EP2147880A2 - Method for changing rollers in a roll up device and device for carrying out the method - Google Patents

Abstract

The method involves bringing sequence rollers (8) from a storage into a winding position (2a) by a crane (4). Positions of the rollers are continuously or discretely temporarily detected before obtaining the winding position. An exchange of the rollers is controlled and/or regulated. Data e.g. position value, are used to control collision of the rollers. Signals are used to take temporarily influence on freedom of movement, and/or transport speed and/or transport unit. Movements of the rollers are guided considering a movement free space (12). An independent claim is also included for a device for winding a material web i.e. paper web.

Description

The invention relates to a method for changing roles in a winding device having at least one winding position, in which a following roll is transported by means of a transport unit from a storage in the winding position. The invention further relates to a device for carrying out the method.

The invention will be described below with reference to a paper web as an example of a material web. However, it is also applicable to other material webs that can be handled in a similar way. Furthermore, the winding device will be described with reference to a development in a slitter-winder. However, the invention is also applicable to other winding devices in which rollers within a winding station assume a winding position and are changed. It is therefore to be understood that the invention also encompasses methods for changing roles at take-up positions.
Under an exchange role is understood in the following, that role that is still in the winding position of a winding station at the beginning of the change process and is replaced during the change process by a roller, which is referred to here as a follower role.
In order to make the production process of paper production as efficient as possible, efforts are being made to produce paper webs as wide as possible at as high a speed as possible. The resulting paper webs are wound on hubs for further processing in the paper mill, or for transport outside the home.
Under rolls, the present specification understands all rotatable production means used in paper production, paper finishing and paper processing, ie Paper web rolls and their winding cores, in particular full reels and finished rolls or empty reeds and sleeves.

Under a means that can detect the position of the follower role at least temporarily understands the present document optical, acoustic, electromagnetic sensors, their actuator, and buttons, probes, gauges and image-generating devices.

A full tambour created in the reeling at the end of the paper machine can reach large diameters today, with web widths of up to 10.5 m to be wound, depending on the type of paper. For newsprint, for example, diameters are wound around 3 m, for heavy paper or cardboard even up to 4.5 m. In contrast, only smaller roll diameters are achieved with more sensitive paper grades.

For transport outside the home and to enable a manageable further processing, for example in printing presses, the paper webs are cut in so-called slitters in the longitudinal direction. Two types of slitter-winder are known, the sling-roll cutting machines in which the individual, resulting finished rolls are wound in a common winding bed, and the back-up roll cutting machines, which have their own winding station for each finished roll to be produced. However, both genera basically have the same conditions for settlement. The same applies to so-called transfer or doctor scooters, whose task is the rollover of full drums, and where occasionally a trim can be performed. For the object of the invention, it is therefore irrelevant whether it is a settlement in a carrier roll cutting machine, a back-up roll cutting machine or simply a so-called rewind or doctor wrapper.

For equipping the settlement of the mentioned types of machines with the resulting at the end of the paper machine Volltambouren means of transport are needed. Often this is accomplished by means of cranes, as elegant rail transport systems with their own conveyor stations are very expensive due to their complex mechanics and must be adapted to the new conditions, for example, when replacing a slitter. Usually between paper machine and slitter a bearing, in particular a spool magazine, interposed, which serves to compensate for production differences. These differences in production already occur inevitably because the paper machine is operating continuously and the slitter-winder discontinuously. Furthermore, speed differences as well as planned and unscheduled stoppages can be partially compensated in this way. Nevertheless, the role of slitting machines in maintaining the process speed of papermaking is very important, since the slitters must definitely be able to process the entire amount of paper delivered by the paper machine so that production stoppages in the papermaking process can not occur.

In order to replace a unwound in the development of the slitter Volltambour or the remaining, possibly still stocked with remnants, winding core by a full spool, which is located in the winding position reel spool or winding core must come to a standstill, unlocked and removed become. Furthermore, a means of transport must be a subsequent full tambour from a warehouse, in particular a reel magazine, dig out and in a position near the winding position, here called Vorposition, proceed where the below-mentioned oscillations must calm down before the spool can be spent in the free winding position and locked there. Only then can the unwinding process begin again.

