EP2987906B1 - Aufgesteckter schwungring für einen rotationstrommelwäscher und verfahren zur herstellung - Google Patents

Aufgesteckter schwungring für einen rotationstrommelwäscher und verfahren zur herstellung Download PDF

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Publication number
EP2987906B1
EP2987906B1 EP15181937.2A EP15181937A EP2987906B1 EP 2987906 B1 EP2987906 B1 EP 2987906B1 EP 15181937 A EP15181937 A EP 15181937A EP 2987906 B1 EP2987906 B1 EP 2987906B1
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EP
European Patent Office
Prior art keywords
ring
holes
diameter
fly
fastener
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EP15181937.2A
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English (en)
French (fr)
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EP2987906A1 (de
Inventor
Joel Kimmett CLEMENT
I Michael Alan TARDIE
Iii Frank John Merchel
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GL&V Luxemburg SARL
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GL&V Luxemburg SARL
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D21D1/40—Washing the fibres

Definitions

  • the present invention relates to a rotary drum filtering apparatus, and more particularly to the drum structure of a rotary drum filtering apparatus, such as, for example, rotary drum filters, thickeners, washers and the like of the type employed for filtering a slurry such as pulp stock.
  • a rotary drum filtering apparatus such as, for example, rotary drum filters, thickeners, washers and the like of the type employed for filtering a slurry such as pulp stock.
  • a rotary drum filtering apparatus of this general type has included a drum structure that supports a circumferential filter medium and contains filtrate compartments communicating with the openings in the filter medium for receiving liquid drained through the latter.
  • FIG. 1 A rotary drum filtering apparatus, such as a rotary drum washer 10, is illustrated in FIG. 1 .
  • the traditional vacuum drum washer 10 includes a tank 14 having a baffled inlet box 18 and an inlet lip 22. Pulp entering the drum washer 10 passes over the lip 22 into an area 26 around a central drum 30.
  • the central drum 30 is comprised of a plurality of fly rings 34 held together spaced apart, the outer circumference of the drum supporting washer decking 38. Pulp accumulates on the decking 38 and then is removed from the decking by a takeoff 42.
  • the takeoff 42 deposits the pulp into an area 46 where a repulper 50 transports the pulp for further processing.
  • the fly ring is an integral part of the rotary washer drum's structure. It is located on the inside of the drum and its purpose is to maintain the round cross-section required to resist the loading seen by the drum while in operation.
  • the manufacturing process to make a fly ring 34 has been stagnating for decades.
  • the traditional rotary drum washer fly ring manufacturing methods involve laser cutting, welding, machining, and straightening. Although laser cutting is used, the laser cutting, together with further processing, has not produced fly ring with an outer circumference within needed tight tolerances.
  • This prior fly ring construction illustrated in FIGS. 2 and 3 consisted of 5 laser cut segments that were assembled by grinding a weld preparation on each end of each ring segment, welding the ring segment ends together, grinding the weld, and then straightening the ring. The fly ring would then be machined to the proper finished outside diameter. This process is extremely labor intensive.
  • this ring involves the following steps:
  • the new manufacturing method of this disclosure takes advantage of the accuracy of an improved method of laser cutting and eliminates welding, machining, and straightening while maintaining very tight tolerances.
  • the new method also uses a specially designed custom fastener that secures the fly ring segments together to form a precise ring. Elimination of the weld allows the fly ring to be assembled by a non-skilled tradesperson in a fraction of the time.
  • the fly ring comprises a plurality of ring segments, each ring segment being laser cut. Each ring segment has a first end which overlaps a second end of an adjacent ring segment, forming a lapped joint. Each ring segment first and second end has at least two spaced apart through-holes, the through-holes of the first end being aligned with the through-holes of the second end.
  • a custom fastener extends through the first end and second end aligned through-holes.
  • FIGS. 4 through 8 of the drawings Illustrated in the FIGS. 4 through 8 of the drawings is a fly ring 100 adapted to be used in a rotary drum washer, such as the one illustrated in FIG. 1 , the fly ring 100 comprising a plurality of ring segments 104.
