WO2022043036A1 - Commande d'un dispositif de traitement de fibres - Google Patents

Commande d'un dispositif de traitement de fibres Download PDF

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Publication number
WO2022043036A1
WO2022043036A1 PCT/EP2021/072115 EP2021072115W WO2022043036A1 WO 2022043036 A1 WO2022043036 A1 WO 2022043036A1 EP 2021072115 W EP2021072115 W EP 2021072115W WO 2022043036 A1 WO2022043036 A1 WO 2022043036A1
Authority
WO
WIPO (PCT)
Prior art keywords
treatment
tools
gap
tool
synchronous motor
Prior art date
Application number
PCT/EP2021/072115
Other languages
German (de)
English (en)
Inventor
Martin Heim
Adrian HONIG
Stefan Reinhardt
Original Assignee
Voith Patent Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Patent Gmbh filed Critical Voith Patent Gmbh
Priority to EP21759058.7A priority Critical patent/EP4204625A1/fr
Priority to CN202180053278.3A priority patent/CN116096960A/zh
Publication of WO2022043036A1 publication Critical patent/WO2022043036A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C7/00—Crushing or disintegrating by disc mills
    • B02C7/11—Details
    • B02C7/14—Adjusting, applying pressure to, or controlling distance between, discs
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D21D1/30—Disc mills

