EP2867392B1 - Method and device for controlling the fiber feed to a carding machine - Google Patents

Method and device for controlling the fiber feed to a carding machine Download PDF

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Publication number
EP2867392B1
EP2867392B1 EP13736631.6A EP13736631A EP2867392B1 EP 2867392 B1 EP2867392 B1 EP 2867392B1 EP 13736631 A EP13736631 A EP 13736631A EP 2867392 B1 EP2867392 B1 EP 2867392B1
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Prior art keywords
pressure
card
chute
weight
lower chute
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EP13736631.6A
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German (de)
French (fr)
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EP2867392A1 (en
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Christian Müller
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Maschinenfabrik Rieter AG
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Maschinenfabrik Rieter AG
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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
    • D01G23/00—Feeding fibres to machines; Conveying fibres between machines
    • D01G23/02—Hoppers; Delivery shoots
    • D01G23/04—Hoppers; Delivery shoots with means for controlling the feed
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G23/00—Feeding fibres to machines; Conveying fibres between machines
    • D01G23/06—Arrangements in which a machine or apparatus is regulated in response to changes in the volume or weight of fibres fed, e.g. piano motions

Definitions

  • the invention relates to a method and a device for controlling the fiber supply to a card.
  • Cards are used in spinning preparation and serve the dissolution of the fiber material in individual fibers and their parallelization and purification of impurities.
  • the carding machine produces a card sliver from the fiber material which is subsequently processed into a yarn. Instead of a card sliver, however, it is also possible to produce a nonwoven. Subsequently, a nonwoven produced with a carding machine is equivalent to a card sliver.
  • a card is usually associated with a hopper which is supplied by a conveyor system with fibers from the blow room. The fibers are transported in the form of fiber flakes. From the hopper, the fiber flakes are introduced in the form of a cotton wool in the card.
  • the uniformity of the wadding entering the carding machine plays an important role in terms of the service life of the carding elements and the carding quality requirements. Also, the uniformity of the tape or web produced by the card is affected by the uniformity of the wadding entering the card.
  • Another important technological factor in the carding process is the weight of the wadding entering the card. The size of the cotton weight and the entry speed of the cotton into the card essentially determine the production quantity of a card. The cotton weight influences the carding quality significantly.
  • the hopper is divided into an upper shaft and a lower shaft.
  • the upper shaft is filled with fiber flakes from a transport system continuously or demand-controlled. In most cases, pneumatic transport systems are used. From the upper shaft, the fiber flakes are brought with a feeding device in the lower shaft. If the filling shaft is now fed with fiber flakes via a pneumatic fluff feed, the fiber flakes move evenly from the upper shaft into the lower shaft thanks to the feed device, regardless of the uniformity of the delivery of flakes into the upper shaft. In this way, a decoupling takes place Systems of upper shaft and lower shaft. Uneven filling of the upper shaft as well as by the transport air caused pressure fluctuations in the upper shaft can have a small but disturbing influence on the conditions in the lower shaft.
  • a homogenous wadding pattern is created, which is suitable for the feeding of the card.
  • Modern, two-part filling shafts very often also contain an opening roller in addition to the aforementioned feed device. This opening roller is immediately downstream of the feed device of the hopper, whereby the fiber flakes are additionally opened and homogenized.
  • a fan is provided which allows an increase in pressure in the lower shaft.
  • a disadvantage of the device is that the pressure setpoint is adjusted due to the predetermined level.
  • a change in the size of the batting weight, so the compression is possible in this case only by changing the level or by changing the amount and pressure of the incoming air.
  • a change in the degree of dissolution causes a change in the weight of the cotton, the degree of dissolution is usually dictated by technological requirements.
  • the object of the invention is therefore to provide a method for controlling the fiber supply to a card, which allows a direct control of the cotton weight, regardless of the resolution of the fiber flakes and independent of the product column in the lower shaft.
  • the hopper is divided into an upper shaft and a lower shaft.
  • fiber flakes are fed.
  • the fiber flakes are transported with a feed device in the lower shaft.
  • air is fed via a fan, which leads to an increase in pressure over the fiber flakes.
  • the injected air is removed via an air-permeable wall from the lower shaft and fed back to the fan. Since such air circulation can not be lossless, the fan corresponding air supply openings are provided.
  • the fiber flakes are compacted in the lower shaft under a certain pressure to a cotton wool with a certain cotton weight. The pressure is regulated by the feed device.
  • a lower level is reached in the lower shaft, which results in covering parts of the air-permeable wall, which in turn results in an increase in the pressure in the lower shaft.
  • It is specified a desired value for the cotton weight which is assigned a target pressure for the lower shaft.
  • the cotton wool reference is determined based on the processual experience of processing a particular fiber in relation to the amount of production intended.
  • this setpoint for the cotton weight of the machine control is entered via an input device.
  • the machine control assigns a corresponding desired value for the pressure to the entered desired value for the cotton weight.
  • corresponding values for the pressure in the lower shaft are stored in the machine control or are calculated by appropriate algorithms.
  • the algorithms used are usually based on empirical values, which depend on the machine design and the product to be processed.
  • the pressure in the lower shaft is now regulated by the setpoint via the feed device. If the setpoint for the pressure is undershot, there is an increase in the feeding of fiber flakes into the lower shaft and vice versa. If the pressure control has reached a certain stability, an actual value for the Wötewith is determined.
  • the determination of the actual value of the cotton weight is carried out by a calculation of the weight of the produced card sliver or fleece, a total delay of the card and a separated leaving quantity. Due to a subsequent desired-actual-value comparison of the cotton weight, a correction of the desired value for the pressure in the lower shaft is made.
  • the pressure in the lower shaft can be influenced by a regulation of the fan.
  • the regulation of the pressure in the lower shaft on the basis of the specified value is additionally carried out with the aid of the fan.
  • the pressure generated in the lower shaft is influenced.
  • the actual regulation of the pressure has to be done in this case in a combination of the regulations of the supply and the fan.
