EP3286376A1

EP3286376A1 - Calender

Info

Publication number: EP3286376A1
Application number: EP16710424.9A
Authority: EP
Inventors: Andre Hünnekens; Helmut BRUDER; Udo Mai
Original assignee: Andritz Kuesters GmbH
Current assignee: Andritz Kuesters GmbH
Priority date: 2015-04-21
Filing date: 2016-03-14
Publication date: 2018-02-28
Also published as: WO2016169701A1; CN107532384B; CN107532384A; DE102015106045B3

Abstract

In a calender having a frame (1), in which a first roll (2), a second roll (6) and a third roll (12) are mounted, wherein, during operation of the calender, the first roll forms a nip (28) either with the second roll (6) or with the third roll (12), to which end the second and third rolls can be moved between an operating position and a parked position, at least one fourth roll (16) is provided which can be moved between an operating position, in which it forms a nip (28) with the first roll (2), and a parked position without changing the parked positions of the second and third rolls (6, 12).

Description

Andritz Küsters GmbH

Eduard-Küsters-Straße 1

47805 Krefeld

calender

The invention relates to a calender, in particular for textile, nonwoven, plastic or paper webs, with a frame in which a first roller, a second roller and a third roller are mounted, wherein the first roller in the operation of the calender either with the second Roller or with the third roller forms a nip, to which the second roller between a working position, in which it forms the nip with the first roller, and a first parking position is displaceable, the third roller between a working position, in which it with the first roller forms the nip, and a second parking position is displaced. Such a calender is known from DE 100 05 306 C1. The first and second parking positions of the second and third rollers are so far away from the first roller that a movement of the respective other roller from the working position to the parking position and vice versa is possible.

In the case of calenders, in particular those for the treatment of textile, nonwoven, plastic or paper webs, there is often the need to exchange one of the two nip forming rolls through which the web is passed for treatment. Often, for certain treatments, rolls with different surface qualities of the roll shell, such as different engravings, coverings of different types and / or hardness, are required. When thermal bonding of nonwoven webs with a calender usually acts a smooth against an engraved roll. Both rollers can be executed engraved. At least one of the two rolls is regularly heated, so that the nonwoven web is at least partially melted at compressed areas produced by the elevations of the engraved roll. Since the engraving largely determines the product result, the engraved rolls must be replaced frequently. When calendering paper or textiles, preferably a roller with a coating acts against a mostly smooth or even engraved roller. The term "roller with a coating" is understood in particular to mean rollers whose lateral surface acting on the material web is formed by a covering made of, for example, plastic, rubber or even cotton, applied to the roller body but also the need to replace the covering to be able to use a different type of coating or hardness.With a coating rollers are regularly subject to a higher wear than rollers without covering, there is an additional need for the possibility of rapid roll change to the Reworking or renewing a previously used roller after reaching the wear limit.

In addition, an incentive for a quick and easy roll change may be to bring about a rapid temperature change of the working surface of a roll. Experience has shown that a temperature change to avoid thermal stresses in the roll material is only possible with 1 to 3 K / min. If there is the option of a quick roll change, rolls of different temperatures can be kept in stock and, if necessary, a temperature change can be exchanged.

If non-deflectable rolls form the nip between them, the option of rapid roll change enables a rapid change between see different cambered rollers to operate the calender with different line forces in the nip can.

The calender disclosed in DE 100 05 306 C1 and having the features cited above makes it possible to exchange a third roll forming a nip with a first roll with a second roll forming the nip with the first roll in a very short time.

However, only two rolls are available for replacement, which limits the variability of this calender.

For example, from GB 868,498 a calender is known, in which a plurality of rollers are mounted in a rotatable about an axis parallel to the longitudinal extent of the nip axis rotatable device. By rotating this device about the axis, the various rollers can be selectively shifted between a working position in which they form the nip together with another roller, and a parking position.

A disadvantage of these calenders, which are also called "revolver calenders", is the high technical complexity associated therewith, because in order to be able to exchange individual displaceable rollers, it is necessary to regularly allow almost one complete revolution of the "revolver". As a result, its construction, which allows independent drive of all rollers, independent heating and cooling of the rollers, as well as the lubrication of all bearings, structurally complex.

The invention is therefore based on the object of further developing the calender known from DE 100 05 306 C1 in such a way that the change between at least three, preferably four rolls forming a nip with a first roll is possible with comparatively little technical effort.

