Rotary Chute Spreader Axis Inversion for Precision
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Solution Overview
Problem
Centrifugal spreaders with chutes face issues in spreading precision due to deformation of the particle drop point on the spreading disc, leading to variations in the spreading angle and shape, which complicates width adjustment and reduces precision.
Innovation Solution
A chute mounted on an adjustment lever rotating around a vertical axis coinciding with the spreading disc's axis of rotation, using a circular dosing bottom to guide the chute's movement, maintains a constant distance and reduces geometric modifications of the drop point, resulting in a linear relationship between chute displacement and particle ejection angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the chute is pivoted around an offset axis to adjust spreading width, then the spreading width can be adjusted, but the drop point shape becomes elongated and standard deviation increases, reducing spreading precision
Solution Approach 1:
Instead of pivoting the chute around an offset axis (conventional approach), the invention inverts the approach by pivoting the chute around an axis that coincides with the rotation axis of the spreading disc. This reversal of the pivot axis location maintains a constant distance between the chute and disc center, preventing drop point deformation and maintaining spreading precision while still allowing width adjustment through chute angular displacement.
2Measurement precision
If the chute position is moved to adjust the drop point position on the disc, then the spreading angle changes, but the drop point shape deforms and standard deviation varies, complicating control
Solution Approach 1:
The invention inverts the conventional approach by changing the pivot axis location from an offset position to a position coinciding with the disc rotation axis. This allows the chute to be angularly displaced to change the spreading angle while maintaining a constant radial distance from the disc center, thereby preventing drop point shape deformation and maintaining consistent standard deviation, which simplifies control.
3Ease of operation
If a chute-based system is used instead of a rotating bottom with orifices, then cleaning is easier and clogging risk is reduced, but spreading precision is reduced due to drop point deformation
Solution Approach 1:
The invention retains the chute-based system for its cleaning and clogging advantages but inverts the pivot axis location from an offset axis to one coinciding with the disc rotation axis. This inversion eliminates the drop point deformation issue that plagued conventional chute systems, thereby maintaining spreading precision while preserving the operational ease benefits of the chute design.
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 enhances spreading precision by minimizing standard deviation in the spreading angle, allowing for accurate width adjustments and maintaining compactness, while simplifying the mechanism and reducing bulkiness compared to prior art.
Implementation Method 1
a chute, which serves to transport the particles by gravity, from the hopper to the rotating disc
Implementation Method 2
the product to be spread can in particular be stored in a hopper, and brought or poured above each disc by a chute, which lets the flow of particles fall freely onto the disc, so that it is projected via the blades onto the ground
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
The invention relates to a device for spreading particles stored in at least one hopper (110) having at least one outlet opening delivering particles into at least one chute (10), one outlet end of which is positioned above a rotating spreading disc (12) that receives and projects said particles. According to the invention, the chute (10) is mounted in line with an adjustment lever (20) that is rotatable about a substantially vertical axis of rotation (21) that substantially coincides with an axis of rotation of the spreading disc. A metering base (11), forming the lower part of the hopper (110), has a substantially horizontal circular cross-section, referred to as the circular portion, around which the adjustment lever (20) moves, along at least a portion of the base.