CN103272863A - Method and system for automatically controlling heavy plate mill to accurately remove scales - Google Patents
Method and system for automatically controlling heavy plate mill to accurately remove scales Download PDFInfo
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- CN103272863A CN103272863A CN 201310251272 CN201310251272A CN103272863A CN 103272863 A CN103272863 A CN 103272863A CN 201310251272 CN201310251272 CN 201310251272 CN 201310251272 A CN201310251272 A CN 201310251272A CN 103272863 A CN103272863 A CN 103272863A
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- steel plate
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- scale removing
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Abstract
The invention discloses a method for automatically controlling a heavy plate mill to accurately remove scales. The method is characterized by comprising the following steps of (1) establishing a fitting relation curve of a timing position S0 of a steel plate starting to enter the mill and a head position S1 of the steel plate when a scale removing injection valve is opened; (2) communicating with a transporting roller way transmission control system to obtain a speed value for position calculation, and determining the timing position S0 of the steel plate starting to enter the mill and an actual position S of the steel plate in combination with the steel plate head position detected by a thermal detection device; (3) calling the determined fitting relation curve, and comparing position points determined according to the fitting relation curve with the actual position of the steel plate to determine a time point for opening the scale removing valve; and (4) communicating with a mill controlling system to send out a signal of opening the scale removing valve, and determining switching of the scale removing valve according to original chain conditions on site by the mill controlling system.
Description
Technical field
The present invention relates to slab finishing mill technique of scale removal field, specifically, relate to the accurate de-scaling autocontrol method of a kind of heavy plate mill and control system.
Background technology
In the heavy plate mill rolling process, the high-pressure water descaling process is the key link that influences surface of steel plate, the many employings of the de-scaling of milling train control at present are manual or automatically simple, there is the control inaccuracy in manual operation, water spraying time is long, and randomness is bigger, cause the production water consumption big, operate misses such as spray are leaked in wrong spray, influence product quality, and conventional simple control automatically then exists the switching that only depends on heat inspection and time-delay control de-scaling valve, control accuracy is not enough, the rich amount of water spray is excessive, causes the waste of production water or the transition of de-scaling water to consume, and this present situation is not inconsistent with the strong request of iron and steel enterprise's cost efficiency energy-conserving and environment-protective at present.
Summary of the invention
The technical problem to be solved in the present invention provides the accurate de-scaling autocontrol method of a kind of heavy plate mill and control system, determines the best switch Scale removing valve time, reaches the optimum efficiency of steel plate de-scaling, saves a large amount of industrial waters.
The present invention adopts following technical scheme to realize goal of the invention:
The accurate de-scaling autocontrol method of a kind of heavy plate mill is characterized in that, comprises the steps:
Position S on opportunity when (1) setting up steel plate and begin to enter milling train
0The head position S of steel plate when opening with the de-scaling injection valve
1The match relation curve;
(2) by with the communication of conveyor roller driving control system, the acquisition speed value is carried out position calculation, the position S on opportunity when the steel plate head position of detecting in conjunction with heat detecting device is used for determining that steel plate begins to enter milling train
0Physical location S with steel plate;
(3) call determined match relation curve, according to the determined location point of match relation curve, compare with actual steel plate position, determine to open the time point of Scale removing valve;
(4) with the mill control system communication, send and open the Scale removing valve signal, mill control system is determined the switching of dephosphorization valve according to the original chain condition in scene.
As the further restriction to the technical program, described step (3) comprises the steps:
Position S on opportunity when (3.1) beginning to enter milling train according to the steel plate that obtains
0, the head position S of steel plate when in the match relation curve, finding corresponding de-scaling injection valve to open
1
(3.2) the physical location S of steel plate and head position S
1Compare, when
The time, send the control signal that the de-scaling injection valve is opened;
The accurate de-scaling automatic control system of a kind of heavy plate mill is characterized in that, comprising:
PLC control system: finish the physical location analysis of steel plate, determine the appropriate opportunity that Scale removing valve is opened based on this analysis;
Conveyor roller driving control system: control the speed of conveyor roller motor, and voltage signal is fed back to the PLC control system, finish the detection of conveyor roller speed;
Mill control system: carry out the switch Scale removing valve signal that the PLC control system is sent, determine the switching of dephosphorization valve according to the original chain condition in scene;
Steel plate head detection system: demarcate the steel plate head position, determine the physical location of steel plate.
