EP3546625B1 - Dispositif d'alimentation pour une carde - Google Patents

Dispositif d'alimentation pour une carde Download PDF

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Publication number
EP3546625B1
EP3546625B1 EP19162734.8A EP19162734A EP3546625B1 EP 3546625 B1 EP3546625 B1 EP 3546625B1 EP 19162734 A EP19162734 A EP 19162734A EP 3546625 B1 EP3546625 B1 EP 3546625B1
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EP
European Patent Office
Prior art keywords
fiber
feed
feed channel
fan
pressure
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Active
Application number
EP19162734.8A
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German (de)
English (en)
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EP3546625A1 (fr
Inventor
Christian Müller
Roland Bischof
Pavel JELINEK
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Maschinenfabrik Rieter AG
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Maschinenfabrik Rieter AG
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Publication of EP3546625A1 publication Critical patent/EP3546625A1/fr
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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
    • D01G15/00—Carding machines or accessories; Card clothing; Burr-crushing or removing arrangements associated with carding or other preliminary-treatment machines
    • D01G15/02—Carding machines
    • D01G15/12—Details
    • D01G15/40—Feeding apparatus
    • 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

Definitions

  • the present invention relates to a device for feeding fiber material to a card with a feed chute, a feed chute discharge, a feed channel and a fan for compressing the fiber material into a fiber wad with a certain fiber wad weight in the feed channel, as well as a method for regulating the fiber wad weight.
  • the card produces a card sliver from the fiber material fed in, which is then further processed into a yarn.
  • a fleece can also be produced.
  • a feed chute is usually assigned to a card, which is supplied with fibers from a blow room by a conveyor system. The fibers are transported in the form of fiber flakes.
  • the filling chute is filled with fiber flocks from a transport system continuously or as required. Usually pneumatic transport systems are used. The fiber flocks are fed into the card from the filling chute with the aid of a feed device in the form of fiber wadding. The evenness of the fiber wadding entering the card plays an important role with regard to the service life of the working elements of the card and the requirements for the carding quality.
  • the evenness of the sliver or fleece produced by the card is also influenced by the evenness of the fiber wadding entering the card.
  • Another important technological parameter in the carding process is the weight of the fiber wadding entering the card.
  • the size of the fiber wadding weight and the infeed speed of the fiber wadding into the card essentially determine the production volume of a card and are jointly responsible for achieving a certain carding quality.
  • the weight of the fiber wadding which can be processed by the card is also determined by the product to be processed.
  • a feed roller that works together with a feed trough is arranged for the continuous withdrawal of the fiber flocks from the feed chute.
  • the fiber flocks drawn from the feed chute by the feed roller are fed through a Opening roller fed to a feed channel for additional opening and homogenization.
  • the fiber flocks are formed into a homogeneous fiber wadding template with the aid of compressed air, which is suitable for feeding the card.
  • a fan is also provided for the feed device, which allows a pressure increase in the feed channel and thereby a compression of the fiber flocks to form a fiber wadding.
  • the fiber flocks are compressed into fiber wadding by the pressure in the feed channel created by the fan.
  • the air flowing into the feed duct through the fan is drawn off again at the end of the feed duct via an air-permeable wall and returned to the fan.
  • Another type of hopper is disclosed, for example, by the CH 706 658 A1 .
  • This shows a two-part filling chute consisting of an upper chute and a lower chute.
  • the upper duct is filled with fiber flocks, then the fiber flocks are passed on from the upper duct to the lower duct via a feed device.
  • the fiber flocks are discharged from the lower chute in the form of fiber wadding and the fiber wadding is then fed to the card via a feed channel, with no devices for influencing the fiber wadding being provided in the feed channel.
  • the feed channel is only used to transport the fiber wadding from the lower duct to the card.
  • the disadvantage of this design is that a uniform automatic regulation of the density of the fiber mass or the filling level in the feed channel is not possible immediately before the transfer of the fiber wad to the card.
  • the object of the present invention is thus to enable a feed device with automatic regulation of the compression of the fiber wadding and the filling level in the feed channel and thus to achieve a feeding of the card with a uniform fiber wadding.
