vorteilhaft bzgl. der Verfügbarkeit und des Wasserverbrauchs sind Reinigungsdüsen mit einem Durchmesser zwischen 0,1mm und 0,5mm, bevorzugt zwischen 0,15mm und 0,3mm.Advantageous in terms of availability and water consumption are cleaning nozzles with a diameter between 0.1mm and 0.5mm, preferably between 0.15mm and 0.3mm.

Um effektiv zu reinigen ist es sinnvoll, wenn das Reinigungsmedium beim Austritt aus der Reinigungsdüse einen Druck zwischen 20bar und 1000bar, bevorzugt zwischen 200bar und 500bar hat.To effectively clean it makes sense if the cleaning medium at the outlet from the cleaning nozzle has a pressure between 20bar and 1000bar, preferably between 200bar and 500bar.

Das Reinigungsmedium hat eine flüssige und/ oder gasförmige Komponente. Als Reinigungsmedium wird oftmals Wasser mit oder ohne Zusätze verwendet.The cleaning medium has a liquid and / or gaseous component. As a cleaning medium, water is often used with or without additives.

Um lokale Kondensation zu verhindern ist es sinnvoll, wenn die Temperatur des Reinigungsmediums an die Umgebungstemperatur angepasst ist. Da, abhängig vom Ort, Temperaturen zwischen 20°C und 120°C, oftmals zwischen 50°C und 100°C herrschen, sieht eine bevorzugte Ausführungsform der Erfindung vor, dass das Reinigungsmedium eine Temperatur zwischen 20°C und 120°C, bevorzugt zwischen 50°C und 100°C hat.To prevent local condensation, it makes sense if the temperature of the cleaning medium is adapted to the ambient temperature. Since, depending on the location, temperatures between 20 ° C and 120 ° C, often between 50 ° C and 100 ° C prevail, a preferred embodiment of the invention provides that the cleaning medium is a temperature between 20 ° C and 120 ° C, preferred between 50 ° C and 100 ° C.

Um im Saugkanal einen Sog zu erzeugen und damit die Saugleistung des Saugkanals weiter zu erhöhen, sieht eine bevorzugte Weiterbildung der Erfindung vor, dass in Richtung des reflektierten / im Saugkanal strömenden Reinigungsmediums nach der Saugöffnung der Saugkanal eine Unterdruckvorrichtung aufweist.In order to create a suction in the suction channel and thus to further increase the suction power of the suction channel, a preferred development of the invention provides that in the direction of the reflected / flowing in the suction channel cleaning medium after the suction opening of the suction channel has a vacuum device.

Es gibt unterschiedliche Möglichkeiten Unterdruck im Saugkanal zu erzeugen. Nach einer weiteren Ausführungsform der Erfindung weist die Unterdruckeinrichtung zumindest eine Injektordüse zur Injektion eines Injektionsmediums auf. Hierdurch wird ein Unterdruck in der Art eines Wasserstrahlvakuums durch Sogwirkung der mit dem Injektionsmedium beschleunigten Luftschichten erzeugt, so dass Schmutzpartikel, Nebel und Tropfen von Reinigungsmedium in Richtung der Auslassöffnung mitgerissen werden. Ein weiterer Vorteil der Injektion des Injektionsmediums besteht darin, dass der Saugkanal permanent gespült wird, wodurch Schmutzablagerungen im Saugkanal reduziert oder verhindert werden können.There are different ways to create negative pressure in the suction channel. According to a further embodiment of the invention, the vacuum device has at least one injector nozzle for injection of an injection medium. As a result, a negative pressure in the manner of a water jet vacuum is created by the suction effect of the air layers accelerated with the injection medium, so that dirt particles, mist and drops of cleaning medium are entrained in the direction of the outlet opening. Another advantage of the injection of the injection medium is that the suction channel is permanently flushed, whereby dirt deposits in the suction channel can be reduced or prevented.

Da bei Injektion eines Injektormediums ein zusätzlicher Stoff in den Saugkanal eingebracht wird, muss sich zur Vermeidung von Rückstau der Querschnitt des Saugkanals im Bereich der zumindest einen Injektordüse beginnend in Richtung des im Saugkanal strömenden Reinigungsmediums verbreitern.Since an additional substance is introduced into the suction channel when an injector medium is injected, the cross-section of the suction channel in the area of the at least one injector nozzle has to widen in the direction of the cleaning medium flowing in the suction channel to avoid backflow.

Um die Saugleistung des Saugkanals weiter zu erhöhen ist es sinnvoll, wenn in Richtung des im Saugkanal/Abflussleitung strömenden Reinigungsmediums mehrere Injektordüsen hintereinander liegend angeordnet sind, wobei das Injektionsmedium, welches aus der / den in Strömungsrichtung vorn angeordneten Injetordüse(n) austritt mit einem höheren Druck beaufschlagt ist als das aus der / den dahinter liegenden Injektordüse(n).In order to further increase the suction power of the suction channel, it makes sense if a plurality of injector nozzles are arranged one behind the other in the direction of the cleaning medium flowing in the suction channel / drain line, the injection medium emerging from the inlet nozzle (s) located upstream in the direction of flow having a higher one Pressure is applied as that from the / the underlying injector (s).

