JP2593351B2 - Hot water supply method and hot water supply device for molten metal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention quantitatively supplies a molten metal of a holding furnace holding a molten metal to equipment to be supplied outside the holding furnace by pressurizing the molten metal in the holding furnace. The present invention relates to a hot water supply method and a hot water supply device for molten metal for heating.

[Prior art and its problems] Conventionally, various ideas and inventions have been made regarding a pressurized water heater.

For example, JP-A-48-7843, JP-A-63-40661, Japanese Patent Application 63-168
546, Japanese Patent Application No. 63-307126, etc., and especially the method and apparatus based on Japanese Patent Application Laid-Open No. 48-7784 have been widely put into practical use worldwide, including Japan.

However, recent demands for technical development and improvement have become increasingly severe, and the demands for the accuracy of hot water supply and the reduction in the probability of occurrence of troubles (that is, the reduction of opportunity loss) have become particularly severe.

From such a viewpoint, FIGS. 5 to 7 show the above-mentioned JP-A-48-7843, JP-A-63-40661, and Japanese Patent Application No. 63-168.
Methods and apparatuses based on 546 and Japanese Patent Application No. 63-307126 have common weaknesses.

That is, in these methods, a valve such as an electromagnetic valve is used in one of two measurement chambers such as a diaphragm inside a pressure transmitter as a method of storing the pressure in the furnace when a sensor such as an electrode detects a molten metal. We use method to contain.

Then, the pressure increase amount after the detection of the molten metal by the sensor is recognized and controlled as a differential pressure.

In this case, since the amount of gas sealed in the measurement chamber using a valve such as an electromagnetic valve is limited and small, variations due to valve operating conditions (eg, valve operation delay, valve body movement, etc.) are regarded as absolute errors. Inevitably, the accuracy of hot water supply was limited to ± 2 to 3%.

In addition, the pipe of the furnace pressure conduit is divided around the pressure transmitter, and a considerably fine pipe is formed, for example, by incorporating a valve in the middle, and the behavior of the pipe such as clogging, leakage, water droplet dust, etc. is caused. Troubles were also seen.

Similarly, in practice, the valve is opened and closed three times a minute at the maximum, and the probability of failure from this point cannot be neglected. Further, in order to increase the productivity, the frequency of opening and closing the valve must be increased. From this point, there is one limit to the improvement of the productivity, that is, to the high cycle operation.

Further, basically, it is better to exclude parts requiring mechanical operation as much as possible in the entire apparatus.

[Object of the Invention] In view of the above-mentioned problems of the prior art, the present invention further improves the accuracy of hot water supply, reduces the frequency of failures, reduces the number of parts, enables a high cycle, and further improves productivity. It is an object of the present invention to provide a hot water supply method and a hot water supply apparatus for molten metal, which can perform hot water supply.

[Means for Solving the Problems] Hereinafter, an embodiment of the present invention will be described.

(1) FIG. 1 is a flow chart showing the concept of a method for supplying molten metal according to the claims.

The basic start of the molten metal hot water supply method according to the present invention is as follows. First, a measured value input unit, an external output unit for transmitting measured values in parallel to a separate recorder and the like, and an external remote input unit And a remote control unit for performing remote control based on an external input signal, and a local control which is usually manually set in advance from a bias control device numerical setting dial (volume). In the present invention, the external remote input value is remotely controlled. During the execution of the control, a local control unit that is automatically set as a local control value, a control switching signal receiving unit that performs switching between remote control and local control by an external pulse signal, and a bias value that is set in advance as described later. A bias value adding unit that adds a control value to each of the remote control and the local control, and control to which the bias value is added And a control value comparing / calculating unit for calculating a measured value input value, and a control output unit for outputting a control output to the outside based on the calculation result. Input and set, a hot water supply timer incorporated in the control panel (not shown) together with the bias control device and the temperature control device (not shown) or various safety protection devices, etc. Start by entering a value.

If the initial data of the bias value and the timer value are set, the system according to the present invention is in a standby state for a hot water supply command from a molten metal supply device such as a die casting machine, a die casting machine, or a sand casting machine.

When a control panel (not shown) receives a hot water supply command from the supplied device, pressurization of the pressurized hot water supply furnace is started.

FIG. 2 is a conceptual sectional view of one embodiment of the present invention. If the inside of the holding furnace 3 is pressurized with gas, the molten metal 5 rises in the hot water supply pipe 4.

