A combined slab heating device system and a continuous casting and rolling production line

Abstract

This application relates to a combined slab heating device system, comprising a transverse magnetic induction heating unit, a longitudinal magnetic induction heating unit, and a local heating unit. The transverse magnetic induction heating unit generates an induced magnetic field that passes laterally through the plane of the slab being heated, while the longitudinal magnetic induction heating unit generates an induced magnetic field that acts within the slab being heated, with magnetic lines of force passing longitudinally through the slab. The device provided in this application, through a rational arrangement of the combined slab heating devices, leverages the advantages of various types of heaters. Furthermore, when the local heating unit is operating, it drives a slider to move left and right, causing the electric heating head to move left and right to a relatively lower temperature position, thus heating the lower-temperature slab area and achieving uniform slab temperature, thereby ensuring product quality on the production line.

Description

Technical Field

[0001] This application relates to the field of slab heating technology, and in particular to a combined slab heating device system and a continuous casting and rolling production line. Background Technology

[0002] Currently, continuous casting and rolling production lines have the advantages of high efficiency and energy saving, as well as hot-cooling technology, and are therefore being used more and more widely.

[0003] Because the speed of the rolling mill in a continuous casting and rolling production line is limited by the casting speed of the continuous casting machine, secondary heating of the continuously cast billet or intermediate slab is generally required. Existing heating devices mostly use electromagnetic induction heating technology, which typically has two technical solutions: transverse magnetic electromagnetic induction heating technology and longitudinal magnetic electromagnetic induction heating technology.

[0004] Current technologies typically employ a single technical solution, while these two heating technologies each have their uses and advantages and disadvantages. The transverse magnetic solution has the advantages of high heating efficiency and high power density, but it also has the disadvantage of uneven transverse temperature; the longitudinal magnetic solution has the advantages of overall uniform transverse temperature, but it has the disadvantages of lower heating efficiency, lower power density, and a temperature sandwich effect with high and low temperatures along the thickness direction of the slab cross-section. Therefore, we propose a combined slab heating device system and a continuous casting and rolling production line. Summary of the Invention

[0005] This application provides a combined slab heating device system and a continuous casting and rolling production line. By combining the application of three types of heating devices, the advantages of the two types of electromagnetic induction heating technologies, namely the transverse magnetic and the longitudinal magnetic, are fully utilized and utilized, thereby overcoming the disadvantage of uneven transverse temperature in the transverse magnetic scheme and the disadvantages and problems of the longitudinal magnetic scheme, such as low heating efficiency, low power density, and temperature sandwich effect with high and low temperatures in the thickness direction of the slab cross section. This application provides a combined slab heating device system. The combined slab heating device system includes a transverse magnetic electromagnetic induction heating unit, a longitudinal magnetic electromagnetic induction heating unit, and a local heating unit. The at least one transverse magnetic electromagnetic induction heating unit and the at least one longitudinal magnetic electromagnetic induction heating unit are the main heating equipment, while the multiple local heating units only have the function of compensating for low-temperature zones.

[0006] The induced magnetic field generated by the transverse magnetic induction heating unit passes transversely through the plane of the slab being heated, and the induced magnetic field generated by the longitudinal magnetic induction heating unit acts on the slab being heated. The magnetic lines of force pass longitudinally through the slab being heated, and the magnetic lines of force are approximately parallel to the longitudinal axis of the slab. The local heating unit is used to heat a local area of ​​the slab.

[0007] Preferably, the longitudinal magnetic electromagnetic induction heating unit is provided with a first coil and a first terminal. The first coil inside the longitudinal magnetic electromagnetic induction heating unit is a multi-turn coil wound with equal spacing between turns, and both ends of the coil are led out from the first terminal. A first protective shell is provided on the outside of the first coil. The transverse magnetic electromagnetic induction heating unit is provided with a second coil, a third coil, a second terminal, and a third terminal. The second coil and the third coil are arranged vertically opposite each other, and a second protective shell is provided on the outside of each. The second coil and the third coil are respectively connected to the second terminal and the third terminal. The second coil and the third coil together generate a transverse magnetic field with the same direction that passes through the heated slab.

[0008] Preferably, the system includes at least one of the aforementioned local heating units, denoted as j1, j2, j3, j4...jn, and each local heating unit includes a frame housing with a rectangular window through which the slab to be heated passes. A local heating device is disposed inside the frame housing, which is a pair of heating heads respectively disposed above and below the slab to be heated. The system also includes a local heating device moving mechanism to move the position of the local heating device to achieve local heating of different positions on the slab. The heating head can be a transverse magnetic electromagnetic induction heating head, a longitudinal magnetic electromagnetic induction heating head, or a medium combustion heating head.