According to the prior art, the success of the change process depends very much on the ability of the operator to coordinate the two movements properly. Thus, if a machine operator tries to move the newly inserted reel to the pre-position above the reeling position, while the reel to be replaced still rotates in the coiler station, he must rely on his own judgment. Due to structural conditions and frequently existing containment of the settlement as well as the fact that a full or empty bobbin on a crane represents a pendulum mass under the influence of speed changes, such a procedure involves a considerable risk of collision and is the strictest in almost all paper mills to avoid consequential accidents prohibited. Accordingly, according to the prior art, the described movements of the paper web rolls or winding cores involved in the changing process are largely separated one after the other, which inevitably leads to a relatively long standstill of the slitter-winder.

The object of the invention is to shorten the change process of roles at a winding position in time and make it safer.

This object is achieved in a method of the type mentioned in the present invention that at least one agent available is that the position of the follower role, or a vulnerable portion thereof, at least temporarily recorded before reaching the winding position.

In this way, the operator of such a device is possible to significantly reduce the time required for the change of roles, since the change can already be initiated during ongoing processing. This additionally increases the security of the change process.

In an advantageous variant, the position of the follower roller can be detected continuously with the method according to the invention. The data thus obtained provide an ideal basis for operating the change process and allow a particularly high level of safety, since the position of the role is not only determined at significant points of the change process, but the path of the roles, at least in sections, continuously monitored.

In contrast, a variant of the method can be of great practical importance, which detects the position of the follower roll at intervals. Such a procedure can already guarantee an absolutely sufficient degree of security. Also, the means for detecting the position of the follower roller to be provided therefor on a winding device can be easily attached at a suitable location.

The abovementioned method variants also make it possible for the position of the follower roller to be recorded accompanying at least one predefined route section.

In this case, a method according to the invention allows for design variants according to which the change process is controlled or regulated.
In addition to the basic possibility that the at least one means for activating perceptible signals to the operator, in particular procedures are provided which provide the electronic processing of the detected parameters and allow in particularly preferred variants, a user-free or largely operator-free operation.
This allows for particularly short system response times and eliminates human error. In addition, a high reproducibility of the processes is guaranteed. Further advantages result from the electronic links of surrounding control systems, for example, an upstream Tambourcharakterisierung or monitoring units for the production speed before or nachgestelltter processing stations, as well as with higher-level control systems, such as the overall monitoring of incoming or imminent business interruptions. In addition, a worker can be largely exempted from the potential danger area.

In a further preferred method, the acquired data, in particular position values, are used to avoid a collision of the roles to be changed. In this way expensive production losses can be avoided and the integrity of the rolls guaranteed. Finally, a source of danger for man and machine is eliminated.

Furthermore, a method according to the invention can be configured particularly advantageously if the acquired data, in particular position values, are used to shorten the change process in terms of time. This is especially in terms of boosting the Process performance is important and is possible because you can waive on the basis of the collected data on then redundant safety instructions, such as above-described retention periods in waiting positions outside the settlement. By a method according to the invention, it is possible to bring the follower roller close to the winding position with still rotating in the winding position changing role. In particular, this makes it possible to spend the following role in a pre-position, which is preferably above the winding position. Here, the follower roller may already settle in case of any pendulum movements and must be lowered after ejection of the change role from the winding position only in this.

In a method according to the invention, the at least one means can advantageously activate signals which are used to influence at least one degree of freedom and / or the transport speed of the following roller and / or its transport unit at least intermittently.
In particular, the signal can be used to stop the transport movement of the follower roller on its way to the winding position or at least to influence in certain directions, such as forward, backward, up, down, about to lock or release again, or to delay or accelerate.
In this way, the following role can be spent in the winding position, avoiding possible collision hazards in a safe and rapid manner. Furthermore, due to the existing signaling, a creeping speed can be assumed immediately before reaching the winding position, in order to introduce the follower roll particularly gently into the winding position.

Furthermore, a method according to the invention is advantageously designed if the follower roller is introduced into the winding position while maintaining previously defined safety distances.
For this purpose, the safety distances can be programmed machine-bound and leave the operator a certain choice in the determination of the set safety distances case by case. In addition, it is conceivable that safety distances against moving parts, in particular against the still rotating and / or even from the winding position removing exchange roller, are greater than the safety distances against dormant components. In general, the use of defined safety distances results in an increase in collision safety and, with a suitable choice, allows a higher tolerance of other functional sequences.

Furthermore, the respective orientation of the at least one agent in space may be invariable or at least temporarily changeable. Here, depending on the structural condition of the winding device in their orientation invariably designed means for detecting the position or the position of the follower roll a particularly price-oriented solution, since the components required for this are in themselves inexpensive and no additional structural measures are required. In addition, no complex software is required for signal processing of such components. In other cases, the wishes of the operators of such winding devices, or the framework conditions, in particular the structural conditions can be such that the use of at least temporarily changeable means is required.
Preferably, at least temporarily changeable means for detecting the position or the position of the follower roll during the change process or before it can be moved and / or rotated and / or pivoted in its orientation.

