JPS63165062A - Melting, holding and feeding furnace - Google Patents

Abstract

PURPOSE:To stabilize molten metal feeding quality and to improve feeding efficiency by providing a melting zone which melts and stores metal ingots continuously to a titled furnace and disposing a holding and feeding zone having a pressurized holding and feeding chamber and receiving chamber in combination with said zone. CONSTITUTION:A melting deck 4 is provided in a melting chamber 2 and a storage tank 5 is formed. A heating element 9 is installed over the entire surface in the upper part of the melting chamber 2 to melt the metal ingots 1 continuously. The molten metal is stored as the molten metal 6 in the storing chamber 5. The molten metal 6 is controlled in temp. by a device 15 for controlling the temp. of the melting chamber and is further pressurized and supplied to the holding and feeding chamber 40. The molten metal is further pressurized and is supplied to the holding and feeding chamber 40 from which the molten metal is fed through a molten metal outflow port 46 to a pouring machine under the control of a central control unit 66 for the holding and feeding chamber. The clean molten metal 6 from which oxide, etc., are removed is thereby stably fed to the casting machine with the high accuracy upon request from the casting machine. The feeding quality is thus stabilized and the feeding efficiency is improved.

Description

[Detailed description of the invention] [Industrial application fields] The present invention relates to a melting and holding hot water supply furnace.

[Prior Art] Conventionally, various processes have been known in which a solid metal such as an ingot is melted, the molten metal is supplied to a mold, etc., and a casting is produced.

For example, as shown in FIG. 3, solid metal is melted on a melting deck 73 using a combustion device (burner), oxides etc. are generally removed in a weir 76, and the solid metal is accelerated in a storage tank 75, Salary! 1
Die casting machine plunger sleeve 7 using 177
The process of supplying to a 0-grade casting machine.

Alternatively, as shown in FIG. 4, the solid metal may be melted in advance in a melting furnace (not shown), and the molten metal may be poured into a ladle 79.
The molten metal is transported using a transportation device such as the above, received from the receiving port 81, and supplied under pressure from a sealed holding furnace using a quantitative supply device.
Die casting machine plunger sleeve 7 through gutter 84
The process of supplying to a casting machine such as 0.

[Problems with conventional technology] Conventionally, solid metals such as ingots are melted,
The process of producing castings by supplying molten metal to molds, etc. is gradually becoming unsuitable for the current situation where industrial demands for high-mix, low-volume production and high-quality cast products have become stronger. There is.

For example, in the case shown in Figure 3, although this is a method that has become rapidly popular in recent years, the amount of gas components absorbed into the molten metal actually reaches a limit value due to the fact that combustion equipment is used for melting. There is a tendency.

Although weirs are used to reduce the amount of oxides brought into the storage tank, it is difficult to completely prevent the oxides that are generated in large quantities, and the molten metal does not have time to settle down. Since hot water flows into the storage tank and is supplied from the top of the storage tank using a water heater, it is unavoidable that oxides, etc. floating in the top of the storage tank are brought into the casting machine at the same time as the molten metal, making it difficult to produce high-quality castings. is difficult to adapt to.

Further, in the case of the method shown in FIG. 4, although there is no problem in terms of the quality of the molten metal, it is necessary to have a separate melting furnace, and moreover, from the viewpoint of efficiency, it is necessary to use a large centralized melting furnace. Therefore,
It is difficult to keep up with the diversification of alloy components in castings.
However, there is a problem in that it is difficult to respond immediately to production increases and decreases in production planning.

[Object of the Invention] In view of the above-mentioned conventional problems, the present invention provides a method for continuously melting metal lumps in a safe and stable manner once the metal lumps are introduced through the inlet, and discontinuing the melting. Oxides, etc. generated when melting the molten metal stored in the storage tank,
The casting machine requires the cleanest part of the molten metal to be moved to the holding hot water supply chamber and stably held in the holding hot water supply chamber while maintaining cleanliness without being contaminated by foreign substances derived from furnace materials, etc. The purpose of the present invention is to provide a melting and holding hot water supply furnace that can supply hot water sequentially according to the amount.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a melting zone having an inlet for introducing metal lumps, a melting deck for melting, and a hot water storage tank for storing the melted metal. It has a melting chamber pressurizing port whose opening and closing are controlled by signals from an external melting chamber pressurizing control device, and a melting chamber outlet for discharging the pressure in the melting zone by signals from the melting chamber pressurizing control device. a hot water supply chamber communicated with the iWA storage tank; a temperature measuring tube having a temperature sensor for detecting the pressure of a molten metal inlet located in the temperature measuring chamber and overflowing to an external molten metal outlet; A melting zone consists of a melting chamber differential pressure control unit that measures pressure, and a receiving port for receiving overflowing molten metal via a temperature gutter is created by pressurizing the melting zone with compressed gas. A holding hot water supply chamber that is located in contact with the temperature measuring gutter and has a hot water receiving pipe with a molten metal outlet located in the hot water receiving chamber, and for communicating and holding the molten metal received through the hot water receiving chamber with the hot water receiving chamber. and a holding hot water supply chamber pressurizing port whose opening and closing are controlled by an external holding hot water supply rich pressure control device, and a holding hot water supply chamber for discharging the pressure in the holding hot water supply zone to the outside by a signal from the holding hot water supply chamber pressurization control device. A hot water supply pipe having a chamber discharge port, a hot water inlet located in the holding hot water supply chamber, and a hot water supply sensor that detects the start pressure of hot water supply at the molten metal outlet outside the furnace, and a holding hot water supply whose pressure is measured by a signal from the hot water supply sensor. The present invention is characterized in that it is equipped with a holding hot water feeding zone composed of a room differential pressure control section and a holding hot water feeding zone, thereby establishing a melting holding hot water feeding furnace.

