RU2600776C2 - Stirring-roll for a continuous cast machine of metallic products of large cross section - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention relates to continuous metal casting. Shell ring (1) of stirring roll coming in contact with surface of large face (7) of the cast slab (6) is made of nonmagnetic steel. Polyphase linear inductor (8) is mounted coaxially with respect to the shell ring. Support elements are located on both sides of the shell ring and fixed to the rigid frame of the casting machine. Terminal extensions are supported by support elements of the axial shaft fixed against axial rotation. Bearings (3), retaining shell ring with its axial rotation are arranged between shell ring and terminal extensions.

EFFECT: higher rigidity of the shell in cast slabs of various width.

4 cl, 3 dwg

Description

The present invention relates to traveling magnetic field electromagnetic systems for driving molten molten metal inside a metal product with a wide direct cross section, such as a slab, in the process of curing it at the outlet of the mold in the secondary cooling zone of the continuous casting plant that produces it.

More specifically, the invention relates to the manufacture of equipment of this type, usually called a mixing shaft, when it is integral with the holding and guide shaft of the cast slab, made for this purpose tubular.

It is known that the electromagnetic part of such equipment is classically formed by a linear multiphase inductor generating a traveling magnetic field oriented perpendicular to the surface of the shaft shell that surrounds it and which moves along the axis of rotation of this shaft.

If you take a brief excursion into the history of this technology, today widespread in the world metallurgy for continuous casting of slabs, you should schematically dwell on three points.

The first and main one is presented in document FR 72/20546, published in December 1973, which describes a central linear multiphase inductor mounted coaxially with the shell surrounding it. This is how the mixing shaft appeared, since such active equipment is capable of replacing one or more holding and guide shafts that completely fill the previous casting plants. Two main options appear here: a rotating inductor with a shaft cover (shell) in contact with one of the large sides of the cast slab, or a stationary inductor.

The second is presented in document FR 75/05623, published in August 1976, which presents the basic technological concept of a mixing shaft with a rotating inductor, based on the shell and mechanical connecting elements that ensure the holding of the shell during its free axial rotation. These organs in this case are schematically formed by a system made on each side of the shell in the form of a tubular shaft step in the form of a truncated cone mounted on the end of the shell, and a rolling bearing installed in the retaining element of the shell extended beyond the edges of the shell and mounted on the chassis of the casting machine while a smaller shaft stage is installed in this bearing in the possibility of rotation. As for the central inductor, it is located in the center of the inner part of the larger steps of each shaft. At least one of the shaft steps (removable for mounting the inductor in the shell) extends beyond the retaining element of the bearing for the electrical connection of the inductor with external multiphase power.

The third is document EP-A-0 043 315, published in January 1982. This document describes in detail the operational assembly of the mixing shaft, in this case with a fixed inductor, which is used today: it contains the same structure as the structure with a rotating inductor, except that the central inductor is held in this case by its own internal structure on which phase electric windings are wound. This internal structure forms for this an axial shaft, the end extensions of which, tapering in diameter, pass through the small bases of the stepped shell shafts in order to enter into connection with the rolling bearings holding the shell and secured to the machine frame by means of a cage fixed by a key mounted on the outer surface bearings and which fixes the inductor from axial rotation.

This cage also forms the bottom of a sealed water tank equipped with inlets / outlets for cooling the shell and inductor by circulating in the annular space separating the inductor and the shell. The water tank also plays the role of a remote control for the electrical connection, which connects the inductor to an external power supply.

Basically, as the right adjoining part of Fig. 1 shows, such a known design of the mixing shaft is characterized by the combination of two separate coaxial nodes, one of which rotates freely and the second is stationary, both of which are supported by retaining elements 4 of the shell 7, mounted on the frame 5 casting plants:

- the first node, stationary in axial rotation, is formed by a central inductor 8, the end extensions 12 of which are supported by centering holders 14, which fixes it from axial rotation and which are rigidly connected to the casting installation frame 5 by means of holding elements 4,

- and the second node, movable in axial rotation, formed by a shell 1, designed for rolling contact with the molded sheet ingot 6 and two tubular steps of the shaft 2, which continue it from each of the ends in order to enter the rotary bearings 3 of a smaller base, located on the holding elements 4, mounted on the frame 5 of the installation.

For convenience, the water tanks 16 also serve as connectors 18 for electrical connection of the inductor, hermetically closing the holders 14 from the outside.

