EP0129209A2 - Strip accumulator - Google Patents

Abstract

In a band storage machine for the intermediate storage of band-shaped material in continuously operated processing lines, in particular when feeding band plate to pipe welding machines, with two concentrically arranged roller baskets for winding up the band and removing the band via a lateral offset guide arranged in the inner basket, there is the problem of a nodding off and further impairments avoid the course of the tape and treat the tape as gently as possible. To solve the task of therefore only pulling the tape in the storage, the outer roller cage (17) is rotatably arranged around the inner roller cage (18), and the tape (15) is starting from the unwinding point (13) in the so-called bypass between the rollers (21, 22, 23, 24) across the circular disc formed by the roller baskets including the lateral offset guide (25) to the processing machine, as long as storage is not needed, while the outer roller basket or loading basket (17) rotates when storage is required and winding the tape onto the concentric roller baskets by means of at least one loading roller (22).

Description

The invention relates to a band storage machine for the intermediate storage of band-shaped material in continuously operated processing lines, for example when feeding band plates to pipe welding machines, with two concentrically arranged roller baskets for winding the band and removing the band via a lateral offset guide arranged in the inner basket.

Tape stores serve the purpose of allowing the next tape to be steadily attached to the end of the previous tape without stopping the processing line. In the steel and non-ferrous metal industry, this involves welding a new coil to the end edge of a coil being processed, e.g. B. in the manufacture of longitudinally welded pipes. Here the preparation of the strip ends and the welding of a new coil takes about 2 - 4 minutes, during which the joint and welding point must not move significantly.

Older known tape storage devices are designed as a loop pit, loop scaffold or loop carriage, which among other things has the disadvantage of requiring a large amount of space.

Also known is a tape storage device with a lying tape guide, i. H. the tape rests on a long edge in the memory. The storage device has the shape of a standing cylinder, in which the band forms a spiral. A so-called driver is provided for transporting the belt, which feeds the belt in a sliding manner into the cylinder. This requires a corresponding stiffness of the strip material, so that there are limits to the strip thickness downwards. In addition, it is disadvantageous that the band edge lying on it is often damaged and that relative movements take place between the individual band windings.

A number of disadvantages of the aforementioned known tape storage devices are avoided by a tape storage machine which has become known as a free loop tape storage device. This type has the generic features mentioned at the outset, namely two concentrically arranged roller baskets, which in the known machine are fixedly arranged around a horizontal central axis, so that it is a lying drum which does not move itself. Here, too, the tape is pushed into the memory by a driver, first on the inside of the outer roller basket, where it forms a tape roll that grows outwards. From there, the belt merges freely via one running ribbon loop to the outside of the inner roller basket and also forms a ribbon roll there. The belt leaves the store via the lateral offset guide arranged in the inner basket and runs from there to the processing machine. This known type of tape storage has a comparatively large storage capacity in relation to its space requirement. The sliding feeding of the tape into the memory is and remains a disadvantage, so that with certain tape data it is not possible to avoid the tape breaking out or being compressed laterally. Furthermore, with small strip thicknesses, there is a risk that the outer coil in the upper area of the outer basket will drop down under its own weight and thereby block the path of the freely rotating ribbon loop.

The invention has for its object to provide a tape storage machine of the type specified, in which the tape is transported by pulling and is treated particularly gently on the whole. The advantage of a large storage capacity in a small space should be retained.

The achievement of this object, including advantageous refinements and developments, is evident from the content of the claims, which precede this description.

In contrast to the known spiral tape storage devices, the invention has the advantage that the tape during the time in which storage is not required because the end of the coil is not yet present, with the exception of the necessary lateral offset guidance can run in a straight line by crossing the two roller baskets in the so-called bypass. This is associated with a very important protection of the tape, which is reflected in the quality of the product made from the tape. It is equivalent to the fact that the tape is only pulled through the memory, both in the bypass mode and in the memory mode. As a result, the strip material is also stressed considerably less than in the known storage devices. In addition, this type of treatment can also process tapes with critical data, which has not previously been the case to the same extent. This is a consequence of the rotating outer roller basket acting as an active loading basket. The effort for a driver corresponding to the known free loop tape storage is eliminated.

