EP3302952B1 - Extrudeuse à vis sans fin - Google Patents

Extrudeuse à vis sans fin Download PDF

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Publication number
EP3302952B1
EP3302952B1 EP16715500.1A EP16715500A EP3302952B1 EP 3302952 B1 EP3302952 B1 EP 3302952B1 EP 16715500 A EP16715500 A EP 16715500A EP 3302952 B1 EP3302952 B1 EP 3302952B1
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EP
European Patent Office
Prior art keywords
screw
apertures
press according
screw press
helix
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.)
Active
Application number
EP16715500.1A
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German (de)
English (en)
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EP3302952A1 (fr
Inventor
Torbjorn HAUGER
Terje BREINES
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.)
Voith Patent GmbH
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Voith Patent GmbH
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Publication of EP3302952A1 publication Critical patent/EP3302952A1/fr
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Publication of EP3302952B1 publication Critical patent/EP3302952B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/12—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing
    • B30B9/121—Screw constructions

Definitions

  • the invention relates to a screw press for separating liquids from a suspension, in particular a sludge or pulp suspension with a conical or cylindrical and perforated jacket mounted in a housing and at least one cylindrical or conical screw shaft rotating in the jacket with at least one screw helix, whereby the suspension is pressed from an inlet to an outlet opening through an annular gap formed between the jacket and the screw shaft.
  • dewatering devices have been known for a long time and are used with success in particular for thickening fiber suspensions in machines for producing a fiber web.
  • a driven screw conveyor is arranged within an essentially concentrically cylindrical or conical, perforated sheet metal jacket or the like.
  • the radially added suspension is dewatered in cooperation with a damming device, the water being able to escape through the perforated sheet metal jacket or the like, while the rejects are retained.
  • the compression and drainage of the reject is improved if a conical shape is chosen for the sheet metal jacket, the diameter of which decreases in the reject running direction, whereby the outer screw diameter can of course also be adapted to these geometrical relationships.
  • the known drainage screws are designed as described, they are exposed to particularly high levels of wear as a result of the intense friction between the reject and the components of the machine. There is a considerable relative movement with enormous axial and radial forces at the same time between the already heavily thickened material and the components.
  • the perforation of the jacket can become clogged relatively easily, especially in the inlet area, which greatly impairs drainage. Therefore, an even distribution of the suspension is important there to ensure effective pre-drainage.
  • the object of the invention is therefore to improve the efficiency of the drainage with the least possible wear.
  • At least one worm screw has at least one axially extending opening. Differences in pressure in the suspension can be balanced out axially along the screw shaft via the openings, so that the screw press is evenly loaded at the inlet.
  • At least one worm helix has several axial openings.
  • each turn of the screw spiral has at least one, preferably several, axial openings.
  • At least one, preferably several, in particular all axial openings should have a circular or an elongated, preferably oval cross-section. This enables a large open area of the screw spiral with sufficient stability.
  • the worm helix is designed as a double helix. This means that the worm shaft carries two worm helixes running around one another.
  • At least one, preferably several, in particular all of the axial openings can be designed as recesses that are radially outwardly open. This leads to a loosening of the material in the sieve area and thus increases the dewatering performance.
  • the perforation in the area of the inlet opening often tends to become blocked at high pressures at the inlet.