As the further restriction to the technical program, described PLC control system comprises:
Match relation curve module: the position S on opportunity when foundation and storage steel plate begin to enter milling train
0The head position S of steel plate when opening with the de-scaling injection valve
1The match relation curve;
Steel plate actual calculation of location module: by with conveyor roller transmission control communication, the acquisition speed value is carried out position calculation, the position S on opportunity when determining that steel plate begins to enter milling train is believed in the steel plate head position of detecting in conjunction with heat detecting device
0Physical location S with steel plate;
Time point determination module: call determined match relation curve, according to the determined location point of match relation curve, compare with actual steel plate position, determine to open the time point of Scale removing valve;
Switch Scale removing valve control module: after arriving the time point of switch Scale removing valve, with the mill control system communication, send switch Scale removing valve signal, mill control system is determined the switching of dephosphorization valve according to the original chain condition in scene.
Compared with prior art, advantage of the present invention and good effect are: the present invention can control according to the physical location for the treatment of the de-scaling steel plate, and calculate according to the switching characteristic of Scale removing valve, determine the best controlled valve time, reach the optimum efficiency of steel plate de-scaling, save a large amount of industrial waters.The present invention has significantly improved the control accuracy of milling train high-pressure water descaling, has not only guaranteed accurate phosphor-removing effect, has more significantly reduced the consumption of de-scaling water, has reached the purpose of saving water and energy.
Description of drawings
Fig. 1 constitutes block diagram for the system of invention.
Fig. 2 is the schematic diagram of steel plate motion of the present invention with the de-scaling position.
Fig. 3 is de-scaling of the present invention position matched curve.
The specific embodiment
Below in conjunction with accompanying drawing and preferred embodiment the present invention is done further to describe in detail.
Referring to Fig. 1, Fig. 2 and Fig. 3, the accurate de-scaling automatic control system of a kind of heavy plate mill of the present invention, its core is the PLC control system, comprises that also Communication Control finishes corresponding function.
Described PLC controller core task is to finish the position analysis of steel plate, determines the appropriate opportunity that Scale removing valve opens and closes based on this analysis.
Position S on opportunity when (1) setting up steel plate and begin to enter milling train
0The head position S of steel plate when opening with the de-scaling injection valve
1The match relation curve;
As shown in Figure 2, for the ease of analyzing, we set up a coordinate system earlier, and displacement S and speed v are vector, and for just, finishing mill frame central line position is 0 meter with the rolling line direction.Suppose S
0Be the initial position that begins to accelerate before of nipping, S
1Be de-scaling injection valve enable possition, S
2It is the position that water under high pressure is sprayed onto head just.
Table 1 position analysis argument table
Variable in the table 1,
S is the real time position of steel plate head;
S
0Position on opportunity when beginning to enter milling train for steel plate, the PLC controller can calculate this position according to speed feedback;
S
1The head position of steel plate when opening for the de-scaling injection valve is exactly the numerical value that we will calculate, and controls the state of injection valve by the comparison of it and S;
S
2Be a definite value position, with the setting angle of hydraulic spray and relation is highly arranged;
S
TFor steel plate accelerates to finish head position when entering at the uniform velocity;
v
TFor the technology biting speed, generally do not change, be the maximum speed before steel plate is nipped;
t
2-t
1For steel plate from S
1Arrive S
2The time that needs, why consider that this time difference is because the injection valve action exists delay, desirable hydraulic pressure to set up the communication delay that needs time and system, be in order to make water under high pressure be sprayed onto steel plate head just, to reach desirable scale removal effect.For same set of equipment, this value is a definite value.
A is the steel plate acceleration, does not generally change.
The accelerator analysis of steel plate:
Steel plate was in the low speed state of going around before milling train is nipped, this moment, speed was v0, and the process of nipping of steel plate just can be considered as after the acceleration earlier process at the uniform velocity.Suppose
Steel plate displacement when finishing for acceleration,
In the production process of reality, because the needs of Processes and apparatus cooling, the position and uncertain of going around of steel plate can be in the milling train center line position of 5-15 rice before, the position at steel plate head place when basis reaches at the uniform velocity like this.
Can find S by analyzing
1Be S
0, S
2, v
0, v
T, a, t
2-t
1Function, have
For the system of a stable operation, S
2, v
0, v
T, a, t
2-t
1All be constant, formula can be reduced to
Further analysis can be found a trend, S
0The frame center line of disembarking is more far away, S
1The position frame center line of disembarking is more far away, i.e. S
0Be worth more little, S
1Be worth more little, but S
1A minimum of a value is arranged, and this minimum of a value betides in first kind of situation.
And in practical application, estimate to calculate S
1Value, with real time position S and the S of steel plate
1Compare in real time, when
The time, system's control de-scaling injection valve is opened.Because
Condition restriction, so must have
Namely as steel plate head position S
0The close enough frame central then must have
This means that in the place of close enough frame when stinging steel order arrival, the de-scaling injection valve must be opened simultaneously could guarantee to be sprayed onto steel plate head.
When control de-scaling injection valve cuts out, service condition
Wherein S' is steel plate afterbody real time position.The steel plate afterbody has just been finished the de-scaling process and just can have been carried out closing motion at once like this.
