WO2012107644A1

WO2012107644A1 - Method of reducing vibrations at a partial web winder for fiber web

Info

Publication number: WO2012107644A1
Application number: PCT/FI2012/050122
Authority: WO
Inventors: Mika Kaisanlahti; Sami LUMIJÄRVI
Original assignee: Metso Paper, Inc.
Priority date: 2011-02-09
Filing date: 2012-02-09
Publication date: 2012-08-16
Also published as: FI20115123A0; FI123538B; DE112012000734T5; FI20115123A

Abstract

The present invention relates to a method of reducing vibration of a fibrous web in a partial web winder (10) wherein during the winding the plurality of partial web rolls (14) to be formed is simultaneously supported by means of a first support member (12.1) and at least one second support member (12.2) and at least one third support member (20) forming a winding nip and wherein during the first running procedure of the method the plurality of partial web rolls (14) is wound so that the position of said at least one third support member (20) is changed as the diameter of the plurality of partial web rolls (14) increases while the winding proceeds. When the winding situation problematic for the vibration properties and/or behaviour of said at least one third support member is reached or approached, said at least one third support member (20) is positioned in place and in the second running method the plurality of partial web rolls (14) is wound so that said at least one third support member (20) is positioned in place and that the position of said at least one second support member (12.2) and/or said first support member (12.1) is changed as the diameter of the plurality of partial web rolls (14) increases while the winding proceeds.

Description

A method of reducing vibrations in a partial web winder of a fibrous web

[001] The present invention relates to a method according to the preamble of claim 1 for reducing vibrations in a partial web winder of a fibrous web.

[002] In a material web machine the material web coming from e.g. a paper machine is wound into large machine rolls, possibly even over 10 m wide and over 4 m in diameter, at the reel-up winder. The web of material is cut into narrower partial webs and wound into smaller so- called customer rolls with a slitter-winder.

[003] As is known in prior art, in a slitter-winder art the machine roll is un-wound and the wide web is slit with the slitting part of the slitter- winder into a number of narrower partial webs that are rewound with a partial web winder over winding spools, such as cores, to form customer rolls. When the customer rolls being simultaneously made from each partial web are ready, the slitter-winder is stopped and the partial web rolls are removed from the machine, i.e. the set change is done. Subsequent to this the process is continued as winding of a new set of rolls. These phases are repeated in sequences until the machine roll runs out of paper, whereby the machine roll is changed and the operation is started again as unwinding another machine roll. The partial web winder can be a king roll type winder in which the partial web rolls are wound carried by king rolls, typically supported by a rider roll.

[004] In winding, e.g. when winding a paper web with a slitter-winder, large vibrations occur in certain paper types at same roll rotation frequency ranges regardless of the running speed of the slitter. Usually there are about 1 to 3 vibration ranges, i.e. rotation speed ranges of the roll on which there is strong vibration, depending on the final diameter of the roll. This strong vibration causes winding reject, mechanical wear of the apparatuses, even loosening of the roll from the winding apparatus as well as decrease of winding capacity as the running speed has to be lowered during winding.

[005] FI101283 discloses a method in which the running speed of the winder is controlled based on the rotation frequency of the roll so that as the rotation frequency of the roll approaches the vicinity of the vibration range, i.e. the roll rotation frequency range where there is a strong vibration, the running speed is quickly lowered so that the rotation speed of the roll decreases to below the lower frequency of the vibration range and subsequent to this the running speed is increased so that the rotation frequency of the roll remains constant until the original running speed of the winder is reached. Due to the change of the running speed this has an effect on the total capacity of the winder.

[006] As the size of the partial web rolls increases on the king roll winding part, at least the rider roll is moved based on the diameter of the rolls, whereby at least the rider roll arrangement is movably supported by the body structure of the winding part. The consecutive longitudinal cores are locked in their places as a line of cores by means of a core locking device arranged at both ends. The support means contacting the roll (or rolls) to be wound are exposed to the dynamic load caused by the rotating roll. Especially in connection with king roll type of winders there occur dynamic loads causing vibration especially in the rider roll and the supporting rider roll beam of the king roll winder, excited by the partial web rolls to be wound. It is also typical for the process that the diameter of the roll to be wound has an effect on the vibration of the rider roll. Thus the vibration conditions change as the winding proceeds. [007] The design aim of the rider roll of a slitter-winder is a stable construction able to withstand dynamic load. A generally used practical solution is one in which rider roll segments are suspended from a relatively rigid rider roll beam. The rider roll beam is moved by means of hydraulic cylinders along guides attached to the body. Both the guides and the cylinders are located near the ends of the beam.

