Roller device

Abstract

To improve a roller device so as to reduce a clearance of a bearing while improving feeding.SOLUTION: A roller arrangement (1) comprising at least two rollers (2, 3), wherein a nip (5) is formed between at least two adjacent rollers, wherein each of the at least two rollers is provided with a roller journal (7), and wherein the roller journal is provided at an axial end opposite the roller journal. At least on both the first roller journal 2 of the first one of the at least two rollers and the first roller journal of the second one of the at least two rollers 3, at least two bearings 9,10 are arranged axially side by side, wherein opposing mechanical stresses are generated between the at least two bearings on the first roller journal of the first roller and said at least two bearings on the first roller journal of the second roller.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a roller device provided with at least two rollers arranged axially parallel to each other, with corresponding nips formed between adjacent rollers, wherein each of the rollers is provided with a roller journal at each of its two axial ends, and each roller is rotatably mounted via the two roller journals, and at least two bearings are arranged axially adjacent to each other on at least both a first roller journal of a first of the rollers and another first roller journal adjacent to a second of the rollers. [Background technology]

[0002] In roller mills, the rollers are positioned relative to each other via bearings in the mounting parts. The distance between the rollers can be adjusted by advancing at least one of these rollers. When processing normal materials with homogeneous material properties, the rollers are pressed against each other by a nearly constant force that travels from the material to be rolled to the opposing gaps of the bearings and remains there. This does not cause problems in the processing quality as long as the direction of the force is nearly constant and the feed-in, which is related to the pressure in the nip, is reasonably constant. In most rolling processes, this feed-in is sufficiently accurate, since there are no large load variations.

[0003] On the other hand, conventional roll mills are not suitable for processing materials in continuous production where the rolling process results in different material properties and therefore different processing forces in the nip. The different density distributions in the resulting material web result in different rolling forces, which can cause the nip to collapse or the rollers to spread apart. This results in different material properties and thicknesses in the rolled material, which is then finished as a material web, film, coated material web, or multi-layer material web.

[0004] Particularly in the case of roller arrangements in which more than two rollers are arranged in a row and the material to be rolled passes through the individual nips in a serpentine manner one after the other, the challenge arises of alternately preloading the bearing surfaces facing the load side without play, while making contact with the side facing away from the nips, in order to be able to exert the load required for rolling in both nips on both sides of the roller. Summary of the Invention

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to improve the roller arrangement in such a way that it allows for improved feeding while at the same time reducing bearing clearance.

[0006] This object is solved by a roller device according to claim 1. Advantageous embodiments of the invention are subject of protection in the dependent claims.

[0007] Therefore, a roller device is proposed, which includes at least two rollers arranged axially parallel to each other, each of which has a nip formed between adjacent rollers, each of which has a roller journal at both of its two axial ends, each of which is mounted via its two roller journals, and at least two bearings arranged axially adjacent to each other in a first roller journal of a first roller and an adjacent first roller journal of a second roller, wherein compressive stresses are generated between an inner bearing of the first roller journal of the first roller and an outer bearing of the first roller journal of the second roller, and tensile stresses are generated between an outer bearing of the first roller journal of the first roller and an inner bearing of the first roller journal of the second roller, and vice versa, where "inverse" means that the tensile and / or compressive stresses can be reversed as long as they exist between diagonally spaced adjacent bearings. This cross tensioning ensures that the two roller bearings are tensioned in series with one another at the roller journals, resulting in force guidance nesting, thereby achieving the required air gap.

[0008] In one embodiment, deviations from this may be made by providing only compressive stresses or only tensile stresses to all bearings.

[0009] Furthermore, the roller device may include at least three rollers arranged axially parallel to one another, and two bearings may be provided axially adjacent to one another at least on the first roller journal of at least a third roller, with compressive stresses being generated between the inner bearing on the first roller journal of the second roller and the outer bearing on the first roller journal of the third roller, and tensile stresses being generated between the outer bearing on the first roller journal of the second roller and the inner bearing on the first roller journal of the third roller, or vice versa. The stress states between the diagonally spaced bearings may in particular alternate between rollers. This means that the inner bearing of the middle roller is under tensile stress toward the first roller and compressive stress toward the third roller, and vice versa. This also means that the outer bearing of the middle roller is under compressive stress toward the first roller and tensile stress toward the third roller, or vice versa. In particular, the stresses acting on both sides of the bearing may be identical. Thus, any number of additional rollers having the same bearing configuration can be placed adjacent to each other and axially parallel, with the stress curves through each bearing continuing as above.

