JP4155229B2 - Method for measuring lining brick thickness of chaotic vehicle, measuring device and method for operating chaotic vehicle - Google Patents

Description

  The present invention relates to a method for measuring the thickness of a lining brick of a kneading vehicle, which can accurately measure the thickness of the lining brick near the hot water generated in the furnace bottom of the kneading vehicle due to thermal shock or mechanical impact caused by hot metal dropping at the time of receiving. And a measuring device and a method of operating a chaotic vehicle.

  In a kneading vehicle that transports hot metal discharged from a blast furnace to the next process, the inside of the furnace body is lined with refractory bricks. Since this lining is damaged and melted with operation and its thickness decreases, it is necessary to repair when the lining thickness becomes a certain thickness or less.

Conventionally, methods for diagnosing the damage situation of the lining thickness inside the chaotic vehicle include measuring the shape of the lining brick inside by inserting an optical shape measuring instrument in the chaotic vehicle, and the iron skin surface temperature of the chaotic vehicle Is measured by thermal image.
JP 54-115160 A JP 61-134612 A Japanese Utility Model Publication No. 5-54529

  Among these, in the former chaotic vehicle, an optical shape measuring instrument is inserted to measure the inner lining brick shape, in order to ensure durability in a hot chaotic vehicle, the water cooling or heat insulating structure of the shape measuring instrument Is necessary and expensive and not economical. Also, in the measurement of only the shape of the inner lining brick, the reference position of each chaotic vehicle such as the core shaft can be found due to the dimensional error of the outer iron skin of each chaotic vehicle and the distortion of the chaotic outer shell due to thermal expansion. However, it is difficult to accurately measure the remaining thickness of the lining brick.

  For this reason, as an actual method for managing the remaining thickness of the lining brick of the kneading vehicle, a method of measuring the iron skin surface temperature of the latter kneading vehicle with a thermal image is generally employed.

  However, in the method of measuring the iron skin surface temperature of a kneading car with a thermal image, it is necessary to measure with the molten iron inside, so the measurement position is limited to the side of the kneading car, and when receiving it, It is difficult to determine the state of melt damage in the hot water contact portion generated at the bottom of the car furnace.

This hot water contact portion is a portion that receives thermal shock and mechanical shock due to dropping when receiving hot metal, and is the fastest wear among lining bricks of chaotic cars (2 in the entire refractory). In addition , the wear speed varies from one chaotic vehicle to another due to variations in the hot metal drop position and variations in the refractory and the hot metal temperature. For this reason, it is difficult to manage the wear state in the hot water contact portion where the wear is severe and abrupt wear occurs locally.

  Therefore, in the worst case, hot metal leakage will occur. Conventionally, the number of times of use of a chaotic vehicle is determined in advance for safe operation, and garage repairs are carried out in which the internal lining bricks are replaced regularly. It was. For this reason, there is a problem that the lining brick may be replaced even when it is still sufficiently thick and usable.

  The problem to be solved by the present invention is that the operation of the kneading vehicle cannot accurately determine the molten state of the hot water contact portion generated in the bottom of the furnace, and the lining bricks are not efficiently used.

The method for measuring the lining brick thickness of a chaotic vehicle according to the present invention is as follows:
The most important feature is to adopt the following configuration in order to accurately measure the molten state of the hot water contact portion generated at the furnace bottom of the kneading car.

( 1 ) A second shape measuring device capable of measuring the outer skin shape by sandwiching the furnace bottom of the kneading vehicle at a known position opposite to the optical first shape measuring device arranged outside the kneading vehicle. Installed and measured the outer skin shape at the furnace bottom of the kneading car by this second shape measuring device, and the lining of the kneading car furnace bottom from the outer surface iron shape data and the lining brick shape data of the furnace bottom inside the kneading car Measure brick thickness.

( 2 ) The second shape measuring device capable of measuring the outer surface skin shape is installed at a known position outside the chaotic vehicle, and the outer surface skin shape data of the chaotic vehicle measured by the second shape measuring device. The distance between the obtained core axis of the kneading vehicle and the lining shape measurement point of the furnace bottom portion of the kneading vehicle measured by the first shape measuring device is calculated to calculate the thickness of the lining brick of the kneading vehicle. Note that the installation position of the second shape measuring device in this case is not necessarily a position where the furnace bottom portion of the chaotic vehicle is sandwiched between the first shape measuring device and the known position outside the chaotic vehicle.

