JP3017540B2 - Molten metal feeder - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an apparatus for quantitatively supplying a molten metal of an aluminum alloy or other various metals melted in a melting furnace and stored in a molten metal holding furnace to a casting machine such as a die casting machine. It is about.

BACKGROUND ART As a conventional molten metal supply device, a molten metal pipe connectable to a casting machine is extended from a molten metal holding furnace, and an electromagnetic pump is interposed in the middle of the molten metal pipe. Is fed to a casting machine through a hot water supply pipe.

According to the electromagnetic pump-type supply device as described above, when the molten metal is a non-ferrous metal such as an aluminum alloy, if a magnetic metal component such as iron is mixed in the molten metal, the magnetic metal component is removed from the inside of the electromagnetic pump. The flow of the molten metal in the hot water supply pipe cannot be stopped immediately even if the pump is stopped, so there is a problem in quantitative performance. However, there was a problem that the cost was extremely high.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide an apparatus for quantitatively supplying molten metal that can be reliably supplied at a constant rate with little failure and that can be manufactured relatively inexpensively.

DISCLOSURE OF THE INVENTION The molten metal fixed-quantity supply device of the invention according to claim 1 has a closed-form pot 1 having a hot water supply port 2 and a discharge port 3 on the bottom side and arranged at a predetermined height position in a molten metal holding furnace 5. A tapping pipe 7 connected to the tapping port 3 and connectable to the casting machine M;
Opening and closing valves 8 and 38 for opening and closing the discharge port 3 respectively, level detecting means 10 for detecting an upper limit level L1 and a lower limit level L2 of the molten metal 6 in the pot 1, and a metal such as nitrogen gas or dry air in the pot 1. Gas that does not easily react to molten metal (hereinafter "inert gas")
And pressurizing the inside of the pot 1 to release the inert gas in the pot 1 to the atmosphere to reduce the pressure inside the pot 1.
The molten metal 6 that has flowed in
The molten metal 6 in the pot 1 is discharged from the outlet 3 through the tapping pipe 7 by pressurizing to L2.

According to the molten metal fixed-quantity supply device of the invention according to claim 1, a pot having a hot water supply port and a hot water discharge port 3 on the bottom side is disposed at a predetermined height position in a molten metal holding furnace, and flows into the pot from the hot water supply port. The molten metal in the pot is discharged from the outlet through a tapping pipe by pressurizing the molten metal with an inert gas from its upper limit level to its lower limit level. When the molten metal is a non-ferrous metal such as an aluminum alloy, the magnetic metal component is contained in the molten metal. Even if is mixed, the magnetic metal component does not adhere to the inside of the device and is not clogged, the number of failures is small, and the device can be manufactured relatively inexpensively and the cost can be reduced.

According to the first aspect of the present invention, an on-off valve for opening and closing a hot water supply port and an on-off valve for opening and closing a hot water outlet are provided in parallel, and the inert gas pressurized and supplied into the pot is released to the atmospheric pressure to discharge the inside of the pot. When the molten metal in the molten metal holding furnace flows into the pot by switching from the pressure side to the pressure reduction side, the opening / closing valve on the discharge port side is provided with a pressure reducing means configured to reduce the pressure. Since the molten metal flows into the pot from the hot water supply port with the outlet closed when activated, the amount of molten metal flowing into the pot can be accurately regulated.
This makes it possible to repeatedly and accurately maintain the amount of hot water per unit from the pot.

The molten metal fixed-quantity supply device according to the second aspect of the present invention includes a closed pot 1 having a water supply port 2 and a discharge port 3 on the bottom side, and disposed at a predetermined height in a molten metal holding furnace 5; 3 and a tapping pipe 7 which can be connected to the casting machine M, and a hot water supply port 2 which is moved up and down in the pot 1 by opening and closing driving means.
Opening and closing valves 8 and 38 for opening and closing the hot water outlet 3, respectively, level detecting means 10 for detecting the upper limit level L1 and the lower limit level L2 of the molten metal 6 in the pot 1, and supplying an inert gas into the pot 1 1 means for pressurizing and decompressing the inside of the pot 1 by forcibly sucking the inert gas in the pot 1
40, the molten metal 6 flowing into the pot 1 from the hot water supply port 2 is pressurized from its upper limit level L1 to its lower limit level L2 so that the molten metal 6 in the pot 1 is discharged from the drain port 3 through a tapping pipe. It is.

