JPS58166221A - Method for measuring thickness of slag - Google Patents

Abstract

PURPOSE:To detect the thickness of slag with good accuracy by detecting an electric signal at the point of the time when a moving electrode arrives at the top surface of the slag and the point of the time when the electrode arrives at the top surface of molten metal. CONSTITUTION:When a vertically moving frame 7 is moved downward by turning of a motor 8, a pulse signal is generated from a pulse generator 13. When the bottom end 9a of an electrode 9 contacts with the top surface of slag 3, the output of a DC power source 15 is divided by a resistor R and the electric resistance of the slag 3, and an electric signal is obtained. An output is generated from a comparator 16 by said signal, and a pulse from a circuit 18 for generating a count start signal is fed to a pulse counter 22 which starts counting the pulse from the pulse generator 13. When the bottom end 9a of the electrode arrives at the top surface of molten metal 2, a different electric signal is generated, and is fed to a comparator 19 and a signal generating circuit 21 so as to stop counting with the counter 22. The thickness of the slag 3 is displayed with high accuracy on a display 25 through a latch 24.

Description

[Detailed Description of the Invention] This invention is applicable to various types of EL furnace cracking, #i! The present invention relates to a method for measuring the thickness of slag existing in a floating state on molten metal O placed in a vessel ζ inside a vessel. Conventionally, when measuring the above-mentioned thick slag q*s, a pearl is placed in the center of the spring taO*, and after the pearl is pulled up, its par fi is measured.
The thickness of the slag is detected by measuring *-5 of the area where the slag is attached. However, from 1k onwards, such a method suffers from low measurement precision M and interlayer IL.

SUMMARY OF THE INVENTION Accordingly, the present invention aims to eliminate the above problems and provide a method for measuring slag thickness that can accurately measure slag thickness.

The drawings showing the embodiments of the present application will be described below.

l stands for spring, and indicates a ladle as an example. This will be explained by referring to the 0-order measuring mechanism 5K-p, where tL represents the molten metal stored in the spring vessel, and S represents the slag floating on top of it.

・ is the fulcrum, 1 is the lifting frame, which is mounted so that it can move up and down with respect to the support 6 =, a is the mo I for the ascending WI#IIkfw, and this is the opposite configuration. ! The mechanism is designed so that the elevator frame 1 can be moved up and down by rotation and movement. The meeting is elevator slot 1
05! The measuring electrode 1, which can be attached to the fist, has a double structure of an external electrode and an internal electrode. At the same time, the electrodes 0, m, and u are made of an insulating material and are electrically separated by a 9-substrate tU. Incidentally, the above-mentioned external electrodes and internal electrodes U are formed using arbitrary metal materials, which may be the same material or different materials. The electrode t may have a structure in which two metal rods are placed side by side.Ts indicates a nine-pass generator I that is attached to the lifting frame 7, and a good number of pulses are emitted according to the lifting distance of the lifting frame 10'. It is configured to occur.

The following KM designates a measuring circuit, each consisting of well-known circuit elements, namely:
DC power supply (e.g. battery) US, resistance hole, comparator W
, 19. Count start signal generation circuit.

It is a count end signal generation circuit type, manufactured by Pulse Counter Co., Ltd., without a latch, and configured using a display device 2, etc.

In the above configuration 410, when the elevator frame 1 is lowered due to the rotation of the motor, a pulse signal is generated from the A/X$F generator in response to the lowering of the elevator frame 1. Then, as the lifting frame 1 descends, the lower end of the electrode -a touches the upper rTJK of the pufferfish 1.
When in contact, the electrical conductivity (electrical resistance) of the pufferfish 8 is different from that of mineral air, so the output of the DC power supply is divided between the resistance hole and the electrical resistance of the slug 1. That is, the lower end of the electrode a
An electric signal is obtained in which the air is in contact with puffer fish 1. When such an electrical signal is obtained, the comparator generates an output, which causes the count start signal generation circuit type to generate the count start signal as a pulse counter! 2 is output. The comparative voltage setting device U attached to the comparator IIIK is used to measure the electrical conductivity (
The comparator iris is adjusted to produce an output when a signal of nine voltages is available (electrical resistance).

