Method, reel device and computer program for operating the reel device

Abstract

The invention relates to a method and a computer program for operating a reel device (100). The reel device (100) comprises a reel mandrel (120) for winding up a strip material (20). For this purpose, the reel mandrel has a plurality of segments (124) distributed over the perimeter thereof, which are each joined, via at least two link plates, to a control rod (122) that can be axially moved in the reel mandrel, for radially extending and retracting the segment into at least one operating position. In order to be able to reliably identify wear statuses of internal components of the reel mandrel that are not visible from the outside, the method according to the invention provides that, during the service life of the reel device, the segments are repeatedly moved into determined operating positions and the respective distances of the segments in relation to a stationary operating position are determined. The distances recorded at different times are then evaluated in terms of whether they exceed or fall below a predefined threshold value during the service life of the reel device. In this case, it is concluded that there is wear.

Description

[0001] METHOD, REEL DEVICE AND COMPUTER PROGRAM FOR OPERATING THE REEL DEVICE

[0002] The invention relates to a method for operating a coiling device, wherein the coiling device comprises a coiling mandrel for winding a strip, preferably a metal strip. The coiling mandrel has at least one, typically a plurality of, segments distributed around its circumference, each of which is hinged via at least two tabs to a control rod axially displaceable within the coiling mandrel for radially extending and retracting the segment into at least one operating position. Furthermore, the invention relates to the coiling device itself.

[0003] Such coiling devices are well known and subject to high mechanical stress in the daily operation of a rolling mill. Accordingly, wear on the moving parts of the coiler mandrel is inevitable. A distinction must be made between wear that is externally visible and wear that is not. Japanese patent application JP 2000-226141 A deals with wear that occurs on the outer surfaces of the segments on which the strip or metal strip is wound.

[0004] In contrast, there is currently no way to detect wear on the lugs or the housing of the compression spring unit when the coiler mandrel is installed. There are, however, soft indicators, such as the rattling of the segments during idle operation or indirect measurements with pressure rollers, that indicate wear on the aforementioned internal components of the coiler mandrel. Furthermore, routine maintenance of the coiler mandrel typically occurs when the wound tonnage has exceeded a specified weight threshold. However, these methods do not allow for a precise determination of the optimal replacement time for wear parts. Therefore, a wear-optimized service life of the coiler mandrel is not possible. This results in unnecessary costs due to suboptimal utilization of the coiler mandrel's service life.

[0005] The invention is based on the object of developing a known method and computer program for operating a reeling device as well as a corresponding known reeling device itself in such a way that even wear conditions of internal components of the reel mandrel that are not visible from the outside are reliably detected without the reel mandrel having to be disassembled into its components.

[0006] This object is achieved by the method claimed in patent claim 1. The method is characterized by the following steps: b) directly or indirectly determining and storing the radial distance of the segment in the operating position relative to a fixed reference position at various times during the period of use; c) evaluating the distances stored at the various times with regard to whether they exceed a predetermined upper threshold value or fall below a predetermined lower threshold value over the course of the period of use of the reeling device; and d) indirectly detecting a wear condition of the reeling device if the detected radial distances exceed the upper threshold value or fall below the lower threshold value from one of the times.

[0007] If individual internal components of the reel mandrel become subject to wear over the course of their service life, this results in various predetermined operating positions for the segments of the reel mandrel, which could still be reached at an initial time of use, no longer being able to be reached precisely at a later time of use after interim use and wear. In particular, the controlled operating positions at the later time of use no longer correspond to the operating positions as they were controlled at the first time of use, e.g., when the reel mandrel was in new condition. The difference in the controlled operating positions is reflected in changed distances between the controlled operating positions and fixed reference positions over the course of the reel mandrel's service life.

[0008] The present invention provides for determining the change in the controlled operating positions over the service life of the reel mandrel in order to be able to draw conclusions about wear of internal components of the reel mandrel.