[008] US 4165843 discloses a king roll winding apparatus wherein the rider roll is suspended by chains and the opposite ends of the rider roll beam are provided with two dampers realized as compressed air-fed cylinder-piston apparatuses that press against the body by means of friction surfaces arranged at the ends of the piston rods. In such a suspension the position of the rider roll beam and the rider roll is very weakly controlled and e.g. the possibilities to adjust the nip power of the rider roll are in practice nearly non-existent.

[009] Fl 20055039 discloses reducing the vibration of the rider roll beam by supporting the beam to the body construction at the portion between the ends in addition to supporting just the ends, whereby the rigidity and vibration dampening of the rider roll beam increases.

[0010] Even though the solutions described above are advantageous as such, lately there have occurred needs to further improve the vibration properties and operation of the fibrous web winding apparatus. Thus an especial aim of this invention is to specifically improve the state of the art by disclosing such a fibrous web winding apparatus and a method for winding a fibrous web with a winding apparatus that the improved operation and running capabilities of the winding apparatus can be carried out. [0011] The aims of the invention are mainly achieved with a method for reducing the vibration of a fibrous web in a partial web winder, wherein during winding the plurality of partial web rolls to be formed is simultaneously supported by means of a first support member and at least one second support member and at least one third support member forming a winding nip and in which first running procedure of the method the plurality of the partial web rolls is wound so that the position of said at least one third support member is changed as the diameter of the plurality of partial web rolls increases as the winding proceeds. A characterizing feature of the invention is that when the winding situation problematic for the vibration properties and/or behaviour of said at least one third support member is reached or approached, said at least one third support member is positioned in place and a second running procedure of the method is carried out, in which the plurality of partial web rolls is wound so that said at least one third support member is positioned in its place and the position of said at least second support member and/or said first support member is changed as the diameter of the plurality of partial web rolls increases as the winding proceeds. [0012] Immovably positioning said at least one third support member, preferably by locking its movement, brings about the advantage that the specific frequency of the at least one said third support member increases, whereby the approaching or present rotation frequency of the plurality of partial web rolls no more has a problematic influence on the vibration of the third support member or at least it will be much less problematic.

[0013] The various running procedures of the disclosed method are carried out during winding of one set of rolls, i.e. the diameter of the plurality of partial web rolls increases in subsequent running procedures. [0014] According to one embodiment the second running procedure of the method is continued until the diameter of the plurality of partial web rolls is a p re-determined diameter. According to another embodiment of the invention the second running procedure of the method is continued until the diameter of the plurality of the partial web rolls is the final diameter.

[0015] In the method, the problematic winding situation is preferably a pre-determined rotation frequency or a vibration situation of the plurality of the partial web rolls determined by measuring.

[0016] According to another embodiment of the invention, when carrying out the first running procedure, the first support member and said at least one second support member are positioned in their places and in the second running procedure of the method the plurality of the partial webs is wound so that the first support member is positioned in its place.

[0017] According to an embodiment of the invention, the second running procedure of the method is finished and the first procedure of the invention is restarted when the winding situation problematic for the vibration properties of the at least one third support member is exited.

[0018] According to yet another embodiment of the invention subsequent to the second running procedure of the method said at least one second support member is moved back to a position in which it was before starting the second running procedure.

[0019] Preferably the method is carried out by means of a king roll winder having a rider roll, whereby in the first running procedure the plurality of partial web rolls is wound so that the front roll and the rear roll of the king rolls of the king roll winder are positioned in their places and the position of the rider roll is changed as the diameter of the plurality of partial web rolls increases as the winding proceeds. When the rotation frequency problematic for the vibration properties of the rider roll is reached or approached, the rider roll is positioned in its place and in the second running procedure of the method the plurality of partial web rolls is wound so that the rider roll is positioned in place and that the position of the front roll and/or the rear roll is changed as the diameter of the plurality of partial web rolls increases as the winding proceeds.

