CN116516095A - Automatic tapping safety control method for converter - Google Patents
Automatic tapping safety control method for converter Download PDFInfo
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- CN116516095A CN116516095A CN202310328606.7A CN202310328606A CN116516095A CN 116516095 A CN116516095 A CN 116516095A CN 202310328606 A CN202310328606 A CN 202310328606A CN 116516095 A CN116516095 A CN 116516095A
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- 238000010079 rubber tapping Methods 0.000 title claims abstract description 88
- 238000000034 method Methods 0.000 title claims abstract description 37
- 229910000831 Steel Inorganic materials 0.000 claims description 30
- 239000010959 steel Substances 0.000 claims description 30
- 230000008569 process Effects 0.000 claims description 12
- 238000012790 confirmation Methods 0.000 claims description 7
- 230000009191 jumping Effects 0.000 claims description 4
- 230000001960 triggered effect Effects 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 abstract description 3
- 239000002893 slag Substances 0.000 description 18
- 238000001514 detection method Methods 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 7
- 230000000903 blocking effect Effects 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 238000007599 discharging Methods 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 235000008694 Humulus lupulus Nutrition 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a converter automatic tapping safety control method, when the converter automatically taps, various faults of a tilting encoder of the converter and a laser range finder of a ladle car are judged through a controller, the faults not only comprise faults of the tilting encoder and the laser range finder body, but also are judged by means of calculation deviation of rotating speeds of the tilting frequency converter of the converter and the ladle car frequency converter in a matching way.
Description
Technical Field
The invention relates to the field of automatic control of metallurgical steelmaking, in particular to a safety control method for automatic tapping of a converter.
Background
The automatic tapping technology refers to all equipment related to converter tapping, including a converter body, a ladle car, an alloy chute, a slag blocking mechanism and the like, and the equipment is associated according to a preset logic sequence, so that full-automatic control of a tapping process is realized, automatic smelting and tapping of the converter are basically realized in large-scale steel factories in the world at present, the smelting success rate is effectively improved, the smelting period is shortened, the yield and the quality are improved, the raw material consumption and the cost are reduced, the labor intensity of operators is greatly reduced, and only manual monitoring is needed in the automatic tapping process.
However, as the working environment of the converter and the buggy ladle is severe, the laser distance meter for positioning the buggy ladle is easy to break lines or break power failures, and meanwhile, foreign matters can also obstruct continuous measurement of the laser distance meter when passing through the buggy ladle running track or smoke, so that the buggy ladle is in automatic running control error, the problems that the buggy ladle breaks a control cable and the buggy ladle steel receiving position deviates can occur when the buggy ladle breaks, and serious production safety accidents such as steel splashing and the like can occur when the automatic tapping of the converter is not stopped in time; in addition, the tilting encoder cable of the converter can be fused at high temperature in long-term working, so that automatic tapping control errors of the converter occur, production safety accidents such as converter tilting and furnace mouth steel overflow occur, the reliability of automatic tapping is seriously affected by the problems, and the production safety is difficult to guarantee in the automatic tapping process.
