Digital Design And Optimization Of Mating Baling Machine Used In Combine Harvester

During the process of crop production,the emergence of combine harvester,makes the harvesting,threshing,cleaning complete simultaneously,and improves the efficiency of production.After United harvester finishing the homework,grain is transported back to the warehouse by grain car,but straw is abandoned in the field as waste.If we want to make the comprehensive utilization of straw come true,the biggest problem is that it is necessary to collect and bundling scattered straw in the field.As we all know,straw’s density is small,but their cost of collection,transporting and storage are relatively large.In order to simplify the process of straw’s recycling,improve its efficiency,reduce the cost of recycling,this paper has carried out the research of designing a mating baling used in combine harvester.The mating baling connects to combine to form a complete set through the way of articulated,in the process of joint harvesting operations,straw doesn’t need to fall to the ground,they are fed directly into the compression chamber to baling.In this way,the efficiency of work can be greatly improved.Leiwo Gushen LZ-2.5E3(GE25)self-propelled corn combine harvester was chosen to fit out the mating baling machine.On the basis of this,I started to design this mating straw baling machine.Using the modern design methods was to do the overall design of the mating baling.And I did the optimization design to the baling from two aspects.One was to the aim of lighting machine’s weight,the other was to reduce the vibration.The main results were as follows:(1)The overall design of a mating baling machine.I put forward the overall structure design scheme of baling machine,determined the matched type of combine harvester,and designed all parts of baling machine by considering the theoretical derivation and physical truth,specific including:drive system,feeding mechanism,compressing mechanism,bale length control mechanism and rack.In the end,I did stress analysis and just intensity of main stress components.(2)Digital design of mating baling machine.This chapter modeled for the main parts in a reasonable way and did the statics analysis in main stress components.Finally,the results showed that the stress and deformation could satisfy the requirements of design.Besides,doing interference analysis for the feeding mechanism showed that dial claw met the design requirements.In view of the crank piston mechanism,I used the combine of dynamic and static analysis,modal analysis to do combining research,As we could see from the distribution of the low order natural frequency,the results showed that it conforms to the requirements of the dynamic characteristics.(3)Experimental study of mating baling machine.Experiments showed that:straw bale density,rules bale,anti-throw rate,bundles rate and loss rate,etc,they all satisfied the standards of industry design.In addition,I also did the vibration testing of prototype under setting conditions,found out the point of the acceleration time history and the analysis of the acceleration signal processing.Compared with the vibration test results,I found that vibration near the compression mechanism is larger,and the main form of vibration was the transverse vibration.The machine’s excitation frequency is 35 Hz.(4)Improved design of the mating baling.Solving the problem of vibration,in this machine,I applied multi-body dynamics software to analysis the compression mechanism,which is the main reason of vibration in the whole machine.Compared the rule of acceleration change in model with those test points’ in vibration test,we found the difference,and the reason for this result is that we did not take the influence of baling to the whole machine into consideration.Aimed to reduce this influence,I studied on the lightweight of the mating baling.Taking the lightest mass as the optimization objective and the static stiffness of the structure as the constraint conditions,I did the optimization design of the main parts of the binding machine,such as compression mechanism and rack.Finally,the result showed that the quality of the switchboard was reduced by 11.6%and the machine’s vibration condition was well improved,meanwhile,their stress and strain were satisfied with the design requirements.