EP0807710A1 - Process and device for direct or indirect application of a liquid or pasty media on a running material web,in particularly of paper or board - Google Patents

Abstract

The assembly, to apply a liquid or paste coating to a paper or cardboard web, has a carrier beam mounted at least at two points across the web width. The carrier beam carries a scraper blade against the counter roller (14). Each mounting point has two spaced setting rods (6) with one end at linkages (P1,P5) at the carrier beam and the other ends linked (P2,P6) to at least one foundation (12,12'). At least one support rod (10) has one end at a linkage (P3) at the carrier beam, and the other end linked (P4) to the foundation (12'). At least one rod (6,10) has a length adjustment. Also claimed is a web coating operation with a related and/or unrelated controlled length setting of at least one setting rod (6) or support rod (10) for each mounting point, to adjust the coating scraping angle ( alpha ) between the scraper blade and the facing counter roller (14) and/or a scraper pressure unit and/or the carrier beam for positioning in a working, inactive or intermediate setting.

Description

The invention relates to a device for the direct or indirect application of a liquid or pasty medium to a running web of material, in particular of paper or cardboard, according to the preamble of claim 1.

Furthermore, the invention relates to a method for the direct or indirect application of a liquid or pasty medium to a running material web, in particular made of paper or cardboard.

Such devices and methods are known in a variety of configurations. Known devices include applicators which rest on a support beam and are designed either for the direct or indirect application of a liquid or pasty coating medium to a running material web or for the final metering of a coating medium previously applied to the material web. The coating medium is usually applied via a pressure chamber with a doctor element, a free jet nozzle or a comparable other known application device. In the case of so-called direct application, the coating medium is applied directly to, for example, a counter roller opposite the support beam supported running material web applied, while in the indirect application the coating medium is first transferred, for example, to an application roller opposite the supporting beam and then from its surface to the material web. In the second case, that is to say in the case of an application unit for final metering, a doctor blade or a comparable other known doctor element is provided in order to fine-meter the coating slip already applied to the material web to the desired application quantity.

DE 4130118 C2 discloses a generic device for the direct or indirect application of a liquid or pasty medium to a running web of material, in particular made of paper or cardboard, with a supporting beam which extends in its longitudinal direction essentially over the entire width of the web of material , is mounted at two bearing points and comprises a final metering device in the form of a doctor blade, a doctor rod or a scraper bar. In this device, the two bearing points are located in two long swivel arms, each of which is arranged at the front ends of the support beam, ie outside the web width of the running material web, by means of which the support beam can be pivoted about an axis parallel to the longitudinal axis of the support beam into a working, intermediate and maintenance position . However, this type of device not only has the disadvantage of problematic supporting beam deflections and comparatively low natural frequencies, which lead to undesired resonances, for example with vibration frequencies of the base of the device or of the hall floor in which the device is installed, but also requires a very large, massive and thus heavy and costly pivoting device. An adaptation to changing operating conditions, such as changing counter-roller diameters, wear of the final metering device, change of the coating angle setting between the End dosing device and the counter roller or a change in the contact pressure of the end dosing device is only possible with this device with considerable effort and sometimes not at all. Due to the large masses to be moved and long lever arms, fast swiveling movements of the supporting beam can only be carried out using powerful and therefore expensive actuators.

Furthermore, it has proven to be problematic in conventional devices that, when using doctor blades as the final metering device, on the one hand an adjustment of the blade angle, i.e. the angle between the doctor blade and a tangent applied to the opposite application roller, by pivoting the support beam to an undesirable change in the blade contact pressure or even to lift the doctor blade and on the other hand a change in the blade contact pressure to an undesirable change in the blade angle and thus to an irregularity of the coating profile leads, which reduces the quality of the manufactured product.

The invention is therefore based on the technical problem of creating a generic device which avoids the above-mentioned problems of the prior art and which, in a simple and effective manner, allows the device to be adapted to changing operating conditions, in particular a change in the coating or Blade angle and the contact pressure of the end metering device.

This object is achieved by a device according to the invention with the features of claim 1.

Accordingly, a respective storage location of the device comprises two spaced-apart bearing rods, each of which is articulated at one end to articulation points of the supporting beam and articulated at its other end to at least one foundation. The support beam thus comprises a total of two bearing rod pairs, that is, one bearing rod pair per bearing point. Furthermore, at least one support rod is articulated at one end to the support beam and articulated at the other end to the foundation. Furthermore, at least one of the aforementioned rods is adjustable in length. It should be taken into account here that a length adjustment of one of the two bearing rods of a bearing point naturally means a synchronous adjustment of the corresponding bearing rod of the two bearing rods at the other bearing point, in order to avoid tilting of the support beam and to ensure a uniform adjustment of the support beam . The same synchronous adjustment is required if more than one support rod is used. The hinge point or the hinge axis of the at least one support rod is preferably spaced from the hinge points of the two bearing rods or differs from the hinge axes of these two bearing rods in order to achieve a specific desired support beam movement. With a suitable arrangement of the articulation points or articulation axes of the two support rods, the articulation point or the articulation axis of the at least one support rod can, however, coincide with the articulation point or the articulation axis of one of the two support rods.