[0010] Furthermore, at least both the second roller journal of the first roller and another adjacent second roller journal of the second roller may be provided with at least two bearings, wherein a compressive stress is generated between the inner bearing of the second roller journal of the first roller and the outer bearing of the second roller journal of the second roller in a mirror image of the opposite side of the first roller journal, and a tensile stress is generated between the outer bearing of the second roller journal of the first roller and the inner bearing of the second roller journal of the second roller, or vice versa. In this context, mirror image means inverted with respect to a radial central axis extending perpendicular to each roller. In particular, this means that the same tensile or compressive stress can be applied to both inner and outer bearings of opposing roller journals.

[0011] Furthermore, at least two bearings may be arranged at least on the second roller journal of the third roller, so that compressive stresses are generated between an inner bearing on the second roller journal of the second roller and an outer bearing on the second roller journal of the third roller, mirroring the opposite side of the first roller journal, and tensile stresses are generated between an outer bearing on the second roller journal of the second roller and an inner bearing on the second roller journal of the third roller, and vice versa.

[0012] In particular, at least three bearings may be arranged at least axially adjacent to one another on a first roller journal of the first roller and an adjacent first roller journal of the second roller, with compressive stresses being generated between the inner and outer bearings of the first roller journal of the first roller on the one hand and the central bearing unit of the first roller journal of the second roller on the other hand, and tensile stresses being generated between the central bearing unit of the first roller journal of the first roller on the one hand and the inner and outer bearings of the first roller journal of the second roller on the other hand, and vice versa. This arrangement is particularly important in the case of high loads, where nesting of bearings into multiple arrangements is required, so that the loads within each journal overlap with the load cluster, reducing the bending or moment of the journal towards the roller-bale transition, i.e., at the roll-side end of the roller bearing towards the roller bail, to zero N·m.

[0013] Furthermore, at least three rollers may be provided, arranged axially parallel, with at least three bearings arranged at least axially adjacent to one another on the first roller journal of the third roller, with compressive stresses being generated between the inner and outer bearings of the first roller journal of the second roller, on the one hand, and the central bearing unit of the first roller journal of the third roller, on the other hand, and tensile stresses being generated between the central bearing unit of the first roller journal of the second roller, on the other hand, and the inner and outer bearings of the first roller journal of the third roller, and vice versa. The stress states of the diagonally spaced bearings may alternate, particularly between the rollers. This means that the inner bearings of the central roller are under tensile stress toward the inner / outer bearings of the first roller and under compressive stress toward the inner / outer bearings of the third roller, and vice versa. This further means that the inner / outer bearings of the middle roller can be under compressive stress towards the middle bearing of the first roller and under tensile stress towards the middle bearing of the third roller, and vice versa. In particular, the stresses acting on the bearings on both sides can be of the same magnitude. It is therefore conceivable that any number of additional rollers with the same bearing configuration can be arranged adjacent to each other axially parallel, with the stress curves through each bearing continuing as above.

[0014] Additionally, at least three bearings may be arranged on at least both the second roller journal of the first roller and the second roller journal of the adjacent second roller, with compressive stresses being generated between the inner and outer bearings of the second roller journal of the first roller and the central bearing unit of the second roller journal of the second roller, mirror-imaged to the opposite side of the first roller journal, and tensile stresses being generated between the central bearing unit of the second roller journal of the first roller and the inner and outer bearings of the second roller journal of the second roller, or vice versa. In this context, mirror-image means mirror-imaged with respect to a radial central axis extending perpendicular to each roller. Thus, in particular, the same type of force may be applied to both inner and outer bearings of opposing roller journals, and the same type of force may be applied to both central bearings of opposing roller journals. The individual stress states of directly adjacent bearing sides facing each other may be complementary to each other.

[0015] Additionally, at least three bearings can be arranged on the second roller journal of the third roller, with compressive stresses mirroring the first roller journal side between the inner and outer bearings of the second roller journal of the second roller and the central bearing unit of the second roller journal of the third roller, and tensile stresses mirroring the first roller journal side between the central bearing unit of the second roller journal of the second roller and the inner and outer bearings of the second roller journal of the third roller, and vice versa. By utilizing such bearing arrangements and bearing forces, cross-compressive or tensile states are created between opposing roller journals, with the pressure curves for adjacent connections being identical. For example, compressive stresses from roller journal to roller journal are always transmitted inward from the outer / inner bearings toward the central bearing unit, while tensile stresses are always transmitted outward from the central bearing unit toward the outer / inner bearings.