Owing under the condition, do not have condition accurately to measure S at the scene
2, t
2-t
1, and the biting speed v of system
T, acceleration a uses definite value, initial velocity v
0Less can be considered
In order to simplify quantitative process, we have adopted another computational methods that is different from the mathematical function model: matched curve simultaneously.
As shown in Figure 2, the S by position that difference is gone around
0With S
1Take a sample, choose the sample data of 21 perfect de-scalings, simulate a S
1With S
0Relation curve.
This curve has comprised before the machine behind machine, behind the machine before the machine both direction S
1With S
0Relation, transverse axis is S
0The position is apart from the distance of frame central 151.91, and the longitudinal axis is S
1The position is apart from the distance of frame central 151.91.Find except S by Fig. 2
1There is beyond the minimum of a value S
1Also there is critical point, before this point, has
After this point, have
When control de-scaling injection valve cuts out, directly used
(behind the machine be
), this autocontrol method is than operative employee's manual-lock injection valve after throwing steel, and generally can shift to an earlier date 1-2 closes the de-scaling injection valve second, has the effect of better saving water and energy.
(2) finish the control of PLC control system
Determine after the matched curve that the corresponding function of PLC is finished in programming, in this example, PLC adopts Siemens's 200 series of PLC.Carry out communication with the roller-way transmission system by Profibus, obtain velocity amplitude, carry out communication with mill control system simultaneously, send the de-scaling sign on.The scene arranges the heat detecting device of demarcating the steel plate head position simultaneously, determines the physical location of steel plate.
PLC also has according to different valve characteristics, demarcates the function of matched curve, namely when the replacing valve recomputates matched curve, by corresponding function, finishes the calculating of matched curve automatically.
Following execution is pressed in PLC control:
1) calculates the steel plate tracing positional.By with the communication of roller-way control system, the acquisition speed value is carried out position calculation, be used for to determine the physical location of steel plate in conjunction with detection signal.
2) call determined matched curve, according to the determined location point of matched curve, compare with actual steel plate position, determine the time point of switch valve, send the switch valve signal.
3) with the mill control system communication, send the switch valve signal, mill control system is determined the switching of dephosphorization valve according to the original chain condition in scene.
Simultaneously, PLC has the function of demarcating matched curve, is mainly determined by artificial observing effect:
1) operative employee presses the demarcation button, and the dephosphorization valve adopts control manually, and PLC records the steel plate position that each dephosphorization valve opens and closes.PLC obtains the discharge data of each switch valve from mill control system simultaneously.
2) operative employee observes and removes the unicorn effect preferably, presses record button, and PLC records corresponding data.
3) after repeating repeatedly, the operative employee presses recovery button, and PLC descends the definite data that need of principle as matched curve most according to flow.Carry out afterwards automatically except unicorn.
4) the demarcation class repeatedly repeats according to actual effect, changes valve at every turn and must demarcate.
Embodiments of the invention are not limited to such scheme.For example: speed feedback can adopt modes such as encoder, and the function of PLC can be fused in the mill control system simultaneously, under the situation that capacity allows, this function is realized by mill control system.
After the employing said system, by the accurate water spray control to steel plate head, stopped de-scaling water fully and leaked spray, late phenomenon of spraying; Water spray control by to the steel plate afterbody has reduced the waste of water under high pressure, and this method perfection has solved the automatic control problem of injection valve, has improved automation degree of equipment, has reduced operators'skills is required and working strength.
Certainly, above-mentioned explanation is not limitation of the present invention, and the present invention also is not limited only to above-mentioned giving an example, and the variation that those skilled in the art make in essential scope of the present invention, remodeling, interpolation or replacement also belong to protection scope of the present invention.
Claims (4)
1. the accurate de-scaling autocontrol method of heavy plate mill is characterized in that, comprises the steps:
Position S on opportunity when (1) setting up steel plate and begin to enter milling train
0The head position S of steel plate when opening with the de-scaling injection valve
1The match relation curve;
(2) by with the communication of conveyor roller driving control system, the acquisition speed value is carried out position calculation, the position S on opportunity when the steel plate head position of detecting in conjunction with heat detecting device is used for determining that steel plate begins to enter milling train
0Physical location S with steel plate;
(3) call determined match relation curve, according to the determined location point of match relation curve, compare with actual steel plate position, determine to open the time point of Scale removing valve;
(4) with the mill control system communication, send and open the Scale removing valve signal, mill control system is determined the switching of dephosphorization valve according to the original chain condition in scene.
