JPS6360067A - Solid metal charging port for automatic metering device of molten metal - Google Patents

Abstract

PURPOSE:To enable some receiving and melting of a solid metal without interrupting a casting operation by providing a cap having a port for accepting the solid metal and mechanical press contact mechanism to the outside of a holding furnace and providing a charging port having a discharge port of the solid metal to the inside of the furnace. CONSTITUTION:The replenishment of some molten metal is executed by opening the cap 28 of the charging port 27 for the solid metal by using the mechanical press contact mechanism 29 in the off cycle time of a pouring operation when the inside of the holding furnace 2 is not pressurized if the need for replenishing the molten metal arises with a decrease in the amt. of the molten metal in the holding furnace 2. The solid meal is charged into the furnace by a solid metal charging device, etc., and some solid metal is melted with interrupting the casting operation. The cap 28 is immediately closed by using the mechanical press contact mechanism 29 when the charging of the solid metal ends. The inside of the holding furnace 2 is again hermetically closed and is in the state of waiting for the pouring request signal from the casting machine.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is for an automatic molten metal measuring device that pressurizes the inside of a heat retention furnace in which molten metal is stored, automatically measures the molten metal, and supplies hot water to the outside of the heat retention furnace. This relates to a solid metal inlet.

[Prior art and its problems] Conventionally, as an automatic metering device for quantitatively supplying molten metal, for example, as shown in Fig. A device equipped with a hot water supply pipe 3, a pressurization control unit 4 for supplying the molten metal 1 in the heat retention furnace 2, and a hot water supply sensor 6 for detecting the molten metal 1 at the clear outlet 5 of the hot water supply pipe 3. There is. Then, the molten metal flowing out from the hot water supply pipe 3 is supplied to the plunger three 18 and the like of the die-casting machine using the gutter 7.

However, although the above-mentioned automatic molten metal measuring device supplies normal molten metal from the lower part of the insulating furnace and is superior in terms of temperature, the amount of molten metal held in the insulating furnace that can be supplied is limited to the amount that can be supplied outside the furnace. If new molten metal is to be received after the melting process has been completed, the casting operation must be stopped, but the amount required for one shift in the casting process is only slightly insufficient, and if possible, the shortage should be made up by melting solid metal. Despite the fact that the insulating furnace has enough melting capacity to compensate for this shortage,
[Object of the Invention] The present invention has been made in view of the above circumstances, and solves the problem of having to suspend the casting operation in order to accept the solid metal. A solid metal inlet for an automatic molten metal measuring device that can accept and melt solid metal without causing a sudden change in molten metal temperature, even if there is a slight shortage of molten metal during l-shifts in the casting process. The purpose is to provide

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a heating element provided in a closed heat-retaining furnace for storing molten metal, and a temperature measuring element that measures the temperature of the molten metal. and a power regulator that controls the amount of heat generated by the heating element using a temperature controller based on this detection signal, and has a molten metal inlet in the molten metal of the heat retention furnace,
A sensor that detects the arrival of molten metal is installed at the outlet of a hot water supply pipe that has an outlet outside the furnace to supply the molten metal, and the gas introduced into the heat retention furnace is pressurized and controlled according to the signal from this sensor. It has a pressure control part, and is equipped with a cleaning port and molten metal receiving port for periodically discharging a small amount of slag generated in the furnace, and a lid for sealing the cleaning port and molten metal receiving port. In addition, a solid metal receiving port outside the furnace is used to replenish the molten metal automatic measuring device with the amount of molten metal that is slightly insufficient (for example, 10% to 15% of the storage amount in the holding furnace) during one shift of casting work. The furnace has a lid with a mechanical pressure welding mechanism (pneumatic cylinder, hydraulic cylinder, motor-driven cam, etc.) to seal this receiving port when solid metal is not received and to prevent the airtightness of the heat insulating furnace from being compromised. A solid metal input port with a solid metal discharge port is provided inside, and the solid metal can be melted in small amounts at regular intervals without interrupting the casting operation or causing sudden temperature changes. .

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

FIG. 3 shows an automatic molten metal meter fI according to an embodiment of the present invention.
It is a figure showing the structure of L device. In the figure, a heat retention furnace 2 having a hot water supply device is made of a furnace material lO having fire resistance and heat insulation properties, and is formed in a box shape as a tank for storing molten metal 1 inside.

