JP6498593B2 - Yankee cylinder for drying webs of cellulosic material - Google Patents

Description

  The present invention is a Yankee cylinder for drying a web of cellulosic material, comprising a cylindrical shell, an end head welded to each axial end of the cylindrical shell, and connected to each end head It is related with a Yankee cylinder provided with a heat insulation part.

  In papermaking technology, Yankee cylinders are used to heat wet paper webs with heat. Generally, the interior of a Yankee cylinder is heated by steam. In order to avoid heat loss to the outside, the Yankee cylinder is often insulated at the end head (that is, the cylindrical cover forming the end wall). An example of such heat insulation is described in Patent Document 1, for example. Normally, Yankee cylinders are manufactured by casting, and the end head (cylindrical cover) often has a curved shape, including a shape close to a bell shape, depending on the method used for manufacturing. When such an end head is covered with a heat insulating panel, it is easy to provide a heat insulating air layer between the end head and the heat insulating panel, which can be an important part for providing a heat insulating effect. Recently, various Yankee configurations have been proposed that produce Yankee cylinders by a welding process rather than casting. For various reasons associated with current manufacturing methods, end heads are usually substantially flat. An example of such a welded Yankee cylinder is disclosed in Patent Document 2, for example. When fixing a thermal insulation panel to such an end head, additional steps need to be added to create a layer of air between the thermal insulation panel and the end head. Patent Document 3 proposes a configuration in which a connection ring is fixed to each end head and the connection ring is welded to a flat surface outside the end head. The heat insulating part is fixed to the connection ring and the support journal. The heat insulating part includes a plurality of different segments. A similar configuration is also disclosed in Patent Document 4. In the configuration disclosed in Patent Document 3, a solution to a technical problem when a heat insulating air layer is provided between the segment of the heat insulating portion and the end head is proposed. However, the solution proposed in this document requires the entire connection ring to be welded to each end head. The object of the present invention is to propose another solution which is of a simple construction which is not complex and can be easily adapted to existing Yankee cylinders. As described below, the above and other objects are achieved by the present invention.

U.S. Pat. No. 4,520,578 International Publication No. 2008/105005 International Publication No. 2011/030363 International Publication No. 2013/087597

  The present invention relates to a Yankee cylinder for drying a web of cellulosic material. The Yankee cylinder of the present invention comprises a cylindrical shell having a substantially cylindrical outer surface and two axial ends, and an end head located at each axial end of the cylindrical shell. The end head is substantially flat so as to have a flat outer surface (outer surface). The end head is fixed to the cylindrical shell by welding so as to define the interior space of the Yankee cylinder together with the cylindrical shell. Each end head has a circular outer periphery, and when the support journal is supported by a bearing, the support journal is fixed to each end head of the Yankee cylinder so that the Yankee cylinder can rotate around the rotation axis. . A heat insulating portion is connected to each end head, and the heat insulating portion on each end head includes a plurality of divided segments distributed around the end head. According to the invention, each end head is provided with a plurality of separate distance pieces in the area of the end head located between the circular outer periphery of the end head and the support journal. The separate distance pieces are spaced apart from each other and are fixed to the end head so as to protrude from the end head. Each segment is secured to at least two such distance pieces such that it is held at a position spaced from the end head.

  In the embodiment of the present invention, the divided segments are a first divided segment group arranged at a position radially inward with respect to the support journal, and a second group arranged at a position radially outside with respect to the support journal. Divided into divided segment groups. In such an embodiment, the divided segments in the first group of divided segments may optionally be secured to the support journal at the radially innermost edge.

  For an embodiment having two such segment segments, each segment segment belonging to the first group is such that the segment segments are relatively movable in the radial direction and the segment segments of the first group are more radially outward than the outer segments. You may fix to a support journal and an end head so that the freedom degree which moves inside may become high. Each split segment belonging to the second group has an end portion so that the split segment is relatively movable in the radial direction and the second group of split segments has a high degree of freedom to move outward from the radially inner side. It may be fixed to the head.

  The split segment may have a side flange that extends toward the end head.

