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EP1841908B1 - Method and device for removing foreign matters from a fibre material, in particular from raw cotton - Google Patents

Method and device for removing foreign matters from a fibre material, in particular from raw cotton Download PDF

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Publication number
EP1841908B1
EP1841908B1 EP05816080A EP05816080A EP1841908B1 EP 1841908 B1 EP1841908 B1 EP 1841908B1 EP 05816080 A EP05816080 A EP 05816080A EP 05816080 A EP05816080 A EP 05816080A EP 1841908 B1 EP1841908 B1 EP 1841908B1
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EP
European Patent Office
Prior art keywords
flow
conduit
discharge conduit
removal
foreign substances
Prior art date
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Expired - Lifetime
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EP05816080A
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German (de)
French (fr)
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EP1841908A1 (en
Inventor
Alexander Jürgens
Andreas Meyenhofer
Christian Anderegg
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Jossi Holding AG
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Jossi Holding AG
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Publication of EP1841908A1 publication Critical patent/EP1841908A1/en
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G31/00—Warning or safety devices, e.g. automatic fault detectors, stop motions
    • D01G31/003—Detection and removal of impurities

Definitions

  • the invention relates to a method for separating foreign substances into fibrous material, in particular raw cotton according to the preamble of claim 1.
  • Such methods are used, for example, in the blow room to prepare the raw cotton for the spinning process. In doing so, as soon as possible after opening the cotton bales, foreign fibers such as e.g. Lines, jute, etc., but also plastic films and the like excreted. While previously the contaminated subset was diverted via a flap or diverter into a separation vessel, the excretion today takes place exclusively via a transverse to the fiber transport line compressed air pulse.
  • a problem with the known methods is that a large amount of air is blown into the separation tank by the compressed air pulse at the moment of excretion during a short period of time. There is the risk that the foreign matter already lying in the separation container can be swirled up as a result of the resulting violent turbulence and thus be able to get back into the fiber transport line.
  • Various efforts have already been made to solve the problem of backflow or reliable separation of foreign matter.
  • the conveyor for the transport of the fiber material is at least partially formed by the endless surface of a continuous conveying means, for example by a screen drum on which the fiber material can be stored and carried.
  • a continuous conveying means for example by a screen drum on which the fiber material can be stored and carried.
  • the flow conditions in the fiber transport line should not be affected as much as possible and the disposal of foreign substances should be made possible without much effort.
  • the method should allow a relatively simple way to adapt to the given pneumatic transport conditions in a spinning mill. This object is achieved according to the invention with a method having the features in claim 1.
  • the excreted foreign matter does not necessarily have to be excreted in a largely pressure-tight separation vessel.
  • the precipitation according to the invention in a discharge connected to the separation opening, in which a permanent air flow is maintained combines two advantages with one another. On the one hand, the disposal of foreign matter takes place permanently and without intermediate storage in a separation vessel and on the other hand, no return flow is caused by the Ausscheideimpuls. If the flow conditions are correctly set, the direct connection of the fiber transport line to the discharge does not result in an impermissible pressure drop in the fiber transport line.
  • the air flow in the discharge line is adjusted such that, when the separation device is inactive, there is always a small partial flow from the discharge line into the fiber transport line. This prevents, for example, that off The fiber transport line permanently dust and fine single fibers get into the discharge.
  • the air flow can be maintained in the discharge by suction of atmospheric air, wherein at least a partial flow prevails, which extends away from the discharge opening in the direction of the flow of the Ausscheideimpulses.
  • This flow is achieved by an impurity only under the influence of the Ausscheideimpulses, whereby even after completion of the Ausscheideimpulses a backflow is no longer possible.
  • the prevailing in the derivative continuous flow can run relative to the flow of Ausscheideimpulses in different directions.
  • the elimination can be carried out based on the width of the fiber transport line or the separation opening by a compressed air pulse selectively only in that section in which the sensor system has detected a foreign substance. Even with simultaneous operation of multiple compressed air nozzles on different sections no turbulence, which cause a backflow of foreign substances.
  • the invention also relates to a device for separating foreign substances into fibrous material having the features of claim 6.
  • the foreign substances excreted by the device can thereby be disposed of, that the discharge is connected to a waste container or to a waste sack. This can be replaced from time to time.
  • the derivative could also be connected directly to a disposal device, which disposed of the foreign matter continuously.
  • the discharge is open to the atmosphere and that the foreign substances fall into an open container.
  • a fiber transport line 2 in which in loose form cotton fibers or cotton flakes be transported.
  • the device is integrated in a per se known manner in a cleaning line and arranged for example after a bale removing machine or after a first coarse cleaner.
  • the pneumatic transport are known in the art and not shown here.
  • the cotton fibers are passed from bottom to top with a tendency to vertical on the sensor system or on the separation device. However, this direction could be changed arbitrarily.
  • the fiber transport line (2) has a rectangular cross section, which is then converted again into a circular or any other cross section.
  • the sensor system consists in known manner of two cameras, such as CCD cameras 3, 3 ', whose optical axes are directed via deflecting mirrors 13, 13' from both sides to the fiber transport line.
  • the fiber transport line is transparent and there is illumination by means of luminaires 14 shown here only schematically.
  • the sensor system could also have sensors which have a foreign substance with other physical parameters can recognize, such as Ultrasonic sensors or sensors that respond to electromagnetic field changes.
  • a separating device designated overall by 4 is arranged on the fiber transport line 2. This has on one side a plurality of compressed air nozzles 5, which are selectively controllable, depending on in which section the sensor system has detected a foreign substance. Opposite the compressed air nozzles 5 is in the wall of the fiber transport line a separating opening 6 is arranged, through which a foreign substance can be excreted by means of a separating pulse b. This separation opening is connected via a connecting channel 10 with a transverse to the fiber transport line 2 extending discharge channel 7. Connecting channel and outlet channel form a total discharge for the excreted foreign matter.
  • the connecting channel 10 also has an approximately rectangular cross-section of the same width as the discharge opening 6.
  • the connecting channel leads tangentially into the discharge channel 7, which in particular FIG. 3 is apparent.
  • a curved baffle 15 causes a snail shell-like configuration in the area of the merge.
  • a suction slot 9 is also provided, the cross section of which can be changed by means of an adjustable flow aperture 19 and which extends over the entire channel width.
  • a sensor-controlled slide could also be provided which controls the inflow at the intake slot as a function of the pressure conditions.
  • the intake slot 9 causes a flow e against the discharge channel 7.
  • the intake slot could also be arranged relatively close to the discharge opening 6. It would also be conceivable to have an additional slot on the underside of the connection channel 10.
  • the approximately horizontally extending discharge channel 7 is connected at one end to the suction side of a fan 8 and from there to a waste bag 12. Alternatively, the discharge could also lead to a waste disposal facility.
  • the other end of the discharge channel 7 opens at the end face of the housing 17 in a suction port 11, the opening cross-section can be adjusted in a similar manner with a flow aperture.
  • viewing window 18 can be arranged be. The entire device rests on a rack 16 at a working height which facilitates installation and handling.
  • the flow conditions are adjusted by means of said flow orifices so that virtually equilibrium between the transport flow a in the fiber transport line 2 and the take-off flow d prevails in the discharge channel 7 in the region of entry of the connecting channel 10 in the discharge channel 7.
  • the flow is adjusted so that, starting from the intake slot 9, even a small return flow c in the direction of the discharge opening 6 prevails.
  • the compressed-air nozzle 5 is activated in the corresponding section, with an intensive excretion flow b being built up transversely to the transport flow a for a short time. This excretion flow tears a foreign substance 20 into the connection channel 10 (FIG. FIG.
  • the diameter of the discharge channel 7 could increase starting from the intake opening 11, so as to create equal pressure conditions over the entire width of the connecting channel or to compensate for a resulting pressure drop.
  • FIG. 4 runs the flow a in the pneumatic transport line 2 from top to bottom.
  • the connecting channel 10, starting from the separating opening 6, does not open into a transversely extending discharge channel, but slightly curved directly into the discharge channel 7, which then tapers in cross section again to a tube in which a delivery fan 8 is arranged.
  • Only a single suction opening in the form of a suction slot 9 is provided here. Its suction cross section could also be adjustable.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Preliminary Treatment Of Fibers (AREA)

