JPH09216042A - Hot water supply method of closed hot water supply device - Google Patents

Abstract

(57) [Abstract] (Correction) [Problem] To provide a hot water supply method for a sealed hot water supply device in which molten metal is not dripped during ladle transfer, the amount of hot water supplied is constant, the accuracy of hot water supply is high, and no oxide is mixed. To do. SOLUTION: The ladle suspension supporting elevating means 60 is operated to make the ladle stationary so that the molten metal surface in the ladle 20 immersed in the melting and holding furnace is in contact with the lower surface of the sealing lid 20b, and the ladle suction port 20c is opened. After the molten metal is filled with the molten metal, the suction port is closed to transfer the ladle, the molten metal discharge side of the conduit 2B is inserted into the injection sleeve, and then pressurized gas is injected into the ladle to obtain the required amount of molten metal in the ladle. A hot water supply method for supplying hot water into the injection sleeve, the pressure sensor 32 being installed in the pressurized gas supply line 30 after injecting gas during hot water supply.
The amount of molten metal supplied to the injection sleeve is controlled by injecting gas into the ladle for the time set by the timer after detecting the gas pressure in the ladle and reaching the set pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed hot water supply device for supplying a molten metal such as an aluminum alloy or a magnesium alloy to an injection sleeve of a molding device such as a die casting machine, and a hot water supply method for the sealed hot water supply device, and more particularly, accuracy of hot water supply. The present invention relates to a hot water supply method of a sealed hot water supply device in consideration of improvement of the water temperature.

[0002]

2. Description of the Related Art Conventionally, in order to supply a molten metal such as an aluminum alloy or a magnesium alloy to an injection sleeve of a die casting machine, conventionally, as shown in FIG.
Using a mechanical mechanism, the ladle 20 that has taken out the molten metal inside rises or moves laterally while drawing an arcuate locus to move to the position of the inclined injection sleeve 200, and then,
The ladle inversion method of pouring the molten metal in the ladle 20 into the injection sleeve has been adopted. Further, as shown in FIG. 9, a lid 20a is provided on the top and an opening (suction port 20c) is provided on the bottom, and an unsealed ladle 20 having an air vent 20d on the lid 20a is dipped into the melting and holding furnace 10 to form a bottom portion. Opening 2
After the molten metal has penetrated into the ladle 20 from 0c, the opening 2
After closing 0c, the ladle 20 is moved to the position of the inclined injection sleeve 200, and while the ladle 20 is inclined along the axis of the injection sleeve 200 while the bottom of the ladle is inserted into the injection sleeve 200, A method has also been employed in which the opening 20c is changed from the closed state to the open state, and the molten metal inside the ladle is naturally dropped and supplied (supplied with hot water) into the injection sleeve 200. This method is called the bottomed ladle method.

[0003]

However, in any of the above-mentioned ladle inversion method and bottomed-out ladle method, the pouring port (ladle discharge port) to the injection sleeve is the ladle body when pouring the molten metal into the ladle. Since the molten metal is immersed in the melting and holding furnace, the molten metal not only enters the inside of the ladle but also adheres to the outer periphery of the ladle, moves the ladle to the position of the injection sleeve, and adheres to the outer periphery of the ladle during the subsequent pouring operation. The molten metal reacts with oxygen in the air to produce oxides,
In addition, this drops during pouring and drops into the injection sleeve together with the molten metal inside the ladle. There is a problem in that the molten metal falling product forms an oxide upon contact with air, so that the oxide is mixed into a cast product after die casting, which causes deterioration in quality. In addition, in both the ladle inversion method and the bottomed ladle method described above, the accuracy of the amount of hot water taken into the ladle is rough and the quality of the molded product is not constant because the amount of hot water supplied to the injection sleeve varies each time. There was a drawback in that the quality could not be kept uniform, and there was the background that improvement in hot water supply precision is essential for improving the quality of molded products. Further, in the bottom removal method, the opening (suction port 20c) is opened downward in the center of the bottom, and when the seal of the opening / closing device after the molten metal is taken into the ladle is incomplete, the injection sleeve There was a problem that the molten metal was dripped at the time of transfer of the ladle up to, and it was not only dangerous but also contaminated the working environment significantly. further,
The above-mentioned ladle (the ladle 20 in FIG. 6 and the ladle 20 in FIG. 7)
However, the height of the molten metal that falls into the injection sleeve at the beginning of hot water supply is large, and at the time of a large drop height, the surrounding air may be trapped and casting defects such as blowholes may occur in the cast product. there were. Further, these methods have a drawback in that the amount of hot water supplied each time the powder is supplied to the injection sleeve is slightly different, so that the molding conditions slightly change from shot to shot and the quality of the molded product is not uniform.

