JP6848652B2 - Converter refractory profile measuring device and converter refractory profile measuring method - Google Patents

Description

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

A converter for refining molten metal such as molten iron is provided with a refractory lined in a container formed of iron skin and having a furnace mouth at the top of the furnace so as to be tiltable around a tilting axis. In the refining of molten iron, hot metal and scrap are first charged from the furnace opening. The converter opening is tilted to the hot metal charging side (hereinafter referred to as the "front side of the furnace"), and scrap is charged from the scrap chute and hot metal from the hot metal pot is charged into the furnace via the hot metal. Next, pure oxygen top-blown refining is performed with the furnace upright (the position where the furnace mouth is directly above). Bottom blowing is also performed in the upper bottom blowing converter. When the refining is completed, the converter is tilted to the side opposite to the front side of the furnace, and molten steel is ejected through the steel outlet provided in the furnace belly of the converter. The side where the converter opening is tilted at the time of steel ejection is called the furnace back side. One cycle from the charging of raw materials (scrap / hot metal) to the removal of steel / slag through acid-feeding refining (blown smelting) is called "heat" here.

During converter refining, molten slag is formed on the surface of molten iron in order to refine and remove impurities in the molten iron, and the molten iron is vigorously agitated by oxygen blowing. Further, in the upper bottom blowing converter, a bottom blowing tuyere is provided on the bottom of the furnace. The refractory constructed in the converter is exposed to the high temperature of the molten iron that is agitated, the surface is worn by the reaction with the formed molten slag, and the refractory near the bottom blowing tuyere is caused by bottom blowing. As a result, wear progresses.

The refractory lining of a converter is generally constructed of two layers: a perm brick on the side close to the iron skin and a ware brick on the inside of the furnace. As the wear of the wear bricks progresses, the wear bricks will eventually be completely replaced. If the refractory wear is locally progressing, the wear is repaired by spraying the refractory on the part where the wear is progressing. If it is possible to accurately grasp the part of the inner surface of the refractory furnace where wear is progressing and the amount of wear, the thickness of the refractory can be secured by spray repair on that part, and the cause of local wear can be determined. It is also possible to identify and consider permanent measures, and it is possible to extend the refractory life of the converter.

Patent Document 1 discloses a method of calculating a profile of a refractory by imaging the refractory including a reference point in a converter. The imaging is a camera (3D camera) that captures a plurality of images of the same object at different shooting angles, and can be called a so-called stereo photography method. In the same document, a digital 3D camera is installed near the converter using a tripod. By providing three reference points near the furnace mouth of the converter and determining three-dimensional coordinates based on the reference points, profiles taken at different timings are associated with each other. Further, in Patent Document 2, it is a method of measuring the residual thickness of the wear layer in a container for molten metal, in which a step of measuring the position information of the perm layer in advance and using it as a reference and a step of measuring the position information of the wear layer and measuring in advance. A method including a step of determining the residual thickness of the wear layer by comparing with the position information of the perm layer is disclosed. A laser range finder is used as a position information measuring means.

JP-A-2009-68982 Japanese Unexamined Patent Publication No. 2014-142152

In converter refining, molten steel is produced by repeating the cycle (heat) of charging raw materials, blowing, and discharging and discharging steel. 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. It is most preferable if the refractory profile can be measured once for each heat. On the other hand, when maximization of molten steel production is requested, it is not preferable to suspend the production of the converter for refractory profile measurement.

On the other hand, in the method described in Patent Document 1, a 3D camera is installed at a predetermined position using a tripod, and the converter is tilted so that the 3D camera can take a picture of the inside of the furnace through the furnace opening of the converter. It is necessary to take an image. Therefore, it is indispensable to suspend the operation of the converter in order to measure the refractory profile, which has been a factor of lowering 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 opening of the converter, and three-dimensional coordinates are obtained based on the reference points. It was essential to determine. In the vicinity of the furnace mouth of the converter, slag and bare metal tend to adhere due to slag blowout during blowing, and it may be difficult to maintain the reference point so that it can always be recognized by the 3D camera.

