CN102310179B - Method for leakage on-line judging and early warning of dynamic slight press fan-shaped section hydraulic system - Google Patents
Method for leakage on-line judging and early warning of dynamic slight press fan-shaped section hydraulic system Download PDFInfo
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- CN102310179B CN102310179B CN 201110263742 CN201110263742A CN102310179B CN 102310179 B CN102310179 B CN 102310179B CN 201110263742 CN201110263742 CN 201110263742 CN 201110263742 A CN201110263742 A CN 201110263742A CN 102310179 B CN102310179 B CN 102310179B
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Abstract
The invention relates to a dynamic slight press fan-shaped section hydraulic system leakage fault on-line judging and early warning method, which belongs to the technical field of continuous casting equipment maintenance in the metallurgical industry. The method has the technical scheme that (1) a roll gap control system PLCS7-300 sends a 'fan-shaped section hydraulic system locking' order to a remote station PLCS7-300; (2) the pressure value of the fan-shaped section hydraulic system is fed back; (3) the value of a fan-shaped section displacement sensor is fed back; (4) the roll gap control system PLCS7-400 judges the feedback pressure value of the hydraulic system and the value of the fan-shaped section displacement sensor combinedly; and further the results are output to a continuous casting master control system. With the method disclosed by the invention, roll gap control loss caused by the leakage fault of the hydraulic system can be prevented, the actual roll gap is controlled to meet the scope designed by the technology, the contraction taper of the roller gap is ensured to guarantee casting blank quality, an early warning function is played to protect fan-shaped section equipment, key equipment is monitored comprehensively and managed automatically in the whole continuous casting production process, the continuous casting production is stabilized, the technical control level is improved, the product quality is improved, and economic benefits are created.
Description
Technical field
The present invention relates to the judgement of a kind of dynamic slight press fan-shaped section hydraulic system leakage On-line Fault and method for early warning, belong to metallurgy industry continuous casting installation for casting maintenance technique field.
Background technology
Dynamic soft reduction technology is the technology that can obviously improve Inner Quality of Billet that the world today generally acknowledges, this technology is to take the mode of real-time special drafts to make up strand at casting blank solidification end to shrink, and this technology can significantly be improved slab quality.The dynamic soft reduction technology fan-shaped section adopts the hydraulic pressure executive mode to control the differentiation that the roll gap variation realizes the strand drafts, and hydraulic system is the direct driving force of fan-shaped section, and the implementation status of fan-shaped section hydraulic system is directly determining the variation of roll gap.Because the difference of the more traditional Reduction Technology of dynamic soft reduction technology is mobilism, periodically roll gap is carried out intermittence and adjust, the more original working method of hydraulic system has also had larger variation, the more conventional casting machine executive mode of hydraulic system operating frequency also raises accordingly, and precision and the correspondence of its execution are also had higher requirement.In actual production process due to fan-shaped section hydraulic system frequent movement, especially the frequent movement of hydraulic cylinder under high load capacity, equipment be on active service the later stage often cause in various degree in let out phenomenon, this phenomenon is once occur to cause the situation of unreachable position to occur.In the control system of closed circuit signaling feedback, hydraulic system meeting frequent movement is with the realize target value.This kind situation has formed the wearing and tearing that vicious circle has aggravated equipment more, lets out in causing that phenomenon is uncontrollable until equipment is retired.The method of letting out judgement in hydraulic cylinder is more, is that 201020520663.3 " hydraulic cylinder interior leakage detector ", the patent No. are all multi-methods such as " a kind of cylinder benchs " of 200820146890.7 such as the patent No., statement no longer one by one here.But the method for inspection that is based on above conventional hydraulic cylinder interior leakage is all off-line technologies, hydraulic cylinder need to be removed from main equipment and be carried out offline inspection and reparation.This kind method need be shut down maintenance, dismounting parts, affects the operating rate of main equipment; , labour intensity higher to operation requirements is large simultaneously, False Rate is higher.Online hydraulic system determination methods generally relies on artificial experience, due to the phenomenon that the hydraulic oil of the hydraulic system of letting out in existing is repeatedly worked and existed temperature to raise, experienced workman judges that by touching conduit under fluid pressure its temperature rise situation has judged whether that the internal leakage situation occurs.But this kind method operation easier is large, work under bad environment, labour intensity are large, has especially that judging nicety rate is low, problem that can't quantification.
