Coil box and method for operating said coil box

Abstract

The present invention relates to a coil box for winding a metal strip onto a coil and for unwinding said metal strip from said coil. In order to improve the known coil box in such a way that the position of the coil is always known, in particular during the passive transport of the coil from the winding station to the unwinding station, the invention proposes that at least one additional roller 116 is provided, rotatably supported in said frame 114.

Description

[Technical field]

[0001] The present invention relates to a coil box for winding a metal strip onto a coil and for unwinding said metal strip from this coil. The term "coil" means in particular a wound metal strip. The invention further relates to a coil box according to the invention as well as to a system consisting of a coil which is processed in this coil box. Finally, the invention relates to a method for the operation of the coil box. [Background technology]

[0002] Coil boxes are basically known in the prior art and typically consist of a winding station and an unwinding station arranged downstream of the winding station in the direction of material flow, each of which consists of a number of position-adjustable rollers. Inside this coil box, the completed coil wound in the winding station needs to be transferred into a subsequently arranged unwinding station. For this coil transfer, two basic solutions are known in the prior art: active coil transfer and passive coil transfer.

[0003] To realize active coil transport, additional position adjustment drives, typically hydraulic, are required in the area between the winding and unwinding stations, which are not only expensive but also require additional space between the winding and unwinding stations. In addition, this leads to a very complex start-up process, since the movements of these position adjustment drives must be coordinated very precisely with the rollers of the preceding winding and subsequent unwinding stations for friction-free coil transport. The technical capital expenditure is therefore very high in the case of active coil transport. Examples for active coil transport can be found in US Pat. No. 5,399,623 and US Pat. No. 5,499,633. The advantage of active coil transport is that the location or position of the coil inside the coil box, and in particular also during transport from the winding station to the unwinding station, is always clearly defined. During active coil transport, therefore, when it is clear based on the current position of the last wound coil that this coil has reliably left the winding station or has reliably reached the unwinding station, a new strip to be wound can also be run into the winding station.

[0004] Likewise, the so-called passive coil transfer known in the prior art does not offer this advantage, which in contrast can be realized at a much lower cost, since it does not require any additional installation technology. In passive coil transport, when the weight of the coil is so light that it is no longer sufficient to transmit the rotational torque of the unwinding rollers to it in order to bend the metal strip open, the coil is pulled from the winding station into the unwinding station by the pulling force of the finishing rolling line arranged downstream of the coil box. When the rotational movement of the coil stops, the unwinding of the coil is terminated. Passive coil transport always starts first of all with a calculable ring weight, depending on the material, temperature and geometry of the metal strip. However, it can happen that the coil is not pulled completely to the unwinding station, but rather remains in a time-limited state between the rollers of the winding station and the unwinding station. This happens more with soft materials, i.e. at high temperatures and low thicknesses of the metal strip. The position of the coil is therefore not always precisely determinable in the case of passive coil transport; and in particular it remains unclear whether the coil is still located between both stations or is already located in the unwinding station. A metal strip to be newly wound can, however, only be released into the coil box winding station if it is ensured that the coil box winding station has been completely emptied. In the case of passive coil transport, however, since the position of the coil is unclear, in particular during the transport of the coil from the winding station into the unwinding station, and since the position of the coil can first of all be determined unambiguously in the unwinding station, this passive coil transport results in a loss of time in determining when the coil has finally left the winding station. This results in a reduced productivity of the installation, since the metal strip to be wound next can only be released for entry into the winding station of the coil box when the previously wound coil has finally left the winding station. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] European Patent Specification No. 2 257 395 B1 [Patent Document 2] European Patent No. 2 616 196B2 Summary of the Invention [Problem to be solved by the invention]

[0006] The object of the present invention is to provide a method for the operation of a known coil box, a system consisting of said coil box and a coil, the position of the coil is always known, in particular during the passive transfer of the coil from the winding station to the unwinding station, and therefore the time when the coil leaves the winding station in the coil box can also be finally determined; The purpose of the present invention is to improve the above-mentioned system. [Means for solving the problem]

