JP3094761B2 - Pouring pot with induction heating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pouring pot used for pouring a molten metal of a conductive metal such as cast iron, which has been received by a pouring pot from a melting furnace or the like, into a mold or the like, and particularly to induction heating. The present invention relates to a pouring pot provided with a device.

[0002]

2. Description of the Related Art Pouring pots are containers for storing, transporting, and pouring hot molten metal. The jacket of the pouring pot is made of a structural steel plate to support the weight of the molten metal, and the inner surface is lined with a refractory material to withstand the heat of the molten metal. At one location around the top of the pouring pot, a tap hole is formed to make it easier to pour the molten metal into the mold.

[0003] The molten metal melted in the melting furnace is put into a pouring pot and then transported to a place where a mold is located by a transporting means such as a crane or a hoist. There, the molten metal is poured from a pouring pot into a plurality of molds. Generally, from 10 to about 40 molds are poured with a full pot of molten metal. After the pouring pot receives the molten metal from the melting furnace, it takes about 10 to 30 minutes to finish pouring into the mold. During this time, the temperature of the molten metal continues to fall, so that it falls below the minimum temperature required for casting, and defective castings are often produced. Therefore, in order to prevent the occurrence of defective products, even if the molten metal still remains, if the temperature falls below the minimum temperature required for casting, the pouring operation is stopped there. The molten metal remaining in the pouring pot must be returned to the melting furnace, heated, and again put into the pouring pot and cast into a mold, which is a wasteful operation.

In order to eliminate the wasteful work of returning the molten metal whose temperature has dropped in this way to the melting furnace again, it is possible to heat the molten metal in advance in anticipation of the temperature drop. However, the molten metal is heated excessively. Energy is wasted. In order to solve the problem that such wasteful work is required and wasteful energy is required, there has conventionally been a pouring pot provided with an induction heating device for compensating a temperature drop of the molten metal. FIG. 7 is a front view of Conventional Example 1, and FIG. 8 is a front view of Conventional Example 2. 7 shows a normal pouring pot 71, and FIG. 8 shows a ladle-shaped pouring pot 72. In FIG. 7, a pouring pot 71 having hanging ears 74 has an inner surface of a jacket 72 lined with a refractory material 73 to store the molten metal 1, and discharges the molten metal 1 from a tap hole 75 when tilted. A groove-shaped induction heating device 76 is provided at the bottom of the pouring pot 71 to compensate for the temperature drop of the molten metal 1.
In FIG. 8, a pouring pot 81 having hanging ears 84 stores the molten metal 1 with the inner surface of a jacket 82 lined with a refractory material 83, and discharges the molten metal 1 from a tap hole 85 when tilted. A crucible-shaped induction heating device 86 is provided at the bottom of the pouring pot 71 to compensate for the temperature drop of the molten metal 1.

[0005]

In both of the above conventional examples, the temperature drop of the molten metal can be compensated, but one pouring pot requires one induction heating device, and the pouring pot is connected to the induction heating device. That is a big task. In addition, the refractory material of the induction heating device is constantly exposed to high temperatures, so it is necessary to repair the refractory material once a day, and the electric wiring and the cooling pipe to the induction heating device must be attached and detached each time. .

SUMMARY OF THE INVENTION It is an object of the present invention to compensate for a temperature drop of a molten metal, eliminate the need for an induction heating device for each pouring pot, eliminate the need for an operation of connecting the induction heating device to the pouring pot, and extend the life of the refractory material. It is to provide a pouring pot provided with a long induction heating device.

[0007]

The pouring pot provided with the induction heating device according to the first aspect of the present invention is independent of the pouring pot and independent of the pouring pot, and is provided with a flat induction coil of the induction heating device for heating the molten metal. The molten metal stored in the hot water pot is opposed to the molten metal via a gap, and when the pouring pot is tilted, the inner periphery of the pouring pot and the outer periphery of the induction heating device have a shape and an arrangement that do not interfere with each other.

