CN101120616A - Induction heating device and method for metal plate - Google Patents
Induction heating device and method for metal plate Download PDFInfo
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- CN101120616A CN101120616A CNA2006800048926A CN200680004892A CN101120616A CN 101120616 A CN101120616 A CN 101120616A CN A2006800048926 A CNA2006800048926 A CN A2006800048926A CN 200680004892 A CN200680004892 A CN 200680004892A CN 101120616 A CN101120616 A CN 101120616A
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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
- H05B6/103—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces multiple metal pieces successively being moved close to the inductor
- H05B6/104—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces multiple metal pieces successively being moved close to the inductor metal pieces being elongated like wires or bands
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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
- H05B6/36—Coil arrangements
- H05B6/44—Coil arrangements having more than one coil or coil segment
-
- 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
- H05B2206/00—Aspects relating to heating by electric, magnetic, or electromagnetic fields covered by group H05B6/00
- H05B2206/02—Induction heating
- H05B2206/023—Induction heating using the curie point of the material in which heating current is being generated to control the heating temperature
Abstract
An induction heating apparatus for heating a traveling metal plate includes an induction coil for surrounding the metal plate. The induction coil includes an upper induction coil for being located above the metal plate and a lower induction coil for being located below the metal plate. The upper and lower induction coils are spaced from each other in a longitudinal direction of the metal plate a constant distance across a transverse direction of the metal plate. Each of the upper induction coil and the lower induction coil is arranged obliquely at an edge area of the metal plate so as to form an oblique angle with the transverse direction of the metal plate.
Description
The cross reference of related application
This non-provisional application requires on February 18th, 2005 and on September 5th, 2005 respectively in the patent application No.2005-41944 of Japan's submission and the priority of No.2005-256334 according to 35U.S.C. § 119 (a).The whole contents of each of these two patent applications is introduced by reference at this.
Technical field
The present invention relates to a kind of induction heating equipment that is used for such as the metallic plate of steel plate or aluminium sheet.The invention particularly relates to a kind of by utilizing induction coil in metallic plate, to produce induced current and the induction heating equipment of metal heating plate around metallic plate.The invention still further relates to a kind of induction heating equipment, this equipment is metal heating plate expeditiously, and no matter whether the thickness of metallic plate and metallic plate are magnetic or nonmagnetic.The invention still further relates to a kind of induction heating equipment, this induction heating equipment can be controlled the Temperature Distribution on horizontal (width) direction of metallic plate, and, have the metallic plate that more uniform temperature distributes thereby after heating, form no matter existing Temperature Distribution how before heating.
Background technology
Utilize the indirect heated component of gas or electricity or utilize the direct firing equipment of induction heating to be used for metal heating plate, with the quality of control metal material in Technology for Heating Processing.Because directly firing equipment does not have thermal inertia, be different from indirect heated component, reach the stable needed time of furnace temperature so direct firing equipment can be saved indirect heated component, and can easily control firing rate, for example, when plate thickness changes.So directly firing equipment does not need to change the transporting velocity of metallic plate, has avoided the productivity ratio reduction like this.
Existing two types the induction heating equipment that is used for metallic plate.One type is LF type (longitudinal flux flux type), and wherein metallic plate heats by utilizing induction coil around metallic plate to produce circular induced current in the cross section of metallic plate, and wherein induction coil applies frequency range usually from the interchange of 1KHz to 500KHz.Fig. 1 shows the schematic diagram of LF type induction heating equipment.Fig. 2 shows the circular induced current of utilizing LF type induction heating equipment to produce in cross section.In Fig. 1, the induction coil 2 that is connected in AC power supplies 3 is around metallic plate 1.When elementary electric current 5 during through induction coils 2, magnetic flux 4 penetrating metal plates 1 and around magnetic flux 4, produce induced current.In Fig. 2, the induced current 6 that produces in the cross section of metallic plate 1 flows along the direction opposite with the primary current 5 of the induction coil 2 that lays respectively at metallic plate 1 above and below of flowing through.Another kind of type is TF type (a transverse flux type), and the induction coil that wherein has magnetic core lays respectively at the above and below of metallic plate.When opening for the AC power supplies of coil power supply, magnetic flux penetrates the metallic plate between the magnetic core and produces induced current along the thickness direction of plate, makes the metallic plate heating.
Add in the TF type and to pine for, induced current concentrates on the lateral end zone of metallic plate, and near the current density this end regions reduces simultaneously, and this causes the heating back to produce uneven Temperature Distribution easily on lateral.Especially, when the magnetic core of induction coil and the relation of the position between the metallic plate because the variation of metallic plate width or metallic plate crawls preceding and then when changing, more be difficult to provide uniform heating.In background technology, proposed to use the technology of diamond-type coil, thereby by making diamond-type coil tilt to make the magnetic flux whole width of penetrating metal plate always when the change width of metallic plate.Yet this technology utilization is from induction coil leaked magnetic flux amount, and this needs metallic plate and induction coil adjacent to each other.In addition, rotating mechanism is installed and has increased the difficulty of on commercial scale, implementing this technology on the induction heating equipment of the big electric current of supply.
LF type heating is a kind of method that is used to heat the metallic plate of sensed coil encircling, and this coil can be guaranteed to produce circular induced current in metallic plate, thereby heats this plate.The induced current that produces in the cross section of metallic plate in the LF type concentrates on the degree of depth of representing with following formula " d " and locates:
d[mm]＝5.03×10
+5×(ρ/μrf)
0.5(1)
Wherein d is induced current depth of penetration [mm], and ρ is resistivity [Ω m], and μ r is a relative permeability, and f is a heating frequency [Hz].
Induced current depth of penetration increases along with the increase of metal temperature, because resistivity increases when the temperature of metal increases.The relative permeability of ferrimagnet or paramagnetic material is along with temperature descends near Curie point, and finally the temperature place above Curie point becomes 1.This means that induced current depth of penetration increases with temperature.Because the relative permeability of nonmagnetic substance is 1, its induced current depth of penetration is compared bigger with magnetic material.
In LF type induction heating, if induced current depth of penetration is big, and the thin thickness of metallic plate, induced current that produces in the top of metal and the induced current that produces in the lower part of metal are cancelled each other so.This causes the efficient that heats lower.
For example, if use the heating frequency of 10KHz, so at room temperature induced current depth of penetration for the aluminium of nonmagnetic substance, be about 1mm, for stainless steel 304 (SUS304) about 4.4mm, for the steel of magnetic material about 0.2mm.The about 5mm of penetration of current of the temperature steel more than Curie point (about 750 ℃).The steel plate that great majority are used for automobile and household electrical appliance has the thickness that is not more than 2mm, and wherein automobile and household electrical appliance are to use the primary commercial product of metallic plate.So being difficult to is not usually having as mentioned above to heat this metallic plate expeditiously under the faradic situation that is cancelled in the top of metallic plate and lower part.Can expect,,, thereby can avoid faradic counteracting so that the degree of depth that induced current is penetrated is more shallow with being supplied to the AC power frequency of LF type induction heating equipment to be increased to hundreds of KHz; Yet, use on commercial scale that to have high-frequency high-current supply like this be not very actual.
