WO2013075883A1

WO2013075883A1 - Expander roller

Info

Publication number: WO2013075883A1
Application number: PCT/EP2012/070100
Authority: WO
Inventors: Sebastian Dienst; Hubert Bischof; Martin Breineder; Michael Wokurek; Ingo Steurer
Original assignee: Voith Patent Gmbh
Priority date: 2011-11-23
Filing date: 2012-10-11
Publication date: 2013-05-30
Also published as: DE102011086986A1

Abstract

The present invention relates to an expander roller W1, as used in paper production for example. The expander roller W1 has a shaft A with end axle bearings L, a hollow cylinder H with end axle bearings L', which encloses the shaft A at a radial distance S, and, arranged between the shaft A and the hollow cylinder H, at least one coupling element K1, which supports the hollow cylinder H and connects to shaft A in a rotatably fixed manner. The at least one coupling element K1 has a thickness of at least 5 mm in a radial direction, its maximum thickness being 50 mm. Furthermore, the at least one coupling element K1 is formed from an elastic material. A method for the production thereof is also disclosed.

Description

Spreader roll

The present invention relates to a spreader roller. Such rolls, which are also known by the name "spreader roll", are used in the production of bahrienförmigem material use.

After the formation of the sheet material, there is a risk that wrinkles will form during transport over rollers in the web. The reason is that the web-shaped material precedes with insufficient alignment and / or excessive deflection of successive rolls in the middle of the machine. Further, fluttering of the edge of the material may occur during transport of sheet material, which is undesirable.

Conventional spreader rollers have a spherical shape from the point of view of the sheet material in the direction of extent of the roller. This can be achieved in that the roller as a whole in the axial direction over a both sides to the center of the roll toward increasing diameter ^" has, and thus overall barrel-shaped .... Alternatively, it is also known this spherical shape by bending the roller as a whole or by bending a hollow cylinder of the roll., where the degree of bend is often adjustable to provide optimum adjustment of the roll

Mash pulp to allow.

Rollers whose Baliigkeit can be adjusted by bending a hollow cylinder, usually have a serving as a supporting body relatively rigid central while and a, relatively flexible, surrounding the rigid shaft Hohlzyl countries. This can be the rigid shaft and the hollow cylinder both be formed of fiber composite material. Both the rigid shaft and the hollow cylinder are mounted on both ends of the roller over a multi-ring bearing, which permits an adjustment of the curvature of the hollow cylinder and thus the crowning of the roller as a whole by means of a shaft bearing of shaft and honing. Such spreader rolls can be obtained under the name "CarboStretch" from Voith Paper Holding GmbH & Co. KG, St. Pöltener Str. 43, 89522 Heidenheim, Germany.

An example of a prior art spreader roll is described in document US 3,678,846. The underlying physics is introduced in the document "Make Fiat Sheet Using Contrabend Rolls" by Richard Palmer, presented at the AN EC 2000 conference.

Examples of sheet material passed between the rolls are paper webs in the paper industry or plastic webs in the plastics industry. In the paper industry, spreader rolls are used in the coating machine, in the calender, in the press section or during reeling. Be known iitten supported rollers .... is the storage of. Hohlzyiinder on the shaft unsatisfactory. Thus, high voltages can occur on the hollow cylinder in the region of the bearing on the time, or the displacement of the Hohlzyiinders may be insufficient.

It is an object of the present invention to provide a spreader roll, wherein the one hand, the occurrence of voltages ^■ in the hollow cylinder is avoided in the vicinity of the Koppelelernents, and dΓΊ tT ~ 3 d \. ü ü a sufficient adjustment of the

Hollow cyl inders is ensured.

The above object is achieved by the combination of the features of the independent claims. Preferred developments can be found in the subclaims.

Embodiments comprise a spreader roll, a shaft with end axle bearings, a hollow cylinder enclosing the shaft at a radial distance with end axle bearings and at least one coupling element arranged between the shaft and the hollow cylinder. The at least one coupling element carries the hollow cylinder and rotatably connects it to the shaft. The shaft can be solid or a hollow shaft. In this case, the at least one Koppe1e1ement in the radial direction on a strength, which is selected from the following areas: 5 mm - 50 mm, 5 mm - 40 mm, 5 mm - 30 mm, 10 mm - 50 mm, 10 mm. - 40 mm, 10 mm - 30 mm, 15 mm - 50 mm, 15 mm - 40 mm, 15 mm - 30 mm. Further, the at least one coupling element made of an elastic material qebildet.