[0007] This problem is solved by the subject matter of claim 1 with regard to the coil box. This subject is: providing at least one additional roller rotatably supported on the frame; The rotation axis of the additional roller is parallel to the rotation axes of the first roller to the fourth roller; and The rotation axis of the additional roller is the radial spacing xz of the axis of rotation of the additional roller relative to the point of rotation of the frame is greater than the radial spacing x2 of the point of rotation of the second roller relative to the point of rotation of the frame; a value obtained by adding the radius of the additional roller to the radial interval xz of the rotation axis of the additional roller is smaller than a value obtained by subtracting the radius of the third roller from the minimum radial interval x3 of the rotation point of the third roller relative to the rotation point of the frame, and, the uppermost point of the additional roller is located below the horizontal roller table plane by a predetermined distance w at a first transition position where the uppermost points of the first roller and the second roller form this horizontal roller table plane; being positioned in the frame so as to It is characterized by: This protects the additional roller, and possibly also further additional rollers, at least to some extent from the heat radiation emitted by the coil, which is usually still hot, which is meaningful and possibly even necessary, since in this aspect there is likewise no additional strip contact which would take additional heat away from the rolled material. Effect of the Invention

[0008] The additional roller according to the invention provides the advantage that the position of the coil during its transport from the winding station into the unwinding station and the moment when the coil leaves the winding station can be better or more accurately determined. This has the advantage that the production rate can be increased compared to a classical passive transport, since the winding start of the subsequent strip can start earlier, as will be explained in more detail in the description of the embodiment.

[0009] The transfer of the coil from the winding station to the unwinding station, according to one embodiment, advantageously comprises: at least one moving device is provided for selective and individual movement of the third roller and / or the fourth roller forming an unwinding station to below the roller table plane E1 formed by the first roller and the second roller in a first transition position, This is facilitated by

[0010] According to yet another embodiment, a further additional roller is rotationally supported in the frame between the second roller and the additional roller. Another additional roller is so that this further additional roller projects with its outer periphery beyond an imaginary tangential joining line - directed towards the roller table plane E1 - between the outer periphery of the second roller and the outer periphery of the further additional roller, It is positioned in the frame. By means of this further additional roller arrangement, the position of the coil and the time of departure of the winding station can be determined even better. In addition, the further additional roller provides the advantage that the transport of the coil from the first transition position through the second transition position to the third transition position proceeds kinematically smoother, since the further additional roller pre-positions the coil before it is gripped by the further additional roller.

[0011] Advantageously, the coil box according to the invention further comprises a position detector for generating a position indication, which represents the position of the additional roller, in particular when the additional roller is raised to or above the height of the roller table plane formed by the first roller and the second roller in the first transition position. Advantageously, the position of the additional roller is in turn indicative of the position of the coil throughout the coil transport.

[0012] The above-stated object of the present invention is further solved by a system according to claim 9, which system comprises a coil box according to the present invention and a coil wound in said coil box. In conclusion, the object is further solved by a method according to claim 11. The advantages of both these solutions correspond to the advantages stated for the claimed coil box. Advantageous embodiments of the coil box, the system as well as the claimed directions are the subject of the dependent claims.

[0013] A total of eight figures are attached to this specification. [Brief description of the drawings]

[0014] [Figure 1] FIG. 2 is a view of a coil box according to the invention, consisting of a winding station and an unwinding station, in a first transition position. [Diagram 2] FIG. 2 is a diagram of a coil box according to the present invention having a winding station in a second transition position. [Diagram 3] FIG. 13 is a view of the coil box with the winding station in a third transition position. [Figure 4] FIG. 2 shows a coil box according to the invention with a winding station in a transfer position. [Diagram 5] 1 with the only difference that a further additional roller is rotatably arranged between the second roller of the winding station and the additional roller. [Figure 6] 3 corresponds to FIG. 2 with the only difference that a further additional roller is rotatably arranged between the second roller of the winding station and the additional roller. [Figure 7] 3, with the only difference that a further additional roller is rotatably arranged between the second roller of the winding station and the additional roller. [Figure 8] 5 corresponds to FIG. 4 with the only difference that here another additional roller is rotatably arranged between the second roller of the winding station and the additional roller. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The invention will now be described in detail by way of example with reference to the figures mentioned above, in which like technical elements are designated with like reference numerals, in which:

[0016] 1 shows a coil box 100 according to the invention, which consists of a winding station 110 for winding a metal strip into a coil, and an unwinding station 120. The winding station 110 and the unwinding station 120 each consist of a number of rollers on their sides for transporting the metal strip in the transport direction R. In the winding station a first roller 111, a second roller 112 and, as a feature according to the invention, an additional roller 116 are provided, all of which are rotatably mounted in a common frame 114. The frame 114 with the rollers mentioned above is supported so as to be pivotable around a rotation point D by a rotation angle α. For the pivoting of the frame 114, a rotary drive 125 is provided. The term "rotary drive" likewise includes translationally acting reciprocating cylinders, by means of which likewise a rotational or pivoting movement can be realized.

