Application of pneumatic tension control system for unreeling

ZHANG Ya-feng

（School of Optoelectronic Engineering，Changzhou Institute of Technology，Changzhou 213002，China）

Abstract：In order to solve the problems of the broken paper and paper yaw，the pneumatic technology was investigated for unreeling. After the analysis of the control process of constant tension for the paper land，a method was presented to test the paper land tension through floating roll displacement variety for air cylinder，and achieve constant tension of the paper land with gearshift integral PID algorithm. Pneumatic tension control system was designed with MCS-51 single-chip microcomputer for main control chip，displacement sensor for feedback device and electricity-controlled pneumatic ratio valve for actuator. The running result of system shows that，the cylinder floating roll displacement can respond quickly to changes in tension，and it has good stability，low displacement deviation，high control precision，and strong robustness，so it has important reference meaning on constant tension control for reeling or unreeling.