The number of automobile is increasing rapidly as the national economy develops. As a result, the incidence of traffic accident and disorderly parking also increases .Especially on the busy streets, limited space lead to higher probability of this phenomenon. The role of the wrecker is to destroy the vehicle or illegal vehicles dragged off to ensure that the road is smooth.Nowadays, the second class chassis is used in wrecker .As a result of volume is larger, which can not apply to all the conditions. Such as can not timely rescue when traffic congestion occur. In order to achieve timely road rescue, small cars for the traction device of small wreckers have emerged. Scissors wrecker device designed in this paper, main apply to cleaning up small fault vehicles and peccancy vehicles on the road, this device light quality, compact size and small volume.Designed scissor wrecker device based on actual need and also were inspired by scissor lift. The advantages and disadvantages of three modes of vertical drive,horizontal drive and double hinge drive are compared and analyzed. The driving mode of the scissor lift mechanism is determined . The main components of the scissor wrecker device are designed and modeled. The mathematical model of the lifting mechanism is established, and the movement and force analysis are carried out, which provides the theoretical basis for its optimal design. The maneuverability and dynamic analysis of the scissors wrecker device provide a research direction for its performance improvement. Simplify scissor lifting mechanism for parametric optimization by Adams, which not only optimize the structure of the scissor lifting mechanism but also reduce energy consumption of hydraulic system. On the basis of optimized model , the dynamic property of scissors wrecker device was analyzed,and the optimum project of control function was acquired, which reduced the hydraulic cylinder motion vibration in the late . The transient dynamic analysis of scissor wrecker device was performed in ANSYS Workbench , and verified the safety of main component design. Using ANSYS Workbench carry out static finite element analysis of chassis frame and towing bracket. The topology optimization of the chassis frame and towing bracket were carried out, which make them quality loss under the meet the requirements of strength. The multi-objective optimization of towing bracket was also carried out , and strength and stiffness of the frame are improved. Finally, overall model of tractor-scissors wrecker device-towed vehicle was established by Adams ,then the uniform speed, acceleration, steering and turning were simulated ,which verified the vehicle driving stability and safety in the process. |