热牵伸辊非接触式旋转温度变送器的设计

 热牵伸辊表面温度测量精确度直接影响到热牵伸辊温控系统的控制精度，为此设计了旋转温度变送器，以解决热牵伸辊在高速旋转和高电磁强度下的精确测温问题。设备采用感应耦合电能传输技术，为其旋转部件非接触供电，使用集成了数模转换器的C8051F单片机完成温度采集和处理，并利用红外技术解决旋转部件的数据传输和抗干扰问题。软件方面采用滑窗平均滤波算法抑制干扰，采用分段线性插值法提升测温准确性。在辊体转速高达8000 r/min情况下，非接触式供电和红外数据传输稳定，温度测量精度达到0.1 ℃，3个多月运行结果表明，设备的稳定性及测量精度均达到设计要求。

Design of non-contact rotational temperature transmitter for heated drawed roller

Measuring accuracy of temperature on the surface of heated drawing roller affects directly control accuracy of the system, so rotational temperature transmitter was designed to solve the problem on accurate temperature measurement when roller was spinning and electromagnetic interference was very serious. The equipment used inductive coupled power transfer technology to supply non-contact power for its rotating part. It used C8051F microcomputer integrated analog-to-digital converter to complete temperature acquisition and treatment, and used infrared technology to solve the problem on data transmission of rotating part and anti-interference. The software design of transmitter was with the sliding window filter for interference suppression and with the method of piecewise linear interpolation for improving measurement accuracy. It is proved that when the roller is spinning at the speed of 8000 rpm, non-contact power and infrared transmission work stably and the measurement accuracy can reach 0.1 degrees Celsius. Experiment results over three months show that stability and measuring accuracy of the transmitter have reached the design requirements.