  • a further adjusting means for example in the form of a valve or slide, which are discharged from the lower shaft and recirculated to the fan circulating air can be used to influence the pressure in the lower shaft.
  • the wadding entering the card is subsequently opened by the card, cleaned and dissolved in individual fibers.
  • the individual fibers are parallelized and leave the card in the form of a fleece or card sliver.
  • the cotton wool is pulled apart so that the produced card sliver leaves the carding machine at a higher exit speed than the entry speed of the cotton wool into the carding machine.
  • This process is called delay.
  • Such a delay occurs over several arranged in the carding rollers.
  • the occurring individual delays from roller to roller can be added together in a so-called total delay of the card. Due to the operating state of a card whose total delay is known and is determined by the machine control itself.
  • the total delay of a card corresponds to the ratio of the discharge speed of the card sliver or nonwoven to the inlet speed of the cotton, which in turn correspond to the ratio of the peripheral speeds of the feed roller and outlet roller.
  • the machine control system determines the speed of the motors from the output values output to the corresponding motors and, correspondingly, the peripheral speeds of the rollers driven by the motors.
  • Other means for determining the inlet velocity or the outlet velocity are, for example, speed measurements of the rollers or shafts.
  • the output quantity can be determined via an outgoing function depending on the production quantity. The determination of the outgoing function is usually carried out for a machine type and a fiber product to be processed once by empirically measuring the amount of waste at different production ratios and different fiber material.
  • the measurement of the strip weight at the card outlet is known from the prior art and takes place, for example, via the measurement of a disc roller spacing.
  • the belt is guided between two disk rollers, wherein the axial distance of the disk rollers is variable and is determined by the thickness of the belt. This can be due to the center distance of the disc rollers close to the weight of the band.
  • Further known measuring methods are microwave measurement, capacitive measurement, tactile finger measurement or step roller measurement for the measurement of a strip or radiometric measuring systems for the measurement of a nonwoven.
  • the controller has an input means for inputting a target value for the cotton weight.
  • input means keyboards, touch screens, preselection buttons or similar means may be provided.
  • the control is connected to measuring means for determining an actual value for the cotton weight.
  • the measuring means for determining the actual value for the cotton weight preferably comprise measuring means for measuring a strip weight at the card discharge and means for determining an entry speed and an exit speed of the card.
  • adjusting means are provided for influencing the pressure in the lower shaft, which serve to regulate the pressure in the lower shaft.
  • the adjusting means for influencing the pressure is a feeding device, which is arranged between the upper shaft and the lower shaft.
  • the feed device comprises a feed trough and a feed roll. To change the supply, the speed of the feed roller is changed. This changes the flow of flock from the upper shaft into the lower shaft.
  • a suction is provided at certain points to eliminate trash.
  • the circulating air that flows through the air-permeable wall transports small amounts of impurities, known as trash, from the lower shaft into the air duct. Due to the construction of the air ducts and the resulting currents, this trash settles in the duct system.
  • a suction is provided. This extraction again influences the pressure in the lower shaft and has to be considered accordingly in the machine control for the control of the cotton weight.
  • the FIG. 1 Fibrous flakes 18 pass through the various process stages of the cleaning shop in the upper shaft 1 of the hopper 9.
  • the fiber flakes 18 are through the feed device 19, comprising a feed trough 2 and a feed roller 3, passed on to an opening roller 4, which further opens the fiber flakes 18.
  • the opening roller 4 releases the further opened fiber flakes 18 into the lower shaft 5.
  • the presence of such an opening roller 4 is not necessary for the control of the cotton weight, but has by the refined resolution of the fiber flakes influence on the compression of the fiber flakes at the same pressure in the lower shaft 5.
  • a pressure sensor 20 is provided for measuring the currently prevailing pressure
  • a blowing device 6 is provided for the further compression of the cotton.
  • the air blown in by the blowing device 6 flows through the fiber flakes.
  • This air flow 7 leaves the shaft 5 through the air-permeable region 8 of the wall of the lower shaft 5 and is returned to the injection device 6.
  • a fan is suitable. The fan guides the air in a circle.
  • the pressure generated by the fan in the lower shaft is dependent on the air permeability of the fiber flakes and the open cross section of the wall 8 of the lower shaft 5. With the help of the suction 21 is removed from the channel system of the depositing Trash.
  • a second feed device 10 finally feeds the fiber flakes, now in the form of a homogeneous wadding 11, via a feed line to the licker-in module 12 of the card.
  • the Watteneinvier takes place with an inlet velocity v1.
  • the lickerins 12 further open the fiber flakes of the wadding pad 11 and at the same time remove some of the contaminants.
  • the last licker-in roller finally transfers the fibers to the card drum 13, which completely dissolves and parallelises the fibers.
  • the carding drum 13 cooperates with the cover unit 14.
  • a disk roller pair 17 for measuring the weight of the belt is arranged schematically.
  • FIG. 2 shows a schematic representation of the regulation of the cotton weight.
  • an input device 40 Via an input device 40, the input of the desired value for the batten weight.
  • the setpoint is forwarded to the controller 52 for assignment 41 of the setpoint for the pressure in the lower shaft and the cotton weight control 41.
  • the assigned setpoint for the pressure in the lower shaft is fed to the pressure control 42.
  • the pressure control 42 is connected to a pressure sensor 20 in the lower shaft, by means of which the actual value of the pressure in the lower shaft is determined. By comparing the setpoint for the pressure with the actual value of the pressure, a correction is calculated by the pressure control 42 and a corresponding signal to the adjusting means for changing the pressure in the lower shaft, for example, to the feeder 19, output.
  • the entry speed v1 of the lap and the exit speed v2 of the card sliver are fed to the calculation 45 of the decay of the card.
  • the calculated total delay of the card is forwarded to the unit 48 for calculating the actual value of the cotton weight.
  • the value for the band weight 47 and the quantity 46 are added in the calculation step 48.
  • the actual value of the cotton weight determined therefrom is forwarded to the cotton weight control 49.
  • a correction 51 of the desired value for the pressure in the lower shaft is calculated by the comparison of the target value for the cotton weight with the actual value of the cotton weight and output by the cotton weight control 49.
  • the pressure control 42 will react accordingly. As soon as a stable operating state of the pressure control 42 is reached, the cotton weight control 49 is reactivated and the process is repeated.

