CN113088621A - Automatic furnace lifting control method and system in converter tapping process - Google Patents
Automatic furnace lifting control method and system in converter tapping process Download PDFInfo
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- CN113088621A CN113088621A CN202110295287.5A CN202110295287A CN113088621A CN 113088621 A CN113088621 A CN 113088621A CN 202110295287 A CN202110295287 A CN 202110295287A CN 113088621 A CN113088621 A CN 113088621A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/50—Tilting mechanisms for converters
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/4673—Measuring and sampling devices
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- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses an automatic furnace lifting control method and system in a converter tapping process, wherein the method comprises the following steps: installing a camera at a proper position of the steel tapping side of the converter, and judging the slag overflowing condition of the converter mouth and the steel tapping hole in the steel tapping process according to the converter mouth and the video under the converter shot by the camera; processing a slag overflow signal detected at a furnace mouth and a slag overflow signal detected under a furnace to generate a furnace lifting instruction; and when the converter is in a waiting state, the converter is controlled to be lifted upwards after receiving a converter lifting instruction, the converter is not lifted any more within a certain time after being lifted once, and the converter is pressed downwards after delaying for a period of time after being lifted. The automatic furnace lifting control method provided by the invention obviously reduces the slag overflow condition of the furnace mouth in the automatic tapping process, reduces the labor intensity of workers, and improves the automation degree and the intelligent level of the tapping of the converter.
Description
Technical Field
The invention relates to the technical field of automatic control of converters, in particular to an automatic furnace lifting control method and system in the converter tapping process.
Background
Converter steelmaking is the most dominant steelmaking method in the world today, and the steel yield accounts for more than 65% of the total world steel yield. With the increasing demand of the market for high-quality steel, such as automobile plates, high-grade ship plates, electrical steel, stainless steel and the like, the requirement on the cleanliness of molten steel for converter steelmaking is higher and higher, and therefore the content of impurity elements in the molten steel is required to be as small as possible. In the process of pouring molten steel from the converter into the ladle at the final stage of converter steelmaking, slag also flows into the ladle together with the molten steel, and the cleanliness of the molten steel is affected. Therefore, strict control of the tapping process is an important means for avoiding steel slag from being mixed into the ladle.
The current converter tapping is that a worker controls the tilting of the converter by controlling a converter rocking handle in a converter rocking room, and the operation in the converter rocking process completely depends on the visual observation and the experience judgment of the converter rocking worker. The converter shaking worker firstly operates the converter to tilt to a certain angle, then stays for a period of time to wait for the molten steel to gradually flow into the ladle, and then stays for a period of time again to wait for the molten steel to flow into the ladle, so that the operation is repeated until the molten steel is completely discharged.
The automatic tapping method simulates manual tapping operation, the tapping process is divided into a plurality of steps, each step is used for establishing a converter inclination angle value and a stay duration value, and all the step parameters form a table called an inclination angle duration table. The automatic tapping control system controls the converter to complete the tapping process in steps according to the inclination angle time-length table.
Because the molten steel temperature in the converter is very high, the brightness is also very high, and in addition, the shielding of flame and smog causes very big influence to the visual observation of the rocking furnace worker, the error of manual judgement is great, and the control precision of manual rocking furnace is difficult to guarantee, and the condition of slagging often takes place when manual tapping. If the inclination angle of the converter is too large (the converter is shaken too fast), molten steel approaches a converter mouth, steel slag floating on the surface of the molten steel may overflow from the converter mouth, and the overflowed steel slag falls on a buggy ladle or a rail of the buggy ladle, so that a buggy ladle circuit may be burned, the rail of the buggy ladle may be blocked, and the slag discharge condition of the converter mouth should be avoided.
Disclosure of Invention
Aiming at the problems in the prior art, the first purpose of the invention is to provide an automatic furnace lifting control method in the converter tapping process, which can automatically lift the converter in the tapping process, reduce the condition of slag overflow at a furnace mouth and solve the problems of instability and poor precision of manual operation. The second purpose of the invention is to provide a converter tapping control system, which is used for executing the automatic furnace lifting control method of the first purpose of the invention.
