EP0069162B1 - Method and apparatus for controlling the density distribution of a dispersed particle mat - Google Patents

Method and apparatus for controlling the density distribution of a dispersed particle mat Download PDF

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Publication number
EP0069162B1
EP0069162B1 EP81105215A EP81105215A EP0069162B1 EP 0069162 B1 EP0069162 B1 EP 0069162B1 EP 81105215 A EP81105215 A EP 81105215A EP 81105215 A EP81105215 A EP 81105215A EP 0069162 B1 EP0069162 B1 EP 0069162B1
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EP
European Patent Office
Prior art keywords
width
over
discharge rollers
stream
suction
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EP81105215A
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German (de)
French (fr)
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EP0069162A1 (en
Inventor
Wolfgang Bürkner
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Carl Schenck AG
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Carl Schenck AG
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Application filed by Carl Schenck AG filed Critical Carl Schenck AG
Priority to DE8181105215T priority Critical patent/DE3170270D1/en
Priority to EP81105215A priority patent/EP0069162B1/en
Priority to FI820641A priority patent/FI73912C/en
Priority to US06/392,334 priority patent/US4504182A/en
Publication of EP0069162A1 publication Critical patent/EP0069162A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/10—Moulding of mats
    • B27N3/14—Distributing or orienting the particles or fibres
    • B27N3/146—Controlling mat weight distribution

Definitions

  • the invention relates to a method and a device for influencing the density distribution of a chip fleece to be scattered over a scattering width.
  • the chip material is milled over the entire cross-section of the chip supply due to the stacked spiked rollers.
  • a device according to DE-PS 2 214 900 for compensating for different grammages in the transverse direction of chip or fiber nonwovens or the like for the production of chipboard, fiberboard or the like proves not to be applicable here, since the lifting of the floor belt only takes place close to the floor belt local compression of the chip material without causing a change in discharge.
  • DE-B-1 093 076 in FIG. 6 shows a V-shaped distribution device in which material collecting devices can be moved into or removed from the bulk material flow over the entire width of the V-shaped metering device.
  • this distribution device it is not possible to impress a predetermined density distribution over the width of the fleece to be scattered.
  • partial quantities be removed at several points across the width of a partial flow.
  • the removal of variable partial quantities across the width of at least one partial stream shows that when the chip stream is built up from a plurality of partial streams arranged one above the other, the density distribution over the width can be influenced in accordance with a predetermined profile of the fleece.
  • a device with a chip bunker, a plurality of discharge rollers arranged one above the other, a floor conveyor, entry devices, a cover opposite the discharge rollers and a discharge opening extending over the width of the bunker is proposed, which is characterized in that several height and width adjustable suction grids predetermined width are arranged opposite the discharge rollers, and that outside of the cover a collective connection is provided for the suction.
  • This device which can also have mechanical discharge devices, such as baffles or rollers, instead of the suction proboscis, achieves a non-reactive reduction in the amount of at least one partial flow.
  • the suction proboscis are arranged in the upper half of the cover opposite the discharge rollers.
  • the suction nozzle By arranging the suction nozzle in the upper half, the local influences caused by the further partial flows are compensated for in a particularly suitable manner.
  • the suction proboscis be positioned selectively in front of the discharge rollers.
  • the selection and positioning can be electrical, mechanical, hydraulic or pneumatic as a position according to the specifications given by the manufacturer be given to the individual proboscis.
  • a storage bunker 1 which in the exemplary embodiment is designed as a floor belt bunker
  • chip material 2 to be spread is fed to the bunker via an entry device 3.
  • the entry device 3 can be designed as a scraper belt in order to attach the chip material to be loaded in each case to the chip material 2 already stored in the bunker.
  • Discharge rollers 4 cause the chip material 2 to be scattered.
  • the entire chip material content of the storage hopper 1 is advanced against the rotating discharge rollers 4, and the discharge rollers 4, which are designed as spiked rollers, mill the entire outlet cross section of the amount of chip material contained in the bunker. Partial streams 7 are thus generated over the entire spreading width of the bunker, which unite to form a chip stream 8, which leaves the bunker via a discharge opening 9 which extends over its width.
  • the discharge rollers are arranged behind a cover 10 of the bunker.
  • the chip leakage stream 8 is fed to a spreading head 11 after it emerges from the discharge opening 9, which causes, for example, the splitting of the chip leakage stream over several scattering points.
  • a conveyor belt (not shown) can be arranged as a forming belt, on which the stray current 8 is deposited as a chip fleece when the forming belt is moved.
  • FIG. 1 a is schematically shown a row of proboscis 13, which are positioned positioned across the entire width of the bunker. Extracted chip material is fed via suction hoses 20 to a collecting line 22, from which the return transport, as shown in more detail in FIG. 1, takes place to the entrance to the bunker.
  • FIG. 1b shows a faulty cross-section of a chip fleece 30 when there is no suction.
  • the elevations 31, 32, 33 are eliminated by suction through the suction nozzle 13, so that a fleece with a flat surface is formed.
  • a predeterminable surface contour 34 as shown in FIG. 1c as a raised edge of the fleece, can also be achieved.
  • the suction proboscis 13 are locked in the position once taken over a holding structure 15.
  • joints 16 and 17 and brackets 18, 19 arranged thereon it is possible to move the suction nozzle 13 and 14 along the holding structure 15 and also transversely thereto over the entire discharge cross-section, which is covered by the discharge rollers 4, and on to arrange predetermined positions locked.
  • All the proboscis 13, 14 are preferably connected to suction hoses 20, 21, which are led through an opening in the cover 10 to a collecting line 22, from which, via a further line 23, the extracted chips are returned to the storage bunker 1 by the shortest route is carried out.
  • the line 23 can consist of a pressure line, in which the conveyance is carried out with the aid of compressed air; a screw conveyor can also be provided in connection with guide surfaces.
  • guide surfaces in a predetermined dimension comparable to the suction surface of the proboscis, can also be used, which are also displaceably arranged in a corresponding manner on the holding structure 15, and their Feed partial quantities to a collecting vessel arranged on the cover, for example a screw conveyor, which is guided over the entire spreading width of the bunker.
  • This screw conveyor takes care of the removal of the partial quantities released by the individual adjustable and lockable guide surfaces.
  • the removal elements such as the suction nozzle or guide surface, are arranged in the upper half of the area of the discharge rollers 4.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
  • Absorbent Articles And Supports Therefor (AREA)

