JPH02241650A - Apparatus for pouring molten metal - Google Patents

Abstract

PURPOSE:To suppress lowering of molten metal temp. and to pour the clean molten metal by submerging a molten metal pot into the molten metal in a storing furnace with supporting means so that an inlet/outlet of the molten metal pot always positions under the molten metal surface and pouring the molten metal in the molten metal pot with a plunger. CONSTITUTION:By connecting the supporting arm 8 with a stand 5 set near the outside of the storing furnace 1 storing the molten metal M, the molten metal pot 13 is supported under condition of being submerged into the molten metal M in the storing furnace 1. In the molten metal pot 13, the inlet/outlet 18 of the molten metal M is arranged so as to be positioned under the molten metal M surface and a discharge hole 20 of the molten metal M is formed. The molten metal M flowing into the molten metal pot 13 from the storing furnace 1 through the inlet/output 18 with pouring means of a molten metal pouring cylinder 23 and plunger 27, is poured into a mold 2 from the discharge hole 20 according to descent of the plunger 27. By this method, the lowering of the molten metal temp. is suppressed and the clean molten metal containing no oxide can be poured into the mold.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a molten metal pouring device for pumping out various types of molten metal stored in a storage furnace and pouring it into molds, etc. in foundries and the like. be.

[Prior Art] FIGS. 14 and 15 are explanatory diagrams showing a conventional molten metal pouring method.

In the case of manual pouring, as shown in FIG.
The molten metal M in 1 was pumped out with a ladle 52 with a handle, carried to the mold (path shown), and poured from the sprue.

In the case of automatic pouring, for example, as shown in FIG.
4, the temperature is maintained by a burner 55, and the storage furnace 5
The molten metal M in 4 was poured into a pouring port 59 of a die-casting machine 58 using a ladle 57 of an automatic pouring machine 56. Note that the storage furnaces 51 and 54 are commonly referred to as holding furnaces.

In addition, when using a storage furnace such as a crucible furnace or a small molten metal holding furnace that itself has melting capability, the molten metal that has been directly melted and maintained at temperature in the storage furnace can be manually or automatically pumped out to form molds, etc. was pouring hot water into it.

[Problems to be Solved by the Invention] However, when pouring by the conventional method described above, in the case of manual pouring, the molten metal M is twice placed in the air in the middle of the transportation path between the storage furnace 51, the ladle 52, and the mold. be transferred. Also,
In the case of automatic pouring, the molten metal M is transferred in the air four times during the conveyance route from the concentrated melting furnace to the ladle storage to the storage furnace 54 to the ladle 57 to the pouring port 59 of the die casting machine 58.

Therefore, each time the molten metal M is transferred, it comes into contact with air and is oxidized, producing oxides on its surface. Then, this oxide finally flows into the mold together with the molten metal M. Moreover, since the temperature of the molten metal decreases due to contact with air each time the transition occurs, thermal energy for maintaining the temperature is consumed.

On the other hand, since the surface of the molten metal M in the storage furnace 51, 54 is always in contact with air, an oxide film m is formed there as well. This film m pumps out the molten metal (ladles 52, 57 at 7 o'clock)
When the molten metal is crushed by , a new oxide film is formed on the exposed surface of the molten metal, so that the layer of the film m becomes thicker as the number of pumping increases.

For this reason, in the case of manual pouring, it is necessary to carefully remove the oxides floating on the surface of the molten metal M and to pump out only the clean molten metal M, which is a troublesome task. Furthermore, in the case of automatic pouring, since oxides cannot be effectively removed, a relatively large amount of oxides are pumped out from the storage furnace 5]1, 54 together with the molten metal M and flow into the mold or the like.

Since the molten metal M containing oxides becomes viscous and its fluidity decreases, combustion gas such as air or mold release agent mixed into the mold during pouring may be enclosed in the mold, causing a decrease in the gas content in the mold. becomes higher. As a result, shrinkage cavities, pinholes, or blowholes occur in the cast product, resulting in insufficient pressure resistance and strength of the cast product.

Further, when oxides are mixed into the cast product, so-called hard spots are generated in the cast product, and the hard spots sometimes damage cutting blades and the like during machining of the cast product. Further, when the oxide flows into the mold, the oxide adheres to protrusions within the mold, forming an oxide layer there. When the thickness of this oxide layer increases over time, it becomes a hindrance and makes it difficult to remove the mold, and if the mold is removed forcibly, there is a risk that the cast product will be deformed or damaged.

