Abstract:The bridgetype grab ship unloader initially designed by Fujian Datang International Ningde Power Generation Company Limited can guaranteed that the ship unloader could run under 20m/s wind speed. However, the situation is occasionally 31m/s wind speed, which means the initial design for ship unloader could hide trouble in safety and a modification needs to be done. This paper elaborate that the ship unloader could be modified through wheelpressure, rail clamping or rail brake’s antiwind device, and also gives merits and demerits to these methods. According to the ship itself, this paper suggests to install wheel gripper on the rail clamping device, hence substantially improves safety and reliability.

Keywords:ship unloder, wheel pressure anti wind device, rail clamping device, rail brakes, modification