[Examples] Examples of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 are diagrams showing the structure of a melting and holding hot water supply furnace according to an embodiment of the present invention. In the figure, the melting, holding and feeding furnace consists of several types of furnace materials, regular and irregular, that have fire resistance and heat insulation properties, and includes a melting chamber 2 in which a metal ingot l is melted, and a melting chamber 2 in which a metal ingot l is melted, and a melting chamber 2 in which a metal lump l is melted, It is formed of a melting zone formed from a hot water supply chamber 3 etc. for temperature measurement, a hot water receiving chamber 55 for receiving the molten metal whose temperature is measured, and a holding hot water supply chamber 40 for holding the molten metal and supplying it to the casting machine. It consists of a holding hot water supply zone and a hot water supply zone.

The metal lump 1 is an ingot of a size suitable for melting and the like. The melting chamber 2 is formed into a closed box shape, and inside thereof is a melting deck 4 formed in the shape of a table for placing the metal lump 1, and a hot water storage tank 5 for storing the molten metal.
is formed. The upper surface position of the melting deck 4 is as follows:
It is formed in the middle of the melting chamber 2 in the height direction and is slightly inclined (approximately 5 degrees) toward the hot water storage tank 5 side, and the molten metal flows into the hot water storage tank 5 and is stored as molten metal (molten metal) 6. It looks like this. In this embodiment, the ratio of the bottom area occupied by the melting deck 4 and the hot water storage tank 5 is approximately 6:4. On the upper side wall of the melting chamber 2 on the side where the melting deck 4 is formed,
An inlet 7 for the metal lump 1 is formed, and a lid 8 is provided to cover and seal the inlet 7 from the outside. A resistance-type melting chamber heating element 9 such as a panel heater made of rod-shaped silicon carbide or nichrome wire is provided on the entire upper surface of the melting chamber 2, and this melting chamber heating element 9 is connected to a power source (not shown). has been done.

In the melting chamber 2, an atmosphere temperature measuring element 1 is provided, which penetrates the upper wall of the melting chamber 2 and has a detection end disposed near the metal lump l inside.
0 and a melting chamber molten metal temperature measuring body 11 which diagonally penetrates the lateral side wall thereof and whose detection end is disposed within the molten metal 6 of the hot water storage tank is provided. Further, the melting chamber 2 is provided with a melting chamber molten metal level sensor 12 which penetrates the upper wall thereof and whose detection end is disposed near the upper surface of the molten metal 6 in the hot water storage tank 5. and,
The above-mentioned ambient temperature temperature sensor 10 and melting chamber molten metal temperature sensor 11
This means that the melting chamber molten metal level sensor 12 is directly controlled by a melting chamber temperature control device (programmable controller or sequencer) 15 via a melting chamber temperature controller 13 and a melting chamber overheat alarm meter 14, respectively. It is connected. The ambient temperature measuring element 10 detects the ambient temperature near the metal lump 1 on the melting deck, and the melting chamber molten metal temperature measuring element 11 detects the temperature of the molten metal 6. Then, the melting chamber temperature control device 15 performs temperature control by comparing the detected temperature with the temperatures set by the melting chamber temperature controller 13 and the melting chamber overheat alarm meter 14, respectively.

That is, the melting chamber temperature control device 15 controls the amount of heat supplied to the melting chamber heating element 9 based on the comparison temperature (for example, the PI
Temperature control # (including overheating prevention, etc.) by
I do. Furthermore, the temperature control device 15 detects the level of the molten metal in the hot water storage tank 5 using the melting chamber molten metal level sensor 12, thereby preventing over-melting so that the molten metal does not rise above the melting deck 4.

The hot water supply chamber 3 is sealed and formed into a box shape that is slightly smaller than the melting chamber 2, and is integrally formed with the hot water storage tank 5 on the side wall of the melting chamber 2, communicating with the hot water tank 5 with the bottom surface at a common level. ing. Further, the hot water supply chamber 3 is formed higher than the upper surface of the melting deck 4 and slightly lower than the melting chamber 2.

That is, the hot water supply chamber 3 and the hot water storage chamber 5 form a molten metal tank that communicates with each other in a long manner and stores the molten metal 6. In this embodiment, the ratio of the floor area occupied by the hot water storage tank 5 and the hot water supply chamber 3 is about 2:1. The total storage volume of the hot water storage tank 5 and the hot water supply chamber 3 is formed to be a sufficient volume when all the metal lumps 1 are melted.

Further, in the upper part of the melting chamber 2, there are provided a melting chamber pressurizing port 16 for introducing gas and pressurizing the melting zone, and a melting chamber exhaust port 17 for discharging the gas and releasing the pressure. The melting chamber pressurizing port 16 is piped externally and is connected to a pressurizing source 19 with a melting chamber pressurizing valve 18 interposed therebetween. This pressurization source 19 is, for example, a device capable of supplying pressurized gas such as air compressed by a compressor or an inert gas. The melting chamber pressurizing valve 18 is a solenoid valve or the like that opens and closes based on a predetermined control signal from a melting chamber pressurizing control device 20, which will be described later. Further, the melting chamber exhaust port 17 is externally connected to a melting chamber exhaust valve 21 by piping, and is opened to the atmosphere. Above melting chamber exhaust valve 2
Reference numeral 1 denotes a solenoid valve or the like that opens and closes based on a predetermined control signal of the melting chamber pressurizing port 8 device 20.

A melting chamber pressure measurement port 22 is provided at the upper part of the hot water supply chamber 3 to measure its internal pressure.

This melting chamber pressure measurement port 22 is externally connected to a melting chamber differential pressure transmitter 24 via piping. This dissolution chamber differential pressure transmitter 24 has two measurement chambers 24a.

