Cooling process curve control structure of mobile hot air circulation annealing furnace with full fiber hood

Abstract

The invention discloses a cooling process curve control structure of a full-fiber furnace cover mobile heated air circulation annealing furnace. The two sides of the top faces of a left furnace cover and a right furnace cover of the structure are provided with multiple first through holes. Multiple air outlet pipes are arranged in the first through holes. Two U-shaped pipes are arranged on the top faces of the left furnace cover and the right furnace cover and made communicated with the multiple air outlet pipes. Two air outlet valves and two air exhaust fans are sequentially arranged at the open ends of the two U-shaped pipes. The lower portions of the side faces of the left furnace cover and the right furnace cover are provided with multiple second through holes. Multiple air inlet pipes are arranged in the second through holes. A left square pipe and a right square pipe are arranged on the lower portions of the inner walls of the side faces of the left furnace cover and the right furnace cover and made communicated with the multiple air inlet pipes. Two baffles are provided with multiple third through holes at intervals and arranged in the left square pipe and the right square pipe. Bottom plates of the left square pipe and the right square pipe are provided with multiple fourth through holes. Multiple air inlet valves are arranged at pipe orifices of the multiple air inlet pipes and located outside the left furnace cover and the right furnace cover. According to the structure, the cooling rate can be accurately controlled according to the cooling process curve regulated by the heat sealing process, and the roller heat treatment quality is improved.

Description

technical field [0001] The invention relates to a cooling process curve control structure of a full-fiber furnace cover mobile hot air circulation annealing furnace. Background technique [0002] The main structure of the full-fiber hood mobile hot air circulation annealing furnace is that the left and right full-fiber hoods are opened and closed on the guide rails through rollers, and the hearth is located in the two hoods. The stabilizing rolls on the cold rolling line of the steel mill must perform a thermal sealing process after thermal spraying. The thermal sealing process performs a cooling process curve at 520 ° C for 2 hours and then cooling to ≤ 150 ° C at ≤ 50 ° C / h. [0003] The current stabilizer roll heat sealing process is performed in two ways: [0004] 1. The rollers are hung vertically in the well-type furnace for heating and cooling. The advantage is that the deformation of the rollers is small, but the rollers must be installed on a special hanger when ...

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Problems solved by technology

[0004] 1. The rollers are hung vertically in the well-type furnace for heating and cooling. The advantage is that the deformation of the rollers is small. However, when the rollers enter the furnace, they must be installed on a special hanger. When the hanger is lifted, the scale and dust will be scattered and pasted on the coated seal After the heat sealing process is completed, the roller surface must be wiped. If the roller surface is not wiped properly, the sprayed layer will be damaged, resulting in quality defects, and the dust generated when wiping the roller surface Pollution has a great impact on the health of operators; in addition, when implementing the cooling process curve, the furnace bottom cover must be manually opened to allow cold air to blow upwards from the bottom of the furnace to cool down. The opening of the bottom cover is small, and the cooling rate < 50°C / h, the opening of the bottom cover is large, the furnace temperature plummets, and the cooling rate is too fast, which will cause serious quality accidents such as spalling of the sprayed coating

Therefore, manually opening the furnace bottom cover cannot control the furnace temperature in a reasonable and effective range.

[0005] 2. The roller is placed horizontally on the hearth of the full-fiber hood mobile hot air circulation annealing furnace for heating and cooling. The advantage is that the roller surface is clean and does not need to be wiped, but the disadvantage is that the roller cannot be correctly executed according to the cooling rate of the cooling process curve.

In addition, if the local cooling rate is too fast, it is easy to cause serious quality accidents such as spalling of the sprayed coating

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