Meanwhile, if the problems that the output value jumps or the speed of the buggy ladle is lower than the expected speed of a control system due to rail blockage and the like caused by blocking of the laser range finder frequently occur in the automatic tapping process, the control of the controller on the automatic tapping process can be influenced, the controller can not finish the automatic tapping process according to a preset program, and the production efficiency of automatic tapping is reduced.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a safety control method for automatic tapping of a converter.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the automatic tapping safety control method of the converter comprises the following steps:
s1: when the ladle car automatically walks, two laser distance measuring instruments are used for measuring distance, when the measured value of any one of the laser distance measuring instruments exceeds the maximum value, the controller gives an alarm, and when the difference value of the measured distances of the two laser distance measuring instruments is larger than a first threshold value, the controller gives an alarm;
s2: the controller calculates the theoretical distance L of the buggy ladle according to the rotating speed of the buggy ladle frequency converter, the controller subtracts L from the actual distance measured by the laser range finder and takes an absolute value to obtain a first error distance L1, when L1 is larger than a second threshold value, the buggy ladle continues to move for 0.1m or 0.5s, and after that, if L1 is still larger than the second threshold value, the controller gives an alarm;
s3: the buggy ladle moves to a steel receiving position, the controller subtracts the distance from the current moving distance that the buggy ladle arrives at the steel receiving position when tapping last time from the current moving distance and takes an absolute value to obtain a second error distance L2, when L2 is larger than a third threshold value, the controller gives an alarm, and if the difference between the current moving distance and the expected moving distance exceeds a seventh threshold value, the controller also gives an alarm;
s4: when the converter rotates, the controller alarms when the value measured by the tilting encoder exceeds a preset range, and the controller also alarms when the controller reads that the electric tilting speed of the converter is greater than 0 and the value measured by the tilting encoder is unchanged within a limited time;
s5: when the value measured by the tilting encoder of the converter is larger than a fourth threshold value in the process of tilting the converter backward, a proximity switch positioned at one side of the converter is triggered to send a confirmation signal to the controller, and if the tilting encoder does not receive the confirmation signal, the controller gives an alarm.
In the step S1, when the measured value of the laser range finder exceeds the maximum value, the controller is alerted to prevent the buggy ladle from breaking the control cable due to the longer driving distance;
step S2, the problem that the output value of the laser range finder jumps due to the fact that the laser range finder is blocked by pedestrians or vehicles suddenly can be solved, and the problem that the output value of the laser range finder remains unchanged when the buggy ladle runs due to the fact that the laser range finder is blocked by some object for a long time can be identified and solved;
step S3 is a protective measure for preventing the set value of the ladle car from being accidentally reset or the position of the ladle car from being changed;
step S4, the failure that the tilting encoder cannot respond can be identified, and meanwhile, the problem caused by the operation error of a control system is avoided;
step S5 is prepared for preventing inaccurate measurement results of the tilting encoder, and can avoid that the converter cannot rotate to a designated position in the automatic tapping process;
the invention judges various faults of the tilting encoder of the converter and the laser range finder of the buggy ladle through the controller, not only comprises the faults of the tilting encoder and the laser range finder body, but also judges the faults by means of the calculation deviation of the rotating speeds of the tilting frequency converter of the converter and the buggy ladle frequency converter in cooperation, can ensure that the whole system safely, timely and accurately exits from the automatic tapping state of the converter, has obvious effect, and is suitable for the design and application of the automatic tapping control system of the converter of the same kind;
meanwhile, the invention ensures the quality of molten steel tapped by the converter, acquires the parameters of automatic tapping of the converter and the equipment control parameters through various detection modes, can automatically treat partial faults such as output value jump and the like caused by blocking of the laser range finder, improves the automatic tapping efficiency and improves the safety performance of automatic tapping.
Preferably, the two laser rangefinders are divided into a main rangefinder and a secondary rangefinder, the controller preferentially adopts the numerical value of the main rangefinder as the actual distance, when the numerical value measured by the main rangefinder is smaller than 0.1m, the controller judges that the main rangefinder is disconnected or powered off, the controller adopts the numerical value of the secondary rangefinder as the actual distance, when the numerical values measured by the two laser rangefinders are smaller than 0.1m, the controller judges that the two laser rangefinders are disconnected or powered off, and the controller alarms.
Preferably, when the measured value of the primary range finder or the secondary range finder is smaller than 0.1m, the controller does not calculate the difference between the measured distances of the two laser range finders.
When the measurement result of the laser range finder is smaller than 0.1m, the laser range finder is broken or powered off, and the influence of the laser range finder with faults needs to be removed, so that automatic tapping of the converter can be continued.
Preferably, the controller records at least two values sent by each laser range finder continuously, if the difference value between the two values sent by the main range finder continuously is larger than a fifth threshold value, the controller judges that the value of the main range finder is obvious in jitter, the controller takes the value of the auxiliary range finder as an actual distance, and when the value of the two laser range finders are obvious in jitter, the controller gives an alarm.
Preferably, before the buggy ladle moves, when the difference value of the distances measured by the two laser distance measuring instruments is larger than a sixth threshold value, the controller alarms, and simultaneously the controller prohibits the converter from tapping automatically.