[0020] According to an embodiment of the invention the position of the front roll is changed in horizontal direction. [0021] According to another embodiment of the invention the position of the front roll is changed in vertical direction.

[0022] According to yet another embodiment of the invention the position of the front roll is changed in an oblique direction.

[0023] The other additional characteristic features of the invention will become apparent from the appended claims and the following description of the embodiments of figures. [0024] In the following the invention and its operation are described with reference to the appended schematic drawings, in which

figure 1 illustrates an embodiment and realization of the method according to the embodiment in connection with a partial web winder of the king roll type, figure 2 illustrates the third and fourth running procedure of a method according to an embodiment of the invention in connection with a partial web winder of the king roll type, and

figure 3 illustrates some other embodiments for positioning the front roll.

[0025] Figure 1 illustrates a partial web winder 10 of a fibrous web slitter- winder, here a so-called king roll winder. The king roll winder comprises a first support means 12.1 and at least one second support member 12.2 and at least one third support member 20. In figure 1 the first support member 12.1 is the king roll, the so-called rear roll 12.1 and the second support member is the so-called front roll 12.2. Here the second support member comprises only one king roll, but in certain cases it can be replaced by e.g. two rolls and an endless belt hoop/hoops arranged to run over them, whereby there are more than one support member. Of the support rolls, the partial webs w are directed to run via the so-called rear roll 12.1 to be wound as partial web rolls 14 supported by the king rolls. The king rolls are rotatably supported to the body or foundations of the partial web winder by means of bearing 16.1 , 16.2. In the embodiment of figure 1 , the front roll 12.2 of the king rolls comprises roll positioning means 24 by means of which the position of the front roll can be changed during winding.

[0026] The partial web winder 10 also comprises a rider roll 20 supported by a rider roll beam 22 arranged for it. Here, the rider roll 20 forms at least one third support member but there can also be more than one rider roll. The rider roll beam 22 is arranged to be guided by guide 26 and it also comprises positioning apparatuses 28 by means of which the position of the rider roll can be changed during winding. The rider roll 20 and thus also the rider roll beam 22 are arranged movably in relation to the body structure 18 of the partial web winder 10. [0027] Preferably the rider roll positioning apparatus 28 comprises hydraulically operated actuators for changing the position of the rider roll and a brake or the like for locking the position. In this context the brake is also referred to with the reference number 28.

[0028] In the second embodiment of the invention shown in figure 1 the rear roll 12.1 forms the first support member supporting the plurality of partial web rolls from below, the front roll 12.2 forms the second support member and the rider roll 20 forms the third support member supporting the plurality of partial web rolls from above. Depending on the winder type there can be more support members. Especially instead of a front roll it is possible to use e.g. two rolls and a belt or belts arranged as an endless loop around them. Similarly, in addition to one rider roll, the winding part can comprise more rider rolls having optionally one or more belts arranged thereto.

[0029] In order to control the movement of the rider roll 20 the winder part is provided with at least one guide 26 supported by the body structure 18 in both ends/sides of the partial web winder 10. It is to be noted that figure 1 only illustrates one end/side of the partial web winder 10.

[0030] When the partial web winder is in use according to the second embodiment of the invention, the slit partial web is wound into partial web rolls 14 supported by king rolls 12.1 , 12.2 from below and by rider roll 20 above the partial web rolls 14. It is known that during winding excitations causing vibration of especially rider roll 20 are formed. In order to minimize vibration the partial web roll winder 10 is run as shown in figure 1 a according to the first running procedure so that in the first running procedure the plurality of partial web rolls 14 is wound so that the rear roll 12.1 and the front roll 12.2 are positioned in their places. Even though in the embodiment of figure 1 the rear roll 12.1 is fixedly installed in the body or foundation 18 it can in some cases be provided with a positioning or moving apparatus, whereby it is in the first running procedure also positioned in place.

