Transfer Device Dynamic Acceleration Control for FOUP Stability
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Solution Overview
Problem
Articles with a center of gravity offset from the center position during transfer can experience lifting or tilting issues when supported from below, leading to potential dropping or collision with overhead transport vehicles.
Innovation Solution
A transfer device with a controller that adjusts acceleration and deceleration rates to mitigate lifting by implementing specific control strategies based on the orientation of the article's unbalanced center of gravity relative to the transfer direction, including varying maximum acceleration and deceleration values to stabilize the article during movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an article with offset center of gravity is supported from below during transfer, then the article can be transported, but lifting or tilting occurs causing instability and potential collision
Solution Approach 1:
The patent changes the acceleration and deceleration parameters dynamically based on the article's center of gravity position. When the center of gravity is offset toward the first end, the system reduces acceleration and increases deceleration magnitude to prevent the first end from lifting up, thereby maintaining article stability during transfer
Solution Approach 2:
The transfer device employs dynamic control by adjusting acceleration and deceleration rates according to the real-time position of the article's center of gravity. This dynamic parameter adjustment prevents lifting and tilting that would occur with fixed acceleration profiles, resolving the stability issue
2Productivity
If maximum acceleration is increased to improve transfer speed, then productivity increases, but lifting-up of the article occurs more frequently
Solution Approach 1:
The system dynamically adjusts acceleration parameters based on the article's center of gravity position. When the center of gravity is offset, the maximum acceleration is reduced to prevent lifting, while maintaining higher acceleration when the center of gravity is centered, thus balancing productivity and stability
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 solution effectively reduces or prevents lifting of articles during transfer, enhancing stability and preventing collisions, thereby improving the reliability of overhead transport operations.
Implementation Method 1
When the article accelerates or decelerates in a state in which a portion of the article is supported from below, a moment is exerted on the article, and the back end or the front end in the transfer direction of the article is sometimes lifted up
Data Source
AI summary
A transfer device includes a controller configured or programmed to perform at least one of a first control to make a maximum acceleration when moving a FOUP to a front end side smaller than a maximum acceleration when moving to a back end side, a second control to make a maximum deceleration when moving the FOUP to the front end side greater than a maximum deceleration when moving to the back end side, a third control to make the absolute value of the maximum deceleration when moving the FOUP to the front end side greater than the absolute value of the maximum acceleration, and a fourth control to make the absolute value of the maximum acceleration when moving the FOUP to the back end side greater than the absolute value of the maximum deceleration.