KR100220372B1 - Apparatus and method for magnetically confining molten metal - Google Patents

Abstract

The gap is prevented by a leak control device 30 using magnets employing a proximity effect in which molten metal contained in the space between two rotating rolls facing the strip continuous casting device generates a horizontal magnetic field extending through the gap's open surface. The leakage to the outside of the open surface 36 of the 35 is prevented. The leak restricting device 30 includes a device that restricts the magnetic field to the open surface 36 of the gap 35 and prevents the magnetic field from being dispersed from the open surface 36 of the gap 35.

Description

Leakage Control Device and Method of Molten Metals Using Magnetics

1 is a plan view showing one embodiment of the device according to the invention in connection with a pair of rolls of a strip continuous casting machine.

2 is a cross-sectional view of the leak restrictor and roll in FIG.

3 is a side view of the leak restrictor and roll.

4 is an exploded perspective view of the leak control device.

5 is a perspective view of a leak restrictor with each component assembled.

6 is a front sectional view of a single turn coil as part of a leak restrictor.

7 is a side view of the coil shown in FIG.

8 is a plan view of a magnet cover which is another component of the leak restrictor.

9 is a front sectional view of the magnet cover shown in FIG.

10 is a plan view of a conductive shield that is another component of the leak restrictor.

FIG. 11 is a front sectional view of the conductive shield shown in FIG.

12 is an enlarged front cross-sectional view of the leak restrictor.

13 is an enlarged plan view of the leak restrictor.

FIG. 14 is a cutaway view along the 14-14 line in FIG. 12, partially enlarged, showing the magnetic field generated by the leak restrictor near the top of the gap between the rolls.

FIG. 15 is a cutaway view along line 15-15 in FIG. 12 showing the magnetic field generated by the leak restrictor near the bottom of the gap.

16 is a front sectional view of a leak restrictor according to another embodiment of the present invention.

FIG. 17 is a cutaway view along line 17-17 in FIG. 16. FIG.

FIG. 18 is a cutaway view taken along the 18-18 line in FIG. 16. FIG.

19 is a front sectional view of one component of the embodiment shown in FIG.

20 is a plan view of the reference numeral shown in FIG.

21 is a front sectional view of another part of the embodiment shown in FIG.

FIG. 22 is a plan view of the part shown in FIG.

FIG. 23 is a cutaway view taken along the 23-23 line in FIG.

24 is a perspective view showing a state in which the bus bar and the cooling conduit is connected to the embodiment shown in FIG.

25 is an exploded perspective view of a leak limiter according to another embodiment of the present invention.

FIG. 26 is a perspective view of the leak restricting device in which the parts shown in FIG. 25 are assembled. FIG.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to an apparatus and a method for preventing leakage of molten metal using magnetic, and more particularly, vertically extending between two horizontally arranged members, the molten metal being contained therein. A device and method for preventing the leakage of molten metal into the open surface of a gap.

One example of an environment to which the present invention is applied is an apparatus for continuous casting of molten metal directly into a strip, for example a steel strip. Such an apparatus generally consists of a pair of rolls which are arranged horizontally and fixed so as to rotate in opposite directions on each horizontal axis of rotation. The two rolls arranged horizontally form a vertical extension gap between the two rolls to accommodate the molten metal. The gap formed by the roll becomes narrower toward the downward direction. Since the roll is cooled, the molten metal going down through the gap is cooled accordingly.

The gap has opposing ends that are horizontally spaced and open near both ends of the two rolls. Molten metal is not limited by the roll at the open end of the gap. In order to prevent the molten metal from leaking out through the open end of the gap, a mechanical dam or seal was used.

Mechanical dams have the disadvantage that the rotating rolls and the molten metal are in physical contact. As a result, the dam is liable to wear, leak and break, and the thermal gradient in the molten metal can be large and solidify. In addition, the contact between the mechanical dam and the solidified metal may cause irregular casting along the edge of the metal strip to be cast by this method, whereby the thickened solid is rolled into the metal strip. This will offset the advantages of the continuous casting method over the method.

The advantages of continuous casting of metal strips and the disadvantages of using mechanical dams or seals are described in more detail in US Pat. Nos. 4,936,374 and 4,974,661. This reference is included.

To solve the shortcomings of using mechanical dams or seals, the gap between the rolls is made by using a core wound by a conductive coil with alternating current and an electromagnet with a pair of electrodes adjacent to the open end of the gap. Attempts have been made to accept molten metal at the open end. The magnet is energized by an alternating current flowing through the coil, and the magnet generates an alternating or time varying magnetic field that extends across the open end of the gap between the poles of the magnet. The magnetic field may be arranged horizontally or vertically, depending on the arrangement of the poles of the magnets. An example of a magnet for generating a horizontal magnetic field has been described in US Patent No. 4,936,374, and an example of a magnet for generating a vertical magnetic field has been described in US Patent No. 4,974,661.

The alternating magnetic field generates a eddy current in the molten metal adjacent to the open end of the gap and generates a repulsive force that pushes the molten metal away from the magnetic field generated by the magnet, thereby dissolving the molten metal away from the open end of the gap.

The static pressure that pushes the molten metal outwards from the open end of the gap between the rolls increases as the depth of the molten metal increases, and the magnetic pressure generated by the alternating magnetic field is sufficiently against the maximum outward pressure acting on the molten metal. You should be able to. A more detailed description of the requirements described so far and the various variables associated with these requirements are described in the above-mentioned US Pat. Nos. 4,936,374 and 4,974,661. Another method of receiving molten metal at the open end of the gap between the pair of members is to place a coil through which an alternating current flows adjacent the open end of the gap. For this reason, in the coil, as a result of the repulsive force similar to that described above in relation to the magnetic field generated by the electromagnet, a magnetic field is generated which causes the eddy current in the molten metal adjacent to the open end of the gap. Examples by this method are described in US Pat. No. 4,020,890, the contents of which are incorporated herein by reference.

Using an electromagnet, the coil must be used to magnetize the core of the magnet, through which the magnet must pass through a magnetic pole that generates a magnetic field in the vicinity of the open end of the gap, thus directly in the vicinity of the open end of the gap. Using a coil that generates heat is much more effective than using an electromagnet. As a result, a so-called "coil loss" occurs when a coil magnetizing the electromagnet is used, but a coil loss is not an important factor when a coil that generates a magnetic field directly at the open end of the gap.

The drawback with the latter method is that the coil must be adjacent to the open end of the gap in order to generate a magnetic field where the molten metal is received. In a method using an electromagnet, the coil can be relatively far from the open end of the gap. The closer the coil is to molten metal, the more severe the coil is subjected to heat. Another drawback in using coils that generate magnetic fields directly at the open ends of the gap is that some of the magnetic fields are radiated away from the open ends of the gaps, thereby reducing the efficiency of the coils. The problem in the description so far is also a problem in the case of using an electromagnet.

The disadvantages and drawbacks of the conventional method described so far can be solved by the apparatus and method according to the present invention.

The method and apparatus according to the present invention employ a proximity effect of generating a horizontal magnetic field extending directly through the open end of the gap to the molten metal contained in the gap, near the open end of the gap, so that the magnetic field is generally at the open end of the gap. Limited. A horizontal magnetic field is arranged adjacent to the open end of the gap, the surface portion of the coil being generated directly by the coil towards the open end of the gap.

In general, an alternating current flows through the coil to generate a horizontal magnetic field that extends from the surface portion of the coil to the molten metal over the end of the gap.

In applying the proximity effect, the coil has an open surface of the gap so that the strength H of the magnetic field at the open surface (end) of the gap can sufficiently offset the pressure of molten metal to escape from the open surface of the gap. It needs to be located close enough to As the distance from the open face of the gap to the coil increases, the strength of the magnetic field generated in the coil decreases. The electromagnetic pressure between the two conducting surfaces, in this case the coil and the molten metal, is proportional to the square of the magnetic field strength (H ² ).

The coil and the structure associated with the coil are disposed close enough to the open end of the gap to accommodate the molten metal in the gap, and the opposite effect of this closeness is offset by the structure protecting the coil, which will be described next.

By limiting the magnetic field generated by the coil to the open side of the gap, the magnetic field is prevented from being lost in a direction away from the open side of the gap. This is achieved by partially installing a nonmagnetic electrical conductor that is electrically conductive with the coil and faces the open side of the gap and is sufficiently adjacent to the open side of the gap to limit the magnetic field to the open side of the gap. The coil has an upper part and a lower part, and the conductor generally occupies the entire area between the upper part and the lower part of the coil. The structure consists of a magnetic material which provides a low magnetoresistance return path of a directly generated magnetic field, in which a coil directed toward the open side of the gap concentrates the flow of current on the surface portion and extends through the open side of the gap. have.