If the difference between the measured distances of the two laser rangefinders before the automatic tapping of the converter is greater than the sixth threshold, the laser directions of the two laser rangefinders are manually adjusted to change, so that the laser is not irradiated on the target object, or a certain laser rangefinder is blocked, so that the fault needs to be removed in advance, and the production process is not influenced by the fault again after the automatic tapping of the converter is started.
Preferably, the current moving distance in step S3 uses the actual distance.
Preferably, when the controller alarms, the controller will stop the automatic tapping of the converter.
The controller reminds operators responsible for monitoring and stops automatic tapping of the converter in time when faults are found, so that production safety accidents are avoided.
Preferably, the controller presets the expected moving distance of the buggy ladle within a specified time, when the buggy ladle automatic traveling time reaches the specified time, the controller compares the actual distance with the expected moving distance, and when the difference between the actual distance and the expected moving distance exceeds the seventh threshold, the controller gives an alarm.
The controller can find out the problem that the buggy ladle is blocked in a track or the laser of the laser range finder is not irradiated on the buggy ladle when the timing exceeds the theoretical time, and provides reference for subsequent overhaul.
Preferably, the controller adopts a PLC controller, fault information is sent to a human-computer interface of a main operation room when the controller alarms, and the laser irradiation directions of the two laser range finders are parallel to the moving direction of the ladle car.
Preferably, when the converter rotates to the tapping angle, the controller records the moving distance of the buggy ladle, and the buggy ladle reaches the steel receiving position at the moment.
And after the converter rotates to a tapping angle, tapping is started, wherein the position of the buggy ladle is the first position for receiving molten steel.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention judges various faults of the tilting encoder of the converter and the laser range finder of the buggy ladle through the controller, not only comprises faults of the tilting encoder and the laser range finder body, but also judges faults by means of the calculation deviation of the rotating speeds of the tilting frequency converter of the converter and the buggy ladle frequency converter in cooperation.
(2) The invention ensures the quality of molten steel tapped by the converter, acquires the parameters of automatic tapping of the converter and the equipment control parameters through various detection modes, can automatically treat partial faults such as output value jump and the like caused by blocking of the laser range finder, improves the automatic tapping efficiency and simultaneously improves the safety performance of automatic tapping.
Drawings
FIG. 1 is a schematic flow chart of the method of the present invention;
FIG. 2 is a schematic flow chart for judging whether the laser range finder itself has faults or not in the invention;
FIG. 3 is a schematic flow chart of comparing deviation of two laser rangefinders in the present invention;
FIG. 4 is a flow chart of determining whether the laser rangefinder value hops in the present invention;
FIG. 5 is a flow chart of the comparison of the steel connecting positions in the invention;
FIG. 6 is a flow chart of determining whether the ladle car position is within a limit range according to the present invention;
FIG. 7 is a flow chart of determining whether the tilt encoder is accurate according to the present invention;
FIG. 8 is a flow chart of the method for judging whether the inclination angle of the converter exceeds the limit in the invention.
Detailed Description
The following description of the embodiments of the present invention will be made more apparent and fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by one of ordinary skill in the art without undue burden on the person of ordinary skill in the art based on embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "middle", "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
As shown in fig. 1 to 8, the specific scheme of the embodiment is as follows: specifically, each difference value in the method is used for comparison when being compared with each threshold value respectively, the first threshold value in the embodiment is 5m, the second threshold value, the fifth threshold value and the seventh threshold value are all 0.1m, the third threshold value is 0.2m, the limiting time is 0.2s, the sixth threshold value is 0.7m, and the tapping angle is-78 degrees.
