EP2125312B1 - Dispersion installation - Google Patents

Dispersion installation Download PDF

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Publication number
EP2125312B1
EP2125312B1 EP08707444.9A EP08707444A EP2125312B1 EP 2125312 B1 EP2125312 B1 EP 2125312B1 EP 08707444 A EP08707444 A EP 08707444A EP 2125312 B1 EP2125312 B1 EP 2125312B1
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EP
European Patent Office
Prior art keywords
spreading material
spiked
accordance
bunker
combs
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EP08707444.9A
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German (de)
French (fr)
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EP2125312A1 (en
Inventor
Ralf Burckhardt
Jörg PUDEG
Friedhelm SCHLÜPEN
Klaus Wollny
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Siempelkamp Maschinen und Anlagenbau GmbH and Co KG
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Siempelkamp Maschinen und Anlagenbau GmbH and Co KG
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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 grit plant according to claim 1 for scattering (glued) grit on a Streuband makeuper to form grit mats for the production of wood-based panels or in the course of the production of wood-based panels with at least one grit hopper for the sprinkler to be sprinkled on the grit, which at least one having top filling opening, wherein (above) to the filling opening a chute is connected, via which the grit enters the grit hopper.
  • - Wood-based panels means in the invention fiberboard, z. B. MDF (Medium Density Fiber) plates. Scattering means fibers, z. B. MDF fibers.
  • Such a grit bunker is designed as a horizontal bunker, which a bottom-side dosing as well as a dosing the end-assigned discharge, z. B. Austragswalzenfront with multiple discharge rollers for discharging grit on the scatter band conveyor.
  • the scatter belt conveyor is usually arranged below the grit hopper.
  • such a grit bunker usually has an upper conveyor z. B. scratches, which initially conveys the grit entering the bunker in the rear of the grit hopper. This is to ensure that the grit bin works on the principle of "first in - first out". This is especially in the processing of glued grit, z. B.
  • the bottom-side metering belt is also referred to as bunker bottom belt.
  • the dosing belt speed With the dosing belt speed, the volumetric flow of the material to be spread out of the spreading material bunker can be adjusted.
  • the filling is usually carried out via a filling device, which may have one or more cyclones and thus pneumatic feeders. These cyclones are usually end or bottom with a Provided with rotary valve. About this rotary valve, the grit is output and then fed to the chute with the interposition of various components, so that it enters the bunker.
  • Grit systems of the type described above are known from practice in various embodiments. They have basically proven themselves. It is of particular importance that with the help of such a grit plant grit mats perfect quality and in particular uniform spreading material distribution are applied to the scatter belt conveyor. For this reason, it is known not to sprinkle the grit from the grit hopper directly on the scattering band, but first on a scattering head, which may be formed, for example, as Streuwalzen Identification and should ensure a uniform spreading of the grit. Moreover, it is known in this context to provide a Streugutverdichtungsierlöser between the Austragswalzenan extract the grit hopper and the scattering head or the Streuwalzenée, which has two opening rollers (see. DE 43 02 850 C2 ).
  • a grit plant with horizontal bunker for producing grit mats is also known (see. DE 100 50 433 ).
  • the invention has for its object to provide a grit system of the type described above, which allows the production of flawless grit mats with a simple and inexpensive construction and proper operation.
  • the invention teaches in a generic grit system of the type described above, that within the chute associated with the filling opening (in the fiber stream) at least one Brake roller device is arranged, which has at least two rotationally driven brake rollers.
  • the brake rollers are spaced by a predetermined amount and arranged with parallel axes, so that they do not mesh.
  • the brake rollers are arranged approximately at the same die and consequently next to each other.
  • the invention is based on the recognition that the quality of the grit mats generated in such a grit plant depends not only on the structure of the operation of the grit hopper, its Austragswalzenfront and in particular the scattering head, but also that the way of filling the grit hopper on an influence the distribution of the material to be spread on the Streubutbunker downstream Streuband makeuper has or may have.
  • the invention has recognized that it is possible to produce high-quality spreading material mats when the spreading material does not enter the bunker unrestrained via the chute, but when a braking roller device with a plurality of rotating braking rollers is arranged above the bunker entry and consequently in the chute.
  • the brake roller device has at least two brake rollers, of which one or more or all brake rollers are formed as spiked rollers with a plurality of substantially radially aligned spines.
  • the spiked rollers can have a plurality of spiked combs which are fastened to a shaft and extend essentially over the width of the roller, which are arranged in pairs at a predetermined angle ⁇ relative to one another.
  • Particularly suitable in terms of manufacturing technology is a preferred embodiment of the invention, in which the spiked combs are formed by individual spiked plates which, for example, can each be manufactured in one piece.
  • a spiked roller or several or all spiked rollers two to ten, preferably four to eight, z. B. has six individual spiked combs, which then together form the spiked roller.
  • the individual spiked combs are then on the shaft as it were "equidistant" or arranged at the same angle to each other.
  • the angle between two adjacent spiked combs in each case about 60 °.
  • each case two adjacent spiked combs are arranged offset in the wavelength direction by a predetermined amount (relative to the spines) with respect to one another.
  • the offset between two adjacent spiked combs may preferably be approximately half the distance of the individual spines of a spiked comb. This means that two adjacent spiked combs are arranged as it were "on the gap", so that overall a particularly reliable braking effect and turbulence of the fibers is ensured.
