DE102006036883A1 - Suction device for separating two adjoining guiding stripes useful in a machine for the production of paper-, cardboard- or fiber web, comprises a support area by which air permeable strips run on the suction device, and lubricating slit - Google Patents

Abstract

The suction device for separating two adjoining guiding stripes useful in a machine for the production of paper-, cardboard- or fiber web (4), comprises a support area (10) by which an air permeable strips run on the suction device, and a lubricating slit (16) arranged in running direction of the strip. The slit is connected with an unit for supplying lubricant between the strip and the part support area bounding the suction openings (11), which are serially arranged in rolling direction of the strip, and is arranged above the suction openings viewed in running direction of the strip. The suction device for separating two adjoining guiding stripes useful in a machine for the production of paper-, cardboard- or fiber web (4), comprises a support area (10) by which an air permeable strips run on the suction device, and a lubricating slit (16) arranged in running direction of the strip. The slit is connected with an unit for supplying lubricant between the strip and the part support area bounding the suction openings (11), which are serially arranged in rolling direction of the strip, and is arranged above the suction openings viewed in running direction of the strip. The slit is arranged outside of a housing (19) surrounding interior area of the suction device. The lubricant supply unit is arranged in the housing and is coupled with the slit over the suction opening in pressure or fluid tight manner. The support area is formed by single part support area of carrier elements. The slit and an additional strip are formed by the part support area. The slit is integrated in the part support area. The slit viewed in cross section has a value of = 5 mm in the strip rolling direction. The slit is aligned in direction diagonally to the running direction of the strip and passes in direction from inlet cross section to outlet cross-section tended opposite to the support area. The cross section of the slit is characterized through a constant value. The slit extends itself as a single lubricating slit over the total width of the lubrication area. The lubricant supply unit coupled with the lubrication slit has distribution device that extends itself over partial area of the width of the lubrication area diagonally to the running direction of the strip and that is coupled with a lubricant source. The distribution device is implemented as a distribution tube and has a connection for indirect coupling with the lubricant source. The coupling is carried out in side and/or middle area of the lubricant source. The distribution devices are arranged itself with one another diagonally to the running direction of the strip extending over the lubrication area. The lubricant supply unit has means for controlling the throughput in the slit, and a cleaning arrangement having a cleaning element, which is movably arranged inside and outside of the lubricating slit. The cross-section at the outlet of the slit is larger than the cross-section of the distribution device. The cleaning element is arranged on a sledge that is arranged in the storage of the lubricant supply unit or in the housing. The sledge is assigned as a drive, which moves diagonally to the running direction of the strip. Water is used as a lubricant. Means is arranged for adding and mixing the lubricants with a solution, cleaning fluid and/or friction reducing additives. The support area is implemented over the length of the suction device in running direction of the strip viewed in mounting position. The suction opening, which is turned to the slit, extends itself over the width of the suction device in wave or zigzag forming manner. An independent claim is included for a machine for the production of paper-, cardboard- or fiber web.

Description

The The invention relates to a stationary Suction device of a machine for manufacturing and / or finishing a fibrous web, in particular paper, board or tissue web, which one on a support surface of Suction device passing, air-permeable belt via suction openings sucked in the support surface, in detail with the features of the preamble of the claim 1; a use of the stationary suction device and machine for producing fibrous webs with such a suction device.

at the production of fibrous webs, in particular paper or Cardboard webs, the fibrous web is in so-called press sections between endless and circulating felt belts guided by press nips and dewatered. In such press nips, the water from the fibrous web in the Felt pressed, whereby in the further course the registered in the felt band Water with suction devices, for example in the form of tube suckers is sucked out of the felt belt, so that the felt belt on renewed Pass through the press nip is receptive again. The felt tape runs over one in the mounting position to the felt directed support surface on the suction device, which of suction openings is enforced. The support surface is thus formed by a plurality of partial support surfaces, depending on execution are directly connected to each other and form a partial support network or in their location assignment to each other free from a direct connection the Describe supporting surface. The vacuum applied to the suction device draws the water from the felt, on the other hand, however, by the required height of the applied Vacuum the felt in this area also against the support surface at the Suction sucked so that friction between felt belt and the Support surface, in particular the pipe sucker linings at execution is produced as a pipe sucker. This friction causes heating the bands, especially the felts, and leads by abrasion to early Wear. Furthermore, the ceramic strips are heated. These are depending on selected Ceramic type more or less sensitive to temperature shock, so that entrained Water drops locally can lead to cracking and the breaking out of particles. These Spots are extremely abrasive and lead to the wear of the felt belt in a relatively short time.

In dependence from the height the applied vacuum, the friction work can also under optimum conditions up to 70 KW and more per meter of machine width.

to Reduction of friction and cooling of the surfaces of the Felt tape is sprayed on the felt in front of the suction device water. To do this Spray pipes provided, which nozzles exhibit. These nozzles are vulnerable for blockages, so that not always a uniform moistening over the entire working width of the suction device is given. Furthermore, the The air entrained by the felt and the resulting turbulence the spray picture significantly affect so that the checked at standstill of the spray pattern when operating considerable disorders can have. In practice, therefore, again and again stripes in the Felt as a result of wear or overheated Bodies to watch. In these areas, however, is the drainage behavior the felt ribbons considerably disturbed, which has a negative effect on the moisture profile of the fibrous web and thus on the properties of the fibrous web and the running properties so that the felt belt is often changed prematurely must, what about unscheduled downtime the machine and thus production losses.

at Use of suction devices in the form of multi-slot pipe sucker, in the installed position by the machine direction, i. direction the fibrous web and the belts characterized in succession arrangement of suction slots is, the felt is moistened targeted before the first suction slot. However, the felt is already in the first suction slot the so-called size Removed amount of water that the second, behind arranged suction slot is approached dry, due to the friction between the band and support surface of the Wear and tear the warming in this area and behind it is the largest.

The not previously published application DE 10 2005 029 550 proposes to solve this problem, the application of a pressurized fluid in the form of air or water on the side facing the suction of the felt belt from the support surface before, to lift the tape from the support surface. To build up corresponding fluid cushion requires the entry of high volume flows.