The present invention provides a converter refractory profile measuring device and a converter refractory profile measuring method that eliminate or minimize the interruption of the cycle time of converter refractory and do not require a reference point to be provided near the converter mouth. The purpose is to do.

That is, the gist of the present invention is as follows.
(1) Refractory of converter A device for measuring the inner surface shape of a furnace (hereinafter referred to as "refractory profile").
A pedestal fixed to the building structure above the hearth on the side where the converter opening tilts (hereinafter referred to as the "backside") when steel is ejected from the converter, and each imaging site in the two-dimensional imaging range. A shape measuring device (hereinafter referred to as "profile meter") capable of measuring the distance to the imaging target, and a moving device connected to the gantry, by moving the moving trolley forward and backward along the rail. It has a moving device for moving the profile meter between a forward position and a backward position.
The forward position is a position where a part or all of the surface shape of the refractory inside the converter can be observed through the furnace opening by the profile meter when the furnace opening of the converter is tilted toward the back of the furnace. A converter refractory profile measuring device characterized in that the forward position is a position where the distance between the profile meter and the furnace opening is closer than the backward position.
(2) The retracted position is a position where a part of the inner surface shape of the refractory furnace in the converter can be observed through the furnace opening by the profile meter when the furnace opening of the converter is tilted toward the back of the furnace. The converter refractory profile measuring device according to (1) above.
(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 opening is tilted toward 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, and the refractory profile of the converter is measured at two timings. A method for measuring a converter refractory profile, which comprises evaluating the amount of increase / decrease in the thickness of the refractory between two timings by comparing the refractory profiles.

By the converter refractory profile measuring device and the converter refractory profile measuring method of the present invention, the cycle time interruption of the converter refractory is eliminated or minimized, and the converter is not provided with a reference point near the converter opening. The inner surface shape of the refractory furnace (refractory profile) can be measured.

It is a side view which shows the positional relationship between the converter refractory profile measuring apparatus of this invention, and a converter. It is a side sectional view which shows the positional relationship between the converter refractory profile measuring apparatus of this invention, and a converter, and shows the case where the profile meter is in the forward position (A), and the backward 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 front view of BB arrow 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 front view of BB arrow view. It is a figure which shows the positional relationship between the converter refractory profile measuring apparatus of this invention, and peripheral equipment, (A) is a side view, (B) is a front view. It is a side sectional view which shows the measurement situation of the refractory profile using the converter refractory profile measuring apparatus of this invention, and shows the case where the profile meter is in a forward position (A), and a backward position (B).

The present invention will be described with reference to FIGS. 1 to 6.
The present invention is a shape measuring device capable of measuring the distance to an imaging target at each imaging site in a two-dimensional imaging range when measuring the shape (refractory profile) of the refractory furnace inner surface 17 of the converter 11. (Profile meter 8) is used.

The vertical axis when the converter 11 is upright is called the furnace shaft 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. Further, the converter 11 is provided so as to be tiltable around the tilting shaft 19. The furnace shaft 18 and the tilting shaft 19 are provided at right angles to each other. The intersection of the furnace shaft 18 and the tilting shaft 19 is called the 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 referred to as a hearth 21 here. On the side where the turning furnace 11 is tilted and the scrap and hot metal are charged (31 on the front side of the furnace), the hot metal pot containing the hot metal is lifted by an overhead crane, and the hot metal is charged into the converter from the hot metal pot. Therefore, the hearth 21 on the front side 31 of the furnace has a large space, and a high space is secured up to the traveling position of the overhead crane above the hearth. On the other hand, on the side where molten steel is discharged by tilting the converter opening (further back side 32), the ceiling and the floor structure of the next floor are formed immediately above the furnace floor 21 to form the building structure 22. are doing. When the converter is tilted 90 ° toward the back side 32, the furnace shaft 18 of the converter 11 is usually arranged at a position slightly higher than the hearth 21 and is located parallel to the hearth 21. The angle between the furnace shaft 18 and the vertical line is defined as the converter tilt angle θ. The converter tilt angle θ when the converter 11 is tilted toward the back of the furnace is set as a positive value.