  Optionally, a curved flange extending toward the end head may be welded to the radially outermost edge of each divided segment belonging to the second divided segment group.

  Each distance piece preferably has an internal thread at the end that contacts each segment, and the segment may have a through-hole that is sized to prevent the distance piece from passing therethrough. In addition, the segment may be fixed to the distance piece by the threaded bolt extending through the through hole in the segment and into the female screw of the distance piece.

  Each divided segment is fixed to several distance pieces. In an embodiment of the present invention, each split segment is secured to a corresponding distance piece by a threaded bolt and washer, and the washer acts as a spacer between the bolt head and the outer surface of the split segment. The washer may further include an extension that acts as a bushing for the bolt and centers the shaft of the bolt within the through hole of the split segment. The bushing is optionally fitted within the through hole with a tolerance so that the segment segment and the distance piece and the corresponding threaded bolt can be moved relative to each other. For the selected distance piece, the washer used to connect to the bolt of the selected distance piece may have a bushing that is fitted with a smaller tolerance than the bushings used for other bolts. This restricts the relative movement between the split segment and the selected distance piece and corresponding bolts relative to other distance pieces to which the split segment is fixed.

  The split segments are preferably (but not essential) made of sheet metal, for example steel, and the insulation sheet is optionally fixed to each split segment on the side facing the end head of the split segment. Well, preferably, a layer of air separates the insulation sheet from the end head.

  The heat insulating material sheet may contain aluminum.

  In embodiments of the present invention, the split segments are separated from each other such that adjacent split segments are not connected to each other except indirectly connected via a common end head or support journal.

  A manhole may be disposed in at least one of the end heads, and the manhole is preferably located on the back side of the divided segment in the second divided segment group.

1 is a schematic view of a Yankee cylinder used to dry a web of cellulosic material. FIG. 1 is a cross-sectional view of an embodiment of a Yankee cylinder according to the present invention. The enlarged view of the part III shown with a broken line in FIG. The perspective view of one Embodiment of the Yankee cylinder by this invention of a state without a heat insulation part. The perspective view corresponding to FIG. 4 with which the heat insulation part was fixed to the Yankee cylinder. The perspective view which shows two segments which form a part of heat insulation part. The perspective view which shows another aspect of the segment which forms a part of heat insulation part. The figure which shows a screwed bolt. FIG. 4 is a cross-sectional view of a washer used for a threaded bolt having an extension that can act as a bushing for the threaded bolt shaft. Sectional drawing of a distance piece. Sectional drawing which shows a part of segment of the heat insulation part fixed to the edge part head. FIG. 11 is an enlarged view of a portion of FIG. 10 showing a segment secured to the distance piece and the distance piece secured to the end head. FIG. 3 is a cross-sectional view showing a portion of two adjacent segments that are secured to an end head. Sectional drawing which shows a mode that a segment is fixed to one of several distance pieces, and is fixed to a part of support journal in one edge part. FIG. 3 is a front view of an element that can be used to secure insulation to a split segment. FIG. 14b is a side view of the same elements as shown in FIG. 14a. Sectional drawing which shows a mode that a heat insulating material may be fixed to a division | segmentation segment.

  Referring to FIG. 1, a Yankee cylinder 1 for drying a web W is shown. As shown in FIG. 1, a web of cellulosic material passes through a fabric 42, such as felt, around a roll 41, which can be, for example, a suction roll or an expanded nip roll. For example, the roll 41 may be a roll as disclosed in US Pat. No. 7,527,708 or European Patent No. 2085513 (B1). The web may be any type of fibrous web, but in particular may be a tissue paper web intended for applications such as, for example, toilet paper or paper towels. The web W is transferred to the Yankee cylinder 1 in a nip formed between the roll 41 and the Yankee cylinder 1, and after passing through the surface of the Yankee cylinder, as known to those skilled in the art of the present invention, Peel off by doctor 43. Reference numeral 13 denotes a Yankee cylinder support journal.

