Abstract:In order to improve the practical problems of traditional rapeseed stripping technology, such as needing large rapeseed quantity to broadcast, having big variable coefficient of row spacing and existing difference of growth rate between individual rapeseed seedlings, combining the requirement of direct agronomic requirements of rapeseed, a rapeseed spoontype precision seeding and seeding device was designed, which used the spoon to carry out precision sampling. Based on the mechanical properties of rapeseed and the agronomic requirements of holeseeding agronomy, a rectangularshaped spoonshaped hole with a notch was proposed. The working process of the seeding device was described and the main parameters of scoop assembler, spoon hole, spoon number, spoon pre-tilt angle and scoop wheel rotatory speed were determined. The influencing factors of the performance of seed meter were analyzed. The bench test was carried out by using the BBD response surface optimization test design method. The effects of the pretilt angle, the length of spoonshaped hole and the rotation speed of scoop wheel on pass rate of number of cells, the missed rate and the rebroadcast rate were analyzed. The test results showed that the spoon pretilt angle was 47.5°, the length of the spoonshaped hole was 5.4mm and the rotation speed of the scoop wheel was 24.3r/min. The pass rate of the seedling number ((3±1) capsule/hole) was 91.40%. The rate of missed broadcast (0 or 1 capsule/hole) was 4.84% and the rebroadcasting rate (greater than 4 capsules/hole) was 3.76%. The field test results showed that the average pass rate of the seedling number was 88.64%, the average rate of missed broadcast was 3.52%, the density of rapeseed was 63 plants per square meter, which met the direct agronomic requirements of rapeseed. The research had novelty in the design of spoontype seeding device, which can provide reference for the design and experiment of the rapeseed spoontype precision seeding device.