Conventionally, attempts have been made to remove the oxides by placing a wire gauze over the pouring spout, but when reusing the returned material that has been cast in the wire gauze, the wire gauze cannot be separated and removed from the molten metal.
If the wire mesh is melted as it is, for example, the wire mesh will be corroded by the aluminum, and the iron content in the molten aluminum will increase, resulting in poor strength and cracks in the cast product.

Therefore, the main problem to be solved by the present invention is to provide a molten metal pouring device that can suppress a drop in the temperature of the molten metal and can pour clean molten metal containing no oxides into a mold or the like.

Another object of the present invention is to constantly pour a constant amount of oxide-free homogeneous molten metal into the storage furnace without being affected by fluctuations in the level of the molten metal in the storage furnace. The purpose of the present invention is to provide a molten metal pouring device that can be used.

[Means for Solving the Problems] As a means for solving the above problems, the molten metal pouring device of the present invention includes a support means installed near the outside of a storage furnace for storing molten metal, an inlet/outlet for the molten metal, and a molten metal pouring device. It has a molten metal discharge port, and the inlet/outlet is located below the surface of the molten metal in the storage furnace.
It has a molten metal pot made of a heat-resistant material that is immersed and supported in the molten metal in the storage furnace by a support means, a plunger that moves up and down in the molten metal pot, and a driving member that drives the plunger, and the molten metal pot is immersed and supported in the molten metal in the storage furnace. and pouring means for pouring the molten metal that has flowed into the molten metal pot into the mold from the discharge port as the plunger descends.

Further, the molten metal pouring device of the present invention has the following features in addition to the above solution:
A molten metal level detection means for detecting the molten metal level in the storage furnace, and a molten metal pot is driven up and down in the storage furnace based on the detection signal of the molten metal pot, and the entrance and exit of the molten metal pot is detected by the molten metal level detection means. The pot is equipped with means for raising and lowering the pot so that the pot is always positioned at a predetermined depth from the hot water level.

[Function] According to the present invention, the molten metal pot is supported by the supporting means in an immersed state within the storage furnace. Therefore, the temperature of the molten metal in the molten metal pot is maintained by the molten metal in the storage furnace. Therefore, a decrease in the temperature of the molten metal in the molten metal pot can be economically suppressed without consuming energy from a separate heat source.

When the molten metal pot is immersed and supported in the storage furnace, the molten metal in the storage furnace flows into the molten metal pot through the inlet/outlet (7).In this state, when the driving member of the pouring means is activated, The plunger is lowered inside the molten metal pot, and the molten metal in the molten metal pot is poured into the mold etc. from the discharge port.This eliminates the chance of the molten metal being transferred in the air, and there is no chance of the molten metal being transferred into the air due to contact between the air and the molten metal. Generation of oxides can be suppressed.

Moreover, when the molten metal pot is immersed and supported in the storage furnace, the inlet and outlet of the molten metal pot are always located below the surface of the molten metal in the storage furnace, so oxides floating on the surface of the molten metal can pass through the inlet and the outlet. There is no risk of hot water flowing into the interior. Therefore, clean molten metal containing no oxides can always be poured into a mold or the like.

Further, in the present invention, the molten metal level in the storage furnace is detected by the molten metal level detection means. Then, in response to the detection signal from the molten metal level detection means, the pot lifting/lowering means is activated, and the molten metal is blown away! is raised and lowered by an appropriate amount of movement within the storage furnace, so that the entrance and exit of the molten metal pot is always located at a predetermined depth from the detected molten metal surface. Therefore, even if the molten metal level in the storage furnace decreases due to pouring into the mold, etc., or even if the molten metal level in the storage furnace rises due to replenishment of molten metal, floating oxides will flow into the molten metal pot through the inlet/outlet. A constant amount of molten metal is always introduced into the molten metal pot without having to do so.

As a result, a predetermined amount of clean and homogeneous molten metal containing no oxides can be stably poured into a mold or the like.

[Example] The present invention will be explained in detail below.