According to the second aspect, the on-off valve for opening and closing the hot water supply port and the on-off valve for opening and closing the hot water discharge port are provided in parallel, and the inside of the pot is depressurized by forcibly sucking the inert gas pressurized and supplied into the pot. Since the pressurizing and depressurizing means is provided as described above, in addition to the effect according to claim 1, even when the molten metal is discharged by pressurizing the inside of the pot, the level of the molten metal stored in the molten metal holding furnace decreases. , The upper limit level in the pot can always be kept at a fixed position, which eliminates the need to frequently replenish the molten metal in the molten metal holding furnace. It can be performed.

According to a third aspect of the present invention, in the molten metal fixed-amount supply apparatus according to the first or second aspect, the opening / closing drive means comprises hydraulic cylinders 9, 39 erected at the upper end of the pot 1,
Rod-shaped on-off valves 8, 38 are connected to 9,39 piston rods 9a, 39a.

According to the third aspect, as the drive means of the on-off valve, a fluid pressure cylinder erected at the upper end of the pot is used, and the rod-shaped on-off valve is connected to this cylinder. Compactness can be achieved.

According to a fourth aspect of the present invention, in the molten metal fixed supply apparatus according to the first or second aspect, the pot 1, the on-off valves 8, 38, and the tapping pipe 7 are each formed of ceramic.

According to the fourth aspect, since the pot, the on-off valve and the tapping pipe are each made of ceramic, the pot, the on-off valve and the tapping pipe having excellent heat resistance can be obtained at low cost.

According to a fifth aspect of the present invention, the hot water supply port 2 of the pot 1 is provided with a ceramic filter 26 at the inlet side in the molten metal constant supply apparatus according to the first or second aspect.

According to the fifth aspect, by mounting a ceramic filter on the inlet side of the hot water supply port of the pot, oxides, dusts, and other impurities mixed in the molten metal in the molten metal holding furnace can be removed, and casting can be performed. High quality molten metal can be supplied to the machine.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional side view showing a molten metal fixed-quantity supply device according to a first embodiment of the present invention.

FIG. 2 is a partially enlarged sectional view of the molten metal fixed-rate supply device shown in FIG.

FIG. 3 is a vertical sectional side view showing a molten metal supply device according to a second embodiment of the present invention.

FIG. 4 is an enlarged vertical sectional view showing one embodiment of the level detecting means.

BEST MODE FOR CARRYING OUT THE INVENTION FIG. 1 shows an apparatus for quantitatively supplying molten metal according to a first embodiment of the present invention, and FIG. 2 is a partially enlarged sectional view thereof. The first embodiment shows a specific example in a case where a molten metal mainly composed of an aluminum alloy is supplied to a casting machine. In these figures, reference numeral 1 denotes a bottomed cylindrical pot provided with a hot water supply port 2 and a hot water discharge port 3 on the bottom side, which is formed of ceramic, and whose upper end 1a is made of a required heat-resistant material. It is penetrated and supported by the body 4 in a sealed state, hangs downward from the lower surface of the support 4, and is inserted and arranged at a predetermined height position in the open / close hard-to-open molten metal holding furnace 5. In the molten metal holding furnace 5, a molten metal 6 of, for example, an aluminum alloy melted in a metal melting furnace is stored almost completely, so that the pot 1 is filled with the molten metal 6 as shown in FIG.
It will be immersed inside.