  • a further object of the invention is to achieve a constant and uniform feeding of the fiber wad to the card over the working width of the card by regulating the filling level in the feed channel.
  • a device for feeding fiber material to a card with a filling chute, a filling chute discharge, a feed channel and a fan for compressing the fiber material in the feed channel to a certain fiber wadding weight.
  • the feed chute discharge has a feed roller driven by a frequency converter with a feed trough for dosing the fiber material from the feed chute and an opening roller for transferring the fiber material from the feed roller to the feed channel.
  • a control is provided in which a target volume flow rate of the fan and a target pressure in the feed channel are assigned to a specific fiber batt weight for different fiber batt weights.
  • a pressure measurement is provided in the feed channel.
  • a regulation of the frequency converter of the drive of the feed roller is provided on the basis of a setpoint / actual comparison of the pressure in the feed channel while maintaining the setpoint volume flow. Since the evenness of the fiber wadding entering the card plays an important role, it is essential to control the fiber wadding properties at the end of the feed channel.
  • the air introduced into the feed duct by the fan is discharged from the feed duct at its end via an air-permeable part of the duct. If the feed channel is now filled with the fiber material, the air introduced by the fan must pass through the fiber material to the air-permeable part at the end of the feed channel. The fiber material is compressed by the air. The higher the compression of the fiber material, the more resistance the air flow from the fan experiences.
  • the size of the compression determines the weight of the fiber wadding of the fiber material compressed into a fiber wadding. This becomes the fiber batting weight determined by the resistance of the fiber material opposing the inflowing air.
  • the compaction of the fiber material is decisive for the fiber wadding weight to be achieved, which depends on the pressure applied to the fiber mass of the air introduced by the fan. On the basis of this dependency, a specification of the air flow to be introduced into the feed duct by the fan is provided in relation to its pressure.
  • the air By changing the filling level in the feed channel, the air is forced to flow through a larger mass of fiber material in order to reach the air-permeable wall of the feed channel. This means that the filling level in the feed channel is significantly influenced by the air volume flow. By regulating the air volume flow, the filling level in the feed channel is determined.
  • Different types of fibers and fiber blends are processed in the card. These differ in their specific properties such as material (cotton, synthetic fibers, viscose, etc.) or fiber lengths (for example short or medium staples) or the proportions of different fibers in a fiber blend.
  • material cotton, synthetic fibers, viscose, etc.
  • fiber lengths for example short or medium staples
  • proportions of different fibers in a fiber blend are determined on the basis of the fiber material to be processed, the production quantity to be achieved and the requirements for the carding quality.
  • a corresponding fiber wadding weight is determined for feeding the card.
  • the determination of the fiber wadding weight of the fiber material to be fed is based on the operational experience of the spinning mill staff.
  • Setpoint values for the pressure in the feed duct and the volume flow of the fan are stored in the control for the various fiber wadding weights.
  • the pressure measurement arranged in the feed channel enables the specified target pressure to be maintained by regulating the speed of the feed roller and thus the amount of fiber material
  • a fiber batt weight control is advantageously provided in the control.
  • the controller determines an actual value for the fiber wadding weight. Determinations of the actual fiber wadding weight are known from the prior art, for example US Pat EP 2 867 392 A1 such a procedure. If there is now a discrepancy between the predetermined target fiber wadding weight, on the basis of which the target values for volume flow and pressure of the fan were assigned, and the actual fiber wadding weight, the target values for the pressure are corrected while maintaining the target value for the volume flow of the fan. This is due to the fact that a correction of the fiber batt weight requires a change in the pressure in the feed channel. The filling level of the feed channel, which is determined by the volume flow, can, however, be left as it is.
  • the actual value of the fiber wadding weight is determined by a calculation from the weight of the card sliver or fleece produced, a total draft of the card and a separated waste quantity.
  • the individual fibers of the fiber material are parallelized in the card and leave the card in the form of a fleece or card sliver.
  • the fiber wadding is pulled apart so that the card sliver produced leaves the card at a higher exit speed than the entry speed of the fiber wadding into the card. This process is called delay.
