JPS5857268B2 - How do you know what to do and what to do? - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for determining the condition of a refractory in a sliding opening/closing device for a metallurgical container.

Metallurgical containers such as ladle and tundish are usually equipped with a sliding opening/closing device such as a rotary nozzle.

Generally, as shown in FIG. 1, this sliding opening/closing device has a fixing plate 3 provided with a runner hole 4 that matches the nozzle hole installed under an upper nozzle 1a provided in a metallurgical container 1. A sliding plate 5 provided with one to several runner holes 6 under this fixed plate 3 rotates (or moves laterally) while slidingly contacting the lower surface of the fixed plate.
The structure is such that a collector nozzle 1 is removably attached to the lower part of the runner hole of this sliding plate, and the fixed plate 3 and the sliding plate 5 are each made of a material such as firebrick. Refractories (formed in clusters)

This sliding opening/closing device 2 rotates the sliding plate 5 to align the runner hole 6 with the runner hole 4 of the fixed plate 3 when pouring out the molten metal in the container 1, and rotates the sliding plate 5 to align the runner hole 4 of the fixed plate 3. 5a is used to close the runner hole 4 of the fixing plate described in i11. However, the molten metal is at a high temperature of 1600℃1)1), and this sliding opening/closing device can be used under severe conditions. In order to be used, the sliding surfaces 3a and 5a of the fixed plate 3 and the sliding plate 5 and the runner hole 4 are
, 6 are severely damaged and it is extremely dangerous to leave them unattended, so it is necessary to check the damage status of the refractories each time they are used.

This damage to the refractories, that is, the fixed plate 3 and the sliding plate 5, is caused by the molten metal flowing through the runner holes 4 and 6 at high speed, so when the runner holes are opened and closed, the runner holes in the sliding plate 5 are damaged. 6 faces the runner hole 4 of the fixed plate 3 with a deviation, first the runner hole 6 of the sliding plate side
The upper edge 6a of is damaged as shown by the dotted line in FIG.
From this runner hole edge 6a to the inner surface of the runner hole 6 and the sliding surface 5a
The damage progresses to the runner hole edge 4 of the fixed plate 3.
a, the runner holes 4 and the sliding surface 3a are damaged, and in some cases, the sliding surface 5a of the sliding plate 5 is damaged by molten metal when it passes under the runner hole of the fixed plate 3. Damage may occur directly between the dashed lines shown in FIG.

In this way, damage to the refractories of the sliding opening/closing device 2 is preceded by damage to the sliding plate 5, followed by damage to the fixed plate 3, so when investigating the damage to the refractories, It goes without saying that observing the condition of the sliding plate 5 is advantageous in accurately determining the condition of the refractory.

However, the conventional method for determining the condition of refractories is that the judgment staff looks into the 1G runner hole or measures the runner hole diameter using an appropriate hole diameter measuring device. The internal atmosphere of the container is at a high temperature of approximately 150 to 350°C due to the heating of the container by molten metal, making it impossible for personnel to enter and inspect the container visually, and the container may cool down. It would be extremely inefficient to wait until the
This can only be done from the outside of the container, and although it is possible to measure the runner hole diameter and inspect the runner hole edge of the fixed plate and its sliding surface, it is possible to measure the runner hole diameter and inspect the runner hole edge of the fixed plate and its sliding surface. The edge of the hole and the sliding surface cannot be inspected at all, and we have no choice but to estimate the damage to the sliding plate based on the damage to the fixed plate and then replace the refractories on the safe side. It had the disadvantage that it had to be replaced early even though it could still be used, leading to increased costs, and that it took time to assess the damage.

In addition to such a determination method, there is also a method of disassembling the sliding switchgear and directly examining the damage to the refractories, but this method is time-consuming and is not practical.

This invention was made in view of the above-mentioned circumstances, and its purpose is to accurately determine the damage status of the sliding plate and fixed plate without disassembling the sliding opening/closing device. To submit a method for determining the condition of refractories in sliding opening/closing devices for metallurgical containers, which is effective for determining the damage to the runner hole edges and sliding surfaces of sliding plates especially when the atmosphere inside the container is high temperature. It is in.

An embodiment of the invention will be described below with reference to the drawings.

In Fig. 3, 1 is a metallurgical container (for example, a container for metallurgy).
2 is a sliding opening/closing device attached to the bottom of the container 1.

9 is a television camera housed in a heat insulating container 11; 10 is a maximum of 400 mmffW attached to this television camera 9;
12 is a motorized device for moving the heat insulating container 11 back and forth to adjust the camera position;
Reference numeral 3 denotes a heat insulating filter installed in front of the zoom lens 10, which is attached to a movable table 14 that can be moved vertically and horizontally to form an imaging device 8.

