DE102011079805A1 - Shoe roll, method of exchanging a sheath and elastic ring in a shoe roll - Google Patents

Abstract

The invention relates to a shoe roll for dewatering or smoothing a running fibrous web, in particular paper or board web within a machine for producing and / or finishing the fibrous web, with a fixed axis (2) on which at least one shoe (3) is supported, the acts against a flexible, exchangeable press cover (5), wherein the press cover (5) in its end regions (41) on frontally rotatable support disks (8) or associated components sealingly fastened against a resilient ring (10) radially pressed and in an exchange of the press jacket (5) is releasable again. In order to simplify the exchange process, it is provided that the elastic ring (10) and the jacket end region (41) can be connected by means of connecting elements (11) prior to fitting the jacket (5).

Description

The invention relates to a shoe roll for dewatering or smoothing a running fibrous web, in particular paper or board web within a machine for producing and / or finishing the fibrous web, with a fixed axis on which at least one shoe is supported against a flexible, exchangeable press cover acts, the press cover in its end regions on front-side rotatable support disks or associated components sealingly fastened, radially pressed against an elastic ring and in an exchange of the press jacket is releasable again.

Furthermore, the invention relates to a method for replacing a jacket on such a shoe roll.

Moreover, the invention relates to an elastic ring in such a shoe roll.

The coat of a shoe roll must be changed from time to time, for example because of wear. For this purpose, in the case of the rolls, the coat ends fastened to the support disks are released and the entire jacket is pulled off the axle. The reverse process of applying a replacement sheath will be described below with the term "mounting".

Frequently, a shoe roll cooperates with a mating roll and forms a so-called extended nip or also called a broad nip in which the fibrous web is treated under pressure. The shoe of the shoe roll has a jacket facing the pressure surface, which is not correspondingly convexly curved to the radius of the shoe roll. Rather, the shoe at this point often has a concave shape that is adapted to the radius of the backing roll.

As a result, the flexible sheath is bent during its circulation from the normally convex shape in the nip into a concave shape and is subject during operation of this constant alternating load. This has a very special influence on the end regions of the jacket, which are usually clamped in a circular manner on the end disks.

For the Breitnipwalzen, which are referred to by the applicant as NipcoFlex rollers, flexible coats made of polyurethane o. Ä. Materials are used. These are pulled on the edge of circular clamping discs and positively and tightly connected to these. In practice, the sheath edge is provided with perforated tabs which are fixed with screws on the clamping disc. In addition, the interior of the roller is placed under a slight overpressure (about 0.1 bar) in order to improve the concentricity. The coat is literally blown up. The lubrication between shoe and coat is usually done with oil. For this reason, the clamping must be sufficiently fluid-tight.

If the sheath is made of a harder material, such as Epoxy, metal, metal mesh, composite material, reinforced polyurethane or similar, the jacket must be connected via an elastic ring to the clamping disc, in order to reduce the bending stresses caused by the immersion of the backing roll in the Breitnipwalze. This elastic ring may for example be formed from an air-filled tube which is compressed in the region of immersion.

At this point, the disclosure of the EP 0 839 953 B1 in which an elastic ring is already presented, which allows radially compressing the jacket at the edge. As a result, the jacket is subjected to much less stress than if it had to assume a concave shape in the area of the shoe and a convex shape in the end areas.

Since the shoes are hydrodynamically or hydrostatically pressed against the jacket, the interior of the shoe roll must be completely sealed, so that no pressurized fluid can reach the fibrous web.

However, an installation and removal of the jacket in the previously used shoe rollers designed very difficult. Because it is to be considered that the coat does not want to assume its circular shape without support, but would collapse, and also can have a magnitude of over one meter in diameter and up to ten feet in length.

It is therefore an object of the invention to provide a shoe roll of the preamble, in which the mounting of a shell of epoxy, metal, metal mesh, composite material, reinforced polyurethane o. Ä. Is simplified. It is a further object of the invention to provide a method for replacing a shell, with which this is simplified.

The object is achieved with respect to the shoe roll in that the elastic ring and the shell end can be connected by means of connecting elements prior to mounting the shell.