[0017] The unwinding station 120 consists of at least a third roller 123 and a fourth roller 124, which can be individually movable at least in the vertical direction, i.e. in the height of the rollers. This vertical movement or height difference can be constantly variably effected by the movement device 130 or can be reliably adjusted once and for all by a so-called intermediate plate and then remain invariably in this position or can be structurally immovably adjusted. The embodiment with an intermediate plate offers the advantage that fewer position 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 table plane E1 in their basic or starting position. The rollers are arranged one behind the other in the transport direction R. The rotation axes of all rollers, including the additional roller 116, are arranged parallel to one another. The additional roller 116 provided according to the invention is arranged in the frame 114 in such a way that the radial distance xz of this additional roller to the rotation point D of the frame 114 is greater than the radial distance x2 of the rotation point of the second roller 112 to the rotation point D of the frame 114. Furthermore, the radial spacing xz of the additional roller 116 plus the radius of this additional roller is less than the minimum radial spacing x3 of the rotation point of the third roller 123 relative to the rotation point D of the frame 114 minus at least the radius of the third roller 123. In particular, collision with roller 3 must be / is structurally precluded. In short, the uppermost point of the additional roller 116 is located below this roller table plane E1 at a predetermined distance w in the first transition position P1, where the uppermost points of the first roller and the second roller of the frame 114 and the rollers arranged on this frame, as shown in FIG. 1, form the horizontal roller table plane E1 mentioned above. Between the second roller 112 and the additional roller 116 , a further additional roller 115 can be likewise supported in the frame 114 . The further additional roller 115 is then positioned in the frame 114 such that it projects with its outer periphery beyond an imaginary tangential joining line V - oriented towards the roller table plane - between the outer periphery of the second roller 112 and the outer periphery of the additional roller 116.

[0018] 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 the size.

[0019] Furthermore, it is possible for the coil box according to the invention to have a position detector 140 for generating a position signal, which indicates the position of the additional roller, This is particularly true when the additional roller 116 is raised to or above the height of the horizontal roller table plane E1 formed by the first roller 111 and the second roller 112 at the first transition position P1. It is also possible that the position detector 140 is configured to detect the position of the frame 114, the position of the additional roller being then determinable by means of the kinematic relationship. In this embodiment, the detected position of the frame represents the position of the additional roller.

[0020] At the start of the winding station 110, a forming area is typically provided, which has an inlet roller for guiding the new metal strip into the coil box and a bending roller and a forming roller for forming the start of this new metal strip into a coil eye for the coil to be newly wound in this winding station. This forming area of ​​the winding station 110 is, however, not the subject of the present invention and is therefore likewise not shown in the figures. In the forming area of ​​the winding station, the incoming metal strip is wound into a coil 20 and is first of all placed on the first roller 111 and the second roller 112 of the winding station 110, the first roller 111 and the second roller 112 being horizontally aligned and forming a horizontal roller table plane E1. Within the scope of the present invention, this position is referred to as the starting position for both rollers. By momentary pivoting of the frame 114, for example in the clockwise direction, the coil 20 is induced to slide from its initial resting position on both rollers 111 and 112 to a first transition position P1 shown in Fig. 1. In this first transition position P1, the coil 20 is carried exclusively by the second roller 112 of the winding station 110 and the third roller 123 of the unwinding station 120. As soon as the coil 20 reaches this first transition position P1, then the frame 114 is again pivoted to its starting position, as shown in Fig. 1. Alternatively or additionally to the temporary pivoting of the frame 114 in the clockwise and counterclockwise direction, the coil can also be pulled to the first transfer position P1 by application of a tension force to the free end of the metal strip wound into the coil. If this free end of the metal strip wound into the coil is clamped into the roll nip of a rolling stand, the tension force to this free end of the metal strip in the transport direction R can be applied, for example, by a rolling stand downstream of the coil box. This rolling stand is not shown in the attached figures.