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Beeinflussung der Dichteverteilung eines zu streuenden Spänevlieses über eine Streubreite.The invention relates to a method and a device for influencing the density distribution of a chip fleece to be scattered over a scattering width.

Das Problem der gleichförmigen Streuung ist seit langem bekannt, beispielsweise wird in der DE-PS 2 214 900 eine Streuvorrichtung zum Ausgleich unterschiedlicher Flächengewichte in der Querrichtung von Späne- oder Faservliesen oder dergleichen, für die Herstellung von Spanplatten, Faserplatten oder dergleichen mit einer unterhalb der Streuvorrichtung und relativ zu dieser bewegbaren Formunterlage mit einem flexiblen über der Formunterlage angeordneten und über eine Unterlage entlanggleitenden Dosierförderband, und einer über diesem senkrecht zur Förderrichtung des Vlieses umlaufenden Rückstreifwalze oder dergleichen für auf das Dosierförderband aufgestreute Späne, Fasern oder dergleichen, wobei die Spaltbreite zwischen Dosierförderband und Rückstreifwalze über ihre Länge gesehen, verschieden ist, in Vorschlag gebracht, bei der das Dosierförderband unterhalb der Rückstreifwalze stufenlos und in Querrichtung in seiner Höhe unterschiedlich verstellbar ist. Durch diese Vorrichtung wird angestrebt, die zwischen Rückstreifwalze und Dosierförderband austretende Spänemenge, die anschliessend gestreut wird, im Hinblick auf die Flächengewichtsverteilung zu beeinflussen.The problem of uniform scattering has been known for a long time, for example in DE-PS 2 214 900 a scattering device for compensating different basis weights in the transverse direction of chip or non-woven fabrics or the like, for the production of chipboard, fiberboard or the like with a below Spreading device and relative to this movable mold base with a flexible metering conveyor belt arranged over the mold base and sliding along a base, and a stripping roller or the like running over it perpendicular to the conveying direction of the fleece for chips, fibers or the like scattered on the metering conveyor belt, the gap width between the metering conveyor belt and stripping roller seen over its length, is different, proposed in which the metering conveyor belt below the stripping roller is infinitely variable and its height adjustable in the transverse direction. The aim of this device is to influence the amount of chips emerging between the stripping roller and the metering conveyor belt, which is then scattered, with a view to the basis weight distribution.

