The looper up and down process control method was proposed and successfully applied in China , and the looper control system together with the looper control system was used to solve the problems of product stability control, especially the size control of head and tail steel in bar finishing rolling area, wire pre-finishing rolling area and finishing rolling area.

Core technologies: accurate biting and throwing steel signal acquisition and sliding forward and backward sliding measurement technology, safe and accurate pre-lifting and dropping control, lifting and dropping process control (compensation control), variable proportion integral coefficient control in sleeve height control, looper optimization control;

Control precision: the length of head and tail steel caused by starting and setting is less than 2 meters, and the control precision of other parts meets the production needs of exceeding one group tolerance (half of one group tolerance).

Typical applications: high wire production line, Tecsun 1 bar production line, Shaogang special bar in bar production line, etc.