EP0029905A1 - Dispositif d'alimentation en pâte pour des presses à toiles filtrantes - Google Patents

Dispositif d'alimentation en pâte pour des presses à toiles filtrantes Download PDF

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Publication number
EP0029905A1
EP0029905A1 EP80106294A EP80106294A EP0029905A1 EP 0029905 A1 EP0029905 A1 EP 0029905A1 EP 80106294 A EP80106294 A EP 80106294A EP 80106294 A EP80106294 A EP 80106294A EP 0029905 A1 EP0029905 A1 EP 0029905A1
Authority
EP
European Patent Office
Prior art keywords
distributor
cross
rear wall
headbox
individual channels
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP80106294A
Other languages
German (de)
English (en)
Inventor
Reinhard Dipl.-Ing. Dr. Pinter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Anstalt fur Stromungsmaschinen Gesmbh
Anstalt fuer Stroemungsmaschinen GmbH
Original Assignee
Anstalt fur Stromungsmaschinen Gesmbh
Anstalt fuer Stroemungsmaschinen 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 Anstalt fur Stromungsmaschinen Gesmbh, Anstalt fuer Stroemungsmaschinen GmbH filed Critical Anstalt fur Stromungsmaschinen Gesmbh
Publication of EP0029905A1 publication Critical patent/EP0029905A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/02—Head boxes of Fourdrinier machines
    • D21F1/024—Details of the feed chamber
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/02—Head boxes of Fourdrinier machines
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/06—Regulating pulp flow
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/06—Indicating or regulating the thickness of the layer; Signal devices