Summary of the invention
The invention provides a kind of dynamic slight press fan-shaped section hydraulic system leakage On-line Fault judgement and method for early warning; realize online judgement and the early warning of hydraulic system fault; can prevent that the roll gap that causes due to the hydraulic system leakage fault is out of control; control in the scope that actual roll gap meets technology establishment; the contraction tapering that had both guaranteed roll gap is guaranteed slab quality; can play again the effect protection sector section equipment of early warning, solve the problems referred to above that background technology exists.
technical solution of the present invention is: the judgement of dynamic slight press fan-shaped section hydraulic system leakage On-line Fault and method for early warning, utilize dynamic soft reduction control system to carry out the judgement of dynamic slight press fan-shaped section hydraulic system leakage On-line Fault and early warning, said dynamic soft reduction control system is comprised of " Roll Gap Control System PLC S7-400 " and many " distant station PLC S7-300 ", " Roll Gap Control System PLC S7-400 " abbreviation " PLC S7-400 ", " distant station PLC S7-300 " abbreviation " PLC S7-300 ", " PLC S7-400 " is connected with each " PLC S7-300 " by the DP communication, " PLC S7-300 " is connected with the fan-shaped section terminal fitting by the private line access mode, and the fan-shaped section terminal fitting comprises: displacement transducer, hydraulic pressure unit, power supply, cental system " PLC S7-400 " at conticaster carries out computing and judgement, by in advance Rule of judgment being preset, utilize " PLC S7-400 " to judge the pressure changing of hydraulic system, and then judge its malfunction, and send to sector actuating mechanism to take measures signal, simultaneously send early warning to " continuous casting master control system ", " continuous casting master control system " abbreviation " engineer station ".
Concrete steps are as follows: 1. " PLC S7-400 " is to " PLC S7-300 " transmission " locking fan-shaped section hydraulic system " order; 2. " PLC S7-300 " is to " PLC S7-400 " feedback fan-shaped section hydraulic system pressure value; 3. " PLC S7-300 " is to " PLC S7-400 " feedback fan-shaped segment displacement sensor value; 4. " PLC S7-400 " is combined judgement with the hydraulic system pressure value of " PLC S7-300 " feedback with the fan-shaped segment displacement sensor value; And then result is exported to " engineer station ", send command adapted thereto to " PLC S7-300 " simultaneously and recover instruction in normal steel pouring process.
The present invention realizes the online judgement of the pressure changing of hydraulic system and early warning on the basis of continuous casting machine dynamic soft reduction control system, A hydraulic cylinder, B hydraulic cylinder, C hydraulic cylinder, D hydraulic cylinder are set respectively on fan-shaped section, " PLC S7-300 " exports to " PLC S7-400 " with the pressure signal of A hydraulic cylinder, B hydraulic cylinder, C hydraulic cylinder, D hydraulic cylinder on fan-shaped section respectively, and " PLC S7-400 " completes the judgement work of sensor signal; The instruction of judged result is exported to " PLC S7-300 " by " PLC S7-400 ", " PLC S7-300 " execution action.
