FI74067B - VALS I PAPPERSMASKIN, VILKEN VALS HAR EN PROFILREGLERBAR MANTEL. - Google Patents

Description

74067 Ί Paper machine roll with profile adjustable jacket

Vals i pappersmaskin, vilken Vale har en profilreglerbar mantel

The invention relates to a roll with a deflection profile of a paper machine, in particular a press roll, a calender roll or a coating agent roll, comprising a fixed roll shaft and a substantially cylindrical jacket rotatably mounted thereon.

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Paper machines use a number of rolls formed with a counter roll of a dewatering press nip, a leveling nip or a calendering nip. For these applications, it is important that the nip line pressure in the axial direction of the distribution or profile rolls remains constant or that this profile is adjustable as desired, for example to control the transverse moisture profile and / or thickness profile of the web. For this purpose, various deflection-adjusted or deflection-compensated rollers are already known, which aim to influence the distribution of the line pressure of the nip.

20. . With regard to the prior art of the above-mentioned rolls, reference is made, by way of example, to the following patents SE-227 177, US-3,119,324 and US-4,089,094. The SE patent discloses the so-called A Kusters roll comprising a massive stationary central axis of a roll shell rotating around it and a load shoe system arranged between said shaft and the roll shell having a plurality of axially parallel sliding shoes corresponding to the inner surface of the roll shell, by adjusting the load pressure A similar roll is disclosed in the aforementioned U.S. Patent 3,119,324 (Applicant 30 Beloit Iron Works). Em. U.S. Patent 4,089,094 discloses an applicant's solution for a deflection control roll using a combination of a slipper and a chamber loaded with a pressure medium.

In addition, deflection-controlled rolls are known in which a plurality of successive chambers loaded with a pressure medium are arranged axially in the space between the fixed roll shaft 35 and the rotating roll shell, in which the pressure medium acts directly on the inner surface of the roll shell.

2 74067 1 It is also known to provide solutions inside or / or outside the roll based on heating fluid or inductive heating, which control the axial distribution of the diameters of the casing 5 by influencing the axial temperature distribution of the rotating roll shell and thus e.g.

It is an object of the present invention to further develop the above-mentioned deflection-adjustable paper machine rolls.

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The problem with these paper machine deflection compensated or adjusted rollers is that the applicant has become aware of the axial stiffness of their sheath. The roll shell must be quite rigid against the "flattening" caused by the nip load, which tends to shape the cross-section of the roll shell into a substantially elliptical shape, said rigidity requirement causing the roll shell to become relatively rigid in the longitudinal direction using known solutions. the axial profile can often not be adjusted with a sufficiently large steepness and a sufficiently small axial change interval 20, because the longitudinally rigid sheath allows only a certain change in the diameter of the sheath per axial longitudinal unit of the sheath.

The above-mentioned drawback has been reduced by the recent shift from rollers equipped with load shoes and chambers to profile adjustment based on roll shell heating and / or cooling. However, the latter control solutions have their own drawbacks, such as the conduction of heat from the heating zone to the sides of the jacket and the consequent undesired changes in the diameter of the jacket. In addition, changes in the jacket temperature profile also often affect the web moisture profile in an uncontrolled manner. Heating devices placed outside the roll shell often require quite large spaces, which are often deficient.

The present invention provides a novel solution to the problems discussed above so that deflection controlled rollers and the like can be implemented in a simpler, less bulky and / or less expensive solution.

li 3 74067 1 In order to achieve the above and later objects, the invention is mainly characterized in that in order to increase the steepness and accuracy of the axial profile adjustment of said nip forming said roll, compared to the bending stiffness of a roll shell of a corresponding full material or materials.

The roll shell according to the invention changes the diameter variation profile in its axial direction even more sensitively, which ensures a sufficiently precise and sufficiently sharp adjustment of the outer profile of the axial roll shell. However, when using the casing according to the invention, the stiffness of the roll casing with respect to the flattening loads has been kept substantially unchanged.