[0021] The method according to the invention for operating a coil box has the purpose of transporting the coil 20 wound inside the coil box 100 from the winding station 110 through a number of transition positions P1, P2 and P3 and a transfer position P4 in the transport direction R into the unwinding station 120.

[0022] 1, the coil 20 is carried exclusively by the second roller 112 and the third roller 123. For the transfer of the coil 20 into the unwinding station 120, in a first method step the frame 114 is pivoted counterclockwise by an angle αP2 so that the additional roller 116 only abuts against the outer periphery of the coil 20.

[0023] This is indicated by the second transition position P2, as shown in Figure 2. In this situation, it is important that the horizontally projected distance xzp between the axis of rotation of the additional roller 116 and the point of rotation of the frame 114 is smaller than the horizontally projected distance xcp between the center of gravity of the coil 20 and the axis of rotation D of the frame 114. The above-described relationship between the spacings xcp and xzp ensures that the coil 20 is not only raised upon subsequent pivoting or rotation of the frame 114 in the counterclockwise direction, but is also subsequently transported in the transport direction R to the third transition position P3 shown in FIG. 3.

[0024] In this third transition position, the coil is carried only by the additional roller 116 and the third roller 123. The axis of rotation of the additional roller 116, however, still lies below the imaginary join line between point D of the frame 114 and the central axis of the coil 20. Only when the frame 114 has been subsequently pivoted counterclockwise for one further section, and thus the axis of rotation of the additional roller 116 lies on the joining line between the axis of rotation D of the frame 114 and the centre point of the coil eye, does the coil 20 reach the transfer position P4 shown in Fig. 4. The coil 20 is now in an approximately stable equilibrium state, since its centre of gravity lies precisely above the centre point of the axis of rotation of the third roller 123. 4, in which the coil 20 stably rests on the third roller 123 and the fourth roller 124 of the unwinding station 120, can now no longer be achieved by subsequent pivoting of the frame 114. Instead, the coil is moved from an unstable equilibrium state into a stable bearing on the rollers 123 and 124 by application of a strip tension to the free end of the coil wound onto the metal strip in the transport direction R. At the transfer position P4, the coil 20, with its lowest point on the outer circumference, should be lowered below the upper edge of the third roller 123 by less than the predefined maximum permissible distance Amax. This is a prerequisite for the above-mentioned pulling of the coil 20 to a stable equilibrium position, as shown by the dashed line in FIG. 4, to be realizable exclusively by the strip tension. In order to facilitate the transfer of the coil 20 from the transfer position P4 into a stable rest on the third roller 123 and the fourth roller 124, it is possible for this fourth roller 124 to be lowered relative to the horizontal roller table plane E1, as shown in FIG. 4.

[0025] 5 to 8 show a second embodiment according to the invention, in which, in addition to the additional roller 116, a further additional roller 115 is rotatably mounted in the frame 114. The precise positioning of this further additional roller 115 in the frame has already been explained above. Figures 5 to 8, similar to Figures 1 to 4, respectively show different transition positions P1, P2 and P3 through which the coil 20 must pass before it reaches the transfer position P4 illustrated for the second embodiment in Figure 8. The transition positions P1, P2 and P3 as well as the transfer position P4 are reached in particular by the frame 114 being pivoted increasingly and successively counterclockwise. At the transfer position P4, the second roller 112, but also the further additional roller 115 and the further additional roller 116, reach their respective upper end points. For the second roller 112, this upper end point is marked with Top2. This is as true for the second embodiment with the further additional roller as it is for the first embodiment without the further additional roller.

[0026] 5, it can be seen that the coil 20 is carried first of all exclusively by the second roller 112 and the third roller 123. An additional roller 116 as well as a further additional roller 115 are arranged below the coil 20 without yet coming into contact with the coil. Only upon transition from the first transition position P1 to the second transition position P2 according to FIG. 6 by pivoting the frame 114 with the rollers arranged on said frame in the counterclockwise direction does, in addition to the second and third rollers, also another additional roller 115 come into contact with the outer circumference of the coil 20. Analogous to the description of Fig. 2, it is likewise important here that the horizontally projected distance xcp between the centre point of the coil 20 and the axis of rotation D of the frame 114 is greater than the horizontally projected distance xwzp between the axis of rotation of another additional roller brought into abutment and the point of rotation D of the frame 114. The reason for this distance criterion is the same as that explained in the description of Fig. 2, i.e. on subsequent pivoting of the frame 114, not only does the coil 20 have to be lifted, but it must also be subjected to a force component in the transport direction R.

