EP2070853A1 - Bridge for a corrugated cardboard system - Google Patents

Abstract

The bridge is arranged between a one-sided corrugated board machine i.e. single facer, and a pre-heating station. A reversal of direction takes place in a direction opposing a production process by a fixed guiding element (7). Another reversal of direction takes place back in a direction of the process around a fixed deflecting element (6). A rotatable deflecting roller (5) is arranged above the deflecting element in such a manner that a web running section running parallel to a rotation axis (5a) is formed. The roller is mounted in a rotating frame (5b) rotatable around a perpendicular axis.

Description

The present invention relates to a plant for the production of corrugated board and in particular the bridge of such a plant.

At the beginning of a corrugated board plant are referred to as "single facer" one-sided corrugated board machines in which a smooth web is brought together with a brought between two heated corrugating rollers in a corrugated web and glued to a single-sided path. To produce a duplex corrugated board, composed of a smooth surface cover, a wave, a smooth false ceiling, a second wave and the back surface cover two sequentially arranged single facer are required, the one-sided webs are glued in a further manufacturing step and with a cover sheet , The unilateral web slides from the single facer farther away from the bonding station via a table which is arranged above the course of the path coming from the closer single facer. For the production of triplex corrugated cardboard, the supply of three single-sided webs takes place in three superimposed floors. To prepare the bond, each unilateral web passes through a preheating station assigned to it.

The bridge of a corrugated board plant is a station arranged between the single facers and the preheaters with the running one-sided tracks on their way supporting floor-by-floor arranged tables, wherein the gliding from the more distant single facer one-sided tracks in a long straight extension, while the lowest one-sided path from the nearby single facer on their short lower table is pushed together to waves and loops and thus forms a stored track stock.

At the end of the bridge a control device is provided for each one-sided web to achieve good quality and reduce edge drop, which on the one hand bring the tensile forces acting in the single-sided corrugated webs to a preset value and keep constant, and on the other hand the position of the unilateral webs centered Align the system and hold it in this position. In this way, unevenness in the position of the single-sided corrugated cardboard, which inter alia arise through the storage process, is compensated for again and a constant web tension is produced for the following preheating.

For the regulation of the lateral position as well as the regulation of the web tension of the single-sided corrugated webs various constructions are used today in practice. In particular, both tasks solving combination devices are popular because they are very compact.

In DE 39 10 548 / Niemann 1990 / Such a combination device is described, which combines a rotating frame with a braking device for Bahnzugserhöhung. The principle of the underlying rotating frame for controlling the lateral position of running webs was in an early version already in the patent US 3,326,435 / Shelton 1967 / described. Below is one Device including the braking device briefly referred to with a rotary frame (displacement frame).
In a brochure from the company FIFE / Fife-Tidland 2006 / another combination device is shown, which also combines a control roller (also known as Kamber roller) with a braking device for Bahnzugserhöhung. The underlying Kamberoller was already in DE 1093 315 / Leimer & Mack 1960 / assumed to be known and in US 2,797,091 / Fife 1957 / described in a very early form. In the following, this device including the brake device will be referred to briefly as a steering frame.

Both solutions have disadvantages. The solution with the rotary frame according to Niemann 1990 only allows an effect of the regulation in the direction of the web outlet. In addition, the path correction capability of such a device by mechanical constraints is often limited so that it is not always sufficient for the application considered here. Another disadvantage is the fact that in the solution with the rotating frame for a certain correction of the web run a greater angular adjustment of the rollers is necessary, as it would be necessary in comparison for a device according to Fife-Tidland 2006. However, the angle of the last roller in the rotating frame determines the web tension distribution in the outlet of the rotating frame and thus also in the subsequent preheating. The greater the correction of the web run, the more the angle of the last roller in the rotating frame deviates from the right angle with respect to the direction of production, and the more uneven the web tension distribution.

