JP2018185253A - Converter refractory profile measuring apparatus and converter refractory profile measuring method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a converter refractory profile measuring device and a measuring method which reduce the cycle time interruption of converter refining and do not require a reference point to be provided in the converter. SOLUTION: A converter refractory profile measuring device 1 takes an image in a two-dimensional imaging range and a gantry 2 fixed to a building structure 22 on the side where the converter opening is tilted (further back side 32) at the time of steelmaking. A shape measuring device (profile meter 8) for measuring the distance to the target and a moving device 3 connected to the gantry 2 for moving the profile meter 8 between the forward position 33 and the backward position 34. The forward position 33 is a part of the refractory furnace inner surface 17 shape in the converter through the furnace opening 11 by the profile meter 8 when the furnace opening 12 of the converter 11 is tilted to the back side 32. Alternatively, it is a position where all can be observed, and the forward position 33 is a position where the distance between the profile meter 8 and the furnace port 11 is closer than the backward position 34. [Selection diagram] Fig. 1

Description

  The present invention relates to a converter refractory profile measuring device and a converter refractory profile measuring method for measuring a refractory furnace inner surface shape (refractory profile) of a converter.

  In a converter for refining molten metal including molten iron, a refractory is lined in a vessel formed of iron skin and having a furnace opening at the top of the furnace, and is provided to be tiltable about a tilting axis. In the refining of molten iron, first, hot metal and scrap are charged from the furnace port. The converter furnace port is tilted to the hot metal charging side (hereinafter referred to as the “furnace front side”), and scrap from the scrap chute and hot metal from the hot metal ladle are all charged into the furnace via the furnace port. Next, pure oxygen top blowing refining is performed with the furnace upright (position where the furnace port is directly above). Bottom blowing is also performed in the top-bottom blowing converter. When the refining is completed, the converter is tilted to the opposite side to the front side of the furnace, and the molten steel is discharged through a steel outlet provided in the converter belly. The side on which the converter furnace tilts during steel output is called the furnace side. One cycle from the charging of raw materials (scraps and hot metal), through acid feed refining (blowing), to steel output and waste is called “heat” here.

  During the refining of the converter, in order to refine and remove impurities in the molten iron, molten slag is formed on the surface of the molten iron, and the molten iron is vigorously stirred by blowing oxygen. In the top-bottom blowing converter, a bottom blowing tuyere is provided at the bottom of the furnace. The refractory built in the converter furnace is exposed to the high temperature of the molten iron being stirred, and the surface is worn out by reaction with the molten slag formed, and the refractory near the bottom blowing tuyere is caused by bottom blowing. As a result, wear proceeds.

  The lining refractory of a converter is generally constructed with two layers of permanent bricks close to the iron skin and wear bricks inside the furnace. When wear of the wear brick progresses, the wear brick is finally replaced entirely. When the refractory wear is progressing locally, the wear is repaired by spraying the sprayed refractory on the portion where the wear has progressed. If it is possible to accurately grasp the part of the refractory furnace inner surface where wear has progressed and the amount of wear, it is possible to secure the thickness of the refractory by spraying the part and cause local wear. As a result, it is possible to investigate the permanent measures and extend the refractory life of the converter.

  Patent Document 1 discloses a method of imaging a refractory including a reference point in a converter and calculating a profile of the refractory. The imaging is to capture a plurality of images with different shooting angles with respect to the same object (3D camera), and can be called a so-called stereo photography system. In this document, a digital 3D camera is installed in the vicinity of the converter using a tripod. Three reference points are provided in the vicinity of the converter mouth of the converter, and three-dimensional coordinates are determined based on the reference points, thereby matching profiles taken at different timings. Further, in Patent Document 2, there is a method for measuring the remaining thickness of the wear layer in the molten metal container, in which the position information of the permanent layer is measured in advance and the position information of the wear layer is measured and measured in advance. And determining the remaining thickness of the wear layer by comparing with the perm layer position information. Laser distance meters are used as position information measuring means.

JP 2009-68982 A JP 2014-142152 A

  In converter refining, molten steel production is performed by repeating the cycle (heat) of raw material charging, blow smelting, tapping and discharging. In order to ensure the soundness of the converter lining refractory and maintain the refractory life, it is preferable to measure the refractory profile at as many timings as possible. Most preferably, refractory profile measurements can be made once for each heat. On the other hand, when it is requested to maximize the production amount of molten steel, it is not preferable to interrupt the production of the converter for the refractory profile measurement.