Of the Invention is therefore the object of a suction device of the type mentioned in such a way that the wear, conditionally by the friction between the individual support surface areas and the felt belt is reduced and thus increases the Filinterchselintervalle and Unscheduled downtimes the machine can be avoided. The solution according to the invention is intended by a distinguish low design effort.

The inventive solution characterized by the features of claims 1, 28 and 29. advantageous versions are in the subclaims described.

A stationary Suction device for conditioning endless circulating belts, in particular Press felts of a machine for producing and / or finishing a Fibrous web, in particular a paper, cardboard, tissue or another track, has a support surface for that the suction device passing by, air-permeable belt, wherein via suction openings in the support surface an aspiration he follows. According to the invention is in Direction of the tape considered in front of a suction port and arranged in this direction limiting partial support surface a lubricating gap, the preferably pressure and liquid-tight compared to the suction ports with a device for introducing lubricating fluid between the Tape and the suction opening connected limiting partial support surface is. The lubrication gap extends across the width of the suction device at least over a partial region of the theoretical lubrication range, preferably via the entire width. Under lubricating range is the case with lubricant acting area of the support surface understood. This is viewed transversely to the strip running direction by a width dimension characterized in the running direction of the tape by a length dimension. The cover the lubrication area can also over a plurality of juxtaposed transversely to the direction of the belt Lubricating gaps are generated. However, a uniform lubricating film over the to be able to produce the entire width, this preferably extends as a single gap over the entire width.

The feed the lubricating fluid according to the invention takes place before the suction opening. The lubrication gap is in front of the partial support surface of the respective suction opening in Tape running direction arranged. about this is lubricating fluid in the form of lubricating water, which added additives can be supplied for lubrication of the friction pair band / support surface. In this case, the supply of Lubricating water such that at least one mixed friction state between the facing in mounting position to the support surface Side of the band and the band-facing support surface or the respective single support surface area, Preferably, however, floating friction is generated in the operating state.

The inventive solution makes it possible over the Lubrication gap a lubricant film between the belt and the surface of To produce support surface. This reduces the friction work in the friction pairing between band, in particular press felt, and the support surface of the suction device during operation, this means when passing and suction of the tape, as far as possible. Furthermore, this prevents excessive dehydration of the band and avoids abrasion and the associated wear. The lubrication the surface also prevents damage on the support surface. By the feeder over the Lubrication gap can be realized a controlled lubrication between the belt and the support surface be and the required amount of lubricating water total low being held. This offers the advantage of disrupting the Moisture transverse profiles of the fibrous web due to excessive penetration of lubricating fluid in the band with certainty is avoided and thus also the dry content of the supported by felt tape Fiber web is not significantly affected.

The Arrangement of the device for introducing lubricating fluid before Suction slots takes place in the strip running direction compared to the stationary Suction device at least before the second suction opening. According to a first particularly advantageous execution the arrangement is preferably carried out immediately before the first suction opening, so that the tape and the first suction opening in the tape running direction in the installed position limiting limiting surface area already when starting the first suction slot cooled and lubricated. Under special conditions, the lubrication and cooling the band also take place before the second suction opening. According to one Further development will be next to the first and the second suction opening corresponding lubrication gap upstream, so that guaranteed is that even at the start of the other suction openings the felt belts do not overheat are.

The individual suction openings are incorporated in a support surface or taken in or out of, forming the support surface in its entirety Part support surfaces having elements, preferably strip-shaped Elements formed. The support surface can while being flat or viewed in the tape running direction in cross section curved. Depending on the training, the curvature be described by a radius or two or more in a row provided radii. The suction device acts as a suction device for the Conditioning a band or according to a particularly advantageous Further development with additional Functional alignment as Trennsaugvorrichtung for the separation of two bands in which case the support surface in the direction of tape travel bent is formed or characterized by a change in direction.

The suction openings are preferably designed in slot shape. At least one suction opening is provided, preferably several are arranged one behind the other. The single slot extends over the entire required area to be vacuumed transversely to the direction of tape travel. The slot geometry is considered according to a first embodiment, viewed transversely to the direction of tape travel in the installation position such that it is free of Rich changes substantially over the width of the suction device extends, ie straight. According to a particularly advantageous development of the slot is transverse to the strip running direction and thus across the width of the suction device wavy or with alternating direction, quasi zigzag running across the width of the suction device. If the lubricating gap provided according to the invention is combined with such a suction slot design, the result is, on the one hand, a substantially longer suction zone and the partial support surface areas which are likewise adapted in geometry, in particular in the form of unilaterally wavy webs or ledges, on the other hand enable the band to be supported via this longer suction path, so that immersion of the band in the suction opening is reliably prevented and due to the lubricating gap, a lubricating film between the band and the support surface is maintained. Such an embodiment is used in combination with a curved support surface in a particularly advantageous manner for use as Trennsaugvorrichtung in press units with double-felted presses for the separation of these.

By the arrangement in front of the suction opening, in particular at execution as suction slot in front of a suction slot, in particular at least the first and / or second suction slot becomes the entire support surface partial area, which limits the suction slot and arranged between suction slot and lubrication gap is, lubricated. The tape is running Therefore, not on the front edge of the partial supporting surfaces forming element in Running direction of the tape.

• a) entweder zusätzliche Elemente integriert oder aber
• b) die vorhandene Stützfläche genutzt.

The generation of the lubrication gap can, as already stated, be carried out differently. To do this

• a) integrates either additional elements or else
• b) used the existing support surface.

in the the simplest case is according to a) in a conventional device in which the suction device a suction device housing has, on which on the belt-facing surface forming partial support surfaces Elements are stored which in their entirety describe the support surface, these may be embodied, for example, as strips which extend in the direction transverse to the direction of the tape and thus the fibrous web running direction extend, an additional Ledge provided. This forms with their aligned at an angle to the support surface and the partial support surface forming element directed surface with the part supporting surface forming Element the lubrication gap. The length becomes this essentially determined by the bar thickness, this can but also exceed. This additional strip-shaped Element also extends transversely to the direction of the Bandes and is viewed in the tape direction at least the second Suction slot, preferably arranged directly upstream of the first suction slot. The in the axial direction of the suction device or in the direction of travel of the band considered present distance between the additional Strip and the partial support surfaces forming Element determines the width of the lubrication gap.

