EP1027837A2 - Device for producing an uniform layer from a continuous flow of a thick layer of material - Google Patents

Device for producing an uniform layer from a continuous flow of a thick layer of material Download PDF

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Publication number
EP1027837A2
EP1027837A2 EP00101913A EP00101913A EP1027837A2 EP 1027837 A2 EP1027837 A2 EP 1027837A2 EP 00101913 A EP00101913 A EP 00101913A EP 00101913 A EP00101913 A EP 00101913A EP 1027837 A2 EP1027837 A2 EP 1027837A2
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EP
European Patent Office
Prior art keywords
acceleration
band
arrangement according
cascade
belt
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.)
Granted
Application number
EP00101913A
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German (de)
French (fr)
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EP1027837A3 (en
EP1027837B1 (en
Inventor
Heiko Niehues
Torsten Koch
Renke Schlarmann
Harry Drewes
Hans Dierken
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Koerber Technologies GmbH
Original Assignee
Hauni Maschinenbau GmbH
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Publication date
Priority claimed from DE1999106125 external-priority patent/DE19906125A1/en
Priority claimed from DE1999118774 external-priority patent/DE19918774A1/en
Application filed by Hauni Maschinenbau GmbH filed Critical Hauni Maschinenbau GmbH
Publication of EP1027837A2 publication Critical patent/EP1027837A2/en
Publication of EP1027837A3 publication Critical patent/EP1027837A3/en
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    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24C—MACHINES FOR MAKING CIGARS OR CIGARETTES
    • A24C5/00—Making cigarettes; Making tipping materials for, or attaching filters or mouthpieces to, cigars or cigarettes
    • A24C5/39—Tobacco feeding devices
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
    • A24B1/00—Preparation of tobacco on the plantation
    • A24B1/04—Sifting, sorting, cleaning or removing impurities from tobacco
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
    • A24B3/00—Preparing tobacco in the factory
    • A24B3/18—Other treatment of leaves, e.g. puffing, crimpling, cleaning