In order to achieve the first purpose of the invention, the invention provides the following technical scheme:
an automatic furnace lifting control method in the converter tapping process comprises the following steps:
step S10, judging the slag overflow condition of the converter mouth during tapping according to the first video of the converter mouth, and generating a slag overflow signal for the converter mouth; judging the slag overflow condition under the converter during tapping according to the second video under the converter to generate a slag overflow detection signal under the converter;
step S20, processing a slag overflow signal detected at the furnace mouth and a slag overflow signal detected under the furnace to generate a furnace lifting instruction;
step S30, when the converter is in a waiting state, receiving a converter lifting instruction, controlling the converter to lift upwards, not lifting any more within a certain time after once lifting, and pressing downwards after delaying a period of time after lifting to a set inclination angle before lifting; the waiting state is a static state that the converter works at a set inclination angle.
Further, in step S1, the fire hole detection slag overflow signal includes a first fire hole detection slag overflow signal and a second fire hole detection slag overflow signal, and when it is recognized that the quantity of the fire hole slag is greater than the first threshold and smaller than the second threshold, the first fire hole detection slag overflow signal is given; when the furnace mouth slag quantity is larger than a second threshold value, a second furnace mouth detection slag overflow signal is given; wherein the first threshold is less than the second threshold; the furnace lifting instruction comprises a slow furnace lifting instruction and a fast furnace lifting instruction; in step S2, processing the slag overflow signal detected at the furnace mouth to generate a furnace lifting command, specifically including: and generating a slow furnace lifting instruction according to the first furnace mouth detection slag overflow signal, and generating a fast furnace lifting instruction according to the second furnace mouth detection slag overflow signal.
Further, in step S1, the under-furnace slag overflow detection signals include a first under-furnace slag overflow detection signal and a second under-furnace slag overflow detection signal, and when it is recognized that the under-furnace slag quantity is greater than a third threshold and less than a fourth threshold, the first under-furnace slag overflow detection signal is given; when the number of the slag under the furnace is identified to be larger than a fourth threshold value, a second slag overflow detection signal under the furnace is given; wherein the third threshold is less than the fourth threshold; the furnace lifting instruction comprises a slow furnace lifting instruction and a fast furnace lifting instruction; in step S2, detecting a slag overflow signal under the furnace, and generating a furnace lifting command, specifically including: and generating a slow furnace lifting instruction according to the slag overflow signal detected under the first furnace, and generating a fast furnace lifting instruction according to the slag overflow signal detected under the second furnace.
Further, the method for controlling the lifting of the converter after receiving the converter lifting command while the converter is in the waiting state in step S30 includes: when the converter is in a waiting state, receiving a slow furnace lifting instruction, lifting the converter according to a set first lifting speed, and continuing for a first furnace lifting time; when the converter is in a waiting state, receiving a rapid furnace lifting instruction, lifting the converter according to a set second lifting speed, and continuing for a second furnace lifting time; wherein the first lift-up velocity is less than the second lift-up velocity.
Further, the lift-up is not performed within a certain time after the lift-up in the step S30, and there are exceptions: and when a rapid furnace lifting signal is received in the slow furnace lifting process, immediately executing a rapid furnace lifting instruction, and simultaneously shortening the second furnace lifting time by a fixed time length.
Further, in step S30, the method for setting the inclination angle before the upward lifting is that the upward lifting is not performed within a certain time after the upward lifting, the downward pressing is performed after a time delay after the upward lifting, and the method for setting the inclination angle before the downward pressing until the upward lifting is performed is as follows: triggering a first timer and a second timer at the same time of furnace lifting, and not accepting a new furnace lifting instruction within the running time of the first timer and not lifting the furnace again; after the furnace lifting is finished, the converter keeps the current inclination angle until the timing of the second timer is finished; and after the timing of the second timer is finished, pressing the converter downwards to a set inclination angle before the converter is lifted upwards.
Further, the first video in step S10 is an infrared video, the converter, the molten steel and the slag are distinguished according to temperature information given by the infrared video, a slag overflow condition of the tap hole during tapping is determined, and a tap hole detection slag overflow signal is generated.
The automatic furnace lifting control method in the converter tapping process provided by the invention divides the automatic furnace lifting process of the converter into three steps. The first step is to generate slag overflow signals according to two paths of videos at a furnace mouth and below a furnace; the second step is a step of generating a furnace lifting instruction according to the slag overflow signal; the third step is a concrete furnace lifting control step, wherein the converter is controlled to be lifted upwards, the converter is not lifted any more within a certain time after being lifted once, the converter is pressed downwards after being lifted for a period of time, and the converter is pressed downwards to a set inclination angle before being lifted, so that the converter is prevented from overflowing slag again after being pressed downwards. And after the converter is pressed down to the original set inclination angle, the original tapping step is continuously executed, so that one-time furnace lifting operation is completely executed. Through the treatment, the slag overflowing situation of the furnace mouth in the tapping process of the converter is greatly improved, and the automation degree and the intelligent level in the tapping process are improved.
