FI104281B - The shoe roll - Google Patents

Description

, 104281

The shoe roll.

The present invention relates to a shoe roll for a paper, board, pulp drying or post-processing machine comprising a massive stationary roller shaft 5, a substantially resilient roller sheath rotatable about the roller shaft, and comprising a load assembly located on the roller shaft, one or more elements, and can be loaded toward the backing roll to form a nip. One particular object of the invention is a shoe roll of a long nip press of a paper, board, pulp drying or finishing machine comprising 10 massive stationary roll shafts, a substantially elastic roll sleeve rotatably arranged around the roll shafts, and a plurality of roll shafts elements, and can be loaded toward the backing roll to form a nip.

15 These types of shoe rolls have been proposed for use, e.g. with a press section in a pit nip press, as well as a carrier roll for web winder carrier rollers, as well as for paper calendering, a corresponding roll could be envisaged.

Known long nip press shoe rollers having a resilient roller sheath, known as a belt or sock, rotatably mounted around a stationary roll 20 shaft and an oil-loaded load shoe (s) fitted thereto, if desired, remove the said roll. roll with a machine, it has to be done with at least two steps with current roll structures. The belt must first be removed from the roll while the roll is still in the machine and only then can the roll be lifted, since lifting the roll from the belt is not possible with known rolls. Similarly, during installation, a prior art roller is mounted without a belt, and then the belt is separately installed.

Thus, it is a primary object of the present invention to provide a shoe roll which allows lifting of a roll without removing the Belt from the roll prior to lifting or then lifting the roll after the Belt is mounted.

2 104281

To achieve the above objects, the shoe roll of the invention is characterized in that one or more support members supported on the roll 5 axle are provided on the inside of the sheath to support the shoe internally during non-normal handling of the shoe, such as lifting;

The shoe roll of the long nip press according to the invention is characterized in that one or more support members supported on the roll shaft are provided on the inside of the diaper to support the shoe internally during non-normal handling of the shoe, such as lifting;

The roll of the invention can thus be lifted with the Belt in place, whereby the change of the thrower can be done outside the machine if desired. This may be the case, for example, when the roll is a press roll hs. position above. In rebuilds, the roll can be equipped with a belt if desired, in advance of the roll assembly, which saves the roll installation time and short machine downtime. In such situations, large paper machines can save time of up to 10-15 hours, which can mean, for example, avoiding production losses of up to FIM 1 million.

Thus, the invention achieves advantages particularly with large, heavy, high-power rollers, such as shoe press rolls (long nip press) used on a press section of a papermaking machine or the like.

According to a preferred embodiment of the invention, a support member is provided on the inside of the diaper at least two longitudinal lifting points of the shoe roll during internal lifting of the shoe roll by the support straps to support the sheath.

3, 104281

Some preferred embodiments of the invention are set forth in dependent claims 2-8.

The invention will now be described in more detail with reference to the accompanying drawings, in which:

Fig. 1 schematically shows a shoe roll of a long nip press during lifting step; Fig. 2A shows an embodiment of a shoe roll according to the invention in a schematic cross-section with the roll in normal running condition,

Figure 2B illustrates the embodiment of Figure 2A in a roll lift situation, 15

Figures 3A and 3B illustrate another embodiment of the invention in normal roll running condition and roll lifting, respectively, and Figure 4 illustrates another preferred embodiment of a shoe roll in accordance with the invention.

In Figure 1, the shoe roller 1 of the long nip press is supported by the wide lifting straps 9 around the roll shell, which lift straps 9 are fastened to the lifting device 8. The roll is supported at its outside end by a lifting rope 13 At its inner end, the roll 1 is supported on a third wide lifting belt 10 around the roll casing connected to a lifting aid 11 on the support beam 12 at the top of the machine. Reference numeral 2 denotes a counter roll of shoe roll 1 which together with the shoe roll 1 The lifting belts 9 and 10 typically have a width of about 300 mm.

4, 104281

In the embodiment of Fig. 2A, stationary massive roller shafts 4 of the shoe roll 1 are provided with, for example, hydraulically or pneumatically expandable support members 6, whose ends facing the inner surface of the roll shell 7 are preferably provided with curved support surfaces 5. 2B, in the lifting position of the shoe roll 1 shown in Fig. 2B, the support surfaces 5 are displaced by the expansion elements 6 against the inner surface of the roll shell 7, whereby the lifting ropes can be positioned at the support surfaces 5 and roll 1 can be lifted

10

The embodiment of Figures 3A and 3B differs from the embodiment shown in Figures 2A and 2B in that the expansion member 6 is integral and directly against the inner surface of the roll shell 7 without separate support surfaces 5.