Definitions

  • the invention relates to an arrangement for forming a monolayer passing through a foreign body detection and separation device from a continuous supplied thick-layer material flow of low density with one of the supplied Material flow accelerating and stretching conveyor belt.
  • Under one Monolayer in the sense of the invention is to be understood as a relatively thin-layer material fleece, ideally a material flow composed of predominantly individual, ie one-layer adjacent components of a conveyed good and possible foreign bodies, the undesired components of which are clearly recognizable and selectable.
  • Under a thick-film material flow is to be understood as a mass flow corresponding to the desired delivery quantity per unit of time, more compactly composed of components of the conveyed goods lying on top of one another, possibly including foreign bodies.
  • Under a Low density material flow with material properties of the material to be conveyed which are relevant for the conveyance, for example a food product, is to be understood as its specific light weight, that is to say product components which have a relatively high air resistance in relation to their weight.
  • Such product components are, for example, leaf-shaped, such as leaf tobacco or spinach; further fragments of leaves or leaf-shaped components, such as tobacco strips and lettuce leaves, and stems or stem-shaped components, such as tobacco ribs and green beans, and furthermore tufts or shrub-like products, such as fresh thyme.
  • Product of the type mentioned, in particular food products are subject to special quality requirements with regard to the purity requirement. This also applies in particular to tobacco which goes through a processing process up to the manufacture of rod-shaped end products in the form of cigarettes, filter cigarettes and the like.
  • tobacco contains foreign constituents of the most varied types. It is desirable to separate these foreign bodies as early as possible in order to rule out disruptions in the processing process and impairment of the quality of the end product.
  • Strips which may be very similar in shape and size to the foreign components, places special demands on conveyor technology with regard to the clear identification of such foreign bodies in the moving tobacco stream.
  • the invention is based, with an at least equally good task, if necessary better sorting result the funded per unit of time and on Increase the amount of foreign material monitored material.
  • the conveyor belt has a belt cascade consisting of at least two successive acceleration belts in the conveying direction.
  • the conveyor cascade is assigned a feed conveyor in the form of an oscillating conveyor trough feeding the material to be conveyed with a layer thickness of the order of approximately 7 cm.
  • the upstream acceleration belt - in relation to the conveying direction - with a speed approximating the floating speed of the conveyed material in the order of magnitude of approximately 2.
  • a shortening of the conveying path or a minimum number of conveying stages is also achieved in that the acceleration belt downstream of the first acceleration belt is assigned a synchronously moving upper belt, which together form a laterally closed conveying channel converging in the conveying direction, in addition the upstream acceleration belt and the downstream acceleration belt can be driven with such a speed ratio that a layer thickness of the material flow which forms on the upstream acceleration belt is reduced to an order of magnitude of approximately half on the downstream acceleration belt.
  • the feed conveyor and the belt cascade expediently form a substantially horizontally oriented transport route.
  • the effectiveness of the belt cascade is essentially determined by the conveying channel of the downstream conveying means which accelerates the conveyed material. Whose air flow or lateral air closure is achieved in a simple manner in that the conveying channel is limited by lateral angle plates, on the horizontal limbs of which the upper belt is guided along and the vertical limbs are provided with sealing lips contacting the accelerating belt.
  • the advantage achieved with the invention is that gradually by a more effective Acceleration of the material flow, its layer thickness gradually is reduced that a uniform layer without significant differences in layer thickness is achieved. This is a very good efficiency the foreign body detection and rejection device even at a high level Throughput rate of the material flow rate guaranteed.
  • a foreign matter separator 1 - based on the conveying direction (arrow 2) of a tobacco stream 3 - is arranged upstream of a conveyor belt track designed as a belt cascade 4, comprising two successive acceleration belts 6 and 7 in the conveying direction (arrow 2), of which the first acceleration belt 6 can be driven at a speed approximating to the floating speed of the tobacco of approximately 2.5 to 3.5 m / sec, depending on the type and nature of the conveyed material components (strips, ribs, leaf material).
  • the preferred transport speed is approx. 2.7 m / sec approximating an average hovering speed of approx. 3 m / sec.
  • the second acceleration belt 7 of the belt cascade 4 is assigned a synchronously moving upper belt 8, which together form a conveyor channel 13 converging in the conveying direction (arrow 2) or narrowing to form a mouthpiece 12 formed by two deflecting rollers 9 and 11.
  • the conveyor channel 13 is closed laterally according to Figure 2 by two angle plates 14 and 16, the lower strand of the upper belt 8 delimiting the conveyor channel 13 being guided along the horizontal legs of the angle plates 14, 16 and the vertical legs of the angle plates 14, 16 each with one the upper run of the acceleration belt 7 bounding the conveying channel 13 are provided with sealing lips 17, the contacting outside of which has a felt pad.
  • the conveyor cascade 4 is assigned upstream of a feed conveyor 18, in the present exemplary embodiment in the form of a vibrating conveyor trough 19, with the conveyor cascade 4 and the oscillating conveyor trough 19 extending horizontally.
  • the foreign body separator 1 consists of laser detectors 21 known per se for scanning the tobacco flow 3, a reference drum 22 coordinated in color with the tobacco, an image processing processor (not shown) for known foreign bodies 23 integrated in the foreign body separator 1 for detecting and determining the position of foreign bodies 23 and blow-out nozzles 24 for selecting the foreign bodies 23.
  • a funding means for receiving and removing the tobacco stream 3 freed from foreign bodies is designated by 26, and a funding means for collecting and removing the rejected foreign bodies 23 is designated by 27.
  • the mode of operation of the arrangement is explained on the basis of a belt cascade designed for a throughput of about ten tons of tobacco per hour, with all conveying elements extending perpendicularly to the drawing plane over a width of approximately 1.6 m.
  • a continuous stream of tobacco is supplied with a layer thickness of approximately 7 cm on the vibrating conveyor trough 19 at approximately 0.4 m / sec and transferred to the first acceleration belt 6. Its speed of approx. 2.7 m / sec reduces the layer thickness of the tobacco flow to approx. 2 cm.
  • this layer thickness is halved again.
  • the reduced in this way to a relatively thin tobacco layer and evenly Spread tobacco monolayer happens after dropping off the acceleration belt 7 the laser detectors 21, which are perpendicular to the full width
  • the plane of the drawing reacts to foreign objects 23 flying by and corresponding ones Emit signals.
  • the image processing processor Detected by signaling very specific detectors 21 the image processing processor also the respective position of the foreign bodies 23 within of the tobacco stream 3 and controls the corresponding blow-out nozzles 24 targeted separation of the recognized foreign bodies 23.
  • the particular at relatively small foreign objects 23 are blown tobacco leaves at the same time then sorted out and returned to the processing process.
  • the Band cascade 4 if necessary, by an additional, the acceleration band 7 corresponding belt section can be added.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Agronomy & Crop Science (AREA)
  • Manufacturing Of Cigar And Cigarette Tobacco (AREA)
  • Structure Of Belt Conveyors (AREA)
  • Sorting Of Articles (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Formation And Processing Of Food Products (AREA)
  • Relays Between Conveyors (AREA)
  • Attitude Control For Articles On Conveyors (AREA)

Abstract

The arrangement has a conveyor belt system that accelerates and extends the delivered material flow with a conveyor belt cascade with at least two consecutive acceleration belts (6,7) in the delivery direction (2). The conveyor belt cascade is associated with a supplying device in the form of a vibrating conveyor channel (19) delivering a flow of material of thickness of the order of 7 cm.