241), one measurement chamber 24a is directly connected to the piping, and the other measurement chamber 24b is connected with a solenoid valve 25 interposed in the middle of the piping, and the two measurement chambers 24a,
The difference in pressure applied to the measurement chamber 24b is detected. The dissolution chamber differential pressure transmitter 24 is a dissolution chamber differential pressure regulator 26.
and the two constitute a dissolution chamber differential pressure detection section. Further, the melting chamber pressure measurement port 22 is connected to a melting chamber pressure regulator 27.
It is connected to the. The melting chamber pressure regulator 26, the melting chamber pressure regulator 27, the melting chamber pressurizing valve 18, the melting chamber exhaust valve 21, and the electromagnetic valve 25 are controlled to pressurize the melting chamber so that predetermined controls are performed, respectively. It is connected to the device 20.

The melting chamber temperature control device 15 and the melting chamber pressure control device 20
is controlled by the dissolution chamber central control device 32. This melting chamber central control device 32 responds to a temperature measurement request from a holding hot water supply room central control device 66, which will be described later, by controlling the melting chamber temperature control device 1.
5 and the melting chamber pressurization control device 20. That is, when there is a temperature measurement request, if the molten metal 6 is not sufficiently stored or the molten metal temperature is not appropriate, the melting chamber pressurization control device 20 does not pressurize. In addition, even if there is a request for temperature measurement, metal lumps,
When there is no molten metal 6, an instruction to add metal lump 1 is issued.

Further, the hot water supply chamber 3 is provided with a temperature measuring tube 28 made of a heat-resistant material such as ceramics. The temperature measuring tube 28 has one end opened at the middle layer on the bottom side of the hot water supply chamber 3 as a molten metal inlet 29, and the other end opened at the upper part of the hot water supply chamber 3 as a molten metal outlet 30. The molten metal outlet 30 is provided with a temperature sensor 31 configured of one of an electrode type, photoelectric type, sonic type, electromagnetic type, and the like. The temperature sensor 31 detects the passage of the molten metal and transmits it to the melting chamber pressurization control unit 20. Molten metal outlet 30 is temperature gutter 5
0 to the hot water receiving pipe 49.

The hot water receiving pipe 49 is connected to the hot water receiving port 53 in contact with the temperature measuring gutter 50.
, and the molten metal outlet 54 is located within the receiving chamber 55. An overflow sensor 51 is installed in the molten metal inlet 53 to detect the molten metal that has flown out from the molten metal in the event that the molten metal overflows from the molten metal receiving pipe 49 due to some trouble. The hot water receiving chamber 55 is formed into a box shape with a size similar to that of the hot water supply chamber 3, and communicates with the side wall of the queen holding hot water supply chamber 40 with the bottom surface of the holding hot water supply chamber 40 at a common level, and is connected to the temperature measuring tube from the melting zone. 28, Temperature gutter 5
0. Molten metal (molten metal) moving through the receiving pipe 49
42 is held together with the holding hot water supply chamber 40.
The holding hot water supply chamber 40 is formed in a substantially sealed box shape, and the ratio of molten metal holding volume between the holding hot water supply chamber 40 and the hot water receiving chamber 55 in this embodiment is approximately 5:1. A cleaning opening (also serves as an inspection port) in the holding hot water supply chamber 40 located above the level of the upper surface of the molten metal when the molten metal 42 is held at maximum, on the side wall of the holding hot water supply chamber 40 located in a direction perpendicular to the temperature measuring gutter 50
56 is formed, and a lid for covering and sealing the cleaning opening 56 from the outside is provided.

At the front of the upper part of the holding hot water supply chamber 40, there is provided a resistance type holding hot water heating chamber heating element 41 such as a panel heater made of rod-shaped silicon carbide or nichrome wire. It is connected.

The holding hot water supply chamber 40 is provided with a holding hot water supply chamber molten metal temperature measuring body 57 whose detection end is disposed at the bottom middle layer of the molten metal 42 and penetrates through the partially inclined upper wall at a position diagonal to the hot water receiving chamber. It is being Further, the holding/molten metal supplying chamber 40 is provided with a holding/molten metal level sensor 52 that penetrates the upper wall thereof and has a detection end disposed near the upper surface of the molten metal 42 . The holding hot water supply room molten metal temperature measuring body 57 is connected to the holding hot water heating room temperature controller 65, and the holding hot water heating room molten metal level sensor 52 is directly connected to the holding hot water heating room central control device (programmable controller or sequencer) 66. It is connected. The holding chamber molten metal temperature measuring body 57 detects the temperature of the molten metal 42 . The holding hot water supply chamber temperature controller 65 controls the temperature of the molten metal in the holding hot water supply zone by comparing the detected temperature with a set temperature and controlling the amount of heat supplied to the holding hot water supply chamber heating element 41 (for example, PID control). conduct.

At the upper part of the holding hot water supply chamber 40, there are provided a holding hot water supply chamber pressurizing port 67 for introducing gas to pressurize the holding hot water supply zone, and a holding hot water supply chamber exhaust port 69 for discharging the gas and releasing the pressure. There is. The holding hot water supply chamber pressurizing port 67 is connected to the pressurizing source 19 through piping provided on the outside and a holding hot water supply chamber pressurizing valve 59 interposed therebetween. (The pressurization source 19 is shared by the melting zone and the holding hot water supply zone) The holding hot water supply chamber pressurizing valve 59 is an electromagnetic valve or the like that opens and closes based on a predetermined control signal of a holding hot water supply chamber pressurization control device 64, which will be described later. Further, the holding hot water supply chamber exhaust port 69 is externally connected to the holding hot water supply chamber exhaust valve 48 by piping, and is opened to the atmosphere.

The holding hot water supply chamber exhaust valve 48 is a solenoid valve or the like that opens and closes based on a predetermined control signal from the holding hot water supply chamber pressurization control device 64.

