JPS61134612A - Method and device for measuring intra-furnace shape - Google Patents

Abstract

PURPOSE:To detect accurately the residual thickness of refractories or the like by calculating the position of a laser beam bright point in accordance with the principle of triangulation and obtaining an intra-furnace shape on a basis of the position of the detected laser beam bright point while rotating and moving a measuring lance. CONSTITUTION:A measuring lance 12 is allowed to fall by a driving part 18, and its T-shaped front end part 12A is set to a position near a furnace wall bottom surface 10C, and a laser beam 22 is projected from a light projector 23 at a projection angle alpha to the furnace wall bottom surface 10C. A bright point 24A on the furnace wall bottom surface 10C is sent to an ITV 30 from a photodetector to obtain a video signal, and this signal is inputted to a minicomputer 34 to store the position of the bright point. This operation is repeated while rotating and raising the measuring lace 12 to scan the furnace wall bottom surface 10C and a furnace wall side surface 10B, and bright point image positions, lance rotation angles beta, and lance moving displacements D in position where measurement is necessary are inputted to the minicomputer 34. Coordinates of individual points of the intra-furnace profile obtained in this manner are obtained in accordance with the principle of triangulation on a basis of position coordinates of the light projector 23 and the photodetector 28, light projection angles alpha, lance rotation angle beta, a photodetector azimuth gamma, and position coordinates N of an optical image.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a method and apparatus for measuring the shape inside a furnace, and in particular,
It is suitable for measuring the state of wear and tear on the refractory lining of furnaces mainly used for steel making, such as converters, mixer furnaces, and steel tapping furnaces. The present invention relates to an improved method and apparatus for measuring the shape of a furnace in a non-contact manner.

[Background Art] Generally, the life of a converter is determined by the wear and tear of the refractory lining, and in recent years, along with the development of inner wall repair technology, technology has been developed to quickly and accurately measure the state of wear and tear on the refractory after tapping. is required. That is, in recent years, due to an increase in the continuous casting ratio, etc., steel tapping from a converter is required to match the pouring time, and a situation has arisen in which spraying does not allow enough time for repairs. As a result, the period of thin-wall operation has become longer, creating many problems and risks. Therefore, conventionally, for example, a method using a laser rangefinder made by AGA Geotronics (Sweden) or a method using a "refractory 1
A method using a microwave rangefinder is proposed, as reported in 983 No. 1J, pages 34 to 35.

[Problems to be solved by the invention]
] However, the method using the laser rangefinder has 1
Since the time required to measure the position of a point is as long as 8 seconds, it takes 30 to 60 minutes or more just to obtain a local profile, and it is difficult to perform frequent measurements. Furthermore, since the measurement was performed from outside the furnace, the measurement area was limited and measurement near the furnace mouth was difficult. In addition, since the method using the microwave rangefinder uses microwaves, the beam diameter is as large as 200nφ, making it difficult to satisfy the required position accuracy of 50 days. Since the furnace is installed at a right angle, it is difficult to measure the bottom of the furnace. In order to solve such problems, for example,
115160 and Japanese Patent Application No. 58-153193, a measuring lance is inserted into the converter immediately after steel is tapped, and a laser beam is used by a light emitting part and a light receiving part attached to the tip of the measuring lance. Attempts have been made to measure the inner shape of refractory linings based on the principle of so-called triangulation. However, even in this method, conventionally, as shown in FIG. 3, a light emitting part 14 and a light receiving part 16 are attached to the tip of the measuring lance 12 inserted into the converter 10 from the furnace mouth 10A. Because they were installed in parallel toward the copper surface 10B, the furnace bottom 10
It was difficult to accurately detect the shape of G.

[Purpose of the invention]

The present invention was made in order to solve the above-mentioned conventional problems, and it is possible to measure the shape of the furnace including the bottom of the furnace with high precision and quickly. It is an object of the present invention to provide a method and apparatus for measuring the shape of the inside of a furnace, which can accurately detect the shape of the inside of a furnace.

