A rof furnace column

Abstract

The invention discloses an ROF vertical column, which comprises a hollow column body. A contact disc is arranged at the top of the hollow column body, and a plurality of reinforcing ribs are arrangedbetween the bottom of the contact disc and the side wall of the hollow column body; the outer diameter of the contact disc is larger than that of the hollow column body; the top of the contact disc isprovided with a plurality of grooves at intervals in the circumferential direction, and provided with a plurality of connecting grooves at intervals in the radial direction; one circle exists in thesame circumference, the multiple circles are formed in the top of the contact disc, and the two or more grooves are formed in each circle; and each connecting groove communicates with the grooves in the corresponding passage. Through the contact disc, the contact area of the vertical column and a furnace bottom plate is increased greatly; under the same plate flipping period, the deformation of the furnace bottom plate is decreased to be 4-5 mm; under the same deformation, the plate flipping period is prolonged to be 66 days; the rate of defects such as silicon steel coil buckling and slide marks is decreased to be 2% from 3%; the quality of a silicon steel coil is effectively improved, and the operation intensity is lowered; and protection gas circulates through the connecting grooves andthe grooves, thus can be subjected to heat exchange better, and is heated more evenly.

Description

technical field [0001] The invention relates to a column used for supporting the bottom plate of the furnace in an annular annealing furnace. Background technique [0002] The ROF furnace (ring annealing furnace) column is placed on the hearth in the ROF furnace to support the furnace floor carrying the silicon steel coils and an important equipment for high-temperature annealing of the silicon steel coils. The column currently used is a hollow cylinder, which is the original structure when the ROF furnace was introduced. [0003] The furnace floor carrying the silicon steel coil is annealed at a high temperature in the ROF furnace. Under the action of high temperature, the furnace floor is deformed by gravity. The deformation of the furnace floor is the main reason for the defects such as buckling and slip marks on the edge of the silicon steel coil. Due to the structure of the existing column, the contact area between the column and the furnace floor is small, and the sup...

AI Technical Summary

Problems solved by technology

Due to the structure of the existing column, the contact area between the column and the furnace floor is small, and the support for the furnace floor is limited, so the furnace floor must be turned over frequently to reduce the possibility of defects in the silicon steel coil.

[0004] At present, domestic and foreign research mainly studies the structure, shape, material and other aspects of the furnace floor to improve the performance of the furnace floor, and has achieved certain results in solving the radial cracks of the furnace floor, but it has not been fundamentally solved. The problem of silicon steel coil defects due to the deformation of the furnace floor

Chinese patent "Backing plate of furnace floor in annealing furnace", authorized announcement number CN 2394174Y, authorized announcement date August 30, 2000, proposes a circular metal plate with a thickness of 20-60 mm on the furnace floor, Alleviate the influence of the deformation of the furnace floor on the stamping and side waves of the steel coil, and homogenize the compressive stress of the steel coil on the furnace floor. This method is equivalent to increasing the thickness of the furnace floor, which can alleviate the deformation of the furnace floor to a certain extent, but There is still the problem of deformation in the thickness direction caused by the small stress area between the furnace floor and the pillars

However, in this solution, the limited column is difficult to install and lift, and secondly, it is too bulky, the stress is concentrated, and the strength of the column itself is difficult to maintain at high temperature

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