PLC -Controlled Automated Roller Wall Painting System

Abstract

Wall painting is a crucial but laborious process in construction and renovation, often requiring significant manual effort and time. Traditional painting methods involve human painters applying paint using rollers or brushes, typically resulting in fatigue, uneven coverage, material wastage, and health risks due to long-term exposure to chemical fumes. As buildings become taller and demands for high-quality finishes grow, the need for automation in painting becomes increasingly evident. To address these challenges, this study presents the design and development of an automated roller wall painting system governed by a Programmable Logic Controller (PLC). The system is engineered to ensure consistent paint application, optimize paint use, and reduce the reliance on manual labor. A lead screw mechanism enables the roller’s vertical motion, while a motorized trolley facilitates horizontal advancement. Combined with a controlled paint flow system and sensor-based feedback, the solution is intelligent and responsive. The painting system is operated through a central PLC that interprets inputs from proximity sensors and controls the movements of the roller and trolley in a predefined sequence. Additionally, a Human-Machine Interface (HMI) allows real-time monitoring and control of parameters such as roller speed and paint flow. This ensures flexibility and adaptability to different wall sizes and surface types. The system’s design makes it suitable for deployment in industrial and residential settings. Initial testing of the prototype revealed encouraging results. Paint was applied uniformly, transitions between vertical and horizontal motions were smooth, and sensors reliably triggered actions at the appropriate times. Paint wastage was minimized due to the precise control of paint delivery, and the roller only operated when required. These features contribute significantly to the system’s cost-effectiveness and sustainability. The proposed solution, therefore, is a promising step towards automating one of the most repetitive and physically demanding tasks in the construction industry. It offers a practical alternative to manual painting, increasing operational safety, reducing costs, and ensuring higher-quality finishes. This system is a demonstration of how automation can be applied to everyday tasks to improve efficiency and quality.