EP0511425B1 - Device for continously laying a fibrous, felted mat - Google Patents

Device for continously laying a fibrous, felted mat Download PDF

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Publication number
EP0511425B1
EP0511425B1 EP19910107012 EP91107012A EP0511425B1 EP 0511425 B1 EP0511425 B1 EP 0511425B1 EP 19910107012 EP19910107012 EP 19910107012 EP 91107012 A EP91107012 A EP 91107012A EP 0511425 B1 EP0511425 B1 EP 0511425B1
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EP
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Prior art keywords
band
belt
intermediate band
moulding belt
scattering
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EP19910107012
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German (de)
French (fr)
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EP0511425A1 (en
Inventor
Uwe Kunstmann
Walter Henschel
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Carl Schenck AG
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Carl Schenck AG
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Priority to EP19910107012 priority Critical patent/EP0511425B1/en
Priority to DE59106627T priority patent/DE59106627D1/en
Publication of EP0511425A1 publication Critical patent/EP0511425A1/en
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Publication of EP0511425B1 publication Critical patent/EP0511425B1/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

Definitions

  • the invention relates to a device for the continuous application of a layer of grit from a storage bunker to a forming belt, the grit being divided into several fractions of different particle sizes before being deposited on the forming belt.
  • Such devices are used, for example, in chipboard plants for spreading the top layers with glued wood chips, since a good surface quality can only be achieved if the outside of the chipboard consists of the finest possible grit.
  • a wind sifting ensures the separation of the grit according to its particle size.
  • the spreading material is poured from above into a spreading chamber in which a fan ensures a horizontal air flow.
  • a disadvantage of the known scattering device is the formation of eddies which can occur in the scattering chamber if no special fluidic measures are taken and which then impair the separation efficiency.
  • the fleece that has already been poured onto the forming belt is affected by the wind conditions in the scattering chamber, which can lead to irregularities both in the layer thickness and in the fleece structure.
  • the known arrangement is very complex in terms of structure and space requirements due to the wind generating device required and the structural measures for flow guidance.
  • a spreading device is known from DE-AS 24 22 487 in which the spreading material is thrown into a spreading chamber by means of a conveyor belt, through which the forming belt runs.
  • a blower is arranged in the scattering chamber, which generates an air flow which is directed in the opposite direction to the conveying direction of the conveyor belt.
  • the invention is therefore based on the object of creating a generic device for the continuous application of a layer of spreading material, which is characterized by a simple and easily controllable structure, allows optimal division of even the finest material into fractions of different particle sizes and requires the smallest possible space. This object is achieved by the characterizing features of claim 1.
  • the solution according to the invention pulls the material stream coming out of the bunker apart, accelerates it and gives each particle a defined speed and direction of movement.
  • the separation of the spreading material into fractions of different particle sizes is achieved by the air resistance, which acts on the individual mass particles after being thrown into a scattering chamber that does not flow through.
  • This effect of the air resistance on the particles is favored in a preferred embodiment of the invention in that the belt speed of the intermediate belt is selected such that the scattering material particles are separated on the intermediate belt.
  • DE-AS 12 05 274 Although a scattering device for wood chips is known from DE-AS 12 05 274, in which a throwing roller is intended to separate the chips according to their size, this separation takes place in that differently sized particles are forced at different speeds. The influence of air resistance is negligible in this process.
  • the spreading device according to DE-AS 12 05 274 is therefore only suitable for the scattering of relatively coarse material and not for the production of cover layers. With the object according to the invention, however, in particular very fine, even dust-like material flows can be scattered in a controlled manner.
  • a very good separation effect can be achieved if the intermediate belt speed is at least five times higher than the rotating speed of the forming belt.
  • a particularly favorable operating range is between 5 and 15 times the speed.
  • a circulating sieve is arranged in the discharge area between the forming belt and the intermediate belt.
  • This circulating sieve can be designed as a bar or grating, as a wire mesh belt or the like.
  • Another preferred embodiment of the invention provides at least one grit removal device that can be moved into the discharge area.
  • These grit removal devices can be designed, for example, as slide-in plates or conveying devices which can be displaced along the longitudinal axis of the forming belt.
  • the quantity and the composition in relation to the particle size of the spreading material deposited on the forming belt can be influenced by the spreading material removal devices.
