EP3929353B1 - Thermowalze für eine faserbahnmaschine - Google Patents

Thermowalze für eine faserbahnmaschine Download PDF

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Publication number
EP3929353B1
EP3929353B1 EP20181925.7A EP20181925A EP3929353B1 EP 3929353 B1 EP3929353 B1 EP 3929353B1 EP 20181925 A EP20181925 A EP 20181925A EP 3929353 B1 EP3929353 B1 EP 3929353B1
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EP
European Patent Office
Prior art keywords
thermo roll
thermo
roll according
bore
grooves
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
Application number
EP20181925.7A
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English (en)
French (fr)
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EP3929353A1 (de
Inventor
Jussi JANHONEN
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.)
Valmet Technologies Oy
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Valmet Technologies Oy
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Publication date
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Priority to EP20181925.7A priority Critical patent/EP3929353B1/de
Priority to CN202110696214.7A priority patent/CN113832764B/zh
Publication of EP3929353A1 publication Critical patent/EP3929353A1/de
Application granted granted Critical
Publication of EP3929353B1 publication Critical patent/EP3929353B1/de
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/02—Rolls; Their bearings
    • D21G1/0226—Bearings
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/021—Construction of the cylinders
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/02—Rolls; Their bearings
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/02—Rolls; Their bearings
    • D21G1/0253—Heating or cooling the rolls; Regulating the temperature
    • D21G1/0266—Heating or cooling the rolls; Regulating the temperature using a heat-transfer fluid

