EP2058260B1 - Winding core and winding core arrangement - Google Patents

Abstract

The cores (A, B) have end sections (6, 12) comprising front side sections (7, 16) at both ends, respectively. The end sections have deformation zones by which the front side sections are respectively connected to main portions (5, 11). The deformation zones are designed as attenuation zones (8, 13). The main portion is designed as a hollow cylinder, and the attenuation zone is formed by reducing wall thickness of the hollow cylinder. Triangular shaped circulating grooves (9, 14) are formed between the respective main portions and front side sections. An independent claim is also included for a winding core arrangement comprising rectangular slots.

Description

The invention relates to a winding tube with a body and at both ends in each case one end section having end portion, wherein at least one end portion (6, 12) has a deformation zone, via which the end side portion (7, 16) connected to the body (5, 11) wherein between the body (5, 11) and the end face portion (7, 16) is formed a circumferential groove (9, 14), wherein the groove of the radial outer side (15) or the radial inner side (10) of the winding tube ( A, B) goes out.

Furthermore, the invention relates to a winding tube assembly for feeding a reel winding device.

The invention will be described below with reference to a winding tube and a winding tube arrangement, which is used when winding a paper web to a winding roll.

Paper webs are produced almost endlessly and in a relatively large width of up to 10 m. In order to be manageable for a later user, they are cut in a so-called slitter to the appropriate width and then wound into bobbins. The core of such a winding roll is a winding tube.

In a Doppeltragwalzenwickler form two support rollers or equivalent facilities a winding bed. In this winding bed, the cores, which later form the core of the winding rolls, are inserted adjacent to one another in the axial direction from one end side. The partial webs of the paper web are then attached to the cores, for example glued. If the support rollers then rotate, the cores and later the part webs cut from the paper web are moved, so that the part webs are wound on the winding tube.

The paper web must be wound with a certain tension on the winding roll, so that the winding roll remains manageable later and, for example, a telescoping can be avoided. This tension also affects the sleeve. The winding tube is thereby radially compressed. This compression leads to an axial extension. Although this axial extension is small and on the order of about 1 o / oo the length of the winding tube, it can cause significant problems during operation of the reel winder. These problems can lead to ejection of the winding roll from the reel winder.

One has therefore in EP 1 658 230 B1 proposed to provide the end face of a winding tube and the end face of a winding sleeve adjacent thereto with a toothing in the form of circumferential grooves, wherein these two teeth are formed so that they can deform during the axial compression of the cores. However, such a design of the cores is relatively sensitive.

From the EP 1 650 146 A2 Winding sleeves are known which have deformation zones behind their end faces in order to compensate for the changes in length caused by the winding process and to avoid impermissible stress peaks.

The invention has for its object to reduce problems with the resulting during winding compression pressure.

This object is achieved in a winding tube of the type mentioned by the features of claim 1.

With the help of the deformation zone, it is possible to accommodate longitudinal expansion of the winding tube or the adjacent winding cores. The deformation zone forms a kind of "crumple zone", as known from the automotive field. The deformation zone lies between the front side portion and the body, i. the danger that it will be damaged directly from the outside is relatively small. Accordingly, the new winding tube is excellently adapted to the rough operation in a roll winder. The front side portion may be formed relatively thin. The denser the deformation zone at the axial end of the winding tube, the better the length expansion can be compensated. The deformation zone can even be formed so far that it extends almost to the front side of the winding tube. In this case, the end face portion has a radial extent which is smaller than the radial extent of the body or the end face portion and the deformation portion merge into one another.

Between the body and the front side portion a circumferential groove is formed. Such a groove can be achieved simply by turning. The circumferential groove leaves a reduced wall thickness portion, which then forms the weakening zone.

The groove extends from the radial outside or the radial inside of the winding tube. These are two surfaces that are freely accessible for editing, especially for turning.

The groove extends at an end portion from the radial outside and at the other end portion from the radial inside. If you then winding cores abuts one another so that in one winding sleeve, the groove from the radial outside and the other radial winding sleeve, the groove from the radial inside emanates, then the two cores can deform so to speak in the region of its two end portions into each other, so that an excellent length compensation is achieved.

Preferably, the deformation zone is formed as a weakening zone. A weakening zone is a zone in which the material of the winding tube has a lower resistance to deformation than the body. If then a force in the axial direction acts on the winding tube, then the winding tube is deformed in the weakening zone.