step is as follows more specifically: in the dynamic soft-reduction action gap, this time is judged by " PLC S7-400 ", the condition that satisfies is: permanent pulling rate, the permanent water yield, the displacement transducer value of feedback was stablized in 10 cycles, send Rule of judgment by " PLC S7-400 " to " PLC S7-300 ", the hydraulic system of some fan-shaped section is locked, this moment fan-shaped section on the A hydraulic cylinder, the B hydraulic cylinder, the C hydraulic cylinder, the hydraulic oil of D hydraulic cylinder upper and lower cavity all keeps closed state, fed back the oil pressure situation of change of this fan-shaped section to " PLC S7-400 " by " PLC S7-300 " within 10 clock cycle, begin to carry out recovery operation the 11st cycle, carry out various feedbacks and executable operations under original normal condition, the condition that judges within 10 clock cycle is as follows: the force value before beginning to lock is P0, and the force value after locking is defined as P1, P2, P3--P10, the relation of judgement has following several:
1. at first judge the relation of P0 and P1, greater than 20%, and P2, P3--P10 be when all being the stairway degression mode when P1 and P0 pressure value difference, and this moment is due to the hydraulic lock assembly fault, causes the decline of oil pressure in 10 clock cycle to be the amplitude such as staged and descend; This moment, obvious auxiliary judgment was characterized as the variation that displacement transducer returns to the amplitude such as numerical value appearance;
2. work as P1 and P0 pressure value difference greater than 20%, and when P2, P3--P10 all are the stairway degression mode and in reduction amplitude situation about diminishing gradually, can be judged to be piston in hydraulic cylinder place's seal failure in this kind situation, this moment, obvious supplemental characteristic was that the numerical value that returns of displacement transducer is not along with the variation of clock cycle;
3. work as P1 and P0 pressure value difference less than 20% within 10 clock cycle, the fan-shaped section hydraulic system is not let out situation in not existing; The auxiliary judgment of this moment is characterized as: the displacement transducer value does not change;
" PLC S7-400 " sends early warning to " engineer station " after drawing above judged result, show the warning of " hydraulic system fault " on picture, remind master control in time find and deal with problems, request manual intervention " locking fan-shaped section " or " ignoring fault ", next step is worked according to the manual command, stops carrying out any action to carrying out fan-shaped section in this process; Until manual intervention or pressure lock this fan-shaped section, prevent production accident.
Good effect of the present invention: the present invention is delivered to " PLC S-400 " by the fan-shaped section hydraulic pressure signal to " PLC S-300 " feedback and carries out computing judgement and realize the judgement of dynamic slight press fan-shaped section hydraulic system leakage On-line Fault and early warning; the method can prevent that the roll gap that causes due to the hydraulic system leakage fault is out of control; control in the scope that actual roll gap meets technology establishment; the contraction tapering that had both guaranteed roll gap is guaranteed slab quality, can play again the effect protection sector section equipment of early warning.After this system's operation, can accomplish in advance the fan-shaped section hydraulic fault to be carried out early warning, fan-shaped section hydraulic system has been carried out the On-line Fault judgement, effectively stopped the segment roll gap ANOMALOUS VARIATIONS and the device damage that cause due to hydraulic system fault, continuous casting production overall process is carried out key equipment overall monitor and automatic management, stablize continuous casting production, improved the technology controlling and process level, improved the quality of products, increased the wound economic benefit.
Description of drawings
Fig. 1 is Roll Gap Control System PLC S7-400 schematic diagram of the present invention;
Fig. 2 is distant station PLC S7-300 schematic diagram of the present invention;
Fig. 3 is that the vertical transmission of hydraulic pressure signal of the present invention concerns schematic diagram;
Fig. 4 is fan-shaped section hydraulic cylinder numbering of the present invention;
Fig. 5 is logic judgement of the present invention and transfer of data schematic diagram.
The specific embodiment
Below in conjunction with accompanying drawing, by embodiment, the invention will be further described.
Reference is as Fig. 1, and " PLC S7-400 " is connected with each fan-shaped section " PLC S7-300 " by the DP communication, and each " PLC S7-300 " belongs to parallel relation, completes communication with " PLC S7-400 ".Do not carry out communication and transfer of data between each fan-shaped section distant station.When breaking down, some distant stations can with this station manual locking, can not affect the normal operation of other distant stations.
With reference to accompanying drawing 2, " PLC S7-300 " is connected with the fan-shaped section terminal fitting by the private line access mode.Feedback signal, hydraulic pressure executive signal (comprising hydraulic cylinder execution and hydraulic fault system), hydraulic system feedback signal, power supply comprising sensor displacement.