[0016] The material to be rolled can be passed through each nip alternately in opposite directions from nip to nip, thus utilizing both sides of the inner roller for rolling. Because adjacent rollers rotate in different directions, the material must be guided through adjacent rolling nips, alternating between above and below.

[0017] Furthermore, a roller position control unit may be provided between the roller journals to generate tensile and / or compressive stresses, and the roller position control unit provides a respective nip adjustment.

[0018] In this case, the roller position control unit can be provided with pressure-controlled actuators, preferably with separate actuators between each pair of coupled bearings. Pressure-controlled actuators have the advantage that the feed rate can be set particularly effectively, especially in the case of materials with an uneven density distribution.

[0019] In particular, the actuator may comprise a hydraulic, mechanical or electric actuator, and in some cases may comprise a hydraulic actuator, a mechanical spindle and a linear motor.

[0020] Additionally, the roller position control unit may be operably connected to each of the bearing outer rings.

[0021] In particular, the central bearing unit can be provided with one or more, preferably two, bearings. If the central bearing unit is provided with two bearings, these can be arranged directly adjacent to each other in the axial direction. Furthermore, adjacent bearings of the central bearing unit can be axially clamped relative to each other.

[0022] Additionally, the bearings may comprise rolling bearings and / or plain bearings. [Brief explanation of the drawings]

[0023] Exemplary embodiments of the present invention will now be described with reference to the following drawings.

[0024] [Figure 1a] FIG. 1 is a cross-sectional view of a roller device showing the processing force in a rolling process. [Figure 1b] 1 is a schematic diagram of a prior art roller arrangement illustrating the processing forces acting on the bearings during the rolling process. [Figure 2] 1 is a schematic diagram of an embodiment of a roller device according to the present invention; [Figure 3] 4 is a schematic view of a further embodiment of a roller device of the present invention; FIG. [Figure 4] 1 is a cross-sectional view of an exemplary roller device in which multiple rollers are arranged in series. [Figure 5a] FIG. 1 is a side view of an example of a roller device according to the present invention having four bearings per roller journal. [Figure 5b] FIG. 2 is a semi-transparent side view of an example of a roller device according to the present invention having four bearings per roller journal. [Figure 6] FIG. 10 shows a force polygon for an embodiment of a roller device according to the invention with four bearings per roller journal. DETAILED DESCRIPTION OF THE INVENTION

[0025] In a roll mill, rollers are positioned relative to one another via bearings in mounting elements. Figure 1a shows a roller unit 1 of a roller mill, with two rollers 2 and 3 arranged axially parallel to one another and forming a nip with a width h1 between them. The side view of the illustration reveals the roller bearing arrangement, consisting of an inner bearing ring 15 and an outer bearing ring 14, in which the inner bearing rings 15 are rotatably mounted. Each outer bearing ring 14 is fixed in a mounting element. As a material web 16 having a thickness h0 passes through the nip 5, it is reduced to a compressed material web 18 with a material thickness h1. A more or less unidirectional force flow through the material web 16 presses the rollers against each other in the opposing gaps of the bearings and holds them there. The resulting working forces, perpendicular to the feed direction of the material web 16, are the force FW from the material being rolled, from the inner bearing ring 15 to the outer bearing ring 14. At the same time, a linear force F from the outer bearing ring 14 acts on the inner bearing ring 15. As a result, each bearing inner ring 15 is pressed outward towards the inside of the bearing outer ring 14 so that a bearing gap 17 is formed on the side of the bearing outer ring 14 facing towards the rolling gap 5 .

[0026] The representation of the working forces according to Figure 1a can also be seen in Figure 1b, which shows a top view of the bearing arrangement of Figure 1a. Two rollers 2, 3 are arranged axially parallel to each other to form a nip 5. Each roller 2, 3 is provided with a roller journal 7, 8 at its two axial ends 6, and a bearing 9 is arranged in each roller journal 7, 8, supporting the rollers 2, 3. As the material web 16 passes through the rolling nip 5, working forces are generated perpendicular to the direction of passage. These forces are transmitted via the roller bails to the roller journals, and from each journal to the inner bearing ring 15 arranged in contact with it, which are then supported by the outer bearing ring 14. These forces FW from the rolled material press the inner bearing ring 15 outward within the outer bearing ring 14, creating a bearing gap 17 inside each bearing. In addition, a linear force F from the infeed in the direction of the rolling nip 5 is exerted on the bearing outer ring 14 by infeeding the bearings relative to one another, i.e. by adjusting the width of the roller gap 5 .

