WO2014075791A1

WO2014075791A1 - Suction roll system

Info

Publication number: WO2014075791A1
Application number: PCT/EP2013/003405
Authority: WO
Inventors: Andreas Rinke; Rolf MAJEWESKI; Konrad Popp; Thorsten Tews; Reiner Seger; Jürgen VIEWEG
Original assignee: Winkler + Dünnebier Gmbh
Priority date: 2012-11-13
Filing date: 2013-11-12
Publication date: 2014-05-22
Also published as: CN104812539A; PL2919951T3; TW201433674A; PT2919951T; CN104812539B; EP2919951B1; RS56716B1; EP2919951A1; KR102163409B1; ES2654308T3; DE102012022120A1; KR20150086296A; TWI553189B; HUE035742T2

Abstract

A suction roll system (1) with a rotatably mounted cylindrical suction roll (32), the cylinder jacket (34) of which is provided with a plurality of suction holes (36), which can be selectively connected via a control system individually or in groups to a vacuum system (14), is intended to make possible, in a reliable fashion, particularly short switchover times and also high flexibility, even when groups of a plurality of suction holes (36) are actuated. To this end, according to the invention, the control system comprises a fixedly mounted hollow cylinder (2) projecting into the suction roll (32) and connected by its interior volume (10) to the vacuum system (14), the cylinder jacket (20) of which is penetrated by a number of control slots (22).

Description

description

suction roller

The invention relates to a Saugwalzensystem with a rotatably mounted cylindrical suction roll, the cylinder jacket is provided with a number of particular forming a perforation Sauglöchem which are individually or groupwise selectively connected to a vacuum system via a control system. It further relates to a plant for processing an aterialbahn, in particular a paper or pulp web.

In the paper or pulp processing industry, material webs are often processed. In this case, for example, in the production of envelopes, printed products or the like, paper webs are fed to a further processing, individual pieces of material being cut, folded, printed or otherwise processed from the paper webs. Similarly, for example, in the production of handkerchiefs, a pulp fiber web is subjected to further processing steps, wherein handkerchiefs or other hygiene articles are cut from the pulp fiber web to the desired size and the resulting pieces of material are then suitably folded and, for example, packaged.

During the processing of these material webs or of the flat material pieces cut out of these or separated, the material is usually guided in the plant provided for processing via a multiplicity of transport or processing devices. In this context, often functional rollers are used, over which the material webs or pieces of material guided and thereby deflected or possibly only supported. If required, such functional rollers can be provided with cutting devices, embossing devices or the like, in order to be able to process them as required during the course of the respective material via the roller

CONFIRMATION COPY to make the material. Such a functional roll or functional roll can be embodied as a so-called suction roll system, with which the material draining off the roll is sucked as needed onto the functional roll or functional roll, so that a good adhesion of the material guided over the roll or roll can be ensured.

Such Saugwalzensystem, as for example from the

DE 10 2009 033 575 A1 discloses usually comprises a rotatably mounted cylindrical suction roll whose cylinder jacket is provided with a number of suction holes or suction slots forming a perforation pattern, which can be selectively connected to a negative pressure system individually or in groups via a control system. By means of a suitable control, individual suction holes or selected groups of suction holes are purposefully connected to the vacuum system, so that in the region of the respectively controlled suction hole, the material piece is sucked onto the suction roll and held thereon.

To control the suction holes are usually via a system of suction channels, which are guided within the roller body in the longitudinal direction and branch off at the location of the respective suction hole radially outward and open into the respective suction hole, connected to the end face of the roller body. Corresponding to this end face while a so-called control head is arranged in the holding frame of the suction roll, which has a number of control openings, which in turn are connected to a vacuum system. During a rotation of the suction roll, an overlap of the frontal outlet of the respective suction channel with a control opening in the control head may then occur, so that in this case the corresponding suction hole is connected to the vacuum system. As a result, during a rotation of the suction roll, the negative pressure at the respective suction hole can be switched on and off again as required, so that it is possible to act on the respective suction hole under vacuum with exact timing. In such systems, however, the suction passages connecting the suction holes to the control head on the vacuum side usually have a comparatively unfavorable length-cross-section ratio, so that the gas exchange in the respective suction channel is subject to a comparatively high flow resistance when switching between negative pressure mode and normal pressure mode. The switching times achievable with such a system are therefore only limited, as are the degrees of freedom in the group-wise common or simultaneous activation of a plurality of suction holes.