Abstract

A sensor system (3, 3') for detecting foreign matters and a separation device (4) provided with at least one compressed air nozzle (5) which is perpendicular to a pneumatic fibre conveying conduit are successively mounted in a direction of conveyance (a), wherein said fibre conveying conduit is provided with a removing opening (6) arranged in front of the compressed air nozzle. Contrary to state of the art of actual methods and devices, the foreign matters are not removed to a substantially pressure-tight separation container. According to said invention, the removing opening (6) is connected to a derivation (7, 10) in which a permanent airflow (d, e) for transporting separated foreign matters away is maintained.

Description

Die Erfindung betrifft ein Verfahren zum Ausscheiden von Fremdstoffen in Fasermaterial, insbesondere in Rohbaumwolle gemäss dem Oberbegriff von Anspruch 1.The invention relates to a method for separating foreign substances into fibrous material, in particular raw cotton according to the preamble of claim 1.

Derartige Verfahren werden beispielsweise in der Putzerei eingesetzt, um die Rohbaumwolle für den Spinnprozess vorzubereiten. Dabei werden zu einem möglichst frühen Zeitpunkt nach dem Öffnen der Baumwollballen fremde Fasern wie z.B. Schnüre, Jutefetzen usw., aber auch Kunststofffolien und dergleichen ausgeschieden. Während früher die verunreinigte Teilmenge über eine Umlenkklappe oder Weiche in einen Ausscheidebehälter umgeleitet wurde, erfolgt die Ausscheidung heute ausschliesslich über einen quer zur Fasertransportleitung gerichteten Druckluftimpuls.Such methods are used, for example, in the blow room to prepare the raw cotton for the spinning process. In doing so, as soon as possible after opening the cotton bales, foreign fibers such as e.g. Lines, jute, etc., but also plastic films and the like excreted. While previously the contaminated subset was diverted via a flap or diverter into a separation vessel, the excretion today takes place exclusively via a transverse to the fiber transport line compressed air pulse.

Ein Problem bei den bekannten Verfahren besteht darin, dass durch den Druckluftimpuls im Augenblick der Ausscheidung während einer kurzen Zeitspanne eine grosse Luftmenge in den Ausscheidebehälter geblasen wird. Dabei besteht die Gefahr, dass die bereits im Ausscheidebehälter liegenden Fremdstoffe in Folge der dabei entstehenden heftigen Turbulenzen aufgewirbelt werden und so wieder in die Fasertransportleitung gelangen können. Es wurden bereits verschiedene Anstrengungen unternommen, um das Problem der Rückströmung bzw. der zuverlässigen Separierung der Fremdstoffe zu lösen.A problem with the known methods is that a large amount of air is blown into the separation tank by the compressed air pulse at the moment of excretion during a short period of time. There is the risk that the foreign matter already lying in the separation container can be swirled up as a result of the resulting violent turbulence and thus be able to get back into the fiber transport line. Various efforts have already been made to solve the problem of backflow or reliable separation of foreign matter.

