Authors

Abstract

In view of the problems of the output power and operation, when the multi-function machine in hilly and mountainous areas driving in the field, the hydraulic control drive system of small multi-function agricultural hydraulic chassis is designed. The key components of the hydraulic drive system were selected and matched. The hydraulic system simulation model was established in AMESim simulation analysis software, and the dynamic analysis of the hydraulic system operation under different conditions is carried out. The simulation analysis results show that the hydraulic system has a large impact and vibration when it is started instantaneously, and the hydraulic system has smaller impact and vibration when it is started stably. It is consistent with the actual working state of the hydraulic chassis. Under the two starting controls, the maximum flow of the hydraulic pump is 50L/min, the motor torque is about 440N • m, and the motor stable pressure is 6Mpa, the motor speed is 96 r/min, which is within the bearing range of the hydraulic components. The simulation output parameters are basically consistent with the theoretical calculation results, and meeting the design requirements. The chassis performance test results show that the maximum crossing height of the chassis is 200mm, the crossing width is 300mm, the maximum deviation of high-speed straight driving is 2.57m, it can stably pass 20° slope, and the operation is stable and the steering is flexible. All performance parameters can better meet the requirements of chassis operation in hilly and mountainous areas.

Abstract in Chinese

针对丘陵山地多功能作业机在田间行驶中在输出动力及操作中存在的问题，设计了一种履带式小型多功能农用液压底盘的液压控制驱动系统。对液压驱动系统关键元件进行了选型与参数匹配，利用AMESim仿真分析软件建立了液压系统仿真模型，对不同条件下液压系统作业状况进行了动态分析，仿真分析结果可知，瞬时启动时，液压系统有较大冲击及震荡，稳定启动时，液压系统波动小、几乎无冲击及震动，与液压底盘的实际工作状况一致，两种启动控制下变量泵流量最大值为50L/min时，马达扭矩约为440N.m，马达稳定时压力为6Mpa，马达转速为96r/min，均在液压元件的承受范围之内，且仿真输出的参数与理论计算结果基本一致，符合设计要求。通过底盘作业性能试验结果可知，底盘最大跨越高度为200mm，跨越宽度为300mm，高速直线行驶最大偏移量为2.57m，可稳定通过20°坡度，且操作平稳，转向灵活，各项性能参数均能较好地满足丘陵山地底盘作业要求。