[0027] The inventive design shown in Figures 2 and 3 has the advantage of being able to accommodate load changes from one rolling nip 5 to the other independently of the micrometric accuracy, especially in the case of large load changes resulting from the rolled material. This is made possible by the roller position control provided and, at the same time, by the elimination of bearing clearance. The roller bearing arrangement 1 relative to one another described in this invention allows for the nesting of force-guiding chocks and counter-force-guiding gap feeds, both of which are arranged in a cascade. In the first embodiment according to Figure 2, two roller bearings are provided for each roller journal 7, 8 of a row of axially parallel rollers 2, 3, 4, which are fastened together to allow the required gap-free positioning by force-guiding nesting. In the illustrated embodiment, the bearing outer rings 14 of diagonally adjacent bearings are in an operable connection that generates tensile or compressive stresses between the bearings. For example, the bearing outer ring 15 of the outer bearing 10 of the first roller journal 7 of the first roller 2 is subjected to tensile stress relative to the diagonally adjacent bearing outer ring 15 of the inner bearing 9 of the first roller journal 7 of the second roller 3. Furthermore, compressive stress exists between the side of the bearing outer ring 15 of the bearing 9 of the first roller journal 7 of the second roller 3 facing away from the first roller 2 and the diagonally adjacent bearing outer ring 15 of the outer bearing 10 of the first roller journal 7 of the third roller 4. At the same time, there is an effective connection in the form of compressive stress between the bearing outer ring 15 of the inner bearing 9 of the first roller journal 7 of the first roller 2 and the bearing outer ring 15 of the outer bearing 10 of the first roller journal 7 of the second roller 3. The side of the bearing outer ring 15 of the outer bearing 10 of the first roller journal 7 of the second roller 3 facing away from the first roller 2 is then operably connected in the form of tensile stress to the diagonally adjacent bearing outer ring 15 of the inner bearing 9 of the first roller journal 7 of the third roller 4.Thus, tensile and compressive stresses alternate in a zigzag pattern within a series of operatively connected bearings. Thus, in the embodiment shown in FIG. 2, tensile stresses on the first roller journal 7 always flow from the outer bearing 10 of the left roller toward the inner bearing 9 of the adjacent roller on the right. Conversely, compressive stresses on the first roller journal 7 always flow from the inner bearing 9 of the left roller toward the outer bearing 10 of the adjacent roller on the right. The stress curves on the second roller journal 8 are a perfect mirror image of those on either side of the roller journal 7. In the embodiment shown in FIG. 2, compressive stresses always flow from the inner bearing 9 of the left roller toward the outer bearing 10 of the adjacent roller on the right. Conversely, tensile stresses always flow from the left bearing 10 of the left roller toward the inner bearing 9 of the adjacent roller on the right. This bearing arrangement with corresponding stress curves can be continued for any number of rollers arranged axially parallel to one another and with a nip 5 between them.

[0028] The example of FIG. 3 shows a further embodiment of the roller device 1, in which four bearings 9, 10, 11 are arranged axially adjacent to one another on the first roller journal 7 of the first roller 2 and the adjacent first roller journal 7 of the second roller 3. In this case, the two central bearings 11 form a bearing unit in which both bearings 11 are arranged directly adjacent to one another and are clamped relative to one another. In contrast, two outer bearings 9, 10 are each arranged at a distance from this central bearing unit. Compressive stresses are generated between the inner and outer bearings 9, 10 of the first roller journal 7 of the first roller 2 on the one hand and the central bearing unit of the first roller journal 7 of the second roller 3 on the other hand. Furthermore, tensile stresses are generated between the central bearing unit of the first roller journal 7 of the first roller 2 on the one hand and the inner and outer bearings 9, 10 of the first roller journal 7 of the second roller 3 on the other hand. This arrangement 1 is particularly important in the case of high loads where nesting of each bearing 9, 10, 11 in a multiple arrangement is required, so that the loads in each journal 7, 8 are superimposed into a load cluster and the bending or bending moment of the journal towards the roller bail transition, i.e. at the roll side end of the roller bearing facing the roller bail, is reduced to zero N·m. FIG. 3 further shows a roller arrangement 1 having three rollers 2, 3, 4 arranged axially parallel to one another, and four bearings 9, 10, 11 similarly arranged axially adjacent to one another on the first roller journal 7 of the third roller 4, where compressive stresses are generated between the inner bearing 9 and outer bearing 10 on the first roller journal 7 of the second roller 3 on the one hand and the central bearing unit on the first roller journal 7 of the third roller 4 on the other hand, and tensile stresses are generated between the central bearing unit on the first roller journal 7 of the second roller 3 on the one hand and the inner bearing 9 and outer bearing 10 on the first roller journal 7 of the third roller 4 on the other hand.Furthermore, four bearings 9, 10, 11 are arranged on the second roller journal 8 of the first roller 2 and the second roller journal 8 of the adjacent second roller 3, respectively, so that compressive stresses are generated between the inner bearing 9 and outer bearing 10 of the second roller journal 8 of the second roller 3 on the one hand and the central bearing unit of the second roller journal 8 of the second roller 3 on the other hand, in a mirror image of the first roller journal 7 on the opposite side, and tensile stresses are generated between the central bearing unit of the second roller journal 8 of the first roller 2 on the one hand and the inner bearing 9 and outer bearing 10 of the second roller journal 8 of the second roller 3 on the other hand. Furthermore, four bearings are also arranged on the second roller journal 8 of the third roller 4, so that, mirror-imaged to the opposite side of the first roller journal 7, compressive stresses are generated between the inner bearing 9 and outer bearing 10 of the second roller journal 8 of the second roller 3 and, on the other hand, the central bearing unit of the second roller journal 8 of the third roller 4, and tensile stresses are generated between, on the one hand, the central bearing unit 11 of the second roller journal 8 of the second roller 3 and, on the other hand, the inner bearing 9 and outer bearing 10 of the second roller journal 8 of the third roller 4.

