EP3149239A1 - Tamis - Google Patents

Tamis

Info

Publication number
EP3149239A1
EP3149239A1 EP15722523.6A EP15722523A EP3149239A1 EP 3149239 A1 EP3149239 A1 EP 3149239A1 EP 15722523 A EP15722523 A EP 15722523A EP 3149239 A1 EP3149239 A1 EP 3149239A1
Authority
EP
European Patent Office
Prior art keywords
rod
sieve
rod holder
profile bars
recesses
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP15722523.6A
Other languages
German (de)
English (en)
Inventor
Ralf Burger
Melanie Schädler
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
Original Assignee
Voith Patent 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 Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP3149239A1 publication Critical patent/EP3149239A1/fr
Withdrawn legal-status Critical Current

Links

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

Definitions

  • the invention relates to a sieve for pulp suspensions and its production with respect to a Siebachse rotationally symmetrical shape, consisting of a plurality of mutually axially parallel profiled bars with intervening screen slots, which are clamped in open-edge recesses of bent to rings, strip-like rod holders are used, the two butt ends are firmly connected.
  • Such screens are used for example for wet screening of pulp suspensions to remove impurities present therein. As a rule, they are rigid and differ from flexible endless screens used in screen presses and paper machines.
  • cylindrical screening devices A well-known example of the use of cylindrical screening devices is the sorting of pulp suspensions, as is done in pressure sorters of the paper producing industry.
  • the fibers contained in the suspension should pass through the sieve, while the unwanted solid constituents are rejected at the gap and are led out of the sieve device again.
  • the openings have a substantially elongated shape, that is slots or gaps, allows fibrous particles to pass through more easily than the cubic ones, even though both species should be of similar size. With such a sorting technology, therefore, a very good precipitation effect of non-fibrous contaminants from pulp suspensions is possible.
  • the object of the invention is therefore to simplify its assembly while ensuring a high accuracy and strength of the screen.
  • this object is achieved in that the rod foot of the profile bars located exclusively in the bar holders is positively connected to the bar holders and the bar base is delimited over at least 40% of its radial extent by parallel and radially extending side surfaces.
  • the positive connection ensures an accurate and stable arrangement of the profile bars in the rod holders.
  • the opposite, parallel and radially extending side surfaces of the profile bars facilitate insertion into the recesses, especially at low clearance.
  • the small clearance in conjunction with the parallel side surfaces, in turn prevents tilting of the profiled bars when these are inserted into the recesses.
  • the slits should expand in the direction of flow, which is why the width of the profiled bars, preferably starting from the parallel side surfaces, increases towards the rod head.
  • beneficial flows can also be generated when the outer surface of the rod heads forms an angle with the radials that is between 60 and 85 degrees. Since the profile bars are pressed radially into the recesses with a tool acting on the rod head, the conical rod head and the inclined outer surface of the rod head increase the risk of tipping the profile bar. This makes a safe guide through the small game and the parallel side surfaces even more important.
  • the rod foot should be delimited over at least 50%, preferably at least 60% and / or over at least 3 mm, preferably at least 4 mm, of its radial extension of parallel side surfaces.
  • a positive connection between the profiled bar and bar holder can be produced in a particularly simple and secure manner by virtue of the fact that the bar holders and the profiled bars each have at least one axially extending recess or a corresponding projection. This allows a click connection between the profile bar and rod holder, so that the profile bars after their insertion already without Clamping are sufficiently fixed.
  • the profile bars should each have an axially extending recess and the rod holder has a corresponding axially extending projection for realizing a positive connection between the two.
  • the sieve according to the invention can be produced particularly advantageously from C-shaped rod holders. These should be produced by means of a cutting process, preferably by means of laser cutting. In this way, the strength can be significantly increased by the lack of stress due to the deformation of straight rod holder.
  • the two butt ends of the rod holder are brought together and connected by bending the rod holder.
  • the recesses should be on the inside the rod holder be present and the C-shaped rod holder for clamping the profile bars in the recesses are compressed to the ring shape.
  • the recesses should be present on the outside of the rod holder and the C-shaped rod holder for clamping the profile bars in the recesses are expanded to the ring shape.
  • Figure 1 a pressure sorter for pulp treatment
  • Figure 2 a cylindrical sieve 8 of the pressure sorter
  • Figure 3 the insertion of a profile bar 1 in a rod holder 2 and
  • FIG. 1 shows a pressure sorter with a cylindrical sieve 8, here with a vertical sieve 3, which divides the interior of the pressure sorter into an inlet space 16 and an accepts space 17.
  • the medium 5 to be treated i. fed to the pulp suspension.
  • the pulp suspension 5 receives an angular momentum which causes it to move circumferentially.
  • a transport flow is generated as a result of the applied pressure gradient between the above-drawn suspension inlet 18 and the underlying Rejektauslauf 19 of the inlet chamber 16.
  • this sieve scraper is formed by a rotor 23 rotating in the cylindrical sieve 8 with rotor blades 24 fastened thereto.
  • the rotor 23 has the shape of a cylindrical drum, wherein the axis of rotation 6 coincides with the Siebachse 3.
  • All rotor blades 24 in this case have the same shape, which leads to a uniform effect on the pulp suspension 5 and the screen cylinder.
  • the rotor blades 24 are arranged distributed over a plurality of perpendicular to the axis of rotation 6 extending circumferential planes of the rotor 23.
  • the rotor vanes 24 are designed, for example, as elevations on the rotor 23.
  • the cylindrical sieve 8 consists of a multiplicity of profile bars 1 extending parallel to the cylinder axis or sieve line 3, which are held over a plurality of bar holders 2, which are spaced apart axially from one another and extend perpendicular to the cylinder axis.
  • the screen openings of the screen 8 are formed by the slots 4 adjacent profiled bars 1.
  • slots 4 often have a width between 0.05 and 2 mm.
  • the C-shaped, strip-like rod holder 2 are produced as one-piece rings, for example by means of laser cutting, wherein the diameter is slightly larger or smaller than the final screen cylinder. This is the basis for a high dimensional accuracy of the screen 8.
  • the pulp suspension 5 flows centrifugally, i. from inside to outside through the sieve 8. Accordingly, the profile bars 1 are supported on the inside of the rod holder 2 from.
  • An additional attachment of the profile bars 1 can be dispensed with as a rule.
  • the profile bars 1 have outside the recess 7 a rod head 1 1 and a rod holder 9 fixed in the rod holder 9. It is essential here that the rod feet 9 and thus the corresponding recesses 7 in the rod holders 2 over here About 50% or 4 mm of their radial extent of parallel and radially extending side surfaces 10 are limited.
  • Recess 7 and also prevents tilting of the profile bars 1 when inserted into the recesses. 7
  • the profile bars 1 each have an axially extending recess 14 and the rod holder 2 has a corresponding axially extending projection 15 to realize a click connection between the two. This facilitates the assembly considerably, for the projection usually already a height of 0.15 mm is sufficient.
  • the width of the profile bars 1 before and after the recess 14 is about the same size.
  • Profile bar 1 are arranged.
  • the width of the profile bars 1 increases starting from the parallel side surfaces 10, starting from the rod head 1 1, so that a conical cross section of the rod head 1 1 results. As a result, this leads to a widening of the screen slots 4 in the flow direction, which prevents clogging of the screen 8.
  • the outer surface 12 of the rod heads 1 1 forms with the radial 13 an angle between 60 and 85 °.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