  • each ring segment 104 is identical to each other, but in other embodiments (not shown), each ring segment length can be different.
  • Each ring segment 104 is laser cut, and, as illustrated in FIGS. 4, 5 , 6 and 8B , has a first end 108 which overlaps a second end 112 of an adjacent ring segment, forming a lapped joint 116. As illustrated in FIGS.
  • each ring segment first and second end has at least two spaced apart through-holes 120 and 124, the through-holes of the first end being aligned with the through-holes of the second end.
  • a custom fastener 130 extends through the first end and second end aligned through-holes.
  • the custom fastener 130 comprises a bolt with a head 134 on one side of the lapped joint 116, and a washer 140 and a nut 144 on the other side of the lapped joint 116.
  • the method comprises the following steps. First, laser cutting the plurality of arc shaped ring segments 104 out of a metal plate, each ring segment 104 having an outer circumference dimension within a predetermined tight tolerance. At least two through-holes 120 and 124 are also laser cut into each end of each segment 104.
  • the ends of the ring segments 104 are then overlapped so that the assembled ring segments form a complete fly ring 100. Because of the tight tolerance cut dimension of the outer arc of each ring segment 104, the ring 100 has a predetermined outer circumference within a given tight tolerance.
  • the custom fastener 130 is driven through each of the at least two through-holes in each end of each ring segment.
  • the custom fastener 130 is then secured in each hole by placing the washer 140 and threading the nut 144 onto the end of the fastener 130, so that the assembled segments form the ring 100.
  • the alignment of the edges of the inner circumference of the ring segments is not crucial, but the alignment of the outer circumference of the ring segments is.
  • the custom fastener 130 comprises a bolt having the head 134.
  • the custom fastener 130 also includes a first diameter portion 150 adjacent the head 134 and with a first diameter, and a neck portion 154 adjacent the first diameter portion 150 with a smaller diameter than the first diameter.
  • the custom fastener 130 also includes a third threaded diameter portion 158 adjacent the neck portion 154, the third diameter portion 158 having a third diameter greater than the neck portion diameter and less than the first diameter.
  • the end of the first diameter portion adjacent the neck portion has a first lead-in chamfer 160, and the end of the custom fastener opposite the head end has a lead-in chamfer 164.
  • Each of these lead-in chamfers aid in securing the ring segments together by accommodating and realigning any misalignment in the through-holes in the end of the rings segments.
  • the disclosed process modifies conventional laser cutting to improve its precision so that the laser cut segments can be used to form a properly dimensioned drum. More particularly, in the disclosed process, the laser cutting is speed optimized to obtain the desired tolerance and finish. The speed will vary depending on the material and power of the laser. This improved laser cutting permits the precision needed to accurately cut the ring segments. The ring segments can then be joined at a lap joint to form the precise shape needed for the drum.
  • This pinned fly ring takes advantage of this high precision laser cutting process and eliminates the need for welding, straightening, and machining while not compromising structural integrity.
  • the new design comprises laser cut ring segments and custom designed fasteners. Unlike the traditional fly ring, the joints are lap joints with pre-laser cut holes.
  • the joints between the ring segments are overlapped.
  • the holes cut by laser cutting are then aligned.
  • a custom faster is then used to secure the lapped segment ends to one another.
  • the custom fastener includes a chamfered portion which forces the aligned openings to orient themselves so the precise drum outer circumference can be achieved.
  • the custom fastener is used to maintain the tight tolerance required between the hole and the shank of the bolt.
  • Typical purchased fasteners do not have the high tolerance required to get the proper fit.
  • the neck portion between the fastener head and the threaded shank is a thread run-out groove. Because it is impossible to thread completely to a shoulder, the groove provides a means to end the thread and still tighten the nut completely.
  • the custom designed fasteners are driven into place and secured by a nut.
  • the assembly process comprises three easy steps.
  • the new assembly process can be completed in a fraction of the time and does not require special skill (such as welding) to complete.

