折臂式随车起重机变幅液压系统性能优化提升研究

为提升折臂式随车起重机变幅液压系统性能，介绍了当前变幅液压系统工作原理，并在此基础上开展实验研究，测试结果表明：当前变幅液压系统主阀调速区间偏小，变幅油缸下降时存在较大压力波动，且最大下降速度远小于设计值。根据上述测试结果分析影响变幅液压系统性能的主要原因，从而提出变幅液压系统及零部件的优化方案。采用相同的实验方法对优化方案进行验证，改进前后实验结果对比表明：该优化方案能够有效增大主阀调速区间，降低压力冲击，减小溢流损失，提升作业效率，使变幅液压系统性能得到明显提升。

Performance Optimization Research of Lorry-mounted Crane Luffing Hydraulic System

In order to improve performance of lorry-mounted crane luffing hydraulic system, we introduce working principle of a current luffing hydraulic system first. On this basis, an experimental research is carried out. The test results show that speed regulation range of main valve of current luffing hydraulic system is relatively small, and there is a large pressure fluctuation when an oil cylinder descends, and the maximum descending speed is much less than the design value. According to the above test results, the main reasons influencing performance of hydraulic system are analyzed, and an optimization scheme of hydraulic system and parts is put forward. Finally, the same experimental method is used to verify the optimization scheme. The comparison of test results before and after improvement indicates that: the optimized scheme can effectively increase the speed regulation range, reduce pressure impact and overflow loss and improve working efficiency, and the whole machine performance is improved significantly.