EP1422338A2 - Apparatus and process for cleaning a web of material - Google Patents

Abstract

A papermaking assembly has a dewatering belt which passes through a cleaning station with an array of water jets. The jets are held together in a group which moves back and forth along a guide. Two or more of the jets describe an angle alpha with respect to each other. The jets impinge on the web surface at different angles of presentation. Water is pre-heated before delivery to the jets. The cleaning station is located within a spray booth or cabin with a supply of compressed air. The regular array of jets are arranged in lines which are transposed with respect to each other. One or more of the jets is a rotating unit. The array of jets is free to move over a width which is greater than that of the web. The jets are located within a compartment with a non-contact or low-contact seal.

Description

The invention relates on the one hand to a device for cleaning a material web with nozzles for generating a liquid jet, in which the Nozzles are combined to form at least one composite nozzle and the Nozzle assembly in the direction of an axis of rotation of a material web guide is displaceably arranged.

On the other hand, the invention relates to a method for cleaning a material web with liquid jets emerging from nozzles.

In addition, the invention relates to the use of the invention Contraption.

Such devices and methods are from the prior art known. For example, in utility model G 92 08 909 U1 Device for cleaning a circulating fabric web in a paper machine described in which a needle jet spray nozzle water against the fabric web is spraying and the needle jet spray nozzle meanwhile is moved transversely to the fabric web on a traversing device. additionally the needle jet nozzle leads to the transverse movement of the needle jet nozzle a circular movement around an axis of rotation.

In addition, European patent application EP 0 731 211 A1 described a beam device for cleaning a conveyor belt a machine for producing a material web, in particular a paper or cardboard web. In this setup, a nozzle head is one Nozzle device rotatably mounted. By means of a circular movement A jet of liquid can be directed onto the fabric web, so that the liquid jet next to a traversing relative movement compared to the circumferential fabric web also one circular relative movement with respect to the fabric web.

A similar device is also in the international application WO 97/42373 described in which a liquid jet is generated Nozzles are rotating on an infeed device. The nozzles are combined one behind the other into a row of nozzles, which has between three and six nozzles, so that the so summarized Nozzles transverse to the direction of travel of the material web Spray a much wider longitudinal stripe of the material web while doing so clean as is the case with a single nozzle.

Because of the movable nozzles of the known devices Cleaning results of soiled fabric or conveyor belts improved However, there is still a need for cleaning intensity regarding dirty fabric and conveyor belts to increase and thereby the effectiveness of cleaning tissue and Conveyor belts continue to improve.

The invention is therefore based on the object of generic cleaning devices to develop in such a way that the cleaning quality elevated.

The object of the invention is achieved by a device for cleaning a Material web with nozzles for generating a liquid jet solved, at which combines the nozzles into at least one nozzle assembly are and the nozzle assembly in the direction of an axis of rotation of a material web guide is displaceably arranged and at least two nozzles in one Angle α are arranged to each other.

Advantageously, by such an arrangement of the nozzles, the liquid jets emerging from them in different directions onto the material web so that individual liquid jets are independent of each other with, against or transversely to the running direction of the material web on this to meet. This advantageously results in dirt on the material web sprayed with liquid jets from different angles, so that even stubborn dirt sticks to the material web be solved more effectively than before.

In addition, the liquid jets do not just hit along as before a line on the material web or in the case of a rotating nozzle a narrow one transverse to the direction of movement of the material web Stripes on the material web. Rather, the liquid jets hit also spaced further apart in the running direction of the material web the material web so that the arrangement of the invention Nozzles a much wider area of the material web with liquid jets is applied and thereby an increase in cleaning intensity the device is reached.

The angle α between the at least two nozzles can, on the one hand have a fixed value. On the other hand, it is also possible that this Angle α is variable by the at least two nozzles in their Allow adjustment to each other so that the angle α is different is adjustable. The angle α can then depend on the type of material web and / or individually adjusted depending on the type of contamination.

Because with material webs with different structures with one or other cleaning method better or worse cleaning results can be achieved, the inventive arrangement of the nozzles contributes significantly to this in that the device according to the invention not only for use a certain material web is determined, but the invention Rather, the device is very diverse on different material webs can be used.

The term "material web" broadly includes any facility that circulate and pollute in the course of their use. For example these are conveyor belts, which are carried by substances on them become dirty.

In particular, in the sense of the invention, the material webs are permeable Sheets with a woven structure. But also so-called "nonwooven" tapes are recorded with the term "material web". For this count in particular felt-like or fleece-like tapes. Even tapes that are made a perforated sheet metal strip are in the present case with the The term "material web" recorded.

For the purposes of the invention, the term “nozzle assembly” is understood to mean the Combination of several individual nozzles, usually a common one Subject to control. For example, the individual nozzles become common move in one direction or swiveled. But also individual nozzles, whose movements are different from each other, can lead to one Nozzle assembly can be summarized.

