液压冲击器性能气压测试法分析

Analysis of Hydraulic Impactor Air-Pressure Test System

由于采用气压法对大功率液压冲击器进行冲击性能测试时,测压管中气压传递发生的畸变会导致较大测量误差。通过构建气压管道传感系统无损模型,获得了气压测试系统的传递函数,在此基础上对管道结构尺寸进行了研究,从理论上分析了管道谐振频率以及管道瞬态压力往复反射状态变化对测量误差的影响规律。对大功率液压碎石器TB 725X的冲击性能参数采用两种不同结构参数的测压系统进行对比,试验结果表明,理论分析和试验数据基本吻合,为正确设计冲击器性能参数气压测量系统提供了有效的方法。

When using air-pressure method to test the performance of a high-power hydraulic impactor,an obvious error in measurement will be produced due to the distortion of air pressure transfer.In this paper,the transfer function of the air-pressure testing system is obtained by using a lossless model of its pneumatic pipe sensing system.Based on this,a further study on the structure size of the pipe is done and then the effects of the resonant frequency and transient pressure reciprocating reflection change of the pipe on measurement error are analyzed in theory.A comparison of the test results of two testing systems with different structure sizes used to test impact performances of a high-power hydraulic rock breaker TB725X indicates that the theoretical analysis agrees with the test results fairly well.The work in the paper provides an effective way to design an air-pressure testing system for measuring the performance parameters of an impactor.