RU2605020C2 - Heating device and plant with it for heating continuous metal sheet - Google Patents

Abstract

FIELD: heating.

SUBSTANCE: invention relates to induction heating. For uniform heating a metal sheet over its width and providing the possibility of installing the device in a rolling line having a narrow space disclosed is a device for heating and a plant with it for heating a continuous metal sheet. Device for heating comprises poles located on at least one surface of a flat sheet spaced from each other to generate magnetic fields for heating the flat sheet and joint with the poles end leads to supply current and to facilitate the use of the space.

EFFECT: heating device can improve the structure of coils winding, such as the pole and the head, thus, finally, optimally heat a metal sheet effectively using the space.

8 cl, 6 dwg

Description

Technical field

The present disclosure relates to a heating device for heating a flat sheet, such as a metal sheet, by induction heating, more particularly, to a heating device and an apparatus for heating a continuous metal sheet containing it, capable of improving the structure of a coil winding, such as a pole and a head, and Thus, ultimately, it is optimal to heat the material (metal sheet), while effectively using space, in particular, providing the ability to easily form devices during rolling line having a narrow space, and uniformly heat the material (metal sheet) in the direction of its width.

BACKGROUND OF THE INVENTION

Cross Flow Induction Coil (TFIC), used to heat a flat sheet, such as a rolled sheet such as a metal sheet, or continuously passing metal sheet, is an induction heating technology developed based on a longitudinal flow induction coil (LFIC).

FIG. 1 and 2 illustrate the principle of heating a flat sheet, for example a metal sheet, using LFIC and TFIC, respectively, improved from LFIC.

For example, as illustrated in FIG. 1A, in the case of a magnetic field generated by LFIC horizontally applied to the metal sheet, eddy current can be generated in a vertical cross section of the metal sheet, and then, as illustrated in FIG. 1B, the thickness of the metal sheet must be three or more times the depth of penetration of the magnetic field (δ = √ (1 / nfµσ) for efficient heating of the metal sheet by eddy currents due to the fact that eddy currents flowing to the upper and lower sides of the metal sheet , should be prevented from colliding with each other and, accordingly, compensation (section A).

Accordingly, since the penetration depth must also be reduced, since the thickness of the metal sheet is reduced in the case of the known LFIC-based induction heating method, a high permeability (μ) of the material or a high operating frequency (f) of the device are required.

However, since permeability is an exceptional property of metal that cannot be controlled and has a value that is as low as that of air at the Curie point, it is only necessary to use the device at a high operating frequency. Since there is a limit to the implementation of high power power equipment, there is induction heating of non-magnetic metal sheets using LFIC.

Further, as illustrated in FIG. 2A, since the TFIC generates a magnetic field passing vertically through the metal sheet and the penetration depth is greater than the thickness of the metal sheet, the problem of compensating the induced eddy current is solved and, as illustrated in FIG. 2B, since eddy currents flowing through the upper and lower sections of the metal sheet have the same polarity and overlap each other to increase the current density, the heating effect can increase (P = I ^∧ 2 × R).

Accordingly, by induction heating a non-magnetic metal sheet or thin sheet, TFIC can achieve an effect of improving heating efficiency.

Meanwhile, although not illustrated, the original TFIC model is in the form of a simple rectangular winding, in which case the density of the eddy current induced in the steel sheet may be non-uniform in the width direction around the edge of the metal sheet.

This is the main problem that arises when using a simple rectangular winding and, as will be described in the present disclosure below, the coil head can be bent, and if the degree of curvature of the coil head is optimized (in width), the non-uniformity of heating of the metal sheet can be minimized.

However, a type of induction heating technology using a pair of TFIC heating (induction) coils on the upper and lower sides is disclosed in US Pat. No. 5,401,941.

This U.S. patent, although not illustrated in a separate drawing, uses TFICs located on the upper and lower sides, and a TFIC drive part, a matching part (capacitor, transformer, and the like) and a transport part (transport mechanism) are needed to control the location.

