Uniform Thickness Screen Element for Hubless Torque Transmission
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Solution Overview
Problem
Existing star and disk screens face challenges in cost-effective production and efficient torque transmission without the use of hubs, which complicates manufacturing and affects screening precision.
Innovation Solution
The design includes axially compressing screen elements and spacers along driver profiles, with off-center passages for rod-like carrier profiles and spacers that can accommodate round or polygonal shafts, enabling torque transmission without hubs and simplifying manufacturing through water jet cutting of uniform thickness elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If screen elements are designed with an axially protruding hub to increase contact area for torque transmission, then torque transmission capability is improved, but manufacturing complexity increases and production cost rises
Solution Approach 1:
The invention extracts the hub from the screen element design, eliminating the axially protruding hub that previously increased manufacturing complexity. Instead, the screen element is designed as a simple disc-shaped component with a central opening that receives the screen shaft directly, reducing the number of parts and simplifying the manufacturing process while maintaining torque transmission capability through the enlarged contact area of the disc shape itself
Solution Approach 2:
The invention shifts the torque transmission mechanism from axial protrusion (hub extending in axial direction) to radial expansion (enlarged disc-shaped contact area). By increasing the radius of the screen element disc, the contact area with the screen shaft is enlarged in the radial dimension, providing sufficient frictional engagement and torque transmission without requiring axial hub protrusion
2Power
If screen elements are manufactured using the casting process to accommodate hub structures, then torque transmission is improved, but production cost and manufacturing time increase
Solution Approach 1:
The invention adopts a simpler screen element design that can be manufactured using more economical processes such as cutting or pressing uniform thickness panels, replacing the more expensive and time-consuming casting process. The simplified geometry without hubs makes these elements cheaper and faster to produce, improving overall productivity while maintaining sufficient torque transmission through the disc-shaped design
Solution Approach 2:
The invention separates the screen elements into simple, identical disc-shaped components of uniform thickness that can be independently manufactured and assembled. This segmentation allows for standardized production methods and simplifies the manufacturing process, enabling higher production volumes at lower cost compared to complex hub-integrated designs requiring casting
3Ease of manufacture
If screen elements are designed without hubs to simplify manufacturing, then production cost decreases, but torque transmission capability may be compromised
Solution Approach 1:
The invention changes the critical parameter for torque transmission from axial hub height to radial disc radius. By increasing the radius of the disc-shaped screen element, the contact area with the screen shaft is enlarged, providing sufficient frictional force and normal force for effective torque transmission. This parameter change maintains power transmission capability while enabling simpler manufacturing without hubs
4Reliability
If end caps with bolts are used to fasten screen shafts to ensure secure connection, then connection reliability is improved, but storage space requirements increase and assembly complexity rises
Solution Approach 1:
The invention extracts the end caps and bolts from the screen shaft assembly, eliminating these additional components. The screen shafts are designed to be directly insertable into the screen elements without requiring end caps for fastening, thereby simplifying the overall structure, reducing the number of parts, and easing both assembly and storage requirements while maintaining secure connection through the direct fit of the disc-shaped screen elements onto the shafts
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 allows for cost-effective production and high torque transmission, ensuring precise screening by eliminating the need for hubs and enhancing the clamping effect between screen elements and spacers, preventing slippage and improving overall torque transfer.
Implementation Method 1
The screen elements are slid onto the screen shafts and held on the screen shafts by frictional engagement or positive engagement effective in the direction of rotation
Implementation Method 2
individual screen elements can be cut out of a large panel, for example by water jet cutting
Data Source
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AI summary
The invention relates to a sieve element for star or disc sieves, with a central opening (18) for a sieve shaft. According to the invention, the sieve element has a substantially uniform thickness, i.e., without areas of varying thickness and without an axially projecting hub. The invention also relates to a sieve shaft and a star or disc sieve.