A holding hot water supply chamber pressure measurement port 68 is provided at the upper part of the holding hot water supply chamber 40 for measuring the pressure within the holding hot water supply zone. This holding hot water supply chamber pressure measurement date 68 is externally connected to a holding hot water supply chamber differential pressure transmitter 61 via piping. This holding hot water supply chamber differential pressure transmitter 61 has two measuring chambers 61.
one measurement chamber 61a is directly connected to the above-mentioned piping, and the other measurement chamber 61b is connected to the above-mentioned piping with a solenoid valve 60 interposed in the middle.
The difference in pressure applied to 1a and 61b is detected. The holding hot water supply chamber differential pressure transmitter 61 is connected to a holding hot water supply chamber differential pressure regulator 62, and the two constitute a holding hot water supply chamber differential pressure detection section. Further, the holding hot water supply chamber pressure measuring port 68 is connected to a holding hot water supply chamber pressure regulator 63. and the holding ml chamber differential pressure regulator 62 and the holding hot water supply chamber pressure regulator 63.
, the holding hot water supply chamber pressurizing valve 59, the holding hot water supply chamber exhaust valve 48, and the solenoid valve 60 are each connected to a holding hot water supply chamber pressurizing control device 64 so as to perform predetermined control.

The holding hot water supply chamber pressurization control device 64, the holding hot water supply chamber temperature controller 65, and the holding hot water supply chamber molten metal level sensor 52 are each connected to the holding hot water supply chamber central control device 66, and play an important role in controlling the holding hot water supply zone. fulfill.

This holding hot water supply chamber central control device 66 sends a temperature measurement request to the above-mentioned melting chamber central control device 32, and adjusts and controls exchange of hot water supply request signals and the like with an external casting machine (not shown).

Further, the holding hot water supply chamber 40 is provided with a hot water supply pipe 43 made of a heat-resistant material such as ceramics. One end of the hot water supply pipe 43 is opened as a molten metal inlet 45 at the bottom middle layer of the holding hot water supply chamber 40, and the other end is opened as a molten metal outlet 46 on the partially inclined upper wall of the holding hot water supply chamber. The holding hot water supply chamber is opened near the molten metal temperature measuring body 57.

This molten metal outlet 46 is provided with a hot water supply sensor 44 configured of one of an electrode type, photoelectric type, sonic type, electromagnetic type, and the like. This hot water supply sensor 44 detects the passage of m km and transmits it to the holding hot water supply chamber pressurization control device 64. The molten metal outlet 46 is connected to a die casting machine plunger sleeve 70 and the like via a hot water supply material 47.

Next, the operation of the melting and holding hot water supply furnace having the above configuration will be explained.

First, a predetermined amount of metal ingot 1 for melting (in this example, 120 to 87 hours) is put into the inlet 7, placed on the melting deck 4, and the lid 8 is closed to seal it. Next, the melting chamber temperature controller 13 is set to a temperature at which the metal lump 1 melts, and the overheat alarm meter 14 is set to a temperature that will not cause overheating, and then the melting chamber temperature controller 15 starts heating.

As a result, the temperature gradually rises and the metal lump 1 is melted, flowing from the melting deck 4 into the hot water storage tank 5 and stored therein.

This molten metal is a metal reservoir! At i6, the hot water is gently moved from the hot water storage tank 5 to the hot water supply chamber 3, and the melting continues until a predetermined liquid level is reached. The melting temperature of the metal lump 1 and the temperature of the molten metal 6 are controlled by a melting chamber temperature control device 15, and the liquid level is also detected by a melting chamber molten metal level sensor 12, and is controlled to a level that does not cause over-melting. At this time, foreign matter generated from the molten metal lump l is separated from the molten metal and is generally stored in a suspended state on the surface of the molten metal.

Next, when the melting chamber central controller 32 receives a temperature measurement request signal for the molten metal 6 from the holding hot water supply chamber central controller 66, the melting chamber pressurization controller 20 is activated under the control of the melting chamber central controller @32. The dissolution chamber exhaust valve 21 is closed and the dissolution chamber pressurization valve 18 is opened. As a result, compressed air or a gas such as an inert gas flows into the hot water supply chamber 3 from the pressurization 919, and the internal pressure increases. Due to this increase in internal pressure, the molten metal that has been stabilized and held in the transfer chamber 3 flows into the temperature measuring tube 28 from the molten metal inlet 29, flows out from the molten metal outlet 30, and passes through the temperature measuring gutter 50 to the holding hot water supply zone. The hot water is transferred to the hot water receiving port 53 of the hot water receiving pipe 49.

At this time, the solenoid valve 25 is closed at the timing when the temperature sensor 31 detects molten metal. As a result, the molten metal outlet 30
The pressure inside the hot water supply chamber 3 at the moment when the molten metal flows out is set in the measurement chamber 24b of the melting chamber differential pressure transmitter 24.
Here, the melting chamber pressure control device (programmable controller or sequencer) 20 measures the internal pressure in the hot water supply chamber 3 at this point from the melting chamber pressure measurement port 22 via the melting chamber pressure regulator 27, and The melting and holding furnace melting zone is individually verified to determine whether it is within the specified safe limit pressure, and if it corresponds to the specified value, pressurization is continued. Also, if it is out of range,
Pressurization is stopped.

If the pressurization continues, the molten metal will naturally reach the thermometer tube 28.
The temperature continues to rise within the temperature gutter 50, and the supply to the temperature gutter 50 continues.

