EP1884589B1 - Stationary suction device, application and machine for manufacturing fibrous sheets with such a suction device - Google Patents
Stationary suction device, application and machine for manufacturing fibrous sheets with such a suction device Download PDFInfo
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- EP1884589B1 EP1884589B1 EP07107320A EP07107320A EP1884589B1 EP 1884589 B1 EP1884589 B1 EP 1884589B1 EP 07107320 A EP07107320 A EP 07107320A EP 07107320 A EP07107320 A EP 07107320A EP 1884589 B1 EP1884589 B1 EP 1884589B1
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- Prior art keywords
- suction device
- lubricating
- belt
- slot
- section
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Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/48—Suction apparatus
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/48—Suction apparatus
- D21F1/52—Suction boxes without rolls
Definitions
- the invention relates to a stationary suction device for a machine for producing and / or finishing a fibrous web, in particular paper, board or tissue web, which sucks a passing on a support surface of the suction device, air-permeable belt via suction openings in the support surface, in detail with the features from the preamble of claim 1; a use of the stationary suction device and machine for producing fibrous webs with such a suction device.
- suction devices are eg off WO94 / 00635 or US 5,466,341 known.
- the fibrous web is guided and dehydrated in so-called press sections between endless and revolving felt belts by press nips.
- press nips the water from the fibrous web is pressed into the felt, wherein in the course of the registered in the felt belt water is sucked with suction devices, for example in the form of tube suckers from the felt belt, so that the felt during re-run through the press nip again receptive is.
- suction devices for example in the form of tube suckers from the felt belt, so that the felt during re-run through the press nip again receptive is.
- the felt belt runs over a directed in installation position to the felt support surface on the suction device, which is penetrated by suction openings.
- the support surface is thus formed by a plurality of partial support surfaces, which are directly connected to each other depending on the design and form a Clausstütz vomnetz or describe the supporting surface in their positional relationship to each other free from a direct connection.
- the vacuum applied to the suction device pulls the water out of the felt, on the other hand, however, the required amount of vacuum applied also draws the felt belt in this area against the support surface on the suction device, so that friction between the felt belt and the support surface, in particular the Rohrsaugerbelägen is produced when designed as a pipe sucker. This friction causes heating of the bands, in particular the felts, and leads to premature wear due to abrasion. Furthermore, the Ceramic strips heated.
- the friction work can be up to 70 KW and more per meter of machine width, even under optimal boundary conditions.
- the invention is therefore based on the object, a suction device of the type mentioned in such a way that the wear is reduced due to the friction between the individual support surface areas and the felt belt and thus increases the Filzcicintervalle and unscheduled downtime of the machine can be avoided.
- the solution according to the invention should be distinguished by a low design effort.
- 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, board, tissue or other web has a support surface for the air-permeable belt passing by the suction device , wherein via suction openings in the support surface, a suction takes place.
- a lubricating gap is arranged in front of a suction opening and the partial support surface delimiting it in this direction, which is preferably pressure-tight and liquid-tight with respect to the suction openings with a device for introducing lubricating fluid between the belt and the partial supporting surface delimiting the suction opening.
- the lubrication gap extends across the width of the lubricating area across the width of the suction device.
- Under Lubricating area is understood to mean the region of the support surface to be treated with lubricant. This is characterized viewed transversely to the strip running direction by a width dimension, in the running direction of the tape by a length dimension.
- the supply of the lubricating fluid is carried out according to the invention before the first suction opening viewed in the strip running direction.
- the lubrication gap is arranged in front of the partial support surface of the respective suction opening in the strip running direction.
- this lubricating fluid in the form of lubricating water, which additives can be added, fed to the lubrication of the friction band / support surface.
- the supply of lubricating water takes place in such a way that at least one mixed friction condition is generated between the side of the band pointing in the installation position to the support surface and the support surface facing the band or the respective individual support surface region, but preferably floating friction in the operating state.
- the solution according to the invention makes it possible to produce a lubricant film between the belt and the surface of the support surface via the lubrication gap.
- 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, that is, when passing and sucking the tape, as far as possible. Furthermore, this prevents excessive drying of the belt and avoids abrasion and the associated wear.
- the lubrication of the surface also prevents damage to the support surface.
- the supply via the lubrication gap, a controlled lubrication between the belt and the support surface can be realized and the required amount of lubricating water can be kept low overall. This offers the advantage that a disturbance of the moisture transverse profile of the fibrous web is avoided by excessive penetration of lubricating fluid into the band with certainty and thus the Dry content of supported by the felt belt fibrous web is not significantly affected.
- the arrangement of the device for introducing lubricating fluid in front of the suction slots takes place in the strip running direction, viewed in relation to the stationary suction device, at least in front of the second suction opening.
- the arrangement is preferably carried out immediately before the first suction opening, so that the band and the first suction opening in the tape running direction in installation position limiting limiting support surface area already cooled and lubricated when starting the first suction slot.
- the lubrication and cooling of the tape can also be done before the second suction opening.
- a corresponding lubrication gap is connected in addition to the first and the second suction opening, so that it is ensured that even at the start of the other suction openings, the felt belts are not overheated.
- the individual suction openings are incorporated or embedded in a support surface or are formed by the, the support surface in its entirety forming part support surfaces having elements, preferably strip-shaped elements.
- the support surface can be designed to be flat or viewed in the direction of tape travel in cross-section curved. Depending on the design, the curvature may be described by a radius or two or more radii provided one behind the other.
- the suction device acts as a suction device for the conditioning of a band or according to a particularly advantageous development in additional functional alignment as Trennsaugvorraum for separating two bands, in which case the support surface is curved in the direction of tape or is 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 according to a first embodiment transverse to the direction of tape travel in Viewed mounting position selected so that it extends freely from changes in direction substantially across the width of the suction device, 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.
- 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 Trennsaugvorraum in press units with double-felted presses for the separation of these.
- This additional strip is preferably adapted in terms of their nature to the execution of the other, the or the suction slots forming strips.
- partial support surfaces forming elements are selected in which the partial support surfaces are characterized by a small roughness.
- the partial supporting surfaces forming elements are therefore preferably formed of ceramic strips, wherein the partial supporting surfaces can also be produced only by coatings.
- the additional strip of the lubricating gap to be formed is likewise formed by a ceramic strip. The arrangement of the additional strip takes place in a plane with the partial supporting surfaces forming elements, in particular the surface area, which faces the band. As a result, the leadership of the felt is not affected.
- a separate strip offers the advantage of a possible easy realizability of the adjustability of the width of the lubrication gap by the displaceable mounting of the strip, preferably on the housing. This can be made in response to changing conditions of use, such as tape speeds and desired changes in throughput adjustment and also such a suction device without additional modifications for different applications are designed.
- a lubrication gap in the support surface.
- this can be incorporated into the support surface or directly into the part supporting surface forming element, in particular the bar.
- the lubrication gap itself is preferably aligned perpendicular to the theoretical extension of the support surface. Inclination angles are also conceivable, in particular considered an inclination in the direction of the outlet by offset between inlet and outlet in the axial direction.
- the lubricating fluid is introduced selectively in the direction of the partial support surface adjoining the suction opening, in particular the suction slot.
- angular ranges with respect to the band or the adjacent support surface or partial support surface are conceivable at an angle between 90 and 30 degrees.
- An inclination in the direction of the outlet of the lubricating gap is preferably always considered in the running direction of the belt in order to be able to entrain the lubricating fluid.
- the geometry of the lubrication gap there are no restrictions.
- This is characterized by an inlet cross section and an outlet cross section.
- the inlet cross section is coupled to the device for introducing 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 lies in a plane with the outlets from the suction openings.
- the cross section between inlet and outlet from the lubrication gap can be made constant or variable.
- cross-sectional constrictions are conceivable, wherein the constriction is preferably continuous. In this case, the speed at the outlet of the lubrication gap can be influenced.
- This comprises at least one distribution device, which extends over at least a portion of the extension of the suction device in installation position transversely to the direction of the tape.
- a plurality of such sectionally arranged distribution devices is preferably provided, wherein these in their entirety preferably cover the entire lubrication area.
- the lubricating region preferably extends at least over the entire theoretical bandwidth of the band which can be guided over the support surface, in particular press felt.
- the lubrication range extends beyond the theoretical bandwidth, so that deviations in the tape guide can be compensated.
- this is preferably stored on the support surfaces forming elements or the elements coupled to these pressure and liquid-tight.
- the storage is stationary, preferably on the housing wall.
- the outlet cross section from the lubricating gap is smaller than the cross section of the distributing device.
- 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 mounted on the device viewed across the width of the lubricating gap to the strip running direction, in the simplest case by coupling the cleaning element to a carriage which is slidably 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.
- the execution and connection of the lubricating fluid supply system then takes place according to the choice of the lubricating fluid source.
- a separate circuit or a connection to other circuits can take place here.
- a coupling to other systems which are also operated depending on the operation of the machine for the production of fibrous webs, can be advantageously realized.
- the lubricating fluid may also be supplied with chemical substances for lubricity improvement and / or for chemical cleaning of the felts, such as, for example, acids, alkalis or solvents. Further, as a lubricating water and a super clear filtrate can be used.
- 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.
- Throughputs in the range between 1 to 40 l / min are provided for one meter working width, preferably 1 to 10, in particular selected between 1 and 7 l / min * m. Per bar can thereby a throughput range of 2 ⁇ ⁇ 1800 ⁇ Q 1 ⁇ 40 ⁇ ⁇ 1800 be set.
- V PM speed in [m / min]
- Q 1 volumetric flow I / (min * m)
- the lubricating gap is dimensioned with respect to its width such that it is ⁇ 15 mm, preferably ⁇ 10 mm, total preferably ⁇ 5 mm.
- the lubricating gap is preferably designed parallel to the suction opening, in particular the suction slot.
- the suction openings extend in installation position preferably transversely to the direction of the tape. Minor deviations are possible.
- FIG. 1a illustrates in schematic highly simplified representation based on a section of an axial section of a first embodiment, the basic structure of an inventively designed stationary suction device 1.
- This is the conditioning, that is dewatering an endless circulating, air-permeable belt 2, which for use in machines for the production of fibrous webs in the area of a press section is designed as a press felt and the leadership and support of a fibrous web 4 is used.
- this is between the band 2 in the form of a felt belt, as exemplified and schematized in the FIG. 2 reproduced, and another band 3, in particular a felt belt, and passed together through a press nip 7 formed by two press rolls 5 and 6.
