Research And Application On Hot Strip Rolling Finish Mill Of Looper Control Technology

With the rapid development of modern industrial technology, the steel industry has developed rapidly and steel production has greatly improved. While it grows on the strip of variety, size and quality of increasing demand. Meanwhile, a higher requirement related to rolling process control was proposed as the increasing requirements of varieties, specifications and quality of the strip. Looper control is a key technology in hot-rolling process, which plays an important role in the rolling stability analysis, strip thickness control and width control of hot-rolling process. The technology has been a hot research in the steel rolling areas both at home and abroad.In this paper, based on Shougang Corporation2250Hot Finishing Mill looper as background, Firstly, the development process of hot rolling mill and looper control is Secondly, the principle of mechanical structure, the dimension and Hydraulic control principle of rolling looper is studied, as well as the dual-hydraulic servo valve control, At the same time, the hardware and software of the automation control system as the integrated function block structure is discussed, so is the looper computer control system. The paper studies the basic mathematical model of looper height and tension control and relevant parameters. Then looper system in tension and height control has been discussed in-depth. The looper from the set of control and tension closed loop control is also studied.In the actual application of the looper from the set, the slow movement speed leading to loss of tension of strip head; and a live set up to work with the strip contact moment of impact damage caused tension imbalance, and the front frame rate causing interference, so" Soft touch" control concept is proposed. The paper mainly studies "Soft touch" controller design, analysis the "Soft touch" control mathematical model for the design process, and optimize the "Soft touch" controller of the relevant parameters, ultimately a suitable soft contact controller parameters is chosen. And finally the before and after optimization looper control accuracy is compared.The development and application of "soft touch" controller play a good role in finishing rolling and improving the quality of products. The conclusion in the actual production process has been validated and related products technical indicators have improved significantly to ensure stable operation in production, and obtain good economic benefits for enterprise.