Sowing Machine Rocker Linkage for Opening Disc Depth Control
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Solution Overview
Problem
Existing seed drills face challenges in controlling the depth of the opening disc, which is affected by soil conditions and obstructions like vegetation or stones, often requiring complex and expensive mechanisms for adjustment.
Innovation Solution
A seeder design incorporating a rocker mechanism that interacts mechanically between the opening disc and closing wheel, allowing for adjustable moments of force and alignment, ensuring the disc maintains depth control and stability even in the presence of obstructions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a complex adjustment mechanism is used to control the depth of the opening disc, then the depth control precision is improved, but the device complexity increases
Solution Approach 1:
The patent introduces a rocker as an intermediary mechanical element that mediates between the opening disc and closing wheel. This rocker acts as a simple lever mechanism that automatically adjusts and maintains the depth of the opening disc without requiring complex control systems, thereby achieving precise depth control while keeping the device structure simple
Solution Approach 2:
The rocker mechanism enables the opening disc to self-adjust its depth automatically through mechanical interaction with the closing wheel. The system uses the natural reaction forces from the ground and the mechanical coupling through the rocker to maintain consistent depth without external control systems or complex adjustment mechanisms
2Measurement precision
If the opening disc encounters vegetation or stones, then the depth control is improved through mechanical feedback, but the reliability decreases due to uncontrolled depth variations
Solution Approach 1:
The rocker creates a mechanical feedback loop between the opening disc and closing wheel. When the opening disc encounters obstacles like vegetation or stones and attempts to change depth, the rocker transmits this movement as a counteracting force through the mechanical linkage, automatically restoring the intended depth relationship between the two components
Solution Approach 2:
The mechanical coupling through the rocker provides a cushioning effect that anticipates and compensates for depth variations caused by obstacles. The system is designed so that the mechanical linkage itself absorbs and compensates for sudden depth changes, preventing uncontrolled variations before they can significantly affect performance
3Device complexity
If a simple rocker mechanism is used instead of complex adjustment means, then the device complexity is reduced, but the manufacturing precision may worsen
Solution Approach 1:
The rocker is designed with asymmetric geometry where the distances from the pivot point to the opening disc attachment point and to the closing wheel attachment point are deliberately different. This asymmetric design creates the necessary mechanical leverage to maintain proper alignment and depth control while keeping the structure simple and easy to manufacture
Solution Approach 2:
The patent specifies particular parameter ranges for the rocker dimensions (distances between pivot points, attachment positions) to ensure proper alignment and functionality. By optimizing these geometric parameters within specific ranges, the system achieves reliable alignment performance using a simple mechanical structure that is easy to manufacture
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 rocker mechanism provides effective depth control of the opening disc without complex means, enhancing precision and adaptability to varying soil conditions and obstructions, while maintaining alignment and reducing operational complexity.
Implementation Method 1
the moment of force, about the axis B, of the opening disc and/or the moment of force, about the axis B, of the closing wheel is/are adjustable
Implementation Method 2
the rocker ensures a mechanical interaction between the opening disc and the closing wheel: if one of these two parts lifts, for example when a stone passes over it, the reaction of the ground on the other part tends to bring it back towards the ground
Implementation Method 3
Conversely, if the opening disc sinks into the ground, the weight of the closing wheel tends to extract it, the rocker thus limiting this sinking
Data Source
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AI summary
Seeder comprising a support (12) intended, in a service position, to be towed by an agricultural machine in a direction of advance (A), the seeder comprising: - an opening disc (14) mounted for rotation, on the support, around an opening disc pivot of axis O, so as to create a slit in the soil; - a seeder drop (18) rigidly fixed on the support and configured to, in the service position, deposit a compound in the slit;- a closing wheel (20) mounted for rotation on the support around a closing wheel pivot of axis F, so as to close, at least partially, the slot in which the compound has been deposited, the seeder being characterized in that the support comprises - a fixing base (22) to the agricultural machine, and - a rocker (24) mounted for rotation on the base (22) around a rocker pivot of axis B, the axes O, F and B1 in respective transverse planes perpendicular to the direction of advancement (A) of the seeder, the transverse plane P in which the axis B extends separating the opening disc pivot and the closing wheel pivot, the opening disc (14), the seeder chute (18) and the closing wheel (20) being successively mounted, from front to back, on the support.;