  • the removal devices are arranged directly in the vicinity of the circulating sieve, since then spreading material collected by the circulating sieve can be removed by means of the removal device.
  • an end surface is provided, the position of which can be adjusted relative to the intermediate belt.
  • This end surface can be a rigid surface with a defined shape; however, it can also be formed by a circumferential band.
  • Both this circulating belt and the intermediate belt can have a profiled surface, on the one hand to promote the entrainment of grit particles and on the other hand to improve the build-up of an air flow.
  • At least one spreading roller is arranged in the discharge area of the spreading material, which brakes the spreading material thrown off the intermediate belt before it hits the forming belt.
  • the single figure shows a scattering station for top layers of chipboard, the chips being brought from a storage bunker 1 into the scattering chamber 3 in metered fashion by means of a conveyor roller device 2. There, a horizontal component of motion is forced on the chip material by the spreader roller 4 and the chute 5. After leaving the slide 5, the chip is on the rapidly rotating Intermediate belt 6 deposited, and dropped at the end of the conveyor onto the forming belt 7, the belt speed is significantly lower.
  • the layer height of the spreading material deposited on the forming belt is determined by coordinating the forming belt speed and the conveying quantity of the conveying roller device 2 with one another. Since the belt speed of the intermediate belt 6 is many times, for example a power of ten, higher than the belt speed of the forming belt 7, the bulk material flow on the intermediate belt 6 is pulled apart very strongly. It has been shown that a particularly good separation efficiency is achieved in fractions of certain chip sizes if the belt speed of the intermediate belt 6 is so high that the chips are separated on the intermediate belt.
  • All chips leave the intermediate belt 6 at the discharge point with the same speed and direction of movement.
  • the separation of the chips is caused by the air resistance to which each particle in the still air of the scattering chamber 3 is exposed, and which ensures that the throw of a large chip is larger than that of a small chip.
  • an upper or lower covering layer of a particle board can now be sprinkled.
  • a circulating sieve 8 crosses the discharge area of the spreading material.
  • the circulating sieve 8 brings about braking and leveling of the spreading material before depositing.
  • it is designed as a bar grate and transports collected material into the collecting space 9.
  • the other end of the circulating sieve 8 projects into a further collecting space, in which there is a brush roller 10, which serves to clean the circulating sieve 8.
  • the circulation sieve 8 has in addition to the sieving effect the additional effect that there are air vortices that may be caused by the fast-running Intermediate belt 6 are generated, keeps away from the forming belt 7.
  • a plurality of material removal devices designed as slides 11 are arranged distributed over the belt width and can be moved horizontally into the discharge area of the spreading material. Each slide can be moved individually so that an uneven distribution of spreading material over the spreading width can be counteracted. In addition, depending on how far they are pushed into the discharge area, the entire layer thickness of the chip fleece can of course be determined by the removal devices.
  • the removal devices are arranged so that they are located in the discharge area facing away from the intermediate belt 6, so that primarily coarse grit material is removed. For the removal of the spreading material removed by the slides 11, the part of the slider 11 facing away from the discharge area is formed in a channel-shaped manner so that the particles can be picked up here.
  • a plurality of spreading rollers 12 are arranged, which brake the spreading material before being deposited on the forming belt 7, so that mixing of the individual fractions is avoided.
  • These spreading rollers 12 are provided with curved receiving arms, so that the individual particles are "damped" and then placed on the forming belt 7.
  • a cover belt 13 is provided, which is designed as an essentially L-shaped continuous belt.
  • the flow within the air gap between the intermediate belt 6 and the cover belt 13 can be adjusted within a wide range by displacing individual bearing rolls of the cover band 13, in particular the bearing roll 14.
  • the shroud 13 experiences its strongest deflection on the bearing roller 15, which is in an area above the slider 11 Scattering chamber 3 is arranged. As a result, any spreading material adhering to the cover band 13 is thrown off at a point from which it can no longer reach the forming band 7.
  • the cleaning roller 16 is also provided in the region of the bearing roller 15, so that the band region of the cover band 13 facing the intermediate band 6 is always free of deposits.
  • Another cleaning roller 17 is assigned to the run of the intermediate belt 6 facing away from the shroud 13.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zum kontinuierlichen Aufbringen einer Streugutschicht aus einem Vorratsbunker auf ein Formband, wobei das Streugut vor der Ablage auf dem Formband in mehrere Fraktionen unterschiedlicher Partikelgröße aufgeteilt wird.The invention relates to a device for the continuous application of a layer of grit from a storage bunker to a forming belt, the grit being divided into several fractions of different particle sizes before being deposited on the forming belt.