[0009] Preferably, the frame housing includes upper and lower sliding grooves, upper and lower front temperature probes, and upper and lower rear temperature probes. The upper and lower sliding grooves are each equipped with upper and lower front temperature probes and upper and lower rear temperature probes, and the upper and lower sliding grooves are located above and below the heated slab, respectively. The upper and lower sliding grooves are each equipped with upper and lower sliders, and the upper and lower sliders are respectively connected to the upper and lower heating heads.

[0010] Preferably, upper and lower screws are respectively inserted into the middle of the upper and lower sliders through screw holes. The upper and lower sliders are each provided with screw holes that match the upper and lower screws. The upper and lower screws pass through the screw holes of the upper and lower sliders. One end of each screw is connected to a bearing fixed to one side of the frame housing, and the other end is connected to an upper and lower driven gear turntable located on the same side of the frame housing through a bearing located on the other side of the frame housing. The upper and lower driven gear turntables are both meshed with a main drive gear turntable. The main drive gear turntable is sleeved on the reducer drive shaft, and the input shaft of the reducer is connected to the motor shaft. The main drive gear turntable drives the upper and lower driven gear turntables, and through the upper and lower screws and the upper and lower sliders, the upper and lower heating heads move laterally.

[0011] Preferably, a combined slab heating device system, The combined slab heating device system includes at least two of the above three types of heating units, and the combination of the three types of heating units in the combined slab heating device system is as follows: The method involves at least one transverse magnetic induction heating unit plus at least one downstream local heating unit; The method involves at least one longitudinal magnetic electromagnetic induction heating unit plus at least one downstream local heating unit; The method comprises at least one transverse magnetic electromagnetic induction heating unit, at least one longitudinal magnetic electromagnetic induction heating unit, and at least one downstream local heating unit, wherein the arrangement order of the at least one transverse magnetic electromagnetic induction heating unit and the at least one longitudinal magnetic electromagnetic induction heating unit is not limited.

[0012] Preferably, in the combined slab heating device system, the power weight (number of units × power per unit) of the longitudinal magnetic electromagnetic induction heating unit increases with the increase of the thickness of the heated slab, while the power weight (number of units × power per unit) of the transverse magnetic electromagnetic induction heating unit decreases with the increase of the thickness of the heated slab.

[0013] Preferably, multiple local electromagnetic induction heating units are used in combination to achieve temperature compensation heating of different low-temperature regions of the heated slab, thereby achieving the final temperature uniformity of the heated slab.

[0014] Preferably, the upper and lower front temperature probes and the upper and lower rear temperature probes in the local heating unit detect the temperature of the slab to be heated before and after the upper and lower heating heads, and send the temperature signals to the control system, thereby realizing the control of the heating energy of the heating head and realizing the temperature control of local heating.

[0015] Preferably, the continuous casting and rolling production line uses the aforementioned combined slab heating device system, whose components include, but are not limited to: a slab continuous casting machine, a roughing mill, a head cutter, a combined slab heating device system, a descaling device, a finishing mill, a flying shear device, and a coiling device. The slab continuous casting machine, roughing mill, head cutter, descaling device, finishing mill, flying shear device, and coiling device are arranged sequentially upstream and downstream. The combined slab heating device system may be located only between the continuous casting machine and the roughing mill, or only between the roughing mill and the descaling device, or both of the above locations may be provided simultaneously.

[0016] The technical solutions provided in this application have the following advantages compared with the prior art: The device provided in this application embodiment, through the reasonable arrangement of the combined slab heating devices, not only gives full play to the advantages of various types of heaters, but also, when the local heating device is working, it drives the slider to move left and right, causing the electric heating head to rotate forward and backward, moving to a position with a relatively low temperature, and heating the slab position with a lower temperature, thus achieving the purpose of slab temperature uniformity, while ensuring the product quality of the production line. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 The present application provides an embodiment of a combined slab heating device system and an overall structure of a continuous casting and rolling production line; Figure 2 A structural diagram of a combined slab heating device system and a continuous casting and rolling production line, including a longitudinal magnetic electromagnetic induction heating unit, a transverse magnetic electromagnetic induction heating unit, and a local heating unit, provided for embodiments of this application. Figure 3 A structural diagram showing the arrangement of longitudinal magnetic electromagnetic induction heating unit, transverse magnetic electromagnetic induction heating unit, and local heating unit in a combined slab heating device system and continuous casting and rolling production line provided in this application embodiment; Figure 4 A diagram illustrating the internal structure of a combined slab heating device system and a transverse magnetic heating device in a continuous casting and rolling production line, provided as an embodiment of this application. Figure 5 A combined slab heating device system and an internal structural diagram of the longitudinal magnetic heating device in a continuous casting and rolling production line provided in this application embodiment; Figure 6 A cross-sectional view along the transverse direction of a combined slab heating device system and a local heating device of a continuous casting and rolling production line provided in the embodiments of this application; Figure 7 A side sectional view along the longitudinal direction of the slab, illustrating a combined slab heating device system and a local heating device in a continuous casting and rolling production line provided in this application embodiment.

