EP1753909A1

EP1753909A1 - Cleaning device

Info

Publication number: EP1753909A1
Application number: EP05740038A
Authority: EP
Inventors: Hartmut Schneider; Karl-Heinz Straub; Denis Miklau; Guenther Prinz; Alexander Studentschnig
Original assignee: Voith Patent GmbH
Current assignee: Voith Patent GmbH
Priority date: 2004-05-19
Filing date: 2005-04-28
Publication date: 2007-02-21
Anticipated expiration: 2025-04-28
Also published as: ATE447070T1; EP1753909B1; DE502005008413D1; DE102004025291A1; WO2005113890A1

Abstract

The invention relates to a device (1) for cleaning a conveyor belt (2) of a web-processing machine. Said device comprises at least one cleaning nozzle (3) through which the conveyor belt (2) is impinged upon with a cleaning medium (4). The cleaning nozzle (3) is mounted in such a manner that the cleaning medium (4) hits the conveyor belt (2) in a cleaning section (5) as a jet which is always inclined against the direction of travel of the conveyor belt (2) at an angle of incidence alpha of 5 DEG to 85 DEG .

Description

cleaning device

The invention relates to a device for cleaning a conveyor belt of a web processing machine, in particular a machine for the production or further processing of paper, cardboard or tissue.

A large number of conveyor belts are used in a paper machine to transport a fibrous web to be produced. The conveyor belts are used, for example, in the form of forming fabrics in the forming section, in the form of press felts in the press section and in the form of drying fabrics in the drying section or as transfer belts. The screens and felts are often at least partially designed as fabric bands with an open pore structure.

During operation of the paper machine, the conveyor belts are increasingly contaminated by soiling, for example in the fiber suspension, such as adhesives or other additives. For example, in the case of a fabric tape, the pores and meshes settle over time with the above-mentioned Fabrics too.

Several devices for cleaning a conveyor belt of a web processing machine are known from the prior art.

For example, EP 0 731 212 A1 discloses a cleaning device with rotatable cleaning nozzles. According to this publication, the cleaning nozzles are inclined against the transport path, the rotation of the nozzles continuously changing the direction of inclination of the nozzles between the inclination in the running direction of the transport path and the inclination against the direction of the transport path. According to this document, the cleaning medium thrown back from the conveyor belt led away via a suction channel, which is arranged parallel to the axis of rotation of the cleaning nozzles.

It is the object of the present invention to propose a cleaning device which has an improved cleaning performance when removing dirt from a conveyor belt.

The object is achieved by the features of patent claim 1. Advantageous embodiments and developments of the invention are specified in the subclaims.

According to the preamble, it is a device for cleaning a preferably moving conveyor belt of a web processing machine. The device has at least one cleaning nozzle through which a cleaning medium can be applied to the moving conveyor belt.

According to the invention, the at least one cleaning nozzle is arranged such that the cleaning medium is always inclined in a jet shape against the running direction of the conveyor belt and meets the conveyor belt at a cleaning point at an angle of incidence α of greater than 5 ° and less than 85 °.

The conveyor belt to be cleaned moves under the cleaning point. The arrangement of the cleaning nozzle inclined according to the invention such that the cleaning medium is always sprayed as a jet inclined against the running direction of the conveyor belt and hits the conveyor belt at an angle of incidence α between 5 ° and 85 °, the relative speed between the conveyor belt to be cleaned and the Cleaning medium increased. Due to the increase in speed, the impulse between the cleaning medium and contamination on the conveyor belt is increased, which considerably improves the cleaning performance. Furthermore, the jet of the cleaning medium "peels" or "scoops" the dirt off the surface of the transport path to be cleaned, in that the dirt particles are washed down and lifted off due to the oblique impact.

In addition, in the case of an oblique impact, a smaller proportion of the cleaning medium penetrates into a meshed and / or porous structure of a conveyor belt than is the case when the cleaning medium falls vertically. Since a conveyor belt generally only gets dirty on the surface, it is consequently only necessary to clean the surface. As a result, the conveyor belt can be cleaned more effectively if the cleaning medium is slanted, with less cleaning medium entering the conveyor belt.

Tests have shown that particularly good cleaning results are achieved if the angle of incidence α is preferably between 15 ° and 75 °, particularly preferably between 30 ° and 60 °.