- the function of the belts 2, in particular felt belts, consists in receiving the water pressed in the press nip 7 from the fibrous web 4.
- the press nip 7 can be made different in length depending on the forming these elements and press concepts in size. Conceivable is the execution of the press nip 7 forming press rollers 5, 6 with rigid shell or one of the press rolls 5 or 6 with a flexible circumferential jacket, which is pressed via a shoe press unit to form a long nip against the guided with the felt 2 and on the rigid outer surface of the other press roll 6 or 5 supporting fibrous web 4.
- At least one stationary suction device 1 is used.
- 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 comprises at least one interior 8, which can be coupled to a vacuum source 9 and at least one support surface 10 for supporting the belt 2.
- the support surface 10 is directed in the installation position of the suction device to the belt 2.
- the support surface 10 is at least one suction port 11, preferably a plurality of suction ports 11.1 to 11.n, 11.1, 11.2 provided here, which are connected to the interior 8 and through which the band 2 is sucked.
- suction port 11 preferably a plurality of suction ports 11.1 to 11.n, 11.1, 11.2 provided here, which are connected to the interior 8 and through which the band 2 is sucked.
- the support surface 10 can be formed from a plurality of individual partial support surfaces 12.1 to 12.n, which are formed, for example, by the surface areas of strip-shaped elements 14.1 to 14.n, here 14.1 to 14.3 or other elements facing in the installation position to the belt 2, and free from a direct coupling with each other.
- the suction openings 11.1 to 11.2 in a, the support surface 10 forming sheet-like element, for example a plate, which pass through the plate.
- the resulting partial support surfaces 12.1 to 12.n are then coupled together.
- the suction openings 11.1 to 11.n in the embodiment of the support surface 10 can be formed from the partial support surfaces 12.1 to 12.n through openings or preferably slots. These extend preferably 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 theoretical required support area for the fibrous web 4 on the belt 2 across the fibrous web running direction and thus the bandwidth b2 corresponds.
- the support surface 10 is formed by a plurality of partial support surfaces 12.1 to 12.n.
- the partial supporting surfaces 12.1 to 12.n are formed by the surface areas 13.1 to 13.n facing the band 2 on the strips 14.1 to 14.n.
- the surface areas 13.1 to 13.n are preferably each made flat. Direction changes between two adjacent bars in the direction of the belt 2 are considered possible with continuous and gradual guidance along a curved guide path, but should be avoided if possible.
- the aim is a possible flat support surface 10 from the individual partial support surfaces 12.1 to 12.n.
- a lubrication gap 16 is now provided either at least before the first or at least in front of the second suction slot 11.1 or 11.2 viewed in the strip running direction, which is coupled to a device 15 for introducing a lubricating fluid between the surface of the strips 14.1 to 14.3 and the band 2, which is arranged in the illustrated case in the suction device 1 and a fluid, preferably water, introduces the lubricating gap 16.
- the lubricating fluid is supplied via the lubricating gap 16 for producing a lubricating film between the belt 2 and the support surface 10, in particular the surface areas 13.1, on the first strip 14.1 and the belt 2 viewed in the direction of travel of the belt.
- the lubricating gap 16 is generated in the case shown by means of a further strip 17, which in the installation position in the direction of the fibrous web and thus the belt 2 viewed in front of the first or second suction slot forming bar, here 14.1, is arranged.
- the lubricating fluid which is used in particular water, introduced in the direction of the belt 2 and generates in the most ideal case a pure floating friction state between the belt 2, in particular the press felt, and the surface, in particular the surface area 13.1 of the bar 14.1.
- a closed fluid film is provided between the surface 13.1 and the suction device 1 facing side 18 of the belt 2.
- the leadership of the band 2 via the bar 14.1 is almost wear-free. This is characterized only by the internal friction in the fluid layer.
- at least one mixed friction state is generated by the action of the lubricating gap 16 and of the lubricating film between the press felt and the respective support surface, here the partial support surface 12.1.
- the FIG. 1a illustrates in a simplified schematic representation of the arrangement in front of the first suction slot, here 11.1.
- the means 15 for applying a lubricating fluid is integrated directly in the suction device 1, preferably in the housing 19 of a suction device designed as a vacuum cleaner 1.
- the device 15 is at least partially in the interior 8, which is enclosed by the housing 19, and is opposite to Interior 8, in particular the suction openings 11.1 and 11.2 executed pressure and liquid-tight.
- the coupling via the lubrication gap 16 with the support surface 10 is preferably carried out 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 belt 2 and thus considered fibrous web running direction preferably transversely to this over the entire width b2 of the belt second
- the strips 14.1 to 14.n are preferably designed in the form of ceramic strips. Other versions are conceivable.
- the strips 14.1 to 14.n are characterized on their surfaces, in particular in the installed position to the strip 2 facing surface areas 13.1 to 13.n, by a very smooth surface, in particular with low roughness.
- suction slots 11.1 to 11.n which extend transversely to the strip running direction, are provided, and these are arranged one behind the other in the strip running direction.
- FIG. 1b illustrates in schematic highly simplified representation based on a view from above on a band 2, the extension of lubricating gap 16 with a width b16 beyond the bandwidth b2 also, preferably over the entire width b1 of the suction device 1.
- the lubricating area is determined by the width b16.
- the lubrication gap extends transversely to the direction of the belt 2, which is indicated by the arrow. Angular deviations are conceivable.
- FIG. 3 clarifies a further development according to FIG. 1 in which a plurality of suction openings 11.1 to 11.n are arranged in the form of slots in the strip running direction of the belt 2 and further comprises means 15 for applying a lubricating fluid before the first suction slot 11.1 and a further second means 15.1 for applying a lubricating fluid before in the guide direction of the belt 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.
- 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 FIG. 1 described embodiment also achieved on the generation of an at least mixed friction state between Band 2 and the surfaces 13.2 and 13.1 of the strips 14.2 and 14.1.
- a further bar 17.1 is provided, which is arranged in front of the bar 14.2 spaced.
- the width of the lubricating gap 16 adjustable.
- the adjustability can be realized differently. In the simplest case, this can be done by a slidable mounting of the additional strip 17 on the suction device 1, in particular the housing 19, while maintaining the formation of a support surface part area.
- a corresponding double arrow illustrates the relative to the extension of the suction device 1 in the direction of tape travel axial displaceability of the bar 17th
- the outlet cross section in the lubricating gap should be smaller in order to achieve a uniform lubricating water throughput for the machine width than the pipe cross section of the distributor pipe.
- the lubrication gap can be designed differently in sectional view. Preferably, this is always characterized by an inlet region 34 and an outlet region 35, the individual regions being characterized by a geometry of the cross section which is constant over the region or else a variable geometry can be characterized. However, at least the cross section, in particular the cross sectional area directly at the exit from the lubricating gap 16, is larger than the cross section of the distributing device.
- FIG. 4 illustrates a particularly advantageous embodiment of a device 15 for applying a fluid, comprising a distributor 20, which is arranged substantially pressure-tight with respect to the interior 8 of the suction device 1 with additional cleaning device 23.
- the distributor 20 has according to FIG. 4a at least one opening 21, which is preferably designed as a slot according to FIG. 4b in a view AA in FIG. 4a preferably extends over the entire width b1 of the device 1. It is also conceivable, shown here by a broken line, a plurality of transversely to the strip running direction provided individual openings 21.1 to 21.n, which connect the interior 22 of the device 15 with the lubrication gap 16.
- the individual openings are here formed by way of example circular, also conceivable is any other geometry.
- the connection of the interior 22 via the opening 21 of the distributor 20 takes place with respect to 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.
- FIG. 4a illustrates in a section of an axial section of the lubrication gap 16 with the cleaning device 23rd
- FIG. 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 serves precisely to bring lubricating fluid into the region between band 2, in particular the band surface 18 and the surface portions 13.1 to 13.n.
- the cleaning device 23 serves to prevent deposits, in particular paper fibers in the gap 16.
- the cleaning device 23 comprises an engaging in the lubrication gap 16 cleaning element 24, which over the lubrication gap width b16, that is, depending on the design of the lubrication gap 16 either over a portion of the bandwidth b2 or over the entire bandwidth b2 is movable.
- the cleaning element 24 is mounted displaceably transversely to the strip running direction.
- the displaceability is realized via a drive 25.
- This one can be executed in various ways.
- mechanical solutions are conceivable.
- the cleaning element is mounted on a carriage 26, wherein the carriage is guided in a guide 27 which is stationarily coupled to the suction device 1.
- the guide is preferably part of the mounting of the device 15.
- the drive 25 is realized mechanically in the simplest case.
- the carriage 26 is guided on a spindle 28. 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 lubrication 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.
- the device 15 has a distributor 20 in the form of a tube or box.
- the distributor 20 is associated with a Schmierfluidmakerss- and - enclosuressystem. This is designated here by 29 and comprises at least one lubricating fluid supply source 30.
- the lubricating fluid supply source 30 can be embodied 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 coupled to the distributor 20. The connection can be done in different ways.
- 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.
- the FIG. 5a illustrates an embodiment with double-sided feed, which preferably takes place in the region of the transversely oriented to the direction of the belt 2 end faces of the distributor 20.
- the distribution device has at least two supply terminals 31 and 32.
- FIG. 5b is additional or Alternatively, another third supply connection 33 is provided.
- connections can be provided.
- the supply system comprises means 37 for adjusting the throughput.
- these valves include.
- the concrete execution of a control and / or regulation of the throughput can be done arbitrarily.
- the concrete routing depends on the boundary conditions.
- FIGS. 1 and 3 illustrate embodiments with a constant cross-sectional profile of the lubrication gap 16 viewed in cross section.
- inlet and outlet areas are designed with the same geometry and the same dimensions.
- deviations are also conceivable here, but not shown here, in that here as geometries, for example, narrowing outlet openings, in particular exit areas, result.
- FIG. 6 illustrates an alternative embodiment for execution with a distribution device 20.
- This is characterized in that here sectional individual manifolds 38 to 40 are provided, which are arranged side by side transversely to the direction of the belt 2 and in their entirety substantially over the width of the belt second , 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 may be larger than the actual bandwidth of the belt 2 in all embodiments. Accordingly, the embodiment of the device 15 for applying lubricating fluid also preferably takes place over the width of the band 2 and thus over the entire support surface 10.