In this way, the labor-easing possibility is created to lead the coat when mounting together with the elastic ring on the axis of the bearing support disks, which prevents mutual slipping. The so far pursued, possible by the constructions of the prior art approaches at Replacing a jacket is much more complicated and dangerous for the elastic ring. This can, if it is already mounted before the mounting of a shell on the support plate, easily destroyed, especially if a coat of a harder material, such as metal was chosen. By the common pulling on jacket and elastic ring, a build-up of leaks is prevented. The jacket can be deformed so far radially inward in the nip by the elasticity of the ring that he can follow the concave shape of Schuhandrückfläche. The connecting elements may be formed by mechanical components or by an adhesive.

It is advantageous if the connecting elements consist of the same material as the elastic ring. The elastic ring and the connecting elements are thus produced in the same operation, for example an injection molding process. There are no additional components as connecting elements.

The continued description is limited in terms of this connection of the connecting elements with the elastic ring. However, it should be expressly pointed out that should also be included by the invention to provide the connecting elements analogous to the jacket end.

The elastic ring preferably has nubs on its outer circumference which can be pressed into opposite jacket bores. Appropriately, these knobs are mushroom-shaped, so provided with undercuts. With such nubs, the pre-assembly of the elastic ring on the jacket is very easy to make. The mushroom head, which is slightly larger in diameter than the hole in the mantle, is compressed and spreads after passing through again. This ensures a secure hold.

It is advantageous if the elastic ring is formed from one or more polymer profiles. Such a generally flat profile is much easier to manufacture than a ring. In addition, the mounting on the roll shell is considerably simplified.

It is particularly advantageous if the ends of the polymer profile are formed like a comb. An impact formed by two ends of the polymer profile thereby shows overlaps in the axial roll direction, which serves for better sealability. The contiguous ends of the polymer profile engage each other like puzzle pieces and close the parting line.

Preferably, the elastic ring has a plurality of rows of connecting elements in the circumferential direction, wherein the connecting elements of the individual rows are arranged offset from one another on the circumference. This simplifies a manufacturing process, for example when removing a polymer profile with nubs from an injection mold. In addition, the investment of the polymer profile is improved on the inner circumference of the Walzenendbereichs.

It is advantageously ensured that the elastic ring has bores through which torque sensors and / or axial thrust sensors can be plugged. This ensures that the tensile and torsional stresses in the jacket can be dissipated via the support disks. In the simplest case, the torque transducers and / or axial thrust transducers can be screws which extend through an outer cover into the support disk or components connected thereto. For a simple attachment of the jacket is possible.

Radial pressure limiters are preferably provided for an optionally segmented and screw-on outer cover. With the Radialdruckbegrenzern a compression of the elastic ring is limited and thus prevents overloading of the material.

It is advantageous if in the radial direction further below the elastic ring two components with complementary conical surfaces lie on one another, of which at least one is axially displaceable. In general, these components will be two rings, but it should not be excluded from the invention conically shaped jaws. By axial displacement of one of these rings is obtained with the other complementary counterpart a radial clearance below the elastic ring, so that it is once again easier to bring the jacket together with the elastic ring on the support plate.

In order not to have to segment both components on the circumference, it is particularly advantageous if one of the components consists of a material with an elastic extensibility of at least 3%. 3% extensibility creates a radial contraction of about 30 mm over a diameter of one meter. This value guarantees easy mounting of the jacket with elastic ring. In addition, such a ring is always fluid-tight against the conical counterpart on its entire circumference.

The object with regard to the simplifying exchange method of a jacket is achieved in that an elastic ring is attached by means of connecting elements to the jacket in the jacket end region before the jacket end region is sealingly fastened to face-side rotatable support disks or components connected thereto.

Preferably, the elastic ring is attached to the Mantelendbereich by nubs, which are connected to the elastic ring, are pressed into corresponding jacket holes in the Mantelendbereich. The connection is particularly easy to manufacture and prevents slippage of the jacket and elastic ring when mounting the jacket.

The object is achieved with an elastic ring in such a way that it is provided with connecting elements which are connectable with the Mantelendbereichen before a jack lift. Such a ring is, as already described, usefully used when mounting a jacket.

Advantageously, the connecting elements are knobs made of the same material as the elastic ring. This means that the ring can be produced as an injection-molded part.

Preferably, the ring is molded from a polymer profile. A flat profile is even easier to produce. Because of its elasticity, it can be easily formed into a ring that can be attached via its fasteners at the shell end.