  In contrast, in the method described in Patent Document 1, the 3D camera is installed at a predetermined position using a tripod, and the converter is tilted so that the 3D camera can photograph the inside of the furnace through the furnace port of the converter, It is necessary to perform imaging. For this reason, it is essential to interrupt the operation of the converter for the refractory profile measurement, which has been a factor in reducing the productivity of the converter.

  Conventionally, since the relative position and relative angle between the converter and the 3D camera fluctuate at each measurement timing, three reference points are provided near the furnace mouth of the converter, and three-dimensional coordinates are based on the reference points. It was essential to establish In the vicinity of the converter mouth, slag and metal are likely to adhere due to slag blowing during blowing, and it may be difficult to maintain a reference point that can be always recognized by a 3D camera.

  The present invention provides a converter refractory profile measuring apparatus and a converter refractory profile measuring method that eliminates or minimizes the interruption of converter refining cycle time and eliminates the need to provide a reference point near the converter furnace entrance. The purpose is to do.

That is, the gist of the present invention is as follows.
(1) A device for measuring a refractory furnace inner surface shape (hereinafter referred to as “refractory profile”) of a converter,
The stand fixed to the building structure on the side where the converter furnace tilts when steel is output from the converter (hereinafter referred to as the “furnace side”), and the distance to the imaging target in each imaging region of the two-dimensional imaging range A shape measuring device (hereinafter referred to as a “profile meter”) that can measure the position, and a moving device connected to the gantry, the moving device moving the profile meter between a forward position and a backward position; Have
The forward position is a position at which part or all of the refractory furnace inner surface shape in the converter furnace can be observed through the furnace port by the profile meter when the furnace port of the converter is tilted to the furnace back side. The converter refractory profile measuring device, wherein the forward position is a position where the distance between the profile meter and the furnace port is closer than the backward position.
(2) The retreat position is a position where a part of the refractory furnace inner surface shape in the converter furnace can be observed through the furnace port by the profile meter when the furnace port of the converter is tilted to the furnace back side. The converter refractory profile measuring device according to (1) above, wherein
(3) A converter refractory profile measuring method using the converter refractory profile measuring device according to (1) or (2) above,
At two different timings, the converter throat is tilted to the back of the furnace, and the refractory profile of the converter is measured using the profile meter at one or both of the forward position and the backward position. A method of measuring a refractory profile of a converter, comprising evaluating a thickness increase / decrease amount of the refractory between two timings by comparing the refractory profiles.

  According to the converter refractory profile measuring apparatus and the converter refractory profile measuring method of the present invention, the converter refining cycle time is eliminated or reduced as much as possible, and a converter is provided without providing a reference point near the converter furnace opening. The refractory furnace inner surface shape (refractory profile) can be measured.

It is a side view which shows the positional relationship of the converter refractory profile measuring apparatus of this invention, and a converter. It is side surface sectional drawing which shows the positional relationship of the converter refractory profile measuring apparatus of this invention, and a converter, and shows the case where a profile meter exists in an advance position (A) and a retreat position (B). It is a figure which shows the arm position in the converter refractory profile measuring apparatus of this invention, (A) is a side view, (B) is a BB arrow front view. It is a figure which shows the arm position in the converter refractory profile measuring apparatus of this invention, (A) is a side view, (B) is a BB arrow front view. It is a figure which shows the positional relationship of the converter refractory profile measuring apparatus of this invention, and peripheral equipment, (A) is a side view, (B) is a front view. It is side surface sectional drawing which shows the measurement condition of the refractory profile using the converter refractory profile measuring apparatus of this invention, and shows the case where a profile meter exists in an advance position (A) and a retreat position (B).

The present invention will be described with reference to FIGS.
When measuring the shape (refractory profile) of the refractory furnace inner surface 17 of the converter 11, the present invention can measure the distance to the imaging target at each imaging part in the two-dimensional imaging range. (Profile meter 8) is used.