- the size of the lubricating gaps are ⁇ 15 millimeters, preferably ⁇ 10 millimeters, particularly preferably ⁇ 5 millimeters.
- the throughput itself is in the range between 1 to 40 l / min 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 ⁇ ⁇ 1800 ⁇ Q 1 ⁇ 40 ⁇ ⁇ 1800 where v is the velocity in [m / min] and Q 1 describes the volume flow I / (min * m).
- FIGS. 7 and 8th illustrate particularly advantageous embodiments, which make it possible to use the suction device 1 as a separating suction device 41 for the separation of two felts in an optimal manner.
- FIGS. 7a and 7b illustrate in a schematic simplified representation of a further development of a suction device 1 in terms of design and design of the suction opening 11.1 transverse to the strip running direction as a wavy suction opening 42 in two views.
- Figure 7a illustrates a section of an axial section of the suction device 1.
- the lubricating gap 16 is disposed in front of the first suction port 11.1 and is formed by the strip-shaped element 14.1 and the additional strip 17, as already described.
- the suction opening 1.1 is designed as a slot and extends across the width b1 of the suction device 1 with alternating direction change, as in FIG. 7b from a top view Figure 7a shown.
- the suction opening 11.1 or 42 is also formed here by the successively spaced strips 14.1 and 14.2.
- the strips 14.1 and 14.2 are designed with at least one wavy trained geometry, wherein the single bar 14.1 and 14.2 is characterized transversely to the strip running direction by alternately changing the cross section.
- These cross-sectional changes, which describe the course of the suction slot forming wall portions are designed such that a Saugö Stammsverlauf with alternate direction change across the width b1 and thus increased suction zone 43 of the suction device 1 results.
- the suction slot describes a waveform.
- the support surface 10 is flat.
- the partial supporting surfaces 13.1 to 13.n lie in one plane.
- FIG. 8 Based on a section of an axial section by way of example a suction device 1 according to FIG. 7 with particular suitability as Trennsaugvorraum 41 curved in particular in the direction of the belt 2 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 and the curved design.
- the suction opening 11.1 is also designed here as a slot and extends with alternate directional change across the width b1 of the suction device.
- FIG. 9 exemplifies an application of a suction device 1 according to FIG. 8 in a press section 36 of a machine for producing fibrous webs as Trennsaugvoriques 41 based on a section of this.
- the fibrous web 4 is guided between two belts, the belt 2 and the belt 3 through a press nip 7, which is formed by two rollers 5 and 6.
- Band 2 acts as a lower felt belt and belt 3 as an upper felt belt, on the underside of the fibrous web 4 is guided. Both bands 3, 2 with the intermediate fibrous web 4 are guided through the press nip 7.
- a suction device 1 in the form of a separating sucker 41 at which the bands separated from each other and the fibrous web 4 is continued together with the lower band.
- the structure of the suction device 1, in particular of the separating sucker 41 substantially corresponds to that described in the previous figures, but in function as Trennsaugvorraum always an extended suction zone 43 is selected. This is preferably for a suction opening or a suction slot in the range of> 0 and ⁇ 200mm.
- the embodiment of the separating sucker 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 solution according to the invention is not limited to the embodiments. Further developments, the arrangement of the lubricating gap in front of at least the second, preferably the first suction slot in the tape running direction are conceivable.
Landscapes
- Paper (AREA)
- Advancing Webs (AREA)
Description
Die Erfindung betrifft eine stationäre Saugvorrichtung für eine Maschine zur Herstellung und/oder Veredelung einer Faserstoffbahn, insbesondere Papier-, Karton- oder Tissuebahn, welche ein an einer Stützfläche der Saugvorrichtung vorbeilaufendes, luftdurchlässiges Band über Saugöffnungen in der Stützfläche besaugt, im einzelnen mit den Merkmalen aus dem Oberbegriff des Anspruches 1; ferner eine Verwendung der stationären Saugvorrichtung und Maschine zur Herstellung von Faserstoffbahnen mit einer derartigen Saugvorrichtung.The invention relates to a stationary suction device for a machine for producing and / or finishing a fibrous web, in particular paper, board or tissue web, which sucks a passing on a support surface of the suction device, air-permeable belt via suction openings in the support surface, in detail with the features from the preamble of
Derartige Saugvorrichtungen sind z.B. aus
Bei der Herstellung von Faserstoffbahnen, insbesondere Papier- oder Kartonbahnen, wird die Faserstoffbahn in so genannten Pressenpartien zwischen endlosen und umlaufenden Filzbändern durch Pressnips geführt und entwässert. In derartigen Pressnips wird das Wasser aus der Faserstoffbahn in den Filz gepresst, wobei im weiteren Verlauf das in das Filzband eingetragene Wasser mit Saugvorrichtungen, beispielsweise in Form von Rohrsaugern aus dem Filzband gesaugt wird, so dass das Filzband beim erneuten Durchlauf durch den Pressnip wieder aufnahmefähig ist. Das Filzband läuft über eine in Einbaulage zum Filz gerichtete Stützfläche an der Saugvorrichtung, welche von Saugöffnungen durchsetzt wird. Die Stützfläche wird somit von einer Vielzahl von Teilstützflächen gebildet, die je nach Ausführung miteinander direkt verbunden sind und ein Teilstützflächennetz bilden oder aber in ihrer Lagezuordnung zueinander frei von einer direkten Verbindung die Stützfläche beschreiben. Das an der Saugvorrichtung angelegte Vakuum zieht zum einen das Wasser aus dem Filz, zum anderen wird jedoch durch die erforderliche Höhe des angelegten Vakuums das Filzband in diesem Bereich ebenfalls gegen die Stützfläche an der Saugvorrichtung gesogen, so dass Reibung zwischen Filzband und der Stützfläche, insbesondere den Rohrsaugerbelägen bei Ausführung als Rohrsauger erzeugt wird. Diese Reibung bewirkt eine Erhitzung der Bänder, insbesondere der Filze, und führt durch Abrieb zum frühzeitigen Verschleiß. Ferner werden auch die Keramikleisten erhitzt. Diese sind je nach gewähltem Keramiktyp mehr oder weniger temperaturschockempfindlich, so dass mitgerissene Wassertropfen örtlich zu Rissbildungen und dem Herausbrechen von Partikeln führen können. Diese Stellen sind extrem abrassiv und führen zum Verschleiß des Filzbandes in relativ kürzester Zeit.In the production of fibrous webs, in particular paper or board webs, the fibrous web is guided and dehydrated in so-called press sections between endless and revolving felt belts by press nips. In such press nips, the water from the fibrous web is pressed into the felt, wherein in the course of the registered in the felt belt water is sucked with suction devices, for example in the form of tube suckers from the felt belt, so that the felt during re-run through the press nip again receptive is. The felt belt runs over a directed in installation position to the felt support surface on the suction device, which is penetrated by suction openings. The support surface is thus formed by a plurality of partial support surfaces, which are directly connected to each other depending on the design and form a Teilstützflächennetz or describe the supporting surface in their positional relationship to each other free from a direct connection. On the one hand, the vacuum applied to the suction device pulls the water out of the felt, on the other hand, however, the required amount of vacuum applied also draws the felt belt in this area against the support surface on the suction device, so that friction between the felt belt and the support surface, in particular the Rohrsaugerbelägen is produced when designed as a pipe sucker. This friction causes heating of the bands, in particular the felts, and leads to premature wear due to abrasion. Furthermore, the Ceramic strips heated. Depending on the type of ceramic selected, these are more or less susceptible to thermal shock, so that entrained drops of water can locally lead to crack formation and the breaking out of particles. These places are extremely abrasive and lead to the wear of the felt in a relatively short time.
In Abhängigkeit von der Höhe des angelegten Vakuums kann die Reibarbeit auch bei optimalen Randbedingungen bis zu 70 KW und mehr pro Meter Maschinenbreite betragen.Depending on the level of the applied vacuum, the friction work can be up to 70 KW and more per meter of machine width, even under optimal boundary conditions.
Zur Reduzierung der Reibung und zur Kühlung der Oberflächen des Filzbandes wird vor der Saugvorrichtung Wasser auf den Filz gesprüht. Dazu werden Spritzrohre vorgesehen, welche Düsen aufweisen. Diese Düsen sind anfällig für Verstopfungen, so dass nicht immer eine gleichmäßige Befeuchtung über die gesamte Arbeitsbreite der Saugvorrichtung gegeben ist. Ferner können die vom Filz mitgeschleppte Luft und die dadurch entstehenden Turbulenzen das Sprühbild erheblich beeinträchtigen, so dass das im Stillstand der Maschine überprüfte Sprühbild bei Betrieb erhebliche Störungen aufweisen kann. In der Praxis sind daher immer wieder Streifen im Filz als Folge von Verschleiß oder durch überhitzte Stellen zu beobachten. In diesen Bereichen ist jedoch das Entwässerungsverhalten der Filzbänder erheblich gestört, was sich negativ auf das Feuchteprofil der Faserstoffbahn und damit auf die Eigenschaften der Faserstoffbahn und die Laufeigenschaften auswirkt, so dass das Filzband oftmals vorzeitig gewechselt werden muss, was zu außerplanmäßigen Stillstandszeiten der Maschine und damit Produktionsausfällen führt.To reduce friction and to cool the surfaces of the felt belt, water is sprayed onto the felt in front of the suction device. For this purpose, spray pipes are provided which have nozzles. These nozzles are susceptible to blockages, so that there is not always a uniform humidification over the entire working width of the suction device is given. Furthermore, the air entrained by the felt and the resulting turbulence can significantly affect the spray pattern, so that the spray pattern checked at standstill of the machine can have considerable disturbances during operation. In practice, therefore, stripes in the felt are repeatedly observed as a result of wear or overheated areas. In these areas, however, the dewatering behavior of the felt belts is significantly 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 often has to be changed prematurely, resulting in unscheduled downtime of the machine and thus Production losses leads.