Within the meaning of the invention, bars are to be understood to mean any gear members with two articulation points. In the embodiment according to the invention, either the two spaced-apart bearing rods together with the supporting beam or one of the two bearing rods together with the at least one supporting rod and the supporting beam form a kind of quadrilateral joint when viewed from the side, the Supporting beam serves as a connecting link between the bearing rods or between one bearing rod per bearing point and the support rod. At least one of the rods mentioned, which can be designed as a simple lever or even adjustable in length, stabilizes this in a movable structure. The overall construction formed from the bearing rods, the support beam and the at least one support rod is accordingly rigid unless at least one of the rods is adjusted. In a plan view of the supporting beam, the two pairs of bearing rods together with the at least one support rod form a type of tripod. Suitable flexible or elastic components or hinges can also serve as joints for the bars.

The device according to the invention allows the application mechanism of the device to be adapted to changing operating conditions in a simple and effective manner, in particular it enables the strike angle (or blade angle if a doctor blade is used as a final metering device) and the contact pressure of the final metering device to be changed easily ongoing operation as well as at standstill. Not only this adjustment of the end metering device, but also a movement of the entire support beam into an operating, standby or service or maintenance position can be carried out universally by just a single functional component, namely the length-adjustable rods. This saves complex and expensive additional individual adjusting devices and therefore allows a simplified and less expensive overall construction. Since in a length adjustment, in particular an opposite length adjustment, one of the two bearing rods and the at least one support rod, which together with one of the bearing rods takes on a substantial part in the adjustment of the supporting beam and the components associated with the supporting beam, is essentially one rotational or combined rotational-translational movement of the support beam about an axis or on a short movement path near the axis of the lowest moment of inertia of the support beam, the adjustment movements can be carried out very quickly and with little effort.
Due to its specific design, the device according to the invention, with a suitable choice of the respective rod lengths and positions and the arrangement of the articulation points of the supporting beam, also opens up the possibility of setting a largely arbitrary blade angle of the final metering device without the blade lifting off the counter roller during the adjustment process, the contact pressure increases changes unintentionally or there is an impermissible deflection of the blade. This ensures a regular coating profile and contributes to the creation of a high quality end product. It should be noted that the position of the point of contact between the blade tip of a doctor blade used as a final metering device and the counter roller, ie the applicator roller, changes slightly when the blade angle is adjusted due to the special design of the device according to the invention. However, this does not affect the application of the liquid or pasty medium in any way, since the blade tip follows when the roller contour is adjusted and is always optimally in contact with the counter-roller when the component geometries and positions are selected appropriately. In this way, the device can be easily adapted to different roller diameters and to any blade wear. The device according to the invention is also suitable for various types of final metering device, for example for doctor bars (for example PC-Rollflex®), scraper bars, or when using doctor blades for both so-called stiff-blade and bent-blade designs. So the device can flexibly adapt to any major blade angle changes or deviations to adjust. The device according to the invention is therefore basically suitable for processing a wide variety of material web types. In contrast to the prior art mentioned at the outset, the device according to the invention is also not restricted to an arrangement of the bearing points outside the web width of the material web or outside the longitudinal support beam extension. This will be referred to in more detail below.

According to an advantageous embodiment of the invention, it is provided that the hinge points of the two bearing rods on the supporting beam side essentially coincide. This configuration is particularly favorable in order to implement the previously described desired movement of the supporting beam for adjusting the blade angle and the contact pressure.

In a preferred embodiment of the invention, the bearing rods and / or the at least one support rod are further configured as length-adjustable actuators. Such actuators can be, for example, suitable mechanical, hydraulic, pneumatic, electrical, electromagnetic actuators and the like, and combinations thereof.

Another advantageous embodiment of the invention provides that the length-adjustable actuators are dependent and / or independently adjustable. In this way, by means of a suitable, coordinated movement of one or more of these actuators, a desired movement of the support beam and the components directly or indirectly attached to it, in particular the final metering device, such as a doctor blade and the like, can be carried out relative to a counter roller opposite the support beam will.