This type of mixing shaft, which is perfect for performing the double function of holding-mixing, is often used for most continuous casting plants for slabs of standard width, i.e. up to about 1600 - 1700 mm, the width at which the shell held by two end bearings is tough enough to form fatal sag.

This type of mixing shaft, made of two half shafts with an intermediate rolling bearing, could also be used for very wide slabs, even exceeding 2400 mm, to provide such a shaft with rigidity and geometric straightness at thermomechanical stresses arising from its contact with a very wide sheet ingot in the process of curing it (WO2011 / 117479).

 However, for slabs of intermediate width, for example, from 2000 mm to +/- 20% (from 1600 to 2400 mm to clarify the concepts), this technology seems unacceptable. The presence of shaft end steps makes the active part of the inductor very short in order to use a solution of two shafts with an intermediate bearing and a solution with a single shaft without an intermediate bearing, which would lead to sagging, especially since the presence of shaft end steps removes the fulcrum the chassis of the casting installation from a single distance necessary to cover the slab over its entire width. For example, a mixing shaft with a diameter of 240 mm, installed at a distance of about 3 m below the level of the metal exiting the mold in a “standard” casting plant with a width of 1600 mm, has a sagging less than 1 mm under the influence of the ferrostatic support of the slab as in a 2000 mm installation, the sag would be 4 mm, which is unacceptable.

Owing to this statement and while maintaining the functional and operational qualities of conventional mixing shafts, the aim of the present invention is to propose a technological construction of shafts devoid of end steps to ensure shell rigidity, which makes it possible to make more economical both in terms of initial cost and their functioning, and, in particular , in the sense of the implementation of the possibility of fulfilling all possible requirements for the width of the slabs from 1600 mm (or less) to 2400 mm (or more).

To achieve this goal, the object of the invention is a mixing shaft for installation of continuous casting of metal products with a wide direct section, such as sheet ingots, containing:

- (a) at least an outer shell with axial rotation made of non-magnetic steel, designed to ensure contact with the surface of the large side of the cast slab,

- (b) a mechanical linking body providing retention of the shell and its free axial rotation,

- (c) elements for holding the mixing shaft, extended on both sides beyond the edges of the shell and attached to the frame of the casting installation,

- (d) internal electromagnetic equipment formed by at least a multiphase linear inductor with a traveling magnetic field mounted axially with the shell so as to form an annular space between them for the circulation of the coolant, while the said equipment is formed by an axial shaft provided with end hollow extensions that are fixed in the support from axial rotation in said holding elements, and

- (e) tanks with coolant inlet / outlet, provided with electrical connection clamps mounted on the end extensions of the inductor behind said holding elements;

the mixing shaft is characterized in that the shell is inserted by the said end extensions of the inductor into the intermediate mechanical coupling elements formed by bearings placed between the shell and the said end extensions (preferably, at the ends of the shell).

As will be understood, the main idea of the invention is the implementation by the inductor of the function of holding the shell, which rotates around it at a small distance. For this, the rolling bearings of the shell or, in general, its mechanical coupling organs, providing its axial free rotation, are separated by conventional holding elements rigidly connected to the design of the casting installation. Thus, the latter provides an exceptional opportunity to receive the end extensions of the inductor, while the rolling bearings necessary for free axial rotation become just simple bearings mounted on the end extensions of the inductor.

Among the main advantages inherent in the construction of the mixing shafts of the invention, which will be described in more detail below, are suppression, since they disappear, or, in any case, a significant reduction in the phenomena of “articulation” of rolling in bearings.

The technological concept of the invention opens up particularly attractive opportunities for simplified manufacturing of ultra-long mixing shafts intended, as already mentioned, for casting machines for wide slabs (more than 1600 mm), the trend of which is increasingly being introduced into the global metallurgy, driven by the requirements of an ever-increasing steel production.

Indeed, it is known that single tubular shafts of large length, when supported on them, may sag under the influence of the ferrostatic pressure of the slab. To solve this problem, in accordance with another embodiment of the invention, preferably applicable for casting large slabs, such an extra long mixing shaft (hereinafter referred to as a “divided mixing shaft”) contains, in fact, not one, but two separate aligned shells. These two shells preferably have the same length and are provided with two additional intermediate bearings that hold the intermediate central extension of the axial bearing structure of the inductor. This intermediate extension is held by an additional central holder fixed to the casting installation frame.

