JP2016006419A - Detection method for surface shape of lining refractory of molten metal processing container, and system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately detect a surface shape of a lining refractory that is under high-temperature atmospheres, with low costs.SOLUTION: A frequency region system laser distance meter 1 measures a distance to the surface of a lining refractory 3 of a molten metal processing container in a state where the lining refractory 3 has a surface temperature of 700°C or higher and 1400°C or lower. A shape detector 2 detects a surface shape of the lining refractory 3 on the basis of distances to a plurality of points on the surface of the lining refractory 3 measured using the laser distance meter 1.

Description

  The present invention relates to a method and a system for detecting the surface shape of a refractory lining a molten metal processing vessel that is suitable for detecting the surface shape of a refractory lining a molten metal processing vessel.

In the steel industry, molten metal processing vessels with refractories lined, such as kneading wheels, hot metal ladle, converter, molten steel pan, degassing furnace, tundish, etc. are used in the process of refining hot metal and molten steel.
Although the refractory lining the molten metal processing vessel wears with the increase in the number of treatments, the degree is not necessarily uniform depending on the location. Therefore, in order to use the molten metal processing vessel stably for a certain period of time, check it regularly. Work is done. Conventionally, after the use of the molten metal processing vessel is periodically interrupted and cooled, the amount of wear of the lining refractory is measured, and the inspection work of repairing only the portion where wear has progressed remarkably has been performed. It was.

  In order to measure the wear amount of the lining refractory, it has been proposed to detect the surface shape of the lining refractory of the molten metal processing container using a laser distance meter. For example, Patent Document 1 and Non-Patent Document 1 disclose a configuration using a time-domain laser distance meter. Patent Document 2 discloses a technique using a phase range type laser distance meter.

Japanese Patent No. 4531057 JP 2005-337922 A

Refractory magazine Vol. 60 No. 9 483-487 (2013)

Since the refractory has a large thermal expansion / shrinkage rate, a phenomenon that the lining refractory contracts greatly occurs when the molten metal processing vessel is cooled. Such shrinkage of the lining refractory causes cracks in the interior. If a crack occurs in the lining refractory by cooling the molten metal treatment container for inspection work, when the molten metal treatment container is reused, this crack will be the starting point and the refractory will be worn out. There is a problem that the use period of the molten metal processing container is shortened.
In order to eliminate the problems caused by cooling the molten metal processing vessel for inspection work, during the use of the molten metal processing vessel, for example, until the molten metal is discharged from the molten metal processing vessel and then poured In addition, it is required to detect the surface shape of the lining refractory.

Here, the time domain method cited in Patent Document 1 and Non-Patent Document 1 is a method for obtaining the distance from the delay time of the reflected light reciprocating the target.
However, in the time-domain laser rangefinder, a short pulse wave is used for the laser light, and the clock speed of the electronic circuit constituting the clock circuit is on the terahertz order, so that the apparatus configuration is very expensive. .

The phase region method cited in Patent Document 2 is a method for obtaining a distance from a phase difference between an intensity signal of reflected light reflected from the surface of a target object and an intensity signal of an outgoing wave.
In a phase-range laser rangefinder, the continuous-wave laser beam is a general-purpose laser beam, the number of repetitions of the laser is in the Hertz order, and the clock speed of the electronic circuit that constitutes the phase difference detection circuit is also in the Megahertz order. Therefore, the device configuration is inexpensive.
However, in the phase domain method, it is impossible in principle to measure the distance to the target object in the high-temperature atmosphere. When the target object is in a high-temperature atmosphere, the intensity signal of reflected light traveling through the high-temperature atmosphere is subject to fluctuations due to refractive index fluctuations in the high-temperature atmosphere. As a result, the intensity signal of the reflected light reflected from the surface of the target object in the high temperature atmosphere is different from the intensity signal of the reflected light reflected from the surface of the target object in the room temperature atmosphere. In other words, when measuring a distance using a phase range laser distance meter for an object that is set a certain distance away from the laser distance meter, the target object is in a room temperature atmosphere and at a high temperature. It becomes impossible to measure as the same distance when in the atmosphere.

