EP3241945A1 - Cylindre yankee - Google Patents

Cylindre yankee Download PDF

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Publication number
EP3241945A1
EP3241945A1 EP17167463.3A EP17167463A EP3241945A1 EP 3241945 A1 EP3241945 A1 EP 3241945A1 EP 17167463 A EP17167463 A EP 17167463A EP 3241945 A1 EP3241945 A1 EP 3241945A1
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EP
European Patent Office
Prior art keywords
thickness
central part
yankee cylinder
central
spp
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
Application number
EP17167463.3A
Other languages
German (de)
English (en)
Other versions
EP3241945B1 (fr
Inventor
Francesco Simoncini
Giovan Battista Mennucci
Paolo Raffaelli
Simone Pieruccini
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.)
Toscotec SpA
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Toscotec SpA
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Publication date
Application filed by Toscotec SpA filed Critical Toscotec SpA
Priority to PL17167463T priority Critical patent/PL3241945T3/pl
Publication of EP3241945A1 publication Critical patent/EP3241945A1/fr
Application granted granted Critical
Publication of EP3241945B1 publication Critical patent/EP3241945B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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

Definitions

  • the present invention relates to a Yankee cylinder. It is known that the Yankee cylinders are cylinder heated by steam, located within plants for making paper webs, whose function is to heat the paper web to complete the drying thereof through elimination of the residual water.
  • the existing Yankee cylinders are made of cast iron, steel or they comprise components made of cast iron and steel. Typically, the Yankee cast iron, or cast iron components, are made through large castings.
  • the Yankee cylinders always have the following elements: a cylindrical shell (on the outer surface of which the paper web to be dried adheres), two side ends or heads and an inner tie rod that connects the ends (useful to support the resultant force of the pressure on the ends and to allow the support of the condensate extraction system).
  • the side ends can be realized by means of cast iron castings. In this case, their shape can be optimized in such a way as to make the best use of the material.
  • steel side ends these can be made through steel casting or they can be obtained from metal plates.
  • the side ends made by casting require the availability of well-equipped foundries, capable of providing large castings (in fact, a side end may have an outer diameter greater than 6m and weigh tens of tons).
  • a side end may have an outer diameter greater than 6m and weigh tens of tons).
  • steel Yankee cylinders obtained by welding or assembly of components obtained from metal plates.
  • metal plates provides several advantages: it allows to be not bound to the working times and costs of a foundry, the plates have reduced delivery times and higher quality than that of castings (the plates can be supplied after full control against the presence of internal defects, castings may instead have blowholes or defects related to the production process). In other words, the use of metal plates makes it possible to provide a more flexible manufacturing process and to ensure a better quality of the final product.
  • the present invention particularly relates to Yankee cylinders made with steel side ends obtained from metal plates.
  • the invention relates to the manufacturing of ends for large Yankee cylinders. Examples of Yankee cylinders are disclosed in WO2011/030363 , EP2126203 and US4320582 .
  • the side ends of the above-mentioned Yankee cylinders are obtained by cutting metal plates having a suitable thickness.
  • Metal plates for manufacturing side ends of Yankee cylinders whose diameter does not exceed 4500 mm are available on the market.
  • the production of side ends for Yankee cylinders having a greater diameter implies the joining of several metal plates to reach the required dimension.
  • Another problem to be solved when side ends for large Yankee cylinders must be manufactured relates to the optimization of the use of the materials.
  • these side ends have a central hole for positioning a journal and several components of the condensate extraction system. Since the central hole reduces the structural strength of the side end, the latter is reinforced by additional metal components whose shape and dimensions are imposed by the reference standards for the dimensioning of pressurized vessels. In some cases, the reinforcements are so large that it is more convenient to directly make use of thicker metal plates.
  • Fig.1 is a schematic longitudinal section of a Yankee cylinder (Y) with a central tie rod of the known type.
  • Each of the two ends (H) has a central part (AH), inside the zone delimited by the central tie rod (T) and having an opening (AA) in correspondence with a support pin (PS), suitably perforated to allow the supply of steam inside the Yankee cylinder.
  • the ends have, in addition, an outer or peripheral portion (BH) between the central part (AH) and the mantle (M).
  • the outer part (BH) generally has at least one opening, in particular for the passage of the operators responsible for the maintenance of the machine (so called manholes).
  • the minimum thickness of the parts (AH), and (BH) depend on the overall geometry of the Yankee cylinder (in particular, the diameter of the Yankee cylinder, the size of the the tie rod and the size of the aforementioned openings). Generally, the minimum thickness of the central part (AH) and the outer part (BH) of the end, determined by calculations performed in accordance with the reference standards, are different, and, in general, the plate thickness in the outer part (BH ) it is less than that of the central area (AH).
