Design And Experimental Research On Chassis Of The Crawler Self-propelled Shrub Harvester

In this paper,through analyzing and studying the development status of forestry cutting machinery and equipment at home and abroad,Combining with the existing structure characteristics and design experience of forestry machinery chassis,we design a kind of crawler self-propelled harvester chassis which is suitable for Chinese shrub harvest production.From determining the overall structure of the chassis to the design calculation of the main technical parameters,as well as the design and strength check of key components,a detailed description is given and the design plan is finalized.The scheme simplifies the structure of the traditional tracked chassis "four wheels and one belt".Only the driving wheel and the supporting wheel are used for the traveling mechanism,which makes the structure of the whole machine simpler,the volume is small and exquisite,the activity is flexible,the maintenance is convenient,and the stability is high.In this paper,the driving principle and steering principle of the crawler self walking chassis are theoretically analyzed and analyzed.The linear driving performance,steering performance and slope stability are analyzed from the theoretical point of view,and then the velocity,steering radius,power loss and force condition in the actual driving and steering are studied and analysed,providing a theoretical basis for practical design and research.We use Solidworks software to make three-dimensional modeling of the components of crawler shrub harvester chassis,check the assembly patency and if there are design flaws such as interference.The three-dimensional model is the foundation of modeling for the following finite element analysis and virtual prototype analysis.With the aid of finite element analysis software ANSYS,static analysis was carried out on the key components,we can get the stress and strain nephogram and deformation nephogram,to test if the strength and rigidity of key parts can satisfy the basic requirement of design.Through modal analysis of the key parts,the vibration characteristics of the key parts are analyzed,and the resonance phenomenon can be avoided to ensure the stability and reliability of the key parts in the working process.Dynamic simulation analysis is carried out on the moving performance of the crawler's self-propelled shrub harvester on different road surfaces with the application of virtual prototype technology through ADAMS software.Before making the physical prototype,we can determine whether the motion performance of the machine can achieve the desired effect,so as to shorten the design cycle and reduce the cost.After completing the simulation analysis and determining that the crawler chassis has good motion performance,a prototype is manufactured.Then we conduct an experimental study on the overall performance of the physical prototype.The experimental results show that this machine performs well.At the same time,the correctness of the simulation analysis results are verified,we can also seek for the shortcomings in the design,and improve the design continuously.The design of the crawler self-propelled shrub harvester chassis in this paper simplifies large crawler chassis structure.The whole machine structure is more simple,can be highly efficient and flexible in the shrubs,improve the cutting efficiency,reduce labor intensity and risk,increase the utilization rate of shrubs as biomass energy and improve the current situation that small forest harvesting equipments are less in China.As a general walking chassis,it can be used in different forest environments to realize different functions and has wide applications.