CN105695726A - Roller way speed closed-loop control method of online continuous induction furnace - Google Patents
Roller way speed closed-loop control method of online continuous induction furnace Download PDFInfo
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- CN105695726A CN105695726A CN201410694408.3A CN201410694408A CN105695726A CN 105695726 A CN105695726 A CN 105695726A CN 201410694408 A CN201410694408 A CN 201410694408A CN 105695726 A CN105695726 A CN 105695726A
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Abstract
The invention relates to an online, mobile and continuous steel plate induction heating roller way technology, and concretely relates to a roller way speed closed-loop control method of an online continuous induction furnace. The roller way speed closed-loop control method of the online continuous induction furnace comprises the following steps: a steel plate enters at a high speed V1 in a first furnace front roller way (1), moves in a second furnace front roller way (2) at a low speed V2 and enters a furnace roller way (3) in an induction heating furnace, and the steel plate completely departs from the induction heating furnace (7) and enters a furnace back roller way (4) at a high speed V3; and a first metal sensor (5) is arranged above a juncture of the first furnace front roller way and the second furnace front roller way, and a second metal sensor (6) is arranged above a juncture of the furnace roller way and the furnace back roller way. The rolled rapid-movement steel plate decelerates and goes through the online induction heating furnace at the low speed in order to be heated, so enough induction heating time is guaranteed to reach a required tempering temperature; and the rolled plate goes through an induction heating furnace cavity at the high speed without rapid heating.
Description
Technical field
The present invention relates to a kind of steel plate and move the roller-way technology that sense of continuity should heat online, particularly relate to the roller table speed closed loop control method of a kind of on-line continuous induction furnace, it is adaptable to the thermomechanical of medium plate controls Technology。
Background technology
Progress along with science and technology, the scope of materials application is constantly expanded, people are further harsh to the requirement of material property, thermomechanical controls technique (TMCP) and the performance of material is had material impact, the production of property steel plate can be realized, high-strength steel as excellent in welding performance, Steels for High Rise Buildings and large ship steel etc., can the quality level of significant increase slab, the performance impact of slab is especially pronounced。One important feature of a new generation's TMCP technology is that the burning optimization on line process after rolling is not limited only to cooling or insulation, also can carry out the heating of certain condition in some cases。The burning optimization on line device of cut deal utilizes efficient induction heating apparatus to carry out prompt tempering, it is possible to distribution and size to carbide are controlled so that it is highly uniform, tiny is scattered on matrix, thus realizing high intensity and the high tenacity of quenched and tempered steel。
Quickly heating tempering technology after rolling and rolling is that the material improving the intensity of steel, toughness and weldability controls Technology。Owing to on-line continuous induction heating tempering stove furnace chamber is long, steel plate to be heated is thick, and therefore steel plate to be heated must pass through to ensure to reach tempering process temperature by low speed in induction tempering stove。Current hot rolling pilot scale platform rolls the whole section of control of speed of rear roller roller, and install online sense of continuity additional and answer after tempering furnace due to reasons such as the response characteristics of furnace chamber size and induction heater, must whole section of roll after rolling be divided in stokehold, stove, three sections of rolls of furnace rear, the speed controlling of three sections of roller-ways is both needed to reach technological requirement。By literature query and patent retrieval, there is no in on-line continuous induction heater stokehold, stove at present, the technology of furnace rear roller roller speed closed loop control。Chinese patent CN201010159155.1 discloses a kind of slighter compress roller speed control method, and this patent carries out roller speed control system for every pair of pulling-straightening roller, and milling train online roller-way quantity is many, distance, adopts single roller speed control system inapplicable。
Summary of the invention
It is an object of the invention to provide the roller table speed closed loop control method of a kind of on-line continuous induction furnace, the strip of quickly movement after rolling is slowed down with low speed by online induction heater heating by the method, to ensure enough to sense heat time heating time to reach the temperature of technological requirement；Without the strip of quick demand for heat then with at a high speed by induction heater chamber after rolling。
