Enclosed planar electromagnetic heating device guided by E-shaped iron core

Abstract

The utility model relates to an E-shaped iron core guided closed type planar electromagnetic heating device, and relates to the technical field of electromagnetic heating, the E-shaped iron core guided closed type planar electromagnetic heating device comprises a fixed frame and a guide iron core, the guide iron core is located above the fixed frame, a heating area is reserved between the fixed frame and the guide iron core, a magnetic field assembly is fixedly arranged in the fixed frame, and the guide iron core is arranged in the magnetic field assembly. The magnetic field assembly is used for generating a plurality of first alternating magnetic fields and second alternating magnetic fields in a heating area, the first alternating magnetic fields and the second alternating magnetic fields are sequentially alternated in the length direction of the fixed frame, and magnetic lines of the first alternating magnetic fields and the second alternating magnetic fields are parallel to the height direction of the fixed frame and are opposite in direction; and the guide iron core is made of a magnetic conductive material and is used for changing the directions of magnetic lines of force of the first alternating magnetic field and the second alternating magnetic field. The heating device has the effects of reducing the heat loss degree and improving the energy efficiency when the metal strip is heated.

Description

Technical Field

[0001] This application relates to the field of electromagnetic heating technology, and in particular to a closed planar electromagnetic heating device guided by an E-type iron core. Background Technology

[0002] In modern industrial manufacturing, especially in applications involving the heat treatment of metallic materials, uniform heating is crucial for product quality. For example, in the continuous heat treatment of metal strips (strip metal materials), the uniformity of heating directly affects the quality and performance of the final product. Currently, commonly used continuous heating equipment mainly includes resistance furnaces, gas-fired furnaces, and electromagnetic heating devices.

[0003] Traditional electromagnetic heating devices typically employ an open structure, utilizing the magnetic effect of electric current to generate an alternating planar magnetic field. The metal strip is placed within this planar magnetic field, where the magnetic field lines are perpendicular to the surface of the metal strip and continuously alternating, thereby heating the metal strip.

[0004] However, although traditional open-structure electromagnetic heating devices can achieve basic heating functions, the magnetic field lines are prone to divergence, which increases energy consumption, leads to heat loss, reduces energy efficiency, and affects the heating effect. Utility Model Content

[0005] In order to reduce heat loss, improve energy efficiency, and ensure heating effect when heating metal strip, this application provides a closed planar electromagnetic heating device guided by an E-type iron core.

[0006] The closed planar electromagnetic heating device guided by an E-type iron core provided in this application adopts the following technical solution:

[0007] An E-type core-guided enclosed planar electromagnetic heating device includes a fixed frame and a guiding core. The guiding core is located above the fixed frame, and a heating area is left between the fixed frame and the guiding core. A magnetic field assembly is fixedly installed inside the fixed frame. The magnetic field assembly is used to generate several first alternating magnetic fields and second alternating magnetic fields within the heating area. The first and second alternating magnetic fields alternate sequentially along the length of the fixed frame. The magnetic field lines of the first and second alternating magnetic fields are parallel to the height direction of the fixed frame and are in opposite directions. The guiding core is made of a magnetically conductive material and is used to change the direction of the magnetic field lines of the first and second alternating magnetic fields, converging the magnetic field lines of the first and second alternating magnetic fields within the heating area.