  • the axial openings are therefore predominantly, preferably exclusively, arranged in the half of the worm shaft facing the inlet opening.
  • the risk of backflows against the conveying direction increases.
  • the openings should also only be present in an axially relatively limited area, which is preferably outside the area of the inlet opening, in particular begins immediately after the inlet opening in the conveying direction.
  • the axial openings are only present in an area which extends axially over a maximum of 1/3, in particular a maximum of 1 ⁇ 4 of the worm shaft and / or which extends axially over a maximum of 1.2 m, in particular a maximum of 1 m of the worm shaft (3) extends and / or the screw spiral has a maximum of 8, preferably a maximum of 5 openings.
  • a backflow counter to the conveying direction is effectively countered in that the cross-sectional area of the openings in the conveying direction tends to decrease, preferably from opening to opening.
  • At least some of the, preferably all, openings should extend to the worm shaft.
  • the distance between two adjacent, axial openings is approximately the same in the circumferential direction.
  • the screw press shown is used for dewatering a pulp suspension formed at least partially from waste paper, as is required for the production of a fibrous web.
  • the screw press has a screw shaft 3 arranged concentrically and rotatably mounted in a cylindrical shell 2, the suspension from the screw spirals 4 of the screw shaft 3 through an annular gap 5 formed between the shell 2 and the screw shaft 3 from at least one inlet 7 to one Outlet opening 8 is pressed.
  • the suspension As it passes through the annular gap 5, the suspension is dewatered both by gravity and by compression taking place during transport.
  • the water runs through the sieve openings of the jacket 2 into a drainage box with an outlet 9.
  • This drainage box collects the collected water and is integrated here, for example, into the housing 1 surrounding the jacket 2.
  • the screw shaft 3 and / or the jacket 2 can be designed and arranged conically in such a way that the annular gap 5 gradually decreases in size in the conveying direction 10.
  • the thickened suspension After passing through the annular gap 5, the thickened suspension reaches the area of the outlet opening 8.
  • the worm shaft 3 is driven by a motor 11, it being possible for a gear, a belt or the like to be connected in between.
  • the construction is particularly simple if, as shown here, the cylinder axis 12 of the jacket 2 runs horizontally.
  • the perforation of the jacket 2 can become clogged, which significantly impairs the drainage performance.
  • the worm helix 4 therefore has a plurality of axially extending openings 6.
  • openings 6 allow axial pressure equalization within the Suspension and thus counteract local overloads.
  • these axial openings 6 are oval with a longitudinal extension in the circumferential direction of the helical screw 4 formed, which reduces the loading capacity of the helical screw 4 only relatively slightly and yet allows a large open area for the helical screw 4.
  • the axial and here circular openings 6 are at Figure 1 also arranged only in the half of the screw shaft 3 facing the inlet opening 7.
  • the area with the openings 6 directly adjoins the inlet opening 7 in the conveying direction 10 and extends over a relatively short, axial section of the screw shaft 3, which is shorter than 1 ⁇ 4 of the total length of the screw shaft 3, in particular shorter than 1 m.
  • the screw helix 4 is designed as a double helix in this example. Of the two coils of the screw coil 4 that run around one another, only one coil has axial openings 6.
  • the cross-sectional area of the openings 6 in the conveying direction 10 from opening 6 to opening 6 becomes smaller.
  • the openings 6 extend to the worm shaft 3, which can have a positive effect on the stability of the worm helix 4.
  • the distance between two adjacent, axial openings 6 in the circumferential direction is approximately the same size, whereby it is usually sufficient if the helix 4 has a total of only 5 openings 6.
  • the openings 6 are at Figure 2 35 to 65% of the cross-sectional area of the screw spiral 4 running perpendicular to the screw shaft 3 in relation to the section of the screw spiral 4 having openings 6 is perforated.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Sludge (AREA)
  • Paper (AREA)