Definitions

  • the invention relates to a headbox for belt presses for dewatering fibrous materials, consisting of inlet channels and subsequent cross-distributor with individual channels leading away thereon, the cross-distributor having a preferably rectangular cross-section tapering in the direction of flow.
  • the headbox serves to feed pulp suspensions to a belt press. It is necessary to apply the suspension so evenly distributed over the entire width of the dewatering machine in order to achieve a uniform density of the material to be dewatered.
  • DE-OS 2 721 304 a cross distributor can be seen in the drawing, which has an approximately rectangular cross section and on one side contains individual channels for the material discharge into the machine. On the other side, the rear wall is arranged so that there is a gradual reduction in cross-section. This guarantees the same discharge pressure and the same quantity across the entire web width.
  • a disadvantage of the above-mentioned designs is that a compromise usually has to be made between the theoretically calculated cross-sectional profile, the simplicity of manufacture and certain inevitable manufacturing inaccuracies. Strictly speaking, the design only applies to a specific throughput or a specific consistency of the substance, whereby deviations from these design data also result in certain deviations in the distribution. If a cross distributor with thin material, i.e. operated with consistencies below about 1%, there is always a turbulent flow and the friction conditions change only slightly with the throughput. It is then possible to achieve an approximately uniform distribution of the suspension only by varying the return at the distributor end.
  • transverse distributors which are operated at higher consistencies about 1 to 4%, as for high consistency headboxes in paper or Kartonma - machines or cellulose pulp and cotton occurs machines.
  • turbulent flow prevails, while plug flow occurs at the high consistency values.
  • Such cross distributors are usually designed for an average of the required consistency and throughput range, while the deviations at the upper and lower end of this range have to be accepted. The greatest possible pressure loss in the branch pipes brings a certain improvement here.
  • the object of the invention was to create a headbox for screen belt presses, which consists of inlet channels and subsequent cross-distributors and with individual channels leading away on them, and ensures a uniform pressure distribution over the entire web width and, moreover, also for different consistencies of the Suspension is suitable.
  • the aim is achieved in that the cross distributor on the side opposite the leading individual channels has an adjustable rear wall holds, which has a parabolic curvature in the longitudinal direction of the transverse distributor, the curvature being variable by actuators.
  • the rear wall is made of elastic material, which is fastened on the inlet side and slidably clamped on the opposite end and the bounding sides are shielded by seals.
  • the special design of the headbox in particular the adjustability of the cross-distributor according to the invention, ensures that the suspension reaches the machine with the same pressure and density of the material to be dewatered. The consequence of this is that the quality of the product is significantly increased.
  • the cross distributor 1 shown in FIG. 1 consists essentially of a tube with a rectangular cross section and is accommodated transversely at the entrance of the machine at the deflection point of the sieve belts.
  • the front wall 2 contains a series of individual channels 3, the openings of which are directed towards the machine entrance.
  • the top and bottom are each closed with a cover plate 4, 5, the adjustable rear wall 6 being inserted on the side facing away from the machine.
  • the rear wall 6 is enclosed in a continuation of the cover plates 4, 5 by a formwork 7.
  • the rear wall 6 is now fastened in such a way that a fixed clamping point 10 is provided at the inlet 8, which has a flange 9.
  • a flange 12 is also provided, to which the return 13 is connected to the material discharge.
  • a number of actuators 14 are arranged, which essentially consist of a spindle 15 and contain a spindle plate 16 at the end.
  • the spindle plate 16 engages in a pan 17 and is mounted so that it moves when adjusting the spindle 15 and with its back can move the pan 17 fastened to the rear wall 6 axially.
  • the casing 7 can be filled with a hydraulic medium and is closed on all sides for this purpose. Through the nozzle 18, the medium can be filled or tapped as required and serves to support the rear wall 6.
  • Pressure gauges 30 indicate the respective pressure in front of the actuator 4, which is corrected by hand.
  • Fig. 2 shows a section of the sliding attachment of the rear wall 6 at the end 11 of the Cross distributor 1.
  • the right end of the casing 7 contains the flange 12 in continuation of the return 13, screws 19 being used for the connection.
  • a sealing collar 20 is also clamped between the casing 7 and the flange 12.
  • the protruding part is loosely bent in such a way that the rear wall 6 can be easily moved in the axial direction and is held by stop 22.
  • the sealing collar 20 is fastened to the rear wall 6 by means of a further screw connection 21.
  • FIG 3 shows how the lateral seal 23 of the rear wall 6 on the upper and lower covers 4, 5 and the casing 7 is formed.
  • the seal 23 which can be designed as a round cord ring and lies in a groove 24, a permanent sealing point is achieved.
  • the rear wall 6 can slide along the casing 7 within certain limits.
  • FIG. 4 shows the cross section of the cross distributor 1.
  • a single channel 2 is fastened at the upper end in the front wall 3, the pressure plates 4 and 5 being guided around to the side, and the pressure measuring device ⁇ 30 located in the cover plate 4.
  • the rear wall 6 is inserted, which can be moved with the help of the actuator 14.
  • the spindle plate 16, which is mounted in its socket 17, is attached to the spindle 15 at the end.
  • the pan 17 is firmly welded to the rear wall 6.
  • the casing 7 is connected, the actuator 14 is fastened to it and the spindle 15 is passed through opening 29.
  • the thread 26 of the spindle 15 is in a housing 25, with the help of a handwheel 27 the axial displacement is accomplished.
  • the casing 7 is sealed by a stuffing box 28.
  • the transverse distributor 1 has an adjustable rear wall which has a parabolic curvature in the longitudinal direction and which can be changed by actuators 14. It is also important that the rear wall 6 is made of an elastic material, such as sheet steel and, depending on the size of the system, has a thickness of 2 to 7 mm. It is attached to the clamping point 10, preferably by welding or similar methods. At the other end is a flexible attachment that also serves as a seal. The rear wall 6 is sealed laterally along the cover plates 4, 5 by further seals 23. The forces acting on the rear wall 6 are taken over by a spindle 15 and are in connection with the actuators 14. In addition, the tight casing 7 contributes to the fact that the supporting forces are absorbed evenly.
  • the cross-distributor With the help of the above-mentioned designs, it is now possible for the cross-distributor to gradually decrease in cross-section along the machine width in accordance with the requirements and can also be varied. It only requires the adjustment of the spindles 15 and thus the rear wall 6 can be moved so that it always meets the requirements of the pressure distribution. This deviation of the rear wall from a straight line can influence the particular consistency and the respective pressure of the material to be dewatered.
  • the system can be controlled by the sensors 38 themselves, which enter the determined values into the controllers 32 and pass them on to the actuating pistons 33. This automatically ensures the previously desired pressure curve along the cross distributor 1.
  • This form of control of the cross distributor 1 is shown in FIG. 6.
  • a computer means of the machine is recorded, the areas g ewichts cross profile 37 at the end.
  • the determined values are recorded by a measuring device 36, ie as soon as a value deviates from the target value, a pulse is passed on to the amplifier 35.

Landscapes

  • Paper (AREA)
  • Filtration Of Liquid (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
EP80106294A 1979-11-29 1980-10-16 Dispositif d'alimentation en pâte pour des presses à toiles filtrantes Withdrawn EP0029905A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT7554/79 1979-11-29
AT755479A ATA755479A (de) 1979-11-29 1979-11-29 Stoffauflauf fuer siebbandpressen

Publications (1)

Publication Number Publication Date
EP0029905A1 true EP0029905A1 (fr) 1981-06-10

Family

ID=3597216

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80106294A Withdrawn EP0029905A1 (fr) 1979-11-29 1980-10-16 Dispositif d'alimentation en pâte pour des presses à toiles filtrantes

Country Status (7)