  • delay takes place over several rollers arranged in the card.
  • the individual distortions that occur from roller to roller can be added together in what is known as a total delay of the card. Due to the operating state of a card, its total draft is known and is determined by the machine control itself.
  • the total draft of a card corresponds to the ratio of the exit speed of the card sliver or fleece to the Infeed speed of the fiber wadding.
  • the machine control determines the speed of the motors and, accordingly, the circumferential speeds of the rollers driven by the motors from the control values output to the corresponding motors.
  • Other means of determining the inlet speed or the outlet speed are, for example, speed measurements of the rollers or shafts.
  • the determination of the waste function is usually done once for a machine type and a fiber material to be processed by empirically measuring the waste quantity with different production conditions and different fiber material.
  • the sliver weight at the card outlet is measured, for example, by measuring a disc roller distance or radiometric measuring systems for measuring a web.
  • the fan preferably has a drive with a frequency converter for speed control. This allows the fan to be set directly to the new setpoints by the control.
  • a control gear or a control element can be provided in an air inlet or an air outlet channel of the fan.
  • the definition of a new target value for the speed is necessary in order to achieve an even distribution of the fiber material over the entire width of the feed channel. An uneven distribution of the fiber material leads to a non-uniform fiber wadding in the feed channel, seen across the working width of the card. In this case, the weight of the fiber wadding would not be the same over the entire width of the card due to the formation of holes or tearing of the edges of the fiber wadding at the outer ends of the feed channel.
  • a sensor is provided for measuring an opening of the feed trough.
  • the density or compactness of the fiber flocks that are removed from the feed chute by the feed roller also has an effect on the fiber wadding to be formed in the feed channel. With a high density, the air permeability of the fiber material is reduced and a lower filling level is achieved in the feed channel with the same setpoint for the pressure. Compensating for this phenomenon by regulating the pressure in the feed channel is, however, not always satisfactory, since sluggish regulation results in too long a response time and a blockage of the feed channel can result if the filling level rises briefly.
  • the feeding trough is resilient and is opened or closed by the fiber flocks as required.
  • the sensor which detects the position of the feed trough, detects a change in the density of the fiber flocks at an early stage and can be used to control the speed of the feed roller. This makes it possible to reduce the feed when dense fiber flakes occur and to avoid clogging of the feed channel.
  • the design of the sensor can be a design of the feed trough or its movement, a distance sensor or a path measurement (for example inductive or capacitive mode of operation) or a rotation angle sensor.
  • the feed can be increased by increasing the speed of the feed roller and there is no emptying of the feed channel due to an undersupply.
  • the density of the fiber flocks By taking into account the density of the fiber flocks by measuring the opening of the feed trough, a short construction of the feed channel is made possible.
  • the device for feeding fiber material to a card comprises a feed channel and a fan for compressing the fiber material in the feed channel to a certain fiber wadding weight.
  • the fan has a drive with a frequency converter for speed control or a regulating element for regulating the volume flow.
  • a fill sensor for measuring a fill level is provided in the feed channel.
  • the filling sensor can be designed as a single or multiple sensors. The evenness of the filling level must be ensured over the entire working width of the card. For example, optical or also transmitted light sensors are conceivable as types of construction of the sensor. Due to the design, a specified fill level (target value) for a certain design of a feed channel is the same for all types of application due to the geometry.
  • a volume flow control which calculates a correction of the speed of the fan or the position of the regulating element from a comparison of the measured filling level with a target filling level.
  • the target fill level can be available as a fixed value due to the built-in feed channel in the controller. Alternatively, this fixed value can also be determined by the installation location of the filling sensor, so that a direct measurement of the difference to the target filling level results from the measurement of the filling level.
  • a method for feeding a card is also proposed, with a certain amount of fiber material, the fiber material being brought into a feed channel from a feed chute with a feed roller which cooperates with a feed trough via an opening roller downstream of the feed roller and to one in the feed channel with a fan
  • Fiber wadding is compressed with a fiber wadding weight.