Zufolge Steigerung in der Austragsleistung derartiger Dosierbunker, wird nunmehr der Austragsvorgang gemäss der in der DE-PS 1 084 199 offenbarten Weise durchgeführt.As a result of the increase in the discharge capacity of such dosing bunkers, the discharge process is now carried out in the manner disclosed in DE-PS 1 084 199.

Durch die übereinander angeordneten Stachelwalzen, wird das Spangut über den gesamten Querschnitt des Spänevorrats abgefräst.The chip material is milled over the entire cross-section of the chip supply due to the stacked spiked rollers.

Eine Einrichtung gemäss der DE-PS 2 214 900 zum Ausgleich unterschiedlicher Flächengewichte in Querrichtung von Späne- oder Faservliesen oder dergleichen für die Herstellung von Spanplatten, Faserplatten oder dergleichen erweist sich jedoch hier nicht anwendbar, da das Anheben des Bodenbandes lediglich zu einer nur in Bodenbandnähe wirkenden örtlichen Verdichtung des Spangutes führt, ohne eine Austragsänderung herbeizuführen.However, a device according to DE-PS 2 214 900 for compensating for different grammages in the transverse direction of chip or fiber nonwovens or the like for the production of chipboard, fiberboard or the like proves not to be applicable here, since the lifting of the floor belt only takes place close to the floor belt local compression of the chip material without causing a change in discharge.

Auch wenn heute Streumaschinen eingesetzt werden, bei denen der Austrag und das Streuen von Spanmaterial nicht mehr durch einen Schlitz zwischen Bunker und Rückstreifwalze und nachgeschalteter Abschlagswalze erfolgt, sondern über eine Kaskade von übereinander angeordneten Austragswalzen, die als Stachelwalzen ausgebildet sind, treten weiterhin systematische Fehler in dem gestreuten Vlies auf, die zu Dichtefehlern führen, auch ist es nicht möglich dem gestreuten Vlies eine vorgegebene Dichteverteilung aufzuprägen.Even if spreading machines are used today in which the discharge and spreading of chip material no longer takes place through a slot between the bunker and the stripping roller and the downstream knock-off roller, but via a cascade of discharge rollers arranged one above the other, which are designed as spiked rollers, systematic errors continue to occur the scattered fleece, which lead to density errors, it is also not possible to impress a predetermined density distribution on the scattered fleece.

So wird in der DE-B-1 093 076 in Fig. 6 eine V-förmige Verteilvorrichtung dargestellt, bei der Gutauffangvorrichtungen über die gesamte Breite der V-förmigen Dosiereinrichtung in den Schüttgutstrom einfahrbar sind oder aus diesem entfernbar sind. Es ist mit dieser Verteilvorrichtung jedoch nicht möglich, dem zu streuenden Vlies eine vorgegebene Dichteverteilung über die Breite aufzuprägen.For example, DE-B-1 093 076 in FIG. 6 shows a V-shaped distribution device in which material collecting devices can be moved into or removed from the bulk material flow over the entire width of the V-shaped metering device. With this distribution device, however, it is not possible to impress a predetermined density distribution over the width of the fleece to be scattered.