( 3 ) The lining brick thickness is calculated by the following formula.
(Remaining thickness of wear brick) = (Radius of outer shape of chaotic car iron skin) − (Thickness of iron skin, permanent brick thickness and thickness other than wear brick) − (Distance between lining brick shape measurement data point and chaotic car core axis)

( 4 ) Measure with the furnace body of the chaotic car tilted. The tilting angle is not particularly limited as long as the molten metal and slag remaining in the furnace bottom in the kneading car can be discharged from the hot water contact part of the furnace bottom after the hot metal is discharged, but the tilt is about 90 °. In this case, the content remaining in the hot water contact portion flows out to the side surface of the kneading wheel, so that it is desirable to tilt it around 90 °.

Moreover, the lining brick thickness measuring device for a chaotic vehicle according to the present invention is:
In order to carry out the lining brick thickness measuring method for a chaotic vehicle according to the present invention, the most important feature is to adopt the following configuration.

(A) said first shape measuring instrumentation 置及 beauty second shape measuring device is a laser rangefinder capable of scanning the irradiation angle of the laser.

(B) A straight line connecting the installation positions of the first and second laser rangefinders is perpendicular to the rail axis of the chaotic vehicle.

(C) A first laser rangefinder that measures the lining brick shape of the bottom of the chaotic car interior and the outer skin of the chaotic car furnace bottom on the line connecting the installation positions of the first and second laser rangefinders A calibration jig having a known thickness is placed between the second laser distance meters to measure
The relative position between the first and second laser rangefinders can be calculated using the measured distance to both surfaces of the calibration jig, the laser irradiation position, and the tilt angle of the laser rangefinder.

(D) The laser distance meter modulates the laser light intensity to irradiate the object to be measured, detects the reflected laser light from the object to be measured by the light receiving element, and calculates the distance from the phase difference between the irradiated laser light and the received laser light intensity. It is of the light wave ranging method to be measured.

In addition, the operation method of the chaotic vehicle according to the present invention is as follows.
Using the lining brick thickness measuring device according to the present invention, the residual thickness of the lining brick of the chaotic vehicle during operation is measured by the lining brick thickness measuring method according to the present invention, and the repair timing of the chaotic vehicle is determined. Is the most important feature.

  In the present invention, after the hot metal is discharged, the shape of the lining brick at the bottom of the furnace in the kneading vehicle is measured. Can be used efficiently.

Hereinafter, the best mode for carrying out the present invention will be described in detail.
(1) Measurement of hot water lining shape As described above, the hot water contact portion 1b at the bottom of the furnace where the most severe erosion loss occurs, the hot metal discharged from the blast furnace, as shown in FIG. When the inside of the kneading vehicle is inserted from the receiving port 1a, the hot metal 2 that falls is directly hit, and is generated just below the receiving port 1a of the kneading vehicle 1. 1 in FIG. 1 indicates the output of the blast furnace.

For this reason, even after the hot metal is discharged, even if the inside is hot, the first shape measuring device of the optical type that is non-contact from the outside of the kneading car, the shape of the hot water at the bottom of the furnace through the receiving port In other words, it is possible to easily grasp the melt damage status of the hot water contact portion .

(2) Method for measuring the thickness of brick lining bricks The surface position of the refractory lining of the chaotic vehicle at the initial stage is designed by the distance from the core axis of the chaotic vehicle. For this reason, if the core axis of the kneading vehicle can be grasped, the exact amount of melting loss, that is, the remaining thickness of the lining brick can be measured.

However, the core axis may be displaced from the initial design value due to the weight of the chaotic vehicle and the distortion of the iron skin due to aging. Therefore, the second shape measuring device is installed at a position where the relative position is known with the first shape measuring device for measuring the lining brick at the bottom of the furnace in the kneading vehicle, and the measurement can be performed by sandwiching the furnace bottom of the kneading vehicle. Then, if the outer skin shape at the furnace bottom of the kneading vehicle is measured, the thickness of the lining brick can be measured from the outer surface skin shape data and the lining brick shape data at the furnace bottom of the kneading vehicle. This is the method for measuring the lining brick thickness of a chaotic vehicle according to the first aspect of the present invention.

