Web box and method of operation thereof

Abstract

The present invention relates to a roll cassette for winding metal strip into a roll and for unwinding metal strip from the roll. In order to improve the known roll cassette so that the position of the roll is known at any time, especially during the passive transfer from the winding station to the unwinding station, the present invention proposes to provide at least one additional roller (116) rotatably supported on a frame (114).

Description

Technical Field

[0001] This invention relates to a roll cassette for winding metal strip into a roll and for unwinding the metal strip from the roll. The term "roll" specifically refers to wound metal strip. The invention also relates to a system comprising a roll cassette according to the invention and a roll processed therein. Finally, the invention relates to a method for operating the roll cassette. Background Technology

[0002] Roofing boxes are generally known in the prior art. They typically consist of a winding station and an unwinding station located downstream of the winding station along the material flow direction. Both the winding and unwinding stations consist of multiple adjustable rollers. Inside the roofing box, the roll that has been wound in the winding station must be transferred to the downstream unwinding station. For this transfer of the roll, two basic solutions are known in the prior art: active roll transfer and passive roll transfer.

[0003] To achieve active roll transfer, additional hydraulic actuators are typically required in the area between the winding and unwinding stations. This is not only costly but also requires additional space between the two stations. Furthermore, the startup workload is considerable, as the actuator movement must be precisely coordinated with the rollers of both the previous and subsequent winding stations to ensure smooth roll transfer. Therefore, active roll transfer involves a significant amount of technical equipment work. Examples of active roll transfer are described in European patent documents EP 2 257 395 B1 and EP 2 616 196 B2. The advantage of active roll transfer is that the dwell place or position of the roll within the roll cassette, particularly during the transfer from the winding station to the unwinding station, is always clearly defined. Therefore, in the case of active roll transfer, if it is clearly evident from the current position of the previously wound roll that it has definitively left the winding station or definitively arrived at the unwinding station, the new roll to be wound can already enter the winding station. In this way, high productivity can be achieved using active roll material transfer.

[0004] So-called passive roll transfer, also known in the prior art, does not offer these advantages. However, its implementation cost is much lower because it does not require additional equipment technology. In passive roll transfer, when the roll becomes so light that its weight is no longer sufficient to transfer the torque of the unwinding rollers to the roll to bend the metal strip upwards, the traction force of the finishing mill train downstream of the roll box pulls the roll from the winding station to the unwinding station. When the rotational motion of the roll stops, the unwinding of the roll also stops. Depending on the material, temperature, and geometry of the metal strip, passive roll transfer does not begin until a calculable ring weight is reached. However, it is possible that the roll is not fully pulled to the unwinding station but remains between the rollers of the winding station and the unwinding station for a finite time. This is more pronounced in cases where the material is soft, i.e., at high temperatures and when the metal strip is very thin. Therefore, in passive roll transfer, the position of the roll cannot always be precisely determined; that is, it is particularly unclear whether the roll is still between two stations or already in the unwinding station. However, new metal strip to be wound can only be released into the winding station of the roll cassette after ensuring that the winding station of the roll cassette is completely empty. However, because the position of the roll is unclear in passive roll transfer, especially during the transfer from the winding station to the unwinding station, and the position of the roll cannot be clearly determined until it is in the unwinding station, a time loss occurs in passive roll transfer involving determining when the roll has definitively left the winding station. This is accompanied by a decrease in equipment productivity, because the subsequent metal strip to be wound can only be released into the winding station of the roll cassette when the previously wound roll has definitively left the winding station. Summary of the Invention

[0005] The purpose of this invention is to improve known roll cassettes, known systems consisting of roll cassettes and rolls, and known methods for operating roll cassettes, so that the position of the rolls is known at all times, especially during the passive transfer of the rolls from the winding station to the unwinding station, and thus the exact point in time when the rolls leave the winding station within the roll cassette can be determined with absolute certainty.