To compensate often additional constructions as in EP 0 722 899 / Niemann & Wulf 1996 / described used to to improve the web tension distribution for preheating again. Furthermore, often in such systems in addition to the rotating frame still a feedforward EP 0 519 261 / Niemann & Wulf 1992 / used. As a result, the web run can also be influenced on the bridge itself and the limitation of the possibility of correction by the rotating frame itself is canceled.

The solution with the control frame according to / Fife-Tidland 2006 / has the advantage that the path correction not only acts in the outlet, but is also observed in the inlet and thus on the bridge itself. Furthermore, the angular displacement of the rollers is lower, so that the web tension distribution in the outlet is more uniform than in the solution according to Niemann 1990th This is the more the case, the smoother the table surfaces of the bridge are executed, because under such conditions, the place of the strongest shifts Railway bend furthest in front of the control frame. It is therefore generally possible to dispense with additional equipment according to Niemann & Wulf 1992.

For the upper one-sided corrugated board webs, this solution always works perfectly, since the feed to the control frame has a sufficiently long extent. In the lowermost single-faced corrugated web, considerable difficulties often arise in the design of the system and commissioning. In order to achieve the necessary length for the web feed, web deflections are usually installed so that a folded web run with two opposing deflections results. The per se advantageous effect of the solution according to Fife-Tidland 2006, also acting on the position of the web in the feed, leads to these web deflections to interactions with the web, which can generate additional position errors of considerable magnitude.

Based on the known after Fife-Tidland 2006 training a bridge corrugated cardboard plant, the invention has for its object to improve the running of the lower single-sided corrugated board so that a safe system planning and easy commissioning is achieved.

As in the known training, the lowermost of the one-sided tracks forms a loosely stored stored web supply and is supplied from this under two-way reversal direction reversal a braking roller having a control frame, wherein the first direction reversal takes place in the opposite direction of the manufacturing process via a fixed guide element. According to the invention, the second reversal of direction takes place back in the direction of the production process in two stages, wherein initially a deflection takes place about a fixed deflecting element in a vertically upward movement and above this fixed deflecting a pivotable about a vertical axis deflecting roller is provided, over which the web the second deflection stage experiences in the direction of its control frame, in which it wraps around the pivotable guide roller only by about 90 degrees.

In this embodiment, the pivotable guide roller can automatically or controlled parallel to the rollers of the subsequent control frame set and it arises between the fixed deflecting element and the controllable guide roller extending parallel to the pivot axis trajectory section, the only at the pivoting adjustments is twisted and thus not exposed to unilateral tensile stresses, which are ultimately responsible for the undesirable reactions at the Bahnumlenkungen.

The braking device used to control the web tension on the section behind the control frame to the preheater needs a minimum train in the inlet, so that friction can take effect and the braking effect can be effective. If this minimum train is undershot, then the web slides over the stationary brake roller and a regulation of the train is no longer possible. The proposed guidance of the web at the second deflection provides sufficient resistance to generate the required web tension. In addition, in this web guide, the variations in the web tension caused by the Entschlaufungsprozess the corrugated cardboard web during removal from the stored stock, attenuated. The freely suspended between the first and second deflection portion of the single-sided corrugated web ensures its up and down movement for a partial compensation of Bahnzugschwankungen due to the Entschlaufungsprozesses.

In the simplest embodiment of the invention, the pivotable guide roller is freely pivotable and is brought only by the corrugated board itself in the correct position and held there. In this case, first, the pivot axis of the guide roller plant to be arranged centrally and secondly, the control frame is to be executed or set so that the center of its translation-rotational movement path coincides approximately with the pivot axis of the pivotable guide roller.

To ensure safe operation and also to facilitate the threading of the web stops are advantageously provided, which limit the pivot angle of the pivotal roller so that it can not be much larger than the pivot angle of the control rollers.

In a further development of the invention, the pivotable guide roller is also free to pivot and is brought only by the corrugated board itself in the correct position and held there, but in addition measures to increase the friction between the corrugated board and the roller are applied, for example, a plasma coating or plastic coating the roll surface. Likewise, the roll can be wrapped with specially prepared adhesive tapes.

