EP3017111B1 - Large drying cylinder and method for producing a large drying cylinder - Google Patents

Description

The invention relates to a large-cylinder drying roller according to the preamble of claim 1. Also, the invention relates to a method for producing such a large-cylinder drying roller.

Such large-cylinder drying rollers are for example from the EP 2 385 171 B1 or from the US 3,061,944 or from the US2,328,321 Known, where they usually - depending on the application - Yankee roll in the production of tissue paper or tissue papers or soft papers, MG-rolls ( machine glazed ) in the production of machine-smooth papers or drying cylinders in the production of cardboard papers or be called graphical papers. Corresponding large-cylinder drying rollers can be heated, which can be done by, for example, introduced into the large cylinder drying roller steam. It is understood that - depending on the concrete implementation - other related energy sources can be used.

Here, in such large-cylinder drying rollers to compromise between the strength, in particular with regard to the connection between the cover and cylinder jacket, and manufacturing facilities, as in particular a concentricity must be ensured even after any welding, which must be taken into account that such large-cylinder drying rollers cylinder diameter of 5 m and more and cylinder widths of 7 m and more and the masses of such cylinders can exceed 90 t.

In the course of this compromise, the EP 2 385 171 B1 before, first to connect the cylinder jacket with the two covers, preferably to weld, because then the interior of the large cylinder drying roller is still easily accessible and appropriate work inside are easy to carry out. Only then will this be the one-piece Inner shaft inserted through openings of the lid in the construction of covers and cylinder jacket and connected to the covers.

It is an object of the present invention to provide a production, functional, and cost-optimized design of such large-cylinder drying rollers.

As a solution, a large-cylinder drying roller having the features of claim 1 and a method for producing a large-cylinder drying roller having the features of claim 6 are proposed. Further advantageous embodiments can be found in the subclaims and the following description.

In this case, this solution is based on the common inventive basic idea of prefabricating the large-cylinder drying roller initially in small but as complete as possible structural units, which are in each case subjected to individually uniform production steps, and then to connect them first. So then a construction of cylinder jacket and lids can be machined separately and also treated thermally. Likewise, hollow shaft parts can already be prepared in smaller units, before then the entire large cylinder drying roller is assembled.

So follows a production, function and cost-optimized design, if in a method for producing a large cylinder drying roller, which at least from a cylindrical cylinder jacket, two on both sides of the cylinder jacket attached lids, from a coaxially disposed inside the cylinder jacket inner shaft and two indirectly About the inner shaft connected to the lids or provided directly on the lids pin, first the cylinder jacket and the lid are connected to each other and then inserted the inner shaft and connected to the lids, wherein the inner shaft is formed divided and for insertion from both sides depending used an inner shaft part and the inner shaft is then connected in itself and with the lids. This results in comparison with the procedure, as described in the EP 2 385 171 B1 is shown, the advantage that not the entire inner shaft over its entire length must be passed through the entire large cylinder drying roller, which in itself requires a lot of space, and manufacturing technology is extremely expensive.
According to the invention, the inner shaft is a hollow shaft divided into at least two hollow shaft parts, and the two hollow shaft parts are connected or connectable via a hollow shaft connection which is accessible from the interior of the hollow shaft. Such a configuration makes it possible to connect the split hollow shaft from the inside out to a hollow shaft, which is much simpler in terms of design and production technology than if such a connection has to be closed from the outside before the hollow shaft is inserted into the cover and cylinder jacket construction can.

Preferably, after the onset of the inner shaft, the drying roller is no longer annealed until it is put into operation, so that the corresponding dimensional accuracy remains. Likewise, preferably larger welding work, which require a significant energy input, no longer performed. It is understood that welding in radially inner areas as well as spot or tack welds can certainly still be carried out, as or if they do not adversely affect the concentricity properties.

In concrete embodiments, the pins may for example be integrally formed with the lids. However, this will usually be the case only for smaller large cylinder drying rollers. It is also conceivable, the pin integral with the hollow shaft train as exemplified in the EP 2 385 171 B1 or in the US 3,061,944 is disclosed. Also, the pins can be attached as separate assemblies to the lid, as this also in the EP 2 385 171 B1 , and there as prior art, is shown.

