JPH09209013A - Detection of clogging of iron tapping hole by picture processing and method for releasing clogging - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly and simply detect the clogging and the closing of an iron tapping hole and to immediately enable the release of the clogging by judging the diameter of the iron tapping hole based on the distribution of brightness on a prescribed line in a video of the iron tapping hole taken with an image pickup camera. SOLUTION: The video of the iron tapping hole during iron-tapping in a blast furnace is taken with the image pickup camera from a position at about 45 deg. angle. The distribution 8 of brightness on the preset line 7 in the video 6 of this iron tapping hole 1 is measured by a picture processing. At this time, it is judged as the diameter 10 of the iron tapping hole that the length of the continued straight line part having the preset brightness or higher is expressed with dot number. When this iron tapping hole diameter 10 becomes the preset diameter or smaller, it is judged that the iron tapping hole 1 is clogged. By this method, in the case of detecting the clogging of the iron tapping hole 1, immediately, the alarm is sounded and the discharge of molten iron and slag in the blast furnace is promoted by driving a metallic rod.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting clogging at a taphole by image processing and a method for eliminating clogging, and in particular,
The present invention relates to a new improvement for measuring the luminance distribution of an image of a taphole in a blast furnace taphole by image processing, detecting clogging of the taphole, and eliminating the clogging.

[0002]

2. Description of the Related Art Generally, blast furnace tapping operation is to drive a mud material filled in the blast furnace tap hole with a gold rod having an arbitrary diameter, and then pull it out to discharge the hot metal accumulated inside the blast furnace to the outside of the furnace. . Once tapping starts, an average of 2 hours to 4
When the furnace is emptied and there are no emissions, the mud material is filled into the taphole again and mud firing is performed until the next tapping. During this tapping, the coke inside the furnace suddenly clogs the taphole, or the hot metal that jumps out of the furnace,
The slag may hang down toward the bottom of the taphole and harden and grow to close the taphole. If the taphole is clogged or closed in this way, it becomes impossible to discharge the hot metal and slag in the furnace, and a large amount of hot metal and slag accumulate in the furnace.
As a result, the air permeability in the furnace deteriorates, causing abnormal furnace conditions such as unstable falling of blast furnace charge, slipping, and blow-through. When more hot metal and slag accumulate in the furnace, they reach the tuyere level of the blast furnace, causing the tuyere to melt and become a major problem. Therefore, conventionally, a blast furnace pre-worker always directly monitors the tap hole, and when it is determined that clogging and closing of the tap hole have occurred, the gold rod is again driven into the tap hole, the hot metal in the furnace,
I tried to promote the discharge of slag.

[0003]

Since the conventional method for clogging and clearing the tap hole is constituted as described above, the following problems exist. That is, the area around the taphole is extremely hot, and there is an extremely terrible environment in which dust, smoke, sparks, etc. are generated, and it is extremely harsh for the operator to constantly monitor. Also, even if this monitoring work is done remotely through a camera, it must always be present in front of this monitor, and the image is very difficult to see because of the terrible environment.
There is a problem in that the detection of clogging and closure of the taphole requires the judgment of a skilled worker. In addition, when the worker overlooked the clogging of the taphole and missed the blockage, the timing of driving the gold rod was delayed and the blast furnace was in a very unstable state.

The present invention has been made in order to solve the above problems, and in particular, the operator does not need to constantly monitor the taphole and does not require many years of experience as an operator. It is an object of the present invention to provide a method for detecting a clogging at a taphole and a clogging elimination method by image processing, which can promptly detect clogging and closure of a pigtail and promptly accelerate discharge of molten pig iron and slag in a gold rod driving furnace. .

[0005]

According to the method for detecting clogging of a taphole by image processing according to the present invention, an image of the taphole is captured by an image pickup camera during tapping of the blast furnace, and a preset line in the video is taken. The brightness distribution is measured by image processing, and the length of the continuous straight line portion having a brightness equal to or higher than the preset brightness is determined as the tap hole diameter, and when the tap hole diameter becomes equal to or less than the preset diameter, the tap hole This is a method to judge that the jam has occurred.

More specifically, it is a method of expressing the length by the number of dots.

According to the method for eliminating clogging of a taphole by image processing according to the present invention, when a clogging of the taphole is detected by the method according to claim 1, an alarm is generated and a gold rod is driven into the taphole to cause the blast furnace. This is a method of promoting the discharge of hot metal and slag inside.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of a method for detecting clogging at a taphole and a method for eliminating clogging by image processing according to the present invention will be described in detail below. In FIG. 1, reference numeral 1 is a taphole of the blast furnace, and an image pickup camera 2 composed of a CCD camera is provided above the taphole 1 and the taphole imaged by the image pickup camera 2 is provided. The image 6 of No. 1 is taken into a known image processing device 3 having an alarm device 4 and subjected to image processing, and the image processing device 3 is configured to be processed by an external signal 5 which is a control signal from the outside. ing.