  A vertical axis when the converter 11 is upright is called a furnace axis 18. The normal converter 11 has a shape in which a concentric circle centered on the furnace shaft 18 is drawn in a cross section perpendicular to the furnace shaft 18. The converter 11 is provided so as to be tiltable around the tilting shaft 19. The furnace shaft 18 and the tilt shaft 19 are provided at right angles to each other. The intersection of the furnace shaft 18 and the tilting shaft 19 is called a furnace body origin 39.

  In the building, a floor is provided around the converter 11 at substantially the same height as the tilting shaft 19, and is called a hearth 21 here. For the side (furnace front side 31) where the converter 11 is tilted and the scrap or hot metal is charged, the hot metal ladle containing the hot metal is lifted with an overhead crane and the hot metal is charged into the converter from the hot metal ladle. Therefore, the hearth 21 on the furnace front side 31 is a wide space, and a high space is secured even above the hearth to the overhead crane traveling position. On the other hand, on the side where the molten steel is produced by tilting the converter furnace port (furnace side 32), the floor structure of the ceiling and the next floor is formed immediately above the hearth 21 to form the building structure 22. doing. When the converter is tilted by 90 ° toward the furnace side 32, the furnace shaft 18 of the converter 11 is normally disposed at a position slightly higher than the hearth 21 and is positioned parallel to the hearth 21. An angle between the furnace shaft 18 and the perpendicular is a converter tilting angle θ. The converter tilt angle θ when the converter 11 tilts to the furnace side is a positive value.

  The present invention provides a gantry 2 fixed to a building structure 22 on the furnace side 32 and a moving device 3 connected to the gantry 2 when the profile meter 8 for measuring the refractory profile of the converter is arranged. And a moving device 3 for moving the profile meter 8 between the forward movement position 33 and the backward movement position 34. As the building structure 22 for fixing the gantry 2, a steel structure portion of a portion that becomes a ceiling position when viewed from the hearth 21 on the furnace side 32 can be used. As the moving device 3 disposed between the gantry 2 and the profile meter 8, for example, a mechanism in which the movable trolley 5 linearly advances and retreats on the rail 4 provided on the gantry 2 side can be adopted. An arm 7 is provided on the movable carriage 5, and a profile meter 8 can be disposed at the tip of the arm 7. By moving the movable carriage 5 forward and backward on the rail 4, the profile meter 8 can be disposed at each of the forward movement position 33 and the backward movement position 34. In FIG. 1, the forward position 33 is indicated by a solid line, and the backward position 34 is indicated by a two-dot chain line. In this way, since the gantry 2 fixed to the building structure 22 is used and the gantry 2 and the profile meter 8 are connected by the moving device 3, the profile meter 8 is always the same in both the forward position 33 and the backward position 34. It is possible to stop at a precise position.

  With reference to FIGS. 1 and 2A, the advance position 33, which is the arrangement position of the profile meter 8, will be described. The refractory furnace inner surface shape in the normal converter cross section is formed from the furnace bottom part 13, the cylindrical furnace belly part 14, and the furnace upper part 15 that narrows toward the furnace port 12. When observing the inside of the furnace with the profile meter 8 from the outside of the furnace port 12, if the distance from the profile meter 8 to the furnace port 12 is too far, the refractory furnace inner surface 17 of the upper part 15 of the furnace is hidden behind the furnace port 12 and observed. Can not do it. Further, when the distance from the furnace port 12 is increased, the refractory furnace inner surface 17 of the furnace belly part 14 is also hidden behind the furnace port 12 and cannot be seen. Therefore, in order to observe the refractory furnace inner surface 17 of the furnace upper part 15 at the advance position 33 of the profile meter 8, it is necessary to place the profile meter 8 as close to the furnace port 12 as possible.

  When the converter 11 is tilted 90 ° toward the hearth side (θ = 90 °) (hereinafter referred to as “90 ° tilt position 38”), the profile in the direction of the furnace shaft 18 extending horizontally in parallel with the hearth 21 It is preferable to determine the advance position 33 so that the meter 8 is arranged. Further, as described above, it is preferable that the profile meter 8 is as close as possible to the furnace port 12 at the forward movement position 33. A protective wall 23 is provided between the hearth upper space on the furnace side 32 and the converter. The protective wall 23 can prevent radiant heat from the inside of the furnace when the converter furnace port 12 is tilted to the furnace back side 32. The protective wall 23 is usually provided with a window 24, and the window 24 is provided to be openable and closable. In the advance position 33 of the profile meter 8, it is preferable that the window 24 of the protective wall 23 is in an open position and the profile meter 8 is close to the furnace port 12 of the converter up to the position where the protective wall 23 is disposed. As a result, the imaging range 43 of the profile meter 8 can be observed up to the refractory furnace inner surface 17 of the furnace upper portion 15 of the converter 11 (FIG. 2A). Although FIG. 2A shows the imaging range 43 in the vertical direction 40, the same imaging range 43 is also provided in the left-right direction (tilting axis direction 42). Moving forward to a position closer to the furnace port 12 than the position where the protective wall 23 is disposed is not preferable because it becomes a passing position of fallen objects from the converter upper space.

