Gap-Jumping Overhead Crane End Truck Design
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Solution Overview
Problem
Existing overhead cranes face challenges in seamlessly transitioning between indoor and outdoor areas, often requiring large interior spaces for truck loading/unloading and compromising security and climate control due to the need for custom or open doors to accommodate continuous runways.
Innovation Solution
A gap jumping overhead crane with specialized end trucks and load wheels, allowing the crane to traverse gaps between runways, enabling standard doors to close while maintaining operational continuity across indoor and outdoor spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If continuous runways are used to span indoor and outdoor areas, then operational continuity is improved, but security and climate control deteriorate due to inability to close standard doors
Solution Approach 1:
The runway is segmented into discrete sections with gaps between them. The end truck is equipped with multiple load wheels (at least three) and guide wheels (at least three) that can bridge these gaps. This segmentation allows the door to close over the gap in the runway, restoring security and climate control while the multi-wheel end truck maintains operational continuity by spanning the gap.
2Productivity
If large interior spaces are allocated for truck loading and unloading, then loading efficiency is improved, but space utilization deteriorates due to wasted interior area
Solution Approach 1:
The loading and unloading operation is extracted from the interior space and moved to the exterior area. The gap-jumping end truck enables the crane to extend its operation through the door opening to outdoor areas, allowing trucks to be loaded/unloaded outside the building. This eliminates the need for large interior loading zones while maintaining loading efficiency.
3Reliability
If standard doors are used to close openings, then security and climate control are improved, but device complexity increases due to need for gap-jumping mechanism
Solution Approach 1:
The end truck is designed with dynamic characteristics to handle the gap-crossing operation. It has at least three load wheels and at least three guide wheels that can accommodate the transition from supported to unsupported runway sections. This dynamic design allows the relatively simple solution of using standard doors while the end truck adapts to the gap condition.
Data Source
AI summary
A gap jumping overhead crane for use with two parallel runways each having a first and second end and a gap between their first and second ends. The crane has a hoist mounted on a bridge having opposing ends that extends between the two parallel runways. The bridge is slidably mountable to the two parallel runways at each of its ends by an end truck. Each end truck has two ends and at least three load wheels attached to the end truck. At least two of the load wheels are separated by a distance greater than the size of the gap to permit the crane to cross the gap in the runways.