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MLS_3-170型采煤机牵引部液压系统见图1。背压阀27的作用是保持主油路低压侧有15kg/cm~2的背压,在系统正常工作时,该阀流通量几乎为辅助泵的流量。在采煤机液压系统运行过程中,发现该阀出现压力不稳定、压力超调等现象。为此我们对它进行了实验研究,实验表明该阀在额定流量下工作处于不稳定状态。我们对该阀进行改进,性能有明显提高。
MLS_3-170 Shearer hydraulic system shown in Figure 1. The function of the back pressure valve 27 is to maintain a back pressure of 15 kg / cm ~ 2 on the low pressure side of the main oil circuit. When the system is operating normally, the valve flow rate is almost the same as the flow rate of the auxiliary pump. During the operation of the shearer hydraulic system, the valve was found to be unstable in pressure and pressure overshoot. To this end, we conducted an experimental study of it, the experiment shows that the valve at the rated flow of work in an unstable state. We improved the valve, the performance has improved significantly.