  As described above, the advance position 33 of the profile meter 8 is the shape of the refractory furnace inner surface 17 in the converter through the furnace port 12 by the profile meter 8 when the furnace port 12 of the converter is tilted to the furnace back side 32. A part or all of the position is an observable position.

  Further, as described above, the advance position 33 of the profile meter 8 needs to be as close as possible to the furnace port 12, and is therefore a position where the window 24 of the protective wall 23 on the furnace side 32 can be placed open. In order to close the 23 windows 24, it is necessary to retract the profile meter 8 to a position away from the converter 11. In the present invention, the profile meter 8 can be moved by the moving device 3, and the forward movement position 33 is a position where the distance between the profile meter 8 and the furnace port 12 is closer than the backward movement position 34. Thus, if the profile meter 8 is disposed at the retreat position 34 (see the two-dot chain line portion in FIG. 1), the window 24 of the protective wall 23 can be closed.

  In the present invention, preferably, the refractory profile in the converter furnace can be measured even at the retracted position 34 of the profile meter 8 (FIG. 2B). By opening the window 24 provided in the protective wall 23 on the furnace side 32, it is possible to observe a part of the inside of the furnace even from the retracted position 34. When the window 24 of the protective wall 23 is opened, the profile meter 8 is disposed at the retreat position 34 and the converter is set at the 90 ° tilt position 38, and at least the converter 11 is set as the imaging range 43 of the profile meter 8 through the window 24. It is preferable to provide a window 24 so that the furnace bottom 13 can be observed. Thereby, the refractory profile of a part of the converter furnace wall can be measured through the window 24 of the protective wall 23. For example, by catching the timing at which the converter tilt angle θ becomes 90 ° during converter steelmaking, the window 24 of the protective wall 23 is opened, and the inside of the furnace is observed with the profile meter 8 arranged at the retreat position 34. The refractory profile of the furnace bottom 13 can be measured. Since such a measurement becomes possible, the refractory profile measurement can be performed once per heat for at least the bottom 13 of the converter without affecting the cycle time of the converter.

  In order to perform refractory profile measurement at both the forward position 33 and the backward position 34 of the profile meter 8, the profile meter 8 is provided on the furnace shaft 18 at the 90 ° tilt position 38 at both the forward position 33 and the backward position 34. And preferred. At this time, the movement path between the forward movement position 33 and the backward movement position 34 coincides with the furnace shaft 18 at the 90 ° tilting position 38.

  Since the present invention has a structure in which the profile meter 8 is connected to the building structure 22, the position reproducibility of the profile meter 8 at the forward position 33 and the backward position 34 can be within ± 1 mm in both the front, rear, left, and right directions. Further, an error between the actual tilt angle and the measured tilt angle when the converter is stopped at an arbitrary tilt angle can be within ± 0.1 °. As a result, the measurement accuracy in the refractory thickness direction in the refractory furnace inner surface shape (refractory profile) of the converter is maintained at ± 7 mm at the furnace bottom 13, ± 7 mm at the furnace belly 14, and ± 10 mm at the furnace top 15. It becomes possible to do.

  As described above, the present invention can dispose the positional relationship between the converter 11 and the profile meter 8 at the time of measuring the refractory profile with good reproducibility including the angle, which is different from the method described in Patent Document 1. However, it is not necessary to use three reference points provided in the vicinity of the converter furnace port. On the other hand, it is preferable to use any fixed point in the imaging range as a reference point in order to confirm that the arrangement position of the profile meter 8 at the forward position 33 and the backward position 34 is a planned position.

