CN117336909B - Device and method for improving heating uniformity and heating efficiency of continuous casting and rolling slab - Google Patents
Device and method for improving heating uniformity and heating efficiency of continuous casting and rolling slab Download PDFInfo
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- CN117336909B CN117336909B CN202311618201.3A CN202311618201A CN117336909B CN 117336909 B CN117336909 B CN 117336909B CN 202311618201 A CN202311618201 A CN 202311618201A CN 117336909 B CN117336909 B CN 117336909B
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- 238000005096 rolling process Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims description 22
- 230000006698 induction Effects 0.000 claims abstract description 52
- 230000004907 flux Effects 0.000 claims description 100
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 69
- 229910052802 copper Inorganic materials 0.000 claims description 69
- 239000010949 copper Substances 0.000 claims description 69
- 238000009413 insulation Methods 0.000 claims description 19
- 229910001220 stainless steel Inorganic materials 0.000 claims description 16
- 239000010935 stainless steel Substances 0.000 claims description 16
- 238000001816 cooling Methods 0.000 claims description 14
- 230000007246 mechanism Effects 0.000 claims description 14
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 8
- 238000002955 isolation Methods 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000003745 diagnosis Methods 0.000 claims description 3
- 238000011156 evaluation Methods 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 238000009827 uniform distribution Methods 0.000 claims description 3
- 239000000498 cooling water Substances 0.000 claims description 2
- 238000004321 preservation Methods 0.000 abstract description 8
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
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- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/60—Continuous furnaces for strip or wire with induction heating
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/101—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/14—Tools, e.g. nozzles, rollers, calenders
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/36—Coil arrangements
- H05B6/40—Establishing desired heat distribution, e.g. to heat particular parts of workpieces
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/36—Coil arrangements
- H05B6/44—Coil arrangements having more than one coil or coil segment
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Induction Heating (AREA)
Abstract
The invention relates to the technical field of high-temperature rapid heating of continuous casting and rolling slabs, and provides a device for improving heating uniformity and heating efficiency of continuous casting and rolling slabs, which comprises a plurality of groups of transverse magnetic induction heating devices which are arranged between middle conveying heat preservation roller ways in an inserted manner, wherein each transverse magnetic induction heating device comprises a switch rectifying device, an inversion device, a tank way, a movable trolley device and a plurality of groups of transverse magnetic inductors, the switch rectifying device, the inversion device and the cabinet are placed in an electric room, each movable trolley device comprises a bottom trolley, a top trolley, a bottom rail and a top rail, the bottom rail is used for supporting the bottom trolley to move in and out between the two groups of middle conveying heat preservation roller ways, the top rail is arranged at the top of the bottom trolley and used for supporting the top trolley to move, the power topology structure of the transverse magnetic inductors is an AC-DC-AC frequency conversion structure, and each group of the transverse magnetic inductors comprises an upper inductor and a lower inductor. Through the technical scheme, the problem of poor uniformity and heating efficiency in the heating process of the continuous casting and rolling slab in the prior art is solved.
Description
Technical Field
The invention relates to the technical field of high-temperature rapid heating of continuous casting and rolling slabs, in particular to a device and a method for improving heating uniformity and heating efficiency of continuous casting and rolling slabs.
Background
In the field of slab continuous casting and rolling short processes, an induction heating technology has become an indispensable key link, because the temperature is above 850 ℃, the thickness variation range of a slab is large, longitudinal magnetic induction heating technology is difficult to match, transverse magnetic induction heating technology enters industrial application, wherein the magnetic force line direction of the transverse magnetic induction heating technology is different from that of the longitudinal magnetic induction heating technology, longitudinal magnetic induction heating magnetic force lines penetrate through the surface to a certain depth along the length direction of the slab and cannot penetrate through a core part, one or more pairs of plane inductors are respectively arranged on the upper surface and the lower surface of the slab, the plane inductors which are symmetrically arranged up and down keep the same electrifying direction, and the magnetic force lines of the plane inductors vertically penetrate through the slab after electrifying and heating, so that the slab thickness variation and temperature variation can be adapted under the condition of lower electromagnetic heating frequency.
However, uneven slab surface heating and larger temperature difference are key to restrict the transverse magnetic induction heating technology, the phenomenon of 'cat ear' is fully shown in a continuous casting and rolling production line, the local maximum temperature difference can reach about 100 ℃, meanwhile, the transverse magnetic induction heating efficiency directly influences the power consumption and the comprehensive operation cost of ton steel production, and in order to improve the heating uniformity and the heating efficiency of the continuous casting and rolling slab, the method searches in the related technology:
CN111213432B patent proposes that a flexible cable is used to form an energizing coil, and the shape of the flexible cable is adjusted by a movable insulating roller assembly, so that the inductance is adjusted, and meanwhile, the magnetic field distribution in the width direction of the strip steel or the slab is adjusted, and further, the heating uniformity is improved, but the flexible cable has the limitations of needing large size and fixed support, and the like, along with the change of specifications, the roller assembly is difficult to adjust, and the high-speed operation condition is adjusted, the responsiveness is difficult, and in addition, the surface of the energizing coil is not covered by any magnetic pole, so that the comprehensive efficiency of induction heating is limited.