  • each individual brake roller of the brake roller device assigned a separate roller drive for example is designed as an electric motor, possibly with gear.
  • the invention also encompasses embodiments in which a plurality of brake rollers or all the brake rollers are driven by a common drive, possibly with the interposition of one or more transmissions. In any case, it is within the scope of the invention that the brake rollers are driven at the same speed, for. B. synchronously.
  • Streugutverteil may for example be a pendulum chute or the like, with which it is ensured that the grit is distributed by the pendulum movement of a groove or a pipe or the like over the cross section of the chute.
  • pendulum chutes are basically known in this context.
  • the invention has recognized that by combining such a per se known pendulum chute with the brake roller device according to the invention a particularly good filling of a bunker succeeds, which has a particularly positive effect on the quality of the produced grit mats.
  • the measures according to the invention result from the uniform distribution of the material to be spread on the spreading belt conveyor for producing homogeneous spreading material mats, which in turn has an effect on the quality of the pressed fiber boards from the spreading material mats. This is especially in connection with the production of thin wood-based panels, z. As thin MDF boards of importance, since in the production of thin plates, the quality of the grit material produced is of great importance.
  • a grit plant for scattering grit on a scatter belt conveyor 1 to form grit mats 2 for the production of wood-based panels is shown in fragmentary form.
  • the spreading material may in particular be MDF fibers for the production of MDF boards.
  • This grit plant has a grit hopper 3 for the scattered material to be sprinkled on the scatter belt conveyor 1.
  • This grit hopper 3 has an upper-side filling opening 4, via which the (glued) grit is filled into the bunker 3.
  • a chute 5 is connected to the top of the filling opening 4, via which the grit enters the grit hopper 3.
  • the grit hopper 3 is formed as a horizontal bunker with a bottom-side dosing belt 6, which is also referred to as bunker bottom band.
  • the dosing belt 6 is followed by a discharge device, which is designed as a discharge roller front 7 with a plurality of discharge rollers.
  • a discharge device which is designed as a discharge roller front 7 with a plurality of discharge rollers.
  • an upper conveyor is indicated, which acts as a scratch, z. B. chain scraper 8 is formed.
  • the working directions of the dosing belt 6 on the one hand and the scraper 8 on the other hand are also indicated. In this respect it can be seen that the Spreading material on the chute 5 enters the area of the scraper 8 and is transported from there first to the rear of the bunker 3.
  • the dosing belt 6 From there it passes via the dosing belt 6 into the region of the discharge roller front 7, which discard the spreading material from the bunker 3 onto the scatter belt conveyor 1 arranged below the bunker 3. It can be seen that the grit from the bunker does not impinge directly on the scatter belt conveyor 1, but that on the Austragswalzenfront 7 the grit first hits once on a scattering head 9, which is formed in the embodiment as Streuwalzen Identification with a plurality of scattering rollers. From there, the grit passes to form the grit mat 2 on the scatter belt conveyor 1. Typically, the scattering head 9 different mat treatment facilities are arranged downstream, z. As a Egalisiertechnik and / or a pre-press before the grit mat enters the hot press.
  • Fig. 1 merely indicated that the grit enters the chute via a grit feeding device 10.
  • This can have one or more cyclones with end-side rotary valves and / or other conveyors, screws or the like. Details are not shown in the figures.
  • a brake roller device 11 which has two rotationally driven brake rollers 12, is arranged within the chute 5 and consequently in the fiber flow.
  • the brake rollers 12 spaced by a predetermined amount M to each other with mutually parallel axes a arranged.
  • Distance M of the brake rollers 12 means here in Fig. 2 indicated distance M of the "perimeters" of the brake rollers.
  • Fig. 2 is indicated that the brake rollers 12 rotate in opposite directions. In that regard, it is merely an example.
  • the brake rollers 12 are formed as spiked rollers, each having a plurality of spikes 13, which extend substantially in the radial direction.
  • each spiked roller 12 has a plurality of spiked combs 15 fastened to the shaft 14 and extending over the entire width of the spiked roller 12.
  • Fig. 6 shows, that these individual spiked combs 15 are each arranged in pairs at a predetermined angle ⁇ to each other.
  • Each of these spiked combs 15 is formed as a one-piece manufactured spiked plate.
  • the individual spiked plates 15 are screwed to the shaft 14 and thus releasably connected to the shaft.
  • FIG. 5 A comparative analysis of the Fig. 5 and 6 shows, moreover, that each two adjacent spiked combs 15 are offset from one another.
  • Staggered means offset relative to the individual spines in the longitudinal direction of the shaft.
  • the offset x between two adjacent spiked plates in the exemplary embodiment is approximately half the distance y of two adjacent spines 13 of a spiked plate 15, so that the in Fig. 5 indicated arrangement "gap" results.
  • each spiked roller 12 is associated with its own drive 16, which may be designed as an electric motor drive 16.
  • a known pendulum chute 17 is provided, which may be formed as a movable groove or movable piece of pipe and by a pendulum motion ensures a distributed loading of the chute 5 with grit.
  • the interaction of this pendulum chute 17 with the brake rollers 12 according to the invention leads to particularly good results.
  • the width of the spiked rollers extends approximately over the entire width of the chute. It corresponds approximately to the width of the grit bunker.
  • a brake roller 12 shown in the figures may have a width b of, for example, 2.5 to 3 m, wherein the radius r, for example, 50 to 80 cm, z. B. is 60 to 70 cm. Every single spiked plate 15 has z. B. 20 to 40, z. B. 25 to 35 spikes, a distance y of 5 to 15 cm, z. B. 8 to 10 cm may have.
  • the rotational speed of one or both rolls may be 5 to 100 revolutions per minute, preferably 6 to 60 revolutions per minute, e.g. B. 30 revolutions per minute.

