国产混凝土泵目前主要有五种换向方式：一种是机械换向（该方式已趋淘汰），第二种是液压换向，第三种是机电式继电器控制换向，第四种是可编程控制器控制换向，第五种是逻辑电路控制换向。由于技术上的原因，最后一种以逻辑电路为核心的控制换向方式，目前国内尚极少应用。本 Domestic concrete pumps currently have five main ways of commutation: one is mechanical commutation (this method has been phased out), the second is hydraulic commutation, and the third is electromechanical relay control commutation, the fourth is available The programming controller controls the commutation and the fifth one is the logic circuit control commutation. For technical reasons, the last kind of control commutation method with the logic circuit as the core is still rarely used in China. this