[0029] 4 shows a roller arrangement 1 with seven rollers arranged in a line, the inner five rollers forming rolling nips 5 with the adjacent rollers in front and behind. The finished rolled material web 16 is wound onto a take-up reel 19 after passing through all the rolling nips 5. Due to the requirement that such a roller arrangement 1 provide the necessary infeed in both rolling nips 5 of the rollers involved, the invention is particularly advantageous for roller arrangements 1 having more than two rollers. In such an arrangement 1, the challenge arises of alternately preloading the bearing sides facing the load side without play and at the same time contacting the gap sides facing away from the rolling nip 5 in order to be able to exert the load required for rolling in the nip.

[0030] 5a and 5b each show a side view of an embodiment of a roller device 1 according to the present invention, in which four bearings 9, 10, and 11 are provided per roller journal 7, 8, and in particular the manner in which the individual bearings 9, 10, and 11 are clamped relative to one another. Each of the illustrated rollers 2, 3 is provided with four bearings 9, 10, and 11 adjacent to the illustrated roller journal 7, each of which is preloaded and adjusted relative to one another using a roller position control unit 12 located between the roller journals 7 of both rollers 7, 8. The bearings are nested side-by-side on both journals 7, perpendicular to the axial direction of the rollers 2, 3. It can be seen that the roller position control unit 12 is provided with four actuators 13, arranged one above the other. In the illustrated embodiment, the uppermost and lowermost actuators 13 generate tensile stresses that act on the central bearing 11 of the left roller 2 and the outer and inner bearings of the right roller 3. In contrast, the two central actuators 13 exert compressive stresses on the outer bearing 9 / inner bearing 10 of the left roller 2 and the central bearing 11 of the right roller 3. These stresses are transmitted to the corresponding outer bearing ring 14 of the actuated bearing via pressure transmission elements connected to both sides of the actuators. The pressure transmission elements are arranged horizontally, one below the other, forming a drawer structure. The inner bearing ring 15 of the front outer bearing 10 of the left roller 2 is subjected to compressive stress and rests on the rolling elements of the outer bearing ring 14 facing towards the nip 5, with bearing play visible on the side facing away from the nip 5. Similarly, the inner bearing ring 15 of the front outer bearing 10 of the right roller 3 is subjected to tensile stress and rests on the rolling elements of the outer bearing ring 14 facing away from the nip 5, with bearing play visible on the side facing towards the nip 5. Via the roller position control unit, the individual tensile and compressive stresses at the individual actuators can be varied and can be controlled in particular via the pressures present across the various rolling nips 5. It is also possible to exchange the pressure arrangements, so that bearings under tensile stress can be transferred to compressive stress and those under compressive stress can be transferred to a tensile stress state.In the illustrated embodiment, the bearings are cylindrical roller bearings.

