EP3184679B1 - Method for operating an open-ended rotor spinning device and open ended rotor spinning machine with a multitude of open-ended rotor spinning devices side by side - Google Patents

Method for operating an open-ended rotor spinning device and open ended rotor spinning machine with a multitude of open-ended rotor spinning devices side by side Download PDF

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Publication number
EP3184679B1
EP3184679B1 EP16200132.5A EP16200132A EP3184679B1 EP 3184679 B1 EP3184679 B1 EP 3184679B1 EP 16200132 A EP16200132 A EP 16200132A EP 3184679 B1 EP3184679 B1 EP 3184679B1
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EP
European Patent Office
Prior art keywords
rotor
spinning
open
cover element
vacuum
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EP16200132.5A
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German (de)
French (fr)
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EP3184679A1 (en
Inventor
Nour-Eddine Balboul
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Saurer Spinning Solutions GmbH and Co KG
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Saurer Spinning Solutions GmbH and Co KG
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H4/00—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
    • D01H4/04—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques imparting twist by contact of fibres with a running surface
    • D01H4/08—Rotor spinning, i.e. the running surface being provided by a rotor
    • D01H4/10—Rotors
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H4/00—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
    • D01H4/04—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques imparting twist by contact of fibres with a running surface
    • D01H4/22—Cleaning of running surfaces
    • D01H4/24—Cleaning of running surfaces in rotor spinning
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H4/00—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
    • D01H4/04—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques imparting twist by contact of fibres with a running surface
    • D01H4/08—Rotor spinning, i.e. the running surface being provided by a rotor
    • D01H4/12—Rotor bearings; Arrangements for driving or stopping
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H4/00—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
    • D01H4/42—Control of driving or stopping
    • D01H4/44—Control of driving or stopping in rotor spinning

