Auger Screen Adjustable Compaction Zone Prevents Solids Plugging
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Solution Overview
Problem
Dewatering devices face issues with solids plugging around the drive shaft due to high percentages of stringy solids, such as sanitary wipes, which increase conveying force and block the discharge zone, especially in applications like dewatering screens.
Innovation Solution
An adjustable compaction zone is implemented using a two-piece system where a fixed tube and a slidably mounted telescoping tube with a partition allow for adjustable positioning, enabling the formation or prevention of a solids plug by varying the compaction zone size, ensuring solids either accumulate and compact or pass through without plugging the discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a compaction zone is used to compress solids, then dewatering efficiency is improved, but solids plugging around the drive shaft occurs
Solution Approach 1:
The partition is made movable rather than fixed, allowing it to be positioned at different locations along the auger screen. This enables dynamic adjustment of the compaction zone length to prevent solids plugging while maintaining dewatering efficiency. The partition can be repositioned based on the specific characteristics of the solids being processed.
Solution Approach 2:
The invention changes the parameter of compaction zone length by allowing the partition to be positioned at different locations. By adjusting this parameter, the system optimizes the balance between compaction effectiveness and prevention of solids plugging, resolving the contradiction between dewatering efficiency and discharge reliability.
2Productivity
If the compaction zone length is increased to improve compaction, then dewatering performance improves, but the risk of solids plug formation increases
Solution Approach 1:
The movable partition allows the compaction zone length to be dynamically adjusted. When solids plug formation is detected or anticipated, the partition can be repositioned to shorten the compaction zone, eliminating the harmful effect while preserving the ability to achieve high dewatering performance when conditions allow.
Solution Approach 2:
The compaction zone is segmented into adjustable sections by the partition. This segmentation allows independent control of the compaction zone length, enabling optimization of compaction performance while preventing excessive length that would lead to solids plug formation.
3Ease of manufacture
If a fixed compaction cylinder design is used, then manufacturing is simplified, but adaptability to different solids compositions is reduced
Solution Approach 1:
The partition is designed to be movable and repositionable along the auger screen, providing adaptability to different solids compositions and processing conditions. This maintains relative manufacturing simplicity while significantly improving versatility compared to a completely fixed design.
Solution Approach 2:
The movable partition design makes the compaction cylinder universal, capable of handling different types of solids (e.g., high percentage stringy solids versus other materials) by adjusting the partition position. This single design serves multiple functions and adapts to various processing requirements.
Data Source
AI summary
A dewatering device for removing entrained solids and debris from a liquid stream includes a housing defining a chamber. An auger has a first end positioned outside the chamber and a second end positioned inside the chamber. A compaction zone includes a first tube fixed to the housing. A second tube is slidably mounted on the first tube. A partition is secured to the second tube and has a first longitudinal position in the housing allowing a solids plug to form in the compaction zone and a second longitudinal position in the housing preventing the solids plug from forming in the compaction zone.