Movable Shelf Plate Deflection Control in Semiconductor Storage
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Solution Overview
Problem
Conventional storage shelves in semiconductor manufacturing facilities experience deflection issues when movable shelf plates advance to transfer articles from overhead transport vehicles, and there is a need for increased storage capacity to accommodate higher throughput.
Innovation Solution
The design incorporates a storage shelf with a pair of storage portions connected by guides, featuring a movable shelf plate that is driven along these guides, reducing deflection and allowing for increased storage capacity by supporting articles on both fixed and movable shelf plates, with the option to detach and replace faulty components for easy maintenance and installation flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a movable shelf plate advances from a storage portion to a transfer position below an overhead transport vehicle, then article transfer capability is enabled, but deflection occurs in the storage shelf
Solution Approach 1:
The storage shelf is divided into multiple storage portions with individual movable shelf plates that can independently advance to transfer positions. This segmentation allows controlled movement of only the necessary shelf plate while maintaining stability in other portions, reducing overall deflection.
Solution Approach 2:
Multiple storage portions are combined in a shared support structure with common guides and drivers. The guides from facing storage portions are connected by connectors, creating a unified rigid framework that supports multiple movable shelf plates simultaneously, reducing deflection through distributed load bearing.
2Productivity
If storage shelves are designed to store a larger number of articles to accommodate increased throughput, then productivity is improved, but structural deflection increases
Solution Approach 1:
Storage portions are arranged in multiple dimensions including vertical stacking and horizontal expansion. By utilizing three-dimensional space efficiently, the system increases article storage capacity without proportionally increasing the span of individual shelf structures, thereby maintaining structural rigidity and reducing deflection.
Solution Approach 2:
Multiple storage portions share common support structures, guides, and connectors. This merging creates a distributed load-bearing system where the weight and movement forces of multiple articles are shared across the entire structure, preventing excessive deflection even as total storage capacity increases.
3Adaptability or versatility
If drivers and drive controllers are integrated on each movable shelf plate for individual control, then operational flexibility is improved, but device complexity increases
Solution Approach 1:
The driver and drive controller units are designed as standardized, universal components that can be installed on any movable shelf plate. This universality allows individual control of each shelf plate while using identical hardware designs, reducing the complexity of managing diverse control systems across multiple shelf plates.
Solution Approach 2:
Each movable shelf plate is equipped with its own driver and drive controller, enabling autonomous operation and control. The shelf plates can independently advance, retract, and position themselves without requiring complex centralized control mechanisms, simplifying the overall control architecture while maintaining operational flexibility.
Data Source
AI summary
A storage shelf includes a body and a pair of storage portions in the body and facing each other across a predetermined area. The pair of storage portions includes a shelf plate movable with respect to the body and to support an article, a guide extending in a facing direction of the pair of storage portions to guide movement of the movable shelf plate, a driver to move the movable shelf plate along the extending direction of the guide, and a drive controller to control the driver. The guides facing each other in the pair of storage portions are connected by a connector in the area, and the connector guides the movement of the movable shelf plate to the area.