Definitions

  • the present invention relates to a method for operating an open-end rotor spinning device and an open-end rotor spinning machine with a plurality of open-end rotor spinning devices arranged next to one another.
  • Open-end rotor spinning machines have a large number of work stations arranged next to one another.
  • An open-end rotor spinning device is arranged at each of the work stations.
  • An open-end rotor spinning device comprises a rotor housing with a cover element for closing the rotor housing.
  • a spinning rotor is arranged in the rotor housing.
  • the spinning rotor is rotatably mounted.
  • the spinning rotor can be driven in various ways for spinning. It is known to drive the spinning rotors of several open-end rotor spinning devices via a common drive. The force can be transmitted from the common drive to the spinning rotors, for example by means of a belt. It is also known that an individual electromotive drive is assigned to each spinning rotor. In connection with an individual drive, the spinning rotor is preferably supported without contact.
  • a contactless mounting can be designed as a magnetic mounting. Contactlessly mounted spinning rotors with individual drives are particularly sensitive to contamination.
  • a negative pressure is required in the rotor housing for spinning. Therefore, known open-end rotor spinning machines have a central vacuum source and a machine-long vacuum line. The vacuum supply to the open-end rotor spinning devices is implemented by connecting the rotor housing to the machine-length vacuum line.
  • fiber material is introduced into the rotor housing via a fiber guide channel and the finished spun thread is withdrawn from the rotor housing via a thread take-off channel.
  • the end of the thread take-off channel on the spinning rotor side is located on an approach which is attached to the cover element and protrudes into the spinning rotor.
  • the DE 10 2004 016 547 B4 discloses a method of cleaning a spinning rotor.
  • the cleaning is already carried out on the spinning rotor which is still turning or running out.
  • the cover element of the rotor housing is automatically opened by means of a movable maintenance device device and a cleaning device is fed to the spinning rotor, whereby the speed of the spinning rotor has not yet fallen below a minimum.
  • fiber rings collect, which are held in the rotor groove by the centrifugal forces.
  • the cleaning device should intervene before a fiber ring is released from the rotor groove.
  • Such a cleaning device can, for example, seal the outer annular space surrounding the spinning rotor and thus prevent the fibers from escaping.
  • the method is intended to prevent fibers from wrapping themselves around the attachment with the thread take-off channel and being pulled out of the spinning rotor when the cover element is opened.
  • the cover of the vacuum chamber should only be moved a small distance away from the vacuum chamber before the open-end spinning rotor comes to a standstill and then the vacuum chamber again briefly getting closed. In this way, a fiber ring present in the interior of the rotor can be removed more easily before the actual cleaning.
  • a housing with a spinning rotor is known, which is connected to a vacuum line, wherein a valve is located in the vacuum line to bring the spinning vacuum into or out of action as required.
  • a valve is located in the vacuum line to bring the spinning vacuum into or out of action as required.
  • a method for operating an open-end rotor spinning device For spinning, a rotor housing is closed with a cover element and subjected to negative pressure by means of a negative pressure supply, a spinning rotor rotates in the rotor housing and an attachment attached to the cover element protrudes into the spinning rotor with a thread take-off channel.
  • the method according to the invention starts with this finding. Accordingly, the negative pressure in the rotor housing should be eliminated before the centrifugal forces no longer hold a fiber ring located in the rotor groove in the rotor groove. By releasing the negative pressure, the air flow described above is prevented. A fiber ring that has collapsed due to the decreasing centrifugal forces thus remains in the interior of the spinning rotor. In contrast to what is described in the prior art, it is therefore not necessary for a cleaning device to intervene as quickly as possible. Rather, the fibers located in the interior of the spinning rotor can later be sucked off in a simple manner by moving the cover element when the negative pressure is restored. The method according to the invention therefore does not require any additional cleaning device. The cover element can be moved by an adjusting device at the work site.
  • the cover element When the cover element is moved between an open position and a closed position, the cover element passes through a position in which the cover element is opened so far that there is sufficient space between the attachment and the spinning rotor, and the cover element is closed so far that a sufficient There is negative pressure in the rotor housing in order to suck off the fibers.
  • the displacement of the cover element can take place when the spinning rotor is still rotating or when the spinning rotor is already at a standstill. It is only important that the speed falls below the second speed at which the fiber ring has already collapsed. Otherwise the shift would be counterproductive and would do exactly what the present invention is intended to prevent, namely that fibers wrap around the attachment.
  • One possibility is to move the cover element into the open position. Even if the vacuum supply continues to suck air out of the rotor housing, the air is immediately replenished via the opening, so that there is no vacuum in the rotor housing.
  • the vacuum supply of the open-end rotor spinning device is switched on.
  • the cover element initially also remains closed.
  • Switching off the vacuum supply has the advantage that a vacuum source of the open-end rotor spinning machine is less stressed and energy is saved.
  • the energy consumption of the vacuum source is significantly higher with an open rotor housing than with a closed rotor housing.
  • the cover element is transferred from the open position to the closed position for suction of the collapsed fiber ring below the second speed with an effective vacuum supply.
  • This process step can be carried out independently of the previous history. If the removal of the negative pressure in the rotor housing was achieved by opening the cover element without the negative pressure supply having been switched off, the negative pressure supply is effective and the cover element can be transferred directly into the closed position. If the negative pressure has been eliminated by switching off the negative pressure supply, the cover element can be opened at some point. As long as the vacuum supply is switched off, opening the cover element has no effect. Before closing the cover element, however, the vacuum supply must be switched on again so that the fiber ring that has collapsed is also sucked off when it is closed.
  • the collapsed fiber ring can also be suctioned off by moving the cover element from the closed position to the open position below the second speed with an effective vacuum supply.
  • an effective vacuum supply Such a procedure is particularly advisable if, according to the invention, the cancellation of the negative pressure was achieved by switching off the negative pressure supply.
  • the vacuum supply must then be switched on again before opening, preferably with the spinning rotor at a standstill.
  • the object is also achieved by an open-end rotor spinning machine for carrying out the method according to the invention with a large number of open-end rotor spinning devices arranged next to one another.
  • the open-end rotor spinning devices each have a rotor housing, a spinning rotor arranged in the rotor housing, a cover element for closing the rotor housing, which can be displaced between an open position and a closed position, an adjusting device for displacing the cover element between the open position and the closed position, and one on the cover element attached approach with a thread take-off channel that protrudes into the spinning rotor in the closed position, and a vacuum supply for applying vacuum to the rotor housing.
  • a control device is designed to control one or more open-end rotor spinning devices when the spinning rotor is braked in such a way that the negative pressure in the rotor housing above a first speed at which the centrifugal forces still hold a fiber ring in the rotor groove of the spinning rotor is canceled becomes. Furthermore, the control device is designed to control one or more open-end rotor spinning devices in such a way that the fiber ring by moving the cover element between the open position and the closed position below a second speed at which the fiber ring has already collapsed due to the decreasing centrifugal forces due to the Rotor housing restored negative pressure is sucked off.
  • the control device is designed to close the valve for switching off the vacuum supply above the first speed.
  • control device is designed to control the actuating device in such a way that the cover element is transferred from the open position to the closed position below the second speed with an effective vacuum supply.
  • the control device can furthermore be designed to control the actuating device in such a way that the cover element is transferred from the closed position to the open position below the second speed with an effective vacuum supply.
  • the illustrated open-end rotor spinning device of an open-end rotor spinning machine bears the overall reference number 1.
  • such open-end rotor spinning devices each have a rotor housing 2 in which a spinning rotor 3 rotates at high speed n.
  • the spinning rotor 3 is set in rotation by an individual electromotive drive 33.
  • the drive 33 also contains the magnetic mounting of the spinning rotor 3.
  • Fig. 1 As can be seen, the rotor housing 2, which is open to the front, is closed during the spinning operation by a pivotably mounted cover element 8 into which a channel plate (not shown in detail) with a seal 9 is embedded.
  • the rotor housing 2 is also connected via a corresponding vacuum line 10 to a vacuum source 11, which generates the spinning vacuum required in the rotor housing 2 during the spinning process.
  • the vacuum line 10 forms the vacuum supply to the open-end rotor spinning device 1.
  • the vacuum source 11 also supplies the remaining open-end rotor spinning devices of the open-end rotor spinning machine.
  • the vacuum line 10 has a valve 31.
  • a projection 12 is arranged, which has the rotor-side end 13 of the thread take-off channel 15 and the opening area of the fiber guide channel 14.
  • an opening roller housing 17 is fixed on the cover element 8, which is mounted so as to be rotatable to a limited extent about a pivot axis 16.
  • the cover element 8 also has individual drives 19, 20 on the rear for an opening roller 21 or a sliver intake cylinder 22.
  • an adjusting device 32 designed as a pneumatic cylinder is provided on the open-end rotor spinning device 1.
  • the Fig. 1 shows the cover element in a closed position.
  • the cover element 8 pivots about the pivot axis 16 away from the rotor housing 2.
  • the cover element 8 can thus be transferred into an open position.
  • it is not absolutely necessary that the spinning rotor is freely accessible. It is sufficient if the ambient air can penetrate unhindered. This is achieved in that the seal 9 is completely spaced from the rotor housing 2.
  • the open-end rotor spinning device 1 is assigned a control device 34.
  • the control device 34 controls the actuating device 32 and the valve 31 if necessary.
  • the control device 34 is also designed to control the individual electromotive drive 33.
  • the control device 34 can have connections to other elements of the work station or the open-end rotor spinning machine.
  • Fig. 2 the spinning rotor 3 and the extension 12 protruding into the spinning rotor 3 with the thread take-up channel 15 are shown only schematically in order to illustrate the flow conditions in the spinning rotor 3.
  • the spinning rotor 3 via the in Fig. 2 Fiber guide channel 14, not shown, is supplied with a sliver.
  • the fibers form a fiber ring 5 in the rotor groove 4.
  • the fibers collected in the rotor groove 4 are continuously tied into the thread end and the thread through the thread take-off channel 15 deducted.
  • the open-end rotor spinning device is stopped, for example after a thread break, the fiber ring 5 initially remains in the rotor groove 4 due to the centrifugal forces.
  • the centrifugal forces decrease accordingly as the speed decreases.
  • the cover element 8 is closed and the vacuum supply 10 is active, that is to say when the valve 31 is open, air is sucked into the rotor housing 2 through the thread take-off channel 15.
  • the arrows 40 indicate the air flow resulting therefrom.
  • the centrifugal forces no longer hold the fiber ring 5 in the rotor groove 4
  • the air flow 40 brings the fiber ring 5 out of the rotor groove 4 into the area between the extension 15 and the side walls 41 of the spinning rotor 3 Fig. 2 the fiber ring 5 '.
  • the fibers screw themselves around the attachment 12.
  • the fibers can thus move out of the interior of the spinning rotor and can reach the area behind the rear wall 42 of the spinning rotor via the spinning rotor 3. From there, the fibers pass into the drive 33.
  • the aim of the present invention is to prevent this.
  • the Fig. 3 shows a course of the speed n when braking the spinning rotor 3, plotted over time t.
  • the spinning rotor 3 initially rotates at the spinning speed n 0 .
  • the speed n is reduced and thereby passes the speed n 1 .
  • the speed n 1 is set in such a way that the centrifugal forces still hold the fiber ring 5 securely in the rotor groove 5 at this speed.
  • Above the speed n 1 the negative pressure in the rotor housing is canceled.
  • the vacuum supply 10 is switched off by closing the valve 31.
  • the control of the valve 31 takes place by means of the control device 34.
  • the fiber ring 5 has already collapsed due to the decreasing centrifugal forces.
  • the fibers remain inside the spinning rotor 3.
  • the fibers of the collapsed fiber ring 5 can be sucked off in the manner already described by moving the cover element 8.
  • the actuating device 32 and / or the valve 31 of the control device 34 are also activated for this purpose.
  • the speeds n 1 and n 2 are dependent on various variables, in particular on the rotor diameter, but also on the processed fiber material.
  • the speeds, in which the negative pressure is removed and the fibers are sucked off, can be determined on a part-related basis and stored in the control device 34.

Description

Die vorliegende Erfindung betrifft ein Verfahren zum Betreiben einer Offenend-Rotorspinneinrichtung und eine Offenend-Rotorspinnmaschine mit einer Vielzahl nebeneinander angeordneter Offenend-Rotorspinneinrichtungen.The present invention relates to a method for operating an open-end rotor spinning device and an open-end rotor spinning machine with a plurality of open-end rotor spinning devices arranged next to one another.

