基于LS-DYNA的射流式液动锤活塞回程缓冲结构的研究

Research on Disc Spring Buffering the Backward Impact of Piston of Liquid-Jet Hydraulic Hammer Based on LS-DYNA

摘要:

为了减弱射流式液动锤活塞回程撞击缸体的应力波对射流元件的破坏，延长射流元件的寿命，提出在缸体中设置碟簧缓冲结构来吸收冲锤回程的冲击能，并应用LS-DYNA显示动力学分析手段，对活塞回程进行仿真分析，探究碟簧缓冲对射流元件受力状态的影响，结果表明：采用碟簧缓冲结构，射流元件的最大应力可降低40%～57%，有效改善了射流元件的应力状态，在液动锤实际工作中具有可行性。

Abstract:

In order to reduce the damage to fluidic element caused by stress waves from impacting cylinder in a return-stroke of the fluidic hydraulic hammer piston to prolong the life of the fluidic element, a disc spring buffer structure in the cylinder was proposed to absorb the striking energy of hammer stroke. The simulation analysis was carried out on the piston return-stroke by the means of LS-DYNA display dynamic analysis to study the effect of the disc spring buffer on the stress state of bi-stable fluidic amplifier. The results show the feasiblility of disc spring buffer structure in the actual work of hydraulic hammer, the maximum stress can be decreased by 40%～57% in bi-stable fluidic amplifier and the stress state of fluidic element is effectively improved.