Cold-rolled coil tunnel annealing furnace

Abstract

The invention discloses a cold-rolled coiled strip tunnel type annealing furnace. The cold-rolled coiled strip tunnel type annealing furnace comprises an annealing furnace body, wherein a plurality of regions with different temperatures are arranged inside the annealing furnace body from a feeding hole to a discharging hole; a first rail is arranged at the bottom of the annealing furnace body; a plurality of trolleys for carrying cold-rolled coiled strips and running along the rail are arranged on the first rail, and all trolleys support against each other; a second rail is arranged at one side of the annealing furnace body in parallel at an interval, a first movable support and a second movable support are respectively arranged at two ends of the first rail, a cart device is respectively arranged at each of one end of a feeding hole of the first rail and one end, which corresponds to the annealing furnace, of a discharging hole of the second rail, and the first movable support and the second movable support can reciprocate between the first rail and the second rail so as to enable the trolleys to operate. By adopting a continuous production process and whole automatic control, the annealing furnace has the advantages of high yield, remarkable energy saving and emission reducing effects, low labor intensity, small occupation area, and low investment cost of equipment and a factory.

Description

technical field [0001] The invention relates to the field of micro-oxidation stress-relief annealing of cold-rolled coils in welded steel pipe production enterprises, in particular to a tunnel-type annealing furnace for cold-rolled coils. Background technique [0002] The production of welded steel pipes is divided into the following processes: pickling of hot-rolled steel coils, cold rolling, cutting, annealing, and welded pipes. When the hot-rolled steel coil is rolled to the thickness required by the welded pipe process through the cold rolling mill, there is rolling internal stress inside the steel coil. If the internal stress is not eliminated, cracks will appear in the steel coil during the deformation process of the pipe. Therefore, stress relief annealing is a very critical link in the production process of welded steel pipes, which has a great impact on the quality of welded steel pipes. [0003] Since the slight oxidation of strip steel can be accepted in the pro...

AI Technical Summary

Problems solved by technology

The advantage of the trolley-type annealing furnace is that the investment in equipment and workshops is less, and the disadvantage is that the output is relatively low

[0006] Bell-type annealing furnaces and trolley-type annealing furnaces also have a common disadvantage that they adopt a periodic production process. The cold-rolled strip coils remain stationary in the furnace and complete the annealing process of heating, heat preservation, and cooling together with the furnace body. As a result, the exhaust gas volume and exhaust gas temperature of the annealing furnace are unstable, sometimes high and sometimes low, and effective waste heat recovery of flue gas cannot be carried out, resulting in serious energy waste

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