RESEARCH AND VALIDATION OF AN OPTIMIZED DESIGN METHOD FOR GUIDE TUBES BASED ON THE STEEPEST DESCENT CURVE

The accuracy of seed placement is critical for achieving uniform plant spacing in the field. During seeding operations, the final seed placement is influenced by multiple factors. Irregular bouncing and rolling caused by seeds colliding with the walls of the seed guide tube during discharge is a key factor leading to low seeding uniformity. To investigate the optimal structural parameters and operational parameter ranges for the seed movement constraint device designed in this study, a kinematic analysis of its operational process was conducted. This analysis evaluated the device's operational effectiveness and the uniformity of seed placement. A multi-factor experiment was designed using central composite design and seed placement/posture detection technology. The experimental factors included buffer plate length, horizontal installation position of the guide plate, and working speed of the seed distributor. The experimental indicators were pass rate and coefficient of variation. Experimental results were processed and optimized using Design Expert-13 software. The most ideal combination was determined to be: a buffer plate length of 87.55 mm, and a guide plate horizontal installation position of 22.57 mm. At these settings, seed placement uniformity and stability were optimal, with a seed placement qualification index of 93.431% and a coefficient of variation of 9.324%. This confirms the rationality of the designed seed movement restraint device. 摘