[Means to solve the problem]

The present invention provides a method for measuring the shape of the inside of a furnace in a non-contact manner from the position of a bright spot of a laser beam projected into the furnace, in which a light projecting means and a light receiving means are directed toward the bottom of the furnace wall. When the measurement lances, which are arranged in parallel to each other and are rotatable around the shaft and movable in the axial direction, are inserted into the furnace from the furnace mouth, and the laser beam is projected into the furnace at a set angle from the projection means. detecting a bright spot of the laser beam through the light receiving means by the working means, calculating the position of the bright spot of the laser beam by the principle of triangulation, and rotating the measuring lance;
Furthermore, the above object is achieved by determining the shape of the furnace interior from the position of the laser beam bright spot detected while moving. The present invention also provides a measuring device having a similar shape inside the furnace, including a hollow measuring lance that is inserted into the furnace from the furnace mouth and is rotatable around an axis and movable in the axial direction; a lance driving means for moving the measuring lance; a lance position detecting means for detecting the rotation angle and movement displacement of the measuring lance; a laser light source for generating a laser beam outside the furnace; placed towards the bottom,
a projection means for projecting a laser beam into the furnace at a set angle;
a laser beam transmission means for transmitting a laser beam generated by the laser light source to the light projection means through the inside of the measurement lance; and a furnace wall disposed at the tip of the measurement lance alongside the light projection means. a light-receiving means for obtaining an optical image inside the furnace with a field of view including a laser beam bright spot from the light projecting means, which is disposed toward the bottom surface; and an imaging device for capturing the optical image obtained by the light-receiving means outside the furnace. a means for transmitting an optical image obtained by the light receiving means to the m-image means through the inside of the measuring lance; a position of a laser beam bright spot on the imaging means; The above object is also achieved by providing a signal processing means for calculating the shape of the furnace interior based on the rotation angle and movement displacement of the reactor based on the principle of triangulation.

[Effect]

In the present invention, the light emitting means and the light receiving means arranged in the measuring lance are arranged side by side at the tip facing the bottom of the furnace wall, so the shape of the inside of the furnace including the bottom of the furnace wall can be determined with high precision. Moreover, it becomes possible to measure quickly.

【Example】

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a converter internal shape measuring device to which the present invention is applied will be described in detail with reference to the drawings. As shown in FIGS. 1 and 2, this embodiment includes a measuring lance 12 that is inserted into the furnace from the furnace mouth 10A of the converter 10 and is rotatable around the central axis and movable in the axial direction. A lance drive unit 18 disposed directly above the converter 10 for rotating and moving the measuring lance 12, and a lance position detector for detecting the rotation angle β and displacement of the measuring lance 12. 20, a laser light source 22 (FIG. 2) that generates a laser beam outside the furnace, and a laser beam disposed at one end of the T-shaped tip 12A of the measuring lance 12 toward the bottom surface 10C of the furnace wall. 24 into the furnace at a set angle α (FIG. 2), and the laser beam generated by the laser light source 22 is passed through the inside of the measurement lance 12.
An optical transmission fiber 27 (FIG. 2) that transmits data to the projector 23 and an optical transmission fiber 27 (FIG. 2) arranged at the other end of the T-shaped tip 12A of the measuring lance 12, along with the projector 23, are arranged toward the bottom surface 10G of the furnace wall. , a laser beam bright spot 24 from the projector 23
Does it include A? l! ! A photodetector 28 that obtains an optical image inside the furnace using the F28A, and an industrial television camera (hereinafter referred to as ITV) that captures the optical image obtained by the photodetector 28 directly above the converter 10.
) 30 (FIG. 2), and an image transmission fiber 32 that transmits the optical image obtained by the light receiver 28 to the ITV 30 through the interior of the measurement lance 12.
(Fig. 2), the position of the laser beam bright spot 24A on the screen of the ITV 30, the rotation angle β and the movement displacement of the measuring lance 12, and the mini-computer 34 ( (Fig. 2). In FIG. 1, 21 is a storage section for the laser light source 22, 26 is a storage pipe for the optical transmission fiber 27, and 29
36 is a purge gas supply pipe, 38 is a cooling water supply pipe, and 40 is a drain pipe. Further, in FIG. 2, 42 is an external output terminal for outputting the output video signal of the rTV 30, the lance rotation angle signal and the lance movement displacement signal output from the lance position detector 20, and 44 is a purge terminal. The gas passage 46 for
The cooling water supply passage 48 is also a drainage passage. The projector 23 has a built-in lens system for preventing the laser beam 24 from diffusing. Further, the light receiver 28 has a built-in lens system for obtaining an optical image. Furthermore, the rTV 30 includes an optical filter that transmits only the wavelength of the laser beam. The operation of the embodiment will be explained below. At the start of measurement, the measuring lance 12 is lowered by the lance drive unit 18 and initially set to a fixed position such that its T-shaped tip 12A is located near the bottom surface 10C of the furnace wall. Next, the laser beam [22 is turned on, a laser beam is generated from the laser light source 22, transmitted to the projector 23 through the optical transmission fiber 27, and projected onto the furnace wall bottom surface 10G at the set projection angle α shown in FIG. do. Next, as shown in FIG. 1, the laser beam bright spot 24A on the bottom surface 10C of the furnace wall is inputted by the light receiver 28 and transmitted to the ITV 30 by the image transmission fiber 32.
Obtain video signal with ITV30. This video signal is input to the minicomputer 34 via the external output terminal 42, and the bright spot image position on the ITV 30 is detected and stored. By performing the above operations while rotating and raising the measuring lance 12, the entire bottom surface 10C of the furnace wall and the side surface 1
0B is scanned, and the bright spot image position, lance rotation angle β, and lance movement displacement at the point where measurement is required are input into the minicomputer 34. In this way, the coordinates of each point in the furnace profile are the positional coordinates of the emitter 23 and the receiver 28, the projection angle α, the lance rotation angle β, the receiver direction angle γ, and the position of the optical image t! From mark N, it is completely determined based on the principle of triangulation. According to this embodiment, the measurement point position It accuracy is ±1 On. Accuracy in refractory thickness direction ±5m, small data rR5ms/point (20 seconds/4000 points), calculation time 20 seconds/4
000 points, it was possible to calculate 4000 BuO fill points. In the above embodiments, the present invention was applied to the measurement of the shape inside a converter, but the scope of application of the present invention is not limited to this, and can also be applied to general melting furnaces such as mixed iron furnaces and electric furnaces. , it is possible to similarly apply it to the O-fill measurement of refractories, etc.

