EP0230483B1 - Process for uniforming spread particles and device for performing the process - Google Patents

Process for uniforming spread particles and device for performing the process Download PDF

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Publication number
EP0230483B1
EP0230483B1 EP86100658A EP86100658A EP0230483B1 EP 0230483 B1 EP0230483 B1 EP 0230483B1 EP 86100658 A EP86100658 A EP 86100658A EP 86100658 A EP86100658 A EP 86100658A EP 0230483 B1 EP0230483 B1 EP 0230483B1
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EP
European Patent Office
Prior art keywords
particle
layer
width
casing
slides
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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EP86100658A
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German (de)
French (fr)
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EP0230483A1 (en
Inventor
Andrej Buksek
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Carl Schenck AG
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Carl Schenck AG
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Publication date
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Priority to EP86100658A priority Critical patent/EP0230483B1/en
Priority to DE8686100658T priority patent/DE3669838D1/en
Priority to US07/001,706 priority patent/US4703783A/en
Publication of EP0230483A1 publication Critical patent/EP0230483A1/en
Application granted granted Critical
Publication of EP0230483B1 publication Critical patent/EP0230483B1/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 particle material can consist of wood chips of normal dimensions, as are required for the production of chipboard, or of large-scale chips such as wafers and strands and also of mixtures of these chips with one another or with wood fibers;
  • the particles to be scattered can also consist of plastic granules.
  • a device for forming a particle stream of constant thickness, in particular from wood particles mixed with binders, such as chips, has become known, with several distribution devices distributed over the width of a conveyor track and lying in front of a metering device with respect to the conveying direction thereof are, which are effective when exceeding a certain height of a particle cluster in the areas in front of them via controls known per se on a distribution device for compensating for the accumulation height differences of the particle cluster transverse to the conveyor track.
  • Such a device can only be used if a correspondingly large quantity is available as a control quantity for the purpose of homogenizing the material to be dosed before dosing. It is always mixed new material to be dosed with existing material.
  • the material consists of particles which have been provided with binders at different times. It need not be explained further that, for example, particles provided with cement, which are also moistened, are brought together with moist particles, which have only been freshly provided with cement as a binder, after hardening of the cement, and such a particle mixture has a soft influence on the one to be pressed Plate.
  • particles already cured with binder can no longer bond with the freshly bindered particles, so that despite the same density in the nonwoven area, the finished board becomes a reject due to a lack of bonding.
  • DE-PS 947 640 describes a method and a device for producing chipboard or the like, the chip material being applied to a roller table by an endless belt, chain grate or the like, or to sheet metal supports placed thereon, and the fleece thus obtained after stripping too much applied goods are formed into pieces under previous or subsequent pre-pressing, in which, in order to achieve items of equal weight, the goods undergo continuous automatic weight control before or after their pre-pressing and their height is adjusted accordingly by the scraper, which is height-controlled from the scales.
  • This method also works with an excess of particles, particles being removed from the surface of the material again depending on the fleece weight, that is to say after the particles have been scattered, in order to achieve the same weight.
  • EP-A 69 162 discloses a method for influencing the density distribution of a chip fleece to be scattered over its scattering width, in which the amount of at least one partial stream is reduced from at least one part of its width from a chip stream consisting of several partial streams. This enables the dumping height in the deposited fleece to be evened out by adjusting lockable suction probes in accordance with the previously identified inequalities in dumping height.
  • the object of the invention is to propose a method and a device to achieve a desired thickness in a particle fleece if the amount of particles to be scattered is greater than the amount of particles required to achieve the solids density without the excess amount being returned is mixed with the fleece to be spread or sprinkled on.
  • an inventive housing which, unaffected, reaches the particle stream in its composition for storage as a fleece can and where the necessary influence is limited due to the target thickness over the spread only to the edge area of the expansion of the still closed particle flow in the nonwoven direction; by the arrangement of slides according to the invention, with which a housing can be closed or opened, an intermediate bunkering of compensating material is created, which is fed directly to a reprocessing in the event of an excess, without its deposition in the fleece being necessary beforehand and that if there is too
  • Claims 4 and 5 protect another type of conveyor devices which are arranged in the housing according to the invention.
  • Claim 6 shows a certain way in which excess material can be reused without being deposited in the fleece.
  • Claim 7 places a particularly advantageous embodiment of the housing according to the invention under protection, which is particularly suitable for certain fields of application and when using a screw conveyor as a conveyor, since no residues can remain in the housing.
  • Claim 9 provides an actuator of the slide according to the measured actual values in the fleece in comparison with the target values under protection.
  • the slide is adjusted in an inventive manner via the actual values measured in the fleece with the aid of a computer, so that the particle fleece immediately following it already has the desired values during a subsequent measurement in the fleece.
  • particles 5 to be scattered are brought into the interior of the bunker via an entry 2.
  • the particles can be wood or plastic chips which are provided with already processed urea glue or dry particles such as plaster or cement for mutual solidification of the chips when exposed to moisture present in the chips; Mixtures of wood and plastic shavings can also be introduced into the bunker, the plastic shavings causing the wood shavings to solidify when a heated press presses and presses the fleece fleece together on the individual floors during the production of plate-shaped objects.
  • the bunker 1 also has a floor conveyor 3, which closes the bunker at the bottom and with which the particles entered are fed to a scratch discharge 4 as a result of the movement of the floor conveyor 3 in the direction of the arrow.
  • the scraper discharge 4 consists of a row of scraper rollers 6 arranged one above the other, which remove particles from the particle supply in accordance with their rotation in the direction of the arrow and feed them to a distribution device 7.
  • a closed particle stream is created which moves between the front deflection 9 of the floor conveyor 3 and a housing 10 which, like the scraper rollers 6, extends over the entire width of the bunker.
  • the distance between the front deflection 9 of the floor band 3 and the housing 10 is such that a large part of the closed particle flow can be moved through this opening unhindered.
  • the amount of the closed particle stream 8 is such that it has an excess in relation to the endless chip fleece to be deposited on a forming belt 11.
  • the housing 10 which contains a conveyor device 12 and which extends over the entire width of the bunker and thus also over the spread of the future fleece, serves for the metered removal and addition of particles from the closed Senen particle stream 8.
  • the housing 10 and the conveyor device 12 located therein which are explained in more detail in the following figures, meter the distribution device 7, according to the information coming from a thickness measuring device 13, via a computer 14 in addition to the closed particle stream 8 to further particles.
  • the several housings 10 and several conveying devices 12 shown in FIG. 1 show at which points the dispensing and adding devices consisting of housing 10 conveying device 12 and openings in the housing 10 which can be closed by slides can be arranged in the closed particle stream 8. If the housing 10 is located in the region of the front deflection 9 of the floor band 3, no further housings 10 are to be arranged in the further flow of the particles.
  • a single housing 10 below the front deflection 9 in the area of the distribution device 7 either by means of opening rollers 15, which housing, from the excess quantity of the closed particle stream 8, the correct quantity required for a target thickness distribution in the fleece according to the actual values be determined by the thickness measuring device 13, metered out; or there may be a housing 10 arranged downstream of each opening roller 15, which also doses the desired thickness for the fleece from the excess quantity, or a housing 10 with a conveyor device 12 contained therein can be provided at the end of each strand of transfer rollers 16 pass on the excess quantity, as explained above, to the target thickness corresponding particle quantities to distribution rollers 17.
  • the arrangement of the housing 10 with conveyor devices 12 at the end of the transfer rollers 16, which is within the scope of the invention, is advantageous, for example, when there is a risk of segregation in the course of the particle stream until it reaches the scraper rollers 6 as far as the opening rollers 17; this is particularly the case with very different specific weights between the binder and the particles to be bonded if the binders are not yet adhering to the particles to be bonded.
  • the particles to be connected that is to say chips, are already coated by the latter in the bunker 1, so that segregation between these components cannot take place.
  • the housing 10 is particularly preferably to be arranged opposite the front deflection 9.
  • the particles are brought down onto the forming belt 11 as a veil via the opening rollers 17.
  • a number of mutually overlapping documents 18 can also be provided, which, in the case of their flexible design, carry headers 19.
  • the fleece 20 located on the documents 18 or the forming belt 11, which has the desired thickness over its spreading width, is then further processed into plate-shaped materials.
  • FIG. 2 schematically shows the position of slides 22 which, in accordance with the fleece course 23 present in this area, allow excess particles 5 to enter the housing 10 via the spreading width 24 and thus feed them to a screw conveyor 25.
  • Adding slides 26 allow particles to be added to the fleece 20 from the housing 10 via the rotating screw conveyor 25 if a negative fleece course 27 is present.
  • the rotating screw conveyor 25 and the housing 10 are extended beyond the spreading width, so that even after dosing, any excess particulate material (excess scattering particles) 28 can be discharged through an opening 29 in the housing outside the spreading width 24 and, for example, in the circuit back into the bunker 1 (Fig. 1) can be traced.
  • Fig. 3 shows an embodiment of the subject matter of the invention on an enlarged scale.
  • the closed particle stream 8 discharged from the scraper rollers 6 is transported between the front deflection 9 of the floor belt 3 and the housing 10.
  • the housing 10 has a circular part 30 in which a plurality of addition slides 26, adapted to the circular shape via the spreading width, can optionally close or open addition slots 31, depending on the information from the thickness measurement 13 in the fleece.
  • the rotating screw conveyor 25 is provided as a conveyor.
  • the slide 22 lying in the plane of the drawing closes the removal slot 32.
  • a partial particle flow 33 enters the housing 10 through the open slide 22 behind it and, as already described for FIG.
  • Fig. 3 it can be seen that the housing 10 is arranged in the edge region of the expansion of the still closed particle flow in the nonwoven conveying direction.
  • a guide flap 34 is arranged in the area of the housing 10 and behind it, which causes the metered total particle flow to be deposited together in the fleece.
  • FIG. 4a shows the configuration of a housing in the form of a hexagon, in which parallel sides 35, 36 of the housing can optionally be closed and opened by slides 22 or addition slides 26.
  • Such a configuration of the housing simplifies the manufacture and adjustment of the mechanical guidance of the individually operable slides 22 and individually operable addition slides 26.
  • FIG. 4b shows a square housing 10, in which the slides 22 and 26 selectively close or open adjacent sides 37, 38 which are provided with slots.
  • Such configurations are particularly suitable, as also shown in FIG. 1, for installations of the housing 10 and the conveying device 12 in the region of the transfer rollers 16 and opening rollers 15.
  • an oppositely coiled conveyor screw 40 is provided in the housing 10.
  • the oppositely coiled screw conveyor 40 can also be displaced by a dimension 41 from the center 42 of the spreading width 24.
  • the opposite spiral begins in the middle of the screw conveyor 40, so that excess particle material can be discharged from the housing 10 via openings 29 to the left and right of the spreading width.
  • a scraper conveyor 43 arranged in the housing 10 or a clearing belt 44 move as endless conveying members around two deflection points 45, 46.
  • the housing 10 has a slot in its bottom part 47 over the entire spreading width. This slot can be closed and opened by means of a plurality of addition slides 26 arranged over the bulk width.
  • the housing 10 Upstream, the housing 10 has, in a roof slope 48, a slot which extends over the entire spreading width and which can likewise be closed with a plurality of slides 22.
  • a decrease in particle material upstream and a particle addition downstream from the same particle stream can thus be controlled, so that a predetermined target density can be achieved in the fleece 20 over its spreading width 24.