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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)
  • Preliminary Treatment Of Fibers (AREA)

Description

Die Erfindung betrifft eine Streugutanlage gemäss Anspruch 1 zum Streuen von (beleimtem) Streugut auf einem Streubandförderer unter Bildung von Streugutmatten für die Herstellung von Holzwerkstoffplatten bzw. im Zuge der Herstellung von Holzwerkstoffplatten mit zumindest einem Streugutbunker für das auf den Streugutförderer aufzustreuende Streugut, welcher zumindest eine oberseitige Füllöffnung aufweist, wobei (oberhalb) an die Füllöffnung ein Fallschacht angeschlossen ist, über welchen das Streugut in den Streugutbunker eintritt. - Holzwerkstoffplatten meint im Rahmen der Erfindung Faserplatten, z. B. MDF-Platten (Medium Density Fiber). Streugut meint Fasern, z. B. MDF-Fasern. Ein solcher Streugutbunker ist als Horizontalbunker ausgebildet, welcher ein bodenseitiges Dosierband so wie eine dem Dosierband endseitig zugeordnete Austragsvorrichtung, z. B. Austragswalzenfront mit mehreren Austragswalzen zum Austragen von Streugut auf den Streubandförderer aufweist. Der Streubandförderer ist dabei üblicherweise unterhalb des Streugutbunkers angeordnet. Im oberen Bereich weist ein solcher Streugutbunker üblicherweise einen oberen Förderer z. B. Kratzer auf, welcher das in den Bunker eintretende Streugut zunächst in den hinteren Bereich des Streugutbunkers befördert. Damit soll gewährleistet werden, dass der Streugutbunker nach dem Prinzip "First in - First out" arbeitet. Dieses ist insbesondere bei der Verarbeitung von beleimten Streugut, z. B. beleimten MDF-Fasern von Bedeutung, damit die zuerst in den Streugutbunker eintretenden Fasern auch zuerst wieder aus diesem entnommen und auf den Streugutförderer gestreut werden. Das bodenseitige Dosierband wird auch als Bunkerbodenband bezeichnet. Mit der Dosierbandgeschwindigkeit lässt sich der aus dem Streugutbunker ausgetragene Volumenstrom des Streugutes einstellen. Die Befüllung erfolgt üblicherweise über eine Füllvorrichtung, die einen oder mehrere Zyklone und folglich pneumatische Zuförderer aufweisen kann. Diese Zyklone sind üblicherweise endseitig bzw. unterseitig mit einer Zellradschleuse versehen. Über diese Zellradschleuse wird das Streugut ausgegeben und dann unter Zwischenschaltung verschiedenster Komponenten dem Fallschacht zugeführt, so dass es in den Bunker eintritt.The invention relates to a grit plant according to claim 1 for scattering (glued) grit on a Streubandförderer to form grit mats for the production of wood-based panels or in the course of the production of wood-based panels with at least one grit hopper for the sprinkler to be sprinkled on the grit, which at least one having top filling opening, wherein (above) to the filling opening a chute is connected, via which the grit enters the grit hopper. - Wood-based panels means in the invention fiberboard, z. B. MDF (Medium Density Fiber) plates. Scattering means fibers, z. B. MDF fibers. Such a grit bunker is designed as a horizontal bunker, which a bottom-side dosing as well as a dosing the end-assigned discharge, z. B. Austragswalzenfront with multiple discharge rollers for discharging grit on the scatter band conveyor. The scatter belt conveyor is usually arranged below the grit hopper. In the upper area, such a grit bunker usually has an upper conveyor z. B. scratches, which initially conveys the grit entering the bunker in the rear of the grit hopper. This is to ensure that the grit bin works on the principle of "first in - first out". This is especially in the processing of glued grit, z. B. glued MDF fibers of importance, so that the first entering the grit hopper fibers are also first removed from this and scattered on the grit conveyor. The bottom-side metering belt is also referred to as bunker bottom belt. With the dosing belt speed, the volumetric flow of the material to be spread out of the spreading material bunker can be adjusted. The filling is usually carried out via a filling device, which may have one or more cyclones and thus pneumatic feeders. These cyclones are usually end or bottom with a Provided with rotary valve. About this rotary valve, the grit is output and then fed to the chute with the interposition of various components, so that it enters the bunker.

Streugutanlagen der eingangs beschriebenen Art sind aus der Praxis in unterschiedlichsten Ausführungsformen bekannt. Sie haben sich grundsätzlich bewährt. Dabei ist von besonderer Bedeutung, dass mit Hilfe einer solchen Streugutanlage Streugutmatten einwandfreier Qualität und insbesondere gleichmäßiger Streugutverteilung auf den Streubandförderer aufgebracht werden. Aus diesem Grunde ist es bekannt, das Streugut aus dem Streugutbunker nicht unmittelbar auf das Streuband aufzustreuen, sondern zunächst auf einen Streukopf, der beispielsweise als Streuwalzenstraße ausgebildet sein kann und für ein gleichmäßiges Aufstreuen des Streugutes sorgen soll. Außerdem ist es in diesem Zusammenhang bekannt, zwischen der Austragswalzenanordnung des Streugutbunkers und dem Streukopf bzw. der Streuwalzenstraße einen Streugutverdichtungsauflöser vorzusehen, der dazu zwei Auflösewalzen aufweist (vgl. DE 43 02 850 C2 ).Grit systems of the type described above are known from practice in various embodiments. They have basically proven themselves. It is of particular importance that with the help of such a grit plant grit mats perfect quality and in particular uniform spreading material distribution are applied to the scatter belt conveyor. For this reason, it is known not to sprinkle the grit from the grit hopper directly on the scattering band, but first on a scattering head, which may be formed, for example, as Streuwalzenstraße and should ensure a uniform spreading of the grit. Moreover, it is known in this context to provide a Streugutverdichtungsauflöser between the Austragswalzenanordnung the grit hopper and the scattering head or the Streuwalzenstraße, which has two opening rollers (see. DE 43 02 850 C2 ).

Ferner kennt man eine Vorrichtung zum Erzeugen von Streugutmatten, bei welcher das Streugut von einem bzw. mehreren Förderern über eine Faserverteil- bzw. Auflösevorrichtung auf den Streubandförderer aufgestreut wird. Diese Vorrichtung zum Auflockern bzw. Verteilen von Fasern ist unmittelbar oberhalb des Streubandförderers angeordnet und weist zwei übereinander angeordnete Walzenpaare auf, die mit umfangsseitig angeordneten, ineinandergreifenden Elementen gegensinnig rotieren (vgl. US 3,252,186 ).Furthermore, there is known a device for producing spreading material mats, in which the spreading material is scattered by one or more conveyors on the scattering belt conveyor via a fiber distribution or opening device. This device for loosening or distributing fibers is arranged directly above the scatter band conveyor and has two superimposed pairs of rollers which rotate in opposite directions with circumferentially arranged, interlocking elements (see. US 3,252,186 ).

Eine Streugutanlage mit Horizontalbunker zum Erzeugen von Streugutmatten ist ebenfalls bekannt (vgl. DE 100 50 433 ).A grit plant with horizontal bunker for producing grit mats is also known (see. DE 100 50 433 ).

