JPH06134562A - Method for supplying molten metal into triangular ladle - Google Patents

Abstract

PURPOSE:To automate the supplying of molten steel into a triangular ladle and reduce the variation to the aimed level of molten metal surface height, at the time of supplying the molten metal into the triangular ladle up to an objective level by tilting a stationary ladle. CONSTITUTION:While the molten metal surface level has no influence on the molten metal supplying quantity till detecting the molten metal surface at the low level position set in the triangular ladle 1 with a first detector 4, the stationary ladle 2 is tilted at high speed. Thereafter, the stationary ladle 2 is tilted at low speed till detecting the molten metal surface at the high level position set at the suitably lower position than the aimed level 6 with a second detector 5, and thereafter, the stationary ladle 2 is tilted back at high speed. In such a way, the molten metal surface level is precisely detected and controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for supplying molten metal to a triangular ladle for supplying the molten metal for one casting from a stationary ladle to a triangular ladle in a centrifugal casting facility or the like.

[0002]

2. Description of the Related Art In a centrifugal casting facility for producing cast iron pipes, as shown in FIG. 4, pouring is performed from a triangular ladle 11 through a chute and a pouring trough 10 to a mold for each casting. Then, the molten metal for one casting is supplied from the stationary ladle 12 to the triangular ladle 11 before the casting, and the stationary ladle 12 is distributed from the melting furnace to the hot water ladle 13. Such a pouring system is generally adopted.

In order to supply the molten metal from the stationary ladle 12 to the triangular ladle 11, the operator conventionally pours the molten metal by operating the tilting operation lever of the stationary ladle, and the pouring operation takes about 90 seconds. 1
It is fairly frequent.

[0004]

However, the triangular ladle 1
Since the pouring is performed manually while visually checking the height of the molten metal on the wall surface of 1, the variation in the molten metal height is likely to occur.
In particular, the level of the molten metal cannot be visually inspected accurately depending on how the scale is adhered to the wall surface of the triangular ladle 11. Therefore, it is inevitable that the height of the molten metal will vary, resulting in variation in the weight of the cast product. . At present, there is a problem that the level variation of the molten metal is about 25 mm, and the variation of the product weight is large.

Therefore, the present invention solves such a problem and provides a method for supplying molten metal to a triangular ladle which can automate the supply of molten metal to the triangular ladle and can reduce variations in the level of the molten metal with respect to a target level. The purpose is to provide.

[0006]

In order to achieve this object, according to the present invention, when the stationary ladle is tilted to supply the molten metal to the target level in the triangular ladle, the first detecting means forms the triangular ladle. The stationary ladle is tilted at a high speed until the level of the molten metal is detected at the low level position set in the pan, and then at the high level position that is set appropriately lower than the target level by the second detecting means. The stationary ladle is tilted at a low speed until the molten metal surface is detected, and then the stationary ladle is tilted at a high speed to return.

Further, in the present invention, instead of detecting the molten metal surface at a low level position, the molten metal which has begun to flow out from the stationary ladle that tilts at a high speed is detected by the third detecting means, and then the stationary molten metal is detected. Switch the tilting of the pan to low speed.

[0008]

[Operation] When the molten metal is supplied from the stationary ladle to the triangular ladle, the molten metal is supplied to a low level position in the triangular ladle or until the molten metal starts to flow out from the stationary ladle. While not affecting the amount, tilt the stationary ladle at high speed,
After that, by tilting at low speed until just before the target level, the molten metal level is detected and controlled with high accuracy, and after detection, high-speed recovery is performed, so that the molten metal supply with a small variation in molten metal height with respect to the target level is automatically And it is realized efficiently.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 1 is a triangular ladle, and the molten metal 3 is supplied from the stationary ladle 2 by tilting the stationary ladle 2 as shown by an imaginary line. A first detector 4 and a second detector 5, which are radiation thermometers, are provided diagonally above the triangular ladle 1. The first detector 4 detects the molten metal surface when the molten metal is supplied to the low level position set in the triangular ladle 1. The second
The detector 5 of 1 detects the molten metal surface when the molten metal is supplied to a high level position which is set appropriately lower than the target level 6 of the molten metal surface.

