JPH05237637A - Device for cooling molten metal - Google Patents

Abstract

PURPOSE:To efficiently cool a mold by atomizing water on the mold from water atomizing nozzles and removing vapor boundary film with blasting mechanism so that the following water drops satisfactorily reach the outer surface of the mold. CONSTITUTION:The preceding water drops atomized from the water atomizing nozzles 27 are vaporized at the same time of sticking on the outer surface of the high temp. mold 9 and form the vapor boundary films 34. At the lower part of the water atomizing nozzle 27, a receiving dish 29 for dripped water drops is arranged and the upper edge of a peripheral wall 30 in the receiving dish 29 is formed in the shape of a saw tooth 31 and the water is uniformly over-flows from the whole periphery. An air channel 32 is arranged below the receiving dish 29 and blowing-up holes 33 are opened around the receiving dish 29 in the air channel 32 so as to below up air from the surroundings of the receiving dish 29. Strong wind containing the water blown up from the blowing-up holes 33 sucks and removes the vapor boundary film 34 at the bottom surface part of the mold 9 and the water drops at the part around the mold 9 are blown off and removed. The removed vapor boundary film 34 and the hot blast of a gas burner 25 are sucked into a suction duct 36 and carried out of the system.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molten metal cooling device.

[0002]

2. Description of the Related Art In the publicly known Japanese Patent Application Laid-Open No. 48-100316, as shown in FIG. 1, an electrolytic zinc melting furnace a,
Distillation zinc melting furnace b, pumps c and d, gutters e and f, alloy metal charging machine g, stirrer h, blending furnace i, muffle furnace j, pump k, casting trough n , Turntable m, mold r, ingot transport conveyor t, and ingot unloading device s. Further, JP-A-48-99041 discloses an invention in which a large number of water spray nozzles are arranged above and below the mold in order to cool the generated ingot cast in the mold (FIG. 2). Further, in Japanese Patent Laid-Open No. 51-145427, a molten metal is poured into a mold to remove floating oxides on the surface of the molten metal, and then the surface of the molten metal is cooled with water while heating the surface of the molten metal with gas. , A method for heating and cooling a molten metal in which the upper layer is gradually cooled and solidified while heating with gas (FIG. 3).

[0003]

Among the known examples, the one shown in FIG. 3 has a structure in which a water chamber is formed on the lower surface of a mold, and cold water is supplied into the water chamber to cool the molten metal. Is
It cannot be applied to the turntable type ingot manufacturing apparatus of FIG. As a cooling device of the turntable-type ingot manufacturing apparatus of FIG. 1, as shown in FIG. 2, it has a structure of spraying water with a nozzle. Then, in the case of FIG. 2, when the preceding water droplet reaches the outer surface of the mold and adheres thereto, it is instantly evaporated by the intense heat to form a film of water vapor as shown in FIG. Those skilled in the art refer to this film as a "vapor boundary film". The vapor boundary film drifts over the area, preventing subsequent water droplets from reaching the mold, and impeding the water cooling effect. Therefore, the present invention has been devised for removing the vapor boundary film.

[0004]

According to the present invention, therefore, the water spray nozzle 27 for cooling is provided at the lower position of the mold 9, and the outer surface of the mold 9 is sprayed with the water spray nozzle 27. A molten metal cooling device having a blower mechanism for removing the vapor boundary film 34, and a pan 29 having saw teeth 31 at the upper edge of the peripheral wall 30 is provided under the water spray nozzle 27, and the periphery of the pan 29 is provided. A molten metal cooling device provided with a blow-up port 33 of the blower mechanism, and a molten metal cooling device provided with a suction duct 36 above the mold 9.
Further, the air blown from the air blowing mechanism moves up the outside of the turntable 7 for rotating the mold 9 to generate the suction duct 3
This is a molten metal cooling device which is sucked into No. 6.

