JP5874945B2 - Stirring roll for continuous casting machine of metal products with wide cross section - Google Patents

Description

  The present invention relates to liquid metal that is still molten inside a wide cross-section metal product, such as a steel slab, downstream of the ingot mold in the secondary cooling zone of the continuous casting facility in which it is produced. The present invention relates to a sliding magnetic field type electromagnetic device for moving in the solidification process.

  More precisely, the present invention relates to the production of this type of equipment, in this case commonly referred to as “stirring rolls”, which are cylindrically shaped in order to be integral with the supporting and guiding rolls of the cast slab. Yes.

  The electromagnetic part of such equipment conventionally comprises a multiphase linear inductor that is oriented perpendicular to the surface of the roll shroud surrounding the roll and generates a moving magnetic field that slides along the axis of rotation of the roll. Is noticed.

  For a slab continuous casting, a brief historical description of this technology, which is widely used worldwide in today's steelmaking technology, will outline three eras.

  The first era that began was published in December 1973, FR 2187467, which describes a multiphase central linear inductor mounted coaxially with a surrounding non-magnetic steel sleeve. Indicated by the calligraphy. Thus, an agitating roll as an active element has been born that can replace the existing support roll and guide solid roll in the casting machine. Already here two basic versions are shown: an inductor that rotates with a roll wrap (sleeve) that contacts one of the large surfaces of the cast slab, or a fixed inductor.

  The second era is that of French Patent Application No. 2301325, published in August 1976, which provides support for the sleeve while rotating the sleeve and the sleeve freely along its axis. Describes the basic concept of the technology of a stirring roll with a rotating inductor, which is made on the basis of a mechanical coupling device ensuring the above. Here, these devices are formed by frusto-conical cylindrical shafts with each side of the sleeve attached to the end of the sleeve, offset from the center beyond the sleeve, and the chassis of the casting machine It consists schematically of the whole formed by a rolling bearing attached to a support element fixed to the shaft, in which the small base of the shaft neck rotates about the shaft in this bearing. The central inductor itself is maintained and centered at the support inside the large base of each axle. At least one of the shaft necks (which can be removed to allow installation of the inductor in the sleeve) has its support bearings to allow electrical connection of the inductor to an external multiphase power source Sticks out.

  The third era is that of European Patent Application Publication No. 0043315 published in January 1982. This document details the practical product that is still used today, here achieved by a stirring roll with a fixed inductor. That is, the same overall structure is found again here as that of the rotating inductor, but here the central inductor is maintained by a unique internal structure on which the phase electrical coils are wound. This structure forms an axis along the axis for this purpose, but its narrowed end extension is inserted into the rolling bearing that supports the sleeve so that the small base of the sleeve neck It is attached to the outer surface of these bearings and is fixed to the machine chassis via wedged side plates that prevent the inductor from rotating along its axis.

  This side plate, in another aspect, separates the inductor from the sleeve, the bottom of the watertight water box with water inlet / outlet for cooling the sleeve and the inductor by circulation in a defined annular space. Configure. The water box also serves as an electrical connection panel and has electrical terminals on the outside that connect the inductor to an external power source.

In general, and as shown by the right-hand portion of FIG. 1 of the accompanying drawings, this known technique of a stirring roll is essentially characterized by the cooperation of two coaxial sub-elements, the two coaxial sub-elements being One is an element that freely rotates along the axis and the other is a fixed element, both of which are supported by a support 4 of the sleeve 7 that is fixed to the chassis 5 of the casting machine. It is supported. That is,
The first element is immobile in rotation along the axis and is formed by a central inductor 8, the central inductor having its end extension 12 above the centering stand 14 The centering stand prevents the first element from rotating along its axis and is connected to the chassis 5 of the casting machine via a support element 4. Is what is being
The second element is formed by a sleeve 1 which is movable in rotation along the axis and is in rotational contact with the cast slab 6 and its two cylindrical shaft necks 2; Wherein the shaft neck extends in its sleeve at each of its ends and is attached to a support element 4 which is fixed to the machine chassis 5 in an off-centered rolling bearing 3 The small base 13 rotates about the axis.

