EP0672519B1 - Screw-press for dewatering suspensions - Google Patents

Screw-press for dewatering suspensions Download PDF

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Publication number
EP0672519B1
EP0672519B1 EP95103576A EP95103576A EP0672519B1 EP 0672519 B1 EP0672519 B1 EP 0672519B1 EP 95103576 A EP95103576 A EP 95103576A EP 95103576 A EP95103576 A EP 95103576A EP 0672519 B1 EP0672519 B1 EP 0672519B1
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EP
European Patent Office
Prior art keywords
perforated basket
screw
press according
pressing zone
screw press
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.)
Expired - Lifetime
Application number
EP95103576A
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German (de)
French (fr)
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EP0672519A1 (en
Inventor
Uwe Dr. Krieger
Karl-Heinz Janus
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Andreas Kufferath GmbH and Co KG
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Andreas Kufferath GmbH and Co KG
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Publication of EP0672519A1 publication Critical patent/EP0672519A1/en
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    • 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
    • B30B9/125—Control arrangements
    • 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
    • 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
    • B30B9/18—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 with means for adjusting the outlet for the solid
    • 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
    • B30B9/26—Permeable casings or strainers

Definitions

  • the invention relates to a screw press for dewatering suspensions in Continuous operation with a rotatable, suspension-promoting Worm shaft, with a sheath, which is the worm of the worm shaft and a this flow-downstream, screwless press zone variable throttling surrounds, with a serving for suspensions to be dewatered Inlet at an inlet-side press end and with one for dewatered Suspensions serving the flow downstream of the pressing zone at the other end of the press, with the jacket in the area of the screw shaft as a liquid-permeable, solid-impermeable screen basket designed and in the area the press zone to change its effective press zone length depending on the operation is axially displaceable,
  • the pressing zone has active Throttle elements on.
  • the Sheath displacement is used only for a corresponding pressure-compensating change in size the outlet gap between the active throttle elements.
  • Screw presses are known in various designs and are used for drainage of various suspensions (rejects, capture materials, sludges, fiber materials) used.
  • the suspension to be dewatered is fed through a filling shaft (Inlet) placed on a rotating screw and from this towards one Press exit (discharge) promoted.
  • Inlet Inlet
  • Press exit discharge
  • throttling takes place so that the screw build up pressure in the suspension must to overcome the resistance of this throttling.
  • the pressure build-up causes the suspension to be dewatered.
  • Some screw presses are throttled by active (controllable / regulatable) Elements.
  • the active elements are mechanical, pneumatic or hydraulic actuated plates, cones or fins used, the pressure at which the exit is released, depending on other parameters (type of Suspension, final dry matter content) can be adjusted.
  • the present invention is therefore based on the task of a screw press of the kind mentioned in the preamble with simple measures that they avoid the disadvantages described with a high drainage efficiency a good adaptation of the throttle effect to the respective operating requirements as well as easy emptying and cleaning of the screw press.
  • the measures relating to the size of the displaceability of the screen basket Claims 2 to 4 meet the usual operational requirements and necessary throttling effects of the press zone.
  • claim 5 enables a particularly precise, continuous Adapting the length of the press zone to the respective operating requirements. In many applications, however, the gradual displaceability is sufficient according to claim 6.
  • claims 7 and 8 can be achieved with simple measures, that when changing the length of the pressing zone the inlet side strainer section can remain unchanged. Also the total length of the screw press can remain unchanged, which would not be the case if the entire screen basket can be moved would.
  • claims 9 to 11 are extremely advantageous because this can be achieved in an automatic manner that the length of the press zone is always optimally adapted to the respective operating conditions. If the drive power - or the torque - and / or the axial force increases too much this is an indication that the length of the press zone by moving the outlet side Sieve basket section must be reduced (for example, due to a impending blockage), so that the axial forces do not become too great. If, on the other hand, the drive power becomes too low, this is an indication that that the length of the press zone by moving the downstream strainer section must be increased so that adequate drainage takes place. Due to the variable suspension properties, variable ones occur during operation Drive power by means of which the press zone length can be optimized in a time-variable manner is. And finally, by moving back the screen basket or screen basket section in the zero position an effective press emptying or self-cleaning guaranteed.
  • the measure of claim 12 enables a very simple device technology Training by operating an adjusting device in one direction or the other depending on whether the actual value exceeds or falls below the setpoint.
  • a suitable drive according to claims 17 to 19 provided for adjusting the strainer basket section on the outlet side, so that the adjustment the press zone can be done automatically without manual intervention.
  • the inside of the press zone could be completely empty.
  • a screw press 10 has a screw shaft 12 which is in its left or area on the inlet side carries a worm 14.
  • the worm shaft 12 is in bearings 16 and 18 rotatably mounted and connected to an electric motor drive 30.
  • the screw press 10 has at the inlet end region of the screw shaft 12 an inlet 20 on the top for dewatered to be fed in the direction of arrow A. Suspensions on.
  • a liquid outlet 24 is provided in the deepest area of the screw press 10, from which the liquid removed from the suspension in the direction of arrow C. can run down.
  • the worm shaft 12 and its worm 14 are concentric of one Sheathed coat or strainer basket surrounded by an annular channel for the to draining suspension limited from the outside.
  • This strainer coat or strainer basket retains the solid components of the suspension and is permeable to liquids.
  • it consists of a stationary inlet basket section on the inlet side 32 and one on this longitudinally displaceable, concentric outlet side Sieve basket section 34. The latter more or less encloses one screwless press zone 28 of the worm shaft 12.
  • the throttling effect of the press zone 28 is the larger, the further the drain-side screen basket section 34 to the right is moved.
  • the drain-side screen basket section 34 is provided with one for axial displacement Drive 36 connected, in the present case as a hydraulic piston-cylinder unit is trained. This is with the motor rotary drive 30 via a control element 38 of a control loop connected, for example, the current motor drive power received as an input signal.
  • a predetermined setpoint increases or decreases, the drain-side screen basket section 34 shifted to the left or to the right to reduce the throttling effect the press zone 28 with the aim of a constant drainage result as well as lowering or increasing machine protection.
  • the control member 38 can drive the movable screen basket section 34 - for example when parking the press - down to a zero position (in the drawing to the left) in which complete press emptying is no problem can be done.
  • the control element 38 can also ensure that this zero position for Purposes of self-cleaning and thus to avoid constipation is started up during the press operation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Filtration Of Liquid (AREA)
  • Treatment Of Sludge (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Description