  The core axis is obtained by regression calculation of an approximate arc with respect to the iron shell shape, and the center of the obtained regression arc is determined as the chaotic vehicle core axis. The radius of the arc that recurs may use the design value of the outer shape of the chaotic car skin, but if the radius of the arc is also obtained by regression, the thickness of the brick caused by individual differences in the chaotic car iron skin or distortion due to thermal expansion is calculated. Errors can be suppressed.

(3) Method for calculating the thickness of the lining brick per hot water area As described above, the outer shape of the kneading car is measured with the second shape measuring device, and the kneading car core is determined from the outer hull shape data at the bottom of the kneading car. If the axis is obtained, the furnace core axis can be obtained regardless of the weight of the chaotic vehicle and the distortion of the iron skin due to aging. In this case, if the installation position of the second shape measuring device is a known position outside the chaotic vehicle, the second shape measuring device may not necessarily be a position where the furnace bottom portion of the chaotic vehicle is sandwiched between the first shape measuring device. good.

Since the relative position of the core axis to the first shape measuring device is known, the distance between the lining brick shape measuring point at the bottom of the chaotic car furnace and the core axis is calculated, so that the accurate lining brick of the chaotic car can be accurately calculated. The amount of melting loss, that is, the remaining thickness of the lining brick can be calculated. This is the lining brick thickness measuring method for chaotic vehicles according to the second and third aspects of the present invention.

(4) Lining brick refractories of chaotic cars The fireproof structure of chaotic cars has permanent bricks that are not exchanged inside the outermost iron skin, and they are interchangeable bricks called wear bricks by means of irregular refractories inside them. It is the structure which piled up. Actually, it is necessary to measure the thickness of the wear brick because the repair timing of the chaotic vehicle is determined by the thickness of the wear brick. Therefore, if the remaining thickness of the wear brick is calculated by the following equation, the thickness of the wear brick can be obtained with high accuracy. Hereinafter, the lining brick is also referred to as a wear brick.

(Remaining thickness of wear brick) = (Radius of outer shape of kneading car skin) − (Thickness of iron skin, permanent brick thickness and thickness other than wear brick such as amorphous refractory) − (lining brick shape measurement data point and kneading car Core axis distance)
This is the lining brick thickness measuring method for a chaotic vehicle according to the fourth aspect of the present invention.

Here, the following values are used as the radius of the outer shape of the chaotic car iron skin.
・ When the radius is also calculated when calculating the core axis: (radius of the outer shape of the chaotic car skin) = (radius obtained by regression calculation)
・ If the radius was not calculated when calculating the core axis: (radius of outer shape of chaos car skin) = (design value of outer shape of chaos car skin)

(5) Position of furnace body in kneading car Even if the hot metal in the kneading car is discharged, some contents such as hot metal and slag may remain inside. In such a case, the remaining contents are accumulated in the bottom of the furnace, and the hot water contact part of the bottom of the furnace to be measured is hidden. As a countermeasure, if the furnace body of the kneading vehicle is measured by tilting about 90 °, for example, if the interior is hot, the remaining contents flow to the side of the furnace body and directly touch the hot water contact part at the bottom of the furnace. It becomes possible to measure. In addition, if tilted in this way, it is not necessary to place a shape measuring device directly above the receiving port where the hot air inside the furnace body directly hits, so that the durability of the first shape measuring device is ensured. desirable. This is the lining brick thickness measuring method for a chaotic vehicle according to the fifth aspect of the present invention.

(6) Laser distance meter scanning method The lining brick thickness measuring apparatus for carrying out the lining brick thickness measuring method of the present invention is as follows:
Since it is necessary to accurately grasp the internal measurement position, it is desirable to use a laser-type distance meter for the first and second shape measuring devices. This is the lining brick thickness measuring device for a chaotic vehicle according to the first aspect of the present invention.

  In general, the beam diameter of a laser distance meter is several centimeters or less, and the laser irradiation position can be accurately grasped. In addition, as a laser beam scanning method for measuring the shape, a method of scanning an angle is preferable. If this type is used, there is no need to install a large-scale moving mechanism, and the cost of the measuring instrument can be reduced, which is economical.

(7) Relative position adjustment between both laser rangefinders If the laser rangefinder is placed so that the straight line connecting the installation positions of both rangefinders is perpendicular to the rail axis of the chaotic vehicle, the chaotic vehicle core shaft The direction of is determined without measurement. Therefore, the number of times of shape measurement in the longitudinal direction of the chaotic vehicle can be reduced, and the time required for measuring the outer surface iron skin shape of the chaotic vehicle can be shortened. In addition, it becomes easy to grasp the relative positions of both laser distance meters. This is the lining brick thickness measuring device for a chaotic vehicle according to the second aspect of the present invention.