Description

Die Erfindung betrifft eine Anordnung zum Bilden einer eine Fremdkörpererkennungs- und Abscheideeinrichtung passierenden Monolage aus einem kontinuierlich zugeführten dickschichtigen Materialstrom geringer Dichte mit einer den zugeführten Materialstrom beschleunigenden und streckenden Transportbänderbahn.The invention relates to an arrangement for forming a monolayer passing through a foreign body detection and separation device from a continuous supplied thick-layer material flow of low density with one of the supplied Material flow accelerating and stretching conveyor belt.

Unter einer

Figure 00010001
Monolage" ist im erfindungsgemäßen Sinn ein relativ dünnschichtiges Materialvlies, im Idealfall ein aus überwiegend vereinzelten, d. h. einschichtig nebeneinanderliegenden Bestandteilen eines Fördergutes und eventuellen Fremdkörpern zusammengesetzter Materialstrom zu verstehen, dessen unerwünschte Bestandteile eindeutig erkennbar und selektierbar sind.
Unter einem dickschichtigen Materialstrom" ist ein der gewünschten Fördermenge pro Zeiteinheit entsprechend kompakter, aus vielfach aufeinanderliegenden Bestandteilen des Fördergutes unter evtl Einschluß von Fremdkörpern zusammengesetzter Massengutstrom zu verstehen.
Unter einem Materialstrom geringer Dichte" mit für die Förderung relevanten Materialeigenschaften des Fördergutes, zum Beispiel eines Lebensmittelproduktes, ist dessen spezifisches Leichtgewicht zu verstehen, also Produktbestandteile, die einen - bezogen auf ihr Gewicht - relativ hohen Luftwiderstand aufweisen.Under one
Figure 00010001
Monolayer "in the sense of the invention is to be understood as a relatively thin-layer material fleece, ideally a material flow composed of predominantly individual, ie one-layer adjacent components of a conveyed good and possible foreign bodies, the undesired components of which are clearly recognizable and selectable.
Under a thick-film material flow "is to be understood as a mass flow corresponding to the desired delivery quantity per unit of time, more compactly composed of components of the conveyed goods lying on top of one another, possibly including foreign bodies.
Under a Low density material flow "with material properties of the material to be conveyed which are relevant for the conveyance, for example a food product, is to be understood as its specific light weight, that is to say product components which have a relatively high air resistance in relation to their weight.

Derartige Produktbestandteile sind zum Beispiel blattförmig, wie Blattabak oder Spinat; des weiteren Bruchstücke von Blättern oder blattartig geformte Bestandteile, wie Tabak-Strips und Salatblätter, sowie Stengel oder stengelförmig geformte Bestandteile, wie Tabakrippen und grüne Bohnen, und darüber hinaus Büschel bzw. strauchartige Produkte, wie frischer Thymian.
An Produkte der genannten Art, insbesondere Lebensmittelprodukte, werden hinsichtlich des Reinheitsgebotes besondere Qualitätsanforderungen gestellt. Dies gilt insbesondere auch für Tabak, der einen Verarbeitungsprozeß bis zur Konfektionierung stabförmiger Endprodukte in Form von Zigaretten, Filterzigaretten und dergleichen durchläuft. Tabak enthält erfahrungsgemäß Fremdbestandteile der unterschiedlichsten Art. Es ist wünschenswert, diese Fremdkörper möglichst frühzeitig auszusondern, um Störungen im Verarbeitungsprozeß sowie Qualitätsbeeinträchtigungen des Endproduktes auszuschließen.
Insbesondere Blattabak bzw. entrippter Blattabak in Form von sogenannten Strips", die in Form und Größe unter Umständen den Fremdbestandteilen sehr ähneln, stellt besondere Anforderungen fördertechnischer Art im Hinblick auf eine eindeutige Identifizierung derartiger Fremdkörper im bewegten Tabakstrom.Such product components are, for example, leaf-shaped, such as leaf tobacco or spinach; further fragments of leaves or leaf-shaped components, such as tobacco strips and lettuce leaves, and stems or stem-shaped components, such as tobacco ribs and green beans, and furthermore tufts or shrub-like products, such as fresh thyme.
Products of the type mentioned, in particular food products, are subject to special quality requirements with regard to the purity requirement. This also applies in particular to tobacco which goes through a processing process up to the manufacture of rod-shaped end products in the form of cigarettes, filter cigarettes and the like. Experience has shown that tobacco contains foreign constituents of the most varied types. It is desirable to separate these foreign bodies as early as possible in order to rule out disruptions in the processing process and impairment of the quality of the end product.
In particular leaf tobacco or stripped leaf tobacco in the form of so-called Strips ", which may be very similar in shape and size to the foreign components, places special demands on conveyor technology with regard to the clear identification of such foreign bodies in the moving tobacco stream.