Solche Vorrichtungen werden beispielsweise in Spanplattenanlagen zum Streuen der Deckschichten mit beleimten Holzspänen verwendet, da eine gute Oberflächenqualität nur erreichbar ist, wenn die Außenseite der Spanplatte aus möglichst feinkörnigem Streugut besteht. Eine derartige Vorrichtung ist aus der DE-OS 27 42 566 bekannt, wobei gemäß dieser Vorrichtung eine Windsichtung für die Separierung des Streugutes entsprechend seiner Partikelgröße sorgt. Hierzu wird das Streugut von oben in eine Streukammer geschüttet, in welcher ein Gebläse für eine waagerechte Luftströmung sorgt. Nachteilig bei der bekannten Streuvorrichtung ist die Wirbelbildung, die in der Streukammer auftreten kann, wenn nicht spezielle strömungstechnische Maßnahmen getroffen werden, und die dann den Separationswirkungsgrad beeinträchtigt. Darüber hinaus wird auch das bereits auf das Formband aufgeschüttete Vlies von den Windverhältnissen in der Streukammer tangiert, was zu Unregelmäßigkeiten sowohl in der Schichtstärke als auch in der Vliesstruktur führen kann. Die bekannte Anordnung ist durch die benötigte Winderzeugungseinrichtung und die baulichen Maßnahmen zur Strömungsführung sehr aufwendig in Bezug auf den Aufbau und den Raumbedarf. Darüber hinaus besteht bei den Windsichtungsstationen die Gefahr, daß sich an bestimmten Stellen des Streukammergehäuses Streugutansammlungen bilden, die einer Erschütterung auf das Formband herabfallen, wodurch der Betrieb der Anlage erheblich gestört werden kann.Such devices are used, for example, in chipboard plants for spreading the top layers with glued wood chips, since a good surface quality can only be achieved if the outside of the chipboard consists of the finest possible grit. Such a device is known from DE-OS 27 42 566, wherein according to this device a wind sifting ensures the separation of the grit according to its particle size. For this purpose, the spreading material is poured from above into a spreading chamber in which a fan ensures a horizontal air flow. A disadvantage of the known scattering device is the formation of eddies which can occur in the scattering chamber if no special fluidic measures are taken and which then impair the separation efficiency. In addition, the fleece that has already been poured onto the forming belt is affected by the wind conditions in the scattering chamber, which can lead to irregularities both in the layer thickness and in the fleece structure. The known arrangement is very complex in terms of structure and space requirements due to the wind generating device required and the structural measures for flow guidance. In addition, there is a risk at the wind sifting stations that accumulations of grit form at certain points in the scattering chamber housing a shock fall on the forming belt, which can significantly disrupt the operation of the system.

Aus der DE-AS 24 22 487 ist eine Streueinrichtung bekannt, bei welcher das Streugut mittels eines Förderbandes in eine Streukammer geworfen wird, durch die das Formband verläuft. Dabei ist in der Streukammer ein Gebläse angeordnet, das eine Luftströmung erzeugt, die der Förderrichtung des Förderbandes entgegengerichtet ist, somit erfolgt bei dieser bekannten Streuvorrichtung im wesentlichen eine Windrichtung, die mit den oben erläuterten Nachteilen verbunden ist. Das Wurfstreuen dient in der genannten Streuvorrichtung lediglich der Erhöhung der Durchsatzleistung.A spreading device is known from DE-AS 24 22 487 in which the spreading material is thrown into a spreading chamber by means of a conveyor belt, through which the forming belt runs. In this case, a blower is arranged in the scattering chamber, which generates an air flow which is directed in the opposite direction to the conveying direction of the conveyor belt. Thus, in this known scattering device there is essentially a wind direction which is associated with the disadvantages explained above. Throwing spreading is only used in the spreading device mentioned to increase the throughput.

Der Erfindung liegt daher die Aufgabe zugrunde, eine gattungsgemäße Vorrichtung zum kontinuierlichen Aufbringen einer Streugutschicht zu schaffen, die sich durch einen einfachen und leicht regelbaren Aufbau auszeichnet, ein optimales Aufteilen auch feinsten Materials in Fraktionen unterschiedlicher Partikelgrößen erlaubt und dabei einen möglichst geringen Bauraum benötigt. Diese Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale des Anspruches 1 gelöst.The invention is therefore based on the object of creating a generic device for the continuous application of a layer of spreading material, which is characterized by a simple and easily controllable structure, allows optimal division of even the finest material into fractions of different particle sizes and requires the smallest possible space. This object is achieved by the characterizing features of claim 1.

