Empty Can Layer Vacuum Defect Detection
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Solution Overview
Problem
Existing methods for identifying and removing defective empty cans from layers are complex and time-consuming, requiring individual inspection which is inefficient in the beverage industry.
Innovation Solution
A method and device that utilize negative pressure to differentiate between intact and defective empty cans by applying a predefined limit value, where intact cans deform elastically and defective cans deform plastically or implode, allowing for their separation and removal before further processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual inspection methods are used to identify defective empty cans, then measurement precision is improved, but device complexity and processing time increase significantly
Solution Approach 1:
The patent replaces complex mechanical inspection systems with a pneumatic vacuum system. Instead of using mechanical sensors, cameras, or manual inspection mechanisms to detect defects, the invention uses a vacuum pump to create negative pressure that causes defective cans to detach from the layer. This substitution of mechanical inspection with pneumatic action dramatically simplifies the device while maintaining effective defect detection.
Solution Approach 2:
The defective empty cans essentially inspect themselves through their structural response to vacuum pressure. The vacuum pressure causes defective cans (which have weaker structures due to dents, bends, or cracks) to deform or detach, while intact cans remain stable. This self-revealing mechanism eliminates the need for external inspection equipment, reducing device complexity while maintaining detection capability.
2Measurement precision
If individual inspection of each empty can is performed, then measurement precision is improved, but productivity decreases due to time consumption
Solution Approach 1:
The patent merges the inspection of multiple empty cans into a single simultaneous operation. Instead of inspecting cans one by one, the vacuum system applies negative pressure to an entire layer of cans at once, causing all defective cans to detach simultaneously. This consolidation of individual inspections into a collective process dramatically increases productivity while maintaining detection accuracy.
Solution Approach 2:
The replacement of mechanical individual inspection with pneumatic vacuum action enables parallel processing of all cans in a layer. The vacuum pump creates a uniform negative pressure field that acts on all cans simultaneously, allowing defect detection for the entire layer to occur in one operation rather than requiring sequential inspection of each can.
3Productivity
If vacuum pressure is applied to separate defective cans, then productivity is improved, but force control precision must be maintained to avoid damaging intact cans
Solution Approach 1:
The patent utilizes the different mechanical properties of defective and intact cans by changing the pressure parameter. Defective cans have reduced structural strength due to dents, bends, or cracks, causing them to deform or detach at lower vacuum pressures. Intact cans maintain their structural integrity at these pressures. By carefully controlling the vacuum pressure to fall within the range that affects defective cans but not intact ones, the system achieves separation with high precision.
Solution Approach 2:
The vacuum pressure treatment exploits the local quality differences between defective and intact cans. Defective cans have compromised structural quality at specific locations (dents, bends, cracks) that cause them to fail under vacuum pressure, while intact cans have uniform structural quality that allows them to withstand the same pressure. This local quality differentiation enables selective separation based on structural integrity.
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
Enables a simple and time-saving identification and removal of defective cans, ensuring only intact cans are processed, thereby preventing defective products and streamlining the production process.
Implementation Method 1
The empty cans are held in place by suction, in particular all empty cans in a layer are sucked in and held in place by applying a negative pressure to the upper openings of the empty cans simultaneously
Implementation Method 2
all empty cans in a layer are sucked in and held in place by applying a negative pressure to the upper openings of the empty cans simultaneously
Implementation Method 3
intact empty cans do not deform, or at least only deform elastically, when a vacuum of the predefined limit is applied
Implementation Method 4
defective empty cans either undergo plastic deformation or collapse, for example, by imploding
Data Source
Figure 1~2
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AI summary
A method and device (1) for handling empty can layers (20) are disclosed. The empty can layers (20) comprise a plurality of regularly arranged empty cans (21) with top openings (22) and side surfaces (23). The empty can layers (20) are provided at a receiving station (2). In the method, all empty cans (21) of an empty can layer (20) are drawn in and held in a vacuum by applying a vacuum to the top openings (22) of the empty cans (21). The vacuum is increased to a limit value at which the pressure forces acting on the side surfaces (23) of the empty cans (21) by intact empty cans (21) are at least sufficiently compensated by their inherent stability that the side surfaces (23) elastically return to their original contour after the vacuum is released or reduced.