Authors

Abstract

To address the difficulty in evaluating the performance of the seeding unit profiling mechanism, a pitching testing platform for examining seeding units with profiling mechanisms was designed. The main system and key component parameters of the testing platform were determined, and a hydraulic system was developed to overcome the challenge of simulating field undulation curves. The feasibility of the hydraulic and transmission systems was verified using RecurDyn dynamic simulation technology. The simulation results showed that the hydraulic system of the testing platform could effectively reproduce wave curves at different speeds, with a maximum roller stress of 46.61 MPa and a maximum strain of -73.99 × 10-6. To further evaluate the actual performance of the testing platform, the seeding unit of the Debont 1205 high-speed no-till corn planter was used as the test object. Using the average adjustment time and average adjustment accuracy as evaluation indicators, parameters were collected at operating speeds of 2.22 m/s, 2.78 m/s, and 3.33 m/s, and compared with those obtained from the testing platform. The test results revealed that the maximum error in the detection of average adjustment time was 0.27 s, and the maximum error in the detection of average adjustment accuracy was 2.58 × 10⁻³ m. These findings indicate that the testing platform can effectively evaluate the regulation performance of the profiling mechanism at different operating speeds and provide an accurate indoor platform for testing seeding units.

Abstract in Chinese

“针对播种单体仿形机构性能缺乏有效检测手段的问题，本研究开发了一套专用于带仿形机构播种单体的室内投掷性能检测平台。该平台的关键在于设计并集成了液压系统，以精准模拟田间复杂的地面起伏轮廓。研究详细阐述了平台的核心构成系统及关键部件的参数设定。为验证方案可行性，利用 RecurDyn 动力学仿真技术对液压与传动系统进行了建模分析，结果表明：平台液压系统能有效复现不同行进速度下的起伏地形波浪曲线；关键滚筒部件的最大应力为 46.61 MPa， 最大应变值为-73.99x 10-6，均处于安全范国内。为评估平台的实际检测效能，选用Debont 1205 高速免耕玉米播种机的播种单体作为测试对象。在实际田间作业中（8km/h、10km/h、 12km/h速度下），采集了仿形机构的平均调节响应时效和平均调节精度作为基准指标。将这些指标与在检测平台上获取的对应数据进行比较。对比测试结果显示：检测平台测得的平均调节时间最大误差为 0.27秒；平均调节精度的最大检测误差为 2.58 毫米。此结果证明，该检测平台能够可靠地评估不同作业速度下仿形机构的动态调节性能，成功构建了一个精确的室内测试环境，为播种单体的性能检测提供了有效解决方案。”。