Rotating Waste Drum With Offset Paddles for Fibrous MSW Separation
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Solution Overview
Problem
Existing waste processing systems struggle to efficiently separate and process increasing amounts of fibrous materials like paper and cardboard from municipal solid waste (MSW) without relying on steam or vacuum, and face challenges in managing complex waste streams due to decreasing landfill space and increasing online shopping-related packaging waste.
Innovation Solution
A rotatable drum system with paddles and lifters agitates and hydrates MSW, using angularly offset paddles and eccentric openings to facilitate retention and egress control, combined with a drive system and trunnion assemblies for adjustable rotation and tilt, allowing for efficient separation of recyclable and organic fractions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If steam or vacuum is used to process MSW, then waste treatment effectiveness is improved, but system complexity and energy consumption increase
Solution Approach 1:
The patent extracts and removes the steam and vacuum systems from the waste processing apparatus, replacing them with a simpler mechanical drum system that uses gravity and rotation to achieve waste processing and separation without requiring complex thermal or pressure control systems
Solution Approach 2:
The patent replaces the thermal (steam) and pneumatic (vacuum) processing systems with a mechanical drum rotation system that uses gravitational force and mechanical agitation to achieve waste treatment, thereby eliminating the need for complex steam generation and vacuum maintenance infrastructure
2Productivity
If traditional separation systems are used, then recyclable material recovery is achieved, but fibrous materials like paper and cardboard are not efficiently processed
Solution Approach 1:
The patent employs a rotating drum with adjustable tilt angles and variable rotation speeds that can dynamically adapt to different waste stream compositions, particularly optimizing the processing of fibrous materials like paper and cardboard through controlled mechanical agitation and gravity-assisted separation
Solution Approach 2:
The patent changes key operational parameters including drum tilt angle, rotation speed, and internal component configuration to optimize the processing of fibrous materials, allowing the system to adapt to varying waste compositions and improve recovery efficiency for challenging materials like cardboard and paper
3Productivity
If drum rotation speed is increased, then processing throughput is improved, but material separation precision deteriorates
Solution Approach 1:
The patent uses a variable speed drive system that allows the drum rotation speed to be dynamically adjusted based on the specific separation requirements, enabling operators to optimize both throughput and separation precision for different waste stream compositions and material types
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
The system effectively processes fibrous waste into smaller pieces, hydrates organics for easier separation, and reduces waste volume by converting MSW into recyclable streams, suitable for industrial-scale operations and diverse waste types.
Implementation Method 1
A plurality of paddles may be joined to an internal surface of the drum and arranged angularly offset from the longitudinal axis. In operation, the mixture of MSW and water may be received at the ingress during rotation of the drum such that the angularly offset plurality of paddles agitate and urge the received mixture towards the ingress
Implementation Method 2
the mixture of MSW and water may be received at the ingress during rotation of the drum such that the angularly offset plurality of paddles agitate and urge the received mixture towards the ingress to thereby facilitate retention of the mixture of in the drum
Data Source
AI summary
A rotatable drum system includes a frame and a drum rotationally supported thereon. Paddles in an interior of the drum are angularly offset from the longitudinal axis. An eccentric opening offset from the longitudinal axis forms the egress. Mixed solid waste agitated by the paddles while in the drum. Trunnions may support the drum. An actuator may be pivotable with an upper frame relative to a lower frame and the actuator can cause drum rotation irrespective of a position of the upper frame relative to the lower frame. A trunnion assembly with a rocker pivotally coupled to a base thereof via a first axle, enables the rocker to be pivotable relative to the base about the first axle. A second axle may be rotationally coupled to the rocker. A roller may be rotationally coupled to the rocker via the second axle, and configured to support a rotating load.