Proposed to use the induction heating equipment of a kind of like this employing around the induction coil of metallic plate, this equipment is metal heating plate expeditiously, even metallic plate at high temperature and/or be metal sheet.In such induction heating equipment, be positioned at the induction coil (upper induction coil) of metallic plate top and be positioned at another induction coil (lower induction coil) layout parallel to each other below the metallic plate, thereby lay respectively at along positions different on the longitudinal direction of metallic plate.In other words, two projected images of upper induction coil and lower induction coil are parallel to each other, and along positions different on the longitudinal direction of metallic plate, wherein two projected images form by these two induction coils of upright projection on metallic plate respectively.
Fig. 3 is the schematic diagram of above-mentioned induction heating equipment, another induction coil 2b (lower induction coil) that wherein is positioned at the induction coil 2a (upper induction coil) of metallic plate 1 top and is positioned at metallic plate 1 below arranges parallel to each other, and along positions different on the longitudinal direction of metallic plate.Reference numeral 7 and 8 is represented conductive component and AC power supplies 8 respectively.Fig. 4 A shows faradic the flowing in metallic plate 1 when upper induction coil and lower induction coil are arranged in positions different on the longitudinal direction of metallic plate with 4B.Fig. 4 A shows from the schematic diagram of the observed induced current state in metallic plate top.Fig. 4 B is the cross-sectional view that the line 4B-4B along Fig. 4 A makes.Faradic the flowing of Reference numeral 10 expressions in Fig. 4 A.When upper induction coil and lower induction coil were arranged in positions different on the longitudinal direction of metallic plate, the upper path of the circular induced current that produces in metallic plate also laid respectively at along positions different on the longitudinal direction of metallic plate with lower path.So when faradic penetration depth is big, even the temperature height of metallic plate and/or metallic plate be when thin, can be under the situation that the induced current in top that does not have metallic plate and the lower part is offset metal heating plate expeditiously.
Yet, be arranged in along the use of the induction heating equipment of positions different on the longitudinal direction of metallic plate in this upper induction coil and lower induction coil, compare may be overheated in the central area of metallic plate on the fringe region of metallic plate on the Width and Width.This may cause in a lateral direction the final temperature of uneven Temperature Distribution as metallic plate.
Experience this phenomenon and be because narrower than the top of metallic plate and the width of the induced current path in the lower part (corresponding to " d1 " among Fig. 4 A) at the width (corresponding to " d2 " among Fig. 4 A) of the induced current path in metal-sheet edges zone, wherein the edge region electric current flows to the lower part from the top of metallic plate.So, current density height in the current density ratio central area in metal-sheet edges zone.The reason that the current path of fringe region is narrowed down is to flow through the electric current of fringe region towards edge offset, so may reduce along the induced current that flows in the thickness direction edge region of metallic plate and the inductance that is arranged between near the primary current of the induction coil the metal-sheet edges along the thickness direction of metallic plate of flowing through.Another the overheated reason that makes fringe region is (to be defined as d3/ (gait of march of metallic plate) heating time in the metal-sheet edges zone, wherein define among d3 such as Fig. 4 A) than longer in the heating time of central area (be defined as d1/ (gait of march of metallic plate), wherein define among d1 such as Fig. 4 A).
Lay respectively in the use of induction heating equipment of the diverse location on the metallic plate longitudinal direction in this upper induction coil and lower induction coil, if before the beginning induction heating, the temperature in metal-sheet edges zone is lower than the temperature of metallic plate central area, then can alleviate uneven Temperature Distribution behind the induction heating.Yet,, will obtain uneven Temperature Distribution on Width behind the induction heating if Temperature Distribution is uniformly or because last technology makes the temperature of fringe region be higher than the central area.
Summary of the invention
The objective of the invention is to solve the some or all of problems of above-mentioned conventional induction heating equipment.One embodiment of the invention are metal heating plate expeditiously, even the temperature of metallic plate is higher than Curie point, metallic plate is thin and/or metallic plate is made by the metal non magnetic, non-iron with low-resistivity such as aluminium or copper.In addition, one embodiment of the invention can provide the more uniform temperature on the metallic plate Width to distribute, and are irrelevant with the Temperature Distribution that is caused by last technology.One embodiment of the invention can more easily realize required Temperature Distribution, even with the change width of heated metal board, and do not need to prepare a plurality of induction coils to tackle change width.One embodiment of the invention can also improve because the uneven Temperature Distribution that metallic plate crawls and advances and cause.Another embodiment of the present invention provides the technology that has very big flexibility on a kind of width of distance, the induction coil between upper induction coil and lower induction coil and the amount of heat divergence.
Above-mentioned purpose of the present invention can realize by a kind of like this induction heating equipment that is used to heat the metallic plate of advancing, this equipment comprises: around the induction coil of metallic plate, described induction coil comprises top that is positioned at the metallic plate top and the lower part that is positioned at the metallic plate below, the described top of described induction coil and lower part are spaced-apart along the longitudinal direction of metallic plate in a position in a lateral direction of metallic plate at least, and the distance between the top of wherein said induction coil and the lower part on the longitudinal direction of metallic plate is in the variation in a lateral direction of metallic plate.
Above-mentioned purpose of the present invention also can realize by a kind of like this induction heating equipment that is used to heat the metallic plate of advancing, this equipment comprises: have the induction coil of top that is positioned at the metallic plate top and the lower part that is positioned at the metallic plate below, the described top of described induction coil and lower part are spaced-apart on the longitudinal direction of position at metallic plate in a lateral direction of metallic plate at least; AC power supplies, the top of described induction coil and each in the lower part are connected in this AC power supplies at the one end, and wherein the distance on the longitudinal direction at metallic plate between the described top of described induction coil and the lower part is in the variation in a lateral direction of metallic plate.
In the present invention, the metallic plate of advancing is not limited to the metallic plate of advancing along a direction, but comprises the reciprocating motion of metallic plate.
In the present invention, induction coil is a collective term, comprises the coil that is formed by the pipe of making around the electric conducting material of metallic plate single turn or multiturn, line, plate etc.In addition, be not limited to such as annular or square concrete form around metallic plate.For the material of electric conductor, low electrical resistant material is preferred such as copper, copper alloy or aluminium.
For metallic plate of the present invention, comprise magnetic material, such as the nonmagnetic substance of aluminium or copper with under the high temperature more than the Curie point, be in the steel of non magnetic state such as steel.
In the present invention, the horizontal direction of metallic plate refers to the direction perpendicular to the direct of travel of metallic plate.The longitudinal direction of metallic plate refers to the direct of travel of metallic plate.
In the present invention, the edge of metallic plate is the end of metallic plate in a lateral direction, the fringe region of metallic plate refer near or near the metallic plate the edge of metallic plate (top)/time (end) surface.
In the present invention, the width of induction coil refers to the width of induction coil on the longitudinal direction of metallic plate.
In the present invention, the induction coil above the metallic plate and along the longitudinal direction distance definition between the induction coil below the metallic plate be above induction coil and below two projected images of induction coil between distance, wherein these two projected images are formed by the upright projection of each induction coil on metallic plate respectively.