  For convenience, the water box 16, which also serves as the inductor electrical connection panel 18, is watertight and covers the mount 14 from the outside.

  This type of stirrer roll has been shown to be perfectly adapted to its dual function of support and stirrer and is commonly used in most standard width slab continuous casters. However, the standard width is about 1600 to 1700 mm, and the sleeve supported by the two bearings at the end is sufficiently stiff without changing so as not to cause a critical defect. It is a width.

  This type of agitating roll can also be used for very wide slabs, i.e. over 2400 mm, with the installation of two half-rolls and intermediate rolling bearings at this time. Even under the thermomechanical stress imposed by contact with the substrate, its rigidity and its geometrical straight line are ensured (WO 2011/117479).

  On the other hand, it is clear that this technique is not applicable to slabs with intermediate widths, for example slabs with a width of 2000 mm to +/− 20% (ie 1600 to 2400 mm). To consider a solution with two half-rolls with intermediate bearings, the active part of the inductor is too short due to the presence of the end shaft neck, and with a single-roll solution without intermediate bearings The point where the load is applied to the chassis of the casting machine separates the presence of the end shaft and greatly exceeds the simple distance required to cover its full width of the slab, causing a deflection that is a fatal defect. It will surely occur. As an example, a 240 mm diameter stirring roll attached about 3 m below the cast metal position of an ingot mold in a “standard” caster with a width of 1600 mm is subjected to the slab's molten iron static pressure. While a deflection of less than 1 mm is obtained, on a machine with a width of 2000 mm, the deflection can be approximately 4 mm, which is a fatal defect.

  In light of this situation, and while maintaining the overall functional and practical quality of a normal stirrer roll, the present invention proposes a technical concept for a stirrer roll without end necks to increase the stiffness of the sleeve. The purchase and operating costs make it possible to make the product more economical and also meet all requirements in terms of slab widths of 1600mm (or smaller) to 2400mm (and larger) The purpose is to.

Therefore, the present invention is directed to a stirring roll for a continuous casting machine of a metal product having a wide cross section such as a slab,
-(A) at least one outer sleeve of non-magnetic steel that rotates along an axis to come into contact with the surface of the large face of the cast slab;
-(B) a mechanical coupling device ensuring the support of the sleeve while freely rotating the sleeve along the axis;
-(C) a support element for the stirrer roll that is offset from the center on both sides beyond the sleeve and is fixed to the chassis of the casting machine;
-(D) an internal electromagnetic device composed of at least one sliding magnetic field type multiphase linear inductor, which is mounted coaxially with the sleeve and provides an annular space between which the cooling liquid circulates. The device corresponds to an axis along the axis, with a hollow end extension, which loads the support element and prevents it from rotating along the axis, and- (E) a cooling liquid inlet / outlet case comprising electrical connection terminals and attached to the end of the terminal extension of the inductor beyond the support element;
Including
The agitation rolls load the end extension of the inductor via the mechanical coupling device comprising a rolling bearing in which the sleeve is placed between the sleeve and the end extension (preferably the end of the sleeve). It is characterized by pouring.

  As will be appreciated, the underlying idea of the present invention is to give the inductor the support function of a sleeve that rotates a little around the inductor. To that end, the rolling bearings of the sleeve, or more generally its mechanical coupling device which freely rotates the sleeve along its axis, is distinct from those conventional support elements which are connected to the structure of the casting machine. Is done. Thus, the rolling bearings required to support a sleeve that freely rotates along an axis, so that a conventional support element receives only the end extensions of the inductor, since then, these end extensions of the inductor. It becomes a simple rolling bearing attached to the part.

  The main advantage that is unique to the technology of the stirring roll according to the present invention, and will be described in more detail later, is to eliminate the “tilt” phenomenon of the rolling bearing in the bearing due to the absence of the bearing, Any significant reduction could already be taken into account.

  On the other hand, the technical concept according to the invention is particularly attractive for the simplified structure of very long stirring rolls for casters of wide slabs (over 1600 mm), as already emphasized. The trend is open to the world, and this trend is being further encouraged by steelworks that are constantly demanding improved productivity, and is even more recognized worldwide in ironmaking.