Preferably, however, at least one of the hollow shaft parts is closed by a pin, so that activities inside the hollow shaft, for example a closing of the hollow shaft connection after insertion of the hollow shaft parts are readily possible.

Accordingly, it is advantageous in terms of the manufacturing process, when the two hollow shaft parts of the hollow shaft are closed after closing the hollow shaft connection, for example by the pins are connected to the hollow shaft parts.

As already explained above, it is on the other hand advantageous if a low-stress or relaxing annealing, the examination of the connection between the cylinder jacket and the lid and / or the mechanical processing takes place before the onset of the inner shaft or the hollow shaft. This leaves in particular enough room for the fact that the mechanical processing or the examination of the connection between the cover and cylinder jacket can be done through central lid and / or hollow shaft openings therethrough. In particular, it is possible to introduce through these openings through mechanical machining centers in the interior of the cylinder jacket, so that a mechanical processing can be carried out according to exactly. The same applies to testing apparatus, which can be easily passed through these openings in the interior of the cylinder jacket, so that such tests can be carried out according to accurate and expensive.

It is understood that after the onset of the inner shaft assemblies can still be recognized in the interior of the cylinder jacket and / or on the inner shaft or within the hollow shaft. This applies, for example, condensate drainage or steam nozzles and other structures. However, such assemblies are relatively delicate and easy to handle, so that this can be done easily even when inserted inner shaft.

Preferably, the connection between the cylinder jacket and the covers is welded, in particular by a plurality of weld beads comprehensive annular weld. Such a weld is on the one hand highly durable and dimensionally stable. In addition, if it can be suitably tested, it is also tight, which is particularly advantageous when the large cylinder drying roller is under pressure. Also thermal loads holds a corresponding weld without further notice.

It will be appreciated that other connections provided on the large cylinder dryer roll may also be welded. However, connections that need to be opened for maintenance are preferably bolted.

Accordingly, it is advantageous if the connection of the two inner shaft parts or hollow shaft parts takes place by a screw connection.

A well-stabilized connection - and accordingly a well-stabilized hollow shaft - follows when at least one of the hollow shaft parts has an inner wall, which is part of the hollow shaft connection. Such an inner wall can in particular be aligned perpendicular to the main axis of the large cylinder drying roller and optionally
Also represent a boundary wall, which separates the two hollow shaft parts in the interior, so that the one hollow shaft side can be used as an input for an energy source, such as steam, and the other hollow shaft side as an output.

Preferably, at least one of the lids has a radial extent extending from its radial inner side to its radial outer side of between 600 mm and 1100 mm, preferably between 650 mm and 1000 mm. This requires for a given radius of the cylindrical cylinder jacket as large a lid opening through which then appropriate edits and tests can be carried out easily and reliable inside the construction of cylinder jacket and lid without the lid too small extension for necessary assemblies such
For example, about existing manholes having. In addition, an extension of these dimensions requires the largest possible inner or hollow shaft, which increases the rigidity of the large-cylinder drying roller, and thus the degree of concentricity and also the inherent rigidity of the lid. Depending on the specific situation then correspondingly less massive assemblies can be used.

Under certain circumstances, a manhole can also be provided in a cover connecting flange, by means of which the hollow shaft is connected to one of the covers, so that access to the large cylinder drying roller is possible. This is particularly advantageous if - for whatever reason - in the lid not enough space for a manhole remains. Cumulatively or alternatively for this purpose, for example, a manhole can also be provided in an inner wall of the hollow shaft, so that it is possible to move from one hollow shaft part to another part. Accordingly, it is advantageous if in at least one axial wall of the hollow shaft, so for example in a Deckelverbindungsflansch or in an inner wall but also in any other axial wall of the hollow shaft, a manhole is provided. Possibly. can also be provided in addition to pointing to the cylinder jacket walls of the hollow shaft, so for example in cylindrical walls of the hollow shaft, at least one additional manhole to then reach from the hollow shaft and the interior of the cylinder jacket or vice versa.