Durch die DE-A-1 728 468 ist eine Streuvorrichtung für beleimte lignozellulosehaltige Teilchen bekannt geworden. Mit Hilfe dieser Vorrichtung können Bauteile mit verschiedenem Profil wie dort in Fig. 3 dargestellt, erzeugt werden. Es ist jedoch nicht möglich, die Dichteverteilung in den einzelnen Profilstücken zu beeinflussen. Der vorliegenden Erfindung liegt demgemäss die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zur Durchführung dieses Verfahrens in Vorschlag zu bringen, mit dem das oben genannte Problem lösbar ist. Diese Aufgabe wird ausgehend von einem Stand der Technik gemäss der DE-A-2 535 382 erfindungsgemäss dadurch gelöst, dass mindestens aus einem Teilstrom über einen Teil seiner Breite entsprechend einer vorgegebenen Dichteverteilung eine sich hieraus ergebende Teilmenge aus dem Spänestrom entnommen wird. Durch die Wegnahme von Streupartikeln aus einem Teilstrom, der sich mit mehreren anderen Teilströmen kaskadenförmig zu einem Gesamtstrom vereinigt, wird in aktiver Weise die Dichteverteilung über die Streubreite eines zu streuenden Spänevlieses beeinflusst.From DE-A-1 728 468 a scattering device for glued lignocellulosic particles has become known. With the help of this device, components with different profiles as shown there in FIG. 3 can be produced. However, it is not possible to influence the density distribution in the individual profile pieces. The present invention is accordingly based on the object of proposing a method and an apparatus for carrying out this method, with which the above-mentioned problem can be solved. Starting from a state of the art according to DE-A-2 535 382, this object is achieved according to the invention in that a partial quantity resulting therefrom is taken from the chip flow at least from a partial flow over part of its width in accordance with a predetermined density distribution. By removing scattering particles from a partial stream, which cascades with several other partial streams to form a total stream, the density distribution over the scattering width of a chip fleece to be scattered is actively influenced.

Als Ausgestaltung des erfindungsgemässen Verfahrens wird vorgeschlagen, dass an mehreren Stellen über die Breite eines Teilstromes Teilmengen entnommen werden. Durch die Entnahme variabler Teilmengen über die Breite mindestens eines Teilstromes ist ersichtlich, dass bei Aufbau des Spänestromes aus mehreren übereinander angeordneten Teilströmen die Dichteverteilung über die Breite entsprechend einem vorgegebenen Profil des Vlieses beeinflusst werden kann.As an embodiment of the method according to the invention, it is proposed that partial quantities be removed at several points across the width of a partial flow. The removal of variable partial quantities across the width of at least one partial stream shows that when the chip stream is built up from a plurality of partial streams arranged one above the other, the density distribution over the width can be influenced in accordance with a predetermined profile of the fleece.

Zur Durchführung des Verfahrens wird eine Vorrichtung mit einem Spänebunker, mehreren übereinander angeordneten Austragswalzen, einem Bodenband, Eintragsvorrichtungen, einer Abdeckung gegenüber den Austragswalzen und einer über die Breite des Bunkers sich erstreckenden Austragsöffnung vorgeschlagen, die sich dadurch auszeichnet, dass mehrere höhen- und breitenverstellbare Absaugrüssei vorgegebener Breite gegenüber den Austragswalzen angeordnet sind, und dass ausserhalb der Abdeckung ein Sammelanschluss für die Absaugung vorgesehen ist. Durch diese Vorrichtung, die auch anstelle der Saugrüssel mechanische Ableitvorrichtungen besitzen kann, wie Leitbleche oder Walzen, wird eine rückwirkungsfreie Reduzierung der Menge mindestens eines Teilstromes erreicht.To carry out the method, a device with a chip bunker, a plurality of discharge rollers arranged one above the other, a floor conveyor, entry devices, a cover opposite the discharge rollers and a discharge opening extending over the width of the bunker is proposed, which is characterized in that several height and width adjustable suction grids predetermined width are arranged opposite the discharge rollers, and that outside of the cover a collective connection is provided for the suction. This device, which can also have mechanical discharge devices, such as baffles or rollers, instead of the suction proboscis, achieves a non-reactive reduction in the amount of at least one partial flow.