Die Erfindung betrifft eine Schneckenpresse zum Entwässern von Suspensionen in Durchlaufbetriebsweise mit einer drehbar antreibbaren, suspensionsfördernden Schneckenwelle, mit einem Mantel, der die Schnecke der Schneckenwelle und eine dieser strömungsmäßig nachgeschaltete, schneckenlos ausgebildete Preßzone mit veränderbarer Drosselung umgibt, mit einem für zu entwässernde Suspensionen dienenden Zulauf an einem einlaßseitigen Pressenende und mit einem für entwässerte Suspensionen dienenden, der Preßzone strömungsmäßig nachgeschalteten Ablauf am anderen Pressenende, wobei der Mantel im Bereich der Schneckenwelle als flüssigkeitsdurchlässiger, feststoffundurchlässiger Siebkorb ausgebildet und im Bereich der Preßzone zur Veränderung ihrer wirksamen Preßzonenlänge betriebsabhängig axial verschiebbar ist,The invention relates to a screw press for dewatering suspensions in Continuous operation with a rotatable, suspension-promoting Worm shaft, with a sheath, which is the worm of the worm shaft and a this flow-downstream, screwless press zone variable throttling surrounds, with a serving for suspensions to be dewatered Inlet at an inlet-side press end and with one for dewatered Suspensions serving the flow downstream of the pressing zone at the other end of the press, with the jacket in the area of the screw shaft as a liquid-permeable, solid-impermeable screen basket designed and in the area the press zone to change its effective press zone length depending on the operation is axially displaceable,

Bei einer derartigen Schneckenpresse gemäß der GB-A-1170315 weist die Preßzone aktive Drosselelemente auf. In diesem Zusammenhang sind ein endseitiger Konus der Preßzone und der im Bereich der Preßzone ungelochte, bewegliche Mantel relativ zueinander beweglich, so daß dazwischen ein größenvariabler Austrittsspalt entsteht. Bei steigendem Preßdruck erfolgen ein geringfügiges Verdrehen und dadurch ein ventilgesteuertes, lineares, geringfügiges Ausweichen bzw. Verschieben des Mantels mittels eines Druckmittels bis zu einem Gleichgewicht, wobei der Austrittsspalt druckentlastend vergrößert wird. Die Mantelverschiebung dient ausschließlich einer entsprechend druckausgleichenden Größenveränderung des Austrittsspalts zwischen den aktiven Drosselelementen.In such a screw press according to GB-A-1170315, the pressing zone has active Throttle elements on. In this context, there is an end cone of the press zone and the non-perforated, movable jacket relative to one another in the region of the pressing zone movable, so that there is a variable exit gap between them. With increasing There is a slight twisting and thus a valve-controlled, linear, slight evasion or displacement of the jacket by means of a pressure medium to an equilibrium, with the outlet gap being increased to relieve pressure. The Sheath displacement is used only for a corresponding pressure-compensating change in size the outlet gap between the active throttle elements.

Schneckenpressen sind in verschiedenen Bauformen bekannt und werden zur Entwässerung von diversen Suspensionen (Rejekte, Fangstoffe, Schlämme, Faserstoffe) eingesetzt. Die zu entwässernde Suspension wird dabei über einen Einfüllschacht (Zulauf) auf eine rotierende Schnecke gegeben und von dieser in Richtung zu einem Pressenausgang (Ablauf) gefördert. In der Presse findet in einer sogenannten Preßzone eine Drosselung statt, so daß die Schnecke in der Suspension einen Druck aufbauen muß, um den Widerstand dieser Drosselung zu überwinden. Der Druckaufbau bewirkt, daß die Suspension entwässert wird.Screw presses are known in various designs and are used for drainage of various suspensions (rejects, capture materials, sludges, fiber materials) used. The suspension to be dewatered is fed through a filling shaft (Inlet) placed on a rotating screw and from this towards one Press exit (discharge) promoted. In the press takes place in a so-called press zone throttling takes place so that the screw build up pressure in the suspension must to overcome the resistance of this throttling. The pressure build-up causes the suspension to be dewatered.