The invention is therefore based on the object of specifying a Saugwalzensystem of the above type, with the reliable way particularly short switching times and also a high degree of flexibility in the group-wise control of a plurality of suction holes can be achieved.

This object is achieved in accordance with the invention for the selective connection of individual or more suction holes or suction slots provided with the vacuum system control system includes a fixed mounted, connected with its interior to the vacuum system, projecting into the suction roll hollow cylinder, the cylinder shell of a number of control slots is.

The invention is based on the consideration that the switching times achievable in the control of the suction holes or suction slots and thus the possible process speeds in the overall system depend to a considerable extent on the channel geometry in the connection of the suction holes with the vacuum system. In particular, for short switching and control times, the aim should be to keep the connection channels as short as possible and the channel cross sections as far as possible. For this purpose, it is provided to consistently position the space area (in the case of previous systems, the control head in the support frame of the suction roll) as close as possible to the area of the suction holes so that the connection channels between the suction hole and the permanent vacuum can be kept particularly short. In order to make this possible, a hollow cylinder projecting into the suction roll is provided, the interior of which is to be permanently exposed to negative pressure during the operation of the plant. For the "switching" of the suction holes, only a pressure-side connection between the vacuum chamber, ie the interior of the hollow cylinder, and the respective suction hole is then produced, the drive channels required for this only need to penetrate the cylinder jacket of the hollow cylinder; On the other hand, in order to enable the suction holes, that is to say their vacuum-side connection with the interior of the hollow cylinder, to be actuated, the hollow cylinder has a number of control slots in its cylinder jacket, a control, ie a connection on the underpressure side the respective suction hole with the vacuum chamber, is given when the respective suction hole sweeps over one of the control slots as a result of the rotation of the suction roller.

The or each suction hole may have a round opening cross section, so that it is substantially similar to a conventional bore. Alternatively, such a suction hole - for example, depending on its position on the cylinder jacket and desired in the operational use suction profile - but also with a differently shaped active suction, for example in the manner of a suction slot or the like, be designed. The term "suction hole" is intended to expressly include such modified geometries.

Advantageously, the control slots each extend in the circumferential direction of the cylinder jacket. Due to the position of the respective control slot, so in particular its start and end point and its length in the circumferential direction, thus the desired timing for the respective suction hole can be preset properly. In particular, the appropriate positioning of a plurality of such control slots, which are mutually independent of each other in terms of their starting and / or end points, The specification of a control pattern for the totality of the suction holes possible, so that a particularly suitable for the respective plant process control pattern of the suction holes on the appropriate attachment of suitable control slots in the cylinder wall of the hollow cylinder is possible. A group-wise control of a plurality of suction holes is possible, for example, by a suitable width selection of the respective control slot, which can be particularly dimensioned in width such that several seen in the longitudinal direction of the suction roller successively lying suction holes cover the respective control slot together.

A particularly high flexibility in the group-wise control of a plurality of suction holes can be achieved, in which in a particularly advantageous embodiment, the suction roller in the region of its cylinder jacket is designed for a channel guide in the manner of distribution channels for the negative pressure. For this purpose, a further, designed as an independent component distribution element may be provided, or the cylinder jacket of the suction roll may be made sufficiently thick and solid to form such a distribution element itself. The distributor element formed by these variants is preferably designed such that it can connect the control slots on the negative pressure side in each case with a suitably selected plurality of suction holes. For this purpose, advantageously, the suction roll on the inside to form this distributor element comprises a with its around the hollow cylinder rotatably mounted distributor shell, which is interrupted by a number of distribution channels. By the leadership of these distribution channels, the respective distribution channel outlet side associated suction holes can be assigned to the respective selected control slots according to individual specifications, in particular also suction holes, which are seen in the longitudinal direction of the roller spaced from the respective control slot positioned via a suitable channel guide with each control slot in combination can be brought. In this way, by the appropriate channel guide even with a predetermined pattern of the control slots in the cylinder jacket of the hollow cylinder a comparatively complex, individually to the respective plant process and the The resulting activation requirement of the suction holes adapted control pattern achievable.

