Research on Dual Sliding Mode Control of Winding Tension in Annealing Tinning Machine Based on Dual Observers

Tension control of the annealed tin-plating process is a key factor affecting the quality of copper wire. Aiming at the problem of fluctuations in copper wire tension caused by factors such as non-linearity, time delay and time-varying parameters in the winding system, a system dynamics model of the winding section of the annealing tinning machine is constructed, and an expanded state observer and a tension observer are designed. An integral sliding mode control is proposed as the outer tension loop to reduce the delay between tension and speed; a robust inverse sliding mode controller is used as the inner speed loop to achieve stable tracking of the winding speed; Finally, a dual sliding mode control strategy based on dual observers for inner and outer loops of winding tension is proposed. Calculation and experimental results show that the system can converge quickly when the tension fluctuation range is large, and the tension fluctuation range is only between O.2N and O.SN, which verifies that the control strategy proposed in this paper has good robustness, anti-interference and dynamic response performance. The research results provide new ideas for precise control of winding tension of annealing tinning machines.