  The present invention has been made in view of the above points, and an object of the present invention is to enable accurate detection of the surface shape of a lining refractory in a high-temperature atmosphere at a low cost.

The method for detecting the surface shape of the refractory lining the molten metal processing container according to the present invention is a method for detecting the surface shape of the refractory lining the molten metal processing container to detect the surface shape of the refractory lining the molten metal processing container. In the state where the surface temperature of the lining refractory is 700 ° C. or more and 1400 ° C. or less, the distance to a plurality of points on the surface of the lining refractory is measured by using a frequency range type laser distance meter. It is characterized by detecting the surface shape of an object.
Another feature of the method for detecting the surface shape of the refractory lining the molten metal processing container according to the present invention is that the laser distance meter uses laser light having a wavelength of 650 nm or less.
Another feature of the method for detecting the surface shape of the lining refractory in the molten metal processing vessel of the present invention is that the surface shape of the lining refractory is detected using a plurality of the laser distance meters. is there.
Another feature of the method for detecting the surface shape of the refractory lining the molten metal processing container according to the present invention is that the laser distance meter is used to scan in one direction, and then perpendicular to the one direction. After changing the position in one direction, the scanning in the one direction is repeated.
Another feature of the method for detecting the surface shape of the refractory lining the molten metal processing vessel of the present invention is that the laser distance meter is arranged so as to face the circular opening of the molten metal processing vessel. The laser distance meter is used to scan in a spiral shape around the center of the circular opening or the vicinity thereof.
Another feature of the method for detecting the surface shape of the refractory lining the molten metal processing vessel of the present invention is that the laser distance meter is arranged so as to face the circular opening of the molten metal processing vessel. , Using the laser distance meter to scan in the circumferential direction around the center of the circular opening or the vicinity thereof, and then changing the position to the inside or outside of the circumferential direction, and then the center of the circular opening Alternatively, the scanning in the circumferential direction centering on the vicinity thereof is repeated.
The detection system for the surface shape of the refractory lining the molten metal processing container of the present invention is a system for detecting the surface shape of the refractory lining the molten metal processing container, which detects the surface shape of the refractory lining the molten metal processing container. In the state where the surface temperature of the lining refractory is 700 ° C. or more and 1400 ° C. or less, the frequency range type laser distance meter for measuring the distance to the surface of the lining refractory, and the measurement using the laser distance meter And a shape detecting device for detecting a surface shape of the lining refractory based on distances to a plurality of points on the surface of the lining refractory.
Another feature of the system for detecting the surface shape of the lining refractory of the molten metal processing container of the present invention is that a plurality of the laser rangefinders are arranged in a row, and a row of laser rangefinders arranged in the row. It is in the point which enabled the swing in the direction and the swing in the side with respect to the row direction.
Another feature of the system for detecting the surface shape of the lining refractory of the molten metal processing container of the present invention is that a plurality of the laser rangefinders are arranged in a row, and a row of laser rangefinders arranged in the row. It is in a point enabling swinging in the direction and lateral rotation with respect to the column direction around the point in the column direction.

  According to the present invention, since the distance to the surface of the lining refractory is measured using a frequency domain type laser distance meter, the surface shape of the lining refractory in a high-temperature atmosphere of 700 ° C. to 1400 ° C. Can be accurately detected at low cost.

It is a figure which shows schematic structure of the detection system of the surface shape of the lining refractory of the molten metal processing container which concerns on embodiment. It is a characteristic view which shows the spectral intensity of the emitted light from the black body surface heated at 700 degreeC. It is a characteristic view which shows the spectral intensity of the emitted light from the black body surface heated at 1400 degreeC. It is a figure for demonstrating the process which detects the surface shape of the lining refractory of a molten metal processing container. It is a figure showing an example of composition of a distance measuring device provided with a plurality of laser rangefinders. It is a figure for demonstrating the scanning system of a raster scan type. It is a figure showing an example of composition of a distance measuring device provided with a plurality of laser rangefinders. It is a figure for demonstrating a spiral type scanning system. It is a figure for demonstrating another example of a rotational scanning system.