[0027] Subsequent pivoting of the frame 114 counterclockwise to transition from the second transition position P2 to the third transition position P3 results in removal of the coil 20 from the second roller 112 and, instead, in further abutment of the additional roller 116 with said coil 20. Coil 20 is now supported by another additional roller 115, an additional roller 116, as well as a third roller 123; see FIG.

[0028] By further pivoting of the frame 114 counterclockwise about the axis of rotation D, the coil 20 is further pushed or moved in the transport direction R, thus reaching the transfer position P4; see FIG. At this transfer position P4, the coil 20 has disengaged from the further additional roller 115 and now rests only on the additional roller 116 and the third roller 123. At this transfer position P4, the coil 20 is in an unstable equilibrium situation. All rollers in the frame 114 reach, respectively, their upper end position; and this end position, as for the second roller 112, is likewise marked here with the reference Top2. In the transfer position P4, the additional roller 116, with its centre point, is located on the imaginary joining line between the point of rotation D of this frame 114 and the centre of the coil 20. If in the ideal case this allows a position Top2, then possibly it is limited by the upper end position. The coil 20 can also in this embodiment be brought from the unstable equilibrium state to a stable equilibrium state by pulling the free strip end in the transport direction R and / or by lowering the third roller 123 below the roller table plane E1, whereby the coil 20 then rests 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, in particular in the vertical direction, can be realized by a movement device 130 acting on these rollers, as explained above within the scope of the description of Fig. 1, or in other ways. Possibly, the lowering of the fourth roller 124 by an equally constant amount facilitates, on the one hand, the placement of the coil 20 in the unwinding station 120 and, on the other hand, the transfer of the unwound metal strip into a subsequent processing device, for example a rolling stand.

