DE102009000425A1 - roller - Google Patents

Abstract

The invention relates to a roll having a dimensionally stable about an axis of rotation, a modulus of elasticity of at least 10,000 N / mm in both circumferentially and in the axial direction having jacket (27) having at least one contact shoe (28) in a Anpresssystems (1), wherein the pressure shoe (28) has at least one pressing element (2, 2a, 2b) and can be displaced radially to the axis of rotation. In order to provide such a roller for high compressive stresses, which has a reliable lubrication effect between pressure shoe (28) and sheath (27) without great effort, it is ensured according to the invention that the pressure shoe (28) or sheath (27) has an elastic pressure cushion (22). and in the axial direction at least two pressing elements (2, 2a, 2b) are arranged side by side, which are arranged on a fixed support (26) movable independently of each other, wherein the support (26) extends parallel to the axis of rotation.

Description

The invention relates to a roll having a dimensionally stable about an axis of rotation, a modulus of elasticity of at least 10,000 N / mm ^{2 in} both circumferential and axial direction having coat having at least one contact shoe in a Anpresssystem, wherein the contact pressure shoe has at least one pressing element and is displaceable radially to the axis of rotation.

such Rollers are used, for example, as deflection rolls or Shoe rolls used in paper or board making, where they in conjunction with a counter-pressure element, a so-called nip form, through which the paper or board web is guided. The counter-pressure element is usually a counter-roller, which is designed as a hard or soft roller, but can also by be formed a circumferential band.

There are, for example, shoe rollers in which the circumferential jacket is constructed of a flexible plastic or composite material. Such a jacket does not fall under the definition of the aforementioned roller with a "dimensionally stable jacket", ie a jacket with a modulus of elasticity of at least 10,000 N / mm ^{2 in} both the circumferential and in the axial direction. The cross-section of such a jacket does not remain essentially round when it is pulled off the axle and hangs up on the floor. Such a roll is therefore referred to in this application as state of the art, because nowadays the lubrication between the pressure shoe and the flexible sheath is usually realized hydrodynamically with a lubricant located inside the roll (usually oil). The roller is thus formed by a circumferential jacket, the z. B. is guided over a plurality of guide rollers, so that it does not rotate in any case on a circular path. The rotation axis is then a fictitious axis. In the interior, which is enclosed by the circumferential jacket, a pressure system is now arranged, with the help of the rotating jacket can be pressed against the counter-pressure element. For this, the contact pressure system generally has a pressure shoe, which is displaceable radially to the axis of rotation. The surface of the pressure shoe is often adapted to the radius of the counter-pressure element in order to achieve a homogeneous pressure profile in the nip. However, it is also known to produce the contact shoe made of an elastically compressible material, so that the contact shoe largely adapts to the counter-pressure element.

at Such a flexible jacket of the pressure shoe is so common concave shaped or assumes a comparable shape. Leading due to the nip length (in the circumferential direction) and because of of the sheath material limited force application possibility too low compressive stresses in the nip, not for all Paper types are suitable to z. B. the desired gloss and to achieve smoothness values.

The Pressing system must be individually tailored to the respective requirements, especially adapted to the width of the shoe press roll. This causes correspondingly high costs in the production. Often The press system also has a fixed yoke around it the coat of the shoe press roll rotates, connected and through the Yoke supplied with supply lines. For maintenance and repair work This is usually initially a removal of the roll shell necessary before the pressing system is accessible. At a Replacement of the contact shoe is one in exactly the same Size manufactured press shoe required.

alternative To this roller of the prior art, are numerous rollers known, which is also called deflection adjustment rollers. they have one dimensionally stable sheath of metal or composite material. The nip length in web direction is limited to the the external force introduction caused flattening the two rolls. Such rolls have a much higher Strength and maximum compressive stresses in common Achieve nip. However, the structure of such a roller is uneven complicated. The pressing elements can only in the frame be hydrodynamically lubricated by emergency running properties. In such Rollers are generally hydrostatic in operation Lubrication essential to make a rubbing contact between Coat and press shoe to avoid. The shoe is right from the start very complex calculation and grinding technique the inner radius the coat adapted, because the coat in the operation of its shape, apart of slight deformations, maintains. Often have to All existing pressing elements with separate lubricant lines be supplied, what the cost and effort to manufacture such a roller additionally increased.

