JPS63209462A - Upper trough of electromagnetic trough - Google Patents

Abstract

PURPOSE:To eliminate a distortion by induction heating of an apparatus and lengthen its life by forming both side walls and a bottom wall into an integral body by means of a castable refractory material and by providing connecting plates maintaining and reinforcing the bottom at spaces each by an even number of times as long as the pole pitch of an inductor and at a right angle to the lengthwise direction of a melt passage. CONSTITUTION:A melt passage 1 is formed into an integral body by means of a castable refractory material and its both sides are maintained by both side plates 2a, 2b of SS material. An upper trough is fitted at both ends with connecting flanges 5a, 5b for every given length. A non-magnetic connecting plate 3 is reinforced by connection of the lower edges of both side plates 2a, 2b by means of a plurality of narrow non-magnetic connecting plates 3 at right angles to the lengthwise direction of the melt passage 1. A space between said non-magnetic connecting plates 3 is an even number of times as long as the pole pitch of an inductor. Therefore, shifting magnetic fluxes passing through the non-magnetic connecting plates 3 offset each other apparently to enable elimination of a distortion by induction heating. Also, the melt passage 1 has a long life, because it is formed into an integral body and has no joint surface to generate no difference in melt.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electromagnetic gutter for transporting molten metal in a molten metal passage by the action of a moving magnetic field, and more particularly to an upper gutter of such an electromagnetic gutter.

(Prior Art) A conventional electromagnetic gutter has a sectional view of -
The molten metal passage section of the upper gutter A consists of the lower gutter B leading to the L gutter, with both side walls 1a and Ib made of castable refractory material, and the bottom wall l.
O is lined with fired fireproof boards. both side walls 1a,
The outside of Ib is held by both side plates 2a and 2b. Also,
The lower gutter B has an inductor 6 below the bottom wall 10 that has a plurality of magnetic poles along its length and generates a moving magnetic field.
This is surrounded by a stamp material 11, and furthermore, these are housed in a binding board I3. Also, both side plates 2a.

2b and the shrouding plate 13 are each fixed.

Therefore, in such a structure of the molten metal passage section, molten metal tends to form from the joint surfaces of the side walls 1a, lb and the bottom wall IO (because of this, a long service life cannot be obtained).

In addition, the fired fireproof plate used for the bottom wall 10 is a consumable item,
The disadvantage is that running costs are high.

In order to overcome these drawbacks, it is conceivable to integrally cast both side walls and the bottom wall of the molten metal passage jW< with a castable refractory material. However, in this case, in order to prevent the cast fireproof +4 from cracking, it is necessary to connect and reinforce the lower edges of both side plates 2a and 2b with non-magnetic connecting plates 12.

This condition is shown in FIG. However, since the alternating magnetic flux generated by the inductor 6 at the bottom of the connecting plate 12 passes through the connecting plate I2, the connecting plate 12, especially when made of a conductive metal plate, is heated by induction and generates heat. This is undesirable as it causes distortion.

The situation in which this moving magnetic field is generated is shown in FIG. 3(a).

(Problems that should be solved by the invention 4 degrees) The present invention has a long service life without the occurrence of hot water under the melting channel, and the connecting plate that holds and reinforces the bottom of the melting channel is also heated by the moving magnetic field. An object of the present invention is to provide an upper gutter for an electromagnetic gutter that does not cause distortion due to the electromagnetic gutter.

(Another means to solve the problem) The molten metal passage 15 of the upper gutter of the electromagnetic gutter is formed by integrally forming both side walls and the bottom wall with castable refractory material, and connecting the lower edges of both side plates to form the molten metal passage part. The connecting plates for holding and reinforcing the bottom are a plurality of narrow non-magnetic connecting plates provided perpendicularly to the length direction of the elevating channel passage at intervals of even multiples of the magnetic pole pitch of the inductor. Alternatively, this connecting plate is a plurality of non-magnetic connecting plates in which a plurality of slits are formed in parallel to the length direction of the molten metal passage portion, and the length is an even multiple of the magnetic pole pitch of the two-note reading conductor. Alternatively, this connecting plate may be a non-magnetic connecting plate in which slits are formed in the length direction of the molten metal passage section and are slightly shorter than an even multiple of the magnetic pole pitch.

