Abstract
In order to reveal the reason of stem cutting in rice harvesting by combine harvester front header, stem cutting principle of the front header was developed. Based on the structural models and the parameters of each part of header, the first eight-order constrained modal simulation analysis was carried out to obtain the vibration response frequency. The front header was produced and used to be tested for restraint experimental modal in the rice field. The rice stem cutting state of the header cutter was analyzed by carrying out the vibration test of the no-load rotation state and rice harvesting state in the field. According to the cutting diagram of the stalk in the header, the angle of the cutting surface and length distribution of the short stalk were analyzed with compound state of forward and vertical vibration. The results showed the mean and variance amplitude of front header were similar to length distribution of the short stalk. The mean length 23.60 mm of the repeatedly cut stems was inextricably linked to the up and down vibration amplitude 25.36 mm of the header. The stem cutting surface angles 38°, 44°, and 62° were for different forward speed and cutting areas on the cutting diagram. The above studies reveal the intrinsic nature between header vibration and length distribution of the cutting stem.
Highlights
For the vibration and imbalance problems of the harvester header, the dynamics simulation of the header of the small combine harvester was carried out by Kong et al [11]
Li et al established a three-dimensional model of the 4LZ-2.0 rice-wheat combine harvester header frame in Solidworks and introduced the model into the ABAQUS finite element analysis software to establish a finite element model [13]. rough the analysis of the modal parameters, the vibration form of the header frame and the weak link of the structure under the excitation frequency were obtained [14]. ere were much more studies focused on cutter bar of header
In order to reduce the vibration of the header in harvesting, Li et al established a threedimensional model and performed a finite element modal analysis of the header and bridge of the combine harvester [16]
Summary
E front header of rice combine harvester consists of header platform, cutting bar, combine auger, pentagon reel, and conveying house. E header platform was the skeleton and base that bore the loads of pentagon reel, cutting bar, and combine auger. E frame bore the loads of pentagon reel, cutting bar, and combine auger. Based on the above design and parameters, the header platform, cutting bar, combine auger, pentagon reel, and conveying chain were assembled. Front header was an assembly device with header platform, cutting bar, combine auger, pentagon reel, and conveying device. According to the model of header platform, cutting bar, combine auger, pentagon reel, and conveying chain, the front header physical map was processed. E vibration of the Point 1 (P1) and Point 2 (P2) represented the cutter bar cutting the rice stem when the header vibrated.
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