[0004]

In order to solve the above problems, in the present invention (first invention), a closed type hot water supply for supplying molten metal of aluminum alloy or magnesium alloy into an injection sleeve of a die casting machine or the like. An apparatus, which is provided with a suction port for molten metal which is immersed and suspended in a melting and holding furnace for molten metal and which is provided so as to project to the side of the bottom and which is opened upward and which is capable of interrupting communication A ladle provided with an opening / closing device composed of a valve rod cylinder for raising and lowering a valve rod on the outside of the ladle body, the ladle suspension supporting elevating means, one end housed in the ladle and the other end projecting from the ladle and the injection. A conduit inserted into the sleeve for pouring the molten metal in the ladle to the injection sleeve, and a means for injecting pressurized gas for pressurizing the molten metal surface in the ladle to discharge the molten metal in the ladle. And a pressurized gas supply line having a pressure sensor and a flow rate adjusting valve, and the molten metal discharge side of the conduit is inclined downward, and the ladle suspension support elevating means is inclined in the elevating direction. In a hot water supply method using a closed type hot water supply device inclined in parallel with a sleeve, a ladle suspension support elevating means is provided so that a molten metal surface in a ladle immersed in a melting and holding furnace contacts a lower surface of a sealing lid of the ladle. Operate to make the ladle stand still, open the suction port to fill the inside of the ladle, then close the suction port to transfer the ladle, and insert the melt discharge side of the conduit into the injection sleeve. After that, a pressurized hot gas is injected into the ladle to supply a required amount of molten metal in the ladle into the injection sleeve. At the time of hot water supply after inserting into the injection sleeve, after the pressurized gas is injected into the ladle, the gas pressure in the ladle is detected by the pressure sensor installed in the pressurized gas supply line, The amount of molten metal supplied to the injection sleeve is controlled by injecting pressurized gas into the ladle for a predetermined time set by a timer after the set pressure is reached. Further, in the hot water supply method for the hermetically sealed hot water supply apparatus according to the second invention, in the method according to the first invention, the pressurized gas detection pressure when the molten metal first passes through the uppermost point of the conduit in the hot water supply for several shots is previously measured. Then, the average pressure is calculated, and during the injection of the pressurized gas of the shot, the detection pressure in the ladle that rises after the injection is started is 70 times the average pressure.
When the set pressure in the range of 100% to 100% is reached, the timer is activated, the injection of the pressurized gas is continued until the timeout of the predetermined time set in the timer, and the injection of the pressurized gas is stopped after the timeout. Thus, the amount of molten metal supplied to the injection sleeve is controlled.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION According to the hermetically sealed hot water supply apparatus of the present invention, in the hot water supply method using the hermetically sealed hot water supply apparatus, the molten metal liquid level in the ladle immersed in the melting and holding furnace is the lower surface of the hermetically sealed lid The ladle suspension supporting elevating means so as to be in contact with the ladle to make the ladle stationary, open the suction port to fill the inside of the ladle with molten metal, and then close the suction port to transfer the ladle, After inserting the molten metal discharge side into the injection sleeve, by injecting a pressurized gas into the ladle, a hot water supply method of a sealed hot water supply device for supplying a required amount of molten metal in the ladle into the injection sleeve, During hot water supply after inserting the molten metal discharge side of the conduit into the injection sleeve,
After injecting the pressurized gas into the ladle, the gas pressure in the ladle is detected by the pressure sensor installed in the pressurized gas supply line, and the timer is set after the detected pressure reaches the preset set pressure. The amount of molten metal supplied to the injection sleeve is controlled by injecting pressurized gas into the ladle for a predetermined time.

