Cable-Driven Crane Arms for Vessel Barge Loading
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Solution Overview
Problem
Existing barge loading systems in dredging operations face limitations in the movement and positioning of discharge heads due to reliance on hydraulic actuators, which can be cumbersome and prone to damage, and lack the flexibility needed for precise positioning over a secondary vessel.
Innovation Solution
The use of cable systems with rotatable base and remote arm portions connected to a discharge head, allowing for independent and synchronous movement of crane arms, enabling the discharge head to be positioned accurately over a secondary vessel without hydraulic fluids and with reduced mechanical stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If hydraulic actuators are used to move the discharge head, then the discharge head can be positioned over the secondary vessel, but the system becomes cumbersome and prone to damage
Solution Approach 1:
The patent replaces hydraulic actuators with a cable-driven mechanical system. The discharge head is moved by cables that are reeled in and out, eliminating hydraulic fluids and associated components. This substitution reduces the risk of hydraulic leaks and mechanical damage while maintaining positioning capability.
Solution Approach 2:
The patent extracts the hydraulic system from the crane arm structure and replaces it with a cable system. By removing the hydraulic actuators and their associated piping, the system becomes less cumbersome and more reliable, as cables are simpler and more damage-resistant components.
2Ease of operation
If hydraulic actuators are used for moving the discharge head, then positioning is achieved, but flexibility and precision are limited
Solution Approach 1:
The patent implements a dynamic cable system where the length of cables can be continuously adjusted by reeling mechanisms. This allows the discharge head to be positioned dynamically at various locations and angles, providing greater flexibility and precision compared to fixed hydraulic actuators. The cable system can adapt to different positioning requirements smoothly.
3Power
If hydraulic fluids are used in the crane system, then actuation is achieved, but maintenance requirements increase
Solution Approach 1:
The patent substitutes hydraulic actuation with a purely mechanical cable-based system. Power is transmitted through cables that are reeled in and out using winches or similar mechanisms. This eliminates hydraulic fluids, seals, and pumps that require maintenance, significantly reducing maintenance needs while retaining actuation capability.
4Stability of the object's composition
If rigid discharge head positioning is used, then structural stability is maintained, but operational flexibility is reduced
Solution Approach 1:
The patent uses a cable-driven system that allows the discharge head to be positioned at various angles and locations while maintaining its structural integrity. The cables provide controlled movement without compromising the rigidity of the discharge head itself, enabling both stability and flexibility.
Data Source
Figure 1a
Figure 1b
Figure 1c
AI summary
The invention relates to a vessel comprising a barge loading system (10) for loading a secondary vessel positioned alongside the vessel (1) with a mixture of water and material, comprising a discharge pipe (11) and a discharge head (12). The barge loading system (10) comprising at least two moveable crane arms (20) connected to the discharge head (12). The crane arms (20) being arranged to move the discharge head (12) to an overboard position. The crane arms (20) comprise respective base arm portions (21) rotatably connected to a deck (2) of the vessel (1) and respective remote arm portions (22). The remote arm portions (22) are with one end rotatably connected to respective base arm portions (21) and with another end connected to the discharge head (12). The barge loading system (10) comprises cable systems arranged to move the base arm portions (21) and the remote arm portions (22).