The CN114981455a patent proposes that symmetrical upper and lower lateral inductors are arranged on the upper and lower surfaces of a metal belt, and a specific lateral induction coil adopts a rounded head in a hammer shape, and the control of heating of the edge is realized by the hammer head structure, but the simple coil structure of the device improves the temperature difference of the edge poorly, and meanwhile, the device also has the problem that the comprehensive efficiency of induction heating is limited because the surface of an energized coil is not covered by any magnetic pole.
The CN108235479B patent proposes that symmetrical transverse induction heaters are arranged on the upper and lower surfaces of the strip steel, and movable adjusting magnetic poles and shielding covers are arranged on the induction heaters, so that heating uniformity and heating efficiency are improved, but for high-power induction heaters, dynamic adjustment of the magnetic poles and the shielding covers has the disadvantages of huge and heavy inductor structure and great adjustment difficulty, and meanwhile, the technology can only realize width direction magnetic pole adjustment, but not coil gap and width direction position adjustment.
Disclosure of Invention
The invention provides a device and a method for improving heating uniformity and heating efficiency of a continuous casting and rolling plate blank, which solve the problem of poor uniformity and heating efficiency in the heating process of the continuous casting and rolling plate blank in the related technology.
The technical scheme of the invention is as follows:
the device for improving the heating uniformity and the heating efficiency of the continuous casting and rolling slab comprises a plurality of groups of transverse magnetic induction heating devices which are arranged between the middle conveying heat preservation roller ways in a penetrating way, wherein the transverse magnetic induction heating devices comprise a switch rectifying device, an inversion device, a tank way, a movable trolley device and a plurality of groups of transverse magnetic induction sensors;
wherein, the switch rectification and the inversion cabinet are placed in an electric room;
the movable trolley device comprises a bottom trolley, a top trolley, a bottom rail and a top rail, wherein the bottom rail is used for supporting the bottom trolley to move in and out between two groups of middle conveying heat preservation roller tables, and the top rail is arranged at the top of the bottom trolley and used for supporting the top trolley to move;
the power topology structure of the transverse magnetic inductor is an AC-DC-AC variable frequency structure, the single group of transverse magnetic inductors comprise an upper inductor and a lower inductor, the bottom trolley and the top trolley are connected with an inductor hoisting frame, hydraulic cylinders are arranged on the inductor hoisting frame, the upper inductor and the lower inductor are respectively arranged on driving rods of the two hydraulic cylinders, and an inductor heat-insulation shielding cover is arranged in a connection area of the upper inductor and the top trolley and a connection area of the lower inductor and the bottom trolley and is used for realizing integral shielding packaging between the movable trolley device and the transverse magnetic inductor;
the tank circuit is divided into an upper path and a lower path, and the upper path and the lower path are respectively and directly combined with each other through flexible copper bars, and are respectively arranged on the bottom trolley and the top trolley.
As a further technical scheme, upper portion inductor with the lower part inductor all includes magnetic flux coil unit, limit portion copper shield, limit portion magnetic pole, distributed magnetic pole, induction coil seal copper shield and inductor insulating layer, the inductor insulating layer magnetic flux coil unit limit portion copper shield limit portion magnetic pole with distributed magnetic pole passes through bolt and condenser tube be connected with the fixed square frame of non-magnetic stainless steel behind the induction coil seal copper shield, the fixed square frame of non-magnetic stainless steel with the output fixed connection of actuating lever of pneumatic cylinder.
As a further technical scheme, the magnetic flux coil units are single-group or multi-group transverse magnetic flux coils, the transverse magnetic flux coils are formed by adopting single-turn or multi-turn copper pipe coils, and the length of straight pipe sections of the transverse magnetic flux coils is not smaller than the maximum width of the slab.
As a further technical scheme, a series connection power-on mode is adopted between the adjacent transverse magnetic flux coils on the upper surface of the slab or the lower surface of the slab, and a reverse power-on mode is kept, and meanwhile, the transverse magnetic flux coils on the upper surface of the slab and the transverse magnetic flux coils on the lower surface of the slab keep the upper power-on direction and the lower power-on direction completely the same.
As a further technical scheme, the side copper shield adopts a planar water-cooling copper plate shielding structure and comprises a copper shield plate, wherein the copper shield plate passes through the transverse magnetic flux coil through a welded water-cooling copper pipe and is connected with the non-magnetic stainless steel fixing square frame, and is insulated and isolated from the transverse magnetic flux coil through an insulating wire plate, and the side copper shield covers 30-80 mm of the blank side of the plate.
As a further technical scheme, the side magnetic poles are formed by superposing a plurality of silicon steel thin strips with the thickness of 0.15-0.3 mm, a plurality of silicon steel thin strips are fixed through a spacing water-cooling copper plate, the side magnetic poles are buckled on the transverse magnetic flux coil in a U-shaped or M-shaped mode, insulation and isolation are carried out through the tetrafluoro strips wound on the transverse magnetic flux coil and the tetrafluoro thin plates between the tetrafluoro strips, and the side magnetic poles are located in the range of 20-80 mm at the edge of the slab.