Durch die erfindungsgemäße Lösung wird der aus dem Bunker kommende Materialstrom auseinandergezogen, beschleunigt und jedem Partikel eine definierte Geschwindigkeit und Bewegungsrichtung erteilt. Die Separierung des Streugutes in Fraktionen unterschiedlicher Partikelgröße wird durch den Luftwiderstand erreicht, der nach dem Abwurf in eine Streukammer, die nicht durchströmt ist, auf die einzelnen Massenteilchen einwirkt.The solution according to the invention pulls the material stream coming out of the bunker apart, accelerates it and gives each particle a defined speed and direction of movement. The separation of the spreading material into fractions of different particle sizes is achieved by the air resistance, which acts on the individual mass particles after being thrown into a scattering chamber that does not flow through.

Dieses Einwirken des Luftwiderstandes auf die Teilchen wird bei einer bevorzugten Ausführungsform der Erfindung dadurch begünstigt, daß die Bandgeschwindigkeit des Zwischenbandes so gewählt ist, daß die Streugutpartikel auf dem Zwischenband vereinzelt werden.This effect of the air resistance on the particles is favored in a preferred embodiment of the invention in that the belt speed of the intermediate belt is selected such that the scattering material particles are separated on the intermediate belt.

Zwar ist aus der DE-AS 12 05 274 eine Streuvorrichtung für Holzspäne bekannt, bei der eine Wurfwalze die Trennung der Späne nach ihrer Größe bewirken soll, jedoch erfolgt diese Trennung dadurch, daß den unterschiedlich großen Partikeln unterschiedlich große Geschwindigkeiten aufgezwungen werden. Der Einfluß des Luftwiderstandes ist bei diesem Verfahren unwesentlich. Die Streuvorrichtung gemäß der DE-AS 12 05 274 ist daher auch nur für die Streuung von relativ grobem Material und nicht für die Erzeugung von Deckschichten geeignet. Mit dem erfindungsgemäßen Gegenstand jedoch lassen sich insbesondere sehr feine, sogar staubförmige Materialströme kontrolliert streuen.Although a scattering device for wood chips is known from DE-AS 12 05 274, in which a throwing roller is intended to separate the chips according to their size, this separation takes place in that differently sized particles are forced at different speeds. The influence of air resistance is negligible in this process. The spreading device according to DE-AS 12 05 274 is therefore only suitable for the scattering of relatively coarse material and not for the production of cover layers. With the object according to the invention, however, in particular very fine, even dust-like material flows can be scattered in a controlled manner.

Eine sehr gute Saparierungswirkung läßt sich erzielen, wenn die Zwischenbandgeschwindigkeit mindestens fünfmal höher ist als die Umlaufgeschwindigkeit des Formbandes. Ein besonders günstiger Betriebsbereich liegt zwischen der 5- und 15-fachen Geschwindigkeit.A very good separation effect can be achieved if the intermediate belt speed is at least five times higher than the rotating speed of the forming belt. A particularly favorable operating range is between 5 and 15 times the speed.

Um unerwünscht große Streugutteile oder Teilchenzusammenschlüsse vom Formband fernzuhalten, ist vorgesehen, daß im Abwurfbereich zwischen dem Formband und dem Zwischenband ein Umlaufsieb angeordnet ist. Dieses Umlaufsieb kann als Stab- oder Gitterrost, als Drahtflechtgurt oder dergleichen ausgebildet sein.In order to keep undesirably large grit or particle aggregates away from the forming belt, it is provided that a circulating sieve is arranged in the discharge area between the forming belt and the intermediate belt. This circulating sieve can be designed as a bar or grating, as a wire mesh belt or the like.

Eine weitere bevorzugte Ausführungsform der Erfindung sieht mindestens eine in den Abwurfbereich bewegbare Streugutentnahmevorrichtung vor. Diese Streugutentnahmevorrichtungen können beispielsweise als Einschubbleche oder Fördereinrichtungen ausgebildet sein, die entlang der Längsachse des Formbandes verschiebbar sind, ausgebildet sein. Durch die Streugutentnahmevorrichtungen kann die Menge und die Zusammensetzung in Bezug auf die Partikelgröße des auf das Formband abgelegten Streugutes beeinflußt werden.Another preferred embodiment of the invention provides at least one grit removal device that can be moved into the discharge area. These grit removal devices can be designed, for example, as slide-in plates or conveying devices which can be displaced along the longitudinal axis of the forming belt. The quantity and the composition in relation to the particle size of the spreading material deposited on the forming belt can be influenced by the spreading material removal devices.

