JPH03219007A - Detecting method of slopping, device therefor and its calibration method - Google Patents

Abstract

PURPOSE:To detect the development of slopping in a converter with good accuracy by setting plural load cells at the prescribed interval in diameter direction of outer circumference of a lance and executing synthesization of vectors of the detected vibration of lance. CONSTITUTION:A supporting metal 6c is supported by a freely rotatable manner using connecting pin 6b at the end part of a freely extendable/contractable jack shaft 6a in a jack 6, and the load cells R1, R2, R3 are fixed at the other end side of the supporting metal 6c, respectively and a pressing metal 7 is fixed at the other end side of each load cell R1, R2, R3. These load cells R1, R2, R3 are fitted at a divided angle of 120 degree in the diameter direction of lance 4 through a pressing metal 7, respectively. In this constitution, exciting force acted on the lance 4 is measured at each load cell R1, R2, R3 and this output is inputted to a computing element 25 for synthesization of vectors through each amplifier 21 for load cell, low pass filter 22, effective value computing element 23 and interval computing element 24. The resultant vectors S and declination angle theta in the lance 4 are calculated. By comparing this synthesized value with the detected level value, the slopping can be detected with good accuracy.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a slopping detection method that can detect with high precision the occurrence of slopping that occurs in a converter, especially in converter blowing. The present invention relates to a detection device and a method for calibrating the detection device.

[Conventional technology]

A converter is used to produce molten steel by blowing oxygen jet from the tip of a lance onto hot metal poured into the furnace, or by converting it as a slag-forming agent during blowing. Scale, iron ore, or fluorite is charged into the furnace, and these are melted by the temperature inside the converter and become slag, which contributes to the production of molten steel.

It is preferable that the slag foams to some extent, that is, it causes foaming, but if excessive foaming occurs, it will eject from the converter mouth and cause slopping, scattering granulated iron outside the converter and reducing the yield. This not only has a negative effect on the in-furnace control of the oxygen gas ejected from the lance, but also damages ancillary equipment. Not only is it necessary to carry out standard work such as squeezing, but it also harms the improvement of work efficiency and disturbs blowing control, resulting in a decrease in the rate of blowing. It is necessary to predict or detect the occurrence of slopping and take appropriate slopping suppression operations.

The following methods are known for predicting or detecting the occurrence of slopping.

■ Acoustic method This acoustic method is disclosed in, for example, Japanese Patent Publication No. 57-53841 and Japanese Patent Publication No. 63-56931, as shown in Figure 1) of the schematic diagram of the configuration. A sound collecting microphone α is installed at the tip of a branch pipe (12a) installed in the exhaust gas duct α2 above the furnace mouth (1a) of the converter (1).
The microphone α0) collects the sound generated due to the occurrence of slopping, and receives the sound through a frequency filter (1υ) to generate a slopping signal.

In addition, the material that passes through the exhaust gas duct f12 and is inserted into this converter (1) from the furnace opening (la) of the converter (1) becomes the raw material for the molten steel in this converter (1). Hot metal (2)
This is a lance (4) for spraying an oxygen jet on the air.

However, this acoustic method is easily affected by N2 purge and ambient noise, and has the problem of low slopping detection accuracy.

■ Monitoring method using a fiberscope In this method, the inside of the converter is monitored using a fiberscope, and slopping is detected by detecting changes in color tone and light intensity.

However, this monitoring method using a fiberscope has an economic disadvantage in that it is extremely disadvantageous economically due to the cost of the fiberscope and maintenance problems.

■Lance vibration measurement method using a load cell The lance vibration measurement method using a load cell is described, for example, in Japanese Patent Application Laid-Open No. 63-650.
12 and Japanese Unexamined Patent Publication No. 631001) No. 8, the configuration of the slopping detection device will first be explained with reference to FIG. 12, which is an explanatory diagram of its configuration, and FIG. 13, which is an explanatory diagram of the arrangement of the load cell. To explain with reference to
The code (1) shown in Figure 2 is a converter having a well-known configuration, and inside this converter (1) there is hot metal (2) which is the raw material for molten steel.
) is poured, and slag (3) is present on the surface of the molten metal (2). In addition, the furnace opening of the converter (1) (
A lance (4) is vertically inserted through the lance (1a), and this lance (4) is supported so as to be movable up and down by a carriage (5) equipped with detection means for detecting the occurrence of slopping.