The invention will now be described in detail with reference to some embodiments of the invention shown in the figures of the accompanying drawing, to which, however, the invention is not limited.

Figure 1A is a schematic axial sectional view of a deflection compensated roll embodying the invention.

Fig. 1B shows the same as Fig. 1A in a partially sectioned view seen from the direction of the slipper arrangement.

Figure 2 shows a radial section of a roll according to the invention.

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Figure 3 shows a section IIX-III in Figure 2.

Figure 4 shows in principle four different implementations A, B, C and D of a roll shell according to the invention.

Figure 5 shows a radial vertical cross-section of a roll shell according to the invention loaded by a series of slippers.

35 4 74067 1 Fig. 6 shows a section VI-VI in Fig. 5.

Figure 7 shows a method for installing a roll shell according to the invention.

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Figure 8 shows an alternative roll shell according to the invention.

Figure 9 shows a one-piece roll shell according to the invention.

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According to Figures 1A and 1B, the deflection controlled roll 10 consists of a solid and fixed roll shaft 11 supported on its shaft pins 15a and 15b. The rotating roll shell 12 is rotatably mounted on the shaft pins 15a and 15b on bearings 14a and 14b. The roll shell 12 has a smooth outer surface 12 'and an inner surface 12 ". The structure of the roll shell 12 will be described in particular later. Between the fixed shaft 11 and the inner surface 12" of the roll shell 12 there is an intermediate space 16. There are possible roll shell loading devices 18 in parallel. direction. A separately adjustable fluid, such as hydraulic oil, is introduced into each loading device via channel 19. As is known, the roll shell 12 has been uniform and its thickness has been relatively large so that a sufficiently high strength has been obtained for the roll shell 12 in a direction perpendicular to the main plane of the web passing through the nip, i.e. against flattening of the roll shell. This has, as has been said, caused the roll jacket, which has had a sufficiently "steep" jacket profile for adjustment, to have far too long a longitudinal rigidity of the roll.

As shown in Figures 2 and 3, the roll shell 12 is composed of two cylindrical 30 parts, namely an outer shell 20 which is a unitary plate shell and an inner shell 21 therein. The axial (hereinafter referred to as longitudinal) bending stiffness of the shell 12 consisting of parts 20,21 is substantially reduced by an inner sheath 21 substantially stronger than the outer sheath 20 with annular grooves 23 or similar threaded 35 grooves extending considerably more than half the thickness of the sheath 21. The attenuation grooves 23 shown in Figures 2 and 3 are further utilized by placing heating cables 24 connected to the power supply 40 by a connecting line 41. The cable turns 24 of each groove 23 are I; 5 74067 1 arranged separately for heating. With the cable 24 placed in the grooves 23, each point of the jacket 12 can be heated with a suitably adjustable power, so that based on the temperature profile adjustment described above, the diameters of the roll jacket 12 can be changed and the pressure profile of the nip 5 (not shown) adjusted. When the longitudinal stiffness of the roll shell 12 is substantially reduced by means of said grooves 23 according to the invention, the axial profile adjustment of the roll shell diameters is made sufficiently steep. In accordance with Figures 2 and 3, said weakening grooves 23 are furthermore utilized in a new way as placement spaces for heating cables 23 or corresponding heating fluid flow pipes.

Fig. 4 schematically shows four different embodiments of a roll shell 15 12 according to the invention, which is weakened in the longitudinal direction of the roll, but which has a substantially equal rigidity with respect to the loads flattening the roll shell.

. According to Figure 4A, the roll shell 12 is as shown in Figures 2 and 3 and has an outer shell 20 and an inner shell 20 provided with an annular or threaded groove 23. The outer surface 12 'of the roll shell 12 forms a smooth outer shell 20. . the outer surface and the inner surface of the inner surface 12 "sheath portion 21.