It has proven to be advantageous that the device according to the invention further comprises at least one control and / or control and / or regulating device for the controlled adjustment of the length-adjustable rods or actuators. When using a control device, this advantageously comprises an automatic control circuit which, based on measured values, for example of the blade angle, the contact pressure, the cross profile or other properties of the liquid or pasty medium applied to the counter-roller, in particular the final metering device, i.e. adjusts the blade angle and, if necessary, the contact pressure of the doctor blade by suitable adjustment of the length-adjustable actuators and thus by movement of the supporting beam. This allows the application mechanism of the device to be adapted as quickly as possible to changed conditions and also avoids longer downtimes. The control and / or control and / or regulating device according to the invention can further comprise components which also allow manual, automatic or remote-controlled actuation of the actuators. If necessary, it also enables central control or regulation and control-related linking of the length-adjustable actuators with other components of the device.

According to a further advantageous feature of the invention, it is provided that the at least one articulated support rod is arranged in the center of the beam in relation to the longitudinal direction of the supporting beam. According to an equally advantageous embodiment variant, the at least one articulated support rod can also be arranged asymmetrically with respect to the longitudinal direction of the supporting beam in relation to the center of the supporting beam. In this way, the movable structure formed by the two articulated bearing rods and the supporting beam can be stabilized particularly easily and the spacing of the supporting beam be kept at a constant value over its entire longitudinal extent relative to the opposing counter roll.

Another cheap modification according to the invention provides that the at least one articulated support rod is provided at at least one bearing point. If only one support rod is used, this is also an arrangement asymmetrical with respect to the center of the supporting beam. This also allows a very stable and rigid fixation of the support beam and an exact positioning relative to the opposite counter roller. In addition, the support rod is also easily accessible and easy to maintain in this position due to its proximity to the lateral ends of the supporting beam.

For the device according to the invention, a doctor blade has proven to be a particularly advantageous final metering device. As already mentioned above, not only different doctor blade designs, such as stiff blade and bent blade designs, but also various other final metering devices, such as doctor rods or the like, can be successfully used in the device according to the invention.

According to the invention it is further provided that the bearing points of the supporting beam are arranged in the longitudinal direction of the beam at a distance from its two front ends within the longitudinal direction of the beam. This arrangement of the bearing points of the support beam reduces the deflection of the support beam compared to conventional designs with the same cross-sections and wall thicknesses. Furthermore, in this solution according to the invention, the natural frequency of the supporting beam is higher than in conventional configurations. This results in a greater distance between the natural frequency of the support beam and the vibration frequencies, for example of Machine foundations and the hall floor on which the application works resting, so that a resonance oscillation in the supporting beam is reliably prevented. The higher natural frequency also results in greater flexibility with regard to the structural design of the support beam.

In a preferred embodiment of the invention, the two bearing points of the supporting beam are arranged symmetrically to the center of the beam in the longitudinal direction of the beam. If it is expedient due to structural conditions, the two bearing points can also be arranged asymmetrically in the longitudinal direction of the beam in a further advantageous embodiment of the invention in relation to the center of the beam.

In a particularly favorable embodiment of the invention, the distances between the bearing points and the end beam ends are in each case 15% to 30% of the beam length. The distances of the bearing points to the respective adjacent end beam ends can be the same or different, so that there is a symmetrical or asymmetrical arrangement of the bearing points. In a preferred embodiment with bearing points arranged symmetrically with respect to the center of the beam, the distance between the bearing point and the end of the beam end is in a length range which is approximately 22% to 25% of the supporting beam length with regard to the smallest possible beam deflection.

A further advantageous embodiment of the invention consists in equipping the supporting beam with a deflection compensation device known per se. Such a deflection compensation device can be a configuration based on thermal, pneumatic or hydraulic compensation, but also a configuration based on another compensation principle, such as magnetic, inductive or mechanical compensation Configuration. An expedient solution is, for example, to provide pulling or pushing rods which extend in the longitudinal direction of the supporting beam and which are actuated by pulling or pushing devices in order to compensate for undesirable deflections. Since the wall thicknesses of the support beam can be reduced by the higher natural frequency in the solution according to the invention, the deflection compensation device can also be dimensioned smaller in comparison to a conventional construction, because the support beam with the smaller wall thicknesses can be compensated for more easily in its deflection. According to the invention, a lighter supporting beam is obtained both through the lower wall thickness of the supporting beam and through the less complex deflection compensation device. The solution according to the invention can thus also be implemented more cost-effectively. The cross-sectional shape of the support beam can be selected to be triangular, polygonal, round or in another suitable manner, depending on the structural conditions.