Der Erfindung liegt die Aufgabe zugrunde, eine Streugutanlage der eingangs beschriebenen Art zu schaffen, welche bei einfachem und kostengünstigen Aufbau und einwandfreier Funktionsweise die Erzeugung einwandfreier Streugutmatten ermöglicht.The invention has for its object to provide a grit system of the type described above, which allows the production of flawless grit mats with a simple and inexpensive construction and proper operation.

Zur Lösung dieser Aufgabe lehrt die Erfindung bei einer gattungsgemäßen Streugutanlage der eingangs beschriebenen Art, dass innerhalb des der Füllöffnung zugeordneten Fallschachtes (im Faserstrom) zumindest eine Bremswalzeneinrichtung angeordnet ist, welche zumindest zwei rotierend angetriebene Bremswalzen aufweist. Die Bremswalzen sind dabei um ein vorgegebenes Maß beabstandet und mit parallelen Achsen angeordnet, so dass sie nicht ineinandergreifen. Die Bremswalzen sind in etwa auf gleicher Die und folglich nebeneinander angeordnet.To solve this problem, the invention teaches in a generic grit system of the type described above, that within the chute associated with the filling opening (in the fiber stream) at least one Brake roller device is arranged, which has at least two rotationally driven brake rollers. The brake rollers are spaced by a predetermined amount and arranged with parallel axes, so that they do not mesh. The brake rollers are arranged approximately at the same die and consequently next to each other.

Die Erfindung geht von der Erkenntnis aus, dass die Qualität der in einer solchen Streugutanlage erzeugten Streugutmatten nicht nur von dem Aufbau der Funktionsweise des Streugutbunkers, seiner Austragswalzenfront und insbesondere dem Streukopf abhängt, sondern dass auch die Art und Weise der Befüllung des Streugutbunkers einen Einfluss auf die Verteilung des Streugutes auf den dem Streugutbunker nachgeordneten Streubandförderer hat bzw. haben kann. Dabei hat die Erfindung erkannt, dass sich Streugutmatten hoher Qualität erzeugen lassen, wenn das Streugut über den Fallschacht nicht ungebremst in den Bunker eintritt, sondern wenn oberhalb des Bunkereintrittes und folglich im Fallschacht eine Bremswalzeneinrichtung mit mehreren rotierenden Bremswalzen angeordnet ist. Diese reduziert nicht nur die Geschwindigkeit der durch den Fallschacht fallenden Fasern, sondern sorgt darüber hinaus auch für eine Verwirbelung bzw. Verteilung der Fasern, so dass Verdichtungen des Streugutes, die beim Auftreffen des Streugutes in den Bunker auftreten können, zuverlässig vermieden werden. Dabei ist nicht erforderlich, dass die Bremswalzen in an sich bekannter Weise ineinandergreifen, um eventuelle Verdichtungen im Streugut aufzulösen, sondern im Rahmen der Erfindung sind die Walzen beabstandet voneinander angeordnet. Auf diese Weise wird ein hoher Durchsatz gewährleistet. Dennoch wird durch die kombinierte Brems- und Verteilwirkung überraschenderweise eine lockere und gleichmäßige bzw. homogene Befüllung des Bunkers erzeugt, die sich in besonders überraschender Weise auf die Verteilung des Streugutes auf dem den Bunker nachgeordneten Streubandförderer auswirken kann.The invention is based on the recognition that the quality of the grit mats generated in such a grit plant depends not only on the structure of the operation of the grit hopper, its Austragswalzenfront and in particular the scattering head, but also that the way of filling the grit hopper on an influence the distribution of the material to be spread on the Streubutbunker downstream Streubandförderer has or may have. The invention has recognized that it is possible to produce high-quality spreading material mats when the spreading material does not enter the bunker unrestrained via the chute, but when a braking roller device with a plurality of rotating braking rollers is arranged above the bunker entry and consequently in the chute. This not only reduces the speed of falling through the chute fibers, but also provides for a swirling or distribution of the fibers, so that compaction of the material to be spread, which may occur when hitting the material to be spread into the bunker be reliably avoided. It is not necessary that the brake rollers interlock in a conventional manner to dissolve any compaction in the grit, but in the invention, the rollers are spaced from each other. This ensures high throughput. Nevertheless, the combined braking and distribution effect surprisingly produces a loose and uniform or homogeneous filling of the bunker, which can have a particularly surprising effect on the distribution of the material to be spread on the scattering belt conveyor downstream of the bunker.

In bevorzugter Weiterbildung weist die Bremswalzenvorrichtung zumindest zwei Bremswalzen auf, von denen eine oder auch mehrere bzw. alle Bremswalzen als Stachelwalzen mit einer Vielzahl von im Wesentlichen radial ausgerichteten Stacheln ausgebildet sind. Die Stachelwalzen können dazu mehrere an einer Welle befestigte und sich im Wesentlichen über die Breite der Walze erstreckende Stachelkämme aufweisen, die jeweils paarweise unter einem vorgegebenen Winkel α zueinander angeordnet sind. Fertigungstechnisch besonders zweckmäßig ist eine bevorzugte Ausführungsform der Erfindung, bei welcher die Stachelkämme von einzelnen Stachelblechen gebildet sind, die beispielsweise jeweils einstückig gefertigt sein können.In a preferred development, the brake roller device has at least two brake rollers, of which one or more or all brake rollers are formed as spiked rollers with a plurality of substantially radially aligned spines. To this end, the spiked rollers can have a plurality of spiked combs which are fastened to a shaft and extend essentially over the width of the roller, which are arranged in pairs at a predetermined angle α relative to one another. Particularly suitable in terms of manufacturing technology is a preferred embodiment of the invention, in which the spiked combs are formed by individual spiked plates which, for example, can each be manufactured in one piece.

