Cylindrical Screen Profile Bar Fixation via Internal Axial Pressing
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Solution Overview
Problem
Existing cylindrical screening devices for fibrous suspensions face challenges in reducing production costs while maintaining high strength and service life, particularly in achieving precise slot shapes and preventing blockages during the centripetal operation in pressure screens.
Innovation Solution
A method involving one-piece ring-shaped bar holders with open-edged recesses for profiled bars, where the bars are pressed radially into the holders using evenly distributed punches, reducing clearance and allowing for precise guidance and fixation without external bending forces, and optionally secured via welding or gluing if necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If profile bars are pressed radially into recesses using external forces, then the profile bars are fixed in the recesses, but the manufacturing complexity increases and the strength of bar holders decreases
Solution Approach 1:
Instead of pressing the profile bars radially from the outside into the recesses (conventional approach), the patent inverts the process by inserting the profile bars from the inside of the bar holders and pressing them axially from the interior. This reversal eliminates the need for complex external radial pressing mechanisms while achieving secure fixation through the clamping effect of the recesses on the bar bases.
2Reliability
If the radius of curvature of retaining rings is increased to fix profile bars, then the profile bars are secured, but the strength of the bar holders decreases
Solution Approach 1:
The patent inverts the conventional approach of increasing the radius of curvature from the outside. Instead, it inserts profile bars from the inside of the bar holders and presses them axially, utilizing the clamping effect of the recesses. This internal pressing method secures the profile bars effectively while preserving the structural strength of the bar holders, avoiding the need to increase the radius of curvature.
3Reliability
If profile bars are pressed radially from outside, then fixation is achieved, but work hardening and jamming occur
Solution Approach 1:
The patent eliminates work hardening and jamming by inverting the pressing direction. Instead of radial pressing from the outside that causes deformation and clearance reduction, the method inserts profile bars from the inside and presses them axially. This internal axial pressing achieves fixation through the clamping effect of the recesses on the bar bases without causing work hardening or jamming of the profile bars.
4Reliability
If radial pressing is applied from outside, then profile bars are fixed, but the inside of bar holders is not supported causing reduced strength
Solution Approach 1:
The patent inverts the pressing approach by applying force from the inside rather than from the outside. During internal axial pressing, the inside of the bar holders is directly supported by the pressing mechanism, distributing forces evenly and preventing bending or deformation. This internal support maintains the structural strength of the bar holders while achieving secure fixation of the profile bars through the clamping effect of the recesses.
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 simplifies manufacturing, enhances the accuracy of screen openings, reduces jamming, and increases the strength and service life of the screening devices by ensuring even force distribution and precise alignment of profile bars, thus improving the separation efficiency of fibrous and non-fibrous impurities.
Implementation Method 1
As the profile bars are pressed towards the recess of the bar holders, the clearance between the profile bar and the recess decreases, ultimately leading to jamming. In addition to jamming, this plastic deformation also results in work hardening.
Data Source
AI summary
The invention relates to a method for producing a cylindrical screen device with a plurality of profiled bars (1), wherein the outer face of a plurality of mutually spaced annular bar holders (3), which run perpendicularly to the cylinder axis (2), is provided with recesses (4) that are open at the edges, have a shape which substantially corresponds to the bases of the profiled bars (1) in a complementary manner, and are slightly larger than the bar bases, and the profiled bars (1) are inserted into the recesses (4) parallel to one another and parallel to the cylinder axis (2). The production complexity is to be reduced while improving the strength and increasing the service life of the screen device in that the profiled bars (1) are pressed into the recesses (4) via forces acting radially on the profiled bars (1) from the outside until a form-fitting connection is produced.