Experimental Research And Parameters Optimization On Burdock Harvester

Burdock as a typical long root Chinese herbal medicine had very huge development potential both as medicine and food. Even in today, the most popular way for burdock harvest still relied on people’s hands; digging, laying and picking. In order to extend the burdock cultivated area, improved harvest efficiency, increased medicinal herb grower income, to establish a machine for burdock harvest became very significance.This investigation was based on the current harvest situation studies of the root crops in domestic and overseas the harvesting methods as we known; confirmed the burdock harvest agricultural technology requirements; furthermore, analysis the major impact problems and correspondingly the taken technical measures were pointed out. This article determined the burdock harvester design goal was based on the analysis results, and thorough study was carried out for technology process and working principle of burdock harvester vibration digging shovel. Through development of relationship of burdock harvester working resistance and affect factors, three-dimensional modeling and FEM analyzing, modal experimenting and theory analyzing the following conclusions were made.1. This article presented the further development trend of burdock market, and showed various products from burdock. Base on the nature of burdock growing situation, the whole structure of burdock harvester was set up, and several technical issues were established. Face to the main parts of the harvester, the vibration system and digging system were designed based on the vibration decrease resistance theory; and the harvester presented anther harvester method for root crops, also for further reference. The three-dimensional model of each component is established and assembled by Solidworks2012, and prototype was manufactured. The test in field shown that each part of the machine was reliable, the harvester was effective, and the main performance index was better than the harvester machinery provision.2. In order to determine the interaction between traction peak resistance and burdock harvester vibration cultivator shovel designed parameters, the scarification experiment was conducted by using the eccentric wheel vibration device. The two times orthogonal rotational regressive tests were designed in the experiment that:harvester working frequency, velocity, and amplitude as three input parameters; traction peak resistance as output parameter. The regression mathematics model between output parameter and input parameters were established. The result analyzed that the model was fitting, and weighted order was harvester frequency, amplitude and working velocity. By using the MATLAB software, there were three curve-models present the interaction between those parameters. Moreover, the result of programming solver showed that optimized parameters which were frequency 9.398 Hz, velocity 0.705m/s, and amplitude 8.67mm; matched the lowest traction peak resistance 12.446kN, and these results offered a reference basis for re-design burdock harvester optimizing parameters.3. Three-dimensional model was established for developed burdock harvester, and main parts of the harvester were analyzed with FEM. The stress, strain and torsion of the shovel at max working load was analyzed and illustrated. The first five modals and scale factors of main parts of the harvester were analyzed. The modal animation of each modal was made by the same time. The harvester was modified according to the FEM analysis results; moreover the harvester was more suitable for the practice working situation.4. The modal experiment of burdock harvester was conducted, and its modal mode and damping ratio were analyzed by data acquisition and analysis software. The experiment result proved the FEM modal’s validity and provided the vibrating parameters of main bodies which would be the basis of dynamic optimization design and improvement of the vibrating system of the harvester. The self-power spectral density of typical position in the harvester was analyzed, and the typical frequencies were determined. The vibrating acceleration of typical position on vibrating shovel was measured and analyzed which provided basis for reducing the working resistance of the harvester.The study methods and conclusions had theoretical significance and practical value for designing and developing burdock harvester which reduced working resistance, improved efficiency and saved energy.