It should be noted that the advantage of this option is the compactness of the central bearing area of the divided mixing shaft, and compactness cannot be achieved with end stepped shafts, which leads to a more extended and, therefore, better mechanical retention of the slab in the central region of its large sides.

Another advantage of a split mixing shaft is the operational order in the case of very wide slabs, for example large 2000 mm, two inductors, electrically and magnetically independent of one another, can be combined in one supporting axial inductor structure inside one mixing shaft using a central fixed holder mounted on the frame installation.

In all embodiments, the mixing shaft according to the invention, in comparison with traditionally known shafts, is characterized in that the end rolling bearings as well as the stepped shafts are removed and replaced by simple holders of the fixed non-rotating shaft represented by the end extensions of the inductor, and the shell rotates around this fixed shaft on which the bearings holding it are placed.

This arrangement leads to a significant reduction in the distance separating the stationary holders of the mixing shaft, and, thus, a relative decrease in sagging during the operation of the shell, which implies a decrease and even the disappearance of the articulation phenomenon.

In addition, the efforts that the shell exerts on the communication organs are no longer transmitted by the steps of the shafts, necessarily tubular, but are applied directly to the central shaft, which can be calculated as necessary to exclude any deformation. In addition, the arrangement of the intermediate bearings in a split mixing shaft embodiment minimizes the distance between the two shells, that is, the maximum continuity of the slab holding along the width.

The invention is further explained in the following description, which is not restrictive, with reference to the accompanying drawings, in which:

- FIG. 1 gives a general view of the axial section of the mixing shaft, deliberately combined to facilitate comparison with the prior art in the sense that its left edge (in the drawing) is made in accordance with the invention, while its right edge is made according to the prior art;

- FIG. 2 shows an axial sectional view of a mixing shaft in the basic version in the form of a single shell (without a central holder);

- FIG. 3 is an axial sectional view of a double-shell embodiment with a central holder, called a “split mixing shaft”.

Turning first to a reminder to the right side of FIG. 1, it can be seen that the classic mixing shaft is mainly formed by an elongated tubular body rotating around its main axis of symmetry AA. This housing is formed by a shell, or casing, 1 of non-magnetic stainless steel, and steps of the shaft 2 in the form of a truncated cone 2, which hold this casing at both ends, while the small base 2a of each step of the shaft is placed in a rolling bearing 3 'located in the holder 4 rigidly connected to the frame 5 of the continuous casting installation.

This casting installation allows you to cast metal sheet ingots 5, which come out of the mold in the upper position to the tool for cutting in length at the bottom of the installation. At the same time, complete solidification of the molten metal from the periphery of the molten product 6 is gradually carried out under the effect of intensive cooling of its surface by contact with the internal walls of the mold, then direct irrigation with water in the secondary cooling stages of the casting installation at the exact location where the mixing shafts of the plants are located, which are equipped with them.

Indeed, in this direction, the molded slab is held and slowly moves downward by supporting rotating shafts, which, along a generatrix constantly updated during rotation, enter into contact contact with each of the large sides of the slab, such as the big side 7 in the drawing.

As shown, the volume inside the shell 1 is almost completely occupied by an electromagnetic inductor 8, designed to provide controlled movement of the metal, still molten in the thickness of the slab 6. For this, the linear multiphase type inductor 8 contains a magnetic casing 9, which serves as a support for winding the phase windings 10, which are arranged one after the other along the inductor so as to generate a magnetic field generally directed perpendicular to the large sides of the slab 6, but movable, namely moving along the axis AA of the inductor, when these windings 10 are correctly connected to the terminals of an external multiphase power supply (two-phase or three-phase), not shown in the drawing.

This inductor 8 is a body with axial symmetry about its longitudinal axis, which coincides with the axis AA of the shell 1, to be well centered relative to the latter and to form between them an annular space 11 for the circulation of the cooling medium, which will provide the thermal regime of the mixing shaft when work. This axial centering is carried out with the help of the end cylindrical extensions 12 of the reduced diameter inductor in order to be able to pass with a small working clearance into the small base 2a of the shaft 2 stage and go beyond the last for the bearings 3 for the span 13, which serves for key mounting for fixing inductor from axial rotation at the level of end plates equipped with the necessary keys. Each end extension 12, which is hollow (axial channel 24) and provided with radial passages for communication with the annular space 11, opens into a water tank 16 sealed on the end plate 14 and provided with a pipe 17 for entering or leaving cooling water (exit to drawing).