Die Drosselung erfolgt bei einigen Schneckenpressen durch aktive (steuerbare / regelbare) Elemente. Als aktive Elemente werden mechanisch, pneumatisch oder hydraulisch betätigte Platten, Konen oder Lamellen eingesetzt, wobei der Druck, bei dem der Austritt freigegeben wird, in Abhängigkeit von anderen Parametern (Art der Suspension, Endtrockengehalt) eingestellt werden kann.Some screw presses are throttled by active (controllable / regulatable) Elements. The active elements are mechanical, pneumatic or hydraulic actuated plates, cones or fins used, the pressure at which the exit is released, depending on other parameters (type of Suspension, final dry matter content) can be adjusted.

Als weiteres Drosselmedium (passive Drosselung) ist es bei einer anderen Schneckenpresse mit einer von einem Siebkorb (Seihemantel) umgebenen Schnecke bekannt, einen sich an das Ende der Schnecke anschließenden, ebenfalls von dem Siebkorb (Selhemantel) umgebenen, jedoch wendel- bzw. schneckenlosen Preßzonen - Bereich vor dem Ablauf einzusetzen. Dieser Preßzonen - Bereich hat folgende Wirkungen:

  • a) Durch die Reibung des Stoffes an Siebkorb und Schneckenwelle wird der Preßdruck erhöht (Bremsschnecke).
  • b) Die Aufenthaltszeit in der Hochdruckzone wird verlängert; damit wird der Endtrockengehalt erhöht.
    • As another throttling medium (passive throttling), it is known in another screw press with a screw surrounded by a sieve basket (sieve sheath), a pressing zone which adjoins the end of the screw and is also surrounded by the sieve basket (selhemantel) but is helical or screwless - Use area before expiration. This press zone area has the following effects:
  • a) Due to the friction of the material on the screen basket and worm shaft, the pressure is increased (brake worm).
  • b) The stay in the high pressure zone is extended; this increases the final dry content.

    • Die Länge der Preßzone ist wesentlich für das Betriebsverhalten einer Schneckenpresse (Antriebsleistung, Endtrockengehalt). Sie ergibt sich bei bekannterweise fester Siebkorblänge aus der Anzahl der Schneckenwendeln auf der Schneckenwelle und wird nach Erfahrung oder bei der Inbetriebnahme festgelegt. Die Länge der Preßzone ist hierbei im Betrieb nicht veränderlich. Daraus ergeben sich folgende wesentliche Nachteile:

  • a) Die Drosselwirkung bzw. der Druckverlust in der Preßzone ist abhängig vom Charakter der Suspension (Reibungsverhalten, Scherfestigkeit) und kann nicht beeinflußt werden. Bei wechselndem Suspensionsverhalten kann dies zu Betriebsproblemen führen. Sind die Reibungsverluste zu hoch, können Antriebsleistung und Axialkraft über das zulässige Maß steigen. Ist die Reibung zu gering, kann die Länge der Preßzone für einen ausreichenden Druckaufbau eventuell nicht ausreichen. Damit wird kein ausreichender Trockengehalt erreicht. Die Erfahrungen haben gezeigt, daß die Kompensation einer zu kurzen Preßzone durch ein aktives Drosselorgan nur bedingt möglich ist.
  • b) Beim Abstellen der Schneckenpresse kann die Preßzone nicht entleert werden. Die Suspension kann eintrocknen, so daß beim Wiederanfahren unzulässig hohe Belastungen (Drehmoment, Axialkraft) auftreten können.
  • c) Die meisten Schlämme müssen vor Aufgabe auf eine Schneckenpresse konditioniert (geflockt) werden. Sollte auch nur für kurze Zelt ungeflockter Schlamm in die Presse gelangen, so kann dieser Schlamm den in der Preßzone befindlichen Schlammpfropfen nicht mehr herausdrücken. Die Schneckenpresse "verstopft".
  • d) in Abhängigkeit vom Entwässerungsverhalten und der Scherfestigkeit der Suspension können sich in der Preßzone direkt am Siebkorb dünne und relativ trockene und wasserundurchlässige Schichten ausbilden, über die die feuchtere Suspension hinweggleitet. Die Funktion der Presse kann wesentlich beeinträchtigt werden. Ein Entfernen dieser Schichten ist nur mit großem Aufwand möglich.
    • The length of the press zone is essential for the operating behavior of a screw press (drive power, final dryness). If the screen basket length is known to be fixed, it results from the number of screw spirals on the screw shaft and is determined based on experience or during commissioning. The length of the press zone cannot be changed during operation. This has the following major disadvantages:
  • a) The throttling effect or the pressure loss in the press zone depends on the character of the suspension (friction behavior, shear strength) and cannot be influenced. If the suspension behavior changes, this can lead to operating problems. If the friction losses are too high, the drive power and axial force can rise above the permissible level. If the friction is too low, the length of the press zone may not be sufficient to build up sufficient pressure. Adequate dryness is not achieved. Experience has shown that the compensation of a press zone that is too short is only possible to a limited extent by an active throttle element.
  • b) When the screw press is switched off, the press zone cannot be emptied. The suspension can dry out, so that impermissibly high loads (torque, axial force) can occur when restarting.
  • c) Most sludges must be conditioned (flocculated) on a screw press before feeding. If unblocked sludge gets into the press even for a short time, this sludge can no longer push out the sludge plug in the pressing zone. The screw press "clogged".
  • d) depending on the drainage behavior and the shear strength of the suspension, thin and relatively dry and water-impermeable layers can form in the pressing zone directly on the screen basket, over which the wetter suspension slides. The function of the press can be significantly affected. These layers can only be removed with great effort.