  The interior of the Yankee cylinder is usually heated by steam. When the web W passes over the outer surface of the Yankee cylinder, moisture contained in the web W evaporates and the web W is dried. The present invention relates to a Yankee cylinder for such applications. FIG. 2 is a cross-sectional view showing an embodiment of the Yankee cylinder of the present invention. As can be seen from FIG. 2, the Yankee cylinder 1 includes a cylindrical shell 2. The cylindrical shell 2 has a substantially cylindrical outer surface (see FIG. 1 in addition). The cylindrical shell 2 has two axial ends, namely a first axial end 3 and a second axial end 4. Each axial end 3, 4 has an end head 5, 6. The end heads 5, 6 are substantially flat so as to have a flat outer surface (see surface 70 in FIG. 4). The end heads 5 and 6 are fixed to the cylindrical shell 2 by welding. The weld connection is indicated by reference numeral 7. The end heads 5 and 6 may be welded to the cylindrical shell 2 and may be welded, for example, by the method disclosed in International Publication No. 2008/105005 or International Publication No. 2014/077771. In this way, the cylindrical shell 2 and the end heads 5, 6 define an internal space 8 of the Yankee cylinder 1.

  The end heads may be connected to each other by a tubular connecting member 9 fixed to the end heads 5, 6 by bolts 10.

  As can be seen from FIGS. 1 and 4, each end head 5, 6 has a circular outer periphery 11. As shown in FIG. 2, the support journals 12 and 13 are fixed to the end heads 5 and 6 of the Yankee cylinder 1, so that when the support journals 12 and 13 are supported by the bearings, the Yankee cylinder 1 rotates. It becomes possible to rotate around the axis R (see FIGS. 2 and 5). The support journals 12 and 13 may be fixed to the tubular connecting member 9 by bolts 14. The support journal preferably has an opening 15 that can heat the cylindrical shell 2 and supply thermal steam to the internal space 8 so that the cylindrical shell 2 evaporates the water in the web W. The condensed water can be discharged from the Yankee cylinder. On the inner surface of the cylindrical shell 2, the cylindrical shell may have a circumferential groove 60 for receiving condensed water. The condensed water can be discharged, for example, by the method disclosed in International Publication No. 2012/033444.

  According to the present invention, as shown in FIGS. 2 and 3, the heat insulating portion 16 is connected to each of the end heads 5 and 6.

  As will be described below, the heat insulating portion 16 connected to each of the end heads 5 and 6 extends the end heads 5 and 6 over the end heads 5 and 6 in the circumferential direction of the end heads 5 and 6. A plurality of divided segments 17 and 18 are arranged so as to cover them. Reference is now made to FIG. FIG. 4 shows the Yankee cylinder 1 in a state before the heat insulating portion is fixed to the end head. As can be seen from FIG. 4, a plurality of separate distance pieces 19 are distributed over the end head 6. The same applies to the end head 5 on the opposite side. A separate distance piece is arranged in the region of the end heads 5, 6 located between the circular outer periphery 11 of each end head 5, 6 and the respective support journals 12, 13 of the end heads 5, 6. The The separate distance pieces 19 are spaced from each other and are fixed to the end heads 5 and 6 so as to protrude from the respective end heads 5 and 6.

  Reference is now made to FIG. When fixing the heat insulating part 16 to the end heads 5, 6, each divided segment 17, 18 is fixed to at least two such distance pieces 19, and the divided segments 17, 18 are connected to the end heads 5, 6. The segment segments 17 and 18 are fixed to the distance piece 19 so as to be held by the distance piece 19 at a position away from the distance piece 19.

  In the embodiment shown in FIG. 5, the divided segments 17 and 18 have a first divided segment 17 group disposed at a position radially inward with respect to the support journals 12 and 13 and a radius with respect to the support journals 12 and 13. It is divided into a second divided segment group 18 provided at a position outside in the direction. However, it should be understood that embodiments in which each split segment extends to cover the portion of the end head 5,6 from each support journal to each outer peripheral portion 11 of the end head 5,5 are also contemplated.