  • a desired volume flow rate of the fan and a desired pressure in the feed channel are assigned to a selected fiber wadding weight to be fed.
  • An actual pressure is measured in the feed channel with a pressure sensor and the feed roller is driven by a Frequency converter regulated on the basis of a setpoint / actual comparison of the pressure in the feed duct while maintaining the setpoint volume flow.
  • the assignment of the desired pressure based on the selected fiber wadding weight is influenced by a fiber wadding weight control while maintaining the desired volume flow. Too high a volume flow of the air in the feed channel can result in uneven compression of the fiber wadding due to the formation of exhaust air channels through the fiber wadding from the feed channel to the air-permeable area of the wall of the feed channel.
  • a change in the setpoint pressure due to the fiber wadding weight control is preferably compensated for while the setpoint volume flow rate remains the same by a corresponding adjustment of the speed of the feed roller.
  • the speed is adjusted via a frequency converter belonging to the drive or a control gear. It is also advantageous if, in order to maintain a filling level, compensation is made by a corresponding adaptation of the speed of the fan or a position of the control element.
  • an opening of the feed trough is measured with a sensor.
  • the measured opening of the feed trough can preferably act as a correction factor on the regulation of the feed roller. This serves to prevent blockages or undersupply in the feed channel due to a changing density of the fiber flocks in the filling chute.
  • Figure 1 shows a card 1 equipped with a feed chute 2, a feed chute 5 and a feed channel 3. After they have passed through the various process stages of a blow room, fiber flocks 4 arrive in the feed chute 2.
  • the fiber flocks 4 are fed through the feed chute 5, comprising a feed roller 6 and an opening roller 7 and a supply of air 8, passed on to the feed channel 3.
  • a supply of air 8 is provided to support the tuft transfer from the opening roller 7 to the feed channel 3 and to ensure compression of the fiber wadding 11 in front of a feed device 10 of the card 1.
  • the air supply blows air 8 tangentially along the opening roller 7 into the feed channel 3 and thereby compresses the fiber flocks into a fiber wadding 11 with a high fiber wadding weight necessary for further processing in the card 1.
  • the air 8 blown in through the air supply flows through the fiber flocks which are discharged from the opening roller 7 into the feed channel 3. This air flow leaves the feed channel 3 through the air-permeable area 9 of the wall at the end of the feed channel 3.
  • a feed device 10 following the feed channel 3 feeds the fiber flocks, now in the form of a homogeneous fiber wadding 11, to the licker-in module 12 of the card 1.
  • a card feed roller with a feed trough for metering the fiber wadding 11 is provided for the feed device 10.
  • the fiber flocks discharged from the fiber wadding template 11 by the feed device 10 are opened further by the lickerins contained in the lickerin module 12 and at the same time freed from some of the impurities contained therein.
  • the last lickerin of the lickerin module 12 finally transfers the fibers to the card drum 13, which completely dissolves and parallelizes the fibers.
  • the card drum 13 works together with the cover assembly 14 for this purpose.
  • the fibers After the fibers have partially made several revolutions on the card drum 13, they are removed from the card drum 13 by the doffing roller 15, fed to a sliver-forming unit 16 and finally deposited in a can in the form of a card sliver 17 (not shown).
  • FIG. 2 shows a schematic representation of a device according to the invention in a first embodiment.
  • Fiber flocks 4 are removed from a feed chute 2 with a feed roller 6.
  • the feed roller 6 works together with a feed trough 25.
  • the feed trough 25 is provided with a spring feed 26 which presses the feed trough 25 against the feed roller 6.
  • the feed trough 25 is opened more or less against the spring feed 26 by the fiber flocks 4 drawn from the feed chute 2 by the feed roller 6, depending on the density of the fiber flocks 4.
  • the feed roller 6 forwards the fiber flocks 4 to an opening roller 7.
  • the opening roller 7 transfers the fiber flocks 4 from the feed roller 6 into a feed channel 3, in which the fiber flocks 4 are transported on to the card.
  • air 8 is introduced into the feed channel 3 through an air supply channel 19 from a fan 18 with a drive 20.