For example, in this U.S. patent, the TFIC pair should be located on opposite sides, taking into account the spaces for the matching part and the transport part associated with the induction coil, and the location of the device with two TFIC pairs is controlled for the correct position with the width of the metal sheet changing.

Accordingly, in the aforementioned US patent, due to the fact that the matching part for supplying current and the transport part (drive mechanism, drive frame and the like) for controlling the location of the induction coil are located on opposite sides, a large space is required for the operation of the device, and space limitation makes it is impossible to apply the device to a specific process, in particular, a rolling line having a very narrow installation space for peripheral devices. For example, in a continuous rolling line of a thin sheet on which the rolling process is continuously carried out after the continuous casting process, it is essentially impossible to apply TFIC according to the aforementioned US patent.

Furthermore, in a linear head (having a substantially rectangular winding), as described in this US patent, the width distribution of the temperature may become uniform to the extent that sufficient pole division is achieved, but if there is a spatial limit when installing the induction coil, as in the rolling line, it is especially difficult to evenly control the temperature distribution across the width from the center of the metal sheet to the edge of the metal sheet.

Disclosure

Technical problem

Thus, since a metal sheet or a continuous metal sheet, such as a rolled sheet, is heated, and a separate end terminal (having an extended length) is connected to a matching part for heating the metal sheet (for supplying current), a transport part (drive mechanism) for controlling the location heating (induction) coil according to changes in the width of the metal sheet, can be used (provided) space and, accordingly, a device for heating and its apparatus for n heating a continuous metal sheet in which the structure of the coil winding, such as the pole and the head, can be improved by simplifying the integration of the device, for example, into a rolling line having a narrow space, and uniformly heating the material (metal sheet) in the width direction, so that the material (metal sheet) can ultimately be optimally heated.

Technical solution

According to an aspect of the present disclosure, a heating device is provided, including: poles located on at least one surface of a flat sheet spaced apart from each other to generate magnetic fields for heating the flat sheet; and terminal leads for supplying current associated with the poles and promoting the use of space.

The poles and terminal leads include first and second poles and first and second conductors provided along the length of the metal sheet corresponding to the flat sheet or the direction of advancement of the continuous metal sheet, the terminal leads being connected to a matching part for supplying current and a transport part for controlling the location of the device and are placed on one side of the metal sheet.

The heating device further includes first and second heads provided on the first and second poles and configured to correspond to the first and second edges of the metal sheet, thereby the metal sheet is uniformly heated in the width direction.

The first and second heads are at least partially curved to uniformly heat the metal sheet.

The heating device further includes a third and fourth head adjacent to the first and second edges of the metal sheet at the first and second poles on the opposite side of the first and second heads.

The lead-in and lead-out conductors constituting the first terminal lead are sequentially curved and spaced apart to form the first head, while extending next to each other to be connected with the matching part and the transport part, and sequentially of the third head, in which the first pole and which connects to the end of the first pole and around which at least one single turn is wound.

The first pole and the first and third heads additionally include a connecting coil connected to the conductors, forming one with them, while at least two rows of single turns overlap and are provided next to the second head.

The lead-in and lead-out conductors constituting the second end terminal are spaced apart, extending so as to be connected to the matching part and the transport part, the second pole and the second head being formed sequentially, the fourth head being formed adjacent to and around the second end terminal at least one single turn.

The second pole and the second and fourth heads additionally include a stepped turn formed with them as a whole, with at least two rows of single turns overlap each other and connected to the end terminal next to the fourth head.

According to another aspect of the present disclosure, there is provided an apparatus for heating a continuous metal sheet, including at least two heating devices, including: rollers for advancing the metal sheet located on the upper and lower sides of the continuous metal sheet and provided on opposite sides of the devices for heating to advance the metal sheet, and the interval (t) between the centers of the poles of the heating devices satisfies the formula t <L × 0.75, where L = XD, L is and The interval between the centers of the advance rollers and D is the diameter of the advance rollers.

The heating devices located on the upper and lower sides of the metal sheet are facing each other, while the interval (h) between the poles of the upper and lower heating devices is from 60 to 150 mm, and the width (a) between the first and second poles, provided in the heating devices, satisfies the formula 0.5t <a <0.75t.