These additional Strip is preferably in terms of their nature to the Execution of the other, the or the suction slits forming strips adapted. Preferably, partial support surfaces are forming Elements selected, in which the partial support surfaces themselves characterized by a small roughness. The partial support surfaces forming Elements are therefore preferably made of ceramic strips, wherein the Part support surfaces too can only be produced by coatings formed. In analogy will also be the extra Strip of the lubricating gap to be formed also from a ceramic strip educated. The arrangement of the additional Strip takes place in a plane with the partial support surfaces forming Elements, in particular the surface area, which is the band has. This will be the lead the felt is not affected.

The Providing a separate bar offers the advantage of a possible bar easy feasibility of the adjustability of the width of the lubrication gap by the displaceable mounting of the bar, preferably on the housing. In order to can depend on changing Operating conditions, such as tape speeds and desired changed Throughput be made an adjustment and also such Suction device without additional Modifications for different applications be conceived.

A another possibility consists in the direct integration of a lubrication gap in the Support surface. In In this case, this can be in the support surface or directly in the Part support surface forming Element, in particular the bar are incorporated.

• a) Anordnung im Gehäuse der Saugvorrichtung
• b) Anordnung unmittelbar außerhalb des Gehäuses, insbesondere am Gehäuse.

With the lubricating gap, the means for applying the lubricating fluid is coupled. There are at least two basic possibilities for the arrangement of the device:

• a) arrangement in the housing of the suction device
• b) arrangement immediately outside the housing, in particular on the housing.

In the former option, the connection is made in the housing. In this case, the device is pressure and liquid-tight connected to the lubrication gap, in particular the corresponding bar or the support surfaces forming Ele to trouble-free operation of the suction mentes. In the second case, the device is attached to the outer wall of the housing, preferably flanged, that is, this is not arranged in the vacuum-loadable interior.

Of the Lubrication gap itself is preferably perpendicular to the theoretical renewal the support surface aligned. Inclination angles are also conceivable, in particular an inclination in the direction of the outlet by offset between inlet and outlet in the axial Direction considered. In this case, the lubricating fluid is targeted in the direction of the suction opening, in particular the suction slot adjacent partial support surface introduced. There are Opposite angle ranges the band or the adjacent support surface or partial support surface in one Angles between 90 and 30 degrees are conceivable. A tilt in the direction To exit the lubrication gap is preferably always viewed in the direction of the tape to entrain the lubricating fluid can.

Regarding the Geometry of the lubrication gap are no restrictions. This is by an inlet cross section and an outlet cross section characterized. The inlet cross section is with the device coupled to introduce the lubricating fluid, while the outlet cross-section between the strips, in particular the partial support surface forming element and the additional Strip, is provided and preferably in a plane with the exits from the suction openings lies. In this case, the cross section between inlet and outlet be performed constant or variable but the lubrication gap. In particular, cross-sectional constrictions are conceivable, with the constriction preferably continuous. In this case, the speed can be influenced at the outlet of the lubrication gap.

Regarding the execution the means for introducing the lubricating fluid also exist a variety of ways. This comprises at least one distribution device which extends over at least a partial region of the extension of the suction device in the installed position extends transversely to the direction of the tape. It is preferable a plurality of such sectionally arranged distribution devices provided, these in their entirety preferably the entire Cover lubrication area. The lubricating area preferably extends at least over the total theoretical bandwidth of the feasible over the support surface band, in particular Press felt. Preferably, the lubricating area extends over the theoretical bandwidth, so that deviations in the band guide balanced can be.

• a) beidseits stirnseitig (d.h. an den quer zur Bandlaufrichtung ausgerichteten Seitenflächen) beziehungsweise
• b) in den seitlichen Endbereichen
• c) an beliebiger Stelle zwischen den Endbereichen

möglich. Die stirnseitige Kopplung bietet dabei den Vorteil einer leichten Zugängigkeit, da hier im Innenraum keine Leitungen außer der Verteileinrichtung vorgesehen werden müssen.According to a particularly advantageous embodiment, the distribution device is designed as Verteilrohr- or box and extends over the entire lubricating area, preferably beyond. The individual distributor is coupled to a lubricating fluid supply source. The coupling can take many forms. Preferably, the entry into the distributing devices takes place at not only one point but at the same time at several points in order to achieve as quickly as possible a uniform lubricant profile over the entire range of the lubricating area. The device in this case comprises a lubricating fluid supply and delivery system, which provides a lubricant source and corresponding distribution devices having one or more outlets, which is coupled to the entry into the lubrication gap or the lubrication gaps. The coupling of the lubricant supply source is preferably carried out, as already stated, at several points of the distributor. Here are connections and the supply of lubricating fluid

• a) on both sides of the front side (ie at the transverse to the strip running direction side surfaces) or
• b) in the lateral end regions
• c) anywhere between the end regions

possible. The front-side coupling offers the advantage of easy accessibility, since no lines except the distribution device must be provided in the interior.

at Arrangement of the device for applying the fluid within the housing the suction device is this preferably forming on the support surfaces Elements or the elements coupled to them. and liquid-tight stored. The storage is stationary, preferably on the housing wall.

to Achieving a uniform lubricating fluid flow over the Width of the lubrication area is the outlet cross section from the lubrication gap smaller than the cross section of the distributor.