Definitions

  • the invention relates to an arrangement for controlling a device for treating fibrous material, the device having a housing in which at least a first treatment tool and a second treatment tool are arranged, the treatment tools have a rotationally symmetrical shape, are arranged coaxially to one another, rotate relative to one another rotate a common axis, two treatment tools in each case delimit a treatment gap through which the fibrous material flows radially, the treatment tools each have a treatment profile pointing towards the treatment gap and the axial position of at least one treatment tool can be adjusted via an adjustment device.
  • the invention also relates to a method for controlling a device for treating fibrous material, the device having a housing in which at least a first treatment tool and a second treatment tool are arranged, the treatment tools have a rotationally symmetrical shape, are arranged coaxially to one another, rotate relative to one another rotate a common axis, two treatment tools in each case delimit a treatment gap through which the fibrous material flows radially, the treatment tools each have a treatment profile pointing towards the treatment gap and the axial position of at least one treatment tool can be adjusted via an adjustment device.
  • a device is known, for example, from US 2007/0125891 A1.
  • Devices of the above kind become e.g. B. used to improve the quality of pulp, TMP or pulp that was obtained from waste paper.
  • the height of the treatment profile of the treatment tools is reduced, the treatment gap, which has been enlarged as a result, leads to a reduction in idling or pumping power. With the overall performance remaining the same, this leads at the same time to an increase in the specific performance of the device, which is relevant for the desired treatment intensity, and thus to excessive treatment, in particular grinding of the fibers.
  • the grinding surfaces are formed by replaceable grinding sets screwed to the corresponding base plate.
  • the beating clothing In order to achieve the desired fiber properties, in particular the degree of beating, the beating clothing must be optimally adapted to the fibrous material to be treated, also in order to prevent excessive wear of the clothing.
  • the refiners can be designed as disc refiners or cone refiners.
  • Double-slit arrangements are increasingly being used to increase throughput. Due to the axially floating rotor, no reliable statements can be made about the gap width and the state of wear.
  • the object of the invention is to improve the control of these devices with the simplest possible means.
  • the object was achieved in that the adjusting device includes a synchronous motor.
  • the synchronous motor can maintain the set operating state, so that no readjustment of the axial adjustment of the treatment tool is required.
  • synchronous motors as actuators are very precise, which is why they can be used to advantage as part of a position sensor for the axially displaceable treatment tool.
  • the synchronous motor can also be used as part of a wear measuring unit.
  • the invention is preferably used in devices in which there are two treatment gaps in the housing and the two middle treatment tools are attached to a common, rotating base plate which is mounted in an axially floating manner.
  • the synchronous motor can be used as part of a gap width measuring unit.
  • the position of the axially adjustable treatment tool is used to infer the total width of the treatment gap or both treatment gaps together and thus the operating state of the treatment device.
  • the axial force with which the treatment tools are pressed axially against one another is controlled via the torque of the synchronous motor. This prevents excessive loading and thus excessive energy consumption. When the load is relieved, limiting the torque can prevent damage to the adjustment device.
  • the specific torque of the synchronous motor is essentially independent of the speed, which makes this motor particularly suitable for small, axial adjustments of the treatment tool.
  • the axial force with which the adjustable treatment tool is pressed in the direction of the treatment gap can be set relatively precisely via the torque. In this way, a wear-critical condition (prolonged contact between the treatment tools or too little fibrous suspension cushion in a treatment gap) can be avoided. Closing the treatment gap is of particular importance during start-up, especially after commissioning or after changing the treatment tools. In order to avoid damaging the treatment profile, the approach usually takes place at several speed levels. However, the gradual reduction requires a relatively large amount of time.
  • the synchronous motor allows the treatment gap to be closed over at least 80%, preferably over at least 90%, in particular at least 95% of the axial travel of the treatment tool at a constant speed.
  • the closing speed should only be reduced when the power consumption of the main drive for rotating the treatment tools exceeds a limit value.
  • the treatment gap may be closed at least in sections at a continuously reduced speed.
  • the torque during closing can be set to a safe, lower value independently of the speed control.
  • FIG. 1 a double disc refiner in the open state
  • FIG. 2 a side view of the closed refiner and FIG. 3: a schematic cross section through the refiner.
  • the annular treatment profile 10 of these treatment tools 1, 2, 3, pointing towards the treatment gap 11, 12, is formed by grinding sets which have a large number of essentially radially running grinding bars on the profile side. so that this profile is formed by these grinding bars and the grooves in between.
  • the fiber suspension to be ground arrives here via an inlet through the center of the device into one of the two treatment gaps 11, 12 between the grinding sets.
  • the fiber suspension then passes through the cooperating treatment tools
  • the cross-section of the grinding bars also called knives, is generally rectangular, but other shapes also exist.
  • the upper side of these grinding bars that is to say the surfaces bearing the grinding edges, which close off the respective grinding set in the direction of the counter-set, lie in the radial plane.
  • the grooves running between the milling bars also have a rectangular cross-section and serve as flow channels for the fiber suspension.
  • the groove depth is usually between 2 and 20 mm.
  • this axis 5 is driven by a drive 16 coupled via a gear 15.
  • the housing of the device is formed, in particular according to FIG.
  • These two housing parts 7, 8, each carrying a non-rotating treatment tool 1, 4, are coupled to one another via a joint 9, which can be rotated about a joint axis 13 and is designed in two parts, for example.
  • the fibrous suspension cushion in a treatment gap 11, 12 may not be sufficiently large, or the treatment tools 1, 2, 3, 4 may even come into contact.
  • the vibrations of the device are often monitored via at least one sensor.
  • the axial position of the non-rotating treatment tool 1 carried by the pivotable housing part 8 is adjusted by the adjustment device 6 to widen the treatment gap 11, 12 adjusted accordingly.
  • the treatment gaps 11, 12 are closed by the axial displacement of the non-rotating treatment tool 1 by means of the adjusting device 6, which according to the invention comprises a synchronous motor to ensure improved precision.
  • the adjusting device 6 has a frequency converter for controlling the synchronous motor, a gearbox for adapting the motor speed to the required speed and a spindle lifting element coupled to the gearbox, which converts the rotation into an axial movement for adjusting the non-rotating treatment tool 1.
  • the closing of the treatment gaps 11, 12 during the start-up or a change of the treatment tools 1, 2, 3, 4 is particularly critical, since an optimal position of the adjustable treatment tool 1 then has to be sought.
  • the synchronous motor works extremely precisely, it is particularly suitable as a servomotor.
  • the position of the axially displaceable treatment tool 1 can be easily deduced from the known detection of the change in position of the rotor of the synchronous motor.
  • the synchronous motor is thus part of a position sensor for the axially displaceable treatment tool 1, which makes additional and relatively expensive position sensors superfluous and thus also the detection of the wear of the treatment tools 1, 2, 3, 4 and the total width of both treatment gaps 11, 12 permitted.
  • the axial force with which the treatment tools 1, 2, 3, 4 are pressed against one another can be controlled relatively easily via the torque of the synchronous motor by means of the frequency converter.
  • the treatment tools 1, 2, 3, 4 have hitherto been brought together in several stages at decreasing axial speeds.
  • the precision of the adjustment path when using a synchronous motor now allows the treatment gap 11, 12 to be closed over at least 80%, preferably over at least 90%, in particular at least 95% of the adjustment path at a constant speed.
  • the time required to close the treatment gaps 11, 12 is significantly reduced. Only at the end of the closing, in particular when the power consumption of the drive 16 exceeds a limit value, does the speed of the axial displacement decrease continuously.
  • the axial speed can also decrease continuously during the entire closing of the roller gaps 11 , 12 .
  • the invention can also be used with conical grinding surfaces, the cone axis coinciding with the axis of rotation 5 and with devices with only one treatment gap.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Paper (AREA)

