Curved Outlet Line for Uniform Granular Material Dosing
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Solution Overview
Problem
Existing seed drills struggle to achieve uniform grain spacing during pneumatically assisted sowing, particularly for large grains like corn and cereals, leading to variations in grain distribution that hinder precise sowing.
Innovation Solution
A method and device that utilize an air flow to guide granular material through a dosing unit with a curved outlet line, where the air flow is accelerated, ensuring grains are conveyed equidistantly and without collisions, by using a rotating conveyor or serrated disc to enhance kinetic energy and maintain uniform spacing, and a tapered outlet line to further refine grain distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional seed drills use pneumatic sowing for large grains like corn and cereals, then the sowing process can be automated and efficient, but the grain spacing becomes non-uniform with excessive variation
Solution Approach 1:
The seed flow is divided into individual grain portions using a dosing disc with equally spaced openings. Each opening allows one grain to pass through at a time, separating the continuous grain flow into discrete, equidistant portions that are then conveyed to the planting position.
Solution Approach 2:
The dosing disc rotates periodically, presenting its openings to the grain flow at regular intervals. This periodic rotation creates consistent time intervals between grain discharge, ensuring uniform spacing. The rotational motion is synchronized with the conveyance system to maintain equidistant grain placement.
2Speed
If grains are conveyed through straight lines with high velocity, then the sowing speed increases, but collisions and turbulence occur disrupting uniform spacing
Solution Approach 1:
The outlet line is designed with a curved path rather than a straight line. This curvature allows grains to follow a smooth trajectory, reducing abrupt changes in direction that cause collisions. The curved path also helps maintain laminar flow characteristics, minimizing turbulence while preserving conveyance speed.
Solution Approach 2:
The system changes the flow parameters by reducing grain velocity in the curved outlet section compared to the straight feed line. This velocity reduction occurs naturally through the curved path and is designed to prevent collisions while maintaining sufficient speed for efficient sowing. The parameter change is spatial, with different sections having different optimal velocities.
3Device complexity
If the outlet line is straight and short, then the device complexity is reduced, but grain spacing uniformity cannot be maintained
Solution Approach 1:
The outlet line incorporates a curved path that is integrated into the compact dosing unit design. This curvature is achieved through careful geometric design of the housing and flow channels, adding functional complexity for grain spacing control while minimizing overall device size and component count.
Solution Approach 2:
The curved outlet line is merged with the dosing disc assembly into a single integrated unit. The outlet channel is formed as part of the housing structure surrounding the dosing disc, eliminating the need for separate straight and curved sections. This merging reduces the number of discrete components while maintaining the necessary curved path for uniform grain discharge.
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 approach ensures largely collision-free and turbulence-free grain conveyance, achieving uniform grain spacing and precise longitudinal distribution, effectively approximating single-grain sowing even for larger grains like corn and cereals.
Implementation Method 1
The granular material, carried and transported by an airflow, is fed through a feed line into a metering unit
Implementation Method 2
The granular material is guided in an approximately arc-shaped path... The granular material, metered and transported approximately equidistantly and/or uniformly in an outer region of the curved outlet line
Data Source
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AI summary
The invention relates to a method for metering granular material such as seeds, fertilizer or the like, in particular within a spreading or sowing assembly of a spreading or sowing machine (10), and to a corresponding metering device (34). According to the method, the granular material, which is borne and conveyed by an air stream (26) and/or by the kinetic energy of the material, is conducted through a feed line (38) into a metering assembly (40), guided there in an approximately arc-shaped profile and conducted tangentially into an output line (44, 50), which is connected to the metering assembly (40) and is slightly curved in profile, at least in some sections. The granular material that is conveyed and metered virtually equidistantly and/or uniformly in an outer region (56) of the curved output line (44, 50) is borne by the discharged air stream (46), at least some of which exits the metering assembly (40) through the output line (44, 50).