  Before describing the method of securing the segment segments 17 and 18 to the distance piece 19, a possible embodiment of the segment segments 17 and 18 will be described with reference to FIGS. The split segments 17, 18 may preferably be made of sheet metal, but other materials, for example ceramic materials, can also be envisaged. In the embodiment shown in FIG. 6, the segments 17 and 18 have side flanges 23 obtained by bending a sheet metal that is a material of the segment. As shown in FIG. 7, the segment 18 intended to be located at the radially outermost position may have a curved side flange 24 that is difficult to bend. Such a flange 24 can be welded separately to the radially outermost edge of the segment 18. When the segments 17 and 18 are fixed to the distance piece 19, the side flanges 23 and 24 are fixed so as to face the end heads 5 and 6 and extend toward the end heads 5 and 6. Preferably, the segments 17, 18 extend to the end heads 5, 6 so as to contact the end heads 5, 6. As described below, the divided segments 17 and 18 have through holes 28 and 29 into which bolts can be fitted together with bushings.

  FIGS. 8a, 8b and 9 show the elements used to secure the split segments 17,18. FIG. 8 a shows a bolt 30 having a bolt head 31 and a shaft 32 having a threaded portion 34. FIG. 8 b shows a washer 35 having a through hole 52 and an extension 36 that can act as a bushing for the shaft 32 of the bolt 30. FIG. 9 shows a separate distance piece 19 having a through hole 44. At each end of the through hole 44 of the distance piece 19, there are internal threads 45, 46 that can cooperate with threaded bolts.

  In the following, reference is made to FIG. 10, which is a sectional view showing a method of fixing the segment 18 to the end head 6 using the distance piece 19. The distance piece 19 is fixed to the end head 6 by a bolt 26 having a screw that cooperates with the internal thread 46 of the distance piece 19. The bolt 26 may itself be fixed to the end head 6 by a screw. The divided segment 18 is arranged over the distance piece 19 so that the through hole 28 of the divided segment 18 coincides with the through hole 44 of the distance piece 19. The washer 35 is attached to the shaft 32 of the bolt 30, and the shaft 32 extends into the through hole 44 so that the threaded portion 34 of the bolt 30 can engage with the female screw 45 of the distance piece 19. As can be seen from FIG. 11, the washer 35 has a dimension such that a certain tolerance exists between the outer diameter of the extension 36 and the inner diameter of the through hole 28 of the divided segment 18. Thus, there is play P between the extension 36 and the through hole 28 of the segment 18. Such play P allows a relative movement between the divided segment 18 and the distance piece 19 to some extent, thereby allowing a relative movement between the divided segment 18 and the end walls 5 and 6 to some extent. . Referring to FIGS. 10 and 11, the bolt head 30 can act on the washer 35 to press the washer 35 against the segment 18, and the segment 18 presses against the outer end of the distance piece 19. It can be seen that Accordingly, the segment 18 is fixed to the end head 6 by being fixed to the separate distance piece 19 (the other end head 5 is also the same). Each segment 17 and 18 is secured to each of the end heads 5 and 6 by at least two distance pieces 19 as described above. Preferably, the segments 17, 18 are secured to each end head 5, 6 by three or more such distance pieces. For example, the segments 17, 18 can be fixed to 3-10 such separate distance pieces 19. In the embodiment considered by the inventors, the radially outermost segment 18 can be fixed to eight such distance pieces 19 and the radially innermost segment 17 can be fixed to three such distances. It is fixed to the piece 19.

  Referring to FIG. 10, the heat insulating sheet 38 is fixed to the divided segment 18 on the side facing the end head 6 of the divided segment 18, and the heat insulating sheet 38 and the end heads 5, 6 It can be seen that the air layers are separated. Such a heat insulating sheet 38 may be made of aluminum or contain aluminum. A commercially available insulation under the trade name AluCoat is also available. The inventors of the present invention are that the most important part of the heat insulation effect is due to the air layer between the segments 17 and 18, and that a separate heat insulation sheet contributes only moderately. I don't think so. Still, the heat insulating material sheet 38 can make the heat insulating property more effective. However, the heat insulating material sheet 38 is optional, and an embodiment without such a heat insulating material sheet 38 is also conceivable. As can be seen from FIG. 10, the heat insulating material sheet 38 is separated from the surface of the end head 6 by a distance D so that there is a space 39 in which there is nothing other than air. Thus, the space 39 constitutes a layer of air that separates the segment 18 from the end head 6. From FIG. 10, it can be seen that the curved flange 24 of the segment 18 is in contact with the surface of the end head 6 near the outer peripheral portion 11 of the end head 6.