The nonmagnetic conductor is configured to match the tapered shape of the gap to increase the magnetic pressure on the molten metal with increasing static pressure (ie, depth of molten metal) of the molten metal contained in the gap. In some embodiments, the conductors and the surface portions of the coils facing the open side of the gap are coincident such that they are one and the same.

The features and advantages of the methods and apparatuses described and claimed so far will become more apparent to those skilled in the art by the detailed description taken in conjunction with the accompanying drawings.

EXAMPLE

First, referring to FIGS. 1 to 3, 12 and 13, reference numeral 30 denotes a regulating device using magnetism constructed by an embodiment of the present invention. The leak restrictor 30 prevents the molten metal from leaking into the open face 36 of the vertically extending gap 35 located between two metal rolls 31 and 32 installed horizontally in the strip continuous addressing device. In order to achieve this, a proximity effect is adopted. Rolls 31 and 32 rotatably supported relative to each rotation axis 33 and 34 rotate in opposite directions to each other. Molten metal is generally contained within the gap 35. The rolls 31 and 32 have not been described here, but have been cooled by conventional methods and the molten metal descends vertically along the gap 35 and down through the narrowest portion of the gap 35. The molten metal is then cooled and solidified into a metal strip (Figure 12).

Without the leak limiter 30, the molten metal contained in the gap 35 will leak to the open face of the gap 35. In the figure, one open face 36 and one leak restrictor 30 of the gap 35 are shown, with an open face at each open end of the gap 35 and a leak restrictor 30 at each open end. ) Is easy to understand.

The leak restrictor 30 is disposed at a position adjacent the open face 36 of the gap 35 and consists of a current conducting coil with a coil surface facing the open face 36. An alternating current is conducted through the coil 40 by the method described below, and the alternating alternating current directly generates a horizontal magnetic field, because the coil 40 is adjacent to the open surface 36, so that the The magnetic field may extend from the surface of the coil 40 past the open face 36 of the gap 35 to the molten metal contained in the gap. The coil 40 is sufficiently adjacent to the open face 36 so that the horizontal magnetic field generated directly has sufficient strength to exert a limiting force on the molten metal contained in the gap 35.

The leak restricting device 30 will be described later in detail, but has a structure that prevents the magnetic field from dispersing in a direction away from the open surface 36 of the gap 35. This structure sufficiently limits the magnetic field generated by the coil to the open face 36 of the gap.

Referring to FIGS. 4 and 5, the coil 40 is comprised of a single turn facing the open face 36 of the gap 35. The coils 40 are separated by a narrow vertical space 44, and a pair of half-coils 41 and 42 are connected to each other so that the adjacent ends are conducted to each other by a connecting member 43 disposed below the coil 40. It consists of). Each half coil 41, 42 is disposed vertically and faces the open face 36 of the gap 35 and has front walls 45, 46 arranged vertically, respectively. The two front walls 45, 46 together, are electrically and electrically conductive with the coil 40 and face the open face 36 of the gap 35, and pass the magnetic field generated by the coil 40 to the open face 36. The electrical conductors of nonmagnetic materials that are close enough to each other are limited to). As shown in FIG. 6, the conductor formed by the front walls 45 and 46 is the entire area between the upper and lower portions 113 and 114 of the coil 40, except for the narrow vertical space 44. Occupies.

The front walls 43 and 46 of each half-coil 41 and 42 have their widths as the gap 35 descends along the length of the half-coil in the vertical direction in accordance with the narrowing of the opening face 36. This becomes narrower (FIG. 4, 6, 12). In other words, the conductor formed by the front walls 45 and 46 has a shape that fully satisfies the tapered shape of the open face 36 of the gap 35. The current density and the magnetic field strength to the front walls 45 and 46 are determined by the total current value across the wall divided by the wall width. As the width decreases, the current density and the magnetic field strength increase. Therefore, when a current of a given magnitude flows in the coil 40, the current density in the front walls 45 and 46 increases as the width of the front wall decreases downward. The static pressure due to the molten metal contained in the gap 35 increases as the depth is increased. However, the increased current density increases the magnetic field strength and the magnetic pressure. As a result, the configuration of the conductor formed by the front walls 45 and 46 increases the magnetic pressure associated with the magnetic field generated by the coil 40, thereby increasing the amount of molten metal contained in the gap 35. Static pressure is offset.

The conductor formed by the front walls 45 and 46 is shown in the form of an arc-shaped taper, which is a shape that converges downward. It can also be set as the shape of the triangle using the straight line which converges downward.

Each half-coil 41, 42 has an outer wall 51, 52, an inner wall 53, 54, and a rear wall 55, 56 with respective front walls 45, 46, respectively ( 14). The current flowing in the coil 40 acts to concentrate on the front walls 45 and 46 of the coil, provides a magnetoresistive return path of the magnetic field generated by the coil 40, and opens the opening surface of the gap 35 ( A pair of members made of magnetic material, extending through 36, is associated with the coil 40. The first magnetic member 48 (FIGS. 14 and 15) generally has a pair of opposing surfaces 71 and 72 (FIG. 15) arranged on a plane parallel to the rotation axis of the rolls 31 and 32. It is arranged in a flat vertical position. The half coils 41 and 42, which are vertically arranged respectively, are disposed at positions adjacent to the opposing surfaces 71 and 72 of the first magnetic member 48, and electrically insulating materials (indications in the drawings are omitted). Is electrically insulated by a thin insulating layer. The first magnetic member 48 has a front edge facing the open surface 36 of the gap 35 at a sufficiently close position as in the front walls 45 and 46 of the half coils 41 and 42. 49). The first magnetic member 48 also has a rear edge 50 in contact with the rear wall 57 of the second magnetic member 50.

The second magnetic member 50 partially surrounds the coil 40. In more detail, the second member 50 surrounds the rear walls 55 and 56 of the two half-coils 41 and 42 and has a thin insulation of an electrical insulating material (not shown in the drawing). There is a back wall 57 that is electrically insulated by layers.

The second magnetic member 50 is also enclosed adjacently along the outer periphery of each of the outer walls 51 and 52 of the respective half-coils 41 and 42, and a thin layer of electrical insulating material (not shown in the drawing). A pair of side walls 58 and 59 electrically insulated by the insulating layer are arranged at a constant distance. Each side wall 58, 59 of the second magnetic member 50 faces each of the rotary rolls 31, 32 adjacent to the outer circumferential edges 37, 38 (12-13) of the roll. There are front ends 61 and 62 (FIGS. 4 and 5).

The first magnetic member 48 and the second magnetic member 50 provide a low magnetic field resistance return passage extending through the open surface 36 of the gap 35, which is generated directly by the coil 40. It is structured to help.

In addition to the configuration described above, the leak regulating device 30 also includes a shield 65 made of a nonmagnetic conductive material. The seal 65 partially surrounds the second magnetic member 50 by the method described below, and prevents the magnetic field from being formed around the rear surface and the outer surface of the second magnetic member 50. That is, the shield 65 is a molten metal in which the portion outside the low magnetic resistance return passage of the directly generated magnetic field is accommodated in the gap 35 on the other by the front walls 45 and 46 of the coil on the one hand. Restrict to the space formed by.

The shield 65 surrounds the rear wall 57 of the second magnetic member 50 from the rear side and is electrically insulated by a thin insulating layer of electrical insulating material (not shown in the drawing). 66). The shield 65 further surrounds each of the side walls 58 and 59 of the second magnetic member 50 from the outside, and is electrically shielded by a thin insulating layer of an electrically insulating material (not shown in the drawing). A pair of side wall portions 67 and 68 are insulated from each other.

Each side wall portion 67, 68 of the seal 65 is adjacent to the adjacent side walls 58, 59 of the second magnetic member 50, and has an inner surface along the periphery of the adjacent side wall. have. The rear wall portion 66 of the seal 65 has an inner surface proximate to the rear wall 57 of the second magnetic member 50.

The seal 65 has a hollow portion, denoted by reference numerals 69 and 70 in FIG. 11, set as a passage through which the cooling fluid can be circulated through the inlet and the outlet (omitted in the figure).

4, 5, 14, and 15, the apparatus 30 further includes the half-coil 41 and 42 together with the front edge 49 of the first magnetic member 48. A fire resistant member 80 covering the front walls 45 and 46 is also included. The fire resistant member 80 has a pair of opposing edge portions 81 and 82 adjacent to each of the side walls 58 and 59 of the second magnetic member 50, respectively. In the fireproof section 80, there is also an outer surface 83 disposed perpendicularly to the same vertical plane as the front ends 61, 62 of the side walls 58, 59 of the second magnetic member 50. .