Specifically, as shown in FIG. Jacks (6) are arranged radially around the radial center of (4), that is, at a center angle of 120 degrees, on the upper surface of the lower plate of the carriage (5), and these jacks (6) (R1), (R2), (
R3) is supported. In other words, these load cells (R1), (R2), and (R3) are connected to the jack shaft (6a) as shown in FIG. 14 and FIG. ) is supported by a support fitting (6C) connected by a connecting pin (6b) vertically supported at the tip.

Furthermore, the support metal fitting (6C) is provided with a through hole drilled in the U-shaped pressing metal fitting (7) that is pressed against the outer peripheral surface of the lance (4) or both protrusions thereof. A support shaft (7a) provided is loosely fitted and supported rotatably around a horizontal axis, and the load cell is pressed against the inner bottom surface of this press fitting (7).

Incidentally, vertically and parallelly disposed outside the carriage (5) are lifting rails (9) that guide the carriage (5) in the vertical direction.

Therefore, the vibrations generated due to the occurrence of slopping are transmitted to these three load cells (R1) through the lance (2).
, (R2), (R3), and this detection signal is
As shown in Figure 16 of the vibration analysis block diagram, an amplifier (21), a low-pass filter (21) that removes high frequency components (
22), the average value of the low frequency around several Hz is inputted to an arithmetic unit (23) that efficiently calculates it, and the average value obtained by this arithmetic unit (23) is added by an adder (24). The output of this adder (24) is an arithmetic unit which receives a preset detection level value, compares this detection level value with the added value, and outputs a slopping suppression instruction. (25), and if the added value is larger than the detection level value, it is determined that slopping has occurred.

The most important point in the lance vibration measurement method using a load cell is how to distinguish the vibration source of the lance (4).

That is, in addition to slopping, the excitation force applied to the lance (4) is caused by, for example, the reaction force of the oxygen jet and the input of auxiliary materials into the converter.

However, based on the reaction force of the oxygen jet, the lance (4)
The frequency of the vibration applied to the lance (4) is several kHz, and the addition of auxiliary raw materials is sporadic, whereas the vibration frequency of the lance (4) caused by slopping is several Hz and continuous. Therefore, they can be easily distinguished. The lance vibration measurement method using a load cell has the advantages of higher slopping detection accuracy and lower cost than the above two cases.

[Problem to be solved by the invention] As mentioned above, the lance vibration measurement method using a load cell using a slopping detection device has the advantages of high slopping detection accuracy and low cost. However, it still has the problems described below.

First, in the slopping detection method, the magnitude of the detected signal often differs for each blowing, so if the preset detection level value is held constant, the slopping The drawback is that detection accuracy decreases.

In other words, this is due to the fact that the average value of the detection values detected by multiple load cells may be small, and it may be determined that slopping has not occurred even though it has occurred, or conversely, it may be determined that slopping has not occurred even though it has occurred. The so-called over-detection problem is also occurring. There are two possible ways to solve this problem:

First, the first method is to increase the detected value. In other words, among the detected values detected by multiple load cells,
It may be considered that it is sufficient to adopt only the maximum value. However, the direction of vibration received by the lance or slopping does not necessarily match the direction in which the load cell is installed.
In such a case, although it is called the maximum value, its absolute value is not necessarily large, and this cannot be a fundamental solution to the above-mentioned problem.

Next, the second method is to set the detection level to a low level. However, while lowering the detection level value improves the slopping detection accuracy, it also increases the rate of overdetection, and this cannot be a fundamental solution to the problem.