Definitions

  • thermo roll for a fiber web machine, which thermo roll includes
  • FI-patent number 122707 discloses a thermo roll of a fiber web machine.
  • the thermo has a roll body with two axle stubs.
  • the axle stubs are bolted to the roll body.
  • the roll body has grooves and an outer jacket.
  • channels for heat transfer medium is formed.
  • the axle stubs and the roll body have bores for leading heat transfer medium into and out of the channels. In practice, there is one axial bore for each groove.
  • the diameter of the known roll body is big as well the thickness of the wall of the roll body itself, because the axial bores and the bolts need space. Also, the bores weaken the axle stub. Thus, also the axle stubs must be massive. These features make the whole thermo roll giant and heavy. This reduces the possibility of utilizing thermo roll in different positions.
  • the object of the invention is to provide a thermo roll for a fiber web machine, which is more simply and smaller especially in diameter than before.
  • the characteristic features of the thermo roll according to the invention are stated in the accompanying Claims.
  • the thermo roll, especially the roll body and the axle stubs have less bores than before. Thus, even small axle stubs are possible.
  • the thickness of the wall of roll body can be smaller. Still, by arranging the bores in a new way, the thickness of the wall of the roll body can be minimized.
  • Fig. 1 shows a part of the fiber web machine as a side view.
  • a calender 10 with a stack 11 of rolls. At least part of the rolls are thermo rolls 12.
  • the thermo roll is heated by heat transfer medium, which is hot water or oil or other hot fluid. By heating, the properties of the fiber web, as paper for example, can be improved.
  • the guide rolls may be thermo rolls. Usually, the thermo roll is in a nip contact with another roll or thermo roll.
  • the thermo roll according to the invention may be used also elsewhere where needed, for example, in the dryer section of the fiber web machine.
  • Fig. 2a shows the thermo roll 12 according to the invention in cross section.
  • the thermo roll is intended for a fiber web machine.
  • the thermo roll 12 includes a hollow roll body 13, which has a plurality of grooves 14 on its outer surface 15.
  • the grooves 14 are shown in Fig. 4 in detail.
  • the grooves may run in the axial direction of the thermo roll, but can also run, for example, at an angle or in a spiral, to avoid, among other things, a barring phenomenon.
  • Each groove 14 extends from one end of the roll body 13 to another.
  • axial bores 16 opening to the grooves 14.
  • the thermo roll further includes an axle stub 17, which has conducts 18 extending to said axial bores 16.
  • thermo roll 12 includes an outer jacket 21 friction fitted on the roll body 13 and the axle stubs 17.
  • the friction fitting is also called as interference fitting or press fitting.
  • the outer jacket 21 closes the grooves 14 as a plurality of channels 22 for heat transfer medium.
  • the flow of the heat transfer medium is illustrated in solid arrows.
  • the heat transfer medium is fed via the axle stub 17 to the axial bores 16 and thereby into the grooves 14 and finally out of the thermo roll via the other axle stub 17.
  • the cross section of Fig. 2a has two planes showing both the groove 14 with the axial bores 16 (upside) and the bolts 19 (underside).
  • each axial bore 16 has an offset 23 opening to two adjacent grooves 14.
  • one axial bore ends to two adjacent grooves.
  • the number of bores needed is reduced by half.
  • the thickness of the wall of the roll body may be reduced.
  • the bore is so big that it as least partially reaches into two grooves 14 ( Fig. 4 ).
  • the axial bore 16 is mainly in the neck 24 between two grooves 14. So, with a single drilling, the axial bore reaching two adjacent grooves is simply machined. Alternatively, there might be first one smaller axial drilling and then further two oblique drillings reaching each to one groove.
  • the bolts are positioned in a new way.
  • the axial bores 16 and the bolts 19 are essentially in the same radius in relation to the center of the axle stub 17 ( Fig. 3 ). In this way, the thickness of the roll body may be minimized. Even then, there is enough place for the axial bores and the bolts.
  • Fig. 3 only the holes 20 for the bolts are shown, not the bolts themselves.
  • the bolts 19 is situated at the neck 24 adjacent to the axial bores 16.
  • the distance between the bolts and axial bores is essentially the same as the radius drawn through the center of the holes for the bolts and bores intersects the circuit of the adjacent hole.
  • the axle stub 17 has a conduct 18 extending to axial bore 16.
  • each conduct 18 includes a radial bore 29 situated between two adjacent grooves 14 to which radial bore 29 the corresponding axial bore 16 is arranged to open. In other words, there is one radial bore for each axial bore. When the number of the axial bores is reduced by half so is the number of the radial bores. Then there is enough material between the radial bores, so the axle stub will stand even heavy loads.
  • each radial bore 29 has a plug 30 ensuring the tightness.
  • the plugs also act as heat insulation.
  • in the axial bore 16 there is an insulation bushing 31 having an air gap 32 between the axial bore 16 and the insulation bushing 31.
  • the insulation bushing 31 ends just before the grooves ( Fig. 2b ). Then as much heat as possible ends to the grooves.
  • the insulation bushings are replaceable and there may be different sets of bushings with different diameter. So, the flow rate of the heat transfer medium can be adjusted as needed.
  • the width of the neck 24 is the same as the width of the groove 14. Then the heat is transferred evenly, and the bolts have enough space to be attached. Also, the temperature of the outer jacket stays even thereby improving the properties of the fiber web.
  • the depth of the groove diminishes in the flow direction of the heat transfer medium. In this way the stay time of the fluid is equalized. So, the temperature of the thermo roll is even, even if the heat transfer medium is fed only from one end of the thermo roll. If the flow of heat transfer medium is big enough, the temperature of the thermo roll will stay even.
  • the thermo roll may be optimized and thereby minimized.
  • the thickness of the outer jacket 21 is 20 - 40 mm. In this way, the heat is transferred more efficiently to the fiber web. Simultaneously, the mass of the thermo roll gets smaller than before. At the end, there is still a possibility to grind the outer jacket about ten millimeters.
  • the thickness of the wall of said hollow roll body may be only 60 - 80 mm, even the thermo roll is six meter long. Then, the actual nip pressure is demanding, not the space needed by the bores and the bolts. The size of the thermo roll can by then both minimized and optimized.
  • the width of the groove by be about 20 - 30 millimeters.
  • the neck is about the same size, the temperature of the outer jacket as is even over the whole diameter of the thermo roll.
  • the radial bore 29 there is an additional insulation bushing 33 having an air gap 34 between the radial bore 29 and the additional insulation bushing 33.
  • the air caps may be filled with the fluid, but when the fluid in the air caps stays still, it acts like insulation like air. Thus, no sealant is needed.
  • the beginning of the radial bore 29 is a flow divider 35 arranged inside the central bore 25. This divider equals the flow of heat transfer medium into the radial bores. Then heat is spread equally even the thermo roll rotates in a high speed.
  • both axle stubs 17 with their conducts 18 are identical for feeding heat transfer medium from one axle stub 17 via the channels 22 to the other axle stub 17.
  • heat transfer medium is fed in from one end of the thermo roll and then led out from the other end of the thermo roll.
  • a central pipe 36 for feeding or returning, like in here, heat transfer medium.
  • the heat transfer medium is fed in and lead out from one end of the thermo roll.
  • Fig. 2a with dashed lines.

Landscapes

  • Rolls And Other Rotary Bodies (AREA)

Claims (15)