As described above, when the pressurization of the pressurized water heater is started by the gas, the pressure of the pressurized water heater is measured by the pressure transmitter, and data is transmitted to the measured value input unit of the bias control device. The molten metal rises in the hot water supply pipe.

The measured value received at the measured value input unit is transferred to the control value comparison / calculation unit and output to the remote control unit via the remote input unit immediately after being output to the outside via the external output unit. The value is added as a value by the bias value adder, and the control value comparison calculator compares the magnitude with the transferred measurement value.

At this time, the control is performed as remote control unless a control switching command is issued from the outside by a pulse signal to the control signal switching unit.

When performing the above control value magnitude comparison under remote control,
Unless the bias set value is zero, the measured value is taken as the remote set value, the bias value is added, and the measured value is compared with the measured value. Becomes

The most appropriate (general) is determined by empirically determining the molten metal that has been rising in the hot water supply pipe while the pressurization is continued and is relatively empirically determined by a sensor such as an electrode, a metal passage sensor, or an electromagnetic sensor in a relative relationship with the device to be supplied. As close as possible to the outlet of the molten metal in the hot water supply pipe.) If detected at a fixed point of the hot water supply pipe, a pulse signal is sent to the control switching signal receiving section of the bias control device, and the control of the bias control device is remotely controlled. Is switched to local control.

At the same time, the supply of the molten metal is started after the hot water pipe fixed point on the basis of the hot water pipe fixed point, for example, the supply of the molten metal to the hot water supply gutter 6 in FIG. 2 is started.

As described above, in the present invention, the control setting value of the local control is not manually set from the bias control device numerical setting dial (volume), but the external remote input value is automatically set as the local setting value while the remote control is being executed. Since the setting is set, if the control is switched from the remote control to the local control, the measured value sampled immediately before the switching is transmitted to the local control unit via the remote input unit and the remote control unit and held as the local setting value. Have been.

Since the remote control circuit is disconnected as a control operation from the moment of switching from the remote control to the local control, the control value serving as a reference in the control value comparison / calculation unit is a measured value sampled immediately before the execution of the above-described switching. Is transmitted to the local control unit via the remote input unit and the remote control unit, and is fixed at a value obtained by adding a bias value previously input and set to a value held as a local set value.

Therefore, if the pressurization is continued, the measured value eventually reaches the local control value, and is output from the control output unit as a command to stop the pressurization, and the pressurization is stopped.

Simultaneously with the stop of pressurization, the hot water supply timer is started, and the time is up after elapse of the previously set timer time, the furnace internal pressure is discharged, and the supply of the molten metal is stopped.

Regarding the amount of pressure increase in the pressurized hot water supply furnace after the detection of the molten metal at the fixed point of the hot water supply pipe and the realization of the quantitative hot water supply within a certain period of time after the stop of the pressure increase, see page 7 of Patent Publication 64-6870. As described above, it can be said that it is clear from the study by the inventors of the present invention.

In this way, when the hot water supply is completed, a control panel (not shown) initializes the control conditions other than the bias value and the hot water supply timer value input as the initial data, the control circuit selection becomes remote control, and the supply destination device is returned again. It is in a standby state in response to a hot water supply command from.

Thereafter, hot water supply is repeated based on a hot water supply command from the supplied device, but the furnace pressure that fluctuates every time when the molten metal reaches the hot water supply pipe fixed point is reliably and accurately captured,
The absolute value control of the pressure increase amount in the pressurized hot water supply furnace after the molten metal has passed through the hot water supply pipe fixed point is performed every time, and a highly accurate hot water supply method is realized.

(2) FIG. 2 is a conceptual sectional view relating to the claims.
In the figure, a heat insulating furnace 3 is a heating source such as a rod-shaped resistance heating element.
The temperature control device in the hot water supply device control panel (not shown) controls the thermocouple in the thermocouple protection tube 8 so that the measured temperature of the molten metal 5 becomes constant.

The hot water supply pipe 4 has an inlet 41 for the molten metal immersed in the molten metal 5 held in the holding furnace 3 and supplies the molten metal to an apparatus to be supplied such as a die casting machine (not shown) outside the furnace. Outlet of molten metal at a position in contact with hot water supply gutter 6
A conductive material having a thermocouple immersed in the molten metal 5 in the holding furnace 3 by being brought into contact with the molten metal 5 rising in the hot water supply pipe 4 at the outlet 42; There is provided an electrode 7 serving as a positive electrode capable of detecting a molten metal by conducting electricity between the thermocouple protection tube 8 serving as a negative electrode and the thermocouple protecting tube 8 serving as a negative electrode.

