Sealing apparatus for inlet/outlet of atmosphere heat treatment furnace
AssigneeNisshin Steel Co., Ltd.
InventorTeruhisa Nakamura
Life of this patent
Estimating the term…
Abstract
A sealing apparatus securely seals the inlet and outlet of an atmosphere heat treatment furnace. A pair of elastic rolls 26 and a pair of additional elastic rolls 26 hold a metal strip so as to seal the inlet and outlet of the atmosphere heat treatment furnace which continuously performs bright annealing of the metal strip in a combustible atmosphere gas including hydrogen gas. A pair of intermediate rolls are disposed between the elastic rolls and the additional elastic rolls. The outer peripheral surface of the elastic roll is sealed by a seal plate. By multi-stage sealing, the outside air can be shut off securely from the atmosphere of the furnace.
Claims21
A sealing apparatus for hermetically sealing the inlet and/or outlet of an atmosphere heat treatment furnace while holding a strip between a pair of elastic rolls, said apparatus comprising:
- a pair of additional elastic rolls for holding the strip outside said atmosphere heat treatment furnace and spaced from said pair of elastic rolls;
- a pair of intermediate rolls disposed between said pair of elastic rolls and said pair of additional elastic rolls;
- said pair of intermediate rolls contacting said pair of elastic rolls and said pair of additional elastic rolls over full lengths thereof in an axial direction thereof;
- and
- a space surrounded by all said rolls being formed under a condition that the strip is held between said pair of elastic rolls and said pair of additional elastic rolls.
The sealing apparatus for the inlet and/or outlet of an atmosphere heat treatment furnace of claim 11, wherein said atmosphere heat treatment furnace is filled with an atmospheric combustible gas including hydrogen gas retained under a pressure slightly higher than atmospheric pressure.
A sealing apparatus for hermetically sealing the inlet and/or outlet of an atmosphere heat treatment furnace while holding a strip between a pair of elastic rolls, said apparatus comprising:
- a pair of additional elastic rolls for holding the strip outside said atmosphere heat treatment furnace and spaced from said pair of elastic rolls;
- a pair of intermediate rolls disposed between said pair of elastic rolls and said pair of additional elastic rolls;
- said pair of intermediate rolls contacting said pair of elastic rolls and said pair of additional elastic rolls over full lengths thereof in an axial direction thereof;
- and
- a space surrounded by all said rolls being formed under a condition that the strip is held between said pair of elastic rolls and said pair of additional elastic rolls, and an interior of said atmosphere heat treatment furnace is maintained under a pressure lower than atmospheric pressure.
Dependencies are inferred from the claim text.