As a further technical scheme, the distributed magnetic poles are arranged in the middle area of the side magnetic poles, the distributed magnetic poles are 6-12 groups arranged at intervals, a uniform distribution mode is adopted, the distributed magnetic poles are formed by overlapping a plurality of silicon steel thin strips with the thickness of 0.15-0.3 mm, meanwhile, the silicon steel thin strips are fixed through a water-cooling copper plate at intervals, the distributed magnetic poles are buckled on the transverse magnetic flux coil in a U-shaped or M-shaped mode, and insulation and isolation are carried out through the tetrafluoro strips wound on the transverse magnetic flux coil and the tetrafluoro thin plates between the tetrafluoro strips.
As a further technical scheme, the side copper shield and the side magnetic poles are respectively provided with an independent servo mechanism for position adjustment, the servo mechanisms are arranged on the induction coil closed copper shield cover and comprise connecting rods, actuators, sensors and controllers, the adjustment range of the servo mechanisms is that the side copper shield covers 30-80 mm, and the side magnetic poles cover 20-80 mm.
The invention also provides a method for improving the heating uniformity and the heating efficiency of the continuous casting and rolling slab, which comprises the following steps:
s1, on the basis of real-time scanning detection of the outlet temperature of a plate blank, the magnetic flux coil units in a single group of transverse magnetic inductors are staggered in the width direction, a plurality of groups of transverse magnetic inductors are staggered front and back, and the gap height between the upper inductor and the lower inductor is adjusted;
s2, the method for staggering the magnetic flux coil units in the width direction in the single group of transverse magnetic inductors is as follows: the magnetic flux coil units positioned on the upper side and the lower side of the slab are asymmetrically arranged in the arrangement direction, specifically, the magnetic flux coil units positioned on the upper side and the lower side of the slab are closed towards the width center direction of the slab according to the width of the slab, and after the magnetic flux coil units are closed in place, the upper side and the lower side of the edge of the slab are ensured to be covered by one side of the edge copper shield and the edge magnetic pole;
s3, a plurality of groups of transverse magnetic sensors are staggered in the front-back direction, wherein the method comprises the following steps: on the basis of up-and-down interleaving of single groups of transverse magnetic flux inductors, a plurality of groups of transverse magnetic flux inductors are arranged in series in the running direction of a plate blank, and specifically, a plurality of groups of transverse magnetic inductors can enable each group of transverse magnetic inductors to keep a consistent up-and-down magnetic flux coil unit interleaving mode;
s4, a closed-loop control method for improving the uniformity and the comprehensive heating efficiency of the continuous casting and rolling rapid transverse magnetic flux induction heating device is as follows: firstly, slab specification information is acquired, single-group up-and-down interleaving of the transverse magnetic inductors and multiple-group left-and-right interleaving of the transverse magnetic inductors are automatically carried out according to a pre-interleaving rule, evaluation and diagnosis are carried out by combining an outlet plate temperature uniformity detection result, an existing interleaving mode is kept if the deviation between the highest temperature and the lowest temperature is within 10 ℃, and slab specification and interleaving arrangement parameters are stored in a database, if the deviation is higher than the range of 10 ℃, statistical output is carried out in a high-temperature area (L1, L2) and a low-temperature area (L3, L4), single-group up-and-down interleaving of the transverse magnetic inductors and multiple-group left-and-right interleaving fine tuning of the transverse magnetic inductors are carried out according to the area range (comprising side copper shielding and side magnetic pole adjustment), parameter database storage is carried out after uniformity reaches the standard, the position adjustment of the magnetic flux coil units is carried out on the upper and lower sides of the width direction of the slab, the driving side adjustment of the magnetic pole adjustment cylinder is carried out on the upper and lower sides of the upper sensor and the lower sensor through the clearance adjustment of the upper sensor and the lower sensor.
The working principle and the beneficial effects of the invention are as follows:
1. according to the invention, the magnetic field intensity uniformity distribution in the width direction of the plate blank can be improved by adjusting the positions of the upper inductor and the lower inductor in the single group of transverse magnetic inductors along the width direction of the plate blank, the positions of the multiple groups of transverse magnetic induction heating devices along the width direction of the plate blank, the side copper shield, the magnetic poles close to the side and the gaps between the upper and lower transverse magnetic inductors, so that the heating uniformity is improved, the phenomenon of 'cat ears' existing in the coil staggering in the conventional industrial application field is solved to a great extent, the relatively uniform plate blank width temperature is generated, and the positions and the heights of the upper and lower inductors can be flexibly and conveniently adjusted.
2. According to the invention, the side magnetic poles and the distributed magnetic poles are introduced into the transverse magnetic flux induction heating device of the continuous casting and rolling slab, so that the magnetic focusing effect can be greatly improved, the heating efficiency of the transverse magnetic flux coil is improved, the overall comprehensive heating efficiency is further improved, and the power consumption per ton of steel is reduced.
