Optimization of Control System for Case Opener in Tobacco Primary Processing Line

To solve the problems of low efficiency and frequent zero drift in running the tobacco case opener in the tobacco primary processing line,the control system in the machine was improved as following:1) Installing three proximity switches for position monitoring and adding position signal feedback in PLC control program to correct the rotational position of manipulators and avoid zero drift.2) Optimizing case opening sequences to enable multiple case opening actions simultaneously.3) Adding zero searching function in the control program,starting zero searching program automatically in the event of zero drift.The results of application showed that after improvement,the frequency of zero drift reduced obviously,the failure rate of case opener decreased from 13.3% to 1.9%,it only took three minutes to search zero,and the time for case opening reduced from two minutes/case to forty-five seconds/case.