FIG. 1 is a sectional view showing the molten metal pouring device according to an embodiment of the present invention with the plunger in the upper stop position, and FIG. 2 is a sectional view showing the molten metal pouring device of FIG. 1 in the lower initial position of the plunger. , FIG. 3 is a cross-sectional view of the molten metal pouring device shown in FIG. 1 with the plunger in the middle of its descent, FIG. 4 is a cross-sectional view of the molten metal pouring device of FIG. 1 with the plunger in the pouring position, and FIG. Figure 5 is a cross-sectional view of the molten metal pouring apparatus shown in Figure 1 with the plunger in the lower stop position, Figure 6 is a cross-sectional view of the molten metal pouring apparatus shown in Figure 1 with the plunger in its initial upward position, and Figure 7. is a cross-sectional view of the molten metal pouring device shown in Figure 1 at a position where the plunger is halfway up;
FIG. 8 is an explanatory diagram showing the configuration and operation of the molten metal level detection means in the molten metal pouring apparatus of FIG. 1, FIG. 9 is an explanatory diagram showing the operation of the pouring amount adjusting member in the molten metal pouring apparatus of FIG. 1, 1st
Fig. 0 is a sectional view showing another embodiment of the molten metal pot equipped with an inert gas jet nozzle in the molten metal pouring apparatus of the present invention, and Fig. 11 is a sectional view showing the molten metal level detection means in the molten metal pouring apparatus of the embodiment of the present invention. FIG. 12 is a schematic diagram showing a modified example of , and FIG. 12 is a partially omitted diagram showing another embodiment of the molten metal pouring device of the present invention configured to be able to pour molten metal into a die-casting machine from a discharge port in a direction different from that shown in FIG. 1. FIG. 13 is a partially omitted sectional view showing still another embodiment of the molten metal pouring apparatus of the present invention, which is configured to perform low-pressure casting with the discharge port facing upward.

In the figure, 1 is a storage furnace installed in a foundry or the like, and a molten metal M obtained by melting metal is stored inside the storage furnace. Reference numeral 2 denotes a mold having a sprue 2a and a cavity 2b, and is arranged so that it can be carried into and taken out from a position adjacent to the storage furnace 1 via a mounting table 3 by a roller conveyor 4.

A stand 5 of the molten metal pouring apparatus of this embodiment is erected near the outside of the storage furnace 1, and a screw shaft 6 is supported at the upper end of the stand 5 so as to be rotatable around a vertical axis. At the same time, a motor 7 for rotationally driving the screw shaft 6 is installed on the upper surface of the stand 5. The screw shaft 6 has
Support arm 8 extending horizontally towards the top of the storage furnace
A mounting plate 10 is erected on the upper surface of the intermediate portion of the supporting arm 8, and a bracket 11 is fixed to the lower surface of the distal end of the supporting arm 8. has been done.

A molten metal pot 13 made of a heat-resistant material is removably suspended and supported by a bolt 14 on the bracket 11 of the support arm 8, with most of the pot 13 immersed in the molten metal M in the storage furnace 1. . Inside the molten metal pot 13, a cylinder chamber 16 and a melt feeding chamber 17 are separated by a partition wall 15. Molten metal pot 1 on the cylinder chamber 16 side
In the side wall of 3, an entrance/exit 18 is formed diagonally downward. This inlet/outlet 18 is located below the surface of the molten metal M in the storage furnace 1 when the molten metal pot 13 is immersed.
can flow into and out of the cylinder chamber 16 through the inlet/outlet 18. At the upper end of the side wall of the molten metal pot 13 on the feeding chamber 17 side, a faucet-shaped discharge pipe 9 extending laterally beyond the storage furnace 1 is provided slightly diagonally upward. A discharge port 2o is formed to face the sprue 2a of the mold 2 from above. Further, a cap 21 is attached to the upper end opening of the hot water supply chamber 17. Note that in this embodiment, the discharge port 20
Although the discharge port 2° is formed facing downward, the discharge port 2° may be formed horizontally as shown in FIG. 12 or upwardly as shown in FIG. 13, depending on the position of the sprue 2a of the mold 2.

A pouring cylinder 23 operated by hydraulic pressure or pneumatic pressure is mounted on the mounting plate 10 of the support arm 8. A plunger 27 is connected to the piston rod 24 of the pouring cylinder 23 via a universal joint 25 and a connecting rod 26. The plunger 27 is driven up and down within the cylinder chamber 16 by the pouring cylinder 23,
The inlet/outlet 18 of the molten metal pot 13 is opened at the three-way stop position shown in FIG. 1, and kept closed between the lowering halfway position shown in FIG. It is configured.

A vertically extending screw frame 29 is connected to the piston rod 24 of the pouring cylinder 23 so as to be integrally movable via a connecting arm 30, and a pair of adjusters 31 and 32 are arranged on the screw frame 29 so that their positions can be adjusted. is screwed into the The screw frame 2
At a position close to the movement trajectory of the supporting arm 8''-
A limit switch 33 that is turned on and off by a lower regulator 32 is provided.