Thereafter, the pressure inside the hot water supply chamber 3 is determined by the temperature sensor 31.
By continuously measuring the pressure at the time of detection and the amount of pressure increase thereafter via a differential pressure detection unit consisting of a dissolution chamber differential pressure transmitter 24, a dissolution chamber differential pressure controller 26, etc., more quantitative and safe measurement can be achieved. The subsequent absolute increase is measured and verified individually for each melting and holding furnace melting zone in the same way as the safe limit pressure described above.
Then, based on the concentration transfer amount per unit time-pressure relationship graph created in advance as shown in FIG. For example, pressurization is interrupted by closing the melting chamber pressurizing valve 18.

Here, the detection position of the temperature sensor 31 becomes a fixed point in the transfer I, regardless of any changes in the shape of the hot water supply chamber 3 (changes including accumulation of scale on the hearth or adhesion to the sides), The amount of pressure increase set in the room differential pressure controller 26 is important as an absolute value control element for quantitative temperature measurement.

At this time, the molten metal naturally continues to overflow from the molten metal outlet 30 of the molten metal transfer pipe 28, and the pressure decreases by the amount equivalent to the decrease in the molten metal whose temperature is measured in the molten metal receiving pipe 49 of the holding hot water supply zone via the temperature gutter 50 (naturally). (The pressure increase due to the expansion of the gas due to the temperature increase must be taken into account.) Temperature measurement continues through the transfer tube 28 until overflow is no longer possible. However, there is no point in leaving it until it can no longer overflow in practical terms. This is because the flow rate of the molten metal that overflows as the pressure decreases as described above increases after a while after the pressurization stops.
The flow rate decreases rapidly and becomes unacceptable for temperature measurement.

Therefore, as shown in FIG. 5, after adding a predetermined overflow pressure (-PI) to the overflow start pressure indicated by the dashed line, the melting chamber pressure control device 20 adjusts the hysteresis of the melting chamber differential pressure controller 26. (Adjustment operation gap) is effectively used as on-off control repeatedly to ensure a temperature measurement speed of molten metal that is acceptable for temperature measurement operation.

In this way, pressure is repeatedly applied as shown in Figure 5 by taking advantage of the difference in pressure level between on and off of the dissolution chamber differential pressure controller 26, making quantitative temperature measurement effective. It will be done. Then, the melting chamber exhaust valve 21 is activated by a stop command from the holding furnace central control device 66, by an internal timer of the melting furnace pressurization control device 20, or manually.
is opened, the pressure decreases, and temperature measurement is stopped.

In this case, since the molten metal inlet 23 is located in the middle layer on the bottom side of the hot water supply chamber 3, the molten metal whose temperature is measured contains impurities such as oxides floating on the surface or deposited at the bottom of the furnace. The temperature will be measured in the cleanest area, without any foreign matter derived from the environment being mixed in.

After that, in the melting zone, the metal lump 1 is charged from the input port 7 according to the operation plan, and melting is continued.

The molten metal transferred from the melting zone flows out from the molten metal outlet 54 to the molten metal receiving chamber 55 via the molten metal receiving pipe 49, moves to the molten metal holding chamber 40, and is held.

When the holding hot water supply room molten metal level sensor 52 detects the molten metal (molten metal) 42 that has become cloudy, the holding hot water supply room central control device 66 immediately sends a temperature measurement request to the melting chamber central control device 32. Command to stop.

Prior to measuring the temperature of the molten metal 42, the holding hot water supply room temperature controller 65 is set in advance to the holding temperature of the molten metal, and the molten metal 42 whose temperature has been measured is heated and kept warm by the holding hot water supply chamber heating element 41.

Subsequently, when the holding hot water supply chamber central control device 66 receives a hot water supply request signal from a casting machine (not shown), the holding hot water supply chamber pressurizing control device 64 is controlled by the holding hot water supply chamber central control unit 66 . closes the holding hot water chamber exhaust valve 48 and opens the holding hot water chamber pressurizing valve 59. As a result, compressed air or a gas such as an inert gas flows into the holding hot water supply chamber 40 from the pressurizing source 19, and the internal pressure increases. Due to this increase in internal pressure, the molten metal that has been stabilized and held in the holding and hot water supply chamber 40 flows into the hot water supply pipe 43 from the molten metal inlet 46, flows out from the molten metal outlet 46, and passes through the hot water supply amount 47 to the die casting machine plunger. The hot water is supplied to the receiving port of the casting machine such as the sleeve 70.

At this time, the solenoid valve 60 is closed at the timing when the hot water sensor 44 detects molten metal. As a result, the molten metal outlet 46
The pressure inside the holding hot water supply chamber 40 at the moment when the molten metal flows out is set in the measurement chamber 61b of the holding hot water supply chamber differential pressure transmitter 61.

Here, the holding hot water chamber pressurization control device (programmable controller or sequencer) 64 measures the internal pressure in the holding hot water chamber 40 at this point through the holding hot water chamber pressure measurement port 68 via the holding hot water chamber pressure regulator 63. However, each holding hot water supply zone in the melting holding hot water supply furnace is individually verified in advance to determine whether the pressure is within the prescribed safe limit pressure, and if the pressure corresponds to the prescribed value, pressurization is continued.

Moreover, if it is outside the range, pressurization is stopped. If the pressurization continues, the molten metal naturally continues to rise in the hot water supply pipe 43 and continues to be supplied to the casting machine such as the die casting machine plunger three 170 via the hot water supply amount 47.

Thereafter, the pressure in the holding hot water supply chamber 40 is continuously maintained at the pressure at the time of detection by the hot water supply sensor 44 and the amount of pressure increase thereafter. By measuring through the differential pressure detection unit, the subsequent absolute increase can be measured more quantitatively and safely, and similarly to the above-mentioned safe limit pressure, each melting and holding furnace holding hot water supply zone can be verified individually. Salary per unit hour mf created as shown in Figure 7! Based on the l-pressure relationship graph, the holding hot water chamber pressurization control device 64 maintains pressurization and closes the hot water chamber pressurizing valve 59 when the pressure increase amount set in the holding hot water chamber differential pressure controller 62 is reached. It will be canceled due to

In this case, let's compare and consider the temperature measurement amount per unit time-pressure relationship graph in FIG. 6 and the hot water supply amount per unit time-pressure relationship graph in FIG.