This object is achieved by the recited in claim 1 calender. In addition to the second and to the third roller according to the invention a device for at least a fourth roller is provided, the verla between a working position in which it forms a nip with the first roller, and a third parking position without changing the parking positions of the second and third rollers - is rerable. The invention therefore provides the option of supplementing a calender previously known from DE 100 05 306 C1 by at least one further roller which can be used for nip formation with the first roller. In contrast to the revolver calender, in which all parking positions of the rollers mounted in the turret change in the event of a roll change, the parking positions of all rather rollers, which optionally serve to form the nip with the first roller, remain unchanged. Therefore, measures can be taken at the rollers located in parking position, even if a respective roll is not affected roll change is performed. For example, measures for heating or cooling the rollers in the parking positions and rapid replacement of these rollers are possible, without affecting a currently occurring calendering process.

In a preferred development of the calender according to the invention, provision is made for a device for at least one fifth roller which is between a working position in which it forms a nip with the first roller and a fourth parking position without changing the parking positions of the second, third and fourth rollers is relocatable. In this preferred embodiment of the calender according to the invention thus four rollers are available, which can be used alternatively to form the nip with the first roller use. These four rollers may be rollers that differ in their nature and / or temperature from each other. This preferred development of the calender according to the invention is thus characterized by a particularly high variability. The invention also relates to a calender, in which at least one of the second and third rollers is mounted on the frame via first pivot levers, which are pivotably mounted on the frame about first pivot axes, and at least one of the fourth and fifth rollers via second pivot levers around second pivot axes are pivotally hinged to the frame, is mounted on the frame.

The second pivoting levers are then preferably designed such that at least one of the fourth or fifth roller is guided around a second or third roller located in its parking position during displacement between its working and parking position.

Each of the first and second pivot levers may - as preferred - be designed as a pair of pivot levers, wherein the two pivot levers of a pivot lever pair receive one of the second to fifth rollers at their ends. The respective roller thus extends between the pair of pivoting levers. It is particularly preferred if the pivot levers are designed as two-armed levers in which on one side of the pivot axis of the respective second to fifth rollers is arranged and engages on the other side of a pivot drive. Because of this design, the quarter-turn actuators can be mounted without much design effort outside the area in which the second to fifth rollers must be moved to move from the parking position to the working position and back.

In a particularly preferred embodiment of the calender according to the invention, the second pivot lever has a recess into which a second or third roller located in its parking position projects when the fourth or fifth roller mounted by the second pivot lever is in its working position. Due to this measure, a particularly compact construction of the calender according to the invention can be achieved. In order for the fourth or fifth roller to be able to be guided around a second or third roller in its parked position when shifting between work and park position, it is regularly necessary to make the arm of the lever on which the fourth or fifth roller is arranged longer as the arm a lever on which the second or the third roller is arranged. A preferred development of the calender according to the invention therefore provides that means are provided for locking the second to at least fourth, in particular for locking the fourth and optionally fifth roller in its working position, in order to avoid that acting on the fourth and possibly fifth roller, due to the larger arm length higher reaction forces are introduced exclusively via a bearing device defining the pivot axis and the respective associated pivot drive in the frame. In a particularly preferred embodiment of the calender according to the invention, the parking positions of the second to at least fourth roller are all above the nip formed by the first roller and one of the second to at least the fourth roller. This development ensures that a material web guide which is common, for example, in the thermal consolidation of a nonwoven web can be retained.

In addition, it is particularly preferred if at least the first roller is designed to be heatable and preferably also deflection-controllable, as this further increases the variability of the calender. If necessary, the second to at least fourth roller may be formed accordingly.

Due to a storage of all of the second to fifth rolls of pivoting levers, the bearing bodies of the respective roll are only rotated by a maximum angle of 140 °, preferably a maximum of 120 °, when they are displaced between their parking and working positions. This is of great advantage in particular for bearing lubrication without contacting seals and, consequently, pressureless, gravity-only oil drainage, as conventionally used in heated rolls. Because bearing lubricating oil and - return lines are thereby executed in a simple constructive manner, which is not possible, for example, in a Revolverkalander in which a rotation of the bearing body by at least 180 °. For this purpose, the calender according to the invention is preferably designed such that the angle by which the first pivot lever must be pivoted about the second or third roller to shift between their respective parking and working position, a maximum of 75 °, preferably 60 °, and particularly preferably 50 °. Furthermore, the calender according to the invention is furthermore preferably designed such that the angles by which the second pivot levers have to be pivoted in order to displace the at least fourth and, if necessary, fifth roller between their respective parking and working positions, a maximum of 150 °, preferably 120 ° and particularly preferably at most 100 °.