In a particularly advantageous development, this design can be used to realize a group-wise control of the suction holes, in particular seen in the longitudinal direction of the suction roll. For this purpose, it is expediently provided that at least some of the distribution channels have a cross-section widening from the inside to the outside. In particular, the or each distributor channel expediently has on the outside of the distributor casing a cross section extending in the longitudinal direction of the suction roll so that via this distributor channel a plurality of suction holes arranged one behind the other in the longitudinal direction of the suction roll can be connected to one and the same distributor channel. On the inside, the respective distributor channel can be designed with a comparatively narrow cross-section, for example in the form of a bore. In this embodiment, in a rotation of the suction roll around the hollow cylinder around the inside bore of the respective distribution channel sweeps over the control slot associated with the hollow cylinder, thus all suction holes connected to the outside of the distribution channel are simultaneously and synchronously pressurized with negative pressure.

In a particularly preferred embodiment, the Saugwalzensystem is designed for a particularly facilitated change of the respective components. For this purpose, the hollow cylinder protruding into the suction roll is advantageously connected fixedly to a support structure only at one of its end faces, in particular its assembly end. The other end of the hollow cylinder, which is expediently pressure-tightly closed with a suitable cover on the front side, is advantageously firmly mounted on the forwardly projecting drive flange of a drive unit. In this preferred embodiment, the suction roll and, if appropriate, the distribution jacket arranged in this on the inside are pushed forward onto the shaft of the drive flange (in particular of the motor flange) and substantially completely mounted thereon. If required, additional storage may be provided via a at the end of the mounting of the hollow cylinder. ders arranged storage system may be provided. By such "flying storage" of the suction roll replacement of the components, for example, for maintenance or repair work or to adapt to adapt to the needs of the plant process a suction roll with a modified Perforationsmuster the suction holes to attach in a particularly simple manner possible by Optionally, the connection of the interior of the hollow cylinder to the vacuum system may also be provided via a connection system arranged at the end of the assembly.

The suction holes may be arranged in their entirety in the manner of a perforation pattern in the cylinder jacket of the suction roll. In a particularly advantageous embodiment, which is otherwise considered to be inventive in its own right, the cylinder shell of the suction roll is designed in the manner of a multi-part design, in which individual partial surfaces of the cylinder jacket are designed as separate, removable components, each carrying a number of suction holes. In this particularly preferred embodiment, the cylinder jacket of the suction roll thus has a number of sheath strips which are detachably connected to the actual or "inner" suction roll body and each provided with a number of suction holes For example, a cladding strip can be designed as a so-called squeegee, which is essentially provided with suction holes and in the processing of pulp cloth products the respective beginning of section of the Alternatively, a shroud can also be designed as a so-called folding strip, which has a combination of suction holes and suction slots and fulfills the function that the cloth section when turning o hold the wrinkles, so that here after turning the new front edge of the cloth section forms. As a result of this embodiment, it is necessary to replace only this component, which is made in the manner of a diaphragm, for example by means of a screw connection, for adaptation or modification of the perforation pattern formed by the suction holes on the surface of the cylinder jacket. The other components of the suction roll, in particular the vacuum system with the distributor casing and the actual base or inner body of the suction roll, however, can be maintained unchanged. An adaptation of the suction or perforation pattern is thus possible in a particularly simple manner.