Also in the closest to the invention and at the time of filing this invention unpublished prior art, the DE 10 2007 000 662 , it has not been thought to apply the following object to a roll having a dimensionally stable sheath.

Of the The invention is thus based on the object, a dimensionally stable roller to provide for high compressive stresses without great Expense a reliable lubrication effect between pressure shoe and Coat has.

According to the invention this task in a roller of the type mentioned by solved that the pressure shoe an elastic pressure pad has and in the axial direction at least two pressing elements next to each other arranged independently on a fixed support are arranged movable from each other, wherein the carrier extends parallel to the axis of rotation. In the direction of rotation of dimensionally stable shell is lubricated on the inner circumference (usually oil) entrained in the inlet gap between the jacket and press shoe. The pillow behaves in this case like the elastic and flexible coat of a conventional shoe roll and deviates to enlarge the gap between jacket and pressure shoe, to the extent that it is necessary to maintain a hydrodynamic lubrication effect between jacket and contact shoe necessary is.

Preferably the shell is made of a steel or cast iron or one Composite material of a matrix material, in particular epoxy resin, and reinforcing inserts of fibers, in particular aramid or glass fibers. The latter sheath material may possibly also still provided with a hard and smooth metal or ceramic layer be.

One Such sheath material is particularly suitable for high compressive stresses suitable.

Similar to that unpublished at the time of application of this invention DE 10 2007 000 662 the contact shoe can be constructed in modules. In the axial direction, ie parallel to the axis of rotation of the rotating jacket, a plurality of pressing elements is arranged side by side, which are constructed identically. The width of a pressing element is for example 125 mm. By an appropriate choice of the number of contact elements now any widths can be realized. Thus, the pressure system can be adapted to different widths of the rotating jacket. Intermediate sizes can be produced by arranging sheet metal pieces between individual pressing elements. As a result, steady pressure conditions are achieved. Since a single contact element is relatively small, this can be produced with less effort compared to conventional contact elements. The contact elements are z. B. on small machines to produce, which costs can be saved. In this case, the pressing elements can be made for example of metal in investment casting or die casting, sintered materials or fiber-reinforced plastics. For maintenance work, it is possible to remove individual contact elements and replace them if necessary. Maintenance work can be carried out quickly and easily. The pressure shoe extends in the axial direction over the width of the circumferential jacket. The circumferential jacket can be pressed by means of the pressure shoe against a counter-pressure element by being moved radially to the axis of rotation of the rotating jacket. This movement takes place by a movement of the pressing elements in relation to the carrier, wherein the Anpresskissen is supported by the contact elements almost continuously. The Anpressele elements are therefore arranged directly next to each other. As a rule, all the pressing elements are moved uniformly. To set a transverse profile, however, it is possible to move the pressing elements also different. A small difference in movement is sufficient. Due to the closely arranged pressing elements, it is possible to use a very flexible and continuous over the axial length Anpresskissen, since this is almost completely supported on its underside by the contact pressure. The carrier, on which the pressing elements are arranged and which is not moved together with the circumferential jacket, extends parallel to the axis of rotation of the circulating jacket, so that all pressing elements can be arranged axially next to one another on the carrier. Under a parallel arrangement, of course, an arrangement of the carrier on the rotation axis is included. Due to the sectional construction of the pressing elements can be dispensed with special correction means for reducing or increasing the contact pressure at both ends of the shoe.

preferably, is each contact element via at least one actuator with in contact with the wearer. Each pressing element thus provides a complete unit. This can be the connection to the carrier indirectly or directly produced become. Is z. B. an actuator defective, a simple exchange takes place the entire pressing element together with the actuator. The repair This can be done in a relatively short time. If every pressing element There may also be differences with at least one actor in the contact pressure and pressure peaks between adjacent contact elements be avoided.