Bereits in der WO 89/01832 wird auf das Problem der Turbulenzen im Ausscheidebehälter hingewiesen, welcher dort gegenüber der Atmosphäre weitgehend druckdicht ausgebildet ist. Zur Vermeidung von Aufwirbelungen wird vorgeschlagen, den Ausscheidebehälter derart gross auszubilden, dass sich die mit dem Gasdruckimpuls ausgelösten Strömungen und Turbulenzen zerstreuen können, ohne den Materialstrom zu beeinträchtigen. Das Fremdmaterial kann dann am Boden des Ausscheidebehälters über Schleusen entnommen werden. Damit kann das Problem aber nicht zufriedenstellend gelöst werden und bei den beschränkten Platzverhältnissen in einer Putzerei ist es nicht wünschenswert, ohne zwingende Notwendigkeit grossvolumige Komponenten einzubauen.Already in the WO 89/01832 is pointed to the problem of turbulence in the separation vessel, which is there formed largely pressure-tight with respect to the atmosphere. To avoid Aufwirbelungen is proposed to form the separation vessel so large that with the gas pressure pulse Dissipate triggered flows and turbulence without affecting the flow of material. The foreign material can then be removed at the bottom of the separation vessel via locks. Thus, the problem can not be solved satisfactorily and in the limited space in a blowroom, it is not desirable to install large components without compelling necessity.

In der DE-U 296 04 552 wird vorgeschlagen, den durch den Druckluftimpuls ausgelösten Luftstrom umzulenken und wieder der Fasertransportleitung zuzuführen. Zu diesem Zweck ist im Abstand zur Ausscheideöffnung eine weitere Öffnung angeordnet, welche den Ausscheidebehälter dauernd mit der Fasertransportleitung verbindet. Auch hier ist der Ausscheidebehälter luftdicht gegen die Atmosphäre abgedichtet und es ist im Detail nicht ersichtlich, wie die Fremdstoffe aus dem Ausscheidebehälter abgeführt werden können. Die Zurückführung der Strömung in die Fasertransportleitung bewirkt jedoch nicht ohne weiteres ein sicheres Abführen der Fremdstoffe. Insbesondere bei selektivem Ausblasen von Verunreinigungen nur über einen Teil der Kanalbreite wird die verdrängte Luft über den nächsten Weg, nämlich über die Ausscheideöffnung in den Transportkanal zurückströmen.In the DE-U 296 04 552 It is proposed to divert the air flow triggered by the compressed air pulse and to feed it back to the fiber transport line. For this purpose, a further opening is arranged at a distance from the separation opening, which connects the separation vessel permanently with the fiber transport line. Again, the separation vessel is sealed airtight to the atmosphere and it is not clear in detail how the foreign matter can be removed from the separation vessel. However, the return of the flow in the fiber transport line does not readily cause a safe removal of foreign substances. In particular, with selective blowing out of impurities only over part of the channel width, the displaced air will flow back through the next path, namely via the separation opening into the transport channel.

In der EP-A 989 214 wird zur Lösung des Problems vorgeschlagen, wenigstens während der Dauer des Ausscheideimpulses entweder das Volumen des Ausscheidebehälters zu vergrössern oder über eine Luftabzugsöffnung am Ausscheidebehälter Luft abzusaugen. Damit kann zwar ein Zurückströmen von Fremdstoffen in die Fasertransportleitung weitgehend verhindert werden, weil die im Ausscheidebehälter vorhandene Luft durch den Druckluftimpuls nicht verdrängt zu werden braucht. Durch die Sogwirkung im Augenblick der Ausscheidung erfolgt aber trotzdem eine störende Bewegung der im Ausscheidebehälter liegenden Fremdstoffe und diese müssen nach wie vor von Zeit zu Zeit über Schleusen dem Ausscheidebehälter entnommen werden.In the EP-A 989 214 is proposed to solve the problem, at least during the duration of the Ausscheideimpulses either to increase the volume of the separation vessel or to suck air through an air outlet opening on the separation vessel. Thus, although a backflow of foreign substances in the fiber transport line can be largely prevented because the existing air in the separation vessel need not be displaced by the compressed air pulse. Due to the suction effect at the moment of excretion, however, an interfering movement of the foreign matter in the separation container takes place and they have to follow suit as before taken from time to time via locks the separation vessel.

Ausserdem ist durch die EP-A 879 905 ein Verfahren und eine Vorrichtung bekannt geworden, bei denen das Fördermittel für den Transport des Fasermaterials wenigstens teilweise durch die endlose Oberfläche eines Stetigfördermittels, z.B. durch eine Siebtrommel gebildet wird, auf der das Fasermaterial ablegbar und mitführbar ist. Zwar lässt sich auf diese Weise die Vorschubbahn des Fasermaterials zwischen dem Sensorfeld und der Ausscheidevorrichtung gut kontrollieren, dafür muss aber die Transportluft bei einer pneumatischen Anlieferung weitgehend entfernt werden.In addition, by the EP-A 879 905 a method and a device has become known in which the conveyor for the transport of the fiber material is at least partially formed by the endless surface of a continuous conveying means, for example by a screen drum on which the fiber material can be stored and carried. Although the feed path of the fiber material between the sensor field and the separation device can be controlled well in this way, the transport air must be largely removed in the case of pneumatic delivery.