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
In FIG. 1, schematic structure of the detection system of the surface shape of the lining refractory of the molten metal processing container which concerns on this embodiment is shown.
Reference numeral 1 denotes a frequency range type laser distance meter, which measures the distance to the surface of the lining refractory 3 in a state where the surface temperature of the lining refractory 3 of the molten metal processing container is 700 ° C. or higher and 1400 ° C. or lower.
Reference numeral 2 denotes a shape detection device, which detects the surface shape of the lining refractory 3 based on the distance to a plurality of points on the surface of the lining refractory 3 measured using the laser distance meter 1. The shape detection device 2 is realized by a computer device including a CPU, a ROM, a RAM, and the like, for example.

  The reason why the surface temperature of the lining refractory 3 is in the range of 700 ° C. or more and 1400 ° C. or less is that the molten metal processing container is used so that the surface temperature of the lining refractory 3 does not become less than 700 ° C. That is, when the surface temperature of the lining refractory 3 is less than 700 ° C., when the refractory 3 is reused, when the lining refractory 3 comes into contact with hot metal or molten steel, it may receive a large thermal shock and may cause peeling wear. . On the other hand, the surface temperature of the lining refractory 3 exceeding 1400 ° C. means that the gas generated during the treatment is filled in the molten metal treatment container in a state where time has not passed since the treatment of the molten metal. This is because even if laser light is transmitted, the laser light is scattered by gas molecules constituting the gas and cannot reach the surface of the lining refractory 3, and an accurate distance from the surface of the lining refractory 3 cannot be measured. .

Here, the principle of the frequency domain method is shown. In the laser distance meter 1, 101 is a transmitter, 102 is a semiconductor laser, 103 is a beam splitter, 104 is a reference mirror, 105 is a light receiver, and 106 is a beat frequency analysis circuit.
In the frequency domain method, the frequency of the laser light is changed to a triangular wave shape or a sawtooth wave shape, and the reflected light reflected by the surface of the target object (lined refractory 3) and the reference light generated by the beam splitter 103 and the reference mirror 104 are used. In this method, a beat signal (a beat signal generated by mixing different frequency signals) is generated by interference, and the beat frequency analysis circuit 106 obtains a distance from the frequency of the beat signal. In the frequency domain type laser rangefinder 1, the continuous wave laser beam is a general-purpose laser beam, the number of repeated laser transmissions is on the order of hertz, and the clock speed of the electronic circuit constituting the beat frequency analysis circuit is also in megahertz. Since it is an order, it has a low-priced apparatus configuration.

  In the frequency domain method, it is considered that the distance from the target object in the high-temperature atmosphere can be accurately measured from the principle. The basis for this is that the frequency domain method focuses on measuring the distance from the frequency of the beat signal generated by interference between the reflected light and the reference light. The frequency of the reflected light is a fluctuation of the refractive index in a high-temperature atmosphere. This is because it is not subject to fluctuations.

Further, light having various wavelengths is emitted from the surface of the object heated to a high temperature. Assuming that the object is a black body, the spectral intensity of the wavelength λ in the radiated light from the surface of the black body at the absolute temperature t (K) can be obtained from Equation (1) from Planck's law.
I is the spectral intensity of the wavelength λ in the emitted light from the black body surface at the absolute temperature t (K). h is a Planck's constant, and its value is 6.260755 × 10 ⁻³⁴ (Js). c is the speed of light, and its value is 2.9792458 × 10 ⁸ (m / s). k is a Boltzmann constant, and its value is 1.380658 × 10 ⁻²³ (J / K).

  FIG. 2 shows the spectral intensity of the emitted light from the black body surface heated to 700 ° C., and FIG. 3 shows the spectral intensity of the emitted light from the black body surface heated to 1400 ° C. In each figure, the horizontal axis indicates the wavelength, and the vertical axis indicates the spectrum intensity standard value (a value normalized by setting the maximum value to 1).