In order to realize above-mentioned technical purpose, the present invention adopts the following technical scheme that
A kind of roller table speed closed loop control method of on-line continuous induction furnace, steel plate is moved on a production line by roller-way, the roller-way of production line is divided into three parts: charging roller table, furnace rolls road and furnace rear roller-way, and described charging roller table includes stokehold the first roller-way and stokehold the second roller-way；It is arranged above the first metal sensor, furnace rolls road and furnace rear roller-way intersection at stokehold the first roller-way and the second roller-way intersection and is arranged above the second metal sensor；
Described stokehold the first roller table speed is controlled by stokehold the first roller-way servo electrical machinery system, stokehold the second roller table speed is controlled by stokehold the second roller-way servo electrical machinery system, furnace rolls road speed is controlled by furnace rolls road servo electrical machinery system, and furnace rear roller table speed is controlled by furnace rear roller-way servo electrical machinery system；Described servo electrical machinery system includes servomotor, controller, reductor, shaft coupling, motor and speed reducer base；Described first metal sensor and the output of the second metal sensor connect intelligent processing unit, and the servo electrical machinery system motor output signal of telecommunication connects intelligent processing unit, and intelligent processing unit output connects servo electrical machinery system controller；
Described stokehold the second roller-way is L along the length of roller-way conveying direction1, furnace rolls road is L along the length of roller-way conveying direction2, furnace rear roller-way is L along the length of roller-way conveying direction3；
First, steel plate enters charging roller table part, then enters back into the furnace rolls road of induction heater part, and heating system begins to warm up, and when the fully out induction heater of steel plate enters furnace rear roller-way, then all steel plate has reached target temperature and temperature homogeneity；
Described roller table speed closed loop control method is: time on production line without steel plate, the first metal sensor signal S1=0, stokehold the first roller-way keeps V at high speed1, stokehold the second roller-way, furnace rolls road, furnace rear roller-way keep the low velocity V of heating technological requirement2；
Once steel plate enters stokehold the second roller-way, the first metal sensor signal S through stokehold the first roller-way1Being become 1 by 0, described stokehold the first roller table speed is immediately from V1Switch to V2；As the fully out stokehold of steel plate the first roller-way, the first metal sensor signal S1When being become 0 by 1, stokehold the first roller table speed switches to 0；Time delay t=(L1+L2)/V2+L3/V3After, stokehold the first roller table speed switches to V1, the now fully out furnace rear roller-way of steel plate；
Described stokehold the second roller table speed and described furnace rolls road speed are always maintained at V2；
When steel plate leaves induction heater, the second metal sensor signal S2Being become 1 from 0, described furnace rear roller table speed keeps V2, once without steel plate in induction heater, then the second metal sensor signal S2Being become 0 from 1, furnace rear roller table speed switches to rapidly V at high speed3, steel plate quickly leaves roller-way and enters air cooling zone, and furnace rear roller-way is V at high speed3Hold time as t=L3/V3After switch to low velocity V2；
Described steel plate is at full speed V1 entrance when stokehold the first roller-way, and when stokehold the second roller-way, steel plate moves with low velocity V2 and enters to induction heater, and when the fully out induction heater of steel plate enters furnace rear roller-way, then at full speed V3 moves。
If steel plate is without heating, then stokehold the first roller-way, stokehold the second roller-way, furnace rolls road and furnace rear roller table speed are all set as V1 at high speed, and induction heater is quickly opened, and allow steel plate enter steel plate stockpiling area quickly through roller-way。
The roller table speed closed loop control method of on-line continuous induction furnace of the present invention is the velocity close-loop control method setting up continuous moving induction heater charging roller table, furnace rolls road, furnace rear roller-way after rolling on roller-way, and during to ensure strip induction heating tempering, roller speed is accurately controlled。The control method of the present invention is according to the process requirements rolling rear steel plate rapid thermal treatment, the strip of part continuous moving needs after rolling to carry out tempering heat treatment online, therefore the strip of quickly movement after rolling must be slowed down with low speed by online induction heater heating, it is ensured that enough senses heat time heating time to reach the temperature of technological requirement。Without the strip of quick demand for heat then with at a high speed by induction heater chamber after rolling。
