EP0511425B1 - Dispositif pour déposer en continu un matelas de fibres - Google Patents

Dispositif pour déposer en continu un matelas de fibres Download PDF

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Publication number
EP0511425B1
EP0511425B1 EP19910107012 EP91107012A EP0511425B1 EP 0511425 B1 EP0511425 B1 EP 0511425B1 EP 19910107012 EP19910107012 EP 19910107012 EP 91107012 A EP91107012 A EP 91107012A EP 0511425 B1 EP0511425 B1 EP 0511425B1
Authority
EP
European Patent Office
Prior art keywords
band
belt
intermediate band
moulding belt
scattering
Prior art date
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.)
Expired - Lifetime
Application number
EP19910107012
Other languages
German (de)
English (en)
Other versions
EP0511425A1 (fr
Inventor
Uwe Kunstmann
Walter Henschel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Carl Schenck AG
Original Assignee
Carl Schenck AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Carl Schenck AG filed Critical Carl Schenck AG
Priority to EP19910107012 priority Critical patent/EP0511425B1/fr
Priority to DE59106627T priority patent/DE59106627D1/de
Publication of EP0511425A1 publication Critical patent/EP0511425A1/fr
Application granted granted Critical
Publication of EP0511425B1 publication Critical patent/EP0511425B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/10—Moulding of mats
    • B27N3/14—Distributing or orienting the particles or fibres

Definitions

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

Landscapes

  • 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)

Claims (12)

  1. Dispositif pour déposer en continu une couche de fibres depuis une trémie de stockage sur une bande de moulage, le produit en fibres étant subdivisé, avant dépose sur la bande de moulage, en plusieurs fractions de tailles de particules différentes, caractérisé en ce que le produit en fibres, venant de la trémie de stockage (1) est d'abord déposé sur une bande intermédiaire (6), dont la vitesse de défilement est de plusieurs fois la vitesse de la bande de formage (7), puis est éjecté sur la bande de moulage (7).
  2. Dispositif selon la revendication 1, caractérisé en ce que la vitesse de défilement de la bande intermédiaire (6) est d'au moins cinq fois celle de la bande de moulage (7).
  3. Dispositif selon la revendication 2, caractérisé en ce que la vitesse de défilement de la bande intermédiaire (6) est de cinq à dix fois celle de la bande de moulage (7).
  4. Dispositif sel on l'une des revendications précédentes, caractérisé en ce que la vitesse de défilement de la bande intermédiaire (6) est choisie de façon à ce que les particules de produit en fibres soit individualisées sur la bande intermédiaire (6).
  5. Dispositif selon l'une des revendications précédentes, caractérisé en ce que, dans la zone d'éjection entre la bande de moulage (7) et la bande intermédiaire (6), est prévu un tamis circulant (8).
  6. Dispositif selon l'une des revendications précédentes, caractérisé en ce qu'au moins un dispositif de prélèvement de produit en fibres (11) déplaçable dans la zone d'éjection est prévu.
  7. Dispositif selon les revendications 5 et 6, caractérisé en ce que le dispositif de prélèvement (11) est disposé à proximité immédiate du tamis circulant (8).
  8. Dispositif selon les revendications 6 et 7, caractérisé en ce que sur la totalité de la largeur de dispersion, ou de la largeur de bande, sont disposés plusieurs dispositifs de prélèvement (11), déplaçables indépendamment les uns des autres et actionnés en fonction de la distribution de la masse, déterminée par un poste de mesure, du produit en fibres, sur la largeur de la bande de moulage.
  9. Dispositif selon l'une des revendications précédentes caractérisé en ce qu'une surface de fermeture réglable est disposée au-dessus de la partie intermédiaire (6).
  10. Dispositif selon la revendication 9, caractérisé en ce que la surface de fermeture est constituée par une bande circulante (13) pouvant être entraînée.
  11. Dispositif selon l'une des revendications précédentes caractérisé en ce que la bande intermédiaire (6) et/ou la bande circulante (13) est garnie de profils.
  12. Dispositif selon l'une des revendications précédentes caractérisé en ce qu'au moins un rouleau de dispersion (12) est disposé dans la zone d'éjection de la bande intermédiaire (6).
EP19910107012 1991-04-30 1991-04-30 Dispositif pour déposer en continu un matelas de fibres Expired - Lifetime EP0511425B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19910107012 EP0511425B1 (fr) 1991-04-30 1991-04-30 Dispositif pour déposer en continu un matelas de fibres
DE59106627T DE59106627D1 (de) 1991-04-30 1991-04-30 Vorrichtung zum kontinuierlichen Aufbringen einer Streugutschicht.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19910107012 EP0511425B1 (fr) 1991-04-30 1991-04-30 Dispositif pour déposer en continu un matelas de fibres

Publications (2)

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

Family

ID=8206683

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910107012 Expired - Lifetime EP0511425B1 (fr) 1991-04-30 1991-04-30 Dispositif pour déposer en continu un matelas de fibres

Country Status (2)

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

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29507686U1 (de) * 1995-05-10 1995-07-27 Texpan S.p.A., Muggio Vorrichtung zum Klassieren von streufähigem Material
CN1043019C (zh) * 1995-09-14 1999-04-21 南京林业大学 定向结构刨花板制作方法
WO1997036721A1 (fr) * 1996-03-28 1997-10-09 G. Siempelkamp Gmbh & Co. Dispositif pour repandre de façon ordonnee des copeaux de bois lors de la fabrication de panneaux d'agglomeres
DE19909607A1 (de) * 1999-03-05 2000-09-07 Dieffenbacher Schenck Panel Verfahren zur Herstellung von plattenförmigen Produkten
DE102008007950B3 (de) * 2008-02-07 2008-11-06 Kronotec Ag Vorrichtung zum Streuen von Streugut zu Streugutmatten

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1205274B (de) * 1961-03-01 1965-11-18 Schenck Gmbh Carl Vorrichtung zur Herstellung von Formkoerpern, insbesondere aus Holzspaenen
CH512991A (de) * 1970-12-09 1971-09-30 Uniboard Ag Spänesteumaschine

Also Published As

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

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