[0008] By adopting the above technical solution, when the metal strip moves along the length of the fixed frame between the magnetic field assembly and the guide core, the magnetic lines of force of the first and second alternating magnetic fields generated by the magnetic field assembly act on the surface of the metal strip and continuously change the direction of the magnetic lines of force, thus heating the metal strip. At any given moment, if the magnetic lines of force of the first alternating magnetic field point towards the guide core, the magnetic lines of force of the second alternating magnetic field point away from it. After penetrating the metal strip, the magnetic lines of force of the first alternating magnetic field are guided by the guide core, changing their direction. Within the guide core, the magnetic lines of force of the first alternating magnetic field point away from the original position of the first alternating magnetic field, that is, towards the adjacent second alternating magnetic field. The magnetic field lines of the second alternating magnetic field point away from the guiding iron core. The magnetic field lines of the first alternating magnetic field inside the guiding iron core are directed away from the guiding iron core, causing the magnetic field lines of the first alternating magnetic field to reorient towards the metal strip. This concentrates the magnetic field lines of the first and second alternating magnetic fields within the heating area, reducing the divergence of the magnetic field lines, making the heating more concentrated and efficient, thereby reducing heat loss, improving energy efficiency, and ensuring the heating effect.

[0009] Preferably, the guiding core is a straight strip, and both the first alternating magnetic field and the second alternating magnetic field are perpendicular to the guiding core.

[0010] By adopting the above technical solution, the guide core set in the straight bar plate is convenient to be aligned with and parallel to the fixed frame to form a narrow heating space. On the other hand, the guide core of the straight bar plate facilitates the conduction of the magnetic lines of the first alternating magnetic field and the second alternating magnetic field in a direction perpendicular to the original position. The conduction distance of the magnetic lines of force in the guide core is minimized, so that the magnetic lines of force of the first alternating magnetic field and the second alternating magnetic field can more easily influence each other, so as to better guide the magnetic lines of force, reduce the scattering of magnetic lines of force, and improve the concentration of the magnetic field.

[0011] Preferably, the material of the guide core is iron.

[0012] By adopting the above technical solution, iron has high magnetic permeability, which can effectively guide the alternating magnetic field lines generated by the magnetic field component and enclose the magnetic field lines in the heating area. At the same time, iron material has low cost and is easy to process and manufacture.

[0013] Preferably, the magnetic field assembly includes several core groups arranged sequentially along the length of the fixed frame. Each core group includes a coil and an E-shaped core. The E-shaped core has two grooves on one side facing the height of the fixed frame. The two grooves are parallel to the width of the fixed frame. A wire on one side of the coil passes through one groove along the width of the fixed frame, and a wire on the other side of the coil passes through the other groove along the width of the fixed frame. The coil is used to connect to alternating current. The E-shaped core is composed of several E-shaped core units arranged along the width of the fixed frame. All core groups are fixedly installed inside the fixed frame, and the grooves are located on the side of the E-shaped core facing away from the bottom surface of the fixed frame.

[0014] By adopting the above technical solution, when the coil is connected to AC power, an alternating magnetic field will be generated inside and outside the coil. At this time, the E-shaped iron cores on both sides of the groove guide the magnetic lines of the alternating magnetic field. If the E-shaped iron core between the two grooves guides the first alternating magnetic field, then the E-shaped iron core outside the two grooves guides the second alternating magnetic field. Since the magnetic lines of force inside and outside the coil are in opposite directions, a first alternating magnetic field and a second alternating magnetic field with opposite directions of magnetic lines of force are formed.

[0015] Preferably, the E-type iron core unit includes two U-shaped iron cores, which are arranged side by side along the length of the fixed frame. Each U-shaped iron core includes a connecting part and two iron core columns, one of which is perpendicular to one end of the connecting part and the other is perpendicular to the other end of the connecting part. The two iron core columns located in the center of the E-type iron core unit together form a central column, and the two iron core columns located on both sides of the E-type iron core unit each serve as side columns. The central column is located in the center of the coil.

[0016] By adopting the above technical solution, a total of four core posts are formed in the two parallel U-shaped cores. The two core posts in the middle together constitute the central post of the E-shaped core unit, while the two core posts on both sides serve as the side posts of the E-shaped core unit. This combination of U-shaped cores is simple and easy to operate, and can conveniently construct E-shaped core units. The central post consists of two core posts, and the side posts consist of a single core post. The core groups are also arranged sequentially along the length of the fixed frame. Viewed along the length of the fixed frame, this can be seen as a sequence of one central post and two side posts, or more specifically, each pair of core groups is spaced apart along the length of the fixed frame. The magnetic field line densities of the first or second alternating magnetic field guided by the central post and side posts are similar, ensuring that the magnetic field strengths of the first and second alternating magnetic fields are consistent.