The roller table speed closed loop control method of on-line continuous induction furnace of the present invention achieve for have the strip rolling rear prompt tempering demand can the arbitrary speed within the scope of the controlled speed of process requirements enter, by, leave induction heater, and speed is in controllable state, the strip for online induction heater transports the accurate speed controlling of offer。
Accompanying drawing explanation
Fig. 1 is the roller-way structural representation of the on-line continuous induction furnace of the present invention；
Fig. 2 is the schematic top plan view of Fig. 1；
Fig. 3 is embodiments of the invention schematic diagram；
Fig. 4 is the roller table speed closed loop control method flow chart of on-line continuous induction furnace of the present invention；
Fig. 5 is strip and the roller-way speed switching schematic diagram when whole section of online sensing heating；
Fig. 6 is stokehold the first roller table speed switching schematic diagram；
Fig. 7 is furnace rear roller table speed switching schematic diagram。
In figure: 1 stokehold the first roller-way, 2 stokehold the second roller-ways, 3 furnace rolls roads, 4 furnace rear roller-ways, 5 first metal sensors, 6 second metal sensors, 7 induction heaters；8 stokehold the first roller-way servo electrical machinery systems, 9 stokehold the second roller-way servo electrical machinery systems, 10 furnace rolls road servo electrical machinery systems, 11 furnace rear roller-way servo electrical machinery systems, 12 steel plates。
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the invention will be further described。
The roller table speed closed loop control method of a kind of on-line continuous induction furnace relates in stokehold, stove, the roller speed switching of furnace rear conveying roller controls with accurate。The structural representation of whole roller-way is as depicted in figs. 1 and 2。
Steel plate 12 is moved on a production line by roller-way, the roller-way of production line is divided into three parts: charging roller table, furnace rolls road 3 and furnace rear roller-way 4, described charging roller table includes stokehold the first roller-way 1 and stokehold the second roller-way 2, stokehold the first roller-way 1 is for rolling rear high-speed mobile roller-way, and stokehold the second roller-way 2 switches roller-way for speed。It is arranged above the first metal sensor 5, furnace rolls road 3 and furnace rear roller-way 4 intersection at stokehold the first roller-way 1 and the second roller-way 2 intersection and is arranged above the second metal sensor 6。
Described stokehold the first roller-way 1 speed is controlled by stokehold the first roller-way servo electrical machinery system 8, stokehold the second roller-way 2 speed is controlled by stokehold the second roller-way servo electrical machinery system 9, furnace rolls road 3 speed is controlled by furnace rolls road servo electrical machinery system 10, and furnace rear roller-way 4 speed is controlled by furnace rear roller-way servo electrical machinery system 11；Described servo electrical machinery system 8,9,10,11 includes servomotor, controller, reductor, shaft coupling, motor and speed reducer base；Described first metal sensor 5 and the output of the second metal sensor 6 connect intelligent processing unit (not shown in Fig. 3), servo electrical machinery system 8,9,10, the 11 motor output signal of telecommunication connects intelligent processing unit, intelligent processing unit output connects servo electrical machinery system 8,9,10,11 controller, referring to Fig. 3。Wherein furnace rolls road 3 is owing to, inside induction heater 7, furnace rolls road 3 adopts without magnetic conductivity roller-way, and the parts that match with furnace rolls road 3 adopt the matching component of special material。Charging roller table, furnace rolls road, furnace rear roller roller speed rely on servo electrical machinery system to realize being precisely controlled of speed。Owing to line upper plate strip length thickness is unknown, for preventing the different settings of front and back strip collision and difference strip induction heating technology parameter, therefore stokehold the first roller-way enters to whole section of furnace rear roller-way one piece of strip of permission every time。
Described stokehold the second roller-way 2 is L along the length of roller-way conveying direction1, furnace rolls road 3 is L along the length of roller-way conveying direction2, furnace rear roller-way 4 is L along the length of roller-way conveying direction3；
First, steel plate 12 enters charging roller table part, then enters back into the furnace rolls road 3 of induction heater 7 part, and heating system begins to warm up, when the fully out induction heater 7 of steel plate 12 enters furnace rear roller-way 4, then all steel plate has reached target temperature and temperature homogeneity。
