Pneumatic Spreader Throttling for Uniform Granular Distribution
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Solution Overview
Problem
Existing agricultural machines fail to distribute granular solids evenly over outlet openings due to varying dynamic pressures in pneumatic conveying systems, leading to unequal throughput quantities despite identical outlet opening sizes.
Innovation Solution
The implementation of throttle elements on outlet openings, lines, and dispensing units to adjust dynamic pressures uniformly across all lines, using adjustable hose clamps, reducers, or pinholes to ensure equal distribution quantities, with optional sensor systems for automatic control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If identical outlet openings are used in the distribution chamber, then the structural simplicity and manufacturing ease are improved, but the uniformity of solid material distribution deteriorates due to varying back pressures in different lines
Solution Approach 1:
The patent applies local quality by making the outlet openings non-identical to compensate for varying back pressures in different lines. Specifically, outlet openings in lines with higher back pressure are designed with larger cross-sectional areas than those in lines with lower back pressure. This local variation in outlet opening characteristics ensures uniform solid material distribution across all lines despite the inherent pressure differences caused by varying line lengths and configurations.
2Device complexity
If outlet openings of the same size are used, then the device complexity is reduced, but the throughput quantity uniformity across lines deteriorates due to different back pressures
Solution Approach 1:
The patent implements local quality by varying the cross-sectional areas of outlet openings based on the specific back pressure conditions of each line. Lines with higher back pressure receive outlet openings with larger cross-sectional areas, while lines with lower back pressure receive smaller outlet openings. This localized adaptation maintains relatively simple device structure while achieving uniform throughput quantities across all lines.
3Adaptability or versatility
If the pneumatic conveying system operates with varying back pressures in different lines, then the system flexibility and adaptability are improved, but the distribution precision of granular solids deteriorates
Solution Approach 1:
The patent resolves this contradiction by applying local quality principles to the outlet openings. Each outlet opening is specifically sized according to the back pressure conditions of its associated line, allowing the system to maintain flexibility and adaptability while achieving precise and uniform granular solid distribution. The varying cross-sectional areas of outlet openings compensate for the varying back pressures, ensuring that each line receives the appropriate quantity of solids.
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 solution ensures that granular solids are distributed evenly across all outlet openings, achieving approximately equal throughput quantities by adjusting dynamic pressures and sector sizes, thereby improving the distribution efficiency and precision of granular materials.
Implementation Method 1
a pneumatic conveying system for transporting the granular solids from a storage tank to a number of dispensing units, wherein the conveying system comprises a blower
Implementation Method 2
arranging throttling elements at the outlet openings, the lines and/or the output units, which increase the back pressure in the line in question... equalize the volume of airflow into the outlet openings
Data Source
Figure 1
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AI summary
The present invention relates to an agricultural machine for spreading granular solids with a pneumatic conveying system for transporting the granular solids from a storage tank (4) to a number of dispensing units, wherein the conveying system comprises a blower (6), a connecting line (8) from the tank to a distribution device (10) which has a distribution chamber (12) with a number of discharge openings (14) formed therein, and a number of lines (16) which are each connected to an associated discharge opening (14A, 14B, 14) and which direct the solids conveyed by the airflow to a dispensing unit associated with the line (16).