Als eine weitere Ausgestaltung des Erfindungsgegenstandes wird es angesehen, dass die Absaugrüssel in der oberen Hälfte der Abdeckung gegenüber den Austragswalzen angeordnet sind. Durch Anordnen der Absaugrüssel in der oberen Hälfte, werden die örtlich auftretenden Beeinflussungen durch die weiteren Teilströme in besonders geeigneter Weise ausgeglichen.As a further embodiment of the subject matter of the invention, it is considered that the suction proboscis are arranged in the upper half of the cover opposite the discharge rollers. By arranging the suction nozzle in the upper half, the local influences caused by the further partial flows are compensated for in a particularly suitable manner.

In noch weiterer Ausgestaltung des Erfindungsgegenstandes wird vorgeschlagen, dass in Abhängigkeit einer vorgegebenen Dichteverteilung über die Breite eines Spänevlieses die Absaugrüssel vor den Austragswalzen ausgewählt positioniert werden. Die Auswahl und Positionierung kann entpsrechend der vom Hersteller gegebenen Vorgaben elektrisch, mechanisch, hydraulisch oder pneumatisch als Positionierungsbefehl an die einzelnen Saugrüssel gegeben werden.In yet another embodiment of the subject matter of the invention, it is proposed that, depending on a predetermined density distribution across the width of a chip fleece, the suction proboscis be positioned selectively in front of the discharge rollers. The selection and positioning can be electrical, mechanical, hydraulic or pneumatic as a position according to the specifications given by the manufacturer be given to the individual proboscis.

In der nachfolgenden Zeichnung wird die Erfindung näher erläutert.The invention is explained in more detail in the following drawing.

Es zeigen:

  • Fig. 1 einen Querschnitt durch eine erfindungsgemässe Anordnung;
  • Fig. 1 eine Saugrüsselanordnung an einer Austragswalze;
  • Fig. 1 b, 1 c entsprechende Vliesquerschnitte.
Show it:
  • 1 shows a cross section through an arrangement according to the invention.
  • 1 shows a suction nozzle arrangement on a discharge roller;
  • Fig. 1 b, 1 c corresponding fleece cross sections.

In einem Vorratsbunker 1, der im Ausführungsbeispiel als Bodenbandbunker ausgebildet ist, wird zu streuendes Spanmaterial 2 über eine Eintragsvorrichtung 3 dem Bunker zugeführt. Die Eintragsvorrichtung 3 kann als Kratzerband ausgebildet sein, um das jeweils einzutragende Spanmaterial an das bereits im Bunker eingelagerte Spanmaterial 2 anzulagern. Austragswalzen 4 bewirken ein Austragen von zu streuendem Spanmaterial 2. Durch Umlauf eines Bodenbandes 5 in Pfeilrichtung 6, wird der gesamte Spanmaterialinhalt des Vorratsbunkers 1 gegen die rotierenden Austragswalzen 4 vorgeschoben, und die Austragswalzen 4, die als Stachelwalzen ausgebildet sind, fräsen den gesamten Austrittsquerschnitt der im Bunker enthaltenen Spanmaterialmenge ab. Damit werden Teilströme 7 über die gesamte Streubreite des Bunkers erzeugt, die zu einem Spänestrom 8 sich vereinigen, der den Bunker über eine über seine Breite sich erstreckenden Austragsöffnung 9 verlässt. Die Austragswalzen sind hinter einer Abdeckung 10 des Bunkers angeordnet.In a storage bunker 1, which in the exemplary embodiment is designed as a floor belt bunker, chip material 2 to be spread is fed to the bunker via an entry device 3. The entry device 3 can be designed as a scraper belt in order to attach the chip material to be loaded in each case to the chip material 2 already stored in the bunker. Discharge rollers 4 cause the chip material 2 to be scattered. By rotating a floor conveyor 5 in the direction of the arrow 6, the entire chip material content of the storage hopper 1 is advanced against the rotating discharge rollers 4, and the discharge rollers 4, which are designed as spiked rollers, mill the entire outlet cross section of the amount of chip material contained in the bunker. Partial streams 7 are thus generated over the entire spreading width of the bunker, which unite to form a chip stream 8, which leaves the bunker via a discharge opening 9 which extends over its width. The discharge rollers are arranged behind a cover 10 of the bunker.

