喷气织机断纬检测移除系统研究

Study on weft removal detection system for air-jet loom

断纬检测移除系统是可在喷气织机织造纬纱断纬时实现停车、自动寻找并移除断纬的一种装置。为了提高断纬识别率,针对其纬纱所处的实际环境,设计了一种基于嵌入式单片机的喷气织机断纬移除检测系统,利用二阶有源带通滤波电路对信号进行的滤波和放大,有效抑制信号中的高频和低频干扰,同时放大有效信号。采用快速傅里叶变换对采样数据进行后处理,将时域信号转换为频域信号,根据纬纱种类的多样性,利用动态阈值比较法判断是否检测到纬纱。实验结果表明:所提方案在实际生产环境中具有良好的抗干扰性能,识别率达到92%,可显著提高断纬检测移除模块的纬纱检测成功率。

The weft removal device is a device capable of automatically finding and removing discarded wefts when it is stopped in the weft jet. In order to improve the recognition rate of weft,a weft removal detection system for air jet looms based on embedded single chip microcomputer was designed for the actual environment of weft yarn. The second order active bandpass filter circuit was used to filter and amplify the signal,effectively suppress the signal in the high frequency and low frequency interference and amplify the effective signal. The fast Fourier transform was used to process the sampled data,and the time domain signal was converted into frequency domain signal. According to the diversity of the weft type,the dynamic threshold comparison method was used to determine whether or not the weft yarn was detected. The experimental results showed that the proposed scheme had good anti-jamming performance in the actual production environment,and the recognition rate was 92 %,which greatly improved the success rate of weft detection of the weft detection module.