Screening Cylinder End Ring Fastening via Detachable Screws
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Solution Overview
Problem
Existing cylindrical screening devices face issues with the connection of end rings, which are prone to breaking due to high stress and welding-related problems, leading to distortion and blockages in sieve openings.
Innovation Solution
A detachable screw connection is used for the outer rod holder to the end ring, with profiling on the profile bars and complementary shaping to prevent axial displacement, and a blocking ring is axially fixed to enhance stability and load capacity, allowing for precise alignment and easy assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If welding is used to connect end rings to rod holders, then structural strength is improved, but manufacturing precision deteriorates due to distortion and blockages in sieve openings
Solution Approach 1:
The connection system is divided into separate components: end rings, rod holders, and profile bars. The detachable screw connection allows assembly without welding, preventing heat-affected zone distortion. Each component can be manufactured with high precision independently and then assembled using threaded fasteners that do not generate thermal distortion.
Solution Approach 2:
The welding process (thermal-mechanical system) is replaced with a screw connection system (pure mechanical system). This substitution eliminates the thermal effects that cause distortion while maintaining structural integrity through properly designed threaded fasteners and locking mechanisms.
2Strength
If welding is used to connect end rings, then structural integrity is improved, but reliability deteriorates due to breaking at weld seams under high stress
Solution Approach 1:
The connection is segmented into multiple fastener points distributed around the circumference of the end ring to rod holder connections. This distributes the stress across multiple independent connection points rather than concentrating it at a continuous weld seam, reducing the risk of catastrophic failure.
Solution Approach 2:
The design incorporates locking rings and complementary profiling that prevent axial displacement before excessive stress can develop. This preventive mechanism cushions against the high stresses that would otherwise lead to breaking at weak points.
3Manufacturing precision
If profile bars are rigidly fixed to prevent axial displacement, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The locking mechanism uses local complementary profiling at specific contact areas between the blocking ring and profile bars. Rather than requiring complex fastening along the entire length, the precision positioning is achieved through localized geometric interlocking features that are simple in form but effective in function.
Solution Approach 2:
The complementary profiling creates a self-locking mechanism where the geometry itself prevents axial displacement. The profiled surfaces of the blocking ring and profile bars work together to automatically maintain precise positioning without requiring additional active control or complex adjustment mechanisms.
Data Source
Figure 1~4b
AI summary
The invention relates to a cylindrical screening device comprising a plurality of profile bars (1), in which a plurality of annular bar holders (3, 5) extending perpendicular to the cylinder axis (2) and spaced apart from one another, or packs of bar holders (3, 5) spaced apart from one another, are provided on the inside or outside with open-edged recesses (4), the shape of which corresponds in a substantially complementary manner to that of the feet of the profile bars (1), and the profile bars (1) are inserted, parallel to one another and parallel to the cylinder axis (2), into the recesses (4), an outer bar holder (5) in being arranged in the region of each end ring (6) of the screening device. The fastening of the end ring (6) should be simplified by at least releasably connecting each outer bar holder (5) to the relevant end ring (6).