Screw Press Shaft Composite Coating for Material Adherence
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Solution Overview
Problem
Screw presses face issues with severe abrasion and material adherence on the screw shaft, leading to reduced efficiency and potential clogging, particularly with materials like chemical pulp fibers, due to the smooth surface resulting from abrasion, which is costly and time-consuming to address with traditional surface-coated steel plates.
Innovation Solution
A composite material with evenly distributed hard material particles embedded in a matrix component is secured to the screw shaft, providing a defined surface roughness and friction coefficient, which can be quickly and inexpensively replaced using an adhesive connection, allowing for improved handling and wear indication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the screw shaft surface is polished smooth after abrasion, then the surface becomes smooth, but material adherence increases and efficiency decreases
Solution Approach 1:
The surface roughness of the screw shaft is made dynamically adjustable through the adjustable roughening element, allowing the operator to optimize the balance between abrasion resistance and material adherence prevention based on operational requirements and material characteristics
Solution Approach 2:
The invention changes the surface parameter (roughness) of the screw shaft by introducing an adjustable roughening element that can modify the surface characteristics to prevent material adherence while maintaining abrasion resistance
2Productivity
If coated steel plates with defined surface roughness are welded onto the screw shaft, then material adherence is reduced, but manufacturing cost and time increase
Solution Approach 1:
The roughening element is designed as a replaceable, cost-effective component that can be easily manufactured and installed, serving as an economical alternative to expensive welded steel plates while maintaining the necessary surface roughness to prevent material adherence
Solution Approach 2:
The invention changes the surface parameter (roughness) of the screw shaft by introducing an adjustable roughening element that can modify the surface characteristics to prevent material adherence while maintaining abrasion resistance
3Productivity
If welded steel plates are used to maintain surface roughness, then material adherence is prevented, but shutdown time for replacement increases
Solution Approach 1:
The surface roughness of the screw shaft is made dynamically adjustable through the adjustable roughening element, allowing the operator to optimize the balance between abrasion resistance and material adherence prevention based on operational requirements and material characteristics
Solution Approach 2:
The roughening element is designed as a replaceable, cost-effective component that can be easily manufactured and installed, serving as an economical alternative to expensive welded steel plates while maintaining the necessary surface roughness to prevent material adherence
4Strength
If the screw shaft surface becomes smooth due to abrasion, then abrasion resistance is maintained, but conveying material adheres to the surface
Solution Approach 1:
The invention applies a localized roughening element only to the specific area of the screw shaft where material adherence occurs, maintaining the smooth surface elsewhere while providing targeted roughness to prevent sticking without compromising overall abrasion resistance
Solution Approach 2:
The invention changes the surface parameter (roughness) of the screw shaft by introducing an adjustable roughening element that can modify the surface characteristics to prevent material adherence while maintaining abrasion resistance
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 composite material solution enhances screw press efficiency by preventing material adherence, reducing wear, and allowing for faster and cheaper surface changes, maintaining consistent performance over the lifespan of the material.
Implementation Method 1
The underside of the composite material is glued detachably to the screw shaft by an adhesive layer
Implementation Method 2
the friction generated by the mass rotating together with the screw and the stationary cylindrical housing shell—this is referred to in this context as friction conveying
Data Source
AI summary
A screw press for separating off liquid from an article, comprising a screw shaft together with a conveying helix, which is arranged helically on the screw shaft, and a housing enclosure, which surrounds the conveying helix, wherein a transporting passage for the article which is to be conveyed is formed between the screw shaft, the conveying helix and the housing enclosure, wherein a composite comprising hard-material particles which are embedded in a matrix component to form surface roughness is fastened with material bonding to at least one surface portion of the screw shaft, within the transporting passage. A use of a composite comprising hard-material particles which are embedded in a uniformly distributed manner in a matrix component to form surface roughness, for the purpose of providing fastening with material bonding to at least one surface portion of a screw shaft.