JP2001121255A - Molten metal supplying apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molten metal apparatus, with which the molten metal can be supplied, even if a cast iron consisting of an outer core is not dipped into the molten metal as it is. SOLUTION: The molten metal supplying apparatus is the one, by which an electromagnetic pump 9 is dipped into a molten metal vessel 1 for storing the molten metal (a) and a small gap 6 having the interval (d) around the electromagnetic pump 9, is formed and a discharging hole 7 of the molten metal is arranged at a part of the gap 6. This interval (d) of this gap 6 is made to <=20 mm. Around the gap 6, the outer core 13 of magnetic body is not necessarily arranged, but may be arranged. In the case of arranging this outer core 13, this core may be embedded into walls 24 and 24' in the molten metal vessel 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molten metal supply apparatus for supplying molten metal to a predetermined position such as a mold in the field of casting and the like, and in particular, does not require a magnetic material as an outer core or directly immerses the same. The present invention relates to a molten metal supply device that does not need to be performed.

[0002]

2. Description of the Related Art In the field of casting, when molten metal such as aluminum is cast into a mold such as a sand mold or a mold,
The molten metal was pumped up by a ladle from a molten metal tank storing the molten metal, and was sent to a predetermined mold by its own weight or the like. Further, as another means for supplying the molten metal, an immersion type electromagnetic pump is immersed in the molten metal in the molten metal tank, and the molten metal is supplied to a predetermined mold through the electromagnetic pump. I have.

In a conventional molten metal supply apparatus using an immersion type electromagnetic pump, an electromagnetic pump is housed in a protective tube made of ceramic and immersed in a molten metal such as aluminum melted in a molten metal tank. Further, an outer core made of a cast iron, which is a magnetic material, is disposed outside the outer core.
Pressure is applied to the molten metal by the above-described electromagnetic pump to raise the level of the molten metal, and the molten metal is discharged from the discharge port. The molten metal discharged from the outlet of the electromagnetic pump is guided to a mold through a gutter or the like and cast.

In the above-mentioned conventional molten metal supply apparatus, the discharge amount of the molten metal varies depending on the height of the molten metal in the molten metal tank. Is measured and fed back to the control circuit of the electromagnetic pump to adjust the output of the electromagnetic pump.

[0005]

In the above-described conventional molten metal supply apparatus, the outer core made of cast iron must be immersed in the molten metal in a molten metal tank. The outer core made of cast iron is made of aluminum or the like. Corroded by molten metal. Therefore, measures against corrosion such as applying a ceramic coat to the outer core have been taken. However, if any part of the ceramic coat is damaged, the outer core is corroded from that part at an early stage, so that there is a problem that the outer core needs to be periodically replaced.

In view of the above-mentioned problems in the conventional molten metal apparatus, the present invention provides a molten metal apparatus capable of supplying molten metal without immersing cast iron comprising an outer core in the molten metal as it is. It is intended to do so.

[0007]

According to the present invention, as a result of study to achieve the above object, a gap 6 is formed between the electromagnetic pump 9 and the wall surface of the molten metal tank 1 and the gap d is reduced. By doing so, it has been found that the molten metal can be given a head and discharged from the molten metal tank 1 without necessarily disposing the outer core around the electromagnetic pump 9. The present invention has been made based on such attention, and forms a gap 6 between the electromagnetic pump 9 and the wall surface of the molten metal tank 1,
The distance d is reduced.

In the molten metal supply device according to the present invention, an electromagnetic pump 9 is immersed in a molten metal tank 1 containing a molten metal a, and a small gap 6 with a small distance d is formed around the electromagnetic pump 9. It is characterized in that a discharge port 7 for molten metal is provided in a part. The interval d of the gap 6 is set to 20 mm or less.

The electromagnetic pump 9 is housed inside a protective tube 8 having thermal and chemical resistance to the molten metal a.
The electromagnetic pump 9 is immersed in the molten metal bath 1 with the lower end of the protective tube 8 immersed in the molten metal a. Gap 6
It is not necessary to provide the outer core 13 made of a magnetic material around the above, but it may be provided. When this external core 13 is provided,
It is good to embed in the wall 24, 24 'of the molten metal tank 1 without immersing it in the molten metal a in the molten metal tank 1.

