基于机液联合仿真的跨式油茶果收获机液压系统研究

In order to improve the working performance and reliability of the straddle Camellia oleifera harvester,it is great significance to design an appropriate and stable hydraulic system.Based on RecurDyn and AMESim software the mechanical and hydraulic system models of the straddle Camellia oleifera fruit harvester is established,and the information interface is created to achieve mechanical-hydraulic co-simulation of the entire machine.The hydraulic oil pressure and flow changes in the execution components of the chassis under straight walking,obstacle crossing,climbing,and turning conditions are analyzed by simulation.The hydraulic oil pressure and flow changes in the actuating components of the shaking mechanism under no-load and load conditions are analyzed are verified.The simulation results show that the hydraulic system of the straddle Camellia oleifera fruit harvester is valid and has good stability.Under the straight walking condition of the chassis,the flow rate in the four walking motors is stable at 30L/min and the pressure is stable at 15bar.Under obstacle crossing conditions,the pressure fluctuates inside the motor with the fluctuation range of 15-25 bar,and the pressure stabilizes subsequently.Under climbing conditions,when the chassis fully climbs up the slope,the pressure reaches the maximum value and the stable pressure value is 90bar.Under the working conditions of unilateral braking steering and bilateral differential steering,the fluctuation range of the internal pressure of the motor is 60～100bar and 20～100bar,respectively.Under the no-load working condition and load working condition of the shaking mechanism,the flow and pressure in the shaking motor change periodically in a sinusoidal wave,and the pressure varying range under load working condition is 10～40bar.The main reason that affects the flow and pressure change of the hydraulic system for shaking mechanism is the movement characteristics of the shaking mechanism itself.