[0017] Preferably, a support frame is fixedly mounted on the fixed frame, and a rotating shaft is rotatably mounted on the top of the support frame. The axis of the rotating shaft is parallel to the length direction of the fixed frame, and the side of the guide core is fixedly connected to the rotating shaft.

[0018] By adopting the above technical solution, the side of the guide iron core is fixedly connected to the rotating shaft, so that the guide iron core can rotate around the rotating shaft, making it convenient to open the heating area between the guide iron core and the magnetic field assembly for maintenance of the iron core assembly.

[0019] Preferably, the device also includes a motor for driving the rotating shaft to rotate.

[0020] By adopting the above technical solution, the motor can easily achieve precise control of the rotation of the rotating shaft without manual operation, which improves the automation level and working efficiency of the device, and minimizes the need for personnel to approach the high-temperature heating environment. Maintenance of the iron core assembly can be carried out after the heat is dissipated.

[0021] Preferably, a drive pulley is coaxially fixed on the drive shaft of the motor, and a driven pulley is coaxially fixed on the rotating shaft. A transmission belt is provided between the drive pulley and the driven pulley, with one end of the transmission belt sleeved on the drive pulley and the other end of the transmission belt sleeved on the driven pulley.

[0022] By adopting the above technical solution, when the drive shaft of the motor rotates, the driving pulley rotates accordingly, and drives the driven pulley to rotate through the transmission belt, thereby driving the rotating shaft to rotate. This enables the motor to drive the rotating shaft from a distance, allowing the motor to stay away from the magnetic field components and preventing strong magnetic fields from interfering with the electrodes.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. By setting up a magnetic field component and a guiding iron core, the magnetic lines of force of the magnetic field component are guided by the guiding iron core on the other side of the metal strip, and the alternating magnetic lines of force are gathered in the magnetic field component and the guiding iron core to form a closed loop, thereby reducing the loss of unidirectional E-type iron core magnetic lines of force.

[0025] 2. By setting up multiple E-type iron core units and coils arranged in rows along the X and Y axes, a uniform large-area magnetic field is formed, so that the magnetic field strength remains relatively consistent in the heating area, and the metal strip is heated comprehensively and uniformly.

[0026] 3. By setting up an active pulley, a driven pulley, a transmission belt, and a motor, it is easy to control the rotating shaft. When the metal strip is not heated, the guide iron core is no longer directly facing the magnetic field component. At the same time, the motor can drive the rotating shaft from a distance, minimizing the interference of strong magnetic fields on the motor. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of an E-type iron core-guided enclosed planar electromagnetic heating device provided in the embodiments of this application.

[0028] Figure 2 This is a schematic diagram of the magnetic field component structure provided in the embodiments of this application.

[0029] Figure 3 This is a schematic diagram of a single E-type iron core unit structure in an embodiment of this application.

[0030] Figure 4 This is a schematic diagram showing the direction of the magnetic field lines of the first alternating magnetic field and the second alternating magnetic field in an embodiment of this application.

[0031] Explanation of reference numerals in the attached drawings: 1. Fixed frame; 2. Guide core; 3. Core assembly; 31. Coil; 32. E-type core unit; 321. Central column; 322. Side column; 323. Groove; 33. U-shaped core; 331. Connecting part; 332. Core column; 4. Support frame; 41. Rotating shaft; 411. Driven pulley; 5. Motor; 51. Driving pulley; 52. Transmission belt; 6. First alternating magnetic field; 7. Second alternating magnetic field. Detailed Implementation

[0032] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0033] Example 1:

[0034] This application discloses a closed-type planar electromagnetic heating device guided by an E-type iron core. (Refer to...) Figure 1 It includes a fixed frame 1 and a guide iron core 2. The guide iron core 2 is located above the fixed frame 1, and a heating area is left between the fixed frame 1 and the guide iron core 2.