Therefore, the invention effectively solves the problem of difficult points in transverse magnetic flux induction heating, effectively improves the comprehensive heating efficiency of transverse magnetic flux induction heating, can adapt to the uniformity distribution of the heating temperature of the slabs with different widths, and can improve the heating uniformity of the slab width direction and the comprehensive efficiency of the whole set of transverse magnetic induction heating device on the basis of adapting to the abnormal conditions of slab plate types, head-to-tail head warping, tail-to-tail lapping and other defect control adjustment, thereby having positive effects and practical economic values for improving the continuous casting and rolling production quality and efficiency.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is a schematic diagram of a mobile cart device and a transverse magnetic sensor in the invention;
FIG. 2 is a schematic diagram of a transverse magnetic inductor and a slab according to the present invention;
FIG. 3 is a schematic view of three types of structures of transverse flux coils of the present invention using multi-turn copper tubing coils;
FIG. 4 is a schematic diagram of a magnetic flux coil unit with multiple sets of transverse magnetic flux coils according to the present invention;
FIG. 5 is a schematic illustration of three types of configurations of transverse flux coils of the present invention using single turn copper tubing coils;
FIG. 6 is a schematic diagram of a single set of transverse flux coils of the flux coil unit of the present invention;
FIG. 7 is a schematic diagram of the magnetic flux coil units of the multi-group transverse magnetic sensor of the present invention staggered back and forth;
FIG. 8 is a logic diagram of a closed-loop control method for improving the uniformity and the comprehensive heating efficiency of a continuous casting and rolling rapid transverse magnetic flux induction heating device according to the invention;
FIG. 9 is a schematic diagram of the transverse magnetic sensor gap positioning control of the present invention.
In the figure:
1. a bottom trolley; 2. a top cart; 3. a bottom rail; 4. a top rail; 5. an upper sensor; 6. a lower inductor; 7. hoisting a frame by an inductor; 8. a hydraulic cylinder; 9. a tank circuit cabinet; 10. a main frame of the trolley; 100. a slab; 101. a magnetic flux coil unit; 102. edge copper shielding; 103. a side magnetic pole; 104. a distributed magnetic pole; 105. the induction coil seals the copper shielding cover; 106. and an inductor heat insulation layer.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 to 9, the embodiment proposes a device for improving heating uniformity and heating efficiency of a continuous casting and rolling slab, which comprises a plurality of groups of transverse magnetic induction heating devices arranged between middle conveying heat preservation roller tables in a penetrating way, wherein the transverse magnetic induction heating devices comprise a switch rectifying device, an inversion device, a tank circuit, a travelling trolley device and a plurality of groups of transverse magnetic inductors;
wherein, the switch rectifying and inverting cabinet is placed in an electric room;
as shown in fig. 1, the moving trolley device comprises a bottom trolley 1, a top trolley 2, a bottom rail 3 and a top rail 4, wherein the bottom rail 3 is used for supporting the bottom trolley 1 to move in and out between two groups of middle conveying heat preservation roller tables, and the top rail 4 is arranged at the top of the bottom trolley 1 and used for supporting the top trolley 2 to move.
The bottom trolley 1 and the top trolley 2 comprise a trolley main frame 10 (highly integrated with a water pipeline), wheels and a driving mechanism for driving the wheels to move, wherein the trolley main frame 10 is manufactured by welding a nonmagnetic stainless steel water cooling pipeline, the wheels have anti-tipping and locking functions, and the driving mechanism is combined with the wheel shafts of the wheels and is used for driving the bottom trolley 1 and the top trolley 2 to horizontally move.
The power topology structure of the transverse magnetic inductor is an AC-DC-AC frequency conversion structure, the grid-side power frequency alternating current is rectified into pulsating direct current by the silicon controlled rectifier, the rectified pulsating direct current is filtered into smooth direct current by the direct current filter and is fed to the intermediate frequency inverter, in order to realize high-efficiency high-frequency energy output, the intermediate frequency inverter needs to work in a resonance state, namely a zero current commutation mode (ZCS) or a zero voltage commutation mode (ZVS), the resonance frequency of the intermediate frequency inverter depends on the inherent resonance frequency of a circuit determined by inductance parameters of the impedance matcher (line transmission inductance+matching transformer leakage inductance+inductor inductance), and resonance capacitance parameters, and the solid intermediate frequency power supply adopts a series resonance and inversion side power regulation method.
As shown in fig. 1 to 2, the single group of transverse magnetic inductors comprise an upper inductor 5 and a lower inductor 6, the bottom trolley 1 and the top trolley 2 are connected with an inductor hoisting frame 7, hydraulic cylinders 8 are mounted on the inductor hoisting frame 7, the upper inductor 5 and the lower inductor 6 are respectively mounted on driving rods of the two hydraulic cylinders 8, an inductor heat-insulation shielding cover is arranged in a connection area of the upper inductor 5 and the trolley main frame 10 of the top trolley 2, and an insulation shielding cover is arranged in a connection area of the lower inductor 6 and the trolley main frame 10 of the bottom trolley 1 for isolation protection, and a circulating cooling device is arranged for strengthening internal space cooling for realizing integral shielding packaging between a movable trolley device and the transverse magnetic inductors.
