EP0275921B1 - Cleaning foil - Google Patents

Cleaning foil Download PDF

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Publication number
EP0275921B1
EP0275921B1 EP88100408A EP88100408A EP0275921B1 EP 0275921 B1 EP0275921 B1 EP 0275921B1 EP 88100408 A EP88100408 A EP 88100408A EP 88100408 A EP88100408 A EP 88100408A EP 0275921 B1 EP0275921 B1 EP 0275921B1
Authority
EP
European Patent Office
Prior art keywords
end height
maximum end
screening
vane
rotor
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
EP88100408A
Other languages
German (de)
French (fr)
Other versions
EP0275921A3 (en
EP0275921A2 (en
Inventor
Reimund Rienecker
Joachim Nittke
Lothar Pfalzer
Klaus Schmidt
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.)
JM Voith GmbH
Original Assignee
JM Voith 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 JM Voith GmbH filed Critical JM Voith GmbH
Priority to AT88100408T priority Critical patent/ATE56765T1/en
Publication of EP0275921A2 publication Critical patent/EP0275921A2/en
Publication of EP0275921A3 publication Critical patent/EP0275921A3/en
Application granted granted Critical
Publication of EP0275921B1 publication Critical patent/EP0275921B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/02—Straining or screening the pulp
    • D21D5/023—Stationary screen-drums
    • D21D5/026—Stationary screen-drums with rotating cleaning foils

Definitions

  • the invention relates to a sorting wing according to the preamble of claim 1.
  • a sorting wing has become known as the internal state of the art.
  • GB-A 254 068 describes sorters with a number of differently shaped sorting wings.
  • Figures 7 and 8 of that document are particularly relevant. Differences between the generic sorting wing and the wing according to FIG. 7 of the GB patent can be seen above all in the fact that the outer wing contour of the rear part of the wing according to FIG. 7 is composed of two basket arches. The outer contour of the front part of the wing according to FIG. 8 of that document is likewise not an arc, but rather a curve which has a kink. Therefore, none of the sorting wings according to the GB-PS fulfills the preamble of claim 1. For this reason alone, a sorting device with sorting wings of the old, previously known type would be unsuitable for modern sorting tasks which have to cope with a very high consistency of the suspension.
  • the invention has for its object to design a sorting wing according to the preamble of claim 1 such that the pulsations are reduced, the ease of manufacture and the good sorting efficiency should be maintained.
  • the sorting wing 1 comprises a rear part 2, the radial outer contour of which is an arc 4.
  • the rear part 2 has a maximum initial height h ', at the rear edge 12, and a maximum end height H.
  • the height information relates in each case to the distance between the relevant point of the outer contour and the outer surface 15 of the rotor.
  • the sorting wing 1 further comprises a front part 7, which lies in the direction of rotation in front of the rear part and begins at the point at which the maximum end height H of the rear part 2 is located.
  • the front part also has an arcuate radial outer contour, which is however concave.
  • the total length of the wing L is composed of the length L 1 of the rear part 2 and the length L 2 of the front part 7.
  • the length L 2 in the present case is 1.5 'H.
  • the radius of the front part 7 can be tapered, so that the contour of the front part 7 merges into the lateral surface 15 of the rotor - see FIG. 1.
  • the radial outer contour of the rear part 2 drops at the rear edge 12 in the radial direction onto the lateral surface 15 of the rotor.
  • the falling distance h ' is 0.2 times H.
  • the concave circular arc 8 likewise does not open into the rotor lateral surface 15 in this exemplary embodiment. Rather, there is also a steep drop in the radial direction. The extent h of this drop amounts to somewhat less than 0.2 of the maximum height H '.

Abstract

1. Screening vane (1) for a rotor with drum-like base body of a screen, which are arranged on the base body distributed over the circumference and staggered over the length, with the radial outer contour of the screening vane (1) steadily increasing in direction of rotation as circular arc up to a maximum end height (H) over the rotor shell surface (15) and then abruptly dropping in the form of a concave circular arc (8) up to the rotor shell surface (15) or to 1/10 of the maximum end height (H), so that a front portion (7) is formed, whose circumferential extension (L 2) corresponds to 1.0 to 1, 5 times the maximum end height (H), and a rear portion (2), whose maximum initial height (h') at the rear edge (12) amounts to 0.2 times the maximum end height (H) and whose length (L 1) amounts to 3 to 8 times, preferably 3 to 7 times the maximum end height (H) and, characterized in that the tangent placed onto the outer contour of the screening vane (1) in the point of the maximum end height (H) runs normal to the radius passing through this point.

