EP2307297A1

EP2307297A1 - Reel

Info

Publication number: EP2307297A1
Application number: EP09772602A
Authority: EP
Inventors: Teppo Kojo; Raimo Pesonen
Original assignee: Metso Paper Oy
Current assignee: Valmet Technologies Oy
Priority date: 2008-06-30
Filing date: 2009-04-02
Publication date: 2011-04-13
Anticipated expiration: 2029-04-02
Also published as: FI20085670A; FI120971B; WO2010000915A1; EP2307297B1; CN102076582A; FI20085670A0

Abstract

A reel (1) for the continuous reeling up of a fibrous web around a reel spool (5) to form a machine roll (6), the reel (1) comprising a reeling drum (10), whereby a nip load can be formed between the machine roll (6) and the reeling drum (10), the machine roll (6) being arranged so as to be movable, during the reeling, along an substantially horizontal path from the starting point of the reeling to the point of transfer of the completed machine roll, the starting point of the reeling being upstream of the reeling drum (10) and the point of transfer downstream of the same, whereby, upstream of the reeling drum, there are primary support means (7) for supporting the machine roll (6) against the reeling drum (10), and downstream of the reeling drum (10), there are secondary forks (8) for supporting the machine roll (6) against the reeling drum (10).

Description

Reel

The invention relates to a reel for continuously reeling up a fibrous web around a reel spool to form a machine roll, the reel comprising a reeling drum, whereby a nip load can be formed between the machine roll and the reeling drum, the machine roll being arranged so as to be movable during the reeling, along an substantially horizontal path, from the starting point of the reeling to the point of transfer of the completed machine roll, the starting point being upstream of the reeling drum and the point of transfer downstream of the same.

The reel is a device that reels a material, which is produced as a continuous fibrous web, into the form of a roll, a machine roll. In the production process of the fibrous web, reeling up is generally the first sub-process, wherein the continuous production is interrupted to be continued in sequences. The machine roll is formed around the reel spool that works as the core of reeling, i.e., the fibrous web on one machine roll has a beginning and an end. An ongoing trend in the field is the continuous increase in the size of machine rolls, causing a continuous need to develop the reels. In practice, the dimensioning of the reel spool determines the maximum size of the machine roll. However, as we are talking about a dynamic environment and the fibrous web is a reelable material that is sensitive to various defects, the role of the reel as the maintainer of the performance of a paper or board machine is of extreme importance. One reason behind the continuous increase in machine roll sizes is the desire to provide, in the fibrous web production, fewer beginnings and ends that impede or disturb the production and reduce the performance.

To facilitate the description, the following terms are used in connection with describing the invention: The machine direction (MD) is called the x-direction, the cross direction (CD) is called the y-direction, and the elevation is called the z- direction. The incoming direction of the fibrous web is called the upstream direction and its outward direction is called the downstream direction. In the case of ro- tary reels and drums, this separating transition point is the vertical straight line or level that passes through the rotation axis. In this connection, the core of reeling is called the reel spool, but it could as well be called a reeling axis.

In the environment of the reel technology, the object of the invention is to provide a simple, robust and reliable reel that is well-suited to a modernizing product. Thus, the object is to provide a reel product of a lower middle price category, which, however, would provide sufficient tools for reeling the most types of fibrous webs.

The reel according to the invention is characterized in that, upstream of the reeling drum, there are primary supporting means for supporting the machine roll against the reeling drum and, downstream of the reeling drum, there are secondary forks for supportingthe machine roll against the reeling drum.

The reel according to a first embodiment of the invention is characterized in that, upstream of the reeling drum, there are primary forks for supporting the machine roll against the reeling drum and, downstream of the reeling drum, there are sec- ondary forks for supporting the machine roll against the reeling drum.

The reel according to a second embodiment of the invention is characterized in that, upstream of the reeling drum, there are primary carriers for supporting the machine roll against the reeling drum and, downstream of the reeling drum, there are secondary forks for supporting the machine roll against the reeling drum.