In such a molten metal supply apparatus according to the present invention, since the small gap 6 having the interval d of 20 mm or less is formed around the electromagnetic pump 9, even if there is no external core around the electromagnetic pump 9, , Molten metal tank 1 electromagnetic pump 9
Of the molten metal in the peripheral portion of the metal can be raised. Thus, if the molten metal outlet 7 is provided in a part of the gap 7, the molten metal in the molten metal tank 1 can be discharged from the outlet 7.

[0011]

Embodiments of the present invention will now be described specifically and in detail with reference to the drawings.
FIG. 1 schematically shows a molten metal supply device according to an embodiment of the present invention. The molten metal tank 1 is divided into a first molten metal tank 2 and a second molten metal tank 3.

The first molten metal tank 2 is composed of a room whose upper surface is closed, and an opening 12 for charging a metal ingot is provided in a part of the upper wall 10. Closed. An immersion heater 7 is arranged at the bottom of the first molten metal tank 2, whereby the molten metal in the first molten metal tank 2 is heated, and the molten state of the metal is maintained.

The second molten metal tank 3 is an open tank whose upper surface is open.
Is immersed. This electromagnetic pump 9 is of the linear induction type, and its outline is shown in FIG. That is, the electromagnetic pump 9 has an inductor 15 formed by winding a coil 17 around a stator core 16 formed of a high magnetic permeability material such as a ferrite magnetic material or a laminated steel plate. This inductor 1
Reference numeral 5 denotes a plurality of sets of coils 17 which are vertically separated by a flange provided on a stator core 16 and wound. The inductor 15 is fixed to a lower end side of an inductor support tube 19 penetrating on the center axis.

An inductor support tube 19 supporting the inductor 15 of the electromagnetic pump 9 is housed in a cylindrical protection tube 8 having a closed lower end. The coil lead 14 drawn out of the coil 17 of the electromagnetic pump 9 is drawn out of the protection tube 8 through the cover plate 21 and connected to the control power supply 4.
It is driven while being controlled by the control power supply 4.

As shown in FIG. 1, a wall 24 is formed in the second molten metal tank 3 so as to surround the electromagnetic pump 9, and a gap 6 is formed between the wall 24 and the electromagnetic pump 9. Is formed. The interval d of the gap 6 is set to d ≦ 20 mm. A discharge port 7 for discharging the molten metal a from the second molten metal tank 3 is formed in a part of the wall 24.
A gutter 27 is connected to the outlet 7, and a cavity 26 of a casting mold 25 to which the molten metal a is supplied is located ahead of the gutter 15 along a downward slope.

An outer core 13 made of a magnetic material such as cast iron is embedded in a wall 24 around the electromagnetic pump 9. The outer core 13 is made of, for example, an Fe—Co-based magnetic material having a high magnetic permeability and a high Curie point. This makes it easier to form a magnetic path around the molten metal passage 6,
Efficient operation of the electromagnetic pump 9 becomes possible. The outer core 13 is not always necessary as long as the interval d of the gap 6 is set to d ≦ 20 mm.

The liquid level gauge 5 is immersed in the molten metal a of the second molten metal tank 3 together with the electromagnetic pump 9 so that the level of the molten metal a in the second molten metal tank 3 is reduced. Height can be measured and detected. The liquid level gauge 5 is connected to the control power supply 4 and feeds back the control result to the control power supply 4 as a signal based on the detection result of the level of the molten metal.

The first and second molten metal tanks 2, 3 are connected by a flow path penetrating the bottom of the first molten metal tank 2, and a valve 19 is disposed in this flow path. It opens and closes. An electromagnetic valve is used for the valve 19.
The electromagnetic operation unit is connected to the control power supply 4 and is opened and closed while being controlled by the control power supply 4.

