Elastic Filter Screen Clamping Mechanism for Plastic Melt
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Solution Overview
Problem
Existing devices for filtering plastic melts lack reliability and ease of maintenance, particularly in ensuring that filter screens are easily replaceable and do not suffer from buckling or wrinkling during attachment.
Innovation Solution
A device with a housing containing a cylindrical filter cavity and a filter piston, where the filter surface is enclosed by a flexible, elastic filter screen that clamps onto the filter base body without additional fastening elements, ensuring a self-clamping mechanism that is both rigid and flexible, reducing dead spaces and allowing for easy replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter screen is attached using additional fastening elements, then the attachment is secure, but the replacement process becomes complex and time-consuming
Solution Approach 1:
The filter screen is designed to attach and detach through its own elastic deformation properties without requiring external fastening elements. The elastic material itself provides the clamping force through its inherent elasticity, allowing operators to simply snap the filter screen into place and remove it by reversing the deformation, significantly simplifying replacement procedures while maintaining secure attachment
Solution Approach 2:
The filter screen utilizes an elastic membrane structure that can deform flexibly to engage with the filter cavity geometry. This flexible shell design allows the filter screen to conform to the cavity shape and maintain secure attachment through elastic recovery forces, while the simplicity of the single-piece elastic structure enables easy removal and replacement without additional fasteners
2Device complexity
If the filter screen material is made flexible and elastic for easy attachment, then the clamping mechanism is simplified, but the material may buckle or wrinkle during attachment
Solution Approach 1:
The filter cavity is designed with a curved, dome-shaped geometry that matches the natural curvature of the elastic filter screen material. This curvature compatibility allows the flexible screen to conform to the cavity shape without creating stress concentrations that would cause buckling or wrinkling, while still maintaining the simplicity of the elastic clamping mechanism
Solution Approach 2:
The elastic modulus and thickness of the filter screen material are specifically optimized to provide sufficient rigidity to resist buckling and wrinkling during attachment, while maintaining enough flexibility to allow easy snapping into place. The material parameters are tuned to achieve the right balance between structural stability and installation ease
3Ease of repair
If the filter piston is designed to be axially displaceable for maintenance access, then the filter screen can be replaced, but leakage paths may open between the piston and cavity wall
Solution Approach 1:
The filter screen is designed as a separate, removable component that can be independently extracted from the filter cavity without moving the filter piston axially. This separation allows maintenance personnel to access and replace the filter screen through the stationary cavity opening, maintaining sealing integrity during operation while enabling easy replacement during maintenance without compromising the piston's sealing function
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 a reliable and efficient filtering process with reduced risk of leakage and simplified maintenance, as the flexible, elastic filter screen can be easily removed and replaced without compromising the structural integrity or flow characteristics.
Implementation Method 1
the filter surface is enclosed by an elastic filter screen in such a manner that the elastic filter screen can be clamped onto the filter base body there
Data Source
AI summary
A device for filtering a plastic melt, having a housing that has at least one inlet passage and at least one outlet passage for the plastic melt. The at least one inlet passage is separated from the at least one outlet passage by at least one filter cavity for accommodating at least one filter piston that is axially displaceable therein. The at least one filter piston has at least one filter base body with a filter surface with filter openings passing through the filter base body there, through which openings the plastic melt passes into a filtrate cavity in the filter base body. The filtrate cavity is fluidically connected to the at least one outlet passage, and the filter surface of the filter base body is enclosed by a flexible, elastic filter screen in such a manner that this filter screen can be clamped onto the filter base body there.