Description

Die Erfindung betrifft einen Sortierflügel gemäß dem Oberbegriff von Patentanspruchs 1. Ein solcher Sortierflügel ist als interner Stand der Technik bekanntgeworden.The invention relates to a sorting wing according to the preamble of claim 1. Such a sorting wing has become known as the internal state of the art.

GB-A 254 068 beschreibt Sortierer mit einer Reihe von verschiedenartig gestalteten Sortierflügeln. Dabei sind insbesondere die Figuren 7 und 8 jener Schrift relevant. Unterschiede zwischen dem gattungsbildenden Sortierflügel und dem Flügel gemäß Figur 7 der GB-Patentschrift sind vor allem darin zu sehen, daß die Flügelaußenkontur des Hinterteiles des Flügels gemäß Figur 7 aus zwei Korbbogen zusammengesetzt ist. Die Außenkontur des Vorderteiles des Flügels gemäß Figur 8 jener Schrift ist ebenfalls kein Kreisbogen, sondern eine Kurve, die einen Knick aufweist. Deshalb erfüllt keiner der Sortierflügel gemäß der GB-PS den Oberbegriff von Patentanspruch 1. Bereits deshalb wäre eine Sortiervorrichtung mit Sortierflügeln jener alten, vorbekannten Bauart für moderne Sortieraufgaben, die eine sehr hohe Konsistenz der Suspension zu bewältigen haben, ungeeignet.GB-A 254 068 describes sorters with a number of differently shaped sorting wings. Figures 7 and 8 of that document are particularly relevant. Differences between the generic sorting wing and the wing according to FIG. 7 of the GB patent can be seen above all in the fact that the outer wing contour of the rear part of the wing according to FIG. 7 is composed of two basket arches. The outer contour of the front part of the wing according to FIG. 8 of that document is likewise not an arc, but rather a curve which has a kink. Therefore, none of the sorting wings according to the GB-PS fulfills the preamble of claim 1. For this reason alone, a sorting device with sorting wings of the old, previously known type would be unsuitable for modern sorting tasks which have to cope with a very high consistency of the suspension.

Bei allen vorbekannten Sortiervorrichtungen werden die von den Sortierflügeln hevorgerufenen Pulsationswirkungen als besonders unangenehm empfunden. Die Pulsationen pflanzen sich im gesamten System fort und erreichen gelegentlich sogar die der Sortierung nachgeschaltete Papiermaschine, was zu Störungen in der Blattbildung führt. Weiterhin ist man bei Sortiereinrichtungen bestrebt, die Herstellung der Vorrichtung so einfach wie möglich zu machen, und außerdem einen guten Sortierwirkungsgrad zu erreichen.In all of the known sorting devices, the pulsation effects caused by the sorting vanes are perceived as particularly unpleasant. The pulsations propagate throughout the system and occasionally even reach the paper machine downstream of the sorting, which leads to disturbances in sheet formation. Furthermore, in the case of sorting devices, efforts are being made to make the manufacture of the device as simple as possible and also to achieve good sorting efficiency.

Der Erfindung liegt die Aufgabe zugrunde einen Sortierflügel gemäß dem Oberbegriff von Patentanspruch 1 derart zu gestalten, daß die Pulsationen herabgesetzt werden, wobei die einfache Herstellbarkeit und der gute Sortierwirkungsgrad erhalten bleiben sollen.The invention has for its object to design a sorting wing according to the preamble of claim 1 such that the pulsations are reduced, the ease of manufacture and the good sorting efficiency should be maintained.

Diese Aufgabe wird erfindungsgemäß bei einem Sortierflügel der eingangs genannten Art durch die Merkmale des kennzeichnenden Teils des Patentanspruchs 1 gelöst.This object is achieved in a sorting wing of the type mentioned by the features of the characterizing part of claim 1.