In a further, likewise particularly preferred embodiment, the suction roll system is designed specifically for a particularly needs-based treatment of paper or tissue webs with comparatively low demands on the required negative pressure. In this preferred embodiment, all but at least some of the suction holes in the cylinder jacket of the suction roll are made with a cross-section widening from the inner surface of the cylinder jacket to the outer surface of the cylinder jacket. Still further preferred and inherently inventive in itself is an embodiment of the suction roll system in which one or some of the suction holes have at their outer end a cross-sectional contour in which a suction surface at least partially encloses an approximately positioned in the outer surface of the cylinder shell of the suction roll support surface ,

This is based on the finding that it is desirable for process-technical reasons, the negative pressure required for the process control, so the amount of deviation from normal pressure to keep comparatively low, since in this way the requirements for sealing systems and the like are kept relatively low can. The gas exchange processes can thus be reliably represented in terms of equipment with relatively little effort and yet with short switching and reaction times. However, in order to still allow reliable process control with a comparatively low vacuum level, in particular at the suction roller on the vacuum system for holding the paper or web required holding forces are reliably applied, the effective suction surface of the respective suction hole, so the passage area through which the negative pressure on the surface of the suction roll is applied to the web should be sized sufficiently large.

On the other hand, however, it should be taken into account that deformations in the material web may occur if the effective suction surface is dimensioned too large, in particular if the material is comparatively soft. Such deformations can lead to leaks in the suction of the material, which could seriously affect the process control. To counteract this, the roll surface in the respective suction region should be designed such that suction regions (ie, portions of the effective suction surface of the respective suction hole) are positioned immediately adjacent to support regions in which the material web is suitably stabilized and fixed. For this purpose, a support surface provided for supporting the material is positioned in the immediate vicinity of the respective suction surface, on which the material can rest suitable for avoiding deformations such as wrinkling. Advantageously, the suction roll system is used in a plant for processing material web, in particular a paper or pulp web. In such a plant in the material or pulp web is guided over a number of functional roles or function rollers, thus, preferably, the or each of these functional roles listed as a suction roll of the type mentioned.

In particular, the suction roll system can be used in the context of the processing of strip-like, prefolded cloth sections of hygiene products. These are received by a formed by the suction roll, cantilevered drum, in which due to the above-described embodiment of the Saugwalzensystems the vacuum and the ventilation are fed to the suction holes in the radial direction. The cloth sections are folded in the system one or more times transversely to their direction of movement and delivered for further processing. The individual product section is included preferably held by a plurality of rows of suction holes on the circumference of the drum or suction roll, which are arranged transversely to the direction of the product portion on the drum or roller.

The advantages achieved by the invention are in particular that by design of the control system as projecting into the suction roll hollow cylinder, the switching paths, are connected via the suction holes in the control with the vacuum system, can be kept particularly short. This makes particularly short control times and correspondingly high process speeds with high reliability achievable. Due to the particularly preferred interposition of the distributor sheath, a flexible and precisely synchronous control of a plurality of suction holes can only take place when the channel lengths are kept short. An example of a process-related desired change of the drive pattern is achievable, in which only an exchange of the distributor jacket in view of the guidance of the distribution channels is required therein.

An embodiment of the invention will be explained in more detail with reference to a drawing. Show:

FIG. 1 a suction roller system in exploded view,

FIG. 2 the Saugwalzensystem according to FIG. 1 in assembled state in

Longitudinal section

FIG. 3 shows a folding strip for the suction roller system according to FIG. 1, and

FIG. 4 shows the folding strip according to FIG. 3 in front view.

Identical parts are provided with the same reference numerals in all figures. The Saugwalzensystem according to FIG. 1 is intended for use in a non-illustrated plant for processing a paper or pulp web. In this plant, the paper or pulp web is first in its entirety on functional roles, such as pulleys, but also cutting or separating rollers, out. Depending on the intended use of the system, the material web is thereby cut into a plurality of individual pieces of flat material, for example pieces of paper or pieces of pulp such as handkerchiefs or the like, with the pieces of material then being individually transported further or fed to further processing. Also during the further transport of the individual pieces of material, a deflection, a support or a processing, for example in the form of further cutting operations, punching of windows, application of imprints or the like may be provided.