Um eine hohe Saugleistung im Saugkanal zu gewährleisten, muss die Strömung möglichst wenig turbolent bestenfalls laminar sein. Vorteilhafterweise ist deshalb die zumindest eine Injektordüse derart angeordnet, dass das Injektionsmedium zumindest abschnittweise parallel zur Mittelachse des Abführkanals injiziert wird.In order to ensure a high suction power in the suction channel, the flow must be laminar at best as little turbolent as possible. Advantageously, therefore, the at least one injector nozzle is arranged such that the injection medium is at least partially injected parallel to the central axis of the discharge channel.

Bei Versuchen hat sich gezeigt, dass zur Erzeugung eines zufrieden stellenden Unterdrucks das Injektionsmedium, welches aus der Injektordüse tritt, welche in Strömungsrichtung vom angeordnet ist, beim Austritt einen Druck zwischen 20bar und 1000bar, bevorzugt zwischen 200bar und 500bar habt und wenn das Injektormedium, welches aus der in Strömungsrichtung dahinter liegenden Injektordüse tritt, beim Austritt einen Druck zwischen 20bar und 40bar hat.In experiments, it has been found that to produce a satisfactory negative pressure, the injection medium, which occurs from the injector, which is arranged in the direction of flow, at the outlet pressure between 20bar and 1000bar, preferably between 200bar and 500bar have and if the injector, which from the injector located downstream in the flow direction, at the outlet has a pressure between 20bar and 40bar.

Vorteilhaft ist, wenn zumindest eine Injektordüse einen runden oder ovalen oder rechteckigen Querschnitt hat und deren Durchmesser im Bereich zwischen 0,1 mm und 0,5mm, bevorzugt zwischen 0,15mm und 0,3mm liegt. Die dahinter liegende Injektordüse hat hierbei vorzugsweise einen 1 mm und 2mm, bevorzugt 1,5mm.It is advantageous if at least one injector nozzle has a round or oval or rectangular cross section and whose diameter is in the range between 0.1 mm and 0.5 mm, preferably between 0.15 mm and 0.3 mm. The injector nozzle lying behind this preferably has a 1 mm and 2 mm, preferably 1.5 mm.

Des weiteren kann das Injektormedium eine flüssige und/ oder gasförmige Komponente haben.Furthermore, the injector medium may have a liquid and / or gaseous component.

Nach weiteren bevorzugten Ausführungsformen ist das Injektormedium bzgl. der Umgebungstemperatur erwärmt oder abgekühlt ist.According to further preferred embodiments, the injector medium is heated or cooled with respect to the ambient temperature.

Durch Erwärmung wird Kondensation im Saugkanal verhindert. Des weiteren kann effektiver gespült werden. Das Injektormedium weist hierbei eine Temperatur zwischen 30°C und 100°C, bevorzugt zwischen 30°C und 70°C auf.Heating prevents condensation in the suction channel. Furthermore, it can be rinsed more effectively. The injector medium in this case has a temperature between 30 ° C and 100 ° C, preferably between 30 ° C and 70 ° C.

Durch Abkühlung wird lokal eine Druckerniedrigung erzeugt, wodurch eine verbesserte Saugleistung im Saugkanal erzielbar ist. Das Injektormedium hat hierbei eine Temperatur zwischen 4°C und 50°C, bevorzugt zwischen 8°C und 25°C.By cooling, a reduction in pressure is locally generated, whereby an improved suction power in the suction channel can be achieved. The injector medium in this case has a temperature between 4 ° C and 50 ° C, preferably between 8 ° C and 25 ° C.

Vorteilhafterweise ist in Laufrichtung des Transportbandes nach der zumindest einen Reinigungsdüse zumindest ein Luftmesser angeordnet ist, durch welches das Transportband mit Druckluft beaufschlagbar ist, die im Winkel β zwischen 10° und 80°, bevorzugt zwischen 50° und 70° in Laufrichtung auf das Transportband trifft. Durch das Luftmesser können Reste des Reinigungsmediums, die sich auf der Oberfläche oder im Transportband befinden, abgeblasen und / oder zerstäubt werden. Des weiteren kann Falschlufteintritt in den Bereich der Reinigungsdüsen verhindert werden.Advantageously, at least one air knife is arranged in the running direction of the conveyor belt after the at least one cleaning nozzle, through which the conveyor belt can be acted upon with compressed air, which meets at an angle β between 10 ° and 80 °, preferably between 50 ° and 70 ° in the running direction on the conveyor belt , Remains of the cleaning medium, which are located on the surface or in the conveyor belt, can be blown off and / or atomized by the air knife. Furthermore, false air inlet into the area of the cleaning nozzles can be prevented.

Es ist sowohl denkbar, dass das Luftmesser zumindest abschnittweise mehrere Einzelstrahlen bildet, die quer zur Laufrichtung des Transportbandes nebeneinander angeordnet sind und / oder dass das Luftmesser zumindest abschnittweise einen schlitzartigen sich quer zur Laufrichtung des Transportbandes erstreckenden Luftschleier bildet.It is also conceivable that the air knife at least partially forms a plurality of individual jets, which are arranged transversely to the running direction of the conveyor belt side by side and / or that the air knife at least partially forms a slot-like transverse to the direction of the conveyor belt extending air curtain.

Versuche haben gezeigt, dass das Luftmesser seine Aufgaben besonders gut erfüllt, wenn die Druckluft einen Druck zwischen 1 bar und 10bar, bevorzugt zwischen 4bar und 7bar hat.Experiments have shown that the air knife performs its tasks particularly well when the compressed air has a pressure between 1 bar and 10 bar, preferably between 4bar and 7bar.

