黏性食品称重系统设计及称重方法研究

Research on Weighing Method and Design of Weighing System for Sticky Foods

为了解决黏性块状食品在动态定量称重中遇到的黏结问题,以及在称重中速度与精度的矛盾问题,分别对机械结构、电路系统和软件算法进行了设计改进和方法研究。机械结构采用双管螺旋喂料机和特殊的称斗结构;电路采用数字可编程的AD8555作为称重传感器微弱电信号的放大器,32位微处理器LPC2134作为电路系统核心;程序设计采用分阶段称重、FIR软件滤波以及微分算法,对执行机构发送命令,从而提高黏性食品的称重精度和速度。

In order to resolve the problem existing in dynamic quantitative weighing for lumping sticky foods, and overcome the conflict between speed and accuracy in weighing, the design and method of mechanical structure, electronic circuitry, and software algorithm are improved and studied respectively. For mechanical structure, the double helix feeding machine and special weighing bucket are adopted ; in electronic circuitry, the digital programmable AD8555 is used as the amplifier for weak signal from weighing transducer, and 32-bit micro-processor LPC2134 is used as the kernel of the circuitry system ; in program design, phase-in weighing, FIR software filtering and differential algorithm are selected to issue commands to actuator, thus beth the weighing speed and accuracy are enhanced for sticky foods.