Select the seedling taking track in the seedling taking mechanism of double arm second-order free non-circular gear planetary system pot seedling transplanter for comparison, as shown in the figure. In order to facilitate comparison, the following figure establishes a rectangular coordinate system based on the axis of the seedling feeding tray, keeps the shape and size of the two tracks unchanged, and overlaps their cusps.
Compared with the original track, the improvement effect of the corresponding mechanism is as follows: the minimum width of the seedling taking section is reduced by 3.88 mm, and the swing angle of the seedling taking arm in the bowl entering section is reduced by 2.43 °, which is conducive to the seedling taking claw and pricking hole; The distance between the track of the recovery section and the seedling feeding tray increases by 8.75 mm, and the safety margin between the seedling taking mechanism and the seedling feeding device is greater; The highest point of the track decreases by 42.67 mm, the lowest point decreases by 3.89 mm, the maximum swing angle of the seedling taking arm decreases from 62.21 ° to 55.47 °, and the maximum transmission ratio of the non-circular gear decreases from 1.92 to 1.81, indicating that the requirements for the unequal velocity fluctuation amplitude of the non-circular gear can be reduced through appropriate track planning, which is conducive to the smooth transmission of the mechanism.