According to Figure 4B, the sheath 12 comprises a thinner inner sheath 17 and a stronger outer sheath 21 with an annular groove 23 or similar threaded groove 25 on it, the smooth outer surface of which forms the outer surface 12 'of the sheath 12.

According to Fig. 4C, the jacket 12 consists of two integral thin cylindrical jackets, namely an outer jacket 20 and an inner jacket 17, between which are arranged rings 21 'forming a central jacket, with annular spaces 123 between the vertical sides.

As shown in Fig. 4D, the sheath 12 consists of a unitary outer sheath 20 and a plurality of adjacent ring portions 21 'arranged therein, between which there are spaces 123 in the absence of the inner sheath.

The different parts of the sheath described above can be made of different materials so that a more expensive material can be saved, e.g. so that only the outer sheath 20 is a corrosion-resistant material.

Figures 5 and 6 show a variation of the invention using 5 sets of load shoes 29 inside the roll shell 12. The roll shell 12 is a shell as described above, consisting of a unitary outer shell 20 and a substantially stronger inner shell 21 with a weakening groove 23. Load shoes 29 act against the smooth inner surface 12 "of the shell 12 so that lubricated particles form between the inner surface 12" and the sliding surfaces 10 of the shoes 29. sliding surfaces 30. Each loading shoe 29 is loaded by a piston 25 in the cylinder bore 26 via a ball joint 28. The cylinder bores 26 have annular seals 27 in the grooves of the bores 26. Pressure fluid inlet passages 26 'lead to the bores 26. By controlling the load pressure of the pistons 25 and using the "weakened" 15 jacket structure 12 according to the invention, the variations in the diameters D of the roll 10 are made sufficiently steep for the profile adjustment.

The following shows the ranges of dimensions marked in Fig. 6 in typical applications: 20 outer sheath 20 thickness A * 2-20 mm, axial pitch of weakening grooves 23 B = 20-200 mm, 25 groove 23 base supports thickness C = 2-20 mm, weakened inner sheath 21 thickness H = 10 -100 mm, width of grooves 23 E - 5-50 mm.

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Of the above dimensions, in particular the strength C of the base supports and the strength A of the outer sheath determine the reduced axial bending stiffness of the sheath 12 according to the invention.

It is essential to the invention that the longitudinal bending stiffness of the above-described sheath 12 is substantially weakened by grooves 23,223, spacers 123 or similar cavities 323 for at least about 25% of the corresponding sheath of the corresponding sheath. compared to flexural stiffness. With this weakening of the stiffening-deen, a sufficiently steep-shaped possibility of adjusting the roll profile is achieved. Most applications of the invention can be found in the region where said weakening process is 40-90%, preferably 60-80 X. It should be emphasized once again that despite the weakening according to the invention, the stiffness of the roller blade 12 against flattening nip loads has remained essentially unchanged or reduced.

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Figure 7 shows one way of mounting the outer jacket 20 on the inner jacket 21. This installation is used for the benefit of the inner shell 21 of annular grooves 23, which receive the holes 35 through the pressure oil (key 0), so that the outer shell 20 between the sealing rings 32 and 33 is expanded to 15 the sheath 20 around the welded mounting ring 31 in the direction F with sufficient force to push provides the inner sheath 21 on. As the jacket 20 is placed on the inner jacket 21, a compressed oil load is introduced into the grooves 23. The end 31 of the jacket 20 on the mounting ring side is provided with a weakening 34 to facilitate installation. In the installation of the jacket parts 20, it is also possible to take advantage of the thermal elongation of the various parts known per se and the shrink joints known per se in the joints of the jacket parts after the recovery of the temperature differences.

The accompanying Figures 8 and 9 are intended to illustrate some variations of the invention. According to Fig. 8, the roll shell 12 consists of a unitary outer shell 20 and a stronger inner shell 21 with special grooves 223 with a wider e.g. circular cross-sectional inner portion 224 and a narrower mouth portion 225.