Reference numeral 7 denotes a pouring port (not shown) of a casting machine (for example, a die casting machine) M which is connected to the pouring port 3 of the pot 1.
A vertical pipe portion 7a formed of ceramic like the pot 1 and extending upward from the outer end of the hot water outlet 3 along the outer surface of the pot 1; A bend portion 7b connected to the upper end and supported by the support 4; and a horizontal tube portion 7c connected to the bend portion 7b and extending horizontally toward the casting machine M. The tip portion of the horizontal tube portion 7c
7d is pressed against the pouring port of the casting machine M.
Although not shown, a heater is attached to the tapping pipe 7 so that the molten metal 6 from the pot 1 can be supplied at an appropriate temperature.

Numeral 8 denotes an opening / closing valve for opening and closing the hot water supply port 2 of the pot 1 by vertically moving the inside of the pot 1 by a predetermined stroke by a fluid pressure cylinder 9 as opening / closing drive means, and as shown in FIG. Ceramic hollow valve stem with body 8a
8b. The fluid pressure cylinder 9 is erected on the support 4, and its piston rod 9 a penetrates the support 4 slidably in a sealed state and is connected to the valve rod 8 b in the support 4. Thus, the valve stem due to the extension operation of the cylinder 9
By the downward movement of the valve 8b, the valve body 8a is closely engaged with the hot water supply port 2 and the hot water supply port 2 is closed, and the valve body 8a is detached from the hot water supply port 2 by the upward movement of the valve rod 8b due to the contraction operation of the cylinder 9. Then, the hot water supply port 2 is opened.

Reference numeral 10 denotes a level detecting means for detecting the upper limit level L1 and the lower limit level L2 of the molten metal 6 in the pot 1. In addition, pot 1
The upper limit level L1 of the molten metal 6 in the inside is the level of the molten metal surface when the molten metal starts to flow to the casting machine, and is the same as the molten metal surface level Lo of the molten metal 6 (the molten metal 6 outside the pot 1) stored in the molten metal holding furnace 5. Often becomes. The lower limit level L2 is the level of the surface of the molten metal in the pot 1 at the time when the tapping into the casting machine is completed.
An embodiment of the level detecting means 10 will be described with reference to FIG. 4. A flange 12 is attached to the center of the upper surface of the support 4 located directly above the pot 1 via a base plate 11, and this flange 12 The float shaft 14 is slidably inserted into a guide sleeve 13 which is fixed by vertically penetrating the base plate 11 and the support 4, and a float 15 is attached to the lower end of the float shaft 14 located in the pot 1. The detection target 16 is attached to each upper end. A transparent cylindrical cover 17 having an upper end closed is disposed on the flange 12 so as to cover the float shaft 14 and the detection object 16. Upper and lower 2 consisting of 18a, 19a and photo detectors 18b, 19b
The two photoelectric switches 18 and 19 are installed so as to be adjustable in height as detection means for the object 16 to be detected, so that the upper photoelectric switch 18 detects the upper limit level L1 via the object 16 and the lower photoelectric switch. The switch 19 detects the lower limit level L2 via the detection target 16.

The base plate 11, flange body 12, guide sleeve 13, float shaft 14, float 15, object 16 to be detected, and cylindrical cover 17
Are each formed of ceramic. Detected object
The 16 detecting means is not limited to the photoelectric switches 18 and 19, but may be a proximity switch or the like. In addition, although the above-described level detecting means 10 employs a float type detecting means,
In addition to the above, a type in which the level of the molten metal 6 in the pot 1 is directly measured by a laser, or a type in which the electrostatic dose is variable may be employed.

In FIG. 1, reference numeral 20 denotes an inert gas (a gas which is difficult to react with a molten metal such as nitrogen gas or dry air) supplied to the pot 1 to pressurize the inside of the pot 1 and to supply the supplied inert gas to the atmosphere. And a pressure reducing means for reducing the pressure inside the pot 1 by discharging to the inside. This pressurizing and depressurizing means 20
A pressurizing source comprising, for example, a tank containing an inert gas and a pump for pumping the gas into a gas supply / discharge hole 21 (see FIG. 1) provided to penetrate through the support 4 and communicate with the inside of the pot 1 22 is connected by a gas line 23, and a pressure regulating valve 24 and an electromagnetic switching valve 25 are provided on the line 23. The electromagnetic switching valve 25 is not shown, but controls the fluid pressure cylinders 9, 39. Photoelectric switch of the unit and level detecting means
18 and 19 are electrically connected respectively. The pressure in the pot 1 may be arbitrarily changed by using an electrically controllable pressure control valve as the pressure adjusting valve 24.