Further, a molten metal level detector 35 is installed on the support arm 8 to detect the level of the molten metal M in the storage furnace 1 . This hot water level detector 3
5 are screw rods 36a to 3, respectively, as shown in FIG.
An energizer 36, a lower limit hot water level detector 37, and an upper limit hot water level detector 38, which are formed by attaching conductors 36b to 38b to the lower end of 8a.
It consists of Each of the threaded rods 36a to 38a is screwed into a nut 39 fixed to the support arm 8 so that its position can be adjusted up and down. The conductor 36b of the energizer 36 is always immersed in the molten metal M in the storage furnace 1, and the conductor 37b of the lower limit level detector 37 is positioned above the conductor 36b.
However, the conductor 38b of the upper limit hot water level detector 38 is located above the conductor 37b.

Next, the operation of the molten metal pouring apparatus of this embodiment configured as described above will be explained.

In the state shown in FIG. 1, the plunger 27 is placed at the upper stop position, and the inlet/outlet 18 of the molten metal pot 13 is fully opened.
Molten metal M in the storage furnace 1 flows into the cylinder chamber 16 and the feed chamber 17 through the inlet/outlet 18. When the pouring cylinder 23 is activated in this state, the plunger 27 is lowered within the cylinder chamber 16 as the piston rod 24 protrudes. As shown in FIG. 2, in the initial state of descent of the plunger 27, the molten metal M above the lower end of the inlet/outlet 18 is pushed back into the storage furnace 1 by the plunger 27.

Then, as shown in FIG. 3, when the plunger 27 reaches the lower end of the entrance/exit 18, the plunger 27 closes the entrance/exit 18, and the inflow of the molten metal M from the storage furnace 1 into the cylinder chamber 16 is restricted. . Therefore, in this state,
A certain amount of molten metal M is stored in the molten metal pot 13.

When the plunger 27 is further lowered from the lower end of the entrance/exit port 18, as shown in FIG. The molten metal M passes through one discharge pipe, overflows from the discharge port 20, and is poured into the sprue 2a of the mold 2.

Further, as shown in FIG. 5, when the lower adjuster 32 on the screw frame 29 engages the limit switch 33 as the piston rod 24 protrudes, the pouring cylinder 23 is temporarily stopped and the plunger 27 is stopped at the lower stop position with the entrance/exit 18 kept closed. As a result, pouring of the molten metal M is stopped, and the mold 2 is filled with the set amount of molten metal M.

Subsequently, as shown in FIG. 6, the pouring cylinder 23 is reversed, and as the piston rod 24 is retracted, the plunger 27 is raised. When the plunger 27 rises, the remaining metal in the discharge pipe 19 flows back into the feeding chamber 17, and the molten metal M in the lower part of the feeding chamber 17 flows toward the cylinder chamber 18.
The hot water level in the hot water supply chamber 17 is lowered.

Then, as shown in FIG. 7, when the plunger 27 is raised to the position where it opens the inlet/outlet 18, an amount of molten metal M corresponding to the amount of previously poured metal passes through the inlet/outlet 18 and enters the cylinder chamber.
6 and is pushed up until the hot water level in the hot water supply chamber 17 is at the same level as the hot water level in the storage furnace 1. Thereafter, the plunger 27 is stopped at the upper stop position shown in FIG. 1, and the pouring operation into one mold 2 is completed.

In this way, the molten metal pouring device of this embodiment has support means by connecting the support arm 8 extending in a substantially horizontal direction to the stand 5 installed near the outside of the storage furnace 1 for storing the molten metal M. The support arm 8 supports a molten metal pot 13 made of a heat-resistant material in a immersed state in the molten metal M in the storage furnace 1, and the molten metal pot 13 has an inlet/outlet for the molten metal M in the storage furnace 1. It is provided so as to be located below the surface of the molten metal M, and forms a discharge port 20 for the molten metal M. A plunger 27 is housed inside the molten metal pot 13, and the plunger 27 is used as a pouring cylinder as a driving member. 23, and its pouring cylinder 23
The plunger 27 constitutes a pouring means, and the pouring means pours the molten metal M that has flowed into the molten metal bowl-1-3 from the storage furnace 1 through the inlet/outlet 18 as the plunger 27 descends. The structure is such that the metal is poured into the mold 2 from the discharge port 20.

Therefore, according to the molten metal pouring apparatus of the above embodiment, the molten metal pot J3 is supported by the support arm 8 in an immersed state within the storage furnace 1. Therefore, the molten metal M in the molten metal pot 3 is always kept warm by the molten metal M in the storage furnace 1. Therefore, a decrease in the temperature of the molten metal in the molten metal pot 13 can be economically suppressed without consuming energy from a separate heat source.

On the other hand, when the molten metal pot 13 is immersed and supported in the storage furnace 1, the molten metal M in the storage furnace 1 flows into the molten metal pot 13 through the inlet/outlet 18.