Vorteilhafterweise ist die Druckluft auf eine Temperatur zwischen 20°C und 200°C, bevorzugt zwischen 50°C und 200°C erwärmt. Wird die über Umgebungstemperatur erwärmte Druckluft auf / in das Transportband geblasen, so findet eine aktive Nachtrockung des Transportbandes statt.Advantageously, the compressed air is heated to a temperature between 20 ° C and 200 ° C, preferably between 50 ° C and 200 ° C. If the compressed air, which has been heated above ambient temperature, is blown onto / into the conveyor belt, an active drying of the conveyor belt takes place.

Nachfolgend wird die Erfindung anhand eines vorteilhaften Ausführungsbeispiels anhand der folgenden Zeichnungen erläutert. Es zeigen:

Figur 1
eine erfindungsgemäße Vorrichtung zum Reinigen eines Transportbandes im Längsschnitt,
Figur 2
einen erfindungsgemäßen Reinigungskopf in Frontalansicht,
Figur 3
die erfindungsgemäße Reinigungsvorrichtung in Anordnung zur Papiermaschine.
The invention will be explained with reference to an advantageous embodiment with reference to the following drawings. Show it:
FIG. 1
a device according to the invention for cleaning a conveyor belt in longitudinal section,
FIG. 2
a cleaning head according to the invention in a front view,
FIG. 3
the cleaning device according to the invention in arrangement with the paper machine.

Die Figur 1 zeigt eine erfindungsgemäße Reinigungsvorrichtung 1 zum Reinigen eines Transportbandes 2 einer bahnverarbeitenden Maschine. Die Reinigungsvorrichtung 1 hat mehrere in einem Reinigungskopf 18 angeordnete Reinigungsdüsen 3, von denen in der vorliegenden Darstellung nur eine zu erkennen ist. Durch die Reinigungsdüsen 3 ist das Transportband 2 mit einem Reinigungsmedium 4 an einer Reinigungsstelle 5 beaufschlagbar. Die Reinigungsdüsen 3 sind derart angeordnet, dass das Reinigungsmedium 4 als Strahl 7 immer gegen die Laufrichtung 6 des Transportbandes 2 geneigt unter einem Einfallswinkel α zwischen 5° und 85° an der Reinigungsstelle 5 auf das Transportband 2 trifft.The FIG. 1 shows a cleaning device 1 according to the invention for cleaning a conveyor belt 2 of a web-processing machine. The cleaning device 1 has a plurality of cleaning nozzles 3 arranged in a cleaning head 18, of which only one can be seen in the present illustration. Through the cleaning nozzles 3, the conveyor belt 2 can be acted upon by a cleaning medium 4 at a cleaning point 5. The cleaning nozzles 3 are arranged such that the cleaning medium 4 as a jet 7 always against the running direction 6 of the conveyor belt 2 at an angle of incidence α between 5 ° and 85 ° at the cleaning station 5 hits the conveyor belt 2.

In der vorliegenden Darstellung schließt der einfallende Strahl 7 mit der Transportbahn 2 einen Einfallswinkel α von 45° ein. Versuche haben gezeigt, dass allgemein sehr zufrieden stellende Reinigungsergebnisse erzielt werden, wenn der Einfallswinkel α bevorzugt zwischen 15° und 75°, besonders bevorzugt zwischen 30° und 50° ist.In the present illustration, the incident beam 7 with the transport path 2 includes an angle of incidence α of 45 °. Experiments have shown that generally very satisfactory cleaning results are achieved when the angle of incidence α is preferably between 15 ° and 75 °, more preferably between 30 ° and 50 °.

Die Reinigungsdüsen 3 sind in Bezug zum Transportband 2 feststehend, insbesondere nicht rotierbar.The cleaning nozzles 3 are fixed with respect to the conveyor belt 2, in particular not rotatable.

