Method for producing a large cylinder drying roller

Abstract

A method for manufacturing a large-cylinder drying roller includes providing a cylindrical cylinder shell having two sides, initially attaching a respective cap to each of the sides of the cylinder shell, subsequently inserting an inner shaft coaxially within the cylinder shell and connecting the inner shaft to the caps and connecting journals to the inner shaft. The inner shaft is divided into two inner-shaft parts. Each inner-shaft part is inserted from a respective side and then each of the inner-shaft parts is connected to the other of the inner-shaft parts and to a respective one of the caps and/or prior to inserting the inner shaft, the cylinder shell and the caps are relieved of stress and the connection of the cylinder shell and the caps is checked from the inside or the cylinder shell and/or the caps are mechanically processed together.

Claims

1. In a method for manufacturing a large-cylinder drying roller which includes: providing a cylindrical cylinder shell having two sides; initially attaching a respective cap to each of the sides of the cylinder shell; subsequently inserting an inner shaft coaxially within the cylinder shell and connecting the inner shaft to the caps; and connecting journals to the inner shaft, the improvement comprising: dividing the inner shaft into two inner-shaft parts; and at least one of: inserting each inner-shaft part from a respective side and then connecting each of the inner-shaft parts to the other of the inner-shaft parts and to a respective one of the caps or prior to inserting the inner shaft, stress-relieving the cylinder shell and the caps and at least one of checking the connection of the cylinder shell and the caps from the inside or mechanically processing the cylinder shell and the caps together.

2. The manufacturing method according to claim 1, which further comprises providing the inner shaft as a divided hollow shaft having two hollow-shaft parts connected by a hollow-shaft connection lying radially in an interior of the hollow shaft, and closing the hollow-shaft connection after insertion of the two hollow-shaft parts of the hollow shaft.

3. The manufacturing method according to claim 2, which further comprises closing the two hollow-shaft parts of the hollow shaft after closing the hollow-shaft connection.

4. The manufacturing method according to claim 1, which further comprises not annealing the large-cylinder drying roller after the insertion step until being commissioned.

5. The manufacturing method according to claim 1, which further comprises performing at least one of mechanical processing or checking of the connection between the caps and the cylinder shell through at least one of central cap openings or hollow-shaft openings.

6. The manufacturing method according to claim 1, which further comprises after insertion of the inner shaft attaching functional groups at least one of in an interior of the cylinder shell or to the inner shaft.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

(1) Further advantages, objectives, and properties of the present invention will be explained by means of the following description of exemplary embodiments which in particular are also illustrated in the appended drawing, in which:

(2) FIG. 1 schematically shows a section through a large-cylinder drying roller, along the line I-I in FIG. 2;

(3) FIG. 2 shows the drying roller according to FIG. 1 in a side view;

(4) FIG. 3 shows the large-cylinder drying roller according to FIGS. 1 and 2, prior to the inner shaft being inserted; and

(5) FIG. 4 shows an enlargement of the detail IV in FIG. 3.

DETAILED DESCRIPTION OF THE INVENTION

(6) Large-cylinder drying roller 10 illustrated in the figures is composed of a cylindrical cylinder shell 20, two caps 31, 32 which are attached to both sides of the cylinder shell, an inner shaft 50 which is coaxially disposed within the cylinder shell 20, and two journals 41, 42 which are provided on the inner shaft 50 which in turn is connected to the caps 31, 32.

(7) The caps 31, 32 here are in each case welded to the cylinder shell 20, as can be seen in particular in FIG. 4, wherein in this exemplary embodiment a weld seam 34 which is mechanically processed on both sides is provided, on account of which tensions and stress concentrations in the zone which is influenced by welding may be minimized.

(8) The cylinder shell 20 moreover has grooves 22 and webs 23 which are known per se and by way of which condensate is selectively trapped in a manner known per se and may be evacuated by way of assemblies which are known per se but not illustrated here.

