混凝土泵车臂架液压平衡回路动态响应特性研究

发布时间：2018-06-17 20:38

本文选题：混凝土泵车 + 平衡回路　；参考：《燕山大学》2014年硕士论文

【摘要】：混凝土泵车基于它便捷化的操作方式，，在工程中的应用是越来越广泛。泵车技术现在主要是朝着智能、安全、高效节能的方向发展。其中臂架电液控制技术作为智能化的一个重要方向，在工程实际中将有非常广泛的应用潜力。臂架电液控制系统采用的是闭环控制方法，并且每节臂都是一个独立的闭环控制系统，通过控制各节臂的角度位置来实现控制臂架末端最终的浇筑位置的目的。泵车臂架智能化的主要研究方向是电控，同时其液压系统的好坏对其也有非常重要的影响，这主要体现在液压平衡回路系统响应的延迟和系统的稳定性，因此在不以牺牲效率的前提下解决这两个问题即是本文的主要研究内容和目的。本文首先对平衡回路系统进行了分析，研究了各类平衡回路及其适应场合，重点研究了变负载工况的平衡回路。可以看出，利用传统的研究方法无法从根本上解决平衡回路存在的动态响应差和控制压力高的问题，因此本文结合组合阀的思想（进回油独立控制），提出并设计了新的平衡回路系统。运用数学建模的方法对臂架的阀控非对称液压缸系统进行建模，得出其输入输出的关系。利用Simulink工具箱建立了阀控缸平衡回路的控制模型，同时利用AMESim进行了液压系统模型的搭建。在一定的实验基础上，得到了较为准确的联合仿真模型，然后对带传统平衡阀的回路与新的平衡回路进行了仿真实验的对比研究。从流量的角度分析了执行件运动速度稳定性较好，响应较快，且超调量及调整时间都较小；从进油腔压力的角度分析，系统多余压力和压力冲击情况都比传统的平衡回路要好，节能效果好。
[Abstract]:The concrete pump car is based on its convenient operation mode, the application in the engineering is more and more extensive. The technology of pump car is now mainly towards the direction of intelligence, safety, high efficiency and energy saving. As an important direction of intelligence, the arm electric hydraulic control technology will have a very wide application potential in the engineering practice. The system adopts a closed loop control method, and each arm is an independent closed loop control system. The end of the end of the control arm is controlled by controlling the angle position of each arm.
The main research direction of the pump truck's arm is the electric control, and the quality of its hydraulic system also has a very important influence on it. This is mainly reflected in the delay of the response of the hydraulic balance loop system and the stability of the system. Therefore, it is the main research content and purpose of this paper to solve the two problems without sacrificing the efficiency.
This paper first analyzes the balance loop system, studies all kinds of balance circuits and their adaption situations, and focuses on the balance loop of the load changing conditions. It can be seen that the traditional research methods can not solve the problems of dynamic response and high control pressure in the balance loop. Therefore, this paper combines the combined valve. The new balance loop system is put forward and designed. A mathematical modeling method is used to model the valve controlled unsymmetrical hydraulic cylinder system of the arm frame, and the relationship between the input and output is obtained. The control model of the valve control cylinder balance loop is established by using the Simulink toolbox, and the hydraulic system model is carried out by AMESim. On the basis of certain experiments, a more accurate joint simulation model is obtained, and then the comparison of the simulation experiments with the traditional balance valve circuit and the new balance loop is carried out. From the point of view of the flow, the motion speed stability of the actuator is better, the response is faster, and the overshoot and the adjustment time are small; The analysis of the pressure angle of the oil inlet chamber shows that the system's surplus pressure and pressure impact are better than the traditional balance circuit, and the energy saving effect is good.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU646

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