In Bezug zur Reinigungsstelle 5 den Reinigungsdüsen 3 gegenüberliegend angeordnet weist die Vorrichtung 1 zum Reinigen des Transportbandes 2 einen Saugkanal 8 mit Saugöffnung 9 auf. Der Saugkanal 8 hat eine Mittelachse 10. Durch die Saugöffnung 9 tritt mit Schmutz vermengtes Reinigungsmedium 4 in den Saugkanal 8 ein, nachdem dieses vom Transportband 2 zurückgeworfen wird. Ein Großteil des vom Transportband zurückgeworfenen Reinigungsmediums 4 wird als aufgefächerter Strahl 11 unter einem mittleren Winkel γ vom Transportband 2 gegen die Laufrichtung 6 des Transportbandes 2 reflektiert. Die Saugöffnung 9 erstreckt sich auf der Seite, die in Bezug zur Reinigungsstelle 5 den Reinigungsdüsen 3 gegenüberliegend angeordnet ist. Erfindungsgemäß weist die Saugöffnung 9 in Richtung der Reinigungsstelle 5 und damit in Richtung des reflektierten Strahls 11. Die Mittelachse 10 des Saugkanals 8 im Bereich der Saugöffnung 9 schließt erfindungsgemäß mit dem Transportband 2 einen Winkel δ zwischen 5° und 75° ein. Im vorliegenden Ausführungsbeispiel erstreckt sich die Mittelachse 10 des Saugkanals 8 im Bereich der Saugöffnung 9 in Verlängerung zu dem unter dem mittleren Winkel γ=15° reflektierten Strahl 11. D.h. der Winkel δ ist δ=15° was bedeutet, dass die Mittelachse 10 des Saugkanals 8 im Bereich der Saugöffnung 9 mit dem mittleren Winkel γ den Winkel Σ=0° einschließt und dass die Verlängerung der Mittelachse 10 des Saugkanals 8 im Bereich der Saugöffnung 9 das Transportband 2 im Bereich der Reinigungsstelle 5 schneidet.In relation to the cleaning point 5 arranged opposite the cleaning nozzles 3, the device 1 for cleaning the conveyor belt 2 has a suction channel 8 with a suction opening 9. The suction channel 8 has a central axis 10. Through the suction opening 9 enters with dirt mixed cleaning medium 4 in the suction channel 8, after this is reflected by the conveyor belt 2. A large part of the thrown back from the conveyor belt cleaning medium 4 is reflected as a fanned beam 11 at an average angle γ from the conveyor belt 2 against the running direction 6 of the conveyor belt 2. The suction opening 9 extends on the side which is arranged opposite the cleaning nozzle 3 with respect to the cleaning point 5. According to the invention, the suction opening 9 in the direction of the cleaning point 5 and thus in the direction of the reflected beam 11. The central axis 10 of the suction channel 8 in the region of the suction opening 9 according to the invention with the conveyor belt 2 forms an angle δ between 5 ° and 75 °. In the present embodiment, the center axis 10 of the suction channel 8 extends in the region of the suction opening 9 in extension to the jet 11 which is reflected at the middle angle γ = 15 °. the angle δ is δ = 15 ° which means that the center axis 10 of the suction channel 8 in the region of the suction opening 9 with the average angle γ the angle Σ = 0 ° and that the extension of the central axis 10 of the suction channel 8 in the region of the suction opening. 9 the conveyor belt 2 in the region of the cleaning point 5 cuts.

Wie aus der Figur 1 zu erkennen ist, dass sind die Querschnittsfläche 27 der Saugöffnung 9 und der Abstand A zwischen der Querschnittsfläche 27 und der Reinigungsstelle 5 derart aufeinander abgestimmt, dass durch die Querschnittsfläche 27 der Saugöffnung 9 ein unter dem mittleren Winkels γ reflektierter und im Öffnungswinkelbereich θ ±25° aufgefächerter Strahl des Reinigungsmediums durch die Querschnittsfläche 27 der Saugöffnung 9 treten kann.Like from the FIG. 1 It can be seen that the cross-sectional area 27 of the suction opening 9 and the distance A between the cross-sectional area 27 and the cleaning point 5 are matched to one another such that the cross-sectional area 27 of the suction opening 9 reflects a value below the mean angle γ and θ ± 25 ° in the opening angle range fanned beam of the cleaning medium through the cross-sectional area 27 of the suction opening 9 can occur.

Des weiteren wird in Laufrichtung 6 des Transportbandes 2 nach der Saugöffnung 9 angeordnet ein Saugraum 12 gebildet. Der Saugraum 12 erstreckt sich im vorliegenden Ausführungsbeispiel in Richtung der Reinigungsdüsen 3 und umgibt diese. Der Saugraum 12 hat eine Öffnung 13, die waagerecht zum Transportband 2 verläuft und zum Transportband 2 zwischen 1mm und 10mm, bevorzugt zwischen 3mm und 5mm beabstandet ist.Furthermore, arranged in the running direction 6 of the conveyor belt 2 after the suction opening 9, a suction chamber 12 is formed. The suction chamber 12 extends in the present embodiment in the direction of the cleaning nozzles 3 and surrounds them. The suction chamber 12 has an opening 13 which extends horizontally to the conveyor belt 2 and to the conveyor belt 2 between 1mm and 10mm, preferably between 3mm and 5mm spaced.

Der Saugkanal 8 verläuft in Strömungsrichtung des reflektierten Strahls 11 zuerst gekrümmt mit einem Krümmungsradius 100mm und erstreckt sich danach gerade wodurch der Saugkanal 8 die Form eines "Schuhs" erhält.The suction channel 8 extends in the flow direction of the reflected beam 11 first curved with a radius of curvature 100mm and then extends straight through which the suction channel 8 is replaced by the shape of a "shoe".

In Richtung des reflektierten Strahls 11 bzw. des durch den Saugkanal strömenden Reinigungsmediums 4 weist der Saugkanal 8 nach der Saugöffnung 9 eine Unterdruckvorrichtung in Form einer oder mehreren Injektordüsen 16 zur Injektion eines Injektionsmediums 17 auf. Ein Abschnitt 14 des Saugkanals 8, der sich zwischen Saugöffnung 9 und Injektordüse 16 erstreckt, hat eine konstante Querschnittsfläche.In the direction of the reflected beam 11 or of the cleaning medium 4 flowing through the suction channel, the suction channel 8 has, after the suction opening 9, a vacuum device in the form of one or more injector nozzles 16 for injection of an injection medium 17. A portion 14 of the suction channel 8, which extends between the suction opening 9 and the injector nozzle 16, has a constant cross-sectional area.