On the other hand, in slopping detection devices, the lance is usually replaced periodically due to metal adhesion or wear, so the lance is sometimes installed so that the center line of the load cell coincides with the radial center of the lance. Is it necessary to align the lines so that the lance is not necessarily straight?
As shown in Fig. 15, load cells (R3), (R2)
, (R1), these load cells (R
1), (R2), and (R3) do not align with the radial center of the lance (4), resulting in a discrepancy, and the supporting metal fitting (6)
C) is pressed against the inner surface of the protruding part of the pressing metal fitting (7), and a part of the vibration force of the lance (4) is borne by the pressing part, so that as a result, the load cells (R1) and (R2 )
In addition to reducing the vibrational force acting on , (R2),
It is difficult to check the uniformity of the tightening force when installing the load cells (R1), (R2), and (R3) and the difference in the level of play in the carriage.
2) (R3) Since comprehensive calibration including the vibration analysis circuit including the support fitting (6c) cannot be performed, the accuracy of the vibration measurement values obtained is not sufficient, and the occurrence of slopping cannot necessarily be accurately detected. The drawback was that it was not possible.

Accordingly, an object of the present invention is to provide a slopping detection method with high slopping detection accuracy and less overdetection, a detection device thereof, and a method of calibrating the detection device.

[Means to solve the problem]

In the conventional method for detecting slopping using a load cell, the vibration detection values detected by the load cell are simply averaged, and the average value may result in a small signal. The above-mentioned problem has been solved by paying attention to the fact that the entire slopping detection device cannot be adjusted even though the slopping detection method is carried out, and therefore, the gist of the slopping detection method according to the first aspect of the present invention is as follows. , the vibration of the lance is detected by a plurality of load cells arranged at predetermined intervals around the radial center of the lance on the outer periphery of the lance inserted from the furnace mouth of the converter, and the detected detection signal is transmitted. In a slopping detection method that predicts the occurrence of slopping in a converter by receiving and calculating and comparing the magnitude of the calculated value and a preset detection level value, the detection signal is vector-synthesized. It is characterized by

In addition, the configuration of the slopping detection device according to the second aspect of the present invention is such that the lower part of the slopping detection device is pressed at a predetermined interval on the outer periphery of a lance inserted from the furnace mouth of the converter by a carriage that can be raised and lowered, and the lance is expanded and contracted. In a slopping detection device that detects vibrations of the lance using a plurality of load cells supported by the device, a support fitting is supported swingably around a vertical axis at the tip of a telescoping rod of the telescoping device, the support fitting One end side of the load cell is fixed to the load cell, and a pressing fitting to be pressed by the lance is fixed to the opposite side of the supporting fitting on the other end side of the load cell.

Further, the configuration of the slopping detection device according to the third aspect of the present invention is such that the lower part of the slopping detection device is pressed at a predetermined interval on the outer periphery of a lance inserted from the furnace mouth of the converter by a carriage that can be raised and lowered, and the lance is expanded and contracted. In a slopping detection device that detects vibrations of the lance using a plurality of load cells supported by the device, an annular body supported by a telescoping device is fitted onto the lance, and the annular body allows the plurality of load cells to adjust their diameters. It is characterized in that it is supported so that its position can be freely adjusted in the direction of the center of the direction.

Further, the gist of the method for calibrating a slopping detection device according to the fourth aspect of the present invention is to apply a predetermined excitation force to a part of the lance to which the detection section of the slopping detection device is attached, and to The slopping detection device detects the vibration of the lance generated by the slopping detection device, and also checks the adjustment accuracy of the load cell and vibration analysis circuit that constitute the slopping detection device.

[Effect]

According to the slopping detection method according to the first invention, the excitation force acting on the lance is measured by each load cell,
These measured values are vector-combined, and this combined value is compared with the detection level value.

Further, according to the slopping detection device according to the second invention,
Since the support bracket is rotatable around the vertical axis, it follows the bending of the lance and the center line for detecting the load on the load cell can always be directed to the radial center of the lance, and it also prevents the load cell from shifting in the horizontal direction. It never occurs.

