• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A stirring coil (7) for a continuous casting plant has a number n of segments (9, 9 ') which respectively surround the metal strand (6) over a partial circumference. The segments (9, 9 ') each have a plurality of coil arrangements (11, 11') around the metal strand (6). During operation, the coil arrangements (11, 11 ') of the segments (9, 9') are subjected to alternating currents (I1, I2, I3, I1 ', I2', I3 ') which, relative to the respective segment (9, 9 '), have a uniform frequency (f, f'). The alternating currents (I1, I2, I3, I1 ', I2', I3 ') are phase-shifted relative to one another in such a way that they generate a respective traveling magnetic field in the metal strand (6) whose respective direction of travel within the respective segment (9, 9') is uniform and runs in the cutting plane. The number of segments (9, 9 ') can be equal to 1. Alternatively, the traveling magnetic field generated by the coil arrangements (11, 11 ') of one of the segments (9, 9') moves in opposite directions to the traveling field generated by the coil arrangements (11, 11 ') of another of the segments (9, 9') and / or or the loading of the coil arrangements (11) of the one segment (9) with their alternating currents (I1, I2, I3) occurs uncoordinated to the loading of the coil arrangements (11 ') of the other segment (9') with their alternating currents (I1 ', I2 ', I3').
    公开号:AT518460A1
    申请号:T50230/2016
    申请日:2016-03-21
    公开日:2017-10-15
    发明作者:Hans-Peter Kogler Ing；Ing Heinrich Thoene Dipl
    申请人:Primetals Technologies Austria GmbH；
    IPC主号:
    专利说明:

    description
    A metal strand partially enclosing stirring coil
    The present invention is based on an agitating coil for a continuous casting plant, by means of which a metal strand is cast in a casting direction, the agitating coil having a number n of segments which, viewed in a cutting plane orthogonal to the casting direction, respectively surround the metal strand over a partial circumference, - Wherein the segments each have a plurality of coil arrangements have, which seen in the sectional plane follow each other sequentially, - wherein the coil arrangements of the segments are acted upon in operation with alternating currents, - wherein the alternating currents, based on the respective segment, have a uniform frequency.
    The present invention is furthermore based on a continuous casting plant, wherein the continuous casting plant has a mold and a strand guide arranged downstream of the mold, wherein the continuous casting plant furthermore has such a stirring coil which is arranged in the region of the mold and / or the strand guide.
    Such a stirring coil is known, for example, from WO 2013/174 512 A2. Stirring coils for continuous casting plants are widely used. By means of the stirring coils of the still liquid core of the cast metal strand is affected so that it is set in motion.
    In Chapter 10 "Electromagnetic Methods for Continuous Casting" of the book "The Making, Shaping and Treating of Steel", 11th edition, AISE, 2003, two basic embodiments of such stirring coils are described. On the one hand, it explains that rotary stirring coils are known which surround the cast metal strand and act like the stator of a rotary asynchronous machine. Such agitating coils move the liquid core into a rotational movement about an axis directed parallel to the casting direction. On the other hand linear stirring coils are known, which are employed only on one side of the cast metal strand. These stirring coils act like the stator of a linear asynchronous machine. They set the liquid core into a movement which is directed in one region in the casting direction and is directed in another region opposite to the casting direction. The "rotation" is in this case about an axis which extends in a direction orthogonal to the casting direction.
    In general, agitating coils of the former type are preferred because the rotation of the liquid core about an axis oriented parallel to the casting direction is technologically more advantageous. Agitator coils which completely enclose the cast metal strand can efficiently set the still liquid core in rotation. For this purpose, however, it is necessary that the coil arrangements of the stirring coil have a small distance from the cast metal strand, since otherwise the magnetic resistance in the air gap between the coil arrangements of the stirring coil and the cast metal strand is disadvantageous.
    Using continuous casting plants metal strands are often cast with different casting formats, for example, with a billet cross-section between 100 x 100 mm and 250 x 250 mm or a billet cross section between 150 x 150 mm and 400 x 400 mm. If in this case one and the same stirring coil is always used, the stirring coil must be designed for the maximum cross section. For metal strands with a smaller cross-section, this has the consequence that the distance of the stirring coil from the metal strand is greater than technologically required. Therefore, often - depending on the cross-section of the cast metal
    Stranges - different stirrers used. However, disassembling the stirring coil used to date and growing the reel spool to be used is very labor intensive and time consuming. Furthermore, several stirring coils must be kept.