[0006] This objective is achieved by a roll cassette according to the invention. The roll cassette comprises: a winding station for winding metal strip into a roll, wherein the winding station is formed by a plurality of rollers, a first roller and a second roller of which are rotatably supported on a common frame; a rotary actuator for pivoting the frame having the first roller and the second roller about a rotation point from a winding position by an angle α in a region near the first roller, in which the metal strip is wound into the roll, and enters a delivery position via a plurality of transition positions through which the wound roll passes, the delivery position for delivering the roll to an unwinding station; and the unwinding station, formed by at least a third roller and a fourth roller, in which the metal strip can be unwound from the roll, wherein the unwinding station is arranged downstream of the winding station in the material flow direction; and wherein, in the material flow direction, the second roller is arranged downstream of the first roller, and the fourth roller is arranged downstream of the third roller, and the rotation axes of all rollers are parallel to each other. The subject matter is characterized by having at least one additional roller rotatably supported on a frame, such that the axis of rotation of the additional roller is parallel to the axes of rotation of the first to fourth rollers, and the axis of rotation of the additional roller is positioned on the frame such that its radial distance xz to the rotation point of the frame is greater than the radial distance x2 from the rotation point of the second roller to the rotation point of the frame, and its radial distance xz plus the radius of the additional roller is less than the minimum radial distance x3 from the rotation point of the third roller to the rotation point of the frame minus the radius of the third roller, and in a first transition position, wherein the uppermost points of the first and second rollers form a horizontal roller table plane, and the uppermost point of the additional roller is arranged at a predetermined distance w below this roller table plane. Thus, the additional roller, and possibly other additional rollers, are at least partially protected from heat radiation emitted by the coil, which is still normally hot. This is meaningful, and may even be necessary, because at this stage there is no additional strip contact that carries away additional heat from the rolled material.

[0007] The advantage of the additional rollers according to the invention is that the position of the roll material during its transfer from the winding station to the unwinding station and the point at which the roll material leaves the winding station can be determined better or more accurately. This results in increased productivity compared to conventional passive transfer, as subsequent winding of the strip can begin earlier. Further explanation is given in the description of the embodiments.

[0008] The transfer of the roll material from the winding station to the unwinding station can be advantageously made easier according to one embodiment by providing at least one shifting device for optionally and separately shifting the third and / or fourth rollers forming the unwinding station to a position below the roller bed plane E1 formed by the first and second rollers in the first transition position.

[0009] According to another embodiment, an additional roller is rotatably supported on the frame between the second roller and the additional roller. This additional roller is positioned on the frame such that its outer circumference lies above a virtual (towards the roller path plane E1) tangential connecting line between the outer circumferences of the second roller and the additional roller. By providing this additional roller, the position of the roll and the point at which it leaves the winding station can be more accurately determined. Furthermore, the additional roller offers the advantage that the roll transfer from the first transition position through the second transition position to the third transition position runs more smoothly kinematically because the additional roller pre-positions the roll before it acts on it.

[0010] Advantageously, the roll cassette according to the invention also has a position detector to generate a position indication of the position of the additional roller, particularly when the additional roller is raised to or above the height of the roller bed plane formed by the first and second rollers in the first transition. Advantageously, the position of the additional roller also represents the position of the roll during roll transfer.

[0011] According to another embodiment, in the delivery position, the second roller has reached its upper end position.

[0012] According to another embodiment, the diameter of the additional roller is smaller than the diameter of the first roller, the second roller, the third roller, or the fourth roller.

[0013] According to another embodiment, at least one shifting device is provided for optionally and individually shifting the third roller and / or the fourth roller to a position below the roller bed plane formed by the first roller and the second roller.

[0014] According to another embodiment, an additional roller is provided, which is also rotatably supported on the frame between the second roller and the additional roller, wherein the additional roller is positioned on the frame such that its outer circumference lies above a virtual, tangential connecting line between the outer circumference of the second roller and the outer circumference of the additional roller, facing the roller conveyor plane.

[0015] According to another embodiment, a position detector is provided to generate a position signal indicating the position of the additional roller, particularly when the additional roller is raised to or above the height of the roller path plane formed by the first roller and the second roller in the first transition position.

[0016] According to another embodiment, a forming area is provided at the beginning of the winding station, the forming area having an inlet roller, a bending roller, and a forming roller, the inlet roller for guiding new metal strip into the roll box, and the bending roller and the forming roller for forming the starting portion of the new metal strip into a roll eye for a new roll to be wound in the winding station.