Fig. 5 is that induction heating equipment of the present invention edge is with the cross sectional representation on the longitudinal direction of heated metal board.The cross-sectional view of the metallic plate that Reference numeral 1 expression is extended along the longitudinal direction, Reference numeral 2a represents to be positioned at the cross-sectional view of the induction coil of metallic plate top, Reference numeral 2b represents to be positioned at the cross-sectional view of the induction coil of metallic plate below, Reference numeral 30a represents to be positioned at the upright projection image of the induction coil of metallic plate top, and Reference numeral 30b represents to be positioned at the upright projection image of the induction coil of metallic plate below.
Hereinafter, " be positioned at the induction coil of metallic plate top " and can be called " top of induction coil " or abbreviate " upper induction coil " as, " being positioned at the induction coil of metallic plate below " can be called " lower part of induction coil " or abbreviate " lower induction coil " as.
In a longitudinal direction distance definition is " L " among Fig. 5 between upper induction coil and lower induction coil.
Under the different situation of the width of the width of upper induction coil and lower induction coil, the starting point of determining described distance " L " is the edge (end) of the upright projection image of wideer induction coil.
From the detailed description that hereinafter provides, other ranges of application of the present invention will be obviously.Yet be to be understood that, detailed description and concrete example are though expression the preferred embodiments of the present invention only provide as an illustration, because for a person skilled in the art from this detailed description, various changes and modifications within the spirit and scope of the present invention all will be tangible.
Description of drawings
From the detailed description and the accompanying drawings given below, invention will be more fully understood, and wherein accompanying drawing only provides as graphic extension, is not limitation of the present invention therefore, wherein:
Fig. 1 is the schematic diagram according to the LF type induction heating equipment of background technology;
Fig. 2 shows the interior circular induced current that produces of metallic plate cross section among Fig. 1;
Fig. 3 is the schematic diagram according to the induction heating equipment of background technology;
Fig. 4 A shows the schematic diagram of the induced current flow state in the observed metallic plate in metallic plate top;
Fig. 4 B is the cross-sectional view that the line 4B-4B along Fig. 4 A makes;
Fig. 5 is the key diagram of distance between definition middle and upper part of the present invention induction coil and the lower induction coil;
Fig. 6 is the schematic diagram of the embodiment of the invention;
Fig. 7 is the cross sectional representation that the line 7-7 along Fig. 6 makes;
Fig. 8 is the schematic diagram of metallic plate induced currents flow regime from the observed Fig. 6 in metallic plate top;
Fig. 9 is the schematic diagram of the embodiment of the invention;
Figure 10 is the schematic diagram of the embodiment of the invention;
Figure 11 is the schematic diagram of the embodiment of the invention;
Figure 12 is the schematic diagram of the embodiment of the invention;
Figure 13 is the schematic diagram of the embodiment of the invention;
Figure 14 is the schematic diagram of the embodiment of the invention;
Figure 15 is the schematic diagram of the embodiment of the invention;
Figure 16 is the schematic diagram of the embodiment of the invention;
Figure 17 is the schematic diagram of the embodiment of the invention;
Figure 18 is the schematic diagram of the embodiment of the invention;
Figure 19 is the schematic diagram of the embodiment of the invention;
Figure 20 is the cross sectional representation of Figure 19;
Figure 21 is the schematic diagram of the embodiment of the invention;
Figure 22 is the cross sectional representation that the line 22-22 along Figure 21 makes;
Figure 23 is the cross sectional representation that the line 23-23 along Figure 21 makes;
Figure 24 is the schematic diagram of the embodiment of the invention;
Figure 25 is the cross sectional representation that the line 25-25 along Figure 24 makes;
Figure 26 is the cross sectional representation that the line 26-26 along Figure 24 makes;
Figure 27 is the schematic diagram of the embodiment of the invention; And
Figure 28 is the schematic diagram of the embodiment of the invention.
Embodiment
Now with reference to accompanying drawing the present invention is described.Institute's drawings attached shows the single-turn induction coil around metallic plate.Yet the number of turn of induction coil is not limited to concrete number in the present invention.
Fig. 6 is the floor map of an example of induction heating equipment of the present invention.Fig. 7 is the cross sectional representation that the line 7-7 along Fig. 6 makes.In the present invention, another induction coil that is positioned at the induction coil of metallic plate top and is positioned at the metallic plate below is set to spaced-apart along the longitudinal direction of metallic plate in a position in a lateral direction of metallic plate at least.Be the distance between two projected images of upper induction coil and lower induction coil at spaced-apart along the longitudinal direction upper induction coil and the distance definition between the lower induction coil, these two projected images are respectively to form by each induction coil upright projection on metallic plate.Distance between upper induction coil and the lower induction coil can change at horizontal diverse location place on the part of longitudinal direction at least.In Fig. 6, upper induction coil 2a and lower induction coil 2b have specific bent shapes, thereby the edge region ratio is little in the central area in a lateral direction for the distance between upper induction coil and the lower induction coil.Reference numeral 7 expression conductive components, 8 expression AC power supplies, the induction coil that 9 expressions are provided with near metal-sheet edges (end).In addition, symbol x represents the width of horizontal direction on the longitudinal direction of induction coil at metallic plate of central area along metallic plate.Symbol L is illustrated in the upper induction coil of central area and the distance between the lower induction coil.
When upper induction coil and lower induction coil when the longitudinal direction of metallic plate is provided with spaced-apartly, especially in central area as shown in Figure 6, the upper path of the circular induced current that produces in metallic plate and lower path also distribute on the longitudinal direction of metallic plate spaced-apartly.So when faradic penetration depth is big, even the temperature height of metallic plate and/or metallic plate be when thin, can be under the situation that the induced current in top that does not have metallic plate and the lower part is offset metal heating plate expeditiously.
Ultimate range between upper induction coil and lower induction coil (in Fig. 6, corresponding to the distance L of central area) can be determined according to the material of metallic plate, the temperature of metallic plate, the width of induction coil and the width of metallic plate.For heating-up temperature effectively more than the Curie point in non-magnetic region through cold rolling steel plate, consider the width of metallic plate, the width of induction coil and the gait of march of metallic plate, preferably distance L is made as 0.2 to 6 times of width of induction coil, especially preferably this distance is made as 0.6 to 4 times of width of induction coil.Offset if the top and the induced current in the lower part of metallic plate, appear less than 0.2 times of width of induction coil in distance so, this can not heat effectively.If described distance greater than 6 times of width of induction coil, is difficult to reduce the current density and increase heating time in metal-sheet edges zone so, this causes the temperature of fringe region to increase.In addition, reactance also becomes greatly, and this needs high voltage source, and is difficult to implement on commercial scale.Hereinafter, when the width of the width of upper induction coil and lower induction coil not simultaneously, unless otherwise defined, the width of the induction coil of width (along the longitudinal direction of metallic plate) expression broad.
When be provided with in metallic plate central area in a lateral direction suitable apart from the time, the central area of metallic plate can be heated effectively.Yet if at the fringe region of metallic plate same distance is set, as previously mentioned, the fringe region of metallic plate is overheated, in the uneven Temperature Distribution of formation in a lateral direction of metallic plate.
