EP1777339B1 - Screening device for paper pulp - Google Patents
Screening device for paper pulp Download PDFInfo
- Publication number
- EP1777339B1 EP1777339B1 EP06014204A EP06014204A EP1777339B1 EP 1777339 B1 EP1777339 B1 EP 1777339B1 EP 06014204 A EP06014204 A EP 06014204A EP 06014204 A EP06014204 A EP 06014204A EP 1777339 B1 EP1777339 B1 EP 1777339B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- screening device
- screen plate
- supporting ring
- screen
- ring
- 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
Links
- 238000012216 screening Methods 0.000 title claims description 45
- 229920001131 Pulp (paper) Polymers 0.000 title claims 3
- 125000006850 spacer group Chemical group 0.000 claims description 6
- 230000000284 resting effect Effects 0.000 claims 1
- 239000000835 fiber Substances 0.000 abstract description 9
- 239000000725 suspension Substances 0.000 abstract description 6
- 230000035939 shock Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000012535 impurity Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 240000006829 Ficus sundaica Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 210000004907 gland Anatomy 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 231100000989 no adverse effect Toxicity 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
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
- D21D5/16—Cylinders and plates for screens
-
- 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
- D21D5/04—Flat screens
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
- Combined Means For Separation Of Solids (AREA)
- Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
Abstract
Description
Die Erfindung betrifft eine Siebvorrichtung gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a screening device according to the preamble of
Solche Siebvorrichtungen werden in der Papierstoffaufbereitung verwendet, z.B. in Sortierern der Zellstoff- und Papierindustrie, um die faserstoffhaltige Suspension in einer Nasssiebung zu behandeln. Dabei sollen in den meisten Fällen faserfremde Verunreinigungen auf Grund ihrer Größe an einem Sieb zurückgehalten und dann abgeschieden werden. Die Fasern können dabei zusammen mit einem Teil des Wassers die Sieböffnungen passieren. Auch Stofflöser werden oft mit Sieben versehen, die den noch nicht aufgelösten Papieranteil und grobe Störstoffe zurückhalten. Das Passieren der Sieböffnungen ist mit einem erheblichen Druckverlust verbunden. Das führt zu starken Kräften, die auf das Sieb drücken und als Druckkräfte von der Stützstruktur aufgenommen werden. Solche Siebe bestehen zumeist aus Metall, z.B. legiertem hochwertigen Stahl.Such screening devices are used in pulp processing, e.g. in sorters of the pulp and paper industry to treat the fiber-containing suspension in a wet sieving. In this case, in most cases, non-fiber impurities should be retained on a sieve due to their size and then deposited. The fibers can pass through the screen openings together with part of the water. Also, pulpers are often provided with sieves, which restrain the unresolved paper content and coarse impurities. The passage of the screen openings is associated with a significant pressure loss. This leads to strong forces that press on the screen and are absorbed as pressure forces from the support structure. Such screens are usually made of metal, e.g. alloyed high quality steel.
Um ein Verstopfen der Sieböffnungen zu verhindern, werden dicht daran vorbei bewegte zu einem Rotor gehörende Räumer verwendet, die hydraulische Druck- und Saugimpulse erzeugen. Diese Impulse können das Siebblech zu Schwingungen anregen, die sowohl die Stützstruktur als auch das Siebblech belasten. Weitere hydraulische Impulse (Stöße), die die genannten Bauteile gefährden können, stammen aus der Peripherie der Siebvorrichtung, z.B. von betätigten Schiebern und Pumpen in den Verbindungsleitungen.To prevent clogging of the screen openings, scrapers moving close to them are used to form a rotor, which generates hydraulic pressure and suction pulses. These pulses can excite the screen plate to vibrate, which burden both the support structure and the screen plate. Further hydraulic impulses (shocks), which can jeopardize the mentioned components, originate from the periphery of the screening device, eg from actuated slides and pumps in the connection lines.
Diese Verhältnisse machen eine aufwändige robuste Befestigung solcher Siebe erforderlich. Zumeist wird dadurch die freie Siebfläche vermindert. Selbst verschweißte Bauteile sind durch die Schwingungen gefährdet.These conditions make a complicated robust attachment of such screens required. In most cases, this reduces the free screen area. Even welded components are endangered by the vibrations.