Such a composite nozzle can face the material web in the region of it Side be convex. This allows the nozzles on the Arrange the peripheral surface of a cylinder. In addition, it is also possible, a nozzle composite in the area of its facing the material web Side concave, so that those emerging from the individual nozzles Liquid jets in different orientations towards the hit cleaning material web. Advantageously, the concave shape Area where the nozzles are arranged, if necessary simultaneously a kind of nozzle cabin that at least covers the area of the material web covers that of the various individuals emerging from the nozzles Filling rays is attacked. This is structurally particularly simple created a separate spray room within the cleaning device. It is advantageous if the individual nozzles or a composite nozzle at least between cleaning a web of material in position are adjustable. A setting of a single nozzle or a combination of nozzles can be done manually or, if necessary, automatically by means of appropriate Adjustment mechanisms are made.

In the present context, the term "material web guidance" means preferably a device rotating about an axis of rotation, which redirects and guides a circulating web of material. easy Examples of a material web guide are rollers or cylindrical ones Rollers that deflect the material web in a different direction. It it goes without saying that such material web guides can also be rigid. However, higher wear of the material web is to be expected here, because it slips over the surface of the web guide. In the Such material web guides are generally approximately transverse to a circumferential one Material web arranged.

In addition, the object of the invention is on the one hand of a device for cleaning a material web with nozzles for generating a Liquid jet solved, in which the nozzles to at least one nozzle assembly are summarized and the nozzle network in the direction of a Rotation axis of a material web guide is arranged displaceably, wherein several nozzles of the nozzle network on one surface both side by side and are arranged one behind the other.

Here, the nozzles are not only next to each other across the material web but additionally arranged one behind the other in the running direction of the material web. This is the first time that a nozzle assembly has been created that not only runs along has a line of nozzles, but in which the nozzles on a surface are distributed.

Accordingly, one understands a nozzle arrangement on a surface any array of nozzles along a nozzle array a line are different.

For example, the nozzles of the nozzle array are arranged on a circular line, so that a much larger material web area at the same time Liquid jets is sprayed.

The cleaning intensity of known cleaning devices thus becomes cumulative or alternatively to those arranged at an angle α to each other Nozzles increased.

The cleaning intensity is also reduced by such a nozzle arrangement the cleaning device increases, so that here too the material web is cleaned much more effectively than with conventional cleaning devices the case is.

It is known from the prior art to arrange nozzles next to one another. However, the nozzles are only along a straight line arranged to a row of nozzles and the row of nozzles extends transversely to Direction of the material web.

On the other hand, the object of the invention is from a device for Cleaning a web of material with nozzles to generate a jet of liquid solved, in which the nozzles to at least one nozzle assembly are summarized and the nozzle assembly in the direction of an axis of rotation a material web guide is arranged displaceably and the device has a heating device with which the liquid of the liquid jet is warmed up.

Here is the liquid from which the liquid jet generates is preferably essentially water, since this is relatively inexpensive and is available in larger quantities.

By means of the heated liquid, the cleaning intensity of a device for cleaning a material web also increased because it has been shown that most pollution with a heated liquid can be released more quickly from a material web.

It has also been found to have a good improvement in cleaning performance is already present at temperatures above 30 ° C. To the To further increase cleaning effectiveness, it is advantageous if a liquid the liquid jet a temperature between 50 ° C and 90 ° C, preferably between 60 ° C and 80 ° C. A very good relationship between cleaning effect and use of energy to heat the liquid is at a preheating temperature of approx. 70 ° C.

In the present context, the term “heating device” is understood a device which is intended to place a liquid on a heat the temperature levels described.

Around the cleaning area of the cleaning device spatially from surrounding Areas of the cleaning device are particularly easy to construct separate, it is advantageous if at least individual nozzles or the nozzle assembly arranged within a spray room or within a nozzle booth is.

The spray room or the nozzle booth is particularly good from a residual liquid and loosened dirt particles when cleaned at a spray room or a compressed air supply is arranged on a nozzle cabin. through this compressed air supply becomes an overpressure in the spray chamber or in the nozzle cabin provided and due to the overpressure Residual liquid and dirt particles particularly thoroughly from the spray room or pressed out of the nozzle cabin. The excess pressure in the compressed air supply and in the spray chamber or the nozzle chamber can by means of different Facilities are provided. The has proven to be advantageous Use of a blower exposed either on the compressed air supply or arranged directly on the spray room or on the nozzle cabin is.

