Properties Research And Parametric Design Of Vacuum Belt Paper-Conveying Device

Vacuum belt paper-conveying device is a significant portion of printing press with the main function of transporting the separated paper to positioning device. Its performance directly affects the feature of paper conveying and the quality of printed products. By analyzing and studying the paper-conveying feature, this subject develops a parametric design software by synthesizing the knowledge on mechanism kinematics, parametric design theory and VB coding technology in order to meet the request of the analysis of dynamic character and the parametric design of vacuum belt, which is valuable both in theory and practical application.The main contents and innovation are as follows:(1) By using mechanism kinematics, a kinematical analysis of eccentric gears for the paper-transferring mechanism with variable speed is made, then the kinematical characteristic curve of vacuum belt is obtained to provide a basis for further theoretical calculation and analysis of the relative transmission area.(2) According to the feature of vacuum belt conveyor, the analysis model of forcing on paper and the mathematical model for relative area are set up. On the premise of ensuring the stationary of paper transmission, the relationships between negative pressure value of the air chamber, paper type and printing speed are obtained.(3) On the basis of the research on the parametric design theory, the deep study on SolidWorks secondary development API functions is made in order to establish the theoretical basis to create the parametric modeling.(4) Based on VB, by synthesizing SolidWorks secondary development technology, the function analysis and design of vacuum belt paper-conveying calculation analysis and parametric design software are completed, including data import, analysis of the motion of vacuum belt, relative transmission area calculation, analysis of forcing on paper and data export. Finally, the practical user interface and operation effect of the software is shown in a case study, and also the discussion on further study is made.