JPS58209468A - Detection of timing when molten steel in vessel begins to flow out - Google Patents

Abstract

PURPOSE:To detect the timing when the molten metal in a vessel begins to flow out automatically and exactly by detecting the change in amplitude that arises when the molten metal in a vessel begins to pass through the inside of a conduit. CONSTITUTION:When a rotary nozzle 2 of a ladle 1 is opened, the sand charged for the purpose of preventing sand burning flows out through an air seal pipe 3 first, then molten steel flows out. The amplitude at which the pipe 3 is oscillated by the flow thereof is transmitted to the beam 8 of a mounting device 6 for the air seal pipe so as to operate a vibrometer 10. The change in the amplitude is converted to an electric signal by the vibrometer 10 and is inputted to a signal processing unit 12 via a preamplifier 11, whereby the amplitude of the signal is detected. The unit 12 converts the amplitude to an index and discriminates the index in excess of a certain limit as the outflow of the molten steel, then the processing unit outputs the signal indicating the time when the molten begins to flow out to an automatic restrictor 5 of a rotary nozzle. The opening of the nozzle 2 is restricted by said restrictor, whereby the flow rate of the molten steel is regulated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention automatically detects when the molten metal starts flowing out when the molten metal contained in a container flows out through a refractory conduit attached to the container. The present invention relates to a method for detecting 1flJ at the start of outflow of molten metal in a container.

For example, in the continuous word ``nee'', when pouring into the molten steel in the ladle / into the tandish, or when pouring into the molten metal m-t mold in the danding / yu, the flow of molten steel (43) at the start of 11 people ( If the intersection is a person, a problem arises in which the molten steel that directly collides with the tundish or mold is scattered outside the tundish or mold.

Such splashing of molten steel is very dangerous for the nitriders working in the casting bed.]-1 It lowers the casting yield. Therefore, conventionally, when the molten steel starts flowing out, the molten steel flow 1.1
were being narrowed down.

The flow of molten steel from the ladle to the tundish or from the tundish L to the mold is generally carried out by opening and closing a veriding nozzle attached to the bottom of the ladle or tangine. By the way, when the molten steel starts to flow out due to the sliding nozzle's burning, the time when the molten steel starts to flow out is due to the sand spread on the ladle 11 (part 11) flowing out due to +E when the sliding nozzle is baked, and the nozzle clogging. , does not necessarily correspond to when the sliding nozzle is fully opened, and there is an uncertain slowness depending on the thickness of the sand, its hardness, and the degree of clogging of the nozzle. carried out by 71-t-
there was.

However, recently, oxidation 1'rb + which occurs when molten steel flows out
For IJ+, let the molten steel flow out through a refractory conduit such as an air seal or long nozzle. The only way to determine when the 11ftv molten steel will begin to flow out is to visually and visually detect when it has flowed into the mold and scattered. Since there was a time delay before someone could contact the mechanism, it was difficult to know when the molten steel would start flowing out and to accurately control the flow of molten steel.

As a means to solve the problem mentioned above, a method has been proposed in which when molten steel in a ladle is injected into a tundish, the time tUt at which the molten steel begins to flow out is automatically detected by measuring the @ star of the tundish. d, b. Even with this JJ' method, it is only possible to detect the time when molten steel has leaked from the ladle into the tank 7' inshu.
Measuring instrument 1) Measuring instrument 1
Depending on σ and response, start injection at 11, 'r! There was a problem with the detection of Ill in history.

The present invention is based on the above-mentioned recommendation 71, and the molten metal in the trough 71 inside the container is flowed out through a refractory conduit attached to the container. I bought two drawing machines such as , row cleaner nozzle, sliding nozzle, etc.
(When controlling the flow line of molten metal, is it possible to automatically and accurately detect when the molten metal starts flowing out? (1(, f
When the melt contained in the container is discharged through a refractory conduit attached to each of the above-mentioned vessels, the effluent is discharged into the conduit. ') Change in amplitude that occurs in the conduit when starting the floating anchor ([6・Detection 7
Q') is characterized in that the timing at which the molten metal starts flowing out is detected from the change in amplitude.

Next, the present invention will be explained with reference to examples and drawings.

FIG. 1 is an explanatory diagram showing an example of a place α in which molten steel in a ladle flows out into a tundish as an embodiment of the present invention. In the drawing, 1 is a ladle, 2 is a τJ collector nozzle attached to the molten steel discharge port of ladle l, 3 is an air seal pipe connected to the collector nozzle of rotary nozzle 2, 4 is a tundish, and 5 is a rotary nozzle automatic throttle. 3゜6 is the air seal pipe support device -〇X
The upper part of the air seal pipe is held at one end of the beam 8, which is tiltably supported.
The other end 111111.1 is connected to the rod 9a of the cylinder 9, and the actuation of the beam 8 by the cylinder 9 allows the air seal pipe 3 to be held in close contact with the collector nozzle of the rotary nozzle 2.

10 is a vibration meter attached to the beam 8 of the engineering γ/-L Q ino support device 5 for carrying out the method of the present invention;
A preamplifier that converts the measurement results obtained by vibration d110 into electricity (A), and 12 is a 1g processing device.