The present invention comprises a gantry 2 fixed to a building structure 22 on the back side 32 of the furnace and a moving device 3 connected to the gantry 2 when arranging a profile meter 8 for measuring a refractory profile of a converter. The profile meter 8 is provided with a moving device 3 for moving the profile meter 8 between the forward position 33 and the backward position 34. As the building structure 22 for fixing the gantry 2, a steel structure portion of a portion that is located at the ceiling position when viewed from the hearth 21 of the hearth side 32 can be used. The moving device 3 arranged between the gantry 2 and the profile meter 8 can employ, for example, a mechanism in which the moving trolley 5 linearly moves forward and backward on the rail 4 provided on the gantry 2 side. An arm 7 can be provided on the moving carriage 5, and a profile meter 8 can be arranged at the tip of the arm 7. By moving the moving carriage 5 forward and backward on the rail 4, the profile meter 8 can be arranged at each of the forward position 33 and the backward position 34. In FIG. 1, the forward position 33 is shown by a solid line, and the backward position 34 is shown 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 can be stopped accurately at the position.

The forward position 33, which is the arrangement position of the profile meter 8, will be described with reference to FIGS. 1 and 2 (A). The inner surface shape of the refractory furnace in a normal converter cross section is formed from a furnace bottom portion 13, a cylindrical furnace belly portion 14, and a furnace upper portion 15 having a width narrowing toward the furnace opening 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 furnace upper part 15 is hidden behind the furnace port 12 and observed. Can not do it. Further, when the distance from the furnace opening 12 is further increased, the refractory furnace inner surface 17 of the furnace belly portion 14 is also hidden behind the furnace opening 12 and becomes invisible. Therefore, in order to observe the refractory furnace inner surface 17 of the furnace upper portion 15 at the forward position 33 of the profile meter 8, it is necessary to position the profile meter 8 as close to the furnace port 12 as possible.

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

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

Further, as described above, the forward position 33 of the profile meter 8 needs to be as close as possible to the furnace port 12, and therefore, the protective wall can be arranged with the window 24 of the protective wall 23 on the back side 32 open. In order to close the window 24 of the 23, 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 position 33 is a position where the distance between the profile meter 8 and the furnace port 12 is closer than the backward position 34. As a result, if the profile meter 8 is arranged at the retracted 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 can be measured even at the retracted position 34 of the profile meter 8 (FIG. 2 (B)). By opening the window 24 provided on the protective wall 23 on the back side 32 of the furnace, 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 placed at the retracted position 34, 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 the window 24 so that the bottom portion 13 of the furnace can be observed. As a result, the refractory profile of a part of the converter wall can be measured through the window 24 of the protective wall 23. For example, by grasping the timing when the converter tilt angle θ becomes 90 ° during the 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 retracted position 34. The refractory profile of the bottom 13 can be measured. Since such measurement is possible, the refractory profile can be measured once per heat for at least the bottom portion 13 of the converter without affecting the cycle time of the converter at all.

In order to measure the refractory profile 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. Is preferable. At this time, the movement path between the forward position 33 and the backward position 34 coincides with the furnace shaft 18 at the 90 ° tilt 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 each of the front, back, left, right, top and bottom. Further, the error between the actual tilt angle and the measured tilt angle when the converter is stopped at an arbitrary tilt angle can also be within ± 0.1 °. As a result, the measurement accuracy in the refractory thickness direction of the refractory inner surface shape (refractory profile) of the converter is maintained at ± 7 mm at the bottom 13 of the furnace, ± 7 mm at the abdomen 14, and ± 10 mm at the top 15. It becomes possible to do.

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

The profile meter 8 used in the present invention may be of any type as long as it is a shape measuring device capable of measuring the distance to the imaging target at each imaging portion of the two-dimensional imaging range 43. For example, it is possible to use a stereo photography method, that is, a system in which two shooting systems separated by a predetermined distance in a direction perpendicular to the shooting direction are provided and a plurality of images with different shooting angles are captured for the same object. it can. It is also possible to use various rangefinders that use lasers, microwaves, ultrasonic waves, etc., and that can measure the distance to each imaging site in the two-dimensional imaging range. With a laser rangefinder, a two-dimensional range can be measured by irradiating a shooting target 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 the receiver, and the time required from the laser irradiation to the reception of the reflected light is measured to measure the distance. Here, the two-dimensional imaging range 43 means that the imaging range is provided in both the vertical direction 40 and the horizontal direction (tilt axis direction 42).