A preferred embodiment variant provides that the nozzle assembly at least two rows of nozzles offset from one another, preferably in shape of pairs of nozzles. To clean a large area To obtain material web, for example, two pairs of nozzles arranged to each other, so that not only with respect to a material web several pairs of nozzles next to each other transversely to the direction of travel of the material web, but also at least two pairs of nozzles in a row in the running direction the material web are arranged. If necessary, at least some of the Nozzles of the two rows of nozzles offset from one another in such a manner but releasably in arranged at an angle to each other that liquid jets emerging from the nozzles hit the material web from different directions. There is thus the possibility of contamination of the material web to attack from different directions and therefore particularly intimately soiling associated with the material web more effectively from the Material web to solve. Not about the area of application of the nozzle assembly only towards a single specific angle setting with respect to the nozzles restrict, it is advantageous if the position of the nozzles is adjustable, so that on the one hand the nozzles to each other as well as to the material web can be arranged in a versatile orientation. in this connection it is possible to use a manual or an automatic nozzle Adjustment mechanism to be provided.

In addition, it is advantageous if at least one composite nozzle is approximately arranged displaceable transversely to the axis of rotation of the material web guide is. This makes it possible not to use the nozzles of a composite nozzle only in the direction of the axis of rotation but also in the direction of travel of the material web to move or relocate.

Under a displacement transverse to the axis of rotation of the web guide one understands a shift of the nozzle assembly, which is not in the direction of the Rotation axis of the material web guide is made. As a result, such shifts are made in a direction that one Have angles to the axis of rotation of the web guide or skew to the axis of rotation of the web guide.

Due to the possibility of closing the nozzles in the running direction of the material web the jets of liquid cannot move to just one area the material web are aligned with a material web guide is in direct contact. Rather, it is now possible to use liquid jets to direct the nozzles to areas of the material web where the material web is not directly in with a material web guide Contact is there. This allows dirt particles to pass through the web guide surface better get through.

In this context, it is advantageous if at least one composite nozzle arranged pivotably about an axis of rotation of a material web guide is. This enables the nozzle assembly in the area of a material web guide movable on a circular path around the axis of rotation of a Material web guidance and thus also in the direction of travel of a material web is arranged movably. It is understood that the radius of the Circular path on which the nozzle assembly is pivoted, both changeable can also be set constant.

To clean a web of material using a variety of liquid jets and thus to get rid of dirt quickly and particularly well, it is advantageous if at least one nozzle assembly is more than three, preferably has more than six, nozzles. It has been shown that very good cleaning performance with two pairs of nozzles per nozzle group will achieve.

A further increase in cleaning intensity is achieved if at least a nozzle has means for rotating and / or means for rotating. This gives the possibility of a liquid jet over the movements previously explained in relation to a rotating one To modulate the web of material.

If, in addition, at least one nozzle has means for pivoting, the cleaning intensity can also be increased. Preferably swivel the nozzles in the direction of travel of the material web and forth. But also swiveling transversely to the direction of travel of the material web is advantageous in this context.

Furthermore, it is advantageous if at least one nozzle has at least at its outlet opening a nozzle channel cross section of more than 0.3 mm ² , preferably more than 0.6 mm ² . A nozzle with an outlet cross section selected in this way enables a sufficiently wide jet of liquid to be sprayed onto the material web.

However, to also keep the fluid consumption in an economically justifiable To keep dimensions, it is important to ensure that the cross section of a nozzle duct is not chosen too large.

Accordingly, it is advantageous if at least one nozzle has a nozzle channel cross section of less than 1.5 mm ² , preferably less than 1 mm ² , at least at its outlet opening. It goes without saying that the nozzle or the nozzle channel cross section can be selected as a function of the nature of the material web or of the type of soiling.

A further advantageous embodiment variant provides that the device has a traverse, on which nozzles transverse to the direction of the Material web are moved and the traverse wider than the material web is.

Since both individual nozzles and the nozzle assembly in the course of cleaning the material web is slightly contaminated by loosened soiling can be or can be contaminated, it is advantageous if the Nozzles or the nozzle assembly are cleaned from time to time. As a result, the cleaning quality of the entire cleaning device significantly improved.

Such a maintenance area is usually located on the left and / or to the right of the material web and is preferably as an extension a traverse designed, on which a composite nozzle transverse to the direction the material web is moved. This is advantageous because of a composite nozzle this is particularly simple in terms of construction from the cleaning area of a material web can be moved out into a maintenance area. In the maintenance area is in the area of the nozzles, especially in front of the nozzles, arranged a washing device with which the Nozzles of the nozzle network are washed or cleaned.

The term "cleaning area" means an area of the material web, which is preferably arranged between two material web guides and is reached by cleaning nozzles.

It has also been found that it is advantageous if the device has at least one sealing device opposite a spray chamber seals the web of material and adjustable relative to the web of material is arranged.

The sealing device can move close to the material web , whereby the area in which the nozzles are arranged of surrounding areas of the device is largely separated. hereby can be caused by the liquid jets hitting the material web conditional fog particularly effective from other device areas be kept away.