(8) Calibration method of chaotic vehicle shape measuring device In the above-described lining brick thickness measuring device according to the present invention, both laser distance meters are used to calculate the remaining thickness of the lining brick with respect to the outer surface iron skin shape of the chaotic vehicle. The relative positional relationship between the two and the angle error greatly affect the accuracy of measuring the remaining thickness of the lining brick. In particular, the influence of the relative positional relationship and angle error in the chaotic vehicle circumferential direction is significant.

  Therefore, it is necessary to accurately measure the relative position between both laser distance meters. As a method therefor, a first laser distance meter that measures the lining brick shape at the bottom of the chaotic car interior and a second laser that measures the outer iron skin shape of the bottom of the chaotic car furnace on the line connecting the laser installation positions. Place a calibration jig with a known thickness between the distance meters, and use the measured distance to both surfaces of the calibration jig, the laser irradiation position on the calibration jig surface, and the tilt angle of the laser distance meter. The relative position between both laser rangefinders can be calculated. This is the lining brick thickness measuring device for a chaotic vehicle according to the third aspect of the present invention.

(9) Distance measurement method Because the object to be measured is a lining brick in a high-temperature chaotic vehicle, the external air and the internal high-temperature air are mixed in the vicinity of the receiving port through which the laser beam passes, resulting in a change in temperature. A refractive index variation occurs. For such a measurement object, a laser distance meter using the principle of triangulation causes refraction of laser light and causes an error.

  Therefore, the laser distance meter to be used is preferably a system that measures the time difference from laser irradiation to reflected light reception. In the present invention, since it is essential to use outdoors, it is decided to adopt a light wave ranging method that is inexpensive and has excellent measurement accuracy even when the laser output is low. This is the lining brick thickness measuring device for a chaotic vehicle according to the fourth aspect of the present invention.

  The optical rangefinder laser distance meter modulates the laser light intensity to irradiate the object to be measured, detects the reflected laser light from the object to be measured by the light receiving element, and detects the distance from the phase difference between the irradiated laser light and the received laser light intensity. However, because it is used outdoors, the laser light intensity of the laser rangefinder that can be used is estimated to be low due to the low power density per unit time and cannot be measured by fumes and dust generated inside the chaotic vehicle. Is done.

  However, when a measurement test was performed on an actual chaotic vehicle, fumes were generated from the receiving port of the chaotic vehicle even after the hot metal was discharged by tilting the furnace body of the chaotic vehicle by 90 °. It was found that it was possible to measure without any problem even with a laser distance meter of the optical wave distance measuring system after that.

(10) Chaotic vehicle operation method Conventionally, the number of times of use of the chaotic vehicle has been determined in advance, and repairs in the garage where the internal lining bricks are regularly replaced are carried out. There was a problem that it was not economical.

  Therefore, the remaining thickness of the internal lining brick is measured by the lining brick thickness measuring method according to the present invention by using the lining brick thickness measuring apparatus of the chaotic vehicle according to the present invention at the time of regularly entering the garage. To determine the wear rate and the remaining thickness of the existing lining brick, and determine the next inspection timing. In this way, a chaotic vehicle with a margin in the remaining thickness of the lining brick can optimize the repositioning timing of the internal lining brick, and can efficiently use the lining brick of the chaotic vehicle up to the usable limit. This is the operation method of the chaotic vehicle according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings in FIG.
(1) Device Configuration FIG. 2 shows a device configuration example of the present invention. A first scanning laser for measuring the shape of the lining brick at the hot water contact portion 1b at the bottom of the furnace inside the kneading vehicle through the receiving port 1a with the furnace body of the kneading vehicle 1 in a state where the molten iron has been discharged tilted by 90 °. The second scanning laser distance meter installed at a known position opposite to the first laser distance meter 4a so as to allow measurement with the distance meter 4a sandwiched between the hot water contact portion 1b, respectively. It is arranged outside the car 1.