    Another problem is often that the stirring coil is to be arranged in a region of the continuous casting, in which there are already other elements of the continuous casting, such as casters or spray register. As a result, the space to be converted by the stirring coil increases even further. Another problem is that a stirring coil that completely surrounds the metal strand can not be moved away from the metal strand. This is disadvantageous, in particular, in the case of a mold breakthrough or during conversions.
    From AT 513 066 A1, a stirring coil is known which has flux-conducting elements. In this stirring coil, the stirring coil itself can be used unchanged regardless of the cross section of the cast metal strand. However, depending on the cross section of the cast metal strand, the flux guide elements must be installed, removed or at least positioned.
    In the stirring coil known from WO 2013/174 512 A2, the coil arrangements each have an induction coil. About the details of the control of the coil arrangements can be found no further details. There are at least two segments present, which can be made via an adjusting device to the metal strand and removed from it. This stirring coil is advantageous in that it can be opened in particular for conversions and parked (= withdrawn) from the strand. Even with this stirring coil, however, the metal strand is completely or almost completely enclosed in the state set against the metal strand. Also, this stirring coil must therefore be dimensioned correspondingly large, so as not to hinder the other elements of the continuous casting in the employee employed on the metal strand. During the stationary casting operation of
    Continuous casting are the two segments of the stirring coil - as shown in Figures 1, 3, 7, 8 and 11 - closed, so that a design-related distance of the segments is given to the strand. Only in emergencies, the segments are opened, causing damage to the stirring coil is to be prevented. An employment of segments closed segments to minimize the distance to the strand is not possible. Agitator coils, which act like the stator of a linear asynchronous machine, are generally adjustable in a relatively simple manner both against the metal strand and away from it. Furthermore, they are often movable in a relatively simple manner along the metal strand. However, they stir the liquid core only in the casting direction. The advantages of stirring around an axis running in the casting direction can not be achieved with such stirring coils.
    The object of the present invention is to provide articles, by means of which, on the one hand, a stirring of the liquid core of the cast metal strand around a casting axis is allowed around, but on the other hand, a simple Aufbarbarkeit to the metal strand and a simple mobility along the Metal strands should be possible.
    The object is achieved by a stirring coil for a continuous casting with the features of claim 1. Advantageous embodiments of the stirring coil according to the invention are the subject of the dependent claims 2 to 7.
    According to the invention, a stirring coil of the type mentioned above is configured in such a way that in a first operating mode of the stirring coil the alternating currents are phase-shifted with respect to each other in such a way that the alternating currents of the coil arrangements of the respective segment in the metal strand generate a respective magnetic traveling field , whose respective direction of travel within the respective segment is uniform and runs in the sectional plane, and - that the number n of segments η = 1 or the number n of segments η> 1, - where for η> 1 that of the coil arrangements one of the segments generated in the first operating mode migrates magnetic traveling field in the opposite direction to the traveling field generated by the coil arrangements of another of the segments in the first operating mode and / or in the first operating mode, the application of the coil arrangements of the one segment with their alternating currents uncoordinated to the Bea Replacement of the coil arrangements of the other segment with their alternating currents takes place.
    In particular, it was recognized that by means of a single segment in the metal strand forces can be exerted only on a part of the still liquid core of the metal strand. However, the forces act (at least substantially) with a sufficient distance from the central axis of the cast metal strand and in the orthogonal to the casting direction extending cutting plane. Already with a single segment can therefore be generated in the liquid core, a rotation of the liquid core around the strand axis.
    In the alternative case, however, that the number n of segments is greater than 1 and the traveling magnetic field generated by the coil arrangements of one of the segments in the first operating mode moves in the opposite direction to the traveling field generated by the coil arrangements of another of the segments in the first operating mode opposing control of the two segments can be achieved that adjusts a flow in the liquid core, which runs similar to the field lines of a magnetic dipole. Such an operation causes in particular a good mixing of the liquid core in the immediate region of the strand axis.
    In the alternative case, in which the number n of segments is greater than 1 and in the first operating mode the charging of the coil arrangements of one segment with their alternating currents occurs uncoordinated to the application of the coil arrangements of the other segment with their alternating currents, the control of the coil arrangements is simplified , For example, the coil arrangements of the various segments with different frequencies or arbitrary phase position relative to each other can be acted upon with their respective alternating currents. It is sufficient if the coil arrangements of each segment individually generate a traveling magnetic field. It is even possible, for example, always to operate one of the segments always the same and to change the mode of operation of the other segment from time to time, for example, to switch back and forth between the same direction and inverse generation of the magnetic traveling field.