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Regelung der Faserzufuhr zu einer Karde.The invention relates to a method and a device for controlling the fiber supply to a card.

Karden finden Anwendung in der Spinnereivorbereitung und dienen der Auflösung des Fasergutes in Einzelfasern sowie deren Parallelisierung und Reinigung von Verunreinigungen. Die Karde produziert aus dem eingespeisten Fasergut ein Kardenband, welches in der Folge zu einem Garn weiter verarbeitet wird. Anstelle eines Kardenbandes kann jedoch auch ein Vlies hergestellt werden. Nachfolgend ist ein mit einer Karde hergestelltes Vlies einem Kardenband gleichzusetzen. Dabei ist einer Karde in der Regel ein Füllschacht zugeordnet welcher durch ein Fördersystem mit Fasern aus der Putzerei versorgt wird. Die Fasern werden dabei in Form von Faserflocken transportiert. Aus dem Füllschacht werden die Faserflocken in Form einer Watte in die Karde eingebracht. Dabei spielt die Gleichmässigkeit der in die Karde einlaufenden Watte eine wichtige Rolle bezüglich der Lebensdauer der Arbeitselemente der Karde und den Anforderungen an die Kardierqualität. Auch wird die Gleichmässigkeit des durch die Karde produzierten Bandes oder Vlieses durch die Gleichmässigkeit der in die Karde einlaufenden Watte beeinflusst. Eine ebenfalls wichtige technologische Grösse im Kardierprozess ist das Gewicht der in die Karde einlaufenden Watte. Die Grösse des Wattegewichts und die Einlaufgeschwindigkeit der Watte in die Karde bestimmen im wesentlichen die Produktionsmenge einer Karde. Das Wattegewicht beeinflusst die Kardierqualität wesentlich.Cards are used in spinning preparation and serve the dissolution of the fiber material in individual fibers and their parallelization and purification of impurities. The carding machine produces a card sliver from the fiber material which is subsequently processed into a yarn. Instead of a card sliver, however, it is also possible to produce a nonwoven. Subsequently, a nonwoven produced with a carding machine is equivalent to a card sliver. In this case, a card is usually associated with a hopper which is supplied by a conveyor system with fibers from the blow room. The fibers are transported in the form of fiber flakes. From the hopper, the fiber flakes are introduced in the form of a cotton wool in the card. The uniformity of the wadding entering the carding machine plays an important role in terms of the service life of the carding elements and the carding quality requirements. Also, the uniformity of the tape or web produced by the card is affected by the uniformity of the wadding entering the card. Another important technological factor in the carding process is the weight of the wadding entering the card. The size of the cotton weight and the entry speed of the cotton into the card essentially determine the production quantity of a card. The cotton weight influences the carding quality significantly.

Der Füllschacht ist in einen Oberschacht und einen Unterschacht unterteilt. Der Oberschacht wird mit Faserflocken aus einem Transportsystem kontinuierlich oder bedarfsgesteuert befüllt. Zumeist kommen pneumatische Transportsysteme zum Einsatz. Aus dem Oberschacht werden die Faserflocken mit einer Speisevorrichtung in den Unterschacht gebracht. Wird der Füllschacht nun über eine pneumatische Flockenzufuhr mit Faserflocken beschickt, bewegen sich die Faserflocken dank der Speisevorrichtung gleichmässig vom Oberschacht in den Unterschacht, unabhängig von der Gleichmässigkeit der Flockenlieferung in den Oberschacht. Auf diese Weise erfolgt eine Entkopplung der Systeme des Oberschachtes und des Unterschachtes. Ungleichmässige Befüllungen des Oberschachtes wie auch durch die Transportluft verursachte Druckschwankungen im Oberschacht können einen geringen jedoch störenden Einfluss auf die Verhältnisse im Unterschacht haben. Im unteren Teil des Füllschachtes, im Unterschacht, entsteht eine homogene Wattenvorlage, welche für die Speisung der Karde geeignet ist. Moderne, zweiteilige Füllschächte enthalten heutzutage zusätzlich zur genannten Speisevorrichtung sehr oft auch eine Auflösewalze. Diese Auflösewalze wird der Speisevorrichtung des Füllschachtes unmittelbar nachgeordnet, wodurch die Faserflocken zusätzlich geöffnet und homogenisiert werden. Ebenfalls ist zugehörig zum Unterschacht ein Ventilator vorgesehen, welcher eine Druckerhöhung im Unterschacht ermöglicht.The hopper is divided into an upper shaft and a lower shaft. The upper shaft is filled with fiber flakes from a transport system continuously or demand-controlled. In most cases, pneumatic transport systems are used. From the upper shaft, the fiber flakes are brought with a feeding device in the lower shaft. If the filling shaft is now fed with fiber flakes via a pneumatic fluff feed, the fiber flakes move evenly from the upper shaft into the lower shaft thanks to the feed device, regardless of the uniformity of the delivery of flakes into the upper shaft. In this way, a decoupling takes place Systems of upper shaft and lower shaft. Uneven filling of the upper shaft as well as by the transport air caused pressure fluctuations in the upper shaft can have a small but disturbing influence on the conditions in the lower shaft. In the lower part of the hopper, in the lower shaft, a homogenous wadding pattern is created, which is suitable for the feeding of the card. Modern, two-part filling shafts very often also contain an opening roller in addition to the aforementioned feed device. This opening roller is immediately downstream of the feed device of the hopper, whereby the fiber flakes are additionally opened and homogenized. Also belonging to the lower shaft, a fan is provided which allows an increase in pressure in the lower shaft.

Durch das Gewicht der Faserflocken im Unterschacht und durch den mit dem Ventilator herbeigeführten Druck im Unterschacht werden die Faserflocken zu einer Watte verdichtet. Die durch den Ventilator in den Unterschacht einströmende Luft wird über eine luftdurchlässige Wand aus dem Unterschacht abgezogen. Aus dem Stand der Technik ist es bekannt, die Gleichmässigkeit der Watte durch eine Steuerung des Drucks im Unterschacht zu regeln. Dadurch wird eine gleichmässige Verdichtung erreicht. Eine derartige Regelung offenbart beispielsweise die CH 673 292 A5 . Dabei ist im Unterschacht ein Druckaufnehmer vorgesehen, welcher über einen Druckregler mit einem regelbaren Antrieb der Einzugswalze der Speiseeinrichtung in Verbindung steht. Der Sollwert für den Druck wird über eine Füllstandsmessung im Unterschacht ermittelt. Dadurch wird es ermöglicht in Verbindung mit einer Leistungserhöhung der Maschine eine automatische Einstellung des Drucksollwertes zu realisieren. Nachteilig an der Vorrichtung ist, dass der Drucksollwert aufgrund des vorgegebenen Füllstandes eingestellt wird. Der Füllstand im Unterschacht, die vorgelegte Putzereilinie, der Volumenstrom der eingeblasenen Luft, der Auflösegrad, welcher durch die Auflösewalze bewirkt wird, und andere Materialeigenschaften bestimmen hauptsächlich die Verdichtung der Faserflocken. Eine Änderung der Grösse des Wattengewichts, also der Verdichtung, ist in diesem Falle nur durch eine Änderung des Füllstandes oder durch Änderung von Menge und Druck der einströmenden Luft möglich. Auch eine Änderung des Auflösegrades bewirkt eine Änderung des Wattengewichts, wobei der Auflösegrad meist durch technologische Anforderungen vorgegeben ist.Due to the weight of the fiber flakes in the lower shaft and the pressure caused by the fan in the lower shaft, the fiber flakes are compacted into a cotton wool. The air flowing into the lower shaft through the fan is extracted from the lower shaft via an air-permeable wall. From the prior art it is known to regulate the uniformity of the cotton by controlling the pressure in the lower shaft. As a result, a uniform compression is achieved. Such a scheme discloses, for example, the CH 673 292 A5 , In this case, a pressure transducer is provided in the lower shaft, which is connected via a pressure regulator with a controllable drive of the feed roller of the feeder in combination. The setpoint for the pressure is determined via a level measurement in the lower shaft. This makes it possible, in conjunction with a power increase of the machine, to realize an automatic setting of the pressure setpoint. A disadvantage of the device is that the pressure setpoint is adjusted due to the predetermined level. The level in the lower well, the presented clean-up line, the volume flow of the injected air, the degree of dissolution, which is caused by the opening roller, and other material properties mainly determine the compaction of the fiber flakes. A change in the size of the batting weight, so the compression is possible in this case only by changing the level or by changing the amount and pressure of the incoming air. A change in the degree of dissolution causes a change in the weight of the cotton, the degree of dissolution is usually dictated by technological requirements.