As shown in FIG. 1, in the molten metal supply apparatus thus configured, the first and second molten metal tanks 2, 3
The molten metal a is put into the tank, and the molten metal a is pumped up from the second molten metal tank 3 by the electromagnetic pump 9 and discharged from the discharge port 7. That is, an alternating current is applied to the electromagnetic pump 9 disposed in the second molten metal tank 3 to generate a moving magnetic field in the coil 17. As a result, a thrust is applied to the molten metal a in the portion of the gap 6 to raise the level of the molten metal a in that portion and cause the molten metal a to overflow from the discharge port 7. At this time, the output of the electromagnetic pump 9 is adjusted while the liquid level gauge 5 measures the level of the molten metal in the second molten metal tank 3.

The molten metal a discharged from a discharge port 7 provided in a part of the wall 24 of the second molten metal tank 3 is guided by a gutter 27 and sent to a cavity 26 of a mold 25. The amount of molten metal a discharged from the outlet 7 can be calculated from the cross-sectional area of the outlet 7 and the product of the level of the molten metal a pushed up above the outlet 7 by driving the electromagnetic pump 9. Therefore, this data is set up in the control power supply 4 in advance, and the drive of the electromagnetic pump 9 is controlled based on the rise of the molten metal level measured by the level meter 5, and the cavity 2 of the mold 25 is controlled.
6 is supplied with a predetermined amount of molten metal a.

Next, the embodiment of the present invention shown in FIG. 2 will be described. The molten metal supply device according to this embodiment is provided with a cylindrical shape around the electromagnetic pump 9 separately from the wall of the second molten metal tank 3. By providing a shaped wall 24 ′, a gap 6 is formed around the electromagnetic pump 9. As the wall 24 ', the same ceramic as the wall of the second molten metal tank 3 is used. The distance d of the gap 6 between the wall 24 'and the electromagnetic pump 9 is also set to d≤20 mm.

In the example shown in FIG. 2, the lower portion of the wall 24 'is formed in a double pocket shape, and the same outer wall core 13 as described above is accommodated therein. As before, wall 2
As long as the distance d between the peripheral gap 6 of the electromagnetic pump 9 formed by 4 ′ and the electromagnetic pump 9 is d ≦ 20 mm,
This external core 13 is not always necessary.

[0023]

As described above, in the molten metal supply apparatus according to the present invention, the outer core 13 is not necessarily required, and the gap d of the gap 6 around the electromagnetic pump 9 is reduced, so that the molten metal a is supplied. Supply becomes possible. This allows a free layout, such as embedding the outer core 13 in the walls 24, 24 'without immersing the outer core 13 or immersing the outer core 13 in the molten metal a. Therefore, it is possible to prevent occurrence of troubles caused by corrosion of the outer core 13 due to the molten metal a.

[Brief description of the drawings]

FIG. 1 is a schematic vertical sectional side view showing a molten metal supply device according to an embodiment of the present invention.

FIG. 2 is a schematic vertical sectional side view showing a molten metal supply device according to another embodiment of the present invention.

FIG. 3 is a schematic vertical side view showing an electromagnetic pump for adjusting the liquid level of the molten metal used in the molten metal supply device according to these embodiments.

[Explanation of symbols]

 Reference Signs List 1 molten metal tank 2 first molten metal tank 3 second molten metal tank 4 control power supply 6 gap 8 protective tube 9 electromagnetic pump 13 outer core 23 valve a molten metal

Claims (5)

[Claims] 1. A molten metal supply device for discharging a molten metal (a) from a molten metal tank (1) storing a molten metal (a) and supplying the molten metal (a) to a predetermined position. An electromagnetic pump (9) is immersed in the metal tank (1) to form a small gap (6) with a space (d) around the electromagnetic pump (9). A molten metal supply device comprising a discharge port (7). 2. The electromagnetic pump (9) is housed inside a protective tube (8) that is thermally and chemically resistant to the molten metal (a), and the lower end of the protective tube (8) is melted. The molten metal supply device according to claim 1, wherein the electromagnetic pump (9) is immersed in the molten metal tank (1) while being immersed in the metal (a). 3. The molten metal supply device according to claim 1, wherein an outer core made of a magnetic material is provided around the gap. 4. The outer core (13) includes a molten metal tank (1).
4. The molten metal supply device according to claim 3, wherein the molten metal supply device is embedded in the walls (24), (24 '). 5. The molten metal supply apparatus according to claim 1, wherein a distance (d) between the gaps (6) is 20 mm or less.