食盐及其类形物的高精度定量包装设备研究

Research on High Precision Quantitative Packing Equipment for Salt and Its Kinds

针对食盐定量包装生产称量精度低、自动化程度不高等问题,对高精度食盐定量包装设备进行研究,通过分析食盐本身的物理特性,设计了称量、传送、复检反馈装置。称量装置设计为可调式量杯结构,以量杯体积估计预包装的食盐质量;复检反馈装置设计为多传感器的皮带秤结构,克服自重与重物重量比大对称量精度的影响。通过对动态称重过程中存在的误差进行分析,设计了一种基于迭代学习和模糊算法的闭环寻优定量包装控制系统。通过联机运行实验,结果表明该系统可实现食盐的高精度定量包装,具有抗扰动和自适应能力,在误差变化率小于50%的工作环境下,经过3~4次的迭代学习补偿控制,可稳定达到定量包装允许短缺量为3%的精度要求。

Aiming at the problems of low weighing precision and low automation in salt quantitative packing production,the high precision salt quantitative packing equipment was studied.The weighing device was designed as adjustable measuring cup structure to estimate the salt quality by measuring cup volume,and the re-inspection feedback device was designed as multi-sensor belt weighing structure to overcome the influence of the weight ratio of dead-weight to salt weight on the weighing precision.Analyzing the errors in the dynamic weighing process,the closed-loop optimized quantitative packing control system was designed based on iterative learning and fuzzy algorithm.Through on-line operation experiments,the results indicate that the system can achieve high precision quantitative packing for salt,which has the ability of anti-disturbance and adaptation.After 3~4 times of iterative learning compensation control,the precision requirement whose allowable shortage of quantitative packing is 3%can be reached stably under the working environment of less than 50%error change rate.