In this state, when the pouring cylinder 23 is activated, the plunger 27 is lowered within the molten metal pot 13, and the molten metal M in the molten metal pot 13 is poured into the mold 2 from the discharge port 20.

In this way, unlike the conventional method, there is no chance that the molten metal M is transferred in the air, and the generation of oxides due to contact between the air and the molten metal M can be suppressed.

Moreover, when the molten metal pot 13 is immersed and supported in the storage furnace 1, the inlet/outlet 18 of the molten metal pot 13 is always located below the surface of the molten metal M in the storage furnace 1, so that oxides floating on the surface of the molten metal are There is no possibility that the liquid may flow into the molten metal pot 13 through the inlet/outlet 18.

Therefore, clean molten metal M that does not contain oxides can be poured into the mold 2 at all times, and as a result, various conventional problems caused by oxides can be eliminated and the quality of cast products can be improved. can.

Further, the molten metal pouring device of this embodiment is provided with a molten metal pouring amount adjusting member that adjusts the pouring amount of the molten metal M by changing the stroke of the plunger 27 in the pouring means, and the molten metal pouring amount adjusting member is A screw rod 29 as a rod-shaped body that moves together with the jar 27, an adjuster 32 supported on the screw rod 29 so that its position can be adjusted, and detection to stop the pouring cylinder 23 by detecting the adjuster 32. It is composed of a limit switch 33 as a device.

Therefore, as shown in FIG. 9, if the vertical position of the regulator 32 with respect to the screw rod 29 is changed, the pouring cylinders 23 are stopped at different timings based on the detection signal from the limit switch 33, so that the same As shown by broken lines and chain lines in the figure, the lower stop position of the plunger 27 can be adjusted as desired. Since the amount of molten metal in the molten metal pot 13 is maintained at a constant value when the lower end of the plunger 27 reaches the lower end of the entrance/exit port 18, by appropriately adjusting the lower stop position of the plunger 27, the amount of molten metal in the mold 2 is maintained at a constant value. The amount of molten metal poured into the cavity 2a can be accurately adjusted according to the volume of the cavity 2a.

In addition, as in this embodiment, the pouring amount adjusting member is connected to the screw rod 2.
9, the regulator 32, and the limit switch 33, the pouring amount can be adjusted accurately with a simple operation, and erroneous adjustment will not occur under high temperatures. Note that if a limit switch (not shown) for detecting the upper regulator 31 is provided on the support arm 8, the upper stop position of the plunger 27 can also be adjusted.

Furthermore, in the molten metal pouring device of this embodiment, the plunger 27 of the molten metal pouring means is in the molten metal pot 1 at its upper stop position.
It is configured to open the entrance/exit 18 of No. 3 and keep the entrance/exit 18 closed between the mid-descent position and the lower stop position.

Therefore, after the lower end of the plunger 27 reaches the lower end of the inlet/outlet 18, there is no risk of the molten metal M flowing into the cylinder chamber 16 from the inlet/outlet 18, and the amount of molten metal in the molten metal pot 13 is maintained constant during pouring. This allows you to always pour hot water with the correct amount. Further, since the plunger 27 also has a valve function for opening and closing the inlet/outlet 18, the molten metal pot 13 can be easily configured without the need for a separate valve member.

Moreover, in the molten metal pouring apparatus of this embodiment, the discharge port 20 of the molten metal pot 13 is located at the tip of a beak-shaped discharge pipe 19 that extends from one end of the molten metal pot 13 to the side beyond the storage furnace 1. The molten metal M in the molten metal pot 3 overflows and is discharged into the mold 2 as the plunger 27 descends. Therefore, the molten metal M during pouring can be isolated from the outside air by the discharge pipe, and the generation of oxides can be suppressed. In addition, since the overflowing molten metal M is poured into the mold 2 from the discharge port 20,
For example, when pouring molten metal into a die-casting machine, a chill rupture layer is not generated in the molten metal that contacts the inner surface of the plunger sleeve, and the fluidity of the molten metal becomes turbulent, causing the pouring metal to act on the mold 2. Pressure decreases. As a result, the clamping pressure of the mold 2 can be reduced, making it possible to manufacture larger cast products using existing casting equipment.

In the molten metal pouring apparatus of this embodiment, the support means is connected to a stand 5 erected near the outside of the storage furnace 1 and an upper end of the stand 5 so as to extend substantially horizontally. and a support arm 8 that removably suspends and supports the molten metal pot 13, and a pouring cylinder 23 is disposed on the support arm 8.