Besonders günstig ist es, wenn die Entnahmevorrichtungen unmittelbar in der Nähe des Umlaufsiebes angeordnet sind, da dann von dem Umlaufsieb aufgefangenes Streugut mittels der Entnahmevorrichtung abtransportiert werden kann.It is particularly favorable if the removal devices are arranged directly in the vicinity of the circulating sieve, since then spreading material collected by the circulating sieve can be removed by means of the removal device.

Zur Steuerung der Schichtstärke quer zur Förderrichtung des Formbandes ist vorgesehen, daß über die gesamte Streubreite mehrere, unabhängig voneinander verschiebbare Entnahmevorrichtungen angeordnet sind, die in Abhängigkeit von der von einer Meßstation ermittelten Mengenverteilung des Streugutes über die Formbandbreite betätigt werden. Zur Beeinflussung der Luftströmungsverhältnisse in der Streukammer und im Bereich des Zwischenbandes, ist eine Abschlußfläche vorgesehen, deren Lage relativ zum Zwischenband einstellbar ist. Diese Abschlußfläche kann eine starre Fläche mit deffinierter Form sein; sie kann jedoch auch durch ein umlaufendes Band gebildet werden. Sowohl dieses Umlaufband, als auch das Zwischenband kann eine profilierte Oberfläche aufweisen, um zum einen die Mitnahme von Streugutpartikeln zu begünstigen und zum anderen den Aufbau einer Luftströmung zu verbessern.To control the layer thickness transversely to the conveying direction of the forming belt, provision is made for several, independently displaceable removal devices to be arranged over the entire spreading width, which are actuated as a function of the quantity distribution of the spreading material determined by a measuring station over the forming band width. To influence the air flow conditions in the scattering chamber and in the area of the intermediate belt, an end surface is provided, the position of which can be adjusted relative to the intermediate belt. This end surface can be a rigid surface with a defined shape; however, it can also be formed by a circumferential band. Both this circulating belt and the intermediate belt can have a profiled surface, on the one hand to promote the entrainment of grit particles and on the other hand to improve the build-up of an air flow.

Um ein Vermischen der separierten Streugutfraktionen während der Ablage auf dem Formband zu vermeiden, ist mindestens eine Streuwalze im Abwurfbereich des Streugutes angeordnet, welche das vom Zwischenband abgeworfene Streugut vor dem Auftreffen auf das Formband abbremst.In order to avoid mixing of the separated scattering material fractions during depositing on the forming belt, at least one spreading roller is arranged in the discharge area of the spreading material, which brakes the spreading material thrown off the intermediate belt before it hits the forming belt.

Weitere vorteilhafte Merkmale sowie die Funktion der Erfindung ergeben sich aus der nachstehenden Beschreibung eines Ausführungsbeispiels anhand der Zeichnung.Further advantageous features and the function of the invention result from the following description of an embodiment with reference to the drawing.

Die einzige Figur zeigt eine Streustation für Deckschichten von Spanplatten, wobei die Späne aus einem Vorratsbunker 1 mittels einer Förderwalzeneinrichtung 2 dosiert in die Streukammer 3 gebracht werden. Dort wird dem Spangut durch die Streuwalze 4 und die Rutsche 5 eine horizontale Bewegungskomponente aufgezwungen. Nach Verlassen der Rutsche 5 wird das Spangut auf dem schnell umlaufenden Zwischenband 6 abgelegt, und am Ende der Förderstrecke auf das Formband 7 abgeworfen, dessen Bandgeschwindigkeit wesentlich geringer ist.The single figure shows a scattering station for top layers of chipboard, the chips being brought from a storage bunker 1 into the scattering chamber 3 in metered fashion by means of a conveyor roller device 2. There, a horizontal component of motion is forced on the chip material by the spreader roller 4 and the chute 5. After leaving the slide 5, the chip is on the rapidly rotating Intermediate belt 6 deposited, and dropped at the end of the conveyor onto the forming belt 7, the belt speed is significantly lower.