[0020] Figure 8This is a schematic diagram of a combined slab heating device system and multiple local heating units in a continuous casting and rolling production line, provided as an embodiment of this application.

[0021] In the diagram: 1. Frame housing; 2. Upper and lower sliding grooves; 3. Upper and lower sliders; 4. Upper and lower heating heads; 5. Upper and lower screws; 6. Upper and lower front temperature probes; 7. Upper and lower rear temperature probes; 8. Heated slab; 9. Upper and lower driven gear turntables; 10. Main drive gear turntable; zx1, first coil; zj1, first terminal; hx1, second coil; hx2, third coil; hj3, second terminal; hj4, third terminal; j1, first local heating unit; j2, second local heating unit; j3, third local heating unit; j4, fourth local heating unit. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] Various embodiments of this application may exist in the form of a range. It should be understood that the description in the form of a range is merely for convenience and brevity and should not be construed as a rigid limitation on the scope of this application. Therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values ​​within that range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and single numbers within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. In addition, whenever a numerical range is indicated in this application, it means including any referenced number (fraction or integer) within the indicated range. Unless otherwise specified, all raw materials, reagents, instruments, and equipment used in this application can be purchased commercially or prepared by existing methods.

[0024] In this application, unless otherwise stated, directional terms such as "upper" and "lower" specifically refer to the drawing directions in the accompanying drawings. Furthermore, in this application, the terms "comprising," "including," etc., mean "including but not limited to." In this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. In this application, "and / or" describes the relationship between related objects, indicating that three relationships may exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. A and B can be singular or plural. In this application, "at least one" means one or more, and "more than one" means two or more. "At least one," "at least one of the following," or similar expressions refer to any combination of these items, including any combination of a single item or a plural item. For example, "at least one of a, b, or c" or "at least one of a, b, and c" can both mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be a single or multiple.

[0025] like Figures 1 to 8 As shown in the embodiment of this application, the combined slab heating device system includes a transverse magnetic electromagnetic induction heating unit, a longitudinal magnetic electromagnetic induction heating unit, and a local heating unit.

[0026] The induced magnetic field generated by the transverse magnetic induction heating unit passes laterally through the plane of the heated slab, the induced magnetic field generated by the longitudinal magnetic induction heating unit acts on the heated slab and the magnetic lines of force pass longitudinally through the heated slab, the induced magnetic field generated by the transverse magnetic induction heating unit acts on the heated slab and the magnetic lines of force pass laterally through the heated slab, and the local heating unit is used to heat a local area of ​​the slab.

[0027] Specifically, the equipment operates in three modes: transverse magnetic electromagnetic induction heating unit, longitudinal magnetic electromagnetic induction heating unit, and local heating unit. In mode 1, at least one transverse magnetic electromagnetic induction heating unit and multiple local heating units are in operation.

[0028] Mode 2, where at least one longitudinal magnetic electromagnetic induction heating unit is in operation and multiple local heating units are in operation.

[0029] Mode 3 involves at least one transverse magnetic electromagnetic induction heating unit, at least one longitudinal magnetic electromagnetic induction heating unit, and multiple local heating units.

[0030] refer to Figure 4 and Figure 5As shown: The longitudinal magnetic electromagnetic induction heating unit may be zero or at least one, and the at least one unit may be denoted as z1, z2, z3, z4...zn. Each longitudinal magnetic electromagnetic induction heating unit contains a first coil zx1 and a first terminal zj1. The first coil zx1 is a multi-turn coil wound with equal spacing between turns, and both ends of the coil are led out from the first terminal zj1. A first protective shell is provided on the outside of the first coil zx1. The transverse magnetic electromagnetic induction heating unit may be zero or at least one, and at least one unit may be provided. The coils are respectively labeled h1, h2, h3, h4...hn. The transverse magnetic induction heating unit is equipped with a second coil hx1, a third coil hx2, a second terminal hj3, and a third terminal hj4. The second coil hx1 and the third coil hx2 are arranged vertically opposite each other, and each is provided with a second protective shell on its outer side. The second coil hx1 and the third coil hx2 are respectively connected to the second terminal hj3 and the third terminal hj4. The second coil hx1 and the third coil hx2 together generate a transverse magnetic field with the same direction that passes through the heated slab.

