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蓄能器耦合特性能很好地反映液压凿岩机的非线性运动规律和流量变化情况,其系统压力响应能力直接决定了整机的工作性能。传统的耦合研究多直接以蓄能器的工作压力作为系统工作压力,这存在一个盲区,割裂了反馈控制关系。针对此不足,基于流体连续性原理,考虑泄漏与补偿等因素的影响,采用蓄能器耦合方法对液压凿岩机的工作特性和流量变化建立非线性数学模型,并推导内部各腔室的压差模型和压力计算方法。通过仿真和试验研究,分析蓄能器耦合方法和蓄能器基本参数对冲击性能的影响规律。结果表明:基于流体连续性原理的蓄能器耦合方法避免了“盲区”问题,液压凿岩机蓄能器预充压力的选择应该控制在一定的范围内,一般取冲击压力的35%~45%。
The coupling characteristics of the accumulator can well reflect the nonlinear motion law and flow change of the hydraulic rock drill. The system pressure response ability directly determines the working performance of the whole machine. The traditional coupling research directly uses the working pressure of the accumulator as the working pressure of the system, which has a blind zone and separates the feedback control relationship. Aimed at this problem, based on the theory of fluid continuity and considering the influence of leakage and compensation, a non-linear mathematical model of working characteristics and flow rate of hydraulic rockdrill was built by using the accumulator coupling method. And the differential pressure model And pressure calculation method. Through the simulation and experimental study, the impact of the accumulator coupling method and the basic parameters of the accumulator on the impact performance is analyzed. The results show that the accumulator coupling method based on the principle of fluid continuity avoids the problem of “blind spot”, the pre-charge pressure of hydraulic rock drill accumulator should be controlled within a certain range, generally take the impact pressure of 35% ~ 45 %.