[0009] The term "determining ... the radial distance..." should be interpreted broadly. "Determining" includes, in particular, measuring and / or simulating the radial distance.

[0010] In the phrase "Direct or indirect determination and storage of the radial distance...", "direct determination" means the actual determination of the specific radial distance. In contrast, "indirect determination" means the determination of a physical quantity representing the radial distance.

[0011] The term "determining and storing the radial distance of the segment ... at various times during the deployment" also includes a so-called "time-continuous" determination and storage of the distances with arbitrarily small temporal resolution. Two of these times define an observation period during the deployment.

[0012] The term “stationary” here means: The segment can be moved relative to the fixed reference position.

[0013] The term "indirect detection" refers to the fact that wear conditions are not directly visible to an observer from the outside, because components inside the coiler mandrel may be affected by wear. If the measured and stored distances exceed or fall below their corresponding predetermined thresholds, this information can be used to determine the wear conditions.

[0014] In general, whether the observed distances increase or decrease due to the wear observed here depends on the position of the fixed reference position in relation to the segments. In this description, it is generally assumed that the fixed reference position is located radially further inside the coiler mandrel than the segments. For example, the upper edge of a housing of the compression spring unit is selected as the fixed reference position. In principle, however, any other fixed position in space can be selected as the reference position; for example, fixed points in space that are radially further out than the segments can also be selected as the reference position. In this case, the inventive evaluation of the stored distances with regard to whether they exceed or fall below a threshold value over the course of their service life must be reversed.This is what is meant by the phrase “or vice versa”.

[0015] The present invention assumes that the compression spring unit is not subject to wear.

[0016] The present invention provides for an at least temporary intelligent evaluation of the distances between the segments in an operating position relative to a fixed reference position during their service life, preferably beginning with the new condition or a comparable fault-free condition after maintenance. Based on these stored distances, the method according to the present invention allows a precise statement to be made regarding the wear pattern of the essential wearing parts of the coiler mandrel. By implementing the method according to the invention, the user of the coiler mandrel can very accurately detect gradual wear, even of internal components of the coiler mandrel, and thus plan a targeted replacement or targeted maintenance of the coiler mandrel during an already impending downtime of the coiler mandrel, without having to excessively shut down the system.

[0017] According to a first embodiment, the first operating position is a pre-spread winding position of the segment without wound strip. If, over the course of the service life of the coiler device, an increasing increase in the distance of the segment in the winding position relative to the fixed reference position is detected when approaching the winding position, then, according to the invention, a conclusion is drawn about the wear condition in the form of an undesired elongation of the lashing and / or a deflection of the joint holes on the lashings and / or wear on the fastening bolt with which the lashings are articulated to the control rod. This applies in particular if the stored distances exceed the specified upper threshold value, or vice versa.

[0018] According to a second alternative embodiment, the second operating position is a winding position of the segment in which at least one turn, preferably a plurality of turns, of the strip have already been wound onto the segment and the coiler mandrel. If, for this operating position, an increasing reduction in the distance of the segment relative to the radially further inner, fixed reference position is detected over the service life of the coiler device, the method according to the invention provides for inferences to be drawn regarding the state of wear in the form of undesired abrasion on the surface of the ramp on the outside of the control rod and / or on the underside of the housing of the compression spring unit. This applies in particular if the distances stored over the service life fall below the predetermined lower threshold value.The terms “starting winding position” for the first operating position and “winding position” for the second operating position are fundamentally different from one another. In the context of the present invention, the starting winding position refers to a position in which the segments are slightly extended in the radial direction compared to their collapsed position and in which winding of the strip onto the coiler mandrel or onto the segments of the coiler mandrel begins. Starting winding means that initially only a few turns, but not the entire length of the strip, are / is wound onto the coiler mandrel. During the winding of typically 1-7 turns of the strip onto the coiler mandrel, the wound strip exerts a radial compression force on the compression spring unit of the coiler mandrel due to increasing strip tension, counter to the radially outward-acting spring pressure force of the compression spring unit.As a result, the at least one segment is displaced into a compression position that is radially further inward than the winding position.

