泵车臂架新型平衡阀设计与仿真研究

发布时间：2018-11-03 15:22

【摘要】：液压平衡阀是平衡回路中的关键元件，在现代工程机械特别是起重机械和混凝土泵送机械中应用广泛。它在起重机臂架下落工况和泵车臂架展开、收回的工况中起到至关重要的作用，若其设计不合理会严重影响整机的作业性能，而且目前国内应用的平衡阀多为国外进口。因此对液压平衡阀的研究具有重要理论意义和工程应用价值。本文研究了泵车臂架系统的典型工况，得出了不同工况对平衡阀性能的要求，提出了一种泵车臂架新型平衡阀设计方案及具体结构，对平衡阀内部液压桥路和主阀芯节流槽的进行了设计。利用AMESim软件，建立了泵车臂架新型平衡阀的仿真模型。分正向进油和反向回油两种工况对新型平衡阀的模型进行了仿真，仿真结果表明：正向进油和反向回油经过该平衡阀压力损失都能符合设计要求，，主阀芯正向和反向开启时间短，也能满足设计要求。本文建立了泵车臂架系统平衡回路的AMESim仿真模型，仿真了臂架正负载时起动到停止、负负载时起动到停止、从正负载过渡到负负载和由负负载过渡到正负载四种典型工况。仿真结果表明：在正负载和负负载两种工况下，臂架突然启动时油缸活塞杆速度响应较快，稳态速度与实际速度相符，突然关闭时响应时间短。泵车臂架在正负载工况和负负载工况过渡的过程中，油缸活塞杆速度也能维持稳定。综上，应用新型平衡阀的平衡回路系统性能可以满足工程应用要求。
[Abstract]:Hydraulic balancing valve is a key element in balancing circuit, and is widely used in modern construction machinery, especially in lifting machinery and concrete pumping machinery. It plays an important role in the falling condition of the crane boom and the boom of the pump truck. If its design is unreasonable, the performance of the whole machine will be seriously affected, and the balance valve used in our country is mostly imported from abroad. Therefore, the study of hydraulic balancing valve has important theoretical significance and engineering application value. In this paper, the typical working conditions of the boom system of the pump vehicle are studied, and the requirements for the performance of the balancing valve under different working conditions are obtained, and a new type of balanced valve design scheme and concrete structure for the boom frame of the pump car are put forward. The hydraulic bridge inside the balance valve and the main valve core throttle are designed. Using AMESim software, the simulation model of a new type of balance valve for boom of pump car is established. The model of the new balancing valve is simulated under the two working conditions of forward oil injection and reverse oil return. The simulation results show that the pressure loss of the forward oil inlet and the reverse return oil through the balance valve can meet the design requirements. The main spool is short in both forward and reverse opening time and can also meet the design requirements. In this paper, the AMESim simulation model of the balance loop of the boom system of the pump truck is established. Four typical working conditions are simulated: starting to stop when the boom is positive, starting to stopping when the load is negative, transition from positive load to negative load and from negative load to positive load. The simulation results show that under both positive and negative load conditions, the piston rod speed response of the cylinder is faster when the boom suddenly starts, the steady state velocity is consistent with the actual speed, and the response time is short when the boom suddenly closes. The piston rod speed of the pump truck can also be kept stable during the transition of positive load and negative load. In conclusion, the system performance of the new balance valve can meet the requirements of engineering application.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TU646;TH137.52

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