  The profile meter 8 used in the present invention may be of any form as long as it is a shape measuring device that can measure the distance to the imaging target in each imaging region of the two-dimensional imaging range 43. For example, a stereo photography method, that is, a method in which two photographing systems separated by a predetermined distance in a direction perpendicular to the photographing direction are provided and a plurality of images with different photographing angles with respect to the same object is used is used. it can. Further, various distance meters using laser, microwave, ultrasonic wave, etc., which can measure the distance to each imaging part in the two-dimensional imaging range can also be used. In the case of a laser distance meter, a two-dimensional range can be measured by irradiating a subject with a laser beam from a light source and scanning the irradiation direction of the laser beam within the imaging range. The reflected light of the laser beam is received by a light receiver, and the distance is measured by measuring the time required from the irradiation of the laser to the reception of the reflected light. Here, the two-dimensional imaging range 43 means having an imaging range in both the vertical direction 40 and the horizontal direction (tilting axis direction 42).

  The upper space of the hearth 21 on the converter furnace back side 32 is also a space for performing various operations. Slag darts 25 may be used to reduce slag outflow at the end of converter steelmaking (see FIG. 5). When the slag darts 25 are charged into the furnace, the slag dart charging device 26 is disposed in the hearth upper space on the furnace back side 32. It is preferable that the refractory profile measuring device 1 of the present invention is housed so as not to interfere with various operations on the hearth during the standby time when no measurement is performed. For example, the arm 7 that connects the moving device 3 and the profile meter 8 is provided so as to be rotatable around a rotating shaft 6 near the moving device 3, and at the standby time, as shown by the solid line in FIG. 7 and the profile meter 8 are housed in a standby position 37 near the moving device. At the time of measuring the refractory profile, the arm 7 is rotated to the measurement position 35 as shown by a two-dot chain line portion in FIG. In FIG. 3, it is disposed at the retracted position 34. Furthermore, as shown in FIG. 4, the profile meter 8 can be moved from the retreat position 34 (solid line) to the advance position 33 (two-dot chain line).

  In the converter refractory profile measuring method using the converter refractory profile measuring apparatus of the present invention, the converter furnace port 12 is tilted to the furnace side 32 at two different timings, and the forward position 33 and the backward position are retracted. Measure the thickness of the refractory at each location between two timings by measuring the refractory profile of the converter using the profile meter 8 at one or both of the positions 34 and comparing the refractory profiles at the two timings. Can be evaluated. As the two different timings, for example, the first timing is the timing immediately after the construction of the refractory ware brick, and the second timing is an arbitrary timing during operation of the converter. As the converter tilt angle of the furnace side 32, a 90 ° tilt position 38 can be used. By comparing the measurement results of the refractory profile at the first timing and the second timing, it is possible to evaluate the refractory thickness increase / decrease amount of each part at the second timing as compared with immediately after the construction of the ware brick. it can. The furnace inner surface 17 of the refractory 16 shown in FIG. 2 shows the situation immediately after building the ware brick of the converter refractory. In FIG. 6, the furnace inner surface 17a of the refractory immediately after building the refractory refractory wear brick at the first timing is indicated by a two-dot chain line, and the furnace inner surface of the refractory during operation of the converter at the second timing. 17 is indicated by a solid line. In addition, about the refractory profile at the time of ware brick construction, it may replace with the measurement using the profile meter 8, and may use the refractory profile read from the brick construction drawing.

  In the present invention, when the refractory profile is measured by the profile meter 8, the converter tilt angle θ is preferably 90 °, but may be an angle other than 90 °. Measurement can be performed within the range of θ = 90 ° ± 15 °. Further, when measuring at two different timings, it is preferable that both have the same converter tilt angle, but different converter tilt angles θ may be used. However, it is necessary that the actual value of the converter tilt angle θ can be accurately measured with an accuracy of ± 0.1 ° at any converter tilt angle.

  The position of the profile meter 8 at the forward movement position 33 is preferably a position that intersects the furnace shaft 18 of the tilted converter 11, but measurement is possible even if it is away from the furnace shaft 18. If the distance from the furnace axis is within a range of ± 300 mm, sufficient measurement is possible. Further, when the measurement is performed at two different timings, it is preferable that the position of the profile meter 8 is the same, but it may be arranged at different positions. However, in any position, it is necessary that the position of the profile meter 8 can be accurately measured with an accuracy of ± 1 mm.