When the inert gas is supplied into the pot 1 and pressurized, the switching valve 25 may be operated so as to open the flow path from the pressurizing source 22 to the gas supply / discharge hole 21. When depressurizing the inside of 1, the switching valve may be operated so that the flow path from the pressurizing source 22 is shut off and the gas supply / discharge hole 21 communicates with the air release flow path. The adjustment of the pressing force in the pot 1 can be performed by the pressure adjusting valve 24. The pressure source 22 may be a high-pressure cylinder filled with an inert gas under pressure.

A ceramic filter 26 for removing oxides, dust and other impurities mixed in the molten metal 6 in the molten metal holding furnace 5 is attached to the inlet side of the hot water supply port 2 of the pot 1. . As shown in FIG. 2, the filter 26 is formed in a box shape, a hemispherical shape, or any other desired shape in which each wall portion has a porous shape by ceramic.
The porous state is about 10-60 mesh. In mounting the filter 26, a locking portion 27 is provided on the lower surface of the pot 1, and a flange 26a at the upper end of the filter 26 may be locked to the locking portion 27. The filter 26 may be attached as needed.

The tapping pipe 7 is provided with a hydraulic cylinder type horizontal moving means 28.
Thereby, it can be horizontally moved integrally with the pot 1. That is, as shown in FIGS. 1 and 2, the horizontal moving means 28 moves the support frame 30 from the upper end of the base frame 29 provided adjacent to the molten metal holding furnace 5 over the molten metal holding furnace 5. Plackets 31 are formed on guide rails 30a, 30a formed on both sides in the longitudinal direction of the support frame 30, respectively.
A plurality of wheels 32 attached via a roller are rotatably engaged, and the support 4 is interlocked to a piston rod 33a of a fluid pressure cylinder 33 installed on a base frame 29 via a connecting rod 33b. The support body 4 and the pot 1 and the tapping pipe 7 integrally provided with the support body 4 by the expansion and contraction operation of the cylinder 33.
Can be moved horizontally in the longitudinal direction of the support frame 30.
Therefore, by appropriately expanding and contracting the fluid pressure cylinder 33, the tip 7d of the tapping pipe 7 can be pressed against the molten metal port (not shown) of the casting machine M and reliably brought into contact.

Reference numeral 38 denotes an opening / closing valve for opening and closing the hot water outlet 3 of the pot 1 by vertically moving the inside of the pot 1 by a predetermined stroke by a fluid pressure cylinder 39 as opening / closing drive means. As shown in FIG. 2, a valve rod 38b having a valve body 38a having an arcuate cross section at the lower end has a valve rod 38b.
A piston rod 39a is erected on the support 4 in parallel with the fluid pressure cylinder 9 of the hot water supply opening / closing valve 8, and its piston rod 39a penetrates the support 4 in a sealed state so as to be slidable.
Connected to 38b. Thus, the valve body 38a is closely engaged with the drain port 3 to close the drain port 3 by the downward movement of the valve rod 38b due to the extension operation of the cylinder 39, and the valve rod 38b is closed by the contraction operation of the cylinder 39. The valve body 38a is detached from the hot water outlet 3 by the upward movement, and the hot water outlet 3 is opened. The on-off valve 38 is also formed of ceramic.

