VIBRATION AND IMPACT DETECTION OF AXIAL- FLOW THRESHING UNIT UNDER DYNAMIC THRESHING CONDITIONS

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.