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In order to study the hinge points load for grader's working device, a multi-body dynamic model of the grader is established for analyzing the construction condition and obtain the load of each hinge point. The analysis method is verified by prototype test. Taking the force of the key cylinder as the optimization objective, the positions of all hinge points are optimized. The result show that the scheme reduces the maximum force of the key cylinder by 26.5%, which improve the stability of the grader.doi:10.1051/e3sconf/202019801052 fatcat:4aewckfjj5hznj2stydsw4dwg4