[0005]

EXAMPLE FIG. 5 shows the whole of the present invention, in which 1 is a blending and forming gold furnace (hereinafter simply referred to as “furnace”), such as an electrolytic zinc melting furnace a provided separately as well known (see FIG. 1). Molten zinc metal is injected from a distillation zinc melting furnace b through a pump and a gutter, and a desired amount of an alloy metal such as aluminum, antimony, cadmium, or misch metal is supplied from an alloy metal charging machine g. It is a furnace that is used to produce mixed gold. The present invention illustrates a state in which three furnaces are provided although one furnace can be used, and 2 is a furnace having the same structure as the furnace 1 and 3 is a furnace having the same structure as the furnace 1. .. 4 is the furnace 1
Is a pump provided in the furnace, 5 is a pump provided in the furnace 2, and 6 is a pump provided in the furnace 3.

Reference numeral 7 denotes an ingot manufacturing turntable, which is intermittently rotated about a central shaft 8 by a motor (not shown). About 16 molds 9 are radially arranged on the turntable 7, and the turntable 7 is intermittently rotated by the space between the molds 9. Mold 9
Is a casting position, the next is the residue removal position, the next 4 frames are heating water cooling positions, the next 2 frames are air cooling positions, and the next 2 frames are water. It is a spraying position, the next is a cooling position, the next is a shower position,
The next is the die-cutting position, and the next three frames are the preheating positions.

The furnace 1 is provided with a casting trough 10 for flowing the molten metal pumped up by the pump 4 to the casting mold 9 located at the casting position. A tip injection part 11 is provided at the tip of the casting trough 10 so as to be vertically movable by a vertically moving device 12 having an arbitrary structure. Reference numeral 13 denotes a casting trough for pouring the mixed gold drawn up by the pump 5 of the furnace 2 into the casting mold 9 located at the casting position. At the tip of the casting trough 13, the tip injection part 14 is a vertical movement device 15 having an arbitrary structure. Is provided so that it can be moved up and down. Reference numeral 16 is a casting trough that pours the mixed gold drawn up by the pump 6 of the furnace 3 into the casting mold 9 located at the casting position. Is provided so that it can be moved up and down. Further, 19 is a stock conveyor, in FIG. 6, 20 is a rotating shaft, 21 is a tip opening portion, 22 is an inner partition plate, and 23 is an outer partition plate.

According to the present invention, however, even if the residue is removed at the residue removing position as described above, the metal which has not been completely oxidized but is oxidized to some extent is precipitated and floated to become an oxide. Therefore, in order to remove this, only the upper layer part (about 30 mm to 150 mm) of the molten metal in the mold 9 can be formed as a molten layer 24 that does not solidify on the upper surface side of the mold 9 at the heating water cooling position. A desired number of burner nozzles 25 are arranged. On the lower surface side, a desired number of water spray nozzles 27 having only the lower layer of the molten metal in the mold 9 as the solidified layer 26 are arranged. The mold 9 has a slight gap 28 on the turntable 7.
Since it is fixed by placing, the turntable 7 is rotated to move between the heating burner nozzle 25 and the water spray nozzle 27.

At the bottom of the water spray nozzle 27,
A water drop tray 29 is provided. There is no drain in the saucer 29,
The entire upper edge of the peripheral wall 30 is made to have saw teeth 31 so as to uniformly overflow the entire circumference. Below the saucer 29 is a wind tunnel 32.
The wind tunnel 32 opens a blow-up port 33 around the pan 29 so that the wind tunnel 32 blows up from around the pan 29. Then, the wind blown up from the blow-up port 33 sucks the vapor boundary film 34 on the bottom surface of the mold 9, and blows off the vapor boundary film 34 on the surrounding portion. Reference numeral 35 is a blower, 36 is a suction duct provided above the mold 9, and 37 is a suction device. Ideally, the wind tunnel 32 and the suction duct 36 are provided at all of the four heated water cooling positions in FIG. 5, but it is preferable to provide them at least at the front two frames.

FIG. 8 is a modification of FIG. The device of FIG. 7 will be inspected during operation. The inspection work is usually performed by riding on the turntable 7 and peeping from above. At that time, the glasses used for danger prevention may be clouded by the steam blown up from the gap 28. In FIG. 8, this is prevented by eliminating the gap 28, and the wind blown up from the blow-up port 33 around the pan 29 blows off the vapor boundary film 34 on the bottom surface of the mold 9 and then the turntable 7 Is blown up from the outer peripheral edge of the suction duct 36 and guided by the waterproof wall 38.
Is sucked in and is removed by the suction device 37. 39 is an anterior membrane. It should be noted that the suction duct 36 may be provided entirely except for the casting position, the residue removing position, the die cutting position, and the preheating position.

