无水胶印输墨系统油墨温度控制方法

油墨温度控制系统是无水胶印设备的重要控制组件之一,对保持油墨黏度稳定和印刷质量的一致性有重要影响。通过建立温控墨辊表面墨层热载荷时变函数模型,计算墨辊表面油墨平均温度发生变化时的热载荷变化量,根据对温控墨辊螺旋管道的传热性能参数进行等效,在采用涡流管作为温度双向控制伺服装置的前提下,确定了温控气体在设定出入温度差的条件下的输入流量,将温控气体的输入参数,包括流量值、入口温度值作为涡流管伺服控制器的输入参数,建立油墨温度PID整定控制模型,并基于Lab VIEW设计了控制系统。仿真结果表明控制模型合理,无水胶印油墨温控系统控制精度达到±1℃。

Research on Temperature Controlling Method of Inking Unit on Waterless Offset Press

The temperature controlling system of ink is the significant component and has important influence on the stability of ink viscosity and consistency of printing quality. The variable quantity of thermal load of the ink was calculated when its average temperature changed by modelling the time-variable function of the thermal load of the ink on the surface of oscillating ink roller. The input flow of temperature controlling medium was ascertained in the condition of given temperature deviation on the premise that the vortex tube was adopted as the bifunctional temperature controlling mechanism based on the e-quivalent processing of the heat conduction performance of the internal helical pipe of the roller. The characteristic parameters of the medium,including flow and temperature,were chosen as the input variables of the servo valve on the vortex tube for modelling the PID controlling of the ink temperature. The inking control system was designed by using LabVIEW software and the validity of modelling was verified by the simulation.