EP0890537B1 - Reel winding device, in particular for reel slitting device - Google Patents

Description

The invention relates to a roll winding device, especially for a slitter winder, with a Roller carrying device and with a pneumatic Pressure relief device.

Such a roll winding device is for example known from DE 195 24 905 A1.

The invention is intended to be exemplified below with reference to Paper rolls are described. But it is not open limited this application.

In one of the last manufacturing steps, paper webs usually cut to the correct width and then wound up in rolls before packed and shipped. The winding cores, on in contrast which the paper rolls are wound up to those used during paper production Drums only a relatively low stiffness and Load capacity. They are often designed as cardboard tubes. This causes the paper rolls to curl usually supported by support rollers. This is particularly pronounced when the winding device is designed as a roller winder. Here the roll rests on carrier rollers without additional Attack holding forces on the core. But also with a backup roller roller with additional holding means attack the roll core, there is a support on a roller. When the paper rolls are bigger and heavier the support line forces of the paper roll on the roller or rollers relatively large, which is the disadvantage has that the winding hardness is increased. This can cause the roll to burst later. To relieve the rollers and reduce the line force can a pneumatic pressure below the Role are generated so that the role is at least partially resting on an air cushion.

This measure has proven itself. However Relatively much air is required to relieve the roll must be on appropriate pressure because it is difficult is due to the changing roller geometry Air can only be used to build the air cushion. It can be observed that a large part of the Air with relatively little effect escapes.

The invention has for its object the air consumption to lower.

This task is done with a roll winding device of the type mentioned in that the Pressure relief device several blow boxes with outlet nozzles has on its top, the Blow boxes hinged in pairs on a swing arm on which they are parallel to the roller axis extending tilt axis are tiltable.

If the swing arm at one axial end of the blow boxes is arranged, then a corresponding rocker at the other end of course also required to to ensure the necessary support. With this Design, it is possible that the angle of inclination of the blow boxes automatically on the during winding adapting changing roll diameter. At the beginning of Winding process, the roll has practically only the diameter of the roll core, which is of the order of magnitude 10 or 20 cm. There is no noteworthy here Air exposure required. The blow boxes but can adjust in this case so that their Upper side inclined relatively strongly to the horizontal plane are. If the roll diameter increases, the Inclination more and more and automatically depending from the roll diameter. This allows the gap between the top of the blow boxes and the circumference of the Roll automatically kept to a relatively small thickness be, this thickness also relatively even is about the circumferential direction. From the outlet nozzles escaping air is then mainly used to act on of the role and only escapes in one very slightly unused. The emerging air jets are namely practically perpendicular to the peripheral wall directed to the role.

The outlet nozzles are preferably symmetrical to one Plane arranged perpendicular to the surface stands and runs through the tilt axis. This will ensured that the gap on both edges of the Blow boxes, based on the circumferential direction of the roll, largely remains the same. Should the gap on one Enlarging the edge, more air escapes here, so that the Pressure here decreases and becomes less than the pressure the other edge. The box will then be about Swing the tilting axis back again until it does equilibrium is reached on both edges. Because of the symmetrical design of the boxes is then reached a state of equilibrium when both edges are equally far from the circumference of the roll.

The blowing nozzles are advantageously at least two parallel rows arranged parallel to Tilt axis run. This configuration has manufacturing technology Benefits. Leave the parallel rows generate easily and check for symmetry. With a "chaotic" hole pattern, this would be with more effort.

The focus of the blow boxes is preferably in Direction of gravity below the tilt axis. If the Roll is lifted, they automatically swivel in a position in which the top is vertical lies horizontally above. When a new role is launched the tilt angle is at the latest at the Pressurization automatically.

In a particularly preferred embodiment, that several wings are articulated in pairs are hung on a swing arm bracket on which they are around a second one running parallel to the roller axis Tilt axis are tiltable. This configuration is special then an advantage if the expected Roll diameter get bigger and the one to support pressure from a single roll Blow box pair can be generated only with difficulty could. The principle is similar for several blow boxes like a pair of blow boxes. For a pair of blow boxes the two blow boxes are hung on a swing arm. You can now have two such wings with blow boxes again hang on a swing arm support which these wings are rotatable. Then everyone will Blow box on his swing arm and each swing arm on adjust their swing arm carrier so that the gap between the surface of the blow boxes and the roll remains even. You can do one Continue building in the manner of a cascade, if, for example, two swing arm supports in pairs be articulated on a base support.