With reference to accompanying drawing 4, each fan-shaped section comprises 4 hydraulic cylinders, respectively with A hydraulic cylinder, B hydraulic cylinder, C hydraulic cylinder, D hydraulic cylinder code name, push up at its hydraulic cylinder accordingly A displacement transducer, B displacement transducer, C displacement transducer, D displacement transducer are installed in system.Under the displacement transducer normal condition, each displacement transducer carries out respectively the feedback of data according to clock frequency.
Reference is as Fig. 5, and the method is comprised of following step:
1, " PLC S7-400 " is to " PLC S7-300 " transmission " locking fan-shaped section hydraulic system " order;
2, " PLC S7-300 " is to " PLC S7-400 " feedback fan-shaped section hydraulic system pressure value;
3, " PLC S7-300 " is to " PLC S7-400 " feedback fan-shaped segment displacement sensor value;
4, " PLC S7-400 " is combined judgement with the hydraulic system pressure value of " PLC S7-300 " feedback with the fan-shaped segment displacement sensor value; And then result is exported to " engineer station ", send command adapted thereto to " PLC S7-300 " simultaneously and recover instruction in normal steel pouring process.
Embodiment one: fan-shaped section hydraulic system locking device fault.
Under permanent pulling rate, the permanent water yield, 10 interior stable case of cycle of displacement transducer value of feedback, send the instruction of locking fan-shaped section hydraulic system by " PLC S7-400 " to " PLC S7-300 ", the hydraulic system of 6# fan-shaped section is locked, on fan-shaped section, the hydraulic oil of A hydraulic cylinder, B hydraulic cylinder, C hydraulic cylinder, D hydraulic cylinder upper and lower cavity all keeps closed state at this moment, fed back the oil pressure situation of change of this fan-shaped section to " PLC S7-400 " by " PLC S7-300 " within 10 clock cycle, as shown in the table with data instance in the A hydraulic cylinder:
The relational process of judgement P0 and P1 is as follows: P1 and P0 pressure value difference are that 4.7 MPa are greater than 20% of P0, and when P2, P3--P10 all are the stairway degression mode, this moment is due to the hydraulic lock assembly fault, cause early stage P1-P5 in totally 5 clock cycle the decline of oil pressure be the amplitude such as staged and descend, totally 5 oil pressure values of later stage P6-P10 changes the amounts of tending to be steady; Fail fully lock its hydraulic system due to fan-shaped section hydraulic lock assembly fault this moment, P1 and P2 in the cycle hydraulic pressure value reduce rapidly.Have the 18.2MPa of P0 to be reduced to the 11.9MPa of P2, this moment, displacement transducer did not also change because a part of oil pressure has been offset in the expansion of hydraulic circuit and cylinder body; When oil pressure further reduced, piston was further opened the effect bottom offset sensor of balance oil pressure is stepped; Oil pressure is not changing in the situation that later stage pressure becomes steady, and piston continues mobile under the effect of fan-shaped section external force, and oil pressure is shown as steady state value under external force simultaneously." PLC S7-400 " judgement hydraulic lock assembly fault, send early warning to " engineer station " at this moment, informs fan-shaped section hydraulic lock assembly fault, and request emphasis when shutting down maintenance is safeguarded; Because this kind situation does not affect at that time continuous casting production, " PLC S7-400 " sends data command before the locking hydraulic system to 6# " PLC S7-300 " simultaneously, and roll gap is controlled at 220mm again.
Embodiment two: fan-shaped section piston in hydraulic cylinder place's seal failure.
