ＰＪＩ型混凝土喷射机械手的安装底盘具有自行牵引动力，前、后车架铰接转向；机器行走时由柴油机带动，机械手工作时靠电动机驱动。这种新型机械手属国内首创，其设计突破了传统机构的局限，采用全液压控制，集中操作；机械手的各部分协调动作，可随时将喷头调整到所要求的高 The mounting chassis of the PJI-type concrete jet manipulator has its own traction power. The front and rear frames are articulated; the machine is driven by the diesel engine when the machine is in motion, and the manipulator is driven by the motor when it is working. This new type of manipulator is the first in the country. Its design breaks through the limitations of traditional institutions, adopts full hydraulic control, and concentrates operation; the coordinated operation of various parts of the manipulator can adjust the nozzle to the required height at any time.