Fender Davit Hauling Line Tension Control
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Solution Overview
Problem
Existing fender davit systems often experience breaking or tangling of hauling lines due to sudden changes in tension when marine structures moored near each other experience differential rolling, leading to damage and operational disruptions.
Innovation Solution
A fender davit device with a hauling line tension maintaining part that includes a first idle pulley, a tensioner, and a slider, which adjusts and maintains the tension of the hauling line within a predetermined range using a spring mechanism and sheave blocks to prevent breakage and tangling, allowing for stable operation without the need for continuous winch operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a simple hauling line is used to hold the fender, then the device complexity is low, but the hauling line breaks or tangles when marine structures experience differential rolling
Solution Approach 1:
An idle pulley is introduced as an intermediary component between the winch and the fender. This pulley changes the direction of the hauling line and allows the tension to be distributed more evenly, preventing direct stress concentration on the hauling line during differential rolling of marine structures.
Solution Approach 2:
The system incorporates a movable pulley configuration that allows dynamic adjustment of the hauling line tension. The pulley can move freely along the hauling line to accommodate tension variations caused by rolling movements, maintaining optimal tension without breaking or tangling.
2Stability of the object's composition
If the hauling line tension is not maintained, then the device complexity is low, but the fender cannot be securely held during variable loads and movements
Solution Approach 1:
The idle pulley system operates autonomously to maintain tension without requiring continuous external control. The pulley naturally adjusts its position and the tension distribution based on the loading conditions, providing self-regulating tension maintenance that secures the fender during variable loads and movements.
3Force
If continuous winch operation is used to maintain tension, then the hauling line tension is controlled, but the operational complexity and energy consumption increase
Solution Approach 1:
Instead of continuous winch operation, the system uses periodic or intermittent tension adjustment. The idle pulley maintains tension through its mechanical configuration and gravitational forces, requiring the winch to operate only periodically to compensate for tension variations, thereby reducing energy consumption while maintaining effective tension control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents hauling line breakage and tangling by maintaining tension within a predetermined range, ensuring the fender is securely held and reducing the risk of damage to marine structures, even under varying loads and movements.
Implementation Method 1
a spring being arranged between the stationary axle and the roller
Implementation Method 2
a first idle pulley wound at an intermediate portion of the hauling line between the fender and the winch
Data Source
AI summary
A fender davit device is disclosed. The fender davit device in accordance with an aspect of the present disclosure includes a fender and a davit comprising a hauling line holding the fender and a winch configured to move the fender by winding or unwinding the hauling line. The fender davit device also includes a hauling line tension maintaining part configured to maintain a tension of the hauling line holding the fender to prevent the hauling line from breaking.