At this time, a second invention is that the jacket of the pouring pot is made of a non-magnetic material, and a third invention is that a yoke is arranged on the back surface of the induction coil of the induction heating device. The invention 4 is that the induction heating device is driven at a commercial frequency, the invention 5 is that the induction heating device is provided with a vertically movable device that can move vertically, and the invention 6 is the tilting center of the pouring pot. Are located near the tap of the pouring pot.

[0009]

According to the first aspect of the present invention, since the induction heating device is separated and independent from the pouring pot, no induction heating device is required for each pouring pot, and the work of connecting the induction heating device to the pouring pot is not required. is necessary. Further, since the flat induction heating device is opposed to the molten metal of the pouring pot via a gap, the molten metal is heated to compensate for the temperature drop, and the life of the refractory material of the induction heating device is long. When the pouring pot is tilted, since the inner periphery of the pouring pot and the outer periphery of the induction heating device do not interfere with each other, even if the pouring pot is tilted by continuously pouring the mold,
The tilting can be advanced without the induction heating device hitting the pouring pot.

According to the second aspect, since the jacket of the pouring pot is a non-magnetic material, it does not prevent the magnetic flux from interlinking with the molten metal and the jacket is not heated. According to the third aspect, the yoke increases the magnetic flux density and facilitates the linkage of the magnetic flux to the molten metal. According to the fourth aspect, the electric efficiency of the induction heating device driven at the commercial frequency is high. According to invention 5, when the height from the molten metal to the induction heating device is smaller than the height from the molten metal to the upper edge of the pouring pot, the pouring pot is placed under the induction heating device once raised by the elevating device. Can be moved horizontally. According to the sixth aspect, since the tilting center is arranged near the tap, even if the molten metal decreases as the tapping continues, the surface of the molten metal determined by the tap is always constant near the tilting center. For this reason, even if the height of the center of tilt and the height of the induction heating device with respect to the floor surface are kept constant, the gap between the molten metal and the induction heating device is always kept constant and the induction heating is continued properly and properly. In addition, since the pouring pot is tilted with the vicinity of the tap hole as the center of tilt, the trajectory of the flow of the molten metal that falls naturally from the tap port almost does not change. It may be constant without adjusting the position of the mold or the like.

[0011]

1 is a front view of the first embodiment, FIG. 2 is a front view of the second embodiment, FIG. 3 is a longitudinal sectional view of the induction heating apparatus of FIG. 1 or FIG. 2, and FIG. 5 is a magnetic flux distribution diagram of FIG. 2, and FIG. 6 is a plan view of the induction coil of the third embodiment. In the conventional example and each drawing, the components denoted by the same reference numerals have approximately the same functions, and redundant description may be omitted.

In FIG. 1, an ordinary pouring pot 12 having a handle 11 for hanging ears has a casing 13 whose inner surface is made of a refractory material 14.
To store the molten metal 1 and tilt it if it tilts.
The molten metal 1 In order to compensate for the temperature drop of the molten metal 1, a flat induction coil 32 of an induction heating device 31 that is separated from the molten metal pot 12 and is independent from the molten metal pot 12 is opposed to the molten metal 1 stored in the molten metal pot 12 via a gap. When the pouring pot 12 is tilted, the inner periphery of the pouring pot 12 and the induction heating device 31
Has a shape and arrangement that do not interfere with each other.

The jacket 13 of the pouring pot 12 is made of a non-magnetic material, and a yoke 33 is disposed on the back surface of the induction coil 32 of the induction heating device 31 so that the induction heating device 31 is operated at a commercial frequency (50 or 60 Hz). Drive with The induction heating device 31 may include a vertically movable device 34 that can move in the vertical direction. The pouring pot 12 is moved by a crane or the like with a hanging ear (not shown) attached to the handle 11, placed on a fixed roller conveyor 16a, and tilted by a roller conveyor 16b. The tilting center is located on a pin 17 near the tap hole 15, and the pin 17 of the pouring pot 12 that has moved is fixed to a hook 18.
Fit in.