Country Link
EP (1) EP0029905A1 (fr)
JP (1) JPS5680399A (fr)
AT (1) ATA755479A (fr)
BR (1) BR8006804A (fr)
DD (1) DD154621A5 (fr)
FI (1) FI803488L (fr)
YU (1) YU298080A (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3441612A1 (de) * 1984-11-14 1985-11-21 Sulzer-Escher Wyss GmbH, 7980 Ravensburg Stoffauflauf fuer entwaesserungsmaschinen
WO1986001844A1 (fr) * 1984-09-19 1986-03-27 Sulzer-Escher Wyss Gmbh Systeme de caisse de tete pour machine a papier, et procede pour son utilisation
WO1998014659A1 (fr) * 1996-10-03 1998-04-09 Beloit Technologies, Inc. Caisson de distribution parabolique a bords plats
DE102008056505A1 (de) 2008-11-08 2010-05-12 Voith Patent Gmbh Konstantteil
DE102008058414A1 (de) 2008-11-21 2010-05-27 Voith Patent Gmbh Konstantteil mit Entkopplung
DE102008058415A1 (de) 2008-11-21 2010-05-27 Voith Patent Gmbh Konstantteil einer Papiermaschine
DE102008061970A1 (de) 2008-12-12 2010-06-17 Voith Patent Gmbh Konstantteil-Sortierung
DE102009055234A1 (de) 2009-12-23 2011-06-30 Voith Patent GmbH, 89522 Querverteilereinrichtung zur Kopplung mit einem Stoffauflauf und Stoffauflauf
DE102011083176A1 (de) 2011-09-22 2013-03-28 Voith Patent Gmbh Querverteilvorrichtung zur Kopplung mit einem Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn
DE102012203379A1 (de) 2012-03-05 2013-09-05 Voith Patent Gmbh Konstantteil
CN104120616A (zh) * 2014-07-25 2014-10-29 陕西科技大学 免回流可微调方锥总管

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6308909B2 (ja) * 2014-08-11 2018-04-11 株式会社ビーエス 抄造機

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4030971A (en) * 1974-12-13 1977-06-21 Beloit Corporation System compensating for pressure fluctuations in a paper machine headbox

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4030971A (en) * 1974-12-13 1977-06-21 Beloit Corporation System compensating for pressure fluctuations in a paper machine headbox

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1986001844A1 (fr) * 1984-09-19 1986-03-27 Sulzer-Escher Wyss Gmbh Systeme de caisse de tete pour machine a papier, et procede pour son utilisation
DE3514554A1 (de) * 1984-09-19 1986-03-27 Sulzer-Escher Wyss GmbH, 7980 Ravensburg Stoffauflauf-vorrichtung fuer eine papiermaschine und verfahren zu deren betrieb
US4898643A (en) * 1984-09-19 1990-02-06 Sulzer-Escher Wyss Gmbh Headbox control apparatus for a papermaking machine
DE3514554C2 (de) * 1984-09-19 1994-06-16 Escher Wyss Gmbh Stoffauflauf-Vorrichtung für eine Papiermaschine und Verfahren zu deren Betrieb
DE3514554C3 (de) * 1984-09-19 1998-01-08 Escher Wyss Gmbh Stoffauflauf-Vorrichtung für eine Papiermaschine und Verfahren zu deren Betrieb
DE3441612A1 (de) * 1984-11-14 1985-11-21 Sulzer-Escher Wyss GmbH, 7980 Ravensburg Stoffauflauf fuer entwaesserungsmaschinen
WO1998014659A1 (fr) * 1996-10-03 1998-04-09 Beloit Technologies, Inc. Caisson de distribution parabolique a bords plats
US5888353A (en) * 1996-10-03 1999-03-30 Beloit Technologies, Inc. Flatsided parabolic header for headboxes
DE102008056505A1 (de) 2008-11-08 2010-05-12 Voith Patent Gmbh Konstantteil
DE102008058414A1 (de) 2008-11-21 2010-05-27 Voith Patent Gmbh Konstantteil mit Entkopplung
DE102008058415A1 (de) 2008-11-21 2010-05-27 Voith Patent Gmbh Konstantteil einer Papiermaschine
DE102008061970A1 (de) 2008-12-12 2010-06-17 Voith Patent Gmbh Konstantteil-Sortierung
US8313618B2 (en) 2008-12-12 2012-11-20 Voith Patent Gmbh Screening in an approach flow system
DE102009055234A1 (de) 2009-12-23 2011-06-30 Voith Patent GmbH, 89522 Querverteilereinrichtung zur Kopplung mit einem Stoffauflauf und Stoffauflauf
DE102011083176A1 (de) 2011-09-22 2013-03-28 Voith Patent Gmbh Querverteilvorrichtung zur Kopplung mit einem Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn
DE102012203379A1 (de) 2012-03-05 2013-09-05 Voith Patent Gmbh Konstantteil
WO2013131699A1 (fr) 2012-03-05 2013-09-12 Voith Patent Gmbh Circuit de tête d'une machine de fabrication d'une bande de matière fibreuse
CN104120616A (zh) * 2014-07-25 2014-10-29 陕西科技大学 免回流可微调方锥总管
CN104120616B (zh) * 2014-07-25 2016-05-18 陕西科技大学 免回流可微调方锥总管

Also Published As

Publication number Publication date
FI803488L (fi) 1981-05-30
ATA755479A (de) 1981-08-15
BR8006804A (pt) 1981-06-09
YU298080A (en) 1983-02-28
JPS5680399A (en) 1981-07-01
DD154621A5 (de) 1982-04-07

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19810103

AK Designated contracting states

Designated state(s): CH DE FR GB IT SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19820213

RIN1 Information on inventor provided before grant (corrected)

Inventor name: PINTER, REINHARD, DIPL.-ING. DR.