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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)

Description

Regelverfahren zur fortlaufenden Konstanthaltung einer vorbestimmbaren Schütthöhe in einem Partikelvlies mit von Kratzerwalzen aufgelösten in Partikelschleier umgesetzte Partikelströme, aus denen positioniert Teilströme vor einem Streukopf entnommen werden.Control method for the constant maintenance of a predeterminable bed height in a particle fleece with particle streams converted into particle veils by scratch rollers, from which partial streams positioned in front of a spreading head are removed.

Bei der Herstellung von aus Partikeln bestehenden Vliesen, die anschließend zu Platten verpreßt werden, ist es erforderlich, mit Bindemitteln versehene Partikel auf Unterlagen aufzustreuen, wobei die Güte der durch Verpressung verfestigten Platte sehr stark von einer gleichmäßigen Dichte des gestreuten Vlieses über den Plattenquerschnitt abhängig ist. Hierbei ist es gleichgültig, ob es sich um Platten handelt, deren Bindemittel aus Harnstoffleim, Zement oder Gips besteht. Genauso kann das Partikelmaterial aus Holzspänen normaler Abmessungen, wie sie für die Herstellung von Spanplatten benötigt werden, bestehen, oder aus großflächigen Spänen wie Wafers und Strands und auch aus Mischungen dieser Späne untereinander oder mit Holzfasern; auch können die zu streuenden Partikel aus Kunststoffgranulaten bestehen.In the production of nonwovens made of particles, which are then pressed into plates, it is necessary to sprinkle particles provided with binders on substrates, the quality of the plate consolidated by compression being very dependent on a uniform density of the scattered nonwoven over the plate cross-section . It is irrelevant whether the boards are made of urea glue, cement or plaster. In the same way, the particle material can consist of wood chips of normal dimensions, as are required for the production of chipboard, or of large-scale chips such as wafers and strands and also of mixtures of these chips with one another or with wood fibers; The particles to be scattered can also consist of plastic granules.