[0017] According to another embodiment, when the metal strip is wound into a new roll in the winding station, the frame is pivoted to a winding position by means of a rotary drive, in which the first roller and the second roller form an inclined surface toward the forming area.

[0018] The above-mentioned object of the present invention is further achieved by a system according to the invention, comprising a roll cassette according to the invention and a roll wound therein. The additional roller, and if present, and other additional rollers, are further rotatably supported on the frame such that when the frame pivots from the first transition position by an angle αP2 into a second transition position, in the second transition position, the additional roller or the other additional roller first contacts the roll carried by the second roller and the third roller, the horizontal projection distance xz between the axis of rotation of the additional roller or the other additional roller and the point of rotation of the frame. P Or horizontal projection distance xwz P The horizontal projection distance xc between the center of gravity of the roll material and the rotation point of the frame is less than the distance between the roll material and the rotation point of the frame. P .

[0019] As the frame pivots past the third transition position into the delivery position and the roll is supported only by the third roller and the additional roller, the roll descends below the upper edge of the third roller at its lowest point on its outer circumference by a distance not exceeding a predetermined maximum allowable distance.

[0020] Finally, this objective is also achieved by the method according to the invention. The method comprises the following steps:

[0021] The metal strip is wound into a coil in the winding station of the coil box;

[0022] By applying traction force to the initial portion of the metal strip wound into a coil and by pivoting at least the second roller of the winding station to the delivery position via a pivot point around the frame, the wound coil is transferred through multiple transition positions in the winding station to the unwinding station, which is arranged downstream of the coil box along the material flow direction.

[0023] To reach the delivery position, the frame, along with the first and second rollers rotatably supported thereon, and additional rollers, and possibly further additional rollers, pivot about a point of rotation of the frame, such that the additional rollers or the further additional rollers rise above the horizontal roller plane formed by the first and second rollers in the first transition position; and

[0024] The roll material is in a quasi-unstable equilibrium in the delivery position, supported only by the third roller and the additional roller.

[0025] According to another embodiment, a position signal is generated when one of the rollers on the frame, particularly the additional roller, rises above the horizontal roller plane formed by the first roller and the second roller in their starting positions; and in the delivery position, it has reached its corresponding upper end position; and the position signal serves as a confirmation signal that the roll has definitively left the winding station.

[0026] According to another embodiment, new metal strip is not allowed to enter the forming area of ​​the roll box to form a new roll until a confirmation signal is generated.

[0027] According to another embodiment, a traction force is applied to the initial portion of the metal strip wound into a coil and / or the third roller is lowered relative to the roller bed plane to transfer the coil from the delivery position to the unwinding station, in which the coil is stably supported on the third roller and the fourth roller.

[0028] According to another embodiment, the traction force is applied by a rolling mill stand for rolling the metal strip, which is arranged downstream of the unwinding station along the material flow direction.

[0029] The advantages of these two solutions correspond to those mentioned above regarding the reel cassette claimed. Advantageous designs of the reel cassette, system, and claimed method are the subject of the dependent claims. Attached Figure Description

[0030] The instruction manual includes a total of 8 attached diagrams, among which...

[0031] Figure 1 A roll cassette according to the invention is shown, consisting of a winding station and an unwinding station in a first transition position;

[0032] Figure 2 The image shows a roll cassette according to the invention in the second transition position of the winding station;

[0033] Figure 3 The winding station is shown in the third transition position of the roll cassette;

[0034] Figure 4 The image shows a roll cassette according to the invention in the delivery position at the winding station; and

[0035] Figures 5 to 8 Corresponding to Figures 1 to 4 The only difference is that now there is another auxiliary roller rotatably arranged between the second roller and the auxiliary roller in the winding station. Detailed Implementation

[0036] The present invention will now be described in detail with reference to the accompanying drawings by way of embodiments. In all the drawings, the same technical elements are indicated by the same reference numerals.

