Waisted Screen Mesh Geometry for Screening Machine
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Solution Overview
Problem
Existing plastic screen cloths for screening machines suffer from deformation under load, leading to increased defective grains and premature wear due to notch stresses and inadequate mesh shape, particularly in fine-grained screening applications.
Innovation Solution
The screen meshes are designed with a narrow central area and wider end areas, featuring a waisted shape that maintains an approximately rectangular form under load, with reinforcing threads and a conical cross-section to enhance strength and prevent jamming, and arranged in a lattice structure for optimal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If rectangular screen meshes are used, then the screen cloth can be manufactured with simple geometry, but the meshes deform into oval shapes under load causing larger particles to pass through and increasing defective grains
Solution Approach 1:
The screen mesh is designed with non-uniform geometry, featuring a narrow central area and broader end areas. This local variation in geometry allows the mesh to deform preferentially in the central region under load, maintaining the intended aperture size for particle screening while absorbing deformation in a controlled manner that prevents oval distortion.
2Ease of manufacture
If rectangular screen meshes with perpendicular corners are used, then the structure is simple to manufacture, but notch stresses arise at the corners leading to crack formation and premature wear
Solution Approach 1:
The screen mesh geometry transitions from symmetric rectangular shape to an asymmetric form with a narrow central area and broader end areas. This asymmetric design eliminates the perpendicular corners that generate notch stresses, distributing mechanical stresses more evenly throughout the mesh structure and preventing crack initiation at corner regions.
3Manufacturing precision
If the screen meshes are made with small web widths and high length-to-width ratios, then the screening precision can be improved, but the meshes become more prone to deformation and wear
Solution Approach 1:
The screen mesh geometry is modified by changing the parameter distribution along its length, creating a waist-shaped profile with a narrow central area and broader end areas. This parameter variation allows the mesh to maintain high screening precision in the central region while the broader end areas provide additional structural strength and resistance to deformation and wear.
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 design achieves precise screening and extended service life by minimizing deformation and stress concentrations, ensuring high precision and throughput even in fine-grained materials.
Implementation Method 1
The screen meshes pre-profiled according to the invention are widened the most in the narrow central area having the minimum width under the strain of the plastic screen lining during screening in the screen plane
Data Source
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AI summary
The invention relates to a plastic screen lining for a screening machine for classifying particularly fine-grained material, the screen meshes (1a; 1b; 1c; 1d) formed by longitudinal ribs (4) and transverse ribs (5) extend longitudinally or transversely to the direction of the screening process (A) and each have a mirror-symmetrical shape in both the longitudinal direction (L) and the transverse direction (Q), wherein the screen mesh (1a; 1b; 1c; 1d) has a narrow central area () in the longitudinal direction (L), the minimum width (Bm) of which is smaller than the maximum width (Be) of the end areas (7a, 7b) adjacent on both sides.