    The segments are preferably each formed as a partial arc. In the event that the number n of segments is equal to 1, the segment preferably extends over an angle which is between 135 ° and 225 ° with respect to a center of the partial arc. The angle may in particular be between 150 ° and 210 °. By virtue of this configuration, although only a single segment is present, the liquid core of the metal strand can be efficiently rotated in rotation about the strand axis. Nevertheless, in particular, the segment can be made good at the metal strand and also removed from it. In the event that the number n of segments is greater than 1, the segments preferably extend over an angle, which is between 180 ° / n and 270 ° / n, with respect to a center of the respective partial arc, n is the Number of segments.
    The segments are preferably position-controlled by means of a respective drive device or can be adjusted in position-controlled manner to the metal strand. The drive devices can be designed in particular as electric drives or hydraulic cylinder units. It is possible that the hitching to the metal strand is a pivoting movement. However, the employment preferably takes place purely radially.
    Preferably, the stirring coil on a traversing device, by means of which the stirring coil is movable in the casting direction. As a result of this configuration, in particular the stirring coil can be moved and positioned as required along the metal strand.
    In many cases, the continuous casting is designed as a sheet system. In this case, the segments are preferably also bent viewed in the casting direction. As a result, the distance of the segment or segments from the metal strand can be minimized.
    The stirring coil according to the invention is particularly suitable for use when the metal strand has a strand cross-section which corresponds to a billet, a billet or a pre-profile. The billet here is a metal strand with a rectangular cross section with a side length of 80 x 80 mm up to 200 x 200 mm or a round cross section with a diameter between 80 and 200 mm. As a billet or Vorprofil a metal strand is designated with a rectangular cross-section with a side length of 150 x 150 mm and more or a round cross section with a diameter of 150 mm and more. Often, in the case of a rectangular cross section, the cross section is up to 350 x 350 mm, and in the case of a round cross section, it is also up to 350 mm. In individual cases, however, larger side lengths or diameters are possible - in rare cases up to 1000 mm or more. In principle, however, the stirring coil according to the invention is also applicable to another strand cross-section - in particular a polygonal cross section or a slab cross section.
    In a particularly preferred embodiment of the present invention, the coil assemblies each have a plurality of induction coils, which are arranged one above the other in the casting direction. In this case, the induction coils of the respective coil arrangement in the first operating mode are applied in phase with their respective alternating current. If the coil arrangements each have a plurality of induction coils arranged one above the other in the casting direction, however, it is possible that the stirring coil can be operated in addition to the first operating mode in a second operating mode. In this case, the induction coils of the respective coil arrangement are acted upon in the second operating mode relative to each other out of phase with their respective alternating current. As a result, for example, if necessary, a linear stirrer can be realized as needed, or even a stirrer can be realized which has a linear component and a rotational component. The operation in the first or in the second operating mode is of course carried out at different times.
    The object is further achieved by a continuous casting with the features of claim 8. According to the invention, a continuous casting plant of the type mentioned above is configured in that the stirring coil is designed according to the invention.
    The above-described characteristics, features and advantages of this invention, as well as the manner in which they are achieved, will become clearer and more clearly understood in connection with the following description of the embodiments, which will be described in more detail in conjunction with the drawings. 1 shows a continuous casting plant, FIG. 2 shows a section of the continuous casting plant of FIG. 1, FIG. 3 shows a section along a line III - III in FIG. 1, FIG. 4 shows the section from FIG. 3 with different casting formats of a metal strand, 10 shows a stirring coil and forces exerted by the stirring coil on a liquid core of a metal strand, FIG. 11 shows a resulting rotational movement of the liquid core of a metal strand, FIGS. 12 and 13 show possible embodiments of a segment, FIG. 14 shows a segment in a rolled-off view, FIGS. 15 and 16 Possible embodiments of two segments, FIGS 17 to 19 4 to 6 analogous representations in a stirring coil with two segments and FIG 2 0 a resulting rotational movement of the liquid core of a metal strand.