Embodiment 2 shown in FIG. 2 has the same structure as FIG. 1 except that the pouring pot is a ladle-shaped pouring pot 22.
Handle 11, non-magnetic jacket 23, refractory material 14, taphole 1
5. Roller conveyors 16a and 16b, a pin 17 near the tap 15 and a hook 18. A flat induction coil 32 of an induction heating device 31 is opposed to the molten metal 1.
When the pouring pot 22 is tilted, the inner periphery of the pouring pot 22 and the outer periphery of the induction heating device 31 have shapes and arrangements that do not interfere with each other. The induction heating device 31 has a yoke 33 and is driven at a commercial frequency, and has an elevating device 34 as in FIG.

According to the above two embodiments, the induction heating device 31
Is independent of the pouring pot 12 or 22, so that no induction heating device 31 is required for each pouring pot, and the work of connecting the induction heating device 31 to the pouring pot 12 or 22 is unnecessary. In addition, since the flat induction heating device 31 faces the molten metal 1 of the pouring pot 12 or 22 with a gap therebetween, the molten metal 1 is heated to compensate for the temperature drop, and the refractory material 14 of the induction heating device 31 is heated. Long service life. When the pouring pot 12 or 22 tilts, the pouring pot 12 or 22
And the outer periphery of the induction heating device 31 do not interfere with each other.
Even if 2 is tilted, the tilting can be advanced without the induction heating device 31 hitting the pouring pot.

The jacket 1 of the pouring pot 12 or 22
Since 3 or 23 is a non-magnetic material, it does not prevent the magnetic flux from interlinking with the molten metal 1 and the jacket 13 or 23 is not heated. The yoke 33 increases the magnetic flux density and facilitates the linkage of the magnetic flux to the molten metal 1. The electric efficiency of the induction heating device 31 driven at the commercial frequency is good. When the height from the melt 1 to the induction heating device 31 is smaller than the height from the melt 1 to the upper edge of the pouring pot 12 or 22, the lifting device 3
4, the pouring pot 12 or 22 can be moved horizontally below the induction heating device 31 which has been raised once. Since the tilting center is located near the tap hole 15, even if the molten metal 1 is reduced by continuing the tapping, the surface of the melt 1 whose position is determined by the tap hole 15 is always constant near the tilting center. For this reason, even if the height of the tilting center with respect to the floor surface and the height of the induction heating device 31 are kept constant, the gap between the molten metal 1 and the induction heating device 31 is always kept constant and the induction heating is continued properly and properly. I do. Also,
Since the pouring pot 12 or 22 is tilted with the vicinity of the tap hole 15 as a tilt center, the trajectory of the flow of the molten metal that falls naturally from the tap port 15 is almost unchanged. Alternatively, it may be constant without adjusting the position of the mold 19 or the like with respect to the floor surface.

Referring to FIGS. 3 and 4, the detailed structure of the induction heating device 31 will be described. The induction coil 32 has a two-stage flat plate spiral shape, and a radial yoke 33 is arranged on the back surface (upper surface) and in the horizontal direction. On the surfaces of the induction coil 32 and the yoke 33, an insulator 35 and a heat insulating material 36 are sequentially stacked. Then, a refractory castable 37 is applied to the surface and the outer periphery of the yoke 33 and the heat insulating material 36, and the surface, the outer periphery, and the back surface are surrounded by an outer frame 38 except for a part of the center of the surface. The insulator 35 is hung by the hanging hook 39 extending downward from the back surface of the outer frame 38, and the castable 37 is hung by the stopper 40. A leg 41 for the lifting device 34 is fixed to the back surface of the outer frame 38. A terminal 42 of the water-cooled induction coil 32 is drawn out from the back surface of the outer frame 38, and a cooling pipe 43 is brought into contact with the outer frame 38 to supply cooling water from outside, thereby cooling the induction heating device 31.

In the magnetic flux distribution diagram of FIG. 2 shown in FIG. 5, since the magnetic flux at the center has a high density, illustration is omitted. It can be clearly seen that the magnetic flux is linked to the molten metal 1. Frequency is 150Hz
Experiments have shown that a commercial frequency of 50 or 60 Hz has better electrical efficiency than a medium frequency of 10 kHz. Although the induction coil 60 of the third embodiment shown in FIG. 6 has a flat rectangular shape, a flat rectangular induction coil 60 may be used instead of the flat spiral induction coil 32.