Offenend-Rotorspinnmaschinen weisen eine Vielzahl nebeneinander angeordneter Arbeitsstellen auf. An den Arbeitsstellen ist jeweils eine Offenend-Rotorspinneinrichtung angeordnet. Eine Offenend-Rotorspinneinrichtung umfasst ein Rotorgehäuse mit einem Deckelelement zum Verschließen des Rotorgehäuses. In dem Rotorgehäuse ist ein Spinnrotor angeordnet. Der Spinnrotor ist drehbar gelagert. Der Spinnrotor kann zum Spinnen auf verschiedene Weise angetrieben werden. Es ist bekannt, die Spinnrotoren mehrerer Offenend-Rotorspinneinrichtungen über einen gemeinsamen Antrieb anzutreiben. Die Kraft kann von dem gemeinsamen Antrieb auf die Spinnrotoren beispielsweise mittels eines Riemens übertragen werden. Es ist auch bekannt, dass jedem Spinnrotor ein elektromotorischer Einzelantrieb zugeordnet ist. In Verbindung mit einem Einzelantrieb ist der Spinnrotor vorzugsweise berührungslos gelagert. Eine berührungslose Lagerung kann als magnetische Lagerung ausgebildet sein. Berührungslos gelagerte Spinnrotoren mit Einzelantrieben sind besonders empfindlich gegen Verschmutzungen.Open-end rotor spinning machines have a large number of work stations arranged next to one another. An open-end rotor spinning device is arranged at each of the work stations. An open-end rotor spinning device comprises a rotor housing with a cover element for closing the rotor housing. A spinning rotor is arranged in the rotor housing. The spinning rotor is rotatably mounted. The spinning rotor can be driven in various ways for spinning. It is known to drive the spinning rotors of several open-end rotor spinning devices via a common drive. The force can be transmitted from the common drive to the spinning rotors, for example by means of a belt. It is also known that an individual electromotive drive is assigned to each spinning rotor. In connection with an individual drive, the spinning rotor is preferably supported without contact. A contactless mounting can be designed as a magnetic mounting. Contactlessly mounted spinning rotors with individual drives are particularly sensitive to contamination.

Zum Spinnen ist ein Unterdruck in dem Rotorgehäuse erforderlich. Deshalb weisen bekannte Offenend-Rotorspinnmaschinen eine zentrale Unterdruckquelle und eine maschinenlange Unterdruckleitung auf. Die Unterdruckversorgung der Offenend-Rotorspinneinrichtungen wird durch einen Anschluss des Rotorgehäuses an die maschinenlange Unterdruckleitung realisiert.A negative pressure is required in the rotor housing for spinning. Therefore, known open-end rotor spinning machines have a central vacuum source and a machine-long vacuum line. The vacuum supply to the open-end rotor spinning devices is implemented by connecting the rotor housing to the machine-length vacuum line.

Im Spinnbetrieb wird über einen Faserleitkanal Fasermaterial in das Rotorgehäuse eingeführt und der fertig gesponnene Faden wird über einen Fadenabzugskanal aus dem Rotorgehäuse abgezogen. Das spinnrotorseitige Ende des Fadenabzugskanals befindet sich an einem Ansatz, der an dem Deckelelement befestigt ist und in den Spinnrotor ragt.During the spinning operation, fiber material is introduced into the rotor housing via a fiber guide channel and the finished spun thread is withdrawn from the rotor housing via a thread take-off channel. The end of the thread take-off channel on the spinning rotor side is located on an approach which is attached to the cover element and protrudes into the spinning rotor.

Die DE 10 2004 016 547 B4 offenbart ein Verfahren zum Reinigen eines Spinnrotors. Die Reinigung wird bereits am noch drehenden oder auslaufenden Spinnrotor durchgeführt. Dazu wird das Deckelelement des Rotorgehäuses mittels einer verfahrbaren Wartungseinrichtungseinrichtung automatisch geöffnet und dem Spinnrotor eine Reinigungseinrichtung zugestellt, wobei eine Mindestdrehzahl des Spinnrotors noch nicht unterschritten ist. In der Rotorrille des Spinnrotors sammeln sich Faserringe, die durch die Fliehkräfte in der Rotorrille gehalten werden. Die Reinigungseinrichtung soll eingreifen, bevor sich ein Faserring aus der Rotorrille löst. Eine solche Reinigungseinrichtung kann zum Beispiel den äußeren, den Spinnrotor umgebenen Ringraum abdichten und so ein Austreten der Fasern verhindern. Das Verfahren soll verhindern, dass sich Faser um den Ansatz mit dem Fadenabzugskanal legen und beim Öffnen des Deckelelementes aus dem Spinnrotor herausgezogen werden.The DE 10 2004 016 547 B4 discloses a method of cleaning a spinning rotor. The cleaning is already carried out on the spinning rotor which is still turning or running out. For this purpose, the cover element of the rotor housing is automatically opened by means of a movable maintenance device device and a cleaning device is fed to the spinning rotor, whereby the speed of the spinning rotor has not yet fallen below a minimum. In the rotor groove of the spinning rotor, fiber rings collect, which are held in the rotor groove by the centrifugal forces. The cleaning device should intervene before a fiber ring is released from the rotor groove. Such a cleaning device can, for example, seal the outer annular space surrounding the spinning rotor and thus prevent the fibers from escaping. The method is intended to prevent fibers from wrapping themselves around the attachment with the thread take-off channel and being pulled out of the spinning rotor when the cover element is opened.

Darüber hinaus können sich beim Bremsen des Spinnrotors nicht nur Fasern um den Ansatz mit dem Fadenabzugskanal legen, sondern es können sich die Fasern bei geschlossenem Deckelelement zwischen der Außenwand des Spinnrotors und dem Ansatz bewegen und hinter den Spinnrotor gelangen. Die Fasern können dann die Lagerung verschmutzen und es kann zu Ausfällen der Offenend-Rotorspinneinrichtungen kommen. Besonders empfindlich gegen Verschmutzungen sind auch elektromotorische Einzelantriebe, die hinter dem Spinnrotor angeordnet sind. Bei berührungslosen Lagerungen können Verschmutzungen des Lagerluftspaltes schnell zu Fehlern führen.In addition, when the spinning rotor is braked, not only can fibers lie around the attachment with the thread take-off channel, but the fibers can move between the outer wall of the spinning rotor and the attachment and get behind the spinning rotor when the cover element is closed. The fibers can then contaminate the bearing and the open-end rotor spinning devices can fail. Individual electromotive drives that are arranged behind the spinning rotor are also particularly sensitive to contamination. With contactless bearings, contamination of the bearing air gap can quickly lead to errors.

Das in der DE 10 2004 016 547 B4 beschriebene Verfahren würde zwar eine Verschmutzung des Antriebes und der Lagerung verhindern; die Reinigungseinrichtung ist jedoch relativ aufwendig und bei jedem Bremsvorgang müsste zuerst die Wartungseinrichtung vor der Offenend-Rotorspinneinrichtung positioniert werden.That in the DE 10 2004 016 547 B4 The method described would prevent contamination of the drive and the storage; however, the cleaning device is relatively complex and for each braking process the maintenance device would first have to be positioned in front of the open-end rotor spinning device.

Gemäß der DE° 199 56 264 A1 soll die Abdeckung der Unterdruckkammer bevor der Offenend-Spinnrotor zum Stillstand kommt nur ein kleines Stück von der Unterdruckkammer wegbewegt und danach die Unterruckkammer nochmals kurz geschlossen werden. Auf diese Weise lässt sich vor dem eigentlichen Reinigen ein im Rotorinneren vorhandener Faserring leichter Entfernen.According to the DE ° 199 56 264 A1 the cover of the vacuum chamber should only be moved a small distance away from the vacuum chamber before the open-end spinning rotor comes to a standstill and then the vacuum chamber again briefly getting closed. In this way, a fiber ring present in the interior of the rotor can be removed more easily before the actual cleaning.

Aus der DE 42 44 081 C1 ist ein Gehäuse mit einem Spinnrotor bekannt, das an eine Unterdruckleitung angeschlossen ist, wobei sich in der Unterdruckleitung ein Ventil befindet, um den Spinnunterdruck bei Bedarf in oder außer Wirkung zu bringen. Allerdings geht es hier nicht ums Bremsen des Spinnrotors, sondern ums Anspinnen.From the DE 42 44 081 C1 a housing with a spinning rotor is known, which is connected to a vacuum line, wherein a valve is located in the vacuum line to bring the spinning vacuum into or out of action as required. However, this is not about braking the spinning rotor, but about piecing.