Weiter offenbart die DE 26 58 044 A1 ein Verfahren respektive eine zugehörige Vorrichtung zur zum Erzeugen eines gleichmässigen, kontinuierlichen Faserbandes, bei dem die Flockensäule in einem Flockenschacht in Abhängigkeit von einer Abweichung gemessen wird, die an einem von dem Flockenschacht abgelieferten Faserband im Durchlauf gemessen wird. Dabei wird eine Regelung des Druckes im Unterschacht durch eine Überlagerung mit einer Faserband-Regelung vorgeschlagen. Nachteilig dabei ist, dass versucht wird Schwankungen im Faserband auszugleichen ohne den Verarbeitungsprozess der Watte vom Unterschacht zum Faserband miteinzubeziehen.Next discloses the DE 26 58 044 A1 a method and associated apparatus for producing a uniform, continuous sliver in which the flake column is measured in a flute chute in response to a deviation measured on a sliver delivered by the slotted well in the pass. In this case, a regulation of the pressure in the lower shaft is proposed by a superposition with a sliver control. The disadvantage here is that attempts are made to compensate for fluctuations in the sliver without the processing of cotton wool from the lower shaft to the sliver include.

Die Aufgabe der Erfindung ist es demnach ein Verfahren zur Regelung der Faserzufuhr zu einer Karde zu schaffen, welches eine direkte Regelung des Wattegewichtes ermöglicht, unabhängig von der Auflösung der Faserflocken und unabhängig von der Produktsäule im Unterschacht.The object of the invention is therefore to provide a method for controlling the fiber supply to a card, which allows a direct control of the cotton weight, regardless of the resolution of the fiber flakes and independent of the product column in the lower shaft.

Die Aufgabe wird gelöst durch die Merkmale im kennzeichnenden Teil des unabhängigen Anspruchs.The object is solved by the features in the characterizing part of the independent claim.

Zur Lösung der Aufgabe werden ein neuartiges Verfahren und die zugehörige Vorrichtung zur Regelung der Faserzufuhr zu einer Karde mit einem Füllschacht vorgeschlagen. Der Füllschacht ist in einen Oberschacht und einen Unterschacht unterteilt. In den Oberschacht werden Faserflocken eingespeist. Die Faserflocken werden mit einer Speisevorrichtung in den Unterschacht transportiert. Im Unterschacht wird über einen Ventilator Luft eingespeist, welche zu einer Druckerhöhung über den Faserflocken führt. Die eingespeiste Luft wird über eine luftdurchlässige Wand aus dem Unterschacht abgeführt und dem Ventilator wieder zugeführt. Da eine derartige Luftumwälzung nicht verlustfrei erfolgen kann, sind beim Ventilator entsprechende Luftzuführungsöffnungen vorgesehen. Die Faserflocken werden im Unterschacht unter einem bestimmten Druck zu einer Watte mit einem bestimmten Wattegewicht verdichtet. Der Druck wird über die Speisevorrichtung geregelt. Durch die Erhöhung der Speisung wird im Unterschacht ein höherer Füllstand erreicht, was dazu führt, dass Teile der luftdurchlässigen Wand abgedeckt werden, was wiederum einen Anstieg des Druckes im Unterschacht zur Folge hat. Es wird ein Sollwert für das Wattegewicht vorgegeben, welchem ein Solldruck für den Unterschacht zugeordnet wird. Der Sollwert für das Wattegewicht wird aufgrund der prozessualen Erfahrung mit der Verarbeitung eines bestimmten Fasergutes in Verbindung mit der Höhe der vorgesehenen Produktion bestimmt. Durch das Bedienpersonal wird dieser Sollwert für das Wattegewicht der Maschinensteuerung über ein Eingabegerät eingegeben. Durch die Maschinensteuerung wird dem eingegebenen Sollwert für das Wattegewicht ein entsprechender Sollwert für den Druck zugeordnet. Für verschiedene Wattegewichte sind in der Maschinensteuerung entsprechende Werte für den Druck im Unterschacht hinterlegt oder werden durch entsprechende Algorithmen berechnet. Die zur Anwendung kommenden Algorithmen basieren in der Regel auf Erfahrungswerten, welche von der Maschinenausführung und dem zu verarbeitenden Produkt abhängig sind. Der Druck im Unterschacht wird nun anhand des Sollwertes über die Speisevorrichtung geregelt. Wird der Sollwert für den Druck unterschritten erfolgt eine Erhöhung der Speisung von Faserflocken in den Unterschacht und umgekehrt. Hat die Druckregelung eine bestimmte Stabilität erreicht, wird ein Istwert für das Wättegewicht ermittelt. Die Ermittlung des Istwertes des Wattegewichtes erfolgt durch eine Berechnung aus dem Gewicht des hergestellten Kardenbandes oder Vlieses, einem Totalverzug der Karde und einer abgeschiedenen Abgangsmenge. Aufgrund eines anschliessenden Soll-Ist-Wert-Vergleichs des Wattegewichtes wird eine Korrektur des Sollwertes für den Druck im Unterschacht vorgenommen.To solve the problem, a novel method and the associated device for controlling the fiber supply to a card with a hopper are proposed. The hopper is divided into an upper shaft and a lower shaft. In the upper shaft fiber flakes are fed. The fiber flakes are transported with a feed device in the lower shaft. In the lower shaft air is fed via a fan, which leads to an increase in pressure over the fiber flakes. The injected air is removed via an air-permeable wall from the lower shaft and fed back to the fan. Since such air circulation can not be lossless, the fan corresponding air supply openings are provided. The fiber flakes are compacted in the lower shaft under a certain pressure to a cotton wool with a certain cotton weight. The pressure is regulated by the feed device. By increasing the supply, a lower level is reached in the lower shaft, which results in covering parts of the air-permeable wall, which in turn results in an increase in the pressure in the lower shaft. It is specified a desired value for the cotton weight, which is assigned a target pressure for the lower shaft. The cotton wool reference is determined based on the processual experience of processing a particular fiber in relation to the amount of production intended. By the operator, this setpoint for the cotton weight of the machine control is entered via an input device. The machine control assigns a corresponding desired value for the pressure to the entered desired value for the cotton weight. For various cotton weights, corresponding values for the pressure in the lower shaft are stored in the machine control or are calculated by appropriate algorithms. The algorithms used are usually based on empirical values, which depend on the machine design and the product to be processed. The pressure in the lower shaft is now regulated by the setpoint via the feed device. If the setpoint for the pressure is undershot, there is an increase in the feeding of fiber flakes into the lower shaft and vice versa. If the pressure control has reached a certain stability, an actual value for the Wättegewicht is determined. The determination of the actual value of the cotton weight is carried out by a calculation of the weight of the produced card sliver or fleece, a total delay of the card and a separated leaving quantity. Due to a subsequent desired-actual-value comparison of the cotton weight, a correction of the desired value for the pressure in the lower shaft is made.

