Removable Drum Mill Lifting Wall Segments
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Solution Overview
Problem
Current lifting wall arrangements in drum mills are cumbersome and time-consuming to install and remove due to complex constructions and heavy fasteners, requiring significant manual effort and time.
Innovation Solution
A lifting wall arrangement comprising removably installable segments with integrated inner and outer walls, featuring reduced fasteners and no long bolts, allowing for preassembly into one-piece units that can be easily attached from the outside, facilitating automated installation and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate components (inner wall and outer wall) are attached using long bolts, then the lifting wall arrangement achieves structural integrity, but the installation and removal process becomes cumbersome and time-consuming
Solution Approach 1:
The lifting wall arrangement is divided into multiple segments that can be independently installed and removed. Each segment comprises an inner wall portion and an outer wall portion that are pre-assembled together, allowing the entire lifting wall to be installed by attaching segments rather than assembling multiple separate components during maintenance operations
Solution Approach 2:
The inner wall and outer wall are pre-assembled into integrated segments before installation on the drum mill. This preliminary assembly of components eliminates the need for time-consuming on-site fastening operations, as segments can be quickly attached as complete units
2Strength
If long bolts are used to attach inner wall to outer wall, then secure connection is achieved, but the fasteners become heavy and awkward to handle
Solution Approach 1:
The connection system is segmented into modular units where the inner wall and outer wall are pre-connected during manufacturing. This eliminates the need for operators to handle and install long, heavy bolts during maintenance, as segments arrive pre-assembled and can be quickly attached using simpler fastening mechanisms
Solution Approach 2:
The patent introduces simplified fastening mechanisms that act as intermediaries between segments and the drum mill structure. These intermediary fastening systems replace the need for long bolts, providing secure connection while being much easier to handle and install
3Adaptability or versatility
If multiple separate components are used in the lifting wall arrangement, then functional requirements are met, but the overall weight of the arrangement increases
Solution Approach 1:
The inner wall and outer wall are merged into integrated segments that combine multiple functions in single components. This merging eliminates the need for separate fastening components and reduces the total weight of the lifting wall arrangement while maintaining all necessary functional capabilities for pulp lifting and discharge
Data Source
Figure 1
Figure 2
Figure 3a~3f
AI summary
The invention relates to a lifting wall arrangement (8) at an end wall (2) of a drum mill, having a plurality of segments (10) which are removably installable on the end wall, wherein each segment comprises an inner wall (10: 1) and an opposing outer wall (10:2), wherein at least one lifting blade (11) is arranged on said outer wall, such that the outer wall, the lifting blade and the inner wall define a discharge channel (12) leading to a discharge cone (9), and wherein said inner wall forms a part of a sieving wall (13) in the drum mill. Each segment constitutes an integrated unit adapted to be installed on the end wall. The invention also relates to a segment of a lifting wall arrangement and a drum mill comprising a lifting wall arrangement.