Eine Einrichtung der eingangs bezeichneten Art ist durch das US-Patent 5 558 199 bekanntgeworden.A device of the type described in the opening paragraph is disclosed in US Pat. No. 5,558,199 known.

Der Erfindung liegt die Aufgabe zugrunde, bei einem zumindest gleichguten, gegebenenfalls besseren Aussonderungsergebnis die pro Zeiteinheit geförderte und auf Fremdbestandteile überwachte Materialmenge zu erhöhen. The invention is based, with an at least equally good task, if necessary better sorting result the funded per unit of time and on Increase the amount of foreign material monitored material.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Transportbänderbahn eine aus wenigstens zwei in Förderrichtung aufeinanderfolgenden Beschleunigungsbändern bestehende Bänderkaskade aufweist.
Um die Bänderkaskade kontinuierlich mit dem Fördergut im aufgelockerten Zustand und in der gewünschten Menge zu versorgen, wird weiterhin vorgeschlagen, daß der Bänderkaskade ein Beschickungsfördermittel in Form einer das Fördergut mit einer Schichtdicke in einer Größenordnung von ca. 7 cm zuführenden Schwingförderrinne zugeordnet ist.
Um bei einer vorgegebenen Materialdurchsatzmenge eine möglichst kurze Durchlaufstrecke so effektiv wie möglich zu betreiben, wird weiterhin vorgeschlagen, daß bei zwei aufeinanderfolgenden Beschleunigungsbändern das - bezogen auf die Förderrichtung - stromaufwärtige Beschleunigungsband mit einer der Schwebegeschwindigkeit des Fördergutes nahekommenden Geschwindigkeit in einer Größenordnung von ca. 2,5 bis 3,5 m/sec antreibbar ist.
Eine Verkürzung der Förderstrecke bzw. eine Mindestanzahl von Förderstufen wird außerdem dadurch erreicht, daß dem dem ersten Beschleunigungsband stromab nachgeordneten Beschleunigungsband ein synchron mitlaufendes Oberband zugeordnet ist, die gemeinsam einen in Förderrichtung konvergierenden, seitlich geschlossenen Förderkanal bilden, wobei darüber hinaus das stromaufwärtige Beschleunigungsband und das stromabwärtige Beschleunigungsband mit einem derartigen Geschwindigkeitsverhältnis antreibbar sind, daß eine sich auf dem stromaufwärtigen Beschleunigungsband ausbildende Schichtdicke des Materialstromes auf dem stromabwärtigen Beschleunigungsband auf eine Größenordnung von ca. Hälfte reduziert wird. Infolge der auf diese Weise zwischen Ober- und Unterbändern mitbewegten Umgebungsluft können alle genannten Produkte und sonstigen Produkte, die ein großes Volumen bei geringem Gewicht einnehmen, schnell transportiert werden.
Zweckmäßigerweise bilden die Beschickungsfördermittel und die Bänderkaskade eine im wesentlichen horizontal ausgerichtete Transportstrecke.
Die Effektivität der Bänderkaskade wird wesentlich durch den das Fördergut beschleunigenden Förderkanal der stromabwärtigen Fördermittel bestimmt. Dessen Luftführung bzw. seitlicher Luftabschluß wird auf einfache Weise dadurch erreicht, daß der Förderkanal durch seitliche Winkelbleche begrenzt ist, auf deren horizontalen Schenkeln das Oberband schleifend entlanggeführt ist und deren senkrechte Schenkel mit das Beschleunigungsband kontaktierenden Dichtlippen versehen sind.This object is achieved in that the conveyor belt has a belt cascade consisting of at least two successive acceleration belts in the conveying direction.
In order to continuously supply the conveyor cascade with the material to be conveyed in the loosened state and in the desired quantity, it is further proposed that the conveyor cascade is assigned a feed conveyor in the form of an oscillating conveyor trough feeding the material to be conveyed with a layer thickness of the order of approximately 7 cm.
In order to operate as short a passage as possible with a given material throughput quantity as effectively as possible, it is further proposed that, in the case of two successive acceleration belts, the upstream acceleration belt - in relation to the conveying direction - with a speed approximating the floating speed of the conveyed material in the order of magnitude of approximately 2. 5 to 3.5 m / sec can be driven.
A shortening of the conveying path or a minimum number of conveying stages is also achieved in that the acceleration belt downstream of the first acceleration belt is assigned a synchronously moving upper belt, which together form a laterally closed conveying channel converging in the conveying direction, in addition the upstream acceleration belt and the downstream acceleration belt can be driven with such a speed ratio that a layer thickness of the material flow which forms on the upstream acceleration belt is reduced to an order of magnitude of approximately half on the downstream acceleration belt. As a result of the ambient air moving in this way between the upper and lower belts, all of the products mentioned and other products which take up a large volume and are light in weight can be transported quickly.
The feed conveyor and the belt cascade expediently form a substantially horizontally oriented transport route.
The effectiveness of the belt cascade is essentially determined by the conveying channel of the downstream conveying means which accelerates the conveyed material. Whose air flow or lateral air closure is achieved in a simple manner in that the conveying channel is limited by lateral angle plates, on the horizontal limbs of which the upper belt is guided along and the vertical limbs are provided with sealing lips contacting the accelerating belt.