    • Der vorliegenden Erfindung liegt deshalb die Aufgabe zugrunde, eine Schneckenpresse der im Oberbegriff genannten Art mit einfachen Maßnahmen so auszubilden, daß sie unter Vermeidung der geschilderten Nachteile bei großem Entwässerungswirkungsgrad eine gute Anpassung der Drosselwirkung an die jeweiligen Betriebserfordernisse sowie ein leichtes Entleeren und Reinigen der Schneckenpresse ermöglicht.The present invention is therefore based on the task of a screw press of the kind mentioned in the preamble with simple measures that they avoid the disadvantages described with a high drainage efficiency a good adaptation of the throttle effect to the respective operating requirements as well as easy emptying and cleaning of the screw press.

    Zur Lösung der gestellten Aufgabe zeichnet sich eine Schneckenpresse der im Oberbegriff genannten Art erfindungsgemäß durch die im Kennzeichen von Anspruch 1 genannten Merkmale aus.To solve the task, a screw press stands out in the preamble mentioned type according to the invention by the in the characterizing part of claim 1 mentioned features.

    Durch die erfindungsgemäßen Maßnahmen des auch im Bereich der Preßzone als Siebkorb ausgebildeten axial verschiebbaren Mantels und der von aktiven Drosselelementen freien Ausbildung der Preßzone kann die Drosselwirkung der hochwirksamen Preßzone in einfacher Weise, und zwar ohne große Pressenänderungen, schnell den erforderlichen Betriebsbedingungen angepaßt werden. Außerdem ergibt sich ein sehr einfacher Preßzonenaufbau, dessen Drosselung allein durch Verschieben des in diesem Bereich befindlichen Siebkorbes einstellbar ist. Die erwähnten Betriebsbedingungen hängen von dem Charakter der Suspension ab, wie von ihrem Reibungsverhalten und ihrer Scherfestigkeit. Diese Anpassung kann sehr schnell erfolgen. Dadurch sind stets ein optimales Entwässerungsergebnis und ein ausreichender Trockengehalt erzielbar, und zwar auch bei veränderlichen Suspensionseigenschaften. Ferner werden hierdurch die Betriebssicherheit erhöht und die Gefahr von Maschinenschäden infolge Verstopfung vermindert. Außerdem können wegen der Verschiebbarkeit (bis zur Nullposition) die Schneckenpresse leicht vollständig entleert und der Siebkorb in der Preßzone regelmäßig von angelagerten Schichten befreit werden, was beispielsweise für das Entfernen eingetrockneter Suspensionsbestandteile und zum Vermeiden unzulässig hoher Maschinenbelastungen beim Wiederanfahren wichtig ist. By the measures according to the invention also in the area of the press zone Sieve basket formed axially displaceable jacket and that of active throttle elements Free formation of the press zone can reduce the throttling effect of the highly effective Press zone in a simple manner, and without major press changes, can be quickly adapted to the required operating conditions. Also results is a very simple press zone structure, the throttling by shifting alone of the sieve basket located in this area is adjustable. The operating conditions mentioned depend on the character of the suspension as well as on its Friction behavior and their shear strength. This adjustment can be done very quickly. As a result, an optimal drainage result is always sufficient Dryness can be achieved, even with variable suspension properties. This also increases operational safety and the risk of Machine damage due to constipation reduced. In addition, because of the Slidability (to the zero position) the screw press easily completely emptied and the sieve basket in the pressing zone is regularly freed of accumulated layers be what, for example, for the removal of dried suspension components and to avoid impermissibly high machine loads when starting up again important is.

    Die die Größe der Verschiebbarkeit des Siebkorbes betreffenden Maßnahmen der Ansprüche 2 bis 4 genügen den in der Praxis üblichen Betriebserfordernissen und notwendigen Drosselwirkungen der Preßzone.The measures relating to the size of the displaceability of the screen basket Claims 2 to 4 meet the usual operational requirements and necessary throttling effects of the press zone.

    Die weitere Ausgestaltung von Anspruch 5 ermöglicht ein besonders genaues, kontinuierliches Anpassen der Länge der Preßzone an die jeweiligen Betriebserfordernisse. Bei vielen Anwendungsfällen genügt jedoch die stufenweise Verschiebbarkeit gemäß Anspruch 6.The further embodiment of claim 5 enables a particularly precise, continuous Adapting the length of the press zone to the respective operating requirements. In many applications, however, the gradual displaceability is sufficient according to claim 6.

    Durch die Merkmale der Ansprüche 7 und 8 ist mit einfachen Maßnahmen erreichbar, daß beim Verändern der Länge der Preßzone der zulaufseitige Siebkorbabschnitt unverändert bleiben kann. Auch die Gesamtlänge der Schneckenpresse kann unverändert bleiben, was nicht der Fall wäre, wenn der gesamte Siebkorb verschiebbar wäre.The features of claims 7 and 8 can be achieved with simple measures, that when changing the length of the pressing zone the inlet side strainer section can remain unchanged. Also the total length of the screw press can remain unchanged, which would not be the case if the entire screen basket can be moved would.