Der Spänestreustrom 8 wird nach seinem Austritt aus der Austragsöffnung 9 einem Streukopf 11 zugeführt, der beispielsweise die Aufteilung des Spänestreustromes auf mehrere Streustellen bewirkt. Es kann jedoch auch bereits anstelle des Streukopfes 11 ein nicht dargestelltes Förderband als Formband angeordnet sein, auf dem der Streustrom 8 bei Bewegung des Formbandes als Spänevlies abgelegt wird.The chip leakage stream 8 is fed to a spreading head 11 after it emerges from the discharge opening 9, which causes, for example, the splitting of the chip leakage stream over several scattering points. However, instead of the spreading head 11, a conveyor belt (not shown) can be arranged as a forming belt, on which the stray current 8 is deposited as a chip fleece when the forming belt is moved.

Zwischen Abdeckung 10 und Austragswalzen 4 sind Reihen von Saugrüsseln 13 bzw. 14 vorgesehen, die eine bestimmte vorgegebenen Saugfläche besitzen. In Fig. 1 a ist schematisch eine Reihe von Saugrüsseln 13 dargestellt, die positioniert über die gesamte Breite des Bunkers angeordnet sind. Über Saugschläuche 20 wird abgesaugtes Spanmaterial einer Sammelleitung 22 zugeführt, von der aus der Rücktransport, wie in Fig. 1 näher dargestellt, zum Bunkereintritt erfolgt.Between cover 10 and discharge rollers 4, rows of suction probes 13 and 14 are provided, which have a certain predetermined suction surface. In Fig. 1 a is schematically shown a row of proboscis 13, which are positioned positioned across the entire width of the bunker. Extracted chip material is fed via suction hoses 20 to a collecting line 22, from which the return transport, as shown in more detail in FIG. 1, takes place to the entrance to the bunker.

Fig. 1 b stellt einen fehlerhaften Querschnitt eines Spänevlieses 30 dar, wenn keine Absaugung erfolgt. Durch die Absaugung über die Saugrüssel 13 werden die Erhöhungen 31, 32, 33 beseitigt, so dass ein Vlies mit ebener Oberfläche entsteht. Durch erhöhte Abnahme von Spanmaterial über die Saugrüssel 13, ist auch eine vorgebbare Oberflächenkontur 34, wie in Fig. 1c als Randüberhöhung des Vlieses dargestellt, erreichbar.1b shows a faulty cross-section of a chip fleece 30 when there is no suction. The elevations 31, 32, 33 are eliminated by suction through the suction nozzle 13, so that a fleece with a flat surface is formed. By increasing the removal of chip material via the suction nozzle 13, a predeterminable surface contour 34, as shown in FIG. 1c as a raised edge of the fleece, can also be achieved.

Die Saugrüssel 13 werden über eine Haltekonstruktion 15 in der einmal eingenommenen Lage arretiert. Durch Gelenke 16 bzw. 17 und daran angeordneten Halterungen 18, 19 ist es möglich, die Saugrüssel 13 bzw. 14 entlang der Haltekonstruktion 15 und auch quer zu dieser über den gesamten Austragsquerschnitt, der von den Austragswalzen 4 abgedeckt wird, positioniert zu verschieben und an vorgegebenen Stellen arretiert anzuordnen. Alle Saugrüssel 13, 14 sind vorzugsweise mit Saugschläuchen 20, 21 verbunden, die durch eine Öffnung in der Abdeckung 10 zu einer Sammelleitung 22 geführt sind, von der aus über eine weitere Leitung 23 ein Rücktransport der abgesaugten Spänemengen in den Vorratsbunker 1 auf dem kürzesten Wege durchgeführt wird. Die Leitung 23 kann aus einer Druckleitung bestehen, in der mit Hilfe von Druckluft die Förderung durchgeführt wird, es kann auch in Verbindung mit Leitflächen ein Schneckenförderer vorgesehen sein.The suction proboscis 13 are locked in the position once taken over a holding structure 15. By means of joints 16 and 17 and brackets 18, 19 arranged thereon, it is possible to move the suction nozzle 13 and 14 along the holding structure 15 and also transversely thereto over the entire discharge cross-section, which is covered by the discharge rollers 4, and on to arrange predetermined positions locked. All the proboscis 13, 14 are preferably connected to suction hoses 20, 21, which are led through an opening in the cover 10 to a collecting line 22, from which, via a further line 23, the extracted chips are returned to the storage bunker 1 by the shortest route is carried out. The line 23 can consist of a pressure line, in which the conveyance is carried out with the aid of compressed air; a screw conveyor can also be provided in connection with guide surfaces.

