混凝土泵泵送系统液压冲击抑制方法研究

发布时间：2018-01-03 03:40

本文关键词：混凝土泵泵送系统液压冲击抑制方法研究　出处：《中南大学》2014年硕士论文　论文类型：学位论文

【摘要】：摘要：随着混凝土泵朝着低液压冲击方向发展,人们对混凝土泵品质的要求变高。液压冲击作为引起系统振动、噪声和缩短系统使用寿命的重要原因,已成为当前混凝土泵研究的热点。本文针对泵送系统换向时液压冲击的产生机理及其抑制方法进行理论与仿真分析,并进行试验研究。主要工作内容如下： 1.综述了混凝土泵送系统的工作特点、国内外现状及发展趋势；介绍了液压系统中液压冲击的产生机理及危害；总结并分析了国内外关于液压冲击及其抑制方法的研究现状。 2.基于混凝土泵送系统的工作原理和特点,分析得出其换向时产生液压冲击的原因在于泵送系统动作切换与换向阀换向的不匹配性和外负载的突变；分析了泵送系统的负载特性。 3.对泵送系统液压冲击进行了理论分析与计算,建立了泵送系统的数学模型和AMEsim仿真模型,对液压冲击的影响因素进行仿真分析,得出了影响规律和敏感影响因素。 4.有针对性地提出了液压冲击抑制方法,并论证了它的可行性与有效性；对泵送液压系统进行改进,并通过AMEsim仿真对比分析了所提抑制液压冲击方法的效果。仿真结果表明：泵送系统采用双换向阀加蓄能器对泵送系统液压冲击的抑制效果较好；对系统参数进行优化,得出最佳参数组合。 5.在混凝土泵样机上进行了试验研究,通过试验验证了建模的正确性；对比分析了泵送系统改进前后油泵出口压力及泵送液压缸无杆腔的压力变化情况。试验结果表明：采用双换向阀加蓄能器可以有效抑制泵送系统的换向液压冲击。
[Abstract]:Abstract: with the development of concrete pump in low hydraulic impact direction, people on the quality of concrete pump becomes high. The hydraulic impact as caused by system vibration, an important reason for noise and shorten the system life, has become a research hotspot of concrete pump. In this paper the mechanism of pump system reversing hydraulic shock and its inhibition method theoretical analysis and simulation, experimental study was carried out. The main contents are as follows:
1., the working characteristics of concrete pumping system, the current situation and development trend at home and abroad are reviewed. The mechanism and harm of hydraulic impact in hydraulic system are introduced. The research status of hydraulic impact and its suppression methods at home and abroad is summarized and analyzed.
2., based on the working principle and characteristics of concrete pumping system, it is concluded that the cause of hydraulic impact is the mismatch of pump operation system switching and reversing valve commutation, and the sudden change of external load. The load characteristics of pumping system are also analyzed.
3., the theoretical analysis and calculation of the hydraulic impact of the pumping system is carried out. A mathematical model and a AMEsim simulation model of the pumping system are established. The influencing factors of hydraulic impact are simulated and analyzed, and the influencing rules and sensitive factors are obtained.
4. proposed the hydraulic shock suppression methods, and demonstrates its feasibility and effectiveness; the pump hydraulic system is improved, and through AMEsim simulation comparative analysis of the proposed method. The effect of inhibition of hydraulic impact simulation results show that the pumping system adopts double valve and accumulator good inhibition effect feeding system of hydraulic impact on pump; the parameters of the system optimization, the optimum combination of parameters.
5. in the concrete pump prototype was studied through the experiment verifies the correctness of modeling; comparative analysis of the change of pressure pumping system before and after the improvement of the oil pump outlet pressure and pump hydraulic cylinder rodless cavity. The experimental results show that the double valve plus storage reversing hydraulic device can effectively suppress the impact energy of pump the system.

【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU646

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