Continuous annealing furnace

Abstract

The invention discloses a continuous annealing furnace, which comprises a furnace body, wherein a feed inlet is arranged on the front end of the furnace body; a discharge opening is arranged on the rear end of the furnace body; a hearth in which material strips are heated is formed in the furnace body; when the furnace operates, the hearth is filled with a protective atmosphere; the front end of the hearth is provided with a tension roll I; the rear end of the hearth is provided with a tension roll II; a circulating fan assembly is arranged on the furnace body; and under the tension actions of the tension roll I and the tension roll I, the material strips floats when blown by high-speed air flow blown out by the circulating fan assembly. The furnace is simple and practical; and the furnace has the advantages of high heating speed, high efficiency, uniform heating temperature, fine grains, easily-controllable performance, complete surface, high equipment automation and the like, so demands of domestic and overseas markets can be satisfied and China-made continuous annealing furnace equipment can be realized.

Description

technical field [0001] The invention relates to heat treatment equipment for aluminum plates and strips, in particular to a continuous annealing furnace. Background technique [0002] The output of China's aluminum strips and foils is insufficient, so they are imported in large quantities year after year. Imported aluminum strips are mainly high-precision strips that cannot be produced or are rarely produced in China. Imported high-precision aluminum strips are the largest foreign exchange users in China's nonferrous metals industry. There is a large demand gap for high-precision strip products in China, which is related to the insufficient assembly of high-precision strip production equipment. Continuous annealing is one of the key equipment for the production of high-precision strip products. The continuous annealing production line consists of uncoiling, sewing, tension control rollers, annealing furnace, cooling chamber, straightening, curling and other equipment, and th...

AI Technical Summary

Problems solved by technology

[0004] 1) Aluminum and aluminum alloy sheets and strips have very low strength and high viscosity at annealing and quenching temperatures, and are easy to bond to each other or to other contacts to cause scratches;

[0005] 2) The aluminum plate and strip are heated in coils in ordinary box-type heat treatment furnaces, and the heat is gradually transferred from the outside of the coil to the inside of the coil by conduction. As the diameter of the coil increases, the heating time also increases, sometimes as long as more than ten Hours, in such a long heating process, because the outer layer of the coil is at high temperature for a long time, the grain growth is particularly serious, resulting in serious uneven grains inside and outside the coil, resulting in inconsistent physical and mechanical properties of the aluminum sheet and strip;

[0006] 3) It takes 3-5 days to cool down naturally in the form of coils; at present, the coil cooling problem of the box annealing furnace can be solved on the air cushion furnace, and the strip is cooled on the air cushion furnace, so the cooling time is greatly accelerated;

[0007] 4) The oil stain or oil stain attached to the surface of the plate and strip during rolling is not easy to volatilize during the heating process, so stains appear and affect the surface quality;

[0008] 5) Due to the heat treatment in batches, the efficiency is low and the cost is high

[0009] In addition, the use of an air-cushion annealing furnace can effectively solve the shortcomings of the box-type annealing furnace, such as long annealing time, easy scratches on the surface, oily strip surface, and low efficiency. Suitable for the needs of the domestic market

At present, there is no domestic aluminum strip continuous annealing furnace in the market, so the development of a continuous annealing furnace suitable for the domestic market and with a moderate price has broad market prospects

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