汽车起重机动力加压落幅系统研究

发布时间：2018-06-15 09:53

  本文选题：汽车起重机 + 重力落幅系统　； 参考：《甘肃农业大学学报》2016年04期

【摘要】：【目的】汽车起重机重力落幅系统存在落幅速度不均匀和操控性差等问题,而动力落幅系统存在起重臂易抖动等问题.针对上述系统存在的两个问题,结合重力落幅系统和动力落幅系统的优点,提出一种动力加压落幅方案,即向变幅油缸有杆腔加压,增加了起重臂大角度的落幅速度;同时改变变幅平衡阀的控制方式,由控制手柄直接控制,避免有杆腔油压对变幅平衡阀的影响.【方法】通过理论研究和MATLAB仿真研究,定性分析了平衡阀的流量饱和特性.【结果】平衡阀阀芯节流槽通流面积越大,达到饱和的流量越大,而压差越小.将研究结果应用于汽车起重机的动力加压落幅系统,通过变更平衡阀的阀芯结构,以限制起重臂小角度的落幅速度.【结论】通过试验测试,动力加压落幅系统的落幅均匀性提高,最大流量差减少约61%,全程落幅时间缩短约38%.
[Abstract]:[objective] there are some problems such as uneven falling velocity and poor maneuverability in the gravity fall system of truck crane, and easy jitter of the lifting arm in the power drop off system. Aiming at the two problems existing in the above system and combining the advantages of the gravity and the dynamic amplitude dropping system, a dynamic pressure drop scheme is proposed, that is, the pressure of the rod cavity in the variable amplitude cylinder increases the falling velocity of the lifting arm at a large angle. At the same time, the control mode of the variable amplitude balance valve is changed, which is controlled directly by the control handle to avoid the influence of the oil pressure of the rod cavity on the amplitude change balance valve. [methods] through theoretical research and MATLAB simulation study, The flow saturation characteristics of the balance valve are qualitatively analyzed. [results] the larger the flow area of the valve core throttling slot, the larger the flow rate to saturation and the smaller the pressure difference. The research results are applied to the dynamic pressure drop system of truck crane. By changing the valve core structure of the balance valve, the velocity of falling amplitude at small angle of the lifting arm is limited. [conclusion] the test is carried out. The drop uniformity of the dynamic pressure amplitude drop system is improved, the maximum flow difference is reduced about 61%, and the whole fall time is shortened about 38%.
【作者单位】： 长安大学公路养护装备国家工程实验室;三一汽车起重机械有限公司;
【基金】：中央高校基本科研业务费专项资金(0009-2014G1251024)
【分类号】：TH213.6
，

本文编号：2021609