Mechanism Simulation And Control System Research Of Pneumatic Impression On Offset Prnting

The automatic control system of pneumatic impression is considered one of the most important symbols of modern printing machine. This article studied on impression system of sheet-fed press, carried out kinematics analysis and simulation, designed pneumatic and control system with the purpose to meet utility requirements for modern press machine. The main contents and innovations are as follows:1. Analyzed kinematics disciplinary between blanket cylinder and pneumatic cylinder with plural vector method. Realized kinematics simulation of the pneumatic impression mechanism, ensured flexible impacting between cylinders on the time of impression.2. Build finite element mathematics model between torsion angular and torsion moment of synchronous torsion pole, make sure the pole has sufficient torsion stiffness to accomplish parallel movement on both sides of the blanket cylinder.3. Build finite element model of the float blanket cylinder structure and calculated the lower 4 inherent frequency of the structure with Block Lanczos method to ensure the cylinder work smoothly at high speed.4. Designed the pneumatic system, calculated the design parameters and ascertained the type of pneumatic components, draw pneumatic system chart.5. Adopted PLC as the controller of the system, realized the program running by TRiLOGI PLC simulation software and PLC experiment board.Pass research of this article, presented a new type of impression mechanism toreplace the former cam-bar one. This work can improve design level of homemade press machine, reduce the gap between top grade ones.