Es ist daher eine Aufgabe der Erfindung, ein Verfahren der eingangs genannten Art zu schaffen, bei dem die Fremdstoffe zuverlässig und dauernd aus der Fasertransportleitung ausgeschieden werden. Dabei sollen die Strömungsverhältnisse in der Fasertransportleitung möglichst nicht beeinträchtigt werden und die Entsorgung der Fremdstoffe soll ohne grossen Aufwand ermöglicht werden. Ausserdem soll das Verfahren auf relativ einfache Weise eine Anpassung an die gegebenen pneumatischen Transportverhältnisse in einer Spinnerei erlauben. Diese Aufgabe wird erfindungsgemäss mit einem Verfahren gelöst, das die Merkmale im Anspruch 1 aufweist.It is therefore an object of the invention to provide a method of the type mentioned, in which the foreign substances are reliably and permanently eliminated from the fiber transport line. The flow conditions in the fiber transport line should not be affected as much as possible and the disposal of foreign substances should be made possible without much effort. In addition, the method should allow a relatively simple way to adapt to the given pneumatic transport conditions in a spinning mill. This object is achieved according to the invention with a method having the features in claim 1.

Entgegen allen bisher vorgeschlagenen Lösungen hat es sich überraschend gezeigt, dass die ausgeschiedenen Fremdstoffe nicht zwingend in einen weitgehend druckdichten Ausscheidebehälter ausgeschieden werden müssen. Die erfindungsgemässe Ausscheidung in eine mit der Ausscheideöffnung verbundene Ableitung, in der eine permanente Luftströmung aufrecht erhalten wird, kombiniert zwei Vorteile miteinander. Einerseits erfolgt die Entsorgung der Fremdstoffe permanent und ohne Zwischenlagerung in einem Ausscheidebehälter und andererseits wird durch den Ausscheideimpuls keine Rückströmung ausgelöst. Bei richtiger Einstellung der Strömungsverhältnisse entsteht durch die direkte Verbindung der Fasertransportleitung mit der Ableitung kein unzulässiger Druckabfall in der Fasertransportleitung.Contrary to all previously proposed solutions, it has surprisingly been found that the excreted foreign matter does not necessarily have to be excreted in a largely pressure-tight separation vessel. The precipitation according to the invention in a discharge connected to the separation opening, in which a permanent air flow is maintained, combines two advantages with one another. On the one hand, the disposal of foreign matter takes place permanently and without intermediate storage in a separation vessel and on the other hand, no return flow is caused by the Ausscheideimpuls. If the flow conditions are correctly set, the direct connection of the fiber transport line to the discharge does not result in an impermissible pressure drop in the fiber transport line.

Vorzugsweise wird die Luftströmung in der Ableitung derart eingestellt, dass bei inaktiver Ausscheidevorrichtung ständig eine geringe Teilströmung von der Ableitung in die Fasertransportleitung herrscht. Damit wird beispielsweise verhindert, dass aus der Fasertransportleitung permanent Staub und feine Einzelfasern in die Ableitung gelangen.Preferably, the air flow in the discharge line is adjusted such that, when the separation device is inactive, there is always a small partial flow from the discharge line into the fiber transport line. This prevents, for example, that off The fiber transport line permanently dust and fine single fibers get into the discharge.

Die Luftströmung kann in der Ableitung durch Ansaugen von Atmosphärenluft aufrechterhalten werden, wobei wenigstens eine Teilströmung herrscht, die von der Ausscheideöffnung weg in Richtung der Strömung des Ausscheideimpulses verläuft. Diese Strömung wird von einem Fremdstoff nur unter der Einwirkung des Ausscheideimpulses erreicht, wobei auch nach Abschluss des Ausscheideimpulses eine Rückströmung nicht mehr möglich ist. Die in der Ableitung herrschende Dauerströmung kann dabei relativ zur Strömung des Ausscheideimpulses in verschiedenen Richtungen verlaufen.The air flow can be maintained in the discharge by suction of atmospheric air, wherein at least a partial flow prevails, which extends away from the discharge opening in the direction of the flow of the Ausscheideimpulses. This flow is achieved by an impurity only under the influence of the Ausscheideimpulses, whereby even after completion of the Ausscheideimpulses a backflow is no longer possible. The prevailing in the derivative continuous flow can run relative to the flow of Ausscheideimpulses in different directions.

Eine unbeabsichtigte Rückströmung von Fremdstoffen in die Fasertransportleitung kann weiter dadurch verhindert werden, dass die Strömung des Ausscheideimpulses mit Hilfe eines Leitelements etwa tangential einer Abzugsströmung zugeführt wird, die etwa quer zur Strömung des Ausscheideimpulses verläuft. Unter der Einwirkung dieses Leitelements nimmt ein Fremdstoff einen beispielsweise etwa schraubenlinienförmigen Verlauf, wobei eine Rückströmung zuverlässig verhindert wird.An unintentional backflow of foreign substances into the fiber transport line can be further prevented by the fact that the flow of Ausscheideimpulses is supplied by means of a guide element approximately tangentially to a take-off flow, which is approximately transverse to the flow of Ausscheideimpulses. Under the action of this guide element takes a foreign matter, for example, a helical course, with a return flow is reliably prevented.

Die Ausscheidung kann bezogen auf die Breite der Fasertransportleitung bzw. der Ausscheideöffnung durch einen Druckluftimpuls selektiv nur in demjenigen Abschnitt erfolgen, in dem das Sensorsystem einen Fremdstoff erkannt hat. Auch bei gleichzeitiger Betätigung mehrerer Druckluftdüsen auf verschiedenen Abschnitten entstehen keinerlei Turbulenzen, die ein Rückströmen der Fremdstoffe bewirken.The elimination can be carried out based on the width of the fiber transport line or the separation opening by a compressed air pulse selectively only in that section in which the sensor system has detected a foreign substance. Even with simultaneous operation of multiple compressed air nozzles on different sections no turbulence, which cause a backflow of foreign substances.