The inductor hoisting frame 7 is integrated with the trolley main frame 10, the upper inductor 5 and the lower inductor 6 are respectively and directly installed in the trolley main frame 10 of the top trolley 2 and the bottom trolley 1, the tank is divided into an upper tank and a lower tank, the upper inductor 5 and the lower inductor 6 are respectively combined with each other in the tank cabinet 9 and are respectively arranged on the bottom trolley 1 and the top trolley 2, flexible copper bars are respectively adopted between the upper inductor 5 and the tank matched tank cabinet 9, and between the lower inductor 6 and the tank matched tank cabinet 9, so that the inductance value can be reduced, the two tank can be connected by a split flexible water-cooled cable, and the comprehensive heating efficiency is improved.
In this embodiment, the upper inductor 5 and the lower inductor 6 each include a magnetic flux coil unit 101, an edge copper shield 102, an edge magnetic pole 103, a distributed magnetic pole 104, an induction coil enclosed copper shield 105 and an inductor heat insulation layer 106, the magnetic flux coil unit 101, the edge copper shield 102, the edge magnetic pole 103 and the distributed magnetic pole 104 are connected with a non-magnetic stainless steel fixed frame after passing through the induction coil enclosed copper shield 105 through bolts and cooling water pipes, and the non-magnetic stainless steel fixed frame is fixedly connected with the output end of a driving rod of the hydraulic cylinder 8, and the non-magnetic stainless steel fixed frame is driven by the hydraulic cylinder 8 to realize height adjustment.
As shown in fig. 3 to 6, in this embodiment, the magnetic flux coil unit 101 is a single set (see fig. 6) or multiple sets (see fig. 4) of transverse magnetic flux coils, the transverse magnetic flux coils are formed by single-turn (see fig. 5) or multi-turn (see fig. 3) copper tube coils, the coil heads are in arc-shaped head structures, the length of straight tube sections of the transverse magnetic flux coils is not less than the maximum width of the slab 100, and the multi-turn copper tube coils are provided with water flow branches at intervals according to the circulation length and the water flow branch light paths of the multi-turn copper tube coils are all arranged at the arc-shaped end positions of the coils due to the copper tube coil cooling effect and the arrangement convenience angle of the side magnetic poles 103 and the distributed magnetic poles 104.
In this embodiment, a serial conduction mode is adopted between adjacent transverse magnetic flux coils located on the upper surface of the slab 100 or the lower surface of the slab 100, and a reverse conduction mode is maintained, by using this conduction mode, the magnetic field intensity between loops can be weakened, heating reinforcement is avoided, and meanwhile, the transverse magnetic flux coils on the upper surface of the slab 100 and the transverse magnetic flux coils on the lower surface of the slab 100 keep the upper and lower conduction directions identical.
In this embodiment, the side copper shield 102 adopts a planar water-cooled copper plate shielding structure, and comprises a copper shield plate, wherein the copper shield plate passes through a transverse magnetic flux coil through a welded water-cooled copper pipe and is connected with a non-magnetic stainless steel fixing frame, and is insulated and isolated from the transverse magnetic flux coil through an insulating wire plate, so that the side copper shield 102 covers 30-80 mm of the side of the slab 100 based on avoiding the local high temperature of 10-30 mm of the side of the slab 100.
In this embodiment, the side magnetic pole 103 is formed by overlapping a plurality of silicon steel thin strips with the thickness of 0.15 mm-0.3 mm, meanwhile, the silicon steel thin strips are fixed by a spacing water-cooled copper plate, the side magnetic pole 103 is buckled on the transverse magnetic flux coil in a U shape or an M shape, insulation and isolation are performed by a tetrafluoro strip wound on the transverse magnetic flux coil and a tetrafluoro thin plate (1 mm) between the tetrafluoro strip and the tetrafluoro thin plate, and the side magnetic pole is positioned in the range of 20-80 mm at the side of the slab 100 based on the improvement of the local low temperature of 30-50 mm at the side of the slab 100.
In this embodiment, the distributed magnetic poles 104 are arranged in the middle area of the side magnetic poles 103, the distributed magnetic poles 104 are 6-12 groups arranged at intervals, a uniform distribution mode is adopted, the distributed magnetic poles 104 are also formed by overlapping a plurality of silicon steel thin strips with the thickness of 0.15-0.3 mm, meanwhile, the silicon steel thin strips are fixed through a water-cooled copper plate at intervals, the distributed magnetic poles 104 are buckled on the transverse magnetic flux coil in a U shape or an M shape, insulation and isolation are carried out through a tetrafluoro strip wound on the transverse magnetic flux coil and a tetrafluoro thin plate (1 mm) between the tetrafluoro strip and the transverse magnetic flux sensors, and the front and rear groups of transverse magnetic flux sensors adopt a position staggered mode.
The transverse magnetic flux coil, the side copper shield 102, the side magnetic poles 103, the distributed magnetic poles 104 and the enclosed copper plate of the magnetic flux coil unit 101 are in a layered combination mode, and the heat-resistant high-strength heat insulation plate, the heat insulation cotton, the combined body (the transverse magnetic flux coil, the side copper shield 102, the side magnetic poles 103 and the distributed magnetic poles 104) and the enclosed copper shield plate are sequentially arranged from the close to the top surface of the heating plate blank 100 to the side copper shield 102.