Referring to Fig. 4 to Fig. 7, the roller table speed closed loop control method of a kind of on-line continuous induction furnace of the present invention is: time on production line without steel plate, the first metal sensor signal S1=0, stokehold the first roller-way keeps V at high speed1, stokehold the second roller-way, furnace rolls road, furnace rear roller-way keep the low velocity V of heating technological requirement2。
Once steel plate enters stokehold the second roller-way, the first metal sensor signal S through stokehold the first roller-way1Being become 1 by 0, described stokehold the first roller table speed is immediately from V1Switch to V2；As the fully out stokehold of steel plate the first roller-way, the first metal sensor signal S1When being become 0 by 1, stokehold the first roller table speed switches to 0；Time delay t=(L1+L2)/V2+L3/V3After, stokehold the first roller table speed switches to V1, the now fully out furnace rear roller-way of steel plate；Referring to Fig. 5 and Fig. 6。
Described stokehold the second roller table speed and described furnace rolls road speed are always maintained at V2。
When steel plate leaves induction heater, the second metal sensor signal S2Being become 1 from 0, described furnace rear roller table speed keeps V2, once without steel plate in induction heater, then the second metal sensor signal S2Being become 0 from 1, furnace rear roller table speed switches to rapidly V at high speed3, steel plate quickly leaves roller-way and enters air cooling zone, and furnace rear roller-way is V at high speed3Hold time as t=L3/V3After switch to low velocity V2；Referring to Fig. 5 and Fig. 7。
Described steel plate is at full speed V1 entrance when stokehold the first roller-way, and when stokehold the second roller-way, steel plate moves with low velocity V2 and enters to induction heater, and when the fully out induction heater of steel plate enters furnace rear roller-way, then at full speed V3 moves, referring to Fig. 5。
If steel plate is without heating, then stokehold the first roller-way 1, stokehold the second roller-way 2, furnace rolls road 3 and furnace rear roller-way 4 speed are all set as V1 at high speed, and induction heater is quickly opened, and allow steel plate enter steel plate stockpiling area quickly through roller-way。
Embodiment
As shown in Figure 3, the roller table speed closed-loop control system of the present embodiment on-line continuous induction furnace, including: stokehold the first roller-way 1(length 5m), stokehold the second roller-way 2(length 2m), the furnace rolls road 3(length 3m of induction heater), furnace rear roller-way 4(length 5m), first metal sensor 5, second metal sensor 6, stokehold the first roller-way servo electrical machinery system 8, stokehold the second roller-way servo electrical machinery system 9, roller-way support in induction heater, furnace rolls road servo electrical machinery system 10, furnace rear roller-way servo electrical machinery system 11。The sensor signal output of described first metal sensor 5 and the second metal sensor 6 connects intelligent processing unit (not shown in Fig. 3), servo electrical machinery system 8,9,10, the 11 motor output signal of telecommunication connects intelligent processing unit, intelligent processing unit output connects servo electrical machinery system 8,9,10,11 controller, roller-way rotating speed closed loop control flowchart control as shown in Figure 4。
The roller table speed closed loop control method of a kind of on-line continuous induction furnace of the present embodiment is:
When strip after rolling without tempering heat treatment, during with 1.3m/s at high speed by online mobile induction heater, system sets in stokehold, stove according to the speed rolling rear roller-way, the rotating speed of three sections of roller-way servo electrical machinery systems of furnace rear, to ensure that strip passes through induction heater at a high speed；
When strip needs tempering heat treatment after rolling, it is 1.3m/s that strip rolls rear translational speed, it is necessary to enters induction heater to ensure the process requirements of quickly heating with 0.1m/s low velocity, leaves roller-way with 2m/s speed and enter air cooling zone after online tempering。Strip moves with 1.3m/s speed on stokehold the first roller-way 1, when the first metal sensor 5 detected strip by time feed back rising edge signal, stokehold the first roller-way 1 roller speed is switched to 0.1m/s by system immediately, and strip passes through stokehold the second roller-way 2 and furnace rolls road 3 with 0.1m/s。When after the fully out stokehold of strip the first roller-way 1, first metal sensor 5 feeds back trailing edge signal, stokehold the first roller-way 1 roller speed is switched to 0 by system, and after time delay 52.5 seconds, stokehold the first roller-way 1 roller speed is switched to 1.3m/s by system, it is ensured that only has current strip on line and carries out online temper。When the fully out induction heater of strip, second metal sensor 6 feeds back trailing edge signal, furnace rear roller-way 4 roller speed is switched to 2m/s, strip to be able to 2m/s speed and enters air cooling zone by furnace rear roller-way by system, and after time delay 2.5 seconds, furnace rear roller-way 4 roller speed is switched to 0.1m/s by system。