    Die bevorzugten Merkmale der Ansprüche 9 bis 11 sind äußerst vorteilhaft, weil hierdurch in selbsttätiger Weise erzielt werden kann, daß die Länge der Preßzone stets optimal an die jeweiligen Betriebsverhältnisse angepaßt wird. Wenn die Antriebsleistung - bzw. das Drehmoment - und/oder die Axialkraft zu stark ansteigt, ist dieses ein Hinweis darauf, daß die Länge der Preßzone durch Verschieben des ablaufseitigen Siebkorbabschnitts verkleinert werden muß (beispielsweise aufgrund einer drohenden Verstopfung), damit die auftretenden Axialkräfte nicht zu groß werden. Wenn dagegen die Antriebsleistung zu klein wird, ist dieses ein Hinweis darauf, daß die Länge der Preßzone durch Verschieben des ablaufseitigen Siebkorbabschnitts vergrößert werden muß, damit eine ausreichende Entwässerung stattfindet. Im Betrieb treten aufgrund der veränderlichen Suspensionseigenschaften auch veränderliche Antriebsleistungen auf, mittels derer die Preßzonenlänge zeitvariabel optimierbar ist. Und schließlich ist durch Zurückfahren des Siebkorbs bzw. Siebkorbabschnitts in die Nullposition eine wirksame Pressenentleerung bzw. Selbstreinigung gewährleistet.The preferred features of claims 9 to 11 are extremely advantageous because this can be achieved in an automatic manner that the length of the press zone is always optimally adapted to the respective operating conditions. If the drive power - or the torque - and / or the axial force increases too much this is an indication that the length of the press zone by moving the outlet side Sieve basket section must be reduced (for example, due to a impending blockage), so that the axial forces do not become too great. If, on the other hand, the drive power becomes too low, this is an indication that that the length of the press zone by moving the downstream strainer section must be increased so that adequate drainage takes place. Due to the variable suspension properties, variable ones occur during operation Drive power by means of which the press zone length can be optimized in a time-variable manner is. And finally, by moving back the screen basket or screen basket section in the zero position an effective press emptying or self-cleaning guaranteed.

    Die Maßnahme von Anspruch 12 ermöglicht eine sehr einfache gerätetechnische Ausbildung, indem ein Verstellmittel in der einen oder anderen Richtung betrieben wird, je nachdem, ob der istwert den Sollwert über- oder unterschreitet.The measure of claim 12 enables a very simple device technology Training by operating an adjusting device in one direction or the other depending on whether the actual value exceeds or falls below the setpoint.

    Die Weiterbildung von Anspruch 13 ist bevorzugt, damit sich kein instabiler Betrieb ergibt. Nach jeder schnellen Verlängerung der Preßzone (zum Zweck einer Vergrößerung der Drosselung) entsteht vor den Schneckenwendeln ein Hohlraum, der zu einem Absinken des Drehmoments (Antriebsleistung) bzw. der Axialkraft führt. Falls der Regler nicht ausreichend träge ist, ergibt sich ein instabiles oder falsches Regelverhalten, und die Preßzone würde dabei vorübergehend viel zu stark vergrößert. Der Regelvorgang läßt sich dadurch stabilisieren, daß nach jeder Verlängerung der Preßzone zunächst das Erreichen eines neuen Gleichgewichtszustands abgewartet wird.The development of claim 13 is preferred so that there is no unstable operation results. After each rapid extension of the press zone (for the purpose of enlargement throttling), a cavity is created in front of the screw spirals a decrease in the torque (drive power) or the axial force. If the controller is not sufficiently slow, there is an unstable or incorrect control behavior, and the press zone would be temporarily enlarged too much. The control process can be stabilized in that after each extension of the Press zone first waited for a new equilibrium to be reached becomes.

    Durch die Ausgestaltungen der Ansprüche 14 bis 16 kann eine wirkungsvolle und gezielte Selbstreinigung erreicht werden. Through the configurations of claims 14 to 16, an effective and targeted self-cleaning can be achieved.

    In weiterer Ausgestaltung ist gemäß den Ansprüchen 17 bis 19 ein geeigneter Antrieb zum Verstellen des ablaufseitigen Siebkorbabschnitts vorgesehen, so daß die Verstellung der Preßzone ohne manuellen Eingriff selbsttätig erfolgen kann.In a further embodiment is a suitable drive according to claims 17 to 19 provided for adjusting the strainer basket section on the outlet side, so that the adjustment the press zone can be done automatically without manual intervention.

    Die praktischen Ausgestaltungen gemäß den Ansprüchen 20 und 21 erlauben ein sicheres, genaues und energiesparendes Verschieben des ablaufseitigen Siebkorbabschnitts.The practical configurations according to claims 20 and 21 allow a safe, precise and energy-saving moving of the strainer basket section on the outlet side.