Preferably each pressing element has at least two actuators which rotate in the direction of rotation of the Mantels are arranged one behind the other. With the help of two actuators Already the pressure profile in the nip can be adjusted. It is desirable at the beginning of the nip a lower pressure to exercise on the web than at the end of the nip. This can be realized with two actuators. In addition, influence on the geometry of the hydrodynamic lubrication gap.

Preferably, the Anpressele ment at least one guide element which prevents movement of the contact shoe in the circumferential direction. The contact shoe should actually only be linearly movable in the pressing direction, that is to say essentially perpendicular to the direction of rotation and to the axis of rotation. A guide element can now ensure that the pressure shoe can only perform the desired movement, and is not taken in the direction of rotation through the jacket. As a result, the cylinder-piston pairing is relieved, since this no longer needs to absorb lateral leadership. By arranging the guide element on a front side in the direction of rotation of the pressure shoe, tilting of the pressure shoe relative to the guide element is largely prevented, so that only slight frictional forces occur between the guide element and the pressure shoe. The guide element may be part of the base plate, but also as an independent fastener z. B. serve for the base plate to a yoke of the shoe press roll.

Especially It is favorable if two parallel guide elements are present, so that the pressure shoe from both sides of the roller can be pushed onto the guide elements and thus the hydrodynamic lubricating film in both directions of rotation of the jacket can be realized.

Preferably is the Anpresskissen form-fitting in the direction of rotation in the contact pressure held. The Anpresskissen is so to speak in the contact pressure embedded. A movement of the pressure pad caused by the friction the lubricating film between the rotating jacket and the Anpresskissen could be evoked, so reliable prevented. Other elements are not necessary.

Preferably, the Anpresskissen on an E-modulus between 1 KN per mm ² and 4.5 KN per mm ² . Such an E-module is about 50 to 150 times smaller than the modulus of elasticity of steel. By such a low modulus of elasticity, the Anpresskissen can deform evenly due to the entering between the shell and the cushion lubricant. In order to make the lubricating film effective at all rotational speeds and compressive stresses in the nip, the exact modulus of elasticity must be determined in advance in experiments or by suitable calculation methods. The pressure distribution is thereby evened out, whereby pressure peaks are avoided.

preferably, the pressure system has at least one pressure line, which is extends axially over the contact elements. about This pressure line can be the actuators that usually Cylinders are to be supplied with pressure medium. This will all Cylinder subjected to the same pressure. The connection of Cylinder with a pressure source is therefore very simple, as the Pressure source only connected to the pressure line at one point must become. A complex distribution system can be omitted.

preferably, is the pressure line formed as a cavity in the pressing elements, extending from a first end face to a second end face the pressing elements extends. The pressure line is so through the shape of the pressing elements formed. For example the cavity thereby be made as a bore. A damage this pressure line is different from additional Pressure pipes almost impossible.

preferably, have the pressing elements at one end of the cavity an extension and at the other end of the cavity a recess, wherein the preferably cylindrical inner contour of the recess approximately an outer contour of the Fortsatzes corresponds and at least a slight axial Displaceability and tiltability of the contact shoe ensured is. The pressing elements can thus in the region of the pressure line be plugged into each other. It can between the extension and the recess also provided an additional seal be to better seal the pressure line between the crossing points to ensure between the individual contact elements. It is advantageous if the extension has a round cross-section has, in which case the recess, for example, as a blind hole can be produced.

Preferably are in the axial direction juxtaposed cylinder with the connected to the same pressure line. The number of pressure lines corresponds So a number of arranged in the direction of rotation one behind the other Actuators. Now all are arranged side by side in the axial direction Cylinders connected to the same pressure line, these too pressurized with the same pressure, so that a more even Pressure is exerted in the nip. An additional regulation is not required. Now be the front in the direction of circulation Cylinder subjected to a different pressure than that in the direction of rotation rear cylinder, resulting in a corresponding different Can be applied to the respective pressure lines, can the pressure profile can be influenced in the web running direction.

The pressing system preferably has a connecting element which extends through an axial recess in the pressing elements. By this connection element, the position of the pressing elements can be fixed to each other in a simple manner. The connecting element can at For example, be designed as a rod or as a rope.

