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¡¡¡¡¹Ø¼ü´Ê£º°ÙºÏÁÛ¾¥£»ÊÕ»ñ×°Ö㻲ÎÊýÉè¼Æ£»·ÂÕæ·ÖÎö£»ÊÔÑéÑо¿

Abstract

¡¡¡¡At present, lily bulbs in China are mainly harvested by manual excavation and machineryof other tuber crops. With the continuous expansion of the scale of lily industry, the problemsof high cost and low efficiency of manual excavation gradually stand out. At the same time, thephysical and mechanical parameters of other tuber crops and lily bulbs are different, otherharvesters are not suitable for lily bulbs harvesting. The main problem is that the separation ofsoil and bulbs is not complete, resulting in low picking efficiency. Therefore, this paper carriedout the research of lily bulbs harvester, though considering the physical and mechanicalproperties of soil and lily bulbs, which solved effectively the separation of lily bulbs and soil.

¡¡¡¡This paper provides another idea for the design of the harvester of bulbs.

¡¡¡¡The main contents of this paper are as follows:

¡¡¡¡£¨1£© Reviewed related literature about tuber crops harvester at home and abroad, determinedthe structural scheme of the whole machine. Analyzed of the research on the digging device oftuber crops at home and abroad, designed the digging shovel. Compared the characteristics ofthe conveying and separating device for rhizome crops, determined the conveying andseparating device as the shaking screen type, the elevator is the rod type elevator, and theshaking wheel is the double head type . Calculated the power consumption, confirmed thematching power.

¡¡¡¡£¨2£© Measured and analyzed the physical parameters of soil and lily bulb, including soiltexture, soil moisture content, soil density, bulb size, density, rolling friction coefficient betweenbulb and 65Mn material plate, and bulb coefficient of restitution, which provided the theoreticalbasis of each parameter.

¡¡¡¡£¨3£© Carried out the static stress analysis of the key parts of the harvester by SolidWorkssoftware, including the frame, digging shovel and elevator drive shaft. Compared the maximumstress value with the material yield strength, analyzed the minimum safety factor and maximumdeformation to ensure that the key parts meet the normal working requirements.

¡¡¡¡£¨4£© Built up soil-lily bulbs-digging shovel-separation parts model by EDEM, and thesimplified machine model, the main working parameters affecting the harvesting efficiency,such as the forward speed of the machine, the linear speed of the elevator and the angle of theelevator, were tested by single factor. Analyzed the average normal force of the bulb and thecollision times between the bulb and the soil and the rod, obtained the factor level of higherwork efficiency, which provides the reference for working parameter optimization.

¡¡¡¡£¨5£© On the basis of the simulation test, optimized the working parameters though the threefactors and three levels rotation combination test, with the loss rate and the stem damage rateas the test indexes. Finally, the optimal working parameters combination was determined as theforward speed of the machine was 1.4m/s, the linear speed of the elevator was 1.8m/s, and theelevator inclination angle was 25 °¡£ The lily bulbs loss rate was 2.31%, and the stem injury ratewas 1.82%. The results show that the optimization results are similar to the experimental results.

¡¡¡¡Key words: Lily Bulbs; Harvesting Device; Parameter Design; Simulation Analysis;Experimental Study

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