Aiming at the problems of poor road transport clearance, difficult headland turning, and low adaptability to complex terrain of wide-width cotton film-laying seed drills, a horizontally folding wide-width film-laying seed drill was designed in this study. The overall structure and working principle were described, and theoretical analyses were carried out on key components such as the folding frame, lifting mechanism, parallelogram profiling mechanism, and hydraulic system. The main dimensions of each component and the force variation pattern of the connecting rods during lifting were determined. A rigid-flexible coupled model of the whole machine was established using ANSYS-ADAMS, and dynamic simulation of the lifting process was conducted to obtain the location of the maximum stress point on the folding frame and the deformation curves of the lifting device. Stress tests on key positions during the dynamic folding process were performed with a multi-channel signal conditioning system. The correlation coefficients between the fitted simulation curves and the measured curves at all test points were above 0.88, and both the residual standard deviations and the amplitude errors remained within 15%. Field trial results showed: a void rate of 2.4%, a single-seed rate of 96%, a seed spacing qualification rate of 97.1%, a seed damage rate of 0.57%, a qualified rate of sowing depth under film of 95.4%, a qualified rate of soil cover thickness at film edge of 96.22%, a qualified rate of soil cover width at film edge of 97.32%, a longitudinal elongation of the plastic film of 5.11%, a qualified rate of width of the daylighting surface of 91.8%, a flatness of the daylighting surface of 98.8%, and a longitudinal elongation of the drip tape of 0.76%. All operation indicators met the requirements of national and professional standards.
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