Method for judging slagging of converter sublance holder

Abstract

The invention relates to a method for judging slagging of a converter sublance holder, which comprises the following steps of: 1, firstly, determining a slagging identification area according to the specific mounting positions and sizes of a sublance adapter, a holder and a connector; 2, after the measured probe is removed in the reset period of the sublance, the sublance stops when rising to a waiting position, and image data in the slag-bonding recognition area are collected at the position and the time point, and 3, pixels in the slag-bonding recognition area are recognized one by one, read and stored, the temperature of each pixel is read, and the temperature of each pixel is calculated. And comparing the temperature of the hot steel slag with the normal temperature of the holder, and calculating the height and area of the slagging area. And if the automatic slag removal device is arranged in the sublance system, the control system automatically sends an operation command to the slag removal device, and the slag removal device automatically operates without manual intervention.

Description

Technical Field

[0001] The invention relates to a method, in particular to a method for judging slagging of a converter auxiliary gun holder, and belongs to the technical field of converter auxiliary guns. Background Art

[0002] At present, the top and bottom double-blown converters basically use auxiliary guns for temperature measurement, carbon determination, oxygen determination, and liquid level measurement. The auxiliary gun head is composed of an adapter, a clamp and a connector. The clamp of the auxiliary gun is installed at the lower end of the auxiliary gun body through an adapter, and the probe is installed on the clamp. The connector is installed at the lower end of the clamp, and the electrical connection is achieved through the 6 electrodes in the connector and the probe. In the process of inserting the auxiliary gun into the molten steel for measurement, the connection part between the auxiliary gun body and the clamp is prone to steel slag. After cooling, the steel slag is very hard, which causes the auxiliary gun probe to be not connected in place, affecting the transmission of the signal, and ultimately causing inaccurate measurement or measurement failure. The main purpose of the present invention is to determine the slag condition after collecting images with an infrared camera, and to issue an early warning through the control system to let the operator know, report the problem in time, or start the slag removal equipment to remove the slag.

[0003] The retrieved CN100482810C - A method and device for maintaining and cleaning slag in a top and bottom combined blowing converter auxiliary gun is a method and device for cleaning slag after the auxiliary gun is slagging. It does not mention the content of judging slagging and has no relevance and inspiration to the present invention.

[0004] From the retrieved CN1106155A-shape recognition method, it identifies the target shape presented in the form of a row of small dots by comparing with a standard shape model. This method requires a reference model for comparison. It is different from the method used by this method to identify and perform statistical judgment through the temperature of pixel points using an infrared camera, which has no relevance or inspiration to the present invention. Summary of the invention

[0005] The present invention aims at the problems existing in the prior art and provides a method for judging the slagging of the auxiliary gun holder of the converter. The technical scheme adopts an infrared camera to collect the slagging status of the connecting part of the auxiliary gun holder, and then judges the temperature of each pixel point in the area, calculates the slagging area and height by pixel unit, and starts the slag cleaning equipment according to the preset alarm threshold. At the same time, an alarm is sent to the operator, who pays attention to or takes subsequent measures according to the alarm information.

[0006] In order to achieve the above object, the technical solution of the present invention is as follows: a method for judging slagging of a converter auxiliary gun holder, characterized in that the method comprises the following steps:

[0007] Step 1: First, determine the slagging identification area according to the specific installation position and size of the auxiliary gun adapter, the clamp and the connector;

[0008] Step 2: After the measured probe is removed during the reset cycle of the auxiliary gun, the auxiliary gun rises to the waiting position and stops. Image data in the slagging identification area is collected at this position and time point.

[0009] Step 3: Identify the pixels in the slag identification area one by one and read and store them. By reading the temperature of each pixel and comparing them with the temperature of the hot slag and the normal temperature of the clamp, calculate the height and area of ​​the slag area. After calculation, the slag morphology of the slag area is obtained, which is then divided into two identification quantities: pixel height and pixel area. A comprehensive judgment is made based on the two parameters of slag height and area according to the set rules, and a warning message or fault message is issued. The slag cleaning equipment is started through the control system, and the operator is informed through the human-machine interface to take the next step.

[0010] In step 1, two infrared cameras No. 1 (6) and No. 2 (7) are installed in horizontally symmetrical positions to collect infrared images of the slagging area. After the collection, the next step of processing is carried out.