Next, the operation will be described. First, the taphole 1 is photographed by the image pickup camera 2. As for the installation location of the imaging camera 2, the change in the tap hole diameter of the tap hole 1 is most visible, and the position where the imaging camera 2 is easily maintained is good. The positions were shifted from each other. The image pickup camera 2 is housed in a water cooling box (not shown) to protect it from high radiation heat, and environmental measures are taken. In addition, this water cooling box,
The glass slides so that it can be replaced easily. A line 7 for vertically cutting the center of the taphole 1 is preset in the image 6 showing the taphole 1. This line 7 is designed so that the molten iron and slag that jumps out of the blast furnace hang down toward the bottom of the taphole 1 and solidify and can be detected, and the true taphole diameter 10 of the taphole 1 can be measured. Set to.

The brightness distribution 8 on the line 7 is represented by the image processing device 3, and the brightness is measured in all 256 gradations from 0 to 255. A predetermined level of set brightness 9 is provided in the brightness distribution 8, and the length of the continuous straight line portion corresponding to the set brightness 9 or higher is calculated with the number of dots as the tap hole diameter 10.
The set brightness 9 is set to 150 gradations, which is 60% of the total gradation 256, because the rising of the brightness distribution 8 is sensitive and it does not reach that when the taphole 1 is clogged.

The image processing apparatus 3 starts after receiving the external signal 5 for starting the tapping, and stops the processing operation when receiving the external signal 5 for ending the tapping. Therefore, the tap diameter 10 is calculated and detected by the image processing device 3 every 5 minutes. From the start to the end of tapping, the tap diameter 10 is the set diameter 11
When the following occurs, an alarm is announced to the worker by the alarm device 4. This set diameter 11 is usually 50 for the tap hole diameter 10.
Since it is a dot, it is set to 15 dots which is 30% of the whole. Therefore, for example, as shown in FIG.
If the tap diameter 10 does not exist from to t2, the alarm is continuously announced. After the above-mentioned alarm announcement is performed, the worker can immediately drive a gold rod (not shown) into the taphole 1 to accelerate the discharge of the hot metal and slag in the blast furnace.

The present invention comprises the above steps,
This process is automatically executed, the clogging situation of the tap 1 is detected, an alarm is announced to the worker when the tap 1 is closed, and the worker immediately drives the gold rod into the tap 1. It is possible to accelerate the discharge of hot metal and slag in the blast furnace.

[0013]

Since the method for detecting clogging of a taphole by image processing and the method for eliminating clogging according to the present invention is configured as described above, the following effects can be obtained. That is, even if the worker does not constantly monitor the taphole, by performing image processing based on the luminance distribution of the taphole, an alarm is automatically announced when the taphole is clogged or closed, and the gold bar is immediately pressed. Can be driven into the tap hole to accelerate the discharge of hot metal and slag in the furnace. Moreover, the worker does not need to be skilled, and the judgment of clogging and closure is very uniform, and highly efficient blast furnace tapping work can be performed.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a tap hole clogging detection method and clogging elimination method by image processing according to the present invention.

FIG. 2 is a video diagram of a taphole.

FIG. 3 is a luminance distribution diagram in a setting line in the image of FIG.

FIG. 4 is a characteristic diagram showing a transition example of a tap diameter.

[Explanation of symbols]

 1 tap hole 2 imaging camera 3 image processing device 4 alarm device 5 external signal 6 image 7 setting line 8 brightness distribution 9 setting brightness 10 tapping hole diameter 11 setting diameter

Claims (3)

[Claims] 1. A luminosity distribution on a line (7) set in advance in the image (6) by capturing an image (6) of the tap hole (1) with an imaging camera (2) during tapping of the blast furnace. (8) was measured by image processing, and the length of the straight line portion that was continuous over the preset brightness was judged to be the tap hole diameter (10), and the tap hole diameter (10) became less than or equal to the preset diameter. At this time, a clogging of the taphole (1) is determined by image processing. 2. The method according to claim 1, wherein the length is represented by the number of dots. 3. The taphole according to the method of claim 1.
When the clogging of (1) is detected, an alarm is generated, and a metal rod is driven into the tap hole (1) to promote the discharge of the hot metal and slag in the blast furnace, and the clogging of the tap hole by image processing is characterized. How to resolve.