The object on which the invention is based is further achieved by a method according to the invention for the direct or indirect application of a liquid or pasty medium to a running material web, in particular made of paper or cardboard, by means of a device according to claim 1, the method comprising the features of claim 16 .

In such a method, a method step according to the invention comprises an independent and / or dependent, controlled length adjustment of at least one of the bearing bars of the device per bearing point or the at least one support bar, by a strike or bell angle between the final metering device and the counter roller opposite the device and / or a contact pressure of the final metering device on this counter roller adjust and / or move the support beam into an operating, intermediate or maintenance position. In the sense of the invention, an adjustment of the different bars can also be carried out sequentially.

A single rod length adjustment (in the case of the bearing rods always related to a respective bearing point of the supporting beam) can therefore perform several functions, i.e. the aforementioned adjustment of the line or blade angle of the final metering device, the change of the contact pressure of the final metering device or a movement of the supporting beam into an operating, intermediate or maintenance position. In addition, the method according to the invention offers the advantages already described in connection with the device according to the invention.

A further advantageous method step of the method according to the invention provides for moving the supporting beam on a predetermined path curve by means of independent and / or dependent controlled length adjustment of the two bearing bars of a respective bearing point of the supporting beam. With simultaneous adjustment of both bearing rods per bearing point, whereby this adjustment can be quite different, the length of the at least one support rod, whether adjustable in length or not, is kept constant.

In addition, according to another advantageous embodiment of the method according to the invention, a method step is provided in which the supporting beam is moved on a predetermined trajectory curve by means of independent and / or dependent controlled length adjustment of at least one of the two bearing rods per bearing point and the at least one support rod. In this way, the freedom of movement of the support beam can be expanded. In this step, only one of the two bearing rods per Adjusted bearing point, the length of the non-actuated bearing rod, whether adjustable or not, is kept constant. With a suitable choice of the lengths and the arrangement of the bars of the device, the path curve can be influenced in such a way that it shrinks almost to a point, ie the support beam essentially rotates. An adjustment of both the two bearing rods and the at least one support rod is also included in this process step. The respective adjustment movements can be in the same direction and / or in opposite directions.

Another advantageous embodiment variant of the method according to the invention provides that the supporting beam is moved on a predetermined path curve by means of independent and / or dependent controlled length adjustment of at least one of the two bearing rods per bearing point and of the at least one supporting rod.

Depending on the application, the supporting beam can advantageously also be moved on a predetermined path curve by means of independent and / or dependent controlled length adjustment of the two bearing bars per bearing point.

In addition, it has proven to be particularly advantageous that, according to a further advantageous embodiment of the method according to the invention, the movement of the support beam (2) and changing the strike angle is only effected by controlled length adjustment of the support rod, so that the final metering device during the movement of the support beam and the change of the strike angle of the contour of the counter roller essentially follows exactly.

The possibility of using the method steps described above naturally depends on the particular design of the device according to the invention.

According to a further advantageous embodiment of the invention, it is provided that the movement of the support beam is automatically controlled by means of suitable control devices, the control taking place as a function of a desired coating weight and / or wear of the final metering device and / or the counter roller. This in turn allows the application work of the device to be adapted as quickly as possible to changed conditions and avoids longer downtimes. Furthermore, this measure enables, if necessary, a central control or regulation and control-technical connection of the length-adjustable actuators causing the movement of the support beam with other components of the device.

The computer-aided regulation of the movement of the supporting beam provided according to the invention has proven particularly useful.

Fig. 1

eine schematische Perspektivansicht einer ersten Ausführungsform der erfindungsgemäßen Vorrichtung,

Fig. 2

eine schematische Seitenansicht der in Fig. 1 dargestellten erfindungsgemäßen Vorrichtung im Bereich einer Lagerstelle, und

Fig. 3

eine der Fig. 2 vergleichbare Seitenansicht einer zweiten Ausführungsform der erfindungsgemäßen Vorrichtung.

A preferred embodiment and further details and advantages of the device according to the invention and of the method according to the invention are now described and explained below with reference to the drawings. It shows:

Fig. 1

2 shows a schematic perspective view of a first embodiment of the device according to the invention,

Fig. 2

2 shows a schematic side view of the device according to the invention shown in FIG. 1 in the area of a bearing point, and

Fig. 3

a side view comparable to FIG. 2 of a second embodiment of the device according to the invention.

In the following description and in the drawings, identical parts or components are also identified with the same reference symbols in order to avoid repetitions, provided that no further differentiation is necessary.

