基于Simulink液压举升缸内部缓冲机构设计分析

液压举升系统缓冲回路不仅使得系统结构复杂,而且无法实现整个举升行程的全覆盖,当运行到行程终点时,无法实现缓冲。自卸式车辆由于在举升终点要实现平稳卸货,因此需要采用其他方式实现缓冲。根据自卸车液压举升机构的结构特点,对缓冲装置进行设计,在液压缸的端部设计缓冲装置,对其工作过程进行分析,基于Simulink搭建系统的分析模型,对举升缸速度变化及各腔压力变化进行分析,并搭建液压举升机构试验台,对缓冲装置性能进行分析。对比分析可知:针对自卸车车辆设计的缓冲装置很好地实现各种举升工况性能的要求;缓冲装置作用使得系统在最大压力和最小压力均能实现稳定缓冲;举升缸伸长量模型分析结果和试验分析结果基本一致,表明设计分析的可靠性,为同类设计提供参考。

Design and Analysis to the Buffered Device in Hydraulic Lifting Cylinder Based on Simulink

The buffer circuit of the hydraulic lifting system not only makes the system structure complexly, but also cannot a-chieve full coverage to the whole lifting stroke, when running to the end of the stroke, the buffer cannot be achieved. To achieve smooth discharge in the end of the dump truck lifting, another mean is used to achieve buffer. According to the structural characteristics of dump truck hydraulic lifting mechanism, the buffer device was designed, and the hydraulic cylinder end cushioning device was de-signed. The device work process was analyzed. The system analysis model was built based on Simulink and the speed change and each chamber pressure change of the lifting cylinder were analyzed. The sample hydraulic lifting mechanism for cushioning device perform-ance analysis was built. Comparative analysis shows:cushioning device for dump truck can achieve good working conditions of various lifting performance requirements;buffer device makes the system achieve stable buffer under the maximum pressure and minimum pres-sure; the analysis results and the test results of the lifting cylinder elongation are consistent, indicating the reliability of the design and analysis. It provides reference for similar design.