Nachfolgend wird die Erfindung anhand von zwei in den Figuren der Zeichnung dargestellten Ausführungsbeispielen erläutert, wobei

  • Fig. 1 und 2 zwei Ausführungsformen in Ansicht parallel zur Rotorachse bei teilweise geschnittenem Rotor und
  • Fig. 3 prinzipmäßig die gegenseitige Zuordnung der Sortierflügel zeigen.
The invention is explained below using two exemplary embodiments shown in the figures of the drawing, wherein
  • 1 and 2 two embodiments in a view parallel to the rotor axis with the rotor partially cut and
  • Fig. 3 show in principle the mutual assignment of the sorting wing.

Der Sortierflügel 1 umfaßt ein Hinterteil 2, dessen radiale Außenkontur ein Kreisbogen 4 ist. Das Hinterteil 2 hat eine maximale Anfangshöhe h', an der Hinterkante 12, sowie eine maximale Endhöhe H. Die Höhenangaben beziehen sich jeweils auf den Abstand zwischen der betreffenden Stelle der Außenkontur und der Mantelfläche 15 des Rotors. Der Sortierflügel 1 umfaßt ferner ein Vorderteil 7, das in Drehrichtung vor dem Hinterteil liegt und an der Stelle beginnt, an der sich die maximale Endhöhe H des Hinterteiles 2 befindet. Das Vorderteil hat ebenfalls eine kreisbogenförmige radiale Außenkontur, die jedoch konkav ist.The sorting wing 1 comprises a rear part 2, the radial outer contour of which is an arc 4. The rear part 2 has a maximum initial height h ', at the rear edge 12, and a maximum end height H. The height information relates in each case to the distance between the relevant point of the outer contour and the outer surface 15 of the rotor. The sorting wing 1 further comprises a front part 7, which lies in the direction of rotation in front of the rear part and begins at the point at which the maximum end height H of the rear part 2 is located. The front part also has an arcuate radial outer contour, which is however concave.

Die Gesamtlänge des Flügels L setzt sich zusammen aus der Länge L1 des Hinterteiles 2 und der Länge L2 des Vorderteiles 7. Dabei beträgt die Länge L2 im vorliegenden Falle 1,5' H. Dabei kann der Radius des Vorderteils 7 spitz zulaufen, so daß die Kontur des Vorderteiles 7 in die Mantelfläche 15 des Rotors übergeht - siehe Figur 1.The total length of the wing L is composed of the length L 1 of the rear part 2 and the length L 2 of the front part 7. The length L 2 in the present case is 1.5 'H. The radius of the front part 7 can be tapered, so that the contour of the front part 7 merges into the lateral surface 15 of the rotor - see FIG. 1.

Gemäß Fig. 2 fällt die radiale Außenkontur des Hinterteiles 2 an der Hinterkante 12 in radialer Richtung auf die Mantelfläche 15 des Rotors ab. Die abfallende Strecke h' beträgt das 0,2-fache von H.According to FIG. 2, the radial outer contour of the rear part 2 drops at the rear edge 12 in the radial direction onto the lateral surface 15 of the rotor. The falling distance h 'is 0.2 times H.

Wie man aus Fig. 2 erkennt, mündet bei diesem Ausführungsbeispiel der konkave Kreisbogen 8 ebenfalls nicht in die Rotormantelfläche 15 ein. Vielmehr befindet sich auch hier ein Steilabfall in radialer Richtung. Die Erstreckung h dieses Abfalles beläuft sich auf etwas weniger als 0,2 der maximalen Höhe H'.As can be seen from FIG. 2, the concave circular arc 8 likewise does not open into the rotor lateral surface 15 in this exemplary embodiment. Rather, there is also a steep drop in the radial direction. The extent h of this drop amounts to somewhat less than 0.2 of the maximum height H '.

Claims (3)