According to a development of the invention, it is provided that the at least one cleaning nozzle is stationary, in particular cannot be rotated. This feature considerably simplifies the design of the cleaning device according to the invention. On the one hand, this leads to a simpler structure, since there is no need for a complex movement mechanism, as a result of which the cleaning device can be produced at low cost. On the other hand, this considerably reduces the maintenance effort and the susceptibility to faults, in particular since the area in which the cleaning nozzle is arranged has a very strong tendency to become dirty.

The cleaning medium is braked after the impact on the surface of the conveyor belt. A part of the cleaning medium, typically 30% of the loaded cleaning medium, passes through the conveyor belt (if the structure is porous), another part remains in the conveyor belt (5%) and another part is thrown back by the conveyor belt. The part thrown back is at oblique angle of incidence α between 5 ° and 85 ° for the most part (more than 50%) as a fanned jet, depending on the angle of incidence α, the structure of the conveyor belt, the machine speed and the pressure of the emerging cleaning medium at an average angle y between 5 ° and 75 °, preferably reflected between 15 ° ± 10 ° against the running direction of the conveyor belt. The reflected jet entrains air, cleaning medium mist and dissolved impurities, which creates a suction effect in the direction of the reflected jet.

Since it is disadvantageous in the dryer section, for example, if cleaning medium remains in the conveyor belt (fabric), which leads to rewetting of the paper web that comes into contact with the circulating conveyor belt a little later, it is essential to clean the conveyor belt while the paper machine is in operation, the cleaning medium remove from the conveyor belt as effectively as possible. For this reason, the cleaning device usually has a suction channel with a suction opening for taking away the cleaning medium thrown back from the conveyor belt and mixed with dirt, into which the thrown back cleaning medium at least partially directly enters.

In order to be able to effectively collect the fanned out beam, which is at an average angle y from the conveyor belt against the running direction of the conveyor belt, i.e. is reflected on the side which is arranged opposite the cleaning nozzle in relation to the cleaning point, a particularly preferred embodiment of the invention provides that the suction opening extends at least in sections pointing in the direction of the cleaning point on the side opposite the cleaning nozzle in relation to the cleaning point is arranged, the central axis of the suction channel in the area of the suction opening with the conveyor belt forming an angle δ between 5 ° and 75 °.

The suction opening according to this embodiment points in the direction of the reflected beam, ie the suction opening faces the reflected beam. The Cleaning medium, which is reflected by the cleaning point against the direction of travel of the conveyor belt, can also be suctioned off more easily, since the suction opening extends at least in sections in the half-space of the reflected cleaning medium, facing the latter. Since the average reflection angle Y at the angles of incidence α specified above is usually in the range between 5 ° and 75 °, it is possible with the arrangement of the suction opening according to the invention to couple the reflected beam into the suction channel better than in the known embodiments in which the suction opening is not facing the reflected beam.

By increasing the suction power of the suction channel, the cleaning performance of the cleaning device can also be increased, since more cleaning medium can be used due to the increased suction power, the conveyor belt after cleaning and suction being just as dry as in known suction channel configurations with less use of cleaning medium.

The relative position between the suction opening and the at least one cleaning nozzle is preferably fixed.

Tests have shown that coupling the fanned out reflected cleaning medium into the suction channel is particularly possible if the angle δ is preferably between 5 ° and 50 °, particularly preferably between 5 ° and 25 °.

In order to be able to couple the reflected cleaning medium as effectively as possible into the suction channel, it makes sense if the reflected jet of cleaning medium, impurities and air / air boundary layers can get into the suction opening as directly as possible, i.e. without frequent changes in direction, e.g. due to wall reflections and the like. To further improve the coupling of the reflected cleaning medium into the suction opening and for lossless flow in the suction channel, it can therefore be useful if the central axis is in the Extends the area of the suction opening essentially in the extension of the cleaning medium reflected at the central angle y, that is, when the central axis in the area of the suction opening has the smallest possible parallel offset to the beam of the cleaning medium reflected at the central reflection angle y and when the central axis also has in the area of the suction opening the mean angle y includes the smallest possible angle. The parallel offset can usefully be at a maximum such that the portion of the beam reflected at the central angle y can still enter the suction opening directly. Accordingly, the following particularly preferred embodiments provide that the central axis of the suction channel in the area of the suction opening with the mean angle y includes the angle Σ in the range between ± 25 °, preferably between ± 15 °, very particularly preferably between ± 5 ° and / or

- the extension of the central axis of the suction channel in the area of the suction opening cuts the conveyor belt in the area of the cleaning point, i.e. no parallel offset between the central axis of the suction channel in the area of the suction opening and the portion of the jet of the cleaning medium reflected at the central angle y.