[0031] As the plurality of partial web rolls 14 increases in size while the winding proceeds, the position of the rider roll 20 and the rider roll beam 22 is changed by means of positioning means 28 so that the rider roll loads and supports the plurality of partial web rolls 14 as desired while it moves in the direction of arrow A directed by guide 26.

[0032] Preferably the first running procedure is carried out from the start of the winding until a predefined limit value from the rotation frequency problematic for the vibration properties of the rider roll 20 is reached or approached. Then the rider roll 20 is positioned in place by locking the rider roll beam 22 on place by positioning apparatuses 28. The locked situation is shown in figure 1 b as a solid fill of the positioning apparatus.

[0033] Figure 1 b illustrates a second running procedure of the method according to the second embodiment of the invention, wherein a plurality of partial web rolls 14 is wound so that the rider roll 20 as well as the rear roll 12.1 are immovably positioned in their places. This operation, especially positioning the rider roll, preferably by immovably locking it, provides an increase of the nominal frequency of the rider roll 20, whereby the approaching or present rotation frequency of the plurality of partial web rolls no more has a problematic effect on the vibration of the rider roll or the effect is less problematic. It is to be understood here that the term rider roll means, if nothing else is said, the unit formed by at least the rider roll 20 and the rider roll beam 22. [0034] Now, as the size of the plurality of partial web rolls 14 increases while the winding progresses, the position of the front roll 12.2 is changed by means of positioning apparatuses 24 so that the rider roll loads and supports the plurality of partial web rolls 14 as desired when it is locked in place. The movement of the front roll is illustrated by arrow A'. In this embodiment the position of the front roll is changed in horizontal direction. [0035] The second running procedure according to the second embodiment of the method is preferably carried out until the rotation frequency problematic for the vibration properties of the plurality of the partial web rolls or other problematic winding situation has been passed. [0036] According to an embodiment of the invention, subsequent to the second running procedure the third running procedure is carried out, the procedure being schematically shown in figure 2a. In the third running procedure the front roll 12.2 is positioned or locked into its place where it has been moved when carrying out the second running procedure and the locking of the rider roll 20 is released. As the size of the plurality of partial web rolls 14 grows while the winding proceeds, the position of the rider roll 20 and the rider roll beam 22 is again changed by means of positioning means 28 so that the rider roll loads and supports the plurality of partial web rolls 14 as desired while it moves in the direction of arrow A directed by guide 26. Thus, in this running procedure the front roll is farther away from the rear roll than during the first running procedure.

[0037] According to an alternative running procedure of the second embodiment of the invention subsequent to the second running procedure the fourth running procedure is carried out instead of the third running procedure, the fourth running procedure being schematically shown in figure 2b. In the fourth running procedure the locking of the rider roll 20 is released and as the size of the plurality of partial web rolls increases while the winding proceeds, the position of the rider roll 20 and the rider roll beam 22 is again moved away from the king rolls 12.1 , 12.2 by means of positioning apparatuses 28 so that the rider roll loads and supports the plurality of partial webs 14 as desired as it moves in the direction of arrow A directed by the guide 26 and simultaneously the position of the front roll is changed in the direction of arrow A¹, i.e. towards the rear roll 12.1. This running procedure causes the additional advantage that the method according to the invention can be carried out more than once during the winding of one set of rolls. In this case, after the fourth running procedure the first and second running procedures are carried out at least once.

[0038] Figure 3 illustrates a realization method according to an embodiment of the invention for positioning the front roll which method can be used when e.g. carrying out the second running procedure. In other words, as the size of the plurality of partial web rolls 14 increases as the winding progresses, the change of the position of the front roll 12.2 in the vertical direction is changed by means of positioning apparatuses 24 so that the rider roll loads and supports the plurality of partial web rolls 14 as desired when it is locked in place. In figure 3 the movement of the front roll is shown with arrow A". Thus the front roll can be lowered and it can also be lifted back up to its original position, whereby also the fourth running procedure can be carried out. In the embodiment of figure 3 this is realized so that the locking of the rider roll 20 is released and as the size of the plurality of partial web rolls 14 increases while the winding proceeds the position of the rider roll 20 and the rider roll beam 22 is changed away from the king rolls 12.1 , 12.2 by means of positioning apparatuses so that the rider roll loads and supports the plurality of partial web rolls 14 as desired as it moves in the direction of arrow A directed by guide 26, while simultaneously the position of the front roll is changed upwards as shown by arrow A". Figure 3 additionally shows an embodiment in which the rear roll 12.1 also comprises roll positioning apparatuses 24 by means of which the position of the front roll can be changed during winding. This allows winding the plurality of partial web rolls 14 in the second running procedure so that at least one third support member 20 is positioned in place and that the position of at least one second support member 12.2. and said first support member (12.1 ) is changed simultaneously or at different time, e.g. alternately, as the diameter of the plurality of partial web rolls 14 increases while the winding proceeds.