Figure 9 shows a sheath 12 according to the invention, which is one integral piece, e.g. cast iron. The weaknesses of the sheath 12 are the annular cavities 323, which are provided in a casting step known per se. As shown in Figure 9, the ring cavities 323 are completely closed, but open weakening cavities can also be used.

The outer sheaths 20 described above are shown as uniform relatively thin sheet sheaths having a smooth outer surface 12 '. However, the plate sheaths can also, if necessary, also be grooved or provided with another outer part, e.g. an elastic coating. In addition to or instead of the sheet sheath 20, it is also possible to use either grooved or smooth sheaths made by wrapping a profile strip known per se, which can be produced e.g. by developing the so-called G-roll technique.

In the following, the claims are set forth within the scope of the inventive idea defined by which the various details of the invention may vary and differ from those set forth above by way of example only.

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Claims (10)

A roll for adjusting the deflection profile of a paper machine, in particular a press roll, a calender roll or a coating roll application roll, comprising a fixed roll shaft (11) and a substantially cylindrical jacket (12) arranged to rotate thereon, having a total wall thickness (H) of sufficient with respect to the flattening load of the nip formed in connection with the roll, characterized in that in order to increase the steepness and accuracy of the axial profile adjustment of the nip forming said roll (10), the axial deflection stiffness , by means of spacers (123), weakening grooves (323) or the like compared to the bending stiffness of a roll of the corresponding full material or materials. 15 1 Claims Roll casing according to Claim 1, characterized in that the axial direction of bending stiffness of the roller casing (12) is reduced by at least about 25%, suitably by about 40-90%, compared with a corresponding full material or materials. 20 Roll according to Claim 1 or 2, characterized in that the roll shell (12) consists essentially of an outer casing (20) of uniform material and a substantially thicker inner casing (21) with annular or helical grooves (23; 223) or annular grooves. the spaces (123) of the parts (21 ') (Figures 2,3,4A, 4C, 4D, 5,6,7 and 8). Roll according to claim 3, characterized in that the strength (H) of said non-sheath (21) provided with a weakening groove or the like of said roll flange (12) is about five times greater than the strength (A) of said outer sheath (20). Roll according to any one of claims 1 to 4, characterized in that said roll flap (12) has a unitary inner sheath (17) thinner than the intermediate or outer sheath (Fig. 4C). 35 Roll according to one of Claims 1 to 3, characterized in that the outer part of the roll flange (12) is formed by an outer shell with annular or threaded grooves 10 (1040) 1 which are covered by a thinner inner flange (17) (Fig. 4B). Roll according to Claims 1 to 6, characterized in that the different dimensions of the roll shell (12) are in the following ranges: thickness A of the outer shell (20) - 2 to 20 mm, inner or spindle grooves (23) or gaps (123) sheath thickness H - 10-100 mm, roll shell (12) diameter D - 200-2000 mm, width of reflection groove or the like G = 5-50 mm, thickness of bottom bases of inner sheath or intermediate shell reflection groove C = 2-20 10 mm. Roll according to one of Claims 1 to 3, characterized in that the roll shell (12) consists essentially of a single cylindrical ring with a series of weakening cells (323) (Fig. 9). Roll according to one of Claims 1 to 8, characterized in that means, e.g. electric heating cables (24) or heating fluid flow pipes, are arranged in said weakening grooves, with which the diameter profile of the roll jacket is adjusted on the basis of temperature changes (Figures 2 and 3). 9 74067 Roll according to one of Claims 1 to 9, characterized in that the roll shell (12) has a solid, stationary central shaft 25 (11) with a series of axially successive loading pistons (25) and / or chambers, each of which is to be loaded separately. adjustable pressure means and that said pistons (25) or the like load the reading shoes (29) and / or the pressure of the chambers directly on the inner surface of the roll shell (12), by means of which an adjustable load profile is applied to the inner surface (12 ") of the roll shell (12). , 74067