Therefore, the stand 5 and the support arm 8 can be easily transported with the molten metal pot 13 removed from the support arm 8, and the installation of the molten metal pouring device is convenient when changing the location. Work such as maintenance inspection and cleaning can also be easily performed.

In addition, the molten metal pouring device of this embodiment has a screw shaft 6 supported rotatably around a vertical axis at the upper end of the stand 5, and a support arm that suspends and supports the molten metal pot 13 on the screw shaft 6. 8
The support arm 8 is provided with a molten metal level detector 35 for detecting the level of the molten metal M in the storage furnace 1, and the support arm 8 is mounted on the stand 5 by rotating a screw shaft 6. A motor 7 is installed as a pot lifting means for raising and lowering the molten metal pot 13 via the molten metal pot 13, and by driving the motor 7 based on the detection signal of the molten metal level detector 35, the entrance/exit 18 of the molten metal pot 35 is always kept above the detected molten metal surface. It is configured to be located at a predetermined depth.

According to this configuration, as shown in FIG. 8, when the level of the molten metal M in the storage furnace 1 falls below the lower limit level shown by the dashed line in the same figure as molten metal is poured into the mold 2, The energization between the energizer 36 and the lower limit melt level detector 37 is cut off, and based on the cutoff signal, the motor 7 is rotated in one direction, and the molten metal pot 13 is lowered via the screw shaft 6 and the support arm 8. Further, when the molten metal M level in the storage furnace 1 becomes equal to or higher than the upper limit level shown by the two-dot chain line in FIG. , the motor 7 is rotated in the opposite direction based on the energization signal, and the molten metal pot 1 is rotated in the opposite direction.
3 is raised.

Therefore, the inlet/outlet 8 of the molten metal pot 13 can always be maintained at a predetermined depth from the molten metal level without being affected by fluctuations in the molten metal level in the storage furnace 1. Therefore, there is no fear that oxides m floating on the surface of the storage furnace 1 will flow into the molten metal pot 3 through the inlet/outlet 18, and the molten metal M can always be introduced into the molten metal pot 13 at a constant depth. As a result, clean and homogeneous molten metal M containing no oxides m can be stably poured into the mold 2. In addition, in this embodiment, the stand 5
The motor 7 installed above rotates the screw shaft 6 to move the support arm 8 up and down, so the structure is solid and
A heavy molten metal pot 13 can be accurately raised and lowered in a stable state.

By the way, the molten metal pot 13 is not limited to the above embodiment, and may be configured as shown in FIG. 10.

The molten metal pot 13 shown in FIG.
a cylinder chamber 16 that accommodates the water and communicates with the inside of the storage furnace 1 via an inlet/outlet 18; A cap 21 that closes the upper end opening of the water chamber 17
and a nozzle 44 for injecting inert gas into the hot water supply chamber 17.

According to the molten metal pot 13 having this configuration, while the cap 21 seals the hot water supply chamber 17, the nozzle 44 allows the hot water to flow into the hot water chamber 17.
Since inert gas is injected into the tank, the air in the upper space of the hot water supply chamber 7 and in the discharge pipe 19 is replaced with the inert gas. Therefore, the oxidation of the molten metal M in the feed chamber 17 and the discharge pipe 19 and the mixing of air into the molten metal M are reliably prevented, and as a result, the quality of the cast product can be further improved.

In addition, as shown by the chain line in the figure, the lower end of the nozzle 44 can be immersed in the molten metal M in the hot water supply chamber 17 to perform bubbling of the inert gas.

Further, in the above embodiment, a contact type hot water level detector 35 is used as the hot water level detection means, but as shown in FIG. 11, it is also possible to use a non-contact type hot water level detector 40. be.

In FIGS. 11(a) and 11(b), the hot water level detector 40 includes a photo sensor 4 at the lower end of screw rods 41a and 42a, respectively.
It is composed of a lower limit hot water level detector 41 and an upper limit hot water level detector 42, which are provided with 1b and 42b. Figure 11(a)
In the hot water level detector 40, both photosensors 41b and 42
b are adjusted to the same height, but the lower limit hot water level detector 41
The focal point of the four-photo sensor 41b is set longer than the focal point of the photosensor 42b of the upper limit hot water level detector 42.

Furthermore, in the hot water level detector 40 shown in FIG. 11(b), the focal points of both photosensors 41b and 42b are set to be the same, but the photosensor 41b of the lower limit hot water level detector 41 is the same as that of the upper limit hot water level detector 42. It is adjusted to a lower level than the photosensor 42b. These hot water level detectors 40 also perform the same detection operation as the contact type hot water level detector 35 of the above embodiment.