1 shows a schematic, perspective illustration of a first general exemplary embodiment of a device according to the invention for the direct or indirect application of a liquid or pasty medium to a running web of material, in particular of paper or cardboard. The device opposite a counter roller (not shown in this figure (which can in principle be both a roller supporting a running material web for direct application of a coating medium and an application roller for carrying out an indirect application of the coating medium) comprises a support beam 2, that of an outer tube with a closed polygonal cross section, ie in the present case an essentially triangular cross section is formed. In principle, however, any other suitable cross section can be used. An inner tube with a closed circular cross section is arranged in the interior of the outer tube and is connected in one piece to the outer tube. The inner tube and additional connecting web walls between the inner tube and the outer tube divide the space between the inner tube and the outer tube into several chambers. This internal structure of the support beam 2, which may well deviate from the construction described above, depending on the respective application, is not shown in the figures.

The support beam 2 is mounted on two bearing points S, which are only indicated schematically in FIG. 1, of which one (the left one in FIG. 1) is designed as a fixed bearing and the other (the right one in FIG. 1) is designed as a floating bearing is. The bearing points S are arranged symmetrically to the center of the supporting beam in the present case and are each indented from the front ends of the supporting beam 2 by an equal distance A, A 'to the center. The ratio of the distance A, A 'between the bearing point S and the adjacent end beam end to the total length L of the support beam 2 is in the range from 15% to 30%. With regard to the lowest possible beam deflection, a range of approximately 22% to 25% has proven to be particularly suitable. In the case of an asymmetrical arrangement of the bearing points S (not shown), the distance A of the one bearing point to the adjacent end beam end can be selected differently than the distance A 'of the second bearing point to its adjacent end beam end.

To compensate for the deflection of the support beam 2, liquid, e.g. Water, are passed through the above-mentioned chambers of the support beam 2, the liquids flowing through in the individual chambers being so variable in their temperature that they effect the deflection compensation in a thermal manner. To compensate for the beam deflection, a mechanically acting deflection compensation device using pressure hoses can also be used, as is already known from DE 39 25 517 C2.

Fig. 2 shows a schematic side view of further details of the device according to the invention shown in Fig. 1 in the region of a bearing point S. As can be seen in this drawing, a respective bearing point S of the device comprises two spaced-apart bearing rods 6 and 8, which in the present case have different lengths and in each case articulated at one end at articulated points P1, P5 of the supporting beam 2 which are spaced apart from one another and at their other end at points P2 which differ from one another and P6 are articulated on a foundation 12 of the device, the pivot point P5 of the lever 8 on the supporting beam side being slightly above the upper pivot point P1 of the bearing rod 6. The device accordingly has two bearing rod pairs, which are each formed from a bearing rod 6 and 8. Since the design and arrangement of the bearing rods 6, 8 is the same for each bearing point S, only the bearing rods of an individual bearing point S will be considered in the following description.

2, the bearing rod 6 extends essentially vertically downward from the left supporting beam side, while the bearing rod 8 extends from the left supporting beam side essentially horizontally to the left and approximately at a right angle to the bearing rod 6. The bearing rod 8 is in the present case designed as a simple lever 8 of constant length. A single support rod 10, which extends from the right side of the support beam and extends essentially parallel to the bearing lever 6, is articulated with its upper end at an articulation point P3 on the right side of the support beam 2 spaced from the articulation point P1 of the support rod 6 and with its lower end in the point P4 articulated on the foundation 12 of the device or a further foundation 12 '. In relation to the longitudinal direction of the supporting beam, the support rod 10 is thus arranged asymmetrically to the center of the supporting beam in the region of a single bearing point S. In a plan view of the supporting beam 2, which is not shown in the figures, the support rod 10 forms, together with the bearing rod pairs 6, 8 provided at the two bearing points S, a type of tripod.

The lower hinge point P4 of the support rod 10 is arranged slightly lower than the lower hinge point P2 of the support rod 6. The bearing rod 6 and the support rod 10 are in the present embodiment as length-adjustable actuators in the form of hydraulic cylinders 6, 10. In principle, however, the use of other suitable mechanical, pneumatic, electrical, electromagnetic actuators and the like, and combinations thereof, is also conceivable. The two spaced-apart hydraulic cylinders 6 and 10, when viewed from the side according to FIG. 2, together with the supporting beam 2 form a kind of quadrilateral joint, the supporting beam 2 functioning as a connecting link between the hydraulic cylinders 6 and 10. This self-moving structure is stabilized by the lever 8 acting laterally on the support beam 2, so that the overall construction formed from the hydraulic cylinders 6, 10, the support beam 2 and the lever 8 is inherently rigid if no length adjustment of at least one of the hydraulic cylinders 6 , 10 takes place.