Es liegt im Rahmen der Erfindung, dass eine Stachelwalze bzw. mehrere oder alle Stachelwalzen zwei bis zehn, vorzugsweise vier bis acht, z. B. sechs einzelne Stachelkämme aufweist, welche dann gemeinsam die Stachelwalze bilden. Die einzelnen Stachelkämme sind dann an der Welle gleichsam "äquidistant" bzw. mit gleichem Winkel zueinander angeordnet. Bei einer Ausführungsform mit z. B. sechs Stachelkämmen beträgt der Winkel zwischen zwei benachbarten Stachelkämmen jeweils in etwa 60°.It is within the scope of the invention that a spiked roller or several or all spiked rollers two to ten, preferably four to eight, z. B. has six individual spiked combs, which then together form the spiked roller. The individual spiked combs are then on the shaft as it were "equidistant" or arranged at the same angle to each other. In one embodiment with z. B. six spiked combs, the angle between two adjacent spiked combs in each case about 60 °.

Nach einem weiteren Vorschlag der Erfindung, dem besondere Bedeutung zukommt, sind jeweils zwei benachbarte Stachelkämme in Wellenlängsrichtung um ein vorgegebenes Maß (bezogen auf die Stacheln) versetzt zueinander angeordnet. Der Versatz zwischen zwei benachbarten Stachelkämmen kann vorzugsweise in etwa die Hälfte des Abstandes der einzelnen Stacheln eines Stachelkamms betragen. Das bedeutet, dass zwei benachbarte Stachelkämme gleichsam "auf Lücke" angeordnet sind, so dass insgesamt eine besonders zuverlässige Bremswirkung und Verwirbelung der Fasern gewährleistet ist.According to a further proposal of the invention, which is of particular importance, in each case two adjacent spiked combs are arranged offset in the wavelength direction by a predetermined amount (relative to the spines) with respect to one another. The offset between two adjacent spiked combs may preferably be approximately half the distance of the individual spines of a spiked comb. This means that two adjacent spiked combs are arranged as it were "on the gap", so that overall a particularly reliable braking effect and turbulence of the fibers is ensured.

Ferner ist es zweckmäßig, wenn die einzelnen Stachelkämme, z. B. Stachelbleche, lösbar an der Welle befestigt sind, z. B. mit der Welle verschraubt bzw. auf die Welle aufgesteckt sind. Dieses ist insbesondere für Wartungs- und/oder Reinigungszwecke vorteilhaft.Furthermore, it is expedient if the individual spiked combs, z. B. spiked plates, releasably secured to the shaft, z. B. bolted to the shaft or plugged onto the shaft. This is particularly advantageous for maintenance and / or cleaning purposes.

Ferner schlägt die Erfindung vor, dass jeder einzelnen Bremswalze der Bremswalzenvorrichtung ein eigener Walzenantrieb zugeordnet, der beispielsweise als Elektromotor, ggf. mit Getriebe ausgebildet ist. Auf diese Weise besteht grundsätzlich die Möglichkeit, die einzelnen Bremswalzen einer Bremswalzenvorrichtung unabhängig voneinander bzw. mit unterschiedlichen Geschwindigkeiten/Drehzahlen anzutreiben. In diesem Zusammenhang ist es besonders vorteilhaft, wenn die Bremswalzen bzw. zwei benachbarte Bremswalzen gegensinnig rotieren. Die Erfindung umfasst aber auch Ausführungsformen, bei welchen mehrere Bremswalzen bzw. alle Bremswalzen von einem gemeinsamen Antrieb ggf. unter Zwischenschaltung eines oder mehrerer Getriebe, angetrieben werden. In jedem Fall liegt es im Rahmen der Erfindung, dass die Bremswalzen mit derselben Geschwindigkeit angetrieben werden, z. B. synchron.Furthermore, the invention proposes that each individual brake roller of the brake roller device assigned a separate roller drive, for example is designed as an electric motor, possibly with gear. In principle, it is possible in this way to drive the individual brake rollers of a brake roller device independently of one another or at different speeds / rotational speeds. In this context, it is particularly advantageous if the brake rollers or two adjacent brake rollers rotate in opposite directions. However, the invention also encompasses embodiments in which a plurality of brake rollers or all the brake rollers are driven by a common drive, possibly with the interposition of one or more transmissions. In any case, it is within the scope of the invention that the brake rollers are driven at the same speed, for. B. synchronously.

Besonders bevorzugt ist eine Ausführungsform der Erfindung, bei welcher in dem Fallschacht oder oberhalb des Fallschachtes eine der Bremswalzenvorrichtung vorgeordnete Streugutverteileinrichtung angeordnet ist. Bei dieser Streugutverteileinrichtung kann es sich beispielsweise um eine Pendelschurre oder dergleichen handeln, mit welcher gewährleistet wird, dass das Streugut durch die Pendelbewegung einer Rinne oder eines Rohres oder dergleichen über den Querschnitt des Fallschachtes verteilt wird. Derartige Pendelschurren sind in diesem Zusammenhang grundsätzlich bekannt. Die Erfindung hat jedoch erkannt, dass durch Kombination einer solchen an sich bekannten Pendelschurre mit der erfindungsgemäßen Bremswalzenvorrichtung eine besonders gute Befüllung eines Bunkers gelingt, die sich besonders positiv auf die Qualität der erzeugten Streugutmatten auswirkt.Particularly preferred is an embodiment of the invention in which in the chute or above the chute one of the brake roller device upstream Streugutverteileinrichtung is arranged. In this Streugutverteileinrichtung may for example be a pendulum chute or the like, with which it is ensured that the grit is distributed by the pendulum movement of a groove or a pipe or the like over the cross section of the chute. Such pendulum chutes are basically known in this context. However, the invention has recognized that by combining such a per se known pendulum chute with the brake roller device according to the invention a particularly good filling of a bunker succeeds, which has a particularly positive effect on the quality of the produced grit mats.