[0037] Figure 1 A roll cassette 100 according to the invention is shown. It consists of a winding station 110 and an unwinding station 120 for winding metal strip into rolls. The winding station 110 and the unwinding station 120 each consist of a plurality of rollers for transporting the metal strip along the transport direction R. A first roller 111, a second roller 112, and an additional roller 116, as is special according to the invention, are provided in the winding station, all of which are rotatably supported on a common frame 114. The frame 114, which has the rollers, is supported in such a way that it can pivot about a point of rotation D by an angle α. A rotary actuator 125 is provided to pivot the frame 114. The term "rotary actuator" also includes a lifting cylinder that acts translationally, by which rotational or pivotal movement can also be achieved.

[0038] The unwinding station 120 consists of at least one third roller 123 and a fourth roller 124, which can be individually displaced at least in the vertical direction, i.e., in their height. The vertical displacement or height difference can be varied at any time by the displacement device 130, or it can be fixed once by a so-called intermediate plate and then remain in that position, or it can be fixed in a structurally immovable manner. The advantage of the intermediate plate implementation is that fewer adjustment functions are required. When the first roller 111, the second roller 112, the third roller 123, and the fourth roller 124 are horizontally aligned, all four rollers form a horizontal roller bed plane E1 in their basic or initial positions. These rollers are arranged sequentially in the transport direction R. The rotation axes of all rollers, including the additional roller 116, are arranged parallel to each other. The additional roller 116, according to the invention, is arranged on the frame 114 such that its radial distance xz to the rotation point D of the frame 114 is greater than the radial distance x2 from the rotation point D of the second roller 112 to the rotation point D of the frame. Furthermore, the radial distance xz of the additional roller 116 plus the radius of the additional roller is less than the minimum radial distance x3 from the rotation point of the third roller 123 to the rotation point D of the frame 114 minus at least the radius of the third roller 123. In particular, collisions with roller 3 must be structurally eliminated. Finally, in Figure 1 The frame 114 shown is positioned at a transitional location P1 with rollers arranged thereon, where the uppermost points of the first and second rollers form the horizontal roller conveyor plane E1, and the uppermost point of the additional roller 116 is positioned at a predetermined distance w below the roller conveyor plane E1. An additional roller 115, between the second roller 112 and the additional roller 116, is similarly rotatably supported on the frame 114. This additional roller 115 is then positioned on the frame 114 such that its outer circumference lies above a virtual (towards the roller conveyor plane) tangent connecting line V between the outer circumferences of the second roller 112 and the additional roller 116.

[0039] The diameter of the additional roller 116 and the additional roller 115 is smaller than the diameter of the first roller to the fourth roller, for example, 2 / 3 or 1 / 2.

[0040] The roll cassette according to the invention may also include a position detector 140 for generating a position signal indicating the position of the additional roller, particularly when the additional roller 116 rises to the height of the horizontal roller plane E1 formed by the first roller 111 and the second roller 112 in the first transition position P1, or continues to rise. The position sensor 140 may also be configured to acquire the position of the frame 114, wherein the position of the additional roller can be determined by kinematic relationships. In this embodiment, the acquired frame position represents the position of the additional roller.

[0041] At the beginning of the winding station 110, there is typically a forming area with inlet rollers, bending rollers, and forming rollers. The inlet rollers guide new metal strip into the roll cassette, and the bending and forming rollers shape the beginning of the new metal strip into an eye for the roll to be newly wound in the winding station. However, the forming area of ​​the winding station 110 is not the subject of this invention and is therefore not shown in the figures. In the forming area of ​​the winding station, the incoming metal strip is wound into a roll 20 and initially stored on the first roller 111 and the second roller 112 of the winding station 110, wherein the first roller and the second roller are horizontally aligned and form a horizontal roller path plane E1. Within the scope of this invention, this position is referred to as the starting position of the two rollers. For example, by briefly pivoting the frame 114 clockwise, the roll slides from its storage position on the first two rollers 111 and 112 to... Figure 1 The first transition position P1 is shown. In this first transition position P1, the roll 20 is carried only by the second roller 112 of the winding station 110 and the third roller 123 of the unwinding station 120. Once the roll 20 reaches this first transition position P1, the frame 114 pivots back to its starting position, as shown. Figure 1 As shown, as an alternative or additional method to briefly pivoting the frame 114 clockwise and counterclockwise, the coil can also be pulled into the first transition position P1 by applying a traction force to the free end of the coiled metal strip. When the free end of the coiled metal strip is caught in the roll gap of the mill stand, traction can be applied to the free end of the metal strip in the transport direction R, for example, through the mill stand downstream of the coil box. The mill stand is not shown in the figures.