Durch die DE-PS 1 133 532 ist eine Vorrichtung zur Bildung eines Teilchenstromes konstanter Dicke, insbesondere aus mit Bindemitteln versetzten Holzteilchen, wie Spänen bekannt geworden, wobei mehrere über die Breite einer Förderbahn verteilte, in bezug auf deren Förderrichtung vor einer Dosiereinrichtung liegende Ansprecheinrichtungen vorgesehen sind, die bei Überschreiten einer bestimmten Höhe eines Teilchenhaufens in den vor ihnen liegenden Bereichen über an sich bekannte Steuerungen auf eine Verteileinrichtung zum Ausgleichen der Stauhöhenunterschiede des Teilchenhaufens quer zur Förderbahn wirksam sind. Eine derartige Vorrichtung ist nur dann einsetzbar, wenn vor dem Dosieren eine entsprechend große Menge als Regelmenge zur Vergleichmäßigung des zu dosierenden Materials vorhanden ist. Es wird also stets neu hinzukommendes zu dosierendes Material mit bereits vorhandenem Material vermischt. Dies führt dazu, daß das Material aus Partikeln besteht, welches zu verschiedenen Zeiten mit Bindemitteln versehen wurde. Es muß nicht weiter ausgeführt werden, daß beispielsweise mit Zement versehene Partikel, die darüber hinaus angefeuchtet sind, zufolge Aushärten des Zements zusammengebracht werden mit feuchten Partikeln, die erst frisch mit Zement als Bindemittel versehen wurden, und weichen Einfluß eine derartige Partikelmischung auf die zu verpressende Platte hat. Die Folgen sind offensichtlich, bereits mit ausgehärtetem Bindemittel versehene Partikel können keine Bindung mehr mit den frisch mit Bindemittel versehenen Partikeln eingehen, so daß trotz gleicher Dichte im Vliesbereich die fertige Platte zufolge mangelnder Bindung zum Ausschuß wird. Dieser am Beispiel einer Platte mit Zementbindung dargestellte Nachteil des Standes der Technik ist ohne weiteres auch auf Spanplatten, wie oben näher definiert, und auf Partikelplatten, bei denen Gips die Bindung bewerkstelligt, oder bei Platten aus Granulat übertragbar.From DE-PS 1 133 532 a device for forming a particle stream of constant thickness, in particular from wood particles mixed with binders, such as chips, has become known, with several distribution devices distributed over the width of a conveyor track and lying in front of a metering device with respect to the conveying direction thereof are, which are effective when exceeding a certain height of a particle cluster in the areas in front of them via controls known per se on a distribution device for compensating for the accumulation height differences of the particle cluster transverse to the conveyor track. Such a device can only be used if a correspondingly large quantity is available as a control quantity for the purpose of homogenizing the material to be dosed before dosing. It is always mixed new material to be dosed with existing material. This leads to the fact that the material consists of particles which have been provided with binders at different times. It need not be explained further that, for example, particles provided with cement, which are also moistened, are brought together with moist particles, which have only been freshly provided with cement as a binder, after hardening of the cement, and such a particle mixture has a soft influence on the one to be pressed Plate. The consequences are obvious: particles already cured with binder can no longer bond with the freshly bindered particles, so that despite the same density in the nonwoven area, the finished board becomes a reject due to a lack of bonding. This disadvantage of the prior art, which is illustrated using the example of a board with a cement bond, can also be readily transferred to particle boards, as defined in more detail above, and to particle boards, in which gypsum produces the bond, or to boards made of granulate.

Durch die DE-PS 947 640 ist ein Verfahren und eine Vorrichtung zur Herstellung von Holzspanplatten oder dergleichen, wobei das Spangut auf einen Rollgang ein endloses Band, Kettenrost oder dgl., bzw. auf auf demselben aufgelegte Blechunterlagen aufgetragen und das so erhaltene Vlies nach Abstreifen zuviel aufgetragenen Gutes unter vorheriger oder nachheriger Vorpressung in Stücke geformt wird, bekannt geworden, bei dem zum Erreichen gewichtsgleicher Gutstücke das Gut vor oder nach seiner Vorpressung einer fortlaufenden selbsttätigen Gewichtskontrolle unterzogen und seine Höhe durch den von der Waage aus höhengesteuerten Abstreifer entsprechend eingestellt wird. Auch dieses Verfahren arbeitet mit einer Übermenge von Partikeln, wobei in Abhängigkeit des Vliesgewichtes, also nach Aufstreuung der Partikel zur Erreichung gleichen Gewichts Partikel von der Oberfläche des Gutes wieder abgenommen werden. Außer der Zerstörung der Oberfläche durch nachträglichen Eingriff in das gestreute Vlies treten dieselben Nachteile auf, wie sie bei dem zunächst genannten Stand der Technik auftreten. Eine gleichmäßige Dichteverteilung läßt sich darüber hinaus auch nicht erreichen, wenn Mischgut, beispielsweise Partikel aus verschiedenen Holzarten oder gemischt mit Granulat zur Verwendung kommen, da zufolge des unterschiedlichen spezifischen Gewichts in der Partikelmischung und zufolge geringer Unterschiede in der Holzmischung beispielsweise ein Zusammenschluß mehrerer Holzpartikel höheren spezifischen Gewichts einerseits und andererseits ein Zusammenschluß von Kunststoffgranulat geringeren spezifischen Gewichts zwangsläufig über die Streubreite eine fertige Platte entsteht, deren Dichte nicht gleichförmig über die gesamte Platte verteilt ist.DE-PS 947 640 describes a method and a device for producing chipboard or the like, the chip material being applied to a roller table by an endless belt, chain grate or the like, or to sheet metal supports placed thereon, and the fleece thus obtained after stripping too much applied goods are formed into pieces under previous or subsequent pre-pressing, in which, in order to achieve items of equal weight, the goods undergo continuous automatic weight control before or after their pre-pressing and their height is adjusted accordingly by the scraper, which is height-controlled from the scales. This method also works with an excess of particles, particles being removed from the surface of the material again depending on the fleece weight, that is to say after the particles have been scattered, in order to achieve the same weight. In addition to the destruction of the surface by subsequent intervention in the scattered fleece, the same disadvantages occur as in the prior art mentioned above. In addition, a uniform density distribution cannot be achieved if mixed material, for example particles from different types of wood or mixed with granulate, are used, because due to the different specific weight in the particle mixture and small differences in the wood mixture, for example, an amalgamation of several wood particles is more specific Weight on the one hand and on the other hand a combination of plastic granules of lower specific weight inevitably results in a finished plate over the spread, the density of which is not uniformly distributed over the entire plate.