According to a particularly advantageous development, the device for applying the fluid into the lubricating gap has a cleaning device. The cleaning device comprises at least one cleaning element, which is directed into the lubrication gap and is movable relative thereto, preferably over the entire extent of the lubrication gap across the lubrication region transverse to the direction of the tape. The cleaning element itself can be made different in size in terms of its extension and thus its range of action in the lubrication gap. This is preferably slidably viewed as viewed on the device over the width of the lubrication gap to the strip running direction, in the simplest case by coupling the cleaning element to a carriage, which is displaceably guided in a sliding guide of the device for applying the lubricating fluid. The drive is in the simplest case mechanically, for example by storage on a spindle, the rotation causes a movement. Another possibility is the provision of cables or mechanical linkages, but these are relatively expensive. The operation can be done manually or automatically controlled.

• a) Frischwasser
• b) aufbereitetes Abwasser anderer Prozesse

zum Einsatz gelangen finden.According to a particularly advantageous embodiment in the lubricant supply system means for adjusting the flow rate of the lubricating fluid, in particular in the lubrication gap, are provided. These means can be designed in many forms and are executed in the simplest case as valve devices. The concrete execution of the lubricant fluid circuit is carried out depending on the application and the desired lubricant supply source used. In this case, as lubricating fluids

• a) fresh water
• b) treated wastewater of other processes

find use to find.

The execution and connection of the lubricating fluid supply system then takes place accordingly the choice of lubricating fluid source. Depending on the selected lubricating fluid source can here a separate circuit or a connection to other circuits take place. In particular, since the lubrication anyway only during operation of the machine takes place for the production of fibrous webs, a coupling to other systems, which also depend on the operation of the machine operated for the production of fibrous webs, advantageous will be realized.

the Lubricating fluid can also chemical substances for slip improvement and / or chemical Cleaning the felts supplied such as acids, Alkalis or solvents. Further can be used as a lubricating water and a super clear filtrate.

The flow rate in the lubrication gap is chosen such that, on the one hand, optimum lubrication is provided between the belt and the support surface part region, wherein furthermore the moisture transverse profile disturbances should be kept as low as possible by the additional application of fluid or should not exceed a certain limit value. In this case, flow rates in the range of 1 to 40 l / min provided on a meter working width provided, preferably 1 to 10, in particular selected between 1 and 7 l / min · m. The flow rates Q ₁ are chosen such that they are in the range between (V / 200) ± -50%. In this case, a throughput range of 2 × V / 1800 ≦ Q ₁ ≦ 40 × V / 1800 can be set per bar.

to Achieving an optimal lubricating effect is the lubricating gap in terms its width so that it is ≤ 15 mm, preferably ≤ 10 mm, in total preferably ≤ 5 mm.

Of the Lubrication gap is preferably carried out parallel to the suction opening, in particular the suction slot. The suction ports run in installation position preferably transversely to the direction of the tape. Minor deviations are possible.

The solution according to the invention explained below with reference to figures. This is in detail the following is shown:

1a illustrates in schematic highly simplified representation of a first embodiment of a stationary suction device according to the invention in cross section;

1b illustrates in a simplified schematic representation of the assignment of a suction device relative to the tape in a view from above;

2 exemplifies the use of a suction device according to the invention in a press section on the basis of a section of a press section of a machine for the production of fibrous webs;

3 illustrates in schematic simplified representation of a further development of a stationary suction device according to 1 ;

4a and 4b illustrates in a simplified schematic representation of an embodiment of the device for applying the lubricating fluid with additional cleaning device for the lubrication gap;

5a and 5b illustrate possible embodiments of the distribution devices and coupling possibilities to a lubricant supply source;

6 illustrates an embodiment of the distribution device;

7a and 7b illustrate a further development of the suction device with undulating suction opening in two views;

8th illustrates an embodiment according to 7 with curved support surface;

9 illustrates an application of a suction device according to 8th as Trennsaugvorrich tung.

The 1a illustrates in schematic highly simplified representation with reference to a section of an axial section of a first embodiment, the basic structure of an inventively designed stationary suction device 1 , This serves for the conditioning, that is drainage of an endless circulating, air-permeable band 2 , which is designed for use in machines for the production of fibrous webs in the area of a press section as press felt and the guidance and support of a fibrous web 4 serves. For symmetrical dewatering of the fibrous web 4 this will be between the band 2 in the form of a felt belt, as exemplified and schematized in the 2 played, and another band 3 , in particular a felt belt, and together by one of two press rolls 5 and 6 formed press nip 7 guided. The function of the bands 2 , in particular felt belts, consists in the recording of the press nip 7 from the fibrous web 4 pressed water. The press nip 7 can be executed in different lengths depending on the forming these elements and press concepts in terms of size. Conceivable is the execution of the press nip 7 forming pressure rollers 5 . 6 with a rigid jacket or one of the press rolls 5 or 6 with a flexible circumferential jacket, which over a shoe press unit to form an extended nip against that with the felt belt 2 guided and on the rigid outer surface of the other press roll 6 or 5 supporting fibrous web 4 is pressed. So the felt tapes 2 . 3 on re-entry into the press nip 7 To accomplish this task, it is necessary to leave this after leaving the press nip 7 and the decrease of the fibrous web 4 of these to cleanse and drain. For this purpose, at least one stationary suction device 1 used. In the case shown are two suction devices 1 and 1' connected in series. The suction device can be designed in various ways. With regard to the geometric shape, for example, box or pipe suction devices are conceivable. The suction device 1 includes at least one interior 8th that with a vacuum source 9 can be coupled and at least one support surface 10 for supporting the band 2 , The support surface 10 is in installation position of the suction device to the tape 2 directed. In the support surface 10 is at least one suction opening 11 , Preferably, a plurality of suction openings 11.1 to 11.n , here 11.1 . 11.2 provided with the interior 8th are connected and about the the band 2 is sucked. Regarding the formation of the support surface 10 exist a variety of ways. These are essentially of the formation of the suction device 1 dependent. The support surface 10 can consist of a large number of individual partial supporting surfaces 12.1 to 12.n are formed, for example, each by the installation position to the tape 2 pointing surface areas of strip-shaped elements 14.1 to 14.n , here 14.1 to 14.3 or other elements and are free from direct coupling with each other. It is also conceivable, the suction openings 11.1 to 11.2 in one, the support surface 10 forming sheet-like element, for example a plate to provide, which pass through the plate. The resulting partial support surfaces 12.1 to 12.n are then coupled together. Depending on the configuration, the suction openings 11.1 to 11.n in the execution of the support surface 10 from the partial support surfaces 12.1 to 12.n are formed by openings or preferably slots. These preferably extend over the entire width b1 of the suction device 1 or at least a width range of the suction device 1 , which is the width of the theoretically required support area for the fibrous web 4 on the tape 2 transverse to the fibrous web running direction and thus the bandwidth b2 corresponds.