The upper space of the hearth 21 on the back side 32 of the converter is also a space for performing various operations. Slag darts 25 may be used to reduce slag runoff at the end of converter steelmaking (see FIG. 5). When the slag darts 25 are charged into the furnace, the slag darts charging device 26 is arranged in the space above the hearth of 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 period when measurement is not 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 during the standby period, as shown by the solid line in FIG. Both the 7 and the profile meter 8 are housed in the standby position 37 near the mobile device. Then, at the time of measuring the refractory profile, as shown by the two-dot chain line portion in FIG. 3, the arm 7 is rotated to set the measurement position 35. In FIG. 3, it is arranged at the retracted position 34. Further, as shown in FIG. 4, the profile meter 8 can be moved from the backward position 34 (solid line) to the forward position 33 (two-dot chain line).

In the converter refractory profile measuring method using the converter refractory profile measuring device of the present invention, the converter refractory port 12 is tilted to the back side 32 at two different timings, and the converter is tilted forward and backward to the forward position 33. 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, the amount of increase / decrease in the thickness of the refractory at each part between the two timings. Can be evaluated. As the two different timings, for example, the first timing is the timing immediately after the ware brick of the converter refractory is constructed, and the second timing is an arbitrary timing during the operation of the converter. As the converter tilt angle of the furnace back 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 amount of increase / decrease in the thickness of the refractory at 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 the ware brick of the converter refractory is constructed. In FIG. 6, the furnace inner surface 17a of the refractory immediately after the ware brick of the converter refractory was constructed at the first timing is a two-point chain wire, and the furnace inner surface of the refractory during the converter operation at the second timing. 17 is shown by a solid line. As for the refractory profile at the time of ware brick construction, the refractory profile read from the brick construction drawing may be used instead of the measurement using the profile meter 8.

In the present invention, when measuring the refractory profile with the profile meter 8, it is preferable that the converter tilt angle θ is 90 °, but an angle other than 90 ° may be used. 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 to be able to accurately measure the actual value of the converter tilt angle θ with an accuracy of ± 0.1 ° regardless of the converter tilt angle.

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

The image pickup center direction of the profile meter at the forward position is preferably parallel to the furnace shaft 18, but may be out of parallel. Further, when measuring at two different timings, the imaging center direction of the profile meter may be different.

When measuring the refractory profile also in the retracted position 34, the same consideration as in the advanced position 33 is required 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 blown converter. In the converter 11, the furnace shaft 18 is located 1300 mm above the hearth 21 at the 90 ° tilt position 38 with respect to the back side 32. A protective wall 23 is provided between the space on the hearth of the furnace back side 32 and the converter 11. Further, 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 the steel structure portion (building structure 22) of the portion that is located at the ceiling position when viewed from the hearth 21 of 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 moves forward and backward on the rail 4 provided on the gantry 2 side. The moving carriage 5 is provided with an arm 7 via a rotating shaft 6, and a profile meter 8 is arranged at the tip of the arm 7. The arm 7 can be rotated around the rotation shaft 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 arranged 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 position 33 and the backward position 34, the profile meter 8 is arranged at a position along the furnace shaft 18 at the 90 ° tilt position 38. The distance between the tip of the furnace opening 12 of the converter at the 90 ° tilt position 38 and the profile meter 8 is 1400 mm at the forward position 33 and 4200 mm at the backward position 34.