[0042] The purpose of the method for operating a roll cassette according to the present invention is to transfer the roll 20 wound in the roll cassette 100 from the winding station 110 through a plurality of transition positions P1, P2 and P3 and delivery position P4 along the transfer direction R to the unwinding station 120.

[0043] exist Figure 1 In the first delivery position shown, the roll 20 is carried only by the second roller 112 and the third roller 123. In order to transfer the roll 20 to the unwinding station 120, in the first method step, the frame 114 is pivoted counterclockwise by only an angle αP2, such that the additional roller 116 abuts against the outer circumference of the roll 20.

[0044] This means as Figure 2The second transition position P2 is shown. Importantly, in this case, the horizontal projected distance xzp between the axis of rotation of the additional roller 116 and the point of rotation of the frame 114 is less than the horizontal projected distance xcp between the center of gravity of the roll 20 and the axis of rotation D of the frame 114. This relationship between distances xcp and xzp ensures that the roll 20 not only rises during subsequent further pivoting or rotation of the frame 114 counterclockwise, but also further transfers along the transport direction R. Figure 3 In the third transition position shown.

[0045] In this third transition position, the roll material is carried only by the additional roller 116 and the third roller 123. However, the axis of rotation of the additional roller 116 remains below the virtual line connecting point D of the frame 114 and the central axis of the roll material 20. The roll material 20 has only reached its final position when the frame 114 pivots further counterclockwise to a certain extent, causing the axis of rotation of the additional roller 116 to lie on the line connecting the axis of rotation D of the frame and the midpoint of the roll material eye. Figure 4 The delivery position is shown as P4. The roll 20 is now in a quasi-stable equilibrium state because its center of gravity is located exactly above the midpoint of the rotation axis of the third roller 123. At this point, further transfer of the roll 20 to the desired location cannot be achieved by further pivoting of the frame 114. Figure 4 In the target position shown by the dashed line, the coil 20 is stably positioned on the third roller 123 and the fourth roller 124 of the unwinding station 120. Instead, by applying strip traction along the transport direction R to the free end of the coil wound into a metal strip, the coil is moved from an unstable equilibrium state to a stable position on the rollers 123 and 124. In the delivery position P4, the coil 20 is allowed to descend below the upper edge of the third roller 123 at its lowest point on its outer circumference by a distance not exceeding a predetermined maximum allowable distance Amax. This draws the coil 20 into a stable equilibrium position, as... Figure 4 As shown by the dashed line, this is a prerequisite that can only be achieved through strip traction. To facilitate the transition of the coil 20 from delivery position P4 to stable support on the third roller 123 and the fourth roller 124, the fourth roller 124 can be lowered relative to the horizontal plane E1, as shown... Figure 4 As shown.

[0046] Figures 5 to 8 A second embodiment according to the present invention is shown, wherein, in addition to the additional roller 116, a further additional roller 115 is rotatably supported on the frame 114. The precise positioning of the further additional roller 115 on the frame has been described above. Figures 1 to 4 similar, Figures 5 to 8 The diagrams show the different transition locations P1, P2, and P3 that the roll 20 must pass through before reaching the delivery location P4. Figure 8The delivery position P4 is shown for the second embodiment. The transition positions P1, P2, P3, and delivery position P4 are achieved, in particular, by a further counter-clockwise pivoting of frame 114. In delivery position P4, in particular the second roller 112, the additional rollers 115 and 116 also reach their respective upper ends. The second roller 112 is designated Top2. This applies both to the first embodiment without additional rollers and to the second embodiment with additional rollers.

[0047] According to Figure 5 As can be seen in the first transition position P1, the roll 20 is initially carried only by the second roller 112 and the third roller 123. Additional rollers 115 and 116 remain below the roll 20, not in contact with it. Only by pivoting counterclockwise the frame 114, on which the rollers are arranged, can the roll 20 be supported. Figure 6 When transitioning from the first transition position to the second transition position, the additional rollers 115, besides the second and third rollers, abut against the outer circumference of the roll 20. It is also important here that similar... Figure 2 The description states that the horizontal projected distance xcp between the midpoint of the roll 20 and the rotation axis D of the frame 114 is greater than the horizontal projected distance xwzp between the rotation axis of the additional rollers forming the abutment and the rotation point D of the frame 114. The rationale for this distance standard is... Figure 2 The same reasoning in the description is that when frame 114 pivots further, roll 20 must not only be lifted, but also subjected to a component force in the direction of transfer R.