According to the objectives, a reel, which in terms of its reeling-up principle is mainly based on the conventional pope-type solution, can thus be implemented, yet utilizing the new technology in the construction of the machine roll to a sufficient degree.

In the following, the invention is described in detail with reference to the appended drawing, wherein Figs. 1a-1d show the operation sequence of the reel according to a first embodiment of the invention,

Figs. 2a-2d show the operation sequence of the reel according to a second embodiment of the invention,

Fig. 1a shows the reel 1 for the continuous reeling up of the fibrous web around the reel spool 5 for forming the machine roll 6, the reel 1 comprising a reeling drum 10, whereby a nip load can be formed between the machine roll 6 and the reeling drum 10, the machine roll 6 being arranged so as to be movable during the reeling along an substantially horizontal path, such as reeling rails 20, from the starting point of the reeling to the point of transfer of the completed machine roll, the start- ing point of the reeling being upstream of the reeling drum 10 and the point of transfer downstream of the same, whereby upstream of the reeling drum, there are primary forks 7 for supporting the machine roll 6 against the reeling drum 10, and downstream of the reeling drum 10, there are secondary forks 8 for supporting the machine roll 6 against the reeling drum 10. In Fig. 1a, the reel is in a position, wherein an old machine roll 6b is coming to a stop, or has been stopped and transferred to the following process stage. The reeling of a new machine roll 6a has freshly started upstream of the reeling drum 10.

Fig. 1b shows a position, wherein the machine roil 6 has been reeling a while, whereby there is some fibrous web W around the reel spool 5. The primary forks 7 are adapted to keep the machine roll 6 in a desired position on the reeling rails 20. Furthermore, the primary forks 7 are rotatably articulated on their pivots 70, which are situated below the horizontal level that passes through the rotation axis of the reeling drum 10. The secondary forks 8 are moved towards the position, where the load can be transferred from the primary forks to the secondary forks 8. The secondary forks 8 are also adapted to keep the machine roll 6 in the desired position on the reeling rails 20. The nip load is primarily provided by means of the vertical movement of the reeling drum, but the nip load can also be provided by loading the reel spool 5 by the primary forks 7 or the secondary forks 8 against the reeling drum 10.

Fig. 1c shows the reel in a position, wherein the primary forks 7 and the secondary forks 8 are arranged opposite to each other, so that the primary forks 7 and the secondary forks 8 can be simultaneously connected to the bearing housing 57 of the reel spool 5. The time or the travel (the movement of the reel spool 5 along the reeling rails 20), during which the primary forks 7 and the secondary forks 8 can be simultaneously connected, is preferably as long as possible. This is because the sequence of the reel can then be designed as freely as possible, and there is no need to try to transfer the load too quickly after starting the reeling. For some types of fibrous webs, this influences the formation of reeling defects.

Fig. 1c further shows, how the support of the machine roll 6 for the nip load is arranged so as to be transferred from the primary forks 7 to the secondary forks 8, while the machine roll 6 is substantially above the reeling drum 10. According to an embodiment, the support of the machine roil 6 is arranged so as to be transferred from the primary forks 7 to the secondary forks 8, while the machine roll 6 is next to the top dead centre of the reeling drum 10. This top dead centre is a preferable point of transfer, because it is relatively simple to smoothly arrange the transfer of load without a load peak. The primary forks 7 and the secondary forks 8 are opposite each other and the path/load direction of the reeling drum is perpendicular compared with the former. In this way, the likelihood of a load peak possi- bly caused by the load transfer is extremely small. Fig. 1d shows a position, wherein the primary forks 7 have transferred to fetch the following reel spool 5 from its storage position or a place, where the reel spools are placed by a crane. The primary forks 7 and the secondary forks 8 are rotatably articulated on their pivots 70, 80, which are situated below the horizontal level that passes through the rotation axis of the reeling drum 10. As the paths of the primary and the secondary forks, in practice, define the maximum diameters of the reel spool 5, the reeling drum 10 and the machine roll 6, the basic geometry of the reel is, in practice, determined on the basis of this dimensioning.