[0011]

[Operation] Next, the operation will be described. 1 due to the nature of the factory
... or several furnaces 1, 2, ... Are arranged, and each of the furnaces 1, 2, ... Is filled with a molten metal of zinc ingot or mixed gold having a different alloy component and kept in a heated state. The operation in the case of using three furnaces in FIG. 5 will be described. For example, when an ingot of zinc ingot is ordered, since the furnace 1 is for zinc ingot, the vertical moving device of the furnace 2 is used. 15 and the vertical movement device 18 of the furnace 3 are operated to make the casting trough 13 and the casting trough 16
The tip injection parts 14 and 17 of the casting gutter 10 are moved upward by the upper and lower parts of the casting trough 10 by the vertical movement device 12 of the furnace 1 while keeping the furnaces 2 and 3 electrically heated but keeping the molten alloy from flowing out. When only the molten metal 11 is moved downward to face the mold 9 located at the casting position and the pump 4 is operated to pump up the molten zinc metal in the furnace 1, the molten zinc metal flows in the casting trough 10 and the tip is Molten metal is poured into the mold 9 at the pouring position from the tip end opening 21 of the pouring part 11. The molten metal poured is the tip opening 2
When it flows out from No. 1, since it rises in the vicinity thereof, metal oxides are generated on the molten metal surface in the vicinity.
Therefore, the oxide does not diffuse outward, and the inner and outer partition plates 2
It collects inside 2,23.

Then, the turntable 7 is rotated to
The mold 9 is set at the residue removing position, and the residue of the floating oxide is removed by a scraper having a residue removing mechanism having an arbitrary structure separately provided.
When the turntable 7 is rotated again and moved to the heating water cooling position, even if the residue is removed at the residue removal position, the metal that has been oxidized to a certain extent thereafter precipitates and floats up to become an oxide. In order to heat the molten metal from above with the burner nozzle 25 for heating the molten metal, the upper layer portion is the molten layer 24 and only the lower portion is the solidified cooling layer 26 by the water spray nozzle 27 so that the oxides are reduced and dissolved and redissolved. ..

When this work is performed, the preceding water droplets sprayed from the water spray nozzle 27 adhere to the outer surface of the hot mold 9 and at the same time evaporate to form the vapor boundary film 34, which is a water vapor film, as shown in FIG. In the present invention, the water spray nozzle 27 is provided with a saucer 29 for the water droplets, which is formed and prevents the subsequent water droplets from reaching the mold 9.
The upper edge of the peripheral wall 30 has saw teeth 31 as a whole so that water can be evenly overflowed from the entire circumference. A wind tunnel 32 is provided on the lower side of the pan 29. Since the blow-up port 33 is opened around the pan 29 so as to blow up, the strong wind containing the water blown up from the blow-up port 33 is removed by sucking the vapor boundary film 34 on the bottom surface of the mold 9. The portion around the mold 9 is blown off and removed.

The removed vapor boundary film 34 and the gas burner 25
Hot air is sucked into the suction duct 36 and is carried out of the system.

In the embodiment shown in FIG. 8, the table 7 is used for inspection.
Sometimes you get on top and look inside the mold 9 from above,
At that time, in order to avoid the risk of the steam blown up, the gap 28 shown in FIG. 7 between the table 7 and the mold 9 is eliminated, and the wind blown up from the blow-up port 33 around the saucer 29 is After blowing the steam boundary film 34 on the bottom surface of the mold 9, the steam is blown up from the outer peripheral edge of the turntable 7, guided by the waterproof wall 38 and sucked by the suction duct 36. Not only is it protected from the danger of, but there is no worry of clouding with steam even when using glasses.

[0016]

According to the conventional cooling device having the water spray nozzle provided on the lower surface of the mold, when the preceding water droplet reaches the outer surface of the mold and adheres thereto, it is instantly evaporated by the intense heat, and as shown in FIG. To make a vapor boundary film. This vapor boundary film drifts so as to cover it, and prevents subsequent water droplets from reaching the mold, thereby hindering the water cooling effect.