It can be seen that the water tank 16 also serves as a connection with the clamps 18 for connecting the inductor 8 with an external multiphase power supply, while the connecting wires 19 of the inductor pass in the axial cavity of its extension 12 for connection with the clamps 18.

When considering FIG. 2 or the left side of FIG. 1 it can be seen that the mixing shaft according to the invention (the forming elements of which are identical to the known forming elements discussed above and are denoted by the same positions) differs from the well-known classical technique in that there is no rolling bearing 3 ', as well as shaft steps at each end of the shaft. This feature allows you to make room for the end extension 20 of the inductor 8, which, thus, is fixed from rotation by a key 31 in the hole of the stationary holder 4.

As shown, but not necessary, this extension 20 is made more massive, with a slightly larger diameter than the similar end extension 12 of the classical mixing shaft (right side of the drawing), in order to increase its mechanical strength if necessary, since at this point the shaft more loaded, as will be understood below.

Indeed, on the one hand, bearings 3 replace the end stepped shafts of the shell 1 (which are thus removed) and carry out the functions of holding and driving the rotation of the shell, and, on the other hand, these bearings 3 carry directly the end extension 20 of the inductor, which, thus, serves as a support for the shell 1.

It should be noted that due to the exclusion of the end stages of the shafts, the distance of the calipers 4 between themselves decreases by 25-40 cm compared with the prior art, or about 20% of the length of the mixing shaft.

Bearing 3 is mounted on each end of the shell. This fastening can be provided in a known manner with a bolted ring, not shown in the drawings, so as not to overload them. In addition, it is preferable to provide an annular flange 32 at the end of the shell, which would serve as a plate for lubricating the bearings 3 and which closes the bearings to protect them from dust and improve the tightness of the node.

However, it would be preferable, as indicated at the beginning, to provide at least one of the two ends, if not both, with a mechanically “opened” bearing cover to facilitate mounting of the inductor 8 inside the shell 1 in the workshop.

FIG. 3 shows an embodiment of the construction according to the invention, used when the mixing shaft no longer has a single shell extending over the entire width of the cast slab, but consisting of two half shells 1a and 1b.

These two collinear half-shells are held at the proximal ends by intermediate bearings 3c and 3d and are spaced apart from each other by a small distance (for example, from 10 to 20 cm) depending on the presence of an intermediate inductor clearance 20c between them. Since the end bearings 3a and 3b are located on the end extensions 20a / 20b of the inductor, the intermediate bearings 3c and 3d are located on the intermediate extension 20c of the inductor, which for this does not contain electrical windings and is mounted on the central holder 21, mounted on the frame 5 of the casting installation.

As already mentioned, such a mixing shaft, which we will call “divided” for the reason that follows from the obviousness of what has been said, which is really formed from two half shells 1a and 1b, adequately meets the growing needs of world metallurgy, can continuously give out ever wider sheet ingots, easily exceeding the boundaries of conventional mixing shafts, ranging from 1.6 / 1.7 m, and even 2.4 m wide, and in the near future, without doubt, even larger, since this divided mixing shaft is protected from sagging central holder 21.

The end extensions of the inductor 20a or 20b located along the edges of the shaft are hollow in order to open:

- on the one hand, with a free end into sealed water tanks 16a or 16b, equipped with pipelines for water inlet / outlet 17a or 17b, and consoles with clamps 18a and 18b forming one of the walls (front wall in the drawing),

- and, on the other hand, into the annular space 11a or 11b made between each half-shell 1a or 1b and the inductor 8 through the hollow radial channels 15a or 15b.

The intermediate extension 20c is also hollow and is provided with hollow radial channels 15c, 15d to form a sealed central communication channel between the two annular spaces 11a and 11b.

The cooling of the half shells 1a and 1b and the inductor 8 is also provided by a common water cooling system containing the following elements, taken in the order corresponding to the direction of circulation of the coolant, from left to right in FIG. 3:

- a water supply tank 16 a, in which cooling water enters through an inlet pipe 17 a connected to a pressurized water source not shown in the drawing;

- axial channel 24a in the left outer end extension 20a of the inductor 8 with radial channels 15a that open from the edge of the annular space 11a,

- the mentioned annular space 11a, made between the half-shell 1a and the concentric inductor 8 to ensure water circulation near the half-shell 1a and cooling during and after contact with the hot sheet ingot 6, as well as cooling the left side of the inductor 8;

- hollow radial channels 15c, an axial channel 26 and radial hollow channels 15d of the intermediate extension 20c of the inductor, which communicate the annular space 11a with the space 11b;

- the said annular space 11b between the half-shell 1b and the inductor 8 can be designed to ensure water circulation near the periphery of the half-shell 1b and cooling during and after its contact with the hot sheet ingot 6, as well as cooling the right side of the inductor 8;

- hollow radial channels 15b and the axial channel 24b of the right outer extension 20b of the inductor, which opens into the tank for removing water 16b

- and the water removal tank 16b is provided with a nozzle 17b for loop recovery of cooling water.