In order to cause the molten steel in the ladle 1 to flow out to the tandemion unit 4, the two automatic throttle nozzles are opened with L, and first, the bottom of the ladle is prevented from being burnt by the rotary nozzles f-1. The sand that was being charged flows out through the -f uncy 9 iso:3, and the molten steel flows out.

A flow of sand and molten steel is generated within the seal 3, and the vibration amplitude of the air seal 3 changes with this flow. This vibration (1,
The knee f seal is transmitted to the beam 8 of the 9 ino mounting device 6,
The vibration meter 10 attached to the beam 8 is operated σ, and the vibration signal 1 () converts into an electrical signal 1, f7 Lee I'
A person is sent to the fj processing unit 12 via the on-/'I+
i+7ノ.

1. The signal that the i-α processing device 612 is out of human power is the
, l L bell's /ft, that is, the part that can be considered as an extremely low frequency component)
) After being cut by the filter, the amplitude of the signal is detected.

FIG. 2 shows a waveform diagram of the amplitude of the air sea node 1't detected in this manner. As can be seen from the figure, the amplitude of the vibration of the air seal gib increases at the same time as sand or molten steel begins to flow into the pipe. Therefore, the signal processing device 12 converts this amplitude into an index fL.
L: When a certain limit is exceeded, it is assumed that molten steel is flowing out, and a signal is taken to start molten steel flowing out.

and exits to the rotary nozzle automatic throttle device 5.

In response to this molten steel outflow start signal, the rotary nozzle automatic throttle device 5 causes the rotary nozzle 2 to perform an operation of narrowing its opening, thereby adjusting the flow 41 of molten steel. As a result, the molten steel flowing out from the ladle 1 into the tundish 1 is prevented from leaking outside the tundish 1.

In the embodiment described above, the vibration meter 1 <) is not attached to the beam 8 of the air seal/guino attachment device 6, or the
Vibration transmitting rods 1, 1 each having a rotatable sensing end f1:3 shown in the figure attached to the tip are separately provided, and the sensing end r-
13 to the Gore Seal No. 3, and the vibration transmitting rod 14 to the vibration meter 1 (f = t), the vibration of the air seal pipe 3 may be directly measured. Alternatively, different vibrations may be measured.

Detection of when sand or molten steel begins to flow into the air nol pipe can also be carried out not only by vibration but also by a heavy artillery method using an electromagnetic induction detector. That is,
The electromagnetic induction detector generates a magnetic field with an induced electromotive force of 115 (coil and primary coil).
The two fills of the secondary filter are made up of 1). By adding an alternating current group JJILdi current to the primary coil, the magnetic field is created by the electromagnetic 1'+: 'a influence due to the magnetic permeability of the surrounding objects. is transmitted to the secondary coil, and the signal is transmitted to the secondary coil.
Produces a y electric gradient.

Therefore, it is necessary to place this detector near the air seal pin (3) so that the magnetic field generated by the primary coil passes 1 meter past the air seal (1+, 2).
r'x, ml r 3c cow L: a) The electromotive force reflects the characteristics of the substance inside the air seal +'-71, and the electromotive force is When sand or molten steel is flowing inside the air seal pipe, there is a sharp change (-4). Therefore -c1 From this change, it is possible to detect when sand or molten steel starts flowing into the air seal pipe. .

The explanation given above is based on the case where molten steel in a ladle is injected into a tundish/yield. be able to detect.

As described above, according to the present invention, when the molten metal contained in the container is discharged into the container through the shell or the refractory conduit, the sliding nozzle is used. When controlling the flow of molten metal using a throttle mechanism such as the above, it is possible to automatically and accurately detect the amount of molten metal flowing out/11; It is now possible to control the flow at the start in a timely manner, and allowing the molten metal to flow out of the tundish or mold at the time of inspection prevents fH, making the work safer and increasing the casting yield. It also brings about many wonderful effects in industry, such as increasing the number of people.

[Brief explanation of the drawing]

Figure 1 is an example of this investigation method.
Figures 4 and 2 show the results detected by the method of this invention: t
Waveform diagram showing the amplitude of 'I' S, -Le Guinot, part:
Figure 3 shows another example of this method.
'i, -Runo e Ino, 4...Kunditshu, 5.
・Rotary nozzle automatic diaphragm device i'i, fi...F'
Seal/P-build f-1 device, 7... Support, 8...
Beam, 9 Schilling, 1 ()... Vibration meter, 11.
・Derianzo, 12...G1" i place! 11 (Shin H'
r'r, 13...Detection end r., 1.1...Vibration transmission rod, Applicant 11 Steel Tube Co., Ltd. Agent W Radiation Department Name

Claims (1)

[Claims] When molten metal contained in a container is caused to flow out through a refractory conduit attached to the container, a change in amplitude that occurs in the conduit when the effluent begins to pass through the conduit is detected. . A method for determining the start time of outflow of molten metal in a container, characterized by detecting the start time of outflow of the molten metal based on the change in amplitude.