Tapered Auger Cone Design for Waste Compactor Jamming
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Solution Overview
Problem
Existing waste compaction devices, particularly screw compactors, face issues with jamming due to plastic materials, leakage with wet waste, and mechanical complexity, including strain on bearings and need for frequent maintenance.
Innovation Solution
A waste material compaction device featuring a sealed design with a tapering auger cone and flight, an integrated motor and gearbox within the auger cone, and strategically positioned bearings to reduce load and prevent binding, allowing for efficient compaction of wet and stringy waste without jamming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a screw compactor with parallel shaft and parallel auger flight is used, then waste material can be pushed in a particular direction, but the machine gets bound up with plastic material and jams
Solution Approach 1:
The patent applies asymmetry by using a tapered auger cone with a helical flight where the flight angle varies along the length of the cone. The flight is closer to the central core at one end and farther at the other end, creating an asymmetric geometry that prevents plastic materials from binding and jamming while maintaining effective waste material pushing capability.
2Length of moving object
If the central core of the auger has a long overhang beyond the bearings, then the auger can reach the full length of the container, but this puts very large strain on the bearings and impacts their life
Solution Approach 1:
The patent resolves the bearing load issue by transitioning from a straight cylindrical auger to a tapered conical auger geometry. This dimensional change in the auger shape allows the flight to be positioned optimally along the tapered surface, reducing the mechanical leverage and strain on bearings while maintaining full container reach.
3Ease of operation
If a complex arrangement of driving mechanisms with motor and gearbox placed outside the auger is used, then the auger can be driven, but the mechanisms are subject to wear and need constant maintenance
Solution Approach 1:
The patent merges the motor and gearbox into a single integrated drive unit that is positioned inside the auger cone structure. This consolidation eliminates the need for external sprockets and chains, reducing mechanical complexity and maintenance requirements while providing reliable auger rotation.
4Productivity
If existing screw compactors are used, then waste material can be compacted, but they are prone to leakage from wet waste material
Solution Approach 1:
The patent employs a sealed hopper and receiver configuration with a tapered auger design that prevents wet waste material from bypassing the compaction zone. The sealed structure and tapered geometry work together to contain and direct wet materials effectively, preventing leakage.
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 solution provides a maintenance-free, efficient compaction of waste materials, including wet and stringy items, with reduced strain on components, preventing jamming and leakage, and ensuring continuous operation without external mechanical wear.
Implementation Method 1
an auger flight arranged on an outer surface of the auger cone... such that waste material placed in the container is compacted and pushed in a predetermined direction
Implementation Method 2
a first bearing means located adjacent to a connection of a base skirt of the auger cone and a second bearing means positioned significantly inside the auger cone
Data Source
AI summary
A waste material compaction device includes an auger cone having a base skirt; a hopper for containing said auger cone; a support located inside the auger cone and fitted to the hopper; an auger flight arranged on an outer surface of the auger cone; a first bearing located adjacent the base skirt of the auger cone; a second bearing positioned inside the auger cone at a distance from the first bearing; and an electric motor and a gearbox for driving the auger cone and the auger flight such that waste material placed in the hopper is compacted in a predetermined direction; the first and second bearings bearing a working load of the waste material compaction device.