  That is, it is known that a single long cylindrical roll may receive a deflection that becomes a fatal defect by receiving the molten iron's static pressure applied to the cylindrical roll. Therefore, in order to propose a solution to this problem according to another embodiment of the present invention, which is advantageously applicable to the casting of wide slabs, such a very long stirring roll (below “ The so-called split-type agitation roll) actually comprises two, but no longer one, sleeves arranged in completely different rows. These two sleeves are preferably of the same length and are provided with two additional intermediate rolling bearings that load the central intermediate extension of the structure along the axis of the inductor. This intermediate extension itself is supported by a supplementary central support fixed to the chassis of the caster.

  It will be noted that the unique advantage of this variant is the compactness of the central bearing zone of the split stirring roll, which is impossible to achieve with the end neck And inevitably leads to a broader and thus better mechanical support of the cast slab in the central region of the large face of the cast slab.

  Another advantage of the split stirring roll is in the practical dimension. In the case of a very wide slab, for example over 2000 mm, one central support fixed to the machine chassis with two inductors on the same structure along the axis of the inductor inside the same stirring roll Could be combined independently of each other electrically and magnetically.

  In all its embodiments, compared to known conventional agitation rolls, the agitation roll according to the present invention has a non-rotating fixed shaft as indicated by the end extension of the inductor, with the end rolling bearings and shaft neck removed. It is represented by the fact that it is replaced by a simple support and the fact that the sleeve rotates around this fixed shaft while applying a load on the fixed shaft via a rolling bearing that supports the sleeve. .

  This arrangement leads to a significant reduction in the distance separating the stationary support from the stirring roll, and thus a relative reduction in the deflection that the sleeve obtains during operation, thus leading to a reduction and even elimination of the tilt phenomenon.

  Moreover, the force that the sleeve conveys to the coupling device is no longer transmitted by the shaft neck, which is necessarily cylindrical and therefore deformable, and can determine the desired dimensions so that any deformation is avoided. Can be added directly to the central axis. In another aspect, this arrangement, which is transferred to an intermediate rolling bearing in a split-stirring roll version, ensures a minimum dimension between the two sleeves, i.e. maximized slab support continuity over the slab width. .

  The invention will be better understood and other aspects and advantages will become more apparent from the following description of an embodiment of a stirring roll according to the invention with reference to the accompanying drawing figures.

In order to facilitate comparison with the prior art, it is an instructional view with a cross-sectional view along the axis of a deliberately mixed stirring roll, in that sense, the left end (on the drawing) is according to the present invention It is realized using technology, while its right end is that shown in its usual embodiment known in the art. FIG. 6 is a cross-sectional view along the axis of the agitation roll in a version of the agitation roll based on a single sleeve (ie without a central support). FIG. 6 is a cross-sectional view along the axis of an alternative embodiment, called a “split stirrer roll”, having two sleeves and a central support.

  First, referring to the right part of FIG. 1 for reference, it can be seen that a conventional stirring roll is mainly formed of a long and elongated cylindrical body that rotates about its AA symmetrical main axis. This cylindrical body consists of a non-magnetic stainless steel cover, i.e., a sleeve 1 and a frustoconical shaft neck 2 that holds the sleeve at its two ends, and a small base 2a of each shaft neck is used for a continuous casting machine. It is fitted in a rolling bearing 3 ′ that is incorporated in a support 4 that is connected to a rigid chassis 5.

  With this casting machine, it is possible to cast a metal slab 6 that travels from an ingot mold at a high position to a length cutting machine below the machine. At the same time, the complete solidification of the molten metal is influenced by the intense cooling of its surface by contact with the inner wall of the ingot mold, and then from the surface of the product 6 to be cast, then the secondary cooling stage of the caster More precisely, it is done gradually by direct spraying of water in a place equipped with a mechanical stirring roll.

  That is, the casting slab is rotated at this location by a rotating support roll that is pressed against and contacts each of the large surfaces of the slab, such as the large surface 7 on the drawing, which is constantly updated during the rotation by the generator. It is maintained and guided while moving slowly downwards.