In another embodiment, the pivotable guide roller is in turn freely pivotable and is brought only by the corrugated board itself in the correct position and held there; In addition, however, the roller surface is designed by a rotation axis parallel structuring so that the running over this surface shaft side of the single-sided corrugated board web finds particularly good support to produce a certain positive fit. For example, a structuring can be used which has a negative height profile to the corrugated cardboard and thus creates a toothing.

In a further development, the pivotable guide roller is connected by traction cables with the control frame so that the actuating forces no longer need to be transmitted from the corrugated web, but are transmitted by these traction cables.

In a further embodiment, the pivotable guide roller is to be adjusted by means of a motor drive and by electronic means, this drive should be controlled so that the guide roller is oriented parallel to the rollers of the control frame. This is to be equipped with a sensor for its current position (angular position). If in the following, for simplification, only angular encoders are used, a sensor is meant in the sense mentioned here.

In one embodiment of the embodiment with a motor drive of the pivotable guide roller this is controlled by electronic and control engineering means so that the control frame with the braking device always works as possible in its center position. To solve this problem, a second controller is additionally used, which corrects their angle again by a certain degree, starting from a pivotable deflection roller set at the same angle. Since the reaction of the control frame to an angular change of the pivotable guide roller in practice does not occur immediately and the response delay is dependent on the speed of the corrugated web, should be used for the second controller, the known solutions in which the control behavior is influenced by the web speed. A well-known method is in DE 33 04 799 / Dingerkus 1983 / described and it can be used instead of the measuring devices used there for the web position here angle sensors. A signal limiter following the second regulator should limit the additional angular adjustment to the degree tolerated by the corrugated board web.

Finally, in a further development of the pivotable guide roller, a wrap-around angle-increasing twin roller can be arranged directly downstream, so that an increase in the frictional engagement results in this way.

• Fig. 1 den Abschnitt einer Wellpappeanlage zur Herstellung von Duplex-Wellpappe zwischen den single facer-Stationen und dem Auslauf zur Verklebungsstation;
• Fig. 2 den oberen Teil der Brücke mit dem Verlauf der beiden einseitigen Wellpappebahnen;
• Fig. 3 schematisch eine Draufsicht auf die untere Etage der Brücke;
• Fig. 4 eine Ausbildungsform der schwenkbaren Umlenkwalze;
• Fig. 5 eine schwenkbare Umlenkwalze mit nachgeordneter Zwillingswalze;
• Fig. 6 die Draufsicht gemäß Fig. 3 mit mechanischer Kopplung von schwenkbarer Umlenkwalze und zugehörigem Steuerrahmen;
• Fig. 7 eine elektrisch-elektronische Winkelstellungskopplung von schwenkbarer Umlenkwalze und zugehörigem Steuerrahmen;
• Fig. 8 die Ausbildung gemäß Fig. 7 mit zusätzlichen Gliedern.

The invention will be further explained by the description of embodiments with reference to the accompanying drawings. It shows:

• Fig. 1 the section of a corrugated cardboard plant for the production of duplex corrugated board between the single facer stations and the outlet to the gluing station;
• Fig. 2 the upper part of the bridge with the course of the two single-sided corrugated board webs;
• Fig. 3 schematically a plan view of the lower floor of the bridge;
• Fig. 4 an embodiment of the pivotable guide roller;
• Fig. 5 a pivotable guide roller with a downstream twin roller;
• Fig. 6 the top view according to Fig. 3 with mechanical coupling of pivoting guide roller and associated control frame;
• Fig. 7 an electric-electronic angular position coupling of pivotable guide roller and associated control frame;
• Fig. 8 the training according to Fig. 7 with additional links.

The one-sided corrugated board of the further removed single facer coming from the stored web supply from the next single-sided web 1 slides in the upper floor via a table not provided with reference to their control frame 3 and further into the preheating station 34, where it wraps around the uppermost heated drum and is heated to prepare for subsequent bonding. It then passes through the gluing unit 36, in which the crests of its shaft receive a glue application, and from here to the merging station 38 of the gluing machine.