The automatic tapping safety control method of the converter comprises the following steps:
s1: when the ladle car automatically walks, the two laser distance measuring instruments measure the distance, when the measured value of any one laser distance measuring instrument exceeds the maximum value, the controller gives an alarm, and when the difference value of the measured distances of the two laser distance measuring instruments is more than 5m, the controller gives an alarm;
s2: the controller calculates the theoretical distance L of the buggy ladle according to the rotating speed of the buggy ladle frequency converter, the controller subtracts the actual distance L measured by the laser range finder and takes an absolute value to obtain a first error distance L1, when L1 is larger than 0.1m, the buggy ladle continues to move for 0.1m or 0.5s, and if L1 is still larger than 0.1m, the controller gives an alarm;
s3: the ladle car moves to a steel receiving position, the controller subtracts the distance from the current moving distance of the ladle car to the steel receiving position when tapping last time and takes an absolute value to obtain a second error distance L2, and when L2 is larger than 0.2m, the controller gives an alarm, and if the difference between the current moving distance and the expected moving distance exceeds a seventh threshold value, the controller gives an alarm;
s4: when the converter rotates, the controller alarms when the value measured by the tilting encoder exceeds a preset range, and the controller also alarms when the controller reads that the electric rotating speed of the tilting of the converter is greater than 0, if the value measured by the tilting encoder is unchanged within 0.2 s;
s5: in the process of tilting the converter backwards, when the value measured by the tilting encoder of the converter is larger than a fourth threshold value, a proximity switch positioned at one side of the converter is triggered to send a confirmation signal to the controller, and if the tilting encoder does not receive the confirmation signal, the controller gives an alarm.
Specifically, the buggy ladle moves along the track, the laser rangefinder and the track parallel arrangement, the laser irradiation direction of two laser rangefinders is parallel with the direction of movement of buggy ladle, and the laser that two laser rangefinders launched can both shine on the buggy ladle.
Specifically, the proximity switch is a switch type sensor, which has the characteristics of a travel switch and a micro switch and has sensing performance, when the proximity switch of the converter approaches the sensing area of the switch type sensor, the proximity switch can be in non-contact, pressure-free, spark-free and rapidly send an electrical instruction to the controller, the position and travel of a converter movement mechanism are accurately reflected, and the sensing range of the proximity switch used in the embodiment is-65 degrees+/-0.1 degrees, so that the fourth threshold value is-65 degrees to 0.1 degrees.
Specifically, the maximum value of the laser range finder is 50m, and the preset range of the tilting encoder is less than or equal to 30 degrees and more than or equal to-105 degrees.
Specifically, the two laser rangefinders are divided into a main rangefinder and an auxiliary rangefinder, the controller preferentially adopts the numerical value of the main rangefinder as an actual distance, when the numerical value measured by the main rangefinder is smaller than 0.1m, the controller judges that the main rangefinder is disconnected or powered off, the controller adopts the numerical value of the auxiliary rangefinder as the actual distance, when the numerical values measured by the two laser rangefinders are smaller than 0.1m, the controller judges that the two laser rangefinders are disconnected or powered off, and the controller gives an alarm.
Specifically, when the measured value of the main range finder or the auxiliary range finder is smaller than 0.1m, the controller does not calculate the difference value of the measured distances of the two laser range finders.
Specifically, the controller records the numerical value sent by each laser range finder at least twice continuously, if the difference value between the numerical values sent by the main range finder twice continuously is larger than 0.1m, the controller judges that the numerical value of the main range finder is obvious in jitter, the controller takes the numerical value of the auxiliary range finder as an actual distance, and when the numerical value of the two laser range finders is obvious in jitter, the controller gives an alarm; even if the numerical value of the main range finder or the auxiliary range finder is obvious in jumping, the execution of the step S1 is not affected, and the automatic walking of the buggy ladle is still normally carried out as long as the difference value of the measured distances of the two laser range finders is smaller than 5 m.
Specifically, before the buggy ladle moves, when the difference of the measured distances of the two laser distance measuring devices is larger than 0.7m, the controller gives an alarm, and simultaneously the controller prohibits the buggy ladle from automatically walking and prohibits the converter from automatically tapping.
Specifically, the controller converts the running speed of the buggy ladle according to the rotating speed of the buggy ladle frequency converter, and then estimates L according to the buggy ladle running time recorded by the controller.
Specifically, in step S3, the actual distance is used as the current moving distance.
Specifically, when the controller alarms, the controller stops the ladle car from automatically walking and the converter from automatically tapping.