Compared with the prior art, the invention has the beneficial effects that: the automatic lifting device realizes the function of automatically lifting the converter in the tapping process of the converter, adopts the video identification technology to judge the situations of the slag overflow at the converter mouth and the slag overflow at the tapping hole according to two paths of videos at the converter mouth and the lower part of the converter, and controls the converter to automatically lift according to the slag overflow situation by the PLC, thereby obviously reducing the slag overflow situation in the automatic tapping process, reducing the labor intensity of workers and improving the automation degree and the intelligent level of the tapping of the converter.
In order to achieve the second purpose of the invention, the invention also provides the following technical scheme:
the utility model provides a converter tapping control system, includes converter, buggy ladle, industrial computer, PLC controller, converter tilting frequency converter, converter tilting motor, still includes: a first camera and a second camera; the first camera is arranged at the higher position of the steel tapping side of the converter and is used for shooting a first video at the converter mouth of the converter; the second camera is arranged at the lower part of the steel tapping side of the converter and is used for shooting a second video below the converter; the industrial computer is used for executing the steps S10 and S20 in the automatic furnace lifting control method of any one of the above schemes, and the PLC is used for executing the steps S30 in the automatic furnace lifting control method of any one of the above schemes.
Further, the first camera is an industrial infrared camera, and the second camera is an industrial color camera.
Compared with the prior art, the invention has the beneficial effects that: the converter tapping control system is provided with the two cameras at the proper position of the converter tapping hole so as to realize the acquisition of video at the converter tapping hole and under the converter, the video identification technology is adopted by the industrial computer to judge the situations of slag overflow at the converter tapping hole and slag overflow at the tapping hole and timely give a furnace lifting instruction, and the PLC controls the converter to automatically lift up according to the furnace lifting instruction, so that the slag overflow situation in the automatic tapping process is obviously reduced, the labor intensity of workers is reduced, and the automation degree and the intelligent level of the converter tapping are improved.
Drawings
FIG. 1 is a schematic view of a converter tapping control system provided in an embodiment of the present invention.
FIG. 2 is a schematic flow chart of a preferred embodiment of the automatic furnace lifting control method in the converter tapping process.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 shows an embodiment of a converter tapping control system according to the present invention, which includes a converter 6 tiltable back and forth, a ladle carriage 12 loaded with a ladle 11, an industrial infrared camera 13, a general industrial camera 14 (which may be referred to as an industrial color camera for the sake of convenience of distinction from the industrial infrared camera), a secondary computer 1 (or an industrial computer, an industrial personal computer), a PLC controller 2, a converter tilting frequency converter 3, and a converter tilting motor 4. The converter 6 has a tap hole 8 and a tap hole 9, and when tapping, the converter is tilted backward, gradually pressed down in steps, and molten steel 10 is poured from the tap hole 8 into a ladle 11. An inclination angle encoder 7 is installed on a rotating shaft of the converter, a tilting speed encoder 5 is installed on a converter tilting motor, the inclination angle encoder 5 is used for measuring an actual inclination angle value of the converter 6 and sending the actual inclination angle value to the PLC controller 2, the tilting speed encoder 5 is used for measuring an actual tilting speed value of the converter 6 and sending the actual tilting speed value to the PLC controller 2, the secondary computer 1 is used for self-learning historical data of manual steel tapping and generating a time-length table of the inclination angle of the steel tapping, and is also used for processing videos of a converter mouth and a steel outlet mouth shot by an industrial infrared camera 13 and a common industrial camera 14 to generate a slag overflow signal of the converter mouth and generating a slow furnace lifting instruction or a fast furnace lifting instruction after processing and sending the slow furnace lifting instruction or the fast furnace lifting instruction to the PLC controller 2, the PLC controller 2 is used for sending a set tilting speed value to the converter tilting frequency converter 3, and the converter tilting motor 4 is controlled by the converter, thereby controlling the rotation of the converter. The automatic furnace lifting control function in the converter tapping process is realized by programming in the secondary computer 1 and the PLC 2.
The invention provides an automatic furnace lifting control method in a converter tapping process, which is applied to a converter tapping control system shown in figure 1.
Referring to fig. 2, fig. 2 is a schematic flow chart of a preferred embodiment of the automatic furnace lifting control method in the converter tapping process.