Under permanent pulling rate, the permanent water yield, 10 interior stable case of cycle of displacement transducer value of feedback, send the instruction of locking fan-shaped section hydraulic system by " PLC S7-400 " to " PLC S7-300 ", the hydraulic system of 7# fan-shaped section is locked, on fan-shaped section, the hydraulic oil of A hydraulic cylinder, B hydraulic cylinder, C hydraulic cylinder, D hydraulic cylinder upper and lower cavity all keeps closed state at this moment, fed back the oil pressure situation of change of this fan-shaped section to " PLC S7-400 " by " PLC S7-300 " within 10 clock cycle, as shown in the table with data instance in the A hydraulic cylinder:
The relational process of judgement P0 and P1 is as follows: P1 and P0 pressure value difference are that 4.72MPa is greater than 20% of P0, and when P1, P10 all are the stairway degression mode, this moment is owing to letting out fault in piston, cause early stage P1-P10 in totally 5 clock cycle the decline of oil pressure be the amplitude such as staged and descend, so let out in general piston all not can too serious oil pressure decline can be too unobvious; So that is to say piston cylinder in be not moved, displacement transducer value of feedback substantially constant because the fan-shaped section hydraulic cylinder is to let out the fault fan-shaped section in appearance the roll gap variation does not occur this moment.Let out fault in " PLC S7-400 " judgement piston in hydraulic cylinder at this moment, send early warning to " engineer station ", inform in the fan-shaped section piston in hydraulic cylinder and let out fault, the request manual intervention; Affect the execution accuracy of roll gap due to this kind situation, will affect continuous casting production at that time, so " PLC S7-400 " sends the instruction of locking hydraulic system to 6# " PLC S7-300 ", oil-feed and the oil return circuit of A hydraulic cylinder, B hydraulic cylinder, C hydraulic cylinder, D hydraulic cylinder upper and lower cavity on this fan-shaped section are all locked, be that fan-shaped section remains on original 220mm gap values between rollers, keep normal production.Carry out emphasis when overhauling after end to be produced and safeguard or change hydraulic cylinder.
Claims (4)
1. a dynamic slight press fan-shaped section hydraulic system leakage On-line Fault judges and method for early warning, it is characterized in that utilizing dynamic soft reduction control system to carry out the judgement of dynamic slight press fan-shaped section hydraulic system leakage On-line Fault and early warning, said dynamic soft reduction control system is comprised of Roll Gap Control System PLC S7-400 and many distant station PLC S7-300, and Roll Gap Control System PLC S7-400 is connected with each distant station PLC S7-300 by the DP communication; Distant station PLC S7-300 is connected with the fan-shaped section terminal fitting by the private line access mode, and the fan-shaped section terminal fitting comprises: displacement transducer, hydraulic pressure unit, power supply; Carry out computing and judgement at the described Roll Gap Control System PLC S7-400 as the cental system of conticaster, by in advance Rule of judgment being preset, utilize Roll Gap Control System PLC S7-400 to judge the pressure changing of hydraulic system, and then judge its malfunction, and send to sector actuating mechanism to take measures signal, send early warning to the continuous casting master control system simultaneously.
2. according to claim 1 dynamic slight press fan-shaped section hydraulic system leakage On-line Fault judgement and method for early warning, it is characterized in that concrete steps are as follows: 1. Roll Gap Control System PLC S7-400 sends the order of locking fan-shaped section hydraulic system to distant station PLC S7-300; 2. distant station PLC S7-300 is to Roll Gap Control System PLC S7-400 feedback fan-shaped section hydraulic system pressure value; 3. distant station PLC S7-300 is to Roll Gap Control System PLC S7-400 feedback fan-shaped segment displacement sensor value; 4. Roll Gap Control System PLC S7-400 is combined judgement with the hydraulic system pressure value of distant station PLC S7-300 feedback with the fan-shaped segment displacement sensor value; And then result is exported to the continuous casting master control system, simultaneously send command adapted thereto to distant station PLC S7-300 and namely recover instruction in normal steel pouring process.
3. the judgement of described dynamic slight press fan-shaped section hydraulic system leakage On-line Fault and method for early warning according to claim 1 and 2, it is characterized in that arranging respectively on fan-shaped section A hydraulic cylinder, B hydraulic cylinder, C hydraulic cylinder, D hydraulic cylinder, distant station PLC S7-300 exports to Roll Gap Control System PLC S7-400 with the pressure signal of A hydraulic cylinder, B hydraulic cylinder, C hydraulic cylinder, D hydraulic cylinder on fan-shaped section respectively, and Roll Gap Control System PLC S7-400 completes the judgement work of sensor signal; The instruction of judged result is exported to distant station PLC S7-300 by Roll Gap Control System PLC S7-400, distant station PLC S7-300 execution action.