[0019]

According to the pouring pot provided with the induction heating device of the first aspect, the induction heating device is separated and independent from the pouring pot. For this reason, an induction heating device is not required for each pouring pot, and the work of coupling the induction heating device to the pouring pot is unnecessary. Therefore, there is an effect that the molten metal is heated to compensate for the temperature drop and the life of the refractory material of the induction heating device is long.

In this case, according to the second aspect of the present invention, since the jacket of the pouring pot is made of a non-magnetic material, there is an effect that the magnetic flux does not interfere with the molten metal and the jacket is not heated. . According to the third aspect, the yoke has the effect of increasing the magnetic flux density and facilitating the linkage of the magnetic flux to the molten metal. According to the fourth aspect, there is an effect that the induction heating device driven at the commercial frequency has good electric efficiency. According to invention 5, when the height from the molten metal to the induction heating device is smaller than the height from the molten metal to the upper edge of the pouring pot, the pouring pot is placed under the induction heating device once raised by the elevating device. There is an effect that can be moved horizontally. According to the sixth aspect, since the tilting center is disposed near the tap, the surface of the molten metal determined by the tap is always constant near the tilting center, and the height of the tilting center with respect to the floor surface and the induction heating Even if the height of the device is kept constant, the gap between the molten metal and the induction heating device is always kept constant, so that proper induction heating can be continued. Because the pot tilts, the trajectory of the flow of the molten metal that falls naturally from the tap is almost the same, so even if the molten metal continues to drop and the molten metal decreases, without adjusting the position of the mold etc. with respect to the floor surface This has the effect of being constant.

[Brief description of the drawings]

FIG. 1 is a front view of a first embodiment.

FIG. 2 is a front view of a second embodiment.

FIG. 3 is a longitudinal sectional view of the induction heating device of FIG. 1 or 2;

FIG. 4 is a plan view partially showing an AA cross section of FIG. 3;

FIG. 5 is a magnetic flux distribution diagram of FIG. 2;

FIG. 6 is a plan view of an induction coil according to a third embodiment.

FIG. 7 is a front view of Conventional Example 1.

FIG. 8 is a front view of Conventional Example 2.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 molten metal 11 handle 12 pouring pot 13 jacket 14 refractory material 15 tap hole 16a roller conveyor 16b roller conveyor 17 pin 18 hook 19 mold 22 pouring pot 23 jacket 31 induction heating device 32 induction coil 33 yoke

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-247707 (JP, A) JP-A-51-52333 (JP, A) JP-A-48-103424 (JP, A) 125898 (JP, A) Japanese Utility Model 5-60657 (JP, U) Japanese Utility Model 60-181256 (JP, U) Japanese Utility Model Application 57-92452 (JP, U) (58) Fields surveyed (Int. ⁷ , DB name) B22D 41/015 B22D 41/05

Claims (6)

(57) [Claims] 1. The molten metal is separated and independent from a pouring pot.
Inject the flat induction coil of the induction heating device for heating
When the pouring pot is inclined, the inner periphery of the pouring pot and the outer periphery of the induction heating device have a shape and an arrangement that do not interfere with each other when the molten metal stored in the hot water pot is opposed to the molten metal via a gap. Pouring pot with induction heating device. 2. A pouring pot provided with the induction heating device according to claim 1, wherein the jacket of the pouring pot is made of a non-magnetic material. 3. A pouring pot provided with the induction heating device according to claim 1 or 2, wherein a yoke is arranged on the back surface of the flat induction coil of the induction heating device. Hot water pot. 4. A pouring pot provided with the induction heating device according to claim 1, 2 or 3, wherein the induction heating device is driven at a commercial frequency. 5. A pouring pot provided with the induction heating device according to claim 1, wherein the induction heating device for heating the molten metal has a vertically movable device capable of moving vertically. A pouring pot provided with an induction heating device. 6. A pouring pot provided with the induction heating device according to claim 1, wherein the tilting center of the pouring pot is arranged near the outlet of the pouring pot. Pouring pot equipped with an induction heating device.