EP3723916A1 - Siebzylinder - Google Patents
SiebzylinderInfo
- Publication number
- EP3723916A1 EP3723916A1 EP18789112.2A EP18789112A EP3723916A1 EP 3723916 A1 EP3723916 A1 EP 3723916A1 EP 18789112 A EP18789112 A EP 18789112A EP 3723916 A1 EP3723916 A1 EP 3723916A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- recesses
- rod holder
- bar
- bars
- outside
- 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.)
- Granted
Links
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 230000000295 complement effect Effects 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 17
- 238000003825 pressing Methods 0.000 claims description 14
- 238000012216 screening Methods 0.000 claims description 12
- 238000005452 bending Methods 0.000 claims description 4
- 238000003698 laser cutting Methods 0.000 claims description 4
- 230000003628 erosive effect Effects 0.000 claims description 2
- 239000000725 suspension Substances 0.000 description 5
- 239000000835 fiber Substances 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005194 fractionation Methods 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/18—Drum screens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
- B07B1/4609—Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes
- B07B1/4618—Manufacturing of screening surfaces
-
- 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 cylindrical screening device with a plurality of profiled bars, in which a plurality of annular, perpendicular to the cylinder axis and spaced rod holder are provided on the inside or outside with open-edged recesses, the shape of the bar feet of the profiled bars substantially complementary and corresponds to the slightly are larger than the rod feet and in which the profile bars are used parallel to each other and parallel to the cylinder axis in the recesses
- the invention also relates to methods for producing the screening device.
- cylindrical screening devices that can be produced by the method of this type 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.
- the object of the invention is to reduce the production cost with the best possible strength and increased life of the screening device.
- this object is achieved in that at least two of each profile bar associated recesses differ in shape from each other in such a way that between them results in a slight offset of the corresponding contact surface with the profile bar.
- the offset in more than two rod holders when the direction of the offset viewed in the axial direction alternately reversed.
- the different recesses can be efficiently separated out of the rod holders by means of laser, wire or water jet cutting or the like.
- the rod holder Since the rod holder is already present as a ring and is usually made in one piece, the production is simplified considerably. In addition to an exact cylindrical shape, this results in a high accuracy in the recesses and thus the screen openings.
- laser cutting or wire EDM may result in slight deviations in shape, so that a particularly simple manufacturer driving consists in the recesses being cut out by means of a laser or erosion wire moving along the inside or outside of the respective rod holder and the beginning of the section of at least two rod holders of the screen cylinder offset from one another.
- the contact surface of axially adjacent recesses of the profiled bars is to be offset, this can be achieved particularly simply by arranging the beginning of the section of the respectively adjacent bar holder of the screen cylinder offset relative to one another. If an additional fixation of the profiled bars in the recesses is required or desired, then a permanent positive connection between the profiled bars and the recesses can be generated by radially acting from outside forces.
- the radial force is applied to the profile bars and indirectly via this on the rod holder.
- the inside of the same during the radial force should not be subjected to supporting or bending forces.
- the punches should be guided radially movably at least during the radial force action and / or be fixed axially to the cylinder axis.
- FIG. 1 shows a schematic longitudinal section through a cylindrical strainer basket
- FIGS. 2a + b a schematic cross section through different baskets
- Figures 3a + b the recess 4 with profiled bar 1 before and after the radial force
- FIG. 4 shows an axial partial section through a plurality of rod holders 3 with profiled bar 1.
- the rod holder 3 are produced as one-piece rings here by way of example by means of laser cutting, wherein the diameter is slightly larger than the final strainer basket. This is the basis for a high dimensional accuracy of the screen basket.
- the rod holder 3 have on the inside and in Figure 2b on the outside a plurality of evenly distributed recesses 4 arranged for the profile bars 1.
- the recesses 4 provide according to Figure 3a sufficient clearance, so that the profile bars 1 easily axially through this can be pushed.
- the prefabricated screen basket consists of parallel to the cylinder axis 2 extending profile bars 1, which are held over a plurality of axially spaced-apart and perpendicular to the cylinder axis 2 extending rod holder 3.
- the screen openings of the screen basket are formed by the slots of adjacent profile bars 1.
- such slots often have a width between 0.05 and 2 mm.