In the use of the molten metal constant-quantity supply device configured as described above, as shown in FIGS. 1 and 2, the hot water supply opening / closing valve 8 moves upward, the hot water supply opening 2 is opened, and the hot water supply opening / closing valve 38 is closed. By moving the pressure reducing side of the pressurizing and depressurizing means 20 to release the inside of the pot 1 to the atmospheric pressure from the state where the molten metal outlet 3 is closed by lowering, the molten metal 6 in the molten metal holding furnace 5 is The molten metal 6 flows into the pot 1 and the upper limit level L1 in the pot 1
When it rises, the level detection means 10 detects this.
That is, when the float 15 rises with the rise of the molten metal 6 and the object 16 moves up to the position corresponding to the upper limit level L1 via the float shaft 14, the object 16 is moved to the photoelectric switch 18
Is detected.

In response to this detection signal, the fluid pressure cylinder 9 extends to move the open / close valve 8 downward and close the hot water supply port 2, and simultaneously, the fluid pressure cylinder 39 contracts to move the open / close valve 38 upward and the hot water outlet 3
At the same time, the operation of the pressurizing and depressurizing means 20 is switched to the pressurizing side, so that the inert gas is supplied from the gas supply / discharge hole 21 to the upper part in the pot 1. As a result, the molten metal 6 in the pot 1 is pressurized and discharged from the molten metal outlet 3 to the tapping pipe 7. When the level of the molten metal 6 in the pot 1 falls to a predetermined lower limit level L2, The photoelectric switch 19 detects the object 16 that has been lowered to the corresponding position. In response to this detection signal, the hydraulic cylinder 9 contracts to move the on-off valve 8 upward to open the hot water supply port 2 and at the same time the hydraulic cylinder 39
Is extended, the opening / closing valve 38 is moved downward to close the hot water outlet 3, and at the same time, the pressure reducing side of the pressure reducing means 20 is operated, so that the inert gas supplied into the pot 1 is discharged into the gas supply / discharge hole 21. Is released to the atmosphere through the switching valve 25, and thereby the molten metal holding furnace 5
The molten metal 6 flows into the pot 1. Thereafter, the above operation is repeated.

According to the above-described molten metal quantitative supply device, the molten metal 6 is pressurized and lowered from the upper limit level L1 to the lower limit level L2 by the inert gas supplied into the pot 1, whereby the pot 1
In the molten metal 6 inside, a fixed amount corresponding to the product of the interval length between the two levels L1 and L2 and the cross-sectional area inside the pot 1 is discharged from the tapping pipe 7, so that the above series of operations is repeated a plurality of times. By repeating, the amount of the molten metal 6 corresponding to the plural times can be supplied quantitatively. The level of the molten metal 6 is determined by the upper and lower photoelectric switches 18 and 19 of the level detector 10 (detector).
Can be freely changed by changing the position in the vertical direction. In this case, the upper and lower photoelectric switches 18,1
Any of the nine positions may be changed.

In this apparatus, when the molten metal in the pot 1 is discharged to the lower limit level L2, the switching valve 25 of the pressurizing and depressurizing means 20 is switched by a detection signal to operate on the depressurizing side and the molten metal 6 in the molten metal holding furnace 5 When water flows into the pot 1, the open / close valve 38 on the side of the hot water outlet 3 is operated to close the hot water outlet 3 and the hot water supply port 2 is closed.
To allow the molten metal 6 to flow into the pot 1 from
The amount of the molten metal 6 flowing into the pot 1 can be accurately regulated, and, for example, a part of the molten metal 6 flowing into the pot 1 is not discharged from the molten metal outlet 3 to the outside.

FIG. 3 shows a molten metal fixed-amount supply device according to a second embodiment of the present invention. This device is different from the first embodiment in that the inert gas supplied into the pot 1 is forced to the outside. The point is that a pressurizing and depressurizing means 40 for sucking and depressurizing the inside of the pot 1 is provided. The other configuration is the same as that of the second embodiment, and the same components are denoted by the same reference numerals and description thereof will be omitted.