Specifically, the controller presets the predicted moving distance of the buggy ladle in the specified time, when the automatic walking time of the buggy ladle reaches the specified time, the controller compares the actual distance measured by the laser range finder with the predicted moving distance, and when the difference between the actual distance and the predicted moving distance exceeds 0.1m, the controller gives an alarm.
Specifically, when the converter rotates to-78 degrees, the controller records the moving distance of the ladle car, and at the moment, the ladle car reaches a steel receiving position, wherein the steel receiving position refers to a preset position of the ladle car for receiving molten steel.
Specifically, the controller adopts an S7-400PLC controller, fault information is sent to a human-computer interface of a main operation room when the controller alarms, a converter tilting system is an S120 system, the power of a converter tilting motor is 160kW, the band-type brake power of the converter tilting motor is 0.45kW, a tilting encoder is arranged on the side of the converter tilting motor to detect the tilting angle of the converter, the detection precision is 0.1 DEG, and the tilting encoder is connected with the controller; the ladle trolley running system is controlled by a controller.
Specifically, the tapping hole of the converter is provided with a slag-off detection device, slag inclusion detection during tapping of the converter can be realized, the detection precision can reach more than 98%, and related signals of the slag-off detection device are connected with a control system.
Specifically, the automatic tapping step of the converter is as follows:
(1) After finishing blowing of the oxygen lance, the control system confirms that the automatic tapping condition of the converter is met, then sends out an automatic tapping prompt of the converter, and presses an automatic tapping button of the converter after manual reconfirmation;
(2) Calculating a tapping angle and a steel receiving position corresponding to the tapping angle according to the converter molten iron loading amount and a furnace type measuring result, wherein the laser range finder is used for measuring the actual position of the ladle car, and the control system controls the ladle car to automatically move to the steel receiving position for receiving molten steel;
(3) The converter tilts backward, meanwhile, the infrared detection device of the furnace mouth detects the state in the furnace, whether abnormal conditions exist in the furnace or not is judged through an image recognition technology, if a great amount of foam slag and the like exist in the furnace, the converter tilts to a tapping angle if no abnormal state exists, otherwise, the controller alarms and stops automatic tapping of the converter;
(4) After the converter reaches the tapping angle, opening the tapping hole, enabling molten steel to flow out of the tapping hole, starting the tapping process, automatically setting a preset value of a tilting angle of the converter at the moment, and finely adjusting the preset value according to the width of a steel flow and the slag discharging condition detected by slag discharging and the slag discharging condition of the furnace hole detected by an infrared detection device of the furnace hole;
(5) And coupling control is carried out on the distance and the rocking angle of the buggy ladle in a sectional mode. Continuously and automatically adjusting the distance of the ladle car according to the pouring angle and the feedback data of the steel flow centering detection device, so that molten steel smoothly flows into the ladle;
(6) Automatically adding alloy into the ladle;
(7) When the tilting angle reaches the tapping end angle and the slag content exceeds a preset value, the slag blocking system starts to work, the tapping hole is rapidly blocked, and the tilting system rapidly tilts the converter back to 0 degrees;
(8) The ladle car leaves the tapping position and automatically moves to an argon blowing position, and the slag car moves to a slag discharging position;
(9) After the manual confirmation of the start of the slag pouring flow, slag pouring operation is carried out according to a preset slag pouring tilting angle, and the slag car and the converter tilt in linkage to ensure that slag is smoothly poured into a slag pot from a furnace mouth;
(10) After the slag flow on-line detection device detects that no slag flows out, the tilting system tilts the converter back to 0 degrees.