Anstelle der Saugrüssel 13, 14, die an ein nicht dargestelltes Unterdruck erzeugendes System angeschlossen sind, können auch Leitflächen in vorgegebener Abmessung, vergleichbar der Saugfläche der Saugrüssel, verwendet werden, die in entsprechender Weise ebenfalls verschiebbar an der Haltekonstruktion 15 angeordnet sind, und die ihre Teilmengen einem an der Abdeckung angeordneten Sammelgefäss zuführen, beispielsweise einem Schneckenförderer, der über die gesamte Streubreite des Bunkers geführt ist. Dieser Schneckenförderer übernimmt den Abtransport der von den einzelnen verstell- und arretierbaren Leitflächen abgegebenen Teilmengen.Instead of the proboscis 13, 14, which are connected to a vacuum system not shown, guide surfaces in a predetermined dimension, comparable to the suction surface of the proboscis, can also be used, which are also displaceably arranged in a corresponding manner on the holding structure 15, and their Feed partial quantities to a collecting vessel arranged on the cover, for example a screw conveyor, which is guided over the entire spreading width of the bunker. This screw conveyor takes care of the removal of the partial quantities released by the individual adjustable and lockable guide surfaces.

Wie in Fig. dargestellt ist, ist es besonders im Hinblick auf die Vergleichmässigung besonders zweckmässig, wenn die Abnahmeorgane, wie Saugrüssel oder Leitfläche, in der oberen Hälfte des Bereichs der Austragswalzen 4 angeordnet sind.As shown in FIG. 1, it is particularly expedient, particularly with regard to the homogenization, if the removal elements, such as the suction nozzle or guide surface, are arranged in the upper half of the area of the discharge rollers 4.

Claims (5)

1. A method of controlling the distribution of density of a fleece to be spread, over its width of spread, with a stream of chips (8) consisting of a plurality of component streams (7), characterised in that a component amount is extracted from the stream of chips (8) from at least one component stream (7) over a portion of tis width corresponding to a predetermined distribution of density, the component amount being a function thereof.
2. A method according to Claim 1, characterised in that component amounts are extracted at a plurality of points over the width of a component stream (7).
3. An apparatus for carrying out the method according to Claim 1 or 2 having a chip bin (1), a plurality of discharge rollers (4) disposed one above the other, a bottom belt (5), feed devices (3), a cover (10) facing the discharge rollers (4) and a discharge opening (9) extending over the width of the bin, characterised in that a plurality of suction nozzles (13, 14) of predetermined width, which are adjustable in height and laterally, are disposed facing the discharge rollers (4) and that a central connection (22) for the suction is provided outside the cover (10).
4. An apparatus according to Claim 3, characterised in thatthe suction nozzles (13, 14) are disposed in the upper half of the cover (10) facing the discharge rollers (4).
5. An apparatus according to Claim 3 or 4, characterised in that for the positioning of the suction nozzles (13, 14) depending on a predetermined distribution of density over the width of a fleece (31), the suction nozzles (13, 14) are selectively positioned in front of the discharge rollers (4).
EP81105215A 1981-07-04 1981-07-04 Method and apparatus for controlling the density distribution of a dispersed particle mat Expired EP0069162B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE8181105215T DE3170270D1 (en) 1981-07-04 1981-07-04 Method and apparatus for controlling the density distribution of a dispersed particle mat
EP81105215A EP0069162B1 (en) 1981-07-04 1981-07-04 Method and apparatus for controlling the density distribution of a dispersed particle mat
FI820641A FI73912C (en) 1981-07-04 1982-02-25 Method and apparatus for affecting the spreading density of a spreadable chip layer
US06/392,334 US4504182A (en) 1981-07-04 1982-06-28 Procedure for controlling the density distribution of wood chips and device therefor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP81105215A EP0069162B1 (en) 1981-07-04 1981-07-04 Method and apparatus for controlling the density distribution of a dispersed particle mat