In this way, the reel in the solution according to the invention is implemented, ac- cording to the figures, by two pairs of loading forks, i.e., the primary fork and the secondary fork, and by a reeling-drum that is at least vertically movable. When so desired, a direction other than vertical, such as oblique, can also be selected as the direction of movement of the reeling drum. Similarly, the substantially horizontal path may refer to a slightly inclined one, such as an inclination of 0.4 degrees. The second pair of loading forks takes an empty reel spool from the storage or directly from the crane and takes care of controlling the machine roll in the initial reeling. Accelerating the reel spool to the speed of the web before the transfer can be implemented by any known starter types. The latter pair of forks takes care of the final reeling and the transfer to the deceleration station. The loading forks may comprise a fastening/locking mechanism of the reel spool, such as a second clamp operated by an actuator, so that the reel spool stays on the forks at all reeling stages. The nip load can be implemented by loading on the side of the reeling drum. Regarding the grooving/perforation/coatings/suctions etc., the properties of the reeling drum can be as is presently known and delivered for the needs of vari- ous types of fibrous webs/machine widths/running speeds. Due to the movement range of the primary and secondary forks, the diameter of the reeling drum is preferably small; therefore, a double-casing composite roller is also an alternative solution for the reeling drum. When needed, it can also be implemented by a belt drive, which further reduces the costs. The advantages of the reel according to the invention include the linear motion of the reel spool and the ensuing advantages; among others, a low structure, a simple and advantageous control mechanism of the machine roll and frame structure of the reel. Furthermore, when so needed, oscillation and the secondary nip can be implemented in a relatively simple manner, i.e., the reel can be updated, taking into consideration additional process chal- lenges. Fig. 2a shows the reel 1 for the continuous reeling up of the fibrous web around the reel spool 5 to form the machine roll 6, the reel 1 comprising a reeling drum 10, whereby a nip load can be formed between the machine roll 6 and the reeling drum 10, the machine roll 6 being arranged so as to be movable during the reeling along an substantially horizontal path, such as reeling rails 20, from the starting point of the reeling to the point of transfer of the completed machine roll, the starting point of the reeling being upstream of the reeling drum 10 and the point of transfer downstream of the same, whereby upstream of the reeling drum, there are primary carriers 7 for supporting the machine roll 6 against the reeling drum 10, and downstream of the reeling drum 10, there are secondary forks 8 for supporting the machine roll 6 against the reeling drum 10. In Fig. 2a, the reel is in a position, wherein the completed machine roll 6b is coming to a stop, or has been stopped and transferred to the following process stage. The reeling of a new machine roll 6a has freshly started upstream of the reeling drum 10 some time ago.

Fig. 2b shows a position, wherein the machine roll 6 has been reeling for another while, whereby there is some fibrous web W around the reel spool 5. The primary carriers 7 are adapted to keep the machine roll 6 in the desired position on the reeling rails 20. Furthermore, the primary carriers 7 are linearly fitted with bearings, so that the path of the primary carrier 7 in the x-direction extends from up- stream of the rotation axis of the reeling drum to downstream of the same. The secondary forks 8 are moved towards the position, wherein the load can be transferred from the primary carriers 7 to the secondary forks 8. The secondary forks 8 are also adapted to keep the machine roll 6 in the desired position on the reeling rails 20. The nip load F is primarily provided by means of the vertical or z- directional movement of the reeling drum 10, but the nip load can also be provided by loading the reel spool 5 against the reeling drum 10 by the primary carriers 7 or the secondary forks 8.