    According to FIG. 1, a continuous casting plant has a mold 1 and a strand guide 2. The strand guide 2 is arranged downstream of the mold 1. In the mold 1 liquid metal 3 is poured, which solidifies within the mold 1 to a strand shell 4 with a (still) liquid core 5. The metal 3 may be, in particular, steel. A metal strand 6 consisting of strand shell 4 and liquid core 5 is drawn off from the mold 1 in a casting direction x by means of the strand guide 2 and cooled intensively in the strand guide 2. The strand shell 4 is thereby getting thicker and thus correspondingly the liquid core 5 smaller and smaller until the metal strand 6 is completely solidified. The metal strand 6 preferably has a strand cross-section which corresponds to a billet, a billet or a pre-profile.
    The continuous casting plant could be designed as a vertical system. According to FIG 1, however, the continuous casting plant is designed as a sheet system. Due to the design as a sheet system, the casting direction x initially initially vertical, but gradually changes gradually until the casting direction x is horizontal. The casting direction x is therefore not a once statically determined direction, but refers locally along the cast metal strand 6 on the instantaneous direction of movement of the metal strand. 6
    The continuous casting plant furthermore has (at least) one stirring coil 7. The stirring coil 7 can be arranged in the region of the mold 1. This is shown in FIG 1 in solid lines. In this case, the stirring coil 7 is designed as a mold coil (MEMS = mold electromagnetic stirrer). Alternatively, the stirring coil 7, as shown in dashed lines in FIG. 1, may be arranged in the region of the strand guide 2. In this case, the stirring coil 7 is designed as a strand coil (SEMS = Strand electromagnetic stirrer) or as a final coil (FEMS = final electromagnetic stirrer). It is possible that the stirring coil 7 is arranged stationary in the casting direction x. Preferably, however, the stirring coil 7 has a displacement device 8 (see FIG. 2), by means of which the stirring coil 7 can be moved in the casting direction x. The mobility is indicated in FIG 1 by a designated double arrow.
    The stirring coil 7 has a number of segments 9 according to the further FIG. It is possible, and even preferred, for only a single segment 9 to be present. Therefore, embodiments of the stirring coil 7 will first be explained in connection with FIGS. 3 to 14, in which the stirring coil 7 has only a single segment 9. 3 shows a section orthogonal to the casting direction x. According to FIG. 3, the segment 9 surrounds the metal strand 6 over a partial circumference. It is therefore possible to drive the segment 9 by means of a drive device 10 position-controlled to the metal strand 6 zoom. As a result, the distance of the segment 9 from the metal strand 6 can be kept to a minimum. This is - see Figures 4 to 6 supplemental - regardless of the format or cross section of the metal strand 6. In particular, Figures 4 to 6 different casting formats, for example, 200, 500 and 650 mm in diameter. In all three cases, the segment 9 can be made almost optimally to the metal strand 6. In particular, the segment 9 is preferably formed as a partial arc. The segment 9 thus extends, based on a center M of the pitch circle arc, over an angle a. A minimum value for the angle α of 135 ° should not be undercut, in order to ensure an efficient stirring effect. In order to continue to ensure optimal Aufsteilbarkeit to the metal strand 6 for larger strand cross sections, a maximum value for the angle α of 225 ° should continue to be exceeded. The angle α is thus preferably in the range of about 180 ° ± 45 °, more preferably in the range of about 180 ° ± 30 °. The corresponding explanations apply not only to a round cross section of the metal strand 6, but also to a rectangular cross section of the metal strand 6, as shown in FIGS. 7 to 9.
    The segment 9 has, according to FIG. 3, a plurality of coil arrangements 11. Minimally, the segment 9 has three coil arrangements 11. However, more than three coil arrangements 11 may also be present, for example 4, 5, 6 or even more coil arrangements 11. The coil arrangements 11 follow one another sequentially in the sectional plane. The coil assemblies 11 are supplied with alternating currents II, 12, 13. The number of alternating currents II, 12, 13 is at least three. The number of three alternating currents II, 12, 13 is sufficient even if the segment 9 has more than three coil assemblies 11 and the number of coil assemblies 11 is not an integer multiple of 3. The alternating currents II, 12, 13 have a uniform frequency f. The frequency f is typically at the line frequency of 50 Hz or 60 Hz or less. It can for example be between 3 Hz and 20 Hz.