In order for the at least second to fourth rolls to be heated or cooled in the parking positions without the possibility of remaining deformations due to thermal stresses, these rolls must also be capable of rotation in the parking positions. Preferably, therefore, rotary drive means are provided with which this is possible. The rotary drive means may comprise a separate drive for each of the at least second to fourth rollers. This also avoids the necessity of coupling and uncoupling drives, for example a flange-around of cardan shafts when shifting between the respective parking and working positions. In particular, the rollers can be equipped with direct drives. This avoids that the drives, which are located on a separate drive block with conventional calenders, must be moved with the rollers when they are moved between their respective parking and working position.

It is also conceivable, however, to provide a main drive for the drive of the respective roller forming the nip together with the first roller and one or more auxiliary drives of lesser power designed for the parking positions, which are engaged after reaching the parking position.

An embodiment of the calender according to the invention, in which the displacement of the second to at least fourth roller between the parking and the Arbeitspositi- on by means of pivoting levers, ie essentially by rotational and almost without linear movements, also has the advantage that in Essentially easy to seal and to be lubricated bearing elements can be used. Also, such a calender according to the invention can be upgraded as needed. Thus, it is conceivable first to provide a fourth and finally a fifth or even further rollers with corresponding pivoting lever arrangements and swivel drives which can be displaced optionally between a parking and a working position in which they form a nip with the first roller.

The drawing shows an embodiment of the calender according to the invention as well as a material web guide which can be realized with this calender according to the invention. Show it:

Figure 1 shows the embodiment in a side view (view in the longitudinal direction of the rollers) with all of the movable between a parking and a working position rollers in park position.

FIG. 2 shows the same embodiment in a view corresponding to FIG. 1, with a first roller displaceable between a parking position and a working position in the working position; FIG. Fig. 3 is a view corresponding to Figure 2 with a second displaceable between a parking and a working position roller instead of the first in the working position. a view corresponding to Figure 3 with a third displaceable between a park and a working position roller instead of the second in Ar beitsposition. a view corresponding to FIG. 4 with a fourth displaceable between a parking and a working position roller instead of the third in the working position and

Fig. 6 is a side view of a schematic diagram of a feasible with the embodiment shown in Fig. 1 to 5 web guide. The designated in the drawing as a whole with 100 embodiment of the calender according to the invention comprises a frame 1, in which a first roller 2 is arranged. The first roller 2 is mounted on a carriage 3, which is displaceable by means of a hydraulically actuated piston / cylinder assembly 4 perpendicular to the longitudinal extent of the roller 2 in the frame 1, in this case in the vertical direction. The piston / cylinder assembly 4 also serves to set the first roller 2 against another roller for the purpose of nip formation, which will be described below. The first roll 2 can be designed as a heated, deflection-controllable roll with a smooth roll shell or else in another way.

A second roller 6 is pivotable about a first pivot axis 7 on the frame with the aid of a first pivoting lever 5 such that the second roller 6 between the parking position shown in FIG. 1 and the working position shown in FIG. 3, in which the second roller 6 with the first roller 2 forms the nip can be moved.

The first pivot lever 5 is designed as a two-armed lever, wherein at the opposite end of the second roller 6, a pivot drive 8 engages, which is mounted in the frame. The rotary actuator is designed as a screw jack comprehensive linear drive.

In addition, locking means 1 1 are provided on the frame 1 and comprise two locking levers 9, which can be actuated by means of hydraulically actuable piston / cylinder arrangement 10 between a rest position shown in FIG. 1 and a locking position shown in FIGS. 2 to 5 , After activating the locking means 1 1 acting on the second roller 6 in its working position forces are introduced substantially by means of the locking means 1 1 in the frame 1 and thus the pivot drive 8 relieved.

Furthermore, the embodiment 100 includes a third roller 12 which is mounted on a further pivot lever 13. This is mirror image of the first The first pivot lever 13 is thus displaceable over a first pivot axis 14 by means of a pivot drive 15 corresponding to the pivot drive 8 in such a way that the third roller 12 lies between the one shown in FIG 4 is displaceable The angle by which the first two pivot levers are respectively pivoted to displace the second and third roller between their parking and their working position, is about 45 ° The roller 6 and the third roller 12 can be identically designed in order to be able to replace the worn roller by a new roller after the wear limit of one of the two rollers has been reached for longer periods, or the second and third rollers 6, 12 can be different and / or different tempered rollers act to produce a Unte to obtain a different treatment result of a web carried out between the first roll 2 and either the second roll 6 or the third roll 1 2.