  • the fiber flocks in the feed channel 3 are transported against the card by the air and compacted to form a fiber wadding 11 at the end of the feed channel 3.
  • the air 8 introduced into the feed duct 3 by the fan 18 is discharged again from the feed duct 3 via an air-permeable area 9 in a wall of the feed duct 3 at its end and returned to the fan 18 via a return line 28.
  • a false air opening 29 is provided in the return line 28.
  • the secondary air opening 29 serves to compensate for losses of air at possibly leaky points in the entire air duct from and to the fan 18.
  • a fiber wadding 11 is formed from the fiber flocks at the end of the feed channel 3 by the air 8 and this is compressed by the air pressure. The pressure arises due to a resistance which the air 8 has to overcome by flowing through the fiber wadding 11 in order to pass through the air-permeable area 9 from the feed channel 3 into the return line 28.
  • a fiber wadding 11 with a certain filling height 34 is formed in the feed channel 3.
  • a pressure sensor 24 for measuring an actual pressure of the air 8 in the feed channel 3 is provided in the feed channel 3.
  • the pressure in the feed channel 3 is decisive for the density of the fiber wadding 11 and thus a standard for a fiber wadding weight W to be achieved at the end of the feed channel 3.
  • a controller 31 is also shown. Characteristic curves for a target volume flow V and a target pressure P for the air 8 are stored in the controller 31.
  • a desired fiber wadding weight W is entered into the controller 31 via the input 33.
  • the controller 31 assigns the corresponding nominal volume flow rate V and the nominal pressure P to this fiber wadding weight W.
  • An actual pressure in the feed channel 3 is measured via the pressure sensor 24.
  • a corresponding correction of the speed of the feed roller 6 is calculated in the controller by a set-actual value comparison of the pressure and the speed of the feed roller 6 is corrected via a frequency converter 23 which acts on the drive 22 of the feed roller 6. This ensures a constant pressure and a constant volume flow in the feed channel 3.
  • FIG. 3 shows a schematic representation of a device according to the invention in a further embodiment.
  • the present arrangement of the device containing a filling chute 2, a feed roller 6, a feed trough 25 with a spring load 26, an opening roller 7 and a feed channel 3 as well as a fan 18 with an air supply channel 19 and a return line 28 are identical to the arrangement according to Figure 2 .
  • the description of the false air opening 29, the air-permeable area 9 and the filling level 34 of FIG Figure 2 refer to.
  • a pressure sensor 24 for measuring an actual pressure of the air 8 in the feed channel 3 is provided in the feed channel 3.
  • the pressure in the feed channel 3 is decisive for the density of the fiber wadding 11 and thus a standard for a fiber wadding weight W to be achieved at the end of the feed channel 3.
  • a controller 31 is also shown. Characteristic curves for a target volume flow V and a target pressure P for the air 8 are stored in the controller 31.
  • a desired fiber wadding weight W is entered into the controller 31 via the input 33.
  • the controller 31 assigns the corresponding nominal volume flow rate V and the nominal pressure P to this fiber wadding weight W.
  • An actual pressure in the feed channel 3 is measured via the pressure sensor 24.
  • a corresponding correction of the speed of the feed roller 6 is made in the control by means of a target / actual value comparison of the pressure calculated and via a frequency converter 23 which acts on the drive 22 of the feed roller 6, the speed of the feed roller 6 is corrected. This ensures a constant pressure and a constant volume flow in the feed channel 3.
  • the control 31 is linked to a fiber batt weight control 30.
  • a nominal fiber wadding weight which corresponds to the input 33 of the fiber wadding weight, is compared with an actual fiber wadding weight on the card.
  • the setpoint pressure P in the feed channel 3 is increased by the controller 31.
  • the speed of the drive 22 of the feed roller 6 is changed via a frequency converter 23 by the controller 31.
  • the controller 31 can adjust the speed of the drive 20 of the fan 18 via a frequency converter 21 or, alternatively, instead of the speed of the fan 18, a control element can be used in the return line 28 32 may be provided, which also enables the volume flow to be changed. Too high a volume flow of the air 8 in the feed channel 3 can result in uneven compression of the fiber wadding 11 due to the formation of exhaust air channels through the fiber wadding 11 from the feed channel 3 to the air-permeable area 9 of the wall of the feed channel 3.
