Filtrate Barrier Device for Pulp Drum Rewetting Prevention
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Solution Overview
Problem
Existing pulp processing equipment, such as roll presses and drum washers, face the challenge of rewetting, where filtrate flows back through the pulp, diluting it, and existing solutions for preventing rewetting often complicate the cleaning of filtrate channels due to friction and installation difficulties.
Innovation Solution
A device with a biasing member that connects a filtrate barrier to a support element, allowing the barrier to be easily inserted and removed from filtrate channels by adjusting its transverse extension, preventing rewetting without hindering channel cleaning, and featuring pivotable biasing members and locking mechanisms for secure positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If baffle plates are anchored inside the filtrate channel to prevent rewetting, then rewetting prevention is improved, but cleaning of the filtrate channel becomes difficult
Solution Approach 1:
The baffle plate is divided into a stationary part fixed to the drum and a movable part that can be independently removed. This segmentation allows the movable part to be extracted for cleaning while the stationary part remains in place, resolving the contradiction between maintaining rewetting prevention and enabling channel cleaning.
Solution Approach 2:
The baffle plate transitions from a static anchored structure to a dynamic structure with movable parts. The movable portion can be shifted or removed when cleaning is needed, while returning to its blocking position during operation, thus maintaining both rewetting prevention and cleaning accessibility.
2Reliability
If baffle plates are inserted into axial grooves to prevent rewetting, then rewetting prevention is improved, but insertion and removal becomes difficult due to friction
Solution Approach 1:
The movable part of the baffle plate is designed to be completely extractable from the groove rather than requiring forceful insertion/removal. It can be taken out entirely when needed for maintenance, eliminating the friction problem associated with repeated insertion and removal operations.
Solution Approach 2:
Instead of requiring the entire baffle plate to be inserted into the groove for functionality, only the necessary portion needs to engage with the groove for operation, while the rest can be easily manipulated for insertion and removal, reducing friction-related difficulties.
3Ease of operation
If the transverse extension of the device is maintained for easy installation, then ease of installation is improved, but the device cannot be easily removed from filtrate channels with limited entries
Solution Approach 1:
The device incorporates movable parts that allow it to change its transverse extension dynamically. During installation, the device can be in an extended state for ease of handling, and during removal, it can be collapsed to a reduced state to pass through limited channel entries, thus resolving the contradiction between installation ease and adaptability.
Solution Approach 2:
The movable parts of the device can be nested or collapsed into a compact configuration for removal through limited entries, while maintaining their full extended functionality during installation and operation, similar to the nested doll principle where smaller elements fit within larger ones.
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 device effectively prevents rewetting while allowing easy installation and removal, maintaining channel cleanliness and functionality, even in channels with limited entries, by reducing friction and facilitating maintenance.
Implementation Method 1
a biasing member (308, 310, 312) connects the filtrate barrier (304) to the at least one support element (306), the biasing member (308, 310, 312) being adapted to bias the filtrate barrier (304) away from the support element (306) to an unbiased position
Implementation Method 2
The static pressure causes the contaminated liquid, called filtrate, to pass through the outer surface permeable to liquid
Data Source
Figure 1~2
Figure 3A~4B
Figure 5A~6
AI summary
A device (302) for preventing the rewetting of pulp in an apparatus for processing pulp, the apparatus comprising at least one rotatable drum (202, 204) provided with a permeable outer surface (208, 208) and a plurality of axial filtrate channels (210, 212) provided Inwardly of the outer surface (206, 208). The apparatus processes the pulp by at least removing liquid from the pulp and transporting the liquid from the pulp to the filtrate channels (210, 212) through the outer surface (208, 208). The device (302) is adapted to be installed in one of the plurality of filtrate channels (210, 212), and comprises an axially extending filtrate barrier (304) for preventing the flow of liquid from the trailing part of the filtrate channel (210, 212) to the outer surface (206, 208) of the drum (202, 204), and at least one axialiy extending support element (306) connected to the filtrate barrier (304). At least one biasing member (308, 310, 312) is adapted to bias the filtrate barrier (304) away from the support element (306) to a first unbiased position, in relation to the support element (306), at which an extended transverse extension of the device (302) is provided, and adapted to bias the filtrate barrier (304) away from the support element (306) to at least one second unbiased position, in relation to the support element (306), at which a reduced transverse extension of the device (302) is provided. An apparatus for processing pulp comprising said device (302).