In the context of this application, an elastic material is understood to mean a material whose elastic properties are determined by a proportion of elastic plastic contained therein. The elastic plastic does not have to be an elastomer in the chemical sense. The material ^' can be reinforced by additives, and for example in the form of a foam. Examples of suitable elastic plastics are: polyurethanes, thermoplastics, thermosets and elastomers, although other elastic plastics can be used. According to one embodiment, the elastic material is polyurethane. Next is understood in the context of this application under hollow cylinder, a body whose outer shape without external force substantially corresponds to a straight circular cylinder. In this case, "essentially" means that deviations by a maximum of 10% in the longitudinal direction and deviations in the radial direction by a maximum of 3% from the shape of a circular cylinder in the mathematical sense are permitted so that bulged or fitted hollow cylinders are permissible. Next, the body is hollow inside, ie it exists in einmontiertem state of the hollow cylinder, a space connecting the two base surfaces of the hollow cylinder. The wall thickness of the hollow cylinder can vary in the axial direction. Further, the hollow cylinder may be integrally formed or formed of a plurality of interconnected parts.

By choosing a coupling element made of elastic material and thus a material having a substantially lower hardness than the hardness of the hollow cylinder and the shaft, the occurrence of stresses in the hollow cylinder is effectively avoided. At the same time, the claimed strength of the at least one coupling element in the radial direction ensures a sufficient displacement of the edge regions of the hollow cylinder in the radial direction. Next allows the at least one coupling element by a suitable choice of the elastic material used and / or suitable dimensioning of the at least one coupling element adjustability of the bending line of the hollow cylindrical Indian and a clamping of the hollow cylinder relative to the shaft.

According to one embodiment, N coupling elements are distributed uniformly over the length of the hollow cylinder in the longitudinal direction of the hollow cylinder, wherein N is a natural number greater than or equal to 1. In particular, N can be equal to 2. Thus, the bending line of the hollow cylinder can also be adjusted via the number and arrangement of the coupling elements. For example, it can be ensured that the hollow cylinder is bent relative to its axial extent only in its edge regions, and extends straight in a central portion.

According to one embodiment, the spreader roller further comprises a coupling tube arranged in the radial direction between the shaft and the at least one coupling element, wherein the coupling tube in the radial direction in each case has a thickness of between 5 mm and 70 mm and made of metal or fiber-plastic composite and in particular carbon fiber reinforced plastic is formed.

By using the coupling tube, it is possible to keep the total thickness of the elastic material used for the at least one coupling element within limits and nevertheless to provide a large radial distance between the shaft and hollow cylinder and thus a large radial displacement of the hollow cylinder.

According to one embodiment, a bonding layer of fiber-plastic composite and in particular a fiber-plastic composite based on glass fibers and / or polyester fibers is arranged between the at least one coupling element and the shaft. This bonding layer facilitates a rotationally fixed connection of the at least one coupling element and the shaft, for example by bonding with epoxy resin. According to one embodiment, the binding layer is made of glass fiber fabric (Gels as tape).

According to one embodiment, the shaft is formed of a material selected from metal or Fiber-plastic composite and in particular

Carbon fiber reinforced plastic.

In your carbon fiber reinforced plastic, it may, for example, a pure carbon fiber reinforced plastic or even ^'to mixed composites made of carbon and glass, carbon and aramid or carbon and natural fiber manual close in this application. According to one embodiment, the hollow cylinder is formed from a material selected from metal or fiber-plastic composite and, in particular, rubber reinforced by plastic. In the context of this application, the fiber-plastic composite may alternatively also be, for example, a mixed composite of glass and aramid or glass and natural fibers or only glass. According to one embodiment, the material for the hollow cylinder and the shaft is selected so that the carbon cylinder with respect to the shaft has a lower rigidity. According to one embodiment, the spreader roll further has double eccentric bearings or multi-ring bearings arranged on both sides of the spreader roll, which bearings the end-side axle bearings of the shaft and of the hollow cylinder. Such bearings are described in patent EP 1 753 682 B1 and can be obtained, for example, from Schaeffler KG, Industriestraße 1-3, 91074 Herzogenaurach, Germany.

According to one embodiment, the length of the at least one coupling element in the longitudinal direction of the shaft and of the hollow cylinder is between 500 mm and 1,500 mm. The cylinder in the radial direction between the shaft and the hollow existing distance is measured according to a form of leadership from the unloaded roller and unbent hollow cylinder adjacent to at least one coupling element. The length of the at least one coupling element is the maximum extent of the at least one coupling element in the unloaded state along the longitudinal direction of the shaft.

