EP1395509B1 - Method and device for turning strips - Google Patents

Abstract

The invention relates to a method for turning and reorienting the displacement direction of strips ( 1 ), especially of a thin hot strip. The strip can be turned about any angle by means of at least one deflection roller, with roller banks ( 5 ) which are arranged on the circumference of the deflection roller, and which respectively comprise a plurality of individual rollers. Plastic and elastic deformations are avoided due to the fact that the strip is supported at various points by the individual rollers of successive roller banks ( 5 ). The invention also relates to a device for carrying out the method. Said device enables the roller banks placed one after the other in the strip deflection direction to be staggered in relation to each other in such a way that the contact surfaces of their rollers with the strip are staggered from bank to bank, by one roller width ( 11,12 ).

Description

The invention relates to a device for deflecting and reorienting the running direction of bands, in particular of thin hot strip, wherein the band is deflected by at least one deflection roller by any angle, arranged on the periphery of the deflection roller Roffenbänken, wherein the band of the individual roles of successive roller banks is supported at different points, wherein the successive in Bandumlenkrichtung roller banks are arranged offset to each other so that the contact surfaces of their roles are shifted with the band of roller bank to a roll width.

Known is a Bandumlenkvorrichtung for deflecting metal bands, in which a rotatable drum is aligned with its axis inclined to the direction of the incoming tape and the tape receives on a rising at a pitch angle relative to the peripheral arc, helical path along a loop.

On the drum shell a plurality of guide pieces are arranged circumferentially next to each other and slidably in the axial direction of the drum, so that the tape is deflected according to the pitch angle and the loop at the desired angle ( DE 25 40 714 ).

An advancement is in the DE 38 27 864 C2 described. According to this embodiment, the individual rollers are mounted in roller strips and releasably secured parallel to the surface of the Umlenkzylinders to form a helically extending deflection surface and staggered.

The disadvantages of this known device for deflecting and re-direction of bands are that by the arrangements described therein the rollers or the roller banks with decreasing strip thickness plastic and elastic deformations are caused in the bands.

The band to be deflected has contact with the local rollers at all roller banks in the same place. This causes a band flatness error, especially at lower strip thicknesses.

Another disadvantage is that the rollers press off with decreasing tape thickness in the band. The distance between two adjacent rollers on a roller bench according to the known embodiments is fixed by the bearing width and the inclination angle of the rollers against the drum axis. A change in the distance between the individual roles is therefore not possible.

The document JP 09227000 A describes a helical band-shaped guide surface for laying the surfaces of steel strips on the semicircular surface of a cylindrical body with spray gas outlets for penetrating its peripheral wall at regular intervals. One end of the cylindrical body is supported by an air cylinder and a support post is located at the bottom of the other end. Upon actuation of the air cylinder, the body is placed in an inclined position from the horizontal position.

Based on the aforementioned prior art, the present invention seeks to provide a device, according to which plastic and elastic deformations that occur in particular when redirecting and converting thin ribbons are prevented.

The solution to this problem consists in a device referred to in the preamble of claim 1 in that the width of Einzeirollen different from roller bank to roller bank.

Since the band is supported by the respective rollers arranged on the gap to the previous roller bank of the successive roller banks in the course of the band deflection over its entire width, there is a significant reduction in deformation and a significant improvement in the flatness. The band can no longer, as in the known versions especially in the band edge near area particularly disadvantageous to be drawn between two adjacent rollers of a roller bank.

It is expedient here that the diameters of the individual rolls of a roll bank are different, and that advantageously the width of the individual rolls is different.

Fig. 1

als Einzelheit eine Umlenkrolle mit ein- und auslaufendem Band;

Fig. 2

die Umlenkrolle nach Fig. 1 von einer Stirnseite her gesehen;

Fig. 3

als Einzelheit der Umlenkrolle nach Fig. 2 eine Rollenbank in der Draufsicht;

Fig. 4

die Umlenkrolle nach Fig. 1 In perspektivischer Darstellung mit zusätzlicher Anordnung eines Steuerrollenstandes;

Fig. 5

in perspektivischer Darstellung die Polygonisation des Bandes um die einzelnen Rollen der aufeinanderfolgenden Rollenbänke;

Fig. 6

eine zwei aufeinanderfolgende Rollenbänke der Umlenkrolle nach Fig. 2 zeigende Abwicklung;

Fig. 7

eine Darstellung wie in Fig. 6 mit demgegenüber aber breiteren Rollen.