It is preferred that the body is formed as a hollow cylinder and the weakening zone is formed by a reduction in wall thickness of the hollow cylinder. This is a relatively easy way to form a weakening zone. The winding tube can then be formed over the entire axial length of the same material.

Preferably, the end face portion is formed as a hollow cylinder with a wall thickness which is smaller than or equal to the wall thickness of the body.

Thus, the end face section does not project beyond the body in the radial direction, so that the winding tube as a whole can have an axially extending surface without radially projecting parts, which facilitates the winding up of a material web. Radially inward, however, the face portion may be shorter than the body.

Preferably, the groove is triangular in cross section. In this case, the end face portion can create a corresponding deformation of the opposite edge of the groove.

Preferably, the groove has a maximum axial extent in the range of 1 to 4 mm. This is sufficient space available, in which the end face portion can deform into it.

Preferably, the front side portion distributed in the circumferential direction has a plurality of radially extending slots. The slits make it possible to deform the end face section even more easily into the weakening zone lying behind it.

Preferably, a deformation zone is provided only at one end face portion. This facilitates the production. On the front side of another winding tube, which cooperates with the first-mentioned winding tube, then, for example, a conical bevel can be provided, so that there is also a deformation possibility here.

Preferably, the end face portion has an axially outer end face with a radially directed surface structure. Such a surface structure may for example be formed by a plurality of circumferentially distributed grooves and projections. One can also choose a more dense gearing. If then two cores with their radially directed surface structures abut each other and the surface structures interlock, then on the one hand there is the possibility to transmit a torque from one winding tube to the other. On the other hand, the cores are also centered relative to each other. Both measures improve the winding process.

The object is also achieved by a winding tube arrangement of the type mentioned in particular by having winding tubes, as described above.

It is preferred that the cores are arranged so that differently shaped end portions are adjacent to each other. Thus, the differently shaped end portions can deform into each other to compensate for the longitudinal extent, which is caused by the compression of the winding tube during winding.

Preferably, in two adjacent cores, one has a first groove extending from the radially outer side and the other has a second groove extending from the radially inner side, the first groove having a bottom which is radially further inward than the bottom of the first by a predetermined shearing distance second groove. The size of the shear removal depends, inter alia, on the material from which the sleeves are formed, on the axial thickness of the end face portion and the position of the respective groove bottoms. The embodiment has the advantage that you can push the cores in frontal attachment to each other in the winding bed of the winding device into it. Then, when the partial webs are wound onto the cores and the winding rollers formed thereon and extend through the radial pressure, the cores in the axial direction, then the arrangement of the bottoms of the two grooves leads approximately at the same radial distance to the two areas the cores, which are adjacent to the end faces and which are bounded on its rear side by the respective groove shear. The axial width of the groove is then available as an expansion space for the cores. The two cores then penetrate each other, whereby at the same time a mutual centering is effected.

Preferably, both grooves are formed as Rechecknuten. In this case, the shearing action is particularly good. The front end sections have then about their radial extent about the same deformation resistance, so that they can be sheared off well at their base.

Preferably, the axial length of the grooves is the same. Thus, the two winding tubes can expand axially in the same way and mutually penetrate each other. The danger that remains in one or the other winding tube, an axial gap that looks different than the gap in the other winding tube, is relatively small.

Preferably, the axial length of the grooves corresponds to the axial length of the respective sections between the groove and the frontal end. Thus, the sheared end face portion is pressed into the groove and the other winding core can deform into the resulting space inside.

Preferably, the grooves have the same radial length. It does not have to be the mathematically exact same length. It is sufficient if the grooves have substantially the same radial length. As a result, the deformation resistance for both end face sections becomes approximately the same, so that it can also be assumed that both end face sections shear off approximately simultaneously. The radial length of the grooves corresponds substantially to half the radial thickness of the wall of the winding tube.