Advantage effects

According to the present disclosure, a continuous metal sheet, such as a metal sheet or a rolled sheet, is heated, and an end terminal (having a length) is provided that is associated with a matching heating part and a transport part (drive mechanism) for controlling location.

Accordingly, the present disclosure allows you to save space and, in particular, the device can be easily integrated into a rolling line having a narrow space, or the like.

In addition, the sheet may be uniformly heated in the width direction.

In particular, according to the present disclosure, the metal sheet can ultimately be optimally heated by improving the structure of the coil winding of the pole, head, or the like.

Brief Description of the Drawings

In FIG. 1A and 1B are a diagram and a view of an operating state illustrating the LFIC according to the prior art;

in FIG. 2A and 2B are a diagram and a view of an operating state illustrating a TFIC according to the prior art;

in FIG. 3 is a plan view illustrating a heating apparatus according to the present disclosure for a flat sheet material (metal sheet and thin sheet);

in FIG. 4 is a perspective view illustrating a heating apparatus according to an embodiment of the present disclosure;

in FIG. 5 is a graph depicting the temperature distributions on the output sides of TFIC coils (coil A and coil B) and the temperature distribution in combination with the heating device of FIG. 4 according to an embodiment of the present disclosure; and

in FIG. 6 is a side view illustrating an apparatus for heating a continuous metal sheet in which the upper and lower coils of a heating device according to the present disclosure are applied to a continuous metal sheet.

The best option of the invention

Further in this document, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

The disclosure may, however, be implemented in many different forms and should not be construed as limited to the implementation options set forth herein. Rather, these implementations are provided so that this description is comprehensive and complete, and fully conveys the scope of the disclosure to those skilled in the art.

In the drawings, the shapes and sizes of elements can be exaggerated for clarity, and the same reference numbers will be used throughout to refer to the same or similar elements.

Firstly, FIG. 3 and 4 illustrate a heating device 1 for heating a flat sheet material, for example a metal sheet 10, by the TFIC method as described above, according to the present disclosure, and FIG. 6 illustrates an apparatus 1 for heating a continuous metal sheet in which a pair of heating devices 1 according to the present disclosure are placed on the upper and lower sides of a continuous metal sheet 10 ′ (for example, a continuous rolled sheet (thin sheet) on which a rolling process is performed after the continuous process casting), which is continuously moving.

Accordingly, in the following description of embodiments of the present disclosure, the heating apparatus 1 of FIG. 3 and 4 according to the present disclosure, and the apparatus for heating the continuous metal sheet of FIG. 6 according to the present disclosure based on the description of the heating device 1.

At the same time, as will be described below, in an embodiment of the present disclosure, important factors when heating the edges of the metal sheet are that all of the first to fourth heads 70, 170, 90, and 190 are arranged to correspond to the first edge 12 (e.g., the right edge of the relative longitudinal direction of the metal sheet or the direction of advancement of the continuous metal sheet) and the second edge 14 (for example, the left edge of the relative longitudinal direction of the metal sheet or direction of advancement of the continuous yvnogo metal sheet) of the metal plate 10, or provided near the edges, and all the first to fourth heads 70, 170, 90 and 190 define the steps between the first and second poles 30 and 130.

At the same time, in an embodiment of the present disclosure, which is illustrated in FIG. 4, at least partially curved heads are referred to as first and second heads 70 and 170, and linear (four-sided) heads connected between the poles are referred to as third and fourth heads 90 and 190.

Although the numerical designations of the metal sheet 10, which is a simple flat sheet, and the continuous metal sheet 10 ′, which is continuously advancing, differ in the description of the embodiment of the present disclosure, it is obvious that the heating device 1 according to the present disclosure can be applied to the metal sheet 10 and continuous metal sheet 10 ′, as described above.

Accordingly, an exemplary embodiment of the present disclosure will be described in the following.

First, as illustrated in FIG. 3, the heating device 1 according to the present disclosure may include poles 3 located on at least one surface of the metal sheet 10 spaced from each other to generate magnetic fields for heating the metal sheet 10, and end leads 5 to facilitate the use of space in the device in combination with poles 3.