    Grundsätzlich könnte das Innere der Preßzone völlig leer sein. Für die meisten Suspensionen ist es jedoch gemäß den Ansprüchen 22 und 23 vorteilhaft, einen geeigneten Preßzonenkern vorzusehen. Dadurch kann auch die für eine bestimmte Drosselung erforderliche Länge der Preßzone kleiner sein.In principle, the inside of the press zone could be completely empty. For most suspensions however, according to claims 22 and 23, it is advantageous to use a suitable one Press zone core to be provided. This can also be used for a specific throttling required length of the press zone to be smaller.

    Die Erfindung wird nachfolgend an einem in einer Figur zeichnerisch dargestellten Ausführungsbeispiel näher erläutert.The invention is described below on a drawing in a figure Embodiment explained in more detail.

    Eine Schneckenpresse 10 weist eine Schneckenwelle 12 auf, die in ihrem linken oder zulaufseitigen Bereich eine Schnecke 14 trägt. Die Schneckenwelle 12 ist in Lagern 16 sowie 18 drehbar gelagert und mit einem elektrischen Motordrehantrieb 30 verbunden. Am zulaufseitigen Endbereich der Schneckenwelle 12 weist die Schneckenpresse 10 einen oberseitigen Zulauf 20 für in Pfeilrichtung A zuzuführende, zu entwässernde Suspensionen auf. Am rechten oder abablaufseitigen, schneckenfreien Bereich der Schneckenwelle 12 weist die Schneckenpresse 10 einen unterseitigen Ablauf 22 für in Pfeilrichtung B abzuleitende, entwässerte Suspensionen auf. Außerdem ist im tiefsten Bereich der Schneckenpresse 10 ein Flüssigkeitsablauf 24 vorgesehen, aus dem die aus der Suspension entfernte Flüssigkeit in Pfeilrichtung C nach unten ablaufen kann.A screw press 10 has a screw shaft 12 which is in its left or area on the inlet side carries a worm 14. The worm shaft 12 is in bearings 16 and 18 rotatably mounted and connected to an electric motor drive 30. The screw press 10 has at the inlet end region of the screw shaft 12 an inlet 20 on the top for dewatered to be fed in the direction of arrow A. Suspensions on. On the right or drain-side, screw-free In the area of the screw shaft 12, the screw press 10 has an underside Drain 22 for drained suspensions to be discharged in the direction of arrow B. Furthermore a liquid outlet 24 is provided in the deepest area of the screw press 10, from which the liquid removed from the suspension in the direction of arrow C. can run down.

    Die Schneckenwelle 12 und deren Schnecke 14 sind von einem hierzu konzentrischen Seihemantel oder Siebkorb umgeben, der einen ringförmigen Kanal für die zu entwässernde Suspension von außen begrenzt. Dieser Seihemantel oder Siebkorb hält die festen Bestandteile der Suspension zurrück und ist für Flüssigkeiten durchlässig. Er besteht im vorliegenden Fall aus einem stationären zulaufseitigen Siebkorbabschnitt 32 und einem auf diesem längsverschiebbaren, hierzu konzentrischen ablaufseitigen Siebkorbabschnitt 34. Der letztere umschließt mehr oder weniger weit eine schneckenlose Preßzone 28 der Schneckenwelle 12. Die Drosselwirkung der Preßzone 28 ist umso größer, je weiter der ablaufseitige Siebkorbabschnitt 34 nach rechts verschoben wird.The worm shaft 12 and its worm 14 are concentric of one Sheathed coat or strainer basket surrounded by an annular channel for the to draining suspension limited from the outside. This strainer coat or strainer basket retains the solid components of the suspension and is permeable to liquids. In the present case, it consists of a stationary inlet basket section on the inlet side 32 and one on this longitudinally displaceable, concentric outlet side Sieve basket section 34. The latter more or less encloses one screwless press zone 28 of the worm shaft 12. The throttling effect of the press zone 28 is the larger, the further the drain-side screen basket section 34 to the right is moved.

    Der ablaufseitige Siebkorbabschnitt 34 ist mit einem zum axialen Verschieben dienenden Antrieb 36 verbunden, der im vorliegenden Fall als hydraulische Kolben-Zylinder-Einheit ausgebildet ist. Diese ist mit dem Motordrehantrieb 30 über ein Regelglied 38 eines Regelkreises verbunden, das beispielsweise die momentane Motorantriebsleistung als Eingangssignal erhält. Wenn die Motorantriebsleistung gegenüber einem vorgegebenen Sollwert ansteigt bzw. abfällt, wird der ablaufseitige Siebkorbabschnitt 34 nach links bzw. nach rechts verschoben, um die Drosselwirkung in der Preßzone 28 mit dem Ziel eines gleichbleibenden Entwässerungsergebnisses sowie einer Maschinenschonung entsprechend abzusenken bzw. zu vergrößern.The drain-side screen basket section 34 is provided with one for axial displacement Drive 36 connected, in the present case as a hydraulic piston-cylinder unit is trained. This is with the motor rotary drive 30 via a control element 38 of a control loop connected, for example, the current motor drive power received as an input signal. When compared to the motor drive power a predetermined setpoint increases or decreases, the drain-side screen basket section 34 shifted to the left or to the right to reduce the throttling effect the press zone 28 with the aim of a constant drainage result as well as lowering or increasing machine protection.

