Metering Unit for Granular Material with Curved Inner Surface
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Solution Overview
Problem
Existing seed sowing technologies struggle to achieve consistent, equidistant grain spacing, particularly in cereals, sunflowers, and rape, due to economic and technical limitations, leading to variable grain distribution during pneumatically assisted sowing in conventional seed drills.
Innovation Solution
A metering unit with a tangentially connected feed line and an approximately circular arc-shaped inner surface, equipped with a rotating separating disk and a fan sieve with guide webs, ensures partial separation of granular material from the air flow, guiding grains into uniform spacing and accurate discharge through a curved outlet line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional pneumatic sowing is used, then sowing speed is maintained, but grain spacing becomes variable and inconsistent
Solution Approach 1:
The metering unit divides the continuous air flow into discrete segments, each carrying a single grain. The circular arc-shaped inner surface segments the grain flow path, while the outlet line tangentially connected to the metering unit creates separate discharge zones. This segmentation ensures each grain is delivered individually at consistent intervals, resolving the contradiction between spacing precision and sowing speed.
Solution Approach 2:
The metering unit employs periodic grain release through the tangentially connected outlet line, creating regular intervals between grain deliveries. The circular arc-shaped inner surface guides grains in a periodic manner around the curve, ensuring consistent spacing. This periodic action maintains steady sowing speed while achieving uniform grain distribution.
2Manufacturing precision
If grain singling is improved for single-grain sowing, then grain spacing becomes equidistant, but device complexity increases
Solution Approach 1:
The metering unit utilizes a circular arc-shaped inner surface with an arc angle of at least 180 degrees, creating a curved guidance path for grains. This curvature naturally guides grains in a controlled manner around the arc, enabling grain singling and equidistant spacing without complex mechanical components. The tangentially connected outlet line further leverages this curvature to discharge grains uniformly, achieving high precision with relatively simple geometry.
Solution Approach 2:
The invention employs pneumatic principles by using air flow to transport grains through the metering unit. The air stream carries grains along the circular arc path and through the tangentially connected outlet line, eliminating the need for complex mechanical grain handling mechanisms. This pneumatic approach achieves accurate grain singling and spacing while keeping the device structure relatively simple.
3Object-generated harmful factors
If grains are conveyed through a straight outlet line, then discharge is simple, but grain collisions and turbulence increase
Solution Approach 1:
The outlet line is designed as a curved structure that is tangentially connected to the metering unit, following the circular arc path. This curved geometry guides grains smoothly through the discharge process, reducing sudden directional changes that would cause collisions and turbulence. The curved outlet line maintains grain flow stability while achieving simple discharge, resolving the contradiction between harm reduction and geometric complexity.
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 enables precise, equidistant grain spacing and distribution, reducing grain collisions and turbulence, ensuring consistent seed placement with increased accuracy and efficiency, even for smaller seeds like rapeseed.
Implementation Method 1
granular material which is carried and conveyed by an air flow and passed through a feed line into a metering unit
Implementation Method 2
devices for at least partial separation of the granular material guided on the inner jacket surface from the carrying and conveying air flow
Data Source
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AI summary
A metering unit for dispensing granular material such as seeds, fertilizer, or the like is disclosed, which can in particular be a component of a distribution or seeding unit of a distribution or seeding machine (10). A feed line (38) opening tangentially into a metering unit (40) serves to supply an airflow (26, 36) that carries and conveys the granular material, wherein the metering unit (40) has an approximately arc-shaped inner surface (62) with an arc angle of at least 180 degrees, in particular 270 degrees or more, and with means for at least partially separating the granular material guided on the inner surface (62) from the carrying and conveying airflow (26, 36).An outlet line (44), which connects tangentially to the metering unit (40) and runs at least partially in a straight line or is slightly curved, serves to discharge the airflow (46) containing the approximately uniformly metered and/or equidistantly conveyed granular material. Within the metering unit (40), at least one guide edge and a rotating carrier and/or singulation disc (42, 52) equipped with compartments (50) are arranged. The invention discloses a corresponding method for metering granular material.