硬岩掘进机液压阀块设计方法

为了改善基础振动下液压阀块流道流通品质,基于有限元原理建立了基础振动下流道的仿真模型并验证了仿真模型的正确性;分析了基础振动下不同流道的布局方式,工艺孔结构参数,进出口流道长度对流道压降特性的影响;提出了基础振动下液压阀块的设计流程.研究结果表明:基础振动下U型流道压降特性最好,Z型流道最差;U型流道工艺孔长度越短,流道压降平均值和压降波动越小;Z型流道工艺孔长度为3.5倍工艺孔直径,V型流道的工艺孔长度为3倍工艺孔直径时,流道压降平均值和压降波动较小;工艺孔直径略大于进出口流道直径时,有利于减小基础振动的影响;出口流道的长度在3倍出口流道直径以上时,有利于避免流道出口处于转弯后流场的恢复区.新的设计方法能够有效减小阀块内流体压降大小,提高压力稳定性.

Design Method of Hydraulic Valve Block for Tunnel Boring Machine

In order to improve the flow quality of flow channels in hydraulic valve block under foundation vibration, a simulation model of flow channels under foundation vibration was established based on finite element theory and the correctness of the simulation model was verified. The effects of the different flow channels layout, process holes structure parameters, import and export flow length on the pressure drop characteristics of flow channels were analyzed under the foundation vibration. The design flow of hydraulic valve block under the foundation vibration was put forward. The results show that the U-shaped flow channel has the best pressure drop characteristics and Z-shaped has the worst pressure drop characteristics under the foundation vibration; the shorter U-shaped groove hole length is, the smaller the pressure drop average and the pressure drop fluctuating is; when the length of Z-shaped flow channel fabrication hole is 3.5 times the diameter of fabrication hole, the length of V-shaped flow channel fabrication hole is 3 times the diameter of fabrication hole, the average and fluctuating of pressure drop are less; it is helpful to reduce the impact of foundation vibration when the diameter of fabrication hole is bigger than the diameter of import and export flow channel; when the length of the export flow channel is over 3 times the diameter of export flow channel, it is beneficial to avoid recovery area after the outlet flow channel in turn flow field. The new method can effectively reduce the pressure drop in valve block and improve the pressure stability.