Therefore, the ladle is immersed in the melting and holding furnace containing the molten metal, and the molten metal intake port of the upper opening projecting to the side of the bottom of the ladle is opened to suck the molten metal into the ladle and the molten metal is almost filled. After taking in, the suction port is closed by an opening / closing device consisting of a valve rod and a valve rod cylinder for vertically raising and lowering the lateral side of the ladle body without passing through the ladle body. After the molten metal has been taken into the ladle, operate the ladle suspending / supporting elevating means to transfer the ladle and insert the tip of the conduit discharge side connected to the ladle up to near the top of the plunger tip on the bottom of the injection sleeve, and insert the inert gas. A pressurized gas such as is blown into the ladle, and the molten metal in the ladle is supplied to the injection sleeve through the conduit by this pressing force.

At this time, it is necessary to accurately discharge the amount of hot water required for one shot from the molten metal filled in the ladle and supply it to the injection sleeve (this is called hot water supply). Then, the pressurized gas pressurized to a predetermined pressure slightly higher than the atmospheric pressure is injected into the ladle, and the molten metal discharge amount in the ladle, that is, the amount of hot water supplied once is controlled by detecting the pressurized gas in the ladle. When the pressure reached a preset value, the molten metal in the ladle started to flow into the injection sleeve beyond the uppermost portion of the conduit, and the flowing time was regulated to control the molten metal supply amount. Therefore, the amount of hot water supplied is high, the amount of hot water supplied to the injection sleeve is made uniform every time, and the quality of the cast product is kept good. In addition, when the molten metal taken into the ladle is filled in the ladle, the pressurized gas injected into the ladle to pressurize the molten metal surface in the ladle is in a state where the molten metal is filled in the ladle. Since there is no extra space and therefore no extra gas, there is no change in pressure, and the pressurized gas held at a predetermined pressure set in advance presses the molten metal surface while discharging it, and the injection sleeve As a result, the hot water supply conditions are stabilized.

Further, in the second invention, the pressurized gas detection pressure when the molten metal first passes through the uppermost point of the conduit during hot water supply in several shots is measured in advance to calculate the average pressure, and the shot pressure is calculated. During the pressurized gas injection, the detection pressure in the ladle that rises after the injection is started is 7 times the average pressure.
When the set pressure in the range of 0% to 100% is reached, the timer is activated, the injection of pressurized gas is continued until the timeout of a predetermined time set in the timer, and the injection of pressurized gas is stopped after the timeout. Since the amount of molten metal supplied to the injection sleeve is controlled by adjusting the pressure of the pressurized gas when injecting pressurized gas into the ladle after the completion of filling the molten metal to supply the molten metal in the ladle to the injection sleeve. In order to prevent a decrease in hot water supply accuracy, the hot water supply amount changes by a minute amount even when the pressurized gas is injected for a fixed set pressure or for a fixed injection time. It was decided to set the actual start time of the molten metal flow into the sleeve by referring to the more accurate average value of the pressure fluctuations of the past several times. Therefore, in the closed-type hot water supply device of the present invention, compared with the prior art, the hot water supply work is simplified and the hot water supply conditions for each time are made uniform, the hot water supply accuracy is high, and the molten metal dripping during ladle transfer is small, and Since the mixture of molten oxide is small, the quality of the cast product can be maintained good and the quality can be made uniform.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 6 are all related to an embodiment of the present invention, FIG. 1 is an overall configuration diagram of a hermetically sealed water heater, FIG. FIG. 4 is a front view of the non-working oxide removing device showing an AA view of FIG. 2, and FIG. 5 is B of FIG. -Enlarged vertical cross-sectional view of the main part of the closed-type hot water supply device showing the position state of the oxide removing device during the work seen from B, FIG. 6 is a pressure waveform diagram showing changes in the pressure inside the ladle during the hot water supply test, and FIG. It is a pressure waveform diagram which shows the change of the pressure in a ladle at the time of operation.

As shown in FIG. 1, a hermetically sealed hot water supply apparatus 1 used in the present invention is a ladle suspension supporting lifting cylinder 60 in which an upright cylindrical ladle 20 is inclined and fixed to a building (or structure) 50. It is connected to the tip of a piston rod 60a of the above and is suspended, and is held so that most of it is immersed in the melting and holding furnace 10. The upper end of the ladle 20 is a canopy 20a and a sealing lid 20b. An opening (suction port 20c) that is joined and sealed via the above and is provided so as to project to the side of the bottom and is opened upward for the molten metal M in the melting and holding furnace 10 to be sucked into the ladle 20.
And a valve rod cylinder for connecting and disconnecting the inlet 20c and the melting and holding furnace 10, and a valve rod cylinder that is a means for raising and lowering the valve rod 22 fixedly mounted on the support 24a attached to the canopy 20a. An opening / closing device 40 composed of 24 is provided.

