Design Of Electrical Control System For Zero-speed Splice Machine

Zero-speed splice machine is a kind of universally used accessorial equipment which can match up with multiplicate soft packaging machine. To carry out"produce without pause", the mainframe should not pause while the tension can meet the requirement set by users during all the process of manufacture, the zero-speed splice machine comes into being. Zero-speed splice machine can keep the splice unit stationary while the mainframe could run according to the set speed. How can it perform? It is depend on a unit of film tank which is not existed in the commonly used equipment of turret splicing unit. During the splice process, the film used by the mainframe is supplied by the film tank while the film in the splice unit is held still. In this way, not only both the rate of successfully splice and the veracity is enhanced, but also"produce without pause"is ensured. Both the quality and productivity is improved greatly. In addition, as the rate of successfully splice is raised and the tie-in is shorten, the rate of material utilization is raised. This paper research focuses on making the zero-speed splice machine an accessorial equipment for print machine, coating machine and bag-making machine etc, which is of high rate of successfully splice rate, widely used, easy to mount and operate and of good security.Firstly, by investigating the status quo of the zero-speed splice machine from both home and abroad, the achievements and the problems still existing are known, to meet the requirements on speed and tension in zero-speed splicer machine, the key performance target of the control system is brought forward. With this, the next is to choose hardware and design the software for the control system accordingly. Mainly this paper researched the problem of how the unwind motor, the sensor and the break resistance should be chosen and how the tension during the flow is controlled. The control stratagem of PID control is used here. With the help of the math model set up by the software of MATLAB/SIMULINK, the system stability, robusticity and its dynamic and stable index is analyzed. Lastly, the control program is written on the platform of the S7-200 controller from Siemens according to the feature of the software and the requirements of the control system. It is proved that the designed control system can meet the requirements: stable tension in the manufacture process, smoothly transition in velocity and good security.