Der mit der Erfindung erzielte Vorteil besteht darin, daß durch eine effektivere stufenweise Beschleunigung des Materialstromes dessen Schichtdicke derart schrittweise reduziert wird, daß eine gleichmäßige Schicht ohne wesentliche Schichtdickenunterschiede erzielt wird. Auf diese Weise ist ein sehr guter Wirkungsgrad der Fremdkörpererkennungs- und Aussonderungseinrichtung auch bei einer hohen Durchsatzrate des Materialmengenstromes gewährleistet. The advantage achieved with the invention is that gradually by a more effective Acceleration of the material flow, its layer thickness gradually is reduced that a uniform layer without significant differences in layer thickness is achieved. This is a very good efficiency the foreign body detection and rejection device even at a high level Throughput rate of the material flow rate guaranteed.

Die Erfindung wird nachstehend anhand eines in der Zeichnung dargestellten Ausführungsbeispiels näher erläutert.The invention is described below with reference to an embodiment shown in the drawing explained in more detail.

Hierbei zeigen:

Figur 1
eine Fördereinrichtung zur Entfernung von Fremdkörpern aus einem Tabakstrom in der Seitenansicht und
Figur 2
einen Querschnitt durch eine Beschleunigungsbänderstrecke entlang der Schnittlinie A-A gemäß Figur 1.
Here show:
Figure 1
a conveyor for removing foreign bodies from a tobacco stream in the side view and
Figure 2
3 shows a cross section through an acceleration belt section along the section line AA according to FIG. 1.