Die Wirkung der Räumer lässt sich durch vorstehende Leisten noch weiter verbessern, da sie zu Turbulenzen führen, die das Festsetzen von Feststoffen verhindern. Aufgesetzte Leisten sind z.B. aus der
Der Erfindung liegt die Aufgabe zu Grunde, Siebvorrichtungen zur Nasssiebung von Papierfasersuspensionen so zu gestalten, dass sie einen einfachen Aufbau haben und dass die darin enthaltenen Siebe sicher und einfach zu befestigen sind. Verluste an freier Siebfläche durch die Befestigungsmittel sollen möglichst gering sein.The invention is based on the object of designing screening devices for wet screening of paper fiber suspensions so that they have a simple structure and that the sieves contained therein are secure and easy to attach. Losses of free screen surface through the fasteners should be as low as possible.
Diese Aufgabe wird durch die im Kennzeichen des Anspruchs 1 genannten Merkmale gelöst.This object is achieved by the features mentioned in the characterizing part of
Durch die angegebenen Maßnahmen ist es möglich, das Siebblech, sei es nun aus einem Stück hergestellt oder aus verschiedenen Segmenten zusammengesetzt, mit einfachen Mitteln auf einer vereinfachten Stützstruktur so zu befestigen, dass auch bei unvermeidbar auftretenden Schwingungen eine dauerhafte Verbindung gewährleistet ist. Es hat sich nämlich gezeigt, dass ein auf die beschriebene Weise vorgespanntes Siebblech unempfindlich ist gegen die bei solchen Siebvorrichtungen unvermeidbar auftretenden Schwingungen und hydraulische Stöße. Auch die dadurch hervorgerufenen Kräfte, die nicht als Druckkräfte von der Stützstruktur aufgenommen werden können, werden von einem erfindungsgemäß vorgespannten Siebblech zuverlässig verkraftet. Die Vorspannung des Siebbleches führt mit Vorteil zu Druckkräften, die die durch Schwingungen und Stöße erzeugten Zugkräfte überschreiten. Durch die beschriebenen Maßnahmen kann die Stützstruktur vereinfacht werden, insbesondere in dem Sinne, dass kleinere Flächen zur Auflage des Siebbleches erforderlich sind. Das vereinfacht nicht nur die Struktur und Montage, sondern bewirkt auch, dass weniger Siebfläche des Siebbleches durch die Stützstruktur versperrt wird. Allein die geringere Anzahl der bisher notwendigen Verschraubungen bedeuten eine wesentliche Vereinfachung und Verbilligung.By the measures specified, it is possible to secure the screen plate, whether it is made in one piece or assembled from different segments, with simple means on a simplified support structure so that even with inevitable vibrations occurring a permanent connection is guaranteed. In fact, it has been found that a screen plate prestressed in the manner described is insensitive to the vibrations and hydraulic shocks unavoidably occurring in such screening devices. The forces caused thereby, which can not be absorbed by the support structure as compressive forces, are reliably absorbed by a screen plate prestressed according to the invention. The bias of the screen plate leads with advantage to compressive forces that exceed the tensile forces generated by vibrations and shocks. By the measures described, the support structure can be simplified, in particular in the sense that smaller areas are required for supporting the screen plate. This not only simplifies the structure and installation, but also also causes less screen surface of the screen plate is blocked by the support structure. Alone the smaller number of previously required glands mean a significant simplification and cheapening.
Die Erfindung und ihre Vorteile werden erläutert an Hand von Zeichnungen. Dabei zeigen:
- Figur 1:
- Draufsicht auf das Sieb einer erfindungsgemäßen Siebvorrichtung;
- Figur 2:
- Schnitt durch den Siebbereich einer erfindungsgemäßen Siebvorrichtung;
- Figur 3:
- Einen variierten Stützring;
- Figur 4:
- Eine Variante zur Siebbefestigung;
- Figur 5:
- Ein weiteres für die erfindungsgemäße Siebvorrichtung geeignetes Siebblech (im Schnitt dargestellt);
- Figur 6:
- Einen erfindungsgemäß ausgeführten Sekundärstofflöser;
- Figur 7:
- Einen erfindungsgemäß ausgeführten Stofflöser.