The inductor heat preservation shielding cover comprises an inner layer non-magnetic stainless steel sheet, heat insulation aerogel, a heat preservation cloth plate and an outer layer non-magnetic stainless steel sheet. The inner and outer non-magnetic stainless steel sheets are 1-2 mm non-magnetic stainless steel sheets, the heat insulation aerogel is 5-10 mm medium temperature aerogel, the heat insulation cloth plate is 3-5 mm heat-resistant cloth plate, and the outer non-magnetic stainless steel sheets are provided with expansion joints so as to adapt to the continuous casting and rolling high-temperature environment.
The circulating cooling device in the main frame 10 of the trolley is composed of a side circulating air inlet device and a top circulating air exhaust device, the side circulating air inlet device is used for blowing purified cooling air in by an air blower, and the top circulating air exhaust device adopts pumping and exhausting assistance to realize blowing and exhausting.
In this embodiment, the side copper shield 102 and the side magnetic pole 103 are respectively provided with an independent servo mechanism for position adjustment, the servo mechanism is arranged on the induction coil closed copper shield 105 and consists of a connecting rod, an actuator, a sensor and a controller, and the adjustment range of the servo mechanism is that the side copper shield 102 covers 30-80 mm and the side magnetic pole 103 covers 20-80 mm.
The invention also provides a method for improving the heating uniformity and the heating efficiency of the continuous casting and rolling slab, and the device for improving the heating uniformity and the heating efficiency of the continuous casting and rolling slab comprises the following steps:
on the basis of real-time scanning detection of the outlet temperature of the slab 100, the magnetic flux coil units 101 in the single-group transverse magnetic inductors are staggered in the width direction, the multiple groups of transverse magnetic inductors are staggered front and back, the gap height between the upper inductor 5 and the lower inductor 6 is adjusted, and the uniformity distribution adjustment of transverse magnetic fields can be realized, meanwhile, the uniformity of the distributed magnetic poles 104 is realized, the staggered distribution improves the heating efficiency of the inductors, and further the comprehensive heating efficiency of transverse magnetic induction heating is improved.
The method for real-time scanning and detecting the outlet temperature of the slab 100 comprises the steps of adopting a point type infrared thermometer moving scanning mode, a linear infrared imager, a surface infrared imager or the like, and self-learning and guiding on-line adjustment and optimization of a transverse magnetic flux induction heating combined device of the continuously cast and continuously rolled slab 100 through visual temperature detection results in the width direction of the slab 100, so that the uniformity of the slab 100 in the heating width direction is improved and ensured.
The method of interleaving the magnetic flux coil units 101 in the width direction in the single group of transverse magnetic inductors is as follows: the magnetic flux coil units 101 located above and below the slab 100 are asymmetrically arranged in the arrangement direction, specifically, according to the width of the slab 100, the magnetic flux coil units 101 located above and below the slab 100 are closed towards the width center direction of the slab 100, after the magnetic flux coil units are closed in place, it is ensured that the edges of the slab 100 are covered by one side of the edge copper shield 102 and the edge magnetic poles 103, meanwhile, the distributed magnetic poles 104 are effectively staggered up and down by the staggering of the upper induction coil and the lower induction coil, the maximum magnetism collecting effect is formed, and in this way, the edge heating uniformity and the inductor heating efficiency can be improved.
The method for the front-back interleaving of the plurality of groups of transverse magnetic sensors comprises the following steps: on the basis that single-group transverse magnetic flux inductors are staggered up and down, multiple groups of transverse magnetic flux inductors are arranged in series in the running direction of the slab 100, specifically, multiple groups of transverse magnetic inductors can enable each group of transverse magnetic inductors to keep a uniform up-down magnetic flux coil unit 101 staggered mode, and further uniformity improvement can be achieved through front-back fine adjustment according to actual temperature measurement uniformity.
As shown in fig. 8, the closed-loop control method for improving the uniformity and the comprehensive heating efficiency of the continuous casting and rolling rapid transverse magnetic flux induction heating device is as follows: firstly, obtaining specification information of a plate blank 100, automatically performing up-and-down interleaving of single-group transverse magnetic inductors and left-and-right interleaving of multiple-group transverse magnetic inductors along the running direction of the plate blank 100 according to a pre-interleaving rule, then performing evaluation and diagnosis by combining an outlet plate temperature uniformity detection result, if the deviation between the highest/lowest temperature and the average temperature is within 10 ℃, maintaining the existing interleaving mode, storing a database of parameters of the specification and the interleaving arrangement of the plate blank 100, if the deviation is higher than the range of 10 ℃, performing statistics output of the high-temperature areas (L1 and L2) and the low-temperature areas (L3 and L4), performing up-and-down interleaving of the single-group transverse magnetic inductors and left-and-right interleaving fine tuning (comprising edge copper shielding 102 and edge magnetic pole 103 adjustment) of the multiple-group transverse magnetic inductors according to the area range, performing control adjustment through a PLC system, performing parameter database storage after uniformity is up-and-down magnetic flux coil unit 101 position adjustment in the width direction of the plate blank 100, performing gap height adjustment between the upper sensor and the lower sensor 6 through movement of a bottom trolley 1 and a top trolley 2, performing driving edge magnetic pole 102 adjustment through an edge shielding 8 and a servo magnetic pole 103 adjustment mechanism.