In the preferred embodiment, the automatic furnace lifting control method in the converter tapping process comprises the following steps:
and step S10, a camera is installed at a proper position of the steel tapping side of the converter, and the slag overflowing situation of the furnace mouth in the steel tapping process is judged according to the video shot by the camera. The method specifically comprises the following steps:
and S101, installing an industrial infrared camera at a higher position of the steel tapping side of the converter, shooting a video at the furnace mouth of the converter, and judging the slag overflowing situation of the furnace mouth during steel tapping by the secondary computer according to the infrared video.
And an industrial infrared camera is arranged at the higher part of the steel tapping side of the converter to shoot the video at the converter mouth of the converter. The video shot by the industrial infrared camera contains temperature information, and the video shot by the infrared camera is processed because the temperatures of the molten steel, the steel slag and the converter body are greatly different, so that the steel slag and the converter body can be distinguished according to the temperature, and the quantity of the overflowing slag can be identified.
When the slag overflow occurs, the secondary computer generates two Boolean quantity signals according to the slag overflow quantity detected in the infrared video and sends the two Boolean quantity signals to the PLC controller, and two threshold values TH1 and TH2 are set, wherein TH2>TH1, if the overflow quantity exceeds TH1, an infrared detection furnace mouth overflow slag signal S is sent outinfra,nor(ii) a If the amount of the overflowing slag exceeds TH2, infrared detection is sent out to detect the overflowing slag at the furnace mouthMore signal Sinfra,more. For example, in the present embodiment, the threshold values TH1 and TH2 are set to 100 and 200, respectively.
And S102, mounting a common industrial camera at the lower part of the steel tapping side of the converter, shooting a video under the converter, and judging the slag overflow condition under the converter during steel tapping by the secondary computer according to the video.
And a common industrial camera is arranged at the lower part of the steel tapping side of the converter to shoot a video below the converter. The video shot by the camera can be used for detecting the steel flow condition at the steel tapping hole on one hand, and can also be used as a supplement of an infrared camera to observe the overflow condition of the steel slag from the furnace mouth on the other hand. Because the steel tapping side of the converter is provided with the fireproof door, the infrared camera cannot completely shoot the whole fire hole under the shielding of the fireproof door, and sometimes the steel slag overflows from the side edge of the fire hole, and the infrared camera cannot detect the steel slag. But the overflowed steel slag falls below the furnace and can be detected by a camera below the furnace.
The secondary computer generates two Boolean quantity signals according to the quantity of the overflowing slag detected by the video shot by the camera and sends the two Boolean quantity signals to the PLC, and similarly, two threshold values TH3 and TH4 are set, wherein TH4>TH3, if the slag overflow quantity exceeds TH3, a slag overflow signal S under the furnace is sent outcam,nor(ii) a If the quantity of the slag overflowing exceeds TH4, a signal S of more slag overflowing below the furnace is sentcam,more. For example, in the present embodiment, threshold values TH 3-120 and TH 4-230 are set.
And step S20, processing the slag overflow signal detected at the furnace mouth and the slag overflow signal detected under the furnace, and generating slow furnace lifting and fast furnace lifting instructions. The method specifically comprises the following steps:
step S201, processing a slag overflow signal detected at a furnace mouth to generate a furnace lifting instruction.
When the infrared detects the slag overflow signal S of the furnace mouthinfra,norAt the time of change to 1, the furnace-lifting operation does not need to be carried out immediately, since this may only be a small amount of steel slag that overflows occasionally, and may not be disposed of. Setting a timer T1When S isinfra,norIs 1 for T1After the duration, a slow furnace lifting instruction C is sentslow,rise. And if the number of the overflowing slag at the furnace mouth is more than the signal S of the infrared detection furnace mouthinfra,more1, no delay is needed, andsend out a rapid furnace lifting instruction Cfast,rise. In the present embodiment, T is set1＝2s。
And S202, processing the slag overflow signal detected under the furnace to generate a furnace lifting instruction.