In einer weiteren Ausführungsform kann der Druck im Unterschacht durch eine Regelung des Ventilators beeinflusst werden. Die Regelung des Druckes im Unterschacht anhand des vorgegebenen Sollwertes erfolgt zusätzlich mit Hilfe des Ventilators. Durch die Regelung der Drehzahl des Ventilators wird der erzeugte Druck im Unterschacht beeinflusst. Die eigentliche Regelung des Druckes hat in diesem Falle in einer Kombination der Regelungen der Speisung und des Ventilators zu erfolgen. Auch kann über ein weiteres Stellmittel, beispielsweise in Form eines Ventils oder Schiebers, die aus dem Unterschacht abfliessende und zum Ventilator zurückgeführte Umluft dazu genutzt werden den Druck im Unterschacht zu beeinflussen.In a further embodiment, the pressure in the lower shaft can be influenced by a regulation of the fan. The regulation of the pressure in the lower shaft on the basis of the specified value is additionally carried out with the aid of the fan. By controlling the speed of the fan, the pressure generated in the lower shaft is influenced. The actual regulation of the pressure has to be done in this case in a combination of the regulations of the supply and the fan. Also, via a further adjusting means, for example in the form of a valve or slide, which are discharged from the lower shaft and recirculated to the fan circulating air can be used to influence the pressure in the lower shaft.

Die in die Karde einlaufende Watte wird in der Folge durch die Karde geöffnet, gereinigt und in Einzelfasern aufgelöst. Die einzelnen Fasern werden parallelisiert und verlassen die Karde in Form eines Vlieses oder Kardenbandes. In diesem Prozess wird die Watte auseinandergezogen, sodass das hergestellte Kardenband mit einer höheren Auslaufgeschwindigkeit die Karde verlässt als die Einlaufgeschwindigkeit der Watte in die Karde. Diesen Vorgang nennt man Verzug. Ein derartiger Verzug geschieht über mehrere in der Karde angeordnete Walzen. Die dabei auftretenden einzelnen Verzüge von Walze zu Walze können in einem sogenannten Totalverzug der Karde zusammengerechnet werden. Aufgrund des Betriebszustandes einer Karde ist deren Totalverzug bekannt und wird durch die Maschinensteuerung selbst ermittelt. Der Totalverzug einer Karde entspricht dem Verhältnis von der Auslaufgeschwindigkeit des Kardenbandes oder Vlieses zur Einlaufgeschwindigkeit der Watte, welche wiederum dem Verhältnis der Umfangsgeschwindigkeiten von Speisewalze und Auslaufwalze entsprechen. Über die Ansteuerung der Antriebe im Einlauf und Auslauf der Karde ermittelt die Maschinensteuerung aus den, an die entsprechenden Motoren, ausgegebenen Stellwerten die Drehzahl der Motoren und entsprechend die Umfangsgeschwindigkeiten der durch die Motoren angetriebenen Walzen. Andere Mittel zu Bestimmung der Einlaufgeschwindigkeit oder der Auslaufgeschwindigkeit sind beispielsweise Drehzahlmessungen der Walzen oder Wellen.The wadding entering the card is subsequently opened by the card, cleaned and dissolved in individual fibers. The individual fibers are parallelized and leave the card in the form of a fleece or card sliver. In this process, the cotton wool is pulled apart so that the produced card sliver leaves the carding machine at a higher exit speed than the entry speed of the cotton wool into the carding machine. This process is called delay. Such a delay occurs over several arranged in the carding rollers. The occurring individual delays from roller to roller can be added together in a so-called total delay of the card. Due to the operating state of a card whose total delay is known and is determined by the machine control itself. The total delay of a card corresponds to the ratio of the discharge speed of the card sliver or nonwoven to the inlet speed of the cotton, which in turn correspond to the ratio of the peripheral speeds of the feed roller and outlet roller. By controlling the drives in the infeed and outfeed of the card, the machine control system determines the speed of the motors from the output values output to the corresponding motors and, correspondingly, the peripheral speeds of the rollers driven by the motors. Other means for determining the inlet velocity or the outlet velocity are, for example, speed measurements of the rollers or shafts.

Durch die Reinigung und Parallelisierung des Fasergutes werden in der Karde aus dem Fasergut Verunreinigungen und Kurzfasern ausgeschieden. Die dem Fasergut entnommenen Bestandeile werden zusammenfassend als Abgang bezeichnet. Die Abgangsmenge kann über eine Abgangsfunktion in Abhängigkeit der Produktionsmenge bestimmt werden. Die Ermittlung der Abgangsfunktion erfolgt in der Regel für einen Maschinentyp und ein zu verarbeitendes Fasergut einmal durch ein empirisches Messen der Abgangsmenge bei verschiedenen Produktionsverhältnissen und unterschiedlichem Fasergut.By cleaning and parallelization of the fiber material impurities and short fibers are excreted in the card from the fiber. The components taken from the fiber material are collectively referred to as the departure. The output quantity can be determined via an outgoing function depending on the production quantity. The determination of the outgoing function is usually carried out for a machine type and a fiber product to be processed once by empirically measuring the amount of waste at different production ratios and different fiber material.

Die Messung des Bandgewichts am Kardenauslauf ist aus dem Stand der Technik bekannt und erfolgt beispielsweise über die Messung eines Scheibenwalzenabstands. Dabei wird das Band zwischen zwei Scheibenwalzen hindurch geführt, wobei der Achsabstand der Scheibenwalzen veränderbar ist und durch die Dicke des Bandes bestimmt wird. Damit lässt sich aufgrund des Achsabstandes der Scheibenwalzen auf das Gewicht des Bandes schliessen. Weitere bekannte Messverfahren sind Mikrowellenmessung, Kapazitive Messung, Tastfingermessung oder Stufenwalzenmessung für die Messung eines Bandes oder radiometrische Messsysteme für die Messung eines Vlieses.The measurement of the strip weight at the card outlet is known from the prior art and takes place, for example, via the measurement of a disc roller spacing. In this case, the belt is guided between two disk rollers, wherein the axial distance of the disk rollers is variable and is determined by the thickness of the belt. This can be due to the center distance of the disc rollers close to the weight of the band. Further known measuring methods are microwave measurement, capacitive measurement, tactile finger measurement or step roller measurement for the measurement of a strip or radiometric measuring systems for the measurement of a nonwoven.