• Fig. 1 zeigt eine Seitenansicht des Ladekorb-Bandspeichers mit vollem Coil und Bypass-Betrieb;
• Fig. 2 zeigt eine Ansicht des Bandverlaufes von oben;
• Fig. 3 zeigt eine Seitenansicht der Bandspeichermaschine entsprechend Fig. 1, aber mit fast leerem Coil und Speicherbetrieb;
• Fig. 4 zeigt ein Schema der Rollenstellungen der Ladekörbe in verschiedenen Speicherphasen.

In the drawing, an embodiment of the invention is shown in a simplified and partially schematic representation, which is explained below:

• Fig. 1 shows a side view of the loading belt conveyor with full coil and bypass operation;
• Fig. 2 shows a view of the tape course from above;
• Fig. 3 shows a side view of the tape storage machine corresponding to Fig. 1, but with the coil and storage operation almost empty;
• 4 shows a diagram of the roller positions of the loading baskets in different storage phases.

A strip storage machine 10, which is connected to a strip steel processing line, the other components of which are not shown in the drawing, is set up on a factory floor 11 and works in the drawing in the direction of the arrow 12 from left to right. In front of the machine 10 there is an unwinding device 13 for steel strip coils 14, from which a strip 15 to be processed is drawn off, passed through the machine 10 and transported according to arrow 12 to the next station of the processing line. In the case of a production line for the production of longitudinally welded pipes, the strip 15 reaches beyond the arrow 12 to a pulling device, not shown, which provides the tensile force for transporting the strip 15 through the strip storage machine 10.

The machine 10 has a base frame 16 on which two roller baskets are mounted, namely an outer or loading basket 17 and an inner basket 18. While the inner basket 18 is stationary, i. H. is arranged non-rotatably, the outer basket 17 can rotate about the inner basket 18 by being rotatably mounted accordingly. The common center axis of both baskets 17, 18 runs horizontally, which results in an upright arrangement of the tape store and the tape 15 is guided lying flat.

The roller baskets consist of circular base plates and rollers attached to them at right angles along a circular line, which run on corresponding axle bolts. The outer basket 17 has an annular base plate 19 which encloses a circular disk-shaped base plate 20 of the inner basket 18 with its central opening. Both base plates 19, 20 are arranged in alignment with one another. The base plate 19 of the outer or loading basket 17 carries a ring of, for example, twenty-four support rollers 21, of which only eleven are shown in the drawing for the sake of simplicity, and also a loading roller 22 which has a larger diameter than the support rollers 21. The base plate 20 of the inner basket 18 is equipped with, for example, thirteen (here seven) support rollers 23 and a support and deflection roller 24, the latter taking a fixed position, which will be explained later.

In the center of the inner basket 18 on the base plate 20 is a side offset guide 25 in the form of an obliquely to the center axis of the roller baskets 17, 18 in the direction of the arrow 12 towards the pin of a comparatively large diameter, around which the band 15 is looped once, so that it is displaced towards the open side of the roller baskets (FIG. 2), to such an extent that the band 15 emerges from the ring of rollers 21, 23.

On the path of the belt 15 from the coil 14 to the outer or loading basket 17, a cross cutting and welding machine 31 is set up in front of the machine 10 for the production of the belt connection, and an auxiliary roller 26 with a belt stopper 27 is arranged on the machine 10, between which the tape runs through. Such an auxiliary roller can also be provided on the opposite side of the outer basket 17, but this is not necessary in the exemplary embodiment shown in the drawing.

To drive the loading basket 17 when it rotates around the inner basket 18, an electric motor (not shown) is provided, which is located on the rear of the machine 10 and is controlled in a manner to be described. The rollers 21, 22, 23, 24 and 26 are as such not driven, but rotate under the action of the belt 15 running over them. The lateral offset guide 25 also does not have its own drive. Finally, this also applies to the unwinding device 13 with coil 14.

Not shown in the drawing, but can be seen functionally from FIG. 4, are conventional spreading devices for the roller baskets 17, 18. This has the effect that each roller of these baskets can move to a certain extent along a radial line on the relevant base plate 19, 20 , so that the increasing diameter of the tape wraps on the reel baskets are taken into account appropriately. The spreading of the rolls can be carried out, for example, by means of pneumatic devices, the rolls 21, 22, 23, 24 corresponding to the increasing inside diameter of the tape roll.

