EP2424689A1

EP2424689A1 - Device for compensating variations in tension and/or for adjusting tension on a conveyed flexible material strand

Info

Publication number: EP2424689A1
Application number: EP10719295A
Authority: EP
Inventors: Klaus Schmitz
Original assignee: Otto Junker GmbH
Current assignee: Otto Junker GmbH
Priority date: 2009-04-28
Filing date: 2010-04-20
Publication date: 2012-03-07
Anticipated expiration: 2030-04-20
Also published as: JP2012525261A; DE102009018914A1; US20120018564A1; DE202009009097U1; CN102413957A; WO2010124969A1; EP2424689B1

Abstract

The invention relates to a device for compensating variations in tension and/or for adjusting tension on a conveyed flexible metal material strand (M), especially a metal strip, having at least one movable dancer roll (2) wound around by the material strand. According to the invention the device is characterized in that the at least one dancer roll (2) can be displaced along a path (4) inclinable to a perpendicular, wherein the inclination angle (f) of the path can be adjusted by means of an adjustment unit.

Description

Device for compensation of tension fluctuations and / or for adjusting the tension on a conveyed flexible strand of material

The invention relates to a device for compensating Zugschwankungen and / or for adjusting the tension on a funded flexible metallic strand of material, in particular a metal strip, with at least one of the material strand umschlingbaren movable dancer roll.

Devices for compensation of Zugschwankungen and / or for adjusting the tension, for example in thermal belt treatment plants using movable pulleys, so-called dancers are known from the prior art for years and have proven themselves many times in practice.

A dancer roll arrangement comprises a roll which is integrated into the strip course of a strip treatment plant and can be acted upon by a certain force, which forms a loop in the strip whose loop length coincides with the loop

Position of the role changed. This mobility can compensate for short-term fluctuations of the strip tension. In order to adapt the tape tension to different operating conditions, it may be necessary to adjust the force exerted by the dancer roll on the tape, with thick and wide tapes requiring higher forces exerted by the dancer roll on them than delicate, thin tapes. Especially in the case of thin tapes must be through the dancer roll on sensitive band applied force to limit damage to the strip material.

For this purpose, it is known from the prior art to compensate by acting on the dancer roll counterweights or actuators in the form of hydraulic or pneumatic cylinders, the force exerted on the strip material weight of the dancer roll and their storage at least partially. In the case of counterweights this results in the problem that the inertial mass of the dancer roll assembly is further increased by the counterweight, whereby these short-term fluctuations in the strip tension due to high inertial forces can no longer compensate sufficiently. At very low band trains to be realized, in the case of actuators expended loose-plate forces and torques have a negative effect, since they also hinder the compensation of short-term fluctuations in the strip tension.

FIGS. 1 to 5 show typical dancer roller arrangements known from the prior art.

Proceeding from this, the present invention seeks to provide a device for compensating Zugschwankungen and / or for adjusting the tension on a funded flexible metallic strand of material, in particular a

Material band specify, which is very simple and thus can be integrated with little effort into existing treatment facilities for metallic material strands, especially metal bands. Furthermore, the device should compensate for short-term

Zugschwankungen with thick, heavy as well as thin, sensitive material strands allow, including a Changing the material strands during operation with appropriate adjustment of the tension should be easily possible.

The object is achieved with a device according to the preamble of claim 1, characterized in that the at least one dancer roll along a path inclinable to the vertical path is displaceable, wherein the inclination angle of the web is adjustable by means of an adjustment.

The present invention is based on the idea that by a suitable inclination of the direction of movement of the dancer to the vertical and thus the weight force vector of the dancer a precise adjustment of the web train without additional, the inertial mass of the arrangement increasing weights and without actuators is possible.

As a metallic material strand in the context of the present invention, wire or tape-shaped material, tapes for transporting goods of various kinds, but also metal cables, wires and the like understood.

By appropriate adjustment of the inclination angle of the web, along which the dancer roll is displaced, for example, in the case of thick, heavy strands of material, the full weight of the dancer role and their storage to produce a sufficient Strangzuges (strip tension) can be exploited by namely the inclination angle is reduced to zero , so that the dancer roll is displaceable in the vertical direction. For thin, very sensitive

Bands can be increased according to the inclination angle up to near 90 °, so that the weight of the dancer roll and their storage has virtually no influence on the Strangzug and this is correspondingly minimal. The respective effective tensile force can be determined with a simple trigonometric equation from the weight of the dancer roll and its storage. It corresponds to the slope force on an inclined plane and is calculated to

F _z = F _G 'cosφ

with F _G = weight of the dancer roll and its storage; φ = angle of inclination of the web to the vertical (0 <φ <90 °).