According to one embodiment, the at least one coupling element in the longitudinal direction of the shaft and the hollow cylinder on two end sides, which at least in a section mi of the shaft a minimum angle of between 30 ° and 60 ° and in particular between 40 ° and 50 ° and more particularly 45 °. The inclination of the end faces is at least in this section selected so that the at least one coupling element contacted the shaft or the coupling tube over a greater length than the hollow cylinder '. The radial extension of the at least one Koppeielements thus takes ^' ramps in this section, starting from the shaft.

According to one embodiment, the at least one coupling tube has, in the longitudinal direction of the shaft and the hollow cylinder, two end faces which, at least in one section with the shaft, have a smallest angle of between 30 ° and 60 ° and in particular between 40 ° and 50 ° and more particularly 45 °. Here, the inclination of the end faces in this section is chosen so that the 'at least one coupling tube contacts the shaft over a greater length than the Koppeleiement. The radial extension of the at least one coupling tube thus increases in this section, starting from the ramp-like ramp. According to one embodiment, the Hohizyiinder in the radial direction has a wall thickness of between. 5 mm and 20 mm. According to one embodiment, the shaft in the radial direction has an outer diameter of between 100 mm and 700 mm.

The axial length of the hollow cylinder and the shaft is between 5000 mm and 12000 mm according to one embodiment.

In embodiments, the at least one coupling element supports the Hohizyiinder on its entire Innenutnfang. For example, the coupling element may be rotationally symmetrical, and the ^" wave surrounded annular.

According to embodiments, the at least one coupling element is formed from the same material as the shaft or the hollow cylinder. According to one embodiment, the coupling element is formed integrally with the shaft or the hollow cylinder, according to another

Embodiment, the coupling element is formed in addition to the while and the hollow cylinder as a separate part. For example, the coupling element may be formed of a fiber-plastic composite.

Embodiments of a method for producing a spreader, in particular a roller as described above, comprise the following steps:

Providing a shaft with end axle bearings, rotationally fixed N of the shaft along its circumference completely ^' surrounding coupling elements made of an elastic material, wherein the N coupling elements are arranged uniformly distributed over the length of the hollow cylinder, and wherein a natural number greater is 1 and especially 2; Provision of a hollow cylinder, wherein a fit between the Innendu diameter of the hollow cylinder and the outer diameter of the coupling element is a press fit, and introducing the shaft with the at least one coupling element in the hollow cylinder. In this case, the at least one coupling elements in the radial direction has a thickness of at least 5 mm and in particular of at least 10 mm and more particularly of at least 15 mm, and at the same time a. Thickness of at most 50 mm and in particular of at most 40 mm and more particularly ^' of at most 30 mm.

Embodiments of the invention will be explained in more detail below with reference to FIGS. In the figures, the same or similar elements are given the same or similar reference numerals. Showing:

Figure 1A is a first. Embodiment of a

Spreader roll in cross section;

FIG. 13 shows a second embodiment of a

Spreader roll in cross-section, -

FIG. 2A is a cross-sectional view of a third embodiment of a spreader roll based on the first embodiment; and

Figure 2B is based on the second embodiment fourth embodiment of a spreader roller in cross section.

It is emphasized that in FIGS. 1A, 1B, 2A, 2B, due to the rotational symmetry of the rolls shown, only the cross section through a half spreader roll is shown. By mirroring at the Symmeurieebene P is in each case obtained a cross section through a complete roll.

FIG. 1A shows a first embodiment of a spreader roll 1.

.The spreader roll Wl has a shaft supported by two bearings L A ^■ formed in the Vorges ellten embodiment of a tube of plastic kohlenfaserverstärkteict. Alternatively, it may, for example, be a solid shaft or hollow shaft made of steel or a fiber-plastic composite other than carbon fiber reinforced plastic. In the embodiment shown, the shaft has a length of 12 m and an outer diameter of 70 cm. However, the present invention is not limited to these dimensions.