The unilateral web 2 of the nearby single facer from the intermediate deck of the manufactured duplex corrugated cardboard and its glued shaft pushes to the stored web supply 8 together, wherein at full filling of the memory, as in Fig. 1 it can be seen, a stop 9 is reached. In a manner to be described in more detail below, this lower unilateral web 2 passes to its lower control frame 4 and from here in the same way through the preheating station 34 and the gluing unit 36 to the merging station 38.

Under the bridge is the dispenser 32 for the other outer deck track 30, which also wraps around a heated drum in the preheating and from here to the merge station 38, where the finished structure of the duplex corrugated board is formed.

Fig. 2 shows more details, in which case the memory with the web supply 8 is not completely filled. The control frame 4 is in response to the signals of a lighting 4e having measuring device 4d for Track position determination adjusted transversely to the direction of production on a translation-rotation trajectory and guided by bearings 4f. The center of this trajectory is at 5a.

The control frame 4 includes two control rollers 4a and 4c and between these offset a brake roller 4b, which opposes their rotation by means of a brake, not shown, a braking torque. It is important that when the web enters the control frame in it a minimum tensile force acts, so that it comes to a frictional engagement with the brake roller 4b and this can develop their braking effect.

On its way from the web supply 8 to the control frame 4, a first reversal of direction from the direction of progress of the production in the opposite direction via a fixed guide element 7, which is more or less wrapped depending on the degree of filling of the web storage memory 8 or only supporting acts. From here, the web runs in loose, irregular in operation up and down waves dancing to a fixed deflecting element 6, via which the web is deflected in a vertically upwardly directed track course section.

Above the fixed deflecting element 6, a deflection roller 5 which is pivotable about a central vertical pivot axis 5a is arranged. This is mounted between the cheeks of a pivoting frame 5b and the axis of rotation of the pivotable guide roller 5 is offset relative to the pivot axis 5a by an amount to the control frame 4 out. Its translation-rotation trajectory has the center approximately coinciding with the pivot axis 5a, and because of the offset, the pivotal movement of the pivotable guide roller 5 is not a pure rotation about one vertical axis but a pendulum movement short pendulum length.

The fixed guide member 7 is preferably a fixedly mounted roller, but may also be an immovable rod depending on the circumstances. The fixed deflection element 6 is preferably an immovable rod, but may be more advantageous under certain circumstances, a fixed rotatable deflection roller.

In the simplest case, the pivotable guide roller 5 is completely free to pivot, so that it is only pulled from the running Bahntrum to the control frame 4 in a pivotal position in which it is aligned parallel to the rollers. If the effect does not occur with sufficient certainty, the coefficient of friction of the roll surface can be increased by suitable means, or the surface can be corrugated in the direction of the surface lines, for instance in correspondence with the wave of the unilateral web 2 passing over it, so that a kind of positive engagement results like this in Fig. 4 is illustrated. Another possible option is, according to Fig. 5 the pivotable guide roller 5.1 immediately after a twin roll 5.2, which increases the wrap angle of the upstream roller 5.1.

It is also possible to enforce the pivoting of the pivotable guide roller with mechanical or electrical / electronic means. Fig. 6 shows how, for example, the pivotable guide roller 5 can be connected by means of tension members 10 with the control frame 4.

In Fig. 7 is also 4h operated in response to the signals of the Seitenlagemeßvorrichtung 4e / 4d actuator 4h of the control frame 4 and this additionally has a Winkelpositionsmeßfühler 4g, the signals of which are fed to the first input of a summing node 20a. Its second input is acted upon by the signals of an angle sensor 5c of the pivotable guide roller 5 and the difference resulting from the signal to a controller 20b, which controls a motor driver 20 c acting on the pivot frame 5b servomotor 5d so that the pivotable guide roller 5 follows the pivoting movements of the control frame 4 and its rollers.

According to Fig. 8 the summation node 20a is additionally supplied via a second controller 20d a signal formed from the web speed v _orbit and angular position φ of the control frame and a limiter 20e, the resulting additional angular adjustment to a for the Restricted use case acceptable level, the summing node 20a is applied. The signal obtained in the second controller 20d from the control frame angular position signal and the speed signal takes into account the web speed-dependent deceleration of the reaction of the control frame to an angular change of the pivotable deflection roller, as indicated above as an advantageous development.