Accordingly, as illustrated in FIG. 3, since the heating device 1 according to the present disclosure includes a separate end terminal 5, which may extend further, an environment is provided for efficiently utilizing the required space in which the end terminal extends.

For example, since the matching part for supplying current and controlling the location (location control according to changes in the width of the metal sheet), the M / T transport part, the terminal leads are connected to each other, the connection between the matching part and the M / T transport part and device control cannot represent a problem even if the terminal leads 5 are aligned in the same line with respect to one edge of the metal sheet 10, as illustrated in FIG. 3, and as a result, the device according to the present disclosure can be applied in a rolling line having a narrow space.

Further, the matching part is a current supply configuration, and the transport part is a configuration known as a drive mechanism.

Accordingly, the heating device 1 according to the present disclosure eliminates spatial restrictions, as in US Pat. No. 5,401,941, in particular even on a rolling line in which space cannot be easily used, for example, by using the continuous rolling process of a thin sheet (rolled sheet), wherein the rolling process is continuously performed along with the continuous casting process.

After arranging the terminal terminals 5 according to the present disclosure, the first and second terminal terminals 50 and 150, described in more detail with reference to FIG. 4 can be connected to each other in a suitable environment based on the desired spatial arrangement if the lengths of the terminal leads between the matching part and the transport part (MT in FIG. 3) provided for supplying current and controlling the location of the heating device are adjusted in accordance with the edge of the metal plate for uniform heating of the metal sheet in the width direction with a significant change in the width of the metal sheet.

Of course, as illustrated in FIG. 3, it is preferable that the terminal leads 5 of the heating device 1 according to the present disclosure are located only adjacent to either the first edge 12 or the second edge 14 of the metal sheet 10. For example, this is because if the terminal leads 5 are placed on the first edge 12 and on the second edge 14 of the metal sheet, space is needed on opposite sides of the metal sheet.

Further, FIG. 4 illustrates an exemplary embodiment of a heating device 1 according to the present disclosure, which is described with reference to FIG. 3.

That is, as illustrated in FIG. 4, a heating device according to the present disclosure may include first and second poles 30 and 130 constituting at least one pair of poles 3 provided in the longitudinal direction (e.g., the advance direction of the rolled sheet 10 ′) of the metal sheet 10, and the first and the second end leads 50 and 150 constituting the end lead 5, and then, as described above, it is preferable that the first and second end leads 50 and 150 are located only next to one side of the metal sheet 10, for example, associated with matching alyu and transport the workpiece M / T (see. FIG. 3), for example, only near the first edge 12 in the embodiment of the present disclosure.

At the same time, in the next embodiment of the present disclosure, the edge of the metal sheet 10 next to the matching part and the transport part (M / T in FIG. 3) is referred to as the first edge 12, and the opposite edge is referred to as the second edge 14.

Then, essentially, the first and second poles 30 and 130 and the first and second end terminals 50 and 150 are continuously formed by winding single turns C by bending, bending, and the like, and a plurality of single turns C can overlap each other.

Although not illustrated in the drawings, while the location of the heating devices 1 is controlled to correspond to a change in the width of the metal sheet, the movement of the coils C of the heating devices according to the present disclosure located on the upper and lower sides of the metal sheet at a predetermined interval can be guided guide block.

As illustrated in FIG. 4, although it is preferable that the heating devices according to the present disclosure are located on the upper and lower sides of the metal sheet 10, respectively, taking into account the heating of the upper and lower surfaces of the metal sheet, they can only be placed on the upper or lower sides of the metal sheet.

More preferably, as illustrated in FIG. 4, the heating device further includes first and second heads 70 and 170 provided on the first and second poles 30 and 130 and arranged to correspond to the first and second edges 12 and 14 of the metal sheet 10, so that the metal sheet can be heated evenly in width direction by providing a suitable environment for heating the edges of the metal sheet.

Of course, it is obvious that the location of the first and second heads 70 and 170 can be adjusted to match the locations of the first and second edges 12 and 14, which change when the width of the metal sheet changes, through the medium of the transport part associated with the end terminal.

