Balling Machine Scraper Ridges for Fertiliser Pellet Production
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Solution Overview
Problem
Existing balling machines are inefficient for forming fertiliser pellets, particularly those made of fine particles, due to the need for water-soluble binders and strict size control, leading to slow production rates and limited yield.
Innovation Solution
A balling machine with a rotatable tube coated by a cementitious material forming circumferential ridges, combined with a scraper having toothed and non-toothed regions, enhances material friction and compaction, allowing for more efficient pellet formation and size control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a traditional disc pelletiser is used to form fertiliser pellets, then the pellets can be produced with controlled size, but the production rate is slow and daily yield is limited
Solution Approach 1:
The patent replaces the traditional disc pelletiser mechanical system with a balling machine that uses a rotating tube and scraper system. The scraper with specific geometric features (angle of repose, spacing) creates controlled material build-up and circumferential ridges that enable pellet formation through rotational motion and gravity, achieving both size control and higher productivity
Solution Approach 2:
The patent changes key operational parameters by controlling the rotational speed of the tube, the spacing and angle of the scraper teeth, and the moisture content of the material. These parameter adjustments enable the balling machine to form pellets of controlled size (2-4mm) while operating at higher speeds than disc pelletisers, thus improving both manufacturing precision and productivity
2Productivity
If the scraper allows material to build-up into circumferential ridges on the inside surface of the rotatable tube, then material friction and contact area increase improving balling efficiency, but the scraper design becomes more complex
Solution Approach 1:
The scraper is segmented into multiple teeth with specific geometric features (spacing, angle of repose) rather than a single continuous blade. This segmentation allows material to build-up in controlled circumferential ridges between the teeth, increasing friction and contact area for improved balling efficiency while maintaining a relatively simple overall scraper structure
Solution Approach 2:
The scraper teeth are designed with specific local geometric properties (angle of repose, spacing, height) that vary along the scraper length. This local quality optimization enables controlled material build-up patterns that enhance balling efficiency in specific zones without requiring complex overall scraper design
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 significantly increases the rate of fertiliser pellet production by improving material friction and compaction within the balling machine, resulting in more efficient and controlled pellet formation, especially for fine particle materials like fertilisers.
Implementation Method 1
The coating material has been scraped by the scraper so as to form a layer of coating material comprising a plurality of circumferential ridges on the inside surface of the rotatable tube
Data Source
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AI summary
A method of processing a material using a balling machine (100). The balling machine comprises: a rotatable tube (102) arranged to receive a material therein and to rotate so as to cause the material to form balls; and a scraper (138) arranged to control the build-up of the material on an inside surface of the rotatable tube. The scraper comprises a scraping edge having a plurality of teeth (146) and a plurality of recesses (148) between the teeth. The arrangement of the teeth and the recesses permit the material to build-up into a plurality of circumferential ridges (154) on the inside surface of the rotatable tube. The inside surface of the rotatable tube has been coated with a coating material (152) which has been scraped by the scraper so as to form a layer of coating material comprising a plurality of circumferential ridges on the inside surface of the rotatable tube. The method comprises the steps of: balling a process material, which is different from the coating material, by providing the process material into the rotatable tube which has been coated with the coating material, and rotating the rotatable tube so as to form balls of the process material.