In an operating position PB, which is illustrated in FIG. 2 by means of solid thick lines, the hydraulic cylinders 6, 10 of the device are each extended to different, defined lengths. This length presetting can of course vary considerably from case to case depending on the cylinders used and their arrangement. The upper articulation points P1, P3 of the hydraulic cylinders 6, 10 engaging the articulation points P1, P3 of the supporting beam 2 are in this position essentially on the same horizontal plane and, as already mentioned above, the longitudinal axes of the hydraulic cylinders 6, 10 run approximately parallel to one another . In this configuration, the lever 8 in the illustration according to FIG. 2 is inclined slightly to the right downward relative to the horizontal, so that the right pivot point P5 of the lever 8 engaging the pivot point P5 on the left supporting beam side is in a somewhat lower position as seen in the vertical direction the left lever pivot point P6 is located. One attached to the support beam 2 as a final metering device Doctor blade 4 is in the operating position PB for a given counter roller diameter with a defined contact pressure and a defined blade angle α on the counter roller 14 opposite the device (the direction of rotation of the counter roller 14 is indicated by an arrow). The point of contact B1 between the doctor blade 4 and the counter roller 14 is in an ideal working position on a straight line G through the center of the roller 14 and the blade tip of the doctor blade 4. The blade angle α, ie the angle between one applied to the counter roller 14 at the contact point B1 Tangent T and the doctor blade 4, in the operating position PB is usually about 40 °, but it is strongly dependent on the doctor blade type used and the doctor blade attachment, as well as the liquid or pasty medium to be processed or the material web in the case of a direct application. In the stiff-blade mode of operation, the blade angle α is usually approximately 20-45 ° and in the bent-blade mode of operation approximately up to 20 °. However, the settings mentioned are only rough indications.

In order to reduce the blade angle α from this operating position PB, for example, the left hydraulic cylinder 6 is raised by a certain amount, ie the length between the articulation points P1, P2 of the cylinder 6 is adjusted, which causes the support beam 2 to rotate about the articulation point P3 caused to the right. However, since the upper hinge point P1 of the hydraulic cylinder 6 is in the vicinity of the right hinge point P5 of the lever 8, the hinge point P1 also moves slightly upward to the right when the cylinder 6 is raised, so that the supporting beam 2 moves overall on a predetermined trajectory. As indicated by dashed lines in FIG. 2, the contact point B1 between the doctor blade 4 and the counter-roller 14 moves slightly upward against the counter during such an adjustment movement Clockwise until a new operating point, ie the contact point B2, is reached. This migration of the point of contact does not affect the application process, however, since with a suitable choice of lengths or extension lengths and the arrangement of hydraulic cylinders 6, 10 and lever 8, the predetermined path curve can be selected so optimally that the blade tip of doctor blade 4 matches the contour of counter roller 14 follows and the blade angle α decreases, but there is no increase in the contact pressure of the doctor blade 4 against the counter-roller 14.

The procedure is exactly the opposite to increase the blade angle α.

If the contact pressure of the doctor blade 4 against the counter-roller 14 is now to be increased at a blade angle α to be kept constant, a combined, ie here also an interdependent, actuating movement of the two hydraulic cylinders 6, 10 takes place, the right hydraulic cylinder 10 being slightly raised and the left hydraulic cylinder 6 is slightly lowered. Depending on the design of the device according to the invention, the point of contact B1 between the blade tip of the doctor blade 4 and the counter roller 14 can change, as in the case of the blade angle adjustment explained above. In general, a length adjustment of one of the hydraulic cylinders 6, 10 to change the blade angle α and / or the contact pressure may also be sufficient under certain conditions. If one of these parameters is changed, however, the second parameter will usually also change with this type of adjustment due to the kinematic linkage of the individual device components. If an influencing of the second parameter is not important, for example when the doctor blade 4 is lifted briefly from the counter roller 14 for passage a web splice, this adjustment method can be used. Otherwise, the above-mentioned combined actuating movement of both hydraulic cylinders 6, 10 is preferable.

The contact pressure is reduced in the opposite way.

Of course, by adjusting the hydraulic cylinders 6, 10 in a coordinated manner, a simultaneous change in the blade angle α and the contact pressure is also possible.

In order to transfer the supporting beam 2 from an operating position into a maintenance or standby position PW starting from the operating position PB, it is generally sufficient to retract the right hydraulic cylinder 10, i.e. shorten the length between the two pivot points P3 and P4. The support beam 2 then moves from the above-mentioned operating position on a predetermined trajectory into the maintenance position PW indicated in FIG. 2 by a dash-dotted line. If necessary, the left hydraulic cylinder 6 can of course also be adjusted simultaneously in this process and a combined actuating movement can be carried out.