[0031] Specifically: the second protective housing is for protecting the second coil h1 and the third coil h2, and the first protective housing z4 is for protecting the first coil z2.

[0032] refer to Figure 3 As shown: It includes at least one of the aforementioned local heating units, denoted as j1, j2, j3, j4...jn, and each local heating unit includes a frame housing 1. The frame housing 1 has a rectangular window through which the slab to be heated passes. A local heating device is provided inside the frame housing 1. The local heating device is a pair of heating heads respectively located above and below the slab to be heated, and also includes a local heating device moving mechanism, which can realize the position movement of the local heating device to achieve local heating of different positions of the slab. The heating head can be a transverse magnetic electromagnetic induction heating head, a longitudinal magnetic electromagnetic induction heating head, or a medium combustion heating head.

[0033] refer to Figure 4 As shown: The frame housing 1 includes upper and lower sliding grooves 2, upper and lower front temperature probes 6, and upper and lower rear temperature probes 7. The upper and lower sliding grooves 2 are each equipped with upper and lower front temperature probes 6 and upper and lower rear temperature probes 7, and the upper and lower sliding grooves 2 are respectively located above and below the heated slab. The upper and lower sliding grooves 2 are each equipped with upper and lower sliders 3, and the upper and lower sliders 3 are respectively connected to the upper and lower heating heads 4.

[0034] Specifically: the upper and lower front temperature probes 6 and the upper and lower rear temperature probes 7 adopt existing temperature probes on the market, which can scan and detect the temperature of the upper and lower surfaces of the running slab. The upper and lower front temperature probes 6 and the upper and lower rear temperature probes 7 are connected to a controller built on an external computer.

[0035] refer to Figure 5 As shown: The upper and lower sliders 3 are respectively connected to upper and lower screws 5 through screw holes in their middle parts. The upper and lower sliders 3 are each provided with screw holes that match the upper and lower screws 5. The upper and lower screws 5 pass through the screw holes of the upper and lower sliders 3. One end of each screw is connected to a bearing fixed to one side of the frame housing 1, and the other end is connected to the upper and lower driven gear turntables 9 on the same side of the frame housing 1 through a bearing on the other side of the frame housing 1. The upper and lower driven gear turntables 9 are both meshed with the main drive gear turntable 10. The main drive gear turntable 10 is sleeved on the reducer drive shaft, and the input shaft of the reducer is connected to the motor shaft. The main drive gear turntable 10 drives the upper and lower driven gear turntables 9, and through the upper and lower screws 5 and the upper and lower sliders 3, the upper and lower heating heads 4 move laterally.

[0036] Specifically: The upper and lower heating heads 4 are fixed using existing equipment on the market and are connected to external power supply and heating equipment. The upper and lower heating heads 4 can be moved relative to each other or in opposite directions. The upper and lower heating heads 4 are fixed in the middle. The fixed upper and lower heating heads are symmetrically arranged at the upper and lower ends of the strip. There are four fixed upper and lower heating heads, which are symmetrically arranged on the left and right sides of the upper and lower sliders 3. The purpose of the upper and lower heating heads 4 is to heat the three low-temperature zones generated on the slab by the front horizontal magnetic induction heater: the central low-temperature zone and the two symmetrical low-temperature zones on both sides.

[0037] refer to Figure 5 As shown: A combined slab heating device system. The combined slab heating device system includes at least two of the following three types of heating units, and the combination of the three types of heating units in the combined slab heating device system is as follows: Method 1: At least one transverse magnetic electromagnetic induction heating unit plus at least one downstream local heating unit; Method 2: At least one longitudinal magnetic electromagnetic induction heating unit plus at least one downstream local heating unit; Method 3: at least one transverse magnetic electromagnetic induction heating unit plus at least one longitudinal magnetic electromagnetic induction heating unit plus at least one downstream local heating unit, wherein the arrangement order of the at least one transverse magnetic electromagnetic induction heating unit and the at least one longitudinal magnetic electromagnetic induction heating unit is not limited.