When in the 1a illustrated embodiment, the support surface 10 from a variety of partial support surfaces 12.1 to 12.n educated. The partial support surfaces 12.1 to 12.n become from the band 2 pointing surface areas 13.1 to 13.n on the last 14.1 to 14.n educated. The surface areas 13.1 to 13.n are preferably each made flat. Direction changes between two adjacent bars in the direction of the tape 2 considered are possible with continuous and gradual guidance along a curved guide path, but should be avoided if possible. The aim is a flat as possible support surface 10 from the individual partial support surfaces 12.1 to 12.n ,

The suction openings 11.1 to 11.n are here in the form of slots. According to the invention is now either at least before the first or at least before the second suction slot 11.1 or 11.2 viewed in the strip running direction, a lubrication gap 16 provided with a facility 15 for introducing a lubricating fluid between the surface of the strips 14.1 to 14.3 and the band 2 coupled, which in the case shown in the suction device 1 is arranged and a fluid, preferably water, over the lubrication gap 16 brings. In this case, the lubricating fluid over the lubrication gap 16 for producing a lubricating film between the tape 2 and the support surface 10 , in particular the surface areas 13.1 , at the first strip, viewed in the direction of tape travel 14.1 and the band 2 fed. The lubrication gap 16 is in the case shown by means of another bar 17 generated, which in installation position in the direction of the fibrous web and thus the band 2 considered in front of the first or second suction slot forming bar, here 14.1 , is arranged. About the lubrication gap 16 For example, the lubricating fluid, in particular water, is used in the direction of the belt 2 introduced and produced in ideally a pure floating state between the band 2 , in particular the press felt, and the surface, in particular the surface area 13.1 the bar 14.1 , In this case is between the surface 13.1 and the suction device 1 pointing page 18 of the band 2 provided a closed fluid film. The leadership of the band takes place 2 over the bar 14.1 almost wear-free. This is characterized only by the internal friction in the fluid layer. During the start-up process is due to the effect of the lubrication gap 16 and the lubricating film between the press felt and the respective support surface, here the partial support surface 12.1 , generates at least one mixed friction condition.

The 1a illustrates in a simplified schematic representation of the arrangement in front of the first suction slot, here 11.1 , The device 15 for applying a lubricating fluid is in the suction device 1 directly integrated, preferably in the housing 19 a suction device designed as a vacuum cleaner 1 , The device 15 is at least partially in the interior 8th from the housing 19 is enclosed, arranged and opposite the interior 8th , in particular the suction openings 11.1 and 11.2 pressure- and liquid-tight. The coupling over the lubrication gap 16 with the support surface 10 is preferably done by the pressure-tight connection to the housing 19 , The device 15 for applying a lubricating fluid here comprises a distributor 20 , in particular in the form of a distributor tube. This extends in the direction of the tape 2 and thus fibrous web running direction preferably considered transversely to this over the entire width b2 of the tape 2 ,

The strips 14.1 to 14.n are preferably designed in the form of ceramic strips. Other versions are conceivable. In particular, the strips 14.1 to 14.n on their surfaces, in particular in installation position to the tape 2 pointing surface areas 13.1 to 13.n , Characterized by the smoothest possible surface, in particular with low roughness. There are each a plurality of suction slots 11.1 to 11.n , Which extend transversely to the strip running direction, provided and these are arranged one behind the other in the strip running direction.

1b illustrates in schematic highly simplified representation based on a view from above of a tape 2 the extension of lubrication gap 16 with a width b16 beyond the bandwidth b2 addition, preferably over the entire width b1 of the suction device 1 , The lubrication range is determined by the width b16. In the illustrated case, the lubrication gap extends transversely to the direction of the tape 2 , which is indicated by arrow. Angular deviations are conceivable.

The 3 clarifies a further development according to 1 , in which in the tape running direction of the tape 2 several suction openings 11.1 to 11.n are arranged in the form of slots one behind the other and also a device 15 for applying a lubricating fluid in front of the first suction slot 11.1 and another second device 15.1 for applying a lubricating fluid before in the direction of the tape 2 second suction slot 11.2 , This arrangement describes the arrangement of the lubricating water distribution devices 20 . 20.1 in a multi-slot vacuum cleaner.

In this embodiment, both the first and the second suction slot 11.1 and 11.2 lubricated and felt burns or abrasion successfully reduced. This is analogous to that in 1 described embodiment also on the generation of an at least mixed friction state between band 2 and the surfaces 13.2 respectively 13.1 the last 14.2 respectively 14.1 achieved. This is another bar 17.1 provided the bar 14.2 spaced upstream.

According to a particularly advantageous embodiment, it is also conceivable, the width of the lubrication gap 16 adjustable to design. The adjustability can be realized differently. In the simplest case, this can be achieved by a sliding storage of the additional strip 17 at the suction device 1 , in particular the housing 19 , while maintaining the formation of a support surface partial area. A corresponding double arrow illustrates the relative to the extension of the suction device 1 in the direction of tape axial displacement of the bar 17 ,

With regard to the size of the lubrication gaps, in particular the lubrication gap 16 , it should be noted that at least the outlet cross section in the lubrication gap should be smaller in order to achieve a uniform lubricating water flow rate for the machine width than the pipe cross section of the distributor tube. The lubrication gap can be designed differently in sectional view. Preferably, this is always through an entrance area 34 and an exit area 35 characterized in that the individual regions may be characterized by a constant over the region geometry of the cross section or a variable. However, at least the cross-section, in particular the cross-sectional area directly at the outlet from the lubrication gap 16 larger than the cross section of the distributor.