The wall thickness of the strip sheets to be processed is usually above 0.2 mm. In the case of a pipe mill, speeds of between 25 and 180 m / min are used depending on the sheet thickness. The speed of feeding the tape into the tape storage device can currently reach 500 m / min. Up to about 1,000 m of tape can be accommodated in a tape storage device of the present type. 4th

• Vom Coil 14 aus wird das Band 15 in Pfeilrichtung 12 in der aus Figur 1 ersichtlichen Weise in die Bandspeichermaschine 10 eingefädelt. Dabei verläuft es in einer geraden Linie durch die Maschine, wobei es ungefähr in der Bitte um die Seitenversatzführung 25 geschlungen ist. Beim Eintritt in die Maschine liegt das Band 15 auf der Hilfsrolle 26 auf und läuft dann unter der Laderolle 22 hindurch, hinter der es wiederum auf der Stütz- und Umlenkrolle 24 auflagert. Im Bereich des Pfeiles 12 wird das Band von der nicht dargestellten Vorziehvorrichtung der anschließenden Rohrschweißmaschine erfaßt. Wesentlich ist die in Figur 1 gezeigte Stellung der Laderolle 22 im Verhältnis zum Band 15, welches sich im übrigen frei zwischen den Stützrollen 21, 23 der Rollenkörbe 17, 18 hindurcherstreckt. Dieser freie Weg des Bandes 15 wird hier als Bypass bezeichnet, weil er die zum Speichern bestimmten Bauteile der Maschine 10 umgeht.

In operation, the tape storage machine described works as follows:

• From the coil 14, the tape 15 is threaded into the tape storage machine 10 in the direction of the arrow 12 in the manner shown in FIG. It runs in a straight line through the machine, roughly looping in the request for the side offset guide 25. When entering the machine, the belt 15 rests on the auxiliary roller 26 and then runs under the loading roller 22, behind which it in turn rests on the support and deflection roller 24. In the area of arrow 12, the strip is gripped by the pulling device (not shown) of the subsequent pipe welding machine. What is essential is the position of the loading roller 22 shown in FIG. 1 in relation to the belt 15, which for the rest extends freely between the support rollers 21, 23 of the roller baskets 17, 18. This free path of the belt 15 is referred to here as a bypass because it bypasses the components of the machine 10 intended for storage.

The situation shown in FIG. 1 represents the ready position of the tape store. In this position, the tape 15 is pulled off the coil 14 practically directly from the coil 14 without the roller baskets 17, 18 functioning; the tape 15 is simply pulled through the machine 10. This ensures maximum protection of the belt and storage machine as well as a corresponding energy saving.

Only when the coil 14 in bypass operation has been processed to such an extent that there is only the strip length just sufficient for a storage filling, is storage initiated, whereupon the machine automatically switches from bypass operation to storage operation. It is triggered by a start signal due to the cooperation of a follower on the tape 15, not shown, with a _I mpulsqebers Tact switch, also not shown, on the unwinding device 13. The storage process is initiated automatically as a function of the inner diameter of the coil 14 lying on top of it. The required values are entered into a control unit (not shown) after they have been taken from a table provided. Because of this, the tape storage is always started at the right moment so that it can perform its storage task with the aim of reliably pinning the next tape.

After the start command has been given, the loading basket 17 is rotated, namely counterclockwise as shown in FIG. 1, whereupon the store is loaded with tape supply. The loading roller 22 lies from above on the belt 15 and pulls it down between the auxiliary roller 26 and the support and deflection roller 24 (see FIG. 4) and to the left in a circle both on the outside of the support rollers 21 of the outer or loading basket 17 as well as on the outside of the support rollers 23 of the inner basket 18 along, so that with several revolutions of the loading basket 17 with loading roller 22, a band wrap 28, 29 forms on both baskets, the number of band layers in the two windings always being the same and - Which is an important advantage - there is no relative movement between the individual belt layers.

Since during the filling process, tape is continuously drawn from the memory to the processing machine in the direction of the arrow 12, the filling of the memory must take place correspondingly quickly, ie the loading basket 17 with the loading roller 22 must rotate correspondingly quickly. The coordination of these speeds can be done with conventional electrical or electronic measures are carried out.

