Power-losing tension eliminating method for large vertical type annealing furnace

Abstract

The invention discloses a power-losing tension eliminating method for a large vertical type annealing furnace. A plurality of furnace rollers for tensioning strip steel are arranged in the annealing furnace, and the furnace rollers are divided into fixed rollers and movable rollers capable of moving. In a power-on state, the movable rollers are controlled to be kept at a tensioning position for tensioning the strip steel; after power is lost, the movable rollers are unlocked, and the movable rollers move towards a loosening position for loosening the strip steel. According to the power-losingtension eliminating method for the large vertical type annealing furnace, by arranging the movable rollers, the movable rollers are loosened after power is lost, the movable rollers move towards the loosening position, the strip steel is loosened, and the tension of the strip steel can be eliminated during a power failure; and the strip steel in the furnace is compensated for, and the situation that the tension of the strip steel is too large during the power failure, transitional deformation and strip breakage happen can be avoided.

Description

technical field [0001] The invention relates to the field of iron and steel manufacturing, in particular to a method for losing power and reducing tension of a large vertical annealing furnace. Background technique [0002] During the strip steel production process, the strip steel continuous annealing line and galvanizing line must pass through the continuous annealing furnace. After the strip steel enters the furnace from the entrance, it continuously passes through furnace towers with various functions, and then exits from the exit. The temperature of the steel strip in the furnace is up to more than 800 degrees, and the length of the steel strip in the entire furnace reaches one thousand or even several thousand meters. Sometimes it is unavoidable to encounter unexpected power outages. Once the power is cut off, the furnace temperature and strip temperature will drop, resulting in cold shrinkage. The cold shrinkage benefit of such a long strip steel is very serious, and ...

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Problems solved by technology

[0003] However, because there are many rollers in the furnace and the steel strip is very long, this little bit of slack steel strip cannot satisfy the cold shrinkage of such a long steel strip in the furnace. In addition, the furnace roller cannot rotate when the power is off. The friction resistance is very large, and it cannot compensate the strip steel deep in the furnace.

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