Fig. 1

eine erste Ausgestaltung einer Wickelhülsenanordnung mit zwei Wickelhülsen im Ausschnitt,

Fig. 2

eine zweite Ausführungsform einer Wickelhülsenanordnung,

Fig. 3

eine dritte Ausführungsform einer Wickelhülsenanordnung,

Fig. 4

eine vierte Ausführungsform einer Wickelhülsenanordnung,

Fig. 5

eine fünfte Ausführungsform einer Wickelhülsenanordnung,

Fig. 6

eine Stirnseitenansicht auf eine modifizierte Wickelhülse nach Fig. 1,

Fig. 7

einen Schnitt VII-VII nach Fig. 6,

Fig. 8

eine perspektivische Ansicht einer Wickelhülse nach Fig. 5, die entsprechend Fig. 6 modifiziert ist,

Fig. 9

ein Längsschnitt durch eine Wickelhülse mit einem weiteren Merkmal,

Fig. 10

eine Stirnseitenansicht der Wickelhülse,

Fig. 11

eine Draufsicht auf die Wickelhülse nach Fig. 10,

Fig. 12

eine gegenüber Fig. 5 abgewandelte Ausgestaltung einer Wickelhülsenanordnung,

Fig. 13

die Ausgestaltung nach Fig. 12 nach axialer Ausdehnung der Wickelhülsen und

Fig. 14

eine schematische Darstellung zur Angabe von Bemassungen.

The invention will be described below with reference to preferred embodiments in conjunction with a drawing. Herein show:

Fig. 1

a first embodiment of a winding tube assembly with two cores in the neck,

Fig. 2

A second embodiment of a winding tube arrangement,

Fig. 3

A third embodiment of a winding tube arrangement,

Fig. 4

A fourth embodiment of a winding tube arrangement,

Fig. 5

A fifth embodiment of a winding tube arrangement,

Fig. 6

an end view of a modified winding tube after Fig. 1 .

Fig. 7

a section VII-VII after Fig. 6 .

Fig. 8

a perspective view of a winding tube after Fig. 5 that accordingly Fig. 6 is modified,

Fig. 9

a longitudinal section through a winding tube with a further feature,

Fig. 10

an end view of the winding tube,

Fig. 11

a plan view of the winding tube after Fig. 10 .

Fig. 12

one opposite Fig. 5 modified embodiment of a winding tube assembly,

Fig. 13

the design after Fig. 12 after axial expansion of the cores and

Fig. 14

a schematic representation for specifying dimensions.

Fig. 1 shows a winding tube assembly 1 with two cores A, B, which abut with their end faces 2, 3 to each other. Shown is only a section of the cores, namely a portion of the axial length and a part in the circumferential direction. It is understood that the cores, as in Fig. 9 shown, are rotationally symmetrical to a central axis 4.

The winding tube A has a body 5 and an end portion 6. The end portion 6 has an end portion 7, which carries the end face 2, and a weakening zone 8. In the weakening zone 8, a triangular groove 9 is formed, which starts from the radial inner side 10 of the winding tube A. The front side portion 7 has an axial extent a. The groove 9 has a maximum axial extent b. By the weakening zone 8, a deformation zone is formed, so that the end face portion 7 can be deformed axially from the radially outer end to the body 5 out.

The groove 9 has a depth t ₁ . The depth t ₁ is greater than half the radial thickness of the body 5. In the present case, the body 5 and the end portion have the same radial extent, ie, the body 5 and the end portion 7 have both the same radial thickness. Accordingly, they can be manufactured from the same blank or hollow cylinder, into which only the groove 9 is introduced in order to form the winding sleeve A.

The winding tube B has in a corresponding manner a body 11 and an end portion 12, wherein in the end portion 12 a weakening zone 13 is formed. In the weakening zone 13, also called the deformation zone can be designated, a groove 14 is formed, which extends from the radial outer side 15 of the winding tube B. The end portion 12 also has an end portion 16 which carries the end face 3 at its axial end.

The groove 14 has a depth t ₂ which is greater than half the radial thickness of the body 11. The end face portion 16 has an axial extent c, which is generally the same size as the axial extent a of the end face portion 7. The groove 14 has a maximum axial extent d, which may be the same as the maximum axial extent b of the groove 9. Preferred values for the axial extensions ad are in the range of 1 to 4 mm, wherein the largest axial extent b, d of the grooves 9, 14 should be in the range of 1 to 3 o / oo the axial length of the cores A, B should.

If now the two sleeves A, B length due to occurring during winding of a paper web or other material web compression, then the radially outer portion of the winding tube A can deform under deformation of the front side portion 16 in the groove 14 in the winding tube B. At the same time, it is possible for the radially inner region of the winding tube B to deform into the winding sleeve A with deformation of the front side section 7 into the groove 9. In extreme cases, then the end side portions 7, 16 abut the axially inner flanks 17, 18 of the grooves 9, 14. As a rule, it will not come to that.