On the other hand, the canopy 20a and the sealing lid 20b have one end penetrating downward into the ladle 20 and the other end curved so that the injection sleeve 200 of the die casting machine has an inclined axis X.
A conduit 28 that is inclined and descends along −X is attached, and an inert gas supplied from an inert gas supply device 70 such as N ₂ gas, Ar gas, or CO ₂ gas is injected into the ladle 20. An active gas pipe 30 is provided.
The inert gas pipe 30 is a pressurized gas supply line equipped with a pressure sensor and a flow rate adjusting valve. The ladle support 26 attached to the upper part of the sealing lid 20a is, as described above, the piston rod 60 of the ladle suspension support lifting cylinder 60.
Laddle suspension support lifting cylinder 60 connected to the tip of a
The operation allows the ladle 20 and the conduit 28 to move up and down along the integrally inclined axis X-X.

As the pressurizing gas, in addition to the inert gas, waste gas in the factory, combustion gas or normal air can be used, but in order to prevent the oxidation of the molten metal, the gas containing no oxygen is used. Active gas (N ₂ gas, Ar gas, CO ₂ gas, etc.) is desirable. The inert gas pipe 30 is configured so as to pass through the temperature adjusting device 90 and be heated to a desired temperature after exiting the inert gas supply device 70. The supply time can be controlled arbitrarily. Further, the three hydraulic cylinders, which are the ladle suspension support lifting cylinder 60, the valve rod cylinder 24, and the cleaning tool lifting cylinder 11 of the oxide removing apparatus 100 described later.
The hydraulic pipes of 0 are independently connected to a hydraulic unit (not shown), and the hydraulic unit is connected to a programmable controller (not shown) to receive an operation command from the programmable controller and operate.

Also, as shown in FIGS.
An oxide removing device 100 for removing and cleaning the molten metal and the molten oxide adhering to the outer periphery of the discharge portion tip 28a is disposed on the conduit discharge side of the support 26. As shown in FIGS. 4 to 5, the oxide removing apparatus 100 includes a cleaning tool opening / closing cylinder 120 and a cleaning tool opening / closing cylinder 120 that includes a pair of left and right cleaning tools 122 that grip the outer periphery of the conduit 28 and slide in the conduit axial direction. The cleaning tool lifting cylinder 110 is configured to move the cylinder 120 up and down in the axial direction of the conduit, and the cleaning tool opening and closing cylinder 120 is retracted upward as shown in FIG. 2 while the molten metal is being supplied. As shown in FIG.
The cleaning tool 122 is slid up and down on a to remove the molten metal and molten oxide adhering to the outer circumference of the conduit. The cleaning tool lifting cylinder 110 and the cleaning tool opening / closing cylinder 120 may be air cylinders instead of hydraulic cylinders.

Next, the hot water supply method according to the present invention by controlling the pressure of the pressurized gas will be described. First, when controlling the pressure of the pressurized gas, a hot water supply test is performed in advance to adjust the flow rate of the pressurized gas during hot water supply so that the pressure waveform best represents the flow of molten metal during hot water supply. . This will be specifically described with reference to FIG. 6. In each of the three pressure waveforms in FIG. 6, the horizontal axis represents the time axis and the vertical axis represents the ladle internal pressure, and from the start of injection of the pressurized gas to the injection sleeve 200. Shows the pressure change until the completion of hot water supply. A curve A in FIG. 6 shows a case where the opening of the flow rate adjusting valve 34 is increased to increase the flow rate of the pressurized gas, while a curve C is decreased to decrease the flow rate of the pressurized gas. Curve B shows the case where the flow rate is between the two curves A and C. As can be seen by comparing these three curves A, B, and C, in the curve C, the inflection point at which the first molten metal rises to the uppermost point of the conduit 28, reverses, and descends the conduit discharge side inclined pipe. Is unclear and inappropriate, and conversely curve A
Although the inflection point is clear, it can be seen that the supply rate of the pressurized gas is too high because the pressure (the pressure in the ladle) slightly decreases after the pressure waveform passes the inflection point. Therefore, it is understood that the case of the curve B in which the inflection point is clear and there is no pressure drop after the inflection point is the pressurized gas flow rate most suitable for supplying the molten metal. In this way, the opening degree of the flow rate adjusting valve 34 is selected so as to optimize the flow rate of the pressurized gas, and the hot water supply operation of the actual operation is performed.

