Head, shaft head, using cast iron sleeve, wear durability, lifting equipment sub-two kinds of electric and manual.
水头、轴头、采用生铁套，耐磨耐用，提升装置分电动和手动两种。
2
The continuous model is adopted in the torsional vibration frequency and resonance of shaft system, the lumped parameter equivalent applied in the sub-synchronous resonance.
轴系扭振频率和响应计算采用连续质量模型，次同步谐振特性分析采用集中质量模型。
3
Incremental motion encoder (IME) is a new type of transducer for shaft center trace measurement with resolution up to sub-micro.