The term "spray room" is understood in the sense of the invention the area adjacent to the surrounding material web, the area opposite Assemblies of the device is largely separated. In this Spray room are the nozzles, which each have a liquid jet on the Project material web, arranged. Especially when the Liquid jets create a liquid mist on the surface of the material web from the finest drops. This fog as well as parts of redirected Liquid jets and splashing pollution particles retained in the spray room, collected and then disposed of or processed. The spray room thus provides a kind of nozzle booth which preferably surround the area of the material web surface Component groups or facilities of the cleaning device spatially demarcates. About a residual amount of liquid and splashing dirt particles structurally from the spray room or from the nozzle cabin it is particularly easy to lead out, it is possible to spray the or Nozzle cabin inside either with a vacuum or with a To apply overpressure. In the variant in which a vacuum in is present in the spray chamber, the residual liquid or the dirt particles sucked out of the area of the spray room or the nozzle cabin. Thus, the cleaning process of the web surface is not due to excess liquid or splashing dirt particles with special needs. Another possibility, the residual liquid or splashing dirt particles from the area of the spray room to lead, consists of one in the spray room or in the nozzle booth To provide overpressure. By means of this overpressure, the residual liquid and splashing dirt particles are also very good led out of the area of the spray room or the nozzle cabin. On An additional advantage is the fact that a so-called "Air knife" can be created, which on the one hand Area of the spray room or the nozzle booth from a surrounding area can also separate so that it is ensured that the residual liquid and the separated dirt particles with the intended ones Devices from the spray room or from the nozzle cabin be brought out.

But especially in areas in which components move relative to each other, sealing is particularly complex, since a sealing device is very difficult Precise and therefore complex must be produced in order to achieve good sealing results to achieve.

In the present case around the spray area in the area of the surrounding material web to seal effectively, it is particularly advantageous if the sealing device Has sealing lips that are non-contact or at least low-contact correspond with the material web.

So that the spray area is particularly well sealed, it is advantageous if the sealing device is as close as possible to the surrounding material web is approached. The sealing device is set so that its Sealing lips generally do not or hardly touch the material web, however it may happen that the material web with the Sealing lips of the sealing device comes into contact. To the material web in not to damage such cases, it is advantageous if between the Sealing device and the material web sealing lips are arranged, the are preferably made of a softer material than the material web.

Cumulatively or alternatively to the adjustable sealing device, it is advantageous if the sealing lips are arranged adjustable relative to the material web are. Because the sealing lips ultimately come in close contact with the circumferential one Material web can stand by means of opposite the material web adjustable sealing lips, a structurally particularly simple and effective sealing of the spray chamber can be achieved.

A correspondingly preferred embodiment variant provides that the Sealing lips are arranged displaceably with respect to the material web. It it goes without saying that the sealing lips face in different ways the circulating material web can be adjusted. For example are the sealing lips opposite the surrounding material web pivoted, so that the distance by means of the pivoting movement can vary between the sealing lips and the material web. Structurally special but it is simple if the sealing lips are opposite the circumferential Perform a translational adjustment movement on the material web. Will in Air is additionally injected in the area of the sealing lips, which means that in the area of the Sealing lips generate a kind of air knife, this is the spray area structurally particularly easy additionally sealed.

In order to easily loosen dirt from the material web in to be able to separate a drip pan, it is advantageous if the Sealing device below a material web guide and / or at least is arranged below the nozzles in the vicinity of the material web. Preferably the sealing device is designed in such a way that it is compatible with the drip pan cooperates, so that a liquid flung against the sealing device or contamination flung directly onto the sealing device the drip pan is fed.

To the air-water mixture or the mist from the spray area To remove the cleaning device particularly effectively, it is advantageous if the device has a suction device which contains the air-water mixture aspirates from the spray chamber of the material web.

As an alternative to the suction device mentioned, a blowing device can also be used be provided with which an overpressure in the area of the spray chamber provided. Then the residual liquid and the Dirt particles detached from the material web do not come out of the spray room aspirated, but pushed out of the spray room. It goes without saying that in a further embodiment variant both a suction device as well as a blowing device arranged on the cleaning device the suction device and the blowing device can be effective work together. It is possible that in one Spray space is built up by means of the blowing device, whereby the advantages described above are achieved. In addition, a Suction device can be provided in the area of the spray chamber in such a way that the residual liquid or dirt particles in the area of a drip pan be sucked off by means of a vacuum.

In this context, it turned out to be a particularly good one Cleaning a web of material is achieved when multiple nozzles in one nozzle booth are arranged in the nozzle cabin such that the individual Jets of liquid emerging in different jets Angle meet the material web and also in the nozzle cabin Overpressure is built up. It was found that the predominant in the cabin Overpressure the already very good and therefore beneficial cleaning effect the liquid jets hitting at different angles further improved. It doesn't matter whether the nozzles can be moved in addition to each other or whether they are fixed are detachably arranged in the nozzle cabin.