[0048] As the frame 114 further pivots counterclockwise from the second transition position P2 to the third transition position P3, the roll 20 separates from the second roller 112, and alternatively, the additional roller 116 further abuts against the roll 20. The roll 20 is now supported by additional rollers 115, 116, and a third roller 123; see also... Figure 7 .

[0049] By further pivoting frame 114 counterclockwise about axis of rotation D, roll 20 is further compressed or moved along transport direction R, and thus reaches delivery position P4; see also Figure 8In delivery position P4, the roll 20 has been separated from the additional auxiliary roller 115 and is now placed only on the auxiliary roller 116 and the third roller 123. In this delivery position, the roll 20 is in an unstable equilibrium state. All rollers on frame 114 have reached their upper end positions; this upper end position is also identified here by reference numeral Top2 for the second roller 112. In delivery position P4, the auxiliary roller 116 is located at its midpoint on the virtual connecting line between the rotation point D of frame 114 and the center of the roll 20. Ideally, if position TOP2 is permitted, it may be limited by the upper end position. In this embodiment, the roll 20 can also be transferred from an unstable equilibrium position to a stable equilibrium position by traction along the transfer direction R on the free end of the strip and / or by lowering the third roller 123 below plane E1, wherein the roll is then placed on the third roller 123 and the fourth roller 124 of the unwinding station 120. The movement of the third roller 123 and the fourth roller 124, especially in the vertical direction, can be achieved by a shifting device 130 acting on the rollers or by other means, as described above in the section on... Figure 1 As explained in the description. The lowering of the fourth roller 124 may also reduce the fixed amount, on the one hand facilitating the storage of the coil in the unwinding station, and on the other hand facilitating the transfer of the unwound metal strip to subsequent processing equipment, such as the rolling mill stand.

[0050] For both embodiments, a position detector can be configured to generate a position signal indicating that at least one of the rollers 111, 112, 115, 116, rotatably supported on frame 114, has reached delivery position P4 and thus its corresponding upper end position Top2. According to the invention, this position signal serves as a confirmation signal that the roll has definitively left the winding station. According to the invention, new metal strip is only allowed to enter the forming area of ​​the roll cassette 100 to form a new roll in response to this confirmation signal. By configuring the additional roller 116 according to the invention, and possibly additional rollers 115, the generally passive roll transfer underlying the invention is enhanced, such that the position of the roll can now be reliably detected at any time during the transition between winding station 110 and unwinding station 120, particularly by detecting the position of the additional rollers 116 and / or additional rollers 115. An additional objective is to increase the productivity of the roll cassette for purely passive roll transfer without additional active adjustment mechanisms.

[0051] List of reference numerals

[0052] 100 rolls of material

[0053] 110 winding station

[0054] 111 First Roller

[0055] 112 Second Roller

[0056] 114 Framework

[0057] 115 Additional rollers

[0058] 116 Additional Rollers

[0059] 120 Rewind Station

[0060] 123 Third Roller

[0061] 124 Fourth Roller

[0062] 125 Rotary Drive

[0063] 130 Displacement Device

[0064] 140 Position Detector

[0065] 20 rolls

[0066] α Frame rotation angle

[0067] The rotation angle of frame αP2 at position P2.

[0068] A max Maximum distance

[0069] D Rotation point

[0070] E1 Horizontal Roller Conveyor Plane

[0071] P1 First Transition Position

[0072] P2 Second Transition Position

[0073] P3 Third transition position

[0074] P4 Delivery Location

[0075] R Material flow direction = Roll material transfer direction

[0076] TOP2 The highest position of the second roller

[0077] V Virtual connection cable

[0078] w Pre-determined distance

[0079] r2 is the radius of roller 116.