  When measuring the distance to a target object in a high-temperature atmosphere using laser light, it is necessary to select a wavelength within a range that is not easily affected by the wavelength of radiation light from the target object. . This is because when the wavelength of the light emitted from the target object is selected as the wavelength of the laser light, since the emitted light from the target object is also detected as a reflected wave, noise increases and an accurate distance cannot be measured.

When measuring the distance to the target object under high temperature using a frequency domain laser rangefinder, the wavelength of the laser beam that is not affected by the radiated light from the target object was experimentally determined.
The experiment was performed as follows. The target object placed in an electric furnace released to the atmosphere and the laser rangefinder were set apart by a certain distance. As the distance, a value measured with a frequency domain laser rangefinder at room temperature was used. The electric furnace is lined with the same material as the target object. The target object placed in the electric furnace is heated to 700 ° C, 800 ° C, 900 ° C, 1000 ° C, 1100 ° C, 1200 ° C, 1300 ° C, and 1400 ° C to release the electric furnace to the atmosphere. After that, at each temperature, the distance between the target object in the electric furnace and the laser distance meter was measured by changing the wavelength of the laser beam in various ways. As the laser light class, those having a wavelength of 700 nm or less were class 2, and those having a wavelength of more than 700 nm were class 1M. Then, the maximum value of the wavelength of the laser beam within which the difference between the distance from the target object measured at room temperature and the distance from the target object measured at each temperature falls within a range of ± 5 mm was set as the upper limit value.

As a result of the experiment, if the surface temperature of the target object is 700 ° C., the wavelength of the laser beam is 1100 nm, 1000 nm if 800 ° C., 900 nm if 900 ° C., 850 nm if 1000 ° C., 750 nm if 1100 ° C., It was found that the upper limit is 700 nm at 1200 ° C., 650 nm at 1300 ° C., and 650 nm at 1400 ° C.
From the above, by using a laser beam having a wavelength of 650 nm or less with a frequency domain laser distance meter, the distance to the lining refractory 3 in a state where the surface temperature is 700 ° C. or more and 1400 ° C. or less is measured. It was proved that the surface shape can be detected.

With reference to FIG. 4, the surface shape of the lining refractory 3 is detected based on the processing by the shape detection device 2, that is, the distance to a plurality of points on the surface of the lining refractory 3 measured using the laser distance meter 1. Processing will be described.
Let (x, y, z) be the coordinates of an arbitrary point P on the surface of the lining refractory 3 when the laser rangefinder 1 is placed at the origin of the three-dimensional space coordinates. Measure position information θ, φ of an arbitrary point P on the surface of the lining refractory 3 with respect to the laser distance meter 1 at the origin, and a distance L from the laser distance meter 1 to an arbitrary point P on the surface of the lining refractory 3 By doing so, the coordinates (x, y, z) of an arbitrary point P can be expressed as in equations (2) to (4) using θ, φ, and L.
x = L cos φ sin θ (2)
y = Lsinφ (3)
z = L cos φ cos θ (4)
Thus, for a plurality of points on the surface of the lining refractory 3, the position information θ, φ of the surface of the lining refractory 3 relative to the laser distance meter 1 at the origin, and the surface of the lining refractory 3 from the laser distance meter 1 By measuring the distance L to this point, the surface shape of the lining refractory 3 can be depicted in a three-dimensional space.
For example, the wear of the lining refractory 3 is obtained by obtaining a difference between the surface shape of the lining refractory 3 of the molten metal processing container before use and the surface shape of the lining refractory 3 of the latest detected molten metal processing container. The amount can be measured continuously. As a result, it is possible to identify a part where wear has remarkably progressed during use, and it is possible to repair only that part during use.