    The stirring coil 7 is (at least) operable in a first operating mode. In this mode of operation, the alternating currents II, 12, 13 are out of phase with each other. In the case of an n-phase supply, the phase offset of the alternating currents II, 12, 13 is 360 ° / n electrically. In particular, in the case of a three-phase supply, the phase offset of the alternating currents II, 12, 13 relative to each other is thus 120 ° electrical. The phase offset is therefore completely analogous to the case that a magnetic rotating field would be generated in the metal strand 6 by means of a stirring coil completely surrounding the metal strand 6. Due to the fact that the segment 9 only partially surrounds the metal strand 6, the magnetic field generated by means of the coil arrangements 11 is-analogous to an electric linear drive-a magnetic traveling field. The traveling direction of the magnetic traveling field is uniform within the segment 9. However, it runs - as it would be the case with a magnetic rotating field - in the cutting plane.
    Due to the asymmetrical effect of the traveling magnetic field on the metal strand 6, asymmetric forces also act on the liquid core 5. FIG. 10 shows by way of example a round metal strand 6 and a round, still liquid core 5 a distribution of the acting forces, which was determined on the basis of a mathematical modeling. However, despite the asymmetric action on the liquid core 5, as shown in FIG. 11, a nearly symmetrical rotation of the entire core 5 results. The center of rotation Z of the liquid core 5 lies slightly outside the center Z 'of the metal strand 6. However, this does not provide any Disadvantage, but tends to be an advantage, as well as a movement in the region of the center Z 'of the liquid core 5 takes place.
    It is possible that the segment 9 seen in the casting direction x has a relatively low height as shown in FIG 12. Alternatively, it is possible, as shown in FIG. 13, for the segment 9 to have a relatively large overall height in the casting direction x. In particular, in this case, the segment 9 is preferably adapted to the type of continuous casting. In particular, in this case the segment 9 is bent as seen in the casting direction x when the continuous casting plant is designed as a sheet-fed system. Of course, this is not necessary in the case of a vertical installation.
    It is possible that the coil assemblies 11 each have only a single induction coil 12. Alternatively, however, as shown in FIG. 14, it is equally possible that the coil arrangements 11 each have a plurality of induction coils 12. The induction coils 12 of the respective coil arrangement 11 are arranged one above the other in this case in the casting direction x. Seen over the entirety of the coil arrangements 11 of the segment 9, the induction coils 12 thus form a two-dimensional matrix.
    As already mentioned, the stirring coil 7 is operable at least in the first operating mode. If the coil arrangements 11 have a plurality of induction coils 12, the induction coils 12 of the respective coil arrangement 11 in the first operating mode are applied in phase with their respective alternating current II, 12, 13. In this case, there is a traveling direction of the traveling magnetic field corresponding to the arrows indicated by Bl in FIG. In the case of a plurality of induction coils 12 per coil arrangement 11, however, it is possible for the stirring coil 7 to be operable in (at least) a second operating mode in addition to the first operating mode. In the second operating mode, the induction coils 12 of the respective coil arrangement 11 are acted upon with their respective alternating current II, 12, 13 relative to one another in a phase-shifted manner.
    Thus, it is possible, for example, those induction coils 12 of the coil assemblies 11, which have seen in the casting direction x the same altitude, in the second mode of operation in phase with their respective alternating current II, 12, 13 to act. In this case, a traveling direction of the traveling magnetic field is given in accordance with the arrows indicated by B2 in FIG. As a result, the segment 9 thereby realizes a linear stirrer. It is even possible that in the second operating mode, both the induction coils 12 of the respective coil assembly 11 relative to each other out of phase with its respective alternating current II, 12, 13 are applied and the coil assemblies 11 are driven in phase relative to each other. In this case, a traveling direction of the traveling magnetic field results, for example, in accordance with the arrows labeled B3 in FIG. This corresponds to simultaneous stirring both around the center of rotation Z and in the casting direction x.
    In the following, embodiments of the stirring coil 7 will be explained in connection with FIGS. 15 to 19, in which the stirring coil 7 has at least one further segment 9 'in addition to the segment 9. The segments 9, 9 'can be as identical as possible. Also for the embodiments with a plurality of segments 9, 9 'apply the above in connection with the configuration of the stirring coil 7 with only a single segment 9 explained principles, namely - that the segments 9, 9' extending the metal strand 6 in a direction orthogonal to the casting x Seen sectional plane each surrounded over a partial circumference, - that the segments 9, 9 'each have a plurality of coil assemblies 11, 11', which follow each other sequentially in the sectional plane, - that the coil assemblies 11, 11 'of the segments 9, 9' with alternating currents II , 12, 13, II ', 12', 13 'are acted upon, - that in the first operating mode of the stirring coil 7, the alternating currents II, 12, 13, II', 12 ', 13' are out of phase with each other in such a way that the alternating currents II, 12, 13, II ', 12', 13 'of the coil assemblies 11, 11' of the respective segment 9, 9 'generate in the metal strand 6 a respective magnetic traveling field whose traveling direction is in the sectional plane, - d the segments 9, 9 'can preferably be adjusted to the metal strand 6 by means of a respective drive device 10, 10' and - that the segments 9, 9 'are preferably bent in the casting direction x, if the continuous casting plant is designed as a sheet system.