Furthermore, the whole process of automatic tapping of the converter is realized mainly by controlling the ladle car to automatically walk and controlling the converter to automatically rotate, and the following problems can be avoided by the automatic tapping safety control method of the converter:
a: in the step 1 of automatic tapping of the converter, laser emitted by two laser rangefinders may not irradiate a target object or a certain laser rangefinder is blocked, at the moment, the controller cannot obtain the accurate position of the ladle car, and the ladle car cannot be ensured to safely move after the automatic tapping of the converter begins, in the method, whether the problem is caused or not is determined by determining whether the difference value of the measured distances of the two laser rangefinders is larger than 0.7m, so that the controller can obtain the accurate position of the ladle car;
b: in the steps 2, 5 and 8 of automatic tapping of the converter, the laser rangefinder is easy to break lines or break power failures, at the moment, the numerical value sent to the controller by the broken lines or break power laser rangefinder is less than 0.1m, meanwhile, the laser rangefinder is also easy to jump by the measured numerical value caused by the obstruction of the foreign matters or smoke of the running rail of the steel ladle car, the method adopts a standby mode, the controller is used for identifying the broken lines or the jumping laser rangefinder, the other standby laser rangefinder is started to continuously provide the accurate position of the steel ladle car for the controller, and the step S2 is used for carrying out supplementary correction, so that the standby laser rangefinder is prevented from being continuously measured by the obstruction of the foreign matters or smoke of the running rail of the steel ladle car, and the production safety is ensured while the automatic tapping of the converter can be continued;
c: in the steps 2, 5 and 8 of automatic tapping of the converter, the ladle car can have the problem that the cable connected with the ladle car is broken due to the long driving distance, and the ladle car can be prevented from exceeding a specified range by the step S1;
d: in the steps 2, 5 and 8 of automatic tapping of the converter, the output value of the laser range finder is kept unchanged when the ladle car runs due to the fact that the laser range finder is possibly shielded by a certain object for a long time, the method can determine whether the problem occurs or not through the step S2, after confirming that the problem occurs, the method uses the theoretical distance L to control the short time or the short distance, if the deviation between the estimated value and the measured value is restored to a reasonable range within the short time or the short distance, the control can be continued through the laser range finder, the situation that the normal movement of the ladle car is influenced only by the numerical jump of the laser range finder is avoided, meanwhile, because the laser range finder is arranged parallel to the track of the ladle car, if the deviation between the estimated value and the measured value still exceeds the reasonable range within the short time or the short distance, people or foreign matters are likely to stop on the track of the ladle car at the moment, and the controller alarms and stops the ladle car, so that safety accidents are avoided;
e: in the steps 2, 5 and 8 of automatic tapping of the converter, the set value of the ladle car position stored by the controller can be reset accidentally, meanwhile, the problem that the position of the ladle car is changed and the position of the ladle car stored by the controller is not changed exists, and the automatic tapping of the converter is executed at the moment, so that the problem that whether the tapping of the converter occurs easily can be judged through the step S3, the converter can be prevented from continuously tapping after the problem occurs, and the steel splashing is avoided;
f: in the steps 2, 5 and 8 of automatic tapping of the converter, the ladle car cannot reach a set position in a specified time due to uneven track or insufficient motor output of the ladle car, so that the automatic tapping efficiency of the converter is affected, meanwhile, due to the problems, the step S3 possibly causes the steel receiving position stored by the controller to approach to the same direction each time after multiple execution, and accumulated errors are generated;
g: in the steps 3, 4, 5, 7, 9 and 10 of automatic tapping of the converter, the problems that the measurement result of the tilting encoder is inaccurate and has deviation with the actual situation easily occur, and serious accidents such as converter tilting, converter overflow and the like are caused when the problems are serious;
h: in the steps 3, 4, 5, 7, 9 and 10 of automatic tapping of the converter, the problem that a tilting encoder is unresponsive due to cable fusing or self-fault easily occurs;
i: in the steps 3, 4, 5, 7, 9 and 10 of automatic tapping of the converter, the control system may have errors or the system has problems that the running direction of the converter set by the system is opposite to the actual running direction, and the like, and the problems easily cause the measurement value of the tilting encoder to exceed the limit.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The automatic tapping safety control method for the converter is characterized by comprising the following steps of:
