Induction heating device for metal strip

Patent metadata

Field	Value
Publication number	US-2017290102-A1
Application number	US-201515508057-A
Country	US
Kind code	A1
Filing date	Sep 4, 2015
Priority date	Sep 5, 2014
Publication date	Oct 5, 2017
Grant date	—

Abstract

An induction heating device for a metal strip includes a first induction coil member and a second induction coil member provided in parallel with a metal strip across the metal strip that travels in a longitudinal direction, provided to protrude from the metal strip, and provided so as not to overlap each other in the traveling direction of the metal strip, and a magnetic core member provided between the first induction coil member and the second induction coil member, and provided to cover a large area of an end portion in the sheet width direction of the metal strip on the side of each of the first induction coil member and the second induction coil member, and cover a small area of the end at a center portion between the first induction coil member and the second induction coil member.

First claim

1 . An induction heating device for a metal strip, comprising:
an induction coil including:
a first induction coil member and a second induction coil member that are provided in parallel with a metal strip across the metal strip that travels in a longitudinal direction thereof, that are provided such that both ends of each of the first induction coil member and the second induction coil member protrude from the traveling metal strip in a sheet width direction of the traveling metal strip, and that are arranged such that vertical projection images thereof onto the traveling metal strip do not overlap each other in a traveling direction in which the metal strip travels;
a first electrical connector for electrically connecting one of both ends of the first induction coil member and one of both ends of the second induction coil member; and
a second electrical connector for electrically connecting another one of the both ends of the first induction coil member and another one of the both ends of the second induction coil member;
a first magnetic core including:
a first magnetic core member provided between the first induction coil member and the second induction coil member in the traveling direction, the first magnetic core member being provided on one of surface sides of the traveling metal strip and covering a large area of one end portion in the sheet width direction of the traveling metal strip, the large area being on a side of each of the first induction coil member and the second induction coil member, and covering a small area of the one end portion at a center portion between the first induction coil member and the second induction coil member; and
a second magnetic core member provided between the first induction coil member and the second induction coil member in the traveling direction, the second magnetic core member being provided on another one of the surface sides opposite from the one of the surface sides of the traveling metal strip and covering a large area of the one end portion in the sheet width direction of the traveling metal strip, the large area being on the side of each of the first induction coil member and the second induction coil member, and covering a small area of the one end portion at the center portion between the first induction coil member and the second induction coil member; and
a second magnetic core including:
a third magnetic core member provided between the first induction coil member and the second induction coil member in the traveling direction, the third magnetic core member being provided on the one of the surface sides of the traveling metal strip and covering a large area of another end portion opposite from the one end portion in the sheet width direction of the traveling metal strip, the large area being on the side of each of the first induction coil member and the second induction coil member, and covering a small area of the another end portion at the center portion between the first induction coil member and the second induction coil member; and
a fourth magnetic core member provided between the first induction coil member and the second induction coil member in the traveling direction, the fourth magnetic core member being provided on the another one of the surface sides of the traveling metal strip and covering a large area of the another end portion in the sheet width direction of the traveling metal strip, the large area being on the side of each of the first induction coil member and the second induction coil member, and covering a small area of the another end portion at the center portion between the first induction coil member and the second induction coil member.

2 . The induction heating device for a metal strip according to claim 1 , wherein
the first induction coil member is provided on the one of the surface sides of the traveling metal strip, and the second induction coil member is provided on the another one of the surface sides of the traveling metal strip.

3 . The induction heating device for a metal strip according to claim 1 , further comprising a second induction coil including:
a third induction coil member and a fourth induction coil member that are provided in parallel with the metal strip across the metal strip that travels in the longitudinal direction thereof, that are provided such that both ends of each of the third induction coil member and the fourth induction coil member protrude from the traveling metal strip in the sheet width direction of the traveling metal strip, and that are arranged such that vertical projection images thereof onto the traveling metal strip do not overlap each other in the traveling direction in which the metal strip travels;
a third electrical connector for electrically connecting one of both ends of the third induction coil member and one of both ends of the fourth induction coil member; and
a fourth electrical connector for electrically connecting another one of the both ends of the third induction coil member and another one of the both ends of the fourth induction coil member,
wherein vertical projection images of the first induction coil member and the third induction coil member onto the traveling metal strip overlap each other in the traveling direction in which the metal strip travels, and vertical projection images of the second induction coil member and the fourth induction coil member onto the traveling metal strip overlap each other in the traveling direction in which the metal strip travels, and wherein the first induction coil member and the second induction coil member are provided on the one of the surface sides of the traveling metal strip, and the third induction coil member and the fourth induction coil member are provided on the another one of the surface sides of the traveling metal strip.

4 . The induction heating device for a metal strip according to claim 1 , wherein
the first magnetic core member and the second magnetic core member each are divided into a same number of a plurality of members in the traveling direction, and the plurality of divided first magnetic core members and the plurality of divided second magnetic core members are arranged such that vertical projection images of the divided first magnetic core members and vertical projection images of the divided second magnetic core members onto the traveling metal strip respectively overlap each other in the traveling direction in which the metal strip travels, and the third magnetic core member and the fourth magnetic core member each are divided into a same number of a plurality of members in the traveling direction, and the plurality of divided third magnetic core members and the plurality of divided fourth magnetic core members are arranged such that vertical projection images of the divided third magnetic core members and vertical projection images of the divided fourth magnetic core members onto the traveling metal strip respectively overlap each other in the traveling direction in which the metal strip travels.

5 . The induction heating device for a metal strip according to claim 4 , further comprising: a moving mechanism configured to move each of the divided plurality of members of the first magnetic core member and the second magnetic core member, and each of the divided plurality of members of the third magnetic core member and the fourth magnetic core member in the sheet width direction of the traveling metal strip.

6 . The induction heating device for a metal strip according to claim 2 , further comprising:
a second induction coil having a structure identical to a structure of the induction coil; a third magnetic core having a structure identical to a structure of the first magnetic core; and a fourth magnetic core having a structure identical to a structure of the second magnetic core

Assignees

• Nippon Steel & Sumitomo Metal Corp

Inventors

• Hirota Yoshiaki
• Taira Masato

Classifications

• C21D1/00

  General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering · CPC title

• H05B6/36

  Coil arrangements · CPC title

• C21D1/42

  Induction heating · CPC title

• H05B6/365

  using supplementary conductive or ferromagnetic pieces · CPC title

• F27D2019/0037

  Quantity of electric current · CPC title