山地农机行走装置电控负载敏感系统性能分析

Performance Analysis of Electronic Control Load-sensing System of Mountain Agricultural Machinery Walking Device

针对目前液压油压力反馈式负载敏感系统响应速度慢、精度低,以及山地农机作业时的适应性问题,设计了一套电控负载敏感山地农机行走装置液压系统。在分析所设计系统工作原理基础上,采用AMESim搭建其仿真模型,研究其在启动、匀速、停止、爬坡、转向等作业工况以及流量饱和工况下的工作特性。通过仿真可知,所设计的电控负载敏感山地农机行走装置系统能按照各种工况要求实现指定动作,且系统中液压马达转速仅与对应的多路阀阀口开度有关,与所受外负载无关,系统运行稳定、操作性强。当系统出现流量饱和工况时,泵输出的流量会根据液压马达对应多路阀阀口开度等比例分配流量,使各个机构可以独立工作、互不干扰。所设计的电控负载敏感系统能够满足山地农机行走装置各种工作需求。

Aimed at the slow response speed and low accuracy of the current hydraulic oil pressure feedback load sensitive system,as well as the adaptability problems of mountain agricultural machinery during mountain operations,a set of electric control load-sensing mountain agricultural machinery walking device hydraulic system has been designed.Based on the analysis of the working principle of the designed system,a simulation model was built using AMESim to study its working characteristics under operating conditions such as starting,uniform speed,stopping,climbing,turning,and flow saturation.Through simulation the designed electric control load-sensing mountain agricultural machinery walking device system can achieve specified actions according to various working conditions,and the hydraulic motor speed in the system is only related to the opening of the corresponding multi-way valve,independent of external loads.The system runs stably and has strong operability.When the system experiences a flow saturation condition,the pump output flow will be proportionally distributed based on the valve opening of the corresponding multi-way valve of the hydraulic motor,so that each mechanism can work independently without interfering with each other.It can be concluded that the designed electronic control load-sensing system can meet various working requirements of the walking device of mountain agricultural machinery.