[0019] To ensure sufficient static friction between the segments and the innermost layer of the wound strip for subsequent continuation of the strip winding process, the segment is moved radially outward from the compression position into a winding position, where the strip is wound onto the coil mandrel. The winding position can coincide radially with the initial winding position; however, the winding position can also be radially further inward or outward than the initial winding position. This depends on the specified force with which the segments are to be pressed against the coil of the strip being wound.

[0020] According to a third embodiment, the operating position is the discharge position of the segment on the coiler mandrel. This means that the segment is retracted, against the spring force of the compression spring unit, to an outer diameter that is smaller than the diameter of the eye of a coil previously wound on the coiler mandrel. In this discharge position, it is therefore possible to discharge a previously fully wound coil from the coiler mandrel. However, the outer diameter of the segments in the discharge position is typically larger than in the collapsed state, in which the segments are retracted as far together as possible and the outer diameter is minimal.

[0021] At the beginning of an observation period, the distance of the segment in the discharge position relative to a radially further inner reference position is still minimal. Due to undesirable elongation of the plates and / or undesirable deflection of the hinge holes on the plate and / or wear of the fastening bolt with which the plate is hinged to the control rod, this distance becomes increasingly larger with increasing service life of the reel mandrel. If the stored distances exceed a predetermined upper threshold value over time, then this is an indication within the meaning of the invention that at least the plates may exhibit the aforementioned signs of wear and should therefore be replaced.

[0022] According to a further aspect of the method according to the invention, it is expedient for at least one, but preferably all, of the operating positions to lie within the elastic linear spring range of the compression spring unit. This is a prerequisite for the operating positions to be repeatedly and reversibly controlled during the service life of the coiler mandrel and for the distances measured between a reached operating position and the stationary reference position to be objectively compared with one another. If the operating positions were within the non-linear spring range of the compression spring unit, they would be within the range of plastic deformation of the compression spring unit; an objective evaluation of the distances would then no longer be possible.Advantageously, the method according to the invention serves not only to detect possible wear conditions of internal components of the coiler mandrel, but also to initiate appropriate maintenance as early as possible, before a failure of individual components or undesirable losses in the quality of the strip to be wound up occurs.

[0023] Modern coiling devices are designed for use in the harsh daily operating conditions of a rolling mill; accordingly, wear typically does not occur shortly after commissioning, but only after a longer period of use of the coiling mandrel, typically several weeks or months. It is therefore sensible to compare the distances between an operating position and a fixed reference position, recorded and stored according to the invention, only at longer intervals, preferably at intervals of several months. This does not preclude the possibility of recording the distances between the operating positions and the reference positions at shorter intervals, preferably continuously throughout the service life of the coiling mandrel.

[0024] The above-mentioned object of the invention is further achieved by a computer program product according to claim 9 and a reeling device according to claim 10. The advantages of these solutions correspond to the advantages mentioned above with reference to the claimed method.

[0025] Further advantageous embodiments are the subject of the dependent claims.

[0026] The description includes a total of 11 figures, of which

[0027] Fig. 1 shows a coiling device; Fig. 2 shows a compression spring unit with its characteristic curve;

[0028] Fig. 3 a longitudinal section through a reel mandrel with the segments in a first operating position without wear;

[0029] Fig. 4 shows the longitudinal section according to Fig. 3 with the extended segments in the first operating position with existing wear;

[0030] Fig. 5 is a diagram illustrating the change in the distances A1 during the period of use;

[0031] Fig. 6 a longitudinal section through the coiler mandrel with the segments in a second operating position without wear;

[0032] Fig. 7 shows the longitudinal section according to Fig. 6 with the segments in the second operating position with existing wear;

[0033] Fig. 8 is a diagram illustrating the temporal change of the distances A2 during the service life of the reel dome;

[0034] Fig. 9 is a longitudinal section of the reel mandrel with the segments in a third operating position without wear;

[0035] Fig. 10 shows the longitudinal section according to Fig. 9 with existing wear; and

[0036] Fig. 11 shows the change in distance A3 during the service life of the reel mandrel. The invention is described in detail below with reference to the figures mentioned in the form of exemplary embodiments. In all figures, the same technical elements are designated by the same reference numerals.

