Rotating Tube Screening Element for Bulk Material Handling
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Solution Overview
Problem
Existing screening devices face challenges in handling cohesive materials and large, heavy chunks, leading to clogging and reduced load capacity due to inadequate design in transferring forces and protecting components.
Innovation Solution
A screening device with a rotating, elongated screening element mounted on a frame, featuring a shaft, bearing tube, and rotating tube where the rotating tube partially covers the bearing tube, transferring forces to the frame, and incorporating multiple rotary tube parts, pins, and axially directed webs for enhanced load distribution and protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If bar gratings or vibrating gratings are used as pre-separators, then large chunks can be protected, but cohesive material causes clogging and reduces productivity
Solution Approach 1:
The patent employs rotating tubes instead of static gratings, creating a dynamic screening surface that prevents cohesive material from adhering and clogging. The rotational motion continuously clears the screening surface, maintaining both load capacity and productivity.
Solution Approach 2:
The rotation of the tubes creates mechanical vibration and movement that prevents cohesive material from settling and clogging the screening openings, thereby maintaining screening efficiency while handling heavy loads.
2Device complexity
If spiral rollers are mounted on thin shafts, then device complexity is reduced, but buckling load increases and reliability decreases
Solution Approach 1:
The shaft is segmented into multiple sections with intermediate support points, dividing the long span into shorter segments that can better support their own weight and resist buckling under load.
Solution Approach 2:
The patent introduces a third dimension by mounting shafts at an angle to the horizontal plane, allowing the shafts to better distribute loads and resist buckling through geometric configuration rather than simply increasing shaft thickness.
3Ease of manufacture
If the bearing tube is exposed, then ease of manufacture is improved, but the bearing tube becomes vulnerable to damage from large chunks
Solution Approach 1:
The bearing tube is nested within the rotating tube structure, with the bearing tube positioned inside the hollow interior of the rotating tube. This nested configuration provides protective enclosure while maintaining manufacturing simplicity.
Solution Approach 2:
The rotating tube acts as an intermediary protective layer between the bearing tube and harmful external factors such as large chunks of material, absorbing impacts before they reach the vulnerable bearing tube.
Data Source
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AI summary
A sieve device with at least one rotating, elongated sieve element mounted on one side of a frame. According to the invention, the sieve element comprises a shaft, a bearing tube, and a rotating tube, wherein the bearing tube is fixedly held on the frame, the shaft is mounted in the bearing tube, and the rotating tube is connected to the shaft.