启闭机 meaning in English

head stock gear
headstock gear
hoist

Headstock gears with screw stem . types and basic parameters
螺杆式启闭机.型式和基本参数
Specification for headstock gears with screw stem
螺杆式启闭机.技术条件
Small and middle size hydraulic headstock gears . basic parameters
中小型液压闸门启闭机.基本参数
Hydropower and water resources specification for design of gate hoist
水电水利工程启闭机设计规范
Serial parameters of qp cable hoist
Qp型卷扬式启闭机系列参数

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