That is, as illustrated in FIG. 3, the pressurizing and depressurizing means 40 includes an inert gas tank 34 storing an inert gas in a gas supply / discharge hole 21 communicating with the inside of the pot 1, and an inert gas tank in the tank 34. And an inert gas pressure pump 35 for pumping the gas through a gas line 36, and a pressure regulating valve 37 and an electromagnetic switching valve 41 are provided in this line 36, and the electromagnetic switching valve 41 and the inert gas tank 34 are bypassed. The bypass line 42 is connected with a suction pump 43 and a pressure regulating valve 44. Although not shown, the electromagnetic switching valve 41 is electrically connected to the control units of the fluid pressure cylinders 9 and 39 and the photoelectric switches 18 and 19 of the level detecting means 10, respectively.

Thus, when the inert gas is supplied into the pot 1 and pressurized, the switching line 41 is closed so that the bypass line 42 is cut off and the flow path from the inert gas pressure pump 35 toward the gas supply / discharge hole 21 is opened. When the pressure inside the pot 1 is reduced, the gas supply / discharge holes 21
The switching valve 41 may be operated so as to shut off the flow path toward and to open the bypass line. The pressure adjustment and the pressure reduction in the pot 1 can be performed by the pressure adjusting valves 37 and 44.

In the use of the molten metal constant-quantity supply device configured as described above, the hot-water opening / closing valve 8 moves upward, the hot-water opening 2 opens, and the hot-water opening / closing valve 38 moves downward, and the hot-water outlet 3 closes. In this state, the depressurizing side of the pressurizing and depressurizing means 40 is operated to suck the inside of the pot 1 toward the outside, so that the molten metal 6 in the molten metal holding furnace 5 flows into the pot 1 from the hot water supply port 2, When the molten metal 6 rises to the upper limit level L1 in the pot 1, the level detecting means 10 detects this. That is, when the float 15 rises with the rise of the molten metal 6 and the object 16 moves up to the position corresponding to the upper limit level L1 via the float shaft 14, the object 16 is detected by the photoelectric switch 18. .

In response to this detection signal, the fluid pressure cylinder 9 extends to move the open / close valve 8 downward, closing the hot water supply port 2 and at the same time, the fluid pressure cylinder 39 contracts to move the open / close valve 38 upward, thereby opening the drain port 3. At the same time, the operation of the pressurizing and depressurizing means 40 is switched to the pressurizing side, and the inert gas is supplied from the gas supply / discharge hole 21 to the upper portion of the inside of the pot 1. As a result, the molten metal 6 in the pot 1 is pressurized and discharged from the molten metal outlet 3 to the tapping pipe 7. When the level of the molten metal 6 in the pot 1 falls to a predetermined lower limit level L2, The photoelectric switch 19 detects the object 16 that has been lowered to the corresponding position. In response to this detection signal, the hydraulic cylinder 9 contracts to move the on-off valve 8 upward to open the hot water supply port 2, and at the same time, the hydraulic cylinder 9
When the pot 39 is extended, the opening / closing valve 38 is moved downward to close the hot water outlet 3, and at the same time, the pressure reducing side of the pressure reducing means 40 is operated, and the pot 1
The inert gas supplied into the furnace is returned from the gas supply / discharge hole 21 to the inert gas tank 34 through the bypass line 42 via the switching valve 41, whereby the molten metal holding furnace 5
The molten metal 6 flows into the pot 1. Thereafter, the above operation is repeated.

According to the above-described molten metal quantitative supply device, the molten metal 6 is pressurized and lowered from the upper limit level L1 to the lower limit level L2 by the inert gas supplied into the pot 1, whereby the pot 1
In the molten metal 6 inside, a fixed amount corresponding to the product of the interval length between the two levels L1 and L2 and the cross-sectional area inside the pot 1 is discharged from the tapping pipe 7, so that the above series of operations is repeated a plurality of times. By repeating, the amount of the molten metal 6 corresponding to the plural times can be supplied quantitatively. The level of the molten metal 6 is determined by the upper and lower photoelectric switches 18 and 19 of the level detector 10 (detector).
Is the same as the first embodiment in that the position can be changed freely by changing the position in the vertical direction. In this case, any of the positions of the upper and lower photoelectric switches 18 and 19 may be changed as in the above embodiment.