Die erfindungsgemäßen Maßnahmen führen durch die gleichmäßige Verteilung des Streugutes auf dem Streubandförderer zur Erzeugung homogener Streugutmatten, was sich wiederum auf die Qualität der aus den Streugutmatten verpressten Faserplatten auswirkt. Dieses ist insbesondere im Zusammenhang mit der Fertigung dünner Holzwerkstoffplatten, z. B. dünner MDF-Platten von Bedeutung, da bei der Erzeugung dünner Platten die Qualität der erzeugten Streugutmatte von besonders großer Bedeutung ist.The measures according to the invention result from the uniform distribution of the material to be spread on the spreading belt conveyor for producing homogeneous spreading material mats, which in turn has an effect on the quality of the pressed fiber boards from the spreading material mats. This is especially in connection with the production of thin wood-based panels, z. As thin MDF boards of importance, since in the production of thin plates, the quality of the grit material produced is of great importance.

Im Folgenden wird die Erfindung anhand einer lediglich ein Ausführungsbeispiel darstellenden Zeichnung näher erläutert. Es zeigen:

Fig. 1
eine erfindungsgemäße Streugutanlage in einer Seitenansicht,
Fig. 2
einen Ausschnitt aus der Vorrichtung gemäß Fig. 1,
Fig. 3
eine Ansicht des Gegenstandes nach Fig. 2 aus Richtung des Pfeils A,
Fig. 4
eine Ansicht des Gegenstandes nach Fig. 2 aus Richtung des Pfeils B,
Fig. 5
eine Stachelwalze der Vorrichtung gemäß Fig. 4 und
Fig. 6
einen Schnitt A-A durch den Gegenstand nach Fig. 5.
In the following the invention will be explained in more detail with reference to a drawing showing only one exemplary embodiment. Show it:
Fig. 1
a grit plant according to the invention in a side view,
Fig. 2
a section of the device according to Fig. 1 .
Fig. 3
a view of the object after Fig. 2 from the direction of the arrow A,
Fig. 4
a view of the object after Fig. 2 from the direction of arrow B,
Fig. 5
a spiked roller of the device according to Fig. 4 and
Fig. 6
a section AA through the object after Fig. 5 ,

In den Figuren ist eine Streugutanlage zum Streuen von Streugut auf einen Streubandförderer 1 unter Bildung von Streugutmatten 2 für die Herstellung von Holzwerkstoffplatten ausschnittsweise dargestellt. Bei dem Streugut kann es sich insbesondere um MDF-Fasern für die Erzeugung von MDF-Platten handeln. Diese Streugutanlage weist einen Streugutbunker 3 für das auf den Streubandförderer 1 aufzustreuende Streugut auf. Dieser Streugutbunker 3 weist eine oberseitige Füllöffnung 4 auf, über welche das (beleimte) Streugut in den Bunker 3 eingefüllt wird. Dazu ist an die Füllöffnung 4 oberseitig ein Fallschacht 5 angeschlossen, über welchen das Streugut in den Streugutbunker 3 eintritt. Der Streugutbunker 3 ist als Horizontalbunker mit einem bodenseitigen Dosierband 6 ausgebildet, welches auch als Bunkerbodenband bezeichnet wird. Endseitig schließt sich an das Dosierband 6 eine Austragsvorrichtung an, die als Austragswalzenfront 7 mit mehreren Austragswalzen ausgebildet ist. Im oberen Bereich des Bunkers 3 ist ein oberer Förderer angedeutet, der als Kratzer, z. B. Kettenkratzer 8 ausgebildet ist. Die Arbeitsrichtungen des Dosierbandes 6 einerseits und des Kratzers 8 andererseits sind ebenfalls angedeutet. Insofern ist erkennbar, dass das Streugut über den Fallschacht 5 in den Bereich des Kratzers 8 eintritt und von dort zunächst in den hinteren Bereich des Bunkers 3 befördert wird. Von dort gelangt es über das Dosierband 6 in den Bereich der Austragswalzenfront 7, welche das Streugut aus dem Bunker 3 auf den unterhalb des Bunkers 3 angeordneten Streubandförderer 1 abwerfen. Dabei ist erkennbar, dass das Streugut aus dem Bunker nicht unmittelbar auf den Streubandförderer 1 auftrifft, sondern dass über die Austragswalzenfront 7 das Streugut zunächst einmal auf einen Streukopf 9 auftrifft, welcher im Ausführungsbeispiel als Streuwalzenstraße mit einer Vielzahl von Streuwalzen ausgebildet ist. Von dort gelangt das Streugut unter Bildung der Streugutmatte 2 auf den Streubandförderer 1. Üblicherweise sind dem Streukopf 9 verschiedene Mattenbehandlungseinrichtungen nachgeordnet, z. B. eine Egalisiereinheit und/oder eine Vorpresse, bevor die Streugutmatte in die Heißpresse eintritt.In the figures, a grit plant for scattering grit on a scatter belt conveyor 1 to form grit mats 2 for the production of wood-based panels is shown in fragmentary form. The spreading material may in particular be MDF fibers for the production of MDF boards. This grit plant has a grit hopper 3 for the scattered material to be sprinkled on the scatter belt conveyor 1. This grit hopper 3 has an upper-side filling opening 4, via which the (glued) grit is filled into the bunker 3. For this purpose, a chute 5 is connected to the top of the filling opening 4, via which the grit enters the grit hopper 3. The grit hopper 3 is formed as a horizontal bunker with a bottom-side dosing belt 6, which is also referred to as bunker bottom band. At the end, the dosing belt 6 is followed by a discharge device, which is designed as a discharge roller front 7 with a plurality of discharge rollers. In the upper part of the bunker 3, an upper conveyor is indicated, which acts as a scratch, z. B. chain scraper 8 is formed. The working directions of the dosing belt 6 on the one hand and the scraper 8 on the other hand are also indicated. In this respect it can be seen that the Spreading material on the chute 5 enters the area of the scraper 8 and is transported from there first to the rear of the bunker 3. From there it passes via the dosing belt 6 into the region of the discharge roller front 7, which discard the spreading material from the bunker 3 onto the scatter belt conveyor 1 arranged below the bunker 3. It can be seen that the grit from the bunker does not impinge directly on the scatter belt conveyor 1, but that on the Austragswalzenfront 7 the grit first hits once on a scattering head 9, which is formed in the embodiment as Streuwalzenstraße with a plurality of scattering rollers. From there, the grit passes to form the grit mat 2 on the scatter belt conveyor 1. Typically, the scattering head 9 different mat treatment facilities are arranged downstream, z. As a Egalisiereinheit and / or a pre-press before the grit mat enters the hot press.