In this way, the selected flow rate adjusting valve 3
At an opening of 4, normally, as shown in FIG. 7, a pressure waveform like a curve B is shown every time when hot water is supplied by injecting the pressurized gas into the ladle. However, some disturbance is added to the pressure waveform of the curve B. Are not the same each time, and may change slightly. Therefore, the pressure waveform of the curve B, which is a guideline for the operation, is not adopted as it is, and the pressure waveform of the past several times is taken into consideration when hot water is supplied to the shot, and the average pressure at the inflection points of the pressure waveform is calculated. As a guideline, a certain pressure set from the pressure in the range of 70% to 100% (average pressure of the inflection point itself) with respect to the average pressure of the inflection point is applied to It is determined that the molten metal is supplied to the injection sleeve 200 by controlling the timer from that time and stopping the supply of the pressurized gas after the timer has timed out for a certain period of time.

The operation of the hermetically sealed hot water supply apparatus 1 of the present invention having the above-described structure will be described. First, empty ladle 2
0 is put in the melting and holding furnace 10, and the ladle 20 is stopped by operating the ladle suspension support lifting cylinder 60 so that the lower surface of the closed lid 20b and the molten metal level in the melting and holding furnace match. Next, the melt surface level of the melting and holding furnace 10 is set to 2
The ladle 2 is held in a state as shown in FIG. 2 so that the molten metal fills the inside of the ladle in line with the lower surface of the sealing lid 20b of No. 0.
At 0, the valve rod cylinder 24 is operated to raise the valve rod 22 to open the suction port 20c to discharge the gas in the ladle 20 and allow the molten metal M of the melting and holding furnace 10 to be naturally sucked into the ladle 20. .

After the ladle 20 is completely filled with the molten metal, the suction port 20c is closed, and the ladle suspending / supporting lifting cylinder 60 is operated to move the tip of the discharge portion of the conduit 28 (the tip on the discharge side of the conduit) 28a. The tip of the discharge portion 28a of the conduit 28 is adjusted so as to come close to the upper surface of the plunger tip 200a in the injection sleeve 200, and is previously pressurized to a low pressure of, for example, 1.1 to 1.2 kg / cm ² . A pressurized gas such as an inert gas is supplied to the inert gas supply control device 8
When the gas is injected into the ladle 20 through the inert gas supply device 70 through the inert gas pipe 30 which is a pressurized gas supply line through 0, the molten metal surface in the ladle 20 is pressurized and flows through the conduit 28 to be discharged from the conduit 28. It falls from the tip 28a of the part and begins to be poured into the injection sleeve 200. At this time, in the present invention, the molten metal is filled in the ladle in a substantially filled state, and the pressurized gas injected into the ladle to pressurize the molten metal filled in the ladle is Since there is no extra space in the filled state, and therefore no extra gas, there is no pressure change, and the pressurized gas held at a preset predetermined pressure presses the molten metal surface while discharging that pressure, causing it to discharge. The supply of the pressurized gas is continued until a predetermined time set by the timer after the pressure in the ladle reaches the preset pressure, and after the timeout, the supply of the pressurized gas is stopped and the hot water supply operation is completed. Therefore, since the hot water supply work based on almost the same pressure waveform is repeated every time,
A stable amount of hot water is supplied with a constant amount of hot water, and product quality is made uniform. The inert gas is used in the temperature control device 9
A value close to the molten metal temperature due to 0, for example, 250 to 70
It is desirable to heat and supply to a constant temperature state within the range of 0 ° C.

