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半敞开“小车”式环吹风装置  Semi-open cart type quench air units (annular blow) 

半敞开“小车”式外环吹风结构， 线下维护生产连续性好，可移位设计便利生产操作。With semi-open cart type outward annular blow structure, it has advantages of off-line maintenance for uninterrupted production as well as mobile design for easy operation.

3.1  一代：手动螺旋升降结构 Generation 1: Manual spiral up/down structure

结构简单、性能稳定、维护费用低Simple structure, steady performance, low maintenance cost

3.2  二代：双气缸升降结构 Generation 2: Double cylinder up/down structure

操作简单，动作迅速，劳动强度低 Simple operation, fast execution, low intensity of manual labor 

3.3  三代：单气缸升降结构 Generation 3: Single cylinder up/down structure

解决了双气缸不同步导致的升降欠平稳问题，较双气缸结构简单，

相应降低了维护费用。It overcomes the problem of unsteady up/down due to unsynchronized double cylinders and it is simpler in structure than that of double cylinder