In the above embodiment, the inlet/outlet 18 of the molten metal pot 13 is formed diagonally downward, but according to the present invention, the inlet/outlet 18 is always located below the surface of the molten metal.
As shown in FIG. 3, even if the inlet/outlet 18 is formed in the horizontal direction, there is no fear that the oxide m will flow into the molten metal bowl (13) from there.

Further, the direction of the discharge port 20 is not limited to the downward direction of the above embodiment, but may be formed horizontally as shown in FIG. 12. According to this molten metal pouring device, the discharge port 20 can be directly connected to the sprue 2a of the mold 2 in the die-casting machine 58, making it possible to pour molten metal in a state where air contact is almost completely cut off. Furthermore, in the molten metal pouring apparatus shown in FIG. 13, the discharge port 20 is formed upward, and the die casting machine 58
The molten metal M is poured into the sprue 2a of the mold 2 from below. According to this, since the pouring pressure is sufficiently reduced, pouring suitable for low-pressure casting can be performed.

[Effects of the Invention] As described in detail above, the molten metal pouring device of claim 1 includes support means disposed around or above the storage furnace so that the entrance and exit of the molten metal pot is always located below the molten metal surface. The molten metal pot is immersed and supported in the molten metal in the storage furnace, and in this state, the molten metal in the molten metal pot is poured into a mold etc. by the plunger of the pouring means. This has the excellent effect of suppressing the temperature drop of the molten metal by economical means, and pouring clean molten metal containing no oxides into molds, etc., thereby contributing to improving the quality of cast products.

In the molten metal pouring apparatus according to the second aspect, since the molten metal pouring means is provided with a molten metal pouring amount adjusting member, the molten metal pouring m can be accurately adjusted according to the volume of a cavity such as a mold.

In the molten metal pouring device according to the third aspect, since the molten metal pouring amount adjusting member is constituted by a rod-shaped body, a regulator, and a detector, the molten metal pouring amount can be accurately adjusted with a simple operation.

The molten metal pouring device according to claim 4 is configured such that the plunger of the molten metal pouring means continues to close the hot molten metal entrance and exit between the downward initial position and the downward stop position.
The amount of molten metal in the molten metal pot can be maintained constant and a precise amount of molten metal can be poured at all times, and the plunger can also function as a valve member, making it possible to simplify the structure of the molten metal pot.

The molten metal pouring device according to claim 5 is configured such that the molten metal pot discharge port is formed at the tip of a beak-shaped discharge pipe, and the molten metal overflows from there and is poured into a mold or the like. Oxidation of the molten metal during pouring can be suppressed, and the pouring pressure can be reduced to reduce the clamping pressure of the mold or the like.

In the molten metal pouring device according to claim 6, the support means is composed of a stand and a support arm, and the molten metal pot is removably suspended and supported on the support arm, and a driving part shrine for the pouring means is arranged. Therefore, work such as installation of the molten metal pouring device and maintenance, inspection, and cleaning of the molten metal pot can be easily performed.

The molten metal pouring device according to claim 7 is provided with a nozzle for spouting inert gas in the feeding chamber of the molten metal pot, so that oxidation of the molten metal in the feeding chamber and discharge pipe and air flowing into the molten metal are prevented. Contamination can be reliably prevented.

The molten metal pouring device according to claim 8 includes a molten metal level detector that detects the molten metal level in the storage furnace, and a molten metal pot that is raised and lowered so that the entrance and exit of the molten metal pot is always located at a predetermined depth from the detected molten metal level. Since the pot is equipped with a driving pot raising and lowering means, the molten metal is always introduced into the molten metal pot at a constant depth, and clean and homogeneous molten metal containing no oxides is stably poured into the mold etc. can do.

In the molten metal pouring device according to claim 9, the support means is composed of a stand, a screw shaft, and a support arm, and the motor of the pot lifting means is disposed on the stand, and the screw shaft is rotated by the motor. Because of its robust structure, the molten metal pot can be raised and lowered stably and accurately.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a molten metal pouring device according to an embodiment of the present invention, FIGS. 2 to 7 are sectional views showing the molten metal pouring device of FIG. 1 in different operating states, and FIG. FIG. 9 is an explanatory diagram showing the structure and operation of the molten metal level detection means in the molten metal pouring apparatus shown in FIG. 1, FIG. 9 is an explanatory diagram showing the operation of the pouring amount adjusting member in the molten metal pouring apparatus shown in FIG. FIG. 11 is a sectional view showing another embodiment of the molten metal pot in the molten metal pouring apparatus of the present invention, and FIG. and 13th
14 is a partially omitted sectional view showing another embodiment of the molten metal pouring device of the present invention in which the direction of the discharge port is different from that in FIG. 1.
1 and 15 are explanatory diagrams showing a conventional molten metal pouring method. In the figure, 1: Storage furnace, 2: Mold, 5: Stand, 6: Screw shaft, 7: Motor, 8: Support arm, 13: Molten metal pot, 16: Cylinder chamber, 17: Molten metal feeding chamber, 18: Entrance/exit, 19: discharge pipe,
20: Discharge port, 21: Cap, 23: Pouring cylinder, 27: Plunger 29: Screw frame, 32
: Adjuster, 33: Limit switch, 35.
40: Hot water level detector, 44: Nozzle. In the drawings, the same reference numerals and the same symbols indicate the same or equivalent parts.

