Mobile Cleaning Stations for Spray Booth Color Changes
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Solution Overview
Problem
Current spray booth systems experience significant downtimes and material waste due to color changes, which are costly and inefficient, especially when producing small batches or customized products, hindering the adoption of modern production methods like Just In Time (JIT) and Lean Production.
Innovation Solution
The implementation of a spray booth with two mobile cleaning stations, one on each side of the spray booth, allows for simultaneous painting and cleaning operations, enabling quick color changes without stopping the production process. This setup includes a draining tube, compressed air supply, and a cleaning brush, with the option to omit solvent use when switching between chemically compatible paints, and can be retrofitted into existing production lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the spray booth stops production to clean spraying tools for color changes, then cleaning effectiveness is improved, but productivity and working time are reduced
Solution Approach 1:
The system enables continuous painting operation by performing cleaning of spraying tools during non-productive moments (between payloads) using automated cleaning stations. The cleaning process is integrated into the production cycle without interrupting the painting of current payloads, thus maintaining continuous useful action while ensuring thorough cleaning for color changes.
Solution Approach 2:
The cleaning stations are positioned and configured to clean the spraying tools in advance before the next color change is needed. The system prepares the spraying tools for upcoming color changes by performing cleaning operations during the time when the spray booth is painting other payloads, so that when color change is required, the tools are already ready.
2Reliability
If the spray booth stops production to clean spraying tools, then cleaning completeness is improved, but loss of time increases
Solution Approach 1:
The cleaning operation is performed continuously during non-productive intervals between payloads without requiring dedicated stopping time. The automated cleaning stations operate concurrently with payload handling, ensuring complete cleaning while minimizing interruption to the production flow.
Solution Approach 2:
The spraying tools are cleaned automatically by the cleaning stations without requiring manual intervention or dedicated cleaning stops. The system performs self-service cleaning during transitional periods, maintaining cleaning completeness while eliminating the need for additional downtime allocated specifically for cleaning operations.
3Reliability
If solvent is used for cleaning between color changes, then cleaning effectiveness is improved, but loss of substance and cost increase
Solution Approach 1:
The system changes the cleaning parameter from chemical (solvent-based) to physical (compressed air-based) cleaning. The cleaning stations use high-pressure compressed air to remove paint residues from spraying tools, eliminating the need for solvent consumption while maintaining effective cleaning capability for color changes.
4Reliability
If cleaning stations are fixed to the spray booth, then cleaning reliability is improved, but adaptability and ease of installation are reduced
Solution Approach 1:
The cleaning stations are designed with mobile and adjustable positioning systems that allow them to move along the spray booth and adapt to different spraying tool positions. This dynamic configuration enables the cleaning stations to maintain reliable cleaning contact with various spray guns while being easily installable and removable for retrofit applications.
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 solution minimizes downtime during color changes, maximizes working time, enables production of small batches, and supports Just In Time production techniques, reducing material waste and storage needs, while maintaining efficiency in both intermittent and continuous painting modes.
Implementation Method 1
At least a slot (8) supplying compressed air
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
Spray booth (100) for spraying pieces to be painted with a painting product, comprising: - a system (107, 113, 114) for conveying said pieces to be painted inside side booth; - a supplying circuit for supplying a painting product/solvent to painting tools (110); - a plenum; - at least a mobile wall (108) allowing to access the inside of said spray booth; - optionally a reading system for the pieces to be painted; - optionally a filtering system; - at least two spraying tools (110), comprising at least a spray gun (101, 102, 103, 104, 105) each placed on an independent arm (60, 60') moving on a plane and optionally in a vertical direction; comprising at least a cleaning station, preferably two cleaning stations (1, 1') placed in correspondence of said mobile wall (108), said cleaning station being provided with a drawer (5) mobile between a rest position and a cleaning position, said drawer (5) comprising: - a painting product/solvent draining tube (6) provided with a mouth (7); - at least one slot (8) for supplying compressed air; - at least one brush (9) for brushing said spray guns (101-105).