Electric Tractor Electric Elevator System Design

With the increasing energy consumption and environmental pollution,new energy development and utilization have become the trend of the times.As a large agricultural country,China’s agricultural machinery brings convenience and efficiency to people,accompanied by high energy consumption and complicated structure.The new energy tractors on the market are mainly based on electric energy,and their functions are mostly limited to traction and transportation.This project is mainly aimed at the design and analysis of the key components of the national key research and development project "Electric tractor intelligent control and operation key technology research and core components development"-electric suspension system,and developed a servo electric cylinder to replace the traditional upgrade.The electric suspension system of the rod and the shaft pin type force sensor are installed at the key hinge point.When the pure electric tractor is mounted,the tillage resistance can also be measured.The main work of this thesis is summarized as follows:（1）According to the requirements of relevant projects,four kinds of electric suspension design schemes are proposed,and the structure and performance of the traditional hydraulic suspension are compared.The electric suspension system of the tractor based on servo electric cylinder is designed.（2）Simplify the suspension of each rod,and analyze the theoretical force of the four-bar linkage at the upper and lower rods respectively,establish and analyze the soil resistance model of the tillage,refer to the traditional SF354 standard rod,and select the fold-back servo for the power lifting unit.Electric cylinder and Taizhou Yichuan servo motor;also refer to JINMA354 tractor and other related system parameters to calculate and select the required shaft pin force and torque sensor.（3）Create a simple multi-body kinematics model in ADAMS and perform simulation verification.Through the theoretical analysis of the four-bar linkage mechanism composed of the lifting arm and the lowering rod,it is concluded that the main force object in the suspension system is the lifting arm.The coordinate parameters of the lifting arm end are set as variables in the ADAMS,and the suspension half is simulated and optimized.The analysis results show that the selected servo electric cylinder meets the requirements of the suspension system.The most advantageous position of the end of the lifting arm is（252.612.108）.After optimization,the maximum thrust of the single cylinder is 12020 N,and the mass of the rear mounted load is 650 KG.（4）Re-introduction of the optimized lifting arm to SolidWorks 3D modeling and introduction into ANSYS for static stress analysis.The analysis results show that the maximum stress is 112.73 MPa when the material is set to Q235,and its safety factor is 2.085.Within the range,the maximum deformation is 0.89mm,and the equivalent elastic deformation is 0.000568mm.Finally,the optimized structure meets the design requirements.（5）Build two indoor and outdoor tillage test rigs,carry out load test and underground tillage test on the outdoor test rig.The test results show that the electric suspension of the design basically meets the requirements of electric tractor farming.During the actual cultivation process,the gantry runs stably.The reliability is high,and the correctness of the theoretical analysis is also demonstrated,and the feasibility of the design scheme is further determined.