When the molten metal 3 is supplied to the triangular ladle 1, as shown in FIG. 2, first, the stationary ladle 2 is tilted at a high speed to quickly operate. As a result, the dead time is shortened as long as it does not affect the control of the molten metal supply amount. In this way, the stationary ladle 2 is tilted at high speed to start the supply of the molten metal, and when the molten metal 3 is supplied to the low level position set by the first detector 4, the detector 4 The bath surface is detected. Therefore, the tilting speed of the stationary ladle 2 is switched to a low speed, and the operation of gradually supplying the molten metal is changed. This makes it possible to accurately detect the molten metal level and control the supply amount. Then, the molten metal supply is continued at the low tilting speed. When the molten metal 3 is supplied to a high level position,
Since the molten metal level is detected by the second detector 5, the stationary ladle 2 is returned and tilted at high speed there. Then, the supply of molten metal from the stationary ladle 2 is quickly stopped, and the level of the molten metal almost matches the target level 6.

As described above, when the molten metal is supplied from the stationary ladle 2 to the triangular ladle 1, the stationary ladle 2 is tilted at a high speed until a low level position that does not affect the molten metal supply amount, and then the target level 6 is reached. It is possible to accurately and accurately detect the molten metal level by tilting it at a low speed until just before, and to automatically and efficiently realize the molten metal supply with a small variation in the molten metal height to the target level 6 by returning to the high speed after the detection. You can

[0012] As a concrete example, in the conventional molten metal supply by human operation, the variation of the molten metal surface height is about 25 mm, whereas according to the method of this embodiment, it takes about 90 seconds. It was possible to supply the molten metal within approximately the same time and to suppress variations in the height of the molten metal surface to about 15 mm.

In the above embodiment, when the molten metal 3 is supplied to the low level position in the triangular ladle 1, the molten metal surface is detected by the first detector 4 which is a radiation thermometer. The reason for using this radiation thermometer is that the pouring pitch is as short as 90 seconds, so the wall surface of the triangular ladle 1 before pouring is 90
This is because it glows red around 0 ° C. and the surface of the molten metal cannot be detected by using a photoelectric tube or the like.

FIG. 3 shows a modification in which a phototube can be used. As shown in the figure, when the molten metal 3 starts to flow out from the stationary ladle 2, the molten metal 3 is formed into a third photoelectric cell.
Alternatively, the tilting of the stationary ladle 2 may be switched to a low speed based on the detection by the detector 7.
Reference numeral 8 denotes a fourth detector, which is composed of a radiation thermometer and detects that the molten metal 3 has been supplied to a high level position, like the second detector 5.

[0015]

As described above, according to the present invention, when the molten metal is supplied from the stationary ladle to the triangular ladle, the molten metal is supplied to the low level position in the triangular ladle or from the stationary ladle. The level of the molten metal can be accurately detected by inclining the stationary ladle at high speed until it reaches the outflow, and then slowly inclining it until just before the target level.
By returning to the high speed after the detection, it is possible to automatically and efficiently realize the supply of the molten metal in which the variation of the height of the molten metal with respect to the target level is small.

[Brief description of drawings]

FIG. 1 is a diagram illustrating supply of molten metal to a triangular ladle according to an embodiment of the present invention.

FIG. 2 is a diagram showing a tilting speed of the stationary ladle according to the embodiment.

FIG. 3 is a diagram illustrating the supply of molten metal to a triangular ladle in another embodiment of the present invention.

FIG. 4 is a view showing a conventional pouring system.

[Explanation of symbols]

 1 Triangular ladle 2 Stationary ladle 3 Molten metal 4 First detector 5 Second detector 6 Target level

Claims (2)

[Claims] 1. When the stationary ladle is tilted to supply the molten metal to the target level in the triangular ladle, the first detection means detects the molten metal surface at a low level position set in the triangular ladle. Until that time, the stationary ladle is tilted at a high speed, and then the stationary ladle is tilted at a low speed until the level of the molten metal is detected by the second detection means at a high level position appropriately lower than the target level. A method for supplying molten metal to a triangular ladle, which comprises tilting the stationary ladle at a high speed afterwards. 2. When tilting the stationary ladle to supply the molten metal into the triangular ladle up to its target level, the stationary ladle is kept until the third detecting means detects the molten metal which has begun to flow out from the stationary ladle. The pan is tilted at a high speed, then the stationary ladle is tilted at a low speed until the level of the molten metal is detected by the fourth detecting means at a level position appropriately lower than the target level, and then the stationary ladle is moved. A method of supplying molten metal to a triangular ladle, which is characterized by tilting and returning at high speed.