  • Two reference standards for the calculation of the said thicknesses are ASME B&PV (Boiler and Pressure Vessels) for the USA and other countries and UNI13445 for Europe.
  • each end is made by two half-ends by welding two semicircular metal plates along a diametrical line (SD line in Fig.2A ).
  • the plates have the greater thickness (SPD in Fig.2B ) calculated according to the relevant standards and, to avoid oversizing of the same, an annular structural reinforcement (RL in Fig.1 ) is used in correspondence with the opening of the central part ( AH) of the resulting metal plate.
  • the annular reinforcement may also be provided for the openings of the peripheral part.
  • the main purpose of the present invention is to propose a construction system that allows to optimize the use of materials in the production of Yankee cylinders, to simplify the construction procedures and, at the same time, to ensure the required structural strength.
  • a Yankee cylinder in accordance with the present invention is economically and technologically advantageous.
  • a Yankee cylinder (1) in accordance with the present invention is of the type comprising a shell (10) formed by a cylindrical surface and two ends or heads (11).
  • the Yankee (1) has a central tie rod (12).
  • Each of the two ends (11) has a central part (11C), inside the area delimited by tie rod (12), and an outer or peripheral part (11P) between the central part (11C) and the shell (10).
  • the central part (11C) of each end (11) has a circular shape whose center is on the longitudinal axis (x-x) of the Yankee cylinder (1) and the peripheral part (11P) defines an annulus whose inner diameter is equal to the diameter of the central part (11C).
  • the central part (11C) and the peripheral part (11P) are concentric with each other.
  • each end (11) has an opening (11A) in correspondence with an axial bearing pin (3) that is suitably drilled along its axis to allow steam to enter into the chamber delimited by the shell (10) and the ends (11).
  • the pins (3) pass between two corresponding bearings (2).
  • the fastening bolts of the pins (3) are indicated by reference '30'.
  • the inner surface of the shell (10) may exhibit a series of grooves (100) for collecting the condensate that is formed by the heat exchange which takes place on the surface of the shell (10). The condensate is extracted from the inside of the Yankee and is recycled by using devices per se known.
  • the tie rod (12) is a tubular body having a predetermined diameter and bolted to the ends (11) and placed inside the Yankee (1) parallel to the axis (x-x) of the latter.
  • the shell (10) and the ends (11) can be made of steel of the type normally used for the construction of Yankee cylinders or, more generally, for the construction of pressure vessels.
  • the ends (11) can be welded to the shell (10), as schematically shown in Fig.8 , where the reference to "W" indicates a welding joint between an end and the shell.
  • the ends (11) can be bolted to the shell (11) as schematically shown in Fig.9 , where the reference to 'B' indicates a bolt that joins an end to the shell.
  • the ways of joining the ends to the shell are known.
  • the ends (11) are made by welding metal plates having different thickness.
  • the central part (11C) of each end (11) is formed by a single metal plate, while the peripheral part (11P) is formed by a plurality of metal plates welded to each other by means of corresponding weld beads (4) and welded to the central metal plate by means of a circumferential weld bead (5).
  • the thickness (SPC) of the central plate is greater than the thickness (SPP) of the plates forming the peripheral part (11P) of the end.
  • the central part obtained from the plate having a greater thickness (SPC) is machined at its radially outer part. Such machining makes it possible to reduce the thickness locally and only for the radially outermost part until it is equal to the smaller thickness of the peripheral part (SPP).
  • the welds (4, 5) are made on the smaller thickness (SPP).
  • the depth of the weld beads corresponds to the smaller thickness (SPP) of the metal plates used to make the cylinder end.
  • the metal plate that forms the central part (11C) is circular in shape, while the plates that form the peripheral part (11P) are three in number and are annulus segments whose outer diameter is equal to the diameter of the end (11) and whose inner diameter is equal to the outer diameter of the central part (11C).
  • the welding beads (4) are radially oriented with respect to the circumferential bead (5).
  • the shape of the plates that compose the peripheral part (11P) and the metal plate of the central part (11C) may be different from those indicated above.
  • the plate of the central part (11C) can be of polygonal shape and the plates that form the peripheral part (11P) can consequently take the form of partial circular sectors, with an outer side having the shape of a circular arc, two radial sides and a straight side, wherein the radial sides correspond to the welds (4) and the rectilinear side corresponds to the welding (5) which, in this case, will be formed by a succession of rectilinear welds.
  • the weld beads (4) are radially oriented.
  • the weld bead (4) may have a orientation different from that shown by way of example in Fig.10 .
  • the plates that compose the peripheral part (11P) and the central part (11C) define as a whole a circular end (11).
  • the weld beads (4, 5) are executed on a smaller thickness and, therefore, they are less deep.