[0039] It should be noted that only a few of the most preferable embodiments are disclosed above. Thus, it is obvious that the invention is not limited to the above-mentioned embodiments but it can be applied in many ways within the scope defined by the appended claims. The features disclosed in connection with various embodiments can also be used in connection with other embodiments within the inventive scope and/or different assemblies can be combined from the disclosed features, should it be desired and should it be technically feasible.

Claims

We claim

1. A method for reducing vibration in a partial web winder (10) of a fibrous web, wherein during the winding the plurality of partial web rolls

(14) to be formed is supported simultaneously by means of a first support member (12.1 ) forming a winding nip and at least one second support member (12.2) and at least one third support member (20) and in which in the first running procedure of the method the plurality of partial web rolls (14) is wound so that the position of at least one third support member (20) is changed as the diameter of the plurality of partial web rolls (14) increases while the winding proceeds, characterized in that when the winding situation problematic for the vibration properties of said at least one third support member is reached or approached, said at least one third support member (20) is positioned in place, and

in the second running procedure of the method the plurality of partial web rolls (14) is wound so that said at least one third support member (20) is positioned in place and that the position of said at least one second support member (12.2) and/or said first support member (12.1 ) is changed as the diameter of the plurality of partial web rolls (14) increases as the winding proceeds.

2. A method according to claim 1 , characterized in that the second running procedure of the method is continued until the diameter of the plurality of partial web rolls (14) is a pre-defined diameter.

3. A method according to claim 1 , characterized in that in the method the problematic winding situation is a pre-defined rotation frequency or a vibration situation of the plurality of partial web rolls determined by measuring.

4. A method according to claim 1 , characterized in that when carrying out the first running procedure the first support member (12.1 ) and said at least one second support member (12.2) are positioned in place and that in the second running procedure of the method the plurality of partial web rolls (14) is wound so that the first support member (12.1 ) is positioned in place.

5. A method according to claim 2, characterized in that the second running procedure of the method is continued until the diameter of the plurality of partial web rolls (14) is the final diameter.

6. A method according to claim 1 , characterized in that when the problematic winding situation for the vibration properties of the at least one third support member is exited, the second running procedure is finished and the first procedure of the method is restarted.

7. A method according to claim 1 , characterized in that after the second running procedure of the method said at least one second support member (12.2) is moved to the position wherein it was before commencing the second running procedure.

8. A method according to claim 1 , characterized in that the method is carried out with a king roll winder (10) having a rider roll, whereby in the first running procedure a plurality of partial web rolls (14) is wound so that the front roll (12.2) and the rear roll (12.1 ) of the king rolls of the king roll winder are positioned in place and the position of the rider roll (20) is changed as the diameter of the plurality of partial web rolls increases while the winding proceeds, characterized in that as the rotation frequency problematic for the vibration properties of the rider roll (20) is reached or approached , the rider roll (20) is positioned in place, and

in the second running procedure of the method the plurality of partial web rolls is wound so that the rider roll (20) is positioned in place and that the position of the rear roll (12.1 ) and/or the front roll (12.2) is changed as the diameter of the plurality of partial web rolls (14) increases while the winding proceeds.

9. A method according to claim 8, characterized in that the position of the front roll (12.2) is changed in horizontal direction.

10. A method according to claim 8, characterized in that the position of the front roll (12.2) is changed in vertical direction.

11. A method according to claim 8, characterized in that the position of the front roll (12.2) is changed obliquely.

12. A method according to any of the above claims, characterized in that while the third support member (20) is positioned in place it is locked in place by means of a brake (28) or the like.