Preferably is on the front sides of the pressing elements in the region of the recess a contact surface arranged axially over the end faces protrudes. Through this contact surface, the position of the pressing elements defined to each other. So it's enough, just this contact surface to produce in a corresponding accuracy. The rest of the area The pressing elements can have a greater tolerance exhibit. As a result, the pressing elements are at a minimum Processing effort produced, with z. B. in investment casting after Shaping no further processing is necessary.

preferably, is a continuous between the Anpresskissen and the contact pressure Intermediate element arranged. Through this intermediate element, for example As a continuous sheet is formed, line force differences minimized at the contact points between pressing elements, so that produces a uniform pressure curve in the nip becomes.

preferably, is a remote from the contact surface of the Anpresskissens with covered by a sliding foil. This sliding film has the task the friction between the rotating jacket and the elastic Reduce cushions. Although usually between the Anpresskissen and the jacket has a hydrodynamic lubricant film, Such a film has proven to be advantageous. At low Speeds will wear out due to the sliding foil Friction partner prevented. The sliding film can for example be made of metal. The Anpresskissen must then no having friction-resistant surface more, so that z. B. temperature-resistant plastics that provide high flexibility can be used.

preferably, is the sliding film on at least one edge on the pressing elements attached. The position of the sliding foil in relation to the pressure shoe is thereby fixed. Due to the movement of the contact shoe in relation to Carrier takes place but no relative movement between the sliding foil and the Anpresskissen, thereby avoiding wrinkling becomes. The movement of the contact shoe is thereby through the sliding film not handicapped.

In a preferred embodiment, the Anpresssystem at least one base plate in contact with the actuators is. This base plate can be formed either axially continuous be or in size in each case the size correspond to a contact pressure element. The connection between the actuators and the carrier is made over the base plate. The carrier itself then only has relatively simple attachment options for the base plate. A use of others Actuators then only need an exchange of the base plate, while the fixed carrier unchanged can stay. As a result, an easier adaptation of the Anpresssystems later changes possible.

preferably, The actuators are slidable and pivotable on the base plate stored. This makes it possible, the effective direction of Adjust actuators individually and thus influence the pressure profile.

Preferably is arranged between each pressing element and the base plate a return device. This return device pulls the pressure shoe in the direction to the base plate. The restoring device may be, for example be formed by a spring between the contact pressure element and the base plate is arranged or between the pressing member and the piston in the region of the cylinder.

advantageously, is the contact shoe with the actuators and the base plate as a unit formed, in particular parallel to the carrier in the roller is insertable. This unit, so with the pressure shoe with belong to the actuators and the base plate and if necessary also the restoring device, then, for example be axially pushed onto the carrier.

A Assembly or disassembly then requires no removal of the circulating Jacket. In this case, the contact shoe already before the arrangement in Interior of the rotating jacket pre-assembled on the base plate are needed, so that requires little time for an assembly becomes.

preferably, there is a pressure feed to at least one end of the cavities and / or in the middle of the pressing system and / or in several positions. As a rule, it is sufficient, the cavities only to provide pressure at one point. By feeding the pressure in several positions, however, the pressure build-up can be evened out become. A pressure feed at the ends of the cavities has the advantage that they are easily accessible. A feed in the middle of the Anpresssystems has the advantage that the pressure build-up takes place symmetrically within the system.

Preferably, the Anpresssystem on a connecting line, which is connected axially non-force on the pressing elements. Axial force-free means that the connecting line is free to move axially at least over a certain range. The connection line can be considered as essentially flexible, in the axial direction but slightly stiffer trained hose be formed. A flexibility of the connecting line in the pressing direction has the advantage that the movement of the pressing elements is compensated by the connecting line, so that they can be connected to a fixed, immovable supply connection. The connection line can be inserted directly into the cavities of the pressing elements. Due to the axial force-free storage, the connection line is then displaceable within the cavities.

alternative can be taken advantage of that coat has on the inner circumference an elastic Anpresskissen and in Axial direction at least two contact elements arranged side by side are independent of a fixed carrier are arranged movable from each other, wherein the carrier extends parallel to the axis of rotation. In this case, the soft becomes Cushion connected to the inner circumference of the roll shell and leads with each revolution in the nip such an evasive compression by that a hydrodynamic lubricant film has existence.

