Root Ball Digging Tool with Linear and Arcuate Cutting Paths
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Solution Overview
Problem
Mechanizing the process of digging root balls of desired size and shape for tree transplantation is challenging due to space restrictions in nurseries and canopy height limitations, which hinder the ability to generate sufficient downforce for a clean root cut.
Innovation Solution
A digging tool with a frame and two cutting members that move along different paths – one linear and one arcuate – to form a root ball of specific dimensions, allowing for efficient root extraction and transplantation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If traditional digging machines are used to extract root balls, then the root ball can be obtained, but the machine size is restricted by close quarters in nurseries and canopy height limitations, reducing downforce capability
Solution Approach 1:
The digging tool is divided into multiple independent arms (first arm, second arm, third arm) that can be positioned and controlled separately. Each arm carries cutting members that work in coordination, allowing the system to generate sufficient downforce through distributed mechanical advantage while maintaining a compact overall structure that fits within nursery space constraints
Solution Approach 2:
The digging tool employs a nested configuration where the third arm is positioned within the structure formed by the first and second arms. The cutting members are nested within the arm structures, and the entire digging mechanism can be collapsed or retracted into a compact form when not in use, enabling operation in confined nursery spaces while maintaining full functionality
2Manufacturing precision
If traditional single cutting mechanism is used, then the structure is simple, but the ability to produce root balls of desired size and shape is limited
Solution Approach 1:
Different cutting members are positioned at specific locations on different arms to address specific shaping requirements. The first cutting member on the first arm, the second cutting member on the second arm, and the third cutting member on the third arm each perform localized cutting functions that collectively produce the desired root ball geometry with high precision
Solution Approach 2:
The arrangement of multiple arms and cutting members is designed to naturally form a spherical or spheroidal root ball shape. The curved paths of the cutting members as they move through the soil create a rounded, compact root ball that maximizes volume efficiency and minimizes root damage, achieving precise shape control through geometric design rather than complex active control
3Force
If machinery operates under canopy height limitations, then space is utilized efficiently, but the downforce required for clean root cuts cannot be generated
Solution Approach 1:
The digging tool utilizes hydraulic actuators to power the movement of the arms and cutting members. Hydraulic systems provide high force density, enabling the generation of sufficient downforce and cutting force within the compact space constraints of the nursery environment. The hydraulic pressure can be dynamically adjusted to optimize cutting force while maintaining a small machine footprint
Data Source
AI summary
Embodiments relate to a tool for digging root balls of trees. The digging tool uses at least two cutting members that move in different paths for digging through the soil and cutting through a portion of the tree's roots. One cutting member moves along a substantially linear-path thereby forming a portion of a side wall of the root ball. The other cutting member moves along an arcuate path for forming a lower wall of the root ball. When the root ball is formed, the tool can be used to remove the root ball and the tree from a first location and move the tree to a second location. The size of the cutting members can be selected to form a root ball of a desired shape and size to allow the tree to continue growing at the second location.