Multi-Angle Metal Can Inspection for Full-Surface Defects
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing quality inspection systems for metal cans in high productivity manufacturing lines are inefficient in detecting fine material defects and structural issues, particularly in lithium-ion battery cans, due to the limitations of visual inspection methods and increasing production speeds.
Innovation Solution
An inspection unit comprising a plurality of camera units that capture images of cans from different viewing angles, coordinated with a conveying unit to ensure 100% surface scanning, with a processing unit to compare image parameters with predetermined standards, allowing simultaneous inspection of multiple cans and detection of defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If visual inspection systems with camera units are used to inspect can surfaces, then surface flaws can be detected, but fine pores or cuts and inner structural material defects are not detected
Solution Approach 1:
The inspection system is segmented into multiple specialized camera units, each targeting specific defect types: outer surface camera units for surface flaws, inner surface camera units for internal defects, and structure camera units for structural integrity. This segmentation allows each camera type to be optimized for its specific detection function, resolving the contradiction between surface inspection capability and overall defect detection reliability
Solution Approach 2:
The patent introduces water as an intermediary medium to enhance defect detection. Water is used to fill inner surfaces and cavities, enabling inner surface camera units to capture images of internal defects that would otherwise be inaccessible. This intermediary approach allows the system to detect both surface and inner structural defects without requiring physical contact with the can interior
2Ease of operation
If random sampling and manual inspection methods are used, then inspection simplicity is maintained, but inspection accuracy and productivity are insufficient
Solution Approach 1:
The patent replaces manual mechanical inspection with an automated optical inspection system. Multiple camera units capture images of cans during conveyance, and a computer automatically processes these images to detect defects. This substitution eliminates the need for manual inspection while dramatically increasing inspection speed and accuracy, resolving the contradiction between operational simplicity and productivity
Solution Approach 2:
The inspection system operates continuously as cans move through the conveyance line, with camera units constantly capturing images and the computer continuously processing data. This continuous operation eliminates the intermittent nature of manual sampling inspection, maintaining high productivity while ensuring every can is inspected without interruption
3Device complexity
If conventional visual inspection systems are used, then inspection setup is simple, but the system cannot keep up with increasing production speeds
Solution Approach 1:
The inspection system is divided into multiple parallel camera units that simultaneously inspect different cans or different surfaces of the same can. This segmentation allows the system to handle multiple inspection tasks in parallel, increasing overall inspection speed to match high production line speeds while maintaining a relatively simple modular structure that can be added incrementally
Solution Approach 2:
The patent transitions from single-point inspection to multi-dimensional simultaneous inspection by positioning multiple camera units at different locations and angles. This dimensional expansion allows the system to inspect multiple cans or multiple surfaces concurrently, dramatically increasing inspection throughput without proportionally increasing system complexity
Data Source
AI summary
An inspection unit for cans (11), in particular for metal cans used in metered dose inhalers or for the manufacture of batteries, comprising a visual inspection unit (9) comprising camera units (20), a conveying unit (8), wherein images of the individual cans are captureable by different camera units from different viewing angles, wherein the camera units each capture a plurality of cans simultaneously in an image comprising a plurality of image portions (24) including images of an outer surface portion of each of said plurality of cans from a different viewing angle, the image portions including images of outer side surface portions (22) and the outer bottom surface portion (19) of each can, the sum of the images of the outer side surface portions covering the entire outer side surface of the can; and a processing unit to process the captured images portions and to determine an inspection result.