In particular, in this apparatus, an on-off valve 8 for opening and closing the hot water supply port 2 and an on-off valve 38 for opening and closing the hot water discharge port 3 are provided side by side, and the inert gas pressurized and supplied into the pot 1 is forcibly sucked to the outside. Since the pressurizing and depressurizing means 40 for depressurizing the inside of the pot 1 is provided, when the molten metal 6 is discharged by pressurizing the inside of the pot 1, the surface level Lo of the molten metal 6 stored in the molten metal holding furnace 5 is lowered. Even if it descends, the upper limit level L1 in the pot 1 can always be maintained at a fixed position, so that it is not necessary to frequently supply the molten metal 6 into the molten metal holding furnace 5, and the supply operation of the molten metal 6 is facilitated. In addition, more accurate quantitative supply can be performed.

Although the above embodiment mainly describes a specific example in which a molten metal of an aluminum alloy is supplied, the present invention is not limited to this embodiment, and may be used as a molten metal supply device of various metals such as a molten magnesium. Needless to say. In the case of molten magnesium, the pot, the on-off valve or the tapping pipe can be made of iron.

INDUSTRIAL APPLICABILITY As is clear from the above description, according to the present invention, the molten metal in the molten metal holding furnace can be automatically and reliably supplied to the casting machine in a constant amount, and the use of an inert gas Since the molten metal is supplied and discharged by the pressurizing and depressurizing means, even if the molten metal is a non-ferrous metal such as an aluminum alloy, even if a magnetic metal component is mixed in the molten metal, as in the case of using a magnetic pump, The components are not adsorbed and clogged in the device, and there are few failures, and the device can be manufactured relatively inexpensively and the cost can be reduced. Also, no oxide is generated on the metal surface by using an inert gas. Further, since the molten metal can be discharged without lowering the temperature of the molten metal, the temperature of the melting furnace and the holding furnace can be lowered, which contributes to energy saving and enables high quality casting.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B22D 39/06 B22D 35/00 B22D 17/02 F04F 1/06

Claims (5)

(57) [Claims] 1. A closed pot having a hot water supply port and a hot water discharge port on a bottom side and disposed at a predetermined height in a molten metal holding furnace.
A tapping pipe connected to the drainage port and connectable to the casting machine,
Opening / closing valves for opening and closing the hot water supply port and the hot water outlet by moving the inside of the pot up and down by opening and closing driving means, level detecting means for detecting the upper and lower levels of the molten metal in the pot, and nitrogen gas or drying in the pot. A pressure that depressurizes the interior of the pot by supplying a gas (hereinafter referred to as "inert gas") that is difficult to react with the molten metal such as air and releasing the inert gas in the pot to the atmosphere Means for pressurizing the molten metal flowing into the pot from the hot water supply port from the upper limit level to the lower limit level so that the molten metal in the pot is discharged from the drain port through a tapping pipe. 2. A closed pot having a hot water supply port and a hot water discharge port on a bottom side and disposed at a predetermined height position in a molten metal holding furnace.
A tapping pipe connected to the drainage port and connectable to the casting machine,
Opening / closing valves that move up and down in the pot by opening / closing drive means to open and close a hot water supply port and a hot water discharge port respectively, level detection means for detecting an upper limit level and a lower limit level of molten metal in the pot, and an inert gas in the pot. Pressurizing and depressurizing means for supplying and pressurizing the inside of the pot, and forcibly sucking the inert gas in the pot to depressurize the inside of the pot. A molten metal metering / supplying device that pressurizes a molten metal in a pot from a drain port through a tapping pipe by pressurizing to a level. 3. The fixed amount of molten metal according to claim 1, wherein the opening / closing drive means comprises a hydraulic cylinder erected on the upper end of the pot, and a rod-shaped opening / closing valve is connected to a piston rod of the hydraulic cylinder. Feeding device. 4. The apparatus according to claim 1, wherein the pot, the on-off valve and the tapping pipe are each made of ceramic. 5. The molten metal metering and feeding apparatus according to claim 1, wherein a ceramic filter is attached to a hot water supply port of the pot on an inlet side thereof.