The imaging center direction of the profile meter at the advanced position is preferably parallel to the furnace axis 18, but may be deviated from parallel. In addition, when measuring at two different timings, the imaging center direction of the profile meter may be different.

  When the refractory profile is measured also at the retreat position 34, the same consideration as the advance position 33 is necessary with respect to the converter tilt angle θ, the arrangement position of the profile meter 8, and the imaging center direction of the profile meter 8.

  The present invention was applied in a 300 ton top-bottom converter. In the converter 11, the furnace shaft 18 is located at a position 1300 mm above the hearth 21 at a 90 ° tilt position 38 toward the furnace side 32. A protective wall 23 is provided between the space on the hearth of the hearth side 32 and the converter 11. The protective wall 23 is provided with a window 24 that can be opened and closed (see FIG. 1).

  The gantry 2 of the present invention was fixed to a steel structure portion (building structure 22) at a position that becomes a ceiling position when viewed from the hearth 21 on the hearth side 32. Further, the moving device 3 is provided on the gantry 2. The moving device 3 employs a mechanism in which the moving carriage 5 linearly advances and retreats on the rail 4 provided on the gantry 2 side. The movable carriage 5 is provided with an arm 7 via a rotating shaft 6, and a profile meter 8 is disposed at the tip of the arm 7. The arm 7 can be rotated around the rotation axis 6 by an electric cylinder. By rotating the arm 7 around the rotation shaft 6, the arm 7 can be moved between the measurement position 35 and the standby position 37 (see FIGS. 3 and 5). A preparation position 36 is provided between the measurement position 35 and the standby position 37 (see FIG. 5). When the arm 7 is at the measurement position 35, the profile meter 8 can be disposed at the forward position 33 and the backward position 34 by the movement of the moving device 3 (see FIG. 4). In both the forward movement position 33 and the backward movement position 34, the profile meter 8 is arranged at a position along the furnace axis 18 at the 90 ° tilt position 38. The distance between the tip of the converter 12 at the 90 ° tilt position 38 and the profile meter 8 is 1400 mm at the forward position 33 and 4200 mm at the reverse position 34.

  As the profile meter 8, a commercially available laser distance meter type was used. The imaging range is a range of 110 ° in both the vertical direction 40 and the horizontal direction (tilting axis direction 42). At the advanced position 33, the entire refractory surface in the furnace can be observed through the furnace port 12. On the other hand, at the retreat position 34, a range of 25 ° can be observed through the window 24 provided in the protective wall 23 in both the vertical direction and the horizontal direction, and the entire furnace bottom 13 can be observed.

  The accuracy of the stop position of the profile meter 8 is within ± 1 mm both in front, rear, left and right, and the error between the actual tilt angle and the measured angle when the converter tilts is within ± 0.1 °. Therefore, without providing any reference point, the refractory profile in the furnace is measured in the thickness direction of the refractory with an accuracy of ± 7 mm at the furnace bottom 13, ± 7 mm at the furnace belly 14, and ± 10 mm at the furnace top 15. be able to.

  As shown in FIG. 5, when the arm 7 is set at the standby position 37 (two-dot chain line), normal work performed on the hearth 21 on the furnace side 32 can be performed without any trouble. In the preparation position 36 (solid line), the operation | work which throws in the slag dart 25 which is the operation | work in steeling out to the molten steel surface in a furnace can be performed. At the measurement position 35 (two-dot chain line), the slag dart charging operation cannot be performed. In the present embodiment, the arm 7 is disposed at the preparation position 36, the arm 7 is moved from the preparation position 36 to the measurement position 35 (retracted position 34) during the steelmaking in the converter, and is profiled at the timing of the 90 ° tilt position 38. The furnace 8 is imaged by the meter 8 (FIG. 2 (B)), and all the operations until the arm 7 is immediately returned from the measurement position 35 to the preparation position 36 can be completed within 60 seconds. Therefore, after the profile is measured at the 90 ° tilt position 38 and returned to the preparation position, the slag dart charging operation at the end of steelmaking can be performed without any delay. As described above, when measuring the profile of the converter bottom 13 by placing the profile meter 8 at the retreat position 34, the work is performed during the converter steelmaking operation, and the cycle time of the converter is affected. The measurement can be completed without affecting.