The fire resistant member 80 covers portions of the coil front walls 45 and 46 exposed to the molten metal contained in the gap 35. In the embodiment described so far, the fire resistant member 80 does not cover the front ends 61, 62 of the side walls 58, 59 of the second magnetic member 50.

As described above, the first magnetic member 48 is electrically insulated from the two half coils 45 and 46, and the second magnetic member 50 is shielded with the half coils 45 and 46. It is electrically insulated with respect to (65). As the method of insulating, the electrically insulating tape which can be wound around the magnetic members 48 and 50 which is commercially available is used. Insulation tape up to 177 (350 It must be able to withstand temperatures of) and should be a heat-resistant insulating film with a maximum thickness of 0.127 mm (0.005 in).

The coil 40 is made of a highly conductive material such as copper or a copper alloy. Each half-coil 41, 42 has a hollow portion set as a passage through which the cooling fluid circulates, which will be described in more detail below.

As shown in FIG. 12, the first magnetic member 48 has a lower portion 47 having substantially the same vertical height as the narrowest portion of the open face 36 of the gap 35. The lower portion 47 is configured by horizontally arranging a plurality of silicon steel laminated strips in which directional silicon steel, which is a conventional magnetic body, is laminated vertically. The upper portion of the first magnetic member 48 is also made of the same material, and the silicon steel laminate strip is not disposed horizontally, but may be disposed vertically.

Since the horizontally arranged silicon steel laminated strip can produce a core having less loss than the vertically arranged laminated strip, the horizontally arranged silicon steel laminated strip is used for the lower portion 47 of the first magnetic member 48. do. Ferrite or powdered iron cannot be used in the lower portion of the first magnetic member 48 because the magnetic flux saturation value of ferrite or powdered iron is much smaller than that of the oriented silicon steel. Ferrite or powdered iron may be used at the top of the magnetic element, and the magnetic field density and thus the magnetic flux density increase as the depth of the molten metal increases, and it is treated by a material having a relatively low saturation value. Can be. If the depth of the molten metal is maximum, the magnetic field density and thus the magnetic flux density are maximum, and it is necessary to use a material having a relatively high saturation value such as oriented silicon steel.

The second magnetic member 50 may be made of the same material as the magnetic material used in the electromagnet so far. In addition to the silicon steel laminated strip, the second magnetic member 50 may be made of, for example, compression molded powder iron or ferrite powder. In the case where the silicon steel sheet laminated strip is used for the second magnetic member 50, the lamination may be arranged horizontally or vertically. The latter case is preferable.

The refractory member 80 is composed of a ceramic material such as "Duraboard" ^TM 3000 or 3500, made of boron nitride or low density alumina material from Carborundum Corporation. The ceramic material used for the fireproof member 80 should have sufficient heat resistance to protect the coil 40 in the case where the magnetic field is not generated by a short circuit of the current. In this case, of course, the molten metal contained in the gap 35 tries to pour out toward the coil 40 via the open surface 36 of the gap 35. The fireproof member 80 protects the coil 40 in this case. The fireproof member 80 is sandwiched like a wedge between the front ends 61 and 62 of the second magnetic body 50, and the front walls 45 and 46 of the half-coil 41 and 42 are made of a high temperature epoxy adhesive or the like. ) Is adhered to.

The rolls 31 and 32 are preferably made of a copper alloy composed mainly of oxygen free, etc., and may contain some silver (0.07-0.12 wt.%) And phosphorus (about 0.02 wt.%) For resistance to scratches. have.

In order to bring the coil 40 as close to the open face 36 of the gap 35 as possible, a slight gap between the leak restrictor 30 and the rolls 31 and 32 is required. In this case, it is preferable that the ends of the rolls 31 and 32 be sufficiently close.

As shown in FIG. 24, the leak restrictor 30 also functions as a bus bar for conducting current to the coil 40 and provides a passage for circulating the cooling fluid into and out of the coil 40. It is supported at the appropriate position with respect to the rolls 31 and 32 by the structure to make.

As shown in FIG. 24, the pair of metal conductive members 85 and 86 electrically and structurally connected to the half-coil 41 and 42 are respectively disposed on the coil 40. As shown in FIG. The ends of each of the metal conductive members 85 and 86 spaced apart from the coil 40 are mechanically connected to a supporting structure (not shown in the drawings) and electrically connected to an AC power source (not shown in the drawings). Flanges 89 and 90 are connected. The metal conductive member 85 which is mechanically and electrically connected to the half-coil 41 is a conductive metal plate 88 in contact with the upper portion of the half-coil 41. The mechanical connection of the conductive metal plate 88 to the half-coil 41 uses a conventional mechanical fastener. A metal plate similar to the conductive metal plate 88 is used to connect the metal conductive member 86 to the half-coil 42. Although the metal plate is not shown in FIG. 24, it is arrange | positioned horizontally apart from the conductive metal plate 88 which connects the metal conductive member 85 with respect to the half-coil 41. FIG. The metal conductive members 85 and 86 are similarly arranged horizontally apart from each other. The metal conductive members 85 and 86 and the conductive metal plate 88 may be made of the same material as the coil 40.

An electric current is conducted to the half-coil 41 through the metal conductive member 85 and the conductive metal plate 88, and through the connecting member 43a and the half-coil 41, the plate above the half-coil 41 (in the drawing). The indication is omitted) and then to the metal conductive member 86. The connecting member 43a shown in FIG. 24 is located below the coil 40 rather than the back of the coil 40 like the connecting member 43 shown in FIGS. 4-7.

The metal conductive member 86 forms a mirror symmetry with the metal conductive member 85, and the half split coil 42 forms a mirror symmetry with the half split coil 41. The following description relates to the connection of the metal conductive member 85, the metal conductive member 86 has similar characteristics to the metal conductive member 85.

Extending along the side of the metal conductive member 85 is an integral inlet communicating with the distributor upper portion 93 separated from the distributor lower portion 94 by horizontally arranged inner partitions, not shown in FIG. Conduit 92. The distributor upper portion 93 is through a vertical conduit 95 which communicates with the inlet opening 96 at the top of the half split coil (FIG. 6).

The inlet opening 96 communicates with an inclined inlet passage 97 that guides the cooling fluid into the half coil 41. The inclined guide member 9 inside the half split coil first induces a cooling fluid to enter along one side of the interior of the half split coil, and then induces a cooling fluid to enter along the other side. The cooling fluid circulated through the half-coil has a vertically arranged outlet passageway 99, an outlet opening portion 100 communicating with the passageway, a distributor lower portion 94 communicating with the opening portion, and a metal conductive member 85. It is discharged through the outlet conduit 101 disposed along the side. The reference numerals 96-100 in FIG. 6 relate to the half-dividing coil 42, and the same in mirror symmetry is also given to the half-dividing coil 41.

The cooling fluid is introduced into the inlet conduit 92 of the metal conductive member 85 via an inlet attachment port 91 connected to a cooling fluid source (not shown in the figure), and from the outlet conduit 101 to the outlet attachment port ( Discharged via 102).

As the cooling fluid circulating through the coil 40, for example, a cooling water having high purity and low conductivity must be used.

The cooling fluid circulating through the connecting member 43 of the coil 40 is separated from the cooling fluid circulating through the half coils 41 and 42. The cooling fluid is introduced into the connecting member 43 via the inlet conduit 63 and is discharged from the connecting member 43 via the outlet conduit 64 (FIGS. 1 and 3). Similarly, the cooling fluid circulated through the connecting member 43a of the embodiment shown in FIG. 24 is separated from the cooling fluid circulated through the half coils 41 and 42. In the embodiment shown in FIG. 24, the cooling fluid is introduced into the connecting member 43a via the inlet conduit 103, and the outlet conduit (in the drawing is shown on the opposite side of the connecting member from the inlet conduit 103). Discharged from the connecting member 43a.

In the embodiment shown in FIG. 24, current is drawn into and withdrawn from the half coils 41 and 42 via the metal conducting members 85 and 86 disposed above the coil 40. As shown in FIG.

In this variant, the bus bar may be arranged at the bottom of each half coil 41, 42 rather than at the top, in which case the connecting member 43 or the connecting member 43a is arranged above the coil rather than at the bottom. Can be.

As described above, the side wall portions 67 and 68 of the seal 65 are close to the outer surfaces of the side walls 58 and 59 of the second magnetic member 50, and the shape thereof is different from the outer surface. There is a matching inner surface (figure 5). The cooling fluid is circulated through the internal hollow portions 69 and 70 of the seal 65 (FIG. 11) to cool the shield and to help the second magnetic member 50 to cool.

