Vegetation Cutting Grapple with Dual-Axis Pivot
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Solution Overview
Problem
Existing systems for felling trees and brush, such as those described in European Pat. No. EP2014154, are inadequate for efficiently clearing invasive small-caliper vegetation like Scotch Broom without damaging the surrounding environment or using chemical herbicides.
Innovation Solution
A vegetation clearing system comprising a grapple with pivotally mounted capture jaws, a power-driven shear blade, and a support frame attachable to a tractor, allowing for pivoting and rotation to effectively grasp and cut small-caliper vegetation, with a hydraulic actuation system for efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing tree felling apparatus is used, then large trees can be felled, but small-caliper invasive vegetation cannot be efficiently cleared
Solution Approach 1:
The cutting element is changed from a saw blade designed for large trees to a shear blade with cutting edges specifically configured for small-caliper vegetation. The shear blade has curved cutting edges that intersect at the pivot point, creating a scissoring action optimized for vegetation up to 4 inches in diameter, thereby improving clearing efficiency for invasive species while maintaining adaptability through the adjustable grapple system.
Solution Approach 2:
The grapple assembly is divided into multiple capture jaws that can be independently positioned and adjusted. This segmentation allows the grapple to adapt to different vegetation sizes and configurations, enabling efficient grasping of small-caliper invasive plants while maintaining the capability to handle larger vegetation, thus resolving the contradiction between productivity for small vegetation and adaptability to various sizes.
2Productivity
If chemical herbicides are used to control invasive species, then vegetation clearing is effective, but environmental damage occurs
Solution Approach 1:
The system replaces chemical herbicides with a mechanical cutting system. The power-driven shear blade physically severs the vegetation through a scissoring action between curved cutting edges, achieving effective vegetation clearing without introducing harmful chemicals into the environment. This mechanical substitution eliminates the harmful factors associated with chemical herbicides while maintaining high productivity in clearing invasive species.
3Ease of operation
If a fixed grapple design is used, then结构简单 (structure is simple), but it cannot effectively grasp and position small-caliper vegetation for cutting
Solution Approach 1:
The grapple assembly incorporates movable capture jaws with adjustable positions along the frame, allowing dynamic adaptation to different vegetation sizes and shapes. The capture jaws can be independently positioned to effectively grasp small-caliper vegetation, and the entire grapple assembly can be rotated and positioned by the rotator mechanism. This dynamic design improves ease of operation for grasping and positioning vegetation while maintaining reasonable structural complexity through the use of standardized hydraulic actuation 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
Enables efficient cutting of small-caliper vegetation up to 4 inches in diameter and trimming of branches up to 15 feet high, reducing environmental impact while avoiding chemical herbicides, and can be used in sensitive areas like gardens.
Implementation Method 1
a movable capture jaw connected to a hydraulic actuator for moving the movable capture jaw between a retracted position, in which the movable capture jaw is spaced apart from the stationary capture jaw, and a closed position in which the movable capture jaw engages the stationary capture jaw
Implementation Method 2
a shear blade having cutting edges that intersect at a pivot point of the shear blade
Data Source
AI summary
A vegetation clearing device relating to the clearing of small-caliper vegetation, the vegetation clearing device having a grapple configured to releasably grapple the small-caliper vegetation, a cutter configured to cut the small-caliper vegetation engaged within the grapple, a support frame configured to support the grapple and the cutter, a coupler configured to removably couple the support frame to a working arm of a tractor, the coupler having a first pivot enabling pivoting of the support frame about a first rotational axis and a second pivot enabling pivoting of the support frame about a second rotational axis, the second rotational axis being non-parallel with the first rotational axis, a power-driven grapple actuator configured to actuate the releasable grappling by the grapple, and a power-driven rotator configured to rotate the support frame about the second rotational axis.