Die Schichthöhe des auf dem Formband abgelegten Streugutes wird durch Abstimmung der Formbandgeschwindigkeit und der Fördermenge der Förderwalzeneinrichtung 2 aufeinander bestimmt. Da die Bandgeschwindigkeit des Zwischenbandes 6 um ein vielfaches, beispielsweise eine Zehnerpotenz, höher ist als die Bandgeschwindigkeit des Formbandes 7, wird der Spangut- Massenstrom auf dem Zwischenband 6 sehr stark auseinandergezogen. Es hat sich gezeigt, daß ein besonders guter Separationswirkungsgrad in Fraktionen bestimmter Spangrößen erreicht wird, wenn die Bandgeschwindigkeit des Zwischenbandes 6 so hoch ist, daß die Späne auf dem Zwischenband vereinzelt werden.The layer height of the spreading material deposited on the forming belt is determined by coordinating the forming belt speed and the conveying quantity of the conveying roller device 2 with one another. Since the belt speed of the intermediate belt 6 is many times, for example a power of ten, higher than the belt speed of the forming belt 7, the bulk material flow on the intermediate belt 6 is pulled apart very strongly. It has been shown that a particularly good separation efficiency is achieved in fractions of certain chip sizes if the belt speed of the intermediate belt 6 is so high that the chips are separated on the intermediate belt.

Alle Späne verlassen an der Abwurfstelle das Zwischenband 6 mit der gleichen Geschwindigkeit und Bewegungsrichtung. Die Separierung des Spangutes wird durch den Luftwiderstand bewirkt, dem jeder Partikel in der ruhenden Luft der Streukammer 3 ausgesetzt ist, und der dafür sorgt, daß die Wurfweite eines großen Spans größer ist, als die eines kleines Spans. Je nach Laufrichtung des Formbandes 7 läßt sich nun eine obere oder untere Deckschicht einer Spanplatte streuen.All chips leave the intermediate belt 6 at the discharge point with the same speed and direction of movement. The separation of the chips is caused by the air resistance to which each particle in the still air of the scattering chamber 3 is exposed, and which ensures that the throw of a large chip is larger than that of a small chip. Depending on the running direction of the forming belt 7, an upper or lower covering layer of a particle board can now be sprinkled.

Um unerwünscht grobe Späne sowie größere Leimzusammenschlüsse vom zu streuenden Spänevlies fernzuhalten, durchkreuzt ein Umlaufsieb 8 den Abwurfbereich des Streugutes. Das Umlaufsieb 8 bewirkt ein Bremsen und Vergleichmäßigen des Streugutes vor der Ablage. Es ist im Ausführungsbeispiel als Stabrost ausgebildet und transportiert aufgefangenes Material in den Auffangraum 9. Das andere Ende des Umlaufsiebes 8 ragt in einen weiteren Auffangraum, in dem sich eine Bürstenwalze 10 befindet, die der Reinigung des Umlaufsiebes 8 dient. Das Umlaufsieb 8 hat neben der Siebwirkung den zusätzlichen Effekt, daß es Luftwirbel, die eventuell durch das schnell laufende Zwischenband 6 erzeugt werden, vom Formband 7 fernhält.In order to keep unwanted coarse chips and larger glue assemblies away from the chip fleece to be spread, a circulating sieve 8 crosses the discharge area of the spreading material. The circulating sieve 8 brings about braking and leveling of the spreading material before depositing. In the exemplary embodiment, it is designed as a bar grate and transports collected material into the collecting space 9. The other end of the circulating sieve 8 projects into a further collecting space, in which there is a brush roller 10, which serves to clean the circulating sieve 8. The circulation sieve 8 has in addition to the sieving effect the additional effect that there are air vortices that may be caused by the fast-running Intermediate belt 6 are generated, keeps away from the forming belt 7.