Gemäß Figur 1 ist einem Fremdkörperabscheider 1 - bezogen auf die Förderrichtung (Pfeil 2) eines Tabakstromes 3 - stromauf eine als Bänderkaskade 4 ausgebildete Transportbänderbahn vorgeordnet, bestehend aus zwei in Förderrichtung (Pfeil 2) aufeinanderfolgenden Beschleunigungsbändern 6 und 7, von denen das erste Beschleunigungsband 6 mit einer der Schwebegeschwindigkeit des Tabaks nahekommenden Geschwindigkeit von ungefähr 2,5 bis 3,5 m/sec je nach Art und Beschaffenheit der Fördergutbestandteile (Strips, Rippen, Blattgut) antreibbar ist.
Die bevorzugte Transportgeschwindigkeit beträgt ca. 2,7 m/sec in Annäherung an eine mittlere Schwebegeschwindigkeit von ca. 3 m/sec.
Dem zweiten Beschleunigungsband 7 der Bänderkaskade 4 ist ein synchron mitlaufendes Oberband 8 zugeordnet, die gemeinsam einen in Förderrichtung (Pfeil 2) konvergierenden bzw. sich zu einem durch zwei Umlenkwalzen 9 und 11 gebildeten Mundstück 12 verengenden Förderkanal 13 bilden.
Der Förderkanal 13 ist gemäß Figur 2 durch zwei Winkelbleche 14 und 16 seitlich geschlossen, wobei das den Förderkanal 13 begrenzende Untertrum des Oberbandes 8 auf den horizontalen Schenkeln der Winkelbleche 14, 16 schleifend entlanggeführt ist und die senkrechten Schenkel der Winkelbleche 14, 16 jeweils mit einer das den Förderkanal 13 begrenzende Obertrum des Beschleunigungsbandes 7 kontaktierenden Dichtlippen 17 versehen sind, deren kontaktierende Außenseite eine Filzauflage aufweist.
Der Bänderkaskade 4 ist - bezogen auf die Förderrichtung (Pfeil 2) - stromauf ein Beschickungsfördermittel 18, im vorliegenden Ausführungsbeispiel in Form einer Schwingförderrinne 19 zugeordnet, wobei die Bänderkaskade 4 und die Schwingförderrinne 19 horizontal verlaufen.
Der Fremdkörperabscheider 1 besteht aus an sich bekannten Laser-Detektoren 21 zum Abtasten des Tabakstromes 3, einer farblich auf den Tabak abgestimmten Referenztrommel 22, einem auf bekannte, in den Fremdkörperabscheider 1 integrierten, nicht dargestellten Bildverarbeitungsprozessor zur Erkennung und Lagebestimmung von Fremdkörpern 23 sowie Ausblasdüsen 24 zum Selektieren der Fremdkörper 23. Mit 26 ist ein Fördermittel zur Aufnahme und Abförderung des von Fremdkörpern befreiten Tabakstromes 3 und mit 27 ein Fördermittel zum Auffangen und Abfördern der aussortierten Fremdkörper 23 bezeichnet.According to FIG. 1, a foreign matter separator 1 - based on the conveying direction (arrow 2) of a tobacco stream 3 - is arranged upstream of a conveyor belt track designed as a belt cascade 4, comprising two successive acceleration belts 6 and 7 in the conveying direction (arrow 2), of which the first acceleration belt 6 can be driven at a speed approximating to the floating speed of the tobacco of approximately 2.5 to 3.5 m / sec, depending on the type and nature of the conveyed material components (strips, ribs, leaf material).
The preferred transport speed is approx. 2.7 m / sec approximating an average hovering speed of approx. 3 m / sec.
The second acceleration belt 7 of the belt cascade 4 is assigned a synchronously moving upper belt 8, which together form a conveyor channel 13 converging in the conveying direction (arrow 2) or narrowing to form a mouthpiece 12 formed by two deflecting rollers 9 and 11.
The conveyor channel 13 is closed laterally according to Figure 2 by two angle plates 14 and 16, the lower strand of the upper belt 8 delimiting the conveyor channel 13 being guided along the horizontal legs of the angle plates 14, 16 and the vertical legs of the angle plates 14, 16 each with one the upper run of the acceleration belt 7 bounding the conveying channel 13 are provided with sealing lips 17, the contacting outside of which has a felt pad.
The conveyor cascade 4 is assigned upstream of a feed conveyor 18, in the present exemplary embodiment in the form of a vibrating conveyor trough 19, with the conveyor cascade 4 and the oscillating conveyor trough 19 extending horizontally.
The foreign body separator 1 consists of laser detectors 21 known per se for scanning the tobacco flow 3, a reference drum 22 coordinated in color with the tobacco, an image processing processor (not shown) for known foreign bodies 23 integrated in the foreign body separator 1 for detecting and determining the position of foreign bodies 23 and blow-out nozzles 24 for selecting the foreign bodies 23. A funding means for receiving and removing the tobacco stream 3 freed from foreign bodies is designated by 26, and a funding means for collecting and removing the rejected foreign bodies 23 is designated by 27.

