| China has become the most important producer and exporter of the processing tomato industry in theworld, and Xinjiang has become the largest processing tomato planting and processing base with its uniquegeographical advantages and climatic conditions in China. However, as the pillar industry in the productionand processing of Agricultural Products in Xinjiang, processing tomato industry has played an importantrole in the promotion of farmers’ income, attracting urban and rural employment and promoting newindustrialization processes, etc. The processing tomato industry is known as the ‘red industry’ leader inXinjiang. At present, the degree of mechanization of the tomato harvest is in the growing popularity andimproved in China, but the information of distribution difference of tomato production cannot be getthrough real-time yield monitor during tomato harvest has become one of the problems to be solved. Onthe other hand, the researching time on the ‘precision agriculture’ is very short in China. So thedevelopment of yield monitor system of crop is still in its infancy, and the application and the research oftechnology on the tomato harvest yield monitor is still vacant. Therefore, a yield monitor device on tomatoharvester is need to be designed to solve the problem that yield monitor cannot be done in real time. On onehand, the device can make the process of yield monitor during tomato harvest realize automated,intelligently and informationized. On the other hand, it provides a theoretical basis for the further researchof tomato harvester monitoring technology.Based on guaranteeing the dynamic weighing accuracy of yield monitor device on tomato harvester, amethod that program design, theoretical analysis, computer-aided design, computer simulation andexperimental analysis were combined was used to complete designing the structure of device and acomprehensive analysis on factors impacting the weighing accuracy. The specific contents are as follows.(1) The specific program of yield monitor device on tomato harvester was designed from designprinciples, main features, technical requirements and the structure design of yield monitor device. Then theweighing principle and mechanical model of the device were analyzed and appropriate data algorithm wasselected to eliminate vibration so as to improve the dynamic weighing accuracy during weighing.(2) Based on the structural characteristics and the theoretical results of the device, following theprinciple of the actual selection of parts, considering the economic and practical issues and in order toimprove the weighing accuracy of the device at last, the key parts of the yield monitor device on tomatoharvester were selected reasonably.(3) The digital modeling, the virtual assembly and interference checking of the various parts of theyield monitor device could be completed by software Solidworks. Then the motion simulation analysis oftomato could be completed by modules Motion of software Solidworks.However, the critical conditionsthat the tomato’s relative rolling backwards occured before getting into the effectively segment of weighingbelt but without leaving it and the tomato’s relative rolling didn’t occur when getting into the effectivelysegment could be determined to prepare for setting up yield monitor device indoor test rig and completingdynamic weighing test next.(4)The dynamic weighing test was finished by orthogonal experiment on test rig. Firstly, the testresults were done analysis of variance. Secondly, various factors influencing the weighing accuracy indynamic weighing were determined by software Minitab and mathematical models between the weighingaccuracy and each factor was established. Then the optimization parameters were completely analyzed andthe confirmatory test was done at last. The results shows that the optimal parameter combinationsinfluencing the dynamic weighing accuracy is as follows: the speed of the weighing belt is 1.00m/s, thesurface shape of weighing belt is uniform size square and the supplying of material(tomato) is 50 kg. |
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