[0029] For both embodiments, it is advantageous that a position detector can be provided for generating a position signal which signals that at least one of the rollers 111, 112, 115, 116 rotatably supported in the frame 114 has reached the transfer position P4 and, therefore, its respective upper end position Top2. According to the invention, this position signal is used as a confirmation signal that the coil has been securely removed from the winding station, and according to the invention, only in response to the confirmation signal thus generated is a new metal strip allowed to enter the forming area of ​​the coil box 100 for forming a new coil. By the arrangement according to the invention of the additional roller 116 and, optionally, of the further additional roller 115, the essentially passive coil transport, the coil transport of which is the basis of the invention, With the aim of increasing the productivity of coil boxes with a purely passive coil movement without active actuators, it is now possible, by the arrangement according to the invention of the additional rollers, in particular by detection of the position of the additional roller 116 and / or the further additional roller 115, to always reliably detect the position of the coil during the transition between the winding station 110 and the unwinding station 120; It will be strengthened with this purpose in mind. In addition, the present application relates to the invention described in the claims, but may also include the following as other aspects. 1. A coil box (100), This coil box is a winding station (110) for winding the metal strip into a coil (20), the winding station being formed of a plurality of rollers, a first roller (111) and a second roller (112) of which are rotatably supported in a common frame (114); from a winding position where the metal strip is wound onto the coil (20), through a number of transition positions (P1, P2, P3) through which the finished wound coil passes, to a delivery position (P4) for delivery of the coil to an unwinding station (120); a rotation drive (125) for pivoting the frame (114) with the first roller and the second roller by a rotation angle α about a rotation point (D) in the area of ​​the first roller (111); and, an unwinding station (120) 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); the unwinding station (120) is arranged following the winding station (110) in the material flow direction (R); and the second roller (112) is arranged following the first roller (111) and the fourth roller (124) is arranged following the third roller (123) in the material flow direction (R), and the rotation axes of all the rollers are aligned parallel to each other; In the coil box, at least one additional roller (116) rotatably supported in said frame (114); the rotation axis of the additional roller is parallel to the rotation axis of the first roller to the fourth roller; and The rotation axis of the additional roller (116) is the radial distance xz of the axis of rotation of the additional roller from the point of rotation (D) of the frame (114) is greater than the radial distance x2 of the point of rotation of the second roller from the point of rotation of the frame, - the radial spacing xz of the rotation axes of the additional roller (116) plus the radius of this additional roller (116) is smaller than the minimum radial spacing x3 of the rotation point of the third roller (123) relative to the rotation point (D) of the frame (114) minus at least the radius of the third roller, and - the uppermost point of said additional roller is In a first transition position (P1), the uppermost points of the first roller and the second roller form a horizontal roller table plane (E1), and are located below this roller table plane (E1) by a predetermined distance w. being positioned in the frame (114) so ​​as to A coil box (100) comprising: 2. The coil box (100) according to claim 1, wherein, at the transfer position (P4), the second roller (112) reaches its upper end position (Top2). 3. The coil box (100) described in 1 or 2 above, wherein 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 coil box (100) according to any one of claims 1 to 3, characterized in that at least one moving device (130) is provided for selective individual movement of the third roller (123) and / or the fourth roller (124) below the roller table plane (E1) formed by the first roller (111) and the second roller (112). 5. Between the second roller (112) and the additional roller (116), another additional roller (115) is provided which is also rotatably supported in the frame; so that this further additional roller projects with its outer periphery beyond an imaginary tangential joining line (V) - directed towards the roller table plane (E1) - between the outer periphery of the second roller (112) and the outer periphery of the additional roller (116), 5. The coil box (100) according to any one of claims 1 to 4, wherein the additional roller is positioned in the frame (114). 6. A position detector (140) is provided for generating a position signal, which indicates the position of the additional roller by: A coil box (100) according to any one of claims 1 to 5, characterized in that, in particular, this additional roller is raised to or above the height of the roller table plane (E1) formed by the first roller (111) and the second roller (112) in the first transition position (P1). 7. It has an inlet roller for guiding the new metal strip into the coil box and a bending roller and a forming roller for forming the start of this new metal strip into a coil eye for a coil to be newly wound in the winding station, 7. The coil box (100) according to any one of claims 1 to 6, further comprising a forming area disposed at a starting end of the winding station (110). 8. During winding of the metal strip onto a new coil in the winding station (110), the frame (114) is pivoted to a winding position by means of the rotary drive (125); 8. The coil box (100) of claim 7, wherein in this winding position, the first roller and the second roller form an oblique plane inclined toward the forming area. 9. In a system having a coil box (100) according to any one of 1 to 8 above and one coil (20), the additional roller (116) - and also the further additional roller (115), if present - are Further, in the frame (114), -the frame is pivoted from the first transition position (P1) by an angle αP2 to the second transition position (P2) in which the additional roller (116) or the further additional roller (115) first contacts the coil (20) carried by the second roller (112) and the third roller (123); a horizontally projected distance xzp or xwzp between the rotation axis of the additional roller (116) or the further additional roller (115) and the rotation point of the frame (114) is smaller than a horizontally projected distance xcp between the center of gravity of the coil (20) and the rotation point (D) of the frame (114); The bearing is supported in rotation as shown in the figure. A system characterized by: 10. -When the frame is pivoted beyond the third transition position (P3) to the transfer position (P4) and the coil (20) is supported only by the third roller (123) and the additional roller (116)-, The coil 20 is lowered, with its lowest point on its outer circumference, below the upper edge of the third roller (123) by no more than a predetermined maximum allowable distance (Amax). 10. The system according to claim 9, characterized in that 11. A method for operating a coil box (100) according to any one of 1 to 8 above, comprising: The method comprises the following method steps: winding the metal strip into a coil (20) in the winding station of the coil box; and by applying a tension force to the start end of the metal strip wound onto the coil and by lifting at least the second roller (112) of the winding station (110) to a transfer position (P4) by pivoting the frame about the rotation point (D), transporting the wound coil (20) through a number of transfer positions (P1, P2, P3) inside the winding station (110) into the unwinding station (120) of the coil box (100) arranged subsequently in the material flow direction (R), To reach the transfer position (P4), The frame having the first roller and the second roller, which are supported for rotation in the frame, as well as the additional roller (116) and, optionally, the further additional roller (115), The additional roller (116) or the further additional roller (115) is raised above the horizontal roller table plane (E1) formed by the first roller (111) and the second roller (112) at the first transition position (P1). The frame is pivoted about a rotation point (D), and the coil (20) at the transfer position (P4) is supported only by the third roller (123) and the additional roller (116) and is in an approximately unstable equilibrium state; The method comprising: 12. When one of the rollers in the frame (114), in particular the additional roller (116), is raised above the horizontal roller table plane (E1) formed by the first roller (111) and the second roller (112) at their starting positions; and when it reaches its respective upper end position (Top2) in the transfer position (P4), a position signal is generated; the position signal is used as a confirmation that the coil (20) has been securely removed from the winding station (110); 12. The method according to claim 11, characterized in that 13. The method according to claim 12, characterized in that only in response to the generated confirmation signal is a new metal strip allowed to enter the forming area of ​​the coil box (100) for forming a new coil. 14. For the transfer of the coil from the transfer position (P4) into the unwinding station (120), a pulling force is applied to the start end of the metal strip wound onto the coil (20) and / or the third roller (123) is lowered relative to the roller table plane (E1); At the unwinding station, the coil is stably supported on the third roller (123) and the fourth roller (124). 14. The method according to any one of claims 11 to 13, characterized in that 15. The method according to claim 14, characterized in that the tensile force is applied by a rolling stand for rolling the metal strip, which is arranged downstream of the unwinding station (120) in the direction of material flow. [Explanation of symbols]

