Analysis and optimization of parameters affecting cushion performance of high pressure arm cylinder

CHEN Xun1, LI Li-hong1, ZHOU Jun1, 2, ZHANG Yan-liang1, ZENG Yin-ping1

(1. School of Mechanical Engineering, Shandong University, Jinan 250061, China; 2. Key Laboratory of High Efficiency and Clean Mechanical Manufacture Shandong University, Jinan 250061, China)

Abstract: In order to solve the problem of bad cushion performance and easily leading to damage when high pressure arm cylinder gets to its stroke end, the structure of cushion units needs to be optimized. This paper regards heavy load excavator (a domestic brand) arm cylinder as research object, computer simulation technology was introduced into construction machinery field, and on the basis of correctly built simulation model, two parameters, i.e. cushion pressure and piston velocity were taken as the main evaluation indexes, and control variables method was applied to test the sensibility of the same cushion structure with different parameters, and what role the structure plays during cushion process. The results show that the diagonal planes on the outer surface of cushion collar play the most important role in the cushioning of cylinder piston side chamber; and for rod side chamber, the throttling orifices on the cylinder cover affect the cushion performance most, furthermore, the optimum value of some cushion structures are recommended.