  As can be seen, the space that can be used inside the sleeve 1 is almost entirely due to the electromagnetic inductor 8 intended to allow the molten metal to still move inside the slab 6 in a controlled manner. Occupied. For this purpose, the multiphase linear type inductor 8 is capable of generating a magnetic field that is directed generally perpendicular to the large face of the slab 6 so that the windings of the windings 10 of the phase that follows along the inductor can be generated. It has a magnetic frame 9 that acts as a mounting support, but the magnetic field is movable when the winding 10 is correctly connected to the terminals of an external multiphase power supply (two-phase or three-phase) not shown, ie an inductor It slides along the A-A axis.

  The inductor 8 itself is also axisymmetric about its longitudinal axis, which is united with the AA axis of the sleeve 1 so that it can be accurately centered on the sleeve, and the stirring during operation. An annular space 11 for the cooling liquid that ensures the temperature maintenance of the roll is provided between them. Centering along this axis is achieved by the cylindrical end extension 12 of the inductor, which end extension is supported by the support 13 in a functional mere in the small base 2a of the shaft neck 2. In order to be able to fit in the gap and to be able to protrude from the range of the shaft neck beyond the bearing 3, the support part is provided with the necessary wedge. At the end plate 14, it acts as a wedge to prevent the inductor from rotating along the axis. Each end extension 12 is hollow (pipe 24 along the axis) and includes a radial tube 15 that communicates with the annular space 11 and is watertightly attached to the end of the end plate 14 and cooled. It leads into a water box 16 equipped with a water inlet or outlet pipe 17 (in this figure an outlet pipe).

  It can be seen that the water box 16 also serves as a panel for the connection terminal 18 of the inductor 8 to the external multi-phase power source, but the inductor coupling wire 19 is connected to the terminal 18 to reach the axis of its extension 12. Pass through the hole along.

  Referring now to either the left side of FIG. 2 or FIG. 1, the agitation roll according to the present invention (components identical to those of the known agitation rolls discussed above are indicated by the same reference numerals). However, since the rolling bearing 3 ′ and the shaft neck at each end of the roll are removed, it can be seen that this differs from the known prior art. Due to this peculiarity, there is a place in the end extension 20 of the inductor 8 where a load is laid down and the rotation is prevented by the wedge 31 in the frame formed by the fixed support 4 at that time. Can be surrendered.

  As is visible, but not necessary, this extension 20 has a diameter greater than that of extension 12 (the right side of the figure), similar to a conventional stirring roll, with a greater thickness. This is because the extension will be able to apply more external force at this point, so that it will further increase its mechanical strength if necessary, which is now understood It will be.

  That is, on the one hand, the rolling bearing 3 replaces the shaft neck at the end of the sleeve 1 (ie that which has been removed) with only rolling bearings in their function of maintaining and rotating the sleeve, and on the other hand these rolling bearings. The bearing 3 is loaded directly on the end extension 20 of the inductor, which thus serves as a support for the sleeve 1.

  It is noted that by removing the end neck, the distance between the fixed supports 4 is 25-40 cm, or approximately 20% shorter than the length of the stirring roll, depending on the case, compared to known techniques. Should.

  The rolling bearing 3 will thus be fixed at each end of the sleeve. This fixing can be ensured in a manner known per se by means of a bolted crown gear, not shown in the drawing, to avoid wasting too much in the drawing. Similarly, the rolling bearings 3 are attached to the ends of the sleeves to serve as lubrication plates and cover these rolling bearings to protect them from dust and to improve overall water tightness. It would be better to prepare the annular side surface 32.

  However, as already mentioned in the beginning, in order to facilitate the installation of the inductor 8 inside the sleeve 1 in the workplace, a rolling bearing cage with a mechanical design that can be opened is used. It would be better to choose at least one of the two ends, otherwise two.

  FIG. 3 shows a variant of the technique according to the invention applied when the stirring roll is no longer a single sleeve extending across the entire width of the cast slab, but two half-sleeves 1a and 1b.

