Design And Experimental Study On The Seedlings Mechanism Of Corn Breeding And Transplanting Machine

Breeding and transplanting technology can make corn in the cold area of China,avoid damage caused by low temperature freezing damage in early spring,improve corn yield and quality,and reduce labor intensity through mechanization,promote early harvest,high yield and loss,and obtain Significant economic benefits.The foreign breeding transplanting machine realizes automatic operation through visual recognition and automatic control technology such as hydraulic and pneumatic,and the domestically developed breeding and transplanting machine has low automation and labor intensity.In view of the problems of manual seedlings,seedlings and labor intensity in domestic semi-automatic transplanting machines,this paper analyzes the performance of self-developed biomass seedling trays and designs a corn borer through theoretical analysis and experimental research.The automatic feeding and seedling mechanism of the transplanting machine is used to determine the order of factors affecting the effect of seedlings and the optimal combination of parameters.(1)Study on performance of biomass pot seedling tray.Through seedling raising experiment and cutting experiment,the morphological characteristic parameters of biomass bowl seedling tray before and after seedling raising and the water content when it satisfies the transplanting condition were determined.The bowl tray was cut by bending,tangential cutting,shearing and sliding cutting,and the best cutting method of biomass bowl seedling tray was determined by evaluating the integrity and Seedling injury rate of the bowl tray.The design of seedling supply and seedling separation mechanism of biomass bowl seedling cultivation has laid a theoretical foundation.(2)Design and Rationality Testing of Planting Mechanism for Supplying and Separating SeedlingsThrough theoretical analysis and calculation,the overall structure of seedling-feeding and seedling-planting mechanism was designed.According to the characteristics of biomass seedling-raising tray,special seedling-feeding and transmission mechanism was designed.By determining the size parameters of the corresponding parts of each mechanism,appropriate sensors and electric components were selected.According to the agronomic requirements of seedling-raising and transplanting,the three-dimensional modeling of the whole machine was simulated and analyzed.The rationality of the design of inspection mechanism and parts.(3)Experimental study on the performance of seedling-feeding and seedling-planting mechanismAccording to the simulation results,the prototype of the test-bed was manufactured,and the main factors affecting the qualifications of pot seedling segmentation were determined according to the analysis of agronomic requirements and working principles.The level of each factor was determined by single factor test,and the quadratic regression orthogonal rotation test was carried out.The mathematical model between the qualifications of pot seedling segmentation and the influencing factors was established,and the interaction between each factor and the influencing factors was determined.The optimum combination of parameters was determined,that is,the rotation speed of cutter is 175 r/min,the inclination angle of track feeding seedling is 40 o,and the traveling speed of electric push rod is 33 mm/s.The main and secondary order of influence factors was determined as follows: the inclination angle of feeding seedling track > the traveling speed of electric push rod > the rotating speed of cutter after parameter optimization.The validation test showed that the qualified rate of pot seedling segmentation and the theoretical error were less than 5% after parameter optimization.