By a possible frictionless as possible storage of the dancer roll on the tiltable to the vertical path can be compensated for in addition to a precise adjustment of the Strangzuges simultaneously fluctuations in the web of the flexible material strand.

Preferably, the adjusting unit for adjusting the

Angle of inclination of the web formed controllable, i. a change in inclination can be triggered by a corresponding control command in the automated operation of a treatment plant for the metallic material strands, in particular a strip processing plant. This is particularly advantageous if, during continuous operation of the treatment plant, a change in the material strand takes place, the ends of both strands being stapled to one another.

According to a further advantageous embodiment of the invention, the dancer roll between two pulleys is arranged so in operation, the flexible metallic strand of material forms a band loop together with the dancer roll. In such a known arrangement with known dancer rolls, especially in strip processing plants, it has proved to be particularly advantageous that with the dancer roll displaceable on a path which can be tilted to the vertical according to the invention, its wrap angle is relatively constant both during the dancer movement along the inclinable path and during the adjustment of the inclination angle can be held, so that the forces exerted on the material strand tensile forces are precisely controlled at any time.

According to a further embodiment of the invention, the inclinable to the vertical path is linear. In a strictly linear trained train, such as a

Linear guide, the set to vertical inclination angle is maintained regardless of the current position of the dancer roll in the dancer movement precisely, so that the continuously applied to the flexible material strand tensile force exactly by the choice of

Inclination angle of the train preset value corresponds. This can be realized constructively, for example, by the bearing of the dancer roller being guided essentially without friction on a linear guide. Linear motion guides are particularly suitable for this purpose. Structurally different linear guides can also be used as "linear guides", for example roller guides and rail guides of all kinds, as well as sliding guides or also air cushion guides or magnetic guides

Dancer roll be guided in a linear slot or in a gap between two mutually parallel carriers.

According to a further embodiment of the invention, the adjusting unit may comprise an electromechanical drive, in particular a spindle drive, or an actuator, in particular a hydraulically or pneumatically operated cylinder, so that the linear guide for adjusting the inclination angle of the web is pivotable about a pivot point. Such a pivoting mechanism can be realized structurally simple and is also easily integrated into a general machine control.

As an alternative to the above, the path inclinable to the vertical can be curved, in particular curved in a circular arc, the radius of curvature being large in relation to the arc

Dancer roll deflection along the curved path must be selected. A suitable ratio between radius of curvature and dancer roll deflection is about> 3: 1. With a corresponding choice of the radius of curvature relative to

Deflection of the dancer roll moves this to a good approximation on a still substantially linear path, so that the angle of inclination to the vertical is still defined. Constructively, this variant can be realized by using a rocker on which the bearing of the

Dancer role is performed, the pivot point of the rocker for adjusting the inclination angle of the web on which the dancer roll is displaced, in turn is displaced. In particular, the adjusting unit may comprise an actuator, so that the pivot point of the rocker along a linear, substantially vertically oriented trajectory is displaced. This has the advantage that in particular at an arrangement with two adjacent pulleys the wrap angle, ie the angle at which the dancer roll is wrapped by the flexible strand of material, regardless of the position of the swing pivot point and thus the inclination angle of the web is practically constant.

As an alternative to a linear displacement of the swing fulcrum, the adjustment unit may comprise an actuator whose kinematics make it possible for the pivot point of the rocker, at the end of which the dancer roll is arranged, to be displaced along a curved, substantially vertically oriented path curve. This trajectory can be predetermined by a further rocker, on which the pivot point is pivotally mounted.

When using the dancer roller to adjust the web tension in very heavy flexible metallic material strands that require corresponding tensile forces, it may be appropriate to displace the at least one dancer roll along the path inclinable to the vertical by the action of an actuator, in particular a hydraulic or pneumatic cylinder , This opens up the possibility, in addition to the force generated by the dancer roll itself, i. the downgrade force on the tiltable track to generate another force that increases the train. It makes sense to use the actuator when a vanishing tilt angle is selected, i. E. the full weight force acts on the flexible metallic strand of material.

