US 12,090,535 B2Granted

Heating device for the inductive heating of a flat steel strip in a hot rolling mill

AssigneePrimetals Technologies Austria GmbH

InventorsThomas Lengauer, Bernd Linzer, Michael Zahedi

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Abstract

A heating device and a method for the inductive heating of a flat steel strip in a hot rolling mill. The heating device is between two rolling trains of the hot rolling mill and the flat steel strip runs at a speed through the heating device in a transporting direction. The heating device includes: transverse-field modules arranged one after the other along the transporting direction of the flat steel strip; longitudinal-field modules arranged one after the other along the transporting direction of the flat steel strip and arranged before or after the transverse-field modules along the transporting direction; a first power supply supplying at least one transverse-field module with a first alternating voltage; and a second power supply supplying at least one longitudinal-field module with a second alternating voltage. The power supplies have a converter and an electrically connected capacitor bank with multiple capacitors connected in parallel.

Claims17

Dependent claims

A method for the inductive heating of a flat steel strip in a hot rolling mill by a heating device, wherein the heating device is arranged between two rolling trains of the hot rolling mill and the flat steel strip runs at a speed through the heating device in a transporting direction, comprising the method steps of:

heating the flat steel strip by a first module group with a plurality of transverse-field modules, which are arranged one after the other along the transporting direction;
and heating the flat steel strip by a second module group with a plurality of longitudinal-field modules, the second module group being arranged one after the other along the transporting direction and being arranged before or after the first module group along the transporting direction, and adjusting with a lift actuator a height position of at least one coil of at least one of the transverse-field modules;
wherein a power supply for supplying at least one transverse-field module or at least one longitudinal-field module has a converter, which is operated as a load-commutated converter;
and
wherein the frequency f of the generated alternating voltage is
f
=
1
2
⁢
π
⁢
L
Ges
⁢
C
Ges
,
where LGes indicates the total inductive load and CGes indicates the total capacitive load in the circuit.

16 more elements

A heating device for the inductive heating of a flat steel strip in a hot rolling mill, the heating device being arranged between two rolling trains of the hot rolling mill and the flat steel strip runs at a speed through the heating device in a transporting direction, the heating device comprising:

a first module group with a plurality of transverse-field modules arranged one after the other along the transporting direction of the flat steel strip;
a second module group with a plurality of longitudinal-field modules arranged one after the other along the transporting direction of the flat steel strip, the second module group being arranged before or after the first module group along the transporting direction;
a first power supply adapted to supply at least one transverse-field module with a first alternating voltage;
a second power supply adapted to supply at least one longitudinal-field module with a second alternating voltage;
and a lift actuator for changing the height position of at least one coil of a transverse-field module;
wherein the power supplies have in each case a converter and an electrically connected capacitor bank with multiple capacitors connected in parallel.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/599,088Filed 4 Mar 2020
Priority: AT A 50273/201929 Mar 2019
Published: US 2022/0193741 A123 Jun 2022
Granted: 17 Sep 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

B21B 45/004
Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with,…: heating…
B21B 1/026
For rolling heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging…:…
B21B 1/04
For rolling heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging…:…
C21D 1/42
Methods of heating: induction heating