The side wall portions 67 and 68 of the seal 65 are marked together with the vertical outer surface (FIGS. 4 and 11). These outer surfaces are upwards as the inner surfaces of the side wall portions 67 and 68. From inward to bottom. In this case, the shape of the shield 65 is similar to the shape of the second magnetic member 50 (FIGS. 4 and 9). However, although the shield 65 is used in the embodiment, the inner surface of the side wall portions 67 and 68 is similarly formed along the outer surface of the side walls 58 and 59 of the second magnetic member 50. The inner surfaces of the side walls 58 and 59 of the second magnetic member 50 are similar along the outer surfaces of the outer walls 51 and 52 of the half coils 41 and 42. It is important to form a close proximity.

Referring to FIGS. 14 and 15, these diagrams show the magnetic field generated by the coil 40 in front and bottom views, indicated by cut lines along the 14-14 and 15-15 lines in FIG. 12 with arrows. It is displaying. The magnetic field enters and withdraws the magnetic members 48 and 50 in a direction perpendicular to the surface of the magnetic material. The magnetic field is generally parallel to or in contact with the surface of the nonmagnetic conductive material, such as the front wall 45 and the rolls 31 and 32 of the coil 40. The fireproof member 80 may pass through a magnetic field. The molten metal trapped inside the gap 35 is indicated by reference numeral 111 in FIG. 14 and FIG. 15, and the outer boundary of the molten metal in the open face 36 of the gap 35 is shown in FIG. 14. In FIG. 15, reference numeral 112 is used.

As mentioned above, each roll 31 and 32 has the circumferential side edge parts 37 and 38 which form the edge part of the opening face 36 of the gap 35. Each side portion 37, 38 is adjacent to a side portion, for example, a circumferential side portion 38 and an adjacent side portion portion 39 (FIGS. 14 and 15). Similarly, each of the front side walls 45 and 46 of the half coils 41 and 42 has respective outer edge portions 105 and 106 spaced horizontally from the opposite side, and each outer edge portion 105 ( There are outer edge portions 107, 108 adjacent to 106.

As shown in FIG. 12, the horizontal distance between the outer edge portions 105 and 106 of the half-coil front walls 45 and 46 is equal to the opening surface of the gap 35 at the same vertical position along the gap 35. It is longer than the horizontal distance between the two circumferential side portions 37 and 38 forming 36. Referring to FIGS. 14 and 15, each outer edge portion 107, 108 of each coil front wall 45, 46 is formed with a roll (e.g., a roll) to form a narrow space 109 therebetween. It is arrange | positioned along the axial direction from each side part part 39 of 32).

As shown in FIG. 14 and FIG. 15, the outer side portion 107 of the front wall 45 of the half-dividing coil 41 and the side edge portion 39 of the roll 32 are the openings of the gap 35. Compared to the magnetic flux density of the magnetic field extending across 36, the space 109 cooperates to increase the magnetic flux density of the magnetic field. The reason is described later. The increased magnetic flux density increases the magnetic pressure in the space 109 compared to the magnetic pressure at the open surface 36 of the gap 35, thereby preventing molten metal from flowing out of the side through the space 109. do.

The depth of penetration of a magnetic field into a nonmagnetic conductor such as the front wall of the molten metal 111 or the half-coil 41 or the roll 32 is inversely proportional to the square root of the product of the magnetic permeability multiplied by the conductivity of the conductor. The copper and copper alloy constituting the half-coil front wall 45 and the roll 32 have a much lower magnetic field penetration depth than molten steel. As a result, when the molten metal is steel, the edge portion 39 of the roll 32 and the outer edge portion of the half-coil front wall 45 than between the outer boundary line 112 and the front wall 45 of the molten metal 111. Between the portions 107 the magnetic field and magnetic flux density become more concentrated in the space 109.

The magnetic pressure generated by the magnetic field is proportional to the square of the magnetic flux density determined by the cross-sectional area of the magnetic flux. Since the magnetic field is concentrated in the space, the cross-sectional area of the magnetic flux in the space 109 is less than the cross-sectional area of the magnetic flux in the space between the coil 40 and the molten metal 111. As a result, the magnetic flux density in the space 109 is increased in comparison with the magnetic flux density between the coil 40 and the molten metal 111, whereby the magnetic pressure between the coil 40 and the molten metal 111 In comparison, the magnetic pressure in the space 109 increases.

The penetration depth of the magnetic field is also inversely proportional to the angular frequency of the alternating current. At a frequency of 3,000 Hz, the relative penetration depth of the magnetic field is about 10.9 mm in molten steel and about 1.2 mm in copper. The typical operating frequency of the coil 40 is about 3,000 Hz, and if the frequency is too low, a second recycle stream may occur in the molten metal, which is undesirable. The higher the frequency, the greater the amount of heat generated in the coil, which increases the cooling load. The operating frequency may be greater than the effective cooling capacity.

The magnetic pressure at the opposite side of the front side 49 of the first magnetic member 48 due to the direction of the magnetic field opposite the front side 49 is caused by the magnetic force elsewhere in the opening 36 of the gap 35. Lower than pressure (Figure 14). As a result, the boundary line 112 of the molten metal further protrudes outward toward the coil 40 at a position opposite to the first magnetic member 48.

As the width of the first magnetic member 48 becomes narrower, the magnetic field is less dispersed in front of the first magnetic member 48, whereby the decrease in magnetic pressure becomes smaller. If the width of the first magnetic member 48 is relatively wide, the molten metal 111 may contact the refractory member 80 at the front of the first magnetic member 48, whereby the molten metal is likely to solidify there. There is this. If the first magnetic member 48 is relatively narrow, the magnetic field is sufficiently concentrated at the front of the first magnetic member 48 to prevent molten metal from contacting the refractory member 80 at that location. The first magnetic member 48 can be as narrow as 0.020 in (0.508 mm), and the distance between the rolls 31 and 32 at the narrowest portion of the gap 35 is wide (e.g. 0.1-0.25 in, Ie 2.54-6.35 mm).

In FIG. 15, the magnetic field at the narrowest part of the gap 35 is indicated, where the magnetic pressure acting directly on the front face of the first magnetic member 48 causes the molten metal to contact the refractory member 80 at that position. Not high enough. The increased magnetic pressure at the height shown in FIG. 15 is further adjacent to the front edge 49 of the first magnetic member 48 of the space 109 in which the magnetic field is concentrated to increase the magnetic flux density. This is because the length of the magnetic passage at height is shorter.

The width of the first magnetic member 48 need not be constant along the vertical length. If the width of the first magnetic member 48 is not constant, the minimum width should be at the bottom.

16 to 23, reference numeral 130 (16, 17, 23) is a leak restricting device constructed by another embodiment of the present invention.

The leak restrictor 130 is composed of a current conducting coil 140 having a plurality of coil turns 141 arranged vertically, wound around a magnetic member 150 arranged vertically.

Each coil turn 141 faces the open face 36 of the gap 35 and includes a vertically aligned front portion 142. The alternating current is conducted through the coil 140, which directly generates a horizontal magnetic field, and since the coil 140 is adjacent to the open surface 36, the magnetic field is the front portion 142 of the coil turn 141. ) Extends through the open surface 36 of the gap 35 to the molten metal contained in the gap, and has sufficient strength to exert a limiting pressure on the molten metal contained in the gap.

As shown in FIG. 23, except for the coil turn 141 disposed farthest to the left, each coil turn 141 has a normal part 143 connected to the front part 142 of the coil turn, and a front part 142 of the coil turn. The bottom portion 144 connected to the bottom of the coil turn 141, and the rear portion 145 for connecting the bottom portion 144 of the coil turn 141 to the top portion 143 of the adjacent coil turn 141 (Fig. 17) ). As shown in FIG. 23, the coil turn disposed furthest to the left has no rear portion 145 but instead the bottom portion 144 of the coil turn communicates with the other structures described below.

The coil 140 is comprised from the copper pipe which has a hollow part through which a cooling fluid circulates. The cooling fluid enters the coil 140 via an inlet conduit 192 connected to the top portion 143 of the coil turn 1411 farthest to the right, as seen in FIG. The cooling fluid is discharged from the coil 140 via an outlet conduit 193 connected to the bottom portion 144 of the coil turn 1411 farthest to the left in FIG. In order to conduct an alternating current through the coil 140, a pair of bus bars 194 and 195 are electrically connected to the inlet conduit 192 and the outlet conduit 193, respectively.

The leakage restricting device 130 is configured to prevent the magnetic field from being dispersed in the direction away from the open surface 36 of the gap 35. This structure limits the magnetic field generated by the coil 140 to the open face 36 of the gap generally.