Im Bereich des Umlaufsiebes 8 sind über die Bandbreite verteilt mehrere als Schieber 11 ausgebildete Materialentnahmevorrichtungen angeordnet, die horizontal in den Abwurfbereich des Streugutes bewegbar sind. Dabei ist jeder Schieber einzeln verschiebbar, so daß damit einer ungleichmäßigen Streugutmengenverteilung über die Streubreite entgegengewirkt werden kann. Darüber hinaus kann natürlich durch die Entnahmevorrichtungen je nachdem, wie weit sie in den Abwurfbereich hineingeschoben werden, die gesamte Schichtstärke des Spanvlieses bestimmt werden. Die Entnahmevorrichtungen sind so angeordnet, daß sie sich in dem vom Zwischenband 6 abgewandten Abwurfbereich befinden, so daß in erster Linie grobes Streugutmaterial entnommen wird. Zum Abtransport des durch die Schieber 11 entnommenen Streugutes ist der vom Abwurfbereich abgewandte Teil des Schiebers 11 rinnenförmig ausgebildet, so daß hier die Partikel aufgenommen werden können.In the area of the circulating sieve 8, a plurality of material removal devices designed as slides 11 are arranged distributed over the belt width and can be moved horizontally into the discharge area of the spreading material. Each slide can be moved individually so that an uneven distribution of spreading material over the spreading width can be counteracted. In addition, depending on how far they are pushed into the discharge area, the entire layer thickness of the chip fleece can of course be determined by the removal devices. The removal devices are arranged so that they are located in the discharge area facing away from the intermediate belt 6, so that primarily coarse grit material is removed. For the removal of the spreading material removed by the slides 11, the part of the slider 11 facing away from the discharge area is formed in a channel-shaped manner so that the particles can be picked up here.

Im Abwurfbereich des Streugutes und unterhalb des Umlaufsiebes 8 sind mehrere Streuwalzen 12 angeordnet, die das Streugut vor der Ablage auf dem Formband 7 abbbremsen, so daß Vermischungen der einzelnen Fraktionen vermieden werden. Diese Streuwalzen 12 sind mit gewölbten Aufnahmearmen versehen, so daß die einzelnen Partikel "gedämpft" aufgenommen und anschließend auf dem Formband 7 abgelegt werden.In the discharge area of the spreading material and below the circulating sieve 8, a plurality of spreading rollers 12 are arranged, which brake the spreading material before being deposited on the forming belt 7, so that mixing of the individual fractions is avoided. These spreading rollers 12 are provided with curved receiving arms, so that the individual particles are "damped" and then placed on the forming belt 7.

Zur Beeinflussung der durch das Zwischenband 6 erzeugten Luftströmung innerhalb der Streukammer 3 ist ein Deckband 13 vorgesehen, welches als im wesentlichen L-förmig umlaufendes Endlosband ausgebildet ist. Durch Verschieben einzelner Lagerrollen des Deckbandes 13, insbesondere der Lagerrolle 14, kann die Strömung innerhalb des Luftspaltes zwischen dem Zwischenband 6 und dem Deckband 13 in einem weiten Bereich eingestellt werden. Das Deckband 13 erfährt seine stärkste Umlenkung an der Lagerrolle 15, welche in einem oberhalb der Schieber 11 liegenden Bereich der Streukammer 3 angeordnet ist. Dadurch wird eventuell an dem Deckband 13 haftendes Streugut an einer Stelle abgeworfen, von der aus es nicht mehr zum Formband 7 gelangen kann. Im Bereich der Lagerrolle 15 ist auch die Reinigungswalze 16 vorgesehen, so daß der dem Zwischenband 6 zugewandte Bandbereich des Deckbandes 13 stets frei von Ablagerungen ist. Eine weitere Reinigungswalze 17 ist dem vom Deckband 13 abgewandten Trum des Zwischenbandes 6 zugeordnet.In order to influence the air flow generated by the intermediate belt 6 within the scattering chamber 3, a cover belt 13 is provided, which is designed as an essentially L-shaped continuous belt. The flow within the air gap between the intermediate belt 6 and the cover belt 13 can be adjusted within a wide range by displacing individual bearing rolls of the cover band 13, in particular the bearing roll 14. The shroud 13 experiences its strongest deflection on the bearing roller 15, which is in an area above the slider 11 Scattering chamber 3 is arranged. As a result, any spreading material adhering to the cover band 13 is thrown off at a point from which it can no longer reach the forming band 7. The cleaning roller 16 is also provided in the region of the bearing roller 15, so that the band region of the cover band 13 facing the intermediate band 6 is always free of deposits. Another cleaning roller 17 is assigned to the run of the intermediate belt 6 facing away from the shroud 13.