2. the accurate de-scaling autocontrol method of heavy plate mill according to claim 1 is characterized in that, described step (3) comprises the steps:
Position S on opportunity when (3.1) beginning to enter milling train according to the steel plate that obtains
0, the head position S of steel plate when in the match relation curve, finding corresponding de-scaling injection valve to open
1
(3.2) the physical location S of steel plate and head position S
1Compare, when
The time, send the control signal that the de-scaling injection valve is opened.
3. the accurate de-scaling automatic control system of heavy plate mill is characterized in that, comprising:
PLC control system: finish the physical location analysis of steel plate, determine the appropriate opportunity that Scale removing valve is opened based on this analysis;
Conveyor roller driving control system: control the speed of conveyor roller motor, and voltage signal is fed back to the PLC control system, finish the detection of conveyor roller speed;
Mill control system: carry out the switch Scale removing valve signal that the PLC control system is sent, determine the switching of dephosphorization valve according to the original chain condition in scene;
Steel plate head detection system: demarcate the steel plate head position, determine the physical location of steel plate.
4. the accurate de-scaling automatic control system of heavy plate mill according to claim 3 is characterized in that,
Described PLC control system comprises:
Match relation curve module: the position S on opportunity when foundation and storage steel plate begin to enter milling train
0The head position S of steel plate when opening with the de-scaling injection valve
1The match relation curve;
Steel plate actual calculation of location module: by with conveyor roller transmission control communication, the acquisition speed value is carried out position calculation, the position S on opportunity when determining that steel plate begins to enter milling train is believed in the steel plate head position of detecting in conjunction with heat detecting device
0Physical location S with steel plate;
Time point determination module: call determined match relation curve, according to the determined location point of match relation curve, compare with actual steel plate position, determine to open the time point of Scale removing valve;
Switch Scale removing valve control module: after arriving the time point of switch Scale removing valve, with the mill control system communication, send switch Scale removing valve signal, mill control system is determined the switching of dephosphorization valve according to the original chain condition in scene.
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|---|---|---|---|
| CN 201310251272 CN103272863A (en) | 2013-06-21 | 2013-06-21 | Method and system for automatically controlling heavy plate mill to accurately remove scales |
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|---|---|---|---|
| CN 201310251272 CN103272863A (en) | 2013-06-21 | 2013-06-21 | Method and system for automatically controlling heavy plate mill to accurately remove scales |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104624677A (en) * | 2014-12-26 | 2015-05-20 | 山东钢铁股份有限公司 | Scale removing control method and device for hot-rolled steel production line |
| CN106140842A (en) * | 2015-04-27 | 2016-11-23 | 鞍钢股份有限公司 | Full-automatic descaling control method for heavy and medium plate mill |
| CN106424159A (en) * | 2016-11-18 | 2017-02-22 | 首钢京唐钢铁联合有限责任公司 | Method for improving rough rolling rhythm of strip steel |
| CN110252831A (en) * | 2019-05-28 | 2019-09-20 | 莱芜钢铁集团电子有限公司 | A kind of one-touch scaling method of generous plate cooling device |
| CN111421006A (en) * | 2020-05-08 | 2020-07-17 | 太原科技大学 | Descaling system for monitoring oxide skin in real time |
| CN111974812A (en) * | 2020-07-09 | 2020-11-24 | 南京钢铁股份有限公司 | Production method of super-thick steel plate |
-
2013
- 2013-06-21 CN CN 201310251272 patent/CN103272863A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104624677A (en) * | 2014-12-26 | 2015-05-20 | 山东钢铁股份有限公司 | Scale removing control method and device for hot-rolled steel production line |
| CN106140842A (en) * | 2015-04-27 | 2016-11-23 | 鞍钢股份有限公司 | Full-automatic descaling control method for heavy and medium plate mill |
| CN106424159A (en) * | 2016-11-18 | 2017-02-22 | 首钢京唐钢铁联合有限责任公司 | Method for improving rough rolling rhythm of strip steel |
| CN106424159B (en) * | 2016-11-18 | 2019-07-23 | 首钢京唐钢铁联合有限责任公司 | Method for improving rough rolling rhythm of strip steel |
| CN110252831A (en) * | 2019-05-28 | 2019-09-20 | 莱芜钢铁集团电子有限公司 | A kind of one-touch scaling method of generous plate cooling device |
| CN111421006A (en) * | 2020-05-08 | 2020-07-17 | 太原科技大学 | Descaling system for monitoring oxide skin in real time |
| CN111421006B (en) * | 2020-05-08 | 2021-04-30 | 太原科技大学 | Descaling system for monitoring oxide skin in real time |
| CN111974812A (en) * | 2020-07-09 | 2020-11-24 | 南京钢铁股份有限公司 | Production method of super-thick steel plate |
| CN111974812B (en) * | 2020-07-09 | 2022-08-19 | 南京钢铁股份有限公司 | Production method of super-thick steel plate |
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Application publication date: 20130904 |