Dynamics Performance Of The Peanut Harvester Frame

The peanut growing areas in our country gradually increase, and the mechanization of the peanut planting and harvesting is in the promotion. Similar to other agricultural machinery, the operating characteristics of the peanut harvester are fieldwork, poor working conditions, the complex situation, many working parts, and many motion mechanisms, which inevitably produce vibration and noise, and even resonance. These problems accelerate the machine damaged and become the main reason for shortening the service life of the machine. The frame, as the important part of peanut harvester, connects and arranges various working parts in the upper, and connects the walking wheel and track at the below. Moreover, it suffers complicated stress from various parts of the machine. The frame must meet high dynamic performance requirements. Therefore, based on the actual situation according to the excitation source the dynamic performance of frame is studied in this paper.At first as the driving part of vibrating screen the fatigue strength and service life of the crankshaft is analyzed and calculated with the statics method.Secondly, the solid model of 3D is meshed with the finite element software. The inertia moment of the engine is measured based on the experiments, and it is simplified into quality point during the theoretical calculation. The natural frequency of the frame is analyzed with the modal analysis method, and according to the numerical value of the first sixth order the frame stiffness and the reasonable test frequency are determined. The modal frequency table of the frame is obtained. By changing the size of the frame structure or parts, the excitation ranges of the excitation source such as the engine and vibration sieve are avoided.Thirdly, the transfer function of the frame is determined by using the method of frequency response. The frequency response curves are obtained under the common excitation of the engine and vibration sieve. The analysis results become closer to the experimental results by modifying the stiffness value of the theoretical model for the rubber block. In order to control the vibration of the structure of peanut harvester frame and the size and stiffness of the rubber block are analyzed. Through repeated optimization design, calculation and experimental verification the transmission of vibration energy is effectively reduced or prevented, and finally the dynamic performance of the frame is improved.With the application of the research work, the frame of peanut harvester can effectively avoid the resonance region of the normal working frequency, and the interaction vibration of the excitation source on the frame is reduced. The influence of the vibration reaches to the minimum value, and the service life of the machine is improved.