    Das Regelglied 38 kann über den Antrieb 36 den verschiebbaren Siebkorbabschnitt 34 - zum Beispiel beim Abstellen der Presse - bis zu einer Nullposition (in der Zeichnung nach links) bewegen, in der eine vollständige Pressenentleerung problemlos erfolgen kann. Auch kann das Regelglied 38 dafür sorgen, daß diese Nullposition zum Zwecke einer Selbstreinigung und damit zur Vermeidung von Verstopfungen auch während des Pressenbetriebes angefahren wird.The control member 38 can drive the movable screen basket section 34 - for example when parking the press - down to a zero position (in the drawing to the left) in which complete press emptying is no problem can be done. The control element 38 can also ensure that this zero position for Purposes of self-cleaning and thus to avoid constipation is started up during the press operation.

    Claims (23)

    1. Screw press for dewatering suspensions in a continuous operation, having a rotatably drivable, suspension-feeding screw shaft (12), having a jacket, which with variable throttling surrounds the screw (14) of the screw shaft and a screwless pressing zone disposed downstream of the screw, having an inlet (20) for suspension to be dewatered at an inlet-side press end and having an outlet (22) for dewatered suspension disposed downstream of the pressing zone at the other press end, the jacket in the region of the screw shaft taking the form of a liquid-permeable, solids-impermeable perforated basket (32, 34) and being operation-dependently axially displaceable in the region of the pressing zone (28) for varying the latter's effective pressing zone length,
      characterized in
      that the jacket also in the region of the pressing zone (28) takes the form of a liquid-permeable, solids-impermeable perforated basket (32, 34),
      that the pressing zone (28) situated downstream of the screw shaft is free of additional active throttle elements and
      that the perforated basket (34) in the region of said screwless pressing zone is adjustable between a zero position, which is used to empty the press and in which the effective pressing zone length corresponds to the value zero, and an operating position, in which the effective pressing zone length and the consequently achievable pressing power of the pressing zone correspond to a desired operating value.
    2. Screw press according to claim 1, characterized in that the maximum distance between the zero position and a maximum operating position of the perforated basket (34) in the region of the pressing zone (28) corresponds to at least 0.5 to 1 times the outside diameter of the screw (14) of the screw shaft (12).
    3. Screw press according to claim 2, characterized in that the maximum distance between the zero position and a maximum operating position of the perforated basket (34) in the region of the pressing zone (28) corresponds to at least two times the outside diameter of the screw (14) of the screw shaft (12).
    4. Screw press according to claim 2, characterized in that the maximum distance between the zero position and a maximum operating position of the perforated basket (34) in the region of the pressing zone (28) corresponds to at least three times the outside diameter of the screw (14) of the screw shaft (12).
    5. Screw press according to one of claims 1 to 4, characterized in that the perforated basket (34) in the region of the pressing zone (28) is continuously displaceable.
    6. Screw press according to one of claims 1 to 4, characterized in that the perforated basket (34) in the region of the pressing zone (28) is displaceable in steps.
    7. Screw press according to one of claims 1 to 5, characterized in that the perforated basket is vertically divided, that its inlet-side perforated basket portion (32) is stationary and that its outlet- or pressing zone-side perforated basket portion (34) is axially displaceable.
    8. Screw press according to claim 7, characterized in that the outlet-side perforated basket portion (34) is formed coaxially with the inlet-side perforated basket portion (32) and is displaceable along the latter.
    9. Screw press according to one of claims 1 to 8, characterized in that the displaceable perforated basket or perforated basket portion (34) in the region of the pressing zone (28) takes the form of a final controlling element of a control loop (38), which during the pressing operation controls the position of the displaceable perforated basket or perforated basket portion (34) in dependence upon a preselected setpoint value and an operation-dependent actual value and which for emptying of the press or self-cleaning, as well as upon stopping of the pressing operation, moves the displaceable perforated basket or perforated basket portion (34) into the zero position and holds it in said position.
    10. Screw press according to claim 9, characterized in that the driving power of a motor-driven rotary operating mechanism (30) for the screw shaft (12) forms the actual value for the control loop (38).
    11. Screw press according to claim 9, characterized in that the axial force exerted upon the screw shaft (12) or the perforated basket (32, 34) forms the actual value for the control loop (38).
    12. Screw press according to one of claims 9 to 11, characterized in that the control loop (38) comprises a discontinuous-action loop controller.
    13. Screw press according to one of claims 9 to 12, characterized in that the control loop (38) after a stepwise variation, such as an increase, of the effective pressing zone length operates with a time delay such that a renewed stepwise variation of the effective pressing zone length is possible only after a time interval has elapsed.
    14. Screw press according to one of claims 9 to 13, characterized in that the control loop (38) for the purpose of self-cleaning interrupts the current pressing operation and moves the displaceable perforated basket or perforated basket portion (34) temporarily into the zero position.
    15. Screw press according to claim 14, characterized in that the control loop (38) at specific intervals moves the displaceable perforated basket or perforated basket portion (34) temporarily into the zero position.
    16. Screw press according to claim 14, characterized in that the control loop (38) in dependence upon specific operating conditions, such as the exceeding of a specific driving power or axial force, moves the displaceable perforated basket or perforated basket portion (34) temporarily into the zero position.
    17. Screw press according to one of claims 1 to 16, characterized by a drive (36) for axially displacing the perforated basket or perforated basket portion (34) in the region of the pressing zone (28).
    18. Screw press according to claim 17, characterized in that at least one hydraulic or pneumatic piston/cylinder drive (36) is provided, of which one end is fixed in a stationary manner and the movable other end is connected to the displaceable perforated basket or perforated basket portion (34).
    19. Screw press according to claim 17, characterized in that at least one spindle drive (36) is provided, of which one end is fixed in a stationary manner and the movable other end is connected to the perforated basket or perforated basket portion (34).
    20. Screw press according to one of claims 1 to 19, characterized in that the displaceable perforated basket or perforated basket portion (34) is guided by means of circular guides.
    21. Screw press according to one of claims 1 to 19, characterized in that the displaceable perforated basket or perforated basket portion (34) is guided by means of Vee-guides.
    22. Screw press according to one of claims 1 to 21, characterized in that the pressing zone (28) comprises an axial pressing zone core.
    23. Screw press according to claim 22, characterized in that the pressing zone core takes the form of an axial extension of the screw shaft (12).
    EP95103576A 1994-03-14 1995-03-13 Screw-press for dewatering suspensions Expired - Lifetime EP0672519B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE4408539A DE4408539A1 (en) 1994-03-14 1994-03-14 Screw press
    DE4408539 1994-03-14