Fig. 2c shows the reel in a position, wherein the primary carriers 7 and the secondary forks 8 are arranged opposite to each other, so that the primary carriers 7 and the secondary forks 8 can be simultaneously connected to the bearing housing 57 of the reel spool 5. The time or the travel (the movement of the reel spool 5 along the reeling rails 20), during which the primary carriers 7 and the secondary forks 8 can be simultaneously connected, is preferably as long as possible. This is because the sequence of the reel can then be designed as freely as possible, and there is no need to try to transfer the load too quickly after starting the reeling. For some types of fibrous webs, this influences the formation of reeling failures. Fig. 2c further shows, how the support of the machine roil 6 for the nip load is arranged so as to be transferred from the primary carriers 7 to the secondary forks 8, while the machine roll 6 is above the reeling drum 10. According to an embodiment, the support of the machine roll 6 is arranged so as to be transferred from the primary carriers 7 to the secondary forks 8, while the machine roll 6 is next to the top dead centre of the reeling drum 10. This top dead centre is a preferable point of transfer, because it is relatively simple to smoothly arrange the transfer of load without a load peak. The primary carriers 7 and the secondary forks 8 are opposite each other and the path/load direction of the reeling drum is perpendicular com- pared with the former. In this way, the likelihood of a load peak possibly caused by the load transfer is extremely small.

Another preferred embodiment of this load transfer is to implement it so that the contact point is at a distance downstream of the top dead centre of the reeling drum 10. In terms of the periphery angle of the reeling drum 10, this may mean, for example, from 10° to 45° from the vertical direction, i.e., downstream of the top dead centre. In that case, the contact point between the reeling drum 10 and the machine ro\\ 6 is in such a p]ace that the nip force F has distinct components in the x- and z-directions. Then, small inaccuracies of measurement, any noise caused by oscillation in the radial or peripheral directions or other inaccuracy factors that are related to defining the nip force do not become inconveniently large.

Fig. 2d shows a position, wherein the primary carriers 7 have transferred to fetch the following reel spool 5 from its storage position or the place, where the reel spools are placed by the crane. The primary carriers 7 are fitted with bearings to be linearly movable in the x-direction and the secondary forks 8 are rotatably ar- ticulated on their pivots 80, which are situated below the horizontal level that passes through the rotation axis of the reeling drum 10. As the paths of the primary carriers and the secondary forks, in practice, define the maximum diameters of the reel spool 5, the reeling drum 10 and the machine roll 6, the basic geometry of the reel is, in practice, determined on the basis of this dimensioning.

In the solution according to this second embodiment, according to the figures, the reel is implemented by single carriers, i.e., the primary carriers and the secondary forks, and by a reeling drum that can be moved at least in the vertical direction. When so desired, a direction other than vertical, such as oblique, can also be selected as the direction of movement of the reeling drum. Similarly, the substantially horizontal path may refer to a slightly inclined one, such as an inclination of 0.4 degrees. The primary carriers take an empty reel spool from the storage or directly from the crane and take care of controlling the machine roll during the initial reeling. An advantageous embodiment of the actuator that is arranged to move the primary carriers is a servo-driven kinetic screw, such as a ball-race screw or the like. Other preferred embodiments include, for example, linear motors and the like, which are suitable for the purpose.

One possible implementation of the reel according to the second embodiment is to arrange the pivots 70 of the primary forks 7 according to the first embodiment to be linearly movable in carriers. In that case, the solution can utilize the good properties of both embodiments and yet provide quite a cost-effective solution. Another possible implementation is to arrange locking levers in the primary carriers, which keep the bearing housing of the reel spool in a constant position with respect to the primary carriers, and the movement of the primary carriers are used to take care of any matters relating to the reeling technique. The matters relating to the reeling technique herein refer to the adjustment of the reeling geometry, the posi- tion of the hub of the machine roll with respect to the reeling drum, in particular, or possibly, to participating in the adjustment of the nip force component in the x- direction.