[0080] The radius of roller 123 (r3)

[0081] xcp projection distance

[0082] xzp projection distance

[0083] x2 radial distance

[0084] x3 radial distance

[0085] xz radial distance.

Claims

1. Roll material box (100), with the following features: A winding station (110) is used to wind metal strip into a coil (20), wherein... The winding station is formed by a plurality of rollers, wherein the first roller (111) and the second roller (112) are rotatably supported on a common frame (114); A rotary actuator (125) for pivoting a frame (114) having the first roller and the second roller about a rotation point (D) between winding positions in the region of the first roller (111) by an angle α, in which the metal strip is wound into the coil (20), and through a plurality of transition positions (P1, P2, P3) through which the wound coil passes to a delivery position (P4) for delivering the coil (20) to the unwinding station (120); and The unwinding station (120) is formed by at least one third roller (123) and a fourth roller (124), in which the metal strip can be unwound from the coil (20). Along the material flow direction (R), the unwinding station (120) is located downstream of the winding station (110); and Along the material flow direction (R), the second roller (112) is arranged downstream of the first roller (111), and the fourth roller (124) is arranged downstream of the third roller (123), and the rotation axes of all rollers are parallel to each other. Its features are, At least one additional roller (116) is provided that is rotatably supported on the frame (114). The rotation axis of the additional roller is parallel to the rotation axes of the first roller to the fourth roller; and The axis of rotation of the additional roller (116) is positioned on the frame (114) such that... - The radial distance xz from the rotation axis to the rotation point (D) of the frame (114) is greater than the radial distance x2 from the rotation point of the second roller to the rotation point of the frame; - The radial distance xz from the axis of rotation to the rotation point (D) of the frame (114) plus the radius of the additional roller (116) is less than the minimum radial distance x3 from the rotation point of the third roller (123) to the rotation point (D) of the frame (114) minus the radius of the third roller; and - In the first transition position (P1), the uppermost points of the first roller and the second roller form a horizontal roller bed plane (E1), and the uppermost point of the additional roller is arranged at a predetermined distance w below the roller bed plane (E1).

2. The roll material box (100) according to claim 1. Its features are, At the delivery position (P4), the second roller (112) has reached its upper end position (TOP2).

3. The roll box (100) according to any one of the preceding claims. Its features are, The diameter of the additional roller (116) is smaller than the diameter of the first roller, the second roller, the third roller, or the fourth roller.

4. The roll box (100) according to claim 1 or 2. Its features are, At least one shifting device (130) is provided for optionally and individually shifting the third roller (123) and / or the fourth roller (124) to a position below the roller plane (E1) formed by the first roller (111) and the second roller (112).

5. The roll cassette (100) according to claim 1 or 2. Its features are, An additional roller (115) is provided, which is also rotatably supported on the frame between the second roller (112) and the additional roller (116), wherein the additional roller is positioned on the frame (114) such that its outer circumference is located above a virtual, tangent connecting line (V) between the outer circumference of the second roller (112) and the outer circumference of the additional roller (116) and toward the roller table plane (E1).

6. The roll cassette (100) according to claim 1 or 2. Its features are, A position detector (140) is provided to generate a position signal indicating the position of the additional roller (116).

7. The roll cassette (100) according to claim 6. Its features are, When the additional roller rises to or exceeds the height of the roller plane (E1) formed by the first roller (111) and the second roller (112) in the first transition position (P1), the position detector (140) generates a position signal indicating the position of the additional roller (116).

8. The roll cassette (100) according to claim 1 or 2. Its features are, A forming area is provided at the beginning of the winding station (110), the forming area having an inlet roller, a bending roller and a forming roller, the inlet roller for guiding new metal strip into the roll box, and the bending roller and the forming roller for forming the starting portion of the new metal strip into a roll eye for a new roll to be wound in the winding station.

9. The roll cassette (100) according to claim 8. Its features are, When the metal strip is wound into a new roll in the winding station, the frame (114) is pivoted to the winding position by means of a rotary driver (125), in which the first roller and the second roller form an inclined plane toward the forming area.