The suction roller system 1, which can be used at any point within the system as a respective functional roller or functional roller, is designed specifically for a reliable and highly accurate control of individual suction holes, with which the material web or the respective piece of material can be temporarily held on the outside of the roller designed , For this purpose, the suction-roll system comprises a hollow cylinder 2, which is fixedly connected to a support structure (not shown) at one of its ends 4, hereinafter referred to as "mounting end" 6. A drive motor 8 and a support flange 9 are mounted on the latter, onto which the hollow cylinder 2 can be slid in. The interior 10 of the hollow cylinder 2 is connected to a vacuum system 14 symbolized by a vacuum pump 12 via a feedthrough 11 provided on the assembly end 6.

At its free end 16, the hollow cylinder 2 is pressure-tightly sealed by a cover 18, which may be designed as an independent component or may also be part of the casting body forming the hollow cylinder 2. The cylinder jacket 20 of the hollow cylinder 2 is interrupted by a number of control slots 22, via which the interior 10 of the hollow cylinder 2 is on the pressure side with its outer space in communication. The control slots 22 in this case have a direction of the hollow cylinder 2 and the cylinder jacket 20 extending extension.

As further components, the suction roll system comprises a distributor jacket 30, which is arranged within a cylindrical suction roll 32. The distributor shell 30 could be designed as an independent, inserted into the suction roll 32 and there suitably fastened component. In the exemplary embodiment, the distributor jacket 30 is formed by the actual, suitably thickened and solid cylinder jacket 34 of the suction roll 32.

The cylinder jacket 34 of the suction roll 32 is provided on its outer surface with a total of a perforation forming suction holes 36 through which the resting on the surface of the cylinder jacket 34 material can be sucked as needed. The suction roller 32 is closed at the end with a lid 38. Incidentally, the cylinder jacket 34 of the suction roll 32 is designed in several parts, wherein on its surface individual partial surfaces are designed as separate, removable components forming shell strips 40, each carrying a number of suction holes 36. The shell strips 40 are detachably connected via a respective suitable screw with the actual or "inner" Saugwalzenkörper forming cylinder jacket 34 and inserted for local positioning and lateral fixation in suitable grooves in the cylinder jacket 34.

The sheath strips 40 thereby form suitably adjusted suction patterns by suitable positioning and / or dimensioning and / or geometry selection of their respective suction holes 36 or suction slots, which are adapted to the respective processes and requirements of the plant process. For example, a shell strip 40 can be embodied as a so-called suction strip, which is essentially provided with suction bores and, during the processing of pulp cloth products, holds the respective section beginning of the cloth section. Alternatively, a shell strip 40 but also be designed as a so-called folding strip, which has a combination of suction holes and suction slots and the Function is fulfilled, which hold the cloth section during folding or folding, so that here forms after folding the new front edge of the cloth section.

As indicated by the arrow 42, the suction roller 32 is pushed during assembly of the suction roller system on the hollow cylinder 2, so that in the assembled state of the Saugwalzensystems the hollow cylinder 2 projects into the suction roller 32 inside. At the end, the suction roll 32 is fastened at the assembly end 6 to a contact surface 43 driven by the drive motor 8. During operation of the suction roller system 1, this contact surface 43 is set in rotation about the longitudinal axis of the suction roller system, so that with this, the suction roller 32 rotates correspondingly about its longitudinal axis. To support the suction roll 32 is mounted on a turn mounted on the hollow cylinder 2 sliding bearing ring 44. This realizes a substantially "flying bearing" of the suction roll 32, in which the essential bearing forces are absorbed by the end mounted slide bearing ring 44. For additional guidance and as needed stabilization, a guide pin 45 can still be arranged at the free end of the carrier shaft 9 a corresponding inside centrally in the lid 38 mounted, not shown in the figure recess engages.

The distribution jacket 30 integrated in the cylinder jacket 34 of the suction roll 32 is pierced by a number of distribution channels 46. On the output side, that is to say to the area of the outer surface of the cylinder jacket 34, each distributor channel 46 opens below a respective associated folding strip 40 and is thus associated with the suction bores 36 arranged in the respective folding strip 40. Each distribution channel 46 thus provides in the mounted state, a gas or pressure side connection between the respective associated suction bores 36 of the suction roll 32 on the one hand and the interior of the cylinder jacket 34 on the other hand.