The holding furnace 3 has an opening 27 for cleaning and inspecting the inside and receiving a molten metal from the outside, and a lid 28 for sealing the opening 27. The operation using the part 27 is performed, and the holding furnace 3 is sealed during the operation.

The holding furnace 3 is connected to a pressurizing source 17 such as a compressed air or an inert gas cylinder on a side wall or a ceiling portion at a position higher than the holding position at the time of holding the maximum amount of the molten metal 5 so as to open and close a pipeline on the way. Pressurizing tube 13 equipped with a pressurizing valve 15
And an exhaust port 11 connected to an exhaust pipe 14 equipped with an exhaust valve 16 for opening and closing a pipe in the middle, which is opened to the outside atmosphere to discharge the internal pressure.
The bias control device 1 measures the pressure in the holding furnace 3
And a pressure measurement port 9 connected to a pressure measurement pipe 12 connected to a measurement port of the pressure transmitter 2 for transmitting a measured value to the pressure transmitter 2.

The bias control device is installed in a hot water supply device control panel (not shown), and the thermocouple protection tube 8 serving as a negative pole, the exhaust valve 16, the pressurizing valve 15, the pressure transmitter 2, and It is electrically connected to the electrode 7 as a positive electrode.

A bias value of the initial data is input and set to the bias control device 1, a hot water supply timer value is input and set to a hot water supply timer in a hot water supply device control panel (not shown), and a hot water supply command is issued from a supplied device (not shown), When a hot water supply device control panel (not shown) receives the signal, the inside of the holding furnace 3
Gas pressurizing valve 15 and pressurizing port via pressurizing pipe 13
Pressurized by inflow from 10.

When the inside of the holding furnace 3 is pressurized, the molten metal 5 flows into the hot water supply pipe from the inlet 41 of the molten metal of the hot water supply pipe 4, and the pressure in the holding furnace 3 is measured by the pressure measuring pipe connected to the pressure measuring port 9. It is measured from time to time by the pressure transmitter 2 via 12 and transmitted to the bias controller.

In this manner, as described in the claim (1), the holding furnace 3 is continuously pressurized until the molten metal is detected by the positive electrode 7 based on the remote control of the bias control device.

Eventually, the molten metal 5 that has risen inside the hot water supply pipe 4 by the positive electrode 7 is detected at the outlet 42 of the molten metal, and a detection signal is sent to the bias control device 1 as a pulse signal in a hot water supply device control panel (not shown). Then, the control of the bias control device 1 is switched to the local control.

Then, as described in the claim (1), the holding furnace 3 completes the absolute value control of the pressure increase amount after the molten metal 5 is detected by the positive electrode 7, and The pressurizing valve 15 mounted on the way closes and pressurization is stopped, and the exhaust valve mounted on the exhaust pipe 14 after the hot water timer in the hot water supply device control panel (not shown) times out.
16 is released, the pressure in the holding furnace 3 returns to the atmospheric pressure, and the molten metal 5 rising in the hot water supply pipe 4 returns to the holding furnace 3 from the inlet 41 of the molten metal, and Hot water supply to the apparatus via the hot water supply gutter 6 is completed.

Thus, as described in claim (1), the hot water supply apparatus according to the claims uses a molten metal hot water supply method based on the claims, thereby providing hot water supply with high repetition accuracy, less trouble, and high cycle hot water supply. It is realized as a device to realize.

(3) FIG. 3 is a conceptual sectional view relating to claims.
In the figure, a heat insulating furnace 3 is a heating source such as a rod-shaped resistance heating element.
The temperature control device in the hot water supply device control panel (not shown) controls the thermocouple in the thermocouple protection tube 8 so that the measured temperature of the molten metal 5 becomes constant.

The hot water supply pipe 4 has an inflow port 41 for the molten metal immersed in the molten metal 5 held in the holding furnace 3, and is connected to the lower port 35 of the die casting machine plunger sleeve 33. An electromagnetic sensor 30 having an outlet 42 and comprising an electrode sensor main body 30a and an amplified pulse transmitter 30b mounted on the outer periphery of the hot water supply pipe 4 as close as possible to the outlet 42 is mounted. ing.

