Retractable Spray Shield Quadrilateral Linkage
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Solution Overview
Problem
Current agricultural spray shields are ineffective in reducing overspray at field edges while maintaining efficient spraying in the middle of the field, as they are either too large and prone to damage or require adjustments for different crop species and heights, and fail to handle angled sprays effectively.
Innovation Solution
A retractable spray shield with a flaccid liquid barrier film and a deployment mechanism that includes a motor-driven clam-shell storage tube and quadrilateral linkage, allowing the shield to be easily deployed and concealed, thus blocking overspray at field edges without interfering with central spraying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a fixed spray shield is used to block overspray at field edges, then overspray reduction is achieved, but the shield interferes with spray distribution in the middle of the field and requires adjustment for different crop heights
Solution Approach 1:
The spray shield is made retractable and movable rather than fixed, allowing it to be positioned only when needed at field edges. The shield can be retracted or removed when spraying in the middle of the field, eliminating interference with spray distribution. This dynamic positioning resolves the contradiction by making the shield adaptive to different operating conditions without requiring mechanical adjustments for crop height.
Solution Approach 2:
The spray shield system is divided into separate modular components that can be independently deployed or removed. The shield segments can be attached only to boom arms at field edge locations, leaving central boom arms free for unrestricted spray distribution. This segmentation allows selective application of overspray protection only where needed.
2Object-affected harmful factors
If a large fixed spray shield is used to cover the entire field width, then overspray is reduced, but the shield is prone to damage and requires complex installation
Solution Approach 1:
Instead of one large fixed shield spanning the entire field width, the system uses multiple smaller shield segments that can be independently attached to individual boom arms. These smaller segments are less prone to damage from wind, crop contact, and mechanical stress. The segmented design also simplifies installation and removal compared to a single large shield structure.
Solution Approach 2:
The shield segments are designed to be movable and retractable rather than rigidly fixed, allowing them to flex and adapt to field conditions without breaking. The dynamic design enables the shields to move with the boom arms and adjust to varying crop heights, reducing the risk of damage from impact or stress.
3Object-affected harmful factors
If spray shields are deployed for all boom arms, then overspray is minimized, but the complexity of deployment and concealment increases
Solution Approach 1:
The spray shield system is segmented and attached only to boom arms that operate at field edges, rather than deploying shields on all boom arms. This selective deployment reduces the overall complexity of the deployment mechanism while still achieving effective overspray reduction at the locations where it is most needed.
Solution Approach 2:
The retractable shield mechanism is designed with universal mounting capabilities that can be adapted to different boom arm configurations and positions. The same basic deployment mechanism can serve multiple boom arms at different locations, reducing the need for custom-designed complex mechanisms for each individual boom arm.
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 retractable spray shield effectively reduces overspray at field edges while allowing efficient spraying in the middle, accommodating various crop heights and angles of spray, and can be easily installed on existing boom arms without the need for mechanical adjustments.
Implementation Method 1
a tension spring wrapped about the spring guide post configured to operatively stretch the pair of framing legs apart from each other and thereby expand the spray shield toward a planar, generally triangular geometry
Implementation Method 2
A spray barrier has a generally triangular and flaccid liquid barrier film
Data Source
AI summary
A retractable spray shield for agricultural use has a spray barrier; a clam-shell storage tube; a deployment and concealment drive having a motor, a drive shaft, and a quadrilateral linkage that in one direction deploys the spray barrier from the storage tube and in a second opposed direction conceals the spray barrier within the clam-shell storage tube. The quadrilateral linkage is defined by a rotating arm; a pushing arm coupled to the drive shaft; the bottom of the claim-shell storage tube, and a hinge plate supporting the spray barrier. The spray barrier has a generally triangular and flaccid liquid barrier film, a pair of framing legs coupled to opposed edges of the liquid barrier film, and a spring configured to operatively stretch the pair of framing legs apart from each other and thereby expand the barrier film toward a planar, generally triangular geometry when deployed.