[0011] Among them, in step 2, when the auxiliary gun completes the measurement, it will rotate from the measuring position to the connecting position, at which the used probe will be removed. After removal, the auxiliary gun rises to the waiting position and stops, and then prepares for the next operation. When the auxiliary gun rises to the waiting position, the slag has not cooled down yet, and the temperature of the slag is higher than the normal temperature of the gun body and the environment. The infrared camera starts working to collect infrared images of the slag area. In order to prevent the cooling of the slag from affecting the judgment, the collection time is controlled within 10 seconds, and then the collection system makes a slag judgment.

[0012] Among them, in step 3, the method for judging slagging is mainly to read the temperature of each pixel point according to the collected infrared image. Since the temperature of the steel slag just after the measurement is higher than the normal temperature of the gun body and the environment, the slag amount is judged based on this. The calculation of slagging pixels is mainly based on the slagging temperature. The specific value of the benchmark slagging temperature is an empirical data measured in the field. The first-hand data is obtained by continuous manual measurement of the clamp body without slag on site. After collecting these data on site, they are further screened and finally the critical temperature value of slagging is determined. This temperature is used as the reference value. This temperature value is defined as C0, and the pixels greater than this temperature value are judged as slagging pixels.

[0013] Compared with the prior art, the present invention has the following advantages. First, it completely relies on the infrared camera to automatically collect images, automatically calculate, and automatically issue corresponding warning information. In this way, the operator does not need to be distracted by the auxiliary gun. He only needs to pay attention to and report the alarm when it sounds. Second, since the slagging amount is graded, light slagging and heavy slagging are distinguished. For light slagging, if the production rhythm is tight, production can be continued without treatment. For heavy slagging, it is necessary to report the repair immediately to minimize the impact. Third, the time for judging slagging is set after the probe is disassembled after the measurement of the previous furnace is completed. At this time, slagging is detected and an alarm is issued. There is about 30 minutes between the measurement of the next furnace and the time for the next furnace measurement. This time can be fully arranged for processing and will not affect production. Fourth, if an automatic slag cleaning device is configured in the auxiliary gun system, the control system automatically sends an operating command to the slag cleaning device, and the slag cleaning device automatically runs without manual intervention. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 , comparison chart of slagging of auxiliary gun.

[0015] Figure 2 , infrared camera installation location diagram.

[0016] Figure 3 , schematic diagram of slagging area.

[0017] Figure 4 , slag form 1.

[0018] Figure 5 , slag form 2.

[0019] Figure 6 , system structure.

[0020] In the figure: 1 auxiliary gun body, 2 probe, 3 clamp, 4 connector, 5 slagging area, 6 camera No. 1, 7 camera No. 2, 31 auxiliary gun clamp, 32 slagging identification area, 33 auxiliary gun probe, 41 slagging area, 42 non-slagging area. DETAILED DESCRIPTION

[0021] In order to deepen the understanding of the present invention, the present embodiment is described in detail below with reference to the accompanying drawings.

[0022] Example 1: See Figure 1 , a method for judging slagging of a converter auxiliary gun holder, the method comprising the following steps:

[0023] Step 1: First, determine the slagging identification area according to the specific installation position and size of the auxiliary gun adapter, the clamp and the connector;

[0024] Step 2: After the measured probe is removed during the reset cycle of the auxiliary gun, the auxiliary gun rises to the waiting position and stops. Image data in the slagging identification area is collected at this position and time point.

[0025] Step 3: Identify the pixels in the slag identification area one by one and read and store them. By reading the temperature of each pixel and comparing them with the temperature of the hot slag and the normal temperature of the clamp, calculate the height and area of ​​the slag area. After calculation, the slag morphology of the slag area is obtained, which is then divided into two identification quantities: pixel height and pixel area. A comprehensive judgment is made based on the two parameters of slag height and area according to the set rules, and a warning message or fault message is issued. The slag cleaning equipment is started through the control system, and the operator is informed through the human-machine interface to take the next step.

[0026] In step 1, two infrared cameras No. 1 (6) and No. 2 (7) are installed in horizontally symmetrical positions to collect infrared images of the slagging area. After the collection, the next step of processing is carried out.

[0027] Among them, in step 2, when the auxiliary gun completes the measurement, it will rotate from the measuring position to the connecting position, at which the used probe will be removed. After removal, the auxiliary gun rises to the waiting position and stops, and then prepares for the next operation. When the auxiliary gun rises to the waiting position, the slag has not cooled down yet, and the temperature of the slag is higher than the normal temperature of the gun body and the environment. The infrared camera starts working to collect infrared images of the slag area. In order to prevent the cooling of the slag from affecting the judgment, the collection time is controlled within 10 seconds, and then the collection system makes a slag judgment.