Zur Regelung des Wattegewichtes ist eine Steuerung vorgesehen, diese ist vorteilhafterweise in der Maschinensteuerung integriert. Die Steuerung weist ein Eingabemittel zur Eingabe eines Sollwertes für das Wattegewicht auf. Als Eingabemittel können Tastaturen, Touchscreens, Vorwahltasten oder ähnliche Mittel vorgesehen sein. Die Steuerung ist mit Messmitteln zur Ermittlung eines Istwertes für das Wattegewicht verbunden. Die Messmittel zur Ermittlung des Istwertes für das Wattegewicht umfassen bevorzugterweise Messmittel zur Messung eines Bandgewichtes am Kardenauslauf und Mittel zu Bestimmung einer Einlaufgeschwindigkeit und einer Auslaufgeschwindigkeit der Karde.To control the cotton weight control is provided, this is advantageously integrated in the machine control. The controller has an input means for inputting a target value for the cotton weight. As input means keyboards, touch screens, preselection buttons or similar means may be provided. The control is connected to measuring means for determining an actual value for the cotton weight. The measuring means for determining the actual value for the cotton weight preferably comprise measuring means for measuring a strip weight at the card discharge and means for determining an entry speed and an exit speed of the card.

Ebenfalls sind Stellmittel zur Beeinflussung des Druckes im Unterschacht vorgesehen, welche zur Regelung des Drucks im Unterschacht dienen. Bevorzugterweise ist das Stellmittel zur Beeinflussung des Druckes eine Speisevorrichtung, welche zwischen dem Oberschacht und dem Unterschacht angeordnet ist. Die Speisevorrichtung umfasst eine Speisemulde und eine Speisewalze. Zur Veränderung der Speisung wird die Drehzahl der Speisewalze verändert. Dadurch verändert sich der Flockenstrom vom Oberschacht in den Unterschacht.Also, adjusting means are provided for influencing the pressure in the lower shaft, which serve to regulate the pressure in the lower shaft. Preferably, the adjusting means for influencing the pressure is a feeding device, which is arranged between the upper shaft and the lower shaft. The feed device comprises a feed trough and a feed roll. To change the supply, the speed of the feed roller is changed. This changes the flow of flock from the upper shaft into the lower shaft.

In einer weiteren Ausführungsform ist es denkbar, dass zur Beseitigung von Trash an bestimmten Stellen eine Absaugung vorgesehen ist. Die Umluft, welche durch die luftdurchlässige Wand strömt transportiert geringe Mengen von Verunreinigungen, sogenannten Trash aus dem Unterschacht in den Luftkanal. Bedingt durch die Konstruktion der Luftkanäle und die dadurch hervorgerufenen Strömungen setzt sich dieser Trash im Kanalsystem ab. Um eine periodische Reinigung der Luftkanäle von Hand zu vermeiden ist eine Absaugung vorgesehen. Diese Absaugung beeinflusst nun wiederum den Druck im Unterschacht und ist in der Maschinensteuerung für die Regelung des Wattegewichtes entsprechend zu berücksichtigen.In a further embodiment, it is conceivable that a suction is provided at certain points to eliminate trash. The circulating air that flows through the air-permeable wall transports small amounts of impurities, known as trash, from the lower shaft into the air duct. Due to the construction of the air ducts and the resulting currents, this trash settles in the duct system. In order to avoid a periodic cleaning of the air ducts by hand, a suction is provided. This extraction again influences the pressure in the lower shaft and has to be considered accordingly in the machine control for the control of the cotton weight.

Im Folgenden wird die Erfindung anhand von einer beispielhaften Ausführungsform erklärt und durch Zeichnungen näher erläutert.

  • Fig. 1 Schematische Darstellung einer Karde mit Füllschacht
  • Fig. 2 Schematische Darstellung der Regelung des Wattegewichts
In the following the invention will be explained with reference to an exemplary embodiment and explained in more detail by drawings.
  • Fig. 1 Schematic representation of a card with hopper
  • Fig. 2 Schematic representation of the regulation of the cotton weight

Die Figur 1 zeigt eine Wanderdeckelkarde ausgestattet mit einem Füllschacht 9. Faserflocken 18 gelangen nach dem sie die verschiedenen Prozessstufen der Putzerei durchlaufen haben in den Oberschacht 1 des Füllschachtes 9. Die Faserflocken 18 werden durch die Speisevorrichtung 19, umfassend eine Speisemulde 2 und eine Speisewalze 3, an eine Auflösewalze 4 weitergegeben, welche die Faserflocken 18 weiter öffnet. Die Auflösewalze 4 gibt die weiter geöffneten Faserflocken 18 in den Unterschacht 5 ab. Das Vorhandensein einer derartigen Auflösewalze 4 ist für die Regelung des Wattegewichtes nicht notwendig, hat jedoch durch die verfeinerte Auflösung der Faserflocken Einfluss auf die Verdichtung der Faserflocken bei gleichem Druck im Unterschacht 5. Im Unterschacht 5 ist ein Drucksensor 20 zur Messung des aktuell herrschenden Druckes vorgesehen. Im Füllschacht 9 ist für die weitere Verdichtung der Watte eine Einblasvorrichtung 6 vorgesehen. Diese bläst weitere Luft in den Unterschacht 5 hinein und verdichtet dadurch die Faserflocken zu einer Watte mit höherem Wattegewicht. Die durch die Einblasvorrichtung 6 eingeblasene Luft strömt durch die Faserflocken. Dieser Luftstrom 7 verlässt den Schacht 5 durch den luftdurchlässigen Bereich 8 der Wandung des Unterschachtes 5 und wird zur Einblasvorrichtung 6 zurückgeführt. Als Einblasvorrichtung 6 eignet sich beispielsweise ein Ventilator. Der Ventilator führt die Luft im Kreis. Der durch den Ventilator erzeugte Druck im Unterschacht ist abhängig von der Luftdurchlässigkeit der Faserflocken und dem offenen Querschnitt der Wand 8 des Unterschachtes 5. Mit Hilfe der Absaugung 21 wird aus dem Kanalsystem der sich ablagernde Trash entfernt.The FIG. 1 Fibrous flakes 18 pass through the various process stages of the cleaning shop in the upper shaft 1 of the hopper 9. The fiber flakes 18 are through the feed device 19, comprising a feed trough 2 and a feed roller 3, passed on to an opening roller 4, which further opens the fiber flakes 18. The opening roller 4 releases the further opened fiber flakes 18 into the lower shaft 5. The presence of such an opening roller 4 is not necessary for the control of the cotton weight, but has by the refined resolution of the fiber flakes influence on the compression of the fiber flakes at the same pressure in the lower shaft 5. In the lower shaft 5, a pressure sensor 20 is provided for measuring the currently prevailing pressure , In the hopper 9, a blowing device 6 is provided for the further compression of the cotton. This blows more air into the lower shaft 5 and thereby compresses the fiber flakes into a cotton wool with a higher weight of cotton wool. The air blown in by the blowing device 6 flows through the fiber flakes. This air flow 7 leaves the shaft 5 through the air-permeable region 8 of the wall of the lower shaft 5 and is returned to the injection device 6. As blowing device 6, for example, a fan is suitable. The fan guides the air in a circle. The pressure generated by the fan in the lower shaft is dependent on the air permeability of the fiber flakes and the open cross section of the wall 8 of the lower shaft 5. With the help of the suction 21 is removed from the channel system of the depositing Trash.