In a central region of the shaft A, an annular coupling element Kl made of polyurethane with a radial thickness of 20 mm is non-rotatably attached by gluing over .An binding layer Bl from a mixture of glass fiber fleece and polyester fleece with epoxy resin. Alternatively, the coupling element Kl also off. be formed of another elastic material such as thermoplastic, thermosetting plastic and elastomer. The length of the coupling element Kl in the longitudinal direction of the shaft A and the hollow zyi Indian H corresponds to the fold of existing in the radial direction between the shaft A and the hollow cylinder H distance S. The coupling element Kl has in the longitudinal direction of the shaft A and the hollow cylinder H two end faces F, which with the shaft a smallest angle α of 50 ° include. In this case, the inclination of the end faces F is chosen so that the radial extent of the coupling element Kl increases starting from the shaft A ramp-shaped. The present invention is however, not limited to the above dimensions and angles.

The annular coupling element Kl carries a hollow cylinder H with end-side axle bearings L ', soft hollow cylinder H is formed in the embodiment shown from glass fiber reinforced plastic and has a constant wall thickness. Alternatively, the hollow cylinder may be formed of steel or a glass fiber reinforced plastic ^' different fiber-plastic composite. The material used for the hollow zyiinder is preferably selected so that the hollow cylinder has a lower rigidity than the shaft. In the embodiment shown, the hollow cylinder has a length of 12.25 m and an outer diameter of 77 cm. The wall thickness is 15 mm. However, the present invention is not limited to these dimensions.

The axle bearings L, L 'of the shaft A and of the hollow cylinder H are received in the embodiment shown by a double eccentric bearing arranged on both end faces of the spreader roller. The double · eccentric bearing is not specifically shown. By means of the double eccentric bearing a targeted bending of the end faces of the hollow cylinder H is possible.

FIG. 1B shows a second embodiment of a spreader roll W2. The second embodiment shown in FIG. 1B is based on the first embodiment shown in FIG. 1A, so that in the following only ^' differences are dealt with and otherwise reference is made to the first embodiment described above. The second embodiment shown in ^■ Figure 1B differs from that shown in Figure 1A, the first embodiment in that two uniformly distributed over the length of the hollow cylinder H in the longitudinal direction of the hollow cylinder H arranged coupling elements K2, K2 'with associated tie layers B2, B2' are provided.

Further, the flank angle α of the coupling elements K2, K2 'in the second embodiment ^' form 60 ° and not 50 ° as in the first embodiment.

By using two coupling elements K2, K2 ', the area in which a. Bending the end faces of the hollow cylinder H causes a crowning or convex deformation of the lateral surface of the hollow cylinder H, be limited to definable edge regions.

FIG. 2h shows a third embodiment of a spreader roll W3. The third embodiment shown in FIG. 2A is based on the first embodiment shown in FIG. 1A, so that in the following only differences will be discussed and otherwise reference is made to the first embodiment described above.

In addition to the first embodiment shown in FIG. 1A, the spreader roll W3 additionally has a coupling tube R1 arranged in the radial direction between the shaft A and the coupling element K. The coupling tube R1 has a thickness of 5 mm in the radial direction and is formed from carbon-fiber-reinforced plastic. The coupling tube Rl has in the longitudinal direction of the shaft A and the hollow cylinder H on two end faces F ¹ , many with the shaft a smallest angle a 'of 45 °. The inclination of the end faces F 'is chosen so that the Radial extent of the coupling tube Rl increases starting from the shaft A ramp-shaped. However, the present invention is not limited to the above. Dimensions, angles and materials limited.

By using the coupling tube Rl, the distance between the shaft A and hollow cylinder H and thus the radial Versteliweg the hollow cylinder can be increased. Accordingly, the bonding layer 31 between the coupling tube Rl and Koppelele ent Kl is arranged.

The fourth embodiment of a spreader roll W4 shown in FIG. 2B is a combination of the second and third embodiments shown in FIGS. 1B and 2A, so that reference is made to the second and third embodiments described above.

It is emphasized that the embodiments described above are exemplary only and not intended to limit the scope of the claims. ^' This applies in particular to those specified for the shaft, the at least one coupling element and the hollow cylinder ^' materials. Also, the length and width ratios of the rolls shown are chosen to better representability, not to scale.

Claims

claims

Spreader roll (Wi, W2, W3, W4), comprising:

a shaft (A) with end axle bearings (L);

one the shaft (A) in a radial distance (S) enclosing hollow cylinder (H) with end-side

Axle bearings (L ^[ ); and

at least one between the shaft (A) and the hollow cylinder (H) arranged coupling element (Kl; K2, K2 ¹ ), which carries the hollow cylinder (H) and rotatably connected to the shaft (A) connects;

wherein the at least one coupling element (K1; K2, K2 ') in the radial direction has a thickness of at least 5 mm and in particular of at least 10 mm and more particularly of at least 15 mm, and at the same time a thickness of at most 50 mm and in particular of at most 40 mm and more particularly of at most 30 mm; and

wherein the at least one coupling element (K1, K2, K2 ¹ ) is formed from an elastic material.