In the example depicted in fig. 6, in the distance in metal-sheet edges zone less than distance in the central area, thereby can suppress the overheated of fringe region effectively.Overheated being inhibited of fringe region is because less distance makes the top of metallic plate and the induced current of lower part offset significantly, weakened the heating of fringe region.In addition, shorten heating time, and this also causes reducing thermal transpiration, because the quadratic sum of the thermal transpiration of induction heating equipment and current density is proportional heating time.
In Fig. 6, upper induction coil and lower induction coil have the specific curvature part, state induction coil in this sweep place and stride across the metallic plate extension obliquely with respect to horizontal direction.This inclination also is to avoid one of overheated reason of metallic plate edge region.
Fig. 8 shows the schematic diagram of induced current flow state from the metallic plate of the observed Fig. 6 in metallic plate top.The induced current 10 of metallic plate upside and downside along with flow through the opposite direction of the primary current of induction coil, the wherein faradic width almost width with the projected image of induction coil is identical.
The inductance between induced current and the primary current at the induction coil of metal-sheet edges of flowing through is tending towards along the flow path of more close metallic plate central area through near the induced current the metal-sheet edges, so can reduce.In other words, attempt to be connected to each other by the top induced current of upper induction coil induction with by the bottom induced current of lower induction coil induction along the shortest path.Near the edge of metallic plate, provide the induced current flow passage of broad like this, thereby near the current density that suppresses the edge increases.Therefore, when upper induction coil and lower induction coil have edge region with respect to the part of horizontal direction diagonally extending,, can suppress the overheated of fringe region effectively with respect to the induction coil that does not have this sloping portion.
When the distance between maintenance upper induction coil and lower induction coil made that the metallic plate central area is heated efficiently, the less relatively distance of induction coil had suppressed the overheated of fringe region with being in tilted layout in the metal-sheet edges zone.As a result, in the example of Fig. 6, even heating has in a lateral direction appearred.
Diverse location place upper induction coil in a lateral direction and the optimum distance between the lower induction coil should be determined after consideration will be heated the existing Temperature Distribution of metallic plate.In metallic plate, have three kinds of different representational existing Temperature Distribution, for example, metallic plate has smooth Temperature Distribution (identical with the fringe region temperature in the central area), metallic plate has edge region Temperature Distribution or the metallic plate low slightly with respect to the central area temperature and has the edge region Temperature Distribution high slightly with respect to the central area temperature.
In the present invention, be positioned at the top of induction coil of metallic plate top and the lower part that is positioned at the induction coil below the metallic plate and be set to lay respectively at along the different position of the longitudinal direction of metallic plate in a position in a lateral direction of metallic plate at least, the distance between the wherein said diverse location changes in a lateral direction.The shape of induction coil is not limited to shown in Figure 6 the sort of.For example, shape shown in Figure 9, wherein place along opposite direction the shape top, a pair of sharp turn of induction coil and lower part, or the shape shown in Figure 10, wherein place along opposite direction a pair of arc top of induction coil and lower part, can be as the shape of induction coil.Also can use the shape of various other shapes as induction coil.For example, can use shape shown in Figure 11, wherein, only upper induction coil is a hat, and lower induction coil is straight.In addition, can use shape shown in Figure 12, wherein a pair of dogleg shapes is placed along opposite direction, but this shape longitudinal centre line symmetry of metallic plate relatively not.In Figure 12, Reference numeral 2a represents to be positioned at the upper induction coil of metallic plate 1 top, Reference numeral 2b represents to be positioned at the lower induction coil of metallic plate 1 below, and Reference numeral 7,8 and 9 is represented conductive component, AC power supplies respectively and is positioned near the induction coil of metal-sheet edges.
In the example depicted in fig. 13, the distance of central area is less, and upper induction coil has the width that narrows down and the sloping portion of edge region in the central area.Reference numeral 7,8 and 9 is represented conductive component, AC power supplies respectively and is positioned near the induction coil of metal-sheet edges.The quadratic sum of the thermal transpiration of known induction heating equipment and current density is proportional heating time.In the example of Figure 13, the current density of central area is higher than the current density of fringe region, because in the narrowed width of central area induction coil, causes the thermal transpiration of central area to increase with respect to the thermal transpiration of fringe region.
When the metallic plate of sending into induction heating equipment has existing Temperature Distribution, wherein the temperature of a little higher than central area of temperature of fringe region (temperature of central area is lower than the temperature of fringe region slightly) has the metallic plate that more uniform temperature distributes after the equipment of Figure 13 can be preferred for obtaining to heat.
In the example depicted in fig. 14, as in the example of Fig. 6, upper induction coil 2a and lower induction coil 2b edge region are arranged obliquely, thereby the distance value between the two diminishes towards the edge of metallic plate.
Figure 15 shows a kind of equipment, and wherein with regard to the projected image of two coils, upper induction coil and lower induction coil edge region intersect.In this example, being desirably in the central area has bigger thermal transpiration, and edge region has less thermal transpiration.This orientation is applicable to the metallic plate that the temperature of heated center region is lower with respect to fringe region.
Figure 16 shows a kind of equipment, upper induction coil 2a and the lower induction coil 2b sweep that has edge region respectively wherein, wherein each induction coil of edge region all strides across the metallic plate extension obliquely with respect to horizontal direction, and the width of induction coil is greater than the width in the central area.Reference numeral 7,8 and 9 is represented conductive component, AC power supplies respectively and is positioned near the induction coil of metal-sheet edges.In this example, the current density of metallic plate central area is higher than the current density of the metallic plate central area among Fig. 6.Therefore, the thermal transpiration of central area is greater than the thermal transpiration of the central area among Fig. 6, because the quadratic sum of thermal transpiration and current density is proportional heating time.
Figure 17 shows a kind of equipment, upper induction coil 2a and the lower induction coil 2b sweep that has edge region respectively wherein, wherein each induction coil of edge region all strides across the metallic plate extension obliquely with respect to horizontal direction, and the inclination angle of upper induction coil and lower induction coil is different, thereby the distance between two induction coils can reduce gradually from the central area to fringe region and edge.
In Figure 17, metallic plate is wide more, and the thermal transpiration of fringe region is more little.When the width of metallic plate increased, as increasing to II-II ' from width I-I ' in Figure 17, or the temperature difference of metal { (temperature in metal-sheet edges zone)-(temperature of metallic plate central area) } was when increasing, and this example is suitable.
Figure 18 shows a kind of equipment, upper induction coil 2a and the lower induction coil 2b sweep that has edge region respectively wherein, wherein each induction coil of edge region all strides across the metallic plate extension obliquely with respect to horizontal direction, and the inclination angle of upper induction coil and lower induction coil is different, thereby the distance between two induction coils can increase gradually from the central area to fringe region and edge.In Figure 18, metallic plate is wide more, and the thermal transpiration of fringe region is big more.When the width of metallic plate increased, as increasing to II-II ' from width I-I ' in Figure 18, or the temperature in metal-sheet edges zone was with respect to the temperature step-down of central area, and this example is suitable.After using this equipment heating, can expect that obtaining more uniform temperature distributes.
In the actual motion of firing equipment of the present invention, in order to obtain necessary thermal transpiration, can determine the width of described distance and/or induction coil in advance to each position in a lateral direction by electromagnetic field analysis.Yet because the fluctuation in last technology, the metallic plate of sending in the induction heating equipment of the present invention may have initial variations in temperature.So,, also may can not get necessary thermal transpiration even adopted the predetermined distance and/or the width of induction coil.