Eine zweite Speisevorrichtung 10 speist schlussendlich die Faserflocken, nunmehr in Form einer homogenen Wattenvorlage 11, über eine Zuleitung dem Vorreissermodul 12 der Karde zu. Der Watteneinlauf erfolgt dabei mit einer Einlaufgeschwindigkeit v1. Die Vorreisser 12 öffnen die Faserflocken der Wattenvorlage 11 weiter auf und entfernen gleichzeitig einen Teil der Verunreinigungen. Die letzte Vorreisserwalze übergibt die Fasern schliesslich an die Kardentrommel 13, welche die Fasern vollständig auflöst und parallelisiert. Die Kardentrommel 13 arbeitet dazu mit dem Deckelaggregat 14 zusammen. Nachdem die Fasern zum Teil mehrere Umläufe auf der Kardentrommel 13 durchgeführt haben, werden sie von der Abnehmerwalze 15 abgenommen, einer bandbildenden Einheit 16 zugeführt und schliesslich in Form eines Kardenbandes in eine Kanne abgelegt (nicht gezeigt). Dabei verlässt das Kardenband die bandbildende Einheit 16 mit der Auslaufgeschwindigkeit v2. Am Ausgang der bandbildenden Einheit 16 ist schematisch ein Scheibenwalzenpaar 17 zur Messung des Bandgewichtes angeordnet.A second feed device 10 finally feeds the fiber flakes, now in the form of a homogeneous wadding 11, via a feed line to the licker-in module 12 of the card. The Watteneinlauf takes place with an inlet velocity v1. The lickerins 12 further open the fiber flakes of the wadding pad 11 and at the same time remove some of the contaminants. The last licker-in roller finally transfers the fibers to the card drum 13, which completely dissolves and parallelises the fibers. The carding drum 13 cooperates with the cover unit 14. After the fibers have partly performed several revolutions on the card drum 13, they are removed from the doffer roller 15, fed to a band-forming unit 16 and finally deposited in the form of a card sliver in a jug (not shown). In this case, the card sliver leaves the band-forming unit 16 with the exit speed v2. At the output of the belt-forming unit 16, a disk roller pair 17 for measuring the weight of the belt is arranged schematically.

Figur 2 zeigt in schematischer Darstellung die Regelung des Wattegewichts. Über ein Eingabegerät 40 erfolgt die Eingabe des Sollwertes für das Wattengewicht. Der Sollwert wird an die Steuerung 52 zur Zuordnung 41 des Sollwerts für den Druck im Unterschacht und zur Wattegewichtregelung 41 weitergegeben. Der zugewiesene Sollwert für den Druck im Unterschacht wird der Druckregelung 42 zugeführt. Die Druckregelung 42 ist mit einem Drucksensor 20 im Unterschacht verbunden, mit Hilfe dessen der Istwert des Druckes im Unterschacht ermittelt wird. Durch den Vergleich des Sollwertes für den Druck mit dem Istwert des Druckes wird durch die Druckregelung 42 eine Korrektur berechnet und ein entsprechendes Signal an das Stellmittel zur Veränderung des Druckes im Unterschacht, beispielsweise an die Speisevorrichtung 19, ausgegeben. Dieser Vorgang wiederholt sich, bis der Sollwert und der Istwert des Druckes innerhalb einer durch die Steuerung tolerierten Schwankung sind. In diesem Zustand ist die Druckregelung 42 in einem stabilen Betriebszustand. Der Zustand der Stabilität der Druckregelung 42 wird an die Wattegewichtregelung 49 über ein Signal 50 weitergeleitet. FIG. 2 shows a schematic representation of the regulation of the cotton weight. Via an input device 40, the input of the desired value for the batten weight. The setpoint is forwarded to the controller 52 for assignment 41 of the setpoint for the pressure in the lower shaft and the cotton weight control 41. The assigned setpoint for the pressure in the lower shaft is fed to the pressure control 42. The pressure control 42 is connected to a pressure sensor 20 in the lower shaft, by means of which the actual value of the pressure in the lower shaft is determined. By comparing the setpoint for the pressure with the actual value of the pressure, a correction is calculated by the pressure control 42 and a corresponding signal to the adjusting means for changing the pressure in the lower shaft, for example, to the feeder 19, output. This process repeats until the setpoint and the actual value of the pressure are within a variation tolerated by the controller. In this condition, the pressure control 42 is in a stable operating condition. The state of stability of the pressure control 42 is forwarded to the cotton weight control 49 via a signal 50.

Die Einlaufgeschwindigkeit v1 der Watte und die Auslaufgeschwindigkeit v2 des Kardenbandes werden der Berechnung 45 des Verzugs der Karde zugeführt. Der berechnete totale Verzug der Karde wird weitergeleitet an die Einheit 48 zur Berechnung des Istwertes des Wattegewichts. Zum Wert des totalen Verzugs der Karde werden im Berechnungsschritt 48 der Wert für das Bandgewicht 47 und die Abgangsmenge 46 hinzugefügt. Der daraus ermittelte Istwert des Wattegewichts wird an die Wattegewichtregelung 49 weitergegeben. Sobald nun in der Wattegewichtregelung 49 das Signal 50 über einen stabilen Betriebszustand der Druckregelung 42 vorliegt, wird durch den Vergleich des Sollwertes für das Wattegewicht mit dem Istwert des Wattegewichts eine Korrektur 51 des Sollwertes für den Druck im Unterschacht berechnet und durch die Wattegewichtregelung 49 ausgegeben.The entry speed v1 of the lap and the exit speed v2 of the card sliver are fed to the calculation 45 of the decay of the card. The calculated total delay of the card is forwarded to the unit 48 for calculating the actual value of the cotton weight. For the value of the total delay of the card, the value for the band weight 47 and the quantity 46 are added in the calculation step 48. The actual value of the cotton weight determined therefrom is forwarded to the cotton weight control 49. As soon as the signal 50 is present in the cotton weight control 49 via a stable operating state of the pressure control 42, a correction 51 of the desired value for the pressure in the lower shaft is calculated by the comparison of the target value for the cotton weight with the actual value of the cotton weight and output by the cotton weight control 49.

