JPS5926888B2 - Method and device for detecting molten metal level in molten metal container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a molten metal surface detection method for injecting a predetermined amount of molten metal into a molten metal container.

For example, hot metal tapped from a blast furnace is divided and stored in a plurality of hot metal pots. At this time, if the amount stored in each hot metal ladle is less than the specified amount, the number of hot metal ladle used increases. Furthermore, if the stored amount is larger than the specified amount, there are problems such as overflowing during transfer, damaging the transfer equipment, or causing a serious accident. Therefore, each hot metal ladle is required to contain a specified amount of hot metal. However, the amount of hot metal per unit time when entering the hot metal ladle via the gutter varies due to various factors.
Also, while hot metal is being poured into the hot metal ladle, iron oxide, quiche carbon, etc. are generated, and these generated substances are collected by the dust collection port installed in the upper part of the hot metal ladle. Since the hot water level cannot be visually monitored, monitoring by workers is often uncertain, and there are problems in the work environment such as workers being exposed to high temperature and freezing air. Further, the above-mentioned monitoring can also be performed by using a monitoring device as shown in FIG.

Specifically, the electrode rod 1 is installed at a reference position in the hot metal ladle 2, and the electrode rod 1 is moved so that an electrical closed circuit is formed when the hot metal 3 rises and contacts the tip of the electrode rod 1. is grounded by a lead wire 4 via an alarm lamp 5 and a power source 6. In addition, the hot metal 3 is grounded through the gutter T, and when the rising hot metal 3 reaches the tip of the electrode rod 1, a closed circuit is formed, and it can be understood that a predetermined amount of hot metal has been stored in the hot metal ladle 2. . With such a monitoring device, there is a problem that if there is a malfunction or malfunction of the device, the hot metal will overflow from the pot, or it will not be possible to detect it until after it has overflowed. I was worried about using it. In addition, there was no other satisfactory monitoring device available. The present invention provides a method for detecting the level of molten metal in a molten metal container that enables reliable monitoring by improving the above-mentioned monitoring device and making the most of its advantages. The invention relates to a method for detecting a molten metal level in a molten metal container by forming an electrical closed circuit when the molten metal surface contacts an electrode disposed at a predetermined position. is used as one electrode, and an electrical closed circuit formed through an electrode disposed below the reference setting position is used as a signal to raise the electrode to open the circuit, which raises the electrode to the reference setting position. This is a method for detecting the molten metal level in a molten metal container, which is characterized in that the method is repeated until the electrode reaches the level.

The present invention utilizes the electrical closed circuit formed by the contact of the molten metal surface with the electrode as an electrical signal, and uses this closed circuit signal to operate a drive device that raises the electrode. By repeating the operation multiple times in which the electrode is separated from the molten metal surface, the closed circuit becomes an open circuit, and the electrode stops rising, the electrode is raised stepwise, and this stepwise rising electrode becomes the molten metal container. Until it reaches the optimal position set as the amount of molten metal to be stored, that is, the reference setting position,
Since the hot water level at each location is continuously measured, it can be confirmed that the hot water level detection device is operating normally.

Furthermore, since a detection device that has been confirmed to be operating normally as described above is used, it is possible to accurately detect that the hot water level has reached the reference setting position. By detecting the level of the molten metal, the injection of molten metal into the molten metal container is stopped and the container is replaced. However, the electrodes placed at predetermined positions below the reference setting position are raised in stages, and each Since the molten metal level at the position is detected, it is easy to detect a position of a specific dimension (for example, 50 mm) from the reference setting position, so preparation work for stopping pouring of molten metal into the container and container replacement work can be carried out easily. etc. can be carried out appropriately.

As described above, according to the present invention, the surface of the molten metal can be detected without being affected by dust generation during pouring of the molten metal, temperature of the molten metal, etc., and therefore serious accidents such as molten metal overflowing from the container can be prevented.

The present invention will be specifically explained below based on FIG. 2.

In the figure, 2 is a pot that stores hot metal 3.

This hot metal ladle 2 is placed on a cart 9 running on rails 8. When the hot metal is injected to the reference setting position A of the hot metal ladle 2, the injection is stopped, the cart 9 is moved, and the hot metal ladle 2 is replaced. The electrode rod 1 is suspended from one end of the holding arm 10 so that the electrode rod 1 can be placed inside the hot metal ladle 2.

As the electrode rod 1, a graphite material or metal (for example, steel material) can be used. The holding arm 10 suspends the electrode rod 1 and is pivotally supported by a support base 11 so as to be vertically movable so that the electrode rod 1 side naturally descends.

A wire 12 is connected to the other end of the holding arm 10.

This wire 12 is wound onto a drum 13 via a pulley 12. This drum 13 is rotated left and right by the drive of a motor 14. When the drum 13 is rotated in a direction to wind up the wire 12, one end of the holding arm 10 moves downward, and the electrode rod 1 rises using the support 11 as a fulcrum. Further, when the drum 13 is rotated in the direction in which the wire 12 is wound back, the electrode rod 1 side is lowered by its own weight. The support 11, pulley 12', drum 13, and motor 14 are placed on a truck 15, which can move on rails 16.