If the distance between upper induction coil and the lower induction coil increases, then help avoid the counteracting of metallic plate induced currents and increased heating time, this causes thermal transpiration to increase.In another embodiment of the present invention, its middle distance is adjustable, for the variations in temperature of the metal of sending into, can obtain required temperature by regulating this distance, and irrelevant with the existing state of temperature that is caused by last technology.
Figure 19 shows upper induction coil 2a and the lower induction coil 2b that is slidably mounted on the pair of guide rails 11 that is fixed on the pair of base 12, and wherein pedestal 12 extends on the longitudinal direction of metallic plate.Figure 20 shows the cross-sectional view of Figure 19.Induction coil (not shown in Figure 19) by known methods moves, such as the cylinder of cylinder, hydraulic cylinder or motor driven.Though Figure 19 shows upper induction coil and lower induction coil is all movably installed, only one of upper induction coil and lower induction coil be movable also be acceptable.Pedestal 12 and/or guide rail 11 can be made from insulation materials such as ceramics and, because they place near the high-intensity magnetic field of induction coil.When using metal in some applications, need to use nonmagnetic substance such as stainless steel, brass or aluminium.Pedestal and guide rail should be as far as possible away from induction coils.In addition, in order to prevent the induced current heating, pedestal and guide rail should be water-cooleds.Upper induction coil 2a and lower induction coil 2b are connected in water-cooled connector 9 via movable conductive component 13 as water-cooled cable.The splicing ear of Reference numeral 18 expression copper coins.
Other example is the same with some, upper induction coil 2a among Figure 19 is parallel with horizontal direction in the central area with lower induction coil 2b, and the sweep that has edge region respectively, wherein each induction coil of edge region all strides across the metallic plate extension obliquely with respect to horizontal direction.Therefore, described distance can change at diverse location place in a lateral direction.
Control thermal transpiration by the distance value that changes between upper induction coil and the lower induction coil as mentioned above.So for example, distance value can be according to the temperature change of the metallic plate of the thermometer measure that is positioned at the induction heating equipment upstream.
In order to obtain in a lateral direction the thermal transpiration that each position needs, can determine the width of described distance and/or induction coil in advance to each position in a lateral direction by electromagnetic field analysis.Yet,, may not obtain to have the metallic plate of uniform temperature distribution, even above-mentioned preset distance value is adopted in induction coil each position in a lateral direction when the width of metallic plate changes when changing according to manufacture.
Figure 21 shows and is used to make another embodiment of the distance variable of each position in a lateral direction, and this embodiment can obtain even temperature and distribute, even during the change width of the metallic plate of carrying.
In Figure 21, upper induction coil comprise a plurality of edge area conductors a-a ' to i-i ' and j-j ' to r-r ', each edge area conductors mutual insulating and independence.Edge area conductors a-a ' each in to i-i ' and j-j ' to r-r ' is linked optionally with central area bonding conductor 9b.This selectable connection can utilize known contactor controller (not shown in Figure 21) to finish such as the cylinder of electromagnetic contactor, cylinder or motor driven.
Lower induction coil comprise a plurality of edge area conductors A-A ' to I-I ' and J-J ' to R-R ', each edge area conductors mutual insulating and independence.Edge area conductors A-A ' each in to I-I ' and J-J ' to R-R ' is linked optionally with central area bonding conductor 9f.
The same with other example, in the embodiment of Figure 21, with regard to the projected image of two coils, a distance is arranged on the longitudinal direction at metallic plate between upper induction coil and the lower induction coil.Distance between upper induction coil and lower induction coil can be different in a lateral direction the position change.Upper induction coil and lower induction coil design like this, promptly can be greater than the distance in the metal-sheet edges zone in the described distance of metallic plate central area.Two coils have the sweep of edge region respectively, and wherein each induction coil of edge region strides across the metallic plate extension obliquely with respect to horizontal direction.
Figure 22 is the cross-sectional view that the line 22-22 along Figure 21 makes.Figure 23 is the cross-sectional view that the line 23-23 along Figure 21 makes.
In the embodiment shown in Figure 21, the electric current that flows out from the conductive component 7 that is connected in AC power supplies 8 is through the loop of induction coil as follows.Pass through bonding conductor 9a, conductor g-g ' and h-h ', central area bonding conductor 9b, conductor k-k ' and I-I ', bonding conductor 9c, bonding conductor 9d, bonding conductor 9e, (entering the lower induction coil zone) successively from the electric current of electric conductor 7, through conductor K-K ' and L-L ', center bonding conductor 9f, conductor G-G ' and H-H ', bonding conductor 9g, conductive component 7, get back to AC power supplies then.Conductor and bonding conductor should be made by the excellent conductive material such as copper.
Figure 24 is a plane graph of handling the induction heating equipment of broad metallic plate.
Figure 25 is the cross-sectional view that the line 25-25 along Figure 24 makes.
Figure 26 is the cross-sectional view that the line 26-26 along Figure 24 makes.
Compare with situation shown in Figure 21, electrical conductor changes to a-a ' and b-b ' from g-g ' and h-h ', changes to q-q ' and r-r ' (for upper induction coil) from k-k ' and l-l '; Change to Q-Q ' and R-R ' from K-K ' and L-L ', and change to A-A ' and B-B ' (for lower induction coil) from G-G ' and H-H '.Changing the known contactor controller that can utilize such as the cylinder of electromagnetic contactor, cylinder and motor driven of selecting to connect be energized conductor finishes.
Therefore, even the heated metal board width is from the narrower broad (changing to situation shown in Figure 24 from situation shown in Figure 21) that changes to, by the suitable conductor of selecting according to the width of new metallic plate to be energized, described distance still can keep with identical in the past with fringe region in the central area.Can eliminate like this because metallic plate temperature and the Temperature Distribution problem that cause of change width after heating.
Induction heating equipment of the present invention can use separately, such as before preheating indirect heating type stove/afterwards technology in, or with the technology of LF (longitudinal flux flux) the type firing equipment series combination of routine in, thereby avoid interference between the induction coil.Induction heating equipment of the present invention is metal heating plate expeditiously, even under the temperature more than the Curie point in the zone of bigger induced current depth of penetration, because upper induction coil and lower induction coil are spaced-apart once distance (projected image of two coils, the distance between upper induction coil and the lower induction coil) along the longitudinal direction of metallic plate.Consider foregoing, induction heating equipment of the present invention can more preferably be used for the metallic plate of temperature more than Curie point, and indirect heater can be used for the metallic plate of temperature far below Curie point cheaply.
