Dual Filter Plastic Melt Cleaner with Segmented Screw
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Solution Overview
Problem
Existing plastic material filtration systems in the molten state during recycling struggle to optimize cleanliness and minimize waste, as the rotation speed of screw feeders and scrapers cannot be managed separately, and require multiple screw feeders for each filtering surface.
Innovation Solution
A filtering device with a hollow body containing two side-by-side filters and a central cleaning system, featuring a rotary main body with scraping elements and axially symmetrical channels that ensure balanced impurity collection and evacuation, using a single independent screw feeder for efficient waste management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single screw feeder is used for both filters, then device complexity is reduced and cost is minimized, but it becomes difficult to independently optimize the rotation speed for each filter
Solution Approach 1:
The single screw feeder is segmented into two independent rotating sections: a first section that rotates at a first speed for the first filter, and a second section that rotates at a second speed for the second filter. This segmentation allows independent control of rotation speeds while using a single unified device structure, resolving the contradiction between device simplicity and operational flexibility.
Solution Approach 2:
The screw feeder incorporates variable speed control mechanisms that allow dynamic adjustment of rotation speeds for different sections. The first and second sections can rotate at different speeds independently, enabling adaptive optimization for each filter's specific requirements while maintaining a unified mechanical structure.
2Manufacturing precision
If multiple scrapers are used for each filtering surface, then cleaning effectiveness is improved, but device complexity and maintenance requirements increase
Solution Approach 1:
Multiple scraping functions are merged into a single integrated scraper assembly. The scraper includes a body with multiple scraping elements arranged to clean both the first and second filtering surfaces simultaneously or sequentially, reducing the total number of independent scraper components while maintaining comprehensive cleaning coverage.
Solution Approach 2:
The single scraper assembly is designed with multi-functionality to perform cleaning tasks for both filters. It includes adjustable scraping elements that can engage with different filtering surfaces, allowing one scraper to replace multiple dedicated scrapers while maintaining cleaning effectiveness across all surfaces.
3Productivity
If the screw feeder rotates faster to clear impurities quickly, then productivity increases, but material waste increases due to excessive scraping force
Solution Approach 1:
The screw feeder incorporates variable speed control that allows optimization of rotation speed based on impurity accumulation levels. The system can operate at lower speeds during normal filtration to minimize waste, and increase speed when impurity removal is critical, dynamically balancing productivity with material conservation.
Solution Approach 2:
The system allows change of operational parameters including rotation speed and scraping force intensity. By adjusting these parameters according to actual filtration conditions, the system optimizes the balance between impurity removal efficiency and plastic material waste, preventing excessive scraping that would cause material loss.
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 design enhances the cleanliness of filters, maintains balanced flow rates, and minimizes waste by allowing independent control of rotation speeds and using a single screw feeder for both filters, improving filtration quality and efficiency.
Implementation Method 1
a rotary main body with a first side facing towards the first filter and provided with first scraping elements cooperating with the first filtering surface of the first filter
Implementation Method 2
a first plurality of axially symmetrical channels communicating with the first side and a second plurality of axially symmetrical channels communicating with the second side and suited to receive the impurities collected by the first scraping elements and the second scraping elements
Data Source
AI summary
A filtering device for a plastic material in the molten state includes a hollow body having a mouth and a cover; an inlet way and an outlet way for the filtered plastic material; two filters arranged side by side; a rotary cleaning device arranged between the two filters and provided with scraping elements cooperating with the filtering surfaces; and an evacuation device configured to discharge the impurities toward an evacuation outlet, the evacuation device being arranged centrally in such a way that the impurities travel along equal paths with the same flow rate and discharge the impurities in a balanced manner on the evacuation device.