Cooling air or cooling water is sent to the heat insulating container 11 and the heat insulating filter 13 via piping 15, and a floodlight 16 equipped with a highly condensing lens is provided near the imaging device 8. It is provided so as to move together with the imaging device 8.

Note that at least the portion in front of the zoom lens of the heat insulating container 11 and the moving stage 14 are formed to be transparent.

On the other hand, reference numeral 17 denotes a remote side panel 18 that controls the electric device 12, adjusts the position of the movable table 14, adjusts the zooming system of the zoom lens 10, and adjusts the projection angle of the projector 16.
are V and T for recording image signals from the television camera 9;
, R device, 19 is the television camera 9 or the V, T,
This is an autopsy pattern signal generator that converts the image signal from the R device 18 into an autopsy pattern signal by operating a wiper and sends it to the cathode ray tube 20 a of the monitor receiver 20 . The cathode ray tube image positions of the captured image and the recorded image of the V, T, R device 18 are also selected.

However, in this method, the zoom lens 10 is zoomed out, the image captured by the television camera 9 is displayed on the monitor cathode ray tube 20a, the metallurgical container 1 is placed in front of the imaging device 8, and the inner bottom surface is imaged. The image pickup device 8 is placed directly in front of the device 8, and while viewing the image of the inner bottom surface of the container displayed on the monitor cathode ray tube 20a, the moving table 14 is moved by operating the remote control panel 11, and the position of the imaging device 8 is determined by the TV camera 9. After adjusting the nozzle hole of the metallurgical container 1 at the center a of
The zoom lens 10 is zoomed in and the cathode ray tube 2 is
0a, the diameter of the runner hole, the edge of the runner hole of the sliding plate, and the sliding surface are examined by enlarging the image of the pattern of the runner hole of the sliding opening/closing device 2 seen through the nozzle hole. This is to judge the damage situation, and this judgment is made as follows.

In order to determine the extent of damage to refractories, it is necessary to know their dimensional pattern before use.

Therefore, in this method, first, a metallurgical container 1 to which a new refractory material, that is, a fixed plate and a sliding plate are attached, is carried in, and the inside of the runner hole of the sliding opening/closing device 2 is imaged by the television camera 9, while the fourth An image of the runner hole diameter as shown in FIG. 5 when the runner holes 4 and 6 of the fixed plate 3 and the sliding plate 5 are aligned as shown in the figure (an image of the runner hole 4 on the fixed plate side), An image of the runner hole edge 6a of the sliding plate 5 as shown in FIG. 7 when the runner holes 4 and 6 are shifted by a radius as shown in FIG.
As shown in FIG. 8, images of the sliding surface 5a of the sliding plate in a state where the runner hole 4 of the fixed plate 3 is closed with the sliding plate 5 are sequentially imaged on the monitor cathode ray tube 20a, and also from the AiJ television camera 9. The respective image signals of V, T, I (device 18
4, 6 and 6 in the same manner as described above each time the metallurgical container 1 is brought in after use. 8
The diameter of the runner hole, the edge of the runner hole of the sliding plate, and the dimension pattern of the sliding surface of the sliding plate in the state shown in the figure are imaged by the television camera 9, and the position of the autopsy pattern generator 19 is selected based on the image. As shown in Figure 10, an image is displayed on one half of the monitor cathode ray tube 20a, and the images corresponding to the images are
The recorded images of the T and R devices 18 are monitored on the cathode ray tube 20a.
This recorded image A and the captured image B are displayed on the other side.
By comparing and inspecting the dimensional pattern of the sliding plate 5, the state of damage to the sliding plate 5 can be quantitatively grasped and whether or not the sliding plate 5 has been used can be determined.

The recorded image A and the captured image rl may be converted into graphic patterns by the autopsy pattern generator 19 and imaged, and both images A and B may be imaged using two monitor cathode ray tubes. Alternatively, the images may be overlapped as shown in FIG. 11.

Next, an example of a method for determining whether or not the refractory can be used will be described.