[0031] FIG. 6 illustrates the force flow between roller journals in an example quadruple bearing arrangement. In this exemplary configuration, the frame highlighted by dashed lines realizes the feeding of two adjacent rollers 2 and 3. The bearings labeled a1, d1, b2, and c2 in the figure are fed in a pressure-controlled manner by two actuators labeled 2 and 3. Simultaneously, the bearings labeled b1, c1, a2, and d2 are held in place by actuators labeled 1 and 4. In this way, each bearing is preloaded relative to each other, and each roller is prepositioned relative to each other. Similarly, this configuration can be adapted for row-by-row positions, where successive rollers are positioned relative to each other to create corresponding subsequent nips.

[0032] The features of the invention disclosed in the above specification, in the drawings and in the claims may be essential for realising the invention both individually and in any combination. [Explanation of symbols]

[0033] 1 Roller device 2 First Roller 3 Second Roller 4. Third Roller 5. Rolling nip 6 shaft end 7. First Roller Journal 8. Second Roller Journal 9 Inner bearing 10 Outer bearing 11 Central bearing 12 Roller position control unit 13 Actuator 14 Bearing outer ring 15 Bearing inner ring 16 Material Web 17 Bearing clearance 18 Compressed Material Web 19 Take-up reel 20 Compressive stress 21 Tensile stress F Linear force FW Force from unrolled material h1 Material web height h0 Height of compressed material web v Rolling speed

Claims

1. A roller device (1) comprising at least two rollers (2, 3) and a nip (5) formed between the at least two adjacent rollers (2, 3), Each of the at least two rollers (2, 3) is provided with a roller journal (7) and is provided with a roller journal (7) at an axial end (6) opposite to the roller journal (7); At least two bearings (9, 10) are arranged axially side by side on at least both a first roller journal (7) of a first roller (2) of the at least two rollers and a first roller journal (7) of a second roller (3) of the at least two rollers; A roller device (1), characterized in that opposing mechanical stresses are generated between the at least two bearings (9, 10) in the first roller journal (7) of the first roller (2) and the at least two bearings (9, 10) in the first roller journal (7) of the second roller (3).

2. At least three rollers (2, 3, 4) are provided, two bearings (9, 10) are arranged axially side by side on the first roller journal (7) of the third roller (4) of the at least three rollers (2, 3, 4); opposing mechanical stresses are generated between the at least two bearings (9, 10) of the first roller journal (7) of the second roller (3) and the at least two bearings (9, 10) of the first roller journal (7) of the third roller (4); 2. A roller device (1) according to claim 1.

3. At least two bearings are arranged axially side by side at least the second roller journal (8) of the first roller (2) and the second roller journal (8) of the second roller (3); a mirror image of a mechanical stress generated between the at least two bearings (9, 10) of the second roller journal (8) of the first roller (2) and the at least two bearings (9, 10) of the second roller journal (8) of the second roller (3) on the side of the first roller journal (7) is opposite to that of the first roller journal (7); 3. A roller device (1) according to claim 1 or 2.

4. At least two bearings (9, 10) are arranged axially side by side at least on the second roller journal (8) of the third roller (4); opposing mechanical stresses are generated between the at least two bearings (9, 10) of the second roller journal (8) of the second roller (3) and the at least two bearings (9, 10) of the second roller journal (8) of the third roller (4); 3. A roller device (1) according to claim 2.

5. A compressive stress is generated between the inner bearing (9) of the first roller journal (7) of the first roller (2) and the outer bearing (10) of the first roller journal (7) of the second roller (3); and a tensile stress is generated between the outer bearing (10) of the first roller journal (7) of the first roller (2) and the inner bearing (9) of the first roller journal (7) of the second roller (3); 2. A roller device (1) according to claim 1.

6. a tensile stress is generated between the inner bearing (9) of the first roller journal (7) of the first roller (2) and the outer bearing (10) of the first roller journal (7) of the second roller (3); and a compressive stress is generated between the outer bearing (10) of the first roller journal (7) of the first roller (2) and the inner bearing (9) of the first roller journal (7) of the second roller (3); 2. A roller device (1) according to claim 1.

7. A compressive stress is generated between the inner bearing (9) of the first roller journal (7) of the second roller (3) and the outer bearing (10) of the first roller journal (7) of the third roller (4); and a tensile stress is generated between the outer bearing (10) of the first roller journal (7) of the second roller (3) and the inner bearing (9) of the first roller journal (7) of the third roller (4); 3. A roller device (1) according to claim 2.

8. a tensile stress is generated between the inner bearing (9) of the first roller journal (7) of the second roller (3) and the outer bearing (10) of the first roller journal (7) of the third roller (4); and a compressive stress is generated between the outer bearing (10) of the first roller journal (7) of the second roller (3) and the inner bearing (9) of the first roller journal (7) of the third roller (4); 3. A roller device (1) according to claim 2.

