| The unique climatic conditions in Xinjiang lead to the adoption of film mulching drip irrigation technology for soybean planting. The planting method of soybean on film increases the difficulty of soybean harvesting by machine. The bottom pod position of soybean is low, and it is easy to produce ' Bottom pod leakage cutting ' and ' Cutting table shoveling ' due to the ups and downs of the terrain during harvesting. In view of the above problems, this study designed a soybean header with terrain fluctuation detection device. By measuring the field growth characteristics of soybeans planted in Xinjiang, the parameters of the reel wheel with a spindle length of 2000 mm and a diameter of 650 mm were determined, which were beneficial to the harvest of single film soybeans in Xinjiang. A front wheel type terrain detection device was designed, and the device was installed on both sides of the soybean header. The relationship between the angular rotation of the detection device and the terrain fluctuation was determined. The ground fluctuation detection test was carried out on the designed soybean header. The average relative errors between the actual distance and the detection distance in the test were 0.037, 0.038 and 0.039. The working principle of reel was analyzed, and the speed ratio range of grain-sweeping was studied. The three-dimensional model of the reel was imported into Adams to analyze the trajectory of the spring teeth on the reel under different reel speed ratios. It was found that when λ≤1, the reel has no reeling effect; when λ＞1, the reel has the effect of reeling; but when the reeling speed ratio is too large, there will be an overlapping area between adjacent spring teeth. The header designed in this study is beneficial to the single film harvesting of soybean in Xinjiang. The terrain detection device can provide a basis for the real-time adjustment of the header height, and has reference value for reducing the loss of soybean harvest. |