(Function) The molten metal passage made integrally with castable refractory material transports the molten metal without creating a molten metal, and also allows the molten metal to pass between narrow non-magnetic connecting plates provided at an even number times the distance of the magnetic pole bits. The passing magnetic fluxes are apparently canceled out, and no current flows through the adjacent connecting plates and the two side plates. Also,
Even in a non-magnetic connecting plate with multiple slits and a length that is an even number multiple of the magnetic pole pitch, or in a single non-magnetic connecting plate with such slits, the generation of eddy currents due to the magnetic flux passing through the plate will not occur. blocked by the slit.

(Example) Fig. 1 shows an example of the upper gutter of the electromagnetic gutter of the present invention.
A), (B), and (C) are a cross-sectional view, a side view, and a bottom view, respectively. This upper gutter is different from the conventional gutter shown in FIG. 4 in that it has a molten metal passage section 1 and a connecting plate 3. Molten metal passage! is integrally formed of castable refractory material, and both sides are made of SS material (stainless steel clad II) side plates 2a,
2b, and the lower edges of both side plates 2a and 2b are connected and reinforced by a non-magnetic connecting plate 3, which will be described later. Connecting flanges 5a and 5b are attached to both ends of the upper gutter every predetermined length. Further, although the illustrated upper gutter has a uniform thickness, the thickness may be the same at both ends, or the bottom surface may be tapered and inclined. The structure of the lower trough including the inductor is similar to the conventional one shown in FIG. 4 or 5.

As shown in FIG. 1(c), the non-magnetic connecting plate 3 has a plurality of narrow non-magnetic plates arranged at right angles to the length direction of the molten metal passage 1'''4 on the lower edges of the side plates 2a, 2b. They are connected by a connecting plate 3, and the bottom of the molten metal passage section l is held and reinforced.As shown in FIG. L', etc., is an even number multiple of the magnetic pole pitch τ, for example, twice 2τ.
As shown in (a), the moving magnetic flux generated by the magnetic pole of the inductor 6 is transmitted through a loop a formed by the two non-magnetic connecting plates 3.3 and the lower edges of the two side plates 2λ and 2b, as shown in (c). -b-
The magnetic flux passing through c - d - a is in the opposite direction between the magnetic poles R, S, T and R', S', 1'' included in this loop, and appears to be canceled out by the loop. There is almost no current flowing in circulation, so the non-magnetic connecting plate 3 is not heated by induction.The length of this non-magnetic connecting plate 3 is determined by the range through which the magnetic flux passes, that is, almost Since the length may be equal to the width of the inductor 〇, the length of the non-magnetic connecting plate 3 may be minimized if mechanical strength J- is necessary.

FIG. 2 shows another embodiment, which differs from that of FIG. 1 in the structure of the nonmagnetic connecting plate. In this case, the non-magnetic connecting plate 7 is formed with a plurality of slits 8 in the longitudinal direction of the melting path rl<1.
The lower edges of b are connected, and at the same time the bottom of the molten metal passage IM≦1 is held and strengthened. As shown in the figure, this non-magnetic connecting plate 7 is made of a plurality of plates each having a length that is an even number multiple, for example twice the length of the magnetic pole pitch τ. Alternatively, the non-magnetic connecting plate 3 may be omitted or a suitable mounting member may be used instead. In these cases, the length of the slit 8 is the length excluding the attachment points at both ends of the non-magnetic connecting plate 7. Therefore, even if the moving magnetic flux generated by the inductor 6 (FIG. 3) passes through this non-magnetic connecting plate 7, generation of an eddy current is prevented by the slit 8, and the slit 8 of the non-magnetic connecting plate 7 Current circulating in the loop formed by the free periphery also has very little current because the moving magnetic flux passing through this loop is apparently canceled out. Also, instead of the plurality of connecting plates shown in Fig. 2, a single connecting plate with slits is used, and the length of this slit is made slightly shorter than an even multiple of the magnetic pole pitch.
Alternatively, the configuration may be such that the mounting member is omitted.