Die Wirkungsweise der Anordnung wird anhand einer für eine Durchsatzleistung von etwa zehn Tonnen Tabak pro Stunde ausgelegte Bänderkaskade erläutert, wobei sich alle Förderorgane senkrecht zur Zeichenebene über eine Breite von ca. 1,6 m erstrecken.
Ein kontinuierlicher Tabakstrom wird mit einer Schichtdicke von ca. 7 cm auf der Schwingförderrinne 19 mit ca. 0,4 m/sec zugeführt und auf das erste Beschleunigungsband 6 übergeben. Dessen Geschwindigkeit von ca. 2,7 m/sec reduziert dabei die Schichtdicke des Tabakstromes auf ca 2 cm. Beim Abwurf des Tabaks auf das nachfolgende, mit ca. 5,7 m/sec laufende Beschleunigungsband 7 wird diese Schichtdicke nochmals halbiert. Erreicht wird dies durch die beim Eintritt des Tabaks in den Förderkanal 13 mitgerissene Umgebungsluft, wodurch eine zusätzliche Ventilationswirkung entsteht, welche ein beschleunigtes Mitreißen und damit Strecken des Tabakstromes bei einer relativ hohen, über der Schwebegeschwindigkeit des Tabaks einstellbaren Bandgeschwindigkeit von ca. 5,7 m/sec bewirkt.The mode of operation of the arrangement is explained on the basis of a belt cascade designed for a throughput of about ten tons of tobacco per hour, with all conveying elements extending perpendicularly to the drawing plane over a width of approximately 1.6 m.
A continuous stream of tobacco is supplied with a layer thickness of approximately 7 cm on the vibrating conveyor trough 19 at approximately 0.4 m / sec and transferred to the first acceleration belt 6. Its speed of approx. 2.7 m / sec reduces the layer thickness of the tobacco flow to approx. 2 cm. When the tobacco is thrown onto the subsequent acceleration belt 7, which runs at approx. 5.7 m / sec, this layer thickness is halved again. This is achieved by the ambient air entrained when the tobacco enters the conveying channel 13, which creates an additional ventilation effect, which accelerates entrainment and thus stretches the tobacco flow at a relatively high belt speed of about 5.7 m, which can be set above the tobacco floating speed / sec.

Die auf diese Weise auf eine relativ dünne Tabakschicht reduzierte und gleichmäßig ausgebreitete Tabakmonolage passiert nach Abwurf vom Beschleunigungsband 7 die Laser-Detektoren 21, welche über die volle Breite senkrecht zur Zeichenebene auf vorbeifliegende Fremdkörper 23 reagieren und entsprechende Signale abgeben. Durch die Signalgabe ganz bestimmter Detektoren 21 erkennt der Bildverarbeitungsprozessor auch die jeweilige Lage der Fremdkörper 23 innerhalb des Tabakstromes 3 und steuert die entsprechenden Ausblasdüsen 24 zur gezielten Aussonderung der erkannten Fremdkörper 23 an. Die insbesondere bei relativ kleinen Fremdkörpern 23 gleichzeitig mit ausgeblasenen Tabakblätter werden danach wieder aussortiert und in den Verarbeitungsprozeß zurückgeführt.The reduced in this way to a relatively thin tobacco layer and evenly Spread tobacco monolayer happens after dropping off the acceleration belt 7 the laser detectors 21, which are perpendicular to the full width The plane of the drawing reacts to foreign objects 23 flying by and corresponding ones Emit signals. Detected by signaling very specific detectors 21 the image processing processor also the respective position of the foreign bodies 23 within of the tobacco stream 3 and controls the corresponding blow-out nozzles 24 targeted separation of the recognized foreign bodies 23. The particular at relatively small foreign objects 23 are blown tobacco leaves at the same time then sorted out and returned to the processing process.

Bei einer eventuell beabsichtigten weiteren Erhöhung der Förderleistung könnte die Bänderkaskade 4 gegebenenfalls um eine zusätzliche, dem Beschleunigungsband 7 entsprechende Bänderstrecke ergänzt werden.In the event of a further intended increase in the output, the Band cascade 4, if necessary, by an additional, the acceleration band 7 corresponding belt section can be added.

Claims (7)