The blow boxes of a rocker are preferably symmetrical to a penetrating the second tilt axis Level arranged. The reason here is the same as specified above for a swing arm with a pair of blow axes. This results in a balance of forces on the swing arm carrier, when the swing arm carrier with its hinged wings and hinged on them Blow boxes is in the desired position. If there are deviations, this will result Force imbalance automatically becomes one Return the system to a stable state.

The blow boxes advantageously have a variable working width on. This takes into account the fact that changing especially in a slitter winder Roll widths must be processed. If you can change the working width, then you can Restrict airflow to the areas where a Role rests.

It is also preferred that the blow boxes closure means have for the outlet nozzles. These closures are not just limited to the working width change. One can with such closures also areas in the middle of the axial extension of the Shut down the blow boxes. This is especially true of Advantage if you wind several rolls at the same time, which are spaced from each other. Such Constellation arises, for example, in slitter reels.

In a preferred embodiment it is provided that the locking means self-regulating depending on a cover of the top formed by a roller are. The outlet nozzles are only then released when there is a roll over it, and otherwise kept closed. In a simple embodiment this can be done, for example, with check valves reach in the outlet nozzles where a Control pin suitable for opening the valves from the Surface protrudes. When a roll is wound the control pins are pushed in below the roller and open the valves. Valves off the roll remain closed. Of course, there are other sensors conceivable, for example light barriers, pressure sensors or similar Common to all is that the closure means can only be controlled automatically where there is a role is to be supported.

It is particularly preferred that the closure means are formed by plates that are on the inside of the rest against the top wall. This gives one self-acting seal. The pressure inside the blow boxes presses the plates against the Wall and closes the outlet nozzles even more securely.

Fig. 1

einen Blaskasten,

Fig. 2

einen schematischen Querschnitt durch den Blaskasten,

Fig. 3

ein System von Blaskästen bei einer kleinen Rollen und

Fig. 4

das System von Blaskästen bei einer großen Rolle.

The invention is described below with reference to a preferred embodiment in connection with the drawing. In it show:

Fig. 1

a blow box,

Fig. 2

a schematic cross section through the blow box,

Fig. 3

a system of blow boxes with a small roll and

Fig. 4

the system of blow boxes in a big role.

Fig. 1 shows a blow box 1, which, as later related 3 and 4 will be explained, is used in a roll winding device. The Blow box 1 has a housing 2 with an upper side 3 and end faces 4. At the top 3, more precisely in the top 5 forming wall 5, are a A large number of outlet nozzles 6 are arranged which look like Fig. 1 can be seen symmetrically in two parallel rows are arranged to a level 7 level 7 stands vertically on the surface 3 and penetrates one Tilt axis 8, which is formed by a pivot pin 9 is. The pivot pin 9 and thus the tilt axis 8 are arranged above the center of gravity of the blow box 1. When the blow box 1 is suspended on the pivot pin 9 then it adjusts itself so that the top 3 is horizontal and the outlet nozzles 6 point vertically upwards.

At the bottom 10 of the housing 2 is an air supply connection 11 provided by the air with a predetermined Pressure in the interior 12 of the blow box 1 can flow in. The air can escape from the interior 12 escape through the outlet nozzles 6.

3 and 4 now show the use of such Blow box 1 in a winding device 13, in a paper roll 14 is formed by a Paper web 15 is wound up. The paper roll 14 lies on two support rollers 16, 17, of which at least one is driven.

3 and 4 it is assumed that that the winding process is completed, in which the Carrier rollers 16, 17 a much smaller distance need to take to pick up an empty roll core to be able to. As soon as the roll reaches a certain size has, the support rollers 16, 17 apart to make room for the pressure relief device 18 to provide. Here, the support rollers 16, 17 or the pressure relief device 18 or move everyone.

A pneumatic is between the two support rollers 16, 17 Pressure relief device 18 arranged, the In the present exemplary embodiment, four blow boxes 1 having. The blow boxes 1 are in pairs a swing arm 19 hung and articulated with the help the pivot pin 9. Here, the tilt axis 8 aligned parallel to the axis of the paper roll 14. The Swing 19 are in turn articulated on a swing arm support 20 hung. This results in one second tilt axis 21, 22. Also the second tilt axis 21, 22 runs parallel to the axis of the paper roll.

The formation of each rocker 19 is symmetrical to the second tilt axis 21, 22, i.e. the two blow boxes 1 of each rocker 19 are equally far from the second tilt axis 21 removed.

In operation, i.e. when winding the paper rolls 14, the diameter of the paper rolls 14 increases. In order to the weight of the paper roll 14 also increases and accordingly the contact line forces of the paper roll 14 on the support rollers 16, 17.