When the slag overflow signal S of the furnace mouth is detected under the furnacecam,norWhen the temperature is changed to 1, the furnace lifting operation is not required to be carried out immediately, and a timer T is arranged2When S isinfra,norIs 1 for T2After a certain time (considering the time delay of slag overflow detection signal under the furnace, T is set2<T1. ) Sending out slow furnace lifting instruction Cslow,rise. And if the number of the slag overflowing from the furnace mouth is more than the number of the slag overflowing signals S under the furnacecam,more1, a rapid furnace lifting instruction C is directly sent out without time delayfast,rise. In the present embodiment, T is set2＝0.5s。
And step S30, when the converter is in a waiting state, the converter is controlled to be lifted upwards after receiving the converter lifting instruction, the converter is not lifted any more within a certain time after being lifted once, and the converter is pressed downwards after delaying for a period of time after being lifted. The method specifically comprises the following steps:
and step S301, after receiving a furnace lifting instruction when the converter is in a waiting state, controlling the converter to lift.
In the tapping process, the converter runs according to a set inclination angle schedule, and two states can exist. Firstly, after the step is finished, the internal contracting brake is released, the internal contracting brake is pressed down in the next step, the state is called a pressing-down state, the duration of the state is not long, and the duration is generally within 3 s; the second is a state of waiting for a specified duration after the set inclination is reached, and this state is called a waiting state. If the furnace lifting instruction is received in the pressing state, the furnace lifting operation is not executed. And only when the converter is in a waiting state, the received furnace lifting instruction is valid, and the furnace lifting operation is carried out according to the furnace lifting instruction at the moment.
Receiving a slow furnace lifting instruction C when the converter is in a waiting stateslow,riseThen, a slower upward speed S is setslowAnd for a period of time Trise,1. For example, in the present embodiment, if a slow furnace-lifting command is received, the rotation speed and tilting speed are given as Sslow0.9, onTime Trise,1＝2.5s。
Receiving a rapid furnace lifting instruction C when the converter is in a waiting statefast,riseThen, a faster upward speed S is setfastAnd for a longer period of time Trise,2Thereby forming a larger inclination angle and preventing the slag from overflowing from the furnace mouth. For example, in the present embodiment, if a rapid furnace lifting command is received, the tilting speed of the converter is given as Sfast1.2, duration Trise,2＝3.5s。
In the case of a slow furnace lifting, if a fast furnace lifting signal is received, the tilting speed of the converter is immediately set to SfastThe duration was shortened to 2.5 s. This is because the converter tilting system has a band-type brake, and the band-type brake needs to be opened first each time the tilting system starts, which usually takes about 1s, and if the converter has already started tilting and receives a fast furnace-lifting signal, the duration of the fast furnace-lifting needs to be shortened by 1 s.
And step S302, triggering a timer after the furnace is lifted, wherein the furnace cannot be lifted again in the time.
A timer T is triggered at the same time of furnace lifting3In the present embodiment, a timer T is set3The time is 10s, and the furnace cannot be lifted again during the running time of the timer. That is, within 10s after the start of the furnace lifting, if the furnace lifting instruction is received again, the furnace lifting action is not triggered (the fast furnace lifting instruction is received in the slow furnace lifting process and is effective, and other furnace lifting instructions are invalid after receiving multiple times). This is to prevent the continuous furnace lifting, which may cause too much lifting angle, resulting in low molten steel level and overflow of steel slag from the steel outlet.
Step S303, a timer is triggered after the lifting, and the pressure is pressed down to the original set inclination angle after the timer is lifted.
The lifting operation is completed after 2.5s or 3.5s, and in most cases, no slag overflow signal exists, so that the converter needs to be pressed down to the original set inclination angle. In order to avoid overflowing slag again after pressing down, so that the pressing down is not started immediately, a timer T is arranged4In this case, 6s, i.e. lift-offAfter 6s, the converter starts to be pressed down to the original set inclination angle.
And after the converter is pressed down to the original set inclination angle, the original tapping step is continuously executed, so that one-time furnace lifting operation is completely executed. Through the treatment, the slag overflowing situation in the converter tapping process is greatly improved, and the automation degree and the intelligent level in the tapping process are improved.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or any other related technical fields, are intended to be covered by the scope of the present invention.
Claims (9)
1. An automatic furnace lifting control method in the converter tapping process is characterized by comprising the following steps:
step S10, judging the slag overflow condition of the converter mouth during tapping according to the first video of the converter mouth, and generating a slag overflow signal for the converter mouth; judging the slag overflow condition under the converter during tapping according to the second video under the converter to generate a slag overflow detection signal under the converter;
step S20, processing a slag overflow signal detected at the furnace mouth and a slag overflow signal detected under the furnace to generate a furnace lifting instruction;
step S30, when the converter is in a waiting state, receiving a converter lifting instruction, controlling the converter to lift upwards, not lifting any more within a certain time after once lifting, and pressing downwards after delaying a period of time after lifting to a set inclination angle before lifting; the waiting state is a static state that the converter works at a set inclination angle.
