Buttress Bridges Between Disperser Teeth
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Solution Overview
Problem
Disperser machines used for recycling paper and packaging materials face issues with tooth breakage due to abrasive contaminants, leading to reduced lifespan and throughput, as existing hard-wear alloys are brittle and tall teeth are not effectively supported, affecting the homogeneity and capacity of material processing.
Innovation Solution
The design incorporates bridges between adjacent teeth on the plate segments, providing structural support to maintain tall, narrow teeth made of hard-wearing alloys, optimizing their shape and location for maximum strength and flow capacity while minimizing the risk of breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If hard-wear alloys are used to form plates resistant to wear from abrasive particles, then wear resistance is improved, but the teeth may break when impacted by larger hard particles due to brittleness
Solution Approach 1:
The plate is divided into multiple plate segments that can be independently mounted on the support disc. This segmentation allows individual segments with broken teeth to be replaced without replacing the entire plate, improving reliability while maintaining the use of hard-wear alloys for wear resistance.
Solution Approach 2:
Dams and ramps are pre-formed on the substrate before the teeth are created. These structural features provide preliminary support to the teeth, helping to prevent breakage from impact by hard particles while maintaining the hard-wear alloy composition for wear resistance.
2Reliability
If wide and short teeth are used on hard-wearing alloy plates, then breakage resistance is improved, but the number of intermeshing teeth edges is reduced, lowering energy input capability
Solution Approach 1:
The invention changes the dimensional parameters of the teeth by forming dams and ramps that support taller and narrower teeth. This parameter change increases the number of intermeshing teeth edges for higher energy input while the dam structure compensates for the increased height to maintain breakage resistance.
3Use of energy by moving object
If tall teeth are used to increase intermeshing edges and energy input, then processing capability is improved, but the gap between opposing discs is reduced, lowering throughput capacity
Solution Approach 1:
The invention uses dams and ramps that extend in the axial dimension (perpendicular to the disc faces) to support the tall teeth. This allows the teeth to be tall for increased energy input while the dams provide structural support without occupying radial space that would reduce throughput capacity.
4Reliability
If large dams and ramps are used to support teeth and reduce breakages, then tooth durability is improved, but the homogeneity of fiber material flow is affected and throughput capacity is reduced
Solution Approach 1:
The dams and ramps are positioned locally between specific adjacent teeth rather than spanning the entire plate. This localized approach provides necessary tooth support and durability while minimizing interference with the overall flow of fiber material, maintaining both throughput capacity and homogeneity.
Data Source
AI summary
A plate segment includes: a substrate having a front side and a back side, wherein the back side is configured to be mounted to a support disc of a disperser; and rows of teeth protruding from the front side of the substrate. The rows of teeth are arranged along an arc extending from a first lateral side of the plate segment to an opposite lateral side of the plate segment. A first tooth in the rows of teeth has a first tooth face. A buttress extends from the first tooth face to a face of an adjacent tooth. The buttress has a concave profile at a height above the substrate less than a full height of the teeth.