The procedure for reversing the support beam 2 from the maintenance position PW into the operating position PB is the reverse.

The device according to the invention comprises a computer-aided control and regulating device, not shown in the drawings, for the controlled adjustment of the length-adjustable hydraulic cylinders 6, 10. This device has an automatic control circuit which, based on measured values, for example of the blade angle α, Contact pressure of the doctor blade 4 to the roller 12, the cross profile or other properties of the liquid or pasty medium applied to the counter roller 14, the blade angle α and / or the contact pressure of the doctor blade 4 by suitable length adjustment of the hydraulic cylinders 6, 10 and thus by movement of the support beam 2 readjusted. In addition, the control and regulating device comprises components which also permit manual or remote-controlled actuation of the actuators, for example via a control panel, a central computer or the like, in order to move the support beam 2, for example from the operating position PB into the maintenance position PW and vice versa. These components are not shown in the drawing for the sake of simplicity.

FIG. 3 shows, in a side view comparable to FIG. 2, a highly schematic illustration of a second embodiment of the device according to the invention. In this variant, the bearing rod 8 provided at each bearing point S, which in the embodiment according to FIG. 2 is only designed as a simple lever of constant length, is designed to be adjustable in length. Furthermore, the bearing rod 8 is articulated at one end to the support beam 2 in such a way that the support axis-side joint axis P5 of this support rod 8 coincides with the joint axis of the left pivot point P1 of the support beam 2 and thus also with the support beam-side pivot point P1 of the support rod 6. With its other end, the length-adjustable bearing rod 8 is in turn articulated at point P6 on one side of the foundation 12. Otherwise, this device essentially corresponds to that shown in FIG. 2, so that further explanations for this are not necessary. In the device according to FIG. 3, the supporting beam 2 has a due to the additional length adjustability of the bearing rod 8 Another degree of freedom, so that if necessary an even more differentiated movement of the support beam 2 and the doctor blade 4 attached to it can be carried out. With the help of the length-adjustable bearing rod 8, inaccuracies in position of the supporting beam or the components associated with it, such as the doctor blade 4, relative to the counter roller 14 caused by installation tolerances or the like, can be easily compensated for by a coordinated length adjustment of the bearing rod 8 at the bearing points S.

The invention is not limited to the embodiments explained above, which are only examples. Rather, the device according to the invention and the method according to the invention can deviate considerably from these variants depending on the application. For example, different or different rod types than those described above can be used in a device according to the invention, a “rod” always being understood to mean a kinematic transmission element with two articulation points. The articulated mounting of the bearing rods, the at least one support rod and the support beam 2 can also take place via other suitable flexible or elastic components or hinges. Furthermore, both the rod or lever lengths predetermined for a specific position of the device, for example the operating position, and the length changes of the respective rods or levers which occur during a length adjustment can be different from one another. Furthermore, more than one support rod 10 can be provided. It is possible to attach one support rod per bearing S. The individual rods can also adopt different arrangements relative to one another than those explained above and shown in the figures. It is conceivable, for example, that the bearing rod 6 and the support rod 10 intersect in an X-shaped manner when viewed as shown in FIGS. 2 and 3. Further the positioning speeds of the individual rods can differ from each other. In addition to the example of indirect application of a liquid or pasty medium described above, the device and method according to the invention are also suitable for direct application of said medium.

Reference numerals in the claims, the description and the drawings serve only for a better understanding of the invention and are not intended to limit the scope of protection.

Reference list

2

Tragbalken

4

Rakelklinge

6

Hydraulikzylinder

8

Hebel

10

Hydraulikzylinder

12, 12'

Fundament

14

Gegenwalze

α

Klingenwinkel

A, A'

Abstände der Lagerstellen S von Tragbalkenenden

B1, B2

Berührungspunkte Klingenspitze-Gegenwalze

G

Gerade

L

Tragbalkenlänge / Balkenlängserstreckung

P1 - P6

Gelenkpunkte

PB

Betriebsposition

PW

Wartungsposition

S

Lagerstellen

T

Tangente

Designate it:

2nd

Supporting beams

4th

Doctor blade

6

Hydraulic cylinder

8th

lever

10th

Hydraulic cylinder

12, 12 '

foundation

14

Counter roll

α

Blade angle

A, A '

Distances of the bearing points S from the beam ends

B1, B2

Points of contact blade tip counter roller

G

Straight

L

Support beam length / longitudinal beam extension

P1 - P6

Hinge points

PB

Operating position

PW

Maintenance item

S

Bearings

T

tangent

Claims (21)

