Ceramic Dewatering Blade Segment Attachment Mechanism
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Solution Overview
Problem
Current methods for attaching ceramic segments to dewatering blades in papermaking machines lead to stress cracks, costly manufacturing, and unsatisfactory joins, with potential for segments to become loose during operation, causing damage.
Innovation Solution
Bonding secondary interlock members to the segments' machine side surfaces, which are then secured within channels in the base member using adhesives or locking mechanisms, allowing for precise alignment and reduced stress on the ceramic material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional dovetail or T-bar attachment methods are used to secure ceramic segments to the base member, then the segments can be mechanically interlocked and replaced, but stress cracks develop in the ceramic material and the joins become unsatisfactory
Solution Approach 1:
The patent introduces an intermediary bonding agent (adhesive or epoxy) between the ceramic segment and the base member to distribute stresses and prevent direct mechanical stress concentration at the interface. This mediator layer eliminates the stress cracking problems associated with rigid dovetail or T-bar attachments while maintaining secure attachment.
Solution Approach 2:
The patent changes the attachment method from rigid mechanical interlocking to a more compliant chemical bonding approach. By using bonding agents with appropriate viscoelastic properties, the system can accommodate thermal expansion and operational stresses without cracking the ceramic segments.
2Manufacturing precision
If ceramic segments are precisely shaped with dovetail or T-bar profiles for mechanical attachment, then accurate positioning is achieved, but manufacturing complexity and cost increase substantially
Solution Approach 1:
The patent extracts the complex dovetail or T-bar profiling from the ceramic segments themselves and relocates the attachment geometry to the base member. The ceramic segments can then be manufactured as simple flat or slightly contoured pieces, while the base member incorporates the positioning features, thereby simplifying ceramic manufacturing without sacrificing positioning accuracy.
Solution Approach 2:
Instead of shaping the ceramic segment with complex attachment profiles, the patent inverts the approach by providing the attachment geometry on the base member. The ceramic segment simply bonds to this pre-formed geometry, reversing which component carries the manufacturing complexity.
3Reliability
If segments are securely attached to prevent loosening during operation, then reliability improves, but the ability to replace or reposition segments decreases
Solution Approach 1:
The patent creates a semi-permanent attachment that balances retention and replaceability. The bonding agent provides sufficient strength to prevent loosening during operation, yet allows for controlled removal and repositioning when needed, offering a dynamic solution between permanent and temporary attachment.
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 method provides a reliable, cost-effective attachment that minimizes stress cracking and ensures segments remain securely attached, reducing the risk of damage to the machine and fabric, while allowing for versatile segment configurations and precise alignment.
Implementation Method 1
at least one interlock means bonded by an adhesive to the lower surface of the segment
Data Source
AI summary
Segments, typically ceramic, for use in dewatering blades for papermaking and similar machines comprise lower surfaces to each of which at least one interlock member is bonded. The segments are installed by inserting the interlock members into a channel in an intermediate sub-assembly or base member. The members are securely attached within the channel by a suitable adhesive, or clip means to engage the interlock members, with the optional addition of an adhesive. The segments and dewatering blades, and a method of manufacture, allows for the segments to be made as flat units, without unnecessary angular surfaces, simplifies their attachment to the base, and reduces the occurrence of stress cracking or other damage to the segments. A single segment can be used in various dewatering blade types and in more than one orientation in dewatering blades, reducing manufacturing costs by unitizing construction.