The 4 illustrates a particularly advantageous embodiment of a device 15 for applying a fluid, comprising a distributor 20 which are substantially pressure-tight against above the interior 8th the suction device 1 is arranged with additional cleaning device 23 , The distribution device 20 according to 4a at least one opening 21 which is preferably designed as a slot, which is in accordance with 4b in a view AA in 4a preferably over the entire width b1 of the device 1 extends. Also conceivable, shown here by a broken line, a plurality of individual openings provided transversely to the strip running direction 21.1 to 21.n that the interior 22 the device 15 with the lubrication gap 16 connect. The individual openings are here formed by way of example circular, also conceivable is any other geometry. The connection of the interior 22 over the opening 21 the distribution device 20 takes place opposite the suction openings 11.1 to 11.n preferably pressure and liquid-tight, so that the application of the fluid can be independent of the intended suction effect.

The execution according to 4a illustrates in a section of an axial section the lubrication gap 16 with the cleaning device 23 , 4b schematically illustrates a simplified view AA. The cleaning device 23 serves the lubrication gap cleaning. The lubrication gap 16 has a width w, which is smaller than the width of the suction openings and just serves to lubricating fluid in the area between band 2 , in particular the band surface 18 and the subareas 13.1 to 13.n , bring to. The cleaning device 23 serves to avoid deposits, especially paper fibers in the gap 16 , The cleaning device 23 includes one in the lubrication gap 16 engaging cleaning element 24 , Which over the lubricating gap width b16, that is, depending on the design of the lubrication gap 16 either over a part of the bandwidth b2 or across the entire bandwidth b2 is traversable. The cleaning element 24 is slidably mounted transversely to the direction of tape travel. The displacement is via a drive 25 realized. This can be carried out in various ways. Preferably, mechanical solutions are conceivable. In the simplest case, the cleaning element is on a carriage 26 stored, with the carriage in a stationary with the suction device 1 coupled leadership 27 is guided. The guide is preferably part of the storage of the device 15 , The drive 25 is realized mechanically in the simplest case. This is the sled 26 on a spindle 28 guided. Also conceivable is the coupling of the carriage 26 with a cable or other adjustment mechanism. The arrangement of the cleaning element 24 takes place outside the suction device 1 , in particular outside the lubricating width b16 and is traversed within the lubricating range b16 if necessary. The method can be carried out in a particularly advantageous manner during operation.

The supply of the device 15 With lubricating fluid, in particular lubricating water, can be realized in various ways. According to a first embodiment in 5a instructs the institution 15 a distribution device 20 in the form of a pipe or box. The distribution device 20 is assigned a Schmierfluidversorgungs- and -führungssystem. This is here with 29 denotes and includes at least one lubricating fluid supply source 30 , The lubricating fluid supply source 30 can be performed in various ways. Conceivable is a coupling to a fresh water network or to a sewage system of other areas of such a machine for the production of fibrous webs. The lubricating water supply source 30 is with the distribution device 20 coupled. The connection can be done in different ways. Preferably, a multiple connection is selected for the most uniform supply of lubricating water, so that the feed into the distributor tube takes place at various points, preferably more than one. This makes it possible, on the one hand, to keep the cross sections for the distributor tube itself as small as possible and / or to distribute the uniformity of the lubricant fluid quantity over the cross section in an improved manner. The 5a illustrates an embodiment with double-sided feed, which preferably in the region of the transverse to the direction of the tape 2 aligned end faces of the distributor 20 he follows. In this case, the distribution device has at least two supply connections 31 and 32 on. According to 5b is additionally or alternatively yet another third supply connection 33 intended. Depending on the width of the distribution device 20 can be provided additional additional, not shown here connections.

According to particularly advantageous embodiments, the supply system comprises means 37 for adjusting the flow rate. These can be designed in many forms. In the simplest case, these valves include. The concrete execution of a control and / or regulation of the throughput can be done arbitrarily. In the simplest case via valve devices. The concrete routing depends on the boundary conditions.

The 1 and 3 clarify explanations with constant cross-sectional profile of the lubrication gap 16 considered in cross-section. Preferably, inlet and outlet areas are designed with the same geometry and the same dimensions. However, deviations are also conceivable here, but not shown here, in that here as geometries, for example, narrowing outlet openings, in particular exit areas, result.

The 6 illustrates an alternative embodiment for execution with a distribution device 20 , This is characterized by the fact that here sectional single distributor 38 to 40 are provided, the side by side transverse to the direction of the belt 2 are arranged and in their entirety substantially across the width of the tape 2 , in particular the suction device 1 , extend. It is crucial that the arrangement takes place transversely to the strip running direction such that the lubrication takes place over the entire width b2.

The support area over the support surface 10 can be greater than the actual bandwidth of the tape for all designs 2 be. Accordingly, the execution of the device is preferably carried out 15 for applying lubricating fluid also across the width of the belt 2 and thus over the entire support surface 10 ,

With regard to the size of the lubricating gaps, it is stated that these are ≦ 15 millimeters, preferably ≦ 10 millimeters, particularly preferably ≦ 5 millimeters. The throughput itself is in the range between 1 to 40 l / min based on the meter working width, preferably 1 to 10 l / min, in particular 1 to 7 l / min. Limit values for the throughput Q _limits are given downwards by the maintenance of the lubricating effect and upwards through moisture cross profile disturbances of the fibrous web by fluid entry into the felt. The limit values or the throughput range per bar or per area is determined by the relationship 2 × V 1800 ≤ Q 1 ≤ 40 × V 1800 determined, where
V is the volume flow and
Q _{1 describes} the throughput.

The 7 and 8th illustrate particularly advantageous embodiments, which allow the suction device 1 also as a separating suction device 41 to use for the separation of two felts in an optimal way.