Another aspect of the present invention relates to a treatment plant for sheet-like metallic material with a device for adjusting the tension and / or for compensation of tension fluctuations in the web-shaped material according to one of claims 1 to 10.

For the treatment plant, the advantages mentioned above apply accordingly.

The above-mentioned object is procedurally achieved with a method for operating a treatment plant for flexible metallic material strands, in particular metal strips, with a device for adjusting the tension and / or compensation of tension fluctuations in the material strand according to one of claims 1 to 11, characterized in that when changing the material strand during operation of the treatment plant, the adjustment of the tension by adjusting the inclination angle of the web by means of the adjustment takes place.

The decisive advantage of the method is that due to the possibility of adjusting the tension during operation of the treatment plant no risk of damage to sensitive material strands due to excessive tensile forces, as in a change from heavy, durable material strands on lighter sensitive strands during operation always an optimal strip tension is set. Incidentally, reference is made to the advantages of the method to the above.

In the following the invention will be explained in more detail with reference to a drawing examples. Show it: Fig. 1 is a known from the prior art

Dancer roll arrangement for sheet material with a linear and vertical displaceable dancer roll in a schematic side view,

Fig. 2 is a second known from the prior art

Dancer roll arrangement for web-shaped material with a dancer roll held on a horizontal rocker,

3 shows the dancer roller assembly of FIG. 1 with a counterweight,

FIG. 4 shows the dancer roller arrangement from FIG. 2 with a counterweight, FIG.

5 shows the dancer roller arrangement from FIG. 2 with an actuator, FIG.

Fig. 6 shows a device for compensation of

Zugschwankungen and for adjusting the tension on web-like material with a displaceable along a trajectory inclined to the vertical path dancer roll according to a first embodiment,

7 shows the device from FIG. 6 with an actuator for increasing the tension, FIG.

Fig. 8 shows a device for compensating Zugschwankungen and for adjusting the tension on web material in a second embodiment and 9 shows a treatment system for metallic belts with a device for adjusting the tension and for compensation of tension fluctuations according to FIG. 6.

1 shows a dancer roller arrangement known from the prior art with a dancer roller 100 arranged between two deflection rollers 110, 120. The belt M, in this case a metal belt, which is guided essentially horizontally in a belt treatment system (not shown in detail) is replaced by the deflection roller 110 deflected downwards from the horizontal direction in the vertical direction, the dancer roll 100 wraps around with a wrap angle in the range of 180 ° and is then led up to the vertical slightly inclined to the second guide roller 120, where it is deflected in the horizontal direction.

In the arrangement of FIG. 1, the dancer roller 100 can be displaced on a vertically oriented linear guide 130, so that approximately the entire weight force of the dancer roller 100 and its bearing 110a acts on the metal band M. This can lead to unacceptably high belt tension, especially for thin and correspondingly sensitive metal bands.

The same problem also arises in the known from the prior art dancer roller assembly of FIG. 2, in which the turn between two pulleys 210, 220 arranged dancer roll 200 is guided at the outer end of a rocker 230 on a circular path section, wherein the rocker 230 in turn pivotable at a pivot point 240 is stored. As can be seen in FIG. 2, the entire weight of the dancer roll 200 and its suspension on the rocker 230 acts as a tensile force on the metal strip M.

In Fig. 3, a further known from the prior art solution is shown. Here, the force acting on the metal strip M weight of the dancer roller 100 and its storage on the linear guide 130 is compensated by a counterweight 140, wherein the counterweight 140 may be selected such that the resulting acting on the metal strip M tensile force corresponds to the desired value. The problem with this arrangement is that the inertia of the dancer roller assembly is increased accordingly by the counterweight, so that in the compensatory movements of the dancer roller 100 the

Inertia force of both the dancer roll 100 itself and the counterweight 140 must be overcome. This ultimately leads to short-term fluctuations in the strip tension can not be compensated in a satisfactory manner due to inertia.

Fig. 4 shows the dancer roller assembly of Fig. 2, here the rocker 230 'is extended beyond the pivot point 240 addition, and a weight 250 along the rocker 230' is displaced so that it by the weight of the dancer roll on the band M exerted tensile force by a corresponding counter-torque increased or attenuated.