As shown in fig. 9, the PLC staggered control adjustment actuator of the transverse magnetic sensor is shown in fig. 7, wherein the top trolley 2 is locked on the guide rail of the bottom trolley 1, the bottom trolley 1 is moved to the working position by the driving mechanism according to the slab 100 specification control program, then the locking device of the top trolley 2 is opened, the top trolley 2 is moved and adjusted to the horizontal working position in the width direction of the slab 100 by the driving mechanism of the top trolley 2, and then the height of the upper sensor 5 is adjusted by the hydraulic cylinder 8 of the top trolley 2, so that the transverse magnetic flux induction coil unit carried by the top trolley 2 is ensured to be adjusted to the working position. And finally, the height of the hydraulic cylinder 8 is adjusted through the inductor 6 at the lower part of the bottom trolley 1, so that the transverse magnetic flux induction coil unit worn by the bottom trolley 1 is ensured to be adjusted to a working position.
In the process of conducting staggered fine adjustment of the transverse magnetic flux induction coils according to the scanning detection result of the outlet temperature of the slab 100, each group of mobile trolleys is correspondingly fine-adjusted according to the calculation result of the fine adjustment algorithm of the control program, and the specific adjustment mode is that the fine adjustment of the bottom trolley 1 is firstly conducted, and then the fine adjustment of the top trolley 2 is conducted.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (5)
1. The device for improving the heating uniformity and the heating efficiency of the continuous casting and rolling slab is characterized by comprising a switch rectifying device, an inversion device, a tank way, a movable trolley device and a plurality of groups of transverse magnetic sensors;
wherein, the switch rectification and the inversion cabinet are placed in an electric room;
the movable trolley device comprises a bottom trolley (1), a top trolley (2), a bottom rail (3) and a top rail (4), wherein the bottom rail (3) is used for supporting the bottom trolley (1) to move in and out between two groups of middle conveying heat-preserving roller tables, and the top rail (4) is arranged at the top of the bottom trolley (1) and used for supporting the top trolley (2) to move;
the power topology structure of the transverse magnetic inductor is an AC-DC-AC variable frequency structure, the single group of transverse magnetic inductors comprise an upper inductor (5) and a lower inductor (6), the bottom trolley (1) and the top trolley (2) are connected with an inductor hoisting frame (7), the inductor hoisting frame (7) is provided with a hydraulic cylinder (8), the upper inductor (5) and the lower inductor (6) are respectively arranged on driving rods of the two hydraulic cylinders (8), and the connecting area of the upper inductor (5) and the top trolley (2) and the connecting area of the lower inductor (6) and the bottom trolley (1) are respectively provided with an inductor heat-insulation shielding cover for realizing integral shielding packaging between the movable trolley device and the transverse magnetic inductor;
the tank way is divided into an upper path and a lower path, and the upper sensor (5) and the lower sensor (6) are respectively combined in a tank way cabinet (9) and are respectively arranged on the bottom trolley (1) and the top trolley (2);
the upper inductor (5) and the lower inductor (6) comprise a magnetic flux coil unit (101), an edge copper shield (102), an edge magnetic pole (103), a distributed magnetic pole (104), an induction coil closed copper shield cover (105) and an inductor heat insulation layer (106), wherein the inductor heat insulation layer (106), the magnetic flux coil unit (101), the edge copper shield (102), the edge magnetic pole (103) and the distributed magnetic pole (104) penetrate through the induction coil closed copper shield cover (105) through bolts and cooling water pipes and then are connected with a non-magnetic stainless steel fixing box, and the non-magnetic stainless steel fixing box is fixedly connected with the output end of a driving rod of the hydraulic cylinder (8);
the magnetic flux coil units (101) are a plurality of groups of transverse magnetic flux coils, the transverse magnetic flux coils are formed by adopting multi-turn copper pipe coils, and the length of straight pipe sections of the transverse magnetic flux coils is not less than the maximum width of the slab (100);
the side magnetic pole (103) is formed by superposing a plurality of silicon steel thin strips with the thickness of 0.15-0.3 mm, a plurality of silicon steel thin strips are fixed through a spacing water-cooling copper plate, the side magnetic pole (103) is buckled on the transverse magnetic flux coil in a U shape or an M shape, insulation and isolation are carried out through a tetrafluoro strip wound on the transverse magnetic flux coil and a tetrafluoro thin plate between the tetrafluoro strips, and the side magnetic pole is positioned at the edge of the slab (100) within the range of 20-80 mm;
the distributed magnetic poles (104) are arranged in the middle area of the side magnetic poles (103), the distributed magnetic poles (104) are 6-12 groups which are arranged at intervals, a uniform distribution mode is adopted, the distributed magnetic poles (104) are formed by overlapping a plurality of silicon steel thin strips with the thickness of 0.15-0.3 mm, meanwhile, the silicon steel thin strips are fixed through a water-cooling copper plate at intervals, the distributed magnetic poles (104) are buckled on the transverse magnetic flux coil in a U-shaped or M-shaped mode, and insulation and isolation are carried out through the tetrafluoro strips wound on the transverse magnetic flux coil and the tetrafluoro thin plates between the tetrafluoro strips.