  These first and second laser rangefinders 4 a and 4 b are arranged such that a straight line connecting the installation positions thereof is perpendicular to the rail axis of the chaotic vehicle 1. The distance between the first and second laser distance meters 4a and 4b and the rail center Rc in the chaotic vehicle 1 is 5 m for the first laser distance meter 4a and 10 m for the second laser distance meter. Arranged.

  Of these, the first laser distance meter 4a has a fixed size of the receiving port 1a, and if it is too far away from the rail, the measurable range of the internal lining is limited. In order to prevent the distance meter from being damaged by the radiant light from the receiving port 1a, a hot-wire cut filter was inserted to suppress an increase in temperature.

  Further, the laser distance meters 4a and 4b are of the optical wave distance measuring method with a measurement distance range of 0.2 m to 40 m and a distance measurement accuracy within ± 3 mm. Further, the laser output is 1 mW or less, the beam diameter is about 10 mm, and conforms to JIS standard class 2, so that it can be used outdoors.

  The laser distance meters 4a and 4b are each provided with an angle adjustment mechanism (resolution: 0.1 °) electrically driven in the vertical and horizontal directions, and are also provided with an inclination angle meter in the vertical direction, and the laser distance meters 4a and 4b. An actual angle of which can be grasped with a resolution of 0.01 ° and a measurement accuracy σ = 0.05 ° was used. An inclination angle meter having such a specification is generally sold if the measurement angle range is about ± 10 °.

  The first and second laser rangefinders 4a and 4b and the angle adjustment mechanism (not shown) are connected to the control PC 5, and can perform angle control of the angle adjustment mechanism, collection of measurement data, and analysis of measurement values. In this manner, the iron skin shape of the outer surface of the kneading car furnace and the lining shape of the bottom part of the kneading car inside the furnace are measured immediately below the receiving port 1a.

(2) Regarding determination method of laser distance meter unit arrangement The first and second laser distance meters 4a and 4b are opposed to each other accurately and are perpendicular to the core axis of the chaotic vehicle 1 accurately. When installed, the relative position can be easily grasped. Hereinafter, the procedure will be described with reference to FIG.
a: Mark the rail center position (“measurement center point C” in FIG. 3) that is the measurement center position of the chaotic vehicle 1.

b: On the rail, points 1 and 2 are provisionally marked at positions 6500 mm away from the “measurement center point C” on both the downstream and upstream sides (the interval between the points 1 and 2 is 13000 mm (= 6500 mm × 2)). Is the distance between the fulcrums of the chaotic vehicle 1).
c: Determine points 3 and 4 that are vertices on the left and right sides of the rail so that they are isosceles triangles with points 1 and 2 as the base (during prior evaluation, determine the vertices using thin wires of equal length) did).

d: The installation positions of the two laser distance meters 4a and 4b and the installation position of the calibration jig 6 are determined on the straight line L1 connecting the points 3 and 4. The position on the straight line L1 connecting the points 3 and 4 is determined in consideration of the distance from the chaotic vehicle 1 and interference with other tracks. If the work so far has been performed accurately, the “measurement center point C” initially determined will be placed on the straight line L1 connecting the points 3 and 4.

(3) Installation angle and height adjustment method of laser distance meter unit Since the installation positions of both laser distance meters 4a and 4b have been determined as described above, the installation of laser distance meters 4a and 4b will be described with reference to FIG. A method for accurately measuring the height and the vertical angle will be described.

a: Both laser distance meters 4a and 4b are installed so that the laser optical axis is at a height substantially equal to the core axis of the chaotic vehicle 1. Note that the ground is not always flat.

b: An optical axis adjustment target (hereinafter, the calibration jig is also referred to as a target), which is the calibration jig 6, is installed at the installation position of the calibration jig 6. The optical axis adjusting target 6 is a plate having a known thickness and a cross target as shown in FIG. The cross target is installed so that the center height of the cross target is the core height of the chaotic vehicle.

c: Adjust the installation angle of both laser distance meters 4a and 4b so that the laser beam irradiates the center of the cross target. Since the laser distance meters 4a and 4b used have a beam diameter of φ10 mm, the alignment accuracy can be sufficiently adjusted within 5 mm. At this time, the internal angle adjustment mechanism is adjusted to the origin (both horizontal and vertical are 0 °).

d: When the adjustment is completed, the tilt angles a1 and a2 of the laser distance meters 4a and 4b and the distance measurement values D1 and D2 to the target 6 are read by the laser distance meters 4a and 4b.
e: Since the thickness t of the target 6 is known, the distance D (mm) between the laser distance meters 4a and 4b and the height deviation h1 + h2 (flatness of the ground) between the laser distance meters 4a and 4b are as follows: Calculate with the formula.