  These two half-sleeves of a common line are supported by intermediate rolling bearings 3c and 3d at their close ends and a short distance provided by the presence of an intermediate extension 20c of the inductor between the two half-sleeves ( For example, 10 cm to 20 cm). The intermediate rolling bearings 3c and 3d load the intermediate extension 20c of the inductor so that the end rolling bearings 3a and 3b load the terminal extension 20a / 20b of the inductor, the intermediate extension being Thus, there is no electrical winding and a load is applied to the central support 21 which is fixed to the chassis 5 of the casting machine.

  As already mentioned, such a stirring roll has come to be called “split” for reasons that are clearly derived from what has been said above, and was actually marked 1a and 1b. Formed with two half-sleeves, but easily exceeds the limit of 1.6 / 1.7m conventional stirring rolls and even 2.4m wide, and this split roll is a central support 21 is a solution that makes it possible to continuously cast increasingly wider slabs, which will probably be even more in the near future, because they are protected against deflections that are fatal defects, in any case steelmaking It constitutes an appropriate answer to the growing demand in the world of technology.

The end extension 20a or 20b of the inductor, located at the end of the roll,
-On the one hand, water-tight water with a free water inlet pipe 17a or outlet pipe 17b and whose terminal 18a or 18b panel forms one of the walls (front wall in the figure). In box 16a or 16b,
-On the other hand, in the annular space 11a or 11b provided between each half-sleeve 1a or 1b and the inductor 8 via a perforated radial tube 15a or 15b,
It is hollow so that it can be communicated.

  The intermediate extension 20c is also hollow and is provided with perforated radial tubes 15c, 15d to form a watertight central tube for communication between the two annular spaces 11a and 11b.

The cooling of the half-sleeves 1a and 1b and the inductor 8 is thus carried out by means of a common water circulation path having the following components, which are determined in the order corresponding to the cooling liquid circulation direction from left to right in FIG. Ensured:
A water supply box 16a, in which cooling water enters through a conduit 17a connected to a source of pressurized water not shown,
A passage 24a along the axis of the left outer end extension 20a on the left side of the inductor 8 and its radial tube 15a leading to the end of the annular space 11a,
Ensuring the circulation of water in the vicinity of the half-sleeve 1a so that the half-sleeve can be cooled during and after the contact between the hot slab 6 and the half-sleeve, and the left part of the inductor 8 is cooled; The annular space 11a provided between the half sleeve 1a and the concentric inductor 8 so that it can
The perforated radial tube 15c of the intermediate intermediate extension 20c, the axial passage 26, and the perforated radial tube 15d, which connect the annular space 11a with the space 11b;
-Ensuring the circulation of water near the periphery of the half sleeve 1b, so that the half sleeve can be cooled during and after the contact between the hot slab 6 and the half sleeve, and the right part of the inductor 8 is cooled; The annular space 11b provided between the half sleeve 1b and the inductor 8 so that it can
A perforated radial tube 15b and an axial passage 24b in the outer extension 20b on the right side of the inductor leading into the drain box 16b;
-And a drain box 16b with an outlet pipe 17b for returning cooling water to the loop.

  The inductor intermediate extension 20c naturally separates the electrical winding 10 at this location, but the mechanical continuity between the left and right portions of the inductor is made of steel or inductor. This extension is ensured by the same material as the structure along the axis.

  According to one embodiment of the present invention shown in FIG. 3, this split stirring roll comprises two completely different electromagnetic inductors, one in the left half sleeve 1a, one in each half sleeve. It is possible to have the inductor 8b in the inductor 8a and the right half sleeve 1b. Here, inductors 8a and 8b that are identical to each other are shown according to a preferred variant of the invention, but are similar to the single inductor 8 of FIG. 1 or FIG.

  These inductors can be mechanically connected by an intermediate extension 20c, or can be disconnected and joined at the central support 21, for example to facilitate assembly. In that regard, as shown in the figure, a simple “male-female” type fit would be sufficient to ensure the mechanical coupling of the two inductors.