Since it has been shown that with the present combination of features the nozzles arranged at angles to each other and from the one in the nozzle cabin provided overpressure a particularly good cleaning result is achieved, this combination of features is also independent of the others Features of the invention are advantageous.

The object of the invention is also achieved by a method for cleaning a material web with liquid jets emerging from nozzles, in which at least two liquid jets at different angles be directed onto the material web. By steering the Liquid jets will be the area in which the liquid jets impinge on the material web, essential in the longitudinal direction of the material web extended. In this way, a wider transverse strip of the material web is cleaned, than is the case with previously known methods, so that the inventive Process helps to achieve a significantly higher cleaning intensity and thereby achieve a significantly higher cleaning quality.

In addition, the object of the invention is a method for cleaning a material web with liquid jets emerging from nozzles, solved, in which the material web cleaned with a heated liquid becomes. The contaminants can be removed with a heated liquid much faster and more thoroughly from the dirty material balm peel off so the cleaning intensity with regard to a procedure for cleaning a material web this also significantly increases and is therefore improved.

A particularly preferred method variant provides that the liquid the liquid jets to a temperature above 30 ° C or above 60 ° C, preferably heated to about 70 ° C.

In this context, it is advantageous if the liquid is on a Temperature below 90 ° C, preferably below 80 ° C, heated becomes.

The cleaning process has been found to be particularly effective can be when the liquid jets the liquid onto a Temperature of about 70 ° C is heated. With a temperature around 70 ° C on the one hand, dirt can be removed more easily from the surrounding material web be solved. On the other hand, the energy required to heat up remains the liquid within economically justifiable limits.

In order to clean differently soiled areas of the material web it is advantageous if at least some of the nozzles are uneven Speed is moved transversely to the direction of travel of the material web.

This ensures that the nozzles in areas that experience has shown are more polluted, can stay longer than in less polluted Areas.

As experience has shown, the contamination in the edge areas of the material web is particularly strong, it is advantageous if at least some of the nozzles are in an edge region of the material web is moved more slowly than in one Material web area between two edge areas.

The term “edge area” is an area of a circumferential web of material meant that limits the material web laterally along its running direction. The edge region preferably has a width of less than 100 mm, especially less than 50 mm. It is understood that a such edge area is present on both sides of the material web.

Cumulatively or alternatively, it is advantageous if at least one part the nozzles are moved over an edge area of the material web more often than over a material web area between two edge areas.

It is clear that this edge area is cleaned more intensively than other areas the material web, if nozzles of a composite nozzle are located over the edge area are moved more often than over the remaining material web area.

With particularly stubborn dirt in an edge area it is furthermore advantageous if at least some of the nozzles are in one Edge area of the material web at least briefly without transversing is held.

The term "transversing" is a movement of the nozzle assembly along a traverse arranged over the material web, on which the nozzle assembly moves across the material web.

Another method variant provides that at least some of the nozzles is moved back and forth in the direction of travel of the material web. Due to the oscillating movement of the nozzles, it is possible to spray a liquid in addition to the already known relative movement across the material web additionally with a relative movement of the nozzles in the running direction to move the material web.

In this context, it is particularly advantageous if at least one Part of the nozzle is aligned so that the liquid jets emerging from it meet the material web in an area in which the Material web does not touch a material web guide.

On the one hand, this increases the risk of damage to the material guide through a liquid jet that is permanently aligned with the material web guide reduced. On the other hand, liquid jets can at least partially penetrate the web without touching the surface of the web guide bounce.

In addition, it is advantageous if the material web is less than 20 times, preferably less than 15 times, while at least part of the Nozzle is moved once across the material web.

By such a movement of the nozzles in the running direction or against the The cleaning intensity is further increased in the direction of travel of the material web.

Accordingly, it is advantageous if the material web more than 5 times, preferably more than 8 times, while at least a portion of the nozzles is moved once across the material web.

In order to ensure that the nozzles are ready for use as continuously as possible, it is beneficial if at least part of the nozzles by time is being cleaned at the time.

In this context, it is particularly advantageous if at least one Part of the nozzles is cleaned during the cleaning of the material web.

It is conceivable that the traverse, on which the nozzles are transverse to the direction of travel the material web are moved on both sides of the material web survives. This creates the possibility that during a first Nozzle assembly cleans the material web, a second nozzle assembly next to it the material web is cleaned. So there is at least always one Nozzle assembly in use to clean the web of material, meanwhile another nozzle assembly is cleaned.

This ensures continuous cleaning of the material web, although at the same time part of the nozzles or a nozzle assembly itself was cleaned becomes.

To clean the material web under almost constant conditions To be able to, it is advantageous if at least some of the nozzles in one Period between 10 minutes and 60 minutes is cleaned.