[0037] Fig. 1 shows a coiling device 100. It has a coiling mandrel 120 for winding a strip, in particular a metal strip. The coiling mandrel 120 is rotationally driven by a rotary drive device 130. The rotary drive device 130 is controlled by a control device 140. The coiling mandrel itself has a control rod 122, which is axially displaceable within the coiling mandrel 120 by means of a push / push drive 110. The push / push drive 110 is also controlled by the control device 140. The coiling mandrel 120 has at least one, but typically a plurality of, radially expandable segments 124 on its periphery, which are arranged distributed over the circumference of the coiling mandrel 120. The segments 124 are typically hinged to the control rod 122 via at least two tabs 125, 126.In this way, the segments 124 can be radially extended into various operating positions and retracted again, depending on the axial displacement position of the control rod 122. The segments 124 are each held under a radial preload FD by means of at least one compression spring unit between the segment and the control rod. The compression spring units 150 are guided in the radial direction in the coiling device 100 by means of guides 128, see Fig. 3. When the segment is extended or retracted in the radial direction, the compression spring units 150 are also moved in the radial direction. This occurs by sliding with the inclined undersides of their housings along a ramp 123 of the control rod 122 when the control rod is displaced in the axial direction.

[0038] Fig. 2 shows the compression spring unit 150, which holds the segment 124 under the radial preload FD. For the present invention, it is assumed that the compression spring unit 150 operates wear-free within its elastic operating range. The compressive force FD exerted by the compression spring unit 150 is linearly dependent on its spring travel.

[0039] The linearly increasing characteristic curve in Fig. 2 shows the radial movement of the surface of the housing 153 as a function of the spreading stroke of the control rod 122 with its ramp 123. The simultaneous radial movement of the unloaded (i.e., no tape is wound) segments 124 is shown by the curved curve above. The non-linear progression is due to the fact that the tabs 125, 126 rotate around their bearing point during radial spreading. The spring in the compression spring unit 150 compensates for the discrepancy between linear movement and rotational movement with the spring travel. As a result, the segment 124 is always tensioned radially outward in the unloaded state.

[0040] Fig. 3 shows a detailed longitudinal section through the reel mandrel 120. The compression spring unit 150 can be seen, which presses against the segment 124 from below with the compressive force FD exerted by it, thus holding the segment under radial preload. The compression spring unit 150 is guided in the radial direction R and slides with the inclined underside of its housing 153 on a ramp 123 of the control rod 122. When the control rod 122 is displaced in the axial direction L, the aforementioned sliding movement occurs, and the compression spring unit 150 is thus moved in the radial direction. Because the compression spring unit 150 holds the segment 124 under the aforementioned preload, an axial displacement of the control rod 122 radially displaces or positions not only the compression spring unit 150 but also the segment 124. Specifically, the segment 124 can be moved or positioned into various radial operating positions in this way.In order to build up the aforementioned preload on segment 124, its radial freedom of movement is limited by two tabs 125, 126, counter to the compressive force FD of compression spring unit 150. The tabs 125, 126 are each pivotably mounted at their lower ends via fastening bolts 121 on the coiler mandrel 120, in particular the control rod 122, and they each have an elongated hole at their opposite upper ends, in which the segment 124 is pivotally mounted.

[0041] As can be further seen in Fig. 6, the surface or upper side of the housing 153 of the compression spring unit 150 forms an upper or inner stop for the compression of the compression spring unit. This means that at maximum compression, the segment 124 rests on the surface of the housing 153 of the compression spring unit 150.