In the present invention, however, the cooling water spray nozzle 27 provided at the lower position of the mold 9 and the vapor boundary film 34 formed when the water spray nozzle 27 sprays water on the outer surface of the mold 9 are removed. Since the molten metal cooling device has a blower mechanism for cooling, the vapor boundary film 34 is removed by the blower mechanism, so that subsequent water droplets often reach the outer surface of the mold 9 and are efficiently cooled.

Further, below the water spray nozzle 27, a pan 29 having saw teeth 31 on the upper edge of the peripheral wall 30 is provided, and around the pan 29, a blow-up port 33 of the blower mechanism is provided. Therefore, the water stored in the saucer 29 overflows from between the surrounding saw teeth 31 on average, and is blown up by the blow-up port 33 of the blower mechanism to be effectively used.

Further, since the metal melt cooling device is provided with a suction duct 36 above the mold 9,
The steam and hot air blown up can be smoothly sucked and removed by the suction duct 36.

Further, since the blown air from the blower mechanism rises outside the turntable 7 for rotating the mold 9 and is sucked into the suction duct 36, the molten metal cooling device is used. Then, for inspection, even when the user looks at the inside of the mold 9 from above by riding on the table 7, it is possible to avoid the danger caused by the steam that blows up, and the wind blown up from the blow-up port 33 around the saucer 29. Blows off the vapor boundary film 34 on the bottom surface of the mold 9 and then blows up from the outer periphery of the turntable 7, is guided by the waterproof wall 38, and is sucked by the suction duct 3.
Since it is sucked into No. 6, there is an effect that it does not become cloudy even when using glasses.

[Brief description of drawings]

FIG. 1 is a plan view described in JP-A-48-100316.

FIG. 2 is a cross-sectional view described in JP-A-48-99041.

FIG. 3 is a sectional view described in JP-A-51-145427.

FIG. 4 is a state diagram of a vapor boundary film.

FIG. 5 is a layout plan view of the entire invention.

FIG. 6 is a side view of the vertical movement mechanism of the casting gutter according to the embodiment of the present invention.

FIG. 7 is a vertical cross-sectional side view of the heating / cooling unit of the present invention.

FIG. 8 is a vertical sectional side view of another embodiment improved from FIG.

[Explanation of symbols]

1, 2, 3 ... Blending metal furnace, 4, 5, 6 ... Pump, 7 ... Ingot manufacturing turntable, 8 ... Center axis, 9 ... Mold,
10, 13, 16 ... Casting gutter, 11, 14, 17 ... Tip injection part, 12, 15, 18 ... Vertical movement device, 19 ... Stock conveyor, 20 ... Tip opening, 21 ... Bottom surface, 22 ... Inner partition plate, 23 ... Outer partition plate, 24 ... Molten layer, 25 ... Gas burner nozzle, 26 ... Solidification layer, 27 ... Water spray nozzle,
28 ... Gap, 29 ... Sauce, 30 ... Peripheral wall, 31 ... Sawtooth, 3
2 ... Wind tunnel, 33 ... Blow-off mouth, 34 ... Vapor boundary membrane, 35 ... Blower, 36 ... Suction duct, 37 ... Suction machine, 38 ... Waterproof wall, 39 ... Front membrane.

Front Page Continuation (72) Inventor Nobuyuki Kurata 1 3-3 Asmuta-cho, Omuta-shi, Fukuoka Mitsui Kinzoku Kiko Co., Ltd.

Claims (4)

[Claims] 1. A blower for removing a water spray nozzle 27 for cooling provided at a lower position of the mold 9 and a vapor boundary film 34 formed by water spray of the water spray nozzle 27 on the outer surface of the mold 9. Molten metal cooling device with mechanism. 2. The water spray nozzle 2 according to claim 1.
In the lower part of 7, the saucer 29 with the upper edge of the peripheral wall 30 having saw teeth 31
And a blow-up port 33 of the blower mechanism around the tray 29.
A molten metal cooling device provided with. 3. The molten metal cooling device according to claim 1, wherein a suction duct 36 is provided above the mold 9. 4. The molten metal cooling device according to claim 1, wherein the blown air from the blower mechanism rises outside a turntable 7 for rotating the mold 9 and is sucked into a suction duct 36.