推摇式油茶果采摘机构液压系统动态特性研究

Research on dynamic characteristics of hydraulic system of push-swing picking mechanism for camellia oleifera fruit

为实现油茶果采摘机械化,文中自主研发了一款推摇式油茶果采摘机。介绍了该油茶果采摘机构的结构和工作原理,设计了油茶果采摘机构的液压系统原理图,并以采摘机构液压系统中的振动回路为研究对象建立数学模型并进行参数计算,采用AMESim软件进行建模仿真。结果表明:振动回路系统稳定流量为100 L/min,对应马达稳定转速为1700 r/min,振动马达工作压力为6.5 MPa,输出转矩为60 N·m,满足推摇式油茶果采摘机构的作业要求,且当原动机转速在1500~2500 r/min范围时,转速越高,振动马达振荡环节波动幅值越小,其超调量也越小,系统更加稳定,最小超调量为0.75%。

In this article,in order to realize mechanization of picking camellia oleifera fruit,efforts are made to independently develop a push-swing picking mechanism.The structure and working principle of the picking mechanism for camellia oleifera fruit are introduced,and its hydraulic system's schematic diagram is designed.Then,with the focus on the vibration circuit in the hydraulic system,the mathematical model is set up;the parameters are calculated,and the AMESim software is used for modeling and simulation.The simulation results show that the stable flow rate of the vibration loop system is 100 L/min,the corresponding motor's stable speed is 1700 r/min,the working pressure of the vibration motor is 6.5 MPa,and the output torque is 60 N·m,which meets the operating requirements of the push-swing picking mechanism for camellia oleifera fruit.With the speed in the range of 1500~2500 r/min,the higher the speed is,the smaller the amplitude of the vibrating motor's oscillation link will be,with smaller overshoot(the minimum of 0.75%)and more stable system.