For this variant, it makes sense that the surface of the Contact shoe made of metal is formed. While in the before described main outline the contour of the lubrication gap is determined by the radius of the shell on the inner circumference and the Dodge pad on the press shoe, it is accurate in this case vice versa. Here the shoe retains its convex shape during of the Anpressvorgangs, and the inner wall of the shell has by the attached cushions, the possibility to dodge and the maintain hydrodynamic lubrication gap.

The Invention will be described below with reference to a preferred embodiment described in more detail in connection with the drawing. Herein show:

1 a schematic plan view of a pressing system,

2 a partial cross section through a roller according to the invention or the Anpresssystem,

3 a detailed view of the return device,

4 a detailed view of the connecting cable and

5 an alternative schematic plan view of a contact pressure system.

In 1 is a pressure system 1 shown, the two juxtaposed contact elements 2a . 2 B having. As a rule, however, more than two pressing elements are used. The pressing elements 2a . 2 B have two cavities 3a . 3b . 4a . 4b on, which are each connected to each other and thus each form a pressure line. The cavities 3a and 4a extend from a first end face 5a of the pressing element 2a to a second end face 6a of the pressing element 2a , The cavities 3b and 4b extend accordingly from a first end face 5b to a second end face 6b of the pressing element 2 B ,

At the front ends 5a . 5b have the contact elements 2a . 2 B in the region of one end of the cavities 3a . 3b . 4a . 4b projections 7a . 7b . 8a . 8b on and on their second faces 6a . 6b corresponding recesses 9a . 9b . 10a and 10b , The extensions 7b . 8b can do this in the corresponding recesses 9a . 10a of the pressing element 2a be introduced. This is a plug connection between the pressing elements 2a and 2 B , The extensions 7b . 8b are each with a ring seal 11 . 12 provided for a secure seal between the pressing elements 2a . 2 B to care.

The two contact elements 2a . 2 B have an axial recess 13a . 13b on, through which a connecting element 14 is guided, the secure hold of the pressing elements 2a . 2 B serves. It is sufficient if through the connecting element 14 the contact elements 2a . 2 B pressed together so that the connecting element 14 for example, can be designed as a wire rope. The pressing elements 2a . 2 B are axially arranged as close to each other as possible, so that while a relative movement between individual contact elements 2a . 2 B is possible, but a Anpresskissen is almost supported over the entire surface, so that steady pressure conditions are achieved. A gap between the pressing elements 2a . 2 B is therefore kept minimal.

In the area of the axial recess 13a . 13b is at the second end faces 6a . 6b the pressing elements 2a . 2 B one contact point each 15a . 15b arranged axially over the end faces 6a . 6b projects by about 0.01 mm to 1 mm. The pressing elements 2a . 2 B Therefore, they touch only in the area of these contact points 15a . 15b ,

The pressing elements 2a . 2 B each have a front in the direction of rotation cylinder 16a . 16b on. The front cylinders 16a . 16b are over stubs 17a . 17b with the cavity 3a . 3b connected and so can through the cavities 3a . 3b be subjected to the same pressure.

Furthermore, the pressing elements 2a . 2 B each one in the direction of rotation rear cylinder 18a . 18b on, over stubs 19a . 19b With the cavities 4a . 4b are connected. The rear cylinders 18a . 18b So also be pressurized by the cavities 4a . 4b subjected to the same pressure.

The pressing elements 2a . 2 B each have two wells 20a . 20b . 21a . 21b on, in the corresponding formations of a Anpresskissens can be introduced, so that the Anpresskissen safe to the pressing elements 2a . 2 B is held.

In 2 is now a partial cross section of the roller according to the invention 50 and a cross section of the pressing system 1 shown. The same parts are provided with the same reference numerals, however, for the sake of clarity, the letter indices are omitted. Above the contact element 2 is a pressure pad 22 arranged, wherein the pressing element 2 two projections 23 . 24 which has the Anpresskissen 22 hold positively in the direction of rotation.

