Screen Plate Support Structure for Wet Paper Fiber Screening
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Solution Overview
Problem
Wet screening devices for paper fiber suspensions face issues with clogging, pressure loss, and structural stress due to hydraulic impulses and vibrations, leading to complex and costly support structures that reduce the free screen area.
Innovation Solution
A screening device with a detachable screen plate attached to an outer and inner support ring and a middle support element, utilizing elastic pre-stressing to absorb vibrations and thrusts, reducing the need for screw joints and minimizing the blocked screen area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex and sturdy attachment structure is used to secure the screen plate against vibrations and hydraulic impulses, then the reliability and strength of the support structure is improved, but the free screen area is reduced and the device complexity increases
Solution Approach 1:
The support structure is divided into an inner support ring and an outer support ring that are separated radially, with the screen plate positioned between them. This segmentation allows the screen plate to be securely attached while minimizing the blocked screen area, as each ring independently provides support without requiring a continuous complex attachment structure.
Solution Approach 2:
The support rings are arranged in different radial dimensions (inner and outer rings), providing multi-dimensional support to the screen plate. This dimensional approach allows the screen plate to be secured against vibrations and hydraulic impulses from multiple directions while maintaining maximum free screen area.
2Strength
If multiple screw joints are used to attach the screen plate securely, then the strength and reliability of the attachment is improved, but the manufacturing cost and device complexity increase
Solution Approach 1:
The attachment system is segmented into two independent support rings (inner and outer) that can be mounted separately. This reduces the number of screw joints required compared to a single complex attachment structure, while maintaining secure attachment strength through distributed fastening points on each ring.
Solution Approach 2:
The inner and outer support rings serve multiple functions: they provide structural support, secure the screen plate against vibrations, resist hydraulic impulses, and facilitate easy mounting and removal. This multi-functionality reduces the need for additional specialized components and screw joints.
3Area of stationary object
If a simplified support structure with fewer attachment points is used, then the free screen area is increased and the device complexity is reduced, but the ability to withstand vibrations and hydraulic impulses is worsened
Solution Approach 1:
By introducing both inner and outer support rings at different radial positions, the support structure provides multi-dimensional resistance to vibrations and hydraulic impulses. This dimensional distribution of support points enhances the ability to withstand harmful forces while maintaining a simplified structure with minimal attachment points that preserve free screen area.
Solution Approach 2:
The inner and outer support rings act as counterbalancing elements that distribute and counteract the forces from vibrations and hydraulic impulses. The radial separation between the rings creates a balancing effect that resists directional forces while requiring fewer attachment points than a single massive support structure.
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 durable and simplified support structure that maintains screen efficiency while reducing costs and structural stress, allowing for easier mounting and minimizing the loss of free screen area.
Implementation Method 1
Elastic pre-stressing against the screen plate is generated, and as a result of the elastic pre-stressing, the screen plate exerts compressive forces on at least one radially intermediate support element and respectively exerts tensile forces both on the inner support ring and on the outer support ring
Data Source
AI summary
A screening device for the wet screening of a paper fiber suspension comprising at least one screen plate having a plurality of screen openings, a support structure being detachably attachable to the screen plate, a rotor movable adjacent the screen plate and an outlet opening for a portion of the paper fiber suspension passing the screen openings The support structure of the device is characterized by an outer support ring and an inner support ring and at least one middle support element arranged radially between the inner and outer support rings to support the at least one screen plate. Elastic pre-stressing against the screen plate is generated, and as a result of the elastic pre-stressing, the screen plate exerts compressive forces on at least one radially intermediate support element and respectively exerts tensile forces both on the inner support ring and on the outer support ring.