In areas 19, 20 is formed by the formation of the winding tubes A, B with the grooves 9, 14 a kind of hinge around which the end face portions 7, 16 can pivot respectively.

The winding tube A has at its other axial end, not shown, a configuration that in Fig. 1 illustrated embodiment of the winding tube B corresponds. The winding tube B has at its other axial end, not shown, in a corresponding manner to a configuration corresponding to the illustrated embodiment of the winding tube A. Thus, if one arranges several cores in the axial direction one behind the other, then the adjacent end portions 6, 12 each have a different configuration, so that it is possible that the cores A, B deform into each other to compensate for a length expansion can.

Fig. 2 shows a modified embodiment of a winding tube assembly 1 with two cores A, B, in which the end portion 7 extends though to the radial outer side 15 of the winding tube A. Compared to the radial inner side 10 of the winding tube A, however, it is offset radially outwards, so that in the region 20 of the winding tube B virtually no material is opposite and the winding tube B can easily deform into the winding tube A. In this embodiment, both cores A, B each have an end side portion 7, 16.

Fig. 3 shows a further modified embodiment, in which only the winding tube A has an end portion 7. The winding tube B has on its end facing the winding tube A an area 21 which is tapered conically. The radially inner end of the conical portion 21 is located radially further inward than the radially outer end of the groove 9. Accordingly, the end portion 7 can deform into the groove 9, when the sleeves A, B length.

Fig. 4 shows an embodiment in which again only the winding tube A has an end portion 7 which is deformable. The winding tube B in turn has a region 21 which is conically tapered. The end face portion 7 of the winding tube A is, as in Fig. 2 , compared to the radial extent of the body 5 radially shortened inside. The winding tube B has an axial projection 22 which fits into a free space 23 which has been cleared by the shortening of the front side portion 7.

In this embodiment, the winding tube B can penetrate with its projection 22 in the free space 23 when the winding tubes A, B are inserted axially adjacent to each other in a roll winding device. In the case of an axial expansion, the front side section 7 can then deform into the groove 9.

Fig. 5 shows a fifth embodiment of a winding tube assembly 1 with two cores A, B, which is substantially the Fig. 1 equivalent. In contrast to the embodiment according to Fig. 1 the grooves 9, 14 are rectangular, which facilitates the production. Again, a portion 19 of the winding tube A under deformation of the end face portion 16 in the groove 14 penetrate something in the winding tube B. In the same way, the region 20 of the winding tube B can penetrate under deformation of the end face portion 7 in the groove 9 in the winding tube A.

Since an elongation in the range of about 1 o / oo occurs with a one-meter-long winding tube, it means that each end of the winding tube extends by about 0.5 mm. Such an extension can be easily absorbed by the deformation of the end side sections 7, 16.

FIGS. 6 and 7 show an embodiment in which the end face portion 7 according to the embodiment of Fig. 1 additionally by radially extending Slits 24 is interrupted. Several such slots 24 are arranged distributed in the circumferential direction. As a result, the end face section 7 becomes even more yielding in the axial direction. If the two cores A, B deform into each other, then a longitudinal extension of the inner region of the end face portion 7 is required in each case only for a quarter of the circumference. The deformation is therefore opposed to a lower resistance.

Fig. 8 shows the slots 24 in the front side portion 7 in a winding tube A in the embodiment Fig. 5 ,

It is obvious that the winding tube B can be provided with corresponding slots 24.

The FIGS. 9 to 11 show an additional feature that can be used both with cores having weakened zones 8, as well as with cores, which are not provided with such weakening zones.

Fig. 9 shows a longitudinal section of a part of a winding tube 26th
Fig. 10 shows an end view and Fig. 11 shows a plan view.

From the front view it can be seen that the end face 2 of the winding tube 26 is provided with a radially directed surface structure 27. The surface structure 27 is designed here as a radially extending toothing, ie, a toothing in which both the valleys and the tips extend in the radial direction. Shown is an embodiment in which a distance x between two peaks in the range of 1 to 4 mm. The tips are opposite the front side 2 by a distance y in Range from 1 to 4 mm before, if it is a raised toothing. The valleys are offset by the same distance y opposite the end face 2 inwards, if it is a low-lying toothing. It is then used in a set of cores then preferably a raised teeth on a winding tube and a low-lying teeth on the adjacent winding tube. The gearing does not have to be aligned mathematically exactly radially. A component of the gearing in the circumferential direction is permitted, as long as the gearing allows a transmission of torque between cores.