In addition, such funds can be easily adapted to changing circumstances. Likewise, it is conceivable that the orientation of the at least one means of fulfilling the tasks set can be changed, in particular on the basis of structural conditions. In this way, the effectiveness of individual funds can be significantly increased and the task of continuous monitoring can be met in a particularly good manner.

It is advantageous if, in the presence of multiple agents, the orientation of at least two agents differs. In this way it is possible to monitor the space in more than one dimension. In particular, it is thus also possible to create security gaps and / or security rooms in any desired position in the room.

It is particularly advantageous if at least one means substantially in the machine direction and at least one means is oriented substantially transversely to the machine direction in order to generate a high degree of security in a simple manner.

Preferably, optical, acoustic or electromagnetic devices are used as means for detecting the position or position of the follower roll.
In an optical device imaging devices, light or laser sensors, in the acoustic devices ultrasonic, infrasound, in the electromagnetic devices radar or microwave sensors are preferred. In this case, a light or laser device offers the advantages of particularly inexpensive components, simple processing software and the possibility of visible functional verification. An optical device generally offers the advantage of high focusability of the objects to be monitored. In addition, image-forming devices, in particular cameras, offer the advantage that the detection of the object, in this case the follow-on role, is particularly meaningful, and provides a particularly well-founded basis for monitoring, and in particular an associated controlling or regulating intervention.
On the other hand, an acoustic device can be designed such that the sensor is simultaneously the receiver. This can be of great advantage under certain structural conditions. Since the sound waves propagate in space, it is also conceivable that an acoustic device is used in a suitable manner for direct distance measurement, in particular between the moving parts, in particular between the rollers involved in the change.
When using electromagnetic sensors, on the other hand, the material differences of the components to be monitored, such as the wound paper web and the surrounding steel machine components, can be exploited particularly well, since in addition to their density, their electronic and magnetic conductivity also influence the resonance behavior used for the detection. Irrespective of the type of sensor, with appropriate sensor alignment and signal processing, indications are given of the movement speeds of the rollers involved in the change.

In a particularly preferred application of a method according to the invention, the winding device is a slitter-winder, since the slitter-cutting machines are of great importance with regard to maintaining the process speed of papermaking. After deducting buffer capacity, the process capacity of the slitter must be at least as high as that of the Paper machine, which is why a time saving at the roll change here is of particular importance.

In a very particularly preferred application of a method according to the invention, the winding position is an unwinding position. This is particularly advantageous in a slitter-winder, since the change of bobbin, due to the high masses to be moved, generally lasts longer than the change of the partial-web rolls involved in the winding.

According to the device, the above-described object is achieved in that means are provided which are suitable to detect a freedom of movement for the follower roller on its way to the winding position. It is understood as a freedom of movement of that area in which the follower roller on its way to the winding position is movable without collision, it is not important whether the freedom of movement is closed, or at least one side open. For example, a movement clearance can also be understood as the area located above a, for example inclined or curved, plane.
Such a device provides excellent conditions for a fast and safe change of roles at a winding position.

If the freedom of movement is detected, for example, by means of an image-forming device or sensors and actuators, then it is an imaginary freedom of movement which preferably takes effect in conjunction with a suitable control unit which at least indirectly has at least one degree of freedom and / or transport speed Following role and / or their transport unit at least temporarily influence can. It can be taken into account by the provided freedom of movement already desired safety distances. In this way, the device of the underlying task is particularly well.

In particularly preferred exemplary embodiments, the means detecting the follower roller can be movable, displaceable, rotatable and / or pivotable for detecting the movement clearance. The freedom of movement can thus be unchangeable or changeable over the period of movement of the follower roller. As a rule, a freedom of movement will be clearly definable on a winding device and can thus be formed unchangeable. A variable range of motion is to take account of any incidents beneficial. When using imaging devices, it is conceivable that in addition to the follower role, other parts are detected, the possible layers can restrict the freedom of movement of the follower role at least temporarily.

Further features and advantages will become apparent from the dependent claims in conjunction with the description and the drawings.