  Referring to FIG. 12, adjacent split segments 18, 18 (or 17, 18) are indirectly connected through common end heads 5, 6 or support journals 12, 13, but are not connected to each other. Thus, it can be seen that the two divided segments 18 are fixed to the distance piece 19. In this way, an interval may be provided between the segments 17 and 18. In other words, each segment 17, 18 can be fixed or disconnected from its respective end head 5, 6 independently of the other divided segments 17, 18. In addition, the end heads 5 and 6 have a portion that is not covered by the segments 17 and 18, but the inventors of the present application particularly affect the overall thermal insulation efficiency even if such a portion is present. I think not.

  Referring to FIG. 13, it is shown that the divided segments 17 positioned at the radially inner positions with respect to the support journals 12 and 13 can be fixed. At the radially inner edge of the split segment 17 (see also FIG. 6), the split segment 17 is fixed directly to the support journal 13 by a fixing element 26 such as a screw or bolt or an equivalent fixing element. The split segments are fixed to the distance piece 19 away from the support journal 13 in the same manner as described above with reference to FIGS.

  Hereinafter, an example of a method of fixing the heat insulating material sheet 38 to the segments 17 and 18 will be described with reference to FIGS. 14a, 14b and 15. A separate fastening element 47 is shown in FIGS. 14a and 14b. The fixing element is preferably made of a metal material such as steel or copper, for example. 14b is a side view of the same element 47 shown in FIG. 14a. The fixing element 47 has two legs 49, which have a tapered end 50 and are connected to each other by a bottom 48. The bottom 48 can be glued, riveted, screwed, soldered or otherwise secured to the surface of the segments 17, 18.

  Then, the heat insulating material sheet 38 is pressed against the fixing element 47 so that the tapered end portion 50 of the leg portion 49 penetrates the heat insulating material sheet. Since the leg portion 49 has a length exceeding the thickness of the heat insulating material sheet 38, the leg portion 49 extends beyond the heat insulating material sheet 38 penetrated. When the leg 49 completely penetrates the heat insulating material sheet 38, it can be bent as shown in FIG. 15 so as to fix the heat insulating material sheet 38 to the segments 17 and 18. As an alternative to the separate fixing element 47, the insulation sheet 38 may be fixed by adhesion to the segments 17, 18. Also contemplated are embodiments in which the adhesive and securing element 47 can be used in combination, as shown in FIGS. 14a and 14b. It is also appropriate that each divided segment 17, 18 has its own insulation sheet 38 having a shape that matches the shape of the particular segment 17, 18.

  According to a preferred embodiment of the present invention, each divided segment 17 belonging to the first group has a supporting journal 12, 13 and end heads 5, 6 such that the divided segment 17 is relatively movable in the radial direction. Fixed to. Preferably, the divided segments 17 in the first segment group have a high degree of freedom to move inward rather than radially outward. Preferably, each divided segment 18 belonging to the second segment group is fixed to the end heads 5 and 6 so that the divided segment 18 can be relatively moved in the radial direction. Regarding the second segment group, it is preferable that each of the divided segments 18 has a high degree of freedom to move outward from the inside in the radial direction.

  As described above, each divided segment 17, 18 is fixed to several distance pieces 19, and each segment 17, 18 has a washer 35 between the head 31 of the bolt 30 and the outer surface of the divided segments 17, 18. It is fixed to the distance piece 19 by a threaded bolt 30 and a washer 35 so as to act as a spacer between them. As described above, the washer 35 has an extension, which forms a bushing 36 for the threaded bolt 30 and is centered on the shaft 32 of the threaded bolt 30 in the through-holes of the segment segments 17, 18. Match. Since the bushing 36 is fitted with a tolerance in the through hole, the divided segments 17, 18, the distance piece 19 and the corresponding threaded bolt 30 can be moved relative to each other.

