Airborne Grapple Saw System for Vegetation Control
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Solution Overview
Problem
Existing airborne topping saw systems for vegetation management along powerline rights of way are inefficient and risky, as they rely on high-rpm spinning blades with limited control, potentially causing vegetation to hang in adjacent tree canopies or fall onto powerlines.
Innovation Solution
The development of an airborne grapple saw system suspended from a manned or unmanned aerial vehicle, equipped with a grapple saw head assembly that securely grasps vegetation using grapple arms and cuts it using a chainsaw, while maintaining control and safety by rotating about a vertical axis and using a wireless control system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a high-rpm spinning blade is used for cutting vegetation from the air, then cutting speed is improved, but control over the cut vegetation is lost, causing it to hang in tree canopies or fall onto powerlines
Solution Approach 1:
The patent combines the cutting function (chainsaw) with the grapple function into a single integrated assembly. The grapple arms and chainsaw are mounted together on the airborne platform, allowing the operator to cut and immediately secure the vegetation in one positioned location, eliminating the loss of control that occurs when cutting and removal are separate operations
Solution Approach 2:
The grapple arms serve as an intermediary mechanism between the cutting action and the vegetation disposal. After the chainsaw cuts the vegetation, the grapple arms immediately grasp and control the cut material, preventing it from hanging in canopies or falling onto powerlines before transporting it to a safe location
2Reliability
If vegetation is cut down completely from the ground, then safety is improved by avoiding tree toppling onto powerlines, but the risk remains that the tree may still fall onto the powerline during the cutting process
Solution Approach 1:
The grapple arms are positioned and ready to immediately secure the vegetation as soon as the cut is made. This preliminary positioning of the grapple mechanism ensures that control is established at the moment of cutting, preventing the tree from falling onto powerlines during the operation
Solution Approach 2:
The grapple arms act as an intermediary that takes control of the cut vegetation immediately after cutting, preventing uncontrolled falling onto powerlines while maintaining safety
3Productivity
If traditional airborne topping saw systems are used, then cutting capability is provided, but additional labor and equipment are required for vegetation removal
Solution Approach 1:
The airborne platform is designed with multi-functionality, combining cutting (chainsaw) and grasping/transport (grapple arms) capabilities in one system. This eliminates the need for separate ground equipment and labor for vegetation removal, as the single airborne assembly performs both functions
Solution Approach 2:
The cutting and grasping functions are merged into a single integrated airborne assembly, eliminating the need for separate removal operations and reducing overall device complexity despite the advanced capabilities
Data Source
AI summary
An airborne grapple saw system includes a suspension assembly, a hydraulic power pack assembly, and a grapple saw head assembly. The suspension assembly is configured to be suspended from an aerial vehicle. The hydraulic power pack assembly is operatively coupled with the suspension assembly. The grapple saw head assembly is operatively coupled with the hydraulic power pack assembly. The grapple saw head assembly is configured to freely rotate about a vertical axis an unlimited number of revolutions. The grapple saw head assembly includes a saw and first and second grapple arms. The grapple arms are pivotable between an open configuration, where the grapple arms are configured to obtain and release the vegetation, and a closed configuration, where the grapple arms are configured to securely retain the vegetation.