Further, preferably, as illustrated in FIG. 4, the first and second heads 70 and 170 are partially curved.

That is, the first and second heads 70 and 170 are at least partially bent, since the metal sheet can be uniformly heated in the width direction with the first and second heads 70 and 170, and, for example, when the first and second heads 70 and 170 are at least partially curved, most preferred are the first and second heads 70 and 170, which are circular, while the metal sheet can be uniformly heated in the width direction.

The degrees of curvature of the first and second heads 70 and 170 can be determined under optimal conditions during numerical analysis, so that the temperature distribution in the width direction at the edge portion of the metal sheet can be uniform.

At the same time, FIG. 5 is a graph showing the separate temperature distributions of the TFIC pair (A and B) in the directions along the width of the metal sheet and the temperature distribution (A + B) obtained by combining the individual distributions in the heating device 1 according to the present disclosure when the first and second heads 70 and 170 are optimally bent.

That is, as illustrated in FIG. 5, it can be seen that the reference indicator A + B denotes the temperature distribution obtained by combining the temperature distributions across the width of the TFIC A coil and TFIC B coil.

In particular, in the graph of FIG. 5, it can be seen that the combined temperature distribution (A + B) over the width of the metal sheet can be substantially uniform in the direction along the width of the metal sheet, except for the edge portion of the metal sheet, due to the properly curved first and second heads located adjacent to the edges of the metal sheet sheet between a width of 400 to 620 mm or from -400 to -620 mm of a metal sheet along the X axis.

Accordingly, it can be seen that the heating device according to the present disclosure, including at least partially curved first and second heads 70 and 170, can evenly heat the metal sheet (rolled sheet) in the width direction of the metal sheet.

The first and second heads 70 and 170 heat the metal sheet, with the location of the first and second heads 70 and 170 being sequentially controlled to correspond to the first edge 12 and the second edge 14 in the longitudinal direction (advance direction) of the metal sheet.

That is, more preferably, the heating device 1 according to the present disclosure further includes a third and fourth head 90 and 190 adjacent to the second and first edges 14 and 12 of the metal sheet 10 provided on the first and second poles 30 and 130 on the opposite side the first and second heads 70 and 170, so that a closed induction coil is formed as a whole, while single turns are wound.

In this case, the third and fourth heads 90 and 190 can be located to provide an edge space to compensate for changes in the width of the metal sheet when deviating from the edges of the metal sheet.

Further, as illustrated in FIG. 4, in a heating unit located in a longitudinal direction from the inlet side of the metal sheet and including a first pole 30, a first end terminal 50 and a first and third head 70 and 90 of a heating device 1 according to the present disclosure, the first end terminal includes a supply and lead-out conductors 50a and 50b for introducing and diverting currents, the conductors being adjacent to each other and extending to connect with a matching part and a transport part (M / T in FIG. 3).

The first pole 30 is formed immediately after the terminal leads, curved and spaced from the first edge 12 of the metal sheet 10 to form a first head 70 corresponding to the first edge 12 of the metal plate 10, and a third head 90 is formed, connected to the end of the first pole 30.

Further, to create a suitable heating environment, the first pole 30 and the first and third heads 70 and 90 can be connected to conductors and at least two rows of single turns C can be wound entirely to overlap each other.

Preferably, when the first pole 30 is formed by winding two rows of single turns, a connecting turn C ′ is provided next to the second head for step compensation for connecting to the outermost lead-in conductor 50a.

Although the connecting turn C ′ may be connected to the single turns C by welding and the like, the turns can be provided as a whole by pre-bending, bending and forming steps to avoid problems during the welding process.

Further, even in the heating unit having the second pole 130, the second end terminal 150 and the second and fourth heads 170 and 190 in the longitudinal direction of the metal sheet, as illustrated in FIG. 4, the current input and output conductors 150a and 150b of the second end terminal 150 are spaced apart and extend to connect to the matching part and the M / T transport part, and in this case, the second pole 130 and the curved second head 170 are sequentially formed, and the fourth head 190 can be formed near the end terminal.