Abstract

L'invention concerne un agencement et une pluralité de procédés de commande d'un dispositif de traitement d'un matériau fibreux, le dispositif présentant un boîtier dans lequel au moins un premier outil de traitement (1, 3) et un second outil de traitement (2, 4) sont agencés, les outils de traitement (1, 2, 3, 4) ayant une forme symétrique en rotation et étant disposés coaxialement l'un par rapport à l'autre et tournant l'un par rapport à l'autre autour d'un axe commun (5), dans chaque cas deux outils de traitement (1, 2, 3, 4) délimitant une ligne de contact de traitement (11, 12) à travers laquelle le matériau fibreux s'écoule radialement, les outils de traitement (1, 2, 3, 4) ayant chacun un profil de traitement (10) qui pointe vers la ligne de contact de traitement (11, 12), et la position axiale d'au moins un outil de traitement (1, 2, 3, 4) pouvant être définie par l'intermédiaire d'un dispositif de réglage (6). L'invention vise à simplifier et fiabiliser sensiblement la commande grâce au dispositif de réglage (6) comprenant un moteur synchrone.
PCT/EP2021/072115 2020-08-31 2021-08-09 Commande d'un dispositif de traitement de fibres WO2022043036A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP21759058.7A EP4204625A1 (fr) 2020-08-31 2021-08-09 Commande d'un dispositif de traitement de fibres
CN202180053278.3A CN116096960A (zh) 2020-08-31 2021-08-09 纤维处理设备的控制

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020122645.4 2020-08-31
DE102020122645.4A DE102020122645A1 (de) 2020-08-31 2020-08-31 Steuerung einer Faserbehandlungsvorrichtung

Publications (1)

Publication Number Publication Date
WO2022043036A1 true WO2022043036A1 (fr) 2022-03-03

Family

ID=77465973

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2021/072115 WO2022043036A1 (fr) 2020-08-31 2021-08-09 Commande d'un dispositif de traitement de fibres

Country Status (4)

Country Link
EP (1) EP4204625A1 (fr)
CN (1) CN116096960A (fr)
DE (1) DE102020122645A1 (fr)
WO (1) WO2022043036A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024052199A1 (fr) 2022-09-07 2024-03-14 Voith Patent Gmbh Dispositif de changement de rotor pour raffineur

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2145096B1 (de) * 1971-09-09 1973-01-11 Paul Hauser Koruma-Maschinen, 7844 Neuenburg Einrichtung zur automatischen mahlspalt-steuerung bei einer muehle
DE2923507A1 (de) * 1978-06-26 1980-01-17 Rolf Bertil Reinhall Verfahren und vorrichtung bei mahlapparaten fuer lignozellulosehaltiges gut
DE10196894T5 (de) * 2001-08-27 2004-10-07 Mitsubishi Electric Corp Sensorlose Steuervorrichtung eines Synchronmotors
US20070125891A1 (en) 2005-12-05 2007-06-07 Crossley Bruce R Refining member clash control method

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2130277C (fr) 1993-08-25 2004-03-30 Bruce James Allison Regulation automatique de charge pour raffineur
FI126206B (fi) 2011-06-23 2016-08-15 Upm Kymmene Corp Menetelmä ja laitteisto selluloosapitoisten materiaalien fibrilloimiseksi
DE102017127771A1 (de) 2017-11-24 2019-05-29 Voith Patent Gmbh Steuerung der Faserstoffbehandlung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2145096B1 (de) * 1971-09-09 1973-01-11 Paul Hauser Koruma-Maschinen, 7844 Neuenburg Einrichtung zur automatischen mahlspalt-steuerung bei einer muehle
DE2923507A1 (de) * 1978-06-26 1980-01-17 Rolf Bertil Reinhall Verfahren und vorrichtung bei mahlapparaten fuer lignozellulosehaltiges gut
DE10196894T5 (de) * 2001-08-27 2004-10-07 Mitsubishi Electric Corp Sensorlose Steuervorrichtung eines Synchronmotors
US20070125891A1 (en) 2005-12-05 2007-06-07 Crossley Bruce R Refining member clash control method

Also Published As

Publication number Publication date
EP4204625A1 (fr) 2023-07-05
CN116096960A (zh) 2023-05-09
DE102020122645A1 (de) 2022-03-03

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