  • an opening sensor 27 is also provided on the feed trough 25.
  • the opening sensor 27 measures the opening state of the feed trough 25 and thereby provides information about the density of the fiber flocks 4 currently being removed from the feed chute 2 by the feed roller 6 the feed tray 6 switched on.
  • Figure 4 shows a schematic representation of a device according to the invention with a control of the filling level 34.
  • the present arrangement of the device in relation to a feed chute 2 with fiber flocks 4, a feed roller 6, a feed trough 25, an opening roller 7 and a feed channel 3 partially filled with a fiber wadding 11 and a fan 18 with an air supply duct 19 and a return line 28 are identical to the arrangement according to Figure 2 .
  • the description of the false air opening 29, the air-permeable area 9 and the filling level 34 of FIG Figure 2 refer to.
  • the fan 18 conveys air 8 with a certain volume flow through the air supply channel 19 and the feed channel 3 to the fiber wadding 11.
  • a filling height 34 is formed at the end of the supply channel 3 which denotes the area of the supply channel 3 filled with fiber wadding 11.
  • a fill sensor 35 is arranged in the area of the target fill level. The filling sensor 35 transmits the current filling level 34 or a difference between the current filling level 34 and a target filling level to a volume flow controller 36.
  • the volume flow controller 36 regulates the speed of the fan 18 or its drive 20 with the aid of a frequency converter 21 via a corresponding control signal Regulating member 32 can be changed accordingly in its position.

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

Claims (14)

  1. Dispositif d'alimentation en matière fibreuse (4) d'une carde (1) comportant une goulotte de remplissage (2), une évacuation de goulotte de remplissage (5), un canal d'alimentation (3) et un ventilateur (18) permettant de comprimer la matière fibreuse (4), dans le canal d'alimentation (3), à un poids de ouate de fibres déterminé, l'évacuation de goulotte de remplissage (5) présentant un cylindre d'alimentation (6) entraîné par un convertisseur de fréquence (23) comportant une auge d'alimentation (25) permettant de doser la matière fibreuse (4) hors de la goulotte de remplissage (3) et un cylindre couvert (7) permettant le transfert de la matière fibreuse (4) du cylindre d'alimentation (6) au canal d'alimentation (3), une commande (31) étant prévue, dans laquelle, pour différents poids de ouate de fibres (W), un débit volumique cible (V) du ventilateur (18) et une pression cible (P) dans le canal d'alimentation (3) étant respectivement attribués à un poids de ouate de fibres (W) déterminé, et une mesure de pression (24) permettant de mesurer une pression réelle étant prévue dans le canal d'alimentation (3), une régulation du convertisseur de fréquence (23) de l'entraînement (22) du cylindre d'alimentation (6) étant prévue dans la commande (31) sur la base d'une comparaison réelle/cible de la pression dans le canal d'alimentation (3), tout en maintenant le débit volumique cible.
  2. Dispositif selon la revendication 1, dans lequel une régulation du poids de ouate de fibres (30) est prévue dans la commande, une détermination d'une valeur réelle du poids de ouate de fibres par la commande (31) étant prévue et, lors d'un écart par rapport au poids de ouate de fibres (W) cible prédéterminé, une correction de la pression cible (P) étant prévue.
  3. Dispositif selon la revendication 1 ou 2, dans lequel le ventilateur (18) présente un entraînement (20) comportant un convertisseur de fréquence (21) permettant la commande de la vitesse de rotation.
  4. Dispositif selon la revendication 1 ou 2, dans lequel un élément de régulation (32) est prévu dans un canal d'entrée d'air ou de sortie d'air du ventilateur (18).
  5. Dispositif selon l'une des revendications précédentes, dans lequel un capteur (27) est prévu pour mesurer une ouverture de l'auge d'alimentation (25).