Aufgrund der Korrektur 51 des Sollwertes für den Druck wird die Druckregelung 42 entsprechend reagieren. Sobald wieder ein stabiler Betriebszustand der Druckregelung 42 erreicht wird, wird die Wattegewichtregelung 49 wieder aktiviert und der Vorgang wiederholt sich.Due to the correction 51 of the set value for the pressure, the pressure control 42 will react accordingly. As soon as a stable operating state of the pressure control 42 is reached, the cotton weight control 49 is reactivated and the process is repeated.

LegendeLegend

11
Oberschachtupper shaft
22
Speisemuldefeed trough
33
Speisewalzefeed roll
44
Auflösewalzeopening roller
55
Unterschachtunder Schacht
66
Einblasvorrichtungbubbler
77
Luftströmungairflow
88th
Luftdurchlässiger Bereich der WandungAir permeable area of the wall
99
Füllschachthopper
1010
Zweite SpeisevorrichtungSecond feed device
1111
WattenvorlageWatt template
1212
VorreissermodulVorreissermodul
1313
Kardentrommelcarding drum
1414
Deckelaggregatflat unit
1515
Abnehmerwalzedoffer
1616
Bandbildende EinheitBand-building unit
1717
ScheibenwalzenpaarDisc roller pair
1818
Flockenflakes
1919
Speisevorrichtungfeeder
2020
Drucksensorpressure sensor
2121
Absaugung von TrashExtraction of Trash
4040
Eingabe Sollwert WattegewichtEnter nominal cotton wool weight
4141
Zuordnung Sollwert DruckAssignment setpoint pressure
4242
Druckregelungpressure control
4545
Berechnung VerzugCalculation delay
4646
Abgangsmengeamount of waste
4747
Bandgewichtweight belt
4848
Zuordnung Istwert WattegewichtAssignment actual value cotton wool weight
4949
WattegewichtregelungCotton weight control
5050
Stabilität der Regelung DruckStability of the control pressure
5151
Korrekturfaktorcorrection factor
5252
Steuerungcontrol
v1v1
Einlaufgeschwindigkeitfeeding speed
v2v2
Auslaufgeschwindigkeitexit speed

Claims (6)

  1. A method for the regulation of the fiber feed to a card comprising a feed chute (9), which is subdivided into an upper chute (1) and a lower chute (5),
    - wherein fiber tufts are fed into the upper chute (1) and are transported into the lower chute (5) via a feed device (3), and the fiber tufts are compacted in the lower chute (5) under a certain pressure to form a batt (11) having a certain batt weight,
    - air is fed in the lower chute via a ventilator, thereby increasing the pressure over the fiber tufts,
    - the fed air is drawn out of the lower chute (5) through an air-permeable wall (8) and is fed back to the ventilator,
    - wherein the air-permeable wall (8) is partially covered by the fiber tufts in the lower chute (5),
    - wherein the pressure in the lower chute (5) is regulated via the feed device (19) by changing the partial covering of the air-permeable wall (8),
    characterized in that
    - a target value is predetermined for the batt weight, to which said target value a target value for the pressure in the lower chute (5) is assigned,
    - an actual value of the batt weight is determined, wherein the actual value of the batt weight is determined by means of a calculation based on a sliver weight at the card outfeed, a draft through the card, and a waste volume that is discarded in the card,
    - a correction of the target value for the pressure in the lower chute (5) is performed by means of a target-actual value comparison of the batt weight.
  2. The method according to claim 1, characterized in that the draft through the card is determined by means of the ratio of the infeed speed (v1) to the outfeed speed (v2).
  3. The method according to claim 1 or 2, characterized in that the waste volume discarded in the card is determined by means of a waste function depending on the production, wherein the waste function is determined by measurements.
  4. The method according to any one of claims 1 to 3, characterized in that the pressure in the lower chute (5) is additionally influenced by a regulation of the rotational speed of the ventilator.
  5. A device for carrying out the method according to any one of claims 1 to 4, comprising a feed chute (9) for receiving fiber tufts, the feed chute (9) is subdivided into an upper chute (1) and a lower chute (5), a feed device (19) is provided between the upper chute (1) and the lower chute (5) for the transport of the fiber tufts from the upper chute (1) into the lower chute (5), the lower chute (5) is connected to a ventilator for the infeed of air and comprises an air-permeable wall (8) for drafting the fed air and a device for feeding the drawn air to the ventilator and a pressure sensor (20), wherein a batt (11) having a certain batt weight is formed in the lower chute (5) by means of a certain pressure, and wherein the feed device (19) is provided for influencing the pressure in the lower chute (5),
    characterized in that
    a controller is provided for regulating the batt weight, wherein the controller comprises an input means (40) for the input of a target value for the batt weight and is connected to measurement means for determining an actual value for the batt weight, wherein the measurement means for determining an actual value for the batt weight comprises a measurement means for measuring a sliver weight at the card outfeed and a means for determining an infeed speed (v1) and an outfeed speed (v2) of the card and a measurement means for measuring a waste volume that is discarded in the card.
  6. The device according to claim 5, characterized in that additionally the ventilator (6) is provided for influencing the pressure.
EP13736631.6A 2012-06-29 2013-06-14 Method and device for controlling the fiber feed to a carding machine Active EP2867392B1 (en)

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CH00920/12A CH706658A1 (en) 2012-06-29 2012-06-29 Method and apparatus for controlling the supply of fiber to a carding machine.
PCT/IB2013/001240 WO2014001867A1 (en) 2012-06-29 2013-06-14 Method and device for controlling the fiber feed to a carding machine

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CH713862A1 (en) * 2017-06-08 2018-12-14 Rieter Ag Maschf Pressure control in a flock feed.
CH714679A1 (en) * 2018-02-26 2019-08-30 Rieter Ag Maschf Hopper discharge for feeding a card.
CH714843A1 (en) * 2018-03-29 2019-09-30 Rieter Ag Maschf Feed device to a card.
IT201800005659A1 (en) * 2018-05-24 2019-11-24 RIBBON IRONING DEVICE WITH CARDINATION FOR AIR SPINNING SYSTEMS, AIR SPINNING APPARATUS AND RELATIVE METHOD OF IRONING A BELT WITH CARDINE FOR AIR SPINNING SYSTEMS
CH715076A1 (en) * 2018-06-07 2019-12-13 Rieter Ag Maschf Level measurement of a fiber flake storage.
CN108754682B (en) * 2018-06-20 2021-06-15 赤峰东荣羊绒发展（集团）有限公司 Quick adjusting device for flat curtain speed and process period of fiber carding machine
WO2022233773A1 (en) * 2021-05-04 2022-11-10 Hubert Hergeth Material feed

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CH706658A1 (en) 2013-12-31
CN104379822B (en) 2016-10-26
EP2867392A1 (en) 2015-05-06
WO2014001867A1 (en) 2014-01-03
CN104379822A (en) 2015-02-25

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