Design And Experiment Of Seeding Device For Vegetable Seedling Production Line

As a tremendous country in the vegetable planting industry,the degree of agricultural mechanization in the vegetable industry determines whether country’s vegetable industry can develop healthily in the new era.The output of vegetable seedlings restricts the development of the vegetable planting industry.In order to get rid of the restriction of natural conditions on vegetable seedlings,factory seedlings have rapidly developed at home and abroad.Factory-based seedling raising refers to the method of large-scale seedling raising through mechanization and automation,mainly through the vegetable seedling production line.The current vegetable seedling production line models have low mechanization level,poor seeding effect and unable to carry out high-speed Sowing efficiency work and other issues.In addition,due to the light weight and small size of the spherical vegetable seeds,it is difficult to sow.Therefore,there is a lack of a seeding device that can meet the seeding requirements of the spherical seed.Based on the analysis of the advantages and disadvantages of the existing assembly line models and combining the physical characteristics of vegetable seeds,the paper conducts the corresponding optimization design,and designs a vegetable seedling production line that integrates the functions of covering soil,cleaning soil,pressing holes and sowing.The machine seeding efficiency is high and the seeding effect is better,and the assembly line seeding device can be suitable for spherical vegetable seeds.The specific research contents of this paper are as follows:1.Test and analysis of the physical characteristics of vegetable seeds.Since the physical properties of different vegetable seeds were different,and the physical properties of the seeds were related to the determination of the structural parameters of the vegetable seedling line planting device,it needed to be studied.Through experimental analysis,the physical characteristics of vegetable seeds such as particle size,seed bulk density,thousand-seed weight and angle of repose were obtained,which provided a theoretical basis for the design of the structural parameters of the seeding device.2.The overall scheme design of vegetable seedling production line.Clarified the working characteristics and design requirements of the vegetable seedling line,and gave the main design parameters of the line;according to the work characteristics and design requirements,compared the advantages and disadvantages of various schemes,and selected the seeding scheme and transmission scheme that could overcome the difficulties in the process of seedling raising and planting in the assembly line;finally,according to the work that the assembly line needed to complete,the whole machine structure was designed and its working principle was explained.3.The design and power calculation of the key device of vegetable seedling production line.According to the design plan of the whole machine,the structure design and parameters of each key device were determined,and their working principles were briefly described.Through analyzing the seeds of different stress stages in the seeding and discharging process of the seeding device,the influence of the diameter of the suction nozzle,the degree of vacuum,the angle of the suction nozzle characteristics and the height of the suction on the adsorption capacity of seeds were obtained.The power consumption of each key device was analyzed and calculated and the motor was selected.The Solidworks software was used to model and assemble the whole vegetable seedling assembly line.4.Simulation analysis of air flow field of vegetable seedling production line sowing device.The FLUENT software was used to simulate and analyze the air flow field on the suction nozzle on the seeding drum and the inside of the drum.Through comparing the nozzle internal velocity cloud diagram and the nozzle entrance cross-sectional velocity cloud diagram under the working conditions of various nozzle hole types,apertures and vacuum degrees,the relationship between various factors on the suction performance of the nozzle was obtained.In addition,through the simulation analysis of the air flow field,it was found that different drum speeds had little effect on the performance of the suction nozzle,indicating that the designed seeding roller could adapt to the high-speed seeding efficiency.5.Prototype manufacture and test of vegetable seedling production line.Carried out the trial production of the vegetable seedling production line prototype and the sowing test according to the test specification.Orthogonal experiment was designed to determine the primary and secondary order of the degree of influence of vacuum,nozzle aperture and nozzle hole type on the seeding effect.Through range and variance analysis,the optimal combination of factors was obtained,and the verification test was carried out under the optimal combination of factors.Verified that the performance of the designed vegetable seedling production line met the work needs,and the seeding qualification rate met the design requirements.The vegetable seedling production line designed in this paper had the functions of paving the soil,cleaning the soil,pressing holes and planting at one time,and it could adapt to the high-speed planting efficiency and the planting device of the line could meet the planting requirements of spherical seeds.The assembly line effectively solved the main problems in the seedling process of plug seedlings,improved production efficiency,and promoted cost-saving and efficiency-saving way in the vegetable seedling industry.