DESIGN AND ANALYSIS OF PITCH-TYPE SINGLE SEEDING TEST PLATFORM

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.