The embodiment 100 further includes a fourth roller 16 which is mounted on the frame 1 by means of a second pivot lever 17. The second pivot lever 17 is mounted on the frame 1 via a second pivot axis 18 for this purpose. The second pivot lever 17 is in turn designed as a two-armed lever, in turn, on the opposite side of the fourth roller 16, a pivot drive 19 acts. The latter in turn comprises a linear drive with screw jack.

By pivoting the second pivot lever 17 by means of the pivot drive 19 about the second pivot axis 18, the fourth roller 1 6 between its parked position shown in Fig. 1 in the working position shown in Fig. 2, in which it forms a nip with the first roller 2 to be relocated. During the displacement, the fourth roller 16 is guided around the second roller 6 located in its parking position. In order to make this possible, the second pivoting lever 17 has a recess 20, into which the second roller 6 enter. protrudes when the fourth roller 16 is in its operating position shown in Fig. 2. In operation, the fourth roller 16 as well as the second and third rollers 6 and 12 are locked by means of the locking means 1 1, so that forces acting on the fourth roller 16 during operation substantially via the locking means 1 1 are introduced into the frame 1.

The fourth roller 16 may again be a replacement roller of the same type as the second and / or the third roller 6, 12. It is also possible to form the fourth roller 16 as rollers that are different or differently tempered from the second and third rollers 6, 12, in order to increase the treatment options that can be achieved with the calender.

Finally, the embodiment 100 comprises a fifth roller 21, which is formed on a further pivoting lever 22, which is mirror-image formed and arranged by the second pivot lever 17 and thus also referred to as "second pivot lever." This second pivot lever 22 is a second The pivot axis 23 can also be displaced between the rest position shown in Fig. 1 and the working position shown in Fig. 5 by means of a pivot drive 24 whose construction corresponds to that of the pivot drive 19. Again, the fifth roller 21 can be locked in its position by means of the locking means 11 Working position to be locked.

The fifth roller 21 may again be a replacement roller of identical construction with at least one of the second to fourth rollers 6, 12, 16, or a different or differently tempered roller. In the latter case, the various treatment options that can be achieved with the calender were further increased.

To move the fifth roller 21 when shifting between its parking position shown in Fig. 1 and its in Fig. 5, the pivoting lever 22 in turn comprises a recess 25 into which the third roller 12 located in its parking position protrudes when the fifth roller 21 is in its working position. The angle to which the second pivot lever respectively be pivoted to relocate the fourth and fifth roller between their parking and their working position, is about 90 °.

All pivot levers 5, 13, 17 and 22 are formed as a double-walled lever and engage around a bearing lug of the frame 1 on both sides. As a result, a very stable mounting of the respective pivot lever is achieved in the frame, which reliably prevents tilting of the pivot lever relative to the frame in a direction other than the pivoting movement. For each roller there is a pair of pivoting levers, each pivoting lever of a pair rotatably receiving the roller in one of its two end portions. In the drawing, only the swivel lever facing the viewer of a pair of swivel levers is recognizable. A material web to be treated with the aid of the calender according to the invention can therefore be passed between the two pivoting levers of a pair of swivel levers, and the web guide system shown schematically in FIG. 6 can thus be realized. In this example, supported by a screen belt 26, a web 27, for example in the form of a layer of filaments, the nip 28 formed between the first roller 2 and one of the second to fifth rollers 6, 12, 16, 21 and solidified in this. In nonwoven bonding, it is regularly advantageous if the web 27 leaves the nip 28 as possible without further contact with the rolls forming the nip, in order to avoid thermal damage, in particular of the areas not to be consolidated. It is also advantageous, the still unconsolidated goods fixed on a conveyor belt, formed in the embodiment described here as a screen belt 26 to bring as close to the nip, which is accomplished by the in Fig. 6, inlet side height offset h shown. The material web feed takes place almost parallel to the plane in which the nip lies (nip plane), so that the deflecting roller 26 'is only looped around by a small angle. Due to this measure, the risk that the product adheres to the screen belt 26 and breaks, is reduced. In the context of this document, the plane in which the nip lies (nip plane) is referred to in particular the plane perpendicular to the press plane of a nip. By suitable deflection rollers 29, in which - as shown in Fig. 6 - may be chill rolls, the web is fed in the forward direction V for further use.