Furthermore, it makes sense if the widest possible angular range of the fanned out reflected beam of cleaning medium can be captured in the suction opening. A particularly preferred embodiment variant of the invention therefore provides that the cross-sectional area of the suction opening and the distance of the suction opening from the cleaning point are coordinated with one another in such a way that a cross-sectional area of the suction opening that is reflected at the mean angle y and in the opening angle range θ of ± 15 ° is preferred jet of cleaning medium fanned out by ± 25 ° can pass through the cross-sectional area of the suction opening.

To the proportion of the cleaning medium, which, for example, in the form of fog not as fanned out beam is reflected in the direction of the mean reflection angle Y, it makes sense if a suction space is formed in the running direction of the conveyor belt after the suction opening, which extends at least in sections in the direction of the at least one cleaning nozzle and has an opening that runs horizontally to the conveyor belt ,

Good suction performance is achieved when the horizontal opening to the conveyor belt is spaced between 1mm and 10mm, preferably between 3mm and 5mm.

In order to be able to suction off the entire cleaning medium which is designed as a mist and is not reflected in a directional manner, it makes sense if the suction space extends as far as at least one cleaning nozzle or if the suction space surrounds the at least one cleaning nozzle.

In order to guide the cleaning medium flowing in the suction channel as smoothly as possible in a laminar flow through the suction channel, it makes sense if the suction channel extends at least in sections straight and / or curved with a radius of curvature between 10 mm to 200 mm. Here the radius can change with the angle of the swept arc.

Furthermore, the suction channel can have a constant cross-sectional area at least in sections.

Tests have shown that particularly good suction performance can be achieved with a low degree of contamination of the suction channel if the suction channel has a cross-sectional area of 100qmm to lOOOOqmm, preferably from 500qmm to 3000qmm, especially lOOOqmm to 2000qmm.

The suction channel and / or the suction opening can also be round or have a square cross-section.

In order to be able to clean the conveyor belt at a larger width at the same time, it makes sense if a plurality of cleaning nozzles arranged next to one another transversely to the running direction of the conveyor belt are provided. In order to reliably clean the width of the conveyor belt, it also makes sense if the cleaning points overlap at least in sections.

In order to further guarantee that the entire width of the conveyor belt can be reliably cleaned, it makes sense if at least two of the cleaning nozzles are spaced differently from one another. It is further advantageous if the division of the scanning steps when traversing the cleaning device across is not equal to the division of the spacing of the cleaning nozzles.

In order to further ensure a good overlap of the cleaning points, it makes sense if at least two of the cleaning nozzles are not arranged parallel to one another. In order to increase the cleaning performance, they can be oriented in such a way that the rays of the cleaning medium emerging from the cleaning nozzles are focused on the cleaning point.

Cleaning nozzles with a round cross-section have proven their worth. It is therefore advantageous if at least one cleaning nozzle has a round cross section.

Cleaning nozzles with a diameter between 0.1 mm and 0.5 mm, preferably between 0.15 mm and 0.3 mm, are advantageous with regard to availability and water consumption.

In order to clean effectively, it makes sense if the cleaning medium has a pressure between 20 bar and 1000 bar, preferably between 200 bar and 500 bar, when it emerges from the cleaning nozzle. The cleaning medium has a liquid and / or gaseous component. Water with or without additives is often used as the cleaning medium.

In order to prevent local condensation, it makes sense if the temperature of the cleaning medium is adapted to the ambient temperature. Since, depending on the location, temperatures between 20 ° C. and 120 ° C., often between 50 ° C. and 100 ° C., prevail, a preferred embodiment of the invention provides that the cleaning medium preferably has a temperature between 20 ° C. and 120 ° C. between 50 ° C and 100 ° C.

In order to generate suction in the suction channel and thus further increase the suction power of the suction channel, a preferred development of the invention provides that the suction channel has a vacuum device after the suction opening in the direction of the reflected cleaning medium flowing in the suction channel.