Bei Verwendung von Saugvorrichtungen in Form von mehrschlitzigen Rohrsaugern, die in Einbaulage durch die in Maschinenrichtung, d.h. Laufrichtung der Faserstoffbahn und der Bänder hintereinander geschaltete Anordnung von Saugschlitzen charakterisiert ist, wird der Filz gezielt vor dem ersten Saugschlitz befeuchtet. Dabei wird jedoch bereits im ersten Saugschlitz dem Filz eine so große Wassermenge entzogen, dass der zweite, dahinter angeordnete Saugschlitz trocken angefahren wird, wobei aufgrund der Reibung zwischen Band und Stützfläche der Verschleiß und die Erwärmung in diesem Bereich und dahinter am größten ist.When using suction devices in the form of Mehrschlitzigen tube suckers, which is characterized in the installed position by the machine direction, ie direction of the fibrous web and the belts one after the other connected arrangement of suction slots, the felt is moistened targeted before the first suction slot. However, even in the first suction slot the felt such a large amount of water withdrawn that the second, arranged behind suction slot is approached dry, due to the friction between the belt and Support surface of the wear and the heating in this area and behind it is greatest.
Die nicht vorveröffentlichte Anmeldung
Der Erfindung liegt daher die Aufgabe zugrunde, eine Saugvorrichtung der eingangs genannten Art derart weiterzuentwickeln, dass der Verschleiß, bedingt durch die Reibung zwischen den einzelnen Stützflächenbereichen und dem Filzband vermindert wird und somit die Filzwechselintervalle vergrößert und unplanmäßige Stillstandszeiten der Maschine vermieden werden. Die erfindungsgemäße Lösung soll sich durch einen geringen konstruktiven Aufwand auszeichnen.The invention is therefore based on the object, a suction device of the type mentioned in such a way that the wear is reduced due to the friction between the individual support surface areas and the felt belt and thus increases the Filzwechselintervalle and unscheduled downtime of the machine can be avoided. The solution according to the invention should be distinguished by a low design effort.
Die erfindungsgemäße Lösung ist durch die Merkmale der Ansprüche 1, 27 und 28 charakterisiert. Vorteilhafte Ausführungen sind in den Unteransprüchen beschrieben.The solution according to the invention is characterized by the features of
Eine stationäre Saugvorrichtung zur Konditionierung von endlosen umlaufenden Bändern, insbesondere Pressfilzen einer Maschine zur Herstellung und/oder Veredlung einer Faserstoffbahn, insbesondere einer Papier-, Karton-, Tissue- oder anderen Bahn, weist eine Stützfläche für das an der Saugvorrichtung vorbeilaufende, luftdurchlässige Band auf, wobei über Saugöffnungen in der Stützfläche eine Besaugung erfolgt. Erfindungsgemäß ist in Laufrichtung des Bandes betrachtet vor einer Saugöffnung und der diese in dieser Richtung begrenzenden Teilstützfläche ein Schmierspalt angeordnet, der vorzugsweise druck- und flüssigkeitsdicht gegenüber den Saugöffnungen mit einer Einrichtung zum Einbringen von Schmierfluid zwischen dem Band und die die Saugöffnung begrenzende Teilstützfläche verbunden ist. Der Schmierspalt erstreckt sich über die Breite der Saugvorrichtung betrachtet über die gesamte Breite des Schmierbereichs. Unter Schmierbereich wird dabei der mit Schmiermittel zu beaufschlagende Bereich der Stützfläche verstanden. Dieser ist quer zur Bandlaufrichtung betrachtet durch eine Breitenabmessung charakterisiert, in Laufrichtung des Bandes durch eine Längenabmessung.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, board, tissue or other web, has a support surface for the air-permeable belt passing by the suction device , wherein via suction openings in the support surface, a suction takes place. According to the invention, viewed in the running direction of the belt, a lubricating gap is arranged in front of a suction opening and the partial support surface delimiting it in this direction, which is preferably pressure-tight and liquid-tight with respect to the suction openings with a device for introducing lubricating fluid between the belt and the partial supporting surface delimiting the suction opening. The lubrication gap extends across the width of the lubricating area across the width of the suction device. Under Lubricating area is understood to mean the region of the support surface to be treated with lubricant. This is characterized viewed transversely to the strip running direction by a width dimension, in the running direction of the tape by a length dimension.
Die Zuführung des Schmierfluides erfolgt erfindungsgemäß vor der in Bandlaufrichtung betrachtet ersten Saugöffnung. Der Schmierspalt wird dabei vor der Teilstützfläche der jeweiligen Saugöffnung in Bandlaufrichtung angeordnet. Über diesen wird Schmierfluid in Form von Schmierwasser, welchem Zusätze zugegeben werden können, zur Schmierung der Reibpaarung Band/Stützfläche zugeführt. Dabei erfolgt die Zuführung von Schmierwasser derart, dass zumindest ein Mischreibungszustand zwischen der in Einbaulage zur Stützfläche weisenden Seite des Bandes und der zum Band gerichteten Stützfläche beziehungsweise dem jeweiligen einzelnen Stützflächenbereich, vorzugsweise jedoch Schwimmreibung im Betriebszustand erzeugt wird.The supply of the lubricating fluid is carried out according to the invention before the first suction opening viewed in the strip running direction. The lubrication gap is arranged in front of the partial support surface of the respective suction opening in the strip running direction. About this lubricating fluid in the form of lubricating water, which additives can be added, fed to the lubrication of the friction band / support surface. In this case, the supply of lubricating water takes place in such a way that at least one mixed friction condition is generated between the side of the band pointing in the installation position to the support surface and the support surface facing the band or the respective individual support surface region, but preferably floating friction in the operating state.
Die erfindungsgemäße Lösung ermöglicht es, über den Schmierspalt einen Schmierfilm zwischen Band und Oberfläche der Stützfläche zu erzeugen. Dieser reduziert die Reibarbeit in der Reibpaarung zwischen Band, insbesondere Pressfilz, und der Stützfläche der Saugvorrichtung während des Betriebs, das heißt beim Vorbeiführen und Absaugen des Bandes, weitestgehend. Ferner verhindert dieser eine übermäßige Austrocknung des Bandes und vermeidet Abrieb sowie den damit verbundenen Verschleiß. Die Schmierung der Oberfläche verhindert ferner Beschädigungen an der Stützfläche. Durch die Zuführung über den Schmierspalt kann eine gesteuerte Schmierung zwischen Band und Stützfläche realisiert werden und die erforderliche Schmierwassermenge insgesamt gering gehalten werden. Dies bietet den Vorteil, dass eine Störung des Feuchtequerprofiles der Faserstoffbahn durch übermäßiges Eindringen von Schmierfluid in das Band mit Sicherheit vermieden wird und damit auch der Trockengehalt der vom Filzband abgestützten Faserstoffbahn nicht wesentlich beeinflusst wird.The solution according to the invention makes it possible to produce a lubricant film between the belt and the surface of the support surface via the lubrication gap. 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, that is, when passing and sucking the tape, as far as possible. Furthermore, this prevents excessive drying of the belt and avoids abrasion and the associated wear. The lubrication of the surface also prevents damage to the support surface. The supply via the lubrication gap, a controlled lubrication between the belt and the support surface can be realized and the required amount of lubricating water can be kept low overall. This offers the advantage that a disturbance of the moisture transverse profile of the fibrous web is avoided by excessive penetration of lubricating fluid into the band with certainty and thus the Dry content of supported by the felt belt fibrous web is not significantly affected.
Die Anordnung der Einrichtung zum Einbringen von Schmierfluid vor den Saugschlitzen erfolgt in Bandlaufrichtung betrachtet gegenüber der stationären Saugvorrichtung zumindest vor der zweiten Saugöffnung. Gemäß einer ersten besonders vorteilhaften Ausführung erfolgt die Anordnung vorzugsweise unmittelbar vor der ersten Saugöffnung, so dass das Band und der die erste Saugöffnung in Bandlaufrichtung in Einbaulage betrachtet begrenzende Stützflächenbereich bereits beim Anfahren des ersten Saugschlitzes gekühlt und geschmiert sind. Unter besonderen Voraussetzungen kann die Schmierung und Kühlung des Bandes auch erst vor der zweiten Saugöffnung erfolgen. Gemäß einer Weiterentwicklung wird neben dem ersten auch der zweiten Saugöffnung ein entsprechender Schmierspalt vorgeschaltet, so dass gewährleistet wird, dass auch beim Anlaufen der weiteren Saugöffnungen die Filzbänder nicht überhitzt sind.The arrangement of the device for introducing lubricating fluid in front of the suction slots takes place in the strip running direction, viewed in relation to the stationary suction device, at least in front of the second suction opening. According to a first particularly advantageous embodiment, the arrangement is preferably carried out immediately before the first suction opening, so that the band and the first suction opening in the tape running direction in installation position limiting limiting support surface area already cooled and lubricated when starting the first suction slot. Under special conditions, the lubrication and cooling of the tape can also be done before the second suction opening. According to a further development, a corresponding lubrication gap is connected in addition to the first and the second suction opening, so that it is ensured that even at the start of the other suction openings, the felt belts are not overheated.
Die einzelnen Saugöffnungen sind dabei in einer Stützfläche eingearbeitet oder eingelassen oder werden von den, die Stützfläche in ihrer Gesamtheit bildenden Teilstützflächen aufweisenden Elementen, vorzugsweise leistenförmigen Elementen, gebildet. Die Stützfläche kann dabei eben oder in Bandlaufrichtung im Querschnitt betrachtet gekrümmt ausgeführt sein. Je nach Ausbildung kann die Krümmung durch einen Radius beschrieben werden oder zwei oder mehrere hintereinander vorgesehene Radien. Die Saugvorrichtung fungiert als Saugvorrichtung für die Konditionierung eines Bandes oder aber gemäß einer besonders vorteilhaften Weiterentwicklung bei zusätzlicher Funktionsausrichtung als Trennsaugvorrichtung zur Trennung zweier Bänder, wobei in diesem Fall die Stützfläche in Bandlaufrichtung gekrümmt ausgebildet ist bzw. durch eine Richtungsänderung charakterisiert ist.The individual suction openings are incorporated or embedded in a support surface or are formed by the, the support surface in its entirety forming part support surfaces having elements, preferably strip-shaped elements. The support surface can be designed to be flat or viewed in the direction of tape travel in cross-section curved. Depending on the design, the curvature may be described by a radius or two or more radii provided one behind the other. The suction device acts as a suction device for the conditioning of a band or according to a particularly advantageous development in additional functional alignment as Trennsaugvorrichtung for separating two bands, in which case the support surface is curved in the direction of tape or is characterized by a change in direction.