Es ist damit die Aufgabe der vorliegenden Erfindung, auf einfache Weise zu verhindern, dass sich beim Bremsen des Spinnrotors Fasern um den Ansatz mit der Fadenabzugsdüse legen.It is therefore the object of the present invention to prevent, in a simple manner, that when the spinning rotor is braked, fibers are laid around the attachment with the thread draw-off nozzle.

Zur Lösung der Aufgabe wird ein Verfahren zum Betreiben einer Offenend-Rotorspinneinrichtung vorgeschlagen. Zum Spinnen wird ein Rotorgehäuse mit einem Deckelelement verschlossen und mittels einer Unterdruckversorgung mit Unterdruck beaufschlagt, ein Spinnrotor rotiert in dem Rotorgehäuse und ein an dem Deckelelement befestigter Ansatz ragt mit einem Fadenabzugskanal in den Spinnrotor. Beim Bremsen des Spinnrotors wird die Drehzahl des Spinnrotors reduziert, der Unterdruck in dem Rotorgehäuse wird oberhalb einer ersten Drehzahl, bei der die Fliehkräfte einen Faserring noch in der Rotorrille des Spinnrotors halten, aufgehoben, und der Faserring wird durch Verlagerung des Deckelelementes zwischen einer Öffnungsstellung und einer Schließstellung unterhalb einer zweiten Drehzahl, bei der der Faserring aufgrund der nachlassenden Fliehkräfte bereits zusammengefallen ist, aufgrund des in dem Rotorgehäuse wiederhergestellten Unterdrucks abgesaugt.To achieve the object, a method for operating an open-end rotor spinning device is proposed. For spinning, a rotor housing is closed with a cover element and subjected to negative pressure by means of a negative pressure supply, a spinning rotor rotates in the rotor housing and an attachment attached to the cover element protrudes into the spinning rotor with a thread take-off channel. When braking the spinning rotor, the speed of the spinning rotor is reduced, the negative pressure in the rotor housing is canceled above a first speed at which the centrifugal forces still hold a fiber ring in the rotor groove of the spinning rotor, and the fiber ring is moved by moving the cover element between an open position and a closed position below a second speed at which the fiber ring has already collapsed due to the decreasing centrifugal forces, sucked off due to the negative pressure restored in the rotor housing.

Wie bereits erläutert, legen sich beim Bremsen des Spinnrotors in dem geschlossenen Rotorgehäuse Fasern um den in den Spinnrotor ragenden Ansatz. Der Grund dafür liegt aber nicht alleine in den nachlassenden Fliehkräften und der Positionierung des Ansatzes im Innenraum des Spinnrotors; vielmehr haben die Strömungsverhältnisse in dem geschlossenen Rotorgehäuse entscheidenden Einfluss. Zum Spinnen muss in dem Rotorgehäuse ein Unterdruck herrschen; beim Bremsen wird dieser Unterdruck aber zum Problem. Der Unterdruck sorgt dafür, dass über die spinntechnologisch notwendigen Öffnungen in dem Rotorgehäuse, insbesondere durch den Fadenabzugskanal, Luft in das Rotorgehäuse strömt. Dadurch ergibt sich in dem Rotorgehäuse eine Luftströmung vom Inneren des Spinnrotors vorbei an dem Ansatz heraus aus dem Spinnrotor. Aus der Rotorrille aufgrund der nachlassenden Fliehkräfte herausgefallene Fasern bewegen sich entlang der Luftströmung. Die Restdrehung des Spinnrotors unterstützt diese Bewegung noch.As already explained, when the spinning rotor brakes in the closed rotor housing, fibers are placed around the attachment protruding into the spinning rotor. The reason for this is not solely due to the decreasing centrifugal forces and the positioning of the attachment in the interior of the spinning rotor; rather, the flow conditions in the closed rotor housing have a decisive influence. For spinning, there must be a negative pressure in the rotor housing; when braking, however, this negative pressure becomes a problem. The negative pressure ensures that through the openings in the rotor housing that are necessary for spinning technology, in particular through the thread take-off channel, Air flows into the rotor housing. This results in an air flow in the rotor housing from the interior of the spinning rotor past the attachment out of the spinning rotor. Fibers that have fallen out of the rotor groove due to the decreasing centrifugal forces move along the air flow. The remaining rotation of the spinning rotor still supports this movement.

Das erfindungsgemäße Verfahren setzt bei dieser Erkenntnis an. Demnach soll der Unterdruck in dem Rotorgehäuse aufgehoben werden, bevor die Fliehkräfte einen in der Rotorrille befindlichen Faserring nicht mehr in der Rotorrille halten. Durch das Aufheben des Unterdrucks wird die oben beschriebene Luftströmung unterbunden. Ein aufgrund der nachlassenden Fliehkräfte zusammengefallender Faserring verbleibt damit im Inneren des Spinnrotors. Anders als im Stand der Technik beschrieben, ist es also nicht erforderlich, dass möglichst schnell eine Reinigungseinrichtung eingreift. Vielmehr können die im Inneren des Spinnrotors befindlichen Fasern später auf einfache Weise durch eine Verlagerung des Deckelelementes bei wiederhergestelltem Unterdruck abgesaugt werden. Damit erfordert das erfindungsgemäße Verfahren keine zusätzliche Reinigungseinrichtung. Die Verlagerung des Deckelelementes kann durch einen Stellvorrichtung an der Arbeitsstelle erfolgen.The method according to the invention starts with this finding. Accordingly, the negative pressure in the rotor housing should be eliminated before the centrifugal forces no longer hold a fiber ring located in the rotor groove in the rotor groove. By releasing the negative pressure, the air flow described above is prevented. A fiber ring that has collapsed due to the decreasing centrifugal forces thus remains in the interior of the spinning rotor. In contrast to what is described in the prior art, it is therefore not necessary for a cleaning device to intervene as quickly as possible. Rather, the fibers located in the interior of the spinning rotor can later be sucked off in a simple manner by moving the cover element when the negative pressure is restored. The method according to the invention therefore does not require any additional cleaning device. The cover element can be moved by an adjusting device at the work site.

Bei der Verlagerung des Deckelelementes zwischen einer Öffnungsstellung und einer Schließstellung wird eine Stellung des Deckelelementes durchlaufen, bei der das Deckelelement so weit geöffnet ist, dass ausreichend Platz zwischen dem Ansatz und dem Spinnrotor vorhanden ist, und das Deckelelement so weit geschlossen ist, dass ein ausreichender Unterdruck in dem Rotorgehäuse herrscht, um die Fasern abzusaugen.When the cover element is moved between an open position and a closed position, the cover element passes through a position in which the cover element is opened so far that there is sufficient space between the attachment and the spinning rotor, and the cover element is closed so far that a sufficient There is negative pressure in the rotor housing in order to suck off the fibers.

Die Verlagerung des Deckelementes kann bei noch drehendem Spinnrotor oder bei bereits stillstehendem Spinnrotor erfolgen. Wichtig ist nur, dass die zweite Drehzahl, bei der der Faserring bereits zusammengefallen ist, unterschritten ist. Ansonsten wäre die Verlagerung kontraproduktiv und würde genau das bewirken, was die vorliegende Erfindung verhindern soll, nämlich das sich Fasern um den Ansatz legen.The displacement of the cover element can take place when the spinning rotor is still rotating or when the spinning rotor is already at a standstill. It is only important that the speed falls below the second speed at which the fiber ring has already collapsed. Otherwise the shift would be counterproductive and would do exactly what the present invention is intended to prevent, namely that fibers wrap around the attachment.

