西南地区小型移栽机自适应定深栽植装置设计与试验OA

Aiming at the problem of irregular ridge surfaces in the mountainous and hilly terrains of Southwest China,which makes it difficult for traditional transplanters to adaptively adjust the planting depth,an adaptive constant-depth planting device was proposed for small transplanters in Southwest China.Based on the agronomic requirements for vegetable plug seedlings and the design specifications of the mechanism,kinematic modeling of the mechanism was conducted,and the working principle of the planting system was analyzed.Using the results of the kinematic modeling,a computer-aided analysis and optimization interface for the planting mechanism was developed to study the mapping relationship between structural parameters and the planting trajectory.By establishing an objective optimization function and setting mechanism constraints,a relatively optimal parameter combination was obtained by using the successive approximation method.A simulation test for constant-depth planting was conducted,verifying that the proposed mechanism can adjust the planting depth through five sets of angle variations,while meeting the requirements for the planting trajectory and the velocity at the planting endpoint.A static trajectory test of the mechanism was carried out,showing that the maximum error of the lowest point between the five sets of actual static trajectories and the simulated static trajectories was 6.86 mm,and the maximum error in trajectory height was 13.98 mm,with a high degree of coincidence for each set of trajectories.The constant-depth planting performance test indicated that,at a planting frequency of 15 plants/min and a unit speed of 3.6 m/min,the hole width on both flat and uneven ridge surfaces was less than 100 mm,the qualified planting rate was above 94.45%,the maximum coefficient of variation for plant spacing was 3.86%,and the average qualified rate for planting depth was above 92.22%,demonstrating the feasibility of the mechanism for adaptively adjusting the planting depth.