大型汽车起重机起升机构电液比例技术的研究

发布时间：2018-01-22 23:51

本文关键词： 电液比例微动性汽车起重机起升机构建模仿真　出处：《沈阳建筑大学》2013年硕士论文　论文类型：学位论文

【摘要】：近年来,随着我国经济迅猛发展,国民建设工程量的增加,汽车起重机被广泛应用于各领域。起升机构作为汽车起重机的重要组成部分,由于其直接面向起吊重物反复升降,因此,起升机构液压系统对于整机性能至关重要。目前,大型汽车起重机主要应用在大型工程的安装过程中,要求起升系统微动性好,可实现在吊装过程中重物起降平稳且有较高的安装精度。通过计算机仿真技术,对起升机构液压系统的微动性进行研究,给出了改善起升回路微动性的两种方法,可以为研究其他工程机械液压系统的微动性和为多路阀设计提供借鉴作用。本文首先介绍了电液比例技术的发展和目前其在汽车起重机领域的应用概况,简述了汽车起重机液压系统的组成及特点和液压系统采用的较为流行的技术,分析了比例电磁铁原理和结构特点。本文以某厂生产的70吨汽车起重机的起升机构液压系统作为研究对象,借助Ansoft和AMESim软件对电液比例先导阀建模,通过设计计算和已掌握的样本数据进行反推计算,确定仿真参数,分析位移-力和电流-力特性曲线,确定模型正确。对起升机构液压系统进行建模,通过设定起降的模拟工况,分析阀芯位移与输出流量及物体位移量之间的关系,研究起升机构液压系统的微动性和多路阀影响微动性的因素。本文借助计算机仿真技术,对大型汽车起重机起升机构的液压系统进行建模分析,研究采用电液比例技术应用在起升机构中可以改善系统微动性,分析了影响微动性的因素,提出了改善微动性的方案,为评价工程机械液压系统微动性和多路阀优化改进提供一种研究方法。
[Abstract]:In recent years, with the rapid development of China's economy and the increase of national construction quantity, truck cranes are widely used in various fields. Lifting mechanism as an important part of truck cranes. Because it is directly oriented to the lifting of heavy objects, the lifting mechanism hydraulic system is very important to the performance of the whole machine. At present, the large truck crane is mainly used in the installation process of large engineering. The lifting system is required to have good fretting performance, which can realize the steady take-off and landing of heavy objects in the hoisting process and has higher installation precision. The fretting performance of hydraulic system of hoisting mechanism is studied by computer simulation technology. Two methods to improve the fretting performance of hoisting circuit are presented, which can be used as reference for the study of the fretting performance of hydraulic systems of other construction machinery and for the design of multi-way valves. This paper first introduces the development of electro-hydraulic proportional technology and its application in the field of automobile crane, briefly describes the composition and characteristics of hydraulic system of truck crane and the more popular technology used in hydraulic system. The principle and structure characteristics of proportional electromagnet are analyzed. In this paper, the hydraulic system of lifting mechanism of 70 ton truck crane produced by a factory is taken as the research object, and the electro-hydraulic proportional pilot valve is modeled with the help of Ansoft and AMESim software. Through the design calculation and the sample data obtained, the simulation parameters are determined, the displacement-force and current-force characteristic curves are analyzed, and the model is correct. The hydraulic system of the hoisting mechanism is modeled. By setting the simulated condition of take-off and landing, the relationship between valve core displacement, output flow rate and object displacement is analyzed, and the fretting characteristics of hydraulic system of lifting mechanism and the factors influencing fretting performance by multi-way valve are studied. In this paper, the hydraulic system of the lifting mechanism of a large truck crane is modeled and analyzed by computer simulation technology. The application of electro-hydraulic proportional technology in the lifting mechanism can improve the fretting performance of the system. The factors affecting fretting property are analyzed and the scheme of improving fretting property is put forward. It provides a research method for evaluating fretting performance of hydraulic system of construction machinery and optimizing improvement of multi-way valve.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TH213.6

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