The tape 15 is removed from the storage device in the direction of the arrow 12 via the support and deflection roller 24 from the inside of the tape roll 29, which is located on the inner basket 18. Since the loading basket 17 continuously winds up further layers of tape from the outside onto the inner tape roll 29 via the loading roll 22, the outside diameter of this roll increases continuously. The internal diameter of the winding 29, which also increases due to the continued strip removal in the direction of the arrow 12, is compensated for by the pneumatic spreading of the support rollers 23 of the inner basket 18 already mentioned. At the same time, however, the diameter of the outer tape roll 28, which is located on the support rollers 21 of the outer basket 17, also increases, because the layers applied to the inner tape roll 29 from the outside by the loading roller 22 are removed from the inside of the tape roll 28 of the loading basket 17, whereas Additional tape layers can be applied from the coil 14 to the outside of the tape roll 28 via the auxiliary roller 26. To compensate for the increase in the inner diameter of the tape roll 28, the support rollers 21 and the loading roller 22 can also be pneumatically expanded. .

Belt take-off, inner basket and loading basket roller spreading and band feeding by loading basket rotation take place simultaneously in a coordinated manner, so that there is a corresponding movement play of all parts.

As soon as the outer diameter of the outer tape roll 28 has reached a certain dimension, the propulsion begins of the loading basket 17 is switched off automatically, ie the storage has now reached its highest filling level. The stopper 27 is activated and holds the rest of the strip 15 coming in from the now empty coil 14 so that the beginning of the next coil can be welded on. To accelerate this process, the unwinding device 13 is conventionally set up in such a way that it keeps the new coil ready when the old strip is nearing its end. A new coil 30 is arranged in FIG.

Even while the new strip is being welded onto the coil 30, the processing machine continues to pull strip out of the store in the direction of the arrow 12 at unchanged speed. However, since the supply of tape on the inlet side via the auxiliary roller 26 is stopped, the loading basket 17 with the loading roller 22 is now inevitably towed in the opposite direction, i.e. clockwise, which results in the effect that the stored tape 15 turns by turn over the loading roller 22 is rewound from the inside of the outer roll 28 to the outside of the inner roll 29. The two tape windings are now becoming ever thinner, and after numerous rotations to the right, the loading roller 22 finally only has to deal with a single layer of tape before it - electronically controlled - returns to the rest or bypass position shown in FIG. 1 with slow braking. This clears the memory, the stopper 27 is automatically released in time, and the machine works with the belt of the new coil 30 again in bypass mode until the next memory game is initiated.

As soon as the loading basket 17 stops again and the belt 15 carries the roller baskets without touching the support rollers 21, 23 passes through, these are pneumatically returned from their spread position to their initial position.

If the new coil 30 has different values, in particular different thickness and different inside diameter of the coil, only the setting values for the storage connection, for the propulsion and braking moments of the loading basket 17 and for the spreading pressures of the rollers of the roller baskets 17, 18 need to be changed , which can easily be done using the table already mentioned. If the bandwidth also changes, the side guide rollers (not shown in the drawing) must also be adjusted in a conventional manner. The time required for a complete changeover is still only about ten minutes.

If the local conditions call for it, the _L adekorb tape storage machine 10 may compared with the representation in Figures 1 - 3 are carried out with the reverse working direction, the tape transport to the processing machine that is from right to left, so that the rotating load basket 17 during the filling of the memory rotates counterclockwise. Alternatively, it is also possible to arrange the base plates 19, 20 and thus the roller baskets 17, 18 horizontally or horizontally, an upper band guide and its adjustability on the rollers then not being necessary.

Since the tape is only transported in a pulling manner, namely during the bypass operation by the processing machine and during storage operation via the rotating loading roller 22, there is also no need to mechanically adjust the tape storage device to a changed tape thickness. Rather, it only needs the relevant drive power to be adjusted, for which a potentiometer or something similar is sufficient in a conventional manner. Even very thin tapes can be stored without any problems, since they cannot crease due to the fact that they are only transported by pulling, ie the minimum tape thickness to be processed is only determined by the material strength. Since there is no relative movement of the winding layers, tearing is practically impossible.

• A = Innenkorb-Mindestmaß im Bypass-Betrieb am Anfang des Speicherspieles
• B = Ladekorb-Mindestmaß im Bypass-Betrieb am Anfang des Speicherspieles
• C = Größter Hub des Innenkorbes 18
• D = Größter Hub des Ladekorbes 17
• E = Größtes Ausmaß des inneren Bandwickels 29 am Ende des Füllvorganges
• F = Bis hierher hat die Verarbeitungsmaschine am Ende des Füllvorganges das Band 15 abgezogen
• G = Größtes Maß des Innenkorbes 18 am Ende des Speicherspieles, wenn der Speicher leer ist
• H = Stellung des Ladekorbes 17 am Ende des Füllvorganges
• J = Größtes Maß des Ladekorbes 17 am Ende des Speicherspieles, wenn der Speicher leer ist.