In order to provide relief here, the Air supply connection 11 promoted air into the blow boxes 1. This air then passes through the outlet nozzles 6 out. Since both the blow boxes 1 articulated on their Swing arm 19 and the swing arm 19 are articulated on Swingarm carrier 20 are suspended and the swingarm carrier 20 symmetrically between the two support rollers 16 and 17 is arranged, then automatically results Setting in which the surfaces 3 of the blow boxes 1 an equal distance from the circumference of the paper roll 14, regardless of which one Diameter the paper roll 14 has. The distance can change overall with increasing roll diameter change. But it is 1 for everyone in all blow boxes Moment of wrapping approximately the same. This leaves explain themselves as follows: If a blow box does not parallel to the tangent to the peripheral surface of the paper roll 14 is then for a series of Outlet nozzles 6 a larger air gap and thus a lower flow resistance than for the other series. Accordingly, the reaction force here is between Paper roll 14 and blow box 1 less than on the other row. The blow box 1 is around its tilt axis 8 can be pivoted until both rows of outlet openings 6 the same distance from the circumference have the paper roll 14. This happens automatically without outside intervention. In the same way but each rocker 19 also adjust so that the Forces on both blow boxes 1 are the same. A power imbalance always leads to a movement of the Swing 19 into its stable position, where, as I said, the forces are the same. After all, you can too the swing arm support 20 about a third tilt axis 22 make it pivotable, although in many cases it is not necessary is.

Of course you can instead of the four shown Blow boxes 1 also use eight blow boxes 1, if you turn the swing arm carrier 20 in an articulated manner arranges another carrier, not shown.

With the arrangement shown it is possible due to the uniform formation of the gap between the blow boxes 1 and the paper roll 14 to ensure that the ejected from the outlet nozzles 6 Air is used practically exclusively To generate air cushions, so to carry the paper roll 14. Air loss due to uneven gaps and accordingly uneven distribution of forces on the Paper roll 14 are largely avoided.

From Fig. 2 it can be seen that for the two rows 6 plate-like flaps 23, 24 are provided by outlet nozzles are the ones with the solid lines shown position in which they the outlet nozzles 6th release into a position shown in dashed lines can be pivoted in the outlet nozzles 6 cover. You can now 6 for each outlet nozzle provide such a plate 23, 24. It is natural also possible, the plates 23, 24 each for groups provided by outlet nozzles 6. With this configuration it is possible for the air outlet from the outlet nozzles 6 on certain axial areas of the blow box 1 limit. You can then blow box 1 on the one hand, adapt to different roll widths. Man can also use the blow box when in the winding device 13 several axially next to each other, but at the same time spaced roles be wrapped. Out of a roll no air can be lost in the covered areas. This enables very energy-saving work. The air that has been pressurized becomes used almost exclusively for rolls of paper 14 supported on an air cushion.

Claims (10)

1. Reel winding device (13), in particular for a reel slitting device, comprising a reel carrier device (16, 17) and a pneumatic pressure relief device (18), characterised in that the pressure relief device (18) comprises a plurality of blow boxes (1) with outlet nozzles (6) on their top surfaces (3), the blow boxes (1) being hinge-mounted in pairs on a rocker arm (19) on which they can tilt about a tilting axis (8) extending parallel to the reel axis.
2. Device according to claim 1, characterised in that the outlet nozzles (6) are arranged symmetrically relative to a plane (7) which is perpendicular to the surface (3) and extends through the tilting axis (8).
3. Device according to claim 2, characterised in that the blow nozzles (6) are arranged in at least two parallel rows extending parallel to the tilting axis (8).
4. Device according to one of claims 1 to 3, characterised in that the centre of gravity of the blow boxes (1) is situated below the tilting axis (8) in the direction of gravity.
5. Device according to one of claims 1 to 4, characterised in that a plurality of rocker arms (19) are hinge-mounted in pairs on a rocker arm carrier (20) on which they can tilt about a second tilting axis (21) extending parallel to the reel axis.
6. Device according to claim 5, characterised in that the blow boxes (1) of a rocker arm (19) are arranged symmetrically relative to a plane passing through the second tilting axis (21).
7. Device according to one of claims 1 to 6, characterised in that the blow boxes (1) have a variable working width.
8. Device according to one of claims 1 to 7, characterised in that the blow boxes (1) have closure means (23, 24) for the outlet nozzles (6).
9. Device according to claim 8, characterised in that the closure means (23, 24) are actuated automatically when the top surface (3) is covered by a reel (14).
10. Device according to claim 8 or claim 9, characterised in that the closure means (23, 24) are formed by plates bearing from the inside against the wall (5) forming the top surface (3).

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