  However, it was understood that when there is one central support, such a mechanical connection between the two inductors 8a and 8b is only necessary to connect on the central support 21. That would be true. Thus, the choice of each inductor having its own central support at its inner end can be greatly considered conversely. Thus, in such a case, the two central supports are juxtaposed to each other and are each supported by the chassis of the casting machine. In this case, however, it would be necessary to provide a flexible but watertight joint between these two inductors that are combined to allow circulation of the cooling water.

  Another aspect may indicate the disadvantages of this variation, but the gap between the two half-sleeves may be relatively large, and this gap also causes a “dead” zone at the intermediate bearing. The width portion of the cast slab 6 that does not receive any mechanical support and is not cooled is also likely to be larger. However, it may be possible to mitigate the undesirable effects caused on the slab by preparing an assortment of different but different length half-sleeves for the same roll. In that way, in accordance with the already very well-known principle, the casting is carried out on a roll-by-roll basis at the height of the casting machine in order to aim for a uniform overall turbulence after several meters in the casting direction of the slab. The “dead” zone of the slab width will be shifted.

  However, it was understood that whatever the variant embodiment adopted for the area of the central support 21, a stirrer roll consisting of two half rolls of two distinct inductors 8a and 8b is used. However, the two distinct inductors are those that generate a sliding magnetic field, which is suitable for being able to power two power supplies, or each inductor separately. With only one power supply, both the power and the direction of sliding along the inductor axis can be adjusted independently of each other. To that end, preferably for practical reasons, a given inductor 8a or 8b will preferably be assigned a panel of the respective electrical connection terminals 18a and 18b closest to it.

  For clarity of explanation, since the inductors 8a and 8b are multiphase (three-phase or more usually two-phase) linear types, each of the inductors has the same number of phases as its power supply. It is probably desirable to remind now that two connection terminal pairs are required, ie two pairs in the case of two phases, and three pairs of connection terminals in the case of three phases. Note that in the case of the child electrical wiring, the number of terminals will be three for two phases and three for three phases).

  This type of inductor generates a magnetic field whose field lines are generally directed perpendicular to the AA longitudinal axis of the inductor, but the magnetic field is also movable, because the magnetic field is moved along this axis. This is because it can be slid in a certain direction, or can be slid in the opposite direction only by reversing the phase of the power source. Thus, it can be seen that if there are two power supplies, or a power supply that can be divided in the same way, the sliding magnetic fields on the two inductors 8a and 8b of the same stirring roll can be adjusted independently of each other. However, this opens up particularly interesting possibilities for the means of moving the molten metal inside the slab during casting.

  It will be noted that such a split stirring roll having two completely different inductors is visually indistinguishable from a stirring roll having a single inductor. Simply, each inductor must have a complete set of windings that can generate a sliding magnetic field (four for a minimum of two-phase inductors and six for a three-phase inductor). One), a single inductor may allow the set of windings to be spread throughout the left and right parts, thereby increasing the number of pole pairs, for example for one phase. it can.

  Also, the inductor winding connections to the power supply phase will preferably all be directed towards the same electrical connection panel at one end of the roll, and the other inductor connection is Will be directed all the way to another connection panel attached to the other end (where connection 18a is towards the nearest panel 19a and connection 18b is towards panel 19b), while With a single inductor, half of the connections can be grouped on the left and the other half can be grouped on the right.

  In the case of a split-type stirring roll having a single inductor (FIG. 2) and in the case of a split-type stirring roll having two distinct inductors (FIG. 3), the intermediate extension 20c of the inductor is It will be appreciated that there is no need to prepare the connection via, otherwise it may complicate the conception and installation of the facility.

  The agitating roll according to the invention can be incorporated without particular difficulty into the part of the casting machine structure which, in its embodiment without the central support 21, has another usual roll for supporting and guiding the slab. This is also true for the split stirring rolls according to the invention, since the usual support rolls also have intermediate bearings or intermediate supports in the case of wide machines, This is because the structure of the part has already been envisaged with a chassis for the central support.

  From this observation, a single sleeve, non-split, i.e., stirrer roll without a central support, according to one embodiment of the present invention, should rather be devoted to casting slabs up to conventional widths, i.e. approximately 1650 mm. Would have been understood. Alternatively, a split stirrer roll with two half sleeves and a central support may be selected, although the split stirrer roll is also used for casting normal width slabs as well. It is emphasized, however, that there are no disadvantages.

