Anti-rebound Cushion Device for Hydraulic Breaker

This paper analyzes the phenomenon of rebound impact and its negative influence on the present hydraulic breaker. To get over its shortcomings, a new anti-rebound cushion device has been designed to prevent the phenomenon of rebound impact. A hydraulic cushion is used to absorb the rebound impact energy, which can be released for the next stroke of the hydraulic breaker. Thus, there is little loss of energy, and the efficiency of the impact system can be increased by 5 %. The absorption effect of the hydraulic anti-rebound cushion increases the service life of breaker components by up to twice as long as in the current breaker. A dynamic model and a motion equation of the anti-rebound cushion device are presented, and the optimum frequency and damping ratio are obtained, providing optimum design parameters for the anti-rebound cushion device.

冲击器防反弹冲击缓冲装置的设计

分析了液压冲击器的反弹冲击现象及其不利影响,为克服其不足之处,特设计了一种新型的防反弹冲击缓冲装置,利用液压缓冲垫吸收反弹冲击能量,液压能在液压碎石冲击器冲程时再释放出来,使能量浪费少,系统效率高,并且液压缓冲装置吸振效果好,使用寿命长。经分析表明,该装置能从根本上消除反弹冲击对液压冲击器的不利影响,具有重要的意义。

着陆缓冲气囊的无反弹设计方法研究

着陆缓冲气囊发生反弹将造成系统姿态不可控、二次冲击等危害,针对排气型着陆缓冲气囊系统易发生反弹的问题,提出了一种着陆缓冲气囊的无反弹设计方法。首先给出了6种不同形状气囊的缓冲过程变形假设,并基于牛顿第二定律和热力学方程建立了气囊系统的动力学解析模型;然后采用该模型以无反弹为约束条件对着陆缓冲气囊进行优化,实现了气囊的无反弹设计。运用此方法对圆柱形气囊进行无反弹多目标优化,得到了有效载荷最大冲击加速度更小、触地速度更小,且缓冲过程无反弹的气囊模型;优化前后气囊模型的解析计算结果与有限元仿真结果一致性好,表明所建解析模型合理,精度较高,验证了所提方法的有效性。