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液压凿岩机钎杆回弹造成了机体刚性冲击,降低了凿岩机的工作效率和使用寿命,针对此不足,通过回弹波动理论分析,提出了回弹速度的计算方法和回弹缓冲装置的设计方法,从蓄能器的耦合和局部阻力角度建立缓冲活塞的数学模型,得出了缓冲活塞运动的非线性方程.利用Simulink对缓冲活塞进行了运动学仿真,分析了预充压力对回弹缓冲装置的动特性影响和其对工况的响应能力,并与实验结果进行对比,验证了仿真的准确性.结果表明:回弹速度与预充压力无关,与工作介质有关,介质系数增大,回弹速度增大.回弹缓冲装置设计有很好的工况响应能力,增加了液压凿岩机的可靠性,工作效率提高了7.23%,更符合实际工况要求.
The rebound of hydraulic rock drill rod caused the rigid impact of the body and reduced the work efficiency and service life of the rock drill. In view of this problem, the calculation method of rebound velocity and the design method of rebound damping device are put forward based on the analysis of the rebound fluctuation. The mathematical model of the cushioned piston is established from the perspective of the coupling and the local resistance of the accumulator, and the nonlinear equation of the cushioned piston is obtained. The kinematics simulation of the cushioned piston with Simulink is carried out. Dynamic characteristics and their response to working conditions, and compared with the experimental results to verify the simulation accuracy.The results show that: the rebound velocity has nothing to do with the precharge pressure, and the working medium, the dielectric coefficient increases, the rebound The speed increases.The design of rebound cushioning device has a good working condition response ability, increases the reliability of the hydraulic rock drill, the working efficiency is increased by 7.23%, more in line with the actual working conditions.