In the mounted state of the suction roller system, that is, when the suction roller 32 provided on the inside with the distributor casing 30 is pushed onto the hollow cylinder 2, the suction holes 36 of the suction roller 32 are actuated, that is a pressure-side connection of the respective suction hole 36 with the vacuum system 14, then, as a result of the rotation of the suction roll 32 and arranged in this distributor sheath 30 around the hollow cylinder 2 around the inside opening of a distribution channel 46 one of the control slots 22 sweeps. In this case, a pressure-side connection between the inner space 10 of the hollow cylinder 2 and the suction holes 36 connected on the outside to the respective distribution channel 46 is produced.

As the representation of the Saugwalzensystems in the assembled state in the longitudinal section of FIG. 2, the distribution channels 46 each have a cross-section which widens from the inside to the outside, the distribution channels 46 on the outside of the distributor jacket 30 having a cross section extending in the longitudinal direction of the suction roll 32. The distribution channels 46 are dimensioned and dimensioned such that they are connected in the longitudinal direction - depending on the intended purpose - with one or more of the suction holes 36.

The Saugwalzensystem thus forms a floating drum system, in which due to the above-described embodiment of the distribution channels 46, the vacuum and the ventilation is supplied to the suction holes 36 relative to the suction roller 32 in the radial direction. The individual rows of suction bores 36 for a product section, which extend across its width, are supplied by means of the distribution channels 46 via a channel system which is located below the product plane formed by the actual outer surface of the suction roll 32 in the distributor casing 30. Conceptually, the outside surface 50 of the distributor jacket 30 thus forms a second level of the channel guide. This communicates on the vacuum or ventilation side via the distributor channels 46 with the inlet openings 52 arranged in the latter on the inside, which are placed in the manner of a third plane on the inside surface 54 of the distributor jacket 30. In this case, the inlet openings 52 can be placed variably, as seen in particular in the longitudinal direction of the suction roller 32, in the sense that their position is selected independently of the associated suction bores 36; the Vacuum or ventilation side provided connection between the respective inlet opening 52 and the associated suction bore 36 is achieved via a suitable channel guide of the distribution channels 46. The respective inlet opening 52 is arranged to match the associated control slot 22 in the inner, acting as a control body or control flange hollow cylinder 2. The respective control slot 22 is seen in the circumferential direction of the roller with respect to starting and end point and length suitably chosen and dimensioned to the desired timing for the associated suction holes 36.

The respective control slot 22 is framed by a raised, bead-like framing which separates the vacuum region from the atmospheric vented region.

The suction roll 32 or drum, together with the distribution jacket 30 arranged on the inside thereof, rotates without contact over the control flange surface formed by the outer surface of the hollow cylinder 2.

Through the channel guide, in particular the design of the distribution channels 46, a comparatively uniform, short channel cross-section and thus a favorable for rapid gas exchange length / cross-section ratio is achieved over all suction rows formed by the suction holes 36. This makes particularly fast charge changes and short switching times achievable, and in addition the useful and the dead volume are kept particularly low.

In addition, the cylinder jacket 34 is still provided with a cleaning system. This is based on the concept of possibly removing adhering particles or material residues on the surface by means of compressed air. For this purpose, the hollow cylinder 2 is equipped with a channel for compressed air. On the output side, this opens into bores which are arranged in the bead-like boundary between the underpressure and the atmospheric region, so that compressed air can be applied to the supply duct in the rotating jacket. In particular, one in the Sense bilateral and symmetrical arrangement of the outlet openings provided that a two-sided surge can be applied to the center of the roller down. The pressure pulse can be automated, in particular synchronized with the system clock, or manually triggered.

As the illustrations of the rabbet 40 in FIG. 3 and 4 can be removed, the Saugwalzensystem is also by a suitable Geoemetriewahl and design of the surface contour in the region of the suction holes 36 for a comparatively low vacuum level, ie a process pressure only comparatively little below atmospheric pressure executed. As a result, inter alia, the gas exchange operations can be carried out with particularly short switching and reaction times. However, in order to still allow reliable process control even with such a comparatively low vacuum level, in which the holding forces required to hold the paper or material web are reliably applied, in particular to the suction roll 32 via the vacuum system 14, the exit region of the respective suction hole 36 suitable geometrically designed and contoured.