The pressure system 1 has a base plate 25 on, with it on a carrier 26 the roller 50 is attached. The roller 50 has a circumferential dimensionally stable shell 27 whose modulus of elasticity is at least 10000 N / mm ^{2 in} both circumferential and axial directions. The pressure pad 22 forms together with the contact pressure element 2 a contact shoe 28 , with the help of two as a piston-cylinder pairing formed actuators 29 . 30 linear from the carrier 26 away against the coat 27 can be pressed. There are two pistons for this 31 . 32 provided on the base plate 25 support. For better sealing ring seals can be used on the pistons 33 . 34 be provided.

By pressurizing the cylinder 16 . 18 which over the cavities 3 . 4 takes place, the pressing element 2 together with the pressure pad 22 against the surrounding coat 27 pressed, leaving the coat 27 against a counter element 35 is moved. The counter element 35 forms together with the coat 27 a nip 36 which has a length between 5 and 60 mm, in particular between 10 and 40 mm. According to the direction of rotation 40 would be at 2 a web, preferably a paper web from the left into the nip 36 enter and be treated there under a high compressive stress.

The Anpresskissen is soft and deforms according to the lubricant entering between it and the jacket so that a hydrodynamic sliding lubrication is maintained. The lubricant is taken over the friction on the jacket and him the contact area between the shell 27 and pressure pads 22 entered. So if in the following of a contact between Anpresskissen 22 and coat 27 the speech is, it is to be understood that there is a gossamer lubricant film in between.

The pressure profile in the nip 36 is due to the pressurization of the cylinder 16 . 18 determined, but also by the material and the shape of the Anpresskissens 22 , The pressure pad 22 consists in this imple mentation example of a temperature-resistant plastic. But other elastic materials are conceivable. By shaping the cushion or different elasticities different pressure profiles can be defined in advance. A change of the pressure profile can then by a simple replacement of the Anpresskissens 22 take place, which is especially true in a solution with only one actuator 29 . 30 is cheap.

Because the pressure pad 22 is almost completely embedded in the pressing, the requirements for an inherent rigidity of the Anpresskissens 22 low. The pressure pad 22 can at its from the pressing element 2 groundbreaking surface 37 in contact with the encircling coat 27 comes, have a sliding surface, for example, vulcanized. It is also conceivable Metallbedampfung. In this embodiment, the surface is 37 with a sliding foil 38 covered, providing a direct contact between the Anpresskissen 22 and the coat 27 prevented if the lubricant film breaks for some reason. The sliding foil 38 is made of a metallic material and reduces the friction of the shell 27 , Despite the usually acting lubricant between the jacket 27 and the pillow 22 is the life of the Anpresskissens 22 through such a sliding foil 38 extended. The sliding foil 38 is at its front edge in the circumferential direction 39 on the pressing element 2 attached. During a movement of the contact shoe 28 becomes the sliding foil 38 with moving, causing a wrinkling or warping against the Anpresskissen 22 is avoided. The direction of rotation of the jacket 27 is by a directional arrow 40 characterized.

For absorbing side forces caused by the movement of the mantle 27 on the contact shoe 28 act is a guiding element 41 vorgese hen, at a front in the direction of rotation of the Anpressschuhs 28 to the contact pressure element 2 attacks. As a result, a wedging or tilting of the contact shoe 28 when starting, ie when high friction coefficients occur. At the same time it is achieved that the actuators 29 . 30 no side managers need to muster.

The guide element 41 serves at the same time for fixing the base plate 25 on the carrier 26 , In addition, the base plate 25 still with a second guide element 42 on the carrier 26 attached. The second guide element has the advantage that the contact element 2 can be inserted from the other end of the roll to reverse the direction of rotation. The base plate 25 may be either continuous or segmented, with the dimensions of the base plate 25 then the axial length of the contact pressure element 2 should correspond.

The pressure pad 22 is for all pressing elements 2 together, ie in the axial or longitudinal direction continuously. To avoid line force differences at the connection points between the pressing elements 2 is between the pressing elements 2 and the pressure pad 22 a continuous intermediate element 43 arranged, which is formed for example as a thin metal sheet. It is also conceivable, by a corresponding toothing of the pressing elements 2 Line force differences at the joints to avoid.

