【摘要】 为监测齿盘式精量棉种穴播器在播种作业时的漏播和重播状况，基于叉指电容传感器设计了一套排种性能监测系统。通过分析齿盘式精量穴播器的工作过程，确定叉指电容传感器的安装位置；通过分析棉种运动轨迹和穴播器内部结构确定传感器的尺寸约束，完成叉指电容传感器的设计。通过阈值划分的方法实现对穴播器漏播穴、正常穴和重播穴的判断，分别对0、1、2粒棉种通过传感器时所输出的电容峰值进行标定试验，试验结果：漏播电容阈值6.808 pF,重播电容阈值6.881 pF。以STM32c8t6单片机为主控制器，控制PCAP01-AD芯片采集传感器输出的电容值，将采样电容峰值与电容阈值进行比较，得到穴播器的漏播穴数、重播穴数和正常穴数，并将排种信息通过人机交互界面显示。基于JPS-12排种性能试验台进行监测系统性能试验，结果表明：当穴播器转速为25～40 r/min时，监测系统的漏播监测精度、重播监测精度、正常监测精度的最小均值分别为88.90%、83.28%、95.06%,可有效监测精量穴播器的排种性能。更多还原

【Abstract】 In order to monitor the leakage and replanting condition of the tine-disk precision cotton seed hole planter during seeding operation, designed a set of seed discharge performance monitoring system based on the fork-finger capacitance sensor. By analyzing the working process of the tine-disk precision hole planter, the installation position of the fork-finger capacitance sensor was determined.By analyzing the trajectory of the cotton seed and the internal structure of the hole planter to determine the size constraints of the sensor, the design of the fork-finger capacitance sensor was completed. Through the threshold division method to realize the judgment of the hole seeder leakage hole, normal hole and reseeding hole, respectively, 0 grain, 1 grain, 2 grains of cotton seed through the sensor when the output of the peak capacitance calibration test, the results were: leakage capacitance threshold value of 6.808 pF, replanting capacitance threshold value of 6.881 pF. STM32c8t6 MCU as the main controller, the PCAP01-AD chip was controlled to collect the capacitance value output from the sensor, compared the peak value of the sampled capacitance with the capacitance threshold, got the number of omitted holes, reseeded holes, and normal holes of the hole seeder, and displayed the seed scheduling information through the human-machine interactive interface. Based on the JPS-12 seed discharge performance test bench, the performance test of the monitoring system was carried out, and the results showed that: when the rotational speed of the hole planter was 25-40 r/min, the minimum mean values of the monitoring system for the leakage monitoring accuracy, reseeding monitoring accuracy, and normal monitoring accuracy were 88.90%, 83.28% and 95.06%, respectively, and the seed discharge performance of the precision hole planter could be effectively monitored.更多还原