The positions of the relevant parts of the roller baskets 17, 18, in particular the support, loading and deflecting rollers 21, 22, 23, 24 and of the belt 15 and the belt rolls 28, 29, are shown diagrammatically in FIG. The positions have the following meaning:

• A = inner basket minimum dimension in bypass operation at the beginning of the memory game
• B = minimum loading basket size in bypass mode at the beginning of the memory game
• C = largest stroke of inner basket 18
• D = Largest stroke of the loading basket 17
• E = largest dimension of the inner tape roll 29 at the end of the filling process
• F = Up to this point, the processing machine has pulled off the belt 15 at the end of the filling process
• G = largest dimension of the inner basket 18 at the end of the memory game when the memory is empty
• H = position of the loading basket 17 at the end of the filling process
• J = Largest dimension of the loading basket 17 at the end of the memory game when the memory is empty.

The directional arrows at the three positions of the loading roller 22 indicate the direction in which the loading basket 17 rotates with the loading roller 22 in the respective phase of the memory game.

The features disclosed in the above description and in the patent claims, in the following summary and in the drawing can be essential both individually and in any combination with one another for realizing the invention in its various embodiments.

Claims (12)

1. Belt storage machine for the intermediate storage of band-shaped material in continuously operated processing lines, for example when feeding strip plate to pipe welding machines, with two concentrically arranged roller baskets for winding up the band and removing the band via a side offset guide arranged in the inner basket, characterized in that the outer roller basket (17) rotatably arranged around the inner roller cage (18) and the belt (15) starting from the unwinding point (13) in the so-called bypass between the rollers (21, 22, 23, 24) across across from the roller baskets (17, 18) formed circular disk including the lateral offset guide (25) is guided to the processing machine as long as storage is not required, while when storage is required the outer roller basket (17) rotates as a loading basket and the belt (15) by means of at least one loading roller (22) on the concentric roll baskets (17, 18) wound pulling. 2. Tape storage machine according to claim 1, characterized in that the roller baskets (17, 18) are designed to be spreadable in a manner known per se. 3. Tape storage machine according to claim 1, characterized in that the center axis of the concentric roller baskets (17, 18) is arranged horizontally in a manner known per se. 4. Tape storage machine according to claim 1, 2 or 3, characterized in that the outer roller cage (17) has an annular base plate (19) which includes the base plate (20) of the inner roller cage (18) in its central opening and on one side which carries with its axes perpendicular to it, arranged on a circular line outer rollers (21). 5. Tape storage machine according to claim 4, characterized in that the base plates (19, 20) of the two roller baskets (17, 18) are aligned. 6. Tape storage machine according to claim 1, characterized in that the loading roller (22) of the outer roller cage (17) has a larger diameter than the rollers (21) intended to support the tape reel (28): 7. Tape storage machine according to claim 1, characterized in that guide the bypass of the belt (15) are arranged on one or both sides of the belt storage device imparting auxiliary rollers (26) outside the outer _R olle basket (17) in alignment with the. 8. Tape storage machine according to claim 7, characterized in that the before the entry of the tape (15) in the roller baskets (17, 18) arranged auxiliary roller (26) is combined with a tape stopper (27). 9. A tape storage machine according to claim 7, characterized in that the side offset guide (25) arranged in the inner roller cage (18) and the auxiliary rollers (26) arranged outside the roller baskets (17, 18) with respect to their surfaces (15) guiding the surfaces in one plane are arranged. 10. _B andspeichermaschine according to claim 9, characterized in that the bypass plane for the belt (15) extends transversely through the upper third of the inner roller basket (18). 11. Tape storage machine according to claim 9, characterized in that in the inner roller cage (18) where the tape (15) enters the inner roller cage, a support and deflection roller (24) is arranged, the effective surface with the bypass plane is aligned and in storage mode deflects the belt (15) when it is pulled from the inner reel (29) to the lateral offset guide (25). . 12. A tape storage machine according to claim 11, characterized in that the loading roller (22) in the bypass operation near the support and deflection roller (24) of the inner roller basket (18) above the belt (15) is arranged ready for storage operation.

Images