Heat run of the present invention is utilized non magnetic SUS304 steel plate, and (thickness: 0.2mm, width: the metallic plate of 600mm) making carries out.Test is described with reference to Figure 27 A and 27B.The AC power supplies (not shown) is 25KHz, and the capacitor with capacity of 100KW is conditioned to mate with the induction coil that uses.The induction coil that uses is single turn (around a heated steel plate) induction coil.Water-cooled copper plate is 5mm by thickness, and width is that the copper coin of 100mm (different with the width that the present invention limits) constitutes.Water-cooled copper (external diameter: 10mm, internal diameter: 8mm) be connected in copper coin in a side (outside) relative with steel plate by soldering.In this example, " induction coil " comprises copper coin and water-cooled copper, the copper pipe because electric current is also flowed through.Gap between heated steel plate and induction coil is 50mm.The upper induction coil above the steel plate and the distance on the longitudinal direction at steel plate between the lower induction coil below the steel plate in a lateral direction the central area of steel plate be 200mm (that is, ultimate range is 200mm).
The distance that can regulate the steel plate fringe region by the induction coil inclination angle that changes fringe region.More specifically, shown in Figure 27 A-Figure 27 D, induction coil is made of left part, right side part and the copper coin that is connected that is connected a left side and right half in the centre.Induction coil is on connection copper coin adjustable angle saves land the synthetic resin board (bakelite plate) that is fixed on the induction coil supporting base.Precalculated position angulation adjustment hole on water-cooled copper plate (induction coil) is so that utilize the connection copper coin that a left side and right half are fixed together.
Figure 27 A shows example A of the present invention, and wherein two induction coils are with the angle settings that become 5 degree with respect to the sideline of bakelite plate (is 5 degree at induction coil and the angle (inclination angle) that is heated between the horizontal direction of steel plate).Figure 27 B shows example B of the present invention, and wherein two induction coils are with the angle settings that become 10 degree with respect to the sideline of bakelite plate (is 10 degree at induction coil and the angle (inclination angle) that is heated between the horizontal direction of steel plate).Figure 27 C shows example C of the present invention, and wherein two induction coils are with the angle settings that become 15 degree with respect to the sideline of bakelite plate (is 15 degree at induction coil and the angle (inclination angle) that is heated between the horizontal direction of steel plate).Figure 27 D shows example D of the present invention, and wherein two induction coils are with the angle settings that become 20 degree with respect to the sideline of bakelite plate (is 20 degree at induction coil and the angle (inclination angle) that is heated between the horizontal direction of steel plate).In the superincumbent all situations, the gait of march of steel plate is 2m/min.
The sensed firing equipment heating of steel plate, while is the variable in distance of fringe region as mentioned above, and the outlet at induction heating equipment utilizes the steel billet temperature of two-dimensional infrared thermometer measure at central area and fringe region (from the position of edges of plate 50mm), thereby calculates the value of { (temperature of fringe region)-(temperature of central area) }.The result is shown in the following table 1.
Table 1
| Angle between induction coil and steel plate transverse direction (inclination angle) | (temperature of fringe region)-(temperature of central area) | |
| Figure 27 |
5 degree | 220℃ |
| Figure 27 |
10 degree | 30℃ |
| Figure 27 C | 15 |
2℃ |
| Figure 27 |
20 degree | -40℃ |
Can find that from top result the temperature of edge region and central area can change (Temperature Distribution can change) by upper induction coil and the distance between the lower induction coil that changes edge region.In Figure 27 C, the angle between induction coil and steel plate transverse direction is 15 degree, in the temperature of central area and fringe region (even temperature distribution) much at one.
In Figure 27 D, the angle between induction coil and steel plate transverse direction is 20 degree, and the heating of fringe region weakens.The use of this situation is suitable for handling the metallic plate with the existing Temperature Distribution that is caused by last technology, and wherein the temperature of edge region is higher than the temperature of central area.
Heat run of the present invention is also utilized cold-rolled steel sheet (thickness: 0.6mm, width: 600mm) carry out.The AC power supplies (not shown) is 50KHz, and the capacitor with 200KW capacity is regulated, to mate with the induction coil that uses.The gait of march of steel plate is 2m/min.
Use induction coil shown in Figure 28 to test, wherein not shown AC power supplies and with being connected of power supply.In Figure 28, upper induction coil comprises a plurality of induction coil conductors A-J, each conductor is by mutual insulating and water-cooled copper plate (width: 50mm independently, thickness: 10mm) make, and place (being called " the induction coil conductors A-J of inclination ") obliquely with respect to the horizontal direction that is heated steel plate.Similarly, lower induction coil comprises a plurality of induction coil conductors K-T.Each induction coil conductors A-J of upper induction coil can (selectively) be connected in induction coil conductors U, V, W, X, Y, Z, A ', B ', C ', among induction coil conductors U, V, W, X, Y, Z, A ', B ', the C ' each is also by water-cooled copper plate (width: 50mm, thickness: 10mm) make, and place (be called " the induction coil conductors U-C that is parallel to horizontal direction) abreast with respect to the horizontal direction that is heated steel plate.The induction coil conductors U-C ' that is parallel to horizontal direction is with respect to the more close heated steel plate setting of conductor (promptly being positioned at the below of the induction coil conductors A-J of inclination) of tilting, and the electrical connection between any of any and the conductor A-J of conductor U-C ' is to insert between by the conductor in selected combination to connect copper coin and finish.That is, connect the choice of location of copper coin insertion with the conductor that is energized.Bakelite plate is inserted between other unselected conductors, and utilizes insulated bolt to fix.With the same manner, each induction coil conductors K-T of lower induction coil can (selectively) be connected in induction coil conductors D ', E ', F ', G ', H ', I ', J ', K ', L ', among induction coil conductors D ', E ', F ', G ', H ', I ', J ', K ', the L ' each is also by water-cooled copper plate (width: 50mm, thickness: 10mm) make, and place abreast with respect to the horizontal direction that is heated steel plate.
Outlet at induction coil utilizes the temperature of infrared thermometer measurement at central area and fringe region (from the position of edges of plate 50mm) steel plate.
The result is shown in the table 2, poor between the temperature of the combination of the induction coil conductors that wherein is allowed a choice and the temperature of edge region and central area, i.e. (temperature of fringe region)-(temperature of central area).Upper induction coil and lower induction coil are spaced-apart on the longitudinal direction of metallic plate.So, can carry out heating at the non-magnetic region of 750 ℃ or higher temperature.
Table 2
| The tilt induction coil-conductor of selecting | The induction coil conductors of selecting that is parallel to horizontal direction | (temperature of fringe region)-(temperature of central area) | |||
| Upper induction coil | Lower induction coil | Upper induction coil | Lower induction coil | ||
| Example F | DEFJ | NOPQ | VWXYA’B’ | J’K’E’F’H’I’ | 4℃ |
| Example G | CDGH | MNQR | VWXYA’B’ | J’K’E’F’H’I’ | 18℃ |
| Example H | ABIJ | KLST | VWXYA’B’ | J’K’E’F’H’I’ | 75℃ |
| Example I | CDEFGH | MNOPQR | VWXYA’B’ | J’K’E’F’H’I’ | 6℃ |
| Example J | CDEFGH | MNOPQR | UVWXYZA’B’C’ | D’E’F’G’H’I’J’K’L’ | 10℃ |
| Example K | CH | MR | UVWXYZA’B’C’ | D’E’F’G’H’I’J’K’L’ | 50℃ |
| Example L | EF | OP | XWA’ | F’J’I’ | -6℃ |
In example F, for upper induction coil and lower induction coil, select two to be parallel to the induction coil conductors of horizontal direction and the induction coil conductors of two inclinations, wherein inclination conductor in upper and lower is in the position intersection (with regard to projected image) of steel plate width inboard.In example G, be similar to example F, select two to be parallel to the induction coil conductors of horizontal direction and the induction coil conductors of two inclinations.Yet inclination conductor in upper and lower is in steel plate edge (nearby) part intersection (with regard to projected image).In example H, be similar to example F and G, select two to be parallel to the induction coil conductors of horizontal direction and the induction coil conductors of two inclinations.Yet the conductor that the upper and lower tilts is in steel plate edge outside intersection (with regard to projected image).At example F, among G and the H, select conductor like this, promptly the distance between the coil of steel plate fringe region upper and lower becomes big successively from F to H.