The holding furnace 3 has an opening 27 for cleaning and inspecting the inside and receiving a molten metal from the outside, and a lid 28 for sealing the opening 27. The operation using the part 27 is performed, and the holding furnace 3 is sealed during the operation.

The holding furnace 3 is connected to a pressurizing source 17 such as a compressed air or an inert gas cylinder on a side wall or a ceiling portion at a position higher than the holding position at the time of holding the maximum amount of the molten metal 5 so as to open and close a pipeline on the way. Pressurizing tube 13 equipped with a pressurizing valve 15
And an exhaust port 11 connected to an exhaust pipe 14 equipped with an exhaust valve 16 for opening and closing a pipe in the middle, which is opened to the outside atmosphere to discharge the internal pressure.
The bias control device 1 measures the pressure in the holding furnace 3
And a pressure measurement port 9 connected to a pressure measurement pipe 12 connected to a measurement port of the pressure transmitter 2 for transmitting a measured value to the pressure transmitter 2.

The bias control device is mounted in a hot water supply device control panel (not shown), and is electrically connected to the electromagnetic sensor 30, the pressure valve 15, the exhaust valve 16, and the pressure transmitter 2.

A bias value of the initial data is input and set to the bias control device 1, a hot water supply timer value is input and set to a hot water timer in a hot water supply device control panel (not shown), and a hot water supply command is issued from a supplied device (not shown). When a hot water supply device control panel (not shown) receives the signal, the inside of the holding furnace 3
Gas pressurizing valve 15 and pressurizing port via pressurizing pipe 13
Pressurized by inflow from 10.

When the inside of the holding furnace 3 is pressurized, the molten metal 5 flows into the hot water supply pipe from the inlet 41 of the molten metal of the hot water supply pipe 4, and the pressure in the holding furnace 3 is measured by the pressure measuring pipe connected to the pressure measuring port 9. It is measured from time to time by the pressure transmitter 2 via 12 and transmitted to the bias controller.

Thus, as described in claim (1), pressurization of the holding furnace 3 is continued until the molten metal is detected by the electromagnetic sensor 30 based on the remote control of the bias control device.

Eventually, the molten metal 5 rising in the hot water supply pipe 4 by the electromagnetic sensor 30 is detected at the outlet 42 of the molten metal,
The detection signal is transmitted to the bias control device 1 as a pulse signal in a hot water supply device control panel (not shown), and the control of the bias control device 1 is switched to local control.

Then, as described in claim (1), the holding furnace 3 completes the absolute value control of the pressure increase amount after the molten metal 5 is detected by the electromagnetic sensor 30, and the pressurizing pipe 13
The pressurizing valve 15 provided in the middle is closed and pressurization is stopped, and after the hot water supply timer in the hot water supply device control panel (not shown) times out, the exhaust valve 16 mounted on the exhaust pipe 14 is opened and held. The pressure in the furnace 3 returns to the atmospheric pressure, and the hot water pipe 4
The molten metal 5 which has risen in the inside returns to the holding furnace 3 from the inlet 41 of the molten metal, and the supply of the molten metal to the supply target device such as the die casting machine plunger sleeve 33 is completed.

Thus, as described in claim (1), the hot water supply apparatus according to the claims uses a molten metal hot water supply method based on the claims, thereby providing hot water supply with high repetition accuracy, less trouble, and high cycle hot water supply. It is realized as a device to realize.

(4) FIG. 4 is a conceptual sectional view relating to the claims.
In the figure, a heat insulating furnace 3 is a heating source such as a rod-shaped resistance heating element.
The temperature control device in the hot water supply device control panel (not shown) controls the thermocouple in the thermocouple protection tube 8 so that the measured temperature of the molten metal 5 becomes constant.

The hot water supply pipe 4 is immersed in the molten metal 5 held in the holding furnace 3, has an inlet 41 for the molten metal, and is provided at a position in contact with the side receiving port 45 of the die casting machine plunger sleeve 33. An electromagnetic wave is provided on the outer periphery of the hot water supply pipe 4 having an outlet 42 for the molten metal and located at a position as close as possible to the outlet 42 (in the drawing, a position separated for convenience). An electromagnetic sensor 30 including a sensor main body 30a and an amplified pulse transmitter 30b is mounted.