Im Übrigen ist in Fig. 1 lediglich angedeutet, dass das Streugut in den Fallschacht über eine Streugutzuführeinrichtung 10 eintritt. Diese kann einen oder mehrere Zyklone mit endseitigen Zellradschleusen und/oder andere Förderer, Schnecken oder dergleichen aufweisen. Einzelheiten sind in den Figuren nicht dargestellt.Incidentally, in Fig. 1 merely indicated that the grit enters the chute via a grit feeding device 10. This can have one or more cyclones with end-side rotary valves and / or other conveyors, screws or the like. Details are not shown in the figures.

Erfindungsgemäß ist innerhalb des Fallschachtes 5 und folglich im Faserstrom eine Bremswalzeneinrichtung 11 angeordnet, welche zwei rotierend angetriebene Bremswalzen 12 aufweist. Gemäß Fig. 2 sind die Bremswalzen 12 um ein vorgegebenes Maß M beabstandet zueinander mit parallel zueinander angeordneten Achsen a angeordnet. Abstand M der Bremswalzen 12 meint hier den in Fig. 2 angedeuteten Abstand M der "Umfänge" der Bremswalzen. In Fig. 2 ist dabei angedeutet, dass die Bremswalzen 12 gegenläufig rotieren. Insoweit handelt es sich lediglich jedoch um ein Beispiel.According to the invention, a brake roller device 11, which has two rotationally driven brake rollers 12, is arranged within the chute 5 and consequently in the fiber flow. According to Fig. 2 the brake rollers 12 spaced by a predetermined amount M to each other with mutually parallel axes a arranged. Distance M of the brake rollers 12 means here in Fig. 2 indicated distance M of the "perimeters" of the brake rollers. In Fig. 2 is indicated that the brake rollers 12 rotate in opposite directions. In that regard, it is merely an example.

Insbesondere in Fig. 4, 5 und 6 ist erkennbar, dass die Bremswalzen 12 als Stachelwalzen mit jeweils einer Vielzahl von Stacheln 13 ausgebildet sind, welche sich im Wesentlichen in radialer Richtung erstrecken. Dazu weist jede Stachelwalze 12 mehrere an der Welle 14 befestigte Stachelkämme 15 auf, die sich über die gesamte Breite der Stachelwalze 12 erstrecken. Fig. 6 zeigt dabei, dass diese einzelnen Stachelkämme 15 jeweils paarweise unter einem vorgegebenen Winkel α zueinander angeordnet sind. Im Ausführungsbeispiel sind dabei sechs Stachelkämme 15 vorgesehen, welche jeweils paarweise mit identischem Winkel zueinander angeordnet sind. Wobei der Winkel im Ausführungsbeispiel α = 60° beträgt.In particular in Fig. 4 . 5 and 6 it can be seen that the brake rollers 12 are formed as spiked rollers, each having a plurality of spikes 13, which extend substantially in the radial direction. For this purpose, each spiked roller 12 has a plurality of spiked combs 15 fastened to the shaft 14 and extending over the entire width of the spiked roller 12. Fig. 6 shows, that these individual spiked combs 15 are each arranged in pairs at a predetermined angle α to each other. In the embodiment, six spiked combs 15 are provided, which are each arranged in pairs at an identical angle to each other. The angle in the embodiment is α = 60 °.

Dabei ist jeder dieser Stachelkämme 15 als einstückig gefertigtes Stachelblech ausgebildet. Die einzelnen Stachelbleche 15 sind mit der Welle 14 verschraubt und folglich lösbar mit der Welle verbunden.Each of these spiked combs 15 is formed as a one-piece manufactured spiked plate. The individual spiked plates 15 are screwed to the shaft 14 and thus releasably connected to the shaft.

Eine vergleichende Betrachtung der Fig. 5 und 6 zeigt darüber hinaus, dass jeweils zwei benachbarte Stachelkämme 15 versetzt zueinander angeordnet sind. Versetzt meint dabei bezogen auf die einzelnen Stacheln in Längsrichtung der Welle versetzt. Der Versatz x zwischen zwei benachbarten Stachelblechen beträgt dabei im Ausführungsbeispiel in etwa die Hälfte des Abstandes y zweier benachbarter Stacheln 13 eines Stachelbleches 15, so dass sich die in Fig. 5 angedeutete Anordnung "auf Lücke" ergibt.A comparative analysis of the Fig. 5 and 6 shows, moreover, that each two adjacent spiked combs 15 are offset from one another. Staggered means offset relative to the individual spines in the longitudinal direction of the shaft. The offset x between two adjacent spiked plates in the exemplary embodiment is approximately half the distance y of two adjacent spines 13 of a spiked plate 15, so that the in Fig. 5 indicated arrangement "gap" results.

In den Fig. 3 und 4 ist erkennbar, dass jeder Stachelwalze 12 ein eigener Antrieb 16 zugeordnet ist, welcher als elektromotorischer Antrieb 16 ausgebildet sein kann.In the Fig. 3 and 4 It can be seen that each spiked roller 12 is associated with its own drive 16, which may be designed as an electric motor drive 16.

Schließlich ist insbesondere in den Fig. 1 bis 3 angedeutet, dass in dem Fallschacht 5 nicht nur die erfindungsgemäßen Stachelwalzen 12 angeordnet sind, sondern dass oberhalb der Stachelwalzen 12 in dem Fallschacht 5 eine an sich bekannte Pendelschurre 17 vorgesehen ist, welche als bewegliche Rinne oder bewegliches Rohrstück ausgebildet sein kann und durch eine pendelnde Bewegung für eine verteilte Beaufschlagung des Fallschachtes 5 mit Streugut sorgt. Das Zusammenwirken dieser Pendelschurre 17 mit den erfindungsgemäßen Bremswalzen 12 führt zu besonders guten Ergebnissen.Finally, especially in the Fig. 1 to 3 indicated that not only the spiked rollers 12 according to the invention are arranged in the chute 5, but that above the spiked rollers 12 in the chute 5 a known pendulum chute 17 is provided, which may be formed as a movable groove or movable piece of pipe and by a pendulum motion ensures a distributed loading of the chute 5 with grit. The interaction of this pendulum chute 17 with the brake rollers 12 according to the invention leads to particularly good results.