Detection of the surface shape of the lining refractory 3 can be performed by using a single laser distance meter 1 or a plurality of laser distance meters 1.
In the case of hot metal ladle, converter, molten steel pan, tundish, etc. that can visually recognize the entire surface of the refractory 3 lining from the outside among the molten metal processing containers, the laser rangefinder 1 is installed at a fixed point outside the molten metal processing container By doing so, the surface shape of the lining refractory 3 can be detected. In the case of a chaotic vehicle or degassing furnace where the entire surface of the lining refractory 3 cannot be seen from the outside, by installing the laser rangefinder 1 at a fixed point inside so that it can be taken in and out of the molten metal processing vessel, The surface shape of the lining refractory 3 can be detected.

Below, the distance measuring device provided with the laser rangefinder 1 and the example of a scanning system are demonstrated.
In FIG. 5, the structural example of the distance measuring apparatus provided with the several laser distance meter 1 is shown. As shown in FIG. 5, the apparatus has a configuration in which a plurality of laser rangefinders 1 are arranged in a line in a vertical direction in a housing 4. An emission window 5 corresponding to each laser distance meter 1 is formed on the front surface of the housing 4.
A plurality of laser rangefinders 1 are supported by an automatic gonio stage 6 in the housing 4 and can be swung in the vertical direction of the laser rangefinders 1 arranged in a line in the vertical direction, that is, tilt angles (elevation angles and depression angles). Is variable.
Further, the lower part of the housing 4 is supported by the automatic rotation stage 7, and the laser distance meter 1 arranged in a line in the vertical direction can be swung to the left and right sides (horizontal direction), that is, the pan angle is variable.

For example, a plurality of laser rangefinders 1 are arranged so as to face the opening 51 of the molten metal processing vessel 50 placed horizontally (see FIG. 7 described later).
Then, as indicated by an arrow in FIG. 6, the pan angle is first changed by the automatic rotation stage 7 and scanned in one of the horizontal directions by the laser distance meter 1, and then the tilt angle is changed by the automatic goniometer 6. After changing the height position, the pan angle is changed by the automatic rotating stage 7 and the laser distance meter 1 scans in the other horizontal direction (a direction opposite to one direction and parallel). repeat.

FIG. 7 shows another configuration example of a distance measuring device including a plurality of laser distance meters 1. In addition, the same code | symbol is attached | subjected and demonstrated to the structure similar to the apparatus structure shown in FIG. As shown in FIG. 7, the apparatus has a configuration in which a plurality of laser rangefinders 1 are arranged in a line in a housing 4. An emission window 5 corresponding to each laser distance meter 1 is formed on the front surface of the housing 4.
The housing 4 is pivotally supported by the arm 8 on the left and right with respect to the column direction of the laser rangefinder 1. As a result, as shown by an arrow R ₁ , the laser rangefinders 1 arranged in a row can be swung in the row direction using a motor or the like (not shown) as a drive source. In addition, although the structure which pivotally supports the right and left side parts of the housing | casing 4 was demonstrated, it is good also as a structure by which the several laser rangefinder 1 is supported by the automatic goniometer stage 6 in the housing | casing 4 similarly to FIG. .
A rotating shaft 9 is disposed on the back side of the laser distance meter 1. Rotary shaft 9 rotatably supports the arm 8, as shown by the arrow R _2, as a drive source a motor or the like (not shown), the housing 4 is rotatable via arm 8. The rotation center by the rotation shaft 9 is arranged so as to be a point on the laser rangefinder 1 in the column direction, for example, the position of the laser rangefinder 1 in the middle position among the laser rangefinders 1 arranged in a row. As a result, the laser distance meter 1 can be rotated leftward and rightward with respect to the column direction.

