| As the world's wood resources decrease,bamboo resources are more and more valued by the advantage of short growth cycle.Bamboo pruning is the first process after bamboo felling.It has always been done by people and hand cutting.Although there are more and more machines for bamboo,there are still few machines for bamboo cutting.Therefore,a machine suitable for clumping bamboo has been designed,the machine is more suitable for the pruning operation of Sympodial bamboo in hilly and mountainous areas.The main work done is as follows:?1?Through the establishment of the pruning model,the resistance equation of the pruning model is derived,and the conclusion is that the smaller the wedge angle of the blade,the smaller the cutting resistance.Then the cutting method is analyzed,and the sliding cutting can be effectively Reduce the cutting resistance;then analyze the power consumption during the sliding cutting process and find that the sliding power consumption decreases first and then increase;then analyze the sliding cutting type to find that the equal sliding cutting edge can be effective Reduce blade vibration.Finally,the blade's motion is analyzed,and the blade's trajectory equation and the blade tip's velocity equation are obtained.?2?According to the requirements of the working performance of the clustered bamboo pruning machine and the analysis of the tree pruning structure,four structural schemes of the pruned bamboo pruning machine are constructed.In this project,the portable flexible shaft pruning bamboo pruning machine is used for design and research.The pruning machine includes three parts:backpack,transmission and hand-holding.The three parts are modeled in SolidWorks and virtual assembly is completed to detect no interference.Through the test of the shear force required to cutting bamboo branches,we know that the shear stress required to cutting bamboo branches was 20MPa.?3?Based on ABAQUS software,the cutting simulation of bamboo branches and blades was carried out,and it was verified that the force of the equal-sliding cutting blade is less than that of the linear blade.Optimize the parameters of the equal-sliding cutting edge blade,taking the three parameters of the blade wedge angle?,the number of teeth n and the sliding angle?as the factors,the horizontal change range is taken as 7,the uniform test is designed with the energy consumption as the goal,and obtained by using DPS software The second-order polynomial stepwise regression equation of the target is obtained,and the variation law of each parameter and the target value is obtained.After optimization,the three parameters of the equal-sliding cutting angle blade cutter wedge angle?,the number of teeth n and the sliding cutting angle?are 30°,respectively.2,60°,the optimized power consumption value is 5.2%lower than the original.Through the modal analysis of the transmission device,the minimum natural frequency is 89.375Hz.The frequency of the transmission device during operation is less than the minimum natural frequency,and the design will not cause resonance phenomena.The static analysis of the coupling device shows that the maximum stress and strain occur in the middle of the connection sleeve.The maximum stress of the connection sleeve at the motor end is 16.62MPa,the maximum strain is 8.549×10-5,and the maximum stress at the connection sleeve at the hand end is 7.739 MPa,the maximum strain is 3.671×10-5,which is far less than the yield strength of the material,which can better guarantee its strength at work.After completing the production of the prototype,the hand-held part of the machine is light in weight,the worker can work for a long time,and it is easy to carry.The time to complete the pruning of a kind of bamboo is about 20seconds. |
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