    Below, therefore, only the differences and the additional possibilities are explained in more detail, resulting from the use of multiple segments 9, 9 '.
    Thus, as explained above, the segments 9, 9 'are likewise preferably each designed as a partial arc. In the case of several segments 9, 9 ', however, the segments 9, 9' extend, with respect to the respective center Μ, M 'of the respective circular arc, over angles a, a', which lie between 180 ° / n and 270 ° / n where n is the number of segments 9, 9 '.
    Furthermore, in the case of a plurality of segments 9, 9 ', the coil arrangements 11, 11' can each have a plurality of induction coils 12, 12 ', which are arranged one above the other in the casting direction x. In this case, the same operating modes are still possible with respect to the further segment 9 ', which have been explained above for the segment 9.
    Above all, however, the use of a plurality of segments 9, 9 'results in extended possibilities for generating the magnetic fields, by means of which the stirring effect is achieved.
    In the simplest case, it is possible to make a similar and coordinated loading of the coil assemblies 11, 11 'with their alternating currents II, 12, 13, II', 12 ', 13'. In this case, there is an almost identical action as in a completely closed, the metal strand 6 surrounding stirring coil. In addition, however, it is already possible in the first operating mode to make various variations.
    For example, it is possible to individually determine the frequency f, f 'of the alternating currents II, 12, 13, II', 12 ', 13' for the respective segment 9, 9 '. For example, the one frequency f at 5 Hz, the other frequency f 'at 8 Hz. Within the respective segment 9, 9', the respective frequency f, f 'but uniform. Thus, the phase offset of the coil arrangements 11, 11 'relative to each other and - as far as given - the phase offset of the induction coils 12, 12' relative to each other for the respective segment 9, 9 'to the respective frequency f, f'.
    Alternatively or additionally, it is possible that the magnetic traveling field generated by the coil arrangements 11 of one segment 9 migrates in the opposite direction to the traveling field generated by the coil arrangements 11 'of the other segment 9'. This results in a stirring effect, as shown schematically in FIG. In particular, the central region of the liquid core 5 is thereby well stirred.
    Alternatively or additionally, it is possible that the loading of the coil assemblies 11 of the one segment 9 with its alternating currents II, 12, 13 uncoordinated to the loading of the coil assemblies 11 'of the other segment 9' with their alternating currents II ', 12', 13 ' , This applies on the one hand to the already mentioned case of the application of alternating currents II, 12, 13, II ', 12', 13 'of different frequencies f, f'. But also the amplitudes of the alternating currents II, 12, 13, II ', 12', 13 'and possibly also the phase positions of the alternating currents II, 12, 13 of the coil assemblies 11 of a segment 9 relative to the alternating currents II', 12 ', 13th 'The coil assemblies 11' of the other segment 9 'can be set uncoordinated.
    It is even possible to establish a chronological sequence of the operating modes to which the segments 9, 9 'are respectively operated. For example, first both segments 9, 9 'coordinated cause a clockwise stirring, then the segment 9' can be switched to a counterclockwise stirring, then additionally the segment 9 can be switched to a counterclockwise stirring and finally the segment 9 'are switched to a clockwise stirring. After that, the sequence can start anew. Of course, other sequences are possible.
    In an analogous manner, in the case that the segments 9, 9 'have coil arrangements 11, 11', each with a plurality of induction coils 12, 12 ', which are arranged one above the other in the casting direction x, a rectified or an opposite operation of the induction coils 12, 12 'the coil assemblies 11, 11' of the two segments 9, 9 'possible. It is even possible to operate one of the two segments 9, 9 'in the first operating mode and to operate the other segment 9', 9 in the second operating mode. It is also possible to change the operating mode of the two segments 9, 9 'from time to time.
