Hot rolling strip steel post-finish-rolling cooling control device

Abstract

The invention relates to a hot rolling strip steel post-finish-rolling cooling control device which comprises a coarse cooling upper collection pipe flow sensor, a coarse cooling lower collection pipe flower sensor, a finish cooling upper collection pipe flow sensor, a finish cooling lower collection pipe flow sensor, a coarse cooling upper collection pipe water valve, a coarse cooling lower collection pipe water valve, a finish cooling upper collection pipe water valve, a finish cooling lower collection pipe water valve and a programmable logic controller (PLC). The device is characterized in that the signal output ends of the coarse cooling upper collection pipe flow sensor, the coarse cooling lower collection pipe flow sensor, the finish cooling upper collection pipe flow sensor and the finish cooling lower collection pipe flow sensor are connected with the signal input end of the PLC, and the signal output end of the PLC is connected with the control ends of the coarse cooling upper collection pipe water valve, the coarse cooling lower collection pipe water valve, the finish cooling upper collection pipe water valve and the finish cooling lower collection pipe water valve. By means of the device, front stage cooling acceleration can be achieved according to requirements, and the product production range is expanded under the condition that the cost is not increased, and the original production level is not affected. The device is simple in structure, low in cost and convenient to operate.

Description

Technical field [0001] The present invention relates to a control device, in particular to a cooling control device for hot-rolled strip steel after finishing rolling. Background technique [0002] After the hot-rolled strip passes through the finishing rolling stand, the temperature can reach above 800℃, and the internal structure is in a state of complete austenite recrystallization. Cooling is required to control the recrystallization process of the internal structure after the strip exits the finishing rolling zone to ensure the coiling temperature . At present, for controlled cooling after rolling, laminar cooling with a relatively slow cooling rate is generally used, so that high-strength pipeline steel and engineering machinery steel that require faster cooling rates cannot be produced at low cost without additional alloy addition. At the same time, the excessively high air cooling temperature after the rough cooling section also makes the performance of low alloy steel a...

AI Technical Summary

Problems solved by technology

At present, laminar flow cooling with a relatively slow cooling rate is generally used for post-rolling controlled cooling, so that high-strength pipeline steel and construction machinery steel that require faster cooling rates cannot be produced at low cost without adding additional alloys. At the same time, the high air cooling temperature after the rough cooling section also makes the performance of low alloy steel and automobile girder plate unstable

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