【Effect of the invention】

As explained above, according to the present invention, the shape of the inside of the furnace including the bottom of the furnace can be measured quickly and with high accuracy. Therefore, it has an excellent effect of being able to accurately detect the remaining thickness of the refractory material, areas requiring repair, etc.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the overall configuration of an embodiment of a converter internal shape measuring device in which the furnace internal shape measuring method according to the present invention is adopted, and FIG. 2 is a main part configuration of the embodiment. The third factor is a cross-sectional view showing the arrangement of a light projecting part and a light receiving part in a measurement lance used in the conventional measurement of the worn shape of a furnace lining refractory. 10... Converter, 10A... Furnace mouth, 1
oC... bottom of furnace wall, 12... measurement lance, 12A... tip, 18... lance drive section, 20... lance position detector, β... lance rotation angle, D...・Movement displacement,
22... Laser light source, 23... Floodlight,
24... Laser beam, α... Projection angle,
24A... Laser beam bright spot, 27... Optical transmission fiber, 28... Light receiver, 2
8A...Field of view, 30...Industrial television camera (ITV>, 32...
Image transmission fiber, 34...Mini computer.

Claims (2)

[Claims] (1) From the position of the bright spot of the laser beam projected into the furnace,
In a method for measuring the shape of the inside of a furnace in a non-contact manner, the light emitting means and the light receiving means are arranged in parallel at the tip toward the bottom of the furnace wall, are rotatable around an axis, and are movable in the axial direction. A flexible measuring lance is inserted into the furnace from the furnace mouth, and when a laser beam is projected into the furnace from the light projecting means at a set angle, a laser beam bright spot is detected by the imaging means via the light receiving means. The position of the laser beam bright spot is calculated by the principle of triangulation, and the shape of the furnace interior is determined from the position of the laser beam bright spot detected while rotating and moving the measuring lance. Characteristic method for measuring the shape inside the furnace. (2) From the position of the bright spot of the laser beam projected into the furnace,
A furnace internal shape measuring device that measures the internal shape of the furnace in a non-contact manner includes: a hollow measuring lance that is inserted into the furnace from the furnace mouth and is rotatable around an axis and movable in the axial direction; lance driving means for rotating and moving the measuring lance; lance position detecting means for detecting the rotation angle and movement displacement of the measuring lance; a laser light source that generates a laser beam outside the furnace; a light projecting means disposed toward the bottom of the furnace wall and projecting a laser beam into the furnace at a set angle; and a light projecting means for projecting a laser beam into the furnace at a set angle; a laser beam transmitting means for transmitting a laser beam to the means; and a laser beam transmission means disposed at the tip of the measuring lance facing the bottom of the furnace wall in line with the light projecting means, the furnace having a field of view including a laser beam bright spot from the light projecting means. a light receiving means for capturing an optical image of the inside of the measuring lance; an imaging means for capturing an optical image obtained by the light receiving means outside the furnace; and a light receiving means for capturing an optical image of the inside of the measuring lance an image transmission means for transmitting the image to the imaging means through the imaging means; and a signal for calculating the shape of the furnace interior based on the principle of triangulation from the position of the laser beam bright spot on the imaging means, the rotation angle and the movement displacement of the measuring lance. A furnace shape measuring device characterized by comprising: a processing means;