【作者】 孙永飞；

【导师】 景作军；

【作者基本信息】 北方工业大学 ， 机械制造及其自动化， 2012， 硕士

【摘要】 液压冲击器是将液压能转换成机械冲击能的碎石工具,它被广泛应用于冶金、开矿、道路建设等行业,特别是开铁口机液压冲击器,在炼铁过程中起着重要作用。鉴于我国液压冲击器依赖进口的现状,本文在研究国外先进液压冲击器基础上,基于对液压冲击器动态特性和性能仿真研究,对液压冲击器进行了设计研究,为液压冲击器结构设计和改进提供理论参考。论文主要完成了如下工作：(1)研究了HS571-GHN型液压冲击器结构,以及冲击机构工作原理,对主要零部件结构参数设计进行了研究。(2)在MSC.Nastran平台下,完成了对液压冲击器动态特性分析,包括模态分析和瞬态响应分析。在模态分析中,获得了液压冲击器结构各阶模态振型和固有频率,研究了液压冲击器结构振动特性和刚性；在瞬态响应分析中,获得液压冲击器在冲击瞬间的位移、速度和加速度的响应特性。通过对液压冲击器动态特性研究,发现液压冲击器机头和机尾部分振动强烈,冲击时刻冲击惯性较大。动态特性研究为液压冲击器设计和结构改进提供理论基础。(3)在Matlab平台下,完成了对液压冲击器冲击活塞运动学仿真研究和冲击活塞与缸体间隙、油液温升对冲击性能影响研究。推导了液压冲击器的冲击活塞运动学理论计算公式,对液压冲击器的输入流量与主要性能参数之间的关系进行了研究；同时,研究了冲击活塞与缸体间隙和油液温升对液压冲击器的冲击性能的影响,为液压冲击器的结构设计提供参考。(4)在液压冲击器动态特性仿真和性能仿真研究基础上,对液压冲击器进行了结构改进设计。计算机虚拟设计和仿真技术的应用,对液压冲击器设计和改进有着重要的意义,随着仿真技术的成熟,对液压冲击器设计和改进起到重要的作用。更多还原

【Abstract】 Hydraulic impactor, which it transfer hydraulic energy into impact energy, is a kind of stone-broken equipment. It is widely used in metallurgy, mining, road construction and so on. Hydraulic impactor of tapping Machine plays a important role in ironlmaking.The hydraulic impactor is relied on import in our country. It is meaningful to the hydraulic design and improvement that research the foreign hydraulic impactor. Dynamic characters and property simulation are done, then the hydraulic impactor is designed and improved. This work is benefited to the hydraulic impactor’a fault prediction and structure improvement theoretically.(1) The impact structure’s working principle of the HS571-GHN hydraulic impactor’s is introduced. A few of some parts’ and assemblies’ parameter designs are paid attention.(2) The hydraulic impactor’s dynamic character, which is included model analysis and transient analysis, is studied by means of the MSC.Nastran software. The first ten vibration shapes and natural frequency are worked out by model analysis. The hydraulic impactor’s vibration characters and stiffness are studied by the model analysis results, and further, the model analysis results provide theoretical basis for the hydraulic impactor’s structure design and improvements. The impact time’s displacement, velocity, acceleration are worked out by means of transient analysis. The structure’s inertia is big, which is harmful to the parts’ life.(3) Hydraulic impactor’s performance simulation is accomplished based on kinematics model on the platform of MATLAB. The relationship between the input flow and the main performance indexes are studied based on the simulation results. The influence to the impact’s performances of the gap between the piston and the cylinder and the oil temperature rise are also studied. These discussions are benefit for the structure design arid improvements.(4) Impactor’s structure design and improvements are studied based on the dynamic characters and the performance simulation results.Computer virtual design and simulation application play more and more important role in the design of the hydraulic impactor, especially as the FEA technology is widely used maturely, it is benefited for the structure’s prediction design.更多还原