D = D1a + D2a + t
= D1 · cos (a1) + D2 · cos (a2) + t
h1 + h2 = D1 · sin (a1) + D2 · sin (a2)

The relative position accuracy of the laser distance meters 4a and 4b obtained by such a method is as follows.
・ Height direction angle accuracy: 0.05 ° (Inclinometer measurement accuracy)
・ Accuracy between both laser distance meters 4a and 4b: 4.2 mm (= 3 × 2 ^1/2 , equal to measurement accuracy of two laser distance meters 4a and 4b)
-Position accuracy in the height direction: 8.2 mm (= {5 ² + (7500 × sin 0.05 °) ² } ^1/2 , laser beam position reading error and angle measurement error on the target 6)

  The results of the trial calculation of the degree of influence on the lining brick thickness measurement value for each item are shown in FIGS. FIG. 5 is a diagram showing the influence of the angle error in the height direction of the laser distance meters 4a and 4b on the measurement error of the remaining thickness of the lining brick, and FIG. 6 is the error in the installation interval of the laser distance meters 4a and 4b. FIG. 7 is a diagram showing the effect on the thickness measurement error, and FIG. 7 is a diagram showing the effect of the installation error in the height direction of the laser distance meters 4a and 4b on the residual thickness measurement error of the lining brick.

5 to 7, the horizontal axis represents the measurement part angle of the kneading vehicle 1, and the vertical axis represents the residual thickness measurement error of the lining brick. From these trial calculation results, the influence of the relative positional accuracy of the laser distance meters 4a and 4b on the accuracy of the remaining lining brick thickness is calculated as follows. When these considering the laser distance meter 4a, 4b single measurement precision sigma = 3 mm, overall accuracy of the measurement is ^{σ = 8.3mm (= (3 2} +3 2 +2.2 2 +4.2 2 +5.3 2) 1 ^{/ 2} ), and sufficient measurement accuracy can be secured to manage the thickness of the lining bricks of chaotic vehicles.

The numerical values used in the calculation of the overall accuracy of the measurement are the estimated position accuracy and angle measurement accuracy of the equipment used in the examples of the present invention, using the error estimation results shown in FIGS. It was calculated based on the following meanings.
-Thickness measurement error due to angle error in the height direction of both laser distance meters 4a, 4b: 2.2 mm
・ Thickness measurement error due to gap error between both laser distance meters 4a and 4b: 4.2 mm
-Thickness measurement error due to position error in the height direction of both laser distance meters 4a, 4b: 5.3 mm

(4) About measuring method of lining brick residual thickness FIG. 8: is the figure which showed the example of a measurement in an actual chaotic vehicle. The wear brick shape (□ plot) in the chaotic vehicle 1 and the outer surface iron skin shape (Δ plot) of the chaotic vehicle 1 measured using the apparatus according to the above-described embodiment of the present invention are measured between the two laser distance meters 4a and 4b. Based on the relative position information, the image is superimposed on one graph. The remaining thickness of the wear brick was determined by the following procedure. FIG. 9 shows an example of the result of measuring the remaining thickness of the wear brick. According to the present invention, it can be seen that the molten state of the hot water contact portion can be clearly and quantitatively measured.

a: An approximate arc is obtained by regression calculation for the iron skin shape, and the center of the obtained regression arc is set as the core axis of the kneading vehicle 1. As the radius of the arc that returns to the arc, the design value of the outer shape of the chaotic wheel 1 may be used. However, if the radius of the arc is also obtained by regression, individual differences in the iron hull of the chaotic wheel 1 or distortion due to thermal expansion It is even better because it can suppress the brick thickness calculation error caused by the.

b: The distance between the lining brick shape data point and the core axis of the kneading vehicle 1 is calculated.
c: Calculate the thickness of the wear brick according to the following formula.
(Remaining thickness of wear brick) = (Radius of outer shape of kneading car skin) − (Thickness of iron skin, permanent brick thickness and thickness other than wear brick such as amorphous refractory) − (lining brick shape measurement data point and kneading car Core axis distance)