Die Saugöffnungen sind vorzugsweise in Schlitzform ausgeführt. Es ist zumindest eine Saugöffnung vorgesehen, vorzugsweise sind mehrere hintereinander angeordnet. Der einzelne Schlitz erstreckt sich dabei über den gesamten erforderlichen zu besaugenden Bereich quer zur Bandlaufrichtung. Die Schlitzgeometrie ist gemäß einer ersten Ausführung quer zur Bandlaufrichtung in Einbaulage betrachtet derart gewählt, dass diese sich frei von Richtungsänderungen im wesentlichen über die Breite der Saugvorrichtung erstreckt, d. h. gerade verläuft. Gemäß einer besonders vorteilhaften Weiterentwicklung wird der Schlitz quer zur Bandlaufrichtung und damit über die Breite der Saugvorrichtung wellig bzw. mit sich wechselweise ändernder Richtung, quasi im Zick-Zack über die Breite der Saugvorrichtung ausgeführt. Wird der erfindungsgemäß vorgesehene Schmierspalt mit einer derartigen Saugschlitzausführung kombiniert, ergibt sich zum einen eine wesentlich längere Saugzone und die dadurch ebenfalls in ihrer Geometrie angepassten Teilstützflächenbereiche, insbesondere in Form von einseitig welligen Stegen oder Leisten ermöglichen zum anderen eine Abstützung des Bandes über diese längere Saugstrecke, so dass ein Eintauchen des Bandes in die Saugöffnung sicher verhindert wird und aufgrund des Schmierspaltes ein Schmierfilm zwischen Band und Stützfläche aufrechterhalten wird. Eine derartige Ausführung ist in Kombination mit einer gekrümmten Stützfläche in besonders vorteilhafter Weise für den Einsatz als Trennsaugvorrichtung in Presseneinheiten mit doppelt befilzten Pressen zur Trennung dieser einsetzbar.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 according to a first embodiment transverse to the direction of tape travel in Viewed mounting position selected so that it extends freely from changes in direction substantially across the width of the suction device, 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.
Durch die Anordnung vor der Saugöffnung, insbesondere bei Ausführung als Saugschlitz vor einem Saugschlitz, insbesondere zumindest dem ersten und/oder zweiten Saugschlitz wird der gesamte Stützflächenteilbereich, der den Saugschlitz begrenzt und zwischen Saugschlitz und Schmierspalt angeordnet ist, geschmiert. Das Band läuft daher auch nicht an der Vorderkante des Teilstützflächen bildenden Elementes in Laufrichtung des Bandes auf.By the arrangement in front of the suction opening, in particular when designed as a suction slot in front of a suction slot, in particular at least the first and / or second suction slot, the entire support surface portion which limits the suction slot and is arranged between suction slot and lubrication gap, lubricated. Therefore, the tape does not run on the front edge of the partial support surface forming element in the direction of the tape.
Die Erzeugung des Schmierspaltes kann, wie bereits ausgeführt, unterschiedlich erfolgen. Dazu werden
- a) entweder zusätzliche Elemente integriert oder aber
- b) die vorhandene Stützfläche genutzt.
- a) integrates either additional elements or else
- b) used the existing support surface.
Diese zusätzliche Leiste ist vorzugsweise hinsichtlich ihrer Beschaffenheit an die Ausführung der anderen, den oder die Saugschlitze bildenden Leisten, angepasst. Vorzugsweise werden Teilstützflächen bildende Elemente gewählt, bei welchen die Teilstützflächen sich durch eine geringe Rautiefe auszeichnen. Die Teilstützflächen bildenden Elemente werden daher vorzugsweise von Keramikleisten, wobei die Teilstützflächen auch nur durch Beschichtungen erzeugt werden können, gebildet. In Analogie dazu wird auch die zusätzliche Leiste des zu bildenden Schmierspaltes ebenfalls von einer Keramikleiste gebildet. Die Anordnung der zusätzlichen Leiste erfolgt dabei in einer Ebene mit den Teilstützflächen bildenden Elementen, insbesondere der Oberflächenbereich, welcher zum Band weist. Dadurch wird die Führung des Filzes nicht beeinträchtigt.This additional strip is preferably adapted in terms of their nature to the execution of the other, the or the suction slots forming strips. Preferably, partial support surfaces forming elements are selected in which the partial support surfaces are characterized by a small roughness. The partial supporting surfaces forming elements are therefore preferably formed of ceramic strips, wherein the partial supporting surfaces can also be produced only by coatings. By analogy with this, the additional strip of the lubricating gap to be formed is likewise formed by a ceramic strip. The arrangement of the additional strip takes place in a plane with the partial supporting surfaces forming elements, in particular the surface area, which faces the band. As a result, the leadership of the felt is not affected.
Das Vorsehen einer separaten Leiste bietet den Vorteil einer möglichen leichten Realisierbarkeit der Einstellbarkeit der Weite des Schmierspaltes durch die verschiebbare Lagerung der Leiste, vorzugsweise am Gehäuse. Damit kann in Abhängigkeit von sich ändernden Einsatzbedingungen, beispielsweise Bandlaufgeschwindigkeiten und gewünschtem veränderten Durchsatz eine Anpassung vorgenommen werden und ferner eine derartige Saugvorrichtung ohne zusätzliche Modifikationen für unterschiedliche Einsatzfälle konzipiert werden.The provision of a separate strip offers the advantage of a possible easy realizability of the adjustability of the width of the lubrication gap by the displaceable mounting of the strip, preferably on the housing. This can be made in response to changing conditions of use, such as tape speeds and desired changes in throughput adjustment and also such a suction device without additional modifications for different applications are designed.
Eine weitere Möglichkeit besteht in der direkten Integration eines Schmierspaltes in der Stützfläche. In diesem Fall kann dieser in die Stützfläche oder direkt in das die Teilstützfläche bildende Element, insbesondere die Leiste eingearbeitet werden.Another possibility is the direct integration of a lubrication gap in the support surface. In this case, this can be incorporated into the support surface or directly into the part supporting surface forming element, in particular the bar.
Mit dem Schmierspalt ist die Einrichtung zum Aufbringen des Schmierfluides gekoppelt. Dabei bestehen für die Anordnung der Einrichtung zumindest zwei grundsätzliche Möglichkeiten:
- a) Anordnung im Gehäuse der Saugvorrichtung
- b) Anordnung unmittelbar außerhalb des Gehäuses, insbesondere am Gehäuse.
- a) arrangement in the housing of the suction device
- b) arrangement immediately outside the housing, in particular on the housing.
Der Schmierspalt selbst ist vorzugsweise senkrecht zur theoretischen Verlängerung der Stützfläche ausgerichtet. Neigungswinkel sind ebenfalls denkbar, insbesondere eine Neigung in Richtung des Austrittes durch Versatz zwischen Ein- und Austritt in axialer Richtung betrachtet. In diesem Fall wird das Schmierfluid gezielt in Richtung der an die Saugöffnung, insbesondere den Saugschlitz angrenzenden Teilstützfläche eingebracht. Dabei sind Winkelbereiche gegenüber dem Band beziehungsweise der angrenzenden Stützfläche beziehungsweise Teilstützfläche in einem Winkel zwischen 90 und 30 Grad denkbar. Eine Neigung in Richtung zum Austritt des Schmierspaltes erfolgt dabei vorzugsweise immer in Laufrichtung des Bandes betrachtet, um das Schmierfluid mitreißen zu können.The lubrication gap itself is preferably aligned perpendicular to the theoretical extension of the support surface. Inclination angles are also conceivable, in particular considered an inclination in the direction of the outlet by offset between inlet and outlet in the axial direction. In this case, the lubricating fluid is introduced selectively in the direction of the partial support surface adjoining the suction opening, in particular the suction slot. In this case, angular ranges with respect to the band or the adjacent support surface or partial support surface are conceivable at an angle between 90 and 30 degrees. An inclination in the direction of the outlet of the lubricating gap is preferably always considered in the running direction of the belt in order to be able to entrain the lubricating fluid.
Bezüglich der Geometrie des Schmierspaltes bestehen keine Restriktionen. Dieser ist dabei durch einen Eintrittsquerschnitt und einen Austrittsquerschnitt charakterisiert. Der Eintrittsquerschnitt ist mit der Einrichtung zum Einbringen des Schmierfluides gekoppelt, während der Austrittsquerschnitt zwischen den Leisten, insbesondere dem Teilstützflächen bildenden Element und der zusätzlichen Leiste, vorgesehen ist und vorzugsweise in einer Ebene mit den Austritten aus den Saugöffnungen liegt. Dabei kann der Querschnitt zwischen Eintritt und Austritt aus dem Schmierspalt konstant oder aber veränderlich ausgeführt sein. Insbesondere sind Querschnittsverengungen denkbar, wobei die Verengung vorzugsweise stetig erfolgt. In diesem Fall kann die Geschwindigkeit am Austritt des Schmierspaltes beeinflusst werden.Regarding the geometry of the lubrication gap, there are no restrictions. This is characterized by an inlet cross section and an outlet cross section. The inlet cross section is coupled to the device for introducing 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 lies in a plane with the outlets from the suction openings. In this case, the cross section between inlet and outlet from the lubrication gap can be made constant or variable. In particular, cross-sectional constrictions are conceivable, wherein the constriction is preferably continuous. In this case, the speed at the outlet of the lubrication gap can be influenced.
Bezüglich der Ausführung der Einrichtung zum Einbringen des Schmierfluides bestehen ebenfalls eine Vielzahl von Möglichkeiten. Diese umfasst wenigstens eine Verteileinrichtung, welche sich über wenigstens einen Teilbereich der Erstreckung der Saugvorrichtung in Einbaulage quer zur Laufrichtung des Bandes erstreckt. Dabei ist vorzugsweise eine Mehrzahl derartiger sektional angeordneter Verteileinrichtungen vorgesehen, wobei diese in ihrer Gesamtheit vorzugsweise den gesamten Schmierbereich überdecken. Der Schmierbereich erstreckt sich vorzugsweise zumindest über die gesamte theoretische Bandbreite, des über die Stützfläche führbaren Bandes, insbesondere Pressfilzes. Vorzugsweise erstreckt sich der Schmierbereich über die theoretische Bandbreite hinaus, so dass Abweichungen in der Bandführung ausgeglichen werden können.With regard to the embodiment of the device for introducing the lubricating fluid also exist a variety of ways. This comprises at least one distribution device, which extends over at least a portion of the extension of the suction device in installation position transversely to the direction of the tape. In this case, a plurality of such sectionally arranged distribution devices is preferably provided, wherein these in their entirety preferably cover the entire lubrication area. The lubricating region preferably extends at least over the entire theoretical bandwidth of the band which can be guided over the support surface, in particular press felt. Preferably, the lubrication range extends beyond the theoretical bandwidth, so that deviations in the tape guide can be compensated.