The holding furnace 3 has an opening 27 for cleaning and inspecting the inside and receiving a molten metal from the outside, and a lid 28 for sealing the opening 27. The operation using the part 27 is performed, and the holding furnace 3 is sealed during the operation.

The holding furnace 3 is connected to a pressurizing source 17 such as a compressed air or an inert gas cylinder on a side wall or a ceiling portion at a position higher than the holding position at the time of holding the maximum amount of the molten metal 5 so as to open and close a pipeline on the way. Pressurizing tube 13 equipped with a pressurizing valve 15
And an exhaust port 11 connected to an exhaust pipe 14 equipped with an exhaust valve 16 for opening and closing a pipe in the middle, which is opened to the outside atmosphere to discharge the internal pressure.
The bias control device 1 measures the pressure in the holding furnace 3
And a pressure measurement port 9 connected to a pressure measurement pipe 12 connected to a measurement port of the pressure transmitter 2 for transmitting a measured value to the pressure transmitter 2.

The bias control device is mounted in a hot water supply device control panel (not shown), and includes an electromagnetic sensor 30 and an exhaust valve.
16, the pressurizing valve 15 and the pressure transmitter 2 are electrically connected.

A bias value of the initial data is input and set to the bias control device 1, a hot water supply timer value is input and set to a hot water supply timer in a hot water supply device control panel (not shown), and a hot water supply command is issued from a supplied device (not shown), When a hot water supply device control panel (not shown) receives the signal, the inside of the holding furnace 3
Gas pressurizing valve 15 and pressurizing port via pressurizing pipe 13
Pressurized by inflow from 10.

When the inside of the holding furnace 3 is pressurized, the molten metal 5 flows into the hot water supply pipe from the inlet 41 of the molten metal of the hot water supply pipe 4, and the pressure in the holding furnace 3 is measured by the pressure measuring pipe connected to the pressure measuring port 9. It is measured from time to time by the pressure transmitter 2 via 12 and transmitted to the bias controller.

Thus, as described in claim (1), pressurization of the holding furnace 3 is continued until the molten metal is detected by the electromagnetic sensor 30 based on the remote control of the bias control device.

Eventually, the molten metal 5 rising inside the hot water supply pipe 4 by the electromagnetic sensor 30 is detected near the outlet 42 of the molten metal, and a detection signal is transmitted to the bias control device 1 as a pulse signal in a hot water supply device control panel (not shown). Then, the control of the bias control device 1 is switched to local control.

Then, as described in claim (1), the holding furnace 3 completes the absolute value control of the pressure increase amount after the molten metal 5 is detected by the electromagnetic sensor 30, and the pressurizing pipe 13
The pressurizing valve 15 provided in the middle is closed and pressurization is stopped, and after the hot water supply timer in the hot water supply device control panel (not shown) times out, the exhaust valve 16 mounted on the exhaust pipe 14 is opened and held. The pressure in the furnace 3 returns to the atmospheric pressure, and the hot water pipe 4
The molten metal 5 which has risen in the inside returns to the holding furnace 3 from the inlet 41 of the molten metal, and the supply of the molten metal to the supply target device such as the die casting machine plunger sleeve is completed.

Thus, as described in claim (1), the hot water supply apparatus according to the claims uses a molten metal hot water supply method based on the claims, thereby providing hot water supply with high repetition accuracy, less trouble, and high cycle hot water supply. It is realized as a device to realize.

As described above, various hot water supply devices utilizing the hot water supply method according to the claims can be considered.
It can be naturally applied as a hot water supply method in the holding hot water supply room of the melting and holding hot water supply furnace according to the invention based on.

Further, in the claims and the claims, an electromagnetic sensor is described as a sensor for detecting the molten metal. However, this is not only an electromagnetic sensor but also a metal passage sensor or the like that accurately detects the arrival of the molten metal from outside the hot water supply pipe. Any sensor can be used as long as it can transmit an electric signal to the bias control device.

Further, various shapes of the holding furnace can be considered as long as the holding furnace can withstand the pressure in the furnace, can hold the molten metal safely and can maintain a constant temperature.

And it is naturally possible to apply the continuous hot water receiving device described in Patent Publication 64-6867, or the solid metal inlet described in Patent Publication 64-6868, to the claims of the present invention, and the hot water supply device. is there.