  • the aforementioned thicknesses can be determined by applying the calculation criteria set out in the above-mentioned regulations.
  • the plate of the central part (11C) has a thickness (SPC) that is oversized compared to the value determined according to the reference standards in order to avoid the provision of an internal reinforce of the central part (11C) in correspondence with the opening (11A).
  • the thickness (SPC) of the central part (11C) is determined in accordance with the reference standards.
  • the metal plate of the central part (11C) can be reinforced with a ring (6) in correspondence with the opening (11A).
  • the peripheral part (11P) has openings (110), a corresponding reinforcing ring (7) can be applied on the inner side of the latter.
  • the thicknesses of the parts (11C) and (11P) are optimized, the use of material in excess is avoided (with the exception of the oversizing that can possibly be expected to compensate for the absence of the central reinforcement).
  • the use of a thickness (SPP) which is smaller compared to the known solutions in the part that is radially farthest from the axis of the Yankee cylinder, allows not only to reduce the overall weight of the Yankee cylinder, but also to reduce the rotational inertia. This allows, for the same acceleration and deceleration ramps provided for the regular operation of the Yankee cylinder, to use less powerful motors, with consequent economic savings.
  • the weld beads (4, 5) are formed on the smaller thickness (SPP), so that, for the same length of each bead, a lower number of welding passages is required to fill the relevant bevels and achieve welding full penetration.
  • the saved welding passages are those more superficial, namely those in correspondence of the greater width of the bevel (the bevel, due to the inclination of the relevant walls, has a progressively greater thickness going from the center of the metal plate towards the surface). Therefore, the volume of the welded joint decreases at a more than linear rate with the plate thickness reduction.
  • each weld (4, 5) is smaller in size, being formed on a lower thickness, there are lower residual stresses as a result of solidification of the welding joint.
  • the residual stresses must always be kept within acceptable limits by means of heat treatments that are normally carried out in large ovens capable of reaching high temperatures (above 500°C).
  • the duration and execution of the heat treatments depend on the thickness of the welds.
  • the use of smaller welds allows to carry out thermal treatments of shorter duration, with obvious advantages in terms of production times and energy saving.
  • the lower weld thickness allows to reduce the time required to execute repair interventions in case non-destructive tests identify an unacceptable defect.
  • the repairs in this case, require removal (usually by grinding) of the weld above the defect, until the removal of the defect itself, and the manual welding to repair.
  • a smaller thickness means less difficulties in the possible repair.
  • the circumferential weld between the central plate and the plates that compose the end can be more easily automated through the use of simple rotary tables.
  • the automation of the welding, in addition to making the process faster, allows to minimize the possibility of introduction of defects, with obvious advantages in terms of production times.
  • the dimensions of the plates can be chosen so as to optimize the use of the starting plate according to the size of the latter. When a plate having a greater size is available, two or three sectors having a greater size can be correspondingly used. If the starting plate is of a lower width, the sectors obtained from the latter will be in a higher number and will have a lower angular dimension.
  • a Yankee cylinder according to the present invention has two ends (11) each of which comprises a central part (11C) and a peripheral (11P) more distant from a central axis (x-x) of the Yankee cylinder (1) with respect to the central part (11C), and said central part (11C) has an opening (11A) in correspondence of a respective support journal (3) of the Yankee cylinder (1), said central part (11C) is formed by a metal surface having a first thickness (SPC), the peripheral part (11P) is formed by a plurality of metal surfaces having a second thickness (SPP), the first thickness is greater than the second thickness (SPC> SPP), the metal surfaces forming the peripheral part (11P) are joined together by first welding beads (4) having a depth equal to the second thickness (SPP) and are joined to the metal surface that forms the central part (11C) by a second weld bead (5) having a depth equal to the second thickness (SPP).
  • SPC first thickness
  • SPP second thickness
  • SPP second thickness
  • the metal surface that forms the central part (11C) of an end (11) is of circular shape and the metal surfaces that form the peripheral part (11P) of the same end have the shape of segments of circular sectors, the first welding beads (4) have a radial orientation and the second weld bead (5) is circular.
  • the metal surface that forms the central part (11C) of an end (11) has a non-circular (for example, polygonal) shape and the second weld bead (5) is made by a plurality of rectilinear consecutive welds.
  • the metal surface of an end that forms the central part (11C) (11) can be provided with a structural reinforcement (6) in correspondence of said central opening (11A).
  • the peripheral part (11P) of an end (11) can be provided with structural reinforcements (7) in correspondence of respective openings (110).
  • the ends (11) can be fixed in any suitable manner to the shell (10), for example by welding (W) or by screw means (B).