(9) In the present exemplary embodiment the weld seam 34 lies between the caps 31, 32 and the cylinder shell 20, in a region between the caps 31, 32 and the cylinder shell 20 that extends in a perpendicular manner to the roller axis 15, wherein other design embodiments of the transition between the caps 31, 32 and the cylinder shell 20 are also conceivable or are already known from the prior art, respectively, for example also in a region which is provided to be perpendicular to the former region as a region which extends parallel with the roller axis 15, without the advantages in terms of the manufacturing and the specific design embodiment of the large-cylinder drying roller 10 as explained above and in the following being compromised thereby.

(10) Manholes 38, which are already known per se, through which the interior 25 of the cylinder shell 20 may be reached even after assembly of the large-cylinder drying roller 10, are provided in the caps 31, 32. Manholes for getting to the interior 65 of the hollow shaft 60 may optionally also be provided in the cylindrical wall of the inner shaft 50 when the inner shaft 50 as in the present exemplary embodiment is configured as a hollow shaft 60. Manholes of this type may be provided for example on cap-connection flanges 67, 68 of the hollow shaft 60 or else also in the cylindrical wall of the hollow shaft 60. It is likewise conceivable for a manhole of this type to be provided on an inner wall 69 of the hollow shaft 60 when the hollow shaft 60, as in this exemplary embodiment, or the inner shaft 50, respectively, is divided into two hollow-shaft parts 61, 62, or inner-shaft parts 51, 52, respectively.

(11) In the present exemplary embodiment, separate holes by way of which the interior 65 of the hollow shaft 60 may be reached are not required per se, since in this exemplary embodiment the journals 41, 42 in each case close central hollow-shaft openings 64 which are in each case disposed in the cap-connection flanges 67, 68, so that the interior 65 of the hollow shaft 60 may be reached through the central hollow-shaft openings 64. The latter is difficult when the journals 41, 42 have been inserted and the large-cylinder drying roller 10 is mounted in its bearings, as this would mean a complete removal. To this end, separate manholes which not only enable access to the interior 65 of the hollow shaft 60 or of the respective hollow-shaft part 61, 62, but also access to the interior 25 of the cylinder shell 20 and of the 65 of the other hollow-shaft parts 61, 62, when further manholes are provided in the walls of the hollow shaft 60 or of the hollow-shaft parts 61, 62, for example in the cylindrical wall or the inner walls 69, may also be provided in the cap-connection flanges 67, 68.

(12) Both caps 31, 32 in the present exemplary embodiment have in each case one radial inner side 35 and radial outer side 36 which are mutually spaced apart by an extent H. The extent H in this exemplary embodiment is selected to be 800 mm, so that the manholes 38 may be configured to be of sufficient size. The extent H also in other exemplary embodiments is preferably selected to be between 900 mm and 700 mm, so that here too sufficient space remains for manholes 38 and it is ensured that the radius of the respective central cap opening 37 of the caps 31, 32 remains sufficiently large for machine parts, mechanical machining centers, and testing installations to be able to be brought into the interior 25 of the cylinder shell 20 in an operationally safe manner, so as for the necessary tasks to be able to be completed in an operationally safe manner also working from the inside out, or on the inner side of the construction composed of the cylinder shell 20 and the caps 31, 32, respectively.

(13) In order for the large-cylinder drying roller 10 to be manufactured, the functional groups which are separately illustrated in FIG. 3 are initially provided separately. In particular, the caps 31, 32 are initially connected to the cylinder shell 20.

(14) Subsequently thereto, mechanical processing of the raw-state contour 18 composed of the caps 31, 32 and the cylinder shell 20 takes place (cf. FIG. 4), in that the material of the raw-state contour 18 is subtracted by suitable mechanical machines, and the construction composed of the cylinder shell 20 and the caps 31, 32 is mechanically shaped. In this method step, in particular the grooves 22 and the webs 23 and optionally other mechanical design features are machined from the raw-state contour 18. The surface of the cylinder shell 20 is likewise processed to a corresponding dimension in terms of its circularity. Moreover, the weld seam 34 is mechanically processed on both sides, as has been explained above.