The 7a and 7b illustrate in schematic simplified representation of a further development of a suction device 1 with regard to the design and construction of the suction opening 11.1 transverse to the strip running direction as a wavy suction opening 42 in two views. 7a illustrates a section of an axial section of the suction device 1 , The lubrication gap 16 is in front of the first suction opening 11.1 arranged and is made of the strip-shaped element 14.1 and the additional bar 17 , as already described, formed. The suction opening 1.1 is designed as a slot and extends across the width b1 of the suction device 1 with alternate direction change, as in 7b from a top view 7a shown. The suction opening 11.1 respectively. 42 is also here of the successively arranged arranged strips 14.1 and 14.2 educated. The strips 14.1 and 14.2 However, are designed with at least one-sided wavy trained geometry, wherein the single bar 14.1 respectively. 14.2 is characterized transversely to the strip running direction by alternating cross-sectional changes. These cross-sectional changes, which describe the course of the wall sections forming the suction slot, are designed in such a way that a suction opening course with alternating direction changes over the width b1 and thus enlarged suction zone 43 the suction device 1 results. In the illustrated case, the suction slot describes a waveform.

The support surface 10 is just executed. The partial support surfaces 13.1 to 13.n lie in a plane. In contrast clarifies 8th Based on a section of an axial section exemplifies a suction device 1 according to 7 with particular suitability as Trennsaugvorrichtung 41 with particular in the direction of the band to be supported 2 curved trained support surface 10 and thus also the arrangement of the partial support surfaces 12.1 . 12.2 on at least one radius of curvature r or its curved design. The suction opening 11.1 is also designed as a slot and extends with alternate directional change across the width b1 of the suction device.

9 exemplifies an application of a suction device 1 according to 8th in a press section 36 a machine for producing fibrous webs as Trennsaugvorrichtung 41 based on a section of this. This is the fibrous web 4 between two bands, the band 2 and the band 3 through a press nip 7 led by two rollers 5 and 6 is formed. tape 2 acts as a lower felt band and band 3 as the upper felt belt, on the underside of the fibrous web 4 to be led. Both bands 3 . 2 with the intermediate fibrous web 4 be through the press nip 7 guided. At this closes a suction device 1 in the form of a vacuum cleaner 41 at which the bands separated from each other and the fibrous web 4 is continued together with the lower band. This is done in the extended suction zone 43 the suction device 1 , in particular the separating sucker 41 with inventive lubrication, in particular ledge lubrication. The structure of the suction device 1 , in particular the separating sucker 41 Corresponds essentially to that described in the previous figures, but always an extended suction zone when functioning as Trennsaugvorrichtung 43 is selected. This is preferably for a suction opening or a suction slot in the range of> 0 and ≤ 200 mm. The design of the vacuum cleaner 41 takes place here by way of example with a curved support surface 10 wherein the curvature can be described here by at least two radii.

The inventive solution not on the embodiments limited. Further developments, the arrangement of the lubrication gap before at least the second, preferably the first suction slot in the strip running direction are conceivable.

1, 1'

suction device

2

tape

3

tape

4

Fibrous web

5

press roll

6

press roll

7

press nip

8th

inner space

9

Vacuum source

10

support surface

11

suction opening

12.1-12.n

Part support surfaces

13.1-13.n

surface areas

14.1-14.n

Afford

15

Facility for applying a fluid

16

lubricating gap

17 17.1

strip

18

felt side

19

casing

20

distributor

20.1-20.n

distribution devices

21

opening

22

inner space

23

cleaning device

24

cleaning element

25

drive

26

carriage

27

guide

28

spindle

29

Schmiermittelversorgungs- and delivery system

30

Lubricant supply source

31

supply terminal

32

supply terminal

33

supply terminal

34

entry area

35

exit area

36

press section

37

medium for controlling the throughput

38

distributor

39

distributor

40

distributor

41

Trennsaugvorrichtung

42

wavy suction opening

43

suction zone

Claims (31)