[0035] Reference Figures 1 to 4 A magnetic field assembly is fixedly installed within the fixed frame 1. This assembly generates several first alternating magnetic fields 6 and second alternating magnetic fields 7 within the heating area. The first alternating magnetic fields 6 and 7 alternate sequentially along the length of the fixed frame 1, with their magnetic field lines parallel to the height of the fixed frame 1 and in opposite directions. A guiding core 2, made of magnetically conductive material, is used to change the direction of the magnetic field lines of the first alternating magnetic fields 6 and 7, concentrating them within the heating area. When the metal strip moves along the length of the fixed frame 1 between the magnetic field assembly and the guiding core 2, the continuously alternating magnetic field lines of the first alternating magnetic fields 6 and 7 heat the metal strip under the influence of electromagnetic induction.

[0036] Referring to 1, the guide core 2 is specifically a straight strip made of iron, and the first alternating magnetic field 6 and the second alternating magnetic field 7 are both perpendicular to the guide core 2.

[0037] Reference Figures 1 to 4At any given moment, if the magnetic field lines of the first alternating magnetic field 6 point towards the guiding iron core 2, then the magnetic field lines of the second alternating magnetic field 7 point away from it. After penetrating the metal strip, the magnetic field lines of the first alternating magnetic field 6 are guided by the guiding iron core 2, changing their direction. Within the guiding iron core 2, the magnetic field lines of the first alternating magnetic field 6 point away from their original position, i.e., towards the adjacent second alternating magnetic field 7. Meanwhile, the magnetic field lines of the second alternating magnetic field 7 point away from the guiding iron core 2. The second alternating magnetic field 7 then guides the magnetic field lines of the first alternating magnetic field 6 within the guiding iron core 2, causing the magnetic field lines of the first alternating magnetic field 6 to reorient towards the metal strip. This converging of the magnetic field lines of the first alternating magnetic field 6 and the second alternating magnetic field 7 within the heating area reduces the divergence of the magnetic field lines, making the heating more concentrated and efficient, thereby reducing heat loss, improving energy efficiency, and ensuring the heating effect.

[0038] To facilitate the generation of a first alternating magnetic field 6 and a second alternating magnetic field 7 with parallel and opposite magnetic field lines, referring to the figure, the magnetic field assembly includes several iron core groups 3 arranged sequentially along the length of the fixed frame 1. Each iron core group 3 includes a coil 31 and an E-shaped iron core. Two grooves 323 are formed on one side of the E-shaped iron core facing the height direction of the fixed frame 1. The two grooves 323 are formed parallel to the width direction of the fixed frame 1. The wire on one side of the coil 31 passes through one groove 323 along the width direction of the fixed frame 1, and the wire on the other side of the coil 31 passes through the other groove 323 along the width direction of the fixed frame 1.

[0039] Coil 31 is used to connect to AC power, which can be provided by an IGBT power supply. The E-type iron core consists of several E-type iron core units 32 arranged along the width direction of the fixed frame 1. All iron core units 3 are fixedly installed in the fixed frame 1, and the groove 323 is located on the side of the E-type iron core facing away from the bottom surface of the fixed frame 1. Coil 31 is wound using hollow high-purity oxygen-free copper tube. Coil 31 is wound along the elongated O-shaped direction. The specifications and number of turns of coil 31 are determined according to the required magnetic field strength. Coil 31 and the E-type iron core units are bonded and fixed with epoxy resin or a material with the same properties.