The invention is explained in more detail below with reference to exemplary embodiments with reference to the drawings. In this shows

1 a section of the longitudinal section through a shoe roll according to the invention

2 an increase in the clamping range of the shell 1 in longitudinal section

3 an alternative embodiment of the clamping portion of the shell in longitudinal section

4 a three-dimensional representation of a polymer profile from which the elastic ring of the invention is formed and

5 a cross-section through a shoe roll of the prior art for explanation

With 5 is an urgent and underlying problem explained with reference to a sketch of a shoe roll of the prior art, which was considered in achieving the object of the invention. In the drawing is a shoe roll 1 shown in cross-section, which interacts with a counter-roller and a nip 30 forms, in which a fibrous web, not shown, can be treated. The shoe roll 1 has a circumferential coat 5 (Running direction L), at its ends to support disks 8th is attached. The surrounding coat 5 thus describes at its ends a nearly circular path and has the shell shape A (dashed line). Through the shoe roller pulls an axle 2 , on which by means of at least one hydraulic support element 4 at least one shoe 3 supports and against the coat 5 in the direction of counter roll 28 can be pressed. To reduce friction, the pressure surface 29 of the shoe 5 lubricated with oil against which the shoe roll 1 must be sealed. The pressure surface 29 of the shoe 3 is concave and the counter roll 28 customized. This will make a wider nip 30 generated by at least 30 mm in the circumferential direction. That means for the coat 5 however, that it is subjected to constant alternating loads in the area of the counter-roller and assumes the form B, while it remains round in the edge area (A). The different tracks A and B are in the 5 exaggerated to better illustrate it. In fact, the height difference moves between the low point in the concave pressure surface 29 and the circular path A in the millimeter range or even lower. However, the resulting increased stresses are not negligible and the more problematic the stiffer the jacket 5 is. So you had to watch, as in the EP 0 839 953 B1 To use an elastic ring, which allows the concave shape of the jacket, which he experiences on the shoe, even to the end of the jacket 5 to be able to continue. In such a roll, however, the mounting and sealing of the shell is difficult.

This problem is solved by the shoe roller, as in 1 is shown. Since the essential features of the invention are difficult to recognize there, the (alternative) details of Manteleinspannung 40 in the description to the 2 to 4 explained. In 1 is the coat 5 to recognize the means of the bearing assembly 31 rotatable about the fixed axis 2 is supported. On a bearing inner ring, which encloses the axle, has the bearing assembly 31 its seat. This is outward by a known seal arrangement 32 sealed, so that no lubricating fluid from the roller and storage can escape. On an outer bearing ring 35 is the support disk 8th attached. The support disk 8th includes at its end the Manteleinspannung 40 , For a better understanding of the structure are on the right side still a piece of the shoe 5 and also known from other shoe rollers hydraulic support elements 4 in the form of a piston-cylinder unit 34 shown, with which the pressure profile over the web width in the nip 30 can be adjusted.

In 2 is the jacket clamping 40 shown in more detail. It is the floating bearing side of a Manteleinspannung 40 with a polymer profile 9 to see. The polymer profile is a ring 10 shaped and over fasteners 11 with the coat 5 in the sheath end area 41 connected. In this special design are two circumferential rows 13.1 and 13.2 with pimples 12 integral with the polymer profile 9 connected. In between, the polymer profile has that to the elastic ring 10 Shaped, a series of holes 14 by which a torque and / or Axialschubaufnehmer 18 , here simply in the form of screws 25 , can be plugged.

Fits the pimples rows 13.1 and 13.2 and the holes 14 in the elastic ring 10 is the coat 5 perforated in three rows in the marginal areas over the entire circumference, the two outer rows of holes receiving the nubs 12 serve. These have a mushroom-shaped shape with a knobbed head 15 and a dimple undercut 16 which is much better in 4 can be seen. Through the middle row of holes are the torque and / or Axialschubaufnehmer 18 assembled. The screws 25 , each having a torque and / or Axialschubaufnehmer 18 form, are also the fastener for the outer lid 7 , which is preferably designed in several parts.