In the case of temperature measurement, it only needs to be done quantitatively, and as mentioned above, the key is to repeat a constant temperature measurement state using the hysteresis of the differential pressure controller. It is necessary to carry out a limited prescribed amount in a short period of time, and to reproduce it repeatedly with high accuracy. Therefore, in temperature measurement, the graph of temperature measurement amount per unit time - pressure relationship in Figure 6 can be said to be a guide, but in hot water supply, the relationship graph of hot water supply amount per unit time - pressure relationship in Figure 7 is insufficient to guarantee accuracy. This is an important guideline, and the scope of the provisions will naturally be narrowed.

The detection position of the hot water supply sensor 44 is the same as that of the temperature sensor 31, regardless of any changes in the shape of the holding hot water supply chamber 40 (changes including accumulation of scale on the hearth or adhesion to the sides). The amount of pressure increase set in the holding hot water supply room differential pressure controller 62 becomes an important absolute value control element in quantitatively supplying hot water.

That is, if we consider the relationship between the hot water supply pipe 43 and the holding hot water supply chamber 40 from a hydrodynamic viewpoint, the melt inlet 45 of the hot water supply pipe plays the role of a "moguri reel chair" immersed in the liquid. The passing flow rate is expressed by the following formula.

Q= CA (2g H)05 [m31SeC
Here, C: flow coefficient A niorifice cross-sectional area [m2] g: gravitational acceleration [m/5ec2H: water head difference [m] With the detection position of the water supply sensor 44 as a reference point (fixed point), the hot water supply sensor 44 If we consider the amount of pressure increase after detection as a water head difference, then after detection by the hot water supply sensor 44, the pressure will decrease by the amount equivalent to the decrease in the molten metal supplied to the outside.Of course, the pressure will increase due to the expansion of gas due to temperature rise. must be taken into account. ), it can be understood that for a certain period of time (fixed water supply time element) until quantitative hot water supply cannot be guaranteed, this pressure increase amount acts as an absolute hot water supply amount control element. This hot water supply fixed amount time element has been verified in advance.
Approximately 0.5 seconds to 1
It is known from our experience that the time limit is 5 seconds.

For example, if 2 is 87 seconds, it is approximately 5 seconds.

Therefore, after the pressurization of the holding hot water supply chamber is stopped due to the closing of the holding hot water supply chamber pressurizing valve 59 as described above, the hot water supply fixed amount time element set in the internal timer in the holding hot water supply chamber pressurization control device 64 is set. has elapsed, the holding hot water supply chamber exhaust valve 48
, the pressure in the holding hot water supply chamber 40 is released, the hot water supply is completed, and the holding hot water supply zone enters a standby state for a Pi hot water command from the casting machine.

In this case, as in the case of temperature measurement, the molten metal inlet 45 is arranged in the middle layer on the bottom side of the holding hot water supply chamber 40, so that the molten metal being supplied contains oxides floating on the surface or deposited at the bottom of the furnace. Impurities such as, foreign substances derived from furnace materials, etc. are not mixed in at all, and the cleanest part is leaked out.

In addition, in the above embodiment, the melting zone and the holding hot water supply zone may be arranged at the same level with respect to the floor surface on which they are installed, and these two zones may be formed as an integral structure. , they may be formed separately and installed in close contact.

In addition, the temperature measuring tube has a molten metal inlet in the middle layer on the bottom side which is sufficiently lower than the molten metal level in the hot water supply chamber, and a temperature measuring tube 50 is provided at a position higher than the hot water receiving port 53 of the hot water receiving pipe 49 in the holding hot water supply zone. It is sufficient if it is placed.

Further, the molten metal inlet of the molten metal receiving pipe 49 may be arranged in the middle layer on the bottom side which is sufficiently lower than the molten metal level in the molten metal receiving chamber, and the molten metal inlet may be arranged at a position sufficiently higher than the molten metal level.

The temperature measurement from the melting zone to the holding hot water supply zone can be performed whether or not hot water is being supplied to the casting machine in the holding hot water supply zone.

[Effects of the Invention] As explained above, according to the present invention, when a metal lump is introduced into the melting chamber through the inlet, the metal lump is melted safely and stably with high efficiency in terms of heat balance. The cleanest part of the molten metal that has settled down is automatically moved to the holding chamber and held, and the cleanest molten metal is safely, stably, and precisely quantified while still being clean. As a result, it has become possible to create a melting, holding, and melting furnace that can supply hot water to a casting machine.

By realizing the melting and holding hot water supply furnace according to the present invention, ingots are brought in from the entrance at one end of the factory, and assembled and packaged products are shipped from the exit at the other end.
It has become possible to form an ideal line in a single factory. In other words, in-line industrial furnaces have created possibilities by combining electric melting, electric heat retention, pneumatic temperature measurement, and pneumatic hot water supply.

