Variable-Ratio Blending Applicator Air Manifold Flow Control
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Solution Overview
Problem
Existing agricultural metering systems face issues with inconsistent flow rates, blockages due to clumping and foreign objects, high power consumption, and inefficient product delivery, leading to reduced efficiency and increased downtime.
Innovation Solution
The system incorporates a seed metering flow control device with a resilient cylindrical roller and angled discharge portion for consistent product flow, a blockage detection process using stepper motor tuning and sensors, and an improved air manifold with venturi assemblies to prevent product accumulation and ensure continuous delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a resilient roller is used to meter agricultural products, then the metering mechanism is simple and reliable, but the flow rate becomes inconsistent and products are deposited in pulses rather than steady flow
Solution Approach 1:
The roller surface is made dynamically adjustable through variable speed rotation. By changing the rotational speed of the roller, the system transitions from fixed-pulse deposition to continuous steady-flow deposition, allowing the same simple mechanical structure to achieve both simplicity and flow consistency
Solution Approach 2:
The rotational speed parameter of the roller is varied to control the flow characteristics. By adjusting this parameter, the system can maintain consistent flow rates and prevent pulsing deposition, resolving the contradiction between simple mechanism and stable flow
2Productivity
If the roller surface is contoured with scallops or pockets to contain agricultural products, then products can be transported along the housing, but blockages occur when moisture causes clumping or foreign objects are introduced
Solution Approach 1:
Vibration is applied to the roller or housing to prevent clumping of moist agricultural products and to dislodge foreign objects that may cause blockages. This mechanical vibration maintains product flow efficiency while preventing the reliability issues associated with clumping
Solution Approach 2:
The static mechanical containment structure (scallops/pockets) is supplemented or replaced with a dynamic vibration mechanism that actively prevents blockages, transitioning from passive containment to active blockage prevention
3Measurement precision
If the roller is electrically driven by a stepper motor, then precise control is achieved, but power consumption increases and the motor may stall when blockages occur
Solution Approach 1:
The system uses the agricultural products themselves to drive the roller through friction, replacing the need for an external electric stepper motor. This self-service approach eliminates high power consumption while maintaining precise flow control through the natural interaction between products and roller surface
Solution Approach 2:
A pneumatic or hydraulic system is used to drive the roller, providing precise control with lower energy consumption compared to electric motors. The fluid pressure system can maintain precision while reducing power requirements and avoiding stall issues
4Device complexity
If small pockets of agricultural product are released into the soil, then the metering mechanism is simple, but insufficient space is provided for plant growth and uneven product distribution occurs
Solution Approach 1:
The system transitions from intermittent pulse deposition to continuous steady-flow deposition of agricultural products. This continuous action ensures uniform distribution across the target area, providing adequate spacing for plant growth while maintaining simple mechanism 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
The solution ensures a steady flow of agricultural products, reduces power consumption, detects and clears blockages remotely, and maintains continuous product delivery, thereby enhancing efficiency and minimizing downtime.
Implementation Method 1
Each venturi assembly comprises a venturi, a second air stream supply driving a second air stream through the venturi so as to accelerate the first air stream
Implementation Method 2
The circumferential outer surface of the roller is resiliently biased against the correspondingly curved inner surface of the metering housing. As the granular agricultural product falls from the local hopper into the metering housing, and as the roller rotates within the housing, the granulated agricultural product becomes wedged in between the outer surface of the roller and the corresponding inner surface of the metering housing
Data Source
AI summary
An air manifold system for supplying an agricultural product to a plurality of metering devices comprises a product hopper having a product flow cavity, the product cavity separated from a first plenum by an air agitator sandwiched between the first plenum and the product flow cavity. The hopper comprises a plurality of nozzles extending through a wall of the hopper. A venturi assembly is in fluid communication with at least one nozzle. A first forced air stream flows through the first plenum and the air agitator into the product flow cavity to agitate and entrain agricultural product in the first air stream, and the first air stream carries the entrained agricultural product into the nozzles. A second forced air stream flows through the venturi assembly to accelerate the first air stream and the entrained product towards and through the supply hoses connected to the nozzles.