The elastic ring 10 must be placed in operation so that it can be pushed in as far as the concave shape of the shoe dictates. Therefore, a radial stroke limiter 19 provided, in the embodiment in the form of a socket, the screw 25 So a torque and / or Axialschubaufnehmer 18 surrounds. This will prevent the outer cover 7 the elastic ring 10 already over the coat 5 compressed too much. The radial stroke limiter 19 sits in cylindrical countersinks, which are at the periphery of the support ring 38 are introduced. When tightening the cylinder screws 25 become the mushroom-shaped pimples 12 the polymer profiles 9 through the segmented outer cover 7 biased. This is where the Radialhubbegrenzer 19 in cylindrical countersinks on the inside of the outer cover 7 at. As a result, the clamping path and thus the radial bias are limited while ensuring that it is the same everywhere. In addition, take the Radialhubbegrenzer 19 the axial force resulting from the jacket bias and transfer it to the torque and / or Axialschubaufnehmer 18 ,

The outer ring 37 that with screws 26 on the support disc 8th screwed on, secures the support ring 38 axially. On the loose bearing side of the shoe roll is a game 39 provided so that the coat 5 can expand. This is particularly important when the jacket is made of metal, for example, and with a hot backing roll 28 the nip 30 forms.

While between jacket and support ring 38 the elastic ring 10 at the same time acts as a sealing element is radially further inside between support ring 38 and the support disk 8th a sealing ring 33 intended.

3 shows an alternative, once again improved embodiment of the Manteleinspannung 40 , Instead of a hard support ring 38 on which the elastic ring 10 Resting during operation is a first component 20 provided in the form of an already expanded stretchable ring. The first component 20 is conical in shape and has a conical surface 22 , On it lies, also with a conical surface 23 a second component 21 on, in a manner not shown with the outer ring 37 screwed and thus connected to the support plate. If this screw is loosened, the second component is moved axially and moves - looking at the figure - to the right. As a result, the expanded first component 20 that can stretch elastically by at least 3% contracting its diameter by relaxing it again. The material used in this embodiment is PEEK (polyetheretherketone), which can be stretched elastically by more than 5%.

Once the outer cover has been dismantled, the torque and / or Axialschubaufnehmer can be removed after pulling out 18 the coat 5 together with the elastic ring 10 pull off easily. The inclusion of the axial force takes place in this variant by a large number on the circumference of the first component 20 arranged cylindrical pins. These are provided by the outside cover 7 secured radially. Equally simple is the reverse process of rewinding a jacket 5 ,

For this purpose, first a polymer profile 9 as it is in 4 shown with his pimples 12 in holes 6 in the sheath end area 41 pressed. It can also be several short profiles in the circumferential direction one behind the other. The knobs are arranged, for example, in two rows, 13.1 and 13.2 , and offset, so that the polymer profile can be easily produced by injection molding (removal of mold). Between the rows of pimples there are a number of holes 14 through which later the torque and / or Axialschubaufnehmer 18 to grab. The pimples have a head 15 like a mushroom-headed stalk 16 rests and is slightly larger in diameter than a hole 6 in the coat 5 , After putting on the coat 5 over the support disks 8th be by placing the outer cover 7 or by tightening the second component 21 the knobheads 15 between outer cover 7 and coat 5 squeezed and sealed the hole 6 from.

The polymer tape 9 , which is annularly bent and "clipped" to the shell end on the inner circumference, has a comb-shaped end 17 , This comes it in the impact to overlaps, which ensure a good seal in the shoe roll. The "tines" of the comb almost interlock. Of course, other forms are conceivable here.

From the illustrated embodiments may be deviated in many ways at all, without departing from the spirit of the invention. In particular, other fasteners 11 as pimples 12 be considered. Also, no number of fastener rows 13.1 . 13.2 be prescribed. The connecting elements 11 can before connecting elastic ring 10 and coat 5 be attached to both of these parts. It is only important for the invention that a simple detachable connection possibility of sheath 5 and elastic ring 10 is provided, which is used prior to installation of the jacket.

