Vacuum Disc Separator for Can Manufacturing
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Solution Overview
Problem
The can-making industry faces challenges with the high cost and complexity of cupping presses and associated equipment for forming metal discs into cups, including issues with disc adhesion and the need for extensive coil handling and lubrication systems, leading to frequent machine shutdowns and production losses.
Innovation Solution
A method and apparatus for separating pre-cut, lubricated metal discs using a reciprocating extractor shaft with a vacuum spindle and spring mechanism, which lifts and separates individual discs from a stack by switching vacuum supply on and off to grip and release each disc, assisted by air blow nozzles to enhance separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If pre-lubricated metal discs are stacked for direct supply into a can bodymaker, then equipment costs and footprint are reduced, but the discs adhere to each other causing multiple feeds and production shutdowns
Solution Approach 1:
The system performs preliminary separation of discs from the stack before they reach the cupping press. The separator device pre-cuts discs from the metal sheet and pre-separates them from the stack, so that individual discs are ready for immediate feeding without adhesion issues during the actual cupping process
Solution Approach 2:
A vacuum feed system acts as an intermediary between the stacked discs and the cupping press. The vacuum mechanism grips individual discs and transports them one at a time, preventing adhesion between discs and ensuring reliable single-disc feeding to the press
2Ease of operation
If a vacuum feed system is used to separate discs from a stack, then individual disc extraction is achieved, but the lubricated metal sheets adhere to adjacent sheets preventing sufficient separation
Solution Approach 1:
The system uses a vacuum feed mechanism that applies suction force to grip individual discs. The vacuum pressure overcomes the adhesion force between lubricated discs, allowing the top disc to be separated and transported while leaving other discs in the stack
Solution Approach 2:
The system changes the physical parameters of disc separation by using vacuum pressure instead of mechanical lifting. By controlling the vacuum pressure and application timing, the system overcomes adhesion forces and achieves reliable disc separation without the limitations of mechanical lifting methods
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 reduces equipment costs and minimizes production downtime by efficiently separating and extracting individual discs from a stack, allowing for direct feeding into a cupping press or bodymaker, eliminating the need for expensive coil handling and lubrication systems, and preventing disc adhesion issues.
Implementation Method 1
a vacuum spindle (6) biased towards the stack of discs by a spring (14)
Implementation Method 2
a means of blowing air to create an air cushion under each sheet
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A device (17) for separating discs (10) of metal from a stack of discs held in an infeed (16, 23) to a machine such as a cupping press or other machinery used in can manufacture. In one embodiment a separator ring (17) includes four segments (20) on its inner surface. The segments have a central aperture through which the lowermost disc of the stack is extracted by suction (12), the disc forming a four-leaf clover shape as it is pulled between the four segments.