By supplying the longitudinally juxtaposed actuators 29 respectively. 30 with the same pressure is a simple pressure supply through the cavities 3 . 4 possible. When using only one actuator 29 . 30 simplifies the structure of the Anpresssystems 1 further. The pressure system 1 can be completely sideways out of the roller 50 be pulled out, which is a simple change of the Anpresskissens 22 allows, but also simplifies maintenance.

A diameter of the front cylinder 16 is for example 40 mm. A diameter of the rear cylinder 18 is about 80 mm, so that a ratio of the piston surfaces of 1: 4 is achieved. As a result, about the same piston pressures are possible, for. B. 40 bar at 200 N / mm. The line force can thus be ensured with a single pressure. In this case, the internal costs of the internal pressure medium supply is minimal, at the same time very little control effort.

By the pressure system 1 Significant cost advantages result with improved technology. These advantages are mainly due to the internal pressure medium supply, the simple control options and the ease of installation and service.

In 3 is a section showing the arrangement of a restoring device 44 between the contact pressure element 2 and the base plate 25 shows. The reset device 44 has a spring 45 on that the pressing element 2 with the base plate 25 combines. Much of the spring 45 is in a cylindrical cavity 46 in the pressing element 2 added. But it is also conceivable, the return device 44 in conjunction with the actuators 29 . 30 that is, between the pistons 31 . 32 and the pressing element 2 to arrange. It has been found that it is sufficient, only about every second pressing element 2 with a reset device 44 to provide.

In this embodiment, only two pressing elements 2a . 2 B represented ( 1 ). With a width of about 125 mm per contact element 2 Of course, have more pressing elements 2 used to roll across the full width of a roll 50 to generate a high contact pressure.

4 shows a detailed view of the Anpresssystems 1 , There is a connection cable 47 axially free of force in the cavity 3 . 4 of the pressing element 2 connected. One end of the connecting cable 47 is play in the cavity 3 . 4 added. At this end of the connecting cable 47 is a trained as an O-ring sealing element 48 arranged, that prevents between the connecting line 47 and the pressing element 2 Pressure medium emerges. The other end of the connecting cable 47 is at a supply connection 49 connected to the carrier 26 is fixed.

The connection cable 47 is relatively flexible in the pressing direction, but relatively stiff in the axial direction. During a movement of the pressing element 2 Therefore, in addition to an elastic deformation of the connecting cable 47 also an axial relative movement between the connecting line 47 and the pressing element 2 , Unnecessary compulsion between the connection line 47 and the pressing element 2 is avoided.

In 5 a very similar alternative to the presented inventive solution is shown. The pillow 22 was from the contact shoe 28 laid on the inner wall. A disadvantage in this case is that the pad undergoes at least one compression with each revolution of the shell. Therefore, this embodiment is indeed possible in the sense of the invention but the already presented principle with a pillow 22 on the contact shoe 28 downstream of the meaning. The advantage here is only that the shoe can have a smooth metallic surface, which is adapted to the jacket geometry even before the installation of the Anpresssystems. Except for the difference of the displacement of the pillow 22 from the contact shoe 28 on the inner circumference of the jacket 27 remains the contact pressure system 1 but identical.

The roller according to the invention 50 characterized by high compressive stresses on one between the roller 50 and the counter element 35 to be treated web, in particular a paper web from. Nevertheless, the usual and elaborate hydrostatic lubrication of the Anpresssystems 1 in favor of a much simpler hydrodyna Mixing lubrication can be dispensed with.

1

Clamping System

2a, 2 B

pressers

3a, 3b

cavities

4a, 4b

cavities

5a, 5b

first front sides

6a, 6b

second front sides

7a, 7b

projections

8a, 8b

projections

9a 9b

recesses

10a, 10b

recesses

11

ring seal

12

ring seal

13a, 13b

axial recess

14

connecting element

15a, 15b

contact point

16a, 16b

front cylinder

17a, 17b

stubs

18a, 18b

rear cylinder

19a, 19b

stubs

20a, 20b

wells

21a, 21b

wells

22

Pressure Pads

23

head Start

24

head Start

25

baseplate

26

carrier

27

surrounding coat

28

pressure shoe

29

actuator

30

actuator

31

piston

32

piston

33

ring seal

34

ring seal

35

counter-element

36

nip

37

surface

38

slip sheet

39

front edge

40

arrow

41

guide element

42

second guide element

43

intermediate element

44

Reset device

45

feather

46

cavity

47

connecting cable

48

sealing element

49

supply terminal

50

roller

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 102007000662 [0007, 0012]