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

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

As shown in FIG. 5, when the arm 7 is set to the standby position 37 (two-dot chain line), the normal work performed on the hearth 21 on the back side 32 can be performed without any trouble. At the preparation position 36 (solid line), the work of throwing the slag darts 25, which is the work during steel ejection, into the surface of the molten steel in the furnace can be performed. At the measurement position 35 (two-dot chain line), the slag darts loading operation cannot be performed. In this embodiment, the arm 7 is arranged at the preparation position 36, the arm 7 is moved from the preparation position 36 to the measurement position 35 (backward position 34) during the converter steelmaking, and the profile is profiled at the timing of the 90 ° tilt position 38. An image of the bottom 13 of the furnace is taken by the meter 8 (FIG. 2B), and the entire work from the measurement position 35 to the preparation position 36 of the arm 7 can be completed within 60 seconds. Therefore, after measuring the profile at the 90 ° tilt position 38 and returning to the preparatory position, the slag darts loading operation at the end of steel removal can be performed without any delay. As described above, when the profile meter 8 is arranged at the retracted position 34 and the profile of the bottom 13 of the converter is measured, the work is performed during the steelmaking work of the converter, which has no effect on the cycle time of the converter. The measurement can be completed without any effect.

The profile meter 8 is placed at the forward position 33 to perform the measurement at the timing when it is possible to take some time before the raw material is charged in the next heat after the steel is discharged and discharged from the converter. After the completion of slag, the converter 11 is tilted to the 90 ° tilt position 38 on the back side of the furnace, the window 24 of the protective wall 23 on the back side 32 is opened, and the profile meter 8 is placed at the forward position 33 (FIG. 2 (A). )). By taking an image in this state, the entire surface of the refractory in the furnace can be set as the imaging range 43, and the refractory profile can be measured. Since the steel removal and slag removal have been completed, the surface of the refractory is not covered with molten steel or slag, and all the surfaces are exposed, so that 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 the most.

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

If a part of the refractory wear is found on the displayed map, it is repaired by spraying the refractory for repair intensively on the part where the amount of wear is progressing. Was able to suppress the progress of wear. Since it is possible to prevent unnecessary spraying of the refractory on the part where the wear has not progressed, it was possible to secure the required life of the refractory while reducing the basic unit of the refractory for repair.

1 converter refractory profile measuring device 2 gantry 3 moving device 4 rail 5 moving carriage 6 rotating shaft 7 arm 8 profile meter 11 converter 12 furnace mouth 13 furnace bottom 14 furnace belly 15 furnace top 16 refractory 17 furnace inner surface 18 Furnace shaft 19 Tilt shaft 20 Steel outlet 21 Furnace floor 22 Building structure 23 Protective wall 24 Window 25 Slug darts 26 Slug darts input device 31 Furnace front side 32 Furnace back side 33 Forward position 34 Retreat position 35 Measurement position 36 Preparation position 37 Standby position 38 90 ° tilt position 39 Furnace origin 40 Height direction 41 Front-back direction 42 Tilt axis direction 43 Imaging range θ converter tilt angle

Claims (3)

Refractory of converter A device that measures the inner surface shape of a furnace (hereinafter referred to as "refractory profile").
A gantry fixed to the building structure above the hearth on the side where the converter opening is tilted when steel is ejected from the converter (hereinafter referred to as the "backside"), and each imaging part in the two-dimensional imaging range. A shape measuring device (hereinafter referred to as "profile meter") capable of measuring the distance to the imaging target, and a moving device connected to the gantry, by moving the moving trolley forward and backward along the rail. It has a moving device for moving the profile meter between a forward position and a backward position.
The forward position is a position where a part or all of the surface shape of the refractory inside the converter can be observed through the furnace opening by the profile meter when the furnace opening of the converter is tilted toward the back of the furnace. A converter refractory profile measuring device characterized in that the forward position is a position where the distance between the profile meter and the furnace opening is closer than the backward position. The retracted position is characterized in that when the furnace opening of the converter is tilted toward the back of the furnace, a part of the surface shape of the refractory inside the furnace can be observed through the furnace opening by the profile meter. The converter refractory profile measuring device according to claim 1. A method for measuring a converter refractory profile using the converter refractory profile measuring device according to claim 1 or 2.
At two different timings, the converter opening is tilted toward 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, and the refractory profile of the converter is measured at two timings. A method for measuring a converter refractory profile, which comprises evaluating the amount of increase / decrease in the thickness of the refractory between two timings by comparing the refractory profiles.

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