Fig. 5 shows again the dancer roller assembly of Fig. 2, in which case an actuator 260 in the form of a hydraulic or pneumatic cylinder engages the rocker 230 and thus in analogous to Fig. 4 way to the tape M through the dancer roll 200 exerted or exerted weaker tape tensile force.

In Fig. 6 is a device for compensating Zugschwankungen and for adjusting the tension on web material present a metal strip M - shown with a displaceable along a tiltable path to the vertical dancer roller 2 in a first embodiment. The metal strip M is guided for this purpose around a deflection roller 3 and then forms with the dancer roll 2 a

Belt loop with a wrap angle in the range of 180 °, before it is deflected over another roll 1 again. In the present case, the deflection takes place in a direction inclined to the horizontal direction. It is understood, however, that a deflection in the horizontal or in another direction is also possible.

The inclinable path of the device of FIG. 6 is presently designed as a linear guide 4, on which the dancer roller can be moved substantially without friction by means of a subframe 2 a, on which the bearing blocks of the dancer roller are arranged. The linear guide 4 can be pivoted to adjust the inclination angle φ about a pivot point X by means not shown in detail, an electromechanical drive, in particular a spindle drive, comprehensive adjustment.

If, therefore, the strip tension on the dancer roller 2 must be preset for a given strip material and given strip thickness, the angle of inclination φ for the linear unit 4 is adjusted such that the resulting tensile force F ₂ corresponds to the required value. Fz is calculated to F _z = G 'cosφ,

where G is the weight of the dancer roller 2 and its bearing and φ is the inclination angle of the linear guide 4.

As a result, a precise adjustment of the tape tension is up to a maximum value, which is determined by the weight of the dancer and its storage, without the use of additional weights or actuators possible. Due to the substantially friction-free mounting of the dancer roller 2 on the linear guide 4 short-term fluctuations in the strip tension can be compensated in the usual way.

In the present case, the adjusting unit is designed to be controllable. This means that when changing the strip thickness or - width - here are the ends of different thicknesses or broad bands stapled together - on a control command of the general machine control out the appropriate adjustment of the strip tension by changing the inclination of the linear guide 4 during operation of a strip processing plant (see Fig. 9) can take place.

In FIG. 7, the device from FIG. 6 is additionally provided with an actuator in the form of a pneumatic cylinder 5. This is used when the produced by the full weight of the dancer roll 2 and their storage strip tension is not sufficient, which may be the case for example in the treatment of thick and very heavy metal bands. As can be seen in Fig. 7, the full weight of the dancer roller 2 and its storage can be used for the strip tension first, if an inclination angle φ = 0 is set so that the linear unit 4 is vertically aligned. If the strip tension produced as a result is not yet sufficient, an additional force can be exerted on the dancer roller 2 via the actuator 5, so that the strip tension is reinforced to the required extent. The resulting belt tensile force is thus calculated to

F ₂ '= G + F _A with F _A : force exerted by the actuator 5 on the dancer roller 2.

FIG. 8 shows a further device for compensating for tension fluctuations and / or for adjusting the tension on a metal strip in a second embodiment. This differs from that of FIG. 6 in that the dancer roller 2 can not be moved along a linear unit without friction, but is suspended on a rocker 6 whose length is chosen to be large compared to the adjustment range of the dancer roller 2, so that the deflections of the dancer roller 2 in the operation of the device to a good approximation are linear. A suitable ratio between

Radius of curvature and dancer roll deflection is approximately> 3: 1. The inclination to the vertical of this quasi linearly deflectable dancer roll 2 can now be adjusted again to exert the desired strip tension on the metal strip M. For this, the suspension of the rocker, i. their fulcrum, along a predetermined trajectory by means of an adjusting unit, not shown movable.

In Fig. 8, two differently set inclination angle φ, φ 'are shown. In the first case, the subframe 6a of the rocker 6 is moved to a lower position A, which is a comparatively small angle φ «30 ° equivalent. The band tensile force attributable to this angle can be calculated with F = G 'cosφ. If the strip tension exerted on the metal strip M by the dancer roll 2 is to be reduced in a certain way, the subframe 6a of the rocker 6 is moved into an upper position B by means of an adjusting drive of the adjusting unit which corresponds to an enlarged angle φ '' 50 °. The resulting tensile tensile force F 'is calculated as F' = G 'cosφ' and is smaller than the tensile force F calculated for position A.