9. A compressive stress is generated between the inner bearing (9) of the second roller journal (8) of the first roller (2) and the outer bearing (10) of the second roller journal (8) of the second roller (3) in a mirror image with respect to the side of the first roller journal (7); and a tensile stress is generated between an outer bearing (10) of the second roller journal (8) of the first roller (2) and an inner bearing (9) of the second roller journal (8) of the second roller (3); A roller device (1) according to claim 3.

10. A tensile stress is generated between the inner bearing (9) of the second roller journal (8) of the first roller (2) and the outer bearing (10) of the second roller journal (8) of the second roller (3) in a mirror image with respect to the side of the first roller journal (7); and a compressive stress is generated between an outer bearing (10) of the second roller journal (8) of the first roller (2) and an inner bearing (9) of the second roller journal (8) of the second roller (3); A roller device (1) according to claim 3.

11. A compressive stress is generated between the inner bearing (9) of the second roller journal (8) of the second roller (3) and the outer bearing (10) of the second roller journal (8) of the third roller (4) in a mirror image with respect to the first roller journal (7); and a tensile stress is generated between an outer bearing (10) of the second roller journal (8) of the second roller (3) and an inner bearing (9) of the second roller journal (8) of the third roller (4); 5. A roller device (1) according to claim 4.

12. A tensile stress is generated between the inner bearing (9) of the second roller journal (8) of the second roller (3) and the outer bearing (10) of the second roller journal (8) of the third roller (4) in a mirror image with respect to the side of the first roller journal (7); and a compressive stress is generated between an outer bearing (10) of the second roller journal (8) of the second roller (3) and an inner bearing (9) of the second roller journal (8) of the third roller (4); 5. A roller device (1) according to claim 4.

13. At least three bearings (9, 10, 11) are arranged axially side by side at least on the first roller journal (7) of the first roller (2) and the first roller journal (7) of the second roller (3); opposing mechanical stresses are generated between the at least three bearings (9, 10, 11) of the first roller journal (7) of the first roller (2) and the at least three bearings (9, 10, 11) of the first roller journal (7) of the second roller (3); A roller device (1) according to any one of claims 1 to 12.

14. At least three bearings (9, 10, 11) are arranged axially side by side at least on the first roller journal (7) of the third roller (4) of the at least three rollers (2, 3, 4); opposing mechanical stresses are generated between the at least three bearings (9, 10, 11) of the first roller journal (7) of the second roller (3) and the at least three bearings (9, 10, 11) of the first roller journal (7) of the third roller (4); Roller device (1) according to claim 13, characterized in that

15. At least three bearings (9, 10, 11) are arranged axially side by side at least on the second roller journal (8) of the first roller (2) and on the second roller journal (8) of the second roller (3); opposing mechanical stresses are generated between the at least three bearings (9, 10, 11) of the second roller journal (8) of the first roller (2) and the at least three bearings (9, 10, 11) of the second roller journal (8) of the second roller (3); A roller device (1) according to any one of claims 1 to 14.

16. At least three bearings (9, 10, 11) are arranged axially side by side at least on the second roller journal (8) of the third roller (4) and on the second roller journal (8) of the second roller (3); opposing mechanical stresses are generated between the at least three bearings (9, 10, 11) of the second roller journal (8) of the second roller (3) and the at least three bearings (9, 10, 11) of the second roller journal (8) of the third roller (4); 16. Roller device (1) according to claim 15.

17. compressive stresses are generated between, on the one hand, the inner bearing (9) and the outer bearing (10) of the first roller journal (7) of the first roller (2) and, on the other hand, the central bearing unit (11) of the first roller journal (7) of the second roller (3); and tensile stresses are generated between, on the one hand, the central bearing unit (11) of the first roller journal (7) of the first roller (2) and, on the other hand, the inner bearing (9) and the outer bearing (10) of the first roller journal (7) of the second roller (3). Roller device (1) according to claim 13, characterized in that

18. tensile stresses are generated between, on the one hand, the inner bearing (9) and the outer bearing (10) of the first roller journal (7) of the first roller (2) and, on the other hand, the central bearing unit (11) of the first roller journal (7) of the second roller (3); and compressive stresses are generated between, on the one hand, a central bearing unit (11) of the first roller journal (7) of the first roller (2) and, on the other hand, an inner bearing (9) and an outer bearing (10) of the first roller journal (7) of the second roller (3). Roller device (1) according to claim 13, characterized in that