(Effects of the Invention) Since the molten metal passage is integrally made of castable refractory material and there is no pre-joining, there is no difference in position, long life is obtained, and running costs are low. In addition, the non-magnetic connecting plate uses multiple narrow connecting plates spaced at an even number times the pitch of the magnetic poles of the inductor, so it passes through the loop formed by the lower edges of the adjacent non-magnetic connecting plates and both side plates. The moving magnetic fluxes apparently cancel each other out, there is little current flowing through this loop, and there is no induction heating and distortion. In addition, a non-magnetic connecting plate whose length is an even number multiple of the magnetic pole pitch of the inductor, or a single non-magnetic connecting plate whose slit length is slightly shorter than an even number multiple of the magnetic pole pitch, may also be placed in the length direction of the molten metal passage. Since a plurality of slits are formed in the γ row, the magnetic flux moving through the non-magnetic connecting plate is L'
The generation of eddy currents is prevented by the slits, and the moving magnetic flux passing through the loop consisting of the peripheral i'lζ without slits is also canceled out, so that no current flows through this loop.
Therefore, no induction heating occurs.

[Brief explanation of the drawing]

Figures 1 (a), (b), and (c) are a sectional view, a side view, and a bottom view of an embodiment of the J-gutter of the electromagnetic gutter of the present invention, and the second threshold (a) and (b). ) is a bottom view and a cross-sectional view of another embodiment of the present invention, FIGS.
The figure is a cross-sectional view of a conventional electromagnetic gutter, and FIG. 5 is a cross-sectional view of an electromagnetic gutter in which the molten metal passage section of FIG. 4 is redrawn. In the figure, 11. Molten metal passage section, 2a. 2b11 both side plates, 30. Non-magnetic connecting plate, 4. , molten metal, 61. Inductor, 71. Non-magnetic connecting plate, 80
．． slit. Fig. 1 (a) (c) h Fig. 2 (a) (b) Slit kotonaku,

Claims (3)

[Claims] (1) A molten metal passage section made of a refractory material having both side walls and a bottom wall integrally formed, side plates that hold both sides of the molten metal passage section, and a bottom edge of the molten metal passage section by connecting the lower edges of the both side plates. The molten metal in the molten metal passage is formed by a moving magnetic field generated by an inductor having a plurality of magnetic poles provided below the connection plate along the length of the molten metal passage. In the upper gutter of the electromagnetic gutter where molten metal is conveyed, the connecting plate includes a plurality of narrow non-magnetic connections provided perpendicular to the length direction of the molten metal passage section at intervals of an even multiple of the magnetic pole pitch of the inductor. An upper gutter of an electromagnetic gutter characterized by being made of a board. (2) A molten metal passage section made of refractory material having both side walls and a bottom wall integrally formed, side plates that hold both sides of the molten metal passage section, and a bottom edge of the molten metal passage section by connecting the lower edges of the both side plates. The molten metal in the molten metal passage is formed by a moving magnetic field generated by an inductor having a plurality of magnetic poles provided below the connection plate along the length of the molten metal passage. In the upper gutter of the electromagnetic gutter in which the molten metal is conveyed, the connecting plate has a plurality of slits formed parallel to the length direction of the molten metal passage, and a plurality of slits each having a length equal to an even multiple of the magnetic pole pitch of the inductor. An upper gutter of an electromagnetic gutter characterized by comprising a non-magnetic connecting plate. (3) A molten metal passage section made of refractory material having both side walls and a bottom wall integrally formed, side plates that hold both sides of the molten metal passage section, and a bottom edge of the molten metal passage section by connecting the lower edges of the both side plates. The molten metal in the molten metal passage is formed by a moving magnetic field generated by an inductor having a plurality of magnetic poles provided below the connection plate along the length of the molten metal passage. In the upper gutter of the electromagnetic gutter in which the molten metal is conveyed, the connecting plate is characterized by being made of a single non-magnetic connecting plate with slits formed in the length direction of the molten metal passage section slightly shorter than an even multiple of the magnetic pole pitch. The upper gutter of the electromagnetic gutter.