Die Erfindung betrifft auch eine Vorrichtung zum Ausscheiden von Fremdstoffen in Fasermaterial mit den Merkmalen von Anspruch 6. Die von der Vorrichtung ausgeschiedenen Fremdstoffe können dadurch entsorgt werden, dass die Ableitung an einen Abfallbehälter oder an einen Abfallsack angeschlossen ist. Dieser kann von Zeit zu Zeit ausgewechselt werden. Alternativ könnte die Ableitung aber auch direkt an eine Entsorgungsvorrichtung angeschlossen sein, welche die Fremdstoffe kontinuierlich entsorgt. Es wäre aber auch denkbar, dass die Ableitung gegenüber der Atmosphäre geöffnet ist und dass die Fremdstoffe in einen offenen Behälter fallen. Für Wartungsarbeiten an der Vorrichtung oder beispielsweise für das Auswechseln von Abfallbehältern könnte es vorteilhaft sein, einen Schieber einzubauen, mit welchem die Ableitung vorübergehend gegenüber der Ausscheideöffnung abtrennbar ist.The invention also relates to a device for separating foreign substances into fibrous material having the features of claim 6. The foreign substances excreted by the device can thereby be disposed of, that the discharge is connected to a waste container or to a waste sack. This can be replaced from time to time. Alternatively, however, the derivative could also be connected directly to a disposal device, which disposed of the foreign matter continuously. However, it would also be conceivable that the discharge is open to the atmosphere and that the foreign substances fall into an open container. For maintenance work on the device or for example for the replacement of waste containers, it may be advantageous to install a slide, with which the derivative is temporarily separated from the separation opening.

Weitere Vorteile und Einzelmerkmale der Erfindung ergeben sich aus der nachstehenden Beschreibung von Ausführungsbeispielen und aus den Zeichnungen. Es zeigen:

Figur 1:
eine stark vereinfachte perspektivische Darstel- lung einer Ausscheidevorrichtung,
Figur 2:
die Vorrichtung gemäss Figur 1 in einer perspek- tivischen Gesamtdarstellung,
Figur 3:
ein Querschnitt durch die Ableitung in den Figu- ren 1 und 2, und
Figur 4:
eine schematische Darstellung eines weiteren Ausführungsbeispiels der Erfindung.
Further advantages and individual features of the invention will become apparent from the following description of exemplary embodiments and from the drawings. Show it:
FIG. 1:
a greatly simplified perspective view of a separation device,
FIG. 2:
the device according to FIG. 1 in a perspective overall presentation,
FIG. 3:
a cross section through the derivative in the Fig. 1 and 2 , and
FIG. 4:
a schematic representation of another embodiment of the invention.

Wie aus den Figuren 1 und 2 ersichtlich ist, verfügt eine insgesamt mit 1 bezeichnete Vorrichtung über eine Fasertransportleitung 2, in welcher in loser Form Baumwollfasern bzw. Baumwollflocken transportiert werden. Die Vorrichtung ist auf an sich bekannte Weise in einer Putzereilinie integriert und beispielsweise nach einer Ballenabtragmaschine bzw. nach einem ersten Grobreiniger angeordnet. Die pneumatischen Transportmittel sind dem Fachmann bekannt und hier nicht näher dargestellt. Beim vorliegenden Ausführungsbeispiel werden die Baumwollfasern von unten nach oben mit einer Neigung zur vertikalen am Sensorsystem bzw. an der Ausscheidevorrichtung vorbeigeführt. Diese Richtung könnte jedoch beliebig geändert werden. Im Bereich der Erkennung von Fremdstoffen bzw. der Ausscheidung hat die Fasertransportleitung (2) einen rechteckigen Querschnitt, der anschliessend wieder in einen kreisförmigen oder einen beliebigen anderen Querschnitt übergeführt wird.Like from the FIGS. 1 and 2 It can be seen, has a total of 1 designated device via a fiber transport line 2, in which in loose form cotton fibers or cotton flakes be transported. The device is integrated in a per se known manner in a cleaning line and arranged for example after a bale removing machine or after a first coarse cleaner. The pneumatic transport are known in the art and not shown here. In the present embodiment, the cotton fibers are passed from bottom to top with a tendency to vertical on the sensor system or on the separation device. However, this direction could be changed arbitrarily. In the area of the detection of foreign substances or the precipitation, the fiber transport line (2) has a rectangular cross section, which is then converted again into a circular or any other cross section.

Das Sensorsystem besteht auf bekannte Weise aus zwei Kameras, beispielsweise CCD Kameras 3, 3', deren optische Achsen über Umlenkspiegel 13, 13' von beiden Seiten her auf die Fasertransportleitung gerichtet sind. Im Bereich der Beaufschlagung mittels der Kameras ist die Fasertransportleitung transparent ausgebildet und es erfolgt eine Beleuchtung mittels hier nur schematisch dargestellten Leuchten 14. Alternativ oder zusätzlich zu den Kameras 3, 3' könnte das Sensorsystem auch noch Sensoren aufweisen, die einen Fremdstoff mit anderen physikalischen Parametern erkennen können, wie z.B. Ultraschallsensoren oder Sensoren, die auf elektromagnetische Feldänderungen reagieren.The sensor system consists in known manner of two cameras, such as CCD cameras 3, 3 ', whose optical axes are directed via deflecting mirrors 13, 13' from both sides to the fiber transport line. In the field of exposure by means of the cameras, the fiber transport line is transparent and there is illumination by means of luminaires 14 shown here only schematically. Alternatively or in addition to the cameras 3, 3 ', the sensor system could also have sensors which have a foreign substance with other physical parameters can recognize, such as Ultrasonic sensors or sensors that respond to electromagnetic field changes.

