Agricultural Down-Pressure Adjusting Mechanism
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Solution Overview
Problem
Existing agricultural machinery systems for adjusting down-pressure on working elements, such as seeders and fertilizer distribution machines, are cumbersome, require high manual effort, and often disengage due to limited pressure control, making it difficult to maintain consistent seed depth and efficient operation.
Innovation Solution
A deformable connecting structure with a movable mechanism and a resilient member, featuring a lever and a second axis, allows for automatic locking and easy adjustment of down-pressure, reducing manual effort and ensuring consistent pressure application without disengagement, utilizing a helical spring and adjustable stop mechanism for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a traditional adjusting system with springs and racks is used, then down-pressure can be applied to the working element, but the system requires high manual effort and is cumbersome to operate
Solution Approach 1:
The patent introduces a movable mechanism that can dynamically switch between an engaged state (applying down-pressure) and an adjusting state (allowing easy repositioning). The lever mounted rotatably on the resilient member enables the operator to easily move the mechanism along the beam, reducing manual effort while maintaining effective down-pressure application when engaged.
Solution Approach 2:
The resilient member (spring) acts as an intermediary between the lever and the beam, providing automatic locking when engaged and easy release when adjusting. This intermediary mechanism reduces the manual effort required to operate the system while maintaining the necessary down-pressure force.
2Force
If the handle is brought closer to the front of the machine to decrease down-pressure, then lower pressure is applied, but the system risks disengaging due to insufficient locking force
Solution Approach 1:
The resilient member provides continuous feedback through its elastic properties, automatically adjusting the locking force based on the position of the lever. When the lever is in the engaged state, the spring maintains sufficient locking force to prevent disengagement, even at lower down-pressure settings, by dynamically adjusting to the applied loads.
Solution Approach 2:
The system changes the operational parameters of the resilient member based on the lever position. In the engaged state, the spring is compressed to provide maximum locking force and down-pressure. In the adjusting state, the spring extends to allow easy movement. This parameter change ensures reliable locking across all down-pressure settings.
3Force
If a slide with side pins and housings is used for adjustment, then down-pressure can be adjusted, but the springs greatly oppose the movement making adjusting tedious
Solution Approach 1:
The movable mechanism mounted on the beam allows the lever to move freely along the beam length in the adjusting state. The resilient member is positioned to oppose movement only when the lever is being engaged or disengaged, not during normal adjustment, making the adjusting process simple and quick while maintaining effective down-pressure control.
4Device complexity
If a non-tilting handle directly mounted on pressure springs is used, then the structure is simple, but the system offers limited down-pressure since the user must offset the force directly by adjustment
Solution Approach 1:
The patent adds a spatial dimension by mounting the lever rotatably on the resilient member rather than directly on the pressure springs. This dimensional change allows the lever to pivot and engage with the beam at optimal angles, multiplying the down-pressure force through mechanical advantage while maintaining structural simplicity. The lever's rotational degree of freedom enables force multiplication without complex mechanisms.
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 system provides a simple, cost-effective, and user-friendly method for adjusting down-pressure, ensuring consistent seed depth and efficient operation with reduced manual effort, while maintaining significant pressure on the working element, thereby improving the overall performance of agricultural machinery.
Implementation Method 1
a resilient member (38), in this case a helical spring
Implementation Method 2
the lever (37) being mounted rotatably relative to the resilient member (38) about a first axis (61)
Implementation Method 3
The movable mechanism comprises a second axis (62) different from the first axis (61), and in which the movable mechanism allows an intermediate state in which the lever (37) is rotatable about the second axis (62)
Data Source
AI summary
A working element is mounted on an agricultural machine having a deformable connecting structure including upper arms and lower arms. The connecting structure includes a system for adjusting the down-pressure having a movable mechanism and a reference member. The mechanism includes a lever and a resilient member that are articulated about a first axis. The mechanism allows an engaged state in which it is held against the reference member in a working position, subjecting the working element to a down-pressure, and an adjusting state in which it is movable about a lower axis with respect to the reference member. The mechanism includes a second axis about which the lever is pivotable in an intermediate state.