Seed Metering Device Supported on Press Wheel for Sowing Accuracy
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Solution Overview
Problem
Existing seed drills face challenges in achieving precise seed placement due to relative movements between the seed separating device and the seed coulter, leading to inaccurate seed distribution and defects in the seed row, as well as exposure to shocks and impacts that affect the separation quality.
Innovation Solution
The pressure roller is connected via link arms to the machine frame and/or frame parts of the furrow opener, allowing it to move independently of the furrow opener, while the seed separating device is partially or completely supported on the pressure roller, reducing shock transmission and enabling precise height adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the seed singulation device is rigidly connected to the machine frame, then the seed singulation device remains stable and shock-free, but the conveyor lines must be very long to compensate for movements between drilling units and the seed singulation device
Solution Approach 1:
The patent combines the seed singulation device with the drilling unit assembly, specifically supporting it on the pressure roller. This merging eliminates the need for long conveyor lines by placing the singulation device directly at the deposition zone, while the pressure roller's independent vertical movement isolates the singulation device from ground shocks.
2Length of moving object
If the seed singulation device is rigidly connected to the drilling unit, then the conveyor line can be made shorter, but the seed singulation device is subjected to constant shocks and impacts from vertical movements
Solution Approach 1:
The patent segments the vertical movement isolation by allowing the pressure roller to move independently relative to the furrow opener through guide arms. The seed singulation device is attached to the pressure roller, creating a separate movement zone that is isolated from the shocks experienced by the furrow opener during ground following.
Solution Approach 2:
The pressure roller acts as an intermediary between the furrow opener and the seed singulation device. It provides a stable mounting platform for the singulation device while its independent vertical movement absorbs and isolates the device from ground-induced shocks and impacts.
3Stability of the object's composition
If the coulter and seed singulation device are firmly coupled, then they move together during vertical movements, but shocks are transmitted to the seed singulation device impairing singulation quality
Solution Approach 1:
The patent introduces dynamic independence by allowing the pressure roller (and thus the seed singulation device) to move vertically independently of the furrow opener through guide arms. This dynamic separation maintains the spatial relationship needed for accurate seed placement while preventing shock transmission that would occur with rigid coupling.
4Manufacturing precision
If the seed singulation device is supported on the pressure roller with independent vertical movement, then shock transmission is reduced and placement accuracy is improved, but the device complexity increases
Solution Approach 1:
The guide arms serve as simple intermediary mechanical elements that provide the pressure roller with independent vertical movement capability. This straightforward mechanical linkage achieves shock isolation and placement accuracy improvement without introducing complex control systems or multiple actuating mechanisms.
Data Source
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AI summary
The invention relates to an agricultural sowing machine (2) with a machine frame (4), a plurality of seed metering devices (6), which are arranged next to one another on the machine frame, and drill units (8). The drill units have at least one furrow opener (10), a conveyor line (14) for conveying the seed from the seed metering device to a depositing zone (30) with a dispensing opening (16) arranged near the ground, and a press wheel (12), and the at least one furrow opener, the dispensing opening, and the press wheel are arranged in the drill unit in said operational sequence relative to one another.