Anordnung zum Bilden einer eine Fremdkörpererkennungs- und Abscheideeinrichtung passierenden Monolage aus einem kontinuierlich zugeführten dickschichtigen Materialstrom geringer Dichte, mit einer den zugeführten Materialstrom beschleunigenden und streckenden Transportbänderbahn, dadurch gekennzeichnet, daß die Transportbänderbahn eine aus wenigstens zwei in Förderrichtung (Pfeil 2) aufeinanderfolgenden Beschleunigungsbändern (6, 7) bestehende Bänderkaskade (4) aufweist.Arrangement for forming a foreign body detection and separation device passing monolayer from a continuously fed thick layer Material flow of low density, with a material flow supplied accelerating and stretching conveyor belt, characterized, that the conveyor belt is one of at least two in the conveying direction (arrow 2) successive acceleration bands (6, 7) existing band cascade (4). Anordnung nach Anspruch 1, dadurch gekennzeichnet, daß der Bänderkaskade (4) ein Beschickungsfördermittel (18) in Form einer das Fördergut mit einer Schichtdicke in einer Größenordnung von ca. 7 cm zuführenden Schwingförderrinne (19) zugeordnet ist.Arrangement according to claim 1, characterized in that the ribbon cascade (4) a feed conveyor (18) in the form of a material to be conveyed Layer thickness in the order of approximately 7 cm feeding vibratory conveyor trough (19) is assigned. Anordnung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß bei zwei aufeinanderfolgenden Beschleunigungsbändern (6, 7) das - bezogen auf die Förderrichtung - stromaufwärtige Beschleunigungsband (6) mit einer der Schwebegeschwindigkeit des Fördergutes nahekommenden Geschwindigkeit in einer Größenordnung von ca. 2,5 bis 3,5 m/sec antreibbar ist.Arrangement according to claim 1 or 2, characterized in that two successive acceleration belts (6, 7) - based on the conveying direction - Upstream acceleration band (6) with one of the levitation speed the speed of the material to be conveyed is of a magnitude 2.5 to 3.5 m / sec can be driven. Anordnung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß dem dem ersten Beschleunigungsband (6) stromab nachgeordneten Beschleunigungsband (7) ein synchron mitlaufendes Oberband (8) zugeordnet ist, die gemeinsam einen in Förderrichtung (Pfeil 2) konvergierenden, seitlich geschlossenen Förderkanal (13) bilden.Arrangement according to one of claims 1 to 3, characterized in that the acceleration band downstream of the first acceleration band (6) (7) a synchronously moving upper band (8) is assigned, which together a laterally closed conveying channel converging in the conveying direction (arrow 2) (13) form. Anordnung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das stromaufwärtige Beschleunigungsband (6) und das stromabwärtige Beschleunigungsband (7) mit einem derartigen Geschwindigkeitsverhältnis antreibbar sind, daß eine sich auf dem stromaufwärtigen Beschleunigungsband (6) ausbildende Schichtdicke des Materialstromes auf dem stromabwärtigen Beschleunigungsband (7) auf eine Größenordnung von ca. der Hälfte reduziert wird.Arrangement according to one of claims 1 to 4, characterized in that the upstream acceleration band (6) and the downstream acceleration band (7) can be driven at such a speed ratio, that forming on the upstream acceleration band (6) Layer thickness of the material flow on the downstream acceleration band (7) is reduced to an order of magnitude of approximately half. Anordnung nach Anspruch 2, dadurch gekennzeichnet, daß die Beschickungsfördermittel (18) und die Bänderkaskade (4) eine im wesentlichen horizontal ausgerichtete Transportstrecke bilden.Arrangement according to claim 2, characterized in that the feed conveyor (18) and the ribbon cascade (4) one essentially horizontal form aligned transport route. Anordnung nach Anspruch 4, dadurch gekennzeichnet, daß der Förderkanal (13) durch seitliche Winkelbleche (14, 16) begrenzt ist, auf deren horizontalen Schenkeln das Oberband (8) schleifend entlanggeführt ist und deren senkrechte Schenkel mit das Beschleunigungsband (7) kontaktierenden Dichtlippen (17) versehen sind.Arrangement according to claim 4, characterized in that the delivery channel (13) is limited by lateral angle plates (14, 16) on the horizontal Thighs the upper belt (8) is guided along and their vertical Leg with sealing lips (17) contacting the acceleration band (7) are provided.
EP00101913A 1999-02-13 2000-02-01 Device for producing an uniform layer from a continuous flow of a thick layer of material Expired - Lifetime EP1027837B1 (en)

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DE19906125 1999-02-13
DE1999106125 DE19906125A1 (en) 1999-02-13 1999-02-13 Arrangement for forming monolayer from continuously delivered thick film material flow has conveyor belt cascade with at least two consecutive acceleration belts in delivery direction
DE19918774 1999-04-24
DE1999118774 DE19918774A1 (en) 1999-04-24 1999-04-24 Arrangement for forming monolayer from continuously delivered thick film material flow has conveyor belt cascade with at least two consecutive acceleration belts in delivery direction

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PL192027B1 (en) 2006-08-31
EP1027837A3 (en) 2004-03-03
ES2264654T3 (en) 2007-01-16
EP1027837B1 (en) 2006-07-05
CN1149169C (en) 2004-05-12
CN1263856A (en) 2000-08-23
PL338329A1 (en) 2000-08-14
ATE332088T1 (en) 2006-07-15
US6332543B1 (en) 2001-12-25
DE50013100D1 (en) 2006-08-17
JP2000237693A (en) 2000-09-05

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