Referring to FIGS. 16-18 and 23, it is conductively attached to the front portion 142 of each coil turn 141 and faces the open surface 36 of the gap 35. For example, vertically disposed metal strips 148 constituting a nonmagnetic conductor made of copper or the like.

As shown in FIG. 16, the width of each metal strip 148 becomes narrower downward along the vertical length of the strip in accordance with the narrower width of the opening face 36 of the gap 35, so that the coil As current flows through 140 and metal strip 148, the current density in the metal strip increases as the width of the metal strip decreases. As described above, the static pressure due to the molten metal in the gap 35 increases as the depth increases. However, since the increased current density increases the magnetic pressure, the configuration of the conductor formed by the strip increases the magnetic pressure in accordance with the increased static pressure caused by the molten metal contained in the gap 35.

The non-magnetic conductor formed by the metal strip 148 and disposed between the coil 140 and the opening face of the gap is sufficient to limit the magnetic field generated by the coil 140 to the opening face of the gap. Adjacent enough to the direction. As shown in FIGS. 16 and 17, the conductor formed by the metal strip 148 occupies the entire area between the top portion 143 and the bottom portion 144 of each coil turn 141 in front of the coil. .

The magnetic member 150 is composed of a magnetic body, which is associated with the coil 140 and cooperates with the coil to create a low magnetic resistance return path for the magnetic field generated by the coil 140, the magnetic field being a gap ( It extends along the open face 36 of 35. As shown in FIG. 18 and FIG. 23, the magnetic member 150 has a front surface 151 facing the open surface 36 of the gap 35. Each front portion 142 of each coil turn 141 is disposed in front of the front surface 151 of the magnetic member 150. Each front portion 142 of the coil turn 141 has a pair of side surfaces 146 and 147 each covered by strips 160 and 161 of the magnetic material (FIG. 18). 161 is a metal strip attached to the front surface 151 and the front portion 142 of the magnetic member 150 in order to concentrate the current flowing through the coil turn front portion 142 of the metal strip 148. 148).

There is a thin insulating film between the front surface 151 of the magnetic member 150 and the front portion 142 of the coil turn 141. Similarly, a thin film made of an electrically insulating material between each side 146, 147 of the front portion 142 and the strips 160, 161 of the corresponding magnetic body covering the side 146, 147, respectively. There is this. The metal strips 148 abut side by side in a separated state by a thin film made of an electrically insulating material. The electrically insulating material described above is the same as that used for the leak restricting device 30 shown in FIGS. 1 to 15 to separate the coil 40 from the magnetic members 48 and 50.

The magnetic member 150 and the strips 160 and 161 of the magnetic body may be made of the same material as the magnetic material used for the magnetic members 48 and 50 of the leak restrictor 30.

Referring to FIGS. 19 and 20, the magnetic member 150 includes a rear surface 152 and a pair of side walls 153 and 154 converging downward in an arc shape in addition to the front surface 151. These side walls allow the shape of the magnetic member 150 to match the shape of the open face 36 of the gap 35. The magnetic member 150 has a cut portion 155 (FIG. 19) adjacent to the side walls 153 and 154 and passing through the bottom portion 144 of the coil turn 141. The top portion 143 of each coil turn 141 extends beyond the top portion of the magnetic member 150 (FIG. 17). As shown in FIG. 17, the front portion 142 of each coil turn 141 is disposed in front of the front surface 151 of the magnetic member 150, and the rear portion 145 of the coil turn 145 is a magnetic member. It is disposed behind the rear surface 152 of 150 and extends between the bottom portion 144 of the coil turn and the top portion 143 of the adjacent coil turn 141.

Each coil turn 141 has a vertical length that is different from the vertical length of the adjacent coil turns 141 and generally corresponds to the vertical length of the portion in which the coil turns 141 are wound in the magnetic member 150. Each of the metal strips 148 disposed vertically is disposed vertically in the same manner as the coil front portion 142 to which the metal strips 148 are electrically conductively attached. Each metal strip 148 has a pair of side edges, and the side edges of adjacent metal strips 148 are shortly interposed therebetween (FIG. 16) with an electrically insulating material to prevent electrical shorts between adjacent metal strips. Form the space where the thin film is inserted.

The length of the magnetic member 150 varies along the vertical direction of the magnetic member 150, and has a width substantially corresponding to the width of the open surface 36 of the gap 35 on the same horizontal surface. Around the magnetic member 150 is a shield 165 made of a conductive material such as copper (FIGS. 16, 17, 23). As shown in FIG. 21 and FIG. 22, the shield 165 consists of a back wall 166 and a pair of side walls 167 and 168. As shown in FIG. The rear wall 166 is cut at a portion of the reference numeral 169 so that the bottom portion 144 of the coil turn 141 can pass through the rear wall 166. The back wall 166 of the shield 165 surrounds the rear surface 152 of the magnetic member 150 and is separated by a thin film made of an electrically insulating material. Each side wall 167, 168 of the shield 165 is surrounded by a thin film made of an electrically insulating material, which is adjacent to each side wall 153, 154 converging downward of the magnetic member 150. There are separate inner surfaces 171 and 172 that converge in pairs.

The shield 165 performs the same function as the function of the leak restrictor of 130, similarly to the function of the shield 65 in the leak restrictor 30 shown in FIGS. .

Referring to FIG. 23, the side walls 153 and 154 of the magnetic member 150 have front ends 163 and 164, respectively. At these front ends, extending between the side walls performs the same function as the function of the leak regulating device 130 in the leak restricting device 30, that is, the gap ( A refractory member 180 that protects the coil 140 and the metal strip 148 from the molten metal contained in 35, the refractory member 180 between the open surface 36 of the gap 35 and the metal strip 148. Is placed on.

By the way, in the leak restricting device 130, there is also the space 181 between the fireproof member 180 and the metal strip 148. The space 181 includes a medium through which the cooling gas can pass, for example, from an air knife 182 positioned to guide the cooling gas through the space 181.

The magnetic field generated by the device 130 is horizontal across the open face 36 of the gap 35 between the front ends 163, 164 of the side walls 153, 154 in the magnetic member 150. Extends. There is a space 149 between the end 163 of the side wall 153 and the adjacent circumferential side portions 37 of the roll 31, and similarly, the end 164 of the side wall 154 and the roll ( There is also a space 149 between the circumferential side portions 38 of 32. The magnetic field concentrates in the space 149, thereby increasing the magnetic flux density and the magnetic pressure as compared with those present in the open face 36 of the gap 35. This increases the deterrent to prevent the molten metal from leaking through the space 149.

Designated by reference numeral 230 in FIGS. 25 and 26 is another embodiment of a leak limiter constructed in accordance with the present invention. The leak restrictor 230 is disposed adjacent to the open face 36 of the gap 35, similar to the leak restrictor 30 is disposed, and the leak restrictor 230 has the following differences. Except for the leak limiting device of reference numeral 30, a proximity effect is used to exert a limiting pressure on the molten metal contained in the gap 35 by a method similar to that described above.

The leak restricting device 230 includes a front half split coil 241 connected by a shorting member 243 to a rear half split coil 242 which also functions as a shield described later at the bottom end thereof. It consists of a single turn coil 240, consisting of two half coils.

The alternating current flows down from the bus line (not shown in the drawing) via the front half coil 241 and through the short circuit member 243 to the rear half coil 242 and the rear half coil 242 (the current of It acts as a return passage) and flows out of the coil 240 via another busbar (not shown in the figure) connected to the half-coil 242.

The front half coil 241 includes a front wall 245, side walls 251, 252, and a rear wall 255 that constitute the front surface portion of the coil 240. The magnetic member 250, as shown in FIGS. 4 and 5, is similar to the back wall 255 of the front half coil, similar to the corresponding wall of the coil 40 surrounded by the magnetic member 50. As shown in FIG. It is surrounded by side walls 251 and 252. A thin insulating layer (not shown in the figure) separates the magnetic member 250 from the walls 251, 252, 255 of the half-coil.

The apparatus described so far concentrates the current flowing downward through the half coil 241 to the front surface portion 245.

The shield formed by the rear half-coil 242 includes a rear wall portion 266 and a side wall portion 267 which are adjacent to the rear wall 257 and the side walls 258 and 259 of the magnetic member 250. . The thin insulating layer (not shown in the figure) separates the wall portion of the shield from the wall of the magnetic member.

The coil 240 is disposed horizontally, is constant across the entire horizontal width of the front surface portion 245 of the half split coil 241, and directly generates a magnetic field passing through the open surface 36 of the gap 35. Let's do it. The front surface portion 245 is a nonmagnetic electrical conductor facing the open face 36 of the gap and disposed close enough to the open face 36 to sufficiently limit the magnetic field to the open face of the gap.

