Rotary Drum Screener With Airflow and Agitation for Strand Filtering

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Solution Overview

Problem

Existing rotary drum screeners struggle with separating differently sized plastic pieces and filtering out strands due to issues such as angel hairs getting caught and static electricity causing blockages, which leads to poor screening performance and system failures.

Innovation Solution

A rotary drum screener with a helical blade and perforated screen, combined with air nozzles to blow air into the drum and feeder, and a secondary helical blade extending into the feeder to agitate plastic pieces, preventing or mitigating blockages caused by static electricity and angel hairs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional rotary drum screeners are used to separate plastic pieces, then screening function is provided, but blockages occur due to static electricity and angel hairs getting caught

Engineering Contradiction:

Improvescreening operation continuityVSAvoidblockages from static electricity and angel hairs

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

Air nozzles are installed to blow air into the rotary drum and feeder, creating pneumatic flow that prevents plastic pieces from sticking together due to static electricity and prevents angel hairs from getting caught on screening surfaces, thereby eliminating blockages while maintaining continuous screening operation

Inventive Principle:

Principle #29Pneumatics and hydraulics

Solution Approach 2:

A vibratory mechanism is incorporated into the rotary drum screener to create mechanical vibrations that prevent angel hairs from adhering to the drum surface and feeder, and prevent plastic pieces from clumping together due to static electricity, thus maintaining reliable continuous operation

Inventive Principle:

Principle #18Mechanical vibration

2Measurement precision

If screening equipment with fine meshes is used to filter out angel hairs, then filtering precision is improved, but angel hairs and plastic pieces get caught on the screen

Engineering Contradiction:

Improvestrand filtering precisionVSAvoidblockages from caught angel hairs

Core Design Contradiction:

Measurement precisionVSObject-generated harmful factors

Solution Approach 1:

The vibratory mechanism creates high-frequency vibrations of the screening surface that prevent angel hairs from adhering to the fine mesh screen, allowing the screen to maintain its filtering precision while avoiding blockages from caught strands

Inventive Principle:

Principle #18Mechanical vibration

Solution Approach 2:

Air nozzles directed at the screening surface create pneumatic disruption that prevents angel hairs from getting caught on the fine mesh, maintaining filtering precision while eliminating blockages

Inventive Principle:

Principle #29Pneumatics and hydraulics

3Ease of operation

If plastic pieces are fed directly into the rotary drum, then feeding is simple, but blockages occur in the feeder due to static electricity

Engineering Contradiction:

Improvefeeding simplicityVSAvoidblockages in feeder from static electricity

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

Air nozzles are installed in the feeder to blow air across the plastic pieces as they are being fed, preventing them from sticking together due to static electricity while maintaining the simplicity of the feeding operation

Inventive Principle:

Principle #29Pneumatics and hydraulics

Solution Approach 2:

The vibratory mechanism extends into the feeder area, creating vibrations that prevent plastic pieces from clumping together due to static electricity, maintaining feeding simplicity while preventing blockages

Inventive Principle:

Principle #18Mechanical vibration

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

Effectively separates differently sized plastic pieces and filters out strands by preventing blockages, ensuring smooth operation and improved screening performance.

Implementation Method 1

at least one air nozzle configured to blow air into the rotary drum to prevent or mitigate blockages in the rotary drum

Methodology Applied

Scientific EffectAir flow:

Implementation Method 2

a second helical blade that extends from the rotary drum into the feeder to prevent or mitigate blockages in the feeder (or between the feeder and the drum) by agitating the plastic pieces as they pass through the feeder

Methodology Applied

Scientific EffectMechanical agitation:

Implementation Method 3

The rotary drum includes a helical blade surrounded by a perforated screen that is transmissive to plastic pieces with a diameter smaller a maximum hole diameter of the screen

Methodology Applied

Scientific EffectPhysical filtration: Filter (physical)

Data Source

PatentUS12453987B1Rotary drum screener for separating differently sized plastic pieces and filtering out strands

Publication Date: 2025.10.28 EBM MFG INC

AI summary

A rotary drum screener includes a feeder and a rotary drum. The feeder is configured to receive plastic pieces and direct the plastic pieces through an opening within a rotary bearing. The rotary drum is connected to the rotary bearing and configured to receive the plastic pieces from the feeder. The rotary drum includes a helical blade surrounded by a perforated screen that is transmissive to plastic pieces with a diameter smaller a maximum hole diameter of the screen. The rotary drum screener further includes means for preventing or mitigating blockages including: at least one air nozzle configured to blow air into the rotary drum; at least one air nozzle configured to blow air into the feeder; and/or a second helical blade that extends from the rotary drum into the feeder to prevent or mitigate blockages by agitating the plastic pieces as they pass through the feeder.