- FIG. 1:
- Top view of the screen of a screening device according to the invention;
- FIG. 2:
- Section through the sieve region of a screening device according to the invention;
- FIG. 3:
- A varied support ring;
- FIG. 4:
- A variant for sieve attachment;
- FIG. 5:
- Another suitable for the screening device according to the invention screen plate (shown in section);
- FIG. 6:
- An inventively executed Sekundärstofflöser;
- FIG. 7:
- An inventively designed pulper.
In
Wie bereits erwähnt, werden solche Siebbleche 1 oft mit Leisten versehen, die radial oder schräg zum Radius angeordnet sein können und die die Wirkung der Siebvorrichtung insbesondere dann verbessern, wenn zusätzlich eine auflösende Wirkung in der Siebvorrichtung gewünscht wird, was z.B. bei Stofflösern und Sekundärstofflösern der Fall ist.As already mentioned,
In
In speziellen Ausführungsformen (s.
Anstelle eines kompletten mittleren Ringes könnten sich auch die Abstandshalter 14 bis zum Sieb erstrecken und dadurch als Stützelemente dienen (nicht gezeichnet).Instead of a complete central ring and the
Es ist auch vorstellbar, die Vorspannung dadurch zu erzeugen, dass das Siebblech 1' im nicht montierten Zustand geringfügig gewölbt ist, wozu in der
Eine weitere Möglichkeit, das Siebblech erfindungsgemäß auszugestalten, zeigt die
Eine Siebvorrichtung, in der die genannten Belastungsprobleme besonders stark auftreten, ist ein sogenannter Sekundärstofflöser, wie er als Beispiel in
Es gibt auch ähnlich aufgebaute Flachsieb-Drucksortierer, bei denen die Auflösewirkung des Rotors eine weit geringere oder keine Rolle spielt.There are also similarly constructed flat screen pressure sorters, in which the Auflösewirkung of the rotor plays a much smaller or no role.
Eine andere in
- 11
- Siebblechscreen plate
- 22
- Sieböffnungsieve opening
- 33
- Stützstruktursupport structure
- 44
- Innerer StützringInner support ring
- 55
- Mittlerer StützringMedium support ring
- 66
- Äußerer StützringOuter support ring
- 77
- Radialstreberadial strut
- 88th
- Leistestrip
- 99
- Gutstoffraumaccepts space
- 1010
- Gehäusecasing
- 1111
- Schraubescrew
- 1212
- Schraubescrew
- 1313
- Schraubescrew
- 1414
- Abstandshalterspacer
- 1515
- Vorsprunghead Start
- 1616
- Krümmungslinieline of curvature
- 1717
- Mittelliniecenter line
- 1818
- Auslassöffnungoutlet
- 1919
- Zulaufraumfeed space
- 2020
- Rotorrotor
- 2121
- RejektabflussRejektabfluss
- 2222
- Zulaufrohrsupply pipe
- 2323
- Behältercontainer
- 2424
- Deckelcover
- 2525
- Vertiefungenwells
- AA
- ÜberstandGot over
- A'A '
- Maßmeasure
- FF
- Faserstofffiber
- SS
- PapierfasersuspensionPaper fiber suspension
- WW
- Wasserwater
Claims (20)
- Screening device for the wet screening of paper pulp (S), having at least one screen plate (1, 1', 1") provided with a large number of screen openings (2),
and a supporting structure (3), to which the screen plate (1) is to be fixed detachably by its rear side,
a rotor (20) that can be moved along close to the screen plate (1, 1', 1"),
and an outlet opening (18) for the part of the paper pulp (S) which has passed through the screen openings (2),
the screen plate (1, 1', 1") being detachably fixed, preferably screwed, to an outer supporting ring (6) and to an inner supporting ring (4), and
the screen plate (1, 1', 1") resting on at least one supporting element arranged radially between the inner supporting ring (4) and the outer supporting ring (6),
characterized in that
on account of elastic prestress, the screen plate (1, 1', 1") exerts compressive forces on this at least one supporting element and tensile forces on the inner supporting ring (4) and the outer supporting ring (6) in each case. - Screening device according to Claim 1, characterized in that
the screen plate (1, 1', 1") rests on at least one central supporting ring (5, 5') forming the supporting element, without being fixed thereto. - Screening device according to Claim 1, characterized in that