[Effects of the Invention] A hot water supply method for a pressurized water heater based on the present invention,
Regarding the hot water supply method based on -7843, the applicant uses an experimental machine owned by the applicant in the factory owned by the applicant, and is relatively easy to influence the quantity of solidified pieces on the gutter in the hot water weight accuracy for comparison purposes for comparison purposes 500 grams The following shows hot water supply experiment data for the following hot water supply and hot water supply of around 2,000 grams, which is generally used most frequently in foundries.

Conventional type less than 500 grams.

Number of documents 101 Maximum 160.0 grams Minimum 130.0 grams Average 144.2 grams Difference 50.0 grams Accuracy 20.8 (full range) Standard deviation 6.85 grams 2 σ ± 9.50% 500 grams or less.

Number of documents 90 pieces Maximum 270.0 grams Minimum 225.0 grams Average 245.8 grams Difference 45.0 grams Accuracy 18.3 (full range) Standard deviation 9.66 grams 2 σ ± 7.86% Conventional formula around 2000 grams.

Number of documents 60 pieces Maximum value 2080.0 grams Minimum value 1960.0 grams Average value 2008.8 grams Difference 120.0 grams Accuracy 5.97 (full range) Standard deviation 24.29 grams 2 σ ± 2.42% Around 2000 grams.

Number of documents 60 pieces Maximum value 1445.0 grams Minimum value 1395.0 grams Average value 1420.8 grams Difference 50.0 grams Accuracy 3.52 (full range) Standard deviation 12.53 grams 2 σ ± 1.76% 500 grams or less.

Number of documents 80 items Maximum value 2020.0 g Minimum value 1940.0 g Average value 1970.4 g Difference 80.0 g Accuracy 4.06 (full range) Standard deviation 16.27 g 2 σ ± 1.65% Experiment with the applicant's own experimental machine in the factory owned by the applicant As is evident from the data, a hot water supply method and a hot water supply apparatus for molten metal that realizes high-cycle hot water supply with less repetition accuracy and less trouble in the pressurized hot water supply furnace are realized.

[Brief description of the drawings]

FIG. 1 is a flow chart showing the concept of a method for supplying molten metal according to the claims, FIG. 2 is a conceptual sectional view relating to the claims,
FIG. 3 is a conceptual sectional view relating to the claims, FIG. 4 is a conceptual sectional view relating to the claims, and FIG.
FIG. 6 is a conceptual sectional view relating to the invention of 40661, and FIG.
FIG. 7 is a conceptual sectional view relating to the invention of 8-7843, and FIG. 7 is a conceptual sectional view relating to the inventions of Japanese Patent Application Nos. 63-168546 and 63-307126. 1 ... bias control device, 2 ... pressure transmitter, 3 ... holding furnace, 4 ... hot water supply pipe, 5 ... molten metal, 6 ... hot water supply gutter,
7 ... electrode, 8 ... thermocouple protection tube, 9 ... pressure measurement port,
10 ... Pressure port, 11… Exhaust port, 12… Pressure measurement tube, 13…
... Pressure tube, 14 ... Exhaust tube, 15 ... Pressure valve, 16 ... Exhaust valve, 17 ... Pressure source, 26 ... Heating source, 27 ... Opening, 28 ... Lid, 30a ... Electromagnetic sensor body, 30b… Amplified pulse transmitter, 30… Electromagnetic sensor, 33… Die casting machine plunger sleeve, 35 …… Lower receiving port, 41 …… Inlet, 42 …… Outlet, 45 …… Side In the drawings, the same reference numerals indicate the same or corresponding parts.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-173621 (JP, A)

Claims (4)

