JPS6147628B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressurized pouring device for casting that applies a predetermined gas pressure to molten metal, that is, molten metal, stored in a furnace body and pours the metal into a mold. The present invention seeks to provide a pressurized molten metal pouring device equipped with a residual molten metal amount detection and display device in a furnace body.

Figure 1 is a sectional view showing a conventional pressurized pouring device of this type, in which 1 is a furnace body 2 lined with refractory material.
The molten metal stored therein, that is, the molten metal, 3 is a tap port that communicates with the bottom of the furnace body 2 in a siphon shape, 4 is a metal receiving port that also communicates with the bottom of the furnace body 2 in a siphon shape. The upper end surface of the siphon-shaped communication port, 5 is a molten metal level detection sensor for detecting the molten metal level in the tap hole 3, and 6 is an airtight sensor for sealing the upper opening in the furnace body 2 through a gasket (not shown). The furnace lid 7 that closes the furnace body 2 passes through the furnace lid 6.
A pressurized gas pipe 3a, which communicates with the inside and whose outer end is connected to a pressurized gas source 9 via a pressurized gas control device 8, is provided at the upper flat part of the tap 3, and is connected to a stopper (not shown). ) is a pouring nozzle that can be opened and closed freely.

Since the conventional pressurized pouring device is configured as described above, when the mold to be poured (not shown) is conveyed to a predetermined position directly below the pouring nozzle 3a, the pressurized gas control device 8 is activated, pressurized gas source 9
By introducing pressurized gas at a predetermined pressure into the furnace body 2 through the pressurized gas pipe 7, the molten metal 1 in the furnace body 2 is pushed up to the upper part of the tap outlet 3 by this pressurized gas. Molten metal is poured into the mold from the pouring nozzle 3a. In addition, in order to set the pouring speed from the pouring nozzle 3a to a specified speed during this pouring process, the height of the molten metal 1 is always constant, so that the molten metal surface with which the molten metal comes into contact is adjusted. It goes without saying that the pressurized gas control device 8 is controlled by the detection sensor 5. When the mold is full, the pressurized gas supplied to the furnace body 2 is removed, and the height of the molten metal level at the outlet 3 is lowered, or the stopper (not shown) is closed to stop pouring into the mold. When the furnace stops and the amount of molten metal 1 in the furnace body 2 falls below a predetermined amount, hot water is supplied into the furnace body 2 from a ladle or the like through a molten metal inlet 4.

By the way, generally speaking, according to this type of pressurized pouring method,
As the pouring work progresses, the molten metal 1 in the furnace body 2 decreases and the height of the molten metal falls, and the height difference (h) between the height of the molten metal at the tap 3 and the height of the molten metal inside the furnace body 2 increases. When the molten metal 1 increases in size and is pressurized until the height of the molten metal in the furnace body 2 becomes lower than the upper end surface 17 of the siphon-like communication port, the molten metal 1 suddenly ejects from the tap 3 and the molten metal receiving port 4. It may cause an unexpected accident. In order to avoid this danger, the height of the molten metal inside the furnace body 2 must never be lower than the upper end surface 17 of the siphon-shaped communication port; Molten metal must be replenished at a certain high position. In order to know the timing of this molten metal replenishment, that is, the predetermined height of the molten metal 1 in the furnace body 2, it has been necessary to count in advance the number of molds to be poured, that is, the amount of molten metal poured into the furnace body 2. Either compare the initial amount of hot water stored in the furnace body 2, or remove the pressurized gas in the furnace body 2,
The height of the level of the molten metal 1 in the outlet 3 or inlet 4 had to be determined by visual observation or other means. This is a problem when automatically operating this type of pressurized pouring equipment, and when comparing the pouring amount and the initial stored hot water amount, it is important to note that the volume of the furnace body 2 is due to wear of the refractory lining and "slag" (slag). ), so estimating the height of the molten metal by weighing the amount of molten metal was extremely uncertain and could be dangerous.