There are different ways to create negative pressure in the suction channel. According to a further embodiment of the invention, the vacuum device has at least one injector nozzle for injecting an injection medium. As a result, a negative pressure in the manner of a water jet vacuum is generated by the suction effect of the air layers accelerated with the injection medium, so that dirt particles, mist and drops of cleaning medium are entrained in the direction of the outlet opening. Another advantage of injecting the injection medium is that the suction channel is permanently flushed, which can reduce or prevent dirt deposits in the suction channel.

Since an additional substance is introduced into the suction channel when an injector medium is injected, the cross section of the suction channel in the region of the at least one injector nozzle must widen in the direction of the cleaning medium flowing in the suction channel in order to avoid backflow. In order to further increase the suction power of the suction channel, it makes sense if several injector nozzles are arranged one behind the other in the direction of the cleaning medium flowing in the suction channel / drain line, the injection medium which emerges from the injector nozzle (s) arranged at the front in the flow direction with a higher one Pressure is applied as that from the injector nozzle (s) behind it.

In order to ensure a high suction power in the suction channel, the flow has to be laminar as little as possible. The at least one injector nozzle is therefore advantageously arranged in such a way that the injection medium is injected at least in sections parallel to the central axis of the discharge channel.

Experiments have shown that in order to generate a satisfactory negative pressure, the injection medium which emerges from the injector nozzle, which is arranged in the direction of flow, has a pressure between 20bar and 1000bar, preferably between 200bar and 500bar, and when the injector medium. , which emerges from the injector nozzle behind it in the direction of flow, has a pressure between 20bar and 40bar at the outlet.

It is advantageous if at least one injector nozzle has a round or oval or rectangular cross section and its diameter is in the range between 0.1 mm and 0.5 mm, preferably between 0.15 mm and 0.3 mm. The injector nozzle behind it preferably has a 1 mm and 2 mm, preferably 1.5 mm.

Furthermore, the injector medium can have a liquid and / or gaseous component.

According to further preferred embodiments, the injector medium is warmed or cooled with respect to the ambient temperature. Heating prevents condensation in the suction channel. Furthermore, rinsing can be carried out more effectively. The injector medium has a temperature between 30 ° C and 100 ° C, preferably between 30 ° C and 70 ° C.

A reduction in pressure is generated locally by cooling, whereby an improved suction power in the suction channel can be achieved. The injector medium has a temperature between 4 ° C and 50 ° C, preferably between 8 ° C and 25 ° C.

Advantageously, at least one air knife is arranged in the running direction of the conveyor belt after the at least one cleaning nozzle, by means of which compressed air can be applied to the conveyor belt, which strikes the conveyor belt at an angle β between 10 ° and 80 °, preferably between 50 ° and 70 ° in the running direction , The air knife can be used to blow off and / or atomize residues of the cleaning medium that are on the surface or in the conveyor belt. In addition, entry of false air into the area of the cleaning nozzles can be prevented.

It is both conceivable that the air knife at least in sections forms a plurality of individual jets which are arranged next to one another transversely to the running direction of the conveyor belt and / or that the air knife at least in sections forms a slit-like air curtain extending transversely to the running direction of the conveyor belt.

Tests have shown that the air knife fulfills its tasks particularly well when the compressed air has a pressure between 1 bar and 10 bar, preferably between 4 bar and 7 bar.

The compressed air is advantageously heated to a temperature between 20 ° C. and 200 ° C., preferably between 50 ° C. and 200 ° C. If the compressed air heated above ambient temperature is blown onto / into the conveyor belt, the conveyor belt is actively dried. The invention is explained below using an advantageous exemplary embodiment and the following drawings. Show it:

1 shows a device according to the invention for cleaning a conveyor belt in longitudinal section,

FIG. 2 shows a cleaning head according to the invention in a frontal view,

Figure 3 shows the cleaning device according to the invention in an arrangement for the paper machine.

FIG. 1 shows a cleaning device 1 according to the invention for cleaning a conveyor belt 2 of a web processing machine. The cleaning device 1 has a plurality of cleaning nozzles 3 arranged in a cleaning head 18, of which only one can be seen in the present illustration. A cleaning medium 4 can be applied to the conveyor belt 2 at the cleaning point 5 by the cleaning nozzles 3. The cleaning nozzles 3 are arranged in such a way that the cleaning medium 4, as a jet 7, is always inclined against the running direction 6 of the conveyor belt 2 at an angle of incidence α between 5 ° and 85 ° at the cleaning point 5 at the conveyor belt 2.