Gemäß einer besonders vorteilhaften Ausführung ist die Verteileinrichtung als Verteilrohr - oder Kasten ausgebildet und erstreckt sich über den gesamten Schmierbereich, vorzugsweise darüber hinaus. Die einzelne Verteileinrichtung ist dabei mit einer Schmierfluidversorgungsquelle gekoppelt. Die Kopplung kann vielgestaltig erfolgen. Vorzugsweise erfolgt der Eintrag in die Verteileinrichtungen an nicht nur einer Stelle, sondern gleichzeitig an mehreren Stellen verteilt, um möglichst rasch ein gleichmäßiges Schmiermittelprofil über die gesamte Schmierbereichsbreite zu erzielen. Die Einrichtung umfasst dabei ein Schmierfluidversorgungs- und Zuführsystem, welches eine Schmiermittelmittelquelle und entsprechende Verteileinrichtungen vorsieht, die einen oder mehrere Austritte aufweisen, die mit dem Eintritt in den Schmierspalt oder die Schmierspalte gekoppelt ist. Die Kopplung der Schmiermittelversorgungsquelle erfolgt vorzugsweise, wie bereits ausgeführt, an mehreren Stellen der Verteileinrichtung. Dabei sind Anbindungen und die Einspeisung von Schmierfluid
- 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
- 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
Bei Anordnung der Einrichtung zum Aufbringen des Fluides innerhalb des Gehäuses der Saugvorrichtung ist diese vorzugsweise an den Stützflächen bildenden Elementen beziehungsweise den mit diesen gekoppelten Elementen druck- und flüssigkeitsdicht gelagert. Die Lagerung erfolgt ortsfest, vorzugsweise an der Gehäusewand.In the arrangement of the device for applying the fluid within the housing of the suction device, this is preferably stored on the support surfaces forming elements or the elements coupled to these pressure and liquid-tight. The storage is stationary, preferably on the housing wall.
Zur Erzielung eines gleichmäßigen Schmierfluiddurchsatzes über die Breite des Schmierbereiches ist der Austrittsquerschnitt aus dem Schmierspalt kleiner als der Querschnitt der Verteileinrichtung.To achieve a uniform lubricating fluid flow rate across the width of the lubricating region, the outlet cross section from the lubricating gap is smaller than the cross section of the distributing device.
Gemäß einer besonders vorteilhaften Weiterentwicklung weist die Einrichtung zum Aufbringen des Fluides in den Schmierspalt eine Reinigungseinrichtung auf. Die Reinigungseinrichtung umfasst zumindest ein Reinigungselement, welches in den Schmierspalt hinein gerichtet ist und gegenüber diesem verfahrbar ist, vorzugsweise über die gesamte Erstreckung des Schmierspaltes über den Schmierbereich quer zur Laufrichtung des Bandes. Das Reinigungselement selbst kann hinsichtlich seiner Erstreckung und damit seines Wirkungsbereiches im Schmierspalt verschieden groß ausgeführt sein. Dieses ist vorzugsweise an der Einrichtung über die Breite des Schmierspaltes zur Bandlaufrichtung betrachtet verschiebbar gelagert, im einfachsten Fall durch Ankopplung des Reinigungselementes an einen Schlitten, der in einer Gleitführung der Einrichtung zum Aufbringen des Schmierfluides verschiebbar geführt ist. Der Antrieb erfolgt im einfachsten Fall mechanisch, beispielsweise durch Lagerung auf einer Spindel, wobei die Verdrehung eine Bewegung bewirkt. Eine andere Möglichkeit ist das Vorsehen von Seilzügen oder mechanischen Gestängen, wobei diese jedoch relativ aufwendig sind. Die Betätigung kann manuell oder automatisiert gesteuert erfolgen.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 mounted on the device viewed across the width of the lubricating gap to the strip running direction, in the simplest case by coupling the cleaning element to a carriage which is slidably 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.
Gemäß einer besonders vorteilhaften Ausführung im Schmiermittelversorgungssystem sind Mittel zur Einstellung des Durchsatzes des Schmierfluides, insbesondere im Schmierspalt, vorgesehen. Diese Mittel können vielgestaltig ausgeführt sein und sind im einfachsten Fall als Ventileinrichtungen ausgeführt. Die konkrete Ausführung des Schmiermittelfluidkreislaufes erfolgt in Abhängigkeit des Einsatzfalles und der gewünschten genutzten Schmiermittelversorgungsquelle. Dabei können als Schmierfluide
- a) Frischwasser
- b) aufbereitetes Abwasser anderer Prozesse
- a) fresh water
- b) treated wastewater of other processes
Die Ausführung und Anbindung des Schmierfluidversorgungssystems erfolgt dann entsprechend der Wahl der Schmierfluidquelle. Je nach gewählter Schmierfluidquelle kann hier ein separater Kreislauf oder eine Anbindung an andere Kreisläufe erfolgen. Insbesondere, da die Schmierung ohnehin nur während des Betriebes der Maschine zur Herstellung von Faserstoffbahnen erfolgt, kann eine Ankopplung an andere Systeme, die ebenfalls in Abhängigkeit vom Betrieb der Maschine zur Herstellung von Faserstoffbahnen betrieben werden, vorteilhaft realisiert werden.The execution and connection of the lubricating fluid supply system then takes place according to the choice of the lubricating fluid source. Depending on the selected lubricating fluid source, a separate circuit or a connection to other circuits can take place here. In particular, since the lubrication takes place anyway only during operation of the machine for the production of fibrous webs, a coupling to other systems, which are also operated depending on the operation of the machine for the production of fibrous webs, can be advantageously realized.
Dem Schmierfluid können auch chemische Substanzen zur Gleitverbesserung und/oder zur chemischen Reinigung der Filze zugeführt werden, wie zum Beispiel Säuren, Laugen oder Lösungsmittel. Ferner kann als Schmierwasser auch ein Superklarfiltrat verwendet werden.The lubricating fluid may also be supplied with chemical substances for lubricity improvement and / or for chemical cleaning of the felts, such as, for example, acids, alkalis or solvents. Further, as a lubricating water and a super clear filtrate can be used.
Die Durchsatzmenge im Schmierspalt wird derart gewählt, dass zum einen eine optimale Schmierung zwischen Band und Stützflächenteilbereich gegeben ist, wobei ferner die Feuchtequerprofilstörungen durch das zusätzliche Aufbringen von Fluid möglichst gering gehalten werden beziehungsweise einen bestimmten Grenzwert nicht überschreiten sollten. Dabei werden Durchsatzmengen im Bereich zwischen 1 bis 40 I/min auf einen Meter Arbeitsbreite bezogen vorgesehen, vorzugsweise 1 bis 10, insbesondere zwischen 1 und 7 l/min *m gewählt. Pro Leiste kann dabei ein Durchsatzbereich von
V: PM-Geschwindigkeit in [m/min]
Q1 : Volumenstrom I/(min*m)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. Throughputs in the range between 1 to 40 l / min are provided for one meter working width, preferably 1 to 10, in particular selected between 1 and 7 l / min * m. Per bar can thereby a throughput range of
V: PM speed in [m / min]
Q 1 : volumetric flow I / (min * m)
Zur Erzielung einer optimalen Schmierwirkung ist der Schmierspalt hinsichtlich seiner Weite derart bemessen, dass dieser ≤ 15 mm beträgt, vorzugsweise ≤ 10 mm, insgesamt bevorzugt ≤5 mm.To achieve an optimum lubricating effect, the lubricating gap is dimensioned with respect to its width such that it is ≦ 15 mm, preferably ≦ 10 mm, total preferably ≦ 5 mm.
Der Schmierspalt ist vorzugsweise parallel zur Saugöffnung, insbesondere dem Saugschlitz ausgeführt. Die Saugöffnungen verlaufen in Einbaulage vorzugsweise quer zur Laufrichtung des Bandes. Geringe Abweichungen sind möglich.The lubricating gap is preferably designed parallel to the suction opening, in particular the suction slot. The suction openings extend in installation position preferably transversely to the direction of the tape. Minor deviations are possible.
Die erfindungsgemäße Lösung wird nachfolgend anhand von Figuren erläutert. Darin ist im einzelnen folgendes dargestellt:
- Figur 1a
- verdeutlicht in schematisiert stark vereinfachter Darstellung eine erste Ausführung einer erfindungsgemäßen stationären Saugvorrichtung im Querschnitt;
- Figur 1b
- verdeutlicht in schematisiert vereinfachter Darstellung die Zuordnung einer Saugvorrichtung gegenüber dem Band in einer Ansicht von oben;
Figur 2- verdeutlicht beispielhaft den Einsatz einer erfindungsgemäßen Saugvorrichtung in einer Pressenpartie anhand eines Ausschnittes aus einer Pressenpartie einer Maschine zur Herstellung von Faserstoffbahnen;
Figur 3- verdeutlicht in schematisiert vereinfachter Darstellung eine Weiterentwicklung einer stationären Saugvorrichtung gemäß
Figur 1 ; - Figuren 4a und 4b
- verdeutlicht in schematisiert vereinfachter Darstellung eine Ausführung der Einrichtung zum Aufbringen des Schmierfluides mit zusätzlicher Reinigungseinrichtung für den Schmierspalt;
- Figur 5a und 5b
- verdeutlichen mögliche Ausführungen der Verteileinrichtungen und Ankopplungsmöglichkeiten an eine Schmiermittelversorgungsquelle;
Figur 6- verdeutlicht eine Ausführung der Verteileinrichtung;
- Figuren 7a und 7b
- verdeutlichen eine Weiterentwicklung der Saugvorrichtung mit wellig verlaufender Saugöffnung in zwei Ansichten;
Figur 8- verdeutlicht eine Ausführung gemäß
Figur 7 mit gekrümmter Stützfläche; Figur 9- verdeutlicht eine Anwendung einer Saugvorrichtung gemäß
Figur 8 als Trennsaugvorrichtung.