Figur 1

einen schematischen Schnitt durch eine Großzylinder-Trockenwalze entlang der Linie I-I in Figur 2;

Figur 2

die Trockenwalze nach Figur 1 in einer Seitenansicht;

Figur 3

die Großzylinder-Trockenwalze nach Figuren 1 und 2 vor dem Einsetzen der Innenwelle; und

Figur 4

den Ausschnitt IV in Figur 3 vergrößert.

Further advantages, objects and features of the present invention will be explained with reference to the following description of exemplary embodiments, which are shown in particular in the appended drawing. In the drawing show:

FIG. 1

a schematic section through a large cylinder drying roller along the line II in Figure 2;

FIG. 2

the drying roller after FIG. 1 in a side view;

FIG. 3

the large cylinder drying roller after Figures 1 and 2 before inserting the inner shaft; and

FIG. 4

the section IV in FIG. 3 increased.

In the figures illustrated large-cylinder drying roller 10 consists of a cylindrical cylinder jacket 20, two on both sides of the cylinder jacket attached lids 31, 32, a coaxially disposed inside the cylinder jacket 20 inner shaft 50 and two pins 41, 42 which are provided on the inner shaft 50, the in turn connected to the covers 31, 32.

Here are, as in particular in FIG. 4 can be seen, the lid 31, 32 respectively welded to the cylinder jacket 20, wherein in this embodiment, a two-sided
mechanically machined weld 34 is provided, which can minimize stresses and notch effect in the affected by the welding zone.

The cylinder shell 20 also has grooves 22 and webs 23 which are known per se, through which condensate can be purposefully intercepted in a manner known per se and can be removed via arrangements known per se but not shown here.

In the present embodiment, the weld 35 is located between the covers 31, 32 and the cylinder jacket 20 in a direction perpendicular to the roll axis 15th extending area between the lid 31, 32 and cylinder jacket 20, wherein other embodiments of the transition between the cover 31, 32 and cylinder jacket 20 conceivable or already known from the prior art, for example, in a direction perpendicular to this area, than in parallel to the roll axis 15 extending area, without the above and below explained advantages in terms of production and specific design of the large cylinder drying roller 10 suffer from this.

In the covers 31, 32 are already known manholes 38 are provided, through which you can get into the interior 25 of the cylinder jacket 20 even after assembly of the large cylinder drying roller 10. Manholes may also be provided in the cylindrical wall of the inner shaft 50, if the inner shaft 50, as in the present embodiment, is designed as a hollow shaft 60 in order to be able to reach the interior 65 of the hollow shaft 60. Such manholes can be provided, for example, on cover connection flanges 67, 68 of the hollow shaft 60 or else in the cylindrical wall of the hollow shaft 60. It is also conceivable to provide such a manhole on an inner wall 69 of the hollow shaft 60 when the hollow shaft 60 - as in this embodiment - or the inner shaft 50 is divided into two hollow shaft parts 61, 62 and inner shaft parts 51, 52.

In the present embodiment, separate holes, with which the interior 65 of the hollow shaft 60 can be achieved, are not necessary, since in this embodiment the pins 41, 42 each have central hollow shaft openings 64 which are respectively arranged in the cover connection flanges 67, 68. close, so that the interior 65 of the hollow shaft 60 can be achieved through the central hollow shaft openings 64. The latter is difficult if the pins 41, 42 used and the large cylinder drying roller 10 is stored in their camps, as this would mean a complete expansion. Then, separate manholes can also be provided in the cover connecting flanges 67, 68, which, if further manholes are provided in the walls of the hollow shaft 60 or the hollow shaft parts 61, 62, for example in the cylindrical wall or the inner walls 69, not only an access in the interior 65 of the hollow shaft 60 and the respective hollow shaft part 61, 62 but also allow access to the interior 25 of the cylinder jacket 20 and 65 of the other hollow shaft parts 61, 62.