[0040] To ensure that the magnetic field line densities of the first alternating magnetic field 6 and the second alternating magnetic field 7 are consistent, refer to Figure 2 and Figure 3The E-type iron core unit 32 includes two U-shaped iron cores 33, which are arranged side by side along the length of the fixed frame 1. Each U-shaped iron core 33 includes a connecting part 331 and two iron core posts 332, one of which is perpendicular to one end of the connecting part 331, and the other is perpendicular to the other end of the connecting part 331. The two iron core posts 332 located in the center of the E-type iron core unit 32 together form a central post 321, and the two iron core posts 332 located on both sides of the E-type iron core unit 32 each serve as side posts 322. The central post 321 is located in the center of the coil 31. The central post 321 is used to guide the first alternating magnetic field 6, and the side posts 322 are used to guide the second alternating magnetic field 7.

[0041] Reference Figure 2 and Figure 3 The central column 321 consists of two iron core columns 332, and the side columns 322 consist of a single iron core column 332. The iron core groups 3 are also arranged sequentially along the length of the fixed frame 1. Along the length of the fixed frame 1, one central column 321 and two side columns 322 are spaced apart sequentially, which can be further considered as two iron core groups 3 forming a group spaced apart along the length of the fixed frame 1. Therefore, the magnetic field line densities of the first alternating magnetic field 6 guided by the central column 321 and the second alternating magnetic field 7 guided by the side columns 322 are consistent.

[0042] The implementation principle of the enclosed planar electromagnetic heating device guided by an E-type iron core according to an embodiment of this application is as follows: Alternating current is supplied to the coil 31, generating alternating magnetic fields with opposite directions inside and outside the coil 31. The central column 321 guides the first alternating magnetic field 6 inside the coil 31, and the side column 322 guides the first alternating magnetic field 6 outside the coil 31. The metal strip moves along the length of the fixed frame 1 between the fixed frame 1 and the guiding iron core 2. The alternating magnetic lines of force of the first alternating magnetic field 6 and the second alternating magnetic field 7 continuously heat the metal strip. At the same time, after the first alternating magnetic field 6 passes through the metal strip, it is guided by the guiding iron core 2 and propagates towards the second alternating magnetic field 7 within the guiding iron core 2. Finally, the magnetic lines of force of the first alternating magnetic field 6 are guided by the second alternating magnetic field 7 and return to the direction of the metal strip. In this way, the magnetic lines of force of the alternating magnetic field are concentrated within the heating area, thereby reducing heat loss, improving energy efficiency, and ensuring a good heating effect when heating the metal strip.

[0043] Example 2:

[0044] Based on Example 1, to facilitate opening the narrow heating area between the guide core 2 and the magnetic field assembly, refer to... Figure 1 A support frame 4 is fixedly installed on the fixed frame 1. A rotating shaft 41 is rotatably installed on the top of the support frame 4. The axis of the rotating shaft 41 is parallel to the length direction of the fixed frame 1. The side of the guide core 2 is fixedly connected to the rotating shaft 41.

[0045] Reference Figure 1This application also includes a motor 5 for driving the rotating shaft 41 to rotate, the motor 5 being fixed away from the magnetic field component. A driving pulley 51 is fixedly mounted on the drive shaft of the motor 5, and a driven pulley 411 is coaxially fixed on the rotating shaft 41. A transmission belt 52 is provided between the driving pulley 51 and the driven pulley 411, with one end of the transmission belt 52 sleeved on the driving pulley 51 and the other end of the transmission belt 52 sleeved on the driven pulley 411.

[0046] Reference Figure 1 When the narrow heating area between the guide core 2 and the magnetic field assembly is opened, the motor 5 is started, driving the drive pulley 51 to rotate, which in turn drives the driven pulley 411 to rotate via the transmission belt 52. This, in turn, drives the rotating shaft 41 to rotate, causing the guide core 2 to rotate around the rotating shaft 41. The heating area is thus opened, facilitating the loading and unloading of metal strips, equipment maintenance, and repair. When it is necessary to close the heating area, the motor 5 is started in reverse to reset the guide core 2.