    Publications (2)

    Publication Number Publication Date
    EP0672519A1 EP0672519A1 (en) 1995-09-20
    EP0672519B1 true EP0672519B1 (en) 1998-11-11

    Family

    ID=6512701

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP95103576A Expired - Lifetime EP0672519B1 (en) 1994-03-14 1995-03-13 Screw-press for dewatering suspensions

    Country Status (6)

    Country Link
    US (1) US5713268A (en)
    EP (1) EP0672519B1 (en)
    JP (2) JP3881008B2 (en)
    DE (2) DE4408539A1 (en)
    FI (1) FI107792B (en)
    WO (1) WO1995025006A1 (en)

    Families Citing this family (6)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    NL1005398C2 (en) * 1997-02-28 1998-08-31 Matheus Everardus Antonis Device for separating a substance into a substantially solid and a substantially liquid matter and such a method.
    DE10059839C2 (en) * 2000-12-01 2003-07-24 Walter Gesner Process and device for sludge thickening in mechanical-biological wastewater treatment plants
    GB0327488D0 (en) * 2003-11-26 2003-12-31 Saroko Technologies Ltd Recycling apparatus
    CN101927579A (en) * 2010-05-13 2010-12-29 孙仁和 Heating type forced grease separation squeezer and fishmeal machine
    US10654235B2 (en) 2012-06-13 2020-05-19 Iogen Energy Corporation Method for removing liquid from a slurry
    DE102021128199A1 (en) * 2021-10-28 2023-05-04 Vogelsang Gmbh & Co. Kg Separator device for dewatering moist masses

    Family Cites Families (13)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE650988C (en) * 1932-05-20 1937-10-06 Fuller Co Dust pump with a conveyor screw that penetrates the material inlet and is cantilevered in the pump drum and at the material outlet
    AT142648B (en) * 1934-05-19 1935-08-26 Paul Ing Michor Continuously acting press.
    US2678600A (en) * 1952-03-05 1954-05-18 Celanese Corp Compression and heat exchange apparatus
    FR1368883A (en) * 1963-06-26 1964-08-07 Self-regulating compactness device for continuous press
    US3276353A (en) * 1965-07-21 1966-10-04 French Oil Mill Machinery Controls for dewatering press
    GB1127934A (en) * 1965-10-04 1968-09-18 Mtk Ingenioers Ab Fa Improvements in or relating to de-watering devices
    US3394649A (en) * 1966-06-27 1968-07-30 Somat Corp Liquid extracting device
    GB1170315A (en) * 1967-03-02 1969-11-12 Stork & Co Nv Improvements in and relating to a Low Pressure Fruit Press, particularly for Oil Palm Fruits
    FR2036597A5 (en) * 1969-03-26 1970-12-24 Parr Peter Expressing grape juice
    GB1506455A (en) * 1975-03-13 1978-04-05 Stork Amsterdam Device for the extraction of liquids from fibrous substances eg oil-containing fruits
    US4291619A (en) * 1979-10-17 1981-09-29 Hunt Arthur J Screw press with controllable rear door
    DE3207878A1 (en) * 1982-03-05 1983-09-15 Hermann Berstorff Maschinenbau Gmbh, 3000 Hannover Device for mechanically separating liquids from liquid/solid mixtures
    US5012731A (en) * 1985-06-26 1991-05-07 Yves Maisonneuve Device for pressing heterogeneous mixtures with regulated pressing force for separating liquid and solid fractions thereof, in particular fruit juices

    Also Published As

    Publication number Publication date
    DE59504179D1 (en) 1998-12-17
    FI955450A (en) 1995-11-13
    JP2007000926A (en) 2007-01-11
    JPH08510413A (en) 1996-11-05
    FI107792B (en) 2001-10-15
    JP3881008B2 (en) 2007-02-14
    US5713268A (en) 1998-02-03
    EP0672519A1 (en) 1995-09-20
    WO1995025006A1 (en) 1995-09-21
    FI955450A0 (en) 1995-11-13
    DE4408539A1 (en) 1995-09-21

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