The connections between trash rack and hoist as well as between service gate and hoist are achieved by hoisting chain that is apt to place and is time saving without tearing down pull rod.

This text regards the security of the gates and hoists as the research object.

Gantry crane is the indispensable one of the large-scale equipments in hydropower station, the gantry cranes which are used in hydropower to open and close sluice gates are named gantry hoists.