Figures 12 to 14 show cathode ray tube images in which the recorded image A and the captured image B are overlapped, and the judgment from the runner hole diameter is based on the recorded image A shown in Figure 12. Measure the runner hole diameter and the maximum runner hole diameter e1 of the imaged image f-zoom B to find the runner hole diameter expansion rate (3,/L,
Whether or not refractories can be used is determined based on whether or not this expansion rate is within a specified value (in this case, the runner hole diameter is the diameter of runner hole 4 on the fixed plate; Since the moving plate side also expands in the same way, the runner hole diameter expansion rate of the fixed plate can be used to determine whether or not refractories can be used. The maximum distance between the edge of the runner hole in the recorded image A and the edge of the runner hole in the captured image B shown in the figure is measured, and the damaged length e2 is compared with a specified value to determine whether or not it can be used. Judgment from the sliding surface 5a is based on the maximum length 1 of the damaged portion 21 autopsied in the captured image B shown in FIG.
3 and the maximum width e4, and if either of them exceeds the specified value, it is determined that it cannot be used (in this case, it is not necessarily necessary to display the recorded image A on the cathode ray tube).
.

The above specified values are determined independently by each business establishment, and for example, if the runner hole diameter expansion rate g+/L is 1.6 times and the runner hole edge damage length is 30% or less, the use of the runner is prohibited. If specified, damage up to the shaded area in the determination table shown in FIG. 15 is determined to be usable.

In the above embodiment, the V, T, R device 18 and the autopsy pattern generator 19 automatically display the recorded image on the monitor cathode ray tube 20a. The dimensional pattern of the refractory before use may be marked on a transmission film, and this may be used as a reference dimensional pattern for comparison with the dimensional pattern of the used refractory imaged on a cathode ray tube.

In addition, this determination method can be applied to the sliding surface 3a of the fixed plate 3, the runner hole edge 4a thereof, and the runner hole 6 of the sliding plate 5 by providing the imaging device 8 on the outer bottom side of the metallurgical container 1. It can also be used for autopsy determining the state of damage, and it can also be used in combination with the above embodiments.

This invention aims to improve the size pattern of the refractories of the sliding opening/closing device, that is, the runner hole edges of the fixed plate and the sliding plate, and the dimensional pattern of the sliding surface of the sliding plate, which consists of a television camera, a zoom lens, and a monitor cathode ray tube. An image is displayed on the cathode ray tube by an industrial television, and this image and the runner holes of the fixed plate and sliding plate and the sliding surface of the sliding plate of the metallurgical container to which a new fixed plate and sliding plate have been installed are displayed on the television. Take an image with a camera @
This system is designed to quantitatively grasp the damage status of the fixed plate and sliding plate and determine whether or not they can be used by comparing images with reference dimension patterns marked or imaged on the cathode ray tube or other cathode ray tubes. Because of this, it is possible to accurately determine the damage status of the fixed plate and sliding plate without disassembling the sliding opening/closing device, and it is possible to accurately judge the damage status of the fixed plate and sliding plate without disassembling the sliding opening/closing device. Since the damage state of the sliding surface can be accurately determined, the refractory material, that is, the fixed plate and the sliding plate can be used to the maximum extent possible.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an example of a sliding opening/closing device, Fig. 2 is a plan view of the sliding plate thereof, Fig. 3 is a configuration explanatory diagram showing an embodiment of the present invention, and Figs. 4 and 5. 6 and 7 are diagrams of the imaging state of the runner hole and their video diagrams. FIGS. 8 and 9 are diagrams of the imaging state of the sliding surface. and its video diagram, Figures 10 and 11 are explanatory diagrams showing the Brown-free method, Figures 12 to 14 are explanatory diagrams showing the comparative autopsy method, and Figure 15 is an explanatory diagram showing the use of refractories. An example of a determination table to be used is shown. 1...Metallurgical container, 2...Sliding opening/closing device, 3゜5...Refractory (fixed plate, sliding plate), 3
a, 5a...Sliding surface, 4, 6...
Runway hole, 4a, 6a... Runway hole edge, 9...
...TV camera, 10...Zoom lens,
20a...Monitor cathode ray tube.

Claims (1)

[Claims] 1. In a sliding opening/closing device attached to a metallurgical container,
The refractory fixing plate of the sliding opening/closing device, the dimensional pattern of the runner hole edge of the sliding plate, and the dimensional pattern of the sliding surface of the sliding plate were observed from a television camera, a zoom lens, and a monitor cathode ray tube. An image is displayed on the cathode ray tube using an industrial television set, and this image is combined with the sliding surface of the metallurgical container's fixed plate and sliding plate to which a new fixed plate and sliding plate have been installed. The state of damage to the fixed plate and sliding plate is quantitatively understood by capturing an image with the television camera and displaying the image on the Braun tube or other cathode ray tube, or by comparing it with a marked reference pattern. A method for determining the status of a refractory in a sliding opening/closing device for a metallurgical container, characterized by determining whether or not it can be used.