This invention was made in order to eliminate the above-mentioned drawbacks of conventional heating furnaces. In other words, tap water outlet 3
The height of the hot water level in the furnace body 2 is always maintained at a predetermined height by the hot water level detection sensor 5.
The pressure of the pressurized gas inward is balanced with the weight of the molten metal itself, which corresponds to the height difference (h) between the height of the molten metal 1 level in the furnace body 2 and the height of the controlled molten metal level at the outlet 3. By paying attention to the fact that the melt level of the molten metal 1 in the furnace is at a certain level higher than the upper end surface of the siphon-shaped flow port, a pressure switch 13 is installed in the pressure gas pipe 7 to detect the pressure in the furnace. Pressurized gas is supplied into the furnace from the pressurized gas pipe 7 to perform tap casting, and even if the molten metal level in the furnace falls, when it reaches a certain level higher than the upper end surface 17 of the communication port, the pressure switch 13 is activated. This causes an alarm, and the gas inside the furnace flows out from the tap outlet.
The structure was designed to prevent accidents such as water erupting.

FIG. 2 shows an embodiment of the present invention, and since the same reference numerals and components are the same as those of the conventional device (FIG. 1) described above, the explanation thereof will be omitted.

12 is a pressure gauge connected to the pressure gauge connection port 10 of the pressurized gas pipe 7 via a conduit 11, and 13 is a plurality of pressure switches installed at predetermined positions on the pressurized gas pipe 7 at predetermined intervals. , 14 are a plurality of display/alarm devices connected to each pressure switch 13 via a connection line 15;
is composed of, for example, an indicator light and a buzzer.

Since the pressurized pouring device of the present invention is configured as described above, the pouring nozzle 3a of the tap 3
The height of the molten metal level in the furnace body 2 can be determined by visually observing the pressure gauge 12 while pouring the molten metal into the mold. In other words, taking cast iron as an example, 140m/m
Since the height of cast iron corresponds to a pressure of approximately 0.1 bar, the scale of the pressure gauge 12 is used to convert the pressure to the height of the molten metal.
If formed in m/m scale, the molten metal 1 in the furnace body 2
How many m/m is the hot water level from the tip of the hot water level detection sensor 5?
This allows you to determine whether it is below the surface.

According to this invention, the pressure gauge 12 operates based on pressure changes, completely independent of volume changes inside the furnace body.
Since the molten metal level can be detected by the pressure switch 13, each pressure switch 13 is operated to detect not only the bottom level of the molten metal 1 in the furnace body 2, but also the highest molten metal level that can be received. The display alarm device 14 can issue a display alarm. Also,
According to the present invention, assuming that the volume within the furnace body 2 is as per the design drawing, it is extremely convenient for metallurgical component adjustment if the approximate amount of remaining hot metal is written on the scale of the pressure gauge 12. Furthermore, since the pressure gauge 12 and the display/warning device 14 can be freely installed in the position that is most easily visible to the operator, it is not only possible to easily and accurately know the amount of molten metal 1 remaining in the furnace body 2. The device itself is extremely easy to inspect and maintain, and has excellent effects with high reliability.

In the above-mentioned embodiment, a predetermined gas pressure is applied to the molten metal 1 in the furnace body 2 and the molten metal is poured into the mold. Also in the apparatus, when a system is used that uses the hot water level detection sensor 5 to control the hot water level at the outlet 3,
It goes without saying that similar effects can be obtained by monitoring the current flowing through the coil of the electromagnetic pump.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing a conventional pressurized pouring device.
FIG. 2 is a sectional view showing an embodiment of the present invention. In the drawing, 1 is a molten metal, 2 is a furnace body, 7 is a pressurized gas pipe, 8 is a pressurized gas pressure control device, 9 is a pressurized gas source, 12 is a pressure gauge, 13 is a pressure switch, and 14 is a display/alarm device. It is. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. Pressurized gas at a predetermined pressure is supplied to the molten metal stored in the furnace body to raise the level of the molten metal to a tap hole formed in the upper part of the furnace body. A pressurized pouring device characterized by connecting a meter and a pressure switch that activates a display/alarm device. 2. The pressurized pouring device according to claim 1, characterized in that a plurality of pressure switches each connected to a display/alarm device are connected to a pressurized gas pipe.