Durch die EP-A 69 162 ist ein Verfahren zur Beeinflussung der Dichteverteilung eines zu streuenden Spänevlieses über seine Streubreite bekannt geworden, bei dem aus einem aus mehreren Teilströmen bestehenden Spänestrom die Menge mindestens eines Teilstroms an mindestens einer Stelle seiner Breite reduziert wird. Hierdurch gelingt eine Vergleichmäßigung der Schütthöhe im abgelegten Vlies durch Verstellung arretierbarer Saugrüssel entsprechend den zuvor festgestellten Ungleichheiten der Schütthöhe.EP-A 69 162 discloses a method for influencing the density distribution of a chip fleece to be scattered over its scattering width, in which the amount of at least one partial stream is reduced from at least one part of its width from a chip stream consisting of several partial streams. This enables the dumping height in the deposited fleece to be evened out by adjusting lockable suction probes in accordance with the previously identified inequalities in dumping height.

Ausgehend hiervon liegt der Erfindung die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung in Vorschlag zu bringen, eine Solldicke in einem Partikelvlies zu erreichen, wenn die zu streuende Partikelmenge größer als die zur Erreichung der Soiidichte erforderliche Partikelmenge ist, ohne daß die Überschußmenge bei ihrer Rückführung mit dem aufzustreuenden oder aufgestreuten Vlies vermischt wird. Diese Aufgabe wird, ausgehen von der zuletzt genannten Druckschrift EP-A 69 162 mit den kennzeichnenden Merkmalen des Anspruchs 1 gelöst. Insbesondere durch die Verfahrensschritte der ferngesteuerten Entnahme und Abgabe von Partikeln quer zur Ablaufrichtung des Förderbandes aus und in den Partikelschleier in jedem Abschnitt des Streukopfs, und durch eine fortlaufende Messung der Schütthohe im abgelegten Vlies in jedem Abschnitt wird ein Regelverfahren zur fortlaufenden Konstanthaltung einer vorbestimmten Schütthohe in einem abgelegten Partikelvlies erreicht, ohne daß eine Vermischung verschieden lang mit Bindemittel versehener Partikel auftreten kann; auch ist eine nochmalige Beeinflussung der Oberfläche des Vlieses durch Hilfsmittel nicht erforderlich.Proceeding from this, the object of the invention is to propose a method and a device to achieve a desired thickness in a particle fleece if the amount of particles to be scattered is greater than the amount of particles required to achieve the solids density without the excess amount being returned is mixed with the fleece to be spread or sprinkled on. This problem is solved, starting from the last-mentioned document EP-A 69 162 with the characterizing features of claim 1. In particular through the procedural steps of the remote controlled removal and delivery of particles transversely to the direction of the conveyor belt from and into the particle veil in each section of the spreading head, and through a continuous measurement of the bulk height in the deposited fleece in In each section, a control method for continuously maintaining a predetermined bulk height in a deposited particle fleece is achieved without mixing of particles provided with binder for different lengths; a further influencing of the surface of the fleece by means of auxiliary means is not necessary.

Ausgehend von einer Vorrichtung zur Bildung eines Partikelvlieses mit einem Partikelbunker mit Kratzeraustrag und Abwurf zur Bildung eines über die Breite eines bewegten Formbands frei fallenden Partikelstroms mit einer Mehrzahl von quer zur Formbanderstreckung und im Bereich des Partikelstroms angeordneten Steuereinrichtungen zur Entnahme von Teilstömen aus dem Partikelstrom über die Breite des auf dem Formband abzulegenden Partikelvlieses und einer Fördereinrichtung zur Rückführung der entnommenen Partikel in den Partikelbunker (EPA-A 69 162) wird mit den kennzeichnenden Merkmalen des Anspruchs 2 ein erfinderisches Gehäuse offenbart, welches den Partikelstrom in seiner Zusammensetzung unbeeinflußt zur Ablage als Vlies gelangen läßt und wobei sich die erforderlich werdende Beeinflussung zufolge der Solldicke über die Streubreite lediglich auf den Randbereich der Ausdehnung des noch geschlossenen Partikelstroms in Vliesrichtung beschränkt; durch die erfindungsgemäße Anordnung von Schiebern, mit denen ein Gehäuse verschlossen bzw. geöffnet werden kann, wird eine Zwischenbunkerung von Ausgleichsmaterial geschaffen, welches bei einem Überschuß direkt einer Wiederverarbeitung zugeführt wird, ohne daß seine Ablagerung im Vlies vorher erforderlich würde und daß bei einem Zuwenig seine sofortige Zugabe in das zu streuende Partikelvlies erreicht würde.Starting from a device for forming a particle fleece with a particle bunker with scratch discharge and discharge to form a particle stream freely falling over the width of a moving molding tape with a plurality of control devices arranged transversely to the molding tape stretch and in the area of the particle stream for removing partial streams from the particle stream via the Width of the particle fleece to be deposited on the forming belt and a conveying device for returning the removed particles to the particle bunker (EPA-A 69 162), with the characterizing features of claim 2, an inventive housing is disclosed which, unaffected, reaches the particle stream in its composition for storage as a fleece can and where the necessary influence is limited due to the target thickness over the spread only to the edge area of the expansion of the still closed particle flow in the nonwoven direction; by the arrangement of slides according to the invention, with which a housing can be closed or opened, an intermediate bunkering of compensating material is created, which is fed directly to a reprocessing in the event of an excess, without its deposition in the fleece being necessary beforehand and that if there is too little immediate addition into the particle fleece to be scattered would be achieved.

Im Anspruch 3 werden besonders bevorzugte Fördereinrichtungen unter Schutz gestellt.In claim 3, particularly preferred funding facilities are placed under protection.

Die Ansprüche 4 und 5 stellen eine andere Art Fördereinrichtungen, die in dem erfindungsgemäßen Gehäuse angeordnet sind, unter Schutz.Claims 4 and 5 protect another type of conveyor devices which are arranged in the housing according to the invention.

Anspruch 6 zeigt eine bestimmte Art, wie überschüssiges Gut ohne Ablage im Vlies einer Wiederverwendung zugeführt werden kann.Claim 6 shows a certain way in which excess material can be reused without being deposited in the fleece.

Mit Anspruch 7 wird eine besonders vorteilhafte Ausgestaltung des erfindungsgemäßen Gehäuses unter Schutz gestellt, welches sich für bestimmte Anwendungsgebiete und bei Verwendung einer Förderschnecke als Fördereinrichtung besonders eignet, da keinerlei Rückstände im Gehäuse zurückbleiben können.Claim 7 places a particularly advantageous embodiment of the housing according to the invention under protection, which is particularly suitable for certain fields of application and when using a screw conveyor as a conveyor, since no residues can remain in the housing.