Claims (9)

[Claims] (1) A storage furnace that stores molten metal has a support means installed near the outside, an inlet/outlet for the molten metal, and a discharge port for the molten metal, such that the inlet/outlet is located below the surface of the molten metal in the storage furnace; A molten metal pot made of a heat-resistant material is supported by the supporting means in an immersed state in the molten metal in the storage furnace, a plunger that moves up and down in the molten metal pot, and a driving member that drives the plunger, A molten metal pouring device comprising a molten metal pouring means for pouring the molten metal that has flowed into the molten metal pot through the inlet/outlet from the discharge port as the plunger descends. (2) The molten metal pouring device according to claim 1, wherein the molten metal pouring means further includes a molten metal pouring amount adjusting member that adjusts the amount of molten metal poured by changing the stroke of a plunger. (3) The pouring amount adjusting member includes a rod-shaped body that moves together with the plunger, a regulator supported on the rod-shaped body so that its position can be adjusted, and detects the regulator and stops the drive member. 3. The molten metal pouring apparatus according to claim 2, further comprising a detector. (4) The plunger of the pouring means opens the inlet/outlet of the molten metal pot at its upper stop position, and continues to close the inlet/outlet between the lower stop position and the lower stop position. The molten metal pouring device according to claim 2 or claim 3. (5) The discharge port of the molten metal pot is formed at the tip of a faucet-shaped discharge pipe that extends from the upper end of the molten metal pot to the side beyond the storage furnace, and as the plunger of the pouring means descends,
2. The molten metal pouring device according to claim 1, wherein the molten metal in the molten metal pot overflows and is discharged into a mold or the like. (6) The support means is connected to a stand that is erected near the outside of the storage furnace, and is connected to the upper end of the stand so as to extend in a substantially horizontal direction, and the molten metal pot is removably suspended and supported at the tip. 2. The molten metal pouring apparatus according to claim 1, wherein the molten metal pouring device comprises a support arm, and a driving member of the pouring means is disposed on the support arm. (7) The molten metal pot further includes a cylinder chamber that accommodates the plunger of the pouring means and communicates with the inside of the storage furnace through the inlet/outlet, and a lower end that communicates with the cylinder chamber and an upper end that communicates with the inside of the storage furnace. 2. The hot water supply chamber according to claim 1, further comprising a hot water supply chamber connected to a discharge port, a cap for closing an upper end opening of the hot water supply chamber, and a nozzle for injecting an inert gas into the hot water supply chamber. Molten metal pouring equipment. (8) A storage furnace that stores molten metal has a support means installed near the outside, an inlet/outlet for the molten metal, and an outlet for the molten metal, and the inlet/outlet is located below the surface of the molten metal in the storage furnace. , a storage furnace comprising: a molten metal pot made of a heat-resistant material supported by the support means in an immersed state in the molten metal in the storage furnace; a plunger that moves up and down within the molten metal pot; and a drive member that drives the plunger; molten metal pouring means for pouring the molten metal that has flowed into the molten metal pot through the inlet/outlet from the outlet into the mold from the discharge port as the plunger descends; and a molten metal level detection unit for detecting the level of the molten metal in the storage furnace. and driving the molten metal pot up and down in the storage furnace based on the detection signal of the molten metal level detection means, so that the entrance and exit of the molten metal pot is always positioned at a predetermined depth from the molten metal surface detected by the molten metal level detection means. A molten metal pouring device characterized by comprising a pot elevating means. (9) The support means includes a stand installed near the outside of the storage furnace, a screw shaft supported at the upper end of the stand so as to be rotatable about a vertical axis, and a screw shaft extending approximately horizontally to the screw shaft. and a support arm that suspends and supports the molten metal pot at its tip, and the pot lifting means has a motor that rotationally drives the screw shaft, and the motor is mounted on the stand. The molten metal pouring device according to claim 8, wherein the molten metal pouring device is installed in a molten metal pouring device.