Design And Experiment Of A New Type Picker Roller Structure Based On Vibration Ear Picking

In view of the problems of large ear gnawing and serious grain crushing in the current corn harvest,taking the idea of reducing the continuous contact between the ear picking roller and the ear,a new ear picking roller was designed based on the principle of vibration ear picking.The better ear picking parameter combination of the new ear picking roller was determined by the combination of theoretical analysis and bench test.The structure of the ear picking roller was optimized according to the bench test results,and the field test was carried out,The rationality and adaptability of the new ear picking roller designed in this study were verified.This thesis focuses on the following aspects:(1)Taking the whole plant of corn with ears as the research object,the basic morphological parameters of corn plant were measured,the bending test of corn stalk was carried out,and the minimum bending angle of corn stalk was determined,which provided data support for the design of key parameters and the determination of configuration mode of new ear picking roller.(2)Based on the concept of reducing the continuous contact between the ear picking roller and the ear,combined with the ear picking principle of vibration separation of stem and ear,the waveform structure of vibration wave was determined,the stress of ear and stalk under the action of vibration force was studied,and the vibration ear picking theory was determined in combination with the fruit stem separation conditions,which put forward a theoretical basis for the structural design of the new ear picking roller.(3)Guided by the vibration picking theory,the shape structure of the new picking roller was determined according to the structure of the vibration wave.Combined with the design principle of the picking roller,the key parameters such as long diameter,short diameter and length of the new picking roller were determined.The gap variation law of the new picking roller was studied by analytical method.It was proved that the shape structure parameters of the picking roller were the main factors affecting the stability of stem clamping.(4)The vibration ear picking test-bed was built,and the bench test was carried out with the ratio of the long and short diameter of the ear picking roller,the diameter of the base circle and the rotation speed of the ear picking roller as the test factors.In view of the instability of the new ear picking roller in grasping the stalk in the bench test,the structure of the new ear picking roller was optimized and verified by increasing the surface friction coefficient of the ear picking roller,and the better parameter combination of the new ear picking roller was determined,The feasibility of the new ear picking roller was proved.(5)After the establishment of exciting panicle picking test bed and bench test,a three factor and three level field test based on box Behnken was carried out.The quadratic regression and response surface analysis were used to analyze the test results,investigate the significance of each test factor,analyze the interaction law of each factor,obtain the best parameter combination by establishing the optimization model and constructing the objective function,and carry out the verification test under this test condition.The results showed that when the ratio of length to diameter of the stripping roller was 0.7 and the rotating speed was 991.496 r / min,When the forward speed of the machine was 3.22 km / h,the ear gnawing rate was 1.012% and the harvest loss rate was 1.166%,which proved the reliability of the optimization model and the adaptability of the new ear picking roller structure.