Further, according to the slopping detection device according to the third invention,
Since the load cell is supported by an annular body fitted onto the lance, the center line of the shear for detecting the load on the load cell can always be directed toward the radial center of the lance, regardless of how bent the lance is.

According to the method for calibrating a slopping detection device according to the fourth aspect of the invention, when a predetermined vibration force is applied to the lance by the vibration excitation device, the lance vibrates in response to the predetermined vibration force.

This is then detected by the slopping detection device,
Based on this detected value, it is possible to check the adjustment accuracy of the load cell and vibration analysis circuit that constitute the slopping detection device.

〔Example〕

Embodiments according to the present invention will be described below with reference to FIGS. 1 to 10.

First Example This first example is shown in Fig. 1, a schematic diagram showing the entire converter in which a lance equipped with a slopping detection device is inserted, and a partial cutaway of the slopping detection device. Figure 2 (a+, (bl) for explaining the main part configuration, Figure 3 for the schematic vibration analysis block diagram of the slopping detection device, Figure 4 for the block diagram showing the calculation flow, and the actual measured vibration by each load cell. Figure 5 (a) of the waveform explanatory diagram, Figure 5 (bl, (C)) of the output comparison diagram, Figure 6 of the state explanatory diagram for the installation of the vibration exciter, and the schematic configuration of the vibration exciter Figure 7 (a) of the explanatory diagram
), (bl, Fig. 8 of the control circuit diagram of the vibrator, Fig. 9 (a) of the inverter output explanatory diagram, and Fig. 9 (bl) of the explanatory diagram of the vibration waveform state of the lance caused by the vibrator. Components that are the same as those of the prior art and components that have the same functions will be described below using the same reference numerals.

First, the overall configuration is approximately the same as the conventional one as shown in Fig. 1, and the lance (4) is supported by a carriage (5) that is guided in a vertically movable manner by a lifting rail (9). The lower part is inserted into the converter (1) through the furnace mouth (1a). Further, the outer periphery of the lance (4) is
5) A structure that is pressed by the tip of a jack (6) which is arranged on the upper surface of the lower plate at 120 degree intervals around the radial center of the lance (4) and has a load cell built into the tip. It has become.

On the other hand, the installation of the row 1 cell is shown in Figures 2 (a) and (b).
), the connecting pin (6b) supported at the tip of the extendable jack shaft (6a) of the jack (6) allows the support fitting (6c) to freely rotate around the axis of the connecting pin (6b). While supporting the load cells (R1), (R2), (R3) on the other end side of the load cells (R1), (R2), (R3), the load cells (R1), (R2), (
A pressing metal fitting (7) having a contact portion for contacting the outer circumferential surface of the lance (4) was fixed to the other end of R3). In addition, the assembled state of each of these parts is such that the radial center of the connecting pin (6b), the support metal fitting (6c) and the pressing metal fitting (7) that support these load cells (R+), (R2), and (R3) are connected. The center of the fixed position of the press fitting (7) and the center of the abutment part of the press fitting (7) are arranged in a straight line.

Therefore, to explain the working mode of the detection device having the above configuration, even if the lance (4) to which the vibration force of slopping is transmitted is bent, the load cell (R1), (R
2), (R3) are installed at an angle of 120 degrees with respect to the radial center of the lance (4).
4) At the radial center of the load cells (R1), (R2),
The center line passing through the center where the load acting on (R3) is to be detected coincides, and these load cells (R1) and (R2)
, (R3) due to the occurrence of slopping (
Since the vibration force (4) is accurately transmitted, this vibration force can be detected accurately.

In other words, these load cells (R1), (R2), (R
3) does not cause slippage in the horizontal axis direction like conventional load cells, so the load cells (R3), (R2), (R3)
The vibration force transmitted to the sensor is no longer attenuated, making it possible to improve measurement accuracy.