[0047] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A closed-type planar electromagnetic heating device guided by an E-type iron core, characterized in that: The device includes a fixed frame (1) and a guide core (2). The guide core (2) is located above the fixed frame (1). A heating area is left between the fixed frame (1) and the guide core (2). A magnetic field assembly is fixedly installed inside the fixed frame (1). The magnetic field assembly is used to generate several first alternating magnetic fields (6) and second alternating magnetic fields (7) in the heating area. The first alternating magnetic fields (6) and second alternating magnetic fields (7) alternate sequentially along the length direction of the fixed frame (1). The magnetic lines of the first alternating magnetic fields (6) and second alternating magnetic fields (7) are parallel to the height direction of the fixed frame (1) and in opposite directions. The guide core (2) is made of a magnetically conductive material. The guide core (2) is used to change the direction of the magnetic lines of the first alternating magnetic fields (6) and second alternating magnetic fields (7) and to concentrate the magnetic lines of the first alternating magnetic fields (6) and second alternating magnetic fields (7) in the heating area.

2. The enclosed planar electromagnetic heating device guided by an E-type iron core according to claim 1, characterized in that: The guide core (2) is a straight strip, and the first alternating magnetic field (6) and the second alternating magnetic field (7) are both perpendicular to the guide core (2).

3. The enclosed planar electromagnetic heating device guided by an E-type iron core according to claim 1, characterized in that: The material of the guide core (2) is iron.

4. The enclosed planar electromagnetic heating device guided by an E-type iron core according to claim 1, characterized in that: The magnetic field assembly includes several core groups (3) arranged sequentially along the length of the fixed frame (1). Each core group (3) includes a coil (31) and an E-shaped core. The E-shaped core has two grooves (323) on one side facing the height of the fixed frame (1). The two grooves (323) are opened in a direction parallel to the width of the fixed frame (1). The wire on one side of the coil (31) passes through one groove (323) along the width of the fixed frame (1), and the wire on the other side of the coil (31) passes through the other groove (323) along the width of the fixed frame (1). The coil (31) is used to connect to alternating current. The E-shaped core is composed of several E-shaped core units (32) arranged along the width of the fixed frame (1). All the core groups (3) are fixedly installed in the fixed frame (1). The grooves (323) are located on the side of the E-shaped core away from the bottom surface of the fixed frame (1).

5. The enclosed planar electromagnetic heating device guided by an E-type iron core according to claim 4, characterized in that: The E-type iron core unit (32) includes two U-type iron cores (33), which are arranged side by side along the length of the fixed frame (1). Each U-type iron core (33) includes a connecting part (331) and two iron core columns (332), one of which is perpendicular to one end of the connecting part (331) and the other is perpendicular to the other end of the connecting part (331). The two iron core columns (332) located in the center of the E-type iron core unit (32) together form a central column (321), and the two iron core columns (332) located on both sides of the E-type iron core unit (32) each serve as a side column (322). The central column (321) is located in the center of the coil (31).

6. The enclosed planar electromagnetic heating device guided by an E-type iron core according to claim 1, characterized in that: A support frame (4) is fixedly installed on the fixed frame (1). A rotating shaft (41) is rotatably installed on the top of the support frame (4). The axis of the rotating shaft (41) is parallel to the length direction of the fixed frame (1). The side of the guide core (2) is fixedly connected to the rotating shaft (41).

7. The enclosed planar electromagnetic heating device guided by an E-type iron core according to claim 6, characterized in that: It also includes a motor (5) for driving the rotating shaft (41) to rotate.

8. The enclosed planar electromagnetic heating device guided by an E-type iron core according to claim 7, characterized in that: A drive pulley (51) is coaxially fixed on the drive shaft of the motor (5), and a driven pulley (411) is coaxially fixed on the rotating shaft (41). A transmission belt (52) is provided between the drive pulley (51) and the driven pulley (411). One end of the transmission belt (52) is sleeved on the drive pulley (51), and the other end of the transmission belt (52) is sleeved on the driven pulley (411).

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