2. The apparatus for improving heating uniformity and heating efficiency of a continuous casting and rolling slab according to claim 1, wherein a series energization mode is adopted between adjacent transverse flux coils located on an upper surface of the slab (100) or a lower surface of the slab (100), and a reverse energization mode is maintained while the transverse flux coils on the upper surface of the slab (100) and the transverse flux coils on the lower surface of the slab (100) are maintained to have identical upper and lower energization directions.
3. The device for improving the heating uniformity and the heating efficiency of the continuous casting and rolling slab according to claim 2, wherein the side copper shield (102) adopts a planar water-cooling copper plate shielding structure and comprises a copper shielding plate, the copper shielding plate penetrates through the transverse magnetic flux coil through a welded water-cooling copper pipe and is connected with the non-magnetic stainless steel fixing frame, and is insulated and isolated from the transverse magnetic flux coil through an insulating wire plate, and the side copper shield (102) covers 30-80 mm of the side part of the slab (100).
4. The device for improving heating uniformity and heating efficiency of continuous casting and rolling slabs according to claim 3, wherein the side copper shield (102) and the side magnetic pole (103) are respectively provided with an independent servo mechanism for position adjustment, the servo mechanism is arranged on the induction coil closed copper shield cover (105) and consists of a connecting rod, an actuator, a sensor and a controller, and the adjustment range of the servo mechanism is that the side copper shield (102) covers 30-70 mm, and the side magnetic pole (103) covers 20-80 mm.
5. A method for improving heating uniformity and heating efficiency of a continuous casting and rolling slab, characterized in that the device for improving heating uniformity and heating efficiency of a continuous casting and rolling slab according to claim 4 comprises the following steps:
s1, on the basis of real-time scanning detection of the outlet temperature of a plate blank (100), the magnetic flux coil units (101) in a single group of transverse magnetic sensors are staggered in the width direction, a plurality of groups of transverse magnetic sensors are staggered front and back, and the gap height between the upper sensor (5) and the lower sensor (6) is adjusted;
s2, the method for interleaving the magnetic flux coil units (101) in the single group of transverse magnetic inductors in the width direction is as follows: the magnetic flux coil units (101) positioned above and below the slab (100) are asymmetrically arranged in the arrangement direction, specifically, the magnetic flux coil units (101) positioned above and below the slab (100) are closed towards the width center direction of the slab (100) according to the width of the slab (100), and after the magnetic flux coil units are closed in place, one side of the copper shielding (102) at the edge and one side of the magnetic pole (103) at the edge of the slab (100) are covered;
s3, a plurality of groups of transverse magnetic sensors are staggered in the front-back direction, wherein the method comprises the following steps: on the basis of up-down interleaving of single groups of transverse magnetic flux inductors, the transverse magnetic flux inductors are arranged in series in the running direction of the slab (100), and specifically, the transverse magnetic inductors can keep the same up-down interleaving mode of the magnetic flux coil units (101);
s4, a closed-loop control method for improving the uniformity and the comprehensive heating efficiency of the continuous casting and rolling rapid transverse magnetic flux induction heating device is as follows: firstly, obtaining specification information of a plate blank (100), automatically carrying out up-and-down interlacing of a single group of transverse magnetic inductors and left-and-right interlacing of a plurality of groups of transverse magnetic inductors along the running direction of the plate blank (100) according to a pre-interlacing rule, then carrying out evaluation and diagnosis by combining an outlet plate temperature uniformity detection result, if the deviation between the highest/lowest temperature and the average temperature is within 10 ℃, keeping the existing interlacing mode, storing parameters of the specification and the interlacing arrangement of the plate blank (100) in a database, if the deviation is higher than the range of the deviation in 10 ℃, carrying out statistic output of high-temperature areas (L1 and L2) and low-temperature areas (L3 and L4), carrying out up-and-down interlacing of the single group of transverse magnetic inductors and left-and-right interlacing fine tuning calculation of the plurality of groups of transverse magnetic inductors according to the range of the area, and carrying out fine tuning calculation to form an edge interlacing fine tuning scheme, wherein the fine tuning covers an edge copper shield (102) and an edge magnetic pole (103), carrying out control and adjustment through a PLC system, carrying out parameter database storage after uniformity is up-to the standard, carrying out position adjustment on an upper magnetic flux coil unit (101) in the width direction of the plate blank (100), carrying out the magnetic flux coil unit (1) on the upper and lower magnetic flux coil unit (1) in the width direction, and an induction unit (101) in the width direction, and an induction part (5) of the magnetic flux sensor (2) are driven by a servo motor (5), and an induction part is adjusted by the upper induction part (2) and a lower induction part (5) and a magnetic sensor is adjusted by a magnetic sensor.
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