The electric timing system of the main lifting structure on bridge crane is researched in this paper for providing a reference to the improvement of the electric controlling system.
主要研究桥式起重机主起升机构调速系统，为工厂桥式起重机电控系统改造提供一种参考。
With the main blade lifting screw, nut structure, stable and reliable.
主锯片升降采用螺杆，螺母结构，平稳可靠。
The oil-line structure, control system and their working principles of the hydraulic lifting system for the main magnets of CYCIAE-30 cyclotron are introduced.
研究设计了CYCIAE-30回旋加速器主磁铁液压举升系统的油路结构和控制系统，并说明了它的工作原理。
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