- the respective axially adjacent recesses 4 of a profile bar 1 differ from each other in terms of their shape, that between them a slight offset of the corresponding contact surface 6 with the profile bar 1 in the circumferential direction 7 results. Although this somewhat impedes the insertion of the profile bars 1 in the recesses 4, but simplifies the other hand, the fixation of the profile bars 1 considerably.
- the same can also be achieved with an offset in the radial direction or a mixture of both directions.
- the offset can be deliberately generated by means of the laser.
- Figure 2 b shows the other case in which the recesses 4 are present on the outside of the rod holder and the radial force is applied to the profile bars 1 and thus only indirectly on the rod holder 3.
- the inside of the rod holder 3 is exposed during the radial force no supporting or bending forces, it comes to a, albeit small reduction in the diameter of the rod holder 3 and a plastic deformation of the rod holder 3 in the region of the recesses 4, in the sequence of which the space between profile bar 1 and bar holder 3, as shown in Figure 3b, is closed.
- the radial force is thereby realized according to the figures 2a + b over a plurality of radially evenly distributed over the cylinder circumference arranged punch 5, which are directed radially from the outside to the rod holder 3 or profile bars 1 and thereby in particular to the cylinder axis 2 of the screen basket.
- the, in the pressing direction pointing pressing surface of all punches 5 each formed by a circular section whose radius corresponds to the outer radius of the screening device after the pressing process. Since the outer radius of the sieve device formed by the rod holders 3 or profiled bars 1 is slightly larger than before after the pressing process, there is a small clearance at the beginning of the pressing process between the bar holders 3 or profiled bars 1 and the pressing surface in the middle part of the punch 5.
- This game can be taken at the beginning of pressing and the associated lower pressing forces in purchasing and decreases with progressive pressure. This transformation is very gentle and even, so that it comes to the rod holders 3 to no overuse
- the punches 5 are guided axially and radially in guide grooves.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
- Photoreceptors In Electrophotography (AREA)
- Glass Compositions (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102017129765.0A DE102017129765B3 (de) | 2017-12-13 | 2017-12-13 | Siebzylinder |
PCT/EP2018/078316 WO2019115060A1 (de) | 2017-12-13 | 2018-10-17 | Siebzylinder |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3723916A1 true EP3723916A1 (de) | 2020-10-21 |
EP3723916B1 EP3723916B1 (de) | 2022-12-07 |
Family
ID=63372293
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18789112.2A Active EP3723916B1 (de) | 2017-12-13 | 2018-10-17 | Siebzylinder |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3723916B1 (de) |
DE (1) | DE102017129765B3 (de) |
FI (1) | FI3723916T3 (de) |
WO (1) | WO2019115060A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102019107261B3 (de) * | 2019-03-21 | 2020-03-26 | Voith Patent Gmbh | Siebherstellverfahren |
DE102019107693A1 (de) * | 2019-03-26 | 2020-10-01 | Voith Patent Gmbh | Drucksortierer |
Family Cites Families (4)
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 |
US6131743A (en) * | 1997-06-18 | 2000-10-17 | Hermann Finckh Maschinenfabrik Gmbh & Co. | Screen basket for fiber suspensions and method for the production thereof |
DE102006007660A1 (de) | 2006-02-22 | 2007-08-23 | Voith Patent Gmbh | Verfahren zur Herstellung einer rotations-symmetrischen, insbesondere zylindrischen Siebvorrichtung |
DE102013224528B3 (de) * | 2013-11-29 | 2014-07-24 | Voith Patent Gmbh | Siebherstellverfahren |
-
2017
- 2017-12-13 DE DE102017129765.0A patent/DE102017129765B3/de active Active
-
2018
- 2018-10-17 EP EP18789112.2A patent/EP3723916B1/de active Active
- 2018-10-17 FI FIEP18789112.2T patent/FI3723916T3/fi active
- 2018-10-17 WO PCT/EP2018/078316 patent/WO2019115060A1/de unknown
Also Published As
Publication number | Publication date |
---|---|
WO2019115060A1 (de) | 2019-06-20 |
EP3723916B1 (de) | 2022-12-07 |
DE102017129765B3 (de) | 2018-09-20 |
FI3723916T3 (fi) | 2023-03-20 |
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