  Taking the timing at which it is possible to devote some time until the raw material charging of the next heat is completed after the steel is discharged and discharged from the converter, the measurement is performed with the profile meter 8 placed at the forward position 33. After completion of the discharge, the converter 11 is tilted to the 90 ° tilt position 38 on the furnace side, the window 24 of the protective wall 23 on the furnace side 32 is opened, and the profile meter 8 is disposed at the advance position 33 (FIG. 2 (A )). By performing imaging in this state, the entire refractory surface in the furnace can be set as the imaging range 43 and the refractory profile can be measured. Since the steel is discharged and discharged, the surface of the refractory is not covered with molten steel or slag, and all surfaces are exposed, and imaging is possible. Even when such a measurement is performed, the influence on the cycle time of the converter can be suppressed within 2 minutes at most.

  First, the refractory profile immediately after building the converter brick is measured by the apparatus of the present invention (FIG. 2A) and recorded as the initial profile. Next, at the time of steel output for each heat of the converter, the refractory profile of the furnace bottom portion 13 is measured after the profile meter 8 is disposed at the retreat position 34 (FIG. 6B). The refractory thickness difference from the initial profile was calculated and displayed as a refractory wear amount on a two-dimensional map. Further, the window 24 of the protective wall 23 is opened at a rate of once per 10 heats, and the refractory profile is measured for the entire surface in the furnace after the profile meter 8 is disposed at the advance position 33 (FIG. 6A). ), Similarly, the difference in thickness of the refractory from the initial profile was calculated and displayed on the two-dimensional map as the amount of refractory wear.

  When a part where the amount of refractory wear is partially advanced is found on the displayed map, repair is performed by spraying a refractory for repair in a concentrated manner on the part where the refractory wears. It was possible to suppress the progress of wear. Since it was possible to prevent wasteful refractory spraying on parts where wear did not progress, the necessary refractory life could be ensured while reducing the basic unit of refractory used for repair.

DESCRIPTION OF SYMBOLS 1 Converter refractory profile measuring apparatus 2 Mounting frame 3 Moving apparatus 4 Rail 5 Moving carriage 6 Rotating shaft 7 Arm 8 Profile meter 11 Converter 12 Furnace port 13 Furnace bottom part 14 Furnace part 15 Furnace upper part 16 Refractory 17 Furnace inner surface 18 Furnace shaft 19 Tilt shaft 20 Steel outlet 21 Furnace 22 Building structure 23 Protective wall 24 Window 25 Slag darts 26 Slag dart charging device 31 Furnace side 32 Furnace side 33 Advance position 34 Retreat position 35 Measurement position 36 Preparation position 37 Standby position 38 90 ° tilt position 39 Furnace body origin 40 Height direction 41 Front-rear direction 42 Tilt axis direction 43 Imaging range θ Converter tilt angle

Claims (3)

An apparatus for measuring a refractory furnace inner surface shape (hereinafter referred to as “refractory profile”) of a converter,
The stand fixed to the building structure on the side where the converter furnace tilts when steel is output from the converter (hereinafter referred to as the “furnace side”), and the distance to the imaging target in each imaging region of the two-dimensional imaging range A shape measuring device (hereinafter referred to as a “profile meter”) that can measure the position, and a moving device connected to the gantry, the moving device moving the profile meter between a forward position and a backward position; Have
The forward position is a position at which part or all of the refractory furnace inner surface shape in the converter furnace can be observed through the furnace port by the profile meter when the furnace port of the converter is tilted to the furnace back side. The converter refractory profile measuring device, wherein the forward position is a position where the distance between the profile meter and the furnace port is closer than the backward position.   The retracted position is a position where a part of the refractory furnace inner surface shape in the converter furnace can be observed through the furnace port by the profile meter when the furnace port of the converter is tilted to the furnace back side. The converter refractory profile measuring apparatus according to claim 1. A converter refractory profile measuring method using the converter refractory profile measuring device according to claim 1 or 2,
At two different timings, the converter throat is tilted to the back of the furnace, and the refractory profile of the converter is measured using the profile meter at one or both of the forward position and the backward position. A method of measuring a refractory profile of a converter, comprising evaluating a thickness increase / decrease amount of the refractory between two timings by comparing the refractory profiles.

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