Furthermore, as shown in Figure 2 (bl), even if the jack shaft (
Even if the longitudinal axis of 6a) does not coincide with the radial center of the lance (4), it will not cause any particular hindrance to the support of the lance (4) by the jack (6); Is it possible to achieve this?

Next, to explain the configuration of vibration analysis with reference to Fig. 3, the outputs of the three load cells (R1), (R2), and (R3) are transmitted through the respective load cell amplifiers (21) and Robuss filters (22). After passing through the rms value calculator (23), which efficiently calculates the average value of a low frequency of about several Hz,
Each of the outputs of this interval calculator (24) passes through an interval calculator (24) that performs an interval average calculation for a time period of around seconds, and then passes through a vector composite calculator (25) that performs a vector composite calculation.
It is now entered into

Incidentally, in actuality, the section after the interval calculator (24) is configured to perform program processing using a dedicated microcomputer.

In the vector synthesis calculation described above, first, based on the following equation, the X-direction component and the X-direction component of the vibration waveform acting on the lance are used, and then the combined signal S and the argument θ indicating the vibration direction of the lance are calculated.

X=a sinψ, +b sinψ2+csinψ3
−−−■Y==acosψ+ +b cosψ2+CC
O3ψ3−−−■S= (X2+Y2)””−−−−−
−−−−−−−−−−−−−−■θ=tan −' (
Y/X)
■However, a in the above formula is a value based on the detection signal detected by the load cell (R1), and b is a value based on the detection signal detected by the load cell (R2).
C is a value based on the detection signal detected by the load cell (R3),
Furthermore, ψ1 is the installation angle (0 degrees) of the load cell (R1),
ψ2 is the installation angle (120 degrees) of the load cell (R2), ψ
, respectively indicate the arrangement angle (240 degrees) of the load cell (R3).

Then, the vector diagram of S1θ, a, b, and c was displayed on a CRT and used for operator monitoring.

The details of the above calculation procedure will be explained below with reference to FIG.
Load cells (R3), (R2), (R
A(tl
), B (t, ), and C(t, ), and the vibration waves after passing these through the low-pass filter (22) will be described as a (tl, b (tl, c (tl), respectively).

■ First, in the first step, Δ
Determine whether the time has elapsed.

This Δt is set according to the definition of Δt=1/2f, and this f corresponds to the upper limit cutoff frequency of the vibration wave by the low-pass filter (22), and is usually set to 10 Hz or less from experience. It is something that will be done.

In the case of No, data is acquired until the time Δ is reached,
If the result is Yes after the time Δ has elapsed, the process proceeds to the second step.

■ In this second step, A(t,), B(t
After sequentially reading C(tl) (i=I to n), the process proceeds to the third step.

■ In this third step, the above-mentioned read value is compared with a certain value α, and if the read value is equal to or less than α, it is determined that the output line of the load cell is disconnected, and an alarm is issued. or will be issued.

Note that the above α is a value set based on experience.

On the other hand, if the read value is larger than α, that is, if the result is No, the process proceeds to the fourth step.

(2) In this fourth step, the absolute value of each of the above-mentioned read values is calculated, and the process proceeds to the fifth step.

■ In this fifth step, following the summation calculation of each absolute value, the equally weighted moving average value a,
Calculate b and c, respectively, and proceed to the sixth step.

(2) In this sixth step, the following calculations are performed in sequence.

First, the above formula ■; %formula% The X component of the vibration is calculated from

In this formula, φ1, ψ2, and ψ3 are the installation angles of the load cells, and since each load cell is placed at equal intervals of 120 degrees from the radial center of the lance, ψ is
= 0 degrees, ψ2 = 120 degrees, ψ, = 240 degrees, and by substituting them into the above equation (■), the equation (■) becomes: ■It can be transformed into.

Next, the above formula ■; %formula% The Y component of the vibration is calculated from

In this equation, by substituting ψ1=θ degrees, ψ2120 degrees, and ψ2=240 degrees as angles, the equation (2) can be transformed into Y=a-0, 5b-0, 5cm--=■.