The intermediate extension 20c of the inductor assumes, of course, that the electric windings 10 are spaced in this direction, but the mechanical continuity between the left and right parts of the inductor is ensured by this extension, which can be made of steel or the same material as the axial supporting structure of the inductor .

In accordance with the embodiment of FIG. 3, a divided mixing shaft may comprise two separate and separated electromagnetic inductors, one in each half-shell: an inductor 8a in the left half-shell 1a and an inductor 8b in the right half-shell 1b. The inductors 8a and 8b presented in this case and in accordance with a preferred embodiment of the invention are identical to each other and are similar to the single inductor of FIG. 1 or 2.

These inductors can be made mechanically interconnected by an intermediate extension of 20 s or separated, for example, to facilitate installation, but joined at the level of the central holder 21. As shown in the drawing, a simple coupler-socket coupling will be sufficient to provide mechanical coupling between the two inductors.

However, it is understood that such a mechanical connection between the two inductors 8a and 8b is necessary only for the formation of the connection on the Central holder 21, when the latter is a single. Indeed, it is also possible to provide an option in which each inductor has its own central holder at its inner end. In this case, two central holders could be located one next to the other, each of which is fixed to the casting installation frame. In this case, however, it is necessary to provide a connection, even flexible, but tight between the two inductors connected to provide cooling water circulation.

Another aspect that might be inconvenient for this option is that the removal between two half-shells would be relatively large and with this removal, part of the width of the cast slab 6 remains free without any mechanical support and is not cooled in the “dead zone” at the level of the intermediate bearings . In any case, it would be possible to weaken the undesirable effects on the sheet ingot and provide for gaps between the shells of variable length and different ones on the same mixing shaft. In accordance with well-known rules, it would be possible to separate “dead zones” along the slab width from one shaft to another according to the height of the casting plant in order to try to smooth out differences in violations after several meters of slab movement in the flow direction.

However, it is clear that no matter how acceptable the embodiment, in the area of the central holder 21 there is a mixing shaft of two half shells with two separate inductors 8a and 8b, generating traveling magnetic fields, which can be regulated independently from each other both in power and and in the direction of sliding along the axis of the inductors, if only you have two power sources or a single power source configured to separately power each inductor. It is for this purpose, preferably for practical use, that the redundancy for a given inductor 8a or 8b is made by a remote control with electrical clamps, which is closest to it, respectively 18a and 18b.

For better clarity of presentation, it should no doubt be recalled now that the inductors 8a and 8b are linear multiphase (three-phase or, usually, two-phase), for each of which pairs of connecting clamps for power phases are necessary: two pairs for two-phase, three pairs for three-phase (note, however, that in the case of electrical installation of the inductor "without neutral" the number of clamps will be three for two-phase and three for three-phase).

An inductor of this type forms a magnetic field, the lines of force of which are usually oriented perpendicular to the longitudinal axis AA of the inductor and are movable, since it can be made to move along this axis in one direction or another by simple phase inversion of the power supply. It is clear, therefore, that if you have two power sources or, which is the same thing, a double power source, you can adjust the traveling fields on two inductors 8a and 8b of the same mixing shaft independently of one another, which opens up particularly attractive prospects in with regard to the possibilities of moving molten metal in the thickness of the slab during casting.

It should be noted that such a mixing shaft, divided into two separate inductor, does not visually differ from the mixing shaft with a single inductor. Simply, each inductor must have a complete set of windings that allow generating a traveling magnetic field (at least four for a two-phase inductor and six for a three-phase inductor), while in a single inductor its set of windings is distributed between the right and left parts, which can, for example, allow increasing the number of pole pairs per phase.

On the other hand, the connections of the windings of one inductor with the phases of the power supply are preferably directed to one remote control located at the end of the shaft, and the connections of the other inductor will be directed to the remote control located at the other end of the shaft (in this case, connection 18a to the closest remote control 19a and the connection 18b to the remote 19b), while in a single inductor half of the connections can be grouped on the left and the second half on the right.