As shown in FIG. 7, a plurality of laser rangefinders 1 are arranged so as to face the opening 51 of the molten metal processing vessel 50 placed horizontally. At this time, it is preferable that the rotation center of the rotation shaft 9 is arranged coaxially with the center of the circular opening 51, but it is not necessary to be strictly coaxial, and a plurality of laser distance meters 1 and a molten metal processing container are used. If the positional relationship with 50 is clear, it may be shifted from the same axis. However, the distance of the deviation between the center of rotation and the center of the circular opening 51 is preferably about twice or less the length of the plurality of laser distance meters 1 shown in FIG. 7 arranged in the vertical direction. .
Then, as indicated by the arrow in FIG. 8, while the laser distance meter 1 is rotated by the rotation shaft 9 (rotation R ₂ ), the laser distance meter 1 is swung in the column direction (rotation R ₁ ) to thereby adjust the laser distance. By gradually changing the depression angle of the total 1, scanning is performed in a spiral shape around the center of the circular opening 51 or the vicinity thereof. In FIG. 8, an example of scanning from the outer peripheral side toward the center is illustrated, but the laser rangefinder 1 is swung in the column direction while rotating the laser rangefinder 1 with the rotation shaft 9 (rotation R ₂ ). by varying (rotation R ₁₎ was added slowly elevation of the laser rangefinder 1 may be scanned toward the outer periphery from the center side.

Here, in the case of the raster scan type scanning method described with reference to FIGS. 5 and 6, since the circular opening 51 is scanned in the horizontal direction and the vertical direction, an area 52 outside the molten metal processing vessel 50 is present in the scanning area. Will be included. The region 52 is a region that is not necessary for detecting the surface shape of the lining refractory 3, and it takes time to measure the distance by scanning the region.
Further, when the pan angle is changed and the scanning position (position at which the distance is measured by the laser rangefinder 1) moves inward from the opening edge 53 of the molten metal processing vessel 50 (such as the portion 54 shown in FIG. 6). The distance change amount may become large. Similarly, when the tilt angle is changed, the distance change amount may become large. Some laser rangefinders have a calibration function, and when the distance to be measured changes significantly with respect to the scanning amount, there are some that are not adopted as measurement data due to other factors. In this case, missing measurement data occurs at the location 54 and the like, and the measurement performance of the surface shape of the lining refractory 3 may be degraded due to a decrease in the measurement data. If the change in pan angle and tilt angle is small, missing measurement data can be suppressed, but the scanning speed is reduced, and time is required for distance measurement.

On the other hand, in the case of the spiral scanning method described with reference to FIGS. 7 and 8, since scanning is performed from the outer peripheral side to the center along the circular opening 51 or vice versa, the molten metal is formed in the scanning region. The region 52 outside the processing container 50 can be prevented from being included. Therefore, distance measurement can be performed in a short time. When comparing the same object, it was found that the distance measurement was about 10 minutes in the raster scan type, but about 3 minutes in the spiral type.
In addition, when the scanning position moves from the opening edge 53 to the inside, it gradually moves to a deeper position of the molten metal processing vessel 50, so that the distance change amount can be prevented from becoming large. Thereby, lack of data does not occur, and it can be avoided that the detection performance of the surface shape of the lining refractory 3 is inferior.

Further, by using the distance measuring device shown in FIG. 7, it is possible to adopt a rotational scanning method as shown in FIG. 9 instead of the spiral scanning method.
As shown in FIG. 7, a plurality of laser rangefinders 1 are arranged so as to face the opening 51 of the molten metal processing vessel 50 placed horizontally. At this time, it is preferable that the rotation center of the rotation shaft 9 is arranged coaxially with the center of the circular opening 51, but it is not necessary to be strictly coaxial, and a plurality of laser distance meters 1 and a molten metal processing container are used. If the positional relationship with 50 is clear, it may be shifted from the same axis. However, the distance of the deviation between the center of rotation and the center of the circular opening 51 is preferably about twice or less the length of the plurality of laser distance meters 1 shown in FIG. 7 arranged in the vertical direction. .
Then, as shown in FIG. 9, the laser distance meter 1 is rotated by the rotating shaft 9 (rotation R ₂ ), and scanning is performed in the circumferential direction around the center of the circular opening or the vicinity thereof. The position of the laser rangefinder 1 is changed by adding a heading (rotation R ₁ ) in the row direction of the total 1 to change the position inside the circumferential direction, and then the laser rangefinder 1 is rotated by the rotary shaft 9 (Rotation R ₂ ) and repeat scanning in the circumferential direction. In FIG. 9, an example of scanning from the outer peripheral side toward the center is illustrated, but after scanning in the circumferential direction, the elevation angle of the laser rangefinder 1 is changed to scan from the central side toward the outer periphery. May be.

