Study On Mechanism And Parameters Of Maize Bud-seed Bowl-tray Precision Seeder

In this study, according to the actual demand for maize bud transplanting seedling of bunch planting corn milk cold, research and explore deeply on seeding mechanism using theoretical analysis, modeling and simulation, high speed camera and experimental research on the maize bud-seed bowl-tray precision seeder developed by ourselves.1. According to the difference of grain traits, select 3 maize varieties, De Meiya 1 (circular), consider Longdan 47 (partial Square) and Xianyu 335 (wedge type) which are planted in cold as the research object, measure the physical properties of their bud-seed. The study have a direct significance on designing important parts, seeding box and more.2. Establish the motion mode of bud-seed in the process of seed-filling on the precision seeder, gain the total trajectory equation of bud-seed, identify the key factors affecting the performance of seed-filling. When the maize bud-seed was looked as parallel hexahedron structure, obtain state probability after filling according to the present state of area. As the state of "lying" and "lying on the side" have larger probability after seed-filling, establish relation mode of the diameter of shaped hole and velocity of seed box on the two states. Determine the range of diameter of shaped hole and depth of shaped hole. Reveal the mechanism of seed-filling and provide a basis for determining the main factors influencing the seed-filling performance index and range.3. Study the single factor test on the depth of shaped hole, diameter of shaped hole and velocity of seed box and analyze the influence to single-seed rate, empty-seed rate, multi-seed rate, damage rate and broken rate and determind adaptive value. According to the test study result of single factor, select two factors, diameter of shaped hole and velocity of seed box and design multi-factor test. The regression model about the performance index and factors were obtained by quadratic orthogonal rotary experimental design and discussed the influence regularity of different factors on performance indexes. Obtain the principal factors by regression analysis. Adopt main objective function, use equation of regression of different performance index and optimize the result, obtain the optimized factors. Through the verification test, performance index can meet the technical requirements.4. Establish the dynamic model based on the Lagrange equation for maize bud-seed in the dropping process, Reveal the change rules of bud-seed quality, the initial position and angular displacement of rotation plate, angular velocity of rotation plate and other parameters. Simulating the dynamics model, obtain relation curves of displacement, velocity and acceleration and time, angular velocity of rotating plate and time, bud-seed speed and angular velocity of rotating plate. Simulating the kinematics mode, obtain relation curves of motion direction angle of bud-seed, absolute velocity and time, acceleration and displacement of bud-seed, angular displacement of rotating plate, angular velocity of rotating plate. Establish motion mode of bud-seed which separated from rotating plant, Simulate the motion model, obtain relation curves of bud-ssed trajectory, absolute speed of bud-seed and time. Establish mode of separation condition about bud-seed and rotating plant in the dropping process, determine the main objects are angular velocity of rotating plate, angular acceleration and motion displacement.5. Observe and analysis the motion condition of bud-seed which had been photographed in the dropping process on line by the high-speed photography. Obtain characteristics of motion of bud-seed in the dropping process, curve of motion trajectory, displacement and velocity. Contrastive analysis on dropping trajectory, displacement and velocity of De Meiya 1, Longdan 47 and Xianyu 335 bud-seed with different cam speeds. Obtain the whole process of trajectory present Peal-Reed model with more than 93.33%. Among them the motion of bud-seed is rotation with the rotating plate in the first stage. The motion of bud-seed is separating from rotating plate and dropping in the second and third stage, their trajectory present Yeild Density model with more than 0.984. Comparative analysis on trajectory, displacement, velocity and acceleration of three maize varieties at the same cam rotation rate.6. Study the test of single factor on the seedling disc offset and analyze the influence to single-seed rate, empty-seed rate, multi-seed rate, placement offset, damage rate, broken rate and determind adaptive value. According to the test study result of single factor, select two factors, bow-tray offset and cam rotation rate and design multi-factor test. The regression model about the performance index and factors were obtained by quadratic orthogonal rotary experimental design and discussed the influence regularity of different factors on performance indexes. Obtain the principal factors by regression analysis. Adopt main objective function, use equation of regression of different performance index and optimize the result, obtain the optimized factors. Through the verification test, performance index can meet the technical requirements. Comparative analysis on planting performance index of three maize varieties.