It is understood that the movement of the subframe βa can be effected by an electromechanical drive as well as by a hydraulically or pneumatically operating cylinder (both not shown in FIG. 8) of the adjusting unit.

The advantage of a vertically arranged linear unit 7, along which the pivot point of the rocker 6 can be displaced, is that in the present arrangement with two adjacent pulleys 1, 3, the wrap angle for the dancer roll 2 is substantially constant regardless of the position of the swing fulcrum can be held.

Finally, FIG. 9 shows a treatment system for metallic strips with a device according to FIG. 6. In this case, the metal strip M, for example a copper or copper alloy strip, is unwound from a first roll 10 and first passed through an oven 12, for example an annealing furnace. Then, the band M is deflected on the roller 3 and forms with the dancer roller. 2 a loop, wherein the dancer roller 2 in the manner described in connection with FIG. 6 along a to the vertical by the angle φ by means of a controllable by the general machine control adjustment unit (not shown) track is displaceable. Then, the metal strip is deflected by a further roller 1 back into the horizontal and finally wound up by a second roller 10. In the present treatment plant for metallic bands thus precise pre-adjustment of the strip tension and its controlled change is possible with changed operating parameters.

When changing the metal strip M, which requires an adjustment of the strip tension during operation of the strip treatment plant of FIG. 9, sends the general

Machine control a corresponding control command to the adjustment for the adjustment of the inclination angle φ of the tiltable track, whereupon this adapts the inclination angle φ accordingly, so that the dancer roller 2 always exerts an optimal strip tension on the metal strip M.

Claims

claims

1. A device for compensating Zugschwankungen and / or for adjusting the tension on a funded flexible metallic material strand (M), in particular a metal strip, with at least one of the material strand umschlingbaren movable dancer roll

(2), that is, the at least one dancer roll (2) is displaceable along a path (4) inclinable to the vertical, the inclination angle (φ) of the web being adjustable by means of an adjustment unit.

2. Device according to claim 1, characterized in that the adjusting unit is designed so as to be controllable.

3. Apparatus according to claim 1 or 2, wherein the dancer roller (2) is arranged between two deflection rollers (1, 3), so that in operation the flexible metallic material strand (M) forms a strand loop together with the dancer roller (2).

4. Device according to one of claims 1 to 3, characterized in that the tiltable to the vertical path (4) is linear.

5. Device according to claim 4, characterized in that the bearing of the dancer roller (2) is guided substantially without friction on a linear guide (4).

6. Device according to claim 5, characterized in that the adjusting unit has an electromechanical drive,

.0 in particular a spindle drive, or an actuator, in particular a hydraulically or pneumatically operated cylinder comprises, so that the linear guide (4) for adjusting the inclination angle (φ) about a pivot point (X) is pivotable.

.5

7. Device according to one of claims 1 to 3, d a d u r c h e c e n e z e c h e n e, s t a s s the inclinable to the vertical path, in particular circular arc-shaped curved, the radius of curvature

Ϊ0 is chosen large against the deflection of the dancer roll (2) along the curved path.

8. The device according to claim 7, characterized in that! 5, the bearing of the dancer roller (2) is guided on a rocker (6), wherein the pivot point of the rocker for adjusting the inclination angle (φ) is displaceable.

9. Device according to claim 8, characterized in that the adjusting unit comprises an actuator, so that the pivot point of the rocker (6) along a linear, substantially vertically oriented trajectory (7) is displaceable.

10. The device according to claim 8, characterized in that the pivot point of the rocker (6) can be displaced by means of the actuating drive of the adjusting unit along a curved, substantially vertically oriented path curve.

11. The device according to claim 1, wherein the at least one dancer roll is displaceable along the path that can be inclined to the vertical by the action of an actuator, in particular a hydraulic or pneumatic cylinder.

12. Treatment plant for web-shaped metallic material with a device for adjusting the tensile stress and / or for compensation of tension fluctuations in the web-shaped material according to one of claims 1 to 11.

13. A method for operating a treatment plant for flexible metallic material strands, in particular metal bands, with a device for adjusting the tension and / or to compensate for tensile variations in the material strand (M) according to one of claims 1 to 11, characterized in that when changing the Material strands (M) during operation of the treatment plant, the adaptation of

Tensile stress is achieved by adjusting the inclination angle (φ) of the web by means of the adjusting unit.