Der sich an den Abschnitt 14 anschließende Abschnitt 15 des Saugkanals 8 erstreckt sich gerade. Der Querschnitt des Saugkanals im Bereich 15 verbreitert sich von der Injektordüse 16 beginnend in Richtung des im Saugkanal 8 strömenden Reinigungsmediums 4. Die Injektordüse 16 ist derart angeordnet, dass das Injektionsmedium 17 zumindest abschnittweise parallel zur Mittelachse 10 des Abführkanals 8 im Bereich 15 injiziert wird.The adjoining the section 14 section 15 of the suction channel 8 extends straight. The cross section of the suction channel in the region 15 widens starting from the injector nozzle 16 in the direction of the cleaning medium 4 flowing in the suction channel 8. The injector nozzle 16 is arranged such that the injection medium 17 is injected at least in sections parallel to the central axis 10 of the discharge channel 8 in the region 15.

Vorteilhaft sind Querschnittsflächen des Saugkanals 8 in den Bereichen von 100qmm bis 10000qmm, bevorzugt von 500qmm bis 3000qmm, besonders von 1000qmm bis 2000qmm.Advantageously, cross-sectional areas of the suction channel 8 in the ranges of 100qmm to 10000qmm, preferably from 500qmm to 3000qmm, especially from 1000qmm to 2000qmm.

Der Saugkanal und / oder die Saugöffnung kann hierbei einen runden oder viereckigen Querschnitt haben.The suction channel and / or the suction opening may in this case have a round or quadrangular cross-section.

Das Injektionsmedium 17 hat beim Austritt aus der Injektordüse einen Druck zwischen 20bar und 1000bar, bevorzugt zwischen 200bar und 500bar. Des weiteren kann die Injektordüse 16 sowohl einen runden oder ovalen oder rechteckigen Querschnitt haben. Vorzugsweise hat die Injektordüse 16 einen Durchmesser zwischen 0,1mm und 0,5mm, bevorzugt zwischen 0,15mm und 0,3mm. Das Injektormedium kann eine flüssige und/ oder gasförmige Komponente haben und ist im vorliegenden Ausführungsbeispiel Wasser. Um die Sogwirkung und damit die Saugleistung aufgrund von lokaler Druckerniedrigung im Saugkanal 8 zu erhöhen, ist im vorliegenden Ausführungsbeispiel das Injektormedium 17 bzgl. der Umgebungstemperatur abgekühlt und hat eine Temperatur von 8°C.The injection medium 17 has a pressure between 20 bar and 1000 bar, preferably between 200 bar and 500 bar, on exiting the injector nozzle. Furthermore, the injector nozzle 16 may have both a round or oval or rectangular cross-section. Preferably, the injector nozzle 16 has a diameter between 0.1 mm and 0.5 mm, preferably between 0.15 mm and 0.3 mm. The injector medium may have a liquid and / or gaseous component and is water in the present embodiment. In order to increase the suction effect and thus the suction power due to local pressure reduction in the suction channel 8, in the present embodiment, the injector 17 is cooled with respect to the ambient temperature and has a temperature of 8 ° C.

In Laufrichtung 6 des Transportbandes 2 nach den Reinigungsdüsen 3 ist ein Luftmesser 19 angeordnet, durch welches das Transportband 2 mit Druckluft 20 beaufschlagbar ist, die im Winkel β zwischen 10° und 80°, bevorzugt zwischen 50° und 70° in Laufrichtung 6 auf das Transportband 2 trifft.In the running direction 6 of the conveyor belt 2 after the cleaning nozzles 3, an air knife 19 is arranged, through which the conveyor belt 2 can be acted upon with compressed air 20, the angle β between 10 ° and 80 °, preferably between 50 ° and 70 ° in the direction 6 on the Conveyor belt 2 hits.

Das Luftmesser 19 kann hierbei zumindest abschnittweise durch mehrere Einzelstrahlen gebildet werden, die quer zur Laufrichtung 6 des Transportbandes 2 nebeneinander angeordnet sind und / oder zumindest abschnittweise durch einen schlitzartigen sich quer zur Laufrichtung 6 des Transportbandes 2 erstreckenden Luftschleier gebildet werden.The air knife 19 may in this case at least partially formed by a plurality of individual jets, which are arranged transversely to the running direction 6 of the conveyor belt 2 side by side and / or at least partially formed by a slot-like transverse to the running direction 6 of the conveyor belt 2 extending air curtain.

Die Druckluft hat im vorliegenden Ausführungsbeispiel einen Druck von 5bar. Um das nach der Reinigung noch nasse Transportband 2 aktiv nach zu trockenen, ist die Druckluft 20 über Umgebungstemperatur auf eine Temperatur von 170°C erwärmt.The compressed air has a pressure of 5bar in the present embodiment. To actively dry the still wet conveyor belt 2 after cleaning, the compressed air 20 is heated above ambient temperature to a temperature of 170 ° C.

