The Research about the Synchronous Control for the Traction and Rolling of the Plastic Film
|School||Beijing University of Chemical Technology|
|Course||Mechanical Design and Theory|
|Keywords||Constant linear velocity Constant tension Inverter PLC Communicate|
Film winding quality control is to determine the value of the key in the final film , the the film traction and winding synchronous control objective of the study is to control the speed and tension of the traction and the winding process of the line , so to maintain constant, in order to ensure that the film does not produce tensile stretch and tension phenomenon . Determine the traction motor load is constant torque load , take-up motor load , constant power load analysis in the process of coiling process and flip traction motor winding motor speed control law , determine the the film traction and coiling constant line speed , constant tension synchronization control scheme . Selection vector control VVVF methods . The instance main circuit control system software design , hardware design of the control loop and control loop . Traction motor with constant torque speed , winding motor adopts constant power speed . Given values ??were calculated traction motor and the take-up speed of the motor based on the line speed setting ; measured by high-speed encoder pulse is sent to the PLC high-speed counter oral traction motor speed and take-up motor speed is calculated by the PLC SPD instruction , calculated in real time the diameter of the film roll , traction motor rotational speed multiplied by the transmission ratio of the two motors , and compared with the take - up motor speed , the difference between the winding motor given the compensation of the rotational speed feedback value , the set value and compensation feedback value to the analog input and built - in PI regulator inverter . Thus completing the closed-loop control of the speed . PID function using FX 2N instructions tension PI control . The personal computer to the host computer, PLC for the next crew situ monitoring and remote monitoring of the PLC through the the the special package FX-PCS/WIN-C and the SC-10 type cables .