19. compressive stresses are generated between, on the one hand, the inner bearing (9) and the outer bearing (10) of the first roller journal (7) of the second roller (3) and, on the other hand, the central bearing unit (11) of the first roller journal (7) of the third roller (4); and tensile stresses are generated between, on the one hand, the central bearing unit (11) of the first roller journal (7) of the second roller (3) and, on the other hand, the inner bearing (9) and the outer bearing (10) of the first roller journal (7) of the third roller (4). Roller device (1) according to claim 14, characterized in that

20. tensile stresses are generated between, on the one hand, the inner bearing (9) and the outer bearing (10) of the first roller journal (7) of the second roller (3) and, on the other hand, the central bearing unit (11) of the first roller journal (7) of the third roller (4); and compressive stresses are generated between, on the one hand, the central bearing unit (11) of the first roller journal (7) of the second roller (3) and, on the other hand, the inner and outer bearings (9) and (10) of the first roller journal (7) of the third roller (4). Roller device (1) according to claim 14, characterized in that

21. compressive stresses are generated between the inner bearing (9) and the outer bearing (10) of the second roller journal (8) of the first roller (2) on the one hand, and the central bearing unit (11) of the second roller journal (8) of the second roller (3) on the other hand, in a mirror image with respect to the side of the first roller journal (7); and tensile stresses are generated between, on the one hand, the central bearing unit (11) of the second roller journal (8) of the first roller (2) and, on the other hand, the inner bearing (9) and the outer bearing (10) of the second roller journal (8) of the second roller (3).

16. Roller device (1) according to claim 15.

22. tensile stresses are generated between the inner bearing (9) and the outer bearing (10) of the second roller journal (8) of the first roller (2) on the one hand, and the central bearing unit (11) of the second roller journal (8) of the second roller (3) on the other hand, in a mirror image with respect to the side of the first roller journal (7); and compressive stresses are generated between, on the one hand, the central bearing unit (11) of the second roller journal (8) of the first roller (2) and, on the other hand, the inner bearing (9) and the outer bearing (10) of the second roller journal (8) of the second roller (3).

16. Roller device (1) according to claim 15.

23. compressive stresses are generated between, on the one hand, the inner bearing (9) and the outer bearing (10) of the second roller journal (8) of the second roller (3) and, on the other hand, the central bearing unit (11) of the second roller journal (8) of the third roller (4) in a mirror image with respect to the side of the first roller journal (7); and tensile stresses are generated between, on the one hand, the central bearing unit (11) of the second roller journal (8) of the second roller (3) and, on the other hand, the inner bearing (9) and the outer bearing (10) of the second roller journal (8) of the third roller (4).

16. Roller device (1) according to claim 15.

24. tensile stresses are generated between the inner bearing (9) and the outer bearing (10) of the second roller journal (8) of the second roller (3) on the one hand, and the central bearing unit (11) of the second roller journal (8) of the third roller (4) on the other hand, in a mirror image with respect to the side of the first roller journal (7); and compressive stresses are generated between, on the one hand, a central bearing unit (11) of the second roller journal (8) of the second roller (3) and, on the other hand, an inner bearing (9) and an outer bearing (10) of the second roller journal (8) of the third roller (4).

16. Roller device (1) according to claim 15.

25. 25. Roller device (1) according to any one of the preceding claims, characterized in that the material to be rolled passes through each nip (5) alternately in reverse direction from nip (5) to nip (5).

26. 26. The roller device (1) according to any one of claims 1 to 25, characterized in that a corresponding roller position control unit (12) is provided between adjacent roller journals (7, 8) for generating tensile and compressive stresses, and a corresponding nip adjustment is performed by said roller position control unit (12).

27. 27. Roller device (1) according to claim 26, characterized in that the roller position control unit (12) comprises a pressure-controlled actuator (13).

28. 28. Roller device (1) according to claim 27, characterized in that the actuator (13) comprises a hydraulic, mechanical or electric actuator.

29. 29. The roller device (1) according to any one of claims 26 to 28, characterized in that the roller position control unit (12) is in operable connection with each of the bearing outer rings (14) of the bearings (9, 10, 11).

30. Roller device (1) according to any one of claims 13 to 29, characterized in that the central bearing unit (11) comprises one or more bearings.

31. Roller device (1) according to any one of the preceding claims, characterized in that the bearings (9, 10, 11) are rolling bearings and / or plain bearings.

Images