s1: when the ladle car automatically walks, two laser distance measuring instruments are used for measuring distance, when the measured value of any one of the laser distance measuring instruments exceeds the maximum value, the controller gives an alarm, and when the difference value of the measured distances of the two laser distance measuring instruments is larger than a first threshold value, the controller gives an alarm;
s2: the controller calculates the theoretical distance L of the buggy ladle according to the rotating speed of the buggy ladle frequency converter, the controller subtracts L from the actual distance measured by the laser range finder and takes an absolute value to obtain a first error distance L1, when L1 is larger than a second threshold value, the buggy ladle continues to move for 0.1m or 0.5s, and after that, if L1 is still larger than the second threshold value, the controller gives an alarm;
s3: the buggy ladle moves to a steel receiving position, the controller subtracts the distance from the current moving distance that the buggy ladle arrives at the steel receiving position when tapping last time from the current moving distance and takes an absolute value to obtain a second error distance L2, when L2 is larger than a third threshold value, the controller gives an alarm, and if the difference between the current moving distance and the expected moving distance exceeds a seventh threshold value, the controller also gives an alarm;
s4: when the converter rotates, the controller alarms when the value measured by the tilting encoder exceeds a preset range, and the controller also alarms when the controller reads that the electric tilting speed of the converter is greater than 0 and the value measured by the tilting encoder is unchanged within a limited time;
s5: when the value measured by the tilting encoder of the converter is larger than a fourth threshold value in the process of tilting the converter backward, a proximity switch positioned at one side of the converter is triggered to send a confirmation signal to the controller, and if the tilting encoder does not receive the confirmation signal, the controller gives an alarm.
2. The automatic tapping safety control method for a converter according to claim 1, wherein two laser rangefinders are divided into a main rangefinder and an auxiliary rangefinder, the controller preferentially adopts the numerical value of the main rangefinder as the actual distance, the controller judges that the main rangefinder is disconnected or powered off when the numerical value measured by the main rangefinder is smaller than 0.1m, the controller adopts the numerical value of the auxiliary rangefinder as the actual distance, and the controller judges that the two laser rangefinders are disconnected or powered off when the numerical values measured by the two laser rangefinders are smaller than 0.1m, and the controller alarms.
3. The method according to claim 2, wherein the controller does not calculate the difference between the measured distances of the two laser rangefinders when the measured value of the primary or secondary rangefinder is less than 0.1 m.
4. The method for safely controlling automatic tapping of a converter according to claim 2, wherein the controller records at least two values sent by each laser range finder continuously, if the difference between the two values sent by the main range finder continuously is larger than a fifth threshold value, the controller judges that the value of the main range finder is obvious in jumping, the controller takes the value of the auxiliary range finder as an actual distance, and when the value of the two laser range finders are obvious in jumping, the controller gives an alarm.
5. The method for safely controlling automatic tapping of a converter according to claim 1, wherein before the buggy ladle moves, when the difference between the distances measured by the two laser rangefinders is greater than a sixth threshold, the controller will give an alarm, and the controller will prohibit automatic tapping of the converter.
6. The method according to claim 1, wherein the actual distance is used for the moving distance in step S3.
7. A method of safety control of automatic tapping of a converter according to claim 1, characterized in that the controller stops automatic tapping of the converter when the controller alarms.
8. The method according to claim 1, wherein the controller presets the estimated movement distance of the ladle car within a predetermined time, compares the actual distance with the estimated movement distance when the ladle car automatically walks for the predetermined time, and alarms when a difference between the actual distance and the estimated movement distance exceeds the seventh threshold.
9. The automatic tapping safety control method for the converter according to claim 1, wherein the controller adopts a PLC controller, fault information is sent to a human-computer interface of a main operation room when the controller alarms, and laser irradiation directions of the two laser range finders are parallel to the moving direction of the ladle car.
10. The method according to claim 1, wherein the controller records the moving distance of the buggy ladle when the converter rotates to the tapping angle, and the buggy ladle reaches the tapping position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310328606.7A CN116516095A (en) | 2023-03-30 | 2023-03-30 | Automatic tapping safety control method for converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310328606.7A CN116516095A (en) | 2023-03-30 | 2023-03-30 | Automatic tapping safety control method for converter |
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| CN202310328606.7A Pending CN116516095A (en) | 2023-03-30 | 2023-03-30 | Automatic tapping safety control method for converter |
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