Here, the following values are used as the radius of the outer shape of the chaotic car iron skin.
・ When the radius is also calculated at the time of regression calculation: (radius of outer shape of chaos car skin) = (radius determined by regression calculation)
・ When the radius is not calculated at the time of regression calculation: (radius of the chaos car skin outline) = (design value of the chaos car iron outline)

(5) Measurement stability FIG. 10 shows the results of investigating the time required for measurement by tilting the furnace body by 90 ° using this apparatus. The horizontal axis represents the elapsed time after hot metal discharge, and the ◇ plot in the figure represents the laser reflection intensity at the laser distance meters 4a and 4b. The plot of □ in the figure shows the measurement success rate. As is clear from FIG. 10, the success rate became 100% after 90 minutes from the dispensing of the hot metal, and measurement was possible.

In addition, until 90 minutes have passed since the hot metal was dispensed, the measurement is hindered by smoke generated from the inside of the chaotic vehicle, so the success rate is poor.
From this, it is clear that the lining brick shape inside the chaotic car can be measured sufficiently if the light wave type laser distance meter is waiting for the fumes generated immediately after the furnace body tilts in the chaotic car. It is.

(6) Measurement accuracy After measuring the remaining thickness of the lining brick in the hot state using this device, the temperature of the chaotic vehicle is lowered to room temperature, and the work of actually measuring the remaining thickness of the lining brick is measured by two chaotic vehicles. Went against. FIG. 11 shows the relationship between the measured value obtained by this apparatus and the actually measured residual thickness of the lining brick in the cold state. The difference between the two was a very good result of σ = 7.3 mm, and according to the present invention, it was confirmed that the remaining thickness of the lining brick could be accurately measured actually in the hot state.

(7) About the effect of this equipment In the past, the number of times of use of chaotic vehicles was determined in advance, and garage repairs were carried out periodically to replace the interior lining bricks. There was a problem that it was not economical.

  Therefore, when the conventional garage is regularly entered, the remaining thickness of the lining brick is measured according to the present invention, and if there is a margin in the lining brick thickness, the timing of relining the lining brick is delayed.

  Previously, repairs were often made by stopping the operation of chaotic vehicles thicker than the operable limit brick thickness, but after the introduction of the present invention, the variation in the minimum thickness was small, and the thickness without proper waste It became possible to operate with.

  Thus, by applying this invention, the lining brick of a chaotic vehicle can be used effectively, life extension can be aimed at, and the cost concerning repair can be reduced.

  The present invention is not limited to the above-described embodiments, and it goes without saying that the embodiments may be appropriately changed within the scope of the technical idea described in each claim.

  Needless to say, the present invention is applicable to the shape measurement of various molten steel containers other than the kneading vehicle, as well as the shape measurement of the kneading vehicle in the portion other than the contact portion of the furnace bottom hot water.

It is a figure explaining the cause which the melt-down of a hot water contact part generate | occur | produces directly under the receiving port of a kneading vehicle. It is a figure which shows the Example of this invention. It is a figure which shows the determination method of a laser distance meter unit arrangement | positioning. (A) is a figure which shows the adjustment method of the installation angle and height of a laser distance meter unit, (b) is explanatory drawing of a calibration jig. It is the figure which showed the influence which the height direction angle error of a laser rangefinder has on the lining brick thickness measurement error. It is the figure which showed the influence which the installation space | interval error of a laser distance meter has on the lining brick thickness measurement error. It is the figure which showed the influence which the height direction installation error of a laser distance meter has on the lining brick thickness measurement error. It is the figure which showed the example of shape measurement in the actual chaotic vehicle by this invention. It is the figure which showed the example of a measurement result of lining brick residual thickness. It is a figure which shows the result of investigating time until it becomes measurable by tilting a chaotic vehicle 90 degrees by the apparatus of this invention. It is the figure which showed the remaining thickness measurement precision of the lining brick of the chaotic vehicle by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Chaotic wheel 1a Receiving port 1b Hot water contact part 2 Hot metal 4a 1st laser rangefinder 4b 2nd laser rangefinder 6 Calibration jig

Claims (10)