Eine andere Art des Gehäuses, die besonders für Förderbänder oder Kratzerketten geeignet ist, wird in Anspruch 8 unter Schutz gestellt.Another type of housing, which is particularly suitable for conveyor belts or scratch chains, is protected in claim 8.

Anspruch 9 stellt eine Betätigungseinrichtung der Schieber zufolge der gemessenen Istwerte im Vlies im Vergleich mit den Sollwerten unter Schutz. Hierbei wird in erfinderischer Weise über die im Vlies gemessenen Istwerte mit Hilfe eines Rechners die Verstellung der Schieber bewirkt, damit das direkt nachfolgende Partikelteilvlies bereits bei einer anschließenden Messung im Vlies die Sollwerte aufweist.Claim 9 provides an actuator of the slide according to the measured actual values in the fleece in comparison with the target values under protection. In this case, the slide is adjusted in an inventive manner via the actual values measured in the fleece with the aid of a computer, so that the particle fleece immediately following it already has the desired values during a subsequent measurement in the fleece.

Eine Anordnung, bei der die Erfindung in verschiedenen Varianten verwirklicht ist, wird anhand der nachfolgenden Zeichnung näher erläutert.An arrangement in which the invention is implemented in different variants is explained in more detail with reference to the following drawing.

Es zeigen:

  • Fig. 1 einen Bunker, aus dem Partikel abgezogen werden und über eine Verteileinrichtung auf ein darunter angeordnetes Formband aufgestreut werden
  • Fig. 2 schematisch die Stellung von Schiebern im Gehäuse, in Abhängigkeit der gemessenen Dickenverteilung im Vlies
  • Fig. 3 in vergrößertem Maßstab den Erfindungsgegenstand am Ende einer Austragsvorrichtung
  • Fig. 4 verschiedene Ausgetaltungen des Gehäuses sowie der Förderer
    • 4a ein sechseckiges Gehäuse
    • 4b ein quadratisches Gehäuse
    • 4c einen Schneckenförderer mit seitlichem Abwurf
    • 4d einen geschlossenen Überschußpartikelkreislauf mit Räumband oder Kratzerkette und ein hierzu besonders geeignetes Gehäuse
Show it:
  • Fig. 1 shows a bunker, from which particles are withdrawn and sprinkled on a distribution belt arranged below a distribution device
  • Fig. 2 shows schematically the position of sliders in the housing, depending on the measured thickness distribution in the fleece
  • Fig. 3 on an enlarged scale the subject of the invention at the end of a discharge device
  • Fig. 4 different configurations of the housing and the conveyor
    • 4a a hexagonal housing
    • 4b a square housing
    • 4c a screw conveyor with side discharge
    • 4d a closed excess particle circuit with clearing belt or scratch chain and a housing that is particularly suitable for this

In einem Bunker 1 werden zu streuende Partikel 5 über einen Eintrag 2 in das Bunkerinnere verbracht. Bei den Partikeln kann es sich um Holz-oder Kunststoffspäne handeln, die mit bereits aufbereitetem Harnstoffleim oder Trockenpartikein wie Gips oder Zement zur gegenseitigen Verfestigung der Späne bei Einwirken von, in den Spänen vorhandener, Feuchtigkeit versehen sind; es können auch Mischungen von Holz- und Kunststoffspänen in den Bunker eingetragen werden, wobei die Kunststoffspäne die Verfestigung der Holzspäne bewirken, wenn bei der Herstellung von plattenförmigen Gegenständen eine beheizte Presse unter Druck und Temperatur das Spänevlies in den einzelnen Etagen zusammenpreßt.In a bunker 1, particles 5 to be scattered are brought into the interior of the bunker via an entry 2. The particles can be wood or plastic chips which are provided with already processed urea glue or dry particles such as plaster or cement for mutual solidification of the chips when exposed to moisture present in the chips; Mixtures of wood and plastic shavings can also be introduced into the bunker, the plastic shavings causing the wood shavings to solidify when a heated press presses and presses the fleece fleece together on the individual floors during the production of plate-shaped objects.

Der Bunker 1 besitzt außerdem ein Bodenband 3, welches den Bunker nach unten abschließt und mit dem die eingetragenen Partikel zufolge der Bewegung des Bodenbandes 3 in Pfeilrichtung einem Kratzeraustrag 4 zugeführt werden. Der Kratzeraustrag 4 besteht im Ausführungsbeispiel aus einer Reihe übereinander angeordneter Kratzwalzen 6, die entsprechend ihrer Rotation in Pfeilrichtung aus dem Partikelvorrat Partikel abnehmen und einer Verteileinrichtung 7 zuführen. Es entsteht ein geschlossener Partikelstrom, der zwischen der vorderen Umlenkung 9 des Bodenbandes 3 und einem Gehäuse 10, welches sich, wie die Kratzwalzen 6, über die gesamte Breite des Bunkers erstreckt, hindurch bewegt. Der Abstand zwischen vorderer Umlenkung 9 des Bodenbandes 3 und dem Gehäuse 10 ist so bemessen, daß ein Großteil des geschlossenen Partikelstroms ungehindert durch diese Öffnung hindurchbewegt werden kann. Der geschlossene Partikelstrom 8 ist in seiner Menge so bemessen, daß er eine Übermenge gegenüber dem auf einem Formband 11 abzulegenden endlosen Spänevlies besitzt.The bunker 1 also has a floor conveyor 3, which closes the bunker at the bottom and with which the particles entered are fed to a scratch discharge 4 as a result of the movement of the floor conveyor 3 in the direction of the arrow. In the exemplary embodiment, the scraper discharge 4 consists of a row of scraper rollers 6 arranged one above the other, which remove particles from the particle supply in accordance with their rotation in the direction of the arrow and feed them to a distribution device 7. A closed particle stream is created which moves between the front deflection 9 of the floor conveyor 3 and a housing 10 which, like the scraper rollers 6, extends over the entire width of the bunker. The distance between the front deflection 9 of the floor band 3 and the housing 10 is such that a large part of the closed particle flow can be moved through this opening unhindered. The amount of the closed particle stream 8 is such that it has an excess in relation to the endless chip fleece to be deposited on a forming belt 11.

