摘要
为解决传统带式烟草异物剔除装置无法有效剔除重质杂物等问题,基于风选和光谱分选原理,设计了一种垂直风送片烟异物剔除系统。该系统主要由进料振槽、重物风分室、垂直风送管道、光谱检测剔除单元、料气分离装置等部分组成,采用可见光及近红外多光谱图像处理对非烟类杂物和青杂烟进行识别;设计的气流平衡开放式检测通道,提高了片烟成像清晰度;对片烟光谱特征进行分类建模,基于令牌桶的剔除保护算法,实现重质和轻质杂物分类剔除。以"黄果树(软02)"配方片烟为测试对象,均匀掺入轻质和重质杂物标靶共计150个,用于验证系统的分选性能和杂物剔除率。结果表明:1系统风力输送对片烟含水率、大中片率、碎片率和碎末率基本无影响。2系统对重质杂物的剔除率大于96%,轻质杂物的剔除率大于85%,总剔除率达到89%。3开放式检测通道设计降低了系统清洁维护使用要求。系统实现了风选和光谱除杂二合一的工艺功能,提高了非烟类杂物的剔除率。
Traditional belt tobacco sorting device cannot reject heavy foreign matter effectively, a sorting system incorporating vertical pneumatic separation and spectral sorting technology was designed. The system was mainly composed of a vibrating conveyor, a pneumatic separating chamber, vertical pneumatic conveying duct, spectral detecting and rejecting unit, material-air separation device. Visible light and near infrared multispectral image processing was adopted to identify foreign matter and greenish strips. An open type detection channel with balanced airflow was designed to improve image clarity. Via the classification model developed from the spectral characteristics of strips together with the rejection protection algorithm based on token bucket, the classification and rejection of heavy and light foreign matters were achieved. A total of 150 foreign matters, light or heavy, were uniformly mixed into the blended strips of brand“Huangguoshu （soft 02）”to validate the separation performance and rejection rate of the system. The results showed that： 1） The moisture, fines and dust contents in strips and the percentage of large andmiddle size strips were not affected by pneumatic conveying basically. 2） With the total foreign matter rejection rate of 89%, the rejection rates of the system for heavy and light foreign matters were more than 96% and 85%, respectively. 3） The designed open detection channel demanded less cleaning work. The system combined pneumatic separation with spectral sorting, it promoted the rejection rate for foreign matters.
出处
《烟草科技》
EI
CAS
CSCD
北大核心
2015年第8期76-81,共6页
Tobacco Science & Technology
关键词
片烟
异物剔除
垂直风送
多光谱
图像处理
令牌桶
气流平衡
Tobacco strip
Foreign matter rejecting
Vertical pneumatic conveying
Multispectrum
Image processing
Token bucket algorithm
Airflow balance