[0038] Specifically, the equipment is used in three modes: horizontal magnetic electromagnetic induction heating unit, vertical magnetic electromagnetic induction heating unit, and local heating unit.

[0039] Mode 1: At least one transverse magnetic induction heating unit is in operation and multiple local heating units are in operation.

[0040] Mode 2, where at least one longitudinal magnetic electromagnetic induction heating unit is in operation and multiple local heating units are in operation.

[0041] In mode 3, at least one transverse magnetic electromagnetic induction heating unit, at least one longitudinal magnetic electromagnetic induction heating unit, and multiple local heating units operate. When a local heating unit operates, if the upper and lower front temperature probes 6 and the upper and lower rear temperature probes 7 detect different surface temperatures on the slab, it will locate the position with the lower temperature and transmit the data to an externally connected computer processing program. The computer processing program then controls the geared motor to rotate forward and backward, which in turn drives the drive disc to rotate forward and backward, thereby causing the two upper and lower driven gear turntables 9 to rotate forward and backward. The upper and lower screws 5 on the upper and lower sides will also rotate forward and backward. The forward and backward rotation of the upper and lower screws 5 will drive the upper and lower sliders 3 to move left and right, which will drive the upper and lower heating heads 4 to move forward and backward, moving them to the relatively lower temperature position, and heating the lower temperature position of the slab.

[0042] refer to Figure 3 As shown: The combined application of multiple local electromagnetic induction heating units enables temperature compensation heating of multiple different low-temperature regions of the heated slab, thereby achieving the final temperature uniformity of the heated slab.

[0043] refer to Figure 1 As shown: In the combined slab heating device system, the power weight (number of units × power per unit) of the longitudinal magnetic electromagnetic induction heating unit increases with the increase of the thickness of the heated slab, while the power weight (number of units × power per unit) of the transverse magnetic electromagnetic induction heating unit decreases with the increase of the thickness of the heated slab. See the table below for details:

[0044] The upper and lower front temperature probes 6 and the upper and lower rear temperature probes 7 in the local heating unit detect the temperature of the heated slab 8 before and after the upper and lower heating heads 4, and send the temperature signals to the control system to realize the heating energy control of the heating head 4 and realize the temperature control of local heating.

[0045] refer to Figure 1As shown: The continuous casting and rolling production line uses a combined slab heating device system, the components of which include, but are not limited to: a slab continuous casting machine, a roughing mill, a head cutter, a combined slab heating device system, a descaling device, a finishing mill, a flying shear device, and a coiling device. The slab continuous casting machine, roughing mill, head cutter, descaling device, finishing mill, flying shear device, and coiling device are arranged sequentially upstream and downstream. The combined slab heating device system may be located only between the continuous casting machine and the roughing mill, or only between the roughing mill and the descaling device, or both of the above locations are provided simultaneously.

[0046] Specifically: The slab continuous casting machine will use existing equipment on the market, and no specific restrictions will be made here; The roughing mill reduces the thickness of the slab. The roughing mill uses existing equipment on the market and is not specifically limited here. The descaling device can be the descaling machine disclosed in the patent with publication number CN201516448U, or any fine descaling machine that can achieve fine rolling descaling, without any specific limitation here; Finishing mills can roll intermediate billets into strip steel that meets the required specifications. In practical applications, multiple finishing mills are set up. Generally, 4 to 6 finishing mills are set up. The number can be flexibly adjusted according to the effect. The finishing mills use existing equipment on the market and no specific limit is made here. The flying shear device can be the pendulum flying shear cutting mechanism provided by the patent with publication number CN205166018U, or other pendulum shears, which are not specifically limited here.

[0047] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed in this application.