In the present embodiment, both covers 31, 32 each have a radial inner side 35 and radial outer side 36, which are spaced apart from each other by an extension H. The extension H is chosen in this embodiment with 800 mm, so that the manholes 38 can be made sufficiently large. Preferably, in other embodiments, the extension H is selected between 900 mm and 700 mm, so that here too enough space for manholes 38 remains and it is ensured that the radius of the respective central lid opening 37 of the lid 31, 32 remains sufficiently large that machine parts , Mechanical machining centers and test equipment can be reliably stored in the interior 25 of the cylinder jacket 20 can be used to meet the necessary tasks even from the inside or on the inside of the construction of cylinder jacket 20 and cover 31, 32 reliable.

For the production of the large cylinder drying roller 10 are first in FIG. 3 separately provided assemblies. In particular, the covers 31, 32 are first connected to the cylinder jacket 20.

This is followed by the mechanical processing of the raw contour 18 from cover 31, 32 and cylinder jacket 20 (see FIG. 4 ), by removing the material of the rough contour 18 by suitable mechanical machines and the construction of cylindrical shell 20 and
Cover 31, 32 is brought into its mechanical form. In particular, in this method step, the grooves 22 and webs 23 and, if appropriate, other mechanical configurations are machined out of the rough contour 18. Likewise, the surface of the cylinder jacket 20 is brought to a degree appropriate to its roundness. In addition, the weld 34 is machined on both sides, as already explained above.

Depending on the specific process control, annealing of the overall construction takes place before the mechanical processing, so that any distortion or its consequences can be eliminated by the mechanical processing. Likewise, as long as the hollow shaft 60 is not used, a check of the welds 34 and other parameters can be carried out easily. It is also conceivable that supplementary assemblies are introduced into the interior 25 of the cylinder jacket 20 at this time.

Following this, the two hollow shaft parts 61, 62 introduced from both sides in each case in the construction of cylinder jacket 20 and cover 31, 32, for which all assemblies of the hollow shaft 60 and the hollow shaft parts 61, 62 radially within by the respective Deckelverbindungsflansche 67, 68 defined sub-cylinders 71, 72 (see FIG. 3 ) or radially within a defined by the two Deckelverbindungsflansche 67, 68 cylinder 70 (see FIG. 1 ) are arranged, so that insertion without problems can be done. Any assemblies which are connected to the hollow shaft parts 61, 62 and project radially beyond the sub-cylinders 71, 72 or over the cylinder 70, can optionally be nachmontiert after insertion of the hollow shaft parts 61, 62.

As already explained, each hollow shaft part 61, 62 has an inner wall 69, which are arranged axially in the interior 25 of the cylinder jacket 20 and form parts of a hollow shaft connection 63 or an inner shaft connection 53, by the inner walls 69 of the two hollow shaft parts 61, 62 via connecting elements , which are screws in this embodiment, for connecting the hollow shaft parts 61, 62 and the inner shaft parts 51, 52 are connected to each other.

After insertion, the Deckelverbindungsflansche 67, 68 are connected to the covers 31, 32, which also takes place in this embodiment by screws.

Through the central hollow shaft opening 64, the interior 65 of the hollow shaft 60 can still be achieved in order to manipulate the hollow shaft connection 63 or the inner shaft connection 53 on the one hand or to carry out other structural measures there on the other hand.

Following this, the pins 41, 42 are inserted into the central hollow shaft opening 64, so that the hollow shaft 60 is thereby closed. The pins 41, 42 are hollow in a conventional manner, so that in this case still the interior 65 of the hollow shaft 60 can be achieved in a conventional manner.

In this embodiment, the pins 41, 42 are also bolted to the Deckelverbindungsflanschen 67, 68, wherein it is conceivable in a modified embodiment, here a welded joint, for example, a spot weld or a circumferential weld provided, since the total energy input at this point may be sufficient can be controlled and a significant delay under certain circumstances is not to be expected here. Likewise, other types of connections are conceivable at this point. LIST OF REFERENCE NUMBERS 10 United cylinder drying cylinder 51 Inner shaft part 15 roll axis 52 Inner shaft part 18 rough contour 53 Inner shaft connection 20 cylinder surface 60 hollow shaft 22 Groove (numbered as an example) 61 Hollow shaft part 23 Bridge (numbered as an example) 62 Hollow shaft part 25 Inside of the cylinder jacket 20 63 Hollow shaft connection 31 cover 64 central hollow shaft opening 32 cover 65 Interior of the hollow shaft 60 34 Weld 67 Deckelverbindungsflansch 35 radial inside 68 Deckelverbindungsflansch 36 radial outside 69 inner wall 37 central lid opening 70 cylinder 38 manhole 71 partial cylinder 41 spigot 72 partial cylinder 42 spigot H extension 50 inner shaft

