【摘要】 应用声超声及超声穿透试验对钢板上有无煤负载两种情况进行了对比研究。结果表明:两种情况下,接收信号的峰幅、信号水平以及时域波形和幅值谱差异很大,根据这一差异可判断出钢板上是否有煤负载;煤对超声衰减很大,250kHz以上频率的超声难以穿透35mm厚度的煤层。该结论对超声在球磨机料位检测方面的应用具有一定的指导意义。更多还原

【Abstract】 A comparison study on two situations, with and without coal load on a steel plate, has been carried out by using audio and ultrasonic frequency. Results show that the peak amplitude of received signal, signal level, as well as waveform in time domain and amplitude spectrum have very great difference under said two situations. Based on the said difference, judgement of whether coal load exists on the steel plate or not can be made. The ultrasonic attenuation through coal is very great, ultrasonic frequency above 250 kHz is difficult to penetrate through coal layer of 35 mm thickness. This conclusion has certain guiding significance in aspect of applying ultrasonic frequency to detect material level in ball mills.更多还原