Fig. 12 shows an embodiment of a winding tube assembly, which is substantially according to Fig. 5 equivalent. The same and corresponding parts are therefore provided with the same reference numerals.

A difference too Fig. 5 consists now in that a bottom 28 of the first groove 9 and a bottom 29 of the second groove 14 are arranged radially approximately at the same position, in the region of the respective radial centers of the body 5 and body 11. However, the bottom 29 is the second groove 14 radially by a shearing distance x radially further inside than the bottom 28 of the first groove 9. The shearing distance x is on the order of about 1 mm, that is for example in the range of 0.4 to 1.6 mm. Their size depends, inter alia, on the materials used for the body 5, 11 of the winding tube, the axial length of the end side sections 7, 16 and the radial position of the bottoms 28, 29. The shearing distance x is dimensioned such that the end face sections 7, 16 Shear when the cores A, B length in the axial direction. The resulting result is in Fig. 13 shown. If the cores have lengthened sufficiently, then the two end side portions 7, 16 are sheared off from their respective body 5, 11 and displaced into the space previously occupied by the respective groove 9, 14.

In this case, the areas 19, 20 form the axially outer end of the two cores A, B. The two areas 19, 20 then overlap in the axial direction, with a small game, namely the game of Abscherfernfernung x, stuck together and thereby centering the two cores A, B.

Fig. 14 shows once again in an enlarged view, the two cores A, B with sheared end face portions 7, 16. The body 5, 11 of each winding tube A, B is formed as a tube having a wall thickness S. The depth of the groove 9 in the first winding tube A is S / 2 + 0.5 x and the depth of the groove 14 is also S / 2 + 0.5 x.

For example, if the wall thickness S is 15 mm, then the depth of the grooves 9, 14 is 8 mm. The axial length of the grooves 9, 14 may be 1.5 mm and the axial length of the end side portions 7, 16, for example, 2 mm.

Claims (12)

1. Winding core having a body and in each case an end section at both ends having a front side section, at least one end section (6, 12) having a deformation zone via which the front side section (7, 16) is connected to the body (5, 11), a circumferential groove (9, 14) being formed between the body (5, 11) and the front side section (7, 16), the groove (9, 14) originating from the radial outer side (15) or the radial inner side (10) of the winding core (A, B),
   characterized in that
   the groove (14) in one front side section (16) originates from the radial outer side (15) and in the other front side section (7) originates from the radial inner side (10).
2. Winding core according to Claim 1,
   characterized in that
   the deformation zone is formed as a weakened zone (8, 13).
3. Winding core according to Claim 2,
   characterized in that
   the body (5, 11) is formed as a hollow cylinder and the weakened zone (8, 13) is formed by a reduction in the wall thickness of the hollow cylinder.
4. Winding core according to Claim 3,
   characterized in that
   the front side section (7, 16) is formed as a hollow cylinder having a wall thickness which is less than or equal to the wall thickness of the body (5, 11).
5. Winding core according to one of Claims 1 to 4,
   characterized in that
   the groove (9, 14) has a maximum axial extent in the range from 1 to 4 mm.
6. Winding core according to one of Claims 1 to 5,
   characterized in that
   the front side section (7) has a plurality of slots (24) running radially distributed in the circumferential direction.
7. Winding core according to one of Claims 1 to 6,
   characterized in that
   the front side section has an axially outer front side with a radially oriented surface structure.
8. Winding core arrangement for loading a roll winding device,
   characterized in that
   it has winding cores (A, B) which are formed according to one of Claims 1 to 7.
9. Winding core arrangement according to Claim 8,
   characterized in that
   the winding cores (A, B) are arranged in such a way that differently formed end sections (6, 12) are adjacent to one another.
10. Winding core arrangement according to Claim 8 or 9,
    characterized in that,
    in the case of two adjacent winding cores (B, A), one has a first groove (14) originating from the radial outer side and the other has a second groove (9) originating from the radial inner side, the first groove having a base (29) which is located radially further in by a predetermined shearing distance (x) than the base (28) of the second groove (9).
11. Winding core arrangement according to Claim 10,
    characterized in that
    both grooves (9, 14) are formed as rectangular grooves.
12. Winding core arrangement according to Claim 11,
    characterized in that
    the axial length (b, d) of the two grooves (9, 14) is equal.

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