Das Gehäuse 10, welches eine Fördereinrichtung 12 beinhaltet und das sich über die gesamte Bunkerbreite und somit auch über die Streubreite des späteren Vlieses erstreckt, dient zum dosierten Abnehmen und Zugeben von Partikeln aus dem geschlossenen Partikelstrom 8. Das Gehäuse 10 und die darin befindliche Fördereinrichtung 12, die in den nachfolgenden Figuren näher erläutert werden, dosieren der Verteileinrichtung 7, entsprechend der von einer Dickenmeßeinrichtung 13, kommenden Informationen über einen Rechner 14 neben dem geschlossenen Partikelstrom 8 weitere Partikel zu.The housing 10, which contains a conveyor device 12 and which extends over the entire width of the bunker and thus also over the spread of the future fleece, serves for the metered removal and addition of particles from the closed Senen particle stream 8. The housing 10 and the conveyor device 12 located therein, which are explained in more detail in the following figures, meter the distribution device 7, according to the information coming from a thickness measuring device 13, via a computer 14 in addition to the closed particle stream 8 to further particles.

Die in Fig. 1 dargestellten, mehreren Gehäuse 10 und mehreren Fördereinrichtungen 12. zeigen, an welchen Stellen die aus Gehäuse 10 Fördereinrichtung 12 und durch Schieber verschließbare Öffnungen im Gehäuse 10 bestehenden Ab- und Zugabeeinrichtungen im geschlossenen Partikelstrom 8, angeordnet sein können. Befindet sich das Gehäuse 10 im Bereich der vorderen Umlenkung 9 des Bodenbandes 3, sind keine weiteren Gehäuse 10 im weiteren Stromverlauf der Partikel anzuordnen. Es ist im Rahmen der Erfindung jedoch auch im Bereich der Verteileinrichtung 7 entweder über Auflösewalzen 15 ein einziges Gehäuse 10 unterhalb der vorderen Umlenkung 9 anzuordnen, welches aus der Übermenge des geschlossenen Partikelstroms 8 die erforderliche richtige Menge für eine Solldickenverteilung im Vlies entsprechend den Istwerten, die von der Dickenmeßeinrichtung 13 bestimmt werden, herausdosiert; oder es können jeder Auflösewalze 15 nachgeordnet ein Gehäuse 10 vorgesehen sein, welches ebenfalls aus der Übermenge die Solldicke für das Vlies herausdosiert oder es können am Ende eines jeden Stranges von Übergabewalzen 16 je ein Gehäuse 10 mit einer darin enthaltenen Fördereinrichtung 12 vorhanden sein, die aus der Übermenge, wie oben erläutert, der Solldicke entsprechende Partikelmengen an Aufteilwalzen 17 weitergeben. Die im Rahmen der Erfindung liegende Anordnung der Gehäuse 10 mit Fördereinrichtungen 12 am Ende der Übergabewalzen 16 ist beispielsweise dann vorteilhaft, wenn die Gefahr einer Entmischung im Verlauf des Partikelstroms vorhanden ist, bis dieser von den Kratzerwalzen 6 bis zu den Auflösewalzen 17 gelangt; dies ist insbesondere gegeben, bei sehr unterschiedlichem spezifischem Gewicht zwischen Bindemittel und zu verbindenden Partikeln, wenn die Bindemittel noch nicht an den zu verbindenden Partikeln haften. Bei aufbereitetem Harnstoffleim hingegen werden die zu verbindenden Partikel, also Späne, bereits von diesem im Bunker 1 ummantelt, so daß eine Entmischung zwischen diesen Komponenten nicht stattfinden kann. In diesem Falle ist das Gehäuse 10 besonders bevorzugt gegenüber der vorderen Umlenkung 9 anzuordnen. Handelt es sich um Granulate oder staubförmige Bindemittel wie Gips oder Zement im trockenen Zustand, also noch nicht angefeuchtet, ist es vorteilhaft, die Übermenge bis kurz vor die Auflösewalzen 17 zu führen und dort die Menge für die Solldichte herauszudosieren.The several housings 10 and several conveying devices 12 shown in FIG. 1 show at which points the dispensing and adding devices consisting of housing 10 conveying device 12 and openings in the housing 10 which can be closed by slides can be arranged in the closed particle stream 8. If the housing 10 is located in the region of the front deflection 9 of the floor band 3, no further housings 10 are to be arranged in the further flow of the particles. However, it is also within the scope of the invention to arrange a single housing 10 below the front deflection 9 in the area of the distribution device 7 either by means of opening rollers 15, which housing, from the excess quantity of the closed particle stream 8, the correct quantity required for a target thickness distribution in the fleece according to the actual values be determined by the thickness measuring device 13, metered out; or there may be a housing 10 arranged downstream of each opening roller 15, which also doses the desired thickness for the fleece from the excess quantity, or a housing 10 with a conveyor device 12 contained therein can be provided at the end of each strand of transfer rollers 16 pass on the excess quantity, as explained above, to the target thickness corresponding particle quantities to distribution rollers 17. The arrangement of the housing 10 with conveyor devices 12 at the end of the transfer rollers 16, which is within the scope of the invention, is advantageous, for example, when there is a risk of segregation in the course of the particle stream until it reaches the scraper rollers 6 as far as the opening rollers 17; this is particularly the case with very different specific weights between the binder and the particles to be bonded if the binders are not yet adhering to the particles to be bonded. In the case of processed urea glue, on the other hand, the particles to be connected, that is to say chips, are already coated by the latter in the bunker 1, so that segregation between these components cannot take place. In this case, the housing 10 is particularly preferably to be arranged opposite the front deflection 9. If it is granules or dust-like binders such as gypsum or cement in the dry state, ie not yet moistened, it is advantageous to guide the excess until shortly before the opening rollers 17 and to meter out the amount for the target density there.

Über die Auflösewalzen 17 werden die Partikel auf das Formband 11 als Schleier niedergebracht. Anstelle des Formbandes 11 kann auch eine Reihe sich gegenseitig überlappender Unterlagen 18 vorgesehen sein, die im Falle ihrer flexiblen Ausbildung Kopfleisten 19 tragen. Das auf den Unterlagen 18 oder dem Formband 11 befindliche Vlies 20, welches über seine Streubreite die Solldicke besitzt, wird anschließend zu plattenförmigen Werkstoffen weiterverarbeitet.The particles are brought down onto the forming belt 11 as a veil via the opening rollers 17. Instead of the forming belt 11, a number of mutually overlapping documents 18 can also be provided, which, in the case of their flexible design, carry headers 19. The fleece 20 located on the documents 18 or the forming belt 11, which has the desired thickness over its spreading width, is then further processed into plate-shaped materials.

