Design and motion simulation of opener with bidirectional parallelogram linkage profiling mechanism on wheat seeder

In order to meet the wintering requirements for winter wheat, the seed must be sowed in late August and early September. As the previous crop is still growing, winter wheat is sowed at both sides in the furrow. In order to protect the growing crops on the ridge, parallelogram linkage mechanism must simultaneously achieve upper and lower, left and right profiling. Existing parallelogram linkage mechanism had achieved up-and-down profiling, so bidirectional parallelogram linkage profiling mechanism was designed, which consisted of the frame, latitudinal profiling bar, longitudinal profiling bar, and limiting rack. The profiling performance parameters were determined through force analysis. The results indicated that simulation trajectory was close to real field situation. Maximum of upper and lower profiling reached 85 mm respectively and the left and right profiling reached 100 mm. The parallelogram linkage mechanism has the advantages of simple structure and better profiling results.