The loop control in 1500mm hot-rolling line is one of the central control technologies in finish rolling and it's very important to the quality of final steel strip.

Based on the production of Angang high speed wire rod mill, The paper analyzed the main control function of high speed wire rod mill: speed adaptaion, loop control, minimum tension control, material traching, etc.

A general introduction was made on effect, control principle and PLC logic control of the loop control system in high speed rod rolling.

Design and application of looper control technology in the wide rolling mill of Lai Wu iron and steel company;

The basic principle for the looper control of the high speed wire pre-finishing rolling mill has been described in this article,as well as the form and the reason of the looper fluctuation.

Main functions include speed cascade control,tension control,looper control,APC control etc.

Based on the project of continuous pickling line in cold rolling mill of Tangshan Jianlong, this paper studied the entry loop s control system, especially further studied the tension control and the accumulator control of the entry loop, and have finished a large amount of theories and practice work.

The control principle and function implement of speed master control,looper height control and head & tail track,and the configuration of control system are described.