1. Screening vane (1) for a rotor with drum-like base body of a screen, which are arranged on the base body distributed over the circumference and staggered over the length, with the radial outer contour of the screening vane (1) steadily increasing in direction of rotation as circular arc up to a maximum end height (H) over the rotor shell surface (15) and then abruptly dropping in the form of a concave circular arc (8) up to the rotor shell surface (15) or to 1/10 of the maximum end height (H), so that a front portion (7) is formed, whose circumferential extension (L 2) corresponds to 1.0 to 1, 5 times the maximum end height (H), and a rear portion (2), whose maximum initial height (h') at the rear edge (12) amounts to 0.2 times the maximum end height (H) and whose length (L 1) amounts to 3 to 8 times, preferably 3 to 7 times the maximum end height (H) and, characterized in that the tangent placed onto the outer contour of the screening vane (1) in the point of the maximum end height (H) runs normal to the radius passing through this point.
2. Screening vane according to claim 1, characterized in that the ratio of pitch to rotor diameter t/D is between 1:5 and 1:8.
3. Screening vane according to one of claims 1 or 2, characterized in that the diameter (D) of the rotor amounts to 10 to 20 times the total length of the screening vane (1).
EP88100408A 1987-01-22 1988-01-14 Cleaning foil Expired - Lifetime EP0275921B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88100408T ATE56765T1 (en) 1987-01-22 1988-01-14 SORTING WINGS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3701669 1987-01-22
DE19873701669 DE3701669A1 (en) 1987-01-22 1987-01-22 SORTING WING

Publications (3)

Publication Number Publication Date
EP0275921A2 EP0275921A2 (en) 1988-07-27
EP0275921A3 EP0275921A3 (en) 1989-02-22
EP0275921B1 true EP0275921B1 (en) 1990-09-19

Family

ID=6319230

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88100408A Expired - Lifetime EP0275921B1 (en) 1987-01-22 1988-01-14 Cleaning foil

Country Status (4)

Country Link
EP (1) EP0275921B1 (en)
AT (1) ATE56765T1 (en)
DE (2) DE3701669A1 (en)
ES (1) ES2018303B3 (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE464473B (en) * 1988-11-17 1991-04-29 Sunds Defibrator Ind Ab A screening device
DE59207688D1 (en) * 1992-06-20 1997-01-23 Finckh Maschf PRINT SORTER FOR FIBER SUSPENSIONS
FR2706495B1 (en) * 1993-06-16 1995-09-08 Lamort E & M Rotor for hydrodynamic purification under pressure of paper pulp, and device provided with this rotor.
US5566833A (en) * 1995-01-25 1996-10-22 Hermannfinckh Maschinenfabrik Gmbh & Co. Pressure sorter for fiber suspensions as well as a process for the preparation of fiber suspensions
DE102010063891A1 (en) 2010-12-22 2012-06-28 Voith Patent Gmbh pressure screens
DE102011079230A1 (en) 2011-07-15 2013-01-17 Voith Patent Gmbh pressure screens
DE102011089108A1 (en) 2011-12-20 2013-06-20 Voith Patent Gmbh Multipart rotor blade for rotationally symmetric rotor of pressurized sorting machine for cleaning of fibrous material suspension, has wire element surrounding rotor, where parts of blade are interconnected by joint and fastened to rotor
DE102012220330A1 (en) 2012-11-08 2014-05-08 Voith Patent Gmbh Pressure screen for cleaning paper pulp suspension in wet sieving, has rotor which is provided with blades-gap plane that is extended along facing side portion of screen element, and that is provided with ridges
DE102013216433A1 (en) 2013-08-20 2015-03-12 Voith Patent Gmbh pressure screens
DE202015009033U1 (en) 2015-06-03 2016-07-17 Voith Patent Gmbh pressure screens
DE102019107693A1 (en) 2019-03-26 2020-10-01 Voith Patent Gmbh Pressure sorter

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB254068A (en) * 1925-05-23 1926-07-01 Samuel Milne Improvements in or relating to mechanical screens, strainers and the like
DE2712715B2 (en) * 1977-03-23 1979-05-23 Hermann Finckh Maschinenfabrik Gmbh & Co, 7417 Pfullingen Sorter for fiber suspensions
DE2712749A1 (en) * 1977-03-23 1979-02-08 Finckh Maschf SORTER FOR SITING FIBER SUSPENSIONS
DE3006482C2 (en) * 1980-02-21 1983-04-14 J.M. Voith Gmbh, 7920 Heidenheim Rotary sorter

Also Published As

Publication number Publication date
ES2018303B3 (en) 1991-04-01
EP0275921A3 (en) 1989-02-22
ATE56765T1 (en) 1990-10-15
DE3701669C2 (en) 1989-12-14
DE3860609D1 (en) 1990-10-25
EP0275921A2 (en) 1988-07-27
DE3701669A1 (en) 1988-08-04

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