Segmented Turnover Shovel for Uniform Drying
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Solution Overview
Problem
Existing drying technologies face challenges in achieving continuous arrival and removal of drying material and uniform drying due to the formation of conglomerates during the turnover process, which are difficult to back-mix and result in uneven drying.
Innovation Solution
A turnover device with a rotatable shovel and a retaining device that interacts with the shovel to prevent conglomerates from being pushed ahead, allowing for continuous transportation and uniform drying by creating a moisture gradient, and includes adjustable features for optimal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a mixing and raking-out device is used to turn over moist material in a drying bed, then uniform drying is achieved through continuous mixing, but conglomerates of moist material form during the turnover process and are difficult to back-mix
Solution Approach 1:
The shovel is divided into multiple segments or sections along its length, with each segment capable of independent rotation or movement. This segmentation allows the shovel to handle material in discrete portions, preventing the formation of large conglomerates while maintaining continuous mixing action for uniform drying.
Solution Approach 2:
The shovel design incorporates dynamic elements that allow it to adapt its configuration during operation. The shovel can change its angle, rotation speed, or segment movement patterns based on the material state, enabling effective back-mixing of conglomerates while maintaining uniform drying conditions.
2Productivity
If the shovel rotates within a circumference to turn over material, then continuous mixing is achieved, but conglomerates are pushed ahead by the shovel and not back-mixed into the material
Solution Approach 1:
Instead of the shovel simply pushing material forward during rotation, the design incorporates mechanisms that actively pull or draw material backward toward the center of rotation. This inverted action ensures conglomerates are back-mixed into the bulk material rather than being pushed ahead and removed, maintaining material homogeneity while preserving continuous mixing productivity.
3Productivity
If the turnover device moves material continuously through the drying installation, then productivity increases, but moisture gradients cause uneven drying with some material removed while still moist
Solution Approach 1:
The shovel rotation and material turnover is designed as a continuous cyclic process rather than intermittent operation. The shovel continuously lifts, turns, and redistributes material through its circumferential rotation, maintaining constant mixing action throughout the drying process. This continuous useful action ensures all material portions receive equivalent treatment, achieving uniform drying while maintaining high productivity through uninterrupted processing.
Data Source
AI summary
A turnover device is provided to turn over and back-mix moist material, in particular sewage sludge in moist or dry state in a dryer in which the moist material is spread out for drying on a floor in one layer. The turnover device is provided with at least one shovel that can be rotated within a circumference around an axis.