  Referring to FIG. 6, the split segments 17, 18 have through holes 28, 29 for bolts 30 and corresponding washers 35. In FIG. 6, reference numeral 29 is used to indicate a through hole having a smaller diameter than the through hole 28. Therefore, the bushings (extensions) 36 used for connection with the through holes 29 are fitted with a smaller tolerance than the bushings 36 used for the other through holes and the corresponding threaded bolts 30. In this way, the relative movement between the split segments 17, 18 and the distance piece 19 is more constrained in that the bushing 36 is attached to the smaller through hole 29, while the split segments 17, 18 and The relative movement with respect to the corresponding distance piece 19 is less restricted in the larger through hole 28. Here, the bolt 30 and the washer 35 are all assumed to have the same dimensions except for decisive factors such as actual tolerance. The important thing is that there are places where the tolerance is small depending on the location. In the embodiment shown in FIG. 6, the radially inner segment 17 has a through-hole 29 having a smaller diameter disposed near its radially outermost edge. In this way, the room for relative movement increases as the direction proceeds inward in the radial direction. Such relative movement can be caused by, for example, thermal expansion. On the other hand, the radially outermost segment 18 has a through-hole 29 having a smaller diameter near its radially innermost edge. Thus, there is less room for expansion / relative movement in the radially inward direction. If there is relative movement between the outer segment 18 and the corresponding end head 5, 6, most of the relative movement will be in a direction radially away from the support journals 12, 13.

  The relative movement between the segment and the corresponding threaded bolt 30 (and thus the end heads 5, 6) is more restricted in a given direction.

  Referring to FIG. 4, a manhole 40 is disposed in at least one of the end heads 5 and 6. Preferably, the manhole 40 can be located on the back side of the divided segment 18 in the second divided segment group. In this way, the manhole 40 can be accessed even if there is only a small part for removing the heat insulating part.

  A separate distance piece protruding from the surface of the end head provides the advantage that it is not necessary to fix the ring to the outer periphery of the end head by fixing the segment segments to the end head respectively. The present invention provides a simple method of securing the thermal insulation to the end heads such that the thermal insulation segments are held away from the end heads 5,6. This creates an air insulation layer between the segment and the end head. In the embodiment in which the segments are divided into the radially inner group and the radially outer group, the size of each segment can be reduced, which has the advantage that each segment can be easily transported and handled when connected to the end head. can get. In addition, it is possible to access the manhole even if only a small part of the heat insulating part is removed.

  If the segment is a side flange, the advantage is that the area between the segment and the end head can be sealed to increase isolation.

  By using different tolerances for different connection points between the distance piece 19 and the segments 17, 18, the relative movement between the segments 17, 18 and the end heads 5, 6 can be controlled to some extent. become.

Claims (13)

