Transfer Plate Pin Sequencing for Buckle-Resistant Container Loading
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Solution Overview
Problem
Existing loading apparatuses for shipping containers apply significant force to one end of the transfer plate, leading to potential buckling and damage to articles, and face issues with pin alignment and smooth transition during loading/unloading.
Innovation Solution
A transfer plate mechanism with a first and second set of holes, synchronized carriages with extendable and retractable pins, and a controller to manage pin engagement and disengagement, ensuring smooth and damage-free loading/unloading by alternating pin sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If significant force is applied to one end of the transfer plate to push the load into the cargo space, then the loading operation can be completed, but the transfer plate may buckle and articles may be damaged
Solution Approach 1:
The single-point force application is segmented into multiple pin locations distributed along the transfer plate. The first set of pins and second set of pins are positioned at different locations, allowing the pushing force to be distributed across multiple engagement points rather than concentrated at one end, thereby preventing buckling and article damage while maintaining loading productivity
Solution Approach 2:
Different regions of the transfer plate are equipped with different sets of holes for different functions. The first set of holes is positioned for initial engagement and pushing, while the second set of holes is positioned for subsequent engagement. This local differentiation allows force to be applied at optimal locations for each stage of the loading operation, preventing harmful buckling effects
2Strength
If the transfer plate is thickened at one end in a wedge-like manner to accommodate forces, then buckling is prevented, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
Instead of creating a complex wedge-like thickened structure, the solution segments the force-bearing function into multiple pin engagement points. The transfer plate remains uniformly thick and simple in shape, while the distributed pin locations provide the necessary structural support to resist buckling forces without requiring complex manufacturing
Solution Approach 2:
The solution changes the parameter of force application from concentrated single-point loading to distributed multi-point loading. By engaging pins at multiple locations along the transfer plate, the effective load-bearing capacity increases without changing the physical dimensions or thickness of the plate, maintaining ease of manufacture while achieving adequate strength
3Ease of operation
If pins are extended to engage with holes in the transfer plate, then the transfer plate can be pulled smoothly, but alignment issues and transition problems occur
Solution Approach 1:
The controller is configured to extend the second set of pins into the second set of holes before retracting the first set of pins. This preliminary engagement ensures that the transfer plate is already secured by the second pin set before the first pin set disengages, preventing misalignment and ensuring smooth transition between pin sets during the pulling operation
Solution Approach 2:
The controller acts as an intermediary that coordinates the extension and retraction timing of the two pin sets. By controlling the sequence of operations—extending second pins before retracting first pins—the controller mediates the transition between different pin engagement states, ensuring smooth operation and preventing alignment issues
Data Source
Figure 1(a)~1(h)
Figure 2
Figure 3
AI summary
An apparatus for loading a shipping container, comprising a transfer plate having a first set of holes and a second set of holes therein and configured to slide, together with an article thereon, into and out of the shipping container, a transfer means positioned underneath the transfer plate having a first carriage with a first set of pins and a second carriage with a second set of pins, the first set of pins configured to extend into the first set of holes and the second set of pins configured to extend into the second set of holes to pull the transfer plate into and out of the shipping container, and a controller configured to extend the second set of pins into the second set of holes when the first sets of pins are already extended into the first set of holes.