Die Figur 2a (Schnittlinie a-a in Figur 1) zeigt den Reinigungskopf 18 in Frontansicht mit Blick auf die Reinigungsdüsen 3, 3', 3" und 3"'. Wie aus der Darstellung zu erkennen ist, sind die Reinigungsdüsen 3, 3', 3" und 3''' nebeneinander liegend angeordnet, wobei der Reinigungskopf 18 derart ausgerichtet ist, dass sich die Reinigungsdüsen 3, 3', 3" und 3"' quer zur Laufrichtung 6 des Transportbandes 2 nebeneinander erstrecken. Des weiteren ist zu erkennen, dass sämtliche Reinigungsdüsen 3,3',3" und 3''' unterschiedlich zueinander beabstandet sind (D3<D1<D2). Des weiteren sind die Reinigungsdüsen 3, 3', 3" und 3''' derart zueinander bzgl. der Senkrechten 28 um die Winkel ξ1, ξ2, ξ3 und ξ4 geneigt, dass die aus den Reinigungsdüsen 3, 3', 3" und 3"' austretenden Strahlen 7,7',7" und 7"' an der Reinigungsstelle fokusiert werden (Siehe Figur 2b; Schnittlinie b-b in Figur 1).The FIG. 2a (Section line aa in FIG. 1 ) shows the cleaning head 18 in a front view with a view of the cleaning nozzles 3, 3 ', 3 "and 3"'. As can be seen from the illustration, the cleaning nozzles 3, 3 ', 3 "and 3''' arranged side by side, wherein the cleaning head 18 is oriented such that the cleaning nozzles 3, 3 ', 3" and 3 "' Furthermore, it can be seen that all the cleaning nozzles 3, 3 ', 3 "and 3'" are spaced apart from one another in a different manner (D3 <D1 <D2). Furthermore, the cleaning nozzles 3, 3 ', 3 "and 3''' in relation to each other with respect to the vertical 28 by the angle ξ1, ξ2, ξ3 and ξ4 inclined that from the cleaning nozzles 3, 3 ', 3" and 3 '' emanating rays 7,7 ', 7 "and 7"' are focused at the cleaning site (See FIG. 2b ; Section line bb in FIG. 1 ).

Im vorliegenden Ausführungsbeispiel haben die Reinigungsdüsen 3,3',3" und 3"' einen runden Querschnitt mit einem Durchmesser von 0,2mm. Das aus den Reinigungsdüsen austretende Reinigungsmedium 4 hat beim Austritt aus den Reinigungsdüsen 3,3',3" und 3''' einen Druck von 350bar. Als Reinigungsmedium 4 findet Wasser Verwendung. Um Kondensation des Reinigungsmediums zu verhindern, ist dieses über Raumtemperatur auf 100°C erwärmt.In the present embodiment, the cleaning nozzles 3, 3 ', 3 "and 3"' have a round cross section with a diameter of 0.2 mm. The cleaning medium 4 exiting from the cleaning nozzles has a pressure of 350 bar on exiting the cleaning nozzles 3, 3 ', 3 "and 3''' Water is used as the cleaning medium 4. To prevent condensation of the cleaning medium, this is above room temperature to 100 ° C heated.

Die Figur 3 zeigt eine Ansicht der Reinigungsvorrichtung 1 in Kombination mit einer Maschine zur Papierherstellung 25. Die Reinigungsvorrichtung 1 ist mit einer Bewegungseinheit 21 verbunden, die es ermöglicht, die Reinigungsvorrichtung quer (CD) zur Laufrichtung 6 der Transportbahn 2 zu bewegen. In Strömungsrichtung des weggeführten Reinigungsmediums4 nach der Bewegungseinheit 21 ist eine Abflussleitung 23 angeordnet, durch welche das Reinigungsmedium weiter weggeführt wird. In der Abflussleitung 23 sind Strömungsbeschleuniger 22 in Form von Injektordüsen 22 angeordnet. Die Injektordüsen 22 haben einen Düsendurchmesser zwischen 1mm und 2mm, bevorzugt 1,5mm. Der Druck des Injektormediums beim austritt aus den Injektordüsen 22 ist im Bereich von 20bar bis 40bar. Somit weist das System mehrere in Strömungsrichtung des wegzuführenden Reinigungsmediums 4 hintereinander angeordnete Injektordüsen 16 und 22 auf. Hierbei ist das von den Injektordüsen 22 injizierte Injektormedium 26 mit einem geringeren Druck beaufschlagt als das Injektormedium 17.The FIG. 3 shows a view of the cleaning device 1 in combination with a papermaking machine 25. The cleaning device 1 is connected to a moving unit 21, which makes it possible to move the cleaning device transversely (CD) to the running direction 6 of the transport path 2. In the flow direction of the carried away cleaning medium 4 after the moving unit 21, a drain line 23 is arranged, through which the cleaning medium is further led away. In the discharge line 23, flow accelerators 22 in the form of injector nozzles 22 are arranged. The injector nozzles 22 have a nozzle diameter between 1 mm and 2 mm, preferably 1.5 mm. The pressure of the injector medium exiting the injector nozzles 22 is in the range of 20bar to 40bar. Thus, the system has a plurality of injector nozzles 16 and 22 arranged one behind the other in the flow direction of the cleaning medium 4 to be removed. In this case, the injector medium 26 injected by the injector nozzles 22 is subjected to a lower pressure than the injector medium 17.

