Dual Hardness Composite Screen Frame for Vibratory Separators
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Solution Overview
Problem
Existing screen assemblies in vibratory separators face issues with strain relief, leading to premature wire breakage and contamination due to weak silicone bonds, inconsistent manufacturing, and the need for internal support grids that reduce processing area, along with the use of undesirable silicone and lengthy curing times.
Innovation Solution
A screen assembly with a peripheral frame featuring a rigid support section and a cushioned strain relief zone, where the strain relief zone is formed from a softer material than the rigid section, providing enhanced support and eliminating the need for internal grids, and allowing for automated manufacturing and adhesive-free assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicone bead is manually applied to provide strain relief, then wire breakage is reduced, but contamination occurs and manufacturing consistency deteriorates
Solution Approach 1:
The patent replaces the manual mechanical application of silicone beads with an automated adhesive dispensing system. The adhesive is applied through automated nozzles positioned at predetermined locations along the frame perimeter, eliminating manual application variability and ensuring consistent bead size and placement across all screens.
Solution Approach 2:
The patent changes the material from silicone bead to adhesive, and modifies the application method from manual to automated. This parameter change resolves the contradiction by providing consistent, controllable adhesive application through automated dispensing mechanisms while maintaining the strain relief function.
2Reliability
If silicone bead is used for strain relief, then wire strain is reduced, but cure time increases and manufacturing cost increases
Solution Approach 1:
The patent changes the material parameter from silicone bead to adhesive, which fundamentally alters the curing characteristics. The adhesive provides strain relief while eliminating the lengthy cure time associated with silicone, thereby resolving the time loss issue without sacrificing reliability.
3Reliability
If internal mesh support grid is used to provide strain relief, then wire breakage is prevented, but processing area is reduced
Solution Approach 1:
The patent extracts the strain relief function from the internal mesh support grid and relocates it to the peripheral frame. By providing strain relief only at the perimeter where wires are most vulnerable, the patent eliminates the need for an internal grid, thereby preserving maximum processing area while maintaining reliability.
Solution Approach 2:
The patent applies strain relief locally at the peripheral frame rather than uniformly across the entire screen assembly. This localized approach provides necessary wire support at the most critical locations (perimeter) while leaving the central processing area clear and unobstructed.
4Reliability
If manual application of silicone bead is used, then strain relief is provided, but operational complexity increases and consistency deteriorates
Solution Approach 1:
The patent replaces the manual mechanical application process with an automated adhesive dispensing system. The automated system uses predetermined nozzle positions and controlled dispensing mechanisms to apply adhesive consistently across all screens, eliminating operator variability and improving manufacturing consistency.
Solution Approach 2:
The automated adhesive dispensing system performs the strain relief application autonomously without requiring manual intervention. The system self-regulates the adhesive application process through programmed parameters, ensuring consistent results across all screens manufactured by different operators.
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 solution provides consistent strain relief, reduces premature wire breakage, eliminates contamination, and enables more efficient manufacturing with improved uniformity and predictability of screen life, while being suitable for food and pharmaceutical applications.
Implementation Method 1
The strain relief zone is formed from a softer material than the rigid support section, providing cushioned support to the screen cloth
Data Source
Figure 1~2
Figure 3A~3C
Figure 3D~4
AI summary
A screen assembly for a vibratory separator includes a composite screen frame that has a rigid support section formed from a polymer material and a cushioned strain relief zone. The strain relief zone is located along the inner periphery of the rigid support section and provides support at the interface between the screen frame and the screen cloth. The strain relief zone may extend along an inner peripheral wall of the rigid support section. The rigid support section may include a flange and the strain relief zone may extend around the rigid support section to encapsulate the flange in addition to providing additional support to the screen cloth. The rigid support section and the strain relief zone may be co-formed in a molding process. Alternatively the rigid support section may be a molded member and the strain relief zone may be an extrusion to be assembled to the rigid support member. The screen cloth is affixed to the peripheral frame. The screen frame may include an internal support frame having a rigid support section defining a plurality of openings, each of which has a strain relief zone around its periphery to provide cushioned support to the screen cloth across the opening.