LIST OF REFERENCE NUMBERS

100 embodiment

1 frame

2 first roller

3 sleds

4 piston / cylinder arrangement

5 first pivot lever

6 second roller

7 first pivot axis

8 rotary actuator

9 locking lever

10 piston / cylinder arrangement

1 1 locking means

12 third roller

13 pivot lever

14 first pivot axis

15 quarter turn actuator

16 fourth roller

17 second pivot lever

18 second pivot axis

19 quarter turn actuator

20 recess

21 fifth roller

22 swivel lever

23 pivot axis

24 quarter turn actuator

25 recess

26 screen belt

26 'deflecting roller

27 web

28 Nip

29 pulleys Forward direction height offset

Claims

claims:

1 . Calenders, in particular for textile, nonwoven, plastic or paper webs,

with a frame (1), in which a first roller (2), a second roller (6) and a third roller (12) are mounted, wherein the first roller (1) during operation of the calender either with the second roller (6 ) or with the third roller (12) forms a nip (28), to which the second roller (6) is displaceable between a working position in which it forms a nip (28) with the first roller (2) and a first parking position in that the third roller is displaceable between a working position in which it forms a nip with the first roller (2) and a second parking position,

characterized,

in that a device is provided for at least one fourth roller (16), which between a working position in which it forms a nip (28) with the first roller (2) and a third parking position without changing the parking positions of the second and third rollers ( 6, 12) is displaceable.

2. Calender according to claim 1, characterized in that a device for at least a fifth roller (21) is provided, which between a working position, in which it forms a nip (28) with the first roller (2), and a fourth parking position can be displaced without changing the parking positions of the second, third and fourth rollers (6, 12, 16).

3. calenders in particular for textile, nonwoven, plastic or paper webs,

with a frame (1), in which a first roller (2), a second roller (6) and a third roller (12) are mounted, wherein the first roller (1) during operation of the calender either with the second roller (6 ) or with the third roller (12) forms a nip (28), to which the second roller (6) is displaceable between a working position in which it forms a nip (28) with the first roller (2) and a first parking position , the third roller between one Working position in which it forms a nip with the first roller (2) and a second parking position is displaceable, in particular according to claim 1 or 2, characterized in that at least one of the second and third rollers (6, 12) via first pivot lever ( 5), which are pivotable about first pivot axes (7) pivotally mounted on the frame (1) are mounted on the frame (1), and at least a fourth and preferably fifth roller (16, 21) is provided, which via second pivot lever ( 17), which are articulated via second pivot axes (18) pivotally mounted on the frame (1) are mounted on the frame (1).

Calender according to claim 3, characterized in that the second pivot levers (17, 22) are formed such that at least one of the fourth or fifth roller (16, 21) when shifting between working and parking position to a second or third located in its parking position Roller (6, 12) is guided around.

Calender according to claim 3 or 4, characterized in that each of the first and second pivot levers (5, 13) is designed as a pair of pivot levers, wherein the two pivot levers of a pivot lever pair receive one of the second to fifth rollers at their ends.

Calender according to one of claims 3 to 5, characterized in that the pivot levers (5, 13) are designed as two-armed levers, in which on one side of the pivot axis (7, 14, 18, 23) the respective second to fifth rollers ( 6, 12, 16, 21) is arranged and on the other side a pivot drive (8, 15, 19, 24) engages.

Calender according to one of claims 4 to 6, characterized in that the second pivot levers (17, 22) have a recess (20, 25) into which a second or third roller (6, 12) located in its parking position protrudes when the fourth or fifth roller (16, 21) supported by the second pivoting lever (17, 22) is in its working position.

8. calender according to one of claims 1 to 7, characterized in that means for locking at least one of the second to fifth rollers (2, 12, 16, 21), in particular for locking the fourth and optionally fifth roller (16, 21) in their working position are provided.

9. calender according to one of claims 1 to 8, characterized in that the parking positions of the second to at least fourth roller (6, 12, 16) above the first by the first roller (2) and one of the second to at least fourth roller (6, 12, 16) formed nips (28) are arranged.

10. calender according to one of claims 1 to 9, characterized in that the first roller (2) is formed heatable and / or durchbiegesteuerbar.

1 1. Calender according to one of claims 1 to 10, characterized in that at least one of the second to fifth rollers (6, 12, 16, 21) are formed heatable and / or durchbiegesteuerbar.

12. calender according to one of claims 1 to 1 1, characterized in that rotary drive means for the second to at least fourth roller (6, 12, 16) are provided, with which these rollers are driven in their parking positions.