Um den Unterdruck in dem Rotorgehäuse oberhalb der ersten Drehzahl aufzuheben, sind prinzipiell zwei Alternativen denkbar.In principle, two alternatives are conceivable for eliminating the negative pressure in the rotor housing above the first speed.

Die eine Möglichkeit ist die Verlagerung des Deckelelementes in die Öffnungsstellung. Auch wenn die Unterdruckversorgung weiter Luft aus dem Rotorgehäuse absaugt, wird die Luft über die Öffnung sofort nachgeliefert, so dass in dem Rotorgehäuse kein Unterdruck herrscht.One possibility is to move the cover element into the open position. Even if the vacuum supply continues to suck air out of the rotor housing, the air is immediately replenished via the opening, so that there is no vacuum in the rotor housing.

Erfindungsgemäß wird jedoch die Unterdruckversorgung der Offenend-Rotorspinneinrichtung angeschaltet. Beim Abschalten der Unterdruckversorgung bleibt das Deckelelement zunächst auch geschlossen. Das Abschalten der Unterdruckversorgung hat den Vorteil, dass eine Unterdruckquelle der Offenend-Rotorspinnmaschine weniger belastet ist und Energie gespart wird. Der Energieverbrauch der Unterdruckquelle ist bei einem geöffneten Rotorgehäuse deutlich höher als bei einem geschlossenen Rotorgehäuse.According to the invention, however, the vacuum supply of the open-end rotor spinning device is switched on. When the vacuum supply is switched off, the cover element initially also remains closed. Switching off the vacuum supply has the advantage that a vacuum source of the open-end rotor spinning machine is less stressed and energy is saved. The energy consumption of the vacuum source is significantly higher with an open rotor housing than with a closed rotor housing.

Gemäß einer möglichen Ausführungsform des erfindungsgemäßen Verfahrens wird das Deckelelement zum Absaugen des zusammengefallenen Faserrings unterhalb der zweiten Drehzahl bei wirksamer Unterdruckversorgung von der Öffnungsstellung in die Schließstellung überführt wird. Dieser Verfahrensschritt lässt sich unabhängig von der Vorgeschichte ausführen. Wurde die Aufhebung des Unterdrucks in dem Rotorgehäuse durch Öffnen des Deckelelementes erreicht, ohne dass die Unterdruckversorgung abgeschaltet wurde, ist die Unterdruckversorgung wirksam und das Deckelelement kann direkt in die Schließstellung überführt werden. Wurde die Aufhebung des Unterdrucks durch Abschalten der Unterdruckversorgung erreicht, kann das Deckelelement irgendwann geöffnet werden. Solange die Unterdruckversorgung ausgeschaltet ist, ist das Öffnen des Deckelelementes ohne Wirkung. Vor dem Schließen des Deckelelementes muss die Unterdruckversorgung allerdings wieder eingeschaltet werden, damit der zusammengefallene Faserring beim Schließen auch abgesaugt wird.According to a possible embodiment of the method according to the invention, the cover element is transferred from the open position to the closed position for suction of the collapsed fiber ring below the second speed with an effective vacuum supply. This process step can be carried out independently of the previous history. If the removal of the negative pressure in the rotor housing was achieved by opening the cover element without the negative pressure supply having been switched off, the negative pressure supply is effective and the cover element can be transferred directly into the closed position. If the negative pressure has been eliminated by switching off the negative pressure supply, the cover element can be opened at some point. As long as the vacuum supply is switched off, opening the cover element has no effect. Before closing the cover element, however, the vacuum supply must be switched on again so that the fiber ring that has collapsed is also sucked off when it is closed.

Alternativ kann der zusammengefallene Faserring auch abgesaugt werden, indem das Deckelelement unterhalb der zweiten Drehzahl bei wirksamer Unterdruckversorgung von der Schließstellung in die Öffnungsstellung überführt wird. Eine solche Vorgehensweise bietet sich vor allem an, wenn das Aufheben des Unterdrucks erfindungsgemäß durch Abschalten der Unterdruckversorgung erreicht wurde. Die Unterdruckversorgung muss dann vor dem Öffnen vorzugsweise im Stillstand des Spinnrotors wieder eingeschaltet werden.Alternatively, the collapsed fiber ring can also be suctioned off by moving the cover element from the closed position to the open position below the second speed with an effective vacuum supply. Such a procedure is particularly advisable if, according to the invention, the cancellation of the negative pressure was achieved by switching off the negative pressure supply. The vacuum supply must then be switched on again before opening, preferably with the spinning rotor at a standstill.

Die Aufgabe wird außerdem durch eine Offenend-Rotorspinnmaschine zur Durchführung des erfindungsgemäßen Verfahrens mit einer Vielzahl nebeneinander angeordneter Offenend-Rotorspinneinrichtungen gelöst. Die Offenend-Rotorspinneinrichtungen weisen jeweils ein Rotorgehäuse, einen in dem Rotorgehäuse angeordneten Spinnrotor, ein Deckelelement zum Verschließen des Rotorgehäuses, das zwischen einer Öffnungsstellung und einer Schließstellung verlagerbar ist, eine Stellvorrichtung zur Verlagerung des Deckelelementes zwischen der Öffnungsstellung und der Schließstellung, einen an dem Deckelelement befestigten Ansatz mit einem Fadenabzugskanal, der in der Schließstellung in den Spinnrotor ragt, und eine Unterdruckversorgung zur Beaufschlagung des Rotorgehäuses mit Unterdruck auf. Zur Ausführung des erfindungsgemäßen Verfahrens ist eine Steuereinrichtung dazu ausgebildet, eine oder mehrere Offenend-Rotorspinneinrichtungen beim Bremsen des Spinnrotors so anzusteuern, dass der Unterdruck in dem Rotorgehäuse oberhalb einer ersten Drehzahl, bei der die Fliehkräfte einen Faserring noch in der Rotorrille des Spinnrotors halten, aufgehoben wird. Weiter ist die Steuereinrichtung dazu ausgebildet, eine oder mehrere Offenend-Rotorspinneinrichtungen so anzusteuern, dass der Faserring durch Verlagerung des Deckelelementes zwischen der Öffnungsstellung und der Schließstellung unterhalb einer zweiten Drehzahl, bei der der Faserring aufgrund der nachlassenden Fliehkräfte bereits zusammengefallen ist, aufgrund des in dem Rotorgehäuse wiederhergestellten Unterdrucks abgesaugt wird.The object is also achieved by an open-end rotor spinning machine for carrying out the method according to the invention with a large number of open-end rotor spinning devices arranged next to one another. The open-end rotor spinning devices each have a rotor housing, a spinning rotor arranged in the rotor housing, a cover element for closing the rotor housing, which can be displaced between an open position and a closed position, an adjusting device for displacing the cover element between the open position and the closed position, and one on the cover element attached approach with a thread take-off channel that protrudes into the spinning rotor in the closed position, and a vacuum supply for applying vacuum to the rotor housing. To carry out the method according to the invention, a control device is designed to control one or more open-end rotor spinning devices when the spinning rotor is braked in such a way that the negative pressure in the rotor housing above a first speed at which the centrifugal forces still hold a fiber ring in the rotor groove of the spinning rotor is canceled becomes. Furthermore, the control device is designed to control one or more open-end rotor spinning devices in such a way that the fiber ring by moving the cover element between the open position and the closed position below a second speed at which the fiber ring has already collapsed due to the decreasing centrifugal forces due to the Rotor housing restored negative pressure is sucked off.

Erfindungsgemäß ist ein Ventil zur Abschaltung der Unterdruckversorgung vorhanden und die Steuereinrichtung ist dazu ausgebildet, zur Abschaltung der Unterdruckversorgung oberhalb der ersten Drehzahl das Ventil zu schließen.According to the invention, there is a valve for switching off the vacuum supply and the control device is designed to close the valve for switching off the vacuum supply above the first speed.