[0028] Among them, in step 3, the method for judging slagging is mainly to read the temperature of each pixel point according to the collected infrared image. Since the temperature of the steel slag just after the measurement is higher than the normal temperature of the gun body and the environment, the slag amount is judged based on this. The calculation of slagging pixels is mainly based on the slagging temperature. The specific value of the benchmark slagging temperature is an empirical data measured in the field. The first-hand data is obtained by continuous manual measurement of the clamp body without slag on site. After collecting these data on site, they are further screened and finally the critical temperature value of slagging is determined. This temperature is used as the reference value. This temperature value is defined as C0, and the pixels greater than this temperature value are judged as slagging pixels.

[0029] The specific process is as follows: A method for judging slagging of the converter auxiliary gun holder, Figure 1 This is a comparison of the connection status of the auxiliary gun with slagging and without slagging. Figure 1 After slagging in slagging area 5, the contact surface between the six electrodes in the probe and the six electrodes of the connector will be smaller than the designed area, which will affect the connection tightness and contact resistance of the probe, and further affect the actual measurement accuracy. The more slagging there is, the greater the impact, and eventually the measurement cannot be completed.

[0030] This system Figure 6As shown, it consists of 5 parts in total, namely infrared camera, image processing and data calculation, auxiliary gun PLC, human-machine interface, and slag cleaning equipment.

[0031] In order to judge the slagging area, Figure 2 As shown, two infrared cameras 6 and 7 are installed in horizontally symmetrical positions to collect infrared images of the slagging area. After the images are collected, the next step of processing is performed.

[0032] When the auxiliary gun completes the measurement, it will rotate from the measuring position to the connecting position, where the used probe will be removed. After removal, the auxiliary gun rises to the waiting position and stops, and then prepares for the next operation. When the auxiliary gun rises to the waiting position, the slag has not cooled down yet, and the temperature of the slag is higher than the normal temperature of the gun body and the environment. The infrared camera starts to work and collects infrared images of the slag area. In order to prevent the cooling of the slag from affecting the judgment, the collection time is controlled within 10 seconds, and then the collection system makes a slag judgment.

[0033] The method of judging slagging is mainly to read the temperature of each pixel point based on the collected infrared image. Since the temperature of the steel slag just after the measurement is higher than the normal temperature of the gun body and the environment, the slag amount is judged based on this. The calculation of slagging pixels is mainly based on the slagging temperature. The specific value of the benchmark slagging temperature is a measured empirical data. The first-hand data is obtained by continuous manual measurement of the unslagging clamp body on site. After the data are collected on site, they are further screened and finally the critical temperature value of slagging is determined. This temperature is used as the reference value. This temperature value is defined as C0. Pixels greater than this temperature value are judged as slagging pixels.

[0034] To implement quantitative processing, Figure 3 As shown, the rectangular range formed by ABCD is used as the slagging identification area 2, and the range is defined as w*h, w represents the pixel width, which actually corresponds to the maximum diameter of the connection between the auxiliary gun holder and the adapter, and h represents the pixel height, which corresponds to the height of a single electrode of the auxiliary gun connector. The total pixel area is defined as N, and the rectangular area ABCD is the area for image calculation. Images exceeding this area are not processed. Therefore:

[0035] N=w*hFormula 1

[0036] N represents the total pixel area of ​​the slag recognition area

[0037] w represents the pixel width of the slag recognition area

[0038] h represents the pixel height of the slag recognition area

[0039]

[0040] A represents the calculated actual slag pixel area

[0041]

[0042] K A Indicates the percentage of slagging area to slagging identification area

[0043] In Formula 2, Ni represents the pixel point corresponding to the slag identification area. If the temperature of A1 is greater than C0, then A1=1. If the temperature of Ai is greater than C0, then Ai=1. The value of A after summation is the area of ​​slag.

[0044] The method of judging by area is mainly aimed at slagging form 1, such as Figure 4 As shown, this type of slag is relatively uniform, and the slag is evenly deposited downward along the holder. From the outline, it is close to a rectangle. This type of slag is more suitable for judging by area.

[0045] The first judgment rule is that when A is greater than or equal to 20% and less than 40% of the area of ​​the identification area, it is judged as light slagging and a warning message is issued. When A is greater than or equal to 40% of the area of ​​the identification area, it is judged as heavy slagging and a fault message is issued.