As shown in Figure 4, the shoe roll of the long nip press according to the invention can also be implemented by mechanically securing the support surfaces 5 with a fixed support member 6 to the roll shaft 4 at a certain distance from the inner surface of the roll shell 7. In this case, the distance between the support surface and the sheath is preferably selected so that when the roll is lifted, the surface of the sheath does not bend excessively during lifting, and in normal use the clearance 20 is sufficient to avoid premature internal wear. In this embodiment, the support surface may also be continuously lubricated with a lubricating oil film. The distance of the support surface from the inner surface of the roll shell 7 is preferably 0 to about 50 mm, more preferably 5 to 20 mm.

The support surface may also be mechanically pivotally mounted on the roll shaft 4, allowing the support surfaces to be pivoted from a retracted position during normal running of the roll to a position in or near the inner surface of the roll shell during lifting. The support surface is preferably smooth and slightly rounded at the edges.

Preferably, the support surfaces have a width of about 200 to 600 mm, and more preferably about 200 to 400 mm. Preferably, the number of lifting belts is at least two and the supporting members 104281 5 are respectively at least two positioned at each lifting belt. Preferably, the maximum useful number of nos straps and support members is three, although more may be used, but in normal cases three are sufficient. A similar property can also be obtained by positioning the support surfaces over substantially the entire dimension of the massive stationary roll axis, whereby the support member is preferably made of a material lighter than the roll axis (density) or otherwise lighter (such as more affordable e.g. material saved and lower total weight.

10

Thus, one important advantage of the invention is the considerable time savings in installing the roll when the Belt is pre-installed on the roll outside the machine. Time savings can be in the order of 10-15 hours.

Although the invention is described in this application in connection with a long nip press, and although it is a particularly advantageous application for the invention, the inventive idea can be applied to similar rolls for other applications.

Claims (9)

104281 A shoe roll (1) for a paper, board, pulp drying or finishing machine comprising a massive stationary roll shaft (4), a substantially resilient roll shell (7) arranged to rotate about the roll axis, and a roll shaft (7). 4) positioned loading apparatus (3) which can be loaded towards the counter roll (2) for forming a nip (N), characterized in that one or more support means (5,6) for the roll mantle are provided on the inside of the jacket (7); (7) for internal support during non-normal handling, such as lifting, of a shoe roll. Shoe roll according to Claim 1, characterized in that the support members include a support surface (5) which can be mechanically, hydraulically or pneumatically brought against or near the inner surface of the roll shell, wherein the roll (1) can be lifted when the shell is in place. 3. claimed in claim 1 as a shoe roll, characterized in that the support means consist of several, preferably 2-3 to roll toward the longitudinal placed in a separate element, wherein the shell elements into the clearance between the inner roll 20, the inner side surfaces is substantially less than in the regions between the elements. Shoe roll according to Claim 3, characterized in that the roll of each support surface (5) has a longitudinal width of about 200 to about 600 mm, preferably about 200. 400mm. 25 Shoe roll according to Claim 1, characterized in that the support members include a support (6) which is hydraulically or pneumatically expandable against or in the vicinity of the inner surface of the roll shell, wherein the roll (1) can be lifted in place. 30 104281 Shoe roll according to Claim 1, characterized in that the support means comprise at least one support piece fixed at a certain distance from the inner surface), wherein the roll (1) can be lifted with the diaper in place. Shoe roll according to Claim 6, characterized in that the support surface of the solid support body is about 0 to about 50 mm, preferably about 5 to about 20 mm, from the inner surface of the roll diaper (7). Shoe roll according to Claim 1, characterized in that the support members consist of one support member extending substantially over the entire length of the massive stationary roll axis, the support member being preferably made of a material lighter than the roll axis or otherwise lighter. A longitudinal nip press shoe roll (1) for a paper, board, pulp drying or finishing machine comprising a massive stationary roll shaft '(4), a substantially flexible roll shell 20 (7) arranged to be rotatable about the roll axis, and 4) positioned loading apparatus (3) which can be loaded towards the counter roll (2) for forming a nip (N), characterized in that one or more support means (5,6) for the roll mantle are provided on the inside of the jacket (7); (7) for internal support during handling of a shoe roll outside normal production, such as lifting. 104281