Vacuum Conveyor Preform Inspection
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Solution Overview
Problem
Existing methods for inspecting preforms in plastic container production are complex, fail to provide a full, unobstructed visual inspection, and require mechanical support that impedes imaging, leading to production downtime and material waste due to inefficient defect detection and sorting.
Innovation Solution
A device utilizing an overhead conveyor with a perforated surface and digital cameras positioned to capture 100% images of preforms from multiple angles, allowing for real-time inspection and sorting without mechanical obstruction, using a vacuum and air jet to detach defective preforms from the conveyor for collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If mechanical means are used to hold preforms during transport, then preforms can be conveyed, but the area covered by these means becomes optically inaccessible
Solution Approach 1:
The patent replaces mechanical holding means with a pneumatic vacuum system. The preform is conveyed and held by vacuum suction through a conveyor belt, eliminating mechanical clamps or fixtures that would block optical access. This allows complete visual inspection of the preform surface while maintaining secure transport.
Solution Approach 2:
The conveyor belt is designed with porous or perforated structure to enable vacuum suction. The porous material allows air flow through the belt surface to create vacuum holding force on the preform, while maintaining optical transparency for complete imaging coverage without mechanical obstruction.
2Measurement precision
If complex testing devices are used to inspect preforms, then defect detection capability improves, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts and eliminates unnecessary mechanical components from traditional inspection devices. By using vacuum conveyance instead of mechanical holding, the system removes clamps, fixtures, and complex positioning mechanisms, simplifying the overall device structure while maintaining inspection accuracy through optical imaging.
Solution Approach 2:
The vacuum conveyor belt serves multiple functions: it conveys the preform, holds it in position during inspection, and enables complete optical access. This multi-functional design replaces multiple separate components, reducing device complexity while maintaining measurement precision.
3Measurement precision
If traditional inspection methods are used, then some defects can be detected, but the entire preform surface cannot be imaged
Solution Approach 1:
By replacing mechanical holding systems with vacuum conveyance, the patent enables unobstructed optical access to the entire preform surface. The vacuum system holds the preform without physical contact points that would block imaging, allowing 100% surface area inspection including all sides and features.
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 complete imaging and efficient sorting of preforms in transit, reducing production downtime and material waste by ensuring all defects are detected and removed without mechanical interference, while being cost-effective and easy to manufacture and operate.
Implementation Method 1
a vacuum conveyor (32) for holding and conveying the preform (30) through the imaging area
Implementation Method 2
a device (20) for breaking the vacuum bond in order to detach the preform (30) from the vacuum conveyor (32)
Data Source
Figure 1~2
AI summary
The method involves gripping individual pre-form (30) successively and conveying it upward. The pre-forms are successively delivered to a perforated overhead vacuum belt, which is impinged with vacuum on rear side. An image of each pre-form is obtained such that an image of complete pre-form is obtained. An electronic data set of the image is generated and processed by electronic data processing such that defective pre-form (38) is detected. An independent claim is included for a device for executing the method for checking and sorting out plastic pre-forms.