In Richtung der Transportströmung a, nach der Beaufschlagung durch das Sensorsystem ist an der Fasertransportleitung 2 eine insgesamt mit 4 bezeichnete Ausscheidevorrichtung angeordnet. Diese weist auf einer Seite eine Mehrzahl von Druckluftdüsen 5 auf, welche selektiv ansteuerbar sind, je nachdem, in welchem Abschnitt das Sensorsystem einen Fremdstoff erkannt hat. Gegenüber der Druckluftdüsen 5 ist in der Wand der Fasertransportleitung eine Ausscheideöffnung 6 angeordnet, durch welche ein Fremdstoff mittels eines Ausscheideimpulses b ausgeschieden werden kann. Diese Ausscheideöffnung ist über einen Verbindungskanal 10 mit einem quer zur Fasertransportleitung 2 verlaufenden Abzugskanal 7 verbunden. Verbindungskanal und Abzugskanal bilden insgesamt eine Ableitung für den ausgeschiedenen Fremdstoff.In the direction of the transport flow a, after being acted upon by the sensor system, a separating device designated overall by 4 is arranged on the fiber transport line 2. This has on one side a plurality of compressed air nozzles 5, which are selectively controllable, depending on in which section the sensor system has detected a foreign substance. Opposite the compressed air nozzles 5 is in the wall of the fiber transport line a separating opening 6 is arranged, through which a foreign substance can be excreted by means of a separating pulse b. This separation opening is connected via a connecting channel 10 with a transverse to the fiber transport line 2 extending discharge channel 7. Connecting channel and outlet channel form a total discharge for the excreted foreign matter.

Der Verbindungskanal 10 hat ebenfalls einen etwa rechteckigen Querschnitt von der gleichen Breite, wie die Ausscheideöffnung 6. Der Verbindungskanal führt dabei tangential in den Abzugskanal 7, was insbesondere aus Figur 3 ersichtlich ist. Ein gekrümmtes Leitblech 15 bewirkt dabei eine schneckenhausartige Konfiguration im Bereich der Zusammenführung. Über dem Verbindungskanal 10 ist ausserdem ein Ansaugschlitz 9 vorgesehen, dessen Querschnitt mittels einer einstellbaren Strömungsblende 19 verändert werden kann und der sich über die gesamte Kanalbreite erstreckt. An Stelle der fest eingestellten Strömungsblende könnte auch ein sensorgesteuerter Schieber vorgesehen werden, der die Zuströmung am Ansaugschlitz in Abhängigkeit von den Druckverhältnissen steuert. Der Ansaugschlitz 9 bewirkt eine Strömung e gegen den Abzugskanal 7. Der Ansaugschlitz könnte auch relativ nahe bei der Ausscheideöffnung 6 angeordnet sein. Denkbar wäre auch ein zusätzlicher Schlitz auf der Unterseite des Verbindungskanals 10.The connecting channel 10 also has an approximately rectangular cross-section of the same width as the discharge opening 6. The connecting channel leads tangentially into the discharge channel 7, which in particular FIG. 3 is apparent. A curved baffle 15 causes a snail shell-like configuration in the area of the merge. Above the connecting channel 10, a suction slot 9 is also provided, the cross section of which can be changed by means of an adjustable flow aperture 19 and which extends over the entire channel width. Instead of the fixed flow restrictor, a sensor-controlled slide could also be provided which controls the inflow at the intake slot as a function of the pressure conditions. The intake slot 9 causes a flow e against the discharge channel 7. The intake slot could also be arranged relatively close to the discharge opening 6. It would also be conceivable to have an additional slot on the underside of the connection channel 10.

Der etwa horizontal verlaufende Abzugskanal 7 ist an einem Ende mit der Saugseite eines Ventilators 8 und von dort aus mit einem Abfallsack 12 verbunden. Alternativ könnte die Ableitung auch zu einer Abfallentsorgungsanlage führen. Das andere Ende des Abzugkanals 7 mündet an der Stirnseite des Gehäuses 17 in eine Ansaugöffnung 11, deren Öffnungsquerschnitt auf ähnliche Weise mit einer Strömungsblende eingestellt werden kann. Für die Beobachtung der Vorgänge im Abzugkanal 7 können Sichtfenster 18 angeordnet sein. Die gesamte Vorrichtung ruht auf einem Gestell 16 in einer Arbeitshöhe, welche den Einbau und die Handhabung erleichtert.The approximately horizontally extending discharge channel 7 is connected at one end to the suction side of a fan 8 and from there to a waste bag 12. Alternatively, the discharge could also lead to a waste disposal facility. The other end of the discharge channel 7 opens at the end face of the housing 17 in a suction port 11, the opening cross-section can be adjusted in a similar manner with a flow aperture. For the observation of the processes in the discharge channel 7 viewing window 18 can be arranged be. The entire device rests on a rack 16 at a working height which facilitates installation and handling.