Therefore, the above equation 0, which is the signal composite vector S: S= (
By substituting the 0 expression as X and the 0 expression as Y into X2+Y2)'', we can obtain (a2+b2+c2-ab-bc-ca)''.

In addition, in the above, ψ, = 0 degrees, ψ2 = 120 degrees, ψ3
Calculated as = 240 degrees, the arbitrary reference angle is set to 0 degrees, and the angles of ψ1, ψ2, and ψ3 are calculated, respectively.
It is easy to understand that the same results can be obtained by substituting these angles into the above equations.

Therefore, as shown in FIG.
, and the amplitude a is output from the load cell (R3), the combined vector S obtained by the combination is calculated by the conventional simple average, as shown in Figure 5 (bl) and Figure 5 (C). In comparison, the value is sufficiently large, and in addition to improving the slopping detection accuracy, it is possible to reduce overdetection to about several percent.

In addition, in FIG. 5(C), a signal that becomes a conventional simple average is shown by a solid line, and a signal that becomes a vector composite value is shown by a broken line.

By the way, is it okay to compare the magnitude of the composite vector S and the detection level value?In the case of this embodiment, in order to further improve accuracy, it is possible to compare the magnitude of the composite vector S and the detection level value. We were able to obtain good results by subtracting the composite component of the signal 100 from S to obtain the value So (So "5-s), and comparing this with the detection level value to determine the occurrence of slopping. .

The above composite component τ is 5=asin(ψ1-θ)+bsin(ψ2-θ)+c
It is expressed as sin(ψ3−θ).

Furthermore, the deflection angle θ indicating the direction of vibration of the lance is calculated using the formula ■ θ=
It is determined by substituting the 0 expression and the 0 expression into X and Y of jan -' (Y/X). The equation obtained by this is θ=jan−
'x ((2a-b-c)/3''' (b-c)),
From this equation, we can determine the direction of lance vibration, that is, the direction of slopping flow.

In other words, this indicates whether the slag flow is one-sided, random, or rotating. The flow condition of the slag changes when the sloping inhibitor is added, so it can be used to confirm the suppressing effect, and if there is an abnormality in the signal from each load cell, it can be used to check the vibration direction. Since it is relatively stable, it can also be used to detect abnormalities in load cells.

As detailed above, S and θ can be calculated using extremely simple calculations.
By determining this, it has become possible to improve the detection accuracy of slopping and to significantly reduce the rate of overdetection.

ζδ, in an outdated embodiment, we will explain a case where three load cells or three are arranged at equal intervals around the outer circumference of the lance.
The number of load cells, or three, is simply because a sufficient effect can be obtained for practical purposes, but four or more load cells may be installed, and this further improves the slopping detection accuracy. I can do it.

However, as the number of load cells increases, not only does the cost increase, but the calculations become more complex, and the effect obtained is less than the investment effect, so it is not necessarily economically advisable.

In this way, when the occurrence of slopping is detected during operation of the converter or the lance is worn out, it is replaced with a new lance, and the replaced lance is reinstalled with a slopping detection device.

When attaching the slopping detection device to the lance (4), three load cells (R1), (R2), (
R3) Each tightening is due to the difference in force and the difference in play of the carriage.
A removable calibration device as described below was used to perform a comprehensive calibration that included everything from the backlash of the support fittings to the vibration analysis circuit.

The details of the above calibration device are as shown in Figs. 6 and 7, in which a split type hunt m is attached to the outer periphery of the lance (4) with a removable vibration exciter q3 using a bolt and a nut. The vibration exciter α3 has an eccentric weight (13b).
is rotated by an electric motor (13a) with an output of 3 kW.

By the way, the vibration exciter 03 as described above is 50 or 60
Even if it is operated with AC power at a commercial frequency of Hz, the lower limit of the frequency of vibration that can be generated in the vibrator αJ is about 15 to 20 Hz, so as shown in Fig. 8,
Commercial AC power is input to the inverter 04, and a timer 19 causes a voltage of 0N- to be applied between the inverter α4 and the vibrator 03.
The configuration is such that a side circuit is provided with a switch OF5 that operates in the OFF state.