[Brief explanation of the drawing]

1 and 2 are diagrams showing the structure of a melting and holding hot water supply furnace according to an embodiment of the present invention, and FIG.
1(b) is a sectional view taken along line BB of FIG. 2(a), and FIG. 1(c) is a sectional view taken along line C-C of FIG. 2(a).
Line sectional view, Figure 2 (a) is a plan view of the melting and holding furnace, Figure 2 (b) is a sectional view taken along line D-D of Figure 1 (b), and Figure 3 is the melting and holding furnace and water heater. Fig. 4 is a conventional example using a holding hot water supply furnace and a transporting ladle; Fig. 5 is an operating characteristic graph showing pressure changes in the melting zone during temperature measurement; Fig. 6 is a graph of the relationship between temperature measurement amount per unit time and pressure that is individually verified, and FIG. 7 is a graph of the relationship between the amount of hot water supplied per unit time and pressure that is individually verified. 1...Metal ingot, 2...Dissolution chamber, 3...Hot water supply room, 4.・・・・・・・・・・・・Dissolution deck, 5・・・・・・
......Storage tank, 6...Metal 8J (molten metal), 7.
・・・・・・・・・・・・Inlet, 8・・・・・・・・・Lid, 9・・・・・・・・・Dissolution chamber heating element, lO・・・
......Atmosphere temperature measuring element, 11...
...... Melting chamber molten metal temperature measuring element, 12...
...... Melting chamber molten metal level sensor, 13...
...... Melting chamber temperature controller, 14...
・・・・・・Overheating alarm meter, 15・・・・・・・・・・・・
- Melting chamber temperature control device, 16...
Melting chamber pressurizing port, 17...... Melting chamber exhaust port, 18...... Melting chamber pressurizing valve, 1
9...... Pressure source, 20...
...Dissolution chamber pressurization control device, 21...
・・・・・・Melting chamber exhaust valve, 22・・・・・・・・・・・・
- Melting chamber pressure measurement port, 24...... Melting chamber differential pressure transmitter, 25...... Solenoid valve, 26...・・・・・・Dissolution chamber differential pressure controller, 2
7・・・・・・・・・・・・Dissolution chamber pressure controller, 28・
・・・・・・・・・Thermometer tube, 29・・・・・・・・・
......Molten metal inlet, 30...Molten metal outlet, 31...Temperature sensor,
32・・・・・・・・・Dissolution chamber central control device, 4
0......Holding hot water supply room, 41...
......Holding hot water supply room heating element, 42...
・・・・・・Molten metal, 43・・・・・・・・・・・・
Hot water pipe, 44...Hot water sensor, 4
5...... Molten metal inlet, 46...
...... Molten metal outlet, 47...
...Hot water supply amount, 48......Holding hot water supply room exhaust valve, 49...Hot water receiving pipe, 50
・・・・・・・・・Temperature gutter, 51・・・・・・
...Overflow sensor 52...
...Holding hot water supply chamber molten metal level sensor, 53...
-...Made inlet, 54...Molten metal outlet, 55...Made inlet, 56
......Cleaning port, 57...
...Holding hot water supply chamber molten metal temperature measuring element, 58...
・・・・・・・・・Lid, 59・・・・・・・・・Holding hot water supply chamber pressurizing valve, 60
・・・・・・・・・・・・Solenoid valve, 61・・・・・・・
...Holding hot water supply room differential pressure transmitter, 61a, 61b...
・・・・・・・・・Measurement room, 62・・・・・・・・・
...Holding hot water supply room differential pressure controller, 63...
・・・Holding hot water supply chamber pressure controller, 64・・・・・・・・・
...Holding hot water supply room pressurization control device, 65...
...Holding hot water supply room temperature controller, 66...
...Holding hot water supply room central control device, 67...
...Holding hot water supply chamber pressurizing port, 68...
...Holding hot water supply chamber pressure measurement port, 69...
・・・Holding hot water supply room exhaust port, 70・・・・・・・・・・・・
・Die-casting machine plunger sleeve, 71... Melting and holding furnace 72...
...... Combustion machine 73 ...... Melting deck 74 ...
......Dissolution tank 75...Storage tank 76...Weir 77... ...Water heater 78...Lid 79...Ladle 80...Holding furnace 81.・・・・・・・・・・・・Mold inlet 82・・・・・・・・・Molten metal 83・・・・・・・・・Hot water supply pipe 84・・・・・・・・・...Hot water gutter ΔP1... Overflow pressure, ΔP2
・・・・・・・・・Hysteresis pressure. Patent applicant: Tanabe Kogyo Co., Ltd. Drawing jD1'j (no change in content) Figure 2 (a) Figure 2 (b) IcoL Procedure amendment writing method) % formula % 1, Indication of the incident 1986 Patent Application No. 216303 2, Title of the invention: Melting and holding supply, Hot water furnace 3, Relationship with the MI correction case Patent applicant (shipment date) Bill! January 26, 1988 5, Figure 2 of the drawing to be amended 6, Contents of the amendment Procedural amendment (method) December 23, 1986 t, Incident information frflft + G1 乍q: 7.
2.4 Jl Yam 1986 Patent Application No. 21630
3 No. 2, Name of the invention Melting and Holding Hot Water Furnace 3, Relationship with the case of the person making the amendment Patent applicant (Shipping date) November 11, 1927 5, ``2, Patent of the specification subject to the amendment The following content in the description will be amended in the column ``Scope of Claims'', the column ``3. Detailed Description of the Invention'', and the column 6 in ``4. Brief Description of the Drawings''. ■ Amend "2. Scope of Claims" as shown in the attached sheet. ■ On page 5, line 15, "stored in a hot water tank" is corrected to "stored in a hot water tank." ■ In the 9th line of page 6, the phrase ``The dissolution chamber has an exhaust port'' has been corrected to ``The dissolution chamber has an exhaust port.'' ■ In the 4th line of page 7, the statement ``Has a holding hot water supply chamber exhaust port'' has been corrected to ``Has a holding hot water supply chamber exhaust port.'' (2) On page 23, line 13, "molten metal inlet 23" is corrected to "molten metal inlet 29." ■ Page 32, line 17 “5・・・・・・・・・・・・
"Storage tank," is corrected to "6... Hot water storage tank." ■ Page 34, line 6 “42・・・・・・・・・・・・
``Molten metal'' is replaced with ``42...
・Molten metal (molten metal),” is corrected. ■ On page 33, lines 15 to 16, “24
...... Melting chamber differential pressure transmitter, 25...
......Solenoid valve," should be replaced with "24...... Melting chamber differential pressure transmitter, 2.
4a, 24b...Measurement room, 25.
・・・・・・・・・・・・Solenoid valve,'' is corrected. 2. Claims A melting deck 4 in the melting zone for holding the metal lump 1 and receiving the amount of heat necessary for melting the metal lump 1, and a melting deck 4 for holding the metal lump 1 and receiving the amount of heat necessary for melting the metal lump 1; ) 6, a melting chamber molten metal level sensor 12 that detects the amount of stored molten metal, and a metal lump 1 on the melting deck 4.
a melting chamber heating element 9 that supplies a predetermined amount of heat necessary for melting, temperature measuring elements 10 and 11 for measuring the temperature of the molten metal and the temperature of the atmosphere, respectively, and an external melting chamber pressurization control device 11.
20, and a melting chamber outlet 1017 for discharging the pressure in the melting zone according to the signal of the melting chamber pressurization control device 20, and communicated with the hot water storage tank 5. a hot water supply chamber 3; a thermometer tube 2 having a temperature sensor 31 in which a molten metal inlet 29 is located in the hot water supply chamber 3 and detects the pressure overflowing to an external molten metal outlet 30;
The temperature of the overflowing molten metal is measured by pressurizing the melting zone with compressed gas and a melting chamber differential pressure control unit that measures the pressure based on the signal from the temperature sensor 31. The molten metal receiving pipe 49 has a molten metal receiving port 53 located in contact with the temperature gutter 50 for receiving molten metal through the molten metal receiving chamber 50, and a molten metal outlet 54 located in the molten metal receiving chamber 55. Metal received in hot water receiving room 55? iJ hot water (
A holding chamber molten metal level sensor 52 that communicates with a receiving chamber 55 and has a holding chamber 40 for holding the molten metal (molten metal) 42, and detects the amount of molten metal held in the holding chamber 40.
, a holding hot water supply chamber heating element 41 that supplies a predetermined amount of heat necessary for keeping the molten metal in the holding hot water supply chamber 4θ warm, a temperature measuring element 57 for measuring the temperature of the molten metal, and an external holding hot water supply chamber pressurizing Holding hot water supply chamber pressurizing port 67 whose opening and closing are controlled by the control device 64
It also has a holding hot water supply chamber exhaust port 69 for discharging the pressure in the holding hot water supply zone to the outside according to a signal from the holding hot water supply chamber pressurization control device 64, and a molten metal inlet 45 in the holding hot water supply chamber 40. A holding pipe 43 is located at a molten metal outlet 46 outside the furnace and has a hot water supply sensor 44 that detects the start pressure of hot water supply, and a holding hot water supply chamber differential pressure control unit that measures the pressure based on the signal of the hot water supply sensor 44. A melting and holding hot water supply furnace characterized by comprising a hot water supply zone.