Stationary suction device ( 1 ) a machine for producing fibrous webs ( 4 ), in particular paper, board or tissue webs, comprising a support surface ( 10 ), on the one at the suction device ( 1 ) passing air-permeable belt ( 2 ) via suction openings ( 11 ) in the support surface ( 10 ) is sucked; characterized by the following features: one in the running direction of the belt ( 2 ) viewed in front of a suction opening ( 11 ) and this in this direction limiting partial support surface ( 12.1 to 12.n ) arranged lubricating gap ( 16 ), equipped with a facility ( 15 ) for introducing lubricating fluid between the belt ( 2 ) and the suction opening ( 11 ) limiting partial support surface ( 12.1 to 12.n ) connected is. Stationary suction device ( 1 ) according to claim 1, characterized in that these at least two in the running direction of the tape ( 2 ) considers successively arranged suction openings ( 11 . 11.1 . 11.2 ) and at least one lubrication gap ( 16 ) in front of the second suction opening ( 11.2 ) is arranged viewed in the tape running direction. Stationary suction device ( 1 ) according to claim 1 or 2, characterized in that these at least two in the running direction of the band ( 2 ) considers successively arranged suction openings ( 11 ) and at least one lubrication gap ( 16 ) in front of the first suction opening ( 11.1 ) is arranged. Stationary suction device ( 1 ) according to claim 3, characterized in that the lubricating gap ( 16 ) and the facility ( 15 ) for introducing a lubricating fluid outside of an interior space ( 8th ) enclosing housing ( 19 ) of the stationary suction device ( 1 ) and the facility ( 15 ) is attached to this. Stationary suction device ( 1 ) according to one of claims 1 to 3, characterized in that the device ( 15 ) for introducing a lubricating fluid in the housing ( 19 ) is arranged and pressure and liquid-tight against the suction openings ( 11 ) with the lubricating gap ( 16 ) is coupled. Stationary suction device ( 1 ) according to one of claims 1 to 5, characterized in that the support surface ( 10 ) of individual partial supporting surfaces ( 12.1 to 12.n ) supporting elements is formed and the lubricating gap ( 16 ) of a partial support surface ( 12.1 to 12.n ) carrying element and an upstream this additional bar ( 17 . 17.1 ) is formed. Stationary suction device ( 1 ) according to one of claims 1 to 5, characterized in that the support surface ( 10 ) of individual partial supporting surfaces ( 12.1 to 12.n ) supporting elements is formed and the lubricating gap ( 16 ) in the partial support surfaces ( 12.1 to 12.n ) supporting element is integrated. Stationary suction device ( 1 ) according to one of claims 1 to 7, characterized in that the lubricating gap ( 16 ) viewed in cross-section, in the outlet region has a width w in the strip running direction, which is ≤ 15 mm, preferably ≤ 10 mm, most preferably ≤ 5 mm. Stationary suction device ( 1 ) according to one of claims 1 to 8, characterized in that the lubricating gap ( 16 ) in the direction transverse to the direction of the tape ( 2 ) is aligned and by an inlet cross-section ( 34 ) and an outlet cross-section ( 35 ), wherein the lubricating gap ( 16 ) in the direction of the inlet cross section ( 34 ) to the outlet cross-section ( 35 ) opposite the support surface ( 10 ) inclined. Stationary suction device ( 1 ) according to one of claims 1 to 9, characterized in that the lubricating gap ( 16 ) in the direction transverse to the direction of the tape ( 2 ) is aligned and by an inlet cross-section ( 34 ) and an outlet cross-section ( 35 ), wherein the lubricating gap ( 16 ) in the direction of the inlet cross section ( 34 ) to the outlet cross-section ( 35 ) opposite the support surface ( 10 ) is vertical. Stationary suction device ( 1 ) according to one of claims 1 to 10, characterized in that the cross section of the lubricating gap ( 16 ) from the entrance ( 34 ) to the exit ( 35 ) characterized by a constant width w. Stationary suction device ( 1 ) according to one of claims 1 to 11, characterized in that the cross section of the lubricating gap ( 16 ) from the entrance ( 34 ) to the exit ( 35 ) is variably adjustable. Stationary suction device ( 1 ) according to one of claims 1 to 12, characterized in that the lubricating gap ( 16 ) extends as a single lubrication gap over the entire width of the lubricating area. Stationary suction device ( 1 ) according to one of claims 1 to 13, characterized in that the device ( 15 ) for introducing a lubricating fluid one with the lubricating gap ( 16 ) coupled distribution device ( 20 ), which extends over at least a portion of the width of the lubricating region transverse to the direction of the tape ( 2 ) and with a lubricating fluid source ( 30 ) is coupled. Stationary suction device ( 1 ) according to claim 14, characterized in that the distribution device ( 20 ) is designed as a manifold and at least one connection for at least indirect coupling with the lubricating fluid source ( 31 . 32 . 33 ). Stationary suction device ( 1 ) according to claim 15, characterized in that the coupling to the distribution device ( 20 ) takes place respectively in the region of the end faces and / or in the middle. Stationary suction device ( 1 ) according to one of claims 14 to 16, characterized in that a plurality of transverse to the strip running direction extending over the lubrication region distribution devices ( 38 . 39 . 40 ) are arranged adjacent to each other with one or more individual lubrication gaps ( 16 ) are coupled. Stationary suction device ( 1 ) according to one of claims 1 to 17, characterized in that the device ( 15 ) for applying the lubricating fluid agent ( 37 ) for controlling the throughput in the lubrication gap ( 16 ). Stationary suction device ( 1 ) according to one of claims 14 to 18, characterized in that the cross section at the outlet ( 35 ) of the lubricating gap ( 16 ) is less than the cross section of the lubrication gap ( 16 ) coupled distribution device ( 20 ). Stationary suction device ( 1 ) according to one of claims 1 to 19, characterized in that the device ( 15 ) for introducing a lubricating fluid, a cleaning device ( 23 ) having. Stationary suction device ( 1 ) according to claim 20, characterized in that the cleaning device ( 23 ) a cleaning element ( 24 ), which enters the lubricating gap ( 16 ) and opposite the lubricating gap ( 16 ) is movably mounted. Stationary suction device ( 1 ) according to claim 21, characterized in that the cleaning element ( 24 ) on a sledge ( 25 ) stored in the storage facility ( 15 ) or the housing ( 19 ) of the device ( 1 ) and the carriage ( 25 ) is associated with a drive which moves transversely to the direction of tape travel. Suction device ( 1 ) according to one of claims 1 to 22, characterized in that water is used as lubricating fluid. Suction device ( 1 ) according to claim 23, characterized in that means for adding and mixing the lubricating fluid with a solvent and / or cleaning fluid and / or friction-reducing additives are provided. Suction device ( 1 ) according to one of Ansprü che 1 to 24, characterized in that at least the suction opening ( 11 ), which the lubricating gap ( 16 ) is connected upstream, across the width b1 of the suction device ( 1 ) extends with changing course, in particular wave or zigzag-shaped. Suction device ( 1 ) according to one of claims 1 to 25, characterized in that the support surface ( 10 ) over the length of the suction device ( 1 ) in the tape running direction in installation position in cross-section considered curved. Suction device ( 1 ) according to claim 26, characterized in that the curvature by at least one radius (r), preferably a plurality of radii is writable. Use of a suction device ( 1 ) according to one of claims 1 to 27 as a separating suction device ( 41 ) for separating two mutually guided bands ( 2 . 3 ). Machine for producing fibrous webs, in particular paper-board or tissue webs with a press section ( 36 ), comprising at least one press unit, through which the fibrous web ( 4 ) with at least one band ( 2 ) through a press nip ( 7 ), whereby the tape ( 2 ) behind the press nip ( 7 ) at least one suction device ( 1 ) according to one of claims 1 to 27 assigned. Machine according to claim 29, characterized in that the suction device ( 1 ) a band ( 2 ) behind the decrease of the fibrous web ( 4 ) is assigned by this. Machine according to claim 29, characterized in that the fibrous web ( 4 ) between two bands ( 2 . 3 ) through a press nip ( 7 ), wherein behind the press nip ( 7 ) the suction device ( 1 ) as Trennsaugvorrichtung ( 41 ) for the separation of the two bands ( 2 . 3 ) and handover to a band ( 2 ) is provided.