The magnetic member 250 constitutes a low magnetic field resistance return passage of a directly generated magnetic field, which extends through the opening surface of the gap. The shield 242 is formed with one side by the front surface part 245 of the half-dividing coil 241 and the other side by molten metal accommodated in the gap 35 by the magnetic field part which is outside of the low magnetic resistance return passage. Restrict to space.

The refractory member 280 acts together with the other components of the leak restrictor 230, just as the components of the leak restrictor 30 work with the refractory member 80. The function of the fireproof member 280 is the same as that of the fireproof member 80.

The leak restricting device 230 eliminates the gap that comes from the position of the first magnetic member 48 between the half coils 41 and 42 in the horizontal magnetic field generated by the leak restricting device 30. It is different from the device 30. The leak control device 230 is disposed across the front surface portion 245 of the coil 240 as a whole, to provide a magnetic field having a more constant horizontal component than the magnetic field generated by the leak control device (30). By a more and more constant magnetic field, twice as much current as that required by the leak restrictor 30 is required by the leak restrictor 230, but the magnetic field penetrates deeper into the gap 35.

The half split coil 241 has a vertical extension portion 273 for attaching a bus bar 274 that supplies an input current to the half split coil 241. Half-coil 242 has an upper portion 275 for attaching to busbar 276 for the feedback current output from half-coil 242. The parts of the reference numerals 241 to 243 and 273 and 275 are all hollow parts. The cooling fluid circulates through the half split coils 241, 242, the short members 243, the vertical extension 273 of the half split coil 241, and the upper portion 275 of the half split coil 242. Appropriate guide members and passages for guiding the cooling fluid are installed inside all the components described so far, and their structural methods are known in the art.

Since the leak regulating device 230 does not employ a magnetic member such as the first magnetic member 48 or the like employed in the leak regulating device 30, it is easier to cool than the leak regulating device 30 in cooling. The first magnetic member 48 composed of steel plates stacked in the gaps between the half coils 41 and 42 makes it more difficult to cool the leak restricting device 30.

The foregoing detailed description has been made for clarity of understanding only, and variations will be apparent to those skilled in the art.

Claims (81)