When the pouring operation is started, the molten metal surface in the injection sleeve 200 begins to rise gradually. Therefore, after the tip 28a of the discharge part of the conduit 28 is immersed in this molten metal surface for about 20 mm, Radle 20 is raised so that conduit 28 rises at the same speed as the rising speed of the molten metal surface. Alternatively, after the tip 28a of the discharge portion of the conduit 28 is immersed in the molten metal surface by about 20 mm, the injection sleeve 200 is axially (inclined) at the same speed as the rising speed of the molten metal surface.
May be lowered to. By doing so, hot water is supplied into the injection sleeve 200 while maintaining the molten metal immersion depth of the discharge portion tip 28a at the above-mentioned constant value of about 20 mm. This dipping depth is preferably in the range of 20 mm to 50 mm, and it is preferable that the dipping depth be as small as possible because the amount of molten metal attached to the outer circumference of the conduit discharge side tip can be reduced. The above-described hot water supply amount control method, after filling the ladle with the molten metal, injects pressurized gas into the ladle to start discharging the molten metal, and starts the timer after the ladle pressure reaches the set value, Since the discharge is completed after a lapse of a certain period of time, in principle, a melt level detection sensor for measuring the melt level in the ladle is not necessary, but a melt level detection sensor is intentionally installed in the ladle. The actual molten metal flow may be confirmed by collating the fluctuation of the pressure waveform with the fluctuation of the molten metal surface in the ladle. As the molten metal liquid level detection sensor, for example, a molten metal level detection rod, a laser light sensor, or an ultrasonic sensor can be used. As another hot water supply method, a molten metal level detection sensor such as a molten metal level detection rod, a laser light sensor, or an ultrasonic sensor installed in the ladle 20 is used to supply a prescribed amount of molten metal to the ladle. Injection sleeve 20 in 20
It is also possible to adopt a method in which only one hot water supply amount to 0 is inhaled and all of this is supplied to the injection sleeve 200.

The above-mentioned series of work procedures (melting and holding furnace 1
Immersion of the ladle 20 in 0, suction of molten metal in the ladle by raising the valve rod 22, closing of the inlet 20c by lowering the valve rod, insertion of the tip 28a of the conduit discharge portion into the injection sleeve, ladle of pressurized gas (inert gas) It is also possible to input a sequence start / stop program for internal injection, rising of the conduit during hot water supply, stop of injection in the gas ladle, etc. in advance to the programmable controller and automatically continue the work according to this program. It is desirable that the oxide removing device 100 be used periodically every time the hot water is supplied several times to clean the outer circumference of the tip end portion 28a of the conduit discharge side to remove the generated molten oxide.

Further, when the hot water is supplied to the injection sleeve 200, if the immersion depth of the discharge-side tip end portion 28a of the conduit 28 is kept substantially constant, the molten metal is dropped into the injection sleeve 200. No splashes or splashes and little air entrapment. Further, the state of the molten metal adhering to the outside of the discharge-side tip portion 28a is constant every time, and the molten metal and the oxide adhered to the outside of the discharge-side tip portion 28a using the oxide removing device 100 each time the hot water supply is completed. By removing and cleaning the molten metal, almost no molten oxide is mixed in the molded product.

[0021]

As described above, in the sealed hot water supply apparatus of the present invention, there is almost no dripping during the transfer of the ladle,
Moreover, since the pressure fluctuation of the pressurized gas injected into the ladle for discharging the molten metal in the ladle is small, the hot water supply conditions are uniformly stabilized, and a predetermined amount of molten metal can be accurately executed every time only by detecting the internal pressure of the ladle. Since the molten metal liquid level detection sensor is not required and is accurately supplied to the injection sleeve, the accuracy of hot water supply is improved, and the molten metal in the ladle is supplied to the injection sleeve by the pressing force by the injection of pressurized gas such as inert gas. Since there is almost no mixing of oxides and air entrainment during pouring is prevented as much as possible, it is possible to continuously and stably supply high-quality cast products with no casting defects.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a closed water heater according to an embodiment of the present invention.

FIG. 2 is an enlarged vertical cross-sectional view of a main part of the sealed hot water supply device (during hot water supply) according to the embodiment of the present invention.

FIG. 3 is an enlarged vertical cross-sectional view of a main part of the sealed hot water supply device (during oxide removal cleaning) according to the embodiment of the present invention.

FIG. 4 is a front view of the oxide removing apparatus in a non-working state, which is taken along the line AA of FIG. 2.