Claims (13)

Roll having a dimensionally stable, about an axis of rotation, dimensionally stable, a modulus of elasticity of at least 10,000 N / mm ^{2 in} both the circumferential and in the axial direction having jacket ( 27 ), the at least one contact shoe ( 28 ) in a pressing system ( 1 ), wherein the contact shoe ( 28 ) at least one pressing element ( 2 . 2a . 2 B ) and is radially displaceable to the axis of rotation, characterized in that the pressure shoe ( 28 ) an elastic pressure pad ( 22 ) and in the axial direction at least two pressing elements ( 2 . 2a . 2 B ) are arranged next to each other on a fixed support ( 26 ) are arranged movable independently of each other, wherein the carrier ( 26 ) extends parallel to the axis of rotation. Roller according to claim 1, characterized in that the jacket ( 27 ) consists of a steel or cast iron or a composite material of a matrix material, in particular epoxy resin, and reinforcing inserts of fibers, in particular aramid or glass fibers. Roller according to claim 1 or 2, characterized in that each pressing element ( 2 . 2a . 2 B ) via at least one actuator ( 29 . 30 ) with the carrier ( 26 ) is in contact. Roller according to one of claims 1 to 3, characterized in that each pressing element 2 . 2a . 2 B ) at least two actuators ( 29 . 30 ), which in the direction of rotation ( 40 ) of the jacket ( 27 ) are arranged one behind the other. Roll according to one of claims 1 to 4, characterized in that the pressing element ( 2 . 2a . 2 B ) at least one guide element ( 41 ), which is a movement of the contact shoe ( 28 ) in the direction of rotation ( 40 ) prevented. Roller according to one of claims 1 to 5, characterized in that the pressure pad ( 22 ) in the direction of rotation in the pressing element ( 2 . 2a . 2 B ) is held positively. Roller according to one of claims 1 to 6, characterized in that the pressure pad ( 22 ) has an E-module between 0.5 KN / mm ² and 4.5 KN / mm ² . Roller according to one of claims 1 to 7, characterized in that the pressing system ( 1 ) has at least one pressure line, which extends axially via the pressing elements ( 2 . 2a . 2 B ). Roller according to claim 8, characterized in that the pressure line as a cavity ( 3 . 4 ) in the pressing elements ( 2 . 2a . 2 B ) is formed, which extends from a first end face ( 5a . 5b ) to a second end face ( 6a . 6b ) of the pressing elements ( 2 . 2a . 2 B ). Roll according to one of claims 1 to 9, characterized in that the pressing system ( 1 ) a connecting element ( 14 ), which extends through an axial recess ( 13a . 13b ) in the pressing elements ( 2 . 2a . 2 B ). Roller according to one of claims 1 to 10, characterized in that between the Anpresskissen ( 22 ) and the pressing elements ( 2 . 2a . 2 B ) a continuous intermediate element ( 43 ) is arranged. Roll having a dimensionally stable, about an axis of rotation, dimensionally stable, a modulus of elasticity of at least 10,000 N / mm ^{2 in} both the circumferential and in the axial direction having jacket ( 27 ), the at least one contact shoe ( 28 ) in a pressing system ( 1 ), wherein the contact shoe ( 28 ) at least one pressing element ( 2 . 2a . 2 B ) and is radially displaceable to the axis of rotation, characterized in that the jacket ( 27 ) on the inner circumference of an elastic Anpresskissen ( 22 ) and in the axial direction at least two pressing elements ( 2 . 2a . 2 B ) are arranged next to each other on a fixed support ( 26 ) are arranged movable independently of each other, wherein the carrier ( 26 ) extends parallel to the axis of rotation. Roller according to claim 12, characterized in that the surface of the pressure shoe ( 28 ) is formed of metal.