LIST OF REFERENCE NUMBERS

1

 shoe roll

2

 axis

3

 shoe

4

 Hydraulic support element

5

 press cover

6

 jacket bore

7

 outer cover

8th

 supporting discs

9

 polymer profile

10

 Elastic ring

11

 connecting element

12

 burl

13.1, 13.2

 Connecting element row

14

 Hole in the elastic ring

15

 knob-head

16

 Noppenhinterschneidung

17

 Comb-shaped end

18

 Torque and / or Axialschubaufnehmer

19

 Radialdruckbegrenzer

20

 Component 1

21

 Component 2

22

 Conical surface 1

23

 Conical surface 2

24

 camp

25

 screw

26

 screw

27

 screw

28

 backing roll

29

 Concave pressure surface

30

 nip

31

 bearing arrangement

32

 sealing arrangement

33

 sealing ring

34

 Piston-cylinder unit

35

 bearing ring

36

 Bearing inner ring

37

 outer ring

38

 support ring

39

 end play

40

 Manteleinspannung

41

 Mantelendbereich

L

 direction

A

 Sheath shape at the shell end

B

 Sheath shape in the shoe area

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 0839953 B1 [0009, 0036]

Claims (15)

Shoe roll for dewatering or smoothing a running fibrous web, in particular a paper or board web within a machine for producing and / or refining the fibrous web, with a fixed axis ( 2 ), on which at least one shoe ( 3 ) supported against a flexible, exchangeable press cover ( 5 ), wherein the press cover ( 5 ) in its end regions ( 41 ) on front-side rotatable support disks ( 8th ) or associated components sealingly fastened against an elastic ring ( 10 ) radially compressible and in an exchange of the press jacket ( 5 ) is detachable, characterized in that the elastic ring ( 10 ) and the jacket end region ( 41 ) by means of connecting elements ( 11 ) before putting on the jacket ( 5 ) are connectable. Shoe roll according to claim 1, characterized in that the connecting elements ( 11 ) made of the same material as the elastic ring ( 10 ) consist. Shoe roll according to one of claims 1 or 2, characterized in that the elastic ring ( 10 ) at its outer periphery pimples ( 12 ), which are located in opposite sheath bores ( 6 ) are embossable possesses. Shoe roll according to one of claims 1 to 3, characterized in that the elastic ring ( 10 ) from one or more polymer profiles ( 9 ) is shaped. Shoe roll according to claim 4, characterized in that the ends ( 17 ) of the polymer profile ( 9 ) are formed comb-like. Shoe roll according to one of claims 1 to 5, characterized in that the elastic ring ( 10 ) several rows of connecting elements ( 13.1 . 13.2 ) in the circumferential direction, wherein the connecting elements ( 11 ) of the individual rows on the circumference are arranged offset to one another. Shoe roll according to one of claims 1 to 6, characterized in that the elastic ring ( 10 ) Drilling ( 14 ), by the torque transducer and / or Axialschubaufnehmer ( 18 ) are pluggable. Shoe roll according to one of claims 1 to 7, characterized in that for an optionally segmented and screw-on outer cover ( 7 ) Radial pressure limiter ( 19 ) are provided. Shoe roll according to one of claims 1 to 8, characterized in that in the radial direction further inwardly below the elastic ring ( 10 ) two components ( 20 . 21 ) with complementary conical surfaces ( 22 . 23 ) are superposed, of which at least one is axially displaceable. Shoe roll according to claim 9, characterized in that one of the components ( 20 . 21 ) consists of a material with an elastic extensibility of at least 3%. Method for replacing a shell ( 5 ) on a shoe roll ( 1 ) according to one of the preceding claims, characterized in that on the jacket ( 5 ) in the jacket end region ( 41 ) an elastic ring ( 10 ) by means of connecting elements ( 11 ) is applied before the jacket end region ( 41 ) on front-side rotatable support disks ( 8th ) or associated components is sealingly secured. Method according to claim 11, characterized in that the elastic ring ( 10 ) at the jacket end region ( 41 ) is attached by nubs ( 12 ) with the elastic ring ( 10 ), in corresponding casing bores ( 6 ) in the jacket end region ( 41 ). Elastic ring for a shoe roll according to claims 1 to 10, characterized in that it is provided with connecting elements ( 11 ) provided in front of a jacket lift with the jacket end regions ( 41 ) are connectable. Elastic ring according to claim 13, characterized in that the connecting elements ( 11 ) Pimples ( 12 ), which are made of the same material as the elastic ring. Elastic ring according to claim 13 or 14, characterized in that the ring is formed from a polymer profile.

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