Work principles of travel, braking, steering, lifting and swinging of mast, hoisting and cooling hydraulic circuits are all illustrated.
给出了行走、制动、转向、门架升降与摇摆、吊具，以及冷却液压回路的工作原理图。
The mast provides a means of lifting and stabilizing tools, and running pressure-control and other equipment.
桅杆提供了提升和稳定各工具以及下入压力控制设备和其它设备的一种方法。
This paper presents the general installation method of the television tower steel mast, integral elevating method and integral lifting method.
本文介绍了一般电视塔钢桅杆的安装方法，即整体提升法和整体顶升法。
Lifting operation hydraulic system should be no-load operation, adjust the lifting sleeve frame roller and the mast section clearance, hoisting torque and balance torque balance;
顶升作业时液压系统应进行空载运转，调整顶升套架滚轮与塔身标准节的间隙，使起重力矩与平衡力矩保持平衡；
Operation of lifting or laying down a new mast or overhauled mast shall be carried out under the instruction of the manufacturer's representative.
新配套或大修后第一次组装的井架，起放井架作业应在厂方的指导下完成。
Do not use tractors to replace the rig power system for mast lifting and laying down.
不应使用牵引车代替钻机动力系统进行起放井架作业。
This standard specifies the technical requirements special regulations on the inspection lifting and laying down of self-erection mast of land rig.
本标准规定了陆地钻机自升式井架起放作业的检查、起升和下放技术要求及特殊规定。
This standard specifies the technical requirements special regulations on the inspection lifting and laying down of self-erection mast of land rig.
本标准规定了陆地钻机自升式井架起放作业的检查、起升和下放技术要求及特殊规定。
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