    In summary, the present invention thus relates to the following facts:
    An agitating coil 7 for a continuous casting plant has a number of segments 9, 9 ', which surround the metal strand 6 in each case over a partial circumference. The segments 9, 9 'each have a plurality of coil arrangements 11, 11' around the metal strand 6. The coil arrangements 11, 11 'of the segments 9, 9' are supplied with alternating currents II, 12, 13, II ', 12', 13 'which, based on the respective segment 9, 9', have a uniform frequency f, f '. exhibit. The alternating currents II, 12, 13, II ', 12', 13 'are out of phase with each other in such a way that they generate in the metal strand 6 a respective magnetic traveling field whose respective traveling direction is uniform within the respective segment and extends in the cutting plane. The number of segments 9, 9 'can be equal to 1. Alternatively, the traveling magnetic field generated by the coil arrangements 11, 11 'of one of the segments 9, 9' moves in opposite directions to the traveling field generated by the coil arrangements 11, 11 'of another of the segments 9, 9' and / or the coil arrangements 11 of FIG a segment 9 with its alternating currents II, 12, 13 uncoordinated to the loading of the coil assemblies 11 'of the other segment 9' with their alternating currents II ', 12', 13 '.
    The present invention has many advantages. When using only the segment 9 results in a compact, flexible construction of the stirring coil 7, which allows almost independent of the casting format in an efficient manner, a stirring around the strand axis around. Furthermore, the construction of the stirring coil 7 is simple and the stirring coil 7 is flexible and can be adjusted to the metal strand 6 in a simple manner. If the coil arrangements 11 of the segment 9 each have a plurality of induction coils 12 which are arranged one above the other in the casting direction x, the result is a very flexible operation of the stirring coil 7. When using a plurality of segments 9, 9 'additional variations in stirring can be effected, in particular alternatively a co-directional and an opposing stirring.
    Although the invention has been further illustrated and described in detail by the preferred embodiment, the invention is not limited by the disclosed examples, and other variations can be derived therefrom by those skilled in the art without departing from the scope of the invention.
    DESCRIPTION OF SYMBOLS 1 mold 2 strand guide 3 liquid metal 4 strand shell 5 liquid core 6 metal strand 7 stirring coil 8 displacement device 9, 9 'segments 10, 10' drive devices 11, 11 'coil arrangements 12, 12' induction coils A double arrow
    Bl, B2, B3 arrows f, f 'frequencies II, 12, 13 alternating currents II', 12 ', 13' alternating currents Μ, M 'centers x casting direction Z, Z' centers a, a 'angle
    权利要求:
    Claims (8)
    [1]
    claims
    1. Rührspule for a continuous casting plant, by means of which in a casting direction (x) a metal strand (6) is poured, - wherein the stirring coil has a number n of segments (9, 9 '), the metal strand (6) in an orthogonal to The segments (9, 9 ') in each case have a plurality of coil arrangements (11, 11') which, viewed in the sectional plane, follow one another sequentially, - the coil arrangements (11, 11 ') of the segments (9, 9') in operation with alternating currents (II, 12, 13, II ', 12', 13 ') are acted upon, - wherein the alternating currents (II, 12, 13, II', 12 ', 13 '), based on the respective segment (9, 9'), have a uniform frequency (f, f '), - wherein in a first operating mode of the stirring coil the alternating currents (II, 12, 13, II', 12 ', 13 '), relative to the respective uniform frequency (f, f'), are so out of phase with one another that the alternating currents (II, 12, 13, II ', 12', 13 ') of the coil arrangements (11, 11') of the respective segment (9, 9 ') in the metal strand (6) generate a respective magnetic traveling field whose respective direction of travel within the respective segment (9, 9'). ) is uniform and extends in the sectional plane, and - wherein the number n of segments (9, 9 ') is η = 1 or the number n of segments (9, 9') is η> 1, - where for η> 1 the magnetic traveling field generated by the coil arrangements (11, 11 ') of one of the segments (9, 9') in the first operating mode in the opposite direction to that of the coil arrangements (11, 11 ') of another of the segments (9, 9') in the first operating mode generated traveling field migrates and / or in the first operating mode, the loading of the coil assemblies (11) of one segment (9) with their alternating currents (II, 12, 13) uncoordinated to the loading of the coil assemblies (11 ') of the other segment (9') their alternating currents (II ', 12', 13 ') takes place.