Therefore, this electric motor (13a) converts the input power of the commercial frequency into power of 15 to 20 Hz using the inverter α4, and as shown in FIG. 9(a), the timer (151)
The set time T is 0. By setting 5 to 1 seconds and turning the switch ON-OFF, 1 to 2H
z was converted into alternating current to drive the electric motor (13a) to generate low frequency vibrations.

Then, the lance (4) starts to vibrate, but at the initial stage of vibration, it vibrates with a vibration waveform similar to a so-called humming vibration in sound waves, but the difference in vibration amplitude gradually approaches, and after about 25 seconds, the vibration amplitude decreases. becomes constant.

Therefore, since the degree of vibration generated by the vibrator α3 due to the energy of the input electric power can be grasped, the overall accuracy of the slopping detection device can be determined by comparing this with the constant vibration amplitude of the lance (4) based on this. Can you calibrate it?

This made it possible to further improve the slopping detection accuracy.

In addition, instead of using the vibrator α3 configured as described above, it is sufficient to adopt a method of generating vibrations of a predetermined amplitude in the lance (4), for example, by using a hammer of a predetermined weight to ) can be expected to produce the same effect by impacting with a predetermined impact force.

Second Embodiment This second embodiment will be described with reference to FIG. 10, which is an explanatory diagram of the main part configuration of the slopping detection device. 1
Only the structural points that are different from the embodiment will be explained below.

In other words, this embodiment has three load cells (R1), (R
2) The load cells (R2), (R2), and (R3) are installed at an angular interval of 120 degrees with respect to the radial center of the lance (4), as the mounting direction of (R3) is different. At the same time, the annular body (7b) is fitted around the annular body (7b).
), the tip of the jack shaft (6a) of the jack (6) is connected by a connecting pin (6b), while the load cells (R1), (R2), (R
3) has the same structure as the first embodiment, except that it is supported in the radial center direction of the annular body (7b) so that its position can be adjusted by, for example, screwing in or unscrewing the annular body (7b). did.

Therefore, these load cells (R1), (R2), (R
3) can be made to coincide with the radial center of the lance (4), so the functions and effects of this embodiment are the same as those of the first embodiment.

Of course, as the jack shaft (6a) of the jack (6) expands and contracts, the tip of the jack shaft (6a) is connected to the connecting pin (6b).
) can be connected to the annular body (7b), so the connection work will not be particularly difficult.

The above-mentioned embodiments are merely specific examples of the present invention, and therefore the scope of the technical idea of the present invention is not limited by the above-mentioned embodiments. Design changes etc. can be made freely.

〔Effect of the invention〕

As detailed above, according to the slopping detection method according to the first invention, the excitation force acting on the lance is measured by each load cell, but these measured values are subjected to vector stiffness. As a result of obtaining a value that is reliably larger than the average value, slopping can be detected sufficiently without setting the detection level value low, and as mentioned above, there is no need to set the detection level value low, so over-detection can be avoided. In addition to reliably reducing the occurrence rate of slopping, improved detection accuracy has made it possible to automate slopping detection.

Furthermore, according to the slopping detection device according to the second and third inventions, the center line of the load cell always coincides with the radial center of the lance, and does not shift in the water line direction. Unlike conventional slopping detection devices, the vibration force of the lance is no longer attenuated, making it possible to improve slopping detection accuracy. It has become possible to maintain a constant quality level.

Furthermore, according to the method for calibrating a slopping detection device according to the fourth aspect of the invention, it is possible to very easily calibrate the entire slopping detection device including the carriage that supports the lance, and the slopping detection device can be calibrated with ease. Detection performance can be further improved.

Therefore, according to the present invention, the occurrence of slopping can be detected more accurately, and an extremely large effect on labor saving and maintaining and improving the quality of steel products can be obtained.

