Dual Rotor Spreader With Deflection And Speed Control
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Solution Overview
Problem
Conventional single rotor spreaders have limitations in distribution pattern, rate, and amount of material distribution, and require manual adjustment of application rate, which can lead to uneven coverage and application issues when users walk at varying speeds.
Innovation Solution
A dual rotor configuration with a material deflection system and a walking speed indicator, allowing for improved distribution accuracy and controlled application rate through dual impellers and a portable electronic device holder, enabling precise distribution and preventing material from being thrown onto undesired areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single rotor configuration is used, then the device complexity is reduced, but the distribution pattern and coverage uniformity deteriorate
Solution Approach 1:
The single rotor is divided into two separate rotors that rotate in opposite directions. Each rotor handles a portion of the granular material distribution, creating two overlapping distribution patterns that combine to achieve uniform coverage across the target area, thereby resolving the contradiction between simplicity and distribution quality.
Solution Approach 2:
The distribution patterns from two oppositely rotating rotors are merged/combined to create a unified coverage pattern. The overlapping zones of the two rotors ensure uniform distribution, while the material deflection system merges the material flows to prevent gaps or excessive accumulation in any single area.
2Device complexity
If a single rotor rotates in one direction, then the device complexity is reduced, but the distribution uniformity deteriorates
Solution Approach 1:
The two rotors are configured to rotate in opposite directions (one clockwise, one counter-clockwise), creating asymmetric rotation patterns that complement each other. This asymmetric configuration ensures that material is distributed uniformly across the coverage area by preventing the directional bias that would occur with a single unidirectional rotor.
3Ease of operation
If application rate adjustment mechanism throttles flow rate, then the application rate control is achieved, but the distribution rate and coverage area are reduced
Solution Approach 1:
The system dynamically adjusts the distribution characteristics by varying the rotation speeds of the two rotors independently. By controlling the rotational velocity of each rotor, the system can optimize both the application rate and the distribution rate simultaneously, allowing high productivity while maintaining precise application rate control without relying solely on flow throttling.
4Device complexity
If no material deflection system is used, then the device complexity is reduced, but material is thrown onto undesired areas
Solution Approach 1:
The material deflection system acts as an intermediary component between the rotors and the target surface. It intercepts and redirects material that would otherwise be thrown onto undesired areas, guiding it toward the intended distribution zone and preventing harmful off-target deposition without requiring complex active control systems.
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
The dual rotor configuration and walking speed indicator enhance distribution accuracy and control, addressing the limitations of single rotor spreaders by ensuring consistent coverage and preventing material from being thrown onto undesired areas, while allowing users to maintain an optimal application rate.
Implementation Method 1
two impellers mounted to rotate in rotational correspondence about their axes as the device is moved in a forwardly advancing direction so as to broadcast particulate materials
Implementation Method 2
a velocity measuring system with the purpose to measure a linear velocity of the spreader
Implementation Method 3
comparing the determined linear velocity to a reference linear velocity value and controlling an application rate of the granular material based on the comparison
Data Source
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AI summary
A spreader for broadcasting granular or particulate material over a surface includes a dual rotor configuration, a material deflection system, and a portable electronic device holder. The material deflection system includes components for deflecting material broadcasted by each of the rotors. The spreader includes a walking speed indicator to inform the user whether the current speed is too fast, too slow, or within an acceptable reference range.