CN102688996B - Method for suppressing interference of electromagnetic braking to signal of liquid level meter - Google Patents
Method for suppressing interference of electromagnetic braking to signal of liquid level meter Download PDFInfo
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- CN102688996B CN102688996B CN 201210195330 CN201210195330A CN102688996B CN 102688996 B CN102688996 B CN 102688996B CN 201210195330 CN201210195330 CN 201210195330 CN 201210195330 A CN201210195330 A CN 201210195330A CN 102688996 B CN102688996 B CN 102688996B
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Abstract
The invention provides a method for suppressing the interference of electromagnetic braking to a signal of a liquid level meter. The conventional liquid level detection control system, the conventional electromagnetic braking device and control system, the conventional programmable logic controller (PLC), the conventional first-class computer and the like are utilized, a digital signal processor (DSP) chip system is added between the liquid level meter and the liquid level detection control system according to needs, a liquid level virtual height caused by the electromagnetic braking is corrected, and a corrected signal is output to the liquid level detection control system. The interference of the electromagnetic braking to the signal of the liquid level meter can be effectively suppressed, a liquid level virtual height phenomenon can be prevented, the liquid level control accuracy of a crystallizer and the stable running of electromagnetic braking equipment are ensured, a crystallizer blank shell thinning problem caused by the liquid level virtual height is solved, potential safety hazards are eliminated, and a foundation is laid for the production of high-quality steel.
Description
Technical field
The invention belongs to the continuous casting process control field, relate in particular to a kind of method for suppressing mould electromagnetic brake magnetic field the tank gage signal being disturbed.
Background technology
Rationally use the mould electromagnetic brake technology on conticaster, can significantly improve the surface quality of steel, improve pulling rate and production efficiency.But find when using electromagnetic braking aborning, the magnetic field meeting severe jamming that the unlatching electromagnetic braking produces is to the detection signal of mould liquid level instrument, make the mould liquid level instrument be delivered to the detection signal distortion of tank level control system, and after the signal output of tank level control system according to distortion, certainly will cause between mould liquid level actual value and setting value and produce very large deviation, namely there is " liquid level virtual height " phenomenon, because " liquid level virtual height " causes crystallizer shell thickness attenuate, there is greatly bleed-out risk.Simultaneously, also directly affected the stable operation of electromagnetic braking equipment, the situation that even causes electromagnetic braking normally to use.
Summary of the invention
The present invention aims to provide and a kind ofly can suppress the method that disturb the tank gage signal in electromagnetic braking magnetic field, thereby effectively prevents the level fluctuation in crystallizer, guarantees the electromagnetic braking stable equipment operation, eliminates safe hidden trouble, and improves steel quality.
For this reason, the solution taked of the present invention is:
A kind ofly suppress the method that electromagnetic braking is disturbed the tank gage signal, it is characterized in that, set up Digital Signal Processing (DSP) chip system between tank gage and tank level control system, the liquid level virtual height that electromagnetic braking causes is revised, and revised signal is exported to tank level control system, realize mould liquid level and electromagnetic braking bistable; Its concrete grammar is:
1, set up a dsp chip in the liquid level instrument system switch board, configure embedded system in chip, be furnished with the compensation program to magnetic interference in embedded system, tank level control system is revised and exported to compensation program with the liquid level signal that collects;
2,2 output cable places in the electromagnetic braking junction box increase respectively 1 current sensor, the output current of upper coil and lower coil after starting for detection of electromagnetic braking, and with the current signal transfer that the detects embedded system to dsp chip;
3, set up module a and module b in the electromagnetic braking control program, module a and module b corresponding two kinds of electric currents respectively apply pattern: wherein module a meets the same direction current pattern, and module b meets the reversing the current pattern; Simultaneously, increase button and reversing button in the same way on the one-level picture of electromagnetic braking, and by programmable logic controller (PLC) the difference link block a of system and module b;
4, dsp chip system calibrating:
When each new crystallizer or tank gage come into operation, need to activate the dsp chip system by demarcation; Concrete scaling method is:
A, before conticaster is produced, be placed in crystallizer with aluminium sheet simulation molten steel, the insertion position is apart from copper plate of crystallizer 100mm suitable for reading place;
B, select different current-modes according to the difference of the electromagnetic braking coil mode of connection; When lower coil in electromagnetic braking in the same way during wiring, selects current-mode one to open electro-magnetic braking device according to magnetic direction; During according to the magnetic direction reverse wiring, select current-mode two to open electro-magnetic braking devices when lower coil in electromagnetic braking;
C, dsp chip system gathers the level fluctuation signal under different current status automatically, and signal is input in the database of system;
D, set the end of electric current along with pattern, electro-magnetic braking device stops automatically, and the dsp chip system acquisition is complete;
E, taking-up aluminium sheet are demarcated and are finished;
5, in normal productive process, after opening electromagnetic braking, the dsp chip system will gather automatically to liquid level signal and the electromagnetic braking field signal that tank gage transmits, compensation program is revised the liquid level signal that collects and compensate according to the magnetic interference degree, and the liquid level signal after compensating exports to tank level control system, and tank level control system is according to offset crystallization control device liquid level.
Beneficial effect of the present invention is:
Because the present invention can be shown according to magnetic interference degree correction tank gage and participate in the liquid level signal controlled, thereby can effectively suppress electromagnetic braking to the interference of tank gage signal, prevent " liquid level virtual height " phenomenon, guaranteed the stable operation of mould liquid level control accuracy and electromagnetic braking equipment, avoided the crystallizer shell thickness attenuate problem that causes due to " liquid level virtual height ", eliminated potential safety hazard, laid a good foundation for producing high-quality steel.Simultaneously, when not opening electromagnetic braking, programming system of the present invention does not also play a role, and therefore can the tank level control system in original production not impacted.