5 is an enlarged longitudinal cross-sectional view of a main part of the sealed hot water supply device showing the position state of the oxide removing device during the work as viewed from BB in FIG.

FIG. 6 is a pressure waveform chart showing changes in the pressure inside the ladle during the hot water supply test according to the embodiment of the present invention.

FIG. 7 is a pressure waveform chart showing changes in the pressure in the ladle during hot water supply operation according to the embodiment of the present invention.

FIG. 8 is an explanatory diagram of a conventional hot water supply device.

FIG. 9 is an explanatory diagram of a conventional hot water supply device.

[Explanation of symbols]

 1 Closed Water Heater 10 Melt Holding Furnace 10a Crucible 20 Ladle 20a Canopy 20b Closed Lid 20c Suction Port 22 Valve Bar 24 Valve Bar Cylinder 24a Support 26 Laddle Support 28 Conduit 28a Discharge Tip (Discharge Side Tip) 30 Pressurized Gas Supply Line (inert gas pipe) 32 Pressure sensor (pressure gauge) 34 Flow rate adjusting valve 40 Opening / closing device 50 Building (or structure) 60 Laddle suspension supporting lifting cylinder 60a Piston rod 70 Inert gas supply device 80 Inert gas supply control device 90 Temperature Control Device 100 Oxide Removal Device 102 Support 110 Cleaning Tool Lifting Cylinder 120 Cleaning Tool Opening and Closing Cylinder 122 Cleaning Tool 200 Injection Sleeve 200a Plunger Chip

Claims (2)

[Claims] 1. A closed type hot water supply device for supplying a molten metal of an aluminum alloy or a magnesium alloy into an injection sleeve of a die casting machine or the like, which is immersed and suspended in a melting and holding furnace for the molten metal and provided so as to project to the side of the bottom. A ladle provided with an opening / closing device, which is provided outside the ladle body, having an opening / closing device having a suction port for molten metal which is opened upward and which is capable of blocking communication, and a valve rod and a valve rod cylinder for lifting and lowering the communication port, The ladle suspension supporting elevating / lowering means, a conduit having one end housed in the ladle and the other end projecting from the ladle and inserted into the injection sleeve for pouring the molten metal in the ladle to the injection sleeve; And a pressurized gas supply line equipped with a pressure sensor and a flow sensor for injecting a pressurized gas for pressurizing the surface of the molten metal in the ladle for discharging the molten metal. In a hot water supply method using a closed hot water supply device, the melt discharge side of the conduit is inclined downward, and the ladle suspension support elevating means is inclined parallel to the injection sleeve in which the elevating direction is inclined. Operate the ladle suspension support elevating means so that the liquid surface of the molten metal in the ladle immersed in the holding furnace is in contact with the lower surface of the sealing lid of the ladle to make the ladle stationary, and open the suction port to enter the ladle. After the molten metal is filled, the suction port is closed to transfer the ladle, the molten metal discharge side of the conduit is inserted into the injection sleeve, and then pressurized gas is injected into the ladle to melt the molten metal in the ladle. Is a method of supplying water to the injection sleeve by supplying a required amount of the hot water to the injection sleeve, wherein pressurized gas is injected into the ladle when hot water is supplied after the melt discharge side of the conduit is inserted into the injection sleeve. After,
The pressure sensor installed in the pressurized gas supply line detects the gas pressure in the ladle and injects the pressurized gas into the ladle for a predetermined time set by a timer after the detected pressure reaches a preset pressure. A hot water supply method for a hermetically sealed hot water supply apparatus, characterized in that the amount of hot water supplied to the injection sleeve is controlled by the above. 2. The hot water supply method for a hermetically sealed hot water supply apparatus according to claim 1, wherein the pressurized gas detection pressure when the molten metal first passes through the uppermost point of the conduit during hot water supply in several shots is measured in advance to obtain an average pressure. Calculated in advance, during injection of pressurized gas for the shot,
When the detected pressure in the ladle that rises after starting the injection reaches the set pressure in the range of 70% to 100% of the average pressure, it is set as the timer start time, and the timeout of the predetermined time set in the timer Continue to inject pressurized gas until
A hot water supply method for a sealed hot water supply device, characterized in that the amount of hot water supplied to the injection sleeve is controlled by stopping the injection of pressurized gas after a time-out.