Be appreciated that from the data " (temperature of fringe region)-(temperature of central area) " of table 2 in a lateral direction Temperature Distribution is more even in than example H (inclination conductor in upper and lower intersects in the outside, steel plate edge) the example F (inclination conductor in upper and lower intersects in the position of steel plate width inboard).
In example I, for upper induction coil and lower induction coil, select two and be parallel to the induction coil conductors of horizontal direction and the induction coil conductors of three inclinations.In example J, for upper induction coil and lower induction coil, select three and be parallel to the induction coil conductors of horizontal direction and the induction coil conductors of three inclinations.Because the current density ratio in example I in the central area is higher in example J, so bigger in example J at thermal transpiration ratio in example I of central area.As a result, " (temperature of fringe region)-(temperature of central area) " ratio in example I is littler in example J.Yet the temperature of edge region is still overheated slightly.
In example K, for upper induction coil and lower induction coil, select three and be parallel to the induction coil conductors of horizontal direction and the induction coil conductors of two inclinations.In example L, for upper induction coil and lower induction coil, select one and be parallel to the induction coil conductors of horizontal direction and the induction coil conductors of two inclinations.Because it is the current density ratio in example L in the central area is higher in example K, bigger in example K at thermal transpiration ratio in example L of central area.As a result, " (temperature of fringe region)-(temperature of central area) " ratio in example L is littler in example K.Yet the temperature of edge region is still overheated slightly.
As mentioned above, by selecting conductor and number thereof can realize different Temperature Distribution.
Embodiment 3
In Figure 17 or Figure 18 induction heating equipment has been shown, upper induction coil and lower induction coil all have on the longitudinal direction of metallic plate the same side with respect to the sloping portion of the x wire of metallic plate, and almost parallel mutually.This induction heating equipment is used to heat the metallic plate with different in width.Except the angular direction of the sloping portion of induction coil, use with the foregoing description 1 in identical induction coil and AC power supplies.The metallic plate that uses is the SUS304 steel plate, has thickness and the width of 800mm and the width of 600mm of 0.4mm.The gait of march of steel plate is 2m/min.Gap between steel plate and induction coil is 50mm.
In example M and N, distance between upper induction coil and lower induction coil is made as 200mm in the central area, the distance of edge region is 170mm in example M (corresponding to Figure 17) when using the steel plate of 800mm, is 250mm in example N (corresponding to Figure 18).In position measurement fringe region temperature away from steel plate edge 50mm.The result is shown in the table 3.
Table 3
| The displacement of central area [mm] | The displacement of fringe region [mm] | { (temperature of fringe region)-(temperature of central area) } of the steel plate of width 800mm | { (temperature of fringe region)-(temperature of central area) } of the steel plate of width | |
| Example M | ||||
| 200 | 170 | -5℃ | -2 | |
| Example N | ||||
| 200 | 250 | 32℃ | 21℃ |
In example M, because the distance of fringe region is less than the central area, the temperature of fringe region can reduce with respect to the temperature of central area usually.Under the situation of the wide steel plate of 600mm, bigger under the situation of the steel plate that the distance of edge region (measurement point is from edges of plate 50mm) is wideer than 800mm, this causes the relative increase of longer heating time and fringe region temperature.On the contrary, in example N, the distance of edge region is bigger than the central area, and thermal transpiration also becomes greatly, and this causes edge region higher with respect to the central area temperature.
As mentioned above, the present invention is metal heating plate expeditiously, even the temperature of metallic plate is higher than Curie point, metallic plate is thin and/or metallic plate is made by the metal non magnetic, non-iron with low-resistivity such as aluminium or copper.And the present invention can also be provided at the metallic plate of Temperature Distribution more smooth on the Width, and distributes irrelevant with any already present initial temperature that last technology provides.The present invention can more easily control amount of heat divergence and/or realize required Temperature Distribution according to the initial temperature condition of heated metal board, even the heated metal board change width.
Although the present invention is described, the variation of multiple mode can be arranged obviously.These variants are not thought the disengaging the spirit and scope of the present invention, and it will be apparent to those skilled in the art that all improve and all think and comprise within the scope of the appended claims.
Claims (20)
1. induction heating equipment that is used to heat the metallic plate of advancing comprises:
Be used for induction coil around metallic plate, described induction coil comprises top that is positioned at the metallic plate top and the lower part that is positioned at the metallic plate below, and the described top of described induction coil and lower part are spaced-apart along the longitudinal direction of metallic plate in a position in a lateral direction of metallic plate at least;
Wherein, the distance on the longitudinal direction at metallic plate between the top of described induction coil and the lower part is in the variation in a lateral direction of metallic plate.
2. induction heating equipment as claimed in claim 1, it is characterized in that, be 0.2 to 6 times of width of wideer part in the top of described induction coil and the lower part in the ultimate range on the longitudinal direction at metallic plate between the top of described induction coil and the lower part.
3. induction heating equipment as claimed in claim 2 is characterized in that, in a position in a lateral direction of metallic plate, the distance between the top of described induction coil and the lower part on the longitudinal direction of metallic plate can change at least.
4. induction heating equipment as claimed in claim 3 is characterized in that, the top of described induction coil and at least one in the lower part are movably on the longitudinal direction of metallic plate.
5. induction heating equipment as claimed in claim 4 is characterized in that, also is included in the guide rail of the longitudinal direction upper edge metallic plate extension of metallic plate, and the top of described induction coil and at least one in the lower part are installed on the described guide rail movably.
6. induction heating equipment as claimed in claim 3, it is characterized in that, the top of described induction coil and at least one in the lower part comprise the part that is made of a plurality of conductors, and the described distance that is on the longitudinal direction of metallic plate at least one position in a lateral direction of metallic plate can be changed as the conductor with indirect current by selecting the particular conductor in described a plurality of conductor.
7. induction heating equipment as claimed in claim 2 is characterized in that, width the changing in a lateral direction at metallic plate of the top of described induction coil and at least one in the lower part.
8. induction heating equipment as claimed in claim 1, it is characterized in that at least one in the top of described induction coil and the lower part is included in the second portion that the first of extending in a lateral direction of metallic plate and horizontal direction with respect to metallic plate become the inclination angle to extend.
9. induction heating equipment as claimed in claim 8, it is characterized in that, the top of described induction coil and lower part all comprise described first and second portion, and the direction that the second portion of the top of described induction coil and each in the lower part is opposite in the longitudinal direction upper edge of metallic plate is extended.