It extends vertically between the two members arranged horizontally, and uses magnetism with a proximity effect to prevent the molten metal from leaking to the open surface 36 of the gap 35 in which the molten metal is accommodated therebetween. In the leak limiter, the leak limiter 30 is adjacent to the open face 36 of the gap 35 to directly generate a horizontal magnetic field that extends through the open face 36 of the gap 35 to the molten metal. The horizontal magnetic field is sufficiently close to the open surface 36 of the gap 35 so as to have a strength sufficient to exert a regulating pressure on the molten metal contained in the gap 35. A coil 40 having a surface portion facing the open surface 36, means for concentrating the flow of current to said surface portion of the coil 40 facing the open surface 36 of a vertically extending gap 35; And magnetic members 48 and 50 associated with the coil 40. And non-magnetic electrical conductors 45 and 46 that are electrically conductive with the surface portion, and the non-magnetic electrical conductors 45 and 46 transfer the magnetic field to the open surface 36 of the gap 35. A device for restricting leakage of molten metal using magnetism, characterized in that it comprises a means sufficiently close to the opening face 36 of the gap 35 and directed toward the opening face 36 of the gap 35. . The method of claim 1, wherein the opening face 36 of the gap 35 is arranged in a vertical plane, and the nonmagnetic conductors 45, 46 are arranged in parallel with the opening face 36 of the gap 35. Characterized in that the device. The coil 40 has upper and lower portions 113 and 114, and the nonmagnetic conductors 45 and 46 are upper and lower portions 113 and 114 of the coil 40. Device occupies the entire area between). 4. The low magnetic resistance return for the magnetic field according to any one of claims 1, 2 and 3, wherein the magnetic members (48) and (50) extend through the open surface (36) of the gap (35). And a passageway. 5. The apparatus according to claim 4, wherein the device restricts a magnetic field portion outside the low magnetic resistance return passage of the magnetic field to a space where one side is formed by molten metal on the other side by the surface portion of the coil 40. And an electrically conductive shield (65) comprising a. 5. The magnetic member of claim 4, wherein the two horizontally arranged members are two rotary rolls 31 and 32 having parallel axes, and the magnetic members are associated with the coil 140 and vertically arranged magnetic members. 150, the coil 140 is composed of a plurality of vertically disposed coil turns 141 wound around the magnetic member 150, and each coil turn 141 is formed of a gap 35. A non-magnetic electrical conductor conductively attached to the front portion 142 of each coil turn and having an open surface 36 of the gap 35. Consisting of a plurality of metal strips 148 arranged vertically toward each other, each metal strip 148 being perpendicular to the metal strip 148 in accordance with the narrowing of the opening face 36 of the gap 35. The width of the metal strip 148 decreases when a current flows through the coil 140 and the metal strip 148 by narrowing the width downward along the dimension. And wherein increasing the current density in the metal strip 148 as the. The magnetic member (150) has a front surface (151) facing the open surface (36) of the gap (35), and the front portion (142) of each coil turn (141) is a magnetic member (150). The magnetic member 150 is disposed in front of the front surface 151 of the magnetic member 150 in order to concentrate the current flowing through the front portion 142 of the metal strip 148 in each front portion 142 of the coil turn 141. A pair of side surfaces 146 and 147 extending between the front surface 151 of the metal strip 148 and the metal strip 148 attached to the front portion 142 of the coil turn, respectively covered by strips of magnetic material 160 and 161. The device characterized in that. 8. The device of claim 7, wherein the coil (140) consists of a tube through which cooling fluid can circulate. The magnetic member 150 has a rear surface 152 and a pair of downwardly converging side walls 153 to match the shape of the magnetic member 150 with the shape of the open surface of the gap 35. 154, each coil turn 141 has a top portion 143 and a bottom portion 144 connected to the front portion 142 of the coil turn 141, the front of each coil turn 141 The portion 142 is disposed in front of the front surface 151 of the magnetic member 150, the plurality of coil turns 141, the top portion 143 of the adjacent coil turns 141 and the bottom portion of the coil turns 141. And a rear portion (145) extending between (144) and disposed behind the rear surface (152) of the magnetic member (150). 10. The coil length 141 of claim 9, wherein the coil turns 141 are different from the vertical lengths of the adjacent coil turns 141, and correspond to the vertical lengths of the portions in which the coil turns 141 are wound in the magnetic member 150. Device having a. The metal strip 148 of claim 10, wherein each of the metal strips 148 disposed vertically is vertically disposed with the same length as the coil front portion 142 to which the metal strips 148 are electrically conductively attached. ) Has a pair of side edges, and the side edges of adjacent metal strips (148) form little space between the side edges. 12. An apparatus according to claim 11, wherein the spaces formed between the side edges of adjacent metal strips (148) are electrically insulated. The method of claim 8, wherein the magnetic member 150 is changed along the vertical direction of the magnetic member 150, and has a width corresponding to the width of the open surface 36 of the gap 35 on the same horizontal surface. Device. 8. Device according to claim 7, characterized in that the fire resistant member (180) is arranged between the open face (36) of the gap (35) and the metal strip (148). 15. The system of claim 14, comprising a space 181 including means through which the cooling gas can pass between the fire resistant member 180 and the metal strip 148 and means for directing the cooling gas into the space 181. Device characterized in that. 6. The device according to claim 5, wherein the surface portion of the coil (40) and the magnetic member coincide with each other. 17. The coil according to claim 16, wherein the coil is composed of a single turn coil (240), and side members (37) (38) and (38) which form sides of the open surfaces (36) of the gap (35) in each member arranged horizontally. There is a side edge portion 39 adjacent to the side edge portion, and the conductor has a pair of horizontal edge portions 105 and 106 arranged horizontally and outer side edge portions 107 and 108 adjacent to each outer edge portion, At the same vertical position along the gap 35, the two side edges 37, the horizontal distance between the two outer edges 105, 106 of the conductor, form the open face 36 of the gap 35. Greater than the horizontal distance between the 38 and each of the outer side portions 107 and 108 in the conductor are disposed away from each side portion portion 39 of the member to form a narrow space therebetween, The outer side portions 107 and 108 and the side portion portions 39 of the member are compared with the magnetic flux density of the magnetic field extending across the opening face 36 of the gap 35. W, being composed of means acting in order to increase the magnetic flux density of the magnetic field in said narrow space (109) wherein to prevent the molten metal through the narrow space 109, flowing out of the side. 18. The apparatus according to claim 17, wherein the molten metal is molten steel, and at least side portions of the conductor and the member are copper or a copper alloy. 17. An apparatus according to claim 16, wherein the coil (140) and the conductor are each composed of copper or a copper alloy. 17. The two horizontally arranged members are rotating rolls 31 and 32 with parallel axes, the coil 140 is comprised of a single turn coil 141, and the magnetic members are rolls 31. (32) and a pair of opposing surfaces (71, 72) disposed on a surface parallel to the axis of rotation, consisting of a first magnetic member 48, which is arranged in a flat and vertical state, the coil turn Has a pair of half-coils 41 and 42 disposed at positions adjacent to each opposing surface 71 and 72 of the magnetic member and electrically insulated and arranged vertically, and each half-coil 41 and 42 respectively. ) Has a front wall vertically disposed toward the open surface 36 of the gap 35, and two front walls 45 and 46 of the two half coils 41 and 42 constitute the electrical conductor. Device characterized in that. 21. The front walls 45 and 46 of each half coil 41 and 42 have a half coil 41 and 42 corresponding to the narrowing of the opening face 36 of the gap 35. As the width decreases as the width decreases along the length of the vertical direction, the current density in the front walls 45 and 46 increases as the width of the front wall decreases. Device. 22. The device according to claim 21, wherein the conductor formed by the two front walls (45) (46) has a shape that matches the shape of the opening face (36) of the gap (35). 22. Each half coil (41) (42) has an outer wall (51) (52), an inner wall (53) (54), and a rear wall (55) (56) extending between the upper and lower ends of the half coil. Device characterized in that there is. 24. The device according to claim 23, wherein the coil (40) comprises means for connecting each adjacent end of the two half-coils (41) (42) to be conductive with each other. 25. An apparatus as claimed in claim 21 or 24, wherein said coil (40) has a hollow portion that forms a passage through which a cooling fluid circulates. 24. The magnetic element of claim 23, wherein the magnetic member surrounds the back walls 55, 56 of the two half coils 41, 42 and is electrically insulated from the back walls 57 and each half coil. And a second magnetic member (50) surrounding the outer walls (51) and (52) of (41) (42) and having a pair of spaced apart side walls (58) (59) electrically insulated therefrom. Device. 27. The first magnetic member (48) according to claim 26, wherein the first magnetic member (48) has a front edge portion (49) facing the open surface (36) of the gap (35) at a position sufficiently close to the conductor and the second magnetic member (50). And a rear side portion 60 in contact with the rear wall 57 of the second side member 58, 59 of the second magnetic member 50, and side edge portions 37, 38 of the outer circumferential surface of the rolls 31, 32. ), There are front ends 61 and 62 facing the respective rotary rolls 31 and 32, and the first magnetic member 48 and the second magnetic member 50 form a low magnetic resistance return passage. And means for acting to form. 28. The shield 65 according to claim 27, wherein the shield 65 surrounds the rear wall 57 of the second magnetic member 50 from the rear and is electrically insulated from the rear wall portion 66 and the second magnetic from the outside. And a pair of side wall portions (67) (68) surrounding and respectively insulated from each side wall (58) (59) of the member (50). 29. The side wall portions (67) and (68) of the shield (65) are in close proximity to adjacent side walls (58) and (59) of the second magnetic member (50). Apparatus characterized in that there is an inner surface corresponding to the shape of and the rear wall portion (66) of the shield (65) is an inner surface in close proximity to the rear wall (57) of the second magnetic member (50). 30. The apparatus of claim 29, wherein the shield (65) has a hollow portion that forms a passage through which cooling fluid can be circulated. 30. Each side wall (58) (59) of the second magnetic member (50) is adjacent to the outer wall (51) (52) of each half-coil (41) (42), and the outer wall (51). Device according to the form of. 32. The conductor according to claim 31, wherein the conductors formed by the two front walls 45, 46 have a shape that matches the shape of the opening face 36 of the gap 35, respectively, in each of the front walls 45, 46, respectively. And an outer edge portion adjacent to the outer edge portion. 29. A fire resistant member (80) according to claim 27 or 28, which also covers the front edge (49) of the first magnetic member (48) and the front walls (45) (46) of the half-coil (41) (42). Apparatus comprising a. 34. The fire resistant member (80) has a pair of opposing edge portions (81, 82) adjacent to each side wall (58) (59) of the second magnetic member (50). Device. 35. The fire resistant member (80) has an outer surface (83) arranged vertically, each of the side surfaces (58) and (59) of the outer surface (83) and the second magnetic member (50). Apparatus characterized in that the front ends (61) (62) are arranged in the same vertical plane. 21. The first magnetic member (48) according to claim 20, wherein the first magnetic member (48) has a lower portion (47) at the same vertical height as the narrowest portion of the open face (36) of the gap (35). Apparatus characterized in that composed of a plurality of directional silicon steel arranged vertically stacked. 17. An apparatus according to claim 16, comprising means for increasing the magnetic pressure associated with the magnetic field, including the configuration of the conductor and in accordance with the increasing static pressure of molten metal contained in the gap (35). The pair of rolls according to claim 16, wherein the two horizontally arranged members are rotating rolls having a circumferential side surface forming a parallel axis and an open surface 36 of the gap 35, wherein the coils are arranged vertically. It consists of a single turn coil (240) having half coils (241, 242) of the first, the first half coil (241) is directed toward the open surface 36 of the gap 35, and constitute the electrical conductor vertically There is a front wall 245 disposed, and the second half-coil 242 is disposed behind the first half-coil 241 farther from the open surface 36 of the gap 35 than the first half-coil 241. The device characterized in that. The front wall 245 of the first half-coil 241 is lowered along the length of the half-coil in the vertical direction in accordance with the narrowing of the opening face 36 of the gap 35. The width of the front wall 245 increases as the width of the front wall 245 decreases as the current flows in the coil 240. 