Gemäß einer Weiterbildung der erfindungsgemäßen Offenend-Rotorspinnmaschine ist die Steuereinrichtung dazu ausgebildet, die Stellvorrichtung so anzusteuern, dass das Deckelelement unterhalb der zweiten Drehzahl bei wirksamer Unterdruckversorgung von der Öffnungsstellung in die Schließstellung überführt wird.According to a further development of the open-end rotor spinning machine according to the invention, the control device is designed to control the actuating device in such a way that the cover element is transferred from the open position to the closed position below the second speed with an effective vacuum supply.

Die Steuereinrichtung kann ferner dazu ausgebildet sein, die Stellvorrichtung so anzusteuern, dass das Deckelelement unterhalb der zweiten Drehzahl bei wirksamer Unterdruckversorgung von der Schließstellung in die Öffnungsstellung überführt wird.The control device can furthermore be designed to control the actuating device in such a way that the cover element is transferred from the closed position to the open position below the second speed with an effective vacuum supply.

Die Erfindung wird nachfolgend anhand eines in den Zeichnungen dargestellten Ausführungsbeispiels näher erläutert.The invention is explained in more detail below with reference to an exemplary embodiment shown in the drawings.

Es zeigen:

Fig. 1
eine Seitenansicht einer Offenend-Rotorspinneinrichtung einer erfindungsgemäßen Offenend-Rotorspinnmaschine;
Fig. 2
eine Darstellung der Strömungsverhältnisse in einem Spinnrotor
Fig. 3
Drehzahlverlauf beim Bremsen des Spinnrotors.
Show it:
Fig. 1
a side view of an open-end rotor spinning device of an open-end rotor spinning machine according to the invention;
Fig. 2
a representation of the flow conditions in a spinning rotor
Fig. 3
Speed curve when braking the spinning rotor.

Die in Fig. 1 dargestellte Offenend-Rotorspinneinrichtung einer Offenend-Rotorspinnmaschine trägt insgesamt die Bezugszahl 1. Solche Offenend-Rotorspinnvorrichtungen verfügen, wie bekannt, jeweils über ein Rotorgehäuse 2, in dem ein Spinnrotor 3 mit hoher Drehzahl n umläuft. Der Spinnrotor 3 wird durch einen elektromotorischen Einzelantrieb 33 in Drehung versetzt. Der Antrieb 33 beinhaltet gleichzeitig die magnetische Lagerung des Spinnrotors 3.In the Fig. 1 The illustrated open-end rotor spinning device of an open-end rotor spinning machine bears the overall reference number 1. As is known, such open-end rotor spinning devices each have a rotor housing 2 in which a spinning rotor 3 rotates at high speed n. The spinning rotor 3 is set in rotation by an individual electromotive drive 33. The drive 33 also contains the magnetic mounting of the spinning rotor 3.

Wie aus Fig. 1 ersichtlich, ist das nach vorne hin an sich offene Rotorgehäuse 2 während des Spinnbetriebes durch ein schwenkbar gelagertes Deckelelement 8, in das eine (nicht näher dargestellte) Kanalplatte mit einer Dichtung 9 eingelassen ist, verschlossen.How out Fig. 1 As can be seen, the rotor housing 2, which is open to the front, is closed during the spinning operation by a pivotably mounted cover element 8 into which a channel plate (not shown in detail) with a seal 9 is embedded.

Das Rotorgehäuse 2 ist außerdem über eine entsprechende Unterdruckleitung 10 an eine Unterdruckquelle 11 angeschlossen, die den beim Spinnprozess im Rotorgehäuse 2 benötigten Spinnunterdruck erzeugt. Die Unterdruckleitung 10 bildet die Unterdruckversorgung der Offenend-Rotorspinneinrichtung 1. Die Unterdruckquelle 11 versorgt auch die übrigen Offenend-Rotorspinneinrichtungen der Offenend-Rotorspinnmaschine. Um die Unterdruckversorgung bei Bedarf abschalten zu können, weist die Unterdruckleitung 10 ein Ventil 31 auf.The rotor housing 2 is also connected via a corresponding vacuum line 10 to a vacuum source 11, which generates the spinning vacuum required in the rotor housing 2 during the spinning process. The vacuum line 10 forms the vacuum supply to the open-end rotor spinning device 1. The vacuum source 11 also supplies the remaining open-end rotor spinning devices of the open-end rotor spinning machine. In order to be able to switch off the vacuum supply when required, the vacuum line 10 has a valve 31.

Im Deckelelement 8 ist ein Ansatz 12 angeordnet, der das rotorseitige Ende 13 des Fadenabzugskanals 15 sowie den Mündungsbereich des Faserleitkanals 14 aufweist. Außerdem ist am Deckelelement 8, das um eine Schwenkachse 16 begrenzt drehbar gelagert ist, ein Auflösewalzengehäuse 17 festgelegt. Das Deckelelement 8 weist des Weiteren rückseitig Einzelantriebe 19, 20 für eine Auflösewalze 21 beziehungsweise einen Faserbandeinzugszylinder 22 auf.In the cover element 8, a projection 12 is arranged, which has the rotor-side end 13 of the thread take-off channel 15 and the opening area of the fiber guide channel 14. In addition, an opening roller housing 17 is fixed on the cover element 8, which is mounted so as to be rotatable to a limited extent about a pivot axis 16. The cover element 8 also has individual drives 19, 20 on the rear for an opening roller 21 or a sliver intake cylinder 22.

Zum Öffnen und Schließen des Deckelelementes 8 ist an der Offenend-Rotorspinneinrichtung 1 eine als Pneumatikzylinder ausgebildete Stellvorrichtung 32 vorhanden. Die Fig. 1 zeigt das Deckelelement in einer Schließstellung. Durch Ausfahren des Pneumatikzylinders 32 schwenkt das Deckelelement 8 um die Schwenkachse 16 von dem Rotorgehäuse 2 weg. Das Deckelement 8 kann so in eine Öffnungsstellung überführt werden. Für eine Öffnungsstellung zum Zwecke der vorliegenden Erfindung ist es nicht unbedingt erforderlich, dass der Spinnrotor ungehindert zugänglich. Es ist ausreichend, wenn die Umgebungsluft ungehindert eindringen kann. Das wird dadurch erreicht, dass die Dichtung 9 vollständig von dem Rotorgehäuse 2 beabstandet ist.To open and close the cover element 8, an adjusting device 32 designed as a pneumatic cylinder is provided on the open-end rotor spinning device 1. The Fig. 1 shows the cover element in a closed position. By extending the pneumatic cylinder 32, the cover element 8 pivots about the pivot axis 16 away from the rotor housing 2. The cover element 8 can thus be transferred into an open position. For an open position for the purpose of the present invention, it is not absolutely necessary that the spinning rotor is freely accessible. It is sufficient if the ambient air can penetrate unhindered. This is achieved in that the seal 9 is completely spaced from the rotor housing 2.

Der Offenend-Rotorspinneinrichtung 1 ist eine Steuereinrichtung 34 zugeordnet. Die Steuereinrichtung 34 steuert die Stellvorrichtung 32 und das Ventil 31 bei Bedarf an. In dem dargestellten Ausführungsbeispiel ist die Steuereinrichtung 34 außerdem zur Ansteuerung des elektromotorischen Einzelantriebes 33 ausgebildet. Die Steuereinrichtung 34 kann Verbindungen zu anderen Elementen der Arbeitsstelle oder der Offenend-Rotorspinnmaschine aufweisen.The open-end rotor spinning device 1 is assigned a control device 34. The control device 34 controls the actuating device 32 and the valve 31 if necessary. In the exemplary embodiment shown, the control device 34 is also designed to control the individual electromotive drive 33. The control device 34 can have connections to other elements of the work station or the open-end rotor spinning machine.