Using the invention, the establishment and commissioning of a corrugated cardboard plant succeeds with much less labor and time and it is achieved a more stable operation of the system.

LIST OF REFERENCE NUMBERS

1

upper one-sided corrugated board

2

lower one-sided corrugated board

3

upper control frame

4

lower tax framework

4a

control roller

4b

braking roller

4c

control roller

4d

measuring device

4e

Illumination of the measuring device

4f

overlays

4g

Winkelpositionsmeßfühler

4h

servomotor

5

swiveling deflecting roller

5a

Pivot axis of the pivotable guide roller 5; Center of the translation-rotation trajectory of the control frame 4

5b

pivoting frame

5c

angle sensor

5d

servomotor

6

fixed deflecting element

7

solid guide element

8th

saved web stock

9

memory stop

10

tension elements

20a

summing

20b

regulator

20c

motor driver

20d

second controller

20e

limiter

30

Outer liner

32

Dispenser of the outer deck track

34

preheating

36

gluing unit

38

Assembly station

Claims (12)

Bridge of a corrugated cardboard plant, in which one or more of one or more single-sided corrugated board machine (s) (single facer) tapered one-sided corrugated board webs (1, 2) controlled and braked to produce a desired web tensile force of the preheating (34) is / are supplied .
wherein the lowermost (2) of the unilateral webs forms a loosely stored stored web supply (8) and is supplied by the latter under twice the opposite direction reversal to a control frame (4) having a brake drum (4b),
and wherein the first direction reversal takes place in the direction opposite to the manufacturing process via a fixed guide element (7),
characterized in that the second reversal of direction takes place back in the direction of the manufacturing process to a fixed deflecting element (6) and a deflection roller (5) arranged above the same, that a trajectory section extending parallel to the pivot axis (5a) is formed,
and that the deflecting roller (5) is mounted in a frame (5b) pivotable about a vertical axis (5a). Bridge according to claim 1, characterized in that the axis of rotation of the pivotable deflection roller (5) is offset with respect to its pivot axis (5a) in the direction of the production process. Bridge according to claim 1 or 2, characterized in that the fixed guide element (7) and / or the fixed deflection element (6) is a fixed deflection bar. Bridge according to claim 1 or 2, characterized in that the fixed guide element (7) and / or the fixed deflecting element (6) is a fixedly mounted roller. Bridge according to one or more of the preceding claims, characterized by a friction-increasing coating of the pivotable deflection roller (5). Bridge according to one or more of the preceding claims, characterized by a structured surface of the pivotable deflection roller (5) corresponding to the wave path of the unilateral web (2) running over it. Bridge according to one or more of the preceding claims, characterized by a mechanical pivotal movement connection between the pivotable guide roller (5) and the subsequent control frame (4). Bridge according to claim 7, characterized in that the mechanical pivotal movement connection is made by means of tension elements (10). Bridge according to one or more of claims 1 to 6, characterized by a servomotor pivot drive (5d) of the pivotable guide roller (5), which is controlled by signals of a Winkelpositionsmeßfühlers (4g) of the associated control frame (4) such that the pivot position of the pivotable Guide roller (5) of the control frame (4) follows. Bridge according to Claim 9, characterized by an angular position sensor (5c) of the pivotable deflection roller (5) whose signal is combined with the signal from the angular position sensor (4g) of the associated control frame (4) in a summing node (20a) for obtaining the control signal for the servomotor (5d ) is processed. A bridge according to claim 10, characterized in that a correction signal is obtained from a third input of the summing node (20a) obtained from the signal of the angular position sensor (4g) and a signal derived from the speed of the single-sided corrugated board web (2). Bridge according to one or more of the preceding claims, characterized in that the pivotable deflection roller (5.1) is arranged downstream of a twin roller (5.2) which increases its angle of wrap.

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