Claims (41)

  1. Method for cleaning a moving transport belt (2) of a web-processing machine, in which a cleaning medium (4) is applied to the transport belt (2) by a cleaning nozzle (3),
    the cleaning medium (4) always striking the transport belt (2) at a cleaning point (5) as a jet (7) inclined counter to the running direction (6) of the transport belt (2) at an angle of incidence α between 5° and 85°, and
    a suction opening (9) of a suction duct (8) being arranged in such a way that the proportion of cleaning medium (11) reflected from the transport belt (2) counter to the running direction of the transport belt (2) at an average angle γ = 15°±10° and fanned out in the opening angle range θ of ±15° enters through the cross-sectional area (27) of the suction opening.
  2. Method according to Claim 1,
    characterized in that
    the cleaning medium (4) emerges from the cleaning nozzle (3) under a pressure between 20 bar and 1000 bar.
  3. Method according to Claim 1 or 2,
    characterized in that
    the angle of incidence α is preferably between 15° and 75°, particularly preferably between 30° and 60°.
  4. Method according to at least one of the preceding claims,
    characterized in that
    the at least one cleaning nozzle (3) is not operated rotatably.
  5. Method according to at least one of the preceding claims,
    characterized in that
    after it has been thrown back from the transport belt (2), the cleaning medium (11) mixed with dirt enters a suction duct (8) having a suction opening (27), the suction opening (27) extending, at least in some sections, on the side which is arranged opposite the cleaning nozzle (3) in relation to the cleaning point (5), the suction opening (9) pointing in the direction of the cleaning point (5), and the mid-axis (10) of the suction duct (8) in the region of the suction opening (9) forming an angle δ between 5° and 75° with the transport belt (2).
  6. Method according to Claim 5,
    characterized in that
    the angle δ is preferably between 10° and 50°, particularly preferably between 15° and 35°.
  7. Method according to at least one of the preceding claims,
    characterized in that
    a large part of the cleaning medium (11) thrown back from the transport belt (2) is reflected fanned out at an average angle γ, the mid-axis (10) of the suction duct (8) in the region of the suction opening (9) running substantially in extension of the average angle γ.
  8. Method according to at least one of the preceding claims,
    characterized in that
    the mid-axis (10) of the suction duct (8) in the region of the suction opening (9) forms with the average angle γ the angle Σ in the range between ±25°, preferably ±15°, particularly preferably ±5°.
  9. Method according to at least one of the preceding claims,
    characterized in that
    the cleaning medium (4) strikes the transport belt (2) at a cleaning point (5), and in that the extension of the mid-axis (10) of the suction duct (8) in the region of the suction opening (9) intersects the transport belt (2) in the region of the cleaning point (5).
  10. Method according to at least one of the preceding claims,
    characterized in that
    the cross-sectional area (27) of the suction opening (9) and a distance (A) of the suction opening (9) from the cleaning point (5) are coordinated with each other in such a way that, through the cross-sectional area (27) of the suction opening (9), a jet (11) of the cleaning medium (4) reflected at the average angle γ and in the opening angle range θ of ±15°, preferably of ±25°, can enter through the cross-sectional area (27) of the suction opening (9).
  11. Method according to at least one of the preceding claims,
    characterized in that
    in the running direction (6) of the transport belt (2), after the suction opening (9), there is formed a suction chamber (12) which, at least in some sections, extends in the direction of the at least one cleaning nozzle (3) and has an opening (13) that runs horizontally in relation to the transport belt (2).
  12. Method according to Claim 11,
    characterized in that
    the opening (13) is spaced apart from the transport belt (2) by between 1 mm and 10 mm, preferably between 3 mm and 5 mm.
  13. Method according to at least one of the preceding Claims 11-12,
    characterized in that
    the suction chamber (12) extends to the at least one cleaning nozzle (3).
  14. Method according to at least one of the preceding Claims 11-13,
    characterized in that
    the at least one cleaning nozzle (3) is surrounded by the suction chamber (12).
  15. Method according to at least one of the preceding claims,
    characterized in that,
    at least in some sections, the suction duct (8) extends in a straight line and/or a curve with a radius of curvature between 10 and 200 mm.
  16. Method according to at least one of the preceding claims,
    characterized in that,
    at least in some sections, the suction duct (8) has a constant cross-sectional area.
  17. Method according to at least one of the preceding claims,
    characterized in that
    the suction duct (8) has a cross-sectional area of 100 mm2 to 10 000 mm2, preferably of 500 mm2 to 3000 mm2, particularly of 1000 mm2 to 2000 mm2.
  18. Method according to at least one of the preceding claims,
    characterized in that
    the suction duct (8) and/or the suction opening (9) have/has a round or four-cornered cross section.
  19. Method according to at least one of the preceding claims,
    characterized in that
    a plurality of cleaning nozzles (3) arranged beside one another transversely with respect to the running direction (6) of the transport belt (2) are used.
  20. Method according to at least one of the preceding claims,
    characterized in that
    at least two of the cleaning nozzles (3) are spaced apart differently from one another.
  21. Method according to at least one of the preceding claims,
    characterized in that
    at least two of the cleaning nozzles (3) are arranged not parallel to one another.
  22. Method according to at least one of the preceding claims,
    characterized in that
    a round cross section is chosen for at least one cleaning nozzle (3).
  23. Method according to at least one of the preceding claims,
    characterized in that
    the cleaning nozzles (3) have a diameter between 0.1 mm and 0.5 mm, preferably between 0.15 mm and 0.3 mm.
  24. Method according to at least one of the preceding claims,
    characterized in that,
    as it emerges from the cleaning nozzle (3), the cleaning medium (4) has a pressure between 200 bar and 500 bar.
  25. Method according to at least one of the preceding claims,
    characterized in that
    the cleaning medium (4) has a liquid and/or gaseous component.
  26. Method according to at least one of the preceding claims,
    characterized in that
    the cleaning medium (4) has a temperature of more than 20°C to 120°C, preferably between 50°C and 100°C.
  27. Method according to at least one of the preceding claims,
    characterized in that,
    in the direction of the reflected cleaning medium flowing in the suction duct (8), the suction duct (8) has a vacuum device after the suction opening (9).
  28. Method according to Claim 27,
    characterized in that
    the vacuum device has at least one injector nozzle (16) for the injection of an injection medium (17).
  29. Method according to Claim 28,
    characterized in that,
    beginning in the region of the at least one injector nozzle (16), the cross section of the suction duct (8) widens in the direction of the cleaning medium flowing in the suction duct (8).
  30. Method according to at least one of the preceding Claims 28-29,
    characterized in that,
    a plurality of injector nozzles (16) are arranged located one after another in the direction of the cleaning medium flowing in the suction duct (8), and in that the injection medium (17) which emerges from the injector nozzle(s) (16) arranged at the front in the flow direction has a higher pressure applied to it than the injector nozzle(s) (16) located thereafter.
  31. Method according to at least one of the preceding Claims 28-29,
    characterized in that
    the at least one injector nozzle (16) is arranged in such a way that, at least in some sections, the injection medium (17) is injected parallel to the mid-axis of the discharge duct, that is to say the suction duct (8).
  32. Method according to at least one of the preceding Claims 28-31,
    characterized in that,
    as it emerges from the at least one injector nozzle (16), the injection medium (17) has a pressure between 20 bar and 1000 bar, preferably between 200 bar and 500 bar.
  33. Method according to at least one of the preceding Claims 28-32,
    characterized in that
    the at least one injector nozzle (16) has a round or oval or rectangular cross section.
  34. Method according to at least one of the preceding Claims 28-33,
    characterized in that
    the at least one injector nozzle (16) has a diameter between 0.1 mm and 0.5 mm, preferably between 0.15 mm and 0.3 mm.
  35. Method according to at least one of the preceding Claims 28-34,
    characterized in that
    the injection medium (17) has a liquid and/or gaseous component.
  36. Method according to at least one of the preceding Claims 28-35,
    characterized in that
    the injection medium (17) is heated or cooled with respect to the ambient temperature.
  37. Method according to at least one of the preceding Claims 28-36,
    characterized in that
    the injection medium (17) has a temperature between 30°C and 100°C, preferably between 30°C and 70°C, or between 4°C and 50°C, preferably between 8°C and 25°C.
  38. Method according to at least one of the preceding claims,
    characterized in that
    in the running direction (6) of the transport belt (2), after the at least one cleaning nozzle (3), there is arranged at least one air knife (19), by means of which compressed air (20) is applied to the transport belt (2) and strikes the transport belt (2) at an angle β between 10° and 80°, preferably between 50° and 70°, in the running direction.
  39. Method according to Claim 38,
    characterized in that,
    at least in some sections, the air knife (19) forms a plurality of individual jets, which are arranged beside one another transversely with respect to the running direction (6) of the transport belt (2), and/or, at least in some sections, the air knife (19) forms a slot-like air curtain extending transversely with respect to the running direction (6) of the transport belt (2).
  40. Method according to Claim 38 or 39,
    characterized in that
    the compressed air (20) has a pressure between 1 bar and 10 bar, preferably between 4 bar and 7 bar.
  41. Method according to one of Claims 38 to 40,
    characterized in that
    the compressed air is heated to a temperature between 20°C and 200°C, preferably between 50°C and 200°C.
EP05740038A 2004-05-19 2005-04-28 Cleaning mehtod Active EP1753909B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004025291A DE102004025291A1 (en) 2004-05-19 2004-05-19 cleaning device
PCT/EP2005/051927 WO2005113890A1 (en) 2004-05-19 2005-04-28 Cleaning device