Publications (2)

Publication Number Publication Date
EP0069162A1 EP0069162A1 (en) 1983-01-12
EP0069162B1 true EP0069162B1 (en) 1985-05-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP81105215A Expired EP0069162B1 (en) 1981-07-04 1981-07-04 Method and apparatus for controlling the density distribution of a dispersed particle mat

Country Status (4)

Country Link
US (1) US4504182A (en)
EP (1) EP0069162B1 (en)
DE (1) DE3170270D1 (en)
FI (1) FI73912C (en)

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DE102006030122A1 (en) * 2006-06-28 2008-01-03 Siempelkamp Maschinen- Und Anlagenbau Gmbh & Co. Kg Scattering material installation especially for wood chips and wood fibers, uses drop shaft for generating air streams for influencing scattering material distribution over given width
DE102018112166A1 (en) * 2018-05-22 2019-11-28 Dieffenbacher GmbH Maschinen- und Anlagenbau Apparatus and method for scattering a web on a forming belt

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EP0161323A1 (en) * 1984-04-16 1985-11-21 Bison-Werke Bähre & Greten GmbH & Co. KG Method of and apparatus for obtaining a predetermined weight per unit area in a fibre layer
CA1236813A (en) * 1984-04-16 1988-05-17 Wolfgang Heller Method of and apparatus for obtaining a predeterminable distribution of weight in the transverse direction of a pre-mat and/or mat
DE3468365D1 (en) * 1984-04-16 1988-02-11 Baehre & Greten Method of and apparatus for obtaining a predetermined weight per unit area in a first fibre layer
US4838750A (en) * 1985-09-13 1989-06-13 Henley Burrowes & Company Limited Storage bunker
DE3669838D1 (en) * 1986-01-20 1990-05-03 Schenck Ag Carl METHOD FOR COMPARISONING SPREADING PARTICLES, AND A DEVICE FOR IMPLEMENTING THE METHOD.
DE3766247D1 (en) * 1987-05-23 1990-12-20 Schenck Ag Carl METHOD FOR SPREADING A CHIP FLEECE
US5176295A (en) * 1990-03-13 1993-01-05 Beloit Technologies, Inc. Discharge apparatus for bins
CH683406A5 (en) * 1991-03-26 1994-03-15 Matec Holding Method and apparatus for producing a fibrous molding.
CN103753686B (en) * 2013-12-24 2015-12-09 上海人造板机器厂有限公司 A kind of throwing roller arrangement with the spreading machine of adjustable damper
DE202018102823U1 (en) 2018-05-22 2019-08-26 Dieffenbacher GmbH Maschinen- und Anlagenbau Device for scattering a fleece on a forming belt
CN110127325B (en) * 2019-04-15 2020-12-01 洪湖市金叶烟草机械有限公司 Storage cabinet discharging speed control method and system

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DE1728468A1 (en) * 1965-04-15 1972-12-28 Werz Furnier Sperrholz Scattering device for glued lignocellulosic particles
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Publication number Priority date Publication date Assignee Title
DE102006030122A1 (en) * 2006-06-28 2008-01-03 Siempelkamp Maschinen- Und Anlagenbau Gmbh & Co. Kg Scattering material installation especially for wood chips and wood fibers, uses drop shaft for generating air streams for influencing scattering material distribution over given width
DE102006030122B4 (en) * 2006-06-28 2008-05-21 Siempelkamp Maschinen- Und Anlagenbau Gmbh & Co. Kg The scattering material plant
DE102018112166A1 (en) * 2018-05-22 2019-11-28 Dieffenbacher GmbH Maschinen- und Anlagenbau Apparatus and method for scattering a web on a forming belt

Also Published As

Publication number Publication date
EP0069162A1 (en) 1983-01-12
FI73912C (en) 1987-12-10
DE3170270D1 (en) 1985-06-05
FI73912B (en) 1987-08-31
US4504182A (en) 1985-03-12

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