Self-Deploying Container Lashing for High-Roll Ship Stability
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Solution Overview
Problem
Existing lashing systems for securing shipping containers on cargo ships are inadequate in withstanding high acceleration levels caused by the ship's pitch and roll, leading to destabilization, and are heavily reliant on manual labor for deployment.
Innovation Solution
A lashing apparatus with a motorized pull-in winch, pull-in line, and a releasable connector system, which includes a lock with a socket to securely fasten the lashing to shipping containers, reducing manual labor and enhancing stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual lashing systems are used to secure shipping containers, then deployment is simpler and requires less complex equipment, but the system cannot provide acceptable restraint levels under high acceleration conditions and requires significant manual labor
Solution Approach 1:
The lashing system is designed to deploy and secure containers automatically without requiring manual intervention. The motorized winch self-activates to tension the lashing line, and the container's interlocking system self-engages with the lashing apparatus, enabling the system to service itself during deployment.
Solution Approach 2:
Manual mechanical operations are replaced with an automated motorized winch system that uses electrical motors to tension and secure the lashing line. This substitution eliminates the need for manual labor while providing consistent, reliable restraint forces under high acceleration conditions.
2Productivity
If containers are stacked higher to increase cargo capacity, then shipping efficiency improves, but the movement and destabilization of upper containers increases due to ship pitch and roll
Solution Approach 1:
The lashing system is pre-configured and automatically deployed before the ship encounters rough seas or before containers are stacked to high positions. The motorized winch pre-tensions the lashing line, and the interlocking system pre-engages, preparing the restraint mechanism in advance to counteract future pitch and roll movements.
Solution Approach 2:
The system changes the restraint parameters by using motorized tensioning to apply optimal lashing forces and by utilizing the container's interlocking system to create geometric constraint configurations. These parameter changes enable stable stacking at higher positions by dynamically adjusting restraint forces.
3Ease of operation
If conventional lashing systems are used, then deployment requires significant manual labor, but automated systems increase device complexity
Solution Approach 1:
The lashing apparatus is designed with multi-functionality: the motorized winch serves both as a tensioning device and an anchoring mechanism, the interlocking system provides both structural support and restraint functions, and the same apparatus can lash containers at various heights. This universality reduces the need for multiple separate systems.
Solution Approach 2:
The system merges the lashing mechanism with the container's existing interlocking system, combining two functions into one integrated apparatus. The motorized winch is integrated with the lashing line and container interface, eliminating the need for separate manual operations and reducing overall system complexity.
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 system provides improved stability and reduces reliance on manual labor by automating the lashing process, effectively securing containers even in rough seas.
Implementation Method 1
a motorized pull-in winch attached to the support; electronics circuitry configured to drive the motorized pull-in winch for lifting or lowering the pull-in line
Implementation Method 2
The fastening line is sufficiently stiff to withhold tension caused by the movements of the shipping containers
Data Source
AI summary
In order to stabilize the shipping containers that are stored on a cargo ship between a first column of shipping containers stacked at the starboard side of the cargo ship and a second column of shipping containers stacked at the port side of the cargo ship, supports are coupled to the tops of the first and second columns and foundations are coupled to the lashing bridge. Lashing are installed diagonally between the supports and the foundations using motorized pull-in winches. Tension is applied to the lashings spanning between the supports and the foundations using tensioning winches attached to the foundations.