Description of drawings
Fig. 1 is that the electromagnetic braking electric current applies pattern one.
Fig. 2 is that the electromagnetic braking electric current applies pattern two.
Fig. 3 is for suppressing electromagnetic braking to tank gage signal EVAC structure and FB(flow block).
The specific embodiment
The present invention suppresses the method that electromagnetic braking is disturbed the tank gage signal, utilize original liquid level to detect control system, electro-magnetic braking device and control system, PLC and one-level computer etc., and set up as required the dsp chip system between tank gage and tank level control system, the liquid level virtual height that electromagnetic braking causes is revised, and revised signal is exported to tank level control system, realize mould liquid level and electromagnetic braking bistable.Concrete grammar of the present invention is:
1, set up a dsp chip in the liquid level instrument system switch board, configure embedded system in chip, be furnished with the compensation program to magnetic interference in embedded system, tank level control system is revised and exported to compensation program with the liquid level signal that collects.
2,2 output cable places in the electromagnetic braking junction box increase respectively 1 current sensor, the output current of upper coil and lower coil after starting for detection of electromagnetic braking, and with the current signal transfer that the detects embedded system to dsp chip.
3, set up module a and module b in the electromagnetic braking control program, module a and module b corresponding two kinds of electric currents respectively apply pattern: wherein module a meets the same direction current pattern, and module b meets the reversing the current pattern; Simultaneously, increase button and reversing button in the same way on the one-level picture of electromagnetic braking, and by the PLC difference link block a of system and module b.
4, dsp chip system calibrating:
When each new crystallizer or tank gage come into operation, need to activate the dsp chip system by demarcation.Concrete scaling method is:
A, before conticaster is produced, be placed in crystallizer with aluminium sheet simulation molten steel, the insertion position is apart from copper plate of crystallizer 100mm suitable for reading place;
B, select different current-modes according to the difference of the electromagnetic braking coil mode of connection; When lower coil in electromagnetic braking in the same way during wiring, selects current-mode one to open electro-magnetic braking device according to magnetic direction; During according to the magnetic direction reverse wiring, select current-mode two to open electro-magnetic braking devices when lower coil in electromagnetic braking;
C, dsp chip system gathers the level fluctuation signal under different current status automatically, and signal is input in the database of system;
D, set the end of electric current along with pattern, electro-magnetic braking device stops automatically, and the dsp chip system acquisition is complete;
E, taking-up aluminium sheet are demarcated and are finished.
5, in normal productive process, after opening electromagnetic braking, the dsp chip system will gather automatically to liquid level signal and the electromagnetic braking field signal that tank gage transmits, compensation program is revised the liquid level signal that collects and compensate according to the magnetic interference degree, and the liquid level signal after compensating exports to tank level control system, and tank level control system is according to offset crystallization control device liquid level.
Claims (1)
1. one kind is suppressed the method that electromagnetic braking is disturbed the tank gage signal, it is characterized in that, setting up Digital Signal Processing between tank gage and tank level control system is the dsp chip system, the liquid level virtual height that electromagnetic braking causes is revised, and revised signal is exported to tank level control system, realize mould liquid level and electromagnetic braking bistable; Its concrete grammar is:
(1), set up a dsp chip in the liquid level instrument system switch board, configure embedded system in chip, be furnished with the compensation program to magnetic interference in embedded system, tank level control system is revised and exported to compensation program with the liquid level signal that collects;
(2), 2 output cable places in the electromagnetic braking junction box increase respectively 1 current sensor, the output current of upper coil and lower coil after starting for detection of electromagnetic braking, and with the current signal transfer that the detects embedded system to dsp chip;
(3), set up module a and module b in the electromagnetic braking control program, module a and module b corresponding two kinds of electric currents respectively apply pattern: wherein module a meets the same direction current pattern, and module b meets the reversing the current pattern; Simultaneously, increase button and reversing button in the same way on the one-level picture of electromagnetic braking, and by the PLC difference link block a of system and module b;
(4), dsp chip system calibrating:
When each new crystallizer or tank gage come into operation, need to activate the dsp chip system by demarcation; Concrete scaling method is:
A, before conticaster is produced, be placed in crystallizer with aluminium sheet simulation molten steel, the insertion position is apart from copper plate of crystallizer 100mm suitable for reading place;
B, select different current-modes according to the difference of the electromagnetic braking coil mode of connection; When lower coil in electromagnetic braking in the same way during wiring, selects current-mode one to open electro-magnetic braking device according to magnetic direction; During according to the magnetic direction reverse wiring, select current-mode two to open electro-magnetic braking devices when lower coil in electromagnetic braking;
C, dsp chip system gathers the level fluctuation signal under different current status automatically, and signal is input in the database of system;
D, set the end of electric current along with pattern, electro-magnetic braking device stops automatically, and the dsp chip system acquisition is complete;
E, taking-up aluminium sheet are demarcated and are finished;
(5), in normal productive process, after opening electromagnetic braking, the dsp chip system will gather automatically to liquid level signal and the electromagnetic braking field signal that tank gage transmits, compensation program is revised the liquid level signal that collects and compensate according to the magnetic interference degree, and the liquid level signal after compensating exports to tank level control system, and tank level control system is according to offset crystallization control device liquid level.
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| CN 201210195330 CN102688996B (en) | 2012-06-13 | 2012-06-13 | Method for suppressing interference of electromagnetic braking to signal of liquid level meter |
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| CN 201210195330 CN102688996B (en) | 2012-06-13 | 2012-06-13 | Method for suppressing interference of electromagnetic braking to signal of liquid level meter |
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