Fig. 2 zeigt schematisch die Stellung von Schiebern 22, die entsprechend dem, in diesem Bereich vorhandenen Vliesverlauf 23 über die Streubreite 24 überschüssige Partikel 5 in das Gehäuse 10 eintreten lassen und damit einer Förderschnecke 25 zuführen. Zugabeschieber 26 ermöglichen aus dem Gehäuse 10 heraus über die rotierende Förderschnecke 25 ein Zudosieren von Partikeln zum Vlies 20, wenn ein negativer Vliesverlauf 27 vorhanden ist. Die rotierende Förderschnecke 25 und das Gehäuse 10 sind über die Streubreite hinaus verlängert, so daß auch nach der Dosierung noch vorhandenes überschüssiges Partikelmaterial (Streupartikelübermenge) 28 durch eine Öffnung 29 im Gehäuse außerhalb der Streubreite 24 abgeführt werden kann und beispielsweise im Kreislauf wieder in den Bunker 1 (Fig. 1) zurückgeführt werden kann.2 schematically shows the position of slides 22 which, in accordance with the fleece course 23 present in this area, allow excess particles 5 to enter the housing 10 via the spreading width 24 and thus feed them to a screw conveyor 25. Adding slides 26 allow particles to be added to the fleece 20 from the housing 10 via the rotating screw conveyor 25 if a negative fleece course 27 is present. The rotating screw conveyor 25 and the housing 10 are extended beyond the spreading width, so that even after dosing, any excess particulate material (excess scattering particles) 28 can be discharged through an opening 29 in the housing outside the spreading width 24 and, for example, in the circuit back into the bunker 1 (Fig. 1) can be traced.

Fig. 3 zeigt ein Ausführungsbeispiel des Erfindungsgegenstandes in vergrößertem Maßstab. Der von den Kratzwalzen 6 ausgetragene geschlossene Partikelstrom 8 wird zwischen vorderer Umlenkung 9 des Bodenbandes 3 und dem Gehäuse 10 hindurchtransportiert. Das Gehäuse 10 besitzt einen kreisförmigen Teil 30, in dem mehrere Zugabeschieber 26, über die Streubreite angepaßt an die Kreisform, Zugabeschlitze 31 wahlweise verschließen oder öffnen können, je nach Information aus der Dickenmessung 13 im Vlies. Im Gehäuse 10 ist die rotierende Förderschnecke 25 als Fördereinrichtung vorgesehen. Im Ausführungsbeispiel gemäß Fig. 3 verschließt der in der Zeichenebene liegende Schieber 22 den Abnahmeschlitz 32. Durch den dahinterliegenden, geöffneten Schieber 22 tritt ein Teilpartikelstrom 33 in das Gehäuse 10 ein und wird, wie zu Fig. 2 bereits beschrieben, entweder an eine Stelle verbracht, an der ein negativer Vliesverlauf im Vlies vorhanden ist, oder es wird dieser Teilpartikelstrom 33 über die Öffnung 29 abgeführt. In Fig. 3 ist zu erkennen, daß das Gehäuse 10 im Randbereich der Ausdehnung des noch geschlossenen Partikelstroms in Vliesförderrichtung angeordnet ist.Fig. 3 shows an embodiment of the subject matter of the invention on an enlarged scale. The closed particle stream 8 discharged from the scraper rollers 6 is transported between the front deflection 9 of the floor belt 3 and the housing 10. The housing 10 has a circular part 30 in which a plurality of addition slides 26, adapted to the circular shape via the spreading width, can optionally close or open addition slots 31, depending on the information from the thickness measurement 13 in the fleece. In the housing 10, the rotating screw conveyor 25 is provided as a conveyor. In the exemplary embodiment according to FIG. 3, the slide 22 lying in the plane of the drawing closes the removal slot 32. A partial particle flow 33 enters the housing 10 through the open slide 22 behind it and, as already described for FIG. 2, is either moved to one place , on which there is a negative fleece course in the fleece, or this partial particle stream 33 is discharged via the opening 29. In Fig. 3 it can be seen that the housing 10 is arranged in the edge region of the expansion of the still closed particle flow in the nonwoven conveying direction.

Im Bereich des Gehäuses 10 und hinter diesem ist eine Leitklappe 34 angeordnet, die bewirkt, daß der dosierte Gesamtpartikelstrom gemeinsam im Vlies abgelegt wird.A guide flap 34 is arranged in the area of the housing 10 and behind it, which causes the metered total particle flow to be deposited together in the fleece.

Fig. 4a zeigt die Ausgestaltung eines Gehäuses in Sechseckform, bei dem parallele Seiten 35, 36 des Gehäuses durch Schieber 22 bzw. Zugabeschieber 26 wahlweise verschlossen und geöffnet werden können. Eine derartige Ausgestaltung des Gehäuses bringt von der mechanischen Führung der einzeln betätigbaren Schieber 22 und einzeln betätigbaren Zugabeschieber 26 eine Vereinfachung in der Herstellung und bei der Justierung.4a shows the configuration of a housing in the form of a hexagon, in which parallel sides 35, 36 of the housing can optionally be closed and opened by slides 22 or addition slides 26. Such a configuration of the housing simplifies the manufacture and adjustment of the mechanical guidance of the individually operable slides 22 and individually operable addition slides 26.

Die Fig. 4b zeigt ein quadratisches Gehäuse 10, bei dem die Schieber 22 und 26 aneinanderstoßende Seiten 37, 38, die mit Schlitzen versehen sind, wahlweise verschließen oder öffnen. Derartige Ausgestaltungen eignen sich insbesondere, wie auch in Fig. 1 dargestellt, für Einbauten des Gehäuses 10 und der Fördereinrichtung 12 im Bereich der Übergabewalzen 16 und Auflösewalzen 15.4b shows a square housing 10, in which the slides 22 and 26 selectively close or open adjacent sides 37, 38 which are provided with slots. Such configurations are particularly suitable, as also shown in FIG. 1, for installations of the housing 10 and the conveying device 12 in the region of the transfer rollers 16 and opening rollers 15.

In Fig. 4c ist in dem Gehäuse 10 eine entgegengesetzt gewendelte Förderschnecke 40 vorgesehen. Die entgegengesetzt gewendelte Förderschnecke 40 ist darüber hinaus um ein Maß 41 aus der Mitte 42 der Streubreite 24 verschiebbar. Die entgegengesetzte Wendelung beginnt in der Mitte der Förderschnecke 40, so daß links und rechts neben der Streubreite überschüssiges Partikelmaterial aus dem Gehäuse 10 über Offnungen 29 ausgetragen werden kann.4c, an oppositely coiled conveyor screw 40 is provided in the housing 10. The oppositely coiled screw conveyor 40 can also be displaced by a dimension 41 from the center 42 of the spreading width 24. The opposite spiral begins in the middle of the screw conveyor 40, so that excess particle material can be discharged from the housing 10 via openings 29 to the left and right of the spreading width.