[0042] A distance sensor 160 is provided for detecting the distance of the segment 124 in a first operating position P1, in a second operating position P2, or in a third operating position P3, in each case relative to a stationary operating position PO. This stationary operating position PO is selected in Fig. 3, for example, in the form of the upper edge of the radial guide 128. In principle, however, any other position in space that is stationary relative to the relative movement of the segment 124 is also suitable as a reference position.

[0043] The lower half of Fig. 3 shows a measuring chain for the measurement signal detected by the distance sensor 160, which represents the direct or indirect radial distance of the segment 124 in each of the operating positions. The distance values ​​determined by the distance sensor are stored in a memory device 170 and evaluated in an evaluation device 180 with regard to any existing wear of individual components of the coiler mandrel. If wear is detected, a corresponding message is sent to an operator of the coiler device 100 or to a signaling center, preferably combined with a recommendation to replace the worn components of the coiler mandrel 120. The output of the message is symbolized in the measuring chain by the reference numeral 190. The signal just described with reference to Fig.The structural design of the reeling device 100 and in particular of the reeling mandrel 120 described in Fig. 3 applies equally to Figs. 4, 6 and 7 as well as to Figs. 9 and 10.

[0044] The method according to the invention for operating the described coiler mandrel is explained in more detail below with reference to the figures mentioned for various operating positions. Figures 3, 6, and 9 each show the coiler mandrel in a wear-free state, while Figures 4, 7, and 10 show the coiler mandrel with wear.

[0045] In order to detect a state of wear of the link plates 125, 126, the method according to the invention provides that the segment 124 is moved several times over the service life of the reeling device into a first operating position P1, also called the start-up position. The radial movement takes place in each case under the pretension applied by the compression spring unit 150. In the start-up position, the segment 124 is moved up a little in the radial direction compared to the collapsed state of the reel mandrel, specifically to a distance A1 relative to the fixed reference position PO. The radial distance A1 is determined and stored at different times over the service life. The hinge bores 127 in the link plates 125, 126 are subject to wear over the service life of the reel mandrel due to the large radial forces acting; i.e. these hinge bores 127 can become "worn out".Alternatively or additionally, the plates 125, 126 themselves may also be subject to wear, in that they experience plastic elongation with increasing endurance. The fastening bolts 121 may also wear locally, with the consequence that, for example, their diameter then decreases locally. These three wear phenomena result in the measured radial distances A1 for the first operating position P1 becoming increasingly larger over the course of the service life of the reel mandrel 120. The stored distances A1 are therefore evaluated according to the method according to the invention to determine whether they exceed a predetermined upper threshold value S1 from a certain point in time during the service life. If the reaching or exceeding of this first upper threshold value S1 is detected, the method according to the invention provides for indirect detection of or a conclusion regarding the said wear states of the plates 125, 126 or the fastening bolts 121.

[0046] As mentioned above, Fig. 3 shows a wear-free or low-wear state of the reel mandrel, in which the determined distance A1 is still smaller than the first upper threshold value S1. In contrast, Fig. 4 shows the same reel mandrel 120 in a state in which the tabs 125, 126, their joint bores 127, and / or the fastening bolts 121 are subject to wear. The wear state is evident in Fig. 4 in that the determined distance A1 is greater than in Fig. 3 and, in this case, has already reached the upper threshold value S1.

[0047] Fig. 5 illustrates the temporal development of the distances A1 over the course of the service life of the reel mandrel 120. It can be seen that the measured distances A1 are smaller at an early point in time, when the plates 125, 126 are subject to no or only slight wear, than at a later point in time, when the plates are subject to wear. Fig. 5 schematically shows the determined distances at different points in time, with each black dot corresponding to the determined distance at a specific point in time. Over the course of time or over the course of the service life of the reel mandrel, a shift of such a cluster of measured values ​​towards larger distances can be seen. In practice, it is advisable to determine mean values ​​of the distances A1 in specific time windows and to evaluate these instead of the large number of individual measured values.