(57) [Claims] In a hot water supply method for a pressurized hot water supply furnace, a furnace pressure value measured and transmitted by a pressure transmitter is taken as an input signal from a measurement value input section, and is transferred to a control value comparison / calculation unit and externally output. The remote control value obtained by adding the bias value (variable set deviation value) set in advance to the remote input unit is immediately transferred to the remote input unit, and the remote control value is transferred as the control set value. The input signal and the control set value are subjected to remote control for comparing and calculating the magnitude in a control value comparison / calculation unit, and the pressurization is continued, and the supply of molten metal that rises in the hot water supply pipe due to pressurization in the furnace. The remote control is switched to the local control according to the detection signal of the sensor installed at the control position, and the remote input value immediately before is self-held as a setting fixed value for the local control. By adding the set bias value, the magnitude comparison is repeated as the magnitude comparison set value, and the furnace pressure value measured and transmitted from the pressure transmitter is switched to the local control. At the same time when the control value obtained by adding the bias value is reached, the pressurization into the furnace is stopped at the same time, and a fixed amount of hot water is supplied by exhausting the furnace pressure after the elapse of the preset time of the hot water supply timer. Hot water supply method of molten metal. 2. An apparatus for carrying out a method for supplying molten metal according to claim 2, comprising: a bias control device;
A pressure transmitter for measuring and transmitting the pressure to the bias control device, and a metal melt held therein. The metal melt has an inflow port for the metal melt and supplies the metal melt to equipment to be supplied outside the furnace. A hot water supply pipe having an outlet for the molten metal in contact with a hot water supply gutter, a heat source for keeping the temperature of the retained molten metal constant, and measuring the temperature of the molten metal. A thermocouple protection tube having a role of an electrode as a negative electrode having conductivity and having a thermocouple inside therein is installed, and the electrode as the negative electrode is provided at the outlet of the molten metal of the hot water supply pipe. Attach an electrode as a positive electrode to detect the molten metal rising in the opposed hot water supply pipe at a fixed point of the hot water supply pipe, and connect it to a pressurized source such as compressed air or an inert gas cylinder for pressurizing the inside and Pressure valve for opening and closing the pipeline Has equipped with pressure tube and connected pressure port, an exhaust pipe connected to an exhaust port equipped with an exhaust valve for opening and closing a pipe in the middle is opened to the outside,
Equipped with a pressure measurement port connected to a pressure measurement pipe connected to the measurement port of the pressure transmitter, and an opening for cleaning or inspecting the inside or receiving molten metal from the outside and the opening. A hot water supply device comprising: a holding furnace having a lid for sealing a part. 3. An apparatus for carrying out a method for supplying molten metal according to claim 1, comprising: a bias control device;
A pressure transmitter for measuring and transmitting pressure to the bias control device, and a die casting machine that holds a metal melt, has an inlet for the metal melt in the metal melt, and is an external metal melt supply device. A hot water supply pipe having an outlet for the molten metal connected to the plunger sleeve lower receiving port is mounted, a heat source for keeping the temperature of the molten metal constant is mounted, and the temperature of the molten metal is measured. A thermocouple protection tube having a thermocouple inside is mounted, and an electromagnetic sensor for detecting the passage of the molten metal inside is installed at a fixed point of the hot water pipe outside the hot water pipe near the outlet of the molten metal of the hot water pipe. Has a pressurizing port connected to a pressurizing pipe connected to a pressurizing source such as compressed air or an inert gas cylinder for pressurizing the inside and equipped with a pressurizing valve for opening and closing a pipe line on the way; To open and close the pipeline on the way It has an exhaust port connected to an exhaust pipe equipped with an exhaust valve, and is equipped with a pressure measuring port connected to a pressure measuring pipe connected to the measuring port of the pressure transmitter to clean or inspect the inside. A hot water supply apparatus comprising: an opening for receiving molten metal from the outside and a holding furnace having a lid for sealing the opening. 4. An apparatus for carrying out a method for supplying molten metal according to claim 1, comprising: a bias control device;
A pressure transmitter for measuring and transmitting pressure to the bias control device, and a die casting machine that holds a metal melt, has an inlet for the metal melt in the metal melt, and is an external metal melt supply device. To install a hot water supply pipe having an outlet for the molten metal in contact with the plunger sleeve side receiving port, to attach a heat source for keeping the temperature of the molten metal constant, and to measure the temperature of the molten metal. A thermocouple protection tube with a thermocouple inside is installed, and an electromagnetic sensor that detects the passage of the internal molten metal is installed at a fixed point on the outside of the hot water pipe near the metal melt outlet of the hot water pipe. And has a pressurized port connected to a pressurized pipe equipped with a pressurized valve for opening and closing the pipeline on the way connected to a pressurized source such as compressed air or an inert gas cylinder for pressurizing the inside, Open to the outside and open and close the pipeline on the way It has an exhaust port connected to an exhaust pipe equipped with an exhaust valve, and is equipped with a pressure measuring port connected to a pressure measuring pipe connected to the measuring port of the pressure transmitter to clean or inspect the inside. A hot water supply apparatus comprising: an opening for receiving molten metal from the outside and a holding furnace having a lid for sealing the opening.