Sludge Scraper Chain Layout for Mid-Travel Direction Reversal
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Solution Overview
Problem
Conventional sludge treatment apparatuses cannot reverse the traveling direction of the scraper in the middle of its movement range, limiting flexibility and maintainability.
Innovation Solution
The sludge treatment apparatus features a driving wheel that reverses direction to allow the scraper to change its movement direction at any point, using an endless chain with engagement portions arranged in a specific configuration to alternately contact with a pulling portion, enabling reversible movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If sludge is dewatered using conventional methods (centrifugal separation, pressure filtration, or centrifugal filtration), then water can be separated from sludge, but the filtrate contains fine sludge particles that require additional treatment and the process is complex and costly
Solution Approach 1:
The invention extracts and removes fine sludge particles from the filtrate using a skimmer device with a suction line that draws particles from the water surface. This separates the fine particles that would otherwise require complex additional treatment, simplifying the overall dewatering process while maintaining high water separation efficiency.
Solution Approach 2:
The invention introduces an intermediary substance (hydrophobic powder or oil) that modifies the surface properties of fine sludge particles, causing them to aggregate and rise to the water surface. This intermediary enables easier separation of fine particles without requiring complex filtration equipment, reducing process complexity while maintaining separation efficiency.
2Speed
If sludge is conditioned with polymer and allowed to settle, then sludge particles aggregate and settle faster, but fine particles remain suspended in the supernatant requiring additional treatment
Solution Approach 1:
The invention converts the harmful effect of fine particles remaining suspended in the supernatant into a beneficial separation process. By using a skimmer to remove fine particles that rise to the surface after polymer conditioning, the system transforms what would be a treatment deficiency into an effective two-stage separation process that achieves both fast settling and fine particle removal.
Solution Approach 2:
The invention applies different treatment mechanisms to different portions of the sludge mixture: polymer conditioning for bulk sludge aggregation and settling, followed by skimming for fine particle removal from the supernatant. This localized application of different separation mechanisms optimizes both settlement speed and fine particle removal efficiency.
3Loss of substance
If sludge is dewatered to high solid content, then less sludge volume requires disposal, but the energy consumption and equipment wear increase significantly
Solution Approach 1:
The invention applies partial dewatering followed by a secondary fine particle removal step rather than attempting extreme dewatering to very high solid contents. The skimmer removes fine particles from the supernatant, achieving effective sludge volume reduction and disposal efficiency without subjecting the system to the high energy consumption and equipment wear associated with aggressive dewatering to maximum solid content.
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
This solution allows for reversible movement of the scraper at any desired position during operation, enhancing maintainability and handling of unexpected situations, and eliminates the need for sensors to detect end positions or alternating wheel rotations.
Implementation Method 1
conditioned with a hydrophobic powder or oil, Fine sludge particles aggregate and settle quickly
Implementation Method 2
a suction line is inserted into the dewatered sludge at a position below the water surface in the container
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A traveling direction of a sludge drawing tool can be reversed regardless of the position of the sludge drawing tool. An endless chain 5 is wound around a pair of wheels 4a and 4b, has straight lines L1 and L2 extending therebetween, and a pulling portion 5a is provided in a part thereof. A sludge drawing tool 2 is arranged to be able to move forward between the wheels 4a and 4b. The sludge drawing tool 2 is provided with engagement portions 7a to 7d having a shape enabling the pulling portion 5a circumferentially moving along the chain 5 to be engaged therewith and disengaged therefrom. When the driving wheel 4a rotates in a forward direction, the engagement portion 7a comes into contact with the pulling portion 5a circumferentially moving along the straight line L1 in a drawing direction, to make the sludge drawing tool 2 move in the drawing direction. During the rotation in the forward direction, the engagement portion 7b comes into contact with the pulling portion 5a circumferentially moving along the straight line L2 in a returning direction, to make the sludge drawing tool 2 move in the returning direction. When the driving wheel 4a rotates in a reverse direction, the engagement portion 7c comes into contact with the pulling portion 5a circumferentially moving along the straight line L1 in the returning direction, to make the sludge drawing tool 2 move in the returning direction. During the rotation in the reverse direction, the engagement portion 7d comes into contact with the pulling portion 5a circumferentially moving along the straight line L2 in the drawing direction, to make the sludge drawing tool 2 move in the drawing direction.