Compliant Tool Head for Wet Coating Automation
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Solution Overview
Problem
Existing automated systems for applying wet coatings, such as render material, on building surfaces face challenges due to surface variations, leading to uneven application and affecting aesthetics and performance, as they rely on sensors with limited accuracy and cannot effectively handle irregular surfaces.
Innovation Solution
An apparatus with a compliance module and tool head that maintains contact with the wet coating through a biasing module and sensor feedback, allowing the tool to adjust its path and stiffness to accommodate surface variations, ensuring consistent application despite inaccuracies in surface mapping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automated rendering systems use sensors with limited accuracy (±5mm to ±25mm) to scan building surfaces, then automation is achieved and productivity increases, but the surface variations (±6cm on 6m walls) cause uneven wet coating application
Solution Approach 1:
The tool head is made dynamically compliant through a biasing module (spring) that allows continuous adjustment of the tool's position relative to the arm. This dynamic compliance enables the tool to automatically adapt to surface variations during movement, maintaining consistent contact pressure and coating uniformity despite the limited accuracy of automated positioning systems.
2Manufacturing precision
If manual rendering processes are used to achieve precise and uniform application, then coating quality is improved, but time consumption and labor expertise requirements increase
Solution Approach 1:
The biasing module acts as a mechanical intermediary between the automated arm and the coating tool. It translates the automated system's positional errors into controlled tool head movements, allowing the tool to maintain proper contact with the surface without requiring manual intervention or highly accurate sensor data.
3Manufacturing precision
If the tool head is made compliant with a biasing module to accommodate surface variations, then coating uniformity is improved, but device complexity increases
Solution Approach 1:
The compliance of the tool head is adjusted by changing the stiffness parameter of the biasing module (spring). This single parameter change allows the system to adapt to different surface conditions and coating requirements without redesigning the entire tool head structure, maintaining simplicity while achieving precision.
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 apparatus ensures a consistent and smooth application of wet coatings on varying surfaces, improving the aesthetic and performance outcomes by maintaining contact and adjusting to surface irregularities, thus enhancing the thermal properties, structural integrity, and weatherproofing of the building.
Implementation Method 1
the compliance module comprises a biasing module arranged to urge the tool in the stroke direction to maintain contact with the wet coating to work the wet coating
Data Source
AI summary
An apparatus for working a wet coating, such as render material, applied to a surface, the apparatus comprising: an actuator arranged to move an arm across a surface having a wet coating applied thereon; a controller configured to move the arm across the surface along a tool path; and a tool head mounted to the arm, the tool head comprising a compliance module and a tool mounted to the compliance module such that the tool is movable in a stroke direction towards the surface relative to the arm. The compliance module comprises a biasing module arranged to urge the tool in the stroke direction to maintain contact between the tool and the wet coating such that the tool works the wet coating as the arm moves across the surface.