    [2]
    2. Rührspule according to claim 1, characterized in that - the segments (9, 9 ') are each formed as a partial arc, - that in the case that the number n of segments (9, 9') is equal to 1, the segment (9) extends over an angle (a), which lies between 135 ° and 225 °, in particular between 150 ° and 210 °, relative to a midpoint (M) of the partial arc, and - that in the case that the number n is greater than 1 at segments (9, 9 '), the segments (9, 9') extend, with respect to a center point (Μ, M ') of the respective arc of a circle, over an angle (a, a') between 180 ° / n and 270 ° / n.
    [3]
    3. stirring coil according to claim 1 or 2, characterized in that a distance between a segment (9, 9 ') and the metal strand (6) by means of a drive means (10, 10') controlled or regulated is adjustable.
    [4]
    4. Rührspule according to claim 1, 2 or 3, characterized in that the stirring coil has a traversing device (8), by means of which the stirring coil in the casting direction (x) is movable.
    [5]
    5. stirring coil according to one of the above claims, characterized in that the continuous casting is formed as a sheet system and that the segments (9, 9 ') in the casting direction (x) are bent.
    [6]
    6. stirring coil according to one of the above claims, characterized in that the metal strand (6) has a strand cross-section which corresponds to a billet, a billet or a pre-profile.
    [7]
    7. stirring coil according to one of the above claims, characterized in that the coil assemblies (11, 11 ') each have a plurality of induction coils (12, 12') which are arranged one above the other in the casting direction (x) that the induction coils (12, 12 ') of the respective coil arrangement (11, 11') in the first operating mode in phase with their respective alternating current (II, 12, 13, II ', 12', 13 ') are acted upon and that the stirring coil in addition to the first operating mode in a second operating mode operable is, in which the induction coils (12, 12 ') of the respective coil assembly (11, 11') relative to each other out of phase with their respective alternating current (II, 12, 13, II ', 12', 13 ') are acted upon.
    [8]
    8. Continuous casting plant, - wherein the continuous casting a Kokille (1) and one of the mold (1) downstream strand guide (2), - wherein the continuous casting further comprises a stirring coil (7) according to one of the above claims, in the region of the mold ( 1) and / or the strand guide (2) is arranged.
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    同族专利:
    公开号 | 公开日
    WO2017162418A1|2017-09-28|
    EP3433038A1|2019-01-30|
    EP3433038B1|2019-11-27|
    AT518460B1|2021-07-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EP0013441A1|1979-01-05|1980-07-23|Concast Holding Ag|Apparatus and method for electromagnetical stirring in a continuous steel casting plant|
    EP0028761A1|1979-11-06|1981-05-20|Asea Ab|Method of stirring during continuous casting|
    EP0145699A1|1983-11-04|1985-06-19|VOEST-ALPINE INDUSTRIEANLAGENBAU GESELLSCHAFT m.b.H.|Stirring device in a continuous casting plant|
    US4834168A|1987-04-13|1989-05-30|Alsthom|Device for electromagnetically stirring liquid metal on a continuous casting line|
    WO2007073863A1|2005-12-24|2007-07-05|Concast Ag|Method and device for the continuous casting of preliminary steel sections, in particular preliminary double-t sections|
    EP2127783A1|2008-05-30|2009-12-02|Abb Ab|A continuous casting device|
    WO2013174512A2|2012-05-24|2013-11-28|Ergolines Lab S.R.L.|Electromagnetic stirring device|
    JPH07108355A|1993-10-08|1995-04-25|Kobe Steel Ltd|Electromagnetic stirrer|
    US7828043B2|2007-10-09|2010-11-09|Gm Global Technology Operations, Inc.|Non-invasive real-time level sensing and feedback system for the precision sand casting process|
    CN201405047Y|2009-04-10|2010-02-17|湖南中科电气股份有限公司|C-shaped freezing end-point magnetic stirrer|CN108515153B|2018-05-03|2020-02-04|燕山大学|Composite magnetic field spiral electromagnetic stirring device|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50230/2016A|AT518460B1|2016-03-21|2016-03-21|Stirring coil partially encompassing a metal strand|ATA50230/2016A| AT518460B1|2016-03-21|2016-03-21|Stirring coil partially encompassing a metal strand|
    PCT/EP2017/054961| WO2017162418A1|2016-03-21|2017-03-02|Stirring coil which partly surrounds a metal strand|
    EP17708498.5A| EP3433038B1|2016-03-21|2017-03-02|Stirring coil which partly surrounds a metal strand|
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