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In order to explore the interaction between the axial-flow threshing unit and the agricultural materials, the vibration signal of the axial-flow threshing unit and the stress signal of the internal threshing tooth under the dynamic threshing condition were detected by using the three-way acceleration sensors and the resistance strain gauges. The results show that under the dynamic threshing condition, the amplitude of the vibration signal along the axial direction of the threshing unit experienced a small change, but changed greatly at the feeding direction of materials and vertical direction of fixed bearings, which was mainly caused by the internal impact between the threshing unit and the materials; Under the impact of materials, the threshing element of each measuring point has a continuous peak value of stress signal, and the stress signals gradually decreased along the axial direction. This study further reveals the interaction mechanism between axial-flow threshing unit and materials from the perspective of vibration and impact, and provides new methods for the development of condition detection technology of grain harvesting equipment.

Three-dimensional interconnected porous graphitic carbon materials are synthesized via a combination of graphitization and activation process with rice straw as the carbon source. The physicochemical properties of the three-dimensional interconnected porous graphitic carbon materials are characterized by Nitrogen adsorption/desorption, Fourier-transform infrared spectroscopy, X-ray diffraction, Raman spectroscopy, Scanning electron microscopy and Transmission electron microscopy. The results demonstrate that the as-prepared carbon is a high surface area carbon material (a specific surface area of 3333 m2 g−1 with abundant mesoporous and microporous structures). And it exhibits superb performance in symmetric double layer capacitors with a high specific capacitance of 400 F g−1 at a current density of 0.1 A g−1, good rate performance with 312 F g−1 under a current density of 5 A g−1 and favorable cycle stability with 6.4% loss after 10000 cycles at a current density of 5 A g−1 in the aqueous electrolyte of 6M KOH. Thus, rice straw is a promising carbon source for fabricating inexpensive, sustainable and high performance supercapacitors' electrode materials.