As already mentioned, the nozzles can be cleaned particularly easily, if at least some of the nozzles extend beyond the edge area of the material web is proceeded.

The nozzle side facing the material web is in such a position is no longer covered by the material web, so that the nozzles on this side of a cleaning facility opposite them can be cleaned. This process is particularly simple, if a nozzle assembly, which is attached to a traverse across the material web is moved, also by means of this traverse over the material web area out into a maintenance area.

To reduce the risk that when cleaning the material web this damaged by the liquid jets or excessive wear exposed, it is advantageous if the liquid jet with less than 250 bar, preferably less than 200 bar, onto the material web is directed. As a result, the material web is relatively gentle the liquid jets cleaned, so that the life of the material web versus webs of material that have pressures with respect to liquid jets cleaned above 300 bar or over 500 bar, significantly increased is.

The use of a device according to one of the above is advantageous mentioned device claims for cleaning a felt, a nonwoven or a sieve or a woven structure.

The felts and nonwovens mentioned here represent so-called "non-woven" structures and are therefore not a limitation understand with regard to the use of the device. for example the term “non-woven” includes structures such as knitted fabrics, scrims, knitted fabrics, in particular also structures that are made from a knitted fabric.

In the present case, a woven structure means a structure from warp and weft threads.

Further advantages, goals and characteristics of the present invention will become apparent described with reference to the following explanation attached drawing, in which are shown as examples of some cleaning devices.

For the sake of clarity, components with the same effect or those with the same effect Provide component groups with the same reference numbers.

Figur 1

schematisch eine perspektivische Ansicht eines Ausführungsbeispiels einer ersten Reinigungsvorrichtung,

Figur 2

schematisch eine perspektivische Ansicht eines Ausführungsbeispiels einer zweiten Reinigungsvorrichtung mit einer gegenüber einer umlaufenden Materialbahn verstellbaren Dichteinrichtung,

Figur 3

schematisch eine Seitenansicht eines Sprühbereiches einer Reinigungsvorrichtung,

Figur 4

schematisch eine Vorderansicht eines Sprühbereiches einer weiteren Reinigungsvorrichtung,

Figur 5 bis 7

schematisch perspektivische Ansichten verschiedener Düsenverbünde und

Figur 8

schematisch eine Seitenansicht eines vor einer Materialbahn angeordneten Düsenverbundes mit schräg angestellten Düsen.

It shows

Figure 1

schematically shows a perspective view of an embodiment of a first cleaning device,

Figure 2

schematically a perspective view of an embodiment of a second cleaning device with a sealing device that is adjustable relative to a rotating material web,

Figure 3

schematically a side view of a spray area of a cleaning device,

Figure 4

schematically a front view of a spray area of a further cleaning device,

Figure 5 to 7

schematic perspective views of different nozzle assemblies and

Figure 8

schematically a side view of a nozzle assembly arranged in front of a material web with inclined nozzles.

The cleaning device 1 shown in FIG. 1 uses four Deflection rolls 2, 3, 4, and 5 a material web 6 on a nozzle support 7 past.

For this purpose, the deflection rollers 2 to 5 each rotate about an axis of rotation 2A, 3A, 4A and 5A, the deflecting roller 5 according to the direction of the arrow 8 is driven. This is the direction of movement of the material web 6 according to arrow 9, so that the material web 6 from an upper Area 10 coming into a lower area 11 past a composite nozzle 12 is performed. The material web 6 is in this embodiment a circumferential felt web and is by means of liquid jets 13th cleaned in the area of the nozzle assembly 12. The through the liquid jets 13 cleaned material web 6 is by a circumferential strip 14 clarifies.

In addition, the nozzle assembly 12 can be transverse to the direction 9 of the web 6 are moved according to the directions of arrow 16. Consequently can the nozzle assembly 12 at any point of the material web 6 between the upper roller 4 and the lower roller 3 are moved.

It is possible for the support 7 to also have a relative movement the circumferential web of material 6 according to the directions of arrow 15 can perform, whereby the nozzle assembly 12 if necessary between the roller 4 and the roller 3 can be moved back and forth.

The nozzle assembly 12 can in particular transverse to the direction 9 of the web 6 can be moved at different speeds, so that the nozzle assembly 12 both in the left edge area 6A and in the right edge area 6B can linger longer than in other areas of the material web 6. This enables the cleaning cycle of the material web 6 depending on the degree of contamination, so that the nozzle assembly 12 for example, can remain longer than in the edge regions 6A and 6B in the intermediate area of the material web 6.

Support 7 has a maintenance area on its right side 17 18, in which the nozzle assembly 12 is arranged at least temporarily can be. For example, this is the case when the nozzle assembly 12 must be cleaned so that the full functionality of the nozzle assembly 12 is also guaranteed over a long period of use.