Claims

1. A combined slab heating device system, characterized in that: The combined slab heating device system includes a transverse magnetic electromagnetic induction heating unit, a longitudinal magnetic electromagnetic induction heating unit, and a local heating unit. The induced magnetic field generated by the transverse magnetic electromagnetic induction heating unit passes transversely through the plane of the heated slab, the induced magnetic field generated by the longitudinal magnetic electromagnetic induction heating unit acts on the interior of the heated slab, the magnetic lines of force pass longitudinally through the heated slab, and the local heating unit is used to heat a local area of ​​the slab. The local heating unit is at least one, and is denoted as j1, j2, j3, j4...jn respectively. Each local heating unit includes a frame shell (1). The frame shell (1) has a rectangular window through which the slab to be heated passes. The frame shell (1) is provided with a local heating device. The local heating device is a pair of heating heads respectively set above and below the slab to be heated. It also includes a local heating device moving mechanism, which can realize the position movement of the local heating device to realize local heating of different positions of the slab. The heating head can be a transverse magnetic electromagnetic induction heating head, a longitudinal magnetic electromagnetic induction heating head, or a medium combustion heating head. The frame housing (1) includes upper and lower sliding grooves (2), upper and lower front temperature probes (6) and upper and lower rear temperature probes (7). The upper and lower sliding grooves (2) are equipped with upper and lower front temperature probes (6) and upper and lower rear temperature probes (7), and the upper and lower sliding grooves (2) are located above and below the heated slab, respectively. The upper and lower sliding grooves (2) are equipped with upper and lower sliders (3), and the upper and lower sliders (3) are connected to the upper and lower heating heads (4), respectively.

2. The combined slab heating device system according to claim 1, characterized in that: The longitudinal magnetic electromagnetic induction heating unit is equipped with a first coil (zx1) and a first terminal (zj1). The first coil (zx1) inside the longitudinal magnetic electromagnetic induction heating unit is a multi-turn coil wound with equal spacing between turns, and both ends of the coil are led out from the first terminal (zj1). The first coil (zx1) is equipped with a first protective shell on its outer side. The transverse magnetic electromagnetic induction heating unit is equipped with a second coil (hx1), a third coil (hx2), a second terminal (hj3), and a third terminal (hj4). The second coil (hx1) and the third coil (hx2) are arranged vertically opposite each other, and both of them are equipped with a second protective shell on their outer side. The second coil (hx1) and the third coil (hx2) are respectively connected to the second terminal (hj3) and the third terminal (hj4). The second coil (hx1) and the third coil (hx2) together generate a transverse magnetic field with the same direction that passes through the heated slab.

3. The combined slab heating device system according to claim 1, characterized in that: The upper and lower sliders (3) are respectively connected to upper and lower screws (5) through screw holes in their middle parts. The upper and lower sliders (3) are each provided with screw holes that match the upper and lower screws (5). The upper and lower screws (5) pass through the screw holes of the upper and lower sliders (3). One end of each screw is connected to a bearing fixed on one side of the frame housing (1), and the other end is connected to a bearing on the other side of the frame housing (1) and to an upper screw on the same side of the frame housing (1). The upper and lower driven gear turntables (9) are connected to each other. Both the upper and lower driven gear turntables (9) are meshed with the main drive gear turntable (10). The main drive gear turntable (10) is sleeved on the reducer drive shaft, and the input shaft of the reducer is connected to the motor shaft. The main drive gear turntable (10) drives the upper and lower driven gear turntables (9). Through the upper and lower screws (5) and the upper and lower sliders (3), the upper and lower heating heads (4) move laterally.

4. The combined slab heating device system according to claim 1, characterized in that: The combined slab heating device system includes at least two of the above three types of heating units, and the combination of the three types of heating units in the combined slab heating device system is as follows: Method 1: At least one transverse magnetic electromagnetic induction heating unit plus at least one downstream local heating unit; Method 2: At least one longitudinal magnetic electromagnetic induction heating unit plus at least one downstream local heating unit; Method 3: at least one transverse magnetic electromagnetic induction heating unit plus at least one longitudinal magnetic electromagnetic induction heating unit plus at least one downstream local heating unit, wherein the arrangement order of the at least one transverse magnetic electromagnetic induction heating unit and the at least one longitudinal magnetic electromagnetic induction heating unit is not limited.

5. The combined slab heating device system according to claim 4, characterized in that: In the combined slab heating device system, the power weight ratio of the longitudinal magnetic electromagnetic induction heating unit increases with the increase of the thickness of the heated slab, while the power weight ratio of the transverse magnetic electromagnetic induction heating unit decreases with the increase of the thickness of the heated slab. Here, the power weight refers to the number of units × the power of a single unit.

6. The combined slab heating device system according to claim 5, characterized in that: Multiple local heating units are combined to achieve temperature compensation heating of different low-temperature regions of the heated slab, thereby achieving the final temperature uniformity of the heated slab.

7. A combined slab heating device system according to claim 6, characterized in that: The upper and lower front temperature probes (6) and the upper and lower rear temperature probes (7) in the local heating unit detect the temperature of the heated slab (8) before and after the upper and lower heating heads (4), and send the temperature signal to the control system to realize the heating energy control of the heating head (4) and realize the temperature control of local heating.

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