In the present illustration, the incident beam 7 includes an angle of incidence α of 45 ° with the transport path 2. Tests have shown that generally very satisfactory cleaning results are achieved if the angle of incidence α is preferably between 15 ° and 75 °, particularly preferably between 30 ° and 50 °.

The cleaning nozzles 3 are fixed in relation to the conveyor belt 2, in particular they cannot be rotated. Arranged in relation to the cleaning point 5 opposite the cleaning nozzles 3, the device 1 for cleaning the conveyor belt 2 has a suction channel 8 with a suction opening 9. The suction channel 8 has a central axis 10. Through the suction opening 9, cleaning medium 4 mixed with dirt enters the suction channel 8 after it is thrown back by the conveyor belt 2. A large part of the cleaning medium 4 thrown back by the conveyor belt is reflected as a fanned beam 11 at an average angle Y by the conveyor belt 2 against the running direction 6 of the conveyor belt 2. The suction opening 9 extends on the side which is arranged opposite the cleaning nozzles 3 in relation to the cleaning point 5. According to the invention, the suction opening 9 points in the direction of the cleaning point 5 and thus in the direction of the reflected beam 11. According to the invention, the central axis 10 of the suction channel 8 in the area of the suction opening 9 includes an angle δ between 5 ° and 75 ° with the conveyor belt 2. In the present exemplary embodiment, the central axis 10 of the suction channel 8 extends in the area of the suction opening 9 in extension to the beam 11 reflected at the average angle γ = 15 °. That is, the angle δ is δ = 15 °, which means that the central axis 10 of the suction channel 8 includes the angle Σ = 0 ° in the area of the suction opening 9 with the mean angle y and that the extension of the central axis 10 of the suction channel 8 in the area of the suction opening 9 cuts the conveyor belt 2 in the area of the cleaning point 5.

As can be seen from FIG. 1, the cross-sectional area 27 of the suction opening 9 and the distance A between the cross-sectional area 27 and the cleaning point 5 are coordinated with one another such that a cross-section area 27 of the suction opening 9 reflects and im Opening angle range θ ± 25 ° fanned beam of the cleaning medium can pass through the cross-sectional area 27 of the suction opening 9. Furthermore, a suction chamber 12 is formed in the running direction 6 of the conveyor belt 2 after the suction opening 9. In the present exemplary embodiment, the suction space 12 extends in the direction of the cleaning nozzles 3 and surrounds them. The suction chamber 12 has an opening 13 which runs horizontally to the conveyor belt 2 and is spaced from the conveyor belt 2 between 1 mm and 10 mm, preferably between 3 mm and 5 mm.

The suction channel 8 is first curved in the direction of flow of the reflected beam 11 with a radius of curvature 100 mm and then extends straight, whereby the suction channel 8 takes the form of a "shoe".

In the direction of the reflected beam 11 or the cleaning medium 4 flowing through the suction channel, the suction channel 8 after the suction opening 9 has a vacuum device in the form of one or more injector nozzles 16 for injecting an injection medium 17. A section 14 of the suction channel 8, which extends between the suction opening 9 and the injector nozzle 16, has a constant cross-sectional area.

The section 15 of the suction channel 8 adjoining the section 14 extends straight. The cross section of the suction channel in the area 15 widens starting from the injector nozzle 16 in the direction of the cleaning medium 4 flowing in the suction channel 8. The injector nozzle 16 is arranged in such a way that the injection medium 17 is injected at least in sections parallel to the central axis 10 of the discharge channel 8 in the area 15.

Cross-sectional areas of the suction channel 8 in the ranges from 100 mm to 100 mm, preferably from 500 mm to 3000 mm, particularly from 100 mm to 2000 mm are advantageous.

The suction channel and / or the suction opening can have a round or square cross section. - 1δ

The injection medium 17 has a pressure between 20 bar and 100 bar, preferably between 200 bar and δOO bar, when it emerges from the injector nozzle. Furthermore, the injector nozzle 16 can have a round or oval or rectangular cross section. The injector nozzle 16 preferably has a diameter δ between 0.1 mm and O. δ mm, preferably between 0.1 δ mm and 0.3 mm. The injector medium can have a liquid and / or gaseous component and is water in the present exemplary embodiment. In order to increase the suction effect and thus the suction power due to local pressure reduction in the suction channel 8, in the present exemplary embodiment the injector medium 17 has cooled with respect to the ambient temperature and has a temperature of 8 ° C.