These are only presently preferred embodiments of the present invention, be not intended to limit protection scope of the present invention, therefore, all make within the spirit and principles in the present invention any amendment, equivalent replacement, improvement etc., should be included within protection scope of the present invention。
Claims (2)
1. a roller table speed closed loop control method for on-line continuous induction furnace, is characterized in that:
Steel plate is moved on a production line by roller-way, and the roller-way of production line is divided into three parts: charging roller table, furnace rolls road (3) and furnace rear roller-way (4), and described charging roller table includes stokehold the first roller-way (1) and stokehold the second roller-way (2)；It is arranged above the first metal sensor (5), furnace rolls road (3) and furnace rear roller-way (4) intersection in stokehold the first roller-way (1) and the second roller-way (2) intersection and is arranged above the second metal sensor (6)；
Described stokehold the first roller-way (1) speed is controlled by stokehold the first roller-way servo electrical machinery system (8), stokehold the second roller-way (2) speed is controlled by stokehold the second roller-way servo electrical machinery system (9), furnace rolls road (3) speed is controlled by furnace rolls road servo electrical machinery system (10), and furnace rear roller-way (4) speed is controlled by furnace rear roller-way servo electrical machinery system (11)；Described servo electrical machinery system (8,9,10,11) includes servomotor, controller, reductor, shaft coupling, motor and speed reducer base；Described first metal sensor (5) and the second metal sensor (6) output connect intelligent processing unit, servo electrical machinery system (8,9,10,11) the motor output signal of telecommunication connects intelligent processing unit, and intelligent processing unit output connects servo electrical machinery system (8,9,10,11) controller；
Described stokehold the second roller-way (2) is L along the length of roller-way conveying direction1, furnace rolls road (3) are L along the length of roller-way conveying direction2, furnace rear roller-way (4) is L along the length of roller-way conveying direction3；
First, steel plate (12) enters charging roller table part, then the furnace rolls road (3) of induction heater (7) part is entered back into, heating system begins to warm up, when the fully out induction heater of steel plate (7) enters furnace rear roller-way (4), then all steel plate has reached target temperature and temperature homogeneity；
Described roller table speed closed loop control method is: time on production line without steel plate, the first metal sensor signal S1=0, stokehold the first roller-way keeps V at high speed1, stokehold the second roller-way, furnace rolls road, furnace rear roller-way keep the low velocity V of heating technological requirement2；
Once steel plate enters stokehold the second roller-way, the first metal sensor signal S through stokehold the first roller-way1Being become 1 by 0, described stokehold the first roller table speed is immediately from V1Switch to V2；As the fully out stokehold of steel plate the first roller-way, the first metal sensor signal S1When being become 0 by 1, stokehold the first roller table speed switches to 0；Time delay t=(L1+L2)/V2+L3/V3After, stokehold the first roller table speed switches to V1, the now fully out furnace rear roller-way of steel plate；
Described stokehold the second roller table speed and described furnace rolls road speed are always maintained at V2；
When steel plate leaves induction heater, the second metal sensor signal S2Being become 1 from 0, described furnace rear roller table speed keeps V2, once without steel plate in induction heater, then the second metal sensor signal S2Being become 0 from 1, furnace rear roller table speed switches to rapidly V at high speed3, steel plate quickly leaves roller-way and enters air cooling zone, and furnace rear roller-way is V at high speed3Hold time as t=L3/V3After switch to low velocity V2；
Described steel plate is at full speed V1 entrance when stokehold the first roller-way, and when stokehold the second roller-way, steel plate moves with low velocity V2 and enters to induction heater, and when the fully out induction heater of steel plate enters furnace rear roller-way, then at full speed V3 moves。
2. the roller table speed closed loop control method of on-line continuous induction furnace according to claim 1, it is characterized in that: if steel plate is without heating, then stokehold the first roller-way (1), stokehold the second roller-way (2), furnace rolls road (3) and furnace rear roller-way (4) speed are all set as V1 at high speed, induction heater (7) is quickly opened, and allows steel plate enter steel plate stockpiling area quickly through roller-way。
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| CN201410694408.3A CN105695726B (en) | 2014-11-27 | 2014-11-27 | The roller table speed closed loop control method of on-line continuous induction furnace |
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