A portal crane is a large piece of equipment commonly used in ports and shipyards for moving heavy loads. It consists of several main components：
1. Portal frame: The frame is a primary support structure that creates a bridge between two parallel rails and supports the crab, trolley, and hoist.
2. Crab: It is a movable part of the crane that travels along the portal frame in a lateral direction and supports the trolley and hoist.
3. Trolley: The trolley is a mechanism used by the crab for horizontal movement along the crane's beam or bridge. It also supports the hoist and the load.
4. Hoist: The hoist is a device that lifts and lowers the load. It consists of a motor, gearbox, wire ropes, and hooks.
5. Cab: It is the operator's control room located on the top of the crane. The cab houses the control panel, which enables the operator to control the movement and operation of the crane.
6. Power source: The power source could be either electric or hydraulic. Electric cranes are connected to power sources, while hydraulic cranes use a hydraulic power pack.
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