40. An apparatus according to claim 39, wherein the conductor formed by the front wall (245) has a shape that matches the shape of the opening face (36) of the gap (35). 39. An apparatus according to claim 38, wherein the first half coil (241) has a pair of side walls (251) (252) and a rear wall (255) extending between the upper and lower ends of the half split coil. 42. An apparatus according to claim 41, wherein the coil (240) comprises means for electrically connecting each adjacent end of the two half coils (241, 242) to each other. 43. An apparatus as claimed in claim 39 or 42, wherein at least said first half coil (241) has a hollow portion which forms a passage through which a cooling fluid can circulate. 42. The magnetic member 250 has a rear wall surrounding and electrically insulated from the rear wall 255 of the first half-coil 241 and each side wall of the first half-coil 241. (251) (252) A device, characterized in that there is a pair of side walls which are electrically insulated from and spaced apart from each other. The front end of claim 44, wherein each side wall (258) (259) of the magnetic member (250) faces each of the rotating rolls (31) (32) adjacent the outer peripheral surface side portions (37) (38) of the roll. Device characterized in that there is. 46. The shield 242 according to claim 45, wherein the shield 242 surrounds the rear wall 257 of the magnetic member 250 from the rear and is electrically insulated from the rear wall portion 266 and the magnetic member 250 from the outside. And a pair of side wall portions (267) (268) surrounding and electrically insulated from each side wall (258) (259). 48. The side wall portion of the shield according to claim 46, wherein each side wall portion 267 of the shield is proximate to an adjacent side wall of the magnetic member 250, and has an inner surface that matches the shape of the adjacent side wall. 268, the device characterized in that it has an inner surface in close proximity to the rear wall (257) of the magnetic member (250). 48. The apparatus of claim 47, wherein the shield 242 has a hollow portion defining a passageway for circulating a cooling fluid. 48. The method of claim 47, wherein each side wall 258, 259 of the magnetic member 250 is adjacent to each side wall 251, 252 of the first half-coil 241, the first half-coil 241 Device according to the shape of the side walls (251) (252). 50. The device according to claim 49, wherein the conductor formed by the first half-coil (241) has a shape that matches the shape of the opening face (36) of the gap (35). 47. A device according to claim 45 or 46, wherein the device also comprises a fire resistant member (280) covering the front wall (245) of the first half-coil (241). 52. An apparatus according to claim 51, wherein the fire resistant member (280) has a pair of opposing side edges each adjacent to each side wall (258, 259) of the magnetic member (250). 53. The fire resistant member 280 has an outer surface disposed vertically, wherein each front end of the outer surface and side walls 258, 259 of the magnetic member 250 are disposed on the same vertical plane. The device characterized in that. It extends vertically between the two members arranged horizontally, and uses magnetism with a proximity effect to prevent the molten metal from leaking to the open surface 36 of the gap 35 in which the molten metal is accommodated therebetween. In the leak control method of molten metal, the leak control method directly generates a horizontal magnetic field from the position adjacent to the open surface 36 of the gap 35 to the molten metal through the open surface 36 of the gap 35. The horizontal magnetic field at a position sufficiently close to the open surface 36 of the gap 35 so that the directly generated horizontal magnetic field has a strength sufficient to exert a regulating pressure on the molten metal contained in the gap 35. Generating magnetic flux, regulating the magnetic field to the open surface 36 of the gap 35, and for the directly generated horizontal magnetic field extending beyond the open surface 36 of the gap 35. Providing a configured low magnetic resistance return path The method of controlling the leakage of molten metal using magnetic, characterized in that consisting of steps. 55. The method of claim 54, wherein the step of generating the magnetic field provides a current conducting coil having a coil surface directed toward the open surface 36 at a position adjacent to the open surface 36 of the gap 35, directly generating the horizontal magnetic field. Conducting current to the coil (40) for generating, concentrating the flow of current to the surface of the coil facing the open surface (36) of the gap (35). 56. The method according to claim 55, wherein the portion of the directly generated magnetic field outside the low magnetic resistance return passage is restricted to a space formed by the coil surface on one side and by molten metal accommodated in the gap 35 on the other side. And comprising a step. 57. A method according to claim 56, comprising increasing the magnetic pressure associated with the magnetic field in accordance with increasing static pressure of molten metal contained in the gap (35). In the leakage limiting device of the molten metal to prevent the molten metal from leaking to the open surface 36 of the gap 35 is vertically extending between the two members arranged horizontally and the molten metal is received therebetween, The gap restriction 35 extends through the open surface 36 of the gap 35 to the molten metal and generates a horizontal magnetic field exerting a regulating pressure on the molten metal contained in the gap 35. An electrically conductive coil 40 disposed adjacent to the open face 36 of the gap 35 and having a surface portion facing the open face 36 of the gap 35, and a coil facing the open face 36 of the gap 35. And a means for concentrating the flow of current to the surface portion of 40 and consisting of a magnetic member associated with the coil 40, wherein the surface portion of the coil 40 is an open surface of the gap 35. Consisting of a non-magnetic electrical conductor 45, 46 facing 36; The conductor is made of a magnetic metal leakage limiting device, characterized in that composed of a means sufficiently adjacent to the open surface 36 of the gap 35 to limit the magnetic field to the open surface 36 of the gap 35. . 60. The method according to claim 58, wherein the opening face 36 of the gap 35 is arranged in a vertical plane, and the nonmagnetic conductors 45, 46 are arranged in parallel with the opening face 36 of the gap 35. Characterized in that the device. 59. An apparatus according to claim 58, wherein said magnetic member (48) (50) constitutes said directly generated low magnetic field resistance return passage extending through an open surface (36) of a gap (35). 61. The apparatus according to claim 60, wherein the device comprises a magnetic field portion outside the low magnetic resistance return passage of the magnetic field, the space of which is formed by molten metal on one side by the nonmagnetic electrical conductors 45 and 46. And an electrically conductive shield (65) comprising means for limiting. 62. The side portion 37 according to claim 58 or 61, wherein the coil consists of a single turn coil 40, and each member arranged horizontally forms an edge of the open face 36 of the gap 35. (38) and side edge portions 39 adjoining the side edge portions, wherein the conductor has a pair of horizontal edge portions 105 and 106 arranged horizontally and outer edge portions 107 and 108 adjacent to each outer edge portion. ) And at the same vertical position along the gap 35, the two side edges where the horizontal distance between the two outer edges 105, 106 in the conductor form the open face 36 of the gap 35 Greater than the horizontal distance between (37) and (38), and each outer side portion 107, 108 in the conductor is disposed away from each side portion portion 39 of the member to form a narrow space therebetween; The magnetic flux density of the magnetic field extending across the open face 36 of the gap 35 between the outer edge portions 107 and 108 of the conductor and the side edge portions 39 of the member. By comparison, the device is characterized in that it consists of means acting to increase the magnetic flux density of the magnetic field in the narrow space (109) to prevent molten metal from flowing out of the side through the narrow space (109). 62. The apparatus of claim 61, wherein the molten metal is molten steel and the conductors are each copper or copper alloy. 62. The apparatus of claim 61, wherein the coil and the conductor are each composed of copper or a copper alloy. 62. The device of claim 58 or 61, comprising the configuration of the conductor and comprising means for increasing the magnetic pressure associated with the magnetic field in accordance with the increasing static pressure of the molten metal contained in the gap 35. Device. 63. The rotating rolls 31 and 32 according to claim 58 or 61, wherein the two horizontally arranged members are circumferential side sides forming the parallel axis and the open face 36 of the gap 35. The coil consists of a single turn coil 240 having a pair of half coils 241 and 242 arranged vertically, and the first half coil 241 has an open surface 36 of the gap 35. Is facing, there is a front wall 245 constituting the electrical conductor and arranged vertically, and the second half split coil 242 is farther from the open face 36 of the gap 35 than the first half split coil 241. And is arranged behind the first half-coil (241). 67. The method of claim 66, wherein the front wall 245 of the first half-coil 241 is lowered along the length of the half-coil in the vertical direction in accordance with the narrowing of the opening face 36 of the gap 35. The width of the front wall 245 increases as the width of the front wall 245 decreases as the current flows in the coil 240. 68. An apparatus according to claim 67, wherein the conductor formed by the front wall (245) has a shape that matches the shape of the open surface (36) of the gap (35). 67. A device according to claim 66, wherein the first half coil (241) has a pair of side walls (251, 252) and a rear wall (255) extending between the upper and lower ends of the half split coil (241). 70. An apparatus according to claim 69, wherein the coil (24) comprises means for electrically connecting each adjacent end of the two half coils (241, 242) to each other. 70. An apparatus according to claim 69, wherein at least said first half coil (241) has a hollow portion defining a passage through which a cooling fluid can circulate. The magnetic member 250 has a rear wall 255 surrounding the rear wall 255 of the first half coil 241 and electrically insulated therefrom, and each side surface of the first half coil 241. And a pair of side walls surrounding the walls (251) (252) and electrically spaced apart from each other. 73. The front end of claim 72, wherein each side wall 258, 259 of the magnetic member 250 faces each of the rolls 31, 32 adjacent to the outer circumferential side portions 37, 38 of the roll. Device characterized in that there is. 80. The shield 242 according to claim 73, wherein the shield 242 surrounds the rear wall 257 of the magnetic member 250 from the rear and is electrically insulated from the rear wall portion 266 and the magnetic member 250 from the outside. And a pair of side wall portions (267) (268) that surround and are electrically insulated from each side wall (258) (259), respectively. 75. The side wall portion 266 of the shield according to claim 74, wherein each side wall portion of the shield is adjacent to an adjacent side wall of the magnetic member 250, and has an inner surface that matches the shape of the adjacent side wall. ) Is an inner surface in close proximity to the rear wall (257) of the magnetic member (250). 76. The method of claim 75, wherein each side wall 258, 259 of the magnetic member 250 is adjacent to each side wall 251, 252 of the first half-coil 241, the first half-coil 241 Device according to the shape of the side walls (251) (252). 77. An apparatus according to claim 76, wherein the conductor formed by the front wall (245) of the first half-coil (241) has a shape that matches the shape of the open surface (36) of the gap (35). 75. The device according to claim 74, wherein the device also comprises a fire resistant member (280) covering the front wall (245) of the first half coil (241). In the method of controlling the leakage of molten metal to prevent the molten metal from leaking to the open surface 36 of the gap 35 in which the molten metal is accommodated therebetween, extending vertically between the two members arranged horizontally, The leak control method provides a current conducting coil 40 having a coil surface facing the open surface 36 at a position adjacent to the open surface 36 of the gap 35, the open surface of the gap 35 ( Conducting a current to the coil 40 to generate a horizontal magnetic field extending through the 36 to the molten metal and exerting a regulated pressure on the molten metal contained in the gap 35, the open surface of the gap 35 ( Associating the coil 40 with the magnetic member to concentrate the flow of current in the surface portion of the coil 40 facing 36, confining the magnetic field to the open surface 36 of the gap 35, and Author composed of magnetic material for magnetic fields extending through the open side of the gap Method leakage regulation of the molten metal using a magnetic, characterized in that consisting of the steps of: providing a return passage resistance. 80. The method of claim 79, comprising regulating a portion of the magnetic field outside the low magnetic resistance return passage to a space formed by molten metal accommodated in the gap 35 on one side by the coil surface on one side. Characterized in that the method. 81. The method of claim 80, comprising increasing the magnetic pressure associated with the magnetic field in accordance with increasing static pressure of molten metal contained in the gap (35).