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  • Paper (AREA)
  • Laser Beam Processing (AREA)

Claims (5)

  1. Schwungring (100), der für eine Verwendung in einer Rotationstrommelfiltervorrichtung vorgesehen ist, wobei der Schwungring (100) eine Vielzahl von Ringsegmenten (104) umfasst, wobei jedes Ringsegment (104) lasergeschnitten ist und ein erstes Ende (108) hat, das ein zweites Ende (112) eines angrenzenden Ringsegments (104) überlappt und eine überlappende Verbindung (116) bildet, wobei das erste und zweite Ende (112) jedes Ringsegments (104) wenigstens zwei voneinander beabstandete durchgehende Öffnungen (120, 124) aufweist, wobei die durchgehenden Öffnungen (120, 124) des ersten Endes (108) mit den durchgehenden Öffnungen (120, 124) des zweiten Endes (112) fluchten und ein individuelles Schließelement (130) sich durch die fluchtenden durchgehenden Öffnungen (120, 124) des ersten Endes (108) und des zweiten Endes (112) erstreckt, wobei das individuelle Schließelement (130) einen Bolzen mit einem Kopf (134) auf einer Seite der überlappenden Verbindung (116) sowie einer Unterlegscheibe (140) und einer Mutter (144) auf der anderen Seite der überlappenden Verbindung (116) umfasst.
  2. Schwungring (100) nach Anspruch 1, bei dem das individuelle Schließelement (130) eine Einführungsabschrägung (160, 164) aufweist, um das Fluchten der durchgehenden Öffnungen (120, 124) weiter zu erzwingen.
  3. Schwungring (100) nach Anspruch 1, bei dem das individuelle Schließelement (130) einen Bolzen umfasst, der einen Kopf (134), einen Abschnitt (150) mit einem ersten Durchmesser, der an den Kopf (134) angrenzt und einen ersten Durchmesser hat, einen Halsabschnitt (154), der an den Abschnitt mit dem ersten Durchmesser angrenzt und einen Durchmesser hat, der kleiner als der erste Durchmesser ist, und einen Abschnitt (158) mit einem dritten, mit Gewinde versehenen Durchmesser umfasst, der an den Halsabschnitt angrenzt, wobei der Abschnitt (158) mit dem dritten Durchmesser einen dritten Durchmesser hat, der größer als der Durchmesser des Halsabschnitts und kleiner als der erste Durchmesser ist.
  4. Schwungring (100) nach Anspruch 3, bei dem das Ende des Abschnitts (150) mit dem ersten Durchmesser, der an den Halsabschnitt (154) angrenzt, eine Einführungsabschrägung (160) aufweist, und bei dem das Ende des individuellen Schließelements (130) gegenüber dem Kopfende (134) eine Einführungsabschrägung (164) aufweist.
  5. Verfahren zur Herstellung eines Schwungrings (100) für eine Rotationstrommelfiltervorrichtung, das die Schritte umfasst:
    - Laserschneiden einer Vielzahl von bogenförmigen Ringsegmenten (104) aus einer Metallplatte, wobei jedes Ringsegment (104) eine Außenumfangsabmessung innerhalb einer vorher bestimmten engen Toleranz und wenigstens zwei durchgehende Öffnungen (120, 124) in jedem Ende jedes Segments aufweist,
    - Überlappen der Enden der Ringsegmente (104), so dass alle zusammengesetzten Segmente einen vollständigen Ring bilden, wobei der Ring einen vorher bestimmten Außenumfang innerhalb einer gegebenen engen Toleranz hat,
    - Durchstecken eines individuellen Schließelements (130) durch jede der wenigstens zwei durchgehenden Öffnungen (120, 124) in jedem Ende jedes Ringsegments (104) und Befestigen jedes Schließelements in jeder Öffnung, so dass die zusammengesetzten Segmente den Ring bilden.
EP15181937.2A 2014-08-22 2015-08-21 Aufgesteckter schwungring für einen rotationstrommelwäscher und verfahren zur herstellung Active EP2987906B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201462040788P 2014-08-22 2014-08-22
US201414831544A 2015-08-20 2015-08-20

Publications (2)

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EP2987906A1 EP2987906A1 (de) 2016-02-24
EP2987906B1 true EP2987906B1 (de) 2016-12-14

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Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5582728A (en) * 1995-11-01 1996-12-10 Tristar Industries Ltd. Pressure washer drum

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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