Rotatable OHT Rail Joint for Flexible Wafer Transport Routing
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Solution Overview
Problem
Existing OHT systems in semiconductor manufacturing have fixed rails that limit flexibility in route planning and vehicle movement, restricting the efficiency of wafer transportation due to the inability to transfer between different tracks or make U-turns without nodes.
Innovation Solution
The implementation of rotatable turntables with non-stationary rails that can align with fixed rail segments, allowing OHT vehicles to change tracks, make U-turns, or serve as passing bays, enhancing route flexibility and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed rail routes are used in OHT systems, then system simplicity and reliability are improved, but route flexibility and transportation efficiency deteriorate
Solution Approach 1:
The patent applies the dynamics principle by making the rail system movable through turntables. The turntables enable rails to change orientation dynamically, allowing OHT vehicles to transfer between different rail segments in multiple directions. This transforms the previously static fixed rail system into a dynamic one that can adapt routes in real-time, resolving the contradiction between system reliability (maintained through controlled movement) and route flexibility (achieved through dynamic reconfiguration).
2Device complexity
If OHT vehicles transfer to different rails at fixed nodes only, then system complexity is reduced, but transportation efficiency and route optimization are limited
Solution Approach 1:
The patent applies segmentation by dividing the rail system into multiple independent segments connected by turntables. Each rail segment can be independently controlled and positioned, allowing vehicles to transfer at multiple points along the route rather than only at fixed nodes. This segmentation enables more frequent and flexible transfers, improving transportation efficiency without requiring complete system redesign.
Solution Approach 2:
The turntable acts as an intermediary mechanism between fixed rail segments. It mediates the transition from static to dynamic routing by providing a controlled interface where rails can rotate and align with different segments. This intermediary enables efficient route optimization while maintaining manageable system complexity through localized rather than system-wide changes.
3Device complexity
If U-turns are required for direction changes, then rail configuration is simplified, but transportation time and operational efficiency increase
Solution Approach 1:
The patent applies inversion by changing the traditional approach to direction changes. Instead of requiring vehicles to perform U-turns (reversing direction), the turntables invert the mechanism by rotating the rail itself to provide direct access to rails extending in the desired direction. This allows vehicles to continue moving forward while the rail orientation changes, eliminating time-consuming reversals and reducing transportation time.
Data Source
AI summary
A system according to the present disclosure includes a first fixed rail segment, a second fixed rail segment aligned with the first fixed rail segment along a first direction, a rotatable rail joint disposed between the first fixed rail segment and the second fixed rail segment along the first direction, a hanger mechanically coupled to the rotatable rail joint, a powered rotational mechanism housed in the hanger. The rotatable rail joint includes at least one rotational rail that is aligned with the first fixed rail segment and the second fixed rail segment when the rotatable rail joint rotates to an alignment position is not aligned with the first fixed rail segment and the second fixed rail segment when the rotatable rail joint rotates out of the alignment position.