Modular Screw Conveyor Wear Management
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Solution Overview
Problem
Screw conveyors in pressing screw devices for drying materials, such as moist or wet waste, face high wear due to contamination, leading to costly and labor-intensive maintenance processes, including welding and partial or complete replacement of the spiral screw.
Innovation Solution
The screw conveyor is designed with a modular structure, featuring a basic element and a cover element that can be exchanged, where the cover element absorbs wear, allowing for faster and less expensive maintenance by replacing only the worn parts, eliminating the need for complex welding and balancing procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the spiral screw is directly welded on the shaft, then the spiral screw is securely fixed, but the maintenance process becomes complex and time-consuming when wear occurs
Solution Approach 1:
The spiral screw is divided into two separate elements: a basic element that remains permanently attached to the shaft, and a cover element that can be easily removed and replaced. This segmentation allows the wear-prone cover element to be exchanged without affecting the securely fixed basic element, thus maintaining strong fixation while simplifying maintenance.
Solution Approach 2:
The wear-prone functional surface is extracted from the permanent basic element and transferred to a separate, replaceable cover element. This allows the cover element to be removed and replaced independently when worn, eliminating the need to remove or repair the permanently fixed basic element on the shaft.
2Reliability
If the entire spiral screw is replaced when worn, then complete functionality is restored, but the cost and time of maintenance increase significantly
Solution Approach 1:
By segmenting the spiral screw into a permanent basic element and a replaceable cover element, only the worn cover element needs to be replaced rather than the entire spiral screw. This maintains functional integrity while dramatically reducing maintenance time and cost.
Solution Approach 2:
Instead of replacing the entire spiral screw (excessive action), only the worn cover element is replaced (partial action). This partial replacement is sufficient to restore functionality while avoiding the unnecessary work of removing and reinstalling the entire spiral screw assembly.
3Strength
If hard-facings are executed on the worn spiral screw, then wear resistance is improved, but the mechanical effort and post-finishing requirements increase
Solution Approach 1:
Instead of applying expensive hard-facings to extend the life of the spiral screw, the invention uses a relatively inexpensive, wear-prone cover element that is designed to be replaced rather than repaired. This eliminates the need for complex hard-facing processes and subsequent post-finishing work.
Solution Approach 2:
The worn cover element is discarded and replaced with a new one, rather than attempting to restore it through hard-facing or other repair processes. The basic element is recovered and retained on the shaft, while only the worn cover portion is replaced.
Data Source
AI summary
A screw conveyor, in particular as screw conveyor in a pressing screw device for material to be dried, for example moist or wet waste, consists of a shaft that can be supported on bearings rotatably in the pressing screw device, and at least one spiral screw provided on the shaft to convey the material to be dried in the pressing screw. The spiral screw is formed of at least two elements, such as, for example, a basic element and at least one cover element, and at least one of the elements of the spiral screw is designed exchangeably and removably, respectively.