In Fig. 2 ist der Spinnrotor 3 und der in den Spinnrotor 3 ragende Ansatz 12 mit dem Fadenanzugskanal 15 nur schematisch dargestellt, um die Strömungsverhältnisse in dem Spinnrotor 3 zu verdeutlichen. Während des Spinnens wird dem Spinnrotor 3 über den in Fig. 2 nicht dargestellten Faserleitkanal 14 ein Faserband zugeführt. Die Fasern bilden in der Rotorrille 4 einen Faserring 5. Die in der Rotorrille 4 gesammelten Fasern werden laufend in das Fadenende eingebunden und der Faden durch den Fadenabzugskanal 15 abgezogen. Beim Stillsetzen der Offenend-Rotorspinneinrichtung, zum Beispiel nach einem Fadenbruch, verbleibt der Faserring 5 aufgrund der Fliehkräfte zunächst in der Rotorrille 4. Beim Bremsen des Spinnrotors 3 nehmen die Fliehkräfte mit abnehmender Drehzahl entsprechend ab. Bei geschlossenem Deckelelement 8 und wirksamer Unterdruckversorgung 10, das heißt, bei geöffnetem Ventil 31, wird Luft durch den Fadenabzugskanal 15 in das Rotorgehäuse 2 eingesaugt. Die Pfeile 40 deuten die daraus resultierende Luftströmung an. Wenn die Fliehkräfte den Faserring 5 nicht mehr in der Rotorrille 4 halten, bringt die Luftströmung 40 den Faserring 5 aus der Rotorrille 4 in den Bereich zwischen dem Ansatz 15 und den Seitenwänden 41 des Spinnrotors 3. In diesem Bereich befindet sich in Fig. 2 der Faserring 5'. Durch die Drehung des Spinnrotors 3 schrauben sich die Fasern um den Ansatz 12. So können sich die Fasern aus dem Inneren des Spinnrotors herausbewegen und können über den Spinnrotor 3 in den Bereich hinter der Rückwand 42 des Spinnrotors gelangen. Von da aus gelangen die Fasern in den Antrieb 33. Dies zu verhindern ist das Ziel der vorliegenden Erfindung.In Fig. 2 the spinning rotor 3 and the extension 12 protruding into the spinning rotor 3 with the thread take-up channel 15 are shown only schematically in order to illustrate the flow conditions in the spinning rotor 3. During spinning, the spinning rotor 3 via the in Fig. 2 Fiber guide channel 14, not shown, is supplied with a sliver. The fibers form a fiber ring 5 in the rotor groove 4. The fibers collected in the rotor groove 4 are continuously tied into the thread end and the thread through the thread take-off channel 15 deducted. When the open-end rotor spinning device is stopped, for example after a thread break, the fiber ring 5 initially remains in the rotor groove 4 due to the centrifugal forces. When the spinning rotor 3 is braked, the centrifugal forces decrease accordingly as the speed decreases. When the cover element 8 is closed and the vacuum supply 10 is active, that is to say when the valve 31 is open, air is sucked into the rotor housing 2 through the thread take-off channel 15. The arrows 40 indicate the air flow resulting therefrom. When the centrifugal forces no longer hold the fiber ring 5 in the rotor groove 4, the air flow 40 brings the fiber ring 5 out of the rotor groove 4 into the area between the extension 15 and the side walls 41 of the spinning rotor 3 Fig. 2 the fiber ring 5 '. As a result of the rotation of the spinning rotor 3, the fibers screw themselves around the attachment 12. The fibers can thus move out of the interior of the spinning rotor and can reach the area behind the rear wall 42 of the spinning rotor via the spinning rotor 3. From there, the fibers pass into the drive 33. The aim of the present invention is to prevent this.

Im Folgenden soll das erfindungsgemäße Verfahren noch einmal erläutert werden. Die Fig. 3 zeigt einen Verlauf der Drehzahl n beim Bremsen des Spinnrotors 3, aufgetragen über die Zeit t. Der Spinnrotor 3 dreht zunächst mit der Spinndrehzahl n0. Die Drehzahl n wird reduziert und passiert dabei die Drehzahl n1. Die Drehzahl n1 ist so festgelegt, dass die Fliehkräfte den Faserring 5 bei dieser Drehzahl noch sicher in der Rotorrille 5 halten. Oberhalb der Drehzahl n1 wird der Unterdruck in dem Rotorgehäuse aufgehoben. Dazu wird die Unterdruckversorgung 10 durch Schließen des Ventils 31 abgeschaltet. Die Ansteuerung des Ventils 31 erfolgt mittels der Steuereinrichtung 34. Bei der Drehzahl n2 ist der Faserring 5 aufgrund der nachlassenden Fliehkräfte bereits zusammengefallen. Die Fasern verbleiben im Inneren des Spinnrotors 3. Unterhalb der Drehzahl n2 können die Fasern des zusammengefallenen Faserrings 5 in der bereits beschriebenen Weise durch Verlagerung des Deckelelementes 8 abgesaugt werden. Auch hierzu erfolgt die Ansteuerung der Stellvorrichtung 32 und/ oder des Ventils 31 die Steuereinrichtung 34.The method according to the invention will be explained again below. The Fig. 3 shows a course of the speed n when braking the spinning rotor 3, plotted over time t. The spinning rotor 3 initially rotates at the spinning speed n 0 . The speed n is reduced and thereby passes the speed n 1 . The speed n 1 is set in such a way that the centrifugal forces still hold the fiber ring 5 securely in the rotor groove 5 at this speed. Above the speed n 1 , the negative pressure in the rotor housing is canceled. For this purpose, the vacuum supply 10 is switched off by closing the valve 31. The control of the valve 31 takes place by means of the control device 34. At the speed n 2 , the fiber ring 5 has already collapsed due to the decreasing centrifugal forces. The fibers remain inside the spinning rotor 3. Below the speed n 2 , the fibers of the collapsed fiber ring 5 can be sucked off in the manner already described by moving the cover element 8. The actuating device 32 and / or the valve 31 of the control device 34 are also activated for this purpose.

Die Drehzahlen n1 und n2 sind von verschiedenen Größen abhängig, insbesondere von dem Rotordurchmesser, aber auch von dem verarbeiteten Fasermaterial. Die Drehzahlen, bei denen der Unterdruck aufgehoben wird und die Fasern abgesaugt werden, können partiebezogen bestimmt werden und in der Steuereinrichtung 34 gespeichert sein.The speeds n 1 and n 2 are dependent on various variables, in particular on the rotor diameter, but also on the processed fiber material. The speeds, in which the negative pressure is removed and the fibers are sucked off, can be determined on a part-related basis and stored in the control device 34.