In the case of the rotary scanning method described with reference to FIGS. 7 and 9, the distance measurement is performed for a short time so that the region 52 outside the molten metal processing vessel 50 is not included in the scanning region, similarly to the spiral scanning method. Can be done. Further, it is possible to prevent the distance change amount from increasing, prevent data from being lost, and prevent the detection performance of the surface shape of the lining refractory 3 from being deteriorated.
Further, the rotation method has an advantage that the rotation control and the swing control of the laser rangefinder 1 are relatively simple.
In the spiral scanning method and the rotational scanning method, the rotation by the rotation shaft 9 (arrow R ₂ ) is not limited to one direction, but may be reversed every 360 °, for example.

(Example)
As an embodiment, an example in which the surface shape of the lining refractory 3 is detected using a plurality of laser distance meters 1 will be described. Since the frequency range type laser rangefinder 1 can be configured with an inexpensive apparatus, a plurality of laser rangefinders 1 can be practically used. Then, the distances measured by the plurality of laser rangefinders 1 are processed in parallel by the shape detection device 2, so that the detection of the surface shape of the lining refractory 3 can be speeded up.

In the present embodiment, as shown in FIG. 5, the apparatus has a configuration in which 10 laser rangefinders 1 are arranged in the casing 4 at equal intervals of 50 mm in the vertical direction. The laser light employed in the laser rangefinder 1 is class 2 and has a wavelength of 650 nm.
Targeting a molten steel pan which is one of the molten metal processing containers, the apparatus is fixed to the outside of the molten steel pan, and the points on the surface of the refractory 3 of the lining of the molten steel pan are spaced at equal intervals of 50 mm and laser distance meters. 1 is measured, and the surface shape of the lining refractory 3 is detected.
The bottom laser rangefinder 1 was fixed outside the molten steel pan so as to be the origin of the three-dimensional spatial coordinates.
Further, in order to scan at an equal interval of 50 mm, a plurality of laser distance meters 1 are supported by an automatic goniostage 6 and the housing 4 is supported by an automatic rotation stage 7. The automatic gonio stage 6 is for scanning in the vertical direction by the laser distance meter 1, and the automatic rotation stage 7 is for scanning in the horizontal direction by the laser distance meter 1. As described above, for example, first, the pan angle is changed by the automatic rotating stage 7 and scanning is performed in one of the horizontal directions by the laser distance meter 1, and then the tilt angle is changed by the automatic goniometer 6 and the height position is changed. After changing the above, the pan angle is changed by the automatic rotating stage 7 and the laser distance meter 1 repeats scanning in the other horizontal direction (a direction opposite to the one direction and parallel).

A process for detecting the surface shape of the lining refractory 3 based on the distance to a plurality of points on the surface of the lining refractory 3 measured using a plurality of laser distance meters 1 will be described.
By positioning the lowest laser rangefinder 1 at the origin of the three-dimensional spatial coordinates, the position information θ, φ of any point on the surface of the lining refractory 3 is measured by the automatic gonio stage 6 and the automatic rotation stage 7. can do.
The automatic rotation stage 7 is moved in the horizontal direction by an angle θ, and the automatic goniometer stage 6 is moved in the vertical direction by an angle φ, and the lowest stage (origin) is N = 1, where N is from 2 to 10 in order of increasing distance from the lowest stage. It is assumed that a point on the surface of the lining refractory 3 at a distance Lmm is measured using a laser distance meter 1 of (natural number). The coordinates (x, y, z) of the point can be expressed as in equations (5) to (7) using θ, φ, L and the installation distance of the laser distance meter 1 of 50 mm.
x = L cos φ sin θ-50 (N−1) sin φ sin θ (5)
y = Lsinφ + 50 (N−1) cosφ (6)
z = L cos φ cos θ-50 (N−1) sin φ sin θ (7)
Thus, for a plurality of points on the surface of the lining refractory 3, the position information θ, φ of the surface of the lining refractory 3 relative to the laser distance meter 1 at the origin, and the surface of the lining refractory 3 from the laser distance meter 1 By measuring the distance L to this point, the surface shape of the lining refractory 3 can be depicted in a three-dimensional space.

