Agricultural Marker Assembly Rigid Link Cam Deployment
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Solution Overview
Problem
Agricultural seeders require a marker assembly that can be precisely controlled for deployment from a retracted position to an extended working position, while also accommodating variations in ground contours and allowing for easy transport and storage, as improper uniformity in seeding can negatively impact crop yields.
Innovation Solution
A marker assembly with interconnected frame sections that can be pivoted for retraction, featuring a support wheel controlled by a rigid link and cam assembly for precise deployment and a caster wheel for accommodating ground contours, allowing for controlled extension and retraction, and a spring link for rapid deployment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the marker assembly is made foldable or collapsible for transport and storage, then ease of transport and storage is improved, but precise control of deployment from retracted to extended position deteriorates
Solution Approach 1:
The marker assembly employs a dynamic deployment mechanism where frame sections are pivoted relative to each other through a controlled motion sequence. The cam assembly converts rotational motion of the rigid link into precise angular displacement of frame sections, enabling the structure to transition smoothly between folded and extended positions with accurate positioning control.
Solution Approach 2:
The cam assembly acts as an intermediary mechanism between the rigid link and the frame sections. It mediates the force transmission and motion control, ensuring that the deployment occurs in a controlled manner with precise angular positioning of each frame section relative to others, thereby resolving the contradiction between foldability and deployment precision.
2Manufacturing precision
If the rigid link pulls down on the lever arm to force frame sections apart during deployment, then deployment control is improved, but the complexity of the mechanism increases
Solution Approach 1:
The cam assembly utilizes a curved cam surface that converts the linear pull of the rigid link into controlled rotational motion of the lever arm and frame sections. This curved geometry provides progressive force application and precise angular control, achieving deployment control through geometric design rather than complex mechanical linkages.
Solution Approach 2:
The cam profile is designed with specific geometric parameters that control the deployment sequence. By changing the cam surface geometry, the angular displacement, force distribution, and timing of frame section separation can be precisely controlled, achieving accurate deployment control through parameter optimization rather than increased mechanical 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
Enables precise and flexible deployment of the marker assembly, accommodating ground contours and facilitating easy transport and storage, thereby improving seeding uniformity and reducing the risk of damage from obstructions.
Implementation Method 1
The amount the second frame section pulls away from the first frame section is determined by the cam assembly
Implementation Method 2
The rigid link is operative to pull down on the lever arm when the marker assembly is being deployed so as to force the second frame section away from the first frame section
Implementation Method 3
The marker assembly has a support wheel that supports the marker assembly above the ground as the marker assembly is being deployed and when in an extended working position
Data Source
AI summary
A marker assembly mountable to an agricultural implement includes a set of interconnected frame sections that can be pivoted with respect to one another to retract the marker assembly for transport and/or storage. The marker assembly has a support wheel that supports the marker assembly above the ground as the marker assembly is being deployed and when in an extended working position. The point at which the support wheel engages the ground is controlled by a rigid link and cam assembly. The rigid link has a first end connected to a first frame section and a second end connected to a lever arm that is connected to a link of a second frame section. The rigid link is operative to pull down on the lever arm when the marker assembly is being deployed so as to force the second frame section away from the first frame section. The amount the second frame section pulls away from the first frame section is determined by the cam assembly.