Claims (1)

[Claims] A melting deck 4 in a melting zone that has a melting chamber input port 7 for the metal lump 1, holds the metal lump 1 and receives the amount of heat necessary for melting, and a hot water storage for storing the molten metal (molten metal) 6. a tank 5, a melting chamber molten metal level sensor 12 that detects the amount of stored molten metal, and a metal lump 1 on the melting deck 4.
a melting chamber heating element 9 that supplies a predetermined amount of heat necessary for melting, temperature measuring elements 10 and 11 for measuring the temperature of the molten metal and the temperature of the atmosphere, respectively, and an external melting chamber pressurization control device 20.
It has a melting chamber pressurizing port 16 whose opening and closing are controlled by a signal from the melting chamber pressurizing port 16 and a melting chamber outlet 17 which discharges the pressure in the melting zone by a signal from the melting chamber pressurizing control device 20. A molten metal transfer chamber 3 that communicates with the molten metal, a molten metal inlet 29 located in the molten metal transfer chamber 3, and a molten metal transfer pipe 28 having a molten metal transfer sensor 31 that detects the pressure of overflowing to an external molten metal outlet 30, By pressurizing the melting zone with a melting chamber differential pressure control unit that measures the pressure based on the signal from the sensor 31 and compressed gas, the overflowing molten metal is transferred via the trough 50. The molten metal receiving pipe 49 has a molten metal receiving port 53 located in contact with the transfer trough 50 for receiving molten metal, and a molten metal outlet 54 located in the molten metal receiving chamber 55.
Molten metal (molten metal) 42 received into the receiving chamber 55 via
The holding hot water supply chamber 40 communicates with the hot water receiving chamber 55 and holds the hot water.
a holding hot water supply chamber molten metal level sensor 52 for detecting the amount of molten metal held in the holding hot water supply chamber 40; and a holding hot water supply chamber 52 for supplying a predetermined amount of heat necessary for keeping the molten metal in the holding hot water supply chamber 40 warm. A chamber heating element 41, a temperature measuring element 57 for measuring the temperature of molten metal, and an external holding hot water supply chamber pressurization control device 64
A holding hot water supply chamber pressurizing port 67 whose opening and closing are controlled by a holding hot water supply chamber pressurizing port 67 and a holding hot water supply chamber exhaust port 6 for discharging the pressure in the holding hot water supply zone to the outside by a signal from this holding hot water supply chamber pressurizing control device 64.
9, a molten metal inlet 45 is located in the holding hot water supply chamber 40, and a molten metal outlet 46 outside the furnace has a hot water supply sensor 44 for detecting the start pressure of hot water supply;
What is claimed is: 1. A melting and holding hot water supply furnace comprising: a holding hot water supply zone comprising a holding hot water supply chamber differential pressure control section which measures pressure using the signal No. 4;