Die Breite der Stachelwalzen erstreckt sich in etwa über die gesamte Breite des Fallschachtes. Sie entspricht in etwa der Breite des Streugutbunkers.The width of the spiked rollers extends approximately over the entire width of the chute. It corresponds approximately to the width of the grit bunker.

Eine in den Figuren dargestellte Bremswalze 12 kann eine Breite b von beispielsweise 2,5 bis 3 m aufweisen, wobei der Radius r beispielsweise 50 bis 80 cm, z. B. 60 bis 70 cm beträgt. Jedes einzelne Stachelblech 15 weist z. B. 20 bis 40, z. B. 25 bis 35 Stacheln auf, die einen Abstand y von 5 bis 15 cm, z. B. 8 bis 10 cm aufweisen können.A brake roller 12 shown in the figures may have a width b of, for example, 2.5 to 3 m, wherein the radius r, for example, 50 to 80 cm, z. B. is 60 to 70 cm. Every single spiked plate 15 has z. B. 20 to 40, z. B. 25 to 35 spikes, a distance y of 5 to 15 cm, z. B. 8 to 10 cm may have.

Bevorzugte Rotationsrichtungen sind durch die Pfeilpaare in Fig. 2 dargestellt. Die Rotationsgeschwindigkeit einer oder beider Walzen kann 5 bis 100 Umdrehungen pro Minute, vorzugsweise 6 bis 60 Umdrehungen pro Minute, z. B. 30 Umdrehungen pro Minute betragen.Preferred directions of rotation are indicated by the arrow pairs in FIG Fig. 2 shown. The rotational speed of one or both rolls may be 5 to 100 revolutions per minute, preferably 6 to 60 revolutions per minute, e.g. B. 30 revolutions per minute.

Claims (11)

  1. A spreading material plant for purposes of spreading material in the form of fibres onto a spreading material belt conveyor (1) so as to form spreading material mats (2) for the manufacture of fibre boards, e.g. MDF boards,
    with at least one spreading material bunker (3) for the spreading material that is to be spread onto the spreading material belt conveyor (1), which bunker is designed as a horizontal bunker with at least one floor-mounted metering conveyor (6), and at least one end-mounted extraction device (7) assigned to the metering conveyor, for purposes of extracting the spreading material onto a spreading material belt conveyor (1) arranged underneath the bunker (3), wherein
    the spreading material bunker has at least one topmounted filling opening (4), to which a chute (5) is connected, via which the spreading material enters the spreading material bunker (3),
    characterised in that,
    at least one braking roller unit (11) is arranged within the chute (5), which has at least two rotationally driven braking rollers (12), wherein
    the braking rollers (12) are spaced apart by a dimension (M), and are arranged at approximately the same height with parallel axes (a).
  2. The spreading material plant in accordance with Claim 1,
    characterised in that,
    one or a plurality of braking rollers (12) are designed as spiked rollers with a multiplicity of radially directed spikes (13).
  3. The spreading material plant in accordance with one of the Claims 1 to 2,
    characterised in that,
    the spiked rollers (12) have a plurality of spiked combs (15) attached to a shaft (14) and extending over the width of the shaft, which combs are arranged at an angle α relative to one another.
  4. The spreading material plant in accordance with Claim 3,
    characterised in that,
    the spiked combs (15) are designed as spiked plates.
  5. The spreading material plant in accordance with Claim 3 or 4,
    characterised in that,
    one spiked roller, or each spiked roller, has two to ten spiked combs (15).
  6. The spreading material plant in accordance with one of the Claims 3 to 5,
    characterised in that,
    the adjacent spiked combs (15) of a spiked roller (12) are in each case arranged in pairs with an identical angle (α) relative to one another.
  7. The spreading material plant in accordance with one of the Claims 3 to 6,
    characterised in that,
    each pair of adjacent spiked combs (15) are arranged displaced relative to another by a dimension (x) in the shaft longitudinal direction.
  8. The spreading material plant in accordance with Claim 7,
    characterised in that,
    the displacement (x) between two adjacent spiked combs is half the distance (y) between two adjacent spikes (13) of a spiked comb (15).
  9. The spreading material plant in accordance with one of the Claims 3 to 8,
    characterised in that,
    the spiked combs (15) are attached to the shaft (14) such that they can be detached.
  10. The spreading material plant in accordance with one of the Claims 1 to 9,
    characterised in that,
    each braking roller (12) of a braking roller device (11) is provided with its own drive (16).
  11. The spreading material plant in accordance with one of the Claims 1 to 10,
    characterised in that,
    a spreading material distribution unit is arranged upstream of the braking roller unit in the chute or above the chute.
EP08707444.9A 2007-02-17 2008-01-31 Dispersion installation Active EP2125312B1 (en)

Applications Claiming Priority (2)

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DE102007007952A DE102007007952B4 (en) 2007-02-17 2007-02-17 The scattering material plant
PCT/EP2008/000755 WO2008098682A1 (en) 2007-02-17 2008-01-31 Dispersion installation

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EP2125312A1 EP2125312A1 (en) 2009-12-02
EP2125312B1 true EP2125312B1 (en) 2015-03-11

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CN (1) CN101631656B (en)
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CA2678058A1 (en) 2008-08-21
EP2125312A1 (en) 2009-12-02
DE102007007952A1 (en) 2008-08-28
CN101631656B (en) 2013-07-03
DE102007007952B4 (en) 2008-10-16
CA2678058C (en) 2016-08-23
CN101631656A (en) 2010-01-20
WO2008098682A1 (en) 2008-08-21
US8435022B2 (en) 2013-05-07
US20100092591A1 (en) 2010-04-15

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