[0030] 100 Coil Box 110 Winding Station 111 First Roller 112 Second Roller 114 Frames 115 Another additional roller 116 Additional Roller 120 Unwinding Station 123 The Third Roller 124 The Fourth Roller 125 Rotational Drive Unit 130 Mobile Device 140 Position detector 20 Coil Alpha frame rotation angle αP2: Frame rotation angle at the second transition position Amax Maximum distance D Rotation point E1 Horizontal roller table plane P1 First transition position P2 Second transition position P3 3rd transition position P4 Delivery position R Material flow direction = coil transport direction Top2: The highest position of the second roller V Virtual bond line w Predefined interval r2 Radius of roller 116 r3 Radius of roller 123 xcp projected interval xzp projected interval x2 radial spacing x3 radial spacing xz Radial spacing

Claims

1. A coil box (100), This coil box is a winding station (110) for winding the metal strip into a coil (20), the winding station being formed of a number of rollers, a first roller (111) and a second roller (112) of which are rotatably supported in a common frame (114); from a winding position where the metal strip is wound onto the coil (20), through a number of transfer positions (P1, P2, P3) through which the finished wound coil passes, to a delivery position (P4) for delivery of the coil to an unwinding station (120); a rotation drive (125) for pivoting the frame (114) with the first and second rollers by a rotation angle α about a rotation point (D) in the area near the first roller (111); and, said unwinding station (120) formed by at least one third roller (123) and a fourth roller (124), in which said metal strip can be unwound from said coil (20); the unwinding station (120) is arranged following the winding station (110) in the material flow direction (R); and the second roller (112) is arranged following the first roller (111) and the fourth roller (124) is arranged following the third roller (123) in the material flow direction (R), and the rotation axes of all the rollers are aligned parallel to each other; In the coil box, at least one additional roller (116) rotatably supported in said frame (114); the rotation axis of the additional roller is parallel to the rotation axis of the first roller to the fourth roller; and The rotation axis of the additional roller (116) is the radial spacing xz of the axis of rotation of the additional roller relative to the point of rotation (D) of the frame (114) is greater than the radial spacing x2 of the point of rotation of the second roller relative to the point of rotation of the frame; the radial spacing xz of the axes of rotation of the additional roller (116) plus the radius of this additional roller (116) is smaller than the minimum radial spacing x3 of the point of rotation of the third roller (123) relative to the point of rotation (D) of the frame (114) minus at least the radius of the third roller, and the uppermost point of said additional roller is in a first transition position (P1), the uppermost points of the first roller and the second roller form a horizontal roller table plane (E1), and are located below this roller table plane (E1) by a predetermined distance w, being positioned in said frame (114) so ​​as to A coil box (100) comprising:

2. 2. The coil box (100) according to claim 1, characterized in that, at the transfer position (P4), the second roller (112) reaches its upper end position (Top2).

3. 3. The coil box (100) of claim 1 or 2, wherein the additional roller (116) has a diameter smaller than a diameter of the first roller, the second roller, the third roller, or the fourth roller.

4. 4. The coil box (100) according to claim 1, characterized in that at least one moving device (130) is provided for selective individual moving of the third roller (123) and / or the fourth roller (124) below the roller table plane (E1) formed by the first roller (111) and the second roller (112).