In this embodiment, the maintenance area 18 is on the right besides the material web 6, however, it goes without saying that a maintenance area 18 arranged to the left of the material web 6 or on both sides of the material web 6 can be.

The liquid jets 13 are in this embodiment on a Warmed up temperature of approx. 70 ° C.

The embodiment of the cleaning device 19 of Figure 2 has in essentially the same structure as the cleaning device already explained 1 from FIG. 1. However, the support 7 is not in the running direction 9 the material web 6 movable, but rigid in the region of the deflection roller 4 fixed and the support 7 consists of an upper part 7A and one Lower part 7B between which the nozzle assembly 12 is transverse to the direction of travel 9 of the material web 6 moves.

The exemplary embodiment of a cleaning device 23 shown in FIG. 3 shows a lower deflection roller 3, which according to arrow direction 24 about the axis of rotation 3A rotates so that a material web 6 according to the direction of arrow 9 the rotation of the deflection roller 3 is moved.

A spray chamber 25 is arranged on the deflection roller 3. In the spray room 25 there is a nozzle assembly 12 which has two liquid jet nozzles 26 (numbered here only as an example). The nozzle assembly 12 can rotate one around an axis of rotation 27 and the other along one Path curve 28 to be moved about the axis of rotation 3A.

A collecting trough 29 is arranged in the lower region of the spray chamber 25, in which dirt detached from the material web 6 as well as used liquid 36 (see FIG. 4) of the liquid jets 13 collect and be derived from there from the spray room 25.

The spray chamber 25 is in its area below the deflection roller 3 by means of a sealing device 20 separated from an outer region 30.

Because in particular in the area of the sealing device 20 due to the rotational movement the deflecting roller 3 in the direction of arrow 24 a relatively large amount of dirt particles and entrained water particles with the surrounding material web 6 is a very good seal in the area of the sealing device 20 particularly important. Therefore, the sealing device 20 has a sealing lip 22, which in this embodiment bears lightly on the material web 6, so that the spray chamber 25 is particularly tight in this area.

The sealing lip 22 preferably consists of a material which is softer than that of the material web 6, so that the wear, which is at least every now and then touching sealing parts, mainly on the part of Sealing lip 22 is found.

Around the sealing device 20 or the sealing lip 22 with respect to the material web 6, the sealing device 20 can according to the directions of arrow 31 are moved in translation.

The spray chamber 25 shown in FIG. 4 has 25A in its upper region a nozzle assembly 12 on and in its lower region 25B a drip pan 29, a sealing device 20 and a suction device 32.

The nozzle assembly 12 is about the axis of rotation 27 according to the direction of arrow 33 rotatably mounted. Thus, the individual liquid jet nozzles 26 Swing up and down in the direction of arrow 34. This will make it special favorable cleaning effects on the material web 6 (Figures 1 to 3) achieved.

The sealing device 20 here comprises a sealing lip 22 with which the Spray chamber 25 is particularly good with respect to the surrounding material web 6 can be sealed.

Dirt particles 35 to be removed from the spray chamber 25 and the used one Liquid 36 are in the spray chamber 25 in a drip pan 29 collected and discharged through a catch pan outlet 29A.

In addition, a water-air mixture through openings 32A of the suction device 32 sucked out of the spray chamber 25.

In a slightly modified embodiment of a cleaning device 23 it is possible to generate an overpressure in the spray chamber 25, so that dirt particles 35 and the used liquid 36 do not sucked into the sump 29, but are pressed and then aspirated from the drip pan 29 through the drip pan outlet 29A become.

The different nozzle assemblies 37 shown in FIGS. 5 to 7 (Figure 5), 38 (Figure 6) and 39 (Figure 7) each have different from each other arranged nozzles 26.

The nozzle assembly 37 here comprises four pairs of nozzles 37A, 37B, 37C and 37D, which is arranged on an uneven surface 38 on the nozzle assembly 37 are. The uneven surface 38 has one in this embodiment zigzag shape, so that at least pair of nozzles 37A are opposite at least one further pair of nozzles 37D arranged at an angle α is. As a result, the liquid jets 13 of the nozzle pairs 37C also hit and 37D from different directions onto a material web 6 (see Figure 1).

Thus, those emanating from the pairs of nozzles 37A, 37B, 37C and 37D Liquid jets 13 at least when they hit the material web 6 partially different beam angles β and γ (see FIG. 8) to one another, whereby the nozzle assembly 37 has a very large cleaning width 43 (see Figure 8) reached.

The nozzle assembly 38 (FIG. 6) has an approximately flat surface 41 which is arranged a plurality of liquid jet nozzles 26. The However, liquid jet nozzles 26 are not lined up linearly one behind the other, but are arranged along a curved line. In contrast to the liquid jet nozzles 26 of the nozzle assembly 37 are the liquid jets of the nozzle assembly 38 are not at different angles to one another arranged. The liquid jet nozzles 26 are flat on the plan surface 41 distributed, so that this also has a larger cleaning width 43 can be achieved.