That is, the second pole 130 and the second and fourth heads 170 and 190 can be formed as a whole, with at least two rows of single turns C wound to overlap each other, and a stepped turn C ″ connected to the current-conducting conductor 150a can be provided next to the fourth head 190, and a stepped turn is provided to compensate for the thickness of the coil, if it is integrally connected to the end terminal.

At the same time, in the heating device 1 according to the present disclosure, with the heating units located higher and lower in the direction of travel, the first and second heads 70 and 170 are arranged to correspond to the first and second edges 12 and 14 of the metal sheet for accurately heating the edge of the metal sheet in the longitudinal the direction (or in the direction of advancement of the continuous metal sheet 10 ′ in FIG. 6) of the metal sheet 10, and the third and fourth heads 90 and 190 are located near the edge of the metal sheet with sufficient tolerance, and respectfully located on the spot where the third and fourth heads 90 and 190 pass through the metal sheet.

Accordingly, as illustrated in FIG. 4, the metal sheet can be uniformly heated in the width direction, with the first edge 12 of the metal sheet 10 passing between the first head 70 and the first pole, and the second edge 14 of the metal sheet 10 passing between the second head and the second pole 130.

Then, as illustrated in FIG. 4, it is preferable that the frequency supplied to the coil according to the present disclosure is 3 kHz or less, and the number of windings of the single turns C, which determines the shape of the device, is 5 or less. For example, as the number of windings increases, the interval between the windings and the cooling structure can become difficult and, thus, there may be a problem in aspects of production costs and maintenance.

Further, FIG. 6 illustrates the upper and lower cross sections of one TFIC coil of apparatus 1 ′ for continuously heating a metal sheet based on a heating device 1 according to the present disclosure and, for example, sections of a pair of heating devices 1 placed on the upper and lower sides of a metal sheet 10 ′ ( for example, a thin rolled sheet on a continuous rolling line) to face each other, and the transport rolls 2 for the metal sheet are located with the input and output along the sides of the device for heating a.

The heating devices 1 are located inside the chambers 4 to form a heating space for dissipating heat and interrupting the leakage of magnetic fluxes, and the transport rolls 2 for the metal sheet can be located in the spaces for introducing and removing the metal sheet on opposite sides of the chambers 4.

Further, in FIG. 6, X denotes the distance between the centers of the transport rolls 2, L denotes the interval between the transport rolls, D denotes the diameter of the transport rolls, t denotes the distance between the centers of the sections of the heating devices located above and below in the direction of travel from one pair of heating devices, d denotes the thickness metal sheet and H denotes the difference in height between the single turns C of heating devices located on the upper and lower sides facing each other.

At the same time, preferably in the apparatus 1 ′ according to the present disclosure for continuous heating of the metal sheet, t satisfies the condition t <L × 0.75, (L = XD) and here L denotes the interval between the transport rolls, X denotes the interval between the centers of the transport rolls, a D denotes the diameter of the transport rolls.

That is, it is preferable that t be less than 75% of L in order to correspond to the interval (distance) between the transport rolls, which is associated with the difficulty of placing the desired coil on a given interval if the condition deviates compared to the interval between the centers of the pair of heating devices.

In addition, as illustrated in FIG. 6, it is preferable that the interval h between the single turns C of the first and second poles 30 and 130 of the pair of upper and lower heating devices 1 is from 60 to 150 mm, and if the condition deviates, that is, the interval h is 60 mm or less, single the turns of the heating devices are too close to the metal sheet, so that the coils can be damaged due to a collision, and if the interval h is more than 150 mm, the heating efficiency is significantly reduced.

It is more preferable that the maximum width of the single turns between the first and second poles 30 and 130 provided in the heating device 1 satisfy the condition 0.5t <a <0.75t, and when the maximum width a is less than 0.5t, the width of the induction the coil is too reduced, so that the heating ability is reduced, and if the maximum width a is more than 0.75t, there is a space limitation in such a way that it is difficult to manufacture the heating device 1.