10. A system having a roll cassette (100) and a roll (20) according to any one of the preceding claims, Its features are, The additional roller (116) is further rotatably supported on the frame (114) such that when the frame pivots from the first transition position (P1) by an angle αP2 into the second transition position (P2), in the second transition position, the additional roller (116) first contacts the roll material (20) carried by the second roller (112) and the third roller (123), and the horizontal projection distance xz between the axis of rotation of the additional roller (116) and the rotation point of the frame (114) is... P The horizontal projection distance xc between the center of gravity of the roll material and the rotation point (D) of the frame (114) is less than the distance between the center of gravity of the roll material and the rotation point (D) of the frame (114). P .

11. The system according to claim 10, Its features are, An additional roller (115) is provided, rotatably supported on the frame between the second roller (112) and the additional roller (116). The additional roller (116) and the additional roller (115) are further rotatably supported on the frame (114) such that when the frame pivots from the first transition position (P1) by an angle αP2 into the second transition position (P2), the additional roller (115) first contacts the roll material (20) carried by the second roller (112) and the third roller (123) in the second transition position. The horizontal projection distance xwz between the axis of rotation of the additional roller (115) and the point of rotation of the frame (114) is... P The horizontal projection distance xc between the center of gravity of the roll material and the rotation point (D) of the frame (114) is less than the distance between the center of gravity of the roll material and the rotation point (D) of the frame (114). P .

12. The system according to claim 10 or 11, Its features are, - When the frame pivots past the third transition position (P3) into the delivery position (P4) and the roll (20) is supported only by the third roller (123) and the additional roller (116), the roll (20) descends to below the upper edge of the third roller (123) at its lowest point on its outer circumference by a distance not exceeding the predetermined maximum allowable distance (Amax).

13. A method for operating a roll cassette (100) according to any one of the preceding claims, the method comprising the following steps: The metal strip is wound into a coil (20) in the winding station of the coil box. By applying traction to the initial portion of the metal strip wound into a coil and by lifting at least the second roller (112) of the winding station to the delivery position (P4) via a pivot point (D) around the frame, the wound coil (20) is transferred through multiple transition positions (P1, P2, P3) in the winding station (110) to the unwinding station (120) arranged downstream in the material flow direction (R) of the coil box (100). Its features are, To reach the delivery position (P4), the frame, along with the first and second rollers rotatably supported thereon and an additional roller (116), pivots about a rotation point (D) of the frame, such that the additional roller (116) rises above the horizontal roller plane (E1) formed by the first roller (111) and the second roller (112) in the first transition position (P1); and The roll (20) is in a quasi-unstable equilibrium in the delivery position (P4) supported only by the third roller (123) and the additional roller (116).

14. The method according to claim 13, Its features are, An additional roller (115) is provided, which is also rotatably supported on the frame between the second roller (112) and the additional roller (116). In order to reach the delivery position (P4), the frame, the first and second rollers rotatably supported thereon, the additional roller (116), and the additional roller (115) pivot about a rotation point (D) of the frame, such that the additional roller (115) rises above the horizontal roller plane (E1) formed by the first roller (111) and the second roller (112) in the first transition position (P1).

15. The method according to claim 13 or 14, Its features are, A position signal is generated when one of the rollers on the frame (114) rises above the horizontal roller plane (E1) formed by the first roller (111) and the second roller (112) in their starting positions; and in the delivery position (P4), it has reached its corresponding upper end position (TOP2); and The position signal serves as a confirmation signal that the roll (20) has definitively left the winding station (110).

16. The method according to claim 15, Its features are, A position signal is generated when the additional roller (116) rises above the horizontal roller plane (E1) formed by the first roller (111) and the second roller (112) in their initial positions.

17. The method according to claim 15, Its features are, New metal strip is not allowed to enter the forming area of ​​the roll box (100) to form a new roll until a confirmation signal is generated.

18. The method according to claim 13 or 14, Its features are, A traction force is applied to the initial portion of the metal strip wound into a coil (20) and / or the third roller (123) is lowered relative to the roller bed plane (E1) to transfer the coil from the delivery position (P4) to the unwinding station (120), in which the coil is stably supported on the third roller (123) and the fourth roller (124).

19. The method according to claim 18, Its features , The traction force is applied by a rolling mill stand for rolling the metal strip, which is arranged downstream of the unwinding station (120) along the material flow direction.

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