Pre-cleaning Conveyor Racks in Electrophoretic Coating
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In single-loop systems for anti-corrosion coating of metallic components, the buildup of paint deposits on conveyor frames leads to inefficient operation and frequent maintenance, as alkaline cleaning and degreasing fail to effectively remove cathodic electrocoating residues, resulting in firmly adhering incrustations that require mechanical removal.
Innovation Solution
Incorporating a pre-cleaning step with an acidic aqueous agent containing phosphoric acid before the cleaning/degreasing treatment stage, ensuring the conveyor frames are contacted with an aqueous agent of sufficient acidity to effectively detach dip coating residues, thereby preventing the formation of incrustations and allowing continuous operation without the need for separate maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If alkaline cleaning and degreasing are used to remove paint deposits from conveyor frames, then the cleaning process is integrated into the production line, but the cathodic electrocoating residues firmly adhere and form incrustations that cannot be removed
Solution Approach 1:
The patent applies preliminary action by introducing an acidic pre-cleaning step before the main alkaline cleaning process. This pre-cleaning step protonates the cathodic electrocoating residues on the conveyor frames, making them soluble and removable. The acidic treatment prepares the surface by converting the adhering paint residues into a form that can be easily washed away by subsequent alkaline cleaning, thus preventing incrustation formation while maintaining continuous operation.
Solution Approach 2:
The patent changes the chemical parameter (pH) of the cleaning agent by using acidic compounds specifically for pre-cleaning the conveyor frames. This parameter change from alkaline to acidic conditions allows the selective removal of cathodic electrocoating residues without affecting the subsequent alkaline cleaning effectiveness. The acidic environment alters the chemical state of the paint residues, enabling their removal while maintaining system productivity.
2Reliability
If conveyor frames are mechanically cleaned to remove paint deposits, then complete removal is achieved, but system downtime increases and profitability decreases
Solution Approach 1:
The patent replaces the mechanical cleaning system with a chemical cleaning system. Instead of using mechanical methods (scrapers, brushes, or manual removal) to remove paint deposits, the invention uses acidic chemical agents that dissolve and wash away the cathodic electrocoating residues. This substitution eliminates the need for mechanical intervention, allows cleaning to occur during normal production operation, and prevents system downtime while achieving complete paint removal.
Solution Approach 2:
The conveyor frames perform self-service cleaning by passing through the acidic pre-cleaning station as part of their normal operational cycle. The chemical treatment automatically removes accumulated paint residues without requiring separate maintenance intervention. The system cleans itself during regular operation, eliminating the need for scheduled mechanical cleaning停机 and enabling continuous productivity.
3Productivity
If single-loop system is used for coating components, then process efficiency is improved, but paint deposits accumulate on conveyor frames requiring frequent maintenance
Solution Approach 1:
The patent introduces an acidic cleaning agent as an intermediary substance between the cathodic electrocoating process and the conveyor frame surface. This intermediary chemical medium facilitates the removal of paint deposits by reacting with and dissolving the residues. The acidic agent acts as a mediator that enables the single-loop system to maintain itself by continuously removing accumulated paint, thus reducing maintenance complexity while preserving process efficiency.
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 approach ensures continuous operation of the coating system by effectively removing paint residues from conveyor frames, eliminating the need for mechanical removal and maintaining system efficiency, thus enhancing the profitability of single-loop systems by allowing conveyor frames to repeatedly run through all treatment stages without downtime.
Implementation Method 1
bringing the conveyor frames and thus also the components to be coated on the conveyor frame into contact with an aqueous agent of suitable acidity containing phosphoric acid
Implementation Method 2
each component is picked up by a conveyor frame and the transport pair consisting of component and conveyor frame is then guided through all treatment stages
Data Source
AI summary
The present invention relates to a method for the anti-corrosion coating of metallic components in series, comprising multiple wet-chemical treatment stages including cathodic electrodeposition which concludes the coating process, in which method each component is received by a conveying rack and the transport pair consisting of a component and a conveying rack is then conducted through all treatment stages before the coated component is separated from the conveying rack and an uncoated component is received by the same conveying rack for coating, wherein the build-up of solid coating deposits on the conveying racks is prevented in the method by the incorporation of an additional treatment stage before degreasing/cleaning and the subsequent passivation and electrodeposition. As a result, in the method according to the invention, the coating process from pretreatment to electrodeposition can be carried out economically in a single system ("single loop") since individual conveying elements do not need to be discharged for the removal of coating deposits as a result of the incorporation of the precleaning stage. The coating constituents which are received on the conveying racks from the cathodic electrodeposition are effectively removed in the context of the present invention in that the conveying racks and thereby also the components to be coated which are received by the conveying rack are simply brought into contact with an aqueous medium of suitable acidity containing phosphoric acid before passing through the wet-chemical treatment stages for degreasing/cleaning, passivation and cathodic electrodeposition.