Load Port Door Linkage With Pressed Guide Roller Stability
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Solution Overview
Problem
In semiconductor manufacturing load ports, the separate drive mechanisms for opening and closing doors can generate particles and cause vibrations, leading to noise, wear, and potential door failures due to gaps formed between guide rollers and guide connection portions during directional changes.
Innovation Solution
A load port configuration with a link mechanism and a presser, such as an elastic member, that presses the guide roller toward the guide connection portion when changing directions, preventing gaps and reducing vibrations during door operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a guide roller is allowed to move freely along the guide groove to suppress particle generation, then particle generation is reduced, but gaps form between the guide roller and guide connection portion during directional changes, causing door vibration and noise
Solution Approach 1:
The presser applies a preliminary counteracting force to gravity before the guide roller can fall into the gap during directional changes. By pressing the guide roller against the guide connection portion in advance, the system prevents the harmful effect of gap formation and subsequent door vibration, rather than merely reacting after the problem occurs.
Solution Approach 2:
The presser acts as an intermediary component between the guide roller and the external control system. It mediates the interaction by providing continuous contact force to maintain proper engagement between the guide roller and guide connection portion, eliminating the need for precise mechanical tolerances while preventing vibration and noise.
2Reliability
If the door opening/closing speed is lowered to prevent vibration and noise, then door stability is improved, but the door opening/closing operation time becomes longer
Solution Approach 1:
The presser prepares the guide roller for directional changes by maintaining continuous contact and preventing gap formation before the actual direction change occurs. This preliminary preparation allows the door to move at higher speeds without experiencing vibration or noise, as the problematic gap formation is prevented in advance.
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
This configuration suppresses door vibrations, prevents noise and wear, and allows for faster door opening and closing, thereby improving operational efficiency and reducing particle generation.
Implementation Method 1
a presser provided to press the guide roller toward a guide connection portion when the guide roller passes through the guide connection portion
Data Source
AI summary
A load port includes: a plate-shaped base member having an opening via which a transfer target object is loaded and unloaded; a door member capable of opening and closing the opening; a link mechanism including a link member having one end rotatably connected to the door member; a guide roller configured to move together with the door member; a guide surface bent to extend from a first direction to a second direction and configured to guide the guide roller; a drive member to which the other end of the link member is rotatably connected; and a driver configured to move the drive member in the second direction.