Spreading Unit With Interlocking Rotary Valves
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Solution Overview
Problem
Existing spreaders face challenges in achieving both high dosing accuracy for large and small spreading quantities with a low overall height, as they require large cellular wheels that are not feasible in existing designs, and struggle to maintain uniformity in spreading carpets.
Innovation Solution
A spreader design featuring two cellular wheels with intermeshing conveyor cells that operate in a gear-like manner, allowing for two conveying paths: one along the chamber walls for larger quantities and another between the wheels for smaller quantities, ensuring high dosing accuracy and uniformity, with elastic conveyor cells for self-cleaning and adjustable axes for optimal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If large-diameter rotors are used to achieve large spreading rates, then spreading capacity is improved, but installation height requirement increases
Solution Approach 1:
The single large rotor is segmented into two smaller rotary valves with fewer conveying cells each. This segmentation allows the system to achieve the same total spreading capacity while reducing the diameter and installation height requirements, as each smaller rotor fits within the limited vertical space while collectively handling the required material flow
Solution Approach 2:
The invention transitions from a single large-diameter rotor to two smaller rotors arranged side-by-side, effectively changing the spatial dimension from vertical (height) to horizontal (width). This dimensional shift allows the system to maintain spreading capacity while adapting to the height constraints of existing construction environments
2Device complexity
If a single rotary valve is used, then device simplicity is maintained, but dosing accuracy for varying quantities deteriorates
Solution Approach 1:
The single rotary valve is divided into two separate rotary valves, each capable of independent operation with different rotational speeds. This segmentation enables precise dosing control for varying material quantities by adjusting the speed of individual rotors, while maintaining relatively simple device architecture through the use of identical modular components
Solution Approach 2:
The system introduces dynamic adjustability by allowing the two rotary valves to rotate at different speeds independently. This dynamic capability enables the device to adapt dosing accuracy to varying spreading requirements, transitioning from a static single-rotor design to a flexible multi-rotor system
3Device complexity
If conveying cells operate along chamber walls, then structure simplicity is maintained, but spreading uniformity deteriorates
Solution Approach 1:
The single conveying path along chamber walls is segmented into two distinct conveying paths, one for each rotary valve. This segmentation allows material to be distributed more uniformly across the spreading surface, as each rotor handles a portion of the material flow, improving overall spreading uniformity while maintaining simple modular conveyor cell designs
Solution Approach 2:
The invention introduces an intermediary conveying path between the two rotary valves, where material is transferred from one rotor to the other. This intermediary path acts as a mediator that enhances spreading uniformity by distributing material more evenly, while the overall system remains relatively simple through the use of identical modular components
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
Spreading unit (1), in particular for a spreading device for construction, agricultural or environmental technology, with at least one rotary valve (3) having an inlet opening (31) and an outlet opening (32) and a conveying chamber (33) arranged between them. In the conveying chamber (33) at least two rotary valves (34, 35) arranged side by side in the conveying direction (36). The conveying cells (341, 351) interlock between the two rotary valves (34, 35). The rotary valve (3) has: a first conveying path in which the spreading material (2) is transported by the conveying cells (341, 351) along the walls (331, 331) of the conveying chamber (3) from the inlet opening (31) to the outlet opening (32), and/or a second conveying path in which the spreading material (2) is transported by the interlocking conveying cells (341, 351) from the inlet opening (31) to the outlet opening (32). Furthermore, a spreading device with such a spreading mechanism is described.