Device for the direct or indirect application of a liquid or pasty medium to a running material web, in particular made of paper or cardboard, with a supporting beam (2), which extends in the longitudinal direction essentially over the entire width of the material web, at at least two bearing points (p ) is mounted and comprises at least one final metering device (4), and a counter roller (14) opposite the supporting beam (2),
characterized in that - A respective bearing point (S) comprises two spaced apart bearing rods (6, 8), each with its one end articulated at articulation points (P1, P5) of the support beam (2) and with its other end articulated (P2, P6) at least a foundation (12, 12 ') is fixed, - At least one support rod (10) is articulated at one end (P3) to the supporting beam (2) and articulated at its other end (P4) on the foundation (12 '), and - At least one of the aforementioned rods (6, 8, 10) is adjustable in length. Device according to claim 1,
characterized in that
the hinge points (P1, P5) of the two bearing rods (6, 8) on the supporting beam essentially coincide. Device according to claim 1 or 2,
characterized in that
the bearing rods (6, 8) and / or the at least one support rod (10) are designed as length-adjustable actuators. Device according to claim 3,
characterized in that
the length-adjustable actuators (6, 8, 10) are dependent and / or independently adjustable. Device according to one of claims 1 to 4,
characterized in that
this further comprises at least one control and / or control and / or regulating device for the controlled adjustment of the length-adjustable rods (6, 8, 10) or actuators (6, 8, 10). Device according to one of claims 1 to 5,
characterized in that
the at least one articulated support rod (10) is arranged in the center of the supporting beam in relation to the longitudinal direction of the supporting beam. Device according to one of claims 1 to 5,
characterized in that
the at least one articulated support rod (10) is arranged asymmetrically with respect to the longitudinal direction of the supporting beam in relation to the center of the supporting beam. Device according to one of claims 1 to 7,
characterized in that
the at least one articulated support rod (10) is provided at at least one bearing point (S). Device according to one of claims 1 to 8,
characterized in that
the final metering device is a doctor blade (4) or the like. Device according to one of claims 1 to 9,
characterized in that
the bearing points (S) in the longitudinal beam direction are each arranged at a distance (A, A ') from the two front ends of the supporting beam (2) within the longitudinal beam extension (L). Apparatus according to claim 10,
characterized in that
the two bearing points (S) of the supporting beam (2) are arranged symmetrically in the longitudinal direction of the supporting beam in relation to the center of the supporting beam. Apparatus according to claim 10,
characterized in that
the two bearing points (S) of the supporting beam (2) are arranged asymmetrically in the longitudinal direction of the supporting beam in relation to the center of the supporting beam. Device according to claim 11 or 12,
characterized in that
the distances (A, A ') of the bearing points (S) to the ends of the supporting beam ends each amount to 15% to 30% of the supporting beam length (L). Device according to claim 11,
characterized in that
the distances (A, A ') of the bearing points (S) to the ends of the supporting beam ends each lie in a length range which is approximately 22 to 25% of the supporting beam length (L). Device according to one of claims 1 to 14,
characterized in that
the support beam (2) is equipped with a deflection compensation device. Method for the direct or indirect application of a liquid or pasty medium to a running material web, in particular made of paper or cardboard, by means of a device according to claim 1,
comprehensively the step
Independent and / or dependent controlled length adjustment of at least one of the bearing rods (6, 8) of the device per bearing point (S) or the at least one support rod (10) by a strike angle (α) between the final metering device (4) and that of the device opposing counter roller (14) and / or a contact pressure of the end metering device (4) to set this counter roller (14) and / or to move the support beam (2) into an operating, intermediate or maintenance position. A method according to claim 16,
marked by
Moving the support beam (2) on a predetermined trajectory by means of independent and / or dependent controlled length adjustment of the two bearing bars (6, 8) per bearing point (S). A method according to claim 16,
marked by
Moving the support beam (2) on a predetermined trajectory by means of independent and / or dependent controlled length adjustment of at least one of the two bearing rods (6, 8) per bearing point (S) and the at least one support rod (10). A method according to claim 16,
marked by
Moving the support beam (2) and changing the strike angle (α) only by controlled length adjustment of the bearing rod (6), so that the final metering device (4) when moving the support beam (2) and changing the strike angle (α) of the contour of Counter roll (12) follows essentially exactly. Method according to one of claims 16 to 19,
marked by
automatic regulation of the movement of the supporting beam (2), the regulation taking place as a function of a desired coating weight and / or wear of the final metering device (4) and / or the counter roller (14). A method according to claim 20,
characterized in that
the regulation is computer-based.

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