Tiltable Roll Brush Substrate Cleaning via Air Bag Pressure Control
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Solution Overview
Problem
Conventional substrate cleaning apparatuses using vertically arranged roll brushes are inefficient in cleaning the edge regions of substrates due to decreasing contact frequency as the brushes rotate, leading to uneven cleaning compared to the center.
Innovation Solution
A substrate-cleaning apparatus with a tiltable roll brush system, where the roll brush is coupled to a tilting arm and adjusted by a controller regulating the internal pressures of air bags to maintain consistent contact across the substrate edge and center, ensuring efficient cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If roll brushes have fixed outer diameters and rotate at the same speed as the substrate, then the center region is cleaned effectively, but the edge region cleaning efficiency decreases
Solution Approach 1:
The roll brush is made tiltable through a mechanism including a tilting arm, support arm, springs, and air bags, allowing the brush inclination angle to be dynamically adjusted. This enables the outer diameter of the roll brush to change effectively, increasing contact frequency at the substrate edge while maintaining appropriate contact at the center, thus resolving the contradiction between center and edge cleaning efficiency
Solution Approach 2:
The inclination angle of the roll brush is adjusted as a controllable parameter. By changing this parameter, the effective outer diameter of the roll brush changes, which directly affects the contact frequency between the brush and substrate at different radial positions. This parameter adjustment optimizes cleaning uniformity across the entire substrate surface
2Productivity
If the roll brush is tilted to increase edge contact frequency, then edge cleaning improves, but the contact pressure distribution becomes uneven
Solution Approach 1:
Air bags are used as the actuating mechanism to tilt the roll brush. The air bags can be independently controlled to adjust the inclination angle precisely. This pneumatic system provides smooth, controllable force application that ensures uniform contact pressure distribution across the brush-substrate interface while maintaining the desired tilt angle for improved edge cleaning
Solution Approach 2:
The control system monitors the contact pressure distribution and adjusts the air bag pressures accordingly to maintain optimal contact conditions. This feedback mechanism ensures that when the roll brush is tilted to improve edge cleaning, the contact pressure remains evenly distributed across the entire brush width, preventing localized over-compression or insufficient contact
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 tiltable roll brush system ensures uniform cleaning efficiency across the entire substrate by adjusting the inclination of the roll brush, increasing contact pressure and rotational stiffness, thereby improving the cleaning of both edge and center regions.
Implementation Method 1
a first air bag and a second air bag mounted between the tilting arm and the support arm, and a controller configured to adjust a first internal pressure of the first air bag and a second internal pressure of the second air bag
Data Source
AI summary
A substrate-cleaning apparatus may include a tilting arm to which a roll brush and a motor are coupled, a support arm positioned on the tilting arm, a first spring and a second spring coupling the tilting arm to the support arm, a first air bag and a second air bag mounted between the tilting arm and the support arm, and a controller configured to adjust an internal pressure of each of the first air bag and the second air bag. The controller may adjust a difference in internal pressure between the first air bag and the second air bag to control the inclination of the roll brush, and may adjust the internal pressure of each of the first air bag and the second air bag to move the roll brush vertically.