Furthermore, in the reel according to the second embodiment, the acceleration of the reel spool to the web speed before the transfer can be implemented by any known starter types, such as a centre drive, a direct centre drive, the rotator of a coupling that rotates from the periphery by means of friction, or the like. The latter pair of forks takes care of final reeling and the transfer to the deceleration station. The loading forks or carriers may comprise a fastening/locking mechanism of the reel spool, such as locking levers operated by an actuator, so that the reel spool stays on the forks at all reeling stages. The nip load can be implemented by loading on the side of the reeling drum. Regarding the grooving/perforation/coatings/suctions etc., the properties of the reeling drum can be as is presently known and delivered for the needs of various types of fibrous webs/machine widths/running speeds. Due to the movement ranges of the primary carriers and the secondary forks, the diameter of the reeling drum is preferably small; therefore, a double-casing composite roller is also an alternative solution for the reeling drum. When needed, it can also be implemented by a belt drive, which further reduces the costs. The advantages of the reel according to the invention include the linear motion of the reel spool and the ensuing advantages; among others, a low structure, a simple and advantageous control mechanism of the machine roll and frame structure of the reel. Furthermore, when so needed, oscillation and the secondary nip can bθ implemented in a relatively simple manner, i.e., the reel can be updated, taking into consideration additional process challenges.

Claims

CLAIMS:

1. A reel (1) for the continuous reeling up of a fibrous web around a reel spool (5) to form a machine roll (6), the reel (1) comprising a reeling drum (10), whereby a nip load can be formed between the machine roll (6) and the reeling drum (10), the machine roll (6) being arranged so as to be movable during the reeling along an substantially horizontal path from the starting point of the reeling to the point of transfer of the completed machine roll, the starting point of the reeling being upstream of the reeling drum (10) and the point of transfer downstream of the same, characterized in that, upstream of the reeling drum, there are primary support means (7) for supporting the machine roll (6) against the reeling drum (10), and downstream of the reeling drum (10), there are secondary forks (8) for supporting the machine roll (6) against the reeling drum (10).

2. A reel according to Claim 1, characterized in that, upstream of the reeling drum, there are primary forks (7) for supporting the machine roll (6) against the reeling drum (10) and, downstream of the reeling drum (10), there are secondary forks (8) for supporting the machine roll (6) against the reeling drum (10).

3. A reel according to Claim 1, characterized in that, upstream of the reeling drum, there are primary carriers (7) for supporting the machine roll (6) against the reeling drum (10) and, downstream of the reeling drum (10), there are secondary forks (8) for supporting the machine roll (6) against the reeling drum (10).

4. A reel (1 ) according to Claim 2, characterized in that the primary forks (7) are rotatably articulated on their pivots (70), which are situated below the horizontal level that passes through the rotation axis of the reeling drum.

5. A reel (1 ) according to Claim 3, characterized in that the primary carriers (7) are linearly fitted with bearings, so that the path of the primary carrier (7) in the x- direction extends from upstream of the rotation axis of the reeling drum to downstream of the same.

6. A reel (1) according to Claim 2, characterized in that the primary forks (7) and the secondary forks (8) are rotatably articulated on their pivots (70, 80), which are situated below the horizontal level that passes through the rotation axis of the reeling drum (10).

7. A reel (1) according to Claim 2, characterized in that the primary forks (7) and the secondary forks (8) are arranged opposite to each other, so that the pri- mary forks (7) and-the secondary forks (8) can be simultaneously connected to the bearing housing (57) of the reel spool (5).

8. A reel (1) according to Claim 2, characterized in that the support of the machine roll (6) for the nip load is arranged to be transferred from the primary forks (7) to the secondary forks (8), while the machine roll (6) is substantially above the reeling drum (10).

9. A reel (1) according to Claim 2, characterized in that the support of the machine roll (6) is arranged to be transferred from the primary forks (7) to the secondary forks (8), while the machine roll (6) is next to the top dead centre of the reel- ing drum (10).

10 A reel (1) according to Claim 1, characterized in that the support of the machine roll (6) is arranged to be transferred from the primary carriers (7) to the secondary forks (8), while the machine roll (6) is downstream of the top dead centre of the reeling drum (10).

11. A reel (1 ) according to Claim 3, characterized in that the nip load is primarily provided by means of the vertical movement of the reeling drum.

12. A reel (1 ) according to Claim 1 , characterized in that the primary forks (7) or the primary carriers (7) are adapted to keep the machine roll in a desired position on reeling rails.

13. A reel (1) according to Claim 1 , characterized in that the secondary forks (8) are adapted to keep the machine roll (6) in a desired position on the reeling rails (20).