There is a solid metal inlet 27 on the ceiling relatively to the side of the insulating furnace, and a mechanical device that seals the solid metal inlet 27 when not accepting solid metal so as not to impair the airtightness of the insulating furnace. It has a lid 28 having a pressure welding device 29 (the example shown is a pneumatic cylinder, other examples are not shown). Further, on one side of the heat retention furnace, there is a cleaning port and molten metal receiving port for periodically discharging some slag, etc., generated as the solid metal is melted from the solid metal input port 27. 1
2 and a lid 13 for sealing the cleaning port/molten metal receiving port 12. A resistance-type heating element (the illustrated is a rod-shaped silicon carbide heating element) 11 is provided in the upper part of the heat-retaining furnace 2 and is equipped with a rod-shaped silicon carbide or nichrome wire. Connected to power supply via. Further, the heat retention furnace 2 is provided with a molten metal temperature measuring body 21 whose detection end is disposed inside the molten metal 1 of the heat retention furnace 2 and extends diagonally through the horizontally tilted portion of the 12 cleaning ports. It is being The molten metal temperature measuring body 21 is
It is connected to the thyristor type power regulator via a temperature controller 20. That is, the molten metal temperature sensor 21 detects the temperature of the molten metal l, compares it with the temperature set by the temperature controller 20, and controls the thyristor-type power regulator 19 to control the temperature of the heating element 11 based on the comparison temperature. Control the amount of heat (e.g. PI
D control) to perform temperature control. A pressurizing port 35 for introducing gas to pressurize the inside of the heat-retaining furnace 2 and an exhaust port 36 for discharging the gas and releasing the pressure are provided in the upper part of the heat-retaining furnace. The pressurizing port 35 is piped externally, and is connected to the pressurizer [15] with a pressurizing valve 16 interposed therebetween. This pressurization R15 is, for example, a device capable of supplying pressurized gas such as air compressed by a compressor or inert gas filled in a cylinder. The pressure valve 16 is a solenoid valve or the like that opens and closes based on a predetermined control signal from a pressure control device 34, which will be described later. Further, the exhaust port 36 is connected to the exhaust valve 17 via piping on the outside and is opened to the atmosphere. Above exhaust valve 1
Reference numeral 7 denotes a solenoid valve or the like that opens and closes based on a predetermined control signal from a pressurization control device 34, which will be described later.

An in-furnace pressure measuring port 14 is provided at the upper part of the heat-retaining furnace 2 to measure its internal pressure. This in-furnace pressure measurement port 14 is externally connected to a differential pressure transmitter 31 and a pressure alarm meter 30 via piping. This differential pressure transmitter 31 has two measurement chambers 31a and 31b, one of which is the measurement chamber 31b.
1b is connected to the measurement port 14 with a solenoid valve 32 interposed in the middle of the piping, and the difference in pressure applied to the two measurement chambers 31a and 31b is detected. The differential pressure transmitter 31 is connected to a differential pressure regulator 33, and the two constitute a differential pressure detection section. Further, the furnace pressure measurement port 14 is connected to a pressure regulator 30. Then, the differential pressure regulator 33 and the pressure regulator 30, the pressurizing valve 16 and the exhaust valve 17
and solenoid valve 32 are each connected to a pressurization control device 34 so that predetermined control, which will be described later, can be performed. As mentioned above, the pressurization control section 4 includes the solenoid valve 32, the differential pressure transmitter 31,
Differential pressure regulator 33, pressure regulator 30, and pressurization control device 3
It consists of 4.

Further, the heat-retaining furnace 2 is provided with a hot water supply pipe 3 made of a heat-resistant material. One end of the hot water supply pipe 3 is opened as a molten metal flow port 9 at the bottom side of the heat retention furnace 2, and the other end is opened to the outside as a molten metal outlet 5. The molten metal outlet 5 is provided with a hot water supply sensor 6 configured of one of an electrode type, photoelectric type, sonic type, electromagnetic type, etc. (the electrode type is shown). The hot water sensor 6 detects the passage of molten metal and transmits the detection to the pressurization control device 34 . The molten metal outlet 5 is communicated via a gutter 7 to a side to be supplied such as a plunger of a die-casting machine.

Next, the operation of the automatic weighing device having the above configuration will be explained. First, the molten metal 1 up to the holding limit required for hot water supply is received from the cleaning port/molten metal receiving port 12, and then 1f13 is closed to seal the cleaning port/molten metal receiving port 12. Next, after setting the temperature controller 20 to a temperature necessary for keeping warm, the thyristor type power regulator 19 supplies power to the heating element 11 to control the temperature of the molten metal.

The pressurization control unit 4 can be activated by operating a key switch (not shown). In response to a hot water supply request signal from a casting machine (such as a die casting machine), the exhaust valve 17 is closed and the pressurizing valve 16 is opened under the control of the pressurizing control device 34. As a result, compressed air or gas such as inert gas flows into the heat retention furnace 2 from the pressurization source 15, and the internal pressure increases.