In the running direction 6 of the conveyor belt 2 after the cleaning nozzles 3, an air knife 19 is arranged, through which the conveyor belt 2 can be pressurized with compressed air 20, which is at an angle β between 10 ° and 80 °, preferably between 60 ° and 70 ° in the running direction 6 Conveyor belt 2 hits. δ The air knife 19 can be formed at least in sections by a plurality of individual jets which are arranged next to one another transversely to the running direction 6 of the conveyor belt 2 and / or at least in sections by a slit-like air curtain extending transversely to the running direction 6 of the conveyor belt 2. 0 In the present exemplary embodiment, the compressed air has a pressure of δbar. In order to actively dry the conveyor belt 2, which is still wet after cleaning, the compressed air 20 is heated to a temperature of 170 ° C. above ambient temperature. FIG. 2a (section line aa in FIG. 1) shows the cleaning head 18 in a front view with a view of the cleaning nozzles 3, 3 ^' , 3 ^" and 3 ^'" . As can be seen from the illustration, the cleaning nozzles 3, 3 ^' , 3 ^" and 3'" are arranged side by side, the cleaning head 18 being aligned such that the δ cleaning nozzles 3, 3 ^' , 3 ^" and 3 ^'" extend side by side transversely to the direction of travel 6 of the conveyor belt 2. Furthermore, it can be seen that all the cleaning nozzles 3, 3 ^' , 3 ^" and 3 ^'" are spaced differently from one another (D3 <D1 <D2). Furthermore, the cleaning nozzles 3, 3 ', 3 ^" and 3'^" are inclined relative to one another with respect to the vertical 28 by the angles ξ1, ξ2, ξ3 and ξ4 such that the cleaning nozzles 3, 3 ^' , 3 "and 3 ^' "emerging rays 7, 7 ', 7" and 7 ^'" can be focused at the cleaning point (see FIG. 2b; section line bb in FIG.

In the present exemplary embodiment, the cleaning nozzles 3, 3 ', 3 "and 3'" have a round cross section with a diameter of 0.2 mm. The cleaning medium 4 emerging from the δ cleaning nozzles has a pressure of 30 bar when it emerges from the cleaning nozzles 3, 3 ^' , 3 ^" and 3 ^'" . Water is used as the cleaning medium 4. To prevent condensation of the cleaning medium, it is heated to 100 ° C above room temperature.

FIG. 3 shows a view of the cleaning device 1 in combination with a machine for paper production 2δ. The cleaning device 1 is connected to a movement unit 21, which makes it possible to move the cleaning device transversely (CD) to the running direction 6 of the transport path 2. An outflow line 23 is arranged in the flow direction of the cleaning medium 4 carried away after the movement unit 21, through which the cleaning medium is guided further away. Flow accelerators 22 in the form of injector nozzles 22 are arranged in the discharge line 23. The injector nozzles 22 have a nozzle diameter between 1mm and 2mm, preferably 1, δmm. The pressure of the injector medium as it emerges from the injector nozzles 22 is in the range from 20 bar to 40 bar. The system thus has a plurality of injector nozzles 16 and 22 arranged one behind the other in the flow direction of the cleaning medium 4 to be removed. In this case, the injector medium 26 injected by the injector nozzles 22 is subjected to a lower pressure than the injector medium 17.

Claims

claims

1. Device for cleaning a conveyor belt of a web processing machine, with at least one cleaning nozzle through which the conveyor belt can be acted upon by a cleaning medium, so that the at least one cleaning nozzle is arranged in such a way that the Cleaning medium as a jet always inclined against the running direction of the conveyor belt at an angle of incidence α between δ ° and 8δ ° meets the conveyor belt at a cleaning point. δ 2. Device for cleaning a conveyor belt according to claim 1, d ad u rc h ge k n nze i ch n et that the angle of incidence α is preferably between 1δ ° and 7δ °, particularly preferably between 30 ° and 60 °.

3. Apparatus for cleaning a conveyor belt according to claim 1 or 2.0, so that the at least one cleaning nozzle is stationary, in particular cannot be rotated.

