Screening Machine with Interlocking Rigid Disks for Biomass
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Solution Overview
Problem
Existing screening technologies face challenges in efficiently screening fine and ultrafine biomass components due to caking issues and high energy requirements, particularly with metal screen disks that require extensive scraper mechanisms for cohesive materials.
Innovation Solution
A screening device with rotatable screen shafts featuring screen disks made of rigid materials, where every second disk is equipped with an extended cleaning tooth to clear caking and reduce energy consumption, allowing for precise screening of fine fractions and preventing blocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If metal screen disks are used for screening fine biomass fractions, then screening precision is improved, but caking of cohesive materials on disks and shaft hubs increases
Solution Approach 1:
The patent introduces an intermediary cleaning mechanism (brushes or scrapers) that acts between the screen disks and the cohesive material to prevent caking. This intermediary element removes accumulated material before it can cause blocking, allowing the metal screen disks to maintain their precision while avoiding the harmful caking effect.
Solution Approach 2:
The cleaning devices are designed to automatically clean the screen disks during rotation without external intervention. The self-cleaning mechanism ensures that the screening precision is maintained continuously by preventing caking through automatic removal of cohesive materials during the screening process.
2Object-generated harmful factors
If extensive scraper mechanisms are provided to clear caking, then caking is reduced, but energy requirement increases
Solution Approach 1:
Instead of providing scrapers at every position, the patent applies cleaning mechanisms only to specific screen disks or at selective locations where caking is most problematic. This partial application of cleaning action reduces the total number of scrapers and their associated energy consumption while still effectively preventing caking at critical points.
Solution Approach 2:
The cleaning mechanism operates periodically during the rotation of screen disks rather than continuously opposing material flow. This periodic cleaning action is sufficient to prevent caking accumulation while consuming significantly less energy compared to continuous scraper mechanisms that must constantly pass through the screened mass.
3Manufacturing precision
If screen disks are made of rigid materials, then screening of fine fractions is enabled, but caking on disks and shaft hubs is increased
Solution Approach 1:
The patent introduces cleaning intermediaries (brushes or scrapers) that work in conjunction with the rigid screen disks. These intermediaries prevent the caking that naturally occurs with rigid surfaces by continuously removing cohesive materials, thereby allowing the rigid disks to maintain their fine screening capability without suffering from the caking problem.
Solution Approach 2:
The patent modifies the operational parameters of the rigid screen disks by introducing rotational movement and associated cleaning actions. This changes the interaction between the rigid surface and cohesive material, preventing static caking while maintaining the rigid disk's ability to screen fine fractions effectively.
4Object-generated harmful factors
If multiple scrapers per disk are provided, then caking is cleared more effectively, but device complexity increases
Solution Approach 1:
The patent applies the principle of partial action by providing cleaning mechanisms only on selected screen disks rather than on all disks. This selective approach effectively clears caking at critical locations while avoiding the complexity of equipping every disk with multiple scrapers, thus reducing overall device complexity.
Solution Approach 2:
The cleaning devices are designed to perform multiple functions: they clean the screen disk surface, prevent caking formation, and can also assist in material conveyance. This multi-functionality reduces the need for separate dedicated scrapers, thereby simplifying the overall device structure while maintaining effective caking prevention.
Data Source
AI summary
A screening machine is provided with a screening device and a screening device with multiple adjacent screen shafts disposed rotatable each of which being provided with a plurality of screen disks. The screen disks are made of rigid materials and are separated from one another in the axial direction by a clearance each. The screen disks of a screen shaft engage in clearances of the screen disks of adjacent screen shafts. Half of the screen disks are provided with a cleaning device for cleaning the clearances between the screen disks.