The invention will be explained in more detail using an exemplary embodiment. In the drawings show:

Fig. 1

as a detail, a pulley with incoming and expiring band;

Fig. 2

seen the deflection roller of Figure 1 from a front side.

Fig. 3

as a detail of the pulley of Figure 2 a roller bed in plan view.

Fig. 4

the deflection roller of Figure 1 in perspective view with additional arrangement of a Steuererrollstandes.

Fig. 5

a perspective view of the polygonization of the band around the individual roles of the successive roller banks;

Fig. 6

a two successive roller banks of the pulley of Figure 2-showing settlement;

Fig. 7

a representation as in Fig. 6 with the other hand but wider roles.

As shown in Figure 1, a belt 1 is fed at a deflection by 90 ° at an angle of 45 ° to the longitudinal axis 3 of the guide roller 2 and also discharged again at 45 °.

In this embodiment, the band 1 wraps around the deflection roller 2 over half the circumference.

The rollers 4, distributed in benches 5, are distributed over the region of the deflection roller 2 looped around by the belt 1.

2 shows an arrangement of seven roller banks 5, which are arranged at a uniform angle spaced over half the circumference of the guide roller 2.

In a deflection by 90 °, the alignment of the individual rollers 4 on a roller bank 5 is at 45 °.

According to Fig. 3, the support of the belt 1 by six rollers 4 (R1 to R6). These six rollers 4 (R1 to R6) have the same diameter 6 and the same width 7.

The distance 8 from the center width of the first roller R1 and the center width of the sixth roller R6 corresponds to the width 9 of the belt. The right and left edges of the band 1 thus rest on the center axis 10 of the rollers R1 and R6 and are supported.

In Fig. 4, a control roller stand 11 is additionally arranged, which leads to the determination of a constant train on the belt 1. Visible is the support of the edge of the band 1 by the roller 4, which is covered only on one half of the band 1.

Fig. 5 shows the band 1, as it is uniformly supported by the individual rollers 4 of the roller banks 5.

A settlement with two roller banks 5 of the deflection according to FIG. 2 is shown in FIG. In the direction 13 of the belt 1, the contact with the rollers 4 of the roller bank 5 from the first roller bank 5 to the next roller bank 5 is offset by the width of a roller 4.

However, it is also possible, as shown in Fig. 7, the width 11 of the individual rollers of a roller bank 5 with respect to the width 12 of the individual rollers 4 of the adjacent roller bank 5 perform differently.

Due to the arrangement of rollers with slightly different diameters also takes place a staggered contact between tape and rollers.

By the measures described occurring in the known devices impressions and flatness errors are avoided in particular thin hot strip.

Claims (3)

1. Device for deflecting and reorienting the running direction of strips, particularly of thin hot strip, wherein the strip (1) is deflectable by way of at least one deflecting roller (2) through a desired angle, by means of roller banks (5) arranged on the circumference of the deflecting roller, wherein the strip is supported by the individual rollers of successive roller banks (5) at different points, wherein the roller banks (5) following one another in strip deflecting direction are arranged to be so offset relative to one another that the contact surfaces of the rollers (4 or R1 to R6) thereof with the strip (1) are displaced from roller bank to roller bank by one roller width, characterised in that the width (7) of the individual rollers (4 or R1 to R6) from roller bank (5) to roller bank is different.
2. Device according to claim 1, characterised in that the width of the individual rollers (4 or R1 to R6) is different.
3. Device according to claim 1 or 2, characterised in that the diameters of the individual rollers (4 or R1 to R6) of a roller bank (5) are different.

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