[0048] 3, 4 and 5 illustrate the method according to the invention, as stated, for the first operating position, i.e., the so-called start-up position, as explained above in the general part of the description. In contrast, Figs. 6, 7 and 8 relate to the method according to the invention in the so-called winding position, as also explained above in the general part of the description. In Figs. 6 and 7 it can be seen that in the second operating position, i.e., the winding position, the compression spring unit 150 is maximally compressed, i.e., the segment 124 rests on the upper edge of the housing 153 of the compression spring unit 150. The radial compression force, which counteracts the compressive force FD of the compression spring unit 150, is generated by the strip tension of the plurality of windings of the strip 20, which are wound onto the segments 124 of the reel mandrel 120 in the winding position.At the same time, in the winding position, the compression spring unit 150 is extended radially to a distance A2 relative to the stationary reference position PO in order to ensure sufficiently tight winding of the strip 20 on the segments 124. In the wear-free state, as shown in Fig. 6, the distance A2 is greater than a lower threshold value S2. The radial extension of the segments 124 to the distance A2 is achieved by axially moving the control rod 122 to the left; the compression spring unit 150, guided in the radial direction R by the guides 128, then slides upwards in the radial direction R on the ramp 123 of the control rod 122.

[0049] Over the course of the service life of the coiler mandrel 120, the sliding surface 129 between the sloping underside of the housing 153 of the compression spring unit 150 and the upper side of the ramp 123 is subject to wear, as shown in Fig. 7. Due to the wear, i.e. as a result of wear, the sliding surface 129 in Fig. 7 is lowered compared to the wear-free state according to Fig. 6. Therefore, when the control rod 122 is moved axially, the compression spring unit 150 no longer reaches the same radial distance A2 by the same amount as without wear according to Fig. 6. Rather, the radial extension state, represented by the distance A2 of the segment 124 relative to the fixed reference position PO, decreases continuously over the course of the service life of the coiler mandrel, see Fig. 8. As soon as the wear has reached a certain level, the radial distance A2 decreases to the lower distance threshold value S2 or below.If the evaluation of the radial distances according to the method according to the invention detects this situation, it is concluded that there is severe wear on the said sliding surfaces and a corresponding recommendation is issued to replace the control rod 122 and / or the housing 153.

[0050] Finally, Figs. 9 to 11 relate to a third operating position for the coiler mandrel, the so-called discharge position. Fig. 9 shows a wear-free state; Figs. 10 and 11 relate to the state with wear. After the strip 20 has been wound into a coil in the winding position, the segments on the coiler mandrel must be retracted radially a short distance in order to be able to pull the coil off the coiler mandrel. This position of the segments is the aforementioned discharge position, represented in Figs. 9 to 11 by the radial distance A3 relative to the fixed reference position PO. The distance A3, measured at various times during the service life of the coiler mandrel 120, is also suitable for indirectly detecting wear on the plates 125, 126, their hinge holes 127, and / or the fastening bolts 121.For the transition from the winding position to the discharge position, the control rod 122 is moved to the right, whereby the compression spring unit 150 is glidingly lowered on the ramp 123 to the distance A3. In the wear-free state of the link plates according to Fig. 9, the radial distance A3 or the third operating position lies below a predetermined second upper threshold value S3. As can be seen from Figs. 10 and 11, this radial distance A3 increases increasingly over the course of the service life of the reel mandrel 120 with increasing wear. After a certain service life, the radial distance A3 reaches the upper threshold value S3. In this case, the method according to the invention indirectly detects the presence of the said wear condition in the link plates 125, 126, in their joint bores 127 and / or in the fastening bolts 121 for the link plates. In this case, too, the said wear condition is reported, and replacement of the link plates is recommended.