BezugszeichenlisteReference list

11
VorratsbunkerStorage bunker
22nd
FörderwalzeneinrichtungConveyor roller device
33rd
StreukammerScattering chamber
44th
StreuwalzeSpreader roller
55
Rutscheslide
66
ZwischenbandIntermediate band
77
FormbandForm ribbon
88th
UmlaufsiebCirculating sieve
99
AuffangraumCollecting room
1010th
BürstenwalzeBrush roller
1111
SchieberSlider
1212th
StreuwalzeSpreader roller
1313
DeckbandShroud
1414
LagerrolleStorage role
1515
LagerrolleStorage role
1616
ReinigungswalzeCleaning roller
1717th
ReinigungswalzeCleaning roller

Claims (12)

  1. Device for continuously applying a layer of scattering material from a storage hopper onto a moulding belt, the scattering material prior to deposit on the moulding belt being divided into a plurality of fractions of differing particle size, characterized in that the scattering material coming from the storage hopper (1) is first deposited on an intermediate band (6), whose band speed is several times higher than the band speed of the moulding belt (7), and is then dropped onto the moulding belt (7).
  2. Device according to claim 1, characterized in that the rotational speed of the intermediate band (6) is at least five times higher than that of the moulding belt (7).
  3. Device according to claim 2, characterized in that the rotational speed of the intermediate band (6) is five to fifteen times as high as that of the moulding belt (7).
  4. Device according to one of the preceding claims, characterized in that the band speed of the intermediate band (6) is so selected that the scattering material particles are spread out on the intermediate band (6).
  5. Device according to one of the preceding claims, characterized in that a revolving screen (8) is provided in the drop region between the moulding belt (7) and the intermediate band (6).
  6. Device according to one of the preceding claims, characterized in that at least one scattering material removal device (11), which is movable into the drop region, is provided.
  7. Device according to claim 5 and 6, characterized in that the removal device (11) is disposed in the immediate vicinity of the revolving screen (8).
  8. Device according to claim 6 or 7, characterized in that disposed over the entire scattering width or band width is a plurality of removal devices (11), which are displaceable independently of one another and are operated as a function of the quantitative distribution of scattering material over the moulding belt width determined by a measuring station.
  9. Device according to one of the preceding claims, characterized in that an adjustable closing surface is disposed above the intermediate band (6).
  10. Device according to claim 9, characterized in that the closing surface is formed by a drivable revolving band (13).
  11. Device according to one of the preceding claims, characterized in that the intermediate band (6) and/or the revolving band (13) is contoured.
  12. Device according to one of the preceding claims, characterized in that at least one scattering cylinder (12) is disposed in the drop region of the intermediate band (6).
EP19910107012 1991-04-30 1991-04-30 Device for continously laying a fibrous, felted mat Expired - Lifetime EP0511425B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19910107012 EP0511425B1 (en) 1991-04-30 1991-04-30 Device for continously laying a fibrous, felted mat
DE59106627T DE59106627D1 (en) 1991-04-30 1991-04-30 Device for the continuous application of a layer of spreading material.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19910107012 EP0511425B1 (en) 1991-04-30 1991-04-30 Device for continously laying a fibrous, felted mat

Publications (2)

Publication Number Publication Date
EP0511425A1 EP0511425A1 (en) 1992-11-04
EP0511425B1 true EP0511425B1 (en) 1995-10-04

Family

ID=8206683

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910107012 Expired - Lifetime EP0511425B1 (en) 1991-04-30 1991-04-30 Device for continously laying a fibrous, felted mat

Country Status (2)

Country Link
EP (1) EP0511425B1 (en)
DE (1) DE59106627D1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29507686U1 (en) * 1995-05-10 1995-07-27 Texpan S.p.A., Muggio Device for classifying spreadable material
CN1043019C (en) * 1995-09-14 1999-04-21 南京林业大学 Method for mfg. oriented structure shaving board
AU2690597A (en) * 1996-03-28 1997-10-22 G. Siempelkamp Gmbh & Co. Plant for sorting and spreading wood chips during the production of chip boards
DE19909607A1 (en) 1999-03-05 2000-09-07 Dieffenbacher Schenck Panel Process for the production of plate-shaped products
DE102008007950B3 (en) * 2008-02-07 2008-11-06 Kronotec Ag Plant scattering wood chips or fibers onto conveyor to make e.g. chipboard or orientated strand board, includes magnetic distribution chute

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1205274B (en) * 1961-03-01 1965-11-18 Schenck Gmbh Carl Device for the production of molded bodies, in particular from wood chips
CH512991A (en) * 1970-12-09 1971-09-30 Uniboard Ag Chip machine

Also Published As

Publication number Publication date
EP0511425A1 (en) 1992-11-04
DE59106627D1 (en) 1995-11-09

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