Abstract:In Huang-Huai-Hai area, the large amount of maize straw cover resulted in increasing difficulties in winter wheat sowing, and an integrated machine was developed to pick up, crush and bury the corn straw at single operation to cope with this problem. The trace and phase position of the guideway centerline of spring-finger cylinder pickup device were determined based on the working principle and working process analysis of the typical spring-finger cylinder pickup device. A kinematic analysis on spring-finger was carried out under practical condition, and changes in both movement trajectory and speed were able to meet the requirements. Straw was chopped with a fixed knife and a high-speed rotating knife, while the high-speed air flow within the crushing chamber that formed by the rotation of the chopping roller, as well as the baffle plates placed in the back of the crushing chamber, were used to adjust the proportion of the straw to be buried and scatter the partial straw from the places without baffle plates to the surface of ground. Ditching device, the outlet of straw guided-conveying device and the disc covering device were arranged from front to back, so as to sequentially complete ditching, straw-disposing and soil-covering. As indicated in the field experiment, the straw picking up rate was 93.5%, the qualification rate of straw chopping length was 92.6%, the trench depth stability ratio was 95.0% when at a operation speed of 3km/h, the proportion of straw that had been buried into the ditch was in accordance with the pre-set proportion, which showed that the proportion of the buried straw can be adjusted successfully through different widths of the baffle plates. As a consequence, all the technical indicators of this machine succeeded in meeting the technical requirements.