528)

4. Device for cleaning a conveyor belt according to one of the preceding claims, that the device has a suction channel with a suction opening into which the cleaning medium mixed with δ dirt enters after being thrown back by the conveyor belt , wherein the suction opening extends at least in sections on the side which is arranged opposite the cleaning point with respect to the cleaning point, the suction opening pointing in the direction of the cleaning point, and wherein the central axis of the suction channel in the area of the suction opening forms an angle δ with the conveyor belt Includes 5 ° and 7δ °. δ. Device for cleaning a conveyor belt according to claim 4, so that the angle δ is preferably between 10 ° and 60 °, particularly preferably δ between 1δ ° and 3δ °.

6. Device for cleaning a conveyor belt according to one of the preceding claims, so that a large part of the cleaning medium thrown back from the conveyor belt is reflected at an average angle Y, the central axis of the suction channel being in the region of the Suction opening extends essentially in an extension of the central angle Y.

7. Device for cleaning a conveyor belt according to one of the preceding claims, δ d ad u rch ge ke n nze i ch net that the central axis of the suction channel in the area of the suction opening with the average angle Y the angle Σ in the range between ± 2δ °, preferably includes ± 1δ °, particularly preferably ± δ °.

8. A device for cleaning a conveyor belt according to one of the preceding claims, so that the cleaning medium meets the transport path δ at a cleaning point and that the extension of the central axis of the suction channel in the area of the suction opening the conveyor belt in Area of the cleaning point.

9. Device for cleaning a conveyor belt according to one of the preceding claims, 0 d ad u rc h ge ke n nze i ch n et that the cross-sectional area of the suction opening and the distance of the suction opening to the cleaning point are matched to one another such that by the cross-sectional area of the Suction opening, a beam of the cleaning medium reflected at the central angle Y and fanned out in the opening angle range θ of ± 15 °, preferably of ± 25 ° δ, can pass through the cross-sectional area of the suction opening.

10. Device for cleaning a conveyor belt according to one of the preceding claims, that a suction space is formed in the running direction of the conveyor belt after the suction opening, which at least in sections in the direction of the at least one cleaning nozzle extends and has an opening that runs horizontally to the conveyor belt.

11. Device for cleaning a conveyor belt according to one of the δ preceding claims, d ad u rc h ge ken nze i ch n et that the opening to the conveyor belt is spaced between 1mm and 10mm, preferably between 3mm and δmm.

12. Device for cleaning a conveyor belt according to one of the preceding claims, d ad urch geken nzei chn et that the suction space extends to at least one cleaning nozzle.

δ 13. Device for cleaning a conveyor belt according to one of the preceding claims, d ad u rc h ge k n nze i ch n et that the suction chamber surrounds the at least one cleaning nozzle.

14. Device for cleaning a conveyor belt according to one of the preceding claims, characterized by the fact that the suction channel extends at least in sections straight and / or curved with a radius of curvature between 10 to 200 mm.

1δ. Device for cleaning a conveyor belt according to one of the δ preceding claims, characterized in that the suction channel has a constant cross-sectional area at least in sections.

16. A device for cleaning a conveyor belt according to one of the 0 preceding claims, characterized by the fact that the suction channel has a cross-sectional area of 100qmm to 10000qmm, preferably from δOOqmm to 3000qmm, particularly from 10000mm to 2000qmm.

17. A device for cleaning a conveyor belt according to one of the preceding claims, d ad u rc h ge ken nze i ch n et that the suction channel and / or the suction opening has a round or square δ cross section.

18. Device for cleaning a conveyor belt according to one of the preceding claims, that a plurality of cleaning nozzles arranged next to one another transversely to the running direction of the conveyor belt are provided.

19. A device for cleaning a conveyor belt according to one of the preceding claims, so that at least two of the cleaning nozzles are spaced differently from one another δ.

20. Device for cleaning a conveyor belt according to one of the preceding claims, that it means that at least two of the cleaning nozzles are not arranged parallel to one another.

21. A device for cleaning a conveyor belt according to one of the preceding claims, d ad u rc h ge ke n nze i ch n et that at least one cleaning nozzle has a round cross-section.

22. Device for cleaning a conveyor belt according to one of the preceding claims, so that the cleaning nozzles have a diameter between 0.1 mm and 0, δ mm, δ preferably between 0.1 δ mm and 0, 3mm.

23. Device for cleaning a conveyor belt according to one of the preceding claims, d ad u rch ge ke n nze i ch n et that the cleaning medium at the outlet from the cleaning nozzle has a 0 pressure between 20bar and 10OObar, preferably between 200bar and δOObar.

24. A device for cleaning a conveyor belt according to one of the preceding claims, that the cleaning medium has a liquid and / or gaseous component.