[0051] List of reference symbols

[0052] 20 band, especially metal band

[0053] 100 reel device

[0054] 110 Push-Z-thrust drive for control rod

[0055] 120 Reel Dome

[0056] 121 Fastening bolt for tab

[0057] 122 control rod

[0058] 123 Ramp

[0059] 124 segments

[0060] 125, 126 tab

[0061] 127 Joint hole in the tab

[0062] 128 radial guide for compression spring unit

[0063] 129 Sliding surface between compression spring unit and ramp

[0064] 130 Rotary drive device

[0065] 140 Control device

[0066] 150 compression spring unit

[0067] 153 housings

[0068] 160 distance sensor

[0069] 170 Storage device

[0070] 180 Evaluation device

[0071] 190 Issue Message

[0072] A1 radial distance

[0073] A2 radial distance

[0074] A3 radial distance

[0075] FD radial compressive force, radial preload

[0076] L axial direction

[0077] PO fixed reference position

[0078] P1 1st operating position (= winding position) P2 2nd operating position (= winding position)

[0079] P3 3rd operating position (= discharge position)

[0080] R radial direction

[0081] S1 upper distance threshold for winding position S2 lower distance threshold for winding position

[0082] S3 upper distance threshold for discharge position

Claims

Patent claims:

1. A method for operating a reeling device (100), wherein the reeling device has a reel mandrel (120) for winding up a strip (20), in particular a metal strip, wherein the reel mandrel (120) has at least one segment (124) distributed around its circumference, which segment is articulated via at least two tabs (125, 126) to a control rod (122) axially displaceable in the reel mandrel (120) for radially moving the segment (124) into at least one predetermined operating position (P1, P2, P3), and wherein the reel mandrel (120) has at least one compression spring unit (150) for holding the segment (124) under a radial prestress (FD); comprising the following steps: a) multiple movement of the segment (124) over the course of the service life of the reel device (100) into the operating position (P1, P2, P3), in each case under the pretension (FD), wherein the tabs (125, 126) and / or the control rod (122) are subject to wear;characterized by b) directly or indirectly determining and storing the radial distance (A1, A2, A3) of the segment (124) in the operating position relative to a fixed reference position (PO) at different times during the period of use; c) evaluating the distances (A1, A2, A3) stored at the different times with regard to whether they exceed a predetermined upper threshold value (S1, S3) or fall below a predetermined lower threshold value (S2) during the period of use of the reeling device (100); and d) indirectly detecting a state of wear of the reeling device (100) if the detected radial distances (A1, A2, A3) exceed the upper threshold value (S1, S3) from one of the times onwards; fall below the lower threshold value (S2). Method according to claim 1, characterized in that a first operating position (P1) is a pre-spread winding position of the segment (124) without a wound strip (20); that in step c) over the course of the service life of the reeling device (100) an increasing increase in the distance (A1) is determined; and that in step d) the wear condition in the form of an undesired elongation of the plates (125, 126), a deflection of joint bores (127) on the plates and / or of their fastening bolts (121) is indirectly detected when the stored distances (A1) exceed the predetermined upper threshold value (S1), or vice versa.Method according to claim 1, characterized in that the control rod (122) has at least one ramp (123) on its circumference; that the compression spring unit (150) has a housing (153) with an inclined underside; and that the housing of the compression spring unit (150) slides with its inclined underside along the ramp (123) when the segment (124) is moved radially during an axial movement of the control rod; that a second operating position (P2) is a winding position of the segment (124), in which a plurality of turns of the strip (20) are wound onto the segment and the reel mandrel (120); that in step c) over the course of the service life of the reeling device (100) an increasing reduction of the distance (A2) is determined; and that in step d) the wear condition in the form of undesired abrasion on the surface of the ramp (123) and / or on the underside of the. Housing (153) of the compression spring unit (150) is indirectly detected when the stored distances fall below the predetermined lower threshold value (S2).

