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CN-117837270-B - Transverse induction heating device

CN117837270BCN 117837270 BCN117837270 BCN 117837270BCN-117837270-B

Abstract

The present invention relates to a transverse induction heating device, wherein coils (230, 330) are respectively arranged on the front surface side and the back surface side of a scheduled conveying surface (CP). A main core (211, 311), an edge core (212, 213, 312, 313), and a bridge core (220 a, 220b, 320a, 330 b) are arranged for the coils (230, 330). Bridge cores (220 a, 220b, 320a, 330 b) are disposed on the back sides of the main cores (211, 311) and the edge cores (212, 213, 312, 313). The main cores (211, 311) and the edge cores (212, 213, 312, 313) can be magnetically coupled by bridge cores (220 a, 220b, 320a, 320 b).

Inventors

  • UMEZU KENJI
  • UEKI TSUTOMU

Assignees

  • 日本制铁株式会社

Dates

Publication Date
20260505
Application Date
20220901
Priority Date
20210901

Claims (8)

  1. 1. An induction heating apparatus of a lateral type, comprising: a pair of coils disposed at least one on each of the front and back surfaces of the predetermined surface so that an alternating magnetic field generated by the application of alternating currents having the same orientation intersects the predetermined surface, and A core, a group is configured for each coil constituting the pair of coils, For a group of cores of each coil configuration, a plurality of partial cores are provided in a state of being spaced apart from each other in a width direction, The width direction is a direction perpendicular to a conveying direction of the conductor plate and an opposing direction of the coil, The partial cores each have a main body portion and a central leg portion, The main body portion is provided on the back surface side of the coil so as to extend in the conveying direction from a region on the upstream side of the conveying direction with respect to the coil to a region on the downstream side of the conveying direction with respect to the coil, The back side is the opposite side to the side where the conveyance scheduled surface exists, The central leg portion is provided so as to extend from the main body portion in the direction of the conveyance scheduled surface so as to pass through the hollow portion of the coil, In an induction heating device of the transverse mode, The set of cores has at least one bridge core magnetically couplable with at least two of the partial cores, The bridge core is disposed on the back side of the partial core.
  2. 2. A transverse mode induction heating apparatus as claimed in claim 1, wherein, The partial cores can each be magnetically coupled to at least one of the bridge cores.
  3. 3. A transverse mode induction heating apparatus as claimed in claim 1 or 2, characterized in that, All of the partial cores included in the set of cores are magnetically coupled via the bridge cores.
  4. 4. A transverse mode induction heating apparatus as claimed in claim 1 or 2, characterized in that, The set of cores each have a plurality of the bridge cores, The bridge cores are arranged with a space therebetween in the width direction.
  5. 5. A transverse mode induction heating apparatus as claimed in claim 4, wherein, The set of cores each have two of the bridge cores, The two bridge cores are arranged on both sides in the width direction with a space therebetween, At least a part of each of the partial cores coincides with one of the bridge cores when viewed from opposite directions of the coils.
  6. 6. A transverse mode induction heating apparatus as claimed in claim 1 or 2, characterized in that, The number of the bridge cores respectively provided for the one set of cores is 1.
  7. 7. A transverse mode induction heating apparatus as claimed in claim 1 or 2, characterized in that, In the set of cores, the partial core is a different core than the bridge core.
  8. 8. A transverse mode induction heating apparatus as claimed in claim 1 or 2, characterized in that, In the set of cores, at least one of the plurality of partial cores is a core integral with at least one of the bridge cores.

Description

Transverse induction heating device Technical Field The present application relates to a transverse (transition) induction heating apparatus, and more particularly, to an induction heating apparatus which is suitable for induction heating a conductive plate to be heated by intersecting an alternating magnetic field with the plate surface of the conductive plate. The present application is based on Japanese patent application No. 2021-142294, filed on 1/9/2021, and claims priority, the contents of which are incorporated herein in their entirety. Background An induction heating device is used to continuously heat a conductive plate such as a steel strip. The induction heating device applies an alternating magnetic field generated by a coil to the conductor plate. Then, eddy currents are induced in the conductor plate by electromagnetic induction. The conductor plate is heated by joule heat based on the eddy current. As the induction heating device, a solenoid (solenoid) -type induction heating device is available. The induction heating device of the solenoid type applies an alternating magnetic field substantially in parallel along the longitudinal direction of a conductor plate disposed inside a solenoid coil. When the thickness of the conductor plate to be heated is reduced (for example, when the thickness of the conductor plate is 1mm or less), there is a possibility that the conductor plate cannot be heated to a desired temperature even if the frequency of the alternating magnetic field is increased in the solenoid-type induction heating apparatus. As an induction heating apparatus capable of easily performing induction heating on a thin conductor plate, there is a transverse induction heating apparatus. The lateral induction heating device includes, for example, a pair of coils, and at least one of the coils is disposed on each of the front surface side and the back surface side of the predetermined surface for conveying the conductor plate conveyed in the horizontal direction. The coils constituting the pair of coils are arranged so that an alternating magnetic field generated by the energization of alternating currents which are oriented toward each other intersects a predetermined surface of the conductor plate. In a general transverse induction heating apparatus, eddy currents are concentrated at the widthwise ends of the conductor plate. Therefore, the current density at the end in the width direction of the conductor plate increases. Then, the end portion of the conductor plate in the width direction may become overheated. The width direction is a direction perpendicular to the conveyance direction of the conductor plate and the opposing direction of the coil. In the following description, the end portion in the width direction of the conductor plate is referred to as an edge portion as necessary. To solve such a problem, patent document 1 discloses that a shield plate (shielding plate) movable in the width direction is disposed between the edge portion of the conductor plate and the magnetic pole. The shield plate is made of a non-magnetic metal material. In the technique, an alternating magnetic field generated by the coil is shielded by the shielding plate, thereby suppressing the temperature distribution in the width direction of the conductor from becoming uneven. Patent document 2 discloses that a secondary coil for generating a magnetic field that cancels an alternating magnetic field generated by a coil for heating a conductor plate is disposed between an edge portion of the conductor plate and a magnetic pole. In the technique described in patent document 2, the secondary coil is caused to generate a magnetic field that cancels the alternating magnetic field generated by the coil, thereby suppressing the temperature distribution in the width direction of the conductor from becoming uneven. Patent document 3 discloses forming a bulge in the original core. The bulge is disposed at a position facing the region where the temperature of both ends in the width direction is reduced, of the regions of the conductor plate. In the technique described in patent document 3, the temperature distribution in the width direction of the conductor is suppressed from becoming uneven by the bulge portion formed in the original core. Patent document 4 discloses a technique of forming a coil using a first J-shaped conductor32 (1 st J-shaped conductor 32) and a second J-shaped conductor34 (2 nd J-shaped conductor 34). In the technique described in patent document 4, the first J-shaped conductor32 (1 st J-shaped conductor 32) is moved in the width direction with respect to the second J-shaped conductor34 (2 nd J-shaped conductor 34), whereby the length in the width direction of the region between the first J-shaped conductor32 (1 st J-shaped conductor 32) and the second J-shaped conductor34 (2 nd J-shaped conductor 34) is changed. In the technique described in patent document 4, the length of the region between t