Yankee cylinder (1) for drying a cellulosic material web (W),
A cylindrical shell (2) having a substantially cylindrical outer surface and two axial ends (3, 4);
End heads (5, 6) positioned at each of the axial ends (3, 4) of the cylindrical shell (2) and having a flat outer surface, each comprising the cylindrical shell (2 ) And an end head (5, 6) having a circular outer periphery (11) fixed to the cylindrical shell (2) by welding so as to define an internal space (8) of the Yankee cylinder (1). ,
A support journal (12, 13), wherein the Yankee cylinder (1) is rotatable around a rotation axis (R) when the support journal (12, 13) is supported by a bearing. A support journal (12, 13) fixed to each end head (5, 6) of (1);
A heat insulating part (16) connected to each end head (5, 6), wherein the heat insulating part (16) on each end head (5, 6) has a plurality of divided segments (17, 18). And a plurality of the divided segments (17, 18) distributed in the end head (5, 6) in the circumferential direction so as to cover the end head (5, 6). ) And
Each end head has a region of the end head (5, 6) located between the circular outer periphery (11) of the end head (5, 6) and the support journal (12, 13). There are a plurality of separate distance pieces (19) arranged at a distance from each other such that the separate distance pieces (19) are spaced apart from each other and protrude from the end heads (5, 6). It is fixed to the end head (5, 6), and each segment (17, 18) is held by the distance piece (19) at a position spaced from the end head (5, 6). And a Yankee cylinder (1) fixed to at least two distance pieces (19).   The divided segments (17, 18) are divided into a first divided segment (17) group arranged at a radially inner position with respect to the support journal (12, 13), and the support journal (12, 13). 2. The Yankee cylinder (1) according to claim 1, wherein the Yankee cylinder (1) is divided into a second group of divided segments (18) arranged at positions radially outward relative to the second group.   The Yankee cylinder (1) according to claim 2, wherein the divided segments (17) in the first group of divided segments are fixed to the support journal (12, 13) at the radially innermost edge. ). Each divided segment (17) belonging to the first group has a degree of freedom in which the divided segment (17) is relatively movable in the radial direction and the divided segment (17) is moved inward from the radially outer side. It is fixed to the support journal (12, 13) and the end head (5, 6) so as to be higher,
Each divided segment (18) belonging to the second group has a degree of freedom in which the divided segment (18) is relatively movable in the radial direction and the divided segment (18) is moved outward from the radially inner side. Yankee cylinder (1) according to claim 3, wherein the Yankee cylinder (1) is fixed to the end head (5, 6) so as to be higher.   Yankee cylinder (1) according to claim 4, wherein the split segments (17, 18) have side flanges (23, 24) extending towards the end heads (5, 6).   A curved flange (24) is welded to the radially outermost edge of each divided segment (18) belonging to the second divided segment group, and the curved flange (24) is connected to the end head (5). 6) The Yankee cylinder (1) according to claim 5, which extends towards 6). Each distance piece (19) has a hole (44) with an internal thread (45) at an end contacting with each divided segment (17, 18), and the divided segment (17, 18) is connected to the distance piece (17, 18). 19) has a through hole of a size that cannot pass,
A threaded bolt (30) extends through the through hole in the split segment (17, 18) and into the internal thread (45) of the distance piece (19), whereby the split segment (17, 18). The Yankee cylinder (1) according to claim 1, wherein is fixed to the distance piece (19). Each divided segment (17, 18) is fixed to a plurality of distance pieces (19), and said divided segment (17, 18) is attached to each distance piece (19) by a threaded bolt (30) and a washer (35). The washer (35) is fixed and acts as a spacer between the head (31) of the bolt (30) and the outer surface of the split segment (17, 18), and the washer (35) An extension for forming a bushing (36) for the threaded bolt (30) and centering the shaft (32) of the threaded bolt (30) within the through-hole of the segment (17, 18); The bushing (36) includes the split segments (17, 18), the distance piece (19) and the corresponding threaded bolt And (30), so they can be moved relative fitted in the through hole remembering tolerance,
For the selected distance piece (19), the washer (35) used to connect the selected distance piece (19) to the threaded bolt (30) is connected to another threaded bolt (30 ) With a smaller tolerance than the bushing (36) used for this, so that the split segments (17, 18) and the selected distance piece (19) and The relative movement between the corresponding threaded bolts (30) is more constrained than for other distance pieces (19) to which the split segments (17, 18) are fixed. Yankee cylinder (1) as described.   The divided segments (17, 18) are made of sheet metal, and each of the divided segments (17, 18) is formed on the side of the divided segments (17, 18) facing the end heads (5, 6). The Yankee cylinder (1) as claimed in claim 1, wherein the Yankee cylinder (1) is fixed to the end head (5, 6) and is secured to the thermal insulation sheet (38).   The Yankee cylinder (1) according to claim 9, wherein the thermal insulation sheet (38) comprises aluminum.   The divided segments (17, 18) are adjacent to each other except that they are indirectly connected via the common end head (5, 6) or support journal (12, 13). The Yankee cylinder (1) according to claim 1, which is separated from each other so as not to be connected to each other.   A manhole (40) is disposed in at least one of the end heads (5, 6), and the manhole (40) is located on the back side of the divided segment (18) in the second divided segment group. Yankee cylinder (1) according to claim 2.   Each divided segment (17, 18) covers the part of the end head (5, 6) from each support journal (12, 13) to the outer peripheral part (11) of the end head (5, 6). The Yankee cylinder (1) according to claim 1, which extends as follows.

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