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EP1753909A1 EP1753909A1 (en) 2007-02-21
EP1753909B1 true EP1753909B1 (en) 2009-10-28

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AT (1) ATE447070T1 (en)
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Cited By (1)

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Publication number Priority date Publication date Assignee Title
US8808504B2 (en) 2009-12-21 2014-08-19 Paprima Industries Inc. Cleaning apparatus

Families Citing this family (2)

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Publication number Priority date Publication date Assignee Title
DE102010026831B4 (en) 2010-07-12 2021-08-12 Paprima Industries Inc. Drainage device for and method for removing dirt particles and waste water from a cleaning head
DE102015206747A1 (en) * 2015-04-15 2016-10-20 Voith Patent Gmbh cleaning device

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GB160861A (en) * 1919-09-13 1921-04-07 Charles Walmsley And Company L Improvements in and relating to paper making machinery
ATE209271T1 (en) * 1995-02-24 2001-12-15 Voith Paper Patent Gmbh CLEANING DEVICE
US6254730B1 (en) * 1999-02-09 2001-07-03 James Ross Limited Impact angle changing shower
US6468397B1 (en) * 1999-12-20 2002-10-22 Kimberly-Clark Worldwide, Inc. Scarfing shower for fabric cleaning in a wet papermaking process

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8808504B2 (en) 2009-12-21 2014-08-19 Paprima Industries Inc. Cleaning apparatus
US9222221B2 (en) 2009-12-21 2015-12-29 Paprima Industries Inc. Cleaning apparatus

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EP1753909A1 (en) 2007-02-21
WO2005113890A1 (en) 2005-12-01
DE102004025291A1 (en) 2005-12-08
DE502005008413D1 (en) 2009-12-10
ATE447070T1 (en) 2009-11-15

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