  As a non-limiting example, for example, for a casting of a wide slab of approximately 2000 mm or more, a split-type stirring roll with two distinct inductors each having a sleeve approximately 1000 mm long; A central support with a width of approximately 10 cm can be provided. The half sleeve diameter may be approximately 240 mm or more.

  As a variant, two half sleeves of unequal length can be provided for at least some of the split stirring rolls having a central support provided in a continuous slab caster. That is, the absence of guidance of the cast slab over the width of the central support can cause the portion of the slab passing through the front of this “gap” to expand. Therefore, split stir rolls having adjacent half-sleeves of unequal length can be expanded by arranging and arranging their central supports in a way that is therefore shifted between two successive split stir rolls. It would be possible to make sure that the width of the slab would not always be the same. Thus, if necessary, slab defects caused by cracking and porous expansion will be avoided.

  It will be observed that the rolling bearing of the sleeve may be exposed to the heat of the slab during casting, even more than in the known art of stirring rolls with support shafts offset on both sides of the sleeve. . Thus, in a variant, it would be advantageous to select a helically heat-deformed sleeve rolling bearing. This type of mechanical rolling bearing is commercially available. For the sake of information only, the rolling bearings produced and sold by the German company “Machinenfabrik Joseph EICH KG Gmbh” are shown here.

  It will be appreciated that the invention is not limited to the described embodiments, but extends to numerous variations or equivalents so long as the definition provided by the following claims is adhered to. It is what is done.

  For example, the term “shaft neck” used to refer to one sleeve or the support elements attached to the ends of two sleeves that make up a split-type stirring roll is the term “sleeve” and their freedom along the axis. It should be understood that it covers any transmission means that can ensure a watertight rigid connection between the rolling bearings that support it in a smooth rotation.

DESCRIPTION OF SYMBOLS 1 Sleeve 3 Rolling bearing 4 Support element 5 Chassis 6 Cast slab

Claims (3)

A stirring roll for a continuous casting machine of a metal product having a wide cross section like a slab,
-(A) at least one outer sleeve of non-magnetic steel that rotates along an axis to come into contact with the surface of the large face of the cast slab;
-(B) a mechanical coupling device that secures support of the sleeve at the end of the sleeve while freely rotating the sleeve along the axis;
-(C) a support element for the stirrer roll that is offset from the center on both sides beyond the sleeve and is fixed to the chassis of the casting machine;
-(D) an internal electromagnetic device composed of at least one sliding magnetic field type multiphase linear inductor, which is mounted coaxially with the sleeve and provides an annular space between which the cooling liquid circulates. The device corresponds to an axis along an axis, with a distal extension, which loads the support element and prevents it from rotating along the axis, The terminal extension is hollow to allow the passage of cooling liquid and the passage of the electrical connection of the inductor, and-(e) the inductor with electrical connection terminals and beyond the support element A cooling liquid inlet / outlet case attached to the end of the end extension of
Including
The sleeve (1) is loaded onto the inductor (8) via a mechanical coupling at the end consisting of a rolling bearing (3) placed between the sleeve and the terminal extension (20) of the inductor. the over,
The sleeve (1) has two completely different two side by side with an additional mechanical coupling device with an intermediate extension (20c) of the inductor without electrical winding at their close ends. Consisting of half sleeves (1a, 1b),
A central support (21) is connected to the casting machine chassis (5), and the additional mechanical coupling device is supported by at least one intermediate rolling bearing (20) supported by the intermediate extension (20c) of the inductor. 3c, 3d)
Intermediate extension of said inductor (20c), characterized in Rukoto a load on said central support (21), stirring roll. Each half sleeves (1a, 1b) characterized in that the incorporation of specific inductor (8a, 8b), stirred roll according to claim 1. The intermediate rolling bearing is a single rolling bearing common to the two half sleeves (1a, 1b), the rolling bearing being fixed on both sides of the ends of the two half sleeves. The stirring roll according to claim 1 .

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