长螺旋钻机提钻力学行为及提钻液压控制系统研究

【作者】 庞浩；

【导师】 罗春雷；

【作者基本信息】 中南大学 ， 机械设计及理论， 2008， 硕士

【摘要】 近年来,长螺旋钻孔机凭借其适应性广,施工环保等优势在桩基础领域获得了广泛的应用,成为当前极具市场潜力的桩工机械。但是,由于是新兴的桩基础施工机械,对其提钻力认识不足,经常发生现场施工设备选型不当而造成所选设备难以适应施工作业的现象。同时还存在着向大功率发展困难以及自动化程度低、质量不可靠等问题,阻碍其进一步发展,影响其未来的市场竞争力。本文以土力学为基础,基于地质参数对长螺旋钻机提钻力学行为进行分析,推导得出两种提钻方式下的提钻力和能耗理论计算公式。并以现场实验数据对此提钻力理论计算公式进行了论证。此提钻过程力学行为研究是比较深入而全面的,为设计长螺旋钻机确定绞车主要参数以及桩基础施工设备选型提供了理论依据。针对具体工程条件,本文以提钻力学理论计算求出的结果为设定参数的依据,设计了适合工况要求的液压绞车控制系统。此提钻驱动控制系统具有自动卸荷功能;由于采用了压力流量复合控制的负载敏感泵,流量控制精度高,不受负荷压力变化的影响,并具有明显的节能特征;采用电液比例控制,调速范围广,并为自动化控制打下了基础。论文对此控制系统进行建模仿真分析。通过仿真曲线分析得知采用负载敏感泵和比例换向阀的绞车系统性能安全可靠,此设计方案能有效解决传统长螺旋钻机存在的问题。更多还原

【Abstract】 In recent years, the continuous flight auger has obtained the widespread application and market potential in the construction field, relying on its superiority such as broad compatibility, environmental protection and so on. But this kind of machine on present still exist massive questions including the insufficient design theory, the difficulty that it develops to the high efficiency, the low automaticity and the unreliable quality .These questions will hinder its further development seriously and affect its future market competitiveness.This article’ first carries on the comprehensive analysis to the drilling-out strength, using the knowledge of soil mechanics. And it has provided the theory that basis for the determination the main parameter to the hydraulic winch of continuous flight auger. Then it uses the electro-hydraulic proportional load-sensitive variable displacement piston pump in the hydraulic control system design, and has guaranteed the full using to the installed capacity and the small system energy loss. It also has solved the questions such as the heating of traditional continuous flight auger and the system energy conservation.This article that basis results by carry-drilling mechanics theory enactmented paremeter designs control system of hydraulic winch fiting lenth of service.Simultaneously it carries on the velocity modulation and uses the electro-hydraulic proportional control valve, so builds the foundation for the automated control. Because uses the load sensitive pump in designed hydraulic control system,so enhance the precision of the control systemIt and envoid the affect of the load’s varibility and solves effectively the system energy conservation questions.because of taking the electro-hydraulic proportional ,the control timing range get larger and the foundation for the automation drilling-out control has been built.Finally, it carries on the modeling simulation analysis to the system. Through the simulation tracing analysis, we can know the safe reliable of winch system performance that using the load sensitive pump and electro-hydraulic proportional control valve, and also know that this system can meet the operation requirements.更多还原