Beim Einbau der Vorrichtung in die Linie werden die Strömungsverhältnisse mit Hilfe der genannten Strömungsblenden so eingestellt, dass im Bereich des Eintritts des Verbindungskanals 10 in den Abzugkanal 7 druckmässig praktisch Gleichgewicht zwischen der Transportströmung a in der Fasertransportleitung 2 und der Abzugströmung d im Abzugkanal 7 herrscht. Vorteilhaft wird die Strömung so eingestellt, dass ausgehend vom Ansaugschlitz 9 auch noch eine geringe Rückströmung c in Richtung Ausscheideöffnung 6 herrscht. Sobald das Sensorsystem 3, 3' einen Fremdstoff erkennt, wird im entsprechenden Abschnitt die Druckluftdüse 5 aktiviert, wobei kurzzeitig eine intensive Ausscheideströmung b quer zur Transportströmung a aufgebaut wird. Diese Ausscheideströmung reisst einen Fremdstoff 20 in den Verbindungskanal 10 (Figur 3), so dass dieser der Strömung e zugeführt wird bzw. von diesem in die Absaugströmung in der Ableitung übergeführt wird. Der Fremdstoff gelangt dabei unter das gekrümmte Leitblech 15 und kann ersichtlicherweise auch dann nicht mehr in den Verbindungskanal 10 zurückströmen, wenn die Ausscheideströmung b ausgesetzt hat. Der Fremdstoff verbleibt jetzt in der Abzugströmung d und wird unmittelbar entsorgt. Der Durchmesser des Abzugskanals 7 könnte sich ausgehend von der Ansaugöffnung 11 vergrössern, um derart über die ganze Breite des Verbindungskanals gleiche Druckverhältnisse zu schaffen bzw. um einen resultierenden Druckabfall zu kompensieren.When installing the device in the line, the flow conditions are adjusted by means of said flow orifices so that virtually equilibrium between the transport flow a in the fiber transport line 2 and the take-off flow d prevails in the discharge channel 7 in the region of entry of the connecting channel 10 in the discharge channel 7. Advantageously, the flow is adjusted so that, starting from the intake slot 9, even a small return flow c in the direction of the discharge opening 6 prevails. As soon as the sensor system 3, 3 'detects an impurity, the compressed-air nozzle 5 is activated in the corresponding section, with an intensive excretion flow b being built up transversely to the transport flow a for a short time. This excretion flow tears a foreign substance 20 into the connection channel 10 (FIG. FIG. 3 ), so that it is supplied to the flow e or is transferred from this into the suction flow in the discharge. The foreign matter passes under the curved guide plate 15 and can obviously no longer flow back into the connecting channel 10 when the excretion flow b has been suspended. The foreign matter now remains in the withdrawal flow d and is disposed of immediately. The diameter of the discharge channel 7 could increase starting from the intake opening 11, so as to create equal pressure conditions over the entire width of the connecting channel or to compensate for a resulting pressure drop.

Beim alternativen Ausführungsbeispiel gemäss Figur 4 verläuft die Strömung a in der pneumatischen Transportleitung 2 von oben nach unten. Der Verbindungskanal 10 ausgehend von der Ausscheideöffnung 6 mündet nicht in einen quer dazu verlaufenden Abzugskanal, sondern geht leicht gekrümmt direkt in den Abzugskanal 7 über, der sich anschliessend im Querschnitt wieder zu einem Rohr verjüngt, in welchem ein Förderventilator 8 angeordnet ist. Ersichtlicherweise ist hier nur eine einzige Ansaugöffnung in der Form eines Ansaugschlitzes 9 vorgesehen. Dessen Ansaugquerschnitt könnte ebenfalls verstellbar sein.In the alternative embodiment according to FIG. 4 runs the flow a in the pneumatic transport line 2 from top to bottom. The connecting channel 10, starting from the separating opening 6, does not open into a transversely extending discharge channel, but slightly curved directly into the discharge channel 7, which then tapers in cross section again to a tube in which a delivery fan 8 is arranged. Evidently, only a single suction opening in the form of a suction slot 9 is provided here. Its suction cross section could also be adjustable.

Claims (15)

  1. Method for removing foreign substances in fibrous materials, in particular in raw cotton, the fibrous materials being led successively past a sensor system (3) and a removal device (4) in a pneumatic fibre transport conduit (1) and, when foreign substances are detected by the sensor system, these being removed from the fibre transport conduit through a removal opening (6) in the latter by means of a compressed air pulse oriented transversely with respect to the fibre transport conduit, characterized in that the foreign substances are removed into a discharge conduit (7, 10) connected to the removal opening (6), there being a direct connection of the fibre transport conduit to the discharge conduit and a permanent air flow being maintained in the discharge conduit to transport the foreign substances away.
  2. Method according to Claim 1, characterized in that the air flow in the discharge conduit (7) is adjusted in such a way that, when the removal device is inactive, a slight partial flow (c) prevails continuously from the discharge conduit (7) into the fibre transport conduit (2).
  3. Method according to Claim 1 or 2, characterized in that the air flow in the discharge conduit is maintained by sucking in atmospheric air, at least a flow (e) prevailing, which runs away from the removal opening (6) in the direction of the removal pulse.
  4. Method according to one of Claims 1 to 3, characterized in that the flow of the removal pulse is supplied with the aid of a guide element (15) approximately tangentially to a further extraction flow running transversely with respect to this flow.
  5. Method according to one of Claims 1 to 4, characterized in that, in relation to the width of the fibre transport conduit (2) and the removal opening (6), the removal is carried out selectively by means of a compressed air pulse only in that section in which the sensor system has detected a foreign substance.
  6. Device for removing foreign substances in fibrous materials, in particular in raw cotton, having a pneumatic fibre transport conduit (2) on which, one after another in the transport direction, there are arranged a sensor system (3) for the detection of foreign substances and a removal device (4) having at least one compressed air nozzle (5) acting transversely with respect to the fibre transport conduit, the fibre transport conduit having a removal opening (6) opposite the compressed air nozzle, characterized in that the removal opening (6) is connected to a discharge conduit (7, 10) in such a way that there is a direct connection of the fibre transport conduit to the discharge conduit, it being possible for a permanent air flow to be maintained in the discharge conduit to transport the removed foreign substances away.
  7. Device according to Claim 6, characterized in that the air flow in the discharge conduit can be adjusted by means of adjustment means in such a way that, when the removal device is inactive, a slight partial flow (c) can be maintained continuously from the discharge conduit (7) into the fibre transport conduit (2).
  8. Device according to Claim 6 or 7, characterized in that the discharge conduit (7) is connected to a suction device (8), it being possible for air to be sucked in from the atmosphere, at least to some extent, via a suction opening, preferably via a suction slot (9), in such a way that a flow (e) acting away from the removal opening in the direction of the removal pulse can be produced.
  9. Device according to one of Claims 6 to 8, characterized in that the discharge conduit has a connecting duct (10) following the removal opening (6) and an extraction duct (7) running transversely thereto.
  10. Device according to Claim 8 and Claim 9, characterized in that the connecting duct (10) preferably enters the extraction duct (7) tangentially, and in that the suction opening (9) is arranged in the region of the entry.
  11. Device according to Claim 9 or 10, characterized in that, in the region of the entry of the connecting duct (10) into the extraction duct (7), there is arranged a guide element (15), which extends in the longitudinal direction of the extraction duct and which feeds the flow of the removal pulse approximately tangentially to a further extraction flow in the extraction duct and which prevents a reverse flow into the connecting duct.
  12. Device according to one of Claims 6 to 11, characterized in that the discharge conduit (7, 10) is connected to a suction device (8), it being possible for air to be sucked in from the atmosphere through preferably a plurality of suction openings (9,11), and in that the cross sections of the suction openings can be adjusted.
  13. Device according to one of Claims 6 to 12, characterized in that a plurality of compressed air nozzles that can be activated selectively are arranged on the fibre transport conduit (2).
  14. Device according to one of Claims 6 to 13, characterized in that the discharge conduit (7, 10) is connected to a waste container or to a waste sack (12).
  15. Device according to one of Claims 6 to 13, characterized in that the discharge conduit (7, 10) is connected to a disposal device.
EP05816080A 2005-01-25 2005-11-04 Method and device for removing foreign matters from a fibre material, in particular from raw cotton Expired - Lifetime EP1841908B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1152005 2005-01-25
PCT/EP2005/055746 WO2006079426A1 (en) 2005-01-25 2005-11-04 Method and device for removing foreign matters from a fibre material, in particular from raw cotton