[Brief explanation of drawings]

Figures 1 to 9 relate to the first embodiment; Figure 1 is a schematic structural explanatory diagram showing the entire converter in which a lance equipped with a slopping detection device is inserted; Figure 2 (a) , fb)
3 is a schematic vibration analysis block diagram of the slopping detection device, FIG. 4 is a block diagram showing the calculation flow, and FIG. Actual vibration waveform explanatory diagram by load cell, 5th
Figures (b) and (C) are diagrams to explain the output comparison between the simple average value of the detected values and the vector stiffness value, Figure 6 is a diagram to explain the installation state of the vibrator, and Figures 7 (al and (b) are A schematic configuration explanatory diagram of the vibrator, Fig. 8 is a control circuit diagram of the vibrator, Fig. 9 (a) is an explanatory diagram of the inverter output, and Fig. 9 (bl is an explanation of the vibration waveform state of the lance caused by the vibrator). Figure 1O is an explanatory diagram of the main part configuration of the slopping detection device according to the second embodiment, Figure 1) to Figure 16 relate to the conventional example, and Figure 1) is the slopping detection device according to the acoustic method. FIG. 12 is a schematic configuration explanatory diagram showing the configuration of a slopping detection device using a conventional load cell. FIG. 13 is an explanatory diagram of the arrangement of load cells.
15 and 15 are partially cutaway diagrams illustrating the configuration of the main parts of the slopping detection device, and FIG. 16 is a vibration analysis block diagram. (1)... Converter, (la)... Furnace mouth, (2)...
Hot metal, (3)...Slag, (4)...Lance, (5
)...Carriage, (6)...Jacket, (6a)
... Jack shaft, (6b) ... Connection pin, (6c)
...Supporting metal fitting, (7)...Press metal fitting, (7b)...
- Annular body, (8)... pedestal, (9)... lifting rail, α-shaft... vibrator, (13a)... electric motor for the vibrator, (13b)... Eccentric weight, α small...inverter, 09...timer, αG...switch, 0η...
・Band, (21) Load cell amplifier, (22
)...Low pass filter, (23)...Effective value calculator, (24)...Interval calculator, (25)...Vector synthesis calculator, (RIXR2XR3)...Roto cell. Figure 3

Claims (4)

[Claims] (1) Vibration of the lance is detected by a plurality of load cells placed at predetermined intervals around the radial center of the lance on the outer periphery of the lance inserted from the furnace mouth of the converter. In a slopping detection method that predicts the occurrence of slopping in a converter by receiving and calculating a signal, and comparing the magnitude of the calculated value obtained by the calculation with a preset detection level value, the detection signal is A slopping detection method characterized by vector composition. (2) The vibration of the lance is suppressed by a plurality of load cells whose lower part is pressed at a predetermined interval to the outer periphery of the lance at a predetermined position inserted from the furnace mouth of the converter by a carriage that can be raised and lowered, and supported by a telescoping device. In the slopping detection device for detecting slopping, a support fitting is swingably supported around a vertical axis at the tip of the telescoping rod of the telescoping device, one end side of the load cell is fixed to the support metal fitting, and the other end of the load cell is fixed to the support metal fitting. A slopping detection device characterized in that a pressing metal fitting pressed by the lance is fixed to the opposite side of the side supporting metal fitting. (3) The vibration of the lance is suppressed by a plurality of load cells whose lower part is pressed at a predetermined interval to the outer periphery of the lance at a predetermined position inserted from the furnace mouth of the converter by a carriage that can be raised and lowered, and supported by a telescoping device. In the slopping detection device for detecting slopping, an annular body supported by a telescoping device is fitted onto the lance, and a plurality of load cells are supported by the annular body so as to be adjustable in position in the radial center direction thereof. Characteristic slopping detection device. (4) A predetermined excitation force is applied to a part of the lance to which the detection part of the slopping detection device is attached, and the vibration of the lance generated by the excitation force is detected by the slopping detection device; A method for calibrating a slopping detection device, comprising checking the adjustment accuracy of a load cell and a vibration analysis circuit that constitute the slopping detection device.