Planetary Roller Extruder Feeder Module Design
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Solution Overview
Problem
Planetary roller extruders face challenges in processing lubricant-incompatible materials due to high resistance and sticking issues, which limits their efficiency in handling various substances like adhesives and fibers, and they struggle with the intake of fine-grained materials, reducing throughput.
Innovation Solution
The design incorporates transport spindles with reduced tooth configuration and a flattened internal toothing to facilitate pressure-free material entry and improved conveying, along with staged tooth configurations to enhance feeding efficiency for fine materials, and the use of guide lengths to prevent material spread.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional planetary roller extruder sections are used as feed parts, then the mixing effect is extremely good, but the conveying effect is much lower and material intake is poor
Solution Approach 1:
The planetary spindle is divided into different functional sections: a feed section with transport screw toothing for material intake and conveying, and a processing section with conventional toothing for mixing. This segmentation allows each section to perform its specific function optimally.
Solution Approach 2:
Different sections of the planetary spindle are equipped with different toothing configurations tailored to their specific functions. The feed section has transport screw toothing for efficient material intake, while the processing section has conventional toothing for mixing, creating local optimization of properties.
2Reliability
If planetary roller extruders process lubricant-incompatible materials, then mixing is achieved, but high resistance and sticking issues occur
Solution Approach 1:
The harmful sticking and resistance effects are eliminated by removing the conventional toothing configuration in the feed section and replacing it with transport screw toothing, which does not cause sticking with lubricant-incompatible materials.
Solution Approach 2:
The toothing configuration parameter is changed from conventional gear-like toothing to transport screw toothing in the feed section, fundamentally altering the material-spindle interaction to prevent sticking and reduce resistance.
3Quantity of substance
If fine-grained materials are processed, then material flow is achieved, but throughput is reduced due to poor intake
Solution Approach 1:
The transport screw toothing acts as an intermediary mechanism between the hopper and the mixing section, effectively conveying fine-grained materials that would otherwise have poor intake and flow characteristics.
Data Source
AI summary
A planetary roller extruder section forms a feed part of an extruder. The planetary roller extruder has an internally toothed housing and an externally toothed central spindle disposed centrally within and at a distance from the housing. Planetary spindles are arranged to rotate in a void between the central spindle and the housing. Each planetary spindle has an external toothing meshing with both the housing and the central spindle. At least one planetary spindle has two axially spaced areas with less than a full set of teeth. Those axially spaced areas include a first area having a first number of teeth and a second area having a second number of teeth. The second number of teeth is less than a full set of teeth and more than the first number of teeth.