- FIG. 1a
- illustrates in schematic highly simplified representation of a first embodiment of a stationary suction device according to the invention in cross section;
- FIG. 1b
- illustrates in a simplified schematic representation of the assignment of a suction device relative to the tape in a view from above;
- FIG. 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;
- FIG. 3
- illustrates in schematic simplified representation of a further development of a stationary suction device according to
FIG. 1 ; - FIGS. 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;
- FIGS. 5a and 5b
- illustrate possible embodiments of the distribution devices and coupling possibilities to a lubricant supply source;
- FIG. 6
- illustrates an embodiment of the distribution device;
- FIGS. 7a and 7b
- illustrate a further development of the suction device with undulating suction opening in two views;
- FIG. 8
- illustrates an embodiment according to
FIG. 7 with curved support surface; - FIG. 9
- illustrates an application of a suction device according to
FIG. 8 as Trennsaugvorrichtung.
Die
Bei der in der
Die Saugöffnungen 11.1 bis 11.n liegen hier in Form von Schlitzen vor. Erfindungsgemäß ist nunmehr entweder zumindest vor dem ersten oder aber zumindest vor dem zweiten Saugschlitz 11.1 oder 11.2 in Bandlaufrichtung betrachtet ein Schmierspalt 16 vorgesehen, der mit einer Einrichtung 15 zur Einbringung eines Schmierfluides zwischen der Oberfläche der Leisten 14.1 bis 14.3 und dem Band 2 gekoppelt ist, die im dargestellten Fall in der Saugvorrichtung 1 angeordnet ist und ein Fluid, vorzugsweise Wasser, über den Schmierspalt 16 einbringt. Dabei wird das Schmierfluid über den Schmierspalt 16 zur Erzeugung eines Schmierfilmes zwischen dem Band 2 und der Stützfläche 10, insbesondere den Flächenbereichen 13.1, an der in Bandlaufrichtung betrachtet ersten Leiste 14.1 und dem Band 2 zugeführt. Der Schmierspalt 16 wird im dargestellten Fall mittels einer weiteren Leiste 17 erzeugt, welche in Einbaulage in Laufrichtung der Faserstoffbahn und damit des Bandes 2 betrachtet vor der den ersten oder zweiten Saugschlitz bildenden Leiste, hier 14.1, angeordnet ist. Über den Schmierspalt 16 wird das Schmierfluid, als welches insbesondere Wasser verwendet wird, in Richtung des Bandes 2 eingebracht und erzeugt im idealsten Fall einen reinen Schwimmreibungszustand zwischen dem Band 2, insbesondere dem Pressfilz, und der Oberfläche, insbesondere dem Flächenbereich 13.1 der Leiste 14.1. In diesem Fall ist zwischen der Oberfläche 13.1 und der zur Saugvorrichtung 1 weisenden Seite 18 des Bandes 2 ein geschlossener Fluidfilm vorgesehen. Dabei erfolgt die Führung des Bandes 2 über die Leiste 14.1 nahezu verschleißfrei. Diese ist lediglich durch die innere Reibung in der Fluidschicht charakterisiert. Während des Anlaufvorganges wird durch die Wirkung des Schmierspaltes 16 und des Schmierfilmes zwischen dem Pressfilz und der jeweiligen Stützfläche, hier der Teilstützfläche 12.1, zumindest ein Mischreibungszustand erzeugt.The suction openings 11.1 to 11.n are here in the form of slots. According to the invention, a
Die
Die Leisten 14.1 bis 14.n sind vorzugsweise in Form von Keramikleisten ausgeführt. Andere Ausführungen sind denkbar. Insbesondere sind die Leisten 14.1 bis 14.n an ihren Oberflächen, insbesondere in Einbaulage zum Band 2 weisenden Flächenbereichen 13.1 bis 13.n, durch eine möglichst glatte Oberfläche, insbesondere mit geringer Rautiefe charakterisiert. Es sind jeweils eine Mehrzahl von Saugschlitzen 11.1 bis 11.n, die quer zur Bandlaufrichtung verlaufen, vorgesehen und diese sind hintereinander in Bandlaufrichtung angeordnet.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 are characterized on their surfaces, in particular in the installed position to the
Die
Bei dieser Ausführung wird sowohl der erste als auch der zweite Saugschlitz 11.1 und 11.2 geschmiert und Filzverbrennungen beziehungsweise Abrieb erfolgreich reduziert. Dies wird in Analogie zu der in
Gemäß einer besonders vorteilhaften Ausführung ist es ferner denkbar, die Weite des Schmierspaltes 16 einstellbar zu gestalten. Die Einstellbarkeit kann unterschiedlich realisiert werden. Im einfachsten Fall kann diese durch eine verschiebbare Lagerung der zusätzlichen Leiste 17 an der Saugvorrichtung 1, insbesondere dem Gehäuse 19, unter Beibehaltung der Ausbildung eines Stützflächenteilbereiches erfolgen. Ein entsprechender Doppelpfeil verdeutlicht dabei die bezogen auf die Erstreckung der Saugvorrichtung 1 in Bandlaufrichtung axiale Verschiebbarkeit der Leiste 17.According to a particularly advantageous embodiment, it is also conceivable to make the width of the
Bezüglich der Größe der Schmierspalte, insbesondere des Schmierspaltes 16, ist festzustellen, dass zumindest der Austrittsquerschnitt im Schmierspalt geringer sein sollte, um einen gleichmäßigen Schmierwasserdurchsatz für die Maschinenbreite als der Rohrquerschnitt des Verteilrohres zu erzielen. Der Schmierspalt kann in Schnittdarstellung betrachtet unterschiedlich ausgeführt sein. Vorzugsweise ist dieser immer durch einen Eintrittsbereich 34 und einen Austrittsbereich 35 charakterisiert, wobei die einzelnen Bereiche durch eine über den Bereich konstante Geometrie des Querschnittes oder aber eine veränderliche charakterisiert sein können. Zumindest ist jedoch der Querschnitt, insbesondere die Querschnittsfläche direkt am Austritt aus dem Schmierspalt 16 größer als der Querschnitt der Verteileinrichtung.With regard to the size of the lubricating gaps, in particular of the
Die
Die Ausführung gemäß
Die Versorgung der Einrichtung 15 mit Schmierfluid, insbesondere Schmierwasser, kann verschiedenartig realisiert werden. Gemäß einer ersten Ausführungsform in
Gemäß besonders vorteilhafter Ausführungen umfasst das Versorgungssystem Mittel 37 zum Einstellen des Durchsatzes. Diese können vielgestaltig ausgeführt sein. Im einfachsten Fall umfassen diese Ventile. Die konkrete Ausführung einer Steuerung und/oder Regelung des Durchsatzes kann beliebig erfolgen. Im einfachsten Fall über Ventileinrichtungen. Die konkrete Leitungsführung hängt dabei von den Randbedingungen ab.According to particularly advantageous embodiments, the supply system comprises means 37 for adjusting the throughput. 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.
Die
Die
Der Stützbereich über die Stützfläche 10 kann bei allen Ausführungen größer als die tatsächliche Bandbreite des Bandes 2 sein. Dementsprechend erfolgt vorzugsweise die Ausführung der Vorrichtung 15 zum Aufbringen von Schmierfluid ebenfalls über die Breite des Bandes 2 und damit über die gesamte Stützfläche 10.The support area over the
Bezüglich der Größe der Schmierspalte wird ausgeführt, dass diese ≤ 15 Millimeter betragen, vorzugsweise ≤ 10 Millimeter, besonders bevorzugt ≤ 5 Millimeter. Der Durchsatz selbst liegt im Bereich zwischen 1 bis 40 l/min auf den Meter Arbeitsbreite bezogen, vorzugsweise 1 bis 10 l/min, insbesondere 1 bis 7 l/min. Grenzwerte für den Durchsatz QGrenz sind nach unten durch die Aufrechterhaltung der Schmierwirkung und nach oben hindurch Feuchtequerprofilstörungen der Faserstoffbahn durch Fluideintrag in den Filz gegeben. Die Grenzwerte beziehungsweise der Durchsatzbereich pro Leiste beziehungsweise pro Fläche ist dabei durch die Beziehung
bestimmt, wobei v die Geschwindigkeit in [m/min] und
Q1 den Volumenstrom I/(min*m) beschreibt.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 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
where v is the velocity in [m / min] and
Q 1 describes the volume flow I / (min * m).
Die
Die
Die Stützfläche 10 ist eben ausgeführt. Die Teilstützflächen 13.1 bis 13.n liegen in einer Ebene. Demgegenüber verdeutlicht
Die erfindungsgemäße Lösung ist nicht auf die Ausführungsbeispiele beschränkt. Weiterentwicklungen, die Anordnung des Schmierspaltes vor zumindest dem zweiten, vorzugsweise dem ersten Saugschlitz in Bandlaufrichtung sind denkbar.The solution according to the invention is not limited to the embodiments. Further developments, the arrangement of the lubricating gap in front of at least the second, preferably the first suction slot in the tape running direction are conceivable.