Figur 1

eine schematische Darstellung eines erfindungsgemäßen Verfahrens anhand einer entsprechend eingerichteten Abwicklung, wobei sich die Folgerolle in einer Warteposition außerhalb der Abwicklung befindet

Figur 2

dasselbe Verfahren, wobei die Folgerolle in die Abwicklung eingebracht wird und einen durch einen Sensor vorgegebenen Sicherheitsabstand erreicht hat

Figur 3

dasselbe Verfahren, wobei die Folgerolle ihre Vorposition oberhalb der Wickelposition erreicht hat

Figur 4

eine schematische Darstellung einer erfindungsgemäßen Vorrichtung mit zwei bilderzeugenden Einrichtungen zur Überwachung der Folgerolle und in einem Rechner hinterlegtem Datensatz, der einen Bewegungsfreiraum für die Folgerolle definiert

The invention is explained in more detail below by means of exemplary embodiment with reference to the drawings. Showing:

FIG. 1

a schematic representation of a method according to the invention with reference to a suitably arranged settlement, with the follower role is in a waiting position outside the settlement

FIG. 2

the same method, wherein the following role is introduced into the settlement and has reached a predetermined by a sensor safety distance

FIG. 3

the same method, wherein the follower roller has reached its preposition above the winding position

FIG. 4

a schematic representation of a device according to the invention with two imaging devices for monitoring the follower role and stored in a computer record that defines a space for movement of the follower role

In the FIGS. 1 to 3 a device for carrying out the method according to the invention is shown with reference to a development (1). To simplify matters, a coordinate system has been entered in the lower right-hand screen area. Its x-axis points in the machine direction, the y-direction indicates the transverse direction, ie the width of the system, while the height is in the z-direction.

In the winding station (2) rotates an exchange roller (7) in its winding position (2a), wherein continuously web of material (9) unwound from it and the connected processing station, such as a cutting section, not shown, is supplied. On a housing component at or near the winding station (2), a first sensor (6) is mounted, which is aligned opposite to the machine direction (x) in the example shown. If the change roller (7) located in the winding position (2a) now falls below a predefined diameter due to the unwinding process described above, the sensor (6) can be optical, acoustic or electromagnetic Signal received. It is irrelevant whether the sensor (6) also acts as an actuator or receives the signal from a suitably positioned, corresponding actuator.

In the present example, the sensor (6) now outputs an enable signal which is forwarded directly to a computer unit, not shown, which can indirectly or directly influence the transport movement of the follower roller (8) and initiates the transport of the follower roller (8) , It is not important for the inventive method, if the follower roller (8) is then taken from an upstream, not shown storage or has already been in a waiting position (10) in the machine direction (x) outside the settlement, but at least in front of a sensor (5).

The second sensor (5) is aligned here in the transverse direction (y), so that a kind of hurdle arises for the following roller (8) to be moved to the winding position (2a). Detects the sensor (5) the follower roller on your way to a in FIG. 3 illustrated pre-position (11) above the winding position (2a) are immediately blocked forward and downward movements. The transport unit of the follower roller (8), here the crane (4) is then only able to perform backward and / or upward movements until the sensor (5) the path in the direction of winding station (2) again releases. In this case, the position of the second sensor (5) is adjusted so that there is a safety distance (s) in the z-direction between the rollers (7, 8) involved in the change process. Depending on the exemplary embodiment, this safety distance (s) can be adapted to the fact that the diameter of the interchangeable roller (7) continues to decrease from the sensor (5) to the pre-position (11) during the transport time of the follower roller (8). In an extreme example, it may thus be possible for the sensor (5) to be mounted in the vertical direction (z) below the sensor (6).

It is obvious that it is also within the scope of the invention to provide further sensors which are suitable for detecting the position of the follower roller, but at least other endangered sections of the follower rollers. In particular, when using, on stationary rails running transport, especially cranes that largely rule out a deviation of the transport path in the y direction, sensors can also be used, which are particularly suitable for determining the position with respect to the z-axis. In this case, for example, particularly inexpensive solutions can provide a tactile or sensing device here. Such a device may, in cooperation with a corresponding control or regulating device, provide for a lowering of the follower roller superimposed on the forward movement until the follower roller no longer touches the tactile or sensing device.

Likewise, it goes without saying that the appropriate positioning of the means may also include a positioning on the transport means of the following roller.

