Debranching Machine with Offset Blades and Friction Drive
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Solution Overview
Problem
Existing debranching apparatuses for living trees are complex, prone to failure, expensive, and can damage tree bark, limiting their effectiveness and year-round use due to reliance on drive chains or hydraulic systems that apply pressure on the bark, which disrupts sap flow and requires precise alignment.
Innovation Solution
A debranching apparatus with a lower and upper cutting apparatus, featuring offset blades that move in stages to cover the tree trunk's circumference, reducing the need for high-powered drives and allowing horizontal mobility to adapt to trunk deviations, while using a single hydraulic motor and pivoting support wheel to minimize weight and pressure on the bark.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If drive chains or hydraulic systems are used to move the apparatus up the tree trunk, then the apparatus can travel upward on its own, but the pressure applied on the tree bark damages the bark and interrupts sap flow
Solution Approach 1:
The patent introduces a support wheel as an intermediary element that contacts the tree trunk instead of using drive chains or hydraulic systems that directly apply pressure. The support wheel is driven by a hydraulic motor but transfers motion through friction rather than direct pressure, eliminating bark damage while maintaining self-propelled capability
Solution Approach 2:
The patent replaces the traditional mechanical drive chain system with a hydraulic motor-driven support wheel system. This substitution eliminates the need for chains that wrap around and pressure the bark, using instead a wheel that rolls along the trunk surface, thereby preventing bark damage while achieving self-propelled movement
2Productivity
If three separate circular saws with individual drive motors are used, then all branches can be removed effectively, but the apparatus becomes complicated and susceptible to failure
Solution Approach 1:
The patent merges three separate circular saws with individual drive motors into a single circular saw driven by a single drive motor. The saw unit is designed with a oscillating mechanism that allows the single saw to cover the entire circumference of the tree trunk, thereby reducing complexity while maintaining branch removal effectiveness
Solution Approach 2:
The single circular saw is designed to perform multiple functions by oscillating horizontally to cut branches at different positions around the trunk circumference. This universal design allows one saw unit to replace three separate saw units, reducing the number of components while maintaining comprehensive branch removal capability
3Productivity
If the circular saws oscillate in the horizontal direction to capture all branches, then complete branch removal is achieved, but the speed of apparatus movement up the tree trunk is limited
Solution Approach 1:
The patent implements a dynamic oscillating mechanism for the circular saw that can adjust its horizontal movement range. The oscillation is synchronized with the upward movement of the apparatus, allowing the saw to cover the entire trunk circumference at each level while the apparatus moves continuously upward without speed limitation. The dynamic adjustment of oscillation amplitude and frequency optimizes both completeness of branch removal and movement speed
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 apparatus enables efficient, year-round debranching with reduced risk of bark damage, improved mobility, and lower operational costs, allowing for faster and more effective branch removal without interrupting sap flow.
Implementation Method 1
having a support wheel which can be pressed with pressure against a tree trunk in its working position, by means of which the basic body can be driven up and down on the tree
Implementation Method 2
two belt drives attached to the basic body at a distance and parallel, which are pressed against the tree trunk with pressure
Data Source
AI summary
A machine for debranching living trees can move up and down the tree autonomously via a drive mechanism and has an upper cutting unit including three blades and below it a lower cutting unit including two blades. The in total five blades are arranged so that they cover the full girth of the tree. The two blades in the lower cutting unit are horizontally offset so that their end portions can overlap. To move the machine along the tree trunk there are two belt drives which press against the tree and are both driven by a single hydraulic motor. The upper cutting unit with its three blades can move horizontally as a whole, so that when the machine is moved and encounters thicker or slightly bent parts of the tree trunk it can give way in order to prevent the bark from being damaged by the blades.