履带式液压吊管机必须安装快速落钩装置、吊钩高度自动限位装置、吊臂自动限位装置,以保证设备及操作人员安全。当吊管机因地基下沉或超载可能发生倾翻时,用快速落钩装置将重物快速放到地面,可确保人机安全。在吊钩达到最大高度时,吊钩高度自动限位装置的限位开关动作,起升电磁阀控制起升机构停止起升,防止过卷。吊臂达到最小幅度时,吊臂自动限位装置中的限位开关切断吊臂变幅电磁阀供电,吊臂 Crawler hydraulic pipe-hanging machine must be installed quick hook device, hook height automatic limit device, crane automatic limit device to ensure equipment and operator safety. When the pipelayer may fall due to the foundation sinking or overload, the quick hooking device can quickly put the weight on the ground to ensure the safety of man-machine. When the hook reaches the maximum height, the height limit of the hook height automatic limiting device is activated and the lifting solenoid valve controls the lifting mechanism to stop lifting to prevent over-winding. When the boom reaches the minimum amplitude, the limit switch in the boom automatic limit switch cuts off the boom power supply of the luffing solenoid valve and the boom