Claims (14)

  1. Extrudeuse à vis sans fin pour la séparation de liquides à partir d'une suspension, notamment d'une suspension de boue ou de matière fibreuse, comprenant une enveloppe (2) conique ou cylindrique et perforée, montée dans un carter (1), et au moins un arbre de vis sans fin (3) cylindrique ou conique, en rotation dans l'enveloppe (2), muni d'au moins une hélice de vis sans fin (4), la suspension étant extrudée d'une ouverture d'entrée (7) jusqu'à une ouverture de sortie (8) à travers un interstice annulaire (5) formé entre l'enveloppe (2) et l'arbre de vis sans fin (3), au moins une hélice de vis sans fin (4) possédant plusieurs percées (6) qui s'étendent axialement, les percées axiales (6) étant majoritairement agencées dans la moitié de l'arbre de vis sans fin (3) orientée vers l'ouverture d'entrée (7), caractérisée en ce que la surface de section transversale des percées (6) diminue dans la direction de transport (10).
  2. Extrudeuse à vis sans fin selon la revendication 1, caractérisée en ce que chaque spire de l'hélice de vis sans fin (4) possède au moins une, de préférence plusieurs percées axiales (6).
  3. Extrudeuse à vis sans fin selon l'une quelconque des revendications précédentes, caractérisée en ce qu'au moins une, de préférence plusieurs, notamment toutes les percées axiales (6) présentent une section transversale circulaire ou allongée, de préférence ovale.
  4. Extrudeuse à vis sans fin selon l'une quelconque des revendications précédentes, caractérisée en ce que l'hélice de vis sans fin (4) n'est pas configurée sous la forme d'une hélice double dans la zone des percées (6) .
  5. Extrudeuse à vis sans fin selon l'une quelconque des revendications précédentes, caractérisée en ce qu'au moins une, de préférence plusieurs, notamment toutes les percées axiales (6) sont configurées sous la forme d'évidements ouverts radialement vers l'extérieur.
  6. Extrudeuse à vis sans fin selon l'une quelconque des revendications précédentes, caractérisée en ce que 25 à 75 %, notamment 35 à 65 %, de la surface de section transversale, s'étendant perpendiculairement à l'arbre de vis sans fin (3), de la zone de l'hélice de vis sans fin (4) comprenant des percées (6) est percée.
  7. Extrudeuse à vis sans fin selon l'une quelconque des revendications précédentes, caractérisée en ce que les percées axiales (6) sont agencées exclusivement dans la moitié de l'arbre de vis sans fin (3) orientée vers l'ouverture d'entrée (7).
  8. Extrudeuse à vis sans fin selon l'une quelconque des revendications précédentes, caractérisée en ce que les percées axiales (6) sont présentes uniquement dans une zone qui s'étend axialement au plus sur 1/3, notamment au plus sur ¼ de l'arbre de vis sans fin (3), et débute de préférence directement après l'ouverture d'entrée dans la direction de transport.
  9. Extrudeuse à vis sans fin selon l'une quelconque des revendications précédentes, caractérisée en ce que les percées axiales (6) sont présentes uniquement dans une zone qui s'étend axialement au plus sur 1,2 m, notamment au plus sur 1 m de l'arbre de vis sans fin (3) .
  10. Extrudeuse à vis sans fin selon l'une quelconque des revendications précédentes, caractérisée en ce qu'aucune percée (6) n'est présente dans la zone de l'ouverture d'entrée (7).
  11. Extrudeuse à vis sans fin selon l'une quelconque des revendications précédentes, caractérisée en ce que l'hélice de vis sans fin (4) possède au plus 8, de préférence au plus 5 percées (6).
  12. Extrudeuse à vis sans fin selon l'une quelconque des revendications précédentes, caractérisée en ce qu'au moins une partie des, de préférence toutes les percées (6) s'étendent jusqu'à l'arbre de vis sans fin (3) .
  13. Extrudeuse à vis sans fin selon l'une quelconque des revendications précédentes, caractérisée en ce que la surface de section transversale des percées (6) diminue de percée (6) en percée (6) dans la direction de transport (10).
  14. Extrudeuse à vis sans fin selon l'une quelconque des revendications précédentes, caractérisée en ce que l'écart entre deux percées axiales voisines (6) est approximativement identique à chaque fois dans la direction circonférentielle.
EP16715500.1A 2015-06-03 2016-04-07 Extrudeuse à vis sans fin Active EP3302952B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015210265.3A DE102015210265A1 (de) 2015-06-03 2015-06-03 Schneckenpresse
PCT/EP2016/057564 WO2016192873A1 (fr) 2015-06-03 2016-04-07 Extrudeuse à vis sans fin

Publications (2)

Publication Number Publication Date
EP3302952A1 EP3302952A1 (fr) 2018-04-11
EP3302952B1 true EP3302952B1 (fr) 2021-11-03

Family

ID=55701947

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16715500.1A Active EP3302952B1 (fr) 2015-06-03 2016-04-07 Extrudeuse à vis sans fin

Country Status (3)

Country Link
EP (1) EP3302952B1 (fr)
DE (1) DE102015210265A1 (fr)
WO (1) WO2016192873A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021126120B4 (de) * 2021-10-08 2024-10-24 Voith Patent Gmbh Schneckenpresse

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4152179B2 (ja) * 2002-12-06 2008-09-17 株式会社クボタ スクリュープレスおよび脱水方法
DE10315587A1 (de) * 2003-04-05 2004-10-14 Fan Separator Gmbh Mischschnecke für Schneckenpresse
DE102006002016A1 (de) * 2006-01-13 2007-07-19 Andreas Kufferath Gmbh & Co. Kg Schneckenwelle für eine Schneckenpresse
DE202006000583U1 (de) * 2006-01-13 2006-04-13 Andreas Kufferath Gmbh & Co Kg Schneckenwelle für eine Schneckenpresse
ITBO20070342A1 (it) * 2007-05-10 2008-11-11 Babbini S P A Pressa per disidratazione meccanica
NL2008502C2 (nl) * 2012-03-19 2013-09-23 Smicon B V Schroefpers.

Also Published As

Publication number Publication date
WO2016192873A1 (fr) 2016-12-08
DE102015210265A1 (de) 2016-12-08
EP3302952A1 (fr) 2018-04-11

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