Crane control system and crane control method

A crane control system for controlling a crane that includes a leg structure standing on a quay,

• a girder part supported on the leg structure and having one end projecting to a sea side from the structure and another end projecting to a land side from the structure,
• a relay mounting platform which is configured to be movable in at least one of a vertical direction and an extending direction of the girder part at a center portion of the girder part in the extending direction and on which a container is temporarily mounted,
• a land-side cargo handling device which performs container handling between the relay mounting platform and a transportation vehicle stopped at a vehicle stop position under the other end of the girder part, and
• a sea-side cargo handling device which performs container handling between the relay mounting platform and a designated cargo handling position on a container ship moored under the one end of the girder part,
• wherein the crane control system comprises:
• a position acquisition device which acquires current positions of the land-side cargo handling device, the sea-side cargo handling device, and the transportation vehicle;
• and
• a control device which is connected to the sea-side cargo handling device, the land-side cargo handling device, the relay mounting platform, and the position acquisition device,
• the vehicle stop position and the cargo handling position have been set in the control device in advance, and
• the crane control system is configured such that when the control device predicts that a standby time will occur in a container handling operation by one cargo handling device among the land-side cargo handling device and the sea-side cargo handling device based on the set vehicle stop position, the set cargo handling position, and the current positions of the land-side cargo handling device, the sea-side cargo handling device, and the transportation vehicle acquired by the position acquisition device, the control device performs control that moves the relay mounting platform to a position which equalizes a cycle time of the container handling operation by the one cargo handling device including the predicted standby time and a cycle time of the container handling operation by the other cargo handling device with each other, and
• wherein the crane control system is configured such that the control device performs control that
• calculates an assumed position which equalizes an assumed land-side cycle time of the container handling operation by the land-side cargo handling device and an assumed sea-side cycle time of the container handling operation by the sea-side cargo handling device with each other based on the set vehicle stop position and the set cargo handling position, and
• predicts the standby time based on the calculated assumed position and the current positions of the land-side cargo handling device, the sea-side cargo handling device, and the transportation vehicle acquired by the position acquisition device on an assumption that the relay mounting platform is present at the assumed position.