Industrial applicability

Accordingly, a heating apparatus and apparatus for heating a continuous metal sheet including a heating apparatus according to the present disclosure include a separate end terminal associated with a matching part and a transport part, and in particular, a metal sheet, especially a continuous metal a sheet, such as a rolled sheet that is continuously advancing, can be optimally heated using a structure of first to fourth heads using windings.

For example, the heating device and the apparatus for heating a continuous metal sheet according to the present disclosure may be configured to have a low frequency when the thin material and the non-magnetic body are heated by the TFIC method, and the electric heating efficiency can be increased compared to the existing LFIC, even if the change the thickness of the material is greater, and since features of overheating of the edges of the metal sheet can be provided, which are cooled more easily than the central section of the sheet, separate edge heater not required.

Accordingly, the feature of the heating device according to the present disclosure can realize the uniformity of the final product, since the space consumption due to the installation of an additional edge heater can be eliminated, and the temperature loss at the edge can be compensated in the case of, for example, a mini-factory process such as CEM, for continuous rolling of a thin sheet.

Furthermore, since the material does not pass through the solenoid coil, as in the case of the LFIC, it can be easily moved to the desired location in the absence of heating, so that the device can function correctly to match line repair or in the event of a sudden accident.

In particular, since the matching part and the transport part, which act as limiters when using the rolling line in the heating device, according to the present disclosure are placed on one side of the metal sheet, space utilization can be maximized.

Claims (8)

1. A device for heating a continuous metal sheet containing
poles located on at least one surface of the flat sheet spaced from each other to generate magnetic fields for heating the flat sheet and
end terminals for supplying current together with the poles,
wherein the poles and terminal leads include first and second poles and first and second conductors provided in the longitudinal direction of the metal sheet corresponding to the flat sheet, or in the direction of advancement of the continuous metal sheet, while the terminal leads are connected to a matching part for supplying current and a transport part for controlling the location of the device and placed on one side of the metal sheet,
the first and second heads provided on the first and second poles and placed so as to correspond to the first and second edges of the metal sheet, for uniform heating of the metal sheet in the direction along its width,
third and fourth heads, located next to the second and first edges of the metal sheet, provided on the first and second poles on the opposite side from the first and second heads. 2. The heating device according to claim 1, wherein the first and second heads are at least partially bent to uniformly heat the metal sheet. 3. The heating device according to claim 1, wherein the current-conducting and conducting wires constituting the first terminal terminal are sequentially curved and spaced apart to form the first head, extending adjacent to each other to be connected with the matching part and the transport part , and sequentially with the third head, in which the first pole is formed, and which is connected to the end of the first pole, and two rows of single turns are formed. 4. The heating device according to claim 3, in which the first pole and the first and third heads further comprise a connecting coil connected to the terminal leads and formed with them as a whole, while at least two rows of single turns overlap and are provided next to the second head. 5. The heating device according to claim 1, wherein the current-conducting and conducting wires constituting the second terminal terminal are spaced from each other so as to extend and be connected to the matching part and the transport part, wherein the second pole and the second head are formed sequentially , a fourth head is formed adjacent to the second end terminal, and two rows of single turns are formed. 6. The heating device according to claim 5, in which the second pole and the second and fourth heads further comprise a stepped turn formed with them as a whole, with at least two rows of single turns overlap and connected to the end terminal next to fourth head. 7. Apparatus for heating a continuous metal sheet containing at least two devices for heating according to any one of paragraphs. 1-6 and
transport rolls for advancing the metal sheet located on the upper and lower sides of the continuous metal sheet and provided on opposite sides of said devices for heating the continuous metal sheet,
the distance (t) between the centers of the poles of the above-mentioned heating devices satisfies the formula t <L × 0.75, where L = XD, L is the distance between the transport rolls, X is the distance between the centers of the transport rolls, and D is the diameter of the transport rolls. 8. The heating apparatus according to claim 7, wherein said heating devices are located on the upper and lower sides of the metal sheet and face each other, wherein the distance (h) between the poles of the upper and lower heating devices is from 60 to 150 mm and the width (a) between the first and second poles provided in the heating devices satisfies the formula 0.5t <a <0.75t.

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