5. Between the second roller (112) and the additional roller (116) there is provided another additional roller (115) which is also rotatably supported in the frame, so that this further additional roller projects with its outer periphery beyond an imaginary tangential joining line (V) - directed towards the roller table plane (E1) - between the outer periphery of the second roller (112) and the outer periphery of the additional roller (116), The coil box (100) according to any one of claims 1 to 4, characterized in that the further additional roller is positioned in the frame (114).

6. A position detector (140) is provided for generating a position signal, which indicates the position of the additive roller by: A coil box (100) according to any one of claims 1 to 5, characterized in that this additional roller is raised to or above the height of the roller table plane (E1) formed by the first roller (111) and the second roller (112) in the first transition position (P1).

7. a coil box having an inlet roller for guiding a new metal strip entering the coil box and a bending roller and a forming roller for forming the start end of the new metal strip into a coil eye for a coil to be newly wound in the winding station, 7. The coil box (100) according to claim 1, further comprising a forming area arranged at the start end of the winding station (110).

8. During winding of the metal strip onto a new coil in the winding station (110), the frame (114) is pivoted to a winding position by means of the rotary drive (125), 8. The coil box (100) of claim 7, wherein in the winding position, the first roller and the second roller form an oblique plane that is inclined toward the forming area.

9. In a system having a coil box (100) according to any one of claims 1 to 8 and one coil (20), the additional roller (116) - and also the further additional roller (115), if present - is Further, in the frame (114), - the frame is pivoted from the first transition position (P1) by an angle αP2 to a second transition position (P2) in which the additional roller (116) or the further additional roller (115) first comes into contact with the coil (20) carried by the second roller (112) and the third roller (123); a horizontally projected distance xzp or xwzp between the rotation axis of the additional roller (116) or the further additional roller (115) and the rotation point of the frame (114) is smaller than a horizontally projected distance xcp between the center of gravity of the coil (20) and the rotation point (D) of the frame (114); The bearing is supported in rotation as shown in the figure. A system characterized by:

10. - when the frame is pivoted beyond the third transition position (P3) to the transfer position (P4) and the coil (20) is supported only by the third roller (123) and the additional roller (116) - the coil 20 is lowered, with its lowest point on its outer circumference, below the upper edge of the third roller (123) by no more than a predetermined maximum allowable distance (Amax); 10. The system of claim 9.

11. A method for operating a coil box (100) according to any one of claims 1 to 8, comprising the steps of: The method comprises the following method steps: winding the metal strip into a coil (20) in the winding station of the coil box; and - by applying a tension force to the start end of the metal strip wound onto the coil and by lifting at least the second roller (112) of the winding station (110) to a transfer position (P4) by pivoting the frame about the rotation point (D), the transport of the wound coil (20) through a number of transfer positions (P1, P2, P3) inside the winding station (110) into the unwinding station (120) of the coil box (100) arranged subsequently in the material flow direction (R), To reach the transfer position (P4), The frame having the first roller and the second roller, which are supported for rotation in the frame, as well as the additional roller (116) and possibly further additional rollers (115), so that the additional roller (116) or the further additional roller (115) is raised above the horizontal roller table plane (E1) formed by the first roller (111) and the second roller (112) at the first transition position (P1); Pivoting around a rotation point (D) of the frame; and the coil (20) at the transfer position (P4) is supported only by the third roller (123) and the additional roller (116) and is in an approximately unstable equilibrium state; The method comprising:

12. when one of the rollers in the frame (114), in particular the additional roller (116), is raised above the horizontal roller table plane (E1) formed by the first roller (111) and the second roller (112) at their starting positions; and when it reaches its respective upper end position (Top2) in the transfer position (P4), a position signal is generated; the position signal being used as a confirmation that the coil (20) has been securely removed from the winding station (110); The method according to claim 11, characterized in that

13. 13. The method according to claim 12, characterized in that only in response to the generated confirmation signal is a new metal strip allowed to enter into the forming area of ​​the coil box (100) for forming a new coil.

14. for the transfer of the coil from the transfer position (P4) into the unwinding station (120), a pulling force is applied to the start end of the metal strip wound onto the coil (20) and / or the third roller (123) is lowered relative to the roller table plane (E1), At the unwinding station, the coil is stably supported on the third roller (123) and the fourth roller (124).

14. The method according to any one of claims 11 to 13.

15. 15. The method according to claim 14, characterized in that the tensile force is applied by a rolling stand for rolling the metal strip, which is arranged downstream of the unwinding station (120) in the direction of material flow.

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