Claims (10)

1. Large-cylinder drying roller (10) in the form of a Yankee roller or an MG roller, at least composed of a cylindrical cylinder sleeve (20), of two caps (31, 32) which are attached on both sides of the cylinder sleeve (20), of an inner shaft (50) which is coaxially disposed within the cylinder sleeve (20), and of two journals (41, 42) which are provided indirectly by way of the inner shaft (50) which is connected to the caps (31, 32) or are provided directly on the caps (31, 32), wherein the inner shaft (50) is a hollow shaft (60) which is divided into at least two hollow-shaft parts (61, 62), characterized in that the two hollow-shaft parts (61, 62) are interconnected or interconnectable, respectively, by way of a hollow-shaft connection (63) which is accessible from the interior (65) of the hollow shaft (60).
2. Large-cylinder drying roller (10) according to Claim 1, characterized in that at least one of the hollow-shaft parts (61, 62) is closed off by a journal (41, 42).
3. Large-cylinder drying roller (10) according to Claim 1 or 2, characterized in that at least one of the hollow-shaft parts (61, 62) has an inner wall (69) which is a component part of the hollow-shaft connection (63).
4. Large-cylinder drying roller (10) according to one of Claims 1 to 3, characterized in that at least one of the caps (31, 32) has a radial extent (H), extending from the radial inner side (35) of said cap up to the radial outer side (36) of said cap, of between 600 mm and 1100 mm, preferably between 650 mm and 1000 mm.
5. Large-cylinder drying roller (10) according to one of Claims 1 to 4, characterized in that a manhole (38) is provided in at least one of the caps (31, 32) and/or in at least one axial wall of the hollow shaft (60).
6. Method for manufacturing a large-cylinder drying roller (10) in the form of a Yankee roller or an MG roller at least composed of a cylindrical cylinder sleeve (20), of two caps (31, 32) which are attached on both sides of the cylinder sleeve (20), of an inner shaft (50) which is coaxially disposed within the cylinder sleeve (20), and of two journals (41, 42) which are provided indirectly by way of the inner shaft (50) which is connected to the caps (31, 32) or are provided directly on the caps (31, 32), wherein the inner shaft (50) is a divided hollow shaft (60), the two hollow-shaft parts (61, 62) of which are connected by a hollow-shaft connection (63) which radially lies in the interior (65) of the hollow shaft (60), in which method initially the cylinder sleeve (20) and the caps (31, 32) are interconnected and subsequently in each case one hollow-shaft part (61, 62) is inserted from both sides and then the inner shaft (50) is connected within itself and to the caps (31, 32), wherein the hollow-shaft connection (63) is closed from the interior of the hollow shaft after insertion of the two hollow-shaft parts (61, 62) of the hollow shaft (60).
7. Manufacturing method according to Claim 6, characterized in that the two hollow-shaft parts (61, 62) of the hollow shaft (60) are closed after closing of the hollow-shaft connection (63) by connecting the journals to the hollow-shaft parts.
8. Manufacturing method according to one of Claims 6 to 7, characterized in that after insertion of the inner shaft (50) the large-cylinder drying roller (10) is not annealed any more until being commissioned.
9. Manufacturing method according to one of Claims 6 to 8, characterized in that mechanical processing and/or checking of the connection between the caps (31, 32) and the cylinder sleeve (20) is performed through central cap openings before insertion of the inner shaft (50).
10. Manufacturing method according to one of Claims 6 to 9, characterized in that after insertion of the inner shaft (50) functional groups are attached in the interior (25) of the cylinder sleeve (20) and/or to the inner shaft (50).

Images