2. The automatic furnace lifting control method of claim 1, wherein in step S1, the furnace mouth detection slag overflow signal comprises a first furnace mouth detection slag overflow signal and a second furnace mouth detection slag overflow signal, and when it is recognized that the furnace mouth slag quantity is greater than a first threshold value and less than a second threshold value, the first furnace mouth detection slag overflow signal is given; when the furnace mouth slag quantity is larger than a second threshold value, a second furnace mouth detection slag overflow signal is given; wherein the first threshold is less than the second threshold; the furnace lifting instruction comprises a slow furnace lifting instruction and a fast furnace lifting instruction;
in step S2, processing the slag overflow signal detected at the furnace mouth to generate a furnace lifting command, specifically including: and generating a slow furnace lifting instruction according to the first furnace mouth detection slag overflow signal, and generating a fast furnace lifting instruction according to the second furnace mouth detection slag overflow signal.
3. The automatic furnace lifting control method of claim 1, wherein in step S1, the under-furnace slag detection overflow signal includes a first under-furnace slag detection overflow signal and a second under-furnace slag detection overflow signal, and when it is recognized that the under-furnace slag amount is greater than a third threshold and less than a fourth threshold, the first under-furnace slag detection overflow signal is given; when the number of the slag under the furnace is identified to be larger than a fourth threshold value, a second slag overflow detection signal under the furnace is given; wherein the third threshold is less than the fourth threshold; the furnace lifting instruction comprises a slow furnace lifting instruction and a fast furnace lifting instruction;
in step S2, detecting a slag overflow signal under the furnace, and generating a furnace lifting command, specifically including: and generating a slow furnace lifting instruction according to the slag overflow signal detected under the first furnace, and generating a fast furnace lifting instruction according to the slag overflow signal detected under the second furnace.
4. The automatic converter lifting control method according to claim 2 or 3, wherein the method for controlling the lifting of the converter after receiving the converter lifting command while the converter is in the waiting state in step S30 is:
when the converter is in a waiting state, receiving a slow furnace lifting instruction, lifting the converter according to a set first lifting speed, and continuing for a first furnace lifting time;
when the converter is in a waiting state, receiving a rapid furnace lifting instruction, lifting the converter according to a set second lifting speed, and continuing for a second furnace lifting time;
wherein the first lift-up velocity is less than the second lift-up velocity.
5. The automatic furnace lifting control method of claim 4, wherein the furnace lifting is not performed within a certain time after the last lifting in step S30, and there are exceptions: and when a rapid furnace lifting signal is received in the slow furnace lifting process, immediately executing a rapid furnace lifting instruction, and simultaneously shortening the second furnace lifting time by a fixed time length.
6. The automatic furnace lifting control method of claim 1, wherein the step S30 is that the furnace is not lifted for a certain time after the last lifting, and the furnace is pressed down after the last lifting is delayed for a certain time, and the furnace is pressed down to the set inclination angle before the last lifting by:
triggering a first timer and a second timer at the same time of furnace lifting, and not accepting a new furnace lifting instruction within the running time of the first timer and not lifting the furnace again;
after the furnace lifting is finished, the converter keeps the current inclination angle until the timing of the second timer is finished;
and after the timing of the second timer is finished, pressing the converter downwards to a set inclination angle before the converter is lifted upwards.
7. The automatic furnace lifting control method of claim 1, wherein the first video in step S10 is an infrared video, the converter, the molten steel and the slag are distinguished according to temperature information given by the infrared video, a slag overflow condition of the furnace mouth is judged when tapping, and a slag overflow signal for detecting the furnace mouth is generated.
8. The utility model provides a converter tapping control system, includes converter, buggy ladle, industrial computer, PLC controller, converter tilting frequency converter, converter tilting motor, its characterized in that still includes: a first camera and a second camera; the first camera is arranged at the higher position of the steel tapping side of the converter and is used for shooting a first video at the converter mouth of the converter; the second camera is arranged at the lower part of the steel tapping side of the converter and is used for shooting a second video below the converter; the industrial computer is used for executing the steps S10 and S20 in the automatic furnace lifting control method according to any one of claims 1 to 7, and the PLC is used for executing the steps S30 in the automatic furnace lifting control method according to any one of claims 1 to 7.
9. The converter tapping control system of claim 8, wherein the first camera is an industrial infrared camera and the second camera is an industrial color camera.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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