Spreader roll (W1, W2, W3, W4) according to claim 1, wherein in. Longitudinal direction of the hollow cylinder (H) N coupling elements (Kl; K2, K2 ') are distributed uniformly over the length of the coal cylinder (H), and

where N is a natural number greater than or equal to 1 and in particular equal to 2.

Spreader roll (W1, W2, W3, W) according to claim 1 or 2,

further comprising in each case one in the radial direction between the shaft (A) and the at least one Coupling element (K2, K4, K ') arranged coupling tube (R1, R2, R2 ¹ ),

wherein the coupling tube (Rl; R2, R2 ¹ ) in the radial direction in each case has a thickness of between 5 mm and 70 mm and is formed from metal or fiber-plastic composite and in particular carbon fiber-reinforced plastic.

Spreader roll (Wl; 2; W3; W4) according to one of claims 1 to 3, wherein between the at least one coupling element (K1; K2, K2 ') and the shaft (A) a bonding layer (Bl; R2, B2') of fiber Plastic composite and in particular a fiber-synthetic material composite is arranged on the basis of glass fibers and / or polyester fibers.

Spreader roll (W1, W2, W3, 4) according to one of claims 1 to 4,

wherein the shaft (A) is formed of a material selected from metal or fiber-plastic composite and in particular carbon fiber reinforced plastic; and or

wherein the hollow cylinder (H) is formed of a material which is selected from metal or fiber Kuns composite material and in particular glass fiber reinforced plastic ..

Spreader roll (W1; W2; W3; W4) according to any one of claims 1 to 5, further comprising on both sides of the spreader roll. (Wl; W2; W3; W4) arranged double eccentric bearings or multi-ring bearings which support the end axle bearings (L, L ') of the shaft (A) and the hollow cylinder (H).

Pulps stretching roller (Wl; W2; W3; W4) according to one ^'of the wherein the length of the at least one coupling element (K1; K2, K2 ') is between 500 mm and 1,500 mm in the longitudinal direction of the shaft (Ä) and of the hollow cylinder (H).

Spreader roll (W1 W2 3, W4) according to one of claims 1 to 7,

wherein the at least one coupling element (K1; K2, K2 ') and / or the coupling tube (R1, R2, R2') has two end faces (F F ') in the longitudinal direction of the shaft (A) and the hollow cylinder (H) with the shaft (A) a smallest angle {α; α ') of between 30 ° and _. 60 ° and in particular between 40 ° and 50 ° and more particularly include 45 °; and

wherein the inclination of the end faces (F; F ') is selected such that the at least one coupling element (K1; K2, K2') or coupling tube (R1; R2, R2 ') has the shaft (A) over a greater length than the one Hollow cylinder (H) contact iert.

Spreader roll (W1, W2, W3, W4) according to one of claims 1 to 3,

wherein the hollow zyl inder (H) in the radial direction has a wall thickness of between 5 mm and 20 mm; and or

wherein the shaft (A) in the radial direction an outer diameter of between ^' 100 mm and 700 mm on ice.

Method for producing a spreader roll (W1, W2, W3, W4), in particular a roll according to one of claims 1 to 9, comprising the following steps: (S1) providing a shaft (A) with an end face

Axle bearings (L);

(S2) Rotationally arranging N the shaft. (A) completely surrounding its circumference ^" Coupling elements (K1, K2, K2 ') of an elastic material, which in the radial direction have a thickness of at least 5 mm and in particular of at least 10 mm and more particularly of at least ^" 1.5 mm, and at the same time a thickness of at most 50 mm and in particular of at most 40 mm and more particularly of at most 30 mm, the N coupling elements (K1, K2, K2 ') being distributed uniformly over the length of the hollow cylinder (H), and where N is a natural number greater than and equal to 1 is equal to 2;

(53) providing a hollow cylinder (H), wherein a fit between the inner diameter (i) of the hollow cylinder (H) and the outer diameter (R2) of the coupling element (K1, K2, K2 ¹ ) is an interference fit; and

(54) introducing the shaft (Ä) with the at least one coupling element (K1, K2, K2 ') into the hollow cylinder