  6. Dispositif selon l'une des revendications précédentes, dans lequel le ventilateur (18) présente un entraînement (20) comportant un convertisseur de fréquence (21) permettant la commande de la vitesse de rotation ou un élément de régulation (32) permettant la régulation du débit volumique et un capteur de remplissage (35) est prévu dans le canal d'alimentation (3) pour mesurer un niveau de remplissage (34).
  7. Dispositif selon la revendication 6, dans lequel une commande de débit volumique (36) est prévue, laquelle calcule une correction de la vitesse de rotation du ventilateur (18) ou de la position de l'élément de régulation (32) à partir d'une comparaison du niveau de remplissage (34) mesuré avec un niveau de remplissage cible.
  8. Carde (1) comportant au moins un dispositif selon l'une des revendications 1 à 7.
  9. Procédé d'alimentation en une quantité déterminée de matière fibreuse (4) d'une carde (1), dans lequel la matière fibreuse (4) est amenée depuis une goulotte de remplissage (2) au moyen d'un cylindre d'alimentation (6), lequel coopère avec une auge d'alimentation (25), par l'intermédiaire d'un cylindre couvert (7) disposé en aval du cylindre d'alimentation (6), dans un canal d'alimentation (3) et est comprimée dans le canal d'alimentation (3) au moyen d'un ventilateur (18) pour former une ouate de fibres (11) avec un poids de ouate de fibres (W), un débit volumique cible (V) du ventilateur (18) et une pression cible (P) dans le canal d'alimentation (3) étant attribués à un poids de ouate de fibres (W) sélectionné à alimenter, et une pression réelle étant mesurée dans le canal d'alimentation (3) au moyen d'un capteur de pression (24) et un entraînement (22) du cylindre d'alimentation (6) étant régulé par l'intermédiaire d'un convertisseur de fréquence (23) sur la base d'une comparaison cible/réelle de la pression dans le canal d'alimentation (3), tout en maintenant le débit volumique cible.
  10. Procédé selon la revendication 9, dans lequel l'attribution de la pression cible (P) est influencée par le poids de ouate de fibres (W) sélectionné par une régulation de poids de ouate de fibres (30), une valeur réelle du poids de ouate de fibres étant déterminée par la commande (31) et, en cas d'un écart par rapport au poids de ouate de fibres (W) cible prédéterminé, une correction de la pression cible (P) est effectuée.
  11. Procédé selon la revendication 10, dans lequel une modification de la pression cible (P) sur la base de la régulation du poids de ouate de fibres (30) est compensée par un ajustement correspondant de la vitesse de rotation du cylindre d'alimentation (6).
  12. Procédé selon les revendications 9 à 11, dans lequel la rétention d'un niveau de remplissage (34) est compensée par un ajustement correspondant de la vitesse de rotation du ventilateur (18) ou d'une position de l'élément de régulation (32).
  13. Procédé selon les revendications 9 à 12, dans lequel une ouverture de l'auge d'alimentation (25) est mesurée au moyen d'un capteur (27).
  14. Procédé selon la revendication 13, dans lequel l'ouverture mesurée de l'auge d'alimentation (25) agit comme un facteur de correction sur la régulation (31) du cylindre d'alimentation (6).
EP19162734.8A 2018-03-29 2019-03-14 Dispositif d'alimentation pour une carde Active EP3546625B1 (fr)

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CH00420/18A CH714843A1 (de) 2018-03-29 2018-03-29 Speisevorrichtung zu einer Karde.

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CN111101242A (zh) * 2019-12-02 2020-05-05 莫永献 一种纺织用高效除杂梳棉机
CN111793861B (zh) * 2020-07-26 2022-04-01 潍坊驼王实业有限公司 一种聚丙烯短纤无纺土工布制作用梳棉装置
CN116837497A (zh) * 2023-07-07 2023-10-03 浙江中超新材料股份有限公司 变频调速给棉机及其使用方法

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IN171722B (fr) * 1987-10-08 1992-12-19 Rieter Ag Maschf
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CH714843A1 (de) 2019-09-30
EP3546625A1 (fr) 2019-10-02
CN110318124B (zh) 2023-02-24

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