The nozzle assembly 39 (FIG. 7) comprises both nozzles 26 which are planing on one Surface 41 are arranged as well as nozzles 26 on an uneven surface Surface 40.

By combining the arrangement of nozzles 26 on a flat surface 43 and an uneven surface 40 becomes the cleaning intensity of the nozzle assembly 39 compared to known nozzle arrangements improved, as a result of this both liquid jets running parallel to one another as well as liquid jets at an angle to one another 13 can be generated.

In FIG. 8, the nozzle assembly 37 from FIG. 5 is in front of a material web section 42 of a material web 6 (see FIG. 1). in this connection it can be clearly seen that, due to the arrangement, the nozzle pairs in particular 37A and 37B and 37C and 37D are arranged at angles α to one another are and the liquid jets 13 with different impact angles β and γ meet the material web cutout 42. This results in one high cleaning width 43, which is much larger than in a previously known Nozzle assembly. With the larger cleaning width 43 material webs can 6 can be cleaned much faster.

The impact angles β and γ of the liquid jets 13 are always on measured on an identical side of the liquid jets 13, so that a more reliable Comparison of the impact angles β and γ can be made can. In this embodiment, the angles β and γ are left of the liquid jets 13 and between them and the material web section 42 measured.

Claims (13)

Device (1; 19; 23) for cleaning a material web (6) with nozzles (26) for generating a liquid jet (13), in which the nozzles (26) are combined to form at least one nozzle assembly (12; 37; 38, 39) and the nozzle assembly (12; 37; 38, 39) is displaceable in the direction of an axis of rotation (2A, 3A, 4A, 5A) of a material web guide (2, 3, 4, 5), characterized in that at least two nozzles (26) are arranged at an angle (α) to one another. Device (1; 19; 23) for cleaning a material web (6) with nozzles (26) for generating a liquid jet (13), in which the nozzles (26) are combined to form at least one nozzle assembly (12; 37; 38, 39) and the nozzle assembly (12; 37; 38, 39) is displaceable in the direction of an axis of rotation (2A, 3A, 4A, 5A) of a material web guide (2, 3, 4, 5), characterized in that several nozzles (26) of the Nozzle assembly (12; 37; 38, 39) are arranged on a surface both side by side and one behind the other. Device (1; 19; 23) for cleaning a material web (6) with nozzles (26) for generating a liquid jet (13), in which the nozzles (26) are combined to form at least one nozzle assembly (12; 37; 38, 39) and the nozzle assembly (12; 37; 38, 39) is arranged to be displaceable in the direction of an axis of rotation (2A, 3A, 4A, 5A) of a material web guide (2, 3, 4, 5), characterized in that the device (1; 19 ; 23) has a heating device with which a liquid of the liquid jet (13) is preheated. Device (1; 19; 23) according to one of claims 1 to 3, characterized in that at least individual nozzles or the nozzle assembly (12; 37; 38, 39) is arranged within a spray space (25) or within a nozzle booth. Device (1; 19; 23) according to one of claims 1 to 4, characterized in that a compressed air supply is arranged on a spray chamber (25) of the cleaning device (1; 19; 23) or on a nozzle cabin. Device (1; 19; 23) according to one of claims 1 to 5, characterized in that the nozzle assembly (12; 37; 38, 39) at least two rows of staggered nozzles, preferably in the form of pairs of nozzles (37A, 37B, 37C, 37D ), having. Device (1; 19; 23) according to one of Claims 1 to 6, characterized in that at least one nozzle (26) has means for rotating and / or means for rotating. Device (1; 19; 23) according to one of claims 1 to 7, characterized in that a crossmember, on which nozzles are moved transversely to the direction of travel of the material web, is wider than the material web. Device (1; 19; 23) according to one of claims 1 to 8, characterized in that the device (1; 19; 23) has at least one sealing device (20) which seals a spray chamber (25) with respect to the material web (6) and which is arranged adjustable relative to the material web (6). Device (1; 19; 23) according to claim 9, characterized in that the sealing device (20) has sealing lips (22) which correspond to the material web (6) without contact or at least with little contact. Method for cleaning a material web (6) with liquid jets (13) emerging from nozzles (26), characterized in that at least two liquid jets (13) are directed onto the material web (6) at different angles (β, γ). Cleaning method according to claim 11, characterized in that at least some of the nozzles (26) are oriented such that the liquid jets (13) emerging therefrom strike the material web (6) in a region in which the material web (6) guides the material web ( 2, 3, 4, 5) not touched. Cleaning method according to one of claims 11 or 12, characterized in that at least some of the nozzles (26) are cleaned during the cleaning of the material web (6).

Images