2δ. Device for cleaning a conveyor belt according to one of the preceding claims, characterized by the fact that the cleaning medium has a temperature of more than 20 ° C to 120 ° C, preferably between 60 ° C and 100 ° C.

26. Device for cleaning a conveyor belt according to one of the preceding claims, d ad u rc h ge ke n nze i ch n et, δ that in the direction of the reflected / flowing in the suction channel cleaning medium after the suction opening of the suction channel has a vacuum device.

27. Device for cleaning a conveyor belt according to one of the preceding claims, so that the vacuum device has at least one injector nozzle for injecting a δ injection medium.

28. Device for cleaning a conveyor belt according to one of the preceding claims, so that the cross section of the suction channel widens in the area of the at least one injector nozzle, starting in the direction of the cleaning medium flowing in the suction channel.

29. Device for cleaning a conveyor belt according to one of the preceding claims, d ad u rc hge ken nze i ch n et, δ that in the direction of the cleaning medium flowing in the suction channel, several injector nozzles are arranged one behind the other and that the injection medium, which comes from the / the In the flow direction at the front, the injector nozzle (s) exits at a higher pressure than that from the injector nozzle (s) behind it. 30. Device for cleaning a conveyor belt according to one of the preceding claims, so that the at least one injector nozzle is arranged in such a way that the injection medium is injected at least in sections parallel to the central axis of the discharge channel. -26

31. Device for cleaning a conveyor belt according to one of the preceding claims, so that the injection medium has a pressure δ between 20bar and 1000bar, preferably between 200bar and δOObar, when it emerges from the injector nozzle.

32. Apparatus for cleaning a conveyor belt according to one of the preceding claims, that it ad ge rc h ge k n nze i ch n et that at least one injector nozzle has a round or oval or rectangular 0 cross-section.

33. Device for cleaning a conveyor belt according to one of the preceding claims, d ad u rc h ge k n nze i ch n et that the injector nozzle has a diameter between 0.1mm and O.δmm, δ preferably between 0.1 δmm and 0, 3mm.

34. Device for cleaning a conveyor belt according to one of the preceding claims, d ad u rc h ge ke n nze i ch n et that the injector medium has a liquid and / or gaseous component. 35. Device for cleaning a conveyor belt according to one of the preceding claims, which means that the injector medium is warmed or cooled with respect to the ambient temperature.

36. Device for cleaning a conveyor belt according to one of the preceding claims, d ad u rc h ge ke n nze i ch n et that the injector medium a temperature between 30 ° C and 100 ° C, preferably between 30 ° C and 70 ° C. or between 4 ° C and δO ° C, preferably between 8 ° C and 2δ ° C.

37. Device for cleaning a conveyor belt according to one of the preceding claims, ad ad rc hge ke n nze i ch n et that in the running direction of the conveyor belt after the at least one cleaning nozzle at least one air knife is arranged, through which the conveyor belt can be acted upon with compressed air , which meets the conveyor belt at an angle β between 10 ° and 80 °, preferably between 50 ° and 70 ° in the running direction.

38. Device for cleaning a conveyor belt according to one of the preceding claims, that the air knife at least in sections forms a plurality of individual jets which are arranged next to one another transversely to the direction of travel of the conveyor belt and / or that the air knife at least sectionally forms a slit-like air curtain extending transversely to the running direction of the conveyor belt.

39. Device for cleaning a conveyor belt according to one of the preceding claims, d ad u rc h ge ken nze i ch n et that the compressed air has a pressure between 1 bar and 10bar, preferably between 4bar and 7bar.

40. Device for cleaning a conveyor belt according to one of the preceding claims, d ad u rc h ge ken n ze i ch n et that the compressed air to a temperature between 20 ° C and 200 ° C, preferably δ between δO ° C and 200 ° C is warmed.

41. Method for cleaning a moving conveyor belt of a web-processing machine, so that the cleaning medium as a jet is always inclined against the running direction of the conveyor belt at an angle of incidence α between δ ° and 86 ° at a cleaning point strikes the conveyor belt and that a suction opening of a suction channel is arranged in such a way that the portion of cleaning medium reflected by the conveyor belt at an average angle γ = 1δ ° ± 10 ° and in the opening angle range θ of ± 1 δ ° reflected against the running direction of the conveyor belt through the cross-sectional area the suction opening occurs.