Metering Device Sealing Element for Granular Material Dosing
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Solution Overview
Problem
Existing dosing devices for granular materials in distribution machines suffer from inadequate dosing accuracy, particularly on uneven terrain and when the machine is partially folded, and are prone to material jamming and increased drive power requirements due to insufficient sealing and axial guidance.
Innovation Solution
A dosing device with a dosing wheel connected in a force-locking manner to a shaft, featuring smooth wheels as axial guides and sealing elements that prevent material transport against the dosing direction, and a design that minimizes contact areas to reduce torque and wear, along with elastic elements to compensate for manufacturing tolerances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If smooth wheels are arranged loosely on the shaft without sealing elements, then the device complexity is reduced, but granular material can become jammed between the dosing wheel and smooth wheels, reducing dosing accuracy and increasing drive power requirements
Solution Approach 1:
A sealing element is introduced as an intermediary component between the dosing wheel and smooth wheels. This sealing element prevents granular material from becoming jammed in the gap between these rotating components, thereby maintaining dosing accuracy without significantly increasing device complexity
Solution Approach 2:
The sealing element changes the physical parameters of the interface between dosing wheel and smooth wheels by creating a sealed gap. This prevents material penetration into the gap while allowing the wheels to rotate freely, thus improving reliability without major structural changes
2Ease of operation
If the dosing housing is open at the top for easy filling, then the ease of operation is improved, but granular material can escape from the housing and be distributed in undesirable locations, particularly on slopes and uneven terrain
Solution Approach 1:
The dosing housing is segmented into an open top section for filling and a sealed lower section for metering. The sealing element creates a distinct boundary that allows material to be loaded easily from the top while preventing escape during operation on slopes or uneven terrain
Solution Approach 2:
The sealing element acts as an intermediary barrier within the housing that allows the top to remain open for filling while preventing material from escaping through the metering section, thus maintaining both ease of operation and dosing accuracy
3Ease of repair
If the dosing wheel is connected loosely to the shaft, then the ease of repair is improved, but the dosing accuracy deteriorates due to slippage and inconsistent material transport
Solution Approach 1:
The connection between dosing wheel and shaft transitions from a static loose fit to a dynamic force-locking connection. The dosing wheel can still be removed for repair, but during operation, friction and normal forces create a locked connection that prevents slippage and ensures precise material transport
Solution Approach 2:
The force-locking connection utilizes normal forces and friction (analogous to pneumatic/hydraulic pressure principles) to create a secure connection between the dosing wheel and shaft during operation, preventing slippage while allowing easy removal when not in use
4Manufacturing precision
If increased drive power is applied to prevent material jamming and ensure consistent dosing, then the dosing accuracy is improved, but the use of energy increases
Solution Approach 1:
The sealing element acts as a mediator that prevents material from jamming between the dosing wheel and smooth wheels. By eliminating jamming, the drive power required to rotate the wheels is significantly reduced while maintaining dosing accuracy
Solution Approach 2:
The potential harm of material jamming between rotating components is converted into a benefit by introducing the sealing element. The sealing element creates a controlled interface that prevents harmful jamming while allowing beneficial friction for force transmission, thus reducing energy consumption
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
Enhances dosing accuracy, reduces the risk of material jamming, and decreases drive power requirements by ensuring precise material transport and minimizing wear on components, thus improving operational reliability and reducing maintenance needs.
Implementation Method 1
a sealing element (16) arranged between the end face (13a) of the dosing wheel (13) and a side surface (15a) of the smooth wheel (15) facing this end face (13a)
Implementation Method 2
a spring element (17) arranged between the sealing element (16) and the smooth wheel (15) and acting in the direction of the side walls (10)
Implementation Method 3
the granular material freely trickles through the inlet (8) onto the metering wheel (13)
Data Source
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AI summary
The invention relates to a metering device (5) for a granular material, particularly seeds and/or fertilizer, wherein the metering device (5) comprises a metering housing (9) having at least one inlet (8) and at least one outlet (11) for the granular material and two lateral walls (10) which are spaced apart from each other, wherein a metering wheel (13), which has end faces (13a) which each point toward the lateral walls (10), between the inlet (8) and the outlet (11), and between the lateral walls (10) which are spaced apart from each other, can be frictionally connected on a shaft to the latter and can be driven rotatingly by the shaft in a metering direction (D). Blocking means (14), which are designed to block the metering wheel (13) counter to the metering direction (D) from the inlet (8) to the outlet (11) and/or in the metering direction (D) from the outlet (11) to the inlet (8) against the transport of granular material, are associated with the metering wheel (13), and a smoothing wheel (15) is arranged on each end face (13a) of the metering wheel (13), extends between the end face (13a) and the lateral wall (10), and is arranged in an unfastened manner on the shaft, wherein a sealing element (16) is arranged on both sides between the particular end face (13a) of the metering wheel (13) and a lateral face (15a) of the particular smoothing wheel (15) pointing toward this end face (13a).