Due to this increase in internal pressure, the molten metal in the heat retention furnace 2 flows from the molten metal flow port 9 into the hot water supply pipe 3, flows out from the molten metal outlet 5, and is supplied to the die casting machine plunger sleeve or the like via the trough 7. At this time, the solenoid valve 32 is closed at the timing when the hot water supply sensor 6 detects molten metal. As a result, the pressure inside the heat retention furnace 2 at the moment when the molten metal flows out from the outlet 5 is set in the measurement chamber 31b in the differential pressure transmitter 31.

Here, the pressure control device 34 (programmable controller or sequencer) measures the pressure inside the holding furnace at this point from the furnace pressure measurement port 14 through the pressure regulator 30, and automatically controls the pressure of each molten metal in advance. Verify the metering device, and if it corresponds to the specified value, continue pressurizing. Moreover, if it is outside the range, pressurization is stopped.

If the pressurization continues, the molten metal naturally continues to rise inside the hot water supply pipe 3 and is supplied to the outside.

Thereafter, the pressure inside the heat-retaining furnace 2 is reduced to
The temperature and pressure transmitter 3 continuously monitors the pressure at the time of detection and the amount of pressure increase thereafter.
1 and a differential pressure regulator 33, etc., it is possible to more quantitatively and safely measure the absolute amount of pressure increase, and to automatically measure the molten metal at each point in the same manner as the safe limit pressure described above. The equipment should be individually verified and the third
Based on the graph of the supply/pressure relationship per unit time created as shown in the figure, the pressurization control device 34 starts pressurizing the pressurization valve 16 when the pressure increase amount set in the differential pressure regulator 33 is reached.
It will be canceled by closing.

Here, the detection position of the hot water supply sensor 6 becomes a fixed point during hot water supply, regardless of any changes in the shape of the holding furnace 2 (changes including accumulation of slag etc. on the hearth, or adhesion to the sides, etc.). The amount of pressure increase set in the differential pressure regulator 33 is important as an absolute value control element for quantitatively supplying hot water for a certain period of time.

In this way, if the hot water supply is continued based on the hot water supply request signal from the casting machine, the amount of molten metal in the heat insulating furnace 2 will eventually decrease and it will be necessary to replenish the molten metal. In order to replenish this small amount of i8 hot metal, a small amount of return material (runners, etc.) from which the product has been removed from the casting is melted in the heat retention furnace 2 using the surplus heat supply capacity that does not affect the temperature control of the molten metal. Here, the cover 28 of the solid metal inlet 27 of the present invention is connected using the mechanical pressure welding mechanism 29 during the off cycle of the hot water supply operation and the hot water supply operation (in one embodiment) when the inside of the heat retention furnace 2 is not pressurized. , the pressurization time in the heat insulating furnace 2 was 7 seconds, and the off cycle time was 25 seconds).
Inject using a solid metal injecting device (not shown), etc.
Some solid metal melting takes place without interrupting the casting operation. When charging of the solid metal is completed, the M2O is immediately closed using the mechanical pressure welding mechanism 29, and the inside of the heat-retaining furnace 2 is hermetically sealed again, waiting for a hot water supply request signal from the casting machine.

In case 2, if the casting is to be quickly separated into the product and the return material and fed into the solid metal receiving port 27, the solid metal should be fed into the solid metal receiving port 27 while being kept at a temperature of 150°C to 250°C. This makes it possible to expect extremely large thermal energy effects.

In addition, in the above embodiment, the solid metal inlet 2) 7 is
It is sufficient that the solid metal receiving port 37 is disposed above the upper casing of the heat insulating furnace 2, and the solid metal discharge port 38 is disposed above the top surface of the molten metal when the molten metal in the heat insulating furnace 2 is held at maximum.

Furthermore, as shown in FIG. 4, the solid metal input port 27 has a solid metal receiving port 37 disposed outside the wound casing of the heating furnace 2, and a solid metal discharge port 38 that penetrates the side wall of the heating furnace 2. It is only necessary that the upper surface of the molten metal be placed above the upper surface of the molten metal when the molten metal is held at maximum in the heat insulating furnace 2.

The present invention is not limited to an automatic molten metal measuring device, but also a pressurized distribution device, which is a device for distributing molten metal from a closed melting furnace to the outside of the melting furnace by pressurizing the inside of the melting furnace using gas. It can also be carried out in a melting furnace with a hot water device.