Although the present invention has been described together with the embodiments, the above-described embodiments are merely examples of implementation in carrying out the present invention, and the technical scope of the present invention is interpreted in a limited manner by these. It must not be. That is, the present invention can be implemented in various forms without departing from the technical idea or the main features thereof.
For example, the configuration of the apparatus shown in FIGS. 5 and 7 is an example, and if the raster scan type scanning method described in FIG. 6 or the spiral type scan described in FIG. It is not limited. For example, in the apparatus configuration shown in FIGS. 5 and 7, it is not necessary to be able to swing in both the elevation angle and depression directions, and it may be configured to swing in only one direction.

  1: frequency range type laser rangefinder, 2: shape detector, 3: refractory lining of molten metal processing vessel, 4: housing, 5: exit window, 6: automatic gonio stage, 7: automatic rotating stage, 8 Arm, 9: Rotating shaft

Claims (9)

A method for detecting a surface shape of a lining refractory of a molten metal processing container, which detects a surface shape of a lining refractory of a molten metal processing container,
In the state where the surface temperature of the lining refractory is 700 ° C. or more and 1400 ° C. or less, the distance to a plurality of points on the surface of the lining refractory is measured by using a frequency range type laser distance meter. A method for detecting a surface shape of a lining refractory of a molten metal processing container, characterized by detecting a surface shape of the molten metal.   The method for detecting a surface shape of a lining refractory of a molten metal processing container according to claim 1, wherein the laser distance meter uses a laser beam having a wavelength of 650 nm or less.   The surface shape of the lining refractory of the molten metal processing container according to claim 1 or 2, wherein the surface shape of the lining refractory is detected using a plurality of the laser distance meters.   4. The method according to claim 1, wherein scanning is performed in one direction using the laser distance meter, and then scanning in the one direction is repeated after changing a position in a direction perpendicular to the one direction. The method for detecting the surface shape of the lining refractory of the molten metal processing container according to any one of the above. The laser distance meter is disposed so as to face the circular opening of the molten metal processing vessel,
The lining of the molten metal processing container according to any one of claims 1 to 3, wherein the laser distance meter is used to scan in a spiral shape around the center of the circular opening or the vicinity thereof. Refractory surface shape detection method. The laser distance meter is disposed so as to face the circular opening of the molten metal processing vessel,
The laser distance meter is used to scan in the circumferential direction around the center of the circular opening or the vicinity thereof, and then change the position to the inside or outside of the circumferential direction, and then the center of the circular opening or The method for detecting the surface shape of the lining refractory of a molten metal processing container according to any one of claims 1 to 3, wherein scanning in the circumferential direction centering on the vicinity thereof is repeated. A detection system for detecting the surface shape of a refractory lining a molten metal processing vessel, the surface shape of a refractory lining a molten metal processing vessel,
A frequency range type laser rangefinder that measures the distance to the surface of the lining refractory in a state where the surface temperature of the lining refractory is 700 ° C. or higher and 1400 ° C. or lower;
A molten metal treatment comprising: a shape detection device that detects a surface shape of the lining refractory based on a distance to a plurality of points on the surface of the lining refractory measured using the laser distance meter Detection system for surface shape of refractories lining containers. Arrange multiple laser rangefinders in a row,
The molten metal processing container according to claim 7, wherein the laser rangefinders arranged in a row can swing in a row direction and swing in a lateral direction with respect to the row direction. Detection system for surface shape of lining refractories. Arrange multiple laser rangefinders in a row,
The laser rangefinders arranged in a row can be swung in a row direction and rotated in a lateral direction with respect to the row direction around a point on the row direction. Item 8. A system for detecting a surface shape of a lining refractory of a molten metal processing container according to Item 7.

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