| Cold rolling strip is a kind of products with a high additional value. It is a primary material of automobile, mechanical engineering, architecture, electrotechnics, electron, and food industry. With the increase of sheet metal in the market, the 1450mm reversible cold rolling mill has become the first choice by users, which has the speciality of less investment and rolling many kinds of materials. Because of high torque, each work roll is drived by two motors in series. To keep rotate speed of work roll consistent, the speed regulating system should meet the demand of high precision and high dynamic performance. Under this background, the paper is focused on the research and design on the work roll load balance control system of cold rolling mill.Based on the main drive of 1450 mm cold rolling mill of Tianjin Jixing cold rolling steel factory, the paper does further studies in the control method of two motors in series, especially does further studies in the load balance control of work roll driving motor. And have finished a lot of theoretical and practice work.Firstly the paper briefly introduces the general situation of rolling mill, the choice of the main driving motors and drive mode of the motors. Secondly focused on the control method of two motors in series, introduces transfer function of every part and dynamic framework of DC motor speed control system. Then introduce the realizing method of load balance control to keep the speed of the upper work roll equal to the lower. Moreover, particularly introduces the selecting of hardware and software configuration. At last, exactly introduces debugging situation in factory and technique difficulty, and analyzes the effect of control based on the curve of current and speed monitored by HMI on line.Producing practice proves that the designed control system of mill main drive has achieved the wanted qualifications, which brings the enterprises good economic benefits. |
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