  1. Thermowalze für eine Faserbahnmaschine, wobei die Thermowalze (12) folgendes enthält:
    - einen hohlen Walzenkörper (13) mit einer Vielzahl von Nuten (14) auf seiner Außenfläche (15), wobei sich jede Nut (14) von einem Ende des Walzenkörpers (13) zu einem anderen erstreckt, und in dem Walzenkörper (13) axiale Bohrungen (16) vorhanden sind, die sich zu den Nuten (14) hin öffnen,
    - einen Achsstummel (17), der Leitungen (18) aufweist, die sich zu den axialen Bohrungen (16) erstrecken und an beiden Enden des Walzenkörpers (13) durch eine Vielzahl von Bolzen (19) befestigt sind, und
    - einen Außenmantel (21), der reibschlüssig auf den Walzenkörper (13) und die Achsstummel (17) aufgesetzt ist und die Nuten (14) als eine Vielzahl von Kanälen (22) für das Wärmeübertragungsmedium verschließt,
    dadurch gekennzeichnet, dass jede axiale Bohrung (16) einen Versatz (23) aufweist, der sich zu zwei benachbarten Nuten (14) hin öffnet.
  2. Thermowalze nach Anspruch 1, dadurch gekennzeichnet, dass jede Leitung (18) eine radiale Bohrung (29) einschließt, die sich zwischen zwei benachbarten Nuten (14) befindet, wobei die entsprechende axiale Bohrung (16) angeordnet ist, um sich zu der radialen Bohrung (29) hin zu öffnen.
  3. Thermowalze nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass sich zwischen zwei radialen Bohrungen (29) ein Bolzen(19) befindet.
  4. Thermowalze nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die axialen Bohrungen (16) und die Bolzen (19) sich im Wesentlichen auf dem gleichen Radius in Bezug auf die Mitte des Achsstummels (17) befinden.
  5. Thermowalze nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass sich zwischen den Nuten (14) ein Hals (24) befindet, an dem sich die axiale Bohrung (16) befindet.
  6. Thermowalze nach Anspruch 5, dadurch gekennzeichnet, dass jeder Bolzen (19) sich auf dem Hals (24) angrenzend an die axialen Bohrungen (16) befindet.
  7. Thermowalze nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass sich in der axialen Bohrung (16) eine Isolierbuchse (31) mit einem Luftspalt (32) zwischen der axialen Bohrung (16) und der Isolierbuchse (31) befindet.
  8. Thermowalze nach einem der Ansprüche 5 bis 7, dadurch gekennzeichnet, dass die Breite des Halses (24) gleich der Breite der Nut (14) ist.
  9. Thermowalze nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die Tiefe der Nut (14) in Strömungsrichtung des Wärmeübertragungsmediums abnimmt.
  10. Thermowalze nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass die Dicke des Außenmantels (21) 20 - 40 mm beträgt.
  11. Thermowalze nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass die Dicke der Wand des hohlen Walzenkörpers (13) 60 - 80 mm beträgt.
  12. Thermowalze nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, dass sich in der axialen Bohrung (29) eine zusätzliche Isolierbuchse (33) mit einem Luftspalt (34) zwischen der radialen Bohrung (29) und der zusätzlichen Isolierbuchse (33) befindet.
  13. Thermowalze nach einem der Ansprüche 1 bis 12, dadurch gekennzeichnet, dass sich eine zentrale Bohrung (25) im Achsstummel (17) befindet und am Anfang der radialen Bohrung (29) ein Strömungsteiler (35) innerhalb der zentralen Bohrung (25) angeordnet ist.
  14. Thermowalze nach einem der Ansprüche 1 bis 13, dadurch gekennzeichnet, dass die beiden Achsstummel (17) mit ihren Leitungen (18) für die Zuführung des Wärmeübertragungsmediums von einem Achsstummel (17) über die Kanäle (22) zum anderen Achsstummel (17) identisch sind.
  15. Thermowalze nach einem der Ansprüche 13 oder 14, dadurch gekennzeichnet, dass sich innerhalb der zentralen Bohrung (25) und des Achsstummels (17) ein zentrales Rohr (36) für die Zuführung oder Rückführung von Wärmeübertragungsmedium befindet.
EP20181925.7A 2020-06-24 2020-06-24 Thermowalze für eine faserbahnmaschine Active EP3929353B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20181925.7A EP3929353B1 (de) 2020-06-24 2020-06-24 Thermowalze für eine faserbahnmaschine
CN202110696214.7A CN113832764B (zh) 2020-06-24 2021-06-23 用于纤维幅材机的热辊

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20181925.7A EP3929353B1 (de) 2020-06-24 2020-06-24 Thermowalze für eine faserbahnmaschine

Publications (2)

Publication Number Publication Date
EP3929353A1 EP3929353A1 (de) 2021-12-29
EP3929353B1 true EP3929353B1 (de) 2023-05-10

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ID=71138701

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EP (1) EP3929353B1 (de)
CN (1) CN113832764B (de)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1317805C (en) * 1987-05-14 1993-05-18 Hans-Friedrich Neuhoffer Heatable glazing or calendering roll
DE4002530A1 (de) * 1990-01-29 1991-08-01 Schwaebische Huettenwerke Gmbh Walze fuer ein glaettwerk oder einen kalander
FI20075869L (fi) * 2007-12-03 2009-06-04 Metso Paper Inc Kuiturainakoneen tela
FI20075934L (fi) * 2007-12-19 2009-06-20 Metso Paper Inc Termotela
FI122707B (fi) * 2009-03-19 2012-05-31 Metso Paper Inc Kuiturainakoneen tela
FI9458U1 (fi) * 2011-09-02 2011-11-09 Metso Paper Inc Lämmönsiirtotela
EP2634307B1 (de) * 2012-03-02 2016-05-11 Valmet Technologies, Inc. Verfahren zur Modernisierung eines Superkalenders und eines modernisierten Superkalenders

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Publication number Publication date
CN113832764A (zh) 2021-12-24
CN113832764B (zh) 2023-07-07
EP3929353A1 (de) 2021-12-29

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