Compared with the two extreme positions of the scissor arm of the self-propelled mobile scissor lift, the initial lifting position and the highest lifting position of the scissor arm are subjected to the largest stress, and the maximum stress occurs in the lowermost layer of the scissor extension structure. Close to the hinged hole of the lifter hydraulic cylinder leg, it indicates that the driving force of the lifting hydraulic cylinder has a greater influence on the strength of the scissor arm, and the driving force of the lifting hydraulic cylinder at the initial position of lifting is greater than that of other positions during the lifting process. The stress concentration and maximum fatigue damage of the scissor arm appear at the same hinge hole of the scissor arm at the initial position of lifting, indicating that the stress concentration has a greater impact on the fatigue life of the scissor arm, and it also indirectly indicates the drive of the lift hydraulic cylinder. Force has a greater influence on the fatigue life of the scissor arm.
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