4. according to claim 3 dynamic slight press fan-shaped section hydraulic system leakage On-line Fault judgement and method for early warning, it is characterized in that step is as follows more specifically: in the dynamic soft-reduction action gap, this time is judged by Roll Gap Control System PLC S7-400, the condition that satisfies is: permanent pulling rate, the permanent water yield, the displacement transducer value of feedback was stablized in 10 clock cycle, send Rule of judgment by Roll Gap Control System PLC S7-400 to distant station PLC S7-300, the hydraulic system of some fan-shaped section is locked, this moment fan-shaped section on the A hydraulic cylinder, the B hydraulic cylinder, the C hydraulic cylinder, the hydraulic oil of D hydraulic cylinder upper and lower cavity all keeps closed state, fed back the oil pressure situation of change of this fan-shaped section to Roll Gap Control System PLC S7-400 by distant station PLC S7-300 within 10 clock cycle, begin to carry out recovery operation the 11st clock cycle, carry out various feedbacks and executable operations under original normal condition, the condition that judges within 10 clock cycle is as follows: the force value before beginning to lock is P0, and the force value after locking is defined as P1, P2, P3--P10, the relation of judgement has following several:
1. at first judge the relation of P0 and P1, greater than 20%, and P2, P3--P10 be when all being the stairway degression mode when P1 and P0 pressure value difference, and this moment is due to the hydraulic lock assembly fault, causes the decline of oil pressure in 10 clock cycle to be the amplitude such as staged and descend; This moment, obvious auxiliary judgment was characterized as the variation that displacement transducer returns to the amplitude such as numerical value appearance;
2. work as P1 and P0 pressure value difference greater than 20%, and when P2, P3--P10 all are the stairway degression mode and in reduction amplitude situation about diminishing gradually, can be judged to be piston in hydraulic cylinder place's seal failure in this kind situation, this moment, obvious supplemental characteristic was that the numerical value that returns of displacement transducer is not along with the variation of clock cycle;
3. work as P1 and P0 pressure value difference less than 20% within 10 clock cycle, the fan-shaped section hydraulic system is not let out situation in not existing; The auxiliary judgment of this moment is characterized as: the displacement transducer value does not change;
Roll Gap Control System PLC S7-400 sends early warning to the continuous casting master control system after drawing above judged result, show the warning of hydraulic system fault on picture, remind master control in time find and deal with problems, the request manual intervention locks fan-shaped section or ignores fault, next step is worked according to the manual command, stops carrying out any action to carrying out fan-shaped section in this process; Until manual intervention or pressure lock this fan-shaped section, prevent production accident.
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| CN102554169B (en) * | 2012-03-15 | 2013-12-18 | 中冶连铸技术工程股份有限公司 | Method and device for controlling system security under light press of slab |
| CN104384458B (en) * | 2014-11-17 | 2016-04-20 | 马钢(集团)控股有限公司 | A kind of CSP continuous casting segment hydraulic cylinder interior leakage detection method |
| CN111442016B (en) * | 2019-01-16 | 2021-11-16 | 宝山钢铁股份有限公司 | Automatic early warning and judging method for oil leakage of hydraulic system of continuous casting machine |
| CN112756574B (en) * | 2020-11-27 | 2022-06-14 | 邯郸钢铁集团有限责任公司 | Slab continuous casting soft reduction control method under fault condition of displacement sensor |
| CN112985861B (en) * | 2021-02-19 | 2022-08-09 | 北京首钢自动化信息技术有限公司 | Fault diagnosis method for sector section of withdrawal and straightening machine |
| CN113399638B (en) * | 2021-06-29 | 2022-09-16 | 上海二十冶建设有限公司 | Partitioned step-by-step debugging method for sector section electrical system of slab caster |
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| JP5600929B2 (en) * | 2008-12-10 | 2014-10-08 | Ｊｆｅスチール株式会社 | Manufacturing method of continuous cast slab |
| CN101865181B (en) * | 2010-06-29 | 2012-09-26 | 中国传媒大学 | Automatic diagnostic system of hydraulic system applied to stage driving |
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