Claims (6)

  1. Method for operating an open-end rotor spinning device (1),
    wherein, for the purpose of spinning,
    a rotor housing (2) is closed by means of a cover element (8) and is subjected to a vacuum by means of a vacuum supply (10),
    a spinning rotor (3) rotates in the rotor housing (2), and
    an attachment (12), which is fastened to the cover element (8) and has a thread take-up duct (15), projects into the spinning rotor (3),
    and wherein, during braking of the spinning rotor (3),
    the speed of the spinning rotor (2) is reduced,
    the vacuum in the rotor housing (2) is cancelled above a first speed (n1), at which the centrifugal forces still hold a fibre ring (5) in the rotor groove (4) of the spinning rotor (3), and
    the fibre ring (5) is sucked up by displacement of the cover element (8) between an open position and a closed position below a second speed (n2), at which the fibre ring (5) has already collapsed due to the decreasing centrifugal forces, as a result of the vacuum restored in the rotor housing (2),
    characterised in that the vacuum is cancelled above the first speed (n1) by switching off the vacuum supply (10) of the open-end rotor spinning device (1), and in that the cover element (8) initially remains closed when the vacuum supply (10) is switched off.
  2. Method according to claim 1, characterised in that the cover element (8) is transferred from the open position to the closed position below the second speed (n2) while the vacuum supply (10) is active.
  3. Method according to claim 1, characterised in that the cover element (8) is transferred from the closed position to the open position below the second speed (n2) while the vacuum supply (10) is active.
  4. Open-end rotor spinning machine having a plurality of open-end rotor spinning devices (1) arranged side by side,
    the open-end rotor spinning devices (1) each comprising
    a rotor housing (2),
    a spinning rotor (3) arranged in the rotor housing (2),
    a cover element (8) for closing the rotor housing (2), which cover element (8) can be displaced between an open position and a closed position,
    a setting device (32) for displacing the cover element (8) between the open position and the closed position,
    an attachment (12), which is fastened to the cover element (8) and has a thread take-up duct (15) and projects into the spinning rotor (3) in the closed position, and
    a vacuum supply (10) for applying vacuum to the rotor housing (2),
    a control device (34) being designed to control one or more open-end rotor spinning devices (1) during braking of the spinning rotor (3) in such a way that the vacuum in the rotor housing (2) is cancelled above a first speed (n1), at which the centrifugal forces still hold a fibre ring (5) in the rotor groove (4) of the spinning rotor (3), and that the fibre ring (5) is sucked up by displacement of the cover element (8) between the open position and the closed position below a second speed (n2), at which the fibre ring (5) has already collapsed due to the decreasing centrifugal forces, as a result of the vacuum restored in the rotor housing (2),
    characterised in that
    a valve (31) for switching off the vacuum supply (10) is provided and the control device (34) is designed for closing the valve (31), in order to switch off the vacuum supply (10) above the first rotational speed (n1), and for initially keeping the cover element (8) closed when the vacuum supply (10) is switched off.
  5. Open-end rotor spinning machine according to claim 4, characterised in that the control device (34) is designed to control the setting device (32) in such a way that the cover element (8) is transferred from the open position to the closed position below the second speed (n2) while the vacuum supply (10) is active.
  6. Open-end rotor spinning machine according to claim 4, characterised in that the control device (34) is designed to control the setting device (32) in such a way that the cover element (8) is transferred from the closed position to the open position below the second speed (n2) while the vacuum supply (10) is active.
EP16200132.5A 2015-12-19 2016-11-23 Method for operating an open-ended rotor spinning device and open ended rotor spinning machine with a multitude of open-ended rotor spinning devices side by side Active EP3184679B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015016594.1A DE102015016594A1 (en) 2015-12-19 2015-12-19 A method of operating an open-end rotor spinning device and open-end rotor spinning machine having a plurality of juxtaposed open-end rotor spinning devices

Related Parent Applications (1)

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DE102015016594 Previously-Filed-Application 2015-12-19

Publications (2)

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EP3184679A1 EP3184679A1 (en) 2017-06-28
EP3184679B1 true EP3184679B1 (en) 2021-05-19

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EP16200132.5A Active EP3184679B1 (en) 2015-12-19 2016-11-23 Method for operating an open-ended rotor spinning device and open ended rotor spinning machine with a multitude of open-ended rotor spinning devices side by side

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EP (1) EP3184679B1 (en)
CN (1) CN106894122B (en)
DE (1) DE102015016594A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017118390A1 (en) * 2017-08-11 2019-02-14 Saurer Spinning Solutions Gmbh & Co. Kg Open-end spinning device
CN109161994A (en) * 2018-09-30 2019-01-08 苏州多道自动化科技有限公司 A kind of revolving cup automatically cleaning driving mechanism
WO2023057094A1 (en) 2021-10-06 2023-04-13 Saurer Spinning Solutions Gmbh & Co. Kg Spinning device, rotor spinning machine, and method for preventing the accumulation of fibres in a spinning device

Citations (4)

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EP0197442A2 (en) * 1985-04-02 1986-10-15 Schubert & Salzer Maschinenfabrik Aktiengesellschaft Open-end spinning machine
DE4244081C1 (en) * 1992-12-24 1994-01-13 Rieter Ingolstadt Spinnerei Open=ended spinner splicing - uses an auxiliary suction flow to draw yarn end through static spinning rotor into the fibre feed channel for precise positioning
DE19718768A1 (en) * 1997-05-05 1998-11-12 Rieter Ingolstadt Spinnerei Open end spinner cleaning
DE102006037849A1 (en) * 2005-08-12 2007-02-15 Rieter Ingolstadt Spinnereimaschinenbau Ag Control of start-up for open-end rotor spinning unit after cleaning includes reducing suction and rotor speed and collecting stray fibers in rotor groove

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Publication number Priority date Publication date Assignee Title
GB1191668A (en) * 1966-11-08 1970-05-13 Tmm Research Ltd Improvements relating to the Spinning of Textile Yarns
JPS5035140B1 (en) * 1970-10-05 1975-11-13
DE4131666C2 (en) * 1991-09-23 1996-02-29 Rieter Ingolstadt Spinnerei Method and device for cleaning an open-end spinning rotor
DE4131684A1 (en) * 1991-09-24 1993-03-25 Rieter Ingolstadt Spinnerei Open=end spinning rotor cleaning - has two phases for compressed air to loosen fibres and debris, and then blow them clear for suction extraction
DE19631234A1 (en) * 1996-08-02 1998-02-05 Rieter Ingolstadt Spinnerei Device for controlling an air flow in an open-end spinning device
DE19956264B4 (en) * 1999-11-23 2007-12-13 Rieter Ingolstadt Spinnereimaschinenbau Ag Method for cleaning an open-end spinning rotor
DE102004016547B4 (en) 2004-03-24 2013-08-22 Rieter Ingolstadt Gmbh Method for opening or cleaning a spinning machine
DE102004029020A1 (en) * 2004-06-16 2005-12-29 Saurer Gmbh & Co. Kg Method and apparatus for operating an open-end rotor spinning device
DE102005023517A1 (en) * 2005-05-21 2006-11-23 Saurer Gmbh & Co. Kg Rotor spinning unit for open-end spinning has rotor that can be retracted during an end break to open gap between rotor and fiber feed duct outlet
DE102013008107A1 (en) * 2013-05-11 2014-11-13 Saurer Germany Gmbh & Co. Kg Method for operating an open-end rotor spinning machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0197442A2 (en) * 1985-04-02 1986-10-15 Schubert & Salzer Maschinenfabrik Aktiengesellschaft Open-end spinning machine
DE4244081C1 (en) * 1992-12-24 1994-01-13 Rieter Ingolstadt Spinnerei Open=ended spinner splicing - uses an auxiliary suction flow to draw yarn end through static spinning rotor into the fibre feed channel for precise positioning
DE19718768A1 (en) * 1997-05-05 1998-11-12 Rieter Ingolstadt Spinnerei Open end spinner cleaning
DE102006037849A1 (en) * 2005-08-12 2007-02-15 Rieter Ingolstadt Spinnereimaschinenbau Ag Control of start-up for open-end rotor spinning unit after cleaning includes reducing suction and rotor speed and collecting stray fibers in rotor groove

Also Published As

Publication number Publication date
CN106894122B (en) 2022-05-24
DE102015016594A1 (en) 2017-06-22
EP3184679A1 (en) 2017-06-28
CN106894122A (en) 2017-06-27

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