Simulation And Experimental Study On Cutting Process Of Header Of Whole Stalk Sugarcane Harvester

The important link of sugarcane harvest is the cutting of sugarcane stalk,and the cutter is one of the important components of sugarcane harvester.The cutting performance of sugarcane stalk cutter determines the popularization of sugarcane harvester and the acceptance of sugarcane farmers.The important indicators to measure the cutting performance of the sugarcane cutter are the working power and cutting quality.The working parameters(cutter head speed and forward speed)and structural parameters(cutter head edge angle and cutter head inclination)of the cutter are the key influencing factors.Reducing the harvesting power of the sugarcane harvester,improving the cutting quality,reducing the maintenance cost of the cutter and improving the working efficiency are the important theoretical design basis of the cutter of the sugarcane harvester.Therefore,this thesis mainly does the following research:(1)The mechanical parameters of sugarcane stem were measured by universal testing machine.Through the shear test and tensile test of sugarcane stem,the maximum shear failure force of sugarcane stem was 934.89 MPa and the elastic modulus was 996.8 MPa.The volume of sugarcane segment was measured by immersion method,and the tissue density of sugarcane stem was1022.9 kg/m~3 and Poisson’s ratio was 0.3.(2)According to the principle of power detection,using Labview software,combined with the hardware platform composed of USB-6008 data acquisition card,torque sensor module,speed sensor and collector ring,a cutter cutting power detection device is designed.The cutting power of the harvester is indirectly obtained by measuring the rotating shaft torque and rotating shaft speed.(3)In order to intuitively understand the change law of cutting force and energy in the cutting process of sugarcane,this thesis uses Solid Works to draw the cutting model,uses LS-Prepost software and ANSYS/LS-dyna solver to simulate and analyze the sugarcane cutting model,intuitively obtains the fracture of sugarcane in the action process of the cutter,and obtains the tear of sugarcane skin and the change law of cutting force under different edge angles.Under any condition,the cutting force of sugarcane stalk first increases and then decreases with the increase of action time,and the cutting energy gradually increases with the increase of time,and finally tends to be stable.(4)Taking the cutting force per unit area and cutting power per unit area as the test indexes,the parameters such as cutter head speed,cutter edge angle,cutter forward speed and cutter head inclination are analyzed by single factor test respectively,the parameter range is determined,and the multi factor test scheme is designed.The cutting test is simulated by using the designed cutting power acquisition device and cutting test-bed,and the analysis of variance is carried out.The results show that the influence of cutting edge angle and cutter head inclination on cutting force per unit area is very significant.The influence of various factors on cutting force per unit area is cutter head inclination,cutting edge angle,cutter head speed and cutter forward speed from large to small.The influence of cutter head speed on cutting power per unit area is very significant,and the influence of cutter head inclination and cutter forward speed on cutting power per unit area is significant.The influence of various factors on cutting power per unit area is cutter head speed,cutter head inclination,cutter forward speed and cutter edge angle in order.The Optimization module of Design-Expert is used to optimize the regression model.The optimized parameters are as follows:the inclination angle of the cutter head is 12.3°,the rotation speed of the cutter head is 626 r/min,the forward speed of the machine is 0.416 m/s,and the blade edge angle is 21°.Under the same structural and working parameters,the cutting force per unit area and cutting power per unit area are 1.812 N/mm~2and 1.522 W/mm~2 respectively.The cutting force per unit area and cutting power per unit area are 2.118 N/mm~2 and 1.683 W/mm~2 respectively.The results show that the soil has a great influence on the cutting force and cutting power of the cutter.When the cutter is not in contact with the soil,the cutting force and cutting power per unit area are reduced by 14.45%and 9.57%respectively.