4. Method according to claim 3, characterized in that a transition from a winding position (P1) to the winding position (P2) comprises the following steps: - winding the strip (20) with 1-7 windings on the coiler mandrel (120) with the segment (124) in the winding position (P1), whereby a radial compression force is exerted on the compression spring unit (150) and the segment (124) is moved into a compression position; and - moving the segment back up against the compression force from the compression position into the winding position for further winding the coiler mandrel with the strip (20) to form a coil.

5. Method according to claim 1, characterized in that a third operating position (P3) is the discharge position of the segment from the coiler mandrel; that in step c) over the course of the service life of the coiler device (100) an increasing increase in the distance (A3) of the segment (124) compared to the radially further inner reference position (PO) is determined, or vice versa; and that in step d) the wear condition in the form of an undesired elongation of the link plates (125, 126), a deflection of joint bores (127) on the link plates and / or of their fastening bolts (121) is indirectly detected when the stored distances (A3) exceed the predetermined upper threshold value (S3), or vice versa.

6. Method according to one of the preceding claims, characterized in that the upper and lower threshold values ​​(S1, S2, S3) and at least one, preferably all of the operating positions (P1, P2, P3) are each located in the elastic spring range of the compression spring unit (150).

7. Method according to one of the preceding claims, characterized in that in a step e) maintenance of the coiler mandrel (120) is initiated if a wear condition is indirectly detected in step d).

8. Method according to one of the preceding claims, characterized in that the movement of the segment (124) into the operating position and the determination and storage of the radial distance (A1, A2, A3) of the segment (124) in the operating position takes place several times a day, several times a month or several times a year, preferably continuously; and that the evaluation of the stored distances (A1, A2, A3) takes place with the same or lesser frequency as the storage of the distances.

9. A computer program product loadable into the internal memory of a digital computer and comprising software code portions for carrying out the steps of the method of any preceding claim when the product is run on a computer.

10. Reeling device (100) with a reel mandrel (120) for winding a strip, in particular a metal strip, with a rotary drive device (130) for rotating the reel mandrel (120) for a reeling operation of the reeling device (100), with a push / pull drive (110) for axially displacing a control rod (122) in the coiler mandrel (120) and with a control device (140) for controlling the rotary drive device (130) and the push / pull drive; wherein the coiler mandrel has: the control rod (122); at least one radially expandable segment (124) on the circumference of the coiler mandrel (120), wherein the segment is articulated to the control rod (122) via at least two tabs (125, 126) for radially extending and retracting the segment (124) into at least one operating position in accordance with a respective axial displacement position of the control rod (122); at least one compression spring unit (150) arranged between the segment (124) and the control rod (122) for holding the segment (124) under a radial preload; characterized by at least one distance sensor (160) for repeatedly determining, directly or indirectly, the radial distance (A1, A2, A3) of the segment (124) in the at least one operating position (P1, P2, P3)) relative to a fixed reference position (PO);a storage device (170) and an evaluation device (180) for storing and evaluating a plurality of the detected distances (A1, A2, A3) with regard to their change over the service life of the reeling device (100) and specifically as to whether the detected radial distances (A1, A2, A3) exceed a predetermined upper threshold value (S1, S3) or fall below a predetermined lower threshold value (S2) over time. Reeling device (100) according to claim 10, characterized by an internal stop for the compression of the compression spring unit (150) during winding of the strip, wherein the stop is formed, for example, by the upper edge of a housing (153) which houses the compression spring unit; (150) in the non-compressed state. Reeling device (100) according to one of claims 10 or 11, characterized in that the fixed reference position (PO) is formed, for example, by the Upper edge of a guide (128) in which the compression spring unit (150) is radially guided. Reeling device (100) according to one of claims 10 to 12, characterized in that the control device (140) of the reeling device (100) is designed to carry out the method according to one of the preceding claims 1 to 8.

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