On the one hand are the suction holes 36 in the cylinder jacket 34 of the suction roll 32 (ie, in the embodiment in the respective rabbet 40, which forms a partial surface of the outer surface 60 of the cylinder jacket 34 in the assembled state with a from the inner surface of the cylinder jacket 34 to Outer surface 60 of the cylinder jacket 34 toward flared cross-section. On the other hand, and in an embodiment of the suction roll system 1 that is considered to be inherently inventive, the suction holes 36 are designed in such a way that they have a cross-sectional contour at their outside end, at which a suction surface 62 at least partially has a height, ie with respect to their spacing the central axis of the suction roll 32, approximately in the outer surface 60 of the cylinder jacket 34 of the suction roll 32 positioned support surface 64 encloses. Thus, a geometry and contouring is formed, in which in the immediate vicinity of the respective suction surface 62 provided for supporting the material supporting surface 64 is positioned on the Material can rest properly to avoid deformations such as wrinkles.

LIST OF REFERENCE NUMBERS

suction roller

hollow cylinder

The End

mounting end

drive motor

beam flange

inner space

execution

vacuum pump

Vacuum system

The End

cover

cylinder surface

control slot

diffuser shell

suction roll

cylinder surface

suction holes

cover

folding strip

arrow

contact area

plain bearing ring

guide pins

distribution channels

surface

entrance opening

surface

outer surface

suction

support surface

Claims

claims

Suction roll system (1) with a rotatably mounted cylindrical suction roll (32) whose cylinder jacket (34) is provided with a number of suction holes (36) which are individually or groupwise selectively connectable to a vacuum system (14) via a control system, the control system a fixedly mounted, with its interior (10) connected to the vacuum system (14), in the suction roll (32) protruding hollow cylinder (2) whose cylinder jacket (20) of a number of control slots (22) is broken.

A suction roll system (1) according to claim 1, wherein the control slots (22) each extend in the circumferential direction of the cylinder jacket (34).

Suction roll system (1) according to claim 1 or 2, on whose suction roll (32) on the inside a with this around the hollow cylinder (2) rotatable distributor shell (30) which is interrupted by a number of distribution channels (46).

A suction roll system (1) according to claim 3, wherein at least some of the distribution channels 46 have a cross-section widening from the inside to the outside.

A suction roll system (1) according to claim 3 or 4, wherein the or each distribution channel on the outside of the distributor jacket (30) has a cross-section extending in the longitudinal direction of the suction roll (32).

6. Saugwalzensystem (1) according to one of claims 1 to 5, wherein one of the end portions of the control system associated hollow cylinder (2) is designed as a mounting end (6), wherein the hollow cylinder (2) exclusively at its mounting end (6) on a Support structure is attached.

7. Saugwalzensystem (1) according to claim 6, the suction roller (32) at the mounting end (6) of the hollow cylinder (2) is mounted.

8. Suction roller system (1) according to one of claims 1 to 7, wherein the cylinder jacket (34) of the suction roll (32) has a number of releasably connected to the suction roll body, each having a number of suction holes (36) having sheath strip (40).

A suction roll system (1) according to any one of claims 1 to 8, wherein at least some of the suction holes (36) in the cylinder jacket (34) of the suction roll (32) extend from the inner surface of the cylinder jacket (34) to the outer surface (60) of the Cylinder jacket (34) towards flared cross-section are executed.

A suction roll system (1) according to any one of claims 1 to 9, wherein one or more of the suction holes (36) has a cross-sectional contour at its outside end, at least partially surrounding a suction surface (62) approximately in the outer surface (60) of the Cylindrical shell (34) of the suction roll (32) positioned support surface (64) encloses.

11. Plant for processing a material web, in particular a paper or pulp web, wherein the material web is guided over a number of functional roles, wherein at least one of the functional roles as Saugwalzensystem (1) according to one of claims 1 to 10 is executed.