Publications (2)

Publication Number Publication Date
EP1841908A1 EP1841908A1 (en) 2007-10-10
EP1841908B1 true EP1841908B1 (en) 2010-08-11

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EP05816080A Expired - Lifetime EP1841908B1 (en) 2005-01-25 2005-11-04 Method and device for removing foreign matters from a fibre material, in particular from raw cotton

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EP (1) EP1841908B1 (en)
CN (1) CN101076625B (en)
AT (1) ATE477357T1 (en)
DE (1) DE502005010091D1 (en)
WO (1) WO2006079426A1 (en)

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DE10347006B4 (en) * 2003-10-07 2020-10-15 Hubert Hergeth Hopper suction for foreign parts

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DE102007005047A1 (en) * 2007-01-26 2008-07-31 TRüTZSCHLER GMBH & CO. KG Spinning preparation apparatus for cutting foreign matter on a high-speed roll for opening or removing fiber material, e.g. Cotton, chemical fibers or the like
DE102007005049A1 (en) * 2007-01-26 2008-07-31 TRüTZSCHLER GMBH & CO. KG Apparatus in the spinning preparation for depositing foreign matter on a conveyor for fibrous material, e.g. Cotton, chemical fibers or the like
WO2017190259A1 (en) 2016-05-04 2017-11-09 Uster Technologies Ag Monitoring contamination in a stream of fiber flocks
WO2019173929A1 (en) 2018-03-14 2019-09-19 Uster Technologies Ag Optimization of a spinning process with regard to foreign materials
WO2020154820A1 (en) 2019-01-31 2020-08-06 Uster Technologies Ag Optimizing a spinning process with respect to foreign materials
CH716607A1 (en) 2019-09-17 2021-03-31 Uster Technologies Ag Method and device for monitoring foreign materials in a textile fiber structure.
CZ308782B6 (en) 2020-05-22 2021-05-12 Rieter Cz S.R.O. Method of regulating the flow or pressure in a waste transport device when preparing fibre and equipment
WO2022133616A1 (en) 2020-12-22 2022-06-30 Uster Technologies Ag Device and method for removing foreign materials from a fiber flow
CH719054A9 (en) 2021-10-12 2023-06-30 Uster Technologies Ag Optical characterization of a textile fiber structure.
CN114232141A (en) * 2022-01-23 2022-03-25 陕西长岭纺织机电科技有限公司 A foreign fiber removal device for foreign fiber removal machine

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EP0879905A1 (en) * 1997-05-20 1998-11-25 Jossi Holding AG Method and apparatus for the detection and removal of foreign substances in fibre material
DE59808078D1 (en) * 1998-09-07 2003-05-28 Jossi Holding Ag Islikon Method and device for separating foreign substances in fiber material, in particular in raw cotton
EP0987355A1 (en) * 1998-09-14 2000-03-22 Jossi Holding AG Apparatus and method for detection and removing foreign material
DE10055953A1 (en) * 2000-11-11 2002-05-23 Hubert A Hergeth Sensor detects foreign bodies in an airborne flow of textile fibres to activate a diversion valve to a trap

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DE10347006B4 (en) * 2003-10-07 2020-10-15 Hubert Hergeth Hopper suction for foreign parts

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DE502005010091D1 (en) 2010-09-23
EP1841908A1 (en) 2007-10-10
WO2006079426A1 (en) 2006-08-03
CN101076625A (en) 2007-11-21
ATE477357T1 (en) 2010-08-15
CN101076625B (en) 2011-06-29

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