基于轴承振动特性的球磨机筒内料位监测

为提高工业球磨机的生产能力并降低能耗，提出了使用磨煤机的轴承振动特性来测量球磨机筒内料位的新方法。该方法通过使用2个安装在轴承座外壳上的振动传感器来采集磨煤机轴承振动信号，通过设计的基于KINGVIEW及VC++ 软件平台信号采集系统采集振动信号，并使用小波包分析技术对振动信号进行计算处理，将原始信号转换成能量幅值。在此基础上，以某250 MW电厂为例研究研磨时间、无通风、有通风工况下不同料位与振动特性的关系。实验结果表明，磨煤机的筒内料位状态，如过载、稳态等，可以通过振动特性来反映。通过振动特性来测量料位，磨煤机的工作性能可以得到改善。

Vibration Characteristics for Reflecting Level of Coal Powder Filling in an Industrial Tubular Ball Mill

To achieve improvements in the production capacity and energy efficiency of an industrial tubular ball mill, a novel method, reflecting the level of coal powder filling in the ball mill by using vibration characteristics, was proposed. Two accelerometers were installed on bearing housing to pick up the vibration transferred from the mill shaft. A system was designed to record the vibration signals and transfer them into energy amplitudes, by using a wavelet packet approach, based on the KINGVIEW program, as well as Visual C environment. Based on these, a series of experiments was conducted in a 250 MW power plant to investigate the vibration characteristics corresponding to different powder filling cases, including the effects of different levels without air particle removal, milling times, and varying levels in practical working conditions. The experimental results show that the cases of powder filling in the mill, such as mill over-load, stable case, etc., can be reflected by vibration characteristics. By mean of these vibration characteristics of ball mill, the performance of ball mill can be improved.