This movement of the truck 15 is effected by a signal from a limit switch 17. This limit switch 17 is operated by the movement of a member 18 supported by the tension of the wire 12. That is, the wire 12 is normally in a stretched state, but the electrode rod 1 is placed in the hot metal ladle 2, for example.
When the electrode rod 1 is lowered to a predetermined position, if the electrode rod 1 hits a deposit (such as slag) B in the hot metal ladle 2, the electrode rod 1 does not lower and the wire 12 becomes loose. The loosening of the wire 12 causes the member 18 to move downward and operate the limit switch 17. Then, the electrode rod 1 is raised, the cart 15 is moved forward by a certain amount, and the electrode rod 1 is lowered again to a predetermined position in the hot metal ladle 2 and installed. The electrode rod 1 is installed at, for example, 300 degrees below the reference setting position A.

The hanging support of the electrode rod 1 and other parts of the holding arm 10 are electrically insulated by an insulator 10', and the electrode rod 1, the holding arm 10, the relay 19, and the power source 20 are connected with a lead wire 21. One end of the lead wire 21 is grounded.

Therefore, the hot metal flow injected into the hot metal ladle 2 acts as one electrode, and when the hot metal 3 injected into the hot metal ladle 2 reaches the tip of the electrode rod 1, an electrical closed circuit is formed. . On the other hand, the motor 14 is connected to a power source (not shown) via a relay device 22. When the electrical closed circuit is formed, the relay 19 is activated, the motor 14 is driven via the relay device 22, the drum 13 is rotated in the winding direction, and the electrode rod 1 is raised. When the electrode rod 1 separates from the surface of the hot metal 3, the closed circuit becomes an open circuit, the relay 19 is cut off, the motor 14 is stopped, and the electrode rod 1 stops rising. However, hot metal 3 is continuously poured into hot metal pot 2.
is being injected, the hot metal 3 and electrode rod 1 come into contact again,
Similarly to the above-described operation, the electrode rod 1 is raised in stages. As described above, the hot metal level is detected at each position until the tip of the electrode rod 1, which rises by a certain height step by step, reaches the reference setting position A of the hot metal ladle 2. The object of the present invention is achieved by confirming that the hot water level detection device is operating normally.

As a means for detecting whether or not the raised electrode rod 1 has reached the reference setting position A of the hot metal ladle 2, as shown in the figure, the amount of upward movement of the electrode rod 1 is made to correspond to the rotation angle of the holding arm 10, The limit switch 23 is actuated by the holding arm 10 for detection.

In this case, in order to know the progress of the rise in the hot water level, it can be detected by arranging a plurality of limit switches 23 at different positions. Further, as another means, a method of operating the limit switch 23 using the winding drum 13 can also be used.

In addition, as another method, the number of times the electrode rod 1 is raised is set based on the relationship between the amount of soil raised per time of the electrode rod 1 and the set position below the reference setting position A, and the cumulative number of times the electrode rod 1 is raised during measurement is calculated. It may be possible to display the information when the values match.

The tip of the electrode rod 1 has reached the reference setting position A of the hot metal ladle 2, the molten metal level has reached a specific position in front of the reference setting position A, and the electrode rod 1 has been installed in the hot metal ladle 2. The display 24 indicates that the measurement is being carried out (that the measurement is in progress).

Then, the operator instructs various preparations such as replacing the hot metal ladle 2 or switching the gutter 7 according to the instructions from the hot metal level detection device.
Appropriate switching operations can be performed. In addition, since the electrode rod 1 is immediately raised when it comes into contact with the melt gun 3,
The degree of consumption due to hot metal, slag, etc. is extremely small, and since the other electrode uses the injection flow of hot metal etc. as an electrode, this injection flow electrode will not be consumed at all, as long as a continuous flow is formed. It functions as an electrode and can accurately detect the desired level of hot water while pouring continues. Furthermore, even if the rising speed of the hot water level varies, it is possible to accurately detect that the hot water level has reached the reference setting position. When a predetermined amount of hot metal 3 is stored in the hot metal ladle 2 through the above operation, the operator raises and retracts the electrode rod 1 and places the hot metal level detection device in the next hot metal ladle 2.

The hot water level detection device shown in FIG.
Although a type in which the holding arm 10 moves up and down (by a small amount or while moving back and forth) is shown, the present invention also applies even if the holding arm 10 has a structure in which it moves vertically up and down by, for example, a screw shaft (not shown). The invented method can be implemented.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the principle of hot water level detection using an electrical closed circuit, and FIG. 2 is an explanatory diagram of an example of a hot water level detecting device that implements the method of the present invention. In the figure, 1 is an electrode rod, 2 is a container, 3 is molten metal (hot metal), 4 is a lead wire, 5 is a warning lamp, 6 is a power source, 7 is a gutter, 8 is a rail, 9 is a trolley, 10 is a holding arm, 11 is the abutment, 12
is a wire, 13 is a drum, 14 is a motor, 15 is a trolley, 16 is a rail, 17 is a limit switch, 18 is a member, 19 is a relay, 20 is a power source, 21 is a lead wire, 22
is a relay device, 23 is a limit switch, 24 is an indicator,
A is the standard setting position, B is the deposit inside the pot.

Claims (1)

[Claims] 1 The molten metal flow flowing into the molten metal container is used as one electrode, and an electrical closed circuit is formed by contact between the electrode positioned below the reference setting position and the rising molten metal surface, and this electrical closed circuit is As a signal, the operation of raising the electrode to separate the electrode from the hot water surface and opening the closed circuit is repeated until the electrode reaches the reference setting position, and the electric circuit is opened and closed, A method for detecting the level of molten metal in a molten metal container, characterized by displaying the position of the electrode on its way up and the arrival of the electrode at a reference setting position.