Authors

Abstract

During the sowing operation, the consistency and stability of the row dispenses of a seeder are important indicators for evaluating sowing performance. A multi-channel real-time weighing device was designed to study and analyze the consistency of row dispenses in seeder under identical conditions, as well as the stability of dispenses from a seed dispenser. This device utilized two Arduino boards as controllers for data acquisition, processing, and transmission. Based on the Serial Peripheral Interface (SPI), data exchange between multiple Arduinos was achieved in a master-slave configuration, allowing for data acquisition from 14 pressure sensors in a one-master, one-slave setup. Pressure data was collected using pressure sensors, HX711 converter chips, and Arduino. LabVIEW was utilized as the upper computer to read data from the Arduino host serial port and provide real-time display and storage. This paper presents the structural and working principles of the device. Experimental tests on the weighing unit were conducted using a test bench to evaluate measurement errors. The absolute error mean ranged from 0.143 g to 0.262 g. Additionally, the impact of the seed impact force on the error was simulated using EDEM. The device was used to evaluate a six-row wheat seeder under the experimental conditions of the groove wheel having a length of 2.5 cm and a groove wheel speed of 25 r/min. The maximum coefficient of variation for seeding stability (Y1) was 2.38%, the minimum was 0.83%, and the mean was 1.21%. The coefficient of variation for consistency of seeding in rows (Y2) was 1.86%.

Abstract in Chinese

在进行播种作业时，播种机的各行排量一致性和排量稳定性是评价播种性能的重要指标。为了研究和分析在相同条件下，同一播种机的各行排量一致性，以及单一排种器的排量稳定性，设计了一种多路实时称量装置。该装置以两块Arduino UNO作为控制器，用于装置数据的采集、处理和传输；基于SPI通信原理，实现多Arduino 的主从机数据交换，一主一从时，可实现14个压力传感器的数据采集；通过应变式压力传感器、HX711 A/D转换器芯片和Arduino实现压力数据采集；应用LabVIEW上位机用于读取Arduino主机串口的数据，并进行实时显示和存储。本文介绍了该装置的结构构成以及工作原理，通过台架试验，检验了称重单体的测量误差，并对误差做出了分析，绝对误差均值在0.143g至0.262g之间，并通过EDEM离散元仿真模拟了种子冲击力大小对误差的影响。运用该装置检验了6行单箱小麦播种机在外槽轮开度2.5cm、槽轮转速25r/min的试验条件下，排量稳定性变异系数最大值为2.38%，最小值为0.83%，均值为1.21%，各行排量一致性变异系数为1.86%。