| The edible rose industry has a very broad development prospect in Yunnan.According to the data of Yunnan Provincial Department of Agriculture,since 2012,the planting area of edible roses in our province has increased from 12,000 mu to over 50,000 mu,and the economic benefit is close to 300 million yuan per year.After the end of the edible rose harvest every year.It is necessary to trim the branches of the rose plant surface above 50cm from the ground to achieve the purpose of renewing and strengthening the plant in the coming year.However,due to the fact that plate area is located in the Yunnan-Guizhou Plateau,the field environment is complex and varied,and the consumption of rose flowers is dense and the branches are entangled.The existing pruning machinery cannot effectively prune edible roses.Based on the study of the physical and mechanical properties and chemical components of rose stalks,a rose pruning machine was designs and trials that integrates branches,cuts,recycles and bundles through theoretical and simulation analysis.And conducted a field test on the whole machine.This project relies on the horizontal project of Yunnan Jiahua Food Co.,Ltd.and Faculty of Agriculture&Food,Kunming University of Science and Technology.The specific research contents and conclusions are as follows:?1?Samples of rose stalks were collected in the experimental field,and the physical,mechanical properties and chemical components of the rose stalks were tested and tested.It can be seen from the experiment that the rose plant has an average height of 165.6cm and a density of 0.344g·cm-3.The tensile strength of rose stalk is 12.346MPa,the elastic modulus is677.847MPa,the shear strength is 8.944MPa,the flexural strength is 28.131MPa,the fracture deflection is 14.67N,and the flexural modulus is 125.619MPa.The content of cellulose,hemicellulose and lignin in rose stalks varied from 23.09%to 48.45%,10.91%to 24.06%,and6.54%to 20.85%in three different conditions:fresh,semi-dry and dry.?2?Three different cutting schemes for single disc cutter,double disc cutter and reciprocating cutter were proposed for the cutting method of rose pruning machine.The sixth-order modal analysis of the tool was performed using ANSYS/Workbench.The meshing and material properties of the cutting model were defined using Hypermesh finite element pre-processing software,and then solved by the LS-DYNA solver.The maximum equivalent stresses of single disc cutter,double disc cutter and reciprocating cutter in cutting rose stalk are 59.91MPa,69.98MPa and 67.76MPa respectively.The maximum combined force required for cutting the branches by three kinds of tools is 468.16N,843.63N and 558.33N respectively.The comprehensive analysis and simulation results show that the single disc rotary cutting method has the best cutting effect.?3?Aiming at the problems of low efficiency of pruning operation and difficulty in recycling branches of edible roses in Yunnan,an edible rose pruning machine was developed through the design of the frame,cutting mechanism,branching mechanism and baling recovery device.It can realize the branching,shearing and recycling of rose stalks of different heights,and trial production of the whole machine in the school engineering training center.?4?The field orthogonal tests of the whole machine show that the best cutting parameters of the rose pruning machine are 6 cutting blades,the cutting speed of the cutter head is 2000r·min-1,the cutting angle is 20°,and the cutting edge inclination is 10°,the forward speed of the whole machine is 0.5 m/s.The average cutting rate and tearing rate of the cut rose branches of the whole machine were 5.68%and 3.72%,respectively,and the average pass rate was90.6%.The working effect was in line with the agronomic requirements of edible rose pruning. |
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