It is clear that in the case of a divided mixing shaft with a single inductor (Fig. 2), and in the case of two separate inductors (Fig. 3), it is necessary to provide connections through the intermediate central extension 20c of the inductor, which otherwise would complicate the design and installation of the installation.

The mixing shafts of the invention, in their embodiment without a central holder 21, can be easily integrated into a segment of the casting installation structure containing other conventional slab holding and guiding shafts. This is also true for the split mixing shafts of the invention, since conventional holding shafts are typically provided with intermediate bearings or intermediate holders in case of wide segment structure machines, with frames already provided for the central holders.

From these observations it follows that in order to confirm them, undivided mixing shafts with a single shell, that is, without a central holder, in accordance with an embodiment of the invention will more likely be used for casting slabs of classical width, i.e., up to about 1650 mm. For these dimensions, it is preferable to use divided mixing shafts with two shells and a central holder, emphasizing, however, that there are no obstacles to their use in casting slabs of regular width.

As a non-limiting example, for casting wide slabs of the order of 2000 mm or, for example, more, split mixing shafts with two separate inductors can be provided, each of which has a shell length of about 1000 mm with a central holder approximately 10 cm wide. Half shell diameters may be of the order of 240 mm or more.

Alternatively, at least for certain divided mixing shafts with a central holder, with which a slab casting unit is equipped, can be provided so that the lengths of the two half-shells are unequal. Therefore, the absence of the direction of the molded slab along the width of the central holder can lead to the fact that part of the slab, passing opposite this "gap", can be inflated. Thus, the implementation of divided mixing shafts having two adjacent half-shells of unequal length with a central holder in order to separate two consecutive divided mixing shafts between them will make it possible that the same part of the slab width is not always inflated. In this way, defects of the slabs caused by expansion, such as cracks and porosities, are avoided, if necessary.

You can see that the shell bearings can be more exposed to heat from the slab during casting than in the known design of mixing shafts with bearing end steps spaced on both sides of the shell. Alternatively, it is preferable to select shell bearings with spiral thermal deformation. This type of mechanical bearings is commercially available. For this, it is purely informative that the bearings are manufactured and sold by the German company Maschinefabrik Joseph EICH KG Gmbh.

It follows that the invention is not limited to the described examples of embodiment, and it extends to numerous variations or equivalents to the extent that they are presented in the following claims.

For example, it is understood that the term “shaft stage” used to describe the retention elements mounted on the ends of one or two consecutive shells of one divided mixing shaft means any transmission organ capable of providing a tight seal between the shells and rolling bearings that provide them free axial rotation.

Claims (4)

1. A mixing roller installation for continuous casting of metal slabs, containing:
(a) at least an outer shell of non-magnetic steel, rotating around its axis and in contact with the surface of the wide side of the cast slab,
(b) mechanical coupling elements holding the casing during its axial rotation,
(c) supporting elements located on both sides beyond the borders of the shell and connected to the frame of the continuous casting installation,
(d) electromagnetic equipment, consisting of at least a linear multiphase inductor creating a traveling magnetic field, mounted coaxially to the shell with the formation of an annular space between them for the circulation of coolant, and an axial shaft with end elements supported by supporting elements and fixed from axial rotation, and the end elements are hollow to ensure the passage of coolant and placement of electrical connections of the inductor and
(e) reservoirs for entering and leaving the coolant, provided with electrical connection clamps and placed at the ends of the end elements behind the support elements,
characterized in that the mechanical coupling elements are made in the form of bearings placed between the outer shell and the shaft end elements (20). 2. The mixing roller according to claim 1, characterized in that the shell contains two identical half-shells (1a, 1b) with mechanical coupling elements, the axial shaft is made with an intermediate element without electric windings of the inductor, while the roller is provided with a central support for the intermediate element, rigidly connected to the frame (5) of the continuous casting unit, and the mechanical coupling elements comprise at least one intermediate bearing (3c, 3d) placed on the intermediate element (20c). 3. The mixing roller according to claim 2, characterized in that for each half-shell (1a, 1b) its own inductor (8a, 8b) is installed. 4. The mixing roller according to claim 2, characterized in that said intermediate bearing is a common bearing for two half shells (1a, 1b) and is attached to the edges of the half shells.

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