- 1, 1'1, 1 '
- Saugvorrichtungsuction device
- 22
- Bandtape
- 33
- Bandtape
- 44
- FaserstoffbahnFibrous web
- 55
- Presswalzepress roll
- 66
- Presswalzepress roll
- 77
- Pressspaltpress nip
- 88th
- Innenrauminner space
- 99
- UnterdruckquelleVacuum source
- 1010
- Stützflächesupport surface
- 1111
- Saugöffnungsuction opening
- 12.1 - 12.n12.1 - 12.n
- TeilstützflächenPart support surfaces
- 13.1 - 13.n13.1 - 13.n
- Oberflächenbereichesurface areas
- 14.1 - 14.n14.1 - 14.n
- LeistenAfford
- 1515
- Einrichtung zum Aufbringen eines FluidesDevice for applying a fluid
- 1616
- Schmierspaltlubricating gap
- 17, 17.117, 17.1
- Leistestrip
- 1818
- Filzseitefelt side
- 1919
- Gehäusecasing
- 2020
- Verteileinrichtungdistributor
- 20.1-20.n20.1-20.n
- Verteileinrichtungendistribution devices
- 2121
- Öffnungopening
- 2222
- Innenrauminner space
- 2323
- Reinigungseinrichtungcleaning device
- 2424
- Reinigungselementcleaning element
- 2525
- Antriebdrive
- 2626
- Schlittencarriage
- 2727
- Führungguide
- 2828
- Spindelspindle
- 2929
- Schmiermittelversorgungs- und ZuführsystemLubricant supply and delivery system
- 3030
- SchmiermittelversorgungsquelleLubricant supply source
- 3131
- Versorgungsanschlusssupply terminal
- 3232
- Versorgungsanschlusssupply terminal
- 3333
- Versorgungsanschlusssupply terminal
- 3434
- Eintrittsbereichentry area
- 3535
- Austrittsbereichexit area
- 3636
- Pressenpartiepress section
- 3737
- Mittel zur Steuerung des DurchsatzesMeans for controlling the flow rate
- 3838
- Verteileinrichtungdistributor
- 3939
- Verteileinrichtungdistributor
- 4040
- Verteileinrichtungdistributor
- 4141
- TrennsaugvorrichtungTrennsaugvorrichtung
- 4242
- wellenförmig verlaufende SaugöffnungWavy suction opening
- 4343
- Saugzonesuction zone
Claims (30)
- Stationary suction device (1) for a machine for manufacturing fibrous webs (4), in particular paper, board or tissue webs, comprising a supporting surface (10), over which an air-permeable belt (2) running past on the suction device (1) can be sucked into the supporting surface (10) via at least two suction openings (11.1, 11.2) arranged one after another, as viewed in the running direction of the belt (2), there being arranged, before the first suction opening (11.1), as viewed in the belt running direction, and the part supporting surface (12.1 to 12.n) bounding the latter in this direction, a lubricating slot (16), which is connected to a unit (15) for introducing lubricating fluid between the belt (2) and the part supporting surface (12.1 to 12.n) bounding the suction opening (11),
characterized in that
the lubricating slot (16) extends over the entire width (b16) of the lubricating area as a single lubricating slot, this width (b16) projecting beyond the width (b2) of the belt (2) and in that the lubricating slot (16), seen in cross section, has a width in the outlet region in the belt running direction which is ≤ 10 mm. - Stationary suction device (1) according to Claim 1,
characterized in that
this comprises at least two suction openings (11, 11.1, 11.2) arranged one after another, as viewed in the running direction of the belt (2), and at least one lubricating slot (16) is arranged before the second suction opening (11.2), as viewed in the belt running direction. - Stationary suction device (1) according to Claim 1 or 2,
characterized in that
the lubricating slot (16) and the unit (15) for introducing a lubricating fluid are arranged outside a housing (19) of the stationary suction device (1) that encloses an internal space (8), and the unit (15) is fixed to the said housing. - Stationary suction device (1) according to either of Claims 1 and 2,
characterized in that
the unit (15) for introducing a lubricating fluid is arranged in the housing (19) and is coupled to the lubricating slot (16) so as to be pressure-tight and liquid-tight with respect to the suction openings (11). - Stationary suction device (1) according to one of Claims 1 to 4,
characterized in that
the supporting surface (10) is formed by elements bearing individual part supporting surfaces (12.1 to 12.n), and the lubricating slot (16) is formed by an element bearing part supporting surfaces (12.1 to 12.n) and an additional foil (17, 17.1) arranged before the said element. - Stationary suction device (1) according to one of Claims 1 to 4,
characterized in that
the supporting surface (10) is formed by elements bearing individual part supporting surfaces (12.1 to 12.n), and the lubricating slot (16) is integrated into the element bearing part supporting surfaces (12.1 to 12.n). - Stationary suction device (1) according to one of Claims 1 to 6,
characterized in that
the lubricating slot (16), as viewed in cross section, has a width w in the outlet region in the belt running direction which is ≤ 5 mm. - Stationary suction device (1) according to one of Claims 1 to 7,
characterized in that
the lubricating slot (16) is oriented in the transverse direction with respect to the running direction of the belt (2) and is characterized by an inlet cross section (34) and an outlet cross section (35), the lubricating slot (16) running at an angle with respect to the supporting surface (10) in the direction from the inlet cross section (34) to the outlet cross section (35). - Stationary suction device (1) according to one of Claims 1 to 8,
characterized in that
the lubricating slot (16) is oriented in the transverse direction with respect to the running direction of the belt (2) and is characterized by an inlet cross section (34) and an outlet cross section (35), the lubricating slot (16) running at right angles with respect to the supporting surface (10) in the direction from the inlet cross section (34) to the outlet cross section (35). - Stationary suction device (1) according to one of Claims 1 to 9,
characterized in that
the cross section of the lubricating slot (16), as viewed from the inlet (34) towards the outlet (35), is characterized by a constant width w. - Stationary suction device (1) according to one of Claims 1 to 10,
characterized in that
the cross section of the lubricating slot (16), as viewed from the inlet (34) towards the outlet (35), can be set variably. - Stationary suction device (1) according to one of Claims 1 to 11,
characterized in that
the lubricating slot (16) extends over the entire width of the lubricating area as an individual lubricating slot. - Stationary suction device (1) according to one of Claims 1 to 12,
characterized in that
the unit (15) for introducing a lubricating fluid comprises a distribution unit (20) coupled to the lubricating slot (16), which extends over at least a sub-region of the width of the lubricating area, transversely with respect to the running direction of the belt (2), and is coupled to a lubricating fluid source (30). - Stationary suction device (1) according to Claim 13,
characterized in that
the distribution unit (20) is designed as a distribution pipe and comprises at least one connection for coupling at least indirectly to the lubricating fluid source (31, 32, 33). - Stationary suction device (1) according to Claim 14,
characterized in that
the coupling to the distribution unit (20) is carried out respectively in the region of the ends and/or centrally. - Stationary suction device (1) according to one of Claims 13 to 15,
characterized in that
a plurality of distribution units (38, 39, 40) extending over the lubricating area are arranged adjacent to one another transversely with respect to the belt running direction and are coupled to one or more individual lubricating slots (16). - Stationary suction device (1) according to one of Claims 1 to 16,
characterized in that
the unit (15) for applying the lubricating fluid comprises means (37) for controlling the throughput in the lubricating slot (16). - Stationary suction device (1) according to one of Claims 13 to 17,
characterized in that
the cross section at the outlet (35) of the lubricating slot (16) is smaller than the cross section of the distribution unit (20) coupled to the lubricating slot (16). - Stationary suction device (1) according to one of Claims 1 to 18,
characterized in that
the unit (15) for introducing a lubricating fluid has a cleaning unit (23). - Stationary suction device (1) according to Claim 19,
characterized in that
the cleaning unit (23) comprises a cleaning element (24) which projects into the lubricating slot (16) and is mounted such that it can move with respect to the lubricating slot (16). - Stationary suction device (1) according to Claim 20,
characterized in that
the cleaning element (24) is mounted on a carriage (25), which is guided in the mounting of the unit (15) or the housing (19) of the device (1), and the carriage (25) is assigned a drive which moves the latter transversely with respect to the belt running direction. - Suction device (1) according to one of Claims 1 to 21,
characterized in that
the lubricating fluid used is water. - Suction device (1) according to Claim 22,
characterized in that
means are provided for adding and mixing the lubricating fluid with a solvent and/or cleaning fluid and/or friction-reducing additives. - Suction device (1) according to one of Claims 1 to 23,
characterized in that
at least that suction opening (11) which is connected upstream of the lubricating slot (16) extends over the width b1 of the suction device (1) with a changing course, in particular in a wavy or zigzag shape. - Suction device (1) according to one of Claims 1 to 24,
characterized in that
as viewed in cross section in the installed position, the supporting surface (10) is of curved design in the belt running direction over the length of the suction device (1). - Suction device (1) according to Claim 25,
characterized in that
the curvature can be described by means of at least one radius (r), preferably a plurality of radii. - Use of a suction device (1) according to one of Claims 1 to 26 as a separating suction device (41) for separating two belts (2, 3) guided together.
- Machine for manufacturing fibrous webs, in particular paper, board or tissue webs, having a press section (36) comprising at least one pressing unit, through which the fibrous web (4) is led through a press nip (7) with at least one belt (2), the belt (2) after the press nip (7) being assigned at least one suction device (1) according to one of Claims 1 to 26.
- Machine according to Claim 28,
characterized in that
the suction device (1) is assigned to a belt (2) after the fibrous web (4) has been picked up from the latter. - Machine according to Claim 28,
characterized in that
the fibrous web (4) is led through a press nip (7) between two belts (2, 3), the suction device (1) being provided after the press nip (7) as a separating suction device (41) for separating the two belts (2, 3) and transferring to one belt (2).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE202006015872U DE202006015872U1 (en) | 2006-08-04 | 2006-08-04 | Stationary suction device for machine for producing fibrous sheets, e.g. of paper, includes lubricant applicator and lubricating gap before suction openings in belt supporting surface to reduce belt wear |
DE200610036883 DE102006036883A1 (en) | 2006-08-04 | 2006-08-04 | 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 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1884589A1 EP1884589A1 (en) | 2008-02-06 |
EP1884589B1 true EP1884589B1 (en) | 2012-11-21 |
Family
ID=37681542
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07107320A Active EP1884589B1 (en) | 2006-08-04 | 2007-05-02 | Stationary suction device, application and machine for manufacturing fibrous sheets with such a suction device |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1884589B1 (en) |
DE (1) | DE202006015872U1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013218464A1 (en) | 2013-09-16 | 2014-09-18 | Voith Patent Gmbh | Stationary suction device |
DE102016218199A1 (en) * | 2016-09-22 | 2018-03-22 | Voith Patent Gmbh | Lubrication device for lubricating a belt |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ATA310785A (en) * | 1985-10-28 | 1987-02-15 | Heinz Bartelmuss | INSTALLATION ON DRAINAGE ELEMENTS |
US5328569A (en) * | 1992-06-26 | 1994-07-12 | Beloit Technologies, Inc. | Curved suction box apparatus in a papermaking machine press section |
FI93755C (en) * | 1993-07-07 | 1995-05-26 | Valmet Paper Machinery Inc | Suction roll of a paper machine |
EP1247894B1 (en) * | 2001-04-02 | 2006-05-17 | Voith Paper Patent GmbH | Press and suction element |
-
2006
- 2006-08-04 DE DE202006015872U patent/DE202006015872U1/en not_active Expired - Lifetime
-
2007
- 2007-05-02 EP EP07107320A patent/EP1884589B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
EP1884589A1 (en) | 2008-02-06 |
DE202006015872U1 (en) | 2007-01-11 |
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