In this way, a safe movement of the follower roller (8) in a pre-position (11), which is here occupy above the winding position (2a), guaranteed. In the pre-position (11), the following roller (8) can calm down. In parallel, the rotational movement of the change roller (7) can be delayed and the change roller (7) can be removed from the winding position (2a). The follower roller (8) located in the pre-position (11), including the safety distance (s) to be bridged, only has to overcome a small path to the winding position (2a). Preferably, the follower roller (8) is moved downwards substantially only substantially perpendicular to the winding position (2a) and arrested there. The short path takes very little time, so that the entire change process is significantly shortened.
Practical tests have shown that an otherwise usual roll change on the unwinding of a slitter rewinder at a master roll width of about 8 m can result in a total time savings in reel changes of more than one minute. When processing commercially available newsprint papers, the standard for changing rolls on a slitter rewinder is about one change operation per hour. If each change now takes about 1 minute less time and is produced around the clock, the time saved is about 24 minutes a day. This means that about a third to a half roll can be processed per day. In order to achieve the same performance increase through higher production speeds, the production speeds of today's slitter winder would have to be increased in the continuous load range by approximately 100 meters per minute, which would entail a not inconsiderable increase in the annual energy requirement.

Another advantage of the short insertion path, from the pre-position (11) to the winding position (2a) is that the follower roller (8) can be introduced very slowly and therefore gently into the winding position (2a). It may be particularly advantageous if, in the immediate vicinity of the winding position (2a), a further sensor can delay the introduction speed of the follower roller (8) after its detection.

If the following roll has assumed the winding position (2a), it can continue to be produced and the following roll becomes the replacement roll in the next change process.

This in FIG. 4 illustrated embodiment of a device according to the invention shows in the left part of the figure, the structurally existing device with two cameras (13,14) as image-forming devices. In the right part of the figure, the image of a, the freedom of movement defining record is shown. By means of the computer unit (15) indicated in the lower part of the figure, the detected position-actual data of the following roller (8) are constantly compared with the stored movement clearance.
The particular advantage of such a change process is that a three-dimensional image can be generated and compared via a computer unit (15) as a result of the superposition of a plurality of cameras (13, 14). In addition, additional cameras or sensors may be provided.

From the illustrated embodiments may be departed from in many ways, without departing from the spirit of the invention.

LIST OF REFERENCE NUMBERS

1

completion

2

winding station

2a

winding position

3

Magazine for hubs, intermediate storage

4

Means of transport / crane

5

sensor

6

sensor

7

changing role

8th

follower roller

9

Unwound material web

10

waiting position

11

pre-position

12

Freedom of movement

13

camera

14

camera

15

computer unit

X

machine direction

Y

transversely

Z

height direction

S

safety distance

Claims (15)

A method for changing roles in a winding device having at least one winding position, in which a following role is spent by means of a transport unit from a storage in the winding position.
characterized in that
at least one means is present, which detects the position of the follower roll, but at least a vulnerable portion thereof, at least temporarily before reaching the winding position. Method according to claim 1,
characterized in that
the position of the follower roll is detected continuously. Method according to claim 1,
characterized in that
the position of the follower roll is detected discreetly. Method according to claims 1-3,
characterized in that
the change process is controlled and / or regulated. Method according to one of the preceding claims,
characterized in that
the collected data, in particular position values, are used to avoid a collision of the roles to be changed. Method according to one of the preceding claims,
characterized in that
The recorded data, in particular position values, are used to shorten the change process in terms of time. Method according to one of the preceding claims,
characterized in that
the at least one means activates signals which are used to influence at least one degree of freedom and / or the transport speed of the following roller and / or its transport unit at least temporarily. Method according to one of the preceding claims,
characterized in that
the follower roller is placed in the winding position while maintaining previously defined safety distances. Method according to one of the preceding claims,
characterized in that
the respective orientation of the at least one agent in space can be invariable or at least temporarily variable. Method according to one of the preceding claims,
characterized in that
the, in their orientation at least temporarily variable means, before and / or during the change process process and / or twisted and / or can be pivoted. Method according to one of the preceding claims,
characterized in that
as the data-detecting means an optical, acoustic, or electromagnetic particular light or laser, ultrasonic, radar or microwave sensor is used. Method according to one of the preceding claims,
characterized in that
it is in the winding device is a slitter. Method according to one of the preceding claims,
characterized in that
the winding position is an unwinding position. Device for winding a material web (9), in particular a paper web, which has at least one winding station (2) having a winding position (2a), in which a replacement roll (7) can be replaced by a follower roll (8),
characterized in that
Means (5,6) are provided, which are suitable for detecting a movement clearance (12) for the follower roller (8) on their way to the winding position (2a). Device according to the preceding claim,
characterized in that
the movement of the follower roller (8) can be guided taking into account the movement clearance (12).

Images