L'invention concerne un tamis (8), destiné à des suspensions de matières fibreuses (5), qui a une forme à symétrie de révolution par rapport à un axe de tamis (3), le tamis se composant d'une pluralité de barres profilées (1) qui sont parallèles entre elles suivant l'axe et entre lesquelles se trouvent des fentes de tamis (4) qui sont ménagées de façon serrée dans des évidements (7) à bord ouvert de supports de barre (2) en forme de bandes (2) et courbés en anneaux dont les deux extrémités aboutées sont reliées solidairement entre elles. La solidité du tamis (8) et son montage sont améliorés en ce que le pied (9) des barres profilées, qui se trouve dans les supports de barre (2), est relié par complémentarité de formes aux supports de barre (2) et le pied (9) des barres est limité sur au moins 40% de son étendue radiale par des surfaces latérales (10) s'étendant parallèlement et radialement.
EP15722523.6A 2014-05-28 2015-05-12 Tamis Withdrawn EP3149239A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014210189 2014-05-28
PCT/EP2015/060425 WO2015180955A1 (fr) 2014-05-28 2015-05-12 Tamis

Publications (1)

Publication Number Publication Date
EP3149239A1 true EP3149239A1 (fr) 2017-04-05

Family

ID=53177484

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15722523.6A Withdrawn EP3149239A1 (fr) 2014-05-28 2015-05-12 Tamis

Country Status (2)

Country Link
EP (1) EP3149239A1 (fr)
WO (1) WO2015180955A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107142770A (zh) * 2017-05-31 2017-09-08 瑞安市金邦喷淋技术有限公司 造纸机筛鼓的法兰盘与导流筛棒的连接结构
CN107142771A (zh) * 2017-05-31 2017-09-08 瑞安市金邦喷淋技术有限公司 造纸机的筛鼓
DE102017129752A1 (de) 2017-12-13 2019-06-13 Voith Patent Gmbh Siebherstellverfahren
DE102018101666B3 (de) * 2018-01-25 2018-09-20 Voith Patent Gmbh Siebzylinder
DE102018113932B3 (de) * 2018-06-12 2019-05-29 Voith Patent Gmbh Siebherstellverfahren
DE102019128878B3 (de) * 2019-10-25 2020-07-30 Voith Patent Gmbh Siebzylinder

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4435538C2 (de) * 1994-10-05 1996-10-02 Voith Gmbh J M Verfahren zur Herstellung eines Flachsiebes
DE102006007660A1 (de) 2006-02-22 2007-08-23 Voith Patent Gmbh Verfahren zur Herstellung einer rotations-symmetrischen, insbesondere zylindrischen Siebvorrichtung
FI124683B (fi) * 2010-10-06 2014-12-15 Aikawa Fiber Technologies Trust Menetelmä seulasylinterin valmistamiseksi

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2015180955A1 *

Also Published As

Publication number Publication date
WO2015180955A1 (fr) 2015-12-03

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