When the count start signal is input to the pulse counter section as described above, the pulse counter 22 outputs the pulse v energy v-! Start a run F of the number of pulses output from the thigh.

The lifting frame 1 further descends, and the lower end of the electrode A eventually reaches the bath water 2.
When the lump of puffer fish 1 reaches the nose surface and touches the upper surface of the molten metal, the output of the DC power source is divided into voltages by the resistance hole and the electric resistance of the bath water. In this case, the electrical resistance of the molten metal is different from that of slag 1 (very small vh), so the value of the voltage-divided electrical signal is different from that of slag 1, and the signal shown above is obtained. And Combare! The mackerel produces an output, and the output causes the count end signal generation circuit n to pulse the count end signal! Output towards the carp. The nine comparison voltage setting devices attached to the comparator 19 are as follows:
The electrode 9 of the measuring device @S is adjusted so that the comparator produces an output when an output signal of a voltage corresponding to the electrical conductivity (-air resistance) K of the hot water 2 is obtained as described above.

When the INK count end signal is received by the pulse counter, the pulse counter stops counting the pulses sent from the pulse controller.

As mentioned above, the number of pulses counted by the counter T/IK is the number of pulses that the elevator frame 1 has descended from when the lower end 9a of the electric @S came into contact with the surface of the blowfish 3 until it came into contact with the surface of the molten metal 2. The number of pulses corresponding to the distance, or in other words, the number of pulses corresponding to the thickness of the pufferfish 1, is sent to the display lls via the foot arm, and the display shows the number of pulses. Displays the thickness of the sufugoo according to the belief.

For example, a digital display is used as this display, but other structures may also be used.

I did the above ellK and measured the slag inside one O-1 and I! When measuring the thickness of the IIO-O slag, the motor is activated to raise the lifting frame 7, and the reset switch is operated to reset the counter counter t. Then, the measurement can be carried out in the same manner as described above. The above-mentioned measurement of the steg O may be carried out in the process of lowering the lower end 9a in advance into the molten metal 2 and raising the *** mark. In that case, the KFI may be started when the lower end 9a of the electrode 9 leaves the upper surface of the molten metal 20 at the height 11 where the electrode 9 rises, and the IK count may be terminated when the electrode 9 is moved from the upper surface of the slag 3. In order to perform such electric operation, Kt! I! Fixed @I7. ! Please adjust D.

Next, examples of different embodiments of the above-mentioned electrodes are as follows.

(1) By coating it with an electrically conductive SF material, its life can be significantly extended.

(2) It is preferable to perform KllIm such that the internal and external electrodes have the same wear amount k. For this reason, it is best to select the cross-sectional area, material, etc. of each electrode #i.

As described above, in this endeavor, since the thickness of the slag 3 in the container Ill can be measured, as is well known, the weight of the slag 1 can be known and the molten metal in the container IIl can be measured! It has a useful effect in knowing the amount of O.

Moreover, when measuring the thickness of the slag 3, the electrode 9
A method in which the thickness of the slag O is determined by the distance the electrode 90 moves during the slag at the two points in time, by using electrical signals to capture the point in time when the electrode 9 passes through the slag 3 and the point in time when it passes over the top surface of the molten metal 2. Therefore, the above electrode 9
The electrode can be rapidly passed through the slag, shortening the time the electrode is exposed to the high heat of the slag 3 and the molten metal 2, and preventing the electrode 9 from melting during the process described above. It has the effect of making it possible to measure very high sugar content.

[Brief explanation of the drawing]

Figure 7 shows an example of the present application, and Fig. 7 is a schematic diagram of the measuring device.
・Electrode, -...Measuring circuit 0

Claims (1)

[Claims] To measure the thickness of the slag present above the slag in the container, move the electrode over one of the slag and the upper surface of the molten metal O, and then move the electrode over the other. During the moving process, the electrode passes over the top of the slag 1 and an electric signal is obtained from the electrode, and the electrode passes over the top surface of the molten metal and an electric signal is obtained from the electrode. A method for measuring slag thickness, comprising: determining the moving distance of the electric current at a leap from the obtained time, and measuring the slag OWi.