[0046]

[0047]

[0048] H1 represents the slag pixel height of the first column in the slag identification area;

[0049] H2 and H3 represent the slag pixel heights of the second and third columns, and so on;

[0050] Hw represents the slag pixel height of the last column in the slag identification area;

[0051] K H It represents the percentage of the maximum slag pixel height from the first column to the last column to the slag identification area height;

[0052] The heights in Formula 4 and Formula 5 are both from top to bottom.

[0053] In formula 4, H1 represents the slag pixel point corresponding to the height direction of the first column of the slag identification area. If the temperature of B1 is greater than C0, then B1 = 1. If the temperature of Bj is greater than C0, then Bj = 1. The method of judging by height is mainly aimed at slag form 2, such as Figure 5 As shown, this slagging shape is slagging downward along the holder, but only a part is very prominent downward, and from the outline, it is close to a shape similar to an icicle or an ice cone.

[0054] The second judgment rule is that when K HWhen A is greater than or equal to 25% and less than 45% of the height of the identification area, it is judged as light slagging and a warning message is issued. When A is greater than or equal to 45% of the area of ​​the identification area, it is judged as heavy slagging and a fault message is issued.

[0055] Table 1 Slagging determination table Slagging determination table

[0056]

[0057] According to the on-site tracking of the use of the auxiliary gun, data collection, and experience summary, combined with the two factors of slagging area and slagging height, a comprehensive judgment is made. The judgment rules are shown in Table 1. The judgment result defines the slagging index, which is quantified into 1, 2, and 3. 1 means normal, 2 means light slagging, which can continue to be used, but a warning needs to be issued to the operator, and 3 means heavy slagging. The equipment can no longer be used normally and a command needs to be issued to the PLC system to start the slagging equipment. If the slagging equipment is not installed on site, an alarm will be issued to the operator through the human-machine interface, and the maintenance personnel will arrange for processing to clear the slag from the clamp.

[0058] It should be noted that the above embodiments are not intended to limit the protection scope of the present invention, and equivalent changes or substitutions made on the basis of the above technical solutions all fall within the protection scope of the claims of the present invention.

Claims

1. A method for determining slagging of a converter auxiliary gun holder, characterized in that: The method comprises the following steps: Step 1: First, determine the slagging identification area according to the specific installation position and size of the auxiliary gun adapter, the clamp and the connector; Step 2: After the measured probe is removed during the reset cycle of the auxiliary gun, the auxiliary gun rises to the waiting position and stops. Image data in the slagging identification area is collected at this position and time point. Step 3: Identify the pixels in the slag identification area one by one and read and store them. By reading the temperature of each pixel and comparing them with the temperature of the hot slag and the normal temperature of the clamp, calculate the height and area of ​​the slag area. After calculation, the slag morphology of the slag area is obtained, which is then divided into two identification quantities: pixel height and pixel area. A comprehensive judgment is made based on the two parameters of slag height and area according to the set rules, and a warning message or fault message is issued. The slag cleaning equipment is started through the control system, and the operator is informed through the human-machine interface to take the next step.

2. The method for determining slagging of a converter auxiliary lance holder according to claim 1, characterized in that: In step 1, two infrared cameras No. 1 (6) and No. 2 (7) are installed in horizontally symmetrical positions to collect infrared images of the slagging area. After the collection, the next step of processing is carried out.

3. The method for determining slagging of a converter auxiliary lance holder according to claim 1, characterized in that: In step 2, when the auxiliary gun completes the measurement, it will rotate from the measuring position to the connecting position, at which the used probe will be removed. After removal, the auxiliary gun rises to the waiting position and stops, and then prepares for the next operation. When the auxiliary gun rises to the waiting position, the slag has not cooled down yet, and the temperature of the slag is higher than the normal temperature of the gun body and the environment. The infrared camera starts working to collect infrared images of the slag area. In order to prevent the cooling of the slag from affecting the judgment, the collection time is controlled within 10 seconds, and then the collection system makes a slag judgment.

4. The method for determining slagging of a converter auxiliary lance holder according to claim 1, characterized in that: In step 3, the method for judging slagging is mainly to read the temperature of each pixel point based on the collected infrared image. Since the temperature of the steel slag just after the measurement is higher than the normal temperature of the gun body and the environment, the slag amount is judged based on this. The calculation of slagging pixels is mainly based on the slagging temperature. The specific value of the benchmark slagging temperature is an empirical data measured in the field. The first-hand data is obtained by continuous manual measurement of the clamp body without slag on site. After collecting these data on site, they are further screened and finally the critical temperature value of slagging is determined. This temperature is used as the reference value. This temperature value is defined as C0, and pixels greater than this temperature value are judged as slagging pixels.

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