基于Labview的单螺杆挤出机温度测控系统设计

Design of a Temperature Measurement and Control System for the Screw Extruder Based on Labview

针对单螺杆挤出机挤出PP材料稳定性差及挤出质量欠佳的问题,一是对螺杆的结构进行了改进设计,由此能够沿螺杆轴向长度方向布设6个温度传感器并能够可靠地进行测温工作,加上原本料筒处测量温度的9个点,从而可以有效监控挤出机不同位段机筒内壁与螺槽壁的温度分布状况;二是设计了一套基于Labview的温度测控程序,分析了挤出温度和压力对挤出材料的影响,通过Z-TIO温控模块内的PID控制料筒的加热或冷却使温度趋于设定值.研究结果表明,本文方案能够精确测定、描述和调控挤出熔体各区段的温度,拓展了单螺杆挤出机的温控范围,提高了熔体温度测控的精确性且操作方便.

First, in light of the problems of poor stability and quality of the PP materials from the screw extruder, the structure of the screw was improved by placing six temperature sensors along the axial direction of the screw, which can measure temperatures in a reliable way. Together with the nine points originally installed on the charging barrel, they can effectively control the temperature distribution on the inner surface and the spiral groove wall of the different segments of the extruder. Secondly, a temperature control program was designed based on Labview to analyze the effects of extrusion temperature and pressure on the extrusion materials. Through the heating or cooling of the PID control cylinder in the Z-TIO temperature control module, the temperature approximates a set value. The research results show that this scheme can accurately measure, describe and control the temperature of each section of the melt extrusion, expand the temperature range of the single screw extruder, improve the accuracy of the melt temperature control and is easy to operate.