| Lilies are agricultural treasures with edible,medicinal and ornamental values.The planting area of lilies in China is more than 300,000 mu.The harvesting process of lily has an important influence on the quality and economic benefit of the later processing of lily.The traditional artificial harvesting can no longer meet the economic demand of lily production,so it is necessary to study the low damage and high efficiency mechanized harvesting technology and equipment of lily.For lily’s harvest mechanization research in China is less,reference underground bulb crops such as potato harvester study found that at present the crop at harvest machinery operation when the material injury problems,mainly in conveying separation as well as field laying link,and relative to the nature of the potato is more fragile,lily theory in mechanical harvest when the injury rate is relatively higher.In order to solve the above problems,this study only discussed the transportation efficiency and damage in the lily transportation process,and temporarily ignored the separation effect of fruit soil.Therefore,the operating parameters of a vibration transportation device were optimized and the optimized transportation device was trially-produced and the field experiment was conducted.The following conclusions were drawn:(1)Through field investigation,the output of lily per unit area and the size of the field chamber in Longhui lily planting base in Shaoyang were obtained.The characteristics of lily were tested and analyzed,and the physical size,moisture content,friction characteristics and density of lily were determined,which provided a basis for the subsequent design of key components and experimental design.(2)Determine the design scheme of conveying device in lily harvester.The connecting rod vibration conveying mechanism is used for conveying,and the movement state of the material on the vibration conveying plate is analyzed theoretically,and the key parameters affecting the movement state of the material are obtained: crank speed,crank length,vibration direction Angle,vibration conveying plate installation Angle,which provides the relevant basis for the subsequent tests.The above influencing factors are analyzed and the key components are adjusted.The vibration conveying test bed is designed and manufactured,which provides the hardware foundation for the subsequent test.(3)Taking lily damage rate and conveying efficiency as the evaluation index of the working performance of the vibration conveying device,the crank speed,crank length,vibration direction Angle and the installation Angle of the vibration conveying plate were selected as the test factors,and the single factor test of the influence law of each factor on the working performance of the vibration conveying device was done.In single factor experiment on the basis of the above four factors in the four factors three levels quadratic regression orthogonal experiment,established the evaluation index and the four factors,the regression mathematical model between through optimal solution and the verification experiment,obtained in the crank speed 50 rad/s,crank length 12 mm,35 °,vibrating direction Angle of vibration transmission board installation Angle is 6.5 °,The damage rate of lily is 0.197%,and the transport efficiency is 0.641kg/s.The test results meet the practical production requirements of lily harvesting.(4)The optimized vibration conveying device was applied in the field harvest test of lily,and the test results were 0.201% of lily damage rate and 0.661kg/s of conveying efficiency.The relative deviation between the field test results and bench validation test results were0.004% and 0.02% respectively,which proved that the optimized scheme was reliable and effective. |
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