By the optical first shape measuring device placed outside the chaotic car,
Through torpedo car受銑port after discharging the molten iron, the lining brick thickness measuring method of mixing pig iron wheel you measure the lining brick shape of torpedo car furnace bottom,
A second shape measuring device capable of measuring the outer skin shape by sandwiching the furnace bottom of the kneading vehicle is installed at a known position opposite to the optical first shape measuring device arranged outside the kneading vehicle,
With this second shape measuring device, the outer skin shape at the furnace bottom of the kneading vehicle is measured,
A method for measuring a lining brick thickness of a kneading vehicle, characterized in that a thickness of a lining brick at a bottom portion of a kneading vehicle furnace is measured from the outer surface iron skin shape data and the lining brick shape data of the kneading vehicle in-furnace bottom portion . By the optical first shape measuring device placed outside the chaotic car,
In the method for measuring the thickness of a lining brick of a kneading vehicle, the shape of the lining brick at the bottom of the furnace inside the kneading vehicle is measured through the receiving port of the kneading vehicle after the hot metal is discharged .
At a known position torpedo car outside, it sets up a second shape measuring apparatus capable of measuring the outer Mentetsugawa shape,
The second shape measuring device measures the outer Mentetsugawa shape of torpedo cars,
The core shaft of the chaotic vehicle obtained from the outer surface iron skin shape data of the measured chaotic vehicle ,
Calculate the distance of the lining shape measurement point of the bottom of the chaotic car interior measured by the first shape measuring device ,
A method for measuring a lining brick thickness of a chaotic vehicle, characterized by calculating a lining brick thickness of the chaotic vehicle. In the lining brick thickness measuring method of the chaotic vehicle of Claim 2 ,
It said second shape measuring apparatus sandwiches the furnace bottom portion of the torpedo car, the first shape measuring apparatus that faces known torpedo car lining brick thickness measuring method characterized that you have installed in position. In the method for measuring a lining brick thickness of a chaotic vehicle according to claim 2 or 3 ,
A method for measuring a lining brick thickness of a chaotic vehicle, wherein the lining brick thickness is calculated by the following formula .
(Remaining thickness of wear brick) = (Radius of outer shape of chaotic car iron skin) − (Thickness of iron skin, permanent brick thickness and thickness other than wear brick) − (Distance between lining brick shape measurement data point and chaotic car core axis) The lining brick thickness measuring method for a chaotic vehicle according to any one of claims 1 to 4, wherein the measurement is performed in a state where the furnace body of the chaotic vehicle is tilted . An apparatus for carrying out the method for measuring a lining brick thickness of a chaotic vehicle according to any one of claims 1 to 5,
The first shape measuring apparatus and a second shape measuring apparatus, lined brick thickness measurement apparatus of the mixing pig iron wheel you characterized in that a laser rangefinder capable of scanning the irradiation angle of the laser. Claims 1, 3,
Or claim 4 quoting claim 3;
Or claim 5, which cites any one of claims 4, 3 which cites claims 1, 3 and 3;
Lining brick thickness measuring method according to any one of Te torpedo car lining brick thickness measuring apparatus odor of claim 6 for implementing a
A lining brick thickness measuring device for a chaotic vehicle, characterized in that a straight line connecting the installation positions of the first and second laser distance meters is perpendicular to the rail axis of the chaotic vehicle. In the chaotic vehicle lining brick thickness measuring device according to claim 7 ,
A first laser distance meter that measures the lining brick shape at the bottom of the chaotic car interior and the outer surface iron skin shape of the bottom of the chaotic car furnace on the line connecting the installation positions of the first and second laser distance meters A calibration jig with a known thickness is placed between the second laser distance meters,
The relative position between the first and second laser rangefinders can be calculated using the measured distance to both surfaces of the calibration jig, the laser irradiation position, and the tilt angle of the laser rangefinder. Lining brick thickness measuring device for chaotic cars. In the lining brick thickness measuring apparatus of the chaotic vehicle in any one of Claims 6-8 ,
Laser rangefinder
Laser light intensity is frequency-modulated and irradiated to the measurement object,
The reflected laser light from the measurement object is detected by the light receiving element,
An apparatus for measuring the thickness of a lining brick of a chaotic vehicle, characterized in that it is of a light wave distance measuring method for measuring a distance from a phase difference between an irradiation laser beam intensity and a received laser beam intensity . Using the lining brick thickness measuring device according to any one of claims 6 to 9 , the remaining thickness of the lining brick of the chaotic vehicle during operation is measured by the method according to any one of claims 1 to 5, and the chaotic vehicle A method of operating a chaotic vehicle characterized by determining the repair timing of the vehicle.

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