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  • Paper (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
EP17167463.3A 2016-05-02 2017-04-21 Cylindre yankee Active EP3241945B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL17167463T PL3241945T3 (pl) 2016-05-02 2017-04-21 Cylinder yankee

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITUA2016A003075A ITUA20163075A1 (it) 2016-05-02 2016-05-02 Cilindro monolucido.

Publications (2)

Publication Number Publication Date
EP3241945A1 true EP3241945A1 (fr) 2017-11-08
EP3241945B1 EP3241945B1 (fr) 2018-10-24

Family

ID=56740396

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17167463.3A Active EP3241945B1 (fr) 2016-05-02 2017-04-21 Cylindre yankee

Country Status (5)

Country Link
EP (1) EP3241945B1 (fr)
CN (1) CN107338669B (fr)
HU (1) HUE040464T2 (fr)
IT (1) ITUA20163075A1 (fr)
PL (1) PL3241945T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202100000458A1 (it) * 2021-01-12 2022-07-12 A Celli Paper Spa Un cilindro pressurizzabile e metodo di produzione
WO2022152722A1 (fr) * 2021-01-12 2022-07-21 A.Celli Paper S.P.A. Cylindre pour des machines produisant des bandes de cellulose et procédé associé

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111001960B (zh) * 2019-12-18 2021-06-11 安德里茨（中国）有限公司 扬克缸缸段预加工件以及用于制造扬克缸的方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4320582A (en) 1979-03-09 1982-03-23 United States Steel Corporation Yankee Dryer and method of fabrication
WO2008105005A1 (fr) * 2007-03-01 2008-09-04 Toscotec S.P.A. Cylindre yankee de machine à papier
WO2011030363A1 (fr) 2009-09-09 2011-03-17 Toscotec S.P.A. Cylindre frictionneur à isolation thermique

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT511232B1 (de) * 2011-03-21 2014-09-15 Andritz Ag Maschf Verfahren zur herstellung eines yankeezylinders

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4320582A (en) 1979-03-09 1982-03-23 United States Steel Corporation Yankee Dryer and method of fabrication
WO2008105005A1 (fr) * 2007-03-01 2008-09-04 Toscotec S.P.A. Cylindre yankee de machine à papier
EP2126203A1 (fr) 2007-03-01 2009-12-02 Toscotec S.r.l. Cylindre yankee de machine à papier
WO2011030363A1 (fr) 2009-09-09 2011-03-17 Toscotec S.P.A. Cylindre frictionneur à isolation thermique

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202100000458A1 (it) * 2021-01-12 2022-07-12 A Celli Paper Spa Un cilindro pressurizzabile e metodo di produzione
WO2022152722A1 (fr) * 2021-01-12 2022-07-21 A.Celli Paper S.P.A. Cylindre pour des machines produisant des bandes de cellulose et procédé associé

Also Published As

Publication number Publication date
CN107338669B (zh) 2019-10-29
ITUA20163075A1 (it) 2017-11-02
CN107338669A (zh) 2017-11-10
PL3241945T3 (pl) 2019-03-29
HUE040464T2 (hu) 2019-03-28
EP3241945B1 (fr) 2018-10-24

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