Projecting Lifting Crane Structure for Flexible Dock Release
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Solution Overview
Problem
Existing cranes for handling boats and bulky objects are limited by their structure, which requires positioning astride the release area, restricting release locations to specific configurations and necessitating additional operations for non-standard sites.
Innovation Solution
A crane design with a projecting lifting portion outside the main frame, allowing single-point ground positioning and enabling release or pickup of loads without requiring two ground-bearing points, adaptable to various site morphologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a double-gantry structure is used for crane stability, then the crane can support heavy loads, but the crane must be positioned astride the release area, limiting release locations to specific configurations
Solution Approach 1:
The lifting portion is extended beyond the plane defined by the motion members, projecting in a direction substantially perpendicular to the longitudinal axis of the crane frame. This dimensional extension allows the lifting portion to reach over water or uneven terrain without requiring the entire crane structure to be positioned astride the release area, thereby maintaining stability while increasing adaptability to various site morphologies
Solution Approach 2:
The crane is divided into distinct functional segments: the stable double-gantry frame with motion members that remains grounded for stability, and the extended lifting portion that can reach over water or uneven terrain. This segmentation allows each part to perform its optimal function - the frame provides stable support while the extended lifting portion provides versatility in load placement
2Strength
If a double-gantry structure is used, then the crane maintains structural integrity, but additional operations and equipment are required for docks or quays facing water
Solution Approach 1:
By extending the lifting portion beyond the plane of the motion members in a direction perpendicular to the longitudinal axis, the crane can directly place loads over water from a single grounded position, eliminating the need for additional operations or equipment that would otherwise be required when the release area faces water
3Reliability
If fixed handling systems are used, then load handling is reliable, but the systems cannot be moved easily and require site preparation
Solution Approach 1:
The crane incorporates motion members (wheels or tracks) that allow the entire structure to move along rails or ground surfaces. This dynamic capability enables the crane to be relocated to different positions while maintaining its reliable double-gantry structure, eliminating the need for fixed installation and extensive site preparation while preserving handling reliability
Data Source
AI summary
A crane includes: a first frame to which one or more motion units are coupled, each motion unit being configured for the support and motion of the crane on the ground and a second frame installed on said first frame, where the second frame includes a lifting portion including one or more lifting supports. The lifting portion is arranged projecting with respect to the first frame in such a manner that a projection on the ground of the lifting portion is arranged alongside a projection on the ground of the first frame.