Rapid switching system and method for production of acid pickling flat coil and black flat coil

Abstract

The invention relates to a fast switching system and method for acid pickling flat coil production and black flat coil production, and belongs to the technical field of steel rolling, a wringing roller is adopted for acid pickling flat coil production, a black flat coil special roller is adopted for black flat coil production, and therefore the consumption of the wringing roller is reduced; and the quick switching between the wringing roller and the special roller for the black flat coil is realized through the quick roller changing device when the production modes are switched, so that the black flat coil is produced on the continuous pickling and leveling unit at low cost, the quick switching between the pickling and leveling coil production and the black flat coil production is also realized, and the roller changing time is shortened. In addition, the upper part of the acid tank is provided with a rapid flushing nozzle for flushing residual acid in the acid tank, so that the cover of the acid tank can be opened in a short time, the process conversion/adjustment time is shortened, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and relates to a quick switching system and method for producing pickled flat coils and black flat coils. Background technique [0002] At present, traditional hot continuous rolling mills, short-process ESP and Castrip can stably roll hot-rolled steel strips with a thickness of about 0.8mm, especially short-process continuous casting and rolling. "Replacing cold with heat" has higher added value. However, there is a big gap with cold-rolled products in terms of plate shape, mechanical properties and surface quality. Basically, such products need to be further processed by continuous pickling and leveling units or continuous leveling and straightening units in order to meet downstream customers’ requirements for plate shape and products. performance and surface quality requirements. Demand for pickled flat rolls and black flat rolls fluctuates greatly as market conditions change. If the ...

AI Technical Summary

Problems solved by technology

When switching from pickled flat rolls to black flat rolls, using the existing squeeze rolls, the high-speed dry friction will cause serious wear and tear of the squeeze rolls or even scrap them

Later, when switching to the pickling pass roll process, it is necessary to replace all the squeeze rolls, which will cost a lot

In addition, when switching to black flat roll, after the acid liquid in the acid tank is emptied, a lot of labor and time are needed to flush the residual acid liquid in the acid tank

Moreover, during the production of black flat rolls, the acid mist fan needs a large air volume to prevent the acid mist from returning to the acid tank, but the high-speed operation of the acid mist fan consumes a lot of energy and discharges a large amount of acid-containing waste gas

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