[Effects of the Invention] As explained above, according to the present invention, a sudden change in the temperature of the molten metal can be corrected without interrupting the casting operation, and a slight shortage of molten metal during the l-shift in the casting process can be corrected without interrupting the casting operation. It has become possible to provide a solid metal inlet for an automatic needle ffi device for molten metal without causing any problems.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the structure of an automatic molten metal measuring device according to an embodiment of the present invention provided with a solid metal inlet, FIG. 2 is a diagram showing the structure of a conventional automatic molten metal measuring device, FIG. 3 is a graph of the relationship between the amount of hot water supplied per unit time and the pressure that is individually verified. FIG. 4 is a diagram showing a structure according to an embodiment in which the solid metal inlet of the present invention is attached to the side of a heat retention furnace. l・・・・・・・・・
・・・・・・Molten metal (molten metal) 2・・・・・・・・・・・・
・Heating furnace 3・・・・・・・・・Hot water pipe 4・・・・・・・・・Pressure control part 5・・・・・・
......(Hot water supply pipe) Molten metal outlet 6...
...Hot water sensor 7...Gutter 8...Die casting machine plunger sleeve 9... (Hot water pipe) Molten metal inlet lO
......Heat-retention furnace furnace material 11...
・・・・・・Heating element 12・・・・・・・・・Cleaning port and molten metal receiving port 13・・・・・・・・・(Cleaning port and molten metal receiving port) Lid 14・・・・・・・・・Furnace pressure measurement port 1
5... Pressure source 16... Pressure valve 17... Exhaust valve 18... ......Electric wire 19...Thyristor type power regulator 20...Temperature controller 21...
......Molten metal temperature measuring element 27...
...Solid metal inlet 28...
(Solid metal inlet) Lid 29 (
Solid metal inlet port cover) I Mechanical pressure welding mechanism 30... Pressure regulator 31...
......Differential pressure transmitter 32...
... Solenoid valve 33 ...... Differential pressure controller 34 ...
...... Pressure control device (programmable controller or sequencer) 35 ...... Pressure port 36 ...... Exhaust port 37 ......Solid metal receiving port 38
......Solid metal outlet patent applicant
Tanabe Kogyo Co., Ltd. Figure 1 Figure 2! A Kg/Sec 12 Figure 4 Procedural amendment g (vaginal) 1985 lθ Month 1 Commissioner of the Patent Office Black 1) Akio Tono 1, Display of case Solid metal input port 3 for automatic measuring device for molten metal, amendment Relationship with the case of the person who filed the patent application Name: Tanabe Kogyo Co., Ltd. (Delivery date) Month, Day 5, 1920, Subject of amendment 6, Description of contents of amendment Correct the following contents. ■ In the second line of page 3, correct the phrase ``For example, Figure 1'' to ``For example, Figure 2.'' ■ On page 5, line 18, "Figure 3 is" is corrected to "Figure 1 is".

Claims (1)

[Claims] A closed heat-retaining furnace 2 that stores molten metal 1, a heating element 11 provided in the heat-retaining furnace 2, and a temperature measuring element 21 detecting the temperature of the molten metal 1, and a temperature controller 20 based on this detection signal. It has a power regulator 19 for controlling the calorific value of the heating element 11, a molten metal inlet 9 in the molten metal 2 of the heat retention furnace 2, and supplies molten metal having an outlet 5 outside the furnace. a hot water supply pipe 3, a sensor 6 for detecting the molten metal rising inside the hot water supply pipe 3 at a fixed point, and a pressurization control of the gas introduced into the heat retention furnace 2 according to the signal from the sensor 6. While the measuring device having the pressurization control unit 4 and the measuring device are performing metering for quantitatively supplying molten metal from the hot water supply pipe 3 to the outside of the heat retention furnace 2, it is possible to improve the metering accuracy without interrupting this metering operation. In order to continuously receive solid metal from outside the heat insulating furnace 2 without impairing its effectiveness, a solid metal receiving port is provided outside the furnace, and this receiving port is sealed when solid metal is not being received to prevent the airtightness of the heat insulating furnace from being compromised. a solid metal inlet 27 having a lid 28 with a mechanical pressure welding mechanism 29 (pneumatic cylinder, hydraulic cylinder, motor-driven cam, etc.) to prevent the solid metal from entering the furnace; A cleaning port/molten metal receiving port 12 for periodically discharging some slag, etc. generated as a result of melting of the solid metal received from the solid metal input port 27, and a cleaning port/molten metal receiving port 12. A solid metal inlet for an automatic measuring device for molten metal, characterized by comprising a lid 13 for sealing.