(15) Depending on the specific method management, annealing of the entire construction is performed prior to mechanical processing, so that any warping or the consequences thereof may be removed by mechanical processing. As long as the hollow shaft 60 has not been inserted, checking of the weld seams 34 and of further parameters may likewise be readily performed. It is also conceivable for complementary functional groups to be incorporated in the interior 25 of the cylinder shell 20 at this point in time.

(16) Subsequent thereto, the two hollow-shaft parts 61, 62 are introduced from both sides in each case into the construction composed of the cylinder shell 20 and the caps 31, 32, wherein for this purpose all functional groups 73 of the hollow shaft 60 or of the hollow-shaft parts 61, 62 are disposed so as to be radially within part-cylinders 71, 72 which are defined by the respective cap-connection flanges 67, 68 (cf. FIG. 3) or radially within a cylinder 70 which is defined by the two cap-connection flanges 67, 68 (cf. FIG. 1), so that insertion may be readily performed. Any functional groups which are connected to the hollow-shaft parts 61, 62 and radially protrude beyond the part-cylinders 71, 72, or beyond the cylinder 70, respectively, may optionally be retro-fitted after the hollow-shaft parts 61, 62 have been inserted.

(17) As has already been explained, each hollow-shaft part 61, 62 has an inner wall 69 which are axially disposed in the interior 25 of the cylinder shell 20 and constitute parts of a hollow-shaft connection 63 or of an inner-shaft connection 53 in that the inner walls 69 of the two hollow-shaft parts 61, 62 for connecting the hollow-shaft parts 61, 62, or the inner-shaft parts 51, 52, respectively, are interconnected by way of connection elements which in this exemplary embodiment are screws.

(18) After insertion the cap-connection flanges 67, 68 are also connected to the caps 31, 32, this in the case of this exemplary embodiment likewise being performed by screws.

(19) The interior 65 of the hollow shaft 60 may still be reached through the central hollow-shaft opening 64, in order for the hollow-shaft connection 63 or the inner-shaft connection 53, respectively, to be manipulated, on the one hand, or for other constructive measures to be performed there, on the other hand.

(20) Subsequently thereto, the journals 41, 42 are inserted into the central hollow-shaft opening 64 so that the hollow shaft 60 is closed off on account thereof. The journals 41, 42, in a manner known per se, are configured so as to be hollow so that by way of the latter the interior 65 of the hollow shaft 60 may be reached in a manner known per se.

(21) In the case of this exemplary embodiment the journals 41, 42 are likewise screwed to the cap-connection flanges 67, 68, wherein in a modified embodiment it is conceivable here for a weld connection, for example spot welding or else an encircling weld connection, to be provided, since the total introduction of energy at this point if and when applicable may be sufficiently controlled and any distortion worth mentioning is not to be expected here under certain circumstances. Other types of connections are likewise conceivable at this point.

(22) The following is a summary list of reference numerals and the corresponding structure used in the above description of the invention: 10 Large-cylinder drying roller 15 Roller axis 18 Raw-state contour 20 Cylinder shell 22 Groove (identified in an exemplary manner) 23 Web (identified in an exemplary manner) 25 Interior of the cylinder shell 20 31 Cap 32 Cap 34 Weld seam 35 Radial inner side 36 Radial outer side 37 Central cap opening 38 Manhole 41 Journal 42 Journal 50 Inner shaft 51 Inner-shaft part 52 Inner-shaft part 53 Inner-shaft connection 60 Hollow shaft 61 Hollow-shaft part 62 Hollow-shaft part 63 Hollow-shaft connection 64 Central hollow-shaft opening 65 Interior of the hollow shaft 60 67 Cap-connection flange 68 Cap-connection flange 69 Inner wall 70 Cylinder 71 Part-cylinder 72 Part-cylinder H Extent