关键词: 流量饱和特性, 流量-压差曲线, 汽车起重机, 平衡阀

Abstract:

Counterbalance valve is a kind of important control components. The dynamic analysis of the counterbalance valve with truck crane is researched. The flow-differential pressure curves of counterbalance valves are derived and the simulation study is performed to demonstrate the existence of the flow saturation characteristic. The impact of parameters is analyzed. The simulation results show that the flow saturation characteristic is related to the number of notches and the control pressure. The flow saturation point is larger with more number of notches. But the corresponding differential pressure at the flow saturation point is lower. In addition, the flow saturation points are directly proportional to the control pressures. While the differential pressures of the counterbalance valve at the flow saturation points are inversely proportional to the control pressures. The validity of study is verified through bench experiments. At last, a class of counterbalance valves of truck crane and corresponding system are improved based on the research and a test is finished. Test results show that the flow of boom falling decreases about 61% and entire falling time shortens 38% which prove the research results have the value of engineering application.

Key words: flow saturation characteristic, flow-differential pressure curve, truck crane, counterbalance valve