10. induction heating equipment as claimed in claim 1 is characterized in that, described induction coil also comprises the top that is connected described induction coil and the marginal portion between the lower part, and described marginal portion is positioned at the edge of metallic plate.
11. an induction heating equipment that is used to heat the metallic plate of advancing comprises:
Have the induction coil of top that is positioned at the metallic plate top and the lower part that is positioned at the metallic plate below, the described top of described induction coil and lower part are spaced-apart on the longitudinal direction of position at metallic plate in a lateral direction of metallic plate at least;
AC power supplies, the top of described induction coil and each in the lower part are connected in described AC power supplies at the one end;
Wherein, the distance on the longitudinal direction at metallic plate between the described top of described induction coil and the lower part is in the variation in a lateral direction of metallic plate.
12. induction heating equipment as claimed in claim 11, it is characterized in that, be 0.2 to 6 times of width of wideer part in the top of described induction coil and the lower part in the ultimate range on the longitudinal direction at metallic plate between the top of described induction coil and the lower part.
13. induction heating equipment as claimed in claim 12 is characterized in that, at least in a position in a lateral direction of metallic plate, the distance on the longitudinal direction at metallic plate between the top of described induction coil and the lower part can change.
14. induction heating equipment as claimed in claim 13 is characterized in that, the top of described induction coil and at least one in the lower part are movable on the longitudinal direction of metallic plate.
15. induction heating equipment as claimed in claim 14 is characterized in that, also is included in the guide rail of the longitudinal direction upper edge metallic plate extension of metallic plate, the top of described induction coil and at least one in the lower part are installed on the described guide rail movably.
16. induction heating equipment as claimed in claim 13, it is characterized in that, the top of described induction coil and at least one in the lower part comprise the part that is made of a plurality of conductors, and the described distance that is on the longitudinal direction of metallic plate at least one position in a lateral direction of metallic plate can be changed as the conductor with indirect current by selecting the particular conductor in described a plurality of conductor.
17. induction heating equipment as claimed in claim 12 is characterized in that, width the changing in a lateral direction at metallic plate of the top of described induction coil and at least one in the lower part.
18. induction heating equipment as claimed in claim 11, it is characterized in that at least one in the top of described induction coil and the lower part is included in the second portion that the first of extending in a lateral direction of metallic plate and horizontal direction with respect to metallic plate become the inclination angle to extend.
19. induction heating equipment as claimed in claim 18, it is characterized in that, the top of described induction coil and lower part all comprise described first and second portion, and the direction that the second portion of the top of described induction coil and each in the lower part is opposite in the longitudinal direction upper edge of metallic plate is extended.
20. induction heating equipment as claimed in claim 11, it is characterized in that, described induction coil also comprises the marginal portion, described marginal portion is connected between the described top and lower part of described induction coil on the described top of described induction coil and the end relative with AC power supplies of lower part, and described marginal portion is positioned at the edge of metallic plate.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP041944/2005 | 2005-02-18 | ||
| JP2005041944 | 2005-02-18 | ||
| JP2005256334 | 2005-09-05 | ||
| JP256334/2005 | 2005-09-05 | ||
| PCT/JP2006/302676 WO2006088068A1 (en) | 2005-02-18 | 2006-02-09 | Induction heating device for a metal plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101120616A true CN101120616A (en) | 2008-02-06 |
| CN101120616B CN101120616B (en) | 2011-06-08 |
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Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006800049238A Expired - Fee Related CN101120617B (en) | 2005-02-18 | 2006-02-09 | Induction heating device for metal plate |
| CN2006800048926A Expired - Fee Related CN101120616B (en) | 2005-02-18 | 2006-02-09 | Induction heating device for metal plate |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006800049238A Expired - Fee Related CN101120617B (en) | 2005-02-18 | 2006-02-09 | Induction heating device for metal plate |
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| Country | Link |
|---|---|
| CN (2) | CN101120617B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103649346A (en) * | 2011-07-28 | 2014-03-19 | 杰富意钢铁株式会社 | Method for heating steel plate, and heating apparatus |
| CN104717771A (en) * | 2013-12-17 | 2015-06-17 | 北京交通大学 | Induction heating device for steel wire rope core belt |
| CN109971928A (en) * | 2019-04-16 | 2019-07-05 | 北京科技大学 | A kind of slab induction heating apparatus |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2789927C (en) * | 2010-02-19 | 2015-02-10 | Nippon Steel Corporation | Transverse flux induction heating device |
| CN102884862B (en) | 2010-02-19 | 2014-11-19 | 新日铁住金株式会社 | Transverse flux induction heating device |
| JP6323564B2 (en) * | 2014-09-05 | 2018-05-16 | 新日鐵住金株式会社 | Induction heating device for metal strip |
| CN106323010A (en) * | 2016-11-15 | 2017-01-11 | 天津林立感应加热电炉制造有限公司 | Large-diameter liftable induction heating furnace ring |
| CN107570858A (en) * | 2017-09-29 | 2018-01-12 | 宁波三申材料科技有限公司 | Electrokinetic cell lug high-frequency welding rubberizing coil and tab welding device, method |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2448009A (en) * | 1944-02-05 | 1948-08-31 | Westinghouse Electric Corp | Inductive heating of longitudinally moving metal strip |
| BE565971A (en) * | 1957-03-23 | |||
| US3031555A (en) * | 1959-07-15 | 1962-04-24 | Magnethermic Corp | Induction heating |
| DE1149836B (en) * | 1962-09-14 | 1963-06-06 | Deutsche Edelstahlwerke Ag | Process for inductive heating of gap pieces |
| DE1803129A1 (en) * | 1968-10-15 | 1970-04-23 | Siemens Ag | Induction heater for flat work pieces |
| US4751360A (en) * | 1987-06-26 | 1988-06-14 | Ross Nicholas V | Apparatus for the continuous induction heating of metallic strip |
| DE3928629A1 (en) * | 1989-08-30 | 1991-03-14 | Junker Gmbh O | DEVICE FOR INDUCTIVE HEATING OF FLAT METAL GOODS |
-
2006
- 2006-02-09 CN CN2006800049238A patent/CN101120617B/en not_active Expired - Fee Related
- 2006-02-09 CN CN2006800048926A patent/CN101120616B/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103649346A (en) * | 2011-07-28 | 2014-03-19 | 杰富意钢铁株式会社 | Method for heating steel plate, and heating apparatus |
| CN103649346B (en) * | 2011-07-28 | 2016-08-17 | 杰富意钢铁株式会社 | The heating means of steel plate and heater |
| US10455648B2 (en) | 2011-07-28 | 2019-10-22 | Jfe Steel Corporation | Method and apparatus for heating steel sheet |
| CN104717771A (en) * | 2013-12-17 | 2015-06-17 | 北京交通大学 | Induction heating device for steel wire rope core belt |
| CN109971928A (en) * | 2019-04-16 | 2019-07-05 | 北京科技大学 | A kind of slab induction heating apparatus |
| CN109971928B (en) * | 2019-04-16 | 2023-09-15 | 北京科技大学 | Slab induction heating device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101120616B (en) | 2011-06-08 |
| CN101120617A (en) | 2008-02-06 |
| CN101120617B (en) | 2011-01-19 |
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