Fig. 4d zeigt einen geschlossenen Überschußpartikelkreislauf. Ein im Gehäuse 10 angeordneter Kratzerförderer 43 oder ein Räumband 44 bewegen sich als endlose Förderorgane um zwei Umlenkstellen 45, 46. Das Gehäuse 10 besitzt in seinem Bodenteil 47 einen Schlitz über die gesamte Streubreite. Dieser Schlitz ist mittels mehrerer über die Schüttbreite angeordneter Zugabeschieber 26 verschließ- und öffenbar. Stromauf besitzt das Gehäuse 10 in einer Dachschräge 48 einen über die gesamte Streubreite verlaufenden Schlitz, der ebenfalls mit mehreren Schiebern 22 verschließbar ist. Damit kann eine Abnahme von Partikelmaterial stromauf und eine Partikelzugabe stromab vom selben Partikelstrom aus gesteuert werden, so daß im Vlies 20 über dessen Streubreite 24 gesehen, eine vorgegebene Solldichte erreichbar wird.4d shows a closed excess particle cycle. A scraper conveyor 43 arranged in the housing 10 or a clearing belt 44 move as endless conveying members around two deflection points 45, 46. The housing 10 has a slot in its bottom part 47 over the entire spreading width. This slot can be closed and opened by means of a plurality of addition slides 26 arranged over the bulk width. Upstream, the housing 10 has, in a roof slope 48, a slot which extends over the entire spreading width and which can likewise be closed with a plurality of slides 22. A decrease in particle material upstream and a particle addition downstream from the same particle stream can thus be controlled, so that a predetermined target density can be achieved in the fleece 20 over its spreading width 24.

Claims (9)

1. Control method for continuously maintaining constant a predetermined layer height of a particle layer, with particle flows sprayed from a paddle roller, converted into particle fog from which partial positioned flows are taken off before a scattering head, characterised in that, for continuously maintaining constant the layer height (13) across the layer width and layer length, a division of the scatter head across the flow direction of a conveyer belt is achieved for receiving of the layer in a plurality of sections that a remote controlled reception and release of particles out of and into the particle fog (8) is achieved in each section, that a continuous measurement (13) of the layer height of the deposited layer (20) is achieved and that a desired/actual value comparison and a setting value determination is carried out by a calculator.
2. Apparatus for formation of a particle layer (20) having a particle hopper (1) with paddle discharge (4) and ejection for forming across the width (24) of a moving mould belt, a free falling particle flow (8), with a plurality of control devices positioned transverse to the flow direction in the area of the particle flow, for taking off partial flows from the particle flow across the width (24) of the particle layer (20) to be deposited on the mould belt (11), and a conveying apparatus for return of the parti- des taken off into the particle hopper, characterised in that at least one device for the adjustment of the distribution of thickness is positioned transverse to the line of the mould belt, which consists of a conveying apparatus (12, 25) covered by a casing (10), that two rows of control apparatus are provided, which are positioned at two different surface lines of the casing (10) of the conveying apparatus (12, 25) the first row being positioned at a surface line against which the particle flow (8) is incident and the second row being positioned at a surface line which runs at the underneath part of the casing (10) that the control apparatus consist of receiving slides (22) at receiving slits (32), and supply slides (26) at supply slits (31) in the surface of the casing (10) of the conveyor apparatus; that a measurement of layer height (13) is carried out in each individual section, produced by the plurality of slides (22, 26), on the layer deposited on the mould belt (20); and that a regulatory device is provided which controls by means of a calculator the layer height according to the measured layer height across the layer width (24) in the deposited particle layer (20) and controls the setting of the removal slide (22) and the supply slide (26) corresponding to a desired thickness distribution.
3. Device as claimed in claim 2, characterised in that a driven removal belt (44) or a paddle conveyor (43), forming an endless conveyor, extends across the scattering width (24).
4. Device as claimed in claim 2, characterised in that a rotating spiral conveyor extends across the scattering width (24).
5. Device as claimed in claim 2, characterised in that across the scattering width (24) extend two countercurrent rotating spiral conveyors (25) or extends one spiral conveyor (40) (right/left spiral) with opposed spirals leading from the middle outwards.
6. Device as claimed in any one of claims 2 to 5, characterised in that the conveying apparatus which extends across the scattering width supplies the excess particle flow (28) through an opening (29) in the casing (10) for reuse.
7. Device as claimed in any one of claims 2 to 6, characterised in that the casing has a circular part (30) downstream in which a slit (31) running in the direction of a surface line can be closed off by moving supply slides (26), controllable from outside, which fit the circular form of the casing (10), arranged next to one another in the direction of the scattering width, that the casing has a receiving slit upstream extending across the scattering width (24) which can be closed by an individually controllable flat slides (22) arranged in the direction of the scattering width (24).
8. Device as claimed in any one of claims 2 to 7, characterised in that the cross section of the casing is a polygon, that the upstream side (35 or 37) of the polygon can be closed with several individually controllable slides (22) arranged in the direction of the scattering width (24) and that the side (36, 38) of the polygon facing downstream can likewise be closed with several individually controllable supply slides (26) in the direction of the scattering width (24).
9. Device as claimed in any one of the claims 2 to 8, characterised in that one of the respective measuring agents (13) corresponding to the width of the slide, which determines the actual density of the particle layer compares this value with the desired value in a calculator; that the control value formed from this, in the case of the desired value being exceeded opens the corresponding slide (22) upstream while closing the corresponding supply slide downstream and in the case of the desired value being underacheived, opens the corresponding supply slide (26) downstream the corresponding slide (22) upstream being first closed.
EP86100658A 1986-01-20 1986-01-20 Process for uniforming spread particles and device for performing the process Expired - Lifetime EP0230483B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP86100658A EP0230483B1 (en) 1986-01-20 1986-01-20 Process for uniforming spread particles and device for performing the process
DE8686100658T DE3669838D1 (en) 1986-01-20 1986-01-20 METHOD FOR COMPARISONING SPREADING PARTICLES, AND A DEVICE FOR IMPLEMENTING THE METHOD.
US07/001,706 US4703783A (en) 1986-01-20 1987-01-09 Apparatus for equalizing the deposition of a particle mass

Applications Claiming Priority (1)

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EP86100658A EP0230483B1 (en) 1986-01-20 1986-01-20 Process for uniforming spread particles and device for performing the process

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EP0230483A1 EP0230483A1 (en) 1987-08-05
EP0230483B1 true EP0230483B1 (en) 1990-03-28

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US4703783A (en) 1987-11-03
EP0230483A1 (en) 1987-08-05

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