Oscillating Spray Head for Can End Coating
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Solution Overview
Problem
Existing post repair machines and spray assemblies for can ends suffer from inefficiencies in applying coatings to can ends of varying sizes, often resulting in damage to protective coatings during the scoring process, leading to oxidation, corrosion, or rust.
Innovation Solution
A spray assembly with an oscillating spray head that includes a power source and motion control mechanism, featuring a pivot member with multiple spray guns that move in an oscillating motion to efficiently apply coatings to can ends of different diameters, reducing overspray and allowing for precise coating application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single spray gun is used to apply coating to can ends, then the device complexity is reduced, but the productivity decreases due to the need to rotate the spray gun at high speed to cover all can ends
Solution Approach 1:
The single spray gun is divided into multiple spray guns (typically three) arranged in a triangular configuration. Each spray gun covers a specific sector of can ends passing through the assembly, eliminating the need for high-speed rotation and enabling simultaneous coating of multiple can ends.
Solution Approach 2:
The spray guns are mounted on oscillating mechanisms that move them dynamically between spray and non-spray positions. This dynamic positioning allows each spray gun to coat can ends only when needed, improving efficiency while maintaining a relatively simple overall assembly structure.
2Productivity
If a spray gun rotates at high speed to cover all can ends, then the productivity is improved, but the manufacturing precision deteriorates due to difficulty in controlling coating application at varying speeds
Solution Approach 1:
Each spray gun is equipped with an oscillating mechanism that dynamically adjusts its position. The spray guns move into the spray position only when a can end is properly positioned, and retract when not needed. This dynamic control ensures consistent coating application regardless of the varying linear speed of can ends, eliminating the precision problems associated with high-speed rotation.
Solution Approach 2:
The oscillating mechanisms are controlled by feedback from the can end positioning system. When a can end enters the spray zone, the system activates the appropriate spray guns; when it leaves, the guns retract. This feedback-based control ensures precise coating application timing and consistency.
3Ease of operation
If the spray gun is positioned to cover the center of can ends, then the ease of operation is improved, but the object-affected harmful factors increase due to overspray on non-scored areas
Solution Approach 1:
Instead of a single centrally positioned spray gun, multiple spray guns are positioned at different locations (typically forming a triangle) with each gun targeted at a specific can end sector. This local positioning ensures that each spray gun coats only the scored area of its designated can ends, eliminating overspray on non-scored areas while maintaining ease of operation.
Solution Approach 2:
The coating task is segmented into multiple zones, with each spray gun responsible for a specific sector. This segmentation allows precise targeting of scored areas only, preventing harmful overspray while keeping the system easy to operate through automated sector-based activation.
4Object-affected harmful factors
If multiple spray guns are used to reduce overspray, then the object-affected harmful factors are reduced, but the device complexity increases
Solution Approach 1:
The spray assembly uses multiple spray guns positioned to cover different can end sectors, with each gun targeted at specific scored areas. This segmentation reduces overspray by limiting each gun's coverage to only where needed.
Solution Approach 2:
The multiple spray guns are mounted on oscillating mechanisms that simplify the overall assembly structure. The oscillation allows the guns to move between spray and retracted positions automatically, reducing the need for complex individual positioning mechanisms for each gun while maintaining overspray reduction benefits.
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 oscillating spray head effectively applies coatings to numerous can ends with minimal waste, ensuring thorough repair and protection of the scored areas while accommodating various can end sizes, reducing the risk of oxidation and corrosion.
Implementation Method 1
Each of the spray guns is structured to apply the coating to a corresponding portion of each can end
Data Source
AI summary
A spray assembly includes a power source, a motion control mechanism such as a cam box, and at least one spray head structured to apply a coating to a plurality of can ends. Each spray head includes a mounting member, a pivot member, a gun assembly including a plurality of spray guns, and a transfer mechanism for transferring a predetermined motion induced by the cam box from the cam box to the pivot member. Each of the spray guns applies the coating to the can ends in accordance with the predetermined motion. Preferably the predetermined motion as an oscillating motion transferred to the pivot member by belts, thereby oscillating the spray guns. The spray assembly may include a plurality of spray heads, wherein can ends of the same or different sizes are transferred in lanes to a corresponding one of the spray heads.