the screen plate (1, 1', 1") is screwed to at least one central supporting ring (5, 5') forming the supporting element. - Screening device according to Claim 1, 2 or 3, characterized in that
on the side facing the screen plate (1, 1', 1"), the central supporting ring (5') has a surface provided with radially open depressions (25). - Screening device according to one of the preceding claims,
characterized in that
the screen plate (1, 1', ") is flat and has a circular or annular form. - Screening device according to one of the preceding claims,
characterized in that
the supporting rings (4, 5, 6) are joined to one another by at least one radial strut (7) and, together with the latter, form the supporting structure (3). - Screening device according to Claim 6, characterized in that
the supporting structure (3) has a single radial strut (7). - Screening device according to one of the preceding claims,
characterized in that
the supporting structure (3) has a single central supporting ring (5, 5'). - Screening device according to one of the preceding claims,
characterized in that
the supporting structure (3) is for its part detachably fixed in the housing (10) of the screening device. - Screening device according to one of Claims 1 to 8,
characterized in that
the supporting structure (3) is part of the housing (10) of the screening device. - Screening device according to one of the preceding claims,
characterized in that
the inner supporting ring (4) and the outer supporting ring (6) are joined directly to the housing (10) of the screening device, and the central supporting ring (5) is joined to the housing (10) via spacers (14). - Screening device according to one of the preceding claims,
characterized in that
when the screen plate (1) is not mounted, the central supporting ring (5, 5') projects beyond the inner supporting ring (4) and the outer supporting ring (6) in the direction of the screen plate (1) by a projection (A), which means that during the mounting of the screen plate (1), the latter is prestressed elastically and, as a result, generates the compressive forces against the central supporting ring (5). - Screening device according to Claim 12,
characterized in that
the projection (A) is between 0.2 and 5 mm, preferably 0.5 to 1 mm. - Screening device according to one of Claims 1 to 11,
characterized in that
on the side facing the central supporting ring (5), the screen plate (1") has at least one protrusion (15) which projects with respect to the remaining screen area by the dimension (A'), by which means the prestress is generated, or in that an intermediate layer, in particular a spacer ring, having a thickness corresponding to the dimension (A') is inserted. - Screening device according to Claim 14,
characterized in that
the dimension (A') is between 0.2 and 5 mm, preferably 0.5 to 1 mm. - Screening device according to one of Claims 1 to 11,
characterized in that
in the unmounted state, the screen plate (1') is slightly curved in such a way that, following the fixing to the inner supporting ring (4) and outer supporting ring (6), it exerts a compressive force on the central supporting ring (5). - Screening device according to one of the preceding claims,
characterized in that
the screen plate (1, 1', 1") is provided with a plurality of bars (8) projecting beyond the screen area of the screen plate (1, 1', 1") on the inflow side. - Screening device according to one of the preceding claims,
characterized in that
the screening device is a secondary pulper. - Screening device according to Claims 1 to 17,
characterized in that
the screening device is a pressure screen. - Screening device according to Claims 1 to 17,
characterized in that
the screening device is part of a pulper.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005049943 | 2005-10-19 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1777339A1 EP1777339A1 (en) | 2007-04-25 |
EP1777339B1 true EP1777339B1 (en) | 2010-10-06 |
Family
ID=37708301
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06014204A Active EP1777339B1 (en) | 2005-10-19 | 2006-07-08 | Screening device for paper pulp |
Country Status (6)
Country | Link |
---|---|
US (1) | US7721895B2 (en) |
EP (1) | EP1777339B1 (en) |
JP (1) | JP2007113169A (en) |
CN (1) | CN1952256B (en) |
AT (1) | ATE483852T1 (en) |
DE (1) | DE502006008007D1 (en) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009019664A1 (en) * | 2009-04-30 | 2010-11-04 | Voith Patent Gmbh | Process for treating a pulp suspension and screening device for its implementation |
FI20095769A (en) * | 2009-07-07 | 2011-01-08 | Andritz Oy | Apparatus for handling a fiber suspension |
KR101168947B1 (en) | 2009-10-07 | 2012-08-02 | (주)휠탑 | equipped with multi-screen decanter |
JP2012206111A (en) * | 2011-03-17 | 2012-10-25 | Ricoh Co Ltd | Sieving device, sieving system, and sieving method |
US8973759B2 (en) * | 2011-03-17 | 2015-03-10 | Ricoh Company, Ltd. | Sieving device, sieving device for developing device, and powder-charging device |
CN103031766B (en) * | 2011-09-29 | 2016-02-17 | 安德里茨(中国)有限公司 | For purifying and discongest equipment and the method for fibrous suspension |
WO2013186184A1 (en) * | 2012-06-13 | 2013-12-19 | Voith Patent Gmbh | Method for removing liquid from a slurry |
CN102747643B (en) * | 2012-07-17 | 2015-02-11 | 广东理文造纸有限公司 | Paper-marking water-powered slag removal system |
BR112016017470B1 (en) * | 2014-02-20 | 2020-12-15 | Haldor Topsoe A/S | REACTOR FOR A CATALYTIC PROCESS |
US20170128984A1 (en) * | 2015-11-06 | 2017-05-11 | Kolberg-Pioneer, Inc. | Apparatus and method for a removable screening plate assembly |
CN105880166B (en) * | 2016-05-10 | 2017-12-22 | 亳州沃野知识产权服务有限公司 | A kind of chemical industry powder screening plant |
CN107476108A (en) * | 2017-09-30 | 2017-12-15 | 枣庄市恒宇纸业有限公司 | A kind of paper grade (stock) Novel grading screen |
CN109225794A (en) * | 2018-09-27 | 2019-01-18 | 南京金陵化工厂有限责任公司 | A kind of rotation sieve screen device of calcium zinc stabilizer production |
CN114806757A (en) * | 2022-05-05 | 2022-07-29 | 宿州衡丞智能设备有限公司 | Beer brewing production line is with mixing fermentation system |
Family Cites Families (10)
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---|---|---|---|---|
US3477572A (en) * | 1967-05-22 | 1969-11-11 | Sweco Inc | Vibratory separator |
JPS63264111A (en) * | 1987-04-20 | 1988-11-01 | Arai Tekkosho:Kk | Tabular element for filtration or separation |
DE4308225C1 (en) * | 1993-03-16 | 1994-11-24 | Escher Wyss Gmbh | Process for sorting fiber suspension and screening device for carrying it out |
DE19506084A1 (en) * | 1995-02-22 | 1996-08-29 | Lohse Verwaltungs Gmbh | Wire unit for suspensions, e.g. pulp or sludge |
DE19649764C2 (en) * | 1995-12-02 | 2000-11-30 | Ask High Technology Tech Entwi | Device for shredding material, in particular waste paper |
EP1059381B1 (en) * | 1999-06-09 | 2004-04-21 | Voith Paper Patent GmbH | Rotor for a pulper |
DE20208439U1 (en) * | 2002-05-31 | 2003-10-09 | Voith Paper Patent Gmbh | Screw element and connecting parts for turning the screw element |
GB2395923A (en) * | 2002-12-02 | 2004-06-09 | Russel Finex | Sieving apparatus |
JP2005113301A (en) * | 2003-10-07 | 2005-04-28 | Aikawa Iron Works Co Ltd | Strainer for papermaking |
US7757864B2 (en) * | 2004-06-15 | 2010-07-20 | M-I L.L.C. | Screen assembly designed to conform to the radius of vibrating shakers with crowned decks |
-
2006
- 2006-07-08 EP EP06014204A patent/EP1777339B1/en active Active
- 2006-07-08 DE DE502006008007T patent/DE502006008007D1/en active Active
- 2006-07-08 AT AT06014204T patent/ATE483852T1/en active
- 2006-09-29 US US11/536,930 patent/US7721895B2/en active Active
- 2006-10-17 JP JP2006282474A patent/JP2007113169A/en active Pending
- 2006-10-19 CN CN2006101362556A patent/CN1952256B/en active Active
Also Published As
Publication number | Publication date |
---|---|
US7721895B2 (en) | 2010-05-25 |
ATE483852T1 (en) | 2010-10-15 |
CN1952256A (en) | 2007-04-25 |
EP1777339A1 (en) | 2007-04-25 |
DE502006008007D1 (en) | 2010-11-18 |
US20070084761A1 (en) | 2007-04-19 |
CN1952256B (en) | 2011-07-06 |
JP2007113169A (en) | 2007-05-10 |
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