Design And Experimental Study Of A Disc Sawing Test Bench For Sandy Shrubs

Sand shrub is the main vegetation for windbreak and sand fixation and desertification control in Northwest China.According to its biological characteristics,flat stubble is the main measure and key link of tending management.The cutting surface quality of sand shrub not only affects the germination rate of next year,but also reflects the mechanical properties of flat stubble.In view of the problems of poor surface quality,serious wear of circular saw blade,unsafe sawing machinery and high energy consumption caused by unreasonable working parameters in the process of stubble cutting,this paper takes Salix as the research object,on the basis of experiments,discusses the problems and solutions at this stage,so as to maximize the level of the stubble cutting machine The stubble quality and working eff-iciency can provide reference for the design of the stubble machine and the selection of sawing parameters,and play a positive role in promoting the research of the stubble machine.Based on the theory of composite material mechanics and referring to related literature,the mechanical properties of Salix were tested,and the mechanical parameters of Salix were obtained.The experimental results lay a theoretical foundation for the simulation of sawing Salix,the development of sawing test-bed and the design of high-efficiency and low-power cutting machinery.According to the design requirements of sand shrub sawing experiment,three test-bed schemes are designed by using UG NX software and modular design method.Through comparative analysis,the final design scheme and working process are determined.Using the finite element software Abaqus,through the single factor test,the saw cutting analysis of Salix is carried out.The analysis results provide the parameter basis for the saw cutting test and the finite element analysis of the key parts of the test-bed.The finite element software ANSYS Workbench is used to check the strength of the sawing spindle,and the modal analysis of the circular saw blade is carried out.The results show that both the spindle and the circular saw blade meet the requirements.Based on the study of the sawed surface of Salix,the calculation function of the comprehensive quantitative scoring value Q of the sawed surface quality of shrub was put forward.Based on the principle of computer vision and digital image processing technology,a surface quality evaluation system of shrub sawing was established,which was composed of closed darkroom,optical lighting system,industrial camera and Matlab language program.Using the self-developed disk sawing test-bed and the self-designed sawing surface quality evaluation system,the manganese steel circular saw blade with the outer diameter of(?)400mm and the inner diameter of(?)30mm,which is usually used by the large-scale shrub flat stubble machine,was selected to test the Salix with the moisture content of 9%?10%and the diameter of(?)40mm.Based on the Box-Behnken center combination method,the Design expert software was used to establish the multiple mathematical regression model with the saw speed,feed speed and the number of saw teeth as the influencing factors,and the saw power and the scoring value of saw surface quality as the objective function.The results show that the significant order of the influence of sawing power is sawing speed,feed speed and number of saw teeth in turn;the significant order of the scoring value of sawing surface quality is feed rate,sawing speed and number of saw teeth in turn;the optimal combination of working parameters is sawing speed of 1605rpm,feed speed of 10.4mm/s and number of teeth of 100T.Through the verification of the optimized mathematical model and results,the relative error is less than 5%,and the reliability of the model is high.