| Summary: | 碩士 === 國立中興大學 === 農業機械工程學系 === 89 === The study used the PC-Based control system to control the flow rate and weight of the testing materials by changing the opening of inlets. The weighing machine has two-stage feeding mechanism to increase the measurement accuracy. The PC-Based control system used LabVIEW programs to trigger programmable logic controller (PLC). Then, PLC can control the opening of the inlets. At the same time, the weight signal can be obtained by means of DAQ card. We used Load Cell as a weighing sensor. The data were analyzed. We designed